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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 | ||
9f9b8e8d QW |
54 | /* |
55 | * Declare a helper function to detect underflow of various space info members | |
56 | */ | |
57 | #define DECLARE_SPACE_INFO_UPDATE(name) \ | |
58 | static inline void update_##name(struct btrfs_space_info *sinfo, \ | |
59 | s64 bytes) \ | |
60 | { \ | |
61 | if (bytes < 0 && sinfo->name < -bytes) { \ | |
62 | WARN_ON(1); \ | |
63 | sinfo->name = 0; \ | |
64 | return; \ | |
65 | } \ | |
66 | sinfo->name += bytes; \ | |
67 | } | |
68 | ||
69 | DECLARE_SPACE_INFO_UPDATE(bytes_may_use); | |
e2907c1a | 70 | DECLARE_SPACE_INFO_UPDATE(bytes_pinned); |
9f9b8e8d | 71 | |
5d4f98a2 | 72 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
e72cb923 NB |
73 | struct btrfs_delayed_ref_node *node, u64 parent, |
74 | u64 root_objectid, u64 owner_objectid, | |
75 | u64 owner_offset, int refs_to_drop, | |
76 | struct btrfs_delayed_extent_op *extra_op); | |
5d4f98a2 YZ |
77 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
78 | struct extent_buffer *leaf, | |
79 | struct btrfs_extent_item *ei); | |
80 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
5d4f98a2 YZ |
81 | u64 parent, u64 root_objectid, |
82 | u64 flags, u64 owner, u64 offset, | |
83 | struct btrfs_key *ins, int ref_mod); | |
84 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
4e6bd4e0 | 85 | struct btrfs_delayed_ref_node *node, |
21ebfbe7 | 86 | struct btrfs_delayed_extent_op *extent_op); |
01458828 | 87 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags, |
698d0082 | 88 | int force); |
11833d66 YZ |
89 | static int find_next_key(struct btrfs_path *path, int level, |
90 | struct btrfs_key *key); | |
ab8d0fc4 JM |
91 | static void dump_space_info(struct btrfs_fs_info *fs_info, |
92 | struct btrfs_space_info *info, u64 bytes, | |
9ed74f2d | 93 | int dump_block_groups); |
5d80366e JB |
94 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
95 | u64 num_bytes); | |
957780eb JB |
96 | static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info, |
97 | struct btrfs_space_info *space_info, | |
98 | u64 num_bytes); | |
99 | static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info, | |
100 | struct btrfs_space_info *space_info, | |
101 | u64 num_bytes); | |
6a63209f | 102 | |
817d52f8 JB |
103 | static noinline int |
104 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
105 | { | |
106 | smp_mb(); | |
36cce922 JB |
107 | return cache->cached == BTRFS_CACHE_FINISHED || |
108 | cache->cached == BTRFS_CACHE_ERROR; | |
817d52f8 JB |
109 | } |
110 | ||
0f9dd46c JB |
111 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
112 | { | |
113 | return (cache->flags & bits) == bits; | |
114 | } | |
115 | ||
758f2dfc | 116 | void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
117 | { |
118 | atomic_inc(&cache->count); | |
119 | } | |
120 | ||
121 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
122 | { | |
f0486c68 YZ |
123 | if (atomic_dec_and_test(&cache->count)) { |
124 | WARN_ON(cache->pinned > 0); | |
125 | WARN_ON(cache->reserved > 0); | |
0966a7b1 QW |
126 | |
127 | /* | |
128 | * If not empty, someone is still holding mutex of | |
129 | * full_stripe_lock, which can only be released by caller. | |
130 | * And it will definitely cause use-after-free when caller | |
131 | * tries to release full stripe lock. | |
132 | * | |
133 | * No better way to resolve, but only to warn. | |
134 | */ | |
135 | WARN_ON(!RB_EMPTY_ROOT(&cache->full_stripe_locks_root.root)); | |
34d52cb6 | 136 | kfree(cache->free_space_ctl); |
11dfe35a | 137 | kfree(cache); |
f0486c68 | 138 | } |
11dfe35a JB |
139 | } |
140 | ||
0f9dd46c JB |
141 | /* |
142 | * this adds the block group to the fs_info rb tree for the block group | |
143 | * cache | |
144 | */ | |
b2950863 | 145 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
146 | struct btrfs_block_group_cache *block_group) |
147 | { | |
148 | struct rb_node **p; | |
149 | struct rb_node *parent = NULL; | |
150 | struct btrfs_block_group_cache *cache; | |
151 | ||
152 | spin_lock(&info->block_group_cache_lock); | |
153 | p = &info->block_group_cache_tree.rb_node; | |
154 | ||
155 | while (*p) { | |
156 | parent = *p; | |
157 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
158 | cache_node); | |
159 | if (block_group->key.objectid < cache->key.objectid) { | |
160 | p = &(*p)->rb_left; | |
161 | } else if (block_group->key.objectid > cache->key.objectid) { | |
162 | p = &(*p)->rb_right; | |
163 | } else { | |
164 | spin_unlock(&info->block_group_cache_lock); | |
165 | return -EEXIST; | |
166 | } | |
167 | } | |
168 | ||
169 | rb_link_node(&block_group->cache_node, parent, p); | |
170 | rb_insert_color(&block_group->cache_node, | |
171 | &info->block_group_cache_tree); | |
a1897fdd LB |
172 | |
173 | if (info->first_logical_byte > block_group->key.objectid) | |
174 | info->first_logical_byte = block_group->key.objectid; | |
175 | ||
0f9dd46c JB |
176 | spin_unlock(&info->block_group_cache_lock); |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | /* | |
182 | * This will return the block group at or after bytenr if contains is 0, else | |
183 | * it will return the block group that contains the bytenr | |
184 | */ | |
185 | static struct btrfs_block_group_cache * | |
186 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
187 | int contains) | |
188 | { | |
189 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
190 | struct rb_node *n; | |
191 | u64 end, start; | |
192 | ||
193 | spin_lock(&info->block_group_cache_lock); | |
194 | n = info->block_group_cache_tree.rb_node; | |
195 | ||
196 | while (n) { | |
197 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
198 | cache_node); | |
199 | end = cache->key.objectid + cache->key.offset - 1; | |
200 | start = cache->key.objectid; | |
201 | ||
202 | if (bytenr < start) { | |
203 | if (!contains && (!ret || start < ret->key.objectid)) | |
204 | ret = cache; | |
205 | n = n->rb_left; | |
206 | } else if (bytenr > start) { | |
207 | if (contains && bytenr <= end) { | |
208 | ret = cache; | |
209 | break; | |
210 | } | |
211 | n = n->rb_right; | |
212 | } else { | |
213 | ret = cache; | |
214 | break; | |
215 | } | |
216 | } | |
a1897fdd | 217 | if (ret) { |
11dfe35a | 218 | btrfs_get_block_group(ret); |
a1897fdd LB |
219 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
220 | info->first_logical_byte = ret->key.objectid; | |
221 | } | |
0f9dd46c JB |
222 | spin_unlock(&info->block_group_cache_lock); |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
2ff7e61e | 227 | static int add_excluded_extent(struct btrfs_fs_info *fs_info, |
11833d66 | 228 | u64 start, u64 num_bytes) |
817d52f8 | 229 | { |
11833d66 | 230 | u64 end = start + num_bytes - 1; |
0b246afa | 231 | set_extent_bits(&fs_info->freed_extents[0], |
ceeb0ae7 | 232 | start, end, EXTENT_UPTODATE); |
0b246afa | 233 | set_extent_bits(&fs_info->freed_extents[1], |
ceeb0ae7 | 234 | start, end, EXTENT_UPTODATE); |
11833d66 YZ |
235 | return 0; |
236 | } | |
817d52f8 | 237 | |
9e715da8 | 238 | static void free_excluded_extents(struct btrfs_block_group_cache *cache) |
11833d66 | 239 | { |
9e715da8 | 240 | struct btrfs_fs_info *fs_info = cache->fs_info; |
11833d66 | 241 | u64 start, end; |
817d52f8 | 242 | |
11833d66 YZ |
243 | start = cache->key.objectid; |
244 | end = start + cache->key.offset - 1; | |
245 | ||
0b246afa | 246 | clear_extent_bits(&fs_info->freed_extents[0], |
91166212 | 247 | start, end, EXTENT_UPTODATE); |
0b246afa | 248 | clear_extent_bits(&fs_info->freed_extents[1], |
91166212 | 249 | start, end, EXTENT_UPTODATE); |
817d52f8 JB |
250 | } |
251 | ||
3c4da657 | 252 | static int exclude_super_stripes(struct btrfs_block_group_cache *cache) |
817d52f8 | 253 | { |
3c4da657 | 254 | struct btrfs_fs_info *fs_info = cache->fs_info; |
817d52f8 JB |
255 | u64 bytenr; |
256 | u64 *logical; | |
257 | int stripe_len; | |
258 | int i, nr, ret; | |
259 | ||
06b2331f YZ |
260 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
261 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
262 | cache->bytes_super += stripe_len; | |
2ff7e61e | 263 | ret = add_excluded_extent(fs_info, cache->key.objectid, |
06b2331f | 264 | stripe_len); |
835d974f JB |
265 | if (ret) |
266 | return ret; | |
06b2331f YZ |
267 | } |
268 | ||
817d52f8 JB |
269 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
270 | bytenr = btrfs_sb_offset(i); | |
0b246afa | 271 | ret = btrfs_rmap_block(fs_info, cache->key.objectid, |
63a9c7b9 | 272 | bytenr, &logical, &nr, &stripe_len); |
835d974f JB |
273 | if (ret) |
274 | return ret; | |
11833d66 | 275 | |
817d52f8 | 276 | while (nr--) { |
51bf5f0b JB |
277 | u64 start, len; |
278 | ||
279 | if (logical[nr] > cache->key.objectid + | |
280 | cache->key.offset) | |
281 | continue; | |
282 | ||
283 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
284 | continue; | |
285 | ||
286 | start = logical[nr]; | |
287 | if (start < cache->key.objectid) { | |
288 | start = cache->key.objectid; | |
289 | len = (logical[nr] + stripe_len) - start; | |
290 | } else { | |
291 | len = min_t(u64, stripe_len, | |
292 | cache->key.objectid + | |
293 | cache->key.offset - start); | |
294 | } | |
295 | ||
296 | cache->bytes_super += len; | |
2ff7e61e | 297 | ret = add_excluded_extent(fs_info, start, len); |
835d974f JB |
298 | if (ret) { |
299 | kfree(logical); | |
300 | return ret; | |
301 | } | |
817d52f8 | 302 | } |
11833d66 | 303 | |
817d52f8 JB |
304 | kfree(logical); |
305 | } | |
817d52f8 JB |
306 | return 0; |
307 | } | |
308 | ||
11833d66 YZ |
309 | static struct btrfs_caching_control * |
310 | get_caching_control(struct btrfs_block_group_cache *cache) | |
311 | { | |
312 | struct btrfs_caching_control *ctl; | |
313 | ||
314 | spin_lock(&cache->lock); | |
dde5abee JB |
315 | if (!cache->caching_ctl) { |
316 | spin_unlock(&cache->lock); | |
11833d66 YZ |
317 | return NULL; |
318 | } | |
319 | ||
320 | ctl = cache->caching_ctl; | |
1e4f4714 | 321 | refcount_inc(&ctl->count); |
11833d66 YZ |
322 | spin_unlock(&cache->lock); |
323 | return ctl; | |
324 | } | |
325 | ||
326 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
327 | { | |
1e4f4714 | 328 | if (refcount_dec_and_test(&ctl->count)) |
11833d66 YZ |
329 | kfree(ctl); |
330 | } | |
331 | ||
d0bd4560 | 332 | #ifdef CONFIG_BTRFS_DEBUG |
2ff7e61e | 333 | static void fragment_free_space(struct btrfs_block_group_cache *block_group) |
d0bd4560 | 334 | { |
2ff7e61e | 335 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
d0bd4560 JB |
336 | u64 start = block_group->key.objectid; |
337 | u64 len = block_group->key.offset; | |
338 | u64 chunk = block_group->flags & BTRFS_BLOCK_GROUP_METADATA ? | |
0b246afa | 339 | fs_info->nodesize : fs_info->sectorsize; |
d0bd4560 JB |
340 | u64 step = chunk << 1; |
341 | ||
342 | while (len > chunk) { | |
343 | btrfs_remove_free_space(block_group, start, chunk); | |
344 | start += step; | |
345 | if (len < step) | |
346 | len = 0; | |
347 | else | |
348 | len -= step; | |
349 | } | |
350 | } | |
351 | #endif | |
352 | ||
0f9dd46c JB |
353 | /* |
354 | * this is only called by cache_block_group, since we could have freed extents | |
355 | * we need to check the pinned_extents for any extents that can't be used yet | |
356 | * since their free space will be released as soon as the transaction commits. | |
357 | */ | |
a5ed9182 | 358 | u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
4457c1c7 | 359 | u64 start, u64 end) |
0f9dd46c | 360 | { |
4457c1c7 | 361 | struct btrfs_fs_info *info = block_group->fs_info; |
817d52f8 | 362 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
363 | int ret; |
364 | ||
365 | while (start < end) { | |
11833d66 | 366 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 367 | &extent_start, &extent_end, |
e6138876 JB |
368 | EXTENT_DIRTY | EXTENT_UPTODATE, |
369 | NULL); | |
0f9dd46c JB |
370 | if (ret) |
371 | break; | |
372 | ||
06b2331f | 373 | if (extent_start <= start) { |
0f9dd46c JB |
374 | start = extent_end + 1; |
375 | } else if (extent_start > start && extent_start < end) { | |
376 | size = extent_start - start; | |
817d52f8 | 377 | total_added += size; |
ea6a478e JB |
378 | ret = btrfs_add_free_space(block_group, start, |
379 | size); | |
79787eaa | 380 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
381 | start = extent_end + 1; |
382 | } else { | |
383 | break; | |
384 | } | |
385 | } | |
386 | ||
387 | if (start < end) { | |
388 | size = end - start; | |
817d52f8 | 389 | total_added += size; |
ea6a478e | 390 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 391 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
392 | } |
393 | ||
817d52f8 | 394 | return total_added; |
0f9dd46c JB |
395 | } |
396 | ||
73fa48b6 | 397 | static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl) |
e37c9e69 | 398 | { |
0b246afa JM |
399 | struct btrfs_block_group_cache *block_group = caching_ctl->block_group; |
400 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
401 | struct btrfs_root *extent_root = fs_info->extent_root; | |
e37c9e69 | 402 | struct btrfs_path *path; |
5f39d397 | 403 | struct extent_buffer *leaf; |
11833d66 | 404 | struct btrfs_key key; |
817d52f8 | 405 | u64 total_found = 0; |
11833d66 YZ |
406 | u64 last = 0; |
407 | u32 nritems; | |
73fa48b6 | 408 | int ret; |
d0bd4560 | 409 | bool wakeup = true; |
f510cfec | 410 | |
e37c9e69 CM |
411 | path = btrfs_alloc_path(); |
412 | if (!path) | |
73fa48b6 | 413 | return -ENOMEM; |
7d7d6068 | 414 | |
817d52f8 | 415 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 416 | |
d0bd4560 JB |
417 | #ifdef CONFIG_BTRFS_DEBUG |
418 | /* | |
419 | * If we're fragmenting we don't want to make anybody think we can | |
420 | * allocate from this block group until we've had a chance to fragment | |
421 | * the free space. | |
422 | */ | |
2ff7e61e | 423 | if (btrfs_should_fragment_free_space(block_group)) |
d0bd4560 JB |
424 | wakeup = false; |
425 | #endif | |
5cd57b2c | 426 | /* |
817d52f8 JB |
427 | * We don't want to deadlock with somebody trying to allocate a new |
428 | * extent for the extent root while also trying to search the extent | |
429 | * root to add free space. So we skip locking and search the commit | |
430 | * root, since its read-only | |
5cd57b2c CM |
431 | */ |
432 | path->skip_locking = 1; | |
817d52f8 | 433 | path->search_commit_root = 1; |
e4058b54 | 434 | path->reada = READA_FORWARD; |
817d52f8 | 435 | |
e4404d6e | 436 | key.objectid = last; |
e37c9e69 | 437 | key.offset = 0; |
11833d66 | 438 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 439 | |
52ee28d2 | 440 | next: |
11833d66 | 441 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 442 | if (ret < 0) |
73fa48b6 | 443 | goto out; |
a512bbf8 | 444 | |
11833d66 YZ |
445 | leaf = path->nodes[0]; |
446 | nritems = btrfs_header_nritems(leaf); | |
447 | ||
d397712b | 448 | while (1) { |
7841cb28 | 449 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 450 | last = (u64)-1; |
817d52f8 | 451 | break; |
f25784b3 | 452 | } |
817d52f8 | 453 | |
11833d66 YZ |
454 | if (path->slots[0] < nritems) { |
455 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
456 | } else { | |
457 | ret = find_next_key(path, 0, &key); | |
458 | if (ret) | |
e37c9e69 | 459 | break; |
817d52f8 | 460 | |
c9ea7b24 | 461 | if (need_resched() || |
9e351cc8 | 462 | rwsem_is_contended(&fs_info->commit_root_sem)) { |
d0bd4560 JB |
463 | if (wakeup) |
464 | caching_ctl->progress = last; | |
ff5714cc | 465 | btrfs_release_path(path); |
9e351cc8 | 466 | up_read(&fs_info->commit_root_sem); |
589d8ade | 467 | mutex_unlock(&caching_ctl->mutex); |
11833d66 | 468 | cond_resched(); |
73fa48b6 OS |
469 | mutex_lock(&caching_ctl->mutex); |
470 | down_read(&fs_info->commit_root_sem); | |
471 | goto next; | |
589d8ade | 472 | } |
0a3896d0 JB |
473 | |
474 | ret = btrfs_next_leaf(extent_root, path); | |
475 | if (ret < 0) | |
73fa48b6 | 476 | goto out; |
0a3896d0 JB |
477 | if (ret) |
478 | break; | |
589d8ade JB |
479 | leaf = path->nodes[0]; |
480 | nritems = btrfs_header_nritems(leaf); | |
481 | continue; | |
11833d66 | 482 | } |
817d52f8 | 483 | |
52ee28d2 LB |
484 | if (key.objectid < last) { |
485 | key.objectid = last; | |
486 | key.offset = 0; | |
487 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
488 | ||
d0bd4560 JB |
489 | if (wakeup) |
490 | caching_ctl->progress = last; | |
52ee28d2 LB |
491 | btrfs_release_path(path); |
492 | goto next; | |
493 | } | |
494 | ||
11833d66 YZ |
495 | if (key.objectid < block_group->key.objectid) { |
496 | path->slots[0]++; | |
817d52f8 | 497 | continue; |
e37c9e69 | 498 | } |
0f9dd46c | 499 | |
e37c9e69 | 500 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 501 | block_group->key.offset) |
e37c9e69 | 502 | break; |
7d7d6068 | 503 | |
3173a18f JB |
504 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
505 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
4457c1c7 | 506 | total_found += add_new_free_space(block_group, last, |
817d52f8 | 507 | key.objectid); |
3173a18f JB |
508 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
509 | last = key.objectid + | |
da17066c | 510 | fs_info->nodesize; |
3173a18f JB |
511 | else |
512 | last = key.objectid + key.offset; | |
817d52f8 | 513 | |
73fa48b6 | 514 | if (total_found > CACHING_CTL_WAKE_UP) { |
11833d66 | 515 | total_found = 0; |
d0bd4560 JB |
516 | if (wakeup) |
517 | wake_up(&caching_ctl->wait); | |
11833d66 | 518 | } |
817d52f8 | 519 | } |
e37c9e69 CM |
520 | path->slots[0]++; |
521 | } | |
817d52f8 | 522 | ret = 0; |
e37c9e69 | 523 | |
4457c1c7 | 524 | total_found += add_new_free_space(block_group, last, |
817d52f8 JB |
525 | block_group->key.objectid + |
526 | block_group->key.offset); | |
11833d66 | 527 | caching_ctl->progress = (u64)-1; |
817d52f8 | 528 | |
73fa48b6 OS |
529 | out: |
530 | btrfs_free_path(path); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | static noinline void caching_thread(struct btrfs_work *work) | |
535 | { | |
536 | struct btrfs_block_group_cache *block_group; | |
537 | struct btrfs_fs_info *fs_info; | |
538 | struct btrfs_caching_control *caching_ctl; | |
539 | int ret; | |
540 | ||
541 | caching_ctl = container_of(work, struct btrfs_caching_control, work); | |
542 | block_group = caching_ctl->block_group; | |
543 | fs_info = block_group->fs_info; | |
544 | ||
545 | mutex_lock(&caching_ctl->mutex); | |
546 | down_read(&fs_info->commit_root_sem); | |
547 | ||
1e144fb8 OS |
548 | if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) |
549 | ret = load_free_space_tree(caching_ctl); | |
550 | else | |
551 | ret = load_extent_tree_free(caching_ctl); | |
73fa48b6 | 552 | |
817d52f8 | 553 | spin_lock(&block_group->lock); |
11833d66 | 554 | block_group->caching_ctl = NULL; |
73fa48b6 | 555 | block_group->cached = ret ? BTRFS_CACHE_ERROR : BTRFS_CACHE_FINISHED; |
817d52f8 | 556 | spin_unlock(&block_group->lock); |
0f9dd46c | 557 | |
d0bd4560 | 558 | #ifdef CONFIG_BTRFS_DEBUG |
2ff7e61e | 559 | if (btrfs_should_fragment_free_space(block_group)) { |
d0bd4560 JB |
560 | u64 bytes_used; |
561 | ||
562 | spin_lock(&block_group->space_info->lock); | |
563 | spin_lock(&block_group->lock); | |
564 | bytes_used = block_group->key.offset - | |
565 | btrfs_block_group_used(&block_group->item); | |
566 | block_group->space_info->bytes_used += bytes_used >> 1; | |
567 | spin_unlock(&block_group->lock); | |
568 | spin_unlock(&block_group->space_info->lock); | |
2ff7e61e | 569 | fragment_free_space(block_group); |
d0bd4560 JB |
570 | } |
571 | #endif | |
572 | ||
573 | caching_ctl->progress = (u64)-1; | |
11833d66 | 574 | |
9e351cc8 | 575 | up_read(&fs_info->commit_root_sem); |
9e715da8 | 576 | free_excluded_extents(block_group); |
11833d66 | 577 | mutex_unlock(&caching_ctl->mutex); |
73fa48b6 | 578 | |
11833d66 YZ |
579 | wake_up(&caching_ctl->wait); |
580 | ||
581 | put_caching_control(caching_ctl); | |
11dfe35a | 582 | btrfs_put_block_group(block_group); |
817d52f8 JB |
583 | } |
584 | ||
9d66e233 | 585 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 586 | int load_cache_only) |
817d52f8 | 587 | { |
291c7d2f | 588 | DEFINE_WAIT(wait); |
11833d66 YZ |
589 | struct btrfs_fs_info *fs_info = cache->fs_info; |
590 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
591 | int ret = 0; |
592 | ||
291c7d2f | 593 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
594 | if (!caching_ctl) |
595 | return -ENOMEM; | |
291c7d2f JB |
596 | |
597 | INIT_LIST_HEAD(&caching_ctl->list); | |
598 | mutex_init(&caching_ctl->mutex); | |
599 | init_waitqueue_head(&caching_ctl->wait); | |
600 | caching_ctl->block_group = cache; | |
601 | caching_ctl->progress = cache->key.objectid; | |
1e4f4714 | 602 | refcount_set(&caching_ctl->count, 1); |
9e0af237 LB |
603 | btrfs_init_work(&caching_ctl->work, btrfs_cache_helper, |
604 | caching_thread, NULL, NULL); | |
291c7d2f JB |
605 | |
606 | spin_lock(&cache->lock); | |
607 | /* | |
608 | * This should be a rare occasion, but this could happen I think in the | |
609 | * case where one thread starts to load the space cache info, and then | |
610 | * some other thread starts a transaction commit which tries to do an | |
611 | * allocation while the other thread is still loading the space cache | |
612 | * info. The previous loop should have kept us from choosing this block | |
613 | * group, but if we've moved to the state where we will wait on caching | |
614 | * block groups we need to first check if we're doing a fast load here, | |
615 | * so we can wait for it to finish, otherwise we could end up allocating | |
616 | * from a block group who's cache gets evicted for one reason or | |
617 | * another. | |
618 | */ | |
619 | while (cache->cached == BTRFS_CACHE_FAST) { | |
620 | struct btrfs_caching_control *ctl; | |
621 | ||
622 | ctl = cache->caching_ctl; | |
1e4f4714 | 623 | refcount_inc(&ctl->count); |
291c7d2f JB |
624 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); |
625 | spin_unlock(&cache->lock); | |
626 | ||
627 | schedule(); | |
628 | ||
629 | finish_wait(&ctl->wait, &wait); | |
630 | put_caching_control(ctl); | |
631 | spin_lock(&cache->lock); | |
632 | } | |
633 | ||
634 | if (cache->cached != BTRFS_CACHE_NO) { | |
635 | spin_unlock(&cache->lock); | |
636 | kfree(caching_ctl); | |
11833d66 | 637 | return 0; |
291c7d2f JB |
638 | } |
639 | WARN_ON(cache->caching_ctl); | |
640 | cache->caching_ctl = caching_ctl; | |
641 | cache->cached = BTRFS_CACHE_FAST; | |
642 | spin_unlock(&cache->lock); | |
11833d66 | 643 | |
d8953d69 | 644 | if (btrfs_test_opt(fs_info, SPACE_CACHE)) { |
cb83b7b8 | 645 | mutex_lock(&caching_ctl->mutex); |
9d66e233 JB |
646 | ret = load_free_space_cache(fs_info, cache); |
647 | ||
648 | spin_lock(&cache->lock); | |
649 | if (ret == 1) { | |
291c7d2f | 650 | cache->caching_ctl = NULL; |
9d66e233 JB |
651 | cache->cached = BTRFS_CACHE_FINISHED; |
652 | cache->last_byte_to_unpin = (u64)-1; | |
cb83b7b8 | 653 | caching_ctl->progress = (u64)-1; |
9d66e233 | 654 | } else { |
291c7d2f JB |
655 | if (load_cache_only) { |
656 | cache->caching_ctl = NULL; | |
657 | cache->cached = BTRFS_CACHE_NO; | |
658 | } else { | |
659 | cache->cached = BTRFS_CACHE_STARTED; | |
4f69cb98 | 660 | cache->has_caching_ctl = 1; |
291c7d2f | 661 | } |
9d66e233 JB |
662 | } |
663 | spin_unlock(&cache->lock); | |
d0bd4560 JB |
664 | #ifdef CONFIG_BTRFS_DEBUG |
665 | if (ret == 1 && | |
2ff7e61e | 666 | btrfs_should_fragment_free_space(cache)) { |
d0bd4560 JB |
667 | u64 bytes_used; |
668 | ||
669 | spin_lock(&cache->space_info->lock); | |
670 | spin_lock(&cache->lock); | |
671 | bytes_used = cache->key.offset - | |
672 | btrfs_block_group_used(&cache->item); | |
673 | cache->space_info->bytes_used += bytes_used >> 1; | |
674 | spin_unlock(&cache->lock); | |
675 | spin_unlock(&cache->space_info->lock); | |
2ff7e61e | 676 | fragment_free_space(cache); |
d0bd4560 JB |
677 | } |
678 | #endif | |
cb83b7b8 JB |
679 | mutex_unlock(&caching_ctl->mutex); |
680 | ||
291c7d2f | 681 | wake_up(&caching_ctl->wait); |
3c14874a | 682 | if (ret == 1) { |
291c7d2f | 683 | put_caching_control(caching_ctl); |
9e715da8 | 684 | free_excluded_extents(cache); |
9d66e233 | 685 | return 0; |
3c14874a | 686 | } |
291c7d2f JB |
687 | } else { |
688 | /* | |
1e144fb8 OS |
689 | * We're either using the free space tree or no caching at all. |
690 | * Set cached to the appropriate value and wakeup any waiters. | |
291c7d2f JB |
691 | */ |
692 | spin_lock(&cache->lock); | |
693 | if (load_cache_only) { | |
694 | cache->caching_ctl = NULL; | |
695 | cache->cached = BTRFS_CACHE_NO; | |
696 | } else { | |
697 | cache->cached = BTRFS_CACHE_STARTED; | |
4f69cb98 | 698 | cache->has_caching_ctl = 1; |
291c7d2f JB |
699 | } |
700 | spin_unlock(&cache->lock); | |
701 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
702 | } |
703 | ||
291c7d2f JB |
704 | if (load_cache_only) { |
705 | put_caching_control(caching_ctl); | |
11833d66 | 706 | return 0; |
817d52f8 | 707 | } |
817d52f8 | 708 | |
9e351cc8 | 709 | down_write(&fs_info->commit_root_sem); |
1e4f4714 | 710 | refcount_inc(&caching_ctl->count); |
11833d66 | 711 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
9e351cc8 | 712 | up_write(&fs_info->commit_root_sem); |
11833d66 | 713 | |
11dfe35a | 714 | btrfs_get_block_group(cache); |
11833d66 | 715 | |
e66f0bb1 | 716 | btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 717 | |
ef8bbdfe | 718 | return ret; |
e37c9e69 CM |
719 | } |
720 | ||
0f9dd46c JB |
721 | /* |
722 | * return the block group that starts at or after bytenr | |
723 | */ | |
d397712b CM |
724 | static struct btrfs_block_group_cache * |
725 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 726 | { |
e2c89907 | 727 | return block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b CM |
728 | } |
729 | ||
0f9dd46c | 730 | /* |
9f55684c | 731 | * return the block group that contains the given bytenr |
0f9dd46c | 732 | */ |
d397712b CM |
733 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
734 | struct btrfs_fs_info *info, | |
735 | u64 bytenr) | |
be744175 | 736 | { |
e2c89907 | 737 | return block_group_cache_tree_search(info, bytenr, 1); |
be744175 | 738 | } |
0b86a832 | 739 | |
0f9dd46c JB |
740 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
741 | u64 flags) | |
6324fbf3 | 742 | { |
0f9dd46c | 743 | struct list_head *head = &info->space_info; |
0f9dd46c | 744 | struct btrfs_space_info *found; |
4184ea7f | 745 | |
52ba6929 | 746 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 747 | |
4184ea7f CM |
748 | rcu_read_lock(); |
749 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 750 | if (found->flags & flags) { |
4184ea7f | 751 | rcu_read_unlock(); |
0f9dd46c | 752 | return found; |
4184ea7f | 753 | } |
0f9dd46c | 754 | } |
4184ea7f | 755 | rcu_read_unlock(); |
0f9dd46c | 756 | return NULL; |
6324fbf3 CM |
757 | } |
758 | ||
0d9f824d | 759 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, s64 num_bytes, |
29d2b84c | 760 | bool metadata, u64 root_objectid) |
0d9f824d OS |
761 | { |
762 | struct btrfs_space_info *space_info; | |
763 | u64 flags; | |
764 | ||
29d2b84c | 765 | if (metadata) { |
0d9f824d OS |
766 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) |
767 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
768 | else | |
769 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
770 | } else { | |
771 | flags = BTRFS_BLOCK_GROUP_DATA; | |
772 | } | |
773 | ||
774 | space_info = __find_space_info(fs_info, flags); | |
55e8196a | 775 | ASSERT(space_info); |
dec59fa3 EL |
776 | percpu_counter_add_batch(&space_info->total_bytes_pinned, num_bytes, |
777 | BTRFS_TOTAL_BYTES_PINNED_BATCH); | |
0d9f824d OS |
778 | } |
779 | ||
4184ea7f CM |
780 | /* |
781 | * after adding space to the filesystem, we need to clear the full flags | |
782 | * on all the space infos. | |
783 | */ | |
784 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
785 | { | |
786 | struct list_head *head = &info->space_info; | |
787 | struct btrfs_space_info *found; | |
788 | ||
789 | rcu_read_lock(); | |
790 | list_for_each_entry_rcu(found, head, list) | |
791 | found->full = 0; | |
792 | rcu_read_unlock(); | |
793 | } | |
794 | ||
1a4ed8fd | 795 | /* simple helper to search for an existing data extent at a given offset */ |
2ff7e61e | 796 | int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len) |
e02119d5 CM |
797 | { |
798 | int ret; | |
799 | struct btrfs_key key; | |
31840ae1 | 800 | struct btrfs_path *path; |
e02119d5 | 801 | |
31840ae1 | 802 | path = btrfs_alloc_path(); |
d8926bb3 MF |
803 | if (!path) |
804 | return -ENOMEM; | |
805 | ||
e02119d5 CM |
806 | key.objectid = start; |
807 | key.offset = len; | |
3173a18f | 808 | key.type = BTRFS_EXTENT_ITEM_KEY; |
0b246afa | 809 | ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0); |
31840ae1 | 810 | btrfs_free_path(path); |
7bb86316 CM |
811 | return ret; |
812 | } | |
813 | ||
a22285a6 | 814 | /* |
3173a18f | 815 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
816 | * |
817 | * the head node for delayed ref is used to store the sum of all the | |
818 | * reference count modifications queued up in the rbtree. the head | |
819 | * node may also store the extent flags to set. This way you can check | |
820 | * to see what the reference count and extent flags would be if all of | |
821 | * the delayed refs are not processed. | |
822 | */ | |
823 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
2ff7e61e | 824 | struct btrfs_fs_info *fs_info, u64 bytenr, |
3173a18f | 825 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
826 | { |
827 | struct btrfs_delayed_ref_head *head; | |
828 | struct btrfs_delayed_ref_root *delayed_refs; | |
829 | struct btrfs_path *path; | |
830 | struct btrfs_extent_item *ei; | |
831 | struct extent_buffer *leaf; | |
832 | struct btrfs_key key; | |
833 | u32 item_size; | |
834 | u64 num_refs; | |
835 | u64 extent_flags; | |
836 | int ret; | |
837 | ||
3173a18f JB |
838 | /* |
839 | * If we don't have skinny metadata, don't bother doing anything | |
840 | * different | |
841 | */ | |
0b246afa JM |
842 | if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) { |
843 | offset = fs_info->nodesize; | |
3173a18f JB |
844 | metadata = 0; |
845 | } | |
846 | ||
a22285a6 YZ |
847 | path = btrfs_alloc_path(); |
848 | if (!path) | |
849 | return -ENOMEM; | |
850 | ||
a22285a6 YZ |
851 | if (!trans) { |
852 | path->skip_locking = 1; | |
853 | path->search_commit_root = 1; | |
854 | } | |
639eefc8 FDBM |
855 | |
856 | search_again: | |
857 | key.objectid = bytenr; | |
858 | key.offset = offset; | |
859 | if (metadata) | |
860 | key.type = BTRFS_METADATA_ITEM_KEY; | |
861 | else | |
862 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
863 | ||
0b246afa | 864 | ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0); |
a22285a6 YZ |
865 | if (ret < 0) |
866 | goto out_free; | |
867 | ||
3173a18f | 868 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
74be9510 FDBM |
869 | if (path->slots[0]) { |
870 | path->slots[0]--; | |
871 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
872 | path->slots[0]); | |
873 | if (key.objectid == bytenr && | |
874 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
0b246afa | 875 | key.offset == fs_info->nodesize) |
74be9510 FDBM |
876 | ret = 0; |
877 | } | |
3173a18f JB |
878 | } |
879 | ||
a22285a6 YZ |
880 | if (ret == 0) { |
881 | leaf = path->nodes[0]; | |
882 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
883 | if (item_size >= sizeof(*ei)) { | |
884 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
885 | struct btrfs_extent_item); | |
886 | num_refs = btrfs_extent_refs(leaf, ei); | |
887 | extent_flags = btrfs_extent_flags(leaf, ei); | |
888 | } else { | |
ba3c2b19 NB |
889 | ret = -EINVAL; |
890 | btrfs_print_v0_err(fs_info); | |
891 | if (trans) | |
892 | btrfs_abort_transaction(trans, ret); | |
893 | else | |
894 | btrfs_handle_fs_error(fs_info, ret, NULL); | |
895 | ||
896 | goto out_free; | |
a22285a6 | 897 | } |
ba3c2b19 | 898 | |
a22285a6 YZ |
899 | BUG_ON(num_refs == 0); |
900 | } else { | |
901 | num_refs = 0; | |
902 | extent_flags = 0; | |
903 | ret = 0; | |
904 | } | |
905 | ||
906 | if (!trans) | |
907 | goto out; | |
908 | ||
909 | delayed_refs = &trans->transaction->delayed_refs; | |
910 | spin_lock(&delayed_refs->lock); | |
f72ad18e | 911 | head = btrfs_find_delayed_ref_head(delayed_refs, bytenr); |
a22285a6 YZ |
912 | if (head) { |
913 | if (!mutex_trylock(&head->mutex)) { | |
d278850e | 914 | refcount_inc(&head->refs); |
a22285a6 YZ |
915 | spin_unlock(&delayed_refs->lock); |
916 | ||
b3b4aa74 | 917 | btrfs_release_path(path); |
a22285a6 | 918 | |
8cc33e5c DS |
919 | /* |
920 | * Mutex was contended, block until it's released and try | |
921 | * again | |
922 | */ | |
a22285a6 YZ |
923 | mutex_lock(&head->mutex); |
924 | mutex_unlock(&head->mutex); | |
d278850e | 925 | btrfs_put_delayed_ref_head(head); |
639eefc8 | 926 | goto search_again; |
a22285a6 | 927 | } |
d7df2c79 | 928 | spin_lock(&head->lock); |
a22285a6 YZ |
929 | if (head->extent_op && head->extent_op->update_flags) |
930 | extent_flags |= head->extent_op->flags_to_set; | |
931 | else | |
932 | BUG_ON(num_refs == 0); | |
933 | ||
d278850e | 934 | num_refs += head->ref_mod; |
d7df2c79 | 935 | spin_unlock(&head->lock); |
a22285a6 YZ |
936 | mutex_unlock(&head->mutex); |
937 | } | |
938 | spin_unlock(&delayed_refs->lock); | |
939 | out: | |
940 | WARN_ON(num_refs == 0); | |
941 | if (refs) | |
942 | *refs = num_refs; | |
943 | if (flags) | |
944 | *flags = extent_flags; | |
945 | out_free: | |
946 | btrfs_free_path(path); | |
947 | return ret; | |
948 | } | |
949 | ||
d8d5f3e1 CM |
950 | /* |
951 | * Back reference rules. Back refs have three main goals: | |
952 | * | |
953 | * 1) differentiate between all holders of references to an extent so that | |
954 | * when a reference is dropped we can make sure it was a valid reference | |
955 | * before freeing the extent. | |
956 | * | |
957 | * 2) Provide enough information to quickly find the holders of an extent | |
958 | * if we notice a given block is corrupted or bad. | |
959 | * | |
960 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
961 | * maintenance. This is actually the same as #2, but with a slightly | |
962 | * different use case. | |
963 | * | |
5d4f98a2 YZ |
964 | * There are two kinds of back refs. The implicit back refs is optimized |
965 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
966 | * back refs of this kind provide information about the block's owner tree | |
967 | * and the pointer's key. These information allow us to find the block by | |
968 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
969 | * referenced by their owner trees. The location of tree block is recorded | |
970 | * in the back refs. Actually the full back refs is generic, and can be | |
971 | * used in all cases the implicit back refs is used. The major shortcoming | |
972 | * of the full back refs is its overhead. Every time a tree block gets | |
973 | * COWed, we have to update back refs entry for all pointers in it. | |
974 | * | |
975 | * For a newly allocated tree block, we use implicit back refs for | |
976 | * pointers in it. This means most tree related operations only involve | |
977 | * implicit back refs. For a tree block created in old transaction, the | |
978 | * only way to drop a reference to it is COW it. So we can detect the | |
979 | * event that tree block loses its owner tree's reference and do the | |
980 | * back refs conversion. | |
981 | * | |
01327610 | 982 | * When a tree block is COWed through a tree, there are four cases: |
5d4f98a2 YZ |
983 | * |
984 | * The reference count of the block is one and the tree is the block's | |
985 | * owner tree. Nothing to do in this case. | |
986 | * | |
987 | * The reference count of the block is one and the tree is not the | |
988 | * block's owner tree. In this case, full back refs is used for pointers | |
989 | * in the block. Remove these full back refs, add implicit back refs for | |
990 | * every pointers in the new block. | |
991 | * | |
992 | * The reference count of the block is greater than one and the tree is | |
993 | * the block's owner tree. In this case, implicit back refs is used for | |
994 | * pointers in the block. Add full back refs for every pointers in the | |
995 | * block, increase lower level extents' reference counts. The original | |
996 | * implicit back refs are entailed to the new block. | |
997 | * | |
998 | * The reference count of the block is greater than one and the tree is | |
999 | * not the block's owner tree. Add implicit back refs for every pointer in | |
1000 | * the new block, increase lower level extents' reference count. | |
1001 | * | |
1002 | * Back Reference Key composing: | |
1003 | * | |
1004 | * The key objectid corresponds to the first byte in the extent, | |
1005 | * The key type is used to differentiate between types of back refs. | |
1006 | * There are different meanings of the key offset for different types | |
1007 | * of back refs. | |
1008 | * | |
d8d5f3e1 CM |
1009 | * File extents can be referenced by: |
1010 | * | |
1011 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 1012 | * - different files inside a single subvolume |
d8d5f3e1 CM |
1013 | * - different offsets inside a file (bookend extents in file.c) |
1014 | * | |
5d4f98a2 | 1015 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
1016 | * |
1017 | * - Objectid of the subvolume root | |
d8d5f3e1 | 1018 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
1019 | * - original offset in the file |
1020 | * - how many bookend extents | |
d8d5f3e1 | 1021 | * |
5d4f98a2 YZ |
1022 | * The key offset for the implicit back refs is hash of the first |
1023 | * three fields. | |
d8d5f3e1 | 1024 | * |
5d4f98a2 | 1025 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 1026 | * |
5d4f98a2 | 1027 | * - number of pointers in the tree leaf |
d8d5f3e1 | 1028 | * |
5d4f98a2 YZ |
1029 | * The key offset for the implicit back refs is the first byte of |
1030 | * the tree leaf | |
d8d5f3e1 | 1031 | * |
5d4f98a2 YZ |
1032 | * When a file extent is allocated, The implicit back refs is used. |
1033 | * the fields are filled in: | |
d8d5f3e1 | 1034 | * |
5d4f98a2 | 1035 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 1036 | * |
5d4f98a2 YZ |
1037 | * When a file extent is removed file truncation, we find the |
1038 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 1039 | * |
5d4f98a2 | 1040 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 1041 | * |
5d4f98a2 | 1042 | * Btree extents can be referenced by: |
d8d5f3e1 | 1043 | * |
5d4f98a2 | 1044 | * - Different subvolumes |
d8d5f3e1 | 1045 | * |
5d4f98a2 YZ |
1046 | * Both the implicit back refs and the full back refs for tree blocks |
1047 | * only consist of key. The key offset for the implicit back refs is | |
1048 | * objectid of block's owner tree. The key offset for the full back refs | |
1049 | * is the first byte of parent block. | |
d8d5f3e1 | 1050 | * |
5d4f98a2 YZ |
1051 | * When implicit back refs is used, information about the lowest key and |
1052 | * level of the tree block are required. These information are stored in | |
1053 | * tree block info structure. | |
d8d5f3e1 | 1054 | */ |
31840ae1 | 1055 | |
167ce953 LB |
1056 | /* |
1057 | * is_data == BTRFS_REF_TYPE_BLOCK, tree block type is required, | |
1058 | * is_data == BTRFS_REF_TYPE_DATA, data type is requried, | |
1059 | * is_data == BTRFS_REF_TYPE_ANY, either type is OK. | |
1060 | */ | |
1061 | int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb, | |
1062 | struct btrfs_extent_inline_ref *iref, | |
1063 | enum btrfs_inline_ref_type is_data) | |
1064 | { | |
1065 | int type = btrfs_extent_inline_ref_type(eb, iref); | |
64ecdb64 | 1066 | u64 offset = btrfs_extent_inline_ref_offset(eb, iref); |
167ce953 LB |
1067 | |
1068 | if (type == BTRFS_TREE_BLOCK_REF_KEY || | |
1069 | type == BTRFS_SHARED_BLOCK_REF_KEY || | |
1070 | type == BTRFS_SHARED_DATA_REF_KEY || | |
1071 | type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1072 | if (is_data == BTRFS_REF_TYPE_BLOCK) { | |
64ecdb64 | 1073 | if (type == BTRFS_TREE_BLOCK_REF_KEY) |
167ce953 | 1074 | return type; |
64ecdb64 LB |
1075 | if (type == BTRFS_SHARED_BLOCK_REF_KEY) { |
1076 | ASSERT(eb->fs_info); | |
1077 | /* | |
1078 | * Every shared one has parent tree | |
1079 | * block, which must be aligned to | |
1080 | * nodesize. | |
1081 | */ | |
1082 | if (offset && | |
1083 | IS_ALIGNED(offset, eb->fs_info->nodesize)) | |
1084 | return type; | |
1085 | } | |
167ce953 | 1086 | } else if (is_data == BTRFS_REF_TYPE_DATA) { |
64ecdb64 | 1087 | if (type == BTRFS_EXTENT_DATA_REF_KEY) |
167ce953 | 1088 | return type; |
64ecdb64 LB |
1089 | if (type == BTRFS_SHARED_DATA_REF_KEY) { |
1090 | ASSERT(eb->fs_info); | |
1091 | /* | |
1092 | * Every shared one has parent tree | |
1093 | * block, which must be aligned to | |
1094 | * nodesize. | |
1095 | */ | |
1096 | if (offset && | |
1097 | IS_ALIGNED(offset, eb->fs_info->nodesize)) | |
1098 | return type; | |
1099 | } | |
167ce953 LB |
1100 | } else { |
1101 | ASSERT(is_data == BTRFS_REF_TYPE_ANY); | |
1102 | return type; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | btrfs_print_leaf((struct extent_buffer *)eb); | |
1107 | btrfs_err(eb->fs_info, "eb %llu invalid extent inline ref type %d", | |
1108 | eb->start, type); | |
1109 | WARN_ON(1); | |
1110 | ||
1111 | return BTRFS_REF_TYPE_INVALID; | |
1112 | } | |
1113 | ||
5d4f98a2 YZ |
1114 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) |
1115 | { | |
1116 | u32 high_crc = ~(u32)0; | |
1117 | u32 low_crc = ~(u32)0; | |
1118 | __le64 lenum; | |
1119 | ||
1120 | lenum = cpu_to_le64(root_objectid); | |
9678c543 | 1121 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1122 | lenum = cpu_to_le64(owner); |
9678c543 | 1123 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1124 | lenum = cpu_to_le64(offset); |
9678c543 | 1125 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1126 | |
1127 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1128 | } | |
1129 | ||
1130 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1131 | struct btrfs_extent_data_ref *ref) | |
1132 | { | |
1133 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1134 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1135 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1136 | } | |
1137 | ||
1138 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1139 | struct btrfs_extent_data_ref *ref, | |
1140 | u64 root_objectid, u64 owner, u64 offset) | |
1141 | { | |
1142 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1143 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1144 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1145 | return 0; | |
1146 | return 1; | |
1147 | } | |
1148 | ||
1149 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
5d4f98a2 YZ |
1150 | struct btrfs_path *path, |
1151 | u64 bytenr, u64 parent, | |
1152 | u64 root_objectid, | |
1153 | u64 owner, u64 offset) | |
1154 | { | |
bd1d53ef | 1155 | struct btrfs_root *root = trans->fs_info->extent_root; |
5d4f98a2 YZ |
1156 | struct btrfs_key key; |
1157 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1158 | struct extent_buffer *leaf; |
5d4f98a2 | 1159 | u32 nritems; |
74493f7a | 1160 | int ret; |
5d4f98a2 YZ |
1161 | int recow; |
1162 | int err = -ENOENT; | |
74493f7a | 1163 | |
31840ae1 | 1164 | key.objectid = bytenr; |
5d4f98a2 YZ |
1165 | if (parent) { |
1166 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1167 | key.offset = parent; | |
1168 | } else { | |
1169 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1170 | key.offset = hash_extent_data_ref(root_objectid, | |
1171 | owner, offset); | |
1172 | } | |
1173 | again: | |
1174 | recow = 0; | |
1175 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1176 | if (ret < 0) { | |
1177 | err = ret; | |
1178 | goto fail; | |
1179 | } | |
31840ae1 | 1180 | |
5d4f98a2 YZ |
1181 | if (parent) { |
1182 | if (!ret) | |
1183 | return 0; | |
5d4f98a2 | 1184 | goto fail; |
31840ae1 ZY |
1185 | } |
1186 | ||
1187 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1188 | nritems = btrfs_header_nritems(leaf); |
1189 | while (1) { | |
1190 | if (path->slots[0] >= nritems) { | |
1191 | ret = btrfs_next_leaf(root, path); | |
1192 | if (ret < 0) | |
1193 | err = ret; | |
1194 | if (ret) | |
1195 | goto fail; | |
1196 | ||
1197 | leaf = path->nodes[0]; | |
1198 | nritems = btrfs_header_nritems(leaf); | |
1199 | recow = 1; | |
1200 | } | |
1201 | ||
1202 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1203 | if (key.objectid != bytenr || | |
1204 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1205 | goto fail; | |
1206 | ||
1207 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1208 | struct btrfs_extent_data_ref); | |
1209 | ||
1210 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1211 | owner, offset)) { | |
1212 | if (recow) { | |
b3b4aa74 | 1213 | btrfs_release_path(path); |
5d4f98a2 YZ |
1214 | goto again; |
1215 | } | |
1216 | err = 0; | |
1217 | break; | |
1218 | } | |
1219 | path->slots[0]++; | |
31840ae1 | 1220 | } |
5d4f98a2 YZ |
1221 | fail: |
1222 | return err; | |
31840ae1 ZY |
1223 | } |
1224 | ||
5d4f98a2 | 1225 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1226 | struct btrfs_path *path, |
1227 | u64 bytenr, u64 parent, | |
1228 | u64 root_objectid, u64 owner, | |
1229 | u64 offset, int refs_to_add) | |
31840ae1 | 1230 | { |
62b895af | 1231 | struct btrfs_root *root = trans->fs_info->extent_root; |
31840ae1 ZY |
1232 | struct btrfs_key key; |
1233 | struct extent_buffer *leaf; | |
5d4f98a2 | 1234 | u32 size; |
31840ae1 ZY |
1235 | u32 num_refs; |
1236 | int ret; | |
74493f7a | 1237 | |
74493f7a | 1238 | key.objectid = bytenr; |
5d4f98a2 YZ |
1239 | if (parent) { |
1240 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1241 | key.offset = parent; | |
1242 | size = sizeof(struct btrfs_shared_data_ref); | |
1243 | } else { | |
1244 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1245 | key.offset = hash_extent_data_ref(root_objectid, | |
1246 | owner, offset); | |
1247 | size = sizeof(struct btrfs_extent_data_ref); | |
1248 | } | |
74493f7a | 1249 | |
5d4f98a2 YZ |
1250 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1251 | if (ret && ret != -EEXIST) | |
1252 | goto fail; | |
1253 | ||
1254 | leaf = path->nodes[0]; | |
1255 | if (parent) { | |
1256 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1257 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1258 | struct btrfs_shared_data_ref); |
1259 | if (ret == 0) { | |
1260 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1261 | } else { | |
1262 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1263 | num_refs += refs_to_add; | |
1264 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1265 | } |
5d4f98a2 YZ |
1266 | } else { |
1267 | struct btrfs_extent_data_ref *ref; | |
1268 | while (ret == -EEXIST) { | |
1269 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1270 | struct btrfs_extent_data_ref); | |
1271 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1272 | owner, offset)) | |
1273 | break; | |
b3b4aa74 | 1274 | btrfs_release_path(path); |
5d4f98a2 YZ |
1275 | key.offset++; |
1276 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1277 | size); | |
1278 | if (ret && ret != -EEXIST) | |
1279 | goto fail; | |
31840ae1 | 1280 | |
5d4f98a2 YZ |
1281 | leaf = path->nodes[0]; |
1282 | } | |
1283 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1284 | struct btrfs_extent_data_ref); | |
1285 | if (ret == 0) { | |
1286 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1287 | root_objectid); | |
1288 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1289 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1290 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1291 | } else { | |
1292 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1293 | num_refs += refs_to_add; | |
1294 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1295 | } |
31840ae1 | 1296 | } |
5d4f98a2 YZ |
1297 | btrfs_mark_buffer_dirty(leaf); |
1298 | ret = 0; | |
1299 | fail: | |
b3b4aa74 | 1300 | btrfs_release_path(path); |
7bb86316 | 1301 | return ret; |
74493f7a CM |
1302 | } |
1303 | ||
5d4f98a2 | 1304 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 | 1305 | struct btrfs_path *path, |
fcebe456 | 1306 | int refs_to_drop, int *last_ref) |
31840ae1 | 1307 | { |
5d4f98a2 YZ |
1308 | struct btrfs_key key; |
1309 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1310 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1311 | struct extent_buffer *leaf; |
5d4f98a2 | 1312 | u32 num_refs = 0; |
31840ae1 ZY |
1313 | int ret = 0; |
1314 | ||
1315 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1316 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1317 | ||
1318 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1319 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1320 | struct btrfs_extent_data_ref); | |
1321 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1322 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1323 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1324 | struct btrfs_shared_data_ref); | |
1325 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
6d8ff4e4 | 1326 | } else if (unlikely(key.type == BTRFS_EXTENT_REF_V0_KEY)) { |
ba3c2b19 NB |
1327 | btrfs_print_v0_err(trans->fs_info); |
1328 | btrfs_abort_transaction(trans, -EINVAL); | |
1329 | return -EINVAL; | |
5d4f98a2 YZ |
1330 | } else { |
1331 | BUG(); | |
1332 | } | |
1333 | ||
56bec294 CM |
1334 | BUG_ON(num_refs < refs_to_drop); |
1335 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1336 | |
31840ae1 | 1337 | if (num_refs == 0) { |
e9f6290d | 1338 | ret = btrfs_del_item(trans, trans->fs_info->extent_root, path); |
fcebe456 | 1339 | *last_ref = 1; |
31840ae1 | 1340 | } else { |
5d4f98a2 YZ |
1341 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1342 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1343 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1344 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
31840ae1 ZY |
1345 | btrfs_mark_buffer_dirty(leaf); |
1346 | } | |
31840ae1 ZY |
1347 | return ret; |
1348 | } | |
1349 | ||
9ed0dea0 | 1350 | static noinline u32 extent_data_ref_count(struct btrfs_path *path, |
5d4f98a2 | 1351 | struct btrfs_extent_inline_ref *iref) |
15916de8 | 1352 | { |
5d4f98a2 YZ |
1353 | struct btrfs_key key; |
1354 | struct extent_buffer *leaf; | |
1355 | struct btrfs_extent_data_ref *ref1; | |
1356 | struct btrfs_shared_data_ref *ref2; | |
1357 | u32 num_refs = 0; | |
3de28d57 | 1358 | int type; |
5d4f98a2 YZ |
1359 | |
1360 | leaf = path->nodes[0]; | |
1361 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
ba3c2b19 NB |
1362 | |
1363 | BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); | |
5d4f98a2 | 1364 | if (iref) { |
3de28d57 LB |
1365 | /* |
1366 | * If type is invalid, we should have bailed out earlier than | |
1367 | * this call. | |
1368 | */ | |
1369 | type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA); | |
1370 | ASSERT(type != BTRFS_REF_TYPE_INVALID); | |
1371 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
5d4f98a2 YZ |
1372 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); |
1373 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1374 | } else { | |
1375 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1376 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1377 | } | |
1378 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1379 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1380 | struct btrfs_extent_data_ref); | |
1381 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1382 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1383 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1384 | struct btrfs_shared_data_ref); | |
1385 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
5d4f98a2 YZ |
1386 | } else { |
1387 | WARN_ON(1); | |
1388 | } | |
1389 | return num_refs; | |
1390 | } | |
15916de8 | 1391 | |
5d4f98a2 | 1392 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1393 | struct btrfs_path *path, |
1394 | u64 bytenr, u64 parent, | |
1395 | u64 root_objectid) | |
1f3c79a2 | 1396 | { |
b8582eea | 1397 | struct btrfs_root *root = trans->fs_info->extent_root; |
5d4f98a2 | 1398 | struct btrfs_key key; |
1f3c79a2 | 1399 | int ret; |
1f3c79a2 | 1400 | |
5d4f98a2 YZ |
1401 | key.objectid = bytenr; |
1402 | if (parent) { | |
1403 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1404 | key.offset = parent; | |
1405 | } else { | |
1406 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1407 | key.offset = root_objectid; | |
1f3c79a2 LH |
1408 | } |
1409 | ||
5d4f98a2 YZ |
1410 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1411 | if (ret > 0) | |
1412 | ret = -ENOENT; | |
5d4f98a2 | 1413 | return ret; |
1f3c79a2 LH |
1414 | } |
1415 | ||
5d4f98a2 | 1416 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1417 | struct btrfs_path *path, |
1418 | u64 bytenr, u64 parent, | |
1419 | u64 root_objectid) | |
31840ae1 | 1420 | { |
5d4f98a2 | 1421 | struct btrfs_key key; |
31840ae1 | 1422 | int ret; |
31840ae1 | 1423 | |
5d4f98a2 YZ |
1424 | key.objectid = bytenr; |
1425 | if (parent) { | |
1426 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1427 | key.offset = parent; | |
1428 | } else { | |
1429 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1430 | key.offset = root_objectid; | |
1431 | } | |
1432 | ||
10728404 | 1433 | ret = btrfs_insert_empty_item(trans, trans->fs_info->extent_root, |
87bde3cd | 1434 | path, &key, 0); |
b3b4aa74 | 1435 | btrfs_release_path(path); |
31840ae1 ZY |
1436 | return ret; |
1437 | } | |
1438 | ||
5d4f98a2 | 1439 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1440 | { |
5d4f98a2 YZ |
1441 | int type; |
1442 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1443 | if (parent > 0) | |
1444 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1445 | else | |
1446 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1447 | } else { | |
1448 | if (parent > 0) | |
1449 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1450 | else | |
1451 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1452 | } | |
1453 | return type; | |
31840ae1 | 1454 | } |
56bec294 | 1455 | |
2c47e605 YZ |
1456 | static int find_next_key(struct btrfs_path *path, int level, |
1457 | struct btrfs_key *key) | |
56bec294 | 1458 | |
02217ed2 | 1459 | { |
2c47e605 | 1460 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1461 | if (!path->nodes[level]) |
1462 | break; | |
5d4f98a2 YZ |
1463 | if (path->slots[level] + 1 >= |
1464 | btrfs_header_nritems(path->nodes[level])) | |
1465 | continue; | |
1466 | if (level == 0) | |
1467 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1468 | path->slots[level] + 1); | |
1469 | else | |
1470 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1471 | path->slots[level] + 1); | |
1472 | return 0; | |
1473 | } | |
1474 | return 1; | |
1475 | } | |
037e6390 | 1476 | |
5d4f98a2 YZ |
1477 | /* |
1478 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1479 | * to the address of inline back ref, and 0 is returned. | |
1480 | * | |
1481 | * if back ref isn't found, *ref_ret is set to the address where it | |
1482 | * should be inserted, and -ENOENT is returned. | |
1483 | * | |
1484 | * if insert is true and there are too many inline back refs, the path | |
1485 | * points to the extent item, and -EAGAIN is returned. | |
1486 | * | |
1487 | * NOTE: inline back refs are ordered in the same way that back ref | |
1488 | * items in the tree are ordered. | |
1489 | */ | |
1490 | static noinline_for_stack | |
1491 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
5d4f98a2 YZ |
1492 | struct btrfs_path *path, |
1493 | struct btrfs_extent_inline_ref **ref_ret, | |
1494 | u64 bytenr, u64 num_bytes, | |
1495 | u64 parent, u64 root_objectid, | |
1496 | u64 owner, u64 offset, int insert) | |
1497 | { | |
867cc1fb | 1498 | struct btrfs_fs_info *fs_info = trans->fs_info; |
87bde3cd | 1499 | struct btrfs_root *root = fs_info->extent_root; |
5d4f98a2 YZ |
1500 | struct btrfs_key key; |
1501 | struct extent_buffer *leaf; | |
1502 | struct btrfs_extent_item *ei; | |
1503 | struct btrfs_extent_inline_ref *iref; | |
1504 | u64 flags; | |
1505 | u64 item_size; | |
1506 | unsigned long ptr; | |
1507 | unsigned long end; | |
1508 | int extra_size; | |
1509 | int type; | |
1510 | int want; | |
1511 | int ret; | |
1512 | int err = 0; | |
0b246afa | 1513 | bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA); |
3de28d57 | 1514 | int needed; |
26b8003f | 1515 | |
db94535d | 1516 | key.objectid = bytenr; |
31840ae1 | 1517 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1518 | key.offset = num_bytes; |
31840ae1 | 1519 | |
5d4f98a2 YZ |
1520 | want = extent_ref_type(parent, owner); |
1521 | if (insert) { | |
1522 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1523 | path->keep_locks = 1; |
5d4f98a2 YZ |
1524 | } else |
1525 | extra_size = -1; | |
3173a18f JB |
1526 | |
1527 | /* | |
16d1c062 NB |
1528 | * Owner is our level, so we can just add one to get the level for the |
1529 | * block we are interested in. | |
3173a18f JB |
1530 | */ |
1531 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1532 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1533 | key.offset = owner; | |
1534 | } | |
1535 | ||
1536 | again: | |
5d4f98a2 | 1537 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1538 | if (ret < 0) { |
5d4f98a2 YZ |
1539 | err = ret; |
1540 | goto out; | |
1541 | } | |
3173a18f JB |
1542 | |
1543 | /* | |
1544 | * We may be a newly converted file system which still has the old fat | |
1545 | * extent entries for metadata, so try and see if we have one of those. | |
1546 | */ | |
1547 | if (ret > 0 && skinny_metadata) { | |
1548 | skinny_metadata = false; | |
1549 | if (path->slots[0]) { | |
1550 | path->slots[0]--; | |
1551 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1552 | path->slots[0]); | |
1553 | if (key.objectid == bytenr && | |
1554 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1555 | key.offset == num_bytes) | |
1556 | ret = 0; | |
1557 | } | |
1558 | if (ret) { | |
9ce49a0b | 1559 | key.objectid = bytenr; |
3173a18f JB |
1560 | key.type = BTRFS_EXTENT_ITEM_KEY; |
1561 | key.offset = num_bytes; | |
1562 | btrfs_release_path(path); | |
1563 | goto again; | |
1564 | } | |
1565 | } | |
1566 | ||
79787eaa JM |
1567 | if (ret && !insert) { |
1568 | err = -ENOENT; | |
1569 | goto out; | |
fae7f21c | 1570 | } else if (WARN_ON(ret)) { |
492104c8 | 1571 | err = -EIO; |
492104c8 | 1572 | goto out; |
79787eaa | 1573 | } |
5d4f98a2 YZ |
1574 | |
1575 | leaf = path->nodes[0]; | |
1576 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
6d8ff4e4 | 1577 | if (unlikely(item_size < sizeof(*ei))) { |
ba3c2b19 NB |
1578 | err = -EINVAL; |
1579 | btrfs_print_v0_err(fs_info); | |
1580 | btrfs_abort_transaction(trans, err); | |
1581 | goto out; | |
1582 | } | |
5d4f98a2 | 1583 | |
5d4f98a2 YZ |
1584 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1585 | flags = btrfs_extent_flags(leaf, ei); | |
1586 | ||
1587 | ptr = (unsigned long)(ei + 1); | |
1588 | end = (unsigned long)ei + item_size; | |
1589 | ||
3173a18f | 1590 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
5d4f98a2 YZ |
1591 | ptr += sizeof(struct btrfs_tree_block_info); |
1592 | BUG_ON(ptr > end); | |
5d4f98a2 YZ |
1593 | } |
1594 | ||
3de28d57 LB |
1595 | if (owner >= BTRFS_FIRST_FREE_OBJECTID) |
1596 | needed = BTRFS_REF_TYPE_DATA; | |
1597 | else | |
1598 | needed = BTRFS_REF_TYPE_BLOCK; | |
1599 | ||
5d4f98a2 YZ |
1600 | err = -ENOENT; |
1601 | while (1) { | |
1602 | if (ptr >= end) { | |
1603 | WARN_ON(ptr > end); | |
1604 | break; | |
1605 | } | |
1606 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
3de28d57 LB |
1607 | type = btrfs_get_extent_inline_ref_type(leaf, iref, needed); |
1608 | if (type == BTRFS_REF_TYPE_INVALID) { | |
af431dcb | 1609 | err = -EUCLEAN; |
3de28d57 LB |
1610 | goto out; |
1611 | } | |
1612 | ||
5d4f98a2 YZ |
1613 | if (want < type) |
1614 | break; | |
1615 | if (want > type) { | |
1616 | ptr += btrfs_extent_inline_ref_size(type); | |
1617 | continue; | |
1618 | } | |
1619 | ||
1620 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1621 | struct btrfs_extent_data_ref *dref; | |
1622 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1623 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1624 | owner, offset)) { | |
1625 | err = 0; | |
1626 | break; | |
1627 | } | |
1628 | if (hash_extent_data_ref_item(leaf, dref) < | |
1629 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1630 | break; | |
1631 | } else { | |
1632 | u64 ref_offset; | |
1633 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1634 | if (parent > 0) { | |
1635 | if (parent == ref_offset) { | |
1636 | err = 0; | |
1637 | break; | |
1638 | } | |
1639 | if (ref_offset < parent) | |
1640 | break; | |
1641 | } else { | |
1642 | if (root_objectid == ref_offset) { | |
1643 | err = 0; | |
1644 | break; | |
1645 | } | |
1646 | if (ref_offset < root_objectid) | |
1647 | break; | |
1648 | } | |
1649 | } | |
1650 | ptr += btrfs_extent_inline_ref_size(type); | |
1651 | } | |
1652 | if (err == -ENOENT && insert) { | |
1653 | if (item_size + extra_size >= | |
1654 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1655 | err = -EAGAIN; | |
1656 | goto out; | |
1657 | } | |
1658 | /* | |
1659 | * To add new inline back ref, we have to make sure | |
1660 | * there is no corresponding back ref item. | |
1661 | * For simplicity, we just do not add new inline back | |
1662 | * ref if there is any kind of item for this block | |
1663 | */ | |
2c47e605 YZ |
1664 | if (find_next_key(path, 0, &key) == 0 && |
1665 | key.objectid == bytenr && | |
85d4198e | 1666 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1667 | err = -EAGAIN; |
1668 | goto out; | |
1669 | } | |
1670 | } | |
1671 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1672 | out: | |
85d4198e | 1673 | if (insert) { |
5d4f98a2 YZ |
1674 | path->keep_locks = 0; |
1675 | btrfs_unlock_up_safe(path, 1); | |
1676 | } | |
1677 | return err; | |
1678 | } | |
1679 | ||
1680 | /* | |
1681 | * helper to add new inline back ref | |
1682 | */ | |
1683 | static noinline_for_stack | |
87bde3cd | 1684 | void setup_inline_extent_backref(struct btrfs_fs_info *fs_info, |
143bede5 JM |
1685 | struct btrfs_path *path, |
1686 | struct btrfs_extent_inline_ref *iref, | |
1687 | u64 parent, u64 root_objectid, | |
1688 | u64 owner, u64 offset, int refs_to_add, | |
1689 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1690 | { |
1691 | struct extent_buffer *leaf; | |
1692 | struct btrfs_extent_item *ei; | |
1693 | unsigned long ptr; | |
1694 | unsigned long end; | |
1695 | unsigned long item_offset; | |
1696 | u64 refs; | |
1697 | int size; | |
1698 | int type; | |
5d4f98a2 YZ |
1699 | |
1700 | leaf = path->nodes[0]; | |
1701 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1702 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1703 | ||
1704 | type = extent_ref_type(parent, owner); | |
1705 | size = btrfs_extent_inline_ref_size(type); | |
1706 | ||
87bde3cd | 1707 | btrfs_extend_item(fs_info, path, size); |
5d4f98a2 YZ |
1708 | |
1709 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1710 | refs = btrfs_extent_refs(leaf, ei); | |
1711 | refs += refs_to_add; | |
1712 | btrfs_set_extent_refs(leaf, ei, refs); | |
1713 | if (extent_op) | |
1714 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1715 | ||
1716 | ptr = (unsigned long)ei + item_offset; | |
1717 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1718 | if (ptr < end - size) | |
1719 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1720 | end - size - ptr); | |
1721 | ||
1722 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1723 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1724 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1725 | struct btrfs_extent_data_ref *dref; | |
1726 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1727 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1728 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1729 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1730 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1731 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1732 | struct btrfs_shared_data_ref *sref; | |
1733 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1734 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1735 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1736 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1737 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1738 | } else { | |
1739 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1740 | } | |
1741 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1742 | } |
1743 | ||
1744 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
5d4f98a2 YZ |
1745 | struct btrfs_path *path, |
1746 | struct btrfs_extent_inline_ref **ref_ret, | |
1747 | u64 bytenr, u64 num_bytes, u64 parent, | |
1748 | u64 root_objectid, u64 owner, u64 offset) | |
1749 | { | |
1750 | int ret; | |
1751 | ||
867cc1fb NB |
1752 | ret = lookup_inline_extent_backref(trans, path, ref_ret, bytenr, |
1753 | num_bytes, parent, root_objectid, | |
1754 | owner, offset, 0); | |
5d4f98a2 | 1755 | if (ret != -ENOENT) |
54aa1f4d | 1756 | return ret; |
5d4f98a2 | 1757 | |
b3b4aa74 | 1758 | btrfs_release_path(path); |
5d4f98a2 YZ |
1759 | *ref_ret = NULL; |
1760 | ||
1761 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
b8582eea NB |
1762 | ret = lookup_tree_block_ref(trans, path, bytenr, parent, |
1763 | root_objectid); | |
5d4f98a2 | 1764 | } else { |
bd1d53ef NB |
1765 | ret = lookup_extent_data_ref(trans, path, bytenr, parent, |
1766 | root_objectid, owner, offset); | |
b9473439 | 1767 | } |
5d4f98a2 YZ |
1768 | return ret; |
1769 | } | |
31840ae1 | 1770 | |
5d4f98a2 YZ |
1771 | /* |
1772 | * helper to update/remove inline back ref | |
1773 | */ | |
1774 | static noinline_for_stack | |
61a18f1c | 1775 | void update_inline_extent_backref(struct btrfs_path *path, |
143bede5 JM |
1776 | struct btrfs_extent_inline_ref *iref, |
1777 | int refs_to_mod, | |
fcebe456 JB |
1778 | struct btrfs_delayed_extent_op *extent_op, |
1779 | int *last_ref) | |
5d4f98a2 | 1780 | { |
61a18f1c NB |
1781 | struct extent_buffer *leaf = path->nodes[0]; |
1782 | struct btrfs_fs_info *fs_info = leaf->fs_info; | |
5d4f98a2 YZ |
1783 | struct btrfs_extent_item *ei; |
1784 | struct btrfs_extent_data_ref *dref = NULL; | |
1785 | struct btrfs_shared_data_ref *sref = NULL; | |
1786 | unsigned long ptr; | |
1787 | unsigned long end; | |
1788 | u32 item_size; | |
1789 | int size; | |
1790 | int type; | |
5d4f98a2 YZ |
1791 | u64 refs; |
1792 | ||
5d4f98a2 YZ |
1793 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1794 | refs = btrfs_extent_refs(leaf, ei); | |
1795 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1796 | refs += refs_to_mod; | |
1797 | btrfs_set_extent_refs(leaf, ei, refs); | |
1798 | if (extent_op) | |
1799 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1800 | ||
3de28d57 LB |
1801 | /* |
1802 | * If type is invalid, we should have bailed out after | |
1803 | * lookup_inline_extent_backref(). | |
1804 | */ | |
1805 | type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_ANY); | |
1806 | ASSERT(type != BTRFS_REF_TYPE_INVALID); | |
5d4f98a2 YZ |
1807 | |
1808 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1809 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1810 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1811 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1812 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1813 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1814 | } else { | |
1815 | refs = 1; | |
1816 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1817 | } |
31840ae1 | 1818 | |
5d4f98a2 YZ |
1819 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1820 | refs += refs_to_mod; | |
1821 | ||
1822 | if (refs > 0) { | |
1823 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1824 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1825 | else | |
1826 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1827 | } else { | |
fcebe456 | 1828 | *last_ref = 1; |
5d4f98a2 YZ |
1829 | size = btrfs_extent_inline_ref_size(type); |
1830 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1831 | ptr = (unsigned long)iref; | |
1832 | end = (unsigned long)ei + item_size; | |
1833 | if (ptr + size < end) | |
1834 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1835 | end - ptr - size); | |
1836 | item_size -= size; | |
87bde3cd | 1837 | btrfs_truncate_item(fs_info, path, item_size, 1); |
5d4f98a2 YZ |
1838 | } |
1839 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1840 | } |
1841 | ||
1842 | static noinline_for_stack | |
1843 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
5d4f98a2 YZ |
1844 | struct btrfs_path *path, |
1845 | u64 bytenr, u64 num_bytes, u64 parent, | |
1846 | u64 root_objectid, u64 owner, | |
1847 | u64 offset, int refs_to_add, | |
1848 | struct btrfs_delayed_extent_op *extent_op) | |
1849 | { | |
1850 | struct btrfs_extent_inline_ref *iref; | |
1851 | int ret; | |
1852 | ||
867cc1fb NB |
1853 | ret = lookup_inline_extent_backref(trans, path, &iref, bytenr, |
1854 | num_bytes, parent, root_objectid, | |
1855 | owner, offset, 1); | |
5d4f98a2 YZ |
1856 | if (ret == 0) { |
1857 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
61a18f1c NB |
1858 | update_inline_extent_backref(path, iref, refs_to_add, |
1859 | extent_op, NULL); | |
5d4f98a2 | 1860 | } else if (ret == -ENOENT) { |
a639cdeb | 1861 | setup_inline_extent_backref(trans->fs_info, path, iref, parent, |
143bede5 JM |
1862 | root_objectid, owner, offset, |
1863 | refs_to_add, extent_op); | |
1864 | ret = 0; | |
771ed689 | 1865 | } |
5d4f98a2 YZ |
1866 | return ret; |
1867 | } | |
31840ae1 | 1868 | |
5d4f98a2 | 1869 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1870 | struct btrfs_path *path, |
1871 | u64 bytenr, u64 parent, u64 root_objectid, | |
1872 | u64 owner, u64 offset, int refs_to_add) | |
1873 | { | |
1874 | int ret; | |
1875 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1876 | BUG_ON(refs_to_add != 1); | |
10728404 NB |
1877 | ret = insert_tree_block_ref(trans, path, bytenr, parent, |
1878 | root_objectid); | |
5d4f98a2 | 1879 | } else { |
62b895af NB |
1880 | ret = insert_extent_data_ref(trans, path, bytenr, parent, |
1881 | root_objectid, owner, offset, | |
1882 | refs_to_add); | |
5d4f98a2 YZ |
1883 | } |
1884 | return ret; | |
1885 | } | |
56bec294 | 1886 | |
5d4f98a2 | 1887 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1888 | struct btrfs_path *path, |
1889 | struct btrfs_extent_inline_ref *iref, | |
fcebe456 | 1890 | int refs_to_drop, int is_data, int *last_ref) |
5d4f98a2 | 1891 | { |
143bede5 | 1892 | int ret = 0; |
b9473439 | 1893 | |
5d4f98a2 YZ |
1894 | BUG_ON(!is_data && refs_to_drop != 1); |
1895 | if (iref) { | |
61a18f1c NB |
1896 | update_inline_extent_backref(path, iref, -refs_to_drop, NULL, |
1897 | last_ref); | |
5d4f98a2 | 1898 | } else if (is_data) { |
e9f6290d | 1899 | ret = remove_extent_data_ref(trans, path, refs_to_drop, |
fcebe456 | 1900 | last_ref); |
5d4f98a2 | 1901 | } else { |
fcebe456 | 1902 | *last_ref = 1; |
87cc7a8a | 1903 | ret = btrfs_del_item(trans, trans->fs_info->extent_root, path); |
5d4f98a2 YZ |
1904 | } |
1905 | return ret; | |
1906 | } | |
1907 | ||
86557861 | 1908 | #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len)) |
d04c6b88 JM |
1909 | static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len, |
1910 | u64 *discarded_bytes) | |
5d4f98a2 | 1911 | { |
86557861 JM |
1912 | int j, ret = 0; |
1913 | u64 bytes_left, end; | |
4d89d377 | 1914 | u64 aligned_start = ALIGN(start, 1 << 9); |
d04c6b88 | 1915 | |
4d89d377 JM |
1916 | if (WARN_ON(start != aligned_start)) { |
1917 | len -= aligned_start - start; | |
1918 | len = round_down(len, 1 << 9); | |
1919 | start = aligned_start; | |
1920 | } | |
d04c6b88 | 1921 | |
4d89d377 | 1922 | *discarded_bytes = 0; |
86557861 JM |
1923 | |
1924 | if (!len) | |
1925 | return 0; | |
1926 | ||
1927 | end = start + len; | |
1928 | bytes_left = len; | |
1929 | ||
1930 | /* Skip any superblocks on this device. */ | |
1931 | for (j = 0; j < BTRFS_SUPER_MIRROR_MAX; j++) { | |
1932 | u64 sb_start = btrfs_sb_offset(j); | |
1933 | u64 sb_end = sb_start + BTRFS_SUPER_INFO_SIZE; | |
1934 | u64 size = sb_start - start; | |
1935 | ||
1936 | if (!in_range(sb_start, start, bytes_left) && | |
1937 | !in_range(sb_end, start, bytes_left) && | |
1938 | !in_range(start, sb_start, BTRFS_SUPER_INFO_SIZE)) | |
1939 | continue; | |
1940 | ||
1941 | /* | |
1942 | * Superblock spans beginning of range. Adjust start and | |
1943 | * try again. | |
1944 | */ | |
1945 | if (sb_start <= start) { | |
1946 | start += sb_end - start; | |
1947 | if (start > end) { | |
1948 | bytes_left = 0; | |
1949 | break; | |
1950 | } | |
1951 | bytes_left = end - start; | |
1952 | continue; | |
1953 | } | |
1954 | ||
1955 | if (size) { | |
1956 | ret = blkdev_issue_discard(bdev, start >> 9, size >> 9, | |
1957 | GFP_NOFS, 0); | |
1958 | if (!ret) | |
1959 | *discarded_bytes += size; | |
1960 | else if (ret != -EOPNOTSUPP) | |
1961 | return ret; | |
1962 | } | |
1963 | ||
1964 | start = sb_end; | |
1965 | if (start > end) { | |
1966 | bytes_left = 0; | |
1967 | break; | |
1968 | } | |
1969 | bytes_left = end - start; | |
1970 | } | |
1971 | ||
1972 | if (bytes_left) { | |
1973 | ret = blkdev_issue_discard(bdev, start >> 9, bytes_left >> 9, | |
4d89d377 JM |
1974 | GFP_NOFS, 0); |
1975 | if (!ret) | |
86557861 | 1976 | *discarded_bytes += bytes_left; |
4d89d377 | 1977 | } |
d04c6b88 | 1978 | return ret; |
5d4f98a2 | 1979 | } |
5d4f98a2 | 1980 | |
2ff7e61e | 1981 | int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr, |
1edb647b | 1982 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1983 | { |
5d4f98a2 | 1984 | int ret; |
5378e607 | 1985 | u64 discarded_bytes = 0; |
a1d3c478 | 1986 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1987 | |
e244a0ae | 1988 | |
2999241d FM |
1989 | /* |
1990 | * Avoid races with device replace and make sure our bbio has devices | |
1991 | * associated to its stripes that don't go away while we are discarding. | |
1992 | */ | |
0b246afa | 1993 | btrfs_bio_counter_inc_blocked(fs_info); |
5d4f98a2 | 1994 | /* Tell the block device(s) that the sectors can be discarded */ |
0b246afa JM |
1995 | ret = btrfs_map_block(fs_info, BTRFS_MAP_DISCARD, bytenr, &num_bytes, |
1996 | &bbio, 0); | |
79787eaa | 1997 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1998 | if (!ret) { |
a1d3c478 | 1999 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
2000 | int i; |
2001 | ||
5d4f98a2 | 2002 | |
a1d3c478 | 2003 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d04c6b88 | 2004 | u64 bytes; |
38b5f68e AJ |
2005 | struct request_queue *req_q; |
2006 | ||
627e0873 FM |
2007 | if (!stripe->dev->bdev) { |
2008 | ASSERT(btrfs_test_opt(fs_info, DEGRADED)); | |
2009 | continue; | |
2010 | } | |
38b5f68e AJ |
2011 | req_q = bdev_get_queue(stripe->dev->bdev); |
2012 | if (!blk_queue_discard(req_q)) | |
d5e2003c JB |
2013 | continue; |
2014 | ||
5378e607 LD |
2015 | ret = btrfs_issue_discard(stripe->dev->bdev, |
2016 | stripe->physical, | |
d04c6b88 JM |
2017 | stripe->length, |
2018 | &bytes); | |
5378e607 | 2019 | if (!ret) |
d04c6b88 | 2020 | discarded_bytes += bytes; |
5378e607 | 2021 | else if (ret != -EOPNOTSUPP) |
79787eaa | 2022 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
2023 | |
2024 | /* | |
2025 | * Just in case we get back EOPNOTSUPP for some reason, | |
2026 | * just ignore the return value so we don't screw up | |
2027 | * people calling discard_extent. | |
2028 | */ | |
2029 | ret = 0; | |
5d4f98a2 | 2030 | } |
6e9606d2 | 2031 | btrfs_put_bbio(bbio); |
5d4f98a2 | 2032 | } |
0b246afa | 2033 | btrfs_bio_counter_dec(fs_info); |
5378e607 LD |
2034 | |
2035 | if (actual_bytes) | |
2036 | *actual_bytes = discarded_bytes; | |
2037 | ||
5d4f98a2 | 2038 | |
53b381b3 DW |
2039 | if (ret == -EOPNOTSUPP) |
2040 | ret = 0; | |
5d4f98a2 | 2041 | return ret; |
5d4f98a2 YZ |
2042 | } |
2043 | ||
79787eaa | 2044 | /* Can return -ENOMEM */ |
5d4f98a2 | 2045 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
84f7d8e6 | 2046 | struct btrfs_root *root, |
5d4f98a2 | 2047 | u64 bytenr, u64 num_bytes, u64 parent, |
b06c4bf5 | 2048 | u64 root_objectid, u64 owner, u64 offset) |
5d4f98a2 | 2049 | { |
84f7d8e6 | 2050 | struct btrfs_fs_info *fs_info = root->fs_info; |
d7eae340 | 2051 | int old_ref_mod, new_ref_mod; |
5d4f98a2 | 2052 | int ret; |
66d7e7f0 | 2053 | |
5d4f98a2 YZ |
2054 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
2055 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
2056 | ||
fd708b81 JB |
2057 | btrfs_ref_tree_mod(root, bytenr, num_bytes, parent, root_objectid, |
2058 | owner, offset, BTRFS_ADD_DELAYED_REF); | |
2059 | ||
5d4f98a2 | 2060 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
44e1c47d | 2061 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, |
7be07912 OS |
2062 | num_bytes, parent, |
2063 | root_objectid, (int)owner, | |
2064 | BTRFS_ADD_DELAYED_REF, NULL, | |
d7eae340 | 2065 | &old_ref_mod, &new_ref_mod); |
5d4f98a2 | 2066 | } else { |
88a979c6 | 2067 | ret = btrfs_add_delayed_data_ref(trans, bytenr, |
7be07912 OS |
2068 | num_bytes, parent, |
2069 | root_objectid, owner, offset, | |
d7eae340 OS |
2070 | 0, BTRFS_ADD_DELAYED_REF, |
2071 | &old_ref_mod, &new_ref_mod); | |
5d4f98a2 | 2072 | } |
d7eae340 | 2073 | |
29d2b84c NB |
2074 | if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0) { |
2075 | bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID; | |
2076 | ||
2077 | add_pinned_bytes(fs_info, -num_bytes, metadata, root_objectid); | |
2078 | } | |
d7eae340 | 2079 | |
5d4f98a2 YZ |
2080 | return ret; |
2081 | } | |
2082 | ||
bd3c685e NB |
2083 | /* |
2084 | * __btrfs_inc_extent_ref - insert backreference for a given extent | |
2085 | * | |
2086 | * @trans: Handle of transaction | |
2087 | * | |
2088 | * @node: The delayed ref node used to get the bytenr/length for | |
2089 | * extent whose references are incremented. | |
2090 | * | |
2091 | * @parent: If this is a shared extent (BTRFS_SHARED_DATA_REF_KEY/ | |
2092 | * BTRFS_SHARED_BLOCK_REF_KEY) then it holds the logical | |
2093 | * bytenr of the parent block. Since new extents are always | |
2094 | * created with indirect references, this will only be the case | |
2095 | * when relocating a shared extent. In that case, root_objectid | |
2096 | * will be BTRFS_TREE_RELOC_OBJECTID. Otheriwse, parent must | |
2097 | * be 0 | |
2098 | * | |
2099 | * @root_objectid: The id of the root where this modification has originated, | |
2100 | * this can be either one of the well-known metadata trees or | |
2101 | * the subvolume id which references this extent. | |
2102 | * | |
2103 | * @owner: For data extents it is the inode number of the owning file. | |
2104 | * For metadata extents this parameter holds the level in the | |
2105 | * tree of the extent. | |
2106 | * | |
2107 | * @offset: For metadata extents the offset is ignored and is currently | |
2108 | * always passed as 0. For data extents it is the fileoffset | |
2109 | * this extent belongs to. | |
2110 | * | |
2111 | * @refs_to_add Number of references to add | |
2112 | * | |
2113 | * @extent_op Pointer to a structure, holding information necessary when | |
2114 | * updating a tree block's flags | |
2115 | * | |
2116 | */ | |
5d4f98a2 | 2117 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
c682f9b3 | 2118 | struct btrfs_delayed_ref_node *node, |
5d4f98a2 YZ |
2119 | u64 parent, u64 root_objectid, |
2120 | u64 owner, u64 offset, int refs_to_add, | |
2121 | struct btrfs_delayed_extent_op *extent_op) | |
2122 | { | |
2123 | struct btrfs_path *path; | |
2124 | struct extent_buffer *leaf; | |
2125 | struct btrfs_extent_item *item; | |
fcebe456 | 2126 | struct btrfs_key key; |
c682f9b3 QW |
2127 | u64 bytenr = node->bytenr; |
2128 | u64 num_bytes = node->num_bytes; | |
5d4f98a2 YZ |
2129 | u64 refs; |
2130 | int ret; | |
5d4f98a2 YZ |
2131 | |
2132 | path = btrfs_alloc_path(); | |
2133 | if (!path) | |
2134 | return -ENOMEM; | |
2135 | ||
e4058b54 | 2136 | path->reada = READA_FORWARD; |
5d4f98a2 YZ |
2137 | path->leave_spinning = 1; |
2138 | /* this will setup the path even if it fails to insert the back ref */ | |
a639cdeb NB |
2139 | ret = insert_inline_extent_backref(trans, path, bytenr, num_bytes, |
2140 | parent, root_objectid, owner, | |
2141 | offset, refs_to_add, extent_op); | |
0ed4792a | 2142 | if ((ret < 0 && ret != -EAGAIN) || !ret) |
5d4f98a2 | 2143 | goto out; |
fcebe456 JB |
2144 | |
2145 | /* | |
2146 | * Ok we had -EAGAIN which means we didn't have space to insert and | |
2147 | * inline extent ref, so just update the reference count and add a | |
2148 | * normal backref. | |
2149 | */ | |
5d4f98a2 | 2150 | leaf = path->nodes[0]; |
fcebe456 | 2151 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
5d4f98a2 YZ |
2152 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
2153 | refs = btrfs_extent_refs(leaf, item); | |
2154 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2155 | if (extent_op) | |
2156 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 2157 | |
5d4f98a2 | 2158 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 2159 | btrfs_release_path(path); |
56bec294 | 2160 | |
e4058b54 | 2161 | path->reada = READA_FORWARD; |
b9473439 | 2162 | path->leave_spinning = 1; |
56bec294 | 2163 | /* now insert the actual backref */ |
37593410 NB |
2164 | ret = insert_extent_backref(trans, path, bytenr, parent, root_objectid, |
2165 | owner, offset, refs_to_add); | |
79787eaa | 2166 | if (ret) |
66642832 | 2167 | btrfs_abort_transaction(trans, ret); |
5d4f98a2 | 2168 | out: |
56bec294 | 2169 | btrfs_free_path(path); |
30d133fc | 2170 | return ret; |
56bec294 CM |
2171 | } |
2172 | ||
5d4f98a2 | 2173 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
2174 | struct btrfs_delayed_ref_node *node, |
2175 | struct btrfs_delayed_extent_op *extent_op, | |
2176 | int insert_reserved) | |
56bec294 | 2177 | { |
5d4f98a2 YZ |
2178 | int ret = 0; |
2179 | struct btrfs_delayed_data_ref *ref; | |
2180 | struct btrfs_key ins; | |
2181 | u64 parent = 0; | |
2182 | u64 ref_root = 0; | |
2183 | u64 flags = 0; | |
2184 | ||
2185 | ins.objectid = node->bytenr; | |
2186 | ins.offset = node->num_bytes; | |
2187 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2188 | ||
2189 | ref = btrfs_delayed_node_to_data_ref(node); | |
2bf98ef3 | 2190 | trace_run_delayed_data_ref(trans->fs_info, node, ref, node->action); |
599c75ec | 2191 | |
5d4f98a2 YZ |
2192 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
2193 | parent = ref->parent; | |
fcebe456 | 2194 | ref_root = ref->root; |
5d4f98a2 YZ |
2195 | |
2196 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2197 | if (extent_op) |
5d4f98a2 | 2198 | flags |= extent_op->flags_to_set; |
ef89b824 NB |
2199 | ret = alloc_reserved_file_extent(trans, parent, ref_root, |
2200 | flags, ref->objectid, | |
2201 | ref->offset, &ins, | |
2202 | node->ref_mod); | |
5d4f98a2 | 2203 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2590d0f1 NB |
2204 | ret = __btrfs_inc_extent_ref(trans, node, parent, ref_root, |
2205 | ref->objectid, ref->offset, | |
2206 | node->ref_mod, extent_op); | |
5d4f98a2 | 2207 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
e72cb923 | 2208 | ret = __btrfs_free_extent(trans, node, parent, |
5d4f98a2 YZ |
2209 | ref_root, ref->objectid, |
2210 | ref->offset, node->ref_mod, | |
c682f9b3 | 2211 | extent_op); |
5d4f98a2 YZ |
2212 | } else { |
2213 | BUG(); | |
2214 | } | |
2215 | return ret; | |
2216 | } | |
2217 | ||
2218 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2219 | struct extent_buffer *leaf, | |
2220 | struct btrfs_extent_item *ei) | |
2221 | { | |
2222 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2223 | if (extent_op->update_flags) { | |
2224 | flags |= extent_op->flags_to_set; | |
2225 | btrfs_set_extent_flags(leaf, ei, flags); | |
2226 | } | |
2227 | ||
2228 | if (extent_op->update_key) { | |
2229 | struct btrfs_tree_block_info *bi; | |
2230 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2231 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2232 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2233 | } | |
2234 | } | |
2235 | ||
2236 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
d278850e | 2237 | struct btrfs_delayed_ref_head *head, |
5d4f98a2 YZ |
2238 | struct btrfs_delayed_extent_op *extent_op) |
2239 | { | |
20b9a2d6 | 2240 | struct btrfs_fs_info *fs_info = trans->fs_info; |
5d4f98a2 YZ |
2241 | struct btrfs_key key; |
2242 | struct btrfs_path *path; | |
2243 | struct btrfs_extent_item *ei; | |
2244 | struct extent_buffer *leaf; | |
2245 | u32 item_size; | |
56bec294 | 2246 | int ret; |
5d4f98a2 | 2247 | int err = 0; |
b1c79e09 | 2248 | int metadata = !extent_op->is_data; |
5d4f98a2 | 2249 | |
79787eaa JM |
2250 | if (trans->aborted) |
2251 | return 0; | |
2252 | ||
0b246afa | 2253 | if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3173a18f JB |
2254 | metadata = 0; |
2255 | ||
5d4f98a2 YZ |
2256 | path = btrfs_alloc_path(); |
2257 | if (!path) | |
2258 | return -ENOMEM; | |
2259 | ||
d278850e | 2260 | key.objectid = head->bytenr; |
5d4f98a2 | 2261 | |
3173a18f | 2262 | if (metadata) { |
3173a18f | 2263 | key.type = BTRFS_METADATA_ITEM_KEY; |
b1c79e09 | 2264 | key.offset = extent_op->level; |
3173a18f JB |
2265 | } else { |
2266 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
d278850e | 2267 | key.offset = head->num_bytes; |
3173a18f JB |
2268 | } |
2269 | ||
2270 | again: | |
e4058b54 | 2271 | path->reada = READA_FORWARD; |
5d4f98a2 | 2272 | path->leave_spinning = 1; |
0b246afa | 2273 | ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 1); |
5d4f98a2 YZ |
2274 | if (ret < 0) { |
2275 | err = ret; | |
2276 | goto out; | |
2277 | } | |
2278 | if (ret > 0) { | |
3173a18f | 2279 | if (metadata) { |
55994887 FDBM |
2280 | if (path->slots[0] > 0) { |
2281 | path->slots[0]--; | |
2282 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
2283 | path->slots[0]); | |
d278850e | 2284 | if (key.objectid == head->bytenr && |
55994887 | 2285 | key.type == BTRFS_EXTENT_ITEM_KEY && |
d278850e | 2286 | key.offset == head->num_bytes) |
55994887 FDBM |
2287 | ret = 0; |
2288 | } | |
2289 | if (ret > 0) { | |
2290 | btrfs_release_path(path); | |
2291 | metadata = 0; | |
3173a18f | 2292 | |
d278850e JB |
2293 | key.objectid = head->bytenr; |
2294 | key.offset = head->num_bytes; | |
55994887 FDBM |
2295 | key.type = BTRFS_EXTENT_ITEM_KEY; |
2296 | goto again; | |
2297 | } | |
2298 | } else { | |
2299 | err = -EIO; | |
2300 | goto out; | |
3173a18f | 2301 | } |
5d4f98a2 YZ |
2302 | } |
2303 | ||
2304 | leaf = path->nodes[0]; | |
2305 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
ba3c2b19 | 2306 | |
6d8ff4e4 | 2307 | if (unlikely(item_size < sizeof(*ei))) { |
ba3c2b19 NB |
2308 | err = -EINVAL; |
2309 | btrfs_print_v0_err(fs_info); | |
2310 | btrfs_abort_transaction(trans, err); | |
2311 | goto out; | |
2312 | } | |
2313 | ||
5d4f98a2 YZ |
2314 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
2315 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2316 | |
5d4f98a2 YZ |
2317 | btrfs_mark_buffer_dirty(leaf); |
2318 | out: | |
2319 | btrfs_free_path(path); | |
2320 | return err; | |
56bec294 CM |
2321 | } |
2322 | ||
5d4f98a2 | 2323 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
2324 | struct btrfs_delayed_ref_node *node, |
2325 | struct btrfs_delayed_extent_op *extent_op, | |
2326 | int insert_reserved) | |
56bec294 CM |
2327 | { |
2328 | int ret = 0; | |
5d4f98a2 | 2329 | struct btrfs_delayed_tree_ref *ref; |
5d4f98a2 YZ |
2330 | u64 parent = 0; |
2331 | u64 ref_root = 0; | |
56bec294 | 2332 | |
5d4f98a2 | 2333 | ref = btrfs_delayed_node_to_tree_ref(node); |
f97806f2 | 2334 | trace_run_delayed_tree_ref(trans->fs_info, node, ref, node->action); |
599c75ec | 2335 | |
5d4f98a2 YZ |
2336 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
2337 | parent = ref->parent; | |
fcebe456 | 2338 | ref_root = ref->root; |
5d4f98a2 | 2339 | |
02794222 | 2340 | if (node->ref_mod != 1) { |
f97806f2 | 2341 | btrfs_err(trans->fs_info, |
02794222 LB |
2342 | "btree block(%llu) has %d references rather than 1: action %d ref_root %llu parent %llu", |
2343 | node->bytenr, node->ref_mod, node->action, ref_root, | |
2344 | parent); | |
2345 | return -EIO; | |
2346 | } | |
5d4f98a2 | 2347 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
3173a18f | 2348 | BUG_ON(!extent_op || !extent_op->update_flags); |
21ebfbe7 | 2349 | ret = alloc_reserved_tree_block(trans, node, extent_op); |
5d4f98a2 | 2350 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2590d0f1 NB |
2351 | ret = __btrfs_inc_extent_ref(trans, node, parent, ref_root, |
2352 | ref->level, 0, 1, extent_op); | |
5d4f98a2 | 2353 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
e72cb923 | 2354 | ret = __btrfs_free_extent(trans, node, parent, ref_root, |
c682f9b3 | 2355 | ref->level, 0, 1, extent_op); |
5d4f98a2 YZ |
2356 | } else { |
2357 | BUG(); | |
2358 | } | |
56bec294 CM |
2359 | return ret; |
2360 | } | |
2361 | ||
2362 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 | 2363 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
2364 | struct btrfs_delayed_ref_node *node, |
2365 | struct btrfs_delayed_extent_op *extent_op, | |
2366 | int insert_reserved) | |
56bec294 | 2367 | { |
79787eaa JM |
2368 | int ret = 0; |
2369 | ||
857cc2fc JB |
2370 | if (trans->aborted) { |
2371 | if (insert_reserved) | |
5fac7f9e | 2372 | btrfs_pin_extent(trans->fs_info, node->bytenr, |
857cc2fc | 2373 | node->num_bytes, 1); |
79787eaa | 2374 | return 0; |
857cc2fc | 2375 | } |
79787eaa | 2376 | |
5d4f98a2 YZ |
2377 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2378 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
f97806f2 | 2379 | ret = run_delayed_tree_ref(trans, node, extent_op, |
5d4f98a2 YZ |
2380 | insert_reserved); |
2381 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2382 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2bf98ef3 | 2383 | ret = run_delayed_data_ref(trans, node, extent_op, |
5d4f98a2 YZ |
2384 | insert_reserved); |
2385 | else | |
2386 | BUG(); | |
80ee54bf JB |
2387 | if (ret && insert_reserved) |
2388 | btrfs_pin_extent(trans->fs_info, node->bytenr, | |
2389 | node->num_bytes, 1); | |
5d4f98a2 | 2390 | return ret; |
56bec294 CM |
2391 | } |
2392 | ||
c6fc2454 | 2393 | static inline struct btrfs_delayed_ref_node * |
56bec294 CM |
2394 | select_delayed_ref(struct btrfs_delayed_ref_head *head) |
2395 | { | |
cffc3374 FM |
2396 | struct btrfs_delayed_ref_node *ref; |
2397 | ||
e3d03965 | 2398 | if (RB_EMPTY_ROOT(&head->ref_tree.rb_root)) |
c6fc2454 | 2399 | return NULL; |
d7df2c79 | 2400 | |
cffc3374 FM |
2401 | /* |
2402 | * Select a delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2403 | * This is to prevent a ref count from going down to zero, which deletes | |
2404 | * the extent item from the extent tree, when there still are references | |
2405 | * to add, which would fail because they would not find the extent item. | |
2406 | */ | |
1d57ee94 WX |
2407 | if (!list_empty(&head->ref_add_list)) |
2408 | return list_first_entry(&head->ref_add_list, | |
2409 | struct btrfs_delayed_ref_node, add_list); | |
2410 | ||
e3d03965 | 2411 | ref = rb_entry(rb_first_cached(&head->ref_tree), |
0e0adbcf | 2412 | struct btrfs_delayed_ref_node, ref_node); |
1d57ee94 WX |
2413 | ASSERT(list_empty(&ref->add_list)); |
2414 | return ref; | |
56bec294 CM |
2415 | } |
2416 | ||
2eadaa22 JB |
2417 | static void unselect_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, |
2418 | struct btrfs_delayed_ref_head *head) | |
2419 | { | |
2420 | spin_lock(&delayed_refs->lock); | |
2421 | head->processing = 0; | |
2422 | delayed_refs->num_heads_ready++; | |
2423 | spin_unlock(&delayed_refs->lock); | |
2424 | btrfs_delayed_ref_unlock(head); | |
2425 | } | |
2426 | ||
b00e6250 | 2427 | static int cleanup_extent_op(struct btrfs_trans_handle *trans, |
b00e6250 JB |
2428 | struct btrfs_delayed_ref_head *head) |
2429 | { | |
2430 | struct btrfs_delayed_extent_op *extent_op = head->extent_op; | |
2431 | int ret; | |
2432 | ||
2433 | if (!extent_op) | |
2434 | return 0; | |
2435 | head->extent_op = NULL; | |
2436 | if (head->must_insert_reserved) { | |
2437 | btrfs_free_delayed_extent_op(extent_op); | |
2438 | return 0; | |
2439 | } | |
2440 | spin_unlock(&head->lock); | |
20b9a2d6 | 2441 | ret = run_delayed_extent_op(trans, head, extent_op); |
b00e6250 JB |
2442 | btrfs_free_delayed_extent_op(extent_op); |
2443 | return ret ? ret : 1; | |
2444 | } | |
2445 | ||
194ab0bc | 2446 | static int cleanup_ref_head(struct btrfs_trans_handle *trans, |
194ab0bc JB |
2447 | struct btrfs_delayed_ref_head *head) |
2448 | { | |
f9871edd NB |
2449 | |
2450 | struct btrfs_fs_info *fs_info = trans->fs_info; | |
194ab0bc JB |
2451 | struct btrfs_delayed_ref_root *delayed_refs; |
2452 | int ret; | |
2453 | ||
2454 | delayed_refs = &trans->transaction->delayed_refs; | |
2455 | ||
c4d56d4a | 2456 | ret = cleanup_extent_op(trans, head); |
194ab0bc JB |
2457 | if (ret < 0) { |
2458 | unselect_delayed_ref_head(delayed_refs, head); | |
2459 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); | |
2460 | return ret; | |
2461 | } else if (ret) { | |
2462 | return ret; | |
2463 | } | |
2464 | ||
2465 | /* | |
2466 | * Need to drop our head ref lock and re-acquire the delayed ref lock | |
2467 | * and then re-check to make sure nobody got added. | |
2468 | */ | |
2469 | spin_unlock(&head->lock); | |
2470 | spin_lock(&delayed_refs->lock); | |
2471 | spin_lock(&head->lock); | |
e3d03965 | 2472 | if (!RB_EMPTY_ROOT(&head->ref_tree.rb_root) || head->extent_op) { |
194ab0bc JB |
2473 | spin_unlock(&head->lock); |
2474 | spin_unlock(&delayed_refs->lock); | |
2475 | return 1; | |
2476 | } | |
194ab0bc | 2477 | delayed_refs->num_heads--; |
5c9d028b | 2478 | rb_erase_cached(&head->href_node, &delayed_refs->href_root); |
d278850e | 2479 | RB_CLEAR_NODE(&head->href_node); |
c1103f7a | 2480 | spin_unlock(&head->lock); |
1e7a1421 | 2481 | spin_unlock(&delayed_refs->lock); |
c1103f7a JB |
2482 | atomic_dec(&delayed_refs->num_entries); |
2483 | ||
d278850e | 2484 | trace_run_delayed_ref_head(fs_info, head, 0); |
c1103f7a JB |
2485 | |
2486 | if (head->total_ref_mod < 0) { | |
5e388e95 NB |
2487 | struct btrfs_space_info *space_info; |
2488 | u64 flags; | |
c1103f7a | 2489 | |
5e388e95 NB |
2490 | if (head->is_data) |
2491 | flags = BTRFS_BLOCK_GROUP_DATA; | |
2492 | else if (head->is_system) | |
2493 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
2494 | else | |
2495 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
2496 | space_info = __find_space_info(fs_info, flags); | |
2497 | ASSERT(space_info); | |
dec59fa3 EL |
2498 | percpu_counter_add_batch(&space_info->total_bytes_pinned, |
2499 | -head->num_bytes, | |
2500 | BTRFS_TOTAL_BYTES_PINNED_BATCH); | |
c1103f7a JB |
2501 | |
2502 | if (head->is_data) { | |
2503 | spin_lock(&delayed_refs->lock); | |
d278850e | 2504 | delayed_refs->pending_csums -= head->num_bytes; |
c1103f7a JB |
2505 | spin_unlock(&delayed_refs->lock); |
2506 | } | |
2507 | } | |
2508 | ||
2509 | if (head->must_insert_reserved) { | |
d278850e JB |
2510 | btrfs_pin_extent(fs_info, head->bytenr, |
2511 | head->num_bytes, 1); | |
c1103f7a | 2512 | if (head->is_data) { |
d278850e JB |
2513 | ret = btrfs_del_csums(trans, fs_info, head->bytenr, |
2514 | head->num_bytes); | |
c1103f7a JB |
2515 | } |
2516 | } | |
2517 | ||
2518 | /* Also free its reserved qgroup space */ | |
2519 | btrfs_qgroup_free_delayed_ref(fs_info, head->qgroup_ref_root, | |
2520 | head->qgroup_reserved); | |
2521 | btrfs_delayed_ref_unlock(head); | |
d278850e | 2522 | btrfs_put_delayed_ref_head(head); |
194ab0bc JB |
2523 | return 0; |
2524 | } | |
2525 | ||
b1cdbcb5 NB |
2526 | static struct btrfs_delayed_ref_head *btrfs_obtain_ref_head( |
2527 | struct btrfs_trans_handle *trans) | |
2528 | { | |
2529 | struct btrfs_delayed_ref_root *delayed_refs = | |
2530 | &trans->transaction->delayed_refs; | |
2531 | struct btrfs_delayed_ref_head *head = NULL; | |
2532 | int ret; | |
2533 | ||
2534 | spin_lock(&delayed_refs->lock); | |
5637c74b | 2535 | head = btrfs_select_ref_head(delayed_refs); |
b1cdbcb5 NB |
2536 | if (!head) { |
2537 | spin_unlock(&delayed_refs->lock); | |
2538 | return head; | |
2539 | } | |
2540 | ||
2541 | /* | |
2542 | * Grab the lock that says we are going to process all the refs for | |
2543 | * this head | |
2544 | */ | |
9e920a6f | 2545 | ret = btrfs_delayed_ref_lock(delayed_refs, head); |
b1cdbcb5 NB |
2546 | spin_unlock(&delayed_refs->lock); |
2547 | ||
2548 | /* | |
2549 | * We may have dropped the spin lock to get the head mutex lock, and | |
2550 | * that might have given someone else time to free the head. If that's | |
2551 | * true, it has been removed from our list and we can move on. | |
2552 | */ | |
2553 | if (ret == -EAGAIN) | |
2554 | head = ERR_PTR(-EAGAIN); | |
2555 | ||
2556 | return head; | |
2557 | } | |
2558 | ||
e7261386 NB |
2559 | static int btrfs_run_delayed_refs_for_head(struct btrfs_trans_handle *trans, |
2560 | struct btrfs_delayed_ref_head *locked_ref, | |
2561 | unsigned long *run_refs) | |
2562 | { | |
2563 | struct btrfs_fs_info *fs_info = trans->fs_info; | |
2564 | struct btrfs_delayed_ref_root *delayed_refs; | |
2565 | struct btrfs_delayed_extent_op *extent_op; | |
2566 | struct btrfs_delayed_ref_node *ref; | |
2567 | int must_insert_reserved = 0; | |
2568 | int ret; | |
2569 | ||
2570 | delayed_refs = &trans->transaction->delayed_refs; | |
2571 | ||
0110a4c4 NB |
2572 | lockdep_assert_held(&locked_ref->mutex); |
2573 | lockdep_assert_held(&locked_ref->lock); | |
2574 | ||
e7261386 NB |
2575 | while ((ref = select_delayed_ref(locked_ref))) { |
2576 | if (ref->seq && | |
2577 | btrfs_check_delayed_seq(fs_info, ref->seq)) { | |
2578 | spin_unlock(&locked_ref->lock); | |
2579 | unselect_delayed_ref_head(delayed_refs, locked_ref); | |
2580 | return -EAGAIN; | |
2581 | } | |
2582 | ||
2583 | (*run_refs)++; | |
2584 | ref->in_tree = 0; | |
2585 | rb_erase_cached(&ref->ref_node, &locked_ref->ref_tree); | |
2586 | RB_CLEAR_NODE(&ref->ref_node); | |
2587 | if (!list_empty(&ref->add_list)) | |
2588 | list_del(&ref->add_list); | |
2589 | /* | |
2590 | * When we play the delayed ref, also correct the ref_mod on | |
2591 | * head | |
2592 | */ | |
2593 | switch (ref->action) { | |
2594 | case BTRFS_ADD_DELAYED_REF: | |
2595 | case BTRFS_ADD_DELAYED_EXTENT: | |
2596 | locked_ref->ref_mod -= ref->ref_mod; | |
2597 | break; | |
2598 | case BTRFS_DROP_DELAYED_REF: | |
2599 | locked_ref->ref_mod += ref->ref_mod; | |
2600 | break; | |
2601 | default: | |
2602 | WARN_ON(1); | |
2603 | } | |
2604 | atomic_dec(&delayed_refs->num_entries); | |
2605 | ||
2606 | /* | |
2607 | * Record the must_insert_reserved flag before we drop the | |
2608 | * spin lock. | |
2609 | */ | |
2610 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2611 | locked_ref->must_insert_reserved = 0; | |
2612 | ||
2613 | extent_op = locked_ref->extent_op; | |
2614 | locked_ref->extent_op = NULL; | |
2615 | spin_unlock(&locked_ref->lock); | |
2616 | ||
2617 | ret = run_one_delayed_ref(trans, ref, extent_op, | |
2618 | must_insert_reserved); | |
2619 | ||
2620 | btrfs_free_delayed_extent_op(extent_op); | |
2621 | if (ret) { | |
2622 | unselect_delayed_ref_head(delayed_refs, locked_ref); | |
2623 | btrfs_put_delayed_ref(ref); | |
2624 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", | |
2625 | ret); | |
2626 | return ret; | |
2627 | } | |
2628 | ||
2629 | btrfs_put_delayed_ref(ref); | |
2630 | cond_resched(); | |
2631 | ||
2632 | spin_lock(&locked_ref->lock); | |
2633 | btrfs_merge_delayed_refs(trans, delayed_refs, locked_ref); | |
2634 | } | |
2635 | ||
2636 | return 0; | |
2637 | } | |
2638 | ||
79787eaa JM |
2639 | /* |
2640 | * Returns 0 on success or if called with an already aborted transaction. | |
2641 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2642 | */ | |
d7df2c79 | 2643 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
d7df2c79 | 2644 | unsigned long nr) |
56bec294 | 2645 | { |
0a1e458a | 2646 | struct btrfs_fs_info *fs_info = trans->fs_info; |
56bec294 | 2647 | struct btrfs_delayed_ref_root *delayed_refs; |
56bec294 | 2648 | struct btrfs_delayed_ref_head *locked_ref = NULL; |
0a2b2a84 | 2649 | ktime_t start = ktime_get(); |
56bec294 | 2650 | int ret; |
d7df2c79 | 2651 | unsigned long count = 0; |
0a2b2a84 | 2652 | unsigned long actual_count = 0; |
56bec294 CM |
2653 | |
2654 | delayed_refs = &trans->transaction->delayed_refs; | |
0110a4c4 | 2655 | do { |
56bec294 | 2656 | if (!locked_ref) { |
b1cdbcb5 | 2657 | locked_ref = btrfs_obtain_ref_head(trans); |
0110a4c4 NB |
2658 | if (IS_ERR_OR_NULL(locked_ref)) { |
2659 | if (PTR_ERR(locked_ref) == -EAGAIN) { | |
2660 | continue; | |
2661 | } else { | |
2662 | break; | |
2663 | } | |
56bec294 | 2664 | } |
0110a4c4 | 2665 | count++; |
56bec294 | 2666 | } |
2c3cf7d5 FM |
2667 | /* |
2668 | * We need to try and merge add/drops of the same ref since we | |
2669 | * can run into issues with relocate dropping the implicit ref | |
2670 | * and then it being added back again before the drop can | |
2671 | * finish. If we merged anything we need to re-loop so we can | |
2672 | * get a good ref. | |
2673 | * Or we can get node references of the same type that weren't | |
2674 | * merged when created due to bumps in the tree mod seq, and | |
2675 | * we need to merge them to prevent adding an inline extent | |
2676 | * backref before dropping it (triggering a BUG_ON at | |
2677 | * insert_inline_extent_backref()). | |
2678 | */ | |
d7df2c79 | 2679 | spin_lock(&locked_ref->lock); |
be97f133 | 2680 | btrfs_merge_delayed_refs(trans, delayed_refs, locked_ref); |
ae1e206b | 2681 | |
0110a4c4 NB |
2682 | ret = btrfs_run_delayed_refs_for_head(trans, locked_ref, |
2683 | &actual_count); | |
2684 | if (ret < 0 && ret != -EAGAIN) { | |
2685 | /* | |
2686 | * Error, btrfs_run_delayed_refs_for_head already | |
2687 | * unlocked everything so just bail out | |
2688 | */ | |
2689 | return ret; | |
2690 | } else if (!ret) { | |
2691 | /* | |
2692 | * Success, perform the usual cleanup of a processed | |
2693 | * head | |
2694 | */ | |
f9871edd | 2695 | ret = cleanup_ref_head(trans, locked_ref); |
194ab0bc | 2696 | if (ret > 0 ) { |
b00e6250 JB |
2697 | /* We dropped our lock, we need to loop. */ |
2698 | ret = 0; | |
d7df2c79 | 2699 | continue; |
194ab0bc JB |
2700 | } else if (ret) { |
2701 | return ret; | |
5d4f98a2 | 2702 | } |
22cd2e7d | 2703 | } |
1ce7a5ec | 2704 | |
b00e6250 | 2705 | /* |
0110a4c4 NB |
2706 | * Either success case or btrfs_run_delayed_refs_for_head |
2707 | * returned -EAGAIN, meaning we need to select another head | |
b00e6250 | 2708 | */ |
b00e6250 | 2709 | |
0110a4c4 | 2710 | locked_ref = NULL; |
c3e69d58 | 2711 | cond_resched(); |
0110a4c4 | 2712 | } while ((nr != -1 && count < nr) || locked_ref); |
0a2b2a84 JB |
2713 | |
2714 | /* | |
2715 | * We don't want to include ref heads since we can have empty ref heads | |
2716 | * and those will drastically skew our runtime down since we just do | |
2717 | * accounting, no actual extent tree updates. | |
2718 | */ | |
2719 | if (actual_count > 0) { | |
2720 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); | |
2721 | u64 avg; | |
2722 | ||
2723 | /* | |
2724 | * We weigh the current average higher than our current runtime | |
2725 | * to avoid large swings in the average. | |
2726 | */ | |
2727 | spin_lock(&delayed_refs->lock); | |
2728 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; | |
f8c269d7 | 2729 | fs_info->avg_delayed_ref_runtime = avg >> 2; /* div by 4 */ |
0a2b2a84 JB |
2730 | spin_unlock(&delayed_refs->lock); |
2731 | } | |
d7df2c79 | 2732 | return 0; |
c3e69d58 CM |
2733 | } |
2734 | ||
709c0486 AJ |
2735 | #ifdef SCRAMBLE_DELAYED_REFS |
2736 | /* | |
2737 | * Normally delayed refs get processed in ascending bytenr order. This | |
2738 | * correlates in most cases to the order added. To expose dependencies on this | |
2739 | * order, we start to process the tree in the middle instead of the beginning | |
2740 | */ | |
2741 | static u64 find_middle(struct rb_root *root) | |
2742 | { | |
2743 | struct rb_node *n = root->rb_node; | |
2744 | struct btrfs_delayed_ref_node *entry; | |
2745 | int alt = 1; | |
2746 | u64 middle; | |
2747 | u64 first = 0, last = 0; | |
2748 | ||
2749 | n = rb_first(root); | |
2750 | if (n) { | |
2751 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2752 | first = entry->bytenr; | |
2753 | } | |
2754 | n = rb_last(root); | |
2755 | if (n) { | |
2756 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2757 | last = entry->bytenr; | |
2758 | } | |
2759 | n = root->rb_node; | |
2760 | ||
2761 | while (n) { | |
2762 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2763 | WARN_ON(!entry->in_tree); | |
2764 | ||
2765 | middle = entry->bytenr; | |
2766 | ||
2767 | if (alt) | |
2768 | n = n->rb_left; | |
2769 | else | |
2770 | n = n->rb_right; | |
2771 | ||
2772 | alt = 1 - alt; | |
2773 | } | |
2774 | return middle; | |
2775 | } | |
2776 | #endif | |
2777 | ||
2ff7e61e | 2778 | static inline u64 heads_to_leaves(struct btrfs_fs_info *fs_info, u64 heads) |
1be41b78 JB |
2779 | { |
2780 | u64 num_bytes; | |
2781 | ||
2782 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2783 | sizeof(struct btrfs_extent_inline_ref)); | |
0b246afa | 2784 | if (!btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
1be41b78 JB |
2785 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); |
2786 | ||
2787 | /* | |
2788 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
01327610 | 2789 | * closer to what we're really going to want to use. |
1be41b78 | 2790 | */ |
0b246afa | 2791 | return div_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(fs_info)); |
1be41b78 JB |
2792 | } |
2793 | ||
1262133b JB |
2794 | /* |
2795 | * Takes the number of bytes to be csumm'ed and figures out how many leaves it | |
2796 | * would require to store the csums for that many bytes. | |
2797 | */ | |
2ff7e61e | 2798 | u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes) |
1262133b JB |
2799 | { |
2800 | u64 csum_size; | |
2801 | u64 num_csums_per_leaf; | |
2802 | u64 num_csums; | |
2803 | ||
0b246afa | 2804 | csum_size = BTRFS_MAX_ITEM_SIZE(fs_info); |
1262133b | 2805 | num_csums_per_leaf = div64_u64(csum_size, |
0b246afa JM |
2806 | (u64)btrfs_super_csum_size(fs_info->super_copy)); |
2807 | num_csums = div64_u64(csum_bytes, fs_info->sectorsize); | |
1262133b JB |
2808 | num_csums += num_csums_per_leaf - 1; |
2809 | num_csums = div64_u64(num_csums, num_csums_per_leaf); | |
2810 | return num_csums; | |
2811 | } | |
2812 | ||
af9b8a0e | 2813 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans) |
1be41b78 | 2814 | { |
af9b8a0e | 2815 | struct btrfs_fs_info *fs_info = trans->fs_info; |
1be41b78 JB |
2816 | struct btrfs_block_rsv *global_rsv; |
2817 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
1262133b | 2818 | u64 csum_bytes = trans->transaction->delayed_refs.pending_csums; |
165c8b02 | 2819 | unsigned int num_dirty_bgs = trans->transaction->num_dirty_bgs; |
cb723e49 | 2820 | u64 num_bytes, num_dirty_bgs_bytes; |
1be41b78 JB |
2821 | int ret = 0; |
2822 | ||
0b246afa | 2823 | num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1); |
2ff7e61e | 2824 | num_heads = heads_to_leaves(fs_info, num_heads); |
1be41b78 | 2825 | if (num_heads > 1) |
0b246afa | 2826 | num_bytes += (num_heads - 1) * fs_info->nodesize; |
1be41b78 | 2827 | num_bytes <<= 1; |
2ff7e61e JM |
2828 | num_bytes += btrfs_csum_bytes_to_leaves(fs_info, csum_bytes) * |
2829 | fs_info->nodesize; | |
0b246afa | 2830 | num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(fs_info, |
cb723e49 | 2831 | num_dirty_bgs); |
0b246afa | 2832 | global_rsv = &fs_info->global_block_rsv; |
1be41b78 JB |
2833 | |
2834 | /* | |
2835 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2836 | * wiggle room since running delayed refs can create more delayed refs. | |
2837 | */ | |
cb723e49 JB |
2838 | if (global_rsv->space_info->full) { |
2839 | num_dirty_bgs_bytes <<= 1; | |
1be41b78 | 2840 | num_bytes <<= 1; |
cb723e49 | 2841 | } |
1be41b78 JB |
2842 | |
2843 | spin_lock(&global_rsv->lock); | |
cb723e49 | 2844 | if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes) |
1be41b78 JB |
2845 | ret = 1; |
2846 | spin_unlock(&global_rsv->lock); | |
2847 | return ret; | |
2848 | } | |
2849 | ||
7c861627 | 2850 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans) |
0a2b2a84 | 2851 | { |
0a2b2a84 JB |
2852 | u64 num_entries = |
2853 | atomic_read(&trans->transaction->delayed_refs.num_entries); | |
2854 | u64 avg_runtime; | |
a79b7d4b | 2855 | u64 val; |
0a2b2a84 JB |
2856 | |
2857 | smp_mb(); | |
7c861627 | 2858 | avg_runtime = trans->fs_info->avg_delayed_ref_runtime; |
a79b7d4b | 2859 | val = num_entries * avg_runtime; |
dc1a90c6 | 2860 | if (val >= NSEC_PER_SEC) |
0a2b2a84 | 2861 | return 1; |
a79b7d4b CM |
2862 | if (val >= NSEC_PER_SEC / 2) |
2863 | return 2; | |
0a2b2a84 | 2864 | |
af9b8a0e | 2865 | return btrfs_check_space_for_delayed_refs(trans); |
0a2b2a84 JB |
2866 | } |
2867 | ||
a79b7d4b CM |
2868 | struct async_delayed_refs { |
2869 | struct btrfs_root *root; | |
31b9655f | 2870 | u64 transid; |
a79b7d4b CM |
2871 | int count; |
2872 | int error; | |
2873 | int sync; | |
2874 | struct completion wait; | |
2875 | struct btrfs_work work; | |
2876 | }; | |
2877 | ||
2ff7e61e JM |
2878 | static inline struct async_delayed_refs * |
2879 | to_async_delayed_refs(struct btrfs_work *work) | |
2880 | { | |
2881 | return container_of(work, struct async_delayed_refs, work); | |
2882 | } | |
2883 | ||
a79b7d4b CM |
2884 | static void delayed_ref_async_start(struct btrfs_work *work) |
2885 | { | |
2ff7e61e | 2886 | struct async_delayed_refs *async = to_async_delayed_refs(work); |
a79b7d4b | 2887 | struct btrfs_trans_handle *trans; |
2ff7e61e | 2888 | struct btrfs_fs_info *fs_info = async->root->fs_info; |
a79b7d4b CM |
2889 | int ret; |
2890 | ||
0f873eca | 2891 | /* if the commit is already started, we don't need to wait here */ |
2ff7e61e | 2892 | if (btrfs_transaction_blocked(fs_info)) |
31b9655f | 2893 | goto done; |
31b9655f | 2894 | |
0f873eca CM |
2895 | trans = btrfs_join_transaction(async->root); |
2896 | if (IS_ERR(trans)) { | |
2897 | async->error = PTR_ERR(trans); | |
a79b7d4b CM |
2898 | goto done; |
2899 | } | |
2900 | ||
2901 | /* | |
01327610 | 2902 | * trans->sync means that when we call end_transaction, we won't |
a79b7d4b CM |
2903 | * wait on delayed refs |
2904 | */ | |
2905 | trans->sync = true; | |
0f873eca CM |
2906 | |
2907 | /* Don't bother flushing if we got into a different transaction */ | |
2908 | if (trans->transid > async->transid) | |
2909 | goto end; | |
2910 | ||
c79a70b1 | 2911 | ret = btrfs_run_delayed_refs(trans, async->count); |
a79b7d4b CM |
2912 | if (ret) |
2913 | async->error = ret; | |
0f873eca | 2914 | end: |
3a45bb20 | 2915 | ret = btrfs_end_transaction(trans); |
a79b7d4b CM |
2916 | if (ret && !async->error) |
2917 | async->error = ret; | |
2918 | done: | |
2919 | if (async->sync) | |
2920 | complete(&async->wait); | |
2921 | else | |
2922 | kfree(async); | |
2923 | } | |
2924 | ||
2ff7e61e | 2925 | int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info, |
31b9655f | 2926 | unsigned long count, u64 transid, int wait) |
a79b7d4b CM |
2927 | { |
2928 | struct async_delayed_refs *async; | |
2929 | int ret; | |
2930 | ||
2931 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
2932 | if (!async) | |
2933 | return -ENOMEM; | |
2934 | ||
0b246afa | 2935 | async->root = fs_info->tree_root; |
a79b7d4b CM |
2936 | async->count = count; |
2937 | async->error = 0; | |
31b9655f | 2938 | async->transid = transid; |
a79b7d4b CM |
2939 | if (wait) |
2940 | async->sync = 1; | |
2941 | else | |
2942 | async->sync = 0; | |
2943 | init_completion(&async->wait); | |
2944 | ||
9e0af237 LB |
2945 | btrfs_init_work(&async->work, btrfs_extent_refs_helper, |
2946 | delayed_ref_async_start, NULL, NULL); | |
a79b7d4b | 2947 | |
0b246afa | 2948 | btrfs_queue_work(fs_info->extent_workers, &async->work); |
a79b7d4b CM |
2949 | |
2950 | if (wait) { | |
2951 | wait_for_completion(&async->wait); | |
2952 | ret = async->error; | |
2953 | kfree(async); | |
2954 | return ret; | |
2955 | } | |
2956 | return 0; | |
2957 | } | |
2958 | ||
c3e69d58 CM |
2959 | /* |
2960 | * this starts processing the delayed reference count updates and | |
2961 | * extent insertions we have queued up so far. count can be | |
2962 | * 0, which means to process everything in the tree at the start | |
2963 | * of the run (but not newly added entries), or it can be some target | |
2964 | * number you'd like to process. | |
79787eaa JM |
2965 | * |
2966 | * Returns 0 on success or if called with an aborted transaction | |
2967 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2968 | */ |
2969 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
c79a70b1 | 2970 | unsigned long count) |
c3e69d58 | 2971 | { |
c79a70b1 | 2972 | struct btrfs_fs_info *fs_info = trans->fs_info; |
c3e69d58 CM |
2973 | struct rb_node *node; |
2974 | struct btrfs_delayed_ref_root *delayed_refs; | |
c46effa6 | 2975 | struct btrfs_delayed_ref_head *head; |
c3e69d58 CM |
2976 | int ret; |
2977 | int run_all = count == (unsigned long)-1; | |
c3e69d58 | 2978 | |
79787eaa JM |
2979 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2980 | if (trans->aborted) | |
2981 | return 0; | |
2982 | ||
0b246afa | 2983 | if (test_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags)) |
511711af CM |
2984 | return 0; |
2985 | ||
c3e69d58 | 2986 | delayed_refs = &trans->transaction->delayed_refs; |
26455d33 | 2987 | if (count == 0) |
d7df2c79 | 2988 | count = atomic_read(&delayed_refs->num_entries) * 2; |
bb721703 | 2989 | |
c3e69d58 | 2990 | again: |
709c0486 AJ |
2991 | #ifdef SCRAMBLE_DELAYED_REFS |
2992 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2993 | #endif | |
0a1e458a | 2994 | ret = __btrfs_run_delayed_refs(trans, count); |
d7df2c79 | 2995 | if (ret < 0) { |
66642832 | 2996 | btrfs_abort_transaction(trans, ret); |
d7df2c79 | 2997 | return ret; |
eb099670 | 2998 | } |
c3e69d58 | 2999 | |
56bec294 | 3000 | if (run_all) { |
d7df2c79 | 3001 | if (!list_empty(&trans->new_bgs)) |
6c686b35 | 3002 | btrfs_create_pending_block_groups(trans); |
ea658bad | 3003 | |
d7df2c79 | 3004 | spin_lock(&delayed_refs->lock); |
5c9d028b | 3005 | node = rb_first_cached(&delayed_refs->href_root); |
d7df2c79 JB |
3006 | if (!node) { |
3007 | spin_unlock(&delayed_refs->lock); | |
56bec294 | 3008 | goto out; |
d7df2c79 | 3009 | } |
d278850e JB |
3010 | head = rb_entry(node, struct btrfs_delayed_ref_head, |
3011 | href_node); | |
3012 | refcount_inc(&head->refs); | |
3013 | spin_unlock(&delayed_refs->lock); | |
e9d0b13b | 3014 | |
d278850e JB |
3015 | /* Mutex was contended, block until it's released and retry. */ |
3016 | mutex_lock(&head->mutex); | |
3017 | mutex_unlock(&head->mutex); | |
56bec294 | 3018 | |
d278850e | 3019 | btrfs_put_delayed_ref_head(head); |
d7df2c79 | 3020 | cond_resched(); |
56bec294 | 3021 | goto again; |
5f39d397 | 3022 | } |
54aa1f4d | 3023 | out: |
a28ec197 CM |
3024 | return 0; |
3025 | } | |
3026 | ||
5d4f98a2 | 3027 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2ff7e61e | 3028 | struct btrfs_fs_info *fs_info, |
5d4f98a2 | 3029 | u64 bytenr, u64 num_bytes, u64 flags, |
b1c79e09 | 3030 | int level, int is_data) |
5d4f98a2 YZ |
3031 | { |
3032 | struct btrfs_delayed_extent_op *extent_op; | |
3033 | int ret; | |
3034 | ||
78a6184a | 3035 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
3036 | if (!extent_op) |
3037 | return -ENOMEM; | |
3038 | ||
3039 | extent_op->flags_to_set = flags; | |
35b3ad50 DS |
3040 | extent_op->update_flags = true; |
3041 | extent_op->update_key = false; | |
3042 | extent_op->is_data = is_data ? true : false; | |
b1c79e09 | 3043 | extent_op->level = level; |
5d4f98a2 | 3044 | |
0b246afa | 3045 | ret = btrfs_add_delayed_extent_op(fs_info, trans, bytenr, |
66d7e7f0 | 3046 | num_bytes, extent_op); |
5d4f98a2 | 3047 | if (ret) |
78a6184a | 3048 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
3049 | return ret; |
3050 | } | |
3051 | ||
e4c3b2dc | 3052 | static noinline int check_delayed_ref(struct btrfs_root *root, |
5d4f98a2 YZ |
3053 | struct btrfs_path *path, |
3054 | u64 objectid, u64 offset, u64 bytenr) | |
3055 | { | |
3056 | struct btrfs_delayed_ref_head *head; | |
3057 | struct btrfs_delayed_ref_node *ref; | |
3058 | struct btrfs_delayed_data_ref *data_ref; | |
3059 | struct btrfs_delayed_ref_root *delayed_refs; | |
e4c3b2dc | 3060 | struct btrfs_transaction *cur_trans; |
0e0adbcf | 3061 | struct rb_node *node; |
5d4f98a2 YZ |
3062 | int ret = 0; |
3063 | ||
998ac6d2 | 3064 | spin_lock(&root->fs_info->trans_lock); |
e4c3b2dc | 3065 | cur_trans = root->fs_info->running_transaction; |
998ac6d2 | 3066 | if (cur_trans) |
3067 | refcount_inc(&cur_trans->use_count); | |
3068 | spin_unlock(&root->fs_info->trans_lock); | |
e4c3b2dc LB |
3069 | if (!cur_trans) |
3070 | return 0; | |
3071 | ||
3072 | delayed_refs = &cur_trans->delayed_refs; | |
5d4f98a2 | 3073 | spin_lock(&delayed_refs->lock); |
f72ad18e | 3074 | head = btrfs_find_delayed_ref_head(delayed_refs, bytenr); |
d7df2c79 JB |
3075 | if (!head) { |
3076 | spin_unlock(&delayed_refs->lock); | |
998ac6d2 | 3077 | btrfs_put_transaction(cur_trans); |
d7df2c79 JB |
3078 | return 0; |
3079 | } | |
5d4f98a2 YZ |
3080 | |
3081 | if (!mutex_trylock(&head->mutex)) { | |
d278850e | 3082 | refcount_inc(&head->refs); |
5d4f98a2 YZ |
3083 | spin_unlock(&delayed_refs->lock); |
3084 | ||
b3b4aa74 | 3085 | btrfs_release_path(path); |
5d4f98a2 | 3086 | |
8cc33e5c DS |
3087 | /* |
3088 | * Mutex was contended, block until it's released and let | |
3089 | * caller try again | |
3090 | */ | |
5d4f98a2 YZ |
3091 | mutex_lock(&head->mutex); |
3092 | mutex_unlock(&head->mutex); | |
d278850e | 3093 | btrfs_put_delayed_ref_head(head); |
998ac6d2 | 3094 | btrfs_put_transaction(cur_trans); |
5d4f98a2 YZ |
3095 | return -EAGAIN; |
3096 | } | |
d7df2c79 | 3097 | spin_unlock(&delayed_refs->lock); |
5d4f98a2 | 3098 | |
d7df2c79 | 3099 | spin_lock(&head->lock); |
0e0adbcf JB |
3100 | /* |
3101 | * XXX: We should replace this with a proper search function in the | |
3102 | * future. | |
3103 | */ | |
e3d03965 LB |
3104 | for (node = rb_first_cached(&head->ref_tree); node; |
3105 | node = rb_next(node)) { | |
0e0adbcf | 3106 | ref = rb_entry(node, struct btrfs_delayed_ref_node, ref_node); |
d7df2c79 JB |
3107 | /* If it's a shared ref we know a cross reference exists */ |
3108 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { | |
3109 | ret = 1; | |
3110 | break; | |
3111 | } | |
5d4f98a2 | 3112 | |
d7df2c79 | 3113 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
5d4f98a2 | 3114 | |
d7df2c79 JB |
3115 | /* |
3116 | * If our ref doesn't match the one we're currently looking at | |
3117 | * then we have a cross reference. | |
3118 | */ | |
3119 | if (data_ref->root != root->root_key.objectid || | |
3120 | data_ref->objectid != objectid || | |
3121 | data_ref->offset != offset) { | |
3122 | ret = 1; | |
3123 | break; | |
3124 | } | |
5d4f98a2 | 3125 | } |
d7df2c79 | 3126 | spin_unlock(&head->lock); |
5d4f98a2 | 3127 | mutex_unlock(&head->mutex); |
998ac6d2 | 3128 | btrfs_put_transaction(cur_trans); |
5d4f98a2 YZ |
3129 | return ret; |
3130 | } | |
3131 | ||
e4c3b2dc | 3132 | static noinline int check_committed_ref(struct btrfs_root *root, |
5d4f98a2 YZ |
3133 | struct btrfs_path *path, |
3134 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d | 3135 | { |
0b246afa JM |
3136 | struct btrfs_fs_info *fs_info = root->fs_info; |
3137 | struct btrfs_root *extent_root = fs_info->extent_root; | |
f321e491 | 3138 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
3139 | struct btrfs_extent_data_ref *ref; |
3140 | struct btrfs_extent_inline_ref *iref; | |
3141 | struct btrfs_extent_item *ei; | |
f321e491 | 3142 | struct btrfs_key key; |
5d4f98a2 | 3143 | u32 item_size; |
3de28d57 | 3144 | int type; |
be20aa9d | 3145 | int ret; |
925baedd | 3146 | |
be20aa9d | 3147 | key.objectid = bytenr; |
31840ae1 | 3148 | key.offset = (u64)-1; |
f321e491 | 3149 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 3150 | |
be20aa9d CM |
3151 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
3152 | if (ret < 0) | |
3153 | goto out; | |
79787eaa | 3154 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
3155 | |
3156 | ret = -ENOENT; | |
3157 | if (path->slots[0] == 0) | |
31840ae1 | 3158 | goto out; |
be20aa9d | 3159 | |
31840ae1 | 3160 | path->slots[0]--; |
f321e491 | 3161 | leaf = path->nodes[0]; |
5d4f98a2 | 3162 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 3163 | |
5d4f98a2 | 3164 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 3165 | goto out; |
f321e491 | 3166 | |
5d4f98a2 YZ |
3167 | ret = 1; |
3168 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
5d4f98a2 | 3169 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
bd09835d | 3170 | |
5d4f98a2 YZ |
3171 | if (item_size != sizeof(*ei) + |
3172 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
3173 | goto out; | |
be20aa9d | 3174 | |
5d4f98a2 YZ |
3175 | if (btrfs_extent_generation(leaf, ei) <= |
3176 | btrfs_root_last_snapshot(&root->root_item)) | |
3177 | goto out; | |
3178 | ||
3179 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
3de28d57 LB |
3180 | |
3181 | type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA); | |
3182 | if (type != BTRFS_EXTENT_DATA_REF_KEY) | |
5d4f98a2 YZ |
3183 | goto out; |
3184 | ||
3185 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
3186 | if (btrfs_extent_refs(leaf, ei) != | |
3187 | btrfs_extent_data_ref_count(leaf, ref) || | |
3188 | btrfs_extent_data_ref_root(leaf, ref) != | |
3189 | root->root_key.objectid || | |
3190 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
3191 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
3192 | goto out; | |
3193 | ||
3194 | ret = 0; | |
3195 | out: | |
3196 | return ret; | |
3197 | } | |
3198 | ||
e4c3b2dc LB |
3199 | int btrfs_cross_ref_exist(struct btrfs_root *root, u64 objectid, u64 offset, |
3200 | u64 bytenr) | |
5d4f98a2 YZ |
3201 | { |
3202 | struct btrfs_path *path; | |
3203 | int ret; | |
5d4f98a2 YZ |
3204 | |
3205 | path = btrfs_alloc_path(); | |
3206 | if (!path) | |
9132c4ff | 3207 | return -ENOMEM; |
5d4f98a2 YZ |
3208 | |
3209 | do { | |
e4c3b2dc | 3210 | ret = check_committed_ref(root, path, objectid, |
5d4f98a2 YZ |
3211 | offset, bytenr); |
3212 | if (ret && ret != -ENOENT) | |
f321e491 | 3213 | goto out; |
80ff3856 | 3214 | |
380fd066 MT |
3215 | ret = check_delayed_ref(root, path, objectid, offset, bytenr); |
3216 | } while (ret == -EAGAIN); | |
5d4f98a2 | 3217 | |
be20aa9d | 3218 | out: |
80ff3856 | 3219 | btrfs_free_path(path); |
f0486c68 YZ |
3220 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
3221 | WARN_ON(ret > 0); | |
f321e491 | 3222 | return ret; |
be20aa9d | 3223 | } |
c5739bba | 3224 | |
5d4f98a2 | 3225 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 3226 | struct btrfs_root *root, |
5d4f98a2 | 3227 | struct extent_buffer *buf, |
e339a6b0 | 3228 | int full_backref, int inc) |
31840ae1 | 3229 | { |
0b246afa | 3230 | struct btrfs_fs_info *fs_info = root->fs_info; |
31840ae1 | 3231 | u64 bytenr; |
5d4f98a2 YZ |
3232 | u64 num_bytes; |
3233 | u64 parent; | |
31840ae1 | 3234 | u64 ref_root; |
31840ae1 | 3235 | u32 nritems; |
31840ae1 ZY |
3236 | struct btrfs_key key; |
3237 | struct btrfs_file_extent_item *fi; | |
3238 | int i; | |
3239 | int level; | |
3240 | int ret = 0; | |
2ff7e61e | 3241 | int (*process_func)(struct btrfs_trans_handle *, |
84f7d8e6 | 3242 | struct btrfs_root *, |
b06c4bf5 | 3243 | u64, u64, u64, u64, u64, u64); |
31840ae1 | 3244 | |
fccb84c9 | 3245 | |
0b246afa | 3246 | if (btrfs_is_testing(fs_info)) |
faa2dbf0 | 3247 | return 0; |
fccb84c9 | 3248 | |
31840ae1 | 3249 | ref_root = btrfs_header_owner(buf); |
31840ae1 ZY |
3250 | nritems = btrfs_header_nritems(buf); |
3251 | level = btrfs_header_level(buf); | |
3252 | ||
27cdeb70 | 3253 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0) |
5d4f98a2 | 3254 | return 0; |
31840ae1 | 3255 | |
5d4f98a2 YZ |
3256 | if (inc) |
3257 | process_func = btrfs_inc_extent_ref; | |
3258 | else | |
3259 | process_func = btrfs_free_extent; | |
31840ae1 | 3260 | |
5d4f98a2 YZ |
3261 | if (full_backref) |
3262 | parent = buf->start; | |
3263 | else | |
3264 | parent = 0; | |
3265 | ||
3266 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 3267 | if (level == 0) { |
5d4f98a2 | 3268 | btrfs_item_key_to_cpu(buf, &key, i); |
962a298f | 3269 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
31840ae1 | 3270 | continue; |
5d4f98a2 | 3271 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3272 | struct btrfs_file_extent_item); |
3273 | if (btrfs_file_extent_type(buf, fi) == | |
3274 | BTRFS_FILE_EXTENT_INLINE) | |
3275 | continue; | |
3276 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3277 | if (bytenr == 0) | |
3278 | continue; | |
5d4f98a2 YZ |
3279 | |
3280 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3281 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
84f7d8e6 | 3282 | ret = process_func(trans, root, bytenr, num_bytes, |
5d4f98a2 | 3283 | parent, ref_root, key.objectid, |
b06c4bf5 | 3284 | key.offset); |
31840ae1 ZY |
3285 | if (ret) |
3286 | goto fail; | |
3287 | } else { | |
5d4f98a2 | 3288 | bytenr = btrfs_node_blockptr(buf, i); |
0b246afa | 3289 | num_bytes = fs_info->nodesize; |
84f7d8e6 | 3290 | ret = process_func(trans, root, bytenr, num_bytes, |
b06c4bf5 | 3291 | parent, ref_root, level - 1, 0); |
31840ae1 ZY |
3292 | if (ret) |
3293 | goto fail; | |
3294 | } | |
3295 | } | |
3296 | return 0; | |
3297 | fail: | |
5d4f98a2 YZ |
3298 | return ret; |
3299 | } | |
3300 | ||
3301 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
e339a6b0 | 3302 | struct extent_buffer *buf, int full_backref) |
5d4f98a2 | 3303 | { |
e339a6b0 | 3304 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); |
5d4f98a2 YZ |
3305 | } |
3306 | ||
3307 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
e339a6b0 | 3308 | struct extent_buffer *buf, int full_backref) |
5d4f98a2 | 3309 | { |
e339a6b0 | 3310 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); |
31840ae1 ZY |
3311 | } |
3312 | ||
9078a3e1 | 3313 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2ff7e61e | 3314 | struct btrfs_fs_info *fs_info, |
9078a3e1 CM |
3315 | struct btrfs_path *path, |
3316 | struct btrfs_block_group_cache *cache) | |
3317 | { | |
3318 | int ret; | |
0b246afa | 3319 | struct btrfs_root *extent_root = fs_info->extent_root; |
5f39d397 CM |
3320 | unsigned long bi; |
3321 | struct extent_buffer *leaf; | |
9078a3e1 | 3322 | |
9078a3e1 | 3323 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
df95e7f0 JB |
3324 | if (ret) { |
3325 | if (ret > 0) | |
3326 | ret = -ENOENT; | |
54aa1f4d | 3327 | goto fail; |
df95e7f0 | 3328 | } |
5f39d397 CM |
3329 | |
3330 | leaf = path->nodes[0]; | |
3331 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3332 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3333 | btrfs_mark_buffer_dirty(leaf); | |
54aa1f4d | 3334 | fail: |
24b89d08 | 3335 | btrfs_release_path(path); |
df95e7f0 | 3336 | return ret; |
9078a3e1 CM |
3337 | |
3338 | } | |
3339 | ||
4a8c9a62 | 3340 | static struct btrfs_block_group_cache * |
2ff7e61e | 3341 | next_block_group(struct btrfs_fs_info *fs_info, |
4a8c9a62 YZ |
3342 | struct btrfs_block_group_cache *cache) |
3343 | { | |
3344 | struct rb_node *node; | |
292cbd51 | 3345 | |
0b246afa | 3346 | spin_lock(&fs_info->block_group_cache_lock); |
292cbd51 FM |
3347 | |
3348 | /* If our block group was removed, we need a full search. */ | |
3349 | if (RB_EMPTY_NODE(&cache->cache_node)) { | |
3350 | const u64 next_bytenr = cache->key.objectid + cache->key.offset; | |
3351 | ||
0b246afa | 3352 | spin_unlock(&fs_info->block_group_cache_lock); |
292cbd51 | 3353 | btrfs_put_block_group(cache); |
0b246afa | 3354 | cache = btrfs_lookup_first_block_group(fs_info, next_bytenr); return cache; |
292cbd51 | 3355 | } |
4a8c9a62 YZ |
3356 | node = rb_next(&cache->cache_node); |
3357 | btrfs_put_block_group(cache); | |
3358 | if (node) { | |
3359 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3360 | cache_node); | |
11dfe35a | 3361 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3362 | } else |
3363 | cache = NULL; | |
0b246afa | 3364 | spin_unlock(&fs_info->block_group_cache_lock); |
4a8c9a62 YZ |
3365 | return cache; |
3366 | } | |
3367 | ||
0af3d00b JB |
3368 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3369 | struct btrfs_trans_handle *trans, | |
3370 | struct btrfs_path *path) | |
3371 | { | |
0b246afa JM |
3372 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
3373 | struct btrfs_root *root = fs_info->tree_root; | |
0af3d00b | 3374 | struct inode *inode = NULL; |
364ecf36 | 3375 | struct extent_changeset *data_reserved = NULL; |
0af3d00b | 3376 | u64 alloc_hint = 0; |
2b20982e | 3377 | int dcs = BTRFS_DC_ERROR; |
f8c269d7 | 3378 | u64 num_pages = 0; |
0af3d00b JB |
3379 | int retries = 0; |
3380 | int ret = 0; | |
3381 | ||
3382 | /* | |
3383 | * If this block group is smaller than 100 megs don't bother caching the | |
3384 | * block group. | |
3385 | */ | |
ee22184b | 3386 | if (block_group->key.offset < (100 * SZ_1M)) { |
0af3d00b JB |
3387 | spin_lock(&block_group->lock); |
3388 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3389 | spin_unlock(&block_group->lock); | |
3390 | return 0; | |
3391 | } | |
3392 | ||
0c0ef4bc JB |
3393 | if (trans->aborted) |
3394 | return 0; | |
0af3d00b | 3395 | again: |
77ab86bf | 3396 | inode = lookup_free_space_inode(fs_info, block_group, path); |
0af3d00b JB |
3397 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { |
3398 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3399 | btrfs_release_path(path); |
0af3d00b JB |
3400 | goto out; |
3401 | } | |
3402 | ||
3403 | if (IS_ERR(inode)) { | |
3404 | BUG_ON(retries); | |
3405 | retries++; | |
3406 | ||
3407 | if (block_group->ro) | |
3408 | goto out_free; | |
3409 | ||
77ab86bf JM |
3410 | ret = create_free_space_inode(fs_info, trans, block_group, |
3411 | path); | |
0af3d00b JB |
3412 | if (ret) |
3413 | goto out_free; | |
3414 | goto again; | |
3415 | } | |
3416 | ||
3417 | /* | |
3418 | * We want to set the generation to 0, that way if anything goes wrong | |
3419 | * from here on out we know not to trust this cache when we load up next | |
3420 | * time. | |
3421 | */ | |
3422 | BTRFS_I(inode)->generation = 0; | |
3423 | ret = btrfs_update_inode(trans, root, inode); | |
0c0ef4bc JB |
3424 | if (ret) { |
3425 | /* | |
3426 | * So theoretically we could recover from this, simply set the | |
3427 | * super cache generation to 0 so we know to invalidate the | |
3428 | * cache, but then we'd have to keep track of the block groups | |
3429 | * that fail this way so we know we _have_ to reset this cache | |
3430 | * before the next commit or risk reading stale cache. So to | |
3431 | * limit our exposure to horrible edge cases lets just abort the | |
3432 | * transaction, this only happens in really bad situations | |
3433 | * anyway. | |
3434 | */ | |
66642832 | 3435 | btrfs_abort_transaction(trans, ret); |
0c0ef4bc JB |
3436 | goto out_put; |
3437 | } | |
0af3d00b JB |
3438 | WARN_ON(ret); |
3439 | ||
8e138e0d JB |
3440 | /* We've already setup this transaction, go ahead and exit */ |
3441 | if (block_group->cache_generation == trans->transid && | |
3442 | i_size_read(inode)) { | |
3443 | dcs = BTRFS_DC_SETUP; | |
3444 | goto out_put; | |
3445 | } | |
3446 | ||
0af3d00b | 3447 | if (i_size_read(inode) > 0) { |
2ff7e61e | 3448 | ret = btrfs_check_trunc_cache_free_space(fs_info, |
0b246afa | 3449 | &fs_info->global_block_rsv); |
7b61cd92 MX |
3450 | if (ret) |
3451 | goto out_put; | |
3452 | ||
77ab86bf | 3453 | ret = btrfs_truncate_free_space_cache(trans, NULL, inode); |
0af3d00b JB |
3454 | if (ret) |
3455 | goto out_put; | |
3456 | } | |
3457 | ||
3458 | spin_lock(&block_group->lock); | |
cf7c1ef6 | 3459 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
0b246afa | 3460 | !btrfs_test_opt(fs_info, SPACE_CACHE)) { |
cf7c1ef6 LB |
3461 | /* |
3462 | * don't bother trying to write stuff out _if_ | |
3463 | * a) we're not cached, | |
1a79c1f2 LB |
3464 | * b) we're with nospace_cache mount option, |
3465 | * c) we're with v2 space_cache (FREE_SPACE_TREE). | |
cf7c1ef6 | 3466 | */ |
2b20982e | 3467 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3468 | spin_unlock(&block_group->lock); |
3469 | goto out_put; | |
3470 | } | |
3471 | spin_unlock(&block_group->lock); | |
3472 | ||
2968b1f4 JB |
3473 | /* |
3474 | * We hit an ENOSPC when setting up the cache in this transaction, just | |
3475 | * skip doing the setup, we've already cleared the cache so we're safe. | |
3476 | */ | |
3477 | if (test_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags)) { | |
3478 | ret = -ENOSPC; | |
3479 | goto out_put; | |
3480 | } | |
3481 | ||
6fc823b1 JB |
3482 | /* |
3483 | * Try to preallocate enough space based on how big the block group is. | |
3484 | * Keep in mind this has to include any pinned space which could end up | |
3485 | * taking up quite a bit since it's not folded into the other space | |
3486 | * cache. | |
3487 | */ | |
ee22184b | 3488 | num_pages = div_u64(block_group->key.offset, SZ_256M); |
0af3d00b JB |
3489 | if (!num_pages) |
3490 | num_pages = 1; | |
3491 | ||
0af3d00b | 3492 | num_pages *= 16; |
09cbfeaf | 3493 | num_pages *= PAGE_SIZE; |
0af3d00b | 3494 | |
364ecf36 | 3495 | ret = btrfs_check_data_free_space(inode, &data_reserved, 0, num_pages); |
0af3d00b JB |
3496 | if (ret) |
3497 | goto out_put; | |
3498 | ||
3499 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3500 | num_pages, num_pages, | |
3501 | &alloc_hint); | |
2968b1f4 JB |
3502 | /* |
3503 | * Our cache requires contiguous chunks so that we don't modify a bunch | |
3504 | * of metadata or split extents when writing the cache out, which means | |
3505 | * we can enospc if we are heavily fragmented in addition to just normal | |
3506 | * out of space conditions. So if we hit this just skip setting up any | |
3507 | * other block groups for this transaction, maybe we'll unpin enough | |
3508 | * space the next time around. | |
3509 | */ | |
2b20982e JB |
3510 | if (!ret) |
3511 | dcs = BTRFS_DC_SETUP; | |
2968b1f4 JB |
3512 | else if (ret == -ENOSPC) |
3513 | set_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags); | |
c09544e0 | 3514 | |
0af3d00b JB |
3515 | out_put: |
3516 | iput(inode); | |
3517 | out_free: | |
b3b4aa74 | 3518 | btrfs_release_path(path); |
0af3d00b JB |
3519 | out: |
3520 | spin_lock(&block_group->lock); | |
e65cbb94 | 3521 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3522 | block_group->cache_generation = trans->transid; |
2b20982e | 3523 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3524 | spin_unlock(&block_group->lock); |
3525 | ||
364ecf36 | 3526 | extent_changeset_free(data_reserved); |
0af3d00b JB |
3527 | return ret; |
3528 | } | |
3529 | ||
dcdf7f6d | 3530 | int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, |
2ff7e61e | 3531 | struct btrfs_fs_info *fs_info) |
dcdf7f6d JB |
3532 | { |
3533 | struct btrfs_block_group_cache *cache, *tmp; | |
3534 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3535 | struct btrfs_path *path; | |
3536 | ||
3537 | if (list_empty(&cur_trans->dirty_bgs) || | |
0b246afa | 3538 | !btrfs_test_opt(fs_info, SPACE_CACHE)) |
dcdf7f6d JB |
3539 | return 0; |
3540 | ||
3541 | path = btrfs_alloc_path(); | |
3542 | if (!path) | |
3543 | return -ENOMEM; | |
3544 | ||
3545 | /* Could add new block groups, use _safe just in case */ | |
3546 | list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs, | |
3547 | dirty_list) { | |
3548 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3549 | cache_save_setup(cache, trans, path); | |
3550 | } | |
3551 | ||
3552 | btrfs_free_path(path); | |
3553 | return 0; | |
3554 | } | |
3555 | ||
1bbc621e CM |
3556 | /* |
3557 | * transaction commit does final block group cache writeback during a | |
3558 | * critical section where nothing is allowed to change the FS. This is | |
3559 | * required in order for the cache to actually match the block group, | |
3560 | * but can introduce a lot of latency into the commit. | |
3561 | * | |
3562 | * So, btrfs_start_dirty_block_groups is here to kick off block group | |
3563 | * cache IO. There's a chance we'll have to redo some of it if the | |
3564 | * block group changes again during the commit, but it greatly reduces | |
3565 | * the commit latency by getting rid of the easy block groups while | |
3566 | * we're still allowing others to join the commit. | |
3567 | */ | |
21217054 | 3568 | int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans) |
9078a3e1 | 3569 | { |
21217054 | 3570 | struct btrfs_fs_info *fs_info = trans->fs_info; |
4a8c9a62 | 3571 | struct btrfs_block_group_cache *cache; |
ce93ec54 JB |
3572 | struct btrfs_transaction *cur_trans = trans->transaction; |
3573 | int ret = 0; | |
c9dc4c65 | 3574 | int should_put; |
1bbc621e CM |
3575 | struct btrfs_path *path = NULL; |
3576 | LIST_HEAD(dirty); | |
3577 | struct list_head *io = &cur_trans->io_bgs; | |
c9dc4c65 | 3578 | int num_started = 0; |
1bbc621e CM |
3579 | int loops = 0; |
3580 | ||
3581 | spin_lock(&cur_trans->dirty_bgs_lock); | |
b58d1a9e FM |
3582 | if (list_empty(&cur_trans->dirty_bgs)) { |
3583 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3584 | return 0; | |
1bbc621e | 3585 | } |
b58d1a9e | 3586 | list_splice_init(&cur_trans->dirty_bgs, &dirty); |
1bbc621e | 3587 | spin_unlock(&cur_trans->dirty_bgs_lock); |
ce93ec54 | 3588 | |
1bbc621e | 3589 | again: |
1bbc621e CM |
3590 | /* |
3591 | * make sure all the block groups on our dirty list actually | |
3592 | * exist | |
3593 | */ | |
6c686b35 | 3594 | btrfs_create_pending_block_groups(trans); |
1bbc621e CM |
3595 | |
3596 | if (!path) { | |
3597 | path = btrfs_alloc_path(); | |
3598 | if (!path) | |
3599 | return -ENOMEM; | |
3600 | } | |
3601 | ||
b58d1a9e FM |
3602 | /* |
3603 | * cache_write_mutex is here only to save us from balance or automatic | |
3604 | * removal of empty block groups deleting this block group while we are | |
3605 | * writing out the cache | |
3606 | */ | |
3607 | mutex_lock(&trans->transaction->cache_write_mutex); | |
1bbc621e CM |
3608 | while (!list_empty(&dirty)) { |
3609 | cache = list_first_entry(&dirty, | |
3610 | struct btrfs_block_group_cache, | |
3611 | dirty_list); | |
1bbc621e CM |
3612 | /* |
3613 | * this can happen if something re-dirties a block | |
3614 | * group that is already under IO. Just wait for it to | |
3615 | * finish and then do it all again | |
3616 | */ | |
3617 | if (!list_empty(&cache->io_list)) { | |
3618 | list_del_init(&cache->io_list); | |
afdb5718 | 3619 | btrfs_wait_cache_io(trans, cache, path); |
1bbc621e CM |
3620 | btrfs_put_block_group(cache); |
3621 | } | |
3622 | ||
3623 | ||
3624 | /* | |
3625 | * btrfs_wait_cache_io uses the cache->dirty_list to decide | |
3626 | * if it should update the cache_state. Don't delete | |
3627 | * until after we wait. | |
3628 | * | |
3629 | * Since we're not running in the commit critical section | |
3630 | * we need the dirty_bgs_lock to protect from update_block_group | |
3631 | */ | |
3632 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3633 | list_del_init(&cache->dirty_list); | |
3634 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3635 | ||
3636 | should_put = 1; | |
3637 | ||
3638 | cache_save_setup(cache, trans, path); | |
3639 | ||
3640 | if (cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3641 | cache->io_ctl.inode = NULL; | |
0b246afa | 3642 | ret = btrfs_write_out_cache(fs_info, trans, |
5b4aacef | 3643 | cache, path); |
1bbc621e CM |
3644 | if (ret == 0 && cache->io_ctl.inode) { |
3645 | num_started++; | |
3646 | should_put = 0; | |
3647 | ||
3648 | /* | |
45ae2c18 NB |
3649 | * The cache_write_mutex is protecting the |
3650 | * io_list, also refer to the definition of | |
3651 | * btrfs_transaction::io_bgs for more details | |
1bbc621e CM |
3652 | */ |
3653 | list_add_tail(&cache->io_list, io); | |
3654 | } else { | |
3655 | /* | |
3656 | * if we failed to write the cache, the | |
3657 | * generation will be bad and life goes on | |
3658 | */ | |
3659 | ret = 0; | |
3660 | } | |
3661 | } | |
ff1f8250 | 3662 | if (!ret) { |
2ff7e61e JM |
3663 | ret = write_one_cache_group(trans, fs_info, |
3664 | path, cache); | |
ff1f8250 FM |
3665 | /* |
3666 | * Our block group might still be attached to the list | |
3667 | * of new block groups in the transaction handle of some | |
3668 | * other task (struct btrfs_trans_handle->new_bgs). This | |
3669 | * means its block group item isn't yet in the extent | |
3670 | * tree. If this happens ignore the error, as we will | |
3671 | * try again later in the critical section of the | |
3672 | * transaction commit. | |
3673 | */ | |
3674 | if (ret == -ENOENT) { | |
3675 | ret = 0; | |
3676 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3677 | if (list_empty(&cache->dirty_list)) { | |
3678 | list_add_tail(&cache->dirty_list, | |
3679 | &cur_trans->dirty_bgs); | |
3680 | btrfs_get_block_group(cache); | |
3681 | } | |
3682 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3683 | } else if (ret) { | |
66642832 | 3684 | btrfs_abort_transaction(trans, ret); |
ff1f8250 FM |
3685 | } |
3686 | } | |
1bbc621e CM |
3687 | |
3688 | /* if its not on the io list, we need to put the block group */ | |
3689 | if (should_put) | |
3690 | btrfs_put_block_group(cache); | |
3691 | ||
3692 | if (ret) | |
3693 | break; | |
b58d1a9e FM |
3694 | |
3695 | /* | |
3696 | * Avoid blocking other tasks for too long. It might even save | |
3697 | * us from writing caches for block groups that are going to be | |
3698 | * removed. | |
3699 | */ | |
3700 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
3701 | mutex_lock(&trans->transaction->cache_write_mutex); | |
1bbc621e | 3702 | } |
b58d1a9e | 3703 | mutex_unlock(&trans->transaction->cache_write_mutex); |
1bbc621e CM |
3704 | |
3705 | /* | |
3706 | * go through delayed refs for all the stuff we've just kicked off | |
3707 | * and then loop back (just once) | |
3708 | */ | |
c79a70b1 | 3709 | ret = btrfs_run_delayed_refs(trans, 0); |
1bbc621e CM |
3710 | if (!ret && loops == 0) { |
3711 | loops++; | |
3712 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3713 | list_splice_init(&cur_trans->dirty_bgs, &dirty); | |
b58d1a9e FM |
3714 | /* |
3715 | * dirty_bgs_lock protects us from concurrent block group | |
3716 | * deletes too (not just cache_write_mutex). | |
3717 | */ | |
3718 | if (!list_empty(&dirty)) { | |
3719 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3720 | goto again; | |
3721 | } | |
1bbc621e | 3722 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c79a1751 | 3723 | } else if (ret < 0) { |
2ff7e61e | 3724 | btrfs_cleanup_dirty_bgs(cur_trans, fs_info); |
1bbc621e CM |
3725 | } |
3726 | ||
3727 | btrfs_free_path(path); | |
3728 | return ret; | |
3729 | } | |
3730 | ||
3731 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, | |
2ff7e61e | 3732 | struct btrfs_fs_info *fs_info) |
1bbc621e CM |
3733 | { |
3734 | struct btrfs_block_group_cache *cache; | |
3735 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3736 | int ret = 0; | |
3737 | int should_put; | |
3738 | struct btrfs_path *path; | |
3739 | struct list_head *io = &cur_trans->io_bgs; | |
3740 | int num_started = 0; | |
9078a3e1 CM |
3741 | |
3742 | path = btrfs_alloc_path(); | |
3743 | if (!path) | |
3744 | return -ENOMEM; | |
3745 | ||
ce93ec54 | 3746 | /* |
e44081ef FM |
3747 | * Even though we are in the critical section of the transaction commit, |
3748 | * we can still have concurrent tasks adding elements to this | |
3749 | * transaction's list of dirty block groups. These tasks correspond to | |
3750 | * endio free space workers started when writeback finishes for a | |
3751 | * space cache, which run inode.c:btrfs_finish_ordered_io(), and can | |
3752 | * allocate new block groups as a result of COWing nodes of the root | |
3753 | * tree when updating the free space inode. The writeback for the space | |
3754 | * caches is triggered by an earlier call to | |
3755 | * btrfs_start_dirty_block_groups() and iterations of the following | |
3756 | * loop. | |
3757 | * Also we want to do the cache_save_setup first and then run the | |
ce93ec54 JB |
3758 | * delayed refs to make sure we have the best chance at doing this all |
3759 | * in one shot. | |
3760 | */ | |
e44081ef | 3761 | spin_lock(&cur_trans->dirty_bgs_lock); |
ce93ec54 JB |
3762 | while (!list_empty(&cur_trans->dirty_bgs)) { |
3763 | cache = list_first_entry(&cur_trans->dirty_bgs, | |
3764 | struct btrfs_block_group_cache, | |
3765 | dirty_list); | |
c9dc4c65 CM |
3766 | |
3767 | /* | |
3768 | * this can happen if cache_save_setup re-dirties a block | |
3769 | * group that is already under IO. Just wait for it to | |
3770 | * finish and then do it all again | |
3771 | */ | |
3772 | if (!list_empty(&cache->io_list)) { | |
e44081ef | 3773 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 | 3774 | list_del_init(&cache->io_list); |
afdb5718 | 3775 | btrfs_wait_cache_io(trans, cache, path); |
c9dc4c65 | 3776 | btrfs_put_block_group(cache); |
e44081ef | 3777 | spin_lock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 CM |
3778 | } |
3779 | ||
1bbc621e CM |
3780 | /* |
3781 | * don't remove from the dirty list until after we've waited | |
3782 | * on any pending IO | |
3783 | */ | |
ce93ec54 | 3784 | list_del_init(&cache->dirty_list); |
e44081ef | 3785 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 CM |
3786 | should_put = 1; |
3787 | ||
1bbc621e | 3788 | cache_save_setup(cache, trans, path); |
c9dc4c65 | 3789 | |
ce93ec54 | 3790 | if (!ret) |
c79a70b1 | 3791 | ret = btrfs_run_delayed_refs(trans, |
2ff7e61e | 3792 | (unsigned long) -1); |
c9dc4c65 CM |
3793 | |
3794 | if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3795 | cache->io_ctl.inode = NULL; | |
0b246afa | 3796 | ret = btrfs_write_out_cache(fs_info, trans, |
5b4aacef | 3797 | cache, path); |
c9dc4c65 CM |
3798 | if (ret == 0 && cache->io_ctl.inode) { |
3799 | num_started++; | |
3800 | should_put = 0; | |
1bbc621e | 3801 | list_add_tail(&cache->io_list, io); |
c9dc4c65 CM |
3802 | } else { |
3803 | /* | |
3804 | * if we failed to write the cache, the | |
3805 | * generation will be bad and life goes on | |
3806 | */ | |
3807 | ret = 0; | |
3808 | } | |
3809 | } | |
ff1f8250 | 3810 | if (!ret) { |
2ff7e61e JM |
3811 | ret = write_one_cache_group(trans, fs_info, |
3812 | path, cache); | |
2bc0bb5f FM |
3813 | /* |
3814 | * One of the free space endio workers might have | |
3815 | * created a new block group while updating a free space | |
3816 | * cache's inode (at inode.c:btrfs_finish_ordered_io()) | |
3817 | * and hasn't released its transaction handle yet, in | |
3818 | * which case the new block group is still attached to | |
3819 | * its transaction handle and its creation has not | |
3820 | * finished yet (no block group item in the extent tree | |
3821 | * yet, etc). If this is the case, wait for all free | |
3822 | * space endio workers to finish and retry. This is a | |
3823 | * a very rare case so no need for a more efficient and | |
3824 | * complex approach. | |
3825 | */ | |
3826 | if (ret == -ENOENT) { | |
3827 | wait_event(cur_trans->writer_wait, | |
3828 | atomic_read(&cur_trans->num_writers) == 1); | |
2ff7e61e JM |
3829 | ret = write_one_cache_group(trans, fs_info, |
3830 | path, cache); | |
2bc0bb5f | 3831 | } |
ff1f8250 | 3832 | if (ret) |
66642832 | 3833 | btrfs_abort_transaction(trans, ret); |
ff1f8250 | 3834 | } |
c9dc4c65 CM |
3835 | |
3836 | /* if its not on the io list, we need to put the block group */ | |
3837 | if (should_put) | |
3838 | btrfs_put_block_group(cache); | |
e44081ef | 3839 | spin_lock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 | 3840 | } |
e44081ef | 3841 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 | 3842 | |
45ae2c18 NB |
3843 | /* |
3844 | * Refer to the definition of io_bgs member for details why it's safe | |
3845 | * to use it without any locking | |
3846 | */ | |
1bbc621e CM |
3847 | while (!list_empty(io)) { |
3848 | cache = list_first_entry(io, struct btrfs_block_group_cache, | |
c9dc4c65 CM |
3849 | io_list); |
3850 | list_del_init(&cache->io_list); | |
afdb5718 | 3851 | btrfs_wait_cache_io(trans, cache, path); |
0cb59c99 JB |
3852 | btrfs_put_block_group(cache); |
3853 | } | |
3854 | ||
9078a3e1 | 3855 | btrfs_free_path(path); |
ce93ec54 | 3856 | return ret; |
9078a3e1 CM |
3857 | } |
3858 | ||
2ff7e61e | 3859 | int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr) |
d2fb3437 YZ |
3860 | { |
3861 | struct btrfs_block_group_cache *block_group; | |
3862 | int readonly = 0; | |
3863 | ||
0b246afa | 3864 | block_group = btrfs_lookup_block_group(fs_info, bytenr); |
d2fb3437 YZ |
3865 | if (!block_group || block_group->ro) |
3866 | readonly = 1; | |
3867 | if (block_group) | |
fa9c0d79 | 3868 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3869 | return readonly; |
3870 | } | |
3871 | ||
f78c436c FM |
3872 | bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr) |
3873 | { | |
3874 | struct btrfs_block_group_cache *bg; | |
3875 | bool ret = true; | |
3876 | ||
3877 | bg = btrfs_lookup_block_group(fs_info, bytenr); | |
3878 | if (!bg) | |
3879 | return false; | |
3880 | ||
3881 | spin_lock(&bg->lock); | |
3882 | if (bg->ro) | |
3883 | ret = false; | |
3884 | else | |
3885 | atomic_inc(&bg->nocow_writers); | |
3886 | spin_unlock(&bg->lock); | |
3887 | ||
3888 | /* no put on block group, done by btrfs_dec_nocow_writers */ | |
3889 | if (!ret) | |
3890 | btrfs_put_block_group(bg); | |
3891 | ||
3892 | return ret; | |
3893 | ||
3894 | } | |
3895 | ||
3896 | void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr) | |
3897 | { | |
3898 | struct btrfs_block_group_cache *bg; | |
3899 | ||
3900 | bg = btrfs_lookup_block_group(fs_info, bytenr); | |
3901 | ASSERT(bg); | |
3902 | if (atomic_dec_and_test(&bg->nocow_writers)) | |
4625956a | 3903 | wake_up_var(&bg->nocow_writers); |
f78c436c FM |
3904 | /* |
3905 | * Once for our lookup and once for the lookup done by a previous call | |
3906 | * to btrfs_inc_nocow_writers() | |
3907 | */ | |
3908 | btrfs_put_block_group(bg); | |
3909 | btrfs_put_block_group(bg); | |
3910 | } | |
3911 | ||
f78c436c FM |
3912 | void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg) |
3913 | { | |
4625956a | 3914 | wait_var_event(&bg->nocow_writers, !atomic_read(&bg->nocow_writers)); |
f78c436c FM |
3915 | } |
3916 | ||
6ab0a202 JM |
3917 | static const char *alloc_name(u64 flags) |
3918 | { | |
3919 | switch (flags) { | |
3920 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: | |
3921 | return "mixed"; | |
3922 | case BTRFS_BLOCK_GROUP_METADATA: | |
3923 | return "metadata"; | |
3924 | case BTRFS_BLOCK_GROUP_DATA: | |
3925 | return "data"; | |
3926 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
3927 | return "system"; | |
3928 | default: | |
3929 | WARN_ON(1); | |
3930 | return "invalid-combination"; | |
3931 | }; | |
3932 | } | |
3933 | ||
4ca61683 | 3934 | static int create_space_info(struct btrfs_fs_info *info, u64 flags) |
2be12ef7 NB |
3935 | { |
3936 | ||
3937 | struct btrfs_space_info *space_info; | |
3938 | int i; | |
3939 | int ret; | |
3940 | ||
3941 | space_info = kzalloc(sizeof(*space_info), GFP_NOFS); | |
3942 | if (!space_info) | |
3943 | return -ENOMEM; | |
3944 | ||
3945 | ret = percpu_counter_init(&space_info->total_bytes_pinned, 0, | |
3946 | GFP_KERNEL); | |
3947 | if (ret) { | |
3948 | kfree(space_info); | |
3949 | return ret; | |
3950 | } | |
3951 | ||
3952 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
3953 | INIT_LIST_HEAD(&space_info->block_groups[i]); | |
3954 | init_rwsem(&space_info->groups_sem); | |
3955 | spin_lock_init(&space_info->lock); | |
3956 | space_info->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; | |
3957 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; | |
3958 | init_waitqueue_head(&space_info->wait); | |
3959 | INIT_LIST_HEAD(&space_info->ro_bgs); | |
3960 | INIT_LIST_HEAD(&space_info->tickets); | |
3961 | INIT_LIST_HEAD(&space_info->priority_tickets); | |
3962 | ||
3963 | ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, | |
3964 | info->space_info_kobj, "%s", | |
3965 | alloc_name(space_info->flags)); | |
3966 | if (ret) { | |
3967 | percpu_counter_destroy(&space_info->total_bytes_pinned); | |
3968 | kfree(space_info); | |
3969 | return ret; | |
3970 | } | |
3971 | ||
2be12ef7 NB |
3972 | list_add_rcu(&space_info->list, &info->space_info); |
3973 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3974 | info->data_sinfo = space_info; | |
3975 | ||
3976 | return ret; | |
3977 | } | |
3978 | ||
d2006e6d | 3979 | static void update_space_info(struct btrfs_fs_info *info, u64 flags, |
593060d7 | 3980 | u64 total_bytes, u64 bytes_used, |
e40edf2d | 3981 | u64 bytes_readonly, |
593060d7 CM |
3982 | struct btrfs_space_info **space_info) |
3983 | { | |
3984 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3985 | int factor; |
3986 | ||
46df06b8 | 3987 | factor = btrfs_bg_type_to_factor(flags); |
593060d7 CM |
3988 | |
3989 | found = __find_space_info(info, flags); | |
d2006e6d NB |
3990 | ASSERT(found); |
3991 | spin_lock(&found->lock); | |
3992 | found->total_bytes += total_bytes; | |
3993 | found->disk_total += total_bytes * factor; | |
3994 | found->bytes_used += bytes_used; | |
3995 | found->disk_used += bytes_used * factor; | |
3996 | found->bytes_readonly += bytes_readonly; | |
3997 | if (total_bytes > 0) | |
3998 | found->full = 0; | |
3999 | space_info_add_new_bytes(info, found, total_bytes - | |
4000 | bytes_used - bytes_readonly); | |
4001 | spin_unlock(&found->lock); | |
4002 | *space_info = found; | |
593060d7 CM |
4003 | } |
4004 | ||
8790d502 CM |
4005 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
4006 | { | |
899c81ea ID |
4007 | u64 extra_flags = chunk_to_extended(flags) & |
4008 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 4009 | |
de98ced9 | 4010 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
4011 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
4012 | fs_info->avail_data_alloc_bits |= extra_flags; | |
4013 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
4014 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
4015 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
4016 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 4017 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 4018 | } |
593060d7 | 4019 | |
fc67c450 ID |
4020 | /* |
4021 | * returns target flags in extended format or 0 if restripe for this | |
4022 | * chunk_type is not in progress | |
c6664b42 | 4023 | * |
dccdb07b | 4024 | * should be called with balance_lock held |
fc67c450 ID |
4025 | */ |
4026 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
4027 | { | |
4028 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
4029 | u64 target = 0; | |
4030 | ||
fc67c450 ID |
4031 | if (!bctl) |
4032 | return 0; | |
4033 | ||
4034 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
4035 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
4036 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
4037 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
4038 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
4039 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
4040 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
4041 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
4042 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
4043 | } | |
4044 | ||
4045 | return target; | |
4046 | } | |
4047 | ||
a46d11a8 ID |
4048 | /* |
4049 | * @flags: available profiles in extended format (see ctree.h) | |
4050 | * | |
e4d8ec0f ID |
4051 | * Returns reduced profile in chunk format. If profile changing is in |
4052 | * progress (either running or paused) picks the target profile (if it's | |
4053 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 4054 | */ |
2ff7e61e | 4055 | static u64 btrfs_reduce_alloc_profile(struct btrfs_fs_info *fs_info, u64 flags) |
ec44a35c | 4056 | { |
0b246afa | 4057 | u64 num_devices = fs_info->fs_devices->rw_devices; |
fc67c450 | 4058 | u64 target; |
9c170b26 ZL |
4059 | u64 raid_type; |
4060 | u64 allowed = 0; | |
a061fc8d | 4061 | |
fc67c450 ID |
4062 | /* |
4063 | * see if restripe for this chunk_type is in progress, if so | |
4064 | * try to reduce to the target profile | |
4065 | */ | |
0b246afa JM |
4066 | spin_lock(&fs_info->balance_lock); |
4067 | target = get_restripe_target(fs_info, flags); | |
fc67c450 ID |
4068 | if (target) { |
4069 | /* pick target profile only if it's already available */ | |
4070 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
0b246afa | 4071 | spin_unlock(&fs_info->balance_lock); |
fc67c450 | 4072 | return extended_to_chunk(target); |
e4d8ec0f ID |
4073 | } |
4074 | } | |
0b246afa | 4075 | spin_unlock(&fs_info->balance_lock); |
e4d8ec0f | 4076 | |
53b381b3 | 4077 | /* First, mask out the RAID levels which aren't possible */ |
9c170b26 ZL |
4078 | for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) { |
4079 | if (num_devices >= btrfs_raid_array[raid_type].devs_min) | |
41a6e891 | 4080 | allowed |= btrfs_raid_array[raid_type].bg_flag; |
9c170b26 ZL |
4081 | } |
4082 | allowed &= flags; | |
4083 | ||
4084 | if (allowed & BTRFS_BLOCK_GROUP_RAID6) | |
4085 | allowed = BTRFS_BLOCK_GROUP_RAID6; | |
4086 | else if (allowed & BTRFS_BLOCK_GROUP_RAID5) | |
4087 | allowed = BTRFS_BLOCK_GROUP_RAID5; | |
4088 | else if (allowed & BTRFS_BLOCK_GROUP_RAID10) | |
4089 | allowed = BTRFS_BLOCK_GROUP_RAID10; | |
4090 | else if (allowed & BTRFS_BLOCK_GROUP_RAID1) | |
4091 | allowed = BTRFS_BLOCK_GROUP_RAID1; | |
4092 | else if (allowed & BTRFS_BLOCK_GROUP_RAID0) | |
4093 | allowed = BTRFS_BLOCK_GROUP_RAID0; | |
4094 | ||
4095 | flags &= ~BTRFS_BLOCK_GROUP_PROFILE_MASK; | |
4096 | ||
4097 | return extended_to_chunk(flags | allowed); | |
ec44a35c CM |
4098 | } |
4099 | ||
2ff7e61e | 4100 | static u64 get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags) |
6a63209f | 4101 | { |
de98ced9 | 4102 | unsigned seq; |
f8213bdc | 4103 | u64 flags; |
de98ced9 MX |
4104 | |
4105 | do { | |
f8213bdc | 4106 | flags = orig_flags; |
0b246afa | 4107 | seq = read_seqbegin(&fs_info->profiles_lock); |
de98ced9 MX |
4108 | |
4109 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
0b246afa | 4110 | flags |= fs_info->avail_data_alloc_bits; |
de98ced9 | 4111 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
0b246afa | 4112 | flags |= fs_info->avail_system_alloc_bits; |
de98ced9 | 4113 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) |
0b246afa JM |
4114 | flags |= fs_info->avail_metadata_alloc_bits; |
4115 | } while (read_seqretry(&fs_info->profiles_lock, seq)); | |
6fef8df1 | 4116 | |
2ff7e61e | 4117 | return btrfs_reduce_alloc_profile(fs_info, flags); |
6a63209f JB |
4118 | } |
4119 | ||
1b86826d | 4120 | static u64 get_alloc_profile_by_root(struct btrfs_root *root, int data) |
9ed74f2d | 4121 | { |
0b246afa | 4122 | struct btrfs_fs_info *fs_info = root->fs_info; |
b742bb82 | 4123 | u64 flags; |
53b381b3 | 4124 | u64 ret; |
9ed74f2d | 4125 | |
b742bb82 YZ |
4126 | if (data) |
4127 | flags = BTRFS_BLOCK_GROUP_DATA; | |
0b246afa | 4128 | else if (root == fs_info->chunk_root) |
b742bb82 | 4129 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
9ed74f2d | 4130 | else |
b742bb82 | 4131 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 4132 | |
2ff7e61e | 4133 | ret = get_alloc_profile(fs_info, flags); |
53b381b3 | 4134 | return ret; |
6a63209f | 4135 | } |
9ed74f2d | 4136 | |
1b86826d JM |
4137 | u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info) |
4138 | { | |
4139 | return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA); | |
4140 | } | |
4141 | ||
4142 | u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info) | |
4143 | { | |
4144 | return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
4145 | } | |
4146 | ||
4147 | u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info) | |
4148 | { | |
4149 | return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
4150 | } | |
4151 | ||
4136135b LB |
4152 | static u64 btrfs_space_info_used(struct btrfs_space_info *s_info, |
4153 | bool may_use_included) | |
4154 | { | |
4155 | ASSERT(s_info); | |
4156 | return s_info->bytes_used + s_info->bytes_reserved + | |
4157 | s_info->bytes_pinned + s_info->bytes_readonly + | |
4158 | (may_use_included ? s_info->bytes_may_use : 0); | |
4159 | } | |
4160 | ||
04f4f916 | 4161 | int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes) |
6a63209f | 4162 | { |
04f4f916 | 4163 | struct btrfs_root *root = inode->root; |
b4d7c3c9 | 4164 | struct btrfs_fs_info *fs_info = root->fs_info; |
1174cade | 4165 | struct btrfs_space_info *data_sinfo = fs_info->data_sinfo; |
ab6e2410 | 4166 | u64 used; |
94b947b2 | 4167 | int ret = 0; |
c99f1b0c ZL |
4168 | int need_commit = 2; |
4169 | int have_pinned_space; | |
6a63209f | 4170 | |
6a63209f | 4171 | /* make sure bytes are sectorsize aligned */ |
0b246afa | 4172 | bytes = ALIGN(bytes, fs_info->sectorsize); |
6a63209f | 4173 | |
9dced186 | 4174 | if (btrfs_is_free_space_inode(inode)) { |
c99f1b0c | 4175 | need_commit = 0; |
9dced186 | 4176 | ASSERT(current->journal_info); |
0af3d00b JB |
4177 | } |
4178 | ||
6a63209f JB |
4179 | again: |
4180 | /* make sure we have enough space to handle the data first */ | |
4181 | spin_lock(&data_sinfo->lock); | |
4136135b | 4182 | used = btrfs_space_info_used(data_sinfo, true); |
ab6e2410 JB |
4183 | |
4184 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 4185 | struct btrfs_trans_handle *trans; |
9ed74f2d | 4186 | |
6a63209f JB |
4187 | /* |
4188 | * if we don't have enough free bytes in this space then we need | |
4189 | * to alloc a new chunk. | |
4190 | */ | |
b9fd47cd | 4191 | if (!data_sinfo->full) { |
6a63209f | 4192 | u64 alloc_target; |
9ed74f2d | 4193 | |
0e4f8f88 | 4194 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 4195 | spin_unlock(&data_sinfo->lock); |
1174cade | 4196 | |
1b86826d | 4197 | alloc_target = btrfs_data_alloc_profile(fs_info); |
9dced186 MX |
4198 | /* |
4199 | * It is ugly that we don't call nolock join | |
4200 | * transaction for the free space inode case here. | |
4201 | * But it is safe because we only do the data space | |
4202 | * reservation for the free space cache in the | |
4203 | * transaction context, the common join transaction | |
4204 | * just increase the counter of the current transaction | |
4205 | * handler, doesn't try to acquire the trans_lock of | |
4206 | * the fs. | |
4207 | */ | |
7a7eaa40 | 4208 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
4209 | if (IS_ERR(trans)) |
4210 | return PTR_ERR(trans); | |
9ed74f2d | 4211 | |
01458828 | 4212 | ret = do_chunk_alloc(trans, alloc_target, |
0e4f8f88 | 4213 | CHUNK_ALLOC_NO_FORCE); |
3a45bb20 | 4214 | btrfs_end_transaction(trans); |
d52a5b5f MX |
4215 | if (ret < 0) { |
4216 | if (ret != -ENOSPC) | |
4217 | return ret; | |
c99f1b0c ZL |
4218 | else { |
4219 | have_pinned_space = 1; | |
d52a5b5f | 4220 | goto commit_trans; |
c99f1b0c | 4221 | } |
d52a5b5f | 4222 | } |
9ed74f2d | 4223 | |
6a63209f JB |
4224 | goto again; |
4225 | } | |
f2bb8f5c JB |
4226 | |
4227 | /* | |
b150a4f1 | 4228 | * If we don't have enough pinned space to deal with this |
94b947b2 ZL |
4229 | * allocation, and no removed chunk in current transaction, |
4230 | * don't bother committing the transaction. | |
f2bb8f5c | 4231 | */ |
dec59fa3 | 4232 | have_pinned_space = __percpu_counter_compare( |
c99f1b0c | 4233 | &data_sinfo->total_bytes_pinned, |
dec59fa3 EL |
4234 | used + bytes - data_sinfo->total_bytes, |
4235 | BTRFS_TOTAL_BYTES_PINNED_BATCH); | |
6a63209f | 4236 | spin_unlock(&data_sinfo->lock); |
6a63209f | 4237 | |
4e06bdd6 | 4238 | /* commit the current transaction and try again */ |
d52a5b5f | 4239 | commit_trans: |
92e2f7e3 | 4240 | if (need_commit) { |
c99f1b0c | 4241 | need_commit--; |
b150a4f1 | 4242 | |
e1746e83 | 4243 | if (need_commit > 0) { |
82b3e53b | 4244 | btrfs_start_delalloc_roots(fs_info, -1); |
6374e57a | 4245 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, |
0b246afa | 4246 | (u64)-1); |
e1746e83 | 4247 | } |
9a4e7276 | 4248 | |
7a7eaa40 | 4249 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
4250 | if (IS_ERR(trans)) |
4251 | return PTR_ERR(trans); | |
c99f1b0c | 4252 | if (have_pinned_space >= 0 || |
3204d33c JB |
4253 | test_bit(BTRFS_TRANS_HAVE_FREE_BGS, |
4254 | &trans->transaction->flags) || | |
c99f1b0c | 4255 | need_commit > 0) { |
3a45bb20 | 4256 | ret = btrfs_commit_transaction(trans); |
94b947b2 ZL |
4257 | if (ret) |
4258 | return ret; | |
d7c15171 | 4259 | /* |
c2d6cb16 FM |
4260 | * The cleaner kthread might still be doing iput |
4261 | * operations. Wait for it to finish so that | |
4262 | * more space is released. | |
d7c15171 | 4263 | */ |
0b246afa JM |
4264 | mutex_lock(&fs_info->cleaner_delayed_iput_mutex); |
4265 | mutex_unlock(&fs_info->cleaner_delayed_iput_mutex); | |
94b947b2 ZL |
4266 | goto again; |
4267 | } else { | |
3a45bb20 | 4268 | btrfs_end_transaction(trans); |
94b947b2 | 4269 | } |
4e06bdd6 | 4270 | } |
9ed74f2d | 4271 | |
0b246afa | 4272 | trace_btrfs_space_reservation(fs_info, |
cab45e22 JM |
4273 | "space_info:enospc", |
4274 | data_sinfo->flags, bytes, 1); | |
6a63209f JB |
4275 | return -ENOSPC; |
4276 | } | |
9f9b8e8d | 4277 | update_bytes_may_use(data_sinfo, bytes); |
0b246afa | 4278 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4279 | data_sinfo->flags, bytes, 1); |
6a63209f | 4280 | spin_unlock(&data_sinfo->lock); |
6a63209f | 4281 | |
4559b0a7 | 4282 | return 0; |
9ed74f2d | 4283 | } |
6a63209f | 4284 | |
364ecf36 QW |
4285 | int btrfs_check_data_free_space(struct inode *inode, |
4286 | struct extent_changeset **reserved, u64 start, u64 len) | |
4ceff079 | 4287 | { |
0b246afa | 4288 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
4ceff079 QW |
4289 | int ret; |
4290 | ||
4291 | /* align the range */ | |
0b246afa JM |
4292 | len = round_up(start + len, fs_info->sectorsize) - |
4293 | round_down(start, fs_info->sectorsize); | |
4294 | start = round_down(start, fs_info->sectorsize); | |
4ceff079 | 4295 | |
04f4f916 | 4296 | ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode), len); |
4ceff079 QW |
4297 | if (ret < 0) |
4298 | return ret; | |
4299 | ||
1e5ec2e7 | 4300 | /* Use new btrfs_qgroup_reserve_data to reserve precious data space. */ |
364ecf36 | 4301 | ret = btrfs_qgroup_reserve_data(inode, reserved, start, len); |
7bc329c1 | 4302 | if (ret < 0) |
1e5ec2e7 | 4303 | btrfs_free_reserved_data_space_noquota(inode, start, len); |
364ecf36 QW |
4304 | else |
4305 | ret = 0; | |
4ceff079 QW |
4306 | return ret; |
4307 | } | |
4308 | ||
4ceff079 QW |
4309 | /* |
4310 | * Called if we need to clear a data reservation for this inode | |
4311 | * Normally in a error case. | |
4312 | * | |
51773bec QW |
4313 | * This one will *NOT* use accurate qgroup reserved space API, just for case |
4314 | * which we can't sleep and is sure it won't affect qgroup reserved space. | |
4315 | * Like clear_bit_hook(). | |
4ceff079 | 4316 | */ |
51773bec QW |
4317 | void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start, |
4318 | u64 len) | |
4ceff079 | 4319 | { |
0b246afa | 4320 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
4ceff079 QW |
4321 | struct btrfs_space_info *data_sinfo; |
4322 | ||
4323 | /* Make sure the range is aligned to sectorsize */ | |
0b246afa JM |
4324 | len = round_up(start + len, fs_info->sectorsize) - |
4325 | round_down(start, fs_info->sectorsize); | |
4326 | start = round_down(start, fs_info->sectorsize); | |
4ceff079 | 4327 | |
0b246afa | 4328 | data_sinfo = fs_info->data_sinfo; |
4ceff079 | 4329 | spin_lock(&data_sinfo->lock); |
9f9b8e8d | 4330 | update_bytes_may_use(data_sinfo, -len); |
0b246afa | 4331 | trace_btrfs_space_reservation(fs_info, "space_info", |
4ceff079 QW |
4332 | data_sinfo->flags, len, 0); |
4333 | spin_unlock(&data_sinfo->lock); | |
4334 | } | |
4335 | ||
51773bec QW |
4336 | /* |
4337 | * Called if we need to clear a data reservation for this inode | |
4338 | * Normally in a error case. | |
4339 | * | |
01327610 | 4340 | * This one will handle the per-inode data rsv map for accurate reserved |
51773bec QW |
4341 | * space framework. |
4342 | */ | |
bc42bda2 QW |
4343 | void btrfs_free_reserved_data_space(struct inode *inode, |
4344 | struct extent_changeset *reserved, u64 start, u64 len) | |
51773bec | 4345 | { |
0c476a5d JM |
4346 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4347 | ||
4348 | /* Make sure the range is aligned to sectorsize */ | |
da17066c JM |
4349 | len = round_up(start + len, root->fs_info->sectorsize) - |
4350 | round_down(start, root->fs_info->sectorsize); | |
4351 | start = round_down(start, root->fs_info->sectorsize); | |
0c476a5d | 4352 | |
51773bec | 4353 | btrfs_free_reserved_data_space_noquota(inode, start, len); |
bc42bda2 | 4354 | btrfs_qgroup_free_data(inode, reserved, start, len); |
51773bec QW |
4355 | } |
4356 | ||
97e728d4 | 4357 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 4358 | { |
97e728d4 JB |
4359 | struct list_head *head = &info->space_info; |
4360 | struct btrfs_space_info *found; | |
e3ccfa98 | 4361 | |
97e728d4 JB |
4362 | rcu_read_lock(); |
4363 | list_for_each_entry_rcu(found, head, list) { | |
4364 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 4365 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 4366 | } |
97e728d4 | 4367 | rcu_read_unlock(); |
e3ccfa98 JB |
4368 | } |
4369 | ||
3c76cd84 MX |
4370 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
4371 | { | |
4372 | return (global->size << 1); | |
4373 | } | |
4374 | ||
2ff7e61e | 4375 | static int should_alloc_chunk(struct btrfs_fs_info *fs_info, |
698d0082 | 4376 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 4377 | { |
0b246afa | 4378 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
8d8aafee | 4379 | u64 bytes_used = btrfs_space_info_used(sinfo, false); |
e5bc2458 | 4380 | u64 thresh; |
e3ccfa98 | 4381 | |
0e4f8f88 CM |
4382 | if (force == CHUNK_ALLOC_FORCE) |
4383 | return 1; | |
4384 | ||
fb25e914 JB |
4385 | /* |
4386 | * We need to take into account the global rsv because for all intents | |
4387 | * and purposes it's used space. Don't worry about locking the | |
4388 | * global_rsv, it doesn't change except when the transaction commits. | |
4389 | */ | |
54338b5c | 4390 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
8d8aafee | 4391 | bytes_used += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 4392 | |
0e4f8f88 CM |
4393 | /* |
4394 | * in limited mode, we want to have some free space up to | |
4395 | * about 1% of the FS size. | |
4396 | */ | |
4397 | if (force == CHUNK_ALLOC_LIMITED) { | |
0b246afa | 4398 | thresh = btrfs_super_total_bytes(fs_info->super_copy); |
ee22184b | 4399 | thresh = max_t(u64, SZ_64M, div_factor_fine(thresh, 1)); |
0e4f8f88 | 4400 | |
8d8aafee | 4401 | if (sinfo->total_bytes - bytes_used < thresh) |
0e4f8f88 CM |
4402 | return 1; |
4403 | } | |
0e4f8f88 | 4404 | |
8d8aafee | 4405 | if (bytes_used + SZ_2M < div_factor(sinfo->total_bytes, 8)) |
14ed0ca6 | 4406 | return 0; |
424499db | 4407 | return 1; |
32c00aff JB |
4408 | } |
4409 | ||
2ff7e61e | 4410 | static u64 get_profile_num_devs(struct btrfs_fs_info *fs_info, u64 type) |
15d1ff81 LB |
4411 | { |
4412 | u64 num_dev; | |
4413 | ||
53b381b3 DW |
4414 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
4415 | BTRFS_BLOCK_GROUP_RAID0 | | |
4416 | BTRFS_BLOCK_GROUP_RAID5 | | |
4417 | BTRFS_BLOCK_GROUP_RAID6)) | |
0b246afa | 4418 | num_dev = fs_info->fs_devices->rw_devices; |
15d1ff81 LB |
4419 | else if (type & BTRFS_BLOCK_GROUP_RAID1) |
4420 | num_dev = 2; | |
4421 | else | |
4422 | num_dev = 1; /* DUP or single */ | |
4423 | ||
39c2d7fa | 4424 | return num_dev; |
15d1ff81 LB |
4425 | } |
4426 | ||
39c2d7fa FM |
4427 | /* |
4428 | * If @is_allocation is true, reserve space in the system space info necessary | |
4429 | * for allocating a chunk, otherwise if it's false, reserve space necessary for | |
4430 | * removing a chunk. | |
4431 | */ | |
451a2c13 | 4432 | void check_system_chunk(struct btrfs_trans_handle *trans, u64 type) |
15d1ff81 | 4433 | { |
451a2c13 | 4434 | struct btrfs_fs_info *fs_info = trans->fs_info; |
15d1ff81 LB |
4435 | struct btrfs_space_info *info; |
4436 | u64 left; | |
4437 | u64 thresh; | |
4fbcdf66 | 4438 | int ret = 0; |
39c2d7fa | 4439 | u64 num_devs; |
4fbcdf66 FM |
4440 | |
4441 | /* | |
4442 | * Needed because we can end up allocating a system chunk and for an | |
4443 | * atomic and race free space reservation in the chunk block reserve. | |
4444 | */ | |
a32bf9a3 | 4445 | lockdep_assert_held(&fs_info->chunk_mutex); |
15d1ff81 | 4446 | |
0b246afa | 4447 | info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
15d1ff81 | 4448 | spin_lock(&info->lock); |
4136135b | 4449 | left = info->total_bytes - btrfs_space_info_used(info, true); |
15d1ff81 LB |
4450 | spin_unlock(&info->lock); |
4451 | ||
2ff7e61e | 4452 | num_devs = get_profile_num_devs(fs_info, type); |
39c2d7fa FM |
4453 | |
4454 | /* num_devs device items to update and 1 chunk item to add or remove */ | |
0b246afa JM |
4455 | thresh = btrfs_calc_trunc_metadata_size(fs_info, num_devs) + |
4456 | btrfs_calc_trans_metadata_size(fs_info, 1); | |
39c2d7fa | 4457 | |
0b246afa JM |
4458 | if (left < thresh && btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
4459 | btrfs_info(fs_info, "left=%llu, need=%llu, flags=%llu", | |
4460 | left, thresh, type); | |
4461 | dump_space_info(fs_info, info, 0, 0); | |
15d1ff81 LB |
4462 | } |
4463 | ||
4464 | if (left < thresh) { | |
1b86826d | 4465 | u64 flags = btrfs_system_alloc_profile(fs_info); |
15d1ff81 | 4466 | |
4fbcdf66 FM |
4467 | /* |
4468 | * Ignore failure to create system chunk. We might end up not | |
4469 | * needing it, as we might not need to COW all nodes/leafs from | |
4470 | * the paths we visit in the chunk tree (they were already COWed | |
4471 | * or created in the current transaction for example). | |
4472 | */ | |
c216b203 | 4473 | ret = btrfs_alloc_chunk(trans, flags); |
4fbcdf66 FM |
4474 | } |
4475 | ||
4476 | if (!ret) { | |
0b246afa JM |
4477 | ret = btrfs_block_rsv_add(fs_info->chunk_root, |
4478 | &fs_info->chunk_block_rsv, | |
4fbcdf66 FM |
4479 | thresh, BTRFS_RESERVE_NO_FLUSH); |
4480 | if (!ret) | |
4481 | trans->chunk_bytes_reserved += thresh; | |
15d1ff81 LB |
4482 | } |
4483 | } | |
4484 | ||
28b737f6 LB |
4485 | /* |
4486 | * If force is CHUNK_ALLOC_FORCE: | |
4487 | * - return 1 if it successfully allocates a chunk, | |
4488 | * - return errors including -ENOSPC otherwise. | |
4489 | * If force is NOT CHUNK_ALLOC_FORCE: | |
4490 | * - return 0 if it doesn't need to allocate a new chunk, | |
4491 | * - return 1 if it successfully allocates a chunk, | |
4492 | * - return errors including -ENOSPC otherwise. | |
4493 | */ | |
01458828 NB |
4494 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags, |
4495 | int force) | |
9ed74f2d | 4496 | { |
01458828 | 4497 | struct btrfs_fs_info *fs_info = trans->fs_info; |
6324fbf3 | 4498 | struct btrfs_space_info *space_info; |
2556fbb0 NB |
4499 | bool wait_for_alloc = false; |
4500 | bool should_alloc = false; | |
9ed74f2d | 4501 | int ret = 0; |
9ed74f2d | 4502 | |
c6b305a8 JB |
4503 | /* Don't re-enter if we're already allocating a chunk */ |
4504 | if (trans->allocating_chunk) | |
4505 | return -ENOSPC; | |
4506 | ||
0b246afa | 4507 | space_info = __find_space_info(fs_info, flags); |
dc2d3005 | 4508 | ASSERT(space_info); |
9ed74f2d | 4509 | |
2556fbb0 NB |
4510 | do { |
4511 | spin_lock(&space_info->lock); | |
4512 | if (force < space_info->force_alloc) | |
4513 | force = space_info->force_alloc; | |
4514 | should_alloc = should_alloc_chunk(fs_info, space_info, force); | |
4515 | if (space_info->full) { | |
4516 | /* No more free physical space */ | |
4517 | if (should_alloc) | |
4518 | ret = -ENOSPC; | |
4519 | else | |
4520 | ret = 0; | |
4521 | spin_unlock(&space_info->lock); | |
4522 | return ret; | |
4523 | } else if (!should_alloc) { | |
4524 | spin_unlock(&space_info->lock); | |
4525 | return 0; | |
4526 | } else if (space_info->chunk_alloc) { | |
4527 | /* | |
4528 | * Someone is already allocating, so we need to block | |
4529 | * until this someone is finished and then loop to | |
4530 | * recheck if we should continue with our allocation | |
4531 | * attempt. | |
4532 | */ | |
4533 | wait_for_alloc = true; | |
4534 | spin_unlock(&space_info->lock); | |
4535 | mutex_lock(&fs_info->chunk_mutex); | |
4536 | mutex_unlock(&fs_info->chunk_mutex); | |
4537 | } else { | |
4538 | /* Proceed with allocation */ | |
4539 | space_info->chunk_alloc = 1; | |
4540 | wait_for_alloc = false; | |
4541 | spin_unlock(&space_info->lock); | |
4542 | } | |
6d74119f | 4543 | |
1e1c50a9 | 4544 | cond_resched(); |
2556fbb0 | 4545 | } while (wait_for_alloc); |
6d74119f | 4546 | |
2556fbb0 | 4547 | mutex_lock(&fs_info->chunk_mutex); |
c6b305a8 JB |
4548 | trans->allocating_chunk = true; |
4549 | ||
67377734 JB |
4550 | /* |
4551 | * If we have mixed data/metadata chunks we want to make sure we keep | |
4552 | * allocating mixed chunks instead of individual chunks. | |
4553 | */ | |
4554 | if (btrfs_mixed_space_info(space_info)) | |
4555 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
4556 | ||
97e728d4 JB |
4557 | /* |
4558 | * if we're doing a data chunk, go ahead and make sure that | |
4559 | * we keep a reasonable number of metadata chunks allocated in the | |
4560 | * FS as well. | |
4561 | */ | |
9ed74f2d | 4562 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
4563 | fs_info->data_chunk_allocations++; |
4564 | if (!(fs_info->data_chunk_allocations % | |
4565 | fs_info->metadata_ratio)) | |
4566 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
4567 | } |
4568 | ||
15d1ff81 LB |
4569 | /* |
4570 | * Check if we have enough space in SYSTEM chunk because we may need | |
4571 | * to update devices. | |
4572 | */ | |
451a2c13 | 4573 | check_system_chunk(trans, flags); |
15d1ff81 | 4574 | |
c216b203 | 4575 | ret = btrfs_alloc_chunk(trans, flags); |
c6b305a8 | 4576 | trans->allocating_chunk = false; |
92b8e897 | 4577 | |
9ed74f2d | 4578 | spin_lock(&space_info->lock); |
57f1642e NB |
4579 | if (ret < 0) { |
4580 | if (ret == -ENOSPC) | |
4581 | space_info->full = 1; | |
4582 | else | |
4583 | goto out; | |
4584 | } else { | |
424499db | 4585 | ret = 1; |
21a94f7a | 4586 | space_info->max_extent_size = 0; |
57f1642e | 4587 | } |
6d74119f | 4588 | |
0e4f8f88 | 4589 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 4590 | out: |
6d74119f | 4591 | space_info->chunk_alloc = 0; |
9ed74f2d | 4592 | spin_unlock(&space_info->lock); |
a25c75d5 | 4593 | mutex_unlock(&fs_info->chunk_mutex); |
00d80e34 FM |
4594 | /* |
4595 | * When we allocate a new chunk we reserve space in the chunk block | |
4596 | * reserve to make sure we can COW nodes/leafs in the chunk tree or | |
4597 | * add new nodes/leafs to it if we end up needing to do it when | |
4598 | * inserting the chunk item and updating device items as part of the | |
4599 | * second phase of chunk allocation, performed by | |
4600 | * btrfs_finish_chunk_alloc(). So make sure we don't accumulate a | |
4601 | * large number of new block groups to create in our transaction | |
4602 | * handle's new_bgs list to avoid exhausting the chunk block reserve | |
4603 | * in extreme cases - like having a single transaction create many new | |
4604 | * block groups when starting to write out the free space caches of all | |
4605 | * the block groups that were made dirty during the lifetime of the | |
4606 | * transaction. | |
4607 | */ | |
5ce55557 | 4608 | if (trans->chunk_bytes_reserved >= (u64)SZ_2M) |
6c686b35 | 4609 | btrfs_create_pending_block_groups(trans); |
5ce55557 | 4610 | |
0f9dd46c | 4611 | return ret; |
6324fbf3 | 4612 | } |
9ed74f2d | 4613 | |
c1c4919b | 4614 | static int can_overcommit(struct btrfs_fs_info *fs_info, |
a80c8dcf | 4615 | struct btrfs_space_info *space_info, u64 bytes, |
c1c4919b JM |
4616 | enum btrfs_reserve_flush_enum flush, |
4617 | bool system_chunk) | |
a80c8dcf | 4618 | { |
0b246afa | 4619 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
957780eb | 4620 | u64 profile; |
3c76cd84 | 4621 | u64 space_size; |
a80c8dcf JB |
4622 | u64 avail; |
4623 | u64 used; | |
46df06b8 | 4624 | int factor; |
a80c8dcf | 4625 | |
957780eb JB |
4626 | /* Don't overcommit when in mixed mode. */ |
4627 | if (space_info->flags & BTRFS_BLOCK_GROUP_DATA) | |
4628 | return 0; | |
4629 | ||
c1c4919b JM |
4630 | if (system_chunk) |
4631 | profile = btrfs_system_alloc_profile(fs_info); | |
4632 | else | |
4633 | profile = btrfs_metadata_alloc_profile(fs_info); | |
4634 | ||
4136135b | 4635 | used = btrfs_space_info_used(space_info, false); |
96f1bb57 | 4636 | |
96f1bb57 JB |
4637 | /* |
4638 | * We only want to allow over committing if we have lots of actual space | |
4639 | * free, but if we don't have enough space to handle the global reserve | |
4640 | * space then we could end up having a real enospc problem when trying | |
4641 | * to allocate a chunk or some other such important allocation. | |
4642 | */ | |
3c76cd84 MX |
4643 | spin_lock(&global_rsv->lock); |
4644 | space_size = calc_global_rsv_need_space(global_rsv); | |
4645 | spin_unlock(&global_rsv->lock); | |
4646 | if (used + space_size >= space_info->total_bytes) | |
96f1bb57 JB |
4647 | return 0; |
4648 | ||
4649 | used += space_info->bytes_may_use; | |
a80c8dcf | 4650 | |
a5ed45f8 | 4651 | avail = atomic64_read(&fs_info->free_chunk_space); |
a80c8dcf JB |
4652 | |
4653 | /* | |
4654 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
4655 | * space is actually useable. For raid56, the space info used |
4656 | * doesn't include the parity drive, so we don't have to | |
4657 | * change the math | |
a80c8dcf | 4658 | */ |
46df06b8 DS |
4659 | factor = btrfs_bg_type_to_factor(profile); |
4660 | avail = div_u64(avail, factor); | |
a80c8dcf JB |
4661 | |
4662 | /* | |
561c294d MX |
4663 | * If we aren't flushing all things, let us overcommit up to |
4664 | * 1/2th of the space. If we can flush, don't let us overcommit | |
4665 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 4666 | */ |
08e007d2 | 4667 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
14575aef | 4668 | avail >>= 3; |
a80c8dcf | 4669 | else |
14575aef | 4670 | avail >>= 1; |
a80c8dcf | 4671 | |
14575aef | 4672 | if (used + bytes < space_info->total_bytes + avail) |
a80c8dcf JB |
4673 | return 1; |
4674 | return 0; | |
4675 | } | |
4676 | ||
2ff7e61e | 4677 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info *fs_info, |
6c255e67 | 4678 | unsigned long nr_pages, int nr_items) |
da633a42 | 4679 | { |
0b246afa | 4680 | struct super_block *sb = fs_info->sb; |
da633a42 | 4681 | |
925a6efb JB |
4682 | if (down_read_trylock(&sb->s_umount)) { |
4683 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
4684 | up_read(&sb->s_umount); | |
4685 | } else { | |
da633a42 MX |
4686 | /* |
4687 | * We needn't worry the filesystem going from r/w to r/o though | |
4688 | * we don't acquire ->s_umount mutex, because the filesystem | |
4689 | * should guarantee the delalloc inodes list be empty after | |
4690 | * the filesystem is readonly(all dirty pages are written to | |
4691 | * the disk). | |
4692 | */ | |
82b3e53b | 4693 | btrfs_start_delalloc_roots(fs_info, nr_items); |
98ad69cf | 4694 | if (!current->journal_info) |
0b246afa | 4695 | btrfs_wait_ordered_roots(fs_info, nr_items, 0, (u64)-1); |
da633a42 MX |
4696 | } |
4697 | } | |
4698 | ||
6374e57a | 4699 | static inline u64 calc_reclaim_items_nr(struct btrfs_fs_info *fs_info, |
2ff7e61e | 4700 | u64 to_reclaim) |
18cd8ea6 MX |
4701 | { |
4702 | u64 bytes; | |
6374e57a | 4703 | u64 nr; |
18cd8ea6 | 4704 | |
2ff7e61e | 4705 | bytes = btrfs_calc_trans_metadata_size(fs_info, 1); |
6374e57a | 4706 | nr = div64_u64(to_reclaim, bytes); |
18cd8ea6 MX |
4707 | if (!nr) |
4708 | nr = 1; | |
4709 | return nr; | |
4710 | } | |
4711 | ||
ee22184b | 4712 | #define EXTENT_SIZE_PER_ITEM SZ_256K |
c61a16a7 | 4713 | |
9ed74f2d | 4714 | /* |
5da9d01b | 4715 | * shrink metadata reservation for delalloc |
9ed74f2d | 4716 | */ |
c1c4919b JM |
4717 | static void shrink_delalloc(struct btrfs_fs_info *fs_info, u64 to_reclaim, |
4718 | u64 orig, bool wait_ordered) | |
5da9d01b | 4719 | { |
0019f10d | 4720 | struct btrfs_space_info *space_info; |
663350ac | 4721 | struct btrfs_trans_handle *trans; |
f4c738c2 | 4722 | u64 delalloc_bytes; |
5da9d01b | 4723 | u64 max_reclaim; |
6374e57a | 4724 | u64 items; |
b1953bce | 4725 | long time_left; |
d3ee29e3 MX |
4726 | unsigned long nr_pages; |
4727 | int loops; | |
5da9d01b | 4728 | |
c61a16a7 | 4729 | /* Calc the number of the pages we need flush for space reservation */ |
2ff7e61e | 4730 | items = calc_reclaim_items_nr(fs_info, to_reclaim); |
6374e57a | 4731 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; |
c61a16a7 | 4732 | |
663350ac | 4733 | trans = (struct btrfs_trans_handle *)current->journal_info; |
69fe2d75 | 4734 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
bf9022e0 | 4735 | |
963d678b | 4736 | delalloc_bytes = percpu_counter_sum_positive( |
0b246afa | 4737 | &fs_info->delalloc_bytes); |
f4c738c2 | 4738 | if (delalloc_bytes == 0) { |
fdb5effd | 4739 | if (trans) |
f4c738c2 | 4740 | return; |
38c135af | 4741 | if (wait_ordered) |
0b246afa | 4742 | btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1); |
f4c738c2 | 4743 | return; |
fdb5effd JB |
4744 | } |
4745 | ||
d3ee29e3 | 4746 | loops = 0; |
f4c738c2 JB |
4747 | while (delalloc_bytes && loops < 3) { |
4748 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
09cbfeaf | 4749 | nr_pages = max_reclaim >> PAGE_SHIFT; |
2ff7e61e | 4750 | btrfs_writeback_inodes_sb_nr(fs_info, nr_pages, items); |
dea31f52 JB |
4751 | /* |
4752 | * We need to wait for the async pages to actually start before | |
4753 | * we do anything. | |
4754 | */ | |
0b246afa | 4755 | max_reclaim = atomic_read(&fs_info->async_delalloc_pages); |
9f3a074d MX |
4756 | if (!max_reclaim) |
4757 | goto skip_async; | |
4758 | ||
4759 | if (max_reclaim <= nr_pages) | |
4760 | max_reclaim = 0; | |
4761 | else | |
4762 | max_reclaim -= nr_pages; | |
dea31f52 | 4763 | |
0b246afa JM |
4764 | wait_event(fs_info->async_submit_wait, |
4765 | atomic_read(&fs_info->async_delalloc_pages) <= | |
9f3a074d MX |
4766 | (int)max_reclaim); |
4767 | skip_async: | |
0019f10d | 4768 | spin_lock(&space_info->lock); |
957780eb JB |
4769 | if (list_empty(&space_info->tickets) && |
4770 | list_empty(&space_info->priority_tickets)) { | |
4771 | spin_unlock(&space_info->lock); | |
4772 | break; | |
4773 | } | |
0019f10d | 4774 | spin_unlock(&space_info->lock); |
5da9d01b | 4775 | |
36e39c40 | 4776 | loops++; |
f104d044 | 4777 | if (wait_ordered && !trans) { |
0b246afa | 4778 | btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1); |
f104d044 | 4779 | } else { |
f4c738c2 | 4780 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4781 | if (time_left) |
4782 | break; | |
4783 | } | |
963d678b | 4784 | delalloc_bytes = percpu_counter_sum_positive( |
0b246afa | 4785 | &fs_info->delalloc_bytes); |
5da9d01b | 4786 | } |
5da9d01b YZ |
4787 | } |
4788 | ||
996478ca JB |
4789 | struct reserve_ticket { |
4790 | u64 bytes; | |
4791 | int error; | |
4792 | struct list_head list; | |
4793 | wait_queue_head_t wait; | |
4794 | }; | |
4795 | ||
663350ac JB |
4796 | /** |
4797 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4798 | * @root - the root we're allocating for | |
4799 | * @bytes - the number of bytes we want to reserve | |
4800 | * @force - force the commit | |
8bb8ab2e | 4801 | * |
663350ac JB |
4802 | * This will check to make sure that committing the transaction will actually |
4803 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4804 | * will return -ENOSPC. | |
8bb8ab2e | 4805 | */ |
0c9ab349 | 4806 | static int may_commit_transaction(struct btrfs_fs_info *fs_info, |
996478ca | 4807 | struct btrfs_space_info *space_info) |
663350ac | 4808 | { |
996478ca | 4809 | struct reserve_ticket *ticket = NULL; |
0b246afa | 4810 | struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_block_rsv; |
663350ac | 4811 | struct btrfs_trans_handle *trans; |
996478ca | 4812 | u64 bytes; |
663350ac JB |
4813 | |
4814 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4815 | if (trans) | |
4816 | return -EAGAIN; | |
4817 | ||
996478ca JB |
4818 | spin_lock(&space_info->lock); |
4819 | if (!list_empty(&space_info->priority_tickets)) | |
4820 | ticket = list_first_entry(&space_info->priority_tickets, | |
4821 | struct reserve_ticket, list); | |
4822 | else if (!list_empty(&space_info->tickets)) | |
4823 | ticket = list_first_entry(&space_info->tickets, | |
4824 | struct reserve_ticket, list); | |
4825 | bytes = (ticket) ? ticket->bytes : 0; | |
4826 | spin_unlock(&space_info->lock); | |
4827 | ||
4828 | if (!bytes) | |
4829 | return 0; | |
663350ac JB |
4830 | |
4831 | /* See if there is enough pinned space to make this reservation */ | |
dec59fa3 EL |
4832 | if (__percpu_counter_compare(&space_info->total_bytes_pinned, |
4833 | bytes, | |
4834 | BTRFS_TOTAL_BYTES_PINNED_BATCH) >= 0) | |
663350ac | 4835 | goto commit; |
663350ac JB |
4836 | |
4837 | /* | |
4838 | * See if there is some space in the delayed insertion reservation for | |
4839 | * this reservation. | |
4840 | */ | |
4841 | if (space_info != delayed_rsv->space_info) | |
4842 | return -ENOSPC; | |
4843 | ||
4844 | spin_lock(&delayed_rsv->lock); | |
996478ca JB |
4845 | if (delayed_rsv->size > bytes) |
4846 | bytes = 0; | |
4847 | else | |
4848 | bytes -= delayed_rsv->size; | |
057aac3e NB |
4849 | spin_unlock(&delayed_rsv->lock); |
4850 | ||
dec59fa3 EL |
4851 | if (__percpu_counter_compare(&space_info->total_bytes_pinned, |
4852 | bytes, | |
4853 | BTRFS_TOTAL_BYTES_PINNED_BATCH) < 0) { | |
663350ac JB |
4854 | return -ENOSPC; |
4855 | } | |
663350ac JB |
4856 | |
4857 | commit: | |
a9b3311e | 4858 | trans = btrfs_join_transaction(fs_info->extent_root); |
663350ac JB |
4859 | if (IS_ERR(trans)) |
4860 | return -ENOSPC; | |
4861 | ||
3a45bb20 | 4862 | return btrfs_commit_transaction(trans); |
663350ac JB |
4863 | } |
4864 | ||
e38ae7a0 NB |
4865 | /* |
4866 | * Try to flush some data based on policy set by @state. This is only advisory | |
4867 | * and may fail for various reasons. The caller is supposed to examine the | |
4868 | * state of @space_info to detect the outcome. | |
4869 | */ | |
4870 | static void flush_space(struct btrfs_fs_info *fs_info, | |
96c3f433 | 4871 | struct btrfs_space_info *space_info, u64 num_bytes, |
7bdd6277 | 4872 | int state) |
96c3f433 | 4873 | { |
a9b3311e | 4874 | struct btrfs_root *root = fs_info->extent_root; |
96c3f433 JB |
4875 | struct btrfs_trans_handle *trans; |
4876 | int nr; | |
f4c738c2 | 4877 | int ret = 0; |
96c3f433 JB |
4878 | |
4879 | switch (state) { | |
96c3f433 JB |
4880 | case FLUSH_DELAYED_ITEMS_NR: |
4881 | case FLUSH_DELAYED_ITEMS: | |
18cd8ea6 | 4882 | if (state == FLUSH_DELAYED_ITEMS_NR) |
2ff7e61e | 4883 | nr = calc_reclaim_items_nr(fs_info, num_bytes) * 2; |
18cd8ea6 | 4884 | else |
96c3f433 | 4885 | nr = -1; |
18cd8ea6 | 4886 | |
96c3f433 JB |
4887 | trans = btrfs_join_transaction(root); |
4888 | if (IS_ERR(trans)) { | |
4889 | ret = PTR_ERR(trans); | |
4890 | break; | |
4891 | } | |
e5c304e6 | 4892 | ret = btrfs_run_delayed_items_nr(trans, nr); |
3a45bb20 | 4893 | btrfs_end_transaction(trans); |
96c3f433 | 4894 | break; |
67b0fd63 JB |
4895 | case FLUSH_DELALLOC: |
4896 | case FLUSH_DELALLOC_WAIT: | |
7bdd6277 | 4897 | shrink_delalloc(fs_info, num_bytes * 2, num_bytes, |
67b0fd63 JB |
4898 | state == FLUSH_DELALLOC_WAIT); |
4899 | break; | |
ea658bad JB |
4900 | case ALLOC_CHUNK: |
4901 | trans = btrfs_join_transaction(root); | |
4902 | if (IS_ERR(trans)) { | |
4903 | ret = PTR_ERR(trans); | |
4904 | break; | |
4905 | } | |
01458828 | 4906 | ret = do_chunk_alloc(trans, |
1b86826d | 4907 | btrfs_metadata_alloc_profile(fs_info), |
ea658bad | 4908 | CHUNK_ALLOC_NO_FORCE); |
3a45bb20 | 4909 | btrfs_end_transaction(trans); |
eecba891 | 4910 | if (ret > 0 || ret == -ENOSPC) |
ea658bad JB |
4911 | ret = 0; |
4912 | break; | |
96c3f433 | 4913 | case COMMIT_TRANS: |
996478ca | 4914 | ret = may_commit_transaction(fs_info, space_info); |
96c3f433 JB |
4915 | break; |
4916 | default: | |
4917 | ret = -ENOSPC; | |
4918 | break; | |
4919 | } | |
4920 | ||
7bdd6277 NB |
4921 | trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes, state, |
4922 | ret); | |
e38ae7a0 | 4923 | return; |
96c3f433 | 4924 | } |
21c7e756 MX |
4925 | |
4926 | static inline u64 | |
c1c4919b JM |
4927 | btrfs_calc_reclaim_metadata_size(struct btrfs_fs_info *fs_info, |
4928 | struct btrfs_space_info *space_info, | |
4929 | bool system_chunk) | |
21c7e756 | 4930 | { |
957780eb | 4931 | struct reserve_ticket *ticket; |
21c7e756 MX |
4932 | u64 used; |
4933 | u64 expected; | |
957780eb | 4934 | u64 to_reclaim = 0; |
21c7e756 | 4935 | |
957780eb JB |
4936 | list_for_each_entry(ticket, &space_info->tickets, list) |
4937 | to_reclaim += ticket->bytes; | |
4938 | list_for_each_entry(ticket, &space_info->priority_tickets, list) | |
4939 | to_reclaim += ticket->bytes; | |
4940 | if (to_reclaim) | |
4941 | return to_reclaim; | |
21c7e756 | 4942 | |
e0af2484 | 4943 | to_reclaim = min_t(u64, num_online_cpus() * SZ_1M, SZ_16M); |
c1c4919b JM |
4944 | if (can_overcommit(fs_info, space_info, to_reclaim, |
4945 | BTRFS_RESERVE_FLUSH_ALL, system_chunk)) | |
e0af2484 WX |
4946 | return 0; |
4947 | ||
0eee8a49 NB |
4948 | used = btrfs_space_info_used(space_info, true); |
4949 | ||
c1c4919b JM |
4950 | if (can_overcommit(fs_info, space_info, SZ_1M, |
4951 | BTRFS_RESERVE_FLUSH_ALL, system_chunk)) | |
21c7e756 MX |
4952 | expected = div_factor_fine(space_info->total_bytes, 95); |
4953 | else | |
4954 | expected = div_factor_fine(space_info->total_bytes, 90); | |
4955 | ||
4956 | if (used > expected) | |
4957 | to_reclaim = used - expected; | |
4958 | else | |
4959 | to_reclaim = 0; | |
4960 | to_reclaim = min(to_reclaim, space_info->bytes_may_use + | |
4961 | space_info->bytes_reserved); | |
21c7e756 MX |
4962 | return to_reclaim; |
4963 | } | |
4964 | ||
c1c4919b JM |
4965 | static inline int need_do_async_reclaim(struct btrfs_fs_info *fs_info, |
4966 | struct btrfs_space_info *space_info, | |
4967 | u64 used, bool system_chunk) | |
21c7e756 | 4968 | { |
365c5313 JB |
4969 | u64 thresh = div_factor_fine(space_info->total_bytes, 98); |
4970 | ||
4971 | /* If we're just plain full then async reclaim just slows us down. */ | |
baee8790 | 4972 | if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh) |
365c5313 JB |
4973 | return 0; |
4974 | ||
c1c4919b JM |
4975 | if (!btrfs_calc_reclaim_metadata_size(fs_info, space_info, |
4976 | system_chunk)) | |
d38b349c JB |
4977 | return 0; |
4978 | ||
0b246afa JM |
4979 | return (used >= thresh && !btrfs_fs_closing(fs_info) && |
4980 | !test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state)); | |
21c7e756 MX |
4981 | } |
4982 | ||
957780eb | 4983 | static void wake_all_tickets(struct list_head *head) |
21c7e756 | 4984 | { |
957780eb | 4985 | struct reserve_ticket *ticket; |
25ce459c | 4986 | |
957780eb JB |
4987 | while (!list_empty(head)) { |
4988 | ticket = list_first_entry(head, struct reserve_ticket, list); | |
4989 | list_del_init(&ticket->list); | |
4990 | ticket->error = -ENOSPC; | |
4991 | wake_up(&ticket->wait); | |
21c7e756 | 4992 | } |
21c7e756 MX |
4993 | } |
4994 | ||
957780eb JB |
4995 | /* |
4996 | * This is for normal flushers, we can wait all goddamned day if we want to. We | |
4997 | * will loop and continuously try to flush as long as we are making progress. | |
4998 | * We count progress as clearing off tickets each time we have to loop. | |
4999 | */ | |
21c7e756 MX |
5000 | static void btrfs_async_reclaim_metadata_space(struct work_struct *work) |
5001 | { | |
5002 | struct btrfs_fs_info *fs_info; | |
5003 | struct btrfs_space_info *space_info; | |
5004 | u64 to_reclaim; | |
5005 | int flush_state; | |
957780eb | 5006 | int commit_cycles = 0; |
ce129655 | 5007 | u64 last_tickets_id; |
21c7e756 MX |
5008 | |
5009 | fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work); | |
5010 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
5011 | ||
957780eb | 5012 | spin_lock(&space_info->lock); |
c1c4919b JM |
5013 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info, |
5014 | false); | |
957780eb JB |
5015 | if (!to_reclaim) { |
5016 | space_info->flush = 0; | |
5017 | spin_unlock(&space_info->lock); | |
21c7e756 | 5018 | return; |
957780eb | 5019 | } |
ce129655 | 5020 | last_tickets_id = space_info->tickets_id; |
957780eb | 5021 | spin_unlock(&space_info->lock); |
21c7e756 MX |
5022 | |
5023 | flush_state = FLUSH_DELAYED_ITEMS_NR; | |
957780eb | 5024 | do { |
e38ae7a0 | 5025 | flush_space(fs_info, space_info, to_reclaim, flush_state); |
957780eb JB |
5026 | spin_lock(&space_info->lock); |
5027 | if (list_empty(&space_info->tickets)) { | |
5028 | space_info->flush = 0; | |
5029 | spin_unlock(&space_info->lock); | |
5030 | return; | |
5031 | } | |
c1c4919b JM |
5032 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, |
5033 | space_info, | |
5034 | false); | |
ce129655 | 5035 | if (last_tickets_id == space_info->tickets_id) { |
957780eb JB |
5036 | flush_state++; |
5037 | } else { | |
ce129655 | 5038 | last_tickets_id = space_info->tickets_id; |
957780eb JB |
5039 | flush_state = FLUSH_DELAYED_ITEMS_NR; |
5040 | if (commit_cycles) | |
5041 | commit_cycles--; | |
5042 | } | |
5043 | ||
5044 | if (flush_state > COMMIT_TRANS) { | |
5045 | commit_cycles++; | |
5046 | if (commit_cycles > 2) { | |
5047 | wake_all_tickets(&space_info->tickets); | |
5048 | space_info->flush = 0; | |
5049 | } else { | |
5050 | flush_state = FLUSH_DELAYED_ITEMS_NR; | |
5051 | } | |
5052 | } | |
5053 | spin_unlock(&space_info->lock); | |
5054 | } while (flush_state <= COMMIT_TRANS); | |
5055 | } | |
5056 | ||
5057 | void btrfs_init_async_reclaim_work(struct work_struct *work) | |
5058 | { | |
5059 | INIT_WORK(work, btrfs_async_reclaim_metadata_space); | |
5060 | } | |
5061 | ||
5062 | static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info, | |
5063 | struct btrfs_space_info *space_info, | |
5064 | struct reserve_ticket *ticket) | |
5065 | { | |
5066 | u64 to_reclaim; | |
5067 | int flush_state = FLUSH_DELAYED_ITEMS_NR; | |
5068 | ||
5069 | spin_lock(&space_info->lock); | |
c1c4919b JM |
5070 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info, |
5071 | false); | |
957780eb JB |
5072 | if (!to_reclaim) { |
5073 | spin_unlock(&space_info->lock); | |
5074 | return; | |
5075 | } | |
5076 | spin_unlock(&space_info->lock); | |
5077 | ||
21c7e756 | 5078 | do { |
7bdd6277 | 5079 | flush_space(fs_info, space_info, to_reclaim, flush_state); |
21c7e756 | 5080 | flush_state++; |
957780eb JB |
5081 | spin_lock(&space_info->lock); |
5082 | if (ticket->bytes == 0) { | |
5083 | spin_unlock(&space_info->lock); | |
21c7e756 | 5084 | return; |
957780eb JB |
5085 | } |
5086 | spin_unlock(&space_info->lock); | |
5087 | ||
5088 | /* | |
5089 | * Priority flushers can't wait on delalloc without | |
5090 | * deadlocking. | |
5091 | */ | |
5092 | if (flush_state == FLUSH_DELALLOC || | |
5093 | flush_state == FLUSH_DELALLOC_WAIT) | |
5094 | flush_state = ALLOC_CHUNK; | |
365c5313 | 5095 | } while (flush_state < COMMIT_TRANS); |
21c7e756 MX |
5096 | } |
5097 | ||
957780eb JB |
5098 | static int wait_reserve_ticket(struct btrfs_fs_info *fs_info, |
5099 | struct btrfs_space_info *space_info, | |
5100 | struct reserve_ticket *ticket, u64 orig_bytes) | |
5101 | ||
21c7e756 | 5102 | { |
957780eb JB |
5103 | DEFINE_WAIT(wait); |
5104 | int ret = 0; | |
5105 | ||
5106 | spin_lock(&space_info->lock); | |
5107 | while (ticket->bytes > 0 && ticket->error == 0) { | |
5108 | ret = prepare_to_wait_event(&ticket->wait, &wait, TASK_KILLABLE); | |
5109 | if (ret) { | |
5110 | ret = -EINTR; | |
5111 | break; | |
5112 | } | |
5113 | spin_unlock(&space_info->lock); | |
5114 | ||
5115 | schedule(); | |
5116 | ||
5117 | finish_wait(&ticket->wait, &wait); | |
5118 | spin_lock(&space_info->lock); | |
5119 | } | |
5120 | if (!ret) | |
5121 | ret = ticket->error; | |
5122 | if (!list_empty(&ticket->list)) | |
5123 | list_del_init(&ticket->list); | |
5124 | if (ticket->bytes && ticket->bytes < orig_bytes) { | |
5125 | u64 num_bytes = orig_bytes - ticket->bytes; | |
9f9b8e8d | 5126 | update_bytes_may_use(space_info, -num_bytes); |
957780eb JB |
5127 | trace_btrfs_space_reservation(fs_info, "space_info", |
5128 | space_info->flags, num_bytes, 0); | |
5129 | } | |
5130 | spin_unlock(&space_info->lock); | |
5131 | ||
5132 | return ret; | |
21c7e756 MX |
5133 | } |
5134 | ||
4a92b1b8 JB |
5135 | /** |
5136 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
5137 | * @root - the root we're allocating for | |
957780eb | 5138 | * @space_info - the space info we want to allocate from |
4a92b1b8 | 5139 | * @orig_bytes - the number of bytes we want |
48fc7f7e | 5140 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 5141 | * |
01327610 | 5142 | * This will reserve orig_bytes number of bytes from the space info associated |
4a92b1b8 JB |
5143 | * with the block_rsv. If there is not enough space it will make an attempt to |
5144 | * flush out space to make room. It will do this by flushing delalloc if | |
5145 | * possible or committing the transaction. If flush is 0 then no attempts to | |
5146 | * regain reservations will be made and this will fail if there is not enough | |
5147 | * space already. | |
8bb8ab2e | 5148 | */ |
c1c4919b | 5149 | static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info, |
957780eb JB |
5150 | struct btrfs_space_info *space_info, |
5151 | u64 orig_bytes, | |
c1c4919b JM |
5152 | enum btrfs_reserve_flush_enum flush, |
5153 | bool system_chunk) | |
9ed74f2d | 5154 | { |
957780eb | 5155 | struct reserve_ticket ticket; |
2bf64758 | 5156 | u64 used; |
8bb8ab2e | 5157 | int ret = 0; |
9ed74f2d | 5158 | |
957780eb | 5159 | ASSERT(orig_bytes); |
8ca17f0f | 5160 | ASSERT(!current->journal_info || flush != BTRFS_RESERVE_FLUSH_ALL); |
fdb5effd | 5161 | |
8bb8ab2e | 5162 | spin_lock(&space_info->lock); |
fdb5effd | 5163 | ret = -ENOSPC; |
4136135b | 5164 | used = btrfs_space_info_used(space_info, true); |
9ed74f2d | 5165 | |
8bb8ab2e | 5166 | /* |
957780eb JB |
5167 | * If we have enough space then hooray, make our reservation and carry |
5168 | * on. If not see if we can overcommit, and if we can, hooray carry on. | |
5169 | * If not things get more complicated. | |
8bb8ab2e | 5170 | */ |
957780eb | 5171 | if (used + orig_bytes <= space_info->total_bytes) { |
9f9b8e8d | 5172 | update_bytes_may_use(space_info, orig_bytes); |
0b246afa JM |
5173 | trace_btrfs_space_reservation(fs_info, "space_info", |
5174 | space_info->flags, orig_bytes, 1); | |
957780eb | 5175 | ret = 0; |
c1c4919b JM |
5176 | } else if (can_overcommit(fs_info, space_info, orig_bytes, flush, |
5177 | system_chunk)) { | |
9f9b8e8d | 5178 | update_bytes_may_use(space_info, orig_bytes); |
0b246afa JM |
5179 | trace_btrfs_space_reservation(fs_info, "space_info", |
5180 | space_info->flags, orig_bytes, 1); | |
44734ed1 | 5181 | ret = 0; |
2bf64758 JB |
5182 | } |
5183 | ||
8bb8ab2e | 5184 | /* |
957780eb JB |
5185 | * If we couldn't make a reservation then setup our reservation ticket |
5186 | * and kick the async worker if it's not already running. | |
08e007d2 | 5187 | * |
957780eb JB |
5188 | * If we are a priority flusher then we just need to add our ticket to |
5189 | * the list and we will do our own flushing further down. | |
8bb8ab2e | 5190 | */ |
72bcd99d | 5191 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
957780eb JB |
5192 | ticket.bytes = orig_bytes; |
5193 | ticket.error = 0; | |
5194 | init_waitqueue_head(&ticket.wait); | |
5195 | if (flush == BTRFS_RESERVE_FLUSH_ALL) { | |
5196 | list_add_tail(&ticket.list, &space_info->tickets); | |
5197 | if (!space_info->flush) { | |
5198 | space_info->flush = 1; | |
0b246afa | 5199 | trace_btrfs_trigger_flush(fs_info, |
f376df2b JB |
5200 | space_info->flags, |
5201 | orig_bytes, flush, | |
5202 | "enospc"); | |
957780eb | 5203 | queue_work(system_unbound_wq, |
c1c4919b | 5204 | &fs_info->async_reclaim_work); |
957780eb JB |
5205 | } |
5206 | } else { | |
5207 | list_add_tail(&ticket.list, | |
5208 | &space_info->priority_tickets); | |
5209 | } | |
21c7e756 MX |
5210 | } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { |
5211 | used += orig_bytes; | |
f6acfd50 JB |
5212 | /* |
5213 | * We will do the space reservation dance during log replay, | |
5214 | * which means we won't have fs_info->fs_root set, so don't do | |
5215 | * the async reclaim as we will panic. | |
5216 | */ | |
0b246afa | 5217 | if (!test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags) && |
c1c4919b JM |
5218 | need_do_async_reclaim(fs_info, space_info, |
5219 | used, system_chunk) && | |
0b246afa JM |
5220 | !work_busy(&fs_info->async_reclaim_work)) { |
5221 | trace_btrfs_trigger_flush(fs_info, space_info->flags, | |
5222 | orig_bytes, flush, "preempt"); | |
21c7e756 | 5223 | queue_work(system_unbound_wq, |
0b246afa | 5224 | &fs_info->async_reclaim_work); |
f376df2b | 5225 | } |
8bb8ab2e | 5226 | } |
f0486c68 | 5227 | spin_unlock(&space_info->lock); |
08e007d2 | 5228 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
957780eb | 5229 | return ret; |
f0486c68 | 5230 | |
957780eb | 5231 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
0b246afa | 5232 | return wait_reserve_ticket(fs_info, space_info, &ticket, |
957780eb | 5233 | orig_bytes); |
08e007d2 | 5234 | |
957780eb | 5235 | ret = 0; |
0b246afa | 5236 | priority_reclaim_metadata_space(fs_info, space_info, &ticket); |
957780eb JB |
5237 | spin_lock(&space_info->lock); |
5238 | if (ticket.bytes) { | |
5239 | if (ticket.bytes < orig_bytes) { | |
5240 | u64 num_bytes = orig_bytes - ticket.bytes; | |
9f9b8e8d | 5241 | update_bytes_may_use(space_info, -num_bytes); |
0b246afa JM |
5242 | trace_btrfs_space_reservation(fs_info, "space_info", |
5243 | space_info->flags, | |
5244 | num_bytes, 0); | |
08e007d2 | 5245 | |
957780eb JB |
5246 | } |
5247 | list_del_init(&ticket.list); | |
5248 | ret = -ENOSPC; | |
5249 | } | |
5250 | spin_unlock(&space_info->lock); | |
5251 | ASSERT(list_empty(&ticket.list)); | |
5252 | return ret; | |
5253 | } | |
8bb8ab2e | 5254 | |
957780eb JB |
5255 | /** |
5256 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
5257 | * @root - the root we're allocating for | |
5258 | * @block_rsv - the block_rsv we're allocating for | |
5259 | * @orig_bytes - the number of bytes we want | |
5260 | * @flush - whether or not we can flush to make our reservation | |
5261 | * | |
5262 | * This will reserve orgi_bytes number of bytes from the space info associated | |
5263 | * with the block_rsv. If there is not enough space it will make an attempt to | |
5264 | * flush out space to make room. It will do this by flushing delalloc if | |
5265 | * possible or committing the transaction. If flush is 0 then no attempts to | |
5266 | * regain reservations will be made and this will fail if there is not enough | |
5267 | * space already. | |
5268 | */ | |
5269 | static int reserve_metadata_bytes(struct btrfs_root *root, | |
5270 | struct btrfs_block_rsv *block_rsv, | |
5271 | u64 orig_bytes, | |
5272 | enum btrfs_reserve_flush_enum flush) | |
5273 | { | |
0b246afa JM |
5274 | struct btrfs_fs_info *fs_info = root->fs_info; |
5275 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
957780eb | 5276 | int ret; |
c1c4919b | 5277 | bool system_chunk = (root == fs_info->chunk_root); |
957780eb | 5278 | |
c1c4919b JM |
5279 | ret = __reserve_metadata_bytes(fs_info, block_rsv->space_info, |
5280 | orig_bytes, flush, system_chunk); | |
5d80366e JB |
5281 | if (ret == -ENOSPC && |
5282 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
5d80366e JB |
5283 | if (block_rsv != global_rsv && |
5284 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
5285 | ret = 0; | |
5286 | } | |
9a3daff3 | 5287 | if (ret == -ENOSPC) { |
0b246afa | 5288 | trace_btrfs_space_reservation(fs_info, "space_info:enospc", |
957780eb JB |
5289 | block_rsv->space_info->flags, |
5290 | orig_bytes, 1); | |
9a3daff3 NB |
5291 | |
5292 | if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) | |
5293 | dump_space_info(fs_info, block_rsv->space_info, | |
5294 | orig_bytes, 0); | |
5295 | } | |
f0486c68 YZ |
5296 | return ret; |
5297 | } | |
5298 | ||
79787eaa JM |
5299 | static struct btrfs_block_rsv *get_block_rsv( |
5300 | const struct btrfs_trans_handle *trans, | |
5301 | const struct btrfs_root *root) | |
f0486c68 | 5302 | { |
0b246afa | 5303 | struct btrfs_fs_info *fs_info = root->fs_info; |
4c13d758 JB |
5304 | struct btrfs_block_rsv *block_rsv = NULL; |
5305 | ||
e9cf439f | 5306 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
0b246afa JM |
5307 | (root == fs_info->csum_root && trans->adding_csums) || |
5308 | (root == fs_info->uuid_root)) | |
f7a81ea4 SB |
5309 | block_rsv = trans->block_rsv; |
5310 | ||
4c13d758 | 5311 | if (!block_rsv) |
f0486c68 YZ |
5312 | block_rsv = root->block_rsv; |
5313 | ||
5314 | if (!block_rsv) | |
0b246afa | 5315 | block_rsv = &fs_info->empty_block_rsv; |
f0486c68 YZ |
5316 | |
5317 | return block_rsv; | |
5318 | } | |
5319 | ||
5320 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
5321 | u64 num_bytes) | |
5322 | { | |
5323 | int ret = -ENOSPC; | |
5324 | spin_lock(&block_rsv->lock); | |
5325 | if (block_rsv->reserved >= num_bytes) { | |
5326 | block_rsv->reserved -= num_bytes; | |
5327 | if (block_rsv->reserved < block_rsv->size) | |
5328 | block_rsv->full = 0; | |
5329 | ret = 0; | |
5330 | } | |
5331 | spin_unlock(&block_rsv->lock); | |
5332 | return ret; | |
5333 | } | |
5334 | ||
5335 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
3a584174 | 5336 | u64 num_bytes, bool update_size) |
f0486c68 YZ |
5337 | { |
5338 | spin_lock(&block_rsv->lock); | |
5339 | block_rsv->reserved += num_bytes; | |
5340 | if (update_size) | |
5341 | block_rsv->size += num_bytes; | |
5342 | else if (block_rsv->reserved >= block_rsv->size) | |
5343 | block_rsv->full = 1; | |
5344 | spin_unlock(&block_rsv->lock); | |
5345 | } | |
5346 | ||
d52be818 JB |
5347 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
5348 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
5349 | int min_factor) | |
5350 | { | |
5351 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
5352 | u64 min_bytes; | |
5353 | ||
5354 | if (global_rsv->space_info != dest->space_info) | |
5355 | return -ENOSPC; | |
5356 | ||
5357 | spin_lock(&global_rsv->lock); | |
5358 | min_bytes = div_factor(global_rsv->size, min_factor); | |
5359 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
5360 | spin_unlock(&global_rsv->lock); | |
5361 | return -ENOSPC; | |
5362 | } | |
5363 | global_rsv->reserved -= num_bytes; | |
5364 | if (global_rsv->reserved < global_rsv->size) | |
5365 | global_rsv->full = 0; | |
5366 | spin_unlock(&global_rsv->lock); | |
5367 | ||
3a584174 | 5368 | block_rsv_add_bytes(dest, num_bytes, true); |
d52be818 JB |
5369 | return 0; |
5370 | } | |
5371 | ||
957780eb JB |
5372 | /* |
5373 | * This is for space we already have accounted in space_info->bytes_may_use, so | |
5374 | * basically when we're returning space from block_rsv's. | |
5375 | */ | |
5376 | static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info, | |
5377 | struct btrfs_space_info *space_info, | |
5378 | u64 num_bytes) | |
5379 | { | |
5380 | struct reserve_ticket *ticket; | |
5381 | struct list_head *head; | |
5382 | u64 used; | |
5383 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_NO_FLUSH; | |
5384 | bool check_overcommit = false; | |
5385 | ||
5386 | spin_lock(&space_info->lock); | |
5387 | head = &space_info->priority_tickets; | |
5388 | ||
5389 | /* | |
5390 | * If we are over our limit then we need to check and see if we can | |
5391 | * overcommit, and if we can't then we just need to free up our space | |
5392 | * and not satisfy any requests. | |
5393 | */ | |
0eee8a49 | 5394 | used = btrfs_space_info_used(space_info, true); |
957780eb JB |
5395 | if (used - num_bytes >= space_info->total_bytes) |
5396 | check_overcommit = true; | |
5397 | again: | |
5398 | while (!list_empty(head) && num_bytes) { | |
5399 | ticket = list_first_entry(head, struct reserve_ticket, | |
5400 | list); | |
5401 | /* | |
5402 | * We use 0 bytes because this space is already reserved, so | |
5403 | * adding the ticket space would be a double count. | |
5404 | */ | |
5405 | if (check_overcommit && | |
c1c4919b | 5406 | !can_overcommit(fs_info, space_info, 0, flush, false)) |
957780eb JB |
5407 | break; |
5408 | if (num_bytes >= ticket->bytes) { | |
5409 | list_del_init(&ticket->list); | |
5410 | num_bytes -= ticket->bytes; | |
5411 | ticket->bytes = 0; | |
ce129655 | 5412 | space_info->tickets_id++; |
957780eb JB |
5413 | wake_up(&ticket->wait); |
5414 | } else { | |
5415 | ticket->bytes -= num_bytes; | |
5416 | num_bytes = 0; | |
5417 | } | |
5418 | } | |
5419 | ||
5420 | if (num_bytes && head == &space_info->priority_tickets) { | |
5421 | head = &space_info->tickets; | |
5422 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
5423 | goto again; | |
5424 | } | |
9f9b8e8d | 5425 | update_bytes_may_use(space_info, -num_bytes); |
957780eb JB |
5426 | trace_btrfs_space_reservation(fs_info, "space_info", |
5427 | space_info->flags, num_bytes, 0); | |
5428 | spin_unlock(&space_info->lock); | |
5429 | } | |
5430 | ||
5431 | /* | |
5432 | * This is for newly allocated space that isn't accounted in | |
5433 | * space_info->bytes_may_use yet. So if we allocate a chunk or unpin an extent | |
5434 | * we use this helper. | |
5435 | */ | |
5436 | static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info, | |
5437 | struct btrfs_space_info *space_info, | |
5438 | u64 num_bytes) | |
5439 | { | |
5440 | struct reserve_ticket *ticket; | |
5441 | struct list_head *head = &space_info->priority_tickets; | |
5442 | ||
5443 | again: | |
5444 | while (!list_empty(head) && num_bytes) { | |
5445 | ticket = list_first_entry(head, struct reserve_ticket, | |
5446 | list); | |
5447 | if (num_bytes >= ticket->bytes) { | |
5448 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5449 | space_info->flags, | |
5450 | ticket->bytes, 1); | |
5451 | list_del_init(&ticket->list); | |
5452 | num_bytes -= ticket->bytes; | |
9f9b8e8d | 5453 | update_bytes_may_use(space_info, ticket->bytes); |
957780eb | 5454 | ticket->bytes = 0; |
ce129655 | 5455 | space_info->tickets_id++; |
957780eb JB |
5456 | wake_up(&ticket->wait); |
5457 | } else { | |
5458 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5459 | space_info->flags, | |
5460 | num_bytes, 1); | |
9f9b8e8d | 5461 | update_bytes_may_use(space_info, num_bytes); |
957780eb JB |
5462 | ticket->bytes -= num_bytes; |
5463 | num_bytes = 0; | |
5464 | } | |
5465 | } | |
5466 | ||
5467 | if (num_bytes && head == &space_info->priority_tickets) { | |
5468 | head = &space_info->tickets; | |
5469 | goto again; | |
5470 | } | |
5471 | } | |
5472 | ||
69fe2d75 | 5473 | static u64 block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
8c2a3ca2 | 5474 | struct btrfs_block_rsv *block_rsv, |
ff6bc37e QW |
5475 | struct btrfs_block_rsv *dest, u64 num_bytes, |
5476 | u64 *qgroup_to_release_ret) | |
f0486c68 YZ |
5477 | { |
5478 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
ff6bc37e | 5479 | u64 qgroup_to_release = 0; |
69fe2d75 | 5480 | u64 ret; |
f0486c68 YZ |
5481 | |
5482 | spin_lock(&block_rsv->lock); | |
ff6bc37e | 5483 | if (num_bytes == (u64)-1) { |
f0486c68 | 5484 | num_bytes = block_rsv->size; |
ff6bc37e QW |
5485 | qgroup_to_release = block_rsv->qgroup_rsv_size; |
5486 | } | |
f0486c68 YZ |
5487 | block_rsv->size -= num_bytes; |
5488 | if (block_rsv->reserved >= block_rsv->size) { | |
5489 | num_bytes = block_rsv->reserved - block_rsv->size; | |
5490 | block_rsv->reserved = block_rsv->size; | |
5491 | block_rsv->full = 1; | |
5492 | } else { | |
5493 | num_bytes = 0; | |
5494 | } | |
ff6bc37e QW |
5495 | if (block_rsv->qgroup_rsv_reserved >= block_rsv->qgroup_rsv_size) { |
5496 | qgroup_to_release = block_rsv->qgroup_rsv_reserved - | |
5497 | block_rsv->qgroup_rsv_size; | |
5498 | block_rsv->qgroup_rsv_reserved = block_rsv->qgroup_rsv_size; | |
5499 | } else { | |
5500 | qgroup_to_release = 0; | |
5501 | } | |
f0486c68 YZ |
5502 | spin_unlock(&block_rsv->lock); |
5503 | ||
69fe2d75 | 5504 | ret = num_bytes; |
f0486c68 YZ |
5505 | if (num_bytes > 0) { |
5506 | if (dest) { | |
e9e22899 JB |
5507 | spin_lock(&dest->lock); |
5508 | if (!dest->full) { | |
5509 | u64 bytes_to_add; | |
5510 | ||
5511 | bytes_to_add = dest->size - dest->reserved; | |
5512 | bytes_to_add = min(num_bytes, bytes_to_add); | |
5513 | dest->reserved += bytes_to_add; | |
5514 | if (dest->reserved >= dest->size) | |
5515 | dest->full = 1; | |
5516 | num_bytes -= bytes_to_add; | |
5517 | } | |
5518 | spin_unlock(&dest->lock); | |
5519 | } | |
957780eb JB |
5520 | if (num_bytes) |
5521 | space_info_add_old_bytes(fs_info, space_info, | |
5522 | num_bytes); | |
9ed74f2d | 5523 | } |
ff6bc37e QW |
5524 | if (qgroup_to_release_ret) |
5525 | *qgroup_to_release_ret = qgroup_to_release; | |
69fe2d75 | 5526 | return ret; |
f0486c68 | 5527 | } |
4e06bdd6 | 5528 | |
25d609f8 JB |
5529 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src, |
5530 | struct btrfs_block_rsv *dst, u64 num_bytes, | |
3a584174 | 5531 | bool update_size) |
f0486c68 YZ |
5532 | { |
5533 | int ret; | |
9ed74f2d | 5534 | |
f0486c68 YZ |
5535 | ret = block_rsv_use_bytes(src, num_bytes); |
5536 | if (ret) | |
5537 | return ret; | |
9ed74f2d | 5538 | |
25d609f8 | 5539 | block_rsv_add_bytes(dst, num_bytes, update_size); |
9ed74f2d JB |
5540 | return 0; |
5541 | } | |
5542 | ||
66d8f3dd | 5543 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 5544 | { |
f0486c68 YZ |
5545 | memset(rsv, 0, sizeof(*rsv)); |
5546 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 5547 | rsv->type = type; |
f0486c68 YZ |
5548 | } |
5549 | ||
69fe2d75 JB |
5550 | void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info, |
5551 | struct btrfs_block_rsv *rsv, | |
5552 | unsigned short type) | |
5553 | { | |
5554 | btrfs_init_block_rsv(rsv, type); | |
5555 | rsv->space_info = __find_space_info(fs_info, | |
5556 | BTRFS_BLOCK_GROUP_METADATA); | |
5557 | } | |
5558 | ||
2ff7e61e | 5559 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info, |
66d8f3dd | 5560 | unsigned short type) |
f0486c68 YZ |
5561 | { |
5562 | struct btrfs_block_rsv *block_rsv; | |
9ed74f2d | 5563 | |
f0486c68 YZ |
5564 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
5565 | if (!block_rsv) | |
5566 | return NULL; | |
9ed74f2d | 5567 | |
69fe2d75 | 5568 | btrfs_init_metadata_block_rsv(fs_info, block_rsv, type); |
f0486c68 YZ |
5569 | return block_rsv; |
5570 | } | |
9ed74f2d | 5571 | |
2ff7e61e | 5572 | void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
5573 | struct btrfs_block_rsv *rsv) |
5574 | { | |
2aaa6655 JB |
5575 | if (!rsv) |
5576 | return; | |
2ff7e61e | 5577 | btrfs_block_rsv_release(fs_info, rsv, (u64)-1); |
dabdb640 | 5578 | kfree(rsv); |
9ed74f2d JB |
5579 | } |
5580 | ||
08e007d2 MX |
5581 | int btrfs_block_rsv_add(struct btrfs_root *root, |
5582 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
5583 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 5584 | { |
f0486c68 | 5585 | int ret; |
9ed74f2d | 5586 | |
f0486c68 YZ |
5587 | if (num_bytes == 0) |
5588 | return 0; | |
8bb8ab2e | 5589 | |
61b520a9 | 5590 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
5a2cb25a | 5591 | if (!ret) |
3a584174 | 5592 | block_rsv_add_bytes(block_rsv, num_bytes, true); |
9ed74f2d | 5593 | |
f0486c68 | 5594 | return ret; |
f0486c68 | 5595 | } |
9ed74f2d | 5596 | |
2ff7e61e | 5597 | int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
5598 | { |
5599 | u64 num_bytes = 0; | |
f0486c68 | 5600 | int ret = -ENOSPC; |
9ed74f2d | 5601 | |
f0486c68 YZ |
5602 | if (!block_rsv) |
5603 | return 0; | |
9ed74f2d | 5604 | |
f0486c68 | 5605 | spin_lock(&block_rsv->lock); |
36ba022a JB |
5606 | num_bytes = div_factor(block_rsv->size, min_factor); |
5607 | if (block_rsv->reserved >= num_bytes) | |
5608 | ret = 0; | |
5609 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 5610 | |
36ba022a JB |
5611 | return ret; |
5612 | } | |
5613 | ||
08e007d2 MX |
5614 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
5615 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
5616 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
5617 | { |
5618 | u64 num_bytes = 0; | |
5619 | int ret = -ENOSPC; | |
5620 | ||
5621 | if (!block_rsv) | |
5622 | return 0; | |
5623 | ||
5624 | spin_lock(&block_rsv->lock); | |
5625 | num_bytes = min_reserved; | |
13553e52 | 5626 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 5627 | ret = 0; |
13553e52 | 5628 | else |
f0486c68 | 5629 | num_bytes -= block_rsv->reserved; |
f0486c68 | 5630 | spin_unlock(&block_rsv->lock); |
13553e52 | 5631 | |
f0486c68 YZ |
5632 | if (!ret) |
5633 | return 0; | |
5634 | ||
aa38a711 | 5635 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 | 5636 | if (!ret) { |
3a584174 | 5637 | block_rsv_add_bytes(block_rsv, num_bytes, false); |
f0486c68 | 5638 | return 0; |
6a63209f | 5639 | } |
9ed74f2d | 5640 | |
13553e52 | 5641 | return ret; |
f0486c68 YZ |
5642 | } |
5643 | ||
69fe2d75 JB |
5644 | /** |
5645 | * btrfs_inode_rsv_refill - refill the inode block rsv. | |
5646 | * @inode - the inode we are refilling. | |
5647 | * @flush - the flusing restriction. | |
5648 | * | |
5649 | * Essentially the same as btrfs_block_rsv_refill, except it uses the | |
5650 | * block_rsv->size as the minimum size. We'll either refill the missing amount | |
5651 | * or return if we already have enough space. This will also handle the resreve | |
5652 | * tracepoint for the reserved amount. | |
5653 | */ | |
3f2dd7a0 QW |
5654 | static int btrfs_inode_rsv_refill(struct btrfs_inode *inode, |
5655 | enum btrfs_reserve_flush_enum flush) | |
69fe2d75 JB |
5656 | { |
5657 | struct btrfs_root *root = inode->root; | |
5658 | struct btrfs_block_rsv *block_rsv = &inode->block_rsv; | |
5659 | u64 num_bytes = 0; | |
ff6bc37e | 5660 | u64 qgroup_num_bytes = 0; |
69fe2d75 JB |
5661 | int ret = -ENOSPC; |
5662 | ||
5663 | spin_lock(&block_rsv->lock); | |
5664 | if (block_rsv->reserved < block_rsv->size) | |
5665 | num_bytes = block_rsv->size - block_rsv->reserved; | |
ff6bc37e QW |
5666 | if (block_rsv->qgroup_rsv_reserved < block_rsv->qgroup_rsv_size) |
5667 | qgroup_num_bytes = block_rsv->qgroup_rsv_size - | |
5668 | block_rsv->qgroup_rsv_reserved; | |
69fe2d75 JB |
5669 | spin_unlock(&block_rsv->lock); |
5670 | ||
5671 | if (num_bytes == 0) | |
5672 | return 0; | |
5673 | ||
ff6bc37e | 5674 | ret = btrfs_qgroup_reserve_meta_prealloc(root, qgroup_num_bytes, true); |
43b18595 QW |
5675 | if (ret) |
5676 | return ret; | |
69fe2d75 JB |
5677 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
5678 | if (!ret) { | |
3a584174 | 5679 | block_rsv_add_bytes(block_rsv, num_bytes, false); |
69fe2d75 JB |
5680 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
5681 | btrfs_ino(inode), num_bytes, 1); | |
ff6bc37e QW |
5682 | |
5683 | /* Don't forget to increase qgroup_rsv_reserved */ | |
5684 | spin_lock(&block_rsv->lock); | |
5685 | block_rsv->qgroup_rsv_reserved += qgroup_num_bytes; | |
5686 | spin_unlock(&block_rsv->lock); | |
5687 | } else | |
5688 | btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes); | |
69fe2d75 JB |
5689 | return ret; |
5690 | } | |
5691 | ||
5692 | /** | |
5693 | * btrfs_inode_rsv_release - release any excessive reservation. | |
5694 | * @inode - the inode we need to release from. | |
43b18595 QW |
5695 | * @qgroup_free - free or convert qgroup meta. |
5696 | * Unlike normal operation, qgroup meta reservation needs to know if we are | |
5697 | * freeing qgroup reservation or just converting it into per-trans. Normally | |
5698 | * @qgroup_free is true for error handling, and false for normal release. | |
69fe2d75 JB |
5699 | * |
5700 | * This is the same as btrfs_block_rsv_release, except that it handles the | |
5701 | * tracepoint for the reservation. | |
5702 | */ | |
43b18595 | 5703 | static void btrfs_inode_rsv_release(struct btrfs_inode *inode, bool qgroup_free) |
69fe2d75 JB |
5704 | { |
5705 | struct btrfs_fs_info *fs_info = inode->root->fs_info; | |
5706 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
5707 | struct btrfs_block_rsv *block_rsv = &inode->block_rsv; | |
5708 | u64 released = 0; | |
ff6bc37e | 5709 | u64 qgroup_to_release = 0; |
69fe2d75 JB |
5710 | |
5711 | /* | |
5712 | * Since we statically set the block_rsv->size we just want to say we | |
5713 | * are releasing 0 bytes, and then we'll just get the reservation over | |
5714 | * the size free'd. | |
5715 | */ | |
ff6bc37e QW |
5716 | released = block_rsv_release_bytes(fs_info, block_rsv, global_rsv, 0, |
5717 | &qgroup_to_release); | |
69fe2d75 JB |
5718 | if (released > 0) |
5719 | trace_btrfs_space_reservation(fs_info, "delalloc", | |
5720 | btrfs_ino(inode), released, 0); | |
43b18595 | 5721 | if (qgroup_free) |
ff6bc37e | 5722 | btrfs_qgroup_free_meta_prealloc(inode->root, qgroup_to_release); |
43b18595 | 5723 | else |
ff6bc37e QW |
5724 | btrfs_qgroup_convert_reserved_meta(inode->root, |
5725 | qgroup_to_release); | |
69fe2d75 JB |
5726 | } |
5727 | ||
2ff7e61e | 5728 | void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
5729 | struct btrfs_block_rsv *block_rsv, |
5730 | u64 num_bytes) | |
5731 | { | |
0b246afa JM |
5732 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
5733 | ||
17504584 | 5734 | if (global_rsv == block_rsv || |
f0486c68 YZ |
5735 | block_rsv->space_info != global_rsv->space_info) |
5736 | global_rsv = NULL; | |
ff6bc37e | 5737 | block_rsv_release_bytes(fs_info, block_rsv, global_rsv, num_bytes, NULL); |
6a63209f JB |
5738 | } |
5739 | ||
8929ecfa YZ |
5740 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
5741 | { | |
5742 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
5743 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
5744 | u64 num_bytes; | |
6a63209f | 5745 | |
ae2e4728 JB |
5746 | /* |
5747 | * The global block rsv is based on the size of the extent tree, the | |
5748 | * checksum tree and the root tree. If the fs is empty we want to set | |
5749 | * it to a minimal amount for safety. | |
5750 | */ | |
5751 | num_bytes = btrfs_root_used(&fs_info->extent_root->root_item) + | |
5752 | btrfs_root_used(&fs_info->csum_root->root_item) + | |
5753 | btrfs_root_used(&fs_info->tree_root->root_item); | |
5754 | num_bytes = max_t(u64, num_bytes, SZ_16M); | |
33b4d47f | 5755 | |
8929ecfa | 5756 | spin_lock(&sinfo->lock); |
1f699d38 | 5757 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 5758 | |
ee22184b | 5759 | block_rsv->size = min_t(u64, num_bytes, SZ_512M); |
4e06bdd6 | 5760 | |
fb4b10e5 | 5761 | if (block_rsv->reserved < block_rsv->size) { |
4136135b | 5762 | num_bytes = btrfs_space_info_used(sinfo, true); |
fb4b10e5 JB |
5763 | if (sinfo->total_bytes > num_bytes) { |
5764 | num_bytes = sinfo->total_bytes - num_bytes; | |
5765 | num_bytes = min(num_bytes, | |
5766 | block_rsv->size - block_rsv->reserved); | |
5767 | block_rsv->reserved += num_bytes; | |
9f9b8e8d | 5768 | update_bytes_may_use(sinfo, num_bytes); |
fb4b10e5 JB |
5769 | trace_btrfs_space_reservation(fs_info, "space_info", |
5770 | sinfo->flags, num_bytes, | |
5771 | 1); | |
5772 | } | |
5773 | } else if (block_rsv->reserved > block_rsv->size) { | |
8929ecfa | 5774 | num_bytes = block_rsv->reserved - block_rsv->size; |
9f9b8e8d | 5775 | update_bytes_may_use(sinfo, -num_bytes); |
8c2a3ca2 | 5776 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 5777 | sinfo->flags, num_bytes, 0); |
8929ecfa | 5778 | block_rsv->reserved = block_rsv->size; |
8929ecfa | 5779 | } |
182608c8 | 5780 | |
fb4b10e5 JB |
5781 | if (block_rsv->reserved == block_rsv->size) |
5782 | block_rsv->full = 1; | |
5783 | else | |
5784 | block_rsv->full = 0; | |
5785 | ||
8929ecfa | 5786 | spin_unlock(&block_rsv->lock); |
1f699d38 | 5787 | spin_unlock(&sinfo->lock); |
6a63209f JB |
5788 | } |
5789 | ||
f0486c68 | 5790 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 5791 | { |
f0486c68 | 5792 | struct btrfs_space_info *space_info; |
6a63209f | 5793 | |
f0486c68 YZ |
5794 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
5795 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 5796 | |
f0486c68 | 5797 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 5798 | fs_info->global_block_rsv.space_info = space_info; |
f0486c68 YZ |
5799 | fs_info->trans_block_rsv.space_info = space_info; |
5800 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 5801 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 5802 | |
8929ecfa YZ |
5803 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
5804 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
5805 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
5806 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
3a6cad90 SB |
5807 | if (fs_info->quota_root) |
5808 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 5809 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 5810 | |
8929ecfa | 5811 | update_global_block_rsv(fs_info); |
6a63209f JB |
5812 | } |
5813 | ||
8929ecfa | 5814 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 5815 | { |
8c2a3ca2 | 5816 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
ff6bc37e | 5817 | (u64)-1, NULL); |
8929ecfa YZ |
5818 | WARN_ON(fs_info->trans_block_rsv.size > 0); |
5819 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
5820 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
5821 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
5822 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
5823 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
5824 | } |
5825 | ||
6a63209f | 5826 | |
4fbcdf66 FM |
5827 | /* |
5828 | * To be called after all the new block groups attached to the transaction | |
5829 | * handle have been created (btrfs_create_pending_block_groups()). | |
5830 | */ | |
5831 | void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans) | |
5832 | { | |
64b63580 | 5833 | struct btrfs_fs_info *fs_info = trans->fs_info; |
4fbcdf66 FM |
5834 | |
5835 | if (!trans->chunk_bytes_reserved) | |
5836 | return; | |
5837 | ||
5838 | WARN_ON_ONCE(!list_empty(&trans->new_bgs)); | |
5839 | ||
5840 | block_rsv_release_bytes(fs_info, &fs_info->chunk_block_rsv, NULL, | |
ff6bc37e | 5841 | trans->chunk_bytes_reserved, NULL); |
4fbcdf66 FM |
5842 | trans->chunk_bytes_reserved = 0; |
5843 | } | |
5844 | ||
d5c12070 MX |
5845 | /* |
5846 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
5847 | * root: the root of the parent directory | |
5848 | * rsv: block reservation | |
5849 | * items: the number of items that we need do reservation | |
a5b7f429 | 5850 | * use_global_rsv: allow fallback to the global block reservation |
d5c12070 MX |
5851 | * |
5852 | * This function is used to reserve the space for snapshot/subvolume | |
5853 | * creation and deletion. Those operations are different with the | |
5854 | * common file/directory operations, they change two fs/file trees | |
5855 | * and root tree, the number of items that the qgroup reserves is | |
5856 | * different with the free space reservation. So we can not use | |
01327610 | 5857 | * the space reservation mechanism in start_transaction(). |
d5c12070 MX |
5858 | */ |
5859 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
a5b7f429 | 5860 | struct btrfs_block_rsv *rsv, int items, |
ee3441b4 | 5861 | bool use_global_rsv) |
a22285a6 | 5862 | { |
a5b7f429 | 5863 | u64 qgroup_num_bytes = 0; |
d5c12070 MX |
5864 | u64 num_bytes; |
5865 | int ret; | |
0b246afa JM |
5866 | struct btrfs_fs_info *fs_info = root->fs_info; |
5867 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
d5c12070 | 5868 | |
0b246afa | 5869 | if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) { |
d5c12070 | 5870 | /* One for parent inode, two for dir entries */ |
a5b7f429 LF |
5871 | qgroup_num_bytes = 3 * fs_info->nodesize; |
5872 | ret = btrfs_qgroup_reserve_meta_prealloc(root, | |
5873 | qgroup_num_bytes, true); | |
d5c12070 MX |
5874 | if (ret) |
5875 | return ret; | |
d5c12070 MX |
5876 | } |
5877 | ||
0b246afa JM |
5878 | num_bytes = btrfs_calc_trans_metadata_size(fs_info, items); |
5879 | rsv->space_info = __find_space_info(fs_info, | |
d5c12070 MX |
5880 | BTRFS_BLOCK_GROUP_METADATA); |
5881 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
5882 | BTRFS_RESERVE_FLUSH_ALL); | |
ee3441b4 JM |
5883 | |
5884 | if (ret == -ENOSPC && use_global_rsv) | |
3a584174 | 5885 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes, true); |
ee3441b4 | 5886 | |
a5b7f429 LF |
5887 | if (ret && qgroup_num_bytes) |
5888 | btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes); | |
d5c12070 MX |
5889 | |
5890 | return ret; | |
5891 | } | |
5892 | ||
2ff7e61e | 5893 | void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info, |
7775c818 | 5894 | struct btrfs_block_rsv *rsv) |
d5c12070 | 5895 | { |
2ff7e61e | 5896 | btrfs_block_rsv_release(fs_info, rsv, (u64)-1); |
97e728d4 JB |
5897 | } |
5898 | ||
69fe2d75 JB |
5899 | static void btrfs_calculate_inode_block_rsv_size(struct btrfs_fs_info *fs_info, |
5900 | struct btrfs_inode *inode) | |
9e0baf60 | 5901 | { |
69fe2d75 JB |
5902 | struct btrfs_block_rsv *block_rsv = &inode->block_rsv; |
5903 | u64 reserve_size = 0; | |
ff6bc37e | 5904 | u64 qgroup_rsv_size = 0; |
69fe2d75 JB |
5905 | u64 csum_leaves; |
5906 | unsigned outstanding_extents; | |
9e0baf60 | 5907 | |
69fe2d75 JB |
5908 | lockdep_assert_held(&inode->lock); |
5909 | outstanding_extents = inode->outstanding_extents; | |
5910 | if (outstanding_extents) | |
5911 | reserve_size = btrfs_calc_trans_metadata_size(fs_info, | |
5912 | outstanding_extents + 1); | |
5913 | csum_leaves = btrfs_csum_bytes_to_leaves(fs_info, | |
5914 | inode->csum_bytes); | |
5915 | reserve_size += btrfs_calc_trans_metadata_size(fs_info, | |
5916 | csum_leaves); | |
ff6bc37e QW |
5917 | /* |
5918 | * For qgroup rsv, the calculation is very simple: | |
5919 | * account one nodesize for each outstanding extent | |
5920 | * | |
5921 | * This is overestimating in most cases. | |
5922 | */ | |
5923 | qgroup_rsv_size = outstanding_extents * fs_info->nodesize; | |
9e0baf60 | 5924 | |
69fe2d75 JB |
5925 | spin_lock(&block_rsv->lock); |
5926 | block_rsv->size = reserve_size; | |
ff6bc37e | 5927 | block_rsv->qgroup_rsv_size = qgroup_rsv_size; |
69fe2d75 | 5928 | spin_unlock(&block_rsv->lock); |
0ca1f7ce | 5929 | } |
c146afad | 5930 | |
9f3db423 | 5931 | int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes) |
0ca1f7ce | 5932 | { |
3ffbd68c | 5933 | struct btrfs_fs_info *fs_info = inode->root->fs_info; |
69fe2d75 | 5934 | unsigned nr_extents; |
08e007d2 | 5935 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 5936 | int ret = 0; |
c64c2bd8 | 5937 | bool delalloc_lock = true; |
6324fbf3 | 5938 | |
c64c2bd8 JB |
5939 | /* If we are a free space inode we need to not flush since we will be in |
5940 | * the middle of a transaction commit. We also don't need the delalloc | |
5941 | * mutex since we won't race with anybody. We need this mostly to make | |
5942 | * lockdep shut its filthy mouth. | |
bac357dc JB |
5943 | * |
5944 | * If we have a transaction open (can happen if we call truncate_block | |
5945 | * from truncate), then we need FLUSH_LIMIT so we don't deadlock. | |
c64c2bd8 JB |
5946 | */ |
5947 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 5948 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 | 5949 | delalloc_lock = false; |
da07d4ab NB |
5950 | } else { |
5951 | if (current->journal_info) | |
5952 | flush = BTRFS_RESERVE_FLUSH_LIMIT; | |
c09544e0 | 5953 | |
da07d4ab NB |
5954 | if (btrfs_transaction_in_commit(fs_info)) |
5955 | schedule_timeout(1); | |
5956 | } | |
ec44a35c | 5957 | |
c64c2bd8 | 5958 | if (delalloc_lock) |
9f3db423 | 5959 | mutex_lock(&inode->delalloc_mutex); |
c64c2bd8 | 5960 | |
0b246afa | 5961 | num_bytes = ALIGN(num_bytes, fs_info->sectorsize); |
69fe2d75 JB |
5962 | |
5963 | /* Add our new extents and calculate the new rsv size. */ | |
9f3db423 | 5964 | spin_lock(&inode->lock); |
69fe2d75 | 5965 | nr_extents = count_max_extents(num_bytes); |
8b62f87b | 5966 | btrfs_mod_outstanding_extents(inode, nr_extents); |
69fe2d75 JB |
5967 | inode->csum_bytes += num_bytes; |
5968 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); | |
9f3db423 | 5969 | spin_unlock(&inode->lock); |
57a45ced | 5970 | |
69fe2d75 | 5971 | ret = btrfs_inode_rsv_refill(inode, flush); |
43b18595 | 5972 | if (unlikely(ret)) |
88e081bf | 5973 | goto out_fail; |
25179201 | 5974 | |
c64c2bd8 | 5975 | if (delalloc_lock) |
9f3db423 | 5976 | mutex_unlock(&inode->delalloc_mutex); |
0ca1f7ce | 5977 | return 0; |
88e081bf WS |
5978 | |
5979 | out_fail: | |
9f3db423 | 5980 | spin_lock(&inode->lock); |
8b62f87b JB |
5981 | nr_extents = count_max_extents(num_bytes); |
5982 | btrfs_mod_outstanding_extents(inode, -nr_extents); | |
69fe2d75 JB |
5983 | inode->csum_bytes -= num_bytes; |
5984 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); | |
9f3db423 | 5985 | spin_unlock(&inode->lock); |
88e081bf | 5986 | |
43b18595 | 5987 | btrfs_inode_rsv_release(inode, true); |
88e081bf | 5988 | if (delalloc_lock) |
9f3db423 | 5989 | mutex_unlock(&inode->delalloc_mutex); |
88e081bf | 5990 | return ret; |
0ca1f7ce YZ |
5991 | } |
5992 | ||
7709cde3 JB |
5993 | /** |
5994 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
8b62f87b JB |
5995 | * @inode: the inode to release the reservation for. |
5996 | * @num_bytes: the number of bytes we are releasing. | |
43b18595 | 5997 | * @qgroup_free: free qgroup reservation or convert it to per-trans reservation |
7709cde3 JB |
5998 | * |
5999 | * This will release the metadata reservation for an inode. This can be called | |
6000 | * once we complete IO for a given set of bytes to release their metadata | |
8b62f87b | 6001 | * reservations, or on error for the same reason. |
7709cde3 | 6002 | */ |
43b18595 QW |
6003 | void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes, |
6004 | bool qgroup_free) | |
0ca1f7ce | 6005 | { |
3ffbd68c | 6006 | struct btrfs_fs_info *fs_info = inode->root->fs_info; |
0ca1f7ce | 6007 | |
0b246afa | 6008 | num_bytes = ALIGN(num_bytes, fs_info->sectorsize); |
691fa059 | 6009 | spin_lock(&inode->lock); |
69fe2d75 JB |
6010 | inode->csum_bytes -= num_bytes; |
6011 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); | |
691fa059 | 6012 | spin_unlock(&inode->lock); |
0ca1f7ce | 6013 | |
0b246afa | 6014 | if (btrfs_is_testing(fs_info)) |
6a3891c5 JB |
6015 | return; |
6016 | ||
43b18595 | 6017 | btrfs_inode_rsv_release(inode, qgroup_free); |
0ca1f7ce YZ |
6018 | } |
6019 | ||
8b62f87b JB |
6020 | /** |
6021 | * btrfs_delalloc_release_extents - release our outstanding_extents | |
6022 | * @inode: the inode to balance the reservation for. | |
6023 | * @num_bytes: the number of bytes we originally reserved with | |
43b18595 | 6024 | * @qgroup_free: do we need to free qgroup meta reservation or convert them. |
8b62f87b JB |
6025 | * |
6026 | * When we reserve space we increase outstanding_extents for the extents we may | |
6027 | * add. Once we've set the range as delalloc or created our ordered extents we | |
6028 | * have outstanding_extents to track the real usage, so we use this to free our | |
6029 | * temporarily tracked outstanding_extents. This _must_ be used in conjunction | |
6030 | * with btrfs_delalloc_reserve_metadata. | |
6031 | */ | |
43b18595 QW |
6032 | void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes, |
6033 | bool qgroup_free) | |
8b62f87b | 6034 | { |
3ffbd68c | 6035 | struct btrfs_fs_info *fs_info = inode->root->fs_info; |
8b62f87b | 6036 | unsigned num_extents; |
8b62f87b JB |
6037 | |
6038 | spin_lock(&inode->lock); | |
6039 | num_extents = count_max_extents(num_bytes); | |
6040 | btrfs_mod_outstanding_extents(inode, -num_extents); | |
69fe2d75 | 6041 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); |
8b62f87b JB |
6042 | spin_unlock(&inode->lock); |
6043 | ||
8b62f87b JB |
6044 | if (btrfs_is_testing(fs_info)) |
6045 | return; | |
6046 | ||
43b18595 | 6047 | btrfs_inode_rsv_release(inode, qgroup_free); |
8b62f87b JB |
6048 | } |
6049 | ||
1ada3a62 | 6050 | /** |
7cf5b976 | 6051 | * btrfs_delalloc_reserve_space - reserve data and metadata space for |
1ada3a62 QW |
6052 | * delalloc |
6053 | * @inode: inode we're writing to | |
6054 | * @start: start range we are writing to | |
6055 | * @len: how long the range we are writing to | |
364ecf36 QW |
6056 | * @reserved: mandatory parameter, record actually reserved qgroup ranges of |
6057 | * current reservation. | |
1ada3a62 | 6058 | * |
1ada3a62 QW |
6059 | * This will do the following things |
6060 | * | |
6061 | * o reserve space in data space info for num bytes | |
6062 | * and reserve precious corresponding qgroup space | |
6063 | * (Done in check_data_free_space) | |
6064 | * | |
6065 | * o reserve space for metadata space, based on the number of outstanding | |
6066 | * extents and how much csums will be needed | |
6067 | * also reserve metadata space in a per root over-reserve method. | |
6068 | * o add to the inodes->delalloc_bytes | |
6069 | * o add it to the fs_info's delalloc inodes list. | |
6070 | * (Above 3 all done in delalloc_reserve_metadata) | |
6071 | * | |
6072 | * Return 0 for success | |
6073 | * Return <0 for error(-ENOSPC or -EQUOT) | |
6074 | */ | |
364ecf36 QW |
6075 | int btrfs_delalloc_reserve_space(struct inode *inode, |
6076 | struct extent_changeset **reserved, u64 start, u64 len) | |
1ada3a62 QW |
6077 | { |
6078 | int ret; | |
6079 | ||
364ecf36 | 6080 | ret = btrfs_check_data_free_space(inode, reserved, start, len); |
1ada3a62 QW |
6081 | if (ret < 0) |
6082 | return ret; | |
9f3db423 | 6083 | ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), len); |
1ada3a62 | 6084 | if (ret < 0) |
bc42bda2 | 6085 | btrfs_free_reserved_data_space(inode, *reserved, start, len); |
1ada3a62 QW |
6086 | return ret; |
6087 | } | |
6088 | ||
7709cde3 | 6089 | /** |
7cf5b976 | 6090 | * btrfs_delalloc_release_space - release data and metadata space for delalloc |
1ada3a62 QW |
6091 | * @inode: inode we're releasing space for |
6092 | * @start: start position of the space already reserved | |
6093 | * @len: the len of the space already reserved | |
8b62f87b | 6094 | * @release_bytes: the len of the space we consumed or didn't use |
1ada3a62 QW |
6095 | * |
6096 | * This function will release the metadata space that was not used and will | |
6097 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
6098 | * list if there are no delalloc bytes left. | |
6099 | * Also it will handle the qgroup reserved space. | |
6100 | */ | |
bc42bda2 | 6101 | void btrfs_delalloc_release_space(struct inode *inode, |
8b62f87b | 6102 | struct extent_changeset *reserved, |
43b18595 | 6103 | u64 start, u64 len, bool qgroup_free) |
1ada3a62 | 6104 | { |
43b18595 | 6105 | btrfs_delalloc_release_metadata(BTRFS_I(inode), len, qgroup_free); |
bc42bda2 | 6106 | btrfs_free_reserved_data_space(inode, reserved, start, len); |
6324fbf3 CM |
6107 | } |
6108 | ||
ce93ec54 | 6109 | static int update_block_group(struct btrfs_trans_handle *trans, |
6202df69 | 6110 | struct btrfs_fs_info *info, u64 bytenr, |
ce93ec54 | 6111 | u64 num_bytes, int alloc) |
9078a3e1 | 6112 | { |
0af3d00b | 6113 | struct btrfs_block_group_cache *cache = NULL; |
db94535d | 6114 | u64 total = num_bytes; |
9078a3e1 | 6115 | u64 old_val; |
db94535d | 6116 | u64 byte_in_group; |
0af3d00b | 6117 | int factor; |
3e1ad54f | 6118 | |
5d4f98a2 | 6119 | /* block accounting for super block */ |
eb73c1b7 | 6120 | spin_lock(&info->delalloc_root_lock); |
6c41761f | 6121 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
6122 | if (alloc) |
6123 | old_val += num_bytes; | |
6124 | else | |
6125 | old_val -= num_bytes; | |
6c41761f | 6126 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
eb73c1b7 | 6127 | spin_unlock(&info->delalloc_root_lock); |
5d4f98a2 | 6128 | |
d397712b | 6129 | while (total) { |
db94535d | 6130 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 6131 | if (!cache) |
79787eaa | 6132 | return -ENOENT; |
46df06b8 DS |
6133 | factor = btrfs_bg_type_to_factor(cache->flags); |
6134 | ||
9d66e233 JB |
6135 | /* |
6136 | * If this block group has free space cache written out, we | |
6137 | * need to make sure to load it if we are removing space. This | |
6138 | * is because we need the unpinning stage to actually add the | |
6139 | * space back to the block group, otherwise we will leak space. | |
6140 | */ | |
6141 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 6142 | cache_block_group(cache, 1); |
0af3d00b | 6143 | |
db94535d CM |
6144 | byte_in_group = bytenr - cache->key.objectid; |
6145 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 6146 | |
25179201 | 6147 | spin_lock(&cache->space_info->lock); |
c286ac48 | 6148 | spin_lock(&cache->lock); |
0af3d00b | 6149 | |
6202df69 | 6150 | if (btrfs_test_opt(info, SPACE_CACHE) && |
0af3d00b JB |
6151 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
6152 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
6153 | ||
9078a3e1 | 6154 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 6155 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 6156 | if (alloc) { |
db94535d | 6157 | old_val += num_bytes; |
11833d66 YZ |
6158 | btrfs_set_block_group_used(&cache->item, old_val); |
6159 | cache->reserved -= num_bytes; | |
11833d66 | 6160 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
6161 | cache->space_info->bytes_used += num_bytes; |
6162 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 6163 | spin_unlock(&cache->lock); |
25179201 | 6164 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 6165 | } else { |
db94535d | 6166 | old_val -= num_bytes; |
ae0ab003 FM |
6167 | btrfs_set_block_group_used(&cache->item, old_val); |
6168 | cache->pinned += num_bytes; | |
e2907c1a | 6169 | update_bytes_pinned(cache->space_info, num_bytes); |
ae0ab003 FM |
6170 | cache->space_info->bytes_used -= num_bytes; |
6171 | cache->space_info->disk_used -= num_bytes * factor; | |
6172 | spin_unlock(&cache->lock); | |
6173 | spin_unlock(&cache->space_info->lock); | |
47ab2a6c | 6174 | |
0b246afa | 6175 | trace_btrfs_space_reservation(info, "pinned", |
c51e7bb1 JB |
6176 | cache->space_info->flags, |
6177 | num_bytes, 1); | |
dec59fa3 EL |
6178 | percpu_counter_add_batch(&cache->space_info->total_bytes_pinned, |
6179 | num_bytes, | |
6180 | BTRFS_TOTAL_BYTES_PINNED_BATCH); | |
ae0ab003 FM |
6181 | set_extent_dirty(info->pinned_extents, |
6182 | bytenr, bytenr + num_bytes - 1, | |
6183 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 6184 | } |
1bbc621e CM |
6185 | |
6186 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
6187 | if (list_empty(&cache->dirty_list)) { | |
6188 | list_add_tail(&cache->dirty_list, | |
6189 | &trans->transaction->dirty_bgs); | |
bece2e82 | 6190 | trans->transaction->num_dirty_bgs++; |
1bbc621e CM |
6191 | btrfs_get_block_group(cache); |
6192 | } | |
6193 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
6194 | ||
036a9348 FM |
6195 | /* |
6196 | * No longer have used bytes in this block group, queue it for | |
6197 | * deletion. We do this after adding the block group to the | |
6198 | * dirty list to avoid races between cleaner kthread and space | |
6199 | * cache writeout. | |
6200 | */ | |
031f24da QW |
6201 | if (!alloc && old_val == 0) |
6202 | btrfs_mark_bg_unused(cache); | |
036a9348 | 6203 | |
fa9c0d79 | 6204 | btrfs_put_block_group(cache); |
db94535d CM |
6205 | total -= num_bytes; |
6206 | bytenr += num_bytes; | |
9078a3e1 CM |
6207 | } |
6208 | return 0; | |
6209 | } | |
6324fbf3 | 6210 | |
2ff7e61e | 6211 | static u64 first_logical_byte(struct btrfs_fs_info *fs_info, u64 search_start) |
a061fc8d | 6212 | { |
0f9dd46c | 6213 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 6214 | u64 bytenr; |
0f9dd46c | 6215 | |
0b246afa JM |
6216 | spin_lock(&fs_info->block_group_cache_lock); |
6217 | bytenr = fs_info->first_logical_byte; | |
6218 | spin_unlock(&fs_info->block_group_cache_lock); | |
a1897fdd LB |
6219 | |
6220 | if (bytenr < (u64)-1) | |
6221 | return bytenr; | |
6222 | ||
0b246afa | 6223 | cache = btrfs_lookup_first_block_group(fs_info, search_start); |
0f9dd46c | 6224 | if (!cache) |
a061fc8d | 6225 | return 0; |
0f9dd46c | 6226 | |
d2fb3437 | 6227 | bytenr = cache->key.objectid; |
fa9c0d79 | 6228 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
6229 | |
6230 | return bytenr; | |
a061fc8d CM |
6231 | } |
6232 | ||
2ff7e61e | 6233 | static int pin_down_extent(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
6234 | struct btrfs_block_group_cache *cache, |
6235 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 6236 | { |
11833d66 YZ |
6237 | spin_lock(&cache->space_info->lock); |
6238 | spin_lock(&cache->lock); | |
6239 | cache->pinned += num_bytes; | |
e2907c1a | 6240 | update_bytes_pinned(cache->space_info, num_bytes); |
11833d66 YZ |
6241 | if (reserved) { |
6242 | cache->reserved -= num_bytes; | |
6243 | cache->space_info->bytes_reserved -= num_bytes; | |
6244 | } | |
6245 | spin_unlock(&cache->lock); | |
6246 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 6247 | |
0b246afa | 6248 | trace_btrfs_space_reservation(fs_info, "pinned", |
c51e7bb1 | 6249 | cache->space_info->flags, num_bytes, 1); |
dec59fa3 EL |
6250 | percpu_counter_add_batch(&cache->space_info->total_bytes_pinned, |
6251 | num_bytes, BTRFS_TOTAL_BYTES_PINNED_BATCH); | |
0b246afa | 6252 | set_extent_dirty(fs_info->pinned_extents, bytenr, |
f0486c68 YZ |
6253 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); |
6254 | return 0; | |
6255 | } | |
68b38550 | 6256 | |
f0486c68 YZ |
6257 | /* |
6258 | * this function must be called within transaction | |
6259 | */ | |
2ff7e61e | 6260 | int btrfs_pin_extent(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
6261 | u64 bytenr, u64 num_bytes, int reserved) |
6262 | { | |
6263 | struct btrfs_block_group_cache *cache; | |
68b38550 | 6264 | |
0b246afa | 6265 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
79787eaa | 6266 | BUG_ON(!cache); /* Logic error */ |
f0486c68 | 6267 | |
2ff7e61e | 6268 | pin_down_extent(fs_info, cache, bytenr, num_bytes, reserved); |
f0486c68 YZ |
6269 | |
6270 | btrfs_put_block_group(cache); | |
11833d66 YZ |
6271 | return 0; |
6272 | } | |
6273 | ||
f0486c68 | 6274 | /* |
e688b725 CM |
6275 | * this function must be called within transaction |
6276 | */ | |
2ff7e61e | 6277 | int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info, |
e688b725 CM |
6278 | u64 bytenr, u64 num_bytes) |
6279 | { | |
6280 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 6281 | int ret; |
e688b725 | 6282 | |
0b246afa | 6283 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
b50c6e25 JB |
6284 | if (!cache) |
6285 | return -EINVAL; | |
e688b725 CM |
6286 | |
6287 | /* | |
6288 | * pull in the free space cache (if any) so that our pin | |
6289 | * removes the free space from the cache. We have load_only set | |
6290 | * to one because the slow code to read in the free extents does check | |
6291 | * the pinned extents. | |
6292 | */ | |
f6373bf3 | 6293 | cache_block_group(cache, 1); |
e688b725 | 6294 | |
2ff7e61e | 6295 | pin_down_extent(fs_info, cache, bytenr, num_bytes, 0); |
e688b725 CM |
6296 | |
6297 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 6298 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 6299 | btrfs_put_block_group(cache); |
b50c6e25 | 6300 | return ret; |
e688b725 CM |
6301 | } |
6302 | ||
2ff7e61e JM |
6303 | static int __exclude_logged_extent(struct btrfs_fs_info *fs_info, |
6304 | u64 start, u64 num_bytes) | |
8c2a1a30 JB |
6305 | { |
6306 | int ret; | |
6307 | struct btrfs_block_group_cache *block_group; | |
6308 | struct btrfs_caching_control *caching_ctl; | |
6309 | ||
0b246afa | 6310 | block_group = btrfs_lookup_block_group(fs_info, start); |
8c2a1a30 JB |
6311 | if (!block_group) |
6312 | return -EINVAL; | |
6313 | ||
6314 | cache_block_group(block_group, 0); | |
6315 | caching_ctl = get_caching_control(block_group); | |
6316 | ||
6317 | if (!caching_ctl) { | |
6318 | /* Logic error */ | |
6319 | BUG_ON(!block_group_cache_done(block_group)); | |
6320 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
6321 | } else { | |
6322 | mutex_lock(&caching_ctl->mutex); | |
6323 | ||
6324 | if (start >= caching_ctl->progress) { | |
2ff7e61e | 6325 | ret = add_excluded_extent(fs_info, start, num_bytes); |
8c2a1a30 JB |
6326 | } else if (start + num_bytes <= caching_ctl->progress) { |
6327 | ret = btrfs_remove_free_space(block_group, | |
6328 | start, num_bytes); | |
6329 | } else { | |
6330 | num_bytes = caching_ctl->progress - start; | |
6331 | ret = btrfs_remove_free_space(block_group, | |
6332 | start, num_bytes); | |
6333 | if (ret) | |
6334 | goto out_lock; | |
6335 | ||
6336 | num_bytes = (start + num_bytes) - | |
6337 | caching_ctl->progress; | |
6338 | start = caching_ctl->progress; | |
2ff7e61e | 6339 | ret = add_excluded_extent(fs_info, start, num_bytes); |
8c2a1a30 JB |
6340 | } |
6341 | out_lock: | |
6342 | mutex_unlock(&caching_ctl->mutex); | |
6343 | put_caching_control(caching_ctl); | |
6344 | } | |
6345 | btrfs_put_block_group(block_group); | |
6346 | return ret; | |
6347 | } | |
6348 | ||
2ff7e61e | 6349 | int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info, |
8c2a1a30 JB |
6350 | struct extent_buffer *eb) |
6351 | { | |
6352 | struct btrfs_file_extent_item *item; | |
6353 | struct btrfs_key key; | |
6354 | int found_type; | |
6355 | int i; | |
b89311ef | 6356 | int ret = 0; |
8c2a1a30 | 6357 | |
2ff7e61e | 6358 | if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS)) |
8c2a1a30 JB |
6359 | return 0; |
6360 | ||
6361 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
6362 | btrfs_item_key_to_cpu(eb, &key, i); | |
6363 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
6364 | continue; | |
6365 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
6366 | found_type = btrfs_file_extent_type(eb, item); | |
6367 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
6368 | continue; | |
6369 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
6370 | continue; | |
6371 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
6372 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
b89311ef GJ |
6373 | ret = __exclude_logged_extent(fs_info, key.objectid, key.offset); |
6374 | if (ret) | |
6375 | break; | |
8c2a1a30 JB |
6376 | } |
6377 | ||
b89311ef | 6378 | return ret; |
8c2a1a30 JB |
6379 | } |
6380 | ||
9cfa3e34 FM |
6381 | static void |
6382 | btrfs_inc_block_group_reservations(struct btrfs_block_group_cache *bg) | |
6383 | { | |
6384 | atomic_inc(&bg->reservations); | |
6385 | } | |
6386 | ||
6387 | void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info, | |
6388 | const u64 start) | |
6389 | { | |
6390 | struct btrfs_block_group_cache *bg; | |
6391 | ||
6392 | bg = btrfs_lookup_block_group(fs_info, start); | |
6393 | ASSERT(bg); | |
6394 | if (atomic_dec_and_test(&bg->reservations)) | |
4625956a | 6395 | wake_up_var(&bg->reservations); |
9cfa3e34 FM |
6396 | btrfs_put_block_group(bg); |
6397 | } | |
6398 | ||
9cfa3e34 FM |
6399 | void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg) |
6400 | { | |
6401 | struct btrfs_space_info *space_info = bg->space_info; | |
6402 | ||
6403 | ASSERT(bg->ro); | |
6404 | ||
6405 | if (!(bg->flags & BTRFS_BLOCK_GROUP_DATA)) | |
6406 | return; | |
6407 | ||
6408 | /* | |
6409 | * Our block group is read only but before we set it to read only, | |
6410 | * some task might have had allocated an extent from it already, but it | |
6411 | * has not yet created a respective ordered extent (and added it to a | |
6412 | * root's list of ordered extents). | |
6413 | * Therefore wait for any task currently allocating extents, since the | |
6414 | * block group's reservations counter is incremented while a read lock | |
6415 | * on the groups' semaphore is held and decremented after releasing | |
6416 | * the read access on that semaphore and creating the ordered extent. | |
6417 | */ | |
6418 | down_write(&space_info->groups_sem); | |
6419 | up_write(&space_info->groups_sem); | |
6420 | ||
4625956a | 6421 | wait_var_event(&bg->reservations, !atomic_read(&bg->reservations)); |
9cfa3e34 FM |
6422 | } |
6423 | ||
fb25e914 | 6424 | /** |
4824f1f4 | 6425 | * btrfs_add_reserved_bytes - update the block_group and space info counters |
fb25e914 | 6426 | * @cache: The cache we are manipulating |
18513091 WX |
6427 | * @ram_bytes: The number of bytes of file content, and will be same to |
6428 | * @num_bytes except for the compress path. | |
fb25e914 | 6429 | * @num_bytes: The number of bytes in question |
e570fd27 | 6430 | * @delalloc: The blocks are allocated for the delalloc write |
fb25e914 | 6431 | * |
745699ef XW |
6432 | * This is called by the allocator when it reserves space. If this is a |
6433 | * reservation and the block group has become read only we cannot make the | |
6434 | * reservation and return -EAGAIN, otherwise this function always succeeds. | |
f0486c68 | 6435 | */ |
4824f1f4 | 6436 | static int btrfs_add_reserved_bytes(struct btrfs_block_group_cache *cache, |
18513091 | 6437 | u64 ram_bytes, u64 num_bytes, int delalloc) |
11833d66 | 6438 | { |
fb25e914 | 6439 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 6440 | int ret = 0; |
79787eaa | 6441 | |
fb25e914 JB |
6442 | spin_lock(&space_info->lock); |
6443 | spin_lock(&cache->lock); | |
4824f1f4 WX |
6444 | if (cache->ro) { |
6445 | ret = -EAGAIN; | |
fb25e914 | 6446 | } else { |
4824f1f4 WX |
6447 | cache->reserved += num_bytes; |
6448 | space_info->bytes_reserved += num_bytes; | |
9f9b8e8d | 6449 | update_bytes_may_use(space_info, -ram_bytes); |
e570fd27 | 6450 | if (delalloc) |
4824f1f4 | 6451 | cache->delalloc_bytes += num_bytes; |
324ae4df | 6452 | } |
fb25e914 JB |
6453 | spin_unlock(&cache->lock); |
6454 | spin_unlock(&space_info->lock); | |
f0486c68 | 6455 | return ret; |
324ae4df | 6456 | } |
9078a3e1 | 6457 | |
4824f1f4 WX |
6458 | /** |
6459 | * btrfs_free_reserved_bytes - update the block_group and space info counters | |
6460 | * @cache: The cache we are manipulating | |
6461 | * @num_bytes: The number of bytes in question | |
6462 | * @delalloc: The blocks are allocated for the delalloc write | |
6463 | * | |
6464 | * This is called by somebody who is freeing space that was never actually used | |
6465 | * on disk. For example if you reserve some space for a new leaf in transaction | |
6466 | * A and before transaction A commits you free that leaf, you call this with | |
6467 | * reserve set to 0 in order to clear the reservation. | |
6468 | */ | |
6469 | ||
556f3ca8 | 6470 | static void btrfs_free_reserved_bytes(struct btrfs_block_group_cache *cache, |
6471 | u64 num_bytes, int delalloc) | |
4824f1f4 WX |
6472 | { |
6473 | struct btrfs_space_info *space_info = cache->space_info; | |
4824f1f4 WX |
6474 | |
6475 | spin_lock(&space_info->lock); | |
6476 | spin_lock(&cache->lock); | |
6477 | if (cache->ro) | |
6478 | space_info->bytes_readonly += num_bytes; | |
6479 | cache->reserved -= num_bytes; | |
6480 | space_info->bytes_reserved -= num_bytes; | |
21a94f7a | 6481 | space_info->max_extent_size = 0; |
4824f1f4 WX |
6482 | |
6483 | if (delalloc) | |
6484 | cache->delalloc_bytes -= num_bytes; | |
6485 | spin_unlock(&cache->lock); | |
6486 | spin_unlock(&space_info->lock); | |
4824f1f4 | 6487 | } |
8b74c03e | 6488 | void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info) |
e8569813 | 6489 | { |
11833d66 YZ |
6490 | struct btrfs_caching_control *next; |
6491 | struct btrfs_caching_control *caching_ctl; | |
6492 | struct btrfs_block_group_cache *cache; | |
e8569813 | 6493 | |
9e351cc8 | 6494 | down_write(&fs_info->commit_root_sem); |
25179201 | 6495 | |
11833d66 YZ |
6496 | list_for_each_entry_safe(caching_ctl, next, |
6497 | &fs_info->caching_block_groups, list) { | |
6498 | cache = caching_ctl->block_group; | |
6499 | if (block_group_cache_done(cache)) { | |
6500 | cache->last_byte_to_unpin = (u64)-1; | |
6501 | list_del_init(&caching_ctl->list); | |
6502 | put_caching_control(caching_ctl); | |
e8569813 | 6503 | } else { |
11833d66 | 6504 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 6505 | } |
e8569813 | 6506 | } |
11833d66 YZ |
6507 | |
6508 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
6509 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
6510 | else | |
6511 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
6512 | ||
9e351cc8 | 6513 | up_write(&fs_info->commit_root_sem); |
8929ecfa YZ |
6514 | |
6515 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
6516 | } |
6517 | ||
c759c4e1 JB |
6518 | /* |
6519 | * Returns the free cluster for the given space info and sets empty_cluster to | |
6520 | * what it should be based on the mount options. | |
6521 | */ | |
6522 | static struct btrfs_free_cluster * | |
2ff7e61e JM |
6523 | fetch_cluster_info(struct btrfs_fs_info *fs_info, |
6524 | struct btrfs_space_info *space_info, u64 *empty_cluster) | |
c759c4e1 JB |
6525 | { |
6526 | struct btrfs_free_cluster *ret = NULL; | |
c759c4e1 JB |
6527 | |
6528 | *empty_cluster = 0; | |
6529 | if (btrfs_mixed_space_info(space_info)) | |
6530 | return ret; | |
6531 | ||
c759c4e1 | 6532 | if (space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { |
0b246afa | 6533 | ret = &fs_info->meta_alloc_cluster; |
583b7231 HK |
6534 | if (btrfs_test_opt(fs_info, SSD)) |
6535 | *empty_cluster = SZ_2M; | |
6536 | else | |
ee22184b | 6537 | *empty_cluster = SZ_64K; |
583b7231 HK |
6538 | } else if ((space_info->flags & BTRFS_BLOCK_GROUP_DATA) && |
6539 | btrfs_test_opt(fs_info, SSD_SPREAD)) { | |
6540 | *empty_cluster = SZ_2M; | |
0b246afa | 6541 | ret = &fs_info->data_alloc_cluster; |
c759c4e1 JB |
6542 | } |
6543 | ||
6544 | return ret; | |
6545 | } | |
6546 | ||
2ff7e61e JM |
6547 | static int unpin_extent_range(struct btrfs_fs_info *fs_info, |
6548 | u64 start, u64 end, | |
678886bd | 6549 | const bool return_free_space) |
ccd467d6 | 6550 | { |
11833d66 | 6551 | struct btrfs_block_group_cache *cache = NULL; |
7b398f8e JB |
6552 | struct btrfs_space_info *space_info; |
6553 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
c759c4e1 | 6554 | struct btrfs_free_cluster *cluster = NULL; |
11833d66 | 6555 | u64 len; |
c759c4e1 JB |
6556 | u64 total_unpinned = 0; |
6557 | u64 empty_cluster = 0; | |
7b398f8e | 6558 | bool readonly; |
ccd467d6 | 6559 | |
11833d66 | 6560 | while (start <= end) { |
7b398f8e | 6561 | readonly = false; |
11833d66 YZ |
6562 | if (!cache || |
6563 | start >= cache->key.objectid + cache->key.offset) { | |
6564 | if (cache) | |
6565 | btrfs_put_block_group(cache); | |
c759c4e1 | 6566 | total_unpinned = 0; |
11833d66 | 6567 | cache = btrfs_lookup_block_group(fs_info, start); |
79787eaa | 6568 | BUG_ON(!cache); /* Logic error */ |
c759c4e1 | 6569 | |
2ff7e61e | 6570 | cluster = fetch_cluster_info(fs_info, |
c759c4e1 JB |
6571 | cache->space_info, |
6572 | &empty_cluster); | |
6573 | empty_cluster <<= 1; | |
11833d66 YZ |
6574 | } |
6575 | ||
6576 | len = cache->key.objectid + cache->key.offset - start; | |
6577 | len = min(len, end + 1 - start); | |
6578 | ||
6579 | if (start < cache->last_byte_to_unpin) { | |
6580 | len = min(len, cache->last_byte_to_unpin - start); | |
678886bd FM |
6581 | if (return_free_space) |
6582 | btrfs_add_free_space(cache, start, len); | |
11833d66 YZ |
6583 | } |
6584 | ||
f0486c68 | 6585 | start += len; |
c759c4e1 | 6586 | total_unpinned += len; |
7b398f8e | 6587 | space_info = cache->space_info; |
f0486c68 | 6588 | |
c759c4e1 JB |
6589 | /* |
6590 | * If this space cluster has been marked as fragmented and we've | |
6591 | * unpinned enough in this block group to potentially allow a | |
6592 | * cluster to be created inside of it go ahead and clear the | |
6593 | * fragmented check. | |
6594 | */ | |
6595 | if (cluster && cluster->fragmented && | |
6596 | total_unpinned > empty_cluster) { | |
6597 | spin_lock(&cluster->lock); | |
6598 | cluster->fragmented = 0; | |
6599 | spin_unlock(&cluster->lock); | |
6600 | } | |
6601 | ||
7b398f8e | 6602 | spin_lock(&space_info->lock); |
11833d66 YZ |
6603 | spin_lock(&cache->lock); |
6604 | cache->pinned -= len; | |
e2907c1a | 6605 | update_bytes_pinned(space_info, -len); |
c51e7bb1 JB |
6606 | |
6607 | trace_btrfs_space_reservation(fs_info, "pinned", | |
6608 | space_info->flags, len, 0); | |
4f4db217 | 6609 | space_info->max_extent_size = 0; |
dec59fa3 EL |
6610 | percpu_counter_add_batch(&space_info->total_bytes_pinned, |
6611 | -len, BTRFS_TOTAL_BYTES_PINNED_BATCH); | |
7b398f8e JB |
6612 | if (cache->ro) { |
6613 | space_info->bytes_readonly += len; | |
6614 | readonly = true; | |
6615 | } | |
11833d66 | 6616 | spin_unlock(&cache->lock); |
957780eb JB |
6617 | if (!readonly && return_free_space && |
6618 | global_rsv->space_info == space_info) { | |
6619 | u64 to_add = len; | |
92ac58ec | 6620 | |
7b398f8e JB |
6621 | spin_lock(&global_rsv->lock); |
6622 | if (!global_rsv->full) { | |
957780eb JB |
6623 | to_add = min(len, global_rsv->size - |
6624 | global_rsv->reserved); | |
6625 | global_rsv->reserved += to_add; | |
9f9b8e8d | 6626 | update_bytes_may_use(space_info, to_add); |
7b398f8e JB |
6627 | if (global_rsv->reserved >= global_rsv->size) |
6628 | global_rsv->full = 1; | |
957780eb JB |
6629 | trace_btrfs_space_reservation(fs_info, |
6630 | "space_info", | |
6631 | space_info->flags, | |
6632 | to_add, 1); | |
6633 | len -= to_add; | |
7b398f8e JB |
6634 | } |
6635 | spin_unlock(&global_rsv->lock); | |
957780eb JB |
6636 | /* Add to any tickets we may have */ |
6637 | if (len) | |
6638 | space_info_add_new_bytes(fs_info, space_info, | |
6639 | len); | |
7b398f8e JB |
6640 | } |
6641 | spin_unlock(&space_info->lock); | |
ccd467d6 | 6642 | } |
11833d66 YZ |
6643 | |
6644 | if (cache) | |
6645 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
6646 | return 0; |
6647 | } | |
6648 | ||
5ead2dd0 | 6649 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans) |
a28ec197 | 6650 | { |
5ead2dd0 | 6651 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e33e17ee JM |
6652 | struct btrfs_block_group_cache *block_group, *tmp; |
6653 | struct list_head *deleted_bgs; | |
11833d66 | 6654 | struct extent_io_tree *unpin; |
1a5bc167 CM |
6655 | u64 start; |
6656 | u64 end; | |
a28ec197 | 6657 | int ret; |
a28ec197 | 6658 | |
11833d66 YZ |
6659 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
6660 | unpin = &fs_info->freed_extents[1]; | |
6661 | else | |
6662 | unpin = &fs_info->freed_extents[0]; | |
6663 | ||
e33e17ee | 6664 | while (!trans->aborted) { |
0e6ec385 FM |
6665 | struct extent_state *cached_state = NULL; |
6666 | ||
d4b450cd | 6667 | mutex_lock(&fs_info->unused_bg_unpin_mutex); |
1a5bc167 | 6668 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
0e6ec385 | 6669 | EXTENT_DIRTY, &cached_state); |
d4b450cd FM |
6670 | if (ret) { |
6671 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
a28ec197 | 6672 | break; |
d4b450cd | 6673 | } |
1f3c79a2 | 6674 | |
0b246afa | 6675 | if (btrfs_test_opt(fs_info, DISCARD)) |
2ff7e61e | 6676 | ret = btrfs_discard_extent(fs_info, start, |
5378e607 | 6677 | end + 1 - start, NULL); |
1f3c79a2 | 6678 | |
0e6ec385 | 6679 | clear_extent_dirty(unpin, start, end, &cached_state); |
2ff7e61e | 6680 | unpin_extent_range(fs_info, start, end, true); |
d4b450cd | 6681 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
0e6ec385 | 6682 | free_extent_state(cached_state); |
b9473439 | 6683 | cond_resched(); |
a28ec197 | 6684 | } |
817d52f8 | 6685 | |
e33e17ee JM |
6686 | /* |
6687 | * Transaction is finished. We don't need the lock anymore. We | |
6688 | * do need to clean up the block groups in case of a transaction | |
6689 | * abort. | |
6690 | */ | |
6691 | deleted_bgs = &trans->transaction->deleted_bgs; | |
6692 | list_for_each_entry_safe(block_group, tmp, deleted_bgs, bg_list) { | |
6693 | u64 trimmed = 0; | |
6694 | ||
6695 | ret = -EROFS; | |
6696 | if (!trans->aborted) | |
2ff7e61e | 6697 | ret = btrfs_discard_extent(fs_info, |
e33e17ee JM |
6698 | block_group->key.objectid, |
6699 | block_group->key.offset, | |
6700 | &trimmed); | |
6701 | ||
6702 | list_del_init(&block_group->bg_list); | |
6703 | btrfs_put_block_group_trimming(block_group); | |
6704 | btrfs_put_block_group(block_group); | |
6705 | ||
6706 | if (ret) { | |
6707 | const char *errstr = btrfs_decode_error(ret); | |
6708 | btrfs_warn(fs_info, | |
913e1535 | 6709 | "discard failed while removing blockgroup: errno=%d %s", |
e33e17ee JM |
6710 | ret, errstr); |
6711 | } | |
6712 | } | |
6713 | ||
e20d96d6 CM |
6714 | return 0; |
6715 | } | |
6716 | ||
5d4f98a2 | 6717 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
e72cb923 NB |
6718 | struct btrfs_delayed_ref_node *node, u64 parent, |
6719 | u64 root_objectid, u64 owner_objectid, | |
6720 | u64 owner_offset, int refs_to_drop, | |
6721 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 6722 | { |
e72cb923 | 6723 | struct btrfs_fs_info *info = trans->fs_info; |
e2fa7227 | 6724 | struct btrfs_key key; |
5d4f98a2 | 6725 | struct btrfs_path *path; |
1261ec42 | 6726 | struct btrfs_root *extent_root = info->extent_root; |
5f39d397 | 6727 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
6728 | struct btrfs_extent_item *ei; |
6729 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 6730 | int ret; |
5d4f98a2 | 6731 | int is_data; |
952fccac CM |
6732 | int extent_slot = 0; |
6733 | int found_extent = 0; | |
6734 | int num_to_del = 1; | |
5d4f98a2 YZ |
6735 | u32 item_size; |
6736 | u64 refs; | |
c682f9b3 QW |
6737 | u64 bytenr = node->bytenr; |
6738 | u64 num_bytes = node->num_bytes; | |
fcebe456 | 6739 | int last_ref = 0; |
0b246afa | 6740 | bool skinny_metadata = btrfs_fs_incompat(info, SKINNY_METADATA); |
037e6390 | 6741 | |
5caf2a00 | 6742 | path = btrfs_alloc_path(); |
54aa1f4d CM |
6743 | if (!path) |
6744 | return -ENOMEM; | |
5f26f772 | 6745 | |
e4058b54 | 6746 | path->reada = READA_FORWARD; |
b9473439 | 6747 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6748 | |
6749 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
6750 | BUG_ON(!is_data && refs_to_drop != 1); | |
6751 | ||
3173a18f | 6752 | if (is_data) |
897ca819 | 6753 | skinny_metadata = false; |
3173a18f | 6754 | |
fbe4801b NB |
6755 | ret = lookup_extent_backref(trans, path, &iref, bytenr, num_bytes, |
6756 | parent, root_objectid, owner_objectid, | |
5d4f98a2 | 6757 | owner_offset); |
7bb86316 | 6758 | if (ret == 0) { |
952fccac | 6759 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
6760 | while (extent_slot >= 0) { |
6761 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 6762 | extent_slot); |
5d4f98a2 | 6763 | if (key.objectid != bytenr) |
952fccac | 6764 | break; |
5d4f98a2 YZ |
6765 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
6766 | key.offset == num_bytes) { | |
952fccac CM |
6767 | found_extent = 1; |
6768 | break; | |
6769 | } | |
3173a18f JB |
6770 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
6771 | key.offset == owner_objectid) { | |
6772 | found_extent = 1; | |
6773 | break; | |
6774 | } | |
952fccac CM |
6775 | if (path->slots[0] - extent_slot > 5) |
6776 | break; | |
5d4f98a2 | 6777 | extent_slot--; |
952fccac | 6778 | } |
a79865c6 | 6779 | |
31840ae1 | 6780 | if (!found_extent) { |
5d4f98a2 | 6781 | BUG_ON(iref); |
87cc7a8a | 6782 | ret = remove_extent_backref(trans, path, NULL, |
87bde3cd | 6783 | refs_to_drop, |
fcebe456 | 6784 | is_data, &last_ref); |
005d6427 | 6785 | if (ret) { |
66642832 | 6786 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6787 | goto out; |
6788 | } | |
b3b4aa74 | 6789 | btrfs_release_path(path); |
b9473439 | 6790 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6791 | |
6792 | key.objectid = bytenr; | |
6793 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
6794 | key.offset = num_bytes; | |
6795 | ||
3173a18f JB |
6796 | if (!is_data && skinny_metadata) { |
6797 | key.type = BTRFS_METADATA_ITEM_KEY; | |
6798 | key.offset = owner_objectid; | |
6799 | } | |
6800 | ||
31840ae1 ZY |
6801 | ret = btrfs_search_slot(trans, extent_root, |
6802 | &key, path, -1, 1); | |
3173a18f JB |
6803 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
6804 | /* | |
6805 | * Couldn't find our skinny metadata item, | |
6806 | * see if we have ye olde extent item. | |
6807 | */ | |
6808 | path->slots[0]--; | |
6809 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
6810 | path->slots[0]); | |
6811 | if (key.objectid == bytenr && | |
6812 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
6813 | key.offset == num_bytes) | |
6814 | ret = 0; | |
6815 | } | |
6816 | ||
6817 | if (ret > 0 && skinny_metadata) { | |
6818 | skinny_metadata = false; | |
9ce49a0b | 6819 | key.objectid = bytenr; |
3173a18f JB |
6820 | key.type = BTRFS_EXTENT_ITEM_KEY; |
6821 | key.offset = num_bytes; | |
6822 | btrfs_release_path(path); | |
6823 | ret = btrfs_search_slot(trans, extent_root, | |
6824 | &key, path, -1, 1); | |
6825 | } | |
6826 | ||
f3465ca4 | 6827 | if (ret) { |
5d163e0e JM |
6828 | btrfs_err(info, |
6829 | "umm, got %d back from search, was looking for %llu", | |
6830 | ret, bytenr); | |
b783e62d | 6831 | if (ret > 0) |
a4f78750 | 6832 | btrfs_print_leaf(path->nodes[0]); |
f3465ca4 | 6833 | } |
005d6427 | 6834 | if (ret < 0) { |
66642832 | 6835 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6836 | goto out; |
6837 | } | |
31840ae1 ZY |
6838 | extent_slot = path->slots[0]; |
6839 | } | |
fae7f21c | 6840 | } else if (WARN_ON(ret == -ENOENT)) { |
a4f78750 | 6841 | btrfs_print_leaf(path->nodes[0]); |
c2cf52eb SK |
6842 | btrfs_err(info, |
6843 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
c1c9ff7c GU |
6844 | bytenr, parent, root_objectid, owner_objectid, |
6845 | owner_offset); | |
66642832 | 6846 | btrfs_abort_transaction(trans, ret); |
c4a050bb | 6847 | goto out; |
79787eaa | 6848 | } else { |
66642832 | 6849 | btrfs_abort_transaction(trans, ret); |
005d6427 | 6850 | goto out; |
7bb86316 | 6851 | } |
5f39d397 CM |
6852 | |
6853 | leaf = path->nodes[0]; | |
5d4f98a2 | 6854 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
6d8ff4e4 | 6855 | if (unlikely(item_size < sizeof(*ei))) { |
ba3c2b19 NB |
6856 | ret = -EINVAL; |
6857 | btrfs_print_v0_err(info); | |
6858 | btrfs_abort_transaction(trans, ret); | |
6859 | goto out; | |
6860 | } | |
952fccac | 6861 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 6862 | struct btrfs_extent_item); |
3173a18f JB |
6863 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
6864 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
6865 | struct btrfs_tree_block_info *bi; |
6866 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
6867 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
6868 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
6869 | } | |
56bec294 | 6870 | |
5d4f98a2 | 6871 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 | 6872 | if (refs < refs_to_drop) { |
5d163e0e JM |
6873 | btrfs_err(info, |
6874 | "trying to drop %d refs but we only have %Lu for bytenr %Lu", | |
6875 | refs_to_drop, refs, bytenr); | |
32b02538 | 6876 | ret = -EINVAL; |
66642832 | 6877 | btrfs_abort_transaction(trans, ret); |
32b02538 JB |
6878 | goto out; |
6879 | } | |
56bec294 | 6880 | refs -= refs_to_drop; |
5f39d397 | 6881 | |
5d4f98a2 YZ |
6882 | if (refs > 0) { |
6883 | if (extent_op) | |
6884 | __run_delayed_extent_op(extent_op, leaf, ei); | |
6885 | /* | |
6886 | * In the case of inline back ref, reference count will | |
6887 | * be updated by remove_extent_backref | |
952fccac | 6888 | */ |
5d4f98a2 YZ |
6889 | if (iref) { |
6890 | BUG_ON(!found_extent); | |
6891 | } else { | |
6892 | btrfs_set_extent_refs(leaf, ei, refs); | |
6893 | btrfs_mark_buffer_dirty(leaf); | |
6894 | } | |
6895 | if (found_extent) { | |
87cc7a8a NB |
6896 | ret = remove_extent_backref(trans, path, iref, |
6897 | refs_to_drop, is_data, | |
6898 | &last_ref); | |
005d6427 | 6899 | if (ret) { |
66642832 | 6900 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6901 | goto out; |
6902 | } | |
952fccac | 6903 | } |
5d4f98a2 | 6904 | } else { |
5d4f98a2 YZ |
6905 | if (found_extent) { |
6906 | BUG_ON(is_data && refs_to_drop != | |
9ed0dea0 | 6907 | extent_data_ref_count(path, iref)); |
5d4f98a2 YZ |
6908 | if (iref) { |
6909 | BUG_ON(path->slots[0] != extent_slot); | |
6910 | } else { | |
6911 | BUG_ON(path->slots[0] != extent_slot + 1); | |
6912 | path->slots[0] = extent_slot; | |
6913 | num_to_del = 2; | |
6914 | } | |
78fae27e | 6915 | } |
b9473439 | 6916 | |
fcebe456 | 6917 | last_ref = 1; |
952fccac CM |
6918 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
6919 | num_to_del); | |
005d6427 | 6920 | if (ret) { |
66642832 | 6921 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6922 | goto out; |
6923 | } | |
b3b4aa74 | 6924 | btrfs_release_path(path); |
21af804c | 6925 | |
5d4f98a2 | 6926 | if (is_data) { |
5b4aacef | 6927 | ret = btrfs_del_csums(trans, info, bytenr, num_bytes); |
005d6427 | 6928 | if (ret) { |
66642832 | 6929 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6930 | goto out; |
6931 | } | |
459931ec CM |
6932 | } |
6933 | ||
e7355e50 | 6934 | ret = add_to_free_space_tree(trans, bytenr, num_bytes); |
1e144fb8 | 6935 | if (ret) { |
66642832 | 6936 | btrfs_abort_transaction(trans, ret); |
1e144fb8 OS |
6937 | goto out; |
6938 | } | |
6939 | ||
0b246afa | 6940 | ret = update_block_group(trans, info, bytenr, num_bytes, 0); |
005d6427 | 6941 | if (ret) { |
66642832 | 6942 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6943 | goto out; |
6944 | } | |
a28ec197 | 6945 | } |
fcebe456 JB |
6946 | btrfs_release_path(path); |
6947 | ||
79787eaa | 6948 | out: |
5caf2a00 | 6949 | btrfs_free_path(path); |
a28ec197 CM |
6950 | return ret; |
6951 | } | |
6952 | ||
1887be66 | 6953 | /* |
f0486c68 | 6954 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
6955 | * delayed ref for that extent as well. This searches the delayed ref tree for |
6956 | * a given extent, and if there are no other delayed refs to be processed, it | |
6957 | * removes it from the tree. | |
6958 | */ | |
6959 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
2ff7e61e | 6960 | u64 bytenr) |
1887be66 CM |
6961 | { |
6962 | struct btrfs_delayed_ref_head *head; | |
6963 | struct btrfs_delayed_ref_root *delayed_refs; | |
f0486c68 | 6964 | int ret = 0; |
1887be66 CM |
6965 | |
6966 | delayed_refs = &trans->transaction->delayed_refs; | |
6967 | spin_lock(&delayed_refs->lock); | |
f72ad18e | 6968 | head = btrfs_find_delayed_ref_head(delayed_refs, bytenr); |
1887be66 | 6969 | if (!head) |
cf93da7b | 6970 | goto out_delayed_unlock; |
1887be66 | 6971 | |
d7df2c79 | 6972 | spin_lock(&head->lock); |
e3d03965 | 6973 | if (!RB_EMPTY_ROOT(&head->ref_tree.rb_root)) |
1887be66 CM |
6974 | goto out; |
6975 | ||
5d4f98a2 YZ |
6976 | if (head->extent_op) { |
6977 | if (!head->must_insert_reserved) | |
6978 | goto out; | |
78a6184a | 6979 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
6980 | head->extent_op = NULL; |
6981 | } | |
6982 | ||
1887be66 CM |
6983 | /* |
6984 | * waiting for the lock here would deadlock. If someone else has it | |
6985 | * locked they are already in the process of dropping it anyway | |
6986 | */ | |
6987 | if (!mutex_trylock(&head->mutex)) | |
6988 | goto out; | |
6989 | ||
6990 | /* | |
6991 | * at this point we have a head with no other entries. Go | |
6992 | * ahead and process it. | |
6993 | */ | |
5c9d028b | 6994 | rb_erase_cached(&head->href_node, &delayed_refs->href_root); |
d278850e | 6995 | RB_CLEAR_NODE(&head->href_node); |
d7df2c79 | 6996 | atomic_dec(&delayed_refs->num_entries); |
1887be66 CM |
6997 | |
6998 | /* | |
6999 | * we don't take a ref on the node because we're removing it from the | |
7000 | * tree, so we just steal the ref the tree was holding. | |
7001 | */ | |
c3e69d58 | 7002 | delayed_refs->num_heads--; |
d7df2c79 | 7003 | if (head->processing == 0) |
c3e69d58 | 7004 | delayed_refs->num_heads_ready--; |
d7df2c79 JB |
7005 | head->processing = 0; |
7006 | spin_unlock(&head->lock); | |
1887be66 CM |
7007 | spin_unlock(&delayed_refs->lock); |
7008 | ||
f0486c68 YZ |
7009 | BUG_ON(head->extent_op); |
7010 | if (head->must_insert_reserved) | |
7011 | ret = 1; | |
7012 | ||
7013 | mutex_unlock(&head->mutex); | |
d278850e | 7014 | btrfs_put_delayed_ref_head(head); |
f0486c68 | 7015 | return ret; |
1887be66 | 7016 | out: |
d7df2c79 | 7017 | spin_unlock(&head->lock); |
cf93da7b CM |
7018 | |
7019 | out_delayed_unlock: | |
1887be66 CM |
7020 | spin_unlock(&delayed_refs->lock); |
7021 | return 0; | |
7022 | } | |
7023 | ||
f0486c68 YZ |
7024 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
7025 | struct btrfs_root *root, | |
7026 | struct extent_buffer *buf, | |
5581a51a | 7027 | u64 parent, int last_ref) |
f0486c68 | 7028 | { |
0b246afa | 7029 | struct btrfs_fs_info *fs_info = root->fs_info; |
b150a4f1 | 7030 | int pin = 1; |
f0486c68 YZ |
7031 | int ret; |
7032 | ||
7033 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
d7eae340 OS |
7034 | int old_ref_mod, new_ref_mod; |
7035 | ||
fd708b81 JB |
7036 | btrfs_ref_tree_mod(root, buf->start, buf->len, parent, |
7037 | root->root_key.objectid, | |
7038 | btrfs_header_level(buf), 0, | |
7039 | BTRFS_DROP_DELAYED_REF); | |
44e1c47d | 7040 | ret = btrfs_add_delayed_tree_ref(trans, buf->start, |
7be07912 | 7041 | buf->len, parent, |
0b246afa JM |
7042 | root->root_key.objectid, |
7043 | btrfs_header_level(buf), | |
7be07912 | 7044 | BTRFS_DROP_DELAYED_REF, NULL, |
d7eae340 | 7045 | &old_ref_mod, &new_ref_mod); |
79787eaa | 7046 | BUG_ON(ret); /* -ENOMEM */ |
d7eae340 | 7047 | pin = old_ref_mod >= 0 && new_ref_mod < 0; |
f0486c68 YZ |
7048 | } |
7049 | ||
0a16c7d7 | 7050 | if (last_ref && btrfs_header_generation(buf) == trans->transid) { |
6219872d FM |
7051 | struct btrfs_block_group_cache *cache; |
7052 | ||
f0486c68 | 7053 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
2ff7e61e | 7054 | ret = check_ref_cleanup(trans, buf->start); |
f0486c68 | 7055 | if (!ret) |
37be25bc | 7056 | goto out; |
f0486c68 YZ |
7057 | } |
7058 | ||
4da8b76d | 7059 | pin = 0; |
0b246afa | 7060 | cache = btrfs_lookup_block_group(fs_info, buf->start); |
6219872d | 7061 | |
f0486c68 | 7062 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
2ff7e61e JM |
7063 | pin_down_extent(fs_info, cache, buf->start, |
7064 | buf->len, 1); | |
6219872d | 7065 | btrfs_put_block_group(cache); |
37be25bc | 7066 | goto out; |
f0486c68 YZ |
7067 | } |
7068 | ||
7069 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
7070 | ||
7071 | btrfs_add_free_space(cache, buf->start, buf->len); | |
4824f1f4 | 7072 | btrfs_free_reserved_bytes(cache, buf->len, 0); |
6219872d | 7073 | btrfs_put_block_group(cache); |
71ff6437 | 7074 | trace_btrfs_reserved_extent_free(fs_info, buf->start, buf->len); |
f0486c68 YZ |
7075 | } |
7076 | out: | |
b150a4f1 | 7077 | if (pin) |
29d2b84c | 7078 | add_pinned_bytes(fs_info, buf->len, true, |
b150a4f1 JB |
7079 | root->root_key.objectid); |
7080 | ||
0a16c7d7 OS |
7081 | if (last_ref) { |
7082 | /* | |
7083 | * Deleting the buffer, clear the corrupt flag since it doesn't | |
7084 | * matter anymore. | |
7085 | */ | |
7086 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
7087 | } | |
f0486c68 YZ |
7088 | } |
7089 | ||
79787eaa | 7090 | /* Can return -ENOMEM */ |
2ff7e61e | 7091 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
84f7d8e6 | 7092 | struct btrfs_root *root, |
66d7e7f0 | 7093 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, |
b06c4bf5 | 7094 | u64 owner, u64 offset) |
925baedd | 7095 | { |
84f7d8e6 | 7096 | struct btrfs_fs_info *fs_info = root->fs_info; |
d7eae340 | 7097 | int old_ref_mod, new_ref_mod; |
925baedd CM |
7098 | int ret; |
7099 | ||
f5ee5c9a | 7100 | if (btrfs_is_testing(fs_info)) |
faa2dbf0 | 7101 | return 0; |
fccb84c9 | 7102 | |
fd708b81 JB |
7103 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) |
7104 | btrfs_ref_tree_mod(root, bytenr, num_bytes, parent, | |
7105 | root_objectid, owner, offset, | |
7106 | BTRFS_DROP_DELAYED_REF); | |
7107 | ||
56bec294 CM |
7108 | /* |
7109 | * tree log blocks never actually go into the extent allocation | |
7110 | * tree, just update pinning info and exit early. | |
56bec294 | 7111 | */ |
5d4f98a2 YZ |
7112 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
7113 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 7114 | /* unlocks the pinned mutex */ |
2ff7e61e | 7115 | btrfs_pin_extent(fs_info, bytenr, num_bytes, 1); |
d7eae340 | 7116 | old_ref_mod = new_ref_mod = 0; |
56bec294 | 7117 | ret = 0; |
5d4f98a2 | 7118 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
44e1c47d | 7119 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, |
7be07912 OS |
7120 | num_bytes, parent, |
7121 | root_objectid, (int)owner, | |
7122 | BTRFS_DROP_DELAYED_REF, NULL, | |
d7eae340 | 7123 | &old_ref_mod, &new_ref_mod); |
5d4f98a2 | 7124 | } else { |
88a979c6 | 7125 | ret = btrfs_add_delayed_data_ref(trans, bytenr, |
7be07912 OS |
7126 | num_bytes, parent, |
7127 | root_objectid, owner, offset, | |
7128 | 0, BTRFS_DROP_DELAYED_REF, | |
d7eae340 | 7129 | &old_ref_mod, &new_ref_mod); |
56bec294 | 7130 | } |
d7eae340 | 7131 | |
29d2b84c NB |
7132 | if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0) { |
7133 | bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID; | |
7134 | ||
7135 | add_pinned_bytes(fs_info, num_bytes, metadata, root_objectid); | |
7136 | } | |
d7eae340 | 7137 | |
925baedd CM |
7138 | return ret; |
7139 | } | |
7140 | ||
817d52f8 JB |
7141 | /* |
7142 | * when we wait for progress in the block group caching, its because | |
7143 | * our allocation attempt failed at least once. So, we must sleep | |
7144 | * and let some progress happen before we try again. | |
7145 | * | |
7146 | * This function will sleep at least once waiting for new free space to | |
7147 | * show up, and then it will check the block group free space numbers | |
7148 | * for our min num_bytes. Another option is to have it go ahead | |
7149 | * and look in the rbtree for a free extent of a given size, but this | |
7150 | * is a good start. | |
36cce922 JB |
7151 | * |
7152 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using | |
7153 | * any of the information in this block group. | |
817d52f8 | 7154 | */ |
36cce922 | 7155 | static noinline void |
817d52f8 JB |
7156 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
7157 | u64 num_bytes) | |
7158 | { | |
11833d66 | 7159 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 7160 | |
11833d66 YZ |
7161 | caching_ctl = get_caching_control(cache); |
7162 | if (!caching_ctl) | |
36cce922 | 7163 | return; |
817d52f8 | 7164 | |
11833d66 | 7165 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 7166 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
7167 | |
7168 | put_caching_control(caching_ctl); | |
11833d66 YZ |
7169 | } |
7170 | ||
7171 | static noinline int | |
7172 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
7173 | { | |
7174 | struct btrfs_caching_control *caching_ctl; | |
36cce922 | 7175 | int ret = 0; |
11833d66 YZ |
7176 | |
7177 | caching_ctl = get_caching_control(cache); | |
7178 | if (!caching_ctl) | |
36cce922 | 7179 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
11833d66 YZ |
7180 | |
7181 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
36cce922 JB |
7182 | if (cache->cached == BTRFS_CACHE_ERROR) |
7183 | ret = -EIO; | |
11833d66 | 7184 | put_caching_control(caching_ctl); |
36cce922 | 7185 | return ret; |
817d52f8 JB |
7186 | } |
7187 | ||
7188 | enum btrfs_loop_type { | |
285ff5af JB |
7189 | LOOP_CACHING_NOWAIT = 0, |
7190 | LOOP_CACHING_WAIT = 1, | |
7191 | LOOP_ALLOC_CHUNK = 2, | |
7192 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
7193 | }; |
7194 | ||
e570fd27 MX |
7195 | static inline void |
7196 | btrfs_lock_block_group(struct btrfs_block_group_cache *cache, | |
7197 | int delalloc) | |
7198 | { | |
7199 | if (delalloc) | |
7200 | down_read(&cache->data_rwsem); | |
7201 | } | |
7202 | ||
7203 | static inline void | |
7204 | btrfs_grab_block_group(struct btrfs_block_group_cache *cache, | |
7205 | int delalloc) | |
7206 | { | |
7207 | btrfs_get_block_group(cache); | |
7208 | if (delalloc) | |
7209 | down_read(&cache->data_rwsem); | |
7210 | } | |
7211 | ||
7212 | static struct btrfs_block_group_cache * | |
7213 | btrfs_lock_cluster(struct btrfs_block_group_cache *block_group, | |
7214 | struct btrfs_free_cluster *cluster, | |
7215 | int delalloc) | |
7216 | { | |
89771cc9 | 7217 | struct btrfs_block_group_cache *used_bg = NULL; |
6719afdc | 7218 | |
e570fd27 | 7219 | spin_lock(&cluster->refill_lock); |
6719afdc GU |
7220 | while (1) { |
7221 | used_bg = cluster->block_group; | |
7222 | if (!used_bg) | |
7223 | return NULL; | |
7224 | ||
7225 | if (used_bg == block_group) | |
e570fd27 MX |
7226 | return used_bg; |
7227 | ||
6719afdc | 7228 | btrfs_get_block_group(used_bg); |
e570fd27 | 7229 | |
6719afdc GU |
7230 | if (!delalloc) |
7231 | return used_bg; | |
e570fd27 | 7232 | |
6719afdc GU |
7233 | if (down_read_trylock(&used_bg->data_rwsem)) |
7234 | return used_bg; | |
e570fd27 | 7235 | |
6719afdc | 7236 | spin_unlock(&cluster->refill_lock); |
e570fd27 | 7237 | |
e321f8a8 LB |
7238 | /* We should only have one-level nested. */ |
7239 | down_read_nested(&used_bg->data_rwsem, SINGLE_DEPTH_NESTING); | |
e570fd27 | 7240 | |
6719afdc GU |
7241 | spin_lock(&cluster->refill_lock); |
7242 | if (used_bg == cluster->block_group) | |
7243 | return used_bg; | |
e570fd27 | 7244 | |
6719afdc GU |
7245 | up_read(&used_bg->data_rwsem); |
7246 | btrfs_put_block_group(used_bg); | |
7247 | } | |
e570fd27 MX |
7248 | } |
7249 | ||
7250 | static inline void | |
7251 | btrfs_release_block_group(struct btrfs_block_group_cache *cache, | |
7252 | int delalloc) | |
7253 | { | |
7254 | if (delalloc) | |
7255 | up_read(&cache->data_rwsem); | |
7256 | btrfs_put_block_group(cache); | |
7257 | } | |
7258 | ||
b4bd745d QW |
7259 | /* |
7260 | * Structure used internally for find_free_extent() function. Wraps needed | |
7261 | * parameters. | |
7262 | */ | |
7263 | struct find_free_extent_ctl { | |
7264 | /* Basic allocation info */ | |
7265 | u64 ram_bytes; | |
7266 | u64 num_bytes; | |
7267 | u64 empty_size; | |
7268 | u64 flags; | |
7269 | int delalloc; | |
7270 | ||
7271 | /* Where to start the search inside the bg */ | |
7272 | u64 search_start; | |
7273 | ||
7274 | /* For clustered allocation */ | |
7275 | u64 empty_cluster; | |
7276 | ||
7277 | bool have_caching_bg; | |
7278 | bool orig_have_caching_bg; | |
7279 | ||
7280 | /* RAID index, converted from flags */ | |
7281 | int index; | |
7282 | ||
e72d79d6 QW |
7283 | /* |
7284 | * Current loop number, check find_free_extent_update_loop() for details | |
7285 | */ | |
b4bd745d QW |
7286 | int loop; |
7287 | ||
7288 | /* | |
7289 | * Whether we're refilling a cluster, if true we need to re-search | |
7290 | * current block group but don't try to refill the cluster again. | |
7291 | */ | |
7292 | bool retry_clustered; | |
7293 | ||
7294 | /* | |
7295 | * Whether we're updating free space cache, if true we need to re-search | |
7296 | * current block group but don't try updating free space cache again. | |
7297 | */ | |
7298 | bool retry_unclustered; | |
7299 | ||
7300 | /* If current block group is cached */ | |
7301 | int cached; | |
7302 | ||
7303 | /* Max contiguous hole found */ | |
7304 | u64 max_extent_size; | |
7305 | ||
7306 | /* Total free space from free space cache, not always contiguous */ | |
7307 | u64 total_free_space; | |
7308 | ||
7309 | /* Found result */ | |
7310 | u64 found_offset; | |
7311 | }; | |
7312 | ||
d06e3bb6 QW |
7313 | |
7314 | /* | |
7315 | * Helper function for find_free_extent(). | |
7316 | * | |
7317 | * Return -ENOENT to inform caller that we need fallback to unclustered mode. | |
7318 | * Return -EAGAIN to inform caller that we need to re-search this block group | |
7319 | * Return >0 to inform caller that we find nothing | |
7320 | * Return 0 means we have found a location and set ffe_ctl->found_offset. | |
7321 | */ | |
7322 | static int find_free_extent_clustered(struct btrfs_block_group_cache *bg, | |
7323 | struct btrfs_free_cluster *last_ptr, | |
7324 | struct find_free_extent_ctl *ffe_ctl, | |
7325 | struct btrfs_block_group_cache **cluster_bg_ret) | |
7326 | { | |
7327 | struct btrfs_fs_info *fs_info = bg->fs_info; | |
7328 | struct btrfs_block_group_cache *cluster_bg; | |
7329 | u64 aligned_cluster; | |
7330 | u64 offset; | |
7331 | int ret; | |
7332 | ||
7333 | cluster_bg = btrfs_lock_cluster(bg, last_ptr, ffe_ctl->delalloc); | |
7334 | if (!cluster_bg) | |
7335 | goto refill_cluster; | |
7336 | if (cluster_bg != bg && (cluster_bg->ro || | |
7337 | !block_group_bits(cluster_bg, ffe_ctl->flags))) | |
7338 | goto release_cluster; | |
7339 | ||
7340 | offset = btrfs_alloc_from_cluster(cluster_bg, last_ptr, | |
7341 | ffe_ctl->num_bytes, cluster_bg->key.objectid, | |
7342 | &ffe_ctl->max_extent_size); | |
7343 | if (offset) { | |
7344 | /* We have a block, we're done */ | |
7345 | spin_unlock(&last_ptr->refill_lock); | |
7346 | trace_btrfs_reserve_extent_cluster(cluster_bg, | |
7347 | ffe_ctl->search_start, ffe_ctl->num_bytes); | |
7348 | *cluster_bg_ret = cluster_bg; | |
7349 | ffe_ctl->found_offset = offset; | |
7350 | return 0; | |
7351 | } | |
7352 | WARN_ON(last_ptr->block_group != cluster_bg); | |
7353 | ||
7354 | release_cluster: | |
7355 | /* | |
7356 | * If we are on LOOP_NO_EMPTY_SIZE, we can't set up a new clusters, so | |
7357 | * lets just skip it and let the allocator find whatever block it can | |
7358 | * find. If we reach this point, we will have tried the cluster | |
7359 | * allocator plenty of times and not have found anything, so we are | |
7360 | * likely way too fragmented for the clustering stuff to find anything. | |
7361 | * | |
7362 | * However, if the cluster is taken from the current block group, | |
7363 | * release the cluster first, so that we stand a better chance of | |
7364 | * succeeding in the unclustered allocation. | |
7365 | */ | |
7366 | if (ffe_ctl->loop >= LOOP_NO_EMPTY_SIZE && cluster_bg != bg) { | |
7367 | spin_unlock(&last_ptr->refill_lock); | |
7368 | btrfs_release_block_group(cluster_bg, ffe_ctl->delalloc); | |
7369 | return -ENOENT; | |
7370 | } | |
7371 | ||
7372 | /* This cluster didn't work out, free it and start over */ | |
7373 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
7374 | ||
7375 | if (cluster_bg != bg) | |
7376 | btrfs_release_block_group(cluster_bg, ffe_ctl->delalloc); | |
7377 | ||
7378 | refill_cluster: | |
7379 | if (ffe_ctl->loop >= LOOP_NO_EMPTY_SIZE) { | |
7380 | spin_unlock(&last_ptr->refill_lock); | |
7381 | return -ENOENT; | |
7382 | } | |
7383 | ||
7384 | aligned_cluster = max_t(u64, | |
7385 | ffe_ctl->empty_cluster + ffe_ctl->empty_size, | |
7386 | bg->full_stripe_len); | |
7387 | ret = btrfs_find_space_cluster(fs_info, bg, last_ptr, | |
7388 | ffe_ctl->search_start, ffe_ctl->num_bytes, | |
7389 | aligned_cluster); | |
7390 | if (ret == 0) { | |
7391 | /* Now pull our allocation out of this cluster */ | |
7392 | offset = btrfs_alloc_from_cluster(bg, last_ptr, | |
7393 | ffe_ctl->num_bytes, ffe_ctl->search_start, | |
7394 | &ffe_ctl->max_extent_size); | |
7395 | if (offset) { | |
7396 | /* We found one, proceed */ | |
7397 | spin_unlock(&last_ptr->refill_lock); | |
7398 | trace_btrfs_reserve_extent_cluster(bg, | |
7399 | ffe_ctl->search_start, | |
7400 | ffe_ctl->num_bytes); | |
7401 | ffe_ctl->found_offset = offset; | |
7402 | return 0; | |
7403 | } | |
7404 | } else if (!ffe_ctl->cached && ffe_ctl->loop > LOOP_CACHING_NOWAIT && | |
7405 | !ffe_ctl->retry_clustered) { | |
7406 | spin_unlock(&last_ptr->refill_lock); | |
7407 | ||
7408 | ffe_ctl->retry_clustered = true; | |
7409 | wait_block_group_cache_progress(bg, ffe_ctl->num_bytes + | |
7410 | ffe_ctl->empty_cluster + ffe_ctl->empty_size); | |
7411 | return -EAGAIN; | |
7412 | } | |
7413 | /* | |
7414 | * At this point we either didn't find a cluster or we weren't able to | |
7415 | * allocate a block from our cluster. Free the cluster we've been | |
7416 | * trying to use, and go to the next block group. | |
7417 | */ | |
7418 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
7419 | spin_unlock(&last_ptr->refill_lock); | |
7420 | return 1; | |
7421 | } | |
7422 | ||
e1a41848 QW |
7423 | /* |
7424 | * Return >0 to inform caller that we find nothing | |
7425 | * Return 0 when we found an free extent and set ffe_ctrl->found_offset | |
7426 | * Return -EAGAIN to inform caller that we need to re-search this block group | |
7427 | */ | |
7428 | static int find_free_extent_unclustered(struct btrfs_block_group_cache *bg, | |
7429 | struct btrfs_free_cluster *last_ptr, | |
7430 | struct find_free_extent_ctl *ffe_ctl) | |
7431 | { | |
7432 | u64 offset; | |
7433 | ||
7434 | /* | |
7435 | * We are doing an unclustered allocation, set the fragmented flag so | |
7436 | * we don't bother trying to setup a cluster again until we get more | |
7437 | * space. | |
7438 | */ | |
7439 | if (unlikely(last_ptr)) { | |
7440 | spin_lock(&last_ptr->lock); | |
7441 | last_ptr->fragmented = 1; | |
7442 | spin_unlock(&last_ptr->lock); | |
7443 | } | |
7444 | if (ffe_ctl->cached) { | |
7445 | struct btrfs_free_space_ctl *free_space_ctl; | |
7446 | ||
7447 | free_space_ctl = bg->free_space_ctl; | |
7448 | spin_lock(&free_space_ctl->tree_lock); | |
7449 | if (free_space_ctl->free_space < | |
7450 | ffe_ctl->num_bytes + ffe_ctl->empty_cluster + | |
7451 | ffe_ctl->empty_size) { | |
7452 | ffe_ctl->total_free_space = max_t(u64, | |
7453 | ffe_ctl->total_free_space, | |
7454 | free_space_ctl->free_space); | |
7455 | spin_unlock(&free_space_ctl->tree_lock); | |
7456 | return 1; | |
7457 | } | |
7458 | spin_unlock(&free_space_ctl->tree_lock); | |
7459 | } | |
7460 | ||
7461 | offset = btrfs_find_space_for_alloc(bg, ffe_ctl->search_start, | |
7462 | ffe_ctl->num_bytes, ffe_ctl->empty_size, | |
7463 | &ffe_ctl->max_extent_size); | |
7464 | ||
7465 | /* | |
7466 | * If we didn't find a chunk, and we haven't failed on this block group | |
7467 | * before, and this block group is in the middle of caching and we are | |
7468 | * ok with waiting, then go ahead and wait for progress to be made, and | |
7469 | * set @retry_unclustered to true. | |
7470 | * | |
7471 | * If @retry_unclustered is true then we've already waited on this | |
7472 | * block group once and should move on to the next block group. | |
7473 | */ | |
7474 | if (!offset && !ffe_ctl->retry_unclustered && !ffe_ctl->cached && | |
7475 | ffe_ctl->loop > LOOP_CACHING_NOWAIT) { | |
7476 | wait_block_group_cache_progress(bg, ffe_ctl->num_bytes + | |
7477 | ffe_ctl->empty_size); | |
7478 | ffe_ctl->retry_unclustered = true; | |
7479 | return -EAGAIN; | |
7480 | } else if (!offset) { | |
7481 | return 1; | |
7482 | } | |
7483 | ffe_ctl->found_offset = offset; | |
7484 | return 0; | |
7485 | } | |
7486 | ||
e72d79d6 QW |
7487 | /* |
7488 | * Return >0 means caller needs to re-search for free extent | |
7489 | * Return 0 means we have the needed free extent. | |
7490 | * Return <0 means we failed to locate any free extent. | |
7491 | */ | |
7492 | static int find_free_extent_update_loop(struct btrfs_fs_info *fs_info, | |
7493 | struct btrfs_free_cluster *last_ptr, | |
7494 | struct btrfs_key *ins, | |
7495 | struct find_free_extent_ctl *ffe_ctl, | |
7496 | int full_search, bool use_cluster) | |
7497 | { | |
7498 | struct btrfs_root *root = fs_info->extent_root; | |
7499 | int ret; | |
7500 | ||
7501 | if ((ffe_ctl->loop == LOOP_CACHING_NOWAIT) && | |
7502 | ffe_ctl->have_caching_bg && !ffe_ctl->orig_have_caching_bg) | |
7503 | ffe_ctl->orig_have_caching_bg = true; | |
7504 | ||
7505 | if (!ins->objectid && ffe_ctl->loop >= LOOP_CACHING_WAIT && | |
7506 | ffe_ctl->have_caching_bg) | |
7507 | return 1; | |
7508 | ||
7509 | if (!ins->objectid && ++(ffe_ctl->index) < BTRFS_NR_RAID_TYPES) | |
7510 | return 1; | |
7511 | ||
7512 | if (ins->objectid) { | |
7513 | if (!use_cluster && last_ptr) { | |
7514 | spin_lock(&last_ptr->lock); | |
7515 | last_ptr->window_start = ins->objectid; | |
7516 | spin_unlock(&last_ptr->lock); | |
7517 | } | |
7518 | return 0; | |
7519 | } | |
7520 | ||
7521 | /* | |
7522 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
7523 | * caching kthreads as we move along | |
7524 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching | |
7525 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
7526 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
7527 | * again | |
7528 | */ | |
7529 | if (ffe_ctl->loop < LOOP_NO_EMPTY_SIZE) { | |
7530 | ffe_ctl->index = 0; | |
7531 | if (ffe_ctl->loop == LOOP_CACHING_NOWAIT) { | |
7532 | /* | |
7533 | * We want to skip the LOOP_CACHING_WAIT step if we | |
7534 | * don't have any uncached bgs and we've already done a | |
7535 | * full search through. | |
7536 | */ | |
7537 | if (ffe_ctl->orig_have_caching_bg || !full_search) | |
7538 | ffe_ctl->loop = LOOP_CACHING_WAIT; | |
7539 | else | |
7540 | ffe_ctl->loop = LOOP_ALLOC_CHUNK; | |
7541 | } else { | |
7542 | ffe_ctl->loop++; | |
7543 | } | |
7544 | ||
7545 | if (ffe_ctl->loop == LOOP_ALLOC_CHUNK) { | |
7546 | struct btrfs_trans_handle *trans; | |
7547 | int exist = 0; | |
7548 | ||
7549 | trans = current->journal_info; | |
7550 | if (trans) | |
7551 | exist = 1; | |
7552 | else | |
7553 | trans = btrfs_join_transaction(root); | |
7554 | ||
7555 | if (IS_ERR(trans)) { | |
7556 | ret = PTR_ERR(trans); | |
7557 | return ret; | |
7558 | } | |
7559 | ||
7560 | ret = do_chunk_alloc(trans, ffe_ctl->flags, | |
7561 | CHUNK_ALLOC_FORCE); | |
7562 | ||
7563 | /* | |
7564 | * If we can't allocate a new chunk we've already looped | |
7565 | * through at least once, move on to the NO_EMPTY_SIZE | |
7566 | * case. | |
7567 | */ | |
7568 | if (ret == -ENOSPC) | |
7569 | ffe_ctl->loop = LOOP_NO_EMPTY_SIZE; | |
7570 | ||
7571 | /* Do not bail out on ENOSPC since we can do more. */ | |
7572 | if (ret < 0 && ret != -ENOSPC) | |
7573 | btrfs_abort_transaction(trans, ret); | |
7574 | else | |
7575 | ret = 0; | |
7576 | if (!exist) | |
7577 | btrfs_end_transaction(trans); | |
7578 | if (ret) | |
7579 | return ret; | |
7580 | } | |
7581 | ||
7582 | if (ffe_ctl->loop == LOOP_NO_EMPTY_SIZE) { | |
7583 | /* | |
7584 | * Don't loop again if we already have no empty_size and | |
7585 | * no empty_cluster. | |
7586 | */ | |
7587 | if (ffe_ctl->empty_size == 0 && | |
7588 | ffe_ctl->empty_cluster == 0) | |
7589 | return -ENOSPC; | |
7590 | ffe_ctl->empty_size = 0; | |
7591 | ffe_ctl->empty_cluster = 0; | |
7592 | } | |
7593 | return 1; | |
7594 | } | |
7595 | return -ENOSPC; | |
7596 | } | |
7597 | ||
fec577fb CM |
7598 | /* |
7599 | * walks the btree of allocated extents and find a hole of a given size. | |
7600 | * The key ins is changed to record the hole: | |
a4820398 | 7601 | * ins->objectid == start position |
62e2749e | 7602 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
a4820398 | 7603 | * ins->offset == the size of the hole. |
fec577fb | 7604 | * Any available blocks before search_start are skipped. |
a4820398 MX |
7605 | * |
7606 | * If there is no suitable free space, we will record the max size of | |
7607 | * the free space extent currently. | |
e72d79d6 QW |
7608 | * |
7609 | * The overall logic and call chain: | |
7610 | * | |
7611 | * find_free_extent() | |
7612 | * |- Iterate through all block groups | |
7613 | * | |- Get a valid block group | |
7614 | * | |- Try to do clustered allocation in that block group | |
7615 | * | |- Try to do unclustered allocation in that block group | |
7616 | * | |- Check if the result is valid | |
7617 | * | | |- If valid, then exit | |
7618 | * | |- Jump to next block group | |
7619 | * | | |
7620 | * |- Push harder to find free extents | |
7621 | * |- If not found, re-iterate all block groups | |
fec577fb | 7622 | */ |
87bde3cd | 7623 | static noinline int find_free_extent(struct btrfs_fs_info *fs_info, |
18513091 WX |
7624 | u64 ram_bytes, u64 num_bytes, u64 empty_size, |
7625 | u64 hint_byte, struct btrfs_key *ins, | |
7626 | u64 flags, int delalloc) | |
fec577fb | 7627 | { |
80eb234a | 7628 | int ret = 0; |
fa9c0d79 | 7629 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 7630 | struct btrfs_block_group_cache *block_group = NULL; |
b4bd745d | 7631 | struct find_free_extent_ctl ffe_ctl = {0}; |
80eb234a | 7632 | struct btrfs_space_info *space_info; |
67377734 | 7633 | bool use_cluster = true; |
a5e681d9 | 7634 | bool full_search = false; |
fec577fb | 7635 | |
0b246afa | 7636 | WARN_ON(num_bytes < fs_info->sectorsize); |
b4bd745d QW |
7637 | |
7638 | ffe_ctl.ram_bytes = ram_bytes; | |
7639 | ffe_ctl.num_bytes = num_bytes; | |
7640 | ffe_ctl.empty_size = empty_size; | |
7641 | ffe_ctl.flags = flags; | |
7642 | ffe_ctl.search_start = 0; | |
7643 | ffe_ctl.retry_clustered = false; | |
7644 | ffe_ctl.retry_unclustered = false; | |
7645 | ffe_ctl.delalloc = delalloc; | |
7646 | ffe_ctl.index = btrfs_bg_flags_to_raid_index(flags); | |
7647 | ffe_ctl.have_caching_bg = false; | |
7648 | ffe_ctl.orig_have_caching_bg = false; | |
7649 | ffe_ctl.found_offset = 0; | |
7650 | ||
962a298f | 7651 | ins->type = BTRFS_EXTENT_ITEM_KEY; |
80eb234a JB |
7652 | ins->objectid = 0; |
7653 | ins->offset = 0; | |
b1a4d965 | 7654 | |
71ff6437 | 7655 | trace_find_free_extent(fs_info, num_bytes, empty_size, flags); |
3f7de037 | 7656 | |
0b246afa | 7657 | space_info = __find_space_info(fs_info, flags); |
1b1d1f66 | 7658 | if (!space_info) { |
0b246afa | 7659 | btrfs_err(fs_info, "No space info for %llu", flags); |
1b1d1f66 JB |
7660 | return -ENOSPC; |
7661 | } | |
2552d17e | 7662 | |
67377734 | 7663 | /* |
4f4db217 JB |
7664 | * If our free space is heavily fragmented we may not be able to make |
7665 | * big contiguous allocations, so instead of doing the expensive search | |
7666 | * for free space, simply return ENOSPC with our max_extent_size so we | |
7667 | * can go ahead and search for a more manageable chunk. | |
7668 | * | |
7669 | * If our max_extent_size is large enough for our allocation simply | |
7670 | * disable clustering since we will likely not be able to find enough | |
7671 | * space to create a cluster and induce latency trying. | |
67377734 | 7672 | */ |
4f4db217 JB |
7673 | if (unlikely(space_info->max_extent_size)) { |
7674 | spin_lock(&space_info->lock); | |
7675 | if (space_info->max_extent_size && | |
7676 | num_bytes > space_info->max_extent_size) { | |
7677 | ins->offset = space_info->max_extent_size; | |
7678 | spin_unlock(&space_info->lock); | |
7679 | return -ENOSPC; | |
7680 | } else if (space_info->max_extent_size) { | |
7681 | use_cluster = false; | |
7682 | } | |
7683 | spin_unlock(&space_info->lock); | |
fa9c0d79 | 7684 | } |
0f9dd46c | 7685 | |
b4bd745d QW |
7686 | last_ptr = fetch_cluster_info(fs_info, space_info, |
7687 | &ffe_ctl.empty_cluster); | |
239b14b3 | 7688 | if (last_ptr) { |
fa9c0d79 CM |
7689 | spin_lock(&last_ptr->lock); |
7690 | if (last_ptr->block_group) | |
7691 | hint_byte = last_ptr->window_start; | |
c759c4e1 JB |
7692 | if (last_ptr->fragmented) { |
7693 | /* | |
7694 | * We still set window_start so we can keep track of the | |
7695 | * last place we found an allocation to try and save | |
7696 | * some time. | |
7697 | */ | |
7698 | hint_byte = last_ptr->window_start; | |
7699 | use_cluster = false; | |
7700 | } | |
fa9c0d79 | 7701 | spin_unlock(&last_ptr->lock); |
239b14b3 | 7702 | } |
fa9c0d79 | 7703 | |
b4bd745d QW |
7704 | ffe_ctl.search_start = max(ffe_ctl.search_start, |
7705 | first_logical_byte(fs_info, 0)); | |
7706 | ffe_ctl.search_start = max(ffe_ctl.search_start, hint_byte); | |
7707 | if (ffe_ctl.search_start == hint_byte) { | |
7708 | block_group = btrfs_lookup_block_group(fs_info, | |
7709 | ffe_ctl.search_start); | |
817d52f8 JB |
7710 | /* |
7711 | * we don't want to use the block group if it doesn't match our | |
7712 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
7713 | * |
7714 | * However if we are re-searching with an ideal block group | |
7715 | * picked out then we don't care that the block group is cached. | |
817d52f8 | 7716 | */ |
b6919a58 | 7717 | if (block_group && block_group_bits(block_group, flags) && |
285ff5af | 7718 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 7719 | down_read(&space_info->groups_sem); |
44fb5511 CM |
7720 | if (list_empty(&block_group->list) || |
7721 | block_group->ro) { | |
7722 | /* | |
7723 | * someone is removing this block group, | |
7724 | * we can't jump into the have_block_group | |
7725 | * target because our list pointers are not | |
7726 | * valid | |
7727 | */ | |
7728 | btrfs_put_block_group(block_group); | |
7729 | up_read(&space_info->groups_sem); | |
ccf0e725 | 7730 | } else { |
b4bd745d | 7731 | ffe_ctl.index = btrfs_bg_flags_to_raid_index( |
3e72ee88 | 7732 | block_group->flags); |
e570fd27 | 7733 | btrfs_lock_block_group(block_group, delalloc); |
44fb5511 | 7734 | goto have_block_group; |
ccf0e725 | 7735 | } |
2552d17e | 7736 | } else if (block_group) { |
fa9c0d79 | 7737 | btrfs_put_block_group(block_group); |
2552d17e | 7738 | } |
42e70e7a | 7739 | } |
2552d17e | 7740 | search: |
b4bd745d QW |
7741 | ffe_ctl.have_caching_bg = false; |
7742 | if (ffe_ctl.index == btrfs_bg_flags_to_raid_index(flags) || | |
7743 | ffe_ctl.index == 0) | |
a5e681d9 | 7744 | full_search = true; |
80eb234a | 7745 | down_read(&space_info->groups_sem); |
b4bd745d QW |
7746 | list_for_each_entry(block_group, |
7747 | &space_info->block_groups[ffe_ctl.index], list) { | |
14443937 JM |
7748 | /* If the block group is read-only, we can skip it entirely. */ |
7749 | if (unlikely(block_group->ro)) | |
7750 | continue; | |
7751 | ||
e570fd27 | 7752 | btrfs_grab_block_group(block_group, delalloc); |
b4bd745d | 7753 | ffe_ctl.search_start = block_group->key.objectid; |
42e70e7a | 7754 | |
83a50de9 CM |
7755 | /* |
7756 | * this can happen if we end up cycling through all the | |
7757 | * raid types, but we want to make sure we only allocate | |
7758 | * for the proper type. | |
7759 | */ | |
b6919a58 | 7760 | if (!block_group_bits(block_group, flags)) { |
bece2e82 | 7761 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
83a50de9 | 7762 | BTRFS_BLOCK_GROUP_RAID1 | |
53b381b3 DW |
7763 | BTRFS_BLOCK_GROUP_RAID5 | |
7764 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
7765 | BTRFS_BLOCK_GROUP_RAID10; |
7766 | ||
7767 | /* | |
7768 | * if they asked for extra copies and this block group | |
7769 | * doesn't provide them, bail. This does allow us to | |
7770 | * fill raid0 from raid1. | |
7771 | */ | |
b6919a58 | 7772 | if ((flags & extra) && !(block_group->flags & extra)) |
83a50de9 CM |
7773 | goto loop; |
7774 | } | |
7775 | ||
2552d17e | 7776 | have_block_group: |
b4bd745d QW |
7777 | ffe_ctl.cached = block_group_cache_done(block_group); |
7778 | if (unlikely(!ffe_ctl.cached)) { | |
7779 | ffe_ctl.have_caching_bg = true; | |
f6373bf3 | 7780 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
7781 | BUG_ON(ret < 0); |
7782 | ret = 0; | |
817d52f8 JB |
7783 | } |
7784 | ||
36cce922 JB |
7785 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
7786 | goto loop; | |
0f9dd46c | 7787 | |
0a24325e | 7788 | /* |
062c05c4 AO |
7789 | * Ok we want to try and use the cluster allocator, so |
7790 | * lets look there | |
0a24325e | 7791 | */ |
c759c4e1 | 7792 | if (last_ptr && use_cluster) { |
d06e3bb6 | 7793 | struct btrfs_block_group_cache *cluster_bg = NULL; |
fa9c0d79 | 7794 | |
d06e3bb6 QW |
7795 | ret = find_free_extent_clustered(block_group, last_ptr, |
7796 | &ffe_ctl, &cluster_bg); | |
062c05c4 | 7797 | |
fa9c0d79 | 7798 | if (ret == 0) { |
d06e3bb6 QW |
7799 | if (cluster_bg && cluster_bg != block_group) { |
7800 | btrfs_release_block_group(block_group, | |
7801 | delalloc); | |
7802 | block_group = cluster_bg; | |
fa9c0d79 | 7803 | } |
d06e3bb6 QW |
7804 | goto checks; |
7805 | } else if (ret == -EAGAIN) { | |
817d52f8 | 7806 | goto have_block_group; |
d06e3bb6 QW |
7807 | } else if (ret > 0) { |
7808 | goto loop; | |
fa9c0d79 | 7809 | } |
d06e3bb6 | 7810 | /* ret == -ENOENT case falls through */ |
fa9c0d79 CM |
7811 | } |
7812 | ||
e1a41848 QW |
7813 | ret = find_free_extent_unclustered(block_group, last_ptr, |
7814 | &ffe_ctl); | |
7815 | if (ret == -EAGAIN) | |
817d52f8 | 7816 | goto have_block_group; |
e1a41848 | 7817 | else if (ret > 0) |
1cdda9b8 | 7818 | goto loop; |
e1a41848 | 7819 | /* ret == 0 case falls through */ |
fa9c0d79 | 7820 | checks: |
b4bd745d QW |
7821 | ffe_ctl.search_start = round_up(ffe_ctl.found_offset, |
7822 | fs_info->stripesize); | |
25179201 | 7823 | |
2552d17e | 7824 | /* move on to the next group */ |
b4bd745d | 7825 | if (ffe_ctl.search_start + num_bytes > |
215a63d1 | 7826 | block_group->key.objectid + block_group->key.offset) { |
b4bd745d QW |
7827 | btrfs_add_free_space(block_group, ffe_ctl.found_offset, |
7828 | num_bytes); | |
2552d17e | 7829 | goto loop; |
6226cb0a | 7830 | } |
f5a31e16 | 7831 | |
b4bd745d QW |
7832 | if (ffe_ctl.found_offset < ffe_ctl.search_start) |
7833 | btrfs_add_free_space(block_group, ffe_ctl.found_offset, | |
7834 | ffe_ctl.search_start - ffe_ctl.found_offset); | |
2552d17e | 7835 | |
18513091 WX |
7836 | ret = btrfs_add_reserved_bytes(block_group, ram_bytes, |
7837 | num_bytes, delalloc); | |
f0486c68 | 7838 | if (ret == -EAGAIN) { |
b4bd745d QW |
7839 | btrfs_add_free_space(block_group, ffe_ctl.found_offset, |
7840 | num_bytes); | |
2552d17e | 7841 | goto loop; |
0f9dd46c | 7842 | } |
9cfa3e34 | 7843 | btrfs_inc_block_group_reservations(block_group); |
0b86a832 | 7844 | |
f0486c68 | 7845 | /* we are all good, lets return */ |
b4bd745d | 7846 | ins->objectid = ffe_ctl.search_start; |
2552d17e | 7847 | ins->offset = num_bytes; |
d2fb3437 | 7848 | |
b4bd745d QW |
7849 | trace_btrfs_reserve_extent(block_group, ffe_ctl.search_start, |
7850 | num_bytes); | |
e570fd27 | 7851 | btrfs_release_block_group(block_group, delalloc); |
2552d17e JB |
7852 | break; |
7853 | loop: | |
b4bd745d QW |
7854 | ffe_ctl.retry_clustered = false; |
7855 | ffe_ctl.retry_unclustered = false; | |
3e72ee88 | 7856 | BUG_ON(btrfs_bg_flags_to_raid_index(block_group->flags) != |
b4bd745d | 7857 | ffe_ctl.index); |
e570fd27 | 7858 | btrfs_release_block_group(block_group, delalloc); |
14443937 | 7859 | cond_resched(); |
2552d17e JB |
7860 | } |
7861 | up_read(&space_info->groups_sem); | |
7862 | ||
e72d79d6 QW |
7863 | ret = find_free_extent_update_loop(fs_info, last_ptr, ins, &ffe_ctl, |
7864 | full_search, use_cluster); | |
7865 | if (ret > 0) | |
b742bb82 YZ |
7866 | goto search; |
7867 | ||
4f4db217 | 7868 | if (ret == -ENOSPC) { |
b4bd745d QW |
7869 | /* |
7870 | * Use ffe_ctl->total_free_space as fallback if we can't find | |
7871 | * any contiguous hole. | |
7872 | */ | |
7873 | if (!ffe_ctl.max_extent_size) | |
7874 | ffe_ctl.max_extent_size = ffe_ctl.total_free_space; | |
4f4db217 | 7875 | spin_lock(&space_info->lock); |
b4bd745d | 7876 | space_info->max_extent_size = ffe_ctl.max_extent_size; |
4f4db217 | 7877 | spin_unlock(&space_info->lock); |
b4bd745d | 7878 | ins->offset = ffe_ctl.max_extent_size; |
4f4db217 | 7879 | } |
0f70abe2 | 7880 | return ret; |
fec577fb | 7881 | } |
ec44a35c | 7882 | |
ab8d0fc4 JM |
7883 | static void dump_space_info(struct btrfs_fs_info *fs_info, |
7884 | struct btrfs_space_info *info, u64 bytes, | |
9ed74f2d | 7885 | int dump_block_groups) |
0f9dd46c JB |
7886 | { |
7887 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 7888 | int index = 0; |
0f9dd46c | 7889 | |
9ed74f2d | 7890 | spin_lock(&info->lock); |
ab8d0fc4 JM |
7891 | btrfs_info(fs_info, "space_info %llu has %llu free, is %sfull", |
7892 | info->flags, | |
4136135b LB |
7893 | info->total_bytes - btrfs_space_info_used(info, true), |
7894 | info->full ? "" : "not "); | |
ab8d0fc4 JM |
7895 | btrfs_info(fs_info, |
7896 | "space_info total=%llu, used=%llu, pinned=%llu, reserved=%llu, may_use=%llu, readonly=%llu", | |
7897 | info->total_bytes, info->bytes_used, info->bytes_pinned, | |
7898 | info->bytes_reserved, info->bytes_may_use, | |
7899 | info->bytes_readonly); | |
9ed74f2d JB |
7900 | spin_unlock(&info->lock); |
7901 | ||
7902 | if (!dump_block_groups) | |
7903 | return; | |
0f9dd46c | 7904 | |
80eb234a | 7905 | down_read(&info->groups_sem); |
b742bb82 YZ |
7906 | again: |
7907 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 7908 | spin_lock(&cache->lock); |
ab8d0fc4 JM |
7909 | btrfs_info(fs_info, |
7910 | "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s", | |
7911 | cache->key.objectid, cache->key.offset, | |
7912 | btrfs_block_group_used(&cache->item), cache->pinned, | |
7913 | cache->reserved, cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
7914 | btrfs_dump_free_space(cache, bytes); |
7915 | spin_unlock(&cache->lock); | |
7916 | } | |
b742bb82 YZ |
7917 | if (++index < BTRFS_NR_RAID_TYPES) |
7918 | goto again; | |
80eb234a | 7919 | up_read(&info->groups_sem); |
0f9dd46c | 7920 | } |
e8569813 | 7921 | |
6f47c706 NB |
7922 | /* |
7923 | * btrfs_reserve_extent - entry point to the extent allocator. Tries to find a | |
7924 | * hole that is at least as big as @num_bytes. | |
7925 | * | |
7926 | * @root - The root that will contain this extent | |
7927 | * | |
7928 | * @ram_bytes - The amount of space in ram that @num_bytes take. This | |
7929 | * is used for accounting purposes. This value differs | |
7930 | * from @num_bytes only in the case of compressed extents. | |
7931 | * | |
7932 | * @num_bytes - Number of bytes to allocate on-disk. | |
7933 | * | |
7934 | * @min_alloc_size - Indicates the minimum amount of space that the | |
7935 | * allocator should try to satisfy. In some cases | |
7936 | * @num_bytes may be larger than what is required and if | |
7937 | * the filesystem is fragmented then allocation fails. | |
7938 | * However, the presence of @min_alloc_size gives a | |
7939 | * chance to try and satisfy the smaller allocation. | |
7940 | * | |
7941 | * @empty_size - A hint that you plan on doing more COW. This is the | |
7942 | * size in bytes the allocator should try to find free | |
7943 | * next to the block it returns. This is just a hint and | |
7944 | * may be ignored by the allocator. | |
7945 | * | |
7946 | * @hint_byte - Hint to the allocator to start searching above the byte | |
7947 | * address passed. It might be ignored. | |
7948 | * | |
7949 | * @ins - This key is modified to record the found hole. It will | |
7950 | * have the following values: | |
7951 | * ins->objectid == start position | |
7952 | * ins->flags = BTRFS_EXTENT_ITEM_KEY | |
7953 | * ins->offset == the size of the hole. | |
7954 | * | |
7955 | * @is_data - Boolean flag indicating whether an extent is | |
7956 | * allocated for data (true) or metadata (false) | |
7957 | * | |
7958 | * @delalloc - Boolean flag indicating whether this allocation is for | |
7959 | * delalloc or not. If 'true' data_rwsem of block groups | |
7960 | * is going to be acquired. | |
7961 | * | |
7962 | * | |
7963 | * Returns 0 when an allocation succeeded or < 0 when an error occurred. In | |
7964 | * case -ENOSPC is returned then @ins->offset will contain the size of the | |
7965 | * largest available hole the allocator managed to find. | |
7966 | */ | |
18513091 | 7967 | int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, |
11833d66 YZ |
7968 | u64 num_bytes, u64 min_alloc_size, |
7969 | u64 empty_size, u64 hint_byte, | |
e570fd27 | 7970 | struct btrfs_key *ins, int is_data, int delalloc) |
fec577fb | 7971 | { |
ab8d0fc4 | 7972 | struct btrfs_fs_info *fs_info = root->fs_info; |
36af4e07 | 7973 | bool final_tried = num_bytes == min_alloc_size; |
b6919a58 | 7974 | u64 flags; |
fec577fb | 7975 | int ret; |
925baedd | 7976 | |
1b86826d | 7977 | flags = get_alloc_profile_by_root(root, is_data); |
98d20f67 | 7978 | again: |
0b246afa | 7979 | WARN_ON(num_bytes < fs_info->sectorsize); |
87bde3cd | 7980 | ret = find_free_extent(fs_info, ram_bytes, num_bytes, empty_size, |
18513091 | 7981 | hint_byte, ins, flags, delalloc); |
9cfa3e34 | 7982 | if (!ret && !is_data) { |
ab8d0fc4 | 7983 | btrfs_dec_block_group_reservations(fs_info, ins->objectid); |
9cfa3e34 | 7984 | } else if (ret == -ENOSPC) { |
a4820398 MX |
7985 | if (!final_tried && ins->offset) { |
7986 | num_bytes = min(num_bytes >> 1, ins->offset); | |
da17066c | 7987 | num_bytes = round_down(num_bytes, |
0b246afa | 7988 | fs_info->sectorsize); |
9e622d6b | 7989 | num_bytes = max(num_bytes, min_alloc_size); |
18513091 | 7990 | ram_bytes = num_bytes; |
9e622d6b MX |
7991 | if (num_bytes == min_alloc_size) |
7992 | final_tried = true; | |
7993 | goto again; | |
ab8d0fc4 | 7994 | } else if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
9e622d6b MX |
7995 | struct btrfs_space_info *sinfo; |
7996 | ||
ab8d0fc4 | 7997 | sinfo = __find_space_info(fs_info, flags); |
0b246afa | 7998 | btrfs_err(fs_info, |
5d163e0e JM |
7999 | "allocation failed flags %llu, wanted %llu", |
8000 | flags, num_bytes); | |
53804280 | 8001 | if (sinfo) |
ab8d0fc4 | 8002 | dump_space_info(fs_info, sinfo, num_bytes, 1); |
9e622d6b | 8003 | } |
925baedd | 8004 | } |
0f9dd46c JB |
8005 | |
8006 | return ret; | |
e6dcd2dc CM |
8007 | } |
8008 | ||
2ff7e61e | 8009 | static int __btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info, |
e570fd27 MX |
8010 | u64 start, u64 len, |
8011 | int pin, int delalloc) | |
65b51a00 | 8012 | { |
0f9dd46c | 8013 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 8014 | int ret = 0; |
0f9dd46c | 8015 | |
0b246afa | 8016 | cache = btrfs_lookup_block_group(fs_info, start); |
0f9dd46c | 8017 | if (!cache) { |
0b246afa JM |
8018 | btrfs_err(fs_info, "Unable to find block group for %llu", |
8019 | start); | |
0f9dd46c JB |
8020 | return -ENOSPC; |
8021 | } | |
1f3c79a2 | 8022 | |
e688b725 | 8023 | if (pin) |
2ff7e61e | 8024 | pin_down_extent(fs_info, cache, start, len, 1); |
e688b725 | 8025 | else { |
0b246afa | 8026 | if (btrfs_test_opt(fs_info, DISCARD)) |
2ff7e61e | 8027 | ret = btrfs_discard_extent(fs_info, start, len, NULL); |
e688b725 | 8028 | btrfs_add_free_space(cache, start, len); |
4824f1f4 | 8029 | btrfs_free_reserved_bytes(cache, len, delalloc); |
71ff6437 | 8030 | trace_btrfs_reserved_extent_free(fs_info, start, len); |
e688b725 | 8031 | } |
31193213 | 8032 | |
fa9c0d79 | 8033 | btrfs_put_block_group(cache); |
e6dcd2dc CM |
8034 | return ret; |
8035 | } | |
8036 | ||
2ff7e61e | 8037 | int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info, |
e570fd27 | 8038 | u64 start, u64 len, int delalloc) |
e688b725 | 8039 | { |
2ff7e61e | 8040 | return __btrfs_free_reserved_extent(fs_info, start, len, 0, delalloc); |
e688b725 CM |
8041 | } |
8042 | ||
2ff7e61e | 8043 | int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info, |
e688b725 CM |
8044 | u64 start, u64 len) |
8045 | { | |
2ff7e61e | 8046 | return __btrfs_free_reserved_extent(fs_info, start, len, 1, 0); |
e688b725 CM |
8047 | } |
8048 | ||
5d4f98a2 | 8049 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
8050 | u64 parent, u64 root_objectid, |
8051 | u64 flags, u64 owner, u64 offset, | |
8052 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc | 8053 | { |
ef89b824 | 8054 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e6dcd2dc | 8055 | int ret; |
e6dcd2dc | 8056 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 8057 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 8058 | struct btrfs_path *path; |
5d4f98a2 YZ |
8059 | struct extent_buffer *leaf; |
8060 | int type; | |
8061 | u32 size; | |
26b8003f | 8062 | |
5d4f98a2 YZ |
8063 | if (parent > 0) |
8064 | type = BTRFS_SHARED_DATA_REF_KEY; | |
8065 | else | |
8066 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 8067 | |
5d4f98a2 | 8068 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
8069 | |
8070 | path = btrfs_alloc_path(); | |
db5b493a TI |
8071 | if (!path) |
8072 | return -ENOMEM; | |
47e4bb98 | 8073 | |
b9473439 | 8074 | path->leave_spinning = 1; |
5d4f98a2 YZ |
8075 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
8076 | ins, size); | |
79787eaa JM |
8077 | if (ret) { |
8078 | btrfs_free_path(path); | |
8079 | return ret; | |
8080 | } | |
0f9dd46c | 8081 | |
5d4f98a2 YZ |
8082 | leaf = path->nodes[0]; |
8083 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 8084 | struct btrfs_extent_item); |
5d4f98a2 YZ |
8085 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
8086 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
8087 | btrfs_set_extent_flags(leaf, extent_item, | |
8088 | flags | BTRFS_EXTENT_FLAG_DATA); | |
8089 | ||
8090 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
8091 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
8092 | if (parent > 0) { | |
8093 | struct btrfs_shared_data_ref *ref; | |
8094 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
8095 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
8096 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
8097 | } else { | |
8098 | struct btrfs_extent_data_ref *ref; | |
8099 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
8100 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
8101 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
8102 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
8103 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
8104 | } | |
47e4bb98 CM |
8105 | |
8106 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 8107 | btrfs_free_path(path); |
f510cfec | 8108 | |
25a356d3 | 8109 | ret = remove_from_free_space_tree(trans, ins->objectid, ins->offset); |
1e144fb8 OS |
8110 | if (ret) |
8111 | return ret; | |
8112 | ||
6202df69 | 8113 | ret = update_block_group(trans, fs_info, ins->objectid, ins->offset, 1); |
79787eaa | 8114 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 8115 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 8116 | ins->objectid, ins->offset); |
f5947066 CM |
8117 | BUG(); |
8118 | } | |
71ff6437 | 8119 | trace_btrfs_reserved_extent_alloc(fs_info, ins->objectid, ins->offset); |
e6dcd2dc CM |
8120 | return ret; |
8121 | } | |
8122 | ||
5d4f98a2 | 8123 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
4e6bd4e0 | 8124 | struct btrfs_delayed_ref_node *node, |
21ebfbe7 | 8125 | struct btrfs_delayed_extent_op *extent_op) |
e6dcd2dc | 8126 | { |
9dcdbe01 | 8127 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e6dcd2dc | 8128 | int ret; |
5d4f98a2 | 8129 | struct btrfs_extent_item *extent_item; |
4e6bd4e0 | 8130 | struct btrfs_key extent_key; |
5d4f98a2 YZ |
8131 | struct btrfs_tree_block_info *block_info; |
8132 | struct btrfs_extent_inline_ref *iref; | |
8133 | struct btrfs_path *path; | |
8134 | struct extent_buffer *leaf; | |
4e6bd4e0 | 8135 | struct btrfs_delayed_tree_ref *ref; |
3173a18f | 8136 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
4e6bd4e0 | 8137 | u64 num_bytes; |
21ebfbe7 | 8138 | u64 flags = extent_op->flags_to_set; |
0b246afa | 8139 | bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA); |
3173a18f | 8140 | |
4e6bd4e0 NB |
8141 | ref = btrfs_delayed_node_to_tree_ref(node); |
8142 | ||
4e6bd4e0 NB |
8143 | extent_key.objectid = node->bytenr; |
8144 | if (skinny_metadata) { | |
8145 | extent_key.offset = ref->level; | |
8146 | extent_key.type = BTRFS_METADATA_ITEM_KEY; | |
8147 | num_bytes = fs_info->nodesize; | |
8148 | } else { | |
8149 | extent_key.offset = node->num_bytes; | |
8150 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
3173a18f | 8151 | size += sizeof(*block_info); |
4e6bd4e0 NB |
8152 | num_bytes = node->num_bytes; |
8153 | } | |
1c2308f8 | 8154 | |
5d4f98a2 | 8155 | path = btrfs_alloc_path(); |
80ee54bf | 8156 | if (!path) |
d8926bb3 | 8157 | return -ENOMEM; |
56bec294 | 8158 | |
5d4f98a2 YZ |
8159 | path->leave_spinning = 1; |
8160 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
4e6bd4e0 | 8161 | &extent_key, size); |
79787eaa | 8162 | if (ret) { |
dd825259 | 8163 | btrfs_free_path(path); |
79787eaa JM |
8164 | return ret; |
8165 | } | |
5d4f98a2 YZ |
8166 | |
8167 | leaf = path->nodes[0]; | |
8168 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
8169 | struct btrfs_extent_item); | |
8170 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
8171 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
8172 | btrfs_set_extent_flags(leaf, extent_item, | |
8173 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 8174 | |
3173a18f JB |
8175 | if (skinny_metadata) { |
8176 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
8177 | } else { | |
8178 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
21ebfbe7 | 8179 | btrfs_set_tree_block_key(leaf, block_info, &extent_op->key); |
4e6bd4e0 | 8180 | btrfs_set_tree_block_level(leaf, block_info, ref->level); |
3173a18f JB |
8181 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); |
8182 | } | |
5d4f98a2 | 8183 | |
d4b20733 | 8184 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) { |
5d4f98a2 YZ |
8185 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); |
8186 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
8187 | BTRFS_SHARED_BLOCK_REF_KEY); | |
d4b20733 | 8188 | btrfs_set_extent_inline_ref_offset(leaf, iref, ref->parent); |
5d4f98a2 YZ |
8189 | } else { |
8190 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
8191 | BTRFS_TREE_BLOCK_REF_KEY); | |
4e6bd4e0 | 8192 | btrfs_set_extent_inline_ref_offset(leaf, iref, ref->root); |
5d4f98a2 YZ |
8193 | } |
8194 | ||
8195 | btrfs_mark_buffer_dirty(leaf); | |
8196 | btrfs_free_path(path); | |
8197 | ||
4e6bd4e0 NB |
8198 | ret = remove_from_free_space_tree(trans, extent_key.objectid, |
8199 | num_bytes); | |
1e144fb8 OS |
8200 | if (ret) |
8201 | return ret; | |
8202 | ||
4e6bd4e0 | 8203 | ret = update_block_group(trans, fs_info, extent_key.objectid, |
6202df69 | 8204 | fs_info->nodesize, 1); |
79787eaa | 8205 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 8206 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
4e6bd4e0 | 8207 | extent_key.objectid, extent_key.offset); |
5d4f98a2 YZ |
8208 | BUG(); |
8209 | } | |
0be5dc67 | 8210 | |
4e6bd4e0 | 8211 | trace_btrfs_reserved_extent_alloc(fs_info, extent_key.objectid, |
0b246afa | 8212 | fs_info->nodesize); |
5d4f98a2 YZ |
8213 | return ret; |
8214 | } | |
8215 | ||
8216 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
84f7d8e6 | 8217 | struct btrfs_root *root, u64 owner, |
5846a3c2 QW |
8218 | u64 offset, u64 ram_bytes, |
8219 | struct btrfs_key *ins) | |
5d4f98a2 YZ |
8220 | { |
8221 | int ret; | |
8222 | ||
84f7d8e6 | 8223 | BUG_ON(root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID); |
5d4f98a2 | 8224 | |
fd708b81 JB |
8225 | btrfs_ref_tree_mod(root, ins->objectid, ins->offset, 0, |
8226 | root->root_key.objectid, owner, offset, | |
8227 | BTRFS_ADD_DELAYED_EXTENT); | |
8228 | ||
88a979c6 | 8229 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, |
84f7d8e6 JB |
8230 | ins->offset, 0, |
8231 | root->root_key.objectid, owner, | |
7be07912 OS |
8232 | offset, ram_bytes, |
8233 | BTRFS_ADD_DELAYED_EXTENT, NULL, NULL); | |
e6dcd2dc CM |
8234 | return ret; |
8235 | } | |
e02119d5 CM |
8236 | |
8237 | /* | |
8238 | * this is used by the tree logging recovery code. It records that | |
8239 | * an extent has been allocated and makes sure to clear the free | |
8240 | * space cache bits as well | |
8241 | */ | |
5d4f98a2 | 8242 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
8243 | u64 root_objectid, u64 owner, u64 offset, |
8244 | struct btrfs_key *ins) | |
e02119d5 | 8245 | { |
61da2abf | 8246 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e02119d5 CM |
8247 | int ret; |
8248 | struct btrfs_block_group_cache *block_group; | |
ed7a6948 | 8249 | struct btrfs_space_info *space_info; |
11833d66 | 8250 | |
8c2a1a30 JB |
8251 | /* |
8252 | * Mixed block groups will exclude before processing the log so we only | |
01327610 | 8253 | * need to do the exclude dance if this fs isn't mixed. |
8c2a1a30 | 8254 | */ |
0b246afa | 8255 | if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { |
2ff7e61e JM |
8256 | ret = __exclude_logged_extent(fs_info, ins->objectid, |
8257 | ins->offset); | |
b50c6e25 | 8258 | if (ret) |
8c2a1a30 | 8259 | return ret; |
11833d66 YZ |
8260 | } |
8261 | ||
0b246afa | 8262 | block_group = btrfs_lookup_block_group(fs_info, ins->objectid); |
8c2a1a30 JB |
8263 | if (!block_group) |
8264 | return -EINVAL; | |
8265 | ||
ed7a6948 WX |
8266 | space_info = block_group->space_info; |
8267 | spin_lock(&space_info->lock); | |
8268 | spin_lock(&block_group->lock); | |
8269 | space_info->bytes_reserved += ins->offset; | |
8270 | block_group->reserved += ins->offset; | |
8271 | spin_unlock(&block_group->lock); | |
8272 | spin_unlock(&space_info->lock); | |
8273 | ||
ef89b824 NB |
8274 | ret = alloc_reserved_file_extent(trans, 0, root_objectid, 0, owner, |
8275 | offset, ins, 1); | |
b50c6e25 | 8276 | btrfs_put_block_group(block_group); |
e02119d5 CM |
8277 | return ret; |
8278 | } | |
8279 | ||
48a3b636 ES |
8280 | static struct extent_buffer * |
8281 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
bc877d28 | 8282 | u64 bytenr, int level, u64 owner) |
65b51a00 | 8283 | { |
0b246afa | 8284 | struct btrfs_fs_info *fs_info = root->fs_info; |
65b51a00 CM |
8285 | struct extent_buffer *buf; |
8286 | ||
2ff7e61e | 8287 | buf = btrfs_find_create_tree_block(fs_info, bytenr); |
c871b0f2 LB |
8288 | if (IS_ERR(buf)) |
8289 | return buf; | |
8290 | ||
b72c3aba QW |
8291 | /* |
8292 | * Extra safety check in case the extent tree is corrupted and extent | |
8293 | * allocator chooses to use a tree block which is already used and | |
8294 | * locked. | |
8295 | */ | |
8296 | if (buf->lock_owner == current->pid) { | |
8297 | btrfs_err_rl(fs_info, | |
8298 | "tree block %llu owner %llu already locked by pid=%d, extent tree corruption detected", | |
8299 | buf->start, btrfs_header_owner(buf), current->pid); | |
8300 | free_extent_buffer(buf); | |
8301 | return ERR_PTR(-EUCLEAN); | |
8302 | } | |
8303 | ||
85d4e461 | 8304 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 | 8305 | btrfs_tree_lock(buf); |
7c302b49 | 8306 | clean_tree_block(fs_info, buf); |
3083ee2e | 8307 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
8308 | |
8309 | btrfs_set_lock_blocking(buf); | |
4db8c528 | 8310 | set_extent_buffer_uptodate(buf); |
b4ce94de | 8311 | |
bc877d28 NB |
8312 | memzero_extent_buffer(buf, 0, sizeof(struct btrfs_header)); |
8313 | btrfs_set_header_level(buf, level); | |
8314 | btrfs_set_header_bytenr(buf, buf->start); | |
8315 | btrfs_set_header_generation(buf, trans->transid); | |
8316 | btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV); | |
8317 | btrfs_set_header_owner(buf, owner); | |
de37aa51 | 8318 | write_extent_buffer_fsid(buf, fs_info->fs_devices->metadata_uuid); |
bc877d28 | 8319 | write_extent_buffer_chunk_tree_uuid(buf, fs_info->chunk_tree_uuid); |
d0c803c4 | 8320 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
656f30db | 8321 | buf->log_index = root->log_transid % 2; |
8cef4e16 YZ |
8322 | /* |
8323 | * we allow two log transactions at a time, use different | |
8324 | * EXENT bit to differentiate dirty pages. | |
8325 | */ | |
656f30db | 8326 | if (buf->log_index == 0) |
8cef4e16 YZ |
8327 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
8328 | buf->start + buf->len - 1, GFP_NOFS); | |
8329 | else | |
8330 | set_extent_new(&root->dirty_log_pages, buf->start, | |
3744dbeb | 8331 | buf->start + buf->len - 1); |
d0c803c4 | 8332 | } else { |
656f30db | 8333 | buf->log_index = -1; |
d0c803c4 | 8334 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
65b51a00 | 8335 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 8336 | } |
64c12921 | 8337 | trans->dirty = true; |
b4ce94de | 8338 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
8339 | return buf; |
8340 | } | |
8341 | ||
f0486c68 YZ |
8342 | static struct btrfs_block_rsv * |
8343 | use_block_rsv(struct btrfs_trans_handle *trans, | |
8344 | struct btrfs_root *root, u32 blocksize) | |
8345 | { | |
0b246afa | 8346 | struct btrfs_fs_info *fs_info = root->fs_info; |
f0486c68 | 8347 | struct btrfs_block_rsv *block_rsv; |
0b246afa | 8348 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
f0486c68 | 8349 | int ret; |
d88033db | 8350 | bool global_updated = false; |
f0486c68 YZ |
8351 | |
8352 | block_rsv = get_block_rsv(trans, root); | |
8353 | ||
b586b323 MX |
8354 | if (unlikely(block_rsv->size == 0)) |
8355 | goto try_reserve; | |
d88033db | 8356 | again: |
f0486c68 YZ |
8357 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
8358 | if (!ret) | |
8359 | return block_rsv; | |
8360 | ||
b586b323 MX |
8361 | if (block_rsv->failfast) |
8362 | return ERR_PTR(ret); | |
8363 | ||
d88033db MX |
8364 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
8365 | global_updated = true; | |
0b246afa | 8366 | update_global_block_rsv(fs_info); |
d88033db MX |
8367 | goto again; |
8368 | } | |
8369 | ||
0b246afa | 8370 | if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
b586b323 MX |
8371 | static DEFINE_RATELIMIT_STATE(_rs, |
8372 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
8373 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
8374 | if (__ratelimit(&_rs)) | |
8375 | WARN(1, KERN_DEBUG | |
efe120a0 | 8376 | "BTRFS: block rsv returned %d\n", ret); |
b586b323 MX |
8377 | } |
8378 | try_reserve: | |
8379 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
8380 | BTRFS_RESERVE_NO_FLUSH); | |
8381 | if (!ret) | |
8382 | return block_rsv; | |
8383 | /* | |
8384 | * If we couldn't reserve metadata bytes try and use some from | |
5881cfc9 MX |
8385 | * the global reserve if its space type is the same as the global |
8386 | * reservation. | |
b586b323 | 8387 | */ |
5881cfc9 MX |
8388 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
8389 | block_rsv->space_info == global_rsv->space_info) { | |
b586b323 MX |
8390 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
8391 | if (!ret) | |
8392 | return global_rsv; | |
8393 | } | |
8394 | return ERR_PTR(ret); | |
f0486c68 YZ |
8395 | } |
8396 | ||
8c2a3ca2 JB |
8397 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
8398 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 | 8399 | { |
3a584174 | 8400 | block_rsv_add_bytes(block_rsv, blocksize, false); |
ff6bc37e | 8401 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0, NULL); |
f0486c68 YZ |
8402 | } |
8403 | ||
fec577fb | 8404 | /* |
f0486c68 | 8405 | * finds a free extent and does all the dirty work required for allocation |
67b7859e | 8406 | * returns the tree buffer or an ERR_PTR on error. |
fec577fb | 8407 | */ |
4d75f8a9 | 8408 | struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, |
310712b2 OS |
8409 | struct btrfs_root *root, |
8410 | u64 parent, u64 root_objectid, | |
8411 | const struct btrfs_disk_key *key, | |
8412 | int level, u64 hint, | |
8413 | u64 empty_size) | |
fec577fb | 8414 | { |
0b246afa | 8415 | struct btrfs_fs_info *fs_info = root->fs_info; |
e2fa7227 | 8416 | struct btrfs_key ins; |
f0486c68 | 8417 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 8418 | struct extent_buffer *buf; |
67b7859e | 8419 | struct btrfs_delayed_extent_op *extent_op; |
f0486c68 YZ |
8420 | u64 flags = 0; |
8421 | int ret; | |
0b246afa JM |
8422 | u32 blocksize = fs_info->nodesize; |
8423 | bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA); | |
fec577fb | 8424 | |
05653ef3 | 8425 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
0b246afa | 8426 | if (btrfs_is_testing(fs_info)) { |
faa2dbf0 | 8427 | buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr, |
bc877d28 | 8428 | level, root_objectid); |
faa2dbf0 JB |
8429 | if (!IS_ERR(buf)) |
8430 | root->alloc_bytenr += blocksize; | |
8431 | return buf; | |
8432 | } | |
05653ef3 | 8433 | #endif |
fccb84c9 | 8434 | |
f0486c68 YZ |
8435 | block_rsv = use_block_rsv(trans, root, blocksize); |
8436 | if (IS_ERR(block_rsv)) | |
8437 | return ERR_CAST(block_rsv); | |
8438 | ||
18513091 | 8439 | ret = btrfs_reserve_extent(root, blocksize, blocksize, blocksize, |
e570fd27 | 8440 | empty_size, hint, &ins, 0, 0); |
67b7859e OS |
8441 | if (ret) |
8442 | goto out_unuse; | |
55c69072 | 8443 | |
bc877d28 NB |
8444 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, level, |
8445 | root_objectid); | |
67b7859e OS |
8446 | if (IS_ERR(buf)) { |
8447 | ret = PTR_ERR(buf); | |
8448 | goto out_free_reserved; | |
8449 | } | |
f0486c68 YZ |
8450 | |
8451 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
8452 | if (parent == 0) | |
8453 | parent = ins.objectid; | |
8454 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
8455 | } else | |
8456 | BUG_ON(parent > 0); | |
8457 | ||
8458 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
78a6184a | 8459 | extent_op = btrfs_alloc_delayed_extent_op(); |
67b7859e OS |
8460 | if (!extent_op) { |
8461 | ret = -ENOMEM; | |
8462 | goto out_free_buf; | |
8463 | } | |
f0486c68 YZ |
8464 | if (key) |
8465 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
8466 | else | |
8467 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
8468 | extent_op->flags_to_set = flags; | |
35b3ad50 DS |
8469 | extent_op->update_key = skinny_metadata ? false : true; |
8470 | extent_op->update_flags = true; | |
8471 | extent_op->is_data = false; | |
b1c79e09 | 8472 | extent_op->level = level; |
f0486c68 | 8473 | |
fd708b81 JB |
8474 | btrfs_ref_tree_mod(root, ins.objectid, ins.offset, parent, |
8475 | root_objectid, level, 0, | |
8476 | BTRFS_ADD_DELAYED_EXTENT); | |
44e1c47d | 8477 | ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, |
7be07912 OS |
8478 | ins.offset, parent, |
8479 | root_objectid, level, | |
67b7859e | 8480 | BTRFS_ADD_DELAYED_EXTENT, |
7be07912 | 8481 | extent_op, NULL, NULL); |
67b7859e OS |
8482 | if (ret) |
8483 | goto out_free_delayed; | |
f0486c68 | 8484 | } |
fec577fb | 8485 | return buf; |
67b7859e OS |
8486 | |
8487 | out_free_delayed: | |
8488 | btrfs_free_delayed_extent_op(extent_op); | |
8489 | out_free_buf: | |
8490 | free_extent_buffer(buf); | |
8491 | out_free_reserved: | |
2ff7e61e | 8492 | btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 0); |
67b7859e | 8493 | out_unuse: |
0b246afa | 8494 | unuse_block_rsv(fs_info, block_rsv, blocksize); |
67b7859e | 8495 | return ERR_PTR(ret); |
fec577fb | 8496 | } |
a28ec197 | 8497 | |
2c47e605 YZ |
8498 | struct walk_control { |
8499 | u64 refs[BTRFS_MAX_LEVEL]; | |
8500 | u64 flags[BTRFS_MAX_LEVEL]; | |
8501 | struct btrfs_key update_progress; | |
8502 | int stage; | |
8503 | int level; | |
8504 | int shared_level; | |
8505 | int update_ref; | |
8506 | int keep_locks; | |
1c4850e2 YZ |
8507 | int reada_slot; |
8508 | int reada_count; | |
2c47e605 YZ |
8509 | }; |
8510 | ||
8511 | #define DROP_REFERENCE 1 | |
8512 | #define UPDATE_BACKREF 2 | |
8513 | ||
1c4850e2 YZ |
8514 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
8515 | struct btrfs_root *root, | |
8516 | struct walk_control *wc, | |
8517 | struct btrfs_path *path) | |
6407bf6d | 8518 | { |
0b246afa | 8519 | struct btrfs_fs_info *fs_info = root->fs_info; |
1c4850e2 YZ |
8520 | u64 bytenr; |
8521 | u64 generation; | |
8522 | u64 refs; | |
94fcca9f | 8523 | u64 flags; |
5d4f98a2 | 8524 | u32 nritems; |
1c4850e2 YZ |
8525 | struct btrfs_key key; |
8526 | struct extent_buffer *eb; | |
6407bf6d | 8527 | int ret; |
1c4850e2 YZ |
8528 | int slot; |
8529 | int nread = 0; | |
6407bf6d | 8530 | |
1c4850e2 YZ |
8531 | if (path->slots[wc->level] < wc->reada_slot) { |
8532 | wc->reada_count = wc->reada_count * 2 / 3; | |
8533 | wc->reada_count = max(wc->reada_count, 2); | |
8534 | } else { | |
8535 | wc->reada_count = wc->reada_count * 3 / 2; | |
8536 | wc->reada_count = min_t(int, wc->reada_count, | |
0b246afa | 8537 | BTRFS_NODEPTRS_PER_BLOCK(fs_info)); |
1c4850e2 | 8538 | } |
7bb86316 | 8539 | |
1c4850e2 YZ |
8540 | eb = path->nodes[wc->level]; |
8541 | nritems = btrfs_header_nritems(eb); | |
bd56b302 | 8542 | |
1c4850e2 YZ |
8543 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
8544 | if (nread >= wc->reada_count) | |
8545 | break; | |
bd56b302 | 8546 | |
2dd3e67b | 8547 | cond_resched(); |
1c4850e2 YZ |
8548 | bytenr = btrfs_node_blockptr(eb, slot); |
8549 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 8550 | |
1c4850e2 YZ |
8551 | if (slot == path->slots[wc->level]) |
8552 | goto reada; | |
5d4f98a2 | 8553 | |
1c4850e2 YZ |
8554 | if (wc->stage == UPDATE_BACKREF && |
8555 | generation <= root->root_key.offset) | |
bd56b302 CM |
8556 | continue; |
8557 | ||
94fcca9f | 8558 | /* We don't lock the tree block, it's OK to be racy here */ |
2ff7e61e | 8559 | ret = btrfs_lookup_extent_info(trans, fs_info, bytenr, |
3173a18f JB |
8560 | wc->level - 1, 1, &refs, |
8561 | &flags); | |
79787eaa JM |
8562 | /* We don't care about errors in readahead. */ |
8563 | if (ret < 0) | |
8564 | continue; | |
94fcca9f YZ |
8565 | BUG_ON(refs == 0); |
8566 | ||
1c4850e2 | 8567 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
8568 | if (refs == 1) |
8569 | goto reada; | |
bd56b302 | 8570 | |
94fcca9f YZ |
8571 | if (wc->level == 1 && |
8572 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8573 | continue; | |
1c4850e2 YZ |
8574 | if (!wc->update_ref || |
8575 | generation <= root->root_key.offset) | |
8576 | continue; | |
8577 | btrfs_node_key_to_cpu(eb, &key, slot); | |
8578 | ret = btrfs_comp_cpu_keys(&key, | |
8579 | &wc->update_progress); | |
8580 | if (ret < 0) | |
8581 | continue; | |
94fcca9f YZ |
8582 | } else { |
8583 | if (wc->level == 1 && | |
8584 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8585 | continue; | |
6407bf6d | 8586 | } |
1c4850e2 | 8587 | reada: |
2ff7e61e | 8588 | readahead_tree_block(fs_info, bytenr); |
1c4850e2 | 8589 | nread++; |
20524f02 | 8590 | } |
1c4850e2 | 8591 | wc->reada_slot = slot; |
20524f02 | 8592 | } |
2c47e605 | 8593 | |
f82d02d9 | 8594 | /* |
2c016dc2 | 8595 | * helper to process tree block while walking down the tree. |
2c47e605 | 8596 | * |
2c47e605 YZ |
8597 | * when wc->stage == UPDATE_BACKREF, this function updates |
8598 | * back refs for pointers in the block. | |
8599 | * | |
8600 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 8601 | */ |
2c47e605 | 8602 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 8603 | struct btrfs_root *root, |
2c47e605 | 8604 | struct btrfs_path *path, |
94fcca9f | 8605 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 8606 | { |
2ff7e61e | 8607 | struct btrfs_fs_info *fs_info = root->fs_info; |
2c47e605 YZ |
8608 | int level = wc->level; |
8609 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 8610 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
8611 | int ret; |
8612 | ||
2c47e605 YZ |
8613 | if (wc->stage == UPDATE_BACKREF && |
8614 | btrfs_header_owner(eb) != root->root_key.objectid) | |
8615 | return 1; | |
f82d02d9 | 8616 | |
2c47e605 YZ |
8617 | /* |
8618 | * when reference count of tree block is 1, it won't increase | |
8619 | * again. once full backref flag is set, we never clear it. | |
8620 | */ | |
94fcca9f YZ |
8621 | if (lookup_info && |
8622 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
8623 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 | 8624 | BUG_ON(!path->locks[level]); |
2ff7e61e | 8625 | ret = btrfs_lookup_extent_info(trans, fs_info, |
3173a18f | 8626 | eb->start, level, 1, |
2c47e605 YZ |
8627 | &wc->refs[level], |
8628 | &wc->flags[level]); | |
79787eaa JM |
8629 | BUG_ON(ret == -ENOMEM); |
8630 | if (ret) | |
8631 | return ret; | |
2c47e605 YZ |
8632 | BUG_ON(wc->refs[level] == 0); |
8633 | } | |
5d4f98a2 | 8634 | |
2c47e605 YZ |
8635 | if (wc->stage == DROP_REFERENCE) { |
8636 | if (wc->refs[level] > 1) | |
8637 | return 1; | |
f82d02d9 | 8638 | |
2c47e605 | 8639 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 8640 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
8641 | path->locks[level] = 0; |
8642 | } | |
8643 | return 0; | |
8644 | } | |
f82d02d9 | 8645 | |
2c47e605 YZ |
8646 | /* wc->stage == UPDATE_BACKREF */ |
8647 | if (!(wc->flags[level] & flag)) { | |
8648 | BUG_ON(!path->locks[level]); | |
e339a6b0 | 8649 | ret = btrfs_inc_ref(trans, root, eb, 1); |
79787eaa | 8650 | BUG_ON(ret); /* -ENOMEM */ |
e339a6b0 | 8651 | ret = btrfs_dec_ref(trans, root, eb, 0); |
79787eaa | 8652 | BUG_ON(ret); /* -ENOMEM */ |
2ff7e61e | 8653 | ret = btrfs_set_disk_extent_flags(trans, fs_info, eb->start, |
b1c79e09 JB |
8654 | eb->len, flag, |
8655 | btrfs_header_level(eb), 0); | |
79787eaa | 8656 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
8657 | wc->flags[level] |= flag; |
8658 | } | |
8659 | ||
8660 | /* | |
8661 | * the block is shared by multiple trees, so it's not good to | |
8662 | * keep the tree lock | |
8663 | */ | |
8664 | if (path->locks[level] && level > 0) { | |
bd681513 | 8665 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
8666 | path->locks[level] = 0; |
8667 | } | |
8668 | return 0; | |
8669 | } | |
8670 | ||
1c4850e2 | 8671 | /* |
2c016dc2 | 8672 | * helper to process tree block pointer. |
1c4850e2 YZ |
8673 | * |
8674 | * when wc->stage == DROP_REFERENCE, this function checks | |
8675 | * reference count of the block pointed to. if the block | |
8676 | * is shared and we need update back refs for the subtree | |
8677 | * rooted at the block, this function changes wc->stage to | |
8678 | * UPDATE_BACKREF. if the block is shared and there is no | |
8679 | * need to update back, this function drops the reference | |
8680 | * to the block. | |
8681 | * | |
8682 | * NOTE: return value 1 means we should stop walking down. | |
8683 | */ | |
8684 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
8685 | struct btrfs_root *root, | |
8686 | struct btrfs_path *path, | |
94fcca9f | 8687 | struct walk_control *wc, int *lookup_info) |
1c4850e2 | 8688 | { |
0b246afa | 8689 | struct btrfs_fs_info *fs_info = root->fs_info; |
1c4850e2 YZ |
8690 | u64 bytenr; |
8691 | u64 generation; | |
8692 | u64 parent; | |
8693 | u32 blocksize; | |
8694 | struct btrfs_key key; | |
581c1760 | 8695 | struct btrfs_key first_key; |
1c4850e2 YZ |
8696 | struct extent_buffer *next; |
8697 | int level = wc->level; | |
8698 | int reada = 0; | |
8699 | int ret = 0; | |
1152651a | 8700 | bool need_account = false; |
1c4850e2 YZ |
8701 | |
8702 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
8703 | path->slots[level]); | |
8704 | /* | |
8705 | * if the lower level block was created before the snapshot | |
8706 | * was created, we know there is no need to update back refs | |
8707 | * for the subtree | |
8708 | */ | |
8709 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
8710 | generation <= root->root_key.offset) { |
8711 | *lookup_info = 1; | |
1c4850e2 | 8712 | return 1; |
94fcca9f | 8713 | } |
1c4850e2 YZ |
8714 | |
8715 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
581c1760 QW |
8716 | btrfs_node_key_to_cpu(path->nodes[level], &first_key, |
8717 | path->slots[level]); | |
0b246afa | 8718 | blocksize = fs_info->nodesize; |
1c4850e2 | 8719 | |
0b246afa | 8720 | next = find_extent_buffer(fs_info, bytenr); |
1c4850e2 | 8721 | if (!next) { |
2ff7e61e | 8722 | next = btrfs_find_create_tree_block(fs_info, bytenr); |
c871b0f2 LB |
8723 | if (IS_ERR(next)) |
8724 | return PTR_ERR(next); | |
8725 | ||
b2aaaa3b JB |
8726 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
8727 | level - 1); | |
1c4850e2 YZ |
8728 | reada = 1; |
8729 | } | |
8730 | btrfs_tree_lock(next); | |
8731 | btrfs_set_lock_blocking(next); | |
8732 | ||
2ff7e61e | 8733 | ret = btrfs_lookup_extent_info(trans, fs_info, bytenr, level - 1, 1, |
94fcca9f YZ |
8734 | &wc->refs[level - 1], |
8735 | &wc->flags[level - 1]); | |
4867268c JB |
8736 | if (ret < 0) |
8737 | goto out_unlock; | |
79787eaa | 8738 | |
c2cf52eb | 8739 | if (unlikely(wc->refs[level - 1] == 0)) { |
0b246afa | 8740 | btrfs_err(fs_info, "Missing references."); |
4867268c JB |
8741 | ret = -EIO; |
8742 | goto out_unlock; | |
c2cf52eb | 8743 | } |
94fcca9f | 8744 | *lookup_info = 0; |
1c4850e2 | 8745 | |
94fcca9f | 8746 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 8747 | if (wc->refs[level - 1] > 1) { |
1152651a | 8748 | need_account = true; |
94fcca9f YZ |
8749 | if (level == 1 && |
8750 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8751 | goto skip; | |
8752 | ||
1c4850e2 YZ |
8753 | if (!wc->update_ref || |
8754 | generation <= root->root_key.offset) | |
8755 | goto skip; | |
8756 | ||
8757 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
8758 | path->slots[level]); | |
8759 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
8760 | if (ret < 0) | |
8761 | goto skip; | |
8762 | ||
8763 | wc->stage = UPDATE_BACKREF; | |
8764 | wc->shared_level = level - 1; | |
8765 | } | |
94fcca9f YZ |
8766 | } else { |
8767 | if (level == 1 && | |
8768 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8769 | goto skip; | |
1c4850e2 YZ |
8770 | } |
8771 | ||
b9fab919 | 8772 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
8773 | btrfs_tree_unlock(next); |
8774 | free_extent_buffer(next); | |
8775 | next = NULL; | |
94fcca9f | 8776 | *lookup_info = 1; |
1c4850e2 YZ |
8777 | } |
8778 | ||
8779 | if (!next) { | |
8780 | if (reada && level == 1) | |
8781 | reada_walk_down(trans, root, wc, path); | |
581c1760 QW |
8782 | next = read_tree_block(fs_info, bytenr, generation, level - 1, |
8783 | &first_key); | |
64c043de LB |
8784 | if (IS_ERR(next)) { |
8785 | return PTR_ERR(next); | |
8786 | } else if (!extent_buffer_uptodate(next)) { | |
416bc658 | 8787 | free_extent_buffer(next); |
97d9a8a4 | 8788 | return -EIO; |
416bc658 | 8789 | } |
1c4850e2 YZ |
8790 | btrfs_tree_lock(next); |
8791 | btrfs_set_lock_blocking(next); | |
8792 | } | |
8793 | ||
8794 | level--; | |
4867268c JB |
8795 | ASSERT(level == btrfs_header_level(next)); |
8796 | if (level != btrfs_header_level(next)) { | |
8797 | btrfs_err(root->fs_info, "mismatched level"); | |
8798 | ret = -EIO; | |
8799 | goto out_unlock; | |
8800 | } | |
1c4850e2 YZ |
8801 | path->nodes[level] = next; |
8802 | path->slots[level] = 0; | |
bd681513 | 8803 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
8804 | wc->level = level; |
8805 | if (wc->level == 1) | |
8806 | wc->reada_slot = 0; | |
8807 | return 0; | |
8808 | skip: | |
8809 | wc->refs[level - 1] = 0; | |
8810 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
8811 | if (wc->stage == DROP_REFERENCE) { |
8812 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
8813 | parent = path->nodes[level]->start; | |
8814 | } else { | |
4867268c | 8815 | ASSERT(root->root_key.objectid == |
94fcca9f | 8816 | btrfs_header_owner(path->nodes[level])); |
4867268c JB |
8817 | if (root->root_key.objectid != |
8818 | btrfs_header_owner(path->nodes[level])) { | |
8819 | btrfs_err(root->fs_info, | |
8820 | "mismatched block owner"); | |
8821 | ret = -EIO; | |
8822 | goto out_unlock; | |
8823 | } | |
94fcca9f YZ |
8824 | parent = 0; |
8825 | } | |
1c4850e2 | 8826 | |
2cd86d30 QW |
8827 | /* |
8828 | * Reloc tree doesn't contribute to qgroup numbers, and we have | |
8829 | * already accounted them at merge time (replace_path), | |
8830 | * thus we could skip expensive subtree trace here. | |
8831 | */ | |
8832 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID && | |
8833 | need_account) { | |
deb40627 | 8834 | ret = btrfs_qgroup_trace_subtree(trans, next, |
33d1f05c | 8835 | generation, level - 1); |
1152651a | 8836 | if (ret) { |
0b246afa | 8837 | btrfs_err_rl(fs_info, |
5d163e0e JM |
8838 | "Error %d accounting shared subtree. Quota is out of sync, rescan required.", |
8839 | ret); | |
1152651a MF |
8840 | } |
8841 | } | |
84f7d8e6 | 8842 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, |
2ff7e61e JM |
8843 | parent, root->root_key.objectid, |
8844 | level - 1, 0); | |
4867268c JB |
8845 | if (ret) |
8846 | goto out_unlock; | |
1c4850e2 | 8847 | } |
4867268c JB |
8848 | |
8849 | *lookup_info = 1; | |
8850 | ret = 1; | |
8851 | ||
8852 | out_unlock: | |
1c4850e2 YZ |
8853 | btrfs_tree_unlock(next); |
8854 | free_extent_buffer(next); | |
4867268c JB |
8855 | |
8856 | return ret; | |
1c4850e2 YZ |
8857 | } |
8858 | ||
2c47e605 | 8859 | /* |
2c016dc2 | 8860 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
8861 | * |
8862 | * when wc->stage == DROP_REFERENCE, this function drops | |
8863 | * reference count on the block. | |
8864 | * | |
8865 | * when wc->stage == UPDATE_BACKREF, this function changes | |
8866 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
8867 | * to UPDATE_BACKREF previously while processing the block. | |
8868 | * | |
8869 | * NOTE: return value 1 means we should stop walking up. | |
8870 | */ | |
8871 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
8872 | struct btrfs_root *root, | |
8873 | struct btrfs_path *path, | |
8874 | struct walk_control *wc) | |
8875 | { | |
0b246afa | 8876 | struct btrfs_fs_info *fs_info = root->fs_info; |
f0486c68 | 8877 | int ret; |
2c47e605 YZ |
8878 | int level = wc->level; |
8879 | struct extent_buffer *eb = path->nodes[level]; | |
8880 | u64 parent = 0; | |
8881 | ||
8882 | if (wc->stage == UPDATE_BACKREF) { | |
8883 | BUG_ON(wc->shared_level < level); | |
8884 | if (level < wc->shared_level) | |
8885 | goto out; | |
8886 | ||
2c47e605 YZ |
8887 | ret = find_next_key(path, level + 1, &wc->update_progress); |
8888 | if (ret > 0) | |
8889 | wc->update_ref = 0; | |
8890 | ||
8891 | wc->stage = DROP_REFERENCE; | |
8892 | wc->shared_level = -1; | |
8893 | path->slots[level] = 0; | |
8894 | ||
8895 | /* | |
8896 | * check reference count again if the block isn't locked. | |
8897 | * we should start walking down the tree again if reference | |
8898 | * count is one. | |
8899 | */ | |
8900 | if (!path->locks[level]) { | |
8901 | BUG_ON(level == 0); | |
8902 | btrfs_tree_lock(eb); | |
8903 | btrfs_set_lock_blocking(eb); | |
bd681513 | 8904 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 | 8905 | |
2ff7e61e | 8906 | ret = btrfs_lookup_extent_info(trans, fs_info, |
3173a18f | 8907 | eb->start, level, 1, |
2c47e605 YZ |
8908 | &wc->refs[level], |
8909 | &wc->flags[level]); | |
79787eaa JM |
8910 | if (ret < 0) { |
8911 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 8912 | path->locks[level] = 0; |
79787eaa JM |
8913 | return ret; |
8914 | } | |
2c47e605 YZ |
8915 | BUG_ON(wc->refs[level] == 0); |
8916 | if (wc->refs[level] == 1) { | |
bd681513 | 8917 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 8918 | path->locks[level] = 0; |
2c47e605 YZ |
8919 | return 1; |
8920 | } | |
f82d02d9 | 8921 | } |
2c47e605 | 8922 | } |
f82d02d9 | 8923 | |
2c47e605 YZ |
8924 | /* wc->stage == DROP_REFERENCE */ |
8925 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 8926 | |
2c47e605 YZ |
8927 | if (wc->refs[level] == 1) { |
8928 | if (level == 0) { | |
8929 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
e339a6b0 | 8930 | ret = btrfs_dec_ref(trans, root, eb, 1); |
2c47e605 | 8931 | else |
e339a6b0 | 8932 | ret = btrfs_dec_ref(trans, root, eb, 0); |
79787eaa | 8933 | BUG_ON(ret); /* -ENOMEM */ |
8d38d7eb | 8934 | ret = btrfs_qgroup_trace_leaf_items(trans, eb); |
1152651a | 8935 | if (ret) { |
0b246afa | 8936 | btrfs_err_rl(fs_info, |
5d163e0e JM |
8937 | "error %d accounting leaf items. Quota is out of sync, rescan required.", |
8938 | ret); | |
1152651a | 8939 | } |
2c47e605 YZ |
8940 | } |
8941 | /* make block locked assertion in clean_tree_block happy */ | |
8942 | if (!path->locks[level] && | |
8943 | btrfs_header_generation(eb) == trans->transid) { | |
8944 | btrfs_tree_lock(eb); | |
8945 | btrfs_set_lock_blocking(eb); | |
bd681513 | 8946 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 | 8947 | } |
7c302b49 | 8948 | clean_tree_block(fs_info, eb); |
2c47e605 YZ |
8949 | } |
8950 | ||
8951 | if (eb == root->node) { | |
8952 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8953 | parent = eb->start; | |
65c6e82b QW |
8954 | else if (root->root_key.objectid != btrfs_header_owner(eb)) |
8955 | goto owner_mismatch; | |
2c47e605 YZ |
8956 | } else { |
8957 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8958 | parent = path->nodes[level + 1]->start; | |
65c6e82b QW |
8959 | else if (root->root_key.objectid != |
8960 | btrfs_header_owner(path->nodes[level + 1])) | |
8961 | goto owner_mismatch; | |
f82d02d9 | 8962 | } |
f82d02d9 | 8963 | |
5581a51a | 8964 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
8965 | out: |
8966 | wc->refs[level] = 0; | |
8967 | wc->flags[level] = 0; | |
f0486c68 | 8968 | return 0; |
65c6e82b QW |
8969 | |
8970 | owner_mismatch: | |
8971 | btrfs_err_rl(fs_info, "unexpected tree owner, have %llu expect %llu", | |
8972 | btrfs_header_owner(eb), root->root_key.objectid); | |
8973 | return -EUCLEAN; | |
2c47e605 YZ |
8974 | } |
8975 | ||
8976 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
8977 | struct btrfs_root *root, | |
8978 | struct btrfs_path *path, | |
8979 | struct walk_control *wc) | |
8980 | { | |
2c47e605 | 8981 | int level = wc->level; |
94fcca9f | 8982 | int lookup_info = 1; |
2c47e605 YZ |
8983 | int ret; |
8984 | ||
8985 | while (level >= 0) { | |
94fcca9f | 8986 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
8987 | if (ret > 0) |
8988 | break; | |
8989 | ||
8990 | if (level == 0) | |
8991 | break; | |
8992 | ||
7a7965f8 YZ |
8993 | if (path->slots[level] >= |
8994 | btrfs_header_nritems(path->nodes[level])) | |
8995 | break; | |
8996 | ||
94fcca9f | 8997 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
8998 | if (ret > 0) { |
8999 | path->slots[level]++; | |
9000 | continue; | |
90d2c51d MX |
9001 | } else if (ret < 0) |
9002 | return ret; | |
1c4850e2 | 9003 | level = wc->level; |
f82d02d9 | 9004 | } |
f82d02d9 YZ |
9005 | return 0; |
9006 | } | |
9007 | ||
d397712b | 9008 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 9009 | struct btrfs_root *root, |
f82d02d9 | 9010 | struct btrfs_path *path, |
2c47e605 | 9011 | struct walk_control *wc, int max_level) |
20524f02 | 9012 | { |
2c47e605 | 9013 | int level = wc->level; |
20524f02 | 9014 | int ret; |
9f3a7427 | 9015 | |
2c47e605 YZ |
9016 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
9017 | while (level < max_level && path->nodes[level]) { | |
9018 | wc->level = level; | |
9019 | if (path->slots[level] + 1 < | |
9020 | btrfs_header_nritems(path->nodes[level])) { | |
9021 | path->slots[level]++; | |
20524f02 CM |
9022 | return 0; |
9023 | } else { | |
2c47e605 YZ |
9024 | ret = walk_up_proc(trans, root, path, wc); |
9025 | if (ret > 0) | |
9026 | return 0; | |
65c6e82b QW |
9027 | if (ret < 0) |
9028 | return ret; | |
bd56b302 | 9029 | |
2c47e605 | 9030 | if (path->locks[level]) { |
bd681513 CM |
9031 | btrfs_tree_unlock_rw(path->nodes[level], |
9032 | path->locks[level]); | |
2c47e605 | 9033 | path->locks[level] = 0; |
f82d02d9 | 9034 | } |
2c47e605 YZ |
9035 | free_extent_buffer(path->nodes[level]); |
9036 | path->nodes[level] = NULL; | |
9037 | level++; | |
20524f02 CM |
9038 | } |
9039 | } | |
9040 | return 1; | |
9041 | } | |
9042 | ||
9aca1d51 | 9043 | /* |
2c47e605 YZ |
9044 | * drop a subvolume tree. |
9045 | * | |
9046 | * this function traverses the tree freeing any blocks that only | |
9047 | * referenced by the tree. | |
9048 | * | |
9049 | * when a shared tree block is found. this function decreases its | |
9050 | * reference count by one. if update_ref is true, this function | |
9051 | * also make sure backrefs for the shared block and all lower level | |
9052 | * blocks are properly updated. | |
9d1a2a3a DS |
9053 | * |
9054 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 9055 | */ |
2c536799 | 9056 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
9057 | struct btrfs_block_rsv *block_rsv, int update_ref, |
9058 | int for_reloc) | |
20524f02 | 9059 | { |
ab8d0fc4 | 9060 | struct btrfs_fs_info *fs_info = root->fs_info; |
5caf2a00 | 9061 | struct btrfs_path *path; |
2c47e605 | 9062 | struct btrfs_trans_handle *trans; |
ab8d0fc4 | 9063 | struct btrfs_root *tree_root = fs_info->tree_root; |
9f3a7427 | 9064 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
9065 | struct walk_control *wc; |
9066 | struct btrfs_key key; | |
9067 | int err = 0; | |
9068 | int ret; | |
9069 | int level; | |
d29a9f62 | 9070 | bool root_dropped = false; |
20524f02 | 9071 | |
4fd786e6 | 9072 | btrfs_debug(fs_info, "Drop subvolume %llu", root->root_key.objectid); |
1152651a | 9073 | |
5caf2a00 | 9074 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
9075 | if (!path) { |
9076 | err = -ENOMEM; | |
9077 | goto out; | |
9078 | } | |
20524f02 | 9079 | |
2c47e605 | 9080 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
9081 | if (!wc) { |
9082 | btrfs_free_path(path); | |
cb1b69f4 TI |
9083 | err = -ENOMEM; |
9084 | goto out; | |
38a1a919 | 9085 | } |
2c47e605 | 9086 | |
a22285a6 | 9087 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
9088 | if (IS_ERR(trans)) { |
9089 | err = PTR_ERR(trans); | |
9090 | goto out_free; | |
9091 | } | |
98d5dc13 | 9092 | |
3fd0a558 YZ |
9093 | if (block_rsv) |
9094 | trans->block_rsv = block_rsv; | |
2c47e605 | 9095 | |
9f3a7427 | 9096 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 9097 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
9098 | path->nodes[level] = btrfs_lock_root_node(root); |
9099 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 9100 | path->slots[level] = 0; |
bd681513 | 9101 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
9102 | memset(&wc->update_progress, 0, |
9103 | sizeof(wc->update_progress)); | |
9f3a7427 | 9104 | } else { |
9f3a7427 | 9105 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
9106 | memcpy(&wc->update_progress, &key, |
9107 | sizeof(wc->update_progress)); | |
9108 | ||
6702ed49 | 9109 | level = root_item->drop_level; |
2c47e605 | 9110 | BUG_ON(level == 0); |
6702ed49 | 9111 | path->lowest_level = level; |
2c47e605 YZ |
9112 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
9113 | path->lowest_level = 0; | |
9114 | if (ret < 0) { | |
9115 | err = ret; | |
79787eaa | 9116 | goto out_end_trans; |
9f3a7427 | 9117 | } |
1c4850e2 | 9118 | WARN_ON(ret > 0); |
2c47e605 | 9119 | |
7d9eb12c CM |
9120 | /* |
9121 | * unlock our path, this is safe because only this | |
9122 | * function is allowed to delete this snapshot | |
9123 | */ | |
5d4f98a2 | 9124 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
9125 | |
9126 | level = btrfs_header_level(root->node); | |
9127 | while (1) { | |
9128 | btrfs_tree_lock(path->nodes[level]); | |
9129 | btrfs_set_lock_blocking(path->nodes[level]); | |
fec386ac | 9130 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 | 9131 | |
2ff7e61e | 9132 | ret = btrfs_lookup_extent_info(trans, fs_info, |
2c47e605 | 9133 | path->nodes[level]->start, |
3173a18f | 9134 | level, 1, &wc->refs[level], |
2c47e605 | 9135 | &wc->flags[level]); |
79787eaa JM |
9136 | if (ret < 0) { |
9137 | err = ret; | |
9138 | goto out_end_trans; | |
9139 | } | |
2c47e605 YZ |
9140 | BUG_ON(wc->refs[level] == 0); |
9141 | ||
9142 | if (level == root_item->drop_level) | |
9143 | break; | |
9144 | ||
9145 | btrfs_tree_unlock(path->nodes[level]); | |
fec386ac | 9146 | path->locks[level] = 0; |
2c47e605 YZ |
9147 | WARN_ON(wc->refs[level] != 1); |
9148 | level--; | |
9149 | } | |
9f3a7427 | 9150 | } |
2c47e605 YZ |
9151 | |
9152 | wc->level = level; | |
9153 | wc->shared_level = -1; | |
9154 | wc->stage = DROP_REFERENCE; | |
9155 | wc->update_ref = update_ref; | |
9156 | wc->keep_locks = 0; | |
0b246afa | 9157 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info); |
2c47e605 | 9158 | |
d397712b | 9159 | while (1) { |
9d1a2a3a | 9160 | |
2c47e605 YZ |
9161 | ret = walk_down_tree(trans, root, path, wc); |
9162 | if (ret < 0) { | |
9163 | err = ret; | |
20524f02 | 9164 | break; |
2c47e605 | 9165 | } |
9aca1d51 | 9166 | |
2c47e605 YZ |
9167 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
9168 | if (ret < 0) { | |
9169 | err = ret; | |
20524f02 | 9170 | break; |
2c47e605 YZ |
9171 | } |
9172 | ||
9173 | if (ret > 0) { | |
9174 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
9175 | break; |
9176 | } | |
2c47e605 YZ |
9177 | |
9178 | if (wc->stage == DROP_REFERENCE) { | |
9179 | level = wc->level; | |
9180 | btrfs_node_key(path->nodes[level], | |
9181 | &root_item->drop_progress, | |
9182 | path->slots[level]); | |
9183 | root_item->drop_level = level; | |
9184 | } | |
9185 | ||
9186 | BUG_ON(wc->level == 0); | |
3a45bb20 | 9187 | if (btrfs_should_end_transaction(trans) || |
2ff7e61e | 9188 | (!for_reloc && btrfs_need_cleaner_sleep(fs_info))) { |
2c47e605 YZ |
9189 | ret = btrfs_update_root(trans, tree_root, |
9190 | &root->root_key, | |
9191 | root_item); | |
79787eaa | 9192 | if (ret) { |
66642832 | 9193 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
9194 | err = ret; |
9195 | goto out_end_trans; | |
9196 | } | |
2c47e605 | 9197 | |
3a45bb20 | 9198 | btrfs_end_transaction_throttle(trans); |
2ff7e61e | 9199 | if (!for_reloc && btrfs_need_cleaner_sleep(fs_info)) { |
ab8d0fc4 JM |
9200 | btrfs_debug(fs_info, |
9201 | "drop snapshot early exit"); | |
3c8f2422 JB |
9202 | err = -EAGAIN; |
9203 | goto out_free; | |
9204 | } | |
9205 | ||
a22285a6 | 9206 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
9207 | if (IS_ERR(trans)) { |
9208 | err = PTR_ERR(trans); | |
9209 | goto out_free; | |
9210 | } | |
3fd0a558 YZ |
9211 | if (block_rsv) |
9212 | trans->block_rsv = block_rsv; | |
c3e69d58 | 9213 | } |
20524f02 | 9214 | } |
b3b4aa74 | 9215 | btrfs_release_path(path); |
79787eaa JM |
9216 | if (err) |
9217 | goto out_end_trans; | |
2c47e605 | 9218 | |
ab9ce7d4 | 9219 | ret = btrfs_del_root(trans, &root->root_key); |
79787eaa | 9220 | if (ret) { |
66642832 | 9221 | btrfs_abort_transaction(trans, ret); |
e19182c0 | 9222 | err = ret; |
79787eaa JM |
9223 | goto out_end_trans; |
9224 | } | |
2c47e605 | 9225 | |
76dda93c | 9226 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
cb517eab MX |
9227 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
9228 | NULL, NULL); | |
79787eaa | 9229 | if (ret < 0) { |
66642832 | 9230 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
9231 | err = ret; |
9232 | goto out_end_trans; | |
9233 | } else if (ret > 0) { | |
84cd948c JB |
9234 | /* if we fail to delete the orphan item this time |
9235 | * around, it'll get picked up the next time. | |
9236 | * | |
9237 | * The most common failure here is just -ENOENT. | |
9238 | */ | |
9239 | btrfs_del_orphan_item(trans, tree_root, | |
9240 | root->root_key.objectid); | |
76dda93c YZ |
9241 | } |
9242 | } | |
9243 | ||
27cdeb70 | 9244 | if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) { |
2b9dbef2 | 9245 | btrfs_add_dropped_root(trans, root); |
76dda93c YZ |
9246 | } else { |
9247 | free_extent_buffer(root->node); | |
9248 | free_extent_buffer(root->commit_root); | |
b0feb9d9 | 9249 | btrfs_put_fs_root(root); |
76dda93c | 9250 | } |
d29a9f62 | 9251 | root_dropped = true; |
79787eaa | 9252 | out_end_trans: |
3a45bb20 | 9253 | btrfs_end_transaction_throttle(trans); |
79787eaa | 9254 | out_free: |
2c47e605 | 9255 | kfree(wc); |
5caf2a00 | 9256 | btrfs_free_path(path); |
cb1b69f4 | 9257 | out: |
d29a9f62 JB |
9258 | /* |
9259 | * So if we need to stop dropping the snapshot for whatever reason we | |
9260 | * need to make sure to add it back to the dead root list so that we | |
9261 | * keep trying to do the work later. This also cleans up roots if we | |
9262 | * don't have it in the radix (like when we recover after a power fail | |
9263 | * or unmount) so we don't leak memory. | |
9264 | */ | |
897ca819 | 9265 | if (!for_reloc && !root_dropped) |
d29a9f62 | 9266 | btrfs_add_dead_root(root); |
90515e7f | 9267 | if (err && err != -EAGAIN) |
ab8d0fc4 | 9268 | btrfs_handle_fs_error(fs_info, err, NULL); |
2c536799 | 9269 | return err; |
20524f02 | 9270 | } |
9078a3e1 | 9271 | |
2c47e605 YZ |
9272 | /* |
9273 | * drop subtree rooted at tree block 'node'. | |
9274 | * | |
9275 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 9276 | * only used by relocation code |
2c47e605 | 9277 | */ |
f82d02d9 YZ |
9278 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
9279 | struct btrfs_root *root, | |
9280 | struct extent_buffer *node, | |
9281 | struct extent_buffer *parent) | |
9282 | { | |
0b246afa | 9283 | struct btrfs_fs_info *fs_info = root->fs_info; |
f82d02d9 | 9284 | struct btrfs_path *path; |
2c47e605 | 9285 | struct walk_control *wc; |
f82d02d9 YZ |
9286 | int level; |
9287 | int parent_level; | |
9288 | int ret = 0; | |
9289 | int wret; | |
9290 | ||
2c47e605 YZ |
9291 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
9292 | ||
f82d02d9 | 9293 | path = btrfs_alloc_path(); |
db5b493a TI |
9294 | if (!path) |
9295 | return -ENOMEM; | |
f82d02d9 | 9296 | |
2c47e605 | 9297 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
9298 | if (!wc) { |
9299 | btrfs_free_path(path); | |
9300 | return -ENOMEM; | |
9301 | } | |
2c47e605 | 9302 | |
b9447ef8 | 9303 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
9304 | parent_level = btrfs_header_level(parent); |
9305 | extent_buffer_get(parent); | |
9306 | path->nodes[parent_level] = parent; | |
9307 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
9308 | ||
b9447ef8 | 9309 | btrfs_assert_tree_locked(node); |
f82d02d9 | 9310 | level = btrfs_header_level(node); |
f82d02d9 YZ |
9311 | path->nodes[level] = node; |
9312 | path->slots[level] = 0; | |
bd681513 | 9313 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
9314 | |
9315 | wc->refs[parent_level] = 1; | |
9316 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
9317 | wc->level = level; | |
9318 | wc->shared_level = -1; | |
9319 | wc->stage = DROP_REFERENCE; | |
9320 | wc->update_ref = 0; | |
9321 | wc->keep_locks = 1; | |
0b246afa | 9322 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info); |
f82d02d9 YZ |
9323 | |
9324 | while (1) { | |
2c47e605 YZ |
9325 | wret = walk_down_tree(trans, root, path, wc); |
9326 | if (wret < 0) { | |
f82d02d9 | 9327 | ret = wret; |
f82d02d9 | 9328 | break; |
2c47e605 | 9329 | } |
f82d02d9 | 9330 | |
2c47e605 | 9331 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
9332 | if (wret < 0) |
9333 | ret = wret; | |
9334 | if (wret != 0) | |
9335 | break; | |
9336 | } | |
9337 | ||
2c47e605 | 9338 | kfree(wc); |
f82d02d9 YZ |
9339 | btrfs_free_path(path); |
9340 | return ret; | |
9341 | } | |
9342 | ||
6202df69 | 9343 | static u64 update_block_group_flags(struct btrfs_fs_info *fs_info, u64 flags) |
ec44a35c CM |
9344 | { |
9345 | u64 num_devices; | |
fc67c450 | 9346 | u64 stripped; |
e4d8ec0f | 9347 | |
fc67c450 ID |
9348 | /* |
9349 | * if restripe for this chunk_type is on pick target profile and | |
9350 | * return, otherwise do the usual balance | |
9351 | */ | |
6202df69 | 9352 | stripped = get_restripe_target(fs_info, flags); |
fc67c450 ID |
9353 | if (stripped) |
9354 | return extended_to_chunk(stripped); | |
e4d8ec0f | 9355 | |
6202df69 | 9356 | num_devices = fs_info->fs_devices->rw_devices; |
cd02dca5 | 9357 | |
fc67c450 | 9358 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 9359 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
9360 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
9361 | ||
ec44a35c CM |
9362 | if (num_devices == 1) { |
9363 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
9364 | stripped = flags & ~stripped; | |
9365 | ||
9366 | /* turn raid0 into single device chunks */ | |
9367 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
9368 | return stripped; | |
9369 | ||
9370 | /* turn mirroring into duplication */ | |
9371 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
9372 | BTRFS_BLOCK_GROUP_RAID10)) | |
9373 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
9374 | } else { |
9375 | /* they already had raid on here, just return */ | |
ec44a35c CM |
9376 | if (flags & stripped) |
9377 | return flags; | |
9378 | ||
9379 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
9380 | stripped = flags & ~stripped; | |
9381 | ||
9382 | /* switch duplicated blocks with raid1 */ | |
9383 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
9384 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
9385 | ||
e3176ca2 | 9386 | /* this is drive concat, leave it alone */ |
ec44a35c | 9387 | } |
e3176ca2 | 9388 | |
ec44a35c CM |
9389 | return flags; |
9390 | } | |
9391 | ||
868f401a | 9392 | static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 9393 | { |
f0486c68 YZ |
9394 | struct btrfs_space_info *sinfo = cache->space_info; |
9395 | u64 num_bytes; | |
199c36ea | 9396 | u64 min_allocable_bytes; |
f0486c68 | 9397 | int ret = -ENOSPC; |
0ef3e66b | 9398 | |
199c36ea MX |
9399 | /* |
9400 | * We need some metadata space and system metadata space for | |
9401 | * allocating chunks in some corner cases until we force to set | |
9402 | * it to be readonly. | |
9403 | */ | |
9404 | if ((sinfo->flags & | |
9405 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
9406 | !force) | |
ee22184b | 9407 | min_allocable_bytes = SZ_1M; |
199c36ea MX |
9408 | else |
9409 | min_allocable_bytes = 0; | |
9410 | ||
f0486c68 YZ |
9411 | spin_lock(&sinfo->lock); |
9412 | spin_lock(&cache->lock); | |
61cfea9b W |
9413 | |
9414 | if (cache->ro) { | |
868f401a | 9415 | cache->ro++; |
61cfea9b W |
9416 | ret = 0; |
9417 | goto out; | |
9418 | } | |
9419 | ||
f0486c68 YZ |
9420 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
9421 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
9422 | ||
4136135b | 9423 | if (btrfs_space_info_used(sinfo, true) + num_bytes + |
37be25bc | 9424 | min_allocable_bytes <= sinfo->total_bytes) { |
f0486c68 | 9425 | sinfo->bytes_readonly += num_bytes; |
868f401a | 9426 | cache->ro++; |
633c0aad | 9427 | list_add_tail(&cache->ro_list, &sinfo->ro_bgs); |
f0486c68 YZ |
9428 | ret = 0; |
9429 | } | |
61cfea9b | 9430 | out: |
f0486c68 YZ |
9431 | spin_unlock(&cache->lock); |
9432 | spin_unlock(&sinfo->lock); | |
9433 | return ret; | |
9434 | } | |
7d9eb12c | 9435 | |
c83488af | 9436 | int btrfs_inc_block_group_ro(struct btrfs_block_group_cache *cache) |
c286ac48 | 9437 | |
f0486c68 | 9438 | { |
c83488af | 9439 | struct btrfs_fs_info *fs_info = cache->fs_info; |
f0486c68 YZ |
9440 | struct btrfs_trans_handle *trans; |
9441 | u64 alloc_flags; | |
9442 | int ret; | |
7d9eb12c | 9443 | |
1bbc621e | 9444 | again: |
5e00f193 | 9445 | trans = btrfs_join_transaction(fs_info->extent_root); |
79787eaa JM |
9446 | if (IS_ERR(trans)) |
9447 | return PTR_ERR(trans); | |
5d4f98a2 | 9448 | |
1bbc621e CM |
9449 | /* |
9450 | * we're not allowed to set block groups readonly after the dirty | |
9451 | * block groups cache has started writing. If it already started, | |
9452 | * back off and let this transaction commit | |
9453 | */ | |
0b246afa | 9454 | mutex_lock(&fs_info->ro_block_group_mutex); |
3204d33c | 9455 | if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &trans->transaction->flags)) { |
1bbc621e CM |
9456 | u64 transid = trans->transid; |
9457 | ||
0b246afa | 9458 | mutex_unlock(&fs_info->ro_block_group_mutex); |
3a45bb20 | 9459 | btrfs_end_transaction(trans); |
1bbc621e | 9460 | |
2ff7e61e | 9461 | ret = btrfs_wait_for_commit(fs_info, transid); |
1bbc621e CM |
9462 | if (ret) |
9463 | return ret; | |
9464 | goto again; | |
9465 | } | |
9466 | ||
153c35b6 CM |
9467 | /* |
9468 | * if we are changing raid levels, try to allocate a corresponding | |
9469 | * block group with the new raid level. | |
9470 | */ | |
0b246afa | 9471 | alloc_flags = update_block_group_flags(fs_info, cache->flags); |
153c35b6 | 9472 | if (alloc_flags != cache->flags) { |
01458828 | 9473 | ret = do_chunk_alloc(trans, alloc_flags, |
153c35b6 CM |
9474 | CHUNK_ALLOC_FORCE); |
9475 | /* | |
9476 | * ENOSPC is allowed here, we may have enough space | |
9477 | * already allocated at the new raid level to | |
9478 | * carry on | |
9479 | */ | |
9480 | if (ret == -ENOSPC) | |
9481 | ret = 0; | |
9482 | if (ret < 0) | |
9483 | goto out; | |
9484 | } | |
1bbc621e | 9485 | |
868f401a | 9486 | ret = inc_block_group_ro(cache, 0); |
f0486c68 YZ |
9487 | if (!ret) |
9488 | goto out; | |
2ff7e61e | 9489 | alloc_flags = get_alloc_profile(fs_info, cache->space_info->flags); |
01458828 | 9490 | ret = do_chunk_alloc(trans, alloc_flags, CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
9491 | if (ret < 0) |
9492 | goto out; | |
868f401a | 9493 | ret = inc_block_group_ro(cache, 0); |
f0486c68 | 9494 | out: |
2f081088 | 9495 | if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
0b246afa | 9496 | alloc_flags = update_block_group_flags(fs_info, cache->flags); |
34441361 | 9497 | mutex_lock(&fs_info->chunk_mutex); |
451a2c13 | 9498 | check_system_chunk(trans, alloc_flags); |
34441361 | 9499 | mutex_unlock(&fs_info->chunk_mutex); |
2f081088 | 9500 | } |
0b246afa | 9501 | mutex_unlock(&fs_info->ro_block_group_mutex); |
2f081088 | 9502 | |
3a45bb20 | 9503 | btrfs_end_transaction(trans); |
f0486c68 YZ |
9504 | return ret; |
9505 | } | |
5d4f98a2 | 9506 | |
43a7e99d | 9507 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type) |
c87f08ca | 9508 | { |
43a7e99d | 9509 | u64 alloc_flags = get_alloc_profile(trans->fs_info, type); |
2ff7e61e | 9510 | |
01458828 | 9511 | return do_chunk_alloc(trans, alloc_flags, CHUNK_ALLOC_FORCE); |
c87f08ca CM |
9512 | } |
9513 | ||
6d07bcec MX |
9514 | /* |
9515 | * helper to account the unused space of all the readonly block group in the | |
633c0aad | 9516 | * space_info. takes mirrors into account. |
6d07bcec | 9517 | */ |
633c0aad | 9518 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) |
6d07bcec MX |
9519 | { |
9520 | struct btrfs_block_group_cache *block_group; | |
9521 | u64 free_bytes = 0; | |
9522 | int factor; | |
9523 | ||
01327610 | 9524 | /* It's df, we don't care if it's racy */ |
633c0aad JB |
9525 | if (list_empty(&sinfo->ro_bgs)) |
9526 | return 0; | |
9527 | ||
9528 | spin_lock(&sinfo->lock); | |
9529 | list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) { | |
6d07bcec MX |
9530 | spin_lock(&block_group->lock); |
9531 | ||
9532 | if (!block_group->ro) { | |
9533 | spin_unlock(&block_group->lock); | |
9534 | continue; | |
9535 | } | |
9536 | ||
46df06b8 | 9537 | factor = btrfs_bg_type_to_factor(block_group->flags); |
6d07bcec MX |
9538 | free_bytes += (block_group->key.offset - |
9539 | btrfs_block_group_used(&block_group->item)) * | |
9540 | factor; | |
9541 | ||
9542 | spin_unlock(&block_group->lock); | |
9543 | } | |
6d07bcec MX |
9544 | spin_unlock(&sinfo->lock); |
9545 | ||
9546 | return free_bytes; | |
9547 | } | |
9548 | ||
2ff7e61e | 9549 | void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache) |
5d4f98a2 | 9550 | { |
f0486c68 YZ |
9551 | struct btrfs_space_info *sinfo = cache->space_info; |
9552 | u64 num_bytes; | |
9553 | ||
9554 | BUG_ON(!cache->ro); | |
9555 | ||
9556 | spin_lock(&sinfo->lock); | |
9557 | spin_lock(&cache->lock); | |
868f401a Z |
9558 | if (!--cache->ro) { |
9559 | num_bytes = cache->key.offset - cache->reserved - | |
9560 | cache->pinned - cache->bytes_super - | |
9561 | btrfs_block_group_used(&cache->item); | |
9562 | sinfo->bytes_readonly -= num_bytes; | |
9563 | list_del_init(&cache->ro_list); | |
9564 | } | |
f0486c68 YZ |
9565 | spin_unlock(&cache->lock); |
9566 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
9567 | } |
9568 | ||
ba1bf481 JB |
9569 | /* |
9570 | * checks to see if its even possible to relocate this block group. | |
9571 | * | |
9572 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
9573 | * ok to go ahead and try. | |
9574 | */ | |
6bccf3ab | 9575 | int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr) |
1a40e23b | 9576 | { |
6bccf3ab | 9577 | struct btrfs_root *root = fs_info->extent_root; |
ba1bf481 JB |
9578 | struct btrfs_block_group_cache *block_group; |
9579 | struct btrfs_space_info *space_info; | |
0b246afa | 9580 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
ba1bf481 | 9581 | struct btrfs_device *device; |
6df9a95e | 9582 | struct btrfs_trans_handle *trans; |
cdcb725c | 9583 | u64 min_free; |
6719db6a JB |
9584 | u64 dev_min = 1; |
9585 | u64 dev_nr = 0; | |
4a5e98f5 | 9586 | u64 target; |
0305bc27 | 9587 | int debug; |
cdcb725c | 9588 | int index; |
ba1bf481 JB |
9589 | int full = 0; |
9590 | int ret = 0; | |
1a40e23b | 9591 | |
0b246afa | 9592 | debug = btrfs_test_opt(fs_info, ENOSPC_DEBUG); |
0305bc27 | 9593 | |
0b246afa | 9594 | block_group = btrfs_lookup_block_group(fs_info, bytenr); |
1a40e23b | 9595 | |
ba1bf481 | 9596 | /* odd, couldn't find the block group, leave it alone */ |
0305bc27 QW |
9597 | if (!block_group) { |
9598 | if (debug) | |
0b246afa | 9599 | btrfs_warn(fs_info, |
0305bc27 QW |
9600 | "can't find block group for bytenr %llu", |
9601 | bytenr); | |
ba1bf481 | 9602 | return -1; |
0305bc27 | 9603 | } |
1a40e23b | 9604 | |
cdcb725c | 9605 | min_free = btrfs_block_group_used(&block_group->item); |
9606 | ||
ba1bf481 | 9607 | /* no bytes used, we're good */ |
cdcb725c | 9608 | if (!min_free) |
1a40e23b ZY |
9609 | goto out; |
9610 | ||
ba1bf481 JB |
9611 | space_info = block_group->space_info; |
9612 | spin_lock(&space_info->lock); | |
17d217fe | 9613 | |
ba1bf481 | 9614 | full = space_info->full; |
17d217fe | 9615 | |
ba1bf481 JB |
9616 | /* |
9617 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
9618 | * relocate it unless we're able to allocate a new chunk below. |
9619 | * | |
9620 | * Otherwise, we need to make sure we have room in the space to handle | |
9621 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 9622 | */ |
7ce618db | 9623 | if ((space_info->total_bytes != block_group->key.offset) && |
4136135b LB |
9624 | (btrfs_space_info_used(space_info, false) + min_free < |
9625 | space_info->total_bytes)) { | |
ba1bf481 JB |
9626 | spin_unlock(&space_info->lock); |
9627 | goto out; | |
17d217fe | 9628 | } |
ba1bf481 | 9629 | spin_unlock(&space_info->lock); |
ea8c2819 | 9630 | |
ba1bf481 JB |
9631 | /* |
9632 | * ok we don't have enough space, but maybe we have free space on our | |
9633 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
9634 | * alloc devices and guess if we have enough space. if this block |
9635 | * group is going to be restriped, run checks against the target | |
9636 | * profile instead of the current one. | |
ba1bf481 JB |
9637 | */ |
9638 | ret = -1; | |
ea8c2819 | 9639 | |
cdcb725c | 9640 | /* |
9641 | * index: | |
9642 | * 0: raid10 | |
9643 | * 1: raid1 | |
9644 | * 2: dup | |
9645 | * 3: raid0 | |
9646 | * 4: single | |
9647 | */ | |
0b246afa | 9648 | target = get_restripe_target(fs_info, block_group->flags); |
4a5e98f5 | 9649 | if (target) { |
3e72ee88 | 9650 | index = btrfs_bg_flags_to_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
9651 | } else { |
9652 | /* | |
9653 | * this is just a balance, so if we were marked as full | |
9654 | * we know there is no space for a new chunk | |
9655 | */ | |
0305bc27 QW |
9656 | if (full) { |
9657 | if (debug) | |
0b246afa JM |
9658 | btrfs_warn(fs_info, |
9659 | "no space to alloc new chunk for block group %llu", | |
9660 | block_group->key.objectid); | |
4a5e98f5 | 9661 | goto out; |
0305bc27 | 9662 | } |
4a5e98f5 | 9663 | |
3e72ee88 | 9664 | index = btrfs_bg_flags_to_raid_index(block_group->flags); |
4a5e98f5 ID |
9665 | } |
9666 | ||
e6ec716f | 9667 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 9668 | dev_min = 4; |
6719db6a JB |
9669 | /* Divide by 2 */ |
9670 | min_free >>= 1; | |
e6ec716f | 9671 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 9672 | dev_min = 2; |
e6ec716f | 9673 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
9674 | /* Multiply by 2 */ |
9675 | min_free <<= 1; | |
e6ec716f | 9676 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 9677 | dev_min = fs_devices->rw_devices; |
47c5713f | 9678 | min_free = div64_u64(min_free, dev_min); |
cdcb725c | 9679 | } |
9680 | ||
6df9a95e JB |
9681 | /* We need to do this so that we can look at pending chunks */ |
9682 | trans = btrfs_join_transaction(root); | |
9683 | if (IS_ERR(trans)) { | |
9684 | ret = PTR_ERR(trans); | |
9685 | goto out; | |
9686 | } | |
9687 | ||
0b246afa | 9688 | mutex_lock(&fs_info->chunk_mutex); |
ba1bf481 | 9689 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { |
7bfc837d | 9690 | u64 dev_offset; |
56bec294 | 9691 | |
ba1bf481 JB |
9692 | /* |
9693 | * check to make sure we can actually find a chunk with enough | |
9694 | * space to fit our block group in. | |
9695 | */ | |
63a212ab | 9696 | if (device->total_bytes > device->bytes_used + min_free && |
401e29c1 | 9697 | !test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { |
6df9a95e | 9698 | ret = find_free_dev_extent(trans, device, min_free, |
7bfc837d | 9699 | &dev_offset, NULL); |
ba1bf481 | 9700 | if (!ret) |
cdcb725c | 9701 | dev_nr++; |
9702 | ||
9703 | if (dev_nr >= dev_min) | |
73e48b27 | 9704 | break; |
cdcb725c | 9705 | |
ba1bf481 | 9706 | ret = -1; |
725c8463 | 9707 | } |
edbd8d4e | 9708 | } |
0305bc27 | 9709 | if (debug && ret == -1) |
0b246afa JM |
9710 | btrfs_warn(fs_info, |
9711 | "no space to allocate a new chunk for block group %llu", | |
9712 | block_group->key.objectid); | |
9713 | mutex_unlock(&fs_info->chunk_mutex); | |
3a45bb20 | 9714 | btrfs_end_transaction(trans); |
edbd8d4e | 9715 | out: |
ba1bf481 | 9716 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
9717 | return ret; |
9718 | } | |
9719 | ||
6bccf3ab JM |
9720 | static int find_first_block_group(struct btrfs_fs_info *fs_info, |
9721 | struct btrfs_path *path, | |
9722 | struct btrfs_key *key) | |
0b86a832 | 9723 | { |
6bccf3ab | 9724 | struct btrfs_root *root = fs_info->extent_root; |
925baedd | 9725 | int ret = 0; |
0b86a832 CM |
9726 | struct btrfs_key found_key; |
9727 | struct extent_buffer *leaf; | |
514c7dca QW |
9728 | struct btrfs_block_group_item bg; |
9729 | u64 flags; | |
0b86a832 | 9730 | int slot; |
edbd8d4e | 9731 | |
0b86a832 CM |
9732 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
9733 | if (ret < 0) | |
925baedd CM |
9734 | goto out; |
9735 | ||
d397712b | 9736 | while (1) { |
0b86a832 | 9737 | slot = path->slots[0]; |
edbd8d4e | 9738 | leaf = path->nodes[0]; |
0b86a832 CM |
9739 | if (slot >= btrfs_header_nritems(leaf)) { |
9740 | ret = btrfs_next_leaf(root, path); | |
9741 | if (ret == 0) | |
9742 | continue; | |
9743 | if (ret < 0) | |
925baedd | 9744 | goto out; |
0b86a832 | 9745 | break; |
edbd8d4e | 9746 | } |
0b86a832 | 9747 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 9748 | |
0b86a832 | 9749 | if (found_key.objectid >= key->objectid && |
925baedd | 9750 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
6fb37b75 LB |
9751 | struct extent_map_tree *em_tree; |
9752 | struct extent_map *em; | |
9753 | ||
9754 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
9755 | read_lock(&em_tree->lock); | |
9756 | em = lookup_extent_mapping(em_tree, found_key.objectid, | |
9757 | found_key.offset); | |
9758 | read_unlock(&em_tree->lock); | |
9759 | if (!em) { | |
0b246afa | 9760 | btrfs_err(fs_info, |
6fb37b75 LB |
9761 | "logical %llu len %llu found bg but no related chunk", |
9762 | found_key.objectid, found_key.offset); | |
9763 | ret = -ENOENT; | |
514c7dca QW |
9764 | } else if (em->start != found_key.objectid || |
9765 | em->len != found_key.offset) { | |
9766 | btrfs_err(fs_info, | |
9767 | "block group %llu len %llu mismatch with chunk %llu len %llu", | |
9768 | found_key.objectid, found_key.offset, | |
9769 | em->start, em->len); | |
9770 | ret = -EUCLEAN; | |
6fb37b75 | 9771 | } else { |
514c7dca QW |
9772 | read_extent_buffer(leaf, &bg, |
9773 | btrfs_item_ptr_offset(leaf, slot), | |
9774 | sizeof(bg)); | |
9775 | flags = btrfs_block_group_flags(&bg) & | |
9776 | BTRFS_BLOCK_GROUP_TYPE_MASK; | |
9777 | ||
9778 | if (flags != (em->map_lookup->type & | |
9779 | BTRFS_BLOCK_GROUP_TYPE_MASK)) { | |
9780 | btrfs_err(fs_info, | |
9781 | "block group %llu len %llu type flags 0x%llx mismatch with chunk type flags 0x%llx", | |
9782 | found_key.objectid, | |
9783 | found_key.offset, flags, | |
9784 | (BTRFS_BLOCK_GROUP_TYPE_MASK & | |
9785 | em->map_lookup->type)); | |
9786 | ret = -EUCLEAN; | |
9787 | } else { | |
9788 | ret = 0; | |
9789 | } | |
6fb37b75 | 9790 | } |
187ee58c | 9791 | free_extent_map(em); |
925baedd CM |
9792 | goto out; |
9793 | } | |
0b86a832 | 9794 | path->slots[0]++; |
edbd8d4e | 9795 | } |
925baedd | 9796 | out: |
0b86a832 | 9797 | return ret; |
edbd8d4e CM |
9798 | } |
9799 | ||
0af3d00b JB |
9800 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
9801 | { | |
9802 | struct btrfs_block_group_cache *block_group; | |
9803 | u64 last = 0; | |
9804 | ||
9805 | while (1) { | |
9806 | struct inode *inode; | |
9807 | ||
9808 | block_group = btrfs_lookup_first_block_group(info, last); | |
9809 | while (block_group) { | |
3aa7c7a3 | 9810 | wait_block_group_cache_done(block_group); |
0af3d00b JB |
9811 | spin_lock(&block_group->lock); |
9812 | if (block_group->iref) | |
9813 | break; | |
9814 | spin_unlock(&block_group->lock); | |
2ff7e61e | 9815 | block_group = next_block_group(info, block_group); |
0af3d00b JB |
9816 | } |
9817 | if (!block_group) { | |
9818 | if (last == 0) | |
9819 | break; | |
9820 | last = 0; | |
9821 | continue; | |
9822 | } | |
9823 | ||
9824 | inode = block_group->inode; | |
9825 | block_group->iref = 0; | |
9826 | block_group->inode = NULL; | |
9827 | spin_unlock(&block_group->lock); | |
f3bca802 | 9828 | ASSERT(block_group->io_ctl.inode == NULL); |
0af3d00b JB |
9829 | iput(inode); |
9830 | last = block_group->key.objectid + block_group->key.offset; | |
9831 | btrfs_put_block_group(block_group); | |
9832 | } | |
9833 | } | |
9834 | ||
5cdd7db6 FM |
9835 | /* |
9836 | * Must be called only after stopping all workers, since we could have block | |
9837 | * group caching kthreads running, and therefore they could race with us if we | |
9838 | * freed the block groups before stopping them. | |
9839 | */ | |
1a40e23b ZY |
9840 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
9841 | { | |
9842 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 9843 | struct btrfs_space_info *space_info; |
11833d66 | 9844 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
9845 | struct rb_node *n; |
9846 | ||
9e351cc8 | 9847 | down_write(&info->commit_root_sem); |
11833d66 YZ |
9848 | while (!list_empty(&info->caching_block_groups)) { |
9849 | caching_ctl = list_entry(info->caching_block_groups.next, | |
9850 | struct btrfs_caching_control, list); | |
9851 | list_del(&caching_ctl->list); | |
9852 | put_caching_control(caching_ctl); | |
9853 | } | |
9e351cc8 | 9854 | up_write(&info->commit_root_sem); |
11833d66 | 9855 | |
47ab2a6c JB |
9856 | spin_lock(&info->unused_bgs_lock); |
9857 | while (!list_empty(&info->unused_bgs)) { | |
9858 | block_group = list_first_entry(&info->unused_bgs, | |
9859 | struct btrfs_block_group_cache, | |
9860 | bg_list); | |
9861 | list_del_init(&block_group->bg_list); | |
9862 | btrfs_put_block_group(block_group); | |
9863 | } | |
9864 | spin_unlock(&info->unused_bgs_lock); | |
9865 | ||
1a40e23b ZY |
9866 | spin_lock(&info->block_group_cache_lock); |
9867 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
9868 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
9869 | cache_node); | |
1a40e23b ZY |
9870 | rb_erase(&block_group->cache_node, |
9871 | &info->block_group_cache_tree); | |
01eacb27 | 9872 | RB_CLEAR_NODE(&block_group->cache_node); |
d899e052 YZ |
9873 | spin_unlock(&info->block_group_cache_lock); |
9874 | ||
80eb234a | 9875 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 9876 | list_del(&block_group->list); |
80eb234a | 9877 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 9878 | |
3c14874a JB |
9879 | /* |
9880 | * We haven't cached this block group, which means we could | |
9881 | * possibly have excluded extents on this block group. | |
9882 | */ | |
36cce922 JB |
9883 | if (block_group->cached == BTRFS_CACHE_NO || |
9884 | block_group->cached == BTRFS_CACHE_ERROR) | |
9e715da8 | 9885 | free_excluded_extents(block_group); |
3c14874a | 9886 | |
817d52f8 | 9887 | btrfs_remove_free_space_cache(block_group); |
5cdd7db6 | 9888 | ASSERT(block_group->cached != BTRFS_CACHE_STARTED); |
f3bca802 LB |
9889 | ASSERT(list_empty(&block_group->dirty_list)); |
9890 | ASSERT(list_empty(&block_group->io_list)); | |
9891 | ASSERT(list_empty(&block_group->bg_list)); | |
9892 | ASSERT(atomic_read(&block_group->count) == 1); | |
11dfe35a | 9893 | btrfs_put_block_group(block_group); |
d899e052 YZ |
9894 | |
9895 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
9896 | } |
9897 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
9898 | |
9899 | /* now that all the block groups are freed, go through and | |
9900 | * free all the space_info structs. This is only called during | |
9901 | * the final stages of unmount, and so we know nobody is | |
9902 | * using them. We call synchronize_rcu() once before we start, | |
9903 | * just to be on the safe side. | |
9904 | */ | |
9905 | synchronize_rcu(); | |
9906 | ||
8929ecfa YZ |
9907 | release_global_block_rsv(info); |
9908 | ||
67871254 | 9909 | while (!list_empty(&info->space_info)) { |
6ab0a202 JM |
9910 | int i; |
9911 | ||
4184ea7f CM |
9912 | space_info = list_entry(info->space_info.next, |
9913 | struct btrfs_space_info, | |
9914 | list); | |
d555b6c3 JB |
9915 | |
9916 | /* | |
9917 | * Do not hide this behind enospc_debug, this is actually | |
9918 | * important and indicates a real bug if this happens. | |
9919 | */ | |
9920 | if (WARN_ON(space_info->bytes_pinned > 0 || | |
b069e0c3 | 9921 | space_info->bytes_reserved > 0 || |
d555b6c3 | 9922 | space_info->bytes_may_use > 0)) |
ab8d0fc4 | 9923 | dump_space_info(info, space_info, 0, 0); |
4184ea7f | 9924 | list_del(&space_info->list); |
6ab0a202 JM |
9925 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
9926 | struct kobject *kobj; | |
c1895442 JM |
9927 | kobj = space_info->block_group_kobjs[i]; |
9928 | space_info->block_group_kobjs[i] = NULL; | |
9929 | if (kobj) { | |
6ab0a202 JM |
9930 | kobject_del(kobj); |
9931 | kobject_put(kobj); | |
9932 | } | |
9933 | } | |
9934 | kobject_del(&space_info->kobj); | |
9935 | kobject_put(&space_info->kobj); | |
4184ea7f | 9936 | } |
1a40e23b ZY |
9937 | return 0; |
9938 | } | |
9939 | ||
75cb379d JM |
9940 | /* link_block_group will queue up kobjects to add when we're reclaim-safe */ |
9941 | void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info) | |
9942 | { | |
9943 | struct btrfs_space_info *space_info; | |
9944 | struct raid_kobject *rkobj; | |
9945 | LIST_HEAD(list); | |
9946 | int index; | |
9947 | int ret = 0; | |
9948 | ||
9949 | spin_lock(&fs_info->pending_raid_kobjs_lock); | |
9950 | list_splice_init(&fs_info->pending_raid_kobjs, &list); | |
9951 | spin_unlock(&fs_info->pending_raid_kobjs_lock); | |
9952 | ||
9953 | list_for_each_entry(rkobj, &list, list) { | |
9954 | space_info = __find_space_info(fs_info, rkobj->flags); | |
9955 | index = btrfs_bg_flags_to_raid_index(rkobj->flags); | |
9956 | ||
9957 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, | |
9958 | "%s", get_raid_name(index)); | |
9959 | if (ret) { | |
9960 | kobject_put(&rkobj->kobj); | |
9961 | break; | |
9962 | } | |
9963 | } | |
9964 | if (ret) | |
9965 | btrfs_warn(fs_info, | |
9966 | "failed to add kobject for block cache, ignoring"); | |
9967 | } | |
9968 | ||
c434d21c | 9969 | static void link_block_group(struct btrfs_block_group_cache *cache) |
b742bb82 | 9970 | { |
c434d21c | 9971 | struct btrfs_space_info *space_info = cache->space_info; |
75cb379d | 9972 | struct btrfs_fs_info *fs_info = cache->fs_info; |
3e72ee88 | 9973 | int index = btrfs_bg_flags_to_raid_index(cache->flags); |
ed55b6ac | 9974 | bool first = false; |
b742bb82 YZ |
9975 | |
9976 | down_write(&space_info->groups_sem); | |
ed55b6ac JM |
9977 | if (list_empty(&space_info->block_groups[index])) |
9978 | first = true; | |
9979 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
9980 | up_write(&space_info->groups_sem); | |
9981 | ||
9982 | if (first) { | |
75cb379d JM |
9983 | struct raid_kobject *rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); |
9984 | if (!rkobj) { | |
9985 | btrfs_warn(cache->fs_info, | |
9986 | "couldn't alloc memory for raid level kobject"); | |
9987 | return; | |
6ab0a202 | 9988 | } |
75cb379d JM |
9989 | rkobj->flags = cache->flags; |
9990 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
9991 | ||
9992 | spin_lock(&fs_info->pending_raid_kobjs_lock); | |
9993 | list_add_tail(&rkobj->list, &fs_info->pending_raid_kobjs); | |
9994 | spin_unlock(&fs_info->pending_raid_kobjs_lock); | |
c1895442 | 9995 | space_info->block_group_kobjs[index] = &rkobj->kobj; |
6ab0a202 | 9996 | } |
b742bb82 YZ |
9997 | } |
9998 | ||
920e4a58 | 9999 | static struct btrfs_block_group_cache * |
2ff7e61e JM |
10000 | btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info, |
10001 | u64 start, u64 size) | |
920e4a58 MX |
10002 | { |
10003 | struct btrfs_block_group_cache *cache; | |
10004 | ||
10005 | cache = kzalloc(sizeof(*cache), GFP_NOFS); | |
10006 | if (!cache) | |
10007 | return NULL; | |
10008 | ||
10009 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), | |
10010 | GFP_NOFS); | |
10011 | if (!cache->free_space_ctl) { | |
10012 | kfree(cache); | |
10013 | return NULL; | |
10014 | } | |
10015 | ||
10016 | cache->key.objectid = start; | |
10017 | cache->key.offset = size; | |
10018 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; | |
10019 | ||
0b246afa | 10020 | cache->fs_info = fs_info; |
e4ff5fb5 | 10021 | cache->full_stripe_len = btrfs_full_stripe_len(fs_info, start); |
1e144fb8 OS |
10022 | set_free_space_tree_thresholds(cache); |
10023 | ||
920e4a58 MX |
10024 | atomic_set(&cache->count, 1); |
10025 | spin_lock_init(&cache->lock); | |
e570fd27 | 10026 | init_rwsem(&cache->data_rwsem); |
920e4a58 MX |
10027 | INIT_LIST_HEAD(&cache->list); |
10028 | INIT_LIST_HEAD(&cache->cluster_list); | |
47ab2a6c | 10029 | INIT_LIST_HEAD(&cache->bg_list); |
633c0aad | 10030 | INIT_LIST_HEAD(&cache->ro_list); |
ce93ec54 | 10031 | INIT_LIST_HEAD(&cache->dirty_list); |
c9dc4c65 | 10032 | INIT_LIST_HEAD(&cache->io_list); |
920e4a58 | 10033 | btrfs_init_free_space_ctl(cache); |
04216820 | 10034 | atomic_set(&cache->trimming, 0); |
a5ed9182 | 10035 | mutex_init(&cache->free_space_lock); |
0966a7b1 | 10036 | btrfs_init_full_stripe_locks_tree(&cache->full_stripe_locks_root); |
920e4a58 MX |
10037 | |
10038 | return cache; | |
10039 | } | |
10040 | ||
7ef49515 QW |
10041 | |
10042 | /* | |
10043 | * Iterate all chunks and verify that each of them has the corresponding block | |
10044 | * group | |
10045 | */ | |
10046 | static int check_chunk_block_group_mappings(struct btrfs_fs_info *fs_info) | |
10047 | { | |
10048 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; | |
10049 | struct extent_map *em; | |
10050 | struct btrfs_block_group_cache *bg; | |
10051 | u64 start = 0; | |
10052 | int ret = 0; | |
10053 | ||
10054 | while (1) { | |
10055 | read_lock(&map_tree->map_tree.lock); | |
10056 | /* | |
10057 | * lookup_extent_mapping will return the first extent map | |
10058 | * intersecting the range, so setting @len to 1 is enough to | |
10059 | * get the first chunk. | |
10060 | */ | |
10061 | em = lookup_extent_mapping(&map_tree->map_tree, start, 1); | |
10062 | read_unlock(&map_tree->map_tree.lock); | |
10063 | if (!em) | |
10064 | break; | |
10065 | ||
10066 | bg = btrfs_lookup_block_group(fs_info, em->start); | |
10067 | if (!bg) { | |
10068 | btrfs_err(fs_info, | |
10069 | "chunk start=%llu len=%llu doesn't have corresponding block group", | |
10070 | em->start, em->len); | |
10071 | ret = -EUCLEAN; | |
10072 | free_extent_map(em); | |
10073 | break; | |
10074 | } | |
10075 | if (bg->key.objectid != em->start || | |
10076 | bg->key.offset != em->len || | |
10077 | (bg->flags & BTRFS_BLOCK_GROUP_TYPE_MASK) != | |
10078 | (em->map_lookup->type & BTRFS_BLOCK_GROUP_TYPE_MASK)) { | |
10079 | btrfs_err(fs_info, | |
10080 | "chunk start=%llu len=%llu flags=0x%llx doesn't match block group start=%llu len=%llu flags=0x%llx", | |
10081 | em->start, em->len, | |
10082 | em->map_lookup->type & BTRFS_BLOCK_GROUP_TYPE_MASK, | |
10083 | bg->key.objectid, bg->key.offset, | |
10084 | bg->flags & BTRFS_BLOCK_GROUP_TYPE_MASK); | |
10085 | ret = -EUCLEAN; | |
10086 | free_extent_map(em); | |
10087 | btrfs_put_block_group(bg); | |
10088 | break; | |
10089 | } | |
10090 | start = em->start + em->len; | |
10091 | free_extent_map(em); | |
10092 | btrfs_put_block_group(bg); | |
10093 | } | |
10094 | return ret; | |
10095 | } | |
10096 | ||
5b4aacef | 10097 | int btrfs_read_block_groups(struct btrfs_fs_info *info) |
9078a3e1 CM |
10098 | { |
10099 | struct btrfs_path *path; | |
10100 | int ret; | |
9078a3e1 | 10101 | struct btrfs_block_group_cache *cache; |
6324fbf3 | 10102 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
10103 | struct btrfs_key key; |
10104 | struct btrfs_key found_key; | |
5f39d397 | 10105 | struct extent_buffer *leaf; |
0af3d00b JB |
10106 | int need_clear = 0; |
10107 | u64 cache_gen; | |
49303381 LB |
10108 | u64 feature; |
10109 | int mixed; | |
10110 | ||
10111 | feature = btrfs_super_incompat_flags(info->super_copy); | |
10112 | mixed = !!(feature & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS); | |
96b5179d | 10113 | |
9078a3e1 | 10114 | key.objectid = 0; |
0b86a832 | 10115 | key.offset = 0; |
962a298f | 10116 | key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
9078a3e1 CM |
10117 | path = btrfs_alloc_path(); |
10118 | if (!path) | |
10119 | return -ENOMEM; | |
e4058b54 | 10120 | path->reada = READA_FORWARD; |
9078a3e1 | 10121 | |
0b246afa JM |
10122 | cache_gen = btrfs_super_cache_generation(info->super_copy); |
10123 | if (btrfs_test_opt(info, SPACE_CACHE) && | |
10124 | btrfs_super_generation(info->super_copy) != cache_gen) | |
0af3d00b | 10125 | need_clear = 1; |
0b246afa | 10126 | if (btrfs_test_opt(info, CLEAR_CACHE)) |
88c2ba3b | 10127 | need_clear = 1; |
0af3d00b | 10128 | |
d397712b | 10129 | while (1) { |
6bccf3ab | 10130 | ret = find_first_block_group(info, path, &key); |
b742bb82 YZ |
10131 | if (ret > 0) |
10132 | break; | |
0b86a832 CM |
10133 | if (ret != 0) |
10134 | goto error; | |
920e4a58 | 10135 | |
5f39d397 CM |
10136 | leaf = path->nodes[0]; |
10137 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
920e4a58 | 10138 | |
2ff7e61e | 10139 | cache = btrfs_create_block_group_cache(info, found_key.objectid, |
920e4a58 | 10140 | found_key.offset); |
9078a3e1 | 10141 | if (!cache) { |
0b86a832 | 10142 | ret = -ENOMEM; |
f0486c68 | 10143 | goto error; |
9078a3e1 | 10144 | } |
96303081 | 10145 | |
cf7c1ef6 LB |
10146 | if (need_clear) { |
10147 | /* | |
10148 | * When we mount with old space cache, we need to | |
10149 | * set BTRFS_DC_CLEAR and set dirty flag. | |
10150 | * | |
10151 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
10152 | * truncate the old free space cache inode and | |
10153 | * setup a new one. | |
10154 | * b) Setting 'dirty flag' makes sure that we flush | |
10155 | * the new space cache info onto disk. | |
10156 | */ | |
0b246afa | 10157 | if (btrfs_test_opt(info, SPACE_CACHE)) |
ce93ec54 | 10158 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 | 10159 | } |
0af3d00b | 10160 | |
5f39d397 CM |
10161 | read_extent_buffer(leaf, &cache->item, |
10162 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
10163 | sizeof(cache->item)); | |
920e4a58 | 10164 | cache->flags = btrfs_block_group_flags(&cache->item); |
49303381 LB |
10165 | if (!mixed && |
10166 | ((cache->flags & BTRFS_BLOCK_GROUP_METADATA) && | |
10167 | (cache->flags & BTRFS_BLOCK_GROUP_DATA))) { | |
10168 | btrfs_err(info, | |
10169 | "bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups", | |
10170 | cache->key.objectid); | |
10171 | ret = -EINVAL; | |
10172 | goto error; | |
10173 | } | |
0b86a832 | 10174 | |
9078a3e1 | 10175 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 10176 | btrfs_release_path(path); |
34d52cb6 | 10177 | |
3c14874a JB |
10178 | /* |
10179 | * We need to exclude the super stripes now so that the space | |
10180 | * info has super bytes accounted for, otherwise we'll think | |
10181 | * we have more space than we actually do. | |
10182 | */ | |
3c4da657 | 10183 | ret = exclude_super_stripes(cache); |
835d974f JB |
10184 | if (ret) { |
10185 | /* | |
10186 | * We may have excluded something, so call this just in | |
10187 | * case. | |
10188 | */ | |
9e715da8 | 10189 | free_excluded_extents(cache); |
920e4a58 | 10190 | btrfs_put_block_group(cache); |
835d974f JB |
10191 | goto error; |
10192 | } | |
3c14874a | 10193 | |
817d52f8 JB |
10194 | /* |
10195 | * check for two cases, either we are full, and therefore | |
10196 | * don't need to bother with the caching work since we won't | |
10197 | * find any space, or we are empty, and we can just add all | |
10198 | * the space in and be done with it. This saves us _alot_ of | |
10199 | * time, particularly in the full case. | |
10200 | */ | |
10201 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 10202 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 10203 | cache->cached = BTRFS_CACHE_FINISHED; |
9e715da8 | 10204 | free_excluded_extents(cache); |
817d52f8 | 10205 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 10206 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 10207 | cache->cached = BTRFS_CACHE_FINISHED; |
4457c1c7 | 10208 | add_new_free_space(cache, found_key.objectid, |
817d52f8 JB |
10209 | found_key.objectid + |
10210 | found_key.offset); | |
9e715da8 | 10211 | free_excluded_extents(cache); |
817d52f8 | 10212 | } |
96b5179d | 10213 | |
0b246afa | 10214 | ret = btrfs_add_block_group_cache(info, cache); |
8c579fe7 JB |
10215 | if (ret) { |
10216 | btrfs_remove_free_space_cache(cache); | |
10217 | btrfs_put_block_group(cache); | |
10218 | goto error; | |
10219 | } | |
10220 | ||
0b246afa | 10221 | trace_btrfs_add_block_group(info, cache, 0); |
d2006e6d NB |
10222 | update_space_info(info, cache->flags, found_key.offset, |
10223 | btrfs_block_group_used(&cache->item), | |
10224 | cache->bytes_super, &space_info); | |
8c579fe7 | 10225 | |
6324fbf3 | 10226 | cache->space_info = space_info; |
1b2da372 | 10227 | |
c434d21c | 10228 | link_block_group(cache); |
0f9dd46c | 10229 | |
0b246afa | 10230 | set_avail_alloc_bits(info, cache->flags); |
2ff7e61e | 10231 | if (btrfs_chunk_readonly(info, cache->key.objectid)) { |
868f401a | 10232 | inc_block_group_ro(cache, 1); |
47ab2a6c | 10233 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
031f24da QW |
10234 | ASSERT(list_empty(&cache->bg_list)); |
10235 | btrfs_mark_bg_unused(cache); | |
47ab2a6c | 10236 | } |
9078a3e1 | 10237 | } |
b742bb82 | 10238 | |
0b246afa | 10239 | list_for_each_entry_rcu(space_info, &info->space_info, list) { |
2ff7e61e | 10240 | if (!(get_alloc_profile(info, space_info->flags) & |
b742bb82 YZ |
10241 | (BTRFS_BLOCK_GROUP_RAID10 | |
10242 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
10243 | BTRFS_BLOCK_GROUP_RAID5 | |
10244 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
10245 | BTRFS_BLOCK_GROUP_DUP))) |
10246 | continue; | |
10247 | /* | |
10248 | * avoid allocating from un-mirrored block group if there are | |
10249 | * mirrored block groups. | |
10250 | */ | |
1095cc0d | 10251 | list_for_each_entry(cache, |
10252 | &space_info->block_groups[BTRFS_RAID_RAID0], | |
10253 | list) | |
868f401a | 10254 | inc_block_group_ro(cache, 1); |
1095cc0d | 10255 | list_for_each_entry(cache, |
10256 | &space_info->block_groups[BTRFS_RAID_SINGLE], | |
10257 | list) | |
868f401a | 10258 | inc_block_group_ro(cache, 1); |
9078a3e1 | 10259 | } |
f0486c68 | 10260 | |
75cb379d | 10261 | btrfs_add_raid_kobjects(info); |
f0486c68 | 10262 | init_global_block_rsv(info); |
7ef49515 | 10263 | ret = check_chunk_block_group_mappings(info); |
0b86a832 | 10264 | error: |
9078a3e1 | 10265 | btrfs_free_path(path); |
0b86a832 | 10266 | return ret; |
9078a3e1 | 10267 | } |
6324fbf3 | 10268 | |
6c686b35 | 10269 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans) |
ea658bad | 10270 | { |
6c686b35 | 10271 | struct btrfs_fs_info *fs_info = trans->fs_info; |
545e3366 | 10272 | struct btrfs_block_group_cache *block_group; |
0b246afa | 10273 | struct btrfs_root *extent_root = fs_info->extent_root; |
ea658bad JB |
10274 | struct btrfs_block_group_item item; |
10275 | struct btrfs_key key; | |
10276 | int ret = 0; | |
10277 | ||
5ce55557 FM |
10278 | if (!trans->can_flush_pending_bgs) |
10279 | return; | |
10280 | ||
545e3366 JB |
10281 | while (!list_empty(&trans->new_bgs)) { |
10282 | block_group = list_first_entry(&trans->new_bgs, | |
10283 | struct btrfs_block_group_cache, | |
10284 | bg_list); | |
ea658bad | 10285 | if (ret) |
c92f6be3 | 10286 | goto next; |
ea658bad JB |
10287 | |
10288 | spin_lock(&block_group->lock); | |
10289 | memcpy(&item, &block_group->item, sizeof(item)); | |
10290 | memcpy(&key, &block_group->key, sizeof(key)); | |
10291 | spin_unlock(&block_group->lock); | |
10292 | ||
10293 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
10294 | sizeof(item)); | |
10295 | if (ret) | |
66642832 | 10296 | btrfs_abort_transaction(trans, ret); |
97aff912 | 10297 | ret = btrfs_finish_chunk_alloc(trans, key.objectid, key.offset); |
6df9a95e | 10298 | if (ret) |
66642832 | 10299 | btrfs_abort_transaction(trans, ret); |
e4e0711c | 10300 | add_block_group_free_space(trans, block_group); |
1e144fb8 | 10301 | /* already aborted the transaction if it failed. */ |
c92f6be3 FM |
10302 | next: |
10303 | list_del_init(&block_group->bg_list); | |
ea658bad | 10304 | } |
5ce55557 | 10305 | btrfs_trans_release_chunk_metadata(trans); |
ea658bad JB |
10306 | } |
10307 | ||
e7e02096 | 10308 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, u64 bytes_used, |
0174484d | 10309 | u64 type, u64 chunk_offset, u64 size) |
6324fbf3 | 10310 | { |
e7e02096 | 10311 | struct btrfs_fs_info *fs_info = trans->fs_info; |
6324fbf3 | 10312 | struct btrfs_block_group_cache *cache; |
0b246afa | 10313 | int ret; |
6324fbf3 | 10314 | |
0b246afa | 10315 | btrfs_set_log_full_commit(fs_info, trans); |
e02119d5 | 10316 | |
2ff7e61e | 10317 | cache = btrfs_create_block_group_cache(fs_info, chunk_offset, size); |
0f9dd46c JB |
10318 | if (!cache) |
10319 | return -ENOMEM; | |
34d52cb6 | 10320 | |
6324fbf3 | 10321 | btrfs_set_block_group_used(&cache->item, bytes_used); |
0174484d NB |
10322 | btrfs_set_block_group_chunk_objectid(&cache->item, |
10323 | BTRFS_FIRST_CHUNK_TREE_OBJECTID); | |
6324fbf3 CM |
10324 | btrfs_set_block_group_flags(&cache->item, type); |
10325 | ||
920e4a58 | 10326 | cache->flags = type; |
11833d66 | 10327 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 10328 | cache->cached = BTRFS_CACHE_FINISHED; |
1e144fb8 | 10329 | cache->needs_free_space = 1; |
3c4da657 | 10330 | ret = exclude_super_stripes(cache); |
835d974f JB |
10331 | if (ret) { |
10332 | /* | |
10333 | * We may have excluded something, so call this just in | |
10334 | * case. | |
10335 | */ | |
9e715da8 | 10336 | free_excluded_extents(cache); |
920e4a58 | 10337 | btrfs_put_block_group(cache); |
835d974f JB |
10338 | return ret; |
10339 | } | |
96303081 | 10340 | |
4457c1c7 | 10341 | add_new_free_space(cache, chunk_offset, chunk_offset + size); |
817d52f8 | 10342 | |
9e715da8 | 10343 | free_excluded_extents(cache); |
11833d66 | 10344 | |
d0bd4560 | 10345 | #ifdef CONFIG_BTRFS_DEBUG |
2ff7e61e | 10346 | if (btrfs_should_fragment_free_space(cache)) { |
d0bd4560 JB |
10347 | u64 new_bytes_used = size - bytes_used; |
10348 | ||
10349 | bytes_used += new_bytes_used >> 1; | |
2ff7e61e | 10350 | fragment_free_space(cache); |
d0bd4560 JB |
10351 | } |
10352 | #endif | |
2e6e5183 | 10353 | /* |
2be12ef7 NB |
10354 | * Ensure the corresponding space_info object is created and |
10355 | * assigned to our block group. We want our bg to be added to the rbtree | |
10356 | * with its ->space_info set. | |
2e6e5183 | 10357 | */ |
2be12ef7 | 10358 | cache->space_info = __find_space_info(fs_info, cache->flags); |
dc2d3005 | 10359 | ASSERT(cache->space_info); |
2e6e5183 | 10360 | |
0b246afa | 10361 | ret = btrfs_add_block_group_cache(fs_info, cache); |
8c579fe7 JB |
10362 | if (ret) { |
10363 | btrfs_remove_free_space_cache(cache); | |
10364 | btrfs_put_block_group(cache); | |
10365 | return ret; | |
10366 | } | |
10367 | ||
2e6e5183 FM |
10368 | /* |
10369 | * Now that our block group has its ->space_info set and is inserted in | |
10370 | * the rbtree, update the space info's counters. | |
10371 | */ | |
0b246afa | 10372 | trace_btrfs_add_block_group(fs_info, cache, 1); |
d2006e6d | 10373 | update_space_info(fs_info, cache->flags, size, bytes_used, |
e40edf2d | 10374 | cache->bytes_super, &cache->space_info); |
0b246afa | 10375 | update_global_block_rsv(fs_info); |
1b2da372 | 10376 | |
c434d21c | 10377 | link_block_group(cache); |
6324fbf3 | 10378 | |
47ab2a6c | 10379 | list_add_tail(&cache->bg_list, &trans->new_bgs); |
6324fbf3 | 10380 | |
0b246afa | 10381 | set_avail_alloc_bits(fs_info, type); |
6324fbf3 CM |
10382 | return 0; |
10383 | } | |
1a40e23b | 10384 | |
10ea00f5 ID |
10385 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
10386 | { | |
899c81ea ID |
10387 | u64 extra_flags = chunk_to_extended(flags) & |
10388 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 10389 | |
de98ced9 | 10390 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
10391 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
10392 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
10393 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
10394 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
10395 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
10396 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 10397 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
10398 | } |
10399 | ||
1a40e23b | 10400 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
5a98ec01 | 10401 | u64 group_start, struct extent_map *em) |
1a40e23b | 10402 | { |
5a98ec01 | 10403 | struct btrfs_fs_info *fs_info = trans->fs_info; |
6bccf3ab | 10404 | struct btrfs_root *root = fs_info->extent_root; |
1a40e23b ZY |
10405 | struct btrfs_path *path; |
10406 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 10407 | struct btrfs_free_cluster *cluster; |
0b246afa | 10408 | struct btrfs_root *tree_root = fs_info->tree_root; |
1a40e23b | 10409 | struct btrfs_key key; |
0af3d00b | 10410 | struct inode *inode; |
c1895442 | 10411 | struct kobject *kobj = NULL; |
1a40e23b | 10412 | int ret; |
10ea00f5 | 10413 | int index; |
89a55897 | 10414 | int factor; |
4f69cb98 | 10415 | struct btrfs_caching_control *caching_ctl = NULL; |
04216820 | 10416 | bool remove_em; |
1a40e23b | 10417 | |
6bccf3ab | 10418 | block_group = btrfs_lookup_block_group(fs_info, group_start); |
1a40e23b | 10419 | BUG_ON(!block_group); |
c146afad | 10420 | BUG_ON(!block_group->ro); |
1a40e23b | 10421 | |
4ed0a7a3 | 10422 | trace_btrfs_remove_block_group(block_group); |
9f7c43c9 | 10423 | /* |
10424 | * Free the reserved super bytes from this block group before | |
10425 | * remove it. | |
10426 | */ | |
9e715da8 | 10427 | free_excluded_extents(block_group); |
fd708b81 JB |
10428 | btrfs_free_ref_tree_range(fs_info, block_group->key.objectid, |
10429 | block_group->key.offset); | |
9f7c43c9 | 10430 | |
1a40e23b | 10431 | memcpy(&key, &block_group->key, sizeof(key)); |
3e72ee88 | 10432 | index = btrfs_bg_flags_to_raid_index(block_group->flags); |
46df06b8 | 10433 | factor = btrfs_bg_type_to_factor(block_group->flags); |
1a40e23b | 10434 | |
44fb5511 | 10435 | /* make sure this block group isn't part of an allocation cluster */ |
0b246afa | 10436 | cluster = &fs_info->data_alloc_cluster; |
44fb5511 CM |
10437 | spin_lock(&cluster->refill_lock); |
10438 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
10439 | spin_unlock(&cluster->refill_lock); | |
10440 | ||
10441 | /* | |
10442 | * make sure this block group isn't part of a metadata | |
10443 | * allocation cluster | |
10444 | */ | |
0b246afa | 10445 | cluster = &fs_info->meta_alloc_cluster; |
44fb5511 CM |
10446 | spin_lock(&cluster->refill_lock); |
10447 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
10448 | spin_unlock(&cluster->refill_lock); | |
10449 | ||
1a40e23b | 10450 | path = btrfs_alloc_path(); |
d8926bb3 MF |
10451 | if (!path) { |
10452 | ret = -ENOMEM; | |
10453 | goto out; | |
10454 | } | |
1a40e23b | 10455 | |
1bbc621e CM |
10456 | /* |
10457 | * get the inode first so any iput calls done for the io_list | |
10458 | * aren't the final iput (no unlinks allowed now) | |
10459 | */ | |
77ab86bf | 10460 | inode = lookup_free_space_inode(fs_info, block_group, path); |
1bbc621e CM |
10461 | |
10462 | mutex_lock(&trans->transaction->cache_write_mutex); | |
10463 | /* | |
10464 | * make sure our free spache cache IO is done before remove the | |
10465 | * free space inode | |
10466 | */ | |
10467 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
10468 | if (!list_empty(&block_group->io_list)) { | |
10469 | list_del_init(&block_group->io_list); | |
10470 | ||
10471 | WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode); | |
10472 | ||
10473 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
afdb5718 | 10474 | btrfs_wait_cache_io(trans, block_group, path); |
1bbc621e CM |
10475 | btrfs_put_block_group(block_group); |
10476 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
10477 | } | |
10478 | ||
10479 | if (!list_empty(&block_group->dirty_list)) { | |
10480 | list_del_init(&block_group->dirty_list); | |
10481 | btrfs_put_block_group(block_group); | |
10482 | } | |
10483 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
10484 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
10485 | ||
0af3d00b | 10486 | if (!IS_ERR(inode)) { |
73f2e545 | 10487 | ret = btrfs_orphan_add(trans, BTRFS_I(inode)); |
79787eaa JM |
10488 | if (ret) { |
10489 | btrfs_add_delayed_iput(inode); | |
10490 | goto out; | |
10491 | } | |
0af3d00b JB |
10492 | clear_nlink(inode); |
10493 | /* One for the block groups ref */ | |
10494 | spin_lock(&block_group->lock); | |
10495 | if (block_group->iref) { | |
10496 | block_group->iref = 0; | |
10497 | block_group->inode = NULL; | |
10498 | spin_unlock(&block_group->lock); | |
10499 | iput(inode); | |
10500 | } else { | |
10501 | spin_unlock(&block_group->lock); | |
10502 | } | |
10503 | /* One for our lookup ref */ | |
455757c3 | 10504 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
10505 | } |
10506 | ||
10507 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
10508 | key.offset = block_group->key.objectid; | |
10509 | key.type = 0; | |
10510 | ||
10511 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
10512 | if (ret < 0) | |
10513 | goto out; | |
10514 | if (ret > 0) | |
b3b4aa74 | 10515 | btrfs_release_path(path); |
0af3d00b JB |
10516 | if (ret == 0) { |
10517 | ret = btrfs_del_item(trans, tree_root, path); | |
10518 | if (ret) | |
10519 | goto out; | |
b3b4aa74 | 10520 | btrfs_release_path(path); |
0af3d00b JB |
10521 | } |
10522 | ||
0b246afa | 10523 | spin_lock(&fs_info->block_group_cache_lock); |
1a40e23b | 10524 | rb_erase(&block_group->cache_node, |
0b246afa | 10525 | &fs_info->block_group_cache_tree); |
292cbd51 | 10526 | RB_CLEAR_NODE(&block_group->cache_node); |
a1897fdd | 10527 | |
0b246afa JM |
10528 | if (fs_info->first_logical_byte == block_group->key.objectid) |
10529 | fs_info->first_logical_byte = (u64)-1; | |
10530 | spin_unlock(&fs_info->block_group_cache_lock); | |
817d52f8 | 10531 | |
80eb234a | 10532 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
10533 | /* |
10534 | * we must use list_del_init so people can check to see if they | |
10535 | * are still on the list after taking the semaphore | |
10536 | */ | |
10537 | list_del_init(&block_group->list); | |
6ab0a202 | 10538 | if (list_empty(&block_group->space_info->block_groups[index])) { |
c1895442 JM |
10539 | kobj = block_group->space_info->block_group_kobjs[index]; |
10540 | block_group->space_info->block_group_kobjs[index] = NULL; | |
0b246afa | 10541 | clear_avail_alloc_bits(fs_info, block_group->flags); |
6ab0a202 | 10542 | } |
80eb234a | 10543 | up_write(&block_group->space_info->groups_sem); |
c1895442 JM |
10544 | if (kobj) { |
10545 | kobject_del(kobj); | |
10546 | kobject_put(kobj); | |
10547 | } | |
1a40e23b | 10548 | |
4f69cb98 FM |
10549 | if (block_group->has_caching_ctl) |
10550 | caching_ctl = get_caching_control(block_group); | |
817d52f8 | 10551 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 10552 | wait_block_group_cache_done(block_group); |
4f69cb98 | 10553 | if (block_group->has_caching_ctl) { |
0b246afa | 10554 | down_write(&fs_info->commit_root_sem); |
4f69cb98 FM |
10555 | if (!caching_ctl) { |
10556 | struct btrfs_caching_control *ctl; | |
10557 | ||
10558 | list_for_each_entry(ctl, | |
0b246afa | 10559 | &fs_info->caching_block_groups, list) |
4f69cb98 FM |
10560 | if (ctl->block_group == block_group) { |
10561 | caching_ctl = ctl; | |
1e4f4714 | 10562 | refcount_inc(&caching_ctl->count); |
4f69cb98 FM |
10563 | break; |
10564 | } | |
10565 | } | |
10566 | if (caching_ctl) | |
10567 | list_del_init(&caching_ctl->list); | |
0b246afa | 10568 | up_write(&fs_info->commit_root_sem); |
4f69cb98 FM |
10569 | if (caching_ctl) { |
10570 | /* Once for the caching bgs list and once for us. */ | |
10571 | put_caching_control(caching_ctl); | |
10572 | put_caching_control(caching_ctl); | |
10573 | } | |
10574 | } | |
817d52f8 | 10575 | |
ce93ec54 JB |
10576 | spin_lock(&trans->transaction->dirty_bgs_lock); |
10577 | if (!list_empty(&block_group->dirty_list)) { | |
1bbc621e CM |
10578 | WARN_ON(1); |
10579 | } | |
10580 | if (!list_empty(&block_group->io_list)) { | |
10581 | WARN_ON(1); | |
ce93ec54 JB |
10582 | } |
10583 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
817d52f8 JB |
10584 | btrfs_remove_free_space_cache(block_group); |
10585 | ||
c146afad | 10586 | spin_lock(&block_group->space_info->lock); |
75c68e9f | 10587 | list_del_init(&block_group->ro_list); |
18d018ad | 10588 | |
0b246afa | 10589 | if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
18d018ad ZL |
10590 | WARN_ON(block_group->space_info->total_bytes |
10591 | < block_group->key.offset); | |
10592 | WARN_ON(block_group->space_info->bytes_readonly | |
10593 | < block_group->key.offset); | |
10594 | WARN_ON(block_group->space_info->disk_total | |
10595 | < block_group->key.offset * factor); | |
10596 | } | |
c146afad YZ |
10597 | block_group->space_info->total_bytes -= block_group->key.offset; |
10598 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 10599 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
18d018ad | 10600 | |
c146afad | 10601 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 10602 | |
0af3d00b JB |
10603 | memcpy(&key, &block_group->key, sizeof(key)); |
10604 | ||
34441361 | 10605 | mutex_lock(&fs_info->chunk_mutex); |
495e64f4 FM |
10606 | if (!list_empty(&em->list)) { |
10607 | /* We're in the transaction->pending_chunks list. */ | |
10608 | free_extent_map(em); | |
10609 | } | |
04216820 FM |
10610 | spin_lock(&block_group->lock); |
10611 | block_group->removed = 1; | |
10612 | /* | |
10613 | * At this point trimming can't start on this block group, because we | |
10614 | * removed the block group from the tree fs_info->block_group_cache_tree | |
10615 | * so no one can't find it anymore and even if someone already got this | |
10616 | * block group before we removed it from the rbtree, they have already | |
10617 | * incremented block_group->trimming - if they didn't, they won't find | |
10618 | * any free space entries because we already removed them all when we | |
10619 | * called btrfs_remove_free_space_cache(). | |
10620 | * | |
10621 | * And we must not remove the extent map from the fs_info->mapping_tree | |
10622 | * to prevent the same logical address range and physical device space | |
10623 | * ranges from being reused for a new block group. This is because our | |
10624 | * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is | |
10625 | * completely transactionless, so while it is trimming a range the | |
10626 | * currently running transaction might finish and a new one start, | |
10627 | * allowing for new block groups to be created that can reuse the same | |
10628 | * physical device locations unless we take this special care. | |
e33e17ee JM |
10629 | * |
10630 | * There may also be an implicit trim operation if the file system | |
10631 | * is mounted with -odiscard. The same protections must remain | |
10632 | * in place until the extents have been discarded completely when | |
10633 | * the transaction commit has completed. | |
04216820 FM |
10634 | */ |
10635 | remove_em = (atomic_read(&block_group->trimming) == 0); | |
10636 | /* | |
10637 | * Make sure a trimmer task always sees the em in the pinned_chunks list | |
10638 | * if it sees block_group->removed == 1 (needs to lock block_group->lock | |
10639 | * before checking block_group->removed). | |
10640 | */ | |
10641 | if (!remove_em) { | |
10642 | /* | |
10643 | * Our em might be in trans->transaction->pending_chunks which | |
10644 | * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks), | |
10645 | * and so is the fs_info->pinned_chunks list. | |
10646 | * | |
10647 | * So at this point we must be holding the chunk_mutex to avoid | |
10648 | * any races with chunk allocation (more specifically at | |
10649 | * volumes.c:contains_pending_extent()), to ensure it always | |
10650 | * sees the em, either in the pending_chunks list or in the | |
10651 | * pinned_chunks list. | |
10652 | */ | |
0b246afa | 10653 | list_move_tail(&em->list, &fs_info->pinned_chunks); |
04216820 FM |
10654 | } |
10655 | spin_unlock(&block_group->lock); | |
04216820 FM |
10656 | |
10657 | if (remove_em) { | |
10658 | struct extent_map_tree *em_tree; | |
10659 | ||
0b246afa | 10660 | em_tree = &fs_info->mapping_tree.map_tree; |
04216820 | 10661 | write_lock(&em_tree->lock); |
8dbcd10f FM |
10662 | /* |
10663 | * The em might be in the pending_chunks list, so make sure the | |
10664 | * chunk mutex is locked, since remove_extent_mapping() will | |
10665 | * delete us from that list. | |
10666 | */ | |
04216820 FM |
10667 | remove_extent_mapping(em_tree, em); |
10668 | write_unlock(&em_tree->lock); | |
10669 | /* once for the tree */ | |
10670 | free_extent_map(em); | |
10671 | } | |
10672 | ||
34441361 | 10673 | mutex_unlock(&fs_info->chunk_mutex); |
8dbcd10f | 10674 | |
f3f72779 | 10675 | ret = remove_block_group_free_space(trans, block_group); |
1e144fb8 OS |
10676 | if (ret) |
10677 | goto out; | |
10678 | ||
fa9c0d79 CM |
10679 | btrfs_put_block_group(block_group); |
10680 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
10681 | |
10682 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
10683 | if (ret > 0) | |
10684 | ret = -EIO; | |
10685 | if (ret < 0) | |
10686 | goto out; | |
10687 | ||
10688 | ret = btrfs_del_item(trans, root, path); | |
10689 | out: | |
10690 | btrfs_free_path(path); | |
10691 | return ret; | |
10692 | } | |
acce952b | 10693 | |
8eab77ff | 10694 | struct btrfs_trans_handle * |
7fd01182 FM |
10695 | btrfs_start_trans_remove_block_group(struct btrfs_fs_info *fs_info, |
10696 | const u64 chunk_offset) | |
8eab77ff | 10697 | { |
7fd01182 FM |
10698 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; |
10699 | struct extent_map *em; | |
10700 | struct map_lookup *map; | |
10701 | unsigned int num_items; | |
10702 | ||
10703 | read_lock(&em_tree->lock); | |
10704 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); | |
10705 | read_unlock(&em_tree->lock); | |
10706 | ASSERT(em && em->start == chunk_offset); | |
10707 | ||
8eab77ff | 10708 | /* |
7fd01182 FM |
10709 | * We need to reserve 3 + N units from the metadata space info in order |
10710 | * to remove a block group (done at btrfs_remove_chunk() and at | |
10711 | * btrfs_remove_block_group()), which are used for: | |
10712 | * | |
8eab77ff FM |
10713 | * 1 unit for adding the free space inode's orphan (located in the tree |
10714 | * of tree roots). | |
7fd01182 FM |
10715 | * 1 unit for deleting the block group item (located in the extent |
10716 | * tree). | |
10717 | * 1 unit for deleting the free space item (located in tree of tree | |
10718 | * roots). | |
10719 | * N units for deleting N device extent items corresponding to each | |
10720 | * stripe (located in the device tree). | |
10721 | * | |
10722 | * In order to remove a block group we also need to reserve units in the | |
10723 | * system space info in order to update the chunk tree (update one or | |
10724 | * more device items and remove one chunk item), but this is done at | |
10725 | * btrfs_remove_chunk() through a call to check_system_chunk(). | |
8eab77ff | 10726 | */ |
95617d69 | 10727 | map = em->map_lookup; |
7fd01182 FM |
10728 | num_items = 3 + map->num_stripes; |
10729 | free_extent_map(em); | |
10730 | ||
8eab77ff | 10731 | return btrfs_start_transaction_fallback_global_rsv(fs_info->extent_root, |
7fd01182 | 10732 | num_items, 1); |
8eab77ff FM |
10733 | } |
10734 | ||
47ab2a6c JB |
10735 | /* |
10736 | * Process the unused_bgs list and remove any that don't have any allocated | |
10737 | * space inside of them. | |
10738 | */ | |
10739 | void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) | |
10740 | { | |
10741 | struct btrfs_block_group_cache *block_group; | |
10742 | struct btrfs_space_info *space_info; | |
47ab2a6c JB |
10743 | struct btrfs_trans_handle *trans; |
10744 | int ret = 0; | |
10745 | ||
afcdd129 | 10746 | if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags)) |
47ab2a6c JB |
10747 | return; |
10748 | ||
10749 | spin_lock(&fs_info->unused_bgs_lock); | |
10750 | while (!list_empty(&fs_info->unused_bgs)) { | |
10751 | u64 start, end; | |
e33e17ee | 10752 | int trimming; |
47ab2a6c JB |
10753 | |
10754 | block_group = list_first_entry(&fs_info->unused_bgs, | |
10755 | struct btrfs_block_group_cache, | |
10756 | bg_list); | |
47ab2a6c | 10757 | list_del_init(&block_group->bg_list); |
aefbe9a6 ZL |
10758 | |
10759 | space_info = block_group->space_info; | |
10760 | ||
47ab2a6c JB |
10761 | if (ret || btrfs_mixed_space_info(space_info)) { |
10762 | btrfs_put_block_group(block_group); | |
10763 | continue; | |
10764 | } | |
10765 | spin_unlock(&fs_info->unused_bgs_lock); | |
10766 | ||
d5f2e33b | 10767 | mutex_lock(&fs_info->delete_unused_bgs_mutex); |
67c5e7d4 | 10768 | |
47ab2a6c JB |
10769 | /* Don't want to race with allocators so take the groups_sem */ |
10770 | down_write(&space_info->groups_sem); | |
10771 | spin_lock(&block_group->lock); | |
43794446 | 10772 | if (block_group->reserved || block_group->pinned || |
47ab2a6c | 10773 | btrfs_block_group_used(&block_group->item) || |
19c4d2f9 | 10774 | block_group->ro || |
aefbe9a6 | 10775 | list_is_singular(&block_group->list)) { |
47ab2a6c JB |
10776 | /* |
10777 | * We want to bail if we made new allocations or have | |
10778 | * outstanding allocations in this block group. We do | |
10779 | * the ro check in case balance is currently acting on | |
10780 | * this block group. | |
10781 | */ | |
4ed0a7a3 | 10782 | trace_btrfs_skip_unused_block_group(block_group); |
47ab2a6c JB |
10783 | spin_unlock(&block_group->lock); |
10784 | up_write(&space_info->groups_sem); | |
10785 | goto next; | |
10786 | } | |
10787 | spin_unlock(&block_group->lock); | |
10788 | ||
10789 | /* We don't want to force the issue, only flip if it's ok. */ | |
868f401a | 10790 | ret = inc_block_group_ro(block_group, 0); |
47ab2a6c JB |
10791 | up_write(&space_info->groups_sem); |
10792 | if (ret < 0) { | |
10793 | ret = 0; | |
10794 | goto next; | |
10795 | } | |
10796 | ||
10797 | /* | |
10798 | * Want to do this before we do anything else so we can recover | |
10799 | * properly if we fail to join the transaction. | |
10800 | */ | |
7fd01182 FM |
10801 | trans = btrfs_start_trans_remove_block_group(fs_info, |
10802 | block_group->key.objectid); | |
47ab2a6c | 10803 | if (IS_ERR(trans)) { |
2ff7e61e | 10804 | btrfs_dec_block_group_ro(block_group); |
47ab2a6c JB |
10805 | ret = PTR_ERR(trans); |
10806 | goto next; | |
10807 | } | |
10808 | ||
10809 | /* | |
10810 | * We could have pending pinned extents for this block group, | |
10811 | * just delete them, we don't care about them anymore. | |
10812 | */ | |
10813 | start = block_group->key.objectid; | |
10814 | end = start + block_group->key.offset - 1; | |
d4b450cd FM |
10815 | /* |
10816 | * Hold the unused_bg_unpin_mutex lock to avoid racing with | |
10817 | * btrfs_finish_extent_commit(). If we are at transaction N, | |
10818 | * another task might be running finish_extent_commit() for the | |
10819 | * previous transaction N - 1, and have seen a range belonging | |
10820 | * to the block group in freed_extents[] before we were able to | |
10821 | * clear the whole block group range from freed_extents[]. This | |
10822 | * means that task can lookup for the block group after we | |
10823 | * unpinned it from freed_extents[] and removed it, leading to | |
10824 | * a BUG_ON() at btrfs_unpin_extent_range(). | |
10825 | */ | |
10826 | mutex_lock(&fs_info->unused_bg_unpin_mutex); | |
758eb51e | 10827 | ret = clear_extent_bits(&fs_info->freed_extents[0], start, end, |
91166212 | 10828 | EXTENT_DIRTY); |
758eb51e | 10829 | if (ret) { |
d4b450cd | 10830 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
2ff7e61e | 10831 | btrfs_dec_block_group_ro(block_group); |
758eb51e FM |
10832 | goto end_trans; |
10833 | } | |
10834 | ret = clear_extent_bits(&fs_info->freed_extents[1], start, end, | |
91166212 | 10835 | EXTENT_DIRTY); |
758eb51e | 10836 | if (ret) { |
d4b450cd | 10837 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
2ff7e61e | 10838 | btrfs_dec_block_group_ro(block_group); |
758eb51e FM |
10839 | goto end_trans; |
10840 | } | |
d4b450cd | 10841 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
47ab2a6c JB |
10842 | |
10843 | /* Reset pinned so btrfs_put_block_group doesn't complain */ | |
c30666d4 ZL |
10844 | spin_lock(&space_info->lock); |
10845 | spin_lock(&block_group->lock); | |
10846 | ||
e2907c1a | 10847 | update_bytes_pinned(space_info, -block_group->pinned); |
c30666d4 | 10848 | space_info->bytes_readonly += block_group->pinned; |
dec59fa3 EL |
10849 | percpu_counter_add_batch(&space_info->total_bytes_pinned, |
10850 | -block_group->pinned, | |
10851 | BTRFS_TOTAL_BYTES_PINNED_BATCH); | |
47ab2a6c JB |
10852 | block_group->pinned = 0; |
10853 | ||
c30666d4 ZL |
10854 | spin_unlock(&block_group->lock); |
10855 | spin_unlock(&space_info->lock); | |
10856 | ||
e33e17ee | 10857 | /* DISCARD can flip during remount */ |
0b246afa | 10858 | trimming = btrfs_test_opt(fs_info, DISCARD); |
e33e17ee JM |
10859 | |
10860 | /* Implicit trim during transaction commit. */ | |
10861 | if (trimming) | |
10862 | btrfs_get_block_group_trimming(block_group); | |
10863 | ||
47ab2a6c JB |
10864 | /* |
10865 | * Btrfs_remove_chunk will abort the transaction if things go | |
10866 | * horribly wrong. | |
10867 | */ | |
97aff912 | 10868 | ret = btrfs_remove_chunk(trans, block_group->key.objectid); |
e33e17ee JM |
10869 | |
10870 | if (ret) { | |
10871 | if (trimming) | |
10872 | btrfs_put_block_group_trimming(block_group); | |
10873 | goto end_trans; | |
10874 | } | |
10875 | ||
10876 | /* | |
10877 | * If we're not mounted with -odiscard, we can just forget | |
10878 | * about this block group. Otherwise we'll need to wait | |
10879 | * until transaction commit to do the actual discard. | |
10880 | */ | |
10881 | if (trimming) { | |
348a0013 FM |
10882 | spin_lock(&fs_info->unused_bgs_lock); |
10883 | /* | |
10884 | * A concurrent scrub might have added us to the list | |
10885 | * fs_info->unused_bgs, so use a list_move operation | |
10886 | * to add the block group to the deleted_bgs list. | |
10887 | */ | |
e33e17ee JM |
10888 | list_move(&block_group->bg_list, |
10889 | &trans->transaction->deleted_bgs); | |
348a0013 | 10890 | spin_unlock(&fs_info->unused_bgs_lock); |
e33e17ee JM |
10891 | btrfs_get_block_group(block_group); |
10892 | } | |
758eb51e | 10893 | end_trans: |
3a45bb20 | 10894 | btrfs_end_transaction(trans); |
47ab2a6c | 10895 | next: |
d5f2e33b | 10896 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
47ab2a6c JB |
10897 | btrfs_put_block_group(block_group); |
10898 | spin_lock(&fs_info->unused_bgs_lock); | |
10899 | } | |
10900 | spin_unlock(&fs_info->unused_bgs_lock); | |
10901 | } | |
10902 | ||
c59021f8 | 10903 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
10904 | { | |
1aba86d6 | 10905 | struct btrfs_super_block *disk_super; |
10906 | u64 features; | |
10907 | u64 flags; | |
10908 | int mixed = 0; | |
c59021f8 | 10909 | int ret; |
10910 | ||
6c41761f | 10911 | disk_super = fs_info->super_copy; |
1aba86d6 | 10912 | if (!btrfs_super_root(disk_super)) |
0dc924c5 | 10913 | return -EINVAL; |
c59021f8 | 10914 | |
1aba86d6 | 10915 | features = btrfs_super_incompat_flags(disk_super); |
10916 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
10917 | mixed = 1; | |
c59021f8 | 10918 | |
1aba86d6 | 10919 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
4ca61683 | 10920 | ret = create_space_info(fs_info, flags); |
c59021f8 | 10921 | if (ret) |
1aba86d6 | 10922 | goto out; |
c59021f8 | 10923 | |
1aba86d6 | 10924 | if (mixed) { |
10925 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
4ca61683 | 10926 | ret = create_space_info(fs_info, flags); |
1aba86d6 | 10927 | } else { |
10928 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
4ca61683 | 10929 | ret = create_space_info(fs_info, flags); |
1aba86d6 | 10930 | if (ret) |
10931 | goto out; | |
10932 | ||
10933 | flags = BTRFS_BLOCK_GROUP_DATA; | |
4ca61683 | 10934 | ret = create_space_info(fs_info, flags); |
1aba86d6 | 10935 | } |
10936 | out: | |
c59021f8 | 10937 | return ret; |
10938 | } | |
10939 | ||
2ff7e61e JM |
10940 | int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info, |
10941 | u64 start, u64 end) | |
acce952b | 10942 | { |
2ff7e61e | 10943 | return unpin_extent_range(fs_info, start, end, false); |
acce952b | 10944 | } |
10945 | ||
499f377f JM |
10946 | /* |
10947 | * It used to be that old block groups would be left around forever. | |
10948 | * Iterating over them would be enough to trim unused space. Since we | |
10949 | * now automatically remove them, we also need to iterate over unallocated | |
10950 | * space. | |
10951 | * | |
10952 | * We don't want a transaction for this since the discard may take a | |
10953 | * substantial amount of time. We don't require that a transaction be | |
10954 | * running, but we do need to take a running transaction into account | |
fee7acc3 JM |
10955 | * to ensure that we're not discarding chunks that were released or |
10956 | * allocated in the current transaction. | |
499f377f JM |
10957 | * |
10958 | * Holding the chunks lock will prevent other threads from allocating | |
10959 | * or releasing chunks, but it won't prevent a running transaction | |
10960 | * from committing and releasing the memory that the pending chunks | |
10961 | * list head uses. For that, we need to take a reference to the | |
fee7acc3 JM |
10962 | * transaction and hold the commit root sem. We only need to hold |
10963 | * it while performing the free space search since we have already | |
10964 | * held back allocations. | |
499f377f JM |
10965 | */ |
10966 | static int btrfs_trim_free_extents(struct btrfs_device *device, | |
10967 | u64 minlen, u64 *trimmed) | |
10968 | { | |
10969 | u64 start = 0, len = 0; | |
10970 | int ret; | |
10971 | ||
10972 | *trimmed = 0; | |
10973 | ||
0be88e36 JM |
10974 | /* Discard not supported = nothing to do. */ |
10975 | if (!blk_queue_discard(bdev_get_queue(device->bdev))) | |
10976 | return 0; | |
10977 | ||
499f377f | 10978 | /* Not writeable = nothing to do. */ |
ebbede42 | 10979 | if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) |
499f377f JM |
10980 | return 0; |
10981 | ||
10982 | /* No free space = nothing to do. */ | |
10983 | if (device->total_bytes <= device->bytes_used) | |
10984 | return 0; | |
10985 | ||
10986 | ret = 0; | |
10987 | ||
10988 | while (1) { | |
fb456252 | 10989 | struct btrfs_fs_info *fs_info = device->fs_info; |
499f377f JM |
10990 | struct btrfs_transaction *trans; |
10991 | u64 bytes; | |
10992 | ||
10993 | ret = mutex_lock_interruptible(&fs_info->chunk_mutex); | |
10994 | if (ret) | |
fee7acc3 | 10995 | break; |
499f377f | 10996 | |
fee7acc3 JM |
10997 | ret = down_read_killable(&fs_info->commit_root_sem); |
10998 | if (ret) { | |
10999 | mutex_unlock(&fs_info->chunk_mutex); | |
11000 | break; | |
11001 | } | |
499f377f JM |
11002 | |
11003 | spin_lock(&fs_info->trans_lock); | |
11004 | trans = fs_info->running_transaction; | |
11005 | if (trans) | |
9b64f57d | 11006 | refcount_inc(&trans->use_count); |
499f377f JM |
11007 | spin_unlock(&fs_info->trans_lock); |
11008 | ||
fee7acc3 JM |
11009 | if (!trans) |
11010 | up_read(&fs_info->commit_root_sem); | |
11011 | ||
499f377f JM |
11012 | ret = find_free_dev_extent_start(trans, device, minlen, start, |
11013 | &start, &len); | |
fee7acc3 JM |
11014 | if (trans) { |
11015 | up_read(&fs_info->commit_root_sem); | |
499f377f | 11016 | btrfs_put_transaction(trans); |
fee7acc3 | 11017 | } |
499f377f JM |
11018 | |
11019 | if (ret) { | |
499f377f JM |
11020 | mutex_unlock(&fs_info->chunk_mutex); |
11021 | if (ret == -ENOSPC) | |
11022 | ret = 0; | |
11023 | break; | |
11024 | } | |
11025 | ||
11026 | ret = btrfs_issue_discard(device->bdev, start, len, &bytes); | |
499f377f JM |
11027 | mutex_unlock(&fs_info->chunk_mutex); |
11028 | ||
11029 | if (ret) | |
11030 | break; | |
11031 | ||
11032 | start += len; | |
11033 | *trimmed += bytes; | |
11034 | ||
11035 | if (fatal_signal_pending(current)) { | |
11036 | ret = -ERESTARTSYS; | |
11037 | break; | |
11038 | } | |
11039 | ||
11040 | cond_resched(); | |
11041 | } | |
11042 | ||
11043 | return ret; | |
11044 | } | |
11045 | ||
93bba24d QW |
11046 | /* |
11047 | * Trim the whole filesystem by: | |
11048 | * 1) trimming the free space in each block group | |
11049 | * 2) trimming the unallocated space on each device | |
11050 | * | |
11051 | * This will also continue trimming even if a block group or device encounters | |
11052 | * an error. The return value will be the last error, or 0 if nothing bad | |
11053 | * happens. | |
11054 | */ | |
2ff7e61e | 11055 | int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range) |
f7039b1d | 11056 | { |
f7039b1d | 11057 | struct btrfs_block_group_cache *cache = NULL; |
499f377f JM |
11058 | struct btrfs_device *device; |
11059 | struct list_head *devices; | |
f7039b1d LD |
11060 | u64 group_trimmed; |
11061 | u64 start; | |
11062 | u64 end; | |
11063 | u64 trimmed = 0; | |
93bba24d QW |
11064 | u64 bg_failed = 0; |
11065 | u64 dev_failed = 0; | |
11066 | int bg_ret = 0; | |
11067 | int dev_ret = 0; | |
f7039b1d LD |
11068 | int ret = 0; |
11069 | ||
6ba9fc8e | 11070 | cache = btrfs_lookup_first_block_group(fs_info, range->start); |
93bba24d | 11071 | for (; cache; cache = next_block_group(fs_info, cache)) { |
f7039b1d LD |
11072 | if (cache->key.objectid >= (range->start + range->len)) { |
11073 | btrfs_put_block_group(cache); | |
11074 | break; | |
11075 | } | |
11076 | ||
11077 | start = max(range->start, cache->key.objectid); | |
11078 | end = min(range->start + range->len, | |
11079 | cache->key.objectid + cache->key.offset); | |
11080 | ||
11081 | if (end - start >= range->minlen) { | |
11082 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 11083 | ret = cache_block_group(cache, 0); |
1be41b78 | 11084 | if (ret) { |
93bba24d QW |
11085 | bg_failed++; |
11086 | bg_ret = ret; | |
11087 | continue; | |
1be41b78 JB |
11088 | } |
11089 | ret = wait_block_group_cache_done(cache); | |
11090 | if (ret) { | |
93bba24d QW |
11091 | bg_failed++; |
11092 | bg_ret = ret; | |
11093 | continue; | |
1be41b78 | 11094 | } |
f7039b1d LD |
11095 | } |
11096 | ret = btrfs_trim_block_group(cache, | |
11097 | &group_trimmed, | |
11098 | start, | |
11099 | end, | |
11100 | range->minlen); | |
11101 | ||
11102 | trimmed += group_trimmed; | |
11103 | if (ret) { | |
93bba24d QW |
11104 | bg_failed++; |
11105 | bg_ret = ret; | |
11106 | continue; | |
f7039b1d LD |
11107 | } |
11108 | } | |
f7039b1d LD |
11109 | } |
11110 | ||
93bba24d QW |
11111 | if (bg_failed) |
11112 | btrfs_warn(fs_info, | |
11113 | "failed to trim %llu block group(s), last error %d", | |
11114 | bg_failed, bg_ret); | |
0b246afa | 11115 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
d4e329de JM |
11116 | devices = &fs_info->fs_devices->devices; |
11117 | list_for_each_entry(device, devices, dev_list) { | |
499f377f JM |
11118 | ret = btrfs_trim_free_extents(device, range->minlen, |
11119 | &group_trimmed); | |
93bba24d QW |
11120 | if (ret) { |
11121 | dev_failed++; | |
11122 | dev_ret = ret; | |
499f377f | 11123 | break; |
93bba24d | 11124 | } |
499f377f JM |
11125 | |
11126 | trimmed += group_trimmed; | |
11127 | } | |
0b246afa | 11128 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
499f377f | 11129 | |
93bba24d QW |
11130 | if (dev_failed) |
11131 | btrfs_warn(fs_info, | |
11132 | "failed to trim %llu device(s), last error %d", | |
11133 | dev_failed, dev_ret); | |
f7039b1d | 11134 | range->len = trimmed; |
93bba24d QW |
11135 | if (bg_ret) |
11136 | return bg_ret; | |
11137 | return dev_ret; | |
f7039b1d | 11138 | } |
8257b2dc MX |
11139 | |
11140 | /* | |
ea14b57f | 11141 | * btrfs_{start,end}_write_no_snapshotting() are similar to |
9ea24bbe FM |
11142 | * mnt_{want,drop}_write(), they are used to prevent some tasks from writing |
11143 | * data into the page cache through nocow before the subvolume is snapshoted, | |
11144 | * but flush the data into disk after the snapshot creation, or to prevent | |
ea14b57f | 11145 | * operations while snapshotting is ongoing and that cause the snapshot to be |
9ea24bbe | 11146 | * inconsistent (writes followed by expanding truncates for example). |
8257b2dc | 11147 | */ |
ea14b57f | 11148 | void btrfs_end_write_no_snapshotting(struct btrfs_root *root) |
8257b2dc MX |
11149 | { |
11150 | percpu_counter_dec(&root->subv_writers->counter); | |
093258e6 | 11151 | cond_wake_up(&root->subv_writers->wait); |
8257b2dc MX |
11152 | } |
11153 | ||
ea14b57f | 11154 | int btrfs_start_write_no_snapshotting(struct btrfs_root *root) |
8257b2dc | 11155 | { |
ea14b57f | 11156 | if (atomic_read(&root->will_be_snapshotted)) |
8257b2dc MX |
11157 | return 0; |
11158 | ||
11159 | percpu_counter_inc(&root->subv_writers->counter); | |
11160 | /* | |
11161 | * Make sure counter is updated before we check for snapshot creation. | |
11162 | */ | |
11163 | smp_mb(); | |
ea14b57f DS |
11164 | if (atomic_read(&root->will_be_snapshotted)) { |
11165 | btrfs_end_write_no_snapshotting(root); | |
8257b2dc MX |
11166 | return 0; |
11167 | } | |
11168 | return 1; | |
11169 | } | |
0bc19f90 | 11170 | |
0bc19f90 ZL |
11171 | void btrfs_wait_for_snapshot_creation(struct btrfs_root *root) |
11172 | { | |
11173 | while (true) { | |
11174 | int ret; | |
11175 | ||
ea14b57f | 11176 | ret = btrfs_start_write_no_snapshotting(root); |
0bc19f90 ZL |
11177 | if (ret) |
11178 | break; | |
4625956a PZ |
11179 | wait_var_event(&root->will_be_snapshotted, |
11180 | !atomic_read(&root->will_be_snapshotted)); | |
0bc19f90 ZL |
11181 | } |
11182 | } | |
031f24da QW |
11183 | |
11184 | void btrfs_mark_bg_unused(struct btrfs_block_group_cache *bg) | |
11185 | { | |
11186 | struct btrfs_fs_info *fs_info = bg->fs_info; | |
11187 | ||
11188 | spin_lock(&fs_info->unused_bgs_lock); | |
11189 | if (list_empty(&bg->bg_list)) { | |
11190 | btrfs_get_block_group(bg); | |
11191 | trace_btrfs_add_unused_block_group(bg); | |
11192 | list_add_tail(&bg->bg_list, &fs_info->unused_bgs); | |
11193 | } | |
11194 | spin_unlock(&fs_info->unused_bgs_lock); | |
11195 | } |