Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
dff51cd1 | 26 | #include <linux/ratelimit.h> |
b150a4f1 | 27 | #include <linux/percpu_counter.h> |
4b4e25f2 | 28 | #include "compat.h" |
74493f7a | 29 | #include "hash.h" |
fec577fb CM |
30 | #include "ctree.h" |
31 | #include "disk-io.h" | |
32 | #include "print-tree.h" | |
e089f05c | 33 | #include "transaction.h" |
0b86a832 | 34 | #include "volumes.h" |
53b381b3 | 35 | #include "raid56.h" |
925baedd | 36 | #include "locking.h" |
fa9c0d79 | 37 | #include "free-space-cache.h" |
3fed40cc | 38 | #include "math.h" |
fec577fb | 39 | |
709c0486 AJ |
40 | #undef SCRAMBLE_DELAYED_REFS |
41 | ||
9e622d6b MX |
42 | /* |
43 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
44 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
45 | * if we really need one. | |
46 | * | |
0e4f8f88 CM |
47 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
48 | * if we have very few chunks already allocated. This is | |
49 | * used as part of the clustering code to help make sure | |
50 | * we have a good pool of storage to cluster in, without | |
51 | * filling the FS with empty chunks | |
52 | * | |
9e622d6b MX |
53 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
54 | * | |
0e4f8f88 CM |
55 | */ |
56 | enum { | |
57 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
58 | CHUNK_ALLOC_LIMITED = 1, |
59 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
60 | }; |
61 | ||
fb25e914 JB |
62 | /* |
63 | * Control how reservations are dealt with. | |
64 | * | |
65 | * RESERVE_FREE - freeing a reservation. | |
66 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
67 | * ENOSPC accounting | |
68 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
69 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
70 | */ | |
71 | enum { | |
72 | RESERVE_FREE = 0, | |
73 | RESERVE_ALLOC = 1, | |
74 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
75 | }; | |
76 | ||
c53d613e | 77 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 78 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
79 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
80 | struct btrfs_root *root, | |
81 | u64 bytenr, u64 num_bytes, u64 parent, | |
82 | u64 root_objectid, u64 owner_objectid, | |
83 | u64 owner_offset, int refs_to_drop, | |
84 | struct btrfs_delayed_extent_op *extra_op); | |
85 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
86 | struct extent_buffer *leaf, | |
87 | struct btrfs_extent_item *ei); | |
88 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
89 | struct btrfs_root *root, | |
90 | u64 parent, u64 root_objectid, | |
91 | u64 flags, u64 owner, u64 offset, | |
92 | struct btrfs_key *ins, int ref_mod); | |
93 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
94 | struct btrfs_root *root, | |
95 | u64 parent, u64 root_objectid, | |
96 | u64 flags, struct btrfs_disk_key *key, | |
97 | int level, struct btrfs_key *ins); | |
6a63209f | 98 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 JB |
99 | struct btrfs_root *extent_root, u64 flags, |
100 | int force); | |
11833d66 YZ |
101 | static int find_next_key(struct btrfs_path *path, int level, |
102 | struct btrfs_key *key); | |
9ed74f2d JB |
103 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
104 | int dump_block_groups); | |
fb25e914 JB |
105 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
106 | u64 num_bytes, int reserve); | |
5d80366e JB |
107 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
108 | u64 num_bytes); | |
48a3b636 ES |
109 | int btrfs_pin_extent(struct btrfs_root *root, |
110 | u64 bytenr, u64 num_bytes, int reserved); | |
6a63209f | 111 | |
817d52f8 JB |
112 | static noinline int |
113 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
114 | { | |
115 | smp_mb(); | |
116 | return cache->cached == BTRFS_CACHE_FINISHED; | |
117 | } | |
118 | ||
0f9dd46c JB |
119 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
120 | { | |
121 | return (cache->flags & bits) == bits; | |
122 | } | |
123 | ||
62a45b60 | 124 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
125 | { |
126 | atomic_inc(&cache->count); | |
127 | } | |
128 | ||
129 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
130 | { | |
f0486c68 YZ |
131 | if (atomic_dec_and_test(&cache->count)) { |
132 | WARN_ON(cache->pinned > 0); | |
133 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 134 | kfree(cache->free_space_ctl); |
11dfe35a | 135 | kfree(cache); |
f0486c68 | 136 | } |
11dfe35a JB |
137 | } |
138 | ||
0f9dd46c JB |
139 | /* |
140 | * this adds the block group to the fs_info rb tree for the block group | |
141 | * cache | |
142 | */ | |
b2950863 | 143 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
144 | struct btrfs_block_group_cache *block_group) |
145 | { | |
146 | struct rb_node **p; | |
147 | struct rb_node *parent = NULL; | |
148 | struct btrfs_block_group_cache *cache; | |
149 | ||
150 | spin_lock(&info->block_group_cache_lock); | |
151 | p = &info->block_group_cache_tree.rb_node; | |
152 | ||
153 | while (*p) { | |
154 | parent = *p; | |
155 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
156 | cache_node); | |
157 | if (block_group->key.objectid < cache->key.objectid) { | |
158 | p = &(*p)->rb_left; | |
159 | } else if (block_group->key.objectid > cache->key.objectid) { | |
160 | p = &(*p)->rb_right; | |
161 | } else { | |
162 | spin_unlock(&info->block_group_cache_lock); | |
163 | return -EEXIST; | |
164 | } | |
165 | } | |
166 | ||
167 | rb_link_node(&block_group->cache_node, parent, p); | |
168 | rb_insert_color(&block_group->cache_node, | |
169 | &info->block_group_cache_tree); | |
a1897fdd LB |
170 | |
171 | if (info->first_logical_byte > block_group->key.objectid) | |
172 | info->first_logical_byte = block_group->key.objectid; | |
173 | ||
0f9dd46c JB |
174 | spin_unlock(&info->block_group_cache_lock); |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | /* | |
180 | * This will return the block group at or after bytenr if contains is 0, else | |
181 | * it will return the block group that contains the bytenr | |
182 | */ | |
183 | static struct btrfs_block_group_cache * | |
184 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
185 | int contains) | |
186 | { | |
187 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
188 | struct rb_node *n; | |
189 | u64 end, start; | |
190 | ||
191 | spin_lock(&info->block_group_cache_lock); | |
192 | n = info->block_group_cache_tree.rb_node; | |
193 | ||
194 | while (n) { | |
195 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
196 | cache_node); | |
197 | end = cache->key.objectid + cache->key.offset - 1; | |
198 | start = cache->key.objectid; | |
199 | ||
200 | if (bytenr < start) { | |
201 | if (!contains && (!ret || start < ret->key.objectid)) | |
202 | ret = cache; | |
203 | n = n->rb_left; | |
204 | } else if (bytenr > start) { | |
205 | if (contains && bytenr <= end) { | |
206 | ret = cache; | |
207 | break; | |
208 | } | |
209 | n = n->rb_right; | |
210 | } else { | |
211 | ret = cache; | |
212 | break; | |
213 | } | |
214 | } | |
a1897fdd | 215 | if (ret) { |
11dfe35a | 216 | btrfs_get_block_group(ret); |
a1897fdd LB |
217 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
218 | info->first_logical_byte = ret->key.objectid; | |
219 | } | |
0f9dd46c JB |
220 | spin_unlock(&info->block_group_cache_lock); |
221 | ||
222 | return ret; | |
223 | } | |
224 | ||
11833d66 YZ |
225 | static int add_excluded_extent(struct btrfs_root *root, |
226 | u64 start, u64 num_bytes) | |
817d52f8 | 227 | { |
11833d66 YZ |
228 | u64 end = start + num_bytes - 1; |
229 | set_extent_bits(&root->fs_info->freed_extents[0], | |
230 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
231 | set_extent_bits(&root->fs_info->freed_extents[1], | |
232 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
233 | return 0; | |
234 | } | |
817d52f8 | 235 | |
11833d66 YZ |
236 | static void free_excluded_extents(struct btrfs_root *root, |
237 | struct btrfs_block_group_cache *cache) | |
238 | { | |
239 | u64 start, end; | |
817d52f8 | 240 | |
11833d66 YZ |
241 | start = cache->key.objectid; |
242 | end = start + cache->key.offset - 1; | |
243 | ||
244 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
245 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
246 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
247 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
248 | } |
249 | ||
11833d66 YZ |
250 | static int exclude_super_stripes(struct btrfs_root *root, |
251 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 252 | { |
817d52f8 JB |
253 | u64 bytenr; |
254 | u64 *logical; | |
255 | int stripe_len; | |
256 | int i, nr, ret; | |
257 | ||
06b2331f YZ |
258 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
259 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
260 | cache->bytes_super += stripe_len; | |
261 | ret = add_excluded_extent(root, cache->key.objectid, | |
262 | stripe_len); | |
835d974f JB |
263 | if (ret) |
264 | return ret; | |
06b2331f YZ |
265 | } |
266 | ||
817d52f8 JB |
267 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
268 | bytenr = btrfs_sb_offset(i); | |
269 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
270 | cache->key.objectid, bytenr, | |
271 | 0, &logical, &nr, &stripe_len); | |
835d974f JB |
272 | if (ret) |
273 | return ret; | |
11833d66 | 274 | |
817d52f8 | 275 | while (nr--) { |
51bf5f0b JB |
276 | u64 start, len; |
277 | ||
278 | if (logical[nr] > cache->key.objectid + | |
279 | cache->key.offset) | |
280 | continue; | |
281 | ||
282 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
283 | continue; | |
284 | ||
285 | start = logical[nr]; | |
286 | if (start < cache->key.objectid) { | |
287 | start = cache->key.objectid; | |
288 | len = (logical[nr] + stripe_len) - start; | |
289 | } else { | |
290 | len = min_t(u64, stripe_len, | |
291 | cache->key.objectid + | |
292 | cache->key.offset - start); | |
293 | } | |
294 | ||
295 | cache->bytes_super += len; | |
296 | ret = add_excluded_extent(root, start, len); | |
835d974f JB |
297 | if (ret) { |
298 | kfree(logical); | |
299 | return ret; | |
300 | } | |
817d52f8 | 301 | } |
11833d66 | 302 | |
817d52f8 JB |
303 | kfree(logical); |
304 | } | |
817d52f8 JB |
305 | return 0; |
306 | } | |
307 | ||
11833d66 YZ |
308 | static struct btrfs_caching_control * |
309 | get_caching_control(struct btrfs_block_group_cache *cache) | |
310 | { | |
311 | struct btrfs_caching_control *ctl; | |
312 | ||
313 | spin_lock(&cache->lock); | |
314 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
315 | spin_unlock(&cache->lock); | |
316 | return NULL; | |
317 | } | |
318 | ||
dde5abee JB |
319 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
320 | if (!cache->caching_ctl) { | |
321 | spin_unlock(&cache->lock); | |
11833d66 YZ |
322 | return NULL; |
323 | } | |
324 | ||
325 | ctl = cache->caching_ctl; | |
326 | atomic_inc(&ctl->count); | |
327 | spin_unlock(&cache->lock); | |
328 | return ctl; | |
329 | } | |
330 | ||
331 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
332 | { | |
333 | if (atomic_dec_and_test(&ctl->count)) | |
334 | kfree(ctl); | |
335 | } | |
336 | ||
0f9dd46c JB |
337 | /* |
338 | * this is only called by cache_block_group, since we could have freed extents | |
339 | * we need to check the pinned_extents for any extents that can't be used yet | |
340 | * since their free space will be released as soon as the transaction commits. | |
341 | */ | |
817d52f8 | 342 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
343 | struct btrfs_fs_info *info, u64 start, u64 end) |
344 | { | |
817d52f8 | 345 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
346 | int ret; |
347 | ||
348 | while (start < end) { | |
11833d66 | 349 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 350 | &extent_start, &extent_end, |
e6138876 JB |
351 | EXTENT_DIRTY | EXTENT_UPTODATE, |
352 | NULL); | |
0f9dd46c JB |
353 | if (ret) |
354 | break; | |
355 | ||
06b2331f | 356 | if (extent_start <= start) { |
0f9dd46c JB |
357 | start = extent_end + 1; |
358 | } else if (extent_start > start && extent_start < end) { | |
359 | size = extent_start - start; | |
817d52f8 | 360 | total_added += size; |
ea6a478e JB |
361 | ret = btrfs_add_free_space(block_group, start, |
362 | size); | |
79787eaa | 363 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
364 | start = extent_end + 1; |
365 | } else { | |
366 | break; | |
367 | } | |
368 | } | |
369 | ||
370 | if (start < end) { | |
371 | size = end - start; | |
817d52f8 | 372 | total_added += size; |
ea6a478e | 373 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 374 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
375 | } |
376 | ||
817d52f8 | 377 | return total_added; |
0f9dd46c JB |
378 | } |
379 | ||
bab39bf9 | 380 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 381 | { |
bab39bf9 JB |
382 | struct btrfs_block_group_cache *block_group; |
383 | struct btrfs_fs_info *fs_info; | |
384 | struct btrfs_caching_control *caching_ctl; | |
385 | struct btrfs_root *extent_root; | |
e37c9e69 | 386 | struct btrfs_path *path; |
5f39d397 | 387 | struct extent_buffer *leaf; |
11833d66 | 388 | struct btrfs_key key; |
817d52f8 | 389 | u64 total_found = 0; |
11833d66 YZ |
390 | u64 last = 0; |
391 | u32 nritems; | |
392 | int ret = 0; | |
f510cfec | 393 | |
bab39bf9 JB |
394 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
395 | block_group = caching_ctl->block_group; | |
396 | fs_info = block_group->fs_info; | |
397 | extent_root = fs_info->extent_root; | |
398 | ||
e37c9e69 CM |
399 | path = btrfs_alloc_path(); |
400 | if (!path) | |
bab39bf9 | 401 | goto out; |
7d7d6068 | 402 | |
817d52f8 | 403 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 404 | |
5cd57b2c | 405 | /* |
817d52f8 JB |
406 | * We don't want to deadlock with somebody trying to allocate a new |
407 | * extent for the extent root while also trying to search the extent | |
408 | * root to add free space. So we skip locking and search the commit | |
409 | * root, since its read-only | |
5cd57b2c CM |
410 | */ |
411 | path->skip_locking = 1; | |
817d52f8 | 412 | path->search_commit_root = 1; |
026fd317 | 413 | path->reada = 1; |
817d52f8 | 414 | |
e4404d6e | 415 | key.objectid = last; |
e37c9e69 | 416 | key.offset = 0; |
11833d66 | 417 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 418 | again: |
11833d66 | 419 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
420 | /* need to make sure the commit_root doesn't disappear */ |
421 | down_read(&fs_info->extent_commit_sem); | |
422 | ||
11833d66 | 423 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 424 | if (ret < 0) |
ef8bbdfe | 425 | goto err; |
a512bbf8 | 426 | |
11833d66 YZ |
427 | leaf = path->nodes[0]; |
428 | nritems = btrfs_header_nritems(leaf); | |
429 | ||
d397712b | 430 | while (1) { |
7841cb28 | 431 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 432 | last = (u64)-1; |
817d52f8 | 433 | break; |
f25784b3 | 434 | } |
817d52f8 | 435 | |
11833d66 YZ |
436 | if (path->slots[0] < nritems) { |
437 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
438 | } else { | |
439 | ret = find_next_key(path, 0, &key); | |
440 | if (ret) | |
e37c9e69 | 441 | break; |
817d52f8 | 442 | |
0a3896d0 | 443 | if (need_resched()) { |
589d8ade | 444 | caching_ctl->progress = last; |
ff5714cc | 445 | btrfs_release_path(path); |
589d8ade JB |
446 | up_read(&fs_info->extent_commit_sem); |
447 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 448 | cond_resched(); |
589d8ade JB |
449 | goto again; |
450 | } | |
0a3896d0 JB |
451 | |
452 | ret = btrfs_next_leaf(extent_root, path); | |
453 | if (ret < 0) | |
454 | goto err; | |
455 | if (ret) | |
456 | break; | |
589d8ade JB |
457 | leaf = path->nodes[0]; |
458 | nritems = btrfs_header_nritems(leaf); | |
459 | continue; | |
11833d66 | 460 | } |
817d52f8 | 461 | |
11833d66 YZ |
462 | if (key.objectid < block_group->key.objectid) { |
463 | path->slots[0]++; | |
817d52f8 | 464 | continue; |
e37c9e69 | 465 | } |
0f9dd46c | 466 | |
e37c9e69 | 467 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 468 | block_group->key.offset) |
e37c9e69 | 469 | break; |
7d7d6068 | 470 | |
3173a18f JB |
471 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
472 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
817d52f8 JB |
473 | total_found += add_new_free_space(block_group, |
474 | fs_info, last, | |
475 | key.objectid); | |
3173a18f JB |
476 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
477 | last = key.objectid + | |
478 | fs_info->tree_root->leafsize; | |
479 | else | |
480 | last = key.objectid + key.offset; | |
817d52f8 | 481 | |
11833d66 YZ |
482 | if (total_found > (1024 * 1024 * 2)) { |
483 | total_found = 0; | |
484 | wake_up(&caching_ctl->wait); | |
485 | } | |
817d52f8 | 486 | } |
e37c9e69 CM |
487 | path->slots[0]++; |
488 | } | |
817d52f8 | 489 | ret = 0; |
e37c9e69 | 490 | |
817d52f8 JB |
491 | total_found += add_new_free_space(block_group, fs_info, last, |
492 | block_group->key.objectid + | |
493 | block_group->key.offset); | |
11833d66 | 494 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
495 | |
496 | spin_lock(&block_group->lock); | |
11833d66 | 497 | block_group->caching_ctl = NULL; |
817d52f8 JB |
498 | block_group->cached = BTRFS_CACHE_FINISHED; |
499 | spin_unlock(&block_group->lock); | |
0f9dd46c | 500 | |
54aa1f4d | 501 | err: |
e37c9e69 | 502 | btrfs_free_path(path); |
276e680d | 503 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 504 | |
11833d66 YZ |
505 | free_excluded_extents(extent_root, block_group); |
506 | ||
507 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 508 | out: |
11833d66 YZ |
509 | wake_up(&caching_ctl->wait); |
510 | ||
511 | put_caching_control(caching_ctl); | |
11dfe35a | 512 | btrfs_put_block_group(block_group); |
817d52f8 JB |
513 | } |
514 | ||
9d66e233 | 515 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 516 | int load_cache_only) |
817d52f8 | 517 | { |
291c7d2f | 518 | DEFINE_WAIT(wait); |
11833d66 YZ |
519 | struct btrfs_fs_info *fs_info = cache->fs_info; |
520 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
521 | int ret = 0; |
522 | ||
291c7d2f | 523 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
524 | if (!caching_ctl) |
525 | return -ENOMEM; | |
291c7d2f JB |
526 | |
527 | INIT_LIST_HEAD(&caching_ctl->list); | |
528 | mutex_init(&caching_ctl->mutex); | |
529 | init_waitqueue_head(&caching_ctl->wait); | |
530 | caching_ctl->block_group = cache; | |
531 | caching_ctl->progress = cache->key.objectid; | |
532 | atomic_set(&caching_ctl->count, 1); | |
533 | caching_ctl->work.func = caching_thread; | |
534 | ||
535 | spin_lock(&cache->lock); | |
536 | /* | |
537 | * This should be a rare occasion, but this could happen I think in the | |
538 | * case where one thread starts to load the space cache info, and then | |
539 | * some other thread starts a transaction commit which tries to do an | |
540 | * allocation while the other thread is still loading the space cache | |
541 | * info. The previous loop should have kept us from choosing this block | |
542 | * group, but if we've moved to the state where we will wait on caching | |
543 | * block groups we need to first check if we're doing a fast load here, | |
544 | * so we can wait for it to finish, otherwise we could end up allocating | |
545 | * from a block group who's cache gets evicted for one reason or | |
546 | * another. | |
547 | */ | |
548 | while (cache->cached == BTRFS_CACHE_FAST) { | |
549 | struct btrfs_caching_control *ctl; | |
550 | ||
551 | ctl = cache->caching_ctl; | |
552 | atomic_inc(&ctl->count); | |
553 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
554 | spin_unlock(&cache->lock); | |
555 | ||
556 | schedule(); | |
557 | ||
558 | finish_wait(&ctl->wait, &wait); | |
559 | put_caching_control(ctl); | |
560 | spin_lock(&cache->lock); | |
561 | } | |
562 | ||
563 | if (cache->cached != BTRFS_CACHE_NO) { | |
564 | spin_unlock(&cache->lock); | |
565 | kfree(caching_ctl); | |
11833d66 | 566 | return 0; |
291c7d2f JB |
567 | } |
568 | WARN_ON(cache->caching_ctl); | |
569 | cache->caching_ctl = caching_ctl; | |
570 | cache->cached = BTRFS_CACHE_FAST; | |
571 | spin_unlock(&cache->lock); | |
11833d66 | 572 | |
d53ba474 | 573 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
9d66e233 JB |
574 | ret = load_free_space_cache(fs_info, cache); |
575 | ||
576 | spin_lock(&cache->lock); | |
577 | if (ret == 1) { | |
291c7d2f | 578 | cache->caching_ctl = NULL; |
9d66e233 JB |
579 | cache->cached = BTRFS_CACHE_FINISHED; |
580 | cache->last_byte_to_unpin = (u64)-1; | |
581 | } else { | |
291c7d2f JB |
582 | if (load_cache_only) { |
583 | cache->caching_ctl = NULL; | |
584 | cache->cached = BTRFS_CACHE_NO; | |
585 | } else { | |
586 | cache->cached = BTRFS_CACHE_STARTED; | |
587 | } | |
9d66e233 JB |
588 | } |
589 | spin_unlock(&cache->lock); | |
291c7d2f | 590 | wake_up(&caching_ctl->wait); |
3c14874a | 591 | if (ret == 1) { |
291c7d2f | 592 | put_caching_control(caching_ctl); |
3c14874a | 593 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 594 | return 0; |
3c14874a | 595 | } |
291c7d2f JB |
596 | } else { |
597 | /* | |
598 | * We are not going to do the fast caching, set cached to the | |
599 | * appropriate value and wakeup any waiters. | |
600 | */ | |
601 | spin_lock(&cache->lock); | |
602 | if (load_cache_only) { | |
603 | cache->caching_ctl = NULL; | |
604 | cache->cached = BTRFS_CACHE_NO; | |
605 | } else { | |
606 | cache->cached = BTRFS_CACHE_STARTED; | |
607 | } | |
608 | spin_unlock(&cache->lock); | |
609 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
610 | } |
611 | ||
291c7d2f JB |
612 | if (load_cache_only) { |
613 | put_caching_control(caching_ctl); | |
11833d66 | 614 | return 0; |
817d52f8 | 615 | } |
817d52f8 | 616 | |
11833d66 | 617 | down_write(&fs_info->extent_commit_sem); |
291c7d2f | 618 | atomic_inc(&caching_ctl->count); |
11833d66 YZ |
619 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
620 | up_write(&fs_info->extent_commit_sem); | |
621 | ||
11dfe35a | 622 | btrfs_get_block_group(cache); |
11833d66 | 623 | |
bab39bf9 | 624 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 625 | |
ef8bbdfe | 626 | return ret; |
e37c9e69 CM |
627 | } |
628 | ||
0f9dd46c JB |
629 | /* |
630 | * return the block group that starts at or after bytenr | |
631 | */ | |
d397712b CM |
632 | static struct btrfs_block_group_cache * |
633 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 634 | { |
0f9dd46c | 635 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 636 | |
0f9dd46c | 637 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 638 | |
0f9dd46c | 639 | return cache; |
0ef3e66b CM |
640 | } |
641 | ||
0f9dd46c | 642 | /* |
9f55684c | 643 | * return the block group that contains the given bytenr |
0f9dd46c | 644 | */ |
d397712b CM |
645 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
646 | struct btrfs_fs_info *info, | |
647 | u64 bytenr) | |
be744175 | 648 | { |
0f9dd46c | 649 | struct btrfs_block_group_cache *cache; |
be744175 | 650 | |
0f9dd46c | 651 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 652 | |
0f9dd46c | 653 | return cache; |
be744175 | 654 | } |
0b86a832 | 655 | |
0f9dd46c JB |
656 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
657 | u64 flags) | |
6324fbf3 | 658 | { |
0f9dd46c | 659 | struct list_head *head = &info->space_info; |
0f9dd46c | 660 | struct btrfs_space_info *found; |
4184ea7f | 661 | |
52ba6929 | 662 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 663 | |
4184ea7f CM |
664 | rcu_read_lock(); |
665 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 666 | if (found->flags & flags) { |
4184ea7f | 667 | rcu_read_unlock(); |
0f9dd46c | 668 | return found; |
4184ea7f | 669 | } |
0f9dd46c | 670 | } |
4184ea7f | 671 | rcu_read_unlock(); |
0f9dd46c | 672 | return NULL; |
6324fbf3 CM |
673 | } |
674 | ||
4184ea7f CM |
675 | /* |
676 | * after adding space to the filesystem, we need to clear the full flags | |
677 | * on all the space infos. | |
678 | */ | |
679 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
680 | { | |
681 | struct list_head *head = &info->space_info; | |
682 | struct btrfs_space_info *found; | |
683 | ||
684 | rcu_read_lock(); | |
685 | list_for_each_entry_rcu(found, head, list) | |
686 | found->full = 0; | |
687 | rcu_read_unlock(); | |
688 | } | |
689 | ||
e02119d5 | 690 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 691 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
692 | { |
693 | int ret; | |
694 | struct btrfs_key key; | |
31840ae1 | 695 | struct btrfs_path *path; |
e02119d5 | 696 | |
31840ae1 | 697 | path = btrfs_alloc_path(); |
d8926bb3 MF |
698 | if (!path) |
699 | return -ENOMEM; | |
700 | ||
e02119d5 CM |
701 | key.objectid = start; |
702 | key.offset = len; | |
3173a18f | 703 | key.type = BTRFS_EXTENT_ITEM_KEY; |
e02119d5 CM |
704 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
705 | 0, 0); | |
3173a18f JB |
706 | if (ret > 0) { |
707 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
708 | if (key.objectid == start && | |
709 | key.type == BTRFS_METADATA_ITEM_KEY) | |
710 | ret = 0; | |
711 | } | |
31840ae1 | 712 | btrfs_free_path(path); |
7bb86316 CM |
713 | return ret; |
714 | } | |
715 | ||
a22285a6 | 716 | /* |
3173a18f | 717 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
718 | * |
719 | * the head node for delayed ref is used to store the sum of all the | |
720 | * reference count modifications queued up in the rbtree. the head | |
721 | * node may also store the extent flags to set. This way you can check | |
722 | * to see what the reference count and extent flags would be if all of | |
723 | * the delayed refs are not processed. | |
724 | */ | |
725 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
726 | struct btrfs_root *root, u64 bytenr, | |
3173a18f | 727 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
728 | { |
729 | struct btrfs_delayed_ref_head *head; | |
730 | struct btrfs_delayed_ref_root *delayed_refs; | |
731 | struct btrfs_path *path; | |
732 | struct btrfs_extent_item *ei; | |
733 | struct extent_buffer *leaf; | |
734 | struct btrfs_key key; | |
735 | u32 item_size; | |
736 | u64 num_refs; | |
737 | u64 extent_flags; | |
738 | int ret; | |
739 | ||
3173a18f JB |
740 | /* |
741 | * If we don't have skinny metadata, don't bother doing anything | |
742 | * different | |
743 | */ | |
744 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { | |
745 | offset = root->leafsize; | |
746 | metadata = 0; | |
747 | } | |
748 | ||
a22285a6 YZ |
749 | path = btrfs_alloc_path(); |
750 | if (!path) | |
751 | return -ENOMEM; | |
752 | ||
3173a18f JB |
753 | if (metadata) { |
754 | key.objectid = bytenr; | |
755 | key.type = BTRFS_METADATA_ITEM_KEY; | |
756 | key.offset = offset; | |
757 | } else { | |
758 | key.objectid = bytenr; | |
759 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
760 | key.offset = offset; | |
761 | } | |
762 | ||
a22285a6 YZ |
763 | if (!trans) { |
764 | path->skip_locking = 1; | |
765 | path->search_commit_root = 1; | |
766 | } | |
767 | again: | |
768 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
769 | &key, path, 0, 0); | |
770 | if (ret < 0) | |
771 | goto out_free; | |
772 | ||
3173a18f JB |
773 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
774 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
775 | key.offset = root->leafsize; | |
776 | btrfs_release_path(path); | |
777 | goto again; | |
778 | } | |
779 | ||
a22285a6 YZ |
780 | if (ret == 0) { |
781 | leaf = path->nodes[0]; | |
782 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
783 | if (item_size >= sizeof(*ei)) { | |
784 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
785 | struct btrfs_extent_item); | |
786 | num_refs = btrfs_extent_refs(leaf, ei); | |
787 | extent_flags = btrfs_extent_flags(leaf, ei); | |
788 | } else { | |
789 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
790 | struct btrfs_extent_item_v0 *ei0; | |
791 | BUG_ON(item_size != sizeof(*ei0)); | |
792 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
793 | struct btrfs_extent_item_v0); | |
794 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
795 | /* FIXME: this isn't correct for data */ | |
796 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
797 | #else | |
798 | BUG(); | |
799 | #endif | |
800 | } | |
801 | BUG_ON(num_refs == 0); | |
802 | } else { | |
803 | num_refs = 0; | |
804 | extent_flags = 0; | |
805 | ret = 0; | |
806 | } | |
807 | ||
808 | if (!trans) | |
809 | goto out; | |
810 | ||
811 | delayed_refs = &trans->transaction->delayed_refs; | |
812 | spin_lock(&delayed_refs->lock); | |
813 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
814 | if (head) { | |
815 | if (!mutex_trylock(&head->mutex)) { | |
816 | atomic_inc(&head->node.refs); | |
817 | spin_unlock(&delayed_refs->lock); | |
818 | ||
b3b4aa74 | 819 | btrfs_release_path(path); |
a22285a6 | 820 | |
8cc33e5c DS |
821 | /* |
822 | * Mutex was contended, block until it's released and try | |
823 | * again | |
824 | */ | |
a22285a6 YZ |
825 | mutex_lock(&head->mutex); |
826 | mutex_unlock(&head->mutex); | |
827 | btrfs_put_delayed_ref(&head->node); | |
828 | goto again; | |
829 | } | |
830 | if (head->extent_op && head->extent_op->update_flags) | |
831 | extent_flags |= head->extent_op->flags_to_set; | |
832 | else | |
833 | BUG_ON(num_refs == 0); | |
834 | ||
835 | num_refs += head->node.ref_mod; | |
836 | mutex_unlock(&head->mutex); | |
837 | } | |
838 | spin_unlock(&delayed_refs->lock); | |
839 | out: | |
840 | WARN_ON(num_refs == 0); | |
841 | if (refs) | |
842 | *refs = num_refs; | |
843 | if (flags) | |
844 | *flags = extent_flags; | |
845 | out_free: | |
846 | btrfs_free_path(path); | |
847 | return ret; | |
848 | } | |
849 | ||
d8d5f3e1 CM |
850 | /* |
851 | * Back reference rules. Back refs have three main goals: | |
852 | * | |
853 | * 1) differentiate between all holders of references to an extent so that | |
854 | * when a reference is dropped we can make sure it was a valid reference | |
855 | * before freeing the extent. | |
856 | * | |
857 | * 2) Provide enough information to quickly find the holders of an extent | |
858 | * if we notice a given block is corrupted or bad. | |
859 | * | |
860 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
861 | * maintenance. This is actually the same as #2, but with a slightly | |
862 | * different use case. | |
863 | * | |
5d4f98a2 YZ |
864 | * There are two kinds of back refs. The implicit back refs is optimized |
865 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
866 | * back refs of this kind provide information about the block's owner tree | |
867 | * and the pointer's key. These information allow us to find the block by | |
868 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
869 | * referenced by their owner trees. The location of tree block is recorded | |
870 | * in the back refs. Actually the full back refs is generic, and can be | |
871 | * used in all cases the implicit back refs is used. The major shortcoming | |
872 | * of the full back refs is its overhead. Every time a tree block gets | |
873 | * COWed, we have to update back refs entry for all pointers in it. | |
874 | * | |
875 | * For a newly allocated tree block, we use implicit back refs for | |
876 | * pointers in it. This means most tree related operations only involve | |
877 | * implicit back refs. For a tree block created in old transaction, the | |
878 | * only way to drop a reference to it is COW it. So we can detect the | |
879 | * event that tree block loses its owner tree's reference and do the | |
880 | * back refs conversion. | |
881 | * | |
882 | * When a tree block is COW'd through a tree, there are four cases: | |
883 | * | |
884 | * The reference count of the block is one and the tree is the block's | |
885 | * owner tree. Nothing to do in this case. | |
886 | * | |
887 | * The reference count of the block is one and the tree is not the | |
888 | * block's owner tree. In this case, full back refs is used for pointers | |
889 | * in the block. Remove these full back refs, add implicit back refs for | |
890 | * every pointers in the new block. | |
891 | * | |
892 | * The reference count of the block is greater than one and the tree is | |
893 | * the block's owner tree. In this case, implicit back refs is used for | |
894 | * pointers in the block. Add full back refs for every pointers in the | |
895 | * block, increase lower level extents' reference counts. The original | |
896 | * implicit back refs are entailed to the new block. | |
897 | * | |
898 | * The reference count of the block is greater than one and the tree is | |
899 | * not the block's owner tree. Add implicit back refs for every pointer in | |
900 | * the new block, increase lower level extents' reference count. | |
901 | * | |
902 | * Back Reference Key composing: | |
903 | * | |
904 | * The key objectid corresponds to the first byte in the extent, | |
905 | * The key type is used to differentiate between types of back refs. | |
906 | * There are different meanings of the key offset for different types | |
907 | * of back refs. | |
908 | * | |
d8d5f3e1 CM |
909 | * File extents can be referenced by: |
910 | * | |
911 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 912 | * - different files inside a single subvolume |
d8d5f3e1 CM |
913 | * - different offsets inside a file (bookend extents in file.c) |
914 | * | |
5d4f98a2 | 915 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
916 | * |
917 | * - Objectid of the subvolume root | |
d8d5f3e1 | 918 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
919 | * - original offset in the file |
920 | * - how many bookend extents | |
d8d5f3e1 | 921 | * |
5d4f98a2 YZ |
922 | * The key offset for the implicit back refs is hash of the first |
923 | * three fields. | |
d8d5f3e1 | 924 | * |
5d4f98a2 | 925 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 926 | * |
5d4f98a2 | 927 | * - number of pointers in the tree leaf |
d8d5f3e1 | 928 | * |
5d4f98a2 YZ |
929 | * The key offset for the implicit back refs is the first byte of |
930 | * the tree leaf | |
d8d5f3e1 | 931 | * |
5d4f98a2 YZ |
932 | * When a file extent is allocated, The implicit back refs is used. |
933 | * the fields are filled in: | |
d8d5f3e1 | 934 | * |
5d4f98a2 | 935 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 936 | * |
5d4f98a2 YZ |
937 | * When a file extent is removed file truncation, we find the |
938 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 939 | * |
5d4f98a2 | 940 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 941 | * |
5d4f98a2 | 942 | * Btree extents can be referenced by: |
d8d5f3e1 | 943 | * |
5d4f98a2 | 944 | * - Different subvolumes |
d8d5f3e1 | 945 | * |
5d4f98a2 YZ |
946 | * Both the implicit back refs and the full back refs for tree blocks |
947 | * only consist of key. The key offset for the implicit back refs is | |
948 | * objectid of block's owner tree. The key offset for the full back refs | |
949 | * is the first byte of parent block. | |
d8d5f3e1 | 950 | * |
5d4f98a2 YZ |
951 | * When implicit back refs is used, information about the lowest key and |
952 | * level of the tree block are required. These information are stored in | |
953 | * tree block info structure. | |
d8d5f3e1 | 954 | */ |
31840ae1 | 955 | |
5d4f98a2 YZ |
956 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
957 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
958 | struct btrfs_root *root, | |
959 | struct btrfs_path *path, | |
960 | u64 owner, u32 extra_size) | |
7bb86316 | 961 | { |
5d4f98a2 YZ |
962 | struct btrfs_extent_item *item; |
963 | struct btrfs_extent_item_v0 *ei0; | |
964 | struct btrfs_extent_ref_v0 *ref0; | |
965 | struct btrfs_tree_block_info *bi; | |
966 | struct extent_buffer *leaf; | |
7bb86316 | 967 | struct btrfs_key key; |
5d4f98a2 YZ |
968 | struct btrfs_key found_key; |
969 | u32 new_size = sizeof(*item); | |
970 | u64 refs; | |
971 | int ret; | |
972 | ||
973 | leaf = path->nodes[0]; | |
974 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
975 | ||
976 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
977 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
978 | struct btrfs_extent_item_v0); | |
979 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
980 | ||
981 | if (owner == (u64)-1) { | |
982 | while (1) { | |
983 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
984 | ret = btrfs_next_leaf(root, path); | |
985 | if (ret < 0) | |
986 | return ret; | |
79787eaa | 987 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
988 | leaf = path->nodes[0]; |
989 | } | |
990 | btrfs_item_key_to_cpu(leaf, &found_key, | |
991 | path->slots[0]); | |
992 | BUG_ON(key.objectid != found_key.objectid); | |
993 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
994 | path->slots[0]++; | |
995 | continue; | |
996 | } | |
997 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
998 | struct btrfs_extent_ref_v0); | |
999 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1000 | break; | |
1001 | } | |
1002 | } | |
b3b4aa74 | 1003 | btrfs_release_path(path); |
5d4f98a2 YZ |
1004 | |
1005 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1006 | new_size += sizeof(*bi); | |
1007 | ||
1008 | new_size -= sizeof(*ei0); | |
1009 | ret = btrfs_search_slot(trans, root, &key, path, | |
1010 | new_size + extra_size, 1); | |
1011 | if (ret < 0) | |
1012 | return ret; | |
79787eaa | 1013 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1014 | |
4b90c680 | 1015 | btrfs_extend_item(root, path, new_size); |
5d4f98a2 YZ |
1016 | |
1017 | leaf = path->nodes[0]; | |
1018 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1019 | btrfs_set_extent_refs(leaf, item, refs); | |
1020 | /* FIXME: get real generation */ | |
1021 | btrfs_set_extent_generation(leaf, item, 0); | |
1022 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1023 | btrfs_set_extent_flags(leaf, item, | |
1024 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1025 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1026 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1027 | /* FIXME: get first key of the block */ | |
1028 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1029 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1030 | } else { | |
1031 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1032 | } | |
1033 | btrfs_mark_buffer_dirty(leaf); | |
1034 | return 0; | |
1035 | } | |
1036 | #endif | |
1037 | ||
1038 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1039 | { | |
1040 | u32 high_crc = ~(u32)0; | |
1041 | u32 low_crc = ~(u32)0; | |
1042 | __le64 lenum; | |
1043 | ||
1044 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1045 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1046 | lenum = cpu_to_le64(owner); |
163e783e | 1047 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1048 | lenum = cpu_to_le64(offset); |
163e783e | 1049 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1050 | |
1051 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1052 | } | |
1053 | ||
1054 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1055 | struct btrfs_extent_data_ref *ref) | |
1056 | { | |
1057 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1058 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1059 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1060 | } | |
1061 | ||
1062 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1063 | struct btrfs_extent_data_ref *ref, | |
1064 | u64 root_objectid, u64 owner, u64 offset) | |
1065 | { | |
1066 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1067 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1068 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1069 | return 0; | |
1070 | return 1; | |
1071 | } | |
1072 | ||
1073 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1074 | struct btrfs_root *root, | |
1075 | struct btrfs_path *path, | |
1076 | u64 bytenr, u64 parent, | |
1077 | u64 root_objectid, | |
1078 | u64 owner, u64 offset) | |
1079 | { | |
1080 | struct btrfs_key key; | |
1081 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1082 | struct extent_buffer *leaf; |
5d4f98a2 | 1083 | u32 nritems; |
74493f7a | 1084 | int ret; |
5d4f98a2 YZ |
1085 | int recow; |
1086 | int err = -ENOENT; | |
74493f7a | 1087 | |
31840ae1 | 1088 | key.objectid = bytenr; |
5d4f98a2 YZ |
1089 | if (parent) { |
1090 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1091 | key.offset = parent; | |
1092 | } else { | |
1093 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1094 | key.offset = hash_extent_data_ref(root_objectid, | |
1095 | owner, offset); | |
1096 | } | |
1097 | again: | |
1098 | recow = 0; | |
1099 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1100 | if (ret < 0) { | |
1101 | err = ret; | |
1102 | goto fail; | |
1103 | } | |
31840ae1 | 1104 | |
5d4f98a2 YZ |
1105 | if (parent) { |
1106 | if (!ret) | |
1107 | return 0; | |
1108 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1109 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1110 | btrfs_release_path(path); |
5d4f98a2 YZ |
1111 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1112 | if (ret < 0) { | |
1113 | err = ret; | |
1114 | goto fail; | |
1115 | } | |
1116 | if (!ret) | |
1117 | return 0; | |
1118 | #endif | |
1119 | goto fail; | |
31840ae1 ZY |
1120 | } |
1121 | ||
1122 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1123 | nritems = btrfs_header_nritems(leaf); |
1124 | while (1) { | |
1125 | if (path->slots[0] >= nritems) { | |
1126 | ret = btrfs_next_leaf(root, path); | |
1127 | if (ret < 0) | |
1128 | err = ret; | |
1129 | if (ret) | |
1130 | goto fail; | |
1131 | ||
1132 | leaf = path->nodes[0]; | |
1133 | nritems = btrfs_header_nritems(leaf); | |
1134 | recow = 1; | |
1135 | } | |
1136 | ||
1137 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1138 | if (key.objectid != bytenr || | |
1139 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1140 | goto fail; | |
1141 | ||
1142 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1143 | struct btrfs_extent_data_ref); | |
1144 | ||
1145 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1146 | owner, offset)) { | |
1147 | if (recow) { | |
b3b4aa74 | 1148 | btrfs_release_path(path); |
5d4f98a2 YZ |
1149 | goto again; |
1150 | } | |
1151 | err = 0; | |
1152 | break; | |
1153 | } | |
1154 | path->slots[0]++; | |
31840ae1 | 1155 | } |
5d4f98a2 YZ |
1156 | fail: |
1157 | return err; | |
31840ae1 ZY |
1158 | } |
1159 | ||
5d4f98a2 YZ |
1160 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1161 | struct btrfs_root *root, | |
1162 | struct btrfs_path *path, | |
1163 | u64 bytenr, u64 parent, | |
1164 | u64 root_objectid, u64 owner, | |
1165 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1166 | { |
1167 | struct btrfs_key key; | |
1168 | struct extent_buffer *leaf; | |
5d4f98a2 | 1169 | u32 size; |
31840ae1 ZY |
1170 | u32 num_refs; |
1171 | int ret; | |
74493f7a | 1172 | |
74493f7a | 1173 | key.objectid = bytenr; |
5d4f98a2 YZ |
1174 | if (parent) { |
1175 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1176 | key.offset = parent; | |
1177 | size = sizeof(struct btrfs_shared_data_ref); | |
1178 | } else { | |
1179 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1180 | key.offset = hash_extent_data_ref(root_objectid, | |
1181 | owner, offset); | |
1182 | size = sizeof(struct btrfs_extent_data_ref); | |
1183 | } | |
74493f7a | 1184 | |
5d4f98a2 YZ |
1185 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1186 | if (ret && ret != -EEXIST) | |
1187 | goto fail; | |
1188 | ||
1189 | leaf = path->nodes[0]; | |
1190 | if (parent) { | |
1191 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1192 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1193 | struct btrfs_shared_data_ref); |
1194 | if (ret == 0) { | |
1195 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1196 | } else { | |
1197 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1198 | num_refs += refs_to_add; | |
1199 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1200 | } |
5d4f98a2 YZ |
1201 | } else { |
1202 | struct btrfs_extent_data_ref *ref; | |
1203 | while (ret == -EEXIST) { | |
1204 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1205 | struct btrfs_extent_data_ref); | |
1206 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1207 | owner, offset)) | |
1208 | break; | |
b3b4aa74 | 1209 | btrfs_release_path(path); |
5d4f98a2 YZ |
1210 | key.offset++; |
1211 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1212 | size); | |
1213 | if (ret && ret != -EEXIST) | |
1214 | goto fail; | |
31840ae1 | 1215 | |
5d4f98a2 YZ |
1216 | leaf = path->nodes[0]; |
1217 | } | |
1218 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1219 | struct btrfs_extent_data_ref); | |
1220 | if (ret == 0) { | |
1221 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1222 | root_objectid); | |
1223 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1224 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1225 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1226 | } else { | |
1227 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1228 | num_refs += refs_to_add; | |
1229 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1230 | } |
31840ae1 | 1231 | } |
5d4f98a2 YZ |
1232 | btrfs_mark_buffer_dirty(leaf); |
1233 | ret = 0; | |
1234 | fail: | |
b3b4aa74 | 1235 | btrfs_release_path(path); |
7bb86316 | 1236 | return ret; |
74493f7a CM |
1237 | } |
1238 | ||
5d4f98a2 YZ |
1239 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1240 | struct btrfs_root *root, | |
1241 | struct btrfs_path *path, | |
1242 | int refs_to_drop) | |
31840ae1 | 1243 | { |
5d4f98a2 YZ |
1244 | struct btrfs_key key; |
1245 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1246 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1247 | struct extent_buffer *leaf; |
5d4f98a2 | 1248 | u32 num_refs = 0; |
31840ae1 ZY |
1249 | int ret = 0; |
1250 | ||
1251 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1252 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1253 | ||
1254 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1255 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1256 | struct btrfs_extent_data_ref); | |
1257 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1258 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1259 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1260 | struct btrfs_shared_data_ref); | |
1261 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1262 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1263 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1264 | struct btrfs_extent_ref_v0 *ref0; | |
1265 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1266 | struct btrfs_extent_ref_v0); | |
1267 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1268 | #endif | |
1269 | } else { | |
1270 | BUG(); | |
1271 | } | |
1272 | ||
56bec294 CM |
1273 | BUG_ON(num_refs < refs_to_drop); |
1274 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1275 | |
31840ae1 ZY |
1276 | if (num_refs == 0) { |
1277 | ret = btrfs_del_item(trans, root, path); | |
1278 | } else { | |
5d4f98a2 YZ |
1279 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1280 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1281 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1282 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1283 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1284 | else { | |
1285 | struct btrfs_extent_ref_v0 *ref0; | |
1286 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1287 | struct btrfs_extent_ref_v0); | |
1288 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1289 | } | |
1290 | #endif | |
31840ae1 ZY |
1291 | btrfs_mark_buffer_dirty(leaf); |
1292 | } | |
31840ae1 ZY |
1293 | return ret; |
1294 | } | |
1295 | ||
5d4f98a2 YZ |
1296 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1297 | struct btrfs_path *path, | |
1298 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1299 | { |
5d4f98a2 YZ |
1300 | struct btrfs_key key; |
1301 | struct extent_buffer *leaf; | |
1302 | struct btrfs_extent_data_ref *ref1; | |
1303 | struct btrfs_shared_data_ref *ref2; | |
1304 | u32 num_refs = 0; | |
1305 | ||
1306 | leaf = path->nodes[0]; | |
1307 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1308 | if (iref) { | |
1309 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1310 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1311 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1312 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1313 | } else { | |
1314 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1315 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1316 | } | |
1317 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1318 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1319 | struct btrfs_extent_data_ref); | |
1320 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1321 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1322 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1323 | struct btrfs_shared_data_ref); | |
1324 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1325 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1326 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1327 | struct btrfs_extent_ref_v0 *ref0; | |
1328 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1329 | struct btrfs_extent_ref_v0); | |
1330 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1331 | #endif |
5d4f98a2 YZ |
1332 | } else { |
1333 | WARN_ON(1); | |
1334 | } | |
1335 | return num_refs; | |
1336 | } | |
15916de8 | 1337 | |
5d4f98a2 YZ |
1338 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1339 | struct btrfs_root *root, | |
1340 | struct btrfs_path *path, | |
1341 | u64 bytenr, u64 parent, | |
1342 | u64 root_objectid) | |
1f3c79a2 | 1343 | { |
5d4f98a2 | 1344 | struct btrfs_key key; |
1f3c79a2 | 1345 | int ret; |
1f3c79a2 | 1346 | |
5d4f98a2 YZ |
1347 | key.objectid = bytenr; |
1348 | if (parent) { | |
1349 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1350 | key.offset = parent; | |
1351 | } else { | |
1352 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1353 | key.offset = root_objectid; | |
1f3c79a2 LH |
1354 | } |
1355 | ||
5d4f98a2 YZ |
1356 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1357 | if (ret > 0) | |
1358 | ret = -ENOENT; | |
1359 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1360 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1361 | btrfs_release_path(path); |
5d4f98a2 YZ |
1362 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1363 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1364 | if (ret > 0) | |
1365 | ret = -ENOENT; | |
1366 | } | |
1f3c79a2 | 1367 | #endif |
5d4f98a2 | 1368 | return ret; |
1f3c79a2 LH |
1369 | } |
1370 | ||
5d4f98a2 YZ |
1371 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1372 | struct btrfs_root *root, | |
1373 | struct btrfs_path *path, | |
1374 | u64 bytenr, u64 parent, | |
1375 | u64 root_objectid) | |
31840ae1 | 1376 | { |
5d4f98a2 | 1377 | struct btrfs_key key; |
31840ae1 | 1378 | int ret; |
31840ae1 | 1379 | |
5d4f98a2 YZ |
1380 | key.objectid = bytenr; |
1381 | if (parent) { | |
1382 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1383 | key.offset = parent; | |
1384 | } else { | |
1385 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1386 | key.offset = root_objectid; | |
1387 | } | |
1388 | ||
1389 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1390 | btrfs_release_path(path); |
31840ae1 ZY |
1391 | return ret; |
1392 | } | |
1393 | ||
5d4f98a2 | 1394 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1395 | { |
5d4f98a2 YZ |
1396 | int type; |
1397 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1398 | if (parent > 0) | |
1399 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1400 | else | |
1401 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1402 | } else { | |
1403 | if (parent > 0) | |
1404 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1405 | else | |
1406 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1407 | } | |
1408 | return type; | |
31840ae1 | 1409 | } |
56bec294 | 1410 | |
2c47e605 YZ |
1411 | static int find_next_key(struct btrfs_path *path, int level, |
1412 | struct btrfs_key *key) | |
56bec294 | 1413 | |
02217ed2 | 1414 | { |
2c47e605 | 1415 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1416 | if (!path->nodes[level]) |
1417 | break; | |
5d4f98a2 YZ |
1418 | if (path->slots[level] + 1 >= |
1419 | btrfs_header_nritems(path->nodes[level])) | |
1420 | continue; | |
1421 | if (level == 0) | |
1422 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1423 | path->slots[level] + 1); | |
1424 | else | |
1425 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1426 | path->slots[level] + 1); | |
1427 | return 0; | |
1428 | } | |
1429 | return 1; | |
1430 | } | |
037e6390 | 1431 | |
5d4f98a2 YZ |
1432 | /* |
1433 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1434 | * to the address of inline back ref, and 0 is returned. | |
1435 | * | |
1436 | * if back ref isn't found, *ref_ret is set to the address where it | |
1437 | * should be inserted, and -ENOENT is returned. | |
1438 | * | |
1439 | * if insert is true and there are too many inline back refs, the path | |
1440 | * points to the extent item, and -EAGAIN is returned. | |
1441 | * | |
1442 | * NOTE: inline back refs are ordered in the same way that back ref | |
1443 | * items in the tree are ordered. | |
1444 | */ | |
1445 | static noinline_for_stack | |
1446 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1447 | struct btrfs_root *root, | |
1448 | struct btrfs_path *path, | |
1449 | struct btrfs_extent_inline_ref **ref_ret, | |
1450 | u64 bytenr, u64 num_bytes, | |
1451 | u64 parent, u64 root_objectid, | |
1452 | u64 owner, u64 offset, int insert) | |
1453 | { | |
1454 | struct btrfs_key key; | |
1455 | struct extent_buffer *leaf; | |
1456 | struct btrfs_extent_item *ei; | |
1457 | struct btrfs_extent_inline_ref *iref; | |
1458 | u64 flags; | |
1459 | u64 item_size; | |
1460 | unsigned long ptr; | |
1461 | unsigned long end; | |
1462 | int extra_size; | |
1463 | int type; | |
1464 | int want; | |
1465 | int ret; | |
1466 | int err = 0; | |
3173a18f JB |
1467 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
1468 | SKINNY_METADATA); | |
26b8003f | 1469 | |
db94535d | 1470 | key.objectid = bytenr; |
31840ae1 | 1471 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1472 | key.offset = num_bytes; |
31840ae1 | 1473 | |
5d4f98a2 YZ |
1474 | want = extent_ref_type(parent, owner); |
1475 | if (insert) { | |
1476 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1477 | path->keep_locks = 1; |
5d4f98a2 YZ |
1478 | } else |
1479 | extra_size = -1; | |
3173a18f JB |
1480 | |
1481 | /* | |
1482 | * Owner is our parent level, so we can just add one to get the level | |
1483 | * for the block we are interested in. | |
1484 | */ | |
1485 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1486 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1487 | key.offset = owner; | |
1488 | } | |
1489 | ||
1490 | again: | |
5d4f98a2 | 1491 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1492 | if (ret < 0) { |
5d4f98a2 YZ |
1493 | err = ret; |
1494 | goto out; | |
1495 | } | |
3173a18f JB |
1496 | |
1497 | /* | |
1498 | * We may be a newly converted file system which still has the old fat | |
1499 | * extent entries for metadata, so try and see if we have one of those. | |
1500 | */ | |
1501 | if (ret > 0 && skinny_metadata) { | |
1502 | skinny_metadata = false; | |
1503 | if (path->slots[0]) { | |
1504 | path->slots[0]--; | |
1505 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1506 | path->slots[0]); | |
1507 | if (key.objectid == bytenr && | |
1508 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1509 | key.offset == num_bytes) | |
1510 | ret = 0; | |
1511 | } | |
1512 | if (ret) { | |
1513 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1514 | key.offset = num_bytes; | |
1515 | btrfs_release_path(path); | |
1516 | goto again; | |
1517 | } | |
1518 | } | |
1519 | ||
79787eaa JM |
1520 | if (ret && !insert) { |
1521 | err = -ENOENT; | |
1522 | goto out; | |
492104c8 JB |
1523 | } else if (ret) { |
1524 | err = -EIO; | |
1525 | WARN_ON(1); | |
1526 | goto out; | |
79787eaa | 1527 | } |
5d4f98a2 YZ |
1528 | |
1529 | leaf = path->nodes[0]; | |
1530 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1531 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1532 | if (item_size < sizeof(*ei)) { | |
1533 | if (!insert) { | |
1534 | err = -ENOENT; | |
1535 | goto out; | |
1536 | } | |
1537 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1538 | extra_size); | |
1539 | if (ret < 0) { | |
1540 | err = ret; | |
1541 | goto out; | |
1542 | } | |
1543 | leaf = path->nodes[0]; | |
1544 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1545 | } | |
1546 | #endif | |
1547 | BUG_ON(item_size < sizeof(*ei)); | |
1548 | ||
5d4f98a2 YZ |
1549 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1550 | flags = btrfs_extent_flags(leaf, ei); | |
1551 | ||
1552 | ptr = (unsigned long)(ei + 1); | |
1553 | end = (unsigned long)ei + item_size; | |
1554 | ||
3173a18f | 1555 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
5d4f98a2 YZ |
1556 | ptr += sizeof(struct btrfs_tree_block_info); |
1557 | BUG_ON(ptr > end); | |
5d4f98a2 YZ |
1558 | } |
1559 | ||
1560 | err = -ENOENT; | |
1561 | while (1) { | |
1562 | if (ptr >= end) { | |
1563 | WARN_ON(ptr > end); | |
1564 | break; | |
1565 | } | |
1566 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1567 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1568 | if (want < type) | |
1569 | break; | |
1570 | if (want > type) { | |
1571 | ptr += btrfs_extent_inline_ref_size(type); | |
1572 | continue; | |
1573 | } | |
1574 | ||
1575 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1576 | struct btrfs_extent_data_ref *dref; | |
1577 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1578 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1579 | owner, offset)) { | |
1580 | err = 0; | |
1581 | break; | |
1582 | } | |
1583 | if (hash_extent_data_ref_item(leaf, dref) < | |
1584 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1585 | break; | |
1586 | } else { | |
1587 | u64 ref_offset; | |
1588 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1589 | if (parent > 0) { | |
1590 | if (parent == ref_offset) { | |
1591 | err = 0; | |
1592 | break; | |
1593 | } | |
1594 | if (ref_offset < parent) | |
1595 | break; | |
1596 | } else { | |
1597 | if (root_objectid == ref_offset) { | |
1598 | err = 0; | |
1599 | break; | |
1600 | } | |
1601 | if (ref_offset < root_objectid) | |
1602 | break; | |
1603 | } | |
1604 | } | |
1605 | ptr += btrfs_extent_inline_ref_size(type); | |
1606 | } | |
1607 | if (err == -ENOENT && insert) { | |
1608 | if (item_size + extra_size >= | |
1609 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1610 | err = -EAGAIN; | |
1611 | goto out; | |
1612 | } | |
1613 | /* | |
1614 | * To add new inline back ref, we have to make sure | |
1615 | * there is no corresponding back ref item. | |
1616 | * For simplicity, we just do not add new inline back | |
1617 | * ref if there is any kind of item for this block | |
1618 | */ | |
2c47e605 YZ |
1619 | if (find_next_key(path, 0, &key) == 0 && |
1620 | key.objectid == bytenr && | |
85d4198e | 1621 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1622 | err = -EAGAIN; |
1623 | goto out; | |
1624 | } | |
1625 | } | |
1626 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1627 | out: | |
85d4198e | 1628 | if (insert) { |
5d4f98a2 YZ |
1629 | path->keep_locks = 0; |
1630 | btrfs_unlock_up_safe(path, 1); | |
1631 | } | |
1632 | return err; | |
1633 | } | |
1634 | ||
1635 | /* | |
1636 | * helper to add new inline back ref | |
1637 | */ | |
1638 | static noinline_for_stack | |
fd279fae | 1639 | void setup_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1640 | struct btrfs_path *path, |
1641 | struct btrfs_extent_inline_ref *iref, | |
1642 | u64 parent, u64 root_objectid, | |
1643 | u64 owner, u64 offset, int refs_to_add, | |
1644 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1645 | { |
1646 | struct extent_buffer *leaf; | |
1647 | struct btrfs_extent_item *ei; | |
1648 | unsigned long ptr; | |
1649 | unsigned long end; | |
1650 | unsigned long item_offset; | |
1651 | u64 refs; | |
1652 | int size; | |
1653 | int type; | |
5d4f98a2 YZ |
1654 | |
1655 | leaf = path->nodes[0]; | |
1656 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1657 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1658 | ||
1659 | type = extent_ref_type(parent, owner); | |
1660 | size = btrfs_extent_inline_ref_size(type); | |
1661 | ||
4b90c680 | 1662 | btrfs_extend_item(root, path, size); |
5d4f98a2 YZ |
1663 | |
1664 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1665 | refs = btrfs_extent_refs(leaf, ei); | |
1666 | refs += refs_to_add; | |
1667 | btrfs_set_extent_refs(leaf, ei, refs); | |
1668 | if (extent_op) | |
1669 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1670 | ||
1671 | ptr = (unsigned long)ei + item_offset; | |
1672 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1673 | if (ptr < end - size) | |
1674 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1675 | end - size - ptr); | |
1676 | ||
1677 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1678 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1679 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1680 | struct btrfs_extent_data_ref *dref; | |
1681 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1682 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1683 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1684 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1685 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1686 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1687 | struct btrfs_shared_data_ref *sref; | |
1688 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1689 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1690 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1691 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1692 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1693 | } else { | |
1694 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1695 | } | |
1696 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1697 | } |
1698 | ||
1699 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1700 | struct btrfs_root *root, | |
1701 | struct btrfs_path *path, | |
1702 | struct btrfs_extent_inline_ref **ref_ret, | |
1703 | u64 bytenr, u64 num_bytes, u64 parent, | |
1704 | u64 root_objectid, u64 owner, u64 offset) | |
1705 | { | |
1706 | int ret; | |
1707 | ||
1708 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1709 | bytenr, num_bytes, parent, | |
1710 | root_objectid, owner, offset, 0); | |
1711 | if (ret != -ENOENT) | |
54aa1f4d | 1712 | return ret; |
5d4f98a2 | 1713 | |
b3b4aa74 | 1714 | btrfs_release_path(path); |
5d4f98a2 YZ |
1715 | *ref_ret = NULL; |
1716 | ||
1717 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1718 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1719 | root_objectid); | |
1720 | } else { | |
1721 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1722 | root_objectid, owner, offset); | |
b9473439 | 1723 | } |
5d4f98a2 YZ |
1724 | return ret; |
1725 | } | |
31840ae1 | 1726 | |
5d4f98a2 YZ |
1727 | /* |
1728 | * helper to update/remove inline back ref | |
1729 | */ | |
1730 | static noinline_for_stack | |
afe5fea7 | 1731 | void update_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1732 | struct btrfs_path *path, |
1733 | struct btrfs_extent_inline_ref *iref, | |
1734 | int refs_to_mod, | |
1735 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1736 | { |
1737 | struct extent_buffer *leaf; | |
1738 | struct btrfs_extent_item *ei; | |
1739 | struct btrfs_extent_data_ref *dref = NULL; | |
1740 | struct btrfs_shared_data_ref *sref = NULL; | |
1741 | unsigned long ptr; | |
1742 | unsigned long end; | |
1743 | u32 item_size; | |
1744 | int size; | |
1745 | int type; | |
5d4f98a2 YZ |
1746 | u64 refs; |
1747 | ||
1748 | leaf = path->nodes[0]; | |
1749 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1750 | refs = btrfs_extent_refs(leaf, ei); | |
1751 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1752 | refs += refs_to_mod; | |
1753 | btrfs_set_extent_refs(leaf, ei, refs); | |
1754 | if (extent_op) | |
1755 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1756 | ||
1757 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1758 | ||
1759 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1760 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1761 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1762 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1763 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1764 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1765 | } else { | |
1766 | refs = 1; | |
1767 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1768 | } |
31840ae1 | 1769 | |
5d4f98a2 YZ |
1770 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1771 | refs += refs_to_mod; | |
1772 | ||
1773 | if (refs > 0) { | |
1774 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1775 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1776 | else | |
1777 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1778 | } else { | |
1779 | size = btrfs_extent_inline_ref_size(type); | |
1780 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1781 | ptr = (unsigned long)iref; | |
1782 | end = (unsigned long)ei + item_size; | |
1783 | if (ptr + size < end) | |
1784 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1785 | end - ptr - size); | |
1786 | item_size -= size; | |
afe5fea7 | 1787 | btrfs_truncate_item(root, path, item_size, 1); |
5d4f98a2 YZ |
1788 | } |
1789 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1790 | } |
1791 | ||
1792 | static noinline_for_stack | |
1793 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1794 | struct btrfs_root *root, | |
1795 | struct btrfs_path *path, | |
1796 | u64 bytenr, u64 num_bytes, u64 parent, | |
1797 | u64 root_objectid, u64 owner, | |
1798 | u64 offset, int refs_to_add, | |
1799 | struct btrfs_delayed_extent_op *extent_op) | |
1800 | { | |
1801 | struct btrfs_extent_inline_ref *iref; | |
1802 | int ret; | |
1803 | ||
1804 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1805 | bytenr, num_bytes, parent, | |
1806 | root_objectid, owner, offset, 1); | |
1807 | if (ret == 0) { | |
1808 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
afe5fea7 | 1809 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1810 | refs_to_add, extent_op); |
5d4f98a2 | 1811 | } else if (ret == -ENOENT) { |
fd279fae | 1812 | setup_inline_extent_backref(root, path, iref, parent, |
143bede5 JM |
1813 | root_objectid, owner, offset, |
1814 | refs_to_add, extent_op); | |
1815 | ret = 0; | |
771ed689 | 1816 | } |
5d4f98a2 YZ |
1817 | return ret; |
1818 | } | |
31840ae1 | 1819 | |
5d4f98a2 YZ |
1820 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1821 | struct btrfs_root *root, | |
1822 | struct btrfs_path *path, | |
1823 | u64 bytenr, u64 parent, u64 root_objectid, | |
1824 | u64 owner, u64 offset, int refs_to_add) | |
1825 | { | |
1826 | int ret; | |
1827 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1828 | BUG_ON(refs_to_add != 1); | |
1829 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1830 | parent, root_objectid); | |
1831 | } else { | |
1832 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1833 | parent, root_objectid, | |
1834 | owner, offset, refs_to_add); | |
1835 | } | |
1836 | return ret; | |
1837 | } | |
56bec294 | 1838 | |
5d4f98a2 YZ |
1839 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1840 | struct btrfs_root *root, | |
1841 | struct btrfs_path *path, | |
1842 | struct btrfs_extent_inline_ref *iref, | |
1843 | int refs_to_drop, int is_data) | |
1844 | { | |
143bede5 | 1845 | int ret = 0; |
b9473439 | 1846 | |
5d4f98a2 YZ |
1847 | BUG_ON(!is_data && refs_to_drop != 1); |
1848 | if (iref) { | |
afe5fea7 | 1849 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1850 | -refs_to_drop, NULL); |
5d4f98a2 YZ |
1851 | } else if (is_data) { |
1852 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1853 | } else { | |
1854 | ret = btrfs_del_item(trans, root, path); | |
1855 | } | |
1856 | return ret; | |
1857 | } | |
1858 | ||
5378e607 | 1859 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1860 | u64 start, u64 len) |
1861 | { | |
5378e607 | 1862 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1863 | } |
5d4f98a2 YZ |
1864 | |
1865 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1866 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1867 | { |
5d4f98a2 | 1868 | int ret; |
5378e607 | 1869 | u64 discarded_bytes = 0; |
a1d3c478 | 1870 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1871 | |
e244a0ae | 1872 | |
5d4f98a2 | 1873 | /* Tell the block device(s) that the sectors can be discarded */ |
3ec706c8 | 1874 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
a1d3c478 | 1875 | bytenr, &num_bytes, &bbio, 0); |
79787eaa | 1876 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1877 | if (!ret) { |
a1d3c478 | 1878 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1879 | int i; |
1880 | ||
5d4f98a2 | 1881 | |
a1d3c478 | 1882 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d5e2003c JB |
1883 | if (!stripe->dev->can_discard) |
1884 | continue; | |
1885 | ||
5378e607 LD |
1886 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1887 | stripe->physical, | |
1888 | stripe->length); | |
1889 | if (!ret) | |
1890 | discarded_bytes += stripe->length; | |
1891 | else if (ret != -EOPNOTSUPP) | |
79787eaa | 1892 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
1893 | |
1894 | /* | |
1895 | * Just in case we get back EOPNOTSUPP for some reason, | |
1896 | * just ignore the return value so we don't screw up | |
1897 | * people calling discard_extent. | |
1898 | */ | |
1899 | ret = 0; | |
5d4f98a2 | 1900 | } |
a1d3c478 | 1901 | kfree(bbio); |
5d4f98a2 | 1902 | } |
5378e607 LD |
1903 | |
1904 | if (actual_bytes) | |
1905 | *actual_bytes = discarded_bytes; | |
1906 | ||
5d4f98a2 | 1907 | |
53b381b3 DW |
1908 | if (ret == -EOPNOTSUPP) |
1909 | ret = 0; | |
5d4f98a2 | 1910 | return ret; |
5d4f98a2 YZ |
1911 | } |
1912 | ||
79787eaa | 1913 | /* Can return -ENOMEM */ |
5d4f98a2 YZ |
1914 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
1915 | struct btrfs_root *root, | |
1916 | u64 bytenr, u64 num_bytes, u64 parent, | |
66d7e7f0 | 1917 | u64 root_objectid, u64 owner, u64 offset, int for_cow) |
5d4f98a2 YZ |
1918 | { |
1919 | int ret; | |
66d7e7f0 AJ |
1920 | struct btrfs_fs_info *fs_info = root->fs_info; |
1921 | ||
5d4f98a2 YZ |
1922 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
1923 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1924 | ||
1925 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
66d7e7f0 AJ |
1926 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
1927 | num_bytes, | |
5d4f98a2 | 1928 | parent, root_objectid, (int)owner, |
66d7e7f0 | 1929 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 1930 | } else { |
66d7e7f0 AJ |
1931 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
1932 | num_bytes, | |
5d4f98a2 | 1933 | parent, root_objectid, owner, offset, |
66d7e7f0 | 1934 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 YZ |
1935 | } |
1936 | return ret; | |
1937 | } | |
1938 | ||
1939 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1940 | struct btrfs_root *root, | |
1941 | u64 bytenr, u64 num_bytes, | |
1942 | u64 parent, u64 root_objectid, | |
1943 | u64 owner, u64 offset, int refs_to_add, | |
1944 | struct btrfs_delayed_extent_op *extent_op) | |
1945 | { | |
1946 | struct btrfs_path *path; | |
1947 | struct extent_buffer *leaf; | |
1948 | struct btrfs_extent_item *item; | |
1949 | u64 refs; | |
1950 | int ret; | |
1951 | int err = 0; | |
1952 | ||
1953 | path = btrfs_alloc_path(); | |
1954 | if (!path) | |
1955 | return -ENOMEM; | |
1956 | ||
1957 | path->reada = 1; | |
1958 | path->leave_spinning = 1; | |
1959 | /* this will setup the path even if it fails to insert the back ref */ | |
1960 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1961 | path, bytenr, num_bytes, parent, | |
1962 | root_objectid, owner, offset, | |
1963 | refs_to_add, extent_op); | |
1964 | if (ret == 0) | |
1965 | goto out; | |
1966 | ||
1967 | if (ret != -EAGAIN) { | |
1968 | err = ret; | |
1969 | goto out; | |
1970 | } | |
1971 | ||
1972 | leaf = path->nodes[0]; | |
1973 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1974 | refs = btrfs_extent_refs(leaf, item); | |
1975 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1976 | if (extent_op) | |
1977 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1978 | |
5d4f98a2 | 1979 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 1980 | btrfs_release_path(path); |
56bec294 CM |
1981 | |
1982 | path->reada = 1; | |
b9473439 CM |
1983 | path->leave_spinning = 1; |
1984 | ||
56bec294 CM |
1985 | /* now insert the actual backref */ |
1986 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1987 | path, bytenr, parent, root_objectid, |
1988 | owner, offset, refs_to_add); | |
79787eaa JM |
1989 | if (ret) |
1990 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 1991 | out: |
56bec294 | 1992 | btrfs_free_path(path); |
5d4f98a2 | 1993 | return err; |
56bec294 CM |
1994 | } |
1995 | ||
5d4f98a2 YZ |
1996 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1997 | struct btrfs_root *root, | |
1998 | struct btrfs_delayed_ref_node *node, | |
1999 | struct btrfs_delayed_extent_op *extent_op, | |
2000 | int insert_reserved) | |
56bec294 | 2001 | { |
5d4f98a2 YZ |
2002 | int ret = 0; |
2003 | struct btrfs_delayed_data_ref *ref; | |
2004 | struct btrfs_key ins; | |
2005 | u64 parent = 0; | |
2006 | u64 ref_root = 0; | |
2007 | u64 flags = 0; | |
2008 | ||
2009 | ins.objectid = node->bytenr; | |
2010 | ins.offset = node->num_bytes; | |
2011 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2012 | ||
2013 | ref = btrfs_delayed_node_to_data_ref(node); | |
2014 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2015 | parent = ref->parent; | |
2016 | else | |
2017 | ref_root = ref->root; | |
2018 | ||
2019 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2020 | if (extent_op) |
5d4f98a2 | 2021 | flags |= extent_op->flags_to_set; |
5d4f98a2 YZ |
2022 | ret = alloc_reserved_file_extent(trans, root, |
2023 | parent, ref_root, flags, | |
2024 | ref->objectid, ref->offset, | |
2025 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
2026 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2027 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2028 | node->num_bytes, parent, | |
2029 | ref_root, ref->objectid, | |
2030 | ref->offset, node->ref_mod, | |
2031 | extent_op); | |
2032 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2033 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2034 | node->num_bytes, parent, | |
2035 | ref_root, ref->objectid, | |
2036 | ref->offset, node->ref_mod, | |
2037 | extent_op); | |
2038 | } else { | |
2039 | BUG(); | |
2040 | } | |
2041 | return ret; | |
2042 | } | |
2043 | ||
2044 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2045 | struct extent_buffer *leaf, | |
2046 | struct btrfs_extent_item *ei) | |
2047 | { | |
2048 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2049 | if (extent_op->update_flags) { | |
2050 | flags |= extent_op->flags_to_set; | |
2051 | btrfs_set_extent_flags(leaf, ei, flags); | |
2052 | } | |
2053 | ||
2054 | if (extent_op->update_key) { | |
2055 | struct btrfs_tree_block_info *bi; | |
2056 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2057 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2058 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2059 | } | |
2060 | } | |
2061 | ||
2062 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2063 | struct btrfs_root *root, | |
2064 | struct btrfs_delayed_ref_node *node, | |
2065 | struct btrfs_delayed_extent_op *extent_op) | |
2066 | { | |
2067 | struct btrfs_key key; | |
2068 | struct btrfs_path *path; | |
2069 | struct btrfs_extent_item *ei; | |
2070 | struct extent_buffer *leaf; | |
2071 | u32 item_size; | |
56bec294 | 2072 | int ret; |
5d4f98a2 | 2073 | int err = 0; |
b1c79e09 | 2074 | int metadata = !extent_op->is_data; |
5d4f98a2 | 2075 | |
79787eaa JM |
2076 | if (trans->aborted) |
2077 | return 0; | |
2078 | ||
3173a18f JB |
2079 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
2080 | metadata = 0; | |
2081 | ||
5d4f98a2 YZ |
2082 | path = btrfs_alloc_path(); |
2083 | if (!path) | |
2084 | return -ENOMEM; | |
2085 | ||
2086 | key.objectid = node->bytenr; | |
5d4f98a2 | 2087 | |
3173a18f | 2088 | if (metadata) { |
3173a18f | 2089 | key.type = BTRFS_METADATA_ITEM_KEY; |
b1c79e09 | 2090 | key.offset = extent_op->level; |
3173a18f JB |
2091 | } else { |
2092 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2093 | key.offset = node->num_bytes; | |
2094 | } | |
2095 | ||
2096 | again: | |
5d4f98a2 YZ |
2097 | path->reada = 1; |
2098 | path->leave_spinning = 1; | |
2099 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2100 | path, 0, 1); | |
2101 | if (ret < 0) { | |
2102 | err = ret; | |
2103 | goto out; | |
2104 | } | |
2105 | if (ret > 0) { | |
3173a18f JB |
2106 | if (metadata) { |
2107 | btrfs_release_path(path); | |
2108 | metadata = 0; | |
2109 | ||
2110 | key.offset = node->num_bytes; | |
2111 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2112 | goto again; | |
2113 | } | |
5d4f98a2 YZ |
2114 | err = -EIO; |
2115 | goto out; | |
2116 | } | |
2117 | ||
2118 | leaf = path->nodes[0]; | |
2119 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2120 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2121 | if (item_size < sizeof(*ei)) { | |
2122 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2123 | path, (u64)-1, 0); | |
2124 | if (ret < 0) { | |
2125 | err = ret; | |
2126 | goto out; | |
2127 | } | |
2128 | leaf = path->nodes[0]; | |
2129 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2130 | } | |
2131 | #endif | |
2132 | BUG_ON(item_size < sizeof(*ei)); | |
2133 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2134 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2135 | |
5d4f98a2 YZ |
2136 | btrfs_mark_buffer_dirty(leaf); |
2137 | out: | |
2138 | btrfs_free_path(path); | |
2139 | return err; | |
56bec294 CM |
2140 | } |
2141 | ||
5d4f98a2 YZ |
2142 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2143 | struct btrfs_root *root, | |
2144 | struct btrfs_delayed_ref_node *node, | |
2145 | struct btrfs_delayed_extent_op *extent_op, | |
2146 | int insert_reserved) | |
56bec294 CM |
2147 | { |
2148 | int ret = 0; | |
5d4f98a2 YZ |
2149 | struct btrfs_delayed_tree_ref *ref; |
2150 | struct btrfs_key ins; | |
2151 | u64 parent = 0; | |
2152 | u64 ref_root = 0; | |
3173a18f JB |
2153 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
2154 | SKINNY_METADATA); | |
56bec294 | 2155 | |
5d4f98a2 YZ |
2156 | ref = btrfs_delayed_node_to_tree_ref(node); |
2157 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2158 | parent = ref->parent; | |
2159 | else | |
2160 | ref_root = ref->root; | |
2161 | ||
3173a18f JB |
2162 | ins.objectid = node->bytenr; |
2163 | if (skinny_metadata) { | |
2164 | ins.offset = ref->level; | |
2165 | ins.type = BTRFS_METADATA_ITEM_KEY; | |
2166 | } else { | |
2167 | ins.offset = node->num_bytes; | |
2168 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2169 | } | |
2170 | ||
5d4f98a2 YZ |
2171 | BUG_ON(node->ref_mod != 1); |
2172 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2173 | BUG_ON(!extent_op || !extent_op->update_flags); |
5d4f98a2 YZ |
2174 | ret = alloc_reserved_tree_block(trans, root, |
2175 | parent, ref_root, | |
2176 | extent_op->flags_to_set, | |
2177 | &extent_op->key, | |
2178 | ref->level, &ins); | |
5d4f98a2 YZ |
2179 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2180 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2181 | node->num_bytes, parent, ref_root, | |
2182 | ref->level, 0, 1, extent_op); | |
2183 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2184 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2185 | node->num_bytes, parent, ref_root, | |
2186 | ref->level, 0, 1, extent_op); | |
2187 | } else { | |
2188 | BUG(); | |
2189 | } | |
56bec294 CM |
2190 | return ret; |
2191 | } | |
2192 | ||
2193 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2194 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2195 | struct btrfs_root *root, | |
2196 | struct btrfs_delayed_ref_node *node, | |
2197 | struct btrfs_delayed_extent_op *extent_op, | |
2198 | int insert_reserved) | |
56bec294 | 2199 | { |
79787eaa JM |
2200 | int ret = 0; |
2201 | ||
2202 | if (trans->aborted) | |
2203 | return 0; | |
2204 | ||
5d4f98a2 | 2205 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2206 | struct btrfs_delayed_ref_head *head; |
2207 | /* | |
2208 | * we've hit the end of the chain and we were supposed | |
2209 | * to insert this extent into the tree. But, it got | |
2210 | * deleted before we ever needed to insert it, so all | |
2211 | * we have to do is clean up the accounting | |
2212 | */ | |
5d4f98a2 YZ |
2213 | BUG_ON(extent_op); |
2214 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2215 | if (insert_reserved) { |
f0486c68 YZ |
2216 | btrfs_pin_extent(root, node->bytenr, |
2217 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2218 | if (head->is_data) { |
2219 | ret = btrfs_del_csums(trans, root, | |
2220 | node->bytenr, | |
2221 | node->num_bytes); | |
5d4f98a2 | 2222 | } |
56bec294 | 2223 | } |
79787eaa | 2224 | return ret; |
56bec294 CM |
2225 | } |
2226 | ||
5d4f98a2 YZ |
2227 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2228 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2229 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2230 | insert_reserved); | |
2231 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2232 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2233 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2234 | insert_reserved); | |
2235 | else | |
2236 | BUG(); | |
2237 | return ret; | |
56bec294 CM |
2238 | } |
2239 | ||
2240 | static noinline struct btrfs_delayed_ref_node * | |
2241 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2242 | { | |
2243 | struct rb_node *node; | |
2244 | struct btrfs_delayed_ref_node *ref; | |
2245 | int action = BTRFS_ADD_DELAYED_REF; | |
2246 | again: | |
2247 | /* | |
2248 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2249 | * this prevents ref count from going down to zero when | |
2250 | * there still are pending delayed ref. | |
2251 | */ | |
2252 | node = rb_prev(&head->node.rb_node); | |
2253 | while (1) { | |
2254 | if (!node) | |
2255 | break; | |
2256 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2257 | rb_node); | |
2258 | if (ref->bytenr != head->node.bytenr) | |
2259 | break; | |
5d4f98a2 | 2260 | if (ref->action == action) |
56bec294 CM |
2261 | return ref; |
2262 | node = rb_prev(node); | |
2263 | } | |
2264 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2265 | action = BTRFS_DROP_DELAYED_REF; | |
2266 | goto again; | |
2267 | } | |
2268 | return NULL; | |
2269 | } | |
2270 | ||
79787eaa JM |
2271 | /* |
2272 | * Returns 0 on success or if called with an already aborted transaction. | |
2273 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2274 | */ | |
c3e69d58 CM |
2275 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2276 | struct btrfs_root *root, | |
2277 | struct list_head *cluster) | |
56bec294 | 2278 | { |
56bec294 CM |
2279 | struct btrfs_delayed_ref_root *delayed_refs; |
2280 | struct btrfs_delayed_ref_node *ref; | |
2281 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2282 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2283 | struct btrfs_fs_info *fs_info = root->fs_info; |
56bec294 | 2284 | int ret; |
c3e69d58 | 2285 | int count = 0; |
56bec294 | 2286 | int must_insert_reserved = 0; |
56bec294 CM |
2287 | |
2288 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2289 | while (1) { |
2290 | if (!locked_ref) { | |
c3e69d58 CM |
2291 | /* pick a new head ref from the cluster list */ |
2292 | if (list_empty(cluster)) | |
56bec294 | 2293 | break; |
56bec294 | 2294 | |
c3e69d58 CM |
2295 | locked_ref = list_entry(cluster->next, |
2296 | struct btrfs_delayed_ref_head, cluster); | |
2297 | ||
2298 | /* grab the lock that says we are going to process | |
2299 | * all the refs for this head */ | |
2300 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2301 | ||
2302 | /* | |
2303 | * we may have dropped the spin lock to get the head | |
2304 | * mutex lock, and that might have given someone else | |
2305 | * time to free the head. If that's true, it has been | |
2306 | * removed from our list and we can move on. | |
2307 | */ | |
2308 | if (ret == -EAGAIN) { | |
2309 | locked_ref = NULL; | |
2310 | count++; | |
2311 | continue; | |
56bec294 CM |
2312 | } |
2313 | } | |
a28ec197 | 2314 | |
ae1e206b JB |
2315 | /* |
2316 | * We need to try and merge add/drops of the same ref since we | |
2317 | * can run into issues with relocate dropping the implicit ref | |
2318 | * and then it being added back again before the drop can | |
2319 | * finish. If we merged anything we need to re-loop so we can | |
2320 | * get a good ref. | |
2321 | */ | |
2322 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, | |
2323 | locked_ref); | |
2324 | ||
d1270cd9 AJ |
2325 | /* |
2326 | * locked_ref is the head node, so we have to go one | |
2327 | * node back for any delayed ref updates | |
2328 | */ | |
2329 | ref = select_delayed_ref(locked_ref); | |
2330 | ||
2331 | if (ref && ref->seq && | |
097b8a7c | 2332 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d1270cd9 AJ |
2333 | /* |
2334 | * there are still refs with lower seq numbers in the | |
2335 | * process of being added. Don't run this ref yet. | |
2336 | */ | |
2337 | list_del_init(&locked_ref->cluster); | |
093486c4 | 2338 | btrfs_delayed_ref_unlock(locked_ref); |
d1270cd9 AJ |
2339 | locked_ref = NULL; |
2340 | delayed_refs->num_heads_ready++; | |
2341 | spin_unlock(&delayed_refs->lock); | |
2342 | cond_resched(); | |
2343 | spin_lock(&delayed_refs->lock); | |
2344 | continue; | |
2345 | } | |
2346 | ||
56bec294 CM |
2347 | /* |
2348 | * record the must insert reserved flag before we | |
2349 | * drop the spin lock. | |
2350 | */ | |
2351 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2352 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2353 | |
5d4f98a2 YZ |
2354 | extent_op = locked_ref->extent_op; |
2355 | locked_ref->extent_op = NULL; | |
2356 | ||
56bec294 CM |
2357 | if (!ref) { |
2358 | /* All delayed refs have been processed, Go ahead | |
2359 | * and send the head node to run_one_delayed_ref, | |
2360 | * so that any accounting fixes can happen | |
2361 | */ | |
2362 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2363 | |
2364 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2365 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2366 | extent_op = NULL; |
2367 | } | |
2368 | ||
2369 | if (extent_op) { | |
2370 | spin_unlock(&delayed_refs->lock); | |
2371 | ||
2372 | ret = run_delayed_extent_op(trans, root, | |
2373 | ref, extent_op); | |
78a6184a | 2374 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2375 | |
79787eaa | 2376 | if (ret) { |
c2cf52eb | 2377 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
253beebd | 2378 | spin_lock(&delayed_refs->lock); |
093486c4 | 2379 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2380 | return ret; |
2381 | } | |
2382 | ||
203bf287 | 2383 | goto next; |
5d4f98a2 | 2384 | } |
56bec294 | 2385 | } |
02217ed2 | 2386 | |
56bec294 CM |
2387 | ref->in_tree = 0; |
2388 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2389 | delayed_refs->num_entries--; | |
093486c4 | 2390 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2391 | /* |
2392 | * when we play the delayed ref, also correct the | |
2393 | * ref_mod on head | |
2394 | */ | |
2395 | switch (ref->action) { | |
2396 | case BTRFS_ADD_DELAYED_REF: | |
2397 | case BTRFS_ADD_DELAYED_EXTENT: | |
2398 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2399 | break; | |
2400 | case BTRFS_DROP_DELAYED_REF: | |
2401 | locked_ref->node.ref_mod += ref->ref_mod; | |
2402 | break; | |
2403 | default: | |
2404 | WARN_ON(1); | |
2405 | } | |
2406 | } | |
56bec294 | 2407 | spin_unlock(&delayed_refs->lock); |
925baedd | 2408 | |
5d4f98a2 | 2409 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2410 | must_insert_reserved); |
eb099670 | 2411 | |
78a6184a | 2412 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2413 | if (ret) { |
093486c4 MX |
2414 | btrfs_delayed_ref_unlock(locked_ref); |
2415 | btrfs_put_delayed_ref(ref); | |
c2cf52eb | 2416 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
253beebd | 2417 | spin_lock(&delayed_refs->lock); |
79787eaa JM |
2418 | return ret; |
2419 | } | |
2420 | ||
093486c4 MX |
2421 | /* |
2422 | * If this node is a head, that means all the refs in this head | |
2423 | * have been dealt with, and we will pick the next head to deal | |
2424 | * with, so we must unlock the head and drop it from the cluster | |
2425 | * list before we release it. | |
2426 | */ | |
2427 | if (btrfs_delayed_ref_is_head(ref)) { | |
2428 | list_del_init(&locked_ref->cluster); | |
2429 | btrfs_delayed_ref_unlock(locked_ref); | |
2430 | locked_ref = NULL; | |
2431 | } | |
2432 | btrfs_put_delayed_ref(ref); | |
2433 | count++; | |
203bf287 | 2434 | next: |
c3e69d58 CM |
2435 | cond_resched(); |
2436 | spin_lock(&delayed_refs->lock); | |
2437 | } | |
2438 | return count; | |
2439 | } | |
2440 | ||
709c0486 AJ |
2441 | #ifdef SCRAMBLE_DELAYED_REFS |
2442 | /* | |
2443 | * Normally delayed refs get processed in ascending bytenr order. This | |
2444 | * correlates in most cases to the order added. To expose dependencies on this | |
2445 | * order, we start to process the tree in the middle instead of the beginning | |
2446 | */ | |
2447 | static u64 find_middle(struct rb_root *root) | |
2448 | { | |
2449 | struct rb_node *n = root->rb_node; | |
2450 | struct btrfs_delayed_ref_node *entry; | |
2451 | int alt = 1; | |
2452 | u64 middle; | |
2453 | u64 first = 0, last = 0; | |
2454 | ||
2455 | n = rb_first(root); | |
2456 | if (n) { | |
2457 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2458 | first = entry->bytenr; | |
2459 | } | |
2460 | n = rb_last(root); | |
2461 | if (n) { | |
2462 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2463 | last = entry->bytenr; | |
2464 | } | |
2465 | n = root->rb_node; | |
2466 | ||
2467 | while (n) { | |
2468 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2469 | WARN_ON(!entry->in_tree); | |
2470 | ||
2471 | middle = entry->bytenr; | |
2472 | ||
2473 | if (alt) | |
2474 | n = n->rb_left; | |
2475 | else | |
2476 | n = n->rb_right; | |
2477 | ||
2478 | alt = 1 - alt; | |
2479 | } | |
2480 | return middle; | |
2481 | } | |
2482 | #endif | |
2483 | ||
bed92eae AJ |
2484 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
2485 | struct btrfs_fs_info *fs_info) | |
2486 | { | |
2487 | struct qgroup_update *qgroup_update; | |
2488 | int ret = 0; | |
2489 | ||
2490 | if (list_empty(&trans->qgroup_ref_list) != | |
2491 | !trans->delayed_ref_elem.seq) { | |
2492 | /* list without seq or seq without list */ | |
c2cf52eb | 2493 | btrfs_err(fs_info, |
fc36ed7e | 2494 | "qgroup accounting update error, list is%s empty, seq is %#x.%x", |
bed92eae | 2495 | list_empty(&trans->qgroup_ref_list) ? "" : " not", |
fc36ed7e JS |
2496 | (u32)(trans->delayed_ref_elem.seq >> 32), |
2497 | (u32)trans->delayed_ref_elem.seq); | |
bed92eae AJ |
2498 | BUG(); |
2499 | } | |
2500 | ||
2501 | if (!trans->delayed_ref_elem.seq) | |
2502 | return 0; | |
2503 | ||
2504 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2505 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, | |
2506 | struct qgroup_update, list); | |
2507 | list_del(&qgroup_update->list); | |
2508 | if (!ret) | |
2509 | ret = btrfs_qgroup_account_ref( | |
2510 | trans, fs_info, qgroup_update->node, | |
2511 | qgroup_update->extent_op); | |
2512 | kfree(qgroup_update); | |
2513 | } | |
2514 | ||
2515 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); | |
2516 | ||
2517 | return ret; | |
2518 | } | |
2519 | ||
bb721703 CM |
2520 | static int refs_newer(struct btrfs_delayed_ref_root *delayed_refs, int seq, |
2521 | int count) | |
2522 | { | |
2523 | int val = atomic_read(&delayed_refs->ref_seq); | |
2524 | ||
2525 | if (val < seq || val >= seq + count) | |
2526 | return 1; | |
2527 | return 0; | |
2528 | } | |
2529 | ||
1be41b78 JB |
2530 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
2531 | { | |
2532 | u64 num_bytes; | |
2533 | ||
2534 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2535 | sizeof(struct btrfs_extent_inline_ref)); | |
2536 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) | |
2537 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); | |
2538 | ||
2539 | /* | |
2540 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
2541 | * closer to what we're really going to want to ouse. | |
2542 | */ | |
2543 | return div64_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); | |
2544 | } | |
2545 | ||
2546 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, | |
2547 | struct btrfs_root *root) | |
2548 | { | |
2549 | struct btrfs_block_rsv *global_rsv; | |
2550 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
2551 | u64 num_bytes; | |
2552 | int ret = 0; | |
2553 | ||
2554 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
2555 | num_heads = heads_to_leaves(root, num_heads); | |
2556 | if (num_heads > 1) | |
2557 | num_bytes += (num_heads - 1) * root->leafsize; | |
2558 | num_bytes <<= 1; | |
2559 | global_rsv = &root->fs_info->global_block_rsv; | |
2560 | ||
2561 | /* | |
2562 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2563 | * wiggle room since running delayed refs can create more delayed refs. | |
2564 | */ | |
2565 | if (global_rsv->space_info->full) | |
2566 | num_bytes <<= 1; | |
2567 | ||
2568 | spin_lock(&global_rsv->lock); | |
2569 | if (global_rsv->reserved <= num_bytes) | |
2570 | ret = 1; | |
2571 | spin_unlock(&global_rsv->lock); | |
2572 | return ret; | |
2573 | } | |
2574 | ||
c3e69d58 CM |
2575 | /* |
2576 | * this starts processing the delayed reference count updates and | |
2577 | * extent insertions we have queued up so far. count can be | |
2578 | * 0, which means to process everything in the tree at the start | |
2579 | * of the run (but not newly added entries), or it can be some target | |
2580 | * number you'd like to process. | |
79787eaa JM |
2581 | * |
2582 | * Returns 0 on success or if called with an aborted transaction | |
2583 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2584 | */ |
2585 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2586 | struct btrfs_root *root, unsigned long count) | |
2587 | { | |
2588 | struct rb_node *node; | |
2589 | struct btrfs_delayed_ref_root *delayed_refs; | |
2590 | struct btrfs_delayed_ref_node *ref; | |
2591 | struct list_head cluster; | |
2592 | int ret; | |
a168650c | 2593 | u64 delayed_start; |
c3e69d58 CM |
2594 | int run_all = count == (unsigned long)-1; |
2595 | int run_most = 0; | |
1fa11e26 | 2596 | int loops; |
c3e69d58 | 2597 | |
79787eaa JM |
2598 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2599 | if (trans->aborted) | |
2600 | return 0; | |
2601 | ||
c3e69d58 CM |
2602 | if (root == root->fs_info->extent_root) |
2603 | root = root->fs_info->tree_root; | |
2604 | ||
edf39272 JS |
2605 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
2606 | ||
c3e69d58 CM |
2607 | delayed_refs = &trans->transaction->delayed_refs; |
2608 | INIT_LIST_HEAD(&cluster); | |
bb721703 CM |
2609 | if (count == 0) { |
2610 | count = delayed_refs->num_entries * 2; | |
2611 | run_most = 1; | |
2612 | } | |
2613 | ||
2614 | if (!run_all && !run_most) { | |
2615 | int old; | |
2616 | int seq = atomic_read(&delayed_refs->ref_seq); | |
2617 | ||
2618 | progress: | |
2619 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2620 | if (old) { | |
2621 | DEFINE_WAIT(__wait); | |
1be41b78 JB |
2622 | if (delayed_refs->flushing || |
2623 | !btrfs_should_throttle_delayed_refs(trans, root)) | |
bb721703 CM |
2624 | return 0; |
2625 | ||
2626 | prepare_to_wait(&delayed_refs->wait, &__wait, | |
2627 | TASK_UNINTERRUPTIBLE); | |
2628 | ||
2629 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2630 | if (old) { | |
2631 | schedule(); | |
2632 | finish_wait(&delayed_refs->wait, &__wait); | |
2633 | ||
2634 | if (!refs_newer(delayed_refs, seq, 256)) | |
2635 | goto progress; | |
2636 | else | |
2637 | return 0; | |
2638 | } else { | |
2639 | finish_wait(&delayed_refs->wait, &__wait); | |
2640 | goto again; | |
2641 | } | |
2642 | } | |
2643 | ||
2644 | } else { | |
2645 | atomic_inc(&delayed_refs->procs_running_refs); | |
2646 | } | |
2647 | ||
c3e69d58 | 2648 | again: |
1fa11e26 | 2649 | loops = 0; |
c3e69d58 | 2650 | spin_lock(&delayed_refs->lock); |
097b8a7c | 2651 | |
709c0486 AJ |
2652 | #ifdef SCRAMBLE_DELAYED_REFS |
2653 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2654 | #endif | |
2655 | ||
c3e69d58 CM |
2656 | while (1) { |
2657 | if (!(run_all || run_most) && | |
1be41b78 | 2658 | !btrfs_should_throttle_delayed_refs(trans, root)) |
c3e69d58 | 2659 | break; |
eb099670 | 2660 | |
56bec294 | 2661 | /* |
c3e69d58 CM |
2662 | * go find something we can process in the rbtree. We start at |
2663 | * the beginning of the tree, and then build a cluster | |
2664 | * of refs to process starting at the first one we are able to | |
2665 | * lock | |
56bec294 | 2666 | */ |
a168650c | 2667 | delayed_start = delayed_refs->run_delayed_start; |
c3e69d58 CM |
2668 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2669 | delayed_refs->run_delayed_start); | |
2670 | if (ret) | |
56bec294 CM |
2671 | break; |
2672 | ||
c3e69d58 | 2673 | ret = run_clustered_refs(trans, root, &cluster); |
79787eaa | 2674 | if (ret < 0) { |
093486c4 | 2675 | btrfs_release_ref_cluster(&cluster); |
79787eaa JM |
2676 | spin_unlock(&delayed_refs->lock); |
2677 | btrfs_abort_transaction(trans, root, ret); | |
bb721703 | 2678 | atomic_dec(&delayed_refs->procs_running_refs); |
f971fe29 | 2679 | wake_up(&delayed_refs->wait); |
79787eaa JM |
2680 | return ret; |
2681 | } | |
c3e69d58 | 2682 | |
bb721703 CM |
2683 | atomic_add(ret, &delayed_refs->ref_seq); |
2684 | ||
c3e69d58 CM |
2685 | count -= min_t(unsigned long, ret, count); |
2686 | ||
2687 | if (count == 0) | |
2688 | break; | |
a168650c | 2689 | |
1fa11e26 AJ |
2690 | if (delayed_start >= delayed_refs->run_delayed_start) { |
2691 | if (loops == 0) { | |
2692 | /* | |
2693 | * btrfs_find_ref_cluster looped. let's do one | |
2694 | * more cycle. if we don't run any delayed ref | |
2695 | * during that cycle (because we can't because | |
2696 | * all of them are blocked), bail out. | |
2697 | */ | |
2698 | loops = 1; | |
2699 | } else { | |
2700 | /* | |
2701 | * no runnable refs left, stop trying | |
2702 | */ | |
2703 | BUG_ON(run_all); | |
2704 | break; | |
2705 | } | |
2706 | } | |
2707 | if (ret) { | |
a168650c | 2708 | /* refs were run, let's reset staleness detection */ |
1fa11e26 | 2709 | loops = 0; |
a168650c | 2710 | } |
eb099670 | 2711 | } |
c3e69d58 | 2712 | |
56bec294 | 2713 | if (run_all) { |
ea658bad JB |
2714 | if (!list_empty(&trans->new_bgs)) { |
2715 | spin_unlock(&delayed_refs->lock); | |
2716 | btrfs_create_pending_block_groups(trans, root); | |
2717 | spin_lock(&delayed_refs->lock); | |
2718 | } | |
2719 | ||
56bec294 | 2720 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2721 | if (!node) |
56bec294 | 2722 | goto out; |
c3e69d58 | 2723 | count = (unsigned long)-1; |
e9d0b13b | 2724 | |
56bec294 CM |
2725 | while (node) { |
2726 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2727 | rb_node); | |
2728 | if (btrfs_delayed_ref_is_head(ref)) { | |
2729 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2730 | |
56bec294 CM |
2731 | head = btrfs_delayed_node_to_head(ref); |
2732 | atomic_inc(&ref->refs); | |
2733 | ||
2734 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2735 | /* |
2736 | * Mutex was contended, block until it's | |
2737 | * released and try again | |
2738 | */ | |
56bec294 CM |
2739 | mutex_lock(&head->mutex); |
2740 | mutex_unlock(&head->mutex); | |
2741 | ||
2742 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2743 | cond_resched(); |
56bec294 CM |
2744 | goto again; |
2745 | } | |
2746 | node = rb_next(node); | |
2747 | } | |
2748 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2749 | schedule_timeout(1); |
2750 | goto again; | |
5f39d397 | 2751 | } |
54aa1f4d | 2752 | out: |
bb721703 CM |
2753 | atomic_dec(&delayed_refs->procs_running_refs); |
2754 | smp_mb(); | |
2755 | if (waitqueue_active(&delayed_refs->wait)) | |
2756 | wake_up(&delayed_refs->wait); | |
2757 | ||
c3e69d58 | 2758 | spin_unlock(&delayed_refs->lock); |
edf39272 | 2759 | assert_qgroups_uptodate(trans); |
a28ec197 CM |
2760 | return 0; |
2761 | } | |
2762 | ||
5d4f98a2 YZ |
2763 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2764 | struct btrfs_root *root, | |
2765 | u64 bytenr, u64 num_bytes, u64 flags, | |
b1c79e09 | 2766 | int level, int is_data) |
5d4f98a2 YZ |
2767 | { |
2768 | struct btrfs_delayed_extent_op *extent_op; | |
2769 | int ret; | |
2770 | ||
78a6184a | 2771 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2772 | if (!extent_op) |
2773 | return -ENOMEM; | |
2774 | ||
2775 | extent_op->flags_to_set = flags; | |
2776 | extent_op->update_flags = 1; | |
2777 | extent_op->update_key = 0; | |
2778 | extent_op->is_data = is_data ? 1 : 0; | |
b1c79e09 | 2779 | extent_op->level = level; |
5d4f98a2 | 2780 | |
66d7e7f0 AJ |
2781 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2782 | num_bytes, extent_op); | |
5d4f98a2 | 2783 | if (ret) |
78a6184a | 2784 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2785 | return ret; |
2786 | } | |
2787 | ||
2788 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2789 | struct btrfs_root *root, | |
2790 | struct btrfs_path *path, | |
2791 | u64 objectid, u64 offset, u64 bytenr) | |
2792 | { | |
2793 | struct btrfs_delayed_ref_head *head; | |
2794 | struct btrfs_delayed_ref_node *ref; | |
2795 | struct btrfs_delayed_data_ref *data_ref; | |
2796 | struct btrfs_delayed_ref_root *delayed_refs; | |
2797 | struct rb_node *node; | |
2798 | int ret = 0; | |
2799 | ||
2800 | ret = -ENOENT; | |
2801 | delayed_refs = &trans->transaction->delayed_refs; | |
2802 | spin_lock(&delayed_refs->lock); | |
2803 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2804 | if (!head) | |
2805 | goto out; | |
2806 | ||
2807 | if (!mutex_trylock(&head->mutex)) { | |
2808 | atomic_inc(&head->node.refs); | |
2809 | spin_unlock(&delayed_refs->lock); | |
2810 | ||
b3b4aa74 | 2811 | btrfs_release_path(path); |
5d4f98a2 | 2812 | |
8cc33e5c DS |
2813 | /* |
2814 | * Mutex was contended, block until it's released and let | |
2815 | * caller try again | |
2816 | */ | |
5d4f98a2 YZ |
2817 | mutex_lock(&head->mutex); |
2818 | mutex_unlock(&head->mutex); | |
2819 | btrfs_put_delayed_ref(&head->node); | |
2820 | return -EAGAIN; | |
2821 | } | |
2822 | ||
2823 | node = rb_prev(&head->node.rb_node); | |
2824 | if (!node) | |
2825 | goto out_unlock; | |
2826 | ||
2827 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2828 | ||
2829 | if (ref->bytenr != bytenr) | |
2830 | goto out_unlock; | |
2831 | ||
2832 | ret = 1; | |
2833 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2834 | goto out_unlock; | |
2835 | ||
2836 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2837 | ||
2838 | node = rb_prev(node); | |
2839 | if (node) { | |
df57dbe6 LB |
2840 | int seq = ref->seq; |
2841 | ||
5d4f98a2 | 2842 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
df57dbe6 | 2843 | if (ref->bytenr == bytenr && ref->seq == seq) |
5d4f98a2 YZ |
2844 | goto out_unlock; |
2845 | } | |
2846 | ||
2847 | if (data_ref->root != root->root_key.objectid || | |
2848 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2849 | goto out_unlock; | |
2850 | ||
2851 | ret = 0; | |
2852 | out_unlock: | |
2853 | mutex_unlock(&head->mutex); | |
2854 | out: | |
2855 | spin_unlock(&delayed_refs->lock); | |
2856 | return ret; | |
2857 | } | |
2858 | ||
2859 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2860 | struct btrfs_root *root, | |
2861 | struct btrfs_path *path, | |
2862 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2863 | { |
2864 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2865 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2866 | struct btrfs_extent_data_ref *ref; |
2867 | struct btrfs_extent_inline_ref *iref; | |
2868 | struct btrfs_extent_item *ei; | |
f321e491 | 2869 | struct btrfs_key key; |
5d4f98a2 | 2870 | u32 item_size; |
be20aa9d | 2871 | int ret; |
925baedd | 2872 | |
be20aa9d | 2873 | key.objectid = bytenr; |
31840ae1 | 2874 | key.offset = (u64)-1; |
f321e491 | 2875 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2876 | |
be20aa9d CM |
2877 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2878 | if (ret < 0) | |
2879 | goto out; | |
79787eaa | 2880 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
2881 | |
2882 | ret = -ENOENT; | |
2883 | if (path->slots[0] == 0) | |
31840ae1 | 2884 | goto out; |
be20aa9d | 2885 | |
31840ae1 | 2886 | path->slots[0]--; |
f321e491 | 2887 | leaf = path->nodes[0]; |
5d4f98a2 | 2888 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2889 | |
5d4f98a2 | 2890 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2891 | goto out; |
f321e491 | 2892 | |
5d4f98a2 YZ |
2893 | ret = 1; |
2894 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2895 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2896 | if (item_size < sizeof(*ei)) { | |
2897 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2898 | goto out; | |
2899 | } | |
2900 | #endif | |
2901 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2902 | |
5d4f98a2 YZ |
2903 | if (item_size != sizeof(*ei) + |
2904 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2905 | goto out; | |
be20aa9d | 2906 | |
5d4f98a2 YZ |
2907 | if (btrfs_extent_generation(leaf, ei) <= |
2908 | btrfs_root_last_snapshot(&root->root_item)) | |
2909 | goto out; | |
2910 | ||
2911 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2912 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2913 | BTRFS_EXTENT_DATA_REF_KEY) | |
2914 | goto out; | |
2915 | ||
2916 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2917 | if (btrfs_extent_refs(leaf, ei) != | |
2918 | btrfs_extent_data_ref_count(leaf, ref) || | |
2919 | btrfs_extent_data_ref_root(leaf, ref) != | |
2920 | root->root_key.objectid || | |
2921 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2922 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2923 | goto out; | |
2924 | ||
2925 | ret = 0; | |
2926 | out: | |
2927 | return ret; | |
2928 | } | |
2929 | ||
2930 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2931 | struct btrfs_root *root, | |
2932 | u64 objectid, u64 offset, u64 bytenr) | |
2933 | { | |
2934 | struct btrfs_path *path; | |
2935 | int ret; | |
2936 | int ret2; | |
2937 | ||
2938 | path = btrfs_alloc_path(); | |
2939 | if (!path) | |
2940 | return -ENOENT; | |
2941 | ||
2942 | do { | |
2943 | ret = check_committed_ref(trans, root, path, objectid, | |
2944 | offset, bytenr); | |
2945 | if (ret && ret != -ENOENT) | |
f321e491 | 2946 | goto out; |
80ff3856 | 2947 | |
5d4f98a2 YZ |
2948 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2949 | offset, bytenr); | |
2950 | } while (ret2 == -EAGAIN); | |
2951 | ||
2952 | if (ret2 && ret2 != -ENOENT) { | |
2953 | ret = ret2; | |
2954 | goto out; | |
f321e491 | 2955 | } |
5d4f98a2 YZ |
2956 | |
2957 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2958 | ret = 0; | |
be20aa9d | 2959 | out: |
80ff3856 | 2960 | btrfs_free_path(path); |
f0486c68 YZ |
2961 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2962 | WARN_ON(ret > 0); | |
f321e491 | 2963 | return ret; |
be20aa9d | 2964 | } |
c5739bba | 2965 | |
5d4f98a2 | 2966 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2967 | struct btrfs_root *root, |
5d4f98a2 | 2968 | struct extent_buffer *buf, |
66d7e7f0 | 2969 | int full_backref, int inc, int for_cow) |
31840ae1 ZY |
2970 | { |
2971 | u64 bytenr; | |
5d4f98a2 YZ |
2972 | u64 num_bytes; |
2973 | u64 parent; | |
31840ae1 | 2974 | u64 ref_root; |
31840ae1 | 2975 | u32 nritems; |
31840ae1 ZY |
2976 | struct btrfs_key key; |
2977 | struct btrfs_file_extent_item *fi; | |
2978 | int i; | |
2979 | int level; | |
2980 | int ret = 0; | |
31840ae1 | 2981 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 2982 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 ZY |
2983 | |
2984 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2985 | nritems = btrfs_header_nritems(buf); |
2986 | level = btrfs_header_level(buf); | |
2987 | ||
5d4f98a2 YZ |
2988 | if (!root->ref_cows && level == 0) |
2989 | return 0; | |
31840ae1 | 2990 | |
5d4f98a2 YZ |
2991 | if (inc) |
2992 | process_func = btrfs_inc_extent_ref; | |
2993 | else | |
2994 | process_func = btrfs_free_extent; | |
31840ae1 | 2995 | |
5d4f98a2 YZ |
2996 | if (full_backref) |
2997 | parent = buf->start; | |
2998 | else | |
2999 | parent = 0; | |
3000 | ||
3001 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 3002 | if (level == 0) { |
5d4f98a2 | 3003 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
3004 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
3005 | continue; | |
5d4f98a2 | 3006 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3007 | struct btrfs_file_extent_item); |
3008 | if (btrfs_file_extent_type(buf, fi) == | |
3009 | BTRFS_FILE_EXTENT_INLINE) | |
3010 | continue; | |
3011 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3012 | if (bytenr == 0) | |
3013 | continue; | |
5d4f98a2 YZ |
3014 | |
3015 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3016 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
3017 | ret = process_func(trans, root, bytenr, num_bytes, | |
3018 | parent, ref_root, key.objectid, | |
66d7e7f0 | 3019 | key.offset, for_cow); |
31840ae1 ZY |
3020 | if (ret) |
3021 | goto fail; | |
3022 | } else { | |
5d4f98a2 YZ |
3023 | bytenr = btrfs_node_blockptr(buf, i); |
3024 | num_bytes = btrfs_level_size(root, level - 1); | |
3025 | ret = process_func(trans, root, bytenr, num_bytes, | |
66d7e7f0 AJ |
3026 | parent, ref_root, level - 1, 0, |
3027 | for_cow); | |
31840ae1 ZY |
3028 | if (ret) |
3029 | goto fail; | |
3030 | } | |
3031 | } | |
3032 | return 0; | |
3033 | fail: | |
5d4f98a2 YZ |
3034 | return ret; |
3035 | } | |
3036 | ||
3037 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3038 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3039 | { |
66d7e7f0 | 3040 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
5d4f98a2 YZ |
3041 | } |
3042 | ||
3043 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3044 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3045 | { |
66d7e7f0 | 3046 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
31840ae1 ZY |
3047 | } |
3048 | ||
9078a3e1 CM |
3049 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
3050 | struct btrfs_root *root, | |
3051 | struct btrfs_path *path, | |
3052 | struct btrfs_block_group_cache *cache) | |
3053 | { | |
3054 | int ret; | |
9078a3e1 | 3055 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
3056 | unsigned long bi; |
3057 | struct extent_buffer *leaf; | |
9078a3e1 | 3058 | |
9078a3e1 | 3059 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
3060 | if (ret < 0) |
3061 | goto fail; | |
79787eaa | 3062 | BUG_ON(ret); /* Corruption */ |
5f39d397 CM |
3063 | |
3064 | leaf = path->nodes[0]; | |
3065 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3066 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3067 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 3068 | btrfs_release_path(path); |
54aa1f4d | 3069 | fail: |
79787eaa JM |
3070 | if (ret) { |
3071 | btrfs_abort_transaction(trans, root, ret); | |
9078a3e1 | 3072 | return ret; |
79787eaa | 3073 | } |
9078a3e1 CM |
3074 | return 0; |
3075 | ||
3076 | } | |
3077 | ||
4a8c9a62 YZ |
3078 | static struct btrfs_block_group_cache * |
3079 | next_block_group(struct btrfs_root *root, | |
3080 | struct btrfs_block_group_cache *cache) | |
3081 | { | |
3082 | struct rb_node *node; | |
3083 | spin_lock(&root->fs_info->block_group_cache_lock); | |
3084 | node = rb_next(&cache->cache_node); | |
3085 | btrfs_put_block_group(cache); | |
3086 | if (node) { | |
3087 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3088 | cache_node); | |
11dfe35a | 3089 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3090 | } else |
3091 | cache = NULL; | |
3092 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3093 | return cache; | |
3094 | } | |
3095 | ||
0af3d00b JB |
3096 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3097 | struct btrfs_trans_handle *trans, | |
3098 | struct btrfs_path *path) | |
3099 | { | |
3100 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
3101 | struct inode *inode = NULL; | |
3102 | u64 alloc_hint = 0; | |
2b20982e | 3103 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
3104 | int num_pages = 0; |
3105 | int retries = 0; | |
3106 | int ret = 0; | |
3107 | ||
3108 | /* | |
3109 | * If this block group is smaller than 100 megs don't bother caching the | |
3110 | * block group. | |
3111 | */ | |
3112 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
3113 | spin_lock(&block_group->lock); | |
3114 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3115 | spin_unlock(&block_group->lock); | |
3116 | return 0; | |
3117 | } | |
3118 | ||
3119 | again: | |
3120 | inode = lookup_free_space_inode(root, block_group, path); | |
3121 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3122 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3123 | btrfs_release_path(path); |
0af3d00b JB |
3124 | goto out; |
3125 | } | |
3126 | ||
3127 | if (IS_ERR(inode)) { | |
3128 | BUG_ON(retries); | |
3129 | retries++; | |
3130 | ||
3131 | if (block_group->ro) | |
3132 | goto out_free; | |
3133 | ||
3134 | ret = create_free_space_inode(root, trans, block_group, path); | |
3135 | if (ret) | |
3136 | goto out_free; | |
3137 | goto again; | |
3138 | } | |
3139 | ||
5b0e95bf JB |
3140 | /* We've already setup this transaction, go ahead and exit */ |
3141 | if (block_group->cache_generation == trans->transid && | |
3142 | i_size_read(inode)) { | |
3143 | dcs = BTRFS_DC_SETUP; | |
3144 | goto out_put; | |
3145 | } | |
3146 | ||
0af3d00b JB |
3147 | /* |
3148 | * We want to set the generation to 0, that way if anything goes wrong | |
3149 | * from here on out we know not to trust this cache when we load up next | |
3150 | * time. | |
3151 | */ | |
3152 | BTRFS_I(inode)->generation = 0; | |
3153 | ret = btrfs_update_inode(trans, root, inode); | |
3154 | WARN_ON(ret); | |
3155 | ||
3156 | if (i_size_read(inode) > 0) { | |
7b61cd92 MX |
3157 | ret = btrfs_check_trunc_cache_free_space(root, |
3158 | &root->fs_info->global_block_rsv); | |
3159 | if (ret) | |
3160 | goto out_put; | |
3161 | ||
0af3d00b JB |
3162 | ret = btrfs_truncate_free_space_cache(root, trans, path, |
3163 | inode); | |
3164 | if (ret) | |
3165 | goto out_put; | |
3166 | } | |
3167 | ||
3168 | spin_lock(&block_group->lock); | |
cf7c1ef6 LB |
3169 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
3170 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
3171 | /* | |
3172 | * don't bother trying to write stuff out _if_ | |
3173 | * a) we're not cached, | |
3174 | * b) we're with nospace_cache mount option. | |
3175 | */ | |
2b20982e | 3176 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3177 | spin_unlock(&block_group->lock); |
3178 | goto out_put; | |
3179 | } | |
3180 | spin_unlock(&block_group->lock); | |
3181 | ||
6fc823b1 JB |
3182 | /* |
3183 | * Try to preallocate enough space based on how big the block group is. | |
3184 | * Keep in mind this has to include any pinned space which could end up | |
3185 | * taking up quite a bit since it's not folded into the other space | |
3186 | * cache. | |
3187 | */ | |
3188 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); | |
0af3d00b JB |
3189 | if (!num_pages) |
3190 | num_pages = 1; | |
3191 | ||
0af3d00b JB |
3192 | num_pages *= 16; |
3193 | num_pages *= PAGE_CACHE_SIZE; | |
3194 | ||
3195 | ret = btrfs_check_data_free_space(inode, num_pages); | |
3196 | if (ret) | |
3197 | goto out_put; | |
3198 | ||
3199 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3200 | num_pages, num_pages, | |
3201 | &alloc_hint); | |
2b20982e JB |
3202 | if (!ret) |
3203 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3204 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3205 | |
0af3d00b JB |
3206 | out_put: |
3207 | iput(inode); | |
3208 | out_free: | |
b3b4aa74 | 3209 | btrfs_release_path(path); |
0af3d00b JB |
3210 | out: |
3211 | spin_lock(&block_group->lock); | |
e65cbb94 | 3212 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3213 | block_group->cache_generation = trans->transid; |
2b20982e | 3214 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3215 | spin_unlock(&block_group->lock); |
3216 | ||
3217 | return ret; | |
3218 | } | |
3219 | ||
96b5179d CM |
3220 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
3221 | struct btrfs_root *root) | |
9078a3e1 | 3222 | { |
4a8c9a62 | 3223 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 3224 | int err = 0; |
9078a3e1 | 3225 | struct btrfs_path *path; |
96b5179d | 3226 | u64 last = 0; |
9078a3e1 CM |
3227 | |
3228 | path = btrfs_alloc_path(); | |
3229 | if (!path) | |
3230 | return -ENOMEM; | |
3231 | ||
0af3d00b JB |
3232 | again: |
3233 | while (1) { | |
3234 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3235 | while (cache) { | |
3236 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3237 | break; | |
3238 | cache = next_block_group(root, cache); | |
3239 | } | |
3240 | if (!cache) { | |
3241 | if (last == 0) | |
3242 | break; | |
3243 | last = 0; | |
3244 | continue; | |
3245 | } | |
3246 | err = cache_save_setup(cache, trans, path); | |
3247 | last = cache->key.objectid + cache->key.offset; | |
3248 | btrfs_put_block_group(cache); | |
3249 | } | |
3250 | ||
d397712b | 3251 | while (1) { |
4a8c9a62 YZ |
3252 | if (last == 0) { |
3253 | err = btrfs_run_delayed_refs(trans, root, | |
3254 | (unsigned long)-1); | |
79787eaa JM |
3255 | if (err) /* File system offline */ |
3256 | goto out; | |
0f9dd46c | 3257 | } |
54aa1f4d | 3258 | |
4a8c9a62 YZ |
3259 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
3260 | while (cache) { | |
0af3d00b JB |
3261 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
3262 | btrfs_put_block_group(cache); | |
3263 | goto again; | |
3264 | } | |
3265 | ||
4a8c9a62 YZ |
3266 | if (cache->dirty) |
3267 | break; | |
3268 | cache = next_block_group(root, cache); | |
3269 | } | |
3270 | if (!cache) { | |
3271 | if (last == 0) | |
3272 | break; | |
3273 | last = 0; | |
3274 | continue; | |
3275 | } | |
0f9dd46c | 3276 | |
0cb59c99 JB |
3277 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
3278 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 3279 | cache->dirty = 0; |
4a8c9a62 | 3280 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 3281 | |
4a8c9a62 | 3282 | err = write_one_cache_group(trans, root, path, cache); |
79787eaa JM |
3283 | if (err) /* File system offline */ |
3284 | goto out; | |
3285 | ||
4a8c9a62 | 3286 | btrfs_put_block_group(cache); |
9078a3e1 | 3287 | } |
4a8c9a62 | 3288 | |
0cb59c99 JB |
3289 | while (1) { |
3290 | /* | |
3291 | * I don't think this is needed since we're just marking our | |
3292 | * preallocated extent as written, but just in case it can't | |
3293 | * hurt. | |
3294 | */ | |
3295 | if (last == 0) { | |
3296 | err = btrfs_run_delayed_refs(trans, root, | |
3297 | (unsigned long)-1); | |
79787eaa JM |
3298 | if (err) /* File system offline */ |
3299 | goto out; | |
0cb59c99 JB |
3300 | } |
3301 | ||
3302 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3303 | while (cache) { | |
3304 | /* | |
3305 | * Really this shouldn't happen, but it could if we | |
3306 | * couldn't write the entire preallocated extent and | |
3307 | * splitting the extent resulted in a new block. | |
3308 | */ | |
3309 | if (cache->dirty) { | |
3310 | btrfs_put_block_group(cache); | |
3311 | goto again; | |
3312 | } | |
3313 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
3314 | break; | |
3315 | cache = next_block_group(root, cache); | |
3316 | } | |
3317 | if (!cache) { | |
3318 | if (last == 0) | |
3319 | break; | |
3320 | last = 0; | |
3321 | continue; | |
3322 | } | |
3323 | ||
79787eaa | 3324 | err = btrfs_write_out_cache(root, trans, cache, path); |
0cb59c99 JB |
3325 | |
3326 | /* | |
3327 | * If we didn't have an error then the cache state is still | |
3328 | * NEED_WRITE, so we can set it to WRITTEN. | |
3329 | */ | |
79787eaa | 3330 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
0cb59c99 JB |
3331 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
3332 | last = cache->key.objectid + cache->key.offset; | |
3333 | btrfs_put_block_group(cache); | |
3334 | } | |
79787eaa | 3335 | out: |
0cb59c99 | 3336 | |
9078a3e1 | 3337 | btrfs_free_path(path); |
79787eaa | 3338 | return err; |
9078a3e1 CM |
3339 | } |
3340 | ||
d2fb3437 YZ |
3341 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3342 | { | |
3343 | struct btrfs_block_group_cache *block_group; | |
3344 | int readonly = 0; | |
3345 | ||
3346 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3347 | if (!block_group || block_group->ro) | |
3348 | readonly = 1; | |
3349 | if (block_group) | |
fa9c0d79 | 3350 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3351 | return readonly; |
3352 | } | |
3353 | ||
593060d7 CM |
3354 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3355 | u64 total_bytes, u64 bytes_used, | |
3356 | struct btrfs_space_info **space_info) | |
3357 | { | |
3358 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3359 | int i; |
3360 | int factor; | |
b150a4f1 | 3361 | int ret; |
b742bb82 YZ |
3362 | |
3363 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3364 | BTRFS_BLOCK_GROUP_RAID10)) | |
3365 | factor = 2; | |
3366 | else | |
3367 | factor = 1; | |
593060d7 CM |
3368 | |
3369 | found = __find_space_info(info, flags); | |
3370 | if (found) { | |
25179201 | 3371 | spin_lock(&found->lock); |
593060d7 | 3372 | found->total_bytes += total_bytes; |
89a55897 | 3373 | found->disk_total += total_bytes * factor; |
593060d7 | 3374 | found->bytes_used += bytes_used; |
b742bb82 | 3375 | found->disk_used += bytes_used * factor; |
8f18cf13 | 3376 | found->full = 0; |
25179201 | 3377 | spin_unlock(&found->lock); |
593060d7 CM |
3378 | *space_info = found; |
3379 | return 0; | |
3380 | } | |
c146afad | 3381 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3382 | if (!found) |
3383 | return -ENOMEM; | |
3384 | ||
b150a4f1 JB |
3385 | ret = percpu_counter_init(&found->total_bytes_pinned, 0); |
3386 | if (ret) { | |
3387 | kfree(found); | |
3388 | return ret; | |
3389 | } | |
3390 | ||
b742bb82 YZ |
3391 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
3392 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 3393 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3394 | spin_lock_init(&found->lock); |
52ba6929 | 3395 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3396 | found->total_bytes = total_bytes; |
89a55897 | 3397 | found->disk_total = total_bytes * factor; |
593060d7 | 3398 | found->bytes_used = bytes_used; |
b742bb82 | 3399 | found->disk_used = bytes_used * factor; |
593060d7 | 3400 | found->bytes_pinned = 0; |
e8569813 | 3401 | found->bytes_reserved = 0; |
c146afad | 3402 | found->bytes_readonly = 0; |
f0486c68 | 3403 | found->bytes_may_use = 0; |
593060d7 | 3404 | found->full = 0; |
0e4f8f88 | 3405 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3406 | found->chunk_alloc = 0; |
fdb5effd JB |
3407 | found->flush = 0; |
3408 | init_waitqueue_head(&found->wait); | |
593060d7 | 3409 | *space_info = found; |
4184ea7f | 3410 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3411 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3412 | info->data_sinfo = found; | |
593060d7 CM |
3413 | return 0; |
3414 | } | |
3415 | ||
8790d502 CM |
3416 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3417 | { | |
899c81ea ID |
3418 | u64 extra_flags = chunk_to_extended(flags) & |
3419 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3420 | |
de98ced9 | 3421 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3422 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3423 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3424 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3425 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3426 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3427 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3428 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3429 | } |
593060d7 | 3430 | |
fc67c450 ID |
3431 | /* |
3432 | * returns target flags in extended format or 0 if restripe for this | |
3433 | * chunk_type is not in progress | |
c6664b42 ID |
3434 | * |
3435 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3436 | */ |
3437 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3438 | { | |
3439 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3440 | u64 target = 0; | |
3441 | ||
fc67c450 ID |
3442 | if (!bctl) |
3443 | return 0; | |
3444 | ||
3445 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3446 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3447 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3448 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3449 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3450 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3451 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3452 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3453 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3454 | } | |
3455 | ||
3456 | return target; | |
3457 | } | |
3458 | ||
a46d11a8 ID |
3459 | /* |
3460 | * @flags: available profiles in extended format (see ctree.h) | |
3461 | * | |
e4d8ec0f ID |
3462 | * Returns reduced profile in chunk format. If profile changing is in |
3463 | * progress (either running or paused) picks the target profile (if it's | |
3464 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3465 | */ |
48a3b636 | 3466 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3467 | { |
cd02dca5 CM |
3468 | /* |
3469 | * we add in the count of missing devices because we want | |
3470 | * to make sure that any RAID levels on a degraded FS | |
3471 | * continue to be honored. | |
3472 | */ | |
3473 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3474 | root->fs_info->fs_devices->missing_devices; | |
fc67c450 | 3475 | u64 target; |
53b381b3 | 3476 | u64 tmp; |
a061fc8d | 3477 | |
fc67c450 ID |
3478 | /* |
3479 | * see if restripe for this chunk_type is in progress, if so | |
3480 | * try to reduce to the target profile | |
3481 | */ | |
e4d8ec0f | 3482 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3483 | target = get_restripe_target(root->fs_info, flags); |
3484 | if (target) { | |
3485 | /* pick target profile only if it's already available */ | |
3486 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3487 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3488 | return extended_to_chunk(target); |
e4d8ec0f ID |
3489 | } |
3490 | } | |
3491 | spin_unlock(&root->fs_info->balance_lock); | |
3492 | ||
53b381b3 | 3493 | /* First, mask out the RAID levels which aren't possible */ |
a061fc8d | 3494 | if (num_devices == 1) |
53b381b3 DW |
3495 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
3496 | BTRFS_BLOCK_GROUP_RAID5); | |
3497 | if (num_devices < 3) | |
3498 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; | |
a061fc8d CM |
3499 | if (num_devices < 4) |
3500 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3501 | ||
53b381b3 DW |
3502 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
3503 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | | |
3504 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); | |
3505 | flags &= ~tmp; | |
ec44a35c | 3506 | |
53b381b3 DW |
3507 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
3508 | tmp = BTRFS_BLOCK_GROUP_RAID6; | |
3509 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) | |
3510 | tmp = BTRFS_BLOCK_GROUP_RAID5; | |
3511 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) | |
3512 | tmp = BTRFS_BLOCK_GROUP_RAID10; | |
3513 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) | |
3514 | tmp = BTRFS_BLOCK_GROUP_RAID1; | |
3515 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) | |
3516 | tmp = BTRFS_BLOCK_GROUP_RAID0; | |
a46d11a8 | 3517 | |
53b381b3 | 3518 | return extended_to_chunk(flags | tmp); |
ec44a35c CM |
3519 | } |
3520 | ||
b742bb82 | 3521 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3522 | { |
de98ced9 MX |
3523 | unsigned seq; |
3524 | ||
3525 | do { | |
3526 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
3527 | ||
3528 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3529 | flags |= root->fs_info->avail_data_alloc_bits; | |
3530 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3531 | flags |= root->fs_info->avail_system_alloc_bits; | |
3532 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3533 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3534 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3535 | |
b742bb82 | 3536 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3537 | } |
3538 | ||
6d07bcec | 3539 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3540 | { |
b742bb82 | 3541 | u64 flags; |
53b381b3 | 3542 | u64 ret; |
9ed74f2d | 3543 | |
b742bb82 YZ |
3544 | if (data) |
3545 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3546 | else if (root == root->fs_info->chunk_root) | |
3547 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3548 | else |
b742bb82 | 3549 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3550 | |
53b381b3 DW |
3551 | ret = get_alloc_profile(root, flags); |
3552 | return ret; | |
6a63209f | 3553 | } |
9ed74f2d | 3554 | |
6a63209f | 3555 | /* |
6a63209f JB |
3556 | * This will check the space that the inode allocates from to make sure we have |
3557 | * enough space for bytes. | |
6a63209f | 3558 | */ |
0ca1f7ce | 3559 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3560 | { |
6a63209f | 3561 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3562 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3563 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3564 | u64 used; |
0af3d00b | 3565 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3566 | |
6a63209f | 3567 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3568 | bytes = ALIGN(bytes, root->sectorsize); |
6a63209f | 3569 | |
82d5902d LZ |
3570 | if (root == root->fs_info->tree_root || |
3571 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3572 | alloc_chunk = 0; |
3573 | committed = 1; | |
3574 | } | |
3575 | ||
b4d7c3c9 | 3576 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3577 | if (!data_sinfo) |
3578 | goto alloc; | |
9ed74f2d | 3579 | |
6a63209f JB |
3580 | again: |
3581 | /* make sure we have enough space to handle the data first */ | |
3582 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3583 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3584 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3585 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3586 | |
3587 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3588 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3589 | |
6a63209f JB |
3590 | /* |
3591 | * if we don't have enough free bytes in this space then we need | |
3592 | * to alloc a new chunk. | |
3593 | */ | |
0af3d00b | 3594 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3595 | u64 alloc_target; |
9ed74f2d | 3596 | |
0e4f8f88 | 3597 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3598 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3599 | alloc: |
6a63209f | 3600 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3601 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3602 | if (IS_ERR(trans)) |
3603 | return PTR_ERR(trans); | |
9ed74f2d | 3604 | |
6a63209f | 3605 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3606 | alloc_target, |
3607 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3608 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3609 | if (ret < 0) { |
3610 | if (ret != -ENOSPC) | |
3611 | return ret; | |
3612 | else | |
3613 | goto commit_trans; | |
3614 | } | |
9ed74f2d | 3615 | |
b4d7c3c9 LZ |
3616 | if (!data_sinfo) |
3617 | data_sinfo = fs_info->data_sinfo; | |
3618 | ||
6a63209f JB |
3619 | goto again; |
3620 | } | |
f2bb8f5c JB |
3621 | |
3622 | /* | |
b150a4f1 JB |
3623 | * If we don't have enough pinned space to deal with this |
3624 | * allocation don't bother committing the transaction. | |
f2bb8f5c | 3625 | */ |
b150a4f1 JB |
3626 | if (percpu_counter_compare(&data_sinfo->total_bytes_pinned, |
3627 | bytes) < 0) | |
f2bb8f5c | 3628 | committed = 1; |
6a63209f | 3629 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3630 | |
4e06bdd6 | 3631 | /* commit the current transaction and try again */ |
d52a5b5f | 3632 | commit_trans: |
a4abeea4 JB |
3633 | if (!committed && |
3634 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3635 | committed = 1; |
b150a4f1 | 3636 | |
7a7eaa40 | 3637 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3638 | if (IS_ERR(trans)) |
3639 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3640 | ret = btrfs_commit_transaction(trans, root); |
3641 | if (ret) | |
3642 | return ret; | |
3643 | goto again; | |
3644 | } | |
9ed74f2d | 3645 | |
6a63209f JB |
3646 | return -ENOSPC; |
3647 | } | |
3648 | data_sinfo->bytes_may_use += bytes; | |
8c2a3ca2 | 3649 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3650 | data_sinfo->flags, bytes, 1); |
6a63209f | 3651 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3652 | |
9ed74f2d | 3653 | return 0; |
9ed74f2d | 3654 | } |
6a63209f | 3655 | |
6a63209f | 3656 | /* |
fb25e914 | 3657 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3658 | */ |
0ca1f7ce | 3659 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3660 | { |
0ca1f7ce | 3661 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3662 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3663 | |
6a63209f | 3664 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3665 | bytes = ALIGN(bytes, root->sectorsize); |
e3ccfa98 | 3666 | |
b4d7c3c9 | 3667 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f | 3668 | spin_lock(&data_sinfo->lock); |
7ee9e440 | 3669 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
6a63209f | 3670 | data_sinfo->bytes_may_use -= bytes; |
8c2a3ca2 | 3671 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3672 | data_sinfo->flags, bytes, 0); |
6a63209f | 3673 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3674 | } |
3675 | ||
97e728d4 | 3676 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3677 | { |
97e728d4 JB |
3678 | struct list_head *head = &info->space_info; |
3679 | struct btrfs_space_info *found; | |
e3ccfa98 | 3680 | |
97e728d4 JB |
3681 | rcu_read_lock(); |
3682 | list_for_each_entry_rcu(found, head, list) { | |
3683 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3684 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3685 | } |
97e728d4 | 3686 | rcu_read_unlock(); |
e3ccfa98 JB |
3687 | } |
3688 | ||
3c76cd84 MX |
3689 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
3690 | { | |
3691 | return (global->size << 1); | |
3692 | } | |
3693 | ||
e5bc2458 | 3694 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 3695 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 3696 | { |
fb25e914 | 3697 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3698 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3699 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3700 | u64 thresh; |
e3ccfa98 | 3701 | |
0e4f8f88 CM |
3702 | if (force == CHUNK_ALLOC_FORCE) |
3703 | return 1; | |
3704 | ||
fb25e914 JB |
3705 | /* |
3706 | * We need to take into account the global rsv because for all intents | |
3707 | * and purposes it's used space. Don't worry about locking the | |
3708 | * global_rsv, it doesn't change except when the transaction commits. | |
3709 | */ | |
54338b5c | 3710 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3c76cd84 | 3711 | num_allocated += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 3712 | |
0e4f8f88 CM |
3713 | /* |
3714 | * in limited mode, we want to have some free space up to | |
3715 | * about 1% of the FS size. | |
3716 | */ | |
3717 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3718 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3719 | thresh = max_t(u64, 64 * 1024 * 1024, |
3720 | div_factor_fine(thresh, 1)); | |
3721 | ||
3722 | if (num_bytes - num_allocated < thresh) | |
3723 | return 1; | |
3724 | } | |
0e4f8f88 | 3725 | |
698d0082 | 3726 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 3727 | return 0; |
424499db | 3728 | return 1; |
32c00aff JB |
3729 | } |
3730 | ||
15d1ff81 LB |
3731 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
3732 | { | |
3733 | u64 num_dev; | |
3734 | ||
53b381b3 DW |
3735 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
3736 | BTRFS_BLOCK_GROUP_RAID0 | | |
3737 | BTRFS_BLOCK_GROUP_RAID5 | | |
3738 | BTRFS_BLOCK_GROUP_RAID6)) | |
15d1ff81 LB |
3739 | num_dev = root->fs_info->fs_devices->rw_devices; |
3740 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
3741 | num_dev = 2; | |
3742 | else | |
3743 | num_dev = 1; /* DUP or single */ | |
3744 | ||
3745 | /* metadata for updaing devices and chunk tree */ | |
3746 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); | |
3747 | } | |
3748 | ||
3749 | static void check_system_chunk(struct btrfs_trans_handle *trans, | |
3750 | struct btrfs_root *root, u64 type) | |
3751 | { | |
3752 | struct btrfs_space_info *info; | |
3753 | u64 left; | |
3754 | u64 thresh; | |
3755 | ||
3756 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3757 | spin_lock(&info->lock); | |
3758 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
3759 | info->bytes_reserved - info->bytes_readonly; | |
3760 | spin_unlock(&info->lock); | |
3761 | ||
3762 | thresh = get_system_chunk_thresh(root, type); | |
3763 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
c2cf52eb SK |
3764 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
3765 | left, thresh, type); | |
15d1ff81 LB |
3766 | dump_space_info(info, 0, 0); |
3767 | } | |
3768 | ||
3769 | if (left < thresh) { | |
3770 | u64 flags; | |
3771 | ||
3772 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
3773 | btrfs_alloc_chunk(trans, root, flags); | |
3774 | } | |
3775 | } | |
3776 | ||
6324fbf3 | 3777 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 3778 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 3779 | { |
6324fbf3 | 3780 | struct btrfs_space_info *space_info; |
97e728d4 | 3781 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3782 | int wait_for_alloc = 0; |
9ed74f2d | 3783 | int ret = 0; |
9ed74f2d | 3784 | |
c6b305a8 JB |
3785 | /* Don't re-enter if we're already allocating a chunk */ |
3786 | if (trans->allocating_chunk) | |
3787 | return -ENOSPC; | |
3788 | ||
6324fbf3 | 3789 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3790 | if (!space_info) { |
3791 | ret = update_space_info(extent_root->fs_info, flags, | |
3792 | 0, 0, &space_info); | |
79787eaa | 3793 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 3794 | } |
79787eaa | 3795 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 3796 | |
6d74119f | 3797 | again: |
25179201 | 3798 | spin_lock(&space_info->lock); |
9e622d6b | 3799 | if (force < space_info->force_alloc) |
0e4f8f88 | 3800 | force = space_info->force_alloc; |
25179201 JB |
3801 | if (space_info->full) { |
3802 | spin_unlock(&space_info->lock); | |
6d74119f | 3803 | return 0; |
9ed74f2d JB |
3804 | } |
3805 | ||
698d0082 | 3806 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 3807 | spin_unlock(&space_info->lock); |
6d74119f JB |
3808 | return 0; |
3809 | } else if (space_info->chunk_alloc) { | |
3810 | wait_for_alloc = 1; | |
3811 | } else { | |
3812 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3813 | } |
0e4f8f88 | 3814 | |
25179201 | 3815 | spin_unlock(&space_info->lock); |
9ed74f2d | 3816 | |
6d74119f JB |
3817 | mutex_lock(&fs_info->chunk_mutex); |
3818 | ||
3819 | /* | |
3820 | * The chunk_mutex is held throughout the entirety of a chunk | |
3821 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3822 | * other guy is done and we need to recheck and see if we should | |
3823 | * allocate. | |
3824 | */ | |
3825 | if (wait_for_alloc) { | |
3826 | mutex_unlock(&fs_info->chunk_mutex); | |
3827 | wait_for_alloc = 0; | |
3828 | goto again; | |
3829 | } | |
3830 | ||
c6b305a8 JB |
3831 | trans->allocating_chunk = true; |
3832 | ||
67377734 JB |
3833 | /* |
3834 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3835 | * allocating mixed chunks instead of individual chunks. | |
3836 | */ | |
3837 | if (btrfs_mixed_space_info(space_info)) | |
3838 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3839 | ||
97e728d4 JB |
3840 | /* |
3841 | * if we're doing a data chunk, go ahead and make sure that | |
3842 | * we keep a reasonable number of metadata chunks allocated in the | |
3843 | * FS as well. | |
3844 | */ | |
9ed74f2d | 3845 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3846 | fs_info->data_chunk_allocations++; |
3847 | if (!(fs_info->data_chunk_allocations % | |
3848 | fs_info->metadata_ratio)) | |
3849 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3850 | } |
3851 | ||
15d1ff81 LB |
3852 | /* |
3853 | * Check if we have enough space in SYSTEM chunk because we may need | |
3854 | * to update devices. | |
3855 | */ | |
3856 | check_system_chunk(trans, extent_root, flags); | |
3857 | ||
2b82032c | 3858 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 3859 | trans->allocating_chunk = false; |
92b8e897 | 3860 | |
9ed74f2d | 3861 | spin_lock(&space_info->lock); |
a81cb9a2 AO |
3862 | if (ret < 0 && ret != -ENOSPC) |
3863 | goto out; | |
9ed74f2d | 3864 | if (ret) |
6324fbf3 | 3865 | space_info->full = 1; |
424499db YZ |
3866 | else |
3867 | ret = 1; | |
6d74119f | 3868 | |
0e4f8f88 | 3869 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 3870 | out: |
6d74119f | 3871 | space_info->chunk_alloc = 0; |
9ed74f2d | 3872 | spin_unlock(&space_info->lock); |
a25c75d5 | 3873 | mutex_unlock(&fs_info->chunk_mutex); |
0f9dd46c | 3874 | return ret; |
6324fbf3 | 3875 | } |
9ed74f2d | 3876 | |
a80c8dcf JB |
3877 | static int can_overcommit(struct btrfs_root *root, |
3878 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 3879 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 3880 | { |
96f1bb57 | 3881 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 3882 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3c76cd84 | 3883 | u64 space_size; |
a80c8dcf JB |
3884 | u64 avail; |
3885 | u64 used; | |
70afa399 | 3886 | u64 to_add; |
a80c8dcf JB |
3887 | |
3888 | used = space_info->bytes_used + space_info->bytes_reserved + | |
96f1bb57 JB |
3889 | space_info->bytes_pinned + space_info->bytes_readonly; |
3890 | ||
96f1bb57 JB |
3891 | /* |
3892 | * We only want to allow over committing if we have lots of actual space | |
3893 | * free, but if we don't have enough space to handle the global reserve | |
3894 | * space then we could end up having a real enospc problem when trying | |
3895 | * to allocate a chunk or some other such important allocation. | |
3896 | */ | |
3c76cd84 MX |
3897 | spin_lock(&global_rsv->lock); |
3898 | space_size = calc_global_rsv_need_space(global_rsv); | |
3899 | spin_unlock(&global_rsv->lock); | |
3900 | if (used + space_size >= space_info->total_bytes) | |
96f1bb57 JB |
3901 | return 0; |
3902 | ||
3903 | used += space_info->bytes_may_use; | |
a80c8dcf JB |
3904 | |
3905 | spin_lock(&root->fs_info->free_chunk_lock); | |
3906 | avail = root->fs_info->free_chunk_space; | |
3907 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3908 | ||
3909 | /* | |
3910 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
3911 | * space is actually useable. For raid56, the space info used |
3912 | * doesn't include the parity drive, so we don't have to | |
3913 | * change the math | |
a80c8dcf JB |
3914 | */ |
3915 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3916 | BTRFS_BLOCK_GROUP_RAID1 | | |
3917 | BTRFS_BLOCK_GROUP_RAID10)) | |
3918 | avail >>= 1; | |
3919 | ||
70afa399 JB |
3920 | to_add = space_info->total_bytes; |
3921 | ||
a80c8dcf | 3922 | /* |
561c294d MX |
3923 | * If we aren't flushing all things, let us overcommit up to |
3924 | * 1/2th of the space. If we can flush, don't let us overcommit | |
3925 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 3926 | */ |
08e007d2 | 3927 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
70afa399 | 3928 | to_add >>= 3; |
a80c8dcf | 3929 | else |
70afa399 | 3930 | to_add >>= 1; |
a80c8dcf | 3931 | |
70afa399 JB |
3932 | /* |
3933 | * Limit the overcommit to the amount of free space we could possibly | |
3934 | * allocate for chunks. | |
3935 | */ | |
3936 | to_add = min(avail, to_add); | |
a80c8dcf | 3937 | |
70afa399 | 3938 | if (used + bytes < space_info->total_bytes + to_add) |
a80c8dcf JB |
3939 | return 1; |
3940 | return 0; | |
3941 | } | |
3942 | ||
48a3b636 ES |
3943 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
3944 | unsigned long nr_pages) | |
da633a42 MX |
3945 | { |
3946 | struct super_block *sb = root->fs_info->sb; | |
da633a42 | 3947 | |
925a6efb JB |
3948 | if (down_read_trylock(&sb->s_umount)) { |
3949 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
3950 | up_read(&sb->s_umount); | |
3951 | } else { | |
da633a42 MX |
3952 | /* |
3953 | * We needn't worry the filesystem going from r/w to r/o though | |
3954 | * we don't acquire ->s_umount mutex, because the filesystem | |
3955 | * should guarantee the delalloc inodes list be empty after | |
3956 | * the filesystem is readonly(all dirty pages are written to | |
3957 | * the disk). | |
3958 | */ | |
eb73c1b7 | 3959 | btrfs_start_all_delalloc_inodes(root->fs_info, 0); |
98ad69cf | 3960 | if (!current->journal_info) |
199c2a9c | 3961 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
da633a42 MX |
3962 | } |
3963 | } | |
3964 | ||
9ed74f2d | 3965 | /* |
5da9d01b | 3966 | * shrink metadata reservation for delalloc |
9ed74f2d | 3967 | */ |
f4c738c2 JB |
3968 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
3969 | bool wait_ordered) | |
5da9d01b | 3970 | { |
0ca1f7ce | 3971 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3972 | struct btrfs_space_info *space_info; |
663350ac | 3973 | struct btrfs_trans_handle *trans; |
f4c738c2 | 3974 | u64 delalloc_bytes; |
5da9d01b | 3975 | u64 max_reclaim; |
b1953bce | 3976 | long time_left; |
877da174 | 3977 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 3978 | int loops = 0; |
08e007d2 | 3979 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 3980 | |
663350ac | 3981 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 3982 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3983 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3984 | |
3985 | smp_mb(); | |
963d678b MX |
3986 | delalloc_bytes = percpu_counter_sum_positive( |
3987 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 3988 | if (delalloc_bytes == 0) { |
fdb5effd | 3989 | if (trans) |
f4c738c2 | 3990 | return; |
199c2a9c | 3991 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
f4c738c2 | 3992 | return; |
fdb5effd JB |
3993 | } |
3994 | ||
f4c738c2 JB |
3995 | while (delalloc_bytes && loops < 3) { |
3996 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
3997 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
da633a42 | 3998 | btrfs_writeback_inodes_sb_nr(root, nr_pages); |
dea31f52 JB |
3999 | /* |
4000 | * We need to wait for the async pages to actually start before | |
4001 | * we do anything. | |
4002 | */ | |
4003 | wait_event(root->fs_info->async_submit_wait, | |
4004 | !atomic_read(&root->fs_info->async_delalloc_pages)); | |
4005 | ||
08e007d2 MX |
4006 | if (!trans) |
4007 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
4008 | else | |
4009 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 4010 | spin_lock(&space_info->lock); |
08e007d2 | 4011 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
4012 | spin_unlock(&space_info->lock); |
4013 | break; | |
4014 | } | |
0019f10d | 4015 | spin_unlock(&space_info->lock); |
5da9d01b | 4016 | |
36e39c40 | 4017 | loops++; |
f104d044 | 4018 | if (wait_ordered && !trans) { |
199c2a9c | 4019 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
f104d044 | 4020 | } else { |
f4c738c2 | 4021 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4022 | if (time_left) |
4023 | break; | |
4024 | } | |
f4c738c2 | 4025 | smp_mb(); |
963d678b MX |
4026 | delalloc_bytes = percpu_counter_sum_positive( |
4027 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 4028 | } |
5da9d01b YZ |
4029 | } |
4030 | ||
663350ac JB |
4031 | /** |
4032 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4033 | * @root - the root we're allocating for | |
4034 | * @bytes - the number of bytes we want to reserve | |
4035 | * @force - force the commit | |
8bb8ab2e | 4036 | * |
663350ac JB |
4037 | * This will check to make sure that committing the transaction will actually |
4038 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4039 | * will return -ENOSPC. | |
8bb8ab2e | 4040 | */ |
663350ac JB |
4041 | static int may_commit_transaction(struct btrfs_root *root, |
4042 | struct btrfs_space_info *space_info, | |
4043 | u64 bytes, int force) | |
4044 | { | |
4045 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
4046 | struct btrfs_trans_handle *trans; | |
4047 | ||
4048 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4049 | if (trans) | |
4050 | return -EAGAIN; | |
4051 | ||
4052 | if (force) | |
4053 | goto commit; | |
4054 | ||
4055 | /* See if there is enough pinned space to make this reservation */ | |
4056 | spin_lock(&space_info->lock); | |
b150a4f1 JB |
4057 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4058 | bytes) >= 0) { | |
663350ac JB |
4059 | spin_unlock(&space_info->lock); |
4060 | goto commit; | |
4061 | } | |
4062 | spin_unlock(&space_info->lock); | |
4063 | ||
4064 | /* | |
4065 | * See if there is some space in the delayed insertion reservation for | |
4066 | * this reservation. | |
4067 | */ | |
4068 | if (space_info != delayed_rsv->space_info) | |
4069 | return -ENOSPC; | |
4070 | ||
d9b0218f | 4071 | spin_lock(&space_info->lock); |
663350ac | 4072 | spin_lock(&delayed_rsv->lock); |
b150a4f1 JB |
4073 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4074 | bytes - delayed_rsv->size) >= 0) { | |
663350ac | 4075 | spin_unlock(&delayed_rsv->lock); |
d9b0218f | 4076 | spin_unlock(&space_info->lock); |
663350ac JB |
4077 | return -ENOSPC; |
4078 | } | |
4079 | spin_unlock(&delayed_rsv->lock); | |
d9b0218f | 4080 | spin_unlock(&space_info->lock); |
663350ac JB |
4081 | |
4082 | commit: | |
4083 | trans = btrfs_join_transaction(root); | |
4084 | if (IS_ERR(trans)) | |
4085 | return -ENOSPC; | |
4086 | ||
4087 | return btrfs_commit_transaction(trans, root); | |
4088 | } | |
4089 | ||
96c3f433 | 4090 | enum flush_state { |
67b0fd63 JB |
4091 | FLUSH_DELAYED_ITEMS_NR = 1, |
4092 | FLUSH_DELAYED_ITEMS = 2, | |
4093 | FLUSH_DELALLOC = 3, | |
4094 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
4095 | ALLOC_CHUNK = 5, |
4096 | COMMIT_TRANS = 6, | |
96c3f433 JB |
4097 | }; |
4098 | ||
4099 | static int flush_space(struct btrfs_root *root, | |
4100 | struct btrfs_space_info *space_info, u64 num_bytes, | |
4101 | u64 orig_bytes, int state) | |
4102 | { | |
4103 | struct btrfs_trans_handle *trans; | |
4104 | int nr; | |
f4c738c2 | 4105 | int ret = 0; |
96c3f433 JB |
4106 | |
4107 | switch (state) { | |
96c3f433 JB |
4108 | case FLUSH_DELAYED_ITEMS_NR: |
4109 | case FLUSH_DELAYED_ITEMS: | |
4110 | if (state == FLUSH_DELAYED_ITEMS_NR) { | |
4111 | u64 bytes = btrfs_calc_trans_metadata_size(root, 1); | |
4112 | ||
4113 | nr = (int)div64_u64(num_bytes, bytes); | |
4114 | if (!nr) | |
4115 | nr = 1; | |
4116 | nr *= 2; | |
4117 | } else { | |
4118 | nr = -1; | |
4119 | } | |
4120 | trans = btrfs_join_transaction(root); | |
4121 | if (IS_ERR(trans)) { | |
4122 | ret = PTR_ERR(trans); | |
4123 | break; | |
4124 | } | |
4125 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
4126 | btrfs_end_transaction(trans, root); | |
4127 | break; | |
67b0fd63 JB |
4128 | case FLUSH_DELALLOC: |
4129 | case FLUSH_DELALLOC_WAIT: | |
4130 | shrink_delalloc(root, num_bytes, orig_bytes, | |
4131 | state == FLUSH_DELALLOC_WAIT); | |
4132 | break; | |
ea658bad JB |
4133 | case ALLOC_CHUNK: |
4134 | trans = btrfs_join_transaction(root); | |
4135 | if (IS_ERR(trans)) { | |
4136 | ret = PTR_ERR(trans); | |
4137 | break; | |
4138 | } | |
4139 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
4140 | btrfs_get_alloc_profile(root, 0), |
4141 | CHUNK_ALLOC_NO_FORCE); | |
4142 | btrfs_end_transaction(trans, root); | |
4143 | if (ret == -ENOSPC) | |
4144 | ret = 0; | |
4145 | break; | |
96c3f433 JB |
4146 | case COMMIT_TRANS: |
4147 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4148 | break; | |
4149 | default: | |
4150 | ret = -ENOSPC; | |
4151 | break; | |
4152 | } | |
4153 | ||
4154 | return ret; | |
4155 | } | |
4a92b1b8 JB |
4156 | /** |
4157 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4158 | * @root - the root we're allocating for | |
4159 | * @block_rsv - the block_rsv we're allocating for | |
4160 | * @orig_bytes - the number of bytes we want | |
48fc7f7e | 4161 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 4162 | * |
4a92b1b8 JB |
4163 | * This will reserve orgi_bytes number of bytes from the space info associated |
4164 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4165 | * flush out space to make room. It will do this by flushing delalloc if | |
4166 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4167 | * regain reservations will be made and this will fail if there is not enough | |
4168 | * space already. | |
8bb8ab2e | 4169 | */ |
4a92b1b8 | 4170 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 4171 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
4172 | u64 orig_bytes, |
4173 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4174 | { |
f0486c68 | 4175 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 4176 | u64 used; |
8bb8ab2e | 4177 | u64 num_bytes = orig_bytes; |
67b0fd63 | 4178 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 4179 | int ret = 0; |
fdb5effd | 4180 | bool flushing = false; |
9ed74f2d | 4181 | |
8bb8ab2e | 4182 | again: |
fdb5effd | 4183 | ret = 0; |
8bb8ab2e | 4184 | spin_lock(&space_info->lock); |
fdb5effd | 4185 | /* |
08e007d2 MX |
4186 | * We only want to wait if somebody other than us is flushing and we |
4187 | * are actually allowed to flush all things. | |
fdb5effd | 4188 | */ |
08e007d2 MX |
4189 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4190 | space_info->flush) { | |
fdb5effd JB |
4191 | spin_unlock(&space_info->lock); |
4192 | /* | |
4193 | * If we have a trans handle we can't wait because the flusher | |
4194 | * may have to commit the transaction, which would mean we would | |
4195 | * deadlock since we are waiting for the flusher to finish, but | |
4196 | * hold the current transaction open. | |
4197 | */ | |
663350ac | 4198 | if (current->journal_info) |
fdb5effd | 4199 | return -EAGAIN; |
b9688bb8 AJ |
4200 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4201 | /* Must have been killed, return */ | |
4202 | if (ret) | |
fdb5effd JB |
4203 | return -EINTR; |
4204 | ||
4205 | spin_lock(&space_info->lock); | |
4206 | } | |
4207 | ||
4208 | ret = -ENOSPC; | |
2bf64758 JB |
4209 | used = space_info->bytes_used + space_info->bytes_reserved + |
4210 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4211 | space_info->bytes_may_use; | |
9ed74f2d | 4212 | |
8bb8ab2e JB |
4213 | /* |
4214 | * The idea here is that we've not already over-reserved the block group | |
4215 | * then we can go ahead and save our reservation first and then start | |
4216 | * flushing if we need to. Otherwise if we've already overcommitted | |
4217 | * lets start flushing stuff first and then come back and try to make | |
4218 | * our reservation. | |
4219 | */ | |
2bf64758 JB |
4220 | if (used <= space_info->total_bytes) { |
4221 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4222 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4223 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4224 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4225 | ret = 0; |
4226 | } else { | |
4227 | /* | |
4228 | * Ok set num_bytes to orig_bytes since we aren't | |
4229 | * overocmmitted, this way we only try and reclaim what | |
4230 | * we need. | |
4231 | */ | |
4232 | num_bytes = orig_bytes; | |
4233 | } | |
4234 | } else { | |
4235 | /* | |
4236 | * Ok we're over committed, set num_bytes to the overcommitted | |
4237 | * amount plus the amount of bytes that we need for this | |
4238 | * reservation. | |
4239 | */ | |
2bf64758 | 4240 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4241 | (orig_bytes * 2); |
8bb8ab2e | 4242 | } |
9ed74f2d | 4243 | |
44734ed1 JB |
4244 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4245 | space_info->bytes_may_use += orig_bytes; | |
4246 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4247 | space_info->flags, orig_bytes, | |
4248 | 1); | |
4249 | ret = 0; | |
2bf64758 JB |
4250 | } |
4251 | ||
8bb8ab2e JB |
4252 | /* |
4253 | * Couldn't make our reservation, save our place so while we're trying | |
4254 | * to reclaim space we can actually use it instead of somebody else | |
4255 | * stealing it from us. | |
08e007d2 MX |
4256 | * |
4257 | * We make the other tasks wait for the flush only when we can flush | |
4258 | * all things. | |
8bb8ab2e | 4259 | */ |
72bcd99d | 4260 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4261 | flushing = true; |
4262 | space_info->flush = 1; | |
8bb8ab2e | 4263 | } |
9ed74f2d | 4264 | |
f0486c68 | 4265 | spin_unlock(&space_info->lock); |
9ed74f2d | 4266 | |
08e007d2 | 4267 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4268 | goto out; |
f0486c68 | 4269 | |
96c3f433 JB |
4270 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4271 | flush_state); | |
4272 | flush_state++; | |
08e007d2 MX |
4273 | |
4274 | /* | |
4275 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4276 | * would happen. So skip delalloc flush. | |
4277 | */ | |
4278 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4279 | (flush_state == FLUSH_DELALLOC || | |
4280 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4281 | flush_state = ALLOC_CHUNK; | |
4282 | ||
96c3f433 | 4283 | if (!ret) |
8bb8ab2e | 4284 | goto again; |
08e007d2 MX |
4285 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4286 | flush_state < COMMIT_TRANS) | |
4287 | goto again; | |
4288 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4289 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4290 | goto again; |
4291 | ||
4292 | out: | |
5d80366e JB |
4293 | if (ret == -ENOSPC && |
4294 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4295 | struct btrfs_block_rsv *global_rsv = | |
4296 | &root->fs_info->global_block_rsv; | |
4297 | ||
4298 | if (block_rsv != global_rsv && | |
4299 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4300 | ret = 0; | |
4301 | } | |
fdb5effd | 4302 | if (flushing) { |
8bb8ab2e | 4303 | spin_lock(&space_info->lock); |
fdb5effd JB |
4304 | space_info->flush = 0; |
4305 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4306 | spin_unlock(&space_info->lock); |
f0486c68 | 4307 | } |
f0486c68 YZ |
4308 | return ret; |
4309 | } | |
4310 | ||
79787eaa JM |
4311 | static struct btrfs_block_rsv *get_block_rsv( |
4312 | const struct btrfs_trans_handle *trans, | |
4313 | const struct btrfs_root *root) | |
f0486c68 | 4314 | { |
4c13d758 JB |
4315 | struct btrfs_block_rsv *block_rsv = NULL; |
4316 | ||
0e721106 JB |
4317 | if (root->ref_cows) |
4318 | block_rsv = trans->block_rsv; | |
4319 | ||
4320 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
f0486c68 | 4321 | block_rsv = trans->block_rsv; |
4c13d758 JB |
4322 | |
4323 | if (!block_rsv) | |
f0486c68 YZ |
4324 | block_rsv = root->block_rsv; |
4325 | ||
4326 | if (!block_rsv) | |
4327 | block_rsv = &root->fs_info->empty_block_rsv; | |
4328 | ||
4329 | return block_rsv; | |
4330 | } | |
4331 | ||
4332 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4333 | u64 num_bytes) | |
4334 | { | |
4335 | int ret = -ENOSPC; | |
4336 | spin_lock(&block_rsv->lock); | |
4337 | if (block_rsv->reserved >= num_bytes) { | |
4338 | block_rsv->reserved -= num_bytes; | |
4339 | if (block_rsv->reserved < block_rsv->size) | |
4340 | block_rsv->full = 0; | |
4341 | ret = 0; | |
4342 | } | |
4343 | spin_unlock(&block_rsv->lock); | |
4344 | return ret; | |
4345 | } | |
4346 | ||
4347 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4348 | u64 num_bytes, int update_size) | |
4349 | { | |
4350 | spin_lock(&block_rsv->lock); | |
4351 | block_rsv->reserved += num_bytes; | |
4352 | if (update_size) | |
4353 | block_rsv->size += num_bytes; | |
4354 | else if (block_rsv->reserved >= block_rsv->size) | |
4355 | block_rsv->full = 1; | |
4356 | spin_unlock(&block_rsv->lock); | |
4357 | } | |
4358 | ||
d52be818 JB |
4359 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
4360 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
4361 | int min_factor) | |
4362 | { | |
4363 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
4364 | u64 min_bytes; | |
4365 | ||
4366 | if (global_rsv->space_info != dest->space_info) | |
4367 | return -ENOSPC; | |
4368 | ||
4369 | spin_lock(&global_rsv->lock); | |
4370 | min_bytes = div_factor(global_rsv->size, min_factor); | |
4371 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
4372 | spin_unlock(&global_rsv->lock); | |
4373 | return -ENOSPC; | |
4374 | } | |
4375 | global_rsv->reserved -= num_bytes; | |
4376 | if (global_rsv->reserved < global_rsv->size) | |
4377 | global_rsv->full = 0; | |
4378 | spin_unlock(&global_rsv->lock); | |
4379 | ||
4380 | block_rsv_add_bytes(dest, num_bytes, 1); | |
4381 | return 0; | |
4382 | } | |
4383 | ||
8c2a3ca2 JB |
4384 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4385 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4386 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4387 | { |
4388 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4389 | ||
4390 | spin_lock(&block_rsv->lock); | |
4391 | if (num_bytes == (u64)-1) | |
4392 | num_bytes = block_rsv->size; | |
4393 | block_rsv->size -= num_bytes; | |
4394 | if (block_rsv->reserved >= block_rsv->size) { | |
4395 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4396 | block_rsv->reserved = block_rsv->size; | |
4397 | block_rsv->full = 1; | |
4398 | } else { | |
4399 | num_bytes = 0; | |
4400 | } | |
4401 | spin_unlock(&block_rsv->lock); | |
4402 | ||
4403 | if (num_bytes > 0) { | |
4404 | if (dest) { | |
e9e22899 JB |
4405 | spin_lock(&dest->lock); |
4406 | if (!dest->full) { | |
4407 | u64 bytes_to_add; | |
4408 | ||
4409 | bytes_to_add = dest->size - dest->reserved; | |
4410 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4411 | dest->reserved += bytes_to_add; | |
4412 | if (dest->reserved >= dest->size) | |
4413 | dest->full = 1; | |
4414 | num_bytes -= bytes_to_add; | |
4415 | } | |
4416 | spin_unlock(&dest->lock); | |
4417 | } | |
4418 | if (num_bytes) { | |
f0486c68 | 4419 | spin_lock(&space_info->lock); |
fb25e914 | 4420 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4421 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4422 | space_info->flags, num_bytes, 0); |
36e39c40 | 4423 | space_info->reservation_progress++; |
f0486c68 | 4424 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4425 | } |
9ed74f2d | 4426 | } |
f0486c68 | 4427 | } |
4e06bdd6 | 4428 | |
f0486c68 YZ |
4429 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
4430 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4431 | { | |
4432 | int ret; | |
9ed74f2d | 4433 | |
f0486c68 YZ |
4434 | ret = block_rsv_use_bytes(src, num_bytes); |
4435 | if (ret) | |
4436 | return ret; | |
9ed74f2d | 4437 | |
f0486c68 | 4438 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
4439 | return 0; |
4440 | } | |
4441 | ||
66d8f3dd | 4442 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 4443 | { |
f0486c68 YZ |
4444 | memset(rsv, 0, sizeof(*rsv)); |
4445 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 4446 | rsv->type = type; |
f0486c68 YZ |
4447 | } |
4448 | ||
66d8f3dd MX |
4449 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
4450 | unsigned short type) | |
f0486c68 YZ |
4451 | { |
4452 | struct btrfs_block_rsv *block_rsv; | |
4453 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 4454 | |
f0486c68 YZ |
4455 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
4456 | if (!block_rsv) | |
4457 | return NULL; | |
9ed74f2d | 4458 | |
66d8f3dd | 4459 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
4460 | block_rsv->space_info = __find_space_info(fs_info, |
4461 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
4462 | return block_rsv; |
4463 | } | |
9ed74f2d | 4464 | |
f0486c68 YZ |
4465 | void btrfs_free_block_rsv(struct btrfs_root *root, |
4466 | struct btrfs_block_rsv *rsv) | |
4467 | { | |
2aaa6655 JB |
4468 | if (!rsv) |
4469 | return; | |
dabdb640 JB |
4470 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
4471 | kfree(rsv); | |
9ed74f2d JB |
4472 | } |
4473 | ||
08e007d2 MX |
4474 | int btrfs_block_rsv_add(struct btrfs_root *root, |
4475 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4476 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4477 | { |
f0486c68 | 4478 | int ret; |
9ed74f2d | 4479 | |
f0486c68 YZ |
4480 | if (num_bytes == 0) |
4481 | return 0; | |
8bb8ab2e | 4482 | |
61b520a9 | 4483 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
4484 | if (!ret) { |
4485 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
4486 | return 0; | |
4487 | } | |
9ed74f2d | 4488 | |
f0486c68 | 4489 | return ret; |
f0486c68 | 4490 | } |
9ed74f2d | 4491 | |
4a92b1b8 | 4492 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 4493 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
4494 | { |
4495 | u64 num_bytes = 0; | |
f0486c68 | 4496 | int ret = -ENOSPC; |
9ed74f2d | 4497 | |
f0486c68 YZ |
4498 | if (!block_rsv) |
4499 | return 0; | |
9ed74f2d | 4500 | |
f0486c68 | 4501 | spin_lock(&block_rsv->lock); |
36ba022a JB |
4502 | num_bytes = div_factor(block_rsv->size, min_factor); |
4503 | if (block_rsv->reserved >= num_bytes) | |
4504 | ret = 0; | |
4505 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 4506 | |
36ba022a JB |
4507 | return ret; |
4508 | } | |
4509 | ||
08e007d2 MX |
4510 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
4511 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
4512 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
4513 | { |
4514 | u64 num_bytes = 0; | |
4515 | int ret = -ENOSPC; | |
4516 | ||
4517 | if (!block_rsv) | |
4518 | return 0; | |
4519 | ||
4520 | spin_lock(&block_rsv->lock); | |
4521 | num_bytes = min_reserved; | |
13553e52 | 4522 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 4523 | ret = 0; |
13553e52 | 4524 | else |
f0486c68 | 4525 | num_bytes -= block_rsv->reserved; |
f0486c68 | 4526 | spin_unlock(&block_rsv->lock); |
13553e52 | 4527 | |
f0486c68 YZ |
4528 | if (!ret) |
4529 | return 0; | |
4530 | ||
aa38a711 | 4531 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
4532 | if (!ret) { |
4533 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 4534 | return 0; |
6a63209f | 4535 | } |
9ed74f2d | 4536 | |
13553e52 | 4537 | return ret; |
f0486c68 YZ |
4538 | } |
4539 | ||
4540 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
4541 | struct btrfs_block_rsv *dst_rsv, | |
4542 | u64 num_bytes) | |
4543 | { | |
4544 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
4545 | } | |
4546 | ||
4547 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
4548 | struct btrfs_block_rsv *block_rsv, | |
4549 | u64 num_bytes) | |
4550 | { | |
4551 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
4552 | if (global_rsv->full || global_rsv == block_rsv || | |
4553 | block_rsv->space_info != global_rsv->space_info) | |
4554 | global_rsv = NULL; | |
8c2a3ca2 JB |
4555 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
4556 | num_bytes); | |
6a63209f JB |
4557 | } |
4558 | ||
4559 | /* | |
8929ecfa YZ |
4560 | * helper to calculate size of global block reservation. |
4561 | * the desired value is sum of space used by extent tree, | |
4562 | * checksum tree and root tree | |
6a63209f | 4563 | */ |
8929ecfa | 4564 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 4565 | { |
8929ecfa YZ |
4566 | struct btrfs_space_info *sinfo; |
4567 | u64 num_bytes; | |
4568 | u64 meta_used; | |
4569 | u64 data_used; | |
6c41761f | 4570 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 4571 | |
8929ecfa YZ |
4572 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
4573 | spin_lock(&sinfo->lock); | |
4574 | data_used = sinfo->bytes_used; | |
4575 | spin_unlock(&sinfo->lock); | |
33b4d47f | 4576 | |
8929ecfa YZ |
4577 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
4578 | spin_lock(&sinfo->lock); | |
6d48755d JB |
4579 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
4580 | data_used = 0; | |
8929ecfa YZ |
4581 | meta_used = sinfo->bytes_used; |
4582 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 4583 | |
8929ecfa YZ |
4584 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
4585 | csum_size * 2; | |
4586 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 4587 | |
8929ecfa | 4588 | if (num_bytes * 3 > meta_used) |
8e62c2de | 4589 | num_bytes = div64_u64(meta_used, 3); |
ab6e2410 | 4590 | |
8929ecfa YZ |
4591 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
4592 | } | |
6a63209f | 4593 | |
8929ecfa YZ |
4594 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
4595 | { | |
4596 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
4597 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
4598 | u64 num_bytes; | |
6a63209f | 4599 | |
8929ecfa | 4600 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 4601 | |
8929ecfa | 4602 | spin_lock(&sinfo->lock); |
1f699d38 | 4603 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 4604 | |
fdf30d1c | 4605 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
4e06bdd6 | 4606 | |
8929ecfa | 4607 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4608 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4609 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4610 | |
4611 | if (sinfo->total_bytes > num_bytes) { | |
4612 | num_bytes = sinfo->total_bytes - num_bytes; | |
4613 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4614 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 4615 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4616 | sinfo->flags, num_bytes, 1); |
6a63209f | 4617 | } |
6a63209f | 4618 | |
8929ecfa YZ |
4619 | if (block_rsv->reserved >= block_rsv->size) { |
4620 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4621 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4622 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4623 | sinfo->flags, num_bytes, 0); |
36e39c40 | 4624 | sinfo->reservation_progress++; |
8929ecfa YZ |
4625 | block_rsv->reserved = block_rsv->size; |
4626 | block_rsv->full = 1; | |
4627 | } | |
182608c8 | 4628 | |
8929ecfa | 4629 | spin_unlock(&block_rsv->lock); |
1f699d38 | 4630 | spin_unlock(&sinfo->lock); |
6a63209f JB |
4631 | } |
4632 | ||
f0486c68 | 4633 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4634 | { |
f0486c68 | 4635 | struct btrfs_space_info *space_info; |
6a63209f | 4636 | |
f0486c68 YZ |
4637 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4638 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4639 | |
f0486c68 | 4640 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4641 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4642 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4643 | fs_info->trans_block_rsv.space_info = space_info; |
4644 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4645 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4646 | |
8929ecfa YZ |
4647 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4648 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4649 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4650 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
3a6cad90 SB |
4651 | if (fs_info->quota_root) |
4652 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4653 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4654 | |
8929ecfa | 4655 | update_global_block_rsv(fs_info); |
6a63209f JB |
4656 | } |
4657 | ||
8929ecfa | 4658 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4659 | { |
8c2a3ca2 JB |
4660 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
4661 | (u64)-1); | |
8929ecfa YZ |
4662 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
4663 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4664 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4665 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4666 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4667 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4668 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4669 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4670 | } |
4671 | ||
a22285a6 YZ |
4672 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4673 | struct btrfs_root *root) | |
6a63209f | 4674 | { |
0e721106 JB |
4675 | if (!trans->block_rsv) |
4676 | return; | |
4677 | ||
a22285a6 YZ |
4678 | if (!trans->bytes_reserved) |
4679 | return; | |
6a63209f | 4680 | |
e77266e4 | 4681 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 4682 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 4683 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4684 | trans->bytes_reserved = 0; |
4685 | } | |
6a63209f | 4686 | |
79787eaa | 4687 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
4688 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4689 | struct inode *inode) | |
4690 | { | |
4691 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4692 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4693 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4694 | ||
4695 | /* | |
fcb80c2a JB |
4696 | * We need to hold space in order to delete our orphan item once we've |
4697 | * added it, so this takes the reservation so we can release it later | |
4698 | * when we are truly done with the orphan item. | |
d68fc57b | 4699 | */ |
ff5714cc | 4700 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4701 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4702 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 4703 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4704 | } |
4705 | ||
d68fc57b | 4706 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4707 | { |
d68fc57b | 4708 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4709 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4710 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4711 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
4712 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4713 | } | |
97e728d4 | 4714 | |
d5c12070 MX |
4715 | /* |
4716 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
4717 | * root: the root of the parent directory | |
4718 | * rsv: block reservation | |
4719 | * items: the number of items that we need do reservation | |
4720 | * qgroup_reserved: used to return the reserved size in qgroup | |
4721 | * | |
4722 | * This function is used to reserve the space for snapshot/subvolume | |
4723 | * creation and deletion. Those operations are different with the | |
4724 | * common file/directory operations, they change two fs/file trees | |
4725 | * and root tree, the number of items that the qgroup reserves is | |
4726 | * different with the free space reservation. So we can not use | |
4727 | * the space reseravtion mechanism in start_transaction(). | |
4728 | */ | |
4729 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
4730 | struct btrfs_block_rsv *rsv, | |
4731 | int items, | |
4732 | u64 *qgroup_reserved) | |
a22285a6 | 4733 | { |
d5c12070 MX |
4734 | u64 num_bytes; |
4735 | int ret; | |
4736 | ||
4737 | if (root->fs_info->quota_enabled) { | |
4738 | /* One for parent inode, two for dir entries */ | |
4739 | num_bytes = 3 * root->leafsize; | |
4740 | ret = btrfs_qgroup_reserve(root, num_bytes); | |
4741 | if (ret) | |
4742 | return ret; | |
4743 | } else { | |
4744 | num_bytes = 0; | |
4745 | } | |
4746 | ||
4747 | *qgroup_reserved = num_bytes; | |
4748 | ||
4749 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
4750 | rsv->space_info = __find_space_info(root->fs_info, | |
4751 | BTRFS_BLOCK_GROUP_METADATA); | |
4752 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
4753 | BTRFS_RESERVE_FLUSH_ALL); | |
4754 | if (ret) { | |
4755 | if (*qgroup_reserved) | |
4756 | btrfs_qgroup_free(root, *qgroup_reserved); | |
4757 | } | |
4758 | ||
4759 | return ret; | |
4760 | } | |
4761 | ||
4762 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
4763 | struct btrfs_block_rsv *rsv, | |
4764 | u64 qgroup_reserved) | |
4765 | { | |
4766 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
4767 | if (qgroup_reserved) | |
4768 | btrfs_qgroup_free(root, qgroup_reserved); | |
97e728d4 JB |
4769 | } |
4770 | ||
7709cde3 JB |
4771 | /** |
4772 | * drop_outstanding_extent - drop an outstanding extent | |
4773 | * @inode: the inode we're dropping the extent for | |
4774 | * | |
4775 | * This is called when we are freeing up an outstanding extent, either called | |
4776 | * after an error or after an extent is written. This will return the number of | |
4777 | * reserved extents that need to be freed. This must be called with | |
4778 | * BTRFS_I(inode)->lock held. | |
4779 | */ | |
9e0baf60 JB |
4780 | static unsigned drop_outstanding_extent(struct inode *inode) |
4781 | { | |
7fd2ae21 | 4782 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4783 | unsigned dropped_extents = 0; |
4784 | ||
9e0baf60 JB |
4785 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4786 | BTRFS_I(inode)->outstanding_extents--; | |
4787 | ||
7fd2ae21 | 4788 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
4789 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4790 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 4791 | drop_inode_space = 1; |
7fd2ae21 | 4792 | |
9e0baf60 JB |
4793 | /* |
4794 | * If we have more or the same amount of outsanding extents than we have | |
4795 | * reserved then we need to leave the reserved extents count alone. | |
4796 | */ | |
4797 | if (BTRFS_I(inode)->outstanding_extents >= | |
4798 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4799 | return drop_inode_space; |
9e0baf60 JB |
4800 | |
4801 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4802 | BTRFS_I(inode)->outstanding_extents; | |
4803 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4804 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4805 | } |
4806 | ||
7709cde3 JB |
4807 | /** |
4808 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4809 | * reserved/free'd for the given bytes. | |
4810 | * @inode: the inode we're manipulating | |
4811 | * @num_bytes: the number of bytes in question | |
4812 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4813 | * | |
4814 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4815 | * correct amount of metadata that must either be reserved or freed. We | |
4816 | * calculate how many checksums we can fit into one leaf and then divide the | |
4817 | * number of bytes that will need to be checksumed by this value to figure out | |
4818 | * how many checksums will be required. If we are adding bytes then the number | |
4819 | * may go up and we will return the number of additional bytes that must be | |
4820 | * reserved. If it is going down we will return the number of bytes that must | |
4821 | * be freed. | |
4822 | * | |
4823 | * This must be called with BTRFS_I(inode)->lock held. | |
4824 | */ | |
4825 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4826 | int reserve) | |
6324fbf3 | 4827 | { |
7709cde3 JB |
4828 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4829 | u64 csum_size; | |
4830 | int num_csums_per_leaf; | |
4831 | int num_csums; | |
4832 | int old_csums; | |
4833 | ||
4834 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4835 | BTRFS_I(inode)->csum_bytes == 0) | |
4836 | return 0; | |
4837 | ||
4838 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4839 | if (reserve) | |
4840 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4841 | else | |
4842 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4843 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4844 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4845 | sizeof(struct btrfs_csum_item) + | |
4846 | sizeof(struct btrfs_disk_key)); | |
4847 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4848 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4849 | num_csums = num_csums / num_csums_per_leaf; | |
4850 | ||
4851 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4852 | old_csums = old_csums / num_csums_per_leaf; | |
4853 | ||
4854 | /* No change, no need to reserve more */ | |
4855 | if (old_csums == num_csums) | |
4856 | return 0; | |
4857 | ||
4858 | if (reserve) | |
4859 | return btrfs_calc_trans_metadata_size(root, | |
4860 | num_csums - old_csums); | |
4861 | ||
4862 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4863 | } |
c146afad | 4864 | |
0ca1f7ce YZ |
4865 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4866 | { | |
4867 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4868 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4869 | u64 to_reserve = 0; |
660d3f6c | 4870 | u64 csum_bytes; |
9e0baf60 | 4871 | unsigned nr_extents = 0; |
660d3f6c | 4872 | int extra_reserve = 0; |
08e007d2 | 4873 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 4874 | int ret = 0; |
c64c2bd8 | 4875 | bool delalloc_lock = true; |
88e081bf WS |
4876 | u64 to_free = 0; |
4877 | unsigned dropped; | |
6324fbf3 | 4878 | |
c64c2bd8 JB |
4879 | /* If we are a free space inode we need to not flush since we will be in |
4880 | * the middle of a transaction commit. We also don't need the delalloc | |
4881 | * mutex since we won't race with anybody. We need this mostly to make | |
4882 | * lockdep shut its filthy mouth. | |
4883 | */ | |
4884 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 4885 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
4886 | delalloc_lock = false; |
4887 | } | |
c09544e0 | 4888 | |
08e007d2 MX |
4889 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
4890 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4891 | schedule_timeout(1); |
ec44a35c | 4892 | |
c64c2bd8 JB |
4893 | if (delalloc_lock) |
4894 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
4895 | ||
0ca1f7ce | 4896 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4897 | |
9e0baf60 JB |
4898 | spin_lock(&BTRFS_I(inode)->lock); |
4899 | BTRFS_I(inode)->outstanding_extents++; | |
4900 | ||
4901 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4902 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4903 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4904 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4905 | |
7fd2ae21 JB |
4906 | /* |
4907 | * Add an item to reserve for updating the inode when we complete the | |
4908 | * delalloc io. | |
4909 | */ | |
72ac3c0d JB |
4910 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4911 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 4912 | nr_extents++; |
660d3f6c | 4913 | extra_reserve = 1; |
593060d7 | 4914 | } |
7fd2ae21 JB |
4915 | |
4916 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4917 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4918 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4919 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4920 | |
88e081bf | 4921 | if (root->fs_info->quota_enabled) { |
c5567237 AJ |
4922 | ret = btrfs_qgroup_reserve(root, num_bytes + |
4923 | nr_extents * root->leafsize); | |
88e081bf WS |
4924 | if (ret) |
4925 | goto out_fail; | |
4926 | } | |
c5567237 | 4927 | |
88e081bf WS |
4928 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
4929 | if (unlikely(ret)) { | |
4930 | if (root->fs_info->quota_enabled) | |
4b5829a8 MX |
4931 | btrfs_qgroup_free(root, num_bytes + |
4932 | nr_extents * root->leafsize); | |
88e081bf | 4933 | goto out_fail; |
9e0baf60 | 4934 | } |
25179201 | 4935 | |
660d3f6c JB |
4936 | spin_lock(&BTRFS_I(inode)->lock); |
4937 | if (extra_reserve) { | |
72ac3c0d JB |
4938 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4939 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
4940 | nr_extents--; |
4941 | } | |
4942 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
4943 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
4944 | |
4945 | if (delalloc_lock) | |
4946 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 4947 | |
8c2a3ca2 JB |
4948 | if (to_reserve) |
4949 | trace_btrfs_space_reservation(root->fs_info,"delalloc", | |
4950 | btrfs_ino(inode), to_reserve, 1); | |
0ca1f7ce YZ |
4951 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4952 | ||
0ca1f7ce | 4953 | return 0; |
88e081bf WS |
4954 | |
4955 | out_fail: | |
4956 | spin_lock(&BTRFS_I(inode)->lock); | |
4957 | dropped = drop_outstanding_extent(inode); | |
4958 | /* | |
4959 | * If the inodes csum_bytes is the same as the original | |
4960 | * csum_bytes then we know we haven't raced with any free()ers | |
4961 | * so we can just reduce our inodes csum bytes and carry on. | |
88e081bf | 4962 | */ |
f4881bc7 | 4963 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
88e081bf | 4964 | calc_csum_metadata_size(inode, num_bytes, 0); |
f4881bc7 JB |
4965 | } else { |
4966 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
4967 | u64 bytes; | |
4968 | ||
4969 | /* | |
4970 | * This is tricky, but first we need to figure out how much we | |
4971 | * free'd from any free-ers that occured during this | |
4972 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
4973 | * before we dropped our lock, and then call the free for the | |
4974 | * number of bytes that were freed while we were trying our | |
4975 | * reservation. | |
4976 | */ | |
4977 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
4978 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
4979 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
4980 | ||
4981 | ||
4982 | /* | |
4983 | * Now we need to see how much we would have freed had we not | |
4984 | * been making this reservation and our ->csum_bytes were not | |
4985 | * artificially inflated. | |
4986 | */ | |
4987 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
4988 | bytes = csum_bytes - orig_csum_bytes; | |
4989 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
4990 | ||
4991 | /* | |
4992 | * Now reset ->csum_bytes to what it should be. If bytes is | |
4993 | * more than to_free then we would have free'd more space had we | |
4994 | * not had an artificially high ->csum_bytes, so we need to free | |
4995 | * the remainder. If bytes is the same or less then we don't | |
4996 | * need to do anything, the other free-ers did the correct | |
4997 | * thing. | |
4998 | */ | |
4999 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
5000 | if (bytes > to_free) | |
5001 | to_free = bytes - to_free; | |
5002 | else | |
5003 | to_free = 0; | |
5004 | } | |
88e081bf WS |
5005 | spin_unlock(&BTRFS_I(inode)->lock); |
5006 | if (dropped) | |
5007 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
5008 | ||
5009 | if (to_free) { | |
5010 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
5011 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5012 | btrfs_ino(inode), to_free, 0); | |
5013 | } | |
5014 | if (delalloc_lock) | |
5015 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
5016 | return ret; | |
0ca1f7ce YZ |
5017 | } |
5018 | ||
7709cde3 JB |
5019 | /** |
5020 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
5021 | * @inode: the inode to release the reservation for | |
5022 | * @num_bytes: the number of bytes we're releasing | |
5023 | * | |
5024 | * This will release the metadata reservation for an inode. This can be called | |
5025 | * once we complete IO for a given set of bytes to release their metadata | |
5026 | * reservations. | |
5027 | */ | |
0ca1f7ce YZ |
5028 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
5029 | { | |
5030 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
5031 | u64 to_free = 0; |
5032 | unsigned dropped; | |
0ca1f7ce YZ |
5033 | |
5034 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 5035 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 5036 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 5037 | |
0934856d MX |
5038 | if (num_bytes) |
5039 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 5040 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
5041 | if (dropped > 0) |
5042 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 5043 | |
8c2a3ca2 JB |
5044 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
5045 | btrfs_ino(inode), to_free, 0); | |
c5567237 AJ |
5046 | if (root->fs_info->quota_enabled) { |
5047 | btrfs_qgroup_free(root, num_bytes + | |
5048 | dropped * root->leafsize); | |
5049 | } | |
5050 | ||
0ca1f7ce YZ |
5051 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
5052 | to_free); | |
5053 | } | |
5054 | ||
7709cde3 JB |
5055 | /** |
5056 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
5057 | * @inode: inode we're writing to | |
5058 | * @num_bytes: the number of bytes we want to allocate | |
5059 | * | |
5060 | * This will do the following things | |
5061 | * | |
5062 | * o reserve space in the data space info for num_bytes | |
5063 | * o reserve space in the metadata space info based on number of outstanding | |
5064 | * extents and how much csums will be needed | |
5065 | * o add to the inodes ->delalloc_bytes | |
5066 | * o add it to the fs_info's delalloc inodes list. | |
5067 | * | |
5068 | * This will return 0 for success and -ENOSPC if there is no space left. | |
5069 | */ | |
0ca1f7ce YZ |
5070 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
5071 | { | |
5072 | int ret; | |
5073 | ||
5074 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 5075 | if (ret) |
0ca1f7ce YZ |
5076 | return ret; |
5077 | ||
5078 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
5079 | if (ret) { | |
5080 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5081 | return ret; | |
5082 | } | |
5083 | ||
5084 | return 0; | |
5085 | } | |
5086 | ||
7709cde3 JB |
5087 | /** |
5088 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
5089 | * @inode: inode we're releasing space for | |
5090 | * @num_bytes: the number of bytes we want to free up | |
5091 | * | |
5092 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
5093 | * called in the case that we don't need the metadata AND data reservations | |
5094 | * anymore. So if there is an error or we insert an inline extent. | |
5095 | * | |
5096 | * This function will release the metadata space that was not used and will | |
5097 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
5098 | * list if there are no delalloc bytes left. | |
5099 | */ | |
0ca1f7ce YZ |
5100 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
5101 | { | |
5102 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
5103 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
5104 | } |
5105 | ||
c53d613e | 5106 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 5107 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 5108 | { |
0af3d00b | 5109 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 5110 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 5111 | u64 total = num_bytes; |
9078a3e1 | 5112 | u64 old_val; |
db94535d | 5113 | u64 byte_in_group; |
0af3d00b | 5114 | int factor; |
3e1ad54f | 5115 | |
5d4f98a2 | 5116 | /* block accounting for super block */ |
eb73c1b7 | 5117 | spin_lock(&info->delalloc_root_lock); |
6c41761f | 5118 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
5119 | if (alloc) |
5120 | old_val += num_bytes; | |
5121 | else | |
5122 | old_val -= num_bytes; | |
6c41761f | 5123 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
eb73c1b7 | 5124 | spin_unlock(&info->delalloc_root_lock); |
5d4f98a2 | 5125 | |
d397712b | 5126 | while (total) { |
db94535d | 5127 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 5128 | if (!cache) |
79787eaa | 5129 | return -ENOENT; |
b742bb82 YZ |
5130 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
5131 | BTRFS_BLOCK_GROUP_RAID1 | | |
5132 | BTRFS_BLOCK_GROUP_RAID10)) | |
5133 | factor = 2; | |
5134 | else | |
5135 | factor = 1; | |
9d66e233 JB |
5136 | /* |
5137 | * If this block group has free space cache written out, we | |
5138 | * need to make sure to load it if we are removing space. This | |
5139 | * is because we need the unpinning stage to actually add the | |
5140 | * space back to the block group, otherwise we will leak space. | |
5141 | */ | |
5142 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 5143 | cache_block_group(cache, 1); |
0af3d00b | 5144 | |
db94535d CM |
5145 | byte_in_group = bytenr - cache->key.objectid; |
5146 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 5147 | |
25179201 | 5148 | spin_lock(&cache->space_info->lock); |
c286ac48 | 5149 | spin_lock(&cache->lock); |
0af3d00b | 5150 | |
73bc1876 | 5151 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
5152 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
5153 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
5154 | ||
0f9dd46c | 5155 | cache->dirty = 1; |
9078a3e1 | 5156 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 5157 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 5158 | if (alloc) { |
db94535d | 5159 | old_val += num_bytes; |
11833d66 YZ |
5160 | btrfs_set_block_group_used(&cache->item, old_val); |
5161 | cache->reserved -= num_bytes; | |
11833d66 | 5162 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
5163 | cache->space_info->bytes_used += num_bytes; |
5164 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 5165 | spin_unlock(&cache->lock); |
25179201 | 5166 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 5167 | } else { |
db94535d | 5168 | old_val -= num_bytes; |
c286ac48 | 5169 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
5170 | cache->pinned += num_bytes; |
5171 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 5172 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 5173 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 5174 | spin_unlock(&cache->lock); |
25179201 | 5175 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 5176 | |
f0486c68 YZ |
5177 | set_extent_dirty(info->pinned_extents, |
5178 | bytenr, bytenr + num_bytes - 1, | |
5179 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 5180 | } |
fa9c0d79 | 5181 | btrfs_put_block_group(cache); |
db94535d CM |
5182 | total -= num_bytes; |
5183 | bytenr += num_bytes; | |
9078a3e1 CM |
5184 | } |
5185 | return 0; | |
5186 | } | |
6324fbf3 | 5187 | |
a061fc8d CM |
5188 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
5189 | { | |
0f9dd46c | 5190 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 5191 | u64 bytenr; |
0f9dd46c | 5192 | |
a1897fdd LB |
5193 | spin_lock(&root->fs_info->block_group_cache_lock); |
5194 | bytenr = root->fs_info->first_logical_byte; | |
5195 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5196 | ||
5197 | if (bytenr < (u64)-1) | |
5198 | return bytenr; | |
5199 | ||
0f9dd46c JB |
5200 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
5201 | if (!cache) | |
a061fc8d | 5202 | return 0; |
0f9dd46c | 5203 | |
d2fb3437 | 5204 | bytenr = cache->key.objectid; |
fa9c0d79 | 5205 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
5206 | |
5207 | return bytenr; | |
a061fc8d CM |
5208 | } |
5209 | ||
f0486c68 YZ |
5210 | static int pin_down_extent(struct btrfs_root *root, |
5211 | struct btrfs_block_group_cache *cache, | |
5212 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 5213 | { |
11833d66 YZ |
5214 | spin_lock(&cache->space_info->lock); |
5215 | spin_lock(&cache->lock); | |
5216 | cache->pinned += num_bytes; | |
5217 | cache->space_info->bytes_pinned += num_bytes; | |
5218 | if (reserved) { | |
5219 | cache->reserved -= num_bytes; | |
5220 | cache->space_info->bytes_reserved -= num_bytes; | |
5221 | } | |
5222 | spin_unlock(&cache->lock); | |
5223 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 5224 | |
f0486c68 YZ |
5225 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
5226 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
5227 | return 0; | |
5228 | } | |
68b38550 | 5229 | |
f0486c68 YZ |
5230 | /* |
5231 | * this function must be called within transaction | |
5232 | */ | |
5233 | int btrfs_pin_extent(struct btrfs_root *root, | |
5234 | u64 bytenr, u64 num_bytes, int reserved) | |
5235 | { | |
5236 | struct btrfs_block_group_cache *cache; | |
68b38550 | 5237 | |
f0486c68 | 5238 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 5239 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
5240 | |
5241 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5242 | ||
5243 | btrfs_put_block_group(cache); | |
11833d66 YZ |
5244 | return 0; |
5245 | } | |
5246 | ||
f0486c68 | 5247 | /* |
e688b725 CM |
5248 | * this function must be called within transaction |
5249 | */ | |
dcfac415 | 5250 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
5251 | u64 bytenr, u64 num_bytes) |
5252 | { | |
5253 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 5254 | int ret; |
e688b725 CM |
5255 | |
5256 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
b50c6e25 JB |
5257 | if (!cache) |
5258 | return -EINVAL; | |
e688b725 CM |
5259 | |
5260 | /* | |
5261 | * pull in the free space cache (if any) so that our pin | |
5262 | * removes the free space from the cache. We have load_only set | |
5263 | * to one because the slow code to read in the free extents does check | |
5264 | * the pinned extents. | |
5265 | */ | |
f6373bf3 | 5266 | cache_block_group(cache, 1); |
e688b725 CM |
5267 | |
5268 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5269 | ||
5270 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 5271 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 5272 | btrfs_put_block_group(cache); |
b50c6e25 | 5273 | return ret; |
e688b725 CM |
5274 | } |
5275 | ||
8c2a1a30 JB |
5276 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
5277 | { | |
5278 | int ret; | |
5279 | struct btrfs_block_group_cache *block_group; | |
5280 | struct btrfs_caching_control *caching_ctl; | |
5281 | ||
5282 | block_group = btrfs_lookup_block_group(root->fs_info, start); | |
5283 | if (!block_group) | |
5284 | return -EINVAL; | |
5285 | ||
5286 | cache_block_group(block_group, 0); | |
5287 | caching_ctl = get_caching_control(block_group); | |
5288 | ||
5289 | if (!caching_ctl) { | |
5290 | /* Logic error */ | |
5291 | BUG_ON(!block_group_cache_done(block_group)); | |
5292 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5293 | } else { | |
5294 | mutex_lock(&caching_ctl->mutex); | |
5295 | ||
5296 | if (start >= caching_ctl->progress) { | |
5297 | ret = add_excluded_extent(root, start, num_bytes); | |
5298 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5299 | ret = btrfs_remove_free_space(block_group, | |
5300 | start, num_bytes); | |
5301 | } else { | |
5302 | num_bytes = caching_ctl->progress - start; | |
5303 | ret = btrfs_remove_free_space(block_group, | |
5304 | start, num_bytes); | |
5305 | if (ret) | |
5306 | goto out_lock; | |
5307 | ||
5308 | num_bytes = (start + num_bytes) - | |
5309 | caching_ctl->progress; | |
5310 | start = caching_ctl->progress; | |
5311 | ret = add_excluded_extent(root, start, num_bytes); | |
5312 | } | |
5313 | out_lock: | |
5314 | mutex_unlock(&caching_ctl->mutex); | |
5315 | put_caching_control(caching_ctl); | |
5316 | } | |
5317 | btrfs_put_block_group(block_group); | |
5318 | return ret; | |
5319 | } | |
5320 | ||
5321 | int btrfs_exclude_logged_extents(struct btrfs_root *log, | |
5322 | struct extent_buffer *eb) | |
5323 | { | |
5324 | struct btrfs_file_extent_item *item; | |
5325 | struct btrfs_key key; | |
5326 | int found_type; | |
5327 | int i; | |
5328 | ||
5329 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) | |
5330 | return 0; | |
5331 | ||
5332 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
5333 | btrfs_item_key_to_cpu(eb, &key, i); | |
5334 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
5335 | continue; | |
5336 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
5337 | found_type = btrfs_file_extent_type(eb, item); | |
5338 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
5339 | continue; | |
5340 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
5341 | continue; | |
5342 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
5343 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
5344 | __exclude_logged_extent(log, key.objectid, key.offset); | |
5345 | } | |
5346 | ||
5347 | return 0; | |
5348 | } | |
5349 | ||
fb25e914 JB |
5350 | /** |
5351 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5352 | * @cache: The cache we are manipulating | |
5353 | * @num_bytes: The number of bytes in question | |
5354 | * @reserve: One of the reservation enums | |
5355 | * | |
5356 | * This is called by the allocator when it reserves space, or by somebody who is | |
5357 | * freeing space that was never actually used on disk. For example if you | |
5358 | * reserve some space for a new leaf in transaction A and before transaction A | |
5359 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5360 | * clear the reservation. | |
5361 | * | |
5362 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5363 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5364 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5365 | * allocating less disk space for the amount of data we have reserved in the | |
5366 | * case of compression. | |
5367 | * | |
5368 | * If this is a reservation and the block group has become read only we cannot | |
5369 | * make the reservation and return -EAGAIN, otherwise this function always | |
5370 | * succeeds. | |
f0486c68 | 5371 | */ |
fb25e914 JB |
5372 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
5373 | u64 num_bytes, int reserve) | |
11833d66 | 5374 | { |
fb25e914 | 5375 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5376 | int ret = 0; |
79787eaa | 5377 | |
fb25e914 JB |
5378 | spin_lock(&space_info->lock); |
5379 | spin_lock(&cache->lock); | |
5380 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5381 | if (cache->ro) { |
5382 | ret = -EAGAIN; | |
5383 | } else { | |
fb25e914 JB |
5384 | cache->reserved += num_bytes; |
5385 | space_info->bytes_reserved += num_bytes; | |
5386 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 5387 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
5388 | "space_info", space_info->flags, |
5389 | num_bytes, 0); | |
fb25e914 JB |
5390 | space_info->bytes_may_use -= num_bytes; |
5391 | } | |
f0486c68 | 5392 | } |
fb25e914 JB |
5393 | } else { |
5394 | if (cache->ro) | |
5395 | space_info->bytes_readonly += num_bytes; | |
5396 | cache->reserved -= num_bytes; | |
5397 | space_info->bytes_reserved -= num_bytes; | |
5398 | space_info->reservation_progress++; | |
324ae4df | 5399 | } |
fb25e914 JB |
5400 | spin_unlock(&cache->lock); |
5401 | spin_unlock(&space_info->lock); | |
f0486c68 | 5402 | return ret; |
324ae4df | 5403 | } |
9078a3e1 | 5404 | |
143bede5 | 5405 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 5406 | struct btrfs_root *root) |
e8569813 | 5407 | { |
e8569813 | 5408 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
5409 | struct btrfs_caching_control *next; |
5410 | struct btrfs_caching_control *caching_ctl; | |
5411 | struct btrfs_block_group_cache *cache; | |
b150a4f1 | 5412 | struct btrfs_space_info *space_info; |
e8569813 | 5413 | |
11833d66 | 5414 | down_write(&fs_info->extent_commit_sem); |
25179201 | 5415 | |
11833d66 YZ |
5416 | list_for_each_entry_safe(caching_ctl, next, |
5417 | &fs_info->caching_block_groups, list) { | |
5418 | cache = caching_ctl->block_group; | |
5419 | if (block_group_cache_done(cache)) { | |
5420 | cache->last_byte_to_unpin = (u64)-1; | |
5421 | list_del_init(&caching_ctl->list); | |
5422 | put_caching_control(caching_ctl); | |
e8569813 | 5423 | } else { |
11833d66 | 5424 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 5425 | } |
e8569813 | 5426 | } |
11833d66 YZ |
5427 | |
5428 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5429 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5430 | else | |
5431 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5432 | ||
5433 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa | 5434 | |
b150a4f1 JB |
5435 | list_for_each_entry_rcu(space_info, &fs_info->space_info, list) |
5436 | percpu_counter_set(&space_info->total_bytes_pinned, 0); | |
5437 | ||
8929ecfa | 5438 | update_global_block_rsv(fs_info); |
e8569813 ZY |
5439 | } |
5440 | ||
11833d66 | 5441 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 5442 | { |
11833d66 YZ |
5443 | struct btrfs_fs_info *fs_info = root->fs_info; |
5444 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
5445 | struct btrfs_space_info *space_info; |
5446 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 5447 | u64 len; |
7b398f8e | 5448 | bool readonly; |
ccd467d6 | 5449 | |
11833d66 | 5450 | while (start <= end) { |
7b398f8e | 5451 | readonly = false; |
11833d66 YZ |
5452 | if (!cache || |
5453 | start >= cache->key.objectid + cache->key.offset) { | |
5454 | if (cache) | |
5455 | btrfs_put_block_group(cache); | |
5456 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 5457 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
5458 | } |
5459 | ||
5460 | len = cache->key.objectid + cache->key.offset - start; | |
5461 | len = min(len, end + 1 - start); | |
5462 | ||
5463 | if (start < cache->last_byte_to_unpin) { | |
5464 | len = min(len, cache->last_byte_to_unpin - start); | |
5465 | btrfs_add_free_space(cache, start, len); | |
5466 | } | |
5467 | ||
f0486c68 | 5468 | start += len; |
7b398f8e | 5469 | space_info = cache->space_info; |
f0486c68 | 5470 | |
7b398f8e | 5471 | spin_lock(&space_info->lock); |
11833d66 YZ |
5472 | spin_lock(&cache->lock); |
5473 | cache->pinned -= len; | |
7b398f8e JB |
5474 | space_info->bytes_pinned -= len; |
5475 | if (cache->ro) { | |
5476 | space_info->bytes_readonly += len; | |
5477 | readonly = true; | |
5478 | } | |
11833d66 | 5479 | spin_unlock(&cache->lock); |
7b398f8e JB |
5480 | if (!readonly && global_rsv->space_info == space_info) { |
5481 | spin_lock(&global_rsv->lock); | |
5482 | if (!global_rsv->full) { | |
5483 | len = min(len, global_rsv->size - | |
5484 | global_rsv->reserved); | |
5485 | global_rsv->reserved += len; | |
5486 | space_info->bytes_may_use += len; | |
5487 | if (global_rsv->reserved >= global_rsv->size) | |
5488 | global_rsv->full = 1; | |
5489 | } | |
5490 | spin_unlock(&global_rsv->lock); | |
5491 | } | |
5492 | spin_unlock(&space_info->lock); | |
ccd467d6 | 5493 | } |
11833d66 YZ |
5494 | |
5495 | if (cache) | |
5496 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
5497 | return 0; |
5498 | } | |
5499 | ||
5500 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 5501 | struct btrfs_root *root) |
a28ec197 | 5502 | { |
11833d66 YZ |
5503 | struct btrfs_fs_info *fs_info = root->fs_info; |
5504 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
5505 | u64 start; |
5506 | u64 end; | |
a28ec197 | 5507 | int ret; |
a28ec197 | 5508 | |
79787eaa JM |
5509 | if (trans->aborted) |
5510 | return 0; | |
5511 | ||
11833d66 YZ |
5512 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
5513 | unpin = &fs_info->freed_extents[1]; | |
5514 | else | |
5515 | unpin = &fs_info->freed_extents[0]; | |
5516 | ||
d397712b | 5517 | while (1) { |
1a5bc167 | 5518 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 5519 | EXTENT_DIRTY, NULL); |
1a5bc167 | 5520 | if (ret) |
a28ec197 | 5521 | break; |
1f3c79a2 | 5522 | |
5378e607 LD |
5523 | if (btrfs_test_opt(root, DISCARD)) |
5524 | ret = btrfs_discard_extent(root, start, | |
5525 | end + 1 - start, NULL); | |
1f3c79a2 | 5526 | |
1a5bc167 | 5527 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 5528 | unpin_extent_range(root, start, end); |
b9473439 | 5529 | cond_resched(); |
a28ec197 | 5530 | } |
817d52f8 | 5531 | |
e20d96d6 CM |
5532 | return 0; |
5533 | } | |
5534 | ||
b150a4f1 JB |
5535 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
5536 | u64 owner, u64 root_objectid) | |
5537 | { | |
5538 | struct btrfs_space_info *space_info; | |
5539 | u64 flags; | |
5540 | ||
5541 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
5542 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) | |
5543 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
5544 | else | |
5545 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
5546 | } else { | |
5547 | flags = BTRFS_BLOCK_GROUP_DATA; | |
5548 | } | |
5549 | ||
5550 | space_info = __find_space_info(fs_info, flags); | |
5551 | BUG_ON(!space_info); /* Logic bug */ | |
5552 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); | |
5553 | } | |
5554 | ||
5555 | ||
5d4f98a2 YZ |
5556 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
5557 | struct btrfs_root *root, | |
5558 | u64 bytenr, u64 num_bytes, u64 parent, | |
5559 | u64 root_objectid, u64 owner_objectid, | |
5560 | u64 owner_offset, int refs_to_drop, | |
5561 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 5562 | { |
e2fa7227 | 5563 | struct btrfs_key key; |
5d4f98a2 | 5564 | struct btrfs_path *path; |
1261ec42 CM |
5565 | struct btrfs_fs_info *info = root->fs_info; |
5566 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 5567 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
5568 | struct btrfs_extent_item *ei; |
5569 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 5570 | int ret; |
5d4f98a2 | 5571 | int is_data; |
952fccac CM |
5572 | int extent_slot = 0; |
5573 | int found_extent = 0; | |
5574 | int num_to_del = 1; | |
5d4f98a2 YZ |
5575 | u32 item_size; |
5576 | u64 refs; | |
3173a18f JB |
5577 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
5578 | SKINNY_METADATA); | |
037e6390 | 5579 | |
5caf2a00 | 5580 | path = btrfs_alloc_path(); |
54aa1f4d CM |
5581 | if (!path) |
5582 | return -ENOMEM; | |
5f26f772 | 5583 | |
3c12ac72 | 5584 | path->reada = 1; |
b9473439 | 5585 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5586 | |
5587 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
5588 | BUG_ON(!is_data && refs_to_drop != 1); | |
5589 | ||
3173a18f JB |
5590 | if (is_data) |
5591 | skinny_metadata = 0; | |
5592 | ||
5d4f98a2 YZ |
5593 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
5594 | bytenr, num_bytes, parent, | |
5595 | root_objectid, owner_objectid, | |
5596 | owner_offset); | |
7bb86316 | 5597 | if (ret == 0) { |
952fccac | 5598 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
5599 | while (extent_slot >= 0) { |
5600 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 5601 | extent_slot); |
5d4f98a2 | 5602 | if (key.objectid != bytenr) |
952fccac | 5603 | break; |
5d4f98a2 YZ |
5604 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
5605 | key.offset == num_bytes) { | |
952fccac CM |
5606 | found_extent = 1; |
5607 | break; | |
5608 | } | |
3173a18f JB |
5609 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
5610 | key.offset == owner_objectid) { | |
5611 | found_extent = 1; | |
5612 | break; | |
5613 | } | |
952fccac CM |
5614 | if (path->slots[0] - extent_slot > 5) |
5615 | break; | |
5d4f98a2 | 5616 | extent_slot--; |
952fccac | 5617 | } |
5d4f98a2 YZ |
5618 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
5619 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
5620 | if (found_extent && item_size < sizeof(*ei)) | |
5621 | found_extent = 0; | |
5622 | #endif | |
31840ae1 | 5623 | if (!found_extent) { |
5d4f98a2 | 5624 | BUG_ON(iref); |
56bec294 | 5625 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
5626 | NULL, refs_to_drop, |
5627 | is_data); | |
005d6427 DS |
5628 | if (ret) { |
5629 | btrfs_abort_transaction(trans, extent_root, ret); | |
5630 | goto out; | |
5631 | } | |
b3b4aa74 | 5632 | btrfs_release_path(path); |
b9473439 | 5633 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5634 | |
5635 | key.objectid = bytenr; | |
5636 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5637 | key.offset = num_bytes; | |
5638 | ||
3173a18f JB |
5639 | if (!is_data && skinny_metadata) { |
5640 | key.type = BTRFS_METADATA_ITEM_KEY; | |
5641 | key.offset = owner_objectid; | |
5642 | } | |
5643 | ||
31840ae1 ZY |
5644 | ret = btrfs_search_slot(trans, extent_root, |
5645 | &key, path, -1, 1); | |
3173a18f JB |
5646 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
5647 | /* | |
5648 | * Couldn't find our skinny metadata item, | |
5649 | * see if we have ye olde extent item. | |
5650 | */ | |
5651 | path->slots[0]--; | |
5652 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
5653 | path->slots[0]); | |
5654 | if (key.objectid == bytenr && | |
5655 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
5656 | key.offset == num_bytes) | |
5657 | ret = 0; | |
5658 | } | |
5659 | ||
5660 | if (ret > 0 && skinny_metadata) { | |
5661 | skinny_metadata = false; | |
5662 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5663 | key.offset = num_bytes; | |
5664 | btrfs_release_path(path); | |
5665 | ret = btrfs_search_slot(trans, extent_root, | |
5666 | &key, path, -1, 1); | |
5667 | } | |
5668 | ||
f3465ca4 | 5669 | if (ret) { |
c2cf52eb SK |
5670 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
5671 | ret, (unsigned long long)bytenr); | |
b783e62d JB |
5672 | if (ret > 0) |
5673 | btrfs_print_leaf(extent_root, | |
5674 | path->nodes[0]); | |
f3465ca4 | 5675 | } |
005d6427 DS |
5676 | if (ret < 0) { |
5677 | btrfs_abort_transaction(trans, extent_root, ret); | |
5678 | goto out; | |
5679 | } | |
31840ae1 ZY |
5680 | extent_slot = path->slots[0]; |
5681 | } | |
79787eaa | 5682 | } else if (ret == -ENOENT) { |
7bb86316 CM |
5683 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5684 | WARN_ON(1); | |
c2cf52eb SK |
5685 | btrfs_err(info, |
5686 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
5687 | (unsigned long long)bytenr, | |
5688 | (unsigned long long)parent, | |
5689 | (unsigned long long)root_objectid, | |
5690 | (unsigned long long)owner_objectid, | |
5691 | (unsigned long long)owner_offset); | |
79787eaa | 5692 | } else { |
005d6427 DS |
5693 | btrfs_abort_transaction(trans, extent_root, ret); |
5694 | goto out; | |
7bb86316 | 5695 | } |
5f39d397 CM |
5696 | |
5697 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
5698 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
5699 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
5700 | if (item_size < sizeof(*ei)) { | |
5701 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
5702 | ret = convert_extent_item_v0(trans, extent_root, path, | |
5703 | owner_objectid, 0); | |
005d6427 DS |
5704 | if (ret < 0) { |
5705 | btrfs_abort_transaction(trans, extent_root, ret); | |
5706 | goto out; | |
5707 | } | |
5d4f98a2 | 5708 | |
b3b4aa74 | 5709 | btrfs_release_path(path); |
5d4f98a2 YZ |
5710 | path->leave_spinning = 1; |
5711 | ||
5712 | key.objectid = bytenr; | |
5713 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5714 | key.offset = num_bytes; | |
5715 | ||
5716 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
5717 | -1, 1); | |
5718 | if (ret) { | |
c2cf52eb SK |
5719 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
5720 | ret, (unsigned long long)bytenr); | |
5d4f98a2 YZ |
5721 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5722 | } | |
005d6427 DS |
5723 | if (ret < 0) { |
5724 | btrfs_abort_transaction(trans, extent_root, ret); | |
5725 | goto out; | |
5726 | } | |
5727 | ||
5d4f98a2 YZ |
5728 | extent_slot = path->slots[0]; |
5729 | leaf = path->nodes[0]; | |
5730 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
5731 | } | |
5732 | #endif | |
5733 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 5734 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 5735 | struct btrfs_extent_item); |
3173a18f JB |
5736 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
5737 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
5738 | struct btrfs_tree_block_info *bi; |
5739 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
5740 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
5741 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
5742 | } | |
56bec294 | 5743 | |
5d4f98a2 | 5744 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 JB |
5745 | if (refs < refs_to_drop) { |
5746 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " | |
5747 | "for bytenr %Lu\n", refs_to_drop, refs, bytenr); | |
5748 | ret = -EINVAL; | |
5749 | btrfs_abort_transaction(trans, extent_root, ret); | |
5750 | goto out; | |
5751 | } | |
56bec294 | 5752 | refs -= refs_to_drop; |
5f39d397 | 5753 | |
5d4f98a2 YZ |
5754 | if (refs > 0) { |
5755 | if (extent_op) | |
5756 | __run_delayed_extent_op(extent_op, leaf, ei); | |
5757 | /* | |
5758 | * In the case of inline back ref, reference count will | |
5759 | * be updated by remove_extent_backref | |
952fccac | 5760 | */ |
5d4f98a2 YZ |
5761 | if (iref) { |
5762 | BUG_ON(!found_extent); | |
5763 | } else { | |
5764 | btrfs_set_extent_refs(leaf, ei, refs); | |
5765 | btrfs_mark_buffer_dirty(leaf); | |
5766 | } | |
5767 | if (found_extent) { | |
5768 | ret = remove_extent_backref(trans, extent_root, path, | |
5769 | iref, refs_to_drop, | |
5770 | is_data); | |
005d6427 DS |
5771 | if (ret) { |
5772 | btrfs_abort_transaction(trans, extent_root, ret); | |
5773 | goto out; | |
5774 | } | |
952fccac | 5775 | } |
b150a4f1 JB |
5776 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
5777 | root_objectid); | |
5d4f98a2 | 5778 | } else { |
5d4f98a2 YZ |
5779 | if (found_extent) { |
5780 | BUG_ON(is_data && refs_to_drop != | |
5781 | extent_data_ref_count(root, path, iref)); | |
5782 | if (iref) { | |
5783 | BUG_ON(path->slots[0] != extent_slot); | |
5784 | } else { | |
5785 | BUG_ON(path->slots[0] != extent_slot + 1); | |
5786 | path->slots[0] = extent_slot; | |
5787 | num_to_del = 2; | |
5788 | } | |
78fae27e | 5789 | } |
b9473439 | 5790 | |
952fccac CM |
5791 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
5792 | num_to_del); | |
005d6427 DS |
5793 | if (ret) { |
5794 | btrfs_abort_transaction(trans, extent_root, ret); | |
5795 | goto out; | |
5796 | } | |
b3b4aa74 | 5797 | btrfs_release_path(path); |
21af804c | 5798 | |
5d4f98a2 | 5799 | if (is_data) { |
459931ec | 5800 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
5801 | if (ret) { |
5802 | btrfs_abort_transaction(trans, extent_root, ret); | |
5803 | goto out; | |
5804 | } | |
459931ec CM |
5805 | } |
5806 | ||
c53d613e | 5807 | ret = update_block_group(root, bytenr, num_bytes, 0); |
005d6427 DS |
5808 | if (ret) { |
5809 | btrfs_abort_transaction(trans, extent_root, ret); | |
5810 | goto out; | |
5811 | } | |
a28ec197 | 5812 | } |
79787eaa | 5813 | out: |
5caf2a00 | 5814 | btrfs_free_path(path); |
a28ec197 CM |
5815 | return ret; |
5816 | } | |
5817 | ||
1887be66 | 5818 | /* |
f0486c68 | 5819 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
5820 | * delayed ref for that extent as well. This searches the delayed ref tree for |
5821 | * a given extent, and if there are no other delayed refs to be processed, it | |
5822 | * removes it from the tree. | |
5823 | */ | |
5824 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
5825 | struct btrfs_root *root, u64 bytenr) | |
5826 | { | |
5827 | struct btrfs_delayed_ref_head *head; | |
5828 | struct btrfs_delayed_ref_root *delayed_refs; | |
5829 | struct btrfs_delayed_ref_node *ref; | |
5830 | struct rb_node *node; | |
f0486c68 | 5831 | int ret = 0; |
1887be66 CM |
5832 | |
5833 | delayed_refs = &trans->transaction->delayed_refs; | |
5834 | spin_lock(&delayed_refs->lock); | |
5835 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
5836 | if (!head) | |
5837 | goto out; | |
5838 | ||
5839 | node = rb_prev(&head->node.rb_node); | |
5840 | if (!node) | |
5841 | goto out; | |
5842 | ||
5843 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
5844 | ||
5845 | /* there are still entries for this ref, we can't drop it */ | |
5846 | if (ref->bytenr == bytenr) | |
5847 | goto out; | |
5848 | ||
5d4f98a2 YZ |
5849 | if (head->extent_op) { |
5850 | if (!head->must_insert_reserved) | |
5851 | goto out; | |
78a6184a | 5852 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
5853 | head->extent_op = NULL; |
5854 | } | |
5855 | ||
1887be66 CM |
5856 | /* |
5857 | * waiting for the lock here would deadlock. If someone else has it | |
5858 | * locked they are already in the process of dropping it anyway | |
5859 | */ | |
5860 | if (!mutex_trylock(&head->mutex)) | |
5861 | goto out; | |
5862 | ||
5863 | /* | |
5864 | * at this point we have a head with no other entries. Go | |
5865 | * ahead and process it. | |
5866 | */ | |
5867 | head->node.in_tree = 0; | |
5868 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 5869 | |
1887be66 CM |
5870 | delayed_refs->num_entries--; |
5871 | ||
5872 | /* | |
5873 | * we don't take a ref on the node because we're removing it from the | |
5874 | * tree, so we just steal the ref the tree was holding. | |
5875 | */ | |
c3e69d58 CM |
5876 | delayed_refs->num_heads--; |
5877 | if (list_empty(&head->cluster)) | |
5878 | delayed_refs->num_heads_ready--; | |
5879 | ||
5880 | list_del_init(&head->cluster); | |
1887be66 CM |
5881 | spin_unlock(&delayed_refs->lock); |
5882 | ||
f0486c68 YZ |
5883 | BUG_ON(head->extent_op); |
5884 | if (head->must_insert_reserved) | |
5885 | ret = 1; | |
5886 | ||
5887 | mutex_unlock(&head->mutex); | |
1887be66 | 5888 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 5889 | return ret; |
1887be66 CM |
5890 | out: |
5891 | spin_unlock(&delayed_refs->lock); | |
5892 | return 0; | |
5893 | } | |
5894 | ||
f0486c68 YZ |
5895 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
5896 | struct btrfs_root *root, | |
5897 | struct extent_buffer *buf, | |
5581a51a | 5898 | u64 parent, int last_ref) |
f0486c68 | 5899 | { |
f0486c68 | 5900 | struct btrfs_block_group_cache *cache = NULL; |
b150a4f1 | 5901 | int pin = 1; |
f0486c68 YZ |
5902 | int ret; |
5903 | ||
5904 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
5905 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
5906 | buf->start, buf->len, | |
5907 | parent, root->root_key.objectid, | |
5908 | btrfs_header_level(buf), | |
5581a51a | 5909 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 5910 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
5911 | } |
5912 | ||
5913 | if (!last_ref) | |
5914 | return; | |
5915 | ||
f0486c68 | 5916 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
5917 | |
5918 | if (btrfs_header_generation(buf) == trans->transid) { | |
5919 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5920 | ret = check_ref_cleanup(trans, root, buf->start); | |
5921 | if (!ret) | |
37be25bc | 5922 | goto out; |
f0486c68 YZ |
5923 | } |
5924 | ||
5925 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
5926 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 5927 | goto out; |
f0486c68 YZ |
5928 | } |
5929 | ||
5930 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
5931 | ||
5932 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 5933 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
b150a4f1 | 5934 | pin = 0; |
f0486c68 YZ |
5935 | } |
5936 | out: | |
b150a4f1 JB |
5937 | if (pin) |
5938 | add_pinned_bytes(root->fs_info, buf->len, | |
5939 | btrfs_header_level(buf), | |
5940 | root->root_key.objectid); | |
5941 | ||
a826d6dc JB |
5942 | /* |
5943 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
5944 | * anymore. | |
5945 | */ | |
5946 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
5947 | btrfs_put_block_group(cache); |
5948 | } | |
5949 | ||
79787eaa | 5950 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
5951 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5952 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
5953 | u64 owner, u64 offset, int for_cow) | |
925baedd CM |
5954 | { |
5955 | int ret; | |
66d7e7f0 | 5956 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 5957 | |
b150a4f1 JB |
5958 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
5959 | ||
56bec294 CM |
5960 | /* |
5961 | * tree log blocks never actually go into the extent allocation | |
5962 | * tree, just update pinning info and exit early. | |
56bec294 | 5963 | */ |
5d4f98a2 YZ |
5964 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
5965 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 5966 | /* unlocks the pinned mutex */ |
11833d66 | 5967 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 5968 | ret = 0; |
5d4f98a2 | 5969 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
5970 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
5971 | num_bytes, | |
5d4f98a2 | 5972 | parent, root_objectid, (int)owner, |
66d7e7f0 | 5973 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 5974 | } else { |
66d7e7f0 AJ |
5975 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
5976 | num_bytes, | |
5977 | parent, root_objectid, owner, | |
5978 | offset, BTRFS_DROP_DELAYED_REF, | |
5979 | NULL, for_cow); | |
56bec294 | 5980 | } |
925baedd CM |
5981 | return ret; |
5982 | } | |
5983 | ||
53b381b3 DW |
5984 | static u64 stripe_align(struct btrfs_root *root, |
5985 | struct btrfs_block_group_cache *cache, | |
5986 | u64 val, u64 num_bytes) | |
87ee04eb | 5987 | { |
fda2832f | 5988 | u64 ret = ALIGN(val, root->stripesize); |
87ee04eb CM |
5989 | return ret; |
5990 | } | |
5991 | ||
817d52f8 JB |
5992 | /* |
5993 | * when we wait for progress in the block group caching, its because | |
5994 | * our allocation attempt failed at least once. So, we must sleep | |
5995 | * and let some progress happen before we try again. | |
5996 | * | |
5997 | * This function will sleep at least once waiting for new free space to | |
5998 | * show up, and then it will check the block group free space numbers | |
5999 | * for our min num_bytes. Another option is to have it go ahead | |
6000 | * and look in the rbtree for a free extent of a given size, but this | |
6001 | * is a good start. | |
6002 | */ | |
6003 | static noinline int | |
6004 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
6005 | u64 num_bytes) | |
6006 | { | |
11833d66 | 6007 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 6008 | |
11833d66 YZ |
6009 | caching_ctl = get_caching_control(cache); |
6010 | if (!caching_ctl) | |
817d52f8 | 6011 | return 0; |
817d52f8 | 6012 | |
11833d66 | 6013 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 6014 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
6015 | |
6016 | put_caching_control(caching_ctl); | |
6017 | return 0; | |
6018 | } | |
6019 | ||
6020 | static noinline int | |
6021 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
6022 | { | |
6023 | struct btrfs_caching_control *caching_ctl; | |
11833d66 YZ |
6024 | |
6025 | caching_ctl = get_caching_control(cache); | |
6026 | if (!caching_ctl) | |
6027 | return 0; | |
6028 | ||
6029 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
6030 | ||
6031 | put_caching_control(caching_ctl); | |
817d52f8 JB |
6032 | return 0; |
6033 | } | |
6034 | ||
31e50229 | 6035 | int __get_raid_index(u64 flags) |
b742bb82 | 6036 | { |
7738a53a | 6037 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 6038 | return BTRFS_RAID_RAID10; |
7738a53a | 6039 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 6040 | return BTRFS_RAID_RAID1; |
7738a53a | 6041 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 6042 | return BTRFS_RAID_DUP; |
7738a53a | 6043 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 6044 | return BTRFS_RAID_RAID0; |
53b381b3 | 6045 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
e942f883 | 6046 | return BTRFS_RAID_RAID5; |
53b381b3 | 6047 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
e942f883 | 6048 | return BTRFS_RAID_RAID6; |
7738a53a | 6049 | |
e942f883 | 6050 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
b742bb82 YZ |
6051 | } |
6052 | ||
7738a53a ID |
6053 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
6054 | { | |
31e50229 | 6055 | return __get_raid_index(cache->flags); |
7738a53a ID |
6056 | } |
6057 | ||
817d52f8 | 6058 | enum btrfs_loop_type { |
285ff5af JB |
6059 | LOOP_CACHING_NOWAIT = 0, |
6060 | LOOP_CACHING_WAIT = 1, | |
6061 | LOOP_ALLOC_CHUNK = 2, | |
6062 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
6063 | }; |
6064 | ||
fec577fb CM |
6065 | /* |
6066 | * walks the btree of allocated extents and find a hole of a given size. | |
6067 | * The key ins is changed to record the hole: | |
6068 | * ins->objectid == block start | |
62e2749e | 6069 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
6070 | * ins->offset == number of blocks |
6071 | * Any available blocks before search_start are skipped. | |
6072 | */ | |
d397712b | 6073 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
6074 | struct btrfs_root *orig_root, |
6075 | u64 num_bytes, u64 empty_size, | |
98ed5174 | 6076 | u64 hint_byte, struct btrfs_key *ins, |
b6919a58 | 6077 | u64 flags) |
fec577fb | 6078 | { |
80eb234a | 6079 | int ret = 0; |
d397712b | 6080 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 6081 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 6082 | struct btrfs_block_group_cache *block_group = NULL; |
274bd4fb | 6083 | struct btrfs_block_group_cache *used_block_group; |
81c9ad23 | 6084 | u64 search_start = 0; |
239b14b3 | 6085 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 6086 | struct btrfs_space_info *space_info; |
fa9c0d79 | 6087 | int loop = 0; |
b6919a58 DS |
6088 | int index = __get_raid_index(flags); |
6089 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? | |
fb25e914 | 6090 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
817d52f8 | 6091 | bool found_uncached_bg = false; |
0a24325e | 6092 | bool failed_cluster_refill = false; |
1cdda9b8 | 6093 | bool failed_alloc = false; |
67377734 | 6094 | bool use_cluster = true; |
60d2adbb | 6095 | bool have_caching_bg = false; |
fec577fb | 6096 | |
db94535d | 6097 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 6098 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
6099 | ins->objectid = 0; |
6100 | ins->offset = 0; | |
b1a4d965 | 6101 | |
b6919a58 | 6102 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
3f7de037 | 6103 | |
b6919a58 | 6104 | space_info = __find_space_info(root->fs_info, flags); |
1b1d1f66 | 6105 | if (!space_info) { |
b6919a58 | 6106 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
1b1d1f66 JB |
6107 | return -ENOSPC; |
6108 | } | |
2552d17e | 6109 | |
67377734 JB |
6110 | /* |
6111 | * If the space info is for both data and metadata it means we have a | |
6112 | * small filesystem and we can't use the clustering stuff. | |
6113 | */ | |
6114 | if (btrfs_mixed_space_info(space_info)) | |
6115 | use_cluster = false; | |
6116 | ||
b6919a58 | 6117 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 6118 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
6119 | if (!btrfs_test_opt(root, SSD)) |
6120 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
6121 | } |
6122 | ||
b6919a58 | 6123 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
67377734 | 6124 | btrfs_test_opt(root, SSD)) { |
fa9c0d79 CM |
6125 | last_ptr = &root->fs_info->data_alloc_cluster; |
6126 | } | |
0f9dd46c | 6127 | |
239b14b3 | 6128 | if (last_ptr) { |
fa9c0d79 CM |
6129 | spin_lock(&last_ptr->lock); |
6130 | if (last_ptr->block_group) | |
6131 | hint_byte = last_ptr->window_start; | |
6132 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 6133 | } |
fa9c0d79 | 6134 | |
a061fc8d | 6135 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 6136 | search_start = max(search_start, hint_byte); |
0b86a832 | 6137 | |
817d52f8 | 6138 | if (!last_ptr) |
fa9c0d79 | 6139 | empty_cluster = 0; |
fa9c0d79 | 6140 | |
2552d17e | 6141 | if (search_start == hint_byte) { |
2552d17e JB |
6142 | block_group = btrfs_lookup_block_group(root->fs_info, |
6143 | search_start); | |
274bd4fb | 6144 | used_block_group = block_group; |
817d52f8 JB |
6145 | /* |
6146 | * we don't want to use the block group if it doesn't match our | |
6147 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
6148 | * |
6149 | * However if we are re-searching with an ideal block group | |
6150 | * picked out then we don't care that the block group is cached. | |
817d52f8 | 6151 | */ |
b6919a58 | 6152 | if (block_group && block_group_bits(block_group, flags) && |
285ff5af | 6153 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 6154 | down_read(&space_info->groups_sem); |
44fb5511 CM |
6155 | if (list_empty(&block_group->list) || |
6156 | block_group->ro) { | |
6157 | /* | |
6158 | * someone is removing this block group, | |
6159 | * we can't jump into the have_block_group | |
6160 | * target because our list pointers are not | |
6161 | * valid | |
6162 | */ | |
6163 | btrfs_put_block_group(block_group); | |
6164 | up_read(&space_info->groups_sem); | |
ccf0e725 | 6165 | } else { |
b742bb82 | 6166 | index = get_block_group_index(block_group); |
44fb5511 | 6167 | goto have_block_group; |
ccf0e725 | 6168 | } |
2552d17e | 6169 | } else if (block_group) { |
fa9c0d79 | 6170 | btrfs_put_block_group(block_group); |
2552d17e | 6171 | } |
42e70e7a | 6172 | } |
2552d17e | 6173 | search: |
60d2adbb | 6174 | have_caching_bg = false; |
80eb234a | 6175 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
6176 | list_for_each_entry(block_group, &space_info->block_groups[index], |
6177 | list) { | |
6226cb0a | 6178 | u64 offset; |
817d52f8 | 6179 | int cached; |
8a1413a2 | 6180 | |
274bd4fb | 6181 | used_block_group = block_group; |
11dfe35a | 6182 | btrfs_get_block_group(block_group); |
2552d17e | 6183 | search_start = block_group->key.objectid; |
42e70e7a | 6184 | |
83a50de9 CM |
6185 | /* |
6186 | * this can happen if we end up cycling through all the | |
6187 | * raid types, but we want to make sure we only allocate | |
6188 | * for the proper type. | |
6189 | */ | |
b6919a58 | 6190 | if (!block_group_bits(block_group, flags)) { |
83a50de9 CM |
6191 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
6192 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
6193 | BTRFS_BLOCK_GROUP_RAID5 | |
6194 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
6195 | BTRFS_BLOCK_GROUP_RAID10; |
6196 | ||
6197 | /* | |
6198 | * if they asked for extra copies and this block group | |
6199 | * doesn't provide them, bail. This does allow us to | |
6200 | * fill raid0 from raid1. | |
6201 | */ | |
b6919a58 | 6202 | if ((flags & extra) && !(block_group->flags & extra)) |
83a50de9 CM |
6203 | goto loop; |
6204 | } | |
6205 | ||
2552d17e | 6206 | have_block_group: |
291c7d2f JB |
6207 | cached = block_group_cache_done(block_group); |
6208 | if (unlikely(!cached)) { | |
291c7d2f | 6209 | found_uncached_bg = true; |
f6373bf3 | 6210 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
6211 | BUG_ON(ret < 0); |
6212 | ret = 0; | |
817d52f8 JB |
6213 | } |
6214 | ||
ea6a478e | 6215 | if (unlikely(block_group->ro)) |
2552d17e | 6216 | goto loop; |
0f9dd46c | 6217 | |
0a24325e | 6218 | /* |
062c05c4 AO |
6219 | * Ok we want to try and use the cluster allocator, so |
6220 | * lets look there | |
0a24325e | 6221 | */ |
062c05c4 | 6222 | if (last_ptr) { |
8de972b4 | 6223 | unsigned long aligned_cluster; |
fa9c0d79 CM |
6224 | /* |
6225 | * the refill lock keeps out other | |
6226 | * people trying to start a new cluster | |
6227 | */ | |
6228 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
6229 | used_block_group = last_ptr->block_group; |
6230 | if (used_block_group != block_group && | |
6231 | (!used_block_group || | |
6232 | used_block_group->ro || | |
b6919a58 | 6233 | !block_group_bits(used_block_group, flags))) { |
274bd4fb | 6234 | used_block_group = block_group; |
44fb5511 | 6235 | goto refill_cluster; |
274bd4fb AO |
6236 | } |
6237 | ||
6238 | if (used_block_group != block_group) | |
6239 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 6240 | |
274bd4fb AO |
6241 | offset = btrfs_alloc_from_cluster(used_block_group, |
6242 | last_ptr, num_bytes, used_block_group->key.objectid); | |
fa9c0d79 CM |
6243 | if (offset) { |
6244 | /* we have a block, we're done */ | |
6245 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6246 | trace_btrfs_reserve_extent_cluster(root, |
6247 | block_group, search_start, num_bytes); | |
fa9c0d79 CM |
6248 | goto checks; |
6249 | } | |
6250 | ||
274bd4fb AO |
6251 | WARN_ON(last_ptr->block_group != used_block_group); |
6252 | if (used_block_group != block_group) { | |
6253 | btrfs_put_block_group(used_block_group); | |
6254 | used_block_group = block_group; | |
fa9c0d79 | 6255 | } |
44fb5511 | 6256 | refill_cluster: |
274bd4fb | 6257 | BUG_ON(used_block_group != block_group); |
062c05c4 AO |
6258 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
6259 | * set up a new clusters, so lets just skip it | |
6260 | * and let the allocator find whatever block | |
6261 | * it can find. If we reach this point, we | |
6262 | * will have tried the cluster allocator | |
6263 | * plenty of times and not have found | |
6264 | * anything, so we are likely way too | |
6265 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
6266 | * anything. |
6267 | * | |
6268 | * However, if the cluster is taken from the | |
6269 | * current block group, release the cluster | |
6270 | * first, so that we stand a better chance of | |
6271 | * succeeding in the unclustered | |
6272 | * allocation. */ | |
6273 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
6274 | last_ptr->block_group != block_group) { | |
062c05c4 AO |
6275 | spin_unlock(&last_ptr->refill_lock); |
6276 | goto unclustered_alloc; | |
6277 | } | |
6278 | ||
fa9c0d79 CM |
6279 | /* |
6280 | * this cluster didn't work out, free it and | |
6281 | * start over | |
6282 | */ | |
6283 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
6284 | ||
a5f6f719 AO |
6285 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
6286 | spin_unlock(&last_ptr->refill_lock); | |
6287 | goto unclustered_alloc; | |
6288 | } | |
6289 | ||
8de972b4 CM |
6290 | aligned_cluster = max_t(unsigned long, |
6291 | empty_cluster + empty_size, | |
6292 | block_group->full_stripe_len); | |
6293 | ||
fa9c0d79 | 6294 | /* allocate a cluster in this block group */ |
451d7585 | 6295 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 | 6296 | block_group, last_ptr, |
1b22bad7 | 6297 | search_start, num_bytes, |
8de972b4 | 6298 | aligned_cluster); |
fa9c0d79 CM |
6299 | if (ret == 0) { |
6300 | /* | |
6301 | * now pull our allocation out of this | |
6302 | * cluster | |
6303 | */ | |
6304 | offset = btrfs_alloc_from_cluster(block_group, | |
6305 | last_ptr, num_bytes, | |
6306 | search_start); | |
6307 | if (offset) { | |
6308 | /* we found one, proceed */ | |
6309 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6310 | trace_btrfs_reserve_extent_cluster(root, |
6311 | block_group, search_start, | |
6312 | num_bytes); | |
fa9c0d79 CM |
6313 | goto checks; |
6314 | } | |
0a24325e JB |
6315 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
6316 | && !failed_cluster_refill) { | |
817d52f8 JB |
6317 | spin_unlock(&last_ptr->refill_lock); |
6318 | ||
0a24325e | 6319 | failed_cluster_refill = true; |
817d52f8 JB |
6320 | wait_block_group_cache_progress(block_group, |
6321 | num_bytes + empty_cluster + empty_size); | |
6322 | goto have_block_group; | |
fa9c0d79 | 6323 | } |
817d52f8 | 6324 | |
fa9c0d79 CM |
6325 | /* |
6326 | * at this point we either didn't find a cluster | |
6327 | * or we weren't able to allocate a block from our | |
6328 | * cluster. Free the cluster we've been trying | |
6329 | * to use, and go to the next block group | |
6330 | */ | |
0a24325e | 6331 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 6332 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 6333 | goto loop; |
fa9c0d79 CM |
6334 | } |
6335 | ||
062c05c4 | 6336 | unclustered_alloc: |
a5f6f719 AO |
6337 | spin_lock(&block_group->free_space_ctl->tree_lock); |
6338 | if (cached && | |
6339 | block_group->free_space_ctl->free_space < | |
6340 | num_bytes + empty_cluster + empty_size) { | |
6341 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6342 | goto loop; | |
6343 | } | |
6344 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6345 | ||
6226cb0a JB |
6346 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
6347 | num_bytes, empty_size); | |
1cdda9b8 JB |
6348 | /* |
6349 | * If we didn't find a chunk, and we haven't failed on this | |
6350 | * block group before, and this block group is in the middle of | |
6351 | * caching and we are ok with waiting, then go ahead and wait | |
6352 | * for progress to be made, and set failed_alloc to true. | |
6353 | * | |
6354 | * If failed_alloc is true then we've already waited on this | |
6355 | * block group once and should move on to the next block group. | |
6356 | */ | |
6357 | if (!offset && !failed_alloc && !cached && | |
6358 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 6359 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
6360 | num_bytes + empty_size); |
6361 | failed_alloc = true; | |
817d52f8 | 6362 | goto have_block_group; |
1cdda9b8 | 6363 | } else if (!offset) { |
60d2adbb MX |
6364 | if (!cached) |
6365 | have_caching_bg = true; | |
1cdda9b8 | 6366 | goto loop; |
817d52f8 | 6367 | } |
fa9c0d79 | 6368 | checks: |
53b381b3 DW |
6369 | search_start = stripe_align(root, used_block_group, |
6370 | offset, num_bytes); | |
25179201 | 6371 | |
2552d17e JB |
6372 | /* move on to the next group */ |
6373 | if (search_start + num_bytes > | |
274bd4fb AO |
6374 | used_block_group->key.objectid + used_block_group->key.offset) { |
6375 | btrfs_add_free_space(used_block_group, offset, num_bytes); | |
2552d17e | 6376 | goto loop; |
6226cb0a | 6377 | } |
f5a31e16 | 6378 | |
f0486c68 | 6379 | if (offset < search_start) |
274bd4fb | 6380 | btrfs_add_free_space(used_block_group, offset, |
f0486c68 YZ |
6381 | search_start - offset); |
6382 | BUG_ON(offset > search_start); | |
2552d17e | 6383 | |
274bd4fb | 6384 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
fb25e914 | 6385 | alloc_type); |
f0486c68 | 6386 | if (ret == -EAGAIN) { |
274bd4fb | 6387 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 6388 | goto loop; |
0f9dd46c | 6389 | } |
0b86a832 | 6390 | |
f0486c68 | 6391 | /* we are all good, lets return */ |
2552d17e JB |
6392 | ins->objectid = search_start; |
6393 | ins->offset = num_bytes; | |
d2fb3437 | 6394 | |
3f7de037 JB |
6395 | trace_btrfs_reserve_extent(orig_root, block_group, |
6396 | search_start, num_bytes); | |
274bd4fb AO |
6397 | if (used_block_group != block_group) |
6398 | btrfs_put_block_group(used_block_group); | |
d82a6f1d | 6399 | btrfs_put_block_group(block_group); |
2552d17e JB |
6400 | break; |
6401 | loop: | |
0a24325e | 6402 | failed_cluster_refill = false; |
1cdda9b8 | 6403 | failed_alloc = false; |
b742bb82 | 6404 | BUG_ON(index != get_block_group_index(block_group)); |
274bd4fb AO |
6405 | if (used_block_group != block_group) |
6406 | btrfs_put_block_group(used_block_group); | |
fa9c0d79 | 6407 | btrfs_put_block_group(block_group); |
2552d17e JB |
6408 | } |
6409 | up_read(&space_info->groups_sem); | |
6410 | ||
60d2adbb MX |
6411 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
6412 | goto search; | |
6413 | ||
b742bb82 YZ |
6414 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
6415 | goto search; | |
6416 | ||
285ff5af | 6417 | /* |
ccf0e725 JB |
6418 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
6419 | * caching kthreads as we move along | |
817d52f8 JB |
6420 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
6421 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
6422 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
6423 | * again | |
fa9c0d79 | 6424 | */ |
723bda20 | 6425 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 6426 | index = 0; |
723bda20 | 6427 | loop++; |
817d52f8 | 6428 | if (loop == LOOP_ALLOC_CHUNK) { |
b6919a58 | 6429 | ret = do_chunk_alloc(trans, root, flags, |
ea658bad JB |
6430 | CHUNK_ALLOC_FORCE); |
6431 | /* | |
6432 | * Do not bail out on ENOSPC since we | |
6433 | * can do more things. | |
6434 | */ | |
6435 | if (ret < 0 && ret != -ENOSPC) { | |
6436 | btrfs_abort_transaction(trans, | |
6437 | root, ret); | |
6438 | goto out; | |
723bda20 | 6439 | } |
2552d17e JB |
6440 | } |
6441 | ||
723bda20 JB |
6442 | if (loop == LOOP_NO_EMPTY_SIZE) { |
6443 | empty_size = 0; | |
6444 | empty_cluster = 0; | |
fa9c0d79 | 6445 | } |
723bda20 JB |
6446 | |
6447 | goto search; | |
2552d17e JB |
6448 | } else if (!ins->objectid) { |
6449 | ret = -ENOSPC; | |
d82a6f1d | 6450 | } else if (ins->objectid) { |
80eb234a | 6451 | ret = 0; |
be744175 | 6452 | } |
79787eaa | 6453 | out: |
be744175 | 6454 | |
0f70abe2 | 6455 | return ret; |
fec577fb | 6456 | } |
ec44a35c | 6457 | |
9ed74f2d JB |
6458 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
6459 | int dump_block_groups) | |
0f9dd46c JB |
6460 | { |
6461 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 6462 | int index = 0; |
0f9dd46c | 6463 | |
9ed74f2d | 6464 | spin_lock(&info->lock); |
fb25e914 JB |
6465 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
6466 | (unsigned long long)info->flags, | |
d397712b | 6467 | (unsigned long long)(info->total_bytes - info->bytes_used - |
9ed74f2d | 6468 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 6469 | info->bytes_readonly), |
d397712b | 6470 | (info->full) ? "" : "not "); |
8929ecfa YZ |
6471 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
6472 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 6473 | (unsigned long long)info->total_bytes, |
8929ecfa | 6474 | (unsigned long long)info->bytes_used, |
21380931 | 6475 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 6476 | (unsigned long long)info->bytes_reserved, |
21380931 | 6477 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 6478 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
6479 | spin_unlock(&info->lock); |
6480 | ||
6481 | if (!dump_block_groups) | |
6482 | return; | |
0f9dd46c | 6483 | |
80eb234a | 6484 | down_read(&info->groups_sem); |
b742bb82 YZ |
6485 | again: |
6486 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 6487 | spin_lock(&cache->lock); |
799ffc3c | 6488 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s\n", |
d397712b CM |
6489 | (unsigned long long)cache->key.objectid, |
6490 | (unsigned long long)cache->key.offset, | |
6491 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
6492 | (unsigned long long)cache->pinned, | |
799ffc3c LB |
6493 | (unsigned long long)cache->reserved, |
6494 | cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
6495 | btrfs_dump_free_space(cache, bytes); |
6496 | spin_unlock(&cache->lock); | |
6497 | } | |
b742bb82 YZ |
6498 | if (++index < BTRFS_NR_RAID_TYPES) |
6499 | goto again; | |
80eb234a | 6500 | up_read(&info->groups_sem); |
0f9dd46c | 6501 | } |
e8569813 | 6502 | |
11833d66 YZ |
6503 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
6504 | struct btrfs_root *root, | |
6505 | u64 num_bytes, u64 min_alloc_size, | |
6506 | u64 empty_size, u64 hint_byte, | |
b6919a58 | 6507 | struct btrfs_key *ins, int is_data) |
fec577fb | 6508 | { |
9e622d6b | 6509 | bool final_tried = false; |
b6919a58 | 6510 | u64 flags; |
fec577fb | 6511 | int ret; |
925baedd | 6512 | |
b6919a58 | 6513 | flags = btrfs_get_alloc_profile(root, is_data); |
98d20f67 | 6514 | again: |
db94535d CM |
6515 | WARN_ON(num_bytes < root->sectorsize); |
6516 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
b6919a58 | 6517 | hint_byte, ins, flags); |
3b951516 | 6518 | |
9e622d6b MX |
6519 | if (ret == -ENOSPC) { |
6520 | if (!final_tried) { | |
6521 | num_bytes = num_bytes >> 1; | |
24542bf7 | 6522 | num_bytes = round_down(num_bytes, root->sectorsize); |
9e622d6b | 6523 | num_bytes = max(num_bytes, min_alloc_size); |
9e622d6b MX |
6524 | if (num_bytes == min_alloc_size) |
6525 | final_tried = true; | |
6526 | goto again; | |
6527 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
6528 | struct btrfs_space_info *sinfo; | |
6529 | ||
b6919a58 | 6530 | sinfo = __find_space_info(root->fs_info, flags); |
c2cf52eb | 6531 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
b6919a58 | 6532 | (unsigned long long)flags, |
c2cf52eb | 6533 | (unsigned long long)num_bytes); |
53804280 JM |
6534 | if (sinfo) |
6535 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 6536 | } |
925baedd | 6537 | } |
0f9dd46c | 6538 | |
1abe9b8a | 6539 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
6540 | ||
0f9dd46c | 6541 | return ret; |
e6dcd2dc CM |
6542 | } |
6543 | ||
e688b725 CM |
6544 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
6545 | u64 start, u64 len, int pin) | |
65b51a00 | 6546 | { |
0f9dd46c | 6547 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 6548 | int ret = 0; |
0f9dd46c | 6549 | |
0f9dd46c JB |
6550 | cache = btrfs_lookup_block_group(root->fs_info, start); |
6551 | if (!cache) { | |
c2cf52eb SK |
6552 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
6553 | (unsigned long long)start); | |
0f9dd46c JB |
6554 | return -ENOSPC; |
6555 | } | |
1f3c79a2 | 6556 | |
5378e607 LD |
6557 | if (btrfs_test_opt(root, DISCARD)) |
6558 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 6559 | |
e688b725 CM |
6560 | if (pin) |
6561 | pin_down_extent(root, cache, start, len, 1); | |
6562 | else { | |
6563 | btrfs_add_free_space(cache, start, len); | |
6564 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
6565 | } | |
fa9c0d79 | 6566 | btrfs_put_block_group(cache); |
817d52f8 | 6567 | |
1abe9b8a | 6568 | trace_btrfs_reserved_extent_free(root, start, len); |
6569 | ||
e6dcd2dc CM |
6570 | return ret; |
6571 | } | |
6572 | ||
e688b725 CM |
6573 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
6574 | u64 start, u64 len) | |
6575 | { | |
6576 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
6577 | } | |
6578 | ||
6579 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
6580 | u64 start, u64 len) | |
6581 | { | |
6582 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
6583 | } | |
6584 | ||
5d4f98a2 YZ |
6585 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
6586 | struct btrfs_root *root, | |
6587 | u64 parent, u64 root_objectid, | |
6588 | u64 flags, u64 owner, u64 offset, | |
6589 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
6590 | { |
6591 | int ret; | |
5d4f98a2 | 6592 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 6593 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 6594 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 6595 | struct btrfs_path *path; |
5d4f98a2 YZ |
6596 | struct extent_buffer *leaf; |
6597 | int type; | |
6598 | u32 size; | |
26b8003f | 6599 | |
5d4f98a2 YZ |
6600 | if (parent > 0) |
6601 | type = BTRFS_SHARED_DATA_REF_KEY; | |
6602 | else | |
6603 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 6604 | |
5d4f98a2 | 6605 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
6606 | |
6607 | path = btrfs_alloc_path(); | |
db5b493a TI |
6608 | if (!path) |
6609 | return -ENOMEM; | |
47e4bb98 | 6610 | |
b9473439 | 6611 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6612 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
6613 | ins, size); | |
79787eaa JM |
6614 | if (ret) { |
6615 | btrfs_free_path(path); | |
6616 | return ret; | |
6617 | } | |
0f9dd46c | 6618 | |
5d4f98a2 YZ |
6619 | leaf = path->nodes[0]; |
6620 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 6621 | struct btrfs_extent_item); |
5d4f98a2 YZ |
6622 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
6623 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6624 | btrfs_set_extent_flags(leaf, extent_item, | |
6625 | flags | BTRFS_EXTENT_FLAG_DATA); | |
6626 | ||
6627 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6628 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
6629 | if (parent > 0) { | |
6630 | struct btrfs_shared_data_ref *ref; | |
6631 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
6632 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6633 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
6634 | } else { | |
6635 | struct btrfs_extent_data_ref *ref; | |
6636 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
6637 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
6638 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
6639 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
6640 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
6641 | } | |
47e4bb98 CM |
6642 | |
6643 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 6644 | btrfs_free_path(path); |
f510cfec | 6645 | |
c53d613e | 6646 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6647 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb SK |
6648 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
6649 | (unsigned long long)ins->objectid, | |
6650 | (unsigned long long)ins->offset); | |
f5947066 CM |
6651 | BUG(); |
6652 | } | |
e6dcd2dc CM |
6653 | return ret; |
6654 | } | |
6655 | ||
5d4f98a2 YZ |
6656 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
6657 | struct btrfs_root *root, | |
6658 | u64 parent, u64 root_objectid, | |
6659 | u64 flags, struct btrfs_disk_key *key, | |
6660 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
6661 | { |
6662 | int ret; | |
5d4f98a2 YZ |
6663 | struct btrfs_fs_info *fs_info = root->fs_info; |
6664 | struct btrfs_extent_item *extent_item; | |
6665 | struct btrfs_tree_block_info *block_info; | |
6666 | struct btrfs_extent_inline_ref *iref; | |
6667 | struct btrfs_path *path; | |
6668 | struct extent_buffer *leaf; | |
3173a18f JB |
6669 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
6670 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
6671 | SKINNY_METADATA); | |
6672 | ||
6673 | if (!skinny_metadata) | |
6674 | size += sizeof(*block_info); | |
1c2308f8 | 6675 | |
5d4f98a2 | 6676 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6677 | if (!path) |
6678 | return -ENOMEM; | |
56bec294 | 6679 | |
5d4f98a2 YZ |
6680 | path->leave_spinning = 1; |
6681 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
6682 | ins, size); | |
79787eaa JM |
6683 | if (ret) { |
6684 | btrfs_free_path(path); | |
6685 | return ret; | |
6686 | } | |
5d4f98a2 YZ |
6687 | |
6688 | leaf = path->nodes[0]; | |
6689 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
6690 | struct btrfs_extent_item); | |
6691 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
6692 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6693 | btrfs_set_extent_flags(leaf, extent_item, | |
6694 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 6695 | |
3173a18f JB |
6696 | if (skinny_metadata) { |
6697 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6698 | } else { | |
6699 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
6700 | btrfs_set_tree_block_key(leaf, block_info, key); | |
6701 | btrfs_set_tree_block_level(leaf, block_info, level); | |
6702 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
6703 | } | |
5d4f98a2 | 6704 | |
5d4f98a2 YZ |
6705 | if (parent > 0) { |
6706 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
6707 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6708 | BTRFS_SHARED_BLOCK_REF_KEY); | |
6709 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6710 | } else { | |
6711 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6712 | BTRFS_TREE_BLOCK_REF_KEY); | |
6713 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
6714 | } | |
6715 | ||
6716 | btrfs_mark_buffer_dirty(leaf); | |
6717 | btrfs_free_path(path); | |
6718 | ||
3173a18f | 6719 | ret = update_block_group(root, ins->objectid, root->leafsize, 1); |
79787eaa | 6720 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb SK |
6721 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
6722 | (unsigned long long)ins->objectid, | |
6723 | (unsigned long long)ins->offset); | |
5d4f98a2 YZ |
6724 | BUG(); |
6725 | } | |
6726 | return ret; | |
6727 | } | |
6728 | ||
6729 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
6730 | struct btrfs_root *root, | |
6731 | u64 root_objectid, u64 owner, | |
6732 | u64 offset, struct btrfs_key *ins) | |
6733 | { | |
6734 | int ret; | |
6735 | ||
6736 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
6737 | ||
66d7e7f0 AJ |
6738 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
6739 | ins->offset, 0, | |
6740 | root_objectid, owner, offset, | |
6741 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
6742 | return ret; |
6743 | } | |
e02119d5 CM |
6744 | |
6745 | /* | |
6746 | * this is used by the tree logging recovery code. It records that | |
6747 | * an extent has been allocated and makes sure to clear the free | |
6748 | * space cache bits as well | |
6749 | */ | |
5d4f98a2 YZ |
6750 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
6751 | struct btrfs_root *root, | |
6752 | u64 root_objectid, u64 owner, u64 offset, | |
6753 | struct btrfs_key *ins) | |
e02119d5 CM |
6754 | { |
6755 | int ret; | |
6756 | struct btrfs_block_group_cache *block_group; | |
11833d66 | 6757 | |
8c2a1a30 JB |
6758 | /* |
6759 | * Mixed block groups will exclude before processing the log so we only | |
6760 | * need to do the exlude dance if this fs isn't mixed. | |
6761 | */ | |
6762 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { | |
6763 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); | |
b50c6e25 | 6764 | if (ret) |
8c2a1a30 | 6765 | return ret; |
11833d66 YZ |
6766 | } |
6767 | ||
8c2a1a30 JB |
6768 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
6769 | if (!block_group) | |
6770 | return -EINVAL; | |
6771 | ||
fb25e914 JB |
6772 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
6773 | RESERVE_ALLOC_NO_ACCOUNT); | |
79787eaa | 6774 | BUG_ON(ret); /* logic error */ |
5d4f98a2 YZ |
6775 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
6776 | 0, owner, offset, ins, 1); | |
b50c6e25 | 6777 | btrfs_put_block_group(block_group); |
e02119d5 CM |
6778 | return ret; |
6779 | } | |
6780 | ||
48a3b636 ES |
6781 | static struct extent_buffer * |
6782 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
6783 | u64 bytenr, u32 blocksize, int level) | |
65b51a00 CM |
6784 | { |
6785 | struct extent_buffer *buf; | |
6786 | ||
6787 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
6788 | if (!buf) | |
6789 | return ERR_PTR(-ENOMEM); | |
6790 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 6791 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
6792 | btrfs_tree_lock(buf); |
6793 | clean_tree_block(trans, root, buf); | |
3083ee2e | 6794 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
6795 | |
6796 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 6797 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 6798 | |
d0c803c4 | 6799 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
6800 | /* |
6801 | * we allow two log transactions at a time, use different | |
6802 | * EXENT bit to differentiate dirty pages. | |
6803 | */ | |
6804 | if (root->log_transid % 2 == 0) | |
6805 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
6806 | buf->start + buf->len - 1, GFP_NOFS); | |
6807 | else | |
6808 | set_extent_new(&root->dirty_log_pages, buf->start, | |
6809 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
6810 | } else { |
6811 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 6812 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 6813 | } |
65b51a00 | 6814 | trans->blocks_used++; |
b4ce94de | 6815 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
6816 | return buf; |
6817 | } | |
6818 | ||
f0486c68 YZ |
6819 | static struct btrfs_block_rsv * |
6820 | use_block_rsv(struct btrfs_trans_handle *trans, | |
6821 | struct btrfs_root *root, u32 blocksize) | |
6822 | { | |
6823 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 6824 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 | 6825 | int ret; |
d88033db | 6826 | bool global_updated = false; |
f0486c68 YZ |
6827 | |
6828 | block_rsv = get_block_rsv(trans, root); | |
6829 | ||
b586b323 MX |
6830 | if (unlikely(block_rsv->size == 0)) |
6831 | goto try_reserve; | |
d88033db | 6832 | again: |
f0486c68 YZ |
6833 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
6834 | if (!ret) | |
6835 | return block_rsv; | |
6836 | ||
b586b323 MX |
6837 | if (block_rsv->failfast) |
6838 | return ERR_PTR(ret); | |
6839 | ||
d88033db MX |
6840 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
6841 | global_updated = true; | |
6842 | update_global_block_rsv(root->fs_info); | |
6843 | goto again; | |
6844 | } | |
6845 | ||
b586b323 MX |
6846 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
6847 | static DEFINE_RATELIMIT_STATE(_rs, | |
6848 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
6849 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
6850 | if (__ratelimit(&_rs)) | |
6851 | WARN(1, KERN_DEBUG | |
6852 | "btrfs: block rsv returned %d\n", ret); | |
6853 | } | |
6854 | try_reserve: | |
6855 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
6856 | BTRFS_RESERVE_NO_FLUSH); | |
6857 | if (!ret) | |
6858 | return block_rsv; | |
6859 | /* | |
6860 | * If we couldn't reserve metadata bytes try and use some from | |
5881cfc9 MX |
6861 | * the global reserve if its space type is the same as the global |
6862 | * reservation. | |
b586b323 | 6863 | */ |
5881cfc9 MX |
6864 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
6865 | block_rsv->space_info == global_rsv->space_info) { | |
b586b323 MX |
6866 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
6867 | if (!ret) | |
6868 | return global_rsv; | |
6869 | } | |
6870 | return ERR_PTR(ret); | |
f0486c68 YZ |
6871 | } |
6872 | ||
8c2a3ca2 JB |
6873 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
6874 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
6875 | { |
6876 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 6877 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
6878 | } |
6879 | ||
fec577fb | 6880 | /* |
f0486c68 YZ |
6881 | * finds a free extent and does all the dirty work required for allocation |
6882 | * returns the key for the extent through ins, and a tree buffer for | |
6883 | * the first block of the extent through buf. | |
6884 | * | |
fec577fb CM |
6885 | * returns the tree buffer or NULL. |
6886 | */ | |
5f39d397 | 6887 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6888 | struct btrfs_root *root, u32 blocksize, |
6889 | u64 parent, u64 root_objectid, | |
6890 | struct btrfs_disk_key *key, int level, | |
5581a51a | 6891 | u64 hint, u64 empty_size) |
fec577fb | 6892 | { |
e2fa7227 | 6893 | struct btrfs_key ins; |
f0486c68 | 6894 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6895 | struct extent_buffer *buf; |
f0486c68 YZ |
6896 | u64 flags = 0; |
6897 | int ret; | |
3173a18f JB |
6898 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
6899 | SKINNY_METADATA); | |
fec577fb | 6900 | |
f0486c68 YZ |
6901 | block_rsv = use_block_rsv(trans, root, blocksize); |
6902 | if (IS_ERR(block_rsv)) | |
6903 | return ERR_CAST(block_rsv); | |
6904 | ||
6905 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
81c9ad23 | 6906 | empty_size, hint, &ins, 0); |
fec577fb | 6907 | if (ret) { |
8c2a3ca2 | 6908 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
54aa1f4d | 6909 | return ERR_PTR(ret); |
fec577fb | 6910 | } |
55c69072 | 6911 | |
4008c04a CM |
6912 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
6913 | blocksize, level); | |
79787eaa | 6914 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
f0486c68 YZ |
6915 | |
6916 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
6917 | if (parent == 0) | |
6918 | parent = ins.objectid; | |
6919 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6920 | } else | |
6921 | BUG_ON(parent > 0); | |
6922 | ||
6923 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6924 | struct btrfs_delayed_extent_op *extent_op; | |
78a6184a | 6925 | extent_op = btrfs_alloc_delayed_extent_op(); |
79787eaa | 6926 | BUG_ON(!extent_op); /* -ENOMEM */ |
f0486c68 YZ |
6927 | if (key) |
6928 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
6929 | else | |
6930 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
6931 | extent_op->flags_to_set = flags; | |
3173a18f JB |
6932 | if (skinny_metadata) |
6933 | extent_op->update_key = 0; | |
6934 | else | |
6935 | extent_op->update_key = 1; | |
f0486c68 YZ |
6936 | extent_op->update_flags = 1; |
6937 | extent_op->is_data = 0; | |
b1c79e09 | 6938 | extent_op->level = level; |
f0486c68 | 6939 | |
66d7e7f0 AJ |
6940 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
6941 | ins.objectid, | |
f0486c68 YZ |
6942 | ins.offset, parent, root_objectid, |
6943 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5581a51a | 6944 | extent_op, 0); |
79787eaa | 6945 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 | 6946 | } |
fec577fb CM |
6947 | return buf; |
6948 | } | |
a28ec197 | 6949 | |
2c47e605 YZ |
6950 | struct walk_control { |
6951 | u64 refs[BTRFS_MAX_LEVEL]; | |
6952 | u64 flags[BTRFS_MAX_LEVEL]; | |
6953 | struct btrfs_key update_progress; | |
6954 | int stage; | |
6955 | int level; | |
6956 | int shared_level; | |
6957 | int update_ref; | |
6958 | int keep_locks; | |
1c4850e2 YZ |
6959 | int reada_slot; |
6960 | int reada_count; | |
66d7e7f0 | 6961 | int for_reloc; |
2c47e605 YZ |
6962 | }; |
6963 | ||
6964 | #define DROP_REFERENCE 1 | |
6965 | #define UPDATE_BACKREF 2 | |
6966 | ||
1c4850e2 YZ |
6967 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
6968 | struct btrfs_root *root, | |
6969 | struct walk_control *wc, | |
6970 | struct btrfs_path *path) | |
6407bf6d | 6971 | { |
1c4850e2 YZ |
6972 | u64 bytenr; |
6973 | u64 generation; | |
6974 | u64 refs; | |
94fcca9f | 6975 | u64 flags; |
5d4f98a2 | 6976 | u32 nritems; |
1c4850e2 YZ |
6977 | u32 blocksize; |
6978 | struct btrfs_key key; | |
6979 | struct extent_buffer *eb; | |
6407bf6d | 6980 | int ret; |
1c4850e2 YZ |
6981 | int slot; |
6982 | int nread = 0; | |
6407bf6d | 6983 | |
1c4850e2 YZ |
6984 | if (path->slots[wc->level] < wc->reada_slot) { |
6985 | wc->reada_count = wc->reada_count * 2 / 3; | |
6986 | wc->reada_count = max(wc->reada_count, 2); | |
6987 | } else { | |
6988 | wc->reada_count = wc->reada_count * 3 / 2; | |
6989 | wc->reada_count = min_t(int, wc->reada_count, | |
6990 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
6991 | } | |
7bb86316 | 6992 | |
1c4850e2 YZ |
6993 | eb = path->nodes[wc->level]; |
6994 | nritems = btrfs_header_nritems(eb); | |
6995 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 6996 | |
1c4850e2 YZ |
6997 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
6998 | if (nread >= wc->reada_count) | |
6999 | break; | |
bd56b302 | 7000 | |
2dd3e67b | 7001 | cond_resched(); |
1c4850e2 YZ |
7002 | bytenr = btrfs_node_blockptr(eb, slot); |
7003 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 7004 | |
1c4850e2 YZ |
7005 | if (slot == path->slots[wc->level]) |
7006 | goto reada; | |
5d4f98a2 | 7007 | |
1c4850e2 YZ |
7008 | if (wc->stage == UPDATE_BACKREF && |
7009 | generation <= root->root_key.offset) | |
bd56b302 CM |
7010 | continue; |
7011 | ||
94fcca9f | 7012 | /* We don't lock the tree block, it's OK to be racy here */ |
3173a18f JB |
7013 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
7014 | wc->level - 1, 1, &refs, | |
7015 | &flags); | |
79787eaa JM |
7016 | /* We don't care about errors in readahead. */ |
7017 | if (ret < 0) | |
7018 | continue; | |
94fcca9f YZ |
7019 | BUG_ON(refs == 0); |
7020 | ||
1c4850e2 | 7021 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
7022 | if (refs == 1) |
7023 | goto reada; | |
bd56b302 | 7024 | |
94fcca9f YZ |
7025 | if (wc->level == 1 && |
7026 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7027 | continue; | |
1c4850e2 YZ |
7028 | if (!wc->update_ref || |
7029 | generation <= root->root_key.offset) | |
7030 | continue; | |
7031 | btrfs_node_key_to_cpu(eb, &key, slot); | |
7032 | ret = btrfs_comp_cpu_keys(&key, | |
7033 | &wc->update_progress); | |
7034 | if (ret < 0) | |
7035 | continue; | |
94fcca9f YZ |
7036 | } else { |
7037 | if (wc->level == 1 && | |
7038 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7039 | continue; | |
6407bf6d | 7040 | } |
1c4850e2 YZ |
7041 | reada: |
7042 | ret = readahead_tree_block(root, bytenr, blocksize, | |
7043 | generation); | |
7044 | if (ret) | |
bd56b302 | 7045 | break; |
1c4850e2 | 7046 | nread++; |
20524f02 | 7047 | } |
1c4850e2 | 7048 | wc->reada_slot = slot; |
20524f02 | 7049 | } |
2c47e605 | 7050 | |
f82d02d9 | 7051 | /* |
2c016dc2 | 7052 | * helper to process tree block while walking down the tree. |
2c47e605 | 7053 | * |
2c47e605 YZ |
7054 | * when wc->stage == UPDATE_BACKREF, this function updates |
7055 | * back refs for pointers in the block. | |
7056 | * | |
7057 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 7058 | */ |
2c47e605 | 7059 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 7060 | struct btrfs_root *root, |
2c47e605 | 7061 | struct btrfs_path *path, |
94fcca9f | 7062 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 7063 | { |
2c47e605 YZ |
7064 | int level = wc->level; |
7065 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 7066 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
7067 | int ret; |
7068 | ||
2c47e605 YZ |
7069 | if (wc->stage == UPDATE_BACKREF && |
7070 | btrfs_header_owner(eb) != root->root_key.objectid) | |
7071 | return 1; | |
f82d02d9 | 7072 | |
2c47e605 YZ |
7073 | /* |
7074 | * when reference count of tree block is 1, it won't increase | |
7075 | * again. once full backref flag is set, we never clear it. | |
7076 | */ | |
94fcca9f YZ |
7077 | if (lookup_info && |
7078 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
7079 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
7080 | BUG_ON(!path->locks[level]); |
7081 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7082 | eb->start, level, 1, |
2c47e605 YZ |
7083 | &wc->refs[level], |
7084 | &wc->flags[level]); | |
79787eaa JM |
7085 | BUG_ON(ret == -ENOMEM); |
7086 | if (ret) | |
7087 | return ret; | |
2c47e605 YZ |
7088 | BUG_ON(wc->refs[level] == 0); |
7089 | } | |
5d4f98a2 | 7090 | |
2c47e605 YZ |
7091 | if (wc->stage == DROP_REFERENCE) { |
7092 | if (wc->refs[level] > 1) | |
7093 | return 1; | |
f82d02d9 | 7094 | |
2c47e605 | 7095 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 7096 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7097 | path->locks[level] = 0; |
7098 | } | |
7099 | return 0; | |
7100 | } | |
f82d02d9 | 7101 | |
2c47e605 YZ |
7102 | /* wc->stage == UPDATE_BACKREF */ |
7103 | if (!(wc->flags[level] & flag)) { | |
7104 | BUG_ON(!path->locks[level]); | |
66d7e7f0 | 7105 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
79787eaa | 7106 | BUG_ON(ret); /* -ENOMEM */ |
66d7e7f0 | 7107 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
79787eaa | 7108 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 | 7109 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
b1c79e09 JB |
7110 | eb->len, flag, |
7111 | btrfs_header_level(eb), 0); | |
79787eaa | 7112 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7113 | wc->flags[level] |= flag; |
7114 | } | |
7115 | ||
7116 | /* | |
7117 | * the block is shared by multiple trees, so it's not good to | |
7118 | * keep the tree lock | |
7119 | */ | |
7120 | if (path->locks[level] && level > 0) { | |
bd681513 | 7121 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7122 | path->locks[level] = 0; |
7123 | } | |
7124 | return 0; | |
7125 | } | |
7126 | ||
1c4850e2 | 7127 | /* |
2c016dc2 | 7128 | * helper to process tree block pointer. |
1c4850e2 YZ |
7129 | * |
7130 | * when wc->stage == DROP_REFERENCE, this function checks | |
7131 | * reference count of the block pointed to. if the block | |
7132 | * is shared and we need update back refs for the subtree | |
7133 | * rooted at the block, this function changes wc->stage to | |
7134 | * UPDATE_BACKREF. if the block is shared and there is no | |
7135 | * need to update back, this function drops the reference | |
7136 | * to the block. | |
7137 | * | |
7138 | * NOTE: return value 1 means we should stop walking down. | |
7139 | */ | |
7140 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
7141 | struct btrfs_root *root, | |
7142 | struct btrfs_path *path, | |
94fcca9f | 7143 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
7144 | { |
7145 | u64 bytenr; | |
7146 | u64 generation; | |
7147 | u64 parent; | |
7148 | u32 blocksize; | |
7149 | struct btrfs_key key; | |
7150 | struct extent_buffer *next; | |
7151 | int level = wc->level; | |
7152 | int reada = 0; | |
7153 | int ret = 0; | |
7154 | ||
7155 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
7156 | path->slots[level]); | |
7157 | /* | |
7158 | * if the lower level block was created before the snapshot | |
7159 | * was created, we know there is no need to update back refs | |
7160 | * for the subtree | |
7161 | */ | |
7162 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
7163 | generation <= root->root_key.offset) { |
7164 | *lookup_info = 1; | |
1c4850e2 | 7165 | return 1; |
94fcca9f | 7166 | } |
1c4850e2 YZ |
7167 | |
7168 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
7169 | blocksize = btrfs_level_size(root, level - 1); | |
7170 | ||
7171 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
7172 | if (!next) { | |
7173 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
7174 | if (!next) |
7175 | return -ENOMEM; | |
1c4850e2 YZ |
7176 | reada = 1; |
7177 | } | |
7178 | btrfs_tree_lock(next); | |
7179 | btrfs_set_lock_blocking(next); | |
7180 | ||
3173a18f | 7181 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
94fcca9f YZ |
7182 | &wc->refs[level - 1], |
7183 | &wc->flags[level - 1]); | |
79787eaa JM |
7184 | if (ret < 0) { |
7185 | btrfs_tree_unlock(next); | |
7186 | return ret; | |
7187 | } | |
7188 | ||
c2cf52eb SK |
7189 | if (unlikely(wc->refs[level - 1] == 0)) { |
7190 | btrfs_err(root->fs_info, "Missing references."); | |
7191 | BUG(); | |
7192 | } | |
94fcca9f | 7193 | *lookup_info = 0; |
1c4850e2 | 7194 | |
94fcca9f | 7195 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 7196 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
7197 | if (level == 1 && |
7198 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7199 | goto skip; | |
7200 | ||
1c4850e2 YZ |
7201 | if (!wc->update_ref || |
7202 | generation <= root->root_key.offset) | |
7203 | goto skip; | |
7204 | ||
7205 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
7206 | path->slots[level]); | |
7207 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
7208 | if (ret < 0) | |
7209 | goto skip; | |
7210 | ||
7211 | wc->stage = UPDATE_BACKREF; | |
7212 | wc->shared_level = level - 1; | |
7213 | } | |
94fcca9f YZ |
7214 | } else { |
7215 | if (level == 1 && | |
7216 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7217 | goto skip; | |
1c4850e2 YZ |
7218 | } |
7219 | ||
b9fab919 | 7220 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
7221 | btrfs_tree_unlock(next); |
7222 | free_extent_buffer(next); | |
7223 | next = NULL; | |
94fcca9f | 7224 | *lookup_info = 1; |
1c4850e2 YZ |
7225 | } |
7226 | ||
7227 | if (!next) { | |
7228 | if (reada && level == 1) | |
7229 | reada_walk_down(trans, root, wc, path); | |
7230 | next = read_tree_block(root, bytenr, blocksize, generation); | |
416bc658 JB |
7231 | if (!next || !extent_buffer_uptodate(next)) { |
7232 | free_extent_buffer(next); | |
97d9a8a4 | 7233 | return -EIO; |
416bc658 | 7234 | } |
1c4850e2 YZ |
7235 | btrfs_tree_lock(next); |
7236 | btrfs_set_lock_blocking(next); | |
7237 | } | |
7238 | ||
7239 | level--; | |
7240 | BUG_ON(level != btrfs_header_level(next)); | |
7241 | path->nodes[level] = next; | |
7242 | path->slots[level] = 0; | |
bd681513 | 7243 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
7244 | wc->level = level; |
7245 | if (wc->level == 1) | |
7246 | wc->reada_slot = 0; | |
7247 | return 0; | |
7248 | skip: | |
7249 | wc->refs[level - 1] = 0; | |
7250 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
7251 | if (wc->stage == DROP_REFERENCE) { |
7252 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
7253 | parent = path->nodes[level]->start; | |
7254 | } else { | |
7255 | BUG_ON(root->root_key.objectid != | |
7256 | btrfs_header_owner(path->nodes[level])); | |
7257 | parent = 0; | |
7258 | } | |
1c4850e2 | 7259 | |
94fcca9f | 7260 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 7261 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 7262 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 7263 | } |
1c4850e2 YZ |
7264 | btrfs_tree_unlock(next); |
7265 | free_extent_buffer(next); | |
94fcca9f | 7266 | *lookup_info = 1; |
1c4850e2 YZ |
7267 | return 1; |
7268 | } | |
7269 | ||
2c47e605 | 7270 | /* |
2c016dc2 | 7271 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
7272 | * |
7273 | * when wc->stage == DROP_REFERENCE, this function drops | |
7274 | * reference count on the block. | |
7275 | * | |
7276 | * when wc->stage == UPDATE_BACKREF, this function changes | |
7277 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
7278 | * to UPDATE_BACKREF previously while processing the block. | |
7279 | * | |
7280 | * NOTE: return value 1 means we should stop walking up. | |
7281 | */ | |
7282 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
7283 | struct btrfs_root *root, | |
7284 | struct btrfs_path *path, | |
7285 | struct walk_control *wc) | |
7286 | { | |
f0486c68 | 7287 | int ret; |
2c47e605 YZ |
7288 | int level = wc->level; |
7289 | struct extent_buffer *eb = path->nodes[level]; | |
7290 | u64 parent = 0; | |
7291 | ||
7292 | if (wc->stage == UPDATE_BACKREF) { | |
7293 | BUG_ON(wc->shared_level < level); | |
7294 | if (level < wc->shared_level) | |
7295 | goto out; | |
7296 | ||
2c47e605 YZ |
7297 | ret = find_next_key(path, level + 1, &wc->update_progress); |
7298 | if (ret > 0) | |
7299 | wc->update_ref = 0; | |
7300 | ||
7301 | wc->stage = DROP_REFERENCE; | |
7302 | wc->shared_level = -1; | |
7303 | path->slots[level] = 0; | |
7304 | ||
7305 | /* | |
7306 | * check reference count again if the block isn't locked. | |
7307 | * we should start walking down the tree again if reference | |
7308 | * count is one. | |
7309 | */ | |
7310 | if (!path->locks[level]) { | |
7311 | BUG_ON(level == 0); | |
7312 | btrfs_tree_lock(eb); | |
7313 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7314 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7315 | |
7316 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7317 | eb->start, level, 1, |
2c47e605 YZ |
7318 | &wc->refs[level], |
7319 | &wc->flags[level]); | |
79787eaa JM |
7320 | if (ret < 0) { |
7321 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 7322 | path->locks[level] = 0; |
79787eaa JM |
7323 | return ret; |
7324 | } | |
2c47e605 YZ |
7325 | BUG_ON(wc->refs[level] == 0); |
7326 | if (wc->refs[level] == 1) { | |
bd681513 | 7327 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 7328 | path->locks[level] = 0; |
2c47e605 YZ |
7329 | return 1; |
7330 | } | |
f82d02d9 | 7331 | } |
2c47e605 | 7332 | } |
f82d02d9 | 7333 | |
2c47e605 YZ |
7334 | /* wc->stage == DROP_REFERENCE */ |
7335 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 7336 | |
2c47e605 YZ |
7337 | if (wc->refs[level] == 1) { |
7338 | if (level == 0) { | |
7339 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
66d7e7f0 AJ |
7340 | ret = btrfs_dec_ref(trans, root, eb, 1, |
7341 | wc->for_reloc); | |
2c47e605 | 7342 | else |
66d7e7f0 AJ |
7343 | ret = btrfs_dec_ref(trans, root, eb, 0, |
7344 | wc->for_reloc); | |
79787eaa | 7345 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7346 | } |
7347 | /* make block locked assertion in clean_tree_block happy */ | |
7348 | if (!path->locks[level] && | |
7349 | btrfs_header_generation(eb) == trans->transid) { | |
7350 | btrfs_tree_lock(eb); | |
7351 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7352 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7353 | } |
7354 | clean_tree_block(trans, root, eb); | |
7355 | } | |
7356 | ||
7357 | if (eb == root->node) { | |
7358 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7359 | parent = eb->start; | |
7360 | else | |
7361 | BUG_ON(root->root_key.objectid != | |
7362 | btrfs_header_owner(eb)); | |
7363 | } else { | |
7364 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7365 | parent = path->nodes[level + 1]->start; | |
7366 | else | |
7367 | BUG_ON(root->root_key.objectid != | |
7368 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 7369 | } |
f82d02d9 | 7370 | |
5581a51a | 7371 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
7372 | out: |
7373 | wc->refs[level] = 0; | |
7374 | wc->flags[level] = 0; | |
f0486c68 | 7375 | return 0; |
2c47e605 YZ |
7376 | } |
7377 | ||
7378 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
7379 | struct btrfs_root *root, | |
7380 | struct btrfs_path *path, | |
7381 | struct walk_control *wc) | |
7382 | { | |
2c47e605 | 7383 | int level = wc->level; |
94fcca9f | 7384 | int lookup_info = 1; |
2c47e605 YZ |
7385 | int ret; |
7386 | ||
7387 | while (level >= 0) { | |
94fcca9f | 7388 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
7389 | if (ret > 0) |
7390 | break; | |
7391 | ||
7392 | if (level == 0) | |
7393 | break; | |
7394 | ||
7a7965f8 YZ |
7395 | if (path->slots[level] >= |
7396 | btrfs_header_nritems(path->nodes[level])) | |
7397 | break; | |
7398 | ||
94fcca9f | 7399 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
7400 | if (ret > 0) { |
7401 | path->slots[level]++; | |
7402 | continue; | |
90d2c51d MX |
7403 | } else if (ret < 0) |
7404 | return ret; | |
1c4850e2 | 7405 | level = wc->level; |
f82d02d9 | 7406 | } |
f82d02d9 YZ |
7407 | return 0; |
7408 | } | |
7409 | ||
d397712b | 7410 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 7411 | struct btrfs_root *root, |
f82d02d9 | 7412 | struct btrfs_path *path, |
2c47e605 | 7413 | struct walk_control *wc, int max_level) |
20524f02 | 7414 | { |
2c47e605 | 7415 | int level = wc->level; |
20524f02 | 7416 | int ret; |
9f3a7427 | 7417 | |
2c47e605 YZ |
7418 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
7419 | while (level < max_level && path->nodes[level]) { | |
7420 | wc->level = level; | |
7421 | if (path->slots[level] + 1 < | |
7422 | btrfs_header_nritems(path->nodes[level])) { | |
7423 | path->slots[level]++; | |
20524f02 CM |
7424 | return 0; |
7425 | } else { | |
2c47e605 YZ |
7426 | ret = walk_up_proc(trans, root, path, wc); |
7427 | if (ret > 0) | |
7428 | return 0; | |
bd56b302 | 7429 | |
2c47e605 | 7430 | if (path->locks[level]) { |
bd681513 CM |
7431 | btrfs_tree_unlock_rw(path->nodes[level], |
7432 | path->locks[level]); | |
2c47e605 | 7433 | path->locks[level] = 0; |
f82d02d9 | 7434 | } |
2c47e605 YZ |
7435 | free_extent_buffer(path->nodes[level]); |
7436 | path->nodes[level] = NULL; | |
7437 | level++; | |
20524f02 CM |
7438 | } |
7439 | } | |
7440 | return 1; | |
7441 | } | |
7442 | ||
9aca1d51 | 7443 | /* |
2c47e605 YZ |
7444 | * drop a subvolume tree. |
7445 | * | |
7446 | * this function traverses the tree freeing any blocks that only | |
7447 | * referenced by the tree. | |
7448 | * | |
7449 | * when a shared tree block is found. this function decreases its | |
7450 | * reference count by one. if update_ref is true, this function | |
7451 | * also make sure backrefs for the shared block and all lower level | |
7452 | * blocks are properly updated. | |
9d1a2a3a DS |
7453 | * |
7454 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 7455 | */ |
2c536799 | 7456 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
7457 | struct btrfs_block_rsv *block_rsv, int update_ref, |
7458 | int for_reloc) | |
20524f02 | 7459 | { |
5caf2a00 | 7460 | struct btrfs_path *path; |
2c47e605 YZ |
7461 | struct btrfs_trans_handle *trans; |
7462 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 7463 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
7464 | struct walk_control *wc; |
7465 | struct btrfs_key key; | |
7466 | int err = 0; | |
7467 | int ret; | |
7468 | int level; | |
d29a9f62 | 7469 | bool root_dropped = false; |
20524f02 | 7470 | |
5caf2a00 | 7471 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
7472 | if (!path) { |
7473 | err = -ENOMEM; | |
7474 | goto out; | |
7475 | } | |
20524f02 | 7476 | |
2c47e605 | 7477 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
7478 | if (!wc) { |
7479 | btrfs_free_path(path); | |
cb1b69f4 TI |
7480 | err = -ENOMEM; |
7481 | goto out; | |
38a1a919 | 7482 | } |
2c47e605 | 7483 | |
a22285a6 | 7484 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7485 | if (IS_ERR(trans)) { |
7486 | err = PTR_ERR(trans); | |
7487 | goto out_free; | |
7488 | } | |
98d5dc13 | 7489 | |
3fd0a558 YZ |
7490 | if (block_rsv) |
7491 | trans->block_rsv = block_rsv; | |
2c47e605 | 7492 | |
9f3a7427 | 7493 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 7494 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
7495 | path->nodes[level] = btrfs_lock_root_node(root); |
7496 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 7497 | path->slots[level] = 0; |
bd681513 | 7498 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7499 | memset(&wc->update_progress, 0, |
7500 | sizeof(wc->update_progress)); | |
9f3a7427 | 7501 | } else { |
9f3a7427 | 7502 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
7503 | memcpy(&wc->update_progress, &key, |
7504 | sizeof(wc->update_progress)); | |
7505 | ||
6702ed49 | 7506 | level = root_item->drop_level; |
2c47e605 | 7507 | BUG_ON(level == 0); |
6702ed49 | 7508 | path->lowest_level = level; |
2c47e605 YZ |
7509 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
7510 | path->lowest_level = 0; | |
7511 | if (ret < 0) { | |
7512 | err = ret; | |
79787eaa | 7513 | goto out_end_trans; |
9f3a7427 | 7514 | } |
1c4850e2 | 7515 | WARN_ON(ret > 0); |
2c47e605 | 7516 | |
7d9eb12c CM |
7517 | /* |
7518 | * unlock our path, this is safe because only this | |
7519 | * function is allowed to delete this snapshot | |
7520 | */ | |
5d4f98a2 | 7521 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
7522 | |
7523 | level = btrfs_header_level(root->node); | |
7524 | while (1) { | |
7525 | btrfs_tree_lock(path->nodes[level]); | |
7526 | btrfs_set_lock_blocking(path->nodes[level]); | |
fec386ac | 7527 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7528 | |
7529 | ret = btrfs_lookup_extent_info(trans, root, | |
7530 | path->nodes[level]->start, | |
3173a18f | 7531 | level, 1, &wc->refs[level], |
2c47e605 | 7532 | &wc->flags[level]); |
79787eaa JM |
7533 | if (ret < 0) { |
7534 | err = ret; | |
7535 | goto out_end_trans; | |
7536 | } | |
2c47e605 YZ |
7537 | BUG_ON(wc->refs[level] == 0); |
7538 | ||
7539 | if (level == root_item->drop_level) | |
7540 | break; | |
7541 | ||
7542 | btrfs_tree_unlock(path->nodes[level]); | |
fec386ac | 7543 | path->locks[level] = 0; |
2c47e605 YZ |
7544 | WARN_ON(wc->refs[level] != 1); |
7545 | level--; | |
7546 | } | |
9f3a7427 | 7547 | } |
2c47e605 YZ |
7548 | |
7549 | wc->level = level; | |
7550 | wc->shared_level = -1; | |
7551 | wc->stage = DROP_REFERENCE; | |
7552 | wc->update_ref = update_ref; | |
7553 | wc->keep_locks = 0; | |
66d7e7f0 | 7554 | wc->for_reloc = for_reloc; |
1c4850e2 | 7555 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 7556 | |
d397712b | 7557 | while (1) { |
9d1a2a3a | 7558 | |
2c47e605 YZ |
7559 | ret = walk_down_tree(trans, root, path, wc); |
7560 | if (ret < 0) { | |
7561 | err = ret; | |
20524f02 | 7562 | break; |
2c47e605 | 7563 | } |
9aca1d51 | 7564 | |
2c47e605 YZ |
7565 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
7566 | if (ret < 0) { | |
7567 | err = ret; | |
20524f02 | 7568 | break; |
2c47e605 YZ |
7569 | } |
7570 | ||
7571 | if (ret > 0) { | |
7572 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
7573 | break; |
7574 | } | |
2c47e605 YZ |
7575 | |
7576 | if (wc->stage == DROP_REFERENCE) { | |
7577 | level = wc->level; | |
7578 | btrfs_node_key(path->nodes[level], | |
7579 | &root_item->drop_progress, | |
7580 | path->slots[level]); | |
7581 | root_item->drop_level = level; | |
7582 | } | |
7583 | ||
7584 | BUG_ON(wc->level == 0); | |
3c8f2422 JB |
7585 | if (btrfs_should_end_transaction(trans, tree_root) || |
7586 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { | |
2c47e605 YZ |
7587 | ret = btrfs_update_root(trans, tree_root, |
7588 | &root->root_key, | |
7589 | root_item); | |
79787eaa JM |
7590 | if (ret) { |
7591 | btrfs_abort_transaction(trans, tree_root, ret); | |
7592 | err = ret; | |
7593 | goto out_end_trans; | |
7594 | } | |
2c47e605 | 7595 | |
3fd0a558 | 7596 | btrfs_end_transaction_throttle(trans, tree_root); |
3c8f2422 JB |
7597 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
7598 | pr_debug("btrfs: drop snapshot early exit\n"); | |
7599 | err = -EAGAIN; | |
7600 | goto out_free; | |
7601 | } | |
7602 | ||
a22285a6 | 7603 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7604 | if (IS_ERR(trans)) { |
7605 | err = PTR_ERR(trans); | |
7606 | goto out_free; | |
7607 | } | |
3fd0a558 YZ |
7608 | if (block_rsv) |
7609 | trans->block_rsv = block_rsv; | |
c3e69d58 | 7610 | } |
20524f02 | 7611 | } |
b3b4aa74 | 7612 | btrfs_release_path(path); |
79787eaa JM |
7613 | if (err) |
7614 | goto out_end_trans; | |
2c47e605 YZ |
7615 | |
7616 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
7617 | if (ret) { |
7618 | btrfs_abort_transaction(trans, tree_root, ret); | |
7619 | goto out_end_trans; | |
7620 | } | |
2c47e605 | 7621 | |
76dda93c | 7622 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
cb517eab MX |
7623 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
7624 | NULL, NULL); | |
79787eaa JM |
7625 | if (ret < 0) { |
7626 | btrfs_abort_transaction(trans, tree_root, ret); | |
7627 | err = ret; | |
7628 | goto out_end_trans; | |
7629 | } else if (ret > 0) { | |
84cd948c JB |
7630 | /* if we fail to delete the orphan item this time |
7631 | * around, it'll get picked up the next time. | |
7632 | * | |
7633 | * The most common failure here is just -ENOENT. | |
7634 | */ | |
7635 | btrfs_del_orphan_item(trans, tree_root, | |
7636 | root->root_key.objectid); | |
76dda93c YZ |
7637 | } |
7638 | } | |
7639 | ||
7640 | if (root->in_radix) { | |
cb517eab | 7641 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); |
76dda93c YZ |
7642 | } else { |
7643 | free_extent_buffer(root->node); | |
7644 | free_extent_buffer(root->commit_root); | |
b0feb9d9 | 7645 | btrfs_put_fs_root(root); |
76dda93c | 7646 | } |
d29a9f62 | 7647 | root_dropped = true; |
79787eaa | 7648 | out_end_trans: |
3fd0a558 | 7649 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 7650 | out_free: |
2c47e605 | 7651 | kfree(wc); |
5caf2a00 | 7652 | btrfs_free_path(path); |
cb1b69f4 | 7653 | out: |
d29a9f62 JB |
7654 | /* |
7655 | * So if we need to stop dropping the snapshot for whatever reason we | |
7656 | * need to make sure to add it back to the dead root list so that we | |
7657 | * keep trying to do the work later. This also cleans up roots if we | |
7658 | * don't have it in the radix (like when we recover after a power fail | |
7659 | * or unmount) so we don't leak memory. | |
7660 | */ | |
7661 | if (root_dropped == false) | |
7662 | btrfs_add_dead_root(root); | |
cb1b69f4 TI |
7663 | if (err) |
7664 | btrfs_std_error(root->fs_info, err); | |
2c536799 | 7665 | return err; |
20524f02 | 7666 | } |
9078a3e1 | 7667 | |
2c47e605 YZ |
7668 | /* |
7669 | * drop subtree rooted at tree block 'node'. | |
7670 | * | |
7671 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 7672 | * only used by relocation code |
2c47e605 | 7673 | */ |
f82d02d9 YZ |
7674 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
7675 | struct btrfs_root *root, | |
7676 | struct extent_buffer *node, | |
7677 | struct extent_buffer *parent) | |
7678 | { | |
7679 | struct btrfs_path *path; | |
2c47e605 | 7680 | struct walk_control *wc; |
f82d02d9 YZ |
7681 | int level; |
7682 | int parent_level; | |
7683 | int ret = 0; | |
7684 | int wret; | |
7685 | ||
2c47e605 YZ |
7686 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
7687 | ||
f82d02d9 | 7688 | path = btrfs_alloc_path(); |
db5b493a TI |
7689 | if (!path) |
7690 | return -ENOMEM; | |
f82d02d9 | 7691 | |
2c47e605 | 7692 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
7693 | if (!wc) { |
7694 | btrfs_free_path(path); | |
7695 | return -ENOMEM; | |
7696 | } | |
2c47e605 | 7697 | |
b9447ef8 | 7698 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
7699 | parent_level = btrfs_header_level(parent); |
7700 | extent_buffer_get(parent); | |
7701 | path->nodes[parent_level] = parent; | |
7702 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
7703 | ||
b9447ef8 | 7704 | btrfs_assert_tree_locked(node); |
f82d02d9 | 7705 | level = btrfs_header_level(node); |
f82d02d9 YZ |
7706 | path->nodes[level] = node; |
7707 | path->slots[level] = 0; | |
bd681513 | 7708 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7709 | |
7710 | wc->refs[parent_level] = 1; | |
7711 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7712 | wc->level = level; | |
7713 | wc->shared_level = -1; | |
7714 | wc->stage = DROP_REFERENCE; | |
7715 | wc->update_ref = 0; | |
7716 | wc->keep_locks = 1; | |
66d7e7f0 | 7717 | wc->for_reloc = 1; |
1c4850e2 | 7718 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
7719 | |
7720 | while (1) { | |
2c47e605 YZ |
7721 | wret = walk_down_tree(trans, root, path, wc); |
7722 | if (wret < 0) { | |
f82d02d9 | 7723 | ret = wret; |
f82d02d9 | 7724 | break; |
2c47e605 | 7725 | } |
f82d02d9 | 7726 | |
2c47e605 | 7727 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
7728 | if (wret < 0) |
7729 | ret = wret; | |
7730 | if (wret != 0) | |
7731 | break; | |
7732 | } | |
7733 | ||
2c47e605 | 7734 | kfree(wc); |
f82d02d9 YZ |
7735 | btrfs_free_path(path); |
7736 | return ret; | |
7737 | } | |
7738 | ||
ec44a35c CM |
7739 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7740 | { | |
7741 | u64 num_devices; | |
fc67c450 | 7742 | u64 stripped; |
e4d8ec0f | 7743 | |
fc67c450 ID |
7744 | /* |
7745 | * if restripe for this chunk_type is on pick target profile and | |
7746 | * return, otherwise do the usual balance | |
7747 | */ | |
7748 | stripped = get_restripe_target(root->fs_info, flags); | |
7749 | if (stripped) | |
7750 | return extended_to_chunk(stripped); | |
e4d8ec0f | 7751 | |
cd02dca5 CM |
7752 | /* |
7753 | * we add in the count of missing devices because we want | |
7754 | * to make sure that any RAID levels on a degraded FS | |
7755 | * continue to be honored. | |
7756 | */ | |
7757 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7758 | root->fs_info->fs_devices->missing_devices; | |
7759 | ||
fc67c450 | 7760 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 7761 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
7762 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
7763 | ||
ec44a35c CM |
7764 | if (num_devices == 1) { |
7765 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7766 | stripped = flags & ~stripped; | |
7767 | ||
7768 | /* turn raid0 into single device chunks */ | |
7769 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7770 | return stripped; | |
7771 | ||
7772 | /* turn mirroring into duplication */ | |
7773 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7774 | BTRFS_BLOCK_GROUP_RAID10)) | |
7775 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
7776 | } else { |
7777 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7778 | if (flags & stripped) |
7779 | return flags; | |
7780 | ||
7781 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7782 | stripped = flags & ~stripped; | |
7783 | ||
7784 | /* switch duplicated blocks with raid1 */ | |
7785 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7786 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7787 | ||
e3176ca2 | 7788 | /* this is drive concat, leave it alone */ |
ec44a35c | 7789 | } |
e3176ca2 | 7790 | |
ec44a35c CM |
7791 | return flags; |
7792 | } | |
7793 | ||
199c36ea | 7794 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 7795 | { |
f0486c68 YZ |
7796 | struct btrfs_space_info *sinfo = cache->space_info; |
7797 | u64 num_bytes; | |
199c36ea | 7798 | u64 min_allocable_bytes; |
f0486c68 | 7799 | int ret = -ENOSPC; |
0ef3e66b | 7800 | |
c286ac48 | 7801 | |
199c36ea MX |
7802 | /* |
7803 | * We need some metadata space and system metadata space for | |
7804 | * allocating chunks in some corner cases until we force to set | |
7805 | * it to be readonly. | |
7806 | */ | |
7807 | if ((sinfo->flags & | |
7808 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
7809 | !force) | |
7810 | min_allocable_bytes = 1 * 1024 * 1024; | |
7811 | else | |
7812 | min_allocable_bytes = 0; | |
7813 | ||
f0486c68 YZ |
7814 | spin_lock(&sinfo->lock); |
7815 | spin_lock(&cache->lock); | |
61cfea9b W |
7816 | |
7817 | if (cache->ro) { | |
7818 | ret = 0; | |
7819 | goto out; | |
7820 | } | |
7821 | ||
f0486c68 YZ |
7822 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
7823 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7824 | ||
7825 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
7826 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
7827 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 7828 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
7829 | cache->ro = 1; |
7830 | ret = 0; | |
7831 | } | |
61cfea9b | 7832 | out: |
f0486c68 YZ |
7833 | spin_unlock(&cache->lock); |
7834 | spin_unlock(&sinfo->lock); | |
7835 | return ret; | |
7836 | } | |
7d9eb12c | 7837 | |
f0486c68 YZ |
7838 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7839 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7840 | |
f0486c68 YZ |
7841 | { |
7842 | struct btrfs_trans_handle *trans; | |
7843 | u64 alloc_flags; | |
7844 | int ret; | |
7d9eb12c | 7845 | |
f0486c68 | 7846 | BUG_ON(cache->ro); |
0ef3e66b | 7847 | |
ff5714cc | 7848 | trans = btrfs_join_transaction(root); |
79787eaa JM |
7849 | if (IS_ERR(trans)) |
7850 | return PTR_ERR(trans); | |
5d4f98a2 | 7851 | |
f0486c68 | 7852 | alloc_flags = update_block_group_flags(root, cache->flags); |
79787eaa | 7853 | if (alloc_flags != cache->flags) { |
698d0082 | 7854 | ret = do_chunk_alloc(trans, root, alloc_flags, |
79787eaa JM |
7855 | CHUNK_ALLOC_FORCE); |
7856 | if (ret < 0) | |
7857 | goto out; | |
7858 | } | |
5d4f98a2 | 7859 | |
199c36ea | 7860 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7861 | if (!ret) |
7862 | goto out; | |
7863 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 7864 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7865 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
7866 | if (ret < 0) |
7867 | goto out; | |
199c36ea | 7868 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7869 | out: |
7870 | btrfs_end_transaction(trans, root); | |
7871 | return ret; | |
7872 | } | |
5d4f98a2 | 7873 | |
c87f08ca CM |
7874 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
7875 | struct btrfs_root *root, u64 type) | |
7876 | { | |
7877 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 7878 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7879 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
7880 | } |
7881 | ||
6d07bcec MX |
7882 | /* |
7883 | * helper to account the unused space of all the readonly block group in the | |
7884 | * list. takes mirrors into account. | |
7885 | */ | |
7886 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
7887 | { | |
7888 | struct btrfs_block_group_cache *block_group; | |
7889 | u64 free_bytes = 0; | |
7890 | int factor; | |
7891 | ||
7892 | list_for_each_entry(block_group, groups_list, list) { | |
7893 | spin_lock(&block_group->lock); | |
7894 | ||
7895 | if (!block_group->ro) { | |
7896 | spin_unlock(&block_group->lock); | |
7897 | continue; | |
7898 | } | |
7899 | ||
7900 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7901 | BTRFS_BLOCK_GROUP_RAID10 | | |
7902 | BTRFS_BLOCK_GROUP_DUP)) | |
7903 | factor = 2; | |
7904 | else | |
7905 | factor = 1; | |
7906 | ||
7907 | free_bytes += (block_group->key.offset - | |
7908 | btrfs_block_group_used(&block_group->item)) * | |
7909 | factor; | |
7910 | ||
7911 | spin_unlock(&block_group->lock); | |
7912 | } | |
7913 | ||
7914 | return free_bytes; | |
7915 | } | |
7916 | ||
7917 | /* | |
7918 | * helper to account the unused space of all the readonly block group in the | |
7919 | * space_info. takes mirrors into account. | |
7920 | */ | |
7921 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
7922 | { | |
7923 | int i; | |
7924 | u64 free_bytes = 0; | |
7925 | ||
7926 | spin_lock(&sinfo->lock); | |
7927 | ||
7928 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
7929 | if (!list_empty(&sinfo->block_groups[i])) | |
7930 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
7931 | &sinfo->block_groups[i]); | |
7932 | ||
7933 | spin_unlock(&sinfo->lock); | |
7934 | ||
7935 | return free_bytes; | |
7936 | } | |
7937 | ||
143bede5 | 7938 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
f0486c68 | 7939 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 7940 | { |
f0486c68 YZ |
7941 | struct btrfs_space_info *sinfo = cache->space_info; |
7942 | u64 num_bytes; | |
7943 | ||
7944 | BUG_ON(!cache->ro); | |
7945 | ||
7946 | spin_lock(&sinfo->lock); | |
7947 | spin_lock(&cache->lock); | |
7948 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7949 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7950 | sinfo->bytes_readonly -= num_bytes; | |
7951 | cache->ro = 0; | |
7952 | spin_unlock(&cache->lock); | |
7953 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
7954 | } |
7955 | ||
ba1bf481 JB |
7956 | /* |
7957 | * checks to see if its even possible to relocate this block group. | |
7958 | * | |
7959 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
7960 | * ok to go ahead and try. | |
7961 | */ | |
7962 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 7963 | { |
ba1bf481 JB |
7964 | struct btrfs_block_group_cache *block_group; |
7965 | struct btrfs_space_info *space_info; | |
7966 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
7967 | struct btrfs_device *device; | |
6df9a95e | 7968 | struct btrfs_trans_handle *trans; |
cdcb725c | 7969 | u64 min_free; |
6719db6a JB |
7970 | u64 dev_min = 1; |
7971 | u64 dev_nr = 0; | |
4a5e98f5 | 7972 | u64 target; |
cdcb725c | 7973 | int index; |
ba1bf481 JB |
7974 | int full = 0; |
7975 | int ret = 0; | |
1a40e23b | 7976 | |
ba1bf481 | 7977 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 7978 | |
ba1bf481 JB |
7979 | /* odd, couldn't find the block group, leave it alone */ |
7980 | if (!block_group) | |
7981 | return -1; | |
1a40e23b | 7982 | |
cdcb725c | 7983 | min_free = btrfs_block_group_used(&block_group->item); |
7984 | ||
ba1bf481 | 7985 | /* no bytes used, we're good */ |
cdcb725c | 7986 | if (!min_free) |
1a40e23b ZY |
7987 | goto out; |
7988 | ||
ba1bf481 JB |
7989 | space_info = block_group->space_info; |
7990 | spin_lock(&space_info->lock); | |
17d217fe | 7991 | |
ba1bf481 | 7992 | full = space_info->full; |
17d217fe | 7993 | |
ba1bf481 JB |
7994 | /* |
7995 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
7996 | * relocate it unless we're able to allocate a new chunk below. |
7997 | * | |
7998 | * Otherwise, we need to make sure we have room in the space to handle | |
7999 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 8000 | */ |
7ce618db | 8001 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 8002 | (space_info->bytes_used + space_info->bytes_reserved + |
8003 | space_info->bytes_pinned + space_info->bytes_readonly + | |
8004 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
8005 | spin_unlock(&space_info->lock); |
8006 | goto out; | |
17d217fe | 8007 | } |
ba1bf481 | 8008 | spin_unlock(&space_info->lock); |
ea8c2819 | 8009 | |
ba1bf481 JB |
8010 | /* |
8011 | * ok we don't have enough space, but maybe we have free space on our | |
8012 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
8013 | * alloc devices and guess if we have enough space. if this block |
8014 | * group is going to be restriped, run checks against the target | |
8015 | * profile instead of the current one. | |
ba1bf481 JB |
8016 | */ |
8017 | ret = -1; | |
ea8c2819 | 8018 | |
cdcb725c | 8019 | /* |
8020 | * index: | |
8021 | * 0: raid10 | |
8022 | * 1: raid1 | |
8023 | * 2: dup | |
8024 | * 3: raid0 | |
8025 | * 4: single | |
8026 | */ | |
4a5e98f5 ID |
8027 | target = get_restripe_target(root->fs_info, block_group->flags); |
8028 | if (target) { | |
31e50229 | 8029 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
8030 | } else { |
8031 | /* | |
8032 | * this is just a balance, so if we were marked as full | |
8033 | * we know there is no space for a new chunk | |
8034 | */ | |
8035 | if (full) | |
8036 | goto out; | |
8037 | ||
8038 | index = get_block_group_index(block_group); | |
8039 | } | |
8040 | ||
e6ec716f | 8041 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 8042 | dev_min = 4; |
6719db6a JB |
8043 | /* Divide by 2 */ |
8044 | min_free >>= 1; | |
e6ec716f | 8045 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 8046 | dev_min = 2; |
e6ec716f | 8047 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
8048 | /* Multiply by 2 */ |
8049 | min_free <<= 1; | |
e6ec716f | 8050 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 8051 | dev_min = fs_devices->rw_devices; |
6719db6a | 8052 | do_div(min_free, dev_min); |
cdcb725c | 8053 | } |
8054 | ||
6df9a95e JB |
8055 | /* We need to do this so that we can look at pending chunks */ |
8056 | trans = btrfs_join_transaction(root); | |
8057 | if (IS_ERR(trans)) { | |
8058 | ret = PTR_ERR(trans); | |
8059 | goto out; | |
8060 | } | |
8061 | ||
ba1bf481 JB |
8062 | mutex_lock(&root->fs_info->chunk_mutex); |
8063 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 8064 | u64 dev_offset; |
56bec294 | 8065 | |
ba1bf481 JB |
8066 | /* |
8067 | * check to make sure we can actually find a chunk with enough | |
8068 | * space to fit our block group in. | |
8069 | */ | |
63a212ab SB |
8070 | if (device->total_bytes > device->bytes_used + min_free && |
8071 | !device->is_tgtdev_for_dev_replace) { | |
6df9a95e | 8072 | ret = find_free_dev_extent(trans, device, min_free, |
7bfc837d | 8073 | &dev_offset, NULL); |
ba1bf481 | 8074 | if (!ret) |
cdcb725c | 8075 | dev_nr++; |
8076 | ||
8077 | if (dev_nr >= dev_min) | |
73e48b27 | 8078 | break; |
cdcb725c | 8079 | |
ba1bf481 | 8080 | ret = -1; |
725c8463 | 8081 | } |
edbd8d4e | 8082 | } |
ba1bf481 | 8083 | mutex_unlock(&root->fs_info->chunk_mutex); |
6df9a95e | 8084 | btrfs_end_transaction(trans, root); |
edbd8d4e | 8085 | out: |
ba1bf481 | 8086 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
8087 | return ret; |
8088 | } | |
8089 | ||
b2950863 CH |
8090 | static int find_first_block_group(struct btrfs_root *root, |
8091 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 8092 | { |
925baedd | 8093 | int ret = 0; |
0b86a832 CM |
8094 | struct btrfs_key found_key; |
8095 | struct extent_buffer *leaf; | |
8096 | int slot; | |
edbd8d4e | 8097 | |
0b86a832 CM |
8098 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
8099 | if (ret < 0) | |
925baedd CM |
8100 | goto out; |
8101 | ||
d397712b | 8102 | while (1) { |
0b86a832 | 8103 | slot = path->slots[0]; |
edbd8d4e | 8104 | leaf = path->nodes[0]; |
0b86a832 CM |
8105 | if (slot >= btrfs_header_nritems(leaf)) { |
8106 | ret = btrfs_next_leaf(root, path); | |
8107 | if (ret == 0) | |
8108 | continue; | |
8109 | if (ret < 0) | |
925baedd | 8110 | goto out; |
0b86a832 | 8111 | break; |
edbd8d4e | 8112 | } |
0b86a832 | 8113 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 8114 | |
0b86a832 | 8115 | if (found_key.objectid >= key->objectid && |
925baedd CM |
8116 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
8117 | ret = 0; | |
8118 | goto out; | |
8119 | } | |
0b86a832 | 8120 | path->slots[0]++; |
edbd8d4e | 8121 | } |
925baedd | 8122 | out: |
0b86a832 | 8123 | return ret; |
edbd8d4e CM |
8124 | } |
8125 | ||
0af3d00b JB |
8126 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
8127 | { | |
8128 | struct btrfs_block_group_cache *block_group; | |
8129 | u64 last = 0; | |
8130 | ||
8131 | while (1) { | |
8132 | struct inode *inode; | |
8133 | ||
8134 | block_group = btrfs_lookup_first_block_group(info, last); | |
8135 | while (block_group) { | |
8136 | spin_lock(&block_group->lock); | |
8137 | if (block_group->iref) | |
8138 | break; | |
8139 | spin_unlock(&block_group->lock); | |
8140 | block_group = next_block_group(info->tree_root, | |
8141 | block_group); | |
8142 | } | |
8143 | if (!block_group) { | |
8144 | if (last == 0) | |
8145 | break; | |
8146 | last = 0; | |
8147 | continue; | |
8148 | } | |
8149 | ||
8150 | inode = block_group->inode; | |
8151 | block_group->iref = 0; | |
8152 | block_group->inode = NULL; | |
8153 | spin_unlock(&block_group->lock); | |
8154 | iput(inode); | |
8155 | last = block_group->key.objectid + block_group->key.offset; | |
8156 | btrfs_put_block_group(block_group); | |
8157 | } | |
8158 | } | |
8159 | ||
1a40e23b ZY |
8160 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
8161 | { | |
8162 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 8163 | struct btrfs_space_info *space_info; |
11833d66 | 8164 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
8165 | struct rb_node *n; |
8166 | ||
11833d66 YZ |
8167 | down_write(&info->extent_commit_sem); |
8168 | while (!list_empty(&info->caching_block_groups)) { | |
8169 | caching_ctl = list_entry(info->caching_block_groups.next, | |
8170 | struct btrfs_caching_control, list); | |
8171 | list_del(&caching_ctl->list); | |
8172 | put_caching_control(caching_ctl); | |
8173 | } | |
8174 | up_write(&info->extent_commit_sem); | |
8175 | ||
1a40e23b ZY |
8176 | spin_lock(&info->block_group_cache_lock); |
8177 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
8178 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
8179 | cache_node); | |
1a40e23b ZY |
8180 | rb_erase(&block_group->cache_node, |
8181 | &info->block_group_cache_tree); | |
d899e052 YZ |
8182 | spin_unlock(&info->block_group_cache_lock); |
8183 | ||
80eb234a | 8184 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 8185 | list_del(&block_group->list); |
80eb234a | 8186 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 8187 | |
817d52f8 | 8188 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8189 | wait_block_group_cache_done(block_group); |
817d52f8 | 8190 | |
3c14874a JB |
8191 | /* |
8192 | * We haven't cached this block group, which means we could | |
8193 | * possibly have excluded extents on this block group. | |
8194 | */ | |
8195 | if (block_group->cached == BTRFS_CACHE_NO) | |
8196 | free_excluded_extents(info->extent_root, block_group); | |
8197 | ||
817d52f8 | 8198 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 8199 | btrfs_put_block_group(block_group); |
d899e052 YZ |
8200 | |
8201 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
8202 | } |
8203 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
8204 | |
8205 | /* now that all the block groups are freed, go through and | |
8206 | * free all the space_info structs. This is only called during | |
8207 | * the final stages of unmount, and so we know nobody is | |
8208 | * using them. We call synchronize_rcu() once before we start, | |
8209 | * just to be on the safe side. | |
8210 | */ | |
8211 | synchronize_rcu(); | |
8212 | ||
8929ecfa YZ |
8213 | release_global_block_rsv(info); |
8214 | ||
4184ea7f CM |
8215 | while(!list_empty(&info->space_info)) { |
8216 | space_info = list_entry(info->space_info.next, | |
8217 | struct btrfs_space_info, | |
8218 | list); | |
b069e0c3 DS |
8219 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
8220 | if (space_info->bytes_pinned > 0 || | |
8221 | space_info->bytes_reserved > 0 || | |
8222 | space_info->bytes_may_use > 0) { | |
8223 | WARN_ON(1); | |
8224 | dump_space_info(space_info, 0, 0); | |
8225 | } | |
f0486c68 | 8226 | } |
b150a4f1 | 8227 | percpu_counter_destroy(&space_info->total_bytes_pinned); |
4184ea7f CM |
8228 | list_del(&space_info->list); |
8229 | kfree(space_info); | |
8230 | } | |
1a40e23b ZY |
8231 | return 0; |
8232 | } | |
8233 | ||
b742bb82 YZ |
8234 | static void __link_block_group(struct btrfs_space_info *space_info, |
8235 | struct btrfs_block_group_cache *cache) | |
8236 | { | |
8237 | int index = get_block_group_index(cache); | |
8238 | ||
8239 | down_write(&space_info->groups_sem); | |
8240 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
8241 | up_write(&space_info->groups_sem); | |
8242 | } | |
8243 | ||
9078a3e1 CM |
8244 | int btrfs_read_block_groups(struct btrfs_root *root) |
8245 | { | |
8246 | struct btrfs_path *path; | |
8247 | int ret; | |
9078a3e1 | 8248 | struct btrfs_block_group_cache *cache; |
be744175 | 8249 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 8250 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
8251 | struct btrfs_key key; |
8252 | struct btrfs_key found_key; | |
5f39d397 | 8253 | struct extent_buffer *leaf; |
0af3d00b JB |
8254 | int need_clear = 0; |
8255 | u64 cache_gen; | |
96b5179d | 8256 | |
be744175 | 8257 | root = info->extent_root; |
9078a3e1 | 8258 | key.objectid = 0; |
0b86a832 | 8259 | key.offset = 0; |
9078a3e1 | 8260 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
8261 | path = btrfs_alloc_path(); |
8262 | if (!path) | |
8263 | return -ENOMEM; | |
026fd317 | 8264 | path->reada = 1; |
9078a3e1 | 8265 | |
6c41761f | 8266 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 8267 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 8268 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 8269 | need_clear = 1; |
88c2ba3b JB |
8270 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
8271 | need_clear = 1; | |
0af3d00b | 8272 | |
d397712b | 8273 | while (1) { |
0b86a832 | 8274 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
8275 | if (ret > 0) |
8276 | break; | |
0b86a832 CM |
8277 | if (ret != 0) |
8278 | goto error; | |
5f39d397 CM |
8279 | leaf = path->nodes[0]; |
8280 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 8281 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 8282 | if (!cache) { |
0b86a832 | 8283 | ret = -ENOMEM; |
f0486c68 | 8284 | goto error; |
9078a3e1 | 8285 | } |
34d52cb6 LZ |
8286 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8287 | GFP_NOFS); | |
8288 | if (!cache->free_space_ctl) { | |
8289 | kfree(cache); | |
8290 | ret = -ENOMEM; | |
8291 | goto error; | |
8292 | } | |
3e1ad54f | 8293 | |
d2fb3437 | 8294 | atomic_set(&cache->count, 1); |
c286ac48 | 8295 | spin_lock_init(&cache->lock); |
817d52f8 | 8296 | cache->fs_info = info; |
0f9dd46c | 8297 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8298 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 8299 | |
cf7c1ef6 LB |
8300 | if (need_clear) { |
8301 | /* | |
8302 | * When we mount with old space cache, we need to | |
8303 | * set BTRFS_DC_CLEAR and set dirty flag. | |
8304 | * | |
8305 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
8306 | * truncate the old free space cache inode and | |
8307 | * setup a new one. | |
8308 | * b) Setting 'dirty flag' makes sure that we flush | |
8309 | * the new space cache info onto disk. | |
8310 | */ | |
0af3d00b | 8311 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 LB |
8312 | if (btrfs_test_opt(root, SPACE_CACHE)) |
8313 | cache->dirty = 1; | |
8314 | } | |
0af3d00b | 8315 | |
5f39d397 CM |
8316 | read_extent_buffer(leaf, &cache->item, |
8317 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
8318 | sizeof(cache->item)); | |
9078a3e1 | 8319 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 8320 | |
9078a3e1 | 8321 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 8322 | btrfs_release_path(path); |
0b86a832 | 8323 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 | 8324 | cache->sectorsize = root->sectorsize; |
53b381b3 DW |
8325 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8326 | &root->fs_info->mapping_tree, | |
8327 | found_key.objectid); | |
34d52cb6 LZ |
8328 | btrfs_init_free_space_ctl(cache); |
8329 | ||
3c14874a JB |
8330 | /* |
8331 | * We need to exclude the super stripes now so that the space | |
8332 | * info has super bytes accounted for, otherwise we'll think | |
8333 | * we have more space than we actually do. | |
8334 | */ | |
835d974f JB |
8335 | ret = exclude_super_stripes(root, cache); |
8336 | if (ret) { | |
8337 | /* | |
8338 | * We may have excluded something, so call this just in | |
8339 | * case. | |
8340 | */ | |
8341 | free_excluded_extents(root, cache); | |
8342 | kfree(cache->free_space_ctl); | |
8343 | kfree(cache); | |
8344 | goto error; | |
8345 | } | |
3c14874a | 8346 | |
817d52f8 JB |
8347 | /* |
8348 | * check for two cases, either we are full, and therefore | |
8349 | * don't need to bother with the caching work since we won't | |
8350 | * find any space, or we are empty, and we can just add all | |
8351 | * the space in and be done with it. This saves us _alot_ of | |
8352 | * time, particularly in the full case. | |
8353 | */ | |
8354 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 8355 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8356 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8357 | free_excluded_extents(root, cache); |
817d52f8 | 8358 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 8359 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
8360 | cache->cached = BTRFS_CACHE_FINISHED; |
8361 | add_new_free_space(cache, root->fs_info, | |
8362 | found_key.objectid, | |
8363 | found_key.objectid + | |
8364 | found_key.offset); | |
11833d66 | 8365 | free_excluded_extents(root, cache); |
817d52f8 | 8366 | } |
96b5179d | 8367 | |
8c579fe7 JB |
8368 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8369 | if (ret) { | |
8370 | btrfs_remove_free_space_cache(cache); | |
8371 | btrfs_put_block_group(cache); | |
8372 | goto error; | |
8373 | } | |
8374 | ||
6324fbf3 CM |
8375 | ret = update_space_info(info, cache->flags, found_key.offset, |
8376 | btrfs_block_group_used(&cache->item), | |
8377 | &space_info); | |
8c579fe7 JB |
8378 | if (ret) { |
8379 | btrfs_remove_free_space_cache(cache); | |
8380 | spin_lock(&info->block_group_cache_lock); | |
8381 | rb_erase(&cache->cache_node, | |
8382 | &info->block_group_cache_tree); | |
8383 | spin_unlock(&info->block_group_cache_lock); | |
8384 | btrfs_put_block_group(cache); | |
8385 | goto error; | |
8386 | } | |
8387 | ||
6324fbf3 | 8388 | cache->space_info = space_info; |
1b2da372 | 8389 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8390 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8391 | spin_unlock(&cache->space_info->lock); |
8392 | ||
b742bb82 | 8393 | __link_block_group(space_info, cache); |
0f9dd46c | 8394 | |
75ccf47d | 8395 | set_avail_alloc_bits(root->fs_info, cache->flags); |
2b82032c | 8396 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 8397 | set_block_group_ro(cache, 1); |
9078a3e1 | 8398 | } |
b742bb82 YZ |
8399 | |
8400 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8401 | if (!(get_alloc_profile(root, space_info->flags) & | |
8402 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8403 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
8404 | BTRFS_BLOCK_GROUP_RAID5 | |
8405 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
8406 | BTRFS_BLOCK_GROUP_DUP))) |
8407 | continue; | |
8408 | /* | |
8409 | * avoid allocating from un-mirrored block group if there are | |
8410 | * mirrored block groups. | |
8411 | */ | |
8412 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
199c36ea | 8413 | set_block_group_ro(cache, 1); |
b742bb82 | 8414 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
199c36ea | 8415 | set_block_group_ro(cache, 1); |
9078a3e1 | 8416 | } |
f0486c68 YZ |
8417 | |
8418 | init_global_block_rsv(info); | |
0b86a832 CM |
8419 | ret = 0; |
8420 | error: | |
9078a3e1 | 8421 | btrfs_free_path(path); |
0b86a832 | 8422 | return ret; |
9078a3e1 | 8423 | } |
6324fbf3 | 8424 | |
ea658bad JB |
8425 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
8426 | struct btrfs_root *root) | |
8427 | { | |
8428 | struct btrfs_block_group_cache *block_group, *tmp; | |
8429 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
8430 | struct btrfs_block_group_item item; | |
8431 | struct btrfs_key key; | |
8432 | int ret = 0; | |
8433 | ||
8434 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, | |
8435 | new_bg_list) { | |
8436 | list_del_init(&block_group->new_bg_list); | |
8437 | ||
8438 | if (ret) | |
8439 | continue; | |
8440 | ||
8441 | spin_lock(&block_group->lock); | |
8442 | memcpy(&item, &block_group->item, sizeof(item)); | |
8443 | memcpy(&key, &block_group->key, sizeof(key)); | |
8444 | spin_unlock(&block_group->lock); | |
8445 | ||
8446 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
8447 | sizeof(item)); | |
8448 | if (ret) | |
8449 | btrfs_abort_transaction(trans, extent_root, ret); | |
6df9a95e JB |
8450 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
8451 | key.objectid, key.offset); | |
8452 | if (ret) | |
8453 | btrfs_abort_transaction(trans, extent_root, ret); | |
ea658bad JB |
8454 | } |
8455 | } | |
8456 | ||
6324fbf3 CM |
8457 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
8458 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8459 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8460 | u64 size) |
8461 | { | |
8462 | int ret; | |
6324fbf3 CM |
8463 | struct btrfs_root *extent_root; |
8464 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8465 | |
8466 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8467 | |
12fcfd22 | 8468 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8469 | |
8f18cf13 | 8470 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8471 | if (!cache) |
8472 | return -ENOMEM; | |
34d52cb6 LZ |
8473 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8474 | GFP_NOFS); | |
8475 | if (!cache->free_space_ctl) { | |
8476 | kfree(cache); | |
8477 | return -ENOMEM; | |
8478 | } | |
0f9dd46c | 8479 | |
e17cade2 | 8480 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8481 | cache->key.offset = size; |
d2fb3437 | 8482 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 8483 | cache->sectorsize = root->sectorsize; |
0af3d00b | 8484 | cache->fs_info = root->fs_info; |
53b381b3 DW |
8485 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8486 | &root->fs_info->mapping_tree, | |
8487 | chunk_offset); | |
96303081 | 8488 | |
d2fb3437 | 8489 | atomic_set(&cache->count, 1); |
c286ac48 | 8490 | spin_lock_init(&cache->lock); |
0f9dd46c | 8491 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8492 | INIT_LIST_HEAD(&cache->cluster_list); |
ea658bad | 8493 | INIT_LIST_HEAD(&cache->new_bg_list); |
0ef3e66b | 8494 | |
34d52cb6 LZ |
8495 | btrfs_init_free_space_ctl(cache); |
8496 | ||
6324fbf3 | 8497 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8498 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8499 | cache->flags = type; | |
8500 | btrfs_set_block_group_flags(&cache->item, type); | |
8501 | ||
11833d66 | 8502 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8503 | cache->cached = BTRFS_CACHE_FINISHED; |
835d974f JB |
8504 | ret = exclude_super_stripes(root, cache); |
8505 | if (ret) { | |
8506 | /* | |
8507 | * We may have excluded something, so call this just in | |
8508 | * case. | |
8509 | */ | |
8510 | free_excluded_extents(root, cache); | |
8511 | kfree(cache->free_space_ctl); | |
8512 | kfree(cache); | |
8513 | return ret; | |
8514 | } | |
96303081 | 8515 | |
817d52f8 JB |
8516 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8517 | chunk_offset + size); | |
8518 | ||
11833d66 YZ |
8519 | free_excluded_extents(root, cache); |
8520 | ||
8c579fe7 JB |
8521 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8522 | if (ret) { | |
8523 | btrfs_remove_free_space_cache(cache); | |
8524 | btrfs_put_block_group(cache); | |
8525 | return ret; | |
8526 | } | |
8527 | ||
6324fbf3 CM |
8528 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8529 | &cache->space_info); | |
8c579fe7 JB |
8530 | if (ret) { |
8531 | btrfs_remove_free_space_cache(cache); | |
8532 | spin_lock(&root->fs_info->block_group_cache_lock); | |
8533 | rb_erase(&cache->cache_node, | |
8534 | &root->fs_info->block_group_cache_tree); | |
8535 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
8536 | btrfs_put_block_group(cache); | |
8537 | return ret; | |
8538 | } | |
c7c144db | 8539 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
8540 | |
8541 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8542 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8543 | spin_unlock(&cache->space_info->lock); |
8544 | ||
b742bb82 | 8545 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8546 | |
ea658bad | 8547 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
6324fbf3 | 8548 | |
d18a2c44 | 8549 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8550 | |
6324fbf3 CM |
8551 | return 0; |
8552 | } | |
1a40e23b | 8553 | |
10ea00f5 ID |
8554 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
8555 | { | |
899c81ea ID |
8556 | u64 extra_flags = chunk_to_extended(flags) & |
8557 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 8558 | |
de98ced9 | 8559 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8560 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
8561 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
8562 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
8563 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
8564 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
8565 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 8566 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8567 | } |
8568 | ||
1a40e23b ZY |
8569 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
8570 | struct btrfs_root *root, u64 group_start) | |
8571 | { | |
8572 | struct btrfs_path *path; | |
8573 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8574 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8575 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8576 | struct btrfs_key key; |
0af3d00b | 8577 | struct inode *inode; |
1a40e23b | 8578 | int ret; |
10ea00f5 | 8579 | int index; |
89a55897 | 8580 | int factor; |
1a40e23b | 8581 | |
1a40e23b ZY |
8582 | root = root->fs_info->extent_root; |
8583 | ||
8584 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8585 | BUG_ON(!block_group); | |
c146afad | 8586 | BUG_ON(!block_group->ro); |
1a40e23b | 8587 | |
9f7c43c9 | 8588 | /* |
8589 | * Free the reserved super bytes from this block group before | |
8590 | * remove it. | |
8591 | */ | |
8592 | free_excluded_extents(root, block_group); | |
8593 | ||
1a40e23b | 8594 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 8595 | index = get_block_group_index(block_group); |
89a55897 JB |
8596 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8597 | BTRFS_BLOCK_GROUP_RAID1 | | |
8598 | BTRFS_BLOCK_GROUP_RAID10)) | |
8599 | factor = 2; | |
8600 | else | |
8601 | factor = 1; | |
1a40e23b | 8602 | |
44fb5511 CM |
8603 | /* make sure this block group isn't part of an allocation cluster */ |
8604 | cluster = &root->fs_info->data_alloc_cluster; | |
8605 | spin_lock(&cluster->refill_lock); | |
8606 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8607 | spin_unlock(&cluster->refill_lock); | |
8608 | ||
8609 | /* | |
8610 | * make sure this block group isn't part of a metadata | |
8611 | * allocation cluster | |
8612 | */ | |
8613 | cluster = &root->fs_info->meta_alloc_cluster; | |
8614 | spin_lock(&cluster->refill_lock); | |
8615 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8616 | spin_unlock(&cluster->refill_lock); | |
8617 | ||
1a40e23b | 8618 | path = btrfs_alloc_path(); |
d8926bb3 MF |
8619 | if (!path) { |
8620 | ret = -ENOMEM; | |
8621 | goto out; | |
8622 | } | |
1a40e23b | 8623 | |
10b2f34d | 8624 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 8625 | if (!IS_ERR(inode)) { |
b532402e | 8626 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
8627 | if (ret) { |
8628 | btrfs_add_delayed_iput(inode); | |
8629 | goto out; | |
8630 | } | |
0af3d00b JB |
8631 | clear_nlink(inode); |
8632 | /* One for the block groups ref */ | |
8633 | spin_lock(&block_group->lock); | |
8634 | if (block_group->iref) { | |
8635 | block_group->iref = 0; | |
8636 | block_group->inode = NULL; | |
8637 | spin_unlock(&block_group->lock); | |
8638 | iput(inode); | |
8639 | } else { | |
8640 | spin_unlock(&block_group->lock); | |
8641 | } | |
8642 | /* One for our lookup ref */ | |
455757c3 | 8643 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
8644 | } |
8645 | ||
8646 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8647 | key.offset = block_group->key.objectid; | |
8648 | key.type = 0; | |
8649 | ||
8650 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8651 | if (ret < 0) | |
8652 | goto out; | |
8653 | if (ret > 0) | |
b3b4aa74 | 8654 | btrfs_release_path(path); |
0af3d00b JB |
8655 | if (ret == 0) { |
8656 | ret = btrfs_del_item(trans, tree_root, path); | |
8657 | if (ret) | |
8658 | goto out; | |
b3b4aa74 | 8659 | btrfs_release_path(path); |
0af3d00b JB |
8660 | } |
8661 | ||
3dfdb934 | 8662 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8663 | rb_erase(&block_group->cache_node, |
8664 | &root->fs_info->block_group_cache_tree); | |
a1897fdd LB |
8665 | |
8666 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
8667 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 8668 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8669 | |
80eb234a | 8670 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8671 | /* |
8672 | * we must use list_del_init so people can check to see if they | |
8673 | * are still on the list after taking the semaphore | |
8674 | */ | |
8675 | list_del_init(&block_group->list); | |
10ea00f5 ID |
8676 | if (list_empty(&block_group->space_info->block_groups[index])) |
8677 | clear_avail_alloc_bits(root->fs_info, block_group->flags); | |
80eb234a | 8678 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8679 | |
817d52f8 | 8680 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8681 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8682 | |
8683 | btrfs_remove_free_space_cache(block_group); | |
8684 | ||
c146afad YZ |
8685 | spin_lock(&block_group->space_info->lock); |
8686 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8687 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8688 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8689 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8690 | |
0af3d00b JB |
8691 | memcpy(&key, &block_group->key, sizeof(key)); |
8692 | ||
283bb197 | 8693 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8694 | |
fa9c0d79 CM |
8695 | btrfs_put_block_group(block_group); |
8696 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8697 | |
8698 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8699 | if (ret > 0) | |
8700 | ret = -EIO; | |
8701 | if (ret < 0) | |
8702 | goto out; | |
8703 | ||
8704 | ret = btrfs_del_item(trans, root, path); | |
8705 | out: | |
8706 | btrfs_free_path(path); | |
8707 | return ret; | |
8708 | } | |
acce952b | 8709 | |
c59021f8 | 8710 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
8711 | { | |
8712 | struct btrfs_space_info *space_info; | |
1aba86d6 | 8713 | struct btrfs_super_block *disk_super; |
8714 | u64 features; | |
8715 | u64 flags; | |
8716 | int mixed = 0; | |
c59021f8 | 8717 | int ret; |
8718 | ||
6c41761f | 8719 | disk_super = fs_info->super_copy; |
1aba86d6 | 8720 | if (!btrfs_super_root(disk_super)) |
8721 | return 1; | |
c59021f8 | 8722 | |
1aba86d6 | 8723 | features = btrfs_super_incompat_flags(disk_super); |
8724 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
8725 | mixed = 1; | |
c59021f8 | 8726 | |
1aba86d6 | 8727 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
8728 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 8729 | if (ret) |
1aba86d6 | 8730 | goto out; |
c59021f8 | 8731 | |
1aba86d6 | 8732 | if (mixed) { |
8733 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
8734 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8735 | } else { | |
8736 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
8737 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8738 | if (ret) | |
8739 | goto out; | |
8740 | ||
8741 | flags = BTRFS_BLOCK_GROUP_DATA; | |
8742 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8743 | } | |
8744 | out: | |
c59021f8 | 8745 | return ret; |
8746 | } | |
8747 | ||
acce952b | 8748 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
8749 | { | |
8750 | return unpin_extent_range(root, start, end); | |
8751 | } | |
8752 | ||
8753 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 8754 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 8755 | { |
5378e607 | 8756 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 8757 | } |
f7039b1d LD |
8758 | |
8759 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
8760 | { | |
8761 | struct btrfs_fs_info *fs_info = root->fs_info; | |
8762 | struct btrfs_block_group_cache *cache = NULL; | |
8763 | u64 group_trimmed; | |
8764 | u64 start; | |
8765 | u64 end; | |
8766 | u64 trimmed = 0; | |
2cac13e4 | 8767 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
8768 | int ret = 0; |
8769 | ||
2cac13e4 LB |
8770 | /* |
8771 | * try to trim all FS space, our block group may start from non-zero. | |
8772 | */ | |
8773 | if (range->len == total_bytes) | |
8774 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
8775 | else | |
8776 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
8777 | |
8778 | while (cache) { | |
8779 | if (cache->key.objectid >= (range->start + range->len)) { | |
8780 | btrfs_put_block_group(cache); | |
8781 | break; | |
8782 | } | |
8783 | ||
8784 | start = max(range->start, cache->key.objectid); | |
8785 | end = min(range->start + range->len, | |
8786 | cache->key.objectid + cache->key.offset); | |
8787 | ||
8788 | if (end - start >= range->minlen) { | |
8789 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 8790 | ret = cache_block_group(cache, 0); |
1be41b78 JB |
8791 | if (ret) { |
8792 | btrfs_put_block_group(cache); | |
8793 | break; | |
8794 | } | |
8795 | ret = wait_block_group_cache_done(cache); | |
8796 | if (ret) { | |
8797 | btrfs_put_block_group(cache); | |
8798 | break; | |
8799 | } | |
f7039b1d LD |
8800 | } |
8801 | ret = btrfs_trim_block_group(cache, | |
8802 | &group_trimmed, | |
8803 | start, | |
8804 | end, | |
8805 | range->minlen); | |
8806 | ||
8807 | trimmed += group_trimmed; | |
8808 | if (ret) { | |
8809 | btrfs_put_block_group(cache); | |
8810 | break; | |
8811 | } | |
8812 | } | |
8813 | ||
8814 | cache = next_block_group(fs_info->tree_root, cache); | |
8815 | } | |
8816 | ||
8817 | range->len = trimmed; | |
8818 | return ret; | |
8819 | } |