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> |
4b4e25f2 | 26 | #include "compat.h" |
74493f7a | 27 | #include "hash.h" |
fec577fb CM |
28 | #include "ctree.h" |
29 | #include "disk-io.h" | |
30 | #include "print-tree.h" | |
e089f05c | 31 | #include "transaction.h" |
0b86a832 | 32 | #include "volumes.h" |
925baedd | 33 | #include "locking.h" |
fa9c0d79 | 34 | #include "free-space-cache.h" |
fec577fb | 35 | |
f3465ca4 JB |
36 | static int update_block_group(struct btrfs_trans_handle *trans, |
37 | struct btrfs_root *root, | |
f0486c68 YZ |
38 | u64 bytenr, u64 num_bytes, int alloc); |
39 | static int update_reserved_bytes(struct btrfs_block_group_cache *cache, | |
40 | u64 num_bytes, int reserve, int sinfo); | |
5d4f98a2 YZ |
41 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
42 | struct btrfs_root *root, | |
43 | u64 bytenr, u64 num_bytes, u64 parent, | |
44 | u64 root_objectid, u64 owner_objectid, | |
45 | u64 owner_offset, int refs_to_drop, | |
46 | struct btrfs_delayed_extent_op *extra_op); | |
47 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
48 | struct extent_buffer *leaf, | |
49 | struct btrfs_extent_item *ei); | |
50 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
51 | struct btrfs_root *root, | |
52 | u64 parent, u64 root_objectid, | |
53 | u64 flags, u64 owner, u64 offset, | |
54 | struct btrfs_key *ins, int ref_mod); | |
55 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
56 | struct btrfs_root *root, | |
57 | u64 parent, u64 root_objectid, | |
58 | u64 flags, struct btrfs_disk_key *key, | |
59 | int level, struct btrfs_key *ins); | |
6a63209f JB |
60 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
61 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
62 | u64 flags, int force); | |
11833d66 YZ |
63 | static int find_next_key(struct btrfs_path *path, int level, |
64 | struct btrfs_key *key); | |
9ed74f2d JB |
65 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
66 | int dump_block_groups); | |
6a63209f | 67 | |
817d52f8 JB |
68 | static noinline int |
69 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
70 | { | |
71 | smp_mb(); | |
72 | return cache->cached == BTRFS_CACHE_FINISHED; | |
73 | } | |
74 | ||
0f9dd46c JB |
75 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
76 | { | |
77 | return (cache->flags & bits) == bits; | |
78 | } | |
79 | ||
11dfe35a JB |
80 | void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
81 | { | |
82 | atomic_inc(&cache->count); | |
83 | } | |
84 | ||
85 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
86 | { | |
f0486c68 YZ |
87 | if (atomic_dec_and_test(&cache->count)) { |
88 | WARN_ON(cache->pinned > 0); | |
89 | WARN_ON(cache->reserved > 0); | |
90 | WARN_ON(cache->reserved_pinned > 0); | |
11dfe35a | 91 | kfree(cache); |
f0486c68 | 92 | } |
11dfe35a JB |
93 | } |
94 | ||
0f9dd46c JB |
95 | /* |
96 | * this adds the block group to the fs_info rb tree for the block group | |
97 | * cache | |
98 | */ | |
b2950863 | 99 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
100 | struct btrfs_block_group_cache *block_group) |
101 | { | |
102 | struct rb_node **p; | |
103 | struct rb_node *parent = NULL; | |
104 | struct btrfs_block_group_cache *cache; | |
105 | ||
106 | spin_lock(&info->block_group_cache_lock); | |
107 | p = &info->block_group_cache_tree.rb_node; | |
108 | ||
109 | while (*p) { | |
110 | parent = *p; | |
111 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
112 | cache_node); | |
113 | if (block_group->key.objectid < cache->key.objectid) { | |
114 | p = &(*p)->rb_left; | |
115 | } else if (block_group->key.objectid > cache->key.objectid) { | |
116 | p = &(*p)->rb_right; | |
117 | } else { | |
118 | spin_unlock(&info->block_group_cache_lock); | |
119 | return -EEXIST; | |
120 | } | |
121 | } | |
122 | ||
123 | rb_link_node(&block_group->cache_node, parent, p); | |
124 | rb_insert_color(&block_group->cache_node, | |
125 | &info->block_group_cache_tree); | |
126 | spin_unlock(&info->block_group_cache_lock); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | /* | |
132 | * This will return the block group at or after bytenr if contains is 0, else | |
133 | * it will return the block group that contains the bytenr | |
134 | */ | |
135 | static struct btrfs_block_group_cache * | |
136 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
137 | int contains) | |
138 | { | |
139 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
140 | struct rb_node *n; | |
141 | u64 end, start; | |
142 | ||
143 | spin_lock(&info->block_group_cache_lock); | |
144 | n = info->block_group_cache_tree.rb_node; | |
145 | ||
146 | while (n) { | |
147 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
148 | cache_node); | |
149 | end = cache->key.objectid + cache->key.offset - 1; | |
150 | start = cache->key.objectid; | |
151 | ||
152 | if (bytenr < start) { | |
153 | if (!contains && (!ret || start < ret->key.objectid)) | |
154 | ret = cache; | |
155 | n = n->rb_left; | |
156 | } else if (bytenr > start) { | |
157 | if (contains && bytenr <= end) { | |
158 | ret = cache; | |
159 | break; | |
160 | } | |
161 | n = n->rb_right; | |
162 | } else { | |
163 | ret = cache; | |
164 | break; | |
165 | } | |
166 | } | |
d2fb3437 | 167 | if (ret) |
11dfe35a | 168 | btrfs_get_block_group(ret); |
0f9dd46c JB |
169 | spin_unlock(&info->block_group_cache_lock); |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
11833d66 YZ |
174 | static int add_excluded_extent(struct btrfs_root *root, |
175 | u64 start, u64 num_bytes) | |
817d52f8 | 176 | { |
11833d66 YZ |
177 | u64 end = start + num_bytes - 1; |
178 | set_extent_bits(&root->fs_info->freed_extents[0], | |
179 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
180 | set_extent_bits(&root->fs_info->freed_extents[1], | |
181 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
182 | return 0; | |
183 | } | |
817d52f8 | 184 | |
11833d66 YZ |
185 | static void free_excluded_extents(struct btrfs_root *root, |
186 | struct btrfs_block_group_cache *cache) | |
187 | { | |
188 | u64 start, end; | |
817d52f8 | 189 | |
11833d66 YZ |
190 | start = cache->key.objectid; |
191 | end = start + cache->key.offset - 1; | |
192 | ||
193 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
194 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
195 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
196 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
197 | } |
198 | ||
11833d66 YZ |
199 | static int exclude_super_stripes(struct btrfs_root *root, |
200 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 201 | { |
817d52f8 JB |
202 | u64 bytenr; |
203 | u64 *logical; | |
204 | int stripe_len; | |
205 | int i, nr, ret; | |
206 | ||
06b2331f YZ |
207 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
208 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
209 | cache->bytes_super += stripe_len; | |
210 | ret = add_excluded_extent(root, cache->key.objectid, | |
211 | stripe_len); | |
212 | BUG_ON(ret); | |
213 | } | |
214 | ||
817d52f8 JB |
215 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
216 | bytenr = btrfs_sb_offset(i); | |
217 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
218 | cache->key.objectid, bytenr, | |
219 | 0, &logical, &nr, &stripe_len); | |
220 | BUG_ON(ret); | |
11833d66 | 221 | |
817d52f8 | 222 | while (nr--) { |
1b2da372 | 223 | cache->bytes_super += stripe_len; |
11833d66 YZ |
224 | ret = add_excluded_extent(root, logical[nr], |
225 | stripe_len); | |
226 | BUG_ON(ret); | |
817d52f8 | 227 | } |
11833d66 | 228 | |
817d52f8 JB |
229 | kfree(logical); |
230 | } | |
817d52f8 JB |
231 | return 0; |
232 | } | |
233 | ||
11833d66 YZ |
234 | static struct btrfs_caching_control * |
235 | get_caching_control(struct btrfs_block_group_cache *cache) | |
236 | { | |
237 | struct btrfs_caching_control *ctl; | |
238 | ||
239 | spin_lock(&cache->lock); | |
240 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
241 | spin_unlock(&cache->lock); | |
242 | return NULL; | |
243 | } | |
244 | ||
dde5abee JB |
245 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
246 | if (!cache->caching_ctl) { | |
247 | spin_unlock(&cache->lock); | |
11833d66 YZ |
248 | return NULL; |
249 | } | |
250 | ||
251 | ctl = cache->caching_ctl; | |
252 | atomic_inc(&ctl->count); | |
253 | spin_unlock(&cache->lock); | |
254 | return ctl; | |
255 | } | |
256 | ||
257 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
258 | { | |
259 | if (atomic_dec_and_test(&ctl->count)) | |
260 | kfree(ctl); | |
261 | } | |
262 | ||
0f9dd46c JB |
263 | /* |
264 | * this is only called by cache_block_group, since we could have freed extents | |
265 | * we need to check the pinned_extents for any extents that can't be used yet | |
266 | * since their free space will be released as soon as the transaction commits. | |
267 | */ | |
817d52f8 | 268 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
269 | struct btrfs_fs_info *info, u64 start, u64 end) |
270 | { | |
817d52f8 | 271 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
272 | int ret; |
273 | ||
274 | while (start < end) { | |
11833d66 | 275 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 276 | &extent_start, &extent_end, |
11833d66 | 277 | EXTENT_DIRTY | EXTENT_UPTODATE); |
0f9dd46c JB |
278 | if (ret) |
279 | break; | |
280 | ||
06b2331f | 281 | if (extent_start <= start) { |
0f9dd46c JB |
282 | start = extent_end + 1; |
283 | } else if (extent_start > start && extent_start < end) { | |
284 | size = extent_start - start; | |
817d52f8 | 285 | total_added += size; |
ea6a478e JB |
286 | ret = btrfs_add_free_space(block_group, start, |
287 | size); | |
0f9dd46c JB |
288 | BUG_ON(ret); |
289 | start = extent_end + 1; | |
290 | } else { | |
291 | break; | |
292 | } | |
293 | } | |
294 | ||
295 | if (start < end) { | |
296 | size = end - start; | |
817d52f8 | 297 | total_added += size; |
ea6a478e | 298 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
299 | BUG_ON(ret); |
300 | } | |
301 | ||
817d52f8 | 302 | return total_added; |
0f9dd46c JB |
303 | } |
304 | ||
817d52f8 | 305 | static int caching_kthread(void *data) |
e37c9e69 | 306 | { |
817d52f8 JB |
307 | struct btrfs_block_group_cache *block_group = data; |
308 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
11833d66 YZ |
309 | struct btrfs_caching_control *caching_ctl = block_group->caching_ctl; |
310 | struct btrfs_root *extent_root = fs_info->extent_root; | |
e37c9e69 | 311 | struct btrfs_path *path; |
5f39d397 | 312 | struct extent_buffer *leaf; |
11833d66 | 313 | struct btrfs_key key; |
817d52f8 | 314 | u64 total_found = 0; |
11833d66 YZ |
315 | u64 last = 0; |
316 | u32 nritems; | |
317 | int ret = 0; | |
f510cfec | 318 | |
e37c9e69 CM |
319 | path = btrfs_alloc_path(); |
320 | if (!path) | |
321 | return -ENOMEM; | |
7d7d6068 | 322 | |
11833d66 | 323 | exclude_super_stripes(extent_root, block_group); |
1b2da372 | 324 | spin_lock(&block_group->space_info->lock); |
f0486c68 | 325 | block_group->space_info->bytes_readonly += block_group->bytes_super; |
1b2da372 | 326 | spin_unlock(&block_group->space_info->lock); |
11833d66 | 327 | |
817d52f8 | 328 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 329 | |
5cd57b2c | 330 | /* |
817d52f8 JB |
331 | * We don't want to deadlock with somebody trying to allocate a new |
332 | * extent for the extent root while also trying to search the extent | |
333 | * root to add free space. So we skip locking and search the commit | |
334 | * root, since its read-only | |
5cd57b2c CM |
335 | */ |
336 | path->skip_locking = 1; | |
817d52f8 JB |
337 | path->search_commit_root = 1; |
338 | path->reada = 2; | |
339 | ||
e4404d6e | 340 | key.objectid = last; |
e37c9e69 | 341 | key.offset = 0; |
11833d66 | 342 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 343 | again: |
11833d66 | 344 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
345 | /* need to make sure the commit_root doesn't disappear */ |
346 | down_read(&fs_info->extent_commit_sem); | |
347 | ||
11833d66 | 348 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 349 | if (ret < 0) |
ef8bbdfe | 350 | goto err; |
a512bbf8 | 351 | |
11833d66 YZ |
352 | leaf = path->nodes[0]; |
353 | nritems = btrfs_header_nritems(leaf); | |
354 | ||
d397712b | 355 | while (1) { |
817d52f8 | 356 | smp_mb(); |
11833d66 | 357 | if (fs_info->closing > 1) { |
f25784b3 | 358 | last = (u64)-1; |
817d52f8 | 359 | break; |
f25784b3 | 360 | } |
817d52f8 | 361 | |
11833d66 YZ |
362 | if (path->slots[0] < nritems) { |
363 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
364 | } else { | |
365 | ret = find_next_key(path, 0, &key); | |
366 | if (ret) | |
e37c9e69 | 367 | break; |
817d52f8 | 368 | |
11833d66 YZ |
369 | caching_ctl->progress = last; |
370 | btrfs_release_path(extent_root, path); | |
371 | up_read(&fs_info->extent_commit_sem); | |
372 | mutex_unlock(&caching_ctl->mutex); | |
373 | if (btrfs_transaction_in_commit(fs_info)) | |
f36f3042 | 374 | schedule_timeout(1); |
11833d66 YZ |
375 | else |
376 | cond_resched(); | |
377 | goto again; | |
378 | } | |
817d52f8 | 379 | |
11833d66 YZ |
380 | if (key.objectid < block_group->key.objectid) { |
381 | path->slots[0]++; | |
817d52f8 | 382 | continue; |
e37c9e69 | 383 | } |
0f9dd46c | 384 | |
e37c9e69 | 385 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 386 | block_group->key.offset) |
e37c9e69 | 387 | break; |
7d7d6068 | 388 | |
11833d66 | 389 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
390 | total_found += add_new_free_space(block_group, |
391 | fs_info, last, | |
392 | key.objectid); | |
7d7d6068 | 393 | last = key.objectid + key.offset; |
817d52f8 | 394 | |
11833d66 YZ |
395 | if (total_found > (1024 * 1024 * 2)) { |
396 | total_found = 0; | |
397 | wake_up(&caching_ctl->wait); | |
398 | } | |
817d52f8 | 399 | } |
e37c9e69 CM |
400 | path->slots[0]++; |
401 | } | |
817d52f8 | 402 | ret = 0; |
e37c9e69 | 403 | |
817d52f8 JB |
404 | total_found += add_new_free_space(block_group, fs_info, last, |
405 | block_group->key.objectid + | |
406 | block_group->key.offset); | |
11833d66 | 407 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
408 | |
409 | spin_lock(&block_group->lock); | |
11833d66 | 410 | block_group->caching_ctl = NULL; |
817d52f8 JB |
411 | block_group->cached = BTRFS_CACHE_FINISHED; |
412 | spin_unlock(&block_group->lock); | |
0f9dd46c | 413 | |
54aa1f4d | 414 | err: |
e37c9e69 | 415 | btrfs_free_path(path); |
276e680d | 416 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 417 | |
11833d66 YZ |
418 | free_excluded_extents(extent_root, block_group); |
419 | ||
420 | mutex_unlock(&caching_ctl->mutex); | |
421 | wake_up(&caching_ctl->wait); | |
422 | ||
423 | put_caching_control(caching_ctl); | |
424 | atomic_dec(&block_group->space_info->caching_threads); | |
11dfe35a JB |
425 | btrfs_put_block_group(block_group); |
426 | ||
817d52f8 JB |
427 | return 0; |
428 | } | |
429 | ||
9d66e233 JB |
430 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
431 | struct btrfs_trans_handle *trans, | |
432 | int load_cache_only) | |
817d52f8 | 433 | { |
11833d66 YZ |
434 | struct btrfs_fs_info *fs_info = cache->fs_info; |
435 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
436 | struct task_struct *tsk; |
437 | int ret = 0; | |
438 | ||
11833d66 YZ |
439 | smp_mb(); |
440 | if (cache->cached != BTRFS_CACHE_NO) | |
441 | return 0; | |
442 | ||
9d66e233 JB |
443 | /* |
444 | * We can't do the read from on-disk cache during a commit since we need | |
445 | * to have the normal tree locking. | |
446 | */ | |
447 | if (!trans->transaction->in_commit) { | |
448 | spin_lock(&cache->lock); | |
449 | if (cache->cached != BTRFS_CACHE_NO) { | |
450 | spin_unlock(&cache->lock); | |
451 | return 0; | |
452 | } | |
453 | cache->cached = BTRFS_CACHE_STARTED; | |
454 | spin_unlock(&cache->lock); | |
455 | ||
456 | ret = load_free_space_cache(fs_info, cache); | |
457 | ||
458 | spin_lock(&cache->lock); | |
459 | if (ret == 1) { | |
460 | cache->cached = BTRFS_CACHE_FINISHED; | |
461 | cache->last_byte_to_unpin = (u64)-1; | |
462 | } else { | |
463 | cache->cached = BTRFS_CACHE_NO; | |
464 | } | |
465 | spin_unlock(&cache->lock); | |
466 | if (ret == 1) | |
467 | return 0; | |
468 | } | |
469 | ||
470 | if (load_cache_only) | |
471 | return 0; | |
472 | ||
11833d66 YZ |
473 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_KERNEL); |
474 | BUG_ON(!caching_ctl); | |
475 | ||
476 | INIT_LIST_HEAD(&caching_ctl->list); | |
477 | mutex_init(&caching_ctl->mutex); | |
478 | init_waitqueue_head(&caching_ctl->wait); | |
479 | caching_ctl->block_group = cache; | |
480 | caching_ctl->progress = cache->key.objectid; | |
481 | /* one for caching kthread, one for caching block group list */ | |
482 | atomic_set(&caching_ctl->count, 2); | |
483 | ||
817d52f8 JB |
484 | spin_lock(&cache->lock); |
485 | if (cache->cached != BTRFS_CACHE_NO) { | |
486 | spin_unlock(&cache->lock); | |
11833d66 YZ |
487 | kfree(caching_ctl); |
488 | return 0; | |
817d52f8 | 489 | } |
11833d66 | 490 | cache->caching_ctl = caching_ctl; |
817d52f8 JB |
491 | cache->cached = BTRFS_CACHE_STARTED; |
492 | spin_unlock(&cache->lock); | |
493 | ||
11833d66 YZ |
494 | down_write(&fs_info->extent_commit_sem); |
495 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); | |
496 | up_write(&fs_info->extent_commit_sem); | |
497 | ||
498 | atomic_inc(&cache->space_info->caching_threads); | |
11dfe35a | 499 | btrfs_get_block_group(cache); |
11833d66 | 500 | |
817d52f8 JB |
501 | tsk = kthread_run(caching_kthread, cache, "btrfs-cache-%llu\n", |
502 | cache->key.objectid); | |
503 | if (IS_ERR(tsk)) { | |
504 | ret = PTR_ERR(tsk); | |
505 | printk(KERN_ERR "error running thread %d\n", ret); | |
506 | BUG(); | |
507 | } | |
508 | ||
ef8bbdfe | 509 | return ret; |
e37c9e69 CM |
510 | } |
511 | ||
0f9dd46c JB |
512 | /* |
513 | * return the block group that starts at or after bytenr | |
514 | */ | |
d397712b CM |
515 | static struct btrfs_block_group_cache * |
516 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 517 | { |
0f9dd46c | 518 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 519 | |
0f9dd46c | 520 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 521 | |
0f9dd46c | 522 | return cache; |
0ef3e66b CM |
523 | } |
524 | ||
0f9dd46c | 525 | /* |
9f55684c | 526 | * return the block group that contains the given bytenr |
0f9dd46c | 527 | */ |
d397712b CM |
528 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
529 | struct btrfs_fs_info *info, | |
530 | u64 bytenr) | |
be744175 | 531 | { |
0f9dd46c | 532 | struct btrfs_block_group_cache *cache; |
be744175 | 533 | |
0f9dd46c | 534 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 535 | |
0f9dd46c | 536 | return cache; |
be744175 | 537 | } |
0b86a832 | 538 | |
0f9dd46c JB |
539 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
540 | u64 flags) | |
6324fbf3 | 541 | { |
0f9dd46c | 542 | struct list_head *head = &info->space_info; |
0f9dd46c | 543 | struct btrfs_space_info *found; |
4184ea7f | 544 | |
b742bb82 YZ |
545 | flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM | |
546 | BTRFS_BLOCK_GROUP_METADATA; | |
547 | ||
4184ea7f CM |
548 | rcu_read_lock(); |
549 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 550 | if (found->flags & flags) { |
4184ea7f | 551 | rcu_read_unlock(); |
0f9dd46c | 552 | return found; |
4184ea7f | 553 | } |
0f9dd46c | 554 | } |
4184ea7f | 555 | rcu_read_unlock(); |
0f9dd46c | 556 | return NULL; |
6324fbf3 CM |
557 | } |
558 | ||
4184ea7f CM |
559 | /* |
560 | * after adding space to the filesystem, we need to clear the full flags | |
561 | * on all the space infos. | |
562 | */ | |
563 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
564 | { | |
565 | struct list_head *head = &info->space_info; | |
566 | struct btrfs_space_info *found; | |
567 | ||
568 | rcu_read_lock(); | |
569 | list_for_each_entry_rcu(found, head, list) | |
570 | found->full = 0; | |
571 | rcu_read_unlock(); | |
572 | } | |
573 | ||
80eb234a JB |
574 | static u64 div_factor(u64 num, int factor) |
575 | { | |
576 | if (factor == 10) | |
577 | return num; | |
578 | num *= factor; | |
579 | do_div(num, 10); | |
580 | return num; | |
581 | } | |
582 | ||
e5bc2458 CM |
583 | static u64 div_factor_fine(u64 num, int factor) |
584 | { | |
585 | if (factor == 100) | |
586 | return num; | |
587 | num *= factor; | |
588 | do_div(num, 100); | |
589 | return num; | |
590 | } | |
591 | ||
d2fb3437 YZ |
592 | u64 btrfs_find_block_group(struct btrfs_root *root, |
593 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 594 | { |
96b5179d | 595 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 596 | u64 used; |
d2fb3437 YZ |
597 | u64 last = max(search_hint, search_start); |
598 | u64 group_start = 0; | |
31f3c99b | 599 | int full_search = 0; |
d2fb3437 | 600 | int factor = 9; |
0ef3e66b | 601 | int wrapped = 0; |
31f3c99b | 602 | again: |
e8569813 ZY |
603 | while (1) { |
604 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
605 | if (!cache) |
606 | break; | |
96b5179d | 607 | |
c286ac48 | 608 | spin_lock(&cache->lock); |
96b5179d CM |
609 | last = cache->key.objectid + cache->key.offset; |
610 | used = btrfs_block_group_used(&cache->item); | |
611 | ||
d2fb3437 YZ |
612 | if ((full_search || !cache->ro) && |
613 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 614 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
615 | div_factor(cache->key.offset, factor)) { |
616 | group_start = cache->key.objectid; | |
c286ac48 | 617 | spin_unlock(&cache->lock); |
fa9c0d79 | 618 | btrfs_put_block_group(cache); |
8790d502 CM |
619 | goto found; |
620 | } | |
6324fbf3 | 621 | } |
c286ac48 | 622 | spin_unlock(&cache->lock); |
fa9c0d79 | 623 | btrfs_put_block_group(cache); |
de428b63 | 624 | cond_resched(); |
cd1bc465 | 625 | } |
0ef3e66b CM |
626 | if (!wrapped) { |
627 | last = search_start; | |
628 | wrapped = 1; | |
629 | goto again; | |
630 | } | |
631 | if (!full_search && factor < 10) { | |
be744175 | 632 | last = search_start; |
31f3c99b | 633 | full_search = 1; |
0ef3e66b | 634 | factor = 10; |
31f3c99b CM |
635 | goto again; |
636 | } | |
be744175 | 637 | found: |
d2fb3437 | 638 | return group_start; |
925baedd | 639 | } |
0f9dd46c | 640 | |
e02119d5 | 641 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 642 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
643 | { |
644 | int ret; | |
645 | struct btrfs_key key; | |
31840ae1 | 646 | struct btrfs_path *path; |
e02119d5 | 647 | |
31840ae1 ZY |
648 | path = btrfs_alloc_path(); |
649 | BUG_ON(!path); | |
e02119d5 CM |
650 | key.objectid = start; |
651 | key.offset = len; | |
652 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
653 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
654 | 0, 0); | |
31840ae1 | 655 | btrfs_free_path(path); |
7bb86316 CM |
656 | return ret; |
657 | } | |
658 | ||
a22285a6 YZ |
659 | /* |
660 | * helper function to lookup reference count and flags of extent. | |
661 | * | |
662 | * the head node for delayed ref is used to store the sum of all the | |
663 | * reference count modifications queued up in the rbtree. the head | |
664 | * node may also store the extent flags to set. This way you can check | |
665 | * to see what the reference count and extent flags would be if all of | |
666 | * the delayed refs are not processed. | |
667 | */ | |
668 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
669 | struct btrfs_root *root, u64 bytenr, | |
670 | u64 num_bytes, u64 *refs, u64 *flags) | |
671 | { | |
672 | struct btrfs_delayed_ref_head *head; | |
673 | struct btrfs_delayed_ref_root *delayed_refs; | |
674 | struct btrfs_path *path; | |
675 | struct btrfs_extent_item *ei; | |
676 | struct extent_buffer *leaf; | |
677 | struct btrfs_key key; | |
678 | u32 item_size; | |
679 | u64 num_refs; | |
680 | u64 extent_flags; | |
681 | int ret; | |
682 | ||
683 | path = btrfs_alloc_path(); | |
684 | if (!path) | |
685 | return -ENOMEM; | |
686 | ||
687 | key.objectid = bytenr; | |
688 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
689 | key.offset = num_bytes; | |
690 | if (!trans) { | |
691 | path->skip_locking = 1; | |
692 | path->search_commit_root = 1; | |
693 | } | |
694 | again: | |
695 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
696 | &key, path, 0, 0); | |
697 | if (ret < 0) | |
698 | goto out_free; | |
699 | ||
700 | if (ret == 0) { | |
701 | leaf = path->nodes[0]; | |
702 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
703 | if (item_size >= sizeof(*ei)) { | |
704 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
705 | struct btrfs_extent_item); | |
706 | num_refs = btrfs_extent_refs(leaf, ei); | |
707 | extent_flags = btrfs_extent_flags(leaf, ei); | |
708 | } else { | |
709 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
710 | struct btrfs_extent_item_v0 *ei0; | |
711 | BUG_ON(item_size != sizeof(*ei0)); | |
712 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
713 | struct btrfs_extent_item_v0); | |
714 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
715 | /* FIXME: this isn't correct for data */ | |
716 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
717 | #else | |
718 | BUG(); | |
719 | #endif | |
720 | } | |
721 | BUG_ON(num_refs == 0); | |
722 | } else { | |
723 | num_refs = 0; | |
724 | extent_flags = 0; | |
725 | ret = 0; | |
726 | } | |
727 | ||
728 | if (!trans) | |
729 | goto out; | |
730 | ||
731 | delayed_refs = &trans->transaction->delayed_refs; | |
732 | spin_lock(&delayed_refs->lock); | |
733 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
734 | if (head) { | |
735 | if (!mutex_trylock(&head->mutex)) { | |
736 | atomic_inc(&head->node.refs); | |
737 | spin_unlock(&delayed_refs->lock); | |
738 | ||
739 | btrfs_release_path(root->fs_info->extent_root, path); | |
740 | ||
741 | mutex_lock(&head->mutex); | |
742 | mutex_unlock(&head->mutex); | |
743 | btrfs_put_delayed_ref(&head->node); | |
744 | goto again; | |
745 | } | |
746 | if (head->extent_op && head->extent_op->update_flags) | |
747 | extent_flags |= head->extent_op->flags_to_set; | |
748 | else | |
749 | BUG_ON(num_refs == 0); | |
750 | ||
751 | num_refs += head->node.ref_mod; | |
752 | mutex_unlock(&head->mutex); | |
753 | } | |
754 | spin_unlock(&delayed_refs->lock); | |
755 | out: | |
756 | WARN_ON(num_refs == 0); | |
757 | if (refs) | |
758 | *refs = num_refs; | |
759 | if (flags) | |
760 | *flags = extent_flags; | |
761 | out_free: | |
762 | btrfs_free_path(path); | |
763 | return ret; | |
764 | } | |
765 | ||
d8d5f3e1 CM |
766 | /* |
767 | * Back reference rules. Back refs have three main goals: | |
768 | * | |
769 | * 1) differentiate between all holders of references to an extent so that | |
770 | * when a reference is dropped we can make sure it was a valid reference | |
771 | * before freeing the extent. | |
772 | * | |
773 | * 2) Provide enough information to quickly find the holders of an extent | |
774 | * if we notice a given block is corrupted or bad. | |
775 | * | |
776 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
777 | * maintenance. This is actually the same as #2, but with a slightly | |
778 | * different use case. | |
779 | * | |
5d4f98a2 YZ |
780 | * There are two kinds of back refs. The implicit back refs is optimized |
781 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
782 | * back refs of this kind provide information about the block's owner tree | |
783 | * and the pointer's key. These information allow us to find the block by | |
784 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
785 | * referenced by their owner trees. The location of tree block is recorded | |
786 | * in the back refs. Actually the full back refs is generic, and can be | |
787 | * used in all cases the implicit back refs is used. The major shortcoming | |
788 | * of the full back refs is its overhead. Every time a tree block gets | |
789 | * COWed, we have to update back refs entry for all pointers in it. | |
790 | * | |
791 | * For a newly allocated tree block, we use implicit back refs for | |
792 | * pointers in it. This means most tree related operations only involve | |
793 | * implicit back refs. For a tree block created in old transaction, the | |
794 | * only way to drop a reference to it is COW it. So we can detect the | |
795 | * event that tree block loses its owner tree's reference and do the | |
796 | * back refs conversion. | |
797 | * | |
798 | * When a tree block is COW'd through a tree, there are four cases: | |
799 | * | |
800 | * The reference count of the block is one and the tree is the block's | |
801 | * owner tree. Nothing to do in this case. | |
802 | * | |
803 | * The reference count of the block is one and the tree is not the | |
804 | * block's owner tree. In this case, full back refs is used for pointers | |
805 | * in the block. Remove these full back refs, add implicit back refs for | |
806 | * every pointers in the new block. | |
807 | * | |
808 | * The reference count of the block is greater than one and the tree is | |
809 | * the block's owner tree. In this case, implicit back refs is used for | |
810 | * pointers in the block. Add full back refs for every pointers in the | |
811 | * block, increase lower level extents' reference counts. The original | |
812 | * implicit back refs are entailed to the new block. | |
813 | * | |
814 | * The reference count of the block is greater than one and the tree is | |
815 | * not the block's owner tree. Add implicit back refs for every pointer in | |
816 | * the new block, increase lower level extents' reference count. | |
817 | * | |
818 | * Back Reference Key composing: | |
819 | * | |
820 | * The key objectid corresponds to the first byte in the extent, | |
821 | * The key type is used to differentiate between types of back refs. | |
822 | * There are different meanings of the key offset for different types | |
823 | * of back refs. | |
824 | * | |
d8d5f3e1 CM |
825 | * File extents can be referenced by: |
826 | * | |
827 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 828 | * - different files inside a single subvolume |
d8d5f3e1 CM |
829 | * - different offsets inside a file (bookend extents in file.c) |
830 | * | |
5d4f98a2 | 831 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
832 | * |
833 | * - Objectid of the subvolume root | |
d8d5f3e1 | 834 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
835 | * - original offset in the file |
836 | * - how many bookend extents | |
d8d5f3e1 | 837 | * |
5d4f98a2 YZ |
838 | * The key offset for the implicit back refs is hash of the first |
839 | * three fields. | |
d8d5f3e1 | 840 | * |
5d4f98a2 | 841 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 842 | * |
5d4f98a2 | 843 | * - number of pointers in the tree leaf |
d8d5f3e1 | 844 | * |
5d4f98a2 YZ |
845 | * The key offset for the implicit back refs is the first byte of |
846 | * the tree leaf | |
d8d5f3e1 | 847 | * |
5d4f98a2 YZ |
848 | * When a file extent is allocated, The implicit back refs is used. |
849 | * the fields are filled in: | |
d8d5f3e1 | 850 | * |
5d4f98a2 | 851 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 852 | * |
5d4f98a2 YZ |
853 | * When a file extent is removed file truncation, we find the |
854 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 855 | * |
5d4f98a2 | 856 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 857 | * |
5d4f98a2 | 858 | * Btree extents can be referenced by: |
d8d5f3e1 | 859 | * |
5d4f98a2 | 860 | * - Different subvolumes |
d8d5f3e1 | 861 | * |
5d4f98a2 YZ |
862 | * Both the implicit back refs and the full back refs for tree blocks |
863 | * only consist of key. The key offset for the implicit back refs is | |
864 | * objectid of block's owner tree. The key offset for the full back refs | |
865 | * is the first byte of parent block. | |
d8d5f3e1 | 866 | * |
5d4f98a2 YZ |
867 | * When implicit back refs is used, information about the lowest key and |
868 | * level of the tree block are required. These information are stored in | |
869 | * tree block info structure. | |
d8d5f3e1 | 870 | */ |
31840ae1 | 871 | |
5d4f98a2 YZ |
872 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
873 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
874 | struct btrfs_root *root, | |
875 | struct btrfs_path *path, | |
876 | u64 owner, u32 extra_size) | |
7bb86316 | 877 | { |
5d4f98a2 YZ |
878 | struct btrfs_extent_item *item; |
879 | struct btrfs_extent_item_v0 *ei0; | |
880 | struct btrfs_extent_ref_v0 *ref0; | |
881 | struct btrfs_tree_block_info *bi; | |
882 | struct extent_buffer *leaf; | |
7bb86316 | 883 | struct btrfs_key key; |
5d4f98a2 YZ |
884 | struct btrfs_key found_key; |
885 | u32 new_size = sizeof(*item); | |
886 | u64 refs; | |
887 | int ret; | |
888 | ||
889 | leaf = path->nodes[0]; | |
890 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
891 | ||
892 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
893 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
894 | struct btrfs_extent_item_v0); | |
895 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
896 | ||
897 | if (owner == (u64)-1) { | |
898 | while (1) { | |
899 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
900 | ret = btrfs_next_leaf(root, path); | |
901 | if (ret < 0) | |
902 | return ret; | |
903 | BUG_ON(ret > 0); | |
904 | leaf = path->nodes[0]; | |
905 | } | |
906 | btrfs_item_key_to_cpu(leaf, &found_key, | |
907 | path->slots[0]); | |
908 | BUG_ON(key.objectid != found_key.objectid); | |
909 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
910 | path->slots[0]++; | |
911 | continue; | |
912 | } | |
913 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
914 | struct btrfs_extent_ref_v0); | |
915 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
916 | break; | |
917 | } | |
918 | } | |
919 | btrfs_release_path(root, path); | |
920 | ||
921 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
922 | new_size += sizeof(*bi); | |
923 | ||
924 | new_size -= sizeof(*ei0); | |
925 | ret = btrfs_search_slot(trans, root, &key, path, | |
926 | new_size + extra_size, 1); | |
927 | if (ret < 0) | |
928 | return ret; | |
929 | BUG_ON(ret); | |
930 | ||
931 | ret = btrfs_extend_item(trans, root, path, new_size); | |
932 | BUG_ON(ret); | |
933 | ||
934 | leaf = path->nodes[0]; | |
935 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
936 | btrfs_set_extent_refs(leaf, item, refs); | |
937 | /* FIXME: get real generation */ | |
938 | btrfs_set_extent_generation(leaf, item, 0); | |
939 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
940 | btrfs_set_extent_flags(leaf, item, | |
941 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
942 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
943 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
944 | /* FIXME: get first key of the block */ | |
945 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
946 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
947 | } else { | |
948 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
949 | } | |
950 | btrfs_mark_buffer_dirty(leaf); | |
951 | return 0; | |
952 | } | |
953 | #endif | |
954 | ||
955 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
956 | { | |
957 | u32 high_crc = ~(u32)0; | |
958 | u32 low_crc = ~(u32)0; | |
959 | __le64 lenum; | |
960 | ||
961 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 962 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 963 | lenum = cpu_to_le64(owner); |
163e783e | 964 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 965 | lenum = cpu_to_le64(offset); |
163e783e | 966 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
967 | |
968 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
969 | } | |
970 | ||
971 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
972 | struct btrfs_extent_data_ref *ref) | |
973 | { | |
974 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
975 | btrfs_extent_data_ref_objectid(leaf, ref), | |
976 | btrfs_extent_data_ref_offset(leaf, ref)); | |
977 | } | |
978 | ||
979 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
980 | struct btrfs_extent_data_ref *ref, | |
981 | u64 root_objectid, u64 owner, u64 offset) | |
982 | { | |
983 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
984 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
985 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
986 | return 0; | |
987 | return 1; | |
988 | } | |
989 | ||
990 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
991 | struct btrfs_root *root, | |
992 | struct btrfs_path *path, | |
993 | u64 bytenr, u64 parent, | |
994 | u64 root_objectid, | |
995 | u64 owner, u64 offset) | |
996 | { | |
997 | struct btrfs_key key; | |
998 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 999 | struct extent_buffer *leaf; |
5d4f98a2 | 1000 | u32 nritems; |
74493f7a | 1001 | int ret; |
5d4f98a2 YZ |
1002 | int recow; |
1003 | int err = -ENOENT; | |
74493f7a | 1004 | |
31840ae1 | 1005 | key.objectid = bytenr; |
5d4f98a2 YZ |
1006 | if (parent) { |
1007 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1008 | key.offset = parent; | |
1009 | } else { | |
1010 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1011 | key.offset = hash_extent_data_ref(root_objectid, | |
1012 | owner, offset); | |
1013 | } | |
1014 | again: | |
1015 | recow = 0; | |
1016 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1017 | if (ret < 0) { | |
1018 | err = ret; | |
1019 | goto fail; | |
1020 | } | |
31840ae1 | 1021 | |
5d4f98a2 YZ |
1022 | if (parent) { |
1023 | if (!ret) | |
1024 | return 0; | |
1025 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1026 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1027 | btrfs_release_path(root, path); | |
1028 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1029 | if (ret < 0) { | |
1030 | err = ret; | |
1031 | goto fail; | |
1032 | } | |
1033 | if (!ret) | |
1034 | return 0; | |
1035 | #endif | |
1036 | goto fail; | |
31840ae1 ZY |
1037 | } |
1038 | ||
1039 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1040 | nritems = btrfs_header_nritems(leaf); |
1041 | while (1) { | |
1042 | if (path->slots[0] >= nritems) { | |
1043 | ret = btrfs_next_leaf(root, path); | |
1044 | if (ret < 0) | |
1045 | err = ret; | |
1046 | if (ret) | |
1047 | goto fail; | |
1048 | ||
1049 | leaf = path->nodes[0]; | |
1050 | nritems = btrfs_header_nritems(leaf); | |
1051 | recow = 1; | |
1052 | } | |
1053 | ||
1054 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1055 | if (key.objectid != bytenr || | |
1056 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1057 | goto fail; | |
1058 | ||
1059 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1060 | struct btrfs_extent_data_ref); | |
1061 | ||
1062 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1063 | owner, offset)) { | |
1064 | if (recow) { | |
1065 | btrfs_release_path(root, path); | |
1066 | goto again; | |
1067 | } | |
1068 | err = 0; | |
1069 | break; | |
1070 | } | |
1071 | path->slots[0]++; | |
31840ae1 | 1072 | } |
5d4f98a2 YZ |
1073 | fail: |
1074 | return err; | |
31840ae1 ZY |
1075 | } |
1076 | ||
5d4f98a2 YZ |
1077 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1078 | struct btrfs_root *root, | |
1079 | struct btrfs_path *path, | |
1080 | u64 bytenr, u64 parent, | |
1081 | u64 root_objectid, u64 owner, | |
1082 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1083 | { |
1084 | struct btrfs_key key; | |
1085 | struct extent_buffer *leaf; | |
5d4f98a2 | 1086 | u32 size; |
31840ae1 ZY |
1087 | u32 num_refs; |
1088 | int ret; | |
74493f7a | 1089 | |
74493f7a | 1090 | key.objectid = bytenr; |
5d4f98a2 YZ |
1091 | if (parent) { |
1092 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1093 | key.offset = parent; | |
1094 | size = sizeof(struct btrfs_shared_data_ref); | |
1095 | } else { | |
1096 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1097 | key.offset = hash_extent_data_ref(root_objectid, | |
1098 | owner, offset); | |
1099 | size = sizeof(struct btrfs_extent_data_ref); | |
1100 | } | |
74493f7a | 1101 | |
5d4f98a2 YZ |
1102 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1103 | if (ret && ret != -EEXIST) | |
1104 | goto fail; | |
1105 | ||
1106 | leaf = path->nodes[0]; | |
1107 | if (parent) { | |
1108 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1109 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1110 | struct btrfs_shared_data_ref); |
1111 | if (ret == 0) { | |
1112 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1113 | } else { | |
1114 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1115 | num_refs += refs_to_add; | |
1116 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1117 | } |
5d4f98a2 YZ |
1118 | } else { |
1119 | struct btrfs_extent_data_ref *ref; | |
1120 | while (ret == -EEXIST) { | |
1121 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1122 | struct btrfs_extent_data_ref); | |
1123 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1124 | owner, offset)) | |
1125 | break; | |
1126 | btrfs_release_path(root, path); | |
1127 | key.offset++; | |
1128 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1129 | size); | |
1130 | if (ret && ret != -EEXIST) | |
1131 | goto fail; | |
31840ae1 | 1132 | |
5d4f98a2 YZ |
1133 | leaf = path->nodes[0]; |
1134 | } | |
1135 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1136 | struct btrfs_extent_data_ref); | |
1137 | if (ret == 0) { | |
1138 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1139 | root_objectid); | |
1140 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1141 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1142 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1143 | } else { | |
1144 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1145 | num_refs += refs_to_add; | |
1146 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1147 | } |
31840ae1 | 1148 | } |
5d4f98a2 YZ |
1149 | btrfs_mark_buffer_dirty(leaf); |
1150 | ret = 0; | |
1151 | fail: | |
7bb86316 CM |
1152 | btrfs_release_path(root, path); |
1153 | return ret; | |
74493f7a CM |
1154 | } |
1155 | ||
5d4f98a2 YZ |
1156 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1157 | struct btrfs_root *root, | |
1158 | struct btrfs_path *path, | |
1159 | int refs_to_drop) | |
31840ae1 | 1160 | { |
5d4f98a2 YZ |
1161 | struct btrfs_key key; |
1162 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1163 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1164 | struct extent_buffer *leaf; |
5d4f98a2 | 1165 | u32 num_refs = 0; |
31840ae1 ZY |
1166 | int ret = 0; |
1167 | ||
1168 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1169 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1170 | ||
1171 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1172 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1173 | struct btrfs_extent_data_ref); | |
1174 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1175 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1176 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1177 | struct btrfs_shared_data_ref); | |
1178 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1179 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1180 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1181 | struct btrfs_extent_ref_v0 *ref0; | |
1182 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1183 | struct btrfs_extent_ref_v0); | |
1184 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1185 | #endif | |
1186 | } else { | |
1187 | BUG(); | |
1188 | } | |
1189 | ||
56bec294 CM |
1190 | BUG_ON(num_refs < refs_to_drop); |
1191 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1192 | |
31840ae1 ZY |
1193 | if (num_refs == 0) { |
1194 | ret = btrfs_del_item(trans, root, path); | |
1195 | } else { | |
5d4f98a2 YZ |
1196 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1197 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1198 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1199 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1200 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1201 | else { | |
1202 | struct btrfs_extent_ref_v0 *ref0; | |
1203 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1204 | struct btrfs_extent_ref_v0); | |
1205 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1206 | } | |
1207 | #endif | |
31840ae1 ZY |
1208 | btrfs_mark_buffer_dirty(leaf); |
1209 | } | |
31840ae1 ZY |
1210 | return ret; |
1211 | } | |
1212 | ||
5d4f98a2 YZ |
1213 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1214 | struct btrfs_path *path, | |
1215 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1216 | { |
5d4f98a2 YZ |
1217 | struct btrfs_key key; |
1218 | struct extent_buffer *leaf; | |
1219 | struct btrfs_extent_data_ref *ref1; | |
1220 | struct btrfs_shared_data_ref *ref2; | |
1221 | u32 num_refs = 0; | |
1222 | ||
1223 | leaf = path->nodes[0]; | |
1224 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1225 | if (iref) { | |
1226 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1227 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1228 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1229 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1230 | } else { | |
1231 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1232 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1233 | } | |
1234 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1235 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1236 | struct btrfs_extent_data_ref); | |
1237 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1238 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1239 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1240 | struct btrfs_shared_data_ref); | |
1241 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1242 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1243 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1244 | struct btrfs_extent_ref_v0 *ref0; | |
1245 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1246 | struct btrfs_extent_ref_v0); | |
1247 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1248 | #endif |
5d4f98a2 YZ |
1249 | } else { |
1250 | WARN_ON(1); | |
1251 | } | |
1252 | return num_refs; | |
1253 | } | |
15916de8 | 1254 | |
5d4f98a2 YZ |
1255 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1256 | struct btrfs_root *root, | |
1257 | struct btrfs_path *path, | |
1258 | u64 bytenr, u64 parent, | |
1259 | u64 root_objectid) | |
1f3c79a2 | 1260 | { |
5d4f98a2 | 1261 | struct btrfs_key key; |
1f3c79a2 | 1262 | int ret; |
1f3c79a2 | 1263 | |
5d4f98a2 YZ |
1264 | key.objectid = bytenr; |
1265 | if (parent) { | |
1266 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1267 | key.offset = parent; | |
1268 | } else { | |
1269 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1270 | key.offset = root_objectid; | |
1f3c79a2 LH |
1271 | } |
1272 | ||
5d4f98a2 YZ |
1273 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1274 | if (ret > 0) | |
1275 | ret = -ENOENT; | |
1276 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1277 | if (ret == -ENOENT && parent) { | |
1278 | btrfs_release_path(root, path); | |
1279 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1280 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1281 | if (ret > 0) | |
1282 | ret = -ENOENT; | |
1283 | } | |
1f3c79a2 | 1284 | #endif |
5d4f98a2 | 1285 | return ret; |
1f3c79a2 LH |
1286 | } |
1287 | ||
5d4f98a2 YZ |
1288 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1289 | struct btrfs_root *root, | |
1290 | struct btrfs_path *path, | |
1291 | u64 bytenr, u64 parent, | |
1292 | u64 root_objectid) | |
31840ae1 | 1293 | { |
5d4f98a2 | 1294 | struct btrfs_key key; |
31840ae1 | 1295 | int ret; |
31840ae1 | 1296 | |
5d4f98a2 YZ |
1297 | key.objectid = bytenr; |
1298 | if (parent) { | |
1299 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1300 | key.offset = parent; | |
1301 | } else { | |
1302 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1303 | key.offset = root_objectid; | |
1304 | } | |
1305 | ||
1306 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1307 | btrfs_release_path(root, path); | |
31840ae1 ZY |
1308 | return ret; |
1309 | } | |
1310 | ||
5d4f98a2 | 1311 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1312 | { |
5d4f98a2 YZ |
1313 | int type; |
1314 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1315 | if (parent > 0) | |
1316 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1317 | else | |
1318 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1319 | } else { | |
1320 | if (parent > 0) | |
1321 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1322 | else | |
1323 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1324 | } | |
1325 | return type; | |
31840ae1 | 1326 | } |
56bec294 | 1327 | |
2c47e605 YZ |
1328 | static int find_next_key(struct btrfs_path *path, int level, |
1329 | struct btrfs_key *key) | |
56bec294 | 1330 | |
02217ed2 | 1331 | { |
2c47e605 | 1332 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1333 | if (!path->nodes[level]) |
1334 | break; | |
5d4f98a2 YZ |
1335 | if (path->slots[level] + 1 >= |
1336 | btrfs_header_nritems(path->nodes[level])) | |
1337 | continue; | |
1338 | if (level == 0) | |
1339 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1340 | path->slots[level] + 1); | |
1341 | else | |
1342 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1343 | path->slots[level] + 1); | |
1344 | return 0; | |
1345 | } | |
1346 | return 1; | |
1347 | } | |
037e6390 | 1348 | |
5d4f98a2 YZ |
1349 | /* |
1350 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1351 | * to the address of inline back ref, and 0 is returned. | |
1352 | * | |
1353 | * if back ref isn't found, *ref_ret is set to the address where it | |
1354 | * should be inserted, and -ENOENT is returned. | |
1355 | * | |
1356 | * if insert is true and there are too many inline back refs, the path | |
1357 | * points to the extent item, and -EAGAIN is returned. | |
1358 | * | |
1359 | * NOTE: inline back refs are ordered in the same way that back ref | |
1360 | * items in the tree are ordered. | |
1361 | */ | |
1362 | static noinline_for_stack | |
1363 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1364 | struct btrfs_root *root, | |
1365 | struct btrfs_path *path, | |
1366 | struct btrfs_extent_inline_ref **ref_ret, | |
1367 | u64 bytenr, u64 num_bytes, | |
1368 | u64 parent, u64 root_objectid, | |
1369 | u64 owner, u64 offset, int insert) | |
1370 | { | |
1371 | struct btrfs_key key; | |
1372 | struct extent_buffer *leaf; | |
1373 | struct btrfs_extent_item *ei; | |
1374 | struct btrfs_extent_inline_ref *iref; | |
1375 | u64 flags; | |
1376 | u64 item_size; | |
1377 | unsigned long ptr; | |
1378 | unsigned long end; | |
1379 | int extra_size; | |
1380 | int type; | |
1381 | int want; | |
1382 | int ret; | |
1383 | int err = 0; | |
26b8003f | 1384 | |
db94535d | 1385 | key.objectid = bytenr; |
31840ae1 | 1386 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1387 | key.offset = num_bytes; |
31840ae1 | 1388 | |
5d4f98a2 YZ |
1389 | want = extent_ref_type(parent, owner); |
1390 | if (insert) { | |
1391 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1392 | path->keep_locks = 1; |
5d4f98a2 YZ |
1393 | } else |
1394 | extra_size = -1; | |
1395 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1396 | if (ret < 0) { |
5d4f98a2 YZ |
1397 | err = ret; |
1398 | goto out; | |
1399 | } | |
1400 | BUG_ON(ret); | |
1401 | ||
1402 | leaf = path->nodes[0]; | |
1403 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1404 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1405 | if (item_size < sizeof(*ei)) { | |
1406 | if (!insert) { | |
1407 | err = -ENOENT; | |
1408 | goto out; | |
1409 | } | |
1410 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1411 | extra_size); | |
1412 | if (ret < 0) { | |
1413 | err = ret; | |
1414 | goto out; | |
1415 | } | |
1416 | leaf = path->nodes[0]; | |
1417 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1418 | } | |
1419 | #endif | |
1420 | BUG_ON(item_size < sizeof(*ei)); | |
1421 | ||
5d4f98a2 YZ |
1422 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1423 | flags = btrfs_extent_flags(leaf, ei); | |
1424 | ||
1425 | ptr = (unsigned long)(ei + 1); | |
1426 | end = (unsigned long)ei + item_size; | |
1427 | ||
1428 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1429 | ptr += sizeof(struct btrfs_tree_block_info); | |
1430 | BUG_ON(ptr > end); | |
1431 | } else { | |
1432 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1433 | } | |
1434 | ||
1435 | err = -ENOENT; | |
1436 | while (1) { | |
1437 | if (ptr >= end) { | |
1438 | WARN_ON(ptr > end); | |
1439 | break; | |
1440 | } | |
1441 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1442 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1443 | if (want < type) | |
1444 | break; | |
1445 | if (want > type) { | |
1446 | ptr += btrfs_extent_inline_ref_size(type); | |
1447 | continue; | |
1448 | } | |
1449 | ||
1450 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1451 | struct btrfs_extent_data_ref *dref; | |
1452 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1453 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1454 | owner, offset)) { | |
1455 | err = 0; | |
1456 | break; | |
1457 | } | |
1458 | if (hash_extent_data_ref_item(leaf, dref) < | |
1459 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1460 | break; | |
1461 | } else { | |
1462 | u64 ref_offset; | |
1463 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1464 | if (parent > 0) { | |
1465 | if (parent == ref_offset) { | |
1466 | err = 0; | |
1467 | break; | |
1468 | } | |
1469 | if (ref_offset < parent) | |
1470 | break; | |
1471 | } else { | |
1472 | if (root_objectid == ref_offset) { | |
1473 | err = 0; | |
1474 | break; | |
1475 | } | |
1476 | if (ref_offset < root_objectid) | |
1477 | break; | |
1478 | } | |
1479 | } | |
1480 | ptr += btrfs_extent_inline_ref_size(type); | |
1481 | } | |
1482 | if (err == -ENOENT && insert) { | |
1483 | if (item_size + extra_size >= | |
1484 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1485 | err = -EAGAIN; | |
1486 | goto out; | |
1487 | } | |
1488 | /* | |
1489 | * To add new inline back ref, we have to make sure | |
1490 | * there is no corresponding back ref item. | |
1491 | * For simplicity, we just do not add new inline back | |
1492 | * ref if there is any kind of item for this block | |
1493 | */ | |
2c47e605 YZ |
1494 | if (find_next_key(path, 0, &key) == 0 && |
1495 | key.objectid == bytenr && | |
85d4198e | 1496 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1497 | err = -EAGAIN; |
1498 | goto out; | |
1499 | } | |
1500 | } | |
1501 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1502 | out: | |
85d4198e | 1503 | if (insert) { |
5d4f98a2 YZ |
1504 | path->keep_locks = 0; |
1505 | btrfs_unlock_up_safe(path, 1); | |
1506 | } | |
1507 | return err; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * helper to add new inline back ref | |
1512 | */ | |
1513 | static noinline_for_stack | |
1514 | int setup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1515 | struct btrfs_root *root, | |
1516 | struct btrfs_path *path, | |
1517 | struct btrfs_extent_inline_ref *iref, | |
1518 | u64 parent, u64 root_objectid, | |
1519 | u64 owner, u64 offset, int refs_to_add, | |
1520 | struct btrfs_delayed_extent_op *extent_op) | |
1521 | { | |
1522 | struct extent_buffer *leaf; | |
1523 | struct btrfs_extent_item *ei; | |
1524 | unsigned long ptr; | |
1525 | unsigned long end; | |
1526 | unsigned long item_offset; | |
1527 | u64 refs; | |
1528 | int size; | |
1529 | int type; | |
1530 | int ret; | |
1531 | ||
1532 | leaf = path->nodes[0]; | |
1533 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1534 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1535 | ||
1536 | type = extent_ref_type(parent, owner); | |
1537 | size = btrfs_extent_inline_ref_size(type); | |
1538 | ||
1539 | ret = btrfs_extend_item(trans, root, path, size); | |
1540 | BUG_ON(ret); | |
1541 | ||
1542 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1543 | refs = btrfs_extent_refs(leaf, ei); | |
1544 | refs += refs_to_add; | |
1545 | btrfs_set_extent_refs(leaf, ei, refs); | |
1546 | if (extent_op) | |
1547 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1548 | ||
1549 | ptr = (unsigned long)ei + item_offset; | |
1550 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1551 | if (ptr < end - size) | |
1552 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1553 | end - size - ptr); | |
1554 | ||
1555 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1556 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1557 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1558 | struct btrfs_extent_data_ref *dref; | |
1559 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1560 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1561 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1562 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1563 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1564 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1565 | struct btrfs_shared_data_ref *sref; | |
1566 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1567 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1568 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1569 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1570 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1571 | } else { | |
1572 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1573 | } | |
1574 | btrfs_mark_buffer_dirty(leaf); | |
1575 | return 0; | |
1576 | } | |
1577 | ||
1578 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1579 | struct btrfs_root *root, | |
1580 | struct btrfs_path *path, | |
1581 | struct btrfs_extent_inline_ref **ref_ret, | |
1582 | u64 bytenr, u64 num_bytes, u64 parent, | |
1583 | u64 root_objectid, u64 owner, u64 offset) | |
1584 | { | |
1585 | int ret; | |
1586 | ||
1587 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1588 | bytenr, num_bytes, parent, | |
1589 | root_objectid, owner, offset, 0); | |
1590 | if (ret != -ENOENT) | |
54aa1f4d | 1591 | return ret; |
5d4f98a2 YZ |
1592 | |
1593 | btrfs_release_path(root, path); | |
1594 | *ref_ret = NULL; | |
1595 | ||
1596 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1597 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1598 | root_objectid); | |
1599 | } else { | |
1600 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1601 | root_objectid, owner, offset); | |
b9473439 | 1602 | } |
5d4f98a2 YZ |
1603 | return ret; |
1604 | } | |
31840ae1 | 1605 | |
5d4f98a2 YZ |
1606 | /* |
1607 | * helper to update/remove inline back ref | |
1608 | */ | |
1609 | static noinline_for_stack | |
1610 | int update_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1611 | struct btrfs_root *root, | |
1612 | struct btrfs_path *path, | |
1613 | struct btrfs_extent_inline_ref *iref, | |
1614 | int refs_to_mod, | |
1615 | struct btrfs_delayed_extent_op *extent_op) | |
1616 | { | |
1617 | struct extent_buffer *leaf; | |
1618 | struct btrfs_extent_item *ei; | |
1619 | struct btrfs_extent_data_ref *dref = NULL; | |
1620 | struct btrfs_shared_data_ref *sref = NULL; | |
1621 | unsigned long ptr; | |
1622 | unsigned long end; | |
1623 | u32 item_size; | |
1624 | int size; | |
1625 | int type; | |
1626 | int ret; | |
1627 | u64 refs; | |
1628 | ||
1629 | leaf = path->nodes[0]; | |
1630 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1631 | refs = btrfs_extent_refs(leaf, ei); | |
1632 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1633 | refs += refs_to_mod; | |
1634 | btrfs_set_extent_refs(leaf, ei, refs); | |
1635 | if (extent_op) | |
1636 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1637 | ||
1638 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1639 | ||
1640 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1641 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1642 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1643 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1644 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1645 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1646 | } else { | |
1647 | refs = 1; | |
1648 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1649 | } |
31840ae1 | 1650 | |
5d4f98a2 YZ |
1651 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1652 | refs += refs_to_mod; | |
1653 | ||
1654 | if (refs > 0) { | |
1655 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1656 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1657 | else | |
1658 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1659 | } else { | |
1660 | size = btrfs_extent_inline_ref_size(type); | |
1661 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1662 | ptr = (unsigned long)iref; | |
1663 | end = (unsigned long)ei + item_size; | |
1664 | if (ptr + size < end) | |
1665 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1666 | end - ptr - size); | |
1667 | item_size -= size; | |
1668 | ret = btrfs_truncate_item(trans, root, path, item_size, 1); | |
1669 | BUG_ON(ret); | |
1670 | } | |
1671 | btrfs_mark_buffer_dirty(leaf); | |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | static noinline_for_stack | |
1676 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1677 | struct btrfs_root *root, | |
1678 | struct btrfs_path *path, | |
1679 | u64 bytenr, u64 num_bytes, u64 parent, | |
1680 | u64 root_objectid, u64 owner, | |
1681 | u64 offset, int refs_to_add, | |
1682 | struct btrfs_delayed_extent_op *extent_op) | |
1683 | { | |
1684 | struct btrfs_extent_inline_ref *iref; | |
1685 | int ret; | |
1686 | ||
1687 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1688 | bytenr, num_bytes, parent, | |
1689 | root_objectid, owner, offset, 1); | |
1690 | if (ret == 0) { | |
1691 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1692 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1693 | refs_to_add, extent_op); | |
1694 | } else if (ret == -ENOENT) { | |
1695 | ret = setup_inline_extent_backref(trans, root, path, iref, | |
1696 | parent, root_objectid, | |
1697 | owner, offset, refs_to_add, | |
1698 | extent_op); | |
771ed689 | 1699 | } |
5d4f98a2 YZ |
1700 | return ret; |
1701 | } | |
31840ae1 | 1702 | |
5d4f98a2 YZ |
1703 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1704 | struct btrfs_root *root, | |
1705 | struct btrfs_path *path, | |
1706 | u64 bytenr, u64 parent, u64 root_objectid, | |
1707 | u64 owner, u64 offset, int refs_to_add) | |
1708 | { | |
1709 | int ret; | |
1710 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1711 | BUG_ON(refs_to_add != 1); | |
1712 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1713 | parent, root_objectid); | |
1714 | } else { | |
1715 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1716 | parent, root_objectid, | |
1717 | owner, offset, refs_to_add); | |
1718 | } | |
1719 | return ret; | |
1720 | } | |
56bec294 | 1721 | |
5d4f98a2 YZ |
1722 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1723 | struct btrfs_root *root, | |
1724 | struct btrfs_path *path, | |
1725 | struct btrfs_extent_inline_ref *iref, | |
1726 | int refs_to_drop, int is_data) | |
1727 | { | |
1728 | int ret; | |
b9473439 | 1729 | |
5d4f98a2 YZ |
1730 | BUG_ON(!is_data && refs_to_drop != 1); |
1731 | if (iref) { | |
1732 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1733 | -refs_to_drop, NULL); | |
1734 | } else if (is_data) { | |
1735 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1736 | } else { | |
1737 | ret = btrfs_del_item(trans, root, path); | |
1738 | } | |
1739 | return ret; | |
1740 | } | |
1741 | ||
5d4f98a2 YZ |
1742 | static void btrfs_issue_discard(struct block_device *bdev, |
1743 | u64 start, u64 len) | |
1744 | { | |
dd3932ed | 1745 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL, 0); |
5d4f98a2 | 1746 | } |
5d4f98a2 YZ |
1747 | |
1748 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
1749 | u64 num_bytes) | |
1750 | { | |
5d4f98a2 YZ |
1751 | int ret; |
1752 | u64 map_length = num_bytes; | |
1753 | struct btrfs_multi_bio *multi = NULL; | |
1754 | ||
e244a0ae CH |
1755 | if (!btrfs_test_opt(root, DISCARD)) |
1756 | return 0; | |
1757 | ||
5d4f98a2 YZ |
1758 | /* Tell the block device(s) that the sectors can be discarded */ |
1759 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
1760 | bytenr, &map_length, &multi, 0); | |
1761 | if (!ret) { | |
1762 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
1763 | int i; | |
1764 | ||
1765 | if (map_length > num_bytes) | |
1766 | map_length = num_bytes; | |
1767 | ||
1768 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
1769 | btrfs_issue_discard(stripe->dev->bdev, | |
1770 | stripe->physical, | |
1771 | map_length); | |
1772 | } | |
1773 | kfree(multi); | |
1774 | } | |
1775 | ||
1776 | return ret; | |
5d4f98a2 YZ |
1777 | } |
1778 | ||
1779 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1780 | struct btrfs_root *root, | |
1781 | u64 bytenr, u64 num_bytes, u64 parent, | |
1782 | u64 root_objectid, u64 owner, u64 offset) | |
1783 | { | |
1784 | int ret; | |
1785 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1786 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1787 | ||
1788 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1789 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
1790 | parent, root_objectid, (int)owner, | |
1791 | BTRFS_ADD_DELAYED_REF, NULL); | |
1792 | } else { | |
1793 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
1794 | parent, root_objectid, owner, offset, | |
1795 | BTRFS_ADD_DELAYED_REF, NULL); | |
1796 | } | |
1797 | return ret; | |
1798 | } | |
1799 | ||
1800 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1801 | struct btrfs_root *root, | |
1802 | u64 bytenr, u64 num_bytes, | |
1803 | u64 parent, u64 root_objectid, | |
1804 | u64 owner, u64 offset, int refs_to_add, | |
1805 | struct btrfs_delayed_extent_op *extent_op) | |
1806 | { | |
1807 | struct btrfs_path *path; | |
1808 | struct extent_buffer *leaf; | |
1809 | struct btrfs_extent_item *item; | |
1810 | u64 refs; | |
1811 | int ret; | |
1812 | int err = 0; | |
1813 | ||
1814 | path = btrfs_alloc_path(); | |
1815 | if (!path) | |
1816 | return -ENOMEM; | |
1817 | ||
1818 | path->reada = 1; | |
1819 | path->leave_spinning = 1; | |
1820 | /* this will setup the path even if it fails to insert the back ref */ | |
1821 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1822 | path, bytenr, num_bytes, parent, | |
1823 | root_objectid, owner, offset, | |
1824 | refs_to_add, extent_op); | |
1825 | if (ret == 0) | |
1826 | goto out; | |
1827 | ||
1828 | if (ret != -EAGAIN) { | |
1829 | err = ret; | |
1830 | goto out; | |
1831 | } | |
1832 | ||
1833 | leaf = path->nodes[0]; | |
1834 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1835 | refs = btrfs_extent_refs(leaf, item); | |
1836 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1837 | if (extent_op) | |
1838 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1839 | |
5d4f98a2 | 1840 | btrfs_mark_buffer_dirty(leaf); |
56bec294 CM |
1841 | btrfs_release_path(root->fs_info->extent_root, path); |
1842 | ||
1843 | path->reada = 1; | |
b9473439 CM |
1844 | path->leave_spinning = 1; |
1845 | ||
56bec294 CM |
1846 | /* now insert the actual backref */ |
1847 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1848 | path, bytenr, parent, root_objectid, |
1849 | owner, offset, refs_to_add); | |
56bec294 | 1850 | BUG_ON(ret); |
5d4f98a2 | 1851 | out: |
56bec294 | 1852 | btrfs_free_path(path); |
5d4f98a2 | 1853 | return err; |
56bec294 CM |
1854 | } |
1855 | ||
5d4f98a2 YZ |
1856 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1857 | struct btrfs_root *root, | |
1858 | struct btrfs_delayed_ref_node *node, | |
1859 | struct btrfs_delayed_extent_op *extent_op, | |
1860 | int insert_reserved) | |
56bec294 | 1861 | { |
5d4f98a2 YZ |
1862 | int ret = 0; |
1863 | struct btrfs_delayed_data_ref *ref; | |
1864 | struct btrfs_key ins; | |
1865 | u64 parent = 0; | |
1866 | u64 ref_root = 0; | |
1867 | u64 flags = 0; | |
1868 | ||
1869 | ins.objectid = node->bytenr; | |
1870 | ins.offset = node->num_bytes; | |
1871 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1872 | ||
1873 | ref = btrfs_delayed_node_to_data_ref(node); | |
1874 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1875 | parent = ref->parent; | |
1876 | else | |
1877 | ref_root = ref->root; | |
1878 | ||
1879 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1880 | if (extent_op) { | |
1881 | BUG_ON(extent_op->update_key); | |
1882 | flags |= extent_op->flags_to_set; | |
1883 | } | |
1884 | ret = alloc_reserved_file_extent(trans, root, | |
1885 | parent, ref_root, flags, | |
1886 | ref->objectid, ref->offset, | |
1887 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1888 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1889 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1890 | node->num_bytes, parent, | |
1891 | ref_root, ref->objectid, | |
1892 | ref->offset, node->ref_mod, | |
1893 | extent_op); | |
1894 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1895 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1896 | node->num_bytes, parent, | |
1897 | ref_root, ref->objectid, | |
1898 | ref->offset, node->ref_mod, | |
1899 | extent_op); | |
1900 | } else { | |
1901 | BUG(); | |
1902 | } | |
1903 | return ret; | |
1904 | } | |
1905 | ||
1906 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
1907 | struct extent_buffer *leaf, | |
1908 | struct btrfs_extent_item *ei) | |
1909 | { | |
1910 | u64 flags = btrfs_extent_flags(leaf, ei); | |
1911 | if (extent_op->update_flags) { | |
1912 | flags |= extent_op->flags_to_set; | |
1913 | btrfs_set_extent_flags(leaf, ei, flags); | |
1914 | } | |
1915 | ||
1916 | if (extent_op->update_key) { | |
1917 | struct btrfs_tree_block_info *bi; | |
1918 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
1919 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
1920 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
1921 | } | |
1922 | } | |
1923 | ||
1924 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
1925 | struct btrfs_root *root, | |
1926 | struct btrfs_delayed_ref_node *node, | |
1927 | struct btrfs_delayed_extent_op *extent_op) | |
1928 | { | |
1929 | struct btrfs_key key; | |
1930 | struct btrfs_path *path; | |
1931 | struct btrfs_extent_item *ei; | |
1932 | struct extent_buffer *leaf; | |
1933 | u32 item_size; | |
56bec294 | 1934 | int ret; |
5d4f98a2 YZ |
1935 | int err = 0; |
1936 | ||
1937 | path = btrfs_alloc_path(); | |
1938 | if (!path) | |
1939 | return -ENOMEM; | |
1940 | ||
1941 | key.objectid = node->bytenr; | |
1942 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1943 | key.offset = node->num_bytes; | |
1944 | ||
1945 | path->reada = 1; | |
1946 | path->leave_spinning = 1; | |
1947 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
1948 | path, 0, 1); | |
1949 | if (ret < 0) { | |
1950 | err = ret; | |
1951 | goto out; | |
1952 | } | |
1953 | if (ret > 0) { | |
1954 | err = -EIO; | |
1955 | goto out; | |
1956 | } | |
1957 | ||
1958 | leaf = path->nodes[0]; | |
1959 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1960 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1961 | if (item_size < sizeof(*ei)) { | |
1962 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
1963 | path, (u64)-1, 0); | |
1964 | if (ret < 0) { | |
1965 | err = ret; | |
1966 | goto out; | |
1967 | } | |
1968 | leaf = path->nodes[0]; | |
1969 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1970 | } | |
1971 | #endif | |
1972 | BUG_ON(item_size < sizeof(*ei)); | |
1973 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1974 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 1975 | |
5d4f98a2 YZ |
1976 | btrfs_mark_buffer_dirty(leaf); |
1977 | out: | |
1978 | btrfs_free_path(path); | |
1979 | return err; | |
56bec294 CM |
1980 | } |
1981 | ||
5d4f98a2 YZ |
1982 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
1983 | struct btrfs_root *root, | |
1984 | struct btrfs_delayed_ref_node *node, | |
1985 | struct btrfs_delayed_extent_op *extent_op, | |
1986 | int insert_reserved) | |
56bec294 CM |
1987 | { |
1988 | int ret = 0; | |
5d4f98a2 YZ |
1989 | struct btrfs_delayed_tree_ref *ref; |
1990 | struct btrfs_key ins; | |
1991 | u64 parent = 0; | |
1992 | u64 ref_root = 0; | |
56bec294 | 1993 | |
5d4f98a2 YZ |
1994 | ins.objectid = node->bytenr; |
1995 | ins.offset = node->num_bytes; | |
1996 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 1997 | |
5d4f98a2 YZ |
1998 | ref = btrfs_delayed_node_to_tree_ref(node); |
1999 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2000 | parent = ref->parent; | |
2001 | else | |
2002 | ref_root = ref->root; | |
2003 | ||
2004 | BUG_ON(node->ref_mod != 1); | |
2005 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2006 | BUG_ON(!extent_op || !extent_op->update_flags || | |
2007 | !extent_op->update_key); | |
2008 | ret = alloc_reserved_tree_block(trans, root, | |
2009 | parent, ref_root, | |
2010 | extent_op->flags_to_set, | |
2011 | &extent_op->key, | |
2012 | ref->level, &ins); | |
5d4f98a2 YZ |
2013 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2014 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2015 | node->num_bytes, parent, ref_root, | |
2016 | ref->level, 0, 1, extent_op); | |
2017 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2018 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2019 | node->num_bytes, parent, ref_root, | |
2020 | ref->level, 0, 1, extent_op); | |
2021 | } else { | |
2022 | BUG(); | |
2023 | } | |
56bec294 CM |
2024 | return ret; |
2025 | } | |
2026 | ||
2027 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2028 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2029 | struct btrfs_root *root, | |
2030 | struct btrfs_delayed_ref_node *node, | |
2031 | struct btrfs_delayed_extent_op *extent_op, | |
2032 | int insert_reserved) | |
56bec294 CM |
2033 | { |
2034 | int ret; | |
5d4f98a2 | 2035 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2036 | struct btrfs_delayed_ref_head *head; |
2037 | /* | |
2038 | * we've hit the end of the chain and we were supposed | |
2039 | * to insert this extent into the tree. But, it got | |
2040 | * deleted before we ever needed to insert it, so all | |
2041 | * we have to do is clean up the accounting | |
2042 | */ | |
5d4f98a2 YZ |
2043 | BUG_ON(extent_op); |
2044 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2045 | if (insert_reserved) { |
f0486c68 YZ |
2046 | btrfs_pin_extent(root, node->bytenr, |
2047 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2048 | if (head->is_data) { |
2049 | ret = btrfs_del_csums(trans, root, | |
2050 | node->bytenr, | |
2051 | node->num_bytes); | |
2052 | BUG_ON(ret); | |
2053 | } | |
56bec294 | 2054 | } |
56bec294 CM |
2055 | mutex_unlock(&head->mutex); |
2056 | return 0; | |
2057 | } | |
2058 | ||
5d4f98a2 YZ |
2059 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2060 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2061 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2062 | insert_reserved); | |
2063 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2064 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2065 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2066 | insert_reserved); | |
2067 | else | |
2068 | BUG(); | |
2069 | return ret; | |
56bec294 CM |
2070 | } |
2071 | ||
2072 | static noinline struct btrfs_delayed_ref_node * | |
2073 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2074 | { | |
2075 | struct rb_node *node; | |
2076 | struct btrfs_delayed_ref_node *ref; | |
2077 | int action = BTRFS_ADD_DELAYED_REF; | |
2078 | again: | |
2079 | /* | |
2080 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2081 | * this prevents ref count from going down to zero when | |
2082 | * there still are pending delayed ref. | |
2083 | */ | |
2084 | node = rb_prev(&head->node.rb_node); | |
2085 | while (1) { | |
2086 | if (!node) | |
2087 | break; | |
2088 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2089 | rb_node); | |
2090 | if (ref->bytenr != head->node.bytenr) | |
2091 | break; | |
5d4f98a2 | 2092 | if (ref->action == action) |
56bec294 CM |
2093 | return ref; |
2094 | node = rb_prev(node); | |
2095 | } | |
2096 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2097 | action = BTRFS_DROP_DELAYED_REF; | |
2098 | goto again; | |
2099 | } | |
2100 | return NULL; | |
2101 | } | |
2102 | ||
c3e69d58 CM |
2103 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2104 | struct btrfs_root *root, | |
2105 | struct list_head *cluster) | |
56bec294 | 2106 | { |
56bec294 CM |
2107 | struct btrfs_delayed_ref_root *delayed_refs; |
2108 | struct btrfs_delayed_ref_node *ref; | |
2109 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2110 | struct btrfs_delayed_extent_op *extent_op; |
56bec294 | 2111 | int ret; |
c3e69d58 | 2112 | int count = 0; |
56bec294 | 2113 | int must_insert_reserved = 0; |
56bec294 CM |
2114 | |
2115 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2116 | while (1) { |
2117 | if (!locked_ref) { | |
c3e69d58 CM |
2118 | /* pick a new head ref from the cluster list */ |
2119 | if (list_empty(cluster)) | |
56bec294 | 2120 | break; |
56bec294 | 2121 | |
c3e69d58 CM |
2122 | locked_ref = list_entry(cluster->next, |
2123 | struct btrfs_delayed_ref_head, cluster); | |
2124 | ||
2125 | /* grab the lock that says we are going to process | |
2126 | * all the refs for this head */ | |
2127 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2128 | ||
2129 | /* | |
2130 | * we may have dropped the spin lock to get the head | |
2131 | * mutex lock, and that might have given someone else | |
2132 | * time to free the head. If that's true, it has been | |
2133 | * removed from our list and we can move on. | |
2134 | */ | |
2135 | if (ret == -EAGAIN) { | |
2136 | locked_ref = NULL; | |
2137 | count++; | |
2138 | continue; | |
56bec294 CM |
2139 | } |
2140 | } | |
a28ec197 | 2141 | |
56bec294 CM |
2142 | /* |
2143 | * record the must insert reserved flag before we | |
2144 | * drop the spin lock. | |
2145 | */ | |
2146 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2147 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2148 | |
5d4f98a2 YZ |
2149 | extent_op = locked_ref->extent_op; |
2150 | locked_ref->extent_op = NULL; | |
2151 | ||
56bec294 CM |
2152 | /* |
2153 | * locked_ref is the head node, so we have to go one | |
2154 | * node back for any delayed ref updates | |
2155 | */ | |
56bec294 CM |
2156 | ref = select_delayed_ref(locked_ref); |
2157 | if (!ref) { | |
2158 | /* All delayed refs have been processed, Go ahead | |
2159 | * and send the head node to run_one_delayed_ref, | |
2160 | * so that any accounting fixes can happen | |
2161 | */ | |
2162 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2163 | |
2164 | if (extent_op && must_insert_reserved) { | |
2165 | kfree(extent_op); | |
2166 | extent_op = NULL; | |
2167 | } | |
2168 | ||
2169 | if (extent_op) { | |
2170 | spin_unlock(&delayed_refs->lock); | |
2171 | ||
2172 | ret = run_delayed_extent_op(trans, root, | |
2173 | ref, extent_op); | |
2174 | BUG_ON(ret); | |
2175 | kfree(extent_op); | |
2176 | ||
2177 | cond_resched(); | |
2178 | spin_lock(&delayed_refs->lock); | |
2179 | continue; | |
2180 | } | |
2181 | ||
c3e69d58 | 2182 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
2183 | locked_ref = NULL; |
2184 | } | |
02217ed2 | 2185 | |
56bec294 CM |
2186 | ref->in_tree = 0; |
2187 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2188 | delayed_refs->num_entries--; | |
5d4f98a2 | 2189 | |
56bec294 | 2190 | spin_unlock(&delayed_refs->lock); |
925baedd | 2191 | |
5d4f98a2 | 2192 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 CM |
2193 | must_insert_reserved); |
2194 | BUG_ON(ret); | |
eb099670 | 2195 | |
5d4f98a2 YZ |
2196 | btrfs_put_delayed_ref(ref); |
2197 | kfree(extent_op); | |
c3e69d58 | 2198 | count++; |
5d4f98a2 | 2199 | |
c3e69d58 CM |
2200 | cond_resched(); |
2201 | spin_lock(&delayed_refs->lock); | |
2202 | } | |
2203 | return count; | |
2204 | } | |
2205 | ||
2206 | /* | |
2207 | * this starts processing the delayed reference count updates and | |
2208 | * extent insertions we have queued up so far. count can be | |
2209 | * 0, which means to process everything in the tree at the start | |
2210 | * of the run (but not newly added entries), or it can be some target | |
2211 | * number you'd like to process. | |
2212 | */ | |
2213 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2214 | struct btrfs_root *root, unsigned long count) | |
2215 | { | |
2216 | struct rb_node *node; | |
2217 | struct btrfs_delayed_ref_root *delayed_refs; | |
2218 | struct btrfs_delayed_ref_node *ref; | |
2219 | struct list_head cluster; | |
2220 | int ret; | |
2221 | int run_all = count == (unsigned long)-1; | |
2222 | int run_most = 0; | |
2223 | ||
2224 | if (root == root->fs_info->extent_root) | |
2225 | root = root->fs_info->tree_root; | |
2226 | ||
2227 | delayed_refs = &trans->transaction->delayed_refs; | |
2228 | INIT_LIST_HEAD(&cluster); | |
2229 | again: | |
2230 | spin_lock(&delayed_refs->lock); | |
2231 | if (count == 0) { | |
2232 | count = delayed_refs->num_entries * 2; | |
2233 | run_most = 1; | |
2234 | } | |
2235 | while (1) { | |
2236 | if (!(run_all || run_most) && | |
2237 | delayed_refs->num_heads_ready < 64) | |
2238 | break; | |
eb099670 | 2239 | |
56bec294 | 2240 | /* |
c3e69d58 CM |
2241 | * go find something we can process in the rbtree. We start at |
2242 | * the beginning of the tree, and then build a cluster | |
2243 | * of refs to process starting at the first one we are able to | |
2244 | * lock | |
56bec294 | 2245 | */ |
c3e69d58 CM |
2246 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2247 | delayed_refs->run_delayed_start); | |
2248 | if (ret) | |
56bec294 CM |
2249 | break; |
2250 | ||
c3e69d58 CM |
2251 | ret = run_clustered_refs(trans, root, &cluster); |
2252 | BUG_ON(ret < 0); | |
2253 | ||
2254 | count -= min_t(unsigned long, ret, count); | |
2255 | ||
2256 | if (count == 0) | |
2257 | break; | |
eb099670 | 2258 | } |
c3e69d58 | 2259 | |
56bec294 | 2260 | if (run_all) { |
56bec294 | 2261 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2262 | if (!node) |
56bec294 | 2263 | goto out; |
c3e69d58 | 2264 | count = (unsigned long)-1; |
e9d0b13b | 2265 | |
56bec294 CM |
2266 | while (node) { |
2267 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2268 | rb_node); | |
2269 | if (btrfs_delayed_ref_is_head(ref)) { | |
2270 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2271 | |
56bec294 CM |
2272 | head = btrfs_delayed_node_to_head(ref); |
2273 | atomic_inc(&ref->refs); | |
2274 | ||
2275 | spin_unlock(&delayed_refs->lock); | |
2276 | mutex_lock(&head->mutex); | |
2277 | mutex_unlock(&head->mutex); | |
2278 | ||
2279 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2280 | cond_resched(); |
56bec294 CM |
2281 | goto again; |
2282 | } | |
2283 | node = rb_next(node); | |
2284 | } | |
2285 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2286 | schedule_timeout(1); |
2287 | goto again; | |
5f39d397 | 2288 | } |
54aa1f4d | 2289 | out: |
c3e69d58 | 2290 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
2291 | return 0; |
2292 | } | |
2293 | ||
5d4f98a2 YZ |
2294 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2295 | struct btrfs_root *root, | |
2296 | u64 bytenr, u64 num_bytes, u64 flags, | |
2297 | int is_data) | |
2298 | { | |
2299 | struct btrfs_delayed_extent_op *extent_op; | |
2300 | int ret; | |
2301 | ||
2302 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2303 | if (!extent_op) | |
2304 | return -ENOMEM; | |
2305 | ||
2306 | extent_op->flags_to_set = flags; | |
2307 | extent_op->update_flags = 1; | |
2308 | extent_op->update_key = 0; | |
2309 | extent_op->is_data = is_data ? 1 : 0; | |
2310 | ||
2311 | ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); | |
2312 | if (ret) | |
2313 | kfree(extent_op); | |
2314 | return ret; | |
2315 | } | |
2316 | ||
2317 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2318 | struct btrfs_root *root, | |
2319 | struct btrfs_path *path, | |
2320 | u64 objectid, u64 offset, u64 bytenr) | |
2321 | { | |
2322 | struct btrfs_delayed_ref_head *head; | |
2323 | struct btrfs_delayed_ref_node *ref; | |
2324 | struct btrfs_delayed_data_ref *data_ref; | |
2325 | struct btrfs_delayed_ref_root *delayed_refs; | |
2326 | struct rb_node *node; | |
2327 | int ret = 0; | |
2328 | ||
2329 | ret = -ENOENT; | |
2330 | delayed_refs = &trans->transaction->delayed_refs; | |
2331 | spin_lock(&delayed_refs->lock); | |
2332 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2333 | if (!head) | |
2334 | goto out; | |
2335 | ||
2336 | if (!mutex_trylock(&head->mutex)) { | |
2337 | atomic_inc(&head->node.refs); | |
2338 | spin_unlock(&delayed_refs->lock); | |
2339 | ||
2340 | btrfs_release_path(root->fs_info->extent_root, path); | |
2341 | ||
2342 | mutex_lock(&head->mutex); | |
2343 | mutex_unlock(&head->mutex); | |
2344 | btrfs_put_delayed_ref(&head->node); | |
2345 | return -EAGAIN; | |
2346 | } | |
2347 | ||
2348 | node = rb_prev(&head->node.rb_node); | |
2349 | if (!node) | |
2350 | goto out_unlock; | |
2351 | ||
2352 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2353 | ||
2354 | if (ref->bytenr != bytenr) | |
2355 | goto out_unlock; | |
2356 | ||
2357 | ret = 1; | |
2358 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2359 | goto out_unlock; | |
2360 | ||
2361 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2362 | ||
2363 | node = rb_prev(node); | |
2364 | if (node) { | |
2365 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2366 | if (ref->bytenr == bytenr) | |
2367 | goto out_unlock; | |
2368 | } | |
2369 | ||
2370 | if (data_ref->root != root->root_key.objectid || | |
2371 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2372 | goto out_unlock; | |
2373 | ||
2374 | ret = 0; | |
2375 | out_unlock: | |
2376 | mutex_unlock(&head->mutex); | |
2377 | out: | |
2378 | spin_unlock(&delayed_refs->lock); | |
2379 | return ret; | |
2380 | } | |
2381 | ||
2382 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2383 | struct btrfs_root *root, | |
2384 | struct btrfs_path *path, | |
2385 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2386 | { |
2387 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2388 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2389 | struct btrfs_extent_data_ref *ref; |
2390 | struct btrfs_extent_inline_ref *iref; | |
2391 | struct btrfs_extent_item *ei; | |
f321e491 | 2392 | struct btrfs_key key; |
5d4f98a2 | 2393 | u32 item_size; |
be20aa9d | 2394 | int ret; |
925baedd | 2395 | |
be20aa9d | 2396 | key.objectid = bytenr; |
31840ae1 | 2397 | key.offset = (u64)-1; |
f321e491 | 2398 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2399 | |
be20aa9d CM |
2400 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2401 | if (ret < 0) | |
2402 | goto out; | |
2403 | BUG_ON(ret == 0); | |
80ff3856 YZ |
2404 | |
2405 | ret = -ENOENT; | |
2406 | if (path->slots[0] == 0) | |
31840ae1 | 2407 | goto out; |
be20aa9d | 2408 | |
31840ae1 | 2409 | path->slots[0]--; |
f321e491 | 2410 | leaf = path->nodes[0]; |
5d4f98a2 | 2411 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2412 | |
5d4f98a2 | 2413 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2414 | goto out; |
f321e491 | 2415 | |
5d4f98a2 YZ |
2416 | ret = 1; |
2417 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2418 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2419 | if (item_size < sizeof(*ei)) { | |
2420 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2421 | goto out; | |
2422 | } | |
2423 | #endif | |
2424 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2425 | |
5d4f98a2 YZ |
2426 | if (item_size != sizeof(*ei) + |
2427 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2428 | goto out; | |
be20aa9d | 2429 | |
5d4f98a2 YZ |
2430 | if (btrfs_extent_generation(leaf, ei) <= |
2431 | btrfs_root_last_snapshot(&root->root_item)) | |
2432 | goto out; | |
2433 | ||
2434 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2435 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2436 | BTRFS_EXTENT_DATA_REF_KEY) | |
2437 | goto out; | |
2438 | ||
2439 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2440 | if (btrfs_extent_refs(leaf, ei) != | |
2441 | btrfs_extent_data_ref_count(leaf, ref) || | |
2442 | btrfs_extent_data_ref_root(leaf, ref) != | |
2443 | root->root_key.objectid || | |
2444 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2445 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2446 | goto out; | |
2447 | ||
2448 | ret = 0; | |
2449 | out: | |
2450 | return ret; | |
2451 | } | |
2452 | ||
2453 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2454 | struct btrfs_root *root, | |
2455 | u64 objectid, u64 offset, u64 bytenr) | |
2456 | { | |
2457 | struct btrfs_path *path; | |
2458 | int ret; | |
2459 | int ret2; | |
2460 | ||
2461 | path = btrfs_alloc_path(); | |
2462 | if (!path) | |
2463 | return -ENOENT; | |
2464 | ||
2465 | do { | |
2466 | ret = check_committed_ref(trans, root, path, objectid, | |
2467 | offset, bytenr); | |
2468 | if (ret && ret != -ENOENT) | |
f321e491 | 2469 | goto out; |
80ff3856 | 2470 | |
5d4f98a2 YZ |
2471 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2472 | offset, bytenr); | |
2473 | } while (ret2 == -EAGAIN); | |
2474 | ||
2475 | if (ret2 && ret2 != -ENOENT) { | |
2476 | ret = ret2; | |
2477 | goto out; | |
f321e491 | 2478 | } |
5d4f98a2 YZ |
2479 | |
2480 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2481 | ret = 0; | |
be20aa9d | 2482 | out: |
80ff3856 | 2483 | btrfs_free_path(path); |
f0486c68 YZ |
2484 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2485 | WARN_ON(ret > 0); | |
f321e491 | 2486 | return ret; |
be20aa9d | 2487 | } |
c5739bba | 2488 | |
5d4f98a2 | 2489 | #if 0 |
31840ae1 ZY |
2490 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
2491 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 2492 | { |
5f39d397 | 2493 | struct btrfs_key key; |
6407bf6d | 2494 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
2495 | u64 root_gen; |
2496 | u32 nritems; | |
02217ed2 | 2497 | int i; |
db94535d | 2498 | int level; |
31840ae1 | 2499 | int ret = 0; |
e4657689 | 2500 | int shared = 0; |
a28ec197 | 2501 | |
3768f368 | 2502 | if (!root->ref_cows) |
a28ec197 | 2503 | return 0; |
5f39d397 | 2504 | |
e4657689 ZY |
2505 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
2506 | shared = 0; | |
2507 | root_gen = root->root_key.offset; | |
2508 | } else { | |
2509 | shared = 1; | |
2510 | root_gen = trans->transid - 1; | |
2511 | } | |
2512 | ||
db94535d | 2513 | level = btrfs_header_level(buf); |
5f39d397 | 2514 | nritems = btrfs_header_nritems(buf); |
4a096752 | 2515 | |
31840ae1 | 2516 | if (level == 0) { |
31153d81 YZ |
2517 | struct btrfs_leaf_ref *ref; |
2518 | struct btrfs_extent_info *info; | |
2519 | ||
31840ae1 | 2520 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 2521 | if (!ref) { |
31840ae1 | 2522 | ret = -ENOMEM; |
31153d81 YZ |
2523 | goto out; |
2524 | } | |
2525 | ||
e4657689 | 2526 | ref->root_gen = root_gen; |
31153d81 YZ |
2527 | ref->bytenr = buf->start; |
2528 | ref->owner = btrfs_header_owner(buf); | |
2529 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 2530 | ref->nritems = nr_extents; |
31153d81 | 2531 | info = ref->extents; |
bcc63abb | 2532 | |
31840ae1 | 2533 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
2534 | u64 disk_bytenr; |
2535 | btrfs_item_key_to_cpu(buf, &key, i); | |
2536 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
2537 | continue; | |
2538 | fi = btrfs_item_ptr(buf, i, | |
2539 | struct btrfs_file_extent_item); | |
2540 | if (btrfs_file_extent_type(buf, fi) == | |
2541 | BTRFS_FILE_EXTENT_INLINE) | |
2542 | continue; | |
2543 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2544 | if (disk_bytenr == 0) | |
2545 | continue; | |
2546 | ||
2547 | info->bytenr = disk_bytenr; | |
2548 | info->num_bytes = | |
2549 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
2550 | info->objectid = key.objectid; | |
2551 | info->offset = key.offset; | |
2552 | info++; | |
2553 | } | |
2554 | ||
e4657689 | 2555 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
2556 | if (ret == -EEXIST && shared) { |
2557 | struct btrfs_leaf_ref *old; | |
2558 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
2559 | BUG_ON(!old); | |
2560 | btrfs_remove_leaf_ref(root, old); | |
2561 | btrfs_free_leaf_ref(root, old); | |
2562 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
2563 | } | |
31153d81 | 2564 | WARN_ON(ret); |
bcc63abb | 2565 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
2566 | } |
2567 | out: | |
31840ae1 ZY |
2568 | return ret; |
2569 | } | |
2570 | ||
b7a9f29f CM |
2571 | /* when a block goes through cow, we update the reference counts of |
2572 | * everything that block points to. The internal pointers of the block | |
2573 | * can be in just about any order, and it is likely to have clusters of | |
2574 | * things that are close together and clusters of things that are not. | |
2575 | * | |
2576 | * To help reduce the seeks that come with updating all of these reference | |
2577 | * counts, sort them by byte number before actual updates are done. | |
2578 | * | |
2579 | * struct refsort is used to match byte number to slot in the btree block. | |
2580 | * we sort based on the byte number and then use the slot to actually | |
2581 | * find the item. | |
bd56b302 CM |
2582 | * |
2583 | * struct refsort is smaller than strcut btrfs_item and smaller than | |
2584 | * struct btrfs_key_ptr. Since we're currently limited to the page size | |
2585 | * for a btree block, there's no way for a kmalloc of refsorts for a | |
2586 | * single node to be bigger than a page. | |
b7a9f29f CM |
2587 | */ |
2588 | struct refsort { | |
2589 | u64 bytenr; | |
2590 | u32 slot; | |
2591 | }; | |
2592 | ||
2593 | /* | |
2594 | * for passing into sort() | |
2595 | */ | |
2596 | static int refsort_cmp(const void *a_void, const void *b_void) | |
2597 | { | |
2598 | const struct refsort *a = a_void; | |
2599 | const struct refsort *b = b_void; | |
2600 | ||
2601 | if (a->bytenr < b->bytenr) | |
2602 | return -1; | |
2603 | if (a->bytenr > b->bytenr) | |
2604 | return 1; | |
2605 | return 0; | |
2606 | } | |
5d4f98a2 | 2607 | #endif |
b7a9f29f | 2608 | |
5d4f98a2 | 2609 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2610 | struct btrfs_root *root, |
5d4f98a2 YZ |
2611 | struct extent_buffer *buf, |
2612 | int full_backref, int inc) | |
31840ae1 ZY |
2613 | { |
2614 | u64 bytenr; | |
5d4f98a2 YZ |
2615 | u64 num_bytes; |
2616 | u64 parent; | |
31840ae1 | 2617 | u64 ref_root; |
31840ae1 | 2618 | u32 nritems; |
31840ae1 ZY |
2619 | struct btrfs_key key; |
2620 | struct btrfs_file_extent_item *fi; | |
2621 | int i; | |
2622 | int level; | |
2623 | int ret = 0; | |
31840ae1 | 2624 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
5d4f98a2 | 2625 | u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
2626 | |
2627 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2628 | nritems = btrfs_header_nritems(buf); |
2629 | level = btrfs_header_level(buf); | |
2630 | ||
5d4f98a2 YZ |
2631 | if (!root->ref_cows && level == 0) |
2632 | return 0; | |
31840ae1 | 2633 | |
5d4f98a2 YZ |
2634 | if (inc) |
2635 | process_func = btrfs_inc_extent_ref; | |
2636 | else | |
2637 | process_func = btrfs_free_extent; | |
31840ae1 | 2638 | |
5d4f98a2 YZ |
2639 | if (full_backref) |
2640 | parent = buf->start; | |
2641 | else | |
2642 | parent = 0; | |
2643 | ||
2644 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2645 | if (level == 0) { |
5d4f98a2 | 2646 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2647 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2648 | continue; | |
5d4f98a2 | 2649 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2650 | struct btrfs_file_extent_item); |
2651 | if (btrfs_file_extent_type(buf, fi) == | |
2652 | BTRFS_FILE_EXTENT_INLINE) | |
2653 | continue; | |
2654 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2655 | if (bytenr == 0) | |
2656 | continue; | |
5d4f98a2 YZ |
2657 | |
2658 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2659 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2660 | ret = process_func(trans, root, bytenr, num_bytes, | |
2661 | parent, ref_root, key.objectid, | |
2662 | key.offset); | |
31840ae1 ZY |
2663 | if (ret) |
2664 | goto fail; | |
2665 | } else { | |
5d4f98a2 YZ |
2666 | bytenr = btrfs_node_blockptr(buf, i); |
2667 | num_bytes = btrfs_level_size(root, level - 1); | |
2668 | ret = process_func(trans, root, bytenr, num_bytes, | |
2669 | parent, ref_root, level - 1, 0); | |
31840ae1 ZY |
2670 | if (ret) |
2671 | goto fail; | |
2672 | } | |
2673 | } | |
2674 | return 0; | |
2675 | fail: | |
5d4f98a2 YZ |
2676 | BUG(); |
2677 | return ret; | |
2678 | } | |
2679 | ||
2680 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2681 | struct extent_buffer *buf, int full_backref) | |
2682 | { | |
2683 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
2684 | } | |
2685 | ||
2686 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2687 | struct extent_buffer *buf, int full_backref) | |
2688 | { | |
2689 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
31840ae1 ZY |
2690 | } |
2691 | ||
9078a3e1 CM |
2692 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2693 | struct btrfs_root *root, | |
2694 | struct btrfs_path *path, | |
2695 | struct btrfs_block_group_cache *cache) | |
2696 | { | |
2697 | int ret; | |
9078a3e1 | 2698 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2699 | unsigned long bi; |
2700 | struct extent_buffer *leaf; | |
9078a3e1 | 2701 | |
9078a3e1 | 2702 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2703 | if (ret < 0) |
2704 | goto fail; | |
9078a3e1 | 2705 | BUG_ON(ret); |
5f39d397 CM |
2706 | |
2707 | leaf = path->nodes[0]; | |
2708 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2709 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2710 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 2711 | btrfs_release_path(extent_root, path); |
54aa1f4d | 2712 | fail: |
9078a3e1 CM |
2713 | if (ret) |
2714 | return ret; | |
9078a3e1 CM |
2715 | return 0; |
2716 | ||
2717 | } | |
2718 | ||
4a8c9a62 YZ |
2719 | static struct btrfs_block_group_cache * |
2720 | next_block_group(struct btrfs_root *root, | |
2721 | struct btrfs_block_group_cache *cache) | |
2722 | { | |
2723 | struct rb_node *node; | |
2724 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2725 | node = rb_next(&cache->cache_node); | |
2726 | btrfs_put_block_group(cache); | |
2727 | if (node) { | |
2728 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2729 | cache_node); | |
11dfe35a | 2730 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2731 | } else |
2732 | cache = NULL; | |
2733 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2734 | return cache; | |
2735 | } | |
2736 | ||
0af3d00b JB |
2737 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
2738 | struct btrfs_trans_handle *trans, | |
2739 | struct btrfs_path *path) | |
2740 | { | |
2741 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
2742 | struct inode *inode = NULL; | |
2743 | u64 alloc_hint = 0; | |
2744 | int num_pages = 0; | |
2745 | int retries = 0; | |
2746 | int ret = 0; | |
2747 | ||
2748 | /* | |
2749 | * If this block group is smaller than 100 megs don't bother caching the | |
2750 | * block group. | |
2751 | */ | |
2752 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
2753 | spin_lock(&block_group->lock); | |
2754 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
2755 | spin_unlock(&block_group->lock); | |
2756 | return 0; | |
2757 | } | |
2758 | ||
2759 | again: | |
2760 | inode = lookup_free_space_inode(root, block_group, path); | |
2761 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
2762 | ret = PTR_ERR(inode); | |
2763 | btrfs_release_path(root, path); | |
2764 | goto out; | |
2765 | } | |
2766 | ||
2767 | if (IS_ERR(inode)) { | |
2768 | BUG_ON(retries); | |
2769 | retries++; | |
2770 | ||
2771 | if (block_group->ro) | |
2772 | goto out_free; | |
2773 | ||
2774 | ret = create_free_space_inode(root, trans, block_group, path); | |
2775 | if (ret) | |
2776 | goto out_free; | |
2777 | goto again; | |
2778 | } | |
2779 | ||
2780 | /* | |
2781 | * We want to set the generation to 0, that way if anything goes wrong | |
2782 | * from here on out we know not to trust this cache when we load up next | |
2783 | * time. | |
2784 | */ | |
2785 | BTRFS_I(inode)->generation = 0; | |
2786 | ret = btrfs_update_inode(trans, root, inode); | |
2787 | WARN_ON(ret); | |
2788 | ||
2789 | if (i_size_read(inode) > 0) { | |
2790 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
2791 | inode); | |
2792 | if (ret) | |
2793 | goto out_put; | |
2794 | } | |
2795 | ||
2796 | spin_lock(&block_group->lock); | |
2797 | if (block_group->cached != BTRFS_CACHE_FINISHED) { | |
2798 | spin_unlock(&block_group->lock); | |
2799 | goto out_put; | |
2800 | } | |
2801 | spin_unlock(&block_group->lock); | |
2802 | ||
2803 | num_pages = (int)div64_u64(block_group->key.offset, 1024 * 1024 * 1024); | |
2804 | if (!num_pages) | |
2805 | num_pages = 1; | |
2806 | ||
2807 | /* | |
2808 | * Just to make absolutely sure we have enough space, we're going to | |
2809 | * preallocate 12 pages worth of space for each block group. In | |
2810 | * practice we ought to use at most 8, but we need extra space so we can | |
2811 | * add our header and have a terminator between the extents and the | |
2812 | * bitmaps. | |
2813 | */ | |
2814 | num_pages *= 16; | |
2815 | num_pages *= PAGE_CACHE_SIZE; | |
2816 | ||
2817 | ret = btrfs_check_data_free_space(inode, num_pages); | |
2818 | if (ret) | |
2819 | goto out_put; | |
2820 | ||
2821 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
2822 | num_pages, num_pages, | |
2823 | &alloc_hint); | |
2824 | btrfs_free_reserved_data_space(inode, num_pages); | |
2825 | out_put: | |
2826 | iput(inode); | |
2827 | out_free: | |
2828 | btrfs_release_path(root, path); | |
2829 | out: | |
2830 | spin_lock(&block_group->lock); | |
2831 | if (ret) | |
2832 | block_group->disk_cache_state = BTRFS_DC_ERROR; | |
2833 | else | |
2834 | block_group->disk_cache_state = BTRFS_DC_SETUP; | |
2835 | spin_unlock(&block_group->lock); | |
2836 | ||
2837 | return ret; | |
2838 | } | |
2839 | ||
96b5179d CM |
2840 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
2841 | struct btrfs_root *root) | |
9078a3e1 | 2842 | { |
4a8c9a62 | 2843 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 2844 | int err = 0; |
9078a3e1 | 2845 | struct btrfs_path *path; |
96b5179d | 2846 | u64 last = 0; |
9078a3e1 CM |
2847 | |
2848 | path = btrfs_alloc_path(); | |
2849 | if (!path) | |
2850 | return -ENOMEM; | |
2851 | ||
0af3d00b JB |
2852 | again: |
2853 | while (1) { | |
2854 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2855 | while (cache) { | |
2856 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
2857 | break; | |
2858 | cache = next_block_group(root, cache); | |
2859 | } | |
2860 | if (!cache) { | |
2861 | if (last == 0) | |
2862 | break; | |
2863 | last = 0; | |
2864 | continue; | |
2865 | } | |
2866 | err = cache_save_setup(cache, trans, path); | |
2867 | last = cache->key.objectid + cache->key.offset; | |
2868 | btrfs_put_block_group(cache); | |
2869 | } | |
2870 | ||
d397712b | 2871 | while (1) { |
4a8c9a62 YZ |
2872 | if (last == 0) { |
2873 | err = btrfs_run_delayed_refs(trans, root, | |
2874 | (unsigned long)-1); | |
2875 | BUG_ON(err); | |
0f9dd46c | 2876 | } |
54aa1f4d | 2877 | |
4a8c9a62 YZ |
2878 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
2879 | while (cache) { | |
0af3d00b JB |
2880 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
2881 | btrfs_put_block_group(cache); | |
2882 | goto again; | |
2883 | } | |
2884 | ||
4a8c9a62 YZ |
2885 | if (cache->dirty) |
2886 | break; | |
2887 | cache = next_block_group(root, cache); | |
2888 | } | |
2889 | if (!cache) { | |
2890 | if (last == 0) | |
2891 | break; | |
2892 | last = 0; | |
2893 | continue; | |
2894 | } | |
0f9dd46c | 2895 | |
0cb59c99 JB |
2896 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
2897 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 2898 | cache->dirty = 0; |
4a8c9a62 | 2899 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 2900 | |
4a8c9a62 YZ |
2901 | err = write_one_cache_group(trans, root, path, cache); |
2902 | BUG_ON(err); | |
2903 | btrfs_put_block_group(cache); | |
9078a3e1 | 2904 | } |
4a8c9a62 | 2905 | |
0cb59c99 JB |
2906 | while (1) { |
2907 | /* | |
2908 | * I don't think this is needed since we're just marking our | |
2909 | * preallocated extent as written, but just in case it can't | |
2910 | * hurt. | |
2911 | */ | |
2912 | if (last == 0) { | |
2913 | err = btrfs_run_delayed_refs(trans, root, | |
2914 | (unsigned long)-1); | |
2915 | BUG_ON(err); | |
2916 | } | |
2917 | ||
2918 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2919 | while (cache) { | |
2920 | /* | |
2921 | * Really this shouldn't happen, but it could if we | |
2922 | * couldn't write the entire preallocated extent and | |
2923 | * splitting the extent resulted in a new block. | |
2924 | */ | |
2925 | if (cache->dirty) { | |
2926 | btrfs_put_block_group(cache); | |
2927 | goto again; | |
2928 | } | |
2929 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2930 | break; | |
2931 | cache = next_block_group(root, cache); | |
2932 | } | |
2933 | if (!cache) { | |
2934 | if (last == 0) | |
2935 | break; | |
2936 | last = 0; | |
2937 | continue; | |
2938 | } | |
2939 | ||
2940 | btrfs_write_out_cache(root, trans, cache, path); | |
2941 | ||
2942 | /* | |
2943 | * If we didn't have an error then the cache state is still | |
2944 | * NEED_WRITE, so we can set it to WRITTEN. | |
2945 | */ | |
2946 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2947 | cache->disk_cache_state = BTRFS_DC_WRITTEN; | |
2948 | last = cache->key.objectid + cache->key.offset; | |
2949 | btrfs_put_block_group(cache); | |
2950 | } | |
2951 | ||
9078a3e1 | 2952 | btrfs_free_path(path); |
4a8c9a62 | 2953 | return 0; |
9078a3e1 CM |
2954 | } |
2955 | ||
d2fb3437 YZ |
2956 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
2957 | { | |
2958 | struct btrfs_block_group_cache *block_group; | |
2959 | int readonly = 0; | |
2960 | ||
2961 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
2962 | if (!block_group || block_group->ro) | |
2963 | readonly = 1; | |
2964 | if (block_group) | |
fa9c0d79 | 2965 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
2966 | return readonly; |
2967 | } | |
2968 | ||
593060d7 CM |
2969 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
2970 | u64 total_bytes, u64 bytes_used, | |
2971 | struct btrfs_space_info **space_info) | |
2972 | { | |
2973 | struct btrfs_space_info *found; | |
b742bb82 YZ |
2974 | int i; |
2975 | int factor; | |
2976 | ||
2977 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
2978 | BTRFS_BLOCK_GROUP_RAID10)) | |
2979 | factor = 2; | |
2980 | else | |
2981 | factor = 1; | |
593060d7 CM |
2982 | |
2983 | found = __find_space_info(info, flags); | |
2984 | if (found) { | |
25179201 | 2985 | spin_lock(&found->lock); |
593060d7 | 2986 | found->total_bytes += total_bytes; |
89a55897 | 2987 | found->disk_total += total_bytes * factor; |
593060d7 | 2988 | found->bytes_used += bytes_used; |
b742bb82 | 2989 | found->disk_used += bytes_used * factor; |
8f18cf13 | 2990 | found->full = 0; |
25179201 | 2991 | spin_unlock(&found->lock); |
593060d7 CM |
2992 | *space_info = found; |
2993 | return 0; | |
2994 | } | |
c146afad | 2995 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
2996 | if (!found) |
2997 | return -ENOMEM; | |
2998 | ||
b742bb82 YZ |
2999 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
3000 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 3001 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3002 | spin_lock_init(&found->lock); |
b742bb82 YZ |
3003 | found->flags = flags & (BTRFS_BLOCK_GROUP_DATA | |
3004 | BTRFS_BLOCK_GROUP_SYSTEM | | |
3005 | BTRFS_BLOCK_GROUP_METADATA); | |
593060d7 | 3006 | found->total_bytes = total_bytes; |
89a55897 | 3007 | found->disk_total = total_bytes * factor; |
593060d7 | 3008 | found->bytes_used = bytes_used; |
b742bb82 | 3009 | found->disk_used = bytes_used * factor; |
593060d7 | 3010 | found->bytes_pinned = 0; |
e8569813 | 3011 | found->bytes_reserved = 0; |
c146afad | 3012 | found->bytes_readonly = 0; |
f0486c68 | 3013 | found->bytes_may_use = 0; |
593060d7 | 3014 | found->full = 0; |
0ef3e66b | 3015 | found->force_alloc = 0; |
593060d7 | 3016 | *space_info = found; |
4184ea7f | 3017 | list_add_rcu(&found->list, &info->space_info); |
817d52f8 | 3018 | atomic_set(&found->caching_threads, 0); |
593060d7 CM |
3019 | return 0; |
3020 | } | |
3021 | ||
8790d502 CM |
3022 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3023 | { | |
3024 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 3025 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 3026 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 3027 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
3028 | if (extra_flags) { |
3029 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3030 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3031 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3032 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3033 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3034 | fs_info->avail_system_alloc_bits |= extra_flags; | |
3035 | } | |
3036 | } | |
593060d7 | 3037 | |
2b82032c | 3038 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3039 | { |
2b82032c | 3040 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
a061fc8d CM |
3041 | |
3042 | if (num_devices == 1) | |
3043 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
3044 | if (num_devices < 4) | |
3045 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3046 | ||
ec44a35c CM |
3047 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
3048 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 3049 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 3050 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 3051 | } |
ec44a35c CM |
3052 | |
3053 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 3054 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 3055 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 3056 | } |
ec44a35c CM |
3057 | |
3058 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
3059 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
3060 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
3061 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
3062 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
3063 | return flags; | |
3064 | } | |
3065 | ||
b742bb82 | 3066 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3067 | { |
b742bb82 YZ |
3068 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3069 | flags |= root->fs_info->avail_data_alloc_bits & | |
3070 | root->fs_info->data_alloc_profile; | |
3071 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3072 | flags |= root->fs_info->avail_system_alloc_bits & | |
3073 | root->fs_info->system_alloc_profile; | |
3074 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3075 | flags |= root->fs_info->avail_metadata_alloc_bits & | |
3076 | root->fs_info->metadata_alloc_profile; | |
3077 | return btrfs_reduce_alloc_profile(root, flags); | |
6a63209f JB |
3078 | } |
3079 | ||
b742bb82 | 3080 | static u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3081 | { |
b742bb82 | 3082 | u64 flags; |
9ed74f2d | 3083 | |
b742bb82 YZ |
3084 | if (data) |
3085 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3086 | else if (root == root->fs_info->chunk_root) | |
3087 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3088 | else |
b742bb82 | 3089 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3090 | |
b742bb82 | 3091 | return get_alloc_profile(root, flags); |
6a63209f | 3092 | } |
9ed74f2d | 3093 | |
6a63209f JB |
3094 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) |
3095 | { | |
6a63209f | 3096 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, |
f0486c68 | 3097 | BTRFS_BLOCK_GROUP_DATA); |
9ed74f2d JB |
3098 | } |
3099 | ||
6a63209f | 3100 | /* |
6a63209f JB |
3101 | * This will check the space that the inode allocates from to make sure we have |
3102 | * enough space for bytes. | |
6a63209f | 3103 | */ |
0ca1f7ce | 3104 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3105 | { |
6a63209f | 3106 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3107 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ab6e2410 | 3108 | u64 used; |
0af3d00b | 3109 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3110 | |
6a63209f JB |
3111 | /* make sure bytes are sectorsize aligned */ |
3112 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
6a63209f | 3113 | |
0af3d00b JB |
3114 | if (root == root->fs_info->tree_root) { |
3115 | alloc_chunk = 0; | |
3116 | committed = 1; | |
3117 | } | |
3118 | ||
6a63209f | 3119 | data_sinfo = BTRFS_I(inode)->space_info; |
33b4d47f CM |
3120 | if (!data_sinfo) |
3121 | goto alloc; | |
9ed74f2d | 3122 | |
6a63209f JB |
3123 | again: |
3124 | /* make sure we have enough space to handle the data first */ | |
3125 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3126 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3127 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3128 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3129 | |
3130 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3131 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3132 | |
6a63209f JB |
3133 | /* |
3134 | * if we don't have enough free bytes in this space then we need | |
3135 | * to alloc a new chunk. | |
3136 | */ | |
0af3d00b | 3137 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3138 | u64 alloc_target; |
9ed74f2d | 3139 | |
6a63209f JB |
3140 | data_sinfo->force_alloc = 1; |
3141 | spin_unlock(&data_sinfo->lock); | |
33b4d47f | 3142 | alloc: |
6a63209f | 3143 | alloc_target = btrfs_get_alloc_profile(root, 1); |
a22285a6 YZ |
3144 | trans = btrfs_join_transaction(root, 1); |
3145 | if (IS_ERR(trans)) | |
3146 | return PTR_ERR(trans); | |
9ed74f2d | 3147 | |
6a63209f JB |
3148 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
3149 | bytes + 2 * 1024 * 1024, | |
3150 | alloc_target, 0); | |
3151 | btrfs_end_transaction(trans, root); | |
8929ecfa | 3152 | if (ret < 0) |
6a63209f | 3153 | return ret; |
9ed74f2d | 3154 | |
33b4d47f CM |
3155 | if (!data_sinfo) { |
3156 | btrfs_set_inode_space_info(root, inode); | |
3157 | data_sinfo = BTRFS_I(inode)->space_info; | |
3158 | } | |
6a63209f JB |
3159 | goto again; |
3160 | } | |
3161 | spin_unlock(&data_sinfo->lock); | |
6a63209f | 3162 | |
4e06bdd6 | 3163 | /* commit the current transaction and try again */ |
dd7e0b7b | 3164 | if (!committed && !root->fs_info->open_ioctl_trans) { |
4e06bdd6 JB |
3165 | committed = 1; |
3166 | trans = btrfs_join_transaction(root, 1); | |
a22285a6 YZ |
3167 | if (IS_ERR(trans)) |
3168 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3169 | ret = btrfs_commit_transaction(trans, root); |
3170 | if (ret) | |
3171 | return ret; | |
3172 | goto again; | |
3173 | } | |
9ed74f2d | 3174 | |
933b585f | 3175 | #if 0 /* I hope we never need this code again, just in case */ |
8929ecfa YZ |
3176 | printk(KERN_ERR "no space left, need %llu, %llu bytes_used, " |
3177 | "%llu bytes_reserved, " "%llu bytes_pinned, " | |
3178 | "%llu bytes_readonly, %llu may use %llu total\n", | |
3179 | (unsigned long long)bytes, | |
21380931 JB |
3180 | (unsigned long long)data_sinfo->bytes_used, |
3181 | (unsigned long long)data_sinfo->bytes_reserved, | |
3182 | (unsigned long long)data_sinfo->bytes_pinned, | |
3183 | (unsigned long long)data_sinfo->bytes_readonly, | |
3184 | (unsigned long long)data_sinfo->bytes_may_use, | |
3185 | (unsigned long long)data_sinfo->total_bytes); | |
933b585f | 3186 | #endif |
6a63209f JB |
3187 | return -ENOSPC; |
3188 | } | |
3189 | data_sinfo->bytes_may_use += bytes; | |
3190 | BTRFS_I(inode)->reserved_bytes += bytes; | |
3191 | spin_unlock(&data_sinfo->lock); | |
6a63209f | 3192 | |
9ed74f2d | 3193 | return 0; |
9ed74f2d | 3194 | } |
6a63209f | 3195 | |
6a63209f | 3196 | /* |
0ca1f7ce YZ |
3197 | * called when we are clearing an delalloc extent from the |
3198 | * inode's io_tree or there was an error for whatever reason | |
3199 | * after calling btrfs_check_data_free_space | |
6a63209f | 3200 | */ |
0ca1f7ce | 3201 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3202 | { |
0ca1f7ce | 3203 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3204 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3205 | |
6a63209f JB |
3206 | /* make sure bytes are sectorsize aligned */ |
3207 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
e3ccfa98 | 3208 | |
6a63209f JB |
3209 | data_sinfo = BTRFS_I(inode)->space_info; |
3210 | spin_lock(&data_sinfo->lock); | |
3211 | data_sinfo->bytes_may_use -= bytes; | |
3212 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
3213 | spin_unlock(&data_sinfo->lock); | |
e3ccfa98 JB |
3214 | } |
3215 | ||
97e728d4 | 3216 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3217 | { |
97e728d4 JB |
3218 | struct list_head *head = &info->space_info; |
3219 | struct btrfs_space_info *found; | |
e3ccfa98 | 3220 | |
97e728d4 JB |
3221 | rcu_read_lock(); |
3222 | list_for_each_entry_rcu(found, head, list) { | |
3223 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
3224 | found->force_alloc = 1; | |
e3ccfa98 | 3225 | } |
97e728d4 | 3226 | rcu_read_unlock(); |
e3ccfa98 JB |
3227 | } |
3228 | ||
e5bc2458 CM |
3229 | static int should_alloc_chunk(struct btrfs_root *root, |
3230 | struct btrfs_space_info *sinfo, u64 alloc_bytes) | |
32c00aff | 3231 | { |
424499db | 3232 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
e5bc2458 | 3233 | u64 thresh; |
e3ccfa98 | 3234 | |
424499db YZ |
3235 | if (sinfo->bytes_used + sinfo->bytes_reserved + |
3236 | alloc_bytes + 256 * 1024 * 1024 < num_bytes) | |
3237 | return 0; | |
e3ccfa98 | 3238 | |
424499db YZ |
3239 | if (sinfo->bytes_used + sinfo->bytes_reserved + |
3240 | alloc_bytes < div_factor(num_bytes, 8)) | |
3241 | return 0; | |
32c00aff | 3242 | |
e5bc2458 CM |
3243 | thresh = btrfs_super_total_bytes(&root->fs_info->super_copy); |
3244 | thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5)); | |
3245 | ||
3246 | if (num_bytes > thresh && sinfo->bytes_used < div_factor(num_bytes, 3)) | |
14ed0ca6 JB |
3247 | return 0; |
3248 | ||
424499db | 3249 | return 1; |
32c00aff JB |
3250 | } |
3251 | ||
6324fbf3 CM |
3252 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
3253 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 3254 | u64 flags, int force) |
9ed74f2d | 3255 | { |
6324fbf3 | 3256 | struct btrfs_space_info *space_info; |
97e728d4 | 3257 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
9ed74f2d | 3258 | int ret = 0; |
9ed74f2d | 3259 | |
97e728d4 | 3260 | mutex_lock(&fs_info->chunk_mutex); |
9ed74f2d | 3261 | |
2b82032c | 3262 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 3263 | |
6324fbf3 | 3264 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3265 | if (!space_info) { |
3266 | ret = update_space_info(extent_root->fs_info, flags, | |
3267 | 0, 0, &space_info); | |
3268 | BUG_ON(ret); | |
9ed74f2d | 3269 | } |
6324fbf3 | 3270 | BUG_ON(!space_info); |
9ed74f2d | 3271 | |
25179201 | 3272 | spin_lock(&space_info->lock); |
9ed74f2d | 3273 | if (space_info->force_alloc) |
0ef3e66b | 3274 | force = 1; |
25179201 JB |
3275 | if (space_info->full) { |
3276 | spin_unlock(&space_info->lock); | |
925baedd | 3277 | goto out; |
9ed74f2d JB |
3278 | } |
3279 | ||
e5bc2458 CM |
3280 | if (!force && !should_alloc_chunk(extent_root, space_info, |
3281 | alloc_bytes)) { | |
25179201 | 3282 | spin_unlock(&space_info->lock); |
925baedd | 3283 | goto out; |
9ed74f2d | 3284 | } |
25179201 | 3285 | spin_unlock(&space_info->lock); |
9ed74f2d | 3286 | |
67377734 JB |
3287 | /* |
3288 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3289 | * allocating mixed chunks instead of individual chunks. | |
3290 | */ | |
3291 | if (btrfs_mixed_space_info(space_info)) | |
3292 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3293 | ||
97e728d4 JB |
3294 | /* |
3295 | * if we're doing a data chunk, go ahead and make sure that | |
3296 | * we keep a reasonable number of metadata chunks allocated in the | |
3297 | * FS as well. | |
3298 | */ | |
9ed74f2d | 3299 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3300 | fs_info->data_chunk_allocations++; |
3301 | if (!(fs_info->data_chunk_allocations % | |
3302 | fs_info->metadata_ratio)) | |
3303 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3304 | } |
3305 | ||
2b82032c | 3306 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
9ed74f2d | 3307 | spin_lock(&space_info->lock); |
9ed74f2d | 3308 | if (ret) |
6324fbf3 | 3309 | space_info->full = 1; |
424499db YZ |
3310 | else |
3311 | ret = 1; | |
9ed74f2d JB |
3312 | space_info->force_alloc = 0; |
3313 | spin_unlock(&space_info->lock); | |
9ed74f2d | 3314 | out: |
c146afad | 3315 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 3316 | return ret; |
6324fbf3 | 3317 | } |
9ed74f2d | 3318 | |
9ed74f2d | 3319 | /* |
5da9d01b | 3320 | * shrink metadata reservation for delalloc |
9ed74f2d | 3321 | */ |
5da9d01b | 3322 | static int shrink_delalloc(struct btrfs_trans_handle *trans, |
0019f10d | 3323 | struct btrfs_root *root, u64 to_reclaim, int sync) |
5da9d01b | 3324 | { |
0ca1f7ce | 3325 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3326 | struct btrfs_space_info *space_info; |
5da9d01b YZ |
3327 | u64 reserved; |
3328 | u64 max_reclaim; | |
3329 | u64 reclaimed = 0; | |
3330 | int pause = 1; | |
bf9022e0 | 3331 | int nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
5da9d01b | 3332 | |
0ca1f7ce | 3333 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3334 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3335 | |
3336 | smp_mb(); | |
0019f10d | 3337 | reserved = space_info->bytes_reserved; |
5da9d01b YZ |
3338 | |
3339 | if (reserved == 0) | |
3340 | return 0; | |
3341 | ||
3342 | max_reclaim = min(reserved, to_reclaim); | |
3343 | ||
3344 | while (1) { | |
bf9022e0 CM |
3345 | /* have the flusher threads jump in and do some IO */ |
3346 | smp_mb(); | |
3347 | nr_pages = min_t(unsigned long, nr_pages, | |
3348 | root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT); | |
3349 | writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages); | |
5da9d01b | 3350 | |
0019f10d JB |
3351 | spin_lock(&space_info->lock); |
3352 | if (reserved > space_info->bytes_reserved) | |
3353 | reclaimed += reserved - space_info->bytes_reserved; | |
3354 | reserved = space_info->bytes_reserved; | |
3355 | spin_unlock(&space_info->lock); | |
5da9d01b YZ |
3356 | |
3357 | if (reserved == 0 || reclaimed >= max_reclaim) | |
3358 | break; | |
3359 | ||
3360 | if (trans && trans->transaction->blocked) | |
3361 | return -EAGAIN; | |
bf9022e0 CM |
3362 | |
3363 | __set_current_state(TASK_INTERRUPTIBLE); | |
3364 | schedule_timeout(pause); | |
3365 | pause <<= 1; | |
3366 | if (pause > HZ / 10) | |
3367 | pause = HZ / 10; | |
3368 | ||
5da9d01b YZ |
3369 | } |
3370 | return reclaimed >= to_reclaim; | |
3371 | } | |
3372 | ||
8bb8ab2e JB |
3373 | /* |
3374 | * Retries tells us how many times we've called reserve_metadata_bytes. The | |
3375 | * idea is if this is the first call (retries == 0) then we will add to our | |
3376 | * reserved count if we can't make the allocation in order to hold our place | |
3377 | * while we go and try and free up space. That way for retries > 1 we don't try | |
3378 | * and add space, we just check to see if the amount of unused space is >= the | |
3379 | * total space, meaning that our reservation is valid. | |
3380 | * | |
3381 | * However if we don't intend to retry this reservation, pass -1 as retries so | |
3382 | * that it short circuits this logic. | |
3383 | */ | |
3384 | static int reserve_metadata_bytes(struct btrfs_trans_handle *trans, | |
3385 | struct btrfs_root *root, | |
3386 | struct btrfs_block_rsv *block_rsv, | |
3387 | u64 orig_bytes, int flush) | |
9ed74f2d | 3388 | { |
f0486c68 | 3389 | struct btrfs_space_info *space_info = block_rsv->space_info; |
8bb8ab2e JB |
3390 | u64 unused; |
3391 | u64 num_bytes = orig_bytes; | |
3392 | int retries = 0; | |
3393 | int ret = 0; | |
3394 | bool reserved = false; | |
38227933 | 3395 | bool committed = false; |
9ed74f2d | 3396 | |
8bb8ab2e JB |
3397 | again: |
3398 | ret = -ENOSPC; | |
3399 | if (reserved) | |
3400 | num_bytes = 0; | |
9ed74f2d | 3401 | |
8bb8ab2e JB |
3402 | spin_lock(&space_info->lock); |
3403 | unused = space_info->bytes_used + space_info->bytes_reserved + | |
3404 | space_info->bytes_pinned + space_info->bytes_readonly + | |
3405 | space_info->bytes_may_use; | |
9ed74f2d | 3406 | |
8bb8ab2e JB |
3407 | /* |
3408 | * The idea here is that we've not already over-reserved the block group | |
3409 | * then we can go ahead and save our reservation first and then start | |
3410 | * flushing if we need to. Otherwise if we've already overcommitted | |
3411 | * lets start flushing stuff first and then come back and try to make | |
3412 | * our reservation. | |
3413 | */ | |
3414 | if (unused <= space_info->total_bytes) { | |
3415 | unused -= space_info->total_bytes; | |
3416 | if (unused >= num_bytes) { | |
3417 | if (!reserved) | |
3418 | space_info->bytes_reserved += orig_bytes; | |
3419 | ret = 0; | |
3420 | } else { | |
3421 | /* | |
3422 | * Ok set num_bytes to orig_bytes since we aren't | |
3423 | * overocmmitted, this way we only try and reclaim what | |
3424 | * we need. | |
3425 | */ | |
3426 | num_bytes = orig_bytes; | |
3427 | } | |
3428 | } else { | |
3429 | /* | |
3430 | * Ok we're over committed, set num_bytes to the overcommitted | |
3431 | * amount plus the amount of bytes that we need for this | |
3432 | * reservation. | |
3433 | */ | |
3434 | num_bytes = unused - space_info->total_bytes + | |
3435 | (orig_bytes * (retries + 1)); | |
3436 | } | |
9ed74f2d | 3437 | |
8bb8ab2e JB |
3438 | /* |
3439 | * Couldn't make our reservation, save our place so while we're trying | |
3440 | * to reclaim space we can actually use it instead of somebody else | |
3441 | * stealing it from us. | |
3442 | */ | |
3443 | if (ret && !reserved) { | |
3444 | space_info->bytes_reserved += orig_bytes; | |
3445 | reserved = true; | |
3446 | } | |
9ed74f2d | 3447 | |
f0486c68 | 3448 | spin_unlock(&space_info->lock); |
9ed74f2d | 3449 | |
8bb8ab2e JB |
3450 | if (!ret) |
3451 | return 0; | |
9ed74f2d | 3452 | |
8bb8ab2e JB |
3453 | if (!flush) |
3454 | goto out; | |
f0486c68 | 3455 | |
8bb8ab2e JB |
3456 | /* |
3457 | * We do synchronous shrinking since we don't actually unreserve | |
3458 | * metadata until after the IO is completed. | |
3459 | */ | |
3460 | ret = shrink_delalloc(trans, root, num_bytes, 1); | |
3461 | if (ret > 0) | |
3462 | return 0; | |
3463 | else if (ret < 0) | |
3464 | goto out; | |
f0486c68 | 3465 | |
8bb8ab2e JB |
3466 | /* |
3467 | * So if we were overcommitted it's possible that somebody else flushed | |
3468 | * out enough space and we simply didn't have enough space to reclaim, | |
3469 | * so go back around and try again. | |
3470 | */ | |
3471 | if (retries < 2) { | |
3472 | retries++; | |
3473 | goto again; | |
3474 | } | |
f0486c68 YZ |
3475 | |
3476 | spin_lock(&space_info->lock); | |
8bb8ab2e JB |
3477 | /* |
3478 | * Not enough space to be reclaimed, don't bother committing the | |
3479 | * transaction. | |
3480 | */ | |
3481 | if (space_info->bytes_pinned < orig_bytes) | |
3482 | ret = -ENOSPC; | |
3483 | spin_unlock(&space_info->lock); | |
3484 | if (ret) | |
3485 | goto out; | |
f0486c68 | 3486 | |
8bb8ab2e | 3487 | ret = -EAGAIN; |
38227933 | 3488 | if (trans || committed) |
8bb8ab2e | 3489 | goto out; |
f0486c68 | 3490 | |
8bb8ab2e JB |
3491 | ret = -ENOSPC; |
3492 | trans = btrfs_join_transaction(root, 1); | |
3493 | if (IS_ERR(trans)) | |
3494 | goto out; | |
3495 | ret = btrfs_commit_transaction(trans, root); | |
38227933 JB |
3496 | if (!ret) { |
3497 | trans = NULL; | |
3498 | committed = true; | |
8bb8ab2e | 3499 | goto again; |
38227933 | 3500 | } |
8bb8ab2e JB |
3501 | |
3502 | out: | |
3503 | if (reserved) { | |
3504 | spin_lock(&space_info->lock); | |
3505 | space_info->bytes_reserved -= orig_bytes; | |
3506 | spin_unlock(&space_info->lock); | |
f0486c68 | 3507 | } |
4e06bdd6 | 3508 | |
f0486c68 YZ |
3509 | return ret; |
3510 | } | |
3511 | ||
3512 | static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans, | |
3513 | struct btrfs_root *root) | |
3514 | { | |
3515 | struct btrfs_block_rsv *block_rsv; | |
3516 | if (root->ref_cows) | |
3517 | block_rsv = trans->block_rsv; | |
3518 | else | |
3519 | block_rsv = root->block_rsv; | |
3520 | ||
3521 | if (!block_rsv) | |
3522 | block_rsv = &root->fs_info->empty_block_rsv; | |
3523 | ||
3524 | return block_rsv; | |
3525 | } | |
3526 | ||
3527 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
3528 | u64 num_bytes) | |
3529 | { | |
3530 | int ret = -ENOSPC; | |
3531 | spin_lock(&block_rsv->lock); | |
3532 | if (block_rsv->reserved >= num_bytes) { | |
3533 | block_rsv->reserved -= num_bytes; | |
3534 | if (block_rsv->reserved < block_rsv->size) | |
3535 | block_rsv->full = 0; | |
3536 | ret = 0; | |
3537 | } | |
3538 | spin_unlock(&block_rsv->lock); | |
3539 | return ret; | |
3540 | } | |
3541 | ||
3542 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
3543 | u64 num_bytes, int update_size) | |
3544 | { | |
3545 | spin_lock(&block_rsv->lock); | |
3546 | block_rsv->reserved += num_bytes; | |
3547 | if (update_size) | |
3548 | block_rsv->size += num_bytes; | |
3549 | else if (block_rsv->reserved >= block_rsv->size) | |
3550 | block_rsv->full = 1; | |
3551 | spin_unlock(&block_rsv->lock); | |
3552 | } | |
3553 | ||
3554 | void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, | |
3555 | struct btrfs_block_rsv *dest, u64 num_bytes) | |
3556 | { | |
3557 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3558 | ||
3559 | spin_lock(&block_rsv->lock); | |
3560 | if (num_bytes == (u64)-1) | |
3561 | num_bytes = block_rsv->size; | |
3562 | block_rsv->size -= num_bytes; | |
3563 | if (block_rsv->reserved >= block_rsv->size) { | |
3564 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3565 | block_rsv->reserved = block_rsv->size; | |
3566 | block_rsv->full = 1; | |
3567 | } else { | |
3568 | num_bytes = 0; | |
3569 | } | |
3570 | spin_unlock(&block_rsv->lock); | |
3571 | ||
3572 | if (num_bytes > 0) { | |
3573 | if (dest) { | |
3574 | block_rsv_add_bytes(dest, num_bytes, 0); | |
3575 | } else { | |
3576 | spin_lock(&space_info->lock); | |
3577 | space_info->bytes_reserved -= num_bytes; | |
3578 | spin_unlock(&space_info->lock); | |
4e06bdd6 | 3579 | } |
9ed74f2d | 3580 | } |
f0486c68 | 3581 | } |
4e06bdd6 | 3582 | |
f0486c68 YZ |
3583 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
3584 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
3585 | { | |
3586 | int ret; | |
9ed74f2d | 3587 | |
f0486c68 YZ |
3588 | ret = block_rsv_use_bytes(src, num_bytes); |
3589 | if (ret) | |
3590 | return ret; | |
9ed74f2d | 3591 | |
f0486c68 | 3592 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
3593 | return 0; |
3594 | } | |
3595 | ||
f0486c68 | 3596 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv) |
9ed74f2d | 3597 | { |
f0486c68 YZ |
3598 | memset(rsv, 0, sizeof(*rsv)); |
3599 | spin_lock_init(&rsv->lock); | |
3600 | atomic_set(&rsv->usage, 1); | |
3601 | rsv->priority = 6; | |
3602 | INIT_LIST_HEAD(&rsv->list); | |
3603 | } | |
3604 | ||
3605 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root) | |
3606 | { | |
3607 | struct btrfs_block_rsv *block_rsv; | |
3608 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 3609 | |
f0486c68 YZ |
3610 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
3611 | if (!block_rsv) | |
3612 | return NULL; | |
9ed74f2d | 3613 | |
f0486c68 | 3614 | btrfs_init_block_rsv(block_rsv); |
f0486c68 YZ |
3615 | block_rsv->space_info = __find_space_info(fs_info, |
3616 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
3617 | return block_rsv; |
3618 | } | |
9ed74f2d | 3619 | |
f0486c68 YZ |
3620 | void btrfs_free_block_rsv(struct btrfs_root *root, |
3621 | struct btrfs_block_rsv *rsv) | |
3622 | { | |
3623 | if (rsv && atomic_dec_and_test(&rsv->usage)) { | |
3624 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
3625 | if (!rsv->durable) | |
3626 | kfree(rsv); | |
3627 | } | |
9ed74f2d JB |
3628 | } |
3629 | ||
3630 | /* | |
f0486c68 YZ |
3631 | * make the block_rsv struct be able to capture freed space. |
3632 | * the captured space will re-add to the the block_rsv struct | |
3633 | * after transaction commit | |
9ed74f2d | 3634 | */ |
f0486c68 YZ |
3635 | void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info, |
3636 | struct btrfs_block_rsv *block_rsv) | |
9ed74f2d | 3637 | { |
f0486c68 YZ |
3638 | block_rsv->durable = 1; |
3639 | mutex_lock(&fs_info->durable_block_rsv_mutex); | |
3640 | list_add_tail(&block_rsv->list, &fs_info->durable_block_rsv_list); | |
3641 | mutex_unlock(&fs_info->durable_block_rsv_mutex); | |
3642 | } | |
9ed74f2d | 3643 | |
f0486c68 YZ |
3644 | int btrfs_block_rsv_add(struct btrfs_trans_handle *trans, |
3645 | struct btrfs_root *root, | |
3646 | struct btrfs_block_rsv *block_rsv, | |
8bb8ab2e | 3647 | u64 num_bytes) |
f0486c68 YZ |
3648 | { |
3649 | int ret; | |
9ed74f2d | 3650 | |
f0486c68 YZ |
3651 | if (num_bytes == 0) |
3652 | return 0; | |
8bb8ab2e JB |
3653 | |
3654 | ret = reserve_metadata_bytes(trans, root, block_rsv, num_bytes, 1); | |
f0486c68 YZ |
3655 | if (!ret) { |
3656 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
3657 | return 0; | |
3658 | } | |
9ed74f2d | 3659 | |
f0486c68 YZ |
3660 | return ret; |
3661 | } | |
9ed74f2d | 3662 | |
f0486c68 YZ |
3663 | int btrfs_block_rsv_check(struct btrfs_trans_handle *trans, |
3664 | struct btrfs_root *root, | |
3665 | struct btrfs_block_rsv *block_rsv, | |
3666 | u64 min_reserved, int min_factor) | |
3667 | { | |
3668 | u64 num_bytes = 0; | |
3669 | int commit_trans = 0; | |
3670 | int ret = -ENOSPC; | |
9ed74f2d | 3671 | |
f0486c68 YZ |
3672 | if (!block_rsv) |
3673 | return 0; | |
9ed74f2d | 3674 | |
f0486c68 YZ |
3675 | spin_lock(&block_rsv->lock); |
3676 | if (min_factor > 0) | |
3677 | num_bytes = div_factor(block_rsv->size, min_factor); | |
3678 | if (min_reserved > num_bytes) | |
3679 | num_bytes = min_reserved; | |
9ed74f2d | 3680 | |
f0486c68 YZ |
3681 | if (block_rsv->reserved >= num_bytes) { |
3682 | ret = 0; | |
3683 | } else { | |
3684 | num_bytes -= block_rsv->reserved; | |
3685 | if (block_rsv->durable && | |
3686 | block_rsv->freed[0] + block_rsv->freed[1] >= num_bytes) | |
3687 | commit_trans = 1; | |
3688 | } | |
3689 | spin_unlock(&block_rsv->lock); | |
3690 | if (!ret) | |
3691 | return 0; | |
3692 | ||
3693 | if (block_rsv->refill_used) { | |
8bb8ab2e JB |
3694 | ret = reserve_metadata_bytes(trans, root, block_rsv, |
3695 | num_bytes, 0); | |
f0486c68 YZ |
3696 | if (!ret) { |
3697 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
3698 | return 0; | |
4e06bdd6 | 3699 | } |
f0486c68 | 3700 | } |
9ed74f2d | 3701 | |
f0486c68 YZ |
3702 | if (commit_trans) { |
3703 | if (trans) | |
3704 | return -EAGAIN; | |
3705 | ||
3706 | trans = btrfs_join_transaction(root, 1); | |
3707 | BUG_ON(IS_ERR(trans)); | |
3708 | ret = btrfs_commit_transaction(trans, root); | |
3709 | return 0; | |
6a63209f | 3710 | } |
9ed74f2d | 3711 | |
f0486c68 YZ |
3712 | WARN_ON(1); |
3713 | printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n", | |
3714 | block_rsv->size, block_rsv->reserved, | |
3715 | block_rsv->freed[0], block_rsv->freed[1]); | |
6a63209f | 3716 | |
f0486c68 YZ |
3717 | return -ENOSPC; |
3718 | } | |
3719 | ||
3720 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
3721 | struct btrfs_block_rsv *dst_rsv, | |
3722 | u64 num_bytes) | |
3723 | { | |
3724 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
3725 | } | |
3726 | ||
3727 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
3728 | struct btrfs_block_rsv *block_rsv, | |
3729 | u64 num_bytes) | |
3730 | { | |
3731 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
3732 | if (global_rsv->full || global_rsv == block_rsv || | |
3733 | block_rsv->space_info != global_rsv->space_info) | |
3734 | global_rsv = NULL; | |
3735 | block_rsv_release_bytes(block_rsv, global_rsv, num_bytes); | |
6a63209f JB |
3736 | } |
3737 | ||
3738 | /* | |
8929ecfa YZ |
3739 | * helper to calculate size of global block reservation. |
3740 | * the desired value is sum of space used by extent tree, | |
3741 | * checksum tree and root tree | |
6a63209f | 3742 | */ |
8929ecfa | 3743 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 3744 | { |
8929ecfa YZ |
3745 | struct btrfs_space_info *sinfo; |
3746 | u64 num_bytes; | |
3747 | u64 meta_used; | |
3748 | u64 data_used; | |
3749 | int csum_size = btrfs_super_csum_size(&fs_info->super_copy); | |
3750 | #if 0 | |
3751 | /* | |
3752 | * per tree used space accounting can be inaccuracy, so we | |
3753 | * can't rely on it. | |
3754 | */ | |
3755 | spin_lock(&fs_info->extent_root->accounting_lock); | |
3756 | num_bytes = btrfs_root_used(&fs_info->extent_root->root_item); | |
3757 | spin_unlock(&fs_info->extent_root->accounting_lock); | |
6a63209f | 3758 | |
8929ecfa YZ |
3759 | spin_lock(&fs_info->csum_root->accounting_lock); |
3760 | num_bytes += btrfs_root_used(&fs_info->csum_root->root_item); | |
3761 | spin_unlock(&fs_info->csum_root->accounting_lock); | |
6a63209f | 3762 | |
8929ecfa YZ |
3763 | spin_lock(&fs_info->tree_root->accounting_lock); |
3764 | num_bytes += btrfs_root_used(&fs_info->tree_root->root_item); | |
3765 | spin_unlock(&fs_info->tree_root->accounting_lock); | |
3766 | #endif | |
3767 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); | |
3768 | spin_lock(&sinfo->lock); | |
3769 | data_used = sinfo->bytes_used; | |
3770 | spin_unlock(&sinfo->lock); | |
33b4d47f | 3771 | |
8929ecfa YZ |
3772 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
3773 | spin_lock(&sinfo->lock); | |
6d48755d JB |
3774 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
3775 | data_used = 0; | |
8929ecfa YZ |
3776 | meta_used = sinfo->bytes_used; |
3777 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 3778 | |
8929ecfa YZ |
3779 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
3780 | csum_size * 2; | |
3781 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 3782 | |
8929ecfa YZ |
3783 | if (num_bytes * 3 > meta_used) |
3784 | num_bytes = div64_u64(meta_used, 3); | |
ab6e2410 | 3785 | |
8929ecfa YZ |
3786 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
3787 | } | |
6a63209f | 3788 | |
8929ecfa YZ |
3789 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
3790 | { | |
3791 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
3792 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
3793 | u64 num_bytes; | |
6a63209f | 3794 | |
8929ecfa | 3795 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 3796 | |
8929ecfa YZ |
3797 | spin_lock(&block_rsv->lock); |
3798 | spin_lock(&sinfo->lock); | |
4e06bdd6 | 3799 | |
8929ecfa | 3800 | block_rsv->size = num_bytes; |
4e06bdd6 | 3801 | |
8929ecfa | 3802 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
3803 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
3804 | sinfo->bytes_may_use; | |
8929ecfa YZ |
3805 | |
3806 | if (sinfo->total_bytes > num_bytes) { | |
3807 | num_bytes = sinfo->total_bytes - num_bytes; | |
3808 | block_rsv->reserved += num_bytes; | |
3809 | sinfo->bytes_reserved += num_bytes; | |
6a63209f | 3810 | } |
6a63209f | 3811 | |
8929ecfa YZ |
3812 | if (block_rsv->reserved >= block_rsv->size) { |
3813 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3814 | sinfo->bytes_reserved -= num_bytes; | |
3815 | block_rsv->reserved = block_rsv->size; | |
3816 | block_rsv->full = 1; | |
3817 | } | |
3818 | #if 0 | |
3819 | printk(KERN_INFO"global block rsv size %llu reserved %llu\n", | |
3820 | block_rsv->size, block_rsv->reserved); | |
3821 | #endif | |
3822 | spin_unlock(&sinfo->lock); | |
3823 | spin_unlock(&block_rsv->lock); | |
6a63209f JB |
3824 | } |
3825 | ||
f0486c68 | 3826 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3827 | { |
f0486c68 | 3828 | struct btrfs_space_info *space_info; |
6a63209f | 3829 | |
f0486c68 YZ |
3830 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
3831 | fs_info->chunk_block_rsv.space_info = space_info; | |
3832 | fs_info->chunk_block_rsv.priority = 10; | |
6a63209f | 3833 | |
f0486c68 | 3834 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa YZ |
3835 | fs_info->global_block_rsv.space_info = space_info; |
3836 | fs_info->global_block_rsv.priority = 10; | |
3837 | fs_info->global_block_rsv.refill_used = 1; | |
3838 | fs_info->delalloc_block_rsv.space_info = space_info; | |
f0486c68 YZ |
3839 | fs_info->trans_block_rsv.space_info = space_info; |
3840 | fs_info->empty_block_rsv.space_info = space_info; | |
3841 | fs_info->empty_block_rsv.priority = 10; | |
3842 | ||
8929ecfa YZ |
3843 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
3844 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
3845 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
3846 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 3847 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa YZ |
3848 | |
3849 | btrfs_add_durable_block_rsv(fs_info, &fs_info->global_block_rsv); | |
3850 | ||
3851 | btrfs_add_durable_block_rsv(fs_info, &fs_info->delalloc_block_rsv); | |
3852 | ||
3853 | update_global_block_rsv(fs_info); | |
6a63209f JB |
3854 | } |
3855 | ||
8929ecfa | 3856 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3857 | { |
8929ecfa YZ |
3858 | block_rsv_release_bytes(&fs_info->global_block_rsv, NULL, (u64)-1); |
3859 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); | |
3860 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
3861 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
3862 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
3863 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
3864 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
f0486c68 | 3865 | } |
6a63209f | 3866 | |
a22285a6 YZ |
3867 | static u64 calc_trans_metadata_size(struct btrfs_root *root, int num_items) |
3868 | { | |
3869 | return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * | |
3870 | 3 * num_items; | |
3871 | } | |
6a63209f | 3872 | |
a22285a6 YZ |
3873 | int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans, |
3874 | struct btrfs_root *root, | |
8bb8ab2e | 3875 | int num_items) |
a22285a6 YZ |
3876 | { |
3877 | u64 num_bytes; | |
3878 | int ret; | |
6a63209f | 3879 | |
a22285a6 YZ |
3880 | if (num_items == 0 || root->fs_info->chunk_root == root) |
3881 | return 0; | |
6a63209f | 3882 | |
a22285a6 YZ |
3883 | num_bytes = calc_trans_metadata_size(root, num_items); |
3884 | ret = btrfs_block_rsv_add(trans, root, &root->fs_info->trans_block_rsv, | |
8bb8ab2e | 3885 | num_bytes); |
a22285a6 YZ |
3886 | if (!ret) { |
3887 | trans->bytes_reserved += num_bytes; | |
3888 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
3889 | } | |
3890 | return ret; | |
6a63209f JB |
3891 | } |
3892 | ||
a22285a6 YZ |
3893 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
3894 | struct btrfs_root *root) | |
6a63209f | 3895 | { |
a22285a6 YZ |
3896 | if (!trans->bytes_reserved) |
3897 | return; | |
6a63209f | 3898 | |
a22285a6 YZ |
3899 | BUG_ON(trans->block_rsv != &root->fs_info->trans_block_rsv); |
3900 | btrfs_block_rsv_release(root, trans->block_rsv, | |
3901 | trans->bytes_reserved); | |
3902 | trans->bytes_reserved = 0; | |
3903 | } | |
6a63209f | 3904 | |
d68fc57b YZ |
3905 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
3906 | struct inode *inode) | |
3907 | { | |
3908 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3909 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3910 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
3911 | ||
3912 | /* | |
3913 | * one for deleting orphan item, one for updating inode and | |
3914 | * two for calling btrfs_truncate_inode_items. | |
3915 | * | |
3916 | * btrfs_truncate_inode_items is a delete operation, it frees | |
3917 | * more space than it uses in most cases. So two units of | |
3918 | * metadata space should be enough for calling it many times. | |
3919 | * If all of the metadata space is used, we can commit | |
3920 | * transaction and use space it freed. | |
3921 | */ | |
3922 | u64 num_bytes = calc_trans_metadata_size(root, 4); | |
3923 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
6a63209f JB |
3924 | } |
3925 | ||
d68fc57b | 3926 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 3927 | { |
d68fc57b YZ |
3928 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3929 | u64 num_bytes = calc_trans_metadata_size(root, 4); | |
3930 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); | |
3931 | } | |
97e728d4 | 3932 | |
a22285a6 YZ |
3933 | int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, |
3934 | struct btrfs_pending_snapshot *pending) | |
3935 | { | |
3936 | struct btrfs_root *root = pending->root; | |
3937 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3938 | struct btrfs_block_rsv *dst_rsv = &pending->block_rsv; | |
3939 | /* | |
3940 | * two for root back/forward refs, two for directory entries | |
3941 | * and one for root of the snapshot. | |
3942 | */ | |
3943 | u64 num_bytes = calc_trans_metadata_size(root, 5); | |
3944 | dst_rsv->space_info = src_rsv->space_info; | |
3945 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
97e728d4 JB |
3946 | } |
3947 | ||
0ca1f7ce | 3948 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes) |
6324fbf3 | 3949 | { |
0ca1f7ce YZ |
3950 | return num_bytes >>= 3; |
3951 | } | |
c146afad | 3952 | |
0ca1f7ce YZ |
3953 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
3954 | { | |
3955 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3956 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
3957 | u64 to_reserve; | |
3958 | int nr_extents; | |
0ca1f7ce | 3959 | int ret; |
6324fbf3 | 3960 | |
0ca1f7ce YZ |
3961 | if (btrfs_transaction_in_commit(root->fs_info)) |
3962 | schedule_timeout(1); | |
ec44a35c | 3963 | |
0ca1f7ce | 3964 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 3965 | |
0ca1f7ce YZ |
3966 | spin_lock(&BTRFS_I(inode)->accounting_lock); |
3967 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents) + 1; | |
3968 | if (nr_extents > BTRFS_I(inode)->reserved_extents) { | |
3969 | nr_extents -= BTRFS_I(inode)->reserved_extents; | |
3970 | to_reserve = calc_trans_metadata_size(root, nr_extents); | |
3971 | } else { | |
3972 | nr_extents = 0; | |
3973 | to_reserve = 0; | |
593060d7 | 3974 | } |
8bb8ab2e | 3975 | spin_unlock(&BTRFS_I(inode)->accounting_lock); |
6324fbf3 | 3976 | |
0ca1f7ce | 3977 | to_reserve += calc_csum_metadata_size(inode, num_bytes); |
8bb8ab2e JB |
3978 | ret = reserve_metadata_bytes(NULL, root, block_rsv, to_reserve, 1); |
3979 | if (ret) | |
0ca1f7ce | 3980 | return ret; |
6324fbf3 | 3981 | |
8bb8ab2e | 3982 | spin_lock(&BTRFS_I(inode)->accounting_lock); |
0ca1f7ce YZ |
3983 | BTRFS_I(inode)->reserved_extents += nr_extents; |
3984 | atomic_inc(&BTRFS_I(inode)->outstanding_extents); | |
3985 | spin_unlock(&BTRFS_I(inode)->accounting_lock); | |
25179201 | 3986 | |
0ca1f7ce YZ |
3987 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
3988 | ||
3989 | if (block_rsv->size > 512 * 1024 * 1024) | |
0019f10d | 3990 | shrink_delalloc(NULL, root, to_reserve, 0); |
0ca1f7ce YZ |
3991 | |
3992 | return 0; | |
3993 | } | |
3994 | ||
3995 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) | |
3996 | { | |
3997 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3998 | u64 to_free; | |
3999 | int nr_extents; | |
4000 | ||
4001 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
4002 | atomic_dec(&BTRFS_I(inode)->outstanding_extents); | |
4003 | ||
4004 | spin_lock(&BTRFS_I(inode)->accounting_lock); | |
4005 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents); | |
4006 | if (nr_extents < BTRFS_I(inode)->reserved_extents) { | |
4007 | nr_extents = BTRFS_I(inode)->reserved_extents - nr_extents; | |
4008 | BTRFS_I(inode)->reserved_extents -= nr_extents; | |
4009 | } else { | |
4010 | nr_extents = 0; | |
97e728d4 | 4011 | } |
0ca1f7ce | 4012 | spin_unlock(&BTRFS_I(inode)->accounting_lock); |
97e728d4 | 4013 | |
0ca1f7ce YZ |
4014 | to_free = calc_csum_metadata_size(inode, num_bytes); |
4015 | if (nr_extents > 0) | |
4016 | to_free += calc_trans_metadata_size(root, nr_extents); | |
4017 | ||
4018 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, | |
4019 | to_free); | |
4020 | } | |
4021 | ||
4022 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) | |
4023 | { | |
4024 | int ret; | |
4025 | ||
4026 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 4027 | if (ret) |
0ca1f7ce YZ |
4028 | return ret; |
4029 | ||
4030 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
4031 | if (ret) { | |
4032 | btrfs_free_reserved_data_space(inode, num_bytes); | |
4033 | return ret; | |
4034 | } | |
4035 | ||
4036 | return 0; | |
4037 | } | |
4038 | ||
4039 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) | |
4040 | { | |
4041 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
4042 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
4043 | } |
4044 | ||
9078a3e1 CM |
4045 | static int update_block_group(struct btrfs_trans_handle *trans, |
4046 | struct btrfs_root *root, | |
f0486c68 | 4047 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 4048 | { |
0af3d00b | 4049 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 4050 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 4051 | u64 total = num_bytes; |
9078a3e1 | 4052 | u64 old_val; |
db94535d | 4053 | u64 byte_in_group; |
0af3d00b | 4054 | int factor; |
3e1ad54f | 4055 | |
5d4f98a2 YZ |
4056 | /* block accounting for super block */ |
4057 | spin_lock(&info->delalloc_lock); | |
4058 | old_val = btrfs_super_bytes_used(&info->super_copy); | |
4059 | if (alloc) | |
4060 | old_val += num_bytes; | |
4061 | else | |
4062 | old_val -= num_bytes; | |
4063 | btrfs_set_super_bytes_used(&info->super_copy, old_val); | |
5d4f98a2 YZ |
4064 | spin_unlock(&info->delalloc_lock); |
4065 | ||
d397712b | 4066 | while (total) { |
db94535d | 4067 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 4068 | if (!cache) |
9078a3e1 | 4069 | return -1; |
b742bb82 YZ |
4070 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
4071 | BTRFS_BLOCK_GROUP_RAID1 | | |
4072 | BTRFS_BLOCK_GROUP_RAID10)) | |
4073 | factor = 2; | |
4074 | else | |
4075 | factor = 1; | |
9d66e233 JB |
4076 | /* |
4077 | * If this block group has free space cache written out, we | |
4078 | * need to make sure to load it if we are removing space. This | |
4079 | * is because we need the unpinning stage to actually add the | |
4080 | * space back to the block group, otherwise we will leak space. | |
4081 | */ | |
4082 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
4083 | cache_block_group(cache, trans, 1); | |
0af3d00b | 4084 | |
db94535d CM |
4085 | byte_in_group = bytenr - cache->key.objectid; |
4086 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 4087 | |
25179201 | 4088 | spin_lock(&cache->space_info->lock); |
c286ac48 | 4089 | spin_lock(&cache->lock); |
0af3d00b JB |
4090 | |
4091 | if (btrfs_super_cache_generation(&info->super_copy) != 0 && | |
4092 | cache->disk_cache_state < BTRFS_DC_CLEAR) | |
4093 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
4094 | ||
0f9dd46c | 4095 | cache->dirty = 1; |
9078a3e1 | 4096 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 4097 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 4098 | if (alloc) { |
db94535d | 4099 | old_val += num_bytes; |
11833d66 YZ |
4100 | btrfs_set_block_group_used(&cache->item, old_val); |
4101 | cache->reserved -= num_bytes; | |
11833d66 | 4102 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
4103 | cache->space_info->bytes_used += num_bytes; |
4104 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 4105 | spin_unlock(&cache->lock); |
25179201 | 4106 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 4107 | } else { |
db94535d | 4108 | old_val -= num_bytes; |
c286ac48 | 4109 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
4110 | cache->pinned += num_bytes; |
4111 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 4112 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 4113 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 4114 | spin_unlock(&cache->lock); |
25179201 | 4115 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 4116 | |
f0486c68 YZ |
4117 | set_extent_dirty(info->pinned_extents, |
4118 | bytenr, bytenr + num_bytes - 1, | |
4119 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 4120 | } |
fa9c0d79 | 4121 | btrfs_put_block_group(cache); |
db94535d CM |
4122 | total -= num_bytes; |
4123 | bytenr += num_bytes; | |
9078a3e1 CM |
4124 | } |
4125 | return 0; | |
4126 | } | |
6324fbf3 | 4127 | |
a061fc8d CM |
4128 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
4129 | { | |
0f9dd46c | 4130 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 4131 | u64 bytenr; |
0f9dd46c JB |
4132 | |
4133 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
4134 | if (!cache) | |
a061fc8d | 4135 | return 0; |
0f9dd46c | 4136 | |
d2fb3437 | 4137 | bytenr = cache->key.objectid; |
fa9c0d79 | 4138 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
4139 | |
4140 | return bytenr; | |
a061fc8d CM |
4141 | } |
4142 | ||
f0486c68 YZ |
4143 | static int pin_down_extent(struct btrfs_root *root, |
4144 | struct btrfs_block_group_cache *cache, | |
4145 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 4146 | { |
11833d66 YZ |
4147 | spin_lock(&cache->space_info->lock); |
4148 | spin_lock(&cache->lock); | |
4149 | cache->pinned += num_bytes; | |
4150 | cache->space_info->bytes_pinned += num_bytes; | |
4151 | if (reserved) { | |
4152 | cache->reserved -= num_bytes; | |
4153 | cache->space_info->bytes_reserved -= num_bytes; | |
4154 | } | |
4155 | spin_unlock(&cache->lock); | |
4156 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 4157 | |
f0486c68 YZ |
4158 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
4159 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
4160 | return 0; | |
4161 | } | |
68b38550 | 4162 | |
f0486c68 YZ |
4163 | /* |
4164 | * this function must be called within transaction | |
4165 | */ | |
4166 | int btrfs_pin_extent(struct btrfs_root *root, | |
4167 | u64 bytenr, u64 num_bytes, int reserved) | |
4168 | { | |
4169 | struct btrfs_block_group_cache *cache; | |
68b38550 | 4170 | |
f0486c68 YZ |
4171 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
4172 | BUG_ON(!cache); | |
4173 | ||
4174 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
4175 | ||
4176 | btrfs_put_block_group(cache); | |
11833d66 YZ |
4177 | return 0; |
4178 | } | |
4179 | ||
f0486c68 YZ |
4180 | /* |
4181 | * update size of reserved extents. this function may return -EAGAIN | |
4182 | * if 'reserve' is true or 'sinfo' is false. | |
4183 | */ | |
4184 | static int update_reserved_bytes(struct btrfs_block_group_cache *cache, | |
4185 | u64 num_bytes, int reserve, int sinfo) | |
11833d66 | 4186 | { |
f0486c68 YZ |
4187 | int ret = 0; |
4188 | if (sinfo) { | |
4189 | struct btrfs_space_info *space_info = cache->space_info; | |
4190 | spin_lock(&space_info->lock); | |
4191 | spin_lock(&cache->lock); | |
4192 | if (reserve) { | |
4193 | if (cache->ro) { | |
4194 | ret = -EAGAIN; | |
4195 | } else { | |
4196 | cache->reserved += num_bytes; | |
4197 | space_info->bytes_reserved += num_bytes; | |
4198 | } | |
4199 | } else { | |
4200 | if (cache->ro) | |
4201 | space_info->bytes_readonly += num_bytes; | |
4202 | cache->reserved -= num_bytes; | |
4203 | space_info->bytes_reserved -= num_bytes; | |
4204 | } | |
4205 | spin_unlock(&cache->lock); | |
4206 | spin_unlock(&space_info->lock); | |
11833d66 | 4207 | } else { |
f0486c68 YZ |
4208 | spin_lock(&cache->lock); |
4209 | if (cache->ro) { | |
4210 | ret = -EAGAIN; | |
4211 | } else { | |
4212 | if (reserve) | |
4213 | cache->reserved += num_bytes; | |
4214 | else | |
4215 | cache->reserved -= num_bytes; | |
4216 | } | |
4217 | spin_unlock(&cache->lock); | |
324ae4df | 4218 | } |
f0486c68 | 4219 | return ret; |
324ae4df | 4220 | } |
9078a3e1 | 4221 | |
11833d66 YZ |
4222 | int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
4223 | struct btrfs_root *root) | |
e8569813 | 4224 | { |
e8569813 | 4225 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
4226 | struct btrfs_caching_control *next; |
4227 | struct btrfs_caching_control *caching_ctl; | |
4228 | struct btrfs_block_group_cache *cache; | |
e8569813 | 4229 | |
11833d66 | 4230 | down_write(&fs_info->extent_commit_sem); |
25179201 | 4231 | |
11833d66 YZ |
4232 | list_for_each_entry_safe(caching_ctl, next, |
4233 | &fs_info->caching_block_groups, list) { | |
4234 | cache = caching_ctl->block_group; | |
4235 | if (block_group_cache_done(cache)) { | |
4236 | cache->last_byte_to_unpin = (u64)-1; | |
4237 | list_del_init(&caching_ctl->list); | |
4238 | put_caching_control(caching_ctl); | |
e8569813 | 4239 | } else { |
11833d66 | 4240 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 4241 | } |
e8569813 | 4242 | } |
11833d66 YZ |
4243 | |
4244 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
4245 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
4246 | else | |
4247 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
4248 | ||
4249 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
4250 | |
4251 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
4252 | return 0; |
4253 | } | |
4254 | ||
11833d66 | 4255 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 4256 | { |
11833d66 YZ |
4257 | struct btrfs_fs_info *fs_info = root->fs_info; |
4258 | struct btrfs_block_group_cache *cache = NULL; | |
4259 | u64 len; | |
ccd467d6 | 4260 | |
11833d66 YZ |
4261 | while (start <= end) { |
4262 | if (!cache || | |
4263 | start >= cache->key.objectid + cache->key.offset) { | |
4264 | if (cache) | |
4265 | btrfs_put_block_group(cache); | |
4266 | cache = btrfs_lookup_block_group(fs_info, start); | |
4267 | BUG_ON(!cache); | |
4268 | } | |
4269 | ||
4270 | len = cache->key.objectid + cache->key.offset - start; | |
4271 | len = min(len, end + 1 - start); | |
4272 | ||
4273 | if (start < cache->last_byte_to_unpin) { | |
4274 | len = min(len, cache->last_byte_to_unpin - start); | |
4275 | btrfs_add_free_space(cache, start, len); | |
4276 | } | |
4277 | ||
f0486c68 YZ |
4278 | start += len; |
4279 | ||
11833d66 YZ |
4280 | spin_lock(&cache->space_info->lock); |
4281 | spin_lock(&cache->lock); | |
4282 | cache->pinned -= len; | |
4283 | cache->space_info->bytes_pinned -= len; | |
f0486c68 YZ |
4284 | if (cache->ro) { |
4285 | cache->space_info->bytes_readonly += len; | |
4286 | } else if (cache->reserved_pinned > 0) { | |
4287 | len = min(len, cache->reserved_pinned); | |
4288 | cache->reserved_pinned -= len; | |
4289 | cache->space_info->bytes_reserved += len; | |
4290 | } | |
11833d66 YZ |
4291 | spin_unlock(&cache->lock); |
4292 | spin_unlock(&cache->space_info->lock); | |
ccd467d6 | 4293 | } |
11833d66 YZ |
4294 | |
4295 | if (cache) | |
4296 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
4297 | return 0; |
4298 | } | |
4299 | ||
4300 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 4301 | struct btrfs_root *root) |
a28ec197 | 4302 | { |
11833d66 YZ |
4303 | struct btrfs_fs_info *fs_info = root->fs_info; |
4304 | struct extent_io_tree *unpin; | |
f0486c68 YZ |
4305 | struct btrfs_block_rsv *block_rsv; |
4306 | struct btrfs_block_rsv *next_rsv; | |
1a5bc167 CM |
4307 | u64 start; |
4308 | u64 end; | |
f0486c68 | 4309 | int idx; |
a28ec197 | 4310 | int ret; |
a28ec197 | 4311 | |
11833d66 YZ |
4312 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
4313 | unpin = &fs_info->freed_extents[1]; | |
4314 | else | |
4315 | unpin = &fs_info->freed_extents[0]; | |
4316 | ||
d397712b | 4317 | while (1) { |
1a5bc167 CM |
4318 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
4319 | EXTENT_DIRTY); | |
4320 | if (ret) | |
a28ec197 | 4321 | break; |
1f3c79a2 LH |
4322 | |
4323 | ret = btrfs_discard_extent(root, start, end + 1 - start); | |
4324 | ||
1a5bc167 | 4325 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 4326 | unpin_extent_range(root, start, end); |
b9473439 | 4327 | cond_resched(); |
a28ec197 | 4328 | } |
817d52f8 | 4329 | |
f0486c68 YZ |
4330 | mutex_lock(&fs_info->durable_block_rsv_mutex); |
4331 | list_for_each_entry_safe(block_rsv, next_rsv, | |
4332 | &fs_info->durable_block_rsv_list, list) { | |
444528b3 | 4333 | |
f0486c68 YZ |
4334 | idx = trans->transid & 0x1; |
4335 | if (block_rsv->freed[idx] > 0) { | |
4336 | block_rsv_add_bytes(block_rsv, | |
4337 | block_rsv->freed[idx], 0); | |
4338 | block_rsv->freed[idx] = 0; | |
4339 | } | |
4340 | if (atomic_read(&block_rsv->usage) == 0) { | |
4341 | btrfs_block_rsv_release(root, block_rsv, (u64)-1); | |
31840ae1 | 4342 | |
f0486c68 YZ |
4343 | if (block_rsv->freed[0] == 0 && |
4344 | block_rsv->freed[1] == 0) { | |
4345 | list_del_init(&block_rsv->list); | |
4346 | kfree(block_rsv); | |
4347 | } | |
4348 | } else { | |
4349 | btrfs_block_rsv_release(root, block_rsv, 0); | |
8ef97622 | 4350 | } |
f4b9aa8d | 4351 | } |
f0486c68 | 4352 | mutex_unlock(&fs_info->durable_block_rsv_mutex); |
31840ae1 | 4353 | |
e20d96d6 CM |
4354 | return 0; |
4355 | } | |
4356 | ||
5d4f98a2 YZ |
4357 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
4358 | struct btrfs_root *root, | |
4359 | u64 bytenr, u64 num_bytes, u64 parent, | |
4360 | u64 root_objectid, u64 owner_objectid, | |
4361 | u64 owner_offset, int refs_to_drop, | |
4362 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 4363 | { |
e2fa7227 | 4364 | struct btrfs_key key; |
5d4f98a2 | 4365 | struct btrfs_path *path; |
1261ec42 CM |
4366 | struct btrfs_fs_info *info = root->fs_info; |
4367 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 4368 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
4369 | struct btrfs_extent_item *ei; |
4370 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 4371 | int ret; |
5d4f98a2 | 4372 | int is_data; |
952fccac CM |
4373 | int extent_slot = 0; |
4374 | int found_extent = 0; | |
4375 | int num_to_del = 1; | |
5d4f98a2 YZ |
4376 | u32 item_size; |
4377 | u64 refs; | |
037e6390 | 4378 | |
5caf2a00 | 4379 | path = btrfs_alloc_path(); |
54aa1f4d CM |
4380 | if (!path) |
4381 | return -ENOMEM; | |
5f26f772 | 4382 | |
3c12ac72 | 4383 | path->reada = 1; |
b9473439 | 4384 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4385 | |
4386 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
4387 | BUG_ON(!is_data && refs_to_drop != 1); | |
4388 | ||
4389 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
4390 | bytenr, num_bytes, parent, | |
4391 | root_objectid, owner_objectid, | |
4392 | owner_offset); | |
7bb86316 | 4393 | if (ret == 0) { |
952fccac | 4394 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
4395 | while (extent_slot >= 0) { |
4396 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 4397 | extent_slot); |
5d4f98a2 | 4398 | if (key.objectid != bytenr) |
952fccac | 4399 | break; |
5d4f98a2 YZ |
4400 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
4401 | key.offset == num_bytes) { | |
952fccac CM |
4402 | found_extent = 1; |
4403 | break; | |
4404 | } | |
4405 | if (path->slots[0] - extent_slot > 5) | |
4406 | break; | |
5d4f98a2 | 4407 | extent_slot--; |
952fccac | 4408 | } |
5d4f98a2 YZ |
4409 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
4410 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
4411 | if (found_extent && item_size < sizeof(*ei)) | |
4412 | found_extent = 0; | |
4413 | #endif | |
31840ae1 | 4414 | if (!found_extent) { |
5d4f98a2 | 4415 | BUG_ON(iref); |
56bec294 | 4416 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
4417 | NULL, refs_to_drop, |
4418 | is_data); | |
31840ae1 ZY |
4419 | BUG_ON(ret); |
4420 | btrfs_release_path(extent_root, path); | |
b9473439 | 4421 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4422 | |
4423 | key.objectid = bytenr; | |
4424 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4425 | key.offset = num_bytes; | |
4426 | ||
31840ae1 ZY |
4427 | ret = btrfs_search_slot(trans, extent_root, |
4428 | &key, path, -1, 1); | |
f3465ca4 JB |
4429 | if (ret) { |
4430 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
4431 | ", was looking for %llu\n", ret, |
4432 | (unsigned long long)bytenr); | |
f3465ca4 JB |
4433 | btrfs_print_leaf(extent_root, path->nodes[0]); |
4434 | } | |
31840ae1 ZY |
4435 | BUG_ON(ret); |
4436 | extent_slot = path->slots[0]; | |
4437 | } | |
7bb86316 CM |
4438 | } else { |
4439 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4440 | WARN_ON(1); | |
d397712b | 4441 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 4442 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 4443 | (unsigned long long)bytenr, |
56bec294 | 4444 | (unsigned long long)parent, |
d397712b | 4445 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
4446 | (unsigned long long)owner_objectid, |
4447 | (unsigned long long)owner_offset); | |
7bb86316 | 4448 | } |
5f39d397 CM |
4449 | |
4450 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
4451 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
4452 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
4453 | if (item_size < sizeof(*ei)) { | |
4454 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
4455 | ret = convert_extent_item_v0(trans, extent_root, path, | |
4456 | owner_objectid, 0); | |
4457 | BUG_ON(ret < 0); | |
4458 | ||
4459 | btrfs_release_path(extent_root, path); | |
4460 | path->leave_spinning = 1; | |
4461 | ||
4462 | key.objectid = bytenr; | |
4463 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4464 | key.offset = num_bytes; | |
4465 | ||
4466 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
4467 | -1, 1); | |
4468 | if (ret) { | |
4469 | printk(KERN_ERR "umm, got %d back from search" | |
4470 | ", was looking for %llu\n", ret, | |
4471 | (unsigned long long)bytenr); | |
4472 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4473 | } | |
4474 | BUG_ON(ret); | |
4475 | extent_slot = path->slots[0]; | |
4476 | leaf = path->nodes[0]; | |
4477 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
4478 | } | |
4479 | #endif | |
4480 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 4481 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 4482 | struct btrfs_extent_item); |
5d4f98a2 YZ |
4483 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
4484 | struct btrfs_tree_block_info *bi; | |
4485 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
4486 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
4487 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
4488 | } | |
56bec294 | 4489 | |
5d4f98a2 | 4490 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
4491 | BUG_ON(refs < refs_to_drop); |
4492 | refs -= refs_to_drop; | |
5f39d397 | 4493 | |
5d4f98a2 YZ |
4494 | if (refs > 0) { |
4495 | if (extent_op) | |
4496 | __run_delayed_extent_op(extent_op, leaf, ei); | |
4497 | /* | |
4498 | * In the case of inline back ref, reference count will | |
4499 | * be updated by remove_extent_backref | |
952fccac | 4500 | */ |
5d4f98a2 YZ |
4501 | if (iref) { |
4502 | BUG_ON(!found_extent); | |
4503 | } else { | |
4504 | btrfs_set_extent_refs(leaf, ei, refs); | |
4505 | btrfs_mark_buffer_dirty(leaf); | |
4506 | } | |
4507 | if (found_extent) { | |
4508 | ret = remove_extent_backref(trans, extent_root, path, | |
4509 | iref, refs_to_drop, | |
4510 | is_data); | |
952fccac CM |
4511 | BUG_ON(ret); |
4512 | } | |
5d4f98a2 | 4513 | } else { |
5d4f98a2 YZ |
4514 | if (found_extent) { |
4515 | BUG_ON(is_data && refs_to_drop != | |
4516 | extent_data_ref_count(root, path, iref)); | |
4517 | if (iref) { | |
4518 | BUG_ON(path->slots[0] != extent_slot); | |
4519 | } else { | |
4520 | BUG_ON(path->slots[0] != extent_slot + 1); | |
4521 | path->slots[0] = extent_slot; | |
4522 | num_to_del = 2; | |
4523 | } | |
78fae27e | 4524 | } |
b9473439 | 4525 | |
952fccac CM |
4526 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
4527 | num_to_del); | |
31840ae1 | 4528 | BUG_ON(ret); |
25179201 | 4529 | btrfs_release_path(extent_root, path); |
21af804c | 4530 | |
5d4f98a2 | 4531 | if (is_data) { |
459931ec CM |
4532 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
4533 | BUG_ON(ret); | |
d57e62b8 CM |
4534 | } else { |
4535 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
4536 | bytenr >> PAGE_CACHE_SHIFT, | |
4537 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
4538 | } |
4539 | ||
f0486c68 | 4540 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
dcbdd4dc | 4541 | BUG_ON(ret); |
a28ec197 | 4542 | } |
5caf2a00 | 4543 | btrfs_free_path(path); |
a28ec197 CM |
4544 | return ret; |
4545 | } | |
4546 | ||
1887be66 | 4547 | /* |
f0486c68 | 4548 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
4549 | * delayed ref for that extent as well. This searches the delayed ref tree for |
4550 | * a given extent, and if there are no other delayed refs to be processed, it | |
4551 | * removes it from the tree. | |
4552 | */ | |
4553 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
4554 | struct btrfs_root *root, u64 bytenr) | |
4555 | { | |
4556 | struct btrfs_delayed_ref_head *head; | |
4557 | struct btrfs_delayed_ref_root *delayed_refs; | |
4558 | struct btrfs_delayed_ref_node *ref; | |
4559 | struct rb_node *node; | |
f0486c68 | 4560 | int ret = 0; |
1887be66 CM |
4561 | |
4562 | delayed_refs = &trans->transaction->delayed_refs; | |
4563 | spin_lock(&delayed_refs->lock); | |
4564 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
4565 | if (!head) | |
4566 | goto out; | |
4567 | ||
4568 | node = rb_prev(&head->node.rb_node); | |
4569 | if (!node) | |
4570 | goto out; | |
4571 | ||
4572 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
4573 | ||
4574 | /* there are still entries for this ref, we can't drop it */ | |
4575 | if (ref->bytenr == bytenr) | |
4576 | goto out; | |
4577 | ||
5d4f98a2 YZ |
4578 | if (head->extent_op) { |
4579 | if (!head->must_insert_reserved) | |
4580 | goto out; | |
4581 | kfree(head->extent_op); | |
4582 | head->extent_op = NULL; | |
4583 | } | |
4584 | ||
1887be66 CM |
4585 | /* |
4586 | * waiting for the lock here would deadlock. If someone else has it | |
4587 | * locked they are already in the process of dropping it anyway | |
4588 | */ | |
4589 | if (!mutex_trylock(&head->mutex)) | |
4590 | goto out; | |
4591 | ||
4592 | /* | |
4593 | * at this point we have a head with no other entries. Go | |
4594 | * ahead and process it. | |
4595 | */ | |
4596 | head->node.in_tree = 0; | |
4597 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 4598 | |
1887be66 CM |
4599 | delayed_refs->num_entries--; |
4600 | ||
4601 | /* | |
4602 | * we don't take a ref on the node because we're removing it from the | |
4603 | * tree, so we just steal the ref the tree was holding. | |
4604 | */ | |
c3e69d58 CM |
4605 | delayed_refs->num_heads--; |
4606 | if (list_empty(&head->cluster)) | |
4607 | delayed_refs->num_heads_ready--; | |
4608 | ||
4609 | list_del_init(&head->cluster); | |
1887be66 CM |
4610 | spin_unlock(&delayed_refs->lock); |
4611 | ||
f0486c68 YZ |
4612 | BUG_ON(head->extent_op); |
4613 | if (head->must_insert_reserved) | |
4614 | ret = 1; | |
4615 | ||
4616 | mutex_unlock(&head->mutex); | |
1887be66 | 4617 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 4618 | return ret; |
1887be66 CM |
4619 | out: |
4620 | spin_unlock(&delayed_refs->lock); | |
4621 | return 0; | |
4622 | } | |
4623 | ||
f0486c68 YZ |
4624 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
4625 | struct btrfs_root *root, | |
4626 | struct extent_buffer *buf, | |
4627 | u64 parent, int last_ref) | |
4628 | { | |
4629 | struct btrfs_block_rsv *block_rsv; | |
4630 | struct btrfs_block_group_cache *cache = NULL; | |
4631 | int ret; | |
4632 | ||
4633 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4634 | ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, | |
4635 | parent, root->root_key.objectid, | |
4636 | btrfs_header_level(buf), | |
4637 | BTRFS_DROP_DELAYED_REF, NULL); | |
4638 | BUG_ON(ret); | |
4639 | } | |
4640 | ||
4641 | if (!last_ref) | |
4642 | return; | |
4643 | ||
4644 | block_rsv = get_block_rsv(trans, root); | |
4645 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); | |
3bf84a5a YZ |
4646 | if (block_rsv->space_info != cache->space_info) |
4647 | goto out; | |
f0486c68 YZ |
4648 | |
4649 | if (btrfs_header_generation(buf) == trans->transid) { | |
4650 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4651 | ret = check_ref_cleanup(trans, root, buf->start); | |
4652 | if (!ret) | |
4653 | goto pin; | |
4654 | } | |
4655 | ||
4656 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
4657 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
4658 | goto pin; | |
4659 | } | |
4660 | ||
4661 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
4662 | ||
4663 | btrfs_add_free_space(cache, buf->start, buf->len); | |
4664 | ret = update_reserved_bytes(cache, buf->len, 0, 0); | |
4665 | if (ret == -EAGAIN) { | |
4666 | /* block group became read-only */ | |
4667 | update_reserved_bytes(cache, buf->len, 0, 1); | |
4668 | goto out; | |
4669 | } | |
4670 | ||
4671 | ret = 1; | |
4672 | spin_lock(&block_rsv->lock); | |
4673 | if (block_rsv->reserved < block_rsv->size) { | |
4674 | block_rsv->reserved += buf->len; | |
4675 | ret = 0; | |
4676 | } | |
4677 | spin_unlock(&block_rsv->lock); | |
4678 | ||
4679 | if (ret) { | |
4680 | spin_lock(&cache->space_info->lock); | |
4681 | cache->space_info->bytes_reserved -= buf->len; | |
4682 | spin_unlock(&cache->space_info->lock); | |
4683 | } | |
4684 | goto out; | |
4685 | } | |
4686 | pin: | |
4687 | if (block_rsv->durable && !cache->ro) { | |
4688 | ret = 0; | |
4689 | spin_lock(&cache->lock); | |
4690 | if (!cache->ro) { | |
4691 | cache->reserved_pinned += buf->len; | |
4692 | ret = 1; | |
4693 | } | |
4694 | spin_unlock(&cache->lock); | |
4695 | ||
4696 | if (ret) { | |
4697 | spin_lock(&block_rsv->lock); | |
4698 | block_rsv->freed[trans->transid & 0x1] += buf->len; | |
4699 | spin_unlock(&block_rsv->lock); | |
4700 | } | |
4701 | } | |
4702 | out: | |
4703 | btrfs_put_block_group(cache); | |
4704 | } | |
4705 | ||
925baedd | 4706 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
4707 | struct btrfs_root *root, |
4708 | u64 bytenr, u64 num_bytes, u64 parent, | |
5d4f98a2 | 4709 | u64 root_objectid, u64 owner, u64 offset) |
925baedd CM |
4710 | { |
4711 | int ret; | |
4712 | ||
56bec294 CM |
4713 | /* |
4714 | * tree log blocks never actually go into the extent allocation | |
4715 | * tree, just update pinning info and exit early. | |
56bec294 | 4716 | */ |
5d4f98a2 YZ |
4717 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
4718 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 4719 | /* unlocks the pinned mutex */ |
11833d66 | 4720 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 4721 | ret = 0; |
5d4f98a2 YZ |
4722 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
4723 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
4724 | parent, root_objectid, (int)owner, | |
4725 | BTRFS_DROP_DELAYED_REF, NULL); | |
1887be66 | 4726 | BUG_ON(ret); |
5d4f98a2 YZ |
4727 | } else { |
4728 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
4729 | parent, root_objectid, owner, | |
4730 | offset, BTRFS_DROP_DELAYED_REF, NULL); | |
4731 | BUG_ON(ret); | |
56bec294 | 4732 | } |
925baedd CM |
4733 | return ret; |
4734 | } | |
4735 | ||
87ee04eb CM |
4736 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
4737 | { | |
4738 | u64 mask = ((u64)root->stripesize - 1); | |
4739 | u64 ret = (val + mask) & ~mask; | |
4740 | return ret; | |
4741 | } | |
4742 | ||
817d52f8 JB |
4743 | /* |
4744 | * when we wait for progress in the block group caching, its because | |
4745 | * our allocation attempt failed at least once. So, we must sleep | |
4746 | * and let some progress happen before we try again. | |
4747 | * | |
4748 | * This function will sleep at least once waiting for new free space to | |
4749 | * show up, and then it will check the block group free space numbers | |
4750 | * for our min num_bytes. Another option is to have it go ahead | |
4751 | * and look in the rbtree for a free extent of a given size, but this | |
4752 | * is a good start. | |
4753 | */ | |
4754 | static noinline int | |
4755 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
4756 | u64 num_bytes) | |
4757 | { | |
11833d66 | 4758 | struct btrfs_caching_control *caching_ctl; |
817d52f8 JB |
4759 | DEFINE_WAIT(wait); |
4760 | ||
11833d66 YZ |
4761 | caching_ctl = get_caching_control(cache); |
4762 | if (!caching_ctl) | |
817d52f8 | 4763 | return 0; |
817d52f8 | 4764 | |
11833d66 | 4765 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
817d52f8 | 4766 | (cache->free_space >= num_bytes)); |
11833d66 YZ |
4767 | |
4768 | put_caching_control(caching_ctl); | |
4769 | return 0; | |
4770 | } | |
4771 | ||
4772 | static noinline int | |
4773 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
4774 | { | |
4775 | struct btrfs_caching_control *caching_ctl; | |
4776 | DEFINE_WAIT(wait); | |
4777 | ||
4778 | caching_ctl = get_caching_control(cache); | |
4779 | if (!caching_ctl) | |
4780 | return 0; | |
4781 | ||
4782 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
4783 | ||
4784 | put_caching_control(caching_ctl); | |
817d52f8 JB |
4785 | return 0; |
4786 | } | |
4787 | ||
b742bb82 YZ |
4788 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
4789 | { | |
4790 | int index; | |
4791 | if (cache->flags & BTRFS_BLOCK_GROUP_RAID10) | |
4792 | index = 0; | |
4793 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1) | |
4794 | index = 1; | |
4795 | else if (cache->flags & BTRFS_BLOCK_GROUP_DUP) | |
4796 | index = 2; | |
4797 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) | |
4798 | index = 3; | |
4799 | else | |
4800 | index = 4; | |
4801 | return index; | |
4802 | } | |
4803 | ||
817d52f8 | 4804 | enum btrfs_loop_type { |
ccf0e725 | 4805 | LOOP_FIND_IDEAL = 0, |
817d52f8 JB |
4806 | LOOP_CACHING_NOWAIT = 1, |
4807 | LOOP_CACHING_WAIT = 2, | |
4808 | LOOP_ALLOC_CHUNK = 3, | |
4809 | LOOP_NO_EMPTY_SIZE = 4, | |
4810 | }; | |
4811 | ||
fec577fb CM |
4812 | /* |
4813 | * walks the btree of allocated extents and find a hole of a given size. | |
4814 | * The key ins is changed to record the hole: | |
4815 | * ins->objectid == block start | |
62e2749e | 4816 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
4817 | * ins->offset == number of blocks |
4818 | * Any available blocks before search_start are skipped. | |
4819 | */ | |
d397712b | 4820 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
4821 | struct btrfs_root *orig_root, |
4822 | u64 num_bytes, u64 empty_size, | |
4823 | u64 search_start, u64 search_end, | |
4824 | u64 hint_byte, struct btrfs_key *ins, | |
98ed5174 | 4825 | int data) |
fec577fb | 4826 | { |
80eb234a | 4827 | int ret = 0; |
d397712b | 4828 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 4829 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 4830 | struct btrfs_block_group_cache *block_group = NULL; |
239b14b3 | 4831 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 4832 | int allowed_chunk_alloc = 0; |
ccf0e725 | 4833 | int done_chunk_alloc = 0; |
80eb234a | 4834 | struct btrfs_space_info *space_info; |
fa9c0d79 CM |
4835 | int last_ptr_loop = 0; |
4836 | int loop = 0; | |
f0486c68 | 4837 | int index = 0; |
817d52f8 | 4838 | bool found_uncached_bg = false; |
0a24325e | 4839 | bool failed_cluster_refill = false; |
1cdda9b8 | 4840 | bool failed_alloc = false; |
67377734 | 4841 | bool use_cluster = true; |
ccf0e725 JB |
4842 | u64 ideal_cache_percent = 0; |
4843 | u64 ideal_cache_offset = 0; | |
fec577fb | 4844 | |
db94535d | 4845 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 4846 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
4847 | ins->objectid = 0; |
4848 | ins->offset = 0; | |
b1a4d965 | 4849 | |
2552d17e | 4850 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 JB |
4851 | if (!space_info) { |
4852 | printk(KERN_ERR "No space info for %d\n", data); | |
4853 | return -ENOSPC; | |
4854 | } | |
2552d17e | 4855 | |
67377734 JB |
4856 | /* |
4857 | * If the space info is for both data and metadata it means we have a | |
4858 | * small filesystem and we can't use the clustering stuff. | |
4859 | */ | |
4860 | if (btrfs_mixed_space_info(space_info)) | |
4861 | use_cluster = false; | |
4862 | ||
0ef3e66b CM |
4863 | if (orig_root->ref_cows || empty_size) |
4864 | allowed_chunk_alloc = 1; | |
4865 | ||
67377734 | 4866 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 4867 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
4868 | if (!btrfs_test_opt(root, SSD)) |
4869 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
4870 | } |
4871 | ||
67377734 JB |
4872 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
4873 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
4874 | last_ptr = &root->fs_info->data_alloc_cluster; |
4875 | } | |
0f9dd46c | 4876 | |
239b14b3 | 4877 | if (last_ptr) { |
fa9c0d79 CM |
4878 | spin_lock(&last_ptr->lock); |
4879 | if (last_ptr->block_group) | |
4880 | hint_byte = last_ptr->window_start; | |
4881 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 4882 | } |
fa9c0d79 | 4883 | |
a061fc8d | 4884 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 4885 | search_start = max(search_start, hint_byte); |
0b86a832 | 4886 | |
817d52f8 | 4887 | if (!last_ptr) |
fa9c0d79 | 4888 | empty_cluster = 0; |
fa9c0d79 | 4889 | |
2552d17e | 4890 | if (search_start == hint_byte) { |
ccf0e725 | 4891 | ideal_cache: |
2552d17e JB |
4892 | block_group = btrfs_lookup_block_group(root->fs_info, |
4893 | search_start); | |
817d52f8 JB |
4894 | /* |
4895 | * we don't want to use the block group if it doesn't match our | |
4896 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
4897 | * |
4898 | * However if we are re-searching with an ideal block group | |
4899 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
4900 | */ |
4901 | if (block_group && block_group_bits(block_group, data) && | |
ccf0e725 JB |
4902 | (block_group->cached != BTRFS_CACHE_NO || |
4903 | search_start == ideal_cache_offset)) { | |
2552d17e | 4904 | down_read(&space_info->groups_sem); |
44fb5511 CM |
4905 | if (list_empty(&block_group->list) || |
4906 | block_group->ro) { | |
4907 | /* | |
4908 | * someone is removing this block group, | |
4909 | * we can't jump into the have_block_group | |
4910 | * target because our list pointers are not | |
4911 | * valid | |
4912 | */ | |
4913 | btrfs_put_block_group(block_group); | |
4914 | up_read(&space_info->groups_sem); | |
ccf0e725 | 4915 | } else { |
b742bb82 | 4916 | index = get_block_group_index(block_group); |
44fb5511 | 4917 | goto have_block_group; |
ccf0e725 | 4918 | } |
2552d17e | 4919 | } else if (block_group) { |
fa9c0d79 | 4920 | btrfs_put_block_group(block_group); |
2552d17e | 4921 | } |
42e70e7a | 4922 | } |
2552d17e | 4923 | search: |
80eb234a | 4924 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
4925 | list_for_each_entry(block_group, &space_info->block_groups[index], |
4926 | list) { | |
6226cb0a | 4927 | u64 offset; |
817d52f8 | 4928 | int cached; |
8a1413a2 | 4929 | |
11dfe35a | 4930 | btrfs_get_block_group(block_group); |
2552d17e | 4931 | search_start = block_group->key.objectid; |
42e70e7a | 4932 | |
2552d17e | 4933 | have_block_group: |
817d52f8 | 4934 | if (unlikely(block_group->cached == BTRFS_CACHE_NO)) { |
ccf0e725 JB |
4935 | u64 free_percent; |
4936 | ||
9d66e233 JB |
4937 | ret = cache_block_group(block_group, trans, 1); |
4938 | if (block_group->cached == BTRFS_CACHE_FINISHED) | |
4939 | goto have_block_group; | |
4940 | ||
ccf0e725 JB |
4941 | free_percent = btrfs_block_group_used(&block_group->item); |
4942 | free_percent *= 100; | |
4943 | free_percent = div64_u64(free_percent, | |
4944 | block_group->key.offset); | |
4945 | free_percent = 100 - free_percent; | |
4946 | if (free_percent > ideal_cache_percent && | |
4947 | likely(!block_group->ro)) { | |
4948 | ideal_cache_offset = block_group->key.objectid; | |
4949 | ideal_cache_percent = free_percent; | |
4950 | } | |
4951 | ||
817d52f8 | 4952 | /* |
ccf0e725 JB |
4953 | * We only want to start kthread caching if we are at |
4954 | * the point where we will wait for caching to make | |
4955 | * progress, or if our ideal search is over and we've | |
4956 | * found somebody to start caching. | |
817d52f8 JB |
4957 | */ |
4958 | if (loop > LOOP_CACHING_NOWAIT || | |
ccf0e725 JB |
4959 | (loop > LOOP_FIND_IDEAL && |
4960 | atomic_read(&space_info->caching_threads) < 2)) { | |
9d66e233 | 4961 | ret = cache_block_group(block_group, trans, 0); |
817d52f8 | 4962 | BUG_ON(ret); |
2552d17e | 4963 | } |
817d52f8 JB |
4964 | found_uncached_bg = true; |
4965 | ||
ccf0e725 JB |
4966 | /* |
4967 | * If loop is set for cached only, try the next block | |
4968 | * group. | |
4969 | */ | |
4970 | if (loop == LOOP_FIND_IDEAL) | |
817d52f8 JB |
4971 | goto loop; |
4972 | } | |
4973 | ||
ccf0e725 JB |
4974 | cached = block_group_cache_done(block_group); |
4975 | if (unlikely(!cached)) | |
4976 | found_uncached_bg = true; | |
4977 | ||
ea6a478e | 4978 | if (unlikely(block_group->ro)) |
2552d17e | 4979 | goto loop; |
0f9dd46c | 4980 | |
0a24325e JB |
4981 | /* |
4982 | * Ok we want to try and use the cluster allocator, so lets look | |
4983 | * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will | |
4984 | * have tried the cluster allocator plenty of times at this | |
4985 | * point and not have found anything, so we are likely way too | |
4986 | * fragmented for the clustering stuff to find anything, so lets | |
4987 | * just skip it and let the allocator find whatever block it can | |
4988 | * find | |
4989 | */ | |
4990 | if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) { | |
fa9c0d79 CM |
4991 | /* |
4992 | * the refill lock keeps out other | |
4993 | * people trying to start a new cluster | |
4994 | */ | |
4995 | spin_lock(&last_ptr->refill_lock); | |
44fb5511 CM |
4996 | if (last_ptr->block_group && |
4997 | (last_ptr->block_group->ro || | |
4998 | !block_group_bits(last_ptr->block_group, data))) { | |
4999 | offset = 0; | |
5000 | goto refill_cluster; | |
5001 | } | |
5002 | ||
fa9c0d79 CM |
5003 | offset = btrfs_alloc_from_cluster(block_group, last_ptr, |
5004 | num_bytes, search_start); | |
5005 | if (offset) { | |
5006 | /* we have a block, we're done */ | |
5007 | spin_unlock(&last_ptr->refill_lock); | |
5008 | goto checks; | |
5009 | } | |
5010 | ||
5011 | spin_lock(&last_ptr->lock); | |
5012 | /* | |
5013 | * whoops, this cluster doesn't actually point to | |
5014 | * this block group. Get a ref on the block | |
5015 | * group is does point to and try again | |
5016 | */ | |
5017 | if (!last_ptr_loop && last_ptr->block_group && | |
5018 | last_ptr->block_group != block_group) { | |
5019 | ||
5020 | btrfs_put_block_group(block_group); | |
5021 | block_group = last_ptr->block_group; | |
11dfe35a | 5022 | btrfs_get_block_group(block_group); |
fa9c0d79 CM |
5023 | spin_unlock(&last_ptr->lock); |
5024 | spin_unlock(&last_ptr->refill_lock); | |
5025 | ||
5026 | last_ptr_loop = 1; | |
5027 | search_start = block_group->key.objectid; | |
44fb5511 CM |
5028 | /* |
5029 | * we know this block group is properly | |
5030 | * in the list because | |
5031 | * btrfs_remove_block_group, drops the | |
5032 | * cluster before it removes the block | |
5033 | * group from the list | |
5034 | */ | |
fa9c0d79 CM |
5035 | goto have_block_group; |
5036 | } | |
5037 | spin_unlock(&last_ptr->lock); | |
44fb5511 | 5038 | refill_cluster: |
fa9c0d79 CM |
5039 | /* |
5040 | * this cluster didn't work out, free it and | |
5041 | * start over | |
5042 | */ | |
5043 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
5044 | ||
5045 | last_ptr_loop = 0; | |
5046 | ||
5047 | /* allocate a cluster in this block group */ | |
451d7585 | 5048 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 CM |
5049 | block_group, last_ptr, |
5050 | offset, num_bytes, | |
5051 | empty_cluster + empty_size); | |
5052 | if (ret == 0) { | |
5053 | /* | |
5054 | * now pull our allocation out of this | |
5055 | * cluster | |
5056 | */ | |
5057 | offset = btrfs_alloc_from_cluster(block_group, | |
5058 | last_ptr, num_bytes, | |
5059 | search_start); | |
5060 | if (offset) { | |
5061 | /* we found one, proceed */ | |
5062 | spin_unlock(&last_ptr->refill_lock); | |
5063 | goto checks; | |
5064 | } | |
0a24325e JB |
5065 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
5066 | && !failed_cluster_refill) { | |
817d52f8 JB |
5067 | spin_unlock(&last_ptr->refill_lock); |
5068 | ||
0a24325e | 5069 | failed_cluster_refill = true; |
817d52f8 JB |
5070 | wait_block_group_cache_progress(block_group, |
5071 | num_bytes + empty_cluster + empty_size); | |
5072 | goto have_block_group; | |
fa9c0d79 | 5073 | } |
817d52f8 | 5074 | |
fa9c0d79 CM |
5075 | /* |
5076 | * at this point we either didn't find a cluster | |
5077 | * or we weren't able to allocate a block from our | |
5078 | * cluster. Free the cluster we've been trying | |
5079 | * to use, and go to the next block group | |
5080 | */ | |
0a24325e | 5081 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 5082 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 5083 | goto loop; |
fa9c0d79 CM |
5084 | } |
5085 | ||
6226cb0a JB |
5086 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
5087 | num_bytes, empty_size); | |
1cdda9b8 JB |
5088 | /* |
5089 | * If we didn't find a chunk, and we haven't failed on this | |
5090 | * block group before, and this block group is in the middle of | |
5091 | * caching and we are ok with waiting, then go ahead and wait | |
5092 | * for progress to be made, and set failed_alloc to true. | |
5093 | * | |
5094 | * If failed_alloc is true then we've already waited on this | |
5095 | * block group once and should move on to the next block group. | |
5096 | */ | |
5097 | if (!offset && !failed_alloc && !cached && | |
5098 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 5099 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
5100 | num_bytes + empty_size); |
5101 | failed_alloc = true; | |
817d52f8 | 5102 | goto have_block_group; |
1cdda9b8 JB |
5103 | } else if (!offset) { |
5104 | goto loop; | |
817d52f8 | 5105 | } |
fa9c0d79 | 5106 | checks: |
6226cb0a | 5107 | search_start = stripe_align(root, offset); |
2552d17e | 5108 | /* move on to the next group */ |
6226cb0a JB |
5109 | if (search_start + num_bytes >= search_end) { |
5110 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5111 | goto loop; |
6226cb0a | 5112 | } |
25179201 | 5113 | |
2552d17e JB |
5114 | /* move on to the next group */ |
5115 | if (search_start + num_bytes > | |
6226cb0a JB |
5116 | block_group->key.objectid + block_group->key.offset) { |
5117 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5118 | goto loop; |
6226cb0a | 5119 | } |
f5a31e16 | 5120 | |
f0486c68 YZ |
5121 | ins->objectid = search_start; |
5122 | ins->offset = num_bytes; | |
2552d17e | 5123 | |
f0486c68 YZ |
5124 | if (offset < search_start) |
5125 | btrfs_add_free_space(block_group, offset, | |
5126 | search_start - offset); | |
5127 | BUG_ON(offset > search_start); | |
2552d17e | 5128 | |
f0486c68 YZ |
5129 | ret = update_reserved_bytes(block_group, num_bytes, 1, |
5130 | (data & BTRFS_BLOCK_GROUP_DATA)); | |
5131 | if (ret == -EAGAIN) { | |
6226cb0a | 5132 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 5133 | goto loop; |
0f9dd46c | 5134 | } |
0b86a832 | 5135 | |
f0486c68 | 5136 | /* we are all good, lets return */ |
2552d17e JB |
5137 | ins->objectid = search_start; |
5138 | ins->offset = num_bytes; | |
d2fb3437 | 5139 | |
6226cb0a JB |
5140 | if (offset < search_start) |
5141 | btrfs_add_free_space(block_group, offset, | |
5142 | search_start - offset); | |
5143 | BUG_ON(offset > search_start); | |
2552d17e JB |
5144 | break; |
5145 | loop: | |
0a24325e | 5146 | failed_cluster_refill = false; |
1cdda9b8 | 5147 | failed_alloc = false; |
b742bb82 | 5148 | BUG_ON(index != get_block_group_index(block_group)); |
fa9c0d79 | 5149 | btrfs_put_block_group(block_group); |
2552d17e JB |
5150 | } |
5151 | up_read(&space_info->groups_sem); | |
5152 | ||
b742bb82 YZ |
5153 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
5154 | goto search; | |
5155 | ||
ccf0e725 JB |
5156 | /* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for |
5157 | * for them to make caching progress. Also | |
5158 | * determine the best possible bg to cache | |
5159 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
5160 | * caching kthreads as we move along | |
817d52f8 JB |
5161 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
5162 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
5163 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
5164 | * again | |
fa9c0d79 | 5165 | */ |
817d52f8 JB |
5166 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE && |
5167 | (found_uncached_bg || empty_size || empty_cluster || | |
5168 | allowed_chunk_alloc)) { | |
b742bb82 | 5169 | index = 0; |
ccf0e725 | 5170 | if (loop == LOOP_FIND_IDEAL && found_uncached_bg) { |
817d52f8 | 5171 | found_uncached_bg = false; |
ccf0e725 JB |
5172 | loop++; |
5173 | if (!ideal_cache_percent && | |
5174 | atomic_read(&space_info->caching_threads)) | |
817d52f8 | 5175 | goto search; |
ccf0e725 JB |
5176 | |
5177 | /* | |
5178 | * 1 of the following 2 things have happened so far | |
5179 | * | |
5180 | * 1) We found an ideal block group for caching that | |
5181 | * is mostly full and will cache quickly, so we might | |
5182 | * as well wait for it. | |
5183 | * | |
5184 | * 2) We searched for cached only and we didn't find | |
5185 | * anything, and we didn't start any caching kthreads | |
5186 | * either, so chances are we will loop through and | |
5187 | * start a couple caching kthreads, and then come back | |
5188 | * around and just wait for them. This will be slower | |
5189 | * because we will have 2 caching kthreads reading at | |
5190 | * the same time when we could have just started one | |
5191 | * and waited for it to get far enough to give us an | |
5192 | * allocation, so go ahead and go to the wait caching | |
5193 | * loop. | |
5194 | */ | |
5195 | loop = LOOP_CACHING_WAIT; | |
5196 | search_start = ideal_cache_offset; | |
5197 | ideal_cache_percent = 0; | |
5198 | goto ideal_cache; | |
5199 | } else if (loop == LOOP_FIND_IDEAL) { | |
5200 | /* | |
5201 | * Didn't find a uncached bg, wait on anything we find | |
5202 | * next. | |
5203 | */ | |
5204 | loop = LOOP_CACHING_WAIT; | |
5205 | goto search; | |
5206 | } | |
5207 | ||
5208 | if (loop < LOOP_CACHING_WAIT) { | |
5209 | loop++; | |
5210 | goto search; | |
817d52f8 JB |
5211 | } |
5212 | ||
5213 | if (loop == LOOP_ALLOC_CHUNK) { | |
fa9c0d79 CM |
5214 | empty_size = 0; |
5215 | empty_cluster = 0; | |
5216 | } | |
2552d17e JB |
5217 | |
5218 | if (allowed_chunk_alloc) { | |
5219 | ret = do_chunk_alloc(trans, root, num_bytes + | |
5220 | 2 * 1024 * 1024, data, 1); | |
2552d17e | 5221 | allowed_chunk_alloc = 0; |
ccf0e725 JB |
5222 | done_chunk_alloc = 1; |
5223 | } else if (!done_chunk_alloc) { | |
2552d17e JB |
5224 | space_info->force_alloc = 1; |
5225 | } | |
5226 | ||
817d52f8 | 5227 | if (loop < LOOP_NO_EMPTY_SIZE) { |
fa9c0d79 | 5228 | loop++; |
2552d17e | 5229 | goto search; |
fa9c0d79 | 5230 | } |
2552d17e JB |
5231 | ret = -ENOSPC; |
5232 | } else if (!ins->objectid) { | |
5233 | ret = -ENOSPC; | |
f2654de4 | 5234 | } |
0b86a832 | 5235 | |
80eb234a JB |
5236 | /* we found what we needed */ |
5237 | if (ins->objectid) { | |
5238 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
d2fb3437 | 5239 | trans->block_group = block_group->key.objectid; |
0f9dd46c | 5240 | |
fa9c0d79 | 5241 | btrfs_put_block_group(block_group); |
80eb234a | 5242 | ret = 0; |
be744175 | 5243 | } |
be744175 | 5244 | |
0f70abe2 | 5245 | return ret; |
fec577fb | 5246 | } |
ec44a35c | 5247 | |
9ed74f2d JB |
5248 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
5249 | int dump_block_groups) | |
0f9dd46c JB |
5250 | { |
5251 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 5252 | int index = 0; |
0f9dd46c | 5253 | |
9ed74f2d | 5254 | spin_lock(&info->lock); |
d397712b CM |
5255 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
5256 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
9ed74f2d | 5257 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 5258 | info->bytes_readonly), |
d397712b | 5259 | (info->full) ? "" : "not "); |
8929ecfa YZ |
5260 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
5261 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 5262 | (unsigned long long)info->total_bytes, |
8929ecfa | 5263 | (unsigned long long)info->bytes_used, |
21380931 | 5264 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 5265 | (unsigned long long)info->bytes_reserved, |
21380931 | 5266 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 5267 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
5268 | spin_unlock(&info->lock); |
5269 | ||
5270 | if (!dump_block_groups) | |
5271 | return; | |
0f9dd46c | 5272 | |
80eb234a | 5273 | down_read(&info->groups_sem); |
b742bb82 YZ |
5274 | again: |
5275 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 5276 | spin_lock(&cache->lock); |
d397712b CM |
5277 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
5278 | "%llu pinned %llu reserved\n", | |
5279 | (unsigned long long)cache->key.objectid, | |
5280 | (unsigned long long)cache->key.offset, | |
5281 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
5282 | (unsigned long long)cache->pinned, | |
5283 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
5284 | btrfs_dump_free_space(cache, bytes); |
5285 | spin_unlock(&cache->lock); | |
5286 | } | |
b742bb82 YZ |
5287 | if (++index < BTRFS_NR_RAID_TYPES) |
5288 | goto again; | |
80eb234a | 5289 | up_read(&info->groups_sem); |
0f9dd46c | 5290 | } |
e8569813 | 5291 | |
11833d66 YZ |
5292 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
5293 | struct btrfs_root *root, | |
5294 | u64 num_bytes, u64 min_alloc_size, | |
5295 | u64 empty_size, u64 hint_byte, | |
5296 | u64 search_end, struct btrfs_key *ins, | |
5297 | u64 data) | |
fec577fb CM |
5298 | { |
5299 | int ret; | |
fbdc762b | 5300 | u64 search_start = 0; |
925baedd | 5301 | |
6a63209f | 5302 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 5303 | again: |
0ef3e66b CM |
5304 | /* |
5305 | * the only place that sets empty_size is btrfs_realloc_node, which | |
5306 | * is not called recursively on allocations | |
5307 | */ | |
83d3c969 | 5308 | if (empty_size || root->ref_cows) |
6324fbf3 | 5309 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b | 5310 | num_bytes + 2 * 1024 * 1024, data, 0); |
0b86a832 | 5311 | |
db94535d CM |
5312 | WARN_ON(num_bytes < root->sectorsize); |
5313 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
f0486c68 YZ |
5314 | search_start, search_end, hint_byte, |
5315 | ins, data); | |
3b951516 | 5316 | |
98d20f67 CM |
5317 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
5318 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 5319 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 5320 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
5321 | do_chunk_alloc(trans, root->fs_info->extent_root, |
5322 | num_bytes, data, 1); | |
98d20f67 CM |
5323 | goto again; |
5324 | } | |
817d52f8 | 5325 | if (ret == -ENOSPC) { |
0f9dd46c JB |
5326 | struct btrfs_space_info *sinfo; |
5327 | ||
5328 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
5329 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
5330 | "wanted %llu\n", (unsigned long long)data, | |
5331 | (unsigned long long)num_bytes); | |
9ed74f2d | 5332 | dump_space_info(sinfo, num_bytes, 1); |
925baedd | 5333 | } |
0f9dd46c JB |
5334 | |
5335 | return ret; | |
e6dcd2dc CM |
5336 | } |
5337 | ||
65b51a00 CM |
5338 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
5339 | { | |
0f9dd46c | 5340 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 5341 | int ret = 0; |
0f9dd46c | 5342 | |
0f9dd46c JB |
5343 | cache = btrfs_lookup_block_group(root->fs_info, start); |
5344 | if (!cache) { | |
d397712b CM |
5345 | printk(KERN_ERR "Unable to find block group for %llu\n", |
5346 | (unsigned long long)start); | |
0f9dd46c JB |
5347 | return -ENOSPC; |
5348 | } | |
1f3c79a2 LH |
5349 | |
5350 | ret = btrfs_discard_extent(root, start, len); | |
5351 | ||
0f9dd46c | 5352 | btrfs_add_free_space(cache, start, len); |
f0486c68 | 5353 | update_reserved_bytes(cache, len, 0, 1); |
fa9c0d79 | 5354 | btrfs_put_block_group(cache); |
817d52f8 | 5355 | |
e6dcd2dc CM |
5356 | return ret; |
5357 | } | |
5358 | ||
5d4f98a2 YZ |
5359 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
5360 | struct btrfs_root *root, | |
5361 | u64 parent, u64 root_objectid, | |
5362 | u64 flags, u64 owner, u64 offset, | |
5363 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
5364 | { |
5365 | int ret; | |
5d4f98a2 | 5366 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 5367 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 5368 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 5369 | struct btrfs_path *path; |
5d4f98a2 YZ |
5370 | struct extent_buffer *leaf; |
5371 | int type; | |
5372 | u32 size; | |
26b8003f | 5373 | |
5d4f98a2 YZ |
5374 | if (parent > 0) |
5375 | type = BTRFS_SHARED_DATA_REF_KEY; | |
5376 | else | |
5377 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 5378 | |
5d4f98a2 | 5379 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
5380 | |
5381 | path = btrfs_alloc_path(); | |
5382 | BUG_ON(!path); | |
47e4bb98 | 5383 | |
b9473439 | 5384 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5385 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
5386 | ins, size); | |
ccd467d6 | 5387 | BUG_ON(ret); |
0f9dd46c | 5388 | |
5d4f98a2 YZ |
5389 | leaf = path->nodes[0]; |
5390 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 5391 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5392 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
5393 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5394 | btrfs_set_extent_flags(leaf, extent_item, | |
5395 | flags | BTRFS_EXTENT_FLAG_DATA); | |
5396 | ||
5397 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
5398 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
5399 | if (parent > 0) { | |
5400 | struct btrfs_shared_data_ref *ref; | |
5401 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
5402 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5403 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
5404 | } else { | |
5405 | struct btrfs_extent_data_ref *ref; | |
5406 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
5407 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
5408 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
5409 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
5410 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
5411 | } | |
47e4bb98 CM |
5412 | |
5413 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 5414 | btrfs_free_path(path); |
f510cfec | 5415 | |
f0486c68 | 5416 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
f5947066 | 5417 | if (ret) { |
d397712b CM |
5418 | printk(KERN_ERR "btrfs update block group failed for %llu " |
5419 | "%llu\n", (unsigned long long)ins->objectid, | |
5420 | (unsigned long long)ins->offset); | |
f5947066 CM |
5421 | BUG(); |
5422 | } | |
e6dcd2dc CM |
5423 | return ret; |
5424 | } | |
5425 | ||
5d4f98a2 YZ |
5426 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
5427 | struct btrfs_root *root, | |
5428 | u64 parent, u64 root_objectid, | |
5429 | u64 flags, struct btrfs_disk_key *key, | |
5430 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
5431 | { |
5432 | int ret; | |
5d4f98a2 YZ |
5433 | struct btrfs_fs_info *fs_info = root->fs_info; |
5434 | struct btrfs_extent_item *extent_item; | |
5435 | struct btrfs_tree_block_info *block_info; | |
5436 | struct btrfs_extent_inline_ref *iref; | |
5437 | struct btrfs_path *path; | |
5438 | struct extent_buffer *leaf; | |
5439 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 5440 | |
5d4f98a2 YZ |
5441 | path = btrfs_alloc_path(); |
5442 | BUG_ON(!path); | |
56bec294 | 5443 | |
5d4f98a2 YZ |
5444 | path->leave_spinning = 1; |
5445 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
5446 | ins, size); | |
56bec294 | 5447 | BUG_ON(ret); |
5d4f98a2 YZ |
5448 | |
5449 | leaf = path->nodes[0]; | |
5450 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
5451 | struct btrfs_extent_item); | |
5452 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
5453 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5454 | btrfs_set_extent_flags(leaf, extent_item, | |
5455 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5456 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
5457 | ||
5458 | btrfs_set_tree_block_key(leaf, block_info, key); | |
5459 | btrfs_set_tree_block_level(leaf, block_info, level); | |
5460 | ||
5461 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
5462 | if (parent > 0) { | |
5463 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
5464 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5465 | BTRFS_SHARED_BLOCK_REF_KEY); | |
5466 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5467 | } else { | |
5468 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5469 | BTRFS_TREE_BLOCK_REF_KEY); | |
5470 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
5471 | } | |
5472 | ||
5473 | btrfs_mark_buffer_dirty(leaf); | |
5474 | btrfs_free_path(path); | |
5475 | ||
f0486c68 | 5476 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
5d4f98a2 YZ |
5477 | if (ret) { |
5478 | printk(KERN_ERR "btrfs update block group failed for %llu " | |
5479 | "%llu\n", (unsigned long long)ins->objectid, | |
5480 | (unsigned long long)ins->offset); | |
5481 | BUG(); | |
5482 | } | |
5483 | return ret; | |
5484 | } | |
5485 | ||
5486 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
5487 | struct btrfs_root *root, | |
5488 | u64 root_objectid, u64 owner, | |
5489 | u64 offset, struct btrfs_key *ins) | |
5490 | { | |
5491 | int ret; | |
5492 | ||
5493 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
5494 | ||
5495 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, | |
5496 | 0, root_objectid, owner, offset, | |
5497 | BTRFS_ADD_DELAYED_EXTENT, NULL); | |
e6dcd2dc CM |
5498 | return ret; |
5499 | } | |
e02119d5 CM |
5500 | |
5501 | /* | |
5502 | * this is used by the tree logging recovery code. It records that | |
5503 | * an extent has been allocated and makes sure to clear the free | |
5504 | * space cache bits as well | |
5505 | */ | |
5d4f98a2 YZ |
5506 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
5507 | struct btrfs_root *root, | |
5508 | u64 root_objectid, u64 owner, u64 offset, | |
5509 | struct btrfs_key *ins) | |
e02119d5 CM |
5510 | { |
5511 | int ret; | |
5512 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
5513 | struct btrfs_caching_control *caching_ctl; |
5514 | u64 start = ins->objectid; | |
5515 | u64 num_bytes = ins->offset; | |
e02119d5 | 5516 | |
e02119d5 | 5517 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
9d66e233 | 5518 | cache_block_group(block_group, trans, 0); |
11833d66 | 5519 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 5520 | |
11833d66 YZ |
5521 | if (!caching_ctl) { |
5522 | BUG_ON(!block_group_cache_done(block_group)); | |
5523 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5524 | BUG_ON(ret); | |
5525 | } else { | |
5526 | mutex_lock(&caching_ctl->mutex); | |
5527 | ||
5528 | if (start >= caching_ctl->progress) { | |
5529 | ret = add_excluded_extent(root, start, num_bytes); | |
5530 | BUG_ON(ret); | |
5531 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5532 | ret = btrfs_remove_free_space(block_group, | |
5533 | start, num_bytes); | |
5534 | BUG_ON(ret); | |
5535 | } else { | |
5536 | num_bytes = caching_ctl->progress - start; | |
5537 | ret = btrfs_remove_free_space(block_group, | |
5538 | start, num_bytes); | |
5539 | BUG_ON(ret); | |
5540 | ||
5541 | start = caching_ctl->progress; | |
5542 | num_bytes = ins->objectid + ins->offset - | |
5543 | caching_ctl->progress; | |
5544 | ret = add_excluded_extent(root, start, num_bytes); | |
5545 | BUG_ON(ret); | |
5546 | } | |
5547 | ||
5548 | mutex_unlock(&caching_ctl->mutex); | |
5549 | put_caching_control(caching_ctl); | |
5550 | } | |
5551 | ||
f0486c68 YZ |
5552 | ret = update_reserved_bytes(block_group, ins->offset, 1, 1); |
5553 | BUG_ON(ret); | |
fa9c0d79 | 5554 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
5555 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
5556 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
5557 | return ret; |
5558 | } | |
5559 | ||
65b51a00 CM |
5560 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
5561 | struct btrfs_root *root, | |
4008c04a CM |
5562 | u64 bytenr, u32 blocksize, |
5563 | int level) | |
65b51a00 CM |
5564 | { |
5565 | struct extent_buffer *buf; | |
5566 | ||
5567 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
5568 | if (!buf) | |
5569 | return ERR_PTR(-ENOMEM); | |
5570 | btrfs_set_header_generation(buf, trans->transid); | |
4008c04a | 5571 | btrfs_set_buffer_lockdep_class(buf, level); |
65b51a00 CM |
5572 | btrfs_tree_lock(buf); |
5573 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
5574 | |
5575 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 5576 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 5577 | |
d0c803c4 | 5578 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
5579 | /* |
5580 | * we allow two log transactions at a time, use different | |
5581 | * EXENT bit to differentiate dirty pages. | |
5582 | */ | |
5583 | if (root->log_transid % 2 == 0) | |
5584 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
5585 | buf->start + buf->len - 1, GFP_NOFS); | |
5586 | else | |
5587 | set_extent_new(&root->dirty_log_pages, buf->start, | |
5588 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
5589 | } else { |
5590 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 5591 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 5592 | } |
65b51a00 | 5593 | trans->blocks_used++; |
b4ce94de | 5594 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
5595 | return buf; |
5596 | } | |
5597 | ||
f0486c68 YZ |
5598 | static struct btrfs_block_rsv * |
5599 | use_block_rsv(struct btrfs_trans_handle *trans, | |
5600 | struct btrfs_root *root, u32 blocksize) | |
5601 | { | |
5602 | struct btrfs_block_rsv *block_rsv; | |
5603 | int ret; | |
5604 | ||
5605 | block_rsv = get_block_rsv(trans, root); | |
5606 | ||
5607 | if (block_rsv->size == 0) { | |
8bb8ab2e JB |
5608 | ret = reserve_metadata_bytes(trans, root, block_rsv, |
5609 | blocksize, 0); | |
f0486c68 YZ |
5610 | if (ret) |
5611 | return ERR_PTR(ret); | |
5612 | return block_rsv; | |
5613 | } | |
5614 | ||
5615 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
5616 | if (!ret) | |
5617 | return block_rsv; | |
5618 | ||
f0486c68 YZ |
5619 | return ERR_PTR(-ENOSPC); |
5620 | } | |
5621 | ||
5622 | static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
5623 | { | |
5624 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
5625 | block_rsv_release_bytes(block_rsv, NULL, 0); | |
5626 | } | |
5627 | ||
fec577fb | 5628 | /* |
f0486c68 YZ |
5629 | * finds a free extent and does all the dirty work required for allocation |
5630 | * returns the key for the extent through ins, and a tree buffer for | |
5631 | * the first block of the extent through buf. | |
5632 | * | |
fec577fb CM |
5633 | * returns the tree buffer or NULL. |
5634 | */ | |
5f39d397 | 5635 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
5636 | struct btrfs_root *root, u32 blocksize, |
5637 | u64 parent, u64 root_objectid, | |
5638 | struct btrfs_disk_key *key, int level, | |
5639 | u64 hint, u64 empty_size) | |
fec577fb | 5640 | { |
e2fa7227 | 5641 | struct btrfs_key ins; |
f0486c68 | 5642 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 5643 | struct extent_buffer *buf; |
f0486c68 YZ |
5644 | u64 flags = 0; |
5645 | int ret; | |
5646 | ||
fec577fb | 5647 | |
f0486c68 YZ |
5648 | block_rsv = use_block_rsv(trans, root, blocksize); |
5649 | if (IS_ERR(block_rsv)) | |
5650 | return ERR_CAST(block_rsv); | |
5651 | ||
5652 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
5653 | empty_size, hint, (u64)-1, &ins, 0); | |
fec577fb | 5654 | if (ret) { |
f0486c68 | 5655 | unuse_block_rsv(block_rsv, blocksize); |
54aa1f4d | 5656 | return ERR_PTR(ret); |
fec577fb | 5657 | } |
55c69072 | 5658 | |
4008c04a CM |
5659 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
5660 | blocksize, level); | |
f0486c68 YZ |
5661 | BUG_ON(IS_ERR(buf)); |
5662 | ||
5663 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
5664 | if (parent == 0) | |
5665 | parent = ins.objectid; | |
5666 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
5667 | } else | |
5668 | BUG_ON(parent > 0); | |
5669 | ||
5670 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5671 | struct btrfs_delayed_extent_op *extent_op; | |
5672 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
5673 | BUG_ON(!extent_op); | |
5674 | if (key) | |
5675 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
5676 | else | |
5677 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
5678 | extent_op->flags_to_set = flags; | |
5679 | extent_op->update_key = 1; | |
5680 | extent_op->update_flags = 1; | |
5681 | extent_op->is_data = 0; | |
5682 | ||
5683 | ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, | |
5684 | ins.offset, parent, root_objectid, | |
5685 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5686 | extent_op); | |
5687 | BUG_ON(ret); | |
5688 | } | |
fec577fb CM |
5689 | return buf; |
5690 | } | |
a28ec197 | 5691 | |
2c47e605 YZ |
5692 | struct walk_control { |
5693 | u64 refs[BTRFS_MAX_LEVEL]; | |
5694 | u64 flags[BTRFS_MAX_LEVEL]; | |
5695 | struct btrfs_key update_progress; | |
5696 | int stage; | |
5697 | int level; | |
5698 | int shared_level; | |
5699 | int update_ref; | |
5700 | int keep_locks; | |
1c4850e2 YZ |
5701 | int reada_slot; |
5702 | int reada_count; | |
2c47e605 YZ |
5703 | }; |
5704 | ||
5705 | #define DROP_REFERENCE 1 | |
5706 | #define UPDATE_BACKREF 2 | |
5707 | ||
1c4850e2 YZ |
5708 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
5709 | struct btrfs_root *root, | |
5710 | struct walk_control *wc, | |
5711 | struct btrfs_path *path) | |
6407bf6d | 5712 | { |
1c4850e2 YZ |
5713 | u64 bytenr; |
5714 | u64 generation; | |
5715 | u64 refs; | |
94fcca9f | 5716 | u64 flags; |
5d4f98a2 | 5717 | u32 nritems; |
1c4850e2 YZ |
5718 | u32 blocksize; |
5719 | struct btrfs_key key; | |
5720 | struct extent_buffer *eb; | |
6407bf6d | 5721 | int ret; |
1c4850e2 YZ |
5722 | int slot; |
5723 | int nread = 0; | |
6407bf6d | 5724 | |
1c4850e2 YZ |
5725 | if (path->slots[wc->level] < wc->reada_slot) { |
5726 | wc->reada_count = wc->reada_count * 2 / 3; | |
5727 | wc->reada_count = max(wc->reada_count, 2); | |
5728 | } else { | |
5729 | wc->reada_count = wc->reada_count * 3 / 2; | |
5730 | wc->reada_count = min_t(int, wc->reada_count, | |
5731 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
5732 | } | |
7bb86316 | 5733 | |
1c4850e2 YZ |
5734 | eb = path->nodes[wc->level]; |
5735 | nritems = btrfs_header_nritems(eb); | |
5736 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 5737 | |
1c4850e2 YZ |
5738 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
5739 | if (nread >= wc->reada_count) | |
5740 | break; | |
bd56b302 | 5741 | |
2dd3e67b | 5742 | cond_resched(); |
1c4850e2 YZ |
5743 | bytenr = btrfs_node_blockptr(eb, slot); |
5744 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 5745 | |
1c4850e2 YZ |
5746 | if (slot == path->slots[wc->level]) |
5747 | goto reada; | |
5d4f98a2 | 5748 | |
1c4850e2 YZ |
5749 | if (wc->stage == UPDATE_BACKREF && |
5750 | generation <= root->root_key.offset) | |
bd56b302 CM |
5751 | continue; |
5752 | ||
94fcca9f YZ |
5753 | /* We don't lock the tree block, it's OK to be racy here */ |
5754 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
5755 | &refs, &flags); | |
5756 | BUG_ON(ret); | |
5757 | BUG_ON(refs == 0); | |
5758 | ||
1c4850e2 | 5759 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
5760 | if (refs == 1) |
5761 | goto reada; | |
bd56b302 | 5762 | |
94fcca9f YZ |
5763 | if (wc->level == 1 && |
5764 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5765 | continue; | |
1c4850e2 YZ |
5766 | if (!wc->update_ref || |
5767 | generation <= root->root_key.offset) | |
5768 | continue; | |
5769 | btrfs_node_key_to_cpu(eb, &key, slot); | |
5770 | ret = btrfs_comp_cpu_keys(&key, | |
5771 | &wc->update_progress); | |
5772 | if (ret < 0) | |
5773 | continue; | |
94fcca9f YZ |
5774 | } else { |
5775 | if (wc->level == 1 && | |
5776 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5777 | continue; | |
6407bf6d | 5778 | } |
1c4850e2 YZ |
5779 | reada: |
5780 | ret = readahead_tree_block(root, bytenr, blocksize, | |
5781 | generation); | |
5782 | if (ret) | |
bd56b302 | 5783 | break; |
1c4850e2 | 5784 | nread++; |
20524f02 | 5785 | } |
1c4850e2 | 5786 | wc->reada_slot = slot; |
20524f02 | 5787 | } |
2c47e605 | 5788 | |
f82d02d9 | 5789 | /* |
2c47e605 YZ |
5790 | * hepler to process tree block while walking down the tree. |
5791 | * | |
2c47e605 YZ |
5792 | * when wc->stage == UPDATE_BACKREF, this function updates |
5793 | * back refs for pointers in the block. | |
5794 | * | |
5795 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 5796 | */ |
2c47e605 | 5797 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 5798 | struct btrfs_root *root, |
2c47e605 | 5799 | struct btrfs_path *path, |
94fcca9f | 5800 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 5801 | { |
2c47e605 YZ |
5802 | int level = wc->level; |
5803 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 5804 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
5805 | int ret; |
5806 | ||
2c47e605 YZ |
5807 | if (wc->stage == UPDATE_BACKREF && |
5808 | btrfs_header_owner(eb) != root->root_key.objectid) | |
5809 | return 1; | |
f82d02d9 | 5810 | |
2c47e605 YZ |
5811 | /* |
5812 | * when reference count of tree block is 1, it won't increase | |
5813 | * again. once full backref flag is set, we never clear it. | |
5814 | */ | |
94fcca9f YZ |
5815 | if (lookup_info && |
5816 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
5817 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
5818 | BUG_ON(!path->locks[level]); |
5819 | ret = btrfs_lookup_extent_info(trans, root, | |
5820 | eb->start, eb->len, | |
5821 | &wc->refs[level], | |
5822 | &wc->flags[level]); | |
5823 | BUG_ON(ret); | |
5824 | BUG_ON(wc->refs[level] == 0); | |
5825 | } | |
5d4f98a2 | 5826 | |
2c47e605 YZ |
5827 | if (wc->stage == DROP_REFERENCE) { |
5828 | if (wc->refs[level] > 1) | |
5829 | return 1; | |
f82d02d9 | 5830 | |
2c47e605 YZ |
5831 | if (path->locks[level] && !wc->keep_locks) { |
5832 | btrfs_tree_unlock(eb); | |
5833 | path->locks[level] = 0; | |
5834 | } | |
5835 | return 0; | |
5836 | } | |
f82d02d9 | 5837 | |
2c47e605 YZ |
5838 | /* wc->stage == UPDATE_BACKREF */ |
5839 | if (!(wc->flags[level] & flag)) { | |
5840 | BUG_ON(!path->locks[level]); | |
5841 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
f82d02d9 | 5842 | BUG_ON(ret); |
2c47e605 YZ |
5843 | ret = btrfs_dec_ref(trans, root, eb, 0); |
5844 | BUG_ON(ret); | |
5845 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
5846 | eb->len, flag, 0); | |
5847 | BUG_ON(ret); | |
5848 | wc->flags[level] |= flag; | |
5849 | } | |
5850 | ||
5851 | /* | |
5852 | * the block is shared by multiple trees, so it's not good to | |
5853 | * keep the tree lock | |
5854 | */ | |
5855 | if (path->locks[level] && level > 0) { | |
5856 | btrfs_tree_unlock(eb); | |
5857 | path->locks[level] = 0; | |
5858 | } | |
5859 | return 0; | |
5860 | } | |
5861 | ||
1c4850e2 YZ |
5862 | /* |
5863 | * hepler to process tree block pointer. | |
5864 | * | |
5865 | * when wc->stage == DROP_REFERENCE, this function checks | |
5866 | * reference count of the block pointed to. if the block | |
5867 | * is shared and we need update back refs for the subtree | |
5868 | * rooted at the block, this function changes wc->stage to | |
5869 | * UPDATE_BACKREF. if the block is shared and there is no | |
5870 | * need to update back, this function drops the reference | |
5871 | * to the block. | |
5872 | * | |
5873 | * NOTE: return value 1 means we should stop walking down. | |
5874 | */ | |
5875 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
5876 | struct btrfs_root *root, | |
5877 | struct btrfs_path *path, | |
94fcca9f | 5878 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
5879 | { |
5880 | u64 bytenr; | |
5881 | u64 generation; | |
5882 | u64 parent; | |
5883 | u32 blocksize; | |
5884 | struct btrfs_key key; | |
5885 | struct extent_buffer *next; | |
5886 | int level = wc->level; | |
5887 | int reada = 0; | |
5888 | int ret = 0; | |
5889 | ||
5890 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
5891 | path->slots[level]); | |
5892 | /* | |
5893 | * if the lower level block was created before the snapshot | |
5894 | * was created, we know there is no need to update back refs | |
5895 | * for the subtree | |
5896 | */ | |
5897 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
5898 | generation <= root->root_key.offset) { |
5899 | *lookup_info = 1; | |
1c4850e2 | 5900 | return 1; |
94fcca9f | 5901 | } |
1c4850e2 YZ |
5902 | |
5903 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
5904 | blocksize = btrfs_level_size(root, level - 1); | |
5905 | ||
5906 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
5907 | if (!next) { | |
5908 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
5909 | if (!next) |
5910 | return -ENOMEM; | |
1c4850e2 YZ |
5911 | reada = 1; |
5912 | } | |
5913 | btrfs_tree_lock(next); | |
5914 | btrfs_set_lock_blocking(next); | |
5915 | ||
94fcca9f YZ |
5916 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
5917 | &wc->refs[level - 1], | |
5918 | &wc->flags[level - 1]); | |
5919 | BUG_ON(ret); | |
5920 | BUG_ON(wc->refs[level - 1] == 0); | |
5921 | *lookup_info = 0; | |
1c4850e2 | 5922 | |
94fcca9f | 5923 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 5924 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
5925 | if (level == 1 && |
5926 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5927 | goto skip; | |
5928 | ||
1c4850e2 YZ |
5929 | if (!wc->update_ref || |
5930 | generation <= root->root_key.offset) | |
5931 | goto skip; | |
5932 | ||
5933 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
5934 | path->slots[level]); | |
5935 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
5936 | if (ret < 0) | |
5937 | goto skip; | |
5938 | ||
5939 | wc->stage = UPDATE_BACKREF; | |
5940 | wc->shared_level = level - 1; | |
5941 | } | |
94fcca9f YZ |
5942 | } else { |
5943 | if (level == 1 && | |
5944 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5945 | goto skip; | |
1c4850e2 YZ |
5946 | } |
5947 | ||
5948 | if (!btrfs_buffer_uptodate(next, generation)) { | |
5949 | btrfs_tree_unlock(next); | |
5950 | free_extent_buffer(next); | |
5951 | next = NULL; | |
94fcca9f | 5952 | *lookup_info = 1; |
1c4850e2 YZ |
5953 | } |
5954 | ||
5955 | if (!next) { | |
5956 | if (reada && level == 1) | |
5957 | reada_walk_down(trans, root, wc, path); | |
5958 | next = read_tree_block(root, bytenr, blocksize, generation); | |
5959 | btrfs_tree_lock(next); | |
5960 | btrfs_set_lock_blocking(next); | |
5961 | } | |
5962 | ||
5963 | level--; | |
5964 | BUG_ON(level != btrfs_header_level(next)); | |
5965 | path->nodes[level] = next; | |
5966 | path->slots[level] = 0; | |
5967 | path->locks[level] = 1; | |
5968 | wc->level = level; | |
5969 | if (wc->level == 1) | |
5970 | wc->reada_slot = 0; | |
5971 | return 0; | |
5972 | skip: | |
5973 | wc->refs[level - 1] = 0; | |
5974 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
5975 | if (wc->stage == DROP_REFERENCE) { |
5976 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
5977 | parent = path->nodes[level]->start; | |
5978 | } else { | |
5979 | BUG_ON(root->root_key.objectid != | |
5980 | btrfs_header_owner(path->nodes[level])); | |
5981 | parent = 0; | |
5982 | } | |
1c4850e2 | 5983 | |
94fcca9f YZ |
5984 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
5985 | root->root_key.objectid, level - 1, 0); | |
5986 | BUG_ON(ret); | |
1c4850e2 | 5987 | } |
1c4850e2 YZ |
5988 | btrfs_tree_unlock(next); |
5989 | free_extent_buffer(next); | |
94fcca9f | 5990 | *lookup_info = 1; |
1c4850e2 YZ |
5991 | return 1; |
5992 | } | |
5993 | ||
2c47e605 YZ |
5994 | /* |
5995 | * hepler to process tree block while walking up the tree. | |
5996 | * | |
5997 | * when wc->stage == DROP_REFERENCE, this function drops | |
5998 | * reference count on the block. | |
5999 | * | |
6000 | * when wc->stage == UPDATE_BACKREF, this function changes | |
6001 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
6002 | * to UPDATE_BACKREF previously while processing the block. | |
6003 | * | |
6004 | * NOTE: return value 1 means we should stop walking up. | |
6005 | */ | |
6006 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
6007 | struct btrfs_root *root, | |
6008 | struct btrfs_path *path, | |
6009 | struct walk_control *wc) | |
6010 | { | |
f0486c68 | 6011 | int ret; |
2c47e605 YZ |
6012 | int level = wc->level; |
6013 | struct extent_buffer *eb = path->nodes[level]; | |
6014 | u64 parent = 0; | |
6015 | ||
6016 | if (wc->stage == UPDATE_BACKREF) { | |
6017 | BUG_ON(wc->shared_level < level); | |
6018 | if (level < wc->shared_level) | |
6019 | goto out; | |
6020 | ||
2c47e605 YZ |
6021 | ret = find_next_key(path, level + 1, &wc->update_progress); |
6022 | if (ret > 0) | |
6023 | wc->update_ref = 0; | |
6024 | ||
6025 | wc->stage = DROP_REFERENCE; | |
6026 | wc->shared_level = -1; | |
6027 | path->slots[level] = 0; | |
6028 | ||
6029 | /* | |
6030 | * check reference count again if the block isn't locked. | |
6031 | * we should start walking down the tree again if reference | |
6032 | * count is one. | |
6033 | */ | |
6034 | if (!path->locks[level]) { | |
6035 | BUG_ON(level == 0); | |
6036 | btrfs_tree_lock(eb); | |
6037 | btrfs_set_lock_blocking(eb); | |
6038 | path->locks[level] = 1; | |
6039 | ||
6040 | ret = btrfs_lookup_extent_info(trans, root, | |
6041 | eb->start, eb->len, | |
6042 | &wc->refs[level], | |
6043 | &wc->flags[level]); | |
f82d02d9 | 6044 | BUG_ON(ret); |
2c47e605 YZ |
6045 | BUG_ON(wc->refs[level] == 0); |
6046 | if (wc->refs[level] == 1) { | |
6047 | btrfs_tree_unlock(eb); | |
6048 | path->locks[level] = 0; | |
6049 | return 1; | |
6050 | } | |
f82d02d9 | 6051 | } |
2c47e605 | 6052 | } |
f82d02d9 | 6053 | |
2c47e605 YZ |
6054 | /* wc->stage == DROP_REFERENCE */ |
6055 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 6056 | |
2c47e605 YZ |
6057 | if (wc->refs[level] == 1) { |
6058 | if (level == 0) { | |
6059 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6060 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
6061 | else | |
6062 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
6063 | BUG_ON(ret); | |
6064 | } | |
6065 | /* make block locked assertion in clean_tree_block happy */ | |
6066 | if (!path->locks[level] && | |
6067 | btrfs_header_generation(eb) == trans->transid) { | |
6068 | btrfs_tree_lock(eb); | |
6069 | btrfs_set_lock_blocking(eb); | |
6070 | path->locks[level] = 1; | |
6071 | } | |
6072 | clean_tree_block(trans, root, eb); | |
6073 | } | |
6074 | ||
6075 | if (eb == root->node) { | |
6076 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6077 | parent = eb->start; | |
6078 | else | |
6079 | BUG_ON(root->root_key.objectid != | |
6080 | btrfs_header_owner(eb)); | |
6081 | } else { | |
6082 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6083 | parent = path->nodes[level + 1]->start; | |
6084 | else | |
6085 | BUG_ON(root->root_key.objectid != | |
6086 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 6087 | } |
f82d02d9 | 6088 | |
f0486c68 | 6089 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
6090 | out: |
6091 | wc->refs[level] = 0; | |
6092 | wc->flags[level] = 0; | |
f0486c68 | 6093 | return 0; |
2c47e605 YZ |
6094 | } |
6095 | ||
6096 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
6097 | struct btrfs_root *root, | |
6098 | struct btrfs_path *path, | |
6099 | struct walk_control *wc) | |
6100 | { | |
2c47e605 | 6101 | int level = wc->level; |
94fcca9f | 6102 | int lookup_info = 1; |
2c47e605 YZ |
6103 | int ret; |
6104 | ||
6105 | while (level >= 0) { | |
94fcca9f | 6106 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
6107 | if (ret > 0) |
6108 | break; | |
6109 | ||
6110 | if (level == 0) | |
6111 | break; | |
6112 | ||
7a7965f8 YZ |
6113 | if (path->slots[level] >= |
6114 | btrfs_header_nritems(path->nodes[level])) | |
6115 | break; | |
6116 | ||
94fcca9f | 6117 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
6118 | if (ret > 0) { |
6119 | path->slots[level]++; | |
6120 | continue; | |
90d2c51d MX |
6121 | } else if (ret < 0) |
6122 | return ret; | |
1c4850e2 | 6123 | level = wc->level; |
f82d02d9 | 6124 | } |
f82d02d9 YZ |
6125 | return 0; |
6126 | } | |
6127 | ||
d397712b | 6128 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 6129 | struct btrfs_root *root, |
f82d02d9 | 6130 | struct btrfs_path *path, |
2c47e605 | 6131 | struct walk_control *wc, int max_level) |
20524f02 | 6132 | { |
2c47e605 | 6133 | int level = wc->level; |
20524f02 | 6134 | int ret; |
9f3a7427 | 6135 | |
2c47e605 YZ |
6136 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
6137 | while (level < max_level && path->nodes[level]) { | |
6138 | wc->level = level; | |
6139 | if (path->slots[level] + 1 < | |
6140 | btrfs_header_nritems(path->nodes[level])) { | |
6141 | path->slots[level]++; | |
20524f02 CM |
6142 | return 0; |
6143 | } else { | |
2c47e605 YZ |
6144 | ret = walk_up_proc(trans, root, path, wc); |
6145 | if (ret > 0) | |
6146 | return 0; | |
bd56b302 | 6147 | |
2c47e605 YZ |
6148 | if (path->locks[level]) { |
6149 | btrfs_tree_unlock(path->nodes[level]); | |
6150 | path->locks[level] = 0; | |
f82d02d9 | 6151 | } |
2c47e605 YZ |
6152 | free_extent_buffer(path->nodes[level]); |
6153 | path->nodes[level] = NULL; | |
6154 | level++; | |
20524f02 CM |
6155 | } |
6156 | } | |
6157 | return 1; | |
6158 | } | |
6159 | ||
9aca1d51 | 6160 | /* |
2c47e605 YZ |
6161 | * drop a subvolume tree. |
6162 | * | |
6163 | * this function traverses the tree freeing any blocks that only | |
6164 | * referenced by the tree. | |
6165 | * | |
6166 | * when a shared tree block is found. this function decreases its | |
6167 | * reference count by one. if update_ref is true, this function | |
6168 | * also make sure backrefs for the shared block and all lower level | |
6169 | * blocks are properly updated. | |
9aca1d51 | 6170 | */ |
3fd0a558 YZ |
6171 | int btrfs_drop_snapshot(struct btrfs_root *root, |
6172 | struct btrfs_block_rsv *block_rsv, int update_ref) | |
20524f02 | 6173 | { |
5caf2a00 | 6174 | struct btrfs_path *path; |
2c47e605 YZ |
6175 | struct btrfs_trans_handle *trans; |
6176 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 6177 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
6178 | struct walk_control *wc; |
6179 | struct btrfs_key key; | |
6180 | int err = 0; | |
6181 | int ret; | |
6182 | int level; | |
20524f02 | 6183 | |
5caf2a00 CM |
6184 | path = btrfs_alloc_path(); |
6185 | BUG_ON(!path); | |
20524f02 | 6186 | |
2c47e605 YZ |
6187 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
6188 | BUG_ON(!wc); | |
6189 | ||
a22285a6 | 6190 | trans = btrfs_start_transaction(tree_root, 0); |
3fd0a558 YZ |
6191 | if (block_rsv) |
6192 | trans->block_rsv = block_rsv; | |
2c47e605 | 6193 | |
9f3a7427 | 6194 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 6195 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
6196 | path->nodes[level] = btrfs_lock_root_node(root); |
6197 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 6198 | path->slots[level] = 0; |
5d4f98a2 | 6199 | path->locks[level] = 1; |
2c47e605 YZ |
6200 | memset(&wc->update_progress, 0, |
6201 | sizeof(wc->update_progress)); | |
9f3a7427 | 6202 | } else { |
9f3a7427 | 6203 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
6204 | memcpy(&wc->update_progress, &key, |
6205 | sizeof(wc->update_progress)); | |
6206 | ||
6702ed49 | 6207 | level = root_item->drop_level; |
2c47e605 | 6208 | BUG_ON(level == 0); |
6702ed49 | 6209 | path->lowest_level = level; |
2c47e605 YZ |
6210 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6211 | path->lowest_level = 0; | |
6212 | if (ret < 0) { | |
6213 | err = ret; | |
9f3a7427 CM |
6214 | goto out; |
6215 | } | |
1c4850e2 | 6216 | WARN_ON(ret > 0); |
2c47e605 | 6217 | |
7d9eb12c CM |
6218 | /* |
6219 | * unlock our path, this is safe because only this | |
6220 | * function is allowed to delete this snapshot | |
6221 | */ | |
5d4f98a2 | 6222 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
6223 | |
6224 | level = btrfs_header_level(root->node); | |
6225 | while (1) { | |
6226 | btrfs_tree_lock(path->nodes[level]); | |
6227 | btrfs_set_lock_blocking(path->nodes[level]); | |
6228 | ||
6229 | ret = btrfs_lookup_extent_info(trans, root, | |
6230 | path->nodes[level]->start, | |
6231 | path->nodes[level]->len, | |
6232 | &wc->refs[level], | |
6233 | &wc->flags[level]); | |
6234 | BUG_ON(ret); | |
6235 | BUG_ON(wc->refs[level] == 0); | |
6236 | ||
6237 | if (level == root_item->drop_level) | |
6238 | break; | |
6239 | ||
6240 | btrfs_tree_unlock(path->nodes[level]); | |
6241 | WARN_ON(wc->refs[level] != 1); | |
6242 | level--; | |
6243 | } | |
9f3a7427 | 6244 | } |
2c47e605 YZ |
6245 | |
6246 | wc->level = level; | |
6247 | wc->shared_level = -1; | |
6248 | wc->stage = DROP_REFERENCE; | |
6249 | wc->update_ref = update_ref; | |
6250 | wc->keep_locks = 0; | |
1c4850e2 | 6251 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 6252 | |
d397712b | 6253 | while (1) { |
2c47e605 YZ |
6254 | ret = walk_down_tree(trans, root, path, wc); |
6255 | if (ret < 0) { | |
6256 | err = ret; | |
20524f02 | 6257 | break; |
2c47e605 | 6258 | } |
9aca1d51 | 6259 | |
2c47e605 YZ |
6260 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
6261 | if (ret < 0) { | |
6262 | err = ret; | |
20524f02 | 6263 | break; |
2c47e605 YZ |
6264 | } |
6265 | ||
6266 | if (ret > 0) { | |
6267 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
6268 | break; |
6269 | } | |
2c47e605 YZ |
6270 | |
6271 | if (wc->stage == DROP_REFERENCE) { | |
6272 | level = wc->level; | |
6273 | btrfs_node_key(path->nodes[level], | |
6274 | &root_item->drop_progress, | |
6275 | path->slots[level]); | |
6276 | root_item->drop_level = level; | |
6277 | } | |
6278 | ||
6279 | BUG_ON(wc->level == 0); | |
3fd0a558 | 6280 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
6281 | ret = btrfs_update_root(trans, tree_root, |
6282 | &root->root_key, | |
6283 | root_item); | |
6284 | BUG_ON(ret); | |
6285 | ||
3fd0a558 | 6286 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 6287 | trans = btrfs_start_transaction(tree_root, 0); |
3fd0a558 YZ |
6288 | if (block_rsv) |
6289 | trans->block_rsv = block_rsv; | |
c3e69d58 | 6290 | } |
20524f02 | 6291 | } |
2c47e605 YZ |
6292 | btrfs_release_path(root, path); |
6293 | BUG_ON(err); | |
6294 | ||
6295 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
6296 | BUG_ON(ret); | |
6297 | ||
76dda93c YZ |
6298 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
6299 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
6300 | NULL, NULL); | |
6301 | BUG_ON(ret < 0); | |
6302 | if (ret > 0) { | |
6303 | ret = btrfs_del_orphan_item(trans, tree_root, | |
6304 | root->root_key.objectid); | |
6305 | BUG_ON(ret); | |
6306 | } | |
6307 | } | |
6308 | ||
6309 | if (root->in_radix) { | |
6310 | btrfs_free_fs_root(tree_root->fs_info, root); | |
6311 | } else { | |
6312 | free_extent_buffer(root->node); | |
6313 | free_extent_buffer(root->commit_root); | |
6314 | kfree(root); | |
6315 | } | |
9f3a7427 | 6316 | out: |
3fd0a558 | 6317 | btrfs_end_transaction_throttle(trans, tree_root); |
2c47e605 | 6318 | kfree(wc); |
5caf2a00 | 6319 | btrfs_free_path(path); |
2c47e605 | 6320 | return err; |
20524f02 | 6321 | } |
9078a3e1 | 6322 | |
2c47e605 YZ |
6323 | /* |
6324 | * drop subtree rooted at tree block 'node'. | |
6325 | * | |
6326 | * NOTE: this function will unlock and release tree block 'node' | |
6327 | */ | |
f82d02d9 YZ |
6328 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
6329 | struct btrfs_root *root, | |
6330 | struct extent_buffer *node, | |
6331 | struct extent_buffer *parent) | |
6332 | { | |
6333 | struct btrfs_path *path; | |
2c47e605 | 6334 | struct walk_control *wc; |
f82d02d9 YZ |
6335 | int level; |
6336 | int parent_level; | |
6337 | int ret = 0; | |
6338 | int wret; | |
6339 | ||
2c47e605 YZ |
6340 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
6341 | ||
f82d02d9 YZ |
6342 | path = btrfs_alloc_path(); |
6343 | BUG_ON(!path); | |
6344 | ||
2c47e605 YZ |
6345 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
6346 | BUG_ON(!wc); | |
6347 | ||
b9447ef8 | 6348 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
6349 | parent_level = btrfs_header_level(parent); |
6350 | extent_buffer_get(parent); | |
6351 | path->nodes[parent_level] = parent; | |
6352 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
6353 | ||
b9447ef8 | 6354 | btrfs_assert_tree_locked(node); |
f82d02d9 | 6355 | level = btrfs_header_level(node); |
f82d02d9 YZ |
6356 | path->nodes[level] = node; |
6357 | path->slots[level] = 0; | |
2c47e605 YZ |
6358 | path->locks[level] = 1; |
6359 | ||
6360 | wc->refs[parent_level] = 1; | |
6361 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6362 | wc->level = level; | |
6363 | wc->shared_level = -1; | |
6364 | wc->stage = DROP_REFERENCE; | |
6365 | wc->update_ref = 0; | |
6366 | wc->keep_locks = 1; | |
1c4850e2 | 6367 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
6368 | |
6369 | while (1) { | |
2c47e605 YZ |
6370 | wret = walk_down_tree(trans, root, path, wc); |
6371 | if (wret < 0) { | |
f82d02d9 | 6372 | ret = wret; |
f82d02d9 | 6373 | break; |
2c47e605 | 6374 | } |
f82d02d9 | 6375 | |
2c47e605 | 6376 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
6377 | if (wret < 0) |
6378 | ret = wret; | |
6379 | if (wret != 0) | |
6380 | break; | |
6381 | } | |
6382 | ||
2c47e605 | 6383 | kfree(wc); |
f82d02d9 YZ |
6384 | btrfs_free_path(path); |
6385 | return ret; | |
6386 | } | |
6387 | ||
5d4f98a2 | 6388 | #if 0 |
8e7bf94f CM |
6389 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
6390 | unsigned long nr) | |
6391 | { | |
6392 | return min(last, start + nr - 1); | |
6393 | } | |
6394 | ||
d397712b | 6395 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
98ed5174 | 6396 | u64 len) |
edbd8d4e CM |
6397 | { |
6398 | u64 page_start; | |
6399 | u64 page_end; | |
1a40e23b | 6400 | unsigned long first_index; |
edbd8d4e | 6401 | unsigned long last_index; |
edbd8d4e CM |
6402 | unsigned long i; |
6403 | struct page *page; | |
d1310b2e | 6404 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 6405 | struct file_ra_state *ra; |
3eaa2885 | 6406 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
6407 | unsigned int total_read = 0; |
6408 | unsigned int total_dirty = 0; | |
6409 | int ret = 0; | |
4313b399 CM |
6410 | |
6411 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
6412 | |
6413 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 6414 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
6415 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
6416 | ||
1a40e23b ZY |
6417 | /* make sure the dirty trick played by the caller work */ |
6418 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
6419 | first_index, last_index); | |
6420 | if (ret) | |
6421 | goto out_unlock; | |
8e7bf94f | 6422 | |
4313b399 | 6423 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 6424 | |
1a40e23b ZY |
6425 | for (i = first_index ; i <= last_index; i++) { |
6426 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 6427 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 6428 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
6429 | } |
6430 | total_read++; | |
3eaa2885 CM |
6431 | again: |
6432 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 6433 | BUG_ON(1); |
edbd8d4e | 6434 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 6435 | if (!page) { |
1a40e23b | 6436 | ret = -ENOMEM; |
edbd8d4e | 6437 | goto out_unlock; |
a061fc8d | 6438 | } |
edbd8d4e CM |
6439 | if (!PageUptodate(page)) { |
6440 | btrfs_readpage(NULL, page); | |
6441 | lock_page(page); | |
6442 | if (!PageUptodate(page)) { | |
6443 | unlock_page(page); | |
6444 | page_cache_release(page); | |
1a40e23b | 6445 | ret = -EIO; |
edbd8d4e CM |
6446 | goto out_unlock; |
6447 | } | |
6448 | } | |
ec44a35c | 6449 | wait_on_page_writeback(page); |
3eaa2885 | 6450 | |
edbd8d4e CM |
6451 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
6452 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 6453 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 6454 | |
3eaa2885 CM |
6455 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
6456 | if (ordered) { | |
6457 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
6458 | unlock_page(page); | |
6459 | page_cache_release(page); | |
6460 | btrfs_start_ordered_extent(inode, ordered, 1); | |
6461 | btrfs_put_ordered_extent(ordered); | |
6462 | goto again; | |
6463 | } | |
6464 | set_page_extent_mapped(page); | |
6465 | ||
1a40e23b ZY |
6466 | if (i == first_index) |
6467 | set_extent_bits(io_tree, page_start, page_end, | |
6468 | EXTENT_BOUNDARY, GFP_NOFS); | |
1f80e4db | 6469 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b | 6470 | |
a061fc8d | 6471 | set_page_dirty(page); |
1a40e23b | 6472 | total_dirty++; |
edbd8d4e | 6473 | |
d1310b2e | 6474 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
6475 | unlock_page(page); |
6476 | page_cache_release(page); | |
6477 | } | |
6478 | ||
6479 | out_unlock: | |
ec44a35c | 6480 | kfree(ra); |
edbd8d4e | 6481 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
6482 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
6483 | return ret; | |
edbd8d4e CM |
6484 | } |
6485 | ||
d397712b | 6486 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
1a40e23b ZY |
6487 | struct btrfs_key *extent_key, |
6488 | u64 offset) | |
6489 | { | |
6490 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
6491 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
6492 | struct extent_map *em; | |
6643558d YZ |
6493 | u64 start = extent_key->objectid - offset; |
6494 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 6495 | |
1a40e23b ZY |
6496 | em = alloc_extent_map(GFP_NOFS); |
6497 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 6498 | |
6643558d | 6499 | em->start = start; |
1a40e23b | 6500 | em->len = extent_key->offset; |
c8b97818 | 6501 | em->block_len = extent_key->offset; |
1a40e23b ZY |
6502 | em->block_start = extent_key->objectid; |
6503 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
6504 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
6505 | ||
6506 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 6507 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
6508 | while (1) { |
6509 | int ret; | |
890871be | 6510 | write_lock(&em_tree->lock); |
1a40e23b | 6511 | ret = add_extent_mapping(em_tree, em); |
890871be | 6512 | write_unlock(&em_tree->lock); |
1a40e23b ZY |
6513 | if (ret != -EEXIST) { |
6514 | free_extent_map(em); | |
bf4ef679 CM |
6515 | break; |
6516 | } | |
6643558d | 6517 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 6518 | } |
6643558d | 6519 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 6520 | |
6643558d | 6521 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 6522 | } |
edbd8d4e | 6523 | |
1a40e23b ZY |
6524 | struct btrfs_ref_path { |
6525 | u64 extent_start; | |
6526 | u64 nodes[BTRFS_MAX_LEVEL]; | |
6527 | u64 root_objectid; | |
6528 | u64 root_generation; | |
6529 | u64 owner_objectid; | |
1a40e23b ZY |
6530 | u32 num_refs; |
6531 | int lowest_level; | |
6532 | int current_level; | |
f82d02d9 YZ |
6533 | int shared_level; |
6534 | ||
6535 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
6536 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 6537 | }; |
7d9eb12c | 6538 | |
1a40e23b | 6539 | struct disk_extent { |
c8b97818 | 6540 | u64 ram_bytes; |
1a40e23b ZY |
6541 | u64 disk_bytenr; |
6542 | u64 disk_num_bytes; | |
6543 | u64 offset; | |
6544 | u64 num_bytes; | |
c8b97818 CM |
6545 | u8 compression; |
6546 | u8 encryption; | |
6547 | u16 other_encoding; | |
1a40e23b | 6548 | }; |
4313b399 | 6549 | |
1a40e23b ZY |
6550 | static int is_cowonly_root(u64 root_objectid) |
6551 | { | |
6552 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
6553 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
6554 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
6555 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
0403e47e YZ |
6556 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
6557 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1a40e23b ZY |
6558 | return 1; |
6559 | return 0; | |
6560 | } | |
edbd8d4e | 6561 | |
d397712b | 6562 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6563 | struct btrfs_root *extent_root, |
6564 | struct btrfs_ref_path *ref_path, | |
6565 | int first_time) | |
6566 | { | |
6567 | struct extent_buffer *leaf; | |
6568 | struct btrfs_path *path; | |
6569 | struct btrfs_extent_ref *ref; | |
6570 | struct btrfs_key key; | |
6571 | struct btrfs_key found_key; | |
6572 | u64 bytenr; | |
6573 | u32 nritems; | |
6574 | int level; | |
6575 | int ret = 1; | |
edbd8d4e | 6576 | |
1a40e23b ZY |
6577 | path = btrfs_alloc_path(); |
6578 | if (!path) | |
6579 | return -ENOMEM; | |
bf4ef679 | 6580 | |
1a40e23b ZY |
6581 | if (first_time) { |
6582 | ref_path->lowest_level = -1; | |
6583 | ref_path->current_level = -1; | |
f82d02d9 | 6584 | ref_path->shared_level = -1; |
1a40e23b ZY |
6585 | goto walk_up; |
6586 | } | |
6587 | walk_down: | |
6588 | level = ref_path->current_level - 1; | |
6589 | while (level >= -1) { | |
6590 | u64 parent; | |
6591 | if (level < ref_path->lowest_level) | |
6592 | break; | |
bf4ef679 | 6593 | |
d397712b | 6594 | if (level >= 0) |
1a40e23b | 6595 | bytenr = ref_path->nodes[level]; |
d397712b | 6596 | else |
1a40e23b | 6597 | bytenr = ref_path->extent_start; |
1a40e23b | 6598 | BUG_ON(bytenr == 0); |
bf4ef679 | 6599 | |
1a40e23b ZY |
6600 | parent = ref_path->nodes[level + 1]; |
6601 | ref_path->nodes[level + 1] = 0; | |
6602 | ref_path->current_level = level; | |
6603 | BUG_ON(parent == 0); | |
0ef3e66b | 6604 | |
1a40e23b ZY |
6605 | key.objectid = bytenr; |
6606 | key.offset = parent + 1; | |
6607 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 6608 | |
1a40e23b ZY |
6609 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
6610 | if (ret < 0) | |
edbd8d4e | 6611 | goto out; |
1a40e23b | 6612 | BUG_ON(ret == 0); |
7d9eb12c | 6613 | |
1a40e23b ZY |
6614 | leaf = path->nodes[0]; |
6615 | nritems = btrfs_header_nritems(leaf); | |
6616 | if (path->slots[0] >= nritems) { | |
6617 | ret = btrfs_next_leaf(extent_root, path); | |
6618 | if (ret < 0) | |
6619 | goto out; | |
6620 | if (ret > 0) | |
6621 | goto next; | |
6622 | leaf = path->nodes[0]; | |
6623 | } | |
0ef3e66b | 6624 | |
1a40e23b ZY |
6625 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6626 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
6627 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
6628 | if (level < ref_path->shared_level) | |
6629 | ref_path->shared_level = level; | |
1a40e23b | 6630 | goto found; |
f82d02d9 | 6631 | } |
1a40e23b ZY |
6632 | next: |
6633 | level--; | |
6634 | btrfs_release_path(extent_root, path); | |
d899e052 | 6635 | cond_resched(); |
1a40e23b ZY |
6636 | } |
6637 | /* reached lowest level */ | |
6638 | ret = 1; | |
6639 | goto out; | |
6640 | walk_up: | |
6641 | level = ref_path->current_level; | |
6642 | while (level < BTRFS_MAX_LEVEL - 1) { | |
6643 | u64 ref_objectid; | |
d397712b CM |
6644 | |
6645 | if (level >= 0) | |
1a40e23b | 6646 | bytenr = ref_path->nodes[level]; |
d397712b | 6647 | else |
1a40e23b | 6648 | bytenr = ref_path->extent_start; |
d397712b | 6649 | |
1a40e23b | 6650 | BUG_ON(bytenr == 0); |
edbd8d4e | 6651 | |
1a40e23b ZY |
6652 | key.objectid = bytenr; |
6653 | key.offset = 0; | |
6654 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 6655 | |
1a40e23b ZY |
6656 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
6657 | if (ret < 0) | |
6658 | goto out; | |
edbd8d4e | 6659 | |
1a40e23b ZY |
6660 | leaf = path->nodes[0]; |
6661 | nritems = btrfs_header_nritems(leaf); | |
6662 | if (path->slots[0] >= nritems) { | |
6663 | ret = btrfs_next_leaf(extent_root, path); | |
6664 | if (ret < 0) | |
6665 | goto out; | |
6666 | if (ret > 0) { | |
6667 | /* the extent was freed by someone */ | |
6668 | if (ref_path->lowest_level == level) | |
6669 | goto out; | |
6670 | btrfs_release_path(extent_root, path); | |
6671 | goto walk_down; | |
6672 | } | |
6673 | leaf = path->nodes[0]; | |
6674 | } | |
edbd8d4e | 6675 | |
1a40e23b ZY |
6676 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6677 | if (found_key.objectid != bytenr || | |
6678 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
6679 | /* the extent was freed by someone */ | |
6680 | if (ref_path->lowest_level == level) { | |
6681 | ret = 1; | |
6682 | goto out; | |
6683 | } | |
6684 | btrfs_release_path(extent_root, path); | |
6685 | goto walk_down; | |
6686 | } | |
6687 | found: | |
6688 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
6689 | struct btrfs_extent_ref); | |
6690 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
6691 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
6692 | if (first_time) { | |
6693 | level = (int)ref_objectid; | |
6694 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
6695 | ref_path->lowest_level = level; | |
6696 | ref_path->current_level = level; | |
6697 | ref_path->nodes[level] = bytenr; | |
6698 | } else { | |
6699 | WARN_ON(ref_objectid != level); | |
6700 | } | |
6701 | } else { | |
6702 | WARN_ON(level != -1); | |
6703 | } | |
6704 | first_time = 0; | |
bf4ef679 | 6705 | |
1a40e23b ZY |
6706 | if (ref_path->lowest_level == level) { |
6707 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
6708 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
6709 | } | |
bf4ef679 | 6710 | |
7d9eb12c | 6711 | /* |
1a40e23b ZY |
6712 | * the block is tree root or the block isn't in reference |
6713 | * counted tree. | |
7d9eb12c | 6714 | */ |
1a40e23b ZY |
6715 | if (found_key.objectid == found_key.offset || |
6716 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
6717 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
6718 | ref_path->root_generation = | |
6719 | btrfs_ref_generation(leaf, ref); | |
6720 | if (level < 0) { | |
6721 | /* special reference from the tree log */ | |
6722 | ref_path->nodes[0] = found_key.offset; | |
6723 | ref_path->current_level = 0; | |
6724 | } | |
6725 | ret = 0; | |
6726 | goto out; | |
6727 | } | |
7d9eb12c | 6728 | |
1a40e23b ZY |
6729 | level++; |
6730 | BUG_ON(ref_path->nodes[level] != 0); | |
6731 | ref_path->nodes[level] = found_key.offset; | |
6732 | ref_path->current_level = level; | |
bf4ef679 | 6733 | |
1a40e23b ZY |
6734 | /* |
6735 | * the reference was created in the running transaction, | |
6736 | * no need to continue walking up. | |
6737 | */ | |
6738 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
6739 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
6740 | ref_path->root_generation = | |
6741 | btrfs_ref_generation(leaf, ref); | |
6742 | ret = 0; | |
6743 | goto out; | |
7d9eb12c CM |
6744 | } |
6745 | ||
1a40e23b | 6746 | btrfs_release_path(extent_root, path); |
d899e052 | 6747 | cond_resched(); |
7d9eb12c | 6748 | } |
1a40e23b ZY |
6749 | /* reached max tree level, but no tree root found. */ |
6750 | BUG(); | |
edbd8d4e | 6751 | out: |
1a40e23b ZY |
6752 | btrfs_free_path(path); |
6753 | return ret; | |
edbd8d4e CM |
6754 | } |
6755 | ||
1a40e23b ZY |
6756 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
6757 | struct btrfs_root *extent_root, | |
6758 | struct btrfs_ref_path *ref_path, | |
6759 | u64 extent_start) | |
a061fc8d | 6760 | { |
1a40e23b ZY |
6761 | memset(ref_path, 0, sizeof(*ref_path)); |
6762 | ref_path->extent_start = extent_start; | |
a061fc8d | 6763 | |
1a40e23b | 6764 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
6765 | } |
6766 | ||
1a40e23b ZY |
6767 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
6768 | struct btrfs_root *extent_root, | |
6769 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 6770 | { |
1a40e23b ZY |
6771 | return __next_ref_path(trans, extent_root, ref_path, 0); |
6772 | } | |
6773 | ||
d397712b | 6774 | static noinline int get_new_locations(struct inode *reloc_inode, |
1a40e23b ZY |
6775 | struct btrfs_key *extent_key, |
6776 | u64 offset, int no_fragment, | |
6777 | struct disk_extent **extents, | |
6778 | int *nr_extents) | |
6779 | { | |
6780 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
6781 | struct btrfs_path *path; | |
6782 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 6783 | struct extent_buffer *leaf; |
1a40e23b ZY |
6784 | struct disk_extent *exts = *extents; |
6785 | struct btrfs_key found_key; | |
6786 | u64 cur_pos; | |
6787 | u64 last_byte; | |
edbd8d4e | 6788 | u32 nritems; |
1a40e23b ZY |
6789 | int nr = 0; |
6790 | int max = *nr_extents; | |
6791 | int ret; | |
edbd8d4e | 6792 | |
1a40e23b ZY |
6793 | WARN_ON(!no_fragment && *extents); |
6794 | if (!exts) { | |
6795 | max = 1; | |
6796 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
6797 | if (!exts) | |
6798 | return -ENOMEM; | |
a061fc8d | 6799 | } |
edbd8d4e | 6800 | |
1a40e23b ZY |
6801 | path = btrfs_alloc_path(); |
6802 | BUG_ON(!path); | |
edbd8d4e | 6803 | |
1a40e23b ZY |
6804 | cur_pos = extent_key->objectid - offset; |
6805 | last_byte = extent_key->objectid + extent_key->offset; | |
6806 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
6807 | cur_pos, 0); | |
6808 | if (ret < 0) | |
6809 | goto out; | |
6810 | if (ret > 0) { | |
6811 | ret = -ENOENT; | |
6812 | goto out; | |
6813 | } | |
edbd8d4e | 6814 | |
1a40e23b | 6815 | while (1) { |
edbd8d4e CM |
6816 | leaf = path->nodes[0]; |
6817 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
6818 | if (path->slots[0] >= nritems) { |
6819 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
6820 | if (ret < 0) |
6821 | goto out; | |
1a40e23b ZY |
6822 | if (ret > 0) |
6823 | break; | |
bf4ef679 | 6824 | leaf = path->nodes[0]; |
a061fc8d | 6825 | } |
edbd8d4e CM |
6826 | |
6827 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
6828 | if (found_key.offset != cur_pos || |
6829 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
6830 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
6831 | break; |
6832 | ||
1a40e23b ZY |
6833 | fi = btrfs_item_ptr(leaf, path->slots[0], |
6834 | struct btrfs_file_extent_item); | |
6835 | if (btrfs_file_extent_type(leaf, fi) != | |
6836 | BTRFS_FILE_EXTENT_REG || | |
6837 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 6838 | break; |
1a40e23b ZY |
6839 | |
6840 | if (nr == max) { | |
6841 | struct disk_extent *old = exts; | |
6842 | max *= 2; | |
6843 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
6844 | memcpy(exts, old, sizeof(*exts) * nr); | |
6845 | if (old != *extents) | |
6846 | kfree(old); | |
a061fc8d | 6847 | } |
edbd8d4e | 6848 | |
1a40e23b ZY |
6849 | exts[nr].disk_bytenr = |
6850 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
6851 | exts[nr].disk_num_bytes = | |
6852 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
6853 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
6854 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
6855 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
6856 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
6857 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
6858 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
6859 | fi); | |
d899e052 YZ |
6860 | BUG_ON(exts[nr].offset > 0); |
6861 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
6862 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 6863 | |
1a40e23b ZY |
6864 | cur_pos += exts[nr].num_bytes; |
6865 | nr++; | |
6866 | ||
6867 | if (cur_pos + offset >= last_byte) | |
6868 | break; | |
6869 | ||
6870 | if (no_fragment) { | |
6871 | ret = 1; | |
edbd8d4e | 6872 | goto out; |
1a40e23b ZY |
6873 | } |
6874 | path->slots[0]++; | |
6875 | } | |
6876 | ||
1f80e4db | 6877 | BUG_ON(cur_pos + offset > last_byte); |
1a40e23b ZY |
6878 | if (cur_pos + offset < last_byte) { |
6879 | ret = -ENOENT; | |
6880 | goto out; | |
edbd8d4e CM |
6881 | } |
6882 | ret = 0; | |
6883 | out: | |
1a40e23b ZY |
6884 | btrfs_free_path(path); |
6885 | if (ret) { | |
6886 | if (exts != *extents) | |
6887 | kfree(exts); | |
6888 | } else { | |
6889 | *extents = exts; | |
6890 | *nr_extents = nr; | |
6891 | } | |
6892 | return ret; | |
6893 | } | |
6894 | ||
d397712b | 6895 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6896 | struct btrfs_root *root, |
6897 | struct btrfs_path *path, | |
6898 | struct btrfs_key *extent_key, | |
6899 | struct btrfs_key *leaf_key, | |
6900 | struct btrfs_ref_path *ref_path, | |
6901 | struct disk_extent *new_extents, | |
6902 | int nr_extents) | |
6903 | { | |
6904 | struct extent_buffer *leaf; | |
6905 | struct btrfs_file_extent_item *fi; | |
6906 | struct inode *inode = NULL; | |
6907 | struct btrfs_key key; | |
6908 | u64 lock_start = 0; | |
6909 | u64 lock_end = 0; | |
6910 | u64 num_bytes; | |
6911 | u64 ext_offset; | |
86288a19 | 6912 | u64 search_end = (u64)-1; |
1a40e23b | 6913 | u32 nritems; |
3bb1a1bc | 6914 | int nr_scaned = 0; |
1a40e23b | 6915 | int extent_locked = 0; |
d899e052 | 6916 | int extent_type; |
1a40e23b ZY |
6917 | int ret; |
6918 | ||
3bb1a1bc | 6919 | memcpy(&key, leaf_key, sizeof(key)); |
1a40e23b | 6920 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
6921 | if (key.objectid < ref_path->owner_objectid || |
6922 | (key.objectid == ref_path->owner_objectid && | |
6923 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
6924 | key.objectid = ref_path->owner_objectid; | |
6925 | key.type = BTRFS_EXTENT_DATA_KEY; | |
6926 | key.offset = 0; | |
6927 | } | |
1a40e23b ZY |
6928 | } |
6929 | ||
6930 | while (1) { | |
6931 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
6932 | if (ret < 0) | |
6933 | goto out; | |
6934 | ||
6935 | leaf = path->nodes[0]; | |
6936 | nritems = btrfs_header_nritems(leaf); | |
6937 | next: | |
6938 | if (extent_locked && ret > 0) { | |
6939 | /* | |
6940 | * the file extent item was modified by someone | |
6941 | * before the extent got locked. | |
6942 | */ | |
1a40e23b ZY |
6943 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6944 | lock_end, GFP_NOFS); | |
6945 | extent_locked = 0; | |
6946 | } | |
6947 | ||
6948 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 6949 | if (++nr_scaned > 2) |
1a40e23b ZY |
6950 | break; |
6951 | ||
6952 | BUG_ON(extent_locked); | |
6953 | ret = btrfs_next_leaf(root, path); | |
6954 | if (ret < 0) | |
6955 | goto out; | |
6956 | if (ret > 0) | |
6957 | break; | |
6958 | leaf = path->nodes[0]; | |
6959 | nritems = btrfs_header_nritems(leaf); | |
6960 | } | |
6961 | ||
6962 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
6963 | ||
6964 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
6965 | if ((key.objectid > ref_path->owner_objectid) || | |
6966 | (key.objectid == ref_path->owner_objectid && | |
6967 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
86288a19 | 6968 | key.offset >= search_end) |
1a40e23b ZY |
6969 | break; |
6970 | } | |
6971 | ||
6972 | if (inode && key.objectid != inode->i_ino) { | |
6973 | BUG_ON(extent_locked); | |
6974 | btrfs_release_path(root, path); | |
6975 | mutex_unlock(&inode->i_mutex); | |
6976 | iput(inode); | |
6977 | inode = NULL; | |
6978 | continue; | |
6979 | } | |
6980 | ||
6981 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
6982 | path->slots[0]++; | |
6983 | ret = 1; | |
6984 | goto next; | |
6985 | } | |
6986 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
6987 | struct btrfs_file_extent_item); | |
d899e052 YZ |
6988 | extent_type = btrfs_file_extent_type(leaf, fi); |
6989 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
6990 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
6991 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
6992 | extent_key->objectid)) { | |
6993 | path->slots[0]++; | |
6994 | ret = 1; | |
6995 | goto next; | |
6996 | } | |
6997 | ||
6998 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
6999 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
7000 | ||
86288a19 YZ |
7001 | if (search_end == (u64)-1) { |
7002 | search_end = key.offset - ext_offset + | |
7003 | btrfs_file_extent_ram_bytes(leaf, fi); | |
7004 | } | |
1a40e23b ZY |
7005 | |
7006 | if (!extent_locked) { | |
7007 | lock_start = key.offset; | |
7008 | lock_end = lock_start + num_bytes - 1; | |
7009 | } else { | |
6643558d YZ |
7010 | if (lock_start > key.offset || |
7011 | lock_end + 1 < key.offset + num_bytes) { | |
7012 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
7013 | lock_start, lock_end, GFP_NOFS); | |
7014 | extent_locked = 0; | |
7015 | } | |
1a40e23b ZY |
7016 | } |
7017 | ||
7018 | if (!inode) { | |
7019 | btrfs_release_path(root, path); | |
7020 | ||
7021 | inode = btrfs_iget_locked(root->fs_info->sb, | |
7022 | key.objectid, root); | |
7023 | if (inode->i_state & I_NEW) { | |
7024 | BTRFS_I(inode)->root = root; | |
7025 | BTRFS_I(inode)->location.objectid = | |
7026 | key.objectid; | |
7027 | BTRFS_I(inode)->location.type = | |
7028 | BTRFS_INODE_ITEM_KEY; | |
7029 | BTRFS_I(inode)->location.offset = 0; | |
7030 | btrfs_read_locked_inode(inode); | |
7031 | unlock_new_inode(inode); | |
7032 | } | |
7033 | /* | |
7034 | * some code call btrfs_commit_transaction while | |
7035 | * holding the i_mutex, so we can't use mutex_lock | |
7036 | * here. | |
7037 | */ | |
7038 | if (is_bad_inode(inode) || | |
7039 | !mutex_trylock(&inode->i_mutex)) { | |
7040 | iput(inode); | |
7041 | inode = NULL; | |
7042 | key.offset = (u64)-1; | |
7043 | goto skip; | |
7044 | } | |
7045 | } | |
7046 | ||
7047 | if (!extent_locked) { | |
7048 | struct btrfs_ordered_extent *ordered; | |
7049 | ||
7050 | btrfs_release_path(root, path); | |
7051 | ||
7052 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
7053 | lock_end, GFP_NOFS); | |
7054 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
7055 | lock_end); | |
7056 | if (ordered && | |
7057 | ordered->file_offset <= lock_end && | |
7058 | ordered->file_offset + ordered->len > lock_start) { | |
7059 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
7060 | lock_start, lock_end, GFP_NOFS); | |
7061 | btrfs_start_ordered_extent(inode, ordered, 1); | |
7062 | btrfs_put_ordered_extent(ordered); | |
7063 | key.offset += num_bytes; | |
7064 | goto skip; | |
7065 | } | |
7066 | if (ordered) | |
7067 | btrfs_put_ordered_extent(ordered); | |
7068 | ||
1a40e23b ZY |
7069 | extent_locked = 1; |
7070 | continue; | |
7071 | } | |
7072 | ||
7073 | if (nr_extents == 1) { | |
7074 | /* update extent pointer in place */ | |
1a40e23b ZY |
7075 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
7076 | new_extents[0].disk_bytenr); | |
7077 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
7078 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
7079 | btrfs_mark_buffer_dirty(leaf); |
7080 | ||
7081 | btrfs_drop_extent_cache(inode, key.offset, | |
7082 | key.offset + num_bytes - 1, 0); | |
7083 | ||
7084 | ret = btrfs_inc_extent_ref(trans, root, | |
7085 | new_extents[0].disk_bytenr, | |
7086 | new_extents[0].disk_num_bytes, | |
7087 | leaf->start, | |
7088 | root->root_key.objectid, | |
7089 | trans->transid, | |
3bb1a1bc | 7090 | key.objectid); |
1a40e23b ZY |
7091 | BUG_ON(ret); |
7092 | ||
7093 | ret = btrfs_free_extent(trans, root, | |
7094 | extent_key->objectid, | |
7095 | extent_key->offset, | |
7096 | leaf->start, | |
7097 | btrfs_header_owner(leaf), | |
7098 | btrfs_header_generation(leaf), | |
3bb1a1bc | 7099 | key.objectid, 0); |
1a40e23b ZY |
7100 | BUG_ON(ret); |
7101 | ||
7102 | btrfs_release_path(root, path); | |
7103 | key.offset += num_bytes; | |
7104 | } else { | |
d899e052 YZ |
7105 | BUG_ON(1); |
7106 | #if 0 | |
1a40e23b ZY |
7107 | u64 alloc_hint; |
7108 | u64 extent_len; | |
7109 | int i; | |
7110 | /* | |
7111 | * drop old extent pointer at first, then insert the | |
7112 | * new pointers one bye one | |
7113 | */ | |
7114 | btrfs_release_path(root, path); | |
7115 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
7116 | key.offset + num_bytes, | |
7117 | key.offset, &alloc_hint); | |
7118 | BUG_ON(ret); | |
7119 | ||
7120 | for (i = 0; i < nr_extents; i++) { | |
7121 | if (ext_offset >= new_extents[i].num_bytes) { | |
7122 | ext_offset -= new_extents[i].num_bytes; | |
7123 | continue; | |
7124 | } | |
7125 | extent_len = min(new_extents[i].num_bytes - | |
7126 | ext_offset, num_bytes); | |
7127 | ||
7128 | ret = btrfs_insert_empty_item(trans, root, | |
7129 | path, &key, | |
7130 | sizeof(*fi)); | |
7131 | BUG_ON(ret); | |
7132 | ||
7133 | leaf = path->nodes[0]; | |
7134 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
7135 | struct btrfs_file_extent_item); | |
7136 | btrfs_set_file_extent_generation(leaf, fi, | |
7137 | trans->transid); | |
7138 | btrfs_set_file_extent_type(leaf, fi, | |
7139 | BTRFS_FILE_EXTENT_REG); | |
7140 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
7141 | new_extents[i].disk_bytenr); | |
7142 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
7143 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
7144 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
7145 | new_extents[i].ram_bytes); | |
7146 | ||
7147 | btrfs_set_file_extent_compression(leaf, fi, | |
7148 | new_extents[i].compression); | |
7149 | btrfs_set_file_extent_encryption(leaf, fi, | |
7150 | new_extents[i].encryption); | |
7151 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
7152 | new_extents[i].other_encoding); | |
7153 | ||
1a40e23b ZY |
7154 | btrfs_set_file_extent_num_bytes(leaf, fi, |
7155 | extent_len); | |
7156 | ext_offset += new_extents[i].offset; | |
7157 | btrfs_set_file_extent_offset(leaf, fi, | |
7158 | ext_offset); | |
7159 | btrfs_mark_buffer_dirty(leaf); | |
7160 | ||
7161 | btrfs_drop_extent_cache(inode, key.offset, | |
7162 | key.offset + extent_len - 1, 0); | |
7163 | ||
7164 | ret = btrfs_inc_extent_ref(trans, root, | |
7165 | new_extents[i].disk_bytenr, | |
7166 | new_extents[i].disk_num_bytes, | |
7167 | leaf->start, | |
7168 | root->root_key.objectid, | |
3bb1a1bc | 7169 | trans->transid, key.objectid); |
1a40e23b ZY |
7170 | BUG_ON(ret); |
7171 | btrfs_release_path(root, path); | |
7172 | ||
a76a3cd4 | 7173 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
7174 | |
7175 | ext_offset = 0; | |
7176 | num_bytes -= extent_len; | |
7177 | key.offset += extent_len; | |
7178 | ||
7179 | if (num_bytes == 0) | |
7180 | break; | |
7181 | } | |
7182 | BUG_ON(i >= nr_extents); | |
d899e052 | 7183 | #endif |
1a40e23b ZY |
7184 | } |
7185 | ||
7186 | if (extent_locked) { | |
1a40e23b ZY |
7187 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
7188 | lock_end, GFP_NOFS); | |
7189 | extent_locked = 0; | |
7190 | } | |
7191 | skip: | |
7192 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
86288a19 | 7193 | key.offset >= search_end) |
1a40e23b ZY |
7194 | break; |
7195 | ||
7196 | cond_resched(); | |
7197 | } | |
7198 | ret = 0; | |
7199 | out: | |
7200 | btrfs_release_path(root, path); | |
7201 | if (inode) { | |
7202 | mutex_unlock(&inode->i_mutex); | |
7203 | if (extent_locked) { | |
1a40e23b ZY |
7204 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
7205 | lock_end, GFP_NOFS); | |
7206 | } | |
7207 | iput(inode); | |
7208 | } | |
7209 | return ret; | |
7210 | } | |
7211 | ||
1a40e23b ZY |
7212 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
7213 | struct btrfs_root *root, | |
7214 | struct extent_buffer *buf, u64 orig_start) | |
7215 | { | |
7216 | int level; | |
7217 | int ret; | |
7218 | ||
7219 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
7220 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
7221 | ||
7222 | level = btrfs_header_level(buf); | |
7223 | if (level == 0) { | |
7224 | struct btrfs_leaf_ref *ref; | |
7225 | struct btrfs_leaf_ref *orig_ref; | |
7226 | ||
7227 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
7228 | if (!orig_ref) | |
7229 | return -ENOENT; | |
7230 | ||
7231 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
7232 | if (!ref) { | |
7233 | btrfs_free_leaf_ref(root, orig_ref); | |
7234 | return -ENOMEM; | |
7235 | } | |
7236 | ||
7237 | ref->nritems = orig_ref->nritems; | |
7238 | memcpy(ref->extents, orig_ref->extents, | |
7239 | sizeof(ref->extents[0]) * ref->nritems); | |
7240 | ||
7241 | btrfs_free_leaf_ref(root, orig_ref); | |
7242 | ||
7243 | ref->root_gen = trans->transid; | |
7244 | ref->bytenr = buf->start; | |
7245 | ref->owner = btrfs_header_owner(buf); | |
7246 | ref->generation = btrfs_header_generation(buf); | |
bd56b302 | 7247 | |
1a40e23b ZY |
7248 | ret = btrfs_add_leaf_ref(root, ref, 0); |
7249 | WARN_ON(ret); | |
7250 | btrfs_free_leaf_ref(root, ref); | |
7251 | } | |
7252 | return 0; | |
7253 | } | |
7254 | ||
d397712b | 7255 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
1a40e23b ZY |
7256 | struct extent_buffer *leaf, |
7257 | struct btrfs_block_group_cache *group, | |
7258 | struct btrfs_root *target_root) | |
7259 | { | |
7260 | struct btrfs_key key; | |
7261 | struct inode *inode = NULL; | |
7262 | struct btrfs_file_extent_item *fi; | |
2ac55d41 | 7263 | struct extent_state *cached_state = NULL; |
1a40e23b ZY |
7264 | u64 num_bytes; |
7265 | u64 skip_objectid = 0; | |
7266 | u32 nritems; | |
7267 | u32 i; | |
7268 | ||
7269 | nritems = btrfs_header_nritems(leaf); | |
7270 | for (i = 0; i < nritems; i++) { | |
7271 | btrfs_item_key_to_cpu(leaf, &key, i); | |
7272 | if (key.objectid == skip_objectid || | |
7273 | key.type != BTRFS_EXTENT_DATA_KEY) | |
7274 | continue; | |
7275 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
7276 | if (btrfs_file_extent_type(leaf, fi) == | |
7277 | BTRFS_FILE_EXTENT_INLINE) | |
7278 | continue; | |
7279 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
7280 | continue; | |
7281 | if (!inode || inode->i_ino != key.objectid) { | |
7282 | iput(inode); | |
7283 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
7284 | key.objectid, target_root, 1); | |
7285 | } | |
7286 | if (!inode) { | |
7287 | skip_objectid = key.objectid; | |
7288 | continue; | |
7289 | } | |
7290 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
7291 | ||
2ac55d41 JB |
7292 | lock_extent_bits(&BTRFS_I(inode)->io_tree, key.offset, |
7293 | key.offset + num_bytes - 1, 0, &cached_state, | |
7294 | GFP_NOFS); | |
1a40e23b ZY |
7295 | btrfs_drop_extent_cache(inode, key.offset, |
7296 | key.offset + num_bytes - 1, 1); | |
2ac55d41 JB |
7297 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, key.offset, |
7298 | key.offset + num_bytes - 1, &cached_state, | |
7299 | GFP_NOFS); | |
1a40e23b ZY |
7300 | cond_resched(); |
7301 | } | |
7302 | iput(inode); | |
7303 | return 0; | |
7304 | } | |
7305 | ||
d397712b | 7306 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7307 | struct btrfs_root *root, |
7308 | struct extent_buffer *leaf, | |
7309 | struct btrfs_block_group_cache *group, | |
7310 | struct inode *reloc_inode) | |
7311 | { | |
7312 | struct btrfs_key key; | |
7313 | struct btrfs_key extent_key; | |
7314 | struct btrfs_file_extent_item *fi; | |
7315 | struct btrfs_leaf_ref *ref; | |
7316 | struct disk_extent *new_extent; | |
7317 | u64 bytenr; | |
7318 | u64 num_bytes; | |
7319 | u32 nritems; | |
7320 | u32 i; | |
7321 | int ext_index; | |
7322 | int nr_extent; | |
7323 | int ret; | |
7324 | ||
7325 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
7326 | BUG_ON(!new_extent); | |
7327 | ||
7328 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
7329 | BUG_ON(!ref); | |
7330 | ||
7331 | ext_index = -1; | |
7332 | nritems = btrfs_header_nritems(leaf); | |
7333 | for (i = 0; i < nritems; i++) { | |
7334 | btrfs_item_key_to_cpu(leaf, &key, i); | |
7335 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
7336 | continue; | |
7337 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
7338 | if (btrfs_file_extent_type(leaf, fi) == | |
7339 | BTRFS_FILE_EXTENT_INLINE) | |
7340 | continue; | |
7341 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
7342 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
7343 | if (bytenr == 0) | |
7344 | continue; | |
7345 | ||
7346 | ext_index++; | |
7347 | if (bytenr >= group->key.objectid + group->key.offset || | |
7348 | bytenr + num_bytes <= group->key.objectid) | |
7349 | continue; | |
7350 | ||
7351 | extent_key.objectid = bytenr; | |
7352 | extent_key.offset = num_bytes; | |
7353 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
7354 | nr_extent = 1; | |
7355 | ret = get_new_locations(reloc_inode, &extent_key, | |
7356 | group->key.objectid, 1, | |
7357 | &new_extent, &nr_extent); | |
7358 | if (ret > 0) | |
7359 | continue; | |
7360 | BUG_ON(ret < 0); | |
7361 | ||
7362 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
7363 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
7364 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
7365 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
7366 | ||
1a40e23b ZY |
7367 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
7368 | new_extent->disk_bytenr); | |
7369 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
7370 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
7371 | btrfs_mark_buffer_dirty(leaf); |
7372 | ||
7373 | ret = btrfs_inc_extent_ref(trans, root, | |
7374 | new_extent->disk_bytenr, | |
7375 | new_extent->disk_num_bytes, | |
7376 | leaf->start, | |
7377 | root->root_key.objectid, | |
3bb1a1bc | 7378 | trans->transid, key.objectid); |
1a40e23b | 7379 | BUG_ON(ret); |
56bec294 | 7380 | |
1a40e23b ZY |
7381 | ret = btrfs_free_extent(trans, root, |
7382 | bytenr, num_bytes, leaf->start, | |
7383 | btrfs_header_owner(leaf), | |
7384 | btrfs_header_generation(leaf), | |
3bb1a1bc | 7385 | key.objectid, 0); |
1a40e23b ZY |
7386 | BUG_ON(ret); |
7387 | cond_resched(); | |
7388 | } | |
7389 | kfree(new_extent); | |
7390 | BUG_ON(ext_index + 1 != ref->nritems); | |
7391 | btrfs_free_leaf_ref(root, ref); | |
7392 | return 0; | |
7393 | } | |
7394 | ||
f82d02d9 YZ |
7395 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
7396 | struct btrfs_root *root) | |
1a40e23b ZY |
7397 | { |
7398 | struct btrfs_root *reloc_root; | |
f82d02d9 | 7399 | int ret; |
1a40e23b ZY |
7400 | |
7401 | if (root->reloc_root) { | |
7402 | reloc_root = root->reloc_root; | |
7403 | root->reloc_root = NULL; | |
7404 | list_add(&reloc_root->dead_list, | |
7405 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
7406 | |
7407 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
7408 | reloc_root->node->start); | |
7409 | btrfs_set_root_level(&root->root_item, | |
7410 | btrfs_header_level(reloc_root->node)); | |
7411 | memset(&reloc_root->root_item.drop_progress, 0, | |
7412 | sizeof(struct btrfs_disk_key)); | |
7413 | reloc_root->root_item.drop_level = 0; | |
7414 | ||
7415 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
7416 | &reloc_root->root_key, | |
7417 | &reloc_root->root_item); | |
7418 | BUG_ON(ret); | |
1a40e23b ZY |
7419 | } |
7420 | return 0; | |
7421 | } | |
7422 | ||
7423 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
7424 | { | |
7425 | struct btrfs_trans_handle *trans; | |
7426 | struct btrfs_root *reloc_root; | |
7427 | struct btrfs_root *prev_root = NULL; | |
7428 | struct list_head dead_roots; | |
7429 | int ret; | |
7430 | unsigned long nr; | |
7431 | ||
7432 | INIT_LIST_HEAD(&dead_roots); | |
7433 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
7434 | ||
7435 | while (!list_empty(&dead_roots)) { | |
7436 | reloc_root = list_entry(dead_roots.prev, | |
7437 | struct btrfs_root, dead_list); | |
7438 | list_del_init(&reloc_root->dead_list); | |
7439 | ||
7440 | BUG_ON(reloc_root->commit_root != NULL); | |
7441 | while (1) { | |
7442 | trans = btrfs_join_transaction(root, 1); | |
7443 | BUG_ON(!trans); | |
7444 | ||
7445 | mutex_lock(&root->fs_info->drop_mutex); | |
7446 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
7447 | if (ret != -EAGAIN) | |
7448 | break; | |
7449 | mutex_unlock(&root->fs_info->drop_mutex); | |
7450 | ||
7451 | nr = trans->blocks_used; | |
7452 | ret = btrfs_end_transaction(trans, root); | |
7453 | BUG_ON(ret); | |
7454 | btrfs_btree_balance_dirty(root, nr); | |
7455 | } | |
7456 | ||
7457 | free_extent_buffer(reloc_root->node); | |
7458 | ||
7459 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
7460 | &reloc_root->root_key); | |
7461 | BUG_ON(ret); | |
7462 | mutex_unlock(&root->fs_info->drop_mutex); | |
7463 | ||
7464 | nr = trans->blocks_used; | |
7465 | ret = btrfs_end_transaction(trans, root); | |
7466 | BUG_ON(ret); | |
7467 | btrfs_btree_balance_dirty(root, nr); | |
7468 | ||
7469 | kfree(prev_root); | |
7470 | prev_root = reloc_root; | |
7471 | } | |
7472 | if (prev_root) { | |
7473 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
7474 | kfree(prev_root); | |
7475 | } | |
7476 | return 0; | |
7477 | } | |
7478 | ||
7479 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
7480 | { | |
7481 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
7482 | return 0; | |
7483 | } | |
7484 | ||
7485 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
7486 | { | |
7487 | struct btrfs_root *reloc_root; | |
7488 | struct btrfs_trans_handle *trans; | |
7489 | struct btrfs_key location; | |
7490 | int found; | |
7491 | int ret; | |
7492 | ||
7493 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
7494 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
7495 | BUG_ON(ret); | |
7496 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
7497 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
7498 | ||
7499 | if (found) { | |
7500 | trans = btrfs_start_transaction(root, 1); | |
7501 | BUG_ON(!trans); | |
7502 | ret = btrfs_commit_transaction(trans, root); | |
7503 | BUG_ON(ret); | |
7504 | } | |
7505 | ||
7506 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
7507 | location.offset = (u64)-1; | |
7508 | location.type = BTRFS_ROOT_ITEM_KEY; | |
7509 | ||
7510 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
7511 | BUG_ON(!reloc_root); | |
7512 | btrfs_orphan_cleanup(reloc_root); | |
7513 | return 0; | |
7514 | } | |
7515 | ||
d397712b | 7516 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7517 | struct btrfs_root *root) |
7518 | { | |
7519 | struct btrfs_root *reloc_root; | |
7520 | struct extent_buffer *eb; | |
7521 | struct btrfs_root_item *root_item; | |
7522 | struct btrfs_key root_key; | |
7523 | int ret; | |
7524 | ||
7525 | BUG_ON(!root->ref_cows); | |
7526 | if (root->reloc_root) | |
7527 | return 0; | |
7528 | ||
7529 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
7530 | BUG_ON(!root_item); | |
7531 | ||
7532 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
7533 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
7534 | BUG_ON(ret); | |
7535 | ||
7536 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
7537 | root_key.offset = root->root_key.objectid; | |
7538 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
7539 | ||
7540 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
7541 | btrfs_set_root_refs(root_item, 0); | |
7542 | btrfs_set_root_bytenr(root_item, eb->start); | |
7543 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 7544 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
7545 | |
7546 | btrfs_tree_unlock(eb); | |
7547 | free_extent_buffer(eb); | |
7548 | ||
7549 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
7550 | &root_key, root_item); | |
7551 | BUG_ON(ret); | |
7552 | kfree(root_item); | |
7553 | ||
7554 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
7555 | &root_key); | |
7556 | BUG_ON(!reloc_root); | |
7557 | reloc_root->last_trans = trans->transid; | |
7558 | reloc_root->commit_root = NULL; | |
7559 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
7560 | ||
7561 | root->reloc_root = reloc_root; | |
7562 | return 0; | |
7563 | } | |
7564 | ||
7565 | /* | |
7566 | * Core function of space balance. | |
7567 | * | |
7568 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
7569 | * counted roots. There is one reloc tree for each subvol, and all |
7570 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
7571 | * of the latest committed roots of subvols (root->commit_root). | |
7572 | * | |
7573 | * To relocate a tree block referenced by a subvol, there are two steps. | |
7574 | * COW the block through subvol's reloc tree, then update block pointer | |
7575 | * in the subvol to point to the new block. Since all reloc trees share | |
7576 | * same root key objectid, doing special handing for tree blocks owned | |
7577 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
7578 | * we can use the resulting new block directly when the same block is | |
7579 | * required to COW again through other reloc trees. By this way, relocated | |
7580 | * tree blocks are shared between reloc trees, so they are also shared | |
7581 | * between subvols. | |
1a40e23b | 7582 | */ |
d397712b | 7583 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7584 | struct btrfs_root *root, |
7585 | struct btrfs_path *path, | |
7586 | struct btrfs_key *first_key, | |
7587 | struct btrfs_ref_path *ref_path, | |
7588 | struct btrfs_block_group_cache *group, | |
7589 | struct inode *reloc_inode) | |
7590 | { | |
7591 | struct btrfs_root *reloc_root; | |
7592 | struct extent_buffer *eb = NULL; | |
7593 | struct btrfs_key *keys; | |
7594 | u64 *nodes; | |
7595 | int level; | |
f82d02d9 | 7596 | int shared_level; |
1a40e23b | 7597 | int lowest_level = 0; |
1a40e23b ZY |
7598 | int ret; |
7599 | ||
7600 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
7601 | lowest_level = ref_path->owner_objectid; | |
7602 | ||
f82d02d9 | 7603 | if (!root->ref_cows) { |
1a40e23b ZY |
7604 | path->lowest_level = lowest_level; |
7605 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
7606 | BUG_ON(ret < 0); | |
7607 | path->lowest_level = 0; | |
7608 | btrfs_release_path(root, path); | |
7609 | return 0; | |
7610 | } | |
7611 | ||
1a40e23b ZY |
7612 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
7613 | ret = init_reloc_tree(trans, root); | |
7614 | BUG_ON(ret); | |
7615 | reloc_root = root->reloc_root; | |
7616 | ||
f82d02d9 YZ |
7617 | shared_level = ref_path->shared_level; |
7618 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 7619 | |
f82d02d9 YZ |
7620 | keys = ref_path->node_keys; |
7621 | nodes = ref_path->new_nodes; | |
7622 | memset(&keys[shared_level + 1], 0, | |
7623 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
7624 | memset(&nodes[shared_level + 1], 0, | |
7625 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 7626 | |
f82d02d9 YZ |
7627 | if (nodes[lowest_level] == 0) { |
7628 | path->lowest_level = lowest_level; | |
7629 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
7630 | 0, 1); | |
7631 | BUG_ON(ret); | |
7632 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
7633 | eb = path->nodes[level]; | |
7634 | if (!eb || eb == reloc_root->node) | |
7635 | break; | |
7636 | nodes[level] = eb->start; | |
7637 | if (level == 0) | |
7638 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
7639 | else | |
7640 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
7641 | } | |
2b82032c YZ |
7642 | if (nodes[0] && |
7643 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
7644 | eb = path->nodes[0]; |
7645 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
7646 | group, reloc_inode); | |
7647 | BUG_ON(ret); | |
7648 | } | |
7649 | btrfs_release_path(reloc_root, path); | |
7650 | } else { | |
1a40e23b | 7651 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 7652 | lowest_level); |
1a40e23b ZY |
7653 | BUG_ON(ret); |
7654 | } | |
7655 | ||
1a40e23b ZY |
7656 | /* |
7657 | * replace tree blocks in the fs tree with tree blocks in | |
7658 | * the reloc tree. | |
7659 | */ | |
7660 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
7661 | BUG_ON(ret < 0); | |
7662 | ||
7663 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
7664 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
7665 | 0, 0); | |
7666 | BUG_ON(ret); | |
7667 | extent_buffer_get(path->nodes[0]); | |
7668 | eb = path->nodes[0]; | |
7669 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
7670 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
7671 | BUG_ON(ret); | |
7672 | free_extent_buffer(eb); | |
7673 | } | |
1a40e23b | 7674 | |
f82d02d9 | 7675 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 7676 | path->lowest_level = 0; |
1a40e23b ZY |
7677 | return 0; |
7678 | } | |
7679 | ||
d397712b | 7680 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7681 | struct btrfs_root *root, |
7682 | struct btrfs_path *path, | |
7683 | struct btrfs_key *first_key, | |
7684 | struct btrfs_ref_path *ref_path) | |
7685 | { | |
7686 | int ret; | |
1a40e23b ZY |
7687 | |
7688 | ret = relocate_one_path(trans, root, path, first_key, | |
7689 | ref_path, NULL, NULL); | |
7690 | BUG_ON(ret); | |
7691 | ||
1a40e23b ZY |
7692 | return 0; |
7693 | } | |
7694 | ||
d397712b | 7695 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7696 | struct btrfs_root *extent_root, |
7697 | struct btrfs_path *path, | |
7698 | struct btrfs_key *extent_key) | |
7699 | { | |
7700 | int ret; | |
7701 | ||
1a40e23b ZY |
7702 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
7703 | if (ret) | |
7704 | goto out; | |
7705 | ret = btrfs_del_item(trans, extent_root, path); | |
7706 | out: | |
7707 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
7708 | return ret; |
7709 | } | |
7710 | ||
d397712b | 7711 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
7712 | struct btrfs_ref_path *ref_path) |
7713 | { | |
7714 | struct btrfs_key root_key; | |
7715 | ||
7716 | root_key.objectid = ref_path->root_objectid; | |
7717 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
7718 | if (is_cowonly_root(ref_path->root_objectid)) | |
7719 | root_key.offset = 0; | |
7720 | else | |
7721 | root_key.offset = (u64)-1; | |
7722 | ||
7723 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
7724 | } | |
7725 | ||
d397712b | 7726 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
1a40e23b ZY |
7727 | struct btrfs_path *path, |
7728 | struct btrfs_key *extent_key, | |
7729 | struct btrfs_block_group_cache *group, | |
7730 | struct inode *reloc_inode, int pass) | |
7731 | { | |
7732 | struct btrfs_trans_handle *trans; | |
7733 | struct btrfs_root *found_root; | |
7734 | struct btrfs_ref_path *ref_path = NULL; | |
7735 | struct disk_extent *new_extents = NULL; | |
7736 | int nr_extents = 0; | |
7737 | int loops; | |
7738 | int ret; | |
7739 | int level; | |
7740 | struct btrfs_key first_key; | |
7741 | u64 prev_block = 0; | |
7742 | ||
1a40e23b ZY |
7743 | |
7744 | trans = btrfs_start_transaction(extent_root, 1); | |
7745 | BUG_ON(!trans); | |
7746 | ||
7747 | if (extent_key->objectid == 0) { | |
7748 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
7749 | goto out; | |
7750 | } | |
7751 | ||
7752 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
7753 | if (!ref_path) { | |
d397712b CM |
7754 | ret = -ENOMEM; |
7755 | goto out; | |
1a40e23b ZY |
7756 | } |
7757 | ||
7758 | for (loops = 0; ; loops++) { | |
7759 | if (loops == 0) { | |
7760 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
7761 | extent_key->objectid); | |
7762 | } else { | |
7763 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
7764 | } | |
7765 | if (ret < 0) | |
7766 | goto out; | |
7767 | if (ret > 0) | |
7768 | break; | |
7769 | ||
7770 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
7771 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
7772 | continue; | |
7773 | ||
7774 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
7775 | BUG_ON(!found_root); | |
7776 | /* | |
7777 | * for reference counted tree, only process reference paths | |
7778 | * rooted at the latest committed root. | |
7779 | */ | |
7780 | if (found_root->ref_cows && | |
7781 | ref_path->root_generation != found_root->root_key.offset) | |
7782 | continue; | |
7783 | ||
7784 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
7785 | if (pass == 0) { | |
7786 | /* | |
7787 | * copy data extents to new locations | |
7788 | */ | |
7789 | u64 group_start = group->key.objectid; | |
7790 | ret = relocate_data_extent(reloc_inode, | |
7791 | extent_key, | |
7792 | group_start); | |
7793 | if (ret < 0) | |
7794 | goto out; | |
7795 | break; | |
7796 | } | |
7797 | level = 0; | |
7798 | } else { | |
7799 | level = ref_path->owner_objectid; | |
7800 | } | |
7801 | ||
7802 | if (prev_block != ref_path->nodes[level]) { | |
7803 | struct extent_buffer *eb; | |
7804 | u64 block_start = ref_path->nodes[level]; | |
7805 | u64 block_size = btrfs_level_size(found_root, level); | |
7806 | ||
7807 | eb = read_tree_block(found_root, block_start, | |
7808 | block_size, 0); | |
7809 | btrfs_tree_lock(eb); | |
7810 | BUG_ON(level != btrfs_header_level(eb)); | |
7811 | ||
7812 | if (level == 0) | |
7813 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
7814 | else | |
7815 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
7816 | ||
7817 | btrfs_tree_unlock(eb); | |
7818 | free_extent_buffer(eb); | |
7819 | prev_block = block_start; | |
7820 | } | |
7821 | ||
24562425 | 7822 | mutex_lock(&extent_root->fs_info->trans_mutex); |
e4404d6e | 7823 | btrfs_record_root_in_trans(found_root); |
24562425 | 7824 | mutex_unlock(&extent_root->fs_info->trans_mutex); |
e4404d6e YZ |
7825 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
7826 | /* | |
7827 | * try to update data extent references while | |
7828 | * keeping metadata shared between snapshots. | |
7829 | */ | |
7830 | if (pass == 1) { | |
7831 | ret = relocate_one_path(trans, found_root, | |
7832 | path, &first_key, ref_path, | |
7833 | group, reloc_inode); | |
7834 | if (ret < 0) | |
7835 | goto out; | |
7836 | continue; | |
7837 | } | |
1a40e23b ZY |
7838 | /* |
7839 | * use fallback method to process the remaining | |
7840 | * references. | |
7841 | */ | |
7842 | if (!new_extents) { | |
7843 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
7844 | new_extents = kmalloc(sizeof(*new_extents), |
7845 | GFP_NOFS); | |
7846 | nr_extents = 1; | |
1a40e23b ZY |
7847 | ret = get_new_locations(reloc_inode, |
7848 | extent_key, | |
d899e052 | 7849 | group_start, 1, |
1a40e23b ZY |
7850 | &new_extents, |
7851 | &nr_extents); | |
d899e052 | 7852 | if (ret) |
1a40e23b ZY |
7853 | goto out; |
7854 | } | |
1a40e23b ZY |
7855 | ret = replace_one_extent(trans, found_root, |
7856 | path, extent_key, | |
7857 | &first_key, ref_path, | |
7858 | new_extents, nr_extents); | |
e4404d6e | 7859 | } else { |
1a40e23b ZY |
7860 | ret = relocate_tree_block(trans, found_root, path, |
7861 | &first_key, ref_path); | |
1a40e23b ZY |
7862 | } |
7863 | if (ret < 0) | |
7864 | goto out; | |
7865 | } | |
7866 | ret = 0; | |
7867 | out: | |
7868 | btrfs_end_transaction(trans, extent_root); | |
7869 | kfree(new_extents); | |
7870 | kfree(ref_path); | |
1a40e23b ZY |
7871 | return ret; |
7872 | } | |
5d4f98a2 | 7873 | #endif |
1a40e23b | 7874 | |
ec44a35c CM |
7875 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7876 | { | |
7877 | u64 num_devices; | |
7878 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
7879 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
7880 | ||
2b82032c | 7881 | num_devices = root->fs_info->fs_devices->rw_devices; |
ec44a35c CM |
7882 | if (num_devices == 1) { |
7883 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7884 | stripped = flags & ~stripped; | |
7885 | ||
7886 | /* turn raid0 into single device chunks */ | |
7887 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7888 | return stripped; | |
7889 | ||
7890 | /* turn mirroring into duplication */ | |
7891 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7892 | BTRFS_BLOCK_GROUP_RAID10)) | |
7893 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
7894 | return flags; | |
7895 | } else { | |
7896 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7897 | if (flags & stripped) |
7898 | return flags; | |
7899 | ||
7900 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7901 | stripped = flags & ~stripped; | |
7902 | ||
7903 | /* switch duplicated blocks with raid1 */ | |
7904 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7905 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7906 | ||
7907 | /* turn single device chunks into raid0 */ | |
7908 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
7909 | } | |
7910 | return flags; | |
7911 | } | |
7912 | ||
f0486c68 | 7913 | static int set_block_group_ro(struct btrfs_block_group_cache *cache) |
0ef3e66b | 7914 | { |
f0486c68 YZ |
7915 | struct btrfs_space_info *sinfo = cache->space_info; |
7916 | u64 num_bytes; | |
7917 | int ret = -ENOSPC; | |
0ef3e66b | 7918 | |
f0486c68 YZ |
7919 | if (cache->ro) |
7920 | return 0; | |
c286ac48 | 7921 | |
f0486c68 YZ |
7922 | spin_lock(&sinfo->lock); |
7923 | spin_lock(&cache->lock); | |
7924 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7925 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7926 | ||
7927 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
7928 | sinfo->bytes_may_use + sinfo->bytes_readonly + | |
7929 | cache->reserved_pinned + num_bytes < sinfo->total_bytes) { | |
7930 | sinfo->bytes_readonly += num_bytes; | |
7931 | sinfo->bytes_reserved += cache->reserved_pinned; | |
7932 | cache->reserved_pinned = 0; | |
7933 | cache->ro = 1; | |
7934 | ret = 0; | |
7935 | } | |
7936 | spin_unlock(&cache->lock); | |
7937 | spin_unlock(&sinfo->lock); | |
7938 | return ret; | |
7939 | } | |
7d9eb12c | 7940 | |
f0486c68 YZ |
7941 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7942 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7943 | |
f0486c68 YZ |
7944 | { |
7945 | struct btrfs_trans_handle *trans; | |
7946 | u64 alloc_flags; | |
7947 | int ret; | |
7d9eb12c | 7948 | |
f0486c68 | 7949 | BUG_ON(cache->ro); |
0ef3e66b | 7950 | |
f0486c68 YZ |
7951 | trans = btrfs_join_transaction(root, 1); |
7952 | BUG_ON(IS_ERR(trans)); | |
5d4f98a2 | 7953 | |
f0486c68 YZ |
7954 | alloc_flags = update_block_group_flags(root, cache->flags); |
7955 | if (alloc_flags != cache->flags) | |
7956 | do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); | |
5d4f98a2 | 7957 | |
f0486c68 YZ |
7958 | ret = set_block_group_ro(cache); |
7959 | if (!ret) | |
7960 | goto out; | |
7961 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
7962 | ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); | |
7963 | if (ret < 0) | |
7964 | goto out; | |
7965 | ret = set_block_group_ro(cache); | |
7966 | out: | |
7967 | btrfs_end_transaction(trans, root); | |
7968 | return ret; | |
7969 | } | |
5d4f98a2 | 7970 | |
f0486c68 YZ |
7971 | int btrfs_set_block_group_rw(struct btrfs_root *root, |
7972 | struct btrfs_block_group_cache *cache) | |
5d4f98a2 | 7973 | { |
f0486c68 YZ |
7974 | struct btrfs_space_info *sinfo = cache->space_info; |
7975 | u64 num_bytes; | |
7976 | ||
7977 | BUG_ON(!cache->ro); | |
7978 | ||
7979 | spin_lock(&sinfo->lock); | |
7980 | spin_lock(&cache->lock); | |
7981 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7982 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7983 | sinfo->bytes_readonly -= num_bytes; | |
7984 | cache->ro = 0; | |
7985 | spin_unlock(&cache->lock); | |
7986 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
7987 | return 0; |
7988 | } | |
7989 | ||
ba1bf481 JB |
7990 | /* |
7991 | * checks to see if its even possible to relocate this block group. | |
7992 | * | |
7993 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
7994 | * ok to go ahead and try. | |
7995 | */ | |
7996 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 7997 | { |
ba1bf481 JB |
7998 | struct btrfs_block_group_cache *block_group; |
7999 | struct btrfs_space_info *space_info; | |
8000 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
8001 | struct btrfs_device *device; | |
8002 | int full = 0; | |
8003 | int ret = 0; | |
1a40e23b | 8004 | |
ba1bf481 | 8005 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 8006 | |
ba1bf481 JB |
8007 | /* odd, couldn't find the block group, leave it alone */ |
8008 | if (!block_group) | |
8009 | return -1; | |
1a40e23b | 8010 | |
ba1bf481 JB |
8011 | /* no bytes used, we're good */ |
8012 | if (!btrfs_block_group_used(&block_group->item)) | |
1a40e23b ZY |
8013 | goto out; |
8014 | ||
ba1bf481 JB |
8015 | space_info = block_group->space_info; |
8016 | spin_lock(&space_info->lock); | |
17d217fe | 8017 | |
ba1bf481 | 8018 | full = space_info->full; |
17d217fe | 8019 | |
ba1bf481 JB |
8020 | /* |
8021 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
8022 | * relocate it unless we're able to allocate a new chunk below. |
8023 | * | |
8024 | * Otherwise, we need to make sure we have room in the space to handle | |
8025 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 8026 | */ |
7ce618db CM |
8027 | if ((space_info->total_bytes != block_group->key.offset) && |
8028 | (space_info->bytes_used + space_info->bytes_reserved + | |
ba1bf481 JB |
8029 | space_info->bytes_pinned + space_info->bytes_readonly + |
8030 | btrfs_block_group_used(&block_group->item) < | |
7ce618db | 8031 | space_info->total_bytes)) { |
ba1bf481 JB |
8032 | spin_unlock(&space_info->lock); |
8033 | goto out; | |
17d217fe | 8034 | } |
ba1bf481 | 8035 | spin_unlock(&space_info->lock); |
ea8c2819 | 8036 | |
ba1bf481 JB |
8037 | /* |
8038 | * ok we don't have enough space, but maybe we have free space on our | |
8039 | * devices to allocate new chunks for relocation, so loop through our | |
8040 | * alloc devices and guess if we have enough space. However, if we | |
8041 | * were marked as full, then we know there aren't enough chunks, and we | |
8042 | * can just return. | |
8043 | */ | |
8044 | ret = -1; | |
8045 | if (full) | |
8046 | goto out; | |
ea8c2819 | 8047 | |
ba1bf481 JB |
8048 | mutex_lock(&root->fs_info->chunk_mutex); |
8049 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
8050 | u64 min_free = btrfs_block_group_used(&block_group->item); | |
8051 | u64 dev_offset, max_avail; | |
56bec294 | 8052 | |
ba1bf481 JB |
8053 | /* |
8054 | * check to make sure we can actually find a chunk with enough | |
8055 | * space to fit our block group in. | |
8056 | */ | |
8057 | if (device->total_bytes > device->bytes_used + min_free) { | |
8058 | ret = find_free_dev_extent(NULL, device, min_free, | |
8059 | &dev_offset, &max_avail); | |
8060 | if (!ret) | |
73e48b27 | 8061 | break; |
ba1bf481 | 8062 | ret = -1; |
725c8463 | 8063 | } |
edbd8d4e | 8064 | } |
ba1bf481 | 8065 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 8066 | out: |
ba1bf481 | 8067 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
8068 | return ret; |
8069 | } | |
8070 | ||
b2950863 CH |
8071 | static int find_first_block_group(struct btrfs_root *root, |
8072 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 8073 | { |
925baedd | 8074 | int ret = 0; |
0b86a832 CM |
8075 | struct btrfs_key found_key; |
8076 | struct extent_buffer *leaf; | |
8077 | int slot; | |
edbd8d4e | 8078 | |
0b86a832 CM |
8079 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
8080 | if (ret < 0) | |
925baedd CM |
8081 | goto out; |
8082 | ||
d397712b | 8083 | while (1) { |
0b86a832 | 8084 | slot = path->slots[0]; |
edbd8d4e | 8085 | leaf = path->nodes[0]; |
0b86a832 CM |
8086 | if (slot >= btrfs_header_nritems(leaf)) { |
8087 | ret = btrfs_next_leaf(root, path); | |
8088 | if (ret == 0) | |
8089 | continue; | |
8090 | if (ret < 0) | |
925baedd | 8091 | goto out; |
0b86a832 | 8092 | break; |
edbd8d4e | 8093 | } |
0b86a832 | 8094 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 8095 | |
0b86a832 | 8096 | if (found_key.objectid >= key->objectid && |
925baedd CM |
8097 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
8098 | ret = 0; | |
8099 | goto out; | |
8100 | } | |
0b86a832 | 8101 | path->slots[0]++; |
edbd8d4e | 8102 | } |
925baedd | 8103 | out: |
0b86a832 | 8104 | return ret; |
edbd8d4e CM |
8105 | } |
8106 | ||
0af3d00b JB |
8107 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
8108 | { | |
8109 | struct btrfs_block_group_cache *block_group; | |
8110 | u64 last = 0; | |
8111 | ||
8112 | while (1) { | |
8113 | struct inode *inode; | |
8114 | ||
8115 | block_group = btrfs_lookup_first_block_group(info, last); | |
8116 | while (block_group) { | |
8117 | spin_lock(&block_group->lock); | |
8118 | if (block_group->iref) | |
8119 | break; | |
8120 | spin_unlock(&block_group->lock); | |
8121 | block_group = next_block_group(info->tree_root, | |
8122 | block_group); | |
8123 | } | |
8124 | if (!block_group) { | |
8125 | if (last == 0) | |
8126 | break; | |
8127 | last = 0; | |
8128 | continue; | |
8129 | } | |
8130 | ||
8131 | inode = block_group->inode; | |
8132 | block_group->iref = 0; | |
8133 | block_group->inode = NULL; | |
8134 | spin_unlock(&block_group->lock); | |
8135 | iput(inode); | |
8136 | last = block_group->key.objectid + block_group->key.offset; | |
8137 | btrfs_put_block_group(block_group); | |
8138 | } | |
8139 | } | |
8140 | ||
1a40e23b ZY |
8141 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
8142 | { | |
8143 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 8144 | struct btrfs_space_info *space_info; |
11833d66 | 8145 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
8146 | struct rb_node *n; |
8147 | ||
11833d66 YZ |
8148 | down_write(&info->extent_commit_sem); |
8149 | while (!list_empty(&info->caching_block_groups)) { | |
8150 | caching_ctl = list_entry(info->caching_block_groups.next, | |
8151 | struct btrfs_caching_control, list); | |
8152 | list_del(&caching_ctl->list); | |
8153 | put_caching_control(caching_ctl); | |
8154 | } | |
8155 | up_write(&info->extent_commit_sem); | |
8156 | ||
1a40e23b ZY |
8157 | spin_lock(&info->block_group_cache_lock); |
8158 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
8159 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
8160 | cache_node); | |
1a40e23b ZY |
8161 | rb_erase(&block_group->cache_node, |
8162 | &info->block_group_cache_tree); | |
d899e052 YZ |
8163 | spin_unlock(&info->block_group_cache_lock); |
8164 | ||
80eb234a | 8165 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 8166 | list_del(&block_group->list); |
80eb234a | 8167 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 8168 | |
817d52f8 | 8169 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8170 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8171 | |
8172 | btrfs_remove_free_space_cache(block_group); | |
11dfe35a | 8173 | btrfs_put_block_group(block_group); |
d899e052 YZ |
8174 | |
8175 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
8176 | } |
8177 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
8178 | |
8179 | /* now that all the block groups are freed, go through and | |
8180 | * free all the space_info structs. This is only called during | |
8181 | * the final stages of unmount, and so we know nobody is | |
8182 | * using them. We call synchronize_rcu() once before we start, | |
8183 | * just to be on the safe side. | |
8184 | */ | |
8185 | synchronize_rcu(); | |
8186 | ||
8929ecfa YZ |
8187 | release_global_block_rsv(info); |
8188 | ||
4184ea7f CM |
8189 | while(!list_empty(&info->space_info)) { |
8190 | space_info = list_entry(info->space_info.next, | |
8191 | struct btrfs_space_info, | |
8192 | list); | |
f0486c68 YZ |
8193 | if (space_info->bytes_pinned > 0 || |
8194 | space_info->bytes_reserved > 0) { | |
8195 | WARN_ON(1); | |
8196 | dump_space_info(space_info, 0, 0); | |
8197 | } | |
4184ea7f CM |
8198 | list_del(&space_info->list); |
8199 | kfree(space_info); | |
8200 | } | |
1a40e23b ZY |
8201 | return 0; |
8202 | } | |
8203 | ||
b742bb82 YZ |
8204 | static void __link_block_group(struct btrfs_space_info *space_info, |
8205 | struct btrfs_block_group_cache *cache) | |
8206 | { | |
8207 | int index = get_block_group_index(cache); | |
8208 | ||
8209 | down_write(&space_info->groups_sem); | |
8210 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
8211 | up_write(&space_info->groups_sem); | |
8212 | } | |
8213 | ||
9078a3e1 CM |
8214 | int btrfs_read_block_groups(struct btrfs_root *root) |
8215 | { | |
8216 | struct btrfs_path *path; | |
8217 | int ret; | |
9078a3e1 | 8218 | struct btrfs_block_group_cache *cache; |
be744175 | 8219 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 8220 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
8221 | struct btrfs_key key; |
8222 | struct btrfs_key found_key; | |
5f39d397 | 8223 | struct extent_buffer *leaf; |
0af3d00b JB |
8224 | int need_clear = 0; |
8225 | u64 cache_gen; | |
96b5179d | 8226 | |
be744175 | 8227 | root = info->extent_root; |
9078a3e1 | 8228 | key.objectid = 0; |
0b86a832 | 8229 | key.offset = 0; |
9078a3e1 | 8230 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
8231 | path = btrfs_alloc_path(); |
8232 | if (!path) | |
8233 | return -ENOMEM; | |
8234 | ||
0af3d00b JB |
8235 | cache_gen = btrfs_super_cache_generation(&root->fs_info->super_copy); |
8236 | if (cache_gen != 0 && | |
8237 | btrfs_super_generation(&root->fs_info->super_copy) != cache_gen) | |
8238 | need_clear = 1; | |
88c2ba3b JB |
8239 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
8240 | need_clear = 1; | |
8216ef86 JB |
8241 | if (!btrfs_test_opt(root, SPACE_CACHE) && cache_gen) |
8242 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); | |
0af3d00b | 8243 | |
d397712b | 8244 | while (1) { |
0b86a832 | 8245 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
8246 | if (ret > 0) |
8247 | break; | |
0b86a832 CM |
8248 | if (ret != 0) |
8249 | goto error; | |
8250 | ||
5f39d397 CM |
8251 | leaf = path->nodes[0]; |
8252 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 8253 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 8254 | if (!cache) { |
0b86a832 | 8255 | ret = -ENOMEM; |
f0486c68 | 8256 | goto error; |
9078a3e1 | 8257 | } |
3e1ad54f | 8258 | |
d2fb3437 | 8259 | atomic_set(&cache->count, 1); |
c286ac48 | 8260 | spin_lock_init(&cache->lock); |
6226cb0a | 8261 | spin_lock_init(&cache->tree_lock); |
817d52f8 | 8262 | cache->fs_info = info; |
0f9dd46c | 8263 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8264 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 8265 | |
0af3d00b JB |
8266 | if (need_clear) |
8267 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
8268 | ||
96303081 JB |
8269 | /* |
8270 | * we only want to have 32k of ram per block group for keeping | |
8271 | * track of free space, and if we pass 1/2 of that we want to | |
8272 | * start converting things over to using bitmaps | |
8273 | */ | |
8274 | cache->extents_thresh = ((1024 * 32) / 2) / | |
8275 | sizeof(struct btrfs_free_space); | |
8276 | ||
5f39d397 CM |
8277 | read_extent_buffer(leaf, &cache->item, |
8278 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
8279 | sizeof(cache->item)); | |
9078a3e1 | 8280 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 8281 | |
9078a3e1 CM |
8282 | key.objectid = found_key.objectid + found_key.offset; |
8283 | btrfs_release_path(root, path); | |
0b86a832 | 8284 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
8285 | cache->sectorsize = root->sectorsize; |
8286 | ||
817d52f8 JB |
8287 | /* |
8288 | * check for two cases, either we are full, and therefore | |
8289 | * don't need to bother with the caching work since we won't | |
8290 | * find any space, or we are empty, and we can just add all | |
8291 | * the space in and be done with it. This saves us _alot_ of | |
8292 | * time, particularly in the full case. | |
8293 | */ | |
8294 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
1b2da372 | 8295 | exclude_super_stripes(root, cache); |
11833d66 | 8296 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8297 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8298 | free_excluded_extents(root, cache); |
817d52f8 | 8299 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 YZ |
8300 | exclude_super_stripes(root, cache); |
8301 | cache->last_byte_to_unpin = (u64)-1; | |
817d52f8 JB |
8302 | cache->cached = BTRFS_CACHE_FINISHED; |
8303 | add_new_free_space(cache, root->fs_info, | |
8304 | found_key.objectid, | |
8305 | found_key.objectid + | |
8306 | found_key.offset); | |
11833d66 | 8307 | free_excluded_extents(root, cache); |
817d52f8 | 8308 | } |
96b5179d | 8309 | |
6324fbf3 CM |
8310 | ret = update_space_info(info, cache->flags, found_key.offset, |
8311 | btrfs_block_group_used(&cache->item), | |
8312 | &space_info); | |
8313 | BUG_ON(ret); | |
8314 | cache->space_info = space_info; | |
1b2da372 | 8315 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8316 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8317 | spin_unlock(&cache->space_info->lock); |
8318 | ||
b742bb82 | 8319 | __link_block_group(space_info, cache); |
0f9dd46c JB |
8320 | |
8321 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
8322 | BUG_ON(ret); | |
75ccf47d CM |
8323 | |
8324 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 8325 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
f0486c68 | 8326 | set_block_group_ro(cache); |
9078a3e1 | 8327 | } |
b742bb82 YZ |
8328 | |
8329 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8330 | if (!(get_alloc_profile(root, space_info->flags) & | |
8331 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8332 | BTRFS_BLOCK_GROUP_RAID1 | | |
8333 | BTRFS_BLOCK_GROUP_DUP))) | |
8334 | continue; | |
8335 | /* | |
8336 | * avoid allocating from un-mirrored block group if there are | |
8337 | * mirrored block groups. | |
8338 | */ | |
8339 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
f0486c68 | 8340 | set_block_group_ro(cache); |
b742bb82 | 8341 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
f0486c68 | 8342 | set_block_group_ro(cache); |
9078a3e1 | 8343 | } |
f0486c68 YZ |
8344 | |
8345 | init_global_block_rsv(info); | |
0b86a832 CM |
8346 | ret = 0; |
8347 | error: | |
9078a3e1 | 8348 | btrfs_free_path(path); |
0b86a832 | 8349 | return ret; |
9078a3e1 | 8350 | } |
6324fbf3 CM |
8351 | |
8352 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
8353 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8354 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8355 | u64 size) |
8356 | { | |
8357 | int ret; | |
6324fbf3 CM |
8358 | struct btrfs_root *extent_root; |
8359 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8360 | |
8361 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8362 | |
12fcfd22 | 8363 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8364 | |
8f18cf13 | 8365 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8366 | if (!cache) |
8367 | return -ENOMEM; | |
8368 | ||
e17cade2 | 8369 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8370 | cache->key.offset = size; |
d2fb3437 | 8371 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 8372 | cache->sectorsize = root->sectorsize; |
0af3d00b | 8373 | cache->fs_info = root->fs_info; |
96303081 JB |
8374 | |
8375 | /* | |
8376 | * we only want to have 32k of ram per block group for keeping track | |
8377 | * of free space, and if we pass 1/2 of that we want to start | |
8378 | * converting things over to using bitmaps | |
8379 | */ | |
8380 | cache->extents_thresh = ((1024 * 32) / 2) / | |
8381 | sizeof(struct btrfs_free_space); | |
d2fb3437 | 8382 | atomic_set(&cache->count, 1); |
c286ac48 | 8383 | spin_lock_init(&cache->lock); |
6226cb0a | 8384 | spin_lock_init(&cache->tree_lock); |
0f9dd46c | 8385 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8386 | INIT_LIST_HEAD(&cache->cluster_list); |
0ef3e66b | 8387 | |
6324fbf3 | 8388 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8389 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8390 | cache->flags = type; | |
8391 | btrfs_set_block_group_flags(&cache->item, type); | |
8392 | ||
11833d66 | 8393 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8394 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 8395 | exclude_super_stripes(root, cache); |
96303081 | 8396 | |
817d52f8 JB |
8397 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8398 | chunk_offset + size); | |
8399 | ||
11833d66 YZ |
8400 | free_excluded_extents(root, cache); |
8401 | ||
6324fbf3 CM |
8402 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8403 | &cache->space_info); | |
8404 | BUG_ON(ret); | |
1b2da372 JB |
8405 | |
8406 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8407 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8408 | spin_unlock(&cache->space_info->lock); |
8409 | ||
b742bb82 | 8410 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8411 | |
0f9dd46c JB |
8412 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8413 | BUG_ON(ret); | |
c286ac48 | 8414 | |
6324fbf3 CM |
8415 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
8416 | sizeof(cache->item)); | |
8417 | BUG_ON(ret); | |
8418 | ||
d18a2c44 | 8419 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8420 | |
6324fbf3 CM |
8421 | return 0; |
8422 | } | |
1a40e23b ZY |
8423 | |
8424 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
8425 | struct btrfs_root *root, u64 group_start) | |
8426 | { | |
8427 | struct btrfs_path *path; | |
8428 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8429 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8430 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8431 | struct btrfs_key key; |
0af3d00b | 8432 | struct inode *inode; |
1a40e23b | 8433 | int ret; |
89a55897 | 8434 | int factor; |
1a40e23b | 8435 | |
1a40e23b ZY |
8436 | root = root->fs_info->extent_root; |
8437 | ||
8438 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8439 | BUG_ON(!block_group); | |
c146afad | 8440 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
8441 | |
8442 | memcpy(&key, &block_group->key, sizeof(key)); | |
89a55897 JB |
8443 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8444 | BTRFS_BLOCK_GROUP_RAID1 | | |
8445 | BTRFS_BLOCK_GROUP_RAID10)) | |
8446 | factor = 2; | |
8447 | else | |
8448 | factor = 1; | |
1a40e23b | 8449 | |
44fb5511 CM |
8450 | /* make sure this block group isn't part of an allocation cluster */ |
8451 | cluster = &root->fs_info->data_alloc_cluster; | |
8452 | spin_lock(&cluster->refill_lock); | |
8453 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8454 | spin_unlock(&cluster->refill_lock); | |
8455 | ||
8456 | /* | |
8457 | * make sure this block group isn't part of a metadata | |
8458 | * allocation cluster | |
8459 | */ | |
8460 | cluster = &root->fs_info->meta_alloc_cluster; | |
8461 | spin_lock(&cluster->refill_lock); | |
8462 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8463 | spin_unlock(&cluster->refill_lock); | |
8464 | ||
1a40e23b ZY |
8465 | path = btrfs_alloc_path(); |
8466 | BUG_ON(!path); | |
8467 | ||
0af3d00b JB |
8468 | inode = lookup_free_space_inode(root, block_group, path); |
8469 | if (!IS_ERR(inode)) { | |
8470 | btrfs_orphan_add(trans, inode); | |
8471 | clear_nlink(inode); | |
8472 | /* One for the block groups ref */ | |
8473 | spin_lock(&block_group->lock); | |
8474 | if (block_group->iref) { | |
8475 | block_group->iref = 0; | |
8476 | block_group->inode = NULL; | |
8477 | spin_unlock(&block_group->lock); | |
8478 | iput(inode); | |
8479 | } else { | |
8480 | spin_unlock(&block_group->lock); | |
8481 | } | |
8482 | /* One for our lookup ref */ | |
8483 | iput(inode); | |
8484 | } | |
8485 | ||
8486 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8487 | key.offset = block_group->key.objectid; | |
8488 | key.type = 0; | |
8489 | ||
8490 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8491 | if (ret < 0) | |
8492 | goto out; | |
8493 | if (ret > 0) | |
8494 | btrfs_release_path(tree_root, path); | |
8495 | if (ret == 0) { | |
8496 | ret = btrfs_del_item(trans, tree_root, path); | |
8497 | if (ret) | |
8498 | goto out; | |
8499 | btrfs_release_path(tree_root, path); | |
8500 | } | |
8501 | ||
3dfdb934 | 8502 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8503 | rb_erase(&block_group->cache_node, |
8504 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 | 8505 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8506 | |
80eb234a | 8507 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8508 | /* |
8509 | * we must use list_del_init so people can check to see if they | |
8510 | * are still on the list after taking the semaphore | |
8511 | */ | |
8512 | list_del_init(&block_group->list); | |
80eb234a | 8513 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8514 | |
817d52f8 | 8515 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8516 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8517 | |
8518 | btrfs_remove_free_space_cache(block_group); | |
8519 | ||
c146afad YZ |
8520 | spin_lock(&block_group->space_info->lock); |
8521 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8522 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8523 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8524 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8525 | |
0af3d00b JB |
8526 | memcpy(&key, &block_group->key, sizeof(key)); |
8527 | ||
283bb197 | 8528 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8529 | |
fa9c0d79 CM |
8530 | btrfs_put_block_group(block_group); |
8531 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8532 | |
8533 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8534 | if (ret > 0) | |
8535 | ret = -EIO; | |
8536 | if (ret < 0) | |
8537 | goto out; | |
8538 | ||
8539 | ret = btrfs_del_item(trans, root, path); | |
8540 | out: | |
8541 | btrfs_free_path(path); | |
8542 | return ret; | |
8543 | } |