Commit | Line | Data |
---|---|---|
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); | |
dde5abee JB |
242 | return NULL; |
243 | } | |
244 | ||
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, | |
b8399dee | 432 | struct btrfs_root *root, |
9d66e233 | 433 | int load_cache_only) |
817d52f8 | 434 | { |
11833d66 YZ |
435 | struct btrfs_fs_info *fs_info = cache->fs_info; |
436 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
437 | struct task_struct *tsk; |
438 | int ret = 0; | |
439 | ||
11833d66 YZ |
440 | smp_mb(); |
441 | if (cache->cached != BTRFS_CACHE_NO) | |
442 | return 0; | |
443 | ||
9d66e233 JB |
444 | /* |
445 | * We can't do the read from on-disk cache during a commit since we need | |
b8399dee JB |
446 | * to have the normal tree locking. Also if we are currently trying to |
447 | * allocate blocks for the tree root we can't do the fast caching since | |
448 | * we likely hold important locks. | |
9d66e233 | 449 | */ |
b8399dee JB |
450 | if (!trans->transaction->in_commit && |
451 | (root && root != root->fs_info->tree_root)) { | |
9d66e233 JB |
452 | spin_lock(&cache->lock); |
453 | if (cache->cached != BTRFS_CACHE_NO) { | |
454 | spin_unlock(&cache->lock); | |
455 | return 0; | |
456 | } | |
457 | cache->cached = BTRFS_CACHE_STARTED; | |
458 | spin_unlock(&cache->lock); | |
459 | ||
460 | ret = load_free_space_cache(fs_info, cache); | |
461 | ||
462 | spin_lock(&cache->lock); | |
463 | if (ret == 1) { | |
464 | cache->cached = BTRFS_CACHE_FINISHED; | |
465 | cache->last_byte_to_unpin = (u64)-1; | |
466 | } else { | |
467 | cache->cached = BTRFS_CACHE_NO; | |
468 | } | |
469 | spin_unlock(&cache->lock); | |
470 | if (ret == 1) | |
471 | return 0; | |
472 | } | |
473 | ||
474 | if (load_cache_only) | |
475 | return 0; | |
476 | ||
11833d66 YZ |
477 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_KERNEL); |
478 | BUG_ON(!caching_ctl); | |
479 | ||
480 | INIT_LIST_HEAD(&caching_ctl->list); | |
481 | mutex_init(&caching_ctl->mutex); | |
482 | init_waitqueue_head(&caching_ctl->wait); | |
483 | caching_ctl->block_group = cache; | |
484 | caching_ctl->progress = cache->key.objectid; | |
485 | /* one for caching kthread, one for caching block group list */ | |
486 | atomic_set(&caching_ctl->count, 2); | |
487 | ||
817d52f8 JB |
488 | spin_lock(&cache->lock); |
489 | if (cache->cached != BTRFS_CACHE_NO) { | |
490 | spin_unlock(&cache->lock); | |
11833d66 YZ |
491 | kfree(caching_ctl); |
492 | return 0; | |
817d52f8 | 493 | } |
11833d66 | 494 | cache->caching_ctl = caching_ctl; |
817d52f8 JB |
495 | cache->cached = BTRFS_CACHE_STARTED; |
496 | spin_unlock(&cache->lock); | |
497 | ||
11833d66 YZ |
498 | down_write(&fs_info->extent_commit_sem); |
499 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); | |
500 | up_write(&fs_info->extent_commit_sem); | |
501 | ||
502 | atomic_inc(&cache->space_info->caching_threads); | |
11dfe35a | 503 | btrfs_get_block_group(cache); |
11833d66 | 504 | |
817d52f8 JB |
505 | tsk = kthread_run(caching_kthread, cache, "btrfs-cache-%llu\n", |
506 | cache->key.objectid); | |
507 | if (IS_ERR(tsk)) { | |
508 | ret = PTR_ERR(tsk); | |
509 | printk(KERN_ERR "error running thread %d\n", ret); | |
510 | BUG(); | |
511 | } | |
512 | ||
ef8bbdfe | 513 | return ret; |
e37c9e69 CM |
514 | } |
515 | ||
0f9dd46c JB |
516 | /* |
517 | * return the block group that starts at or after bytenr | |
518 | */ | |
d397712b CM |
519 | static struct btrfs_block_group_cache * |
520 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 521 | { |
0f9dd46c | 522 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 523 | |
0f9dd46c | 524 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 525 | |
0f9dd46c | 526 | return cache; |
0ef3e66b CM |
527 | } |
528 | ||
0f9dd46c | 529 | /* |
9f55684c | 530 | * return the block group that contains the given bytenr |
0f9dd46c | 531 | */ |
d397712b CM |
532 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
533 | struct btrfs_fs_info *info, | |
534 | u64 bytenr) | |
be744175 | 535 | { |
0f9dd46c | 536 | struct btrfs_block_group_cache *cache; |
be744175 | 537 | |
0f9dd46c | 538 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 539 | |
0f9dd46c | 540 | return cache; |
be744175 | 541 | } |
0b86a832 | 542 | |
0f9dd46c JB |
543 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
544 | u64 flags) | |
6324fbf3 | 545 | { |
0f9dd46c | 546 | struct list_head *head = &info->space_info; |
0f9dd46c | 547 | struct btrfs_space_info *found; |
4184ea7f | 548 | |
b742bb82 YZ |
549 | flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM | |
550 | BTRFS_BLOCK_GROUP_METADATA; | |
551 | ||
4184ea7f CM |
552 | rcu_read_lock(); |
553 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 554 | if (found->flags & flags) { |
4184ea7f | 555 | rcu_read_unlock(); |
0f9dd46c | 556 | return found; |
4184ea7f | 557 | } |
0f9dd46c | 558 | } |
4184ea7f | 559 | rcu_read_unlock(); |
0f9dd46c | 560 | return NULL; |
6324fbf3 CM |
561 | } |
562 | ||
4184ea7f CM |
563 | /* |
564 | * after adding space to the filesystem, we need to clear the full flags | |
565 | * on all the space infos. | |
566 | */ | |
567 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
568 | { | |
569 | struct list_head *head = &info->space_info; | |
570 | struct btrfs_space_info *found; | |
571 | ||
572 | rcu_read_lock(); | |
573 | list_for_each_entry_rcu(found, head, list) | |
574 | found->full = 0; | |
575 | rcu_read_unlock(); | |
576 | } | |
577 | ||
80eb234a JB |
578 | static u64 div_factor(u64 num, int factor) |
579 | { | |
580 | if (factor == 10) | |
581 | return num; | |
582 | num *= factor; | |
583 | do_div(num, 10); | |
584 | return num; | |
585 | } | |
586 | ||
e5bc2458 CM |
587 | static u64 div_factor_fine(u64 num, int factor) |
588 | { | |
589 | if (factor == 100) | |
590 | return num; | |
591 | num *= factor; | |
592 | do_div(num, 100); | |
593 | return num; | |
594 | } | |
595 | ||
d2fb3437 YZ |
596 | u64 btrfs_find_block_group(struct btrfs_root *root, |
597 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 598 | { |
96b5179d | 599 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 600 | u64 used; |
d2fb3437 YZ |
601 | u64 last = max(search_hint, search_start); |
602 | u64 group_start = 0; | |
31f3c99b | 603 | int full_search = 0; |
d2fb3437 | 604 | int factor = 9; |
0ef3e66b | 605 | int wrapped = 0; |
31f3c99b | 606 | again: |
e8569813 ZY |
607 | while (1) { |
608 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
609 | if (!cache) |
610 | break; | |
96b5179d | 611 | |
c286ac48 | 612 | spin_lock(&cache->lock); |
96b5179d CM |
613 | last = cache->key.objectid + cache->key.offset; |
614 | used = btrfs_block_group_used(&cache->item); | |
615 | ||
d2fb3437 YZ |
616 | if ((full_search || !cache->ro) && |
617 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 618 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
619 | div_factor(cache->key.offset, factor)) { |
620 | group_start = cache->key.objectid; | |
c286ac48 | 621 | spin_unlock(&cache->lock); |
fa9c0d79 | 622 | btrfs_put_block_group(cache); |
8790d502 CM |
623 | goto found; |
624 | } | |
6324fbf3 | 625 | } |
c286ac48 | 626 | spin_unlock(&cache->lock); |
fa9c0d79 | 627 | btrfs_put_block_group(cache); |
de428b63 | 628 | cond_resched(); |
cd1bc465 | 629 | } |
0ef3e66b CM |
630 | if (!wrapped) { |
631 | last = search_start; | |
632 | wrapped = 1; | |
633 | goto again; | |
634 | } | |
635 | if (!full_search && factor < 10) { | |
be744175 | 636 | last = search_start; |
31f3c99b | 637 | full_search = 1; |
0ef3e66b | 638 | factor = 10; |
31f3c99b CM |
639 | goto again; |
640 | } | |
be744175 | 641 | found: |
d2fb3437 | 642 | return group_start; |
925baedd | 643 | } |
0f9dd46c | 644 | |
e02119d5 | 645 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 646 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
647 | { |
648 | int ret; | |
649 | struct btrfs_key key; | |
31840ae1 | 650 | struct btrfs_path *path; |
e02119d5 | 651 | |
31840ae1 ZY |
652 | path = btrfs_alloc_path(); |
653 | BUG_ON(!path); | |
e02119d5 CM |
654 | key.objectid = start; |
655 | key.offset = len; | |
656 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
657 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
658 | 0, 0); | |
31840ae1 | 659 | btrfs_free_path(path); |
7bb86316 CM |
660 | return ret; |
661 | } | |
662 | ||
a22285a6 YZ |
663 | /* |
664 | * helper function to lookup reference count and flags of extent. | |
665 | * | |
666 | * the head node for delayed ref is used to store the sum of all the | |
667 | * reference count modifications queued up in the rbtree. the head | |
668 | * node may also store the extent flags to set. This way you can check | |
669 | * to see what the reference count and extent flags would be if all of | |
670 | * the delayed refs are not processed. | |
671 | */ | |
672 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
673 | struct btrfs_root *root, u64 bytenr, | |
674 | u64 num_bytes, u64 *refs, u64 *flags) | |
675 | { | |
676 | struct btrfs_delayed_ref_head *head; | |
677 | struct btrfs_delayed_ref_root *delayed_refs; | |
678 | struct btrfs_path *path; | |
679 | struct btrfs_extent_item *ei; | |
680 | struct extent_buffer *leaf; | |
681 | struct btrfs_key key; | |
682 | u32 item_size; | |
683 | u64 num_refs; | |
684 | u64 extent_flags; | |
685 | int ret; | |
686 | ||
687 | path = btrfs_alloc_path(); | |
688 | if (!path) | |
689 | return -ENOMEM; | |
690 | ||
691 | key.objectid = bytenr; | |
692 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
693 | key.offset = num_bytes; | |
694 | if (!trans) { | |
695 | path->skip_locking = 1; | |
696 | path->search_commit_root = 1; | |
697 | } | |
698 | again: | |
699 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
700 | &key, path, 0, 0); | |
701 | if (ret < 0) | |
702 | goto out_free; | |
703 | ||
704 | if (ret == 0) { | |
705 | leaf = path->nodes[0]; | |
706 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
707 | if (item_size >= sizeof(*ei)) { | |
708 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
709 | struct btrfs_extent_item); | |
710 | num_refs = btrfs_extent_refs(leaf, ei); | |
711 | extent_flags = btrfs_extent_flags(leaf, ei); | |
712 | } else { | |
713 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
714 | struct btrfs_extent_item_v0 *ei0; | |
715 | BUG_ON(item_size != sizeof(*ei0)); | |
716 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
717 | struct btrfs_extent_item_v0); | |
718 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
719 | /* FIXME: this isn't correct for data */ | |
720 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
721 | #else | |
722 | BUG(); | |
723 | #endif | |
724 | } | |
725 | BUG_ON(num_refs == 0); | |
726 | } else { | |
727 | num_refs = 0; | |
728 | extent_flags = 0; | |
729 | ret = 0; | |
730 | } | |
731 | ||
732 | if (!trans) | |
733 | goto out; | |
734 | ||
735 | delayed_refs = &trans->transaction->delayed_refs; | |
736 | spin_lock(&delayed_refs->lock); | |
737 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
738 | if (head) { | |
739 | if (!mutex_trylock(&head->mutex)) { | |
740 | atomic_inc(&head->node.refs); | |
741 | spin_unlock(&delayed_refs->lock); | |
742 | ||
743 | btrfs_release_path(root->fs_info->extent_root, path); | |
744 | ||
745 | mutex_lock(&head->mutex); | |
746 | mutex_unlock(&head->mutex); | |
747 | btrfs_put_delayed_ref(&head->node); | |
748 | goto again; | |
749 | } | |
750 | if (head->extent_op && head->extent_op->update_flags) | |
751 | extent_flags |= head->extent_op->flags_to_set; | |
752 | else | |
753 | BUG_ON(num_refs == 0); | |
754 | ||
755 | num_refs += head->node.ref_mod; | |
756 | mutex_unlock(&head->mutex); | |
757 | } | |
758 | spin_unlock(&delayed_refs->lock); | |
759 | out: | |
760 | WARN_ON(num_refs == 0); | |
761 | if (refs) | |
762 | *refs = num_refs; | |
763 | if (flags) | |
764 | *flags = extent_flags; | |
765 | out_free: | |
766 | btrfs_free_path(path); | |
767 | return ret; | |
768 | } | |
769 | ||
d8d5f3e1 CM |
770 | /* |
771 | * Back reference rules. Back refs have three main goals: | |
772 | * | |
773 | * 1) differentiate between all holders of references to an extent so that | |
774 | * when a reference is dropped we can make sure it was a valid reference | |
775 | * before freeing the extent. | |
776 | * | |
777 | * 2) Provide enough information to quickly find the holders of an extent | |
778 | * if we notice a given block is corrupted or bad. | |
779 | * | |
780 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
781 | * maintenance. This is actually the same as #2, but with a slightly | |
782 | * different use case. | |
783 | * | |
5d4f98a2 YZ |
784 | * There are two kinds of back refs. The implicit back refs is optimized |
785 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
786 | * back refs of this kind provide information about the block's owner tree | |
787 | * and the pointer's key. These information allow us to find the block by | |
788 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
789 | * referenced by their owner trees. The location of tree block is recorded | |
790 | * in the back refs. Actually the full back refs is generic, and can be | |
791 | * used in all cases the implicit back refs is used. The major shortcoming | |
792 | * of the full back refs is its overhead. Every time a tree block gets | |
793 | * COWed, we have to update back refs entry for all pointers in it. | |
794 | * | |
795 | * For a newly allocated tree block, we use implicit back refs for | |
796 | * pointers in it. This means most tree related operations only involve | |
797 | * implicit back refs. For a tree block created in old transaction, the | |
798 | * only way to drop a reference to it is COW it. So we can detect the | |
799 | * event that tree block loses its owner tree's reference and do the | |
800 | * back refs conversion. | |
801 | * | |
802 | * When a tree block is COW'd through a tree, there are four cases: | |
803 | * | |
804 | * The reference count of the block is one and the tree is the block's | |
805 | * owner tree. Nothing to do in this case. | |
806 | * | |
807 | * The reference count of the block is one and the tree is not the | |
808 | * block's owner tree. In this case, full back refs is used for pointers | |
809 | * in the block. Remove these full back refs, add implicit back refs for | |
810 | * every pointers in the new block. | |
811 | * | |
812 | * The reference count of the block is greater than one and the tree is | |
813 | * the block's owner tree. In this case, implicit back refs is used for | |
814 | * pointers in the block. Add full back refs for every pointers in the | |
815 | * block, increase lower level extents' reference counts. The original | |
816 | * implicit back refs are entailed to the new block. | |
817 | * | |
818 | * The reference count of the block is greater than one and the tree is | |
819 | * not the block's owner tree. Add implicit back refs for every pointer in | |
820 | * the new block, increase lower level extents' reference count. | |
821 | * | |
822 | * Back Reference Key composing: | |
823 | * | |
824 | * The key objectid corresponds to the first byte in the extent, | |
825 | * The key type is used to differentiate between types of back refs. | |
826 | * There are different meanings of the key offset for different types | |
827 | * of back refs. | |
828 | * | |
d8d5f3e1 CM |
829 | * File extents can be referenced by: |
830 | * | |
831 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 832 | * - different files inside a single subvolume |
d8d5f3e1 CM |
833 | * - different offsets inside a file (bookend extents in file.c) |
834 | * | |
5d4f98a2 | 835 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
836 | * |
837 | * - Objectid of the subvolume root | |
d8d5f3e1 | 838 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
839 | * - original offset in the file |
840 | * - how many bookend extents | |
d8d5f3e1 | 841 | * |
5d4f98a2 YZ |
842 | * The key offset for the implicit back refs is hash of the first |
843 | * three fields. | |
d8d5f3e1 | 844 | * |
5d4f98a2 | 845 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 846 | * |
5d4f98a2 | 847 | * - number of pointers in the tree leaf |
d8d5f3e1 | 848 | * |
5d4f98a2 YZ |
849 | * The key offset for the implicit back refs is the first byte of |
850 | * the tree leaf | |
d8d5f3e1 | 851 | * |
5d4f98a2 YZ |
852 | * When a file extent is allocated, The implicit back refs is used. |
853 | * the fields are filled in: | |
d8d5f3e1 | 854 | * |
5d4f98a2 | 855 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 856 | * |
5d4f98a2 YZ |
857 | * When a file extent is removed file truncation, we find the |
858 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 859 | * |
5d4f98a2 | 860 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 861 | * |
5d4f98a2 | 862 | * Btree extents can be referenced by: |
d8d5f3e1 | 863 | * |
5d4f98a2 | 864 | * - Different subvolumes |
d8d5f3e1 | 865 | * |
5d4f98a2 YZ |
866 | * Both the implicit back refs and the full back refs for tree blocks |
867 | * only consist of key. The key offset for the implicit back refs is | |
868 | * objectid of block's owner tree. The key offset for the full back refs | |
869 | * is the first byte of parent block. | |
d8d5f3e1 | 870 | * |
5d4f98a2 YZ |
871 | * When implicit back refs is used, information about the lowest key and |
872 | * level of the tree block are required. These information are stored in | |
873 | * tree block info structure. | |
d8d5f3e1 | 874 | */ |
31840ae1 | 875 | |
5d4f98a2 YZ |
876 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
877 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
878 | struct btrfs_root *root, | |
879 | struct btrfs_path *path, | |
880 | u64 owner, u32 extra_size) | |
7bb86316 | 881 | { |
5d4f98a2 YZ |
882 | struct btrfs_extent_item *item; |
883 | struct btrfs_extent_item_v0 *ei0; | |
884 | struct btrfs_extent_ref_v0 *ref0; | |
885 | struct btrfs_tree_block_info *bi; | |
886 | struct extent_buffer *leaf; | |
7bb86316 | 887 | struct btrfs_key key; |
5d4f98a2 YZ |
888 | struct btrfs_key found_key; |
889 | u32 new_size = sizeof(*item); | |
890 | u64 refs; | |
891 | int ret; | |
892 | ||
893 | leaf = path->nodes[0]; | |
894 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
895 | ||
896 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
897 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
898 | struct btrfs_extent_item_v0); | |
899 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
900 | ||
901 | if (owner == (u64)-1) { | |
902 | while (1) { | |
903 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
904 | ret = btrfs_next_leaf(root, path); | |
905 | if (ret < 0) | |
906 | return ret; | |
907 | BUG_ON(ret > 0); | |
908 | leaf = path->nodes[0]; | |
909 | } | |
910 | btrfs_item_key_to_cpu(leaf, &found_key, | |
911 | path->slots[0]); | |
912 | BUG_ON(key.objectid != found_key.objectid); | |
913 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
914 | path->slots[0]++; | |
915 | continue; | |
916 | } | |
917 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
918 | struct btrfs_extent_ref_v0); | |
919 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
920 | break; | |
921 | } | |
922 | } | |
923 | btrfs_release_path(root, path); | |
924 | ||
925 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
926 | new_size += sizeof(*bi); | |
927 | ||
928 | new_size -= sizeof(*ei0); | |
929 | ret = btrfs_search_slot(trans, root, &key, path, | |
930 | new_size + extra_size, 1); | |
931 | if (ret < 0) | |
932 | return ret; | |
933 | BUG_ON(ret); | |
934 | ||
935 | ret = btrfs_extend_item(trans, root, path, new_size); | |
936 | BUG_ON(ret); | |
937 | ||
938 | leaf = path->nodes[0]; | |
939 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
940 | btrfs_set_extent_refs(leaf, item, refs); | |
941 | /* FIXME: get real generation */ | |
942 | btrfs_set_extent_generation(leaf, item, 0); | |
943 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
944 | btrfs_set_extent_flags(leaf, item, | |
945 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
946 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
947 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
948 | /* FIXME: get first key of the block */ | |
949 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
950 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
951 | } else { | |
952 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
953 | } | |
954 | btrfs_mark_buffer_dirty(leaf); | |
955 | return 0; | |
956 | } | |
957 | #endif | |
958 | ||
959 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
960 | { | |
961 | u32 high_crc = ~(u32)0; | |
962 | u32 low_crc = ~(u32)0; | |
963 | __le64 lenum; | |
964 | ||
965 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 966 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 967 | lenum = cpu_to_le64(owner); |
163e783e | 968 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 969 | lenum = cpu_to_le64(offset); |
163e783e | 970 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
971 | |
972 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
973 | } | |
974 | ||
975 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
976 | struct btrfs_extent_data_ref *ref) | |
977 | { | |
978 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
979 | btrfs_extent_data_ref_objectid(leaf, ref), | |
980 | btrfs_extent_data_ref_offset(leaf, ref)); | |
981 | } | |
982 | ||
983 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
984 | struct btrfs_extent_data_ref *ref, | |
985 | u64 root_objectid, u64 owner, u64 offset) | |
986 | { | |
987 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
988 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
989 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
990 | return 0; | |
991 | return 1; | |
992 | } | |
993 | ||
994 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
995 | struct btrfs_root *root, | |
996 | struct btrfs_path *path, | |
997 | u64 bytenr, u64 parent, | |
998 | u64 root_objectid, | |
999 | u64 owner, u64 offset) | |
1000 | { | |
1001 | struct btrfs_key key; | |
1002 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1003 | struct extent_buffer *leaf; |
5d4f98a2 | 1004 | u32 nritems; |
74493f7a | 1005 | int ret; |
5d4f98a2 YZ |
1006 | int recow; |
1007 | int err = -ENOENT; | |
74493f7a | 1008 | |
31840ae1 | 1009 | key.objectid = bytenr; |
5d4f98a2 YZ |
1010 | if (parent) { |
1011 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1012 | key.offset = parent; | |
1013 | } else { | |
1014 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1015 | key.offset = hash_extent_data_ref(root_objectid, | |
1016 | owner, offset); | |
1017 | } | |
1018 | again: | |
1019 | recow = 0; | |
1020 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1021 | if (ret < 0) { | |
1022 | err = ret; | |
1023 | goto fail; | |
1024 | } | |
31840ae1 | 1025 | |
5d4f98a2 YZ |
1026 | if (parent) { |
1027 | if (!ret) | |
1028 | return 0; | |
1029 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1030 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1031 | btrfs_release_path(root, path); | |
1032 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1033 | if (ret < 0) { | |
1034 | err = ret; | |
1035 | goto fail; | |
1036 | } | |
1037 | if (!ret) | |
1038 | return 0; | |
1039 | #endif | |
1040 | goto fail; | |
31840ae1 ZY |
1041 | } |
1042 | ||
1043 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1044 | nritems = btrfs_header_nritems(leaf); |
1045 | while (1) { | |
1046 | if (path->slots[0] >= nritems) { | |
1047 | ret = btrfs_next_leaf(root, path); | |
1048 | if (ret < 0) | |
1049 | err = ret; | |
1050 | if (ret) | |
1051 | goto fail; | |
1052 | ||
1053 | leaf = path->nodes[0]; | |
1054 | nritems = btrfs_header_nritems(leaf); | |
1055 | recow = 1; | |
1056 | } | |
1057 | ||
1058 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1059 | if (key.objectid != bytenr || | |
1060 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1061 | goto fail; | |
1062 | ||
1063 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1064 | struct btrfs_extent_data_ref); | |
1065 | ||
1066 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1067 | owner, offset)) { | |
1068 | if (recow) { | |
1069 | btrfs_release_path(root, path); | |
1070 | goto again; | |
1071 | } | |
1072 | err = 0; | |
1073 | break; | |
1074 | } | |
1075 | path->slots[0]++; | |
31840ae1 | 1076 | } |
5d4f98a2 YZ |
1077 | fail: |
1078 | return err; | |
31840ae1 ZY |
1079 | } |
1080 | ||
5d4f98a2 YZ |
1081 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1082 | struct btrfs_root *root, | |
1083 | struct btrfs_path *path, | |
1084 | u64 bytenr, u64 parent, | |
1085 | u64 root_objectid, u64 owner, | |
1086 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1087 | { |
1088 | struct btrfs_key key; | |
1089 | struct extent_buffer *leaf; | |
5d4f98a2 | 1090 | u32 size; |
31840ae1 ZY |
1091 | u32 num_refs; |
1092 | int ret; | |
74493f7a | 1093 | |
74493f7a | 1094 | key.objectid = bytenr; |
5d4f98a2 YZ |
1095 | if (parent) { |
1096 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1097 | key.offset = parent; | |
1098 | size = sizeof(struct btrfs_shared_data_ref); | |
1099 | } else { | |
1100 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1101 | key.offset = hash_extent_data_ref(root_objectid, | |
1102 | owner, offset); | |
1103 | size = sizeof(struct btrfs_extent_data_ref); | |
1104 | } | |
74493f7a | 1105 | |
5d4f98a2 YZ |
1106 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1107 | if (ret && ret != -EEXIST) | |
1108 | goto fail; | |
1109 | ||
1110 | leaf = path->nodes[0]; | |
1111 | if (parent) { | |
1112 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1113 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1114 | struct btrfs_shared_data_ref); |
1115 | if (ret == 0) { | |
1116 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1117 | } else { | |
1118 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1119 | num_refs += refs_to_add; | |
1120 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1121 | } |
5d4f98a2 YZ |
1122 | } else { |
1123 | struct btrfs_extent_data_ref *ref; | |
1124 | while (ret == -EEXIST) { | |
1125 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1126 | struct btrfs_extent_data_ref); | |
1127 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1128 | owner, offset)) | |
1129 | break; | |
1130 | btrfs_release_path(root, path); | |
1131 | key.offset++; | |
1132 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1133 | size); | |
1134 | if (ret && ret != -EEXIST) | |
1135 | goto fail; | |
31840ae1 | 1136 | |
5d4f98a2 YZ |
1137 | leaf = path->nodes[0]; |
1138 | } | |
1139 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1140 | struct btrfs_extent_data_ref); | |
1141 | if (ret == 0) { | |
1142 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1143 | root_objectid); | |
1144 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1145 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1146 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1147 | } else { | |
1148 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1149 | num_refs += refs_to_add; | |
1150 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1151 | } |
31840ae1 | 1152 | } |
5d4f98a2 YZ |
1153 | btrfs_mark_buffer_dirty(leaf); |
1154 | ret = 0; | |
1155 | fail: | |
7bb86316 CM |
1156 | btrfs_release_path(root, path); |
1157 | return ret; | |
74493f7a CM |
1158 | } |
1159 | ||
5d4f98a2 YZ |
1160 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1161 | struct btrfs_root *root, | |
1162 | struct btrfs_path *path, | |
1163 | int refs_to_drop) | |
31840ae1 | 1164 | { |
5d4f98a2 YZ |
1165 | struct btrfs_key key; |
1166 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1167 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1168 | struct extent_buffer *leaf; |
5d4f98a2 | 1169 | u32 num_refs = 0; |
31840ae1 ZY |
1170 | int ret = 0; |
1171 | ||
1172 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1173 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1174 | ||
1175 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1176 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1177 | struct btrfs_extent_data_ref); | |
1178 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1179 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1180 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1181 | struct btrfs_shared_data_ref); | |
1182 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1183 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1184 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1185 | struct btrfs_extent_ref_v0 *ref0; | |
1186 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1187 | struct btrfs_extent_ref_v0); | |
1188 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1189 | #endif | |
1190 | } else { | |
1191 | BUG(); | |
1192 | } | |
1193 | ||
56bec294 CM |
1194 | BUG_ON(num_refs < refs_to_drop); |
1195 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1196 | |
31840ae1 ZY |
1197 | if (num_refs == 0) { |
1198 | ret = btrfs_del_item(trans, root, path); | |
1199 | } else { | |
5d4f98a2 YZ |
1200 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1201 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1202 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1203 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1204 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1205 | else { | |
1206 | struct btrfs_extent_ref_v0 *ref0; | |
1207 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1208 | struct btrfs_extent_ref_v0); | |
1209 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1210 | } | |
1211 | #endif | |
31840ae1 ZY |
1212 | btrfs_mark_buffer_dirty(leaf); |
1213 | } | |
31840ae1 ZY |
1214 | return ret; |
1215 | } | |
1216 | ||
5d4f98a2 YZ |
1217 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1218 | struct btrfs_path *path, | |
1219 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1220 | { |
5d4f98a2 YZ |
1221 | struct btrfs_key key; |
1222 | struct extent_buffer *leaf; | |
1223 | struct btrfs_extent_data_ref *ref1; | |
1224 | struct btrfs_shared_data_ref *ref2; | |
1225 | u32 num_refs = 0; | |
1226 | ||
1227 | leaf = path->nodes[0]; | |
1228 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1229 | if (iref) { | |
1230 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1231 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1232 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1233 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1234 | } else { | |
1235 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1236 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1237 | } | |
1238 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1239 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1240 | struct btrfs_extent_data_ref); | |
1241 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1242 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1243 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1244 | struct btrfs_shared_data_ref); | |
1245 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1246 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1247 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1248 | struct btrfs_extent_ref_v0 *ref0; | |
1249 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1250 | struct btrfs_extent_ref_v0); | |
1251 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1252 | #endif |
5d4f98a2 YZ |
1253 | } else { |
1254 | WARN_ON(1); | |
1255 | } | |
1256 | return num_refs; | |
1257 | } | |
15916de8 | 1258 | |
5d4f98a2 YZ |
1259 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1260 | struct btrfs_root *root, | |
1261 | struct btrfs_path *path, | |
1262 | u64 bytenr, u64 parent, | |
1263 | u64 root_objectid) | |
1f3c79a2 | 1264 | { |
5d4f98a2 | 1265 | struct btrfs_key key; |
1f3c79a2 | 1266 | int ret; |
1f3c79a2 | 1267 | |
5d4f98a2 YZ |
1268 | key.objectid = bytenr; |
1269 | if (parent) { | |
1270 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1271 | key.offset = parent; | |
1272 | } else { | |
1273 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1274 | key.offset = root_objectid; | |
1f3c79a2 LH |
1275 | } |
1276 | ||
5d4f98a2 YZ |
1277 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1278 | if (ret > 0) | |
1279 | ret = -ENOENT; | |
1280 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1281 | if (ret == -ENOENT && parent) { | |
1282 | btrfs_release_path(root, path); | |
1283 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1284 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1285 | if (ret > 0) | |
1286 | ret = -ENOENT; | |
1287 | } | |
1f3c79a2 | 1288 | #endif |
5d4f98a2 | 1289 | return ret; |
1f3c79a2 LH |
1290 | } |
1291 | ||
5d4f98a2 YZ |
1292 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1293 | struct btrfs_root *root, | |
1294 | struct btrfs_path *path, | |
1295 | u64 bytenr, u64 parent, | |
1296 | u64 root_objectid) | |
31840ae1 | 1297 | { |
5d4f98a2 | 1298 | struct btrfs_key key; |
31840ae1 | 1299 | int ret; |
31840ae1 | 1300 | |
5d4f98a2 YZ |
1301 | key.objectid = bytenr; |
1302 | if (parent) { | |
1303 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1304 | key.offset = parent; | |
1305 | } else { | |
1306 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1307 | key.offset = root_objectid; | |
1308 | } | |
1309 | ||
1310 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1311 | btrfs_release_path(root, path); | |
31840ae1 ZY |
1312 | return ret; |
1313 | } | |
1314 | ||
5d4f98a2 | 1315 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1316 | { |
5d4f98a2 YZ |
1317 | int type; |
1318 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1319 | if (parent > 0) | |
1320 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1321 | else | |
1322 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1323 | } else { | |
1324 | if (parent > 0) | |
1325 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1326 | else | |
1327 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1328 | } | |
1329 | return type; | |
31840ae1 | 1330 | } |
56bec294 | 1331 | |
2c47e605 YZ |
1332 | static int find_next_key(struct btrfs_path *path, int level, |
1333 | struct btrfs_key *key) | |
56bec294 | 1334 | |
02217ed2 | 1335 | { |
2c47e605 | 1336 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1337 | if (!path->nodes[level]) |
1338 | break; | |
5d4f98a2 YZ |
1339 | if (path->slots[level] + 1 >= |
1340 | btrfs_header_nritems(path->nodes[level])) | |
1341 | continue; | |
1342 | if (level == 0) | |
1343 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1344 | path->slots[level] + 1); | |
1345 | else | |
1346 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1347 | path->slots[level] + 1); | |
1348 | return 0; | |
1349 | } | |
1350 | return 1; | |
1351 | } | |
037e6390 | 1352 | |
5d4f98a2 YZ |
1353 | /* |
1354 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1355 | * to the address of inline back ref, and 0 is returned. | |
1356 | * | |
1357 | * if back ref isn't found, *ref_ret is set to the address where it | |
1358 | * should be inserted, and -ENOENT is returned. | |
1359 | * | |
1360 | * if insert is true and there are too many inline back refs, the path | |
1361 | * points to the extent item, and -EAGAIN is returned. | |
1362 | * | |
1363 | * NOTE: inline back refs are ordered in the same way that back ref | |
1364 | * items in the tree are ordered. | |
1365 | */ | |
1366 | static noinline_for_stack | |
1367 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1368 | struct btrfs_root *root, | |
1369 | struct btrfs_path *path, | |
1370 | struct btrfs_extent_inline_ref **ref_ret, | |
1371 | u64 bytenr, u64 num_bytes, | |
1372 | u64 parent, u64 root_objectid, | |
1373 | u64 owner, u64 offset, int insert) | |
1374 | { | |
1375 | struct btrfs_key key; | |
1376 | struct extent_buffer *leaf; | |
1377 | struct btrfs_extent_item *ei; | |
1378 | struct btrfs_extent_inline_ref *iref; | |
1379 | u64 flags; | |
1380 | u64 item_size; | |
1381 | unsigned long ptr; | |
1382 | unsigned long end; | |
1383 | int extra_size; | |
1384 | int type; | |
1385 | int want; | |
1386 | int ret; | |
1387 | int err = 0; | |
26b8003f | 1388 | |
db94535d | 1389 | key.objectid = bytenr; |
31840ae1 | 1390 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1391 | key.offset = num_bytes; |
31840ae1 | 1392 | |
5d4f98a2 YZ |
1393 | want = extent_ref_type(parent, owner); |
1394 | if (insert) { | |
1395 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1396 | path->keep_locks = 1; |
5d4f98a2 YZ |
1397 | } else |
1398 | extra_size = -1; | |
1399 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1400 | if (ret < 0) { |
5d4f98a2 YZ |
1401 | err = ret; |
1402 | goto out; | |
1403 | } | |
1404 | BUG_ON(ret); | |
1405 | ||
1406 | leaf = path->nodes[0]; | |
1407 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1408 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1409 | if (item_size < sizeof(*ei)) { | |
1410 | if (!insert) { | |
1411 | err = -ENOENT; | |
1412 | goto out; | |
1413 | } | |
1414 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1415 | extra_size); | |
1416 | if (ret < 0) { | |
1417 | err = ret; | |
1418 | goto out; | |
1419 | } | |
1420 | leaf = path->nodes[0]; | |
1421 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1422 | } | |
1423 | #endif | |
1424 | BUG_ON(item_size < sizeof(*ei)); | |
1425 | ||
5d4f98a2 YZ |
1426 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1427 | flags = btrfs_extent_flags(leaf, ei); | |
1428 | ||
1429 | ptr = (unsigned long)(ei + 1); | |
1430 | end = (unsigned long)ei + item_size; | |
1431 | ||
1432 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1433 | ptr += sizeof(struct btrfs_tree_block_info); | |
1434 | BUG_ON(ptr > end); | |
1435 | } else { | |
1436 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1437 | } | |
1438 | ||
1439 | err = -ENOENT; | |
1440 | while (1) { | |
1441 | if (ptr >= end) { | |
1442 | WARN_ON(ptr > end); | |
1443 | break; | |
1444 | } | |
1445 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1446 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1447 | if (want < type) | |
1448 | break; | |
1449 | if (want > type) { | |
1450 | ptr += btrfs_extent_inline_ref_size(type); | |
1451 | continue; | |
1452 | } | |
1453 | ||
1454 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1455 | struct btrfs_extent_data_ref *dref; | |
1456 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1457 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1458 | owner, offset)) { | |
1459 | err = 0; | |
1460 | break; | |
1461 | } | |
1462 | if (hash_extent_data_ref_item(leaf, dref) < | |
1463 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1464 | break; | |
1465 | } else { | |
1466 | u64 ref_offset; | |
1467 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1468 | if (parent > 0) { | |
1469 | if (parent == ref_offset) { | |
1470 | err = 0; | |
1471 | break; | |
1472 | } | |
1473 | if (ref_offset < parent) | |
1474 | break; | |
1475 | } else { | |
1476 | if (root_objectid == ref_offset) { | |
1477 | err = 0; | |
1478 | break; | |
1479 | } | |
1480 | if (ref_offset < root_objectid) | |
1481 | break; | |
1482 | } | |
1483 | } | |
1484 | ptr += btrfs_extent_inline_ref_size(type); | |
1485 | } | |
1486 | if (err == -ENOENT && insert) { | |
1487 | if (item_size + extra_size >= | |
1488 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1489 | err = -EAGAIN; | |
1490 | goto out; | |
1491 | } | |
1492 | /* | |
1493 | * To add new inline back ref, we have to make sure | |
1494 | * there is no corresponding back ref item. | |
1495 | * For simplicity, we just do not add new inline back | |
1496 | * ref if there is any kind of item for this block | |
1497 | */ | |
2c47e605 YZ |
1498 | if (find_next_key(path, 0, &key) == 0 && |
1499 | key.objectid == bytenr && | |
85d4198e | 1500 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1501 | err = -EAGAIN; |
1502 | goto out; | |
1503 | } | |
1504 | } | |
1505 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1506 | out: | |
85d4198e | 1507 | if (insert) { |
5d4f98a2 YZ |
1508 | path->keep_locks = 0; |
1509 | btrfs_unlock_up_safe(path, 1); | |
1510 | } | |
1511 | return err; | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * helper to add new inline back ref | |
1516 | */ | |
1517 | static noinline_for_stack | |
1518 | int setup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1519 | struct btrfs_root *root, | |
1520 | struct btrfs_path *path, | |
1521 | struct btrfs_extent_inline_ref *iref, | |
1522 | u64 parent, u64 root_objectid, | |
1523 | u64 owner, u64 offset, int refs_to_add, | |
1524 | struct btrfs_delayed_extent_op *extent_op) | |
1525 | { | |
1526 | struct extent_buffer *leaf; | |
1527 | struct btrfs_extent_item *ei; | |
1528 | unsigned long ptr; | |
1529 | unsigned long end; | |
1530 | unsigned long item_offset; | |
1531 | u64 refs; | |
1532 | int size; | |
1533 | int type; | |
1534 | int ret; | |
1535 | ||
1536 | leaf = path->nodes[0]; | |
1537 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1538 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1539 | ||
1540 | type = extent_ref_type(parent, owner); | |
1541 | size = btrfs_extent_inline_ref_size(type); | |
1542 | ||
1543 | ret = btrfs_extend_item(trans, root, path, size); | |
1544 | BUG_ON(ret); | |
1545 | ||
1546 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1547 | refs = btrfs_extent_refs(leaf, ei); | |
1548 | refs += refs_to_add; | |
1549 | btrfs_set_extent_refs(leaf, ei, refs); | |
1550 | if (extent_op) | |
1551 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1552 | ||
1553 | ptr = (unsigned long)ei + item_offset; | |
1554 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1555 | if (ptr < end - size) | |
1556 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1557 | end - size - ptr); | |
1558 | ||
1559 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1560 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1561 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1562 | struct btrfs_extent_data_ref *dref; | |
1563 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1564 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1565 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1566 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1567 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1568 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1569 | struct btrfs_shared_data_ref *sref; | |
1570 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1571 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1572 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1573 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1574 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1575 | } else { | |
1576 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1577 | } | |
1578 | btrfs_mark_buffer_dirty(leaf); | |
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1583 | struct btrfs_root *root, | |
1584 | struct btrfs_path *path, | |
1585 | struct btrfs_extent_inline_ref **ref_ret, | |
1586 | u64 bytenr, u64 num_bytes, u64 parent, | |
1587 | u64 root_objectid, u64 owner, u64 offset) | |
1588 | { | |
1589 | int ret; | |
1590 | ||
1591 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1592 | bytenr, num_bytes, parent, | |
1593 | root_objectid, owner, offset, 0); | |
1594 | if (ret != -ENOENT) | |
54aa1f4d | 1595 | return ret; |
5d4f98a2 YZ |
1596 | |
1597 | btrfs_release_path(root, path); | |
1598 | *ref_ret = NULL; | |
1599 | ||
1600 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1601 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1602 | root_objectid); | |
1603 | } else { | |
1604 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1605 | root_objectid, owner, offset); | |
b9473439 | 1606 | } |
5d4f98a2 YZ |
1607 | return ret; |
1608 | } | |
31840ae1 | 1609 | |
5d4f98a2 YZ |
1610 | /* |
1611 | * helper to update/remove inline back ref | |
1612 | */ | |
1613 | static noinline_for_stack | |
1614 | int update_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1615 | struct btrfs_root *root, | |
1616 | struct btrfs_path *path, | |
1617 | struct btrfs_extent_inline_ref *iref, | |
1618 | int refs_to_mod, | |
1619 | struct btrfs_delayed_extent_op *extent_op) | |
1620 | { | |
1621 | struct extent_buffer *leaf; | |
1622 | struct btrfs_extent_item *ei; | |
1623 | struct btrfs_extent_data_ref *dref = NULL; | |
1624 | struct btrfs_shared_data_ref *sref = NULL; | |
1625 | unsigned long ptr; | |
1626 | unsigned long end; | |
1627 | u32 item_size; | |
1628 | int size; | |
1629 | int type; | |
1630 | int ret; | |
1631 | u64 refs; | |
1632 | ||
1633 | leaf = path->nodes[0]; | |
1634 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1635 | refs = btrfs_extent_refs(leaf, ei); | |
1636 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1637 | refs += refs_to_mod; | |
1638 | btrfs_set_extent_refs(leaf, ei, refs); | |
1639 | if (extent_op) | |
1640 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1641 | ||
1642 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1643 | ||
1644 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1645 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1646 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1647 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1648 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1649 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1650 | } else { | |
1651 | refs = 1; | |
1652 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1653 | } |
31840ae1 | 1654 | |
5d4f98a2 YZ |
1655 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1656 | refs += refs_to_mod; | |
1657 | ||
1658 | if (refs > 0) { | |
1659 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1660 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1661 | else | |
1662 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1663 | } else { | |
1664 | size = btrfs_extent_inline_ref_size(type); | |
1665 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1666 | ptr = (unsigned long)iref; | |
1667 | end = (unsigned long)ei + item_size; | |
1668 | if (ptr + size < end) | |
1669 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1670 | end - ptr - size); | |
1671 | item_size -= size; | |
1672 | ret = btrfs_truncate_item(trans, root, path, item_size, 1); | |
1673 | BUG_ON(ret); | |
1674 | } | |
1675 | btrfs_mark_buffer_dirty(leaf); | |
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | static noinline_for_stack | |
1680 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1681 | struct btrfs_root *root, | |
1682 | struct btrfs_path *path, | |
1683 | u64 bytenr, u64 num_bytes, u64 parent, | |
1684 | u64 root_objectid, u64 owner, | |
1685 | u64 offset, int refs_to_add, | |
1686 | struct btrfs_delayed_extent_op *extent_op) | |
1687 | { | |
1688 | struct btrfs_extent_inline_ref *iref; | |
1689 | int ret; | |
1690 | ||
1691 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1692 | bytenr, num_bytes, parent, | |
1693 | root_objectid, owner, offset, 1); | |
1694 | if (ret == 0) { | |
1695 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1696 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1697 | refs_to_add, extent_op); | |
1698 | } else if (ret == -ENOENT) { | |
1699 | ret = setup_inline_extent_backref(trans, root, path, iref, | |
1700 | parent, root_objectid, | |
1701 | owner, offset, refs_to_add, | |
1702 | extent_op); | |
771ed689 | 1703 | } |
5d4f98a2 YZ |
1704 | return ret; |
1705 | } | |
31840ae1 | 1706 | |
5d4f98a2 YZ |
1707 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1708 | struct btrfs_root *root, | |
1709 | struct btrfs_path *path, | |
1710 | u64 bytenr, u64 parent, u64 root_objectid, | |
1711 | u64 owner, u64 offset, int refs_to_add) | |
1712 | { | |
1713 | int ret; | |
1714 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1715 | BUG_ON(refs_to_add != 1); | |
1716 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1717 | parent, root_objectid); | |
1718 | } else { | |
1719 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1720 | parent, root_objectid, | |
1721 | owner, offset, refs_to_add); | |
1722 | } | |
1723 | return ret; | |
1724 | } | |
56bec294 | 1725 | |
5d4f98a2 YZ |
1726 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1727 | struct btrfs_root *root, | |
1728 | struct btrfs_path *path, | |
1729 | struct btrfs_extent_inline_ref *iref, | |
1730 | int refs_to_drop, int is_data) | |
1731 | { | |
1732 | int ret; | |
b9473439 | 1733 | |
5d4f98a2 YZ |
1734 | BUG_ON(!is_data && refs_to_drop != 1); |
1735 | if (iref) { | |
1736 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1737 | -refs_to_drop, NULL); | |
1738 | } else if (is_data) { | |
1739 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1740 | } else { | |
1741 | ret = btrfs_del_item(trans, root, path); | |
1742 | } | |
1743 | return ret; | |
1744 | } | |
1745 | ||
5d4f98a2 YZ |
1746 | static void btrfs_issue_discard(struct block_device *bdev, |
1747 | u64 start, u64 len) | |
1748 | { | |
746cd1e7 | 1749 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL, |
fbd9b09a | 1750 | BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); |
5d4f98a2 | 1751 | } |
5d4f98a2 YZ |
1752 | |
1753 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
1754 | u64 num_bytes) | |
1755 | { | |
5d4f98a2 YZ |
1756 | int ret; |
1757 | u64 map_length = num_bytes; | |
1758 | struct btrfs_multi_bio *multi = NULL; | |
1759 | ||
e244a0ae CH |
1760 | if (!btrfs_test_opt(root, DISCARD)) |
1761 | return 0; | |
1762 | ||
5d4f98a2 YZ |
1763 | /* Tell the block device(s) that the sectors can be discarded */ |
1764 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
1765 | bytenr, &map_length, &multi, 0); | |
1766 | if (!ret) { | |
1767 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
1768 | int i; | |
1769 | ||
1770 | if (map_length > num_bytes) | |
1771 | map_length = num_bytes; | |
1772 | ||
1773 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
1774 | btrfs_issue_discard(stripe->dev->bdev, | |
1775 | stripe->physical, | |
1776 | map_length); | |
1777 | } | |
1778 | kfree(multi); | |
1779 | } | |
1780 | ||
1781 | return ret; | |
5d4f98a2 YZ |
1782 | } |
1783 | ||
1784 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1785 | struct btrfs_root *root, | |
1786 | u64 bytenr, u64 num_bytes, u64 parent, | |
1787 | u64 root_objectid, u64 owner, u64 offset) | |
1788 | { | |
1789 | int ret; | |
1790 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1791 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1792 | ||
1793 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1794 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
1795 | parent, root_objectid, (int)owner, | |
1796 | BTRFS_ADD_DELAYED_REF, NULL); | |
1797 | } else { | |
1798 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
1799 | parent, root_objectid, owner, offset, | |
1800 | BTRFS_ADD_DELAYED_REF, NULL); | |
1801 | } | |
1802 | return ret; | |
1803 | } | |
1804 | ||
1805 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1806 | struct btrfs_root *root, | |
1807 | u64 bytenr, u64 num_bytes, | |
1808 | u64 parent, u64 root_objectid, | |
1809 | u64 owner, u64 offset, int refs_to_add, | |
1810 | struct btrfs_delayed_extent_op *extent_op) | |
1811 | { | |
1812 | struct btrfs_path *path; | |
1813 | struct extent_buffer *leaf; | |
1814 | struct btrfs_extent_item *item; | |
1815 | u64 refs; | |
1816 | int ret; | |
1817 | int err = 0; | |
1818 | ||
1819 | path = btrfs_alloc_path(); | |
1820 | if (!path) | |
1821 | return -ENOMEM; | |
1822 | ||
1823 | path->reada = 1; | |
1824 | path->leave_spinning = 1; | |
1825 | /* this will setup the path even if it fails to insert the back ref */ | |
1826 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1827 | path, bytenr, num_bytes, parent, | |
1828 | root_objectid, owner, offset, | |
1829 | refs_to_add, extent_op); | |
1830 | if (ret == 0) | |
1831 | goto out; | |
1832 | ||
1833 | if (ret != -EAGAIN) { | |
1834 | err = ret; | |
1835 | goto out; | |
1836 | } | |
1837 | ||
1838 | leaf = path->nodes[0]; | |
1839 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1840 | refs = btrfs_extent_refs(leaf, item); | |
1841 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1842 | if (extent_op) | |
1843 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1844 | |
5d4f98a2 | 1845 | btrfs_mark_buffer_dirty(leaf); |
56bec294 CM |
1846 | btrfs_release_path(root->fs_info->extent_root, path); |
1847 | ||
1848 | path->reada = 1; | |
b9473439 CM |
1849 | path->leave_spinning = 1; |
1850 | ||
56bec294 CM |
1851 | /* now insert the actual backref */ |
1852 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1853 | path, bytenr, parent, root_objectid, |
1854 | owner, offset, refs_to_add); | |
56bec294 | 1855 | BUG_ON(ret); |
5d4f98a2 | 1856 | out: |
56bec294 | 1857 | btrfs_free_path(path); |
5d4f98a2 | 1858 | return err; |
56bec294 CM |
1859 | } |
1860 | ||
5d4f98a2 YZ |
1861 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1862 | struct btrfs_root *root, | |
1863 | struct btrfs_delayed_ref_node *node, | |
1864 | struct btrfs_delayed_extent_op *extent_op, | |
1865 | int insert_reserved) | |
56bec294 | 1866 | { |
5d4f98a2 YZ |
1867 | int ret = 0; |
1868 | struct btrfs_delayed_data_ref *ref; | |
1869 | struct btrfs_key ins; | |
1870 | u64 parent = 0; | |
1871 | u64 ref_root = 0; | |
1872 | u64 flags = 0; | |
1873 | ||
1874 | ins.objectid = node->bytenr; | |
1875 | ins.offset = node->num_bytes; | |
1876 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1877 | ||
1878 | ref = btrfs_delayed_node_to_data_ref(node); | |
1879 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1880 | parent = ref->parent; | |
1881 | else | |
1882 | ref_root = ref->root; | |
1883 | ||
1884 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1885 | if (extent_op) { | |
1886 | BUG_ON(extent_op->update_key); | |
1887 | flags |= extent_op->flags_to_set; | |
1888 | } | |
1889 | ret = alloc_reserved_file_extent(trans, root, | |
1890 | parent, ref_root, flags, | |
1891 | ref->objectid, ref->offset, | |
1892 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1893 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1894 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1895 | node->num_bytes, parent, | |
1896 | ref_root, ref->objectid, | |
1897 | ref->offset, node->ref_mod, | |
1898 | extent_op); | |
1899 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1900 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1901 | node->num_bytes, parent, | |
1902 | ref_root, ref->objectid, | |
1903 | ref->offset, node->ref_mod, | |
1904 | extent_op); | |
1905 | } else { | |
1906 | BUG(); | |
1907 | } | |
1908 | return ret; | |
1909 | } | |
1910 | ||
1911 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
1912 | struct extent_buffer *leaf, | |
1913 | struct btrfs_extent_item *ei) | |
1914 | { | |
1915 | u64 flags = btrfs_extent_flags(leaf, ei); | |
1916 | if (extent_op->update_flags) { | |
1917 | flags |= extent_op->flags_to_set; | |
1918 | btrfs_set_extent_flags(leaf, ei, flags); | |
1919 | } | |
1920 | ||
1921 | if (extent_op->update_key) { | |
1922 | struct btrfs_tree_block_info *bi; | |
1923 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
1924 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
1925 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
1930 | struct btrfs_root *root, | |
1931 | struct btrfs_delayed_ref_node *node, | |
1932 | struct btrfs_delayed_extent_op *extent_op) | |
1933 | { | |
1934 | struct btrfs_key key; | |
1935 | struct btrfs_path *path; | |
1936 | struct btrfs_extent_item *ei; | |
1937 | struct extent_buffer *leaf; | |
1938 | u32 item_size; | |
56bec294 | 1939 | int ret; |
5d4f98a2 YZ |
1940 | int err = 0; |
1941 | ||
1942 | path = btrfs_alloc_path(); | |
1943 | if (!path) | |
1944 | return -ENOMEM; | |
1945 | ||
1946 | key.objectid = node->bytenr; | |
1947 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1948 | key.offset = node->num_bytes; | |
1949 | ||
1950 | path->reada = 1; | |
1951 | path->leave_spinning = 1; | |
1952 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
1953 | path, 0, 1); | |
1954 | if (ret < 0) { | |
1955 | err = ret; | |
1956 | goto out; | |
1957 | } | |
1958 | if (ret > 0) { | |
1959 | err = -EIO; | |
1960 | goto out; | |
1961 | } | |
1962 | ||
1963 | leaf = path->nodes[0]; | |
1964 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1965 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1966 | if (item_size < sizeof(*ei)) { | |
1967 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
1968 | path, (u64)-1, 0); | |
1969 | if (ret < 0) { | |
1970 | err = ret; | |
1971 | goto out; | |
1972 | } | |
1973 | leaf = path->nodes[0]; | |
1974 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1975 | } | |
1976 | #endif | |
1977 | BUG_ON(item_size < sizeof(*ei)); | |
1978 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1979 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 1980 | |
5d4f98a2 YZ |
1981 | btrfs_mark_buffer_dirty(leaf); |
1982 | out: | |
1983 | btrfs_free_path(path); | |
1984 | return err; | |
56bec294 CM |
1985 | } |
1986 | ||
5d4f98a2 YZ |
1987 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
1988 | struct btrfs_root *root, | |
1989 | struct btrfs_delayed_ref_node *node, | |
1990 | struct btrfs_delayed_extent_op *extent_op, | |
1991 | int insert_reserved) | |
56bec294 CM |
1992 | { |
1993 | int ret = 0; | |
5d4f98a2 YZ |
1994 | struct btrfs_delayed_tree_ref *ref; |
1995 | struct btrfs_key ins; | |
1996 | u64 parent = 0; | |
1997 | u64 ref_root = 0; | |
56bec294 | 1998 | |
5d4f98a2 YZ |
1999 | ins.objectid = node->bytenr; |
2000 | ins.offset = node->num_bytes; | |
2001 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 2002 | |
5d4f98a2 YZ |
2003 | ref = btrfs_delayed_node_to_tree_ref(node); |
2004 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2005 | parent = ref->parent; | |
2006 | else | |
2007 | ref_root = ref->root; | |
2008 | ||
2009 | BUG_ON(node->ref_mod != 1); | |
2010 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2011 | BUG_ON(!extent_op || !extent_op->update_flags || | |
2012 | !extent_op->update_key); | |
2013 | ret = alloc_reserved_tree_block(trans, root, | |
2014 | parent, ref_root, | |
2015 | extent_op->flags_to_set, | |
2016 | &extent_op->key, | |
2017 | ref->level, &ins); | |
5d4f98a2 YZ |
2018 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2019 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2020 | node->num_bytes, parent, ref_root, | |
2021 | ref->level, 0, 1, extent_op); | |
2022 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2023 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2024 | node->num_bytes, parent, ref_root, | |
2025 | ref->level, 0, 1, extent_op); | |
2026 | } else { | |
2027 | BUG(); | |
2028 | } | |
56bec294 CM |
2029 | return ret; |
2030 | } | |
2031 | ||
2032 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2033 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2034 | struct btrfs_root *root, | |
2035 | struct btrfs_delayed_ref_node *node, | |
2036 | struct btrfs_delayed_extent_op *extent_op, | |
2037 | int insert_reserved) | |
56bec294 CM |
2038 | { |
2039 | int ret; | |
5d4f98a2 | 2040 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2041 | struct btrfs_delayed_ref_head *head; |
2042 | /* | |
2043 | * we've hit the end of the chain and we were supposed | |
2044 | * to insert this extent into the tree. But, it got | |
2045 | * deleted before we ever needed to insert it, so all | |
2046 | * we have to do is clean up the accounting | |
2047 | */ | |
5d4f98a2 YZ |
2048 | BUG_ON(extent_op); |
2049 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2050 | if (insert_reserved) { |
f0486c68 YZ |
2051 | btrfs_pin_extent(root, node->bytenr, |
2052 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2053 | if (head->is_data) { |
2054 | ret = btrfs_del_csums(trans, root, | |
2055 | node->bytenr, | |
2056 | node->num_bytes); | |
2057 | BUG_ON(ret); | |
2058 | } | |
56bec294 | 2059 | } |
56bec294 CM |
2060 | mutex_unlock(&head->mutex); |
2061 | return 0; | |
2062 | } | |
2063 | ||
5d4f98a2 YZ |
2064 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2065 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2066 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2067 | insert_reserved); | |
2068 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2069 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2070 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2071 | insert_reserved); | |
2072 | else | |
2073 | BUG(); | |
2074 | return ret; | |
56bec294 CM |
2075 | } |
2076 | ||
2077 | static noinline struct btrfs_delayed_ref_node * | |
2078 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2079 | { | |
2080 | struct rb_node *node; | |
2081 | struct btrfs_delayed_ref_node *ref; | |
2082 | int action = BTRFS_ADD_DELAYED_REF; | |
2083 | again: | |
2084 | /* | |
2085 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2086 | * this prevents ref count from going down to zero when | |
2087 | * there still are pending delayed ref. | |
2088 | */ | |
2089 | node = rb_prev(&head->node.rb_node); | |
2090 | while (1) { | |
2091 | if (!node) | |
2092 | break; | |
2093 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2094 | rb_node); | |
2095 | if (ref->bytenr != head->node.bytenr) | |
2096 | break; | |
5d4f98a2 | 2097 | if (ref->action == action) |
56bec294 CM |
2098 | return ref; |
2099 | node = rb_prev(node); | |
2100 | } | |
2101 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2102 | action = BTRFS_DROP_DELAYED_REF; | |
2103 | goto again; | |
2104 | } | |
2105 | return NULL; | |
2106 | } | |
2107 | ||
c3e69d58 CM |
2108 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2109 | struct btrfs_root *root, | |
2110 | struct list_head *cluster) | |
56bec294 | 2111 | { |
56bec294 CM |
2112 | struct btrfs_delayed_ref_root *delayed_refs; |
2113 | struct btrfs_delayed_ref_node *ref; | |
2114 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2115 | struct btrfs_delayed_extent_op *extent_op; |
56bec294 | 2116 | int ret; |
c3e69d58 | 2117 | int count = 0; |
56bec294 | 2118 | int must_insert_reserved = 0; |
56bec294 CM |
2119 | |
2120 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2121 | while (1) { |
2122 | if (!locked_ref) { | |
c3e69d58 CM |
2123 | /* pick a new head ref from the cluster list */ |
2124 | if (list_empty(cluster)) | |
56bec294 | 2125 | break; |
56bec294 | 2126 | |
c3e69d58 CM |
2127 | locked_ref = list_entry(cluster->next, |
2128 | struct btrfs_delayed_ref_head, cluster); | |
2129 | ||
2130 | /* grab the lock that says we are going to process | |
2131 | * all the refs for this head */ | |
2132 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2133 | ||
2134 | /* | |
2135 | * we may have dropped the spin lock to get the head | |
2136 | * mutex lock, and that might have given someone else | |
2137 | * time to free the head. If that's true, it has been | |
2138 | * removed from our list and we can move on. | |
2139 | */ | |
2140 | if (ret == -EAGAIN) { | |
2141 | locked_ref = NULL; | |
2142 | count++; | |
2143 | continue; | |
56bec294 CM |
2144 | } |
2145 | } | |
a28ec197 | 2146 | |
56bec294 CM |
2147 | /* |
2148 | * record the must insert reserved flag before we | |
2149 | * drop the spin lock. | |
2150 | */ | |
2151 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2152 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2153 | |
5d4f98a2 YZ |
2154 | extent_op = locked_ref->extent_op; |
2155 | locked_ref->extent_op = NULL; | |
2156 | ||
56bec294 CM |
2157 | /* |
2158 | * locked_ref is the head node, so we have to go one | |
2159 | * node back for any delayed ref updates | |
2160 | */ | |
56bec294 CM |
2161 | ref = select_delayed_ref(locked_ref); |
2162 | if (!ref) { | |
2163 | /* All delayed refs have been processed, Go ahead | |
2164 | * and send the head node to run_one_delayed_ref, | |
2165 | * so that any accounting fixes can happen | |
2166 | */ | |
2167 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2168 | |
2169 | if (extent_op && must_insert_reserved) { | |
2170 | kfree(extent_op); | |
2171 | extent_op = NULL; | |
2172 | } | |
2173 | ||
2174 | if (extent_op) { | |
2175 | spin_unlock(&delayed_refs->lock); | |
2176 | ||
2177 | ret = run_delayed_extent_op(trans, root, | |
2178 | ref, extent_op); | |
2179 | BUG_ON(ret); | |
2180 | kfree(extent_op); | |
2181 | ||
2182 | cond_resched(); | |
2183 | spin_lock(&delayed_refs->lock); | |
2184 | continue; | |
2185 | } | |
2186 | ||
c3e69d58 | 2187 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
2188 | locked_ref = NULL; |
2189 | } | |
02217ed2 | 2190 | |
56bec294 CM |
2191 | ref->in_tree = 0; |
2192 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2193 | delayed_refs->num_entries--; | |
5d4f98a2 | 2194 | |
56bec294 | 2195 | spin_unlock(&delayed_refs->lock); |
925baedd | 2196 | |
5d4f98a2 | 2197 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 CM |
2198 | must_insert_reserved); |
2199 | BUG_ON(ret); | |
eb099670 | 2200 | |
5d4f98a2 YZ |
2201 | btrfs_put_delayed_ref(ref); |
2202 | kfree(extent_op); | |
c3e69d58 | 2203 | count++; |
5d4f98a2 | 2204 | |
c3e69d58 CM |
2205 | cond_resched(); |
2206 | spin_lock(&delayed_refs->lock); | |
2207 | } | |
2208 | return count; | |
2209 | } | |
2210 | ||
2211 | /* | |
2212 | * this starts processing the delayed reference count updates and | |
2213 | * extent insertions we have queued up so far. count can be | |
2214 | * 0, which means to process everything in the tree at the start | |
2215 | * of the run (but not newly added entries), or it can be some target | |
2216 | * number you'd like to process. | |
2217 | */ | |
2218 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2219 | struct btrfs_root *root, unsigned long count) | |
2220 | { | |
2221 | struct rb_node *node; | |
2222 | struct btrfs_delayed_ref_root *delayed_refs; | |
2223 | struct btrfs_delayed_ref_node *ref; | |
2224 | struct list_head cluster; | |
2225 | int ret; | |
2226 | int run_all = count == (unsigned long)-1; | |
2227 | int run_most = 0; | |
2228 | ||
2229 | if (root == root->fs_info->extent_root) | |
2230 | root = root->fs_info->tree_root; | |
2231 | ||
2232 | delayed_refs = &trans->transaction->delayed_refs; | |
2233 | INIT_LIST_HEAD(&cluster); | |
2234 | again: | |
2235 | spin_lock(&delayed_refs->lock); | |
2236 | if (count == 0) { | |
2237 | count = delayed_refs->num_entries * 2; | |
2238 | run_most = 1; | |
2239 | } | |
2240 | while (1) { | |
2241 | if (!(run_all || run_most) && | |
2242 | delayed_refs->num_heads_ready < 64) | |
2243 | break; | |
eb099670 | 2244 | |
56bec294 | 2245 | /* |
c3e69d58 CM |
2246 | * go find something we can process in the rbtree. We start at |
2247 | * the beginning of the tree, and then build a cluster | |
2248 | * of refs to process starting at the first one we are able to | |
2249 | * lock | |
56bec294 | 2250 | */ |
c3e69d58 CM |
2251 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2252 | delayed_refs->run_delayed_start); | |
2253 | if (ret) | |
56bec294 CM |
2254 | break; |
2255 | ||
c3e69d58 CM |
2256 | ret = run_clustered_refs(trans, root, &cluster); |
2257 | BUG_ON(ret < 0); | |
2258 | ||
2259 | count -= min_t(unsigned long, ret, count); | |
2260 | ||
2261 | if (count == 0) | |
2262 | break; | |
eb099670 | 2263 | } |
c3e69d58 | 2264 | |
56bec294 | 2265 | if (run_all) { |
56bec294 | 2266 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2267 | if (!node) |
56bec294 | 2268 | goto out; |
c3e69d58 | 2269 | count = (unsigned long)-1; |
e9d0b13b | 2270 | |
56bec294 CM |
2271 | while (node) { |
2272 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2273 | rb_node); | |
2274 | if (btrfs_delayed_ref_is_head(ref)) { | |
2275 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2276 | |
56bec294 CM |
2277 | head = btrfs_delayed_node_to_head(ref); |
2278 | atomic_inc(&ref->refs); | |
2279 | ||
2280 | spin_unlock(&delayed_refs->lock); | |
2281 | mutex_lock(&head->mutex); | |
2282 | mutex_unlock(&head->mutex); | |
2283 | ||
2284 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2285 | cond_resched(); |
56bec294 CM |
2286 | goto again; |
2287 | } | |
2288 | node = rb_next(node); | |
2289 | } | |
2290 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2291 | schedule_timeout(1); |
2292 | goto again; | |
5f39d397 | 2293 | } |
54aa1f4d | 2294 | out: |
c3e69d58 | 2295 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
2296 | return 0; |
2297 | } | |
2298 | ||
5d4f98a2 YZ |
2299 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2300 | struct btrfs_root *root, | |
2301 | u64 bytenr, u64 num_bytes, u64 flags, | |
2302 | int is_data) | |
2303 | { | |
2304 | struct btrfs_delayed_extent_op *extent_op; | |
2305 | int ret; | |
2306 | ||
2307 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2308 | if (!extent_op) | |
2309 | return -ENOMEM; | |
2310 | ||
2311 | extent_op->flags_to_set = flags; | |
2312 | extent_op->update_flags = 1; | |
2313 | extent_op->update_key = 0; | |
2314 | extent_op->is_data = is_data ? 1 : 0; | |
2315 | ||
2316 | ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); | |
2317 | if (ret) | |
2318 | kfree(extent_op); | |
2319 | return ret; | |
2320 | } | |
2321 | ||
2322 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2323 | struct btrfs_root *root, | |
2324 | struct btrfs_path *path, | |
2325 | u64 objectid, u64 offset, u64 bytenr) | |
2326 | { | |
2327 | struct btrfs_delayed_ref_head *head; | |
2328 | struct btrfs_delayed_ref_node *ref; | |
2329 | struct btrfs_delayed_data_ref *data_ref; | |
2330 | struct btrfs_delayed_ref_root *delayed_refs; | |
2331 | struct rb_node *node; | |
2332 | int ret = 0; | |
2333 | ||
2334 | ret = -ENOENT; | |
2335 | delayed_refs = &trans->transaction->delayed_refs; | |
2336 | spin_lock(&delayed_refs->lock); | |
2337 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2338 | if (!head) | |
2339 | goto out; | |
2340 | ||
2341 | if (!mutex_trylock(&head->mutex)) { | |
2342 | atomic_inc(&head->node.refs); | |
2343 | spin_unlock(&delayed_refs->lock); | |
2344 | ||
2345 | btrfs_release_path(root->fs_info->extent_root, path); | |
2346 | ||
2347 | mutex_lock(&head->mutex); | |
2348 | mutex_unlock(&head->mutex); | |
2349 | btrfs_put_delayed_ref(&head->node); | |
2350 | return -EAGAIN; | |
2351 | } | |
2352 | ||
2353 | node = rb_prev(&head->node.rb_node); | |
2354 | if (!node) | |
2355 | goto out_unlock; | |
2356 | ||
2357 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2358 | ||
2359 | if (ref->bytenr != bytenr) | |
2360 | goto out_unlock; | |
2361 | ||
2362 | ret = 1; | |
2363 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2364 | goto out_unlock; | |
2365 | ||
2366 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2367 | ||
2368 | node = rb_prev(node); | |
2369 | if (node) { | |
2370 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2371 | if (ref->bytenr == bytenr) | |
2372 | goto out_unlock; | |
2373 | } | |
2374 | ||
2375 | if (data_ref->root != root->root_key.objectid || | |
2376 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2377 | goto out_unlock; | |
2378 | ||
2379 | ret = 0; | |
2380 | out_unlock: | |
2381 | mutex_unlock(&head->mutex); | |
2382 | out: | |
2383 | spin_unlock(&delayed_refs->lock); | |
2384 | return ret; | |
2385 | } | |
2386 | ||
2387 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2388 | struct btrfs_root *root, | |
2389 | struct btrfs_path *path, | |
2390 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2391 | { |
2392 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2393 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2394 | struct btrfs_extent_data_ref *ref; |
2395 | struct btrfs_extent_inline_ref *iref; | |
2396 | struct btrfs_extent_item *ei; | |
f321e491 | 2397 | struct btrfs_key key; |
5d4f98a2 | 2398 | u32 item_size; |
be20aa9d | 2399 | int ret; |
925baedd | 2400 | |
be20aa9d | 2401 | key.objectid = bytenr; |
31840ae1 | 2402 | key.offset = (u64)-1; |
f321e491 | 2403 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2404 | |
be20aa9d CM |
2405 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2406 | if (ret < 0) | |
2407 | goto out; | |
2408 | BUG_ON(ret == 0); | |
80ff3856 YZ |
2409 | |
2410 | ret = -ENOENT; | |
2411 | if (path->slots[0] == 0) | |
31840ae1 | 2412 | goto out; |
be20aa9d | 2413 | |
31840ae1 | 2414 | path->slots[0]--; |
f321e491 | 2415 | leaf = path->nodes[0]; |
5d4f98a2 | 2416 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2417 | |
5d4f98a2 | 2418 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2419 | goto out; |
f321e491 | 2420 | |
5d4f98a2 YZ |
2421 | ret = 1; |
2422 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2423 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2424 | if (item_size < sizeof(*ei)) { | |
2425 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2426 | goto out; | |
2427 | } | |
2428 | #endif | |
2429 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2430 | |
5d4f98a2 YZ |
2431 | if (item_size != sizeof(*ei) + |
2432 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2433 | goto out; | |
be20aa9d | 2434 | |
5d4f98a2 YZ |
2435 | if (btrfs_extent_generation(leaf, ei) <= |
2436 | btrfs_root_last_snapshot(&root->root_item)) | |
2437 | goto out; | |
2438 | ||
2439 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2440 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2441 | BTRFS_EXTENT_DATA_REF_KEY) | |
2442 | goto out; | |
2443 | ||
2444 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2445 | if (btrfs_extent_refs(leaf, ei) != | |
2446 | btrfs_extent_data_ref_count(leaf, ref) || | |
2447 | btrfs_extent_data_ref_root(leaf, ref) != | |
2448 | root->root_key.objectid || | |
2449 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2450 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2451 | goto out; | |
2452 | ||
2453 | ret = 0; | |
2454 | out: | |
2455 | return ret; | |
2456 | } | |
2457 | ||
2458 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2459 | struct btrfs_root *root, | |
2460 | u64 objectid, u64 offset, u64 bytenr) | |
2461 | { | |
2462 | struct btrfs_path *path; | |
2463 | int ret; | |
2464 | int ret2; | |
2465 | ||
2466 | path = btrfs_alloc_path(); | |
2467 | if (!path) | |
2468 | return -ENOENT; | |
2469 | ||
2470 | do { | |
2471 | ret = check_committed_ref(trans, root, path, objectid, | |
2472 | offset, bytenr); | |
2473 | if (ret && ret != -ENOENT) | |
f321e491 | 2474 | goto out; |
80ff3856 | 2475 | |
5d4f98a2 YZ |
2476 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2477 | offset, bytenr); | |
2478 | } while (ret2 == -EAGAIN); | |
2479 | ||
2480 | if (ret2 && ret2 != -ENOENT) { | |
2481 | ret = ret2; | |
2482 | goto out; | |
f321e491 | 2483 | } |
5d4f98a2 YZ |
2484 | |
2485 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2486 | ret = 0; | |
be20aa9d | 2487 | out: |
80ff3856 | 2488 | btrfs_free_path(path); |
f0486c68 YZ |
2489 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2490 | WARN_ON(ret > 0); | |
f321e491 | 2491 | return ret; |
be20aa9d | 2492 | } |
c5739bba | 2493 | |
5d4f98a2 | 2494 | #if 0 |
31840ae1 ZY |
2495 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
2496 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 2497 | { |
5f39d397 | 2498 | struct btrfs_key key; |
6407bf6d | 2499 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
2500 | u64 root_gen; |
2501 | u32 nritems; | |
02217ed2 | 2502 | int i; |
db94535d | 2503 | int level; |
31840ae1 | 2504 | int ret = 0; |
e4657689 | 2505 | int shared = 0; |
a28ec197 | 2506 | |
3768f368 | 2507 | if (!root->ref_cows) |
a28ec197 | 2508 | return 0; |
5f39d397 | 2509 | |
e4657689 ZY |
2510 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
2511 | shared = 0; | |
2512 | root_gen = root->root_key.offset; | |
2513 | } else { | |
2514 | shared = 1; | |
2515 | root_gen = trans->transid - 1; | |
2516 | } | |
2517 | ||
db94535d | 2518 | level = btrfs_header_level(buf); |
5f39d397 | 2519 | nritems = btrfs_header_nritems(buf); |
4a096752 | 2520 | |
31840ae1 | 2521 | if (level == 0) { |
31153d81 YZ |
2522 | struct btrfs_leaf_ref *ref; |
2523 | struct btrfs_extent_info *info; | |
2524 | ||
31840ae1 | 2525 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 2526 | if (!ref) { |
31840ae1 | 2527 | ret = -ENOMEM; |
31153d81 YZ |
2528 | goto out; |
2529 | } | |
2530 | ||
e4657689 | 2531 | ref->root_gen = root_gen; |
31153d81 YZ |
2532 | ref->bytenr = buf->start; |
2533 | ref->owner = btrfs_header_owner(buf); | |
2534 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 2535 | ref->nritems = nr_extents; |
31153d81 | 2536 | info = ref->extents; |
bcc63abb | 2537 | |
31840ae1 | 2538 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
2539 | u64 disk_bytenr; |
2540 | btrfs_item_key_to_cpu(buf, &key, i); | |
2541 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
2542 | continue; | |
2543 | fi = btrfs_item_ptr(buf, i, | |
2544 | struct btrfs_file_extent_item); | |
2545 | if (btrfs_file_extent_type(buf, fi) == | |
2546 | BTRFS_FILE_EXTENT_INLINE) | |
2547 | continue; | |
2548 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2549 | if (disk_bytenr == 0) | |
2550 | continue; | |
2551 | ||
2552 | info->bytenr = disk_bytenr; | |
2553 | info->num_bytes = | |
2554 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
2555 | info->objectid = key.objectid; | |
2556 | info->offset = key.offset; | |
2557 | info++; | |
2558 | } | |
2559 | ||
e4657689 | 2560 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
2561 | if (ret == -EEXIST && shared) { |
2562 | struct btrfs_leaf_ref *old; | |
2563 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
2564 | BUG_ON(!old); | |
2565 | btrfs_remove_leaf_ref(root, old); | |
2566 | btrfs_free_leaf_ref(root, old); | |
2567 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
2568 | } | |
31153d81 | 2569 | WARN_ON(ret); |
bcc63abb | 2570 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
2571 | } |
2572 | out: | |
31840ae1 ZY |
2573 | return ret; |
2574 | } | |
2575 | ||
b7a9f29f CM |
2576 | /* when a block goes through cow, we update the reference counts of |
2577 | * everything that block points to. The internal pointers of the block | |
2578 | * can be in just about any order, and it is likely to have clusters of | |
2579 | * things that are close together and clusters of things that are not. | |
2580 | * | |
2581 | * To help reduce the seeks that come with updating all of these reference | |
2582 | * counts, sort them by byte number before actual updates are done. | |
2583 | * | |
2584 | * struct refsort is used to match byte number to slot in the btree block. | |
2585 | * we sort based on the byte number and then use the slot to actually | |
2586 | * find the item. | |
bd56b302 CM |
2587 | * |
2588 | * struct refsort is smaller than strcut btrfs_item and smaller than | |
2589 | * struct btrfs_key_ptr. Since we're currently limited to the page size | |
2590 | * for a btree block, there's no way for a kmalloc of refsorts for a | |
2591 | * single node to be bigger than a page. | |
b7a9f29f CM |
2592 | */ |
2593 | struct refsort { | |
2594 | u64 bytenr; | |
2595 | u32 slot; | |
2596 | }; | |
2597 | ||
2598 | /* | |
2599 | * for passing into sort() | |
2600 | */ | |
2601 | static int refsort_cmp(const void *a_void, const void *b_void) | |
2602 | { | |
2603 | const struct refsort *a = a_void; | |
2604 | const struct refsort *b = b_void; | |
2605 | ||
2606 | if (a->bytenr < b->bytenr) | |
2607 | return -1; | |
2608 | if (a->bytenr > b->bytenr) | |
2609 | return 1; | |
2610 | return 0; | |
2611 | } | |
5d4f98a2 | 2612 | #endif |
b7a9f29f | 2613 | |
5d4f98a2 | 2614 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2615 | struct btrfs_root *root, |
5d4f98a2 YZ |
2616 | struct extent_buffer *buf, |
2617 | int full_backref, int inc) | |
31840ae1 ZY |
2618 | { |
2619 | u64 bytenr; | |
5d4f98a2 YZ |
2620 | u64 num_bytes; |
2621 | u64 parent; | |
31840ae1 | 2622 | u64 ref_root; |
31840ae1 | 2623 | u32 nritems; |
31840ae1 ZY |
2624 | struct btrfs_key key; |
2625 | struct btrfs_file_extent_item *fi; | |
2626 | int i; | |
2627 | int level; | |
2628 | int ret = 0; | |
31840ae1 | 2629 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
5d4f98a2 | 2630 | u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
2631 | |
2632 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2633 | nritems = btrfs_header_nritems(buf); |
2634 | level = btrfs_header_level(buf); | |
2635 | ||
5d4f98a2 YZ |
2636 | if (!root->ref_cows && level == 0) |
2637 | return 0; | |
31840ae1 | 2638 | |
5d4f98a2 YZ |
2639 | if (inc) |
2640 | process_func = btrfs_inc_extent_ref; | |
2641 | else | |
2642 | process_func = btrfs_free_extent; | |
31840ae1 | 2643 | |
5d4f98a2 YZ |
2644 | if (full_backref) |
2645 | parent = buf->start; | |
2646 | else | |
2647 | parent = 0; | |
2648 | ||
2649 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2650 | if (level == 0) { |
5d4f98a2 | 2651 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2652 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2653 | continue; | |
5d4f98a2 | 2654 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2655 | struct btrfs_file_extent_item); |
2656 | if (btrfs_file_extent_type(buf, fi) == | |
2657 | BTRFS_FILE_EXTENT_INLINE) | |
2658 | continue; | |
2659 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2660 | if (bytenr == 0) | |
2661 | continue; | |
5d4f98a2 YZ |
2662 | |
2663 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2664 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2665 | ret = process_func(trans, root, bytenr, num_bytes, | |
2666 | parent, ref_root, key.objectid, | |
2667 | key.offset); | |
31840ae1 ZY |
2668 | if (ret) |
2669 | goto fail; | |
2670 | } else { | |
5d4f98a2 YZ |
2671 | bytenr = btrfs_node_blockptr(buf, i); |
2672 | num_bytes = btrfs_level_size(root, level - 1); | |
2673 | ret = process_func(trans, root, bytenr, num_bytes, | |
2674 | parent, ref_root, level - 1, 0); | |
31840ae1 ZY |
2675 | if (ret) |
2676 | goto fail; | |
2677 | } | |
2678 | } | |
2679 | return 0; | |
2680 | fail: | |
5d4f98a2 YZ |
2681 | BUG(); |
2682 | return ret; | |
2683 | } | |
2684 | ||
2685 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2686 | struct extent_buffer *buf, int full_backref) | |
2687 | { | |
2688 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
2689 | } | |
2690 | ||
2691 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2692 | struct extent_buffer *buf, int full_backref) | |
2693 | { | |
2694 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
31840ae1 ZY |
2695 | } |
2696 | ||
9078a3e1 CM |
2697 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2698 | struct btrfs_root *root, | |
2699 | struct btrfs_path *path, | |
2700 | struct btrfs_block_group_cache *cache) | |
2701 | { | |
2702 | int ret; | |
9078a3e1 | 2703 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2704 | unsigned long bi; |
2705 | struct extent_buffer *leaf; | |
9078a3e1 | 2706 | |
9078a3e1 | 2707 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2708 | if (ret < 0) |
2709 | goto fail; | |
9078a3e1 | 2710 | BUG_ON(ret); |
5f39d397 CM |
2711 | |
2712 | leaf = path->nodes[0]; | |
2713 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2714 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2715 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 2716 | btrfs_release_path(extent_root, path); |
54aa1f4d | 2717 | fail: |
9078a3e1 CM |
2718 | if (ret) |
2719 | return ret; | |
9078a3e1 CM |
2720 | return 0; |
2721 | ||
2722 | } | |
2723 | ||
4a8c9a62 YZ |
2724 | static struct btrfs_block_group_cache * |
2725 | next_block_group(struct btrfs_root *root, | |
2726 | struct btrfs_block_group_cache *cache) | |
2727 | { | |
2728 | struct rb_node *node; | |
2729 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2730 | node = rb_next(&cache->cache_node); | |
2731 | btrfs_put_block_group(cache); | |
2732 | if (node) { | |
2733 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2734 | cache_node); | |
11dfe35a | 2735 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2736 | } else |
2737 | cache = NULL; | |
2738 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2739 | return cache; | |
2740 | } | |
2741 | ||
0af3d00b JB |
2742 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
2743 | struct btrfs_trans_handle *trans, | |
2744 | struct btrfs_path *path) | |
2745 | { | |
2746 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
2747 | struct inode *inode = NULL; | |
2748 | u64 alloc_hint = 0; | |
2b20982e | 2749 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
2750 | int num_pages = 0; |
2751 | int retries = 0; | |
2752 | int ret = 0; | |
2753 | ||
2754 | /* | |
2755 | * If this block group is smaller than 100 megs don't bother caching the | |
2756 | * block group. | |
2757 | */ | |
2758 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
2759 | spin_lock(&block_group->lock); | |
2760 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
2761 | spin_unlock(&block_group->lock); | |
2762 | return 0; | |
2763 | } | |
2764 | ||
2765 | again: | |
2766 | inode = lookup_free_space_inode(root, block_group, path); | |
2767 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
2768 | ret = PTR_ERR(inode); | |
2769 | btrfs_release_path(root, path); | |
2770 | goto out; | |
2771 | } | |
2772 | ||
2773 | if (IS_ERR(inode)) { | |
2774 | BUG_ON(retries); | |
2775 | retries++; | |
2776 | ||
2777 | if (block_group->ro) | |
2778 | goto out_free; | |
2779 | ||
2780 | ret = create_free_space_inode(root, trans, block_group, path); | |
2781 | if (ret) | |
2782 | goto out_free; | |
2783 | goto again; | |
2784 | } | |
2785 | ||
2786 | /* | |
2787 | * We want to set the generation to 0, that way if anything goes wrong | |
2788 | * from here on out we know not to trust this cache when we load up next | |
2789 | * time. | |
2790 | */ | |
2791 | BTRFS_I(inode)->generation = 0; | |
2792 | ret = btrfs_update_inode(trans, root, inode); | |
2793 | WARN_ON(ret); | |
2794 | ||
2795 | if (i_size_read(inode) > 0) { | |
2796 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
2797 | inode); | |
2798 | if (ret) | |
2799 | goto out_put; | |
2800 | } | |
2801 | ||
2802 | spin_lock(&block_group->lock); | |
2803 | if (block_group->cached != BTRFS_CACHE_FINISHED) { | |
2b20982e JB |
2804 | /* We're not cached, don't bother trying to write stuff out */ |
2805 | dcs = BTRFS_DC_WRITTEN; | |
0af3d00b JB |
2806 | spin_unlock(&block_group->lock); |
2807 | goto out_put; | |
2808 | } | |
2809 | spin_unlock(&block_group->lock); | |
2810 | ||
2811 | num_pages = (int)div64_u64(block_group->key.offset, 1024 * 1024 * 1024); | |
2812 | if (!num_pages) | |
2813 | num_pages = 1; | |
2814 | ||
2815 | /* | |
2816 | * Just to make absolutely sure we have enough space, we're going to | |
2817 | * preallocate 12 pages worth of space for each block group. In | |
2818 | * practice we ought to use at most 8, but we need extra space so we can | |
2819 | * add our header and have a terminator between the extents and the | |
2820 | * bitmaps. | |
2821 | */ | |
2822 | num_pages *= 16; | |
2823 | num_pages *= PAGE_CACHE_SIZE; | |
2824 | ||
2825 | ret = btrfs_check_data_free_space(inode, num_pages); | |
2826 | if (ret) | |
2827 | goto out_put; | |
2828 | ||
2829 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
2830 | num_pages, num_pages, | |
2831 | &alloc_hint); | |
2b20982e JB |
2832 | if (!ret) |
2833 | dcs = BTRFS_DC_SETUP; | |
0af3d00b JB |
2834 | btrfs_free_reserved_data_space(inode, num_pages); |
2835 | out_put: | |
2836 | iput(inode); | |
2837 | out_free: | |
2838 | btrfs_release_path(root, path); | |
2839 | out: | |
2840 | spin_lock(&block_group->lock); | |
2b20982e | 2841 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
2842 | spin_unlock(&block_group->lock); |
2843 | ||
2844 | return ret; | |
2845 | } | |
2846 | ||
96b5179d CM |
2847 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
2848 | struct btrfs_root *root) | |
9078a3e1 | 2849 | { |
4a8c9a62 | 2850 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 2851 | int err = 0; |
9078a3e1 | 2852 | struct btrfs_path *path; |
96b5179d | 2853 | u64 last = 0; |
9078a3e1 CM |
2854 | |
2855 | path = btrfs_alloc_path(); | |
2856 | if (!path) | |
2857 | return -ENOMEM; | |
2858 | ||
0af3d00b JB |
2859 | again: |
2860 | while (1) { | |
2861 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2862 | while (cache) { | |
2863 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
2864 | break; | |
2865 | cache = next_block_group(root, cache); | |
2866 | } | |
2867 | if (!cache) { | |
2868 | if (last == 0) | |
2869 | break; | |
2870 | last = 0; | |
2871 | continue; | |
2872 | } | |
2873 | err = cache_save_setup(cache, trans, path); | |
2874 | last = cache->key.objectid + cache->key.offset; | |
2875 | btrfs_put_block_group(cache); | |
2876 | } | |
2877 | ||
d397712b | 2878 | while (1) { |
4a8c9a62 YZ |
2879 | if (last == 0) { |
2880 | err = btrfs_run_delayed_refs(trans, root, | |
2881 | (unsigned long)-1); | |
2882 | BUG_ON(err); | |
0f9dd46c | 2883 | } |
54aa1f4d | 2884 | |
4a8c9a62 YZ |
2885 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
2886 | while (cache) { | |
0af3d00b JB |
2887 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
2888 | btrfs_put_block_group(cache); | |
2889 | goto again; | |
2890 | } | |
2891 | ||
4a8c9a62 YZ |
2892 | if (cache->dirty) |
2893 | break; | |
2894 | cache = next_block_group(root, cache); | |
2895 | } | |
2896 | if (!cache) { | |
2897 | if (last == 0) | |
2898 | break; | |
2899 | last = 0; | |
2900 | continue; | |
2901 | } | |
0f9dd46c | 2902 | |
0cb59c99 JB |
2903 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
2904 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 2905 | cache->dirty = 0; |
4a8c9a62 | 2906 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 2907 | |
4a8c9a62 YZ |
2908 | err = write_one_cache_group(trans, root, path, cache); |
2909 | BUG_ON(err); | |
2910 | btrfs_put_block_group(cache); | |
9078a3e1 | 2911 | } |
4a8c9a62 | 2912 | |
0cb59c99 JB |
2913 | while (1) { |
2914 | /* | |
2915 | * I don't think this is needed since we're just marking our | |
2916 | * preallocated extent as written, but just in case it can't | |
2917 | * hurt. | |
2918 | */ | |
2919 | if (last == 0) { | |
2920 | err = btrfs_run_delayed_refs(trans, root, | |
2921 | (unsigned long)-1); | |
2922 | BUG_ON(err); | |
2923 | } | |
2924 | ||
2925 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2926 | while (cache) { | |
2927 | /* | |
2928 | * Really this shouldn't happen, but it could if we | |
2929 | * couldn't write the entire preallocated extent and | |
2930 | * splitting the extent resulted in a new block. | |
2931 | */ | |
2932 | if (cache->dirty) { | |
2933 | btrfs_put_block_group(cache); | |
2934 | goto again; | |
2935 | } | |
2936 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2937 | break; | |
2938 | cache = next_block_group(root, cache); | |
2939 | } | |
2940 | if (!cache) { | |
2941 | if (last == 0) | |
2942 | break; | |
2943 | last = 0; | |
2944 | continue; | |
2945 | } | |
2946 | ||
2947 | btrfs_write_out_cache(root, trans, cache, path); | |
2948 | ||
2949 | /* | |
2950 | * If we didn't have an error then the cache state is still | |
2951 | * NEED_WRITE, so we can set it to WRITTEN. | |
2952 | */ | |
2953 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2954 | cache->disk_cache_state = BTRFS_DC_WRITTEN; | |
2955 | last = cache->key.objectid + cache->key.offset; | |
2956 | btrfs_put_block_group(cache); | |
2957 | } | |
2958 | ||
9078a3e1 | 2959 | btrfs_free_path(path); |
4a8c9a62 | 2960 | return 0; |
9078a3e1 CM |
2961 | } |
2962 | ||
d2fb3437 YZ |
2963 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
2964 | { | |
2965 | struct btrfs_block_group_cache *block_group; | |
2966 | int readonly = 0; | |
2967 | ||
2968 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
2969 | if (!block_group || block_group->ro) | |
2970 | readonly = 1; | |
2971 | if (block_group) | |
fa9c0d79 | 2972 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
2973 | return readonly; |
2974 | } | |
2975 | ||
593060d7 CM |
2976 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
2977 | u64 total_bytes, u64 bytes_used, | |
2978 | struct btrfs_space_info **space_info) | |
2979 | { | |
2980 | struct btrfs_space_info *found; | |
b742bb82 YZ |
2981 | int i; |
2982 | int factor; | |
2983 | ||
2984 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
2985 | BTRFS_BLOCK_GROUP_RAID10)) | |
2986 | factor = 2; | |
2987 | else | |
2988 | factor = 1; | |
593060d7 CM |
2989 | |
2990 | found = __find_space_info(info, flags); | |
2991 | if (found) { | |
25179201 | 2992 | spin_lock(&found->lock); |
593060d7 | 2993 | found->total_bytes += total_bytes; |
89a55897 | 2994 | found->disk_total += total_bytes * factor; |
593060d7 | 2995 | found->bytes_used += bytes_used; |
b742bb82 | 2996 | found->disk_used += bytes_used * factor; |
8f18cf13 | 2997 | found->full = 0; |
25179201 | 2998 | spin_unlock(&found->lock); |
593060d7 CM |
2999 | *space_info = found; |
3000 | return 0; | |
3001 | } | |
c146afad | 3002 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3003 | if (!found) |
3004 | return -ENOMEM; | |
3005 | ||
b742bb82 YZ |
3006 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
3007 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 3008 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3009 | spin_lock_init(&found->lock); |
b742bb82 YZ |
3010 | found->flags = flags & (BTRFS_BLOCK_GROUP_DATA | |
3011 | BTRFS_BLOCK_GROUP_SYSTEM | | |
3012 | BTRFS_BLOCK_GROUP_METADATA); | |
593060d7 | 3013 | found->total_bytes = total_bytes; |
89a55897 | 3014 | found->disk_total = total_bytes * factor; |
593060d7 | 3015 | found->bytes_used = bytes_used; |
b742bb82 | 3016 | found->disk_used = bytes_used * factor; |
593060d7 | 3017 | found->bytes_pinned = 0; |
e8569813 | 3018 | found->bytes_reserved = 0; |
c146afad | 3019 | found->bytes_readonly = 0; |
f0486c68 | 3020 | found->bytes_may_use = 0; |
593060d7 | 3021 | found->full = 0; |
0ef3e66b | 3022 | found->force_alloc = 0; |
593060d7 | 3023 | *space_info = found; |
4184ea7f | 3024 | list_add_rcu(&found->list, &info->space_info); |
817d52f8 | 3025 | atomic_set(&found->caching_threads, 0); |
593060d7 CM |
3026 | return 0; |
3027 | } | |
3028 | ||
8790d502 CM |
3029 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3030 | { | |
3031 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 3032 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 3033 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 3034 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
3035 | if (extra_flags) { |
3036 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3037 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3038 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3039 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3040 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3041 | fs_info->avail_system_alloc_bits |= extra_flags; | |
3042 | } | |
3043 | } | |
593060d7 | 3044 | |
2b82032c | 3045 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3046 | { |
cd02dca5 CM |
3047 | /* |
3048 | * we add in the count of missing devices because we want | |
3049 | * to make sure that any RAID levels on a degraded FS | |
3050 | * continue to be honored. | |
3051 | */ | |
3052 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3053 | root->fs_info->fs_devices->missing_devices; | |
a061fc8d CM |
3054 | |
3055 | if (num_devices == 1) | |
3056 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
3057 | if (num_devices < 4) | |
3058 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3059 | ||
ec44a35c CM |
3060 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
3061 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 3062 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 3063 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 3064 | } |
ec44a35c CM |
3065 | |
3066 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 3067 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 3068 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 3069 | } |
ec44a35c CM |
3070 | |
3071 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
3072 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
3073 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
3074 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
3075 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
3076 | return flags; | |
3077 | } | |
3078 | ||
b742bb82 | 3079 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3080 | { |
b742bb82 YZ |
3081 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3082 | flags |= root->fs_info->avail_data_alloc_bits & | |
3083 | root->fs_info->data_alloc_profile; | |
3084 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3085 | flags |= root->fs_info->avail_system_alloc_bits & | |
3086 | root->fs_info->system_alloc_profile; | |
3087 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3088 | flags |= root->fs_info->avail_metadata_alloc_bits & | |
3089 | root->fs_info->metadata_alloc_profile; | |
3090 | return btrfs_reduce_alloc_profile(root, flags); | |
6a63209f JB |
3091 | } |
3092 | ||
b742bb82 | 3093 | static u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3094 | { |
b742bb82 | 3095 | u64 flags; |
9ed74f2d | 3096 | |
b742bb82 YZ |
3097 | if (data) |
3098 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3099 | else if (root == root->fs_info->chunk_root) | |
3100 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3101 | else |
b742bb82 | 3102 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3103 | |
b742bb82 | 3104 | return get_alloc_profile(root, flags); |
6a63209f | 3105 | } |
9ed74f2d | 3106 | |
6a63209f JB |
3107 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) |
3108 | { | |
6a63209f | 3109 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, |
f0486c68 | 3110 | BTRFS_BLOCK_GROUP_DATA); |
9ed74f2d JB |
3111 | } |
3112 | ||
6a63209f | 3113 | /* |
6a63209f JB |
3114 | * This will check the space that the inode allocates from to make sure we have |
3115 | * enough space for bytes. | |
6a63209f | 3116 | */ |
0ca1f7ce | 3117 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3118 | { |
6a63209f | 3119 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3120 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ab6e2410 | 3121 | u64 used; |
0af3d00b | 3122 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3123 | |
6a63209f JB |
3124 | /* make sure bytes are sectorsize aligned */ |
3125 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
6a63209f | 3126 | |
0af3d00b JB |
3127 | if (root == root->fs_info->tree_root) { |
3128 | alloc_chunk = 0; | |
3129 | committed = 1; | |
3130 | } | |
3131 | ||
6a63209f | 3132 | data_sinfo = BTRFS_I(inode)->space_info; |
33b4d47f CM |
3133 | if (!data_sinfo) |
3134 | goto alloc; | |
9ed74f2d | 3135 | |
6a63209f JB |
3136 | again: |
3137 | /* make sure we have enough space to handle the data first */ | |
3138 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3139 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3140 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3141 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3142 | |
3143 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3144 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3145 | |
6a63209f JB |
3146 | /* |
3147 | * if we don't have enough free bytes in this space then we need | |
3148 | * to alloc a new chunk. | |
3149 | */ | |
0af3d00b | 3150 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3151 | u64 alloc_target; |
9ed74f2d | 3152 | |
6a63209f JB |
3153 | data_sinfo->force_alloc = 1; |
3154 | spin_unlock(&data_sinfo->lock); | |
33b4d47f | 3155 | alloc: |
6a63209f | 3156 | alloc_target = btrfs_get_alloc_profile(root, 1); |
a22285a6 YZ |
3157 | trans = btrfs_join_transaction(root, 1); |
3158 | if (IS_ERR(trans)) | |
3159 | return PTR_ERR(trans); | |
9ed74f2d | 3160 | |
6a63209f JB |
3161 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
3162 | bytes + 2 * 1024 * 1024, | |
3163 | alloc_target, 0); | |
3164 | btrfs_end_transaction(trans, root); | |
d52a5b5f MX |
3165 | if (ret < 0) { |
3166 | if (ret != -ENOSPC) | |
3167 | return ret; | |
3168 | else | |
3169 | goto commit_trans; | |
3170 | } | |
9ed74f2d | 3171 | |
33b4d47f CM |
3172 | if (!data_sinfo) { |
3173 | btrfs_set_inode_space_info(root, inode); | |
3174 | data_sinfo = BTRFS_I(inode)->space_info; | |
3175 | } | |
6a63209f JB |
3176 | goto again; |
3177 | } | |
3178 | spin_unlock(&data_sinfo->lock); | |
6a63209f | 3179 | |
4e06bdd6 | 3180 | /* commit the current transaction and try again */ |
d52a5b5f | 3181 | commit_trans: |
dd7e0b7b | 3182 | if (!committed && !root->fs_info->open_ioctl_trans) { |
4e06bdd6 JB |
3183 | committed = 1; |
3184 | trans = btrfs_join_transaction(root, 1); | |
a22285a6 YZ |
3185 | if (IS_ERR(trans)) |
3186 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3187 | ret = btrfs_commit_transaction(trans, root); |
3188 | if (ret) | |
3189 | return ret; | |
3190 | goto again; | |
3191 | } | |
9ed74f2d | 3192 | |
933b585f | 3193 | #if 0 /* I hope we never need this code again, just in case */ |
8929ecfa YZ |
3194 | printk(KERN_ERR "no space left, need %llu, %llu bytes_used, " |
3195 | "%llu bytes_reserved, " "%llu bytes_pinned, " | |
3196 | "%llu bytes_readonly, %llu may use %llu total\n", | |
3197 | (unsigned long long)bytes, | |
21380931 JB |
3198 | (unsigned long long)data_sinfo->bytes_used, |
3199 | (unsigned long long)data_sinfo->bytes_reserved, | |
3200 | (unsigned long long)data_sinfo->bytes_pinned, | |
3201 | (unsigned long long)data_sinfo->bytes_readonly, | |
3202 | (unsigned long long)data_sinfo->bytes_may_use, | |
3203 | (unsigned long long)data_sinfo->total_bytes); | |
933b585f | 3204 | #endif |
6a63209f JB |
3205 | return -ENOSPC; |
3206 | } | |
3207 | data_sinfo->bytes_may_use += bytes; | |
3208 | BTRFS_I(inode)->reserved_bytes += bytes; | |
3209 | spin_unlock(&data_sinfo->lock); | |
6a63209f | 3210 | |
9ed74f2d | 3211 | return 0; |
9ed74f2d | 3212 | } |
6a63209f | 3213 | |
6a63209f | 3214 | /* |
0ca1f7ce YZ |
3215 | * called when we are clearing an delalloc extent from the |
3216 | * inode's io_tree or there was an error for whatever reason | |
3217 | * after calling btrfs_check_data_free_space | |
6a63209f | 3218 | */ |
0ca1f7ce | 3219 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3220 | { |
0ca1f7ce | 3221 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3222 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3223 | |
6a63209f JB |
3224 | /* make sure bytes are sectorsize aligned */ |
3225 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
e3ccfa98 | 3226 | |
6a63209f JB |
3227 | data_sinfo = BTRFS_I(inode)->space_info; |
3228 | spin_lock(&data_sinfo->lock); | |
3229 | data_sinfo->bytes_may_use -= bytes; | |
3230 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
3231 | spin_unlock(&data_sinfo->lock); | |
e3ccfa98 JB |
3232 | } |
3233 | ||
97e728d4 | 3234 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3235 | { |
97e728d4 JB |
3236 | struct list_head *head = &info->space_info; |
3237 | struct btrfs_space_info *found; | |
e3ccfa98 | 3238 | |
97e728d4 JB |
3239 | rcu_read_lock(); |
3240 | list_for_each_entry_rcu(found, head, list) { | |
3241 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
3242 | found->force_alloc = 1; | |
e3ccfa98 | 3243 | } |
97e728d4 | 3244 | rcu_read_unlock(); |
e3ccfa98 JB |
3245 | } |
3246 | ||
e5bc2458 CM |
3247 | static int should_alloc_chunk(struct btrfs_root *root, |
3248 | struct btrfs_space_info *sinfo, u64 alloc_bytes) | |
32c00aff | 3249 | { |
424499db | 3250 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
e5bc2458 | 3251 | u64 thresh; |
e3ccfa98 | 3252 | |
424499db YZ |
3253 | if (sinfo->bytes_used + sinfo->bytes_reserved + |
3254 | alloc_bytes + 256 * 1024 * 1024 < num_bytes) | |
3255 | return 0; | |
e3ccfa98 | 3256 | |
424499db YZ |
3257 | if (sinfo->bytes_used + sinfo->bytes_reserved + |
3258 | alloc_bytes < div_factor(num_bytes, 8)) | |
3259 | return 0; | |
32c00aff | 3260 | |
e5bc2458 CM |
3261 | thresh = btrfs_super_total_bytes(&root->fs_info->super_copy); |
3262 | thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5)); | |
3263 | ||
3264 | if (num_bytes > thresh && sinfo->bytes_used < div_factor(num_bytes, 3)) | |
14ed0ca6 JB |
3265 | return 0; |
3266 | ||
424499db | 3267 | return 1; |
32c00aff JB |
3268 | } |
3269 | ||
6324fbf3 CM |
3270 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
3271 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 3272 | u64 flags, int force) |
9ed74f2d | 3273 | { |
6324fbf3 | 3274 | struct btrfs_space_info *space_info; |
97e728d4 | 3275 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
9ed74f2d | 3276 | int ret = 0; |
9ed74f2d | 3277 | |
97e728d4 | 3278 | mutex_lock(&fs_info->chunk_mutex); |
9ed74f2d | 3279 | |
2b82032c | 3280 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 3281 | |
6324fbf3 | 3282 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3283 | if (!space_info) { |
3284 | ret = update_space_info(extent_root->fs_info, flags, | |
3285 | 0, 0, &space_info); | |
3286 | BUG_ON(ret); | |
9ed74f2d | 3287 | } |
6324fbf3 | 3288 | BUG_ON(!space_info); |
9ed74f2d | 3289 | |
25179201 | 3290 | spin_lock(&space_info->lock); |
9ed74f2d | 3291 | if (space_info->force_alloc) |
0ef3e66b | 3292 | force = 1; |
25179201 JB |
3293 | if (space_info->full) { |
3294 | spin_unlock(&space_info->lock); | |
925baedd | 3295 | goto out; |
9ed74f2d JB |
3296 | } |
3297 | ||
e5bc2458 CM |
3298 | if (!force && !should_alloc_chunk(extent_root, space_info, |
3299 | alloc_bytes)) { | |
25179201 | 3300 | spin_unlock(&space_info->lock); |
925baedd | 3301 | goto out; |
9ed74f2d | 3302 | } |
25179201 | 3303 | spin_unlock(&space_info->lock); |
9ed74f2d | 3304 | |
67377734 JB |
3305 | /* |
3306 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3307 | * allocating mixed chunks instead of individual chunks. | |
3308 | */ | |
3309 | if (btrfs_mixed_space_info(space_info)) | |
3310 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3311 | ||
97e728d4 JB |
3312 | /* |
3313 | * if we're doing a data chunk, go ahead and make sure that | |
3314 | * we keep a reasonable number of metadata chunks allocated in the | |
3315 | * FS as well. | |
3316 | */ | |
9ed74f2d | 3317 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3318 | fs_info->data_chunk_allocations++; |
3319 | if (!(fs_info->data_chunk_allocations % | |
3320 | fs_info->metadata_ratio)) | |
3321 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3322 | } |
3323 | ||
2b82032c | 3324 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
9ed74f2d | 3325 | spin_lock(&space_info->lock); |
9ed74f2d | 3326 | if (ret) |
6324fbf3 | 3327 | space_info->full = 1; |
424499db YZ |
3328 | else |
3329 | ret = 1; | |
9ed74f2d JB |
3330 | space_info->force_alloc = 0; |
3331 | spin_unlock(&space_info->lock); | |
9ed74f2d | 3332 | out: |
c146afad | 3333 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 3334 | return ret; |
6324fbf3 | 3335 | } |
9ed74f2d | 3336 | |
9ed74f2d | 3337 | /* |
5da9d01b | 3338 | * shrink metadata reservation for delalloc |
9ed74f2d | 3339 | */ |
5da9d01b | 3340 | static int shrink_delalloc(struct btrfs_trans_handle *trans, |
0019f10d | 3341 | struct btrfs_root *root, u64 to_reclaim, int sync) |
5da9d01b | 3342 | { |
0ca1f7ce | 3343 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3344 | struct btrfs_space_info *space_info; |
5da9d01b YZ |
3345 | u64 reserved; |
3346 | u64 max_reclaim; | |
3347 | u64 reclaimed = 0; | |
3348 | int pause = 1; | |
bf9022e0 | 3349 | int nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
5da9d01b | 3350 | |
0ca1f7ce | 3351 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3352 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3353 | |
3354 | smp_mb(); | |
0019f10d | 3355 | reserved = space_info->bytes_reserved; |
5da9d01b YZ |
3356 | |
3357 | if (reserved == 0) | |
3358 | return 0; | |
3359 | ||
3360 | max_reclaim = min(reserved, to_reclaim); | |
3361 | ||
3362 | while (1) { | |
bf9022e0 CM |
3363 | /* have the flusher threads jump in and do some IO */ |
3364 | smp_mb(); | |
3365 | nr_pages = min_t(unsigned long, nr_pages, | |
3366 | root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT); | |
3367 | writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages); | |
5da9d01b | 3368 | |
0019f10d JB |
3369 | spin_lock(&space_info->lock); |
3370 | if (reserved > space_info->bytes_reserved) | |
3371 | reclaimed += reserved - space_info->bytes_reserved; | |
3372 | reserved = space_info->bytes_reserved; | |
3373 | spin_unlock(&space_info->lock); | |
5da9d01b YZ |
3374 | |
3375 | if (reserved == 0 || reclaimed >= max_reclaim) | |
3376 | break; | |
3377 | ||
3378 | if (trans && trans->transaction->blocked) | |
3379 | return -EAGAIN; | |
bf9022e0 CM |
3380 | |
3381 | __set_current_state(TASK_INTERRUPTIBLE); | |
3382 | schedule_timeout(pause); | |
3383 | pause <<= 1; | |
3384 | if (pause > HZ / 10) | |
3385 | pause = HZ / 10; | |
3386 | ||
5da9d01b YZ |
3387 | } |
3388 | return reclaimed >= to_reclaim; | |
3389 | } | |
3390 | ||
8bb8ab2e JB |
3391 | /* |
3392 | * Retries tells us how many times we've called reserve_metadata_bytes. The | |
3393 | * idea is if this is the first call (retries == 0) then we will add to our | |
3394 | * reserved count if we can't make the allocation in order to hold our place | |
3395 | * while we go and try and free up space. That way for retries > 1 we don't try | |
3396 | * and add space, we just check to see if the amount of unused space is >= the | |
3397 | * total space, meaning that our reservation is valid. | |
3398 | * | |
3399 | * However if we don't intend to retry this reservation, pass -1 as retries so | |
3400 | * that it short circuits this logic. | |
3401 | */ | |
3402 | static int reserve_metadata_bytes(struct btrfs_trans_handle *trans, | |
3403 | struct btrfs_root *root, | |
3404 | struct btrfs_block_rsv *block_rsv, | |
3405 | u64 orig_bytes, int flush) | |
9ed74f2d | 3406 | { |
f0486c68 | 3407 | struct btrfs_space_info *space_info = block_rsv->space_info; |
8bb8ab2e JB |
3408 | u64 unused; |
3409 | u64 num_bytes = orig_bytes; | |
3410 | int retries = 0; | |
3411 | int ret = 0; | |
3412 | bool reserved = false; | |
38227933 | 3413 | bool committed = false; |
9ed74f2d | 3414 | |
8bb8ab2e JB |
3415 | again: |
3416 | ret = -ENOSPC; | |
3417 | if (reserved) | |
3418 | num_bytes = 0; | |
9ed74f2d | 3419 | |
8bb8ab2e JB |
3420 | spin_lock(&space_info->lock); |
3421 | unused = space_info->bytes_used + space_info->bytes_reserved + | |
3422 | space_info->bytes_pinned + space_info->bytes_readonly + | |
3423 | space_info->bytes_may_use; | |
9ed74f2d | 3424 | |
8bb8ab2e JB |
3425 | /* |
3426 | * The idea here is that we've not already over-reserved the block group | |
3427 | * then we can go ahead and save our reservation first and then start | |
3428 | * flushing if we need to. Otherwise if we've already overcommitted | |
3429 | * lets start flushing stuff first and then come back and try to make | |
3430 | * our reservation. | |
3431 | */ | |
3432 | if (unused <= space_info->total_bytes) { | |
6f334348 | 3433 | unused = space_info->total_bytes - unused; |
8bb8ab2e JB |
3434 | if (unused >= num_bytes) { |
3435 | if (!reserved) | |
3436 | space_info->bytes_reserved += orig_bytes; | |
3437 | ret = 0; | |
3438 | } else { | |
3439 | /* | |
3440 | * Ok set num_bytes to orig_bytes since we aren't | |
3441 | * overocmmitted, this way we only try and reclaim what | |
3442 | * we need. | |
3443 | */ | |
3444 | num_bytes = orig_bytes; | |
3445 | } | |
3446 | } else { | |
3447 | /* | |
3448 | * Ok we're over committed, set num_bytes to the overcommitted | |
3449 | * amount plus the amount of bytes that we need for this | |
3450 | * reservation. | |
3451 | */ | |
3452 | num_bytes = unused - space_info->total_bytes + | |
3453 | (orig_bytes * (retries + 1)); | |
3454 | } | |
9ed74f2d | 3455 | |
8bb8ab2e JB |
3456 | /* |
3457 | * Couldn't make our reservation, save our place so while we're trying | |
3458 | * to reclaim space we can actually use it instead of somebody else | |
3459 | * stealing it from us. | |
3460 | */ | |
3461 | if (ret && !reserved) { | |
3462 | space_info->bytes_reserved += orig_bytes; | |
3463 | reserved = true; | |
3464 | } | |
9ed74f2d | 3465 | |
f0486c68 | 3466 | spin_unlock(&space_info->lock); |
9ed74f2d | 3467 | |
8bb8ab2e JB |
3468 | if (!ret) |
3469 | return 0; | |
9ed74f2d | 3470 | |
8bb8ab2e JB |
3471 | if (!flush) |
3472 | goto out; | |
f0486c68 | 3473 | |
8bb8ab2e JB |
3474 | /* |
3475 | * We do synchronous shrinking since we don't actually unreserve | |
3476 | * metadata until after the IO is completed. | |
3477 | */ | |
3478 | ret = shrink_delalloc(trans, root, num_bytes, 1); | |
3479 | if (ret > 0) | |
3480 | return 0; | |
3481 | else if (ret < 0) | |
3482 | goto out; | |
f0486c68 | 3483 | |
8bb8ab2e JB |
3484 | /* |
3485 | * So if we were overcommitted it's possible that somebody else flushed | |
3486 | * out enough space and we simply didn't have enough space to reclaim, | |
3487 | * so go back around and try again. | |
3488 | */ | |
3489 | if (retries < 2) { | |
3490 | retries++; | |
3491 | goto again; | |
3492 | } | |
f0486c68 YZ |
3493 | |
3494 | spin_lock(&space_info->lock); | |
8bb8ab2e JB |
3495 | /* |
3496 | * Not enough space to be reclaimed, don't bother committing the | |
3497 | * transaction. | |
3498 | */ | |
3499 | if (space_info->bytes_pinned < orig_bytes) | |
3500 | ret = -ENOSPC; | |
3501 | spin_unlock(&space_info->lock); | |
3502 | if (ret) | |
3503 | goto out; | |
f0486c68 | 3504 | |
8bb8ab2e | 3505 | ret = -EAGAIN; |
38227933 | 3506 | if (trans || committed) |
8bb8ab2e | 3507 | goto out; |
f0486c68 | 3508 | |
8bb8ab2e JB |
3509 | ret = -ENOSPC; |
3510 | trans = btrfs_join_transaction(root, 1); | |
3511 | if (IS_ERR(trans)) | |
3512 | goto out; | |
3513 | ret = btrfs_commit_transaction(trans, root); | |
38227933 JB |
3514 | if (!ret) { |
3515 | trans = NULL; | |
3516 | committed = true; | |
8bb8ab2e | 3517 | goto again; |
38227933 | 3518 | } |
8bb8ab2e JB |
3519 | |
3520 | out: | |
3521 | if (reserved) { | |
3522 | spin_lock(&space_info->lock); | |
3523 | space_info->bytes_reserved -= orig_bytes; | |
3524 | spin_unlock(&space_info->lock); | |
f0486c68 | 3525 | } |
4e06bdd6 | 3526 | |
f0486c68 YZ |
3527 | return ret; |
3528 | } | |
3529 | ||
3530 | static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans, | |
3531 | struct btrfs_root *root) | |
3532 | { | |
3533 | struct btrfs_block_rsv *block_rsv; | |
3534 | if (root->ref_cows) | |
3535 | block_rsv = trans->block_rsv; | |
3536 | else | |
3537 | block_rsv = root->block_rsv; | |
3538 | ||
3539 | if (!block_rsv) | |
3540 | block_rsv = &root->fs_info->empty_block_rsv; | |
3541 | ||
3542 | return block_rsv; | |
3543 | } | |
3544 | ||
3545 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
3546 | u64 num_bytes) | |
3547 | { | |
3548 | int ret = -ENOSPC; | |
3549 | spin_lock(&block_rsv->lock); | |
3550 | if (block_rsv->reserved >= num_bytes) { | |
3551 | block_rsv->reserved -= num_bytes; | |
3552 | if (block_rsv->reserved < block_rsv->size) | |
3553 | block_rsv->full = 0; | |
3554 | ret = 0; | |
3555 | } | |
3556 | spin_unlock(&block_rsv->lock); | |
3557 | return ret; | |
3558 | } | |
3559 | ||
3560 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
3561 | u64 num_bytes, int update_size) | |
3562 | { | |
3563 | spin_lock(&block_rsv->lock); | |
3564 | block_rsv->reserved += num_bytes; | |
3565 | if (update_size) | |
3566 | block_rsv->size += num_bytes; | |
3567 | else if (block_rsv->reserved >= block_rsv->size) | |
3568 | block_rsv->full = 1; | |
3569 | spin_unlock(&block_rsv->lock); | |
3570 | } | |
3571 | ||
3572 | void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, | |
3573 | struct btrfs_block_rsv *dest, u64 num_bytes) | |
3574 | { | |
3575 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3576 | ||
3577 | spin_lock(&block_rsv->lock); | |
3578 | if (num_bytes == (u64)-1) | |
3579 | num_bytes = block_rsv->size; | |
3580 | block_rsv->size -= num_bytes; | |
3581 | if (block_rsv->reserved >= block_rsv->size) { | |
3582 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3583 | block_rsv->reserved = block_rsv->size; | |
3584 | block_rsv->full = 1; | |
3585 | } else { | |
3586 | num_bytes = 0; | |
3587 | } | |
3588 | spin_unlock(&block_rsv->lock); | |
3589 | ||
3590 | if (num_bytes > 0) { | |
3591 | if (dest) { | |
3592 | block_rsv_add_bytes(dest, num_bytes, 0); | |
3593 | } else { | |
3594 | spin_lock(&space_info->lock); | |
3595 | space_info->bytes_reserved -= num_bytes; | |
3596 | spin_unlock(&space_info->lock); | |
4e06bdd6 | 3597 | } |
9ed74f2d | 3598 | } |
f0486c68 | 3599 | } |
4e06bdd6 | 3600 | |
f0486c68 YZ |
3601 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
3602 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
3603 | { | |
3604 | int ret; | |
9ed74f2d | 3605 | |
f0486c68 YZ |
3606 | ret = block_rsv_use_bytes(src, num_bytes); |
3607 | if (ret) | |
3608 | return ret; | |
9ed74f2d | 3609 | |
f0486c68 | 3610 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
3611 | return 0; |
3612 | } | |
3613 | ||
f0486c68 | 3614 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv) |
9ed74f2d | 3615 | { |
f0486c68 YZ |
3616 | memset(rsv, 0, sizeof(*rsv)); |
3617 | spin_lock_init(&rsv->lock); | |
3618 | atomic_set(&rsv->usage, 1); | |
3619 | rsv->priority = 6; | |
3620 | INIT_LIST_HEAD(&rsv->list); | |
3621 | } | |
3622 | ||
3623 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root) | |
3624 | { | |
3625 | struct btrfs_block_rsv *block_rsv; | |
3626 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 3627 | |
f0486c68 YZ |
3628 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
3629 | if (!block_rsv) | |
3630 | return NULL; | |
9ed74f2d | 3631 | |
f0486c68 | 3632 | btrfs_init_block_rsv(block_rsv); |
f0486c68 YZ |
3633 | block_rsv->space_info = __find_space_info(fs_info, |
3634 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
3635 | return block_rsv; |
3636 | } | |
9ed74f2d | 3637 | |
f0486c68 YZ |
3638 | void btrfs_free_block_rsv(struct btrfs_root *root, |
3639 | struct btrfs_block_rsv *rsv) | |
3640 | { | |
3641 | if (rsv && atomic_dec_and_test(&rsv->usage)) { | |
3642 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
3643 | if (!rsv->durable) | |
3644 | kfree(rsv); | |
3645 | } | |
9ed74f2d JB |
3646 | } |
3647 | ||
3648 | /* | |
f0486c68 YZ |
3649 | * make the block_rsv struct be able to capture freed space. |
3650 | * the captured space will re-add to the the block_rsv struct | |
3651 | * after transaction commit | |
9ed74f2d | 3652 | */ |
f0486c68 YZ |
3653 | void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info, |
3654 | struct btrfs_block_rsv *block_rsv) | |
9ed74f2d | 3655 | { |
f0486c68 YZ |
3656 | block_rsv->durable = 1; |
3657 | mutex_lock(&fs_info->durable_block_rsv_mutex); | |
3658 | list_add_tail(&block_rsv->list, &fs_info->durable_block_rsv_list); | |
3659 | mutex_unlock(&fs_info->durable_block_rsv_mutex); | |
3660 | } | |
9ed74f2d | 3661 | |
f0486c68 YZ |
3662 | int btrfs_block_rsv_add(struct btrfs_trans_handle *trans, |
3663 | struct btrfs_root *root, | |
3664 | struct btrfs_block_rsv *block_rsv, | |
8bb8ab2e | 3665 | u64 num_bytes) |
f0486c68 YZ |
3666 | { |
3667 | int ret; | |
9ed74f2d | 3668 | |
f0486c68 YZ |
3669 | if (num_bytes == 0) |
3670 | return 0; | |
8bb8ab2e JB |
3671 | |
3672 | ret = reserve_metadata_bytes(trans, root, block_rsv, num_bytes, 1); | |
f0486c68 YZ |
3673 | if (!ret) { |
3674 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
3675 | return 0; | |
3676 | } | |
9ed74f2d | 3677 | |
f0486c68 YZ |
3678 | return ret; |
3679 | } | |
9ed74f2d | 3680 | |
f0486c68 YZ |
3681 | int btrfs_block_rsv_check(struct btrfs_trans_handle *trans, |
3682 | struct btrfs_root *root, | |
3683 | struct btrfs_block_rsv *block_rsv, | |
3684 | u64 min_reserved, int min_factor) | |
3685 | { | |
3686 | u64 num_bytes = 0; | |
3687 | int commit_trans = 0; | |
3688 | int ret = -ENOSPC; | |
9ed74f2d | 3689 | |
f0486c68 YZ |
3690 | if (!block_rsv) |
3691 | return 0; | |
9ed74f2d | 3692 | |
f0486c68 YZ |
3693 | spin_lock(&block_rsv->lock); |
3694 | if (min_factor > 0) | |
3695 | num_bytes = div_factor(block_rsv->size, min_factor); | |
3696 | if (min_reserved > num_bytes) | |
3697 | num_bytes = min_reserved; | |
9ed74f2d | 3698 | |
f0486c68 YZ |
3699 | if (block_rsv->reserved >= num_bytes) { |
3700 | ret = 0; | |
3701 | } else { | |
3702 | num_bytes -= block_rsv->reserved; | |
3703 | if (block_rsv->durable && | |
3704 | block_rsv->freed[0] + block_rsv->freed[1] >= num_bytes) | |
3705 | commit_trans = 1; | |
3706 | } | |
3707 | spin_unlock(&block_rsv->lock); | |
3708 | if (!ret) | |
3709 | return 0; | |
3710 | ||
3711 | if (block_rsv->refill_used) { | |
8bb8ab2e JB |
3712 | ret = reserve_metadata_bytes(trans, root, block_rsv, |
3713 | num_bytes, 0); | |
f0486c68 YZ |
3714 | if (!ret) { |
3715 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
3716 | return 0; | |
4e06bdd6 | 3717 | } |
f0486c68 | 3718 | } |
9ed74f2d | 3719 | |
f0486c68 YZ |
3720 | if (commit_trans) { |
3721 | if (trans) | |
3722 | return -EAGAIN; | |
3723 | ||
3724 | trans = btrfs_join_transaction(root, 1); | |
3725 | BUG_ON(IS_ERR(trans)); | |
3726 | ret = btrfs_commit_transaction(trans, root); | |
3727 | return 0; | |
6a63209f | 3728 | } |
9ed74f2d | 3729 | |
f0486c68 YZ |
3730 | WARN_ON(1); |
3731 | printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n", | |
3732 | block_rsv->size, block_rsv->reserved, | |
3733 | block_rsv->freed[0], block_rsv->freed[1]); | |
6a63209f | 3734 | |
f0486c68 YZ |
3735 | return -ENOSPC; |
3736 | } | |
3737 | ||
3738 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
3739 | struct btrfs_block_rsv *dst_rsv, | |
3740 | u64 num_bytes) | |
3741 | { | |
3742 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
3743 | } | |
3744 | ||
3745 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
3746 | struct btrfs_block_rsv *block_rsv, | |
3747 | u64 num_bytes) | |
3748 | { | |
3749 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
3750 | if (global_rsv->full || global_rsv == block_rsv || | |
3751 | block_rsv->space_info != global_rsv->space_info) | |
3752 | global_rsv = NULL; | |
3753 | block_rsv_release_bytes(block_rsv, global_rsv, num_bytes); | |
6a63209f JB |
3754 | } |
3755 | ||
3756 | /* | |
8929ecfa YZ |
3757 | * helper to calculate size of global block reservation. |
3758 | * the desired value is sum of space used by extent tree, | |
3759 | * checksum tree and root tree | |
6a63209f | 3760 | */ |
8929ecfa | 3761 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 3762 | { |
8929ecfa YZ |
3763 | struct btrfs_space_info *sinfo; |
3764 | u64 num_bytes; | |
3765 | u64 meta_used; | |
3766 | u64 data_used; | |
3767 | int csum_size = btrfs_super_csum_size(&fs_info->super_copy); | |
3768 | #if 0 | |
3769 | /* | |
3770 | * per tree used space accounting can be inaccuracy, so we | |
3771 | * can't rely on it. | |
3772 | */ | |
3773 | spin_lock(&fs_info->extent_root->accounting_lock); | |
3774 | num_bytes = btrfs_root_used(&fs_info->extent_root->root_item); | |
3775 | spin_unlock(&fs_info->extent_root->accounting_lock); | |
6a63209f | 3776 | |
8929ecfa YZ |
3777 | spin_lock(&fs_info->csum_root->accounting_lock); |
3778 | num_bytes += btrfs_root_used(&fs_info->csum_root->root_item); | |
3779 | spin_unlock(&fs_info->csum_root->accounting_lock); | |
6a63209f | 3780 | |
8929ecfa YZ |
3781 | spin_lock(&fs_info->tree_root->accounting_lock); |
3782 | num_bytes += btrfs_root_used(&fs_info->tree_root->root_item); | |
3783 | spin_unlock(&fs_info->tree_root->accounting_lock); | |
3784 | #endif | |
3785 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); | |
3786 | spin_lock(&sinfo->lock); | |
3787 | data_used = sinfo->bytes_used; | |
3788 | spin_unlock(&sinfo->lock); | |
33b4d47f | 3789 | |
8929ecfa YZ |
3790 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
3791 | spin_lock(&sinfo->lock); | |
6d48755d JB |
3792 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
3793 | data_used = 0; | |
8929ecfa YZ |
3794 | meta_used = sinfo->bytes_used; |
3795 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 3796 | |
8929ecfa YZ |
3797 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
3798 | csum_size * 2; | |
3799 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 3800 | |
8929ecfa YZ |
3801 | if (num_bytes * 3 > meta_used) |
3802 | num_bytes = div64_u64(meta_used, 3); | |
ab6e2410 | 3803 | |
8929ecfa YZ |
3804 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
3805 | } | |
6a63209f | 3806 | |
8929ecfa YZ |
3807 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
3808 | { | |
3809 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
3810 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
3811 | u64 num_bytes; | |
6a63209f | 3812 | |
8929ecfa | 3813 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 3814 | |
8929ecfa YZ |
3815 | spin_lock(&block_rsv->lock); |
3816 | spin_lock(&sinfo->lock); | |
4e06bdd6 | 3817 | |
8929ecfa | 3818 | block_rsv->size = num_bytes; |
4e06bdd6 | 3819 | |
8929ecfa | 3820 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
3821 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
3822 | sinfo->bytes_may_use; | |
8929ecfa YZ |
3823 | |
3824 | if (sinfo->total_bytes > num_bytes) { | |
3825 | num_bytes = sinfo->total_bytes - num_bytes; | |
3826 | block_rsv->reserved += num_bytes; | |
3827 | sinfo->bytes_reserved += num_bytes; | |
6a63209f | 3828 | } |
6a63209f | 3829 | |
8929ecfa YZ |
3830 | if (block_rsv->reserved >= block_rsv->size) { |
3831 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3832 | sinfo->bytes_reserved -= num_bytes; | |
3833 | block_rsv->reserved = block_rsv->size; | |
3834 | block_rsv->full = 1; | |
3835 | } | |
3836 | #if 0 | |
3837 | printk(KERN_INFO"global block rsv size %llu reserved %llu\n", | |
3838 | block_rsv->size, block_rsv->reserved); | |
3839 | #endif | |
3840 | spin_unlock(&sinfo->lock); | |
3841 | spin_unlock(&block_rsv->lock); | |
6a63209f JB |
3842 | } |
3843 | ||
f0486c68 | 3844 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3845 | { |
f0486c68 | 3846 | struct btrfs_space_info *space_info; |
6a63209f | 3847 | |
f0486c68 YZ |
3848 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
3849 | fs_info->chunk_block_rsv.space_info = space_info; | |
3850 | fs_info->chunk_block_rsv.priority = 10; | |
6a63209f | 3851 | |
f0486c68 | 3852 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa YZ |
3853 | fs_info->global_block_rsv.space_info = space_info; |
3854 | fs_info->global_block_rsv.priority = 10; | |
3855 | fs_info->global_block_rsv.refill_used = 1; | |
3856 | fs_info->delalloc_block_rsv.space_info = space_info; | |
f0486c68 YZ |
3857 | fs_info->trans_block_rsv.space_info = space_info; |
3858 | fs_info->empty_block_rsv.space_info = space_info; | |
3859 | fs_info->empty_block_rsv.priority = 10; | |
3860 | ||
8929ecfa YZ |
3861 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
3862 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
3863 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
3864 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 3865 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa YZ |
3866 | |
3867 | btrfs_add_durable_block_rsv(fs_info, &fs_info->global_block_rsv); | |
3868 | ||
3869 | btrfs_add_durable_block_rsv(fs_info, &fs_info->delalloc_block_rsv); | |
3870 | ||
3871 | update_global_block_rsv(fs_info); | |
6a63209f JB |
3872 | } |
3873 | ||
8929ecfa | 3874 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3875 | { |
8929ecfa YZ |
3876 | block_rsv_release_bytes(&fs_info->global_block_rsv, NULL, (u64)-1); |
3877 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); | |
3878 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
3879 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
3880 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
3881 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
3882 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
f0486c68 | 3883 | } |
6a63209f | 3884 | |
a22285a6 YZ |
3885 | static u64 calc_trans_metadata_size(struct btrfs_root *root, int num_items) |
3886 | { | |
3887 | return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * | |
3888 | 3 * num_items; | |
3889 | } | |
6a63209f | 3890 | |
a22285a6 YZ |
3891 | int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans, |
3892 | struct btrfs_root *root, | |
8bb8ab2e | 3893 | int num_items) |
a22285a6 YZ |
3894 | { |
3895 | u64 num_bytes; | |
3896 | int ret; | |
6a63209f | 3897 | |
a22285a6 YZ |
3898 | if (num_items == 0 || root->fs_info->chunk_root == root) |
3899 | return 0; | |
6a63209f | 3900 | |
a22285a6 YZ |
3901 | num_bytes = calc_trans_metadata_size(root, num_items); |
3902 | ret = btrfs_block_rsv_add(trans, root, &root->fs_info->trans_block_rsv, | |
8bb8ab2e | 3903 | num_bytes); |
a22285a6 YZ |
3904 | if (!ret) { |
3905 | trans->bytes_reserved += num_bytes; | |
3906 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
3907 | } | |
3908 | return ret; | |
6a63209f JB |
3909 | } |
3910 | ||
a22285a6 YZ |
3911 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
3912 | struct btrfs_root *root) | |
6a63209f | 3913 | { |
a22285a6 YZ |
3914 | if (!trans->bytes_reserved) |
3915 | return; | |
6a63209f | 3916 | |
a22285a6 YZ |
3917 | BUG_ON(trans->block_rsv != &root->fs_info->trans_block_rsv); |
3918 | btrfs_block_rsv_release(root, trans->block_rsv, | |
3919 | trans->bytes_reserved); | |
3920 | trans->bytes_reserved = 0; | |
3921 | } | |
6a63209f | 3922 | |
d68fc57b YZ |
3923 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
3924 | struct inode *inode) | |
3925 | { | |
3926 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3927 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3928 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
3929 | ||
3930 | /* | |
3931 | * one for deleting orphan item, one for updating inode and | |
3932 | * two for calling btrfs_truncate_inode_items. | |
3933 | * | |
3934 | * btrfs_truncate_inode_items is a delete operation, it frees | |
3935 | * more space than it uses in most cases. So two units of | |
3936 | * metadata space should be enough for calling it many times. | |
3937 | * If all of the metadata space is used, we can commit | |
3938 | * transaction and use space it freed. | |
3939 | */ | |
3940 | u64 num_bytes = calc_trans_metadata_size(root, 4); | |
3941 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
6a63209f JB |
3942 | } |
3943 | ||
d68fc57b | 3944 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 3945 | { |
d68fc57b YZ |
3946 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3947 | u64 num_bytes = calc_trans_metadata_size(root, 4); | |
3948 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); | |
3949 | } | |
97e728d4 | 3950 | |
a22285a6 YZ |
3951 | int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, |
3952 | struct btrfs_pending_snapshot *pending) | |
3953 | { | |
3954 | struct btrfs_root *root = pending->root; | |
3955 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3956 | struct btrfs_block_rsv *dst_rsv = &pending->block_rsv; | |
3957 | /* | |
3958 | * two for root back/forward refs, two for directory entries | |
3959 | * and one for root of the snapshot. | |
3960 | */ | |
3961 | u64 num_bytes = calc_trans_metadata_size(root, 5); | |
3962 | dst_rsv->space_info = src_rsv->space_info; | |
3963 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
97e728d4 JB |
3964 | } |
3965 | ||
0ca1f7ce | 3966 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes) |
6324fbf3 | 3967 | { |
0ca1f7ce YZ |
3968 | return num_bytes >>= 3; |
3969 | } | |
c146afad | 3970 | |
0ca1f7ce YZ |
3971 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
3972 | { | |
3973 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3974 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
3975 | u64 to_reserve; | |
3976 | int nr_extents; | |
0ca1f7ce | 3977 | int ret; |
6324fbf3 | 3978 | |
0ca1f7ce YZ |
3979 | if (btrfs_transaction_in_commit(root->fs_info)) |
3980 | schedule_timeout(1); | |
ec44a35c | 3981 | |
0ca1f7ce | 3982 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 3983 | |
0ca1f7ce YZ |
3984 | spin_lock(&BTRFS_I(inode)->accounting_lock); |
3985 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents) + 1; | |
3986 | if (nr_extents > BTRFS_I(inode)->reserved_extents) { | |
3987 | nr_extents -= BTRFS_I(inode)->reserved_extents; | |
3988 | to_reserve = calc_trans_metadata_size(root, nr_extents); | |
3989 | } else { | |
3990 | nr_extents = 0; | |
3991 | to_reserve = 0; | |
593060d7 | 3992 | } |
8bb8ab2e | 3993 | spin_unlock(&BTRFS_I(inode)->accounting_lock); |
6324fbf3 | 3994 | |
0ca1f7ce | 3995 | to_reserve += calc_csum_metadata_size(inode, num_bytes); |
8bb8ab2e JB |
3996 | ret = reserve_metadata_bytes(NULL, root, block_rsv, to_reserve, 1); |
3997 | if (ret) | |
0ca1f7ce | 3998 | return ret; |
6324fbf3 | 3999 | |
8bb8ab2e | 4000 | spin_lock(&BTRFS_I(inode)->accounting_lock); |
0ca1f7ce YZ |
4001 | BTRFS_I(inode)->reserved_extents += nr_extents; |
4002 | atomic_inc(&BTRFS_I(inode)->outstanding_extents); | |
4003 | spin_unlock(&BTRFS_I(inode)->accounting_lock); | |
25179201 | 4004 | |
0ca1f7ce YZ |
4005 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4006 | ||
4007 | if (block_rsv->size > 512 * 1024 * 1024) | |
0019f10d | 4008 | shrink_delalloc(NULL, root, to_reserve, 0); |
0ca1f7ce YZ |
4009 | |
4010 | return 0; | |
4011 | } | |
4012 | ||
4013 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) | |
4014 | { | |
4015 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4016 | u64 to_free; | |
4017 | int nr_extents; | |
4018 | ||
4019 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
4020 | atomic_dec(&BTRFS_I(inode)->outstanding_extents); | |
4021 | ||
4022 | spin_lock(&BTRFS_I(inode)->accounting_lock); | |
4023 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents); | |
4024 | if (nr_extents < BTRFS_I(inode)->reserved_extents) { | |
4025 | nr_extents = BTRFS_I(inode)->reserved_extents - nr_extents; | |
4026 | BTRFS_I(inode)->reserved_extents -= nr_extents; | |
4027 | } else { | |
4028 | nr_extents = 0; | |
97e728d4 | 4029 | } |
0ca1f7ce | 4030 | spin_unlock(&BTRFS_I(inode)->accounting_lock); |
97e728d4 | 4031 | |
0ca1f7ce YZ |
4032 | to_free = calc_csum_metadata_size(inode, num_bytes); |
4033 | if (nr_extents > 0) | |
4034 | to_free += calc_trans_metadata_size(root, nr_extents); | |
4035 | ||
4036 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, | |
4037 | to_free); | |
4038 | } | |
4039 | ||
4040 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) | |
4041 | { | |
4042 | int ret; | |
4043 | ||
4044 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 4045 | if (ret) |
0ca1f7ce YZ |
4046 | return ret; |
4047 | ||
4048 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
4049 | if (ret) { | |
4050 | btrfs_free_reserved_data_space(inode, num_bytes); | |
4051 | return ret; | |
4052 | } | |
4053 | ||
4054 | return 0; | |
4055 | } | |
4056 | ||
4057 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) | |
4058 | { | |
4059 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
4060 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
4061 | } |
4062 | ||
9078a3e1 CM |
4063 | static int update_block_group(struct btrfs_trans_handle *trans, |
4064 | struct btrfs_root *root, | |
f0486c68 | 4065 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 4066 | { |
0af3d00b | 4067 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 4068 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 4069 | u64 total = num_bytes; |
9078a3e1 | 4070 | u64 old_val; |
db94535d | 4071 | u64 byte_in_group; |
0af3d00b | 4072 | int factor; |
3e1ad54f | 4073 | |
5d4f98a2 YZ |
4074 | /* block accounting for super block */ |
4075 | spin_lock(&info->delalloc_lock); | |
4076 | old_val = btrfs_super_bytes_used(&info->super_copy); | |
4077 | if (alloc) | |
4078 | old_val += num_bytes; | |
4079 | else | |
4080 | old_val -= num_bytes; | |
4081 | btrfs_set_super_bytes_used(&info->super_copy, old_val); | |
5d4f98a2 YZ |
4082 | spin_unlock(&info->delalloc_lock); |
4083 | ||
d397712b | 4084 | while (total) { |
db94535d | 4085 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 4086 | if (!cache) |
9078a3e1 | 4087 | return -1; |
b742bb82 YZ |
4088 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
4089 | BTRFS_BLOCK_GROUP_RAID1 | | |
4090 | BTRFS_BLOCK_GROUP_RAID10)) | |
4091 | factor = 2; | |
4092 | else | |
4093 | factor = 1; | |
9d66e233 JB |
4094 | /* |
4095 | * If this block group has free space cache written out, we | |
4096 | * need to make sure to load it if we are removing space. This | |
4097 | * is because we need the unpinning stage to actually add the | |
4098 | * space back to the block group, otherwise we will leak space. | |
4099 | */ | |
4100 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
b8399dee | 4101 | cache_block_group(cache, trans, NULL, 1); |
0af3d00b | 4102 | |
db94535d CM |
4103 | byte_in_group = bytenr - cache->key.objectid; |
4104 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 4105 | |
25179201 | 4106 | spin_lock(&cache->space_info->lock); |
c286ac48 | 4107 | spin_lock(&cache->lock); |
0af3d00b JB |
4108 | |
4109 | if (btrfs_super_cache_generation(&info->super_copy) != 0 && | |
4110 | cache->disk_cache_state < BTRFS_DC_CLEAR) | |
4111 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
4112 | ||
0f9dd46c | 4113 | cache->dirty = 1; |
9078a3e1 | 4114 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 4115 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 4116 | if (alloc) { |
db94535d | 4117 | old_val += num_bytes; |
11833d66 YZ |
4118 | btrfs_set_block_group_used(&cache->item, old_val); |
4119 | cache->reserved -= num_bytes; | |
11833d66 | 4120 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
4121 | cache->space_info->bytes_used += num_bytes; |
4122 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 4123 | spin_unlock(&cache->lock); |
25179201 | 4124 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 4125 | } else { |
db94535d | 4126 | old_val -= num_bytes; |
c286ac48 | 4127 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
4128 | cache->pinned += num_bytes; |
4129 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 4130 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 4131 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 4132 | spin_unlock(&cache->lock); |
25179201 | 4133 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 4134 | |
f0486c68 YZ |
4135 | set_extent_dirty(info->pinned_extents, |
4136 | bytenr, bytenr + num_bytes - 1, | |
4137 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 4138 | } |
fa9c0d79 | 4139 | btrfs_put_block_group(cache); |
db94535d CM |
4140 | total -= num_bytes; |
4141 | bytenr += num_bytes; | |
9078a3e1 CM |
4142 | } |
4143 | return 0; | |
4144 | } | |
6324fbf3 | 4145 | |
a061fc8d CM |
4146 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
4147 | { | |
0f9dd46c | 4148 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 4149 | u64 bytenr; |
0f9dd46c JB |
4150 | |
4151 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
4152 | if (!cache) | |
a061fc8d | 4153 | return 0; |
0f9dd46c | 4154 | |
d2fb3437 | 4155 | bytenr = cache->key.objectid; |
fa9c0d79 | 4156 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
4157 | |
4158 | return bytenr; | |
a061fc8d CM |
4159 | } |
4160 | ||
f0486c68 YZ |
4161 | static int pin_down_extent(struct btrfs_root *root, |
4162 | struct btrfs_block_group_cache *cache, | |
4163 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 4164 | { |
11833d66 YZ |
4165 | spin_lock(&cache->space_info->lock); |
4166 | spin_lock(&cache->lock); | |
4167 | cache->pinned += num_bytes; | |
4168 | cache->space_info->bytes_pinned += num_bytes; | |
4169 | if (reserved) { | |
4170 | cache->reserved -= num_bytes; | |
4171 | cache->space_info->bytes_reserved -= num_bytes; | |
4172 | } | |
4173 | spin_unlock(&cache->lock); | |
4174 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 4175 | |
f0486c68 YZ |
4176 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
4177 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
4178 | return 0; | |
4179 | } | |
68b38550 | 4180 | |
f0486c68 YZ |
4181 | /* |
4182 | * this function must be called within transaction | |
4183 | */ | |
4184 | int btrfs_pin_extent(struct btrfs_root *root, | |
4185 | u64 bytenr, u64 num_bytes, int reserved) | |
4186 | { | |
4187 | struct btrfs_block_group_cache *cache; | |
68b38550 | 4188 | |
f0486c68 YZ |
4189 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
4190 | BUG_ON(!cache); | |
4191 | ||
4192 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
4193 | ||
4194 | btrfs_put_block_group(cache); | |
11833d66 YZ |
4195 | return 0; |
4196 | } | |
4197 | ||
f0486c68 YZ |
4198 | /* |
4199 | * update size of reserved extents. this function may return -EAGAIN | |
4200 | * if 'reserve' is true or 'sinfo' is false. | |
4201 | */ | |
4202 | static int update_reserved_bytes(struct btrfs_block_group_cache *cache, | |
4203 | u64 num_bytes, int reserve, int sinfo) | |
11833d66 | 4204 | { |
f0486c68 YZ |
4205 | int ret = 0; |
4206 | if (sinfo) { | |
4207 | struct btrfs_space_info *space_info = cache->space_info; | |
4208 | spin_lock(&space_info->lock); | |
4209 | spin_lock(&cache->lock); | |
4210 | if (reserve) { | |
4211 | if (cache->ro) { | |
4212 | ret = -EAGAIN; | |
4213 | } else { | |
4214 | cache->reserved += num_bytes; | |
4215 | space_info->bytes_reserved += num_bytes; | |
4216 | } | |
4217 | } else { | |
4218 | if (cache->ro) | |
4219 | space_info->bytes_readonly += num_bytes; | |
4220 | cache->reserved -= num_bytes; | |
4221 | space_info->bytes_reserved -= num_bytes; | |
4222 | } | |
4223 | spin_unlock(&cache->lock); | |
4224 | spin_unlock(&space_info->lock); | |
11833d66 | 4225 | } else { |
f0486c68 YZ |
4226 | spin_lock(&cache->lock); |
4227 | if (cache->ro) { | |
4228 | ret = -EAGAIN; | |
4229 | } else { | |
4230 | if (reserve) | |
4231 | cache->reserved += num_bytes; | |
4232 | else | |
4233 | cache->reserved -= num_bytes; | |
4234 | } | |
4235 | spin_unlock(&cache->lock); | |
324ae4df | 4236 | } |
f0486c68 | 4237 | return ret; |
324ae4df | 4238 | } |
9078a3e1 | 4239 | |
11833d66 YZ |
4240 | int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
4241 | struct btrfs_root *root) | |
e8569813 | 4242 | { |
e8569813 | 4243 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
4244 | struct btrfs_caching_control *next; |
4245 | struct btrfs_caching_control *caching_ctl; | |
4246 | struct btrfs_block_group_cache *cache; | |
e8569813 | 4247 | |
11833d66 | 4248 | down_write(&fs_info->extent_commit_sem); |
25179201 | 4249 | |
11833d66 YZ |
4250 | list_for_each_entry_safe(caching_ctl, next, |
4251 | &fs_info->caching_block_groups, list) { | |
4252 | cache = caching_ctl->block_group; | |
4253 | if (block_group_cache_done(cache)) { | |
4254 | cache->last_byte_to_unpin = (u64)-1; | |
4255 | list_del_init(&caching_ctl->list); | |
4256 | put_caching_control(caching_ctl); | |
e8569813 | 4257 | } else { |
11833d66 | 4258 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 4259 | } |
e8569813 | 4260 | } |
11833d66 YZ |
4261 | |
4262 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
4263 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
4264 | else | |
4265 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
4266 | ||
4267 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
4268 | |
4269 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
4270 | return 0; |
4271 | } | |
4272 | ||
11833d66 | 4273 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 4274 | { |
11833d66 YZ |
4275 | struct btrfs_fs_info *fs_info = root->fs_info; |
4276 | struct btrfs_block_group_cache *cache = NULL; | |
4277 | u64 len; | |
ccd467d6 | 4278 | |
11833d66 YZ |
4279 | while (start <= end) { |
4280 | if (!cache || | |
4281 | start >= cache->key.objectid + cache->key.offset) { | |
4282 | if (cache) | |
4283 | btrfs_put_block_group(cache); | |
4284 | cache = btrfs_lookup_block_group(fs_info, start); | |
4285 | BUG_ON(!cache); | |
4286 | } | |
4287 | ||
4288 | len = cache->key.objectid + cache->key.offset - start; | |
4289 | len = min(len, end + 1 - start); | |
4290 | ||
4291 | if (start < cache->last_byte_to_unpin) { | |
4292 | len = min(len, cache->last_byte_to_unpin - start); | |
4293 | btrfs_add_free_space(cache, start, len); | |
4294 | } | |
4295 | ||
f0486c68 YZ |
4296 | start += len; |
4297 | ||
11833d66 YZ |
4298 | spin_lock(&cache->space_info->lock); |
4299 | spin_lock(&cache->lock); | |
4300 | cache->pinned -= len; | |
4301 | cache->space_info->bytes_pinned -= len; | |
f0486c68 YZ |
4302 | if (cache->ro) { |
4303 | cache->space_info->bytes_readonly += len; | |
4304 | } else if (cache->reserved_pinned > 0) { | |
4305 | len = min(len, cache->reserved_pinned); | |
4306 | cache->reserved_pinned -= len; | |
4307 | cache->space_info->bytes_reserved += len; | |
4308 | } | |
11833d66 YZ |
4309 | spin_unlock(&cache->lock); |
4310 | spin_unlock(&cache->space_info->lock); | |
ccd467d6 | 4311 | } |
11833d66 YZ |
4312 | |
4313 | if (cache) | |
4314 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
4315 | return 0; |
4316 | } | |
4317 | ||
4318 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 4319 | struct btrfs_root *root) |
a28ec197 | 4320 | { |
11833d66 YZ |
4321 | struct btrfs_fs_info *fs_info = root->fs_info; |
4322 | struct extent_io_tree *unpin; | |
f0486c68 YZ |
4323 | struct btrfs_block_rsv *block_rsv; |
4324 | struct btrfs_block_rsv *next_rsv; | |
1a5bc167 CM |
4325 | u64 start; |
4326 | u64 end; | |
f0486c68 | 4327 | int idx; |
a28ec197 | 4328 | int ret; |
a28ec197 | 4329 | |
11833d66 YZ |
4330 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
4331 | unpin = &fs_info->freed_extents[1]; | |
4332 | else | |
4333 | unpin = &fs_info->freed_extents[0]; | |
4334 | ||
d397712b | 4335 | while (1) { |
1a5bc167 CM |
4336 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
4337 | EXTENT_DIRTY); | |
4338 | if (ret) | |
a28ec197 | 4339 | break; |
1f3c79a2 LH |
4340 | |
4341 | ret = btrfs_discard_extent(root, start, end + 1 - start); | |
4342 | ||
1a5bc167 | 4343 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 4344 | unpin_extent_range(root, start, end); |
b9473439 | 4345 | cond_resched(); |
a28ec197 | 4346 | } |
817d52f8 | 4347 | |
f0486c68 YZ |
4348 | mutex_lock(&fs_info->durable_block_rsv_mutex); |
4349 | list_for_each_entry_safe(block_rsv, next_rsv, | |
4350 | &fs_info->durable_block_rsv_list, list) { | |
444528b3 | 4351 | |
f0486c68 YZ |
4352 | idx = trans->transid & 0x1; |
4353 | if (block_rsv->freed[idx] > 0) { | |
4354 | block_rsv_add_bytes(block_rsv, | |
4355 | block_rsv->freed[idx], 0); | |
4356 | block_rsv->freed[idx] = 0; | |
4357 | } | |
4358 | if (atomic_read(&block_rsv->usage) == 0) { | |
4359 | btrfs_block_rsv_release(root, block_rsv, (u64)-1); | |
31840ae1 | 4360 | |
f0486c68 YZ |
4361 | if (block_rsv->freed[0] == 0 && |
4362 | block_rsv->freed[1] == 0) { | |
4363 | list_del_init(&block_rsv->list); | |
4364 | kfree(block_rsv); | |
4365 | } | |
4366 | } else { | |
4367 | btrfs_block_rsv_release(root, block_rsv, 0); | |
8ef97622 | 4368 | } |
f4b9aa8d | 4369 | } |
f0486c68 | 4370 | mutex_unlock(&fs_info->durable_block_rsv_mutex); |
31840ae1 | 4371 | |
e20d96d6 CM |
4372 | return 0; |
4373 | } | |
4374 | ||
5d4f98a2 YZ |
4375 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
4376 | struct btrfs_root *root, | |
4377 | u64 bytenr, u64 num_bytes, u64 parent, | |
4378 | u64 root_objectid, u64 owner_objectid, | |
4379 | u64 owner_offset, int refs_to_drop, | |
4380 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 4381 | { |
e2fa7227 | 4382 | struct btrfs_key key; |
5d4f98a2 | 4383 | struct btrfs_path *path; |
1261ec42 CM |
4384 | struct btrfs_fs_info *info = root->fs_info; |
4385 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 4386 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
4387 | struct btrfs_extent_item *ei; |
4388 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 4389 | int ret; |
5d4f98a2 | 4390 | int is_data; |
952fccac CM |
4391 | int extent_slot = 0; |
4392 | int found_extent = 0; | |
4393 | int num_to_del = 1; | |
5d4f98a2 YZ |
4394 | u32 item_size; |
4395 | u64 refs; | |
037e6390 | 4396 | |
5caf2a00 | 4397 | path = btrfs_alloc_path(); |
54aa1f4d CM |
4398 | if (!path) |
4399 | return -ENOMEM; | |
5f26f772 | 4400 | |
3c12ac72 | 4401 | path->reada = 1; |
b9473439 | 4402 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4403 | |
4404 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
4405 | BUG_ON(!is_data && refs_to_drop != 1); | |
4406 | ||
4407 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
4408 | bytenr, num_bytes, parent, | |
4409 | root_objectid, owner_objectid, | |
4410 | owner_offset); | |
7bb86316 | 4411 | if (ret == 0) { |
952fccac | 4412 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
4413 | while (extent_slot >= 0) { |
4414 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 4415 | extent_slot); |
5d4f98a2 | 4416 | if (key.objectid != bytenr) |
952fccac | 4417 | break; |
5d4f98a2 YZ |
4418 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
4419 | key.offset == num_bytes) { | |
952fccac CM |
4420 | found_extent = 1; |
4421 | break; | |
4422 | } | |
4423 | if (path->slots[0] - extent_slot > 5) | |
4424 | break; | |
5d4f98a2 | 4425 | extent_slot--; |
952fccac | 4426 | } |
5d4f98a2 YZ |
4427 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
4428 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
4429 | if (found_extent && item_size < sizeof(*ei)) | |
4430 | found_extent = 0; | |
4431 | #endif | |
31840ae1 | 4432 | if (!found_extent) { |
5d4f98a2 | 4433 | BUG_ON(iref); |
56bec294 | 4434 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
4435 | NULL, refs_to_drop, |
4436 | is_data); | |
31840ae1 ZY |
4437 | BUG_ON(ret); |
4438 | btrfs_release_path(extent_root, path); | |
b9473439 | 4439 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4440 | |
4441 | key.objectid = bytenr; | |
4442 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4443 | key.offset = num_bytes; | |
4444 | ||
31840ae1 ZY |
4445 | ret = btrfs_search_slot(trans, extent_root, |
4446 | &key, path, -1, 1); | |
f3465ca4 JB |
4447 | if (ret) { |
4448 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
4449 | ", was looking for %llu\n", ret, |
4450 | (unsigned long long)bytenr); | |
f3465ca4 JB |
4451 | btrfs_print_leaf(extent_root, path->nodes[0]); |
4452 | } | |
31840ae1 ZY |
4453 | BUG_ON(ret); |
4454 | extent_slot = path->slots[0]; | |
4455 | } | |
7bb86316 CM |
4456 | } else { |
4457 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4458 | WARN_ON(1); | |
d397712b | 4459 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 4460 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 4461 | (unsigned long long)bytenr, |
56bec294 | 4462 | (unsigned long long)parent, |
d397712b | 4463 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
4464 | (unsigned long long)owner_objectid, |
4465 | (unsigned long long)owner_offset); | |
7bb86316 | 4466 | } |
5f39d397 CM |
4467 | |
4468 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
4469 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
4470 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
4471 | if (item_size < sizeof(*ei)) { | |
4472 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
4473 | ret = convert_extent_item_v0(trans, extent_root, path, | |
4474 | owner_objectid, 0); | |
4475 | BUG_ON(ret < 0); | |
4476 | ||
4477 | btrfs_release_path(extent_root, path); | |
4478 | path->leave_spinning = 1; | |
4479 | ||
4480 | key.objectid = bytenr; | |
4481 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4482 | key.offset = num_bytes; | |
4483 | ||
4484 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
4485 | -1, 1); | |
4486 | if (ret) { | |
4487 | printk(KERN_ERR "umm, got %d back from search" | |
4488 | ", was looking for %llu\n", ret, | |
4489 | (unsigned long long)bytenr); | |
4490 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4491 | } | |
4492 | BUG_ON(ret); | |
4493 | extent_slot = path->slots[0]; | |
4494 | leaf = path->nodes[0]; | |
4495 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
4496 | } | |
4497 | #endif | |
4498 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 4499 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 4500 | struct btrfs_extent_item); |
5d4f98a2 YZ |
4501 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
4502 | struct btrfs_tree_block_info *bi; | |
4503 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
4504 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
4505 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
4506 | } | |
56bec294 | 4507 | |
5d4f98a2 | 4508 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
4509 | BUG_ON(refs < refs_to_drop); |
4510 | refs -= refs_to_drop; | |
5f39d397 | 4511 | |
5d4f98a2 YZ |
4512 | if (refs > 0) { |
4513 | if (extent_op) | |
4514 | __run_delayed_extent_op(extent_op, leaf, ei); | |
4515 | /* | |
4516 | * In the case of inline back ref, reference count will | |
4517 | * be updated by remove_extent_backref | |
952fccac | 4518 | */ |
5d4f98a2 YZ |
4519 | if (iref) { |
4520 | BUG_ON(!found_extent); | |
4521 | } else { | |
4522 | btrfs_set_extent_refs(leaf, ei, refs); | |
4523 | btrfs_mark_buffer_dirty(leaf); | |
4524 | } | |
4525 | if (found_extent) { | |
4526 | ret = remove_extent_backref(trans, extent_root, path, | |
4527 | iref, refs_to_drop, | |
4528 | is_data); | |
952fccac CM |
4529 | BUG_ON(ret); |
4530 | } | |
5d4f98a2 | 4531 | } else { |
5d4f98a2 YZ |
4532 | if (found_extent) { |
4533 | BUG_ON(is_data && refs_to_drop != | |
4534 | extent_data_ref_count(root, path, iref)); | |
4535 | if (iref) { | |
4536 | BUG_ON(path->slots[0] != extent_slot); | |
4537 | } else { | |
4538 | BUG_ON(path->slots[0] != extent_slot + 1); | |
4539 | path->slots[0] = extent_slot; | |
4540 | num_to_del = 2; | |
4541 | } | |
78fae27e | 4542 | } |
b9473439 | 4543 | |
952fccac CM |
4544 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
4545 | num_to_del); | |
31840ae1 | 4546 | BUG_ON(ret); |
25179201 | 4547 | btrfs_release_path(extent_root, path); |
21af804c | 4548 | |
5d4f98a2 | 4549 | if (is_data) { |
459931ec CM |
4550 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
4551 | BUG_ON(ret); | |
d57e62b8 CM |
4552 | } else { |
4553 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
4554 | bytenr >> PAGE_CACHE_SHIFT, | |
4555 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
4556 | } |
4557 | ||
f0486c68 | 4558 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
dcbdd4dc | 4559 | BUG_ON(ret); |
a28ec197 | 4560 | } |
5caf2a00 | 4561 | btrfs_free_path(path); |
a28ec197 CM |
4562 | return ret; |
4563 | } | |
4564 | ||
1887be66 | 4565 | /* |
f0486c68 | 4566 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
4567 | * delayed ref for that extent as well. This searches the delayed ref tree for |
4568 | * a given extent, and if there are no other delayed refs to be processed, it | |
4569 | * removes it from the tree. | |
4570 | */ | |
4571 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
4572 | struct btrfs_root *root, u64 bytenr) | |
4573 | { | |
4574 | struct btrfs_delayed_ref_head *head; | |
4575 | struct btrfs_delayed_ref_root *delayed_refs; | |
4576 | struct btrfs_delayed_ref_node *ref; | |
4577 | struct rb_node *node; | |
f0486c68 | 4578 | int ret = 0; |
1887be66 CM |
4579 | |
4580 | delayed_refs = &trans->transaction->delayed_refs; | |
4581 | spin_lock(&delayed_refs->lock); | |
4582 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
4583 | if (!head) | |
4584 | goto out; | |
4585 | ||
4586 | node = rb_prev(&head->node.rb_node); | |
4587 | if (!node) | |
4588 | goto out; | |
4589 | ||
4590 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
4591 | ||
4592 | /* there are still entries for this ref, we can't drop it */ | |
4593 | if (ref->bytenr == bytenr) | |
4594 | goto out; | |
4595 | ||
5d4f98a2 YZ |
4596 | if (head->extent_op) { |
4597 | if (!head->must_insert_reserved) | |
4598 | goto out; | |
4599 | kfree(head->extent_op); | |
4600 | head->extent_op = NULL; | |
4601 | } | |
4602 | ||
1887be66 CM |
4603 | /* |
4604 | * waiting for the lock here would deadlock. If someone else has it | |
4605 | * locked they are already in the process of dropping it anyway | |
4606 | */ | |
4607 | if (!mutex_trylock(&head->mutex)) | |
4608 | goto out; | |
4609 | ||
4610 | /* | |
4611 | * at this point we have a head with no other entries. Go | |
4612 | * ahead and process it. | |
4613 | */ | |
4614 | head->node.in_tree = 0; | |
4615 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 4616 | |
1887be66 CM |
4617 | delayed_refs->num_entries--; |
4618 | ||
4619 | /* | |
4620 | * we don't take a ref on the node because we're removing it from the | |
4621 | * tree, so we just steal the ref the tree was holding. | |
4622 | */ | |
c3e69d58 CM |
4623 | delayed_refs->num_heads--; |
4624 | if (list_empty(&head->cluster)) | |
4625 | delayed_refs->num_heads_ready--; | |
4626 | ||
4627 | list_del_init(&head->cluster); | |
1887be66 CM |
4628 | spin_unlock(&delayed_refs->lock); |
4629 | ||
f0486c68 YZ |
4630 | BUG_ON(head->extent_op); |
4631 | if (head->must_insert_reserved) | |
4632 | ret = 1; | |
4633 | ||
4634 | mutex_unlock(&head->mutex); | |
1887be66 | 4635 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 4636 | return ret; |
1887be66 CM |
4637 | out: |
4638 | spin_unlock(&delayed_refs->lock); | |
4639 | return 0; | |
4640 | } | |
4641 | ||
f0486c68 YZ |
4642 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
4643 | struct btrfs_root *root, | |
4644 | struct extent_buffer *buf, | |
4645 | u64 parent, int last_ref) | |
4646 | { | |
4647 | struct btrfs_block_rsv *block_rsv; | |
4648 | struct btrfs_block_group_cache *cache = NULL; | |
4649 | int ret; | |
4650 | ||
4651 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4652 | ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, | |
4653 | parent, root->root_key.objectid, | |
4654 | btrfs_header_level(buf), | |
4655 | BTRFS_DROP_DELAYED_REF, NULL); | |
4656 | BUG_ON(ret); | |
4657 | } | |
4658 | ||
4659 | if (!last_ref) | |
4660 | return; | |
4661 | ||
4662 | block_rsv = get_block_rsv(trans, root); | |
4663 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); | |
3bf84a5a YZ |
4664 | if (block_rsv->space_info != cache->space_info) |
4665 | goto out; | |
f0486c68 YZ |
4666 | |
4667 | if (btrfs_header_generation(buf) == trans->transid) { | |
4668 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4669 | ret = check_ref_cleanup(trans, root, buf->start); | |
4670 | if (!ret) | |
4671 | goto pin; | |
4672 | } | |
4673 | ||
4674 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
4675 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
4676 | goto pin; | |
4677 | } | |
4678 | ||
4679 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
4680 | ||
4681 | btrfs_add_free_space(cache, buf->start, buf->len); | |
4682 | ret = update_reserved_bytes(cache, buf->len, 0, 0); | |
4683 | if (ret == -EAGAIN) { | |
4684 | /* block group became read-only */ | |
4685 | update_reserved_bytes(cache, buf->len, 0, 1); | |
4686 | goto out; | |
4687 | } | |
4688 | ||
4689 | ret = 1; | |
4690 | spin_lock(&block_rsv->lock); | |
4691 | if (block_rsv->reserved < block_rsv->size) { | |
4692 | block_rsv->reserved += buf->len; | |
4693 | ret = 0; | |
4694 | } | |
4695 | spin_unlock(&block_rsv->lock); | |
4696 | ||
4697 | if (ret) { | |
4698 | spin_lock(&cache->space_info->lock); | |
4699 | cache->space_info->bytes_reserved -= buf->len; | |
4700 | spin_unlock(&cache->space_info->lock); | |
4701 | } | |
4702 | goto out; | |
4703 | } | |
4704 | pin: | |
4705 | if (block_rsv->durable && !cache->ro) { | |
4706 | ret = 0; | |
4707 | spin_lock(&cache->lock); | |
4708 | if (!cache->ro) { | |
4709 | cache->reserved_pinned += buf->len; | |
4710 | ret = 1; | |
4711 | } | |
4712 | spin_unlock(&cache->lock); | |
4713 | ||
4714 | if (ret) { | |
4715 | spin_lock(&block_rsv->lock); | |
4716 | block_rsv->freed[trans->transid & 0x1] += buf->len; | |
4717 | spin_unlock(&block_rsv->lock); | |
4718 | } | |
4719 | } | |
4720 | out: | |
4721 | btrfs_put_block_group(cache); | |
4722 | } | |
4723 | ||
925baedd | 4724 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
4725 | struct btrfs_root *root, |
4726 | u64 bytenr, u64 num_bytes, u64 parent, | |
5d4f98a2 | 4727 | u64 root_objectid, u64 owner, u64 offset) |
925baedd CM |
4728 | { |
4729 | int ret; | |
4730 | ||
56bec294 CM |
4731 | /* |
4732 | * tree log blocks never actually go into the extent allocation | |
4733 | * tree, just update pinning info and exit early. | |
56bec294 | 4734 | */ |
5d4f98a2 YZ |
4735 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
4736 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 4737 | /* unlocks the pinned mutex */ |
11833d66 | 4738 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 4739 | ret = 0; |
5d4f98a2 YZ |
4740 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
4741 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
4742 | parent, root_objectid, (int)owner, | |
4743 | BTRFS_DROP_DELAYED_REF, NULL); | |
1887be66 | 4744 | BUG_ON(ret); |
5d4f98a2 YZ |
4745 | } else { |
4746 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
4747 | parent, root_objectid, owner, | |
4748 | offset, BTRFS_DROP_DELAYED_REF, NULL); | |
4749 | BUG_ON(ret); | |
56bec294 | 4750 | } |
925baedd CM |
4751 | return ret; |
4752 | } | |
4753 | ||
87ee04eb CM |
4754 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
4755 | { | |
4756 | u64 mask = ((u64)root->stripesize - 1); | |
4757 | u64 ret = (val + mask) & ~mask; | |
4758 | return ret; | |
4759 | } | |
4760 | ||
817d52f8 JB |
4761 | /* |
4762 | * when we wait for progress in the block group caching, its because | |
4763 | * our allocation attempt failed at least once. So, we must sleep | |
4764 | * and let some progress happen before we try again. | |
4765 | * | |
4766 | * This function will sleep at least once waiting for new free space to | |
4767 | * show up, and then it will check the block group free space numbers | |
4768 | * for our min num_bytes. Another option is to have it go ahead | |
4769 | * and look in the rbtree for a free extent of a given size, but this | |
4770 | * is a good start. | |
4771 | */ | |
4772 | static noinline int | |
4773 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
4774 | u64 num_bytes) | |
4775 | { | |
11833d66 | 4776 | struct btrfs_caching_control *caching_ctl; |
817d52f8 JB |
4777 | DEFINE_WAIT(wait); |
4778 | ||
11833d66 YZ |
4779 | caching_ctl = get_caching_control(cache); |
4780 | if (!caching_ctl) | |
817d52f8 | 4781 | return 0; |
817d52f8 | 4782 | |
11833d66 | 4783 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
817d52f8 | 4784 | (cache->free_space >= num_bytes)); |
11833d66 YZ |
4785 | |
4786 | put_caching_control(caching_ctl); | |
4787 | return 0; | |
4788 | } | |
4789 | ||
4790 | static noinline int | |
4791 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
4792 | { | |
4793 | struct btrfs_caching_control *caching_ctl; | |
4794 | DEFINE_WAIT(wait); | |
4795 | ||
4796 | caching_ctl = get_caching_control(cache); | |
4797 | if (!caching_ctl) | |
4798 | return 0; | |
4799 | ||
4800 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
4801 | ||
4802 | put_caching_control(caching_ctl); | |
817d52f8 JB |
4803 | return 0; |
4804 | } | |
4805 | ||
b742bb82 YZ |
4806 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
4807 | { | |
4808 | int index; | |
4809 | if (cache->flags & BTRFS_BLOCK_GROUP_RAID10) | |
4810 | index = 0; | |
4811 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1) | |
4812 | index = 1; | |
4813 | else if (cache->flags & BTRFS_BLOCK_GROUP_DUP) | |
4814 | index = 2; | |
4815 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) | |
4816 | index = 3; | |
4817 | else | |
4818 | index = 4; | |
4819 | return index; | |
4820 | } | |
4821 | ||
817d52f8 | 4822 | enum btrfs_loop_type { |
ccf0e725 | 4823 | LOOP_FIND_IDEAL = 0, |
817d52f8 JB |
4824 | LOOP_CACHING_NOWAIT = 1, |
4825 | LOOP_CACHING_WAIT = 2, | |
4826 | LOOP_ALLOC_CHUNK = 3, | |
4827 | LOOP_NO_EMPTY_SIZE = 4, | |
4828 | }; | |
4829 | ||
fec577fb CM |
4830 | /* |
4831 | * walks the btree of allocated extents and find a hole of a given size. | |
4832 | * The key ins is changed to record the hole: | |
4833 | * ins->objectid == block start | |
62e2749e | 4834 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
4835 | * ins->offset == number of blocks |
4836 | * Any available blocks before search_start are skipped. | |
4837 | */ | |
d397712b | 4838 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
4839 | struct btrfs_root *orig_root, |
4840 | u64 num_bytes, u64 empty_size, | |
4841 | u64 search_start, u64 search_end, | |
4842 | u64 hint_byte, struct btrfs_key *ins, | |
98ed5174 | 4843 | int data) |
fec577fb | 4844 | { |
80eb234a | 4845 | int ret = 0; |
d397712b | 4846 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 4847 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 4848 | struct btrfs_block_group_cache *block_group = NULL; |
239b14b3 | 4849 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 4850 | int allowed_chunk_alloc = 0; |
ccf0e725 | 4851 | int done_chunk_alloc = 0; |
80eb234a | 4852 | struct btrfs_space_info *space_info; |
fa9c0d79 CM |
4853 | int last_ptr_loop = 0; |
4854 | int loop = 0; | |
f0486c68 | 4855 | int index = 0; |
817d52f8 | 4856 | bool found_uncached_bg = false; |
0a24325e | 4857 | bool failed_cluster_refill = false; |
1cdda9b8 | 4858 | bool failed_alloc = false; |
67377734 | 4859 | bool use_cluster = true; |
ccf0e725 JB |
4860 | u64 ideal_cache_percent = 0; |
4861 | u64 ideal_cache_offset = 0; | |
fec577fb | 4862 | |
db94535d | 4863 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 4864 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
4865 | ins->objectid = 0; |
4866 | ins->offset = 0; | |
b1a4d965 | 4867 | |
2552d17e | 4868 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 JB |
4869 | if (!space_info) { |
4870 | printk(KERN_ERR "No space info for %d\n", data); | |
4871 | return -ENOSPC; | |
4872 | } | |
2552d17e | 4873 | |
67377734 JB |
4874 | /* |
4875 | * If the space info is for both data and metadata it means we have a | |
4876 | * small filesystem and we can't use the clustering stuff. | |
4877 | */ | |
4878 | if (btrfs_mixed_space_info(space_info)) | |
4879 | use_cluster = false; | |
4880 | ||
0ef3e66b CM |
4881 | if (orig_root->ref_cows || empty_size) |
4882 | allowed_chunk_alloc = 1; | |
4883 | ||
67377734 | 4884 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 4885 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
4886 | if (!btrfs_test_opt(root, SSD)) |
4887 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
4888 | } |
4889 | ||
67377734 JB |
4890 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
4891 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
4892 | last_ptr = &root->fs_info->data_alloc_cluster; |
4893 | } | |
0f9dd46c | 4894 | |
239b14b3 | 4895 | if (last_ptr) { |
fa9c0d79 CM |
4896 | spin_lock(&last_ptr->lock); |
4897 | if (last_ptr->block_group) | |
4898 | hint_byte = last_ptr->window_start; | |
4899 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 4900 | } |
fa9c0d79 | 4901 | |
a061fc8d | 4902 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 4903 | search_start = max(search_start, hint_byte); |
0b86a832 | 4904 | |
817d52f8 | 4905 | if (!last_ptr) |
fa9c0d79 | 4906 | empty_cluster = 0; |
fa9c0d79 | 4907 | |
2552d17e | 4908 | if (search_start == hint_byte) { |
ccf0e725 | 4909 | ideal_cache: |
2552d17e JB |
4910 | block_group = btrfs_lookup_block_group(root->fs_info, |
4911 | search_start); | |
817d52f8 JB |
4912 | /* |
4913 | * we don't want to use the block group if it doesn't match our | |
4914 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
4915 | * |
4916 | * However if we are re-searching with an ideal block group | |
4917 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
4918 | */ |
4919 | if (block_group && block_group_bits(block_group, data) && | |
ccf0e725 JB |
4920 | (block_group->cached != BTRFS_CACHE_NO || |
4921 | search_start == ideal_cache_offset)) { | |
2552d17e | 4922 | down_read(&space_info->groups_sem); |
44fb5511 CM |
4923 | if (list_empty(&block_group->list) || |
4924 | block_group->ro) { | |
4925 | /* | |
4926 | * someone is removing this block group, | |
4927 | * we can't jump into the have_block_group | |
4928 | * target because our list pointers are not | |
4929 | * valid | |
4930 | */ | |
4931 | btrfs_put_block_group(block_group); | |
4932 | up_read(&space_info->groups_sem); | |
ccf0e725 | 4933 | } else { |
b742bb82 | 4934 | index = get_block_group_index(block_group); |
44fb5511 | 4935 | goto have_block_group; |
ccf0e725 | 4936 | } |
2552d17e | 4937 | } else if (block_group) { |
fa9c0d79 | 4938 | btrfs_put_block_group(block_group); |
2552d17e | 4939 | } |
42e70e7a | 4940 | } |
2552d17e | 4941 | search: |
80eb234a | 4942 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
4943 | list_for_each_entry(block_group, &space_info->block_groups[index], |
4944 | list) { | |
6226cb0a | 4945 | u64 offset; |
817d52f8 | 4946 | int cached; |
8a1413a2 | 4947 | |
11dfe35a | 4948 | btrfs_get_block_group(block_group); |
2552d17e | 4949 | search_start = block_group->key.objectid; |
42e70e7a | 4950 | |
83a50de9 CM |
4951 | /* |
4952 | * this can happen if we end up cycling through all the | |
4953 | * raid types, but we want to make sure we only allocate | |
4954 | * for the proper type. | |
4955 | */ | |
4956 | if (!block_group_bits(block_group, data)) { | |
4957 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
4958 | BTRFS_BLOCK_GROUP_RAID1 | | |
4959 | BTRFS_BLOCK_GROUP_RAID10; | |
4960 | ||
4961 | /* | |
4962 | * if they asked for extra copies and this block group | |
4963 | * doesn't provide them, bail. This does allow us to | |
4964 | * fill raid0 from raid1. | |
4965 | */ | |
4966 | if ((data & extra) && !(block_group->flags & extra)) | |
4967 | goto loop; | |
4968 | } | |
4969 | ||
2552d17e | 4970 | have_block_group: |
817d52f8 | 4971 | if (unlikely(block_group->cached == BTRFS_CACHE_NO)) { |
ccf0e725 JB |
4972 | u64 free_percent; |
4973 | ||
b8399dee JB |
4974 | ret = cache_block_group(block_group, trans, |
4975 | orig_root, 1); | |
9d66e233 JB |
4976 | if (block_group->cached == BTRFS_CACHE_FINISHED) |
4977 | goto have_block_group; | |
4978 | ||
ccf0e725 JB |
4979 | free_percent = btrfs_block_group_used(&block_group->item); |
4980 | free_percent *= 100; | |
4981 | free_percent = div64_u64(free_percent, | |
4982 | block_group->key.offset); | |
4983 | free_percent = 100 - free_percent; | |
4984 | if (free_percent > ideal_cache_percent && | |
4985 | likely(!block_group->ro)) { | |
4986 | ideal_cache_offset = block_group->key.objectid; | |
4987 | ideal_cache_percent = free_percent; | |
4988 | } | |
4989 | ||
817d52f8 | 4990 | /* |
ccf0e725 JB |
4991 | * We only want to start kthread caching if we are at |
4992 | * the point where we will wait for caching to make | |
4993 | * progress, or if our ideal search is over and we've | |
4994 | * found somebody to start caching. | |
817d52f8 JB |
4995 | */ |
4996 | if (loop > LOOP_CACHING_NOWAIT || | |
ccf0e725 JB |
4997 | (loop > LOOP_FIND_IDEAL && |
4998 | atomic_read(&space_info->caching_threads) < 2)) { | |
b8399dee JB |
4999 | ret = cache_block_group(block_group, trans, |
5000 | orig_root, 0); | |
817d52f8 | 5001 | BUG_ON(ret); |
2552d17e | 5002 | } |
817d52f8 JB |
5003 | found_uncached_bg = true; |
5004 | ||
ccf0e725 JB |
5005 | /* |
5006 | * If loop is set for cached only, try the next block | |
5007 | * group. | |
5008 | */ | |
5009 | if (loop == LOOP_FIND_IDEAL) | |
817d52f8 JB |
5010 | goto loop; |
5011 | } | |
5012 | ||
ccf0e725 JB |
5013 | cached = block_group_cache_done(block_group); |
5014 | if (unlikely(!cached)) | |
5015 | found_uncached_bg = true; | |
5016 | ||
ea6a478e | 5017 | if (unlikely(block_group->ro)) |
2552d17e | 5018 | goto loop; |
0f9dd46c | 5019 | |
0a24325e JB |
5020 | /* |
5021 | * Ok we want to try and use the cluster allocator, so lets look | |
5022 | * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will | |
5023 | * have tried the cluster allocator plenty of times at this | |
5024 | * point and not have found anything, so we are likely way too | |
5025 | * fragmented for the clustering stuff to find anything, so lets | |
5026 | * just skip it and let the allocator find whatever block it can | |
5027 | * find | |
5028 | */ | |
5029 | if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) { | |
fa9c0d79 CM |
5030 | /* |
5031 | * the refill lock keeps out other | |
5032 | * people trying to start a new cluster | |
5033 | */ | |
5034 | spin_lock(&last_ptr->refill_lock); | |
44fb5511 CM |
5035 | if (last_ptr->block_group && |
5036 | (last_ptr->block_group->ro || | |
5037 | !block_group_bits(last_ptr->block_group, data))) { | |
5038 | offset = 0; | |
5039 | goto refill_cluster; | |
5040 | } | |
5041 | ||
fa9c0d79 CM |
5042 | offset = btrfs_alloc_from_cluster(block_group, last_ptr, |
5043 | num_bytes, search_start); | |
5044 | if (offset) { | |
5045 | /* we have a block, we're done */ | |
5046 | spin_unlock(&last_ptr->refill_lock); | |
5047 | goto checks; | |
5048 | } | |
5049 | ||
5050 | spin_lock(&last_ptr->lock); | |
5051 | /* | |
5052 | * whoops, this cluster doesn't actually point to | |
5053 | * this block group. Get a ref on the block | |
5054 | * group is does point to and try again | |
5055 | */ | |
5056 | if (!last_ptr_loop && last_ptr->block_group && | |
5057 | last_ptr->block_group != block_group) { | |
5058 | ||
5059 | btrfs_put_block_group(block_group); | |
5060 | block_group = last_ptr->block_group; | |
11dfe35a | 5061 | btrfs_get_block_group(block_group); |
fa9c0d79 CM |
5062 | spin_unlock(&last_ptr->lock); |
5063 | spin_unlock(&last_ptr->refill_lock); | |
5064 | ||
5065 | last_ptr_loop = 1; | |
5066 | search_start = block_group->key.objectid; | |
44fb5511 CM |
5067 | /* |
5068 | * we know this block group is properly | |
5069 | * in the list because | |
5070 | * btrfs_remove_block_group, drops the | |
5071 | * cluster before it removes the block | |
5072 | * group from the list | |
5073 | */ | |
fa9c0d79 CM |
5074 | goto have_block_group; |
5075 | } | |
5076 | spin_unlock(&last_ptr->lock); | |
44fb5511 | 5077 | refill_cluster: |
fa9c0d79 CM |
5078 | /* |
5079 | * this cluster didn't work out, free it and | |
5080 | * start over | |
5081 | */ | |
5082 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
5083 | ||
5084 | last_ptr_loop = 0; | |
5085 | ||
5086 | /* allocate a cluster in this block group */ | |
451d7585 | 5087 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 CM |
5088 | block_group, last_ptr, |
5089 | offset, num_bytes, | |
5090 | empty_cluster + empty_size); | |
5091 | if (ret == 0) { | |
5092 | /* | |
5093 | * now pull our allocation out of this | |
5094 | * cluster | |
5095 | */ | |
5096 | offset = btrfs_alloc_from_cluster(block_group, | |
5097 | last_ptr, num_bytes, | |
5098 | search_start); | |
5099 | if (offset) { | |
5100 | /* we found one, proceed */ | |
5101 | spin_unlock(&last_ptr->refill_lock); | |
5102 | goto checks; | |
5103 | } | |
0a24325e JB |
5104 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
5105 | && !failed_cluster_refill) { | |
817d52f8 JB |
5106 | spin_unlock(&last_ptr->refill_lock); |
5107 | ||
0a24325e | 5108 | failed_cluster_refill = true; |
817d52f8 JB |
5109 | wait_block_group_cache_progress(block_group, |
5110 | num_bytes + empty_cluster + empty_size); | |
5111 | goto have_block_group; | |
fa9c0d79 | 5112 | } |
817d52f8 | 5113 | |
fa9c0d79 CM |
5114 | /* |
5115 | * at this point we either didn't find a cluster | |
5116 | * or we weren't able to allocate a block from our | |
5117 | * cluster. Free the cluster we've been trying | |
5118 | * to use, and go to the next block group | |
5119 | */ | |
0a24325e | 5120 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 5121 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 5122 | goto loop; |
fa9c0d79 CM |
5123 | } |
5124 | ||
6226cb0a JB |
5125 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
5126 | num_bytes, empty_size); | |
1cdda9b8 JB |
5127 | /* |
5128 | * If we didn't find a chunk, and we haven't failed on this | |
5129 | * block group before, and this block group is in the middle of | |
5130 | * caching and we are ok with waiting, then go ahead and wait | |
5131 | * for progress to be made, and set failed_alloc to true. | |
5132 | * | |
5133 | * If failed_alloc is true then we've already waited on this | |
5134 | * block group once and should move on to the next block group. | |
5135 | */ | |
5136 | if (!offset && !failed_alloc && !cached && | |
5137 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 5138 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
5139 | num_bytes + empty_size); |
5140 | failed_alloc = true; | |
817d52f8 | 5141 | goto have_block_group; |
1cdda9b8 JB |
5142 | } else if (!offset) { |
5143 | goto loop; | |
817d52f8 | 5144 | } |
fa9c0d79 | 5145 | checks: |
6226cb0a | 5146 | search_start = stripe_align(root, offset); |
2552d17e | 5147 | /* move on to the next group */ |
6226cb0a JB |
5148 | if (search_start + num_bytes >= search_end) { |
5149 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5150 | goto loop; |
6226cb0a | 5151 | } |
25179201 | 5152 | |
2552d17e JB |
5153 | /* move on to the next group */ |
5154 | if (search_start + num_bytes > | |
6226cb0a JB |
5155 | block_group->key.objectid + block_group->key.offset) { |
5156 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5157 | goto loop; |
6226cb0a | 5158 | } |
f5a31e16 | 5159 | |
f0486c68 YZ |
5160 | ins->objectid = search_start; |
5161 | ins->offset = num_bytes; | |
2552d17e | 5162 | |
f0486c68 YZ |
5163 | if (offset < search_start) |
5164 | btrfs_add_free_space(block_group, offset, | |
5165 | search_start - offset); | |
5166 | BUG_ON(offset > search_start); | |
2552d17e | 5167 | |
f0486c68 YZ |
5168 | ret = update_reserved_bytes(block_group, num_bytes, 1, |
5169 | (data & BTRFS_BLOCK_GROUP_DATA)); | |
5170 | if (ret == -EAGAIN) { | |
6226cb0a | 5171 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 5172 | goto loop; |
0f9dd46c | 5173 | } |
0b86a832 | 5174 | |
f0486c68 | 5175 | /* we are all good, lets return */ |
2552d17e JB |
5176 | ins->objectid = search_start; |
5177 | ins->offset = num_bytes; | |
d2fb3437 | 5178 | |
6226cb0a JB |
5179 | if (offset < search_start) |
5180 | btrfs_add_free_space(block_group, offset, | |
5181 | search_start - offset); | |
5182 | BUG_ON(offset > search_start); | |
2552d17e JB |
5183 | break; |
5184 | loop: | |
0a24325e | 5185 | failed_cluster_refill = false; |
1cdda9b8 | 5186 | failed_alloc = false; |
b742bb82 | 5187 | BUG_ON(index != get_block_group_index(block_group)); |
fa9c0d79 | 5188 | btrfs_put_block_group(block_group); |
2552d17e JB |
5189 | } |
5190 | up_read(&space_info->groups_sem); | |
5191 | ||
b742bb82 YZ |
5192 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
5193 | goto search; | |
5194 | ||
ccf0e725 JB |
5195 | /* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for |
5196 | * for them to make caching progress. Also | |
5197 | * determine the best possible bg to cache | |
5198 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
5199 | * caching kthreads as we move along | |
817d52f8 JB |
5200 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
5201 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
5202 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
5203 | * again | |
fa9c0d79 | 5204 | */ |
817d52f8 JB |
5205 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE && |
5206 | (found_uncached_bg || empty_size || empty_cluster || | |
5207 | allowed_chunk_alloc)) { | |
b742bb82 | 5208 | index = 0; |
ccf0e725 | 5209 | if (loop == LOOP_FIND_IDEAL && found_uncached_bg) { |
817d52f8 | 5210 | found_uncached_bg = false; |
ccf0e725 JB |
5211 | loop++; |
5212 | if (!ideal_cache_percent && | |
5213 | atomic_read(&space_info->caching_threads)) | |
817d52f8 | 5214 | goto search; |
ccf0e725 JB |
5215 | |
5216 | /* | |
5217 | * 1 of the following 2 things have happened so far | |
5218 | * | |
5219 | * 1) We found an ideal block group for caching that | |
5220 | * is mostly full and will cache quickly, so we might | |
5221 | * as well wait for it. | |
5222 | * | |
5223 | * 2) We searched for cached only and we didn't find | |
5224 | * anything, and we didn't start any caching kthreads | |
5225 | * either, so chances are we will loop through and | |
5226 | * start a couple caching kthreads, and then come back | |
5227 | * around and just wait for them. This will be slower | |
5228 | * because we will have 2 caching kthreads reading at | |
5229 | * the same time when we could have just started one | |
5230 | * and waited for it to get far enough to give us an | |
5231 | * allocation, so go ahead and go to the wait caching | |
5232 | * loop. | |
5233 | */ | |
5234 | loop = LOOP_CACHING_WAIT; | |
5235 | search_start = ideal_cache_offset; | |
5236 | ideal_cache_percent = 0; | |
5237 | goto ideal_cache; | |
5238 | } else if (loop == LOOP_FIND_IDEAL) { | |
5239 | /* | |
5240 | * Didn't find a uncached bg, wait on anything we find | |
5241 | * next. | |
5242 | */ | |
5243 | loop = LOOP_CACHING_WAIT; | |
5244 | goto search; | |
5245 | } | |
5246 | ||
5247 | if (loop < LOOP_CACHING_WAIT) { | |
5248 | loop++; | |
5249 | goto search; | |
817d52f8 JB |
5250 | } |
5251 | ||
5252 | if (loop == LOOP_ALLOC_CHUNK) { | |
fa9c0d79 CM |
5253 | empty_size = 0; |
5254 | empty_cluster = 0; | |
5255 | } | |
2552d17e JB |
5256 | |
5257 | if (allowed_chunk_alloc) { | |
5258 | ret = do_chunk_alloc(trans, root, num_bytes + | |
5259 | 2 * 1024 * 1024, data, 1); | |
2552d17e | 5260 | allowed_chunk_alloc = 0; |
ccf0e725 JB |
5261 | done_chunk_alloc = 1; |
5262 | } else if (!done_chunk_alloc) { | |
2552d17e JB |
5263 | space_info->force_alloc = 1; |
5264 | } | |
5265 | ||
817d52f8 | 5266 | if (loop < LOOP_NO_EMPTY_SIZE) { |
fa9c0d79 | 5267 | loop++; |
2552d17e | 5268 | goto search; |
fa9c0d79 | 5269 | } |
2552d17e JB |
5270 | ret = -ENOSPC; |
5271 | } else if (!ins->objectid) { | |
5272 | ret = -ENOSPC; | |
f2654de4 | 5273 | } |
0b86a832 | 5274 | |
80eb234a JB |
5275 | /* we found what we needed */ |
5276 | if (ins->objectid) { | |
5277 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
d2fb3437 | 5278 | trans->block_group = block_group->key.objectid; |
0f9dd46c | 5279 | |
fa9c0d79 | 5280 | btrfs_put_block_group(block_group); |
80eb234a | 5281 | ret = 0; |
be744175 | 5282 | } |
be744175 | 5283 | |
0f70abe2 | 5284 | return ret; |
fec577fb | 5285 | } |
ec44a35c | 5286 | |
9ed74f2d JB |
5287 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
5288 | int dump_block_groups) | |
0f9dd46c JB |
5289 | { |
5290 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 5291 | int index = 0; |
0f9dd46c | 5292 | |
9ed74f2d | 5293 | spin_lock(&info->lock); |
d397712b CM |
5294 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
5295 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
9ed74f2d | 5296 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 5297 | info->bytes_readonly), |
d397712b | 5298 | (info->full) ? "" : "not "); |
8929ecfa YZ |
5299 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
5300 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 5301 | (unsigned long long)info->total_bytes, |
8929ecfa | 5302 | (unsigned long long)info->bytes_used, |
21380931 | 5303 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 5304 | (unsigned long long)info->bytes_reserved, |
21380931 | 5305 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 5306 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
5307 | spin_unlock(&info->lock); |
5308 | ||
5309 | if (!dump_block_groups) | |
5310 | return; | |
0f9dd46c | 5311 | |
80eb234a | 5312 | down_read(&info->groups_sem); |
b742bb82 YZ |
5313 | again: |
5314 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 5315 | spin_lock(&cache->lock); |
d397712b CM |
5316 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
5317 | "%llu pinned %llu reserved\n", | |
5318 | (unsigned long long)cache->key.objectid, | |
5319 | (unsigned long long)cache->key.offset, | |
5320 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
5321 | (unsigned long long)cache->pinned, | |
5322 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
5323 | btrfs_dump_free_space(cache, bytes); |
5324 | spin_unlock(&cache->lock); | |
5325 | } | |
b742bb82 YZ |
5326 | if (++index < BTRFS_NR_RAID_TYPES) |
5327 | goto again; | |
80eb234a | 5328 | up_read(&info->groups_sem); |
0f9dd46c | 5329 | } |
e8569813 | 5330 | |
11833d66 YZ |
5331 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
5332 | struct btrfs_root *root, | |
5333 | u64 num_bytes, u64 min_alloc_size, | |
5334 | u64 empty_size, u64 hint_byte, | |
5335 | u64 search_end, struct btrfs_key *ins, | |
5336 | u64 data) | |
fec577fb CM |
5337 | { |
5338 | int ret; | |
fbdc762b | 5339 | u64 search_start = 0; |
925baedd | 5340 | |
6a63209f | 5341 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 5342 | again: |
0ef3e66b CM |
5343 | /* |
5344 | * the only place that sets empty_size is btrfs_realloc_node, which | |
5345 | * is not called recursively on allocations | |
5346 | */ | |
83d3c969 | 5347 | if (empty_size || root->ref_cows) |
6324fbf3 | 5348 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b | 5349 | num_bytes + 2 * 1024 * 1024, data, 0); |
0b86a832 | 5350 | |
db94535d CM |
5351 | WARN_ON(num_bytes < root->sectorsize); |
5352 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
f0486c68 YZ |
5353 | search_start, search_end, hint_byte, |
5354 | ins, data); | |
3b951516 | 5355 | |
98d20f67 CM |
5356 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
5357 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 5358 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 5359 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
5360 | do_chunk_alloc(trans, root->fs_info->extent_root, |
5361 | num_bytes, data, 1); | |
98d20f67 CM |
5362 | goto again; |
5363 | } | |
817d52f8 | 5364 | if (ret == -ENOSPC) { |
0f9dd46c JB |
5365 | struct btrfs_space_info *sinfo; |
5366 | ||
5367 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
5368 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
5369 | "wanted %llu\n", (unsigned long long)data, | |
5370 | (unsigned long long)num_bytes); | |
9ed74f2d | 5371 | dump_space_info(sinfo, num_bytes, 1); |
925baedd | 5372 | } |
0f9dd46c JB |
5373 | |
5374 | return ret; | |
e6dcd2dc CM |
5375 | } |
5376 | ||
65b51a00 CM |
5377 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
5378 | { | |
0f9dd46c | 5379 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 5380 | int ret = 0; |
0f9dd46c | 5381 | |
0f9dd46c JB |
5382 | cache = btrfs_lookup_block_group(root->fs_info, start); |
5383 | if (!cache) { | |
d397712b CM |
5384 | printk(KERN_ERR "Unable to find block group for %llu\n", |
5385 | (unsigned long long)start); | |
0f9dd46c JB |
5386 | return -ENOSPC; |
5387 | } | |
1f3c79a2 LH |
5388 | |
5389 | ret = btrfs_discard_extent(root, start, len); | |
5390 | ||
0f9dd46c | 5391 | btrfs_add_free_space(cache, start, len); |
f0486c68 | 5392 | update_reserved_bytes(cache, len, 0, 1); |
fa9c0d79 | 5393 | btrfs_put_block_group(cache); |
817d52f8 | 5394 | |
e6dcd2dc CM |
5395 | return ret; |
5396 | } | |
5397 | ||
5d4f98a2 YZ |
5398 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
5399 | struct btrfs_root *root, | |
5400 | u64 parent, u64 root_objectid, | |
5401 | u64 flags, u64 owner, u64 offset, | |
5402 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
5403 | { |
5404 | int ret; | |
5d4f98a2 | 5405 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 5406 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 5407 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 5408 | struct btrfs_path *path; |
5d4f98a2 YZ |
5409 | struct extent_buffer *leaf; |
5410 | int type; | |
5411 | u32 size; | |
26b8003f | 5412 | |
5d4f98a2 YZ |
5413 | if (parent > 0) |
5414 | type = BTRFS_SHARED_DATA_REF_KEY; | |
5415 | else | |
5416 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 5417 | |
5d4f98a2 | 5418 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
5419 | |
5420 | path = btrfs_alloc_path(); | |
5421 | BUG_ON(!path); | |
47e4bb98 | 5422 | |
b9473439 | 5423 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5424 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
5425 | ins, size); | |
ccd467d6 | 5426 | BUG_ON(ret); |
0f9dd46c | 5427 | |
5d4f98a2 YZ |
5428 | leaf = path->nodes[0]; |
5429 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 5430 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5431 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
5432 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5433 | btrfs_set_extent_flags(leaf, extent_item, | |
5434 | flags | BTRFS_EXTENT_FLAG_DATA); | |
5435 | ||
5436 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
5437 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
5438 | if (parent > 0) { | |
5439 | struct btrfs_shared_data_ref *ref; | |
5440 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
5441 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5442 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
5443 | } else { | |
5444 | struct btrfs_extent_data_ref *ref; | |
5445 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
5446 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
5447 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
5448 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
5449 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
5450 | } | |
47e4bb98 CM |
5451 | |
5452 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 5453 | btrfs_free_path(path); |
f510cfec | 5454 | |
f0486c68 | 5455 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
f5947066 | 5456 | if (ret) { |
d397712b CM |
5457 | printk(KERN_ERR "btrfs update block group failed for %llu " |
5458 | "%llu\n", (unsigned long long)ins->objectid, | |
5459 | (unsigned long long)ins->offset); | |
f5947066 CM |
5460 | BUG(); |
5461 | } | |
e6dcd2dc CM |
5462 | return ret; |
5463 | } | |
5464 | ||
5d4f98a2 YZ |
5465 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
5466 | struct btrfs_root *root, | |
5467 | u64 parent, u64 root_objectid, | |
5468 | u64 flags, struct btrfs_disk_key *key, | |
5469 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
5470 | { |
5471 | int ret; | |
5d4f98a2 YZ |
5472 | struct btrfs_fs_info *fs_info = root->fs_info; |
5473 | struct btrfs_extent_item *extent_item; | |
5474 | struct btrfs_tree_block_info *block_info; | |
5475 | struct btrfs_extent_inline_ref *iref; | |
5476 | struct btrfs_path *path; | |
5477 | struct extent_buffer *leaf; | |
5478 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 5479 | |
5d4f98a2 YZ |
5480 | path = btrfs_alloc_path(); |
5481 | BUG_ON(!path); | |
56bec294 | 5482 | |
5d4f98a2 YZ |
5483 | path->leave_spinning = 1; |
5484 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
5485 | ins, size); | |
56bec294 | 5486 | BUG_ON(ret); |
5d4f98a2 YZ |
5487 | |
5488 | leaf = path->nodes[0]; | |
5489 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
5490 | struct btrfs_extent_item); | |
5491 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
5492 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5493 | btrfs_set_extent_flags(leaf, extent_item, | |
5494 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5495 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
5496 | ||
5497 | btrfs_set_tree_block_key(leaf, block_info, key); | |
5498 | btrfs_set_tree_block_level(leaf, block_info, level); | |
5499 | ||
5500 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
5501 | if (parent > 0) { | |
5502 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
5503 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5504 | BTRFS_SHARED_BLOCK_REF_KEY); | |
5505 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5506 | } else { | |
5507 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5508 | BTRFS_TREE_BLOCK_REF_KEY); | |
5509 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
5510 | } | |
5511 | ||
5512 | btrfs_mark_buffer_dirty(leaf); | |
5513 | btrfs_free_path(path); | |
5514 | ||
f0486c68 | 5515 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
5d4f98a2 YZ |
5516 | if (ret) { |
5517 | printk(KERN_ERR "btrfs update block group failed for %llu " | |
5518 | "%llu\n", (unsigned long long)ins->objectid, | |
5519 | (unsigned long long)ins->offset); | |
5520 | BUG(); | |
5521 | } | |
5522 | return ret; | |
5523 | } | |
5524 | ||
5525 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
5526 | struct btrfs_root *root, | |
5527 | u64 root_objectid, u64 owner, | |
5528 | u64 offset, struct btrfs_key *ins) | |
5529 | { | |
5530 | int ret; | |
5531 | ||
5532 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
5533 | ||
5534 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, | |
5535 | 0, root_objectid, owner, offset, | |
5536 | BTRFS_ADD_DELAYED_EXTENT, NULL); | |
e6dcd2dc CM |
5537 | return ret; |
5538 | } | |
e02119d5 CM |
5539 | |
5540 | /* | |
5541 | * this is used by the tree logging recovery code. It records that | |
5542 | * an extent has been allocated and makes sure to clear the free | |
5543 | * space cache bits as well | |
5544 | */ | |
5d4f98a2 YZ |
5545 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
5546 | struct btrfs_root *root, | |
5547 | u64 root_objectid, u64 owner, u64 offset, | |
5548 | struct btrfs_key *ins) | |
e02119d5 CM |
5549 | { |
5550 | int ret; | |
5551 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
5552 | struct btrfs_caching_control *caching_ctl; |
5553 | u64 start = ins->objectid; | |
5554 | u64 num_bytes = ins->offset; | |
e02119d5 | 5555 | |
e02119d5 | 5556 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
b8399dee | 5557 | cache_block_group(block_group, trans, NULL, 0); |
11833d66 | 5558 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 5559 | |
11833d66 YZ |
5560 | if (!caching_ctl) { |
5561 | BUG_ON(!block_group_cache_done(block_group)); | |
5562 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5563 | BUG_ON(ret); | |
5564 | } else { | |
5565 | mutex_lock(&caching_ctl->mutex); | |
5566 | ||
5567 | if (start >= caching_ctl->progress) { | |
5568 | ret = add_excluded_extent(root, start, num_bytes); | |
5569 | BUG_ON(ret); | |
5570 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5571 | ret = btrfs_remove_free_space(block_group, | |
5572 | start, num_bytes); | |
5573 | BUG_ON(ret); | |
5574 | } else { | |
5575 | num_bytes = caching_ctl->progress - start; | |
5576 | ret = btrfs_remove_free_space(block_group, | |
5577 | start, num_bytes); | |
5578 | BUG_ON(ret); | |
5579 | ||
5580 | start = caching_ctl->progress; | |
5581 | num_bytes = ins->objectid + ins->offset - | |
5582 | caching_ctl->progress; | |
5583 | ret = add_excluded_extent(root, start, num_bytes); | |
5584 | BUG_ON(ret); | |
5585 | } | |
5586 | ||
5587 | mutex_unlock(&caching_ctl->mutex); | |
5588 | put_caching_control(caching_ctl); | |
5589 | } | |
5590 | ||
f0486c68 YZ |
5591 | ret = update_reserved_bytes(block_group, ins->offset, 1, 1); |
5592 | BUG_ON(ret); | |
fa9c0d79 | 5593 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
5594 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
5595 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
5596 | return ret; |
5597 | } | |
5598 | ||
65b51a00 CM |
5599 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
5600 | struct btrfs_root *root, | |
4008c04a CM |
5601 | u64 bytenr, u32 blocksize, |
5602 | int level) | |
65b51a00 CM |
5603 | { |
5604 | struct extent_buffer *buf; | |
5605 | ||
5606 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
5607 | if (!buf) | |
5608 | return ERR_PTR(-ENOMEM); | |
5609 | btrfs_set_header_generation(buf, trans->transid); | |
4008c04a | 5610 | btrfs_set_buffer_lockdep_class(buf, level); |
65b51a00 CM |
5611 | btrfs_tree_lock(buf); |
5612 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
5613 | |
5614 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 5615 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 5616 | |
d0c803c4 | 5617 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
5618 | /* |
5619 | * we allow two log transactions at a time, use different | |
5620 | * EXENT bit to differentiate dirty pages. | |
5621 | */ | |
5622 | if (root->log_transid % 2 == 0) | |
5623 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
5624 | buf->start + buf->len - 1, GFP_NOFS); | |
5625 | else | |
5626 | set_extent_new(&root->dirty_log_pages, buf->start, | |
5627 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
5628 | } else { |
5629 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 5630 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 5631 | } |
65b51a00 | 5632 | trans->blocks_used++; |
b4ce94de | 5633 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
5634 | return buf; |
5635 | } | |
5636 | ||
f0486c68 YZ |
5637 | static struct btrfs_block_rsv * |
5638 | use_block_rsv(struct btrfs_trans_handle *trans, | |
5639 | struct btrfs_root *root, u32 blocksize) | |
5640 | { | |
5641 | struct btrfs_block_rsv *block_rsv; | |
5642 | int ret; | |
5643 | ||
5644 | block_rsv = get_block_rsv(trans, root); | |
5645 | ||
5646 | if (block_rsv->size == 0) { | |
8bb8ab2e JB |
5647 | ret = reserve_metadata_bytes(trans, root, block_rsv, |
5648 | blocksize, 0); | |
f0486c68 YZ |
5649 | if (ret) |
5650 | return ERR_PTR(ret); | |
5651 | return block_rsv; | |
5652 | } | |
5653 | ||
5654 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
5655 | if (!ret) | |
5656 | return block_rsv; | |
5657 | ||
f0486c68 YZ |
5658 | return ERR_PTR(-ENOSPC); |
5659 | } | |
5660 | ||
5661 | static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
5662 | { | |
5663 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
5664 | block_rsv_release_bytes(block_rsv, NULL, 0); | |
5665 | } | |
5666 | ||
fec577fb | 5667 | /* |
f0486c68 YZ |
5668 | * finds a free extent and does all the dirty work required for allocation |
5669 | * returns the key for the extent through ins, and a tree buffer for | |
5670 | * the first block of the extent through buf. | |
5671 | * | |
fec577fb CM |
5672 | * returns the tree buffer or NULL. |
5673 | */ | |
5f39d397 | 5674 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
5675 | struct btrfs_root *root, u32 blocksize, |
5676 | u64 parent, u64 root_objectid, | |
5677 | struct btrfs_disk_key *key, int level, | |
5678 | u64 hint, u64 empty_size) | |
fec577fb | 5679 | { |
e2fa7227 | 5680 | struct btrfs_key ins; |
f0486c68 | 5681 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 5682 | struct extent_buffer *buf; |
f0486c68 YZ |
5683 | u64 flags = 0; |
5684 | int ret; | |
5685 | ||
fec577fb | 5686 | |
f0486c68 YZ |
5687 | block_rsv = use_block_rsv(trans, root, blocksize); |
5688 | if (IS_ERR(block_rsv)) | |
5689 | return ERR_CAST(block_rsv); | |
5690 | ||
5691 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
5692 | empty_size, hint, (u64)-1, &ins, 0); | |
fec577fb | 5693 | if (ret) { |
f0486c68 | 5694 | unuse_block_rsv(block_rsv, blocksize); |
54aa1f4d | 5695 | return ERR_PTR(ret); |
fec577fb | 5696 | } |
55c69072 | 5697 | |
4008c04a CM |
5698 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
5699 | blocksize, level); | |
f0486c68 YZ |
5700 | BUG_ON(IS_ERR(buf)); |
5701 | ||
5702 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
5703 | if (parent == 0) | |
5704 | parent = ins.objectid; | |
5705 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
5706 | } else | |
5707 | BUG_ON(parent > 0); | |
5708 | ||
5709 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5710 | struct btrfs_delayed_extent_op *extent_op; | |
5711 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
5712 | BUG_ON(!extent_op); | |
5713 | if (key) | |
5714 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
5715 | else | |
5716 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
5717 | extent_op->flags_to_set = flags; | |
5718 | extent_op->update_key = 1; | |
5719 | extent_op->update_flags = 1; | |
5720 | extent_op->is_data = 0; | |
5721 | ||
5722 | ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, | |
5723 | ins.offset, parent, root_objectid, | |
5724 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5725 | extent_op); | |
5726 | BUG_ON(ret); | |
5727 | } | |
fec577fb CM |
5728 | return buf; |
5729 | } | |
a28ec197 | 5730 | |
2c47e605 YZ |
5731 | struct walk_control { |
5732 | u64 refs[BTRFS_MAX_LEVEL]; | |
5733 | u64 flags[BTRFS_MAX_LEVEL]; | |
5734 | struct btrfs_key update_progress; | |
5735 | int stage; | |
5736 | int level; | |
5737 | int shared_level; | |
5738 | int update_ref; | |
5739 | int keep_locks; | |
1c4850e2 YZ |
5740 | int reada_slot; |
5741 | int reada_count; | |
2c47e605 YZ |
5742 | }; |
5743 | ||
5744 | #define DROP_REFERENCE 1 | |
5745 | #define UPDATE_BACKREF 2 | |
5746 | ||
1c4850e2 YZ |
5747 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
5748 | struct btrfs_root *root, | |
5749 | struct walk_control *wc, | |
5750 | struct btrfs_path *path) | |
6407bf6d | 5751 | { |
1c4850e2 YZ |
5752 | u64 bytenr; |
5753 | u64 generation; | |
5754 | u64 refs; | |
94fcca9f | 5755 | u64 flags; |
5d4f98a2 | 5756 | u32 nritems; |
1c4850e2 YZ |
5757 | u32 blocksize; |
5758 | struct btrfs_key key; | |
5759 | struct extent_buffer *eb; | |
6407bf6d | 5760 | int ret; |
1c4850e2 YZ |
5761 | int slot; |
5762 | int nread = 0; | |
6407bf6d | 5763 | |
1c4850e2 YZ |
5764 | if (path->slots[wc->level] < wc->reada_slot) { |
5765 | wc->reada_count = wc->reada_count * 2 / 3; | |
5766 | wc->reada_count = max(wc->reada_count, 2); | |
5767 | } else { | |
5768 | wc->reada_count = wc->reada_count * 3 / 2; | |
5769 | wc->reada_count = min_t(int, wc->reada_count, | |
5770 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
5771 | } | |
7bb86316 | 5772 | |
1c4850e2 YZ |
5773 | eb = path->nodes[wc->level]; |
5774 | nritems = btrfs_header_nritems(eb); | |
5775 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 5776 | |
1c4850e2 YZ |
5777 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
5778 | if (nread >= wc->reada_count) | |
5779 | break; | |
bd56b302 | 5780 | |
2dd3e67b | 5781 | cond_resched(); |
1c4850e2 YZ |
5782 | bytenr = btrfs_node_blockptr(eb, slot); |
5783 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 5784 | |
1c4850e2 YZ |
5785 | if (slot == path->slots[wc->level]) |
5786 | goto reada; | |
5d4f98a2 | 5787 | |
1c4850e2 YZ |
5788 | if (wc->stage == UPDATE_BACKREF && |
5789 | generation <= root->root_key.offset) | |
bd56b302 CM |
5790 | continue; |
5791 | ||
94fcca9f YZ |
5792 | /* We don't lock the tree block, it's OK to be racy here */ |
5793 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
5794 | &refs, &flags); | |
5795 | BUG_ON(ret); | |
5796 | BUG_ON(refs == 0); | |
5797 | ||
1c4850e2 | 5798 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
5799 | if (refs == 1) |
5800 | goto reada; | |
bd56b302 | 5801 | |
94fcca9f YZ |
5802 | if (wc->level == 1 && |
5803 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5804 | continue; | |
1c4850e2 YZ |
5805 | if (!wc->update_ref || |
5806 | generation <= root->root_key.offset) | |
5807 | continue; | |
5808 | btrfs_node_key_to_cpu(eb, &key, slot); | |
5809 | ret = btrfs_comp_cpu_keys(&key, | |
5810 | &wc->update_progress); | |
5811 | if (ret < 0) | |
5812 | continue; | |
94fcca9f YZ |
5813 | } else { |
5814 | if (wc->level == 1 && | |
5815 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5816 | continue; | |
6407bf6d | 5817 | } |
1c4850e2 YZ |
5818 | reada: |
5819 | ret = readahead_tree_block(root, bytenr, blocksize, | |
5820 | generation); | |
5821 | if (ret) | |
bd56b302 | 5822 | break; |
1c4850e2 | 5823 | nread++; |
20524f02 | 5824 | } |
1c4850e2 | 5825 | wc->reada_slot = slot; |
20524f02 | 5826 | } |
2c47e605 | 5827 | |
f82d02d9 | 5828 | /* |
2c47e605 YZ |
5829 | * hepler to process tree block while walking down the tree. |
5830 | * | |
2c47e605 YZ |
5831 | * when wc->stage == UPDATE_BACKREF, this function updates |
5832 | * back refs for pointers in the block. | |
5833 | * | |
5834 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 5835 | */ |
2c47e605 | 5836 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 5837 | struct btrfs_root *root, |
2c47e605 | 5838 | struct btrfs_path *path, |
94fcca9f | 5839 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 5840 | { |
2c47e605 YZ |
5841 | int level = wc->level; |
5842 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 5843 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
5844 | int ret; |
5845 | ||
2c47e605 YZ |
5846 | if (wc->stage == UPDATE_BACKREF && |
5847 | btrfs_header_owner(eb) != root->root_key.objectid) | |
5848 | return 1; | |
f82d02d9 | 5849 | |
2c47e605 YZ |
5850 | /* |
5851 | * when reference count of tree block is 1, it won't increase | |
5852 | * again. once full backref flag is set, we never clear it. | |
5853 | */ | |
94fcca9f YZ |
5854 | if (lookup_info && |
5855 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
5856 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
5857 | BUG_ON(!path->locks[level]); |
5858 | ret = btrfs_lookup_extent_info(trans, root, | |
5859 | eb->start, eb->len, | |
5860 | &wc->refs[level], | |
5861 | &wc->flags[level]); | |
5862 | BUG_ON(ret); | |
5863 | BUG_ON(wc->refs[level] == 0); | |
5864 | } | |
5d4f98a2 | 5865 | |
2c47e605 YZ |
5866 | if (wc->stage == DROP_REFERENCE) { |
5867 | if (wc->refs[level] > 1) | |
5868 | return 1; | |
f82d02d9 | 5869 | |
2c47e605 YZ |
5870 | if (path->locks[level] && !wc->keep_locks) { |
5871 | btrfs_tree_unlock(eb); | |
5872 | path->locks[level] = 0; | |
5873 | } | |
5874 | return 0; | |
5875 | } | |
f82d02d9 | 5876 | |
2c47e605 YZ |
5877 | /* wc->stage == UPDATE_BACKREF */ |
5878 | if (!(wc->flags[level] & flag)) { | |
5879 | BUG_ON(!path->locks[level]); | |
5880 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
f82d02d9 | 5881 | BUG_ON(ret); |
2c47e605 YZ |
5882 | ret = btrfs_dec_ref(trans, root, eb, 0); |
5883 | BUG_ON(ret); | |
5884 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
5885 | eb->len, flag, 0); | |
5886 | BUG_ON(ret); | |
5887 | wc->flags[level] |= flag; | |
5888 | } | |
5889 | ||
5890 | /* | |
5891 | * the block is shared by multiple trees, so it's not good to | |
5892 | * keep the tree lock | |
5893 | */ | |
5894 | if (path->locks[level] && level > 0) { | |
5895 | btrfs_tree_unlock(eb); | |
5896 | path->locks[level] = 0; | |
5897 | } | |
5898 | return 0; | |
5899 | } | |
5900 | ||
1c4850e2 YZ |
5901 | /* |
5902 | * hepler to process tree block pointer. | |
5903 | * | |
5904 | * when wc->stage == DROP_REFERENCE, this function checks | |
5905 | * reference count of the block pointed to. if the block | |
5906 | * is shared and we need update back refs for the subtree | |
5907 | * rooted at the block, this function changes wc->stage to | |
5908 | * UPDATE_BACKREF. if the block is shared and there is no | |
5909 | * need to update back, this function drops the reference | |
5910 | * to the block. | |
5911 | * | |
5912 | * NOTE: return value 1 means we should stop walking down. | |
5913 | */ | |
5914 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
5915 | struct btrfs_root *root, | |
5916 | struct btrfs_path *path, | |
94fcca9f | 5917 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
5918 | { |
5919 | u64 bytenr; | |
5920 | u64 generation; | |
5921 | u64 parent; | |
5922 | u32 blocksize; | |
5923 | struct btrfs_key key; | |
5924 | struct extent_buffer *next; | |
5925 | int level = wc->level; | |
5926 | int reada = 0; | |
5927 | int ret = 0; | |
5928 | ||
5929 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
5930 | path->slots[level]); | |
5931 | /* | |
5932 | * if the lower level block was created before the snapshot | |
5933 | * was created, we know there is no need to update back refs | |
5934 | * for the subtree | |
5935 | */ | |
5936 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
5937 | generation <= root->root_key.offset) { |
5938 | *lookup_info = 1; | |
1c4850e2 | 5939 | return 1; |
94fcca9f | 5940 | } |
1c4850e2 YZ |
5941 | |
5942 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
5943 | blocksize = btrfs_level_size(root, level - 1); | |
5944 | ||
5945 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
5946 | if (!next) { | |
5947 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
5948 | if (!next) |
5949 | return -ENOMEM; | |
1c4850e2 YZ |
5950 | reada = 1; |
5951 | } | |
5952 | btrfs_tree_lock(next); | |
5953 | btrfs_set_lock_blocking(next); | |
5954 | ||
94fcca9f YZ |
5955 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
5956 | &wc->refs[level - 1], | |
5957 | &wc->flags[level - 1]); | |
5958 | BUG_ON(ret); | |
5959 | BUG_ON(wc->refs[level - 1] == 0); | |
5960 | *lookup_info = 0; | |
1c4850e2 | 5961 | |
94fcca9f | 5962 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 5963 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
5964 | if (level == 1 && |
5965 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5966 | goto skip; | |
5967 | ||
1c4850e2 YZ |
5968 | if (!wc->update_ref || |
5969 | generation <= root->root_key.offset) | |
5970 | goto skip; | |
5971 | ||
5972 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
5973 | path->slots[level]); | |
5974 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
5975 | if (ret < 0) | |
5976 | goto skip; | |
5977 | ||
5978 | wc->stage = UPDATE_BACKREF; | |
5979 | wc->shared_level = level - 1; | |
5980 | } | |
94fcca9f YZ |
5981 | } else { |
5982 | if (level == 1 && | |
5983 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5984 | goto skip; | |
1c4850e2 YZ |
5985 | } |
5986 | ||
5987 | if (!btrfs_buffer_uptodate(next, generation)) { | |
5988 | btrfs_tree_unlock(next); | |
5989 | free_extent_buffer(next); | |
5990 | next = NULL; | |
94fcca9f | 5991 | *lookup_info = 1; |
1c4850e2 YZ |
5992 | } |
5993 | ||
5994 | if (!next) { | |
5995 | if (reada && level == 1) | |
5996 | reada_walk_down(trans, root, wc, path); | |
5997 | next = read_tree_block(root, bytenr, blocksize, generation); | |
5998 | btrfs_tree_lock(next); | |
5999 | btrfs_set_lock_blocking(next); | |
6000 | } | |
6001 | ||
6002 | level--; | |
6003 | BUG_ON(level != btrfs_header_level(next)); | |
6004 | path->nodes[level] = next; | |
6005 | path->slots[level] = 0; | |
6006 | path->locks[level] = 1; | |
6007 | wc->level = level; | |
6008 | if (wc->level == 1) | |
6009 | wc->reada_slot = 0; | |
6010 | return 0; | |
6011 | skip: | |
6012 | wc->refs[level - 1] = 0; | |
6013 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
6014 | if (wc->stage == DROP_REFERENCE) { |
6015 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
6016 | parent = path->nodes[level]->start; | |
6017 | } else { | |
6018 | BUG_ON(root->root_key.objectid != | |
6019 | btrfs_header_owner(path->nodes[level])); | |
6020 | parent = 0; | |
6021 | } | |
1c4850e2 | 6022 | |
94fcca9f YZ |
6023 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
6024 | root->root_key.objectid, level - 1, 0); | |
6025 | BUG_ON(ret); | |
1c4850e2 | 6026 | } |
1c4850e2 YZ |
6027 | btrfs_tree_unlock(next); |
6028 | free_extent_buffer(next); | |
94fcca9f | 6029 | *lookup_info = 1; |
1c4850e2 YZ |
6030 | return 1; |
6031 | } | |
6032 | ||
2c47e605 YZ |
6033 | /* |
6034 | * hepler to process tree block while walking up the tree. | |
6035 | * | |
6036 | * when wc->stage == DROP_REFERENCE, this function drops | |
6037 | * reference count on the block. | |
6038 | * | |
6039 | * when wc->stage == UPDATE_BACKREF, this function changes | |
6040 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
6041 | * to UPDATE_BACKREF previously while processing the block. | |
6042 | * | |
6043 | * NOTE: return value 1 means we should stop walking up. | |
6044 | */ | |
6045 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
6046 | struct btrfs_root *root, | |
6047 | struct btrfs_path *path, | |
6048 | struct walk_control *wc) | |
6049 | { | |
f0486c68 | 6050 | int ret; |
2c47e605 YZ |
6051 | int level = wc->level; |
6052 | struct extent_buffer *eb = path->nodes[level]; | |
6053 | u64 parent = 0; | |
6054 | ||
6055 | if (wc->stage == UPDATE_BACKREF) { | |
6056 | BUG_ON(wc->shared_level < level); | |
6057 | if (level < wc->shared_level) | |
6058 | goto out; | |
6059 | ||
2c47e605 YZ |
6060 | ret = find_next_key(path, level + 1, &wc->update_progress); |
6061 | if (ret > 0) | |
6062 | wc->update_ref = 0; | |
6063 | ||
6064 | wc->stage = DROP_REFERENCE; | |
6065 | wc->shared_level = -1; | |
6066 | path->slots[level] = 0; | |
6067 | ||
6068 | /* | |
6069 | * check reference count again if the block isn't locked. | |
6070 | * we should start walking down the tree again if reference | |
6071 | * count is one. | |
6072 | */ | |
6073 | if (!path->locks[level]) { | |
6074 | BUG_ON(level == 0); | |
6075 | btrfs_tree_lock(eb); | |
6076 | btrfs_set_lock_blocking(eb); | |
6077 | path->locks[level] = 1; | |
6078 | ||
6079 | ret = btrfs_lookup_extent_info(trans, root, | |
6080 | eb->start, eb->len, | |
6081 | &wc->refs[level], | |
6082 | &wc->flags[level]); | |
f82d02d9 | 6083 | BUG_ON(ret); |
2c47e605 YZ |
6084 | BUG_ON(wc->refs[level] == 0); |
6085 | if (wc->refs[level] == 1) { | |
6086 | btrfs_tree_unlock(eb); | |
6087 | path->locks[level] = 0; | |
6088 | return 1; | |
6089 | } | |
f82d02d9 | 6090 | } |
2c47e605 | 6091 | } |
f82d02d9 | 6092 | |
2c47e605 YZ |
6093 | /* wc->stage == DROP_REFERENCE */ |
6094 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 6095 | |
2c47e605 YZ |
6096 | if (wc->refs[level] == 1) { |
6097 | if (level == 0) { | |
6098 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6099 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
6100 | else | |
6101 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
6102 | BUG_ON(ret); | |
6103 | } | |
6104 | /* make block locked assertion in clean_tree_block happy */ | |
6105 | if (!path->locks[level] && | |
6106 | btrfs_header_generation(eb) == trans->transid) { | |
6107 | btrfs_tree_lock(eb); | |
6108 | btrfs_set_lock_blocking(eb); | |
6109 | path->locks[level] = 1; | |
6110 | } | |
6111 | clean_tree_block(trans, root, eb); | |
6112 | } | |
6113 | ||
6114 | if (eb == root->node) { | |
6115 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6116 | parent = eb->start; | |
6117 | else | |
6118 | BUG_ON(root->root_key.objectid != | |
6119 | btrfs_header_owner(eb)); | |
6120 | } else { | |
6121 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6122 | parent = path->nodes[level + 1]->start; | |
6123 | else | |
6124 | BUG_ON(root->root_key.objectid != | |
6125 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 6126 | } |
f82d02d9 | 6127 | |
f0486c68 | 6128 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
6129 | out: |
6130 | wc->refs[level] = 0; | |
6131 | wc->flags[level] = 0; | |
f0486c68 | 6132 | return 0; |
2c47e605 YZ |
6133 | } |
6134 | ||
6135 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
6136 | struct btrfs_root *root, | |
6137 | struct btrfs_path *path, | |
6138 | struct walk_control *wc) | |
6139 | { | |
2c47e605 | 6140 | int level = wc->level; |
94fcca9f | 6141 | int lookup_info = 1; |
2c47e605 YZ |
6142 | int ret; |
6143 | ||
6144 | while (level >= 0) { | |
94fcca9f | 6145 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
6146 | if (ret > 0) |
6147 | break; | |
6148 | ||
6149 | if (level == 0) | |
6150 | break; | |
6151 | ||
7a7965f8 YZ |
6152 | if (path->slots[level] >= |
6153 | btrfs_header_nritems(path->nodes[level])) | |
6154 | break; | |
6155 | ||
94fcca9f | 6156 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
6157 | if (ret > 0) { |
6158 | path->slots[level]++; | |
6159 | continue; | |
90d2c51d MX |
6160 | } else if (ret < 0) |
6161 | return ret; | |
1c4850e2 | 6162 | level = wc->level; |
f82d02d9 | 6163 | } |
f82d02d9 YZ |
6164 | return 0; |
6165 | } | |
6166 | ||
d397712b | 6167 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 6168 | struct btrfs_root *root, |
f82d02d9 | 6169 | struct btrfs_path *path, |
2c47e605 | 6170 | struct walk_control *wc, int max_level) |
20524f02 | 6171 | { |
2c47e605 | 6172 | int level = wc->level; |
20524f02 | 6173 | int ret; |
9f3a7427 | 6174 | |
2c47e605 YZ |
6175 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
6176 | while (level < max_level && path->nodes[level]) { | |
6177 | wc->level = level; | |
6178 | if (path->slots[level] + 1 < | |
6179 | btrfs_header_nritems(path->nodes[level])) { | |
6180 | path->slots[level]++; | |
20524f02 CM |
6181 | return 0; |
6182 | } else { | |
2c47e605 YZ |
6183 | ret = walk_up_proc(trans, root, path, wc); |
6184 | if (ret > 0) | |
6185 | return 0; | |
bd56b302 | 6186 | |
2c47e605 YZ |
6187 | if (path->locks[level]) { |
6188 | btrfs_tree_unlock(path->nodes[level]); | |
6189 | path->locks[level] = 0; | |
f82d02d9 | 6190 | } |
2c47e605 YZ |
6191 | free_extent_buffer(path->nodes[level]); |
6192 | path->nodes[level] = NULL; | |
6193 | level++; | |
20524f02 CM |
6194 | } |
6195 | } | |
6196 | return 1; | |
6197 | } | |
6198 | ||
9aca1d51 | 6199 | /* |
2c47e605 YZ |
6200 | * drop a subvolume tree. |
6201 | * | |
6202 | * this function traverses the tree freeing any blocks that only | |
6203 | * referenced by the tree. | |
6204 | * | |
6205 | * when a shared tree block is found. this function decreases its | |
6206 | * reference count by one. if update_ref is true, this function | |
6207 | * also make sure backrefs for the shared block and all lower level | |
6208 | * blocks are properly updated. | |
9aca1d51 | 6209 | */ |
3fd0a558 YZ |
6210 | int btrfs_drop_snapshot(struct btrfs_root *root, |
6211 | struct btrfs_block_rsv *block_rsv, int update_ref) | |
20524f02 | 6212 | { |
5caf2a00 | 6213 | struct btrfs_path *path; |
2c47e605 YZ |
6214 | struct btrfs_trans_handle *trans; |
6215 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 6216 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
6217 | struct walk_control *wc; |
6218 | struct btrfs_key key; | |
6219 | int err = 0; | |
6220 | int ret; | |
6221 | int level; | |
20524f02 | 6222 | |
5caf2a00 CM |
6223 | path = btrfs_alloc_path(); |
6224 | BUG_ON(!path); | |
20524f02 | 6225 | |
2c47e605 YZ |
6226 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
6227 | BUG_ON(!wc); | |
6228 | ||
a22285a6 | 6229 | trans = btrfs_start_transaction(tree_root, 0); |
3fd0a558 YZ |
6230 | if (block_rsv) |
6231 | trans->block_rsv = block_rsv; | |
2c47e605 | 6232 | |
9f3a7427 | 6233 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 6234 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
6235 | path->nodes[level] = btrfs_lock_root_node(root); |
6236 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 6237 | path->slots[level] = 0; |
5d4f98a2 | 6238 | path->locks[level] = 1; |
2c47e605 YZ |
6239 | memset(&wc->update_progress, 0, |
6240 | sizeof(wc->update_progress)); | |
9f3a7427 | 6241 | } else { |
9f3a7427 | 6242 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
6243 | memcpy(&wc->update_progress, &key, |
6244 | sizeof(wc->update_progress)); | |
6245 | ||
6702ed49 | 6246 | level = root_item->drop_level; |
2c47e605 | 6247 | BUG_ON(level == 0); |
6702ed49 | 6248 | path->lowest_level = level; |
2c47e605 YZ |
6249 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6250 | path->lowest_level = 0; | |
6251 | if (ret < 0) { | |
6252 | err = ret; | |
9f3a7427 CM |
6253 | goto out; |
6254 | } | |
1c4850e2 | 6255 | WARN_ON(ret > 0); |
2c47e605 | 6256 | |
7d9eb12c CM |
6257 | /* |
6258 | * unlock our path, this is safe because only this | |
6259 | * function is allowed to delete this snapshot | |
6260 | */ | |
5d4f98a2 | 6261 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
6262 | |
6263 | level = btrfs_header_level(root->node); | |
6264 | while (1) { | |
6265 | btrfs_tree_lock(path->nodes[level]); | |
6266 | btrfs_set_lock_blocking(path->nodes[level]); | |
6267 | ||
6268 | ret = btrfs_lookup_extent_info(trans, root, | |
6269 | path->nodes[level]->start, | |
6270 | path->nodes[level]->len, | |
6271 | &wc->refs[level], | |
6272 | &wc->flags[level]); | |
6273 | BUG_ON(ret); | |
6274 | BUG_ON(wc->refs[level] == 0); | |
6275 | ||
6276 | if (level == root_item->drop_level) | |
6277 | break; | |
6278 | ||
6279 | btrfs_tree_unlock(path->nodes[level]); | |
6280 | WARN_ON(wc->refs[level] != 1); | |
6281 | level--; | |
6282 | } | |
9f3a7427 | 6283 | } |
2c47e605 YZ |
6284 | |
6285 | wc->level = level; | |
6286 | wc->shared_level = -1; | |
6287 | wc->stage = DROP_REFERENCE; | |
6288 | wc->update_ref = update_ref; | |
6289 | wc->keep_locks = 0; | |
1c4850e2 | 6290 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 6291 | |
d397712b | 6292 | while (1) { |
2c47e605 YZ |
6293 | ret = walk_down_tree(trans, root, path, wc); |
6294 | if (ret < 0) { | |
6295 | err = ret; | |
20524f02 | 6296 | break; |
2c47e605 | 6297 | } |
9aca1d51 | 6298 | |
2c47e605 YZ |
6299 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
6300 | if (ret < 0) { | |
6301 | err = ret; | |
20524f02 | 6302 | break; |
2c47e605 YZ |
6303 | } |
6304 | ||
6305 | if (ret > 0) { | |
6306 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
6307 | break; |
6308 | } | |
2c47e605 YZ |
6309 | |
6310 | if (wc->stage == DROP_REFERENCE) { | |
6311 | level = wc->level; | |
6312 | btrfs_node_key(path->nodes[level], | |
6313 | &root_item->drop_progress, | |
6314 | path->slots[level]); | |
6315 | root_item->drop_level = level; | |
6316 | } | |
6317 | ||
6318 | BUG_ON(wc->level == 0); | |
3fd0a558 | 6319 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
6320 | ret = btrfs_update_root(trans, tree_root, |
6321 | &root->root_key, | |
6322 | root_item); | |
6323 | BUG_ON(ret); | |
6324 | ||
3fd0a558 | 6325 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 6326 | trans = btrfs_start_transaction(tree_root, 0); |
3fd0a558 YZ |
6327 | if (block_rsv) |
6328 | trans->block_rsv = block_rsv; | |
c3e69d58 | 6329 | } |
20524f02 | 6330 | } |
2c47e605 YZ |
6331 | btrfs_release_path(root, path); |
6332 | BUG_ON(err); | |
6333 | ||
6334 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
6335 | BUG_ON(ret); | |
6336 | ||
76dda93c YZ |
6337 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
6338 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
6339 | NULL, NULL); | |
6340 | BUG_ON(ret < 0); | |
6341 | if (ret > 0) { | |
84cd948c JB |
6342 | /* if we fail to delete the orphan item this time |
6343 | * around, it'll get picked up the next time. | |
6344 | * | |
6345 | * The most common failure here is just -ENOENT. | |
6346 | */ | |
6347 | btrfs_del_orphan_item(trans, tree_root, | |
6348 | root->root_key.objectid); | |
76dda93c YZ |
6349 | } |
6350 | } | |
6351 | ||
6352 | if (root->in_radix) { | |
6353 | btrfs_free_fs_root(tree_root->fs_info, root); | |
6354 | } else { | |
6355 | free_extent_buffer(root->node); | |
6356 | free_extent_buffer(root->commit_root); | |
6357 | kfree(root); | |
6358 | } | |
9f3a7427 | 6359 | out: |
3fd0a558 | 6360 | btrfs_end_transaction_throttle(trans, tree_root); |
2c47e605 | 6361 | kfree(wc); |
5caf2a00 | 6362 | btrfs_free_path(path); |
2c47e605 | 6363 | return err; |
20524f02 | 6364 | } |
9078a3e1 | 6365 | |
2c47e605 YZ |
6366 | /* |
6367 | * drop subtree rooted at tree block 'node'. | |
6368 | * | |
6369 | * NOTE: this function will unlock and release tree block 'node' | |
6370 | */ | |
f82d02d9 YZ |
6371 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
6372 | struct btrfs_root *root, | |
6373 | struct extent_buffer *node, | |
6374 | struct extent_buffer *parent) | |
6375 | { | |
6376 | struct btrfs_path *path; | |
2c47e605 | 6377 | struct walk_control *wc; |
f82d02d9 YZ |
6378 | int level; |
6379 | int parent_level; | |
6380 | int ret = 0; | |
6381 | int wret; | |
6382 | ||
2c47e605 YZ |
6383 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
6384 | ||
f82d02d9 YZ |
6385 | path = btrfs_alloc_path(); |
6386 | BUG_ON(!path); | |
6387 | ||
2c47e605 YZ |
6388 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
6389 | BUG_ON(!wc); | |
6390 | ||
b9447ef8 | 6391 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
6392 | parent_level = btrfs_header_level(parent); |
6393 | extent_buffer_get(parent); | |
6394 | path->nodes[parent_level] = parent; | |
6395 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
6396 | ||
b9447ef8 | 6397 | btrfs_assert_tree_locked(node); |
f82d02d9 | 6398 | level = btrfs_header_level(node); |
f82d02d9 YZ |
6399 | path->nodes[level] = node; |
6400 | path->slots[level] = 0; | |
2c47e605 YZ |
6401 | path->locks[level] = 1; |
6402 | ||
6403 | wc->refs[parent_level] = 1; | |
6404 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6405 | wc->level = level; | |
6406 | wc->shared_level = -1; | |
6407 | wc->stage = DROP_REFERENCE; | |
6408 | wc->update_ref = 0; | |
6409 | wc->keep_locks = 1; | |
1c4850e2 | 6410 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
6411 | |
6412 | while (1) { | |
2c47e605 YZ |
6413 | wret = walk_down_tree(trans, root, path, wc); |
6414 | if (wret < 0) { | |
f82d02d9 | 6415 | ret = wret; |
f82d02d9 | 6416 | break; |
2c47e605 | 6417 | } |
f82d02d9 | 6418 | |
2c47e605 | 6419 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
6420 | if (wret < 0) |
6421 | ret = wret; | |
6422 | if (wret != 0) | |
6423 | break; | |
6424 | } | |
6425 | ||
2c47e605 | 6426 | kfree(wc); |
f82d02d9 YZ |
6427 | btrfs_free_path(path); |
6428 | return ret; | |
6429 | } | |
6430 | ||
5d4f98a2 | 6431 | #if 0 |
8e7bf94f CM |
6432 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
6433 | unsigned long nr) | |
6434 | { | |
6435 | return min(last, start + nr - 1); | |
6436 | } | |
6437 | ||
d397712b | 6438 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
98ed5174 | 6439 | u64 len) |
edbd8d4e CM |
6440 | { |
6441 | u64 page_start; | |
6442 | u64 page_end; | |
1a40e23b | 6443 | unsigned long first_index; |
edbd8d4e | 6444 | unsigned long last_index; |
edbd8d4e CM |
6445 | unsigned long i; |
6446 | struct page *page; | |
d1310b2e | 6447 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 6448 | struct file_ra_state *ra; |
3eaa2885 | 6449 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
6450 | unsigned int total_read = 0; |
6451 | unsigned int total_dirty = 0; | |
6452 | int ret = 0; | |
4313b399 CM |
6453 | |
6454 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
6455 | |
6456 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 6457 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
6458 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
6459 | ||
1a40e23b ZY |
6460 | /* make sure the dirty trick played by the caller work */ |
6461 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
6462 | first_index, last_index); | |
6463 | if (ret) | |
6464 | goto out_unlock; | |
8e7bf94f | 6465 | |
4313b399 | 6466 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 6467 | |
1a40e23b ZY |
6468 | for (i = first_index ; i <= last_index; i++) { |
6469 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 6470 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 6471 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
6472 | } |
6473 | total_read++; | |
3eaa2885 CM |
6474 | again: |
6475 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 6476 | BUG_ON(1); |
edbd8d4e | 6477 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 6478 | if (!page) { |
1a40e23b | 6479 | ret = -ENOMEM; |
edbd8d4e | 6480 | goto out_unlock; |
a061fc8d | 6481 | } |
edbd8d4e CM |
6482 | if (!PageUptodate(page)) { |
6483 | btrfs_readpage(NULL, page); | |
6484 | lock_page(page); | |
6485 | if (!PageUptodate(page)) { | |
6486 | unlock_page(page); | |
6487 | page_cache_release(page); | |
1a40e23b | 6488 | ret = -EIO; |
edbd8d4e CM |
6489 | goto out_unlock; |
6490 | } | |
6491 | } | |
ec44a35c | 6492 | wait_on_page_writeback(page); |
3eaa2885 | 6493 | |
edbd8d4e CM |
6494 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
6495 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 6496 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 6497 | |
3eaa2885 CM |
6498 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
6499 | if (ordered) { | |
6500 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
6501 | unlock_page(page); | |
6502 | page_cache_release(page); | |
6503 | btrfs_start_ordered_extent(inode, ordered, 1); | |
6504 | btrfs_put_ordered_extent(ordered); | |
6505 | goto again; | |
6506 | } | |
6507 | set_page_extent_mapped(page); | |
6508 | ||
1a40e23b ZY |
6509 | if (i == first_index) |
6510 | set_extent_bits(io_tree, page_start, page_end, | |
6511 | EXTENT_BOUNDARY, GFP_NOFS); | |
1f80e4db | 6512 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b | 6513 | |
a061fc8d | 6514 | set_page_dirty(page); |
1a40e23b | 6515 | total_dirty++; |
edbd8d4e | 6516 | |
d1310b2e | 6517 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
6518 | unlock_page(page); |
6519 | page_cache_release(page); | |
6520 | } | |
6521 | ||
6522 | out_unlock: | |
ec44a35c | 6523 | kfree(ra); |
edbd8d4e | 6524 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
6525 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
6526 | return ret; | |
edbd8d4e CM |
6527 | } |
6528 | ||
d397712b | 6529 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
1a40e23b ZY |
6530 | struct btrfs_key *extent_key, |
6531 | u64 offset) | |
6532 | { | |
6533 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
6534 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
6535 | struct extent_map *em; | |
6643558d YZ |
6536 | u64 start = extent_key->objectid - offset; |
6537 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 6538 | |
1a40e23b ZY |
6539 | em = alloc_extent_map(GFP_NOFS); |
6540 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 6541 | |
6643558d | 6542 | em->start = start; |
1a40e23b | 6543 | em->len = extent_key->offset; |
c8b97818 | 6544 | em->block_len = extent_key->offset; |
1a40e23b ZY |
6545 | em->block_start = extent_key->objectid; |
6546 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
6547 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
6548 | ||
6549 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 6550 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
6551 | while (1) { |
6552 | int ret; | |
890871be | 6553 | write_lock(&em_tree->lock); |
1a40e23b | 6554 | ret = add_extent_mapping(em_tree, em); |
890871be | 6555 | write_unlock(&em_tree->lock); |
1a40e23b ZY |
6556 | if (ret != -EEXIST) { |
6557 | free_extent_map(em); | |
bf4ef679 CM |
6558 | break; |
6559 | } | |
6643558d | 6560 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 6561 | } |
6643558d | 6562 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 6563 | |
6643558d | 6564 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 6565 | } |
edbd8d4e | 6566 | |
1a40e23b ZY |
6567 | struct btrfs_ref_path { |
6568 | u64 extent_start; | |
6569 | u64 nodes[BTRFS_MAX_LEVEL]; | |
6570 | u64 root_objectid; | |
6571 | u64 root_generation; | |
6572 | u64 owner_objectid; | |
1a40e23b ZY |
6573 | u32 num_refs; |
6574 | int lowest_level; | |
6575 | int current_level; | |
f82d02d9 YZ |
6576 | int shared_level; |
6577 | ||
6578 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
6579 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 6580 | }; |
7d9eb12c | 6581 | |
1a40e23b | 6582 | struct disk_extent { |
c8b97818 | 6583 | u64 ram_bytes; |
1a40e23b ZY |
6584 | u64 disk_bytenr; |
6585 | u64 disk_num_bytes; | |
6586 | u64 offset; | |
6587 | u64 num_bytes; | |
c8b97818 CM |
6588 | u8 compression; |
6589 | u8 encryption; | |
6590 | u16 other_encoding; | |
1a40e23b | 6591 | }; |
4313b399 | 6592 | |
1a40e23b ZY |
6593 | static int is_cowonly_root(u64 root_objectid) |
6594 | { | |
6595 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
6596 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
6597 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
6598 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
0403e47e YZ |
6599 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
6600 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1a40e23b ZY |
6601 | return 1; |
6602 | return 0; | |
6603 | } | |
edbd8d4e | 6604 | |
d397712b | 6605 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6606 | struct btrfs_root *extent_root, |
6607 | struct btrfs_ref_path *ref_path, | |
6608 | int first_time) | |
6609 | { | |
6610 | struct extent_buffer *leaf; | |
6611 | struct btrfs_path *path; | |
6612 | struct btrfs_extent_ref *ref; | |
6613 | struct btrfs_key key; | |
6614 | struct btrfs_key found_key; | |
6615 | u64 bytenr; | |
6616 | u32 nritems; | |
6617 | int level; | |
6618 | int ret = 1; | |
edbd8d4e | 6619 | |
1a40e23b ZY |
6620 | path = btrfs_alloc_path(); |
6621 | if (!path) | |
6622 | return -ENOMEM; | |
bf4ef679 | 6623 | |
1a40e23b ZY |
6624 | if (first_time) { |
6625 | ref_path->lowest_level = -1; | |
6626 | ref_path->current_level = -1; | |
f82d02d9 | 6627 | ref_path->shared_level = -1; |
1a40e23b ZY |
6628 | goto walk_up; |
6629 | } | |
6630 | walk_down: | |
6631 | level = ref_path->current_level - 1; | |
6632 | while (level >= -1) { | |
6633 | u64 parent; | |
6634 | if (level < ref_path->lowest_level) | |
6635 | break; | |
bf4ef679 | 6636 | |
d397712b | 6637 | if (level >= 0) |
1a40e23b | 6638 | bytenr = ref_path->nodes[level]; |
d397712b | 6639 | else |
1a40e23b | 6640 | bytenr = ref_path->extent_start; |
1a40e23b | 6641 | BUG_ON(bytenr == 0); |
bf4ef679 | 6642 | |
1a40e23b ZY |
6643 | parent = ref_path->nodes[level + 1]; |
6644 | ref_path->nodes[level + 1] = 0; | |
6645 | ref_path->current_level = level; | |
6646 | BUG_ON(parent == 0); | |
0ef3e66b | 6647 | |
1a40e23b ZY |
6648 | key.objectid = bytenr; |
6649 | key.offset = parent + 1; | |
6650 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 6651 | |
1a40e23b ZY |
6652 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
6653 | if (ret < 0) | |
edbd8d4e | 6654 | goto out; |
1a40e23b | 6655 | BUG_ON(ret == 0); |
7d9eb12c | 6656 | |
1a40e23b ZY |
6657 | leaf = path->nodes[0]; |
6658 | nritems = btrfs_header_nritems(leaf); | |
6659 | if (path->slots[0] >= nritems) { | |
6660 | ret = btrfs_next_leaf(extent_root, path); | |
6661 | if (ret < 0) | |
6662 | goto out; | |
6663 | if (ret > 0) | |
6664 | goto next; | |
6665 | leaf = path->nodes[0]; | |
6666 | } | |
0ef3e66b | 6667 | |
1a40e23b ZY |
6668 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6669 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
6670 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
6671 | if (level < ref_path->shared_level) | |
6672 | ref_path->shared_level = level; | |
1a40e23b | 6673 | goto found; |
f82d02d9 | 6674 | } |
1a40e23b ZY |
6675 | next: |
6676 | level--; | |
6677 | btrfs_release_path(extent_root, path); | |
d899e052 | 6678 | cond_resched(); |
1a40e23b ZY |
6679 | } |
6680 | /* reached lowest level */ | |
6681 | ret = 1; | |
6682 | goto out; | |
6683 | walk_up: | |
6684 | level = ref_path->current_level; | |
6685 | while (level < BTRFS_MAX_LEVEL - 1) { | |
6686 | u64 ref_objectid; | |
d397712b CM |
6687 | |
6688 | if (level >= 0) | |
1a40e23b | 6689 | bytenr = ref_path->nodes[level]; |
d397712b | 6690 | else |
1a40e23b | 6691 | bytenr = ref_path->extent_start; |
d397712b | 6692 | |
1a40e23b | 6693 | BUG_ON(bytenr == 0); |
edbd8d4e | 6694 | |
1a40e23b ZY |
6695 | key.objectid = bytenr; |
6696 | key.offset = 0; | |
6697 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 6698 | |
1a40e23b ZY |
6699 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
6700 | if (ret < 0) | |
6701 | goto out; | |
edbd8d4e | 6702 | |
1a40e23b ZY |
6703 | leaf = path->nodes[0]; |
6704 | nritems = btrfs_header_nritems(leaf); | |
6705 | if (path->slots[0] >= nritems) { | |
6706 | ret = btrfs_next_leaf(extent_root, path); | |
6707 | if (ret < 0) | |
6708 | goto out; | |
6709 | if (ret > 0) { | |
6710 | /* the extent was freed by someone */ | |
6711 | if (ref_path->lowest_level == level) | |
6712 | goto out; | |
6713 | btrfs_release_path(extent_root, path); | |
6714 | goto walk_down; | |
6715 | } | |
6716 | leaf = path->nodes[0]; | |
6717 | } | |
edbd8d4e | 6718 | |
1a40e23b ZY |
6719 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6720 | if (found_key.objectid != bytenr || | |
6721 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
6722 | /* the extent was freed by someone */ | |
6723 | if (ref_path->lowest_level == level) { | |
6724 | ret = 1; | |
6725 | goto out; | |
6726 | } | |
6727 | btrfs_release_path(extent_root, path); | |
6728 | goto walk_down; | |
6729 | } | |
6730 | found: | |
6731 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
6732 | struct btrfs_extent_ref); | |
6733 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
6734 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
6735 | if (first_time) { | |
6736 | level = (int)ref_objectid; | |
6737 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
6738 | ref_path->lowest_level = level; | |
6739 | ref_path->current_level = level; | |
6740 | ref_path->nodes[level] = bytenr; | |
6741 | } else { | |
6742 | WARN_ON(ref_objectid != level); | |
6743 | } | |
6744 | } else { | |
6745 | WARN_ON(level != -1); | |
6746 | } | |
6747 | first_time = 0; | |
bf4ef679 | 6748 | |
1a40e23b ZY |
6749 | if (ref_path->lowest_level == level) { |
6750 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
6751 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
6752 | } | |
bf4ef679 | 6753 | |
7d9eb12c | 6754 | /* |
1a40e23b ZY |
6755 | * the block is tree root or the block isn't in reference |
6756 | * counted tree. | |
7d9eb12c | 6757 | */ |
1a40e23b ZY |
6758 | if (found_key.objectid == found_key.offset || |
6759 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
6760 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
6761 | ref_path->root_generation = | |
6762 | btrfs_ref_generation(leaf, ref); | |
6763 | if (level < 0) { | |
6764 | /* special reference from the tree log */ | |
6765 | ref_path->nodes[0] = found_key.offset; | |
6766 | ref_path->current_level = 0; | |
6767 | } | |
6768 | ret = 0; | |
6769 | goto out; | |
6770 | } | |
7d9eb12c | 6771 | |
1a40e23b ZY |
6772 | level++; |
6773 | BUG_ON(ref_path->nodes[level] != 0); | |
6774 | ref_path->nodes[level] = found_key.offset; | |
6775 | ref_path->current_level = level; | |
bf4ef679 | 6776 | |
1a40e23b ZY |
6777 | /* |
6778 | * the reference was created in the running transaction, | |
6779 | * no need to continue walking up. | |
6780 | */ | |
6781 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
6782 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
6783 | ref_path->root_generation = | |
6784 | btrfs_ref_generation(leaf, ref); | |
6785 | ret = 0; | |
6786 | goto out; | |
7d9eb12c CM |
6787 | } |
6788 | ||
1a40e23b | 6789 | btrfs_release_path(extent_root, path); |
d899e052 | 6790 | cond_resched(); |
7d9eb12c | 6791 | } |
1a40e23b ZY |
6792 | /* reached max tree level, but no tree root found. */ |
6793 | BUG(); | |
edbd8d4e | 6794 | out: |
1a40e23b ZY |
6795 | btrfs_free_path(path); |
6796 | return ret; | |
edbd8d4e CM |
6797 | } |
6798 | ||
1a40e23b ZY |
6799 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
6800 | struct btrfs_root *extent_root, | |
6801 | struct btrfs_ref_path *ref_path, | |
6802 | u64 extent_start) | |
a061fc8d | 6803 | { |
1a40e23b ZY |
6804 | memset(ref_path, 0, sizeof(*ref_path)); |
6805 | ref_path->extent_start = extent_start; | |
a061fc8d | 6806 | |
1a40e23b | 6807 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
6808 | } |
6809 | ||
1a40e23b ZY |
6810 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
6811 | struct btrfs_root *extent_root, | |
6812 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 6813 | { |
1a40e23b ZY |
6814 | return __next_ref_path(trans, extent_root, ref_path, 0); |
6815 | } | |
6816 | ||
d397712b | 6817 | static noinline int get_new_locations(struct inode *reloc_inode, |
1a40e23b ZY |
6818 | struct btrfs_key *extent_key, |
6819 | u64 offset, int no_fragment, | |
6820 | struct disk_extent **extents, | |
6821 | int *nr_extents) | |
6822 | { | |
6823 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
6824 | struct btrfs_path *path; | |
6825 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 6826 | struct extent_buffer *leaf; |
1a40e23b ZY |
6827 | struct disk_extent *exts = *extents; |
6828 | struct btrfs_key found_key; | |
6829 | u64 cur_pos; | |
6830 | u64 last_byte; | |
edbd8d4e | 6831 | u32 nritems; |
1a40e23b ZY |
6832 | int nr = 0; |
6833 | int max = *nr_extents; | |
6834 | int ret; | |
edbd8d4e | 6835 | |
1a40e23b ZY |
6836 | WARN_ON(!no_fragment && *extents); |
6837 | if (!exts) { | |
6838 | max = 1; | |
6839 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
6840 | if (!exts) | |
6841 | return -ENOMEM; | |
a061fc8d | 6842 | } |
edbd8d4e | 6843 | |
1a40e23b ZY |
6844 | path = btrfs_alloc_path(); |
6845 | BUG_ON(!path); | |
edbd8d4e | 6846 | |
1a40e23b ZY |
6847 | cur_pos = extent_key->objectid - offset; |
6848 | last_byte = extent_key->objectid + extent_key->offset; | |
6849 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
6850 | cur_pos, 0); | |
6851 | if (ret < 0) | |
6852 | goto out; | |
6853 | if (ret > 0) { | |
6854 | ret = -ENOENT; | |
6855 | goto out; | |
6856 | } | |
edbd8d4e | 6857 | |
1a40e23b | 6858 | while (1) { |
edbd8d4e CM |
6859 | leaf = path->nodes[0]; |
6860 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
6861 | if (path->slots[0] >= nritems) { |
6862 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
6863 | if (ret < 0) |
6864 | goto out; | |
1a40e23b ZY |
6865 | if (ret > 0) |
6866 | break; | |
bf4ef679 | 6867 | leaf = path->nodes[0]; |
a061fc8d | 6868 | } |
edbd8d4e CM |
6869 | |
6870 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
6871 | if (found_key.offset != cur_pos || |
6872 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
6873 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
6874 | break; |
6875 | ||
1a40e23b ZY |
6876 | fi = btrfs_item_ptr(leaf, path->slots[0], |
6877 | struct btrfs_file_extent_item); | |
6878 | if (btrfs_file_extent_type(leaf, fi) != | |
6879 | BTRFS_FILE_EXTENT_REG || | |
6880 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 6881 | break; |
1a40e23b ZY |
6882 | |
6883 | if (nr == max) { | |
6884 | struct disk_extent *old = exts; | |
6885 | max *= 2; | |
6886 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
6887 | memcpy(exts, old, sizeof(*exts) * nr); | |
6888 | if (old != *extents) | |
6889 | kfree(old); | |
a061fc8d | 6890 | } |
edbd8d4e | 6891 | |
1a40e23b ZY |
6892 | exts[nr].disk_bytenr = |
6893 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
6894 | exts[nr].disk_num_bytes = | |
6895 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
6896 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
6897 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
6898 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
6899 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
6900 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
6901 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
6902 | fi); | |
d899e052 YZ |
6903 | BUG_ON(exts[nr].offset > 0); |
6904 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
6905 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 6906 | |
1a40e23b ZY |
6907 | cur_pos += exts[nr].num_bytes; |
6908 | nr++; | |
6909 | ||
6910 | if (cur_pos + offset >= last_byte) | |
6911 | break; | |
6912 | ||
6913 | if (no_fragment) { | |
6914 | ret = 1; | |
edbd8d4e | 6915 | goto out; |
1a40e23b ZY |
6916 | } |
6917 | path->slots[0]++; | |
6918 | } | |
6919 | ||
1f80e4db | 6920 | BUG_ON(cur_pos + offset > last_byte); |
1a40e23b ZY |
6921 | if (cur_pos + offset < last_byte) { |
6922 | ret = -ENOENT; | |
6923 | goto out; | |
edbd8d4e CM |
6924 | } |
6925 | ret = 0; | |
6926 | out: | |
1a40e23b ZY |
6927 | btrfs_free_path(path); |
6928 | if (ret) { | |
6929 | if (exts != *extents) | |
6930 | kfree(exts); | |
6931 | } else { | |
6932 | *extents = exts; | |
6933 | *nr_extents = nr; | |
6934 | } | |
6935 | return ret; | |
6936 | } | |
6937 | ||
d397712b | 6938 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6939 | struct btrfs_root *root, |
6940 | struct btrfs_path *path, | |
6941 | struct btrfs_key *extent_key, | |
6942 | struct btrfs_key *leaf_key, | |
6943 | struct btrfs_ref_path *ref_path, | |
6944 | struct disk_extent *new_extents, | |
6945 | int nr_extents) | |
6946 | { | |
6947 | struct extent_buffer *leaf; | |
6948 | struct btrfs_file_extent_item *fi; | |
6949 | struct inode *inode = NULL; | |
6950 | struct btrfs_key key; | |
6951 | u64 lock_start = 0; | |
6952 | u64 lock_end = 0; | |
6953 | u64 num_bytes; | |
6954 | u64 ext_offset; | |
86288a19 | 6955 | u64 search_end = (u64)-1; |
1a40e23b | 6956 | u32 nritems; |
3bb1a1bc | 6957 | int nr_scaned = 0; |
1a40e23b | 6958 | int extent_locked = 0; |
d899e052 | 6959 | int extent_type; |
1a40e23b ZY |
6960 | int ret; |
6961 | ||
3bb1a1bc | 6962 | memcpy(&key, leaf_key, sizeof(key)); |
1a40e23b | 6963 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
6964 | if (key.objectid < ref_path->owner_objectid || |
6965 | (key.objectid == ref_path->owner_objectid && | |
6966 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
6967 | key.objectid = ref_path->owner_objectid; | |
6968 | key.type = BTRFS_EXTENT_DATA_KEY; | |
6969 | key.offset = 0; | |
6970 | } | |
1a40e23b ZY |
6971 | } |
6972 | ||
6973 | while (1) { | |
6974 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
6975 | if (ret < 0) | |
6976 | goto out; | |
6977 | ||
6978 | leaf = path->nodes[0]; | |
6979 | nritems = btrfs_header_nritems(leaf); | |
6980 | next: | |
6981 | if (extent_locked && ret > 0) { | |
6982 | /* | |
6983 | * the file extent item was modified by someone | |
6984 | * before the extent got locked. | |
6985 | */ | |
1a40e23b ZY |
6986 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6987 | lock_end, GFP_NOFS); | |
6988 | extent_locked = 0; | |
6989 | } | |
6990 | ||
6991 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 6992 | if (++nr_scaned > 2) |
1a40e23b ZY |
6993 | break; |
6994 | ||
6995 | BUG_ON(extent_locked); | |
6996 | ret = btrfs_next_leaf(root, path); | |
6997 | if (ret < 0) | |
6998 | goto out; | |
6999 | if (ret > 0) | |
7000 | break; | |
7001 | leaf = path->nodes[0]; | |
7002 | nritems = btrfs_header_nritems(leaf); | |
7003 | } | |
7004 | ||
7005 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
7006 | ||
7007 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
7008 | if ((key.objectid > ref_path->owner_objectid) || | |
7009 | (key.objectid == ref_path->owner_objectid && | |
7010 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
86288a19 | 7011 | key.offset >= search_end) |
1a40e23b ZY |
7012 | break; |
7013 | } | |
7014 | ||
7015 | if (inode && key.objectid != inode->i_ino) { | |
7016 | BUG_ON(extent_locked); | |
7017 | btrfs_release_path(root, path); | |
7018 | mutex_unlock(&inode->i_mutex); | |
7019 | iput(inode); | |
7020 | inode = NULL; | |
7021 | continue; | |
7022 | } | |
7023 | ||
7024 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
7025 | path->slots[0]++; | |
7026 | ret = 1; | |
7027 | goto next; | |
7028 | } | |
7029 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
7030 | struct btrfs_file_extent_item); | |
d899e052 YZ |
7031 | extent_type = btrfs_file_extent_type(leaf, fi); |
7032 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
7033 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
7034 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
7035 | extent_key->objectid)) { | |
7036 | path->slots[0]++; | |
7037 | ret = 1; | |
7038 | goto next; | |
7039 | } | |
7040 | ||
7041 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
7042 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
7043 | ||
86288a19 YZ |
7044 | if (search_end == (u64)-1) { |
7045 | search_end = key.offset - ext_offset + | |
7046 | btrfs_file_extent_ram_bytes(leaf, fi); | |
7047 | } | |
1a40e23b ZY |
7048 | |
7049 | if (!extent_locked) { | |
7050 | lock_start = key.offset; | |
7051 | lock_end = lock_start + num_bytes - 1; | |
7052 | } else { | |
6643558d YZ |
7053 | if (lock_start > key.offset || |
7054 | lock_end + 1 < key.offset + num_bytes) { | |
7055 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
7056 | lock_start, lock_end, GFP_NOFS); | |
7057 | extent_locked = 0; | |
7058 | } | |
1a40e23b ZY |
7059 | } |
7060 | ||
7061 | if (!inode) { | |
7062 | btrfs_release_path(root, path); | |
7063 | ||
7064 | inode = btrfs_iget_locked(root->fs_info->sb, | |
7065 | key.objectid, root); | |
7066 | if (inode->i_state & I_NEW) { | |
7067 | BTRFS_I(inode)->root = root; | |
7068 | BTRFS_I(inode)->location.objectid = | |
7069 | key.objectid; | |
7070 | BTRFS_I(inode)->location.type = | |
7071 | BTRFS_INODE_ITEM_KEY; | |
7072 | BTRFS_I(inode)->location.offset = 0; | |
7073 | btrfs_read_locked_inode(inode); | |
7074 | unlock_new_inode(inode); | |
7075 | } | |
7076 | /* | |
7077 | * some code call btrfs_commit_transaction while | |
7078 | * holding the i_mutex, so we can't use mutex_lock | |
7079 | * here. | |
7080 | */ | |
7081 | if (is_bad_inode(inode) || | |
7082 | !mutex_trylock(&inode->i_mutex)) { | |
7083 | iput(inode); | |
7084 | inode = NULL; | |
7085 | key.offset = (u64)-1; | |
7086 | goto skip; | |
7087 | } | |
7088 | } | |
7089 | ||
7090 | if (!extent_locked) { | |
7091 | struct btrfs_ordered_extent *ordered; | |
7092 | ||
7093 | btrfs_release_path(root, path); | |
7094 | ||
7095 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
7096 | lock_end, GFP_NOFS); | |
7097 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
7098 | lock_end); | |
7099 | if (ordered && | |
7100 | ordered->file_offset <= lock_end && | |
7101 | ordered->file_offset + ordered->len > lock_start) { | |
7102 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
7103 | lock_start, lock_end, GFP_NOFS); | |
7104 | btrfs_start_ordered_extent(inode, ordered, 1); | |
7105 | btrfs_put_ordered_extent(ordered); | |
7106 | key.offset += num_bytes; | |
7107 | goto skip; | |
7108 | } | |
7109 | if (ordered) | |
7110 | btrfs_put_ordered_extent(ordered); | |
7111 | ||
1a40e23b ZY |
7112 | extent_locked = 1; |
7113 | continue; | |
7114 | } | |
7115 | ||
7116 | if (nr_extents == 1) { | |
7117 | /* update extent pointer in place */ | |
1a40e23b ZY |
7118 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
7119 | new_extents[0].disk_bytenr); | |
7120 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
7121 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
7122 | btrfs_mark_buffer_dirty(leaf); |
7123 | ||
7124 | btrfs_drop_extent_cache(inode, key.offset, | |
7125 | key.offset + num_bytes - 1, 0); | |
7126 | ||
7127 | ret = btrfs_inc_extent_ref(trans, root, | |
7128 | new_extents[0].disk_bytenr, | |
7129 | new_extents[0].disk_num_bytes, | |
7130 | leaf->start, | |
7131 | root->root_key.objectid, | |
7132 | trans->transid, | |
3bb1a1bc | 7133 | key.objectid); |
1a40e23b ZY |
7134 | BUG_ON(ret); |
7135 | ||
7136 | ret = btrfs_free_extent(trans, root, | |
7137 | extent_key->objectid, | |
7138 | extent_key->offset, | |
7139 | leaf->start, | |
7140 | btrfs_header_owner(leaf), | |
7141 | btrfs_header_generation(leaf), | |
3bb1a1bc | 7142 | key.objectid, 0); |
1a40e23b ZY |
7143 | BUG_ON(ret); |
7144 | ||
7145 | btrfs_release_path(root, path); | |
7146 | key.offset += num_bytes; | |
7147 | } else { | |
d899e052 YZ |
7148 | BUG_ON(1); |
7149 | #if 0 | |
1a40e23b ZY |
7150 | u64 alloc_hint; |
7151 | u64 extent_len; | |
7152 | int i; | |
7153 | /* | |
7154 | * drop old extent pointer at first, then insert the | |
7155 | * new pointers one bye one | |
7156 | */ | |
7157 | btrfs_release_path(root, path); | |
7158 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
7159 | key.offset + num_bytes, | |
7160 | key.offset, &alloc_hint); | |
7161 | BUG_ON(ret); | |
7162 | ||
7163 | for (i = 0; i < nr_extents; i++) { | |
7164 | if (ext_offset >= new_extents[i].num_bytes) { | |
7165 | ext_offset -= new_extents[i].num_bytes; | |
7166 | continue; | |
7167 | } | |
7168 | extent_len = min(new_extents[i].num_bytes - | |
7169 | ext_offset, num_bytes); | |
7170 | ||
7171 | ret = btrfs_insert_empty_item(trans, root, | |
7172 | path, &key, | |
7173 | sizeof(*fi)); | |
7174 | BUG_ON(ret); | |
7175 | ||
7176 | leaf = path->nodes[0]; | |
7177 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
7178 | struct btrfs_file_extent_item); | |
7179 | btrfs_set_file_extent_generation(leaf, fi, | |
7180 | trans->transid); | |
7181 | btrfs_set_file_extent_type(leaf, fi, | |
7182 | BTRFS_FILE_EXTENT_REG); | |
7183 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
7184 | new_extents[i].disk_bytenr); | |
7185 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
7186 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
7187 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
7188 | new_extents[i].ram_bytes); | |
7189 | ||
7190 | btrfs_set_file_extent_compression(leaf, fi, | |
7191 | new_extents[i].compression); | |
7192 | btrfs_set_file_extent_encryption(leaf, fi, | |
7193 | new_extents[i].encryption); | |
7194 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
7195 | new_extents[i].other_encoding); | |
7196 | ||
1a40e23b ZY |
7197 | btrfs_set_file_extent_num_bytes(leaf, fi, |
7198 | extent_len); | |
7199 | ext_offset += new_extents[i].offset; | |
7200 | btrfs_set_file_extent_offset(leaf, fi, | |
7201 | ext_offset); | |
7202 | btrfs_mark_buffer_dirty(leaf); | |
7203 | ||
7204 | btrfs_drop_extent_cache(inode, key.offset, | |
7205 | key.offset + extent_len - 1, 0); | |
7206 | ||
7207 | ret = btrfs_inc_extent_ref(trans, root, | |
7208 | new_extents[i].disk_bytenr, | |
7209 | new_extents[i].disk_num_bytes, | |
7210 | leaf->start, | |
7211 | root->root_key.objectid, | |
3bb1a1bc | 7212 | trans->transid, key.objectid); |
1a40e23b ZY |
7213 | BUG_ON(ret); |
7214 | btrfs_release_path(root, path); | |
7215 | ||
a76a3cd4 | 7216 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
7217 | |
7218 | ext_offset = 0; | |
7219 | num_bytes -= extent_len; | |
7220 | key.offset += extent_len; | |
7221 | ||
7222 | if (num_bytes == 0) | |
7223 | break; | |
7224 | } | |
7225 | BUG_ON(i >= nr_extents); | |
d899e052 | 7226 | #endif |
1a40e23b ZY |
7227 | } |
7228 | ||
7229 | if (extent_locked) { | |
1a40e23b ZY |
7230 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
7231 | lock_end, GFP_NOFS); | |
7232 | extent_locked = 0; | |
7233 | } | |
7234 | skip: | |
7235 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
86288a19 | 7236 | key.offset >= search_end) |
1a40e23b ZY |
7237 | break; |
7238 | ||
7239 | cond_resched(); | |
7240 | } | |
7241 | ret = 0; | |
7242 | out: | |
7243 | btrfs_release_path(root, path); | |
7244 | if (inode) { | |
7245 | mutex_unlock(&inode->i_mutex); | |
7246 | if (extent_locked) { | |
1a40e23b ZY |
7247 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
7248 | lock_end, GFP_NOFS); | |
7249 | } | |
7250 | iput(inode); | |
7251 | } | |
7252 | return ret; | |
7253 | } | |
7254 | ||
1a40e23b ZY |
7255 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
7256 | struct btrfs_root *root, | |
7257 | struct extent_buffer *buf, u64 orig_start) | |
7258 | { | |
7259 | int level; | |
7260 | int ret; | |
7261 | ||
7262 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
7263 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
7264 | ||
7265 | level = btrfs_header_level(buf); | |
7266 | if (level == 0) { | |
7267 | struct btrfs_leaf_ref *ref; | |
7268 | struct btrfs_leaf_ref *orig_ref; | |
7269 | ||
7270 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
7271 | if (!orig_ref) | |
7272 | return -ENOENT; | |
7273 | ||
7274 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
7275 | if (!ref) { | |
7276 | btrfs_free_leaf_ref(root, orig_ref); | |
7277 | return -ENOMEM; | |
7278 | } | |
7279 | ||
7280 | ref->nritems = orig_ref->nritems; | |
7281 | memcpy(ref->extents, orig_ref->extents, | |
7282 | sizeof(ref->extents[0]) * ref->nritems); | |
7283 | ||
7284 | btrfs_free_leaf_ref(root, orig_ref); | |
7285 | ||
7286 | ref->root_gen = trans->transid; | |
7287 | ref->bytenr = buf->start; | |
7288 | ref->owner = btrfs_header_owner(buf); | |
7289 | ref->generation = btrfs_header_generation(buf); | |
bd56b302 | 7290 | |
1a40e23b ZY |
7291 | ret = btrfs_add_leaf_ref(root, ref, 0); |
7292 | WARN_ON(ret); | |
7293 | btrfs_free_leaf_ref(root, ref); | |
7294 | } | |
7295 | return 0; | |
7296 | } | |
7297 | ||
d397712b | 7298 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
1a40e23b ZY |
7299 | struct extent_buffer *leaf, |
7300 | struct btrfs_block_group_cache *group, | |
7301 | struct btrfs_root *target_root) | |
7302 | { | |
7303 | struct btrfs_key key; | |
7304 | struct inode *inode = NULL; | |
7305 | struct btrfs_file_extent_item *fi; | |
2ac55d41 | 7306 | struct extent_state *cached_state = NULL; |
1a40e23b ZY |
7307 | u64 num_bytes; |
7308 | u64 skip_objectid = 0; | |
7309 | u32 nritems; | |
7310 | u32 i; | |
7311 | ||
7312 | nritems = btrfs_header_nritems(leaf); | |
7313 | for (i = 0; i < nritems; i++) { | |
7314 | btrfs_item_key_to_cpu(leaf, &key, i); | |
7315 | if (key.objectid == skip_objectid || | |
7316 | key.type != BTRFS_EXTENT_DATA_KEY) | |
7317 | continue; | |
7318 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
7319 | if (btrfs_file_extent_type(leaf, fi) == | |
7320 | BTRFS_FILE_EXTENT_INLINE) | |
7321 | continue; | |
7322 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
7323 | continue; | |
7324 | if (!inode || inode->i_ino != key.objectid) { | |
7325 | iput(inode); | |
7326 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
7327 | key.objectid, target_root, 1); | |
7328 | } | |
7329 | if (!inode) { | |
7330 | skip_objectid = key.objectid; | |
7331 | continue; | |
7332 | } | |
7333 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
7334 | ||
2ac55d41 JB |
7335 | lock_extent_bits(&BTRFS_I(inode)->io_tree, key.offset, |
7336 | key.offset + num_bytes - 1, 0, &cached_state, | |
7337 | GFP_NOFS); | |
1a40e23b ZY |
7338 | btrfs_drop_extent_cache(inode, key.offset, |
7339 | key.offset + num_bytes - 1, 1); | |
2ac55d41 JB |
7340 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, key.offset, |
7341 | key.offset + num_bytes - 1, &cached_state, | |
7342 | GFP_NOFS); | |
1a40e23b ZY |
7343 | cond_resched(); |
7344 | } | |
7345 | iput(inode); | |
7346 | return 0; | |
7347 | } | |
7348 | ||
d397712b | 7349 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7350 | struct btrfs_root *root, |
7351 | struct extent_buffer *leaf, | |
7352 | struct btrfs_block_group_cache *group, | |
7353 | struct inode *reloc_inode) | |
7354 | { | |
7355 | struct btrfs_key key; | |
7356 | struct btrfs_key extent_key; | |
7357 | struct btrfs_file_extent_item *fi; | |
7358 | struct btrfs_leaf_ref *ref; | |
7359 | struct disk_extent *new_extent; | |
7360 | u64 bytenr; | |
7361 | u64 num_bytes; | |
7362 | u32 nritems; | |
7363 | u32 i; | |
7364 | int ext_index; | |
7365 | int nr_extent; | |
7366 | int ret; | |
7367 | ||
7368 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
7369 | BUG_ON(!new_extent); | |
7370 | ||
7371 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
7372 | BUG_ON(!ref); | |
7373 | ||
7374 | ext_index = -1; | |
7375 | nritems = btrfs_header_nritems(leaf); | |
7376 | for (i = 0; i < nritems; i++) { | |
7377 | btrfs_item_key_to_cpu(leaf, &key, i); | |
7378 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
7379 | continue; | |
7380 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
7381 | if (btrfs_file_extent_type(leaf, fi) == | |
7382 | BTRFS_FILE_EXTENT_INLINE) | |
7383 | continue; | |
7384 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
7385 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
7386 | if (bytenr == 0) | |
7387 | continue; | |
7388 | ||
7389 | ext_index++; | |
7390 | if (bytenr >= group->key.objectid + group->key.offset || | |
7391 | bytenr + num_bytes <= group->key.objectid) | |
7392 | continue; | |
7393 | ||
7394 | extent_key.objectid = bytenr; | |
7395 | extent_key.offset = num_bytes; | |
7396 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
7397 | nr_extent = 1; | |
7398 | ret = get_new_locations(reloc_inode, &extent_key, | |
7399 | group->key.objectid, 1, | |
7400 | &new_extent, &nr_extent); | |
7401 | if (ret > 0) | |
7402 | continue; | |
7403 | BUG_ON(ret < 0); | |
7404 | ||
7405 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
7406 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
7407 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
7408 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
7409 | ||
1a40e23b ZY |
7410 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
7411 | new_extent->disk_bytenr); | |
7412 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
7413 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
7414 | btrfs_mark_buffer_dirty(leaf); |
7415 | ||
7416 | ret = btrfs_inc_extent_ref(trans, root, | |
7417 | new_extent->disk_bytenr, | |
7418 | new_extent->disk_num_bytes, | |
7419 | leaf->start, | |
7420 | root->root_key.objectid, | |
3bb1a1bc | 7421 | trans->transid, key.objectid); |
1a40e23b | 7422 | BUG_ON(ret); |
56bec294 | 7423 | |
1a40e23b ZY |
7424 | ret = btrfs_free_extent(trans, root, |
7425 | bytenr, num_bytes, leaf->start, | |
7426 | btrfs_header_owner(leaf), | |
7427 | btrfs_header_generation(leaf), | |
3bb1a1bc | 7428 | key.objectid, 0); |
1a40e23b ZY |
7429 | BUG_ON(ret); |
7430 | cond_resched(); | |
7431 | } | |
7432 | kfree(new_extent); | |
7433 | BUG_ON(ext_index + 1 != ref->nritems); | |
7434 | btrfs_free_leaf_ref(root, ref); | |
7435 | return 0; | |
7436 | } | |
7437 | ||
f82d02d9 YZ |
7438 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
7439 | struct btrfs_root *root) | |
1a40e23b ZY |
7440 | { |
7441 | struct btrfs_root *reloc_root; | |
f82d02d9 | 7442 | int ret; |
1a40e23b ZY |
7443 | |
7444 | if (root->reloc_root) { | |
7445 | reloc_root = root->reloc_root; | |
7446 | root->reloc_root = NULL; | |
7447 | list_add(&reloc_root->dead_list, | |
7448 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
7449 | |
7450 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
7451 | reloc_root->node->start); | |
7452 | btrfs_set_root_level(&root->root_item, | |
7453 | btrfs_header_level(reloc_root->node)); | |
7454 | memset(&reloc_root->root_item.drop_progress, 0, | |
7455 | sizeof(struct btrfs_disk_key)); | |
7456 | reloc_root->root_item.drop_level = 0; | |
7457 | ||
7458 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
7459 | &reloc_root->root_key, | |
7460 | &reloc_root->root_item); | |
7461 | BUG_ON(ret); | |
1a40e23b ZY |
7462 | } |
7463 | return 0; | |
7464 | } | |
7465 | ||
7466 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
7467 | { | |
7468 | struct btrfs_trans_handle *trans; | |
7469 | struct btrfs_root *reloc_root; | |
7470 | struct btrfs_root *prev_root = NULL; | |
7471 | struct list_head dead_roots; | |
7472 | int ret; | |
7473 | unsigned long nr; | |
7474 | ||
7475 | INIT_LIST_HEAD(&dead_roots); | |
7476 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
7477 | ||
7478 | while (!list_empty(&dead_roots)) { | |
7479 | reloc_root = list_entry(dead_roots.prev, | |
7480 | struct btrfs_root, dead_list); | |
7481 | list_del_init(&reloc_root->dead_list); | |
7482 | ||
7483 | BUG_ON(reloc_root->commit_root != NULL); | |
7484 | while (1) { | |
7485 | trans = btrfs_join_transaction(root, 1); | |
7486 | BUG_ON(!trans); | |
7487 | ||
7488 | mutex_lock(&root->fs_info->drop_mutex); | |
7489 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
7490 | if (ret != -EAGAIN) | |
7491 | break; | |
7492 | mutex_unlock(&root->fs_info->drop_mutex); | |
7493 | ||
7494 | nr = trans->blocks_used; | |
7495 | ret = btrfs_end_transaction(trans, root); | |
7496 | BUG_ON(ret); | |
7497 | btrfs_btree_balance_dirty(root, nr); | |
7498 | } | |
7499 | ||
7500 | free_extent_buffer(reloc_root->node); | |
7501 | ||
7502 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
7503 | &reloc_root->root_key); | |
7504 | BUG_ON(ret); | |
7505 | mutex_unlock(&root->fs_info->drop_mutex); | |
7506 | ||
7507 | nr = trans->blocks_used; | |
7508 | ret = btrfs_end_transaction(trans, root); | |
7509 | BUG_ON(ret); | |
7510 | btrfs_btree_balance_dirty(root, nr); | |
7511 | ||
7512 | kfree(prev_root); | |
7513 | prev_root = reloc_root; | |
7514 | } | |
7515 | if (prev_root) { | |
7516 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
7517 | kfree(prev_root); | |
7518 | } | |
7519 | return 0; | |
7520 | } | |
7521 | ||
7522 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
7523 | { | |
7524 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
7525 | return 0; | |
7526 | } | |
7527 | ||
7528 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
7529 | { | |
7530 | struct btrfs_root *reloc_root; | |
7531 | struct btrfs_trans_handle *trans; | |
7532 | struct btrfs_key location; | |
7533 | int found; | |
7534 | int ret; | |
7535 | ||
7536 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
7537 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
7538 | BUG_ON(ret); | |
7539 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
7540 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
7541 | ||
7542 | if (found) { | |
7543 | trans = btrfs_start_transaction(root, 1); | |
7544 | BUG_ON(!trans); | |
7545 | ret = btrfs_commit_transaction(trans, root); | |
7546 | BUG_ON(ret); | |
7547 | } | |
7548 | ||
7549 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
7550 | location.offset = (u64)-1; | |
7551 | location.type = BTRFS_ROOT_ITEM_KEY; | |
7552 | ||
7553 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
7554 | BUG_ON(!reloc_root); | |
7555 | btrfs_orphan_cleanup(reloc_root); | |
7556 | return 0; | |
7557 | } | |
7558 | ||
d397712b | 7559 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7560 | struct btrfs_root *root) |
7561 | { | |
7562 | struct btrfs_root *reloc_root; | |
7563 | struct extent_buffer *eb; | |
7564 | struct btrfs_root_item *root_item; | |
7565 | struct btrfs_key root_key; | |
7566 | int ret; | |
7567 | ||
7568 | BUG_ON(!root->ref_cows); | |
7569 | if (root->reloc_root) | |
7570 | return 0; | |
7571 | ||
7572 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
7573 | BUG_ON(!root_item); | |
7574 | ||
7575 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
7576 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
7577 | BUG_ON(ret); | |
7578 | ||
7579 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
7580 | root_key.offset = root->root_key.objectid; | |
7581 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
7582 | ||
7583 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
7584 | btrfs_set_root_refs(root_item, 0); | |
7585 | btrfs_set_root_bytenr(root_item, eb->start); | |
7586 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 7587 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
7588 | |
7589 | btrfs_tree_unlock(eb); | |
7590 | free_extent_buffer(eb); | |
7591 | ||
7592 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
7593 | &root_key, root_item); | |
7594 | BUG_ON(ret); | |
7595 | kfree(root_item); | |
7596 | ||
7597 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
7598 | &root_key); | |
7599 | BUG_ON(!reloc_root); | |
7600 | reloc_root->last_trans = trans->transid; | |
7601 | reloc_root->commit_root = NULL; | |
7602 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
7603 | ||
7604 | root->reloc_root = reloc_root; | |
7605 | return 0; | |
7606 | } | |
7607 | ||
7608 | /* | |
7609 | * Core function of space balance. | |
7610 | * | |
7611 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
7612 | * counted roots. There is one reloc tree for each subvol, and all |
7613 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
7614 | * of the latest committed roots of subvols (root->commit_root). | |
7615 | * | |
7616 | * To relocate a tree block referenced by a subvol, there are two steps. | |
7617 | * COW the block through subvol's reloc tree, then update block pointer | |
7618 | * in the subvol to point to the new block. Since all reloc trees share | |
7619 | * same root key objectid, doing special handing for tree blocks owned | |
7620 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
7621 | * we can use the resulting new block directly when the same block is | |
7622 | * required to COW again through other reloc trees. By this way, relocated | |
7623 | * tree blocks are shared between reloc trees, so they are also shared | |
7624 | * between subvols. | |
1a40e23b | 7625 | */ |
d397712b | 7626 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7627 | struct btrfs_root *root, |
7628 | struct btrfs_path *path, | |
7629 | struct btrfs_key *first_key, | |
7630 | struct btrfs_ref_path *ref_path, | |
7631 | struct btrfs_block_group_cache *group, | |
7632 | struct inode *reloc_inode) | |
7633 | { | |
7634 | struct btrfs_root *reloc_root; | |
7635 | struct extent_buffer *eb = NULL; | |
7636 | struct btrfs_key *keys; | |
7637 | u64 *nodes; | |
7638 | int level; | |
f82d02d9 | 7639 | int shared_level; |
1a40e23b | 7640 | int lowest_level = 0; |
1a40e23b ZY |
7641 | int ret; |
7642 | ||
7643 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
7644 | lowest_level = ref_path->owner_objectid; | |
7645 | ||
f82d02d9 | 7646 | if (!root->ref_cows) { |
1a40e23b ZY |
7647 | path->lowest_level = lowest_level; |
7648 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
7649 | BUG_ON(ret < 0); | |
7650 | path->lowest_level = 0; | |
7651 | btrfs_release_path(root, path); | |
7652 | return 0; | |
7653 | } | |
7654 | ||
1a40e23b ZY |
7655 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
7656 | ret = init_reloc_tree(trans, root); | |
7657 | BUG_ON(ret); | |
7658 | reloc_root = root->reloc_root; | |
7659 | ||
f82d02d9 YZ |
7660 | shared_level = ref_path->shared_level; |
7661 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 7662 | |
f82d02d9 YZ |
7663 | keys = ref_path->node_keys; |
7664 | nodes = ref_path->new_nodes; | |
7665 | memset(&keys[shared_level + 1], 0, | |
7666 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
7667 | memset(&nodes[shared_level + 1], 0, | |
7668 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 7669 | |
f82d02d9 YZ |
7670 | if (nodes[lowest_level] == 0) { |
7671 | path->lowest_level = lowest_level; | |
7672 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
7673 | 0, 1); | |
7674 | BUG_ON(ret); | |
7675 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
7676 | eb = path->nodes[level]; | |
7677 | if (!eb || eb == reloc_root->node) | |
7678 | break; | |
7679 | nodes[level] = eb->start; | |
7680 | if (level == 0) | |
7681 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
7682 | else | |
7683 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
7684 | } | |
2b82032c YZ |
7685 | if (nodes[0] && |
7686 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
7687 | eb = path->nodes[0]; |
7688 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
7689 | group, reloc_inode); | |
7690 | BUG_ON(ret); | |
7691 | } | |
7692 | btrfs_release_path(reloc_root, path); | |
7693 | } else { | |
1a40e23b | 7694 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 7695 | lowest_level); |
1a40e23b ZY |
7696 | BUG_ON(ret); |
7697 | } | |
7698 | ||
1a40e23b ZY |
7699 | /* |
7700 | * replace tree blocks in the fs tree with tree blocks in | |
7701 | * the reloc tree. | |
7702 | */ | |
7703 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
7704 | BUG_ON(ret < 0); | |
7705 | ||
7706 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
7707 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
7708 | 0, 0); | |
7709 | BUG_ON(ret); | |
7710 | extent_buffer_get(path->nodes[0]); | |
7711 | eb = path->nodes[0]; | |
7712 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
7713 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
7714 | BUG_ON(ret); | |
7715 | free_extent_buffer(eb); | |
7716 | } | |
1a40e23b | 7717 | |
f82d02d9 | 7718 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 7719 | path->lowest_level = 0; |
1a40e23b ZY |
7720 | return 0; |
7721 | } | |
7722 | ||
d397712b | 7723 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7724 | struct btrfs_root *root, |
7725 | struct btrfs_path *path, | |
7726 | struct btrfs_key *first_key, | |
7727 | struct btrfs_ref_path *ref_path) | |
7728 | { | |
7729 | int ret; | |
1a40e23b ZY |
7730 | |
7731 | ret = relocate_one_path(trans, root, path, first_key, | |
7732 | ref_path, NULL, NULL); | |
7733 | BUG_ON(ret); | |
7734 | ||
1a40e23b ZY |
7735 | return 0; |
7736 | } | |
7737 | ||
d397712b | 7738 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7739 | struct btrfs_root *extent_root, |
7740 | struct btrfs_path *path, | |
7741 | struct btrfs_key *extent_key) | |
7742 | { | |
7743 | int ret; | |
7744 | ||
1a40e23b ZY |
7745 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
7746 | if (ret) | |
7747 | goto out; | |
7748 | ret = btrfs_del_item(trans, extent_root, path); | |
7749 | out: | |
7750 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
7751 | return ret; |
7752 | } | |
7753 | ||
d397712b | 7754 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
7755 | struct btrfs_ref_path *ref_path) |
7756 | { | |
7757 | struct btrfs_key root_key; | |
7758 | ||
7759 | root_key.objectid = ref_path->root_objectid; | |
7760 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
7761 | if (is_cowonly_root(ref_path->root_objectid)) | |
7762 | root_key.offset = 0; | |
7763 | else | |
7764 | root_key.offset = (u64)-1; | |
7765 | ||
7766 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
7767 | } | |
7768 | ||
d397712b | 7769 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
1a40e23b ZY |
7770 | struct btrfs_path *path, |
7771 | struct btrfs_key *extent_key, | |
7772 | struct btrfs_block_group_cache *group, | |
7773 | struct inode *reloc_inode, int pass) | |
7774 | { | |
7775 | struct btrfs_trans_handle *trans; | |
7776 | struct btrfs_root *found_root; | |
7777 | struct btrfs_ref_path *ref_path = NULL; | |
7778 | struct disk_extent *new_extents = NULL; | |
7779 | int nr_extents = 0; | |
7780 | int loops; | |
7781 | int ret; | |
7782 | int level; | |
7783 | struct btrfs_key first_key; | |
7784 | u64 prev_block = 0; | |
7785 | ||
1a40e23b ZY |
7786 | |
7787 | trans = btrfs_start_transaction(extent_root, 1); | |
7788 | BUG_ON(!trans); | |
7789 | ||
7790 | if (extent_key->objectid == 0) { | |
7791 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
7792 | goto out; | |
7793 | } | |
7794 | ||
7795 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
7796 | if (!ref_path) { | |
d397712b CM |
7797 | ret = -ENOMEM; |
7798 | goto out; | |
1a40e23b ZY |
7799 | } |
7800 | ||
7801 | for (loops = 0; ; loops++) { | |
7802 | if (loops == 0) { | |
7803 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
7804 | extent_key->objectid); | |
7805 | } else { | |
7806 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
7807 | } | |
7808 | if (ret < 0) | |
7809 | goto out; | |
7810 | if (ret > 0) | |
7811 | break; | |
7812 | ||
7813 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
7814 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
7815 | continue; | |
7816 | ||
7817 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
7818 | BUG_ON(!found_root); | |
7819 | /* | |
7820 | * for reference counted tree, only process reference paths | |
7821 | * rooted at the latest committed root. | |
7822 | */ | |
7823 | if (found_root->ref_cows && | |
7824 | ref_path->root_generation != found_root->root_key.offset) | |
7825 | continue; | |
7826 | ||
7827 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
7828 | if (pass == 0) { | |
7829 | /* | |
7830 | * copy data extents to new locations | |
7831 | */ | |
7832 | u64 group_start = group->key.objectid; | |
7833 | ret = relocate_data_extent(reloc_inode, | |
7834 | extent_key, | |
7835 | group_start); | |
7836 | if (ret < 0) | |
7837 | goto out; | |
7838 | break; | |
7839 | } | |
7840 | level = 0; | |
7841 | } else { | |
7842 | level = ref_path->owner_objectid; | |
7843 | } | |
7844 | ||
7845 | if (prev_block != ref_path->nodes[level]) { | |
7846 | struct extent_buffer *eb; | |
7847 | u64 block_start = ref_path->nodes[level]; | |
7848 | u64 block_size = btrfs_level_size(found_root, level); | |
7849 | ||
7850 | eb = read_tree_block(found_root, block_start, | |
7851 | block_size, 0); | |
7852 | btrfs_tree_lock(eb); | |
7853 | BUG_ON(level != btrfs_header_level(eb)); | |
7854 | ||
7855 | if (level == 0) | |
7856 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
7857 | else | |
7858 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
7859 | ||
7860 | btrfs_tree_unlock(eb); | |
7861 | free_extent_buffer(eb); | |
7862 | prev_block = block_start; | |
7863 | } | |
7864 | ||
24562425 | 7865 | mutex_lock(&extent_root->fs_info->trans_mutex); |
e4404d6e | 7866 | btrfs_record_root_in_trans(found_root); |
24562425 | 7867 | mutex_unlock(&extent_root->fs_info->trans_mutex); |
e4404d6e YZ |
7868 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
7869 | /* | |
7870 | * try to update data extent references while | |
7871 | * keeping metadata shared between snapshots. | |
7872 | */ | |
7873 | if (pass == 1) { | |
7874 | ret = relocate_one_path(trans, found_root, | |
7875 | path, &first_key, ref_path, | |
7876 | group, reloc_inode); | |
7877 | if (ret < 0) | |
7878 | goto out; | |
7879 | continue; | |
7880 | } | |
1a40e23b ZY |
7881 | /* |
7882 | * use fallback method to process the remaining | |
7883 | * references. | |
7884 | */ | |
7885 | if (!new_extents) { | |
7886 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
7887 | new_extents = kmalloc(sizeof(*new_extents), |
7888 | GFP_NOFS); | |
7889 | nr_extents = 1; | |
1a40e23b ZY |
7890 | ret = get_new_locations(reloc_inode, |
7891 | extent_key, | |
d899e052 | 7892 | group_start, 1, |
1a40e23b ZY |
7893 | &new_extents, |
7894 | &nr_extents); | |
d899e052 | 7895 | if (ret) |
1a40e23b ZY |
7896 | goto out; |
7897 | } | |
1a40e23b ZY |
7898 | ret = replace_one_extent(trans, found_root, |
7899 | path, extent_key, | |
7900 | &first_key, ref_path, | |
7901 | new_extents, nr_extents); | |
e4404d6e | 7902 | } else { |
1a40e23b ZY |
7903 | ret = relocate_tree_block(trans, found_root, path, |
7904 | &first_key, ref_path); | |
1a40e23b ZY |
7905 | } |
7906 | if (ret < 0) | |
7907 | goto out; | |
7908 | } | |
7909 | ret = 0; | |
7910 | out: | |
7911 | btrfs_end_transaction(trans, extent_root); | |
7912 | kfree(new_extents); | |
7913 | kfree(ref_path); | |
1a40e23b ZY |
7914 | return ret; |
7915 | } | |
5d4f98a2 | 7916 | #endif |
1a40e23b | 7917 | |
ec44a35c CM |
7918 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7919 | { | |
7920 | u64 num_devices; | |
7921 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
7922 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
7923 | ||
cd02dca5 CM |
7924 | /* |
7925 | * we add in the count of missing devices because we want | |
7926 | * to make sure that any RAID levels on a degraded FS | |
7927 | * continue to be honored. | |
7928 | */ | |
7929 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7930 | root->fs_info->fs_devices->missing_devices; | |
7931 | ||
ec44a35c CM |
7932 | if (num_devices == 1) { |
7933 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7934 | stripped = flags & ~stripped; | |
7935 | ||
7936 | /* turn raid0 into single device chunks */ | |
7937 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7938 | return stripped; | |
7939 | ||
7940 | /* turn mirroring into duplication */ | |
7941 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7942 | BTRFS_BLOCK_GROUP_RAID10)) | |
7943 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
7944 | return flags; | |
7945 | } else { | |
7946 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7947 | if (flags & stripped) |
7948 | return flags; | |
7949 | ||
7950 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7951 | stripped = flags & ~stripped; | |
7952 | ||
7953 | /* switch duplicated blocks with raid1 */ | |
7954 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7955 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7956 | ||
7957 | /* turn single device chunks into raid0 */ | |
7958 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
7959 | } | |
7960 | return flags; | |
7961 | } | |
7962 | ||
f0486c68 | 7963 | static int set_block_group_ro(struct btrfs_block_group_cache *cache) |
0ef3e66b | 7964 | { |
f0486c68 YZ |
7965 | struct btrfs_space_info *sinfo = cache->space_info; |
7966 | u64 num_bytes; | |
7967 | int ret = -ENOSPC; | |
0ef3e66b | 7968 | |
f0486c68 YZ |
7969 | if (cache->ro) |
7970 | return 0; | |
c286ac48 | 7971 | |
f0486c68 YZ |
7972 | spin_lock(&sinfo->lock); |
7973 | spin_lock(&cache->lock); | |
7974 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7975 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7976 | ||
7977 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
7978 | sinfo->bytes_may_use + sinfo->bytes_readonly + | |
65e5341b | 7979 | cache->reserved_pinned + num_bytes <= sinfo->total_bytes) { |
f0486c68 YZ |
7980 | sinfo->bytes_readonly += num_bytes; |
7981 | sinfo->bytes_reserved += cache->reserved_pinned; | |
7982 | cache->reserved_pinned = 0; | |
7983 | cache->ro = 1; | |
7984 | ret = 0; | |
7985 | } | |
65e5341b | 7986 | |
f0486c68 YZ |
7987 | spin_unlock(&cache->lock); |
7988 | spin_unlock(&sinfo->lock); | |
7989 | return ret; | |
7990 | } | |
7d9eb12c | 7991 | |
f0486c68 YZ |
7992 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7993 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7994 | |
f0486c68 YZ |
7995 | { |
7996 | struct btrfs_trans_handle *trans; | |
7997 | u64 alloc_flags; | |
7998 | int ret; | |
7d9eb12c | 7999 | |
f0486c68 | 8000 | BUG_ON(cache->ro); |
0ef3e66b | 8001 | |
f0486c68 YZ |
8002 | trans = btrfs_join_transaction(root, 1); |
8003 | BUG_ON(IS_ERR(trans)); | |
5d4f98a2 | 8004 | |
f0486c68 YZ |
8005 | alloc_flags = update_block_group_flags(root, cache->flags); |
8006 | if (alloc_flags != cache->flags) | |
8007 | do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); | |
5d4f98a2 | 8008 | |
f0486c68 YZ |
8009 | ret = set_block_group_ro(cache); |
8010 | if (!ret) | |
8011 | goto out; | |
8012 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
8013 | ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); | |
8014 | if (ret < 0) | |
8015 | goto out; | |
8016 | ret = set_block_group_ro(cache); | |
8017 | out: | |
8018 | btrfs_end_transaction(trans, root); | |
8019 | return ret; | |
8020 | } | |
5d4f98a2 | 8021 | |
f0486c68 YZ |
8022 | int btrfs_set_block_group_rw(struct btrfs_root *root, |
8023 | struct btrfs_block_group_cache *cache) | |
5d4f98a2 | 8024 | { |
f0486c68 YZ |
8025 | struct btrfs_space_info *sinfo = cache->space_info; |
8026 | u64 num_bytes; | |
8027 | ||
8028 | BUG_ON(!cache->ro); | |
8029 | ||
8030 | spin_lock(&sinfo->lock); | |
8031 | spin_lock(&cache->lock); | |
8032 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
8033 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
8034 | sinfo->bytes_readonly -= num_bytes; | |
8035 | cache->ro = 0; | |
8036 | spin_unlock(&cache->lock); | |
8037 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
8038 | return 0; |
8039 | } | |
8040 | ||
ba1bf481 JB |
8041 | /* |
8042 | * checks to see if its even possible to relocate this block group. | |
8043 | * | |
8044 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
8045 | * ok to go ahead and try. | |
8046 | */ | |
8047 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 8048 | { |
ba1bf481 JB |
8049 | struct btrfs_block_group_cache *block_group; |
8050 | struct btrfs_space_info *space_info; | |
8051 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
8052 | struct btrfs_device *device; | |
8053 | int full = 0; | |
8054 | int ret = 0; | |
1a40e23b | 8055 | |
ba1bf481 | 8056 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 8057 | |
ba1bf481 JB |
8058 | /* odd, couldn't find the block group, leave it alone */ |
8059 | if (!block_group) | |
8060 | return -1; | |
1a40e23b | 8061 | |
ba1bf481 JB |
8062 | /* no bytes used, we're good */ |
8063 | if (!btrfs_block_group_used(&block_group->item)) | |
1a40e23b ZY |
8064 | goto out; |
8065 | ||
ba1bf481 JB |
8066 | space_info = block_group->space_info; |
8067 | spin_lock(&space_info->lock); | |
17d217fe | 8068 | |
ba1bf481 | 8069 | full = space_info->full; |
17d217fe | 8070 | |
ba1bf481 JB |
8071 | /* |
8072 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
8073 | * relocate it unless we're able to allocate a new chunk below. |
8074 | * | |
8075 | * Otherwise, we need to make sure we have room in the space to handle | |
8076 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 8077 | */ |
7ce618db CM |
8078 | if ((space_info->total_bytes != block_group->key.offset) && |
8079 | (space_info->bytes_used + space_info->bytes_reserved + | |
ba1bf481 JB |
8080 | space_info->bytes_pinned + space_info->bytes_readonly + |
8081 | btrfs_block_group_used(&block_group->item) < | |
7ce618db | 8082 | space_info->total_bytes)) { |
ba1bf481 JB |
8083 | spin_unlock(&space_info->lock); |
8084 | goto out; | |
17d217fe | 8085 | } |
ba1bf481 | 8086 | spin_unlock(&space_info->lock); |
ea8c2819 | 8087 | |
ba1bf481 JB |
8088 | /* |
8089 | * ok we don't have enough space, but maybe we have free space on our | |
8090 | * devices to allocate new chunks for relocation, so loop through our | |
8091 | * alloc devices and guess if we have enough space. However, if we | |
8092 | * were marked as full, then we know there aren't enough chunks, and we | |
8093 | * can just return. | |
8094 | */ | |
8095 | ret = -1; | |
8096 | if (full) | |
8097 | goto out; | |
ea8c2819 | 8098 | |
ba1bf481 JB |
8099 | mutex_lock(&root->fs_info->chunk_mutex); |
8100 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
8101 | u64 min_free = btrfs_block_group_used(&block_group->item); | |
8102 | u64 dev_offset, max_avail; | |
56bec294 | 8103 | |
ba1bf481 JB |
8104 | /* |
8105 | * check to make sure we can actually find a chunk with enough | |
8106 | * space to fit our block group in. | |
8107 | */ | |
8108 | if (device->total_bytes > device->bytes_used + min_free) { | |
8109 | ret = find_free_dev_extent(NULL, device, min_free, | |
8110 | &dev_offset, &max_avail); | |
8111 | if (!ret) | |
73e48b27 | 8112 | break; |
ba1bf481 | 8113 | ret = -1; |
725c8463 | 8114 | } |
edbd8d4e | 8115 | } |
ba1bf481 | 8116 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 8117 | out: |
ba1bf481 | 8118 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
8119 | return ret; |
8120 | } | |
8121 | ||
b2950863 CH |
8122 | static int find_first_block_group(struct btrfs_root *root, |
8123 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 8124 | { |
925baedd | 8125 | int ret = 0; |
0b86a832 CM |
8126 | struct btrfs_key found_key; |
8127 | struct extent_buffer *leaf; | |
8128 | int slot; | |
edbd8d4e | 8129 | |
0b86a832 CM |
8130 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
8131 | if (ret < 0) | |
925baedd CM |
8132 | goto out; |
8133 | ||
d397712b | 8134 | while (1) { |
0b86a832 | 8135 | slot = path->slots[0]; |
edbd8d4e | 8136 | leaf = path->nodes[0]; |
0b86a832 CM |
8137 | if (slot >= btrfs_header_nritems(leaf)) { |
8138 | ret = btrfs_next_leaf(root, path); | |
8139 | if (ret == 0) | |
8140 | continue; | |
8141 | if (ret < 0) | |
925baedd | 8142 | goto out; |
0b86a832 | 8143 | break; |
edbd8d4e | 8144 | } |
0b86a832 | 8145 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 8146 | |
0b86a832 | 8147 | if (found_key.objectid >= key->objectid && |
925baedd CM |
8148 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
8149 | ret = 0; | |
8150 | goto out; | |
8151 | } | |
0b86a832 | 8152 | path->slots[0]++; |
edbd8d4e | 8153 | } |
925baedd | 8154 | out: |
0b86a832 | 8155 | return ret; |
edbd8d4e CM |
8156 | } |
8157 | ||
0af3d00b JB |
8158 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
8159 | { | |
8160 | struct btrfs_block_group_cache *block_group; | |
8161 | u64 last = 0; | |
8162 | ||
8163 | while (1) { | |
8164 | struct inode *inode; | |
8165 | ||
8166 | block_group = btrfs_lookup_first_block_group(info, last); | |
8167 | while (block_group) { | |
8168 | spin_lock(&block_group->lock); | |
8169 | if (block_group->iref) | |
8170 | break; | |
8171 | spin_unlock(&block_group->lock); | |
8172 | block_group = next_block_group(info->tree_root, | |
8173 | block_group); | |
8174 | } | |
8175 | if (!block_group) { | |
8176 | if (last == 0) | |
8177 | break; | |
8178 | last = 0; | |
8179 | continue; | |
8180 | } | |
8181 | ||
8182 | inode = block_group->inode; | |
8183 | block_group->iref = 0; | |
8184 | block_group->inode = NULL; | |
8185 | spin_unlock(&block_group->lock); | |
8186 | iput(inode); | |
8187 | last = block_group->key.objectid + block_group->key.offset; | |
8188 | btrfs_put_block_group(block_group); | |
8189 | } | |
8190 | } | |
8191 | ||
1a40e23b ZY |
8192 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
8193 | { | |
8194 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 8195 | struct btrfs_space_info *space_info; |
11833d66 | 8196 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
8197 | struct rb_node *n; |
8198 | ||
11833d66 YZ |
8199 | down_write(&info->extent_commit_sem); |
8200 | while (!list_empty(&info->caching_block_groups)) { | |
8201 | caching_ctl = list_entry(info->caching_block_groups.next, | |
8202 | struct btrfs_caching_control, list); | |
8203 | list_del(&caching_ctl->list); | |
8204 | put_caching_control(caching_ctl); | |
8205 | } | |
8206 | up_write(&info->extent_commit_sem); | |
8207 | ||
1a40e23b ZY |
8208 | spin_lock(&info->block_group_cache_lock); |
8209 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
8210 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
8211 | cache_node); | |
1a40e23b ZY |
8212 | rb_erase(&block_group->cache_node, |
8213 | &info->block_group_cache_tree); | |
d899e052 YZ |
8214 | spin_unlock(&info->block_group_cache_lock); |
8215 | ||
80eb234a | 8216 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 8217 | list_del(&block_group->list); |
80eb234a | 8218 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 8219 | |
817d52f8 | 8220 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8221 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8222 | |
8223 | btrfs_remove_free_space_cache(block_group); | |
11dfe35a | 8224 | btrfs_put_block_group(block_group); |
d899e052 YZ |
8225 | |
8226 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
8227 | } |
8228 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
8229 | |
8230 | /* now that all the block groups are freed, go through and | |
8231 | * free all the space_info structs. This is only called during | |
8232 | * the final stages of unmount, and so we know nobody is | |
8233 | * using them. We call synchronize_rcu() once before we start, | |
8234 | * just to be on the safe side. | |
8235 | */ | |
8236 | synchronize_rcu(); | |
8237 | ||
8929ecfa YZ |
8238 | release_global_block_rsv(info); |
8239 | ||
4184ea7f CM |
8240 | while(!list_empty(&info->space_info)) { |
8241 | space_info = list_entry(info->space_info.next, | |
8242 | struct btrfs_space_info, | |
8243 | list); | |
f0486c68 YZ |
8244 | if (space_info->bytes_pinned > 0 || |
8245 | space_info->bytes_reserved > 0) { | |
8246 | WARN_ON(1); | |
8247 | dump_space_info(space_info, 0, 0); | |
8248 | } | |
4184ea7f CM |
8249 | list_del(&space_info->list); |
8250 | kfree(space_info); | |
8251 | } | |
1a40e23b ZY |
8252 | return 0; |
8253 | } | |
8254 | ||
b742bb82 YZ |
8255 | static void __link_block_group(struct btrfs_space_info *space_info, |
8256 | struct btrfs_block_group_cache *cache) | |
8257 | { | |
8258 | int index = get_block_group_index(cache); | |
8259 | ||
8260 | down_write(&space_info->groups_sem); | |
8261 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
8262 | up_write(&space_info->groups_sem); | |
8263 | } | |
8264 | ||
9078a3e1 CM |
8265 | int btrfs_read_block_groups(struct btrfs_root *root) |
8266 | { | |
8267 | struct btrfs_path *path; | |
8268 | int ret; | |
9078a3e1 | 8269 | struct btrfs_block_group_cache *cache; |
be744175 | 8270 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 8271 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
8272 | struct btrfs_key key; |
8273 | struct btrfs_key found_key; | |
5f39d397 | 8274 | struct extent_buffer *leaf; |
0af3d00b JB |
8275 | int need_clear = 0; |
8276 | u64 cache_gen; | |
96b5179d | 8277 | |
be744175 | 8278 | root = info->extent_root; |
9078a3e1 | 8279 | key.objectid = 0; |
0b86a832 | 8280 | key.offset = 0; |
9078a3e1 | 8281 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
8282 | path = btrfs_alloc_path(); |
8283 | if (!path) | |
8284 | return -ENOMEM; | |
8285 | ||
0af3d00b JB |
8286 | cache_gen = btrfs_super_cache_generation(&root->fs_info->super_copy); |
8287 | if (cache_gen != 0 && | |
8288 | btrfs_super_generation(&root->fs_info->super_copy) != cache_gen) | |
8289 | need_clear = 1; | |
88c2ba3b JB |
8290 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
8291 | need_clear = 1; | |
8216ef86 JB |
8292 | if (!btrfs_test_opt(root, SPACE_CACHE) && cache_gen) |
8293 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); | |
0af3d00b | 8294 | |
d397712b | 8295 | while (1) { |
0b86a832 | 8296 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
8297 | if (ret > 0) |
8298 | break; | |
0b86a832 CM |
8299 | if (ret != 0) |
8300 | goto error; | |
5f39d397 CM |
8301 | leaf = path->nodes[0]; |
8302 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 8303 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 8304 | if (!cache) { |
0b86a832 | 8305 | ret = -ENOMEM; |
f0486c68 | 8306 | goto error; |
9078a3e1 | 8307 | } |
3e1ad54f | 8308 | |
d2fb3437 | 8309 | atomic_set(&cache->count, 1); |
c286ac48 | 8310 | spin_lock_init(&cache->lock); |
6226cb0a | 8311 | spin_lock_init(&cache->tree_lock); |
817d52f8 | 8312 | cache->fs_info = info; |
0f9dd46c | 8313 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8314 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 8315 | |
0af3d00b JB |
8316 | if (need_clear) |
8317 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
8318 | ||
96303081 JB |
8319 | /* |
8320 | * we only want to have 32k of ram per block group for keeping | |
8321 | * track of free space, and if we pass 1/2 of that we want to | |
8322 | * start converting things over to using bitmaps | |
8323 | */ | |
8324 | cache->extents_thresh = ((1024 * 32) / 2) / | |
8325 | sizeof(struct btrfs_free_space); | |
8326 | ||
5f39d397 CM |
8327 | read_extent_buffer(leaf, &cache->item, |
8328 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
8329 | sizeof(cache->item)); | |
9078a3e1 | 8330 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 8331 | |
9078a3e1 CM |
8332 | key.objectid = found_key.objectid + found_key.offset; |
8333 | btrfs_release_path(root, path); | |
0b86a832 | 8334 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
8335 | cache->sectorsize = root->sectorsize; |
8336 | ||
817d52f8 JB |
8337 | /* |
8338 | * check for two cases, either we are full, and therefore | |
8339 | * don't need to bother with the caching work since we won't | |
8340 | * find any space, or we are empty, and we can just add all | |
8341 | * the space in and be done with it. This saves us _alot_ of | |
8342 | * time, particularly in the full case. | |
8343 | */ | |
8344 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
1b2da372 | 8345 | exclude_super_stripes(root, cache); |
11833d66 | 8346 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8347 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8348 | free_excluded_extents(root, cache); |
817d52f8 | 8349 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 YZ |
8350 | exclude_super_stripes(root, cache); |
8351 | cache->last_byte_to_unpin = (u64)-1; | |
817d52f8 JB |
8352 | cache->cached = BTRFS_CACHE_FINISHED; |
8353 | add_new_free_space(cache, root->fs_info, | |
8354 | found_key.objectid, | |
8355 | found_key.objectid + | |
8356 | found_key.offset); | |
11833d66 | 8357 | free_excluded_extents(root, cache); |
817d52f8 | 8358 | } |
96b5179d | 8359 | |
6324fbf3 CM |
8360 | ret = update_space_info(info, cache->flags, found_key.offset, |
8361 | btrfs_block_group_used(&cache->item), | |
8362 | &space_info); | |
8363 | BUG_ON(ret); | |
8364 | cache->space_info = space_info; | |
1b2da372 | 8365 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8366 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8367 | spin_unlock(&cache->space_info->lock); |
8368 | ||
b742bb82 | 8369 | __link_block_group(space_info, cache); |
0f9dd46c JB |
8370 | |
8371 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
8372 | BUG_ON(ret); | |
75ccf47d CM |
8373 | |
8374 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 8375 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
f0486c68 | 8376 | set_block_group_ro(cache); |
9078a3e1 | 8377 | } |
b742bb82 YZ |
8378 | |
8379 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8380 | if (!(get_alloc_profile(root, space_info->flags) & | |
8381 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8382 | BTRFS_BLOCK_GROUP_RAID1 | | |
8383 | BTRFS_BLOCK_GROUP_DUP))) | |
8384 | continue; | |
8385 | /* | |
8386 | * avoid allocating from un-mirrored block group if there are | |
8387 | * mirrored block groups. | |
8388 | */ | |
8389 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
f0486c68 | 8390 | set_block_group_ro(cache); |
b742bb82 | 8391 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
f0486c68 | 8392 | set_block_group_ro(cache); |
9078a3e1 | 8393 | } |
f0486c68 YZ |
8394 | |
8395 | init_global_block_rsv(info); | |
0b86a832 CM |
8396 | ret = 0; |
8397 | error: | |
9078a3e1 | 8398 | btrfs_free_path(path); |
0b86a832 | 8399 | return ret; |
9078a3e1 | 8400 | } |
6324fbf3 CM |
8401 | |
8402 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
8403 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8404 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8405 | u64 size) |
8406 | { | |
8407 | int ret; | |
6324fbf3 CM |
8408 | struct btrfs_root *extent_root; |
8409 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8410 | |
8411 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8412 | |
12fcfd22 | 8413 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8414 | |
8f18cf13 | 8415 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8416 | if (!cache) |
8417 | return -ENOMEM; | |
8418 | ||
e17cade2 | 8419 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8420 | cache->key.offset = size; |
d2fb3437 | 8421 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 8422 | cache->sectorsize = root->sectorsize; |
0af3d00b | 8423 | cache->fs_info = root->fs_info; |
96303081 JB |
8424 | |
8425 | /* | |
8426 | * we only want to have 32k of ram per block group for keeping track | |
8427 | * of free space, and if we pass 1/2 of that we want to start | |
8428 | * converting things over to using bitmaps | |
8429 | */ | |
8430 | cache->extents_thresh = ((1024 * 32) / 2) / | |
8431 | sizeof(struct btrfs_free_space); | |
d2fb3437 | 8432 | atomic_set(&cache->count, 1); |
c286ac48 | 8433 | spin_lock_init(&cache->lock); |
6226cb0a | 8434 | spin_lock_init(&cache->tree_lock); |
0f9dd46c | 8435 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8436 | INIT_LIST_HEAD(&cache->cluster_list); |
0ef3e66b | 8437 | |
6324fbf3 | 8438 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8439 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8440 | cache->flags = type; | |
8441 | btrfs_set_block_group_flags(&cache->item, type); | |
8442 | ||
11833d66 | 8443 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8444 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 8445 | exclude_super_stripes(root, cache); |
96303081 | 8446 | |
817d52f8 JB |
8447 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8448 | chunk_offset + size); | |
8449 | ||
11833d66 YZ |
8450 | free_excluded_extents(root, cache); |
8451 | ||
6324fbf3 CM |
8452 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8453 | &cache->space_info); | |
8454 | BUG_ON(ret); | |
1b2da372 JB |
8455 | |
8456 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8457 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8458 | spin_unlock(&cache->space_info->lock); |
8459 | ||
b742bb82 | 8460 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8461 | |
0f9dd46c JB |
8462 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8463 | BUG_ON(ret); | |
c286ac48 | 8464 | |
6324fbf3 CM |
8465 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
8466 | sizeof(cache->item)); | |
8467 | BUG_ON(ret); | |
8468 | ||
d18a2c44 | 8469 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8470 | |
6324fbf3 CM |
8471 | return 0; |
8472 | } | |
1a40e23b ZY |
8473 | |
8474 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
8475 | struct btrfs_root *root, u64 group_start) | |
8476 | { | |
8477 | struct btrfs_path *path; | |
8478 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8479 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8480 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8481 | struct btrfs_key key; |
0af3d00b | 8482 | struct inode *inode; |
1a40e23b | 8483 | int ret; |
89a55897 | 8484 | int factor; |
1a40e23b | 8485 | |
1a40e23b ZY |
8486 | root = root->fs_info->extent_root; |
8487 | ||
8488 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8489 | BUG_ON(!block_group); | |
c146afad | 8490 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
8491 | |
8492 | memcpy(&key, &block_group->key, sizeof(key)); | |
89a55897 JB |
8493 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8494 | BTRFS_BLOCK_GROUP_RAID1 | | |
8495 | BTRFS_BLOCK_GROUP_RAID10)) | |
8496 | factor = 2; | |
8497 | else | |
8498 | factor = 1; | |
1a40e23b | 8499 | |
44fb5511 CM |
8500 | /* make sure this block group isn't part of an allocation cluster */ |
8501 | cluster = &root->fs_info->data_alloc_cluster; | |
8502 | spin_lock(&cluster->refill_lock); | |
8503 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8504 | spin_unlock(&cluster->refill_lock); | |
8505 | ||
8506 | /* | |
8507 | * make sure this block group isn't part of a metadata | |
8508 | * allocation cluster | |
8509 | */ | |
8510 | cluster = &root->fs_info->meta_alloc_cluster; | |
8511 | spin_lock(&cluster->refill_lock); | |
8512 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8513 | spin_unlock(&cluster->refill_lock); | |
8514 | ||
1a40e23b ZY |
8515 | path = btrfs_alloc_path(); |
8516 | BUG_ON(!path); | |
8517 | ||
0af3d00b JB |
8518 | inode = lookup_free_space_inode(root, block_group, path); |
8519 | if (!IS_ERR(inode)) { | |
8520 | btrfs_orphan_add(trans, inode); | |
8521 | clear_nlink(inode); | |
8522 | /* One for the block groups ref */ | |
8523 | spin_lock(&block_group->lock); | |
8524 | if (block_group->iref) { | |
8525 | block_group->iref = 0; | |
8526 | block_group->inode = NULL; | |
8527 | spin_unlock(&block_group->lock); | |
8528 | iput(inode); | |
8529 | } else { | |
8530 | spin_unlock(&block_group->lock); | |
8531 | } | |
8532 | /* One for our lookup ref */ | |
8533 | iput(inode); | |
8534 | } | |
8535 | ||
8536 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8537 | key.offset = block_group->key.objectid; | |
8538 | key.type = 0; | |
8539 | ||
8540 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8541 | if (ret < 0) | |
8542 | goto out; | |
8543 | if (ret > 0) | |
8544 | btrfs_release_path(tree_root, path); | |
8545 | if (ret == 0) { | |
8546 | ret = btrfs_del_item(trans, tree_root, path); | |
8547 | if (ret) | |
8548 | goto out; | |
8549 | btrfs_release_path(tree_root, path); | |
8550 | } | |
8551 | ||
3dfdb934 | 8552 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8553 | rb_erase(&block_group->cache_node, |
8554 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 | 8555 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8556 | |
80eb234a | 8557 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8558 | /* |
8559 | * we must use list_del_init so people can check to see if they | |
8560 | * are still on the list after taking the semaphore | |
8561 | */ | |
8562 | list_del_init(&block_group->list); | |
80eb234a | 8563 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8564 | |
817d52f8 | 8565 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8566 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8567 | |
8568 | btrfs_remove_free_space_cache(block_group); | |
8569 | ||
c146afad YZ |
8570 | spin_lock(&block_group->space_info->lock); |
8571 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8572 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8573 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8574 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8575 | |
0af3d00b JB |
8576 | memcpy(&key, &block_group->key, sizeof(key)); |
8577 | ||
283bb197 | 8578 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8579 | |
fa9c0d79 CM |
8580 | btrfs_put_block_group(block_group); |
8581 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8582 | |
8583 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8584 | if (ret > 0) | |
8585 | ret = -EIO; | |
8586 | if (ret < 0) | |
8587 | goto out; | |
8588 | ||
8589 | ret = btrfs_del_item(trans, root, path); | |
8590 | out: | |
8591 | btrfs_free_path(path); | |
8592 | return ret; | |
8593 | } |