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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
4b4e25f2 | 25 | #include "compat.h" |
74493f7a | 26 | #include "hash.h" |
fec577fb CM |
27 | #include "ctree.h" |
28 | #include "disk-io.h" | |
29 | #include "print-tree.h" | |
e089f05c | 30 | #include "transaction.h" |
0b86a832 | 31 | #include "volumes.h" |
925baedd | 32 | #include "locking.h" |
fa9c0d79 | 33 | #include "free-space-cache.h" |
fec577fb | 34 | |
f3465ca4 JB |
35 | static int update_block_group(struct btrfs_trans_handle *trans, |
36 | struct btrfs_root *root, | |
37 | u64 bytenr, u64 num_bytes, int alloc, | |
38 | int mark_free); | |
11833d66 YZ |
39 | static int update_reserved_extents(struct btrfs_block_group_cache *cache, |
40 | u64 num_bytes, int reserve); | |
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 pin_down_bytes(struct btrfs_trans_handle *trans, |
64 | struct btrfs_root *root, | |
65 | struct btrfs_path *path, | |
66 | u64 bytenr, u64 num_bytes, | |
67 | int is_data, int reserved, | |
68 | struct extent_buffer **must_clean); | |
69 | static int find_next_key(struct btrfs_path *path, int level, | |
70 | struct btrfs_key *key); | |
9ed74f2d JB |
71 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
72 | int dump_block_groups); | |
6a63209f | 73 | |
817d52f8 JB |
74 | static noinline int |
75 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
76 | { | |
77 | smp_mb(); | |
78 | return cache->cached == BTRFS_CACHE_FINISHED; | |
79 | } | |
80 | ||
0f9dd46c JB |
81 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
82 | { | |
83 | return (cache->flags & bits) == bits; | |
84 | } | |
85 | ||
86 | /* | |
87 | * this adds the block group to the fs_info rb tree for the block group | |
88 | * cache | |
89 | */ | |
b2950863 | 90 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
91 | struct btrfs_block_group_cache *block_group) |
92 | { | |
93 | struct rb_node **p; | |
94 | struct rb_node *parent = NULL; | |
95 | struct btrfs_block_group_cache *cache; | |
96 | ||
97 | spin_lock(&info->block_group_cache_lock); | |
98 | p = &info->block_group_cache_tree.rb_node; | |
99 | ||
100 | while (*p) { | |
101 | parent = *p; | |
102 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
103 | cache_node); | |
104 | if (block_group->key.objectid < cache->key.objectid) { | |
105 | p = &(*p)->rb_left; | |
106 | } else if (block_group->key.objectid > cache->key.objectid) { | |
107 | p = &(*p)->rb_right; | |
108 | } else { | |
109 | spin_unlock(&info->block_group_cache_lock); | |
110 | return -EEXIST; | |
111 | } | |
112 | } | |
113 | ||
114 | rb_link_node(&block_group->cache_node, parent, p); | |
115 | rb_insert_color(&block_group->cache_node, | |
116 | &info->block_group_cache_tree); | |
117 | spin_unlock(&info->block_group_cache_lock); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | /* | |
123 | * This will return the block group at or after bytenr if contains is 0, else | |
124 | * it will return the block group that contains the bytenr | |
125 | */ | |
126 | static struct btrfs_block_group_cache * | |
127 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
128 | int contains) | |
129 | { | |
130 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
131 | struct rb_node *n; | |
132 | u64 end, start; | |
133 | ||
134 | spin_lock(&info->block_group_cache_lock); | |
135 | n = info->block_group_cache_tree.rb_node; | |
136 | ||
137 | while (n) { | |
138 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
139 | cache_node); | |
140 | end = cache->key.objectid + cache->key.offset - 1; | |
141 | start = cache->key.objectid; | |
142 | ||
143 | if (bytenr < start) { | |
144 | if (!contains && (!ret || start < ret->key.objectid)) | |
145 | ret = cache; | |
146 | n = n->rb_left; | |
147 | } else if (bytenr > start) { | |
148 | if (contains && bytenr <= end) { | |
149 | ret = cache; | |
150 | break; | |
151 | } | |
152 | n = n->rb_right; | |
153 | } else { | |
154 | ret = cache; | |
155 | break; | |
156 | } | |
157 | } | |
d2fb3437 YZ |
158 | if (ret) |
159 | atomic_inc(&ret->count); | |
0f9dd46c JB |
160 | spin_unlock(&info->block_group_cache_lock); |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
11833d66 YZ |
165 | static int add_excluded_extent(struct btrfs_root *root, |
166 | u64 start, u64 num_bytes) | |
817d52f8 | 167 | { |
11833d66 YZ |
168 | u64 end = start + num_bytes - 1; |
169 | set_extent_bits(&root->fs_info->freed_extents[0], | |
170 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
171 | set_extent_bits(&root->fs_info->freed_extents[1], | |
172 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
173 | return 0; | |
174 | } | |
817d52f8 | 175 | |
11833d66 YZ |
176 | static void free_excluded_extents(struct btrfs_root *root, |
177 | struct btrfs_block_group_cache *cache) | |
178 | { | |
179 | u64 start, end; | |
817d52f8 | 180 | |
11833d66 YZ |
181 | start = cache->key.objectid; |
182 | end = start + cache->key.offset - 1; | |
183 | ||
184 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
185 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
186 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
187 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
188 | } |
189 | ||
11833d66 YZ |
190 | static int exclude_super_stripes(struct btrfs_root *root, |
191 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 192 | { |
817d52f8 JB |
193 | u64 bytenr; |
194 | u64 *logical; | |
195 | int stripe_len; | |
196 | int i, nr, ret; | |
197 | ||
198 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
199 | bytenr = btrfs_sb_offset(i); | |
200 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
201 | cache->key.objectid, bytenr, | |
202 | 0, &logical, &nr, &stripe_len); | |
203 | BUG_ON(ret); | |
11833d66 | 204 | |
817d52f8 | 205 | while (nr--) { |
1b2da372 | 206 | cache->bytes_super += stripe_len; |
11833d66 YZ |
207 | ret = add_excluded_extent(root, logical[nr], |
208 | stripe_len); | |
209 | BUG_ON(ret); | |
817d52f8 | 210 | } |
11833d66 | 211 | |
817d52f8 JB |
212 | kfree(logical); |
213 | } | |
817d52f8 JB |
214 | return 0; |
215 | } | |
216 | ||
11833d66 YZ |
217 | static struct btrfs_caching_control * |
218 | get_caching_control(struct btrfs_block_group_cache *cache) | |
219 | { | |
220 | struct btrfs_caching_control *ctl; | |
221 | ||
222 | spin_lock(&cache->lock); | |
223 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
224 | spin_unlock(&cache->lock); | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | ctl = cache->caching_ctl; | |
229 | atomic_inc(&ctl->count); | |
230 | spin_unlock(&cache->lock); | |
231 | return ctl; | |
232 | } | |
233 | ||
234 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
235 | { | |
236 | if (atomic_dec_and_test(&ctl->count)) | |
237 | kfree(ctl); | |
238 | } | |
239 | ||
0f9dd46c JB |
240 | /* |
241 | * this is only called by cache_block_group, since we could have freed extents | |
242 | * we need to check the pinned_extents for any extents that can't be used yet | |
243 | * since their free space will be released as soon as the transaction commits. | |
244 | */ | |
817d52f8 | 245 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
246 | struct btrfs_fs_info *info, u64 start, u64 end) |
247 | { | |
817d52f8 | 248 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
249 | int ret; |
250 | ||
251 | while (start < end) { | |
11833d66 | 252 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 253 | &extent_start, &extent_end, |
11833d66 | 254 | EXTENT_DIRTY | EXTENT_UPTODATE); |
0f9dd46c JB |
255 | if (ret) |
256 | break; | |
257 | ||
258 | if (extent_start == start) { | |
259 | start = extent_end + 1; | |
260 | } else if (extent_start > start && extent_start < end) { | |
261 | size = extent_start - start; | |
817d52f8 | 262 | total_added += size; |
ea6a478e JB |
263 | ret = btrfs_add_free_space(block_group, start, |
264 | size); | |
0f9dd46c JB |
265 | BUG_ON(ret); |
266 | start = extent_end + 1; | |
267 | } else { | |
268 | break; | |
269 | } | |
270 | } | |
271 | ||
272 | if (start < end) { | |
273 | size = end - start; | |
817d52f8 | 274 | total_added += size; |
ea6a478e | 275 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
276 | BUG_ON(ret); |
277 | } | |
278 | ||
817d52f8 | 279 | return total_added; |
0f9dd46c JB |
280 | } |
281 | ||
817d52f8 | 282 | static int caching_kthread(void *data) |
e37c9e69 | 283 | { |
817d52f8 JB |
284 | struct btrfs_block_group_cache *block_group = data; |
285 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
11833d66 YZ |
286 | struct btrfs_caching_control *caching_ctl = block_group->caching_ctl; |
287 | struct btrfs_root *extent_root = fs_info->extent_root; | |
e37c9e69 | 288 | struct btrfs_path *path; |
5f39d397 | 289 | struct extent_buffer *leaf; |
11833d66 | 290 | struct btrfs_key key; |
817d52f8 | 291 | u64 total_found = 0; |
11833d66 YZ |
292 | u64 last = 0; |
293 | u32 nritems; | |
294 | int ret = 0; | |
f510cfec | 295 | |
e37c9e69 CM |
296 | path = btrfs_alloc_path(); |
297 | if (!path) | |
298 | return -ENOMEM; | |
7d7d6068 | 299 | |
11833d66 | 300 | exclude_super_stripes(extent_root, block_group); |
1b2da372 JB |
301 | spin_lock(&block_group->space_info->lock); |
302 | block_group->space_info->bytes_super += block_group->bytes_super; | |
303 | spin_unlock(&block_group->space_info->lock); | |
11833d66 | 304 | |
817d52f8 | 305 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 306 | |
5cd57b2c | 307 | /* |
817d52f8 JB |
308 | * We don't want to deadlock with somebody trying to allocate a new |
309 | * extent for the extent root while also trying to search the extent | |
310 | * root to add free space. So we skip locking and search the commit | |
311 | * root, since its read-only | |
5cd57b2c CM |
312 | */ |
313 | path->skip_locking = 1; | |
817d52f8 JB |
314 | path->search_commit_root = 1; |
315 | path->reada = 2; | |
316 | ||
e4404d6e | 317 | key.objectid = last; |
e37c9e69 | 318 | key.offset = 0; |
11833d66 | 319 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 320 | again: |
11833d66 | 321 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
322 | /* need to make sure the commit_root doesn't disappear */ |
323 | down_read(&fs_info->extent_commit_sem); | |
324 | ||
11833d66 | 325 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 326 | if (ret < 0) |
ef8bbdfe | 327 | goto err; |
a512bbf8 | 328 | |
11833d66 YZ |
329 | leaf = path->nodes[0]; |
330 | nritems = btrfs_header_nritems(leaf); | |
331 | ||
d397712b | 332 | while (1) { |
817d52f8 | 333 | smp_mb(); |
11833d66 | 334 | if (fs_info->closing > 1) { |
f25784b3 | 335 | last = (u64)-1; |
817d52f8 | 336 | break; |
f25784b3 | 337 | } |
817d52f8 | 338 | |
11833d66 YZ |
339 | if (path->slots[0] < nritems) { |
340 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
341 | } else { | |
342 | ret = find_next_key(path, 0, &key); | |
343 | if (ret) | |
e37c9e69 | 344 | break; |
817d52f8 | 345 | |
11833d66 YZ |
346 | caching_ctl->progress = last; |
347 | btrfs_release_path(extent_root, path); | |
348 | up_read(&fs_info->extent_commit_sem); | |
349 | mutex_unlock(&caching_ctl->mutex); | |
350 | if (btrfs_transaction_in_commit(fs_info)) | |
f36f3042 | 351 | schedule_timeout(1); |
11833d66 YZ |
352 | else |
353 | cond_resched(); | |
354 | goto again; | |
355 | } | |
817d52f8 | 356 | |
11833d66 YZ |
357 | if (key.objectid < block_group->key.objectid) { |
358 | path->slots[0]++; | |
817d52f8 | 359 | continue; |
e37c9e69 | 360 | } |
0f9dd46c | 361 | |
e37c9e69 | 362 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 363 | block_group->key.offset) |
e37c9e69 | 364 | break; |
7d7d6068 | 365 | |
11833d66 | 366 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
367 | total_found += add_new_free_space(block_group, |
368 | fs_info, last, | |
369 | key.objectid); | |
7d7d6068 | 370 | last = key.objectid + key.offset; |
817d52f8 | 371 | |
11833d66 YZ |
372 | if (total_found > (1024 * 1024 * 2)) { |
373 | total_found = 0; | |
374 | wake_up(&caching_ctl->wait); | |
375 | } | |
817d52f8 | 376 | } |
e37c9e69 CM |
377 | path->slots[0]++; |
378 | } | |
817d52f8 | 379 | ret = 0; |
e37c9e69 | 380 | |
817d52f8 JB |
381 | total_found += add_new_free_space(block_group, fs_info, last, |
382 | block_group->key.objectid + | |
383 | block_group->key.offset); | |
11833d66 | 384 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
385 | |
386 | spin_lock(&block_group->lock); | |
11833d66 | 387 | block_group->caching_ctl = NULL; |
817d52f8 JB |
388 | block_group->cached = BTRFS_CACHE_FINISHED; |
389 | spin_unlock(&block_group->lock); | |
0f9dd46c | 390 | |
54aa1f4d | 391 | err: |
e37c9e69 | 392 | btrfs_free_path(path); |
276e680d | 393 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 394 | |
11833d66 YZ |
395 | free_excluded_extents(extent_root, block_group); |
396 | ||
397 | mutex_unlock(&caching_ctl->mutex); | |
398 | wake_up(&caching_ctl->wait); | |
399 | ||
400 | put_caching_control(caching_ctl); | |
401 | atomic_dec(&block_group->space_info->caching_threads); | |
817d52f8 JB |
402 | return 0; |
403 | } | |
404 | ||
405 | static int cache_block_group(struct btrfs_block_group_cache *cache) | |
406 | { | |
11833d66 YZ |
407 | struct btrfs_fs_info *fs_info = cache->fs_info; |
408 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
409 | struct task_struct *tsk; |
410 | int ret = 0; | |
411 | ||
11833d66 YZ |
412 | smp_mb(); |
413 | if (cache->cached != BTRFS_CACHE_NO) | |
414 | return 0; | |
415 | ||
416 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_KERNEL); | |
417 | BUG_ON(!caching_ctl); | |
418 | ||
419 | INIT_LIST_HEAD(&caching_ctl->list); | |
420 | mutex_init(&caching_ctl->mutex); | |
421 | init_waitqueue_head(&caching_ctl->wait); | |
422 | caching_ctl->block_group = cache; | |
423 | caching_ctl->progress = cache->key.objectid; | |
424 | /* one for caching kthread, one for caching block group list */ | |
425 | atomic_set(&caching_ctl->count, 2); | |
426 | ||
817d52f8 JB |
427 | spin_lock(&cache->lock); |
428 | if (cache->cached != BTRFS_CACHE_NO) { | |
429 | spin_unlock(&cache->lock); | |
11833d66 YZ |
430 | kfree(caching_ctl); |
431 | return 0; | |
817d52f8 | 432 | } |
11833d66 | 433 | cache->caching_ctl = caching_ctl; |
817d52f8 JB |
434 | cache->cached = BTRFS_CACHE_STARTED; |
435 | spin_unlock(&cache->lock); | |
436 | ||
11833d66 YZ |
437 | down_write(&fs_info->extent_commit_sem); |
438 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); | |
439 | up_write(&fs_info->extent_commit_sem); | |
440 | ||
441 | atomic_inc(&cache->space_info->caching_threads); | |
442 | ||
817d52f8 JB |
443 | tsk = kthread_run(caching_kthread, cache, "btrfs-cache-%llu\n", |
444 | cache->key.objectid); | |
445 | if (IS_ERR(tsk)) { | |
446 | ret = PTR_ERR(tsk); | |
447 | printk(KERN_ERR "error running thread %d\n", ret); | |
448 | BUG(); | |
449 | } | |
450 | ||
ef8bbdfe | 451 | return ret; |
e37c9e69 CM |
452 | } |
453 | ||
0f9dd46c JB |
454 | /* |
455 | * return the block group that starts at or after bytenr | |
456 | */ | |
d397712b CM |
457 | static struct btrfs_block_group_cache * |
458 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 459 | { |
0f9dd46c | 460 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 461 | |
0f9dd46c | 462 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 463 | |
0f9dd46c | 464 | return cache; |
0ef3e66b CM |
465 | } |
466 | ||
0f9dd46c | 467 | /* |
9f55684c | 468 | * return the block group that contains the given bytenr |
0f9dd46c | 469 | */ |
d397712b CM |
470 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
471 | struct btrfs_fs_info *info, | |
472 | u64 bytenr) | |
be744175 | 473 | { |
0f9dd46c | 474 | struct btrfs_block_group_cache *cache; |
be744175 | 475 | |
0f9dd46c | 476 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 477 | |
0f9dd46c | 478 | return cache; |
be744175 | 479 | } |
0b86a832 | 480 | |
fa9c0d79 | 481 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) |
d2fb3437 YZ |
482 | { |
483 | if (atomic_dec_and_test(&cache->count)) | |
484 | kfree(cache); | |
485 | } | |
486 | ||
0f9dd46c JB |
487 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
488 | u64 flags) | |
6324fbf3 | 489 | { |
0f9dd46c | 490 | struct list_head *head = &info->space_info; |
0f9dd46c | 491 | struct btrfs_space_info *found; |
4184ea7f CM |
492 | |
493 | rcu_read_lock(); | |
494 | list_for_each_entry_rcu(found, head, list) { | |
495 | if (found->flags == flags) { | |
496 | rcu_read_unlock(); | |
0f9dd46c | 497 | return found; |
4184ea7f | 498 | } |
0f9dd46c | 499 | } |
4184ea7f | 500 | rcu_read_unlock(); |
0f9dd46c | 501 | return NULL; |
6324fbf3 CM |
502 | } |
503 | ||
4184ea7f CM |
504 | /* |
505 | * after adding space to the filesystem, we need to clear the full flags | |
506 | * on all the space infos. | |
507 | */ | |
508 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
509 | { | |
510 | struct list_head *head = &info->space_info; | |
511 | struct btrfs_space_info *found; | |
512 | ||
513 | rcu_read_lock(); | |
514 | list_for_each_entry_rcu(found, head, list) | |
515 | found->full = 0; | |
516 | rcu_read_unlock(); | |
517 | } | |
518 | ||
80eb234a JB |
519 | static u64 div_factor(u64 num, int factor) |
520 | { | |
521 | if (factor == 10) | |
522 | return num; | |
523 | num *= factor; | |
524 | do_div(num, 10); | |
525 | return num; | |
526 | } | |
527 | ||
d2fb3437 YZ |
528 | u64 btrfs_find_block_group(struct btrfs_root *root, |
529 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 530 | { |
96b5179d | 531 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 532 | u64 used; |
d2fb3437 YZ |
533 | u64 last = max(search_hint, search_start); |
534 | u64 group_start = 0; | |
31f3c99b | 535 | int full_search = 0; |
d2fb3437 | 536 | int factor = 9; |
0ef3e66b | 537 | int wrapped = 0; |
31f3c99b | 538 | again: |
e8569813 ZY |
539 | while (1) { |
540 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
541 | if (!cache) |
542 | break; | |
96b5179d | 543 | |
c286ac48 | 544 | spin_lock(&cache->lock); |
96b5179d CM |
545 | last = cache->key.objectid + cache->key.offset; |
546 | used = btrfs_block_group_used(&cache->item); | |
547 | ||
d2fb3437 YZ |
548 | if ((full_search || !cache->ro) && |
549 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 550 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
551 | div_factor(cache->key.offset, factor)) { |
552 | group_start = cache->key.objectid; | |
c286ac48 | 553 | spin_unlock(&cache->lock); |
fa9c0d79 | 554 | btrfs_put_block_group(cache); |
8790d502 CM |
555 | goto found; |
556 | } | |
6324fbf3 | 557 | } |
c286ac48 | 558 | spin_unlock(&cache->lock); |
fa9c0d79 | 559 | btrfs_put_block_group(cache); |
de428b63 | 560 | cond_resched(); |
cd1bc465 | 561 | } |
0ef3e66b CM |
562 | if (!wrapped) { |
563 | last = search_start; | |
564 | wrapped = 1; | |
565 | goto again; | |
566 | } | |
567 | if (!full_search && factor < 10) { | |
be744175 | 568 | last = search_start; |
31f3c99b | 569 | full_search = 1; |
0ef3e66b | 570 | factor = 10; |
31f3c99b CM |
571 | goto again; |
572 | } | |
be744175 | 573 | found: |
d2fb3437 | 574 | return group_start; |
925baedd | 575 | } |
0f9dd46c | 576 | |
e02119d5 | 577 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 578 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
579 | { |
580 | int ret; | |
581 | struct btrfs_key key; | |
31840ae1 | 582 | struct btrfs_path *path; |
e02119d5 | 583 | |
31840ae1 ZY |
584 | path = btrfs_alloc_path(); |
585 | BUG_ON(!path); | |
e02119d5 CM |
586 | key.objectid = start; |
587 | key.offset = len; | |
588 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
589 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
590 | 0, 0); | |
31840ae1 | 591 | btrfs_free_path(path); |
7bb86316 CM |
592 | return ret; |
593 | } | |
594 | ||
d8d5f3e1 CM |
595 | /* |
596 | * Back reference rules. Back refs have three main goals: | |
597 | * | |
598 | * 1) differentiate between all holders of references to an extent so that | |
599 | * when a reference is dropped we can make sure it was a valid reference | |
600 | * before freeing the extent. | |
601 | * | |
602 | * 2) Provide enough information to quickly find the holders of an extent | |
603 | * if we notice a given block is corrupted or bad. | |
604 | * | |
605 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
606 | * maintenance. This is actually the same as #2, but with a slightly | |
607 | * different use case. | |
608 | * | |
5d4f98a2 YZ |
609 | * There are two kinds of back refs. The implicit back refs is optimized |
610 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
611 | * back refs of this kind provide information about the block's owner tree | |
612 | * and the pointer's key. These information allow us to find the block by | |
613 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
614 | * referenced by their owner trees. The location of tree block is recorded | |
615 | * in the back refs. Actually the full back refs is generic, and can be | |
616 | * used in all cases the implicit back refs is used. The major shortcoming | |
617 | * of the full back refs is its overhead. Every time a tree block gets | |
618 | * COWed, we have to update back refs entry for all pointers in it. | |
619 | * | |
620 | * For a newly allocated tree block, we use implicit back refs for | |
621 | * pointers in it. This means most tree related operations only involve | |
622 | * implicit back refs. For a tree block created in old transaction, the | |
623 | * only way to drop a reference to it is COW it. So we can detect the | |
624 | * event that tree block loses its owner tree's reference and do the | |
625 | * back refs conversion. | |
626 | * | |
627 | * When a tree block is COW'd through a tree, there are four cases: | |
628 | * | |
629 | * The reference count of the block is one and the tree is the block's | |
630 | * owner tree. Nothing to do in this case. | |
631 | * | |
632 | * The reference count of the block is one and the tree is not the | |
633 | * block's owner tree. In this case, full back refs is used for pointers | |
634 | * in the block. Remove these full back refs, add implicit back refs for | |
635 | * every pointers in the new block. | |
636 | * | |
637 | * The reference count of the block is greater than one and the tree is | |
638 | * the block's owner tree. In this case, implicit back refs is used for | |
639 | * pointers in the block. Add full back refs for every pointers in the | |
640 | * block, increase lower level extents' reference counts. The original | |
641 | * implicit back refs are entailed to the new block. | |
642 | * | |
643 | * The reference count of the block is greater than one and the tree is | |
644 | * not the block's owner tree. Add implicit back refs for every pointer in | |
645 | * the new block, increase lower level extents' reference count. | |
646 | * | |
647 | * Back Reference Key composing: | |
648 | * | |
649 | * The key objectid corresponds to the first byte in the extent, | |
650 | * The key type is used to differentiate between types of back refs. | |
651 | * There are different meanings of the key offset for different types | |
652 | * of back refs. | |
653 | * | |
d8d5f3e1 CM |
654 | * File extents can be referenced by: |
655 | * | |
656 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 657 | * - different files inside a single subvolume |
d8d5f3e1 CM |
658 | * - different offsets inside a file (bookend extents in file.c) |
659 | * | |
5d4f98a2 | 660 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
661 | * |
662 | * - Objectid of the subvolume root | |
d8d5f3e1 | 663 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
664 | * - original offset in the file |
665 | * - how many bookend extents | |
d8d5f3e1 | 666 | * |
5d4f98a2 YZ |
667 | * The key offset for the implicit back refs is hash of the first |
668 | * three fields. | |
d8d5f3e1 | 669 | * |
5d4f98a2 | 670 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 671 | * |
5d4f98a2 | 672 | * - number of pointers in the tree leaf |
d8d5f3e1 | 673 | * |
5d4f98a2 YZ |
674 | * The key offset for the implicit back refs is the first byte of |
675 | * the tree leaf | |
d8d5f3e1 | 676 | * |
5d4f98a2 YZ |
677 | * When a file extent is allocated, The implicit back refs is used. |
678 | * the fields are filled in: | |
d8d5f3e1 | 679 | * |
5d4f98a2 | 680 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 681 | * |
5d4f98a2 YZ |
682 | * When a file extent is removed file truncation, we find the |
683 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 684 | * |
5d4f98a2 | 685 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 686 | * |
5d4f98a2 | 687 | * Btree extents can be referenced by: |
d8d5f3e1 | 688 | * |
5d4f98a2 | 689 | * - Different subvolumes |
d8d5f3e1 | 690 | * |
5d4f98a2 YZ |
691 | * Both the implicit back refs and the full back refs for tree blocks |
692 | * only consist of key. The key offset for the implicit back refs is | |
693 | * objectid of block's owner tree. The key offset for the full back refs | |
694 | * is the first byte of parent block. | |
d8d5f3e1 | 695 | * |
5d4f98a2 YZ |
696 | * When implicit back refs is used, information about the lowest key and |
697 | * level of the tree block are required. These information are stored in | |
698 | * tree block info structure. | |
d8d5f3e1 | 699 | */ |
31840ae1 | 700 | |
5d4f98a2 YZ |
701 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
702 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
703 | struct btrfs_root *root, | |
704 | struct btrfs_path *path, | |
705 | u64 owner, u32 extra_size) | |
7bb86316 | 706 | { |
5d4f98a2 YZ |
707 | struct btrfs_extent_item *item; |
708 | struct btrfs_extent_item_v0 *ei0; | |
709 | struct btrfs_extent_ref_v0 *ref0; | |
710 | struct btrfs_tree_block_info *bi; | |
711 | struct extent_buffer *leaf; | |
7bb86316 | 712 | struct btrfs_key key; |
5d4f98a2 YZ |
713 | struct btrfs_key found_key; |
714 | u32 new_size = sizeof(*item); | |
715 | u64 refs; | |
716 | int ret; | |
717 | ||
718 | leaf = path->nodes[0]; | |
719 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
720 | ||
721 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
722 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
723 | struct btrfs_extent_item_v0); | |
724 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
725 | ||
726 | if (owner == (u64)-1) { | |
727 | while (1) { | |
728 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
729 | ret = btrfs_next_leaf(root, path); | |
730 | if (ret < 0) | |
731 | return ret; | |
732 | BUG_ON(ret > 0); | |
733 | leaf = path->nodes[0]; | |
734 | } | |
735 | btrfs_item_key_to_cpu(leaf, &found_key, | |
736 | path->slots[0]); | |
737 | BUG_ON(key.objectid != found_key.objectid); | |
738 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
739 | path->slots[0]++; | |
740 | continue; | |
741 | } | |
742 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
743 | struct btrfs_extent_ref_v0); | |
744 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
745 | break; | |
746 | } | |
747 | } | |
748 | btrfs_release_path(root, path); | |
749 | ||
750 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
751 | new_size += sizeof(*bi); | |
752 | ||
753 | new_size -= sizeof(*ei0); | |
754 | ret = btrfs_search_slot(trans, root, &key, path, | |
755 | new_size + extra_size, 1); | |
756 | if (ret < 0) | |
757 | return ret; | |
758 | BUG_ON(ret); | |
759 | ||
760 | ret = btrfs_extend_item(trans, root, path, new_size); | |
761 | BUG_ON(ret); | |
762 | ||
763 | leaf = path->nodes[0]; | |
764 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
765 | btrfs_set_extent_refs(leaf, item, refs); | |
766 | /* FIXME: get real generation */ | |
767 | btrfs_set_extent_generation(leaf, item, 0); | |
768 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
769 | btrfs_set_extent_flags(leaf, item, | |
770 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
771 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
772 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
773 | /* FIXME: get first key of the block */ | |
774 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
775 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
776 | } else { | |
777 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
778 | } | |
779 | btrfs_mark_buffer_dirty(leaf); | |
780 | return 0; | |
781 | } | |
782 | #endif | |
783 | ||
784 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
785 | { | |
786 | u32 high_crc = ~(u32)0; | |
787 | u32 low_crc = ~(u32)0; | |
788 | __le64 lenum; | |
789 | ||
790 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 791 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 792 | lenum = cpu_to_le64(owner); |
163e783e | 793 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 794 | lenum = cpu_to_le64(offset); |
163e783e | 795 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
796 | |
797 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
798 | } | |
799 | ||
800 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
801 | struct btrfs_extent_data_ref *ref) | |
802 | { | |
803 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
804 | btrfs_extent_data_ref_objectid(leaf, ref), | |
805 | btrfs_extent_data_ref_offset(leaf, ref)); | |
806 | } | |
807 | ||
808 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
809 | struct btrfs_extent_data_ref *ref, | |
810 | u64 root_objectid, u64 owner, u64 offset) | |
811 | { | |
812 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
813 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
814 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
815 | return 0; | |
816 | return 1; | |
817 | } | |
818 | ||
819 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
820 | struct btrfs_root *root, | |
821 | struct btrfs_path *path, | |
822 | u64 bytenr, u64 parent, | |
823 | u64 root_objectid, | |
824 | u64 owner, u64 offset) | |
825 | { | |
826 | struct btrfs_key key; | |
827 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 828 | struct extent_buffer *leaf; |
5d4f98a2 | 829 | u32 nritems; |
74493f7a | 830 | int ret; |
5d4f98a2 YZ |
831 | int recow; |
832 | int err = -ENOENT; | |
74493f7a | 833 | |
31840ae1 | 834 | key.objectid = bytenr; |
5d4f98a2 YZ |
835 | if (parent) { |
836 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
837 | key.offset = parent; | |
838 | } else { | |
839 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
840 | key.offset = hash_extent_data_ref(root_objectid, | |
841 | owner, offset); | |
842 | } | |
843 | again: | |
844 | recow = 0; | |
845 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
846 | if (ret < 0) { | |
847 | err = ret; | |
848 | goto fail; | |
849 | } | |
31840ae1 | 850 | |
5d4f98a2 YZ |
851 | if (parent) { |
852 | if (!ret) | |
853 | return 0; | |
854 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
855 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
856 | btrfs_release_path(root, path); | |
857 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
858 | if (ret < 0) { | |
859 | err = ret; | |
860 | goto fail; | |
861 | } | |
862 | if (!ret) | |
863 | return 0; | |
864 | #endif | |
865 | goto fail; | |
31840ae1 ZY |
866 | } |
867 | ||
868 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
869 | nritems = btrfs_header_nritems(leaf); |
870 | while (1) { | |
871 | if (path->slots[0] >= nritems) { | |
872 | ret = btrfs_next_leaf(root, path); | |
873 | if (ret < 0) | |
874 | err = ret; | |
875 | if (ret) | |
876 | goto fail; | |
877 | ||
878 | leaf = path->nodes[0]; | |
879 | nritems = btrfs_header_nritems(leaf); | |
880 | recow = 1; | |
881 | } | |
882 | ||
883 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
884 | if (key.objectid != bytenr || | |
885 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
886 | goto fail; | |
887 | ||
888 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
889 | struct btrfs_extent_data_ref); | |
890 | ||
891 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
892 | owner, offset)) { | |
893 | if (recow) { | |
894 | btrfs_release_path(root, path); | |
895 | goto again; | |
896 | } | |
897 | err = 0; | |
898 | break; | |
899 | } | |
900 | path->slots[0]++; | |
31840ae1 | 901 | } |
5d4f98a2 YZ |
902 | fail: |
903 | return err; | |
31840ae1 ZY |
904 | } |
905 | ||
5d4f98a2 YZ |
906 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
907 | struct btrfs_root *root, | |
908 | struct btrfs_path *path, | |
909 | u64 bytenr, u64 parent, | |
910 | u64 root_objectid, u64 owner, | |
911 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
912 | { |
913 | struct btrfs_key key; | |
914 | struct extent_buffer *leaf; | |
5d4f98a2 | 915 | u32 size; |
31840ae1 ZY |
916 | u32 num_refs; |
917 | int ret; | |
74493f7a | 918 | |
74493f7a | 919 | key.objectid = bytenr; |
5d4f98a2 YZ |
920 | if (parent) { |
921 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
922 | key.offset = parent; | |
923 | size = sizeof(struct btrfs_shared_data_ref); | |
924 | } else { | |
925 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
926 | key.offset = hash_extent_data_ref(root_objectid, | |
927 | owner, offset); | |
928 | size = sizeof(struct btrfs_extent_data_ref); | |
929 | } | |
74493f7a | 930 | |
5d4f98a2 YZ |
931 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
932 | if (ret && ret != -EEXIST) | |
933 | goto fail; | |
934 | ||
935 | leaf = path->nodes[0]; | |
936 | if (parent) { | |
937 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 938 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
939 | struct btrfs_shared_data_ref); |
940 | if (ret == 0) { | |
941 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
942 | } else { | |
943 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
944 | num_refs += refs_to_add; | |
945 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 946 | } |
5d4f98a2 YZ |
947 | } else { |
948 | struct btrfs_extent_data_ref *ref; | |
949 | while (ret == -EEXIST) { | |
950 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
951 | struct btrfs_extent_data_ref); | |
952 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
953 | owner, offset)) | |
954 | break; | |
955 | btrfs_release_path(root, path); | |
956 | key.offset++; | |
957 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
958 | size); | |
959 | if (ret && ret != -EEXIST) | |
960 | goto fail; | |
31840ae1 | 961 | |
5d4f98a2 YZ |
962 | leaf = path->nodes[0]; |
963 | } | |
964 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
965 | struct btrfs_extent_data_ref); | |
966 | if (ret == 0) { | |
967 | btrfs_set_extent_data_ref_root(leaf, ref, | |
968 | root_objectid); | |
969 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
970 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
971 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
972 | } else { | |
973 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
974 | num_refs += refs_to_add; | |
975 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 976 | } |
31840ae1 | 977 | } |
5d4f98a2 YZ |
978 | btrfs_mark_buffer_dirty(leaf); |
979 | ret = 0; | |
980 | fail: | |
7bb86316 CM |
981 | btrfs_release_path(root, path); |
982 | return ret; | |
74493f7a CM |
983 | } |
984 | ||
5d4f98a2 YZ |
985 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
986 | struct btrfs_root *root, | |
987 | struct btrfs_path *path, | |
988 | int refs_to_drop) | |
31840ae1 | 989 | { |
5d4f98a2 YZ |
990 | struct btrfs_key key; |
991 | struct btrfs_extent_data_ref *ref1 = NULL; | |
992 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 993 | struct extent_buffer *leaf; |
5d4f98a2 | 994 | u32 num_refs = 0; |
31840ae1 ZY |
995 | int ret = 0; |
996 | ||
997 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
998 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
999 | ||
1000 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1001 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1002 | struct btrfs_extent_data_ref); | |
1003 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1004 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1005 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1006 | struct btrfs_shared_data_ref); | |
1007 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1008 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1009 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1010 | struct btrfs_extent_ref_v0 *ref0; | |
1011 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1012 | struct btrfs_extent_ref_v0); | |
1013 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1014 | #endif | |
1015 | } else { | |
1016 | BUG(); | |
1017 | } | |
1018 | ||
56bec294 CM |
1019 | BUG_ON(num_refs < refs_to_drop); |
1020 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1021 | |
31840ae1 ZY |
1022 | if (num_refs == 0) { |
1023 | ret = btrfs_del_item(trans, root, path); | |
1024 | } else { | |
5d4f98a2 YZ |
1025 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1026 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1027 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1028 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1029 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1030 | else { | |
1031 | struct btrfs_extent_ref_v0 *ref0; | |
1032 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1033 | struct btrfs_extent_ref_v0); | |
1034 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1035 | } | |
1036 | #endif | |
31840ae1 ZY |
1037 | btrfs_mark_buffer_dirty(leaf); |
1038 | } | |
31840ae1 ZY |
1039 | return ret; |
1040 | } | |
1041 | ||
5d4f98a2 YZ |
1042 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1043 | struct btrfs_path *path, | |
1044 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1045 | { |
5d4f98a2 YZ |
1046 | struct btrfs_key key; |
1047 | struct extent_buffer *leaf; | |
1048 | struct btrfs_extent_data_ref *ref1; | |
1049 | struct btrfs_shared_data_ref *ref2; | |
1050 | u32 num_refs = 0; | |
1051 | ||
1052 | leaf = path->nodes[0]; | |
1053 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1054 | if (iref) { | |
1055 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1056 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1057 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1058 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1059 | } else { | |
1060 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1061 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1062 | } | |
1063 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1064 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1065 | struct btrfs_extent_data_ref); | |
1066 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1067 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1068 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1069 | struct btrfs_shared_data_ref); | |
1070 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1071 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1072 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1073 | struct btrfs_extent_ref_v0 *ref0; | |
1074 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1075 | struct btrfs_extent_ref_v0); | |
1076 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1077 | #endif |
5d4f98a2 YZ |
1078 | } else { |
1079 | WARN_ON(1); | |
1080 | } | |
1081 | return num_refs; | |
1082 | } | |
15916de8 | 1083 | |
5d4f98a2 YZ |
1084 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1085 | struct btrfs_root *root, | |
1086 | struct btrfs_path *path, | |
1087 | u64 bytenr, u64 parent, | |
1088 | u64 root_objectid) | |
1f3c79a2 | 1089 | { |
5d4f98a2 | 1090 | struct btrfs_key key; |
1f3c79a2 | 1091 | int ret; |
1f3c79a2 | 1092 | |
5d4f98a2 YZ |
1093 | key.objectid = bytenr; |
1094 | if (parent) { | |
1095 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1096 | key.offset = parent; | |
1097 | } else { | |
1098 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1099 | key.offset = root_objectid; | |
1f3c79a2 LH |
1100 | } |
1101 | ||
5d4f98a2 YZ |
1102 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1103 | if (ret > 0) | |
1104 | ret = -ENOENT; | |
1105 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1106 | if (ret == -ENOENT && parent) { | |
1107 | btrfs_release_path(root, path); | |
1108 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1109 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1110 | if (ret > 0) | |
1111 | ret = -ENOENT; | |
1112 | } | |
1f3c79a2 | 1113 | #endif |
5d4f98a2 | 1114 | return ret; |
1f3c79a2 LH |
1115 | } |
1116 | ||
5d4f98a2 YZ |
1117 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1118 | struct btrfs_root *root, | |
1119 | struct btrfs_path *path, | |
1120 | u64 bytenr, u64 parent, | |
1121 | u64 root_objectid) | |
31840ae1 | 1122 | { |
5d4f98a2 | 1123 | struct btrfs_key key; |
31840ae1 | 1124 | int ret; |
31840ae1 | 1125 | |
5d4f98a2 YZ |
1126 | key.objectid = bytenr; |
1127 | if (parent) { | |
1128 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1129 | key.offset = parent; | |
1130 | } else { | |
1131 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1132 | key.offset = root_objectid; | |
1133 | } | |
1134 | ||
1135 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1136 | btrfs_release_path(root, path); | |
31840ae1 ZY |
1137 | return ret; |
1138 | } | |
1139 | ||
5d4f98a2 | 1140 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1141 | { |
5d4f98a2 YZ |
1142 | int type; |
1143 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1144 | if (parent > 0) | |
1145 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1146 | else | |
1147 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1148 | } else { | |
1149 | if (parent > 0) | |
1150 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1151 | else | |
1152 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1153 | } | |
1154 | return type; | |
31840ae1 | 1155 | } |
56bec294 | 1156 | |
2c47e605 YZ |
1157 | static int find_next_key(struct btrfs_path *path, int level, |
1158 | struct btrfs_key *key) | |
56bec294 | 1159 | |
02217ed2 | 1160 | { |
2c47e605 | 1161 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1162 | if (!path->nodes[level]) |
1163 | break; | |
5d4f98a2 YZ |
1164 | if (path->slots[level] + 1 >= |
1165 | btrfs_header_nritems(path->nodes[level])) | |
1166 | continue; | |
1167 | if (level == 0) | |
1168 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1169 | path->slots[level] + 1); | |
1170 | else | |
1171 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1172 | path->slots[level] + 1); | |
1173 | return 0; | |
1174 | } | |
1175 | return 1; | |
1176 | } | |
037e6390 | 1177 | |
5d4f98a2 YZ |
1178 | /* |
1179 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1180 | * to the address of inline back ref, and 0 is returned. | |
1181 | * | |
1182 | * if back ref isn't found, *ref_ret is set to the address where it | |
1183 | * should be inserted, and -ENOENT is returned. | |
1184 | * | |
1185 | * if insert is true and there are too many inline back refs, the path | |
1186 | * points to the extent item, and -EAGAIN is returned. | |
1187 | * | |
1188 | * NOTE: inline back refs are ordered in the same way that back ref | |
1189 | * items in the tree are ordered. | |
1190 | */ | |
1191 | static noinline_for_stack | |
1192 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1193 | struct btrfs_root *root, | |
1194 | struct btrfs_path *path, | |
1195 | struct btrfs_extent_inline_ref **ref_ret, | |
1196 | u64 bytenr, u64 num_bytes, | |
1197 | u64 parent, u64 root_objectid, | |
1198 | u64 owner, u64 offset, int insert) | |
1199 | { | |
1200 | struct btrfs_key key; | |
1201 | struct extent_buffer *leaf; | |
1202 | struct btrfs_extent_item *ei; | |
1203 | struct btrfs_extent_inline_ref *iref; | |
1204 | u64 flags; | |
1205 | u64 item_size; | |
1206 | unsigned long ptr; | |
1207 | unsigned long end; | |
1208 | int extra_size; | |
1209 | int type; | |
1210 | int want; | |
1211 | int ret; | |
1212 | int err = 0; | |
26b8003f | 1213 | |
db94535d | 1214 | key.objectid = bytenr; |
31840ae1 | 1215 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1216 | key.offset = num_bytes; |
31840ae1 | 1217 | |
5d4f98a2 YZ |
1218 | want = extent_ref_type(parent, owner); |
1219 | if (insert) { | |
1220 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1221 | path->keep_locks = 1; |
5d4f98a2 YZ |
1222 | } else |
1223 | extra_size = -1; | |
1224 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1225 | if (ret < 0) { |
5d4f98a2 YZ |
1226 | err = ret; |
1227 | goto out; | |
1228 | } | |
1229 | BUG_ON(ret); | |
1230 | ||
1231 | leaf = path->nodes[0]; | |
1232 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1233 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1234 | if (item_size < sizeof(*ei)) { | |
1235 | if (!insert) { | |
1236 | err = -ENOENT; | |
1237 | goto out; | |
1238 | } | |
1239 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1240 | extra_size); | |
1241 | if (ret < 0) { | |
1242 | err = ret; | |
1243 | goto out; | |
1244 | } | |
1245 | leaf = path->nodes[0]; | |
1246 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1247 | } | |
1248 | #endif | |
1249 | BUG_ON(item_size < sizeof(*ei)); | |
1250 | ||
5d4f98a2 YZ |
1251 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1252 | flags = btrfs_extent_flags(leaf, ei); | |
1253 | ||
1254 | ptr = (unsigned long)(ei + 1); | |
1255 | end = (unsigned long)ei + item_size; | |
1256 | ||
1257 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1258 | ptr += sizeof(struct btrfs_tree_block_info); | |
1259 | BUG_ON(ptr > end); | |
1260 | } else { | |
1261 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1262 | } | |
1263 | ||
1264 | err = -ENOENT; | |
1265 | while (1) { | |
1266 | if (ptr >= end) { | |
1267 | WARN_ON(ptr > end); | |
1268 | break; | |
1269 | } | |
1270 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1271 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1272 | if (want < type) | |
1273 | break; | |
1274 | if (want > type) { | |
1275 | ptr += btrfs_extent_inline_ref_size(type); | |
1276 | continue; | |
1277 | } | |
1278 | ||
1279 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1280 | struct btrfs_extent_data_ref *dref; | |
1281 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1282 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1283 | owner, offset)) { | |
1284 | err = 0; | |
1285 | break; | |
1286 | } | |
1287 | if (hash_extent_data_ref_item(leaf, dref) < | |
1288 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1289 | break; | |
1290 | } else { | |
1291 | u64 ref_offset; | |
1292 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1293 | if (parent > 0) { | |
1294 | if (parent == ref_offset) { | |
1295 | err = 0; | |
1296 | break; | |
1297 | } | |
1298 | if (ref_offset < parent) | |
1299 | break; | |
1300 | } else { | |
1301 | if (root_objectid == ref_offset) { | |
1302 | err = 0; | |
1303 | break; | |
1304 | } | |
1305 | if (ref_offset < root_objectid) | |
1306 | break; | |
1307 | } | |
1308 | } | |
1309 | ptr += btrfs_extent_inline_ref_size(type); | |
1310 | } | |
1311 | if (err == -ENOENT && insert) { | |
1312 | if (item_size + extra_size >= | |
1313 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1314 | err = -EAGAIN; | |
1315 | goto out; | |
1316 | } | |
1317 | /* | |
1318 | * To add new inline back ref, we have to make sure | |
1319 | * there is no corresponding back ref item. | |
1320 | * For simplicity, we just do not add new inline back | |
1321 | * ref if there is any kind of item for this block | |
1322 | */ | |
2c47e605 YZ |
1323 | if (find_next_key(path, 0, &key) == 0 && |
1324 | key.objectid == bytenr && | |
85d4198e | 1325 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1326 | err = -EAGAIN; |
1327 | goto out; | |
1328 | } | |
1329 | } | |
1330 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1331 | out: | |
85d4198e | 1332 | if (insert) { |
5d4f98a2 YZ |
1333 | path->keep_locks = 0; |
1334 | btrfs_unlock_up_safe(path, 1); | |
1335 | } | |
1336 | return err; | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * helper to add new inline back ref | |
1341 | */ | |
1342 | static noinline_for_stack | |
1343 | int setup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1344 | struct btrfs_root *root, | |
1345 | struct btrfs_path *path, | |
1346 | struct btrfs_extent_inline_ref *iref, | |
1347 | u64 parent, u64 root_objectid, | |
1348 | u64 owner, u64 offset, int refs_to_add, | |
1349 | struct btrfs_delayed_extent_op *extent_op) | |
1350 | { | |
1351 | struct extent_buffer *leaf; | |
1352 | struct btrfs_extent_item *ei; | |
1353 | unsigned long ptr; | |
1354 | unsigned long end; | |
1355 | unsigned long item_offset; | |
1356 | u64 refs; | |
1357 | int size; | |
1358 | int type; | |
1359 | int ret; | |
1360 | ||
1361 | leaf = path->nodes[0]; | |
1362 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1363 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1364 | ||
1365 | type = extent_ref_type(parent, owner); | |
1366 | size = btrfs_extent_inline_ref_size(type); | |
1367 | ||
1368 | ret = btrfs_extend_item(trans, root, path, size); | |
1369 | BUG_ON(ret); | |
1370 | ||
1371 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1372 | refs = btrfs_extent_refs(leaf, ei); | |
1373 | refs += refs_to_add; | |
1374 | btrfs_set_extent_refs(leaf, ei, refs); | |
1375 | if (extent_op) | |
1376 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1377 | ||
1378 | ptr = (unsigned long)ei + item_offset; | |
1379 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1380 | if (ptr < end - size) | |
1381 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1382 | end - size - ptr); | |
1383 | ||
1384 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1385 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1386 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1387 | struct btrfs_extent_data_ref *dref; | |
1388 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1389 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1390 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1391 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1392 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1393 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1394 | struct btrfs_shared_data_ref *sref; | |
1395 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1396 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1397 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1398 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1399 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1400 | } else { | |
1401 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1402 | } | |
1403 | btrfs_mark_buffer_dirty(leaf); | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1408 | struct btrfs_root *root, | |
1409 | struct btrfs_path *path, | |
1410 | struct btrfs_extent_inline_ref **ref_ret, | |
1411 | u64 bytenr, u64 num_bytes, u64 parent, | |
1412 | u64 root_objectid, u64 owner, u64 offset) | |
1413 | { | |
1414 | int ret; | |
1415 | ||
1416 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1417 | bytenr, num_bytes, parent, | |
1418 | root_objectid, owner, offset, 0); | |
1419 | if (ret != -ENOENT) | |
54aa1f4d | 1420 | return ret; |
5d4f98a2 YZ |
1421 | |
1422 | btrfs_release_path(root, path); | |
1423 | *ref_ret = NULL; | |
1424 | ||
1425 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1426 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1427 | root_objectid); | |
1428 | } else { | |
1429 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1430 | root_objectid, owner, offset); | |
b9473439 | 1431 | } |
5d4f98a2 YZ |
1432 | return ret; |
1433 | } | |
31840ae1 | 1434 | |
5d4f98a2 YZ |
1435 | /* |
1436 | * helper to update/remove inline back ref | |
1437 | */ | |
1438 | static noinline_for_stack | |
1439 | int update_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1440 | struct btrfs_root *root, | |
1441 | struct btrfs_path *path, | |
1442 | struct btrfs_extent_inline_ref *iref, | |
1443 | int refs_to_mod, | |
1444 | struct btrfs_delayed_extent_op *extent_op) | |
1445 | { | |
1446 | struct extent_buffer *leaf; | |
1447 | struct btrfs_extent_item *ei; | |
1448 | struct btrfs_extent_data_ref *dref = NULL; | |
1449 | struct btrfs_shared_data_ref *sref = NULL; | |
1450 | unsigned long ptr; | |
1451 | unsigned long end; | |
1452 | u32 item_size; | |
1453 | int size; | |
1454 | int type; | |
1455 | int ret; | |
1456 | u64 refs; | |
1457 | ||
1458 | leaf = path->nodes[0]; | |
1459 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1460 | refs = btrfs_extent_refs(leaf, ei); | |
1461 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1462 | refs += refs_to_mod; | |
1463 | btrfs_set_extent_refs(leaf, ei, refs); | |
1464 | if (extent_op) | |
1465 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1466 | ||
1467 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1468 | ||
1469 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1470 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1471 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1472 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1473 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1474 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1475 | } else { | |
1476 | refs = 1; | |
1477 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1478 | } |
31840ae1 | 1479 | |
5d4f98a2 YZ |
1480 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1481 | refs += refs_to_mod; | |
1482 | ||
1483 | if (refs > 0) { | |
1484 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1485 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1486 | else | |
1487 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1488 | } else { | |
1489 | size = btrfs_extent_inline_ref_size(type); | |
1490 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1491 | ptr = (unsigned long)iref; | |
1492 | end = (unsigned long)ei + item_size; | |
1493 | if (ptr + size < end) | |
1494 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1495 | end - ptr - size); | |
1496 | item_size -= size; | |
1497 | ret = btrfs_truncate_item(trans, root, path, item_size, 1); | |
1498 | BUG_ON(ret); | |
1499 | } | |
1500 | btrfs_mark_buffer_dirty(leaf); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | static noinline_for_stack | |
1505 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1506 | struct btrfs_root *root, | |
1507 | struct btrfs_path *path, | |
1508 | u64 bytenr, u64 num_bytes, u64 parent, | |
1509 | u64 root_objectid, u64 owner, | |
1510 | u64 offset, int refs_to_add, | |
1511 | struct btrfs_delayed_extent_op *extent_op) | |
1512 | { | |
1513 | struct btrfs_extent_inline_ref *iref; | |
1514 | int ret; | |
1515 | ||
1516 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1517 | bytenr, num_bytes, parent, | |
1518 | root_objectid, owner, offset, 1); | |
1519 | if (ret == 0) { | |
1520 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1521 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1522 | refs_to_add, extent_op); | |
1523 | } else if (ret == -ENOENT) { | |
1524 | ret = setup_inline_extent_backref(trans, root, path, iref, | |
1525 | parent, root_objectid, | |
1526 | owner, offset, refs_to_add, | |
1527 | extent_op); | |
771ed689 | 1528 | } |
5d4f98a2 YZ |
1529 | return ret; |
1530 | } | |
31840ae1 | 1531 | |
5d4f98a2 YZ |
1532 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1533 | struct btrfs_root *root, | |
1534 | struct btrfs_path *path, | |
1535 | u64 bytenr, u64 parent, u64 root_objectid, | |
1536 | u64 owner, u64 offset, int refs_to_add) | |
1537 | { | |
1538 | int ret; | |
1539 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1540 | BUG_ON(refs_to_add != 1); | |
1541 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1542 | parent, root_objectid); | |
1543 | } else { | |
1544 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1545 | parent, root_objectid, | |
1546 | owner, offset, refs_to_add); | |
1547 | } | |
1548 | return ret; | |
1549 | } | |
56bec294 | 1550 | |
5d4f98a2 YZ |
1551 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1552 | struct btrfs_root *root, | |
1553 | struct btrfs_path *path, | |
1554 | struct btrfs_extent_inline_ref *iref, | |
1555 | int refs_to_drop, int is_data) | |
1556 | { | |
1557 | int ret; | |
b9473439 | 1558 | |
5d4f98a2 YZ |
1559 | BUG_ON(!is_data && refs_to_drop != 1); |
1560 | if (iref) { | |
1561 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1562 | -refs_to_drop, NULL); | |
1563 | } else if (is_data) { | |
1564 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1565 | } else { | |
1566 | ret = btrfs_del_item(trans, root, path); | |
1567 | } | |
1568 | return ret; | |
1569 | } | |
1570 | ||
5d4f98a2 YZ |
1571 | static void btrfs_issue_discard(struct block_device *bdev, |
1572 | u64 start, u64 len) | |
1573 | { | |
1574 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); | |
1575 | } | |
5d4f98a2 YZ |
1576 | |
1577 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
1578 | u64 num_bytes) | |
1579 | { | |
5d4f98a2 YZ |
1580 | int ret; |
1581 | u64 map_length = num_bytes; | |
1582 | struct btrfs_multi_bio *multi = NULL; | |
1583 | ||
e244a0ae CH |
1584 | if (!btrfs_test_opt(root, DISCARD)) |
1585 | return 0; | |
1586 | ||
5d4f98a2 YZ |
1587 | /* Tell the block device(s) that the sectors can be discarded */ |
1588 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
1589 | bytenr, &map_length, &multi, 0); | |
1590 | if (!ret) { | |
1591 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
1592 | int i; | |
1593 | ||
1594 | if (map_length > num_bytes) | |
1595 | map_length = num_bytes; | |
1596 | ||
1597 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
1598 | btrfs_issue_discard(stripe->dev->bdev, | |
1599 | stripe->physical, | |
1600 | map_length); | |
1601 | } | |
1602 | kfree(multi); | |
1603 | } | |
1604 | ||
1605 | return ret; | |
5d4f98a2 YZ |
1606 | } |
1607 | ||
1608 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1609 | struct btrfs_root *root, | |
1610 | u64 bytenr, u64 num_bytes, u64 parent, | |
1611 | u64 root_objectid, u64 owner, u64 offset) | |
1612 | { | |
1613 | int ret; | |
1614 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1615 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1616 | ||
1617 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1618 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
1619 | parent, root_objectid, (int)owner, | |
1620 | BTRFS_ADD_DELAYED_REF, NULL); | |
1621 | } else { | |
1622 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
1623 | parent, root_objectid, owner, offset, | |
1624 | BTRFS_ADD_DELAYED_REF, NULL); | |
1625 | } | |
1626 | return ret; | |
1627 | } | |
1628 | ||
1629 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1630 | struct btrfs_root *root, | |
1631 | u64 bytenr, u64 num_bytes, | |
1632 | u64 parent, u64 root_objectid, | |
1633 | u64 owner, u64 offset, int refs_to_add, | |
1634 | struct btrfs_delayed_extent_op *extent_op) | |
1635 | { | |
1636 | struct btrfs_path *path; | |
1637 | struct extent_buffer *leaf; | |
1638 | struct btrfs_extent_item *item; | |
1639 | u64 refs; | |
1640 | int ret; | |
1641 | int err = 0; | |
1642 | ||
1643 | path = btrfs_alloc_path(); | |
1644 | if (!path) | |
1645 | return -ENOMEM; | |
1646 | ||
1647 | path->reada = 1; | |
1648 | path->leave_spinning = 1; | |
1649 | /* this will setup the path even if it fails to insert the back ref */ | |
1650 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1651 | path, bytenr, num_bytes, parent, | |
1652 | root_objectid, owner, offset, | |
1653 | refs_to_add, extent_op); | |
1654 | if (ret == 0) | |
1655 | goto out; | |
1656 | ||
1657 | if (ret != -EAGAIN) { | |
1658 | err = ret; | |
1659 | goto out; | |
1660 | } | |
1661 | ||
1662 | leaf = path->nodes[0]; | |
1663 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1664 | refs = btrfs_extent_refs(leaf, item); | |
1665 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1666 | if (extent_op) | |
1667 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1668 | |
5d4f98a2 | 1669 | btrfs_mark_buffer_dirty(leaf); |
56bec294 CM |
1670 | btrfs_release_path(root->fs_info->extent_root, path); |
1671 | ||
1672 | path->reada = 1; | |
b9473439 CM |
1673 | path->leave_spinning = 1; |
1674 | ||
56bec294 CM |
1675 | /* now insert the actual backref */ |
1676 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1677 | path, bytenr, parent, root_objectid, |
1678 | owner, offset, refs_to_add); | |
56bec294 | 1679 | BUG_ON(ret); |
5d4f98a2 | 1680 | out: |
56bec294 | 1681 | btrfs_free_path(path); |
5d4f98a2 | 1682 | return err; |
56bec294 CM |
1683 | } |
1684 | ||
5d4f98a2 YZ |
1685 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1686 | struct btrfs_root *root, | |
1687 | struct btrfs_delayed_ref_node *node, | |
1688 | struct btrfs_delayed_extent_op *extent_op, | |
1689 | int insert_reserved) | |
56bec294 | 1690 | { |
5d4f98a2 YZ |
1691 | int ret = 0; |
1692 | struct btrfs_delayed_data_ref *ref; | |
1693 | struct btrfs_key ins; | |
1694 | u64 parent = 0; | |
1695 | u64 ref_root = 0; | |
1696 | u64 flags = 0; | |
1697 | ||
1698 | ins.objectid = node->bytenr; | |
1699 | ins.offset = node->num_bytes; | |
1700 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1701 | ||
1702 | ref = btrfs_delayed_node_to_data_ref(node); | |
1703 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1704 | parent = ref->parent; | |
1705 | else | |
1706 | ref_root = ref->root; | |
1707 | ||
1708 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1709 | if (extent_op) { | |
1710 | BUG_ON(extent_op->update_key); | |
1711 | flags |= extent_op->flags_to_set; | |
1712 | } | |
1713 | ret = alloc_reserved_file_extent(trans, root, | |
1714 | parent, ref_root, flags, | |
1715 | ref->objectid, ref->offset, | |
1716 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1717 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1718 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1719 | node->num_bytes, parent, | |
1720 | ref_root, ref->objectid, | |
1721 | ref->offset, node->ref_mod, | |
1722 | extent_op); | |
1723 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1724 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1725 | node->num_bytes, parent, | |
1726 | ref_root, ref->objectid, | |
1727 | ref->offset, node->ref_mod, | |
1728 | extent_op); | |
1729 | } else { | |
1730 | BUG(); | |
1731 | } | |
1732 | return ret; | |
1733 | } | |
1734 | ||
1735 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
1736 | struct extent_buffer *leaf, | |
1737 | struct btrfs_extent_item *ei) | |
1738 | { | |
1739 | u64 flags = btrfs_extent_flags(leaf, ei); | |
1740 | if (extent_op->update_flags) { | |
1741 | flags |= extent_op->flags_to_set; | |
1742 | btrfs_set_extent_flags(leaf, ei, flags); | |
1743 | } | |
1744 | ||
1745 | if (extent_op->update_key) { | |
1746 | struct btrfs_tree_block_info *bi; | |
1747 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
1748 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
1749 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
1750 | } | |
1751 | } | |
1752 | ||
1753 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
1754 | struct btrfs_root *root, | |
1755 | struct btrfs_delayed_ref_node *node, | |
1756 | struct btrfs_delayed_extent_op *extent_op) | |
1757 | { | |
1758 | struct btrfs_key key; | |
1759 | struct btrfs_path *path; | |
1760 | struct btrfs_extent_item *ei; | |
1761 | struct extent_buffer *leaf; | |
1762 | u32 item_size; | |
56bec294 | 1763 | int ret; |
5d4f98a2 YZ |
1764 | int err = 0; |
1765 | ||
1766 | path = btrfs_alloc_path(); | |
1767 | if (!path) | |
1768 | return -ENOMEM; | |
1769 | ||
1770 | key.objectid = node->bytenr; | |
1771 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1772 | key.offset = node->num_bytes; | |
1773 | ||
1774 | path->reada = 1; | |
1775 | path->leave_spinning = 1; | |
1776 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
1777 | path, 0, 1); | |
1778 | if (ret < 0) { | |
1779 | err = ret; | |
1780 | goto out; | |
1781 | } | |
1782 | if (ret > 0) { | |
1783 | err = -EIO; | |
1784 | goto out; | |
1785 | } | |
1786 | ||
1787 | leaf = path->nodes[0]; | |
1788 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1789 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1790 | if (item_size < sizeof(*ei)) { | |
1791 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
1792 | path, (u64)-1, 0); | |
1793 | if (ret < 0) { | |
1794 | err = ret; | |
1795 | goto out; | |
1796 | } | |
1797 | leaf = path->nodes[0]; | |
1798 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1799 | } | |
1800 | #endif | |
1801 | BUG_ON(item_size < sizeof(*ei)); | |
1802 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1803 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 1804 | |
5d4f98a2 YZ |
1805 | btrfs_mark_buffer_dirty(leaf); |
1806 | out: | |
1807 | btrfs_free_path(path); | |
1808 | return err; | |
56bec294 CM |
1809 | } |
1810 | ||
5d4f98a2 YZ |
1811 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
1812 | struct btrfs_root *root, | |
1813 | struct btrfs_delayed_ref_node *node, | |
1814 | struct btrfs_delayed_extent_op *extent_op, | |
1815 | int insert_reserved) | |
56bec294 CM |
1816 | { |
1817 | int ret = 0; | |
5d4f98a2 YZ |
1818 | struct btrfs_delayed_tree_ref *ref; |
1819 | struct btrfs_key ins; | |
1820 | u64 parent = 0; | |
1821 | u64 ref_root = 0; | |
56bec294 | 1822 | |
5d4f98a2 YZ |
1823 | ins.objectid = node->bytenr; |
1824 | ins.offset = node->num_bytes; | |
1825 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 1826 | |
5d4f98a2 YZ |
1827 | ref = btrfs_delayed_node_to_tree_ref(node); |
1828 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
1829 | parent = ref->parent; | |
1830 | else | |
1831 | ref_root = ref->root; | |
1832 | ||
1833 | BUG_ON(node->ref_mod != 1); | |
1834 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1835 | BUG_ON(!extent_op || !extent_op->update_flags || | |
1836 | !extent_op->update_key); | |
1837 | ret = alloc_reserved_tree_block(trans, root, | |
1838 | parent, ref_root, | |
1839 | extent_op->flags_to_set, | |
1840 | &extent_op->key, | |
1841 | ref->level, &ins); | |
5d4f98a2 YZ |
1842 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1843 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1844 | node->num_bytes, parent, ref_root, | |
1845 | ref->level, 0, 1, extent_op); | |
1846 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1847 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1848 | node->num_bytes, parent, ref_root, | |
1849 | ref->level, 0, 1, extent_op); | |
1850 | } else { | |
1851 | BUG(); | |
1852 | } | |
56bec294 CM |
1853 | return ret; |
1854 | } | |
1855 | ||
5d4f98a2 | 1856 | |
56bec294 | 1857 | /* helper function to actually process a single delayed ref entry */ |
5d4f98a2 YZ |
1858 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
1859 | struct btrfs_root *root, | |
1860 | struct btrfs_delayed_ref_node *node, | |
1861 | struct btrfs_delayed_extent_op *extent_op, | |
1862 | int insert_reserved) | |
56bec294 CM |
1863 | { |
1864 | int ret; | |
5d4f98a2 | 1865 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
1866 | struct btrfs_delayed_ref_head *head; |
1867 | /* | |
1868 | * we've hit the end of the chain and we were supposed | |
1869 | * to insert this extent into the tree. But, it got | |
1870 | * deleted before we ever needed to insert it, so all | |
1871 | * we have to do is clean up the accounting | |
1872 | */ | |
5d4f98a2 YZ |
1873 | BUG_ON(extent_op); |
1874 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 1875 | if (insert_reserved) { |
11833d66 YZ |
1876 | int mark_free = 0; |
1877 | struct extent_buffer *must_clean = NULL; | |
1878 | ||
1879 | ret = pin_down_bytes(trans, root, NULL, | |
1880 | node->bytenr, node->num_bytes, | |
1881 | head->is_data, 1, &must_clean); | |
1882 | if (ret > 0) | |
1883 | mark_free = 1; | |
1884 | ||
1885 | if (must_clean) { | |
1886 | clean_tree_block(NULL, root, must_clean); | |
1887 | btrfs_tree_unlock(must_clean); | |
1888 | free_extent_buffer(must_clean); | |
1889 | } | |
5d4f98a2 YZ |
1890 | if (head->is_data) { |
1891 | ret = btrfs_del_csums(trans, root, | |
1892 | node->bytenr, | |
1893 | node->num_bytes); | |
1894 | BUG_ON(ret); | |
1895 | } | |
11833d66 YZ |
1896 | if (mark_free) { |
1897 | ret = btrfs_free_reserved_extent(root, | |
1898 | node->bytenr, | |
1899 | node->num_bytes); | |
1900 | BUG_ON(ret); | |
1901 | } | |
56bec294 | 1902 | } |
56bec294 CM |
1903 | mutex_unlock(&head->mutex); |
1904 | return 0; | |
1905 | } | |
1906 | ||
5d4f98a2 YZ |
1907 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
1908 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
1909 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
1910 | insert_reserved); | |
1911 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
1912 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1913 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
1914 | insert_reserved); | |
1915 | else | |
1916 | BUG(); | |
1917 | return ret; | |
56bec294 CM |
1918 | } |
1919 | ||
1920 | static noinline struct btrfs_delayed_ref_node * | |
1921 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
1922 | { | |
1923 | struct rb_node *node; | |
1924 | struct btrfs_delayed_ref_node *ref; | |
1925 | int action = BTRFS_ADD_DELAYED_REF; | |
1926 | again: | |
1927 | /* | |
1928 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
1929 | * this prevents ref count from going down to zero when | |
1930 | * there still are pending delayed ref. | |
1931 | */ | |
1932 | node = rb_prev(&head->node.rb_node); | |
1933 | while (1) { | |
1934 | if (!node) | |
1935 | break; | |
1936 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
1937 | rb_node); | |
1938 | if (ref->bytenr != head->node.bytenr) | |
1939 | break; | |
5d4f98a2 | 1940 | if (ref->action == action) |
56bec294 CM |
1941 | return ref; |
1942 | node = rb_prev(node); | |
1943 | } | |
1944 | if (action == BTRFS_ADD_DELAYED_REF) { | |
1945 | action = BTRFS_DROP_DELAYED_REF; | |
1946 | goto again; | |
1947 | } | |
1948 | return NULL; | |
1949 | } | |
1950 | ||
c3e69d58 CM |
1951 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
1952 | struct btrfs_root *root, | |
1953 | struct list_head *cluster) | |
56bec294 | 1954 | { |
56bec294 CM |
1955 | struct btrfs_delayed_ref_root *delayed_refs; |
1956 | struct btrfs_delayed_ref_node *ref; | |
1957 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 1958 | struct btrfs_delayed_extent_op *extent_op; |
56bec294 | 1959 | int ret; |
c3e69d58 | 1960 | int count = 0; |
56bec294 | 1961 | int must_insert_reserved = 0; |
56bec294 CM |
1962 | |
1963 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
1964 | while (1) { |
1965 | if (!locked_ref) { | |
c3e69d58 CM |
1966 | /* pick a new head ref from the cluster list */ |
1967 | if (list_empty(cluster)) | |
56bec294 | 1968 | break; |
56bec294 | 1969 | |
c3e69d58 CM |
1970 | locked_ref = list_entry(cluster->next, |
1971 | struct btrfs_delayed_ref_head, cluster); | |
1972 | ||
1973 | /* grab the lock that says we are going to process | |
1974 | * all the refs for this head */ | |
1975 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
1976 | ||
1977 | /* | |
1978 | * we may have dropped the spin lock to get the head | |
1979 | * mutex lock, and that might have given someone else | |
1980 | * time to free the head. If that's true, it has been | |
1981 | * removed from our list and we can move on. | |
1982 | */ | |
1983 | if (ret == -EAGAIN) { | |
1984 | locked_ref = NULL; | |
1985 | count++; | |
1986 | continue; | |
56bec294 CM |
1987 | } |
1988 | } | |
a28ec197 | 1989 | |
56bec294 CM |
1990 | /* |
1991 | * record the must insert reserved flag before we | |
1992 | * drop the spin lock. | |
1993 | */ | |
1994 | must_insert_reserved = locked_ref->must_insert_reserved; | |
1995 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 1996 | |
5d4f98a2 YZ |
1997 | extent_op = locked_ref->extent_op; |
1998 | locked_ref->extent_op = NULL; | |
1999 | ||
56bec294 CM |
2000 | /* |
2001 | * locked_ref is the head node, so we have to go one | |
2002 | * node back for any delayed ref updates | |
2003 | */ | |
56bec294 CM |
2004 | ref = select_delayed_ref(locked_ref); |
2005 | if (!ref) { | |
2006 | /* All delayed refs have been processed, Go ahead | |
2007 | * and send the head node to run_one_delayed_ref, | |
2008 | * so that any accounting fixes can happen | |
2009 | */ | |
2010 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2011 | |
2012 | if (extent_op && must_insert_reserved) { | |
2013 | kfree(extent_op); | |
2014 | extent_op = NULL; | |
2015 | } | |
2016 | ||
2017 | if (extent_op) { | |
2018 | spin_unlock(&delayed_refs->lock); | |
2019 | ||
2020 | ret = run_delayed_extent_op(trans, root, | |
2021 | ref, extent_op); | |
2022 | BUG_ON(ret); | |
2023 | kfree(extent_op); | |
2024 | ||
2025 | cond_resched(); | |
2026 | spin_lock(&delayed_refs->lock); | |
2027 | continue; | |
2028 | } | |
2029 | ||
c3e69d58 | 2030 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
2031 | locked_ref = NULL; |
2032 | } | |
02217ed2 | 2033 | |
56bec294 CM |
2034 | ref->in_tree = 0; |
2035 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2036 | delayed_refs->num_entries--; | |
5d4f98a2 | 2037 | |
56bec294 | 2038 | spin_unlock(&delayed_refs->lock); |
925baedd | 2039 | |
5d4f98a2 | 2040 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 CM |
2041 | must_insert_reserved); |
2042 | BUG_ON(ret); | |
eb099670 | 2043 | |
5d4f98a2 YZ |
2044 | btrfs_put_delayed_ref(ref); |
2045 | kfree(extent_op); | |
c3e69d58 | 2046 | count++; |
5d4f98a2 | 2047 | |
c3e69d58 CM |
2048 | cond_resched(); |
2049 | spin_lock(&delayed_refs->lock); | |
2050 | } | |
2051 | return count; | |
2052 | } | |
2053 | ||
2054 | /* | |
2055 | * this starts processing the delayed reference count updates and | |
2056 | * extent insertions we have queued up so far. count can be | |
2057 | * 0, which means to process everything in the tree at the start | |
2058 | * of the run (but not newly added entries), or it can be some target | |
2059 | * number you'd like to process. | |
2060 | */ | |
2061 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2062 | struct btrfs_root *root, unsigned long count) | |
2063 | { | |
2064 | struct rb_node *node; | |
2065 | struct btrfs_delayed_ref_root *delayed_refs; | |
2066 | struct btrfs_delayed_ref_node *ref; | |
2067 | struct list_head cluster; | |
2068 | int ret; | |
2069 | int run_all = count == (unsigned long)-1; | |
2070 | int run_most = 0; | |
2071 | ||
2072 | if (root == root->fs_info->extent_root) | |
2073 | root = root->fs_info->tree_root; | |
2074 | ||
2075 | delayed_refs = &trans->transaction->delayed_refs; | |
2076 | INIT_LIST_HEAD(&cluster); | |
2077 | again: | |
2078 | spin_lock(&delayed_refs->lock); | |
2079 | if (count == 0) { | |
2080 | count = delayed_refs->num_entries * 2; | |
2081 | run_most = 1; | |
2082 | } | |
2083 | while (1) { | |
2084 | if (!(run_all || run_most) && | |
2085 | delayed_refs->num_heads_ready < 64) | |
2086 | break; | |
eb099670 | 2087 | |
56bec294 | 2088 | /* |
c3e69d58 CM |
2089 | * go find something we can process in the rbtree. We start at |
2090 | * the beginning of the tree, and then build a cluster | |
2091 | * of refs to process starting at the first one we are able to | |
2092 | * lock | |
56bec294 | 2093 | */ |
c3e69d58 CM |
2094 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2095 | delayed_refs->run_delayed_start); | |
2096 | if (ret) | |
56bec294 CM |
2097 | break; |
2098 | ||
c3e69d58 CM |
2099 | ret = run_clustered_refs(trans, root, &cluster); |
2100 | BUG_ON(ret < 0); | |
2101 | ||
2102 | count -= min_t(unsigned long, ret, count); | |
2103 | ||
2104 | if (count == 0) | |
2105 | break; | |
eb099670 | 2106 | } |
c3e69d58 | 2107 | |
56bec294 | 2108 | if (run_all) { |
56bec294 | 2109 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2110 | if (!node) |
56bec294 | 2111 | goto out; |
c3e69d58 | 2112 | count = (unsigned long)-1; |
e9d0b13b | 2113 | |
56bec294 CM |
2114 | while (node) { |
2115 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2116 | rb_node); | |
2117 | if (btrfs_delayed_ref_is_head(ref)) { | |
2118 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2119 | |
56bec294 CM |
2120 | head = btrfs_delayed_node_to_head(ref); |
2121 | atomic_inc(&ref->refs); | |
2122 | ||
2123 | spin_unlock(&delayed_refs->lock); | |
2124 | mutex_lock(&head->mutex); | |
2125 | mutex_unlock(&head->mutex); | |
2126 | ||
2127 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2128 | cond_resched(); |
56bec294 CM |
2129 | goto again; |
2130 | } | |
2131 | node = rb_next(node); | |
2132 | } | |
2133 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2134 | schedule_timeout(1); |
2135 | goto again; | |
5f39d397 | 2136 | } |
54aa1f4d | 2137 | out: |
c3e69d58 | 2138 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
2139 | return 0; |
2140 | } | |
2141 | ||
5d4f98a2 YZ |
2142 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2143 | struct btrfs_root *root, | |
2144 | u64 bytenr, u64 num_bytes, u64 flags, | |
2145 | int is_data) | |
2146 | { | |
2147 | struct btrfs_delayed_extent_op *extent_op; | |
2148 | int ret; | |
2149 | ||
2150 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2151 | if (!extent_op) | |
2152 | return -ENOMEM; | |
2153 | ||
2154 | extent_op->flags_to_set = flags; | |
2155 | extent_op->update_flags = 1; | |
2156 | extent_op->update_key = 0; | |
2157 | extent_op->is_data = is_data ? 1 : 0; | |
2158 | ||
2159 | ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); | |
2160 | if (ret) | |
2161 | kfree(extent_op); | |
2162 | return ret; | |
2163 | } | |
2164 | ||
2165 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2166 | struct btrfs_root *root, | |
2167 | struct btrfs_path *path, | |
2168 | u64 objectid, u64 offset, u64 bytenr) | |
2169 | { | |
2170 | struct btrfs_delayed_ref_head *head; | |
2171 | struct btrfs_delayed_ref_node *ref; | |
2172 | struct btrfs_delayed_data_ref *data_ref; | |
2173 | struct btrfs_delayed_ref_root *delayed_refs; | |
2174 | struct rb_node *node; | |
2175 | int ret = 0; | |
2176 | ||
2177 | ret = -ENOENT; | |
2178 | delayed_refs = &trans->transaction->delayed_refs; | |
2179 | spin_lock(&delayed_refs->lock); | |
2180 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2181 | if (!head) | |
2182 | goto out; | |
2183 | ||
2184 | if (!mutex_trylock(&head->mutex)) { | |
2185 | atomic_inc(&head->node.refs); | |
2186 | spin_unlock(&delayed_refs->lock); | |
2187 | ||
2188 | btrfs_release_path(root->fs_info->extent_root, path); | |
2189 | ||
2190 | mutex_lock(&head->mutex); | |
2191 | mutex_unlock(&head->mutex); | |
2192 | btrfs_put_delayed_ref(&head->node); | |
2193 | return -EAGAIN; | |
2194 | } | |
2195 | ||
2196 | node = rb_prev(&head->node.rb_node); | |
2197 | if (!node) | |
2198 | goto out_unlock; | |
2199 | ||
2200 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2201 | ||
2202 | if (ref->bytenr != bytenr) | |
2203 | goto out_unlock; | |
2204 | ||
2205 | ret = 1; | |
2206 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2207 | goto out_unlock; | |
2208 | ||
2209 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2210 | ||
2211 | node = rb_prev(node); | |
2212 | if (node) { | |
2213 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2214 | if (ref->bytenr == bytenr) | |
2215 | goto out_unlock; | |
2216 | } | |
2217 | ||
2218 | if (data_ref->root != root->root_key.objectid || | |
2219 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2220 | goto out_unlock; | |
2221 | ||
2222 | ret = 0; | |
2223 | out_unlock: | |
2224 | mutex_unlock(&head->mutex); | |
2225 | out: | |
2226 | spin_unlock(&delayed_refs->lock); | |
2227 | return ret; | |
2228 | } | |
2229 | ||
2230 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2231 | struct btrfs_root *root, | |
2232 | struct btrfs_path *path, | |
2233 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2234 | { |
2235 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2236 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2237 | struct btrfs_extent_data_ref *ref; |
2238 | struct btrfs_extent_inline_ref *iref; | |
2239 | struct btrfs_extent_item *ei; | |
f321e491 | 2240 | struct btrfs_key key; |
5d4f98a2 | 2241 | u32 item_size; |
be20aa9d | 2242 | int ret; |
925baedd | 2243 | |
be20aa9d | 2244 | key.objectid = bytenr; |
31840ae1 | 2245 | key.offset = (u64)-1; |
f321e491 | 2246 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2247 | |
be20aa9d CM |
2248 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2249 | if (ret < 0) | |
2250 | goto out; | |
2251 | BUG_ON(ret == 0); | |
80ff3856 YZ |
2252 | |
2253 | ret = -ENOENT; | |
2254 | if (path->slots[0] == 0) | |
31840ae1 | 2255 | goto out; |
be20aa9d | 2256 | |
31840ae1 | 2257 | path->slots[0]--; |
f321e491 | 2258 | leaf = path->nodes[0]; |
5d4f98a2 | 2259 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2260 | |
5d4f98a2 | 2261 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2262 | goto out; |
f321e491 | 2263 | |
5d4f98a2 YZ |
2264 | ret = 1; |
2265 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2266 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2267 | if (item_size < sizeof(*ei)) { | |
2268 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2269 | goto out; | |
2270 | } | |
2271 | #endif | |
2272 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2273 | |
5d4f98a2 YZ |
2274 | if (item_size != sizeof(*ei) + |
2275 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2276 | goto out; | |
be20aa9d | 2277 | |
5d4f98a2 YZ |
2278 | if (btrfs_extent_generation(leaf, ei) <= |
2279 | btrfs_root_last_snapshot(&root->root_item)) | |
2280 | goto out; | |
2281 | ||
2282 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2283 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2284 | BTRFS_EXTENT_DATA_REF_KEY) | |
2285 | goto out; | |
2286 | ||
2287 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2288 | if (btrfs_extent_refs(leaf, ei) != | |
2289 | btrfs_extent_data_ref_count(leaf, ref) || | |
2290 | btrfs_extent_data_ref_root(leaf, ref) != | |
2291 | root->root_key.objectid || | |
2292 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2293 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2294 | goto out; | |
2295 | ||
2296 | ret = 0; | |
2297 | out: | |
2298 | return ret; | |
2299 | } | |
2300 | ||
2301 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2302 | struct btrfs_root *root, | |
2303 | u64 objectid, u64 offset, u64 bytenr) | |
2304 | { | |
2305 | struct btrfs_path *path; | |
2306 | int ret; | |
2307 | int ret2; | |
2308 | ||
2309 | path = btrfs_alloc_path(); | |
2310 | if (!path) | |
2311 | return -ENOENT; | |
2312 | ||
2313 | do { | |
2314 | ret = check_committed_ref(trans, root, path, objectid, | |
2315 | offset, bytenr); | |
2316 | if (ret && ret != -ENOENT) | |
f321e491 | 2317 | goto out; |
80ff3856 | 2318 | |
5d4f98a2 YZ |
2319 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2320 | offset, bytenr); | |
2321 | } while (ret2 == -EAGAIN); | |
2322 | ||
2323 | if (ret2 && ret2 != -ENOENT) { | |
2324 | ret = ret2; | |
2325 | goto out; | |
f321e491 | 2326 | } |
5d4f98a2 YZ |
2327 | |
2328 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2329 | ret = 0; | |
be20aa9d | 2330 | out: |
80ff3856 | 2331 | btrfs_free_path(path); |
f321e491 | 2332 | return ret; |
be20aa9d | 2333 | } |
c5739bba | 2334 | |
5d4f98a2 | 2335 | #if 0 |
31840ae1 ZY |
2336 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
2337 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 2338 | { |
5f39d397 | 2339 | struct btrfs_key key; |
6407bf6d | 2340 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
2341 | u64 root_gen; |
2342 | u32 nritems; | |
02217ed2 | 2343 | int i; |
db94535d | 2344 | int level; |
31840ae1 | 2345 | int ret = 0; |
e4657689 | 2346 | int shared = 0; |
a28ec197 | 2347 | |
3768f368 | 2348 | if (!root->ref_cows) |
a28ec197 | 2349 | return 0; |
5f39d397 | 2350 | |
e4657689 ZY |
2351 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
2352 | shared = 0; | |
2353 | root_gen = root->root_key.offset; | |
2354 | } else { | |
2355 | shared = 1; | |
2356 | root_gen = trans->transid - 1; | |
2357 | } | |
2358 | ||
db94535d | 2359 | level = btrfs_header_level(buf); |
5f39d397 | 2360 | nritems = btrfs_header_nritems(buf); |
4a096752 | 2361 | |
31840ae1 | 2362 | if (level == 0) { |
31153d81 YZ |
2363 | struct btrfs_leaf_ref *ref; |
2364 | struct btrfs_extent_info *info; | |
2365 | ||
31840ae1 | 2366 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 2367 | if (!ref) { |
31840ae1 | 2368 | ret = -ENOMEM; |
31153d81 YZ |
2369 | goto out; |
2370 | } | |
2371 | ||
e4657689 | 2372 | ref->root_gen = root_gen; |
31153d81 YZ |
2373 | ref->bytenr = buf->start; |
2374 | ref->owner = btrfs_header_owner(buf); | |
2375 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 2376 | ref->nritems = nr_extents; |
31153d81 | 2377 | info = ref->extents; |
bcc63abb | 2378 | |
31840ae1 | 2379 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
2380 | u64 disk_bytenr; |
2381 | btrfs_item_key_to_cpu(buf, &key, i); | |
2382 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
2383 | continue; | |
2384 | fi = btrfs_item_ptr(buf, i, | |
2385 | struct btrfs_file_extent_item); | |
2386 | if (btrfs_file_extent_type(buf, fi) == | |
2387 | BTRFS_FILE_EXTENT_INLINE) | |
2388 | continue; | |
2389 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2390 | if (disk_bytenr == 0) | |
2391 | continue; | |
2392 | ||
2393 | info->bytenr = disk_bytenr; | |
2394 | info->num_bytes = | |
2395 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
2396 | info->objectid = key.objectid; | |
2397 | info->offset = key.offset; | |
2398 | info++; | |
2399 | } | |
2400 | ||
e4657689 | 2401 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
2402 | if (ret == -EEXIST && shared) { |
2403 | struct btrfs_leaf_ref *old; | |
2404 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
2405 | BUG_ON(!old); | |
2406 | btrfs_remove_leaf_ref(root, old); | |
2407 | btrfs_free_leaf_ref(root, old); | |
2408 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
2409 | } | |
31153d81 | 2410 | WARN_ON(ret); |
bcc63abb | 2411 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
2412 | } |
2413 | out: | |
31840ae1 ZY |
2414 | return ret; |
2415 | } | |
2416 | ||
b7a9f29f CM |
2417 | /* when a block goes through cow, we update the reference counts of |
2418 | * everything that block points to. The internal pointers of the block | |
2419 | * can be in just about any order, and it is likely to have clusters of | |
2420 | * things that are close together and clusters of things that are not. | |
2421 | * | |
2422 | * To help reduce the seeks that come with updating all of these reference | |
2423 | * counts, sort them by byte number before actual updates are done. | |
2424 | * | |
2425 | * struct refsort is used to match byte number to slot in the btree block. | |
2426 | * we sort based on the byte number and then use the slot to actually | |
2427 | * find the item. | |
bd56b302 CM |
2428 | * |
2429 | * struct refsort is smaller than strcut btrfs_item and smaller than | |
2430 | * struct btrfs_key_ptr. Since we're currently limited to the page size | |
2431 | * for a btree block, there's no way for a kmalloc of refsorts for a | |
2432 | * single node to be bigger than a page. | |
b7a9f29f CM |
2433 | */ |
2434 | struct refsort { | |
2435 | u64 bytenr; | |
2436 | u32 slot; | |
2437 | }; | |
2438 | ||
2439 | /* | |
2440 | * for passing into sort() | |
2441 | */ | |
2442 | static int refsort_cmp(const void *a_void, const void *b_void) | |
2443 | { | |
2444 | const struct refsort *a = a_void; | |
2445 | const struct refsort *b = b_void; | |
2446 | ||
2447 | if (a->bytenr < b->bytenr) | |
2448 | return -1; | |
2449 | if (a->bytenr > b->bytenr) | |
2450 | return 1; | |
2451 | return 0; | |
2452 | } | |
5d4f98a2 | 2453 | #endif |
b7a9f29f | 2454 | |
5d4f98a2 | 2455 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2456 | struct btrfs_root *root, |
5d4f98a2 YZ |
2457 | struct extent_buffer *buf, |
2458 | int full_backref, int inc) | |
31840ae1 ZY |
2459 | { |
2460 | u64 bytenr; | |
5d4f98a2 YZ |
2461 | u64 num_bytes; |
2462 | u64 parent; | |
31840ae1 | 2463 | u64 ref_root; |
31840ae1 | 2464 | u32 nritems; |
31840ae1 ZY |
2465 | struct btrfs_key key; |
2466 | struct btrfs_file_extent_item *fi; | |
2467 | int i; | |
2468 | int level; | |
2469 | int ret = 0; | |
31840ae1 | 2470 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
5d4f98a2 | 2471 | u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
2472 | |
2473 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2474 | nritems = btrfs_header_nritems(buf); |
2475 | level = btrfs_header_level(buf); | |
2476 | ||
5d4f98a2 YZ |
2477 | if (!root->ref_cows && level == 0) |
2478 | return 0; | |
31840ae1 | 2479 | |
5d4f98a2 YZ |
2480 | if (inc) |
2481 | process_func = btrfs_inc_extent_ref; | |
2482 | else | |
2483 | process_func = btrfs_free_extent; | |
31840ae1 | 2484 | |
5d4f98a2 YZ |
2485 | if (full_backref) |
2486 | parent = buf->start; | |
2487 | else | |
2488 | parent = 0; | |
2489 | ||
2490 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2491 | if (level == 0) { |
5d4f98a2 | 2492 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2493 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2494 | continue; | |
5d4f98a2 | 2495 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2496 | struct btrfs_file_extent_item); |
2497 | if (btrfs_file_extent_type(buf, fi) == | |
2498 | BTRFS_FILE_EXTENT_INLINE) | |
2499 | continue; | |
2500 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2501 | if (bytenr == 0) | |
2502 | continue; | |
5d4f98a2 YZ |
2503 | |
2504 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2505 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2506 | ret = process_func(trans, root, bytenr, num_bytes, | |
2507 | parent, ref_root, key.objectid, | |
2508 | key.offset); | |
31840ae1 ZY |
2509 | if (ret) |
2510 | goto fail; | |
2511 | } else { | |
5d4f98a2 YZ |
2512 | bytenr = btrfs_node_blockptr(buf, i); |
2513 | num_bytes = btrfs_level_size(root, level - 1); | |
2514 | ret = process_func(trans, root, bytenr, num_bytes, | |
2515 | parent, ref_root, level - 1, 0); | |
31840ae1 ZY |
2516 | if (ret) |
2517 | goto fail; | |
2518 | } | |
2519 | } | |
2520 | return 0; | |
2521 | fail: | |
5d4f98a2 YZ |
2522 | BUG(); |
2523 | return ret; | |
2524 | } | |
2525 | ||
2526 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2527 | struct extent_buffer *buf, int full_backref) | |
2528 | { | |
2529 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
2530 | } | |
2531 | ||
2532 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2533 | struct extent_buffer *buf, int full_backref) | |
2534 | { | |
2535 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
31840ae1 ZY |
2536 | } |
2537 | ||
9078a3e1 CM |
2538 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2539 | struct btrfs_root *root, | |
2540 | struct btrfs_path *path, | |
2541 | struct btrfs_block_group_cache *cache) | |
2542 | { | |
2543 | int ret; | |
9078a3e1 | 2544 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2545 | unsigned long bi; |
2546 | struct extent_buffer *leaf; | |
9078a3e1 | 2547 | |
9078a3e1 | 2548 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2549 | if (ret < 0) |
2550 | goto fail; | |
9078a3e1 | 2551 | BUG_ON(ret); |
5f39d397 CM |
2552 | |
2553 | leaf = path->nodes[0]; | |
2554 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2555 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2556 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 2557 | btrfs_release_path(extent_root, path); |
54aa1f4d | 2558 | fail: |
9078a3e1 CM |
2559 | if (ret) |
2560 | return ret; | |
9078a3e1 CM |
2561 | return 0; |
2562 | ||
2563 | } | |
2564 | ||
4a8c9a62 YZ |
2565 | static struct btrfs_block_group_cache * |
2566 | next_block_group(struct btrfs_root *root, | |
2567 | struct btrfs_block_group_cache *cache) | |
2568 | { | |
2569 | struct rb_node *node; | |
2570 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2571 | node = rb_next(&cache->cache_node); | |
2572 | btrfs_put_block_group(cache); | |
2573 | if (node) { | |
2574 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2575 | cache_node); | |
2576 | atomic_inc(&cache->count); | |
2577 | } else | |
2578 | cache = NULL; | |
2579 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2580 | return cache; | |
2581 | } | |
2582 | ||
96b5179d CM |
2583 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
2584 | struct btrfs_root *root) | |
9078a3e1 | 2585 | { |
4a8c9a62 | 2586 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 2587 | int err = 0; |
9078a3e1 | 2588 | struct btrfs_path *path; |
96b5179d | 2589 | u64 last = 0; |
9078a3e1 CM |
2590 | |
2591 | path = btrfs_alloc_path(); | |
2592 | if (!path) | |
2593 | return -ENOMEM; | |
2594 | ||
d397712b | 2595 | while (1) { |
4a8c9a62 YZ |
2596 | if (last == 0) { |
2597 | err = btrfs_run_delayed_refs(trans, root, | |
2598 | (unsigned long)-1); | |
2599 | BUG_ON(err); | |
0f9dd46c | 2600 | } |
54aa1f4d | 2601 | |
4a8c9a62 YZ |
2602 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
2603 | while (cache) { | |
2604 | if (cache->dirty) | |
2605 | break; | |
2606 | cache = next_block_group(root, cache); | |
2607 | } | |
2608 | if (!cache) { | |
2609 | if (last == 0) | |
2610 | break; | |
2611 | last = 0; | |
2612 | continue; | |
2613 | } | |
0f9dd46c | 2614 | |
e8569813 | 2615 | cache->dirty = 0; |
4a8c9a62 | 2616 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 2617 | |
4a8c9a62 YZ |
2618 | err = write_one_cache_group(trans, root, path, cache); |
2619 | BUG_ON(err); | |
2620 | btrfs_put_block_group(cache); | |
9078a3e1 | 2621 | } |
4a8c9a62 | 2622 | |
9078a3e1 | 2623 | btrfs_free_path(path); |
4a8c9a62 | 2624 | return 0; |
9078a3e1 CM |
2625 | } |
2626 | ||
d2fb3437 YZ |
2627 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
2628 | { | |
2629 | struct btrfs_block_group_cache *block_group; | |
2630 | int readonly = 0; | |
2631 | ||
2632 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
2633 | if (!block_group || block_group->ro) | |
2634 | readonly = 1; | |
2635 | if (block_group) | |
fa9c0d79 | 2636 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
2637 | return readonly; |
2638 | } | |
2639 | ||
593060d7 CM |
2640 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
2641 | u64 total_bytes, u64 bytes_used, | |
2642 | struct btrfs_space_info **space_info) | |
2643 | { | |
2644 | struct btrfs_space_info *found; | |
2645 | ||
2646 | found = __find_space_info(info, flags); | |
2647 | if (found) { | |
25179201 | 2648 | spin_lock(&found->lock); |
593060d7 CM |
2649 | found->total_bytes += total_bytes; |
2650 | found->bytes_used += bytes_used; | |
8f18cf13 | 2651 | found->full = 0; |
25179201 | 2652 | spin_unlock(&found->lock); |
593060d7 CM |
2653 | *space_info = found; |
2654 | return 0; | |
2655 | } | |
c146afad | 2656 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
2657 | if (!found) |
2658 | return -ENOMEM; | |
2659 | ||
0f9dd46c | 2660 | INIT_LIST_HEAD(&found->block_groups); |
80eb234a | 2661 | init_rwsem(&found->groups_sem); |
0f9dd46c | 2662 | spin_lock_init(&found->lock); |
593060d7 CM |
2663 | found->flags = flags; |
2664 | found->total_bytes = total_bytes; | |
2665 | found->bytes_used = bytes_used; | |
2666 | found->bytes_pinned = 0; | |
e8569813 | 2667 | found->bytes_reserved = 0; |
c146afad | 2668 | found->bytes_readonly = 0; |
6a63209f | 2669 | found->bytes_delalloc = 0; |
593060d7 | 2670 | found->full = 0; |
0ef3e66b | 2671 | found->force_alloc = 0; |
593060d7 | 2672 | *space_info = found; |
4184ea7f | 2673 | list_add_rcu(&found->list, &info->space_info); |
817d52f8 | 2674 | atomic_set(&found->caching_threads, 0); |
593060d7 CM |
2675 | return 0; |
2676 | } | |
2677 | ||
8790d502 CM |
2678 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
2679 | { | |
2680 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 2681 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 2682 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 2683 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
2684 | if (extra_flags) { |
2685 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
2686 | fs_info->avail_data_alloc_bits |= extra_flags; | |
2687 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
2688 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
2689 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
2690 | fs_info->avail_system_alloc_bits |= extra_flags; | |
2691 | } | |
2692 | } | |
593060d7 | 2693 | |
c146afad YZ |
2694 | static void set_block_group_readonly(struct btrfs_block_group_cache *cache) |
2695 | { | |
2696 | spin_lock(&cache->space_info->lock); | |
2697 | spin_lock(&cache->lock); | |
2698 | if (!cache->ro) { | |
2699 | cache->space_info->bytes_readonly += cache->key.offset - | |
2700 | btrfs_block_group_used(&cache->item); | |
2701 | cache->ro = 1; | |
2702 | } | |
2703 | spin_unlock(&cache->lock); | |
2704 | spin_unlock(&cache->space_info->lock); | |
2705 | } | |
2706 | ||
2b82032c | 2707 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 2708 | { |
2b82032c | 2709 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
a061fc8d CM |
2710 | |
2711 | if (num_devices == 1) | |
2712 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
2713 | if (num_devices < 4) | |
2714 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
2715 | ||
ec44a35c CM |
2716 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
2717 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 2718 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 2719 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 2720 | } |
ec44a35c CM |
2721 | |
2722 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 2723 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 2724 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 2725 | } |
ec44a35c CM |
2726 | |
2727 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
2728 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
2729 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
2730 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
2731 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
2732 | return flags; | |
2733 | } | |
2734 | ||
6a63209f JB |
2735 | static u64 btrfs_get_alloc_profile(struct btrfs_root *root, u64 data) |
2736 | { | |
2737 | struct btrfs_fs_info *info = root->fs_info; | |
2738 | u64 alloc_profile; | |
2739 | ||
2740 | if (data) { | |
2741 | alloc_profile = info->avail_data_alloc_bits & | |
2742 | info->data_alloc_profile; | |
2743 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
2744 | } else if (root == root->fs_info->chunk_root) { | |
2745 | alloc_profile = info->avail_system_alloc_bits & | |
2746 | info->system_alloc_profile; | |
2747 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
2748 | } else { | |
2749 | alloc_profile = info->avail_metadata_alloc_bits & | |
2750 | info->metadata_alloc_profile; | |
2751 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
2752 | } | |
2753 | ||
2754 | return btrfs_reduce_alloc_profile(root, data); | |
2755 | } | |
2756 | ||
2757 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) | |
2758 | { | |
2759 | u64 alloc_target; | |
2760 | ||
2761 | alloc_target = btrfs_get_alloc_profile(root, 1); | |
2762 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, | |
2763 | alloc_target); | |
2764 | } | |
2765 | ||
9ed74f2d JB |
2766 | static u64 calculate_bytes_needed(struct btrfs_root *root, int num_items) |
2767 | { | |
2768 | u64 num_bytes; | |
2769 | int level; | |
2770 | ||
2771 | level = BTRFS_MAX_LEVEL - 2; | |
2772 | /* | |
2773 | * NOTE: these calculations are absolutely the worst possible case. | |
2774 | * This assumes that _every_ item we insert will require a new leaf, and | |
2775 | * that the tree has grown to its maximum level size. | |
2776 | */ | |
2777 | ||
2778 | /* | |
2779 | * for every item we insert we could insert both an extent item and a | |
2780 | * extent ref item. Then for ever item we insert, we will need to cow | |
2781 | * both the original leaf, plus the leaf to the left and right of it. | |
2782 | * | |
2783 | * Unless we are talking about the extent root, then we just want the | |
2784 | * number of items * 2, since we just need the extent item plus its ref. | |
2785 | */ | |
2786 | if (root == root->fs_info->extent_root) | |
2787 | num_bytes = num_items * 2; | |
2788 | else | |
2789 | num_bytes = (num_items + (2 * num_items)) * 3; | |
2790 | ||
2791 | /* | |
2792 | * num_bytes is total number of leaves we could need times the leaf | |
2793 | * size, and then for every leaf we could end up cow'ing 2 nodes per | |
2794 | * level, down to the leaf level. | |
2795 | */ | |
2796 | num_bytes = (num_bytes * root->leafsize) + | |
2797 | (num_bytes * (level * 2)) * root->nodesize; | |
2798 | ||
2799 | return num_bytes; | |
2800 | } | |
2801 | ||
6a63209f | 2802 | /* |
9ed74f2d JB |
2803 | * Unreserve metadata space for delalloc. If we have less reserved credits than |
2804 | * we have extents, this function does nothing. | |
6a63209f | 2805 | */ |
9ed74f2d JB |
2806 | int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root, |
2807 | struct inode *inode, int num_items) | |
6a63209f JB |
2808 | { |
2809 | struct btrfs_fs_info *info = root->fs_info; | |
2810 | struct btrfs_space_info *meta_sinfo; | |
9ed74f2d JB |
2811 | u64 num_bytes; |
2812 | u64 alloc_target; | |
2813 | bool bug = false; | |
6a63209f JB |
2814 | |
2815 | /* get the space info for where the metadata will live */ | |
2816 | alloc_target = btrfs_get_alloc_profile(root, 0); | |
2817 | meta_sinfo = __find_space_info(info, alloc_target); | |
2818 | ||
9ed74f2d JB |
2819 | num_bytes = calculate_bytes_needed(root->fs_info->extent_root, |
2820 | num_items); | |
2821 | ||
6a63209f | 2822 | spin_lock(&meta_sinfo->lock); |
32c00aff JB |
2823 | spin_lock(&BTRFS_I(inode)->accounting_lock); |
2824 | if (BTRFS_I(inode)->reserved_extents <= | |
2825 | BTRFS_I(inode)->outstanding_extents) { | |
2826 | spin_unlock(&BTRFS_I(inode)->accounting_lock); | |
9ed74f2d JB |
2827 | spin_unlock(&meta_sinfo->lock); |
2828 | return 0; | |
2829 | } | |
32c00aff | 2830 | spin_unlock(&BTRFS_I(inode)->accounting_lock); |
9ed74f2d | 2831 | |
32c00aff JB |
2832 | BTRFS_I(inode)->reserved_extents--; |
2833 | BUG_ON(BTRFS_I(inode)->reserved_extents < 0); | |
9ed74f2d JB |
2834 | |
2835 | if (meta_sinfo->bytes_delalloc < num_bytes) { | |
2836 | bug = true; | |
2837 | meta_sinfo->bytes_delalloc = 0; | |
2838 | } else { | |
2839 | meta_sinfo->bytes_delalloc -= num_bytes; | |
2840 | } | |
2841 | spin_unlock(&meta_sinfo->lock); | |
2842 | ||
2843 | BUG_ON(bug); | |
2844 | ||
2845 | return 0; | |
2846 | } | |
6a63209f | 2847 | |
9ed74f2d JB |
2848 | static void check_force_delalloc(struct btrfs_space_info *meta_sinfo) |
2849 | { | |
2850 | u64 thresh; | |
2851 | ||
2852 | thresh = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + | |
2853 | meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly + | |
2854 | meta_sinfo->bytes_super + meta_sinfo->bytes_root + | |
2855 | meta_sinfo->bytes_may_use; | |
2856 | ||
2857 | thresh = meta_sinfo->total_bytes - thresh; | |
2858 | thresh *= 80; | |
6a63209f | 2859 | do_div(thresh, 100); |
9ed74f2d JB |
2860 | if (thresh <= meta_sinfo->bytes_delalloc) |
2861 | meta_sinfo->force_delalloc = 1; | |
2862 | else | |
2863 | meta_sinfo->force_delalloc = 0; | |
2864 | } | |
6a63209f | 2865 | |
e3ccfa98 JB |
2866 | struct async_flush { |
2867 | struct btrfs_root *root; | |
2868 | struct btrfs_space_info *info; | |
2869 | struct btrfs_work work; | |
2870 | }; | |
2871 | ||
2872 | static noinline void flush_delalloc_async(struct btrfs_work *work) | |
2873 | { | |
2874 | struct async_flush *async; | |
2875 | struct btrfs_root *root; | |
2876 | struct btrfs_space_info *info; | |
2877 | ||
2878 | async = container_of(work, struct async_flush, work); | |
2879 | root = async->root; | |
2880 | info = async->info; | |
2881 | ||
2882 | btrfs_start_delalloc_inodes(root); | |
2883 | wake_up(&info->flush_wait); | |
2884 | btrfs_wait_ordered_extents(root, 0); | |
2885 | ||
2886 | spin_lock(&info->lock); | |
2887 | info->flushing = 0; | |
2888 | spin_unlock(&info->lock); | |
2889 | wake_up(&info->flush_wait); | |
2890 | ||
2891 | kfree(async); | |
2892 | } | |
2893 | ||
2894 | static void wait_on_flush(struct btrfs_space_info *info) | |
2895 | { | |
2896 | DEFINE_WAIT(wait); | |
2897 | u64 used; | |
2898 | ||
2899 | while (1) { | |
2900 | prepare_to_wait(&info->flush_wait, &wait, | |
2901 | TASK_UNINTERRUPTIBLE); | |
2902 | spin_lock(&info->lock); | |
2903 | if (!info->flushing) { | |
2904 | spin_unlock(&info->lock); | |
2905 | break; | |
2906 | } | |
2907 | ||
2908 | used = info->bytes_used + info->bytes_reserved + | |
2909 | info->bytes_pinned + info->bytes_readonly + | |
2910 | info->bytes_super + info->bytes_root + | |
2911 | info->bytes_may_use + info->bytes_delalloc; | |
2912 | if (used < info->total_bytes) { | |
2913 | spin_unlock(&info->lock); | |
2914 | break; | |
2915 | } | |
2916 | spin_unlock(&info->lock); | |
2917 | schedule(); | |
2918 | } | |
2919 | finish_wait(&info->flush_wait, &wait); | |
2920 | } | |
2921 | ||
32c00aff JB |
2922 | static void flush_delalloc(struct btrfs_root *root, |
2923 | struct btrfs_space_info *info) | |
2924 | { | |
e3ccfa98 | 2925 | struct async_flush *async; |
32c00aff JB |
2926 | bool wait = false; |
2927 | ||
2928 | spin_lock(&info->lock); | |
2929 | ||
2930 | if (!info->flushing) { | |
2931 | info->flushing = 1; | |
2932 | init_waitqueue_head(&info->flush_wait); | |
2933 | } else { | |
2934 | wait = true; | |
2935 | } | |
2936 | ||
2937 | spin_unlock(&info->lock); | |
2938 | ||
2939 | if (wait) { | |
e3ccfa98 | 2940 | wait_on_flush(info); |
32c00aff JB |
2941 | return; |
2942 | } | |
2943 | ||
e3ccfa98 JB |
2944 | async = kzalloc(sizeof(*async), GFP_NOFS); |
2945 | if (!async) | |
2946 | goto flush; | |
2947 | ||
2948 | async->root = root; | |
2949 | async->info = info; | |
2950 | async->work.func = flush_delalloc_async; | |
2951 | ||
2952 | btrfs_queue_worker(&root->fs_info->enospc_workers, | |
2953 | &async->work); | |
2954 | wait_on_flush(info); | |
2955 | return; | |
2956 | ||
2957 | flush: | |
32c00aff JB |
2958 | btrfs_start_delalloc_inodes(root); |
2959 | btrfs_wait_ordered_extents(root, 0); | |
2960 | ||
2961 | spin_lock(&info->lock); | |
2962 | info->flushing = 0; | |
2963 | spin_unlock(&info->lock); | |
2964 | wake_up(&info->flush_wait); | |
2965 | } | |
2966 | ||
9ed74f2d JB |
2967 | static int maybe_allocate_chunk(struct btrfs_root *root, |
2968 | struct btrfs_space_info *info) | |
2969 | { | |
2970 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; | |
2971 | struct btrfs_trans_handle *trans; | |
2972 | bool wait = false; | |
2973 | int ret = 0; | |
2974 | u64 min_metadata; | |
2975 | u64 free_space; | |
2976 | ||
2977 | free_space = btrfs_super_total_bytes(disk_super); | |
2978 | /* | |
2979 | * we allow the metadata to grow to a max of either 5gb or 5% of the | |
2980 | * space in the volume. | |
2981 | */ | |
2982 | min_metadata = min((u64)5 * 1024 * 1024 * 1024, | |
2983 | div64_u64(free_space * 5, 100)); | |
2984 | if (info->total_bytes >= min_metadata) { | |
2985 | spin_unlock(&info->lock); | |
2986 | return 0; | |
2987 | } | |
2988 | ||
2989 | if (info->full) { | |
2990 | spin_unlock(&info->lock); | |
2991 | return 0; | |
2992 | } | |
2993 | ||
2994 | if (!info->allocating_chunk) { | |
2995 | info->force_alloc = 1; | |
2996 | info->allocating_chunk = 1; | |
e3ccfa98 | 2997 | init_waitqueue_head(&info->allocate_wait); |
9ed74f2d JB |
2998 | } else { |
2999 | wait = true; | |
3000 | } | |
3001 | ||
3002 | spin_unlock(&info->lock); | |
3003 | ||
3004 | if (wait) { | |
e3ccfa98 | 3005 | wait_event(info->allocate_wait, |
9ed74f2d JB |
3006 | !info->allocating_chunk); |
3007 | return 1; | |
3008 | } | |
3009 | ||
3010 | trans = btrfs_start_transaction(root, 1); | |
3011 | if (!trans) { | |
3012 | ret = -ENOMEM; | |
3013 | goto out; | |
3014 | } | |
3015 | ||
3016 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
3017 | 4096 + 2 * 1024 * 1024, | |
3018 | info->flags, 0); | |
3019 | btrfs_end_transaction(trans, root); | |
3020 | if (ret) | |
3021 | goto out; | |
3022 | out: | |
3023 | spin_lock(&info->lock); | |
3024 | info->allocating_chunk = 0; | |
3025 | spin_unlock(&info->lock); | |
e3ccfa98 | 3026 | wake_up(&info->allocate_wait); |
9ed74f2d JB |
3027 | |
3028 | if (ret) | |
3029 | return 0; | |
3030 | return 1; | |
3031 | } | |
3032 | ||
3033 | /* | |
3034 | * Reserve metadata space for delalloc. | |
3035 | */ | |
3036 | int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root, | |
3037 | struct inode *inode, int num_items) | |
3038 | { | |
3039 | struct btrfs_fs_info *info = root->fs_info; | |
3040 | struct btrfs_space_info *meta_sinfo; | |
3041 | u64 num_bytes; | |
3042 | u64 used; | |
3043 | u64 alloc_target; | |
3044 | int flushed = 0; | |
3045 | int force_delalloc; | |
3046 | ||
3047 | /* get the space info for where the metadata will live */ | |
3048 | alloc_target = btrfs_get_alloc_profile(root, 0); | |
3049 | meta_sinfo = __find_space_info(info, alloc_target); | |
3050 | ||
3051 | num_bytes = calculate_bytes_needed(root->fs_info->extent_root, | |
3052 | num_items); | |
3053 | again: | |
3054 | spin_lock(&meta_sinfo->lock); | |
3055 | ||
3056 | force_delalloc = meta_sinfo->force_delalloc; | |
3057 | ||
3058 | if (unlikely(!meta_sinfo->bytes_root)) | |
3059 | meta_sinfo->bytes_root = calculate_bytes_needed(root, 6); | |
3060 | ||
3061 | if (!flushed) | |
3062 | meta_sinfo->bytes_delalloc += num_bytes; | |
3063 | ||
3064 | used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + | |
3065 | meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly + | |
3066 | meta_sinfo->bytes_super + meta_sinfo->bytes_root + | |
3067 | meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc; | |
3068 | ||
3069 | if (used > meta_sinfo->total_bytes) { | |
3070 | flushed++; | |
3071 | ||
3072 | if (flushed == 1) { | |
3073 | if (maybe_allocate_chunk(root, meta_sinfo)) | |
3074 | goto again; | |
3075 | flushed++; | |
3076 | } else { | |
4e06bdd6 | 3077 | spin_unlock(&meta_sinfo->lock); |
9ed74f2d | 3078 | } |
4e06bdd6 | 3079 | |
9ed74f2d JB |
3080 | if (flushed == 2) { |
3081 | filemap_flush(inode->i_mapping); | |
3082 | goto again; | |
3083 | } else if (flushed == 3) { | |
32c00aff | 3084 | flush_delalloc(root, meta_sinfo); |
4e06bdd6 JB |
3085 | goto again; |
3086 | } | |
9ed74f2d JB |
3087 | spin_lock(&meta_sinfo->lock); |
3088 | meta_sinfo->bytes_delalloc -= num_bytes; | |
6a63209f | 3089 | spin_unlock(&meta_sinfo->lock); |
9ed74f2d | 3090 | printk(KERN_ERR "enospc, has %d, reserved %d\n", |
32c00aff JB |
3091 | BTRFS_I(inode)->outstanding_extents, |
3092 | BTRFS_I(inode)->reserved_extents); | |
9ed74f2d JB |
3093 | dump_space_info(meta_sinfo, 0, 0); |
3094 | return -ENOSPC; | |
3095 | } | |
4e06bdd6 | 3096 | |
32c00aff | 3097 | BTRFS_I(inode)->reserved_extents++; |
9ed74f2d JB |
3098 | check_force_delalloc(meta_sinfo); |
3099 | spin_unlock(&meta_sinfo->lock); | |
3100 | ||
3101 | if (!flushed && force_delalloc) | |
3102 | filemap_flush(inode->i_mapping); | |
3103 | ||
3104 | return 0; | |
3105 | } | |
3106 | ||
3107 | /* | |
3108 | * unreserve num_items number of items worth of metadata space. This needs to | |
3109 | * be paired with btrfs_reserve_metadata_space. | |
3110 | * | |
3111 | * NOTE: if you have the option, run this _AFTER_ you do a | |
3112 | * btrfs_end_transaction, since btrfs_end_transaction will run delayed ref | |
3113 | * oprations which will result in more used metadata, so we want to make sure we | |
3114 | * can do that without issue. | |
3115 | */ | |
3116 | int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items) | |
3117 | { | |
3118 | struct btrfs_fs_info *info = root->fs_info; | |
3119 | struct btrfs_space_info *meta_sinfo; | |
3120 | u64 num_bytes; | |
3121 | u64 alloc_target; | |
3122 | bool bug = false; | |
3123 | ||
3124 | /* get the space info for where the metadata will live */ | |
3125 | alloc_target = btrfs_get_alloc_profile(root, 0); | |
3126 | meta_sinfo = __find_space_info(info, alloc_target); | |
3127 | ||
3128 | num_bytes = calculate_bytes_needed(root, num_items); | |
3129 | ||
3130 | spin_lock(&meta_sinfo->lock); | |
3131 | if (meta_sinfo->bytes_may_use < num_bytes) { | |
3132 | bug = true; | |
3133 | meta_sinfo->bytes_may_use = 0; | |
3134 | } else { | |
3135 | meta_sinfo->bytes_may_use -= num_bytes; | |
3136 | } | |
3137 | spin_unlock(&meta_sinfo->lock); | |
3138 | ||
3139 | BUG_ON(bug); | |
3140 | ||
3141 | return 0; | |
3142 | } | |
3143 | ||
3144 | /* | |
3145 | * Reserve some metadata space for use. We'll calculate the worste case number | |
3146 | * of bytes that would be needed to modify num_items number of items. If we | |
3147 | * have space, fantastic, if not, you get -ENOSPC. Please call | |
3148 | * btrfs_unreserve_metadata_space when you are done for the _SAME_ number of | |
3149 | * items you reserved, since whatever metadata you needed should have already | |
3150 | * been allocated. | |
3151 | * | |
3152 | * This will commit the transaction to make more space if we don't have enough | |
3153 | * metadata space. THe only time we don't do this is if we're reserving space | |
3154 | * inside of a transaction, then we will just return -ENOSPC and it is the | |
3155 | * callers responsibility to handle it properly. | |
3156 | */ | |
3157 | int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items) | |
3158 | { | |
3159 | struct btrfs_fs_info *info = root->fs_info; | |
3160 | struct btrfs_space_info *meta_sinfo; | |
3161 | u64 num_bytes; | |
3162 | u64 used; | |
3163 | u64 alloc_target; | |
3164 | int retries = 0; | |
3165 | ||
3166 | /* get the space info for where the metadata will live */ | |
3167 | alloc_target = btrfs_get_alloc_profile(root, 0); | |
3168 | meta_sinfo = __find_space_info(info, alloc_target); | |
3169 | ||
3170 | num_bytes = calculate_bytes_needed(root, num_items); | |
3171 | again: | |
3172 | spin_lock(&meta_sinfo->lock); | |
3173 | ||
3174 | if (unlikely(!meta_sinfo->bytes_root)) | |
3175 | meta_sinfo->bytes_root = calculate_bytes_needed(root, 6); | |
3176 | ||
3177 | if (!retries) | |
3178 | meta_sinfo->bytes_may_use += num_bytes; | |
3179 | ||
3180 | used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + | |
3181 | meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly + | |
3182 | meta_sinfo->bytes_super + meta_sinfo->bytes_root + | |
3183 | meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc; | |
3184 | ||
3185 | if (used > meta_sinfo->total_bytes) { | |
3186 | retries++; | |
3187 | if (retries == 1) { | |
3188 | if (maybe_allocate_chunk(root, meta_sinfo)) | |
3189 | goto again; | |
3190 | retries++; | |
3191 | } else { | |
3192 | spin_unlock(&meta_sinfo->lock); | |
3193 | } | |
3194 | ||
3195 | if (retries == 2) { | |
32c00aff | 3196 | flush_delalloc(root, meta_sinfo); |
4e06bdd6 JB |
3197 | goto again; |
3198 | } | |
9ed74f2d JB |
3199 | spin_lock(&meta_sinfo->lock); |
3200 | meta_sinfo->bytes_may_use -= num_bytes; | |
3201 | spin_unlock(&meta_sinfo->lock); | |
3202 | ||
3203 | dump_space_info(meta_sinfo, 0, 0); | |
6a63209f JB |
3204 | return -ENOSPC; |
3205 | } | |
9ed74f2d JB |
3206 | |
3207 | check_force_delalloc(meta_sinfo); | |
6a63209f JB |
3208 | spin_unlock(&meta_sinfo->lock); |
3209 | ||
3210 | return 0; | |
3211 | } | |
3212 | ||
3213 | /* | |
3214 | * This will check the space that the inode allocates from to make sure we have | |
3215 | * enough space for bytes. | |
3216 | */ | |
3217 | int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, | |
3218 | u64 bytes) | |
3219 | { | |
3220 | struct btrfs_space_info *data_sinfo; | |
4e06bdd6 | 3221 | int ret = 0, committed = 0; |
6a63209f JB |
3222 | |
3223 | /* make sure bytes are sectorsize aligned */ | |
3224 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
3225 | ||
3226 | data_sinfo = BTRFS_I(inode)->space_info; | |
33b4d47f CM |
3227 | if (!data_sinfo) |
3228 | goto alloc; | |
3229 | ||
6a63209f JB |
3230 | again: |
3231 | /* make sure we have enough space to handle the data first */ | |
3232 | spin_lock(&data_sinfo->lock); | |
3233 | if (data_sinfo->total_bytes - data_sinfo->bytes_used - | |
3234 | data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved - | |
3235 | data_sinfo->bytes_pinned - data_sinfo->bytes_readonly - | |
1b2da372 | 3236 | data_sinfo->bytes_may_use - data_sinfo->bytes_super < bytes) { |
4e06bdd6 JB |
3237 | struct btrfs_trans_handle *trans; |
3238 | ||
6a63209f JB |
3239 | /* |
3240 | * if we don't have enough free bytes in this space then we need | |
3241 | * to alloc a new chunk. | |
3242 | */ | |
3243 | if (!data_sinfo->full) { | |
3244 | u64 alloc_target; | |
6a63209f JB |
3245 | |
3246 | data_sinfo->force_alloc = 1; | |
3247 | spin_unlock(&data_sinfo->lock); | |
33b4d47f | 3248 | alloc: |
6a63209f JB |
3249 | alloc_target = btrfs_get_alloc_profile(root, 1); |
3250 | trans = btrfs_start_transaction(root, 1); | |
3251 | if (!trans) | |
3252 | return -ENOMEM; | |
3253 | ||
3254 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
3255 | bytes + 2 * 1024 * 1024, | |
3256 | alloc_target, 0); | |
3257 | btrfs_end_transaction(trans, root); | |
3258 | if (ret) | |
3259 | return ret; | |
33b4d47f CM |
3260 | |
3261 | if (!data_sinfo) { | |
3262 | btrfs_set_inode_space_info(root, inode); | |
3263 | data_sinfo = BTRFS_I(inode)->space_info; | |
3264 | } | |
6a63209f JB |
3265 | goto again; |
3266 | } | |
3267 | spin_unlock(&data_sinfo->lock); | |
4e06bdd6 JB |
3268 | |
3269 | /* commit the current transaction and try again */ | |
dd7e0b7b | 3270 | if (!committed && !root->fs_info->open_ioctl_trans) { |
4e06bdd6 JB |
3271 | committed = 1; |
3272 | trans = btrfs_join_transaction(root, 1); | |
3273 | if (!trans) | |
3274 | return -ENOMEM; | |
3275 | ret = btrfs_commit_transaction(trans, root); | |
3276 | if (ret) | |
3277 | return ret; | |
3278 | goto again; | |
3279 | } | |
3280 | ||
6a63209f JB |
3281 | printk(KERN_ERR "no space left, need %llu, %llu delalloc bytes" |
3282 | ", %llu bytes_used, %llu bytes_reserved, " | |
68f5a38c | 3283 | "%llu bytes_pinned, %llu bytes_readonly, %llu may use " |
21380931 JB |
3284 | "%llu total\n", (unsigned long long)bytes, |
3285 | (unsigned long long)data_sinfo->bytes_delalloc, | |
3286 | (unsigned long long)data_sinfo->bytes_used, | |
3287 | (unsigned long long)data_sinfo->bytes_reserved, | |
3288 | (unsigned long long)data_sinfo->bytes_pinned, | |
3289 | (unsigned long long)data_sinfo->bytes_readonly, | |
3290 | (unsigned long long)data_sinfo->bytes_may_use, | |
3291 | (unsigned long long)data_sinfo->total_bytes); | |
6a63209f JB |
3292 | return -ENOSPC; |
3293 | } | |
3294 | data_sinfo->bytes_may_use += bytes; | |
3295 | BTRFS_I(inode)->reserved_bytes += bytes; | |
3296 | spin_unlock(&data_sinfo->lock); | |
3297 | ||
9ed74f2d | 3298 | return 0; |
6a63209f JB |
3299 | } |
3300 | ||
3301 | /* | |
3302 | * if there was an error for whatever reason after calling | |
3303 | * btrfs_check_data_free_space, call this so we can cleanup the counters. | |
3304 | */ | |
3305 | void btrfs_free_reserved_data_space(struct btrfs_root *root, | |
3306 | struct inode *inode, u64 bytes) | |
3307 | { | |
3308 | struct btrfs_space_info *data_sinfo; | |
3309 | ||
3310 | /* make sure bytes are sectorsize aligned */ | |
3311 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
3312 | ||
3313 | data_sinfo = BTRFS_I(inode)->space_info; | |
3314 | spin_lock(&data_sinfo->lock); | |
3315 | data_sinfo->bytes_may_use -= bytes; | |
3316 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
3317 | spin_unlock(&data_sinfo->lock); | |
3318 | } | |
3319 | ||
3320 | /* called when we are adding a delalloc extent to the inode's io_tree */ | |
3321 | void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode, | |
3322 | u64 bytes) | |
3323 | { | |
3324 | struct btrfs_space_info *data_sinfo; | |
3325 | ||
3326 | /* get the space info for where this inode will be storing its data */ | |
3327 | data_sinfo = BTRFS_I(inode)->space_info; | |
3328 | ||
3329 | /* make sure we have enough space to handle the data first */ | |
3330 | spin_lock(&data_sinfo->lock); | |
3331 | data_sinfo->bytes_delalloc += bytes; | |
3332 | ||
3333 | /* | |
3334 | * we are adding a delalloc extent without calling | |
3335 | * btrfs_check_data_free_space first. This happens on a weird | |
3336 | * writepage condition, but shouldn't hurt our accounting | |
3337 | */ | |
3338 | if (unlikely(bytes > BTRFS_I(inode)->reserved_bytes)) { | |
3339 | data_sinfo->bytes_may_use -= BTRFS_I(inode)->reserved_bytes; | |
3340 | BTRFS_I(inode)->reserved_bytes = 0; | |
3341 | } else { | |
3342 | data_sinfo->bytes_may_use -= bytes; | |
3343 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
3344 | } | |
3345 | ||
3346 | spin_unlock(&data_sinfo->lock); | |
3347 | } | |
3348 | ||
3349 | /* called when we are clearing an delalloc extent from the inode's io_tree */ | |
3350 | void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, | |
3351 | u64 bytes) | |
3352 | { | |
3353 | struct btrfs_space_info *info; | |
3354 | ||
3355 | info = BTRFS_I(inode)->space_info; | |
3356 | ||
3357 | spin_lock(&info->lock); | |
3358 | info->bytes_delalloc -= bytes; | |
3359 | spin_unlock(&info->lock); | |
3360 | } | |
3361 | ||
97e728d4 JB |
3362 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
3363 | { | |
3364 | struct list_head *head = &info->space_info; | |
3365 | struct btrfs_space_info *found; | |
3366 | ||
3367 | rcu_read_lock(); | |
3368 | list_for_each_entry_rcu(found, head, list) { | |
3369 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
3370 | found->force_alloc = 1; | |
3371 | } | |
3372 | rcu_read_unlock(); | |
3373 | } | |
3374 | ||
6324fbf3 CM |
3375 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
3376 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 3377 | u64 flags, int force) |
6324fbf3 CM |
3378 | { |
3379 | struct btrfs_space_info *space_info; | |
97e728d4 | 3380 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6324fbf3 | 3381 | u64 thresh; |
c146afad YZ |
3382 | int ret = 0; |
3383 | ||
97e728d4 | 3384 | mutex_lock(&fs_info->chunk_mutex); |
6324fbf3 | 3385 | |
2b82032c | 3386 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 3387 | |
6324fbf3 | 3388 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3389 | if (!space_info) { |
3390 | ret = update_space_info(extent_root->fs_info, flags, | |
3391 | 0, 0, &space_info); | |
3392 | BUG_ON(ret); | |
3393 | } | |
6324fbf3 CM |
3394 | BUG_ON(!space_info); |
3395 | ||
25179201 | 3396 | spin_lock(&space_info->lock); |
9ed74f2d | 3397 | if (space_info->force_alloc) |
0ef3e66b | 3398 | force = 1; |
25179201 JB |
3399 | if (space_info->full) { |
3400 | spin_unlock(&space_info->lock); | |
925baedd | 3401 | goto out; |
25179201 | 3402 | } |
6324fbf3 | 3403 | |
c146afad | 3404 | thresh = space_info->total_bytes - space_info->bytes_readonly; |
9ed74f2d | 3405 | thresh = div_factor(thresh, 8); |
0ef3e66b | 3406 | if (!force && |
e8569813 | 3407 | (space_info->bytes_used + space_info->bytes_pinned + |
25179201 JB |
3408 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
3409 | spin_unlock(&space_info->lock); | |
925baedd | 3410 | goto out; |
25179201 | 3411 | } |
25179201 JB |
3412 | spin_unlock(&space_info->lock); |
3413 | ||
97e728d4 JB |
3414 | /* |
3415 | * if we're doing a data chunk, go ahead and make sure that | |
3416 | * we keep a reasonable number of metadata chunks allocated in the | |
3417 | * FS as well. | |
3418 | */ | |
9ed74f2d | 3419 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3420 | fs_info->data_chunk_allocations++; |
3421 | if (!(fs_info->data_chunk_allocations % | |
3422 | fs_info->metadata_ratio)) | |
3423 | force_metadata_allocation(fs_info); | |
3424 | } | |
3425 | ||
2b82032c | 3426 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
9ed74f2d | 3427 | spin_lock(&space_info->lock); |
d397712b | 3428 | if (ret) |
6324fbf3 | 3429 | space_info->full = 1; |
9ed74f2d JB |
3430 | space_info->force_alloc = 0; |
3431 | spin_unlock(&space_info->lock); | |
a74a4b97 | 3432 | out: |
c146afad | 3433 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 3434 | return ret; |
6324fbf3 CM |
3435 | } |
3436 | ||
9078a3e1 CM |
3437 | static int update_block_group(struct btrfs_trans_handle *trans, |
3438 | struct btrfs_root *root, | |
db94535d | 3439 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 3440 | int mark_free) |
9078a3e1 CM |
3441 | { |
3442 | struct btrfs_block_group_cache *cache; | |
3443 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 3444 | u64 total = num_bytes; |
9078a3e1 | 3445 | u64 old_val; |
db94535d | 3446 | u64 byte_in_group; |
3e1ad54f | 3447 | |
5d4f98a2 YZ |
3448 | /* block accounting for super block */ |
3449 | spin_lock(&info->delalloc_lock); | |
3450 | old_val = btrfs_super_bytes_used(&info->super_copy); | |
3451 | if (alloc) | |
3452 | old_val += num_bytes; | |
3453 | else | |
3454 | old_val -= num_bytes; | |
3455 | btrfs_set_super_bytes_used(&info->super_copy, old_val); | |
3456 | ||
3457 | /* block accounting for root item */ | |
3458 | old_val = btrfs_root_used(&root->root_item); | |
3459 | if (alloc) | |
3460 | old_val += num_bytes; | |
3461 | else | |
3462 | old_val -= num_bytes; | |
3463 | btrfs_set_root_used(&root->root_item, old_val); | |
3464 | spin_unlock(&info->delalloc_lock); | |
3465 | ||
d397712b | 3466 | while (total) { |
db94535d | 3467 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 3468 | if (!cache) |
9078a3e1 | 3469 | return -1; |
db94535d CM |
3470 | byte_in_group = bytenr - cache->key.objectid; |
3471 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 3472 | |
25179201 | 3473 | spin_lock(&cache->space_info->lock); |
c286ac48 | 3474 | spin_lock(&cache->lock); |
0f9dd46c | 3475 | cache->dirty = 1; |
9078a3e1 | 3476 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 3477 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 3478 | if (alloc) { |
db94535d | 3479 | old_val += num_bytes; |
11833d66 YZ |
3480 | btrfs_set_block_group_used(&cache->item, old_val); |
3481 | cache->reserved -= num_bytes; | |
6324fbf3 | 3482 | cache->space_info->bytes_used += num_bytes; |
11833d66 | 3483 | cache->space_info->bytes_reserved -= num_bytes; |
a512bbf8 | 3484 | if (cache->ro) |
c146afad | 3485 | cache->space_info->bytes_readonly -= num_bytes; |
c286ac48 | 3486 | spin_unlock(&cache->lock); |
25179201 | 3487 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 3488 | } else { |
db94535d | 3489 | old_val -= num_bytes; |
6324fbf3 | 3490 | cache->space_info->bytes_used -= num_bytes; |
c146afad YZ |
3491 | if (cache->ro) |
3492 | cache->space_info->bytes_readonly += num_bytes; | |
c286ac48 CM |
3493 | btrfs_set_block_group_used(&cache->item, old_val); |
3494 | spin_unlock(&cache->lock); | |
25179201 | 3495 | spin_unlock(&cache->space_info->lock); |
f510cfec | 3496 | if (mark_free) { |
0f9dd46c | 3497 | int ret; |
1f3c79a2 LH |
3498 | |
3499 | ret = btrfs_discard_extent(root, bytenr, | |
3500 | num_bytes); | |
3501 | WARN_ON(ret); | |
3502 | ||
0f9dd46c JB |
3503 | ret = btrfs_add_free_space(cache, bytenr, |
3504 | num_bytes); | |
d2fb3437 | 3505 | WARN_ON(ret); |
e37c9e69 | 3506 | } |
cd1bc465 | 3507 | } |
fa9c0d79 | 3508 | btrfs_put_block_group(cache); |
db94535d CM |
3509 | total -= num_bytes; |
3510 | bytenr += num_bytes; | |
9078a3e1 CM |
3511 | } |
3512 | return 0; | |
3513 | } | |
6324fbf3 | 3514 | |
a061fc8d CM |
3515 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
3516 | { | |
0f9dd46c | 3517 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 3518 | u64 bytenr; |
0f9dd46c JB |
3519 | |
3520 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
3521 | if (!cache) | |
a061fc8d | 3522 | return 0; |
0f9dd46c | 3523 | |
d2fb3437 | 3524 | bytenr = cache->key.objectid; |
fa9c0d79 | 3525 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
3526 | |
3527 | return bytenr; | |
a061fc8d CM |
3528 | } |
3529 | ||
11833d66 YZ |
3530 | /* |
3531 | * this function must be called within transaction | |
3532 | */ | |
3533 | int btrfs_pin_extent(struct btrfs_root *root, | |
3534 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 3535 | { |
324ae4df | 3536 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 | 3537 | struct btrfs_block_group_cache *cache; |
324ae4df | 3538 | |
11833d66 YZ |
3539 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
3540 | BUG_ON(!cache); | |
68b38550 | 3541 | |
11833d66 YZ |
3542 | spin_lock(&cache->space_info->lock); |
3543 | spin_lock(&cache->lock); | |
3544 | cache->pinned += num_bytes; | |
3545 | cache->space_info->bytes_pinned += num_bytes; | |
3546 | if (reserved) { | |
3547 | cache->reserved -= num_bytes; | |
3548 | cache->space_info->bytes_reserved -= num_bytes; | |
3549 | } | |
3550 | spin_unlock(&cache->lock); | |
3551 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 3552 | |
11833d66 | 3553 | btrfs_put_block_group(cache); |
68b38550 | 3554 | |
11833d66 YZ |
3555 | set_extent_dirty(fs_info->pinned_extents, |
3556 | bytenr, bytenr + num_bytes - 1, GFP_NOFS); | |
3557 | return 0; | |
3558 | } | |
3559 | ||
3560 | static int update_reserved_extents(struct btrfs_block_group_cache *cache, | |
3561 | u64 num_bytes, int reserve) | |
3562 | { | |
3563 | spin_lock(&cache->space_info->lock); | |
3564 | spin_lock(&cache->lock); | |
3565 | if (reserve) { | |
3566 | cache->reserved += num_bytes; | |
3567 | cache->space_info->bytes_reserved += num_bytes; | |
3568 | } else { | |
3569 | cache->reserved -= num_bytes; | |
3570 | cache->space_info->bytes_reserved -= num_bytes; | |
324ae4df | 3571 | } |
11833d66 YZ |
3572 | spin_unlock(&cache->lock); |
3573 | spin_unlock(&cache->space_info->lock); | |
324ae4df Y |
3574 | return 0; |
3575 | } | |
9078a3e1 | 3576 | |
11833d66 YZ |
3577 | int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
3578 | struct btrfs_root *root) | |
e8569813 | 3579 | { |
e8569813 | 3580 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
3581 | struct btrfs_caching_control *next; |
3582 | struct btrfs_caching_control *caching_ctl; | |
3583 | struct btrfs_block_group_cache *cache; | |
e8569813 | 3584 | |
11833d66 | 3585 | down_write(&fs_info->extent_commit_sem); |
25179201 | 3586 | |
11833d66 YZ |
3587 | list_for_each_entry_safe(caching_ctl, next, |
3588 | &fs_info->caching_block_groups, list) { | |
3589 | cache = caching_ctl->block_group; | |
3590 | if (block_group_cache_done(cache)) { | |
3591 | cache->last_byte_to_unpin = (u64)-1; | |
3592 | list_del_init(&caching_ctl->list); | |
3593 | put_caching_control(caching_ctl); | |
e8569813 | 3594 | } else { |
11833d66 | 3595 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 3596 | } |
e8569813 | 3597 | } |
11833d66 YZ |
3598 | |
3599 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
3600 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
3601 | else | |
3602 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
3603 | ||
3604 | up_write(&fs_info->extent_commit_sem); | |
e8569813 ZY |
3605 | return 0; |
3606 | } | |
3607 | ||
11833d66 | 3608 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 3609 | { |
11833d66 YZ |
3610 | struct btrfs_fs_info *fs_info = root->fs_info; |
3611 | struct btrfs_block_group_cache *cache = NULL; | |
3612 | u64 len; | |
ccd467d6 | 3613 | |
11833d66 YZ |
3614 | while (start <= end) { |
3615 | if (!cache || | |
3616 | start >= cache->key.objectid + cache->key.offset) { | |
3617 | if (cache) | |
3618 | btrfs_put_block_group(cache); | |
3619 | cache = btrfs_lookup_block_group(fs_info, start); | |
3620 | BUG_ON(!cache); | |
3621 | } | |
3622 | ||
3623 | len = cache->key.objectid + cache->key.offset - start; | |
3624 | len = min(len, end + 1 - start); | |
3625 | ||
3626 | if (start < cache->last_byte_to_unpin) { | |
3627 | len = min(len, cache->last_byte_to_unpin - start); | |
3628 | btrfs_add_free_space(cache, start, len); | |
3629 | } | |
3630 | ||
3631 | spin_lock(&cache->space_info->lock); | |
3632 | spin_lock(&cache->lock); | |
3633 | cache->pinned -= len; | |
3634 | cache->space_info->bytes_pinned -= len; | |
3635 | spin_unlock(&cache->lock); | |
3636 | spin_unlock(&cache->space_info->lock); | |
817d52f8 | 3637 | |
11833d66 | 3638 | start += len; |
ccd467d6 | 3639 | } |
11833d66 YZ |
3640 | |
3641 | if (cache) | |
3642 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
3643 | return 0; |
3644 | } | |
3645 | ||
3646 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 3647 | struct btrfs_root *root) |
a28ec197 | 3648 | { |
11833d66 YZ |
3649 | struct btrfs_fs_info *fs_info = root->fs_info; |
3650 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
3651 | u64 start; |
3652 | u64 end; | |
a28ec197 | 3653 | int ret; |
a28ec197 | 3654 | |
11833d66 YZ |
3655 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
3656 | unpin = &fs_info->freed_extents[1]; | |
3657 | else | |
3658 | unpin = &fs_info->freed_extents[0]; | |
3659 | ||
d397712b | 3660 | while (1) { |
1a5bc167 CM |
3661 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
3662 | EXTENT_DIRTY); | |
3663 | if (ret) | |
a28ec197 | 3664 | break; |
1f3c79a2 LH |
3665 | |
3666 | ret = btrfs_discard_extent(root, start, end + 1 - start); | |
3667 | ||
1a5bc167 | 3668 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 3669 | unpin_extent_range(root, start, end); |
b9473439 | 3670 | cond_resched(); |
a28ec197 | 3671 | } |
817d52f8 | 3672 | |
1f3c79a2 | 3673 | return ret; |
a28ec197 CM |
3674 | } |
3675 | ||
31840ae1 ZY |
3676 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
3677 | struct btrfs_root *root, | |
b9473439 | 3678 | struct btrfs_path *path, |
11833d66 YZ |
3679 | u64 bytenr, u64 num_bytes, |
3680 | int is_data, int reserved, | |
b9473439 | 3681 | struct extent_buffer **must_clean) |
e20d96d6 | 3682 | { |
1a5bc167 | 3683 | int err = 0; |
31840ae1 | 3684 | struct extent_buffer *buf; |
8ef97622 | 3685 | |
31840ae1 ZY |
3686 | if (is_data) |
3687 | goto pinit; | |
3688 | ||
444528b3 CM |
3689 | /* |
3690 | * discard is sloooow, and so triggering discards on | |
3691 | * individual btree blocks isn't a good plan. Just | |
3692 | * pin everything in discard mode. | |
3693 | */ | |
3694 | if (btrfs_test_opt(root, DISCARD)) | |
3695 | goto pinit; | |
3696 | ||
31840ae1 ZY |
3697 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
3698 | if (!buf) | |
3699 | goto pinit; | |
3700 | ||
3701 | /* we can reuse a block if it hasn't been written | |
3702 | * and it is from this transaction. We can't | |
3703 | * reuse anything from the tree log root because | |
3704 | * it has tiny sub-transactions. | |
3705 | */ | |
3706 | if (btrfs_buffer_uptodate(buf, 0) && | |
3707 | btrfs_try_tree_lock(buf)) { | |
3708 | u64 header_owner = btrfs_header_owner(buf); | |
3709 | u64 header_transid = btrfs_header_generation(buf); | |
3710 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && | |
3711 | header_transid == trans->transid && | |
3712 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
b9473439 | 3713 | *must_clean = buf; |
31840ae1 | 3714 | return 1; |
8ef97622 | 3715 | } |
31840ae1 | 3716 | btrfs_tree_unlock(buf); |
f4b9aa8d | 3717 | } |
31840ae1 ZY |
3718 | free_extent_buffer(buf); |
3719 | pinit: | |
11833d66 YZ |
3720 | if (path) |
3721 | btrfs_set_path_blocking(path); | |
b9473439 | 3722 | /* unlocks the pinned mutex */ |
11833d66 | 3723 | btrfs_pin_extent(root, bytenr, num_bytes, reserved); |
31840ae1 | 3724 | |
be744175 | 3725 | BUG_ON(err < 0); |
e20d96d6 CM |
3726 | return 0; |
3727 | } | |
3728 | ||
5d4f98a2 YZ |
3729 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
3730 | struct btrfs_root *root, | |
3731 | u64 bytenr, u64 num_bytes, u64 parent, | |
3732 | u64 root_objectid, u64 owner_objectid, | |
3733 | u64 owner_offset, int refs_to_drop, | |
3734 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 3735 | { |
e2fa7227 | 3736 | struct btrfs_key key; |
5d4f98a2 | 3737 | struct btrfs_path *path; |
1261ec42 CM |
3738 | struct btrfs_fs_info *info = root->fs_info; |
3739 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 3740 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
3741 | struct btrfs_extent_item *ei; |
3742 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 3743 | int ret; |
5d4f98a2 | 3744 | int is_data; |
952fccac CM |
3745 | int extent_slot = 0; |
3746 | int found_extent = 0; | |
3747 | int num_to_del = 1; | |
5d4f98a2 YZ |
3748 | u32 item_size; |
3749 | u64 refs; | |
037e6390 | 3750 | |
5caf2a00 | 3751 | path = btrfs_alloc_path(); |
54aa1f4d CM |
3752 | if (!path) |
3753 | return -ENOMEM; | |
5f26f772 | 3754 | |
3c12ac72 | 3755 | path->reada = 1; |
b9473439 | 3756 | path->leave_spinning = 1; |
5d4f98a2 YZ |
3757 | |
3758 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
3759 | BUG_ON(!is_data && refs_to_drop != 1); | |
3760 | ||
3761 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
3762 | bytenr, num_bytes, parent, | |
3763 | root_objectid, owner_objectid, | |
3764 | owner_offset); | |
7bb86316 | 3765 | if (ret == 0) { |
952fccac | 3766 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
3767 | while (extent_slot >= 0) { |
3768 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 3769 | extent_slot); |
5d4f98a2 | 3770 | if (key.objectid != bytenr) |
952fccac | 3771 | break; |
5d4f98a2 YZ |
3772 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
3773 | key.offset == num_bytes) { | |
952fccac CM |
3774 | found_extent = 1; |
3775 | break; | |
3776 | } | |
3777 | if (path->slots[0] - extent_slot > 5) | |
3778 | break; | |
5d4f98a2 | 3779 | extent_slot--; |
952fccac | 3780 | } |
5d4f98a2 YZ |
3781 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
3782 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
3783 | if (found_extent && item_size < sizeof(*ei)) | |
3784 | found_extent = 0; | |
3785 | #endif | |
31840ae1 | 3786 | if (!found_extent) { |
5d4f98a2 | 3787 | BUG_ON(iref); |
56bec294 | 3788 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
3789 | NULL, refs_to_drop, |
3790 | is_data); | |
31840ae1 ZY |
3791 | BUG_ON(ret); |
3792 | btrfs_release_path(extent_root, path); | |
b9473439 | 3793 | path->leave_spinning = 1; |
5d4f98a2 YZ |
3794 | |
3795 | key.objectid = bytenr; | |
3796 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3797 | key.offset = num_bytes; | |
3798 | ||
31840ae1 ZY |
3799 | ret = btrfs_search_slot(trans, extent_root, |
3800 | &key, path, -1, 1); | |
f3465ca4 JB |
3801 | if (ret) { |
3802 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
3803 | ", was looking for %llu\n", ret, |
3804 | (unsigned long long)bytenr); | |
f3465ca4 JB |
3805 | btrfs_print_leaf(extent_root, path->nodes[0]); |
3806 | } | |
31840ae1 ZY |
3807 | BUG_ON(ret); |
3808 | extent_slot = path->slots[0]; | |
3809 | } | |
7bb86316 CM |
3810 | } else { |
3811 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
3812 | WARN_ON(1); | |
d397712b | 3813 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 3814 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 3815 | (unsigned long long)bytenr, |
56bec294 | 3816 | (unsigned long long)parent, |
d397712b | 3817 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
3818 | (unsigned long long)owner_objectid, |
3819 | (unsigned long long)owner_offset); | |
7bb86316 | 3820 | } |
5f39d397 CM |
3821 | |
3822 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
3823 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
3824 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3825 | if (item_size < sizeof(*ei)) { | |
3826 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
3827 | ret = convert_extent_item_v0(trans, extent_root, path, | |
3828 | owner_objectid, 0); | |
3829 | BUG_ON(ret < 0); | |
3830 | ||
3831 | btrfs_release_path(extent_root, path); | |
3832 | path->leave_spinning = 1; | |
3833 | ||
3834 | key.objectid = bytenr; | |
3835 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3836 | key.offset = num_bytes; | |
3837 | ||
3838 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
3839 | -1, 1); | |
3840 | if (ret) { | |
3841 | printk(KERN_ERR "umm, got %d back from search" | |
3842 | ", was looking for %llu\n", ret, | |
3843 | (unsigned long long)bytenr); | |
3844 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
3845 | } | |
3846 | BUG_ON(ret); | |
3847 | extent_slot = path->slots[0]; | |
3848 | leaf = path->nodes[0]; | |
3849 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
3850 | } | |
3851 | #endif | |
3852 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 3853 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 3854 | struct btrfs_extent_item); |
5d4f98a2 YZ |
3855 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
3856 | struct btrfs_tree_block_info *bi; | |
3857 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
3858 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
3859 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
3860 | } | |
56bec294 | 3861 | |
5d4f98a2 | 3862 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
3863 | BUG_ON(refs < refs_to_drop); |
3864 | refs -= refs_to_drop; | |
5f39d397 | 3865 | |
5d4f98a2 YZ |
3866 | if (refs > 0) { |
3867 | if (extent_op) | |
3868 | __run_delayed_extent_op(extent_op, leaf, ei); | |
3869 | /* | |
3870 | * In the case of inline back ref, reference count will | |
3871 | * be updated by remove_extent_backref | |
952fccac | 3872 | */ |
5d4f98a2 YZ |
3873 | if (iref) { |
3874 | BUG_ON(!found_extent); | |
3875 | } else { | |
3876 | btrfs_set_extent_refs(leaf, ei, refs); | |
3877 | btrfs_mark_buffer_dirty(leaf); | |
3878 | } | |
3879 | if (found_extent) { | |
3880 | ret = remove_extent_backref(trans, extent_root, path, | |
3881 | iref, refs_to_drop, | |
3882 | is_data); | |
952fccac CM |
3883 | BUG_ON(ret); |
3884 | } | |
5d4f98a2 YZ |
3885 | } else { |
3886 | int mark_free = 0; | |
b9473439 | 3887 | struct extent_buffer *must_clean = NULL; |
78fae27e | 3888 | |
5d4f98a2 YZ |
3889 | if (found_extent) { |
3890 | BUG_ON(is_data && refs_to_drop != | |
3891 | extent_data_ref_count(root, path, iref)); | |
3892 | if (iref) { | |
3893 | BUG_ON(path->slots[0] != extent_slot); | |
3894 | } else { | |
3895 | BUG_ON(path->slots[0] != extent_slot + 1); | |
3896 | path->slots[0] = extent_slot; | |
3897 | num_to_del = 2; | |
3898 | } | |
78fae27e | 3899 | } |
b9473439 | 3900 | |
5d4f98a2 | 3901 | ret = pin_down_bytes(trans, root, path, bytenr, |
11833d66 | 3902 | num_bytes, is_data, 0, &must_clean); |
5d4f98a2 YZ |
3903 | if (ret > 0) |
3904 | mark_free = 1; | |
3905 | BUG_ON(ret < 0); | |
b9473439 CM |
3906 | /* |
3907 | * it is going to be very rare for someone to be waiting | |
3908 | * on the block we're freeing. del_items might need to | |
3909 | * schedule, so rather than get fancy, just force it | |
3910 | * to blocking here | |
3911 | */ | |
3912 | if (must_clean) | |
3913 | btrfs_set_lock_blocking(must_clean); | |
3914 | ||
952fccac CM |
3915 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
3916 | num_to_del); | |
31840ae1 | 3917 | BUG_ON(ret); |
25179201 | 3918 | btrfs_release_path(extent_root, path); |
21af804c | 3919 | |
b9473439 CM |
3920 | if (must_clean) { |
3921 | clean_tree_block(NULL, root, must_clean); | |
3922 | btrfs_tree_unlock(must_clean); | |
3923 | free_extent_buffer(must_clean); | |
3924 | } | |
3925 | ||
5d4f98a2 | 3926 | if (is_data) { |
459931ec CM |
3927 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
3928 | BUG_ON(ret); | |
d57e62b8 CM |
3929 | } else { |
3930 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
3931 | bytenr >> PAGE_CACHE_SHIFT, | |
3932 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
3933 | } |
3934 | ||
dcbdd4dc CM |
3935 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
3936 | mark_free); | |
3937 | BUG_ON(ret); | |
a28ec197 | 3938 | } |
5caf2a00 | 3939 | btrfs_free_path(path); |
a28ec197 CM |
3940 | return ret; |
3941 | } | |
3942 | ||
1887be66 CM |
3943 | /* |
3944 | * when we free an extent, it is possible (and likely) that we free the last | |
3945 | * delayed ref for that extent as well. This searches the delayed ref tree for | |
3946 | * a given extent, and if there are no other delayed refs to be processed, it | |
3947 | * removes it from the tree. | |
3948 | */ | |
3949 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
3950 | struct btrfs_root *root, u64 bytenr) | |
3951 | { | |
3952 | struct btrfs_delayed_ref_head *head; | |
3953 | struct btrfs_delayed_ref_root *delayed_refs; | |
3954 | struct btrfs_delayed_ref_node *ref; | |
3955 | struct rb_node *node; | |
3956 | int ret; | |
3957 | ||
3958 | delayed_refs = &trans->transaction->delayed_refs; | |
3959 | spin_lock(&delayed_refs->lock); | |
3960 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
3961 | if (!head) | |
3962 | goto out; | |
3963 | ||
3964 | node = rb_prev(&head->node.rb_node); | |
3965 | if (!node) | |
3966 | goto out; | |
3967 | ||
3968 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
3969 | ||
3970 | /* there are still entries for this ref, we can't drop it */ | |
3971 | if (ref->bytenr == bytenr) | |
3972 | goto out; | |
3973 | ||
5d4f98a2 YZ |
3974 | if (head->extent_op) { |
3975 | if (!head->must_insert_reserved) | |
3976 | goto out; | |
3977 | kfree(head->extent_op); | |
3978 | head->extent_op = NULL; | |
3979 | } | |
3980 | ||
1887be66 CM |
3981 | /* |
3982 | * waiting for the lock here would deadlock. If someone else has it | |
3983 | * locked they are already in the process of dropping it anyway | |
3984 | */ | |
3985 | if (!mutex_trylock(&head->mutex)) | |
3986 | goto out; | |
3987 | ||
3988 | /* | |
3989 | * at this point we have a head with no other entries. Go | |
3990 | * ahead and process it. | |
3991 | */ | |
3992 | head->node.in_tree = 0; | |
3993 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 3994 | |
1887be66 CM |
3995 | delayed_refs->num_entries--; |
3996 | ||
3997 | /* | |
3998 | * we don't take a ref on the node because we're removing it from the | |
3999 | * tree, so we just steal the ref the tree was holding. | |
4000 | */ | |
c3e69d58 CM |
4001 | delayed_refs->num_heads--; |
4002 | if (list_empty(&head->cluster)) | |
4003 | delayed_refs->num_heads_ready--; | |
4004 | ||
4005 | list_del_init(&head->cluster); | |
1887be66 CM |
4006 | spin_unlock(&delayed_refs->lock); |
4007 | ||
4008 | ret = run_one_delayed_ref(trans, root->fs_info->tree_root, | |
5d4f98a2 YZ |
4009 | &head->node, head->extent_op, |
4010 | head->must_insert_reserved); | |
1887be66 CM |
4011 | BUG_ON(ret); |
4012 | btrfs_put_delayed_ref(&head->node); | |
4013 | return 0; | |
4014 | out: | |
4015 | spin_unlock(&delayed_refs->lock); | |
4016 | return 0; | |
4017 | } | |
4018 | ||
925baedd | 4019 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
4020 | struct btrfs_root *root, |
4021 | u64 bytenr, u64 num_bytes, u64 parent, | |
5d4f98a2 | 4022 | u64 root_objectid, u64 owner, u64 offset) |
925baedd CM |
4023 | { |
4024 | int ret; | |
4025 | ||
56bec294 CM |
4026 | /* |
4027 | * tree log blocks never actually go into the extent allocation | |
4028 | * tree, just update pinning info and exit early. | |
56bec294 | 4029 | */ |
5d4f98a2 YZ |
4030 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
4031 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 4032 | /* unlocks the pinned mutex */ |
11833d66 | 4033 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 4034 | ret = 0; |
5d4f98a2 YZ |
4035 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
4036 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
4037 | parent, root_objectid, (int)owner, | |
4038 | BTRFS_DROP_DELAYED_REF, NULL); | |
1887be66 CM |
4039 | BUG_ON(ret); |
4040 | ret = check_ref_cleanup(trans, root, bytenr); | |
4041 | BUG_ON(ret); | |
5d4f98a2 YZ |
4042 | } else { |
4043 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
4044 | parent, root_objectid, owner, | |
4045 | offset, BTRFS_DROP_DELAYED_REF, NULL); | |
4046 | BUG_ON(ret); | |
56bec294 | 4047 | } |
925baedd CM |
4048 | return ret; |
4049 | } | |
4050 | ||
87ee04eb CM |
4051 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
4052 | { | |
4053 | u64 mask = ((u64)root->stripesize - 1); | |
4054 | u64 ret = (val + mask) & ~mask; | |
4055 | return ret; | |
4056 | } | |
4057 | ||
817d52f8 JB |
4058 | /* |
4059 | * when we wait for progress in the block group caching, its because | |
4060 | * our allocation attempt failed at least once. So, we must sleep | |
4061 | * and let some progress happen before we try again. | |
4062 | * | |
4063 | * This function will sleep at least once waiting for new free space to | |
4064 | * show up, and then it will check the block group free space numbers | |
4065 | * for our min num_bytes. Another option is to have it go ahead | |
4066 | * and look in the rbtree for a free extent of a given size, but this | |
4067 | * is a good start. | |
4068 | */ | |
4069 | static noinline int | |
4070 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
4071 | u64 num_bytes) | |
4072 | { | |
11833d66 | 4073 | struct btrfs_caching_control *caching_ctl; |
817d52f8 JB |
4074 | DEFINE_WAIT(wait); |
4075 | ||
11833d66 YZ |
4076 | caching_ctl = get_caching_control(cache); |
4077 | if (!caching_ctl) | |
817d52f8 | 4078 | return 0; |
817d52f8 | 4079 | |
11833d66 | 4080 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
817d52f8 | 4081 | (cache->free_space >= num_bytes)); |
11833d66 YZ |
4082 | |
4083 | put_caching_control(caching_ctl); | |
4084 | return 0; | |
4085 | } | |
4086 | ||
4087 | static noinline int | |
4088 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
4089 | { | |
4090 | struct btrfs_caching_control *caching_ctl; | |
4091 | DEFINE_WAIT(wait); | |
4092 | ||
4093 | caching_ctl = get_caching_control(cache); | |
4094 | if (!caching_ctl) | |
4095 | return 0; | |
4096 | ||
4097 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
4098 | ||
4099 | put_caching_control(caching_ctl); | |
817d52f8 JB |
4100 | return 0; |
4101 | } | |
4102 | ||
4103 | enum btrfs_loop_type { | |
4104 | LOOP_CACHED_ONLY = 0, | |
4105 | LOOP_CACHING_NOWAIT = 1, | |
4106 | LOOP_CACHING_WAIT = 2, | |
4107 | LOOP_ALLOC_CHUNK = 3, | |
4108 | LOOP_NO_EMPTY_SIZE = 4, | |
4109 | }; | |
4110 | ||
fec577fb CM |
4111 | /* |
4112 | * walks the btree of allocated extents and find a hole of a given size. | |
4113 | * The key ins is changed to record the hole: | |
4114 | * ins->objectid == block start | |
62e2749e | 4115 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
4116 | * ins->offset == number of blocks |
4117 | * Any available blocks before search_start are skipped. | |
4118 | */ | |
d397712b | 4119 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
4120 | struct btrfs_root *orig_root, |
4121 | u64 num_bytes, u64 empty_size, | |
4122 | u64 search_start, u64 search_end, | |
4123 | u64 hint_byte, struct btrfs_key *ins, | |
4124 | u64 exclude_start, u64 exclude_nr, | |
4125 | int data) | |
fec577fb | 4126 | { |
80eb234a | 4127 | int ret = 0; |
d397712b | 4128 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 4129 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 4130 | struct btrfs_block_group_cache *block_group = NULL; |
239b14b3 | 4131 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 4132 | int allowed_chunk_alloc = 0; |
80eb234a | 4133 | struct btrfs_space_info *space_info; |
fa9c0d79 CM |
4134 | int last_ptr_loop = 0; |
4135 | int loop = 0; | |
817d52f8 | 4136 | bool found_uncached_bg = false; |
0a24325e | 4137 | bool failed_cluster_refill = false; |
1cdda9b8 | 4138 | bool failed_alloc = false; |
fec577fb | 4139 | |
db94535d | 4140 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 4141 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
4142 | ins->objectid = 0; |
4143 | ins->offset = 0; | |
b1a4d965 | 4144 | |
2552d17e JB |
4145 | space_info = __find_space_info(root->fs_info, data); |
4146 | ||
0ef3e66b CM |
4147 | if (orig_root->ref_cows || empty_size) |
4148 | allowed_chunk_alloc = 1; | |
4149 | ||
239b14b3 | 4150 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
fa9c0d79 | 4151 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
4152 | if (!btrfs_test_opt(root, SSD)) |
4153 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
4154 | } |
4155 | ||
fa9c0d79 CM |
4156 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) { |
4157 | last_ptr = &root->fs_info->data_alloc_cluster; | |
4158 | } | |
0f9dd46c | 4159 | |
239b14b3 | 4160 | if (last_ptr) { |
fa9c0d79 CM |
4161 | spin_lock(&last_ptr->lock); |
4162 | if (last_ptr->block_group) | |
4163 | hint_byte = last_ptr->window_start; | |
4164 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 4165 | } |
fa9c0d79 | 4166 | |
a061fc8d | 4167 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 4168 | search_start = max(search_start, hint_byte); |
0b86a832 | 4169 | |
817d52f8 | 4170 | if (!last_ptr) |
fa9c0d79 | 4171 | empty_cluster = 0; |
fa9c0d79 | 4172 | |
2552d17e | 4173 | if (search_start == hint_byte) { |
2552d17e JB |
4174 | block_group = btrfs_lookup_block_group(root->fs_info, |
4175 | search_start); | |
817d52f8 JB |
4176 | /* |
4177 | * we don't want to use the block group if it doesn't match our | |
4178 | * allocation bits, or if its not cached. | |
4179 | */ | |
4180 | if (block_group && block_group_bits(block_group, data) && | |
4181 | block_group_cache_done(block_group)) { | |
2552d17e | 4182 | down_read(&space_info->groups_sem); |
44fb5511 CM |
4183 | if (list_empty(&block_group->list) || |
4184 | block_group->ro) { | |
4185 | /* | |
4186 | * someone is removing this block group, | |
4187 | * we can't jump into the have_block_group | |
4188 | * target because our list pointers are not | |
4189 | * valid | |
4190 | */ | |
4191 | btrfs_put_block_group(block_group); | |
4192 | up_read(&space_info->groups_sem); | |
4193 | } else | |
4194 | goto have_block_group; | |
2552d17e | 4195 | } else if (block_group) { |
fa9c0d79 | 4196 | btrfs_put_block_group(block_group); |
2552d17e | 4197 | } |
42e70e7a | 4198 | } |
4366211c | 4199 | |
2552d17e | 4200 | search: |
80eb234a | 4201 | down_read(&space_info->groups_sem); |
2552d17e | 4202 | list_for_each_entry(block_group, &space_info->block_groups, list) { |
6226cb0a | 4203 | u64 offset; |
817d52f8 | 4204 | int cached; |
8a1413a2 | 4205 | |
2552d17e JB |
4206 | atomic_inc(&block_group->count); |
4207 | search_start = block_group->key.objectid; | |
42e70e7a | 4208 | |
2552d17e | 4209 | have_block_group: |
817d52f8 JB |
4210 | if (unlikely(block_group->cached == BTRFS_CACHE_NO)) { |
4211 | /* | |
4212 | * we want to start caching kthreads, but not too many | |
4213 | * right off the bat so we don't overwhelm the system, | |
4214 | * so only start them if there are less than 2 and we're | |
4215 | * in the initial allocation phase. | |
4216 | */ | |
4217 | if (loop > LOOP_CACHING_NOWAIT || | |
4218 | atomic_read(&space_info->caching_threads) < 2) { | |
4219 | ret = cache_block_group(block_group); | |
4220 | BUG_ON(ret); | |
2552d17e | 4221 | } |
ea6a478e JB |
4222 | } |
4223 | ||
817d52f8 JB |
4224 | cached = block_group_cache_done(block_group); |
4225 | if (unlikely(!cached)) { | |
4226 | found_uncached_bg = true; | |
4227 | ||
4228 | /* if we only want cached bgs, loop */ | |
4229 | if (loop == LOOP_CACHED_ONLY) | |
4230 | goto loop; | |
4231 | } | |
4232 | ||
ea6a478e | 4233 | if (unlikely(block_group->ro)) |
2552d17e | 4234 | goto loop; |
0f9dd46c | 4235 | |
0a24325e JB |
4236 | /* |
4237 | * Ok we want to try and use the cluster allocator, so lets look | |
4238 | * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will | |
4239 | * have tried the cluster allocator plenty of times at this | |
4240 | * point and not have found anything, so we are likely way too | |
4241 | * fragmented for the clustering stuff to find anything, so lets | |
4242 | * just skip it and let the allocator find whatever block it can | |
4243 | * find | |
4244 | */ | |
4245 | if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) { | |
fa9c0d79 CM |
4246 | /* |
4247 | * the refill lock keeps out other | |
4248 | * people trying to start a new cluster | |
4249 | */ | |
4250 | spin_lock(&last_ptr->refill_lock); | |
44fb5511 CM |
4251 | if (last_ptr->block_group && |
4252 | (last_ptr->block_group->ro || | |
4253 | !block_group_bits(last_ptr->block_group, data))) { | |
4254 | offset = 0; | |
4255 | goto refill_cluster; | |
4256 | } | |
4257 | ||
fa9c0d79 CM |
4258 | offset = btrfs_alloc_from_cluster(block_group, last_ptr, |
4259 | num_bytes, search_start); | |
4260 | if (offset) { | |
4261 | /* we have a block, we're done */ | |
4262 | spin_unlock(&last_ptr->refill_lock); | |
4263 | goto checks; | |
4264 | } | |
4265 | ||
4266 | spin_lock(&last_ptr->lock); | |
4267 | /* | |
4268 | * whoops, this cluster doesn't actually point to | |
4269 | * this block group. Get a ref on the block | |
4270 | * group is does point to and try again | |
4271 | */ | |
4272 | if (!last_ptr_loop && last_ptr->block_group && | |
4273 | last_ptr->block_group != block_group) { | |
4274 | ||
4275 | btrfs_put_block_group(block_group); | |
4276 | block_group = last_ptr->block_group; | |
4277 | atomic_inc(&block_group->count); | |
4278 | spin_unlock(&last_ptr->lock); | |
4279 | spin_unlock(&last_ptr->refill_lock); | |
4280 | ||
4281 | last_ptr_loop = 1; | |
4282 | search_start = block_group->key.objectid; | |
44fb5511 CM |
4283 | /* |
4284 | * we know this block group is properly | |
4285 | * in the list because | |
4286 | * btrfs_remove_block_group, drops the | |
4287 | * cluster before it removes the block | |
4288 | * group from the list | |
4289 | */ | |
fa9c0d79 CM |
4290 | goto have_block_group; |
4291 | } | |
4292 | spin_unlock(&last_ptr->lock); | |
44fb5511 | 4293 | refill_cluster: |
fa9c0d79 CM |
4294 | /* |
4295 | * this cluster didn't work out, free it and | |
4296 | * start over | |
4297 | */ | |
4298 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
4299 | ||
4300 | last_ptr_loop = 0; | |
4301 | ||
4302 | /* allocate a cluster in this block group */ | |
451d7585 | 4303 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 CM |
4304 | block_group, last_ptr, |
4305 | offset, num_bytes, | |
4306 | empty_cluster + empty_size); | |
4307 | if (ret == 0) { | |
4308 | /* | |
4309 | * now pull our allocation out of this | |
4310 | * cluster | |
4311 | */ | |
4312 | offset = btrfs_alloc_from_cluster(block_group, | |
4313 | last_ptr, num_bytes, | |
4314 | search_start); | |
4315 | if (offset) { | |
4316 | /* we found one, proceed */ | |
4317 | spin_unlock(&last_ptr->refill_lock); | |
4318 | goto checks; | |
4319 | } | |
0a24325e JB |
4320 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
4321 | && !failed_cluster_refill) { | |
817d52f8 JB |
4322 | spin_unlock(&last_ptr->refill_lock); |
4323 | ||
0a24325e | 4324 | failed_cluster_refill = true; |
817d52f8 JB |
4325 | wait_block_group_cache_progress(block_group, |
4326 | num_bytes + empty_cluster + empty_size); | |
4327 | goto have_block_group; | |
fa9c0d79 | 4328 | } |
817d52f8 | 4329 | |
fa9c0d79 CM |
4330 | /* |
4331 | * at this point we either didn't find a cluster | |
4332 | * or we weren't able to allocate a block from our | |
4333 | * cluster. Free the cluster we've been trying | |
4334 | * to use, and go to the next block group | |
4335 | */ | |
0a24325e | 4336 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 4337 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 4338 | goto loop; |
fa9c0d79 CM |
4339 | } |
4340 | ||
6226cb0a JB |
4341 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
4342 | num_bytes, empty_size); | |
1cdda9b8 JB |
4343 | /* |
4344 | * If we didn't find a chunk, and we haven't failed on this | |
4345 | * block group before, and this block group is in the middle of | |
4346 | * caching and we are ok with waiting, then go ahead and wait | |
4347 | * for progress to be made, and set failed_alloc to true. | |
4348 | * | |
4349 | * If failed_alloc is true then we've already waited on this | |
4350 | * block group once and should move on to the next block group. | |
4351 | */ | |
4352 | if (!offset && !failed_alloc && !cached && | |
4353 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 4354 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
4355 | num_bytes + empty_size); |
4356 | failed_alloc = true; | |
817d52f8 | 4357 | goto have_block_group; |
1cdda9b8 JB |
4358 | } else if (!offset) { |
4359 | goto loop; | |
817d52f8 | 4360 | } |
fa9c0d79 | 4361 | checks: |
6226cb0a | 4362 | search_start = stripe_align(root, offset); |
2552d17e | 4363 | /* move on to the next group */ |
6226cb0a JB |
4364 | if (search_start + num_bytes >= search_end) { |
4365 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 4366 | goto loop; |
6226cb0a | 4367 | } |
25179201 | 4368 | |
2552d17e JB |
4369 | /* move on to the next group */ |
4370 | if (search_start + num_bytes > | |
6226cb0a JB |
4371 | block_group->key.objectid + block_group->key.offset) { |
4372 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 4373 | goto loop; |
6226cb0a | 4374 | } |
f5a31e16 | 4375 | |
2552d17e JB |
4376 | if (exclude_nr > 0 && |
4377 | (search_start + num_bytes > exclude_start && | |
4378 | search_start < exclude_start + exclude_nr)) { | |
4379 | search_start = exclude_start + exclude_nr; | |
4380 | ||
6226cb0a | 4381 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e JB |
4382 | /* |
4383 | * if search_start is still in this block group | |
4384 | * then we just re-search this block group | |
f5a31e16 | 4385 | */ |
2552d17e JB |
4386 | if (search_start >= block_group->key.objectid && |
4387 | search_start < (block_group->key.objectid + | |
6226cb0a | 4388 | block_group->key.offset)) |
2552d17e | 4389 | goto have_block_group; |
2552d17e | 4390 | goto loop; |
0f9dd46c | 4391 | } |
0b86a832 | 4392 | |
2552d17e JB |
4393 | ins->objectid = search_start; |
4394 | ins->offset = num_bytes; | |
d2fb3437 | 4395 | |
6226cb0a JB |
4396 | if (offset < search_start) |
4397 | btrfs_add_free_space(block_group, offset, | |
4398 | search_start - offset); | |
4399 | BUG_ON(offset > search_start); | |
4400 | ||
11833d66 YZ |
4401 | update_reserved_extents(block_group, num_bytes, 1); |
4402 | ||
2552d17e | 4403 | /* we are all good, lets return */ |
2552d17e JB |
4404 | break; |
4405 | loop: | |
0a24325e | 4406 | failed_cluster_refill = false; |
1cdda9b8 | 4407 | failed_alloc = false; |
fa9c0d79 | 4408 | btrfs_put_block_group(block_group); |
2552d17e JB |
4409 | } |
4410 | up_read(&space_info->groups_sem); | |
4411 | ||
817d52f8 JB |
4412 | /* LOOP_CACHED_ONLY, only search fully cached block groups |
4413 | * LOOP_CACHING_NOWAIT, search partially cached block groups, but | |
4414 | * dont wait foR them to finish caching | |
4415 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching | |
4416 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
4417 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
4418 | * again | |
fa9c0d79 | 4419 | */ |
817d52f8 JB |
4420 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE && |
4421 | (found_uncached_bg || empty_size || empty_cluster || | |
4422 | allowed_chunk_alloc)) { | |
4423 | if (found_uncached_bg) { | |
4424 | found_uncached_bg = false; | |
4425 | if (loop < LOOP_CACHING_WAIT) { | |
4426 | loop++; | |
4427 | goto search; | |
4428 | } | |
4429 | } | |
4430 | ||
4431 | if (loop == LOOP_ALLOC_CHUNK) { | |
fa9c0d79 CM |
4432 | empty_size = 0; |
4433 | empty_cluster = 0; | |
4434 | } | |
2552d17e JB |
4435 | |
4436 | if (allowed_chunk_alloc) { | |
4437 | ret = do_chunk_alloc(trans, root, num_bytes + | |
4438 | 2 * 1024 * 1024, data, 1); | |
2552d17e JB |
4439 | allowed_chunk_alloc = 0; |
4440 | } else { | |
4441 | space_info->force_alloc = 1; | |
4442 | } | |
4443 | ||
817d52f8 | 4444 | if (loop < LOOP_NO_EMPTY_SIZE) { |
fa9c0d79 | 4445 | loop++; |
2552d17e | 4446 | goto search; |
fa9c0d79 | 4447 | } |
2552d17e JB |
4448 | ret = -ENOSPC; |
4449 | } else if (!ins->objectid) { | |
4450 | ret = -ENOSPC; | |
f2654de4 | 4451 | } |
0b86a832 | 4452 | |
80eb234a JB |
4453 | /* we found what we needed */ |
4454 | if (ins->objectid) { | |
4455 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
d2fb3437 | 4456 | trans->block_group = block_group->key.objectid; |
0f9dd46c | 4457 | |
fa9c0d79 | 4458 | btrfs_put_block_group(block_group); |
80eb234a | 4459 | ret = 0; |
be744175 | 4460 | } |
be744175 | 4461 | |
0f70abe2 | 4462 | return ret; |
fec577fb | 4463 | } |
ec44a35c | 4464 | |
9ed74f2d JB |
4465 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
4466 | int dump_block_groups) | |
0f9dd46c JB |
4467 | { |
4468 | struct btrfs_block_group_cache *cache; | |
0f9dd46c | 4469 | |
9ed74f2d | 4470 | spin_lock(&info->lock); |
d397712b CM |
4471 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
4472 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
9ed74f2d JB |
4473 | info->bytes_pinned - info->bytes_reserved - |
4474 | info->bytes_super), | |
d397712b | 4475 | (info->full) ? "" : "not "); |
6a63209f | 4476 | printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu," |
9ed74f2d JB |
4477 | " may_use=%llu, used=%llu, root=%llu, super=%llu, reserved=%llu" |
4478 | "\n", | |
21380931 JB |
4479 | (unsigned long long)info->total_bytes, |
4480 | (unsigned long long)info->bytes_pinned, | |
4481 | (unsigned long long)info->bytes_delalloc, | |
4482 | (unsigned long long)info->bytes_may_use, | |
9ed74f2d JB |
4483 | (unsigned long long)info->bytes_used, |
4484 | (unsigned long long)info->bytes_root, | |
4485 | (unsigned long long)info->bytes_super, | |
4486 | (unsigned long long)info->bytes_reserved); | |
4487 | spin_unlock(&info->lock); | |
4488 | ||
4489 | if (!dump_block_groups) | |
4490 | return; | |
0f9dd46c | 4491 | |
80eb234a | 4492 | down_read(&info->groups_sem); |
c6e30871 | 4493 | list_for_each_entry(cache, &info->block_groups, list) { |
0f9dd46c | 4494 | spin_lock(&cache->lock); |
d397712b CM |
4495 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
4496 | "%llu pinned %llu reserved\n", | |
4497 | (unsigned long long)cache->key.objectid, | |
4498 | (unsigned long long)cache->key.offset, | |
4499 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
4500 | (unsigned long long)cache->pinned, | |
4501 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
4502 | btrfs_dump_free_space(cache, bytes); |
4503 | spin_unlock(&cache->lock); | |
4504 | } | |
80eb234a | 4505 | up_read(&info->groups_sem); |
0f9dd46c | 4506 | } |
e8569813 | 4507 | |
11833d66 YZ |
4508 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
4509 | struct btrfs_root *root, | |
4510 | u64 num_bytes, u64 min_alloc_size, | |
4511 | u64 empty_size, u64 hint_byte, | |
4512 | u64 search_end, struct btrfs_key *ins, | |
4513 | u64 data) | |
fec577fb CM |
4514 | { |
4515 | int ret; | |
fbdc762b | 4516 | u64 search_start = 0; |
1261ec42 | 4517 | struct btrfs_fs_info *info = root->fs_info; |
925baedd | 4518 | |
6a63209f | 4519 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 4520 | again: |
0ef3e66b CM |
4521 | /* |
4522 | * the only place that sets empty_size is btrfs_realloc_node, which | |
4523 | * is not called recursively on allocations | |
4524 | */ | |
4525 | if (empty_size || root->ref_cows) { | |
593060d7 | 4526 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 4527 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
4528 | 2 * 1024 * 1024, |
4529 | BTRFS_BLOCK_GROUP_METADATA | | |
4530 | (info->metadata_alloc_profile & | |
4531 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
4532 | } |
4533 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 4534 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 | 4535 | } |
0b86a832 | 4536 | |
db94535d CM |
4537 | WARN_ON(num_bytes < root->sectorsize); |
4538 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
4539 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
4540 | trans->alloc_exclude_start, |
4541 | trans->alloc_exclude_nr, data); | |
3b951516 | 4542 | |
98d20f67 CM |
4543 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
4544 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 4545 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 4546 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
4547 | do_chunk_alloc(trans, root->fs_info->extent_root, |
4548 | num_bytes, data, 1); | |
98d20f67 CM |
4549 | goto again; |
4550 | } | |
817d52f8 | 4551 | if (ret == -ENOSPC) { |
0f9dd46c JB |
4552 | struct btrfs_space_info *sinfo; |
4553 | ||
4554 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
4555 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
4556 | "wanted %llu\n", (unsigned long long)data, | |
4557 | (unsigned long long)num_bytes); | |
9ed74f2d | 4558 | dump_space_info(sinfo, num_bytes, 1); |
925baedd | 4559 | } |
0f9dd46c JB |
4560 | |
4561 | return ret; | |
e6dcd2dc CM |
4562 | } |
4563 | ||
65b51a00 CM |
4564 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
4565 | { | |
0f9dd46c | 4566 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 4567 | int ret = 0; |
0f9dd46c | 4568 | |
0f9dd46c JB |
4569 | cache = btrfs_lookup_block_group(root->fs_info, start); |
4570 | if (!cache) { | |
d397712b CM |
4571 | printk(KERN_ERR "Unable to find block group for %llu\n", |
4572 | (unsigned long long)start); | |
0f9dd46c JB |
4573 | return -ENOSPC; |
4574 | } | |
1f3c79a2 LH |
4575 | |
4576 | ret = btrfs_discard_extent(root, start, len); | |
4577 | ||
0f9dd46c | 4578 | btrfs_add_free_space(cache, start, len); |
11833d66 | 4579 | update_reserved_extents(cache, len, 0); |
fa9c0d79 | 4580 | btrfs_put_block_group(cache); |
817d52f8 | 4581 | |
e6dcd2dc CM |
4582 | return ret; |
4583 | } | |
4584 | ||
5d4f98a2 YZ |
4585 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
4586 | struct btrfs_root *root, | |
4587 | u64 parent, u64 root_objectid, | |
4588 | u64 flags, u64 owner, u64 offset, | |
4589 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
4590 | { |
4591 | int ret; | |
5d4f98a2 | 4592 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 4593 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 4594 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 4595 | struct btrfs_path *path; |
5d4f98a2 YZ |
4596 | struct extent_buffer *leaf; |
4597 | int type; | |
4598 | u32 size; | |
26b8003f | 4599 | |
5d4f98a2 YZ |
4600 | if (parent > 0) |
4601 | type = BTRFS_SHARED_DATA_REF_KEY; | |
4602 | else | |
4603 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 4604 | |
5d4f98a2 | 4605 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
4606 | |
4607 | path = btrfs_alloc_path(); | |
4608 | BUG_ON(!path); | |
47e4bb98 | 4609 | |
b9473439 | 4610 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4611 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
4612 | ins, size); | |
ccd467d6 | 4613 | BUG_ON(ret); |
0f9dd46c | 4614 | |
5d4f98a2 YZ |
4615 | leaf = path->nodes[0]; |
4616 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 4617 | struct btrfs_extent_item); |
5d4f98a2 YZ |
4618 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
4619 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
4620 | btrfs_set_extent_flags(leaf, extent_item, | |
4621 | flags | BTRFS_EXTENT_FLAG_DATA); | |
4622 | ||
4623 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
4624 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
4625 | if (parent > 0) { | |
4626 | struct btrfs_shared_data_ref *ref; | |
4627 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
4628 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
4629 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
4630 | } else { | |
4631 | struct btrfs_extent_data_ref *ref; | |
4632 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
4633 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
4634 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
4635 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
4636 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
4637 | } | |
47e4bb98 CM |
4638 | |
4639 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 4640 | btrfs_free_path(path); |
f510cfec | 4641 | |
5d4f98a2 YZ |
4642 | ret = update_block_group(trans, root, ins->objectid, ins->offset, |
4643 | 1, 0); | |
f5947066 | 4644 | if (ret) { |
d397712b CM |
4645 | printk(KERN_ERR "btrfs update block group failed for %llu " |
4646 | "%llu\n", (unsigned long long)ins->objectid, | |
4647 | (unsigned long long)ins->offset); | |
f5947066 CM |
4648 | BUG(); |
4649 | } | |
e6dcd2dc CM |
4650 | return ret; |
4651 | } | |
4652 | ||
5d4f98a2 YZ |
4653 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
4654 | struct btrfs_root *root, | |
4655 | u64 parent, u64 root_objectid, | |
4656 | u64 flags, struct btrfs_disk_key *key, | |
4657 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
4658 | { |
4659 | int ret; | |
5d4f98a2 YZ |
4660 | struct btrfs_fs_info *fs_info = root->fs_info; |
4661 | struct btrfs_extent_item *extent_item; | |
4662 | struct btrfs_tree_block_info *block_info; | |
4663 | struct btrfs_extent_inline_ref *iref; | |
4664 | struct btrfs_path *path; | |
4665 | struct extent_buffer *leaf; | |
4666 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 4667 | |
5d4f98a2 YZ |
4668 | path = btrfs_alloc_path(); |
4669 | BUG_ON(!path); | |
56bec294 | 4670 | |
5d4f98a2 YZ |
4671 | path->leave_spinning = 1; |
4672 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
4673 | ins, size); | |
56bec294 | 4674 | BUG_ON(ret); |
5d4f98a2 YZ |
4675 | |
4676 | leaf = path->nodes[0]; | |
4677 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
4678 | struct btrfs_extent_item); | |
4679 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
4680 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
4681 | btrfs_set_extent_flags(leaf, extent_item, | |
4682 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
4683 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
4684 | ||
4685 | btrfs_set_tree_block_key(leaf, block_info, key); | |
4686 | btrfs_set_tree_block_level(leaf, block_info, level); | |
4687 | ||
4688 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
4689 | if (parent > 0) { | |
4690 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
4691 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
4692 | BTRFS_SHARED_BLOCK_REF_KEY); | |
4693 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
4694 | } else { | |
4695 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
4696 | BTRFS_TREE_BLOCK_REF_KEY); | |
4697 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
4698 | } | |
4699 | ||
4700 | btrfs_mark_buffer_dirty(leaf); | |
4701 | btrfs_free_path(path); | |
4702 | ||
4703 | ret = update_block_group(trans, root, ins->objectid, ins->offset, | |
4704 | 1, 0); | |
4705 | if (ret) { | |
4706 | printk(KERN_ERR "btrfs update block group failed for %llu " | |
4707 | "%llu\n", (unsigned long long)ins->objectid, | |
4708 | (unsigned long long)ins->offset); | |
4709 | BUG(); | |
4710 | } | |
4711 | return ret; | |
4712 | } | |
4713 | ||
4714 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
4715 | struct btrfs_root *root, | |
4716 | u64 root_objectid, u64 owner, | |
4717 | u64 offset, struct btrfs_key *ins) | |
4718 | { | |
4719 | int ret; | |
4720 | ||
4721 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
4722 | ||
4723 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, | |
4724 | 0, root_objectid, owner, offset, | |
4725 | BTRFS_ADD_DELAYED_EXTENT, NULL); | |
e6dcd2dc CM |
4726 | return ret; |
4727 | } | |
e02119d5 CM |
4728 | |
4729 | /* | |
4730 | * this is used by the tree logging recovery code. It records that | |
4731 | * an extent has been allocated and makes sure to clear the free | |
4732 | * space cache bits as well | |
4733 | */ | |
5d4f98a2 YZ |
4734 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
4735 | struct btrfs_root *root, | |
4736 | u64 root_objectid, u64 owner, u64 offset, | |
4737 | struct btrfs_key *ins) | |
e02119d5 CM |
4738 | { |
4739 | int ret; | |
4740 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
4741 | struct btrfs_caching_control *caching_ctl; |
4742 | u64 start = ins->objectid; | |
4743 | u64 num_bytes = ins->offset; | |
e02119d5 | 4744 | |
e02119d5 | 4745 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
817d52f8 | 4746 | cache_block_group(block_group); |
11833d66 | 4747 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 4748 | |
11833d66 YZ |
4749 | if (!caching_ctl) { |
4750 | BUG_ON(!block_group_cache_done(block_group)); | |
4751 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
4752 | BUG_ON(ret); | |
4753 | } else { | |
4754 | mutex_lock(&caching_ctl->mutex); | |
4755 | ||
4756 | if (start >= caching_ctl->progress) { | |
4757 | ret = add_excluded_extent(root, start, num_bytes); | |
4758 | BUG_ON(ret); | |
4759 | } else if (start + num_bytes <= caching_ctl->progress) { | |
4760 | ret = btrfs_remove_free_space(block_group, | |
4761 | start, num_bytes); | |
4762 | BUG_ON(ret); | |
4763 | } else { | |
4764 | num_bytes = caching_ctl->progress - start; | |
4765 | ret = btrfs_remove_free_space(block_group, | |
4766 | start, num_bytes); | |
4767 | BUG_ON(ret); | |
4768 | ||
4769 | start = caching_ctl->progress; | |
4770 | num_bytes = ins->objectid + ins->offset - | |
4771 | caching_ctl->progress; | |
4772 | ret = add_excluded_extent(root, start, num_bytes); | |
4773 | BUG_ON(ret); | |
4774 | } | |
4775 | ||
4776 | mutex_unlock(&caching_ctl->mutex); | |
4777 | put_caching_control(caching_ctl); | |
4778 | } | |
4779 | ||
4780 | update_reserved_extents(block_group, ins->offset, 1); | |
fa9c0d79 | 4781 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
4782 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
4783 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
4784 | return ret; |
4785 | } | |
4786 | ||
e6dcd2dc CM |
4787 | /* |
4788 | * finds a free extent and does all the dirty work required for allocation | |
4789 | * returns the key for the extent through ins, and a tree buffer for | |
4790 | * the first block of the extent through buf. | |
4791 | * | |
4792 | * returns 0 if everything worked, non-zero otherwise. | |
4793 | */ | |
5d4f98a2 YZ |
4794 | static int alloc_tree_block(struct btrfs_trans_handle *trans, |
4795 | struct btrfs_root *root, | |
4796 | u64 num_bytes, u64 parent, u64 root_objectid, | |
4797 | struct btrfs_disk_key *key, int level, | |
4798 | u64 empty_size, u64 hint_byte, u64 search_end, | |
4799 | struct btrfs_key *ins) | |
e6dcd2dc CM |
4800 | { |
4801 | int ret; | |
5d4f98a2 YZ |
4802 | u64 flags = 0; |
4803 | ||
11833d66 YZ |
4804 | ret = btrfs_reserve_extent(trans, root, num_bytes, num_bytes, |
4805 | empty_size, hint_byte, search_end, | |
4806 | ins, 0); | |
817d52f8 JB |
4807 | if (ret) |
4808 | return ret; | |
5d4f98a2 YZ |
4809 | |
4810 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
4811 | if (parent == 0) | |
4812 | parent = ins->objectid; | |
4813 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
4814 | } else | |
4815 | BUG_ON(parent > 0); | |
4816 | ||
d00aff00 | 4817 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
5d4f98a2 YZ |
4818 | struct btrfs_delayed_extent_op *extent_op; |
4819 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
4820 | BUG_ON(!extent_op); | |
4821 | if (key) | |
4822 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
4823 | else | |
4824 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
4825 | extent_op->flags_to_set = flags; | |
4826 | extent_op->update_key = 1; | |
4827 | extent_op->update_flags = 1; | |
4828 | extent_op->is_data = 0; | |
4829 | ||
4830 | ret = btrfs_add_delayed_tree_ref(trans, ins->objectid, | |
4831 | ins->offset, parent, root_objectid, | |
4832 | level, BTRFS_ADD_DELAYED_EXTENT, | |
4833 | extent_op); | |
d00aff00 | 4834 | BUG_ON(ret); |
d00aff00 | 4835 | } |
925baedd | 4836 | return ret; |
fec577fb | 4837 | } |
65b51a00 CM |
4838 | |
4839 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, | |
4840 | struct btrfs_root *root, | |
4008c04a CM |
4841 | u64 bytenr, u32 blocksize, |
4842 | int level) | |
65b51a00 CM |
4843 | { |
4844 | struct extent_buffer *buf; | |
4845 | ||
4846 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
4847 | if (!buf) | |
4848 | return ERR_PTR(-ENOMEM); | |
4849 | btrfs_set_header_generation(buf, trans->transid); | |
4008c04a | 4850 | btrfs_set_buffer_lockdep_class(buf, level); |
65b51a00 CM |
4851 | btrfs_tree_lock(buf); |
4852 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
4853 | |
4854 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 4855 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 4856 | |
d0c803c4 CM |
4857 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
4858 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
4859 | buf->start + buf->len - 1, GFP_NOFS); | |
4860 | } else { | |
4861 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 4862 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 4863 | } |
65b51a00 | 4864 | trans->blocks_used++; |
b4ce94de | 4865 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
4866 | return buf; |
4867 | } | |
4868 | ||
fec577fb CM |
4869 | /* |
4870 | * helper function to allocate a block for a given tree | |
4871 | * returns the tree buffer or NULL. | |
4872 | */ | |
5f39d397 | 4873 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
4874 | struct btrfs_root *root, u32 blocksize, |
4875 | u64 parent, u64 root_objectid, | |
4876 | struct btrfs_disk_key *key, int level, | |
4877 | u64 hint, u64 empty_size) | |
fec577fb | 4878 | { |
e2fa7227 | 4879 | struct btrfs_key ins; |
fec577fb | 4880 | int ret; |
5f39d397 | 4881 | struct extent_buffer *buf; |
fec577fb | 4882 | |
5d4f98a2 YZ |
4883 | ret = alloc_tree_block(trans, root, blocksize, parent, root_objectid, |
4884 | key, level, empty_size, hint, (u64)-1, &ins); | |
fec577fb | 4885 | if (ret) { |
54aa1f4d CM |
4886 | BUG_ON(ret > 0); |
4887 | return ERR_PTR(ret); | |
fec577fb | 4888 | } |
55c69072 | 4889 | |
4008c04a CM |
4890 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
4891 | blocksize, level); | |
fec577fb CM |
4892 | return buf; |
4893 | } | |
a28ec197 | 4894 | |
2c47e605 YZ |
4895 | struct walk_control { |
4896 | u64 refs[BTRFS_MAX_LEVEL]; | |
4897 | u64 flags[BTRFS_MAX_LEVEL]; | |
4898 | struct btrfs_key update_progress; | |
4899 | int stage; | |
4900 | int level; | |
4901 | int shared_level; | |
4902 | int update_ref; | |
4903 | int keep_locks; | |
1c4850e2 YZ |
4904 | int reada_slot; |
4905 | int reada_count; | |
2c47e605 YZ |
4906 | }; |
4907 | ||
4908 | #define DROP_REFERENCE 1 | |
4909 | #define UPDATE_BACKREF 2 | |
4910 | ||
1c4850e2 YZ |
4911 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
4912 | struct btrfs_root *root, | |
4913 | struct walk_control *wc, | |
4914 | struct btrfs_path *path) | |
4915 | { | |
4916 | u64 bytenr; | |
4917 | u64 generation; | |
4918 | u64 refs; | |
94fcca9f | 4919 | u64 flags; |
1c4850e2 YZ |
4920 | u64 last = 0; |
4921 | u32 nritems; | |
4922 | u32 blocksize; | |
4923 | struct btrfs_key key; | |
4924 | struct extent_buffer *eb; | |
4925 | int ret; | |
4926 | int slot; | |
4927 | int nread = 0; | |
4928 | ||
4929 | if (path->slots[wc->level] < wc->reada_slot) { | |
4930 | wc->reada_count = wc->reada_count * 2 / 3; | |
4931 | wc->reada_count = max(wc->reada_count, 2); | |
4932 | } else { | |
4933 | wc->reada_count = wc->reada_count * 3 / 2; | |
4934 | wc->reada_count = min_t(int, wc->reada_count, | |
4935 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
4936 | } | |
4937 | ||
4938 | eb = path->nodes[wc->level]; | |
4939 | nritems = btrfs_header_nritems(eb); | |
4940 | blocksize = btrfs_level_size(root, wc->level - 1); | |
4941 | ||
4942 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { | |
4943 | if (nread >= wc->reada_count) | |
4944 | break; | |
4945 | ||
4946 | cond_resched(); | |
4947 | bytenr = btrfs_node_blockptr(eb, slot); | |
4948 | generation = btrfs_node_ptr_generation(eb, slot); | |
4949 | ||
4950 | if (slot == path->slots[wc->level]) | |
4951 | goto reada; | |
4952 | ||
4953 | if (wc->stage == UPDATE_BACKREF && | |
4954 | generation <= root->root_key.offset) | |
4955 | continue; | |
4956 | ||
94fcca9f YZ |
4957 | /* We don't lock the tree block, it's OK to be racy here */ |
4958 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
4959 | &refs, &flags); | |
4960 | BUG_ON(ret); | |
4961 | BUG_ON(refs == 0); | |
4962 | ||
1c4850e2 | 4963 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
4964 | if (refs == 1) |
4965 | goto reada; | |
4966 | ||
94fcca9f YZ |
4967 | if (wc->level == 1 && |
4968 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
4969 | continue; | |
1c4850e2 YZ |
4970 | if (!wc->update_ref || |
4971 | generation <= root->root_key.offset) | |
4972 | continue; | |
4973 | btrfs_node_key_to_cpu(eb, &key, slot); | |
4974 | ret = btrfs_comp_cpu_keys(&key, | |
4975 | &wc->update_progress); | |
4976 | if (ret < 0) | |
4977 | continue; | |
94fcca9f YZ |
4978 | } else { |
4979 | if (wc->level == 1 && | |
4980 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
4981 | continue; | |
1c4850e2 YZ |
4982 | } |
4983 | reada: | |
4984 | ret = readahead_tree_block(root, bytenr, blocksize, | |
4985 | generation); | |
4986 | if (ret) | |
4987 | break; | |
4988 | last = bytenr + blocksize; | |
4989 | nread++; | |
4990 | } | |
4991 | wc->reada_slot = slot; | |
4992 | } | |
4993 | ||
f82d02d9 | 4994 | /* |
2c47e605 YZ |
4995 | * hepler to process tree block while walking down the tree. |
4996 | * | |
2c47e605 YZ |
4997 | * when wc->stage == UPDATE_BACKREF, this function updates |
4998 | * back refs for pointers in the block. | |
4999 | * | |
5000 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 5001 | */ |
2c47e605 | 5002 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 5003 | struct btrfs_root *root, |
2c47e605 | 5004 | struct btrfs_path *path, |
94fcca9f | 5005 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 5006 | { |
2c47e605 YZ |
5007 | int level = wc->level; |
5008 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 5009 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
5010 | int ret; |
5011 | ||
2c47e605 YZ |
5012 | if (wc->stage == UPDATE_BACKREF && |
5013 | btrfs_header_owner(eb) != root->root_key.objectid) | |
5014 | return 1; | |
f82d02d9 | 5015 | |
2c47e605 YZ |
5016 | /* |
5017 | * when reference count of tree block is 1, it won't increase | |
5018 | * again. once full backref flag is set, we never clear it. | |
5019 | */ | |
94fcca9f YZ |
5020 | if (lookup_info && |
5021 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
5022 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
5023 | BUG_ON(!path->locks[level]); |
5024 | ret = btrfs_lookup_extent_info(trans, root, | |
5025 | eb->start, eb->len, | |
5026 | &wc->refs[level], | |
5027 | &wc->flags[level]); | |
5028 | BUG_ON(ret); | |
5029 | BUG_ON(wc->refs[level] == 0); | |
5030 | } | |
5d4f98a2 | 5031 | |
2c47e605 YZ |
5032 | if (wc->stage == DROP_REFERENCE) { |
5033 | if (wc->refs[level] > 1) | |
5034 | return 1; | |
f82d02d9 | 5035 | |
2c47e605 YZ |
5036 | if (path->locks[level] && !wc->keep_locks) { |
5037 | btrfs_tree_unlock(eb); | |
5038 | path->locks[level] = 0; | |
5039 | } | |
5040 | return 0; | |
5041 | } | |
f82d02d9 | 5042 | |
2c47e605 YZ |
5043 | /* wc->stage == UPDATE_BACKREF */ |
5044 | if (!(wc->flags[level] & flag)) { | |
5045 | BUG_ON(!path->locks[level]); | |
5046 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
f82d02d9 | 5047 | BUG_ON(ret); |
2c47e605 YZ |
5048 | ret = btrfs_dec_ref(trans, root, eb, 0); |
5049 | BUG_ON(ret); | |
5050 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
5051 | eb->len, flag, 0); | |
5052 | BUG_ON(ret); | |
5053 | wc->flags[level] |= flag; | |
5054 | } | |
5055 | ||
5056 | /* | |
5057 | * the block is shared by multiple trees, so it's not good to | |
5058 | * keep the tree lock | |
5059 | */ | |
5060 | if (path->locks[level] && level > 0) { | |
5061 | btrfs_tree_unlock(eb); | |
5062 | path->locks[level] = 0; | |
5063 | } | |
5064 | return 0; | |
5065 | } | |
5066 | ||
1c4850e2 YZ |
5067 | /* |
5068 | * hepler to process tree block pointer. | |
5069 | * | |
5070 | * when wc->stage == DROP_REFERENCE, this function checks | |
5071 | * reference count of the block pointed to. if the block | |
5072 | * is shared and we need update back refs for the subtree | |
5073 | * rooted at the block, this function changes wc->stage to | |
5074 | * UPDATE_BACKREF. if the block is shared and there is no | |
5075 | * need to update back, this function drops the reference | |
5076 | * to the block. | |
5077 | * | |
5078 | * NOTE: return value 1 means we should stop walking down. | |
5079 | */ | |
5080 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
5081 | struct btrfs_root *root, | |
5082 | struct btrfs_path *path, | |
94fcca9f | 5083 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
5084 | { |
5085 | u64 bytenr; | |
5086 | u64 generation; | |
5087 | u64 parent; | |
5088 | u32 blocksize; | |
5089 | struct btrfs_key key; | |
5090 | struct extent_buffer *next; | |
5091 | int level = wc->level; | |
5092 | int reada = 0; | |
5093 | int ret = 0; | |
5094 | ||
5095 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
5096 | path->slots[level]); | |
5097 | /* | |
5098 | * if the lower level block was created before the snapshot | |
5099 | * was created, we know there is no need to update back refs | |
5100 | * for the subtree | |
5101 | */ | |
5102 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
5103 | generation <= root->root_key.offset) { |
5104 | *lookup_info = 1; | |
1c4850e2 | 5105 | return 1; |
94fcca9f | 5106 | } |
1c4850e2 YZ |
5107 | |
5108 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
5109 | blocksize = btrfs_level_size(root, level - 1); | |
5110 | ||
5111 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
5112 | if (!next) { | |
5113 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
5114 | reada = 1; | |
5115 | } | |
5116 | btrfs_tree_lock(next); | |
5117 | btrfs_set_lock_blocking(next); | |
5118 | ||
94fcca9f YZ |
5119 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
5120 | &wc->refs[level - 1], | |
5121 | &wc->flags[level - 1]); | |
5122 | BUG_ON(ret); | |
5123 | BUG_ON(wc->refs[level - 1] == 0); | |
5124 | *lookup_info = 0; | |
1c4850e2 | 5125 | |
94fcca9f | 5126 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 5127 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
5128 | if (level == 1 && |
5129 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5130 | goto skip; | |
5131 | ||
1c4850e2 YZ |
5132 | if (!wc->update_ref || |
5133 | generation <= root->root_key.offset) | |
5134 | goto skip; | |
5135 | ||
5136 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
5137 | path->slots[level]); | |
5138 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
5139 | if (ret < 0) | |
5140 | goto skip; | |
5141 | ||
5142 | wc->stage = UPDATE_BACKREF; | |
5143 | wc->shared_level = level - 1; | |
5144 | } | |
94fcca9f YZ |
5145 | } else { |
5146 | if (level == 1 && | |
5147 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5148 | goto skip; | |
1c4850e2 YZ |
5149 | } |
5150 | ||
5151 | if (!btrfs_buffer_uptodate(next, generation)) { | |
5152 | btrfs_tree_unlock(next); | |
5153 | free_extent_buffer(next); | |
5154 | next = NULL; | |
94fcca9f | 5155 | *lookup_info = 1; |
1c4850e2 YZ |
5156 | } |
5157 | ||
5158 | if (!next) { | |
5159 | if (reada && level == 1) | |
5160 | reada_walk_down(trans, root, wc, path); | |
5161 | next = read_tree_block(root, bytenr, blocksize, generation); | |
5162 | btrfs_tree_lock(next); | |
5163 | btrfs_set_lock_blocking(next); | |
5164 | } | |
5165 | ||
5166 | level--; | |
5167 | BUG_ON(level != btrfs_header_level(next)); | |
5168 | path->nodes[level] = next; | |
5169 | path->slots[level] = 0; | |
5170 | path->locks[level] = 1; | |
5171 | wc->level = level; | |
5172 | if (wc->level == 1) | |
5173 | wc->reada_slot = 0; | |
5174 | return 0; | |
5175 | skip: | |
5176 | wc->refs[level - 1] = 0; | |
5177 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
5178 | if (wc->stage == DROP_REFERENCE) { |
5179 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
5180 | parent = path->nodes[level]->start; | |
5181 | } else { | |
5182 | BUG_ON(root->root_key.objectid != | |
5183 | btrfs_header_owner(path->nodes[level])); | |
5184 | parent = 0; | |
5185 | } | |
1c4850e2 | 5186 | |
94fcca9f YZ |
5187 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
5188 | root->root_key.objectid, level - 1, 0); | |
5189 | BUG_ON(ret); | |
1c4850e2 | 5190 | } |
1c4850e2 YZ |
5191 | btrfs_tree_unlock(next); |
5192 | free_extent_buffer(next); | |
94fcca9f | 5193 | *lookup_info = 1; |
1c4850e2 YZ |
5194 | return 1; |
5195 | } | |
5196 | ||
2c47e605 YZ |
5197 | /* |
5198 | * hepler to process tree block while walking up the tree. | |
5199 | * | |
5200 | * when wc->stage == DROP_REFERENCE, this function drops | |
5201 | * reference count on the block. | |
5202 | * | |
5203 | * when wc->stage == UPDATE_BACKREF, this function changes | |
5204 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
5205 | * to UPDATE_BACKREF previously while processing the block. | |
5206 | * | |
5207 | * NOTE: return value 1 means we should stop walking up. | |
5208 | */ | |
5209 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
5210 | struct btrfs_root *root, | |
5211 | struct btrfs_path *path, | |
5212 | struct walk_control *wc) | |
5213 | { | |
5214 | int ret = 0; | |
5215 | int level = wc->level; | |
5216 | struct extent_buffer *eb = path->nodes[level]; | |
5217 | u64 parent = 0; | |
5218 | ||
5219 | if (wc->stage == UPDATE_BACKREF) { | |
5220 | BUG_ON(wc->shared_level < level); | |
5221 | if (level < wc->shared_level) | |
5222 | goto out; | |
5223 | ||
2c47e605 YZ |
5224 | ret = find_next_key(path, level + 1, &wc->update_progress); |
5225 | if (ret > 0) | |
5226 | wc->update_ref = 0; | |
5227 | ||
5228 | wc->stage = DROP_REFERENCE; | |
5229 | wc->shared_level = -1; | |
5230 | path->slots[level] = 0; | |
5231 | ||
5232 | /* | |
5233 | * check reference count again if the block isn't locked. | |
5234 | * we should start walking down the tree again if reference | |
5235 | * count is one. | |
5236 | */ | |
5237 | if (!path->locks[level]) { | |
5238 | BUG_ON(level == 0); | |
5239 | btrfs_tree_lock(eb); | |
5240 | btrfs_set_lock_blocking(eb); | |
5241 | path->locks[level] = 1; | |
5242 | ||
5243 | ret = btrfs_lookup_extent_info(trans, root, | |
5244 | eb->start, eb->len, | |
5245 | &wc->refs[level], | |
5246 | &wc->flags[level]); | |
f82d02d9 | 5247 | BUG_ON(ret); |
2c47e605 YZ |
5248 | BUG_ON(wc->refs[level] == 0); |
5249 | if (wc->refs[level] == 1) { | |
5250 | btrfs_tree_unlock(eb); | |
5251 | path->locks[level] = 0; | |
5252 | return 1; | |
5253 | } | |
f82d02d9 | 5254 | } |
2c47e605 | 5255 | } |
f82d02d9 | 5256 | |
2c47e605 YZ |
5257 | /* wc->stage == DROP_REFERENCE */ |
5258 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 5259 | |
2c47e605 YZ |
5260 | if (wc->refs[level] == 1) { |
5261 | if (level == 0) { | |
5262 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
5263 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
5264 | else | |
5265 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
5266 | BUG_ON(ret); | |
5267 | } | |
5268 | /* make block locked assertion in clean_tree_block happy */ | |
5269 | if (!path->locks[level] && | |
5270 | btrfs_header_generation(eb) == trans->transid) { | |
5271 | btrfs_tree_lock(eb); | |
5272 | btrfs_set_lock_blocking(eb); | |
5273 | path->locks[level] = 1; | |
5274 | } | |
5275 | clean_tree_block(trans, root, eb); | |
5276 | } | |
5277 | ||
5278 | if (eb == root->node) { | |
5279 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
5280 | parent = eb->start; | |
5281 | else | |
5282 | BUG_ON(root->root_key.objectid != | |
5283 | btrfs_header_owner(eb)); | |
5284 | } else { | |
5285 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
5286 | parent = path->nodes[level + 1]->start; | |
5287 | else | |
5288 | BUG_ON(root->root_key.objectid != | |
5289 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 5290 | } |
f82d02d9 | 5291 | |
2c47e605 YZ |
5292 | ret = btrfs_free_extent(trans, root, eb->start, eb->len, parent, |
5293 | root->root_key.objectid, level, 0); | |
f82d02d9 | 5294 | BUG_ON(ret); |
2c47e605 YZ |
5295 | out: |
5296 | wc->refs[level] = 0; | |
5297 | wc->flags[level] = 0; | |
5298 | return ret; | |
5299 | } | |
5300 | ||
5301 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
5302 | struct btrfs_root *root, | |
5303 | struct btrfs_path *path, | |
5304 | struct walk_control *wc) | |
5305 | { | |
2c47e605 | 5306 | int level = wc->level; |
94fcca9f | 5307 | int lookup_info = 1; |
2c47e605 YZ |
5308 | int ret; |
5309 | ||
5310 | while (level >= 0) { | |
1c4850e2 YZ |
5311 | if (path->slots[level] >= |
5312 | btrfs_header_nritems(path->nodes[level])) | |
5313 | break; | |
f82d02d9 | 5314 | |
94fcca9f | 5315 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
5316 | if (ret > 0) |
5317 | break; | |
5318 | ||
5319 | if (level == 0) | |
5320 | break; | |
5321 | ||
94fcca9f | 5322 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
5323 | if (ret > 0) { |
5324 | path->slots[level]++; | |
5325 | continue; | |
5326 | } | |
5327 | level = wc->level; | |
f82d02d9 | 5328 | } |
f82d02d9 YZ |
5329 | return 0; |
5330 | } | |
5331 | ||
d397712b | 5332 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 5333 | struct btrfs_root *root, |
f82d02d9 | 5334 | struct btrfs_path *path, |
2c47e605 | 5335 | struct walk_control *wc, int max_level) |
20524f02 | 5336 | { |
2c47e605 | 5337 | int level = wc->level; |
20524f02 | 5338 | int ret; |
9f3a7427 | 5339 | |
2c47e605 YZ |
5340 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
5341 | while (level < max_level && path->nodes[level]) { | |
5342 | wc->level = level; | |
5343 | if (path->slots[level] + 1 < | |
5344 | btrfs_header_nritems(path->nodes[level])) { | |
5345 | path->slots[level]++; | |
20524f02 CM |
5346 | return 0; |
5347 | } else { | |
2c47e605 YZ |
5348 | ret = walk_up_proc(trans, root, path, wc); |
5349 | if (ret > 0) | |
5350 | return 0; | |
bd56b302 | 5351 | |
2c47e605 YZ |
5352 | if (path->locks[level]) { |
5353 | btrfs_tree_unlock(path->nodes[level]); | |
5354 | path->locks[level] = 0; | |
f82d02d9 | 5355 | } |
2c47e605 YZ |
5356 | free_extent_buffer(path->nodes[level]); |
5357 | path->nodes[level] = NULL; | |
5358 | level++; | |
20524f02 CM |
5359 | } |
5360 | } | |
5361 | return 1; | |
5362 | } | |
5363 | ||
9aca1d51 | 5364 | /* |
2c47e605 YZ |
5365 | * drop a subvolume tree. |
5366 | * | |
5367 | * this function traverses the tree freeing any blocks that only | |
5368 | * referenced by the tree. | |
5369 | * | |
5370 | * when a shared tree block is found. this function decreases its | |
5371 | * reference count by one. if update_ref is true, this function | |
5372 | * also make sure backrefs for the shared block and all lower level | |
5373 | * blocks are properly updated. | |
9aca1d51 | 5374 | */ |
2c47e605 | 5375 | int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref) |
20524f02 | 5376 | { |
5caf2a00 | 5377 | struct btrfs_path *path; |
2c47e605 YZ |
5378 | struct btrfs_trans_handle *trans; |
5379 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 5380 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
5381 | struct walk_control *wc; |
5382 | struct btrfs_key key; | |
5383 | int err = 0; | |
5384 | int ret; | |
5385 | int level; | |
20524f02 | 5386 | |
5caf2a00 CM |
5387 | path = btrfs_alloc_path(); |
5388 | BUG_ON(!path); | |
20524f02 | 5389 | |
2c47e605 YZ |
5390 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
5391 | BUG_ON(!wc); | |
5392 | ||
5393 | trans = btrfs_start_transaction(tree_root, 1); | |
5394 | ||
9f3a7427 | 5395 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 5396 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
5397 | path->nodes[level] = btrfs_lock_root_node(root); |
5398 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 5399 | path->slots[level] = 0; |
5d4f98a2 | 5400 | path->locks[level] = 1; |
2c47e605 YZ |
5401 | memset(&wc->update_progress, 0, |
5402 | sizeof(wc->update_progress)); | |
9f3a7427 | 5403 | } else { |
9f3a7427 | 5404 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
5405 | memcpy(&wc->update_progress, &key, |
5406 | sizeof(wc->update_progress)); | |
5407 | ||
6702ed49 | 5408 | level = root_item->drop_level; |
2c47e605 | 5409 | BUG_ON(level == 0); |
6702ed49 | 5410 | path->lowest_level = level; |
2c47e605 YZ |
5411 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5412 | path->lowest_level = 0; | |
5413 | if (ret < 0) { | |
5414 | err = ret; | |
9f3a7427 CM |
5415 | goto out; |
5416 | } | |
1c4850e2 | 5417 | WARN_ON(ret > 0); |
2c47e605 | 5418 | |
7d9eb12c CM |
5419 | /* |
5420 | * unlock our path, this is safe because only this | |
5421 | * function is allowed to delete this snapshot | |
5422 | */ | |
5d4f98a2 | 5423 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
5424 | |
5425 | level = btrfs_header_level(root->node); | |
5426 | while (1) { | |
5427 | btrfs_tree_lock(path->nodes[level]); | |
5428 | btrfs_set_lock_blocking(path->nodes[level]); | |
5429 | ||
5430 | ret = btrfs_lookup_extent_info(trans, root, | |
5431 | path->nodes[level]->start, | |
5432 | path->nodes[level]->len, | |
5433 | &wc->refs[level], | |
5434 | &wc->flags[level]); | |
5435 | BUG_ON(ret); | |
5436 | BUG_ON(wc->refs[level] == 0); | |
5437 | ||
5438 | if (level == root_item->drop_level) | |
5439 | break; | |
5440 | ||
5441 | btrfs_tree_unlock(path->nodes[level]); | |
5442 | WARN_ON(wc->refs[level] != 1); | |
5443 | level--; | |
5444 | } | |
9f3a7427 | 5445 | } |
2c47e605 YZ |
5446 | |
5447 | wc->level = level; | |
5448 | wc->shared_level = -1; | |
5449 | wc->stage = DROP_REFERENCE; | |
5450 | wc->update_ref = update_ref; | |
5451 | wc->keep_locks = 0; | |
1c4850e2 | 5452 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 5453 | |
d397712b | 5454 | while (1) { |
2c47e605 YZ |
5455 | ret = walk_down_tree(trans, root, path, wc); |
5456 | if (ret < 0) { | |
5457 | err = ret; | |
20524f02 | 5458 | break; |
2c47e605 | 5459 | } |
9aca1d51 | 5460 | |
2c47e605 YZ |
5461 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
5462 | if (ret < 0) { | |
5463 | err = ret; | |
20524f02 | 5464 | break; |
2c47e605 YZ |
5465 | } |
5466 | ||
5467 | if (ret > 0) { | |
5468 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
5469 | break; |
5470 | } | |
2c47e605 YZ |
5471 | |
5472 | if (wc->stage == DROP_REFERENCE) { | |
5473 | level = wc->level; | |
5474 | btrfs_node_key(path->nodes[level], | |
5475 | &root_item->drop_progress, | |
5476 | path->slots[level]); | |
5477 | root_item->drop_level = level; | |
5478 | } | |
5479 | ||
5480 | BUG_ON(wc->level == 0); | |
5481 | if (trans->transaction->in_commit || | |
5482 | trans->transaction->delayed_refs.flushing) { | |
5483 | ret = btrfs_update_root(trans, tree_root, | |
5484 | &root->root_key, | |
5485 | root_item); | |
5486 | BUG_ON(ret); | |
5487 | ||
5488 | btrfs_end_transaction(trans, tree_root); | |
5489 | trans = btrfs_start_transaction(tree_root, 1); | |
5490 | } else { | |
5491 | unsigned long update; | |
c3e69d58 CM |
5492 | update = trans->delayed_ref_updates; |
5493 | trans->delayed_ref_updates = 0; | |
5494 | if (update) | |
2c47e605 YZ |
5495 | btrfs_run_delayed_refs(trans, tree_root, |
5496 | update); | |
c3e69d58 | 5497 | } |
20524f02 | 5498 | } |
2c47e605 YZ |
5499 | btrfs_release_path(root, path); |
5500 | BUG_ON(err); | |
5501 | ||
5502 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
5503 | BUG_ON(ret); | |
5504 | ||
76dda93c YZ |
5505 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
5506 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
5507 | NULL, NULL); | |
5508 | BUG_ON(ret < 0); | |
5509 | if (ret > 0) { | |
5510 | ret = btrfs_del_orphan_item(trans, tree_root, | |
5511 | root->root_key.objectid); | |
5512 | BUG_ON(ret); | |
5513 | } | |
5514 | } | |
5515 | ||
5516 | if (root->in_radix) { | |
5517 | btrfs_free_fs_root(tree_root->fs_info, root); | |
5518 | } else { | |
5519 | free_extent_buffer(root->node); | |
5520 | free_extent_buffer(root->commit_root); | |
5521 | kfree(root); | |
5522 | } | |
9f3a7427 | 5523 | out: |
2c47e605 YZ |
5524 | btrfs_end_transaction(trans, tree_root); |
5525 | kfree(wc); | |
5caf2a00 | 5526 | btrfs_free_path(path); |
2c47e605 | 5527 | return err; |
20524f02 | 5528 | } |
9078a3e1 | 5529 | |
2c47e605 YZ |
5530 | /* |
5531 | * drop subtree rooted at tree block 'node'. | |
5532 | * | |
5533 | * NOTE: this function will unlock and release tree block 'node' | |
5534 | */ | |
f82d02d9 YZ |
5535 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
5536 | struct btrfs_root *root, | |
5537 | struct extent_buffer *node, | |
5538 | struct extent_buffer *parent) | |
5539 | { | |
5540 | struct btrfs_path *path; | |
2c47e605 | 5541 | struct walk_control *wc; |
f82d02d9 YZ |
5542 | int level; |
5543 | int parent_level; | |
5544 | int ret = 0; | |
5545 | int wret; | |
5546 | ||
2c47e605 YZ |
5547 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
5548 | ||
f82d02d9 YZ |
5549 | path = btrfs_alloc_path(); |
5550 | BUG_ON(!path); | |
5551 | ||
2c47e605 YZ |
5552 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
5553 | BUG_ON(!wc); | |
5554 | ||
b9447ef8 | 5555 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
5556 | parent_level = btrfs_header_level(parent); |
5557 | extent_buffer_get(parent); | |
5558 | path->nodes[parent_level] = parent; | |
5559 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
5560 | ||
b9447ef8 | 5561 | btrfs_assert_tree_locked(node); |
f82d02d9 | 5562 | level = btrfs_header_level(node); |
f82d02d9 YZ |
5563 | path->nodes[level] = node; |
5564 | path->slots[level] = 0; | |
2c47e605 YZ |
5565 | path->locks[level] = 1; |
5566 | ||
5567 | wc->refs[parent_level] = 1; | |
5568 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
5569 | wc->level = level; | |
5570 | wc->shared_level = -1; | |
5571 | wc->stage = DROP_REFERENCE; | |
5572 | wc->update_ref = 0; | |
5573 | wc->keep_locks = 1; | |
1c4850e2 | 5574 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
5575 | |
5576 | while (1) { | |
2c47e605 YZ |
5577 | wret = walk_down_tree(trans, root, path, wc); |
5578 | if (wret < 0) { | |
f82d02d9 | 5579 | ret = wret; |
f82d02d9 | 5580 | break; |
2c47e605 | 5581 | } |
f82d02d9 | 5582 | |
2c47e605 | 5583 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
5584 | if (wret < 0) |
5585 | ret = wret; | |
5586 | if (wret != 0) | |
5587 | break; | |
5588 | } | |
5589 | ||
2c47e605 | 5590 | kfree(wc); |
f82d02d9 YZ |
5591 | btrfs_free_path(path); |
5592 | return ret; | |
5593 | } | |
5594 | ||
5d4f98a2 | 5595 | #if 0 |
8e7bf94f CM |
5596 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
5597 | unsigned long nr) | |
5598 | { | |
5599 | return min(last, start + nr - 1); | |
5600 | } | |
5601 | ||
d397712b | 5602 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
98ed5174 | 5603 | u64 len) |
edbd8d4e CM |
5604 | { |
5605 | u64 page_start; | |
5606 | u64 page_end; | |
1a40e23b | 5607 | unsigned long first_index; |
edbd8d4e | 5608 | unsigned long last_index; |
edbd8d4e CM |
5609 | unsigned long i; |
5610 | struct page *page; | |
d1310b2e | 5611 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 5612 | struct file_ra_state *ra; |
3eaa2885 | 5613 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
5614 | unsigned int total_read = 0; |
5615 | unsigned int total_dirty = 0; | |
5616 | int ret = 0; | |
4313b399 CM |
5617 | |
5618 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
5619 | |
5620 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 5621 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
5622 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
5623 | ||
1a40e23b ZY |
5624 | /* make sure the dirty trick played by the caller work */ |
5625 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
5626 | first_index, last_index); | |
5627 | if (ret) | |
5628 | goto out_unlock; | |
8e7bf94f | 5629 | |
4313b399 | 5630 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 5631 | |
1a40e23b ZY |
5632 | for (i = first_index ; i <= last_index; i++) { |
5633 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 5634 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 5635 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
5636 | } |
5637 | total_read++; | |
3eaa2885 CM |
5638 | again: |
5639 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 5640 | BUG_ON(1); |
edbd8d4e | 5641 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 5642 | if (!page) { |
1a40e23b | 5643 | ret = -ENOMEM; |
edbd8d4e | 5644 | goto out_unlock; |
a061fc8d | 5645 | } |
edbd8d4e CM |
5646 | if (!PageUptodate(page)) { |
5647 | btrfs_readpage(NULL, page); | |
5648 | lock_page(page); | |
5649 | if (!PageUptodate(page)) { | |
5650 | unlock_page(page); | |
5651 | page_cache_release(page); | |
1a40e23b | 5652 | ret = -EIO; |
edbd8d4e CM |
5653 | goto out_unlock; |
5654 | } | |
5655 | } | |
ec44a35c | 5656 | wait_on_page_writeback(page); |
3eaa2885 | 5657 | |
edbd8d4e CM |
5658 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
5659 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 5660 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 5661 | |
3eaa2885 CM |
5662 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
5663 | if (ordered) { | |
5664 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
5665 | unlock_page(page); | |
5666 | page_cache_release(page); | |
5667 | btrfs_start_ordered_extent(inode, ordered, 1); | |
5668 | btrfs_put_ordered_extent(ordered); | |
5669 | goto again; | |
5670 | } | |
5671 | set_page_extent_mapped(page); | |
5672 | ||
1a40e23b ZY |
5673 | if (i == first_index) |
5674 | set_extent_bits(io_tree, page_start, page_end, | |
5675 | EXTENT_BOUNDARY, GFP_NOFS); | |
1f80e4db | 5676 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b | 5677 | |
a061fc8d | 5678 | set_page_dirty(page); |
1a40e23b | 5679 | total_dirty++; |
edbd8d4e | 5680 | |
d1310b2e | 5681 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
5682 | unlock_page(page); |
5683 | page_cache_release(page); | |
5684 | } | |
5685 | ||
5686 | out_unlock: | |
ec44a35c | 5687 | kfree(ra); |
edbd8d4e | 5688 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
5689 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
5690 | return ret; | |
edbd8d4e CM |
5691 | } |
5692 | ||
d397712b | 5693 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
1a40e23b ZY |
5694 | struct btrfs_key *extent_key, |
5695 | u64 offset) | |
5696 | { | |
5697 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
5698 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
5699 | struct extent_map *em; | |
6643558d YZ |
5700 | u64 start = extent_key->objectid - offset; |
5701 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 5702 | |
1a40e23b ZY |
5703 | em = alloc_extent_map(GFP_NOFS); |
5704 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 5705 | |
6643558d | 5706 | em->start = start; |
1a40e23b | 5707 | em->len = extent_key->offset; |
c8b97818 | 5708 | em->block_len = extent_key->offset; |
1a40e23b ZY |
5709 | em->block_start = extent_key->objectid; |
5710 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
5711 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
5712 | ||
5713 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 5714 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
5715 | while (1) { |
5716 | int ret; | |
890871be | 5717 | write_lock(&em_tree->lock); |
1a40e23b | 5718 | ret = add_extent_mapping(em_tree, em); |
890871be | 5719 | write_unlock(&em_tree->lock); |
1a40e23b ZY |
5720 | if (ret != -EEXIST) { |
5721 | free_extent_map(em); | |
bf4ef679 CM |
5722 | break; |
5723 | } | |
6643558d | 5724 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 5725 | } |
6643558d | 5726 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 5727 | |
6643558d | 5728 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 5729 | } |
edbd8d4e | 5730 | |
1a40e23b ZY |
5731 | struct btrfs_ref_path { |
5732 | u64 extent_start; | |
5733 | u64 nodes[BTRFS_MAX_LEVEL]; | |
5734 | u64 root_objectid; | |
5735 | u64 root_generation; | |
5736 | u64 owner_objectid; | |
1a40e23b ZY |
5737 | u32 num_refs; |
5738 | int lowest_level; | |
5739 | int current_level; | |
f82d02d9 YZ |
5740 | int shared_level; |
5741 | ||
5742 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
5743 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 5744 | }; |
7d9eb12c | 5745 | |
1a40e23b | 5746 | struct disk_extent { |
c8b97818 | 5747 | u64 ram_bytes; |
1a40e23b ZY |
5748 | u64 disk_bytenr; |
5749 | u64 disk_num_bytes; | |
5750 | u64 offset; | |
5751 | u64 num_bytes; | |
c8b97818 CM |
5752 | u8 compression; |
5753 | u8 encryption; | |
5754 | u16 other_encoding; | |
1a40e23b | 5755 | }; |
4313b399 | 5756 | |
1a40e23b ZY |
5757 | static int is_cowonly_root(u64 root_objectid) |
5758 | { | |
5759 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
5760 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
5761 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
5762 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
0403e47e YZ |
5763 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
5764 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1a40e23b ZY |
5765 | return 1; |
5766 | return 0; | |
5767 | } | |
edbd8d4e | 5768 | |
d397712b | 5769 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5770 | struct btrfs_root *extent_root, |
5771 | struct btrfs_ref_path *ref_path, | |
5772 | int first_time) | |
5773 | { | |
5774 | struct extent_buffer *leaf; | |
5775 | struct btrfs_path *path; | |
5776 | struct btrfs_extent_ref *ref; | |
5777 | struct btrfs_key key; | |
5778 | struct btrfs_key found_key; | |
5779 | u64 bytenr; | |
5780 | u32 nritems; | |
5781 | int level; | |
5782 | int ret = 1; | |
edbd8d4e | 5783 | |
1a40e23b ZY |
5784 | path = btrfs_alloc_path(); |
5785 | if (!path) | |
5786 | return -ENOMEM; | |
bf4ef679 | 5787 | |
1a40e23b ZY |
5788 | if (first_time) { |
5789 | ref_path->lowest_level = -1; | |
5790 | ref_path->current_level = -1; | |
f82d02d9 | 5791 | ref_path->shared_level = -1; |
1a40e23b ZY |
5792 | goto walk_up; |
5793 | } | |
5794 | walk_down: | |
5795 | level = ref_path->current_level - 1; | |
5796 | while (level >= -1) { | |
5797 | u64 parent; | |
5798 | if (level < ref_path->lowest_level) | |
5799 | break; | |
bf4ef679 | 5800 | |
d397712b | 5801 | if (level >= 0) |
1a40e23b | 5802 | bytenr = ref_path->nodes[level]; |
d397712b | 5803 | else |
1a40e23b | 5804 | bytenr = ref_path->extent_start; |
1a40e23b | 5805 | BUG_ON(bytenr == 0); |
bf4ef679 | 5806 | |
1a40e23b ZY |
5807 | parent = ref_path->nodes[level + 1]; |
5808 | ref_path->nodes[level + 1] = 0; | |
5809 | ref_path->current_level = level; | |
5810 | BUG_ON(parent == 0); | |
0ef3e66b | 5811 | |
1a40e23b ZY |
5812 | key.objectid = bytenr; |
5813 | key.offset = parent + 1; | |
5814 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 5815 | |
1a40e23b ZY |
5816 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
5817 | if (ret < 0) | |
edbd8d4e | 5818 | goto out; |
1a40e23b | 5819 | BUG_ON(ret == 0); |
7d9eb12c | 5820 | |
1a40e23b ZY |
5821 | leaf = path->nodes[0]; |
5822 | nritems = btrfs_header_nritems(leaf); | |
5823 | if (path->slots[0] >= nritems) { | |
5824 | ret = btrfs_next_leaf(extent_root, path); | |
5825 | if (ret < 0) | |
5826 | goto out; | |
5827 | if (ret > 0) | |
5828 | goto next; | |
5829 | leaf = path->nodes[0]; | |
5830 | } | |
0ef3e66b | 5831 | |
1a40e23b ZY |
5832 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5833 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
5834 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
5835 | if (level < ref_path->shared_level) | |
5836 | ref_path->shared_level = level; | |
1a40e23b | 5837 | goto found; |
f82d02d9 | 5838 | } |
1a40e23b ZY |
5839 | next: |
5840 | level--; | |
5841 | btrfs_release_path(extent_root, path); | |
d899e052 | 5842 | cond_resched(); |
1a40e23b ZY |
5843 | } |
5844 | /* reached lowest level */ | |
5845 | ret = 1; | |
5846 | goto out; | |
5847 | walk_up: | |
5848 | level = ref_path->current_level; | |
5849 | while (level < BTRFS_MAX_LEVEL - 1) { | |
5850 | u64 ref_objectid; | |
d397712b CM |
5851 | |
5852 | if (level >= 0) | |
1a40e23b | 5853 | bytenr = ref_path->nodes[level]; |
d397712b | 5854 | else |
1a40e23b | 5855 | bytenr = ref_path->extent_start; |
d397712b | 5856 | |
1a40e23b | 5857 | BUG_ON(bytenr == 0); |
edbd8d4e | 5858 | |
1a40e23b ZY |
5859 | key.objectid = bytenr; |
5860 | key.offset = 0; | |
5861 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 5862 | |
1a40e23b ZY |
5863 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
5864 | if (ret < 0) | |
5865 | goto out; | |
edbd8d4e | 5866 | |
1a40e23b ZY |
5867 | leaf = path->nodes[0]; |
5868 | nritems = btrfs_header_nritems(leaf); | |
5869 | if (path->slots[0] >= nritems) { | |
5870 | ret = btrfs_next_leaf(extent_root, path); | |
5871 | if (ret < 0) | |
5872 | goto out; | |
5873 | if (ret > 0) { | |
5874 | /* the extent was freed by someone */ | |
5875 | if (ref_path->lowest_level == level) | |
5876 | goto out; | |
5877 | btrfs_release_path(extent_root, path); | |
5878 | goto walk_down; | |
5879 | } | |
5880 | leaf = path->nodes[0]; | |
5881 | } | |
edbd8d4e | 5882 | |
1a40e23b ZY |
5883 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5884 | if (found_key.objectid != bytenr || | |
5885 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
5886 | /* the extent was freed by someone */ | |
5887 | if (ref_path->lowest_level == level) { | |
5888 | ret = 1; | |
5889 | goto out; | |
5890 | } | |
5891 | btrfs_release_path(extent_root, path); | |
5892 | goto walk_down; | |
5893 | } | |
5894 | found: | |
5895 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
5896 | struct btrfs_extent_ref); | |
5897 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
5898 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
5899 | if (first_time) { | |
5900 | level = (int)ref_objectid; | |
5901 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
5902 | ref_path->lowest_level = level; | |
5903 | ref_path->current_level = level; | |
5904 | ref_path->nodes[level] = bytenr; | |
5905 | } else { | |
5906 | WARN_ON(ref_objectid != level); | |
5907 | } | |
5908 | } else { | |
5909 | WARN_ON(level != -1); | |
5910 | } | |
5911 | first_time = 0; | |
bf4ef679 | 5912 | |
1a40e23b ZY |
5913 | if (ref_path->lowest_level == level) { |
5914 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
5915 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
5916 | } | |
bf4ef679 | 5917 | |
7d9eb12c | 5918 | /* |
1a40e23b ZY |
5919 | * the block is tree root or the block isn't in reference |
5920 | * counted tree. | |
7d9eb12c | 5921 | */ |
1a40e23b ZY |
5922 | if (found_key.objectid == found_key.offset || |
5923 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
5924 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
5925 | ref_path->root_generation = | |
5926 | btrfs_ref_generation(leaf, ref); | |
5927 | if (level < 0) { | |
5928 | /* special reference from the tree log */ | |
5929 | ref_path->nodes[0] = found_key.offset; | |
5930 | ref_path->current_level = 0; | |
5931 | } | |
5932 | ret = 0; | |
5933 | goto out; | |
5934 | } | |
7d9eb12c | 5935 | |
1a40e23b ZY |
5936 | level++; |
5937 | BUG_ON(ref_path->nodes[level] != 0); | |
5938 | ref_path->nodes[level] = found_key.offset; | |
5939 | ref_path->current_level = level; | |
bf4ef679 | 5940 | |
1a40e23b ZY |
5941 | /* |
5942 | * the reference was created in the running transaction, | |
5943 | * no need to continue walking up. | |
5944 | */ | |
5945 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
5946 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
5947 | ref_path->root_generation = | |
5948 | btrfs_ref_generation(leaf, ref); | |
5949 | ret = 0; | |
5950 | goto out; | |
7d9eb12c CM |
5951 | } |
5952 | ||
1a40e23b | 5953 | btrfs_release_path(extent_root, path); |
d899e052 | 5954 | cond_resched(); |
7d9eb12c | 5955 | } |
1a40e23b ZY |
5956 | /* reached max tree level, but no tree root found. */ |
5957 | BUG(); | |
edbd8d4e | 5958 | out: |
1a40e23b ZY |
5959 | btrfs_free_path(path); |
5960 | return ret; | |
edbd8d4e CM |
5961 | } |
5962 | ||
1a40e23b ZY |
5963 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
5964 | struct btrfs_root *extent_root, | |
5965 | struct btrfs_ref_path *ref_path, | |
5966 | u64 extent_start) | |
a061fc8d | 5967 | { |
1a40e23b ZY |
5968 | memset(ref_path, 0, sizeof(*ref_path)); |
5969 | ref_path->extent_start = extent_start; | |
a061fc8d | 5970 | |
1a40e23b | 5971 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
5972 | } |
5973 | ||
1a40e23b ZY |
5974 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
5975 | struct btrfs_root *extent_root, | |
5976 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 5977 | { |
1a40e23b ZY |
5978 | return __next_ref_path(trans, extent_root, ref_path, 0); |
5979 | } | |
5980 | ||
d397712b | 5981 | static noinline int get_new_locations(struct inode *reloc_inode, |
1a40e23b ZY |
5982 | struct btrfs_key *extent_key, |
5983 | u64 offset, int no_fragment, | |
5984 | struct disk_extent **extents, | |
5985 | int *nr_extents) | |
5986 | { | |
5987 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
5988 | struct btrfs_path *path; | |
5989 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 5990 | struct extent_buffer *leaf; |
1a40e23b ZY |
5991 | struct disk_extent *exts = *extents; |
5992 | struct btrfs_key found_key; | |
5993 | u64 cur_pos; | |
5994 | u64 last_byte; | |
edbd8d4e | 5995 | u32 nritems; |
1a40e23b ZY |
5996 | int nr = 0; |
5997 | int max = *nr_extents; | |
5998 | int ret; | |
edbd8d4e | 5999 | |
1a40e23b ZY |
6000 | WARN_ON(!no_fragment && *extents); |
6001 | if (!exts) { | |
6002 | max = 1; | |
6003 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
6004 | if (!exts) | |
6005 | return -ENOMEM; | |
a061fc8d | 6006 | } |
edbd8d4e | 6007 | |
1a40e23b ZY |
6008 | path = btrfs_alloc_path(); |
6009 | BUG_ON(!path); | |
edbd8d4e | 6010 | |
1a40e23b ZY |
6011 | cur_pos = extent_key->objectid - offset; |
6012 | last_byte = extent_key->objectid + extent_key->offset; | |
6013 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
6014 | cur_pos, 0); | |
6015 | if (ret < 0) | |
6016 | goto out; | |
6017 | if (ret > 0) { | |
6018 | ret = -ENOENT; | |
6019 | goto out; | |
6020 | } | |
edbd8d4e | 6021 | |
1a40e23b | 6022 | while (1) { |
edbd8d4e CM |
6023 | leaf = path->nodes[0]; |
6024 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
6025 | if (path->slots[0] >= nritems) { |
6026 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
6027 | if (ret < 0) |
6028 | goto out; | |
1a40e23b ZY |
6029 | if (ret > 0) |
6030 | break; | |
bf4ef679 | 6031 | leaf = path->nodes[0]; |
a061fc8d | 6032 | } |
edbd8d4e CM |
6033 | |
6034 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
6035 | if (found_key.offset != cur_pos || |
6036 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
6037 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
6038 | break; |
6039 | ||
1a40e23b ZY |
6040 | fi = btrfs_item_ptr(leaf, path->slots[0], |
6041 | struct btrfs_file_extent_item); | |
6042 | if (btrfs_file_extent_type(leaf, fi) != | |
6043 | BTRFS_FILE_EXTENT_REG || | |
6044 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 6045 | break; |
1a40e23b ZY |
6046 | |
6047 | if (nr == max) { | |
6048 | struct disk_extent *old = exts; | |
6049 | max *= 2; | |
6050 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
6051 | memcpy(exts, old, sizeof(*exts) * nr); | |
6052 | if (old != *extents) | |
6053 | kfree(old); | |
a061fc8d | 6054 | } |
edbd8d4e | 6055 | |
1a40e23b ZY |
6056 | exts[nr].disk_bytenr = |
6057 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
6058 | exts[nr].disk_num_bytes = | |
6059 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
6060 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
6061 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
6062 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
6063 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
6064 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
6065 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
6066 | fi); | |
d899e052 YZ |
6067 | BUG_ON(exts[nr].offset > 0); |
6068 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
6069 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 6070 | |
1a40e23b ZY |
6071 | cur_pos += exts[nr].num_bytes; |
6072 | nr++; | |
6073 | ||
6074 | if (cur_pos + offset >= last_byte) | |
6075 | break; | |
6076 | ||
6077 | if (no_fragment) { | |
6078 | ret = 1; | |
edbd8d4e | 6079 | goto out; |
1a40e23b ZY |
6080 | } |
6081 | path->slots[0]++; | |
6082 | } | |
6083 | ||
1f80e4db | 6084 | BUG_ON(cur_pos + offset > last_byte); |
1a40e23b ZY |
6085 | if (cur_pos + offset < last_byte) { |
6086 | ret = -ENOENT; | |
6087 | goto out; | |
edbd8d4e CM |
6088 | } |
6089 | ret = 0; | |
6090 | out: | |
1a40e23b ZY |
6091 | btrfs_free_path(path); |
6092 | if (ret) { | |
6093 | if (exts != *extents) | |
6094 | kfree(exts); | |
6095 | } else { | |
6096 | *extents = exts; | |
6097 | *nr_extents = nr; | |
6098 | } | |
6099 | return ret; | |
6100 | } | |
6101 | ||
d397712b | 6102 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6103 | struct btrfs_root *root, |
6104 | struct btrfs_path *path, | |
6105 | struct btrfs_key *extent_key, | |
6106 | struct btrfs_key *leaf_key, | |
6107 | struct btrfs_ref_path *ref_path, | |
6108 | struct disk_extent *new_extents, | |
6109 | int nr_extents) | |
6110 | { | |
6111 | struct extent_buffer *leaf; | |
6112 | struct btrfs_file_extent_item *fi; | |
6113 | struct inode *inode = NULL; | |
6114 | struct btrfs_key key; | |
6115 | u64 lock_start = 0; | |
6116 | u64 lock_end = 0; | |
6117 | u64 num_bytes; | |
6118 | u64 ext_offset; | |
86288a19 | 6119 | u64 search_end = (u64)-1; |
1a40e23b | 6120 | u32 nritems; |
3bb1a1bc | 6121 | int nr_scaned = 0; |
1a40e23b | 6122 | int extent_locked = 0; |
d899e052 | 6123 | int extent_type; |
1a40e23b ZY |
6124 | int ret; |
6125 | ||
3bb1a1bc | 6126 | memcpy(&key, leaf_key, sizeof(key)); |
1a40e23b | 6127 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
6128 | if (key.objectid < ref_path->owner_objectid || |
6129 | (key.objectid == ref_path->owner_objectid && | |
6130 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
6131 | key.objectid = ref_path->owner_objectid; | |
6132 | key.type = BTRFS_EXTENT_DATA_KEY; | |
6133 | key.offset = 0; | |
6134 | } | |
1a40e23b ZY |
6135 | } |
6136 | ||
6137 | while (1) { | |
6138 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
6139 | if (ret < 0) | |
6140 | goto out; | |
6141 | ||
6142 | leaf = path->nodes[0]; | |
6143 | nritems = btrfs_header_nritems(leaf); | |
6144 | next: | |
6145 | if (extent_locked && ret > 0) { | |
6146 | /* | |
6147 | * the file extent item was modified by someone | |
6148 | * before the extent got locked. | |
6149 | */ | |
1a40e23b ZY |
6150 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6151 | lock_end, GFP_NOFS); | |
6152 | extent_locked = 0; | |
6153 | } | |
6154 | ||
6155 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 6156 | if (++nr_scaned > 2) |
1a40e23b ZY |
6157 | break; |
6158 | ||
6159 | BUG_ON(extent_locked); | |
6160 | ret = btrfs_next_leaf(root, path); | |
6161 | if (ret < 0) | |
6162 | goto out; | |
6163 | if (ret > 0) | |
6164 | break; | |
6165 | leaf = path->nodes[0]; | |
6166 | nritems = btrfs_header_nritems(leaf); | |
6167 | } | |
6168 | ||
6169 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
6170 | ||
6171 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
6172 | if ((key.objectid > ref_path->owner_objectid) || | |
6173 | (key.objectid == ref_path->owner_objectid && | |
6174 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
86288a19 | 6175 | key.offset >= search_end) |
1a40e23b ZY |
6176 | break; |
6177 | } | |
6178 | ||
6179 | if (inode && key.objectid != inode->i_ino) { | |
6180 | BUG_ON(extent_locked); | |
6181 | btrfs_release_path(root, path); | |
6182 | mutex_unlock(&inode->i_mutex); | |
6183 | iput(inode); | |
6184 | inode = NULL; | |
6185 | continue; | |
6186 | } | |
6187 | ||
6188 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
6189 | path->slots[0]++; | |
6190 | ret = 1; | |
6191 | goto next; | |
6192 | } | |
6193 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
6194 | struct btrfs_file_extent_item); | |
d899e052 YZ |
6195 | extent_type = btrfs_file_extent_type(leaf, fi); |
6196 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
6197 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
6198 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
6199 | extent_key->objectid)) { | |
6200 | path->slots[0]++; | |
6201 | ret = 1; | |
6202 | goto next; | |
6203 | } | |
6204 | ||
6205 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
6206 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
6207 | ||
86288a19 YZ |
6208 | if (search_end == (u64)-1) { |
6209 | search_end = key.offset - ext_offset + | |
6210 | btrfs_file_extent_ram_bytes(leaf, fi); | |
6211 | } | |
1a40e23b ZY |
6212 | |
6213 | if (!extent_locked) { | |
6214 | lock_start = key.offset; | |
6215 | lock_end = lock_start + num_bytes - 1; | |
6216 | } else { | |
6643558d YZ |
6217 | if (lock_start > key.offset || |
6218 | lock_end + 1 < key.offset + num_bytes) { | |
6219 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
6220 | lock_start, lock_end, GFP_NOFS); | |
6221 | extent_locked = 0; | |
6222 | } | |
1a40e23b ZY |
6223 | } |
6224 | ||
6225 | if (!inode) { | |
6226 | btrfs_release_path(root, path); | |
6227 | ||
6228 | inode = btrfs_iget_locked(root->fs_info->sb, | |
6229 | key.objectid, root); | |
6230 | if (inode->i_state & I_NEW) { | |
6231 | BTRFS_I(inode)->root = root; | |
6232 | BTRFS_I(inode)->location.objectid = | |
6233 | key.objectid; | |
6234 | BTRFS_I(inode)->location.type = | |
6235 | BTRFS_INODE_ITEM_KEY; | |
6236 | BTRFS_I(inode)->location.offset = 0; | |
6237 | btrfs_read_locked_inode(inode); | |
6238 | unlock_new_inode(inode); | |
6239 | } | |
6240 | /* | |
6241 | * some code call btrfs_commit_transaction while | |
6242 | * holding the i_mutex, so we can't use mutex_lock | |
6243 | * here. | |
6244 | */ | |
6245 | if (is_bad_inode(inode) || | |
6246 | !mutex_trylock(&inode->i_mutex)) { | |
6247 | iput(inode); | |
6248 | inode = NULL; | |
6249 | key.offset = (u64)-1; | |
6250 | goto skip; | |
6251 | } | |
6252 | } | |
6253 | ||
6254 | if (!extent_locked) { | |
6255 | struct btrfs_ordered_extent *ordered; | |
6256 | ||
6257 | btrfs_release_path(root, path); | |
6258 | ||
6259 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
6260 | lock_end, GFP_NOFS); | |
6261 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
6262 | lock_end); | |
6263 | if (ordered && | |
6264 | ordered->file_offset <= lock_end && | |
6265 | ordered->file_offset + ordered->len > lock_start) { | |
6266 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
6267 | lock_start, lock_end, GFP_NOFS); | |
6268 | btrfs_start_ordered_extent(inode, ordered, 1); | |
6269 | btrfs_put_ordered_extent(ordered); | |
6270 | key.offset += num_bytes; | |
6271 | goto skip; | |
6272 | } | |
6273 | if (ordered) | |
6274 | btrfs_put_ordered_extent(ordered); | |
6275 | ||
1a40e23b ZY |
6276 | extent_locked = 1; |
6277 | continue; | |
6278 | } | |
6279 | ||
6280 | if (nr_extents == 1) { | |
6281 | /* update extent pointer in place */ | |
1a40e23b ZY |
6282 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
6283 | new_extents[0].disk_bytenr); | |
6284 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
6285 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
6286 | btrfs_mark_buffer_dirty(leaf); |
6287 | ||
6288 | btrfs_drop_extent_cache(inode, key.offset, | |
6289 | key.offset + num_bytes - 1, 0); | |
6290 | ||
6291 | ret = btrfs_inc_extent_ref(trans, root, | |
6292 | new_extents[0].disk_bytenr, | |
6293 | new_extents[0].disk_num_bytes, | |
6294 | leaf->start, | |
6295 | root->root_key.objectid, | |
6296 | trans->transid, | |
3bb1a1bc | 6297 | key.objectid); |
1a40e23b ZY |
6298 | BUG_ON(ret); |
6299 | ||
6300 | ret = btrfs_free_extent(trans, root, | |
6301 | extent_key->objectid, | |
6302 | extent_key->offset, | |
6303 | leaf->start, | |
6304 | btrfs_header_owner(leaf), | |
6305 | btrfs_header_generation(leaf), | |
3bb1a1bc | 6306 | key.objectid, 0); |
1a40e23b ZY |
6307 | BUG_ON(ret); |
6308 | ||
6309 | btrfs_release_path(root, path); | |
6310 | key.offset += num_bytes; | |
6311 | } else { | |
d899e052 YZ |
6312 | BUG_ON(1); |
6313 | #if 0 | |
1a40e23b ZY |
6314 | u64 alloc_hint; |
6315 | u64 extent_len; | |
6316 | int i; | |
6317 | /* | |
6318 | * drop old extent pointer at first, then insert the | |
6319 | * new pointers one bye one | |
6320 | */ | |
6321 | btrfs_release_path(root, path); | |
6322 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
6323 | key.offset + num_bytes, | |
6324 | key.offset, &alloc_hint); | |
6325 | BUG_ON(ret); | |
6326 | ||
6327 | for (i = 0; i < nr_extents; i++) { | |
6328 | if (ext_offset >= new_extents[i].num_bytes) { | |
6329 | ext_offset -= new_extents[i].num_bytes; | |
6330 | continue; | |
6331 | } | |
6332 | extent_len = min(new_extents[i].num_bytes - | |
6333 | ext_offset, num_bytes); | |
6334 | ||
6335 | ret = btrfs_insert_empty_item(trans, root, | |
6336 | path, &key, | |
6337 | sizeof(*fi)); | |
6338 | BUG_ON(ret); | |
6339 | ||
6340 | leaf = path->nodes[0]; | |
6341 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
6342 | struct btrfs_file_extent_item); | |
6343 | btrfs_set_file_extent_generation(leaf, fi, | |
6344 | trans->transid); | |
6345 | btrfs_set_file_extent_type(leaf, fi, | |
6346 | BTRFS_FILE_EXTENT_REG); | |
6347 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
6348 | new_extents[i].disk_bytenr); | |
6349 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
6350 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
6351 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
6352 | new_extents[i].ram_bytes); | |
6353 | ||
6354 | btrfs_set_file_extent_compression(leaf, fi, | |
6355 | new_extents[i].compression); | |
6356 | btrfs_set_file_extent_encryption(leaf, fi, | |
6357 | new_extents[i].encryption); | |
6358 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
6359 | new_extents[i].other_encoding); | |
6360 | ||
1a40e23b ZY |
6361 | btrfs_set_file_extent_num_bytes(leaf, fi, |
6362 | extent_len); | |
6363 | ext_offset += new_extents[i].offset; | |
6364 | btrfs_set_file_extent_offset(leaf, fi, | |
6365 | ext_offset); | |
6366 | btrfs_mark_buffer_dirty(leaf); | |
6367 | ||
6368 | btrfs_drop_extent_cache(inode, key.offset, | |
6369 | key.offset + extent_len - 1, 0); | |
6370 | ||
6371 | ret = btrfs_inc_extent_ref(trans, root, | |
6372 | new_extents[i].disk_bytenr, | |
6373 | new_extents[i].disk_num_bytes, | |
6374 | leaf->start, | |
6375 | root->root_key.objectid, | |
3bb1a1bc | 6376 | trans->transid, key.objectid); |
1a40e23b ZY |
6377 | BUG_ON(ret); |
6378 | btrfs_release_path(root, path); | |
6379 | ||
a76a3cd4 | 6380 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
6381 | |
6382 | ext_offset = 0; | |
6383 | num_bytes -= extent_len; | |
6384 | key.offset += extent_len; | |
6385 | ||
6386 | if (num_bytes == 0) | |
6387 | break; | |
6388 | } | |
6389 | BUG_ON(i >= nr_extents); | |
d899e052 | 6390 | #endif |
1a40e23b ZY |
6391 | } |
6392 | ||
6393 | if (extent_locked) { | |
1a40e23b ZY |
6394 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6395 | lock_end, GFP_NOFS); | |
6396 | extent_locked = 0; | |
6397 | } | |
6398 | skip: | |
6399 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
86288a19 | 6400 | key.offset >= search_end) |
1a40e23b ZY |
6401 | break; |
6402 | ||
6403 | cond_resched(); | |
6404 | } | |
6405 | ret = 0; | |
6406 | out: | |
6407 | btrfs_release_path(root, path); | |
6408 | if (inode) { | |
6409 | mutex_unlock(&inode->i_mutex); | |
6410 | if (extent_locked) { | |
1a40e23b ZY |
6411 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6412 | lock_end, GFP_NOFS); | |
6413 | } | |
6414 | iput(inode); | |
6415 | } | |
6416 | return ret; | |
6417 | } | |
6418 | ||
1a40e23b ZY |
6419 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
6420 | struct btrfs_root *root, | |
6421 | struct extent_buffer *buf, u64 orig_start) | |
6422 | { | |
6423 | int level; | |
6424 | int ret; | |
6425 | ||
6426 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
6427 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
6428 | ||
6429 | level = btrfs_header_level(buf); | |
6430 | if (level == 0) { | |
6431 | struct btrfs_leaf_ref *ref; | |
6432 | struct btrfs_leaf_ref *orig_ref; | |
6433 | ||
6434 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
6435 | if (!orig_ref) | |
6436 | return -ENOENT; | |
6437 | ||
6438 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
6439 | if (!ref) { | |
6440 | btrfs_free_leaf_ref(root, orig_ref); | |
6441 | return -ENOMEM; | |
6442 | } | |
6443 | ||
6444 | ref->nritems = orig_ref->nritems; | |
6445 | memcpy(ref->extents, orig_ref->extents, | |
6446 | sizeof(ref->extents[0]) * ref->nritems); | |
6447 | ||
6448 | btrfs_free_leaf_ref(root, orig_ref); | |
6449 | ||
6450 | ref->root_gen = trans->transid; | |
6451 | ref->bytenr = buf->start; | |
6452 | ref->owner = btrfs_header_owner(buf); | |
6453 | ref->generation = btrfs_header_generation(buf); | |
bd56b302 | 6454 | |
1a40e23b ZY |
6455 | ret = btrfs_add_leaf_ref(root, ref, 0); |
6456 | WARN_ON(ret); | |
6457 | btrfs_free_leaf_ref(root, ref); | |
6458 | } | |
6459 | return 0; | |
6460 | } | |
6461 | ||
d397712b | 6462 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
1a40e23b ZY |
6463 | struct extent_buffer *leaf, |
6464 | struct btrfs_block_group_cache *group, | |
6465 | struct btrfs_root *target_root) | |
6466 | { | |
6467 | struct btrfs_key key; | |
6468 | struct inode *inode = NULL; | |
6469 | struct btrfs_file_extent_item *fi; | |
6470 | u64 num_bytes; | |
6471 | u64 skip_objectid = 0; | |
6472 | u32 nritems; | |
6473 | u32 i; | |
6474 | ||
6475 | nritems = btrfs_header_nritems(leaf); | |
6476 | for (i = 0; i < nritems; i++) { | |
6477 | btrfs_item_key_to_cpu(leaf, &key, i); | |
6478 | if (key.objectid == skip_objectid || | |
6479 | key.type != BTRFS_EXTENT_DATA_KEY) | |
6480 | continue; | |
6481 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
6482 | if (btrfs_file_extent_type(leaf, fi) == | |
6483 | BTRFS_FILE_EXTENT_INLINE) | |
6484 | continue; | |
6485 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
6486 | continue; | |
6487 | if (!inode || inode->i_ino != key.objectid) { | |
6488 | iput(inode); | |
6489 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
6490 | key.objectid, target_root, 1); | |
6491 | } | |
6492 | if (!inode) { | |
6493 | skip_objectid = key.objectid; | |
6494 | continue; | |
6495 | } | |
6496 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
6497 | ||
6498 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, | |
6499 | key.offset + num_bytes - 1, GFP_NOFS); | |
1a40e23b ZY |
6500 | btrfs_drop_extent_cache(inode, key.offset, |
6501 | key.offset + num_bytes - 1, 1); | |
1a40e23b ZY |
6502 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
6503 | key.offset + num_bytes - 1, GFP_NOFS); | |
6504 | cond_resched(); | |
6505 | } | |
6506 | iput(inode); | |
6507 | return 0; | |
6508 | } | |
6509 | ||
d397712b | 6510 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6511 | struct btrfs_root *root, |
6512 | struct extent_buffer *leaf, | |
6513 | struct btrfs_block_group_cache *group, | |
6514 | struct inode *reloc_inode) | |
6515 | { | |
6516 | struct btrfs_key key; | |
6517 | struct btrfs_key extent_key; | |
6518 | struct btrfs_file_extent_item *fi; | |
6519 | struct btrfs_leaf_ref *ref; | |
6520 | struct disk_extent *new_extent; | |
6521 | u64 bytenr; | |
6522 | u64 num_bytes; | |
6523 | u32 nritems; | |
6524 | u32 i; | |
6525 | int ext_index; | |
6526 | int nr_extent; | |
6527 | int ret; | |
6528 | ||
6529 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
6530 | BUG_ON(!new_extent); | |
6531 | ||
6532 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
6533 | BUG_ON(!ref); | |
6534 | ||
6535 | ext_index = -1; | |
6536 | nritems = btrfs_header_nritems(leaf); | |
6537 | for (i = 0; i < nritems; i++) { | |
6538 | btrfs_item_key_to_cpu(leaf, &key, i); | |
6539 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6540 | continue; | |
6541 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
6542 | if (btrfs_file_extent_type(leaf, fi) == | |
6543 | BTRFS_FILE_EXTENT_INLINE) | |
6544 | continue; | |
6545 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
6546 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
6547 | if (bytenr == 0) | |
6548 | continue; | |
6549 | ||
6550 | ext_index++; | |
6551 | if (bytenr >= group->key.objectid + group->key.offset || | |
6552 | bytenr + num_bytes <= group->key.objectid) | |
6553 | continue; | |
6554 | ||
6555 | extent_key.objectid = bytenr; | |
6556 | extent_key.offset = num_bytes; | |
6557 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
6558 | nr_extent = 1; | |
6559 | ret = get_new_locations(reloc_inode, &extent_key, | |
6560 | group->key.objectid, 1, | |
6561 | &new_extent, &nr_extent); | |
6562 | if (ret > 0) | |
6563 | continue; | |
6564 | BUG_ON(ret < 0); | |
6565 | ||
6566 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
6567 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
6568 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
6569 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
6570 | ||
1a40e23b ZY |
6571 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
6572 | new_extent->disk_bytenr); | |
6573 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
6574 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
6575 | btrfs_mark_buffer_dirty(leaf); |
6576 | ||
6577 | ret = btrfs_inc_extent_ref(trans, root, | |
6578 | new_extent->disk_bytenr, | |
6579 | new_extent->disk_num_bytes, | |
6580 | leaf->start, | |
6581 | root->root_key.objectid, | |
3bb1a1bc | 6582 | trans->transid, key.objectid); |
1a40e23b | 6583 | BUG_ON(ret); |
56bec294 | 6584 | |
1a40e23b ZY |
6585 | ret = btrfs_free_extent(trans, root, |
6586 | bytenr, num_bytes, leaf->start, | |
6587 | btrfs_header_owner(leaf), | |
6588 | btrfs_header_generation(leaf), | |
3bb1a1bc | 6589 | key.objectid, 0); |
1a40e23b ZY |
6590 | BUG_ON(ret); |
6591 | cond_resched(); | |
6592 | } | |
6593 | kfree(new_extent); | |
6594 | BUG_ON(ext_index + 1 != ref->nritems); | |
6595 | btrfs_free_leaf_ref(root, ref); | |
6596 | return 0; | |
6597 | } | |
6598 | ||
f82d02d9 YZ |
6599 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
6600 | struct btrfs_root *root) | |
1a40e23b ZY |
6601 | { |
6602 | struct btrfs_root *reloc_root; | |
f82d02d9 | 6603 | int ret; |
1a40e23b ZY |
6604 | |
6605 | if (root->reloc_root) { | |
6606 | reloc_root = root->reloc_root; | |
6607 | root->reloc_root = NULL; | |
6608 | list_add(&reloc_root->dead_list, | |
6609 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
6610 | |
6611 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
6612 | reloc_root->node->start); | |
6613 | btrfs_set_root_level(&root->root_item, | |
6614 | btrfs_header_level(reloc_root->node)); | |
6615 | memset(&reloc_root->root_item.drop_progress, 0, | |
6616 | sizeof(struct btrfs_disk_key)); | |
6617 | reloc_root->root_item.drop_level = 0; | |
6618 | ||
6619 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
6620 | &reloc_root->root_key, | |
6621 | &reloc_root->root_item); | |
6622 | BUG_ON(ret); | |
1a40e23b ZY |
6623 | } |
6624 | return 0; | |
6625 | } | |
6626 | ||
6627 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
6628 | { | |
6629 | struct btrfs_trans_handle *trans; | |
6630 | struct btrfs_root *reloc_root; | |
6631 | struct btrfs_root *prev_root = NULL; | |
6632 | struct list_head dead_roots; | |
6633 | int ret; | |
6634 | unsigned long nr; | |
6635 | ||
6636 | INIT_LIST_HEAD(&dead_roots); | |
6637 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
6638 | ||
6639 | while (!list_empty(&dead_roots)) { | |
6640 | reloc_root = list_entry(dead_roots.prev, | |
6641 | struct btrfs_root, dead_list); | |
6642 | list_del_init(&reloc_root->dead_list); | |
6643 | ||
6644 | BUG_ON(reloc_root->commit_root != NULL); | |
6645 | while (1) { | |
6646 | trans = btrfs_join_transaction(root, 1); | |
6647 | BUG_ON(!trans); | |
6648 | ||
6649 | mutex_lock(&root->fs_info->drop_mutex); | |
6650 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
6651 | if (ret != -EAGAIN) | |
6652 | break; | |
6653 | mutex_unlock(&root->fs_info->drop_mutex); | |
6654 | ||
6655 | nr = trans->blocks_used; | |
6656 | ret = btrfs_end_transaction(trans, root); | |
6657 | BUG_ON(ret); | |
6658 | btrfs_btree_balance_dirty(root, nr); | |
6659 | } | |
6660 | ||
6661 | free_extent_buffer(reloc_root->node); | |
6662 | ||
6663 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
6664 | &reloc_root->root_key); | |
6665 | BUG_ON(ret); | |
6666 | mutex_unlock(&root->fs_info->drop_mutex); | |
6667 | ||
6668 | nr = trans->blocks_used; | |
6669 | ret = btrfs_end_transaction(trans, root); | |
6670 | BUG_ON(ret); | |
6671 | btrfs_btree_balance_dirty(root, nr); | |
6672 | ||
6673 | kfree(prev_root); | |
6674 | prev_root = reloc_root; | |
6675 | } | |
6676 | if (prev_root) { | |
6677 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
6678 | kfree(prev_root); | |
6679 | } | |
6680 | return 0; | |
6681 | } | |
6682 | ||
6683 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
6684 | { | |
6685 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
6686 | return 0; | |
6687 | } | |
6688 | ||
6689 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
6690 | { | |
6691 | struct btrfs_root *reloc_root; | |
6692 | struct btrfs_trans_handle *trans; | |
6693 | struct btrfs_key location; | |
6694 | int found; | |
6695 | int ret; | |
6696 | ||
6697 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
6698 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
6699 | BUG_ON(ret); | |
6700 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
6701 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
6702 | ||
6703 | if (found) { | |
6704 | trans = btrfs_start_transaction(root, 1); | |
6705 | BUG_ON(!trans); | |
6706 | ret = btrfs_commit_transaction(trans, root); | |
6707 | BUG_ON(ret); | |
6708 | } | |
6709 | ||
6710 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
6711 | location.offset = (u64)-1; | |
6712 | location.type = BTRFS_ROOT_ITEM_KEY; | |
6713 | ||
6714 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
6715 | BUG_ON(!reloc_root); | |
6716 | btrfs_orphan_cleanup(reloc_root); | |
6717 | return 0; | |
6718 | } | |
6719 | ||
d397712b | 6720 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6721 | struct btrfs_root *root) |
6722 | { | |
6723 | struct btrfs_root *reloc_root; | |
6724 | struct extent_buffer *eb; | |
6725 | struct btrfs_root_item *root_item; | |
6726 | struct btrfs_key root_key; | |
6727 | int ret; | |
6728 | ||
6729 | BUG_ON(!root->ref_cows); | |
6730 | if (root->reloc_root) | |
6731 | return 0; | |
6732 | ||
6733 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
6734 | BUG_ON(!root_item); | |
6735 | ||
6736 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
6737 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
6738 | BUG_ON(ret); | |
6739 | ||
6740 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
6741 | root_key.offset = root->root_key.objectid; | |
6742 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
6743 | ||
6744 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
6745 | btrfs_set_root_refs(root_item, 0); | |
6746 | btrfs_set_root_bytenr(root_item, eb->start); | |
6747 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 6748 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
6749 | |
6750 | btrfs_tree_unlock(eb); | |
6751 | free_extent_buffer(eb); | |
6752 | ||
6753 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
6754 | &root_key, root_item); | |
6755 | BUG_ON(ret); | |
6756 | kfree(root_item); | |
6757 | ||
6758 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
6759 | &root_key); | |
6760 | BUG_ON(!reloc_root); | |
6761 | reloc_root->last_trans = trans->transid; | |
6762 | reloc_root->commit_root = NULL; | |
6763 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
6764 | ||
6765 | root->reloc_root = reloc_root; | |
6766 | return 0; | |
6767 | } | |
6768 | ||
6769 | /* | |
6770 | * Core function of space balance. | |
6771 | * | |
6772 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
6773 | * counted roots. There is one reloc tree for each subvol, and all |
6774 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
6775 | * of the latest committed roots of subvols (root->commit_root). | |
6776 | * | |
6777 | * To relocate a tree block referenced by a subvol, there are two steps. | |
6778 | * COW the block through subvol's reloc tree, then update block pointer | |
6779 | * in the subvol to point to the new block. Since all reloc trees share | |
6780 | * same root key objectid, doing special handing for tree blocks owned | |
6781 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
6782 | * we can use the resulting new block directly when the same block is | |
6783 | * required to COW again through other reloc trees. By this way, relocated | |
6784 | * tree blocks are shared between reloc trees, so they are also shared | |
6785 | * between subvols. | |
1a40e23b | 6786 | */ |
d397712b | 6787 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6788 | struct btrfs_root *root, |
6789 | struct btrfs_path *path, | |
6790 | struct btrfs_key *first_key, | |
6791 | struct btrfs_ref_path *ref_path, | |
6792 | struct btrfs_block_group_cache *group, | |
6793 | struct inode *reloc_inode) | |
6794 | { | |
6795 | struct btrfs_root *reloc_root; | |
6796 | struct extent_buffer *eb = NULL; | |
6797 | struct btrfs_key *keys; | |
6798 | u64 *nodes; | |
6799 | int level; | |
f82d02d9 | 6800 | int shared_level; |
1a40e23b | 6801 | int lowest_level = 0; |
1a40e23b ZY |
6802 | int ret; |
6803 | ||
6804 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
6805 | lowest_level = ref_path->owner_objectid; | |
6806 | ||
f82d02d9 | 6807 | if (!root->ref_cows) { |
1a40e23b ZY |
6808 | path->lowest_level = lowest_level; |
6809 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
6810 | BUG_ON(ret < 0); | |
6811 | path->lowest_level = 0; | |
6812 | btrfs_release_path(root, path); | |
6813 | return 0; | |
6814 | } | |
6815 | ||
1a40e23b ZY |
6816 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
6817 | ret = init_reloc_tree(trans, root); | |
6818 | BUG_ON(ret); | |
6819 | reloc_root = root->reloc_root; | |
6820 | ||
f82d02d9 YZ |
6821 | shared_level = ref_path->shared_level; |
6822 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 6823 | |
f82d02d9 YZ |
6824 | keys = ref_path->node_keys; |
6825 | nodes = ref_path->new_nodes; | |
6826 | memset(&keys[shared_level + 1], 0, | |
6827 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
6828 | memset(&nodes[shared_level + 1], 0, | |
6829 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 6830 | |
f82d02d9 YZ |
6831 | if (nodes[lowest_level] == 0) { |
6832 | path->lowest_level = lowest_level; | |
6833 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
6834 | 0, 1); | |
6835 | BUG_ON(ret); | |
6836 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
6837 | eb = path->nodes[level]; | |
6838 | if (!eb || eb == reloc_root->node) | |
6839 | break; | |
6840 | nodes[level] = eb->start; | |
6841 | if (level == 0) | |
6842 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
6843 | else | |
6844 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
6845 | } | |
2b82032c YZ |
6846 | if (nodes[0] && |
6847 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
6848 | eb = path->nodes[0]; |
6849 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
6850 | group, reloc_inode); | |
6851 | BUG_ON(ret); | |
6852 | } | |
6853 | btrfs_release_path(reloc_root, path); | |
6854 | } else { | |
1a40e23b | 6855 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 6856 | lowest_level); |
1a40e23b ZY |
6857 | BUG_ON(ret); |
6858 | } | |
6859 | ||
1a40e23b ZY |
6860 | /* |
6861 | * replace tree blocks in the fs tree with tree blocks in | |
6862 | * the reloc tree. | |
6863 | */ | |
6864 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
6865 | BUG_ON(ret < 0); | |
6866 | ||
6867 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
6868 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
6869 | 0, 0); | |
6870 | BUG_ON(ret); | |
6871 | extent_buffer_get(path->nodes[0]); | |
6872 | eb = path->nodes[0]; | |
6873 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
6874 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
6875 | BUG_ON(ret); | |
6876 | free_extent_buffer(eb); | |
6877 | } | |
1a40e23b | 6878 | |
f82d02d9 | 6879 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 6880 | path->lowest_level = 0; |
1a40e23b ZY |
6881 | return 0; |
6882 | } | |
6883 | ||
d397712b | 6884 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6885 | struct btrfs_root *root, |
6886 | struct btrfs_path *path, | |
6887 | struct btrfs_key *first_key, | |
6888 | struct btrfs_ref_path *ref_path) | |
6889 | { | |
6890 | int ret; | |
1a40e23b ZY |
6891 | |
6892 | ret = relocate_one_path(trans, root, path, first_key, | |
6893 | ref_path, NULL, NULL); | |
6894 | BUG_ON(ret); | |
6895 | ||
1a40e23b ZY |
6896 | return 0; |
6897 | } | |
6898 | ||
d397712b | 6899 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6900 | struct btrfs_root *extent_root, |
6901 | struct btrfs_path *path, | |
6902 | struct btrfs_key *extent_key) | |
6903 | { | |
6904 | int ret; | |
6905 | ||
1a40e23b ZY |
6906 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
6907 | if (ret) | |
6908 | goto out; | |
6909 | ret = btrfs_del_item(trans, extent_root, path); | |
6910 | out: | |
6911 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
6912 | return ret; |
6913 | } | |
6914 | ||
d397712b | 6915 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
6916 | struct btrfs_ref_path *ref_path) |
6917 | { | |
6918 | struct btrfs_key root_key; | |
6919 | ||
6920 | root_key.objectid = ref_path->root_objectid; | |
6921 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
6922 | if (is_cowonly_root(ref_path->root_objectid)) | |
6923 | root_key.offset = 0; | |
6924 | else | |
6925 | root_key.offset = (u64)-1; | |
6926 | ||
6927 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
6928 | } | |
6929 | ||
d397712b | 6930 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
1a40e23b ZY |
6931 | struct btrfs_path *path, |
6932 | struct btrfs_key *extent_key, | |
6933 | struct btrfs_block_group_cache *group, | |
6934 | struct inode *reloc_inode, int pass) | |
6935 | { | |
6936 | struct btrfs_trans_handle *trans; | |
6937 | struct btrfs_root *found_root; | |
6938 | struct btrfs_ref_path *ref_path = NULL; | |
6939 | struct disk_extent *new_extents = NULL; | |
6940 | int nr_extents = 0; | |
6941 | int loops; | |
6942 | int ret; | |
6943 | int level; | |
6944 | struct btrfs_key first_key; | |
6945 | u64 prev_block = 0; | |
6946 | ||
1a40e23b ZY |
6947 | |
6948 | trans = btrfs_start_transaction(extent_root, 1); | |
6949 | BUG_ON(!trans); | |
6950 | ||
6951 | if (extent_key->objectid == 0) { | |
6952 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
6953 | goto out; | |
6954 | } | |
6955 | ||
6956 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
6957 | if (!ref_path) { | |
d397712b CM |
6958 | ret = -ENOMEM; |
6959 | goto out; | |
1a40e23b ZY |
6960 | } |
6961 | ||
6962 | for (loops = 0; ; loops++) { | |
6963 | if (loops == 0) { | |
6964 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
6965 | extent_key->objectid); | |
6966 | } else { | |
6967 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
6968 | } | |
6969 | if (ret < 0) | |
6970 | goto out; | |
6971 | if (ret > 0) | |
6972 | break; | |
6973 | ||
6974 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
6975 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
6976 | continue; | |
6977 | ||
6978 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
6979 | BUG_ON(!found_root); | |
6980 | /* | |
6981 | * for reference counted tree, only process reference paths | |
6982 | * rooted at the latest committed root. | |
6983 | */ | |
6984 | if (found_root->ref_cows && | |
6985 | ref_path->root_generation != found_root->root_key.offset) | |
6986 | continue; | |
6987 | ||
6988 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
6989 | if (pass == 0) { | |
6990 | /* | |
6991 | * copy data extents to new locations | |
6992 | */ | |
6993 | u64 group_start = group->key.objectid; | |
6994 | ret = relocate_data_extent(reloc_inode, | |
6995 | extent_key, | |
6996 | group_start); | |
6997 | if (ret < 0) | |
6998 | goto out; | |
6999 | break; | |
7000 | } | |
7001 | level = 0; | |
7002 | } else { | |
7003 | level = ref_path->owner_objectid; | |
7004 | } | |
7005 | ||
7006 | if (prev_block != ref_path->nodes[level]) { | |
7007 | struct extent_buffer *eb; | |
7008 | u64 block_start = ref_path->nodes[level]; | |
7009 | u64 block_size = btrfs_level_size(found_root, level); | |
7010 | ||
7011 | eb = read_tree_block(found_root, block_start, | |
7012 | block_size, 0); | |
7013 | btrfs_tree_lock(eb); | |
7014 | BUG_ON(level != btrfs_header_level(eb)); | |
7015 | ||
7016 | if (level == 0) | |
7017 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
7018 | else | |
7019 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
7020 | ||
7021 | btrfs_tree_unlock(eb); | |
7022 | free_extent_buffer(eb); | |
7023 | prev_block = block_start; | |
7024 | } | |
7025 | ||
24562425 | 7026 | mutex_lock(&extent_root->fs_info->trans_mutex); |
e4404d6e | 7027 | btrfs_record_root_in_trans(found_root); |
24562425 | 7028 | mutex_unlock(&extent_root->fs_info->trans_mutex); |
e4404d6e YZ |
7029 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
7030 | /* | |
7031 | * try to update data extent references while | |
7032 | * keeping metadata shared between snapshots. | |
7033 | */ | |
7034 | if (pass == 1) { | |
7035 | ret = relocate_one_path(trans, found_root, | |
7036 | path, &first_key, ref_path, | |
7037 | group, reloc_inode); | |
7038 | if (ret < 0) | |
7039 | goto out; | |
7040 | continue; | |
7041 | } | |
1a40e23b ZY |
7042 | /* |
7043 | * use fallback method to process the remaining | |
7044 | * references. | |
7045 | */ | |
7046 | if (!new_extents) { | |
7047 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
7048 | new_extents = kmalloc(sizeof(*new_extents), |
7049 | GFP_NOFS); | |
7050 | nr_extents = 1; | |
1a40e23b ZY |
7051 | ret = get_new_locations(reloc_inode, |
7052 | extent_key, | |
d899e052 | 7053 | group_start, 1, |
1a40e23b ZY |
7054 | &new_extents, |
7055 | &nr_extents); | |
d899e052 | 7056 | if (ret) |
1a40e23b ZY |
7057 | goto out; |
7058 | } | |
1a40e23b ZY |
7059 | ret = replace_one_extent(trans, found_root, |
7060 | path, extent_key, | |
7061 | &first_key, ref_path, | |
7062 | new_extents, nr_extents); | |
e4404d6e | 7063 | } else { |
1a40e23b ZY |
7064 | ret = relocate_tree_block(trans, found_root, path, |
7065 | &first_key, ref_path); | |
1a40e23b ZY |
7066 | } |
7067 | if (ret < 0) | |
7068 | goto out; | |
7069 | } | |
7070 | ret = 0; | |
7071 | out: | |
7072 | btrfs_end_transaction(trans, extent_root); | |
7073 | kfree(new_extents); | |
7074 | kfree(ref_path); | |
1a40e23b ZY |
7075 | return ret; |
7076 | } | |
5d4f98a2 | 7077 | #endif |
1a40e23b | 7078 | |
ec44a35c CM |
7079 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7080 | { | |
7081 | u64 num_devices; | |
7082 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
7083 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
7084 | ||
2b82032c | 7085 | num_devices = root->fs_info->fs_devices->rw_devices; |
ec44a35c CM |
7086 | if (num_devices == 1) { |
7087 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7088 | stripped = flags & ~stripped; | |
7089 | ||
7090 | /* turn raid0 into single device chunks */ | |
7091 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7092 | return stripped; | |
7093 | ||
7094 | /* turn mirroring into duplication */ | |
7095 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7096 | BTRFS_BLOCK_GROUP_RAID10)) | |
7097 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
7098 | return flags; | |
7099 | } else { | |
7100 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7101 | if (flags & stripped) |
7102 | return flags; | |
7103 | ||
7104 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7105 | stripped = flags & ~stripped; | |
7106 | ||
7107 | /* switch duplicated blocks with raid1 */ | |
7108 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7109 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7110 | ||
7111 | /* turn single device chunks into raid0 */ | |
7112 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
7113 | } | |
7114 | return flags; | |
7115 | } | |
7116 | ||
b2950863 | 7117 | static int __alloc_chunk_for_shrink(struct btrfs_root *root, |
0ef3e66b CM |
7118 | struct btrfs_block_group_cache *shrink_block_group, |
7119 | int force) | |
7120 | { | |
7121 | struct btrfs_trans_handle *trans; | |
7122 | u64 new_alloc_flags; | |
7123 | u64 calc; | |
7124 | ||
c286ac48 | 7125 | spin_lock(&shrink_block_group->lock); |
5d4f98a2 YZ |
7126 | if (btrfs_block_group_used(&shrink_block_group->item) + |
7127 | shrink_block_group->reserved > 0) { | |
c286ac48 | 7128 | spin_unlock(&shrink_block_group->lock); |
c286ac48 | 7129 | |
0ef3e66b | 7130 | trans = btrfs_start_transaction(root, 1); |
c286ac48 | 7131 | spin_lock(&shrink_block_group->lock); |
7d9eb12c | 7132 | |
0ef3e66b CM |
7133 | new_alloc_flags = update_block_group_flags(root, |
7134 | shrink_block_group->flags); | |
7135 | if (new_alloc_flags != shrink_block_group->flags) { | |
7136 | calc = | |
7137 | btrfs_block_group_used(&shrink_block_group->item); | |
7138 | } else { | |
7139 | calc = shrink_block_group->key.offset; | |
7140 | } | |
c286ac48 CM |
7141 | spin_unlock(&shrink_block_group->lock); |
7142 | ||
0ef3e66b CM |
7143 | do_chunk_alloc(trans, root->fs_info->extent_root, |
7144 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
7d9eb12c | 7145 | |
0ef3e66b | 7146 | btrfs_end_transaction(trans, root); |
c286ac48 CM |
7147 | } else |
7148 | spin_unlock(&shrink_block_group->lock); | |
0ef3e66b CM |
7149 | return 0; |
7150 | } | |
7151 | ||
5d4f98a2 YZ |
7152 | |
7153 | int btrfs_prepare_block_group_relocation(struct btrfs_root *root, | |
7154 | struct btrfs_block_group_cache *group) | |
7155 | ||
7156 | { | |
7157 | __alloc_chunk_for_shrink(root, group, 1); | |
7158 | set_block_group_readonly(group); | |
7159 | return 0; | |
7160 | } | |
7161 | ||
ba1bf481 JB |
7162 | /* |
7163 | * checks to see if its even possible to relocate this block group. | |
7164 | * | |
7165 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
7166 | * ok to go ahead and try. | |
7167 | */ | |
7168 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
7169 | { | |
7170 | struct btrfs_block_group_cache *block_group; | |
7171 | struct btrfs_space_info *space_info; | |
7172 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
7173 | struct btrfs_device *device; | |
7174 | int full = 0; | |
7175 | int ret = 0; | |
7176 | ||
7177 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
7178 | ||
7179 | /* odd, couldn't find the block group, leave it alone */ | |
7180 | if (!block_group) | |
7181 | return -1; | |
7182 | ||
7183 | /* no bytes used, we're good */ | |
7184 | if (!btrfs_block_group_used(&block_group->item)) | |
7185 | goto out; | |
7186 | ||
7187 | space_info = block_group->space_info; | |
7188 | spin_lock(&space_info->lock); | |
7189 | ||
7190 | full = space_info->full; | |
7191 | ||
7192 | /* | |
7193 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
7194 | * relocate it unless we're able to allocate a new chunk below. |
7195 | * | |
7196 | * Otherwise, we need to make sure we have room in the space to handle | |
7197 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 7198 | */ |
7ce618db CM |
7199 | if ((space_info->total_bytes != block_group->key.offset) && |
7200 | (space_info->bytes_used + space_info->bytes_reserved + | |
ba1bf481 JB |
7201 | space_info->bytes_pinned + space_info->bytes_readonly + |
7202 | btrfs_block_group_used(&block_group->item) < | |
7ce618db | 7203 | space_info->total_bytes)) { |
ba1bf481 JB |
7204 | spin_unlock(&space_info->lock); |
7205 | goto out; | |
7206 | } | |
7207 | spin_unlock(&space_info->lock); | |
7208 | ||
7209 | /* | |
7210 | * ok we don't have enough space, but maybe we have free space on our | |
7211 | * devices to allocate new chunks for relocation, so loop through our | |
7212 | * alloc devices and guess if we have enough space. However, if we | |
7213 | * were marked as full, then we know there aren't enough chunks, and we | |
7214 | * can just return. | |
7215 | */ | |
7216 | ret = -1; | |
7217 | if (full) | |
7218 | goto out; | |
7219 | ||
7220 | mutex_lock(&root->fs_info->chunk_mutex); | |
7221 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7222 | u64 min_free = btrfs_block_group_used(&block_group->item); | |
7223 | u64 dev_offset, max_avail; | |
7224 | ||
7225 | /* | |
7226 | * check to make sure we can actually find a chunk with enough | |
7227 | * space to fit our block group in. | |
7228 | */ | |
7229 | if (device->total_bytes > device->bytes_used + min_free) { | |
7230 | ret = find_free_dev_extent(NULL, device, min_free, | |
7231 | &dev_offset, &max_avail); | |
7232 | if (!ret) | |
7233 | break; | |
7234 | ret = -1; | |
7235 | } | |
7236 | } | |
7237 | mutex_unlock(&root->fs_info->chunk_mutex); | |
7238 | out: | |
7239 | btrfs_put_block_group(block_group); | |
7240 | return ret; | |
7241 | } | |
7242 | ||
b2950863 CH |
7243 | static int find_first_block_group(struct btrfs_root *root, |
7244 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 7245 | { |
925baedd | 7246 | int ret = 0; |
0b86a832 CM |
7247 | struct btrfs_key found_key; |
7248 | struct extent_buffer *leaf; | |
7249 | int slot; | |
edbd8d4e | 7250 | |
0b86a832 CM |
7251 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
7252 | if (ret < 0) | |
925baedd CM |
7253 | goto out; |
7254 | ||
d397712b | 7255 | while (1) { |
0b86a832 | 7256 | slot = path->slots[0]; |
edbd8d4e | 7257 | leaf = path->nodes[0]; |
0b86a832 CM |
7258 | if (slot >= btrfs_header_nritems(leaf)) { |
7259 | ret = btrfs_next_leaf(root, path); | |
7260 | if (ret == 0) | |
7261 | continue; | |
7262 | if (ret < 0) | |
925baedd | 7263 | goto out; |
0b86a832 | 7264 | break; |
edbd8d4e | 7265 | } |
0b86a832 | 7266 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 7267 | |
0b86a832 | 7268 | if (found_key.objectid >= key->objectid && |
925baedd CM |
7269 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
7270 | ret = 0; | |
7271 | goto out; | |
7272 | } | |
0b86a832 | 7273 | path->slots[0]++; |
edbd8d4e | 7274 | } |
0b86a832 | 7275 | ret = -ENOENT; |
925baedd | 7276 | out: |
0b86a832 | 7277 | return ret; |
edbd8d4e CM |
7278 | } |
7279 | ||
1a40e23b ZY |
7280 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
7281 | { | |
7282 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 7283 | struct btrfs_space_info *space_info; |
11833d66 | 7284 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
7285 | struct rb_node *n; |
7286 | ||
11833d66 YZ |
7287 | down_write(&info->extent_commit_sem); |
7288 | while (!list_empty(&info->caching_block_groups)) { | |
7289 | caching_ctl = list_entry(info->caching_block_groups.next, | |
7290 | struct btrfs_caching_control, list); | |
7291 | list_del(&caching_ctl->list); | |
7292 | put_caching_control(caching_ctl); | |
7293 | } | |
7294 | up_write(&info->extent_commit_sem); | |
7295 | ||
1a40e23b ZY |
7296 | spin_lock(&info->block_group_cache_lock); |
7297 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
7298 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
7299 | cache_node); | |
1a40e23b ZY |
7300 | rb_erase(&block_group->cache_node, |
7301 | &info->block_group_cache_tree); | |
d899e052 YZ |
7302 | spin_unlock(&info->block_group_cache_lock); |
7303 | ||
80eb234a | 7304 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 7305 | list_del(&block_group->list); |
80eb234a | 7306 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 7307 | |
817d52f8 | 7308 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7309 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
7310 | |
7311 | btrfs_remove_free_space_cache(block_group); | |
7312 | ||
d2fb3437 | 7313 | WARN_ON(atomic_read(&block_group->count) != 1); |
1a40e23b | 7314 | kfree(block_group); |
d899e052 YZ |
7315 | |
7316 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
7317 | } |
7318 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
7319 | |
7320 | /* now that all the block groups are freed, go through and | |
7321 | * free all the space_info structs. This is only called during | |
7322 | * the final stages of unmount, and so we know nobody is | |
7323 | * using them. We call synchronize_rcu() once before we start, | |
7324 | * just to be on the safe side. | |
7325 | */ | |
7326 | synchronize_rcu(); | |
7327 | ||
7328 | while(!list_empty(&info->space_info)) { | |
7329 | space_info = list_entry(info->space_info.next, | |
7330 | struct btrfs_space_info, | |
7331 | list); | |
7332 | ||
7333 | list_del(&space_info->list); | |
7334 | kfree(space_info); | |
7335 | } | |
1a40e23b ZY |
7336 | return 0; |
7337 | } | |
7338 | ||
9078a3e1 CM |
7339 | int btrfs_read_block_groups(struct btrfs_root *root) |
7340 | { | |
7341 | struct btrfs_path *path; | |
7342 | int ret; | |
9078a3e1 | 7343 | struct btrfs_block_group_cache *cache; |
be744175 | 7344 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 7345 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
7346 | struct btrfs_key key; |
7347 | struct btrfs_key found_key; | |
5f39d397 | 7348 | struct extent_buffer *leaf; |
96b5179d | 7349 | |
be744175 | 7350 | root = info->extent_root; |
9078a3e1 | 7351 | key.objectid = 0; |
0b86a832 | 7352 | key.offset = 0; |
9078a3e1 | 7353 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
7354 | path = btrfs_alloc_path(); |
7355 | if (!path) | |
7356 | return -ENOMEM; | |
7357 | ||
d397712b | 7358 | while (1) { |
0b86a832 CM |
7359 | ret = find_first_block_group(root, path, &key); |
7360 | if (ret > 0) { | |
7361 | ret = 0; | |
7362 | goto error; | |
9078a3e1 | 7363 | } |
0b86a832 CM |
7364 | if (ret != 0) |
7365 | goto error; | |
7366 | ||
5f39d397 CM |
7367 | leaf = path->nodes[0]; |
7368 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 7369 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 7370 | if (!cache) { |
0b86a832 | 7371 | ret = -ENOMEM; |
9078a3e1 CM |
7372 | break; |
7373 | } | |
3e1ad54f | 7374 | |
d2fb3437 | 7375 | atomic_set(&cache->count, 1); |
c286ac48 | 7376 | spin_lock_init(&cache->lock); |
6226cb0a | 7377 | spin_lock_init(&cache->tree_lock); |
817d52f8 | 7378 | cache->fs_info = info; |
0f9dd46c | 7379 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7380 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 JB |
7381 | |
7382 | /* | |
7383 | * we only want to have 32k of ram per block group for keeping | |
7384 | * track of free space, and if we pass 1/2 of that we want to | |
7385 | * start converting things over to using bitmaps | |
7386 | */ | |
7387 | cache->extents_thresh = ((1024 * 32) / 2) / | |
7388 | sizeof(struct btrfs_free_space); | |
7389 | ||
5f39d397 CM |
7390 | read_extent_buffer(leaf, &cache->item, |
7391 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
7392 | sizeof(cache->item)); | |
9078a3e1 | 7393 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 7394 | |
9078a3e1 CM |
7395 | key.objectid = found_key.objectid + found_key.offset; |
7396 | btrfs_release_path(root, path); | |
0b86a832 | 7397 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
7398 | cache->sectorsize = root->sectorsize; |
7399 | ||
817d52f8 JB |
7400 | /* |
7401 | * check for two cases, either we are full, and therefore | |
7402 | * don't need to bother with the caching work since we won't | |
7403 | * find any space, or we are empty, and we can just add all | |
7404 | * the space in and be done with it. This saves us _alot_ of | |
7405 | * time, particularly in the full case. | |
7406 | */ | |
7407 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
1b2da372 | 7408 | exclude_super_stripes(root, cache); |
11833d66 | 7409 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7410 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 7411 | free_excluded_extents(root, cache); |
817d52f8 | 7412 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 YZ |
7413 | exclude_super_stripes(root, cache); |
7414 | cache->last_byte_to_unpin = (u64)-1; | |
817d52f8 JB |
7415 | cache->cached = BTRFS_CACHE_FINISHED; |
7416 | add_new_free_space(cache, root->fs_info, | |
7417 | found_key.objectid, | |
7418 | found_key.objectid + | |
7419 | found_key.offset); | |
11833d66 | 7420 | free_excluded_extents(root, cache); |
817d52f8 | 7421 | } |
96b5179d | 7422 | |
6324fbf3 CM |
7423 | ret = update_space_info(info, cache->flags, found_key.offset, |
7424 | btrfs_block_group_used(&cache->item), | |
7425 | &space_info); | |
7426 | BUG_ON(ret); | |
7427 | cache->space_info = space_info; | |
1b2da372 JB |
7428 | spin_lock(&cache->space_info->lock); |
7429 | cache->space_info->bytes_super += cache->bytes_super; | |
7430 | spin_unlock(&cache->space_info->lock); | |
7431 | ||
80eb234a JB |
7432 | down_write(&space_info->groups_sem); |
7433 | list_add_tail(&cache->list, &space_info->block_groups); | |
7434 | up_write(&space_info->groups_sem); | |
0f9dd46c JB |
7435 | |
7436 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
7437 | BUG_ON(ret); | |
75ccf47d CM |
7438 | |
7439 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c YZ |
7440 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
7441 | set_block_group_readonly(cache); | |
9078a3e1 | 7442 | } |
0b86a832 CM |
7443 | ret = 0; |
7444 | error: | |
9078a3e1 | 7445 | btrfs_free_path(path); |
0b86a832 | 7446 | return ret; |
9078a3e1 | 7447 | } |
6324fbf3 CM |
7448 | |
7449 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
7450 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 7451 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
7452 | u64 size) |
7453 | { | |
7454 | int ret; | |
6324fbf3 CM |
7455 | struct btrfs_root *extent_root; |
7456 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
7457 | |
7458 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 7459 | |
12fcfd22 | 7460 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 7461 | |
8f18cf13 | 7462 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
7463 | if (!cache) |
7464 | return -ENOMEM; | |
7465 | ||
e17cade2 | 7466 | cache->key.objectid = chunk_offset; |
6324fbf3 | 7467 | cache->key.offset = size; |
d2fb3437 | 7468 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 JB |
7469 | cache->sectorsize = root->sectorsize; |
7470 | ||
7471 | /* | |
7472 | * we only want to have 32k of ram per block group for keeping track | |
7473 | * of free space, and if we pass 1/2 of that we want to start | |
7474 | * converting things over to using bitmaps | |
7475 | */ | |
7476 | cache->extents_thresh = ((1024 * 32) / 2) / | |
7477 | sizeof(struct btrfs_free_space); | |
d2fb3437 | 7478 | atomic_set(&cache->count, 1); |
c286ac48 | 7479 | spin_lock_init(&cache->lock); |
6226cb0a | 7480 | spin_lock_init(&cache->tree_lock); |
0f9dd46c | 7481 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7482 | INIT_LIST_HEAD(&cache->cluster_list); |
0ef3e66b | 7483 | |
6324fbf3 | 7484 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
7485 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
7486 | cache->flags = type; | |
7487 | btrfs_set_block_group_flags(&cache->item, type); | |
7488 | ||
11833d66 | 7489 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7490 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 7491 | exclude_super_stripes(root, cache); |
96303081 | 7492 | |
817d52f8 JB |
7493 | add_new_free_space(cache, root->fs_info, chunk_offset, |
7494 | chunk_offset + size); | |
7495 | ||
11833d66 YZ |
7496 | free_excluded_extents(root, cache); |
7497 | ||
6324fbf3 CM |
7498 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
7499 | &cache->space_info); | |
7500 | BUG_ON(ret); | |
1b2da372 JB |
7501 | |
7502 | spin_lock(&cache->space_info->lock); | |
7503 | cache->space_info->bytes_super += cache->bytes_super; | |
7504 | spin_unlock(&cache->space_info->lock); | |
7505 | ||
80eb234a JB |
7506 | down_write(&cache->space_info->groups_sem); |
7507 | list_add_tail(&cache->list, &cache->space_info->block_groups); | |
7508 | up_write(&cache->space_info->groups_sem); | |
6324fbf3 | 7509 | |
0f9dd46c JB |
7510 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
7511 | BUG_ON(ret); | |
c286ac48 | 7512 | |
6324fbf3 CM |
7513 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
7514 | sizeof(cache->item)); | |
7515 | BUG_ON(ret); | |
7516 | ||
d18a2c44 | 7517 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 7518 | |
6324fbf3 CM |
7519 | return 0; |
7520 | } | |
1a40e23b ZY |
7521 | |
7522 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
7523 | struct btrfs_root *root, u64 group_start) | |
7524 | { | |
7525 | struct btrfs_path *path; | |
7526 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 7527 | struct btrfs_free_cluster *cluster; |
1a40e23b ZY |
7528 | struct btrfs_key key; |
7529 | int ret; | |
7530 | ||
1a40e23b ZY |
7531 | root = root->fs_info->extent_root; |
7532 | ||
7533 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
7534 | BUG_ON(!block_group); | |
c146afad | 7535 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
7536 | |
7537 | memcpy(&key, &block_group->key, sizeof(key)); | |
7538 | ||
44fb5511 CM |
7539 | /* make sure this block group isn't part of an allocation cluster */ |
7540 | cluster = &root->fs_info->data_alloc_cluster; | |
7541 | spin_lock(&cluster->refill_lock); | |
7542 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7543 | spin_unlock(&cluster->refill_lock); | |
7544 | ||
7545 | /* | |
7546 | * make sure this block group isn't part of a metadata | |
7547 | * allocation cluster | |
7548 | */ | |
7549 | cluster = &root->fs_info->meta_alloc_cluster; | |
7550 | spin_lock(&cluster->refill_lock); | |
7551 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7552 | spin_unlock(&cluster->refill_lock); | |
7553 | ||
1a40e23b ZY |
7554 | path = btrfs_alloc_path(); |
7555 | BUG_ON(!path); | |
7556 | ||
3dfdb934 | 7557 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
7558 | rb_erase(&block_group->cache_node, |
7559 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 | 7560 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 7561 | |
80eb234a | 7562 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
7563 | /* |
7564 | * we must use list_del_init so people can check to see if they | |
7565 | * are still on the list after taking the semaphore | |
7566 | */ | |
7567 | list_del_init(&block_group->list); | |
80eb234a | 7568 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 7569 | |
817d52f8 | 7570 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7571 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
7572 | |
7573 | btrfs_remove_free_space_cache(block_group); | |
7574 | ||
c146afad YZ |
7575 | spin_lock(&block_group->space_info->lock); |
7576 | block_group->space_info->total_bytes -= block_group->key.offset; | |
7577 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
7578 | spin_unlock(&block_group->space_info->lock); | |
283bb197 CM |
7579 | |
7580 | btrfs_clear_space_info_full(root->fs_info); | |
c146afad | 7581 | |
fa9c0d79 CM |
7582 | btrfs_put_block_group(block_group); |
7583 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
7584 | |
7585 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
7586 | if (ret > 0) | |
7587 | ret = -EIO; | |
7588 | if (ret < 0) | |
7589 | goto out; | |
7590 | ||
7591 | ret = btrfs_del_item(trans, root, path); | |
7592 | out: | |
7593 | btrfs_free_path(path); | |
7594 | return ret; | |
7595 | } |