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