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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
4b4e25f2 | 26 | #include "compat.h" |
74493f7a | 27 | #include "hash.h" |
fec577fb CM |
28 | #include "ctree.h" |
29 | #include "disk-io.h" | |
30 | #include "print-tree.h" | |
e089f05c | 31 | #include "transaction.h" |
0b86a832 | 32 | #include "volumes.h" |
925baedd | 33 | #include "locking.h" |
fa9c0d79 | 34 | #include "free-space-cache.h" |
fec577fb | 35 | |
f3465ca4 JB |
36 | static int update_block_group(struct btrfs_trans_handle *trans, |
37 | struct btrfs_root *root, | |
f0486c68 YZ |
38 | u64 bytenr, u64 num_bytes, int alloc); |
39 | static int update_reserved_bytes(struct btrfs_block_group_cache *cache, | |
40 | u64 num_bytes, int reserve, int sinfo); | |
5d4f98a2 YZ |
41 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
42 | struct btrfs_root *root, | |
43 | u64 bytenr, u64 num_bytes, u64 parent, | |
44 | u64 root_objectid, u64 owner_objectid, | |
45 | u64 owner_offset, int refs_to_drop, | |
46 | struct btrfs_delayed_extent_op *extra_op); | |
47 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
48 | struct extent_buffer *leaf, | |
49 | struct btrfs_extent_item *ei); | |
50 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
51 | struct btrfs_root *root, | |
52 | u64 parent, u64 root_objectid, | |
53 | u64 flags, u64 owner, u64 offset, | |
54 | struct btrfs_key *ins, int ref_mod); | |
55 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
56 | struct btrfs_root *root, | |
57 | u64 parent, u64 root_objectid, | |
58 | u64 flags, struct btrfs_disk_key *key, | |
59 | int level, struct btrfs_key *ins); | |
6a63209f JB |
60 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
61 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
62 | u64 flags, int force); | |
11833d66 YZ |
63 | static int find_next_key(struct btrfs_path *path, int level, |
64 | struct btrfs_key *key); | |
9ed74f2d JB |
65 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
66 | int dump_block_groups); | |
6a63209f | 67 | |
817d52f8 JB |
68 | static noinline int |
69 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
70 | { | |
71 | smp_mb(); | |
72 | return cache->cached == BTRFS_CACHE_FINISHED; | |
73 | } | |
74 | ||
0f9dd46c JB |
75 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
76 | { | |
77 | return (cache->flags & bits) == bits; | |
78 | } | |
79 | ||
11dfe35a JB |
80 | void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
81 | { | |
82 | atomic_inc(&cache->count); | |
83 | } | |
84 | ||
85 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
86 | { | |
f0486c68 YZ |
87 | if (atomic_dec_and_test(&cache->count)) { |
88 | WARN_ON(cache->pinned > 0); | |
89 | WARN_ON(cache->reserved > 0); | |
90 | WARN_ON(cache->reserved_pinned > 0); | |
11dfe35a | 91 | kfree(cache); |
f0486c68 | 92 | } |
11dfe35a JB |
93 | } |
94 | ||
0f9dd46c JB |
95 | /* |
96 | * this adds the block group to the fs_info rb tree for the block group | |
97 | * cache | |
98 | */ | |
b2950863 | 99 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
100 | struct btrfs_block_group_cache *block_group) |
101 | { | |
102 | struct rb_node **p; | |
103 | struct rb_node *parent = NULL; | |
104 | struct btrfs_block_group_cache *cache; | |
105 | ||
106 | spin_lock(&info->block_group_cache_lock); | |
107 | p = &info->block_group_cache_tree.rb_node; | |
108 | ||
109 | while (*p) { | |
110 | parent = *p; | |
111 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
112 | cache_node); | |
113 | if (block_group->key.objectid < cache->key.objectid) { | |
114 | p = &(*p)->rb_left; | |
115 | } else if (block_group->key.objectid > cache->key.objectid) { | |
116 | p = &(*p)->rb_right; | |
117 | } else { | |
118 | spin_unlock(&info->block_group_cache_lock); | |
119 | return -EEXIST; | |
120 | } | |
121 | } | |
122 | ||
123 | rb_link_node(&block_group->cache_node, parent, p); | |
124 | rb_insert_color(&block_group->cache_node, | |
125 | &info->block_group_cache_tree); | |
126 | spin_unlock(&info->block_group_cache_lock); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | /* | |
132 | * This will return the block group at or after bytenr if contains is 0, else | |
133 | * it will return the block group that contains the bytenr | |
134 | */ | |
135 | static struct btrfs_block_group_cache * | |
136 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
137 | int contains) | |
138 | { | |
139 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
140 | struct rb_node *n; | |
141 | u64 end, start; | |
142 | ||
143 | spin_lock(&info->block_group_cache_lock); | |
144 | n = info->block_group_cache_tree.rb_node; | |
145 | ||
146 | while (n) { | |
147 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
148 | cache_node); | |
149 | end = cache->key.objectid + cache->key.offset - 1; | |
150 | start = cache->key.objectid; | |
151 | ||
152 | if (bytenr < start) { | |
153 | if (!contains && (!ret || start < ret->key.objectid)) | |
154 | ret = cache; | |
155 | n = n->rb_left; | |
156 | } else if (bytenr > start) { | |
157 | if (contains && bytenr <= end) { | |
158 | ret = cache; | |
159 | break; | |
160 | } | |
161 | n = n->rb_right; | |
162 | } else { | |
163 | ret = cache; | |
164 | break; | |
165 | } | |
166 | } | |
d2fb3437 | 167 | if (ret) |
11dfe35a | 168 | btrfs_get_block_group(ret); |
0f9dd46c JB |
169 | spin_unlock(&info->block_group_cache_lock); |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
11833d66 YZ |
174 | static int add_excluded_extent(struct btrfs_root *root, |
175 | u64 start, u64 num_bytes) | |
817d52f8 | 176 | { |
11833d66 YZ |
177 | u64 end = start + num_bytes - 1; |
178 | set_extent_bits(&root->fs_info->freed_extents[0], | |
179 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
180 | set_extent_bits(&root->fs_info->freed_extents[1], | |
181 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
182 | return 0; | |
183 | } | |
817d52f8 | 184 | |
11833d66 YZ |
185 | static void free_excluded_extents(struct btrfs_root *root, |
186 | struct btrfs_block_group_cache *cache) | |
187 | { | |
188 | u64 start, end; | |
817d52f8 | 189 | |
11833d66 YZ |
190 | start = cache->key.objectid; |
191 | end = start + cache->key.offset - 1; | |
192 | ||
193 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
194 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
195 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
196 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
197 | } |
198 | ||
11833d66 YZ |
199 | static int exclude_super_stripes(struct btrfs_root *root, |
200 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 201 | { |
817d52f8 JB |
202 | u64 bytenr; |
203 | u64 *logical; | |
204 | int stripe_len; | |
205 | int i, nr, ret; | |
206 | ||
06b2331f YZ |
207 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
208 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
209 | cache->bytes_super += stripe_len; | |
210 | ret = add_excluded_extent(root, cache->key.objectid, | |
211 | stripe_len); | |
212 | BUG_ON(ret); | |
213 | } | |
214 | ||
817d52f8 JB |
215 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
216 | bytenr = btrfs_sb_offset(i); | |
217 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
218 | cache->key.objectid, bytenr, | |
219 | 0, &logical, &nr, &stripe_len); | |
220 | BUG_ON(ret); | |
11833d66 | 221 | |
817d52f8 | 222 | while (nr--) { |
1b2da372 | 223 | cache->bytes_super += stripe_len; |
11833d66 YZ |
224 | ret = add_excluded_extent(root, logical[nr], |
225 | stripe_len); | |
226 | BUG_ON(ret); | |
817d52f8 | 227 | } |
11833d66 | 228 | |
817d52f8 JB |
229 | kfree(logical); |
230 | } | |
817d52f8 JB |
231 | return 0; |
232 | } | |
233 | ||
11833d66 YZ |
234 | static struct btrfs_caching_control * |
235 | get_caching_control(struct btrfs_block_group_cache *cache) | |
236 | { | |
237 | struct btrfs_caching_control *ctl; | |
238 | ||
239 | spin_lock(&cache->lock); | |
240 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
241 | spin_unlock(&cache->lock); | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | ctl = cache->caching_ctl; | |
246 | atomic_inc(&ctl->count); | |
247 | spin_unlock(&cache->lock); | |
248 | return ctl; | |
249 | } | |
250 | ||
251 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
252 | { | |
253 | if (atomic_dec_and_test(&ctl->count)) | |
254 | kfree(ctl); | |
255 | } | |
256 | ||
0f9dd46c JB |
257 | /* |
258 | * this is only called by cache_block_group, since we could have freed extents | |
259 | * we need to check the pinned_extents for any extents that can't be used yet | |
260 | * since their free space will be released as soon as the transaction commits. | |
261 | */ | |
817d52f8 | 262 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
263 | struct btrfs_fs_info *info, u64 start, u64 end) |
264 | { | |
817d52f8 | 265 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
266 | int ret; |
267 | ||
268 | while (start < end) { | |
11833d66 | 269 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 270 | &extent_start, &extent_end, |
11833d66 | 271 | EXTENT_DIRTY | EXTENT_UPTODATE); |
0f9dd46c JB |
272 | if (ret) |
273 | break; | |
274 | ||
06b2331f | 275 | if (extent_start <= start) { |
0f9dd46c JB |
276 | start = extent_end + 1; |
277 | } else if (extent_start > start && extent_start < end) { | |
278 | size = extent_start - start; | |
817d52f8 | 279 | total_added += size; |
ea6a478e JB |
280 | ret = btrfs_add_free_space(block_group, start, |
281 | size); | |
0f9dd46c JB |
282 | BUG_ON(ret); |
283 | start = extent_end + 1; | |
284 | } else { | |
285 | break; | |
286 | } | |
287 | } | |
288 | ||
289 | if (start < end) { | |
290 | size = end - start; | |
817d52f8 | 291 | total_added += size; |
ea6a478e | 292 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
293 | BUG_ON(ret); |
294 | } | |
295 | ||
817d52f8 | 296 | return total_added; |
0f9dd46c JB |
297 | } |
298 | ||
817d52f8 | 299 | static int caching_kthread(void *data) |
e37c9e69 | 300 | { |
817d52f8 JB |
301 | struct btrfs_block_group_cache *block_group = data; |
302 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
11833d66 YZ |
303 | struct btrfs_caching_control *caching_ctl = block_group->caching_ctl; |
304 | struct btrfs_root *extent_root = fs_info->extent_root; | |
e37c9e69 | 305 | struct btrfs_path *path; |
5f39d397 | 306 | struct extent_buffer *leaf; |
11833d66 | 307 | struct btrfs_key key; |
817d52f8 | 308 | u64 total_found = 0; |
11833d66 YZ |
309 | u64 last = 0; |
310 | u32 nritems; | |
311 | int ret = 0; | |
f510cfec | 312 | |
e37c9e69 CM |
313 | path = btrfs_alloc_path(); |
314 | if (!path) | |
315 | return -ENOMEM; | |
7d7d6068 | 316 | |
11833d66 | 317 | exclude_super_stripes(extent_root, block_group); |
1b2da372 | 318 | spin_lock(&block_group->space_info->lock); |
f0486c68 | 319 | block_group->space_info->bytes_readonly += block_group->bytes_super; |
1b2da372 | 320 | spin_unlock(&block_group->space_info->lock); |
11833d66 | 321 | |
817d52f8 | 322 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 323 | |
5cd57b2c | 324 | /* |
817d52f8 JB |
325 | * We don't want to deadlock with somebody trying to allocate a new |
326 | * extent for the extent root while also trying to search the extent | |
327 | * root to add free space. So we skip locking and search the commit | |
328 | * root, since its read-only | |
5cd57b2c CM |
329 | */ |
330 | path->skip_locking = 1; | |
817d52f8 JB |
331 | path->search_commit_root = 1; |
332 | path->reada = 2; | |
333 | ||
e4404d6e | 334 | key.objectid = last; |
e37c9e69 | 335 | key.offset = 0; |
11833d66 | 336 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 337 | again: |
11833d66 | 338 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
339 | /* need to make sure the commit_root doesn't disappear */ |
340 | down_read(&fs_info->extent_commit_sem); | |
341 | ||
11833d66 | 342 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 343 | if (ret < 0) |
ef8bbdfe | 344 | goto err; |
a512bbf8 | 345 | |
11833d66 YZ |
346 | leaf = path->nodes[0]; |
347 | nritems = btrfs_header_nritems(leaf); | |
348 | ||
d397712b | 349 | while (1) { |
817d52f8 | 350 | smp_mb(); |
11833d66 | 351 | if (fs_info->closing > 1) { |
f25784b3 | 352 | last = (u64)-1; |
817d52f8 | 353 | break; |
f25784b3 | 354 | } |
817d52f8 | 355 | |
11833d66 YZ |
356 | if (path->slots[0] < nritems) { |
357 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
358 | } else { | |
359 | ret = find_next_key(path, 0, &key); | |
360 | if (ret) | |
e37c9e69 | 361 | break; |
817d52f8 | 362 | |
11833d66 YZ |
363 | caching_ctl->progress = last; |
364 | btrfs_release_path(extent_root, path); | |
365 | up_read(&fs_info->extent_commit_sem); | |
366 | mutex_unlock(&caching_ctl->mutex); | |
367 | if (btrfs_transaction_in_commit(fs_info)) | |
f36f3042 | 368 | schedule_timeout(1); |
11833d66 YZ |
369 | else |
370 | cond_resched(); | |
371 | goto again; | |
372 | } | |
817d52f8 | 373 | |
11833d66 YZ |
374 | if (key.objectid < block_group->key.objectid) { |
375 | path->slots[0]++; | |
817d52f8 | 376 | continue; |
e37c9e69 | 377 | } |
0f9dd46c | 378 | |
e37c9e69 | 379 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 380 | block_group->key.offset) |
e37c9e69 | 381 | break; |
7d7d6068 | 382 | |
11833d66 | 383 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
384 | total_found += add_new_free_space(block_group, |
385 | fs_info, last, | |
386 | key.objectid); | |
7d7d6068 | 387 | last = key.objectid + key.offset; |
817d52f8 | 388 | |
11833d66 YZ |
389 | if (total_found > (1024 * 1024 * 2)) { |
390 | total_found = 0; | |
391 | wake_up(&caching_ctl->wait); | |
392 | } | |
817d52f8 | 393 | } |
e37c9e69 CM |
394 | path->slots[0]++; |
395 | } | |
817d52f8 | 396 | ret = 0; |
e37c9e69 | 397 | |
817d52f8 JB |
398 | total_found += add_new_free_space(block_group, fs_info, last, |
399 | block_group->key.objectid + | |
400 | block_group->key.offset); | |
11833d66 | 401 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
402 | |
403 | spin_lock(&block_group->lock); | |
11833d66 | 404 | block_group->caching_ctl = NULL; |
817d52f8 JB |
405 | block_group->cached = BTRFS_CACHE_FINISHED; |
406 | spin_unlock(&block_group->lock); | |
0f9dd46c | 407 | |
54aa1f4d | 408 | err: |
e37c9e69 | 409 | btrfs_free_path(path); |
276e680d | 410 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 411 | |
11833d66 YZ |
412 | free_excluded_extents(extent_root, block_group); |
413 | ||
414 | mutex_unlock(&caching_ctl->mutex); | |
415 | wake_up(&caching_ctl->wait); | |
416 | ||
417 | put_caching_control(caching_ctl); | |
418 | atomic_dec(&block_group->space_info->caching_threads); | |
11dfe35a JB |
419 | btrfs_put_block_group(block_group); |
420 | ||
817d52f8 JB |
421 | return 0; |
422 | } | |
423 | ||
424 | static int cache_block_group(struct btrfs_block_group_cache *cache) | |
425 | { | |
11833d66 YZ |
426 | struct btrfs_fs_info *fs_info = cache->fs_info; |
427 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
428 | struct task_struct *tsk; |
429 | int ret = 0; | |
430 | ||
11833d66 YZ |
431 | smp_mb(); |
432 | if (cache->cached != BTRFS_CACHE_NO) | |
433 | return 0; | |
434 | ||
435 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_KERNEL); | |
436 | BUG_ON(!caching_ctl); | |
437 | ||
438 | INIT_LIST_HEAD(&caching_ctl->list); | |
439 | mutex_init(&caching_ctl->mutex); | |
440 | init_waitqueue_head(&caching_ctl->wait); | |
441 | caching_ctl->block_group = cache; | |
442 | caching_ctl->progress = cache->key.objectid; | |
443 | /* one for caching kthread, one for caching block group list */ | |
444 | atomic_set(&caching_ctl->count, 2); | |
445 | ||
817d52f8 JB |
446 | spin_lock(&cache->lock); |
447 | if (cache->cached != BTRFS_CACHE_NO) { | |
448 | spin_unlock(&cache->lock); | |
11833d66 YZ |
449 | kfree(caching_ctl); |
450 | return 0; | |
817d52f8 | 451 | } |
11833d66 | 452 | cache->caching_ctl = caching_ctl; |
817d52f8 JB |
453 | cache->cached = BTRFS_CACHE_STARTED; |
454 | spin_unlock(&cache->lock); | |
455 | ||
11833d66 YZ |
456 | down_write(&fs_info->extent_commit_sem); |
457 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); | |
458 | up_write(&fs_info->extent_commit_sem); | |
459 | ||
460 | atomic_inc(&cache->space_info->caching_threads); | |
11dfe35a | 461 | btrfs_get_block_group(cache); |
11833d66 | 462 | |
817d52f8 JB |
463 | tsk = kthread_run(caching_kthread, cache, "btrfs-cache-%llu\n", |
464 | cache->key.objectid); | |
465 | if (IS_ERR(tsk)) { | |
466 | ret = PTR_ERR(tsk); | |
467 | printk(KERN_ERR "error running thread %d\n", ret); | |
468 | BUG(); | |
469 | } | |
470 | ||
ef8bbdfe | 471 | return ret; |
e37c9e69 CM |
472 | } |
473 | ||
0f9dd46c JB |
474 | /* |
475 | * return the block group that starts at or after bytenr | |
476 | */ | |
d397712b CM |
477 | static struct btrfs_block_group_cache * |
478 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 479 | { |
0f9dd46c | 480 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 481 | |
0f9dd46c | 482 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 483 | |
0f9dd46c | 484 | return cache; |
0ef3e66b CM |
485 | } |
486 | ||
0f9dd46c | 487 | /* |
9f55684c | 488 | * return the block group that contains the given bytenr |
0f9dd46c | 489 | */ |
d397712b CM |
490 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
491 | struct btrfs_fs_info *info, | |
492 | u64 bytenr) | |
be744175 | 493 | { |
0f9dd46c | 494 | struct btrfs_block_group_cache *cache; |
be744175 | 495 | |
0f9dd46c | 496 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 497 | |
0f9dd46c | 498 | return cache; |
be744175 | 499 | } |
0b86a832 | 500 | |
0f9dd46c JB |
501 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
502 | u64 flags) | |
6324fbf3 | 503 | { |
0f9dd46c | 504 | struct list_head *head = &info->space_info; |
0f9dd46c | 505 | struct btrfs_space_info *found; |
4184ea7f | 506 | |
b742bb82 YZ |
507 | flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM | |
508 | BTRFS_BLOCK_GROUP_METADATA; | |
509 | ||
4184ea7f CM |
510 | rcu_read_lock(); |
511 | list_for_each_entry_rcu(found, head, list) { | |
512 | if (found->flags == flags) { | |
513 | rcu_read_unlock(); | |
0f9dd46c | 514 | return found; |
4184ea7f | 515 | } |
0f9dd46c | 516 | } |
4184ea7f | 517 | rcu_read_unlock(); |
0f9dd46c | 518 | return NULL; |
6324fbf3 CM |
519 | } |
520 | ||
4184ea7f CM |
521 | /* |
522 | * after adding space to the filesystem, we need to clear the full flags | |
523 | * on all the space infos. | |
524 | */ | |
525 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
526 | { | |
527 | struct list_head *head = &info->space_info; | |
528 | struct btrfs_space_info *found; | |
529 | ||
530 | rcu_read_lock(); | |
531 | list_for_each_entry_rcu(found, head, list) | |
532 | found->full = 0; | |
533 | rcu_read_unlock(); | |
534 | } | |
535 | ||
80eb234a JB |
536 | static u64 div_factor(u64 num, int factor) |
537 | { | |
538 | if (factor == 10) | |
539 | return num; | |
540 | num *= factor; | |
541 | do_div(num, 10); | |
542 | return num; | |
543 | } | |
544 | ||
d2fb3437 YZ |
545 | u64 btrfs_find_block_group(struct btrfs_root *root, |
546 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 547 | { |
96b5179d | 548 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 549 | u64 used; |
d2fb3437 YZ |
550 | u64 last = max(search_hint, search_start); |
551 | u64 group_start = 0; | |
31f3c99b | 552 | int full_search = 0; |
d2fb3437 | 553 | int factor = 9; |
0ef3e66b | 554 | int wrapped = 0; |
31f3c99b | 555 | again: |
e8569813 ZY |
556 | while (1) { |
557 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
558 | if (!cache) |
559 | break; | |
96b5179d | 560 | |
c286ac48 | 561 | spin_lock(&cache->lock); |
96b5179d CM |
562 | last = cache->key.objectid + cache->key.offset; |
563 | used = btrfs_block_group_used(&cache->item); | |
564 | ||
d2fb3437 YZ |
565 | if ((full_search || !cache->ro) && |
566 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 567 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
568 | div_factor(cache->key.offset, factor)) { |
569 | group_start = cache->key.objectid; | |
c286ac48 | 570 | spin_unlock(&cache->lock); |
fa9c0d79 | 571 | btrfs_put_block_group(cache); |
8790d502 CM |
572 | goto found; |
573 | } | |
6324fbf3 | 574 | } |
c286ac48 | 575 | spin_unlock(&cache->lock); |
fa9c0d79 | 576 | btrfs_put_block_group(cache); |
de428b63 | 577 | cond_resched(); |
cd1bc465 | 578 | } |
0ef3e66b CM |
579 | if (!wrapped) { |
580 | last = search_start; | |
581 | wrapped = 1; | |
582 | goto again; | |
583 | } | |
584 | if (!full_search && factor < 10) { | |
be744175 | 585 | last = search_start; |
31f3c99b | 586 | full_search = 1; |
0ef3e66b | 587 | factor = 10; |
31f3c99b CM |
588 | goto again; |
589 | } | |
be744175 | 590 | found: |
d2fb3437 | 591 | return group_start; |
925baedd | 592 | } |
0f9dd46c | 593 | |
e02119d5 | 594 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 595 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
596 | { |
597 | int ret; | |
598 | struct btrfs_key key; | |
31840ae1 | 599 | struct btrfs_path *path; |
e02119d5 | 600 | |
31840ae1 ZY |
601 | path = btrfs_alloc_path(); |
602 | BUG_ON(!path); | |
e02119d5 CM |
603 | key.objectid = start; |
604 | key.offset = len; | |
605 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
606 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
607 | 0, 0); | |
31840ae1 | 608 | btrfs_free_path(path); |
7bb86316 CM |
609 | return ret; |
610 | } | |
611 | ||
a22285a6 YZ |
612 | /* |
613 | * helper function to lookup reference count and flags of extent. | |
614 | * | |
615 | * the head node for delayed ref is used to store the sum of all the | |
616 | * reference count modifications queued up in the rbtree. the head | |
617 | * node may also store the extent flags to set. This way you can check | |
618 | * to see what the reference count and extent flags would be if all of | |
619 | * the delayed refs are not processed. | |
620 | */ | |
621 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
622 | struct btrfs_root *root, u64 bytenr, | |
623 | u64 num_bytes, u64 *refs, u64 *flags) | |
624 | { | |
625 | struct btrfs_delayed_ref_head *head; | |
626 | struct btrfs_delayed_ref_root *delayed_refs; | |
627 | struct btrfs_path *path; | |
628 | struct btrfs_extent_item *ei; | |
629 | struct extent_buffer *leaf; | |
630 | struct btrfs_key key; | |
631 | u32 item_size; | |
632 | u64 num_refs; | |
633 | u64 extent_flags; | |
634 | int ret; | |
635 | ||
636 | path = btrfs_alloc_path(); | |
637 | if (!path) | |
638 | return -ENOMEM; | |
639 | ||
640 | key.objectid = bytenr; | |
641 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
642 | key.offset = num_bytes; | |
643 | if (!trans) { | |
644 | path->skip_locking = 1; | |
645 | path->search_commit_root = 1; | |
646 | } | |
647 | again: | |
648 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
649 | &key, path, 0, 0); | |
650 | if (ret < 0) | |
651 | goto out_free; | |
652 | ||
653 | if (ret == 0) { | |
654 | leaf = path->nodes[0]; | |
655 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
656 | if (item_size >= sizeof(*ei)) { | |
657 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
658 | struct btrfs_extent_item); | |
659 | num_refs = btrfs_extent_refs(leaf, ei); | |
660 | extent_flags = btrfs_extent_flags(leaf, ei); | |
661 | } else { | |
662 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
663 | struct btrfs_extent_item_v0 *ei0; | |
664 | BUG_ON(item_size != sizeof(*ei0)); | |
665 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
666 | struct btrfs_extent_item_v0); | |
667 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
668 | /* FIXME: this isn't correct for data */ | |
669 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
670 | #else | |
671 | BUG(); | |
672 | #endif | |
673 | } | |
674 | BUG_ON(num_refs == 0); | |
675 | } else { | |
676 | num_refs = 0; | |
677 | extent_flags = 0; | |
678 | ret = 0; | |
679 | } | |
680 | ||
681 | if (!trans) | |
682 | goto out; | |
683 | ||
684 | delayed_refs = &trans->transaction->delayed_refs; | |
685 | spin_lock(&delayed_refs->lock); | |
686 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
687 | if (head) { | |
688 | if (!mutex_trylock(&head->mutex)) { | |
689 | atomic_inc(&head->node.refs); | |
690 | spin_unlock(&delayed_refs->lock); | |
691 | ||
692 | btrfs_release_path(root->fs_info->extent_root, path); | |
693 | ||
694 | mutex_lock(&head->mutex); | |
695 | mutex_unlock(&head->mutex); | |
696 | btrfs_put_delayed_ref(&head->node); | |
697 | goto again; | |
698 | } | |
699 | if (head->extent_op && head->extent_op->update_flags) | |
700 | extent_flags |= head->extent_op->flags_to_set; | |
701 | else | |
702 | BUG_ON(num_refs == 0); | |
703 | ||
704 | num_refs += head->node.ref_mod; | |
705 | mutex_unlock(&head->mutex); | |
706 | } | |
707 | spin_unlock(&delayed_refs->lock); | |
708 | out: | |
709 | WARN_ON(num_refs == 0); | |
710 | if (refs) | |
711 | *refs = num_refs; | |
712 | if (flags) | |
713 | *flags = extent_flags; | |
714 | out_free: | |
715 | btrfs_free_path(path); | |
716 | return ret; | |
717 | } | |
718 | ||
d8d5f3e1 CM |
719 | /* |
720 | * Back reference rules. Back refs have three main goals: | |
721 | * | |
722 | * 1) differentiate between all holders of references to an extent so that | |
723 | * when a reference is dropped we can make sure it was a valid reference | |
724 | * before freeing the extent. | |
725 | * | |
726 | * 2) Provide enough information to quickly find the holders of an extent | |
727 | * if we notice a given block is corrupted or bad. | |
728 | * | |
729 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
730 | * maintenance. This is actually the same as #2, but with a slightly | |
731 | * different use case. | |
732 | * | |
5d4f98a2 YZ |
733 | * There are two kinds of back refs. The implicit back refs is optimized |
734 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
735 | * back refs of this kind provide information about the block's owner tree | |
736 | * and the pointer's key. These information allow us to find the block by | |
737 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
738 | * referenced by their owner trees. The location of tree block is recorded | |
739 | * in the back refs. Actually the full back refs is generic, and can be | |
740 | * used in all cases the implicit back refs is used. The major shortcoming | |
741 | * of the full back refs is its overhead. Every time a tree block gets | |
742 | * COWed, we have to update back refs entry for all pointers in it. | |
743 | * | |
744 | * For a newly allocated tree block, we use implicit back refs for | |
745 | * pointers in it. This means most tree related operations only involve | |
746 | * implicit back refs. For a tree block created in old transaction, the | |
747 | * only way to drop a reference to it is COW it. So we can detect the | |
748 | * event that tree block loses its owner tree's reference and do the | |
749 | * back refs conversion. | |
750 | * | |
751 | * When a tree block is COW'd through a tree, there are four cases: | |
752 | * | |
753 | * The reference count of the block is one and the tree is the block's | |
754 | * owner tree. Nothing to do in this case. | |
755 | * | |
756 | * The reference count of the block is one and the tree is not the | |
757 | * block's owner tree. In this case, full back refs is used for pointers | |
758 | * in the block. Remove these full back refs, add implicit back refs for | |
759 | * every pointers in the new block. | |
760 | * | |
761 | * The reference count of the block is greater than one and the tree is | |
762 | * the block's owner tree. In this case, implicit back refs is used for | |
763 | * pointers in the block. Add full back refs for every pointers in the | |
764 | * block, increase lower level extents' reference counts. The original | |
765 | * implicit back refs are entailed to the new block. | |
766 | * | |
767 | * The reference count of the block is greater than one and the tree is | |
768 | * not the block's owner tree. Add implicit back refs for every pointer in | |
769 | * the new block, increase lower level extents' reference count. | |
770 | * | |
771 | * Back Reference Key composing: | |
772 | * | |
773 | * The key objectid corresponds to the first byte in the extent, | |
774 | * The key type is used to differentiate between types of back refs. | |
775 | * There are different meanings of the key offset for different types | |
776 | * of back refs. | |
777 | * | |
d8d5f3e1 CM |
778 | * File extents can be referenced by: |
779 | * | |
780 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 781 | * - different files inside a single subvolume |
d8d5f3e1 CM |
782 | * - different offsets inside a file (bookend extents in file.c) |
783 | * | |
5d4f98a2 | 784 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
785 | * |
786 | * - Objectid of the subvolume root | |
d8d5f3e1 | 787 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
788 | * - original offset in the file |
789 | * - how many bookend extents | |
d8d5f3e1 | 790 | * |
5d4f98a2 YZ |
791 | * The key offset for the implicit back refs is hash of the first |
792 | * three fields. | |
d8d5f3e1 | 793 | * |
5d4f98a2 | 794 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 795 | * |
5d4f98a2 | 796 | * - number of pointers in the tree leaf |
d8d5f3e1 | 797 | * |
5d4f98a2 YZ |
798 | * The key offset for the implicit back refs is the first byte of |
799 | * the tree leaf | |
d8d5f3e1 | 800 | * |
5d4f98a2 YZ |
801 | * When a file extent is allocated, The implicit back refs is used. |
802 | * the fields are filled in: | |
d8d5f3e1 | 803 | * |
5d4f98a2 | 804 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 805 | * |
5d4f98a2 YZ |
806 | * When a file extent is removed file truncation, we find the |
807 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 808 | * |
5d4f98a2 | 809 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 810 | * |
5d4f98a2 | 811 | * Btree extents can be referenced by: |
d8d5f3e1 | 812 | * |
5d4f98a2 | 813 | * - Different subvolumes |
d8d5f3e1 | 814 | * |
5d4f98a2 YZ |
815 | * Both the implicit back refs and the full back refs for tree blocks |
816 | * only consist of key. The key offset for the implicit back refs is | |
817 | * objectid of block's owner tree. The key offset for the full back refs | |
818 | * is the first byte of parent block. | |
d8d5f3e1 | 819 | * |
5d4f98a2 YZ |
820 | * When implicit back refs is used, information about the lowest key and |
821 | * level of the tree block are required. These information are stored in | |
822 | * tree block info structure. | |
d8d5f3e1 | 823 | */ |
31840ae1 | 824 | |
5d4f98a2 YZ |
825 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
826 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
827 | struct btrfs_root *root, | |
828 | struct btrfs_path *path, | |
829 | u64 owner, u32 extra_size) | |
7bb86316 | 830 | { |
5d4f98a2 YZ |
831 | struct btrfs_extent_item *item; |
832 | struct btrfs_extent_item_v0 *ei0; | |
833 | struct btrfs_extent_ref_v0 *ref0; | |
834 | struct btrfs_tree_block_info *bi; | |
835 | struct extent_buffer *leaf; | |
7bb86316 | 836 | struct btrfs_key key; |
5d4f98a2 YZ |
837 | struct btrfs_key found_key; |
838 | u32 new_size = sizeof(*item); | |
839 | u64 refs; | |
840 | int ret; | |
841 | ||
842 | leaf = path->nodes[0]; | |
843 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
844 | ||
845 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
846 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
847 | struct btrfs_extent_item_v0); | |
848 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
849 | ||
850 | if (owner == (u64)-1) { | |
851 | while (1) { | |
852 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
853 | ret = btrfs_next_leaf(root, path); | |
854 | if (ret < 0) | |
855 | return ret; | |
856 | BUG_ON(ret > 0); | |
857 | leaf = path->nodes[0]; | |
858 | } | |
859 | btrfs_item_key_to_cpu(leaf, &found_key, | |
860 | path->slots[0]); | |
861 | BUG_ON(key.objectid != found_key.objectid); | |
862 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
863 | path->slots[0]++; | |
864 | continue; | |
865 | } | |
866 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
867 | struct btrfs_extent_ref_v0); | |
868 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
869 | break; | |
870 | } | |
871 | } | |
872 | btrfs_release_path(root, path); | |
873 | ||
874 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
875 | new_size += sizeof(*bi); | |
876 | ||
877 | new_size -= sizeof(*ei0); | |
878 | ret = btrfs_search_slot(trans, root, &key, path, | |
879 | new_size + extra_size, 1); | |
880 | if (ret < 0) | |
881 | return ret; | |
882 | BUG_ON(ret); | |
883 | ||
884 | ret = btrfs_extend_item(trans, root, path, new_size); | |
885 | BUG_ON(ret); | |
886 | ||
887 | leaf = path->nodes[0]; | |
888 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
889 | btrfs_set_extent_refs(leaf, item, refs); | |
890 | /* FIXME: get real generation */ | |
891 | btrfs_set_extent_generation(leaf, item, 0); | |
892 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
893 | btrfs_set_extent_flags(leaf, item, | |
894 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
895 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
896 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
897 | /* FIXME: get first key of the block */ | |
898 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
899 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
900 | } else { | |
901 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
902 | } | |
903 | btrfs_mark_buffer_dirty(leaf); | |
904 | return 0; | |
905 | } | |
906 | #endif | |
907 | ||
908 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
909 | { | |
910 | u32 high_crc = ~(u32)0; | |
911 | u32 low_crc = ~(u32)0; | |
912 | __le64 lenum; | |
913 | ||
914 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 915 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 916 | lenum = cpu_to_le64(owner); |
163e783e | 917 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 918 | lenum = cpu_to_le64(offset); |
163e783e | 919 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
920 | |
921 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
922 | } | |
923 | ||
924 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
925 | struct btrfs_extent_data_ref *ref) | |
926 | { | |
927 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
928 | btrfs_extent_data_ref_objectid(leaf, ref), | |
929 | btrfs_extent_data_ref_offset(leaf, ref)); | |
930 | } | |
931 | ||
932 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
933 | struct btrfs_extent_data_ref *ref, | |
934 | u64 root_objectid, u64 owner, u64 offset) | |
935 | { | |
936 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
937 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
938 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
939 | return 0; | |
940 | return 1; | |
941 | } | |
942 | ||
943 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
944 | struct btrfs_root *root, | |
945 | struct btrfs_path *path, | |
946 | u64 bytenr, u64 parent, | |
947 | u64 root_objectid, | |
948 | u64 owner, u64 offset) | |
949 | { | |
950 | struct btrfs_key key; | |
951 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 952 | struct extent_buffer *leaf; |
5d4f98a2 | 953 | u32 nritems; |
74493f7a | 954 | int ret; |
5d4f98a2 YZ |
955 | int recow; |
956 | int err = -ENOENT; | |
74493f7a | 957 | |
31840ae1 | 958 | key.objectid = bytenr; |
5d4f98a2 YZ |
959 | if (parent) { |
960 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
961 | key.offset = parent; | |
962 | } else { | |
963 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
964 | key.offset = hash_extent_data_ref(root_objectid, | |
965 | owner, offset); | |
966 | } | |
967 | again: | |
968 | recow = 0; | |
969 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
970 | if (ret < 0) { | |
971 | err = ret; | |
972 | goto fail; | |
973 | } | |
31840ae1 | 974 | |
5d4f98a2 YZ |
975 | if (parent) { |
976 | if (!ret) | |
977 | return 0; | |
978 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
979 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
980 | btrfs_release_path(root, path); | |
981 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
982 | if (ret < 0) { | |
983 | err = ret; | |
984 | goto fail; | |
985 | } | |
986 | if (!ret) | |
987 | return 0; | |
988 | #endif | |
989 | goto fail; | |
31840ae1 ZY |
990 | } |
991 | ||
992 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
993 | nritems = btrfs_header_nritems(leaf); |
994 | while (1) { | |
995 | if (path->slots[0] >= nritems) { | |
996 | ret = btrfs_next_leaf(root, path); | |
997 | if (ret < 0) | |
998 | err = ret; | |
999 | if (ret) | |
1000 | goto fail; | |
1001 | ||
1002 | leaf = path->nodes[0]; | |
1003 | nritems = btrfs_header_nritems(leaf); | |
1004 | recow = 1; | |
1005 | } | |
1006 | ||
1007 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1008 | if (key.objectid != bytenr || | |
1009 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1010 | goto fail; | |
1011 | ||
1012 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1013 | struct btrfs_extent_data_ref); | |
1014 | ||
1015 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1016 | owner, offset)) { | |
1017 | if (recow) { | |
1018 | btrfs_release_path(root, path); | |
1019 | goto again; | |
1020 | } | |
1021 | err = 0; | |
1022 | break; | |
1023 | } | |
1024 | path->slots[0]++; | |
31840ae1 | 1025 | } |
5d4f98a2 YZ |
1026 | fail: |
1027 | return err; | |
31840ae1 ZY |
1028 | } |
1029 | ||
5d4f98a2 YZ |
1030 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1031 | struct btrfs_root *root, | |
1032 | struct btrfs_path *path, | |
1033 | u64 bytenr, u64 parent, | |
1034 | u64 root_objectid, u64 owner, | |
1035 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1036 | { |
1037 | struct btrfs_key key; | |
1038 | struct extent_buffer *leaf; | |
5d4f98a2 | 1039 | u32 size; |
31840ae1 ZY |
1040 | u32 num_refs; |
1041 | int ret; | |
74493f7a | 1042 | |
74493f7a | 1043 | key.objectid = bytenr; |
5d4f98a2 YZ |
1044 | if (parent) { |
1045 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1046 | key.offset = parent; | |
1047 | size = sizeof(struct btrfs_shared_data_ref); | |
1048 | } else { | |
1049 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1050 | key.offset = hash_extent_data_ref(root_objectid, | |
1051 | owner, offset); | |
1052 | size = sizeof(struct btrfs_extent_data_ref); | |
1053 | } | |
74493f7a | 1054 | |
5d4f98a2 YZ |
1055 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1056 | if (ret && ret != -EEXIST) | |
1057 | goto fail; | |
1058 | ||
1059 | leaf = path->nodes[0]; | |
1060 | if (parent) { | |
1061 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1062 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1063 | struct btrfs_shared_data_ref); |
1064 | if (ret == 0) { | |
1065 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1066 | } else { | |
1067 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1068 | num_refs += refs_to_add; | |
1069 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1070 | } |
5d4f98a2 YZ |
1071 | } else { |
1072 | struct btrfs_extent_data_ref *ref; | |
1073 | while (ret == -EEXIST) { | |
1074 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1075 | struct btrfs_extent_data_ref); | |
1076 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1077 | owner, offset)) | |
1078 | break; | |
1079 | btrfs_release_path(root, path); | |
1080 | key.offset++; | |
1081 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1082 | size); | |
1083 | if (ret && ret != -EEXIST) | |
1084 | goto fail; | |
31840ae1 | 1085 | |
5d4f98a2 YZ |
1086 | leaf = path->nodes[0]; |
1087 | } | |
1088 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1089 | struct btrfs_extent_data_ref); | |
1090 | if (ret == 0) { | |
1091 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1092 | root_objectid); | |
1093 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1094 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1095 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1096 | } else { | |
1097 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1098 | num_refs += refs_to_add; | |
1099 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1100 | } |
31840ae1 | 1101 | } |
5d4f98a2 YZ |
1102 | btrfs_mark_buffer_dirty(leaf); |
1103 | ret = 0; | |
1104 | fail: | |
7bb86316 CM |
1105 | btrfs_release_path(root, path); |
1106 | return ret; | |
74493f7a CM |
1107 | } |
1108 | ||
5d4f98a2 YZ |
1109 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1110 | struct btrfs_root *root, | |
1111 | struct btrfs_path *path, | |
1112 | int refs_to_drop) | |
31840ae1 | 1113 | { |
5d4f98a2 YZ |
1114 | struct btrfs_key key; |
1115 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1116 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1117 | struct extent_buffer *leaf; |
5d4f98a2 | 1118 | u32 num_refs = 0; |
31840ae1 ZY |
1119 | int ret = 0; |
1120 | ||
1121 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1122 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1123 | ||
1124 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1125 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1126 | struct btrfs_extent_data_ref); | |
1127 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1128 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1129 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1130 | struct btrfs_shared_data_ref); | |
1131 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1132 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1133 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1134 | struct btrfs_extent_ref_v0 *ref0; | |
1135 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1136 | struct btrfs_extent_ref_v0); | |
1137 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1138 | #endif | |
1139 | } else { | |
1140 | BUG(); | |
1141 | } | |
1142 | ||
56bec294 CM |
1143 | BUG_ON(num_refs < refs_to_drop); |
1144 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1145 | |
31840ae1 ZY |
1146 | if (num_refs == 0) { |
1147 | ret = btrfs_del_item(trans, root, path); | |
1148 | } else { | |
5d4f98a2 YZ |
1149 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1150 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1151 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1152 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1153 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1154 | else { | |
1155 | struct btrfs_extent_ref_v0 *ref0; | |
1156 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1157 | struct btrfs_extent_ref_v0); | |
1158 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1159 | } | |
1160 | #endif | |
31840ae1 ZY |
1161 | btrfs_mark_buffer_dirty(leaf); |
1162 | } | |
31840ae1 ZY |
1163 | return ret; |
1164 | } | |
1165 | ||
5d4f98a2 YZ |
1166 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1167 | struct btrfs_path *path, | |
1168 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1169 | { |
5d4f98a2 YZ |
1170 | struct btrfs_key key; |
1171 | struct extent_buffer *leaf; | |
1172 | struct btrfs_extent_data_ref *ref1; | |
1173 | struct btrfs_shared_data_ref *ref2; | |
1174 | u32 num_refs = 0; | |
1175 | ||
1176 | leaf = path->nodes[0]; | |
1177 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1178 | if (iref) { | |
1179 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1180 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1181 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1182 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1183 | } else { | |
1184 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1185 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1186 | } | |
1187 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1188 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1189 | struct btrfs_extent_data_ref); | |
1190 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1191 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1192 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1193 | struct btrfs_shared_data_ref); | |
1194 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1195 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1196 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1197 | struct btrfs_extent_ref_v0 *ref0; | |
1198 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1199 | struct btrfs_extent_ref_v0); | |
1200 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1201 | #endif |
5d4f98a2 YZ |
1202 | } else { |
1203 | WARN_ON(1); | |
1204 | } | |
1205 | return num_refs; | |
1206 | } | |
15916de8 | 1207 | |
5d4f98a2 YZ |
1208 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1209 | struct btrfs_root *root, | |
1210 | struct btrfs_path *path, | |
1211 | u64 bytenr, u64 parent, | |
1212 | u64 root_objectid) | |
1f3c79a2 | 1213 | { |
5d4f98a2 | 1214 | struct btrfs_key key; |
1f3c79a2 | 1215 | int ret; |
1f3c79a2 | 1216 | |
5d4f98a2 YZ |
1217 | key.objectid = bytenr; |
1218 | if (parent) { | |
1219 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1220 | key.offset = parent; | |
1221 | } else { | |
1222 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1223 | key.offset = root_objectid; | |
1f3c79a2 LH |
1224 | } |
1225 | ||
5d4f98a2 YZ |
1226 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1227 | if (ret > 0) | |
1228 | ret = -ENOENT; | |
1229 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1230 | if (ret == -ENOENT && parent) { | |
1231 | btrfs_release_path(root, path); | |
1232 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1233 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1234 | if (ret > 0) | |
1235 | ret = -ENOENT; | |
1236 | } | |
1f3c79a2 | 1237 | #endif |
5d4f98a2 | 1238 | return ret; |
1f3c79a2 LH |
1239 | } |
1240 | ||
5d4f98a2 YZ |
1241 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1242 | struct btrfs_root *root, | |
1243 | struct btrfs_path *path, | |
1244 | u64 bytenr, u64 parent, | |
1245 | u64 root_objectid) | |
31840ae1 | 1246 | { |
5d4f98a2 | 1247 | struct btrfs_key key; |
31840ae1 | 1248 | int ret; |
31840ae1 | 1249 | |
5d4f98a2 YZ |
1250 | key.objectid = bytenr; |
1251 | if (parent) { | |
1252 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1253 | key.offset = parent; | |
1254 | } else { | |
1255 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1256 | key.offset = root_objectid; | |
1257 | } | |
1258 | ||
1259 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1260 | btrfs_release_path(root, path); | |
31840ae1 ZY |
1261 | return ret; |
1262 | } | |
1263 | ||
5d4f98a2 | 1264 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1265 | { |
5d4f98a2 YZ |
1266 | int type; |
1267 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1268 | if (parent > 0) | |
1269 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1270 | else | |
1271 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1272 | } else { | |
1273 | if (parent > 0) | |
1274 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1275 | else | |
1276 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1277 | } | |
1278 | return type; | |
31840ae1 | 1279 | } |
56bec294 | 1280 | |
2c47e605 YZ |
1281 | static int find_next_key(struct btrfs_path *path, int level, |
1282 | struct btrfs_key *key) | |
56bec294 | 1283 | |
02217ed2 | 1284 | { |
2c47e605 | 1285 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1286 | if (!path->nodes[level]) |
1287 | break; | |
5d4f98a2 YZ |
1288 | if (path->slots[level] + 1 >= |
1289 | btrfs_header_nritems(path->nodes[level])) | |
1290 | continue; | |
1291 | if (level == 0) | |
1292 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1293 | path->slots[level] + 1); | |
1294 | else | |
1295 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1296 | path->slots[level] + 1); | |
1297 | return 0; | |
1298 | } | |
1299 | return 1; | |
1300 | } | |
037e6390 | 1301 | |
5d4f98a2 YZ |
1302 | /* |
1303 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1304 | * to the address of inline back ref, and 0 is returned. | |
1305 | * | |
1306 | * if back ref isn't found, *ref_ret is set to the address where it | |
1307 | * should be inserted, and -ENOENT is returned. | |
1308 | * | |
1309 | * if insert is true and there are too many inline back refs, the path | |
1310 | * points to the extent item, and -EAGAIN is returned. | |
1311 | * | |
1312 | * NOTE: inline back refs are ordered in the same way that back ref | |
1313 | * items in the tree are ordered. | |
1314 | */ | |
1315 | static noinline_for_stack | |
1316 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1317 | struct btrfs_root *root, | |
1318 | struct btrfs_path *path, | |
1319 | struct btrfs_extent_inline_ref **ref_ret, | |
1320 | u64 bytenr, u64 num_bytes, | |
1321 | u64 parent, u64 root_objectid, | |
1322 | u64 owner, u64 offset, int insert) | |
1323 | { | |
1324 | struct btrfs_key key; | |
1325 | struct extent_buffer *leaf; | |
1326 | struct btrfs_extent_item *ei; | |
1327 | struct btrfs_extent_inline_ref *iref; | |
1328 | u64 flags; | |
1329 | u64 item_size; | |
1330 | unsigned long ptr; | |
1331 | unsigned long end; | |
1332 | int extra_size; | |
1333 | int type; | |
1334 | int want; | |
1335 | int ret; | |
1336 | int err = 0; | |
26b8003f | 1337 | |
db94535d | 1338 | key.objectid = bytenr; |
31840ae1 | 1339 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1340 | key.offset = num_bytes; |
31840ae1 | 1341 | |
5d4f98a2 YZ |
1342 | want = extent_ref_type(parent, owner); |
1343 | if (insert) { | |
1344 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1345 | path->keep_locks = 1; |
5d4f98a2 YZ |
1346 | } else |
1347 | extra_size = -1; | |
1348 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1349 | if (ret < 0) { |
5d4f98a2 YZ |
1350 | err = ret; |
1351 | goto out; | |
1352 | } | |
1353 | BUG_ON(ret); | |
1354 | ||
1355 | leaf = path->nodes[0]; | |
1356 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1357 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1358 | if (item_size < sizeof(*ei)) { | |
1359 | if (!insert) { | |
1360 | err = -ENOENT; | |
1361 | goto out; | |
1362 | } | |
1363 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1364 | extra_size); | |
1365 | if (ret < 0) { | |
1366 | err = ret; | |
1367 | goto out; | |
1368 | } | |
1369 | leaf = path->nodes[0]; | |
1370 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1371 | } | |
1372 | #endif | |
1373 | BUG_ON(item_size < sizeof(*ei)); | |
1374 | ||
5d4f98a2 YZ |
1375 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1376 | flags = btrfs_extent_flags(leaf, ei); | |
1377 | ||
1378 | ptr = (unsigned long)(ei + 1); | |
1379 | end = (unsigned long)ei + item_size; | |
1380 | ||
1381 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1382 | ptr += sizeof(struct btrfs_tree_block_info); | |
1383 | BUG_ON(ptr > end); | |
1384 | } else { | |
1385 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1386 | } | |
1387 | ||
1388 | err = -ENOENT; | |
1389 | while (1) { | |
1390 | if (ptr >= end) { | |
1391 | WARN_ON(ptr > end); | |
1392 | break; | |
1393 | } | |
1394 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1395 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1396 | if (want < type) | |
1397 | break; | |
1398 | if (want > type) { | |
1399 | ptr += btrfs_extent_inline_ref_size(type); | |
1400 | continue; | |
1401 | } | |
1402 | ||
1403 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1404 | struct btrfs_extent_data_ref *dref; | |
1405 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1406 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1407 | owner, offset)) { | |
1408 | err = 0; | |
1409 | break; | |
1410 | } | |
1411 | if (hash_extent_data_ref_item(leaf, dref) < | |
1412 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1413 | break; | |
1414 | } else { | |
1415 | u64 ref_offset; | |
1416 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1417 | if (parent > 0) { | |
1418 | if (parent == ref_offset) { | |
1419 | err = 0; | |
1420 | break; | |
1421 | } | |
1422 | if (ref_offset < parent) | |
1423 | break; | |
1424 | } else { | |
1425 | if (root_objectid == ref_offset) { | |
1426 | err = 0; | |
1427 | break; | |
1428 | } | |
1429 | if (ref_offset < root_objectid) | |
1430 | break; | |
1431 | } | |
1432 | } | |
1433 | ptr += btrfs_extent_inline_ref_size(type); | |
1434 | } | |
1435 | if (err == -ENOENT && insert) { | |
1436 | if (item_size + extra_size >= | |
1437 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1438 | err = -EAGAIN; | |
1439 | goto out; | |
1440 | } | |
1441 | /* | |
1442 | * To add new inline back ref, we have to make sure | |
1443 | * there is no corresponding back ref item. | |
1444 | * For simplicity, we just do not add new inline back | |
1445 | * ref if there is any kind of item for this block | |
1446 | */ | |
2c47e605 YZ |
1447 | if (find_next_key(path, 0, &key) == 0 && |
1448 | key.objectid == bytenr && | |
85d4198e | 1449 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1450 | err = -EAGAIN; |
1451 | goto out; | |
1452 | } | |
1453 | } | |
1454 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1455 | out: | |
85d4198e | 1456 | if (insert) { |
5d4f98a2 YZ |
1457 | path->keep_locks = 0; |
1458 | btrfs_unlock_up_safe(path, 1); | |
1459 | } | |
1460 | return err; | |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * helper to add new inline back ref | |
1465 | */ | |
1466 | static noinline_for_stack | |
1467 | int setup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1468 | struct btrfs_root *root, | |
1469 | struct btrfs_path *path, | |
1470 | struct btrfs_extent_inline_ref *iref, | |
1471 | u64 parent, u64 root_objectid, | |
1472 | u64 owner, u64 offset, int refs_to_add, | |
1473 | struct btrfs_delayed_extent_op *extent_op) | |
1474 | { | |
1475 | struct extent_buffer *leaf; | |
1476 | struct btrfs_extent_item *ei; | |
1477 | unsigned long ptr; | |
1478 | unsigned long end; | |
1479 | unsigned long item_offset; | |
1480 | u64 refs; | |
1481 | int size; | |
1482 | int type; | |
1483 | int ret; | |
1484 | ||
1485 | leaf = path->nodes[0]; | |
1486 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1487 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1488 | ||
1489 | type = extent_ref_type(parent, owner); | |
1490 | size = btrfs_extent_inline_ref_size(type); | |
1491 | ||
1492 | ret = btrfs_extend_item(trans, root, path, size); | |
1493 | BUG_ON(ret); | |
1494 | ||
1495 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1496 | refs = btrfs_extent_refs(leaf, ei); | |
1497 | refs += refs_to_add; | |
1498 | btrfs_set_extent_refs(leaf, ei, refs); | |
1499 | if (extent_op) | |
1500 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1501 | ||
1502 | ptr = (unsigned long)ei + item_offset; | |
1503 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1504 | if (ptr < end - size) | |
1505 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1506 | end - size - ptr); | |
1507 | ||
1508 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1509 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1510 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1511 | struct btrfs_extent_data_ref *dref; | |
1512 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1513 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1514 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1515 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1516 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1517 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1518 | struct btrfs_shared_data_ref *sref; | |
1519 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1520 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1521 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1522 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1523 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1524 | } else { | |
1525 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1526 | } | |
1527 | btrfs_mark_buffer_dirty(leaf); | |
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1532 | struct btrfs_root *root, | |
1533 | struct btrfs_path *path, | |
1534 | struct btrfs_extent_inline_ref **ref_ret, | |
1535 | u64 bytenr, u64 num_bytes, u64 parent, | |
1536 | u64 root_objectid, u64 owner, u64 offset) | |
1537 | { | |
1538 | int ret; | |
1539 | ||
1540 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1541 | bytenr, num_bytes, parent, | |
1542 | root_objectid, owner, offset, 0); | |
1543 | if (ret != -ENOENT) | |
54aa1f4d | 1544 | return ret; |
5d4f98a2 YZ |
1545 | |
1546 | btrfs_release_path(root, path); | |
1547 | *ref_ret = NULL; | |
1548 | ||
1549 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1550 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1551 | root_objectid); | |
1552 | } else { | |
1553 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1554 | root_objectid, owner, offset); | |
b9473439 | 1555 | } |
5d4f98a2 YZ |
1556 | return ret; |
1557 | } | |
31840ae1 | 1558 | |
5d4f98a2 YZ |
1559 | /* |
1560 | * helper to update/remove inline back ref | |
1561 | */ | |
1562 | static noinline_for_stack | |
1563 | int update_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1564 | struct btrfs_root *root, | |
1565 | struct btrfs_path *path, | |
1566 | struct btrfs_extent_inline_ref *iref, | |
1567 | int refs_to_mod, | |
1568 | struct btrfs_delayed_extent_op *extent_op) | |
1569 | { | |
1570 | struct extent_buffer *leaf; | |
1571 | struct btrfs_extent_item *ei; | |
1572 | struct btrfs_extent_data_ref *dref = NULL; | |
1573 | struct btrfs_shared_data_ref *sref = NULL; | |
1574 | unsigned long ptr; | |
1575 | unsigned long end; | |
1576 | u32 item_size; | |
1577 | int size; | |
1578 | int type; | |
1579 | int ret; | |
1580 | u64 refs; | |
1581 | ||
1582 | leaf = path->nodes[0]; | |
1583 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1584 | refs = btrfs_extent_refs(leaf, ei); | |
1585 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1586 | refs += refs_to_mod; | |
1587 | btrfs_set_extent_refs(leaf, ei, refs); | |
1588 | if (extent_op) | |
1589 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1590 | ||
1591 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1592 | ||
1593 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1594 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1595 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1596 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1597 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1598 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1599 | } else { | |
1600 | refs = 1; | |
1601 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1602 | } |
31840ae1 | 1603 | |
5d4f98a2 YZ |
1604 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1605 | refs += refs_to_mod; | |
1606 | ||
1607 | if (refs > 0) { | |
1608 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1609 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1610 | else | |
1611 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1612 | } else { | |
1613 | size = btrfs_extent_inline_ref_size(type); | |
1614 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1615 | ptr = (unsigned long)iref; | |
1616 | end = (unsigned long)ei + item_size; | |
1617 | if (ptr + size < end) | |
1618 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1619 | end - ptr - size); | |
1620 | item_size -= size; | |
1621 | ret = btrfs_truncate_item(trans, root, path, item_size, 1); | |
1622 | BUG_ON(ret); | |
1623 | } | |
1624 | btrfs_mark_buffer_dirty(leaf); | |
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | static noinline_for_stack | |
1629 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1630 | struct btrfs_root *root, | |
1631 | struct btrfs_path *path, | |
1632 | u64 bytenr, u64 num_bytes, u64 parent, | |
1633 | u64 root_objectid, u64 owner, | |
1634 | u64 offset, int refs_to_add, | |
1635 | struct btrfs_delayed_extent_op *extent_op) | |
1636 | { | |
1637 | struct btrfs_extent_inline_ref *iref; | |
1638 | int ret; | |
1639 | ||
1640 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1641 | bytenr, num_bytes, parent, | |
1642 | root_objectid, owner, offset, 1); | |
1643 | if (ret == 0) { | |
1644 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1645 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1646 | refs_to_add, extent_op); | |
1647 | } else if (ret == -ENOENT) { | |
1648 | ret = setup_inline_extent_backref(trans, root, path, iref, | |
1649 | parent, root_objectid, | |
1650 | owner, offset, refs_to_add, | |
1651 | extent_op); | |
771ed689 | 1652 | } |
5d4f98a2 YZ |
1653 | return ret; |
1654 | } | |
31840ae1 | 1655 | |
5d4f98a2 YZ |
1656 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1657 | struct btrfs_root *root, | |
1658 | struct btrfs_path *path, | |
1659 | u64 bytenr, u64 parent, u64 root_objectid, | |
1660 | u64 owner, u64 offset, int refs_to_add) | |
1661 | { | |
1662 | int ret; | |
1663 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1664 | BUG_ON(refs_to_add != 1); | |
1665 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1666 | parent, root_objectid); | |
1667 | } else { | |
1668 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1669 | parent, root_objectid, | |
1670 | owner, offset, refs_to_add); | |
1671 | } | |
1672 | return ret; | |
1673 | } | |
56bec294 | 1674 | |
5d4f98a2 YZ |
1675 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1676 | struct btrfs_root *root, | |
1677 | struct btrfs_path *path, | |
1678 | struct btrfs_extent_inline_ref *iref, | |
1679 | int refs_to_drop, int is_data) | |
1680 | { | |
1681 | int ret; | |
b9473439 | 1682 | |
5d4f98a2 YZ |
1683 | BUG_ON(!is_data && refs_to_drop != 1); |
1684 | if (iref) { | |
1685 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1686 | -refs_to_drop, NULL); | |
1687 | } else if (is_data) { | |
1688 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1689 | } else { | |
1690 | ret = btrfs_del_item(trans, root, path); | |
1691 | } | |
1692 | return ret; | |
1693 | } | |
1694 | ||
5d4f98a2 YZ |
1695 | static void btrfs_issue_discard(struct block_device *bdev, |
1696 | u64 start, u64 len) | |
1697 | { | |
746cd1e7 CH |
1698 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL, |
1699 | DISCARD_FL_BARRIER); | |
5d4f98a2 | 1700 | } |
5d4f98a2 YZ |
1701 | |
1702 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
1703 | u64 num_bytes) | |
1704 | { | |
5d4f98a2 YZ |
1705 | int ret; |
1706 | u64 map_length = num_bytes; | |
1707 | struct btrfs_multi_bio *multi = NULL; | |
1708 | ||
e244a0ae CH |
1709 | if (!btrfs_test_opt(root, DISCARD)) |
1710 | return 0; | |
1711 | ||
5d4f98a2 YZ |
1712 | /* Tell the block device(s) that the sectors can be discarded */ |
1713 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
1714 | bytenr, &map_length, &multi, 0); | |
1715 | if (!ret) { | |
1716 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
1717 | int i; | |
1718 | ||
1719 | if (map_length > num_bytes) | |
1720 | map_length = num_bytes; | |
1721 | ||
1722 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
1723 | btrfs_issue_discard(stripe->dev->bdev, | |
1724 | stripe->physical, | |
1725 | map_length); | |
1726 | } | |
1727 | kfree(multi); | |
1728 | } | |
1729 | ||
1730 | return ret; | |
5d4f98a2 YZ |
1731 | } |
1732 | ||
1733 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1734 | struct btrfs_root *root, | |
1735 | u64 bytenr, u64 num_bytes, u64 parent, | |
1736 | u64 root_objectid, u64 owner, u64 offset) | |
1737 | { | |
1738 | int ret; | |
1739 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1740 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1741 | ||
1742 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1743 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
1744 | parent, root_objectid, (int)owner, | |
1745 | BTRFS_ADD_DELAYED_REF, NULL); | |
1746 | } else { | |
1747 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
1748 | parent, root_objectid, owner, offset, | |
1749 | BTRFS_ADD_DELAYED_REF, NULL); | |
1750 | } | |
1751 | return ret; | |
1752 | } | |
1753 | ||
1754 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1755 | struct btrfs_root *root, | |
1756 | u64 bytenr, u64 num_bytes, | |
1757 | u64 parent, u64 root_objectid, | |
1758 | u64 owner, u64 offset, int refs_to_add, | |
1759 | struct btrfs_delayed_extent_op *extent_op) | |
1760 | { | |
1761 | struct btrfs_path *path; | |
1762 | struct extent_buffer *leaf; | |
1763 | struct btrfs_extent_item *item; | |
1764 | u64 refs; | |
1765 | int ret; | |
1766 | int err = 0; | |
1767 | ||
1768 | path = btrfs_alloc_path(); | |
1769 | if (!path) | |
1770 | return -ENOMEM; | |
1771 | ||
1772 | path->reada = 1; | |
1773 | path->leave_spinning = 1; | |
1774 | /* this will setup the path even if it fails to insert the back ref */ | |
1775 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1776 | path, bytenr, num_bytes, parent, | |
1777 | root_objectid, owner, offset, | |
1778 | refs_to_add, extent_op); | |
1779 | if (ret == 0) | |
1780 | goto out; | |
1781 | ||
1782 | if (ret != -EAGAIN) { | |
1783 | err = ret; | |
1784 | goto out; | |
1785 | } | |
1786 | ||
1787 | leaf = path->nodes[0]; | |
1788 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1789 | refs = btrfs_extent_refs(leaf, item); | |
1790 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1791 | if (extent_op) | |
1792 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1793 | |
5d4f98a2 | 1794 | btrfs_mark_buffer_dirty(leaf); |
56bec294 CM |
1795 | btrfs_release_path(root->fs_info->extent_root, path); |
1796 | ||
1797 | path->reada = 1; | |
b9473439 CM |
1798 | path->leave_spinning = 1; |
1799 | ||
56bec294 CM |
1800 | /* now insert the actual backref */ |
1801 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1802 | path, bytenr, parent, root_objectid, |
1803 | owner, offset, refs_to_add); | |
56bec294 | 1804 | BUG_ON(ret); |
5d4f98a2 | 1805 | out: |
56bec294 | 1806 | btrfs_free_path(path); |
5d4f98a2 | 1807 | return err; |
56bec294 CM |
1808 | } |
1809 | ||
5d4f98a2 YZ |
1810 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1811 | struct btrfs_root *root, | |
1812 | struct btrfs_delayed_ref_node *node, | |
1813 | struct btrfs_delayed_extent_op *extent_op, | |
1814 | int insert_reserved) | |
56bec294 | 1815 | { |
5d4f98a2 YZ |
1816 | int ret = 0; |
1817 | struct btrfs_delayed_data_ref *ref; | |
1818 | struct btrfs_key ins; | |
1819 | u64 parent = 0; | |
1820 | u64 ref_root = 0; | |
1821 | u64 flags = 0; | |
1822 | ||
1823 | ins.objectid = node->bytenr; | |
1824 | ins.offset = node->num_bytes; | |
1825 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1826 | ||
1827 | ref = btrfs_delayed_node_to_data_ref(node); | |
1828 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1829 | parent = ref->parent; | |
1830 | else | |
1831 | ref_root = ref->root; | |
1832 | ||
1833 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1834 | if (extent_op) { | |
1835 | BUG_ON(extent_op->update_key); | |
1836 | flags |= extent_op->flags_to_set; | |
1837 | } | |
1838 | ret = alloc_reserved_file_extent(trans, root, | |
1839 | parent, ref_root, flags, | |
1840 | ref->objectid, ref->offset, | |
1841 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1842 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1843 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1844 | node->num_bytes, parent, | |
1845 | ref_root, ref->objectid, | |
1846 | ref->offset, node->ref_mod, | |
1847 | extent_op); | |
1848 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1849 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1850 | node->num_bytes, parent, | |
1851 | ref_root, ref->objectid, | |
1852 | ref->offset, node->ref_mod, | |
1853 | extent_op); | |
1854 | } else { | |
1855 | BUG(); | |
1856 | } | |
1857 | return ret; | |
1858 | } | |
1859 | ||
1860 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
1861 | struct extent_buffer *leaf, | |
1862 | struct btrfs_extent_item *ei) | |
1863 | { | |
1864 | u64 flags = btrfs_extent_flags(leaf, ei); | |
1865 | if (extent_op->update_flags) { | |
1866 | flags |= extent_op->flags_to_set; | |
1867 | btrfs_set_extent_flags(leaf, ei, flags); | |
1868 | } | |
1869 | ||
1870 | if (extent_op->update_key) { | |
1871 | struct btrfs_tree_block_info *bi; | |
1872 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
1873 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
1874 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
1879 | struct btrfs_root *root, | |
1880 | struct btrfs_delayed_ref_node *node, | |
1881 | struct btrfs_delayed_extent_op *extent_op) | |
1882 | { | |
1883 | struct btrfs_key key; | |
1884 | struct btrfs_path *path; | |
1885 | struct btrfs_extent_item *ei; | |
1886 | struct extent_buffer *leaf; | |
1887 | u32 item_size; | |
56bec294 | 1888 | int ret; |
5d4f98a2 YZ |
1889 | int err = 0; |
1890 | ||
1891 | path = btrfs_alloc_path(); | |
1892 | if (!path) | |
1893 | return -ENOMEM; | |
1894 | ||
1895 | key.objectid = node->bytenr; | |
1896 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1897 | key.offset = node->num_bytes; | |
1898 | ||
1899 | path->reada = 1; | |
1900 | path->leave_spinning = 1; | |
1901 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
1902 | path, 0, 1); | |
1903 | if (ret < 0) { | |
1904 | err = ret; | |
1905 | goto out; | |
1906 | } | |
1907 | if (ret > 0) { | |
1908 | err = -EIO; | |
1909 | goto out; | |
1910 | } | |
1911 | ||
1912 | leaf = path->nodes[0]; | |
1913 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1914 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1915 | if (item_size < sizeof(*ei)) { | |
1916 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
1917 | path, (u64)-1, 0); | |
1918 | if (ret < 0) { | |
1919 | err = ret; | |
1920 | goto out; | |
1921 | } | |
1922 | leaf = path->nodes[0]; | |
1923 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1924 | } | |
1925 | #endif | |
1926 | BUG_ON(item_size < sizeof(*ei)); | |
1927 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1928 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 1929 | |
5d4f98a2 YZ |
1930 | btrfs_mark_buffer_dirty(leaf); |
1931 | out: | |
1932 | btrfs_free_path(path); | |
1933 | return err; | |
56bec294 CM |
1934 | } |
1935 | ||
5d4f98a2 YZ |
1936 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
1937 | struct btrfs_root *root, | |
1938 | struct btrfs_delayed_ref_node *node, | |
1939 | struct btrfs_delayed_extent_op *extent_op, | |
1940 | int insert_reserved) | |
56bec294 CM |
1941 | { |
1942 | int ret = 0; | |
5d4f98a2 YZ |
1943 | struct btrfs_delayed_tree_ref *ref; |
1944 | struct btrfs_key ins; | |
1945 | u64 parent = 0; | |
1946 | u64 ref_root = 0; | |
56bec294 | 1947 | |
5d4f98a2 YZ |
1948 | ins.objectid = node->bytenr; |
1949 | ins.offset = node->num_bytes; | |
1950 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 1951 | |
5d4f98a2 YZ |
1952 | ref = btrfs_delayed_node_to_tree_ref(node); |
1953 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
1954 | parent = ref->parent; | |
1955 | else | |
1956 | ref_root = ref->root; | |
1957 | ||
1958 | BUG_ON(node->ref_mod != 1); | |
1959 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1960 | BUG_ON(!extent_op || !extent_op->update_flags || | |
1961 | !extent_op->update_key); | |
1962 | ret = alloc_reserved_tree_block(trans, root, | |
1963 | parent, ref_root, | |
1964 | extent_op->flags_to_set, | |
1965 | &extent_op->key, | |
1966 | ref->level, &ins); | |
5d4f98a2 YZ |
1967 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1968 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1969 | node->num_bytes, parent, ref_root, | |
1970 | ref->level, 0, 1, extent_op); | |
1971 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1972 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1973 | node->num_bytes, parent, ref_root, | |
1974 | ref->level, 0, 1, extent_op); | |
1975 | } else { | |
1976 | BUG(); | |
1977 | } | |
56bec294 CM |
1978 | return ret; |
1979 | } | |
1980 | ||
1981 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
1982 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
1983 | struct btrfs_root *root, | |
1984 | struct btrfs_delayed_ref_node *node, | |
1985 | struct btrfs_delayed_extent_op *extent_op, | |
1986 | int insert_reserved) | |
56bec294 CM |
1987 | { |
1988 | int ret; | |
5d4f98a2 | 1989 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
1990 | struct btrfs_delayed_ref_head *head; |
1991 | /* | |
1992 | * we've hit the end of the chain and we were supposed | |
1993 | * to insert this extent into the tree. But, it got | |
1994 | * deleted before we ever needed to insert it, so all | |
1995 | * we have to do is clean up the accounting | |
1996 | */ | |
5d4f98a2 YZ |
1997 | BUG_ON(extent_op); |
1998 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 1999 | if (insert_reserved) { |
f0486c68 YZ |
2000 | btrfs_pin_extent(root, node->bytenr, |
2001 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2002 | if (head->is_data) { |
2003 | ret = btrfs_del_csums(trans, root, | |
2004 | node->bytenr, | |
2005 | node->num_bytes); | |
2006 | BUG_ON(ret); | |
2007 | } | |
56bec294 | 2008 | } |
56bec294 CM |
2009 | mutex_unlock(&head->mutex); |
2010 | return 0; | |
2011 | } | |
2012 | ||
5d4f98a2 YZ |
2013 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2014 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2015 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2016 | insert_reserved); | |
2017 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2018 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2019 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2020 | insert_reserved); | |
2021 | else | |
2022 | BUG(); | |
2023 | return ret; | |
56bec294 CM |
2024 | } |
2025 | ||
2026 | static noinline struct btrfs_delayed_ref_node * | |
2027 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2028 | { | |
2029 | struct rb_node *node; | |
2030 | struct btrfs_delayed_ref_node *ref; | |
2031 | int action = BTRFS_ADD_DELAYED_REF; | |
2032 | again: | |
2033 | /* | |
2034 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2035 | * this prevents ref count from going down to zero when | |
2036 | * there still are pending delayed ref. | |
2037 | */ | |
2038 | node = rb_prev(&head->node.rb_node); | |
2039 | while (1) { | |
2040 | if (!node) | |
2041 | break; | |
2042 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2043 | rb_node); | |
2044 | if (ref->bytenr != head->node.bytenr) | |
2045 | break; | |
5d4f98a2 | 2046 | if (ref->action == action) |
56bec294 CM |
2047 | return ref; |
2048 | node = rb_prev(node); | |
2049 | } | |
2050 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2051 | action = BTRFS_DROP_DELAYED_REF; | |
2052 | goto again; | |
2053 | } | |
2054 | return NULL; | |
2055 | } | |
2056 | ||
c3e69d58 CM |
2057 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2058 | struct btrfs_root *root, | |
2059 | struct list_head *cluster) | |
56bec294 | 2060 | { |
56bec294 CM |
2061 | struct btrfs_delayed_ref_root *delayed_refs; |
2062 | struct btrfs_delayed_ref_node *ref; | |
2063 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2064 | struct btrfs_delayed_extent_op *extent_op; |
56bec294 | 2065 | int ret; |
c3e69d58 | 2066 | int count = 0; |
56bec294 | 2067 | int must_insert_reserved = 0; |
56bec294 CM |
2068 | |
2069 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2070 | while (1) { |
2071 | if (!locked_ref) { | |
c3e69d58 CM |
2072 | /* pick a new head ref from the cluster list */ |
2073 | if (list_empty(cluster)) | |
56bec294 | 2074 | break; |
56bec294 | 2075 | |
c3e69d58 CM |
2076 | locked_ref = list_entry(cluster->next, |
2077 | struct btrfs_delayed_ref_head, cluster); | |
2078 | ||
2079 | /* grab the lock that says we are going to process | |
2080 | * all the refs for this head */ | |
2081 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2082 | ||
2083 | /* | |
2084 | * we may have dropped the spin lock to get the head | |
2085 | * mutex lock, and that might have given someone else | |
2086 | * time to free the head. If that's true, it has been | |
2087 | * removed from our list and we can move on. | |
2088 | */ | |
2089 | if (ret == -EAGAIN) { | |
2090 | locked_ref = NULL; | |
2091 | count++; | |
2092 | continue; | |
56bec294 CM |
2093 | } |
2094 | } | |
a28ec197 | 2095 | |
56bec294 CM |
2096 | /* |
2097 | * record the must insert reserved flag before we | |
2098 | * drop the spin lock. | |
2099 | */ | |
2100 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2101 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2102 | |
5d4f98a2 YZ |
2103 | extent_op = locked_ref->extent_op; |
2104 | locked_ref->extent_op = NULL; | |
2105 | ||
56bec294 CM |
2106 | /* |
2107 | * locked_ref is the head node, so we have to go one | |
2108 | * node back for any delayed ref updates | |
2109 | */ | |
56bec294 CM |
2110 | ref = select_delayed_ref(locked_ref); |
2111 | if (!ref) { | |
2112 | /* All delayed refs have been processed, Go ahead | |
2113 | * and send the head node to run_one_delayed_ref, | |
2114 | * so that any accounting fixes can happen | |
2115 | */ | |
2116 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2117 | |
2118 | if (extent_op && must_insert_reserved) { | |
2119 | kfree(extent_op); | |
2120 | extent_op = NULL; | |
2121 | } | |
2122 | ||
2123 | if (extent_op) { | |
2124 | spin_unlock(&delayed_refs->lock); | |
2125 | ||
2126 | ret = run_delayed_extent_op(trans, root, | |
2127 | ref, extent_op); | |
2128 | BUG_ON(ret); | |
2129 | kfree(extent_op); | |
2130 | ||
2131 | cond_resched(); | |
2132 | spin_lock(&delayed_refs->lock); | |
2133 | continue; | |
2134 | } | |
2135 | ||
c3e69d58 | 2136 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
2137 | locked_ref = NULL; |
2138 | } | |
02217ed2 | 2139 | |
56bec294 CM |
2140 | ref->in_tree = 0; |
2141 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2142 | delayed_refs->num_entries--; | |
5d4f98a2 | 2143 | |
56bec294 | 2144 | spin_unlock(&delayed_refs->lock); |
925baedd | 2145 | |
5d4f98a2 | 2146 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 CM |
2147 | must_insert_reserved); |
2148 | BUG_ON(ret); | |
eb099670 | 2149 | |
5d4f98a2 YZ |
2150 | btrfs_put_delayed_ref(ref); |
2151 | kfree(extent_op); | |
c3e69d58 | 2152 | count++; |
5d4f98a2 | 2153 | |
c3e69d58 CM |
2154 | cond_resched(); |
2155 | spin_lock(&delayed_refs->lock); | |
2156 | } | |
2157 | return count; | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * this starts processing the delayed reference count updates and | |
2162 | * extent insertions we have queued up so far. count can be | |
2163 | * 0, which means to process everything in the tree at the start | |
2164 | * of the run (but not newly added entries), or it can be some target | |
2165 | * number you'd like to process. | |
2166 | */ | |
2167 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2168 | struct btrfs_root *root, unsigned long count) | |
2169 | { | |
2170 | struct rb_node *node; | |
2171 | struct btrfs_delayed_ref_root *delayed_refs; | |
2172 | struct btrfs_delayed_ref_node *ref; | |
2173 | struct list_head cluster; | |
2174 | int ret; | |
2175 | int run_all = count == (unsigned long)-1; | |
2176 | int run_most = 0; | |
2177 | ||
2178 | if (root == root->fs_info->extent_root) | |
2179 | root = root->fs_info->tree_root; | |
2180 | ||
2181 | delayed_refs = &trans->transaction->delayed_refs; | |
2182 | INIT_LIST_HEAD(&cluster); | |
2183 | again: | |
2184 | spin_lock(&delayed_refs->lock); | |
2185 | if (count == 0) { | |
2186 | count = delayed_refs->num_entries * 2; | |
2187 | run_most = 1; | |
2188 | } | |
2189 | while (1) { | |
2190 | if (!(run_all || run_most) && | |
2191 | delayed_refs->num_heads_ready < 64) | |
2192 | break; | |
eb099670 | 2193 | |
56bec294 | 2194 | /* |
c3e69d58 CM |
2195 | * go find something we can process in the rbtree. We start at |
2196 | * the beginning of the tree, and then build a cluster | |
2197 | * of refs to process starting at the first one we are able to | |
2198 | * lock | |
56bec294 | 2199 | */ |
c3e69d58 CM |
2200 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2201 | delayed_refs->run_delayed_start); | |
2202 | if (ret) | |
56bec294 CM |
2203 | break; |
2204 | ||
c3e69d58 CM |
2205 | ret = run_clustered_refs(trans, root, &cluster); |
2206 | BUG_ON(ret < 0); | |
2207 | ||
2208 | count -= min_t(unsigned long, ret, count); | |
2209 | ||
2210 | if (count == 0) | |
2211 | break; | |
eb099670 | 2212 | } |
c3e69d58 | 2213 | |
56bec294 | 2214 | if (run_all) { |
56bec294 | 2215 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2216 | if (!node) |
56bec294 | 2217 | goto out; |
c3e69d58 | 2218 | count = (unsigned long)-1; |
e9d0b13b | 2219 | |
56bec294 CM |
2220 | while (node) { |
2221 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2222 | rb_node); | |
2223 | if (btrfs_delayed_ref_is_head(ref)) { | |
2224 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2225 | |
56bec294 CM |
2226 | head = btrfs_delayed_node_to_head(ref); |
2227 | atomic_inc(&ref->refs); | |
2228 | ||
2229 | spin_unlock(&delayed_refs->lock); | |
2230 | mutex_lock(&head->mutex); | |
2231 | mutex_unlock(&head->mutex); | |
2232 | ||
2233 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2234 | cond_resched(); |
56bec294 CM |
2235 | goto again; |
2236 | } | |
2237 | node = rb_next(node); | |
2238 | } | |
2239 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2240 | schedule_timeout(1); |
2241 | goto again; | |
5f39d397 | 2242 | } |
54aa1f4d | 2243 | out: |
c3e69d58 | 2244 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
2245 | return 0; |
2246 | } | |
2247 | ||
5d4f98a2 YZ |
2248 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2249 | struct btrfs_root *root, | |
2250 | u64 bytenr, u64 num_bytes, u64 flags, | |
2251 | int is_data) | |
2252 | { | |
2253 | struct btrfs_delayed_extent_op *extent_op; | |
2254 | int ret; | |
2255 | ||
2256 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2257 | if (!extent_op) | |
2258 | return -ENOMEM; | |
2259 | ||
2260 | extent_op->flags_to_set = flags; | |
2261 | extent_op->update_flags = 1; | |
2262 | extent_op->update_key = 0; | |
2263 | extent_op->is_data = is_data ? 1 : 0; | |
2264 | ||
2265 | ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); | |
2266 | if (ret) | |
2267 | kfree(extent_op); | |
2268 | return ret; | |
2269 | } | |
2270 | ||
2271 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2272 | struct btrfs_root *root, | |
2273 | struct btrfs_path *path, | |
2274 | u64 objectid, u64 offset, u64 bytenr) | |
2275 | { | |
2276 | struct btrfs_delayed_ref_head *head; | |
2277 | struct btrfs_delayed_ref_node *ref; | |
2278 | struct btrfs_delayed_data_ref *data_ref; | |
2279 | struct btrfs_delayed_ref_root *delayed_refs; | |
2280 | struct rb_node *node; | |
2281 | int ret = 0; | |
2282 | ||
2283 | ret = -ENOENT; | |
2284 | delayed_refs = &trans->transaction->delayed_refs; | |
2285 | spin_lock(&delayed_refs->lock); | |
2286 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2287 | if (!head) | |
2288 | goto out; | |
2289 | ||
2290 | if (!mutex_trylock(&head->mutex)) { | |
2291 | atomic_inc(&head->node.refs); | |
2292 | spin_unlock(&delayed_refs->lock); | |
2293 | ||
2294 | btrfs_release_path(root->fs_info->extent_root, path); | |
2295 | ||
2296 | mutex_lock(&head->mutex); | |
2297 | mutex_unlock(&head->mutex); | |
2298 | btrfs_put_delayed_ref(&head->node); | |
2299 | return -EAGAIN; | |
2300 | } | |
2301 | ||
2302 | node = rb_prev(&head->node.rb_node); | |
2303 | if (!node) | |
2304 | goto out_unlock; | |
2305 | ||
2306 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2307 | ||
2308 | if (ref->bytenr != bytenr) | |
2309 | goto out_unlock; | |
2310 | ||
2311 | ret = 1; | |
2312 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2313 | goto out_unlock; | |
2314 | ||
2315 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2316 | ||
2317 | node = rb_prev(node); | |
2318 | if (node) { | |
2319 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2320 | if (ref->bytenr == bytenr) | |
2321 | goto out_unlock; | |
2322 | } | |
2323 | ||
2324 | if (data_ref->root != root->root_key.objectid || | |
2325 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2326 | goto out_unlock; | |
2327 | ||
2328 | ret = 0; | |
2329 | out_unlock: | |
2330 | mutex_unlock(&head->mutex); | |
2331 | out: | |
2332 | spin_unlock(&delayed_refs->lock); | |
2333 | return ret; | |
2334 | } | |
2335 | ||
2336 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2337 | struct btrfs_root *root, | |
2338 | struct btrfs_path *path, | |
2339 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2340 | { |
2341 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2342 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2343 | struct btrfs_extent_data_ref *ref; |
2344 | struct btrfs_extent_inline_ref *iref; | |
2345 | struct btrfs_extent_item *ei; | |
f321e491 | 2346 | struct btrfs_key key; |
5d4f98a2 | 2347 | u32 item_size; |
be20aa9d | 2348 | int ret; |
925baedd | 2349 | |
be20aa9d | 2350 | key.objectid = bytenr; |
31840ae1 | 2351 | key.offset = (u64)-1; |
f321e491 | 2352 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2353 | |
be20aa9d CM |
2354 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2355 | if (ret < 0) | |
2356 | goto out; | |
2357 | BUG_ON(ret == 0); | |
80ff3856 YZ |
2358 | |
2359 | ret = -ENOENT; | |
2360 | if (path->slots[0] == 0) | |
31840ae1 | 2361 | goto out; |
be20aa9d | 2362 | |
31840ae1 | 2363 | path->slots[0]--; |
f321e491 | 2364 | leaf = path->nodes[0]; |
5d4f98a2 | 2365 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2366 | |
5d4f98a2 | 2367 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2368 | goto out; |
f321e491 | 2369 | |
5d4f98a2 YZ |
2370 | ret = 1; |
2371 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2372 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2373 | if (item_size < sizeof(*ei)) { | |
2374 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2375 | goto out; | |
2376 | } | |
2377 | #endif | |
2378 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2379 | |
5d4f98a2 YZ |
2380 | if (item_size != sizeof(*ei) + |
2381 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2382 | goto out; | |
be20aa9d | 2383 | |
5d4f98a2 YZ |
2384 | if (btrfs_extent_generation(leaf, ei) <= |
2385 | btrfs_root_last_snapshot(&root->root_item)) | |
2386 | goto out; | |
2387 | ||
2388 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2389 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2390 | BTRFS_EXTENT_DATA_REF_KEY) | |
2391 | goto out; | |
2392 | ||
2393 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2394 | if (btrfs_extent_refs(leaf, ei) != | |
2395 | btrfs_extent_data_ref_count(leaf, ref) || | |
2396 | btrfs_extent_data_ref_root(leaf, ref) != | |
2397 | root->root_key.objectid || | |
2398 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2399 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2400 | goto out; | |
2401 | ||
2402 | ret = 0; | |
2403 | out: | |
2404 | return ret; | |
2405 | } | |
2406 | ||
2407 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2408 | struct btrfs_root *root, | |
2409 | u64 objectid, u64 offset, u64 bytenr) | |
2410 | { | |
2411 | struct btrfs_path *path; | |
2412 | int ret; | |
2413 | int ret2; | |
2414 | ||
2415 | path = btrfs_alloc_path(); | |
2416 | if (!path) | |
2417 | return -ENOENT; | |
2418 | ||
2419 | do { | |
2420 | ret = check_committed_ref(trans, root, path, objectid, | |
2421 | offset, bytenr); | |
2422 | if (ret && ret != -ENOENT) | |
f321e491 | 2423 | goto out; |
80ff3856 | 2424 | |
5d4f98a2 YZ |
2425 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2426 | offset, bytenr); | |
2427 | } while (ret2 == -EAGAIN); | |
2428 | ||
2429 | if (ret2 && ret2 != -ENOENT) { | |
2430 | ret = ret2; | |
2431 | goto out; | |
f321e491 | 2432 | } |
5d4f98a2 YZ |
2433 | |
2434 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2435 | ret = 0; | |
be20aa9d | 2436 | out: |
80ff3856 | 2437 | btrfs_free_path(path); |
f0486c68 YZ |
2438 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2439 | WARN_ON(ret > 0); | |
f321e491 | 2440 | return ret; |
be20aa9d | 2441 | } |
c5739bba | 2442 | |
5d4f98a2 | 2443 | #if 0 |
31840ae1 ZY |
2444 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
2445 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 2446 | { |
5f39d397 | 2447 | struct btrfs_key key; |
6407bf6d | 2448 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
2449 | u64 root_gen; |
2450 | u32 nritems; | |
02217ed2 | 2451 | int i; |
db94535d | 2452 | int level; |
31840ae1 | 2453 | int ret = 0; |
e4657689 | 2454 | int shared = 0; |
a28ec197 | 2455 | |
3768f368 | 2456 | if (!root->ref_cows) |
a28ec197 | 2457 | return 0; |
5f39d397 | 2458 | |
e4657689 ZY |
2459 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
2460 | shared = 0; | |
2461 | root_gen = root->root_key.offset; | |
2462 | } else { | |
2463 | shared = 1; | |
2464 | root_gen = trans->transid - 1; | |
2465 | } | |
2466 | ||
db94535d | 2467 | level = btrfs_header_level(buf); |
5f39d397 | 2468 | nritems = btrfs_header_nritems(buf); |
4a096752 | 2469 | |
31840ae1 | 2470 | if (level == 0) { |
31153d81 YZ |
2471 | struct btrfs_leaf_ref *ref; |
2472 | struct btrfs_extent_info *info; | |
2473 | ||
31840ae1 | 2474 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 2475 | if (!ref) { |
31840ae1 | 2476 | ret = -ENOMEM; |
31153d81 YZ |
2477 | goto out; |
2478 | } | |
2479 | ||
e4657689 | 2480 | ref->root_gen = root_gen; |
31153d81 YZ |
2481 | ref->bytenr = buf->start; |
2482 | ref->owner = btrfs_header_owner(buf); | |
2483 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 2484 | ref->nritems = nr_extents; |
31153d81 | 2485 | info = ref->extents; |
bcc63abb | 2486 | |
31840ae1 | 2487 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
2488 | u64 disk_bytenr; |
2489 | btrfs_item_key_to_cpu(buf, &key, i); | |
2490 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
2491 | continue; | |
2492 | fi = btrfs_item_ptr(buf, i, | |
2493 | struct btrfs_file_extent_item); | |
2494 | if (btrfs_file_extent_type(buf, fi) == | |
2495 | BTRFS_FILE_EXTENT_INLINE) | |
2496 | continue; | |
2497 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2498 | if (disk_bytenr == 0) | |
2499 | continue; | |
2500 | ||
2501 | info->bytenr = disk_bytenr; | |
2502 | info->num_bytes = | |
2503 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
2504 | info->objectid = key.objectid; | |
2505 | info->offset = key.offset; | |
2506 | info++; | |
2507 | } | |
2508 | ||
e4657689 | 2509 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
2510 | if (ret == -EEXIST && shared) { |
2511 | struct btrfs_leaf_ref *old; | |
2512 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
2513 | BUG_ON(!old); | |
2514 | btrfs_remove_leaf_ref(root, old); | |
2515 | btrfs_free_leaf_ref(root, old); | |
2516 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
2517 | } | |
31153d81 | 2518 | WARN_ON(ret); |
bcc63abb | 2519 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
2520 | } |
2521 | out: | |
31840ae1 ZY |
2522 | return ret; |
2523 | } | |
2524 | ||
b7a9f29f CM |
2525 | /* when a block goes through cow, we update the reference counts of |
2526 | * everything that block points to. The internal pointers of the block | |
2527 | * can be in just about any order, and it is likely to have clusters of | |
2528 | * things that are close together and clusters of things that are not. | |
2529 | * | |
2530 | * To help reduce the seeks that come with updating all of these reference | |
2531 | * counts, sort them by byte number before actual updates are done. | |
2532 | * | |
2533 | * struct refsort is used to match byte number to slot in the btree block. | |
2534 | * we sort based on the byte number and then use the slot to actually | |
2535 | * find the item. | |
bd56b302 CM |
2536 | * |
2537 | * struct refsort is smaller than strcut btrfs_item and smaller than | |
2538 | * struct btrfs_key_ptr. Since we're currently limited to the page size | |
2539 | * for a btree block, there's no way for a kmalloc of refsorts for a | |
2540 | * single node to be bigger than a page. | |
b7a9f29f CM |
2541 | */ |
2542 | struct refsort { | |
2543 | u64 bytenr; | |
2544 | u32 slot; | |
2545 | }; | |
2546 | ||
2547 | /* | |
2548 | * for passing into sort() | |
2549 | */ | |
2550 | static int refsort_cmp(const void *a_void, const void *b_void) | |
2551 | { | |
2552 | const struct refsort *a = a_void; | |
2553 | const struct refsort *b = b_void; | |
2554 | ||
2555 | if (a->bytenr < b->bytenr) | |
2556 | return -1; | |
2557 | if (a->bytenr > b->bytenr) | |
2558 | return 1; | |
2559 | return 0; | |
2560 | } | |
5d4f98a2 | 2561 | #endif |
b7a9f29f | 2562 | |
5d4f98a2 | 2563 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2564 | struct btrfs_root *root, |
5d4f98a2 YZ |
2565 | struct extent_buffer *buf, |
2566 | int full_backref, int inc) | |
31840ae1 ZY |
2567 | { |
2568 | u64 bytenr; | |
5d4f98a2 YZ |
2569 | u64 num_bytes; |
2570 | u64 parent; | |
31840ae1 | 2571 | u64 ref_root; |
31840ae1 | 2572 | u32 nritems; |
31840ae1 ZY |
2573 | struct btrfs_key key; |
2574 | struct btrfs_file_extent_item *fi; | |
2575 | int i; | |
2576 | int level; | |
2577 | int ret = 0; | |
31840ae1 | 2578 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
5d4f98a2 | 2579 | u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
2580 | |
2581 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2582 | nritems = btrfs_header_nritems(buf); |
2583 | level = btrfs_header_level(buf); | |
2584 | ||
5d4f98a2 YZ |
2585 | if (!root->ref_cows && level == 0) |
2586 | return 0; | |
31840ae1 | 2587 | |
5d4f98a2 YZ |
2588 | if (inc) |
2589 | process_func = btrfs_inc_extent_ref; | |
2590 | else | |
2591 | process_func = btrfs_free_extent; | |
31840ae1 | 2592 | |
5d4f98a2 YZ |
2593 | if (full_backref) |
2594 | parent = buf->start; | |
2595 | else | |
2596 | parent = 0; | |
2597 | ||
2598 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2599 | if (level == 0) { |
5d4f98a2 | 2600 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2601 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2602 | continue; | |
5d4f98a2 | 2603 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2604 | struct btrfs_file_extent_item); |
2605 | if (btrfs_file_extent_type(buf, fi) == | |
2606 | BTRFS_FILE_EXTENT_INLINE) | |
2607 | continue; | |
2608 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2609 | if (bytenr == 0) | |
2610 | continue; | |
5d4f98a2 YZ |
2611 | |
2612 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2613 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2614 | ret = process_func(trans, root, bytenr, num_bytes, | |
2615 | parent, ref_root, key.objectid, | |
2616 | key.offset); | |
31840ae1 ZY |
2617 | if (ret) |
2618 | goto fail; | |
2619 | } else { | |
5d4f98a2 YZ |
2620 | bytenr = btrfs_node_blockptr(buf, i); |
2621 | num_bytes = btrfs_level_size(root, level - 1); | |
2622 | ret = process_func(trans, root, bytenr, num_bytes, | |
2623 | parent, ref_root, level - 1, 0); | |
31840ae1 ZY |
2624 | if (ret) |
2625 | goto fail; | |
2626 | } | |
2627 | } | |
2628 | return 0; | |
2629 | fail: | |
5d4f98a2 YZ |
2630 | BUG(); |
2631 | return ret; | |
2632 | } | |
2633 | ||
2634 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2635 | struct extent_buffer *buf, int full_backref) | |
2636 | { | |
2637 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
2638 | } | |
2639 | ||
2640 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2641 | struct extent_buffer *buf, int full_backref) | |
2642 | { | |
2643 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
31840ae1 ZY |
2644 | } |
2645 | ||
9078a3e1 CM |
2646 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2647 | struct btrfs_root *root, | |
2648 | struct btrfs_path *path, | |
2649 | struct btrfs_block_group_cache *cache) | |
2650 | { | |
2651 | int ret; | |
9078a3e1 | 2652 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2653 | unsigned long bi; |
2654 | struct extent_buffer *leaf; | |
9078a3e1 | 2655 | |
9078a3e1 | 2656 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2657 | if (ret < 0) |
2658 | goto fail; | |
9078a3e1 | 2659 | BUG_ON(ret); |
5f39d397 CM |
2660 | |
2661 | leaf = path->nodes[0]; | |
2662 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2663 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2664 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 2665 | btrfs_release_path(extent_root, path); |
54aa1f4d | 2666 | fail: |
9078a3e1 CM |
2667 | if (ret) |
2668 | return ret; | |
9078a3e1 CM |
2669 | return 0; |
2670 | ||
2671 | } | |
2672 | ||
4a8c9a62 YZ |
2673 | static struct btrfs_block_group_cache * |
2674 | next_block_group(struct btrfs_root *root, | |
2675 | struct btrfs_block_group_cache *cache) | |
2676 | { | |
2677 | struct rb_node *node; | |
2678 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2679 | node = rb_next(&cache->cache_node); | |
2680 | btrfs_put_block_group(cache); | |
2681 | if (node) { | |
2682 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2683 | cache_node); | |
11dfe35a | 2684 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2685 | } else |
2686 | cache = NULL; | |
2687 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2688 | return cache; | |
2689 | } | |
2690 | ||
96b5179d CM |
2691 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
2692 | struct btrfs_root *root) | |
9078a3e1 | 2693 | { |
4a8c9a62 | 2694 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 2695 | int err = 0; |
9078a3e1 | 2696 | struct btrfs_path *path; |
96b5179d | 2697 | u64 last = 0; |
9078a3e1 CM |
2698 | |
2699 | path = btrfs_alloc_path(); | |
2700 | if (!path) | |
2701 | return -ENOMEM; | |
2702 | ||
d397712b | 2703 | while (1) { |
4a8c9a62 YZ |
2704 | if (last == 0) { |
2705 | err = btrfs_run_delayed_refs(trans, root, | |
2706 | (unsigned long)-1); | |
2707 | BUG_ON(err); | |
0f9dd46c | 2708 | } |
54aa1f4d | 2709 | |
4a8c9a62 YZ |
2710 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
2711 | while (cache) { | |
2712 | if (cache->dirty) | |
2713 | break; | |
2714 | cache = next_block_group(root, cache); | |
2715 | } | |
2716 | if (!cache) { | |
2717 | if (last == 0) | |
2718 | break; | |
2719 | last = 0; | |
2720 | continue; | |
2721 | } | |
0f9dd46c | 2722 | |
e8569813 | 2723 | cache->dirty = 0; |
4a8c9a62 | 2724 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 2725 | |
4a8c9a62 YZ |
2726 | err = write_one_cache_group(trans, root, path, cache); |
2727 | BUG_ON(err); | |
2728 | btrfs_put_block_group(cache); | |
9078a3e1 | 2729 | } |
4a8c9a62 | 2730 | |
9078a3e1 | 2731 | btrfs_free_path(path); |
4a8c9a62 | 2732 | return 0; |
9078a3e1 CM |
2733 | } |
2734 | ||
d2fb3437 YZ |
2735 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
2736 | { | |
2737 | struct btrfs_block_group_cache *block_group; | |
2738 | int readonly = 0; | |
2739 | ||
2740 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
2741 | if (!block_group || block_group->ro) | |
2742 | readonly = 1; | |
2743 | if (block_group) | |
fa9c0d79 | 2744 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
2745 | return readonly; |
2746 | } | |
2747 | ||
593060d7 CM |
2748 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
2749 | u64 total_bytes, u64 bytes_used, | |
2750 | struct btrfs_space_info **space_info) | |
2751 | { | |
2752 | struct btrfs_space_info *found; | |
b742bb82 YZ |
2753 | int i; |
2754 | int factor; | |
2755 | ||
2756 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
2757 | BTRFS_BLOCK_GROUP_RAID10)) | |
2758 | factor = 2; | |
2759 | else | |
2760 | factor = 1; | |
593060d7 CM |
2761 | |
2762 | found = __find_space_info(info, flags); | |
2763 | if (found) { | |
25179201 | 2764 | spin_lock(&found->lock); |
593060d7 CM |
2765 | found->total_bytes += total_bytes; |
2766 | found->bytes_used += bytes_used; | |
b742bb82 | 2767 | found->disk_used += bytes_used * factor; |
8f18cf13 | 2768 | found->full = 0; |
25179201 | 2769 | spin_unlock(&found->lock); |
593060d7 CM |
2770 | *space_info = found; |
2771 | return 0; | |
2772 | } | |
c146afad | 2773 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
2774 | if (!found) |
2775 | return -ENOMEM; | |
2776 | ||
b742bb82 YZ |
2777 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
2778 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 2779 | init_rwsem(&found->groups_sem); |
0f9dd46c | 2780 | spin_lock_init(&found->lock); |
b742bb82 YZ |
2781 | found->flags = flags & (BTRFS_BLOCK_GROUP_DATA | |
2782 | BTRFS_BLOCK_GROUP_SYSTEM | | |
2783 | BTRFS_BLOCK_GROUP_METADATA); | |
593060d7 CM |
2784 | found->total_bytes = total_bytes; |
2785 | found->bytes_used = bytes_used; | |
b742bb82 | 2786 | found->disk_used = bytes_used * factor; |
593060d7 | 2787 | found->bytes_pinned = 0; |
e8569813 | 2788 | found->bytes_reserved = 0; |
c146afad | 2789 | found->bytes_readonly = 0; |
f0486c68 | 2790 | found->bytes_may_use = 0; |
593060d7 | 2791 | found->full = 0; |
0ef3e66b | 2792 | found->force_alloc = 0; |
593060d7 | 2793 | *space_info = found; |
4184ea7f | 2794 | list_add_rcu(&found->list, &info->space_info); |
817d52f8 | 2795 | atomic_set(&found->caching_threads, 0); |
593060d7 CM |
2796 | return 0; |
2797 | } | |
2798 | ||
8790d502 CM |
2799 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
2800 | { | |
2801 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 2802 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 2803 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 2804 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
2805 | if (extra_flags) { |
2806 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
2807 | fs_info->avail_data_alloc_bits |= extra_flags; | |
2808 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
2809 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
2810 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
2811 | fs_info->avail_system_alloc_bits |= extra_flags; | |
2812 | } | |
2813 | } | |
593060d7 | 2814 | |
2b82032c | 2815 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 2816 | { |
2b82032c | 2817 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
a061fc8d CM |
2818 | |
2819 | if (num_devices == 1) | |
2820 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
2821 | if (num_devices < 4) | |
2822 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
2823 | ||
ec44a35c CM |
2824 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
2825 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 2826 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 2827 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 2828 | } |
ec44a35c CM |
2829 | |
2830 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 2831 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 2832 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 2833 | } |
ec44a35c CM |
2834 | |
2835 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
2836 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
2837 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
2838 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
2839 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
2840 | return flags; | |
2841 | } | |
2842 | ||
b742bb82 | 2843 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 2844 | { |
b742bb82 YZ |
2845 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
2846 | flags |= root->fs_info->avail_data_alloc_bits & | |
2847 | root->fs_info->data_alloc_profile; | |
2848 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
2849 | flags |= root->fs_info->avail_system_alloc_bits & | |
2850 | root->fs_info->system_alloc_profile; | |
2851 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
2852 | flags |= root->fs_info->avail_metadata_alloc_bits & | |
2853 | root->fs_info->metadata_alloc_profile; | |
2854 | return btrfs_reduce_alloc_profile(root, flags); | |
2855 | } | |
2856 | ||
2857 | static u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) | |
2858 | { | |
2859 | u64 flags; | |
6a63209f | 2860 | |
b742bb82 YZ |
2861 | if (data) |
2862 | flags = BTRFS_BLOCK_GROUP_DATA; | |
2863 | else if (root == root->fs_info->chunk_root) | |
2864 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
2865 | else | |
2866 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
2867 | ||
2868 | return get_alloc_profile(root, flags); | |
6a63209f JB |
2869 | } |
2870 | ||
2871 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) | |
2872 | { | |
6a63209f | 2873 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, |
f0486c68 | 2874 | BTRFS_BLOCK_GROUP_DATA); |
6a63209f JB |
2875 | } |
2876 | ||
6a63209f JB |
2877 | /* |
2878 | * This will check the space that the inode allocates from to make sure we have | |
2879 | * enough space for bytes. | |
2880 | */ | |
0ca1f7ce | 2881 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f JB |
2882 | { |
2883 | struct btrfs_space_info *data_sinfo; | |
0ca1f7ce | 2884 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ab6e2410 | 2885 | u64 used; |
5da9d01b | 2886 | int ret = 0, committed = 0; |
6a63209f JB |
2887 | |
2888 | /* make sure bytes are sectorsize aligned */ | |
2889 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
2890 | ||
2891 | data_sinfo = BTRFS_I(inode)->space_info; | |
33b4d47f CM |
2892 | if (!data_sinfo) |
2893 | goto alloc; | |
2894 | ||
6a63209f JB |
2895 | again: |
2896 | /* make sure we have enough space to handle the data first */ | |
2897 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
2898 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
2899 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
2900 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
2901 | |
2902 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 JB |
2903 | struct btrfs_trans_handle *trans; |
2904 | ||
6a63209f JB |
2905 | /* |
2906 | * if we don't have enough free bytes in this space then we need | |
2907 | * to alloc a new chunk. | |
2908 | */ | |
2909 | if (!data_sinfo->full) { | |
2910 | u64 alloc_target; | |
6a63209f JB |
2911 | |
2912 | data_sinfo->force_alloc = 1; | |
2913 | spin_unlock(&data_sinfo->lock); | |
33b4d47f | 2914 | alloc: |
6a63209f | 2915 | alloc_target = btrfs_get_alloc_profile(root, 1); |
a22285a6 YZ |
2916 | trans = btrfs_join_transaction(root, 1); |
2917 | if (IS_ERR(trans)) | |
2918 | return PTR_ERR(trans); | |
6a63209f JB |
2919 | |
2920 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
2921 | bytes + 2 * 1024 * 1024, | |
2922 | alloc_target, 0); | |
2923 | btrfs_end_transaction(trans, root); | |
8929ecfa | 2924 | if (ret < 0) |
6a63209f | 2925 | return ret; |
33b4d47f CM |
2926 | |
2927 | if (!data_sinfo) { | |
2928 | btrfs_set_inode_space_info(root, inode); | |
2929 | data_sinfo = BTRFS_I(inode)->space_info; | |
2930 | } | |
6a63209f JB |
2931 | goto again; |
2932 | } | |
2933 | spin_unlock(&data_sinfo->lock); | |
4e06bdd6 JB |
2934 | |
2935 | /* commit the current transaction and try again */ | |
dd7e0b7b | 2936 | if (!committed && !root->fs_info->open_ioctl_trans) { |
4e06bdd6 JB |
2937 | committed = 1; |
2938 | trans = btrfs_join_transaction(root, 1); | |
a22285a6 YZ |
2939 | if (IS_ERR(trans)) |
2940 | return PTR_ERR(trans); | |
4e06bdd6 JB |
2941 | ret = btrfs_commit_transaction(trans, root); |
2942 | if (ret) | |
2943 | return ret; | |
2944 | goto again; | |
2945 | } | |
2946 | ||
8929ecfa YZ |
2947 | printk(KERN_ERR "no space left, need %llu, %llu bytes_used, " |
2948 | "%llu bytes_reserved, " "%llu bytes_pinned, " | |
2949 | "%llu bytes_readonly, %llu may use %llu total\n", | |
2950 | (unsigned long long)bytes, | |
21380931 JB |
2951 | (unsigned long long)data_sinfo->bytes_used, |
2952 | (unsigned long long)data_sinfo->bytes_reserved, | |
2953 | (unsigned long long)data_sinfo->bytes_pinned, | |
2954 | (unsigned long long)data_sinfo->bytes_readonly, | |
2955 | (unsigned long long)data_sinfo->bytes_may_use, | |
2956 | (unsigned long long)data_sinfo->total_bytes); | |
6a63209f JB |
2957 | return -ENOSPC; |
2958 | } | |
2959 | data_sinfo->bytes_may_use += bytes; | |
2960 | BTRFS_I(inode)->reserved_bytes += bytes; | |
2961 | spin_unlock(&data_sinfo->lock); | |
2962 | ||
9ed74f2d | 2963 | return 0; |
6a63209f JB |
2964 | } |
2965 | ||
2966 | /* | |
0ca1f7ce YZ |
2967 | * called when we are clearing an delalloc extent from the |
2968 | * inode's io_tree or there was an error for whatever reason | |
2969 | * after calling btrfs_check_data_free_space | |
6a63209f | 2970 | */ |
0ca1f7ce | 2971 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
6a63209f | 2972 | { |
0ca1f7ce | 2973 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f JB |
2974 | struct btrfs_space_info *data_sinfo; |
2975 | ||
2976 | /* make sure bytes are sectorsize aligned */ | |
2977 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
2978 | ||
2979 | data_sinfo = BTRFS_I(inode)->space_info; | |
2980 | spin_lock(&data_sinfo->lock); | |
2981 | data_sinfo->bytes_may_use -= bytes; | |
2982 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
2983 | spin_unlock(&data_sinfo->lock); | |
2984 | } | |
2985 | ||
97e728d4 JB |
2986 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
2987 | { | |
2988 | struct list_head *head = &info->space_info; | |
2989 | struct btrfs_space_info *found; | |
2990 | ||
2991 | rcu_read_lock(); | |
2992 | list_for_each_entry_rcu(found, head, list) { | |
2993 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
2994 | found->force_alloc = 1; | |
2995 | } | |
2996 | rcu_read_unlock(); | |
2997 | } | |
2998 | ||
424499db YZ |
2999 | static int should_alloc_chunk(struct btrfs_space_info *sinfo, |
3000 | u64 alloc_bytes) | |
3001 | { | |
3002 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; | |
3003 | ||
3004 | if (sinfo->bytes_used + sinfo->bytes_reserved + | |
3005 | alloc_bytes + 256 * 1024 * 1024 < num_bytes) | |
3006 | return 0; | |
3007 | ||
3008 | if (sinfo->bytes_used + sinfo->bytes_reserved + | |
3009 | alloc_bytes < div_factor(num_bytes, 8)) | |
3010 | return 0; | |
3011 | ||
3012 | return 1; | |
3013 | } | |
3014 | ||
6324fbf3 CM |
3015 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
3016 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 3017 | u64 flags, int force) |
6324fbf3 CM |
3018 | { |
3019 | struct btrfs_space_info *space_info; | |
97e728d4 | 3020 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
c146afad YZ |
3021 | int ret = 0; |
3022 | ||
97e728d4 | 3023 | mutex_lock(&fs_info->chunk_mutex); |
6324fbf3 | 3024 | |
2b82032c | 3025 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 3026 | |
6324fbf3 | 3027 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3028 | if (!space_info) { |
3029 | ret = update_space_info(extent_root->fs_info, flags, | |
3030 | 0, 0, &space_info); | |
3031 | BUG_ON(ret); | |
3032 | } | |
6324fbf3 CM |
3033 | BUG_ON(!space_info); |
3034 | ||
25179201 | 3035 | spin_lock(&space_info->lock); |
9ed74f2d | 3036 | if (space_info->force_alloc) |
0ef3e66b | 3037 | force = 1; |
25179201 JB |
3038 | if (space_info->full) { |
3039 | spin_unlock(&space_info->lock); | |
925baedd | 3040 | goto out; |
25179201 | 3041 | } |
6324fbf3 | 3042 | |
424499db | 3043 | if (!force && !should_alloc_chunk(space_info, alloc_bytes)) { |
25179201 | 3044 | spin_unlock(&space_info->lock); |
925baedd | 3045 | goto out; |
25179201 | 3046 | } |
25179201 JB |
3047 | spin_unlock(&space_info->lock); |
3048 | ||
97e728d4 JB |
3049 | /* |
3050 | * if we're doing a data chunk, go ahead and make sure that | |
3051 | * we keep a reasonable number of metadata chunks allocated in the | |
3052 | * FS as well. | |
3053 | */ | |
9ed74f2d | 3054 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3055 | fs_info->data_chunk_allocations++; |
3056 | if (!(fs_info->data_chunk_allocations % | |
3057 | fs_info->metadata_ratio)) | |
3058 | force_metadata_allocation(fs_info); | |
3059 | } | |
3060 | ||
2b82032c | 3061 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
9ed74f2d | 3062 | spin_lock(&space_info->lock); |
d397712b | 3063 | if (ret) |
6324fbf3 | 3064 | space_info->full = 1; |
424499db YZ |
3065 | else |
3066 | ret = 1; | |
9ed74f2d JB |
3067 | space_info->force_alloc = 0; |
3068 | spin_unlock(&space_info->lock); | |
a74a4b97 | 3069 | out: |
c146afad | 3070 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 3071 | return ret; |
6324fbf3 CM |
3072 | } |
3073 | ||
424499db YZ |
3074 | static int maybe_allocate_chunk(struct btrfs_trans_handle *trans, |
3075 | struct btrfs_root *root, | |
3076 | struct btrfs_space_info *sinfo, u64 num_bytes) | |
3077 | { | |
3078 | int ret; | |
3079 | int end_trans = 0; | |
3080 | ||
3081 | if (sinfo->full) | |
3082 | return 0; | |
3083 | ||
3084 | spin_lock(&sinfo->lock); | |
3085 | ret = should_alloc_chunk(sinfo, num_bytes + 2 * 1024 * 1024); | |
3086 | spin_unlock(&sinfo->lock); | |
3087 | if (!ret) | |
3088 | return 0; | |
3089 | ||
3090 | if (!trans) { | |
3091 | trans = btrfs_join_transaction(root, 1); | |
3092 | BUG_ON(IS_ERR(trans)); | |
3093 | end_trans = 1; | |
3094 | } | |
3095 | ||
3096 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
3097 | num_bytes + 2 * 1024 * 1024, | |
3098 | get_alloc_profile(root, sinfo->flags), 0); | |
3099 | ||
3100 | if (end_trans) | |
3101 | btrfs_end_transaction(trans, root); | |
3102 | ||
3103 | return ret == 1 ? 1 : 0; | |
3104 | } | |
3105 | ||
5da9d01b YZ |
3106 | /* |
3107 | * shrink metadata reservation for delalloc | |
3108 | */ | |
3109 | static int shrink_delalloc(struct btrfs_trans_handle *trans, | |
0ca1f7ce | 3110 | struct btrfs_root *root, u64 to_reclaim) |
5da9d01b | 3111 | { |
0ca1f7ce | 3112 | struct btrfs_block_rsv *block_rsv; |
5da9d01b YZ |
3113 | u64 reserved; |
3114 | u64 max_reclaim; | |
3115 | u64 reclaimed = 0; | |
3116 | int pause = 1; | |
3117 | int ret; | |
3118 | ||
0ca1f7ce YZ |
3119 | block_rsv = &root->fs_info->delalloc_block_rsv; |
3120 | spin_lock(&block_rsv->lock); | |
3121 | reserved = block_rsv->reserved; | |
3122 | spin_unlock(&block_rsv->lock); | |
5da9d01b YZ |
3123 | |
3124 | if (reserved == 0) | |
3125 | return 0; | |
3126 | ||
3127 | max_reclaim = min(reserved, to_reclaim); | |
3128 | ||
3129 | while (1) { | |
3130 | ret = btrfs_start_one_delalloc_inode(root, trans ? 1 : 0); | |
3131 | if (!ret) { | |
3132 | __set_current_state(TASK_INTERRUPTIBLE); | |
3133 | schedule_timeout(pause); | |
3134 | pause <<= 1; | |
3135 | if (pause > HZ / 10) | |
3136 | pause = HZ / 10; | |
3137 | } else { | |
3138 | pause = 1; | |
3139 | } | |
3140 | ||
0ca1f7ce YZ |
3141 | spin_lock(&block_rsv->lock); |
3142 | if (reserved > block_rsv->reserved) | |
3143 | reclaimed = reserved - block_rsv->reserved; | |
3144 | reserved = block_rsv->reserved; | |
3145 | spin_unlock(&block_rsv->lock); | |
5da9d01b YZ |
3146 | |
3147 | if (reserved == 0 || reclaimed >= max_reclaim) | |
3148 | break; | |
3149 | ||
3150 | if (trans && trans->transaction->blocked) | |
3151 | return -EAGAIN; | |
3152 | } | |
3153 | return reclaimed >= to_reclaim; | |
3154 | } | |
3155 | ||
f0486c68 YZ |
3156 | static int should_retry_reserve(struct btrfs_trans_handle *trans, |
3157 | struct btrfs_root *root, | |
3158 | struct btrfs_block_rsv *block_rsv, | |
3159 | u64 num_bytes, int *retries) | |
3160 | { | |
3161 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3162 | int ret; | |
3163 | ||
3164 | if ((*retries) > 2) | |
3165 | return -ENOSPC; | |
3166 | ||
3167 | ret = maybe_allocate_chunk(trans, root, space_info, num_bytes); | |
3168 | if (ret) | |
3169 | return 1; | |
3170 | ||
3171 | if (trans && trans->transaction->in_commit) | |
3172 | return -ENOSPC; | |
3173 | ||
0ca1f7ce | 3174 | ret = shrink_delalloc(trans, root, num_bytes); |
f0486c68 YZ |
3175 | if (ret) |
3176 | return ret; | |
3177 | ||
3178 | spin_lock(&space_info->lock); | |
3179 | if (space_info->bytes_pinned < num_bytes) | |
3180 | ret = 1; | |
3181 | spin_unlock(&space_info->lock); | |
3182 | if (ret) | |
3183 | return -ENOSPC; | |
3184 | ||
3185 | (*retries)++; | |
3186 | ||
3187 | if (trans) | |
3188 | return -EAGAIN; | |
3189 | ||
3190 | trans = btrfs_join_transaction(root, 1); | |
3191 | BUG_ON(IS_ERR(trans)); | |
3192 | ret = btrfs_commit_transaction(trans, root); | |
3193 | BUG_ON(ret); | |
3194 | ||
3195 | return 1; | |
3196 | } | |
3197 | ||
3198 | static int reserve_metadata_bytes(struct btrfs_block_rsv *block_rsv, | |
3199 | u64 num_bytes) | |
3200 | { | |
3201 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3202 | u64 unused; | |
3203 | int ret = -ENOSPC; | |
3204 | ||
3205 | spin_lock(&space_info->lock); | |
3206 | unused = space_info->bytes_used + space_info->bytes_reserved + | |
3207 | space_info->bytes_pinned + space_info->bytes_readonly; | |
3208 | ||
3209 | if (unused < space_info->total_bytes) | |
3210 | unused = space_info->total_bytes - unused; | |
3211 | else | |
3212 | unused = 0; | |
3213 | ||
3214 | if (unused >= num_bytes) { | |
3215 | if (block_rsv->priority >= 10) { | |
3216 | space_info->bytes_reserved += num_bytes; | |
3217 | ret = 0; | |
3218 | } else { | |
3219 | if ((unused + block_rsv->reserved) * | |
3220 | block_rsv->priority >= | |
3221 | (num_bytes + block_rsv->reserved) * 10) { | |
3222 | space_info->bytes_reserved += num_bytes; | |
3223 | ret = 0; | |
3224 | } | |
3225 | } | |
3226 | } | |
3227 | spin_unlock(&space_info->lock); | |
3228 | ||
3229 | return ret; | |
3230 | } | |
3231 | ||
3232 | static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans, | |
3233 | struct btrfs_root *root) | |
3234 | { | |
3235 | struct btrfs_block_rsv *block_rsv; | |
3236 | if (root->ref_cows) | |
3237 | block_rsv = trans->block_rsv; | |
3238 | else | |
3239 | block_rsv = root->block_rsv; | |
3240 | ||
3241 | if (!block_rsv) | |
3242 | block_rsv = &root->fs_info->empty_block_rsv; | |
3243 | ||
3244 | return block_rsv; | |
3245 | } | |
3246 | ||
3247 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
3248 | u64 num_bytes) | |
3249 | { | |
3250 | int ret = -ENOSPC; | |
3251 | spin_lock(&block_rsv->lock); | |
3252 | if (block_rsv->reserved >= num_bytes) { | |
3253 | block_rsv->reserved -= num_bytes; | |
3254 | if (block_rsv->reserved < block_rsv->size) | |
3255 | block_rsv->full = 0; | |
3256 | ret = 0; | |
3257 | } | |
3258 | spin_unlock(&block_rsv->lock); | |
3259 | return ret; | |
3260 | } | |
3261 | ||
3262 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
3263 | u64 num_bytes, int update_size) | |
3264 | { | |
3265 | spin_lock(&block_rsv->lock); | |
3266 | block_rsv->reserved += num_bytes; | |
3267 | if (update_size) | |
3268 | block_rsv->size += num_bytes; | |
3269 | else if (block_rsv->reserved >= block_rsv->size) | |
3270 | block_rsv->full = 1; | |
3271 | spin_unlock(&block_rsv->lock); | |
3272 | } | |
3273 | ||
3274 | void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, | |
3275 | struct btrfs_block_rsv *dest, u64 num_bytes) | |
3276 | { | |
3277 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3278 | ||
3279 | spin_lock(&block_rsv->lock); | |
3280 | if (num_bytes == (u64)-1) | |
3281 | num_bytes = block_rsv->size; | |
3282 | block_rsv->size -= num_bytes; | |
3283 | if (block_rsv->reserved >= block_rsv->size) { | |
3284 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3285 | block_rsv->reserved = block_rsv->size; | |
3286 | block_rsv->full = 1; | |
3287 | } else { | |
3288 | num_bytes = 0; | |
3289 | } | |
3290 | spin_unlock(&block_rsv->lock); | |
3291 | ||
3292 | if (num_bytes > 0) { | |
3293 | if (dest) { | |
3294 | block_rsv_add_bytes(dest, num_bytes, 0); | |
3295 | } else { | |
3296 | spin_lock(&space_info->lock); | |
3297 | space_info->bytes_reserved -= num_bytes; | |
3298 | spin_unlock(&space_info->lock); | |
3299 | } | |
3300 | } | |
3301 | } | |
3302 | ||
3303 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, | |
3304 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
3305 | { | |
3306 | int ret; | |
3307 | ||
3308 | ret = block_rsv_use_bytes(src, num_bytes); | |
3309 | if (ret) | |
3310 | return ret; | |
3311 | ||
3312 | block_rsv_add_bytes(dst, num_bytes, 1); | |
3313 | return 0; | |
3314 | } | |
3315 | ||
3316 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv) | |
3317 | { | |
3318 | memset(rsv, 0, sizeof(*rsv)); | |
3319 | spin_lock_init(&rsv->lock); | |
3320 | atomic_set(&rsv->usage, 1); | |
3321 | rsv->priority = 6; | |
3322 | INIT_LIST_HEAD(&rsv->list); | |
3323 | } | |
3324 | ||
3325 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root) | |
3326 | { | |
3327 | struct btrfs_block_rsv *block_rsv; | |
3328 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3329 | u64 alloc_target; | |
3330 | ||
3331 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); | |
3332 | if (!block_rsv) | |
3333 | return NULL; | |
3334 | ||
3335 | btrfs_init_block_rsv(block_rsv); | |
3336 | ||
3337 | alloc_target = btrfs_get_alloc_profile(root, 0); | |
3338 | block_rsv->space_info = __find_space_info(fs_info, | |
3339 | BTRFS_BLOCK_GROUP_METADATA); | |
3340 | ||
3341 | return block_rsv; | |
3342 | } | |
3343 | ||
3344 | void btrfs_free_block_rsv(struct btrfs_root *root, | |
3345 | struct btrfs_block_rsv *rsv) | |
3346 | { | |
3347 | if (rsv && atomic_dec_and_test(&rsv->usage)) { | |
3348 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
3349 | if (!rsv->durable) | |
3350 | kfree(rsv); | |
3351 | } | |
3352 | } | |
3353 | ||
3354 | /* | |
3355 | * make the block_rsv struct be able to capture freed space. | |
3356 | * the captured space will re-add to the the block_rsv struct | |
3357 | * after transaction commit | |
3358 | */ | |
3359 | void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info, | |
3360 | struct btrfs_block_rsv *block_rsv) | |
3361 | { | |
3362 | block_rsv->durable = 1; | |
3363 | mutex_lock(&fs_info->durable_block_rsv_mutex); | |
3364 | list_add_tail(&block_rsv->list, &fs_info->durable_block_rsv_list); | |
3365 | mutex_unlock(&fs_info->durable_block_rsv_mutex); | |
3366 | } | |
3367 | ||
3368 | int btrfs_block_rsv_add(struct btrfs_trans_handle *trans, | |
3369 | struct btrfs_root *root, | |
3370 | struct btrfs_block_rsv *block_rsv, | |
3371 | u64 num_bytes, int *retries) | |
3372 | { | |
3373 | int ret; | |
3374 | ||
3375 | if (num_bytes == 0) | |
3376 | return 0; | |
3377 | again: | |
3378 | ret = reserve_metadata_bytes(block_rsv, num_bytes); | |
3379 | if (!ret) { | |
3380 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
3381 | return 0; | |
3382 | } | |
3383 | ||
3384 | ret = should_retry_reserve(trans, root, block_rsv, num_bytes, retries); | |
3385 | if (ret > 0) | |
3386 | goto again; | |
3387 | ||
3388 | return ret; | |
3389 | } | |
3390 | ||
3391 | int btrfs_block_rsv_check(struct btrfs_trans_handle *trans, | |
3392 | struct btrfs_root *root, | |
3393 | struct btrfs_block_rsv *block_rsv, | |
3394 | u64 min_reserved, int min_factor) | |
3395 | { | |
3396 | u64 num_bytes = 0; | |
3397 | int commit_trans = 0; | |
3398 | int ret = -ENOSPC; | |
3399 | ||
3400 | if (!block_rsv) | |
3401 | return 0; | |
3402 | ||
3403 | spin_lock(&block_rsv->lock); | |
3404 | if (min_factor > 0) | |
3405 | num_bytes = div_factor(block_rsv->size, min_factor); | |
3406 | if (min_reserved > num_bytes) | |
3407 | num_bytes = min_reserved; | |
3408 | ||
3409 | if (block_rsv->reserved >= num_bytes) { | |
3410 | ret = 0; | |
3411 | } else { | |
3412 | num_bytes -= block_rsv->reserved; | |
3413 | if (block_rsv->durable && | |
3414 | block_rsv->freed[0] + block_rsv->freed[1] >= num_bytes) | |
3415 | commit_trans = 1; | |
3416 | } | |
3417 | spin_unlock(&block_rsv->lock); | |
3418 | if (!ret) | |
3419 | return 0; | |
3420 | ||
3421 | if (block_rsv->refill_used) { | |
3422 | ret = reserve_metadata_bytes(block_rsv, num_bytes); | |
3423 | if (!ret) { | |
3424 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
3425 | return 0; | |
3426 | } | |
3427 | } | |
3428 | ||
3429 | if (commit_trans) { | |
3430 | if (trans) | |
3431 | return -EAGAIN; | |
3432 | ||
3433 | trans = btrfs_join_transaction(root, 1); | |
3434 | BUG_ON(IS_ERR(trans)); | |
3435 | ret = btrfs_commit_transaction(trans, root); | |
3436 | return 0; | |
3437 | } | |
3438 | ||
3439 | WARN_ON(1); | |
3440 | printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n", | |
3441 | block_rsv->size, block_rsv->reserved, | |
3442 | block_rsv->freed[0], block_rsv->freed[1]); | |
3443 | ||
3444 | return -ENOSPC; | |
3445 | } | |
3446 | ||
3447 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
3448 | struct btrfs_block_rsv *dst_rsv, | |
3449 | u64 num_bytes) | |
3450 | { | |
3451 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
3452 | } | |
3453 | ||
3454 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
3455 | struct btrfs_block_rsv *block_rsv, | |
3456 | u64 num_bytes) | |
3457 | { | |
3458 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
3459 | if (global_rsv->full || global_rsv == block_rsv || | |
3460 | block_rsv->space_info != global_rsv->space_info) | |
3461 | global_rsv = NULL; | |
3462 | block_rsv_release_bytes(block_rsv, global_rsv, num_bytes); | |
3463 | } | |
3464 | ||
8929ecfa YZ |
3465 | /* |
3466 | * helper to calculate size of global block reservation. | |
3467 | * the desired value is sum of space used by extent tree, | |
3468 | * checksum tree and root tree | |
3469 | */ | |
3470 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) | |
3471 | { | |
3472 | struct btrfs_space_info *sinfo; | |
3473 | u64 num_bytes; | |
3474 | u64 meta_used; | |
3475 | u64 data_used; | |
3476 | int csum_size = btrfs_super_csum_size(&fs_info->super_copy); | |
3477 | #if 0 | |
3478 | /* | |
3479 | * per tree used space accounting can be inaccuracy, so we | |
3480 | * can't rely on it. | |
3481 | */ | |
3482 | spin_lock(&fs_info->extent_root->accounting_lock); | |
3483 | num_bytes = btrfs_root_used(&fs_info->extent_root->root_item); | |
3484 | spin_unlock(&fs_info->extent_root->accounting_lock); | |
3485 | ||
3486 | spin_lock(&fs_info->csum_root->accounting_lock); | |
3487 | num_bytes += btrfs_root_used(&fs_info->csum_root->root_item); | |
3488 | spin_unlock(&fs_info->csum_root->accounting_lock); | |
3489 | ||
3490 | spin_lock(&fs_info->tree_root->accounting_lock); | |
3491 | num_bytes += btrfs_root_used(&fs_info->tree_root->root_item); | |
3492 | spin_unlock(&fs_info->tree_root->accounting_lock); | |
3493 | #endif | |
3494 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); | |
3495 | spin_lock(&sinfo->lock); | |
3496 | data_used = sinfo->bytes_used; | |
3497 | spin_unlock(&sinfo->lock); | |
3498 | ||
3499 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
3500 | spin_lock(&sinfo->lock); | |
3501 | meta_used = sinfo->bytes_used; | |
3502 | spin_unlock(&sinfo->lock); | |
3503 | ||
3504 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * | |
3505 | csum_size * 2; | |
3506 | num_bytes += div64_u64(data_used + meta_used, 50); | |
3507 | ||
3508 | if (num_bytes * 3 > meta_used) | |
3509 | num_bytes = div64_u64(meta_used, 3); | |
3510 | ||
3511 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); | |
3512 | } | |
3513 | ||
3514 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) | |
3515 | { | |
3516 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
3517 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
3518 | u64 num_bytes; | |
3519 | ||
3520 | num_bytes = calc_global_metadata_size(fs_info); | |
3521 | ||
3522 | spin_lock(&block_rsv->lock); | |
3523 | spin_lock(&sinfo->lock); | |
3524 | ||
3525 | block_rsv->size = num_bytes; | |
3526 | ||
3527 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + | |
3528 | sinfo->bytes_reserved + sinfo->bytes_readonly; | |
3529 | ||
3530 | if (sinfo->total_bytes > num_bytes) { | |
3531 | num_bytes = sinfo->total_bytes - num_bytes; | |
3532 | block_rsv->reserved += num_bytes; | |
3533 | sinfo->bytes_reserved += num_bytes; | |
3534 | } | |
3535 | ||
3536 | if (block_rsv->reserved >= block_rsv->size) { | |
3537 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3538 | sinfo->bytes_reserved -= num_bytes; | |
3539 | block_rsv->reserved = block_rsv->size; | |
3540 | block_rsv->full = 1; | |
3541 | } | |
3542 | #if 0 | |
3543 | printk(KERN_INFO"global block rsv size %llu reserved %llu\n", | |
3544 | block_rsv->size, block_rsv->reserved); | |
3545 | #endif | |
3546 | spin_unlock(&sinfo->lock); | |
3547 | spin_unlock(&block_rsv->lock); | |
3548 | } | |
3549 | ||
f0486c68 YZ |
3550 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
3551 | { | |
3552 | struct btrfs_space_info *space_info; | |
3553 | ||
3554 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3555 | fs_info->chunk_block_rsv.space_info = space_info; | |
3556 | fs_info->chunk_block_rsv.priority = 10; | |
3557 | ||
3558 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
8929ecfa YZ |
3559 | fs_info->global_block_rsv.space_info = space_info; |
3560 | fs_info->global_block_rsv.priority = 10; | |
3561 | fs_info->global_block_rsv.refill_used = 1; | |
3562 | fs_info->delalloc_block_rsv.space_info = space_info; | |
f0486c68 YZ |
3563 | fs_info->trans_block_rsv.space_info = space_info; |
3564 | fs_info->empty_block_rsv.space_info = space_info; | |
3565 | fs_info->empty_block_rsv.priority = 10; | |
3566 | ||
8929ecfa YZ |
3567 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
3568 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
3569 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
3570 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 3571 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa YZ |
3572 | |
3573 | btrfs_add_durable_block_rsv(fs_info, &fs_info->global_block_rsv); | |
3574 | ||
3575 | btrfs_add_durable_block_rsv(fs_info, &fs_info->delalloc_block_rsv); | |
3576 | ||
3577 | update_global_block_rsv(fs_info); | |
3578 | } | |
3579 | ||
3580 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) | |
3581 | { | |
3582 | block_rsv_release_bytes(&fs_info->global_block_rsv, NULL, (u64)-1); | |
3583 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); | |
3584 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
3585 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
3586 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
3587 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
3588 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
f0486c68 YZ |
3589 | } |
3590 | ||
a22285a6 YZ |
3591 | static u64 calc_trans_metadata_size(struct btrfs_root *root, int num_items) |
3592 | { | |
3593 | return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * | |
3594 | 3 * num_items; | |
3595 | } | |
3596 | ||
3597 | int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans, | |
3598 | struct btrfs_root *root, | |
3599 | int num_items, int *retries) | |
3600 | { | |
3601 | u64 num_bytes; | |
3602 | int ret; | |
3603 | ||
3604 | if (num_items == 0 || root->fs_info->chunk_root == root) | |
3605 | return 0; | |
3606 | ||
3607 | num_bytes = calc_trans_metadata_size(root, num_items); | |
3608 | ret = btrfs_block_rsv_add(trans, root, &root->fs_info->trans_block_rsv, | |
3609 | num_bytes, retries); | |
3610 | if (!ret) { | |
3611 | trans->bytes_reserved += num_bytes; | |
3612 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
3613 | } | |
3614 | return ret; | |
3615 | } | |
3616 | ||
3617 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, | |
3618 | struct btrfs_root *root) | |
3619 | { | |
3620 | if (!trans->bytes_reserved) | |
3621 | return; | |
3622 | ||
3623 | BUG_ON(trans->block_rsv != &root->fs_info->trans_block_rsv); | |
3624 | btrfs_block_rsv_release(root, trans->block_rsv, | |
3625 | trans->bytes_reserved); | |
3626 | trans->bytes_reserved = 0; | |
3627 | } | |
3628 | ||
3629 | int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, | |
3630 | struct btrfs_pending_snapshot *pending) | |
3631 | { | |
3632 | struct btrfs_root *root = pending->root; | |
3633 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3634 | struct btrfs_block_rsv *dst_rsv = &pending->block_rsv; | |
3635 | /* | |
3636 | * two for root back/forward refs, two for directory entries | |
3637 | * and one for root of the snapshot. | |
3638 | */ | |
3639 | u64 num_bytes = calc_trans_metadata_size(root, 5); | |
3640 | dst_rsv->space_info = src_rsv->space_info; | |
3641 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
3642 | } | |
3643 | ||
0ca1f7ce YZ |
3644 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes) |
3645 | { | |
3646 | return num_bytes >>= 3; | |
3647 | } | |
3648 | ||
3649 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) | |
3650 | { | |
3651 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3652 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
3653 | u64 to_reserve; | |
3654 | int nr_extents; | |
3655 | int retries = 0; | |
3656 | int ret; | |
3657 | ||
3658 | if (btrfs_transaction_in_commit(root->fs_info)) | |
3659 | schedule_timeout(1); | |
3660 | ||
3661 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
3662 | again: | |
3663 | spin_lock(&BTRFS_I(inode)->accounting_lock); | |
3664 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents) + 1; | |
3665 | if (nr_extents > BTRFS_I(inode)->reserved_extents) { | |
3666 | nr_extents -= BTRFS_I(inode)->reserved_extents; | |
3667 | to_reserve = calc_trans_metadata_size(root, nr_extents); | |
3668 | } else { | |
3669 | nr_extents = 0; | |
3670 | to_reserve = 0; | |
3671 | } | |
3672 | ||
3673 | to_reserve += calc_csum_metadata_size(inode, num_bytes); | |
3674 | ret = reserve_metadata_bytes(block_rsv, to_reserve); | |
3675 | if (ret) { | |
3676 | spin_unlock(&BTRFS_I(inode)->accounting_lock); | |
3677 | ret = should_retry_reserve(NULL, root, block_rsv, to_reserve, | |
3678 | &retries); | |
3679 | if (ret > 0) | |
3680 | goto again; | |
3681 | return ret; | |
3682 | } | |
3683 | ||
3684 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
3685 | atomic_inc(&BTRFS_I(inode)->outstanding_extents); | |
3686 | spin_unlock(&BTRFS_I(inode)->accounting_lock); | |
3687 | ||
3688 | block_rsv_add_bytes(block_rsv, to_reserve, 1); | |
3689 | ||
3690 | if (block_rsv->size > 512 * 1024 * 1024) | |
3691 | shrink_delalloc(NULL, root, to_reserve); | |
3692 | ||
3693 | return 0; | |
3694 | } | |
3695 | ||
3696 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) | |
3697 | { | |
3698 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3699 | u64 to_free; | |
3700 | int nr_extents; | |
3701 | ||
3702 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
3703 | atomic_dec(&BTRFS_I(inode)->outstanding_extents); | |
3704 | ||
3705 | spin_lock(&BTRFS_I(inode)->accounting_lock); | |
3706 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents); | |
3707 | if (nr_extents < BTRFS_I(inode)->reserved_extents) { | |
3708 | nr_extents = BTRFS_I(inode)->reserved_extents - nr_extents; | |
3709 | BTRFS_I(inode)->reserved_extents -= nr_extents; | |
3710 | } else { | |
3711 | nr_extents = 0; | |
3712 | } | |
3713 | spin_unlock(&BTRFS_I(inode)->accounting_lock); | |
3714 | ||
3715 | to_free = calc_csum_metadata_size(inode, num_bytes); | |
3716 | if (nr_extents > 0) | |
3717 | to_free += calc_trans_metadata_size(root, nr_extents); | |
3718 | ||
3719 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, | |
3720 | to_free); | |
3721 | } | |
3722 | ||
3723 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) | |
3724 | { | |
3725 | int ret; | |
3726 | ||
3727 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
3728 | if (ret) | |
3729 | return ret; | |
3730 | ||
3731 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
3732 | if (ret) { | |
3733 | btrfs_free_reserved_data_space(inode, num_bytes); | |
3734 | return ret; | |
3735 | } | |
3736 | ||
3737 | return 0; | |
3738 | } | |
3739 | ||
3740 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) | |
3741 | { | |
3742 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
3743 | btrfs_free_reserved_data_space(inode, num_bytes); | |
3744 | } | |
3745 | ||
9078a3e1 CM |
3746 | static int update_block_group(struct btrfs_trans_handle *trans, |
3747 | struct btrfs_root *root, | |
f0486c68 | 3748 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 CM |
3749 | { |
3750 | struct btrfs_block_group_cache *cache; | |
3751 | struct btrfs_fs_info *info = root->fs_info; | |
b742bb82 | 3752 | int factor; |
db94535d | 3753 | u64 total = num_bytes; |
9078a3e1 | 3754 | u64 old_val; |
db94535d | 3755 | u64 byte_in_group; |
3e1ad54f | 3756 | |
5d4f98a2 YZ |
3757 | /* block accounting for super block */ |
3758 | spin_lock(&info->delalloc_lock); | |
3759 | old_val = btrfs_super_bytes_used(&info->super_copy); | |
3760 | if (alloc) | |
3761 | old_val += num_bytes; | |
3762 | else | |
3763 | old_val -= num_bytes; | |
3764 | btrfs_set_super_bytes_used(&info->super_copy, old_val); | |
5d4f98a2 YZ |
3765 | spin_unlock(&info->delalloc_lock); |
3766 | ||
d397712b | 3767 | while (total) { |
db94535d | 3768 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 3769 | if (!cache) |
9078a3e1 | 3770 | return -1; |
b742bb82 YZ |
3771 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
3772 | BTRFS_BLOCK_GROUP_RAID1 | | |
3773 | BTRFS_BLOCK_GROUP_RAID10)) | |
3774 | factor = 2; | |
3775 | else | |
3776 | factor = 1; | |
db94535d CM |
3777 | byte_in_group = bytenr - cache->key.objectid; |
3778 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 3779 | |
25179201 | 3780 | spin_lock(&cache->space_info->lock); |
c286ac48 | 3781 | spin_lock(&cache->lock); |
0f9dd46c | 3782 | cache->dirty = 1; |
9078a3e1 | 3783 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 3784 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 3785 | if (alloc) { |
db94535d | 3786 | old_val += num_bytes; |
11833d66 YZ |
3787 | btrfs_set_block_group_used(&cache->item, old_val); |
3788 | cache->reserved -= num_bytes; | |
11833d66 | 3789 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
3790 | cache->space_info->bytes_used += num_bytes; |
3791 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 3792 | spin_unlock(&cache->lock); |
25179201 | 3793 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 3794 | } else { |
db94535d | 3795 | old_val -= num_bytes; |
b742bb82 | 3796 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
3797 | cache->pinned += num_bytes; |
3798 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 3799 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 3800 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 3801 | spin_unlock(&cache->lock); |
25179201 | 3802 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 3803 | |
f0486c68 YZ |
3804 | set_extent_dirty(info->pinned_extents, |
3805 | bytenr, bytenr + num_bytes - 1, | |
3806 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 3807 | } |
fa9c0d79 | 3808 | btrfs_put_block_group(cache); |
db94535d CM |
3809 | total -= num_bytes; |
3810 | bytenr += num_bytes; | |
9078a3e1 CM |
3811 | } |
3812 | return 0; | |
3813 | } | |
6324fbf3 | 3814 | |
a061fc8d CM |
3815 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
3816 | { | |
0f9dd46c | 3817 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 3818 | u64 bytenr; |
0f9dd46c JB |
3819 | |
3820 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
3821 | if (!cache) | |
a061fc8d | 3822 | return 0; |
0f9dd46c | 3823 | |
d2fb3437 | 3824 | bytenr = cache->key.objectid; |
fa9c0d79 | 3825 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
3826 | |
3827 | return bytenr; | |
a061fc8d CM |
3828 | } |
3829 | ||
f0486c68 YZ |
3830 | static int pin_down_extent(struct btrfs_root *root, |
3831 | struct btrfs_block_group_cache *cache, | |
3832 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 3833 | { |
11833d66 YZ |
3834 | spin_lock(&cache->space_info->lock); |
3835 | spin_lock(&cache->lock); | |
3836 | cache->pinned += num_bytes; | |
3837 | cache->space_info->bytes_pinned += num_bytes; | |
3838 | if (reserved) { | |
3839 | cache->reserved -= num_bytes; | |
3840 | cache->space_info->bytes_reserved -= num_bytes; | |
3841 | } | |
3842 | spin_unlock(&cache->lock); | |
3843 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 3844 | |
f0486c68 YZ |
3845 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
3846 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
3847 | return 0; | |
3848 | } | |
68b38550 | 3849 | |
f0486c68 YZ |
3850 | /* |
3851 | * this function must be called within transaction | |
3852 | */ | |
3853 | int btrfs_pin_extent(struct btrfs_root *root, | |
3854 | u64 bytenr, u64 num_bytes, int reserved) | |
3855 | { | |
3856 | struct btrfs_block_group_cache *cache; | |
3857 | ||
3858 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3859 | BUG_ON(!cache); | |
3860 | ||
3861 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
3862 | ||
3863 | btrfs_put_block_group(cache); | |
11833d66 YZ |
3864 | return 0; |
3865 | } | |
3866 | ||
f0486c68 YZ |
3867 | /* |
3868 | * update size of reserved extents. this function may return -EAGAIN | |
3869 | * if 'reserve' is true or 'sinfo' is false. | |
3870 | */ | |
3871 | static int update_reserved_bytes(struct btrfs_block_group_cache *cache, | |
3872 | u64 num_bytes, int reserve, int sinfo) | |
11833d66 | 3873 | { |
f0486c68 YZ |
3874 | int ret = 0; |
3875 | if (sinfo) { | |
3876 | struct btrfs_space_info *space_info = cache->space_info; | |
3877 | spin_lock(&space_info->lock); | |
3878 | spin_lock(&cache->lock); | |
3879 | if (reserve) { | |
3880 | if (cache->ro) { | |
3881 | ret = -EAGAIN; | |
3882 | } else { | |
3883 | cache->reserved += num_bytes; | |
3884 | space_info->bytes_reserved += num_bytes; | |
3885 | } | |
3886 | } else { | |
3887 | if (cache->ro) | |
3888 | space_info->bytes_readonly += num_bytes; | |
3889 | cache->reserved -= num_bytes; | |
3890 | space_info->bytes_reserved -= num_bytes; | |
3891 | } | |
3892 | spin_unlock(&cache->lock); | |
3893 | spin_unlock(&space_info->lock); | |
11833d66 | 3894 | } else { |
f0486c68 YZ |
3895 | spin_lock(&cache->lock); |
3896 | if (cache->ro) { | |
3897 | ret = -EAGAIN; | |
3898 | } else { | |
3899 | if (reserve) | |
3900 | cache->reserved += num_bytes; | |
3901 | else | |
3902 | cache->reserved -= num_bytes; | |
3903 | } | |
3904 | spin_unlock(&cache->lock); | |
324ae4df | 3905 | } |
f0486c68 | 3906 | return ret; |
324ae4df | 3907 | } |
9078a3e1 | 3908 | |
11833d66 YZ |
3909 | int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
3910 | struct btrfs_root *root) | |
e8569813 | 3911 | { |
e8569813 | 3912 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
3913 | struct btrfs_caching_control *next; |
3914 | struct btrfs_caching_control *caching_ctl; | |
3915 | struct btrfs_block_group_cache *cache; | |
e8569813 | 3916 | |
11833d66 | 3917 | down_write(&fs_info->extent_commit_sem); |
25179201 | 3918 | |
11833d66 YZ |
3919 | list_for_each_entry_safe(caching_ctl, next, |
3920 | &fs_info->caching_block_groups, list) { | |
3921 | cache = caching_ctl->block_group; | |
3922 | if (block_group_cache_done(cache)) { | |
3923 | cache->last_byte_to_unpin = (u64)-1; | |
3924 | list_del_init(&caching_ctl->list); | |
3925 | put_caching_control(caching_ctl); | |
e8569813 | 3926 | } else { |
11833d66 | 3927 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 3928 | } |
e8569813 | 3929 | } |
11833d66 YZ |
3930 | |
3931 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
3932 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
3933 | else | |
3934 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
3935 | ||
3936 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
3937 | |
3938 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
3939 | return 0; |
3940 | } | |
3941 | ||
11833d66 | 3942 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 3943 | { |
11833d66 YZ |
3944 | struct btrfs_fs_info *fs_info = root->fs_info; |
3945 | struct btrfs_block_group_cache *cache = NULL; | |
3946 | u64 len; | |
ccd467d6 | 3947 | |
11833d66 YZ |
3948 | while (start <= end) { |
3949 | if (!cache || | |
3950 | start >= cache->key.objectid + cache->key.offset) { | |
3951 | if (cache) | |
3952 | btrfs_put_block_group(cache); | |
3953 | cache = btrfs_lookup_block_group(fs_info, start); | |
3954 | BUG_ON(!cache); | |
3955 | } | |
3956 | ||
3957 | len = cache->key.objectid + cache->key.offset - start; | |
3958 | len = min(len, end + 1 - start); | |
3959 | ||
3960 | if (start < cache->last_byte_to_unpin) { | |
3961 | len = min(len, cache->last_byte_to_unpin - start); | |
3962 | btrfs_add_free_space(cache, start, len); | |
3963 | } | |
3964 | ||
f0486c68 YZ |
3965 | start += len; |
3966 | ||
11833d66 YZ |
3967 | spin_lock(&cache->space_info->lock); |
3968 | spin_lock(&cache->lock); | |
3969 | cache->pinned -= len; | |
3970 | cache->space_info->bytes_pinned -= len; | |
f0486c68 YZ |
3971 | if (cache->ro) { |
3972 | cache->space_info->bytes_readonly += len; | |
3973 | } else if (cache->reserved_pinned > 0) { | |
3974 | len = min(len, cache->reserved_pinned); | |
3975 | cache->reserved_pinned -= len; | |
3976 | cache->space_info->bytes_reserved += len; | |
3977 | } | |
11833d66 YZ |
3978 | spin_unlock(&cache->lock); |
3979 | spin_unlock(&cache->space_info->lock); | |
ccd467d6 | 3980 | } |
11833d66 YZ |
3981 | |
3982 | if (cache) | |
3983 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
3984 | return 0; |
3985 | } | |
3986 | ||
3987 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 3988 | struct btrfs_root *root) |
a28ec197 | 3989 | { |
11833d66 YZ |
3990 | struct btrfs_fs_info *fs_info = root->fs_info; |
3991 | struct extent_io_tree *unpin; | |
f0486c68 YZ |
3992 | struct btrfs_block_rsv *block_rsv; |
3993 | struct btrfs_block_rsv *next_rsv; | |
1a5bc167 CM |
3994 | u64 start; |
3995 | u64 end; | |
f0486c68 | 3996 | int idx; |
a28ec197 | 3997 | int ret; |
a28ec197 | 3998 | |
11833d66 YZ |
3999 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
4000 | unpin = &fs_info->freed_extents[1]; | |
4001 | else | |
4002 | unpin = &fs_info->freed_extents[0]; | |
4003 | ||
d397712b | 4004 | while (1) { |
1a5bc167 CM |
4005 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
4006 | EXTENT_DIRTY); | |
4007 | if (ret) | |
a28ec197 | 4008 | break; |
1f3c79a2 LH |
4009 | |
4010 | ret = btrfs_discard_extent(root, start, end + 1 - start); | |
4011 | ||
1a5bc167 | 4012 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 4013 | unpin_extent_range(root, start, end); |
b9473439 | 4014 | cond_resched(); |
a28ec197 | 4015 | } |
817d52f8 | 4016 | |
f0486c68 YZ |
4017 | mutex_lock(&fs_info->durable_block_rsv_mutex); |
4018 | list_for_each_entry_safe(block_rsv, next_rsv, | |
4019 | &fs_info->durable_block_rsv_list, list) { | |
31840ae1 | 4020 | |
f0486c68 YZ |
4021 | idx = trans->transid & 0x1; |
4022 | if (block_rsv->freed[idx] > 0) { | |
4023 | block_rsv_add_bytes(block_rsv, | |
4024 | block_rsv->freed[idx], 0); | |
4025 | block_rsv->freed[idx] = 0; | |
4026 | } | |
4027 | if (atomic_read(&block_rsv->usage) == 0) { | |
4028 | btrfs_block_rsv_release(root, block_rsv, (u64)-1); | |
31840ae1 | 4029 | |
f0486c68 YZ |
4030 | if (block_rsv->freed[0] == 0 && |
4031 | block_rsv->freed[1] == 0) { | |
4032 | list_del_init(&block_rsv->list); | |
4033 | kfree(block_rsv); | |
4034 | } | |
4035 | } else { | |
4036 | btrfs_block_rsv_release(root, block_rsv, 0); | |
8ef97622 | 4037 | } |
f4b9aa8d | 4038 | } |
f0486c68 | 4039 | mutex_unlock(&fs_info->durable_block_rsv_mutex); |
31840ae1 | 4040 | |
e20d96d6 CM |
4041 | return 0; |
4042 | } | |
4043 | ||
5d4f98a2 YZ |
4044 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
4045 | struct btrfs_root *root, | |
4046 | u64 bytenr, u64 num_bytes, u64 parent, | |
4047 | u64 root_objectid, u64 owner_objectid, | |
4048 | u64 owner_offset, int refs_to_drop, | |
4049 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 4050 | { |
e2fa7227 | 4051 | struct btrfs_key key; |
5d4f98a2 | 4052 | struct btrfs_path *path; |
1261ec42 CM |
4053 | struct btrfs_fs_info *info = root->fs_info; |
4054 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 4055 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
4056 | struct btrfs_extent_item *ei; |
4057 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 4058 | int ret; |
5d4f98a2 | 4059 | int is_data; |
952fccac CM |
4060 | int extent_slot = 0; |
4061 | int found_extent = 0; | |
4062 | int num_to_del = 1; | |
5d4f98a2 YZ |
4063 | u32 item_size; |
4064 | u64 refs; | |
037e6390 | 4065 | |
5caf2a00 | 4066 | path = btrfs_alloc_path(); |
54aa1f4d CM |
4067 | if (!path) |
4068 | return -ENOMEM; | |
5f26f772 | 4069 | |
3c12ac72 | 4070 | path->reada = 1; |
b9473439 | 4071 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4072 | |
4073 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
4074 | BUG_ON(!is_data && refs_to_drop != 1); | |
4075 | ||
4076 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
4077 | bytenr, num_bytes, parent, | |
4078 | root_objectid, owner_objectid, | |
4079 | owner_offset); | |
7bb86316 | 4080 | if (ret == 0) { |
952fccac | 4081 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
4082 | while (extent_slot >= 0) { |
4083 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 4084 | extent_slot); |
5d4f98a2 | 4085 | if (key.objectid != bytenr) |
952fccac | 4086 | break; |
5d4f98a2 YZ |
4087 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
4088 | key.offset == num_bytes) { | |
952fccac CM |
4089 | found_extent = 1; |
4090 | break; | |
4091 | } | |
4092 | if (path->slots[0] - extent_slot > 5) | |
4093 | break; | |
5d4f98a2 | 4094 | extent_slot--; |
952fccac | 4095 | } |
5d4f98a2 YZ |
4096 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
4097 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
4098 | if (found_extent && item_size < sizeof(*ei)) | |
4099 | found_extent = 0; | |
4100 | #endif | |
31840ae1 | 4101 | if (!found_extent) { |
5d4f98a2 | 4102 | BUG_ON(iref); |
56bec294 | 4103 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
4104 | NULL, refs_to_drop, |
4105 | is_data); | |
31840ae1 ZY |
4106 | BUG_ON(ret); |
4107 | btrfs_release_path(extent_root, path); | |
b9473439 | 4108 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4109 | |
4110 | key.objectid = bytenr; | |
4111 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4112 | key.offset = num_bytes; | |
4113 | ||
31840ae1 ZY |
4114 | ret = btrfs_search_slot(trans, extent_root, |
4115 | &key, path, -1, 1); | |
f3465ca4 JB |
4116 | if (ret) { |
4117 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
4118 | ", was looking for %llu\n", ret, |
4119 | (unsigned long long)bytenr); | |
f3465ca4 JB |
4120 | btrfs_print_leaf(extent_root, path->nodes[0]); |
4121 | } | |
31840ae1 ZY |
4122 | BUG_ON(ret); |
4123 | extent_slot = path->slots[0]; | |
4124 | } | |
7bb86316 CM |
4125 | } else { |
4126 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4127 | WARN_ON(1); | |
d397712b | 4128 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 4129 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 4130 | (unsigned long long)bytenr, |
56bec294 | 4131 | (unsigned long long)parent, |
d397712b | 4132 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
4133 | (unsigned long long)owner_objectid, |
4134 | (unsigned long long)owner_offset); | |
7bb86316 | 4135 | } |
5f39d397 CM |
4136 | |
4137 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
4138 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
4139 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
4140 | if (item_size < sizeof(*ei)) { | |
4141 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
4142 | ret = convert_extent_item_v0(trans, extent_root, path, | |
4143 | owner_objectid, 0); | |
4144 | BUG_ON(ret < 0); | |
4145 | ||
4146 | btrfs_release_path(extent_root, path); | |
4147 | path->leave_spinning = 1; | |
4148 | ||
4149 | key.objectid = bytenr; | |
4150 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4151 | key.offset = num_bytes; | |
4152 | ||
4153 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
4154 | -1, 1); | |
4155 | if (ret) { | |
4156 | printk(KERN_ERR "umm, got %d back from search" | |
4157 | ", was looking for %llu\n", ret, | |
4158 | (unsigned long long)bytenr); | |
4159 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4160 | } | |
4161 | BUG_ON(ret); | |
4162 | extent_slot = path->slots[0]; | |
4163 | leaf = path->nodes[0]; | |
4164 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
4165 | } | |
4166 | #endif | |
4167 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 4168 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 4169 | struct btrfs_extent_item); |
5d4f98a2 YZ |
4170 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
4171 | struct btrfs_tree_block_info *bi; | |
4172 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
4173 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
4174 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
4175 | } | |
56bec294 | 4176 | |
5d4f98a2 | 4177 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
4178 | BUG_ON(refs < refs_to_drop); |
4179 | refs -= refs_to_drop; | |
5f39d397 | 4180 | |
5d4f98a2 YZ |
4181 | if (refs > 0) { |
4182 | if (extent_op) | |
4183 | __run_delayed_extent_op(extent_op, leaf, ei); | |
4184 | /* | |
4185 | * In the case of inline back ref, reference count will | |
4186 | * be updated by remove_extent_backref | |
952fccac | 4187 | */ |
5d4f98a2 YZ |
4188 | if (iref) { |
4189 | BUG_ON(!found_extent); | |
4190 | } else { | |
4191 | btrfs_set_extent_refs(leaf, ei, refs); | |
4192 | btrfs_mark_buffer_dirty(leaf); | |
4193 | } | |
4194 | if (found_extent) { | |
4195 | ret = remove_extent_backref(trans, extent_root, path, | |
4196 | iref, refs_to_drop, | |
4197 | is_data); | |
952fccac CM |
4198 | BUG_ON(ret); |
4199 | } | |
5d4f98a2 | 4200 | } else { |
5d4f98a2 YZ |
4201 | if (found_extent) { |
4202 | BUG_ON(is_data && refs_to_drop != | |
4203 | extent_data_ref_count(root, path, iref)); | |
4204 | if (iref) { | |
4205 | BUG_ON(path->slots[0] != extent_slot); | |
4206 | } else { | |
4207 | BUG_ON(path->slots[0] != extent_slot + 1); | |
4208 | path->slots[0] = extent_slot; | |
4209 | num_to_del = 2; | |
4210 | } | |
78fae27e | 4211 | } |
b9473439 | 4212 | |
952fccac CM |
4213 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
4214 | num_to_del); | |
31840ae1 | 4215 | BUG_ON(ret); |
25179201 | 4216 | btrfs_release_path(extent_root, path); |
21af804c | 4217 | |
5d4f98a2 | 4218 | if (is_data) { |
459931ec CM |
4219 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
4220 | BUG_ON(ret); | |
d57e62b8 CM |
4221 | } else { |
4222 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
4223 | bytenr >> PAGE_CACHE_SHIFT, | |
4224 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
4225 | } |
4226 | ||
f0486c68 | 4227 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
dcbdd4dc | 4228 | BUG_ON(ret); |
a28ec197 | 4229 | } |
5caf2a00 | 4230 | btrfs_free_path(path); |
a28ec197 CM |
4231 | return ret; |
4232 | } | |
4233 | ||
1887be66 | 4234 | /* |
f0486c68 | 4235 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
4236 | * delayed ref for that extent as well. This searches the delayed ref tree for |
4237 | * a given extent, and if there are no other delayed refs to be processed, it | |
4238 | * removes it from the tree. | |
4239 | */ | |
4240 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
4241 | struct btrfs_root *root, u64 bytenr) | |
4242 | { | |
4243 | struct btrfs_delayed_ref_head *head; | |
4244 | struct btrfs_delayed_ref_root *delayed_refs; | |
4245 | struct btrfs_delayed_ref_node *ref; | |
4246 | struct rb_node *node; | |
f0486c68 | 4247 | int ret = 0; |
1887be66 CM |
4248 | |
4249 | delayed_refs = &trans->transaction->delayed_refs; | |
4250 | spin_lock(&delayed_refs->lock); | |
4251 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
4252 | if (!head) | |
4253 | goto out; | |
4254 | ||
4255 | node = rb_prev(&head->node.rb_node); | |
4256 | if (!node) | |
4257 | goto out; | |
4258 | ||
4259 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
4260 | ||
4261 | /* there are still entries for this ref, we can't drop it */ | |
4262 | if (ref->bytenr == bytenr) | |
4263 | goto out; | |
4264 | ||
5d4f98a2 YZ |
4265 | if (head->extent_op) { |
4266 | if (!head->must_insert_reserved) | |
4267 | goto out; | |
4268 | kfree(head->extent_op); | |
4269 | head->extent_op = NULL; | |
4270 | } | |
4271 | ||
1887be66 CM |
4272 | /* |
4273 | * waiting for the lock here would deadlock. If someone else has it | |
4274 | * locked they are already in the process of dropping it anyway | |
4275 | */ | |
4276 | if (!mutex_trylock(&head->mutex)) | |
4277 | goto out; | |
4278 | ||
4279 | /* | |
4280 | * at this point we have a head with no other entries. Go | |
4281 | * ahead and process it. | |
4282 | */ | |
4283 | head->node.in_tree = 0; | |
4284 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 4285 | |
1887be66 CM |
4286 | delayed_refs->num_entries--; |
4287 | ||
4288 | /* | |
4289 | * we don't take a ref on the node because we're removing it from the | |
4290 | * tree, so we just steal the ref the tree was holding. | |
4291 | */ | |
c3e69d58 CM |
4292 | delayed_refs->num_heads--; |
4293 | if (list_empty(&head->cluster)) | |
4294 | delayed_refs->num_heads_ready--; | |
4295 | ||
4296 | list_del_init(&head->cluster); | |
1887be66 CM |
4297 | spin_unlock(&delayed_refs->lock); |
4298 | ||
f0486c68 YZ |
4299 | BUG_ON(head->extent_op); |
4300 | if (head->must_insert_reserved) | |
4301 | ret = 1; | |
4302 | ||
4303 | mutex_unlock(&head->mutex); | |
1887be66 | 4304 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 4305 | return ret; |
1887be66 CM |
4306 | out: |
4307 | spin_unlock(&delayed_refs->lock); | |
4308 | return 0; | |
4309 | } | |
4310 | ||
f0486c68 YZ |
4311 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
4312 | struct btrfs_root *root, | |
4313 | struct extent_buffer *buf, | |
4314 | u64 parent, int last_ref) | |
4315 | { | |
4316 | struct btrfs_block_rsv *block_rsv; | |
4317 | struct btrfs_block_group_cache *cache = NULL; | |
4318 | int ret; | |
4319 | ||
4320 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4321 | ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, | |
4322 | parent, root->root_key.objectid, | |
4323 | btrfs_header_level(buf), | |
4324 | BTRFS_DROP_DELAYED_REF, NULL); | |
4325 | BUG_ON(ret); | |
4326 | } | |
4327 | ||
4328 | if (!last_ref) | |
4329 | return; | |
4330 | ||
4331 | block_rsv = get_block_rsv(trans, root); | |
4332 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); | |
4333 | BUG_ON(block_rsv->space_info != cache->space_info); | |
4334 | ||
4335 | if (btrfs_header_generation(buf) == trans->transid) { | |
4336 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4337 | ret = check_ref_cleanup(trans, root, buf->start); | |
4338 | if (!ret) | |
4339 | goto pin; | |
4340 | } | |
4341 | ||
4342 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
4343 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
4344 | goto pin; | |
4345 | } | |
4346 | ||
4347 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
4348 | ||
4349 | btrfs_add_free_space(cache, buf->start, buf->len); | |
4350 | ret = update_reserved_bytes(cache, buf->len, 0, 0); | |
4351 | if (ret == -EAGAIN) { | |
4352 | /* block group became read-only */ | |
4353 | update_reserved_bytes(cache, buf->len, 0, 1); | |
4354 | goto out; | |
4355 | } | |
4356 | ||
4357 | ret = 1; | |
4358 | spin_lock(&block_rsv->lock); | |
4359 | if (block_rsv->reserved < block_rsv->size) { | |
4360 | block_rsv->reserved += buf->len; | |
4361 | ret = 0; | |
4362 | } | |
4363 | spin_unlock(&block_rsv->lock); | |
4364 | ||
4365 | if (ret) { | |
4366 | spin_lock(&cache->space_info->lock); | |
4367 | cache->space_info->bytes_reserved -= buf->len; | |
4368 | spin_unlock(&cache->space_info->lock); | |
4369 | } | |
4370 | goto out; | |
4371 | } | |
4372 | pin: | |
4373 | if (block_rsv->durable && !cache->ro) { | |
4374 | ret = 0; | |
4375 | spin_lock(&cache->lock); | |
4376 | if (!cache->ro) { | |
4377 | cache->reserved_pinned += buf->len; | |
4378 | ret = 1; | |
4379 | } | |
4380 | spin_unlock(&cache->lock); | |
4381 | ||
4382 | if (ret) { | |
4383 | spin_lock(&block_rsv->lock); | |
4384 | block_rsv->freed[trans->transid & 0x1] += buf->len; | |
4385 | spin_unlock(&block_rsv->lock); | |
4386 | } | |
4387 | } | |
4388 | out: | |
4389 | btrfs_put_block_group(cache); | |
4390 | } | |
4391 | ||
925baedd | 4392 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
4393 | struct btrfs_root *root, |
4394 | u64 bytenr, u64 num_bytes, u64 parent, | |
5d4f98a2 | 4395 | u64 root_objectid, u64 owner, u64 offset) |
925baedd CM |
4396 | { |
4397 | int ret; | |
4398 | ||
56bec294 CM |
4399 | /* |
4400 | * tree log blocks never actually go into the extent allocation | |
4401 | * tree, just update pinning info and exit early. | |
56bec294 | 4402 | */ |
5d4f98a2 YZ |
4403 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
4404 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 4405 | /* unlocks the pinned mutex */ |
11833d66 | 4406 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 4407 | ret = 0; |
5d4f98a2 YZ |
4408 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
4409 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
4410 | parent, root_objectid, (int)owner, | |
4411 | BTRFS_DROP_DELAYED_REF, NULL); | |
1887be66 | 4412 | BUG_ON(ret); |
5d4f98a2 YZ |
4413 | } else { |
4414 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
4415 | parent, root_objectid, owner, | |
4416 | offset, BTRFS_DROP_DELAYED_REF, NULL); | |
4417 | BUG_ON(ret); | |
56bec294 | 4418 | } |
925baedd CM |
4419 | return ret; |
4420 | } | |
4421 | ||
87ee04eb CM |
4422 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
4423 | { | |
4424 | u64 mask = ((u64)root->stripesize - 1); | |
4425 | u64 ret = (val + mask) & ~mask; | |
4426 | return ret; | |
4427 | } | |
4428 | ||
817d52f8 JB |
4429 | /* |
4430 | * when we wait for progress in the block group caching, its because | |
4431 | * our allocation attempt failed at least once. So, we must sleep | |
4432 | * and let some progress happen before we try again. | |
4433 | * | |
4434 | * This function will sleep at least once waiting for new free space to | |
4435 | * show up, and then it will check the block group free space numbers | |
4436 | * for our min num_bytes. Another option is to have it go ahead | |
4437 | * and look in the rbtree for a free extent of a given size, but this | |
4438 | * is a good start. | |
4439 | */ | |
4440 | static noinline int | |
4441 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
4442 | u64 num_bytes) | |
4443 | { | |
11833d66 | 4444 | struct btrfs_caching_control *caching_ctl; |
817d52f8 JB |
4445 | DEFINE_WAIT(wait); |
4446 | ||
11833d66 YZ |
4447 | caching_ctl = get_caching_control(cache); |
4448 | if (!caching_ctl) | |
817d52f8 | 4449 | return 0; |
817d52f8 | 4450 | |
11833d66 | 4451 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
817d52f8 | 4452 | (cache->free_space >= num_bytes)); |
11833d66 YZ |
4453 | |
4454 | put_caching_control(caching_ctl); | |
4455 | return 0; | |
4456 | } | |
4457 | ||
4458 | static noinline int | |
4459 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
4460 | { | |
4461 | struct btrfs_caching_control *caching_ctl; | |
4462 | DEFINE_WAIT(wait); | |
4463 | ||
4464 | caching_ctl = get_caching_control(cache); | |
4465 | if (!caching_ctl) | |
4466 | return 0; | |
4467 | ||
4468 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
4469 | ||
4470 | put_caching_control(caching_ctl); | |
817d52f8 JB |
4471 | return 0; |
4472 | } | |
4473 | ||
b742bb82 YZ |
4474 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
4475 | { | |
4476 | int index; | |
4477 | if (cache->flags & BTRFS_BLOCK_GROUP_RAID10) | |
4478 | index = 0; | |
4479 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1) | |
4480 | index = 1; | |
4481 | else if (cache->flags & BTRFS_BLOCK_GROUP_DUP) | |
4482 | index = 2; | |
4483 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) | |
4484 | index = 3; | |
4485 | else | |
4486 | index = 4; | |
4487 | return index; | |
4488 | } | |
4489 | ||
817d52f8 | 4490 | enum btrfs_loop_type { |
ccf0e725 | 4491 | LOOP_FIND_IDEAL = 0, |
817d52f8 JB |
4492 | LOOP_CACHING_NOWAIT = 1, |
4493 | LOOP_CACHING_WAIT = 2, | |
4494 | LOOP_ALLOC_CHUNK = 3, | |
4495 | LOOP_NO_EMPTY_SIZE = 4, | |
4496 | }; | |
4497 | ||
fec577fb CM |
4498 | /* |
4499 | * walks the btree of allocated extents and find a hole of a given size. | |
4500 | * The key ins is changed to record the hole: | |
4501 | * ins->objectid == block start | |
62e2749e | 4502 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
4503 | * ins->offset == number of blocks |
4504 | * Any available blocks before search_start are skipped. | |
4505 | */ | |
d397712b | 4506 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
4507 | struct btrfs_root *orig_root, |
4508 | u64 num_bytes, u64 empty_size, | |
4509 | u64 search_start, u64 search_end, | |
4510 | u64 hint_byte, struct btrfs_key *ins, | |
98ed5174 | 4511 | int data) |
fec577fb | 4512 | { |
80eb234a | 4513 | int ret = 0; |
d397712b | 4514 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 4515 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 4516 | struct btrfs_block_group_cache *block_group = NULL; |
239b14b3 | 4517 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 4518 | int allowed_chunk_alloc = 0; |
ccf0e725 | 4519 | int done_chunk_alloc = 0; |
80eb234a | 4520 | struct btrfs_space_info *space_info; |
fa9c0d79 CM |
4521 | int last_ptr_loop = 0; |
4522 | int loop = 0; | |
f0486c68 | 4523 | int index = 0; |
817d52f8 | 4524 | bool found_uncached_bg = false; |
0a24325e | 4525 | bool failed_cluster_refill = false; |
1cdda9b8 | 4526 | bool failed_alloc = false; |
ccf0e725 JB |
4527 | u64 ideal_cache_percent = 0; |
4528 | u64 ideal_cache_offset = 0; | |
fec577fb | 4529 | |
db94535d | 4530 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 4531 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
4532 | ins->objectid = 0; |
4533 | ins->offset = 0; | |
b1a4d965 | 4534 | |
2552d17e | 4535 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 JB |
4536 | if (!space_info) { |
4537 | printk(KERN_ERR "No space info for %d\n", data); | |
4538 | return -ENOSPC; | |
4539 | } | |
2552d17e | 4540 | |
0ef3e66b CM |
4541 | if (orig_root->ref_cows || empty_size) |
4542 | allowed_chunk_alloc = 1; | |
4543 | ||
239b14b3 | 4544 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
fa9c0d79 | 4545 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
4546 | if (!btrfs_test_opt(root, SSD)) |
4547 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
4548 | } |
4549 | ||
fa9c0d79 CM |
4550 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) { |
4551 | last_ptr = &root->fs_info->data_alloc_cluster; | |
4552 | } | |
0f9dd46c | 4553 | |
239b14b3 | 4554 | if (last_ptr) { |
fa9c0d79 CM |
4555 | spin_lock(&last_ptr->lock); |
4556 | if (last_ptr->block_group) | |
4557 | hint_byte = last_ptr->window_start; | |
4558 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 4559 | } |
fa9c0d79 | 4560 | |
a061fc8d | 4561 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 4562 | search_start = max(search_start, hint_byte); |
0b86a832 | 4563 | |
817d52f8 | 4564 | if (!last_ptr) |
fa9c0d79 | 4565 | empty_cluster = 0; |
fa9c0d79 | 4566 | |
2552d17e | 4567 | if (search_start == hint_byte) { |
ccf0e725 | 4568 | ideal_cache: |
2552d17e JB |
4569 | block_group = btrfs_lookup_block_group(root->fs_info, |
4570 | search_start); | |
817d52f8 JB |
4571 | /* |
4572 | * we don't want to use the block group if it doesn't match our | |
4573 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
4574 | * |
4575 | * However if we are re-searching with an ideal block group | |
4576 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
4577 | */ |
4578 | if (block_group && block_group_bits(block_group, data) && | |
ccf0e725 JB |
4579 | (block_group->cached != BTRFS_CACHE_NO || |
4580 | search_start == ideal_cache_offset)) { | |
2552d17e | 4581 | down_read(&space_info->groups_sem); |
44fb5511 CM |
4582 | if (list_empty(&block_group->list) || |
4583 | block_group->ro) { | |
4584 | /* | |
4585 | * someone is removing this block group, | |
4586 | * we can't jump into the have_block_group | |
4587 | * target because our list pointers are not | |
4588 | * valid | |
4589 | */ | |
4590 | btrfs_put_block_group(block_group); | |
4591 | up_read(&space_info->groups_sem); | |
ccf0e725 | 4592 | } else { |
b742bb82 | 4593 | index = get_block_group_index(block_group); |
44fb5511 | 4594 | goto have_block_group; |
ccf0e725 | 4595 | } |
2552d17e | 4596 | } else if (block_group) { |
fa9c0d79 | 4597 | btrfs_put_block_group(block_group); |
2552d17e | 4598 | } |
42e70e7a | 4599 | } |
2552d17e | 4600 | search: |
80eb234a | 4601 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
4602 | list_for_each_entry(block_group, &space_info->block_groups[index], |
4603 | list) { | |
6226cb0a | 4604 | u64 offset; |
817d52f8 | 4605 | int cached; |
8a1413a2 | 4606 | |
11dfe35a | 4607 | btrfs_get_block_group(block_group); |
2552d17e | 4608 | search_start = block_group->key.objectid; |
42e70e7a | 4609 | |
2552d17e | 4610 | have_block_group: |
817d52f8 | 4611 | if (unlikely(block_group->cached == BTRFS_CACHE_NO)) { |
ccf0e725 JB |
4612 | u64 free_percent; |
4613 | ||
4614 | free_percent = btrfs_block_group_used(&block_group->item); | |
4615 | free_percent *= 100; | |
4616 | free_percent = div64_u64(free_percent, | |
4617 | block_group->key.offset); | |
4618 | free_percent = 100 - free_percent; | |
4619 | if (free_percent > ideal_cache_percent && | |
4620 | likely(!block_group->ro)) { | |
4621 | ideal_cache_offset = block_group->key.objectid; | |
4622 | ideal_cache_percent = free_percent; | |
4623 | } | |
4624 | ||
817d52f8 | 4625 | /* |
ccf0e725 JB |
4626 | * We only want to start kthread caching if we are at |
4627 | * the point where we will wait for caching to make | |
4628 | * progress, or if our ideal search is over and we've | |
4629 | * found somebody to start caching. | |
817d52f8 JB |
4630 | */ |
4631 | if (loop > LOOP_CACHING_NOWAIT || | |
ccf0e725 JB |
4632 | (loop > LOOP_FIND_IDEAL && |
4633 | atomic_read(&space_info->caching_threads) < 2)) { | |
817d52f8 JB |
4634 | ret = cache_block_group(block_group); |
4635 | BUG_ON(ret); | |
2552d17e | 4636 | } |
817d52f8 JB |
4637 | found_uncached_bg = true; |
4638 | ||
ccf0e725 JB |
4639 | /* |
4640 | * If loop is set for cached only, try the next block | |
4641 | * group. | |
4642 | */ | |
4643 | if (loop == LOOP_FIND_IDEAL) | |
817d52f8 JB |
4644 | goto loop; |
4645 | } | |
4646 | ||
ccf0e725 JB |
4647 | cached = block_group_cache_done(block_group); |
4648 | if (unlikely(!cached)) | |
4649 | found_uncached_bg = true; | |
4650 | ||
ea6a478e | 4651 | if (unlikely(block_group->ro)) |
2552d17e | 4652 | goto loop; |
0f9dd46c | 4653 | |
0a24325e JB |
4654 | /* |
4655 | * Ok we want to try and use the cluster allocator, so lets look | |
4656 | * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will | |
4657 | * have tried the cluster allocator plenty of times at this | |
4658 | * point and not have found anything, so we are likely way too | |
4659 | * fragmented for the clustering stuff to find anything, so lets | |
4660 | * just skip it and let the allocator find whatever block it can | |
4661 | * find | |
4662 | */ | |
4663 | if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) { | |
fa9c0d79 CM |
4664 | /* |
4665 | * the refill lock keeps out other | |
4666 | * people trying to start a new cluster | |
4667 | */ | |
4668 | spin_lock(&last_ptr->refill_lock); | |
44fb5511 CM |
4669 | if (last_ptr->block_group && |
4670 | (last_ptr->block_group->ro || | |
4671 | !block_group_bits(last_ptr->block_group, data))) { | |
4672 | offset = 0; | |
4673 | goto refill_cluster; | |
4674 | } | |
4675 | ||
fa9c0d79 CM |
4676 | offset = btrfs_alloc_from_cluster(block_group, last_ptr, |
4677 | num_bytes, search_start); | |
4678 | if (offset) { | |
4679 | /* we have a block, we're done */ | |
4680 | spin_unlock(&last_ptr->refill_lock); | |
4681 | goto checks; | |
4682 | } | |
4683 | ||
4684 | spin_lock(&last_ptr->lock); | |
4685 | /* | |
4686 | * whoops, this cluster doesn't actually point to | |
4687 | * this block group. Get a ref on the block | |
4688 | * group is does point to and try again | |
4689 | */ | |
4690 | if (!last_ptr_loop && last_ptr->block_group && | |
4691 | last_ptr->block_group != block_group) { | |
4692 | ||
4693 | btrfs_put_block_group(block_group); | |
4694 | block_group = last_ptr->block_group; | |
11dfe35a | 4695 | btrfs_get_block_group(block_group); |
fa9c0d79 CM |
4696 | spin_unlock(&last_ptr->lock); |
4697 | spin_unlock(&last_ptr->refill_lock); | |
4698 | ||
4699 | last_ptr_loop = 1; | |
4700 | search_start = block_group->key.objectid; | |
44fb5511 CM |
4701 | /* |
4702 | * we know this block group is properly | |
4703 | * in the list because | |
4704 | * btrfs_remove_block_group, drops the | |
4705 | * cluster before it removes the block | |
4706 | * group from the list | |
4707 | */ | |
fa9c0d79 CM |
4708 | goto have_block_group; |
4709 | } | |
4710 | spin_unlock(&last_ptr->lock); | |
44fb5511 | 4711 | refill_cluster: |
fa9c0d79 CM |
4712 | /* |
4713 | * this cluster didn't work out, free it and | |
4714 | * start over | |
4715 | */ | |
4716 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
4717 | ||
4718 | last_ptr_loop = 0; | |
4719 | ||
4720 | /* allocate a cluster in this block group */ | |
451d7585 | 4721 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 CM |
4722 | block_group, last_ptr, |
4723 | offset, num_bytes, | |
4724 | empty_cluster + empty_size); | |
4725 | if (ret == 0) { | |
4726 | /* | |
4727 | * now pull our allocation out of this | |
4728 | * cluster | |
4729 | */ | |
4730 | offset = btrfs_alloc_from_cluster(block_group, | |
4731 | last_ptr, num_bytes, | |
4732 | search_start); | |
4733 | if (offset) { | |
4734 | /* we found one, proceed */ | |
4735 | spin_unlock(&last_ptr->refill_lock); | |
4736 | goto checks; | |
4737 | } | |
0a24325e JB |
4738 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
4739 | && !failed_cluster_refill) { | |
817d52f8 JB |
4740 | spin_unlock(&last_ptr->refill_lock); |
4741 | ||
0a24325e | 4742 | failed_cluster_refill = true; |
817d52f8 JB |
4743 | wait_block_group_cache_progress(block_group, |
4744 | num_bytes + empty_cluster + empty_size); | |
4745 | goto have_block_group; | |
fa9c0d79 | 4746 | } |
817d52f8 | 4747 | |
fa9c0d79 CM |
4748 | /* |
4749 | * at this point we either didn't find a cluster | |
4750 | * or we weren't able to allocate a block from our | |
4751 | * cluster. Free the cluster we've been trying | |
4752 | * to use, and go to the next block group | |
4753 | */ | |
0a24325e | 4754 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 4755 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 4756 | goto loop; |
fa9c0d79 CM |
4757 | } |
4758 | ||
6226cb0a JB |
4759 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
4760 | num_bytes, empty_size); | |
1cdda9b8 JB |
4761 | /* |
4762 | * If we didn't find a chunk, and we haven't failed on this | |
4763 | * block group before, and this block group is in the middle of | |
4764 | * caching and we are ok with waiting, then go ahead and wait | |
4765 | * for progress to be made, and set failed_alloc to true. | |
4766 | * | |
4767 | * If failed_alloc is true then we've already waited on this | |
4768 | * block group once and should move on to the next block group. | |
4769 | */ | |
4770 | if (!offset && !failed_alloc && !cached && | |
4771 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 4772 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
4773 | num_bytes + empty_size); |
4774 | failed_alloc = true; | |
817d52f8 | 4775 | goto have_block_group; |
1cdda9b8 JB |
4776 | } else if (!offset) { |
4777 | goto loop; | |
817d52f8 | 4778 | } |
fa9c0d79 | 4779 | checks: |
6226cb0a | 4780 | search_start = stripe_align(root, offset); |
2552d17e | 4781 | /* move on to the next group */ |
6226cb0a JB |
4782 | if (search_start + num_bytes >= search_end) { |
4783 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 4784 | goto loop; |
6226cb0a | 4785 | } |
25179201 | 4786 | |
2552d17e JB |
4787 | /* move on to the next group */ |
4788 | if (search_start + num_bytes > | |
6226cb0a JB |
4789 | block_group->key.objectid + block_group->key.offset) { |
4790 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 4791 | goto loop; |
6226cb0a | 4792 | } |
f5a31e16 | 4793 | |
f0486c68 YZ |
4794 | ins->objectid = search_start; |
4795 | ins->offset = num_bytes; | |
2552d17e | 4796 | |
f0486c68 YZ |
4797 | if (offset < search_start) |
4798 | btrfs_add_free_space(block_group, offset, | |
4799 | search_start - offset); | |
4800 | BUG_ON(offset > search_start); | |
4801 | ||
4802 | ret = update_reserved_bytes(block_group, num_bytes, 1, | |
4803 | (data & BTRFS_BLOCK_GROUP_DATA)); | |
4804 | if (ret == -EAGAIN) { | |
6226cb0a | 4805 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 4806 | goto loop; |
0f9dd46c | 4807 | } |
0b86a832 | 4808 | |
f0486c68 | 4809 | /* we are all good, lets return */ |
2552d17e JB |
4810 | ins->objectid = search_start; |
4811 | ins->offset = num_bytes; | |
d2fb3437 | 4812 | |
6226cb0a JB |
4813 | if (offset < search_start) |
4814 | btrfs_add_free_space(block_group, offset, | |
4815 | search_start - offset); | |
4816 | BUG_ON(offset > search_start); | |
2552d17e JB |
4817 | break; |
4818 | loop: | |
0a24325e | 4819 | failed_cluster_refill = false; |
1cdda9b8 | 4820 | failed_alloc = false; |
b742bb82 | 4821 | BUG_ON(index != get_block_group_index(block_group)); |
fa9c0d79 | 4822 | btrfs_put_block_group(block_group); |
2552d17e JB |
4823 | } |
4824 | up_read(&space_info->groups_sem); | |
4825 | ||
b742bb82 YZ |
4826 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
4827 | goto search; | |
4828 | ||
ccf0e725 JB |
4829 | /* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for |
4830 | * for them to make caching progress. Also | |
4831 | * determine the best possible bg to cache | |
4832 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
4833 | * caching kthreads as we move along | |
817d52f8 JB |
4834 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
4835 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
4836 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
4837 | * again | |
fa9c0d79 | 4838 | */ |
817d52f8 JB |
4839 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE && |
4840 | (found_uncached_bg || empty_size || empty_cluster || | |
4841 | allowed_chunk_alloc)) { | |
b742bb82 | 4842 | index = 0; |
ccf0e725 | 4843 | if (loop == LOOP_FIND_IDEAL && found_uncached_bg) { |
817d52f8 | 4844 | found_uncached_bg = false; |
ccf0e725 JB |
4845 | loop++; |
4846 | if (!ideal_cache_percent && | |
4847 | atomic_read(&space_info->caching_threads)) | |
817d52f8 | 4848 | goto search; |
ccf0e725 JB |
4849 | |
4850 | /* | |
4851 | * 1 of the following 2 things have happened so far | |
4852 | * | |
4853 | * 1) We found an ideal block group for caching that | |
4854 | * is mostly full and will cache quickly, so we might | |
4855 | * as well wait for it. | |
4856 | * | |
4857 | * 2) We searched for cached only and we didn't find | |
4858 | * anything, and we didn't start any caching kthreads | |
4859 | * either, so chances are we will loop through and | |
4860 | * start a couple caching kthreads, and then come back | |
4861 | * around and just wait for them. This will be slower | |
4862 | * because we will have 2 caching kthreads reading at | |
4863 | * the same time when we could have just started one | |
4864 | * and waited for it to get far enough to give us an | |
4865 | * allocation, so go ahead and go to the wait caching | |
4866 | * loop. | |
4867 | */ | |
4868 | loop = LOOP_CACHING_WAIT; | |
4869 | search_start = ideal_cache_offset; | |
4870 | ideal_cache_percent = 0; | |
4871 | goto ideal_cache; | |
4872 | } else if (loop == LOOP_FIND_IDEAL) { | |
4873 | /* | |
4874 | * Didn't find a uncached bg, wait on anything we find | |
4875 | * next. | |
4876 | */ | |
4877 | loop = LOOP_CACHING_WAIT; | |
4878 | goto search; | |
4879 | } | |
4880 | ||
4881 | if (loop < LOOP_CACHING_WAIT) { | |
4882 | loop++; | |
4883 | goto search; | |
817d52f8 JB |
4884 | } |
4885 | ||
4886 | if (loop == LOOP_ALLOC_CHUNK) { | |
fa9c0d79 CM |
4887 | empty_size = 0; |
4888 | empty_cluster = 0; | |
4889 | } | |
2552d17e JB |
4890 | |
4891 | if (allowed_chunk_alloc) { | |
4892 | ret = do_chunk_alloc(trans, root, num_bytes + | |
4893 | 2 * 1024 * 1024, data, 1); | |
2552d17e | 4894 | allowed_chunk_alloc = 0; |
ccf0e725 JB |
4895 | done_chunk_alloc = 1; |
4896 | } else if (!done_chunk_alloc) { | |
2552d17e JB |
4897 | space_info->force_alloc = 1; |
4898 | } | |
4899 | ||
817d52f8 | 4900 | if (loop < LOOP_NO_EMPTY_SIZE) { |
fa9c0d79 | 4901 | loop++; |
2552d17e | 4902 | goto search; |
fa9c0d79 | 4903 | } |
2552d17e JB |
4904 | ret = -ENOSPC; |
4905 | } else if (!ins->objectid) { | |
4906 | ret = -ENOSPC; | |
f2654de4 | 4907 | } |
0b86a832 | 4908 | |
80eb234a JB |
4909 | /* we found what we needed */ |
4910 | if (ins->objectid) { | |
4911 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
d2fb3437 | 4912 | trans->block_group = block_group->key.objectid; |
0f9dd46c | 4913 | |
fa9c0d79 | 4914 | btrfs_put_block_group(block_group); |
80eb234a | 4915 | ret = 0; |
be744175 | 4916 | } |
be744175 | 4917 | |
0f70abe2 | 4918 | return ret; |
fec577fb | 4919 | } |
ec44a35c | 4920 | |
9ed74f2d JB |
4921 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
4922 | int dump_block_groups) | |
0f9dd46c JB |
4923 | { |
4924 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 4925 | int index = 0; |
0f9dd46c | 4926 | |
9ed74f2d | 4927 | spin_lock(&info->lock); |
d397712b CM |
4928 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
4929 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
9ed74f2d | 4930 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 4931 | info->bytes_readonly), |
d397712b | 4932 | (info->full) ? "" : "not "); |
8929ecfa YZ |
4933 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
4934 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 4935 | (unsigned long long)info->total_bytes, |
8929ecfa | 4936 | (unsigned long long)info->bytes_used, |
21380931 | 4937 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 4938 | (unsigned long long)info->bytes_reserved, |
21380931 | 4939 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 4940 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
4941 | spin_unlock(&info->lock); |
4942 | ||
4943 | if (!dump_block_groups) | |
4944 | return; | |
0f9dd46c | 4945 | |
80eb234a | 4946 | down_read(&info->groups_sem); |
b742bb82 YZ |
4947 | again: |
4948 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 4949 | spin_lock(&cache->lock); |
d397712b CM |
4950 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
4951 | "%llu pinned %llu reserved\n", | |
4952 | (unsigned long long)cache->key.objectid, | |
4953 | (unsigned long long)cache->key.offset, | |
4954 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
4955 | (unsigned long long)cache->pinned, | |
4956 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
4957 | btrfs_dump_free_space(cache, bytes); |
4958 | spin_unlock(&cache->lock); | |
4959 | } | |
b742bb82 YZ |
4960 | if (++index < BTRFS_NR_RAID_TYPES) |
4961 | goto again; | |
80eb234a | 4962 | up_read(&info->groups_sem); |
0f9dd46c | 4963 | } |
e8569813 | 4964 | |
11833d66 YZ |
4965 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
4966 | struct btrfs_root *root, | |
4967 | u64 num_bytes, u64 min_alloc_size, | |
4968 | u64 empty_size, u64 hint_byte, | |
4969 | u64 search_end, struct btrfs_key *ins, | |
4970 | u64 data) | |
fec577fb CM |
4971 | { |
4972 | int ret; | |
fbdc762b | 4973 | u64 search_start = 0; |
925baedd | 4974 | |
6a63209f | 4975 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 4976 | again: |
0ef3e66b CM |
4977 | /* |
4978 | * the only place that sets empty_size is btrfs_realloc_node, which | |
4979 | * is not called recursively on allocations | |
4980 | */ | |
83d3c969 | 4981 | if (empty_size || root->ref_cows) |
6324fbf3 | 4982 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b | 4983 | num_bytes + 2 * 1024 * 1024, data, 0); |
0b86a832 | 4984 | |
db94535d CM |
4985 | WARN_ON(num_bytes < root->sectorsize); |
4986 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
f0486c68 YZ |
4987 | search_start, search_end, hint_byte, |
4988 | ins, data); | |
3b951516 | 4989 | |
98d20f67 CM |
4990 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
4991 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 4992 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 4993 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
4994 | do_chunk_alloc(trans, root->fs_info->extent_root, |
4995 | num_bytes, data, 1); | |
98d20f67 CM |
4996 | goto again; |
4997 | } | |
817d52f8 | 4998 | if (ret == -ENOSPC) { |
0f9dd46c JB |
4999 | struct btrfs_space_info *sinfo; |
5000 | ||
5001 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
5002 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
5003 | "wanted %llu\n", (unsigned long long)data, | |
5004 | (unsigned long long)num_bytes); | |
9ed74f2d | 5005 | dump_space_info(sinfo, num_bytes, 1); |
925baedd | 5006 | } |
0f9dd46c JB |
5007 | |
5008 | return ret; | |
e6dcd2dc CM |
5009 | } |
5010 | ||
65b51a00 CM |
5011 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
5012 | { | |
0f9dd46c | 5013 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 5014 | int ret = 0; |
0f9dd46c | 5015 | |
0f9dd46c JB |
5016 | cache = btrfs_lookup_block_group(root->fs_info, start); |
5017 | if (!cache) { | |
d397712b CM |
5018 | printk(KERN_ERR "Unable to find block group for %llu\n", |
5019 | (unsigned long long)start); | |
0f9dd46c JB |
5020 | return -ENOSPC; |
5021 | } | |
1f3c79a2 LH |
5022 | |
5023 | ret = btrfs_discard_extent(root, start, len); | |
5024 | ||
0f9dd46c | 5025 | btrfs_add_free_space(cache, start, len); |
f0486c68 | 5026 | update_reserved_bytes(cache, len, 0, 1); |
fa9c0d79 | 5027 | btrfs_put_block_group(cache); |
817d52f8 | 5028 | |
e6dcd2dc CM |
5029 | return ret; |
5030 | } | |
5031 | ||
5d4f98a2 YZ |
5032 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
5033 | struct btrfs_root *root, | |
5034 | u64 parent, u64 root_objectid, | |
5035 | u64 flags, u64 owner, u64 offset, | |
5036 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
5037 | { |
5038 | int ret; | |
5d4f98a2 | 5039 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 5040 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 5041 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 5042 | struct btrfs_path *path; |
5d4f98a2 YZ |
5043 | struct extent_buffer *leaf; |
5044 | int type; | |
5045 | u32 size; | |
26b8003f | 5046 | |
5d4f98a2 YZ |
5047 | if (parent > 0) |
5048 | type = BTRFS_SHARED_DATA_REF_KEY; | |
5049 | else | |
5050 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 5051 | |
5d4f98a2 | 5052 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
5053 | |
5054 | path = btrfs_alloc_path(); | |
5055 | BUG_ON(!path); | |
47e4bb98 | 5056 | |
b9473439 | 5057 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5058 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
5059 | ins, size); | |
ccd467d6 | 5060 | BUG_ON(ret); |
0f9dd46c | 5061 | |
5d4f98a2 YZ |
5062 | leaf = path->nodes[0]; |
5063 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 5064 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5065 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
5066 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5067 | btrfs_set_extent_flags(leaf, extent_item, | |
5068 | flags | BTRFS_EXTENT_FLAG_DATA); | |
5069 | ||
5070 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
5071 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
5072 | if (parent > 0) { | |
5073 | struct btrfs_shared_data_ref *ref; | |
5074 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
5075 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5076 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
5077 | } else { | |
5078 | struct btrfs_extent_data_ref *ref; | |
5079 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
5080 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
5081 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
5082 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
5083 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
5084 | } | |
47e4bb98 CM |
5085 | |
5086 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 5087 | btrfs_free_path(path); |
f510cfec | 5088 | |
f0486c68 | 5089 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
f5947066 | 5090 | if (ret) { |
d397712b CM |
5091 | printk(KERN_ERR "btrfs update block group failed for %llu " |
5092 | "%llu\n", (unsigned long long)ins->objectid, | |
5093 | (unsigned long long)ins->offset); | |
f5947066 CM |
5094 | BUG(); |
5095 | } | |
e6dcd2dc CM |
5096 | return ret; |
5097 | } | |
5098 | ||
5d4f98a2 YZ |
5099 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
5100 | struct btrfs_root *root, | |
5101 | u64 parent, u64 root_objectid, | |
5102 | u64 flags, struct btrfs_disk_key *key, | |
5103 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
5104 | { |
5105 | int ret; | |
5d4f98a2 YZ |
5106 | struct btrfs_fs_info *fs_info = root->fs_info; |
5107 | struct btrfs_extent_item *extent_item; | |
5108 | struct btrfs_tree_block_info *block_info; | |
5109 | struct btrfs_extent_inline_ref *iref; | |
5110 | struct btrfs_path *path; | |
5111 | struct extent_buffer *leaf; | |
5112 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 5113 | |
5d4f98a2 YZ |
5114 | path = btrfs_alloc_path(); |
5115 | BUG_ON(!path); | |
56bec294 | 5116 | |
5d4f98a2 YZ |
5117 | path->leave_spinning = 1; |
5118 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
5119 | ins, size); | |
56bec294 | 5120 | BUG_ON(ret); |
5d4f98a2 YZ |
5121 | |
5122 | leaf = path->nodes[0]; | |
5123 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
5124 | struct btrfs_extent_item); | |
5125 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
5126 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5127 | btrfs_set_extent_flags(leaf, extent_item, | |
5128 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5129 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
5130 | ||
5131 | btrfs_set_tree_block_key(leaf, block_info, key); | |
5132 | btrfs_set_tree_block_level(leaf, block_info, level); | |
5133 | ||
5134 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
5135 | if (parent > 0) { | |
5136 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
5137 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5138 | BTRFS_SHARED_BLOCK_REF_KEY); | |
5139 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5140 | } else { | |
5141 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5142 | BTRFS_TREE_BLOCK_REF_KEY); | |
5143 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
5144 | } | |
5145 | ||
5146 | btrfs_mark_buffer_dirty(leaf); | |
5147 | btrfs_free_path(path); | |
5148 | ||
f0486c68 | 5149 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
5d4f98a2 YZ |
5150 | if (ret) { |
5151 | printk(KERN_ERR "btrfs update block group failed for %llu " | |
5152 | "%llu\n", (unsigned long long)ins->objectid, | |
5153 | (unsigned long long)ins->offset); | |
5154 | BUG(); | |
5155 | } | |
5156 | return ret; | |
5157 | } | |
5158 | ||
5159 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
5160 | struct btrfs_root *root, | |
5161 | u64 root_objectid, u64 owner, | |
5162 | u64 offset, struct btrfs_key *ins) | |
5163 | { | |
5164 | int ret; | |
5165 | ||
5166 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
5167 | ||
5168 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, | |
5169 | 0, root_objectid, owner, offset, | |
5170 | BTRFS_ADD_DELAYED_EXTENT, NULL); | |
e6dcd2dc CM |
5171 | return ret; |
5172 | } | |
e02119d5 CM |
5173 | |
5174 | /* | |
5175 | * this is used by the tree logging recovery code. It records that | |
5176 | * an extent has been allocated and makes sure to clear the free | |
5177 | * space cache bits as well | |
5178 | */ | |
5d4f98a2 YZ |
5179 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
5180 | struct btrfs_root *root, | |
5181 | u64 root_objectid, u64 owner, u64 offset, | |
5182 | struct btrfs_key *ins) | |
e02119d5 CM |
5183 | { |
5184 | int ret; | |
5185 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
5186 | struct btrfs_caching_control *caching_ctl; |
5187 | u64 start = ins->objectid; | |
5188 | u64 num_bytes = ins->offset; | |
e02119d5 | 5189 | |
e02119d5 | 5190 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
817d52f8 | 5191 | cache_block_group(block_group); |
11833d66 | 5192 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 5193 | |
11833d66 YZ |
5194 | if (!caching_ctl) { |
5195 | BUG_ON(!block_group_cache_done(block_group)); | |
5196 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5197 | BUG_ON(ret); | |
5198 | } else { | |
5199 | mutex_lock(&caching_ctl->mutex); | |
5200 | ||
5201 | if (start >= caching_ctl->progress) { | |
5202 | ret = add_excluded_extent(root, start, num_bytes); | |
5203 | BUG_ON(ret); | |
5204 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5205 | ret = btrfs_remove_free_space(block_group, | |
5206 | start, num_bytes); | |
5207 | BUG_ON(ret); | |
5208 | } else { | |
5209 | num_bytes = caching_ctl->progress - start; | |
5210 | ret = btrfs_remove_free_space(block_group, | |
5211 | start, num_bytes); | |
5212 | BUG_ON(ret); | |
5213 | ||
5214 | start = caching_ctl->progress; | |
5215 | num_bytes = ins->objectid + ins->offset - | |
5216 | caching_ctl->progress; | |
5217 | ret = add_excluded_extent(root, start, num_bytes); | |
5218 | BUG_ON(ret); | |
5219 | } | |
5220 | ||
5221 | mutex_unlock(&caching_ctl->mutex); | |
5222 | put_caching_control(caching_ctl); | |
5223 | } | |
5224 | ||
f0486c68 YZ |
5225 | ret = update_reserved_bytes(block_group, ins->offset, 1, 1); |
5226 | BUG_ON(ret); | |
fa9c0d79 | 5227 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
5228 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
5229 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
5230 | return ret; |
5231 | } | |
5232 | ||
65b51a00 CM |
5233 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
5234 | struct btrfs_root *root, | |
4008c04a CM |
5235 | u64 bytenr, u32 blocksize, |
5236 | int level) | |
65b51a00 CM |
5237 | { |
5238 | struct extent_buffer *buf; | |
5239 | ||
5240 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
5241 | if (!buf) | |
5242 | return ERR_PTR(-ENOMEM); | |
5243 | btrfs_set_header_generation(buf, trans->transid); | |
4008c04a | 5244 | btrfs_set_buffer_lockdep_class(buf, level); |
65b51a00 CM |
5245 | btrfs_tree_lock(buf); |
5246 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
5247 | |
5248 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 5249 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 5250 | |
d0c803c4 | 5251 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
5252 | /* |
5253 | * we allow two log transactions at a time, use different | |
5254 | * EXENT bit to differentiate dirty pages. | |
5255 | */ | |
5256 | if (root->log_transid % 2 == 0) | |
5257 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
5258 | buf->start + buf->len - 1, GFP_NOFS); | |
5259 | else | |
5260 | set_extent_new(&root->dirty_log_pages, buf->start, | |
5261 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
5262 | } else { |
5263 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 5264 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 5265 | } |
65b51a00 | 5266 | trans->blocks_used++; |
b4ce94de | 5267 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
5268 | return buf; |
5269 | } | |
5270 | ||
f0486c68 YZ |
5271 | static struct btrfs_block_rsv * |
5272 | use_block_rsv(struct btrfs_trans_handle *trans, | |
5273 | struct btrfs_root *root, u32 blocksize) | |
5274 | { | |
5275 | struct btrfs_block_rsv *block_rsv; | |
5276 | int ret; | |
5277 | ||
5278 | block_rsv = get_block_rsv(trans, root); | |
5279 | ||
5280 | if (block_rsv->size == 0) { | |
5281 | ret = reserve_metadata_bytes(block_rsv, blocksize); | |
5282 | if (ret) | |
5283 | return ERR_PTR(ret); | |
5284 | return block_rsv; | |
5285 | } | |
5286 | ||
5287 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
5288 | if (!ret) | |
5289 | return block_rsv; | |
5290 | ||
5291 | WARN_ON(1); | |
5292 | printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n", | |
5293 | block_rsv->size, block_rsv->reserved, | |
5294 | block_rsv->freed[0], block_rsv->freed[1]); | |
5295 | ||
5296 | return ERR_PTR(-ENOSPC); | |
5297 | } | |
5298 | ||
5299 | static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
5300 | { | |
5301 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
5302 | block_rsv_release_bytes(block_rsv, NULL, 0); | |
5303 | } | |
5304 | ||
fec577fb | 5305 | /* |
f0486c68 YZ |
5306 | * finds a free extent and does all the dirty work required for allocation |
5307 | * returns the key for the extent through ins, and a tree buffer for | |
5308 | * the first block of the extent through buf. | |
5309 | * | |
fec577fb CM |
5310 | * returns the tree buffer or NULL. |
5311 | */ | |
5f39d397 | 5312 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
5313 | struct btrfs_root *root, u32 blocksize, |
5314 | u64 parent, u64 root_objectid, | |
5315 | struct btrfs_disk_key *key, int level, | |
5316 | u64 hint, u64 empty_size) | |
fec577fb | 5317 | { |
e2fa7227 | 5318 | struct btrfs_key ins; |
f0486c68 | 5319 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 5320 | struct extent_buffer *buf; |
f0486c68 YZ |
5321 | u64 flags = 0; |
5322 | int ret; | |
5323 | ||
fec577fb | 5324 | |
f0486c68 YZ |
5325 | block_rsv = use_block_rsv(trans, root, blocksize); |
5326 | if (IS_ERR(block_rsv)) | |
5327 | return ERR_CAST(block_rsv); | |
5328 | ||
5329 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
5330 | empty_size, hint, (u64)-1, &ins, 0); | |
fec577fb | 5331 | if (ret) { |
f0486c68 | 5332 | unuse_block_rsv(block_rsv, blocksize); |
54aa1f4d | 5333 | return ERR_PTR(ret); |
fec577fb | 5334 | } |
55c69072 | 5335 | |
4008c04a CM |
5336 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
5337 | blocksize, level); | |
f0486c68 YZ |
5338 | BUG_ON(IS_ERR(buf)); |
5339 | ||
5340 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
5341 | if (parent == 0) | |
5342 | parent = ins.objectid; | |
5343 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
5344 | } else | |
5345 | BUG_ON(parent > 0); | |
5346 | ||
5347 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5348 | struct btrfs_delayed_extent_op *extent_op; | |
5349 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
5350 | BUG_ON(!extent_op); | |
5351 | if (key) | |
5352 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
5353 | else | |
5354 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
5355 | extent_op->flags_to_set = flags; | |
5356 | extent_op->update_key = 1; | |
5357 | extent_op->update_flags = 1; | |
5358 | extent_op->is_data = 0; | |
5359 | ||
5360 | ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, | |
5361 | ins.offset, parent, root_objectid, | |
5362 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5363 | extent_op); | |
5364 | BUG_ON(ret); | |
5365 | } | |
fec577fb CM |
5366 | return buf; |
5367 | } | |
a28ec197 | 5368 | |
2c47e605 YZ |
5369 | struct walk_control { |
5370 | u64 refs[BTRFS_MAX_LEVEL]; | |
5371 | u64 flags[BTRFS_MAX_LEVEL]; | |
5372 | struct btrfs_key update_progress; | |
5373 | int stage; | |
5374 | int level; | |
5375 | int shared_level; | |
5376 | int update_ref; | |
5377 | int keep_locks; | |
1c4850e2 YZ |
5378 | int reada_slot; |
5379 | int reada_count; | |
2c47e605 YZ |
5380 | }; |
5381 | ||
5382 | #define DROP_REFERENCE 1 | |
5383 | #define UPDATE_BACKREF 2 | |
5384 | ||
1c4850e2 YZ |
5385 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
5386 | struct btrfs_root *root, | |
5387 | struct walk_control *wc, | |
5388 | struct btrfs_path *path) | |
6407bf6d | 5389 | { |
1c4850e2 YZ |
5390 | u64 bytenr; |
5391 | u64 generation; | |
5392 | u64 refs; | |
94fcca9f | 5393 | u64 flags; |
1c4850e2 | 5394 | u64 last = 0; |
5d4f98a2 | 5395 | u32 nritems; |
1c4850e2 YZ |
5396 | u32 blocksize; |
5397 | struct btrfs_key key; | |
5398 | struct extent_buffer *eb; | |
6407bf6d | 5399 | int ret; |
1c4850e2 YZ |
5400 | int slot; |
5401 | int nread = 0; | |
6407bf6d | 5402 | |
1c4850e2 YZ |
5403 | if (path->slots[wc->level] < wc->reada_slot) { |
5404 | wc->reada_count = wc->reada_count * 2 / 3; | |
5405 | wc->reada_count = max(wc->reada_count, 2); | |
5406 | } else { | |
5407 | wc->reada_count = wc->reada_count * 3 / 2; | |
5408 | wc->reada_count = min_t(int, wc->reada_count, | |
5409 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
5410 | } | |
7bb86316 | 5411 | |
1c4850e2 YZ |
5412 | eb = path->nodes[wc->level]; |
5413 | nritems = btrfs_header_nritems(eb); | |
5414 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 5415 | |
1c4850e2 YZ |
5416 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
5417 | if (nread >= wc->reada_count) | |
5418 | break; | |
bd56b302 | 5419 | |
2dd3e67b | 5420 | cond_resched(); |
1c4850e2 YZ |
5421 | bytenr = btrfs_node_blockptr(eb, slot); |
5422 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 5423 | |
1c4850e2 YZ |
5424 | if (slot == path->slots[wc->level]) |
5425 | goto reada; | |
5d4f98a2 | 5426 | |
1c4850e2 YZ |
5427 | if (wc->stage == UPDATE_BACKREF && |
5428 | generation <= root->root_key.offset) | |
bd56b302 CM |
5429 | continue; |
5430 | ||
94fcca9f YZ |
5431 | /* We don't lock the tree block, it's OK to be racy here */ |
5432 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
5433 | &refs, &flags); | |
5434 | BUG_ON(ret); | |
5435 | BUG_ON(refs == 0); | |
5436 | ||
1c4850e2 | 5437 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
5438 | if (refs == 1) |
5439 | goto reada; | |
bd56b302 | 5440 | |
94fcca9f YZ |
5441 | if (wc->level == 1 && |
5442 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5443 | continue; | |
1c4850e2 YZ |
5444 | if (!wc->update_ref || |
5445 | generation <= root->root_key.offset) | |
5446 | continue; | |
5447 | btrfs_node_key_to_cpu(eb, &key, slot); | |
5448 | ret = btrfs_comp_cpu_keys(&key, | |
5449 | &wc->update_progress); | |
5450 | if (ret < 0) | |
5451 | continue; | |
94fcca9f YZ |
5452 | } else { |
5453 | if (wc->level == 1 && | |
5454 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5455 | continue; | |
6407bf6d | 5456 | } |
1c4850e2 YZ |
5457 | reada: |
5458 | ret = readahead_tree_block(root, bytenr, blocksize, | |
5459 | generation); | |
5460 | if (ret) | |
bd56b302 | 5461 | break; |
1c4850e2 YZ |
5462 | last = bytenr + blocksize; |
5463 | nread++; | |
20524f02 | 5464 | } |
1c4850e2 | 5465 | wc->reada_slot = slot; |
20524f02 | 5466 | } |
2c47e605 | 5467 | |
f82d02d9 | 5468 | /* |
2c47e605 YZ |
5469 | * hepler to process tree block while walking down the tree. |
5470 | * | |
2c47e605 YZ |
5471 | * when wc->stage == UPDATE_BACKREF, this function updates |
5472 | * back refs for pointers in the block. | |
5473 | * | |
5474 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 5475 | */ |
2c47e605 | 5476 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 5477 | struct btrfs_root *root, |
2c47e605 | 5478 | struct btrfs_path *path, |
94fcca9f | 5479 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 5480 | { |
2c47e605 YZ |
5481 | int level = wc->level; |
5482 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 5483 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
5484 | int ret; |
5485 | ||
2c47e605 YZ |
5486 | if (wc->stage == UPDATE_BACKREF && |
5487 | btrfs_header_owner(eb) != root->root_key.objectid) | |
5488 | return 1; | |
f82d02d9 | 5489 | |
2c47e605 YZ |
5490 | /* |
5491 | * when reference count of tree block is 1, it won't increase | |
5492 | * again. once full backref flag is set, we never clear it. | |
5493 | */ | |
94fcca9f YZ |
5494 | if (lookup_info && |
5495 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
5496 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
5497 | BUG_ON(!path->locks[level]); |
5498 | ret = btrfs_lookup_extent_info(trans, root, | |
5499 | eb->start, eb->len, | |
5500 | &wc->refs[level], | |
5501 | &wc->flags[level]); | |
5502 | BUG_ON(ret); | |
5503 | BUG_ON(wc->refs[level] == 0); | |
5504 | } | |
5d4f98a2 | 5505 | |
2c47e605 YZ |
5506 | if (wc->stage == DROP_REFERENCE) { |
5507 | if (wc->refs[level] > 1) | |
5508 | return 1; | |
f82d02d9 | 5509 | |
2c47e605 YZ |
5510 | if (path->locks[level] && !wc->keep_locks) { |
5511 | btrfs_tree_unlock(eb); | |
5512 | path->locks[level] = 0; | |
5513 | } | |
5514 | return 0; | |
5515 | } | |
f82d02d9 | 5516 | |
2c47e605 YZ |
5517 | /* wc->stage == UPDATE_BACKREF */ |
5518 | if (!(wc->flags[level] & flag)) { | |
5519 | BUG_ON(!path->locks[level]); | |
5520 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
f82d02d9 | 5521 | BUG_ON(ret); |
2c47e605 YZ |
5522 | ret = btrfs_dec_ref(trans, root, eb, 0); |
5523 | BUG_ON(ret); | |
5524 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
5525 | eb->len, flag, 0); | |
5526 | BUG_ON(ret); | |
5527 | wc->flags[level] |= flag; | |
5528 | } | |
5529 | ||
5530 | /* | |
5531 | * the block is shared by multiple trees, so it's not good to | |
5532 | * keep the tree lock | |
5533 | */ | |
5534 | if (path->locks[level] && level > 0) { | |
5535 | btrfs_tree_unlock(eb); | |
5536 | path->locks[level] = 0; | |
5537 | } | |
5538 | return 0; | |
5539 | } | |
5540 | ||
1c4850e2 YZ |
5541 | /* |
5542 | * hepler to process tree block pointer. | |
5543 | * | |
5544 | * when wc->stage == DROP_REFERENCE, this function checks | |
5545 | * reference count of the block pointed to. if the block | |
5546 | * is shared and we need update back refs for the subtree | |
5547 | * rooted at the block, this function changes wc->stage to | |
5548 | * UPDATE_BACKREF. if the block is shared and there is no | |
5549 | * need to update back, this function drops the reference | |
5550 | * to the block. | |
5551 | * | |
5552 | * NOTE: return value 1 means we should stop walking down. | |
5553 | */ | |
5554 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
5555 | struct btrfs_root *root, | |
5556 | struct btrfs_path *path, | |
94fcca9f | 5557 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
5558 | { |
5559 | u64 bytenr; | |
5560 | u64 generation; | |
5561 | u64 parent; | |
5562 | u32 blocksize; | |
5563 | struct btrfs_key key; | |
5564 | struct extent_buffer *next; | |
5565 | int level = wc->level; | |
5566 | int reada = 0; | |
5567 | int ret = 0; | |
5568 | ||
5569 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
5570 | path->slots[level]); | |
5571 | /* | |
5572 | * if the lower level block was created before the snapshot | |
5573 | * was created, we know there is no need to update back refs | |
5574 | * for the subtree | |
5575 | */ | |
5576 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
5577 | generation <= root->root_key.offset) { |
5578 | *lookup_info = 1; | |
1c4850e2 | 5579 | return 1; |
94fcca9f | 5580 | } |
1c4850e2 YZ |
5581 | |
5582 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
5583 | blocksize = btrfs_level_size(root, level - 1); | |
5584 | ||
5585 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
5586 | if (!next) { | |
5587 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
5588 | if (!next) |
5589 | return -ENOMEM; | |
1c4850e2 YZ |
5590 | reada = 1; |
5591 | } | |
5592 | btrfs_tree_lock(next); | |
5593 | btrfs_set_lock_blocking(next); | |
5594 | ||
94fcca9f YZ |
5595 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
5596 | &wc->refs[level - 1], | |
5597 | &wc->flags[level - 1]); | |
5598 | BUG_ON(ret); | |
5599 | BUG_ON(wc->refs[level - 1] == 0); | |
5600 | *lookup_info = 0; | |
1c4850e2 | 5601 | |
94fcca9f | 5602 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 5603 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
5604 | if (level == 1 && |
5605 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5606 | goto skip; | |
5607 | ||
1c4850e2 YZ |
5608 | if (!wc->update_ref || |
5609 | generation <= root->root_key.offset) | |
5610 | goto skip; | |
5611 | ||
5612 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
5613 | path->slots[level]); | |
5614 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
5615 | if (ret < 0) | |
5616 | goto skip; | |
5617 | ||
5618 | wc->stage = UPDATE_BACKREF; | |
5619 | wc->shared_level = level - 1; | |
5620 | } | |
94fcca9f YZ |
5621 | } else { |
5622 | if (level == 1 && | |
5623 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5624 | goto skip; | |
1c4850e2 YZ |
5625 | } |
5626 | ||
5627 | if (!btrfs_buffer_uptodate(next, generation)) { | |
5628 | btrfs_tree_unlock(next); | |
5629 | free_extent_buffer(next); | |
5630 | next = NULL; | |
94fcca9f | 5631 | *lookup_info = 1; |
1c4850e2 YZ |
5632 | } |
5633 | ||
5634 | if (!next) { | |
5635 | if (reada && level == 1) | |
5636 | reada_walk_down(trans, root, wc, path); | |
5637 | next = read_tree_block(root, bytenr, blocksize, generation); | |
5638 | btrfs_tree_lock(next); | |
5639 | btrfs_set_lock_blocking(next); | |
5640 | } | |
5641 | ||
5642 | level--; | |
5643 | BUG_ON(level != btrfs_header_level(next)); | |
5644 | path->nodes[level] = next; | |
5645 | path->slots[level] = 0; | |
5646 | path->locks[level] = 1; | |
5647 | wc->level = level; | |
5648 | if (wc->level == 1) | |
5649 | wc->reada_slot = 0; | |
5650 | return 0; | |
5651 | skip: | |
5652 | wc->refs[level - 1] = 0; | |
5653 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
5654 | if (wc->stage == DROP_REFERENCE) { |
5655 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
5656 | parent = path->nodes[level]->start; | |
5657 | } else { | |
5658 | BUG_ON(root->root_key.objectid != | |
5659 | btrfs_header_owner(path->nodes[level])); | |
5660 | parent = 0; | |
5661 | } | |
1c4850e2 | 5662 | |
94fcca9f YZ |
5663 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
5664 | root->root_key.objectid, level - 1, 0); | |
5665 | BUG_ON(ret); | |
1c4850e2 | 5666 | } |
1c4850e2 YZ |
5667 | btrfs_tree_unlock(next); |
5668 | free_extent_buffer(next); | |
94fcca9f | 5669 | *lookup_info = 1; |
1c4850e2 YZ |
5670 | return 1; |
5671 | } | |
5672 | ||
2c47e605 YZ |
5673 | /* |
5674 | * hepler to process tree block while walking up the tree. | |
5675 | * | |
5676 | * when wc->stage == DROP_REFERENCE, this function drops | |
5677 | * reference count on the block. | |
5678 | * | |
5679 | * when wc->stage == UPDATE_BACKREF, this function changes | |
5680 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
5681 | * to UPDATE_BACKREF previously while processing the block. | |
5682 | * | |
5683 | * NOTE: return value 1 means we should stop walking up. | |
5684 | */ | |
5685 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
5686 | struct btrfs_root *root, | |
5687 | struct btrfs_path *path, | |
5688 | struct walk_control *wc) | |
5689 | { | |
f0486c68 | 5690 | int ret; |
2c47e605 YZ |
5691 | int level = wc->level; |
5692 | struct extent_buffer *eb = path->nodes[level]; | |
5693 | u64 parent = 0; | |
5694 | ||
5695 | if (wc->stage == UPDATE_BACKREF) { | |
5696 | BUG_ON(wc->shared_level < level); | |
5697 | if (level < wc->shared_level) | |
5698 | goto out; | |
5699 | ||
2c47e605 YZ |
5700 | ret = find_next_key(path, level + 1, &wc->update_progress); |
5701 | if (ret > 0) | |
5702 | wc->update_ref = 0; | |
5703 | ||
5704 | wc->stage = DROP_REFERENCE; | |
5705 | wc->shared_level = -1; | |
5706 | path->slots[level] = 0; | |
5707 | ||
5708 | /* | |
5709 | * check reference count again if the block isn't locked. | |
5710 | * we should start walking down the tree again if reference | |
5711 | * count is one. | |
5712 | */ | |
5713 | if (!path->locks[level]) { | |
5714 | BUG_ON(level == 0); | |
5715 | btrfs_tree_lock(eb); | |
5716 | btrfs_set_lock_blocking(eb); | |
5717 | path->locks[level] = 1; | |
5718 | ||
5719 | ret = btrfs_lookup_extent_info(trans, root, | |
5720 | eb->start, eb->len, | |
5721 | &wc->refs[level], | |
5722 | &wc->flags[level]); | |
f82d02d9 | 5723 | BUG_ON(ret); |
2c47e605 YZ |
5724 | BUG_ON(wc->refs[level] == 0); |
5725 | if (wc->refs[level] == 1) { | |
5726 | btrfs_tree_unlock(eb); | |
5727 | path->locks[level] = 0; | |
5728 | return 1; | |
5729 | } | |
f82d02d9 | 5730 | } |
2c47e605 | 5731 | } |
f82d02d9 | 5732 | |
2c47e605 YZ |
5733 | /* wc->stage == DROP_REFERENCE */ |
5734 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 5735 | |
2c47e605 YZ |
5736 | if (wc->refs[level] == 1) { |
5737 | if (level == 0) { | |
5738 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
5739 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
5740 | else | |
5741 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
5742 | BUG_ON(ret); | |
5743 | } | |
5744 | /* make block locked assertion in clean_tree_block happy */ | |
5745 | if (!path->locks[level] && | |
5746 | btrfs_header_generation(eb) == trans->transid) { | |
5747 | btrfs_tree_lock(eb); | |
5748 | btrfs_set_lock_blocking(eb); | |
5749 | path->locks[level] = 1; | |
5750 | } | |
5751 | clean_tree_block(trans, root, eb); | |
5752 | } | |
5753 | ||
5754 | if (eb == root->node) { | |
5755 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
5756 | parent = eb->start; | |
5757 | else | |
5758 | BUG_ON(root->root_key.objectid != | |
5759 | btrfs_header_owner(eb)); | |
5760 | } else { | |
5761 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
5762 | parent = path->nodes[level + 1]->start; | |
5763 | else | |
5764 | BUG_ON(root->root_key.objectid != | |
5765 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 5766 | } |
f82d02d9 | 5767 | |
f0486c68 | 5768 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
5769 | out: |
5770 | wc->refs[level] = 0; | |
5771 | wc->flags[level] = 0; | |
f0486c68 | 5772 | return 0; |
2c47e605 YZ |
5773 | } |
5774 | ||
5775 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
5776 | struct btrfs_root *root, | |
5777 | struct btrfs_path *path, | |
5778 | struct walk_control *wc) | |
5779 | { | |
2c47e605 | 5780 | int level = wc->level; |
94fcca9f | 5781 | int lookup_info = 1; |
2c47e605 YZ |
5782 | int ret; |
5783 | ||
5784 | while (level >= 0) { | |
94fcca9f | 5785 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
5786 | if (ret > 0) |
5787 | break; | |
5788 | ||
5789 | if (level == 0) | |
5790 | break; | |
5791 | ||
7a7965f8 YZ |
5792 | if (path->slots[level] >= |
5793 | btrfs_header_nritems(path->nodes[level])) | |
5794 | break; | |
5795 | ||
94fcca9f | 5796 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
5797 | if (ret > 0) { |
5798 | path->slots[level]++; | |
5799 | continue; | |
90d2c51d MX |
5800 | } else if (ret < 0) |
5801 | return ret; | |
1c4850e2 | 5802 | level = wc->level; |
f82d02d9 | 5803 | } |
f82d02d9 YZ |
5804 | return 0; |
5805 | } | |
5806 | ||
d397712b | 5807 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 5808 | struct btrfs_root *root, |
f82d02d9 | 5809 | struct btrfs_path *path, |
2c47e605 | 5810 | struct walk_control *wc, int max_level) |
20524f02 | 5811 | { |
2c47e605 | 5812 | int level = wc->level; |
20524f02 | 5813 | int ret; |
9f3a7427 | 5814 | |
2c47e605 YZ |
5815 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
5816 | while (level < max_level && path->nodes[level]) { | |
5817 | wc->level = level; | |
5818 | if (path->slots[level] + 1 < | |
5819 | btrfs_header_nritems(path->nodes[level])) { | |
5820 | path->slots[level]++; | |
20524f02 CM |
5821 | return 0; |
5822 | } else { | |
2c47e605 YZ |
5823 | ret = walk_up_proc(trans, root, path, wc); |
5824 | if (ret > 0) | |
5825 | return 0; | |
bd56b302 | 5826 | |
2c47e605 YZ |
5827 | if (path->locks[level]) { |
5828 | btrfs_tree_unlock(path->nodes[level]); | |
5829 | path->locks[level] = 0; | |
f82d02d9 | 5830 | } |
2c47e605 YZ |
5831 | free_extent_buffer(path->nodes[level]); |
5832 | path->nodes[level] = NULL; | |
5833 | level++; | |
20524f02 CM |
5834 | } |
5835 | } | |
5836 | return 1; | |
5837 | } | |
5838 | ||
9aca1d51 | 5839 | /* |
2c47e605 YZ |
5840 | * drop a subvolume tree. |
5841 | * | |
5842 | * this function traverses the tree freeing any blocks that only | |
5843 | * referenced by the tree. | |
5844 | * | |
5845 | * when a shared tree block is found. this function decreases its | |
5846 | * reference count by one. if update_ref is true, this function | |
5847 | * also make sure backrefs for the shared block and all lower level | |
5848 | * blocks are properly updated. | |
9aca1d51 | 5849 | */ |
2c47e605 | 5850 | int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref) |
20524f02 | 5851 | { |
5caf2a00 | 5852 | struct btrfs_path *path; |
2c47e605 YZ |
5853 | struct btrfs_trans_handle *trans; |
5854 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 5855 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
5856 | struct walk_control *wc; |
5857 | struct btrfs_key key; | |
5858 | int err = 0; | |
5859 | int ret; | |
5860 | int level; | |
20524f02 | 5861 | |
5caf2a00 CM |
5862 | path = btrfs_alloc_path(); |
5863 | BUG_ON(!path); | |
20524f02 | 5864 | |
2c47e605 YZ |
5865 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
5866 | BUG_ON(!wc); | |
5867 | ||
a22285a6 | 5868 | trans = btrfs_start_transaction(tree_root, 0); |
2c47e605 | 5869 | |
9f3a7427 | 5870 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 5871 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
5872 | path->nodes[level] = btrfs_lock_root_node(root); |
5873 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 5874 | path->slots[level] = 0; |
5d4f98a2 | 5875 | path->locks[level] = 1; |
2c47e605 YZ |
5876 | memset(&wc->update_progress, 0, |
5877 | sizeof(wc->update_progress)); | |
9f3a7427 | 5878 | } else { |
9f3a7427 | 5879 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
5880 | memcpy(&wc->update_progress, &key, |
5881 | sizeof(wc->update_progress)); | |
5882 | ||
6702ed49 | 5883 | level = root_item->drop_level; |
2c47e605 | 5884 | BUG_ON(level == 0); |
6702ed49 | 5885 | path->lowest_level = level; |
2c47e605 YZ |
5886 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5887 | path->lowest_level = 0; | |
5888 | if (ret < 0) { | |
5889 | err = ret; | |
9f3a7427 CM |
5890 | goto out; |
5891 | } | |
1c4850e2 | 5892 | WARN_ON(ret > 0); |
2c47e605 | 5893 | |
7d9eb12c CM |
5894 | /* |
5895 | * unlock our path, this is safe because only this | |
5896 | * function is allowed to delete this snapshot | |
5897 | */ | |
5d4f98a2 | 5898 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
5899 | |
5900 | level = btrfs_header_level(root->node); | |
5901 | while (1) { | |
5902 | btrfs_tree_lock(path->nodes[level]); | |
5903 | btrfs_set_lock_blocking(path->nodes[level]); | |
5904 | ||
5905 | ret = btrfs_lookup_extent_info(trans, root, | |
5906 | path->nodes[level]->start, | |
5907 | path->nodes[level]->len, | |
5908 | &wc->refs[level], | |
5909 | &wc->flags[level]); | |
5910 | BUG_ON(ret); | |
5911 | BUG_ON(wc->refs[level] == 0); | |
5912 | ||
5913 | if (level == root_item->drop_level) | |
5914 | break; | |
5915 | ||
5916 | btrfs_tree_unlock(path->nodes[level]); | |
5917 | WARN_ON(wc->refs[level] != 1); | |
5918 | level--; | |
5919 | } | |
9f3a7427 | 5920 | } |
2c47e605 YZ |
5921 | |
5922 | wc->level = level; | |
5923 | wc->shared_level = -1; | |
5924 | wc->stage = DROP_REFERENCE; | |
5925 | wc->update_ref = update_ref; | |
5926 | wc->keep_locks = 0; | |
1c4850e2 | 5927 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 5928 | |
d397712b | 5929 | while (1) { |
2c47e605 YZ |
5930 | ret = walk_down_tree(trans, root, path, wc); |
5931 | if (ret < 0) { | |
5932 | err = ret; | |
20524f02 | 5933 | break; |
2c47e605 | 5934 | } |
9aca1d51 | 5935 | |
2c47e605 YZ |
5936 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
5937 | if (ret < 0) { | |
5938 | err = ret; | |
20524f02 | 5939 | break; |
2c47e605 YZ |
5940 | } |
5941 | ||
5942 | if (ret > 0) { | |
5943 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
5944 | break; |
5945 | } | |
2c47e605 YZ |
5946 | |
5947 | if (wc->stage == DROP_REFERENCE) { | |
5948 | level = wc->level; | |
5949 | btrfs_node_key(path->nodes[level], | |
5950 | &root_item->drop_progress, | |
5951 | path->slots[level]); | |
5952 | root_item->drop_level = level; | |
5953 | } | |
5954 | ||
5955 | BUG_ON(wc->level == 0); | |
5956 | if (trans->transaction->in_commit || | |
5957 | trans->transaction->delayed_refs.flushing) { | |
5958 | ret = btrfs_update_root(trans, tree_root, | |
5959 | &root->root_key, | |
5960 | root_item); | |
5961 | BUG_ON(ret); | |
5962 | ||
5963 | btrfs_end_transaction(trans, tree_root); | |
a22285a6 YZ |
5964 | trans = btrfs_start_transaction(tree_root, 0); |
5965 | if (IS_ERR(trans)) | |
5966 | return PTR_ERR(trans); | |
2c47e605 YZ |
5967 | } else { |
5968 | unsigned long update; | |
c3e69d58 CM |
5969 | update = trans->delayed_ref_updates; |
5970 | trans->delayed_ref_updates = 0; | |
5971 | if (update) | |
2c47e605 YZ |
5972 | btrfs_run_delayed_refs(trans, tree_root, |
5973 | update); | |
c3e69d58 | 5974 | } |
20524f02 | 5975 | } |
2c47e605 YZ |
5976 | btrfs_release_path(root, path); |
5977 | BUG_ON(err); | |
5978 | ||
5979 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
5980 | BUG_ON(ret); | |
5981 | ||
76dda93c YZ |
5982 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
5983 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
5984 | NULL, NULL); | |
5985 | BUG_ON(ret < 0); | |
5986 | if (ret > 0) { | |
5987 | ret = btrfs_del_orphan_item(trans, tree_root, | |
5988 | root->root_key.objectid); | |
5989 | BUG_ON(ret); | |
5990 | } | |
5991 | } | |
5992 | ||
5993 | if (root->in_radix) { | |
5994 | btrfs_free_fs_root(tree_root->fs_info, root); | |
5995 | } else { | |
5996 | free_extent_buffer(root->node); | |
5997 | free_extent_buffer(root->commit_root); | |
5998 | kfree(root); | |
5999 | } | |
9f3a7427 | 6000 | out: |
2c47e605 YZ |
6001 | btrfs_end_transaction(trans, tree_root); |
6002 | kfree(wc); | |
5caf2a00 | 6003 | btrfs_free_path(path); |
2c47e605 | 6004 | return err; |
20524f02 | 6005 | } |
9078a3e1 | 6006 | |
2c47e605 YZ |
6007 | /* |
6008 | * drop subtree rooted at tree block 'node'. | |
6009 | * | |
6010 | * NOTE: this function will unlock and release tree block 'node' | |
6011 | */ | |
f82d02d9 YZ |
6012 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
6013 | struct btrfs_root *root, | |
6014 | struct extent_buffer *node, | |
6015 | struct extent_buffer *parent) | |
6016 | { | |
6017 | struct btrfs_path *path; | |
2c47e605 | 6018 | struct walk_control *wc; |
f82d02d9 YZ |
6019 | int level; |
6020 | int parent_level; | |
6021 | int ret = 0; | |
6022 | int wret; | |
6023 | ||
2c47e605 YZ |
6024 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
6025 | ||
f82d02d9 YZ |
6026 | path = btrfs_alloc_path(); |
6027 | BUG_ON(!path); | |
6028 | ||
2c47e605 YZ |
6029 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
6030 | BUG_ON(!wc); | |
6031 | ||
b9447ef8 | 6032 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
6033 | parent_level = btrfs_header_level(parent); |
6034 | extent_buffer_get(parent); | |
6035 | path->nodes[parent_level] = parent; | |
6036 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
6037 | ||
b9447ef8 | 6038 | btrfs_assert_tree_locked(node); |
f82d02d9 | 6039 | level = btrfs_header_level(node); |
f82d02d9 YZ |
6040 | path->nodes[level] = node; |
6041 | path->slots[level] = 0; | |
2c47e605 YZ |
6042 | path->locks[level] = 1; |
6043 | ||
6044 | wc->refs[parent_level] = 1; | |
6045 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6046 | wc->level = level; | |
6047 | wc->shared_level = -1; | |
6048 | wc->stage = DROP_REFERENCE; | |
6049 | wc->update_ref = 0; | |
6050 | wc->keep_locks = 1; | |
1c4850e2 | 6051 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
6052 | |
6053 | while (1) { | |
2c47e605 YZ |
6054 | wret = walk_down_tree(trans, root, path, wc); |
6055 | if (wret < 0) { | |
f82d02d9 | 6056 | ret = wret; |
f82d02d9 | 6057 | break; |
2c47e605 | 6058 | } |
f82d02d9 | 6059 | |
2c47e605 | 6060 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
6061 | if (wret < 0) |
6062 | ret = wret; | |
6063 | if (wret != 0) | |
6064 | break; | |
6065 | } | |
6066 | ||
2c47e605 | 6067 | kfree(wc); |
f82d02d9 YZ |
6068 | btrfs_free_path(path); |
6069 | return ret; | |
6070 | } | |
6071 | ||
5d4f98a2 | 6072 | #if 0 |
8e7bf94f CM |
6073 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
6074 | unsigned long nr) | |
6075 | { | |
6076 | return min(last, start + nr - 1); | |
6077 | } | |
6078 | ||
d397712b | 6079 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
98ed5174 | 6080 | u64 len) |
edbd8d4e CM |
6081 | { |
6082 | u64 page_start; | |
6083 | u64 page_end; | |
1a40e23b | 6084 | unsigned long first_index; |
edbd8d4e | 6085 | unsigned long last_index; |
edbd8d4e CM |
6086 | unsigned long i; |
6087 | struct page *page; | |
d1310b2e | 6088 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 6089 | struct file_ra_state *ra; |
3eaa2885 | 6090 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
6091 | unsigned int total_read = 0; |
6092 | unsigned int total_dirty = 0; | |
6093 | int ret = 0; | |
4313b399 CM |
6094 | |
6095 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
6096 | |
6097 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 6098 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
6099 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
6100 | ||
1a40e23b ZY |
6101 | /* make sure the dirty trick played by the caller work */ |
6102 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
6103 | first_index, last_index); | |
6104 | if (ret) | |
6105 | goto out_unlock; | |
8e7bf94f | 6106 | |
4313b399 | 6107 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 6108 | |
1a40e23b ZY |
6109 | for (i = first_index ; i <= last_index; i++) { |
6110 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 6111 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 6112 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
6113 | } |
6114 | total_read++; | |
3eaa2885 CM |
6115 | again: |
6116 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 6117 | BUG_ON(1); |
edbd8d4e | 6118 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 6119 | if (!page) { |
1a40e23b | 6120 | ret = -ENOMEM; |
edbd8d4e | 6121 | goto out_unlock; |
a061fc8d | 6122 | } |
edbd8d4e CM |
6123 | if (!PageUptodate(page)) { |
6124 | btrfs_readpage(NULL, page); | |
6125 | lock_page(page); | |
6126 | if (!PageUptodate(page)) { | |
6127 | unlock_page(page); | |
6128 | page_cache_release(page); | |
1a40e23b | 6129 | ret = -EIO; |
edbd8d4e CM |
6130 | goto out_unlock; |
6131 | } | |
6132 | } | |
ec44a35c | 6133 | wait_on_page_writeback(page); |
3eaa2885 | 6134 | |
edbd8d4e CM |
6135 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
6136 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 6137 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 6138 | |
3eaa2885 CM |
6139 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
6140 | if (ordered) { | |
6141 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
6142 | unlock_page(page); | |
6143 | page_cache_release(page); | |
6144 | btrfs_start_ordered_extent(inode, ordered, 1); | |
6145 | btrfs_put_ordered_extent(ordered); | |
6146 | goto again; | |
6147 | } | |
6148 | set_page_extent_mapped(page); | |
6149 | ||
1a40e23b ZY |
6150 | if (i == first_index) |
6151 | set_extent_bits(io_tree, page_start, page_end, | |
6152 | EXTENT_BOUNDARY, GFP_NOFS); | |
1f80e4db | 6153 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b | 6154 | |
a061fc8d | 6155 | set_page_dirty(page); |
1a40e23b | 6156 | total_dirty++; |
edbd8d4e | 6157 | |
d1310b2e | 6158 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
6159 | unlock_page(page); |
6160 | page_cache_release(page); | |
6161 | } | |
6162 | ||
6163 | out_unlock: | |
ec44a35c | 6164 | kfree(ra); |
edbd8d4e | 6165 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
6166 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
6167 | return ret; | |
edbd8d4e CM |
6168 | } |
6169 | ||
d397712b | 6170 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
1a40e23b ZY |
6171 | struct btrfs_key *extent_key, |
6172 | u64 offset) | |
6173 | { | |
6174 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
6175 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
6176 | struct extent_map *em; | |
6643558d YZ |
6177 | u64 start = extent_key->objectid - offset; |
6178 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 6179 | |
1a40e23b ZY |
6180 | em = alloc_extent_map(GFP_NOFS); |
6181 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 6182 | |
6643558d | 6183 | em->start = start; |
1a40e23b | 6184 | em->len = extent_key->offset; |
c8b97818 | 6185 | em->block_len = extent_key->offset; |
1a40e23b ZY |
6186 | em->block_start = extent_key->objectid; |
6187 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
6188 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
6189 | ||
6190 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 6191 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
6192 | while (1) { |
6193 | int ret; | |
890871be | 6194 | write_lock(&em_tree->lock); |
1a40e23b | 6195 | ret = add_extent_mapping(em_tree, em); |
890871be | 6196 | write_unlock(&em_tree->lock); |
1a40e23b ZY |
6197 | if (ret != -EEXIST) { |
6198 | free_extent_map(em); | |
bf4ef679 CM |
6199 | break; |
6200 | } | |
6643558d | 6201 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 6202 | } |
6643558d | 6203 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 6204 | |
6643558d | 6205 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 6206 | } |
edbd8d4e | 6207 | |
1a40e23b ZY |
6208 | struct btrfs_ref_path { |
6209 | u64 extent_start; | |
6210 | u64 nodes[BTRFS_MAX_LEVEL]; | |
6211 | u64 root_objectid; | |
6212 | u64 root_generation; | |
6213 | u64 owner_objectid; | |
1a40e23b ZY |
6214 | u32 num_refs; |
6215 | int lowest_level; | |
6216 | int current_level; | |
f82d02d9 YZ |
6217 | int shared_level; |
6218 | ||
6219 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
6220 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 6221 | }; |
7d9eb12c | 6222 | |
1a40e23b | 6223 | struct disk_extent { |
c8b97818 | 6224 | u64 ram_bytes; |
1a40e23b ZY |
6225 | u64 disk_bytenr; |
6226 | u64 disk_num_bytes; | |
6227 | u64 offset; | |
6228 | u64 num_bytes; | |
c8b97818 CM |
6229 | u8 compression; |
6230 | u8 encryption; | |
6231 | u16 other_encoding; | |
1a40e23b | 6232 | }; |
4313b399 | 6233 | |
1a40e23b ZY |
6234 | static int is_cowonly_root(u64 root_objectid) |
6235 | { | |
6236 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
6237 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
6238 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
6239 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
0403e47e YZ |
6240 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
6241 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1a40e23b ZY |
6242 | return 1; |
6243 | return 0; | |
6244 | } | |
edbd8d4e | 6245 | |
d397712b | 6246 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6247 | struct btrfs_root *extent_root, |
6248 | struct btrfs_ref_path *ref_path, | |
6249 | int first_time) | |
6250 | { | |
6251 | struct extent_buffer *leaf; | |
6252 | struct btrfs_path *path; | |
6253 | struct btrfs_extent_ref *ref; | |
6254 | struct btrfs_key key; | |
6255 | struct btrfs_key found_key; | |
6256 | u64 bytenr; | |
6257 | u32 nritems; | |
6258 | int level; | |
6259 | int ret = 1; | |
edbd8d4e | 6260 | |
1a40e23b ZY |
6261 | path = btrfs_alloc_path(); |
6262 | if (!path) | |
6263 | return -ENOMEM; | |
bf4ef679 | 6264 | |
1a40e23b ZY |
6265 | if (first_time) { |
6266 | ref_path->lowest_level = -1; | |
6267 | ref_path->current_level = -1; | |
f82d02d9 | 6268 | ref_path->shared_level = -1; |
1a40e23b ZY |
6269 | goto walk_up; |
6270 | } | |
6271 | walk_down: | |
6272 | level = ref_path->current_level - 1; | |
6273 | while (level >= -1) { | |
6274 | u64 parent; | |
6275 | if (level < ref_path->lowest_level) | |
6276 | break; | |
bf4ef679 | 6277 | |
d397712b | 6278 | if (level >= 0) |
1a40e23b | 6279 | bytenr = ref_path->nodes[level]; |
d397712b | 6280 | else |
1a40e23b | 6281 | bytenr = ref_path->extent_start; |
1a40e23b | 6282 | BUG_ON(bytenr == 0); |
bf4ef679 | 6283 | |
1a40e23b ZY |
6284 | parent = ref_path->nodes[level + 1]; |
6285 | ref_path->nodes[level + 1] = 0; | |
6286 | ref_path->current_level = level; | |
6287 | BUG_ON(parent == 0); | |
0ef3e66b | 6288 | |
1a40e23b ZY |
6289 | key.objectid = bytenr; |
6290 | key.offset = parent + 1; | |
6291 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 6292 | |
1a40e23b ZY |
6293 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
6294 | if (ret < 0) | |
edbd8d4e | 6295 | goto out; |
1a40e23b | 6296 | BUG_ON(ret == 0); |
7d9eb12c | 6297 | |
1a40e23b ZY |
6298 | leaf = path->nodes[0]; |
6299 | nritems = btrfs_header_nritems(leaf); | |
6300 | if (path->slots[0] >= nritems) { | |
6301 | ret = btrfs_next_leaf(extent_root, path); | |
6302 | if (ret < 0) | |
6303 | goto out; | |
6304 | if (ret > 0) | |
6305 | goto next; | |
6306 | leaf = path->nodes[0]; | |
6307 | } | |
0ef3e66b | 6308 | |
1a40e23b ZY |
6309 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6310 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
6311 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
6312 | if (level < ref_path->shared_level) | |
6313 | ref_path->shared_level = level; | |
1a40e23b | 6314 | goto found; |
f82d02d9 | 6315 | } |
1a40e23b ZY |
6316 | next: |
6317 | level--; | |
6318 | btrfs_release_path(extent_root, path); | |
d899e052 | 6319 | cond_resched(); |
1a40e23b ZY |
6320 | } |
6321 | /* reached lowest level */ | |
6322 | ret = 1; | |
6323 | goto out; | |
6324 | walk_up: | |
6325 | level = ref_path->current_level; | |
6326 | while (level < BTRFS_MAX_LEVEL - 1) { | |
6327 | u64 ref_objectid; | |
d397712b CM |
6328 | |
6329 | if (level >= 0) | |
1a40e23b | 6330 | bytenr = ref_path->nodes[level]; |
d397712b | 6331 | else |
1a40e23b | 6332 | bytenr = ref_path->extent_start; |
d397712b | 6333 | |
1a40e23b | 6334 | BUG_ON(bytenr == 0); |
edbd8d4e | 6335 | |
1a40e23b ZY |
6336 | key.objectid = bytenr; |
6337 | key.offset = 0; | |
6338 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 6339 | |
1a40e23b ZY |
6340 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
6341 | if (ret < 0) | |
6342 | goto out; | |
edbd8d4e | 6343 | |
1a40e23b ZY |
6344 | leaf = path->nodes[0]; |
6345 | nritems = btrfs_header_nritems(leaf); | |
6346 | if (path->slots[0] >= nritems) { | |
6347 | ret = btrfs_next_leaf(extent_root, path); | |
6348 | if (ret < 0) | |
6349 | goto out; | |
6350 | if (ret > 0) { | |
6351 | /* the extent was freed by someone */ | |
6352 | if (ref_path->lowest_level == level) | |
6353 | goto out; | |
6354 | btrfs_release_path(extent_root, path); | |
6355 | goto walk_down; | |
6356 | } | |
6357 | leaf = path->nodes[0]; | |
6358 | } | |
edbd8d4e | 6359 | |
1a40e23b ZY |
6360 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6361 | if (found_key.objectid != bytenr || | |
6362 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
6363 | /* the extent was freed by someone */ | |
6364 | if (ref_path->lowest_level == level) { | |
6365 | ret = 1; | |
6366 | goto out; | |
6367 | } | |
6368 | btrfs_release_path(extent_root, path); | |
6369 | goto walk_down; | |
6370 | } | |
6371 | found: | |
6372 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
6373 | struct btrfs_extent_ref); | |
6374 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
6375 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
6376 | if (first_time) { | |
6377 | level = (int)ref_objectid; | |
6378 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
6379 | ref_path->lowest_level = level; | |
6380 | ref_path->current_level = level; | |
6381 | ref_path->nodes[level] = bytenr; | |
6382 | } else { | |
6383 | WARN_ON(ref_objectid != level); | |
6384 | } | |
6385 | } else { | |
6386 | WARN_ON(level != -1); | |
6387 | } | |
6388 | first_time = 0; | |
bf4ef679 | 6389 | |
1a40e23b ZY |
6390 | if (ref_path->lowest_level == level) { |
6391 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
6392 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
6393 | } | |
bf4ef679 | 6394 | |
7d9eb12c | 6395 | /* |
1a40e23b ZY |
6396 | * the block is tree root or the block isn't in reference |
6397 | * counted tree. | |
7d9eb12c | 6398 | */ |
1a40e23b ZY |
6399 | if (found_key.objectid == found_key.offset || |
6400 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
6401 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
6402 | ref_path->root_generation = | |
6403 | btrfs_ref_generation(leaf, ref); | |
6404 | if (level < 0) { | |
6405 | /* special reference from the tree log */ | |
6406 | ref_path->nodes[0] = found_key.offset; | |
6407 | ref_path->current_level = 0; | |
6408 | } | |
6409 | ret = 0; | |
6410 | goto out; | |
6411 | } | |
7d9eb12c | 6412 | |
1a40e23b ZY |
6413 | level++; |
6414 | BUG_ON(ref_path->nodes[level] != 0); | |
6415 | ref_path->nodes[level] = found_key.offset; | |
6416 | ref_path->current_level = level; | |
bf4ef679 | 6417 | |
1a40e23b ZY |
6418 | /* |
6419 | * the reference was created in the running transaction, | |
6420 | * no need to continue walking up. | |
6421 | */ | |
6422 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
6423 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
6424 | ref_path->root_generation = | |
6425 | btrfs_ref_generation(leaf, ref); | |
6426 | ret = 0; | |
6427 | goto out; | |
7d9eb12c CM |
6428 | } |
6429 | ||
1a40e23b | 6430 | btrfs_release_path(extent_root, path); |
d899e052 | 6431 | cond_resched(); |
7d9eb12c | 6432 | } |
1a40e23b ZY |
6433 | /* reached max tree level, but no tree root found. */ |
6434 | BUG(); | |
edbd8d4e | 6435 | out: |
1a40e23b ZY |
6436 | btrfs_free_path(path); |
6437 | return ret; | |
edbd8d4e CM |
6438 | } |
6439 | ||
1a40e23b ZY |
6440 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
6441 | struct btrfs_root *extent_root, | |
6442 | struct btrfs_ref_path *ref_path, | |
6443 | u64 extent_start) | |
a061fc8d | 6444 | { |
1a40e23b ZY |
6445 | memset(ref_path, 0, sizeof(*ref_path)); |
6446 | ref_path->extent_start = extent_start; | |
a061fc8d | 6447 | |
1a40e23b | 6448 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
6449 | } |
6450 | ||
1a40e23b ZY |
6451 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
6452 | struct btrfs_root *extent_root, | |
6453 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 6454 | { |
1a40e23b ZY |
6455 | return __next_ref_path(trans, extent_root, ref_path, 0); |
6456 | } | |
6457 | ||
d397712b | 6458 | static noinline int get_new_locations(struct inode *reloc_inode, |
1a40e23b ZY |
6459 | struct btrfs_key *extent_key, |
6460 | u64 offset, int no_fragment, | |
6461 | struct disk_extent **extents, | |
6462 | int *nr_extents) | |
6463 | { | |
6464 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
6465 | struct btrfs_path *path; | |
6466 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 6467 | struct extent_buffer *leaf; |
1a40e23b ZY |
6468 | struct disk_extent *exts = *extents; |
6469 | struct btrfs_key found_key; | |
6470 | u64 cur_pos; | |
6471 | u64 last_byte; | |
edbd8d4e | 6472 | u32 nritems; |
1a40e23b ZY |
6473 | int nr = 0; |
6474 | int max = *nr_extents; | |
6475 | int ret; | |
edbd8d4e | 6476 | |
1a40e23b ZY |
6477 | WARN_ON(!no_fragment && *extents); |
6478 | if (!exts) { | |
6479 | max = 1; | |
6480 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
6481 | if (!exts) | |
6482 | return -ENOMEM; | |
a061fc8d | 6483 | } |
edbd8d4e | 6484 | |
1a40e23b ZY |
6485 | path = btrfs_alloc_path(); |
6486 | BUG_ON(!path); | |
edbd8d4e | 6487 | |
1a40e23b ZY |
6488 | cur_pos = extent_key->objectid - offset; |
6489 | last_byte = extent_key->objectid + extent_key->offset; | |
6490 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
6491 | cur_pos, 0); | |
6492 | if (ret < 0) | |
6493 | goto out; | |
6494 | if (ret > 0) { | |
6495 | ret = -ENOENT; | |
6496 | goto out; | |
6497 | } | |
edbd8d4e | 6498 | |
1a40e23b | 6499 | while (1) { |
edbd8d4e CM |
6500 | leaf = path->nodes[0]; |
6501 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
6502 | if (path->slots[0] >= nritems) { |
6503 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
6504 | if (ret < 0) |
6505 | goto out; | |
1a40e23b ZY |
6506 | if (ret > 0) |
6507 | break; | |
bf4ef679 | 6508 | leaf = path->nodes[0]; |
a061fc8d | 6509 | } |
edbd8d4e CM |
6510 | |
6511 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
6512 | if (found_key.offset != cur_pos || |
6513 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
6514 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
6515 | break; |
6516 | ||
1a40e23b ZY |
6517 | fi = btrfs_item_ptr(leaf, path->slots[0], |
6518 | struct btrfs_file_extent_item); | |
6519 | if (btrfs_file_extent_type(leaf, fi) != | |
6520 | BTRFS_FILE_EXTENT_REG || | |
6521 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 6522 | break; |
1a40e23b ZY |
6523 | |
6524 | if (nr == max) { | |
6525 | struct disk_extent *old = exts; | |
6526 | max *= 2; | |
6527 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
6528 | memcpy(exts, old, sizeof(*exts) * nr); | |
6529 | if (old != *extents) | |
6530 | kfree(old); | |
a061fc8d | 6531 | } |
edbd8d4e | 6532 | |
1a40e23b ZY |
6533 | exts[nr].disk_bytenr = |
6534 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
6535 | exts[nr].disk_num_bytes = | |
6536 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
6537 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
6538 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
6539 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
6540 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
6541 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
6542 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
6543 | fi); | |
d899e052 YZ |
6544 | BUG_ON(exts[nr].offset > 0); |
6545 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
6546 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 6547 | |
1a40e23b ZY |
6548 | cur_pos += exts[nr].num_bytes; |
6549 | nr++; | |
6550 | ||
6551 | if (cur_pos + offset >= last_byte) | |
6552 | break; | |
6553 | ||
6554 | if (no_fragment) { | |
6555 | ret = 1; | |
edbd8d4e | 6556 | goto out; |
1a40e23b ZY |
6557 | } |
6558 | path->slots[0]++; | |
6559 | } | |
6560 | ||
1f80e4db | 6561 | BUG_ON(cur_pos + offset > last_byte); |
1a40e23b ZY |
6562 | if (cur_pos + offset < last_byte) { |
6563 | ret = -ENOENT; | |
6564 | goto out; | |
edbd8d4e CM |
6565 | } |
6566 | ret = 0; | |
6567 | out: | |
1a40e23b ZY |
6568 | btrfs_free_path(path); |
6569 | if (ret) { | |
6570 | if (exts != *extents) | |
6571 | kfree(exts); | |
6572 | } else { | |
6573 | *extents = exts; | |
6574 | *nr_extents = nr; | |
6575 | } | |
6576 | return ret; | |
6577 | } | |
6578 | ||
d397712b | 6579 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6580 | struct btrfs_root *root, |
6581 | struct btrfs_path *path, | |
6582 | struct btrfs_key *extent_key, | |
6583 | struct btrfs_key *leaf_key, | |
6584 | struct btrfs_ref_path *ref_path, | |
6585 | struct disk_extent *new_extents, | |
6586 | int nr_extents) | |
6587 | { | |
6588 | struct extent_buffer *leaf; | |
6589 | struct btrfs_file_extent_item *fi; | |
6590 | struct inode *inode = NULL; | |
6591 | struct btrfs_key key; | |
6592 | u64 lock_start = 0; | |
6593 | u64 lock_end = 0; | |
6594 | u64 num_bytes; | |
6595 | u64 ext_offset; | |
86288a19 | 6596 | u64 search_end = (u64)-1; |
1a40e23b | 6597 | u32 nritems; |
3bb1a1bc | 6598 | int nr_scaned = 0; |
1a40e23b | 6599 | int extent_locked = 0; |
d899e052 | 6600 | int extent_type; |
1a40e23b ZY |
6601 | int ret; |
6602 | ||
3bb1a1bc | 6603 | memcpy(&key, leaf_key, sizeof(key)); |
1a40e23b | 6604 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
6605 | if (key.objectid < ref_path->owner_objectid || |
6606 | (key.objectid == ref_path->owner_objectid && | |
6607 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
6608 | key.objectid = ref_path->owner_objectid; | |
6609 | key.type = BTRFS_EXTENT_DATA_KEY; | |
6610 | key.offset = 0; | |
6611 | } | |
1a40e23b ZY |
6612 | } |
6613 | ||
6614 | while (1) { | |
6615 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
6616 | if (ret < 0) | |
6617 | goto out; | |
6618 | ||
6619 | leaf = path->nodes[0]; | |
6620 | nritems = btrfs_header_nritems(leaf); | |
6621 | next: | |
6622 | if (extent_locked && ret > 0) { | |
6623 | /* | |
6624 | * the file extent item was modified by someone | |
6625 | * before the extent got locked. | |
6626 | */ | |
1a40e23b ZY |
6627 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6628 | lock_end, GFP_NOFS); | |
6629 | extent_locked = 0; | |
6630 | } | |
6631 | ||
6632 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 6633 | if (++nr_scaned > 2) |
1a40e23b ZY |
6634 | break; |
6635 | ||
6636 | BUG_ON(extent_locked); | |
6637 | ret = btrfs_next_leaf(root, path); | |
6638 | if (ret < 0) | |
6639 | goto out; | |
6640 | if (ret > 0) | |
6641 | break; | |
6642 | leaf = path->nodes[0]; | |
6643 | nritems = btrfs_header_nritems(leaf); | |
6644 | } | |
6645 | ||
6646 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
6647 | ||
6648 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
6649 | if ((key.objectid > ref_path->owner_objectid) || | |
6650 | (key.objectid == ref_path->owner_objectid && | |
6651 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
86288a19 | 6652 | key.offset >= search_end) |
1a40e23b ZY |
6653 | break; |
6654 | } | |
6655 | ||
6656 | if (inode && key.objectid != inode->i_ino) { | |
6657 | BUG_ON(extent_locked); | |
6658 | btrfs_release_path(root, path); | |
6659 | mutex_unlock(&inode->i_mutex); | |
6660 | iput(inode); | |
6661 | inode = NULL; | |
6662 | continue; | |
6663 | } | |
6664 | ||
6665 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
6666 | path->slots[0]++; | |
6667 | ret = 1; | |
6668 | goto next; | |
6669 | } | |
6670 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
6671 | struct btrfs_file_extent_item); | |
d899e052 YZ |
6672 | extent_type = btrfs_file_extent_type(leaf, fi); |
6673 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
6674 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
6675 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
6676 | extent_key->objectid)) { | |
6677 | path->slots[0]++; | |
6678 | ret = 1; | |
6679 | goto next; | |
6680 | } | |
6681 | ||
6682 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
6683 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
6684 | ||
86288a19 YZ |
6685 | if (search_end == (u64)-1) { |
6686 | search_end = key.offset - ext_offset + | |
6687 | btrfs_file_extent_ram_bytes(leaf, fi); | |
6688 | } | |
1a40e23b ZY |
6689 | |
6690 | if (!extent_locked) { | |
6691 | lock_start = key.offset; | |
6692 | lock_end = lock_start + num_bytes - 1; | |
6693 | } else { | |
6643558d YZ |
6694 | if (lock_start > key.offset || |
6695 | lock_end + 1 < key.offset + num_bytes) { | |
6696 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
6697 | lock_start, lock_end, GFP_NOFS); | |
6698 | extent_locked = 0; | |
6699 | } | |
1a40e23b ZY |
6700 | } |
6701 | ||
6702 | if (!inode) { | |
6703 | btrfs_release_path(root, path); | |
6704 | ||
6705 | inode = btrfs_iget_locked(root->fs_info->sb, | |
6706 | key.objectid, root); | |
6707 | if (inode->i_state & I_NEW) { | |
6708 | BTRFS_I(inode)->root = root; | |
6709 | BTRFS_I(inode)->location.objectid = | |
6710 | key.objectid; | |
6711 | BTRFS_I(inode)->location.type = | |
6712 | BTRFS_INODE_ITEM_KEY; | |
6713 | BTRFS_I(inode)->location.offset = 0; | |
6714 | btrfs_read_locked_inode(inode); | |
6715 | unlock_new_inode(inode); | |
6716 | } | |
6717 | /* | |
6718 | * some code call btrfs_commit_transaction while | |
6719 | * holding the i_mutex, so we can't use mutex_lock | |
6720 | * here. | |
6721 | */ | |
6722 | if (is_bad_inode(inode) || | |
6723 | !mutex_trylock(&inode->i_mutex)) { | |
6724 | iput(inode); | |
6725 | inode = NULL; | |
6726 | key.offset = (u64)-1; | |
6727 | goto skip; | |
6728 | } | |
6729 | } | |
6730 | ||
6731 | if (!extent_locked) { | |
6732 | struct btrfs_ordered_extent *ordered; | |
6733 | ||
6734 | btrfs_release_path(root, path); | |
6735 | ||
6736 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
6737 | lock_end, GFP_NOFS); | |
6738 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
6739 | lock_end); | |
6740 | if (ordered && | |
6741 | ordered->file_offset <= lock_end && | |
6742 | ordered->file_offset + ordered->len > lock_start) { | |
6743 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
6744 | lock_start, lock_end, GFP_NOFS); | |
6745 | btrfs_start_ordered_extent(inode, ordered, 1); | |
6746 | btrfs_put_ordered_extent(ordered); | |
6747 | key.offset += num_bytes; | |
6748 | goto skip; | |
6749 | } | |
6750 | if (ordered) | |
6751 | btrfs_put_ordered_extent(ordered); | |
6752 | ||
1a40e23b ZY |
6753 | extent_locked = 1; |
6754 | continue; | |
6755 | } | |
6756 | ||
6757 | if (nr_extents == 1) { | |
6758 | /* update extent pointer in place */ | |
1a40e23b ZY |
6759 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
6760 | new_extents[0].disk_bytenr); | |
6761 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
6762 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
6763 | btrfs_mark_buffer_dirty(leaf); |
6764 | ||
6765 | btrfs_drop_extent_cache(inode, key.offset, | |
6766 | key.offset + num_bytes - 1, 0); | |
6767 | ||
6768 | ret = btrfs_inc_extent_ref(trans, root, | |
6769 | new_extents[0].disk_bytenr, | |
6770 | new_extents[0].disk_num_bytes, | |
6771 | leaf->start, | |
6772 | root->root_key.objectid, | |
6773 | trans->transid, | |
3bb1a1bc | 6774 | key.objectid); |
1a40e23b ZY |
6775 | BUG_ON(ret); |
6776 | ||
6777 | ret = btrfs_free_extent(trans, root, | |
6778 | extent_key->objectid, | |
6779 | extent_key->offset, | |
6780 | leaf->start, | |
6781 | btrfs_header_owner(leaf), | |
6782 | btrfs_header_generation(leaf), | |
3bb1a1bc | 6783 | key.objectid, 0); |
1a40e23b ZY |
6784 | BUG_ON(ret); |
6785 | ||
6786 | btrfs_release_path(root, path); | |
6787 | key.offset += num_bytes; | |
6788 | } else { | |
d899e052 YZ |
6789 | BUG_ON(1); |
6790 | #if 0 | |
1a40e23b ZY |
6791 | u64 alloc_hint; |
6792 | u64 extent_len; | |
6793 | int i; | |
6794 | /* | |
6795 | * drop old extent pointer at first, then insert the | |
6796 | * new pointers one bye one | |
6797 | */ | |
6798 | btrfs_release_path(root, path); | |
6799 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
6800 | key.offset + num_bytes, | |
6801 | key.offset, &alloc_hint); | |
6802 | BUG_ON(ret); | |
6803 | ||
6804 | for (i = 0; i < nr_extents; i++) { | |
6805 | if (ext_offset >= new_extents[i].num_bytes) { | |
6806 | ext_offset -= new_extents[i].num_bytes; | |
6807 | continue; | |
6808 | } | |
6809 | extent_len = min(new_extents[i].num_bytes - | |
6810 | ext_offset, num_bytes); | |
6811 | ||
6812 | ret = btrfs_insert_empty_item(trans, root, | |
6813 | path, &key, | |
6814 | sizeof(*fi)); | |
6815 | BUG_ON(ret); | |
6816 | ||
6817 | leaf = path->nodes[0]; | |
6818 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
6819 | struct btrfs_file_extent_item); | |
6820 | btrfs_set_file_extent_generation(leaf, fi, | |
6821 | trans->transid); | |
6822 | btrfs_set_file_extent_type(leaf, fi, | |
6823 | BTRFS_FILE_EXTENT_REG); | |
6824 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
6825 | new_extents[i].disk_bytenr); | |
6826 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
6827 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
6828 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
6829 | new_extents[i].ram_bytes); | |
6830 | ||
6831 | btrfs_set_file_extent_compression(leaf, fi, | |
6832 | new_extents[i].compression); | |
6833 | btrfs_set_file_extent_encryption(leaf, fi, | |
6834 | new_extents[i].encryption); | |
6835 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
6836 | new_extents[i].other_encoding); | |
6837 | ||
1a40e23b ZY |
6838 | btrfs_set_file_extent_num_bytes(leaf, fi, |
6839 | extent_len); | |
6840 | ext_offset += new_extents[i].offset; | |
6841 | btrfs_set_file_extent_offset(leaf, fi, | |
6842 | ext_offset); | |
6843 | btrfs_mark_buffer_dirty(leaf); | |
6844 | ||
6845 | btrfs_drop_extent_cache(inode, key.offset, | |
6846 | key.offset + extent_len - 1, 0); | |
6847 | ||
6848 | ret = btrfs_inc_extent_ref(trans, root, | |
6849 | new_extents[i].disk_bytenr, | |
6850 | new_extents[i].disk_num_bytes, | |
6851 | leaf->start, | |
6852 | root->root_key.objectid, | |
3bb1a1bc | 6853 | trans->transid, key.objectid); |
1a40e23b ZY |
6854 | BUG_ON(ret); |
6855 | btrfs_release_path(root, path); | |
6856 | ||
a76a3cd4 | 6857 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
6858 | |
6859 | ext_offset = 0; | |
6860 | num_bytes -= extent_len; | |
6861 | key.offset += extent_len; | |
6862 | ||
6863 | if (num_bytes == 0) | |
6864 | break; | |
6865 | } | |
6866 | BUG_ON(i >= nr_extents); | |
d899e052 | 6867 | #endif |
1a40e23b ZY |
6868 | } |
6869 | ||
6870 | if (extent_locked) { | |
1a40e23b ZY |
6871 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6872 | lock_end, GFP_NOFS); | |
6873 | extent_locked = 0; | |
6874 | } | |
6875 | skip: | |
6876 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
86288a19 | 6877 | key.offset >= search_end) |
1a40e23b ZY |
6878 | break; |
6879 | ||
6880 | cond_resched(); | |
6881 | } | |
6882 | ret = 0; | |
6883 | out: | |
6884 | btrfs_release_path(root, path); | |
6885 | if (inode) { | |
6886 | mutex_unlock(&inode->i_mutex); | |
6887 | if (extent_locked) { | |
1a40e23b ZY |
6888 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
6889 | lock_end, GFP_NOFS); | |
6890 | } | |
6891 | iput(inode); | |
6892 | } | |
6893 | return ret; | |
6894 | } | |
6895 | ||
1a40e23b ZY |
6896 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
6897 | struct btrfs_root *root, | |
6898 | struct extent_buffer *buf, u64 orig_start) | |
6899 | { | |
6900 | int level; | |
6901 | int ret; | |
6902 | ||
6903 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
6904 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
6905 | ||
6906 | level = btrfs_header_level(buf); | |
6907 | if (level == 0) { | |
6908 | struct btrfs_leaf_ref *ref; | |
6909 | struct btrfs_leaf_ref *orig_ref; | |
6910 | ||
6911 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
6912 | if (!orig_ref) | |
6913 | return -ENOENT; | |
6914 | ||
6915 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
6916 | if (!ref) { | |
6917 | btrfs_free_leaf_ref(root, orig_ref); | |
6918 | return -ENOMEM; | |
6919 | } | |
6920 | ||
6921 | ref->nritems = orig_ref->nritems; | |
6922 | memcpy(ref->extents, orig_ref->extents, | |
6923 | sizeof(ref->extents[0]) * ref->nritems); | |
6924 | ||
6925 | btrfs_free_leaf_ref(root, orig_ref); | |
6926 | ||
6927 | ref->root_gen = trans->transid; | |
6928 | ref->bytenr = buf->start; | |
6929 | ref->owner = btrfs_header_owner(buf); | |
6930 | ref->generation = btrfs_header_generation(buf); | |
bd56b302 | 6931 | |
1a40e23b ZY |
6932 | ret = btrfs_add_leaf_ref(root, ref, 0); |
6933 | WARN_ON(ret); | |
6934 | btrfs_free_leaf_ref(root, ref); | |
6935 | } | |
6936 | return 0; | |
6937 | } | |
6938 | ||
d397712b | 6939 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
1a40e23b ZY |
6940 | struct extent_buffer *leaf, |
6941 | struct btrfs_block_group_cache *group, | |
6942 | struct btrfs_root *target_root) | |
6943 | { | |
6944 | struct btrfs_key key; | |
6945 | struct inode *inode = NULL; | |
6946 | struct btrfs_file_extent_item *fi; | |
2ac55d41 | 6947 | struct extent_state *cached_state = NULL; |
1a40e23b ZY |
6948 | u64 num_bytes; |
6949 | u64 skip_objectid = 0; | |
6950 | u32 nritems; | |
6951 | u32 i; | |
6952 | ||
6953 | nritems = btrfs_header_nritems(leaf); | |
6954 | for (i = 0; i < nritems; i++) { | |
6955 | btrfs_item_key_to_cpu(leaf, &key, i); | |
6956 | if (key.objectid == skip_objectid || | |
6957 | key.type != BTRFS_EXTENT_DATA_KEY) | |
6958 | continue; | |
6959 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
6960 | if (btrfs_file_extent_type(leaf, fi) == | |
6961 | BTRFS_FILE_EXTENT_INLINE) | |
6962 | continue; | |
6963 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
6964 | continue; | |
6965 | if (!inode || inode->i_ino != key.objectid) { | |
6966 | iput(inode); | |
6967 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
6968 | key.objectid, target_root, 1); | |
6969 | } | |
6970 | if (!inode) { | |
6971 | skip_objectid = key.objectid; | |
6972 | continue; | |
6973 | } | |
6974 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
6975 | ||
2ac55d41 JB |
6976 | lock_extent_bits(&BTRFS_I(inode)->io_tree, key.offset, |
6977 | key.offset + num_bytes - 1, 0, &cached_state, | |
6978 | GFP_NOFS); | |
1a40e23b ZY |
6979 | btrfs_drop_extent_cache(inode, key.offset, |
6980 | key.offset + num_bytes - 1, 1); | |
2ac55d41 JB |
6981 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, key.offset, |
6982 | key.offset + num_bytes - 1, &cached_state, | |
6983 | GFP_NOFS); | |
1a40e23b ZY |
6984 | cond_resched(); |
6985 | } | |
6986 | iput(inode); | |
6987 | return 0; | |
6988 | } | |
6989 | ||
d397712b | 6990 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
6991 | struct btrfs_root *root, |
6992 | struct extent_buffer *leaf, | |
6993 | struct btrfs_block_group_cache *group, | |
6994 | struct inode *reloc_inode) | |
6995 | { | |
6996 | struct btrfs_key key; | |
6997 | struct btrfs_key extent_key; | |
6998 | struct btrfs_file_extent_item *fi; | |
6999 | struct btrfs_leaf_ref *ref; | |
7000 | struct disk_extent *new_extent; | |
7001 | u64 bytenr; | |
7002 | u64 num_bytes; | |
7003 | u32 nritems; | |
7004 | u32 i; | |
7005 | int ext_index; | |
7006 | int nr_extent; | |
7007 | int ret; | |
7008 | ||
7009 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
7010 | BUG_ON(!new_extent); | |
7011 | ||
7012 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
7013 | BUG_ON(!ref); | |
7014 | ||
7015 | ext_index = -1; | |
7016 | nritems = btrfs_header_nritems(leaf); | |
7017 | for (i = 0; i < nritems; i++) { | |
7018 | btrfs_item_key_to_cpu(leaf, &key, i); | |
7019 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
7020 | continue; | |
7021 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
7022 | if (btrfs_file_extent_type(leaf, fi) == | |
7023 | BTRFS_FILE_EXTENT_INLINE) | |
7024 | continue; | |
7025 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
7026 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
7027 | if (bytenr == 0) | |
7028 | continue; | |
7029 | ||
7030 | ext_index++; | |
7031 | if (bytenr >= group->key.objectid + group->key.offset || | |
7032 | bytenr + num_bytes <= group->key.objectid) | |
7033 | continue; | |
7034 | ||
7035 | extent_key.objectid = bytenr; | |
7036 | extent_key.offset = num_bytes; | |
7037 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
7038 | nr_extent = 1; | |
7039 | ret = get_new_locations(reloc_inode, &extent_key, | |
7040 | group->key.objectid, 1, | |
7041 | &new_extent, &nr_extent); | |
7042 | if (ret > 0) | |
7043 | continue; | |
7044 | BUG_ON(ret < 0); | |
7045 | ||
7046 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
7047 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
7048 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
7049 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
7050 | ||
1a40e23b ZY |
7051 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
7052 | new_extent->disk_bytenr); | |
7053 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
7054 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
7055 | btrfs_mark_buffer_dirty(leaf); |
7056 | ||
7057 | ret = btrfs_inc_extent_ref(trans, root, | |
7058 | new_extent->disk_bytenr, | |
7059 | new_extent->disk_num_bytes, | |
7060 | leaf->start, | |
7061 | root->root_key.objectid, | |
3bb1a1bc | 7062 | trans->transid, key.objectid); |
1a40e23b | 7063 | BUG_ON(ret); |
56bec294 | 7064 | |
1a40e23b ZY |
7065 | ret = btrfs_free_extent(trans, root, |
7066 | bytenr, num_bytes, leaf->start, | |
7067 | btrfs_header_owner(leaf), | |
7068 | btrfs_header_generation(leaf), | |
3bb1a1bc | 7069 | key.objectid, 0); |
1a40e23b ZY |
7070 | BUG_ON(ret); |
7071 | cond_resched(); | |
7072 | } | |
7073 | kfree(new_extent); | |
7074 | BUG_ON(ext_index + 1 != ref->nritems); | |
7075 | btrfs_free_leaf_ref(root, ref); | |
7076 | return 0; | |
7077 | } | |
7078 | ||
f82d02d9 YZ |
7079 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
7080 | struct btrfs_root *root) | |
1a40e23b ZY |
7081 | { |
7082 | struct btrfs_root *reloc_root; | |
f82d02d9 | 7083 | int ret; |
1a40e23b ZY |
7084 | |
7085 | if (root->reloc_root) { | |
7086 | reloc_root = root->reloc_root; | |
7087 | root->reloc_root = NULL; | |
7088 | list_add(&reloc_root->dead_list, | |
7089 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
7090 | |
7091 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
7092 | reloc_root->node->start); | |
7093 | btrfs_set_root_level(&root->root_item, | |
7094 | btrfs_header_level(reloc_root->node)); | |
7095 | memset(&reloc_root->root_item.drop_progress, 0, | |
7096 | sizeof(struct btrfs_disk_key)); | |
7097 | reloc_root->root_item.drop_level = 0; | |
7098 | ||
7099 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
7100 | &reloc_root->root_key, | |
7101 | &reloc_root->root_item); | |
7102 | BUG_ON(ret); | |
1a40e23b ZY |
7103 | } |
7104 | return 0; | |
7105 | } | |
7106 | ||
7107 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
7108 | { | |
7109 | struct btrfs_trans_handle *trans; | |
7110 | struct btrfs_root *reloc_root; | |
7111 | struct btrfs_root *prev_root = NULL; | |
7112 | struct list_head dead_roots; | |
7113 | int ret; | |
7114 | unsigned long nr; | |
7115 | ||
7116 | INIT_LIST_HEAD(&dead_roots); | |
7117 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
7118 | ||
7119 | while (!list_empty(&dead_roots)) { | |
7120 | reloc_root = list_entry(dead_roots.prev, | |
7121 | struct btrfs_root, dead_list); | |
7122 | list_del_init(&reloc_root->dead_list); | |
7123 | ||
7124 | BUG_ON(reloc_root->commit_root != NULL); | |
7125 | while (1) { | |
7126 | trans = btrfs_join_transaction(root, 1); | |
7127 | BUG_ON(!trans); | |
7128 | ||
7129 | mutex_lock(&root->fs_info->drop_mutex); | |
7130 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
7131 | if (ret != -EAGAIN) | |
7132 | break; | |
7133 | mutex_unlock(&root->fs_info->drop_mutex); | |
7134 | ||
7135 | nr = trans->blocks_used; | |
7136 | ret = btrfs_end_transaction(trans, root); | |
7137 | BUG_ON(ret); | |
7138 | btrfs_btree_balance_dirty(root, nr); | |
7139 | } | |
7140 | ||
7141 | free_extent_buffer(reloc_root->node); | |
7142 | ||
7143 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
7144 | &reloc_root->root_key); | |
7145 | BUG_ON(ret); | |
7146 | mutex_unlock(&root->fs_info->drop_mutex); | |
7147 | ||
7148 | nr = trans->blocks_used; | |
7149 | ret = btrfs_end_transaction(trans, root); | |
7150 | BUG_ON(ret); | |
7151 | btrfs_btree_balance_dirty(root, nr); | |
7152 | ||
7153 | kfree(prev_root); | |
7154 | prev_root = reloc_root; | |
7155 | } | |
7156 | if (prev_root) { | |
7157 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
7158 | kfree(prev_root); | |
7159 | } | |
7160 | return 0; | |
7161 | } | |
7162 | ||
7163 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
7164 | { | |
7165 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
7166 | return 0; | |
7167 | } | |
7168 | ||
7169 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
7170 | { | |
7171 | struct btrfs_root *reloc_root; | |
7172 | struct btrfs_trans_handle *trans; | |
7173 | struct btrfs_key location; | |
7174 | int found; | |
7175 | int ret; | |
7176 | ||
7177 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
7178 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
7179 | BUG_ON(ret); | |
7180 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
7181 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
7182 | ||
7183 | if (found) { | |
7184 | trans = btrfs_start_transaction(root, 1); | |
7185 | BUG_ON(!trans); | |
7186 | ret = btrfs_commit_transaction(trans, root); | |
7187 | BUG_ON(ret); | |
7188 | } | |
7189 | ||
7190 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
7191 | location.offset = (u64)-1; | |
7192 | location.type = BTRFS_ROOT_ITEM_KEY; | |
7193 | ||
7194 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
7195 | BUG_ON(!reloc_root); | |
7196 | btrfs_orphan_cleanup(reloc_root); | |
7197 | return 0; | |
7198 | } | |
7199 | ||
d397712b | 7200 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7201 | struct btrfs_root *root) |
7202 | { | |
7203 | struct btrfs_root *reloc_root; | |
7204 | struct extent_buffer *eb; | |
7205 | struct btrfs_root_item *root_item; | |
7206 | struct btrfs_key root_key; | |
7207 | int ret; | |
7208 | ||
7209 | BUG_ON(!root->ref_cows); | |
7210 | if (root->reloc_root) | |
7211 | return 0; | |
7212 | ||
7213 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
7214 | BUG_ON(!root_item); | |
7215 | ||
7216 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
7217 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
7218 | BUG_ON(ret); | |
7219 | ||
7220 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
7221 | root_key.offset = root->root_key.objectid; | |
7222 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
7223 | ||
7224 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
7225 | btrfs_set_root_refs(root_item, 0); | |
7226 | btrfs_set_root_bytenr(root_item, eb->start); | |
7227 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 7228 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
7229 | |
7230 | btrfs_tree_unlock(eb); | |
7231 | free_extent_buffer(eb); | |
7232 | ||
7233 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
7234 | &root_key, root_item); | |
7235 | BUG_ON(ret); | |
7236 | kfree(root_item); | |
7237 | ||
7238 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
7239 | &root_key); | |
7240 | BUG_ON(!reloc_root); | |
7241 | reloc_root->last_trans = trans->transid; | |
7242 | reloc_root->commit_root = NULL; | |
7243 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
7244 | ||
7245 | root->reloc_root = reloc_root; | |
7246 | return 0; | |
7247 | } | |
7248 | ||
7249 | /* | |
7250 | * Core function of space balance. | |
7251 | * | |
7252 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
7253 | * counted roots. There is one reloc tree for each subvol, and all |
7254 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
7255 | * of the latest committed roots of subvols (root->commit_root). | |
7256 | * | |
7257 | * To relocate a tree block referenced by a subvol, there are two steps. | |
7258 | * COW the block through subvol's reloc tree, then update block pointer | |
7259 | * in the subvol to point to the new block. Since all reloc trees share | |
7260 | * same root key objectid, doing special handing for tree blocks owned | |
7261 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
7262 | * we can use the resulting new block directly when the same block is | |
7263 | * required to COW again through other reloc trees. By this way, relocated | |
7264 | * tree blocks are shared between reloc trees, so they are also shared | |
7265 | * between subvols. | |
1a40e23b | 7266 | */ |
d397712b | 7267 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7268 | struct btrfs_root *root, |
7269 | struct btrfs_path *path, | |
7270 | struct btrfs_key *first_key, | |
7271 | struct btrfs_ref_path *ref_path, | |
7272 | struct btrfs_block_group_cache *group, | |
7273 | struct inode *reloc_inode) | |
7274 | { | |
7275 | struct btrfs_root *reloc_root; | |
7276 | struct extent_buffer *eb = NULL; | |
7277 | struct btrfs_key *keys; | |
7278 | u64 *nodes; | |
7279 | int level; | |
f82d02d9 | 7280 | int shared_level; |
1a40e23b | 7281 | int lowest_level = 0; |
1a40e23b ZY |
7282 | int ret; |
7283 | ||
7284 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
7285 | lowest_level = ref_path->owner_objectid; | |
7286 | ||
f82d02d9 | 7287 | if (!root->ref_cows) { |
1a40e23b ZY |
7288 | path->lowest_level = lowest_level; |
7289 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
7290 | BUG_ON(ret < 0); | |
7291 | path->lowest_level = 0; | |
7292 | btrfs_release_path(root, path); | |
7293 | return 0; | |
7294 | } | |
7295 | ||
1a40e23b ZY |
7296 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
7297 | ret = init_reloc_tree(trans, root); | |
7298 | BUG_ON(ret); | |
7299 | reloc_root = root->reloc_root; | |
7300 | ||
f82d02d9 YZ |
7301 | shared_level = ref_path->shared_level; |
7302 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 7303 | |
f82d02d9 YZ |
7304 | keys = ref_path->node_keys; |
7305 | nodes = ref_path->new_nodes; | |
7306 | memset(&keys[shared_level + 1], 0, | |
7307 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
7308 | memset(&nodes[shared_level + 1], 0, | |
7309 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 7310 | |
f82d02d9 YZ |
7311 | if (nodes[lowest_level] == 0) { |
7312 | path->lowest_level = lowest_level; | |
7313 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
7314 | 0, 1); | |
7315 | BUG_ON(ret); | |
7316 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
7317 | eb = path->nodes[level]; | |
7318 | if (!eb || eb == reloc_root->node) | |
7319 | break; | |
7320 | nodes[level] = eb->start; | |
7321 | if (level == 0) | |
7322 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
7323 | else | |
7324 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
7325 | } | |
2b82032c YZ |
7326 | if (nodes[0] && |
7327 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
7328 | eb = path->nodes[0]; |
7329 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
7330 | group, reloc_inode); | |
7331 | BUG_ON(ret); | |
7332 | } | |
7333 | btrfs_release_path(reloc_root, path); | |
7334 | } else { | |
1a40e23b | 7335 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 7336 | lowest_level); |
1a40e23b ZY |
7337 | BUG_ON(ret); |
7338 | } | |
7339 | ||
1a40e23b ZY |
7340 | /* |
7341 | * replace tree blocks in the fs tree with tree blocks in | |
7342 | * the reloc tree. | |
7343 | */ | |
7344 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
7345 | BUG_ON(ret < 0); | |
7346 | ||
7347 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
7348 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
7349 | 0, 0); | |
7350 | BUG_ON(ret); | |
7351 | extent_buffer_get(path->nodes[0]); | |
7352 | eb = path->nodes[0]; | |
7353 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
7354 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
7355 | BUG_ON(ret); | |
7356 | free_extent_buffer(eb); | |
7357 | } | |
1a40e23b | 7358 | |
f82d02d9 | 7359 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 7360 | path->lowest_level = 0; |
1a40e23b ZY |
7361 | return 0; |
7362 | } | |
7363 | ||
d397712b | 7364 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7365 | struct btrfs_root *root, |
7366 | struct btrfs_path *path, | |
7367 | struct btrfs_key *first_key, | |
7368 | struct btrfs_ref_path *ref_path) | |
7369 | { | |
7370 | int ret; | |
1a40e23b ZY |
7371 | |
7372 | ret = relocate_one_path(trans, root, path, first_key, | |
7373 | ref_path, NULL, NULL); | |
7374 | BUG_ON(ret); | |
7375 | ||
1a40e23b ZY |
7376 | return 0; |
7377 | } | |
7378 | ||
d397712b | 7379 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
7380 | struct btrfs_root *extent_root, |
7381 | struct btrfs_path *path, | |
7382 | struct btrfs_key *extent_key) | |
7383 | { | |
7384 | int ret; | |
7385 | ||
1a40e23b ZY |
7386 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
7387 | if (ret) | |
7388 | goto out; | |
7389 | ret = btrfs_del_item(trans, extent_root, path); | |
7390 | out: | |
7391 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
7392 | return ret; |
7393 | } | |
7394 | ||
d397712b | 7395 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
7396 | struct btrfs_ref_path *ref_path) |
7397 | { | |
7398 | struct btrfs_key root_key; | |
7399 | ||
7400 | root_key.objectid = ref_path->root_objectid; | |
7401 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
7402 | if (is_cowonly_root(ref_path->root_objectid)) | |
7403 | root_key.offset = 0; | |
7404 | else | |
7405 | root_key.offset = (u64)-1; | |
7406 | ||
7407 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
7408 | } | |
7409 | ||
d397712b | 7410 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
1a40e23b ZY |
7411 | struct btrfs_path *path, |
7412 | struct btrfs_key *extent_key, | |
7413 | struct btrfs_block_group_cache *group, | |
7414 | struct inode *reloc_inode, int pass) | |
7415 | { | |
7416 | struct btrfs_trans_handle *trans; | |
7417 | struct btrfs_root *found_root; | |
7418 | struct btrfs_ref_path *ref_path = NULL; | |
7419 | struct disk_extent *new_extents = NULL; | |
7420 | int nr_extents = 0; | |
7421 | int loops; | |
7422 | int ret; | |
7423 | int level; | |
7424 | struct btrfs_key first_key; | |
7425 | u64 prev_block = 0; | |
7426 | ||
1a40e23b ZY |
7427 | |
7428 | trans = btrfs_start_transaction(extent_root, 1); | |
7429 | BUG_ON(!trans); | |
7430 | ||
7431 | if (extent_key->objectid == 0) { | |
7432 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
7433 | goto out; | |
7434 | } | |
7435 | ||
7436 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
7437 | if (!ref_path) { | |
d397712b CM |
7438 | ret = -ENOMEM; |
7439 | goto out; | |
1a40e23b ZY |
7440 | } |
7441 | ||
7442 | for (loops = 0; ; loops++) { | |
7443 | if (loops == 0) { | |
7444 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
7445 | extent_key->objectid); | |
7446 | } else { | |
7447 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
7448 | } | |
7449 | if (ret < 0) | |
7450 | goto out; | |
7451 | if (ret > 0) | |
7452 | break; | |
7453 | ||
7454 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
7455 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
7456 | continue; | |
7457 | ||
7458 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
7459 | BUG_ON(!found_root); | |
7460 | /* | |
7461 | * for reference counted tree, only process reference paths | |
7462 | * rooted at the latest committed root. | |
7463 | */ | |
7464 | if (found_root->ref_cows && | |
7465 | ref_path->root_generation != found_root->root_key.offset) | |
7466 | continue; | |
7467 | ||
7468 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
7469 | if (pass == 0) { | |
7470 | /* | |
7471 | * copy data extents to new locations | |
7472 | */ | |
7473 | u64 group_start = group->key.objectid; | |
7474 | ret = relocate_data_extent(reloc_inode, | |
7475 | extent_key, | |
7476 | group_start); | |
7477 | if (ret < 0) | |
7478 | goto out; | |
7479 | break; | |
7480 | } | |
7481 | level = 0; | |
7482 | } else { | |
7483 | level = ref_path->owner_objectid; | |
7484 | } | |
7485 | ||
7486 | if (prev_block != ref_path->nodes[level]) { | |
7487 | struct extent_buffer *eb; | |
7488 | u64 block_start = ref_path->nodes[level]; | |
7489 | u64 block_size = btrfs_level_size(found_root, level); | |
7490 | ||
7491 | eb = read_tree_block(found_root, block_start, | |
7492 | block_size, 0); | |
7493 | btrfs_tree_lock(eb); | |
7494 | BUG_ON(level != btrfs_header_level(eb)); | |
7495 | ||
7496 | if (level == 0) | |
7497 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
7498 | else | |
7499 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
7500 | ||
7501 | btrfs_tree_unlock(eb); | |
7502 | free_extent_buffer(eb); | |
7503 | prev_block = block_start; | |
7504 | } | |
7505 | ||
24562425 | 7506 | mutex_lock(&extent_root->fs_info->trans_mutex); |
e4404d6e | 7507 | btrfs_record_root_in_trans(found_root); |
24562425 | 7508 | mutex_unlock(&extent_root->fs_info->trans_mutex); |
e4404d6e YZ |
7509 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
7510 | /* | |
7511 | * try to update data extent references while | |
7512 | * keeping metadata shared between snapshots. | |
7513 | */ | |
7514 | if (pass == 1) { | |
7515 | ret = relocate_one_path(trans, found_root, | |
7516 | path, &first_key, ref_path, | |
7517 | group, reloc_inode); | |
7518 | if (ret < 0) | |
7519 | goto out; | |
7520 | continue; | |
7521 | } | |
1a40e23b ZY |
7522 | /* |
7523 | * use fallback method to process the remaining | |
7524 | * references. | |
7525 | */ | |
7526 | if (!new_extents) { | |
7527 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
7528 | new_extents = kmalloc(sizeof(*new_extents), |
7529 | GFP_NOFS); | |
7530 | nr_extents = 1; | |
1a40e23b ZY |
7531 | ret = get_new_locations(reloc_inode, |
7532 | extent_key, | |
d899e052 | 7533 | group_start, 1, |
1a40e23b ZY |
7534 | &new_extents, |
7535 | &nr_extents); | |
d899e052 | 7536 | if (ret) |
1a40e23b ZY |
7537 | goto out; |
7538 | } | |
1a40e23b ZY |
7539 | ret = replace_one_extent(trans, found_root, |
7540 | path, extent_key, | |
7541 | &first_key, ref_path, | |
7542 | new_extents, nr_extents); | |
e4404d6e | 7543 | } else { |
1a40e23b ZY |
7544 | ret = relocate_tree_block(trans, found_root, path, |
7545 | &first_key, ref_path); | |
1a40e23b ZY |
7546 | } |
7547 | if (ret < 0) | |
7548 | goto out; | |
7549 | } | |
7550 | ret = 0; | |
7551 | out: | |
7552 | btrfs_end_transaction(trans, extent_root); | |
7553 | kfree(new_extents); | |
7554 | kfree(ref_path); | |
1a40e23b ZY |
7555 | return ret; |
7556 | } | |
5d4f98a2 | 7557 | #endif |
1a40e23b | 7558 | |
ec44a35c CM |
7559 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7560 | { | |
7561 | u64 num_devices; | |
7562 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
7563 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
7564 | ||
2b82032c | 7565 | num_devices = root->fs_info->fs_devices->rw_devices; |
ec44a35c CM |
7566 | if (num_devices == 1) { |
7567 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7568 | stripped = flags & ~stripped; | |
7569 | ||
7570 | /* turn raid0 into single device chunks */ | |
7571 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7572 | return stripped; | |
7573 | ||
7574 | /* turn mirroring into duplication */ | |
7575 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7576 | BTRFS_BLOCK_GROUP_RAID10)) | |
7577 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
7578 | return flags; | |
7579 | } else { | |
7580 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7581 | if (flags & stripped) |
7582 | return flags; | |
7583 | ||
7584 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7585 | stripped = flags & ~stripped; | |
7586 | ||
7587 | /* switch duplicated blocks with raid1 */ | |
7588 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7589 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7590 | ||
7591 | /* turn single device chunks into raid0 */ | |
7592 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
7593 | } | |
7594 | return flags; | |
7595 | } | |
7596 | ||
f0486c68 | 7597 | static int set_block_group_ro(struct btrfs_block_group_cache *cache) |
0ef3e66b | 7598 | { |
f0486c68 YZ |
7599 | struct btrfs_space_info *sinfo = cache->space_info; |
7600 | u64 num_bytes; | |
7601 | int ret = -ENOSPC; | |
0ef3e66b | 7602 | |
f0486c68 YZ |
7603 | if (cache->ro) |
7604 | return 0; | |
c286ac48 | 7605 | |
f0486c68 YZ |
7606 | spin_lock(&sinfo->lock); |
7607 | spin_lock(&cache->lock); | |
7608 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7609 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7610 | ||
7611 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
7612 | sinfo->bytes_may_use + sinfo->bytes_readonly + | |
7613 | cache->reserved_pinned + num_bytes < sinfo->total_bytes) { | |
7614 | sinfo->bytes_readonly += num_bytes; | |
7615 | sinfo->bytes_reserved += cache->reserved_pinned; | |
7616 | cache->reserved_pinned = 0; | |
7617 | cache->ro = 1; | |
7618 | ret = 0; | |
7619 | } | |
7620 | spin_unlock(&cache->lock); | |
7621 | spin_unlock(&sinfo->lock); | |
7622 | return ret; | |
7623 | } | |
7d9eb12c | 7624 | |
f0486c68 YZ |
7625 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7626 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7627 | |
f0486c68 YZ |
7628 | { |
7629 | struct btrfs_trans_handle *trans; | |
7630 | u64 alloc_flags; | |
7631 | int ret; | |
7d9eb12c | 7632 | |
f0486c68 | 7633 | BUG_ON(cache->ro); |
0ef3e66b | 7634 | |
f0486c68 YZ |
7635 | trans = btrfs_join_transaction(root, 1); |
7636 | BUG_ON(IS_ERR(trans)); | |
5d4f98a2 | 7637 | |
f0486c68 YZ |
7638 | alloc_flags = update_block_group_flags(root, cache->flags); |
7639 | if (alloc_flags != cache->flags) | |
7640 | do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); | |
5d4f98a2 | 7641 | |
f0486c68 YZ |
7642 | ret = set_block_group_ro(cache); |
7643 | if (!ret) | |
7644 | goto out; | |
7645 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
7646 | ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); | |
7647 | if (ret < 0) | |
7648 | goto out; | |
7649 | ret = set_block_group_ro(cache); | |
7650 | out: | |
7651 | btrfs_end_transaction(trans, root); | |
7652 | return ret; | |
7653 | } | |
7654 | ||
7655 | int btrfs_set_block_group_rw(struct btrfs_root *root, | |
7656 | struct btrfs_block_group_cache *cache) | |
5d4f98a2 | 7657 | { |
f0486c68 YZ |
7658 | struct btrfs_space_info *sinfo = cache->space_info; |
7659 | u64 num_bytes; | |
7660 | ||
7661 | BUG_ON(!cache->ro); | |
7662 | ||
7663 | spin_lock(&sinfo->lock); | |
7664 | spin_lock(&cache->lock); | |
7665 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7666 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7667 | sinfo->bytes_readonly -= num_bytes; | |
7668 | cache->ro = 0; | |
7669 | spin_unlock(&cache->lock); | |
7670 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
7671 | return 0; |
7672 | } | |
7673 | ||
ba1bf481 JB |
7674 | /* |
7675 | * checks to see if its even possible to relocate this block group. | |
7676 | * | |
7677 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
7678 | * ok to go ahead and try. | |
7679 | */ | |
7680 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 7681 | { |
ba1bf481 JB |
7682 | struct btrfs_block_group_cache *block_group; |
7683 | struct btrfs_space_info *space_info; | |
7684 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
7685 | struct btrfs_device *device; | |
7686 | int full = 0; | |
7687 | int ret = 0; | |
1a40e23b | 7688 | |
ba1bf481 | 7689 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 7690 | |
ba1bf481 JB |
7691 | /* odd, couldn't find the block group, leave it alone */ |
7692 | if (!block_group) | |
7693 | return -1; | |
1a40e23b | 7694 | |
ba1bf481 JB |
7695 | /* no bytes used, we're good */ |
7696 | if (!btrfs_block_group_used(&block_group->item)) | |
1a40e23b ZY |
7697 | goto out; |
7698 | ||
ba1bf481 JB |
7699 | space_info = block_group->space_info; |
7700 | spin_lock(&space_info->lock); | |
17d217fe | 7701 | |
ba1bf481 | 7702 | full = space_info->full; |
17d217fe | 7703 | |
ba1bf481 JB |
7704 | /* |
7705 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
7706 | * relocate it unless we're able to allocate a new chunk below. |
7707 | * | |
7708 | * Otherwise, we need to make sure we have room in the space to handle | |
7709 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 7710 | */ |
7ce618db CM |
7711 | if ((space_info->total_bytes != block_group->key.offset) && |
7712 | (space_info->bytes_used + space_info->bytes_reserved + | |
ba1bf481 JB |
7713 | space_info->bytes_pinned + space_info->bytes_readonly + |
7714 | btrfs_block_group_used(&block_group->item) < | |
7ce618db | 7715 | space_info->total_bytes)) { |
ba1bf481 JB |
7716 | spin_unlock(&space_info->lock); |
7717 | goto out; | |
17d217fe | 7718 | } |
ba1bf481 | 7719 | spin_unlock(&space_info->lock); |
ea8c2819 | 7720 | |
ba1bf481 JB |
7721 | /* |
7722 | * ok we don't have enough space, but maybe we have free space on our | |
7723 | * devices to allocate new chunks for relocation, so loop through our | |
7724 | * alloc devices and guess if we have enough space. However, if we | |
7725 | * were marked as full, then we know there aren't enough chunks, and we | |
7726 | * can just return. | |
7727 | */ | |
7728 | ret = -1; | |
7729 | if (full) | |
7730 | goto out; | |
ea8c2819 | 7731 | |
ba1bf481 JB |
7732 | mutex_lock(&root->fs_info->chunk_mutex); |
7733 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7734 | u64 min_free = btrfs_block_group_used(&block_group->item); | |
7735 | u64 dev_offset, max_avail; | |
56bec294 | 7736 | |
ba1bf481 JB |
7737 | /* |
7738 | * check to make sure we can actually find a chunk with enough | |
7739 | * space to fit our block group in. | |
7740 | */ | |
7741 | if (device->total_bytes > device->bytes_used + min_free) { | |
7742 | ret = find_free_dev_extent(NULL, device, min_free, | |
7743 | &dev_offset, &max_avail); | |
7744 | if (!ret) | |
73e48b27 | 7745 | break; |
ba1bf481 | 7746 | ret = -1; |
725c8463 | 7747 | } |
edbd8d4e | 7748 | } |
ba1bf481 | 7749 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 7750 | out: |
ba1bf481 | 7751 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
7752 | return ret; |
7753 | } | |
7754 | ||
b2950863 CH |
7755 | static int find_first_block_group(struct btrfs_root *root, |
7756 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 7757 | { |
925baedd | 7758 | int ret = 0; |
0b86a832 CM |
7759 | struct btrfs_key found_key; |
7760 | struct extent_buffer *leaf; | |
7761 | int slot; | |
edbd8d4e | 7762 | |
0b86a832 CM |
7763 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
7764 | if (ret < 0) | |
925baedd CM |
7765 | goto out; |
7766 | ||
d397712b | 7767 | while (1) { |
0b86a832 | 7768 | slot = path->slots[0]; |
edbd8d4e | 7769 | leaf = path->nodes[0]; |
0b86a832 CM |
7770 | if (slot >= btrfs_header_nritems(leaf)) { |
7771 | ret = btrfs_next_leaf(root, path); | |
7772 | if (ret == 0) | |
7773 | continue; | |
7774 | if (ret < 0) | |
925baedd | 7775 | goto out; |
0b86a832 | 7776 | break; |
edbd8d4e | 7777 | } |
0b86a832 | 7778 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 7779 | |
0b86a832 | 7780 | if (found_key.objectid >= key->objectid && |
925baedd CM |
7781 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
7782 | ret = 0; | |
7783 | goto out; | |
7784 | } | |
0b86a832 | 7785 | path->slots[0]++; |
edbd8d4e | 7786 | } |
925baedd | 7787 | out: |
0b86a832 | 7788 | return ret; |
edbd8d4e CM |
7789 | } |
7790 | ||
1a40e23b ZY |
7791 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
7792 | { | |
7793 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 7794 | struct btrfs_space_info *space_info; |
11833d66 | 7795 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
7796 | struct rb_node *n; |
7797 | ||
11833d66 YZ |
7798 | down_write(&info->extent_commit_sem); |
7799 | while (!list_empty(&info->caching_block_groups)) { | |
7800 | caching_ctl = list_entry(info->caching_block_groups.next, | |
7801 | struct btrfs_caching_control, list); | |
7802 | list_del(&caching_ctl->list); | |
7803 | put_caching_control(caching_ctl); | |
7804 | } | |
7805 | up_write(&info->extent_commit_sem); | |
7806 | ||
1a40e23b ZY |
7807 | spin_lock(&info->block_group_cache_lock); |
7808 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
7809 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
7810 | cache_node); | |
1a40e23b ZY |
7811 | rb_erase(&block_group->cache_node, |
7812 | &info->block_group_cache_tree); | |
d899e052 YZ |
7813 | spin_unlock(&info->block_group_cache_lock); |
7814 | ||
80eb234a | 7815 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 7816 | list_del(&block_group->list); |
80eb234a | 7817 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 7818 | |
817d52f8 | 7819 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7820 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
7821 | |
7822 | btrfs_remove_free_space_cache(block_group); | |
11dfe35a | 7823 | btrfs_put_block_group(block_group); |
d899e052 YZ |
7824 | |
7825 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
7826 | } |
7827 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
7828 | |
7829 | /* now that all the block groups are freed, go through and | |
7830 | * free all the space_info structs. This is only called during | |
7831 | * the final stages of unmount, and so we know nobody is | |
7832 | * using them. We call synchronize_rcu() once before we start, | |
7833 | * just to be on the safe side. | |
7834 | */ | |
7835 | synchronize_rcu(); | |
7836 | ||
8929ecfa YZ |
7837 | release_global_block_rsv(info); |
7838 | ||
4184ea7f CM |
7839 | while(!list_empty(&info->space_info)) { |
7840 | space_info = list_entry(info->space_info.next, | |
7841 | struct btrfs_space_info, | |
7842 | list); | |
f0486c68 YZ |
7843 | if (space_info->bytes_pinned > 0 || |
7844 | space_info->bytes_reserved > 0) { | |
7845 | WARN_ON(1); | |
7846 | dump_space_info(space_info, 0, 0); | |
7847 | } | |
4184ea7f CM |
7848 | list_del(&space_info->list); |
7849 | kfree(space_info); | |
7850 | } | |
1a40e23b ZY |
7851 | return 0; |
7852 | } | |
7853 | ||
b742bb82 YZ |
7854 | static void __link_block_group(struct btrfs_space_info *space_info, |
7855 | struct btrfs_block_group_cache *cache) | |
7856 | { | |
7857 | int index = get_block_group_index(cache); | |
7858 | ||
7859 | down_write(&space_info->groups_sem); | |
7860 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
7861 | up_write(&space_info->groups_sem); | |
7862 | } | |
7863 | ||
9078a3e1 CM |
7864 | int btrfs_read_block_groups(struct btrfs_root *root) |
7865 | { | |
7866 | struct btrfs_path *path; | |
7867 | int ret; | |
9078a3e1 | 7868 | struct btrfs_block_group_cache *cache; |
be744175 | 7869 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 7870 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
7871 | struct btrfs_key key; |
7872 | struct btrfs_key found_key; | |
5f39d397 | 7873 | struct extent_buffer *leaf; |
96b5179d | 7874 | |
be744175 | 7875 | root = info->extent_root; |
9078a3e1 | 7876 | key.objectid = 0; |
0b86a832 | 7877 | key.offset = 0; |
9078a3e1 | 7878 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
7879 | path = btrfs_alloc_path(); |
7880 | if (!path) | |
7881 | return -ENOMEM; | |
7882 | ||
d397712b | 7883 | while (1) { |
0b86a832 | 7884 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
7885 | if (ret > 0) |
7886 | break; | |
0b86a832 CM |
7887 | if (ret != 0) |
7888 | goto error; | |
7889 | ||
5f39d397 CM |
7890 | leaf = path->nodes[0]; |
7891 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 7892 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 7893 | if (!cache) { |
0b86a832 | 7894 | ret = -ENOMEM; |
f0486c68 | 7895 | goto error; |
9078a3e1 | 7896 | } |
3e1ad54f | 7897 | |
d2fb3437 | 7898 | atomic_set(&cache->count, 1); |
c286ac48 | 7899 | spin_lock_init(&cache->lock); |
6226cb0a | 7900 | spin_lock_init(&cache->tree_lock); |
817d52f8 | 7901 | cache->fs_info = info; |
0f9dd46c | 7902 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7903 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 JB |
7904 | |
7905 | /* | |
7906 | * we only want to have 32k of ram per block group for keeping | |
7907 | * track of free space, and if we pass 1/2 of that we want to | |
7908 | * start converting things over to using bitmaps | |
7909 | */ | |
7910 | cache->extents_thresh = ((1024 * 32) / 2) / | |
7911 | sizeof(struct btrfs_free_space); | |
7912 | ||
5f39d397 CM |
7913 | read_extent_buffer(leaf, &cache->item, |
7914 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
7915 | sizeof(cache->item)); | |
9078a3e1 | 7916 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 7917 | |
9078a3e1 CM |
7918 | key.objectid = found_key.objectid + found_key.offset; |
7919 | btrfs_release_path(root, path); | |
0b86a832 | 7920 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
7921 | cache->sectorsize = root->sectorsize; |
7922 | ||
817d52f8 JB |
7923 | /* |
7924 | * check for two cases, either we are full, and therefore | |
7925 | * don't need to bother with the caching work since we won't | |
7926 | * find any space, or we are empty, and we can just add all | |
7927 | * the space in and be done with it. This saves us _alot_ of | |
7928 | * time, particularly in the full case. | |
7929 | */ | |
7930 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
1b2da372 | 7931 | exclude_super_stripes(root, cache); |
11833d66 | 7932 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7933 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 7934 | free_excluded_extents(root, cache); |
817d52f8 | 7935 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 YZ |
7936 | exclude_super_stripes(root, cache); |
7937 | cache->last_byte_to_unpin = (u64)-1; | |
817d52f8 JB |
7938 | cache->cached = BTRFS_CACHE_FINISHED; |
7939 | add_new_free_space(cache, root->fs_info, | |
7940 | found_key.objectid, | |
7941 | found_key.objectid + | |
7942 | found_key.offset); | |
11833d66 | 7943 | free_excluded_extents(root, cache); |
817d52f8 | 7944 | } |
96b5179d | 7945 | |
6324fbf3 CM |
7946 | ret = update_space_info(info, cache->flags, found_key.offset, |
7947 | btrfs_block_group_used(&cache->item), | |
7948 | &space_info); | |
7949 | BUG_ON(ret); | |
7950 | cache->space_info = space_info; | |
1b2da372 | 7951 | spin_lock(&cache->space_info->lock); |
f0486c68 | 7952 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7953 | spin_unlock(&cache->space_info->lock); |
7954 | ||
b742bb82 | 7955 | __link_block_group(space_info, cache); |
0f9dd46c JB |
7956 | |
7957 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
7958 | BUG_ON(ret); | |
75ccf47d CM |
7959 | |
7960 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 7961 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
f0486c68 | 7962 | set_block_group_ro(cache); |
9078a3e1 | 7963 | } |
b742bb82 YZ |
7964 | |
7965 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
7966 | if (!(get_alloc_profile(root, space_info->flags) & | |
7967 | (BTRFS_BLOCK_GROUP_RAID10 | | |
7968 | BTRFS_BLOCK_GROUP_RAID1 | | |
7969 | BTRFS_BLOCK_GROUP_DUP))) | |
7970 | continue; | |
7971 | /* | |
7972 | * avoid allocating from un-mirrored block group if there are | |
7973 | * mirrored block groups. | |
7974 | */ | |
7975 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
f0486c68 | 7976 | set_block_group_ro(cache); |
b742bb82 | 7977 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
f0486c68 | 7978 | set_block_group_ro(cache); |
b742bb82 | 7979 | } |
f0486c68 YZ |
7980 | |
7981 | init_global_block_rsv(info); | |
0b86a832 CM |
7982 | ret = 0; |
7983 | error: | |
9078a3e1 | 7984 | btrfs_free_path(path); |
0b86a832 | 7985 | return ret; |
9078a3e1 | 7986 | } |
6324fbf3 CM |
7987 | |
7988 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
7989 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 7990 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
7991 | u64 size) |
7992 | { | |
7993 | int ret; | |
6324fbf3 CM |
7994 | struct btrfs_root *extent_root; |
7995 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
7996 | |
7997 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 7998 | |
12fcfd22 | 7999 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8000 | |
8f18cf13 | 8001 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8002 | if (!cache) |
8003 | return -ENOMEM; | |
8004 | ||
e17cade2 | 8005 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8006 | cache->key.offset = size; |
d2fb3437 | 8007 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 JB |
8008 | cache->sectorsize = root->sectorsize; |
8009 | ||
8010 | /* | |
8011 | * we only want to have 32k of ram per block group for keeping track | |
8012 | * of free space, and if we pass 1/2 of that we want to start | |
8013 | * converting things over to using bitmaps | |
8014 | */ | |
8015 | cache->extents_thresh = ((1024 * 32) / 2) / | |
8016 | sizeof(struct btrfs_free_space); | |
d2fb3437 | 8017 | atomic_set(&cache->count, 1); |
c286ac48 | 8018 | spin_lock_init(&cache->lock); |
6226cb0a | 8019 | spin_lock_init(&cache->tree_lock); |
0f9dd46c | 8020 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8021 | INIT_LIST_HEAD(&cache->cluster_list); |
0ef3e66b | 8022 | |
6324fbf3 | 8023 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8024 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8025 | cache->flags = type; | |
8026 | btrfs_set_block_group_flags(&cache->item, type); | |
8027 | ||
11833d66 | 8028 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8029 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 8030 | exclude_super_stripes(root, cache); |
96303081 | 8031 | |
817d52f8 JB |
8032 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8033 | chunk_offset + size); | |
8034 | ||
11833d66 YZ |
8035 | free_excluded_extents(root, cache); |
8036 | ||
6324fbf3 CM |
8037 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8038 | &cache->space_info); | |
8039 | BUG_ON(ret); | |
1b2da372 JB |
8040 | |
8041 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8042 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8043 | spin_unlock(&cache->space_info->lock); |
8044 | ||
b742bb82 | 8045 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8046 | |
0f9dd46c JB |
8047 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8048 | BUG_ON(ret); | |
c286ac48 | 8049 | |
6324fbf3 CM |
8050 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
8051 | sizeof(cache->item)); | |
8052 | BUG_ON(ret); | |
8053 | ||
d18a2c44 | 8054 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8055 | |
6324fbf3 CM |
8056 | return 0; |
8057 | } | |
1a40e23b ZY |
8058 | |
8059 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
8060 | struct btrfs_root *root, u64 group_start) | |
8061 | { | |
8062 | struct btrfs_path *path; | |
8063 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8064 | struct btrfs_free_cluster *cluster; |
1a40e23b ZY |
8065 | struct btrfs_key key; |
8066 | int ret; | |
8067 | ||
1a40e23b ZY |
8068 | root = root->fs_info->extent_root; |
8069 | ||
8070 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8071 | BUG_ON(!block_group); | |
c146afad | 8072 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
8073 | |
8074 | memcpy(&key, &block_group->key, sizeof(key)); | |
8075 | ||
44fb5511 CM |
8076 | /* make sure this block group isn't part of an allocation cluster */ |
8077 | cluster = &root->fs_info->data_alloc_cluster; | |
8078 | spin_lock(&cluster->refill_lock); | |
8079 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8080 | spin_unlock(&cluster->refill_lock); | |
8081 | ||
8082 | /* | |
8083 | * make sure this block group isn't part of a metadata | |
8084 | * allocation cluster | |
8085 | */ | |
8086 | cluster = &root->fs_info->meta_alloc_cluster; | |
8087 | spin_lock(&cluster->refill_lock); | |
8088 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8089 | spin_unlock(&cluster->refill_lock); | |
8090 | ||
1a40e23b ZY |
8091 | path = btrfs_alloc_path(); |
8092 | BUG_ON(!path); | |
8093 | ||
3dfdb934 | 8094 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8095 | rb_erase(&block_group->cache_node, |
8096 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 | 8097 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8098 | |
80eb234a | 8099 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8100 | /* |
8101 | * we must use list_del_init so people can check to see if they | |
8102 | * are still on the list after taking the semaphore | |
8103 | */ | |
8104 | list_del_init(&block_group->list); | |
80eb234a | 8105 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8106 | |
817d52f8 | 8107 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8108 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8109 | |
8110 | btrfs_remove_free_space_cache(block_group); | |
8111 | ||
c146afad YZ |
8112 | spin_lock(&block_group->space_info->lock); |
8113 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8114 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
8115 | spin_unlock(&block_group->space_info->lock); | |
283bb197 CM |
8116 | |
8117 | btrfs_clear_space_info_full(root->fs_info); | |
c146afad | 8118 | |
fa9c0d79 CM |
8119 | btrfs_put_block_group(block_group); |
8120 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8121 | |
8122 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8123 | if (ret > 0) | |
8124 | ret = -EIO; | |
8125 | if (ret < 0) | |
8126 | goto out; | |
8127 | ||
8128 | ret = btrfs_del_item(trans, root, path); | |
8129 | out: | |
8130 | btrfs_free_path(path); | |
8131 | return ret; | |
8132 | } |