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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> |
4b4e25f2 | 24 | #include "compat.h" |
74493f7a | 25 | #include "hash.h" |
a5eb62e3 | 26 | #include "crc32c.h" |
fec577fb CM |
27 | #include "ctree.h" |
28 | #include "disk-io.h" | |
29 | #include "print-tree.h" | |
e089f05c | 30 | #include "transaction.h" |
0b86a832 | 31 | #include "volumes.h" |
925baedd | 32 | #include "locking.h" |
31153d81 | 33 | #include "ref-cache.h" |
fec577fb | 34 | |
31840ae1 ZY |
35 | #define PENDING_EXTENT_INSERT 0 |
36 | #define PENDING_EXTENT_DELETE 1 | |
37 | #define PENDING_BACKREF_UPDATE 2 | |
38 | ||
39 | struct pending_extent_op { | |
40 | int type; | |
41 | u64 bytenr; | |
42 | u64 num_bytes; | |
43 | u64 parent; | |
44 | u64 orig_parent; | |
45 | u64 generation; | |
46 | u64 orig_generation; | |
47 | int level; | |
f3465ca4 JB |
48 | struct list_head list; |
49 | int del; | |
31840ae1 ZY |
50 | }; |
51 | ||
56bec294 CM |
52 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, |
53 | struct btrfs_root *root, u64 parent, | |
54 | u64 root_objectid, u64 ref_generation, | |
55 | u64 owner, struct btrfs_key *ins, | |
56 | int ref_mod); | |
57 | static int update_reserved_extents(struct btrfs_root *root, | |
58 | u64 bytenr, u64 num, int reserve); | |
f3465ca4 JB |
59 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
60 | struct btrfs_root *root, | |
61 | u64 bytenr, u64 num_bytes, int is_data); | |
62 | static int update_block_group(struct btrfs_trans_handle *trans, | |
63 | struct btrfs_root *root, | |
64 | u64 bytenr, u64 num_bytes, int alloc, | |
65 | int mark_free); | |
56bec294 CM |
66 | static noinline int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
67 | struct btrfs_root *root, | |
68 | u64 bytenr, u64 num_bytes, u64 parent, | |
69 | u64 root_objectid, u64 ref_generation, | |
70 | u64 owner_objectid, int pin, | |
71 | int ref_to_drop); | |
d548ee51 | 72 | |
6a63209f JB |
73 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
74 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
75 | u64 flags, int force); | |
76 | ||
0f9dd46c JB |
77 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
78 | { | |
79 | return (cache->flags & bits) == bits; | |
80 | } | |
81 | ||
82 | /* | |
83 | * this adds the block group to the fs_info rb tree for the block group | |
84 | * cache | |
85 | */ | |
b2950863 | 86 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
87 | struct btrfs_block_group_cache *block_group) |
88 | { | |
89 | struct rb_node **p; | |
90 | struct rb_node *parent = NULL; | |
91 | struct btrfs_block_group_cache *cache; | |
92 | ||
93 | spin_lock(&info->block_group_cache_lock); | |
94 | p = &info->block_group_cache_tree.rb_node; | |
95 | ||
96 | while (*p) { | |
97 | parent = *p; | |
98 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
99 | cache_node); | |
100 | if (block_group->key.objectid < cache->key.objectid) { | |
101 | p = &(*p)->rb_left; | |
102 | } else if (block_group->key.objectid > cache->key.objectid) { | |
103 | p = &(*p)->rb_right; | |
104 | } else { | |
105 | spin_unlock(&info->block_group_cache_lock); | |
106 | return -EEXIST; | |
107 | } | |
108 | } | |
109 | ||
110 | rb_link_node(&block_group->cache_node, parent, p); | |
111 | rb_insert_color(&block_group->cache_node, | |
112 | &info->block_group_cache_tree); | |
113 | spin_unlock(&info->block_group_cache_lock); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | /* | |
119 | * This will return the block group at or after bytenr if contains is 0, else | |
120 | * it will return the block group that contains the bytenr | |
121 | */ | |
122 | static struct btrfs_block_group_cache * | |
123 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
124 | int contains) | |
125 | { | |
126 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
127 | struct rb_node *n; | |
128 | u64 end, start; | |
129 | ||
130 | spin_lock(&info->block_group_cache_lock); | |
131 | n = info->block_group_cache_tree.rb_node; | |
132 | ||
133 | while (n) { | |
134 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
135 | cache_node); | |
136 | end = cache->key.objectid + cache->key.offset - 1; | |
137 | start = cache->key.objectid; | |
138 | ||
139 | if (bytenr < start) { | |
140 | if (!contains && (!ret || start < ret->key.objectid)) | |
141 | ret = cache; | |
142 | n = n->rb_left; | |
143 | } else if (bytenr > start) { | |
144 | if (contains && bytenr <= end) { | |
145 | ret = cache; | |
146 | break; | |
147 | } | |
148 | n = n->rb_right; | |
149 | } else { | |
150 | ret = cache; | |
151 | break; | |
152 | } | |
153 | } | |
d2fb3437 YZ |
154 | if (ret) |
155 | atomic_inc(&ret->count); | |
0f9dd46c JB |
156 | spin_unlock(&info->block_group_cache_lock); |
157 | ||
158 | return ret; | |
159 | } | |
160 | ||
161 | /* | |
162 | * this is only called by cache_block_group, since we could have freed extents | |
163 | * we need to check the pinned_extents for any extents that can't be used yet | |
164 | * since their free space will be released as soon as the transaction commits. | |
165 | */ | |
166 | static int add_new_free_space(struct btrfs_block_group_cache *block_group, | |
167 | struct btrfs_fs_info *info, u64 start, u64 end) | |
168 | { | |
169 | u64 extent_start, extent_end, size; | |
170 | int ret; | |
171 | ||
25179201 | 172 | mutex_lock(&info->pinned_mutex); |
0f9dd46c JB |
173 | while (start < end) { |
174 | ret = find_first_extent_bit(&info->pinned_extents, start, | |
175 | &extent_start, &extent_end, | |
176 | EXTENT_DIRTY); | |
177 | if (ret) | |
178 | break; | |
179 | ||
180 | if (extent_start == start) { | |
181 | start = extent_end + 1; | |
182 | } else if (extent_start > start && extent_start < end) { | |
183 | size = extent_start - start; | |
ea6a478e JB |
184 | ret = btrfs_add_free_space(block_group, start, |
185 | size); | |
0f9dd46c JB |
186 | BUG_ON(ret); |
187 | start = extent_end + 1; | |
188 | } else { | |
189 | break; | |
190 | } | |
191 | } | |
192 | ||
193 | if (start < end) { | |
194 | size = end - start; | |
ea6a478e | 195 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
196 | BUG_ON(ret); |
197 | } | |
25179201 | 198 | mutex_unlock(&info->pinned_mutex); |
0f9dd46c JB |
199 | |
200 | return 0; | |
201 | } | |
202 | ||
a512bbf8 YZ |
203 | static int remove_sb_from_cache(struct btrfs_root *root, |
204 | struct btrfs_block_group_cache *cache) | |
205 | { | |
206 | u64 bytenr; | |
207 | u64 *logical; | |
208 | int stripe_len; | |
209 | int i, nr, ret; | |
210 | ||
211 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
212 | bytenr = btrfs_sb_offset(i); | |
213 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
214 | cache->key.objectid, bytenr, 0, | |
215 | &logical, &nr, &stripe_len); | |
216 | BUG_ON(ret); | |
217 | while (nr--) { | |
218 | btrfs_remove_free_space(cache, logical[nr], | |
219 | stripe_len); | |
220 | } | |
221 | kfree(logical); | |
222 | } | |
223 | return 0; | |
224 | } | |
225 | ||
e37c9e69 CM |
226 | static int cache_block_group(struct btrfs_root *root, |
227 | struct btrfs_block_group_cache *block_group) | |
228 | { | |
229 | struct btrfs_path *path; | |
ef8bbdfe | 230 | int ret = 0; |
e37c9e69 | 231 | struct btrfs_key key; |
5f39d397 | 232 | struct extent_buffer *leaf; |
e37c9e69 | 233 | int slot; |
e4404d6e | 234 | u64 last; |
e37c9e69 | 235 | |
00f5c795 CM |
236 | if (!block_group) |
237 | return 0; | |
238 | ||
e37c9e69 | 239 | root = root->fs_info->extent_root; |
e37c9e69 CM |
240 | |
241 | if (block_group->cached) | |
242 | return 0; | |
f510cfec | 243 | |
e37c9e69 CM |
244 | path = btrfs_alloc_path(); |
245 | if (!path) | |
246 | return -ENOMEM; | |
7d7d6068 | 247 | |
2cc58cf2 | 248 | path->reada = 2; |
5cd57b2c CM |
249 | /* |
250 | * we get into deadlocks with paths held by callers of this function. | |
251 | * since the alloc_mutex is protecting things right now, just | |
252 | * skip the locking here | |
253 | */ | |
254 | path->skip_locking = 1; | |
e4404d6e YZ |
255 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
256 | key.objectid = last; | |
e37c9e69 CM |
257 | key.offset = 0; |
258 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
259 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
260 | if (ret < 0) | |
ef8bbdfe | 261 | goto err; |
a512bbf8 | 262 | |
d397712b | 263 | while (1) { |
5f39d397 | 264 | leaf = path->nodes[0]; |
e37c9e69 | 265 | slot = path->slots[0]; |
5f39d397 | 266 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 267 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
268 | if (ret < 0) |
269 | goto err; | |
0f9dd46c | 270 | if (ret == 0) |
e37c9e69 | 271 | continue; |
0f9dd46c | 272 | else |
e37c9e69 | 273 | break; |
e37c9e69 | 274 | } |
5f39d397 | 275 | btrfs_item_key_to_cpu(leaf, &key, slot); |
0f9dd46c | 276 | if (key.objectid < block_group->key.objectid) |
7d7d6068 | 277 | goto next; |
0f9dd46c | 278 | |
e37c9e69 | 279 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 280 | block_group->key.offset) |
e37c9e69 | 281 | break; |
7d7d6068 | 282 | |
e37c9e69 | 283 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
0f9dd46c JB |
284 | add_new_free_space(block_group, root->fs_info, last, |
285 | key.objectid); | |
286 | ||
7d7d6068 | 287 | last = key.objectid + key.offset; |
e37c9e69 | 288 | } |
7d7d6068 | 289 | next: |
e37c9e69 CM |
290 | path->slots[0]++; |
291 | } | |
292 | ||
0f9dd46c JB |
293 | add_new_free_space(block_group, root->fs_info, last, |
294 | block_group->key.objectid + | |
295 | block_group->key.offset); | |
296 | ||
a512bbf8 | 297 | remove_sb_from_cache(root, block_group); |
e37c9e69 | 298 | block_group->cached = 1; |
ef8bbdfe | 299 | ret = 0; |
54aa1f4d | 300 | err: |
e37c9e69 | 301 | btrfs_free_path(path); |
ef8bbdfe | 302 | return ret; |
e37c9e69 CM |
303 | } |
304 | ||
0f9dd46c JB |
305 | /* |
306 | * return the block group that starts at or after bytenr | |
307 | */ | |
d397712b CM |
308 | static struct btrfs_block_group_cache * |
309 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 310 | { |
0f9dd46c | 311 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 312 | |
0f9dd46c | 313 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 314 | |
0f9dd46c | 315 | return cache; |
0ef3e66b CM |
316 | } |
317 | ||
0f9dd46c JB |
318 | /* |
319 | * return the block group that contains teh given bytenr | |
320 | */ | |
d397712b CM |
321 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
322 | struct btrfs_fs_info *info, | |
323 | u64 bytenr) | |
be744175 | 324 | { |
0f9dd46c | 325 | struct btrfs_block_group_cache *cache; |
be744175 | 326 | |
0f9dd46c | 327 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 328 | |
0f9dd46c | 329 | return cache; |
be744175 | 330 | } |
0b86a832 | 331 | |
d2fb3437 YZ |
332 | static inline void put_block_group(struct btrfs_block_group_cache *cache) |
333 | { | |
334 | if (atomic_dec_and_test(&cache->count)) | |
335 | kfree(cache); | |
336 | } | |
337 | ||
0f9dd46c JB |
338 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
339 | u64 flags) | |
6324fbf3 | 340 | { |
0f9dd46c | 341 | struct list_head *head = &info->space_info; |
0f9dd46c | 342 | struct btrfs_space_info *found; |
4184ea7f CM |
343 | |
344 | rcu_read_lock(); | |
345 | list_for_each_entry_rcu(found, head, list) { | |
346 | if (found->flags == flags) { | |
347 | rcu_read_unlock(); | |
0f9dd46c | 348 | return found; |
4184ea7f | 349 | } |
0f9dd46c | 350 | } |
4184ea7f | 351 | rcu_read_unlock(); |
0f9dd46c | 352 | return NULL; |
6324fbf3 CM |
353 | } |
354 | ||
4184ea7f CM |
355 | /* |
356 | * after adding space to the filesystem, we need to clear the full flags | |
357 | * on all the space infos. | |
358 | */ | |
359 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
360 | { | |
361 | struct list_head *head = &info->space_info; | |
362 | struct btrfs_space_info *found; | |
363 | ||
364 | rcu_read_lock(); | |
365 | list_for_each_entry_rcu(found, head, list) | |
366 | found->full = 0; | |
367 | rcu_read_unlock(); | |
368 | } | |
369 | ||
80eb234a JB |
370 | static u64 div_factor(u64 num, int factor) |
371 | { | |
372 | if (factor == 10) | |
373 | return num; | |
374 | num *= factor; | |
375 | do_div(num, 10); | |
376 | return num; | |
377 | } | |
378 | ||
d2fb3437 YZ |
379 | u64 btrfs_find_block_group(struct btrfs_root *root, |
380 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 381 | { |
96b5179d | 382 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 383 | u64 used; |
d2fb3437 YZ |
384 | u64 last = max(search_hint, search_start); |
385 | u64 group_start = 0; | |
31f3c99b | 386 | int full_search = 0; |
d2fb3437 | 387 | int factor = 9; |
0ef3e66b | 388 | int wrapped = 0; |
31f3c99b | 389 | again: |
e8569813 ZY |
390 | while (1) { |
391 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
392 | if (!cache) |
393 | break; | |
96b5179d | 394 | |
c286ac48 | 395 | spin_lock(&cache->lock); |
96b5179d CM |
396 | last = cache->key.objectid + cache->key.offset; |
397 | used = btrfs_block_group_used(&cache->item); | |
398 | ||
d2fb3437 YZ |
399 | if ((full_search || !cache->ro) && |
400 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 401 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
402 | div_factor(cache->key.offset, factor)) { |
403 | group_start = cache->key.objectid; | |
c286ac48 | 404 | spin_unlock(&cache->lock); |
d2fb3437 | 405 | put_block_group(cache); |
8790d502 CM |
406 | goto found; |
407 | } | |
6324fbf3 | 408 | } |
c286ac48 | 409 | spin_unlock(&cache->lock); |
d2fb3437 | 410 | put_block_group(cache); |
de428b63 | 411 | cond_resched(); |
cd1bc465 | 412 | } |
0ef3e66b CM |
413 | if (!wrapped) { |
414 | last = search_start; | |
415 | wrapped = 1; | |
416 | goto again; | |
417 | } | |
418 | if (!full_search && factor < 10) { | |
be744175 | 419 | last = search_start; |
31f3c99b | 420 | full_search = 1; |
0ef3e66b | 421 | factor = 10; |
31f3c99b CM |
422 | goto again; |
423 | } | |
be744175 | 424 | found: |
d2fb3437 | 425 | return group_start; |
925baedd | 426 | } |
0f9dd46c | 427 | |
e02119d5 | 428 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 429 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
430 | { |
431 | int ret; | |
432 | struct btrfs_key key; | |
31840ae1 | 433 | struct btrfs_path *path; |
e02119d5 | 434 | |
31840ae1 ZY |
435 | path = btrfs_alloc_path(); |
436 | BUG_ON(!path); | |
e02119d5 CM |
437 | key.objectid = start; |
438 | key.offset = len; | |
439 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
440 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
441 | 0, 0); | |
31840ae1 | 442 | btrfs_free_path(path); |
7bb86316 CM |
443 | return ret; |
444 | } | |
445 | ||
d8d5f3e1 CM |
446 | /* |
447 | * Back reference rules. Back refs have three main goals: | |
448 | * | |
449 | * 1) differentiate between all holders of references to an extent so that | |
450 | * when a reference is dropped we can make sure it was a valid reference | |
451 | * before freeing the extent. | |
452 | * | |
453 | * 2) Provide enough information to quickly find the holders of an extent | |
454 | * if we notice a given block is corrupted or bad. | |
455 | * | |
456 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
457 | * maintenance. This is actually the same as #2, but with a slightly | |
458 | * different use case. | |
459 | * | |
460 | * File extents can be referenced by: | |
461 | * | |
462 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 463 | * - different files inside a single subvolume |
d8d5f3e1 CM |
464 | * - different offsets inside a file (bookend extents in file.c) |
465 | * | |
466 | * The extent ref structure has fields for: | |
467 | * | |
468 | * - Objectid of the subvolume root | |
469 | * - Generation number of the tree holding the reference | |
470 | * - objectid of the file holding the reference | |
31840ae1 ZY |
471 | * - number of references holding by parent node (alway 1 for tree blocks) |
472 | * | |
473 | * Btree leaf may hold multiple references to a file extent. In most cases, | |
474 | * these references are from same file and the corresponding offsets inside | |
3bb1a1bc | 475 | * the file are close together. |
d8d5f3e1 CM |
476 | * |
477 | * When a file extent is allocated the fields are filled in: | |
3bb1a1bc | 478 | * (root_key.objectid, trans->transid, inode objectid, 1) |
d8d5f3e1 CM |
479 | * |
480 | * When a leaf is cow'd new references are added for every file extent found | |
31840ae1 ZY |
481 | * in the leaf. It looks similar to the create case, but trans->transid will |
482 | * be different when the block is cow'd. | |
d8d5f3e1 | 483 | * |
3bb1a1bc | 484 | * (root_key.objectid, trans->transid, inode objectid, |
31840ae1 | 485 | * number of references in the leaf) |
d8d5f3e1 | 486 | * |
3bb1a1bc YZ |
487 | * When a file extent is removed either during snapshot deletion or |
488 | * file truncation, we find the corresponding back reference and check | |
489 | * the following fields: | |
d8d5f3e1 | 490 | * |
3bb1a1bc YZ |
491 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
492 | * inode objectid) | |
d8d5f3e1 CM |
493 | * |
494 | * Btree extents can be referenced by: | |
495 | * | |
496 | * - Different subvolumes | |
497 | * - Different generations of the same subvolume | |
498 | * | |
d8d5f3e1 CM |
499 | * When a tree block is created, back references are inserted: |
500 | * | |
3bb1a1bc | 501 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 502 | * |
31840ae1 ZY |
503 | * When a tree block is cow'd, new back references are added for all the |
504 | * blocks it points to. If the tree block isn't in reference counted root, | |
505 | * the old back references are removed. These new back references are of | |
506 | * the form (trans->transid will have increased since creation): | |
d8d5f3e1 | 507 | * |
3bb1a1bc | 508 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 509 | * |
31840ae1 | 510 | * When a backref is in deleting, the following fields are checked: |
d8d5f3e1 CM |
511 | * |
512 | * if backref was for a tree root: | |
3bb1a1bc | 513 | * (btrfs_header_owner(itself), btrfs_header_generation(itself), level) |
d8d5f3e1 | 514 | * else |
3bb1a1bc | 515 | * (btrfs_header_owner(parent), btrfs_header_generation(parent), level) |
d8d5f3e1 | 516 | * |
31840ae1 | 517 | * Back Reference Key composing: |
d8d5f3e1 | 518 | * |
31840ae1 ZY |
519 | * The key objectid corresponds to the first byte in the extent, the key |
520 | * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first | |
521 | * byte of parent extent. If a extent is tree root, the key offset is set | |
522 | * to the key objectid. | |
d8d5f3e1 | 523 | */ |
31840ae1 | 524 | |
d397712b | 525 | static noinline int lookup_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 | 526 | struct btrfs_root *root, |
3bb1a1bc YZ |
527 | struct btrfs_path *path, |
528 | u64 bytenr, u64 parent, | |
529 | u64 ref_root, u64 ref_generation, | |
530 | u64 owner_objectid, int del) | |
7bb86316 | 531 | { |
7bb86316 | 532 | struct btrfs_key key; |
31840ae1 ZY |
533 | struct btrfs_extent_ref *ref; |
534 | struct extent_buffer *leaf; | |
3bb1a1bc | 535 | u64 ref_objectid; |
74493f7a CM |
536 | int ret; |
537 | ||
31840ae1 ZY |
538 | key.objectid = bytenr; |
539 | key.type = BTRFS_EXTENT_REF_KEY; | |
540 | key.offset = parent; | |
541 | ||
542 | ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); | |
543 | if (ret < 0) | |
544 | goto out; | |
545 | if (ret > 0) { | |
546 | ret = -ENOENT; | |
547 | goto out; | |
548 | } | |
549 | ||
550 | leaf = path->nodes[0]; | |
551 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
3bb1a1bc | 552 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
31840ae1 | 553 | if (btrfs_ref_root(leaf, ref) != ref_root || |
3bb1a1bc YZ |
554 | btrfs_ref_generation(leaf, ref) != ref_generation || |
555 | (ref_objectid != owner_objectid && | |
556 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { | |
31840ae1 ZY |
557 | ret = -EIO; |
558 | WARN_ON(1); | |
559 | goto out; | |
560 | } | |
561 | ret = 0; | |
562 | out: | |
563 | return ret; | |
564 | } | |
565 | ||
d397712b | 566 | static noinline int insert_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
567 | struct btrfs_root *root, |
568 | struct btrfs_path *path, | |
569 | u64 bytenr, u64 parent, | |
570 | u64 ref_root, u64 ref_generation, | |
56bec294 CM |
571 | u64 owner_objectid, |
572 | int refs_to_add) | |
31840ae1 ZY |
573 | { |
574 | struct btrfs_key key; | |
575 | struct extent_buffer *leaf; | |
576 | struct btrfs_extent_ref *ref; | |
577 | u32 num_refs; | |
578 | int ret; | |
74493f7a | 579 | |
74493f7a CM |
580 | key.objectid = bytenr; |
581 | key.type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 582 | key.offset = parent; |
74493f7a | 583 | |
31840ae1 ZY |
584 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); |
585 | if (ret == 0) { | |
586 | leaf = path->nodes[0]; | |
587 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
588 | struct btrfs_extent_ref); | |
589 | btrfs_set_ref_root(leaf, ref, ref_root); | |
590 | btrfs_set_ref_generation(leaf, ref, ref_generation); | |
591 | btrfs_set_ref_objectid(leaf, ref, owner_objectid); | |
56bec294 | 592 | btrfs_set_ref_num_refs(leaf, ref, refs_to_add); |
31840ae1 ZY |
593 | } else if (ret == -EEXIST) { |
594 | u64 existing_owner; | |
56bec294 | 595 | |
31840ae1 ZY |
596 | BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); |
597 | leaf = path->nodes[0]; | |
598 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
599 | struct btrfs_extent_ref); | |
600 | if (btrfs_ref_root(leaf, ref) != ref_root || | |
601 | btrfs_ref_generation(leaf, ref) != ref_generation) { | |
602 | ret = -EIO; | |
603 | WARN_ON(1); | |
7bb86316 | 604 | goto out; |
31840ae1 ZY |
605 | } |
606 | ||
607 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
608 | BUG_ON(num_refs == 0); | |
56bec294 | 609 | btrfs_set_ref_num_refs(leaf, ref, num_refs + refs_to_add); |
31840ae1 ZY |
610 | |
611 | existing_owner = btrfs_ref_objectid(leaf, ref); | |
3bb1a1bc YZ |
612 | if (existing_owner != owner_objectid && |
613 | existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { | |
31840ae1 ZY |
614 | btrfs_set_ref_objectid(leaf, ref, |
615 | BTRFS_MULTIPLE_OBJECTIDS); | |
31840ae1 ZY |
616 | } |
617 | ret = 0; | |
618 | } else { | |
7bb86316 | 619 | goto out; |
31840ae1 | 620 | } |
7bb86316 CM |
621 | btrfs_mark_buffer_dirty(path->nodes[0]); |
622 | out: | |
623 | btrfs_release_path(root, path); | |
624 | return ret; | |
74493f7a CM |
625 | } |
626 | ||
d397712b | 627 | static noinline int remove_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 | 628 | struct btrfs_root *root, |
56bec294 CM |
629 | struct btrfs_path *path, |
630 | int refs_to_drop) | |
31840ae1 ZY |
631 | { |
632 | struct extent_buffer *leaf; | |
633 | struct btrfs_extent_ref *ref; | |
634 | u32 num_refs; | |
635 | int ret = 0; | |
636 | ||
637 | leaf = path->nodes[0]; | |
638 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
639 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
56bec294 CM |
640 | BUG_ON(num_refs < refs_to_drop); |
641 | num_refs -= refs_to_drop; | |
31840ae1 ZY |
642 | if (num_refs == 0) { |
643 | ret = btrfs_del_item(trans, root, path); | |
644 | } else { | |
645 | btrfs_set_ref_num_refs(leaf, ref, num_refs); | |
646 | btrfs_mark_buffer_dirty(leaf); | |
647 | } | |
648 | btrfs_release_path(root, path); | |
649 | return ret; | |
650 | } | |
651 | ||
4b4e25f2 | 652 | #ifdef BIO_RW_DISCARD |
15916de8 CM |
653 | static void btrfs_issue_discard(struct block_device *bdev, |
654 | u64 start, u64 len) | |
655 | { | |
15916de8 | 656 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); |
15916de8 | 657 | } |
4b4e25f2 | 658 | #endif |
15916de8 | 659 | |
1f3c79a2 LH |
660 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
661 | u64 num_bytes) | |
662 | { | |
663 | #ifdef BIO_RW_DISCARD | |
664 | int ret; | |
665 | u64 map_length = num_bytes; | |
666 | struct btrfs_multi_bio *multi = NULL; | |
667 | ||
668 | /* Tell the block device(s) that the sectors can be discarded */ | |
669 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
670 | bytenr, &map_length, &multi, 0); | |
671 | if (!ret) { | |
672 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
673 | int i; | |
674 | ||
675 | if (map_length > num_bytes) | |
676 | map_length = num_bytes; | |
677 | ||
678 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
679 | btrfs_issue_discard(stripe->dev->bdev, | |
680 | stripe->physical, | |
681 | map_length); | |
682 | } | |
683 | kfree(multi); | |
684 | } | |
685 | ||
686 | return ret; | |
687 | #else | |
688 | return 0; | |
689 | #endif | |
690 | } | |
691 | ||
31840ae1 ZY |
692 | static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
693 | struct btrfs_root *root, u64 bytenr, | |
56bec294 | 694 | u64 num_bytes, |
31840ae1 ZY |
695 | u64 orig_parent, u64 parent, |
696 | u64 orig_root, u64 ref_root, | |
697 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 698 | u64 owner_objectid) |
31840ae1 ZY |
699 | { |
700 | int ret; | |
56bec294 | 701 | int pin = owner_objectid < BTRFS_FIRST_FREE_OBJECTID; |
31840ae1 | 702 | |
56bec294 CM |
703 | ret = btrfs_update_delayed_ref(trans, bytenr, num_bytes, |
704 | orig_parent, parent, orig_root, | |
705 | ref_root, orig_generation, | |
706 | ref_generation, owner_objectid, pin); | |
31840ae1 | 707 | BUG_ON(ret); |
31840ae1 ZY |
708 | return ret; |
709 | } | |
710 | ||
711 | int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, | |
712 | struct btrfs_root *root, u64 bytenr, | |
56bec294 | 713 | u64 num_bytes, u64 orig_parent, u64 parent, |
31840ae1 | 714 | u64 ref_root, u64 ref_generation, |
3bb1a1bc | 715 | u64 owner_objectid) |
31840ae1 ZY |
716 | { |
717 | int ret; | |
718 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && | |
719 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
720 | return 0; | |
56bec294 CM |
721 | |
722 | ret = __btrfs_update_extent_ref(trans, root, bytenr, num_bytes, | |
723 | orig_parent, parent, ref_root, | |
724 | ref_root, ref_generation, | |
725 | ref_generation, owner_objectid); | |
31840ae1 ZY |
726 | return ret; |
727 | } | |
925baedd | 728 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 | 729 | struct btrfs_root *root, u64 bytenr, |
56bec294 | 730 | u64 num_bytes, |
31840ae1 ZY |
731 | u64 orig_parent, u64 parent, |
732 | u64 orig_root, u64 ref_root, | |
733 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 734 | u64 owner_objectid) |
56bec294 CM |
735 | { |
736 | int ret; | |
737 | ||
738 | ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, ref_root, | |
739 | ref_generation, owner_objectid, | |
740 | BTRFS_ADD_DELAYED_REF, 0); | |
741 | BUG_ON(ret); | |
742 | return ret; | |
743 | } | |
744 | ||
745 | static noinline_for_stack int add_extent_ref(struct btrfs_trans_handle *trans, | |
746 | struct btrfs_root *root, u64 bytenr, | |
747 | u64 num_bytes, u64 parent, u64 ref_root, | |
748 | u64 ref_generation, u64 owner_objectid, | |
749 | int refs_to_add) | |
02217ed2 | 750 | { |
5caf2a00 | 751 | struct btrfs_path *path; |
02217ed2 | 752 | int ret; |
e2fa7227 | 753 | struct btrfs_key key; |
5f39d397 | 754 | struct extent_buffer *l; |
234b63a0 | 755 | struct btrfs_extent_item *item; |
cf27e1ee | 756 | u32 refs; |
037e6390 | 757 | |
5caf2a00 | 758 | path = btrfs_alloc_path(); |
54aa1f4d CM |
759 | if (!path) |
760 | return -ENOMEM; | |
26b8003f | 761 | |
3c12ac72 | 762 | path->reada = 1; |
db94535d | 763 | key.objectid = bytenr; |
31840ae1 | 764 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 765 | key.offset = num_bytes; |
31840ae1 | 766 | |
56bec294 CM |
767 | /* first find the extent item and update its reference count */ |
768 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
769 | path, 0, 1); | |
54aa1f4d CM |
770 | if (ret < 0) |
771 | return ret; | |
31840ae1 | 772 | |
56bec294 CM |
773 | if (ret > 0) { |
774 | WARN_ON(1); | |
775 | btrfs_free_path(path); | |
776 | return -EIO; | |
777 | } | |
5f39d397 | 778 | l = path->nodes[0]; |
31840ae1 ZY |
779 | |
780 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
771ed689 CM |
781 | if (key.objectid != bytenr) { |
782 | btrfs_print_leaf(root->fs_info->extent_root, path->nodes[0]); | |
d397712b CM |
783 | printk(KERN_ERR "btrfs wanted %llu found %llu\n", |
784 | (unsigned long long)bytenr, | |
785 | (unsigned long long)key.objectid); | |
771ed689 CM |
786 | BUG(); |
787 | } | |
31840ae1 ZY |
788 | BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); |
789 | ||
56bec294 CM |
790 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
791 | ||
792 | refs = btrfs_extent_refs(l, item); | |
793 | btrfs_set_extent_refs(l, item, refs + refs_to_add); | |
794 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
795 | ||
796 | btrfs_release_path(root->fs_info->extent_root, path); | |
797 | ||
798 | path->reada = 1; | |
799 | /* now insert the actual backref */ | |
800 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
801 | path, bytenr, parent, | |
802 | ref_root, ref_generation, | |
803 | owner_objectid, refs_to_add); | |
804 | BUG_ON(ret); | |
805 | btrfs_free_path(path); | |
806 | return 0; | |
807 | } | |
808 | ||
809 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
810 | struct btrfs_root *root, | |
811 | u64 bytenr, u64 num_bytes, u64 parent, | |
812 | u64 ref_root, u64 ref_generation, | |
813 | u64 owner_objectid) | |
814 | { | |
815 | int ret; | |
816 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && | |
817 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
818 | return 0; | |
819 | ||
820 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, parent, | |
821 | 0, ref_root, 0, ref_generation, | |
822 | owner_objectid); | |
823 | return ret; | |
824 | } | |
825 | ||
826 | static int drop_delayed_ref(struct btrfs_trans_handle *trans, | |
827 | struct btrfs_root *root, | |
828 | struct btrfs_delayed_ref_node *node) | |
829 | { | |
830 | int ret = 0; | |
831 | struct btrfs_delayed_ref *ref = btrfs_delayed_node_to_ref(node); | |
832 | ||
833 | BUG_ON(node->ref_mod == 0); | |
834 | ret = __btrfs_free_extent(trans, root, node->bytenr, node->num_bytes, | |
835 | node->parent, ref->root, ref->generation, | |
836 | ref->owner_objectid, ref->pin, node->ref_mod); | |
837 | ||
838 | return ret; | |
839 | } | |
840 | ||
841 | /* helper function to actually process a single delayed ref entry */ | |
842 | static noinline int run_one_delayed_ref(struct btrfs_trans_handle *trans, | |
843 | struct btrfs_root *root, | |
844 | struct btrfs_delayed_ref_node *node, | |
845 | int insert_reserved) | |
846 | { | |
847 | int ret; | |
848 | struct btrfs_delayed_ref *ref; | |
849 | ||
850 | if (node->parent == (u64)-1) { | |
851 | struct btrfs_delayed_ref_head *head; | |
852 | /* | |
853 | * we've hit the end of the chain and we were supposed | |
854 | * to insert this extent into the tree. But, it got | |
855 | * deleted before we ever needed to insert it, so all | |
856 | * we have to do is clean up the accounting | |
857 | */ | |
858 | if (insert_reserved) { | |
859 | update_reserved_extents(root, node->bytenr, | |
860 | node->num_bytes, 0); | |
861 | } | |
862 | head = btrfs_delayed_node_to_head(node); | |
863 | mutex_unlock(&head->mutex); | |
864 | return 0; | |
865 | } | |
866 | ||
867 | ref = btrfs_delayed_node_to_ref(node); | |
868 | if (ref->action == BTRFS_ADD_DELAYED_REF) { | |
869 | if (insert_reserved) { | |
870 | struct btrfs_key ins; | |
871 | ||
872 | ins.objectid = node->bytenr; | |
873 | ins.offset = node->num_bytes; | |
874 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
875 | ||
876 | /* record the full extent allocation */ | |
877 | ret = __btrfs_alloc_reserved_extent(trans, root, | |
878 | node->parent, ref->root, | |
879 | ref->generation, ref->owner_objectid, | |
880 | &ins, node->ref_mod); | |
881 | update_reserved_extents(root, node->bytenr, | |
882 | node->num_bytes, 0); | |
883 | } else { | |
884 | /* just add one backref */ | |
885 | ret = add_extent_ref(trans, root, node->bytenr, | |
886 | node->num_bytes, | |
887 | node->parent, ref->root, ref->generation, | |
888 | ref->owner_objectid, node->ref_mod); | |
889 | } | |
890 | BUG_ON(ret); | |
891 | } else if (ref->action == BTRFS_DROP_DELAYED_REF) { | |
892 | WARN_ON(insert_reserved); | |
893 | ret = drop_delayed_ref(trans, root, node); | |
894 | } | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static noinline struct btrfs_delayed_ref_node * | |
899 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
900 | { | |
901 | struct rb_node *node; | |
902 | struct btrfs_delayed_ref_node *ref; | |
903 | int action = BTRFS_ADD_DELAYED_REF; | |
904 | again: | |
905 | /* | |
906 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
907 | * this prevents ref count from going down to zero when | |
908 | * there still are pending delayed ref. | |
909 | */ | |
910 | node = rb_prev(&head->node.rb_node); | |
911 | while (1) { | |
912 | if (!node) | |
913 | break; | |
914 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
915 | rb_node); | |
916 | if (ref->bytenr != head->node.bytenr) | |
917 | break; | |
918 | if (btrfs_delayed_node_to_ref(ref)->action == action) | |
919 | return ref; | |
920 | node = rb_prev(node); | |
921 | } | |
922 | if (action == BTRFS_ADD_DELAYED_REF) { | |
923 | action = BTRFS_DROP_DELAYED_REF; | |
924 | goto again; | |
925 | } | |
926 | return NULL; | |
927 | } | |
928 | ||
929 | /* | |
930 | * this starts processing the delayed reference count updates and | |
931 | * extent insertions we have queued up so far. count can be | |
932 | * 0, which means to process everything in the tree at the start | |
933 | * of the run (but not newly added entries), or it can be some target | |
934 | * number you'd like to process. | |
935 | */ | |
936 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
937 | struct btrfs_root *root, unsigned long count) | |
938 | { | |
939 | struct rb_node *node; | |
940 | struct btrfs_delayed_ref_root *delayed_refs; | |
941 | struct btrfs_delayed_ref_node *ref; | |
942 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
943 | int ret; | |
944 | int must_insert_reserved = 0; | |
945 | int run_all = count == (unsigned long)-1; | |
946 | ||
947 | if (root == root->fs_info->extent_root) | |
948 | root = root->fs_info->tree_root; | |
949 | ||
950 | delayed_refs = &trans->transaction->delayed_refs; | |
951 | again: | |
952 | spin_lock(&delayed_refs->lock); | |
953 | if (count == 0) | |
954 | count = delayed_refs->num_entries; | |
955 | while (1) { | |
956 | if (!locked_ref) { | |
957 | /* | |
958 | * no locked ref, go find something we can | |
959 | * process in the rbtree. We start at | |
960 | * the beginning of the tree, there may be less | |
961 | * lock contention if we do something smarter here. | |
962 | */ | |
963 | node = rb_first(&delayed_refs->root); | |
964 | if (!node) { | |
965 | spin_unlock(&delayed_refs->lock); | |
966 | break; | |
967 | } | |
968 | ||
969 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
970 | rb_node); | |
971 | ret = btrfs_lock_delayed_ref(trans, ref, &locked_ref); | |
972 | if (ret) { | |
973 | spin_unlock(&delayed_refs->lock); | |
974 | break; | |
975 | } | |
976 | } | |
a28ec197 | 977 | |
56bec294 CM |
978 | /* |
979 | * record the must insert reserved flag before we | |
980 | * drop the spin lock. | |
981 | */ | |
982 | must_insert_reserved = locked_ref->must_insert_reserved; | |
983 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 984 | |
56bec294 CM |
985 | /* |
986 | * locked_ref is the head node, so we have to go one | |
987 | * node back for any delayed ref updates | |
988 | */ | |
74493f7a | 989 | |
56bec294 CM |
990 | ref = select_delayed_ref(locked_ref); |
991 | if (!ref) { | |
992 | /* All delayed refs have been processed, Go ahead | |
993 | * and send the head node to run_one_delayed_ref, | |
994 | * so that any accounting fixes can happen | |
995 | */ | |
996 | ref = &locked_ref->node; | |
997 | locked_ref = NULL; | |
998 | } | |
02217ed2 | 999 | |
56bec294 CM |
1000 | ref->in_tree = 0; |
1001 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
1002 | delayed_refs->num_entries--; | |
1003 | spin_unlock(&delayed_refs->lock); | |
925baedd | 1004 | |
56bec294 CM |
1005 | ret = run_one_delayed_ref(trans, root, ref, |
1006 | must_insert_reserved); | |
1007 | BUG_ON(ret); | |
1008 | btrfs_put_delayed_ref(ref); | |
eb099670 | 1009 | |
56bec294 CM |
1010 | /* once we lock the head ref, we have to process all the |
1011 | * entries for it. So, we might end up doing more entries | |
1012 | * that count was asking us to do. | |
1013 | */ | |
1014 | if (count > 0) | |
1015 | count--; | |
eb099670 | 1016 | |
56bec294 CM |
1017 | /* |
1018 | * we set locked_ref to null above if we're all done | |
1019 | * with this bytenr | |
1020 | */ | |
1021 | if (!locked_ref && count == 0) | |
1022 | break; | |
1023 | ||
1024 | spin_lock(&delayed_refs->lock); | |
eb099670 | 1025 | } |
56bec294 CM |
1026 | if (run_all) { |
1027 | spin_lock(&delayed_refs->lock); | |
1028 | node = rb_first(&delayed_refs->root); | |
1029 | if (!node) { | |
1030 | spin_unlock(&delayed_refs->lock); | |
1031 | goto out; | |
1032 | } | |
e9d0b13b | 1033 | |
56bec294 CM |
1034 | while (node) { |
1035 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
1036 | rb_node); | |
1037 | if (btrfs_delayed_ref_is_head(ref)) { | |
1038 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 1039 | |
56bec294 CM |
1040 | head = btrfs_delayed_node_to_head(ref); |
1041 | atomic_inc(&ref->refs); | |
1042 | ||
1043 | spin_unlock(&delayed_refs->lock); | |
1044 | mutex_lock(&head->mutex); | |
1045 | mutex_unlock(&head->mutex); | |
1046 | ||
1047 | btrfs_put_delayed_ref(ref); | |
1048 | goto again; | |
1049 | } | |
1050 | node = rb_next(node); | |
1051 | } | |
1052 | spin_unlock(&delayed_refs->lock); | |
1053 | count = (unsigned long)-1; | |
1054 | schedule_timeout(1); | |
1055 | goto again; | |
5f39d397 | 1056 | } |
54aa1f4d | 1057 | out: |
a28ec197 CM |
1058 | return 0; |
1059 | } | |
1060 | ||
80ff3856 | 1061 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
17d217fe | 1062 | struct btrfs_root *root, u64 objectid, u64 bytenr) |
be20aa9d CM |
1063 | { |
1064 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
1065 | struct btrfs_path *path; | |
f321e491 YZ |
1066 | struct extent_buffer *leaf; |
1067 | struct btrfs_extent_ref *ref_item; | |
1068 | struct btrfs_key key; | |
1069 | struct btrfs_key found_key; | |
80ff3856 YZ |
1070 | u64 ref_root; |
1071 | u64 last_snapshot; | |
be20aa9d CM |
1072 | u32 nritems; |
1073 | int ret; | |
925baedd | 1074 | |
be20aa9d | 1075 | key.objectid = bytenr; |
31840ae1 | 1076 | key.offset = (u64)-1; |
f321e491 | 1077 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 1078 | |
f321e491 | 1079 | path = btrfs_alloc_path(); |
be20aa9d CM |
1080 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
1081 | if (ret < 0) | |
1082 | goto out; | |
1083 | BUG_ON(ret == 0); | |
80ff3856 YZ |
1084 | |
1085 | ret = -ENOENT; | |
1086 | if (path->slots[0] == 0) | |
31840ae1 | 1087 | goto out; |
be20aa9d | 1088 | |
31840ae1 | 1089 | path->slots[0]--; |
f321e491 YZ |
1090 | leaf = path->nodes[0]; |
1091 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
be20aa9d CM |
1092 | |
1093 | if (found_key.objectid != bytenr || | |
80ff3856 | 1094 | found_key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 1095 | goto out; |
f321e491 | 1096 | |
80ff3856 | 1097 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
be20aa9d | 1098 | while (1) { |
f321e491 YZ |
1099 | leaf = path->nodes[0]; |
1100 | nritems = btrfs_header_nritems(leaf); | |
be20aa9d CM |
1101 | if (path->slots[0] >= nritems) { |
1102 | ret = btrfs_next_leaf(extent_root, path); | |
f321e491 YZ |
1103 | if (ret < 0) |
1104 | goto out; | |
be20aa9d CM |
1105 | if (ret == 0) |
1106 | continue; | |
1107 | break; | |
1108 | } | |
f321e491 | 1109 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
be20aa9d CM |
1110 | if (found_key.objectid != bytenr) |
1111 | break; | |
bd09835d | 1112 | |
be20aa9d CM |
1113 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
1114 | path->slots[0]++; | |
1115 | continue; | |
1116 | } | |
1117 | ||
f321e491 | 1118 | ref_item = btrfs_item_ptr(leaf, path->slots[0], |
be20aa9d | 1119 | struct btrfs_extent_ref); |
80ff3856 | 1120 | ref_root = btrfs_ref_root(leaf, ref_item); |
17d217fe YZ |
1121 | if ((ref_root != root->root_key.objectid && |
1122 | ref_root != BTRFS_TREE_LOG_OBJECTID) || | |
1123 | objectid != btrfs_ref_objectid(leaf, ref_item)) { | |
80ff3856 | 1124 | ret = 1; |
f321e491 | 1125 | goto out; |
80ff3856 YZ |
1126 | } |
1127 | if (btrfs_ref_generation(leaf, ref_item) <= last_snapshot) { | |
f321e491 YZ |
1128 | ret = 1; |
1129 | goto out; | |
1130 | } | |
80ff3856 YZ |
1131 | |
1132 | path->slots[0]++; | |
f321e491 YZ |
1133 | } |
1134 | ret = 0; | |
be20aa9d | 1135 | out: |
80ff3856 | 1136 | btrfs_free_path(path); |
f321e491 | 1137 | return ret; |
be20aa9d | 1138 | } |
c5739bba | 1139 | |
31840ae1 ZY |
1140 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
1141 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 1142 | { |
5f39d397 | 1143 | struct btrfs_key key; |
6407bf6d | 1144 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
1145 | u64 root_gen; |
1146 | u32 nritems; | |
02217ed2 | 1147 | int i; |
db94535d | 1148 | int level; |
31840ae1 | 1149 | int ret = 0; |
e4657689 | 1150 | int shared = 0; |
a28ec197 | 1151 | |
3768f368 | 1152 | if (!root->ref_cows) |
a28ec197 | 1153 | return 0; |
5f39d397 | 1154 | |
e4657689 ZY |
1155 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
1156 | shared = 0; | |
1157 | root_gen = root->root_key.offset; | |
1158 | } else { | |
1159 | shared = 1; | |
1160 | root_gen = trans->transid - 1; | |
1161 | } | |
1162 | ||
db94535d | 1163 | level = btrfs_header_level(buf); |
5f39d397 | 1164 | nritems = btrfs_header_nritems(buf); |
4a096752 | 1165 | |
31840ae1 | 1166 | if (level == 0) { |
31153d81 YZ |
1167 | struct btrfs_leaf_ref *ref; |
1168 | struct btrfs_extent_info *info; | |
1169 | ||
31840ae1 | 1170 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 1171 | if (!ref) { |
31840ae1 | 1172 | ret = -ENOMEM; |
31153d81 YZ |
1173 | goto out; |
1174 | } | |
1175 | ||
e4657689 | 1176 | ref->root_gen = root_gen; |
31153d81 YZ |
1177 | ref->bytenr = buf->start; |
1178 | ref->owner = btrfs_header_owner(buf); | |
1179 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 1180 | ref->nritems = nr_extents; |
31153d81 | 1181 | info = ref->extents; |
bcc63abb | 1182 | |
31840ae1 | 1183 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
1184 | u64 disk_bytenr; |
1185 | btrfs_item_key_to_cpu(buf, &key, i); | |
1186 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1187 | continue; | |
1188 | fi = btrfs_item_ptr(buf, i, | |
1189 | struct btrfs_file_extent_item); | |
1190 | if (btrfs_file_extent_type(buf, fi) == | |
1191 | BTRFS_FILE_EXTENT_INLINE) | |
1192 | continue; | |
1193 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1194 | if (disk_bytenr == 0) | |
1195 | continue; | |
1196 | ||
1197 | info->bytenr = disk_bytenr; | |
1198 | info->num_bytes = | |
1199 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
1200 | info->objectid = key.objectid; | |
1201 | info->offset = key.offset; | |
1202 | info++; | |
1203 | } | |
1204 | ||
e4657689 | 1205 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
1206 | if (ret == -EEXIST && shared) { |
1207 | struct btrfs_leaf_ref *old; | |
1208 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
1209 | BUG_ON(!old); | |
1210 | btrfs_remove_leaf_ref(root, old); | |
1211 | btrfs_free_leaf_ref(root, old); | |
1212 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
1213 | } | |
31153d81 | 1214 | WARN_ON(ret); |
bcc63abb | 1215 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
1216 | } |
1217 | out: | |
31840ae1 ZY |
1218 | return ret; |
1219 | } | |
1220 | ||
b7a9f29f CM |
1221 | /* when a block goes through cow, we update the reference counts of |
1222 | * everything that block points to. The internal pointers of the block | |
1223 | * can be in just about any order, and it is likely to have clusters of | |
1224 | * things that are close together and clusters of things that are not. | |
1225 | * | |
1226 | * To help reduce the seeks that come with updating all of these reference | |
1227 | * counts, sort them by byte number before actual updates are done. | |
1228 | * | |
1229 | * struct refsort is used to match byte number to slot in the btree block. | |
1230 | * we sort based on the byte number and then use the slot to actually | |
1231 | * find the item. | |
bd56b302 CM |
1232 | * |
1233 | * struct refsort is smaller than strcut btrfs_item and smaller than | |
1234 | * struct btrfs_key_ptr. Since we're currently limited to the page size | |
1235 | * for a btree block, there's no way for a kmalloc of refsorts for a | |
1236 | * single node to be bigger than a page. | |
b7a9f29f CM |
1237 | */ |
1238 | struct refsort { | |
1239 | u64 bytenr; | |
1240 | u32 slot; | |
1241 | }; | |
1242 | ||
1243 | /* | |
1244 | * for passing into sort() | |
1245 | */ | |
1246 | static int refsort_cmp(const void *a_void, const void *b_void) | |
1247 | { | |
1248 | const struct refsort *a = a_void; | |
1249 | const struct refsort *b = b_void; | |
1250 | ||
1251 | if (a->bytenr < b->bytenr) | |
1252 | return -1; | |
1253 | if (a->bytenr > b->bytenr) | |
1254 | return 1; | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | ||
1259 | noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans, | |
1260 | struct btrfs_root *root, | |
1261 | struct extent_buffer *orig_buf, | |
1262 | struct extent_buffer *buf, u32 *nr_extents) | |
31840ae1 ZY |
1263 | { |
1264 | u64 bytenr; | |
1265 | u64 ref_root; | |
1266 | u64 orig_root; | |
1267 | u64 ref_generation; | |
1268 | u64 orig_generation; | |
b7a9f29f | 1269 | struct refsort *sorted; |
31840ae1 ZY |
1270 | u32 nritems; |
1271 | u32 nr_file_extents = 0; | |
1272 | struct btrfs_key key; | |
1273 | struct btrfs_file_extent_item *fi; | |
1274 | int i; | |
1275 | int level; | |
1276 | int ret = 0; | |
1277 | int faili = 0; | |
b7a9f29f CM |
1278 | int refi = 0; |
1279 | int slot; | |
31840ae1 | 1280 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
56bec294 | 1281 | u64, u64, u64, u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
1282 | |
1283 | ref_root = btrfs_header_owner(buf); | |
1284 | ref_generation = btrfs_header_generation(buf); | |
1285 | orig_root = btrfs_header_owner(orig_buf); | |
1286 | orig_generation = btrfs_header_generation(orig_buf); | |
1287 | ||
1288 | nritems = btrfs_header_nritems(buf); | |
1289 | level = btrfs_header_level(buf); | |
1290 | ||
b7a9f29f CM |
1291 | sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS); |
1292 | BUG_ON(!sorted); | |
1293 | ||
31840ae1 ZY |
1294 | if (root->ref_cows) { |
1295 | process_func = __btrfs_inc_extent_ref; | |
1296 | } else { | |
1297 | if (level == 0 && | |
1298 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1299 | goto out; | |
1300 | if (level != 0 && | |
1301 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1302 | goto out; | |
1303 | process_func = __btrfs_update_extent_ref; | |
1304 | } | |
1305 | ||
b7a9f29f CM |
1306 | /* |
1307 | * we make two passes through the items. In the first pass we | |
1308 | * only record the byte number and slot. Then we sort based on | |
1309 | * byte number and do the actual work based on the sorted results | |
1310 | */ | |
31840ae1 ZY |
1311 | for (i = 0; i < nritems; i++) { |
1312 | cond_resched(); | |
db94535d | 1313 | if (level == 0) { |
5f39d397 CM |
1314 | btrfs_item_key_to_cpu(buf, &key, i); |
1315 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 1316 | continue; |
5f39d397 | 1317 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 1318 | struct btrfs_file_extent_item); |
5f39d397 | 1319 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
1320 | BTRFS_FILE_EXTENT_INLINE) |
1321 | continue; | |
31840ae1 ZY |
1322 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
1323 | if (bytenr == 0) | |
54aa1f4d | 1324 | continue; |
31840ae1 ZY |
1325 | |
1326 | nr_file_extents++; | |
b7a9f29f CM |
1327 | sorted[refi].bytenr = bytenr; |
1328 | sorted[refi].slot = i; | |
1329 | refi++; | |
1330 | } else { | |
1331 | bytenr = btrfs_node_blockptr(buf, i); | |
1332 | sorted[refi].bytenr = bytenr; | |
1333 | sorted[refi].slot = i; | |
1334 | refi++; | |
1335 | } | |
1336 | } | |
1337 | /* | |
1338 | * if refi == 0, we didn't actually put anything into the sorted | |
1339 | * array and we're done | |
1340 | */ | |
1341 | if (refi == 0) | |
1342 | goto out; | |
1343 | ||
1344 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); | |
1345 | ||
1346 | for (i = 0; i < refi; i++) { | |
1347 | cond_resched(); | |
1348 | slot = sorted[i].slot; | |
1349 | bytenr = sorted[i].bytenr; | |
1350 | ||
1351 | if (level == 0) { | |
1352 | btrfs_item_key_to_cpu(buf, &key, slot); | |
56bec294 CM |
1353 | fi = btrfs_item_ptr(buf, slot, |
1354 | struct btrfs_file_extent_item); | |
1355 | ||
1356 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1357 | if (bytenr == 0) | |
1358 | continue; | |
31840ae1 | 1359 | |
31840ae1 | 1360 | ret = process_func(trans, root, bytenr, |
56bec294 CM |
1361 | btrfs_file_extent_disk_num_bytes(buf, fi), |
1362 | orig_buf->start, buf->start, | |
1363 | orig_root, ref_root, | |
1364 | orig_generation, ref_generation, | |
1365 | key.objectid); | |
31840ae1 ZY |
1366 | |
1367 | if (ret) { | |
b7a9f29f | 1368 | faili = slot; |
31840ae1 ZY |
1369 | WARN_ON(1); |
1370 | goto fail; | |
1371 | } | |
54aa1f4d | 1372 | } else { |
56bec294 | 1373 | ret = process_func(trans, root, bytenr, buf->len, |
31840ae1 ZY |
1374 | orig_buf->start, buf->start, |
1375 | orig_root, ref_root, | |
1376 | orig_generation, ref_generation, | |
3bb1a1bc | 1377 | level - 1); |
31840ae1 | 1378 | if (ret) { |
b7a9f29f | 1379 | faili = slot; |
31840ae1 ZY |
1380 | WARN_ON(1); |
1381 | goto fail; | |
1382 | } | |
54aa1f4d CM |
1383 | } |
1384 | } | |
31840ae1 | 1385 | out: |
b7a9f29f | 1386 | kfree(sorted); |
31840ae1 ZY |
1387 | if (nr_extents) { |
1388 | if (level == 0) | |
1389 | *nr_extents = nr_file_extents; | |
1390 | else | |
1391 | *nr_extents = nritems; | |
1392 | } | |
1393 | return 0; | |
1394 | fail: | |
b7a9f29f | 1395 | kfree(sorted); |
31840ae1 | 1396 | WARN_ON(1); |
54aa1f4d | 1397 | return ret; |
02217ed2 CM |
1398 | } |
1399 | ||
31840ae1 ZY |
1400 | int btrfs_update_ref(struct btrfs_trans_handle *trans, |
1401 | struct btrfs_root *root, struct extent_buffer *orig_buf, | |
1402 | struct extent_buffer *buf, int start_slot, int nr) | |
1403 | ||
1404 | { | |
1405 | u64 bytenr; | |
1406 | u64 ref_root; | |
1407 | u64 orig_root; | |
1408 | u64 ref_generation; | |
1409 | u64 orig_generation; | |
1410 | struct btrfs_key key; | |
1411 | struct btrfs_file_extent_item *fi; | |
1412 | int i; | |
1413 | int ret; | |
1414 | int slot; | |
1415 | int level; | |
1416 | ||
1417 | BUG_ON(start_slot < 0); | |
1418 | BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); | |
1419 | ||
1420 | ref_root = btrfs_header_owner(buf); | |
1421 | ref_generation = btrfs_header_generation(buf); | |
1422 | orig_root = btrfs_header_owner(orig_buf); | |
1423 | orig_generation = btrfs_header_generation(orig_buf); | |
1424 | level = btrfs_header_level(buf); | |
1425 | ||
1426 | if (!root->ref_cows) { | |
1427 | if (level == 0 && | |
1428 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1429 | return 0; | |
1430 | if (level != 0 && | |
1431 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | for (i = 0, slot = start_slot; i < nr; i++, slot++) { | |
1436 | cond_resched(); | |
1437 | if (level == 0) { | |
1438 | btrfs_item_key_to_cpu(buf, &key, slot); | |
1439 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1440 | continue; | |
1441 | fi = btrfs_item_ptr(buf, slot, | |
1442 | struct btrfs_file_extent_item); | |
1443 | if (btrfs_file_extent_type(buf, fi) == | |
1444 | BTRFS_FILE_EXTENT_INLINE) | |
1445 | continue; | |
1446 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1447 | if (bytenr == 0) | |
1448 | continue; | |
31840ae1 | 1449 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
56bec294 CM |
1450 | btrfs_file_extent_disk_num_bytes(buf, fi), |
1451 | orig_buf->start, buf->start, | |
1452 | orig_root, ref_root, orig_generation, | |
1453 | ref_generation, key.objectid); | |
31840ae1 ZY |
1454 | if (ret) |
1455 | goto fail; | |
1456 | } else { | |
1457 | bytenr = btrfs_node_blockptr(buf, slot); | |
31840ae1 | 1458 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
56bec294 CM |
1459 | buf->len, orig_buf->start, |
1460 | buf->start, orig_root, ref_root, | |
31840ae1 | 1461 | orig_generation, ref_generation, |
3bb1a1bc | 1462 | level - 1); |
31840ae1 ZY |
1463 | if (ret) |
1464 | goto fail; | |
1465 | } | |
1466 | } | |
1467 | return 0; | |
1468 | fail: | |
1469 | WARN_ON(1); | |
1470 | return -1; | |
1471 | } | |
1472 | ||
9078a3e1 CM |
1473 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
1474 | struct btrfs_root *root, | |
1475 | struct btrfs_path *path, | |
1476 | struct btrfs_block_group_cache *cache) | |
1477 | { | |
1478 | int ret; | |
9078a3e1 | 1479 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
1480 | unsigned long bi; |
1481 | struct extent_buffer *leaf; | |
9078a3e1 | 1482 | |
9078a3e1 | 1483 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
1484 | if (ret < 0) |
1485 | goto fail; | |
9078a3e1 | 1486 | BUG_ON(ret); |
5f39d397 CM |
1487 | |
1488 | leaf = path->nodes[0]; | |
1489 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1490 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
1491 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 1492 | btrfs_release_path(extent_root, path); |
54aa1f4d | 1493 | fail: |
9078a3e1 CM |
1494 | if (ret) |
1495 | return ret; | |
9078a3e1 CM |
1496 | return 0; |
1497 | ||
1498 | } | |
1499 | ||
96b5179d CM |
1500 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
1501 | struct btrfs_root *root) | |
9078a3e1 | 1502 | { |
0f9dd46c JB |
1503 | struct btrfs_block_group_cache *cache, *entry; |
1504 | struct rb_node *n; | |
9078a3e1 CM |
1505 | int err = 0; |
1506 | int werr = 0; | |
9078a3e1 | 1507 | struct btrfs_path *path; |
96b5179d | 1508 | u64 last = 0; |
9078a3e1 CM |
1509 | |
1510 | path = btrfs_alloc_path(); | |
1511 | if (!path) | |
1512 | return -ENOMEM; | |
1513 | ||
d397712b | 1514 | while (1) { |
0f9dd46c JB |
1515 | cache = NULL; |
1516 | spin_lock(&root->fs_info->block_group_cache_lock); | |
1517 | for (n = rb_first(&root->fs_info->block_group_cache_tree); | |
1518 | n; n = rb_next(n)) { | |
1519 | entry = rb_entry(n, struct btrfs_block_group_cache, | |
1520 | cache_node); | |
1521 | if (entry->dirty) { | |
1522 | cache = entry; | |
1523 | break; | |
1524 | } | |
1525 | } | |
1526 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
54aa1f4d | 1527 | |
0f9dd46c | 1528 | if (!cache) |
96b5179d | 1529 | break; |
0f9dd46c | 1530 | |
e8569813 | 1531 | cache->dirty = 0; |
0f9dd46c JB |
1532 | last += cache->key.offset; |
1533 | ||
96b5179d CM |
1534 | err = write_one_cache_group(trans, root, |
1535 | path, cache); | |
1536 | /* | |
1537 | * if we fail to write the cache group, we want | |
1538 | * to keep it marked dirty in hopes that a later | |
1539 | * write will work | |
1540 | */ | |
1541 | if (err) { | |
1542 | werr = err; | |
1543 | continue; | |
9078a3e1 CM |
1544 | } |
1545 | } | |
1546 | btrfs_free_path(path); | |
1547 | return werr; | |
1548 | } | |
1549 | ||
d2fb3437 YZ |
1550 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
1551 | { | |
1552 | struct btrfs_block_group_cache *block_group; | |
1553 | int readonly = 0; | |
1554 | ||
1555 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
1556 | if (!block_group || block_group->ro) | |
1557 | readonly = 1; | |
1558 | if (block_group) | |
1559 | put_block_group(block_group); | |
1560 | return readonly; | |
1561 | } | |
1562 | ||
593060d7 CM |
1563 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1564 | u64 total_bytes, u64 bytes_used, | |
1565 | struct btrfs_space_info **space_info) | |
1566 | { | |
1567 | struct btrfs_space_info *found; | |
1568 | ||
1569 | found = __find_space_info(info, flags); | |
1570 | if (found) { | |
25179201 | 1571 | spin_lock(&found->lock); |
593060d7 CM |
1572 | found->total_bytes += total_bytes; |
1573 | found->bytes_used += bytes_used; | |
8f18cf13 | 1574 | found->full = 0; |
25179201 | 1575 | spin_unlock(&found->lock); |
593060d7 CM |
1576 | *space_info = found; |
1577 | return 0; | |
1578 | } | |
c146afad | 1579 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
1580 | if (!found) |
1581 | return -ENOMEM; | |
1582 | ||
0f9dd46c | 1583 | INIT_LIST_HEAD(&found->block_groups); |
80eb234a | 1584 | init_rwsem(&found->groups_sem); |
0f9dd46c | 1585 | spin_lock_init(&found->lock); |
593060d7 CM |
1586 | found->flags = flags; |
1587 | found->total_bytes = total_bytes; | |
1588 | found->bytes_used = bytes_used; | |
1589 | found->bytes_pinned = 0; | |
e8569813 | 1590 | found->bytes_reserved = 0; |
c146afad | 1591 | found->bytes_readonly = 0; |
6a63209f | 1592 | found->bytes_delalloc = 0; |
593060d7 | 1593 | found->full = 0; |
0ef3e66b | 1594 | found->force_alloc = 0; |
593060d7 | 1595 | *space_info = found; |
4184ea7f | 1596 | list_add_rcu(&found->list, &info->space_info); |
593060d7 CM |
1597 | return 0; |
1598 | } | |
1599 | ||
8790d502 CM |
1600 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1601 | { | |
1602 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1603 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1604 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1605 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1606 | if (extra_flags) { |
1607 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1608 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1609 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1610 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1611 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1612 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1613 | } | |
1614 | } | |
593060d7 | 1615 | |
c146afad YZ |
1616 | static void set_block_group_readonly(struct btrfs_block_group_cache *cache) |
1617 | { | |
1618 | spin_lock(&cache->space_info->lock); | |
1619 | spin_lock(&cache->lock); | |
1620 | if (!cache->ro) { | |
1621 | cache->space_info->bytes_readonly += cache->key.offset - | |
1622 | btrfs_block_group_used(&cache->item); | |
1623 | cache->ro = 1; | |
1624 | } | |
1625 | spin_unlock(&cache->lock); | |
1626 | spin_unlock(&cache->space_info->lock); | |
1627 | } | |
1628 | ||
2b82032c | 1629 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1630 | { |
2b82032c | 1631 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
a061fc8d CM |
1632 | |
1633 | if (num_devices == 1) | |
1634 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1635 | if (num_devices < 4) | |
1636 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1637 | ||
ec44a35c CM |
1638 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1639 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1640 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1641 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1642 | } |
ec44a35c CM |
1643 | |
1644 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1645 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1646 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1647 | } |
ec44a35c CM |
1648 | |
1649 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1650 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1651 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1652 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1653 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1654 | return flags; | |
1655 | } | |
1656 | ||
6a63209f JB |
1657 | static u64 btrfs_get_alloc_profile(struct btrfs_root *root, u64 data) |
1658 | { | |
1659 | struct btrfs_fs_info *info = root->fs_info; | |
1660 | u64 alloc_profile; | |
1661 | ||
1662 | if (data) { | |
1663 | alloc_profile = info->avail_data_alloc_bits & | |
1664 | info->data_alloc_profile; | |
1665 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
1666 | } else if (root == root->fs_info->chunk_root) { | |
1667 | alloc_profile = info->avail_system_alloc_bits & | |
1668 | info->system_alloc_profile; | |
1669 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
1670 | } else { | |
1671 | alloc_profile = info->avail_metadata_alloc_bits & | |
1672 | info->metadata_alloc_profile; | |
1673 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
1674 | } | |
1675 | ||
1676 | return btrfs_reduce_alloc_profile(root, data); | |
1677 | } | |
1678 | ||
1679 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) | |
1680 | { | |
1681 | u64 alloc_target; | |
1682 | ||
1683 | alloc_target = btrfs_get_alloc_profile(root, 1); | |
1684 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, | |
1685 | alloc_target); | |
1686 | } | |
1687 | ||
1688 | /* | |
1689 | * for now this just makes sure we have at least 5% of our metadata space free | |
1690 | * for use. | |
1691 | */ | |
1692 | int btrfs_check_metadata_free_space(struct btrfs_root *root) | |
1693 | { | |
1694 | struct btrfs_fs_info *info = root->fs_info; | |
1695 | struct btrfs_space_info *meta_sinfo; | |
1696 | u64 alloc_target, thresh; | |
4e06bdd6 | 1697 | int committed = 0, ret; |
6a63209f JB |
1698 | |
1699 | /* get the space info for where the metadata will live */ | |
1700 | alloc_target = btrfs_get_alloc_profile(root, 0); | |
1701 | meta_sinfo = __find_space_info(info, alloc_target); | |
1702 | ||
4e06bdd6 | 1703 | again: |
6a63209f | 1704 | spin_lock(&meta_sinfo->lock); |
4e06bdd6 JB |
1705 | if (!meta_sinfo->full) |
1706 | thresh = meta_sinfo->total_bytes * 80; | |
1707 | else | |
1708 | thresh = meta_sinfo->total_bytes * 95; | |
6a63209f JB |
1709 | |
1710 | do_div(thresh, 100); | |
1711 | ||
1712 | if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + | |
1713 | meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) { | |
4e06bdd6 JB |
1714 | struct btrfs_trans_handle *trans; |
1715 | if (!meta_sinfo->full) { | |
1716 | meta_sinfo->force_alloc = 1; | |
1717 | spin_unlock(&meta_sinfo->lock); | |
1718 | ||
1719 | trans = btrfs_start_transaction(root, 1); | |
1720 | if (!trans) | |
1721 | return -ENOMEM; | |
1722 | ||
1723 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
1724 | 2 * 1024 * 1024, alloc_target, 0); | |
1725 | btrfs_end_transaction(trans, root); | |
1726 | goto again; | |
1727 | } | |
6a63209f | 1728 | spin_unlock(&meta_sinfo->lock); |
4e06bdd6 JB |
1729 | |
1730 | if (!committed) { | |
1731 | committed = 1; | |
1732 | trans = btrfs_join_transaction(root, 1); | |
1733 | if (!trans) | |
1734 | return -ENOMEM; | |
1735 | ret = btrfs_commit_transaction(trans, root); | |
1736 | if (ret) | |
1737 | return ret; | |
1738 | goto again; | |
1739 | } | |
6a63209f JB |
1740 | return -ENOSPC; |
1741 | } | |
1742 | spin_unlock(&meta_sinfo->lock); | |
1743 | ||
1744 | return 0; | |
1745 | } | |
1746 | ||
1747 | /* | |
1748 | * This will check the space that the inode allocates from to make sure we have | |
1749 | * enough space for bytes. | |
1750 | */ | |
1751 | int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, | |
1752 | u64 bytes) | |
1753 | { | |
1754 | struct btrfs_space_info *data_sinfo; | |
4e06bdd6 | 1755 | int ret = 0, committed = 0; |
6a63209f JB |
1756 | |
1757 | /* make sure bytes are sectorsize aligned */ | |
1758 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
1759 | ||
1760 | data_sinfo = BTRFS_I(inode)->space_info; | |
1761 | again: | |
1762 | /* make sure we have enough space to handle the data first */ | |
1763 | spin_lock(&data_sinfo->lock); | |
1764 | if (data_sinfo->total_bytes - data_sinfo->bytes_used - | |
1765 | data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved - | |
1766 | data_sinfo->bytes_pinned - data_sinfo->bytes_readonly - | |
1767 | data_sinfo->bytes_may_use < bytes) { | |
4e06bdd6 JB |
1768 | struct btrfs_trans_handle *trans; |
1769 | ||
6a63209f JB |
1770 | /* |
1771 | * if we don't have enough free bytes in this space then we need | |
1772 | * to alloc a new chunk. | |
1773 | */ | |
1774 | if (!data_sinfo->full) { | |
1775 | u64 alloc_target; | |
6a63209f JB |
1776 | |
1777 | data_sinfo->force_alloc = 1; | |
1778 | spin_unlock(&data_sinfo->lock); | |
1779 | ||
1780 | alloc_target = btrfs_get_alloc_profile(root, 1); | |
1781 | trans = btrfs_start_transaction(root, 1); | |
1782 | if (!trans) | |
1783 | return -ENOMEM; | |
1784 | ||
1785 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
1786 | bytes + 2 * 1024 * 1024, | |
1787 | alloc_target, 0); | |
1788 | btrfs_end_transaction(trans, root); | |
1789 | if (ret) | |
1790 | return ret; | |
1791 | goto again; | |
1792 | } | |
1793 | spin_unlock(&data_sinfo->lock); | |
4e06bdd6 JB |
1794 | |
1795 | /* commit the current transaction and try again */ | |
1796 | if (!committed) { | |
1797 | committed = 1; | |
1798 | trans = btrfs_join_transaction(root, 1); | |
1799 | if (!trans) | |
1800 | return -ENOMEM; | |
1801 | ret = btrfs_commit_transaction(trans, root); | |
1802 | if (ret) | |
1803 | return ret; | |
1804 | goto again; | |
1805 | } | |
1806 | ||
6a63209f JB |
1807 | printk(KERN_ERR "no space left, need %llu, %llu delalloc bytes" |
1808 | ", %llu bytes_used, %llu bytes_reserved, " | |
1809 | "%llu bytes_pinned, %llu bytes_readonly, %llu may use" | |
1810 | "%llu total\n", bytes, data_sinfo->bytes_delalloc, | |
1811 | data_sinfo->bytes_used, data_sinfo->bytes_reserved, | |
1812 | data_sinfo->bytes_pinned, data_sinfo->bytes_readonly, | |
1813 | data_sinfo->bytes_may_use, data_sinfo->total_bytes); | |
1814 | return -ENOSPC; | |
1815 | } | |
1816 | data_sinfo->bytes_may_use += bytes; | |
1817 | BTRFS_I(inode)->reserved_bytes += bytes; | |
1818 | spin_unlock(&data_sinfo->lock); | |
1819 | ||
1820 | return btrfs_check_metadata_free_space(root); | |
1821 | } | |
1822 | ||
1823 | /* | |
1824 | * if there was an error for whatever reason after calling | |
1825 | * btrfs_check_data_free_space, call this so we can cleanup the counters. | |
1826 | */ | |
1827 | void btrfs_free_reserved_data_space(struct btrfs_root *root, | |
1828 | struct inode *inode, u64 bytes) | |
1829 | { | |
1830 | struct btrfs_space_info *data_sinfo; | |
1831 | ||
1832 | /* make sure bytes are sectorsize aligned */ | |
1833 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
1834 | ||
1835 | data_sinfo = BTRFS_I(inode)->space_info; | |
1836 | spin_lock(&data_sinfo->lock); | |
1837 | data_sinfo->bytes_may_use -= bytes; | |
1838 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
1839 | spin_unlock(&data_sinfo->lock); | |
1840 | } | |
1841 | ||
1842 | /* called when we are adding a delalloc extent to the inode's io_tree */ | |
1843 | void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode, | |
1844 | u64 bytes) | |
1845 | { | |
1846 | struct btrfs_space_info *data_sinfo; | |
1847 | ||
1848 | /* get the space info for where this inode will be storing its data */ | |
1849 | data_sinfo = BTRFS_I(inode)->space_info; | |
1850 | ||
1851 | /* make sure we have enough space to handle the data first */ | |
1852 | spin_lock(&data_sinfo->lock); | |
1853 | data_sinfo->bytes_delalloc += bytes; | |
1854 | ||
1855 | /* | |
1856 | * we are adding a delalloc extent without calling | |
1857 | * btrfs_check_data_free_space first. This happens on a weird | |
1858 | * writepage condition, but shouldn't hurt our accounting | |
1859 | */ | |
1860 | if (unlikely(bytes > BTRFS_I(inode)->reserved_bytes)) { | |
1861 | data_sinfo->bytes_may_use -= BTRFS_I(inode)->reserved_bytes; | |
1862 | BTRFS_I(inode)->reserved_bytes = 0; | |
1863 | } else { | |
1864 | data_sinfo->bytes_may_use -= bytes; | |
1865 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
1866 | } | |
1867 | ||
1868 | spin_unlock(&data_sinfo->lock); | |
1869 | } | |
1870 | ||
1871 | /* called when we are clearing an delalloc extent from the inode's io_tree */ | |
1872 | void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, | |
1873 | u64 bytes) | |
1874 | { | |
1875 | struct btrfs_space_info *info; | |
1876 | ||
1877 | info = BTRFS_I(inode)->space_info; | |
1878 | ||
1879 | spin_lock(&info->lock); | |
1880 | info->bytes_delalloc -= bytes; | |
1881 | spin_unlock(&info->lock); | |
1882 | } | |
1883 | ||
6324fbf3 CM |
1884 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1885 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 1886 | u64 flags, int force) |
6324fbf3 CM |
1887 | { |
1888 | struct btrfs_space_info *space_info; | |
1889 | u64 thresh; | |
c146afad YZ |
1890 | int ret = 0; |
1891 | ||
1892 | mutex_lock(&extent_root->fs_info->chunk_mutex); | |
6324fbf3 | 1893 | |
2b82032c | 1894 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1895 | |
6324fbf3 | 1896 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1897 | if (!space_info) { |
1898 | ret = update_space_info(extent_root->fs_info, flags, | |
1899 | 0, 0, &space_info); | |
1900 | BUG_ON(ret); | |
1901 | } | |
6324fbf3 CM |
1902 | BUG_ON(!space_info); |
1903 | ||
25179201 | 1904 | spin_lock(&space_info->lock); |
0ef3e66b CM |
1905 | if (space_info->force_alloc) { |
1906 | force = 1; | |
1907 | space_info->force_alloc = 0; | |
1908 | } | |
25179201 JB |
1909 | if (space_info->full) { |
1910 | spin_unlock(&space_info->lock); | |
925baedd | 1911 | goto out; |
25179201 | 1912 | } |
6324fbf3 | 1913 | |
c146afad YZ |
1914 | thresh = space_info->total_bytes - space_info->bytes_readonly; |
1915 | thresh = div_factor(thresh, 6); | |
0ef3e66b | 1916 | if (!force && |
e8569813 | 1917 | (space_info->bytes_used + space_info->bytes_pinned + |
25179201 JB |
1918 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
1919 | spin_unlock(&space_info->lock); | |
925baedd | 1920 | goto out; |
25179201 | 1921 | } |
25179201 JB |
1922 | spin_unlock(&space_info->lock); |
1923 | ||
2b82032c | 1924 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
d397712b | 1925 | if (ret) |
6324fbf3 | 1926 | space_info->full = 1; |
a74a4b97 | 1927 | out: |
c146afad | 1928 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 1929 | return ret; |
6324fbf3 CM |
1930 | } |
1931 | ||
9078a3e1 CM |
1932 | static int update_block_group(struct btrfs_trans_handle *trans, |
1933 | struct btrfs_root *root, | |
db94535d | 1934 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 1935 | int mark_free) |
9078a3e1 CM |
1936 | { |
1937 | struct btrfs_block_group_cache *cache; | |
1938 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 1939 | u64 total = num_bytes; |
9078a3e1 | 1940 | u64 old_val; |
db94535d | 1941 | u64 byte_in_group; |
3e1ad54f | 1942 | |
d397712b | 1943 | while (total) { |
db94535d | 1944 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 1945 | if (!cache) |
9078a3e1 | 1946 | return -1; |
db94535d CM |
1947 | byte_in_group = bytenr - cache->key.objectid; |
1948 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 1949 | |
25179201 | 1950 | spin_lock(&cache->space_info->lock); |
c286ac48 | 1951 | spin_lock(&cache->lock); |
0f9dd46c | 1952 | cache->dirty = 1; |
9078a3e1 | 1953 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 1954 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 1955 | if (alloc) { |
db94535d | 1956 | old_val += num_bytes; |
6324fbf3 | 1957 | cache->space_info->bytes_used += num_bytes; |
a512bbf8 | 1958 | if (cache->ro) |
c146afad | 1959 | cache->space_info->bytes_readonly -= num_bytes; |
c286ac48 CM |
1960 | btrfs_set_block_group_used(&cache->item, old_val); |
1961 | spin_unlock(&cache->lock); | |
25179201 | 1962 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 1963 | } else { |
db94535d | 1964 | old_val -= num_bytes; |
6324fbf3 | 1965 | cache->space_info->bytes_used -= num_bytes; |
c146afad YZ |
1966 | if (cache->ro) |
1967 | cache->space_info->bytes_readonly += num_bytes; | |
c286ac48 CM |
1968 | btrfs_set_block_group_used(&cache->item, old_val); |
1969 | spin_unlock(&cache->lock); | |
25179201 | 1970 | spin_unlock(&cache->space_info->lock); |
f510cfec | 1971 | if (mark_free) { |
0f9dd46c | 1972 | int ret; |
1f3c79a2 LH |
1973 | |
1974 | ret = btrfs_discard_extent(root, bytenr, | |
1975 | num_bytes); | |
1976 | WARN_ON(ret); | |
1977 | ||
0f9dd46c JB |
1978 | ret = btrfs_add_free_space(cache, bytenr, |
1979 | num_bytes); | |
d2fb3437 | 1980 | WARN_ON(ret); |
e37c9e69 | 1981 | } |
cd1bc465 | 1982 | } |
d2fb3437 | 1983 | put_block_group(cache); |
db94535d CM |
1984 | total -= num_bytes; |
1985 | bytenr += num_bytes; | |
9078a3e1 CM |
1986 | } |
1987 | return 0; | |
1988 | } | |
6324fbf3 | 1989 | |
a061fc8d CM |
1990 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
1991 | { | |
0f9dd46c | 1992 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 1993 | u64 bytenr; |
0f9dd46c JB |
1994 | |
1995 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
1996 | if (!cache) | |
a061fc8d | 1997 | return 0; |
0f9dd46c | 1998 | |
d2fb3437 YZ |
1999 | bytenr = cache->key.objectid; |
2000 | put_block_group(cache); | |
2001 | ||
2002 | return bytenr; | |
a061fc8d CM |
2003 | } |
2004 | ||
e02119d5 | 2005 | int btrfs_update_pinned_extents(struct btrfs_root *root, |
324ae4df Y |
2006 | u64 bytenr, u64 num, int pin) |
2007 | { | |
2008 | u64 len; | |
2009 | struct btrfs_block_group_cache *cache; | |
2010 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2011 | ||
25179201 | 2012 | WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex)); |
324ae4df Y |
2013 | if (pin) { |
2014 | set_extent_dirty(&fs_info->pinned_extents, | |
2015 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2016 | } else { | |
2017 | clear_extent_dirty(&fs_info->pinned_extents, | |
2018 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2019 | } | |
2020 | while (num > 0) { | |
2021 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
e8569813 ZY |
2022 | BUG_ON(!cache); |
2023 | len = min(num, cache->key.offset - | |
2024 | (bytenr - cache->key.objectid)); | |
324ae4df | 2025 | if (pin) { |
25179201 | 2026 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2027 | spin_lock(&cache->lock); |
2028 | cache->pinned += len; | |
2029 | cache->space_info->bytes_pinned += len; | |
2030 | spin_unlock(&cache->lock); | |
25179201 | 2031 | spin_unlock(&cache->space_info->lock); |
324ae4df Y |
2032 | fs_info->total_pinned += len; |
2033 | } else { | |
25179201 | 2034 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2035 | spin_lock(&cache->lock); |
2036 | cache->pinned -= len; | |
2037 | cache->space_info->bytes_pinned -= len; | |
2038 | spin_unlock(&cache->lock); | |
25179201 | 2039 | spin_unlock(&cache->space_info->lock); |
324ae4df | 2040 | fs_info->total_pinned -= len; |
07103a3c JB |
2041 | if (cache->cached) |
2042 | btrfs_add_free_space(cache, bytenr, len); | |
324ae4df | 2043 | } |
d2fb3437 | 2044 | put_block_group(cache); |
324ae4df Y |
2045 | bytenr += len; |
2046 | num -= len; | |
2047 | } | |
2048 | return 0; | |
2049 | } | |
9078a3e1 | 2050 | |
e8569813 ZY |
2051 | static int update_reserved_extents(struct btrfs_root *root, |
2052 | u64 bytenr, u64 num, int reserve) | |
2053 | { | |
2054 | u64 len; | |
2055 | struct btrfs_block_group_cache *cache; | |
2056 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2057 | ||
e8569813 ZY |
2058 | while (num > 0) { |
2059 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
2060 | BUG_ON(!cache); | |
2061 | len = min(num, cache->key.offset - | |
2062 | (bytenr - cache->key.objectid)); | |
25179201 JB |
2063 | |
2064 | spin_lock(&cache->space_info->lock); | |
2065 | spin_lock(&cache->lock); | |
e8569813 | 2066 | if (reserve) { |
e8569813 ZY |
2067 | cache->reserved += len; |
2068 | cache->space_info->bytes_reserved += len; | |
e8569813 | 2069 | } else { |
e8569813 ZY |
2070 | cache->reserved -= len; |
2071 | cache->space_info->bytes_reserved -= len; | |
e8569813 | 2072 | } |
25179201 JB |
2073 | spin_unlock(&cache->lock); |
2074 | spin_unlock(&cache->space_info->lock); | |
d2fb3437 | 2075 | put_block_group(cache); |
e8569813 ZY |
2076 | bytenr += len; |
2077 | num -= len; | |
2078 | } | |
2079 | return 0; | |
2080 | } | |
2081 | ||
d1310b2e | 2082 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 2083 | { |
ccd467d6 | 2084 | u64 last = 0; |
1a5bc167 CM |
2085 | u64 start; |
2086 | u64 end; | |
d1310b2e | 2087 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 2088 | int ret; |
ccd467d6 | 2089 | |
25179201 | 2090 | mutex_lock(&root->fs_info->pinned_mutex); |
d397712b | 2091 | while (1) { |
1a5bc167 CM |
2092 | ret = find_first_extent_bit(pinned_extents, last, |
2093 | &start, &end, EXTENT_DIRTY); | |
2094 | if (ret) | |
ccd467d6 | 2095 | break; |
1a5bc167 CM |
2096 | set_extent_dirty(copy, start, end, GFP_NOFS); |
2097 | last = end + 1; | |
ccd467d6 | 2098 | } |
25179201 | 2099 | mutex_unlock(&root->fs_info->pinned_mutex); |
ccd467d6 CM |
2100 | return 0; |
2101 | } | |
2102 | ||
2103 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
2104 | struct btrfs_root *root, | |
d1310b2e | 2105 | struct extent_io_tree *unpin) |
a28ec197 | 2106 | { |
1a5bc167 CM |
2107 | u64 start; |
2108 | u64 end; | |
a28ec197 | 2109 | int ret; |
a28ec197 | 2110 | |
25179201 | 2111 | mutex_lock(&root->fs_info->pinned_mutex); |
d397712b | 2112 | while (1) { |
1a5bc167 CM |
2113 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
2114 | EXTENT_DIRTY); | |
2115 | if (ret) | |
a28ec197 | 2116 | break; |
1f3c79a2 LH |
2117 | |
2118 | ret = btrfs_discard_extent(root, start, end + 1 - start); | |
2119 | ||
e02119d5 | 2120 | btrfs_update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 | 2121 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
1f3c79a2 | 2122 | |
c286ac48 | 2123 | if (need_resched()) { |
25179201 | 2124 | mutex_unlock(&root->fs_info->pinned_mutex); |
c286ac48 | 2125 | cond_resched(); |
25179201 | 2126 | mutex_lock(&root->fs_info->pinned_mutex); |
c286ac48 | 2127 | } |
a28ec197 | 2128 | } |
25179201 | 2129 | mutex_unlock(&root->fs_info->pinned_mutex); |
1f3c79a2 | 2130 | return ret; |
a28ec197 CM |
2131 | } |
2132 | ||
31840ae1 ZY |
2133 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
2134 | struct btrfs_root *root, | |
2135 | u64 bytenr, u64 num_bytes, int is_data) | |
e20d96d6 | 2136 | { |
1a5bc167 | 2137 | int err = 0; |
31840ae1 | 2138 | struct extent_buffer *buf; |
8ef97622 | 2139 | |
31840ae1 ZY |
2140 | if (is_data) |
2141 | goto pinit; | |
2142 | ||
2143 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); | |
2144 | if (!buf) | |
2145 | goto pinit; | |
2146 | ||
2147 | /* we can reuse a block if it hasn't been written | |
2148 | * and it is from this transaction. We can't | |
2149 | * reuse anything from the tree log root because | |
2150 | * it has tiny sub-transactions. | |
2151 | */ | |
2152 | if (btrfs_buffer_uptodate(buf, 0) && | |
2153 | btrfs_try_tree_lock(buf)) { | |
2154 | u64 header_owner = btrfs_header_owner(buf); | |
2155 | u64 header_transid = btrfs_header_generation(buf); | |
2156 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && | |
1a40e23b | 2157 | header_owner != BTRFS_TREE_RELOC_OBJECTID && |
56bec294 | 2158 | header_owner != BTRFS_DATA_RELOC_TREE_OBJECTID && |
31840ae1 ZY |
2159 | header_transid == trans->transid && |
2160 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
2161 | clean_tree_block(NULL, root, buf); | |
2162 | btrfs_tree_unlock(buf); | |
5f39d397 | 2163 | free_extent_buffer(buf); |
31840ae1 | 2164 | return 1; |
8ef97622 | 2165 | } |
31840ae1 | 2166 | btrfs_tree_unlock(buf); |
f4b9aa8d | 2167 | } |
31840ae1 ZY |
2168 | free_extent_buffer(buf); |
2169 | pinit: | |
2170 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); | |
2171 | ||
be744175 | 2172 | BUG_ON(err < 0); |
e20d96d6 CM |
2173 | return 0; |
2174 | } | |
2175 | ||
fec577fb | 2176 | /* |
a28ec197 | 2177 | * remove an extent from the root, returns 0 on success |
fec577fb | 2178 | */ |
31840ae1 ZY |
2179 | static int __free_extent(struct btrfs_trans_handle *trans, |
2180 | struct btrfs_root *root, | |
2181 | u64 bytenr, u64 num_bytes, u64 parent, | |
7bb86316 | 2182 | u64 root_objectid, u64 ref_generation, |
56bec294 CM |
2183 | u64 owner_objectid, int pin, int mark_free, |
2184 | int refs_to_drop) | |
a28ec197 | 2185 | { |
5caf2a00 | 2186 | struct btrfs_path *path; |
e2fa7227 | 2187 | struct btrfs_key key; |
1261ec42 CM |
2188 | struct btrfs_fs_info *info = root->fs_info; |
2189 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 2190 | struct extent_buffer *leaf; |
a28ec197 | 2191 | int ret; |
952fccac CM |
2192 | int extent_slot = 0; |
2193 | int found_extent = 0; | |
2194 | int num_to_del = 1; | |
234b63a0 | 2195 | struct btrfs_extent_item *ei; |
cf27e1ee | 2196 | u32 refs; |
037e6390 | 2197 | |
db94535d | 2198 | key.objectid = bytenr; |
62e2749e | 2199 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 2200 | key.offset = num_bytes; |
5caf2a00 | 2201 | path = btrfs_alloc_path(); |
54aa1f4d CM |
2202 | if (!path) |
2203 | return -ENOMEM; | |
5f26f772 | 2204 | |
3c12ac72 | 2205 | path->reada = 1; |
3bb1a1bc YZ |
2206 | ret = lookup_extent_backref(trans, extent_root, path, |
2207 | bytenr, parent, root_objectid, | |
2208 | ref_generation, owner_objectid, 1); | |
7bb86316 | 2209 | if (ret == 0) { |
952fccac CM |
2210 | struct btrfs_key found_key; |
2211 | extent_slot = path->slots[0]; | |
d397712b | 2212 | while (extent_slot > 0) { |
952fccac CM |
2213 | extent_slot--; |
2214 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2215 | extent_slot); | |
2216 | if (found_key.objectid != bytenr) | |
2217 | break; | |
2218 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
2219 | found_key.offset == num_bytes) { | |
2220 | found_extent = 1; | |
2221 | break; | |
2222 | } | |
2223 | if (path->slots[0] - extent_slot > 5) | |
2224 | break; | |
2225 | } | |
31840ae1 | 2226 | if (!found_extent) { |
56bec294 CM |
2227 | ret = remove_extent_backref(trans, extent_root, path, |
2228 | refs_to_drop); | |
31840ae1 ZY |
2229 | BUG_ON(ret); |
2230 | btrfs_release_path(extent_root, path); | |
2231 | ret = btrfs_search_slot(trans, extent_root, | |
2232 | &key, path, -1, 1); | |
f3465ca4 JB |
2233 | if (ret) { |
2234 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
2235 | ", was looking for %llu\n", ret, |
2236 | (unsigned long long)bytenr); | |
f3465ca4 JB |
2237 | btrfs_print_leaf(extent_root, path->nodes[0]); |
2238 | } | |
31840ae1 ZY |
2239 | BUG_ON(ret); |
2240 | extent_slot = path->slots[0]; | |
2241 | } | |
7bb86316 CM |
2242 | } else { |
2243 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
2244 | WARN_ON(1); | |
d397712b | 2245 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
56bec294 | 2246 | "parent %llu root %llu gen %llu owner %llu\n", |
d397712b | 2247 | (unsigned long long)bytenr, |
56bec294 | 2248 | (unsigned long long)parent, |
d397712b CM |
2249 | (unsigned long long)root_objectid, |
2250 | (unsigned long long)ref_generation, | |
2251 | (unsigned long long)owner_objectid); | |
7bb86316 | 2252 | } |
5f39d397 CM |
2253 | |
2254 | leaf = path->nodes[0]; | |
952fccac | 2255 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 2256 | struct btrfs_extent_item); |
5f39d397 | 2257 | refs = btrfs_extent_refs(leaf, ei); |
952fccac | 2258 | |
56bec294 CM |
2259 | /* |
2260 | * we're not allowed to delete the extent item if there | |
2261 | * are other delayed ref updates pending | |
2262 | */ | |
2263 | ||
2264 | BUG_ON(refs < refs_to_drop); | |
2265 | refs -= refs_to_drop; | |
2266 | btrfs_set_extent_refs(leaf, ei, refs); | |
5f39d397 CM |
2267 | btrfs_mark_buffer_dirty(leaf); |
2268 | ||
56bec294 CM |
2269 | if (refs == 0 && found_extent && |
2270 | path->slots[0] == extent_slot + 1) { | |
31840ae1 ZY |
2271 | struct btrfs_extent_ref *ref; |
2272 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
2273 | struct btrfs_extent_ref); | |
56bec294 | 2274 | BUG_ON(btrfs_ref_num_refs(leaf, ref) != refs_to_drop); |
952fccac CM |
2275 | /* if the back ref and the extent are next to each other |
2276 | * they get deleted below in one shot | |
2277 | */ | |
2278 | path->slots[0] = extent_slot; | |
2279 | num_to_del = 2; | |
2280 | } else if (found_extent) { | |
2281 | /* otherwise delete the extent back ref */ | |
56bec294 CM |
2282 | ret = remove_extent_backref(trans, extent_root, path, |
2283 | refs_to_drop); | |
952fccac CM |
2284 | BUG_ON(ret); |
2285 | /* if refs are 0, we need to setup the path for deletion */ | |
2286 | if (refs == 0) { | |
2287 | btrfs_release_path(extent_root, path); | |
2288 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
2289 | -1, 1); | |
952fccac CM |
2290 | BUG_ON(ret); |
2291 | } | |
2292 | } | |
2293 | ||
cf27e1ee | 2294 | if (refs == 0) { |
db94535d CM |
2295 | u64 super_used; |
2296 | u64 root_used; | |
78fae27e CM |
2297 | |
2298 | if (pin) { | |
25179201 | 2299 | mutex_lock(&root->fs_info->pinned_mutex); |
31840ae1 ZY |
2300 | ret = pin_down_bytes(trans, root, bytenr, num_bytes, |
2301 | owner_objectid >= BTRFS_FIRST_FREE_OBJECTID); | |
25179201 | 2302 | mutex_unlock(&root->fs_info->pinned_mutex); |
c549228f Y |
2303 | if (ret > 0) |
2304 | mark_free = 1; | |
2305 | BUG_ON(ret < 0); | |
78fae27e | 2306 | } |
58176a96 | 2307 | /* block accounting for super block */ |
75eff68e | 2308 | spin_lock(&info->delalloc_lock); |
db94535d CM |
2309 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2310 | btrfs_set_super_bytes_used(&info->super_copy, | |
2311 | super_used - num_bytes); | |
58176a96 JB |
2312 | |
2313 | /* block accounting for root item */ | |
db94535d | 2314 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 2315 | btrfs_set_root_used(&root->root_item, |
db94535d | 2316 | root_used - num_bytes); |
34bf63c4 | 2317 | spin_unlock(&info->delalloc_lock); |
952fccac CM |
2318 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
2319 | num_to_del); | |
31840ae1 | 2320 | BUG_ON(ret); |
25179201 | 2321 | btrfs_release_path(extent_root, path); |
21af804c | 2322 | |
459931ec CM |
2323 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
2324 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); | |
2325 | BUG_ON(ret); | |
2326 | } | |
2327 | ||
dcbdd4dc CM |
2328 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
2329 | mark_free); | |
2330 | BUG_ON(ret); | |
a28ec197 | 2331 | } |
5caf2a00 | 2332 | btrfs_free_path(path); |
a28ec197 CM |
2333 | return ret; |
2334 | } | |
2335 | ||
fec577fb CM |
2336 | /* |
2337 | * remove an extent from the root, returns 0 on success | |
2338 | */ | |
925baedd | 2339 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
56bec294 CM |
2340 | struct btrfs_root *root, |
2341 | u64 bytenr, u64 num_bytes, u64 parent, | |
2342 | u64 root_objectid, u64 ref_generation, | |
2343 | u64 owner_objectid, int pin, | |
2344 | int refs_to_drop) | |
fec577fb | 2345 | { |
db94535d | 2346 | WARN_ON(num_bytes < root->sectorsize); |
31840ae1 | 2347 | |
56bec294 CM |
2348 | /* |
2349 | * if metadata always pin | |
2350 | * if data pin when any transaction has committed this | |
2351 | */ | |
2352 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID || | |
2353 | ref_generation != trans->transid) | |
4bef0848 CM |
2354 | pin = 1; |
2355 | ||
4bef0848 CM |
2356 | if (ref_generation != trans->transid) |
2357 | pin = 1; | |
2358 | ||
56bec294 | 2359 | return __free_extent(trans, root, bytenr, num_bytes, parent, |
3bb1a1bc | 2360 | root_objectid, ref_generation, |
56bec294 | 2361 | owner_objectid, pin, pin == 0, refs_to_drop); |
fec577fb CM |
2362 | } |
2363 | ||
925baedd | 2364 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2365 | struct btrfs_root *root, |
2366 | u64 bytenr, u64 num_bytes, u64 parent, | |
2367 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2368 | u64 owner_objectid, int pin) |
925baedd CM |
2369 | { |
2370 | int ret; | |
2371 | ||
56bec294 CM |
2372 | /* |
2373 | * tree log blocks never actually go into the extent allocation | |
2374 | * tree, just update pinning info and exit early. | |
2375 | * | |
2376 | * data extents referenced by the tree log do need to have | |
2377 | * their reference counts bumped. | |
2378 | */ | |
2379 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID && | |
2380 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
2381 | mutex_lock(&root->fs_info->pinned_mutex); | |
2382 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); | |
2383 | mutex_unlock(&root->fs_info->pinned_mutex); | |
2384 | update_reserved_extents(root, bytenr, num_bytes, 0); | |
2385 | ret = 0; | |
2386 | } else { | |
2387 | ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, | |
2388 | root_objectid, ref_generation, | |
2389 | owner_objectid, | |
2390 | BTRFS_DROP_DELAYED_REF, 1); | |
2391 | } | |
925baedd CM |
2392 | return ret; |
2393 | } | |
2394 | ||
87ee04eb CM |
2395 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
2396 | { | |
2397 | u64 mask = ((u64)root->stripesize - 1); | |
2398 | u64 ret = (val + mask) & ~mask; | |
2399 | return ret; | |
2400 | } | |
2401 | ||
fec577fb CM |
2402 | /* |
2403 | * walks the btree of allocated extents and find a hole of a given size. | |
2404 | * The key ins is changed to record the hole: | |
2405 | * ins->objectid == block start | |
62e2749e | 2406 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
2407 | * ins->offset == number of blocks |
2408 | * Any available blocks before search_start are skipped. | |
2409 | */ | |
d397712b | 2410 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
2411 | struct btrfs_root *orig_root, |
2412 | u64 num_bytes, u64 empty_size, | |
2413 | u64 search_start, u64 search_end, | |
2414 | u64 hint_byte, struct btrfs_key *ins, | |
2415 | u64 exclude_start, u64 exclude_nr, | |
2416 | int data) | |
fec577fb | 2417 | { |
80eb234a | 2418 | int ret = 0; |
d397712b | 2419 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
db94535d | 2420 | u64 total_needed = num_bytes; |
239b14b3 | 2421 | u64 *last_ptr = NULL; |
4366211c | 2422 | u64 last_wanted = 0; |
80eb234a | 2423 | struct btrfs_block_group_cache *block_group = NULL; |
0ef3e66b | 2424 | int chunk_alloc_done = 0; |
239b14b3 | 2425 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 2426 | int allowed_chunk_alloc = 0; |
80eb234a JB |
2427 | struct list_head *head = NULL, *cur = NULL; |
2428 | int loop = 0; | |
f5a31e16 | 2429 | int extra_loop = 0; |
80eb234a | 2430 | struct btrfs_space_info *space_info; |
fec577fb | 2431 | |
db94535d | 2432 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 2433 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
2434 | ins->objectid = 0; |
2435 | ins->offset = 0; | |
b1a4d965 | 2436 | |
0ef3e66b CM |
2437 | if (orig_root->ref_cows || empty_size) |
2438 | allowed_chunk_alloc = 1; | |
2439 | ||
239b14b3 CM |
2440 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
2441 | last_ptr = &root->fs_info->last_alloc; | |
536ac8ae CM |
2442 | if (!btrfs_test_opt(root, SSD)) |
2443 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
2444 | } |
2445 | ||
0f9dd46c | 2446 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) |
239b14b3 | 2447 | last_ptr = &root->fs_info->last_data_alloc; |
0f9dd46c | 2448 | |
239b14b3 | 2449 | if (last_ptr) { |
4366211c | 2450 | if (*last_ptr) { |
239b14b3 | 2451 | hint_byte = *last_ptr; |
4366211c CM |
2452 | last_wanted = *last_ptr; |
2453 | } else | |
239b14b3 | 2454 | empty_size += empty_cluster; |
4366211c CM |
2455 | } else { |
2456 | empty_cluster = 0; | |
239b14b3 | 2457 | } |
a061fc8d | 2458 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 2459 | search_start = max(search_start, hint_byte); |
0b86a832 | 2460 | |
42e70e7a | 2461 | if (last_wanted && search_start != last_wanted) { |
4366211c | 2462 | last_wanted = 0; |
42e70e7a CM |
2463 | empty_size += empty_cluster; |
2464 | } | |
4366211c | 2465 | |
42e70e7a | 2466 | total_needed += empty_size; |
80eb234a | 2467 | block_group = btrfs_lookup_block_group(root->fs_info, search_start); |
d899e052 YZ |
2468 | if (!block_group) |
2469 | block_group = btrfs_lookup_first_block_group(root->fs_info, | |
2470 | search_start); | |
80eb234a | 2471 | space_info = __find_space_info(root->fs_info, data); |
0f9dd46c | 2472 | |
80eb234a JB |
2473 | down_read(&space_info->groups_sem); |
2474 | while (1) { | |
2475 | struct btrfs_free_space *free_space; | |
0f9dd46c | 2476 | /* |
80eb234a JB |
2477 | * the only way this happens if our hint points to a block |
2478 | * group thats not of the proper type, while looping this | |
2479 | * should never happen | |
0f9dd46c | 2480 | */ |
8a1413a2 CM |
2481 | if (empty_size) |
2482 | extra_loop = 1; | |
2483 | ||
42e70e7a CM |
2484 | if (!block_group) |
2485 | goto new_group_no_lock; | |
2486 | ||
ea6a478e JB |
2487 | if (unlikely(!block_group->cached)) { |
2488 | mutex_lock(&block_group->cache_mutex); | |
2489 | ret = cache_block_group(root, block_group); | |
2490 | mutex_unlock(&block_group->cache_mutex); | |
2491 | if (ret) | |
2492 | break; | |
2493 | } | |
2494 | ||
25179201 | 2495 | mutex_lock(&block_group->alloc_mutex); |
80eb234a | 2496 | if (unlikely(!block_group_bits(block_group, data))) |
0f9dd46c | 2497 | goto new_group; |
0f9dd46c | 2498 | |
ea6a478e | 2499 | if (unlikely(block_group->ro)) |
80eb234a | 2500 | goto new_group; |
0f9dd46c | 2501 | |
80eb234a JB |
2502 | free_space = btrfs_find_free_space(block_group, search_start, |
2503 | total_needed); | |
2504 | if (free_space) { | |
2505 | u64 start = block_group->key.objectid; | |
2506 | u64 end = block_group->key.objectid + | |
0f9dd46c | 2507 | block_group->key.offset; |
239b14b3 | 2508 | |
80eb234a | 2509 | search_start = stripe_align(root, free_space->offset); |
0f9dd46c | 2510 | |
80eb234a JB |
2511 | /* move on to the next group */ |
2512 | if (search_start + num_bytes >= search_end) | |
2513 | goto new_group; | |
e37c9e69 | 2514 | |
80eb234a JB |
2515 | /* move on to the next group */ |
2516 | if (search_start + num_bytes > end) | |
2517 | goto new_group; | |
2518 | ||
4366211c | 2519 | if (last_wanted && search_start != last_wanted) { |
3b7885bf | 2520 | total_needed += empty_cluster; |
8a1413a2 | 2521 | empty_size += empty_cluster; |
4366211c | 2522 | last_wanted = 0; |
3b7885bf CM |
2523 | /* |
2524 | * if search_start is still in this block group | |
2525 | * then we just re-search this block group | |
2526 | */ | |
2527 | if (search_start >= start && | |
2528 | search_start < end) { | |
2529 | mutex_unlock(&block_group->alloc_mutex); | |
2530 | continue; | |
2531 | } | |
2532 | ||
2533 | /* else we go to the next block group */ | |
2534 | goto new_group; | |
2535 | } | |
2536 | ||
80eb234a JB |
2537 | if (exclude_nr > 0 && |
2538 | (search_start + num_bytes > exclude_start && | |
2539 | search_start < exclude_start + exclude_nr)) { | |
2540 | search_start = exclude_start + exclude_nr; | |
2541 | /* | |
2542 | * if search_start is still in this block group | |
2543 | * then we just re-search this block group | |
2544 | */ | |
2545 | if (search_start >= start && | |
25179201 JB |
2546 | search_start < end) { |
2547 | mutex_unlock(&block_group->alloc_mutex); | |
4366211c | 2548 | last_wanted = 0; |
80eb234a | 2549 | continue; |
25179201 | 2550 | } |
80eb234a JB |
2551 | |
2552 | /* else we go to the next block group */ | |
2553 | goto new_group; | |
2554 | } | |
2555 | ||
2556 | ins->objectid = search_start; | |
2557 | ins->offset = num_bytes; | |
25179201 JB |
2558 | |
2559 | btrfs_remove_free_space_lock(block_group, search_start, | |
2560 | num_bytes); | |
80eb234a | 2561 | /* we are all good, lets return */ |
25179201 | 2562 | mutex_unlock(&block_group->alloc_mutex); |
80eb234a | 2563 | break; |
0f9dd46c | 2564 | } |
80eb234a | 2565 | new_group: |
42e70e7a | 2566 | mutex_unlock(&block_group->alloc_mutex); |
d2fb3437 YZ |
2567 | put_block_group(block_group); |
2568 | block_group = NULL; | |
42e70e7a | 2569 | new_group_no_lock: |
f5a31e16 CM |
2570 | /* don't try to compare new allocations against the |
2571 | * last allocation any more | |
2572 | */ | |
4366211c | 2573 | last_wanted = 0; |
f5a31e16 | 2574 | |
80eb234a JB |
2575 | /* |
2576 | * Here's how this works. | |
2577 | * loop == 0: we were searching a block group via a hint | |
2578 | * and didn't find anything, so we start at | |
2579 | * the head of the block groups and keep searching | |
2580 | * loop == 1: we're searching through all of the block groups | |
2581 | * if we hit the head again we have searched | |
2582 | * all of the block groups for this space and we | |
2583 | * need to try and allocate, if we cant error out. | |
2584 | * loop == 2: we allocated more space and are looping through | |
2585 | * all of the block groups again. | |
2586 | */ | |
2587 | if (loop == 0) { | |
2588 | head = &space_info->block_groups; | |
2589 | cur = head->next; | |
80eb234a JB |
2590 | loop++; |
2591 | } else if (loop == 1 && cur == head) { | |
f5a31e16 CM |
2592 | int keep_going; |
2593 | ||
2594 | /* at this point we give up on the empty_size | |
2595 | * allocations and just try to allocate the min | |
2596 | * space. | |
2597 | * | |
2598 | * The extra_loop field was set if an empty_size | |
2599 | * allocation was attempted above, and if this | |
2600 | * is try we need to try the loop again without | |
2601 | * the additional empty_size. | |
2602 | */ | |
5b7c3fcc CM |
2603 | total_needed -= empty_size; |
2604 | empty_size = 0; | |
f5a31e16 CM |
2605 | keep_going = extra_loop; |
2606 | loop++; | |
42e70e7a | 2607 | |
80eb234a JB |
2608 | if (allowed_chunk_alloc && !chunk_alloc_done) { |
2609 | up_read(&space_info->groups_sem); | |
2610 | ret = do_chunk_alloc(trans, root, num_bytes + | |
2611 | 2 * 1024 * 1024, data, 1); | |
80eb234a | 2612 | down_read(&space_info->groups_sem); |
2ed6d664 CM |
2613 | if (ret < 0) |
2614 | goto loop_check; | |
80eb234a | 2615 | head = &space_info->block_groups; |
f5a31e16 CM |
2616 | /* |
2617 | * we've allocated a new chunk, keep | |
2618 | * trying | |
2619 | */ | |
2620 | keep_going = 1; | |
80eb234a JB |
2621 | chunk_alloc_done = 1; |
2622 | } else if (!allowed_chunk_alloc) { | |
2623 | space_info->force_alloc = 1; | |
f5a31e16 | 2624 | } |
2ed6d664 | 2625 | loop_check: |
f5a31e16 CM |
2626 | if (keep_going) { |
2627 | cur = head->next; | |
2628 | extra_loop = 0; | |
80eb234a JB |
2629 | } else { |
2630 | break; | |
2631 | } | |
2632 | } else if (cur == head) { | |
2633 | break; | |
0f9dd46c | 2634 | } |
0b86a832 | 2635 | |
80eb234a JB |
2636 | block_group = list_entry(cur, struct btrfs_block_group_cache, |
2637 | list); | |
d2fb3437 YZ |
2638 | atomic_inc(&block_group->count); |
2639 | ||
80eb234a JB |
2640 | search_start = block_group->key.objectid; |
2641 | cur = cur->next; | |
f2654de4 | 2642 | } |
0b86a832 | 2643 | |
80eb234a JB |
2644 | /* we found what we needed */ |
2645 | if (ins->objectid) { | |
2646 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
d2fb3437 | 2647 | trans->block_group = block_group->key.objectid; |
0f9dd46c | 2648 | |
80eb234a JB |
2649 | if (last_ptr) |
2650 | *last_ptr = ins->objectid + ins->offset; | |
2651 | ret = 0; | |
2652 | } else if (!ret) { | |
d397712b CM |
2653 | printk(KERN_ERR "btrfs searching for %llu bytes, " |
2654 | "num_bytes %llu, loop %d, allowed_alloc %d\n", | |
2655 | (unsigned long long)total_needed, | |
2656 | (unsigned long long)num_bytes, | |
4ce4cb52 | 2657 | loop, allowed_chunk_alloc); |
80eb234a | 2658 | ret = -ENOSPC; |
be744175 | 2659 | } |
d2fb3437 YZ |
2660 | if (block_group) |
2661 | put_block_group(block_group); | |
be744175 | 2662 | |
80eb234a | 2663 | up_read(&space_info->groups_sem); |
0f70abe2 | 2664 | return ret; |
fec577fb | 2665 | } |
ec44a35c | 2666 | |
0f9dd46c JB |
2667 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes) |
2668 | { | |
2669 | struct btrfs_block_group_cache *cache; | |
0f9dd46c | 2670 | |
d397712b CM |
2671 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
2672 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
2673 | info->bytes_pinned - info->bytes_reserved), | |
2674 | (info->full) ? "" : "not "); | |
6a63209f JB |
2675 | printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu," |
2676 | " may_use=%llu, used=%llu\n", info->total_bytes, | |
2677 | info->bytes_pinned, info->bytes_delalloc, info->bytes_may_use, | |
2678 | info->bytes_used); | |
0f9dd46c | 2679 | |
80eb234a | 2680 | down_read(&info->groups_sem); |
c6e30871 | 2681 | list_for_each_entry(cache, &info->block_groups, list) { |
0f9dd46c | 2682 | spin_lock(&cache->lock); |
d397712b CM |
2683 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
2684 | "%llu pinned %llu reserved\n", | |
2685 | (unsigned long long)cache->key.objectid, | |
2686 | (unsigned long long)cache->key.offset, | |
2687 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
2688 | (unsigned long long)cache->pinned, | |
2689 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
2690 | btrfs_dump_free_space(cache, bytes); |
2691 | spin_unlock(&cache->lock); | |
2692 | } | |
80eb234a | 2693 | up_read(&info->groups_sem); |
0f9dd46c | 2694 | } |
e8569813 | 2695 | |
e6dcd2dc CM |
2696 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
2697 | struct btrfs_root *root, | |
2698 | u64 num_bytes, u64 min_alloc_size, | |
2699 | u64 empty_size, u64 hint_byte, | |
2700 | u64 search_end, struct btrfs_key *ins, | |
2701 | u64 data) | |
fec577fb CM |
2702 | { |
2703 | int ret; | |
fbdc762b | 2704 | u64 search_start = 0; |
1261ec42 | 2705 | struct btrfs_fs_info *info = root->fs_info; |
925baedd | 2706 | |
6a63209f | 2707 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 2708 | again: |
0ef3e66b CM |
2709 | /* |
2710 | * the only place that sets empty_size is btrfs_realloc_node, which | |
2711 | * is not called recursively on allocations | |
2712 | */ | |
2713 | if (empty_size || root->ref_cows) { | |
593060d7 | 2714 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 2715 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
2716 | 2 * 1024 * 1024, |
2717 | BTRFS_BLOCK_GROUP_METADATA | | |
2718 | (info->metadata_alloc_profile & | |
2719 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
2720 | } |
2721 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 2722 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 | 2723 | } |
0b86a832 | 2724 | |
db94535d CM |
2725 | WARN_ON(num_bytes < root->sectorsize); |
2726 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
2727 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
2728 | trans->alloc_exclude_start, |
2729 | trans->alloc_exclude_nr, data); | |
3b951516 | 2730 | |
98d20f67 CM |
2731 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
2732 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 2733 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 2734 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
2735 | do_chunk_alloc(trans, root->fs_info->extent_root, |
2736 | num_bytes, data, 1); | |
98d20f67 CM |
2737 | goto again; |
2738 | } | |
ec44a35c | 2739 | if (ret) { |
0f9dd46c JB |
2740 | struct btrfs_space_info *sinfo; |
2741 | ||
2742 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
2743 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
2744 | "wanted %llu\n", (unsigned long long)data, | |
2745 | (unsigned long long)num_bytes); | |
0f9dd46c | 2746 | dump_space_info(sinfo, num_bytes); |
925baedd | 2747 | BUG(); |
925baedd | 2748 | } |
0f9dd46c JB |
2749 | |
2750 | return ret; | |
e6dcd2dc CM |
2751 | } |
2752 | ||
65b51a00 CM |
2753 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
2754 | { | |
0f9dd46c | 2755 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 2756 | int ret = 0; |
0f9dd46c | 2757 | |
0f9dd46c JB |
2758 | cache = btrfs_lookup_block_group(root->fs_info, start); |
2759 | if (!cache) { | |
d397712b CM |
2760 | printk(KERN_ERR "Unable to find block group for %llu\n", |
2761 | (unsigned long long)start); | |
0f9dd46c JB |
2762 | return -ENOSPC; |
2763 | } | |
1f3c79a2 LH |
2764 | |
2765 | ret = btrfs_discard_extent(root, start, len); | |
2766 | ||
0f9dd46c | 2767 | btrfs_add_free_space(cache, start, len); |
d2fb3437 | 2768 | put_block_group(cache); |
1a40e23b | 2769 | update_reserved_extents(root, start, len, 0); |
1f3c79a2 LH |
2770 | |
2771 | return ret; | |
65b51a00 CM |
2772 | } |
2773 | ||
e6dcd2dc CM |
2774 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
2775 | struct btrfs_root *root, | |
2776 | u64 num_bytes, u64 min_alloc_size, | |
2777 | u64 empty_size, u64 hint_byte, | |
2778 | u64 search_end, struct btrfs_key *ins, | |
2779 | u64 data) | |
2780 | { | |
2781 | int ret; | |
e6dcd2dc CM |
2782 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, |
2783 | empty_size, hint_byte, search_end, ins, | |
2784 | data); | |
e8569813 | 2785 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
e6dcd2dc CM |
2786 | return ret; |
2787 | } | |
2788 | ||
2789 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 2790 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 2791 | u64 root_objectid, u64 ref_generation, |
56bec294 CM |
2792 | u64 owner, struct btrfs_key *ins, |
2793 | int ref_mod) | |
e6dcd2dc CM |
2794 | { |
2795 | int ret; | |
e6dcd2dc CM |
2796 | u64 super_used; |
2797 | u64 root_used; | |
2798 | u64 num_bytes = ins->offset; | |
2799 | u32 sizes[2]; | |
2800 | struct btrfs_fs_info *info = root->fs_info; | |
2801 | struct btrfs_root *extent_root = info->extent_root; | |
2802 | struct btrfs_extent_item *extent_item; | |
2803 | struct btrfs_extent_ref *ref; | |
2804 | struct btrfs_path *path; | |
2805 | struct btrfs_key keys[2]; | |
fec577fb | 2806 | |
31840ae1 ZY |
2807 | if (parent == 0) |
2808 | parent = ins->objectid; | |
2809 | ||
58176a96 | 2810 | /* block accounting for super block */ |
75eff68e | 2811 | spin_lock(&info->delalloc_lock); |
db94535d CM |
2812 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2813 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
26b8003f | 2814 | |
58176a96 | 2815 | /* block accounting for root item */ |
db94535d CM |
2816 | root_used = btrfs_root_used(&root->root_item); |
2817 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
34bf63c4 | 2818 | spin_unlock(&info->delalloc_lock); |
58176a96 | 2819 | |
47e4bb98 | 2820 | memcpy(&keys[0], ins, sizeof(*ins)); |
47e4bb98 CM |
2821 | keys[1].objectid = ins->objectid; |
2822 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 2823 | keys[1].offset = parent; |
47e4bb98 CM |
2824 | sizes[0] = sizeof(*extent_item); |
2825 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
2826 | |
2827 | path = btrfs_alloc_path(); | |
2828 | BUG_ON(!path); | |
47e4bb98 CM |
2829 | |
2830 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, | |
2831 | sizes, 2); | |
ccd467d6 | 2832 | BUG_ON(ret); |
0f9dd46c | 2833 | |
47e4bb98 CM |
2834 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2835 | struct btrfs_extent_item); | |
56bec294 | 2836 | btrfs_set_extent_refs(path->nodes[0], extent_item, ref_mod); |
47e4bb98 CM |
2837 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
2838 | struct btrfs_extent_ref); | |
2839 | ||
2840 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
2841 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
2842 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
56bec294 | 2843 | btrfs_set_ref_num_refs(path->nodes[0], ref, ref_mod); |
47e4bb98 CM |
2844 | |
2845 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2846 | ||
2847 | trans->alloc_exclude_start = 0; | |
2848 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 2849 | btrfs_free_path(path); |
f510cfec | 2850 | |
925baedd CM |
2851 | if (ret) |
2852 | goto out; | |
26b8003f | 2853 | |
d397712b CM |
2854 | ret = update_block_group(trans, root, ins->objectid, |
2855 | ins->offset, 1, 0); | |
f5947066 | 2856 | if (ret) { |
d397712b CM |
2857 | printk(KERN_ERR "btrfs update block group failed for %llu " |
2858 | "%llu\n", (unsigned long long)ins->objectid, | |
2859 | (unsigned long long)ins->offset); | |
f5947066 CM |
2860 | BUG(); |
2861 | } | |
925baedd | 2862 | out: |
e6dcd2dc CM |
2863 | return ret; |
2864 | } | |
2865 | ||
2866 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 2867 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 2868 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2869 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
2870 | { |
2871 | int ret; | |
1c2308f8 CM |
2872 | |
2873 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) | |
2874 | return 0; | |
56bec294 CM |
2875 | |
2876 | ret = btrfs_add_delayed_ref(trans, ins->objectid, | |
2877 | ins->offset, parent, root_objectid, | |
2878 | ref_generation, owner, | |
2879 | BTRFS_ADD_DELAYED_EXTENT, 0); | |
2880 | BUG_ON(ret); | |
e6dcd2dc CM |
2881 | return ret; |
2882 | } | |
e02119d5 CM |
2883 | |
2884 | /* | |
2885 | * this is used by the tree logging recovery code. It records that | |
2886 | * an extent has been allocated and makes sure to clear the free | |
2887 | * space cache bits as well | |
2888 | */ | |
2889 | int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 2890 | struct btrfs_root *root, u64 parent, |
e02119d5 | 2891 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2892 | u64 owner, struct btrfs_key *ins) |
e02119d5 CM |
2893 | { |
2894 | int ret; | |
2895 | struct btrfs_block_group_cache *block_group; | |
2896 | ||
e02119d5 | 2897 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
ea6a478e | 2898 | mutex_lock(&block_group->cache_mutex); |
e02119d5 | 2899 | cache_block_group(root, block_group); |
ea6a478e | 2900 | mutex_unlock(&block_group->cache_mutex); |
e02119d5 | 2901 | |
ea6a478e JB |
2902 | ret = btrfs_remove_free_space(block_group, ins->objectid, |
2903 | ins->offset); | |
0f9dd46c | 2904 | BUG_ON(ret); |
d2fb3437 | 2905 | put_block_group(block_group); |
3bb1a1bc | 2906 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
56bec294 | 2907 | ref_generation, owner, ins, 1); |
e02119d5 CM |
2908 | return ret; |
2909 | } | |
2910 | ||
e6dcd2dc CM |
2911 | /* |
2912 | * finds a free extent and does all the dirty work required for allocation | |
2913 | * returns the key for the extent through ins, and a tree buffer for | |
2914 | * the first block of the extent through buf. | |
2915 | * | |
2916 | * returns 0 if everything worked, non-zero otherwise. | |
2917 | */ | |
2918 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, | |
2919 | struct btrfs_root *root, | |
31840ae1 | 2920 | u64 num_bytes, u64 parent, u64 min_alloc_size, |
e6dcd2dc | 2921 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2922 | u64 owner_objectid, u64 empty_size, u64 hint_byte, |
e6dcd2dc CM |
2923 | u64 search_end, struct btrfs_key *ins, u64 data) |
2924 | { | |
2925 | int ret; | |
e6dcd2dc CM |
2926 | ret = __btrfs_reserve_extent(trans, root, num_bytes, |
2927 | min_alloc_size, empty_size, hint_byte, | |
2928 | search_end, ins, data); | |
2929 | BUG_ON(ret); | |
d00aff00 | 2930 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
56bec294 CM |
2931 | ret = btrfs_add_delayed_ref(trans, ins->objectid, |
2932 | ins->offset, parent, root_objectid, | |
2933 | ref_generation, owner_objectid, | |
2934 | BTRFS_ADD_DELAYED_EXTENT, 0); | |
d00aff00 | 2935 | BUG_ON(ret); |
d00aff00 | 2936 | } |
56bec294 | 2937 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
925baedd | 2938 | return ret; |
fec577fb | 2939 | } |
65b51a00 CM |
2940 | |
2941 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, | |
2942 | struct btrfs_root *root, | |
4008c04a CM |
2943 | u64 bytenr, u32 blocksize, |
2944 | int level) | |
65b51a00 CM |
2945 | { |
2946 | struct extent_buffer *buf; | |
2947 | ||
2948 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
2949 | if (!buf) | |
2950 | return ERR_PTR(-ENOMEM); | |
2951 | btrfs_set_header_generation(buf, trans->transid); | |
4008c04a | 2952 | btrfs_set_buffer_lockdep_class(buf, level); |
65b51a00 CM |
2953 | btrfs_tree_lock(buf); |
2954 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
2955 | |
2956 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 2957 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 2958 | |
d0c803c4 CM |
2959 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
2960 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
2961 | buf->start + buf->len - 1, GFP_NOFS); | |
2962 | } else { | |
2963 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 2964 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 2965 | } |
65b51a00 | 2966 | trans->blocks_used++; |
b4ce94de | 2967 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
2968 | return buf; |
2969 | } | |
2970 | ||
fec577fb CM |
2971 | /* |
2972 | * helper function to allocate a block for a given tree | |
2973 | * returns the tree buffer or NULL. | |
2974 | */ | |
5f39d397 | 2975 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
7bb86316 | 2976 | struct btrfs_root *root, |
31840ae1 | 2977 | u32 blocksize, u64 parent, |
7bb86316 CM |
2978 | u64 root_objectid, |
2979 | u64 ref_generation, | |
7bb86316 CM |
2980 | int level, |
2981 | u64 hint, | |
5f39d397 | 2982 | u64 empty_size) |
fec577fb | 2983 | { |
e2fa7227 | 2984 | struct btrfs_key ins; |
fec577fb | 2985 | int ret; |
5f39d397 | 2986 | struct extent_buffer *buf; |
fec577fb | 2987 | |
31840ae1 | 2988 | ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, |
3bb1a1bc | 2989 | root_objectid, ref_generation, level, |
31840ae1 | 2990 | empty_size, hint, (u64)-1, &ins, 0); |
fec577fb | 2991 | if (ret) { |
54aa1f4d CM |
2992 | BUG_ON(ret > 0); |
2993 | return ERR_PTR(ret); | |
fec577fb | 2994 | } |
55c69072 | 2995 | |
4008c04a CM |
2996 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
2997 | blocksize, level); | |
fec577fb CM |
2998 | return buf; |
2999 | } | |
a28ec197 | 3000 | |
e02119d5 CM |
3001 | int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, |
3002 | struct btrfs_root *root, struct extent_buffer *leaf) | |
6407bf6d | 3003 | { |
7bb86316 CM |
3004 | u64 leaf_owner; |
3005 | u64 leaf_generation; | |
bd56b302 | 3006 | struct refsort *sorted; |
5f39d397 | 3007 | struct btrfs_key key; |
6407bf6d CM |
3008 | struct btrfs_file_extent_item *fi; |
3009 | int i; | |
3010 | int nritems; | |
3011 | int ret; | |
bd56b302 CM |
3012 | int refi = 0; |
3013 | int slot; | |
6407bf6d | 3014 | |
5f39d397 CM |
3015 | BUG_ON(!btrfs_is_leaf(leaf)); |
3016 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
3017 | leaf_owner = btrfs_header_owner(leaf); |
3018 | leaf_generation = btrfs_header_generation(leaf); | |
3019 | ||
bd56b302 CM |
3020 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); |
3021 | /* we do this loop twice. The first time we build a list | |
3022 | * of the extents we have a reference on, then we sort the list | |
3023 | * by bytenr. The second time around we actually do the | |
3024 | * extent freeing. | |
3025 | */ | |
6407bf6d | 3026 | for (i = 0; i < nritems; i++) { |
db94535d | 3027 | u64 disk_bytenr; |
e34a5b4f | 3028 | cond_resched(); |
5f39d397 CM |
3029 | |
3030 | btrfs_item_key_to_cpu(leaf, &key, i); | |
bd56b302 CM |
3031 | |
3032 | /* only extents have references, skip everything else */ | |
5f39d397 | 3033 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
6407bf6d | 3034 | continue; |
bd56b302 | 3035 | |
6407bf6d | 3036 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
bd56b302 CM |
3037 | |
3038 | /* inline extents live in the btree, they don't have refs */ | |
5f39d397 CM |
3039 | if (btrfs_file_extent_type(leaf, fi) == |
3040 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 3041 | continue; |
bd56b302 | 3042 | |
db94535d | 3043 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
bd56b302 CM |
3044 | |
3045 | /* holes don't have refs */ | |
db94535d | 3046 | if (disk_bytenr == 0) |
3a686375 | 3047 | continue; |
4a096752 | 3048 | |
bd56b302 CM |
3049 | sorted[refi].bytenr = disk_bytenr; |
3050 | sorted[refi].slot = i; | |
3051 | refi++; | |
3052 | } | |
3053 | ||
3054 | if (refi == 0) | |
3055 | goto out; | |
3056 | ||
3057 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); | |
3058 | ||
3059 | for (i = 0; i < refi; i++) { | |
3060 | u64 disk_bytenr; | |
3061 | ||
3062 | disk_bytenr = sorted[i].bytenr; | |
3063 | slot = sorted[i].slot; | |
3064 | ||
3065 | cond_resched(); | |
3066 | ||
3067 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
3068 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
3069 | continue; | |
3070 | ||
3071 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
3072 | ||
56bec294 | 3073 | ret = btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 | 3074 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
31840ae1 | 3075 | leaf->start, leaf_owner, leaf_generation, |
3bb1a1bc | 3076 | key.objectid, 0); |
31840ae1 | 3077 | BUG_ON(ret); |
2dd3e67b CM |
3078 | |
3079 | atomic_inc(&root->fs_info->throttle_gen); | |
3080 | wake_up(&root->fs_info->transaction_throttle); | |
3081 | cond_resched(); | |
6407bf6d | 3082 | } |
bd56b302 CM |
3083 | out: |
3084 | kfree(sorted); | |
6407bf6d CM |
3085 | return 0; |
3086 | } | |
3087 | ||
d397712b | 3088 | static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans, |
e02119d5 CM |
3089 | struct btrfs_root *root, |
3090 | struct btrfs_leaf_ref *ref) | |
31153d81 YZ |
3091 | { |
3092 | int i; | |
3093 | int ret; | |
bd56b302 CM |
3094 | struct btrfs_extent_info *info; |
3095 | struct refsort *sorted; | |
3096 | ||
3097 | if (ref->nritems == 0) | |
3098 | return 0; | |
31153d81 | 3099 | |
bd56b302 CM |
3100 | sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS); |
3101 | for (i = 0; i < ref->nritems; i++) { | |
3102 | sorted[i].bytenr = ref->extents[i].bytenr; | |
3103 | sorted[i].slot = i; | |
3104 | } | |
3105 | sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL); | |
3106 | ||
3107 | /* | |
3108 | * the items in the ref were sorted when the ref was inserted | |
3109 | * into the ref cache, so this is already in order | |
3110 | */ | |
31153d81 | 3111 | for (i = 0; i < ref->nritems; i++) { |
bd56b302 | 3112 | info = ref->extents + sorted[i].slot; |
56bec294 | 3113 | ret = btrfs_free_extent(trans, root, info->bytenr, |
31840ae1 ZY |
3114 | info->num_bytes, ref->bytenr, |
3115 | ref->owner, ref->generation, | |
3bb1a1bc | 3116 | info->objectid, 0); |
2dd3e67b CM |
3117 | |
3118 | atomic_inc(&root->fs_info->throttle_gen); | |
3119 | wake_up(&root->fs_info->transaction_throttle); | |
3120 | cond_resched(); | |
3121 | ||
31153d81 YZ |
3122 | BUG_ON(ret); |
3123 | info++; | |
3124 | } | |
31153d81 | 3125 | |
806638bc | 3126 | kfree(sorted); |
31153d81 YZ |
3127 | return 0; |
3128 | } | |
3129 | ||
56bec294 CM |
3130 | static int drop_snap_lookup_refcount(struct btrfs_trans_handle *trans, |
3131 | struct btrfs_root *root, u64 start, | |
d397712b | 3132 | u64 len, u32 *refs) |
333db94c | 3133 | { |
017e5369 | 3134 | int ret; |
f87f057b | 3135 | |
56bec294 | 3136 | ret = btrfs_lookup_extent_ref(trans, root, start, len, refs); |
f87f057b CM |
3137 | BUG_ON(ret); |
3138 | ||
d397712b | 3139 | #if 0 /* some debugging code in case we see problems here */ |
f87f057b CM |
3140 | /* if the refs count is one, it won't get increased again. But |
3141 | * if the ref count is > 1, someone may be decreasing it at | |
3142 | * the same time we are. | |
3143 | */ | |
3144 | if (*refs != 1) { | |
3145 | struct extent_buffer *eb = NULL; | |
3146 | eb = btrfs_find_create_tree_block(root, start, len); | |
3147 | if (eb) | |
3148 | btrfs_tree_lock(eb); | |
3149 | ||
3150 | mutex_lock(&root->fs_info->alloc_mutex); | |
3151 | ret = lookup_extent_ref(NULL, root, start, len, refs); | |
3152 | BUG_ON(ret); | |
3153 | mutex_unlock(&root->fs_info->alloc_mutex); | |
3154 | ||
3155 | if (eb) { | |
3156 | btrfs_tree_unlock(eb); | |
3157 | free_extent_buffer(eb); | |
3158 | } | |
3159 | if (*refs == 1) { | |
d397712b CM |
3160 | printk(KERN_ERR "btrfs block %llu went down to one " |
3161 | "during drop_snap\n", (unsigned long long)start); | |
f87f057b CM |
3162 | } |
3163 | ||
3164 | } | |
3165 | #endif | |
3166 | ||
e7a84565 | 3167 | cond_resched(); |
017e5369 | 3168 | return ret; |
333db94c CM |
3169 | } |
3170 | ||
bd56b302 CM |
3171 | /* |
3172 | * this is used while deleting old snapshots, and it drops the refs | |
3173 | * on a whole subtree starting from a level 1 node. | |
3174 | * | |
3175 | * The idea is to sort all the leaf pointers, and then drop the | |
3176 | * ref on all the leaves in order. Most of the time the leaves | |
3177 | * will have ref cache entries, so no leaf IOs will be required to | |
3178 | * find the extents they have references on. | |
3179 | * | |
3180 | * For each leaf, any references it has are also dropped in order | |
3181 | * | |
3182 | * This ends up dropping the references in something close to optimal | |
3183 | * order for reading and modifying the extent allocation tree. | |
3184 | */ | |
3185 | static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans, | |
3186 | struct btrfs_root *root, | |
3187 | struct btrfs_path *path) | |
3188 | { | |
3189 | u64 bytenr; | |
3190 | u64 root_owner; | |
3191 | u64 root_gen; | |
3192 | struct extent_buffer *eb = path->nodes[1]; | |
3193 | struct extent_buffer *leaf; | |
3194 | struct btrfs_leaf_ref *ref; | |
3195 | struct refsort *sorted = NULL; | |
3196 | int nritems = btrfs_header_nritems(eb); | |
3197 | int ret; | |
3198 | int i; | |
3199 | int refi = 0; | |
3200 | int slot = path->slots[1]; | |
3201 | u32 blocksize = btrfs_level_size(root, 0); | |
3202 | u32 refs; | |
3203 | ||
3204 | if (nritems == 0) | |
3205 | goto out; | |
3206 | ||
3207 | root_owner = btrfs_header_owner(eb); | |
3208 | root_gen = btrfs_header_generation(eb); | |
3209 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); | |
3210 | ||
3211 | /* | |
3212 | * step one, sort all the leaf pointers so we don't scribble | |
3213 | * randomly into the extent allocation tree | |
3214 | */ | |
3215 | for (i = slot; i < nritems; i++) { | |
3216 | sorted[refi].bytenr = btrfs_node_blockptr(eb, i); | |
3217 | sorted[refi].slot = i; | |
3218 | refi++; | |
3219 | } | |
3220 | ||
3221 | /* | |
3222 | * nritems won't be zero, but if we're picking up drop_snapshot | |
3223 | * after a crash, slot might be > 0, so double check things | |
3224 | * just in case. | |
3225 | */ | |
3226 | if (refi == 0) | |
3227 | goto out; | |
3228 | ||
3229 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); | |
3230 | ||
3231 | /* | |
3232 | * the first loop frees everything the leaves point to | |
3233 | */ | |
3234 | for (i = 0; i < refi; i++) { | |
3235 | u64 ptr_gen; | |
3236 | ||
3237 | bytenr = sorted[i].bytenr; | |
3238 | ||
3239 | /* | |
3240 | * check the reference count on this leaf. If it is > 1 | |
3241 | * we just decrement it below and don't update any | |
3242 | * of the refs the leaf points to. | |
3243 | */ | |
56bec294 CM |
3244 | ret = drop_snap_lookup_refcount(trans, root, bytenr, |
3245 | blocksize, &refs); | |
bd56b302 CM |
3246 | BUG_ON(ret); |
3247 | if (refs != 1) | |
3248 | continue; | |
3249 | ||
3250 | ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot); | |
3251 | ||
3252 | /* | |
3253 | * the leaf only had one reference, which means the | |
3254 | * only thing pointing to this leaf is the snapshot | |
3255 | * we're deleting. It isn't possible for the reference | |
3256 | * count to increase again later | |
3257 | * | |
3258 | * The reference cache is checked for the leaf, | |
3259 | * and if found we'll be able to drop any refs held by | |
3260 | * the leaf without needing to read it in. | |
3261 | */ | |
3262 | ref = btrfs_lookup_leaf_ref(root, bytenr); | |
3263 | if (ref && ref->generation != ptr_gen) { | |
3264 | btrfs_free_leaf_ref(root, ref); | |
3265 | ref = NULL; | |
3266 | } | |
3267 | if (ref) { | |
3268 | ret = cache_drop_leaf_ref(trans, root, ref); | |
3269 | BUG_ON(ret); | |
3270 | btrfs_remove_leaf_ref(root, ref); | |
3271 | btrfs_free_leaf_ref(root, ref); | |
3272 | } else { | |
3273 | /* | |
3274 | * the leaf wasn't in the reference cache, so | |
3275 | * we have to read it. | |
3276 | */ | |
3277 | leaf = read_tree_block(root, bytenr, blocksize, | |
3278 | ptr_gen); | |
3279 | ret = btrfs_drop_leaf_ref(trans, root, leaf); | |
3280 | BUG_ON(ret); | |
3281 | free_extent_buffer(leaf); | |
3282 | } | |
3283 | atomic_inc(&root->fs_info->throttle_gen); | |
3284 | wake_up(&root->fs_info->transaction_throttle); | |
3285 | cond_resched(); | |
3286 | } | |
3287 | ||
3288 | /* | |
3289 | * run through the loop again to free the refs on the leaves. | |
3290 | * This is faster than doing it in the loop above because | |
3291 | * the leaves are likely to be clustered together. We end up | |
3292 | * working in nice chunks on the extent allocation tree. | |
3293 | */ | |
3294 | for (i = 0; i < refi; i++) { | |
3295 | bytenr = sorted[i].bytenr; | |
56bec294 | 3296 | ret = btrfs_free_extent(trans, root, bytenr, |
bd56b302 CM |
3297 | blocksize, eb->start, |
3298 | root_owner, root_gen, 0, 1); | |
3299 | BUG_ON(ret); | |
3300 | ||
3301 | atomic_inc(&root->fs_info->throttle_gen); | |
3302 | wake_up(&root->fs_info->transaction_throttle); | |
3303 | cond_resched(); | |
3304 | } | |
3305 | out: | |
3306 | kfree(sorted); | |
3307 | ||
3308 | /* | |
3309 | * update the path to show we've processed the entire level 1 | |
3310 | * node. This will get saved into the root's drop_snapshot_progress | |
3311 | * field so these drops are not repeated again if this transaction | |
3312 | * commits. | |
3313 | */ | |
3314 | path->slots[1] = nritems; | |
3315 | return 0; | |
3316 | } | |
3317 | ||
9aca1d51 CM |
3318 | /* |
3319 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
3320 | * counts as it goes. | |
3321 | */ | |
d397712b | 3322 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
98ed5174 CM |
3323 | struct btrfs_root *root, |
3324 | struct btrfs_path *path, int *level) | |
20524f02 | 3325 | { |
7bb86316 CM |
3326 | u64 root_owner; |
3327 | u64 root_gen; | |
3328 | u64 bytenr; | |
ca7a79ad | 3329 | u64 ptr_gen; |
5f39d397 CM |
3330 | struct extent_buffer *next; |
3331 | struct extent_buffer *cur; | |
7bb86316 | 3332 | struct extent_buffer *parent; |
db94535d | 3333 | u32 blocksize; |
20524f02 CM |
3334 | int ret; |
3335 | u32 refs; | |
3336 | ||
5caf2a00 CM |
3337 | WARN_ON(*level < 0); |
3338 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
56bec294 | 3339 | ret = drop_snap_lookup_refcount(trans, root, path->nodes[*level]->start, |
db94535d | 3340 | path->nodes[*level]->len, &refs); |
20524f02 CM |
3341 | BUG_ON(ret); |
3342 | if (refs > 1) | |
3343 | goto out; | |
e011599b | 3344 | |
9aca1d51 CM |
3345 | /* |
3346 | * walk down to the last node level and free all the leaves | |
3347 | */ | |
d397712b | 3348 | while (*level >= 0) { |
5caf2a00 CM |
3349 | WARN_ON(*level < 0); |
3350 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 3351 | cur = path->nodes[*level]; |
e011599b | 3352 | |
5f39d397 | 3353 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 3354 | WARN_ON(1); |
e011599b | 3355 | |
7518a238 | 3356 | if (path->slots[*level] >= |
5f39d397 | 3357 | btrfs_header_nritems(cur)) |
20524f02 | 3358 | break; |
bd56b302 CM |
3359 | |
3360 | /* the new code goes down to level 1 and does all the | |
3361 | * leaves pointed to that node in bulk. So, this check | |
3362 | * for level 0 will always be false. | |
3363 | * | |
3364 | * But, the disk format allows the drop_snapshot_progress | |
3365 | * field in the root to leave things in a state where | |
3366 | * a leaf will need cleaning up here. If someone crashes | |
3367 | * with the old code and then boots with the new code, | |
3368 | * we might find a leaf here. | |
3369 | */ | |
6407bf6d | 3370 | if (*level == 0) { |
e02119d5 | 3371 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
6407bf6d CM |
3372 | BUG_ON(ret); |
3373 | break; | |
3374 | } | |
bd56b302 CM |
3375 | |
3376 | /* | |
3377 | * once we get to level one, process the whole node | |
3378 | * at once, including everything below it. | |
3379 | */ | |
3380 | if (*level == 1) { | |
3381 | ret = drop_level_one_refs(trans, root, path); | |
3382 | BUG_ON(ret); | |
3383 | break; | |
3384 | } | |
3385 | ||
db94535d | 3386 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
ca7a79ad | 3387 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
db94535d | 3388 | blocksize = btrfs_level_size(root, *level - 1); |
925baedd | 3389 | |
56bec294 CM |
3390 | ret = drop_snap_lookup_refcount(trans, root, bytenr, |
3391 | blocksize, &refs); | |
6407bf6d | 3392 | BUG_ON(ret); |
bd56b302 CM |
3393 | |
3394 | /* | |
3395 | * if there is more than one reference, we don't need | |
3396 | * to read that node to drop any references it has. We | |
3397 | * just drop the ref we hold on that node and move on to the | |
3398 | * next slot in this level. | |
3399 | */ | |
6407bf6d | 3400 | if (refs != 1) { |
7bb86316 CM |
3401 | parent = path->nodes[*level]; |
3402 | root_owner = btrfs_header_owner(parent); | |
3403 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 3404 | path->slots[*level]++; |
f87f057b | 3405 | |
56bec294 | 3406 | ret = btrfs_free_extent(trans, root, bytenr, |
31840ae1 | 3407 | blocksize, parent->start, |
3bb1a1bc YZ |
3408 | root_owner, root_gen, |
3409 | *level - 1, 1); | |
20524f02 | 3410 | BUG_ON(ret); |
18e35e0a CM |
3411 | |
3412 | atomic_inc(&root->fs_info->throttle_gen); | |
3413 | wake_up(&root->fs_info->transaction_throttle); | |
2dd3e67b | 3414 | cond_resched(); |
18e35e0a | 3415 | |
20524f02 CM |
3416 | continue; |
3417 | } | |
bd56b302 | 3418 | |
f87f057b | 3419 | /* |
bd56b302 CM |
3420 | * we need to keep freeing things in the next level down. |
3421 | * read the block and loop around to process it | |
f87f057b | 3422 | */ |
bd56b302 | 3423 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); |
5caf2a00 | 3424 | WARN_ON(*level <= 0); |
83e15a28 | 3425 | if (path->nodes[*level-1]) |
5f39d397 | 3426 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 3427 | path->nodes[*level-1] = next; |
5f39d397 | 3428 | *level = btrfs_header_level(next); |
20524f02 | 3429 | path->slots[*level] = 0; |
2dd3e67b | 3430 | cond_resched(); |
20524f02 CM |
3431 | } |
3432 | out: | |
5caf2a00 CM |
3433 | WARN_ON(*level < 0); |
3434 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
3435 | |
3436 | if (path->nodes[*level] == root->node) { | |
7bb86316 | 3437 | parent = path->nodes[*level]; |
31153d81 | 3438 | bytenr = path->nodes[*level]->start; |
7bb86316 CM |
3439 | } else { |
3440 | parent = path->nodes[*level + 1]; | |
31153d81 | 3441 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
7bb86316 CM |
3442 | } |
3443 | ||
31153d81 YZ |
3444 | blocksize = btrfs_level_size(root, *level); |
3445 | root_owner = btrfs_header_owner(parent); | |
7bb86316 | 3446 | root_gen = btrfs_header_generation(parent); |
31153d81 | 3447 | |
bd56b302 CM |
3448 | /* |
3449 | * cleanup and free the reference on the last node | |
3450 | * we processed | |
3451 | */ | |
56bec294 | 3452 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, |
31840ae1 | 3453 | parent->start, root_owner, root_gen, |
3bb1a1bc | 3454 | *level, 1); |
5f39d397 | 3455 | free_extent_buffer(path->nodes[*level]); |
20524f02 | 3456 | path->nodes[*level] = NULL; |
bd56b302 | 3457 | |
20524f02 CM |
3458 | *level += 1; |
3459 | BUG_ON(ret); | |
f87f057b | 3460 | |
e7a84565 | 3461 | cond_resched(); |
20524f02 CM |
3462 | return 0; |
3463 | } | |
3464 | ||
f82d02d9 YZ |
3465 | /* |
3466 | * helper function for drop_subtree, this function is similar to | |
3467 | * walk_down_tree. The main difference is that it checks reference | |
3468 | * counts while tree blocks are locked. | |
3469 | */ | |
d397712b | 3470 | static noinline int walk_down_subtree(struct btrfs_trans_handle *trans, |
f82d02d9 YZ |
3471 | struct btrfs_root *root, |
3472 | struct btrfs_path *path, int *level) | |
3473 | { | |
3474 | struct extent_buffer *next; | |
3475 | struct extent_buffer *cur; | |
3476 | struct extent_buffer *parent; | |
3477 | u64 bytenr; | |
3478 | u64 ptr_gen; | |
3479 | u32 blocksize; | |
3480 | u32 refs; | |
3481 | int ret; | |
3482 | ||
3483 | cur = path->nodes[*level]; | |
3484 | ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len, | |
3485 | &refs); | |
3486 | BUG_ON(ret); | |
3487 | if (refs > 1) | |
3488 | goto out; | |
3489 | ||
3490 | while (*level >= 0) { | |
3491 | cur = path->nodes[*level]; | |
3492 | if (*level == 0) { | |
3493 | ret = btrfs_drop_leaf_ref(trans, root, cur); | |
3494 | BUG_ON(ret); | |
3495 | clean_tree_block(trans, root, cur); | |
3496 | break; | |
3497 | } | |
3498 | if (path->slots[*level] >= btrfs_header_nritems(cur)) { | |
3499 | clean_tree_block(trans, root, cur); | |
3500 | break; | |
3501 | } | |
3502 | ||
3503 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
3504 | blocksize = btrfs_level_size(root, *level - 1); | |
3505 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
3506 | ||
3507 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); | |
3508 | btrfs_tree_lock(next); | |
b4ce94de | 3509 | btrfs_set_lock_blocking(next); |
f82d02d9 YZ |
3510 | |
3511 | ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize, | |
3512 | &refs); | |
3513 | BUG_ON(ret); | |
3514 | if (refs > 1) { | |
3515 | parent = path->nodes[*level]; | |
3516 | ret = btrfs_free_extent(trans, root, bytenr, | |
3517 | blocksize, parent->start, | |
3518 | btrfs_header_owner(parent), | |
3519 | btrfs_header_generation(parent), | |
3520 | *level - 1, 1); | |
3521 | BUG_ON(ret); | |
3522 | path->slots[*level]++; | |
3523 | btrfs_tree_unlock(next); | |
3524 | free_extent_buffer(next); | |
3525 | continue; | |
3526 | } | |
3527 | ||
3528 | *level = btrfs_header_level(next); | |
3529 | path->nodes[*level] = next; | |
3530 | path->slots[*level] = 0; | |
3531 | path->locks[*level] = 1; | |
3532 | cond_resched(); | |
3533 | } | |
3534 | out: | |
3535 | parent = path->nodes[*level + 1]; | |
3536 | bytenr = path->nodes[*level]->start; | |
3537 | blocksize = path->nodes[*level]->len; | |
3538 | ||
3539 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, | |
3540 | parent->start, btrfs_header_owner(parent), | |
3541 | btrfs_header_generation(parent), *level, 1); | |
3542 | BUG_ON(ret); | |
3543 | ||
3544 | if (path->locks[*level]) { | |
3545 | btrfs_tree_unlock(path->nodes[*level]); | |
3546 | path->locks[*level] = 0; | |
3547 | } | |
3548 | free_extent_buffer(path->nodes[*level]); | |
3549 | path->nodes[*level] = NULL; | |
3550 | *level += 1; | |
3551 | cond_resched(); | |
3552 | return 0; | |
3553 | } | |
3554 | ||
9aca1d51 CM |
3555 | /* |
3556 | * helper for dropping snapshots. This walks back up the tree in the path | |
3557 | * to find the first node higher up where we haven't yet gone through | |
3558 | * all the slots | |
3559 | */ | |
d397712b | 3560 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 3561 | struct btrfs_root *root, |
f82d02d9 YZ |
3562 | struct btrfs_path *path, |
3563 | int *level, int max_level) | |
20524f02 | 3564 | { |
7bb86316 CM |
3565 | u64 root_owner; |
3566 | u64 root_gen; | |
3567 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
3568 | int i; |
3569 | int slot; | |
3570 | int ret; | |
9f3a7427 | 3571 | |
f82d02d9 | 3572 | for (i = *level; i < max_level && path->nodes[i]; i++) { |
20524f02 | 3573 | slot = path->slots[i]; |
5f39d397 CM |
3574 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
3575 | struct extent_buffer *node; | |
3576 | struct btrfs_disk_key disk_key; | |
bd56b302 CM |
3577 | |
3578 | /* | |
3579 | * there is more work to do in this level. | |
3580 | * Update the drop_progress marker to reflect | |
3581 | * the work we've done so far, and then bump | |
3582 | * the slot number | |
3583 | */ | |
5f39d397 | 3584 | node = path->nodes[i]; |
20524f02 CM |
3585 | path->slots[i]++; |
3586 | *level = i; | |
9f3a7427 | 3587 | WARN_ON(*level == 0); |
5f39d397 | 3588 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 3589 | memcpy(&root_item->drop_progress, |
5f39d397 | 3590 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 3591 | root_item->drop_level = i; |
20524f02 CM |
3592 | return 0; |
3593 | } else { | |
31840ae1 | 3594 | struct extent_buffer *parent; |
bd56b302 CM |
3595 | |
3596 | /* | |
3597 | * this whole node is done, free our reference | |
3598 | * on it and go up one level | |
3599 | */ | |
31840ae1 ZY |
3600 | if (path->nodes[*level] == root->node) |
3601 | parent = path->nodes[*level]; | |
3602 | else | |
3603 | parent = path->nodes[*level + 1]; | |
3604 | ||
3605 | root_owner = btrfs_header_owner(parent); | |
3606 | root_gen = btrfs_header_generation(parent); | |
f82d02d9 YZ |
3607 | |
3608 | clean_tree_block(trans, root, path->nodes[*level]); | |
e089f05c | 3609 | ret = btrfs_free_extent(trans, root, |
db94535d | 3610 | path->nodes[*level]->start, |
7bb86316 | 3611 | path->nodes[*level]->len, |
3bb1a1bc YZ |
3612 | parent->start, root_owner, |
3613 | root_gen, *level, 1); | |
6407bf6d | 3614 | BUG_ON(ret); |
f82d02d9 YZ |
3615 | if (path->locks[*level]) { |
3616 | btrfs_tree_unlock(path->nodes[*level]); | |
3617 | path->locks[*level] = 0; | |
3618 | } | |
5f39d397 | 3619 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 3620 | path->nodes[*level] = NULL; |
20524f02 | 3621 | *level = i + 1; |
20524f02 CM |
3622 | } |
3623 | } | |
3624 | return 1; | |
3625 | } | |
3626 | ||
9aca1d51 CM |
3627 | /* |
3628 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
3629 | * the tree freeing any blocks that have a ref count of zero after being | |
3630 | * decremented. | |
3631 | */ | |
e089f05c | 3632 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 3633 | *root) |
20524f02 | 3634 | { |
3768f368 | 3635 | int ret = 0; |
9aca1d51 | 3636 | int wret; |
20524f02 | 3637 | int level; |
5caf2a00 | 3638 | struct btrfs_path *path; |
20524f02 CM |
3639 | int i; |
3640 | int orig_level; | |
9f3a7427 | 3641 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 3642 | |
a2135011 | 3643 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
5caf2a00 CM |
3644 | path = btrfs_alloc_path(); |
3645 | BUG_ON(!path); | |
20524f02 | 3646 | |
5f39d397 | 3647 | level = btrfs_header_level(root->node); |
20524f02 | 3648 | orig_level = level; |
9f3a7427 CM |
3649 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
3650 | path->nodes[level] = root->node; | |
f510cfec | 3651 | extent_buffer_get(root->node); |
9f3a7427 CM |
3652 | path->slots[level] = 0; |
3653 | } else { | |
3654 | struct btrfs_key key; | |
5f39d397 CM |
3655 | struct btrfs_disk_key found_key; |
3656 | struct extent_buffer *node; | |
6702ed49 | 3657 | |
9f3a7427 | 3658 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
3659 | level = root_item->drop_level; |
3660 | path->lowest_level = level; | |
9f3a7427 | 3661 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 3662 | if (wret < 0) { |
9f3a7427 CM |
3663 | ret = wret; |
3664 | goto out; | |
3665 | } | |
5f39d397 CM |
3666 | node = path->nodes[level]; |
3667 | btrfs_node_key(node, &found_key, path->slots[level]); | |
3668 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
3669 | sizeof(found_key))); | |
7d9eb12c CM |
3670 | /* |
3671 | * unlock our path, this is safe because only this | |
3672 | * function is allowed to delete this snapshot | |
3673 | */ | |
925baedd CM |
3674 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
3675 | if (path->nodes[i] && path->locks[i]) { | |
3676 | path->locks[i] = 0; | |
3677 | btrfs_tree_unlock(path->nodes[i]); | |
3678 | } | |
3679 | } | |
9f3a7427 | 3680 | } |
d397712b | 3681 | while (1) { |
5caf2a00 | 3682 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 3683 | if (wret > 0) |
20524f02 | 3684 | break; |
9aca1d51 CM |
3685 | if (wret < 0) |
3686 | ret = wret; | |
3687 | ||
f82d02d9 YZ |
3688 | wret = walk_up_tree(trans, root, path, &level, |
3689 | BTRFS_MAX_LEVEL); | |
9aca1d51 | 3690 | if (wret > 0) |
20524f02 | 3691 | break; |
9aca1d51 CM |
3692 | if (wret < 0) |
3693 | ret = wret; | |
e7a84565 CM |
3694 | if (trans->transaction->in_commit) { |
3695 | ret = -EAGAIN; | |
3696 | break; | |
3697 | } | |
18e35e0a | 3698 | atomic_inc(&root->fs_info->throttle_gen); |
017e5369 | 3699 | wake_up(&root->fs_info->transaction_throttle); |
20524f02 | 3700 | } |
83e15a28 | 3701 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 3702 | if (path->nodes[i]) { |
5f39d397 | 3703 | free_extent_buffer(path->nodes[i]); |
0f82731f | 3704 | path->nodes[i] = NULL; |
83e15a28 | 3705 | } |
20524f02 | 3706 | } |
9f3a7427 | 3707 | out: |
5caf2a00 | 3708 | btrfs_free_path(path); |
9aca1d51 | 3709 | return ret; |
20524f02 | 3710 | } |
9078a3e1 | 3711 | |
f82d02d9 YZ |
3712 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
3713 | struct btrfs_root *root, | |
3714 | struct extent_buffer *node, | |
3715 | struct extent_buffer *parent) | |
3716 | { | |
3717 | struct btrfs_path *path; | |
3718 | int level; | |
3719 | int parent_level; | |
3720 | int ret = 0; | |
3721 | int wret; | |
3722 | ||
3723 | path = btrfs_alloc_path(); | |
3724 | BUG_ON(!path); | |
3725 | ||
b9447ef8 | 3726 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
3727 | parent_level = btrfs_header_level(parent); |
3728 | extent_buffer_get(parent); | |
3729 | path->nodes[parent_level] = parent; | |
3730 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
3731 | ||
b9447ef8 | 3732 | btrfs_assert_tree_locked(node); |
f82d02d9 YZ |
3733 | level = btrfs_header_level(node); |
3734 | extent_buffer_get(node); | |
3735 | path->nodes[level] = node; | |
3736 | path->slots[level] = 0; | |
3737 | ||
3738 | while (1) { | |
3739 | wret = walk_down_subtree(trans, root, path, &level); | |
3740 | if (wret < 0) | |
3741 | ret = wret; | |
3742 | if (wret != 0) | |
3743 | break; | |
3744 | ||
3745 | wret = walk_up_tree(trans, root, path, &level, parent_level); | |
3746 | if (wret < 0) | |
3747 | ret = wret; | |
3748 | if (wret != 0) | |
3749 | break; | |
3750 | } | |
3751 | ||
3752 | btrfs_free_path(path); | |
3753 | return ret; | |
3754 | } | |
3755 | ||
8e7bf94f CM |
3756 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
3757 | unsigned long nr) | |
3758 | { | |
3759 | return min(last, start + nr - 1); | |
3760 | } | |
3761 | ||
d397712b | 3762 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
98ed5174 | 3763 | u64 len) |
edbd8d4e CM |
3764 | { |
3765 | u64 page_start; | |
3766 | u64 page_end; | |
1a40e23b | 3767 | unsigned long first_index; |
edbd8d4e | 3768 | unsigned long last_index; |
edbd8d4e CM |
3769 | unsigned long i; |
3770 | struct page *page; | |
d1310b2e | 3771 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 3772 | struct file_ra_state *ra; |
3eaa2885 | 3773 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
3774 | unsigned int total_read = 0; |
3775 | unsigned int total_dirty = 0; | |
3776 | int ret = 0; | |
4313b399 CM |
3777 | |
3778 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
3779 | |
3780 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 3781 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
3782 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
3783 | ||
1a40e23b ZY |
3784 | /* make sure the dirty trick played by the caller work */ |
3785 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
3786 | first_index, last_index); | |
3787 | if (ret) | |
3788 | goto out_unlock; | |
8e7bf94f | 3789 | |
4313b399 | 3790 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 3791 | |
1a40e23b ZY |
3792 | for (i = first_index ; i <= last_index; i++) { |
3793 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 3794 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 3795 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
3796 | } |
3797 | total_read++; | |
3eaa2885 CM |
3798 | again: |
3799 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 3800 | BUG_ON(1); |
edbd8d4e | 3801 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 3802 | if (!page) { |
1a40e23b | 3803 | ret = -ENOMEM; |
edbd8d4e | 3804 | goto out_unlock; |
a061fc8d | 3805 | } |
edbd8d4e CM |
3806 | if (!PageUptodate(page)) { |
3807 | btrfs_readpage(NULL, page); | |
3808 | lock_page(page); | |
3809 | if (!PageUptodate(page)) { | |
3810 | unlock_page(page); | |
3811 | page_cache_release(page); | |
1a40e23b | 3812 | ret = -EIO; |
edbd8d4e CM |
3813 | goto out_unlock; |
3814 | } | |
3815 | } | |
ec44a35c | 3816 | wait_on_page_writeback(page); |
3eaa2885 | 3817 | |
edbd8d4e CM |
3818 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
3819 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 3820 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 3821 | |
3eaa2885 CM |
3822 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
3823 | if (ordered) { | |
3824 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3825 | unlock_page(page); | |
3826 | page_cache_release(page); | |
3827 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3828 | btrfs_put_ordered_extent(ordered); | |
3829 | goto again; | |
3830 | } | |
3831 | set_page_extent_mapped(page); | |
3832 | ||
1a40e23b ZY |
3833 | if (i == first_index) |
3834 | set_extent_bits(io_tree, page_start, page_end, | |
3835 | EXTENT_BOUNDARY, GFP_NOFS); | |
1f80e4db | 3836 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b | 3837 | |
a061fc8d | 3838 | set_page_dirty(page); |
1a40e23b | 3839 | total_dirty++; |
edbd8d4e | 3840 | |
d1310b2e | 3841 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
3842 | unlock_page(page); |
3843 | page_cache_release(page); | |
3844 | } | |
3845 | ||
3846 | out_unlock: | |
ec44a35c | 3847 | kfree(ra); |
edbd8d4e | 3848 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
3849 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
3850 | return ret; | |
edbd8d4e CM |
3851 | } |
3852 | ||
d397712b | 3853 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
1a40e23b ZY |
3854 | struct btrfs_key *extent_key, |
3855 | u64 offset) | |
3856 | { | |
3857 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
3858 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
3859 | struct extent_map *em; | |
6643558d YZ |
3860 | u64 start = extent_key->objectid - offset; |
3861 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 3862 | |
1a40e23b ZY |
3863 | em = alloc_extent_map(GFP_NOFS); |
3864 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 3865 | |
6643558d | 3866 | em->start = start; |
1a40e23b | 3867 | em->len = extent_key->offset; |
c8b97818 | 3868 | em->block_len = extent_key->offset; |
1a40e23b ZY |
3869 | em->block_start = extent_key->objectid; |
3870 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
3871 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
3872 | ||
3873 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 3874 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
3875 | while (1) { |
3876 | int ret; | |
3877 | spin_lock(&em_tree->lock); | |
3878 | ret = add_extent_mapping(em_tree, em); | |
3879 | spin_unlock(&em_tree->lock); | |
3880 | if (ret != -EEXIST) { | |
3881 | free_extent_map(em); | |
bf4ef679 CM |
3882 | break; |
3883 | } | |
6643558d | 3884 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 3885 | } |
6643558d | 3886 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 3887 | |
6643558d | 3888 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 3889 | } |
edbd8d4e | 3890 | |
1a40e23b ZY |
3891 | struct btrfs_ref_path { |
3892 | u64 extent_start; | |
3893 | u64 nodes[BTRFS_MAX_LEVEL]; | |
3894 | u64 root_objectid; | |
3895 | u64 root_generation; | |
3896 | u64 owner_objectid; | |
1a40e23b ZY |
3897 | u32 num_refs; |
3898 | int lowest_level; | |
3899 | int current_level; | |
f82d02d9 YZ |
3900 | int shared_level; |
3901 | ||
3902 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
3903 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 3904 | }; |
7d9eb12c | 3905 | |
1a40e23b | 3906 | struct disk_extent { |
c8b97818 | 3907 | u64 ram_bytes; |
1a40e23b ZY |
3908 | u64 disk_bytenr; |
3909 | u64 disk_num_bytes; | |
3910 | u64 offset; | |
3911 | u64 num_bytes; | |
c8b97818 CM |
3912 | u8 compression; |
3913 | u8 encryption; | |
3914 | u16 other_encoding; | |
1a40e23b | 3915 | }; |
4313b399 | 3916 | |
1a40e23b ZY |
3917 | static int is_cowonly_root(u64 root_objectid) |
3918 | { | |
3919 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
3920 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
3921 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
3922 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
0403e47e YZ |
3923 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
3924 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1a40e23b ZY |
3925 | return 1; |
3926 | return 0; | |
3927 | } | |
edbd8d4e | 3928 | |
d397712b | 3929 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
3930 | struct btrfs_root *extent_root, |
3931 | struct btrfs_ref_path *ref_path, | |
3932 | int first_time) | |
3933 | { | |
3934 | struct extent_buffer *leaf; | |
3935 | struct btrfs_path *path; | |
3936 | struct btrfs_extent_ref *ref; | |
3937 | struct btrfs_key key; | |
3938 | struct btrfs_key found_key; | |
3939 | u64 bytenr; | |
3940 | u32 nritems; | |
3941 | int level; | |
3942 | int ret = 1; | |
edbd8d4e | 3943 | |
1a40e23b ZY |
3944 | path = btrfs_alloc_path(); |
3945 | if (!path) | |
3946 | return -ENOMEM; | |
bf4ef679 | 3947 | |
1a40e23b ZY |
3948 | if (first_time) { |
3949 | ref_path->lowest_level = -1; | |
3950 | ref_path->current_level = -1; | |
f82d02d9 | 3951 | ref_path->shared_level = -1; |
1a40e23b ZY |
3952 | goto walk_up; |
3953 | } | |
3954 | walk_down: | |
3955 | level = ref_path->current_level - 1; | |
3956 | while (level >= -1) { | |
3957 | u64 parent; | |
3958 | if (level < ref_path->lowest_level) | |
3959 | break; | |
bf4ef679 | 3960 | |
d397712b | 3961 | if (level >= 0) |
1a40e23b | 3962 | bytenr = ref_path->nodes[level]; |
d397712b | 3963 | else |
1a40e23b | 3964 | bytenr = ref_path->extent_start; |
1a40e23b | 3965 | BUG_ON(bytenr == 0); |
bf4ef679 | 3966 | |
1a40e23b ZY |
3967 | parent = ref_path->nodes[level + 1]; |
3968 | ref_path->nodes[level + 1] = 0; | |
3969 | ref_path->current_level = level; | |
3970 | BUG_ON(parent == 0); | |
0ef3e66b | 3971 | |
1a40e23b ZY |
3972 | key.objectid = bytenr; |
3973 | key.offset = parent + 1; | |
3974 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 3975 | |
1a40e23b ZY |
3976 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
3977 | if (ret < 0) | |
edbd8d4e | 3978 | goto out; |
1a40e23b | 3979 | BUG_ON(ret == 0); |
7d9eb12c | 3980 | |
1a40e23b ZY |
3981 | leaf = path->nodes[0]; |
3982 | nritems = btrfs_header_nritems(leaf); | |
3983 | if (path->slots[0] >= nritems) { | |
3984 | ret = btrfs_next_leaf(extent_root, path); | |
3985 | if (ret < 0) | |
3986 | goto out; | |
3987 | if (ret > 0) | |
3988 | goto next; | |
3989 | leaf = path->nodes[0]; | |
3990 | } | |
0ef3e66b | 3991 | |
1a40e23b ZY |
3992 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
3993 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
3994 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
3995 | if (level < ref_path->shared_level) | |
3996 | ref_path->shared_level = level; | |
1a40e23b | 3997 | goto found; |
f82d02d9 | 3998 | } |
1a40e23b ZY |
3999 | next: |
4000 | level--; | |
4001 | btrfs_release_path(extent_root, path); | |
d899e052 | 4002 | cond_resched(); |
1a40e23b ZY |
4003 | } |
4004 | /* reached lowest level */ | |
4005 | ret = 1; | |
4006 | goto out; | |
4007 | walk_up: | |
4008 | level = ref_path->current_level; | |
4009 | while (level < BTRFS_MAX_LEVEL - 1) { | |
4010 | u64 ref_objectid; | |
d397712b CM |
4011 | |
4012 | if (level >= 0) | |
1a40e23b | 4013 | bytenr = ref_path->nodes[level]; |
d397712b | 4014 | else |
1a40e23b | 4015 | bytenr = ref_path->extent_start; |
d397712b | 4016 | |
1a40e23b | 4017 | BUG_ON(bytenr == 0); |
edbd8d4e | 4018 | |
1a40e23b ZY |
4019 | key.objectid = bytenr; |
4020 | key.offset = 0; | |
4021 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 4022 | |
1a40e23b ZY |
4023 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
4024 | if (ret < 0) | |
4025 | goto out; | |
edbd8d4e | 4026 | |
1a40e23b ZY |
4027 | leaf = path->nodes[0]; |
4028 | nritems = btrfs_header_nritems(leaf); | |
4029 | if (path->slots[0] >= nritems) { | |
4030 | ret = btrfs_next_leaf(extent_root, path); | |
4031 | if (ret < 0) | |
4032 | goto out; | |
4033 | if (ret > 0) { | |
4034 | /* the extent was freed by someone */ | |
4035 | if (ref_path->lowest_level == level) | |
4036 | goto out; | |
4037 | btrfs_release_path(extent_root, path); | |
4038 | goto walk_down; | |
4039 | } | |
4040 | leaf = path->nodes[0]; | |
4041 | } | |
edbd8d4e | 4042 | |
1a40e23b ZY |
4043 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
4044 | if (found_key.objectid != bytenr || | |
4045 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
4046 | /* the extent was freed by someone */ | |
4047 | if (ref_path->lowest_level == level) { | |
4048 | ret = 1; | |
4049 | goto out; | |
4050 | } | |
4051 | btrfs_release_path(extent_root, path); | |
4052 | goto walk_down; | |
4053 | } | |
4054 | found: | |
4055 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
4056 | struct btrfs_extent_ref); | |
4057 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
4058 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
4059 | if (first_time) { | |
4060 | level = (int)ref_objectid; | |
4061 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
4062 | ref_path->lowest_level = level; | |
4063 | ref_path->current_level = level; | |
4064 | ref_path->nodes[level] = bytenr; | |
4065 | } else { | |
4066 | WARN_ON(ref_objectid != level); | |
4067 | } | |
4068 | } else { | |
4069 | WARN_ON(level != -1); | |
4070 | } | |
4071 | first_time = 0; | |
bf4ef679 | 4072 | |
1a40e23b ZY |
4073 | if (ref_path->lowest_level == level) { |
4074 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
4075 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
4076 | } | |
bf4ef679 | 4077 | |
7d9eb12c | 4078 | /* |
1a40e23b ZY |
4079 | * the block is tree root or the block isn't in reference |
4080 | * counted tree. | |
7d9eb12c | 4081 | */ |
1a40e23b ZY |
4082 | if (found_key.objectid == found_key.offset || |
4083 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
4084 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4085 | ref_path->root_generation = | |
4086 | btrfs_ref_generation(leaf, ref); | |
4087 | if (level < 0) { | |
4088 | /* special reference from the tree log */ | |
4089 | ref_path->nodes[0] = found_key.offset; | |
4090 | ref_path->current_level = 0; | |
4091 | } | |
4092 | ret = 0; | |
4093 | goto out; | |
4094 | } | |
7d9eb12c | 4095 | |
1a40e23b ZY |
4096 | level++; |
4097 | BUG_ON(ref_path->nodes[level] != 0); | |
4098 | ref_path->nodes[level] = found_key.offset; | |
4099 | ref_path->current_level = level; | |
bf4ef679 | 4100 | |
1a40e23b ZY |
4101 | /* |
4102 | * the reference was created in the running transaction, | |
4103 | * no need to continue walking up. | |
4104 | */ | |
4105 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
4106 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4107 | ref_path->root_generation = | |
4108 | btrfs_ref_generation(leaf, ref); | |
4109 | ret = 0; | |
4110 | goto out; | |
7d9eb12c CM |
4111 | } |
4112 | ||
1a40e23b | 4113 | btrfs_release_path(extent_root, path); |
d899e052 | 4114 | cond_resched(); |
7d9eb12c | 4115 | } |
1a40e23b ZY |
4116 | /* reached max tree level, but no tree root found. */ |
4117 | BUG(); | |
edbd8d4e | 4118 | out: |
1a40e23b ZY |
4119 | btrfs_free_path(path); |
4120 | return ret; | |
edbd8d4e CM |
4121 | } |
4122 | ||
1a40e23b ZY |
4123 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
4124 | struct btrfs_root *extent_root, | |
4125 | struct btrfs_ref_path *ref_path, | |
4126 | u64 extent_start) | |
a061fc8d | 4127 | { |
1a40e23b ZY |
4128 | memset(ref_path, 0, sizeof(*ref_path)); |
4129 | ref_path->extent_start = extent_start; | |
a061fc8d | 4130 | |
1a40e23b | 4131 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
4132 | } |
4133 | ||
1a40e23b ZY |
4134 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
4135 | struct btrfs_root *extent_root, | |
4136 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 4137 | { |
1a40e23b ZY |
4138 | return __next_ref_path(trans, extent_root, ref_path, 0); |
4139 | } | |
4140 | ||
d397712b | 4141 | static noinline int get_new_locations(struct inode *reloc_inode, |
1a40e23b ZY |
4142 | struct btrfs_key *extent_key, |
4143 | u64 offset, int no_fragment, | |
4144 | struct disk_extent **extents, | |
4145 | int *nr_extents) | |
4146 | { | |
4147 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
4148 | struct btrfs_path *path; | |
4149 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 4150 | struct extent_buffer *leaf; |
1a40e23b ZY |
4151 | struct disk_extent *exts = *extents; |
4152 | struct btrfs_key found_key; | |
4153 | u64 cur_pos; | |
4154 | u64 last_byte; | |
edbd8d4e | 4155 | u32 nritems; |
1a40e23b ZY |
4156 | int nr = 0; |
4157 | int max = *nr_extents; | |
4158 | int ret; | |
edbd8d4e | 4159 | |
1a40e23b ZY |
4160 | WARN_ON(!no_fragment && *extents); |
4161 | if (!exts) { | |
4162 | max = 1; | |
4163 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
4164 | if (!exts) | |
4165 | return -ENOMEM; | |
a061fc8d | 4166 | } |
edbd8d4e | 4167 | |
1a40e23b ZY |
4168 | path = btrfs_alloc_path(); |
4169 | BUG_ON(!path); | |
edbd8d4e | 4170 | |
1a40e23b ZY |
4171 | cur_pos = extent_key->objectid - offset; |
4172 | last_byte = extent_key->objectid + extent_key->offset; | |
4173 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
4174 | cur_pos, 0); | |
4175 | if (ret < 0) | |
4176 | goto out; | |
4177 | if (ret > 0) { | |
4178 | ret = -ENOENT; | |
4179 | goto out; | |
4180 | } | |
edbd8d4e | 4181 | |
1a40e23b | 4182 | while (1) { |
edbd8d4e CM |
4183 | leaf = path->nodes[0]; |
4184 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
4185 | if (path->slots[0] >= nritems) { |
4186 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
4187 | if (ret < 0) |
4188 | goto out; | |
1a40e23b ZY |
4189 | if (ret > 0) |
4190 | break; | |
bf4ef679 | 4191 | leaf = path->nodes[0]; |
a061fc8d | 4192 | } |
edbd8d4e CM |
4193 | |
4194 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
4195 | if (found_key.offset != cur_pos || |
4196 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
4197 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
4198 | break; |
4199 | ||
1a40e23b ZY |
4200 | fi = btrfs_item_ptr(leaf, path->slots[0], |
4201 | struct btrfs_file_extent_item); | |
4202 | if (btrfs_file_extent_type(leaf, fi) != | |
4203 | BTRFS_FILE_EXTENT_REG || | |
4204 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 4205 | break; |
1a40e23b ZY |
4206 | |
4207 | if (nr == max) { | |
4208 | struct disk_extent *old = exts; | |
4209 | max *= 2; | |
4210 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
4211 | memcpy(exts, old, sizeof(*exts) * nr); | |
4212 | if (old != *extents) | |
4213 | kfree(old); | |
a061fc8d | 4214 | } |
edbd8d4e | 4215 | |
1a40e23b ZY |
4216 | exts[nr].disk_bytenr = |
4217 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
4218 | exts[nr].disk_num_bytes = | |
4219 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4220 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
4221 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
4222 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
4223 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
4224 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
4225 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
4226 | fi); | |
d899e052 YZ |
4227 | BUG_ON(exts[nr].offset > 0); |
4228 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
4229 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 4230 | |
1a40e23b ZY |
4231 | cur_pos += exts[nr].num_bytes; |
4232 | nr++; | |
4233 | ||
4234 | if (cur_pos + offset >= last_byte) | |
4235 | break; | |
4236 | ||
4237 | if (no_fragment) { | |
4238 | ret = 1; | |
edbd8d4e | 4239 | goto out; |
1a40e23b ZY |
4240 | } |
4241 | path->slots[0]++; | |
4242 | } | |
4243 | ||
1f80e4db | 4244 | BUG_ON(cur_pos + offset > last_byte); |
1a40e23b ZY |
4245 | if (cur_pos + offset < last_byte) { |
4246 | ret = -ENOENT; | |
4247 | goto out; | |
edbd8d4e CM |
4248 | } |
4249 | ret = 0; | |
4250 | out: | |
1a40e23b ZY |
4251 | btrfs_free_path(path); |
4252 | if (ret) { | |
4253 | if (exts != *extents) | |
4254 | kfree(exts); | |
4255 | } else { | |
4256 | *extents = exts; | |
4257 | *nr_extents = nr; | |
4258 | } | |
4259 | return ret; | |
4260 | } | |
4261 | ||
d397712b | 4262 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4263 | struct btrfs_root *root, |
4264 | struct btrfs_path *path, | |
4265 | struct btrfs_key *extent_key, | |
4266 | struct btrfs_key *leaf_key, | |
4267 | struct btrfs_ref_path *ref_path, | |
4268 | struct disk_extent *new_extents, | |
4269 | int nr_extents) | |
4270 | { | |
4271 | struct extent_buffer *leaf; | |
4272 | struct btrfs_file_extent_item *fi; | |
4273 | struct inode *inode = NULL; | |
4274 | struct btrfs_key key; | |
4275 | u64 lock_start = 0; | |
4276 | u64 lock_end = 0; | |
4277 | u64 num_bytes; | |
4278 | u64 ext_offset; | |
86288a19 | 4279 | u64 search_end = (u64)-1; |
1a40e23b | 4280 | u32 nritems; |
3bb1a1bc | 4281 | int nr_scaned = 0; |
1a40e23b | 4282 | int extent_locked = 0; |
d899e052 | 4283 | int extent_type; |
1a40e23b ZY |
4284 | int ret; |
4285 | ||
3bb1a1bc | 4286 | memcpy(&key, leaf_key, sizeof(key)); |
1a40e23b | 4287 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
4288 | if (key.objectid < ref_path->owner_objectid || |
4289 | (key.objectid == ref_path->owner_objectid && | |
4290 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
4291 | key.objectid = ref_path->owner_objectid; | |
4292 | key.type = BTRFS_EXTENT_DATA_KEY; | |
4293 | key.offset = 0; | |
4294 | } | |
1a40e23b ZY |
4295 | } |
4296 | ||
4297 | while (1) { | |
4298 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
4299 | if (ret < 0) | |
4300 | goto out; | |
4301 | ||
4302 | leaf = path->nodes[0]; | |
4303 | nritems = btrfs_header_nritems(leaf); | |
4304 | next: | |
4305 | if (extent_locked && ret > 0) { | |
4306 | /* | |
4307 | * the file extent item was modified by someone | |
4308 | * before the extent got locked. | |
4309 | */ | |
1a40e23b ZY |
4310 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4311 | lock_end, GFP_NOFS); | |
4312 | extent_locked = 0; | |
4313 | } | |
4314 | ||
4315 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 4316 | if (++nr_scaned > 2) |
1a40e23b ZY |
4317 | break; |
4318 | ||
4319 | BUG_ON(extent_locked); | |
4320 | ret = btrfs_next_leaf(root, path); | |
4321 | if (ret < 0) | |
4322 | goto out; | |
4323 | if (ret > 0) | |
4324 | break; | |
4325 | leaf = path->nodes[0]; | |
4326 | nritems = btrfs_header_nritems(leaf); | |
4327 | } | |
4328 | ||
4329 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
4330 | ||
4331 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
4332 | if ((key.objectid > ref_path->owner_objectid) || | |
4333 | (key.objectid == ref_path->owner_objectid && | |
4334 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
86288a19 | 4335 | key.offset >= search_end) |
1a40e23b ZY |
4336 | break; |
4337 | } | |
4338 | ||
4339 | if (inode && key.objectid != inode->i_ino) { | |
4340 | BUG_ON(extent_locked); | |
4341 | btrfs_release_path(root, path); | |
4342 | mutex_unlock(&inode->i_mutex); | |
4343 | iput(inode); | |
4344 | inode = NULL; | |
4345 | continue; | |
4346 | } | |
4347 | ||
4348 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
4349 | path->slots[0]++; | |
4350 | ret = 1; | |
4351 | goto next; | |
4352 | } | |
4353 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4354 | struct btrfs_file_extent_item); | |
d899e052 YZ |
4355 | extent_type = btrfs_file_extent_type(leaf, fi); |
4356 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
4357 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
4358 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
4359 | extent_key->objectid)) { | |
4360 | path->slots[0]++; | |
4361 | ret = 1; | |
4362 | goto next; | |
4363 | } | |
4364 | ||
4365 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4366 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
4367 | ||
86288a19 YZ |
4368 | if (search_end == (u64)-1) { |
4369 | search_end = key.offset - ext_offset + | |
4370 | btrfs_file_extent_ram_bytes(leaf, fi); | |
4371 | } | |
1a40e23b ZY |
4372 | |
4373 | if (!extent_locked) { | |
4374 | lock_start = key.offset; | |
4375 | lock_end = lock_start + num_bytes - 1; | |
4376 | } else { | |
6643558d YZ |
4377 | if (lock_start > key.offset || |
4378 | lock_end + 1 < key.offset + num_bytes) { | |
4379 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4380 | lock_start, lock_end, GFP_NOFS); | |
4381 | extent_locked = 0; | |
4382 | } | |
1a40e23b ZY |
4383 | } |
4384 | ||
4385 | if (!inode) { | |
4386 | btrfs_release_path(root, path); | |
4387 | ||
4388 | inode = btrfs_iget_locked(root->fs_info->sb, | |
4389 | key.objectid, root); | |
4390 | if (inode->i_state & I_NEW) { | |
4391 | BTRFS_I(inode)->root = root; | |
4392 | BTRFS_I(inode)->location.objectid = | |
4393 | key.objectid; | |
4394 | BTRFS_I(inode)->location.type = | |
4395 | BTRFS_INODE_ITEM_KEY; | |
4396 | BTRFS_I(inode)->location.offset = 0; | |
4397 | btrfs_read_locked_inode(inode); | |
4398 | unlock_new_inode(inode); | |
4399 | } | |
4400 | /* | |
4401 | * some code call btrfs_commit_transaction while | |
4402 | * holding the i_mutex, so we can't use mutex_lock | |
4403 | * here. | |
4404 | */ | |
4405 | if (is_bad_inode(inode) || | |
4406 | !mutex_trylock(&inode->i_mutex)) { | |
4407 | iput(inode); | |
4408 | inode = NULL; | |
4409 | key.offset = (u64)-1; | |
4410 | goto skip; | |
4411 | } | |
4412 | } | |
4413 | ||
4414 | if (!extent_locked) { | |
4415 | struct btrfs_ordered_extent *ordered; | |
4416 | ||
4417 | btrfs_release_path(root, path); | |
4418 | ||
4419 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
4420 | lock_end, GFP_NOFS); | |
4421 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
4422 | lock_end); | |
4423 | if (ordered && | |
4424 | ordered->file_offset <= lock_end && | |
4425 | ordered->file_offset + ordered->len > lock_start) { | |
4426 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4427 | lock_start, lock_end, GFP_NOFS); | |
4428 | btrfs_start_ordered_extent(inode, ordered, 1); | |
4429 | btrfs_put_ordered_extent(ordered); | |
4430 | key.offset += num_bytes; | |
4431 | goto skip; | |
4432 | } | |
4433 | if (ordered) | |
4434 | btrfs_put_ordered_extent(ordered); | |
4435 | ||
1a40e23b ZY |
4436 | extent_locked = 1; |
4437 | continue; | |
4438 | } | |
4439 | ||
4440 | if (nr_extents == 1) { | |
4441 | /* update extent pointer in place */ | |
1a40e23b ZY |
4442 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4443 | new_extents[0].disk_bytenr); | |
4444 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4445 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
4446 | btrfs_mark_buffer_dirty(leaf); |
4447 | ||
4448 | btrfs_drop_extent_cache(inode, key.offset, | |
4449 | key.offset + num_bytes - 1, 0); | |
4450 | ||
4451 | ret = btrfs_inc_extent_ref(trans, root, | |
4452 | new_extents[0].disk_bytenr, | |
4453 | new_extents[0].disk_num_bytes, | |
4454 | leaf->start, | |
4455 | root->root_key.objectid, | |
4456 | trans->transid, | |
3bb1a1bc | 4457 | key.objectid); |
1a40e23b ZY |
4458 | BUG_ON(ret); |
4459 | ||
4460 | ret = btrfs_free_extent(trans, root, | |
4461 | extent_key->objectid, | |
4462 | extent_key->offset, | |
4463 | leaf->start, | |
4464 | btrfs_header_owner(leaf), | |
4465 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4466 | key.objectid, 0); |
1a40e23b ZY |
4467 | BUG_ON(ret); |
4468 | ||
4469 | btrfs_release_path(root, path); | |
4470 | key.offset += num_bytes; | |
4471 | } else { | |
d899e052 YZ |
4472 | BUG_ON(1); |
4473 | #if 0 | |
1a40e23b ZY |
4474 | u64 alloc_hint; |
4475 | u64 extent_len; | |
4476 | int i; | |
4477 | /* | |
4478 | * drop old extent pointer at first, then insert the | |
4479 | * new pointers one bye one | |
4480 | */ | |
4481 | btrfs_release_path(root, path); | |
4482 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
4483 | key.offset + num_bytes, | |
4484 | key.offset, &alloc_hint); | |
4485 | BUG_ON(ret); | |
4486 | ||
4487 | for (i = 0; i < nr_extents; i++) { | |
4488 | if (ext_offset >= new_extents[i].num_bytes) { | |
4489 | ext_offset -= new_extents[i].num_bytes; | |
4490 | continue; | |
4491 | } | |
4492 | extent_len = min(new_extents[i].num_bytes - | |
4493 | ext_offset, num_bytes); | |
4494 | ||
4495 | ret = btrfs_insert_empty_item(trans, root, | |
4496 | path, &key, | |
4497 | sizeof(*fi)); | |
4498 | BUG_ON(ret); | |
4499 | ||
4500 | leaf = path->nodes[0]; | |
4501 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4502 | struct btrfs_file_extent_item); | |
4503 | btrfs_set_file_extent_generation(leaf, fi, | |
4504 | trans->transid); | |
4505 | btrfs_set_file_extent_type(leaf, fi, | |
4506 | BTRFS_FILE_EXTENT_REG); | |
4507 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
4508 | new_extents[i].disk_bytenr); | |
4509 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4510 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
4511 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
4512 | new_extents[i].ram_bytes); | |
4513 | ||
4514 | btrfs_set_file_extent_compression(leaf, fi, | |
4515 | new_extents[i].compression); | |
4516 | btrfs_set_file_extent_encryption(leaf, fi, | |
4517 | new_extents[i].encryption); | |
4518 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
4519 | new_extents[i].other_encoding); | |
4520 | ||
1a40e23b ZY |
4521 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4522 | extent_len); | |
4523 | ext_offset += new_extents[i].offset; | |
4524 | btrfs_set_file_extent_offset(leaf, fi, | |
4525 | ext_offset); | |
4526 | btrfs_mark_buffer_dirty(leaf); | |
4527 | ||
4528 | btrfs_drop_extent_cache(inode, key.offset, | |
4529 | key.offset + extent_len - 1, 0); | |
4530 | ||
4531 | ret = btrfs_inc_extent_ref(trans, root, | |
4532 | new_extents[i].disk_bytenr, | |
4533 | new_extents[i].disk_num_bytes, | |
4534 | leaf->start, | |
4535 | root->root_key.objectid, | |
3bb1a1bc | 4536 | trans->transid, key.objectid); |
1a40e23b ZY |
4537 | BUG_ON(ret); |
4538 | btrfs_release_path(root, path); | |
4539 | ||
a76a3cd4 | 4540 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
4541 | |
4542 | ext_offset = 0; | |
4543 | num_bytes -= extent_len; | |
4544 | key.offset += extent_len; | |
4545 | ||
4546 | if (num_bytes == 0) | |
4547 | break; | |
4548 | } | |
4549 | BUG_ON(i >= nr_extents); | |
d899e052 | 4550 | #endif |
1a40e23b ZY |
4551 | } |
4552 | ||
4553 | if (extent_locked) { | |
1a40e23b ZY |
4554 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4555 | lock_end, GFP_NOFS); | |
4556 | extent_locked = 0; | |
4557 | } | |
4558 | skip: | |
4559 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
86288a19 | 4560 | key.offset >= search_end) |
1a40e23b ZY |
4561 | break; |
4562 | ||
4563 | cond_resched(); | |
4564 | } | |
4565 | ret = 0; | |
4566 | out: | |
4567 | btrfs_release_path(root, path); | |
4568 | if (inode) { | |
4569 | mutex_unlock(&inode->i_mutex); | |
4570 | if (extent_locked) { | |
1a40e23b ZY |
4571 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4572 | lock_end, GFP_NOFS); | |
4573 | } | |
4574 | iput(inode); | |
4575 | } | |
4576 | return ret; | |
4577 | } | |
4578 | ||
1a40e23b ZY |
4579 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
4580 | struct btrfs_root *root, | |
4581 | struct extent_buffer *buf, u64 orig_start) | |
4582 | { | |
4583 | int level; | |
4584 | int ret; | |
4585 | ||
4586 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
4587 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
4588 | ||
4589 | level = btrfs_header_level(buf); | |
4590 | if (level == 0) { | |
4591 | struct btrfs_leaf_ref *ref; | |
4592 | struct btrfs_leaf_ref *orig_ref; | |
4593 | ||
4594 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
4595 | if (!orig_ref) | |
4596 | return -ENOENT; | |
4597 | ||
4598 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
4599 | if (!ref) { | |
4600 | btrfs_free_leaf_ref(root, orig_ref); | |
4601 | return -ENOMEM; | |
4602 | } | |
4603 | ||
4604 | ref->nritems = orig_ref->nritems; | |
4605 | memcpy(ref->extents, orig_ref->extents, | |
4606 | sizeof(ref->extents[0]) * ref->nritems); | |
4607 | ||
4608 | btrfs_free_leaf_ref(root, orig_ref); | |
4609 | ||
4610 | ref->root_gen = trans->transid; | |
4611 | ref->bytenr = buf->start; | |
4612 | ref->owner = btrfs_header_owner(buf); | |
4613 | ref->generation = btrfs_header_generation(buf); | |
bd56b302 | 4614 | |
1a40e23b ZY |
4615 | ret = btrfs_add_leaf_ref(root, ref, 0); |
4616 | WARN_ON(ret); | |
4617 | btrfs_free_leaf_ref(root, ref); | |
4618 | } | |
4619 | return 0; | |
4620 | } | |
4621 | ||
d397712b | 4622 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
1a40e23b ZY |
4623 | struct extent_buffer *leaf, |
4624 | struct btrfs_block_group_cache *group, | |
4625 | struct btrfs_root *target_root) | |
4626 | { | |
4627 | struct btrfs_key key; | |
4628 | struct inode *inode = NULL; | |
4629 | struct btrfs_file_extent_item *fi; | |
4630 | u64 num_bytes; | |
4631 | u64 skip_objectid = 0; | |
4632 | u32 nritems; | |
4633 | u32 i; | |
4634 | ||
4635 | nritems = btrfs_header_nritems(leaf); | |
4636 | for (i = 0; i < nritems; i++) { | |
4637 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4638 | if (key.objectid == skip_objectid || | |
4639 | key.type != BTRFS_EXTENT_DATA_KEY) | |
4640 | continue; | |
4641 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4642 | if (btrfs_file_extent_type(leaf, fi) == | |
4643 | BTRFS_FILE_EXTENT_INLINE) | |
4644 | continue; | |
4645 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
4646 | continue; | |
4647 | if (!inode || inode->i_ino != key.objectid) { | |
4648 | iput(inode); | |
4649 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
4650 | key.objectid, target_root, 1); | |
4651 | } | |
4652 | if (!inode) { | |
4653 | skip_objectid = key.objectid; | |
4654 | continue; | |
4655 | } | |
4656 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4657 | ||
4658 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, | |
4659 | key.offset + num_bytes - 1, GFP_NOFS); | |
1a40e23b ZY |
4660 | btrfs_drop_extent_cache(inode, key.offset, |
4661 | key.offset + num_bytes - 1, 1); | |
1a40e23b ZY |
4662 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
4663 | key.offset + num_bytes - 1, GFP_NOFS); | |
4664 | cond_resched(); | |
4665 | } | |
4666 | iput(inode); | |
4667 | return 0; | |
4668 | } | |
4669 | ||
d397712b | 4670 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4671 | struct btrfs_root *root, |
4672 | struct extent_buffer *leaf, | |
4673 | struct btrfs_block_group_cache *group, | |
4674 | struct inode *reloc_inode) | |
4675 | { | |
4676 | struct btrfs_key key; | |
4677 | struct btrfs_key extent_key; | |
4678 | struct btrfs_file_extent_item *fi; | |
4679 | struct btrfs_leaf_ref *ref; | |
4680 | struct disk_extent *new_extent; | |
4681 | u64 bytenr; | |
4682 | u64 num_bytes; | |
4683 | u32 nritems; | |
4684 | u32 i; | |
4685 | int ext_index; | |
4686 | int nr_extent; | |
4687 | int ret; | |
4688 | ||
4689 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
4690 | BUG_ON(!new_extent); | |
4691 | ||
4692 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
4693 | BUG_ON(!ref); | |
4694 | ||
4695 | ext_index = -1; | |
4696 | nritems = btrfs_header_nritems(leaf); | |
4697 | for (i = 0; i < nritems; i++) { | |
4698 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4699 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
4700 | continue; | |
4701 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4702 | if (btrfs_file_extent_type(leaf, fi) == | |
4703 | BTRFS_FILE_EXTENT_INLINE) | |
4704 | continue; | |
4705 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
4706 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4707 | if (bytenr == 0) | |
4708 | continue; | |
4709 | ||
4710 | ext_index++; | |
4711 | if (bytenr >= group->key.objectid + group->key.offset || | |
4712 | bytenr + num_bytes <= group->key.objectid) | |
4713 | continue; | |
4714 | ||
4715 | extent_key.objectid = bytenr; | |
4716 | extent_key.offset = num_bytes; | |
4717 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
4718 | nr_extent = 1; | |
4719 | ret = get_new_locations(reloc_inode, &extent_key, | |
4720 | group->key.objectid, 1, | |
4721 | &new_extent, &nr_extent); | |
4722 | if (ret > 0) | |
4723 | continue; | |
4724 | BUG_ON(ret < 0); | |
4725 | ||
4726 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
4727 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
4728 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
4729 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
4730 | ||
1a40e23b ZY |
4731 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4732 | new_extent->disk_bytenr); | |
4733 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4734 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
4735 | btrfs_mark_buffer_dirty(leaf); |
4736 | ||
4737 | ret = btrfs_inc_extent_ref(trans, root, | |
4738 | new_extent->disk_bytenr, | |
4739 | new_extent->disk_num_bytes, | |
4740 | leaf->start, | |
4741 | root->root_key.objectid, | |
3bb1a1bc | 4742 | trans->transid, key.objectid); |
1a40e23b | 4743 | BUG_ON(ret); |
56bec294 | 4744 | |
1a40e23b ZY |
4745 | ret = btrfs_free_extent(trans, root, |
4746 | bytenr, num_bytes, leaf->start, | |
4747 | btrfs_header_owner(leaf), | |
4748 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4749 | key.objectid, 0); |
1a40e23b ZY |
4750 | BUG_ON(ret); |
4751 | cond_resched(); | |
4752 | } | |
4753 | kfree(new_extent); | |
4754 | BUG_ON(ext_index + 1 != ref->nritems); | |
4755 | btrfs_free_leaf_ref(root, ref); | |
4756 | return 0; | |
4757 | } | |
4758 | ||
f82d02d9 YZ |
4759 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
4760 | struct btrfs_root *root) | |
1a40e23b ZY |
4761 | { |
4762 | struct btrfs_root *reloc_root; | |
f82d02d9 | 4763 | int ret; |
1a40e23b ZY |
4764 | |
4765 | if (root->reloc_root) { | |
4766 | reloc_root = root->reloc_root; | |
4767 | root->reloc_root = NULL; | |
4768 | list_add(&reloc_root->dead_list, | |
4769 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
4770 | |
4771 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
4772 | reloc_root->node->start); | |
4773 | btrfs_set_root_level(&root->root_item, | |
4774 | btrfs_header_level(reloc_root->node)); | |
4775 | memset(&reloc_root->root_item.drop_progress, 0, | |
4776 | sizeof(struct btrfs_disk_key)); | |
4777 | reloc_root->root_item.drop_level = 0; | |
4778 | ||
4779 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4780 | &reloc_root->root_key, | |
4781 | &reloc_root->root_item); | |
4782 | BUG_ON(ret); | |
1a40e23b ZY |
4783 | } |
4784 | return 0; | |
4785 | } | |
4786 | ||
4787 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
4788 | { | |
4789 | struct btrfs_trans_handle *trans; | |
4790 | struct btrfs_root *reloc_root; | |
4791 | struct btrfs_root *prev_root = NULL; | |
4792 | struct list_head dead_roots; | |
4793 | int ret; | |
4794 | unsigned long nr; | |
4795 | ||
4796 | INIT_LIST_HEAD(&dead_roots); | |
4797 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
4798 | ||
4799 | while (!list_empty(&dead_roots)) { | |
4800 | reloc_root = list_entry(dead_roots.prev, | |
4801 | struct btrfs_root, dead_list); | |
4802 | list_del_init(&reloc_root->dead_list); | |
4803 | ||
4804 | BUG_ON(reloc_root->commit_root != NULL); | |
4805 | while (1) { | |
4806 | trans = btrfs_join_transaction(root, 1); | |
4807 | BUG_ON(!trans); | |
4808 | ||
4809 | mutex_lock(&root->fs_info->drop_mutex); | |
4810 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
4811 | if (ret != -EAGAIN) | |
4812 | break; | |
4813 | mutex_unlock(&root->fs_info->drop_mutex); | |
4814 | ||
4815 | nr = trans->blocks_used; | |
4816 | ret = btrfs_end_transaction(trans, root); | |
4817 | BUG_ON(ret); | |
4818 | btrfs_btree_balance_dirty(root, nr); | |
4819 | } | |
4820 | ||
4821 | free_extent_buffer(reloc_root->node); | |
4822 | ||
4823 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
4824 | &reloc_root->root_key); | |
4825 | BUG_ON(ret); | |
4826 | mutex_unlock(&root->fs_info->drop_mutex); | |
4827 | ||
4828 | nr = trans->blocks_used; | |
4829 | ret = btrfs_end_transaction(trans, root); | |
4830 | BUG_ON(ret); | |
4831 | btrfs_btree_balance_dirty(root, nr); | |
4832 | ||
4833 | kfree(prev_root); | |
4834 | prev_root = reloc_root; | |
4835 | } | |
4836 | if (prev_root) { | |
4837 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
4838 | kfree(prev_root); | |
4839 | } | |
4840 | return 0; | |
4841 | } | |
4842 | ||
4843 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
4844 | { | |
4845 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
4846 | return 0; | |
4847 | } | |
4848 | ||
4849 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
4850 | { | |
4851 | struct btrfs_root *reloc_root; | |
4852 | struct btrfs_trans_handle *trans; | |
4853 | struct btrfs_key location; | |
4854 | int found; | |
4855 | int ret; | |
4856 | ||
4857 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
4858 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
4859 | BUG_ON(ret); | |
4860 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
4861 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
4862 | ||
4863 | if (found) { | |
4864 | trans = btrfs_start_transaction(root, 1); | |
4865 | BUG_ON(!trans); | |
4866 | ret = btrfs_commit_transaction(trans, root); | |
4867 | BUG_ON(ret); | |
4868 | } | |
4869 | ||
4870 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
4871 | location.offset = (u64)-1; | |
4872 | location.type = BTRFS_ROOT_ITEM_KEY; | |
4873 | ||
4874 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
4875 | BUG_ON(!reloc_root); | |
4876 | btrfs_orphan_cleanup(reloc_root); | |
4877 | return 0; | |
4878 | } | |
4879 | ||
d397712b | 4880 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4881 | struct btrfs_root *root) |
4882 | { | |
4883 | struct btrfs_root *reloc_root; | |
4884 | struct extent_buffer *eb; | |
4885 | struct btrfs_root_item *root_item; | |
4886 | struct btrfs_key root_key; | |
4887 | int ret; | |
4888 | ||
4889 | BUG_ON(!root->ref_cows); | |
4890 | if (root->reloc_root) | |
4891 | return 0; | |
4892 | ||
4893 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
4894 | BUG_ON(!root_item); | |
4895 | ||
4896 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
4897 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
4898 | BUG_ON(ret); | |
4899 | ||
4900 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
4901 | root_key.offset = root->root_key.objectid; | |
4902 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
4903 | ||
4904 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
4905 | btrfs_set_root_refs(root_item, 0); | |
4906 | btrfs_set_root_bytenr(root_item, eb->start); | |
4907 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 4908 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
4909 | |
4910 | btrfs_tree_unlock(eb); | |
4911 | free_extent_buffer(eb); | |
4912 | ||
4913 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
4914 | &root_key, root_item); | |
4915 | BUG_ON(ret); | |
4916 | kfree(root_item); | |
4917 | ||
4918 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
4919 | &root_key); | |
4920 | BUG_ON(!reloc_root); | |
4921 | reloc_root->last_trans = trans->transid; | |
4922 | reloc_root->commit_root = NULL; | |
4923 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
4924 | ||
4925 | root->reloc_root = reloc_root; | |
4926 | return 0; | |
4927 | } | |
4928 | ||
4929 | /* | |
4930 | * Core function of space balance. | |
4931 | * | |
4932 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
4933 | * counted roots. There is one reloc tree for each subvol, and all |
4934 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
4935 | * of the latest committed roots of subvols (root->commit_root). | |
4936 | * | |
4937 | * To relocate a tree block referenced by a subvol, there are two steps. | |
4938 | * COW the block through subvol's reloc tree, then update block pointer | |
4939 | * in the subvol to point to the new block. Since all reloc trees share | |
4940 | * same root key objectid, doing special handing for tree blocks owned | |
4941 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
4942 | * we can use the resulting new block directly when the same block is | |
4943 | * required to COW again through other reloc trees. By this way, relocated | |
4944 | * tree blocks are shared between reloc trees, so they are also shared | |
4945 | * between subvols. | |
1a40e23b | 4946 | */ |
d397712b | 4947 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4948 | struct btrfs_root *root, |
4949 | struct btrfs_path *path, | |
4950 | struct btrfs_key *first_key, | |
4951 | struct btrfs_ref_path *ref_path, | |
4952 | struct btrfs_block_group_cache *group, | |
4953 | struct inode *reloc_inode) | |
4954 | { | |
4955 | struct btrfs_root *reloc_root; | |
4956 | struct extent_buffer *eb = NULL; | |
4957 | struct btrfs_key *keys; | |
4958 | u64 *nodes; | |
4959 | int level; | |
f82d02d9 | 4960 | int shared_level; |
1a40e23b | 4961 | int lowest_level = 0; |
1a40e23b ZY |
4962 | int ret; |
4963 | ||
4964 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
4965 | lowest_level = ref_path->owner_objectid; | |
4966 | ||
f82d02d9 | 4967 | if (!root->ref_cows) { |
1a40e23b ZY |
4968 | path->lowest_level = lowest_level; |
4969 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
4970 | BUG_ON(ret < 0); | |
4971 | path->lowest_level = 0; | |
4972 | btrfs_release_path(root, path); | |
4973 | return 0; | |
4974 | } | |
4975 | ||
1a40e23b ZY |
4976 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
4977 | ret = init_reloc_tree(trans, root); | |
4978 | BUG_ON(ret); | |
4979 | reloc_root = root->reloc_root; | |
4980 | ||
f82d02d9 YZ |
4981 | shared_level = ref_path->shared_level; |
4982 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 4983 | |
f82d02d9 YZ |
4984 | keys = ref_path->node_keys; |
4985 | nodes = ref_path->new_nodes; | |
4986 | memset(&keys[shared_level + 1], 0, | |
4987 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
4988 | memset(&nodes[shared_level + 1], 0, | |
4989 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 4990 | |
f82d02d9 YZ |
4991 | if (nodes[lowest_level] == 0) { |
4992 | path->lowest_level = lowest_level; | |
4993 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
4994 | 0, 1); | |
4995 | BUG_ON(ret); | |
4996 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
4997 | eb = path->nodes[level]; | |
4998 | if (!eb || eb == reloc_root->node) | |
4999 | break; | |
5000 | nodes[level] = eb->start; | |
5001 | if (level == 0) | |
5002 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
5003 | else | |
5004 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
5005 | } | |
2b82032c YZ |
5006 | if (nodes[0] && |
5007 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
5008 | eb = path->nodes[0]; |
5009 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
5010 | group, reloc_inode); | |
5011 | BUG_ON(ret); | |
5012 | } | |
5013 | btrfs_release_path(reloc_root, path); | |
5014 | } else { | |
1a40e23b | 5015 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 5016 | lowest_level); |
1a40e23b ZY |
5017 | BUG_ON(ret); |
5018 | } | |
5019 | ||
1a40e23b ZY |
5020 | /* |
5021 | * replace tree blocks in the fs tree with tree blocks in | |
5022 | * the reloc tree. | |
5023 | */ | |
5024 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
5025 | BUG_ON(ret < 0); | |
5026 | ||
5027 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
5028 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
5029 | 0, 0); | |
5030 | BUG_ON(ret); | |
5031 | extent_buffer_get(path->nodes[0]); | |
5032 | eb = path->nodes[0]; | |
5033 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
5034 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
5035 | BUG_ON(ret); | |
5036 | free_extent_buffer(eb); | |
5037 | } | |
1a40e23b | 5038 | |
f82d02d9 | 5039 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 5040 | path->lowest_level = 0; |
1a40e23b ZY |
5041 | return 0; |
5042 | } | |
5043 | ||
d397712b | 5044 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5045 | struct btrfs_root *root, |
5046 | struct btrfs_path *path, | |
5047 | struct btrfs_key *first_key, | |
5048 | struct btrfs_ref_path *ref_path) | |
5049 | { | |
5050 | int ret; | |
1a40e23b ZY |
5051 | |
5052 | ret = relocate_one_path(trans, root, path, first_key, | |
5053 | ref_path, NULL, NULL); | |
5054 | BUG_ON(ret); | |
5055 | ||
1a40e23b ZY |
5056 | return 0; |
5057 | } | |
5058 | ||
d397712b | 5059 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5060 | struct btrfs_root *extent_root, |
5061 | struct btrfs_path *path, | |
5062 | struct btrfs_key *extent_key) | |
5063 | { | |
5064 | int ret; | |
5065 | ||
1a40e23b ZY |
5066 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
5067 | if (ret) | |
5068 | goto out; | |
5069 | ret = btrfs_del_item(trans, extent_root, path); | |
5070 | out: | |
5071 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
5072 | return ret; |
5073 | } | |
5074 | ||
d397712b | 5075 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
5076 | struct btrfs_ref_path *ref_path) |
5077 | { | |
5078 | struct btrfs_key root_key; | |
5079 | ||
5080 | root_key.objectid = ref_path->root_objectid; | |
5081 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5082 | if (is_cowonly_root(ref_path->root_objectid)) | |
5083 | root_key.offset = 0; | |
5084 | else | |
5085 | root_key.offset = (u64)-1; | |
5086 | ||
5087 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5088 | } | |
5089 | ||
d397712b | 5090 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
1a40e23b ZY |
5091 | struct btrfs_path *path, |
5092 | struct btrfs_key *extent_key, | |
5093 | struct btrfs_block_group_cache *group, | |
5094 | struct inode *reloc_inode, int pass) | |
5095 | { | |
5096 | struct btrfs_trans_handle *trans; | |
5097 | struct btrfs_root *found_root; | |
5098 | struct btrfs_ref_path *ref_path = NULL; | |
5099 | struct disk_extent *new_extents = NULL; | |
5100 | int nr_extents = 0; | |
5101 | int loops; | |
5102 | int ret; | |
5103 | int level; | |
5104 | struct btrfs_key first_key; | |
5105 | u64 prev_block = 0; | |
5106 | ||
1a40e23b ZY |
5107 | |
5108 | trans = btrfs_start_transaction(extent_root, 1); | |
5109 | BUG_ON(!trans); | |
5110 | ||
5111 | if (extent_key->objectid == 0) { | |
5112 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
5113 | goto out; | |
5114 | } | |
5115 | ||
5116 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
5117 | if (!ref_path) { | |
d397712b CM |
5118 | ret = -ENOMEM; |
5119 | goto out; | |
1a40e23b ZY |
5120 | } |
5121 | ||
5122 | for (loops = 0; ; loops++) { | |
5123 | if (loops == 0) { | |
5124 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
5125 | extent_key->objectid); | |
5126 | } else { | |
5127 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
5128 | } | |
5129 | if (ret < 0) | |
5130 | goto out; | |
5131 | if (ret > 0) | |
5132 | break; | |
5133 | ||
5134 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
5135 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
5136 | continue; | |
5137 | ||
5138 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
5139 | BUG_ON(!found_root); | |
5140 | /* | |
5141 | * for reference counted tree, only process reference paths | |
5142 | * rooted at the latest committed root. | |
5143 | */ | |
5144 | if (found_root->ref_cows && | |
5145 | ref_path->root_generation != found_root->root_key.offset) | |
5146 | continue; | |
5147 | ||
5148 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
5149 | if (pass == 0) { | |
5150 | /* | |
5151 | * copy data extents to new locations | |
5152 | */ | |
5153 | u64 group_start = group->key.objectid; | |
5154 | ret = relocate_data_extent(reloc_inode, | |
5155 | extent_key, | |
5156 | group_start); | |
5157 | if (ret < 0) | |
5158 | goto out; | |
5159 | break; | |
5160 | } | |
5161 | level = 0; | |
5162 | } else { | |
5163 | level = ref_path->owner_objectid; | |
5164 | } | |
5165 | ||
5166 | if (prev_block != ref_path->nodes[level]) { | |
5167 | struct extent_buffer *eb; | |
5168 | u64 block_start = ref_path->nodes[level]; | |
5169 | u64 block_size = btrfs_level_size(found_root, level); | |
5170 | ||
5171 | eb = read_tree_block(found_root, block_start, | |
5172 | block_size, 0); | |
5173 | btrfs_tree_lock(eb); | |
5174 | BUG_ON(level != btrfs_header_level(eb)); | |
5175 | ||
5176 | if (level == 0) | |
5177 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
5178 | else | |
5179 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
5180 | ||
5181 | btrfs_tree_unlock(eb); | |
5182 | free_extent_buffer(eb); | |
5183 | prev_block = block_start; | |
5184 | } | |
5185 | ||
24562425 | 5186 | mutex_lock(&extent_root->fs_info->trans_mutex); |
e4404d6e | 5187 | btrfs_record_root_in_trans(found_root); |
24562425 | 5188 | mutex_unlock(&extent_root->fs_info->trans_mutex); |
e4404d6e YZ |
5189 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
5190 | /* | |
5191 | * try to update data extent references while | |
5192 | * keeping metadata shared between snapshots. | |
5193 | */ | |
5194 | if (pass == 1) { | |
5195 | ret = relocate_one_path(trans, found_root, | |
5196 | path, &first_key, ref_path, | |
5197 | group, reloc_inode); | |
5198 | if (ret < 0) | |
5199 | goto out; | |
5200 | continue; | |
5201 | } | |
1a40e23b ZY |
5202 | /* |
5203 | * use fallback method to process the remaining | |
5204 | * references. | |
5205 | */ | |
5206 | if (!new_extents) { | |
5207 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
5208 | new_extents = kmalloc(sizeof(*new_extents), |
5209 | GFP_NOFS); | |
5210 | nr_extents = 1; | |
1a40e23b ZY |
5211 | ret = get_new_locations(reloc_inode, |
5212 | extent_key, | |
d899e052 | 5213 | group_start, 1, |
1a40e23b ZY |
5214 | &new_extents, |
5215 | &nr_extents); | |
d899e052 | 5216 | if (ret) |
1a40e23b ZY |
5217 | goto out; |
5218 | } | |
1a40e23b ZY |
5219 | ret = replace_one_extent(trans, found_root, |
5220 | path, extent_key, | |
5221 | &first_key, ref_path, | |
5222 | new_extents, nr_extents); | |
e4404d6e | 5223 | } else { |
1a40e23b ZY |
5224 | ret = relocate_tree_block(trans, found_root, path, |
5225 | &first_key, ref_path); | |
1a40e23b ZY |
5226 | } |
5227 | if (ret < 0) | |
5228 | goto out; | |
5229 | } | |
5230 | ret = 0; | |
5231 | out: | |
5232 | btrfs_end_transaction(trans, extent_root); | |
5233 | kfree(new_extents); | |
5234 | kfree(ref_path); | |
1a40e23b ZY |
5235 | return ret; |
5236 | } | |
5237 | ||
ec44a35c CM |
5238 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
5239 | { | |
5240 | u64 num_devices; | |
5241 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
5242 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
5243 | ||
2b82032c | 5244 | num_devices = root->fs_info->fs_devices->rw_devices; |
ec44a35c CM |
5245 | if (num_devices == 1) { |
5246 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5247 | stripped = flags & ~stripped; | |
5248 | ||
5249 | /* turn raid0 into single device chunks */ | |
5250 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
5251 | return stripped; | |
5252 | ||
5253 | /* turn mirroring into duplication */ | |
5254 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
5255 | BTRFS_BLOCK_GROUP_RAID10)) | |
5256 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
5257 | return flags; | |
5258 | } else { | |
5259 | /* they already had raid on here, just return */ | |
ec44a35c CM |
5260 | if (flags & stripped) |
5261 | return flags; | |
5262 | ||
5263 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5264 | stripped = flags & ~stripped; | |
5265 | ||
5266 | /* switch duplicated blocks with raid1 */ | |
5267 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
5268 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
5269 | ||
5270 | /* turn single device chunks into raid0 */ | |
5271 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
5272 | } | |
5273 | return flags; | |
5274 | } | |
5275 | ||
b2950863 | 5276 | static int __alloc_chunk_for_shrink(struct btrfs_root *root, |
0ef3e66b CM |
5277 | struct btrfs_block_group_cache *shrink_block_group, |
5278 | int force) | |
5279 | { | |
5280 | struct btrfs_trans_handle *trans; | |
5281 | u64 new_alloc_flags; | |
5282 | u64 calc; | |
5283 | ||
c286ac48 | 5284 | spin_lock(&shrink_block_group->lock); |
0ef3e66b | 5285 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
c286ac48 | 5286 | spin_unlock(&shrink_block_group->lock); |
c286ac48 | 5287 | |
0ef3e66b | 5288 | trans = btrfs_start_transaction(root, 1); |
c286ac48 | 5289 | spin_lock(&shrink_block_group->lock); |
7d9eb12c | 5290 | |
0ef3e66b CM |
5291 | new_alloc_flags = update_block_group_flags(root, |
5292 | shrink_block_group->flags); | |
5293 | if (new_alloc_flags != shrink_block_group->flags) { | |
5294 | calc = | |
5295 | btrfs_block_group_used(&shrink_block_group->item); | |
5296 | } else { | |
5297 | calc = shrink_block_group->key.offset; | |
5298 | } | |
c286ac48 CM |
5299 | spin_unlock(&shrink_block_group->lock); |
5300 | ||
0ef3e66b CM |
5301 | do_chunk_alloc(trans, root->fs_info->extent_root, |
5302 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
7d9eb12c | 5303 | |
0ef3e66b | 5304 | btrfs_end_transaction(trans, root); |
c286ac48 CM |
5305 | } else |
5306 | spin_unlock(&shrink_block_group->lock); | |
0ef3e66b CM |
5307 | return 0; |
5308 | } | |
5309 | ||
1a40e23b ZY |
5310 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
5311 | struct btrfs_root *root, | |
5312 | u64 objectid, u64 size) | |
5313 | { | |
5314 | struct btrfs_path *path; | |
5315 | struct btrfs_inode_item *item; | |
5316 | struct extent_buffer *leaf; | |
5317 | int ret; | |
5318 | ||
5319 | path = btrfs_alloc_path(); | |
5320 | if (!path) | |
5321 | return -ENOMEM; | |
5322 | ||
5323 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); | |
5324 | if (ret) | |
5325 | goto out; | |
5326 | ||
5327 | leaf = path->nodes[0]; | |
5328 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); | |
5329 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
5330 | btrfs_set_inode_generation(leaf, item, 1); | |
5331 | btrfs_set_inode_size(leaf, item, size); | |
5332 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); | |
0403e47e | 5333 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS); |
1a40e23b ZY |
5334 | btrfs_mark_buffer_dirty(leaf); |
5335 | btrfs_release_path(root, path); | |
5336 | out: | |
5337 | btrfs_free_path(path); | |
5338 | return ret; | |
5339 | } | |
5340 | ||
d397712b | 5341 | static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
5342 | struct btrfs_block_group_cache *group) |
5343 | { | |
5344 | struct inode *inode = NULL; | |
5345 | struct btrfs_trans_handle *trans; | |
5346 | struct btrfs_root *root; | |
5347 | struct btrfs_key root_key; | |
5348 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; | |
5349 | int err = 0; | |
5350 | ||
5351 | root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
5352 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5353 | root_key.offset = (u64)-1; | |
5354 | root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5355 | if (IS_ERR(root)) | |
5356 | return ERR_CAST(root); | |
5357 | ||
5358 | trans = btrfs_start_transaction(root, 1); | |
5359 | BUG_ON(!trans); | |
5360 | ||
5361 | err = btrfs_find_free_objectid(trans, root, objectid, &objectid); | |
5362 | if (err) | |
5363 | goto out; | |
5364 | ||
5365 | err = __insert_orphan_inode(trans, root, objectid, group->key.offset); | |
5366 | BUG_ON(err); | |
5367 | ||
5368 | err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, | |
c8b97818 CM |
5369 | group->key.offset, 0, group->key.offset, |
5370 | 0, 0, 0); | |
1a40e23b ZY |
5371 | BUG_ON(err); |
5372 | ||
5373 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); | |
5374 | if (inode->i_state & I_NEW) { | |
5375 | BTRFS_I(inode)->root = root; | |
5376 | BTRFS_I(inode)->location.objectid = objectid; | |
5377 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
5378 | BTRFS_I(inode)->location.offset = 0; | |
5379 | btrfs_read_locked_inode(inode); | |
5380 | unlock_new_inode(inode); | |
5381 | BUG_ON(is_bad_inode(inode)); | |
5382 | } else { | |
5383 | BUG_ON(1); | |
5384 | } | |
17d217fe | 5385 | BTRFS_I(inode)->index_cnt = group->key.objectid; |
1a40e23b ZY |
5386 | |
5387 | err = btrfs_orphan_add(trans, inode); | |
5388 | out: | |
5389 | btrfs_end_transaction(trans, root); | |
5390 | if (err) { | |
5391 | if (inode) | |
5392 | iput(inode); | |
5393 | inode = ERR_PTR(err); | |
5394 | } | |
5395 | return inode; | |
5396 | } | |
5397 | ||
17d217fe YZ |
5398 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) |
5399 | { | |
5400 | ||
5401 | struct btrfs_ordered_sum *sums; | |
5402 | struct btrfs_sector_sum *sector_sum; | |
5403 | struct btrfs_ordered_extent *ordered; | |
5404 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5405 | struct list_head list; | |
5406 | size_t offset; | |
5407 | int ret; | |
5408 | u64 disk_bytenr; | |
5409 | ||
5410 | INIT_LIST_HEAD(&list); | |
5411 | ||
5412 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); | |
5413 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); | |
5414 | ||
5415 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; | |
07d400a6 | 5416 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, |
17d217fe YZ |
5417 | disk_bytenr + len - 1, &list); |
5418 | ||
5419 | while (!list_empty(&list)) { | |
5420 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
5421 | list_del_init(&sums->list); | |
5422 | ||
5423 | sector_sum = sums->sums; | |
5424 | sums->bytenr = ordered->start; | |
5425 | ||
5426 | offset = 0; | |
5427 | while (offset < sums->len) { | |
5428 | sector_sum->bytenr += ordered->start - disk_bytenr; | |
5429 | sector_sum++; | |
5430 | offset += root->sectorsize; | |
5431 | } | |
5432 | ||
5433 | btrfs_add_ordered_sum(inode, ordered, sums); | |
5434 | } | |
5435 | btrfs_put_ordered_extent(ordered); | |
5436 | return 0; | |
5437 | } | |
5438 | ||
1a40e23b | 5439 | int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start) |
edbd8d4e CM |
5440 | { |
5441 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 5442 | struct btrfs_path *path; |
1a40e23b ZY |
5443 | struct btrfs_fs_info *info = root->fs_info; |
5444 | struct extent_buffer *leaf; | |
5445 | struct inode *reloc_inode; | |
5446 | struct btrfs_block_group_cache *block_group; | |
5447 | struct btrfs_key key; | |
d899e052 | 5448 | u64 skipped; |
edbd8d4e CM |
5449 | u64 cur_byte; |
5450 | u64 total_found; | |
edbd8d4e CM |
5451 | u32 nritems; |
5452 | int ret; | |
a061fc8d | 5453 | int progress; |
1a40e23b | 5454 | int pass = 0; |
edbd8d4e | 5455 | |
1a40e23b ZY |
5456 | root = root->fs_info->extent_root; |
5457 | ||
5458 | block_group = btrfs_lookup_block_group(info, group_start); | |
5459 | BUG_ON(!block_group); | |
8f18cf13 | 5460 | |
d397712b | 5461 | printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n", |
1a40e23b ZY |
5462 | (unsigned long long)block_group->key.objectid, |
5463 | (unsigned long long)block_group->flags); | |
8f18cf13 | 5464 | |
edbd8d4e | 5465 | path = btrfs_alloc_path(); |
1a40e23b | 5466 | BUG_ON(!path); |
edbd8d4e | 5467 | |
1a40e23b ZY |
5468 | reloc_inode = create_reloc_inode(info, block_group); |
5469 | BUG_ON(IS_ERR(reloc_inode)); | |
323da79c | 5470 | |
1a40e23b | 5471 | __alloc_chunk_for_shrink(root, block_group, 1); |
c146afad | 5472 | set_block_group_readonly(block_group); |
323da79c | 5473 | |
1a40e23b ZY |
5474 | btrfs_start_delalloc_inodes(info->tree_root); |
5475 | btrfs_wait_ordered_extents(info->tree_root, 0); | |
5476 | again: | |
d899e052 | 5477 | skipped = 0; |
edbd8d4e | 5478 | total_found = 0; |
a061fc8d | 5479 | progress = 0; |
1a40e23b | 5480 | key.objectid = block_group->key.objectid; |
edbd8d4e CM |
5481 | key.offset = 0; |
5482 | key.type = 0; | |
73e48b27 | 5483 | cur_byte = key.objectid; |
4313b399 | 5484 | |
1a40e23b ZY |
5485 | trans = btrfs_start_transaction(info->tree_root, 1); |
5486 | btrfs_commit_transaction(trans, info->tree_root); | |
ea8c2819 | 5487 | |
1a40e23b ZY |
5488 | mutex_lock(&root->fs_info->cleaner_mutex); |
5489 | btrfs_clean_old_snapshots(info->tree_root); | |
5490 | btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1); | |
5491 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
ea8c2819 | 5492 | |
56bec294 CM |
5493 | trans = btrfs_start_transaction(info->tree_root, 1); |
5494 | btrfs_commit_transaction(trans, info->tree_root); | |
5495 | ||
d397712b | 5496 | while (1) { |
edbd8d4e CM |
5497 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5498 | if (ret < 0) | |
5499 | goto out; | |
7d9eb12c | 5500 | next: |
edbd8d4e | 5501 | leaf = path->nodes[0]; |
73e48b27 | 5502 | nritems = btrfs_header_nritems(leaf); |
73e48b27 Y |
5503 | if (path->slots[0] >= nritems) { |
5504 | ret = btrfs_next_leaf(root, path); | |
5505 | if (ret < 0) | |
5506 | goto out; | |
5507 | if (ret == 1) { | |
5508 | ret = 0; | |
5509 | break; | |
edbd8d4e | 5510 | } |
73e48b27 Y |
5511 | leaf = path->nodes[0]; |
5512 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 5513 | } |
73e48b27 | 5514 | |
1a40e23b | 5515 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
725c8463 | 5516 | |
1a40e23b ZY |
5517 | if (key.objectid >= block_group->key.objectid + |
5518 | block_group->key.offset) | |
8f18cf13 CM |
5519 | break; |
5520 | ||
725c8463 | 5521 | if (progress && need_resched()) { |
725c8463 | 5522 | btrfs_release_path(root, path); |
1a40e23b | 5523 | cond_resched(); |
725c8463 | 5524 | progress = 0; |
1a40e23b | 5525 | continue; |
725c8463 CM |
5526 | } |
5527 | progress = 1; | |
5528 | ||
1a40e23b ZY |
5529 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY || |
5530 | key.objectid + key.offset <= cur_byte) { | |
edbd8d4e | 5531 | path->slots[0]++; |
edbd8d4e CM |
5532 | goto next; |
5533 | } | |
73e48b27 | 5534 | |
edbd8d4e | 5535 | total_found++; |
1a40e23b | 5536 | cur_byte = key.objectid + key.offset; |
edbd8d4e | 5537 | btrfs_release_path(root, path); |
edbd8d4e | 5538 | |
1a40e23b ZY |
5539 | __alloc_chunk_for_shrink(root, block_group, 0); |
5540 | ret = relocate_one_extent(root, path, &key, block_group, | |
5541 | reloc_inode, pass); | |
5542 | BUG_ON(ret < 0); | |
d899e052 YZ |
5543 | if (ret > 0) |
5544 | skipped++; | |
edbd8d4e | 5545 | |
1a40e23b ZY |
5546 | key.objectid = cur_byte; |
5547 | key.type = 0; | |
5548 | key.offset = 0; | |
edbd8d4e CM |
5549 | } |
5550 | ||
1a40e23b | 5551 | btrfs_release_path(root, path); |
7d9eb12c | 5552 | |
1a40e23b ZY |
5553 | if (pass == 0) { |
5554 | btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1); | |
5555 | invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1); | |
8e8a1e31 | 5556 | } |
73e48b27 | 5557 | |
1a40e23b | 5558 | if (total_found > 0) { |
d397712b | 5559 | printk(KERN_INFO "btrfs found %llu extents in pass %d\n", |
1a40e23b ZY |
5560 | (unsigned long long)total_found, pass); |
5561 | pass++; | |
d899e052 YZ |
5562 | if (total_found == skipped && pass > 2) { |
5563 | iput(reloc_inode); | |
5564 | reloc_inode = create_reloc_inode(info, block_group); | |
5565 | pass = 0; | |
5566 | } | |
1a40e23b | 5567 | goto again; |
0f9dd46c | 5568 | } |
0ef3e66b | 5569 | |
1a40e23b ZY |
5570 | /* delete reloc_inode */ |
5571 | iput(reloc_inode); | |
5572 | ||
5573 | /* unpin extents in this range */ | |
5574 | trans = btrfs_start_transaction(info->tree_root, 1); | |
5575 | btrfs_commit_transaction(trans, info->tree_root); | |
0ef3e66b | 5576 | |
1a40e23b ZY |
5577 | spin_lock(&block_group->lock); |
5578 | WARN_ON(block_group->pinned > 0); | |
5579 | WARN_ON(block_group->reserved > 0); | |
5580 | WARN_ON(btrfs_block_group_used(&block_group->item) > 0); | |
5581 | spin_unlock(&block_group->lock); | |
d2fb3437 | 5582 | put_block_group(block_group); |
1a40e23b | 5583 | ret = 0; |
edbd8d4e | 5584 | out: |
1a40e23b | 5585 | btrfs_free_path(path); |
edbd8d4e CM |
5586 | return ret; |
5587 | } | |
5588 | ||
b2950863 CH |
5589 | static int find_first_block_group(struct btrfs_root *root, |
5590 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 5591 | { |
925baedd | 5592 | int ret = 0; |
0b86a832 CM |
5593 | struct btrfs_key found_key; |
5594 | struct extent_buffer *leaf; | |
5595 | int slot; | |
edbd8d4e | 5596 | |
0b86a832 CM |
5597 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
5598 | if (ret < 0) | |
925baedd CM |
5599 | goto out; |
5600 | ||
d397712b | 5601 | while (1) { |
0b86a832 | 5602 | slot = path->slots[0]; |
edbd8d4e | 5603 | leaf = path->nodes[0]; |
0b86a832 CM |
5604 | if (slot >= btrfs_header_nritems(leaf)) { |
5605 | ret = btrfs_next_leaf(root, path); | |
5606 | if (ret == 0) | |
5607 | continue; | |
5608 | if (ret < 0) | |
925baedd | 5609 | goto out; |
0b86a832 | 5610 | break; |
edbd8d4e | 5611 | } |
0b86a832 | 5612 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 5613 | |
0b86a832 | 5614 | if (found_key.objectid >= key->objectid && |
925baedd CM |
5615 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5616 | ret = 0; | |
5617 | goto out; | |
5618 | } | |
0b86a832 | 5619 | path->slots[0]++; |
edbd8d4e | 5620 | } |
0b86a832 | 5621 | ret = -ENOENT; |
925baedd | 5622 | out: |
0b86a832 | 5623 | return ret; |
edbd8d4e CM |
5624 | } |
5625 | ||
1a40e23b ZY |
5626 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
5627 | { | |
5628 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 5629 | struct btrfs_space_info *space_info; |
1a40e23b ZY |
5630 | struct rb_node *n; |
5631 | ||
1a40e23b ZY |
5632 | spin_lock(&info->block_group_cache_lock); |
5633 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
5634 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
5635 | cache_node); | |
1a40e23b ZY |
5636 | rb_erase(&block_group->cache_node, |
5637 | &info->block_group_cache_tree); | |
d899e052 YZ |
5638 | spin_unlock(&info->block_group_cache_lock); |
5639 | ||
5640 | btrfs_remove_free_space_cache(block_group); | |
80eb234a | 5641 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5642 | list_del(&block_group->list); |
80eb234a | 5643 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 YZ |
5644 | |
5645 | WARN_ON(atomic_read(&block_group->count) != 1); | |
1a40e23b | 5646 | kfree(block_group); |
d899e052 YZ |
5647 | |
5648 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
5649 | } |
5650 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
5651 | |
5652 | /* now that all the block groups are freed, go through and | |
5653 | * free all the space_info structs. This is only called during | |
5654 | * the final stages of unmount, and so we know nobody is | |
5655 | * using them. We call synchronize_rcu() once before we start, | |
5656 | * just to be on the safe side. | |
5657 | */ | |
5658 | synchronize_rcu(); | |
5659 | ||
5660 | while(!list_empty(&info->space_info)) { | |
5661 | space_info = list_entry(info->space_info.next, | |
5662 | struct btrfs_space_info, | |
5663 | list); | |
5664 | ||
5665 | list_del(&space_info->list); | |
5666 | kfree(space_info); | |
5667 | } | |
1a40e23b ZY |
5668 | return 0; |
5669 | } | |
5670 | ||
9078a3e1 CM |
5671 | int btrfs_read_block_groups(struct btrfs_root *root) |
5672 | { | |
5673 | struct btrfs_path *path; | |
5674 | int ret; | |
9078a3e1 | 5675 | struct btrfs_block_group_cache *cache; |
be744175 | 5676 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 5677 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
5678 | struct btrfs_key key; |
5679 | struct btrfs_key found_key; | |
5f39d397 | 5680 | struct extent_buffer *leaf; |
96b5179d | 5681 | |
be744175 | 5682 | root = info->extent_root; |
9078a3e1 | 5683 | key.objectid = 0; |
0b86a832 | 5684 | key.offset = 0; |
9078a3e1 | 5685 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
5686 | path = btrfs_alloc_path(); |
5687 | if (!path) | |
5688 | return -ENOMEM; | |
5689 | ||
d397712b | 5690 | while (1) { |
0b86a832 CM |
5691 | ret = find_first_block_group(root, path, &key); |
5692 | if (ret > 0) { | |
5693 | ret = 0; | |
5694 | goto error; | |
9078a3e1 | 5695 | } |
0b86a832 CM |
5696 | if (ret != 0) |
5697 | goto error; | |
5698 | ||
5f39d397 CM |
5699 | leaf = path->nodes[0]; |
5700 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 5701 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 5702 | if (!cache) { |
0b86a832 | 5703 | ret = -ENOMEM; |
9078a3e1 CM |
5704 | break; |
5705 | } | |
3e1ad54f | 5706 | |
d2fb3437 | 5707 | atomic_set(&cache->count, 1); |
c286ac48 | 5708 | spin_lock_init(&cache->lock); |
25179201 | 5709 | mutex_init(&cache->alloc_mutex); |
ea6a478e | 5710 | mutex_init(&cache->cache_mutex); |
0f9dd46c | 5711 | INIT_LIST_HEAD(&cache->list); |
5f39d397 CM |
5712 | read_extent_buffer(leaf, &cache->item, |
5713 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
5714 | sizeof(cache->item)); | |
9078a3e1 | 5715 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 5716 | |
9078a3e1 CM |
5717 | key.objectid = found_key.objectid + found_key.offset; |
5718 | btrfs_release_path(root, path); | |
0b86a832 | 5719 | cache->flags = btrfs_block_group_flags(&cache->item); |
96b5179d | 5720 | |
6324fbf3 CM |
5721 | ret = update_space_info(info, cache->flags, found_key.offset, |
5722 | btrfs_block_group_used(&cache->item), | |
5723 | &space_info); | |
5724 | BUG_ON(ret); | |
5725 | cache->space_info = space_info; | |
80eb234a JB |
5726 | down_write(&space_info->groups_sem); |
5727 | list_add_tail(&cache->list, &space_info->block_groups); | |
5728 | up_write(&space_info->groups_sem); | |
0f9dd46c JB |
5729 | |
5730 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
5731 | BUG_ON(ret); | |
75ccf47d CM |
5732 | |
5733 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c YZ |
5734 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
5735 | set_block_group_readonly(cache); | |
9078a3e1 | 5736 | } |
0b86a832 CM |
5737 | ret = 0; |
5738 | error: | |
9078a3e1 | 5739 | btrfs_free_path(path); |
0b86a832 | 5740 | return ret; |
9078a3e1 | 5741 | } |
6324fbf3 CM |
5742 | |
5743 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
5744 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 5745 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
5746 | u64 size) |
5747 | { | |
5748 | int ret; | |
6324fbf3 CM |
5749 | struct btrfs_root *extent_root; |
5750 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
5751 | |
5752 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 5753 | |
e02119d5 CM |
5754 | root->fs_info->last_trans_new_blockgroup = trans->transid; |
5755 | ||
8f18cf13 | 5756 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
5757 | if (!cache) |
5758 | return -ENOMEM; | |
5759 | ||
e17cade2 | 5760 | cache->key.objectid = chunk_offset; |
6324fbf3 | 5761 | cache->key.offset = size; |
d2fb3437 YZ |
5762 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
5763 | atomic_set(&cache->count, 1); | |
c286ac48 | 5764 | spin_lock_init(&cache->lock); |
25179201 | 5765 | mutex_init(&cache->alloc_mutex); |
ea6a478e | 5766 | mutex_init(&cache->cache_mutex); |
0f9dd46c | 5767 | INIT_LIST_HEAD(&cache->list); |
0ef3e66b | 5768 | |
6324fbf3 | 5769 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
5770 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
5771 | cache->flags = type; | |
5772 | btrfs_set_block_group_flags(&cache->item, type); | |
5773 | ||
5774 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
5775 | &cache->space_info); | |
5776 | BUG_ON(ret); | |
80eb234a JB |
5777 | down_write(&cache->space_info->groups_sem); |
5778 | list_add_tail(&cache->list, &cache->space_info->block_groups); | |
5779 | up_write(&cache->space_info->groups_sem); | |
6324fbf3 | 5780 | |
0f9dd46c JB |
5781 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
5782 | BUG_ON(ret); | |
c286ac48 | 5783 | |
6324fbf3 CM |
5784 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
5785 | sizeof(cache->item)); | |
5786 | BUG_ON(ret); | |
5787 | ||
d18a2c44 | 5788 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 5789 | |
6324fbf3 CM |
5790 | return 0; |
5791 | } | |
1a40e23b ZY |
5792 | |
5793 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
5794 | struct btrfs_root *root, u64 group_start) | |
5795 | { | |
5796 | struct btrfs_path *path; | |
5797 | struct btrfs_block_group_cache *block_group; | |
5798 | struct btrfs_key key; | |
5799 | int ret; | |
5800 | ||
1a40e23b ZY |
5801 | root = root->fs_info->extent_root; |
5802 | ||
5803 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
5804 | BUG_ON(!block_group); | |
c146afad | 5805 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
5806 | |
5807 | memcpy(&key, &block_group->key, sizeof(key)); | |
5808 | ||
5809 | path = btrfs_alloc_path(); | |
5810 | BUG_ON(!path); | |
5811 | ||
3dfdb934 | 5812 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
5813 | rb_erase(&block_group->cache_node, |
5814 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 YZ |
5815 | spin_unlock(&root->fs_info->block_group_cache_lock); |
5816 | btrfs_remove_free_space_cache(block_group); | |
80eb234a | 5817 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5818 | list_del(&block_group->list); |
80eb234a | 5819 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 5820 | |
c146afad YZ |
5821 | spin_lock(&block_group->space_info->lock); |
5822 | block_group->space_info->total_bytes -= block_group->key.offset; | |
5823 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
5824 | spin_unlock(&block_group->space_info->lock); | |
2b82032c | 5825 | block_group->space_info->full = 0; |
c146afad | 5826 | |
d2fb3437 YZ |
5827 | put_block_group(block_group); |
5828 | put_block_group(block_group); | |
1a40e23b ZY |
5829 | |
5830 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
5831 | if (ret > 0) | |
5832 | ret = -EIO; | |
5833 | if (ret < 0) | |
5834 | goto out; | |
5835 | ||
5836 | ret = btrfs_del_item(trans, root, path); | |
5837 | out: | |
5838 | btrfs_free_path(path); | |
5839 | return ret; | |
5840 | } |