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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 update_block_group(struct btrfs_trans_handle *trans, |
60 | struct btrfs_root *root, | |
61 | u64 bytenr, u64 num_bytes, int alloc, | |
62 | int mark_free); | |
56bec294 CM |
63 | static noinline int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
64 | struct btrfs_root *root, | |
65 | u64 bytenr, u64 num_bytes, u64 parent, | |
66 | u64 root_objectid, u64 ref_generation, | |
67 | u64 owner_objectid, int pin, | |
68 | int ref_to_drop); | |
d548ee51 | 69 | |
6a63209f JB |
70 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
71 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
72 | u64 flags, int force); | |
73 | ||
0f9dd46c JB |
74 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
75 | { | |
76 | return (cache->flags & bits) == bits; | |
77 | } | |
78 | ||
79 | /* | |
80 | * this adds the block group to the fs_info rb tree for the block group | |
81 | * cache | |
82 | */ | |
b2950863 | 83 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
84 | struct btrfs_block_group_cache *block_group) |
85 | { | |
86 | struct rb_node **p; | |
87 | struct rb_node *parent = NULL; | |
88 | struct btrfs_block_group_cache *cache; | |
89 | ||
90 | spin_lock(&info->block_group_cache_lock); | |
91 | p = &info->block_group_cache_tree.rb_node; | |
92 | ||
93 | while (*p) { | |
94 | parent = *p; | |
95 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
96 | cache_node); | |
97 | if (block_group->key.objectid < cache->key.objectid) { | |
98 | p = &(*p)->rb_left; | |
99 | } else if (block_group->key.objectid > cache->key.objectid) { | |
100 | p = &(*p)->rb_right; | |
101 | } else { | |
102 | spin_unlock(&info->block_group_cache_lock); | |
103 | return -EEXIST; | |
104 | } | |
105 | } | |
106 | ||
107 | rb_link_node(&block_group->cache_node, parent, p); | |
108 | rb_insert_color(&block_group->cache_node, | |
109 | &info->block_group_cache_tree); | |
110 | spin_unlock(&info->block_group_cache_lock); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | /* | |
116 | * This will return the block group at or after bytenr if contains is 0, else | |
117 | * it will return the block group that contains the bytenr | |
118 | */ | |
119 | static struct btrfs_block_group_cache * | |
120 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
121 | int contains) | |
122 | { | |
123 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
124 | struct rb_node *n; | |
125 | u64 end, start; | |
126 | ||
127 | spin_lock(&info->block_group_cache_lock); | |
128 | n = info->block_group_cache_tree.rb_node; | |
129 | ||
130 | while (n) { | |
131 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
132 | cache_node); | |
133 | end = cache->key.objectid + cache->key.offset - 1; | |
134 | start = cache->key.objectid; | |
135 | ||
136 | if (bytenr < start) { | |
137 | if (!contains && (!ret || start < ret->key.objectid)) | |
138 | ret = cache; | |
139 | n = n->rb_left; | |
140 | } else if (bytenr > start) { | |
141 | if (contains && bytenr <= end) { | |
142 | ret = cache; | |
143 | break; | |
144 | } | |
145 | n = n->rb_right; | |
146 | } else { | |
147 | ret = cache; | |
148 | break; | |
149 | } | |
150 | } | |
d2fb3437 YZ |
151 | if (ret) |
152 | atomic_inc(&ret->count); | |
0f9dd46c JB |
153 | spin_unlock(&info->block_group_cache_lock); |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | /* | |
159 | * this is only called by cache_block_group, since we could have freed extents | |
160 | * we need to check the pinned_extents for any extents that can't be used yet | |
161 | * since their free space will be released as soon as the transaction commits. | |
162 | */ | |
163 | static int add_new_free_space(struct btrfs_block_group_cache *block_group, | |
164 | struct btrfs_fs_info *info, u64 start, u64 end) | |
165 | { | |
166 | u64 extent_start, extent_end, size; | |
167 | int ret; | |
168 | ||
25179201 | 169 | mutex_lock(&info->pinned_mutex); |
0f9dd46c JB |
170 | while (start < end) { |
171 | ret = find_first_extent_bit(&info->pinned_extents, start, | |
172 | &extent_start, &extent_end, | |
173 | EXTENT_DIRTY); | |
174 | if (ret) | |
175 | break; | |
176 | ||
177 | if (extent_start == start) { | |
178 | start = extent_end + 1; | |
179 | } else if (extent_start > start && extent_start < end) { | |
180 | size = extent_start - start; | |
ea6a478e JB |
181 | ret = btrfs_add_free_space(block_group, start, |
182 | size); | |
0f9dd46c JB |
183 | BUG_ON(ret); |
184 | start = extent_end + 1; | |
185 | } else { | |
186 | break; | |
187 | } | |
188 | } | |
189 | ||
190 | if (start < end) { | |
191 | size = end - start; | |
ea6a478e | 192 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
193 | BUG_ON(ret); |
194 | } | |
25179201 | 195 | mutex_unlock(&info->pinned_mutex); |
0f9dd46c JB |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
a512bbf8 YZ |
200 | static int remove_sb_from_cache(struct btrfs_root *root, |
201 | struct btrfs_block_group_cache *cache) | |
202 | { | |
203 | u64 bytenr; | |
204 | u64 *logical; | |
205 | int stripe_len; | |
206 | int i, nr, ret; | |
207 | ||
208 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
209 | bytenr = btrfs_sb_offset(i); | |
210 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
211 | cache->key.objectid, bytenr, 0, | |
212 | &logical, &nr, &stripe_len); | |
213 | BUG_ON(ret); | |
214 | while (nr--) { | |
215 | btrfs_remove_free_space(cache, logical[nr], | |
216 | stripe_len); | |
217 | } | |
218 | kfree(logical); | |
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
e37c9e69 CM |
223 | static int cache_block_group(struct btrfs_root *root, |
224 | struct btrfs_block_group_cache *block_group) | |
225 | { | |
226 | struct btrfs_path *path; | |
ef8bbdfe | 227 | int ret = 0; |
e37c9e69 | 228 | struct btrfs_key key; |
5f39d397 | 229 | struct extent_buffer *leaf; |
e37c9e69 | 230 | int slot; |
e4404d6e | 231 | u64 last; |
e37c9e69 | 232 | |
00f5c795 CM |
233 | if (!block_group) |
234 | return 0; | |
235 | ||
e37c9e69 | 236 | root = root->fs_info->extent_root; |
e37c9e69 CM |
237 | |
238 | if (block_group->cached) | |
239 | return 0; | |
f510cfec | 240 | |
e37c9e69 CM |
241 | path = btrfs_alloc_path(); |
242 | if (!path) | |
243 | return -ENOMEM; | |
7d7d6068 | 244 | |
2cc58cf2 | 245 | path->reada = 2; |
5cd57b2c CM |
246 | /* |
247 | * we get into deadlocks with paths held by callers of this function. | |
248 | * since the alloc_mutex is protecting things right now, just | |
249 | * skip the locking here | |
250 | */ | |
251 | path->skip_locking = 1; | |
e4404d6e YZ |
252 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
253 | key.objectid = last; | |
e37c9e69 CM |
254 | key.offset = 0; |
255 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
256 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
257 | if (ret < 0) | |
ef8bbdfe | 258 | goto err; |
a512bbf8 | 259 | |
d397712b | 260 | while (1) { |
5f39d397 | 261 | leaf = path->nodes[0]; |
e37c9e69 | 262 | slot = path->slots[0]; |
5f39d397 | 263 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 264 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
265 | if (ret < 0) |
266 | goto err; | |
0f9dd46c | 267 | if (ret == 0) |
e37c9e69 | 268 | continue; |
0f9dd46c | 269 | else |
e37c9e69 | 270 | break; |
e37c9e69 | 271 | } |
5f39d397 | 272 | btrfs_item_key_to_cpu(leaf, &key, slot); |
0f9dd46c | 273 | if (key.objectid < block_group->key.objectid) |
7d7d6068 | 274 | goto next; |
0f9dd46c | 275 | |
e37c9e69 | 276 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 277 | block_group->key.offset) |
e37c9e69 | 278 | break; |
7d7d6068 | 279 | |
e37c9e69 | 280 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
0f9dd46c JB |
281 | add_new_free_space(block_group, root->fs_info, last, |
282 | key.objectid); | |
283 | ||
7d7d6068 | 284 | last = key.objectid + key.offset; |
e37c9e69 | 285 | } |
7d7d6068 | 286 | next: |
e37c9e69 CM |
287 | path->slots[0]++; |
288 | } | |
289 | ||
0f9dd46c JB |
290 | add_new_free_space(block_group, root->fs_info, last, |
291 | block_group->key.objectid + | |
292 | block_group->key.offset); | |
293 | ||
e37c9e69 | 294 | block_group->cached = 1; |
70cb0743 | 295 | remove_sb_from_cache(root, block_group); |
ef8bbdfe | 296 | ret = 0; |
54aa1f4d | 297 | err: |
e37c9e69 | 298 | btrfs_free_path(path); |
ef8bbdfe | 299 | return ret; |
e37c9e69 CM |
300 | } |
301 | ||
0f9dd46c JB |
302 | /* |
303 | * return the block group that starts at or after bytenr | |
304 | */ | |
d397712b CM |
305 | static struct btrfs_block_group_cache * |
306 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 307 | { |
0f9dd46c | 308 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 309 | |
0f9dd46c | 310 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 311 | |
0f9dd46c | 312 | return cache; |
0ef3e66b CM |
313 | } |
314 | ||
0f9dd46c JB |
315 | /* |
316 | * return the block group that contains teh given bytenr | |
317 | */ | |
d397712b CM |
318 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
319 | struct btrfs_fs_info *info, | |
320 | u64 bytenr) | |
be744175 | 321 | { |
0f9dd46c | 322 | struct btrfs_block_group_cache *cache; |
be744175 | 323 | |
0f9dd46c | 324 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 325 | |
0f9dd46c | 326 | return cache; |
be744175 | 327 | } |
0b86a832 | 328 | |
d2fb3437 YZ |
329 | static inline void put_block_group(struct btrfs_block_group_cache *cache) |
330 | { | |
331 | if (atomic_dec_and_test(&cache->count)) | |
332 | kfree(cache); | |
333 | } | |
334 | ||
0f9dd46c JB |
335 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
336 | u64 flags) | |
6324fbf3 | 337 | { |
0f9dd46c | 338 | struct list_head *head = &info->space_info; |
0f9dd46c | 339 | struct btrfs_space_info *found; |
4184ea7f CM |
340 | |
341 | rcu_read_lock(); | |
342 | list_for_each_entry_rcu(found, head, list) { | |
343 | if (found->flags == flags) { | |
344 | rcu_read_unlock(); | |
0f9dd46c | 345 | return found; |
4184ea7f | 346 | } |
0f9dd46c | 347 | } |
4184ea7f | 348 | rcu_read_unlock(); |
0f9dd46c | 349 | return NULL; |
6324fbf3 CM |
350 | } |
351 | ||
4184ea7f CM |
352 | /* |
353 | * after adding space to the filesystem, we need to clear the full flags | |
354 | * on all the space infos. | |
355 | */ | |
356 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
357 | { | |
358 | struct list_head *head = &info->space_info; | |
359 | struct btrfs_space_info *found; | |
360 | ||
361 | rcu_read_lock(); | |
362 | list_for_each_entry_rcu(found, head, list) | |
363 | found->full = 0; | |
364 | rcu_read_unlock(); | |
365 | } | |
366 | ||
80eb234a JB |
367 | static u64 div_factor(u64 num, int factor) |
368 | { | |
369 | if (factor == 10) | |
370 | return num; | |
371 | num *= factor; | |
372 | do_div(num, 10); | |
373 | return num; | |
374 | } | |
375 | ||
d2fb3437 YZ |
376 | u64 btrfs_find_block_group(struct btrfs_root *root, |
377 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 378 | { |
96b5179d | 379 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 380 | u64 used; |
d2fb3437 YZ |
381 | u64 last = max(search_hint, search_start); |
382 | u64 group_start = 0; | |
31f3c99b | 383 | int full_search = 0; |
d2fb3437 | 384 | int factor = 9; |
0ef3e66b | 385 | int wrapped = 0; |
31f3c99b | 386 | again: |
e8569813 ZY |
387 | while (1) { |
388 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
389 | if (!cache) |
390 | break; | |
96b5179d | 391 | |
c286ac48 | 392 | spin_lock(&cache->lock); |
96b5179d CM |
393 | last = cache->key.objectid + cache->key.offset; |
394 | used = btrfs_block_group_used(&cache->item); | |
395 | ||
d2fb3437 YZ |
396 | if ((full_search || !cache->ro) && |
397 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 398 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
399 | div_factor(cache->key.offset, factor)) { |
400 | group_start = cache->key.objectid; | |
c286ac48 | 401 | spin_unlock(&cache->lock); |
d2fb3437 | 402 | put_block_group(cache); |
8790d502 CM |
403 | goto found; |
404 | } | |
6324fbf3 | 405 | } |
c286ac48 | 406 | spin_unlock(&cache->lock); |
d2fb3437 | 407 | put_block_group(cache); |
de428b63 | 408 | cond_resched(); |
cd1bc465 | 409 | } |
0ef3e66b CM |
410 | if (!wrapped) { |
411 | last = search_start; | |
412 | wrapped = 1; | |
413 | goto again; | |
414 | } | |
415 | if (!full_search && factor < 10) { | |
be744175 | 416 | last = search_start; |
31f3c99b | 417 | full_search = 1; |
0ef3e66b | 418 | factor = 10; |
31f3c99b CM |
419 | goto again; |
420 | } | |
be744175 | 421 | found: |
d2fb3437 | 422 | return group_start; |
925baedd | 423 | } |
0f9dd46c | 424 | |
e02119d5 | 425 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 426 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
427 | { |
428 | int ret; | |
429 | struct btrfs_key key; | |
31840ae1 | 430 | struct btrfs_path *path; |
e02119d5 | 431 | |
31840ae1 ZY |
432 | path = btrfs_alloc_path(); |
433 | BUG_ON(!path); | |
e02119d5 CM |
434 | key.objectid = start; |
435 | key.offset = len; | |
436 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
437 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
438 | 0, 0); | |
31840ae1 | 439 | btrfs_free_path(path); |
7bb86316 CM |
440 | return ret; |
441 | } | |
442 | ||
d8d5f3e1 CM |
443 | /* |
444 | * Back reference rules. Back refs have three main goals: | |
445 | * | |
446 | * 1) differentiate between all holders of references to an extent so that | |
447 | * when a reference is dropped we can make sure it was a valid reference | |
448 | * before freeing the extent. | |
449 | * | |
450 | * 2) Provide enough information to quickly find the holders of an extent | |
451 | * if we notice a given block is corrupted or bad. | |
452 | * | |
453 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
454 | * maintenance. This is actually the same as #2, but with a slightly | |
455 | * different use case. | |
456 | * | |
457 | * File extents can be referenced by: | |
458 | * | |
459 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 460 | * - different files inside a single subvolume |
d8d5f3e1 CM |
461 | * - different offsets inside a file (bookend extents in file.c) |
462 | * | |
463 | * The extent ref structure has fields for: | |
464 | * | |
465 | * - Objectid of the subvolume root | |
466 | * - Generation number of the tree holding the reference | |
467 | * - objectid of the file holding the reference | |
31840ae1 ZY |
468 | * - number of references holding by parent node (alway 1 for tree blocks) |
469 | * | |
470 | * Btree leaf may hold multiple references to a file extent. In most cases, | |
471 | * these references are from same file and the corresponding offsets inside | |
3bb1a1bc | 472 | * the file are close together. |
d8d5f3e1 CM |
473 | * |
474 | * When a file extent is allocated the fields are filled in: | |
3bb1a1bc | 475 | * (root_key.objectid, trans->transid, inode objectid, 1) |
d8d5f3e1 CM |
476 | * |
477 | * When a leaf is cow'd new references are added for every file extent found | |
31840ae1 ZY |
478 | * in the leaf. It looks similar to the create case, but trans->transid will |
479 | * be different when the block is cow'd. | |
d8d5f3e1 | 480 | * |
3bb1a1bc | 481 | * (root_key.objectid, trans->transid, inode objectid, |
31840ae1 | 482 | * number of references in the leaf) |
d8d5f3e1 | 483 | * |
3bb1a1bc YZ |
484 | * When a file extent is removed either during snapshot deletion or |
485 | * file truncation, we find the corresponding back reference and check | |
486 | * the following fields: | |
d8d5f3e1 | 487 | * |
3bb1a1bc YZ |
488 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
489 | * inode objectid) | |
d8d5f3e1 CM |
490 | * |
491 | * Btree extents can be referenced by: | |
492 | * | |
493 | * - Different subvolumes | |
494 | * - Different generations of the same subvolume | |
495 | * | |
d8d5f3e1 CM |
496 | * When a tree block is created, back references are inserted: |
497 | * | |
3bb1a1bc | 498 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 499 | * |
31840ae1 ZY |
500 | * When a tree block is cow'd, new back references are added for all the |
501 | * blocks it points to. If the tree block isn't in reference counted root, | |
502 | * the old back references are removed. These new back references are of | |
503 | * the form (trans->transid will have increased since creation): | |
d8d5f3e1 | 504 | * |
3bb1a1bc | 505 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 506 | * |
31840ae1 | 507 | * When a backref is in deleting, the following fields are checked: |
d8d5f3e1 CM |
508 | * |
509 | * if backref was for a tree root: | |
3bb1a1bc | 510 | * (btrfs_header_owner(itself), btrfs_header_generation(itself), level) |
d8d5f3e1 | 511 | * else |
3bb1a1bc | 512 | * (btrfs_header_owner(parent), btrfs_header_generation(parent), level) |
d8d5f3e1 | 513 | * |
31840ae1 | 514 | * Back Reference Key composing: |
d8d5f3e1 | 515 | * |
31840ae1 ZY |
516 | * The key objectid corresponds to the first byte in the extent, the key |
517 | * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first | |
518 | * byte of parent extent. If a extent is tree root, the key offset is set | |
519 | * to the key objectid. | |
d8d5f3e1 | 520 | */ |
31840ae1 | 521 | |
d397712b | 522 | static noinline int lookup_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 | 523 | struct btrfs_root *root, |
3bb1a1bc YZ |
524 | struct btrfs_path *path, |
525 | u64 bytenr, u64 parent, | |
526 | u64 ref_root, u64 ref_generation, | |
527 | u64 owner_objectid, int del) | |
7bb86316 | 528 | { |
7bb86316 | 529 | struct btrfs_key key; |
31840ae1 ZY |
530 | struct btrfs_extent_ref *ref; |
531 | struct extent_buffer *leaf; | |
3bb1a1bc | 532 | u64 ref_objectid; |
74493f7a CM |
533 | int ret; |
534 | ||
31840ae1 ZY |
535 | key.objectid = bytenr; |
536 | key.type = BTRFS_EXTENT_REF_KEY; | |
537 | key.offset = parent; | |
538 | ||
539 | ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); | |
540 | if (ret < 0) | |
541 | goto out; | |
542 | if (ret > 0) { | |
543 | ret = -ENOENT; | |
544 | goto out; | |
545 | } | |
546 | ||
547 | leaf = path->nodes[0]; | |
548 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
3bb1a1bc | 549 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
31840ae1 | 550 | if (btrfs_ref_root(leaf, ref) != ref_root || |
3bb1a1bc YZ |
551 | btrfs_ref_generation(leaf, ref) != ref_generation || |
552 | (ref_objectid != owner_objectid && | |
553 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { | |
31840ae1 ZY |
554 | ret = -EIO; |
555 | WARN_ON(1); | |
556 | goto out; | |
557 | } | |
558 | ret = 0; | |
559 | out: | |
560 | return ret; | |
561 | } | |
562 | ||
d397712b | 563 | static noinline int insert_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
564 | struct btrfs_root *root, |
565 | struct btrfs_path *path, | |
566 | u64 bytenr, u64 parent, | |
567 | u64 ref_root, u64 ref_generation, | |
56bec294 CM |
568 | u64 owner_objectid, |
569 | int refs_to_add) | |
31840ae1 ZY |
570 | { |
571 | struct btrfs_key key; | |
572 | struct extent_buffer *leaf; | |
573 | struct btrfs_extent_ref *ref; | |
574 | u32 num_refs; | |
575 | int ret; | |
74493f7a | 576 | |
74493f7a CM |
577 | key.objectid = bytenr; |
578 | key.type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 579 | key.offset = parent; |
74493f7a | 580 | |
31840ae1 ZY |
581 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); |
582 | if (ret == 0) { | |
583 | leaf = path->nodes[0]; | |
584 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
585 | struct btrfs_extent_ref); | |
586 | btrfs_set_ref_root(leaf, ref, ref_root); | |
587 | btrfs_set_ref_generation(leaf, ref, ref_generation); | |
588 | btrfs_set_ref_objectid(leaf, ref, owner_objectid); | |
56bec294 | 589 | btrfs_set_ref_num_refs(leaf, ref, refs_to_add); |
31840ae1 ZY |
590 | } else if (ret == -EEXIST) { |
591 | u64 existing_owner; | |
56bec294 | 592 | |
31840ae1 ZY |
593 | BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); |
594 | leaf = path->nodes[0]; | |
595 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
596 | struct btrfs_extent_ref); | |
597 | if (btrfs_ref_root(leaf, ref) != ref_root || | |
598 | btrfs_ref_generation(leaf, ref) != ref_generation) { | |
599 | ret = -EIO; | |
600 | WARN_ON(1); | |
7bb86316 | 601 | goto out; |
31840ae1 ZY |
602 | } |
603 | ||
604 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
605 | BUG_ON(num_refs == 0); | |
56bec294 | 606 | btrfs_set_ref_num_refs(leaf, ref, num_refs + refs_to_add); |
31840ae1 ZY |
607 | |
608 | existing_owner = btrfs_ref_objectid(leaf, ref); | |
3bb1a1bc YZ |
609 | if (existing_owner != owner_objectid && |
610 | existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { | |
31840ae1 ZY |
611 | btrfs_set_ref_objectid(leaf, ref, |
612 | BTRFS_MULTIPLE_OBJECTIDS); | |
31840ae1 ZY |
613 | } |
614 | ret = 0; | |
615 | } else { | |
7bb86316 | 616 | goto out; |
31840ae1 | 617 | } |
b9473439 | 618 | btrfs_unlock_up_safe(path, 1); |
7bb86316 CM |
619 | btrfs_mark_buffer_dirty(path->nodes[0]); |
620 | out: | |
621 | btrfs_release_path(root, path); | |
622 | return ret; | |
74493f7a CM |
623 | } |
624 | ||
d397712b | 625 | static noinline int remove_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 | 626 | struct btrfs_root *root, |
56bec294 CM |
627 | struct btrfs_path *path, |
628 | int refs_to_drop) | |
31840ae1 ZY |
629 | { |
630 | struct extent_buffer *leaf; | |
631 | struct btrfs_extent_ref *ref; | |
632 | u32 num_refs; | |
633 | int ret = 0; | |
634 | ||
635 | leaf = path->nodes[0]; | |
636 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
637 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
56bec294 CM |
638 | BUG_ON(num_refs < refs_to_drop); |
639 | num_refs -= refs_to_drop; | |
31840ae1 ZY |
640 | if (num_refs == 0) { |
641 | ret = btrfs_del_item(trans, root, path); | |
642 | } else { | |
643 | btrfs_set_ref_num_refs(leaf, ref, num_refs); | |
644 | btrfs_mark_buffer_dirty(leaf); | |
645 | } | |
646 | btrfs_release_path(root, path); | |
647 | return ret; | |
648 | } | |
649 | ||
4b4e25f2 | 650 | #ifdef BIO_RW_DISCARD |
15916de8 CM |
651 | static void btrfs_issue_discard(struct block_device *bdev, |
652 | u64 start, u64 len) | |
653 | { | |
15916de8 | 654 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); |
15916de8 | 655 | } |
4b4e25f2 | 656 | #endif |
15916de8 | 657 | |
1f3c79a2 LH |
658 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
659 | u64 num_bytes) | |
660 | { | |
661 | #ifdef BIO_RW_DISCARD | |
662 | int ret; | |
663 | u64 map_length = num_bytes; | |
664 | struct btrfs_multi_bio *multi = NULL; | |
665 | ||
666 | /* Tell the block device(s) that the sectors can be discarded */ | |
667 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
668 | bytenr, &map_length, &multi, 0); | |
669 | if (!ret) { | |
670 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
671 | int i; | |
672 | ||
673 | if (map_length > num_bytes) | |
674 | map_length = num_bytes; | |
675 | ||
676 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
677 | btrfs_issue_discard(stripe->dev->bdev, | |
678 | stripe->physical, | |
679 | map_length); | |
680 | } | |
681 | kfree(multi); | |
682 | } | |
683 | ||
684 | return ret; | |
685 | #else | |
686 | return 0; | |
687 | #endif | |
688 | } | |
689 | ||
31840ae1 ZY |
690 | static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
691 | struct btrfs_root *root, u64 bytenr, | |
56bec294 | 692 | u64 num_bytes, |
31840ae1 ZY |
693 | u64 orig_parent, u64 parent, |
694 | u64 orig_root, u64 ref_root, | |
695 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 696 | u64 owner_objectid) |
31840ae1 ZY |
697 | { |
698 | int ret; | |
56bec294 | 699 | int pin = owner_objectid < BTRFS_FIRST_FREE_OBJECTID; |
31840ae1 | 700 | |
56bec294 CM |
701 | ret = btrfs_update_delayed_ref(trans, bytenr, num_bytes, |
702 | orig_parent, parent, orig_root, | |
703 | ref_root, orig_generation, | |
704 | ref_generation, owner_objectid, pin); | |
31840ae1 | 705 | BUG_ON(ret); |
31840ae1 ZY |
706 | return ret; |
707 | } | |
708 | ||
709 | int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, | |
710 | struct btrfs_root *root, u64 bytenr, | |
56bec294 | 711 | u64 num_bytes, u64 orig_parent, u64 parent, |
31840ae1 | 712 | u64 ref_root, u64 ref_generation, |
3bb1a1bc | 713 | u64 owner_objectid) |
31840ae1 ZY |
714 | { |
715 | int ret; | |
716 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && | |
717 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
718 | return 0; | |
56bec294 CM |
719 | |
720 | ret = __btrfs_update_extent_ref(trans, root, bytenr, num_bytes, | |
721 | orig_parent, parent, ref_root, | |
722 | ref_root, ref_generation, | |
723 | ref_generation, owner_objectid); | |
31840ae1 ZY |
724 | return ret; |
725 | } | |
925baedd | 726 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 | 727 | struct btrfs_root *root, u64 bytenr, |
56bec294 | 728 | u64 num_bytes, |
31840ae1 ZY |
729 | u64 orig_parent, u64 parent, |
730 | u64 orig_root, u64 ref_root, | |
731 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 732 | u64 owner_objectid) |
56bec294 CM |
733 | { |
734 | int ret; | |
735 | ||
736 | ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, ref_root, | |
737 | ref_generation, owner_objectid, | |
738 | BTRFS_ADD_DELAYED_REF, 0); | |
739 | BUG_ON(ret); | |
740 | return ret; | |
741 | } | |
742 | ||
743 | static noinline_for_stack int add_extent_ref(struct btrfs_trans_handle *trans, | |
744 | struct btrfs_root *root, u64 bytenr, | |
745 | u64 num_bytes, u64 parent, u64 ref_root, | |
746 | u64 ref_generation, u64 owner_objectid, | |
747 | int refs_to_add) | |
02217ed2 | 748 | { |
5caf2a00 | 749 | struct btrfs_path *path; |
02217ed2 | 750 | int ret; |
e2fa7227 | 751 | struct btrfs_key key; |
5f39d397 | 752 | struct extent_buffer *l; |
234b63a0 | 753 | struct btrfs_extent_item *item; |
cf27e1ee | 754 | u32 refs; |
037e6390 | 755 | |
5caf2a00 | 756 | path = btrfs_alloc_path(); |
54aa1f4d CM |
757 | if (!path) |
758 | return -ENOMEM; | |
26b8003f | 759 | |
3c12ac72 | 760 | path->reada = 1; |
b9473439 | 761 | path->leave_spinning = 1; |
db94535d | 762 | key.objectid = bytenr; |
31840ae1 | 763 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 764 | key.offset = num_bytes; |
31840ae1 | 765 | |
56bec294 CM |
766 | /* first find the extent item and update its reference count */ |
767 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
768 | path, 0, 1); | |
b9473439 CM |
769 | if (ret < 0) { |
770 | btrfs_set_path_blocking(path); | |
54aa1f4d | 771 | return ret; |
b9473439 | 772 | } |
31840ae1 | 773 | |
56bec294 CM |
774 | if (ret > 0) { |
775 | WARN_ON(1); | |
776 | btrfs_free_path(path); | |
777 | return -EIO; | |
778 | } | |
5f39d397 | 779 | l = path->nodes[0]; |
31840ae1 ZY |
780 | |
781 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
771ed689 CM |
782 | if (key.objectid != bytenr) { |
783 | btrfs_print_leaf(root->fs_info->extent_root, path->nodes[0]); | |
d397712b CM |
784 | printk(KERN_ERR "btrfs wanted %llu found %llu\n", |
785 | (unsigned long long)bytenr, | |
786 | (unsigned long long)key.objectid); | |
771ed689 CM |
787 | BUG(); |
788 | } | |
31840ae1 ZY |
789 | BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); |
790 | ||
56bec294 CM |
791 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
792 | ||
793 | refs = btrfs_extent_refs(l, item); | |
794 | btrfs_set_extent_refs(l, item, refs + refs_to_add); | |
b9473439 CM |
795 | btrfs_unlock_up_safe(path, 1); |
796 | ||
56bec294 CM |
797 | btrfs_mark_buffer_dirty(path->nodes[0]); |
798 | ||
799 | btrfs_release_path(root->fs_info->extent_root, path); | |
800 | ||
801 | path->reada = 1; | |
b9473439 CM |
802 | path->leave_spinning = 1; |
803 | ||
56bec294 CM |
804 | /* now insert the actual backref */ |
805 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
806 | path, bytenr, parent, | |
807 | ref_root, ref_generation, | |
808 | owner_objectid, refs_to_add); | |
809 | BUG_ON(ret); | |
810 | btrfs_free_path(path); | |
811 | return 0; | |
812 | } | |
813 | ||
814 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
815 | struct btrfs_root *root, | |
816 | u64 bytenr, u64 num_bytes, u64 parent, | |
817 | u64 ref_root, u64 ref_generation, | |
818 | u64 owner_objectid) | |
819 | { | |
820 | int ret; | |
821 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && | |
822 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
823 | return 0; | |
824 | ||
825 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, parent, | |
826 | 0, ref_root, 0, ref_generation, | |
827 | owner_objectid); | |
828 | return ret; | |
829 | } | |
830 | ||
831 | static int drop_delayed_ref(struct btrfs_trans_handle *trans, | |
832 | struct btrfs_root *root, | |
833 | struct btrfs_delayed_ref_node *node) | |
834 | { | |
835 | int ret = 0; | |
836 | struct btrfs_delayed_ref *ref = btrfs_delayed_node_to_ref(node); | |
837 | ||
838 | BUG_ON(node->ref_mod == 0); | |
839 | ret = __btrfs_free_extent(trans, root, node->bytenr, node->num_bytes, | |
840 | node->parent, ref->root, ref->generation, | |
841 | ref->owner_objectid, ref->pin, node->ref_mod); | |
842 | ||
843 | return ret; | |
844 | } | |
845 | ||
846 | /* helper function to actually process a single delayed ref entry */ | |
847 | static noinline int run_one_delayed_ref(struct btrfs_trans_handle *trans, | |
848 | struct btrfs_root *root, | |
849 | struct btrfs_delayed_ref_node *node, | |
850 | int insert_reserved) | |
851 | { | |
852 | int ret; | |
853 | struct btrfs_delayed_ref *ref; | |
854 | ||
855 | if (node->parent == (u64)-1) { | |
856 | struct btrfs_delayed_ref_head *head; | |
857 | /* | |
858 | * we've hit the end of the chain and we were supposed | |
859 | * to insert this extent into the tree. But, it got | |
860 | * deleted before we ever needed to insert it, so all | |
861 | * we have to do is clean up the accounting | |
862 | */ | |
863 | if (insert_reserved) { | |
864 | update_reserved_extents(root, node->bytenr, | |
865 | node->num_bytes, 0); | |
866 | } | |
867 | head = btrfs_delayed_node_to_head(node); | |
868 | mutex_unlock(&head->mutex); | |
869 | return 0; | |
870 | } | |
871 | ||
872 | ref = btrfs_delayed_node_to_ref(node); | |
873 | if (ref->action == BTRFS_ADD_DELAYED_REF) { | |
874 | if (insert_reserved) { | |
875 | struct btrfs_key ins; | |
876 | ||
877 | ins.objectid = node->bytenr; | |
878 | ins.offset = node->num_bytes; | |
879 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
880 | ||
881 | /* record the full extent allocation */ | |
882 | ret = __btrfs_alloc_reserved_extent(trans, root, | |
883 | node->parent, ref->root, | |
884 | ref->generation, ref->owner_objectid, | |
885 | &ins, node->ref_mod); | |
886 | update_reserved_extents(root, node->bytenr, | |
887 | node->num_bytes, 0); | |
888 | } else { | |
889 | /* just add one backref */ | |
890 | ret = add_extent_ref(trans, root, node->bytenr, | |
891 | node->num_bytes, | |
892 | node->parent, ref->root, ref->generation, | |
893 | ref->owner_objectid, node->ref_mod); | |
894 | } | |
895 | BUG_ON(ret); | |
896 | } else if (ref->action == BTRFS_DROP_DELAYED_REF) { | |
897 | WARN_ON(insert_reserved); | |
898 | ret = drop_delayed_ref(trans, root, node); | |
899 | } | |
900 | return 0; | |
901 | } | |
902 | ||
903 | static noinline struct btrfs_delayed_ref_node * | |
904 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
905 | { | |
906 | struct rb_node *node; | |
907 | struct btrfs_delayed_ref_node *ref; | |
908 | int action = BTRFS_ADD_DELAYED_REF; | |
909 | again: | |
910 | /* | |
911 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
912 | * this prevents ref count from going down to zero when | |
913 | * there still are pending delayed ref. | |
914 | */ | |
915 | node = rb_prev(&head->node.rb_node); | |
916 | while (1) { | |
917 | if (!node) | |
918 | break; | |
919 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
920 | rb_node); | |
921 | if (ref->bytenr != head->node.bytenr) | |
922 | break; | |
923 | if (btrfs_delayed_node_to_ref(ref)->action == action) | |
924 | return ref; | |
925 | node = rb_prev(node); | |
926 | } | |
927 | if (action == BTRFS_ADD_DELAYED_REF) { | |
928 | action = BTRFS_DROP_DELAYED_REF; | |
929 | goto again; | |
930 | } | |
931 | return NULL; | |
932 | } | |
933 | ||
c3e69d58 CM |
934 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
935 | struct btrfs_root *root, | |
936 | struct list_head *cluster) | |
56bec294 | 937 | { |
56bec294 CM |
938 | struct btrfs_delayed_ref_root *delayed_refs; |
939 | struct btrfs_delayed_ref_node *ref; | |
940 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
941 | int ret; | |
c3e69d58 | 942 | int count = 0; |
56bec294 | 943 | int must_insert_reserved = 0; |
56bec294 CM |
944 | |
945 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
946 | while (1) { |
947 | if (!locked_ref) { | |
c3e69d58 CM |
948 | /* pick a new head ref from the cluster list */ |
949 | if (list_empty(cluster)) | |
56bec294 | 950 | break; |
56bec294 | 951 | |
c3e69d58 CM |
952 | locked_ref = list_entry(cluster->next, |
953 | struct btrfs_delayed_ref_head, cluster); | |
954 | ||
955 | /* grab the lock that says we are going to process | |
956 | * all the refs for this head */ | |
957 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
958 | ||
959 | /* | |
960 | * we may have dropped the spin lock to get the head | |
961 | * mutex lock, and that might have given someone else | |
962 | * time to free the head. If that's true, it has been | |
963 | * removed from our list and we can move on. | |
964 | */ | |
965 | if (ret == -EAGAIN) { | |
966 | locked_ref = NULL; | |
967 | count++; | |
968 | continue; | |
56bec294 CM |
969 | } |
970 | } | |
a28ec197 | 971 | |
56bec294 CM |
972 | /* |
973 | * record the must insert reserved flag before we | |
974 | * drop the spin lock. | |
975 | */ | |
976 | must_insert_reserved = locked_ref->must_insert_reserved; | |
977 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 978 | |
56bec294 CM |
979 | /* |
980 | * locked_ref is the head node, so we have to go one | |
981 | * node back for any delayed ref updates | |
982 | */ | |
56bec294 CM |
983 | ref = select_delayed_ref(locked_ref); |
984 | if (!ref) { | |
985 | /* All delayed refs have been processed, Go ahead | |
986 | * and send the head node to run_one_delayed_ref, | |
987 | * so that any accounting fixes can happen | |
988 | */ | |
989 | ref = &locked_ref->node; | |
c3e69d58 | 990 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
991 | locked_ref = NULL; |
992 | } | |
02217ed2 | 993 | |
56bec294 CM |
994 | ref->in_tree = 0; |
995 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
996 | delayed_refs->num_entries--; | |
997 | spin_unlock(&delayed_refs->lock); | |
925baedd | 998 | |
56bec294 CM |
999 | ret = run_one_delayed_ref(trans, root, ref, |
1000 | must_insert_reserved); | |
1001 | BUG_ON(ret); | |
1002 | btrfs_put_delayed_ref(ref); | |
eb099670 | 1003 | |
c3e69d58 CM |
1004 | count++; |
1005 | cond_resched(); | |
1006 | spin_lock(&delayed_refs->lock); | |
1007 | } | |
1008 | return count; | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * this starts processing the delayed reference count updates and | |
1013 | * extent insertions we have queued up so far. count can be | |
1014 | * 0, which means to process everything in the tree at the start | |
1015 | * of the run (but not newly added entries), or it can be some target | |
1016 | * number you'd like to process. | |
1017 | */ | |
1018 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
1019 | struct btrfs_root *root, unsigned long count) | |
1020 | { | |
1021 | struct rb_node *node; | |
1022 | struct btrfs_delayed_ref_root *delayed_refs; | |
1023 | struct btrfs_delayed_ref_node *ref; | |
1024 | struct list_head cluster; | |
1025 | int ret; | |
1026 | int run_all = count == (unsigned long)-1; | |
1027 | int run_most = 0; | |
1028 | ||
1029 | if (root == root->fs_info->extent_root) | |
1030 | root = root->fs_info->tree_root; | |
1031 | ||
1032 | delayed_refs = &trans->transaction->delayed_refs; | |
1033 | INIT_LIST_HEAD(&cluster); | |
1034 | again: | |
1035 | spin_lock(&delayed_refs->lock); | |
1036 | if (count == 0) { | |
1037 | count = delayed_refs->num_entries * 2; | |
1038 | run_most = 1; | |
1039 | } | |
1040 | while (1) { | |
1041 | if (!(run_all || run_most) && | |
1042 | delayed_refs->num_heads_ready < 64) | |
1043 | break; | |
eb099670 | 1044 | |
56bec294 | 1045 | /* |
c3e69d58 CM |
1046 | * go find something we can process in the rbtree. We start at |
1047 | * the beginning of the tree, and then build a cluster | |
1048 | * of refs to process starting at the first one we are able to | |
1049 | * lock | |
56bec294 | 1050 | */ |
c3e69d58 CM |
1051 | ret = btrfs_find_ref_cluster(trans, &cluster, |
1052 | delayed_refs->run_delayed_start); | |
1053 | if (ret) | |
56bec294 CM |
1054 | break; |
1055 | ||
c3e69d58 CM |
1056 | ret = run_clustered_refs(trans, root, &cluster); |
1057 | BUG_ON(ret < 0); | |
1058 | ||
1059 | count -= min_t(unsigned long, ret, count); | |
1060 | ||
1061 | if (count == 0) | |
1062 | break; | |
eb099670 | 1063 | } |
c3e69d58 | 1064 | |
56bec294 | 1065 | if (run_all) { |
56bec294 | 1066 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 1067 | if (!node) |
56bec294 | 1068 | goto out; |
c3e69d58 | 1069 | count = (unsigned long)-1; |
e9d0b13b | 1070 | |
56bec294 CM |
1071 | while (node) { |
1072 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
1073 | rb_node); | |
1074 | if (btrfs_delayed_ref_is_head(ref)) { | |
1075 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 1076 | |
56bec294 CM |
1077 | head = btrfs_delayed_node_to_head(ref); |
1078 | atomic_inc(&ref->refs); | |
1079 | ||
1080 | spin_unlock(&delayed_refs->lock); | |
1081 | mutex_lock(&head->mutex); | |
1082 | mutex_unlock(&head->mutex); | |
1083 | ||
1084 | btrfs_put_delayed_ref(ref); | |
1887be66 | 1085 | cond_resched(); |
56bec294 CM |
1086 | goto again; |
1087 | } | |
1088 | node = rb_next(node); | |
1089 | } | |
1090 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
1091 | schedule_timeout(1); |
1092 | goto again; | |
5f39d397 | 1093 | } |
54aa1f4d | 1094 | out: |
c3e69d58 | 1095 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
1096 | return 0; |
1097 | } | |
1098 | ||
80ff3856 | 1099 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
17d217fe | 1100 | struct btrfs_root *root, u64 objectid, u64 bytenr) |
be20aa9d CM |
1101 | { |
1102 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
1103 | struct btrfs_path *path; | |
f321e491 YZ |
1104 | struct extent_buffer *leaf; |
1105 | struct btrfs_extent_ref *ref_item; | |
1106 | struct btrfs_key key; | |
1107 | struct btrfs_key found_key; | |
80ff3856 YZ |
1108 | u64 ref_root; |
1109 | u64 last_snapshot; | |
be20aa9d CM |
1110 | u32 nritems; |
1111 | int ret; | |
925baedd | 1112 | |
be20aa9d | 1113 | key.objectid = bytenr; |
31840ae1 | 1114 | key.offset = (u64)-1; |
f321e491 | 1115 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 1116 | |
f321e491 | 1117 | path = btrfs_alloc_path(); |
be20aa9d CM |
1118 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
1119 | if (ret < 0) | |
1120 | goto out; | |
1121 | BUG_ON(ret == 0); | |
80ff3856 YZ |
1122 | |
1123 | ret = -ENOENT; | |
1124 | if (path->slots[0] == 0) | |
31840ae1 | 1125 | goto out; |
be20aa9d | 1126 | |
31840ae1 | 1127 | path->slots[0]--; |
f321e491 YZ |
1128 | leaf = path->nodes[0]; |
1129 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
be20aa9d CM |
1130 | |
1131 | if (found_key.objectid != bytenr || | |
80ff3856 | 1132 | found_key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 1133 | goto out; |
f321e491 | 1134 | |
80ff3856 | 1135 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
be20aa9d | 1136 | while (1) { |
f321e491 YZ |
1137 | leaf = path->nodes[0]; |
1138 | nritems = btrfs_header_nritems(leaf); | |
be20aa9d CM |
1139 | if (path->slots[0] >= nritems) { |
1140 | ret = btrfs_next_leaf(extent_root, path); | |
f321e491 YZ |
1141 | if (ret < 0) |
1142 | goto out; | |
be20aa9d CM |
1143 | if (ret == 0) |
1144 | continue; | |
1145 | break; | |
1146 | } | |
f321e491 | 1147 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
be20aa9d CM |
1148 | if (found_key.objectid != bytenr) |
1149 | break; | |
bd09835d | 1150 | |
be20aa9d CM |
1151 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
1152 | path->slots[0]++; | |
1153 | continue; | |
1154 | } | |
1155 | ||
f321e491 | 1156 | ref_item = btrfs_item_ptr(leaf, path->slots[0], |
be20aa9d | 1157 | struct btrfs_extent_ref); |
80ff3856 | 1158 | ref_root = btrfs_ref_root(leaf, ref_item); |
17d217fe YZ |
1159 | if ((ref_root != root->root_key.objectid && |
1160 | ref_root != BTRFS_TREE_LOG_OBJECTID) || | |
1161 | objectid != btrfs_ref_objectid(leaf, ref_item)) { | |
80ff3856 | 1162 | ret = 1; |
f321e491 | 1163 | goto out; |
80ff3856 YZ |
1164 | } |
1165 | if (btrfs_ref_generation(leaf, ref_item) <= last_snapshot) { | |
f321e491 YZ |
1166 | ret = 1; |
1167 | goto out; | |
1168 | } | |
80ff3856 YZ |
1169 | |
1170 | path->slots[0]++; | |
f321e491 YZ |
1171 | } |
1172 | ret = 0; | |
be20aa9d | 1173 | out: |
80ff3856 | 1174 | btrfs_free_path(path); |
f321e491 | 1175 | return ret; |
be20aa9d | 1176 | } |
c5739bba | 1177 | |
31840ae1 ZY |
1178 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
1179 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 1180 | { |
5f39d397 | 1181 | struct btrfs_key key; |
6407bf6d | 1182 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
1183 | u64 root_gen; |
1184 | u32 nritems; | |
02217ed2 | 1185 | int i; |
db94535d | 1186 | int level; |
31840ae1 | 1187 | int ret = 0; |
e4657689 | 1188 | int shared = 0; |
a28ec197 | 1189 | |
3768f368 | 1190 | if (!root->ref_cows) |
a28ec197 | 1191 | return 0; |
5f39d397 | 1192 | |
e4657689 ZY |
1193 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
1194 | shared = 0; | |
1195 | root_gen = root->root_key.offset; | |
1196 | } else { | |
1197 | shared = 1; | |
1198 | root_gen = trans->transid - 1; | |
1199 | } | |
1200 | ||
db94535d | 1201 | level = btrfs_header_level(buf); |
5f39d397 | 1202 | nritems = btrfs_header_nritems(buf); |
4a096752 | 1203 | |
31840ae1 | 1204 | if (level == 0) { |
31153d81 YZ |
1205 | struct btrfs_leaf_ref *ref; |
1206 | struct btrfs_extent_info *info; | |
1207 | ||
31840ae1 | 1208 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 1209 | if (!ref) { |
31840ae1 | 1210 | ret = -ENOMEM; |
31153d81 YZ |
1211 | goto out; |
1212 | } | |
1213 | ||
e4657689 | 1214 | ref->root_gen = root_gen; |
31153d81 YZ |
1215 | ref->bytenr = buf->start; |
1216 | ref->owner = btrfs_header_owner(buf); | |
1217 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 1218 | ref->nritems = nr_extents; |
31153d81 | 1219 | info = ref->extents; |
bcc63abb | 1220 | |
31840ae1 | 1221 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
1222 | u64 disk_bytenr; |
1223 | btrfs_item_key_to_cpu(buf, &key, i); | |
1224 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1225 | continue; | |
1226 | fi = btrfs_item_ptr(buf, i, | |
1227 | struct btrfs_file_extent_item); | |
1228 | if (btrfs_file_extent_type(buf, fi) == | |
1229 | BTRFS_FILE_EXTENT_INLINE) | |
1230 | continue; | |
1231 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1232 | if (disk_bytenr == 0) | |
1233 | continue; | |
1234 | ||
1235 | info->bytenr = disk_bytenr; | |
1236 | info->num_bytes = | |
1237 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
1238 | info->objectid = key.objectid; | |
1239 | info->offset = key.offset; | |
1240 | info++; | |
1241 | } | |
1242 | ||
e4657689 | 1243 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
1244 | if (ret == -EEXIST && shared) { |
1245 | struct btrfs_leaf_ref *old; | |
1246 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
1247 | BUG_ON(!old); | |
1248 | btrfs_remove_leaf_ref(root, old); | |
1249 | btrfs_free_leaf_ref(root, old); | |
1250 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
1251 | } | |
31153d81 | 1252 | WARN_ON(ret); |
bcc63abb | 1253 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
1254 | } |
1255 | out: | |
31840ae1 ZY |
1256 | return ret; |
1257 | } | |
1258 | ||
b7a9f29f CM |
1259 | /* when a block goes through cow, we update the reference counts of |
1260 | * everything that block points to. The internal pointers of the block | |
1261 | * can be in just about any order, and it is likely to have clusters of | |
1262 | * things that are close together and clusters of things that are not. | |
1263 | * | |
1264 | * To help reduce the seeks that come with updating all of these reference | |
1265 | * counts, sort them by byte number before actual updates are done. | |
1266 | * | |
1267 | * struct refsort is used to match byte number to slot in the btree block. | |
1268 | * we sort based on the byte number and then use the slot to actually | |
1269 | * find the item. | |
bd56b302 CM |
1270 | * |
1271 | * struct refsort is smaller than strcut btrfs_item and smaller than | |
1272 | * struct btrfs_key_ptr. Since we're currently limited to the page size | |
1273 | * for a btree block, there's no way for a kmalloc of refsorts for a | |
1274 | * single node to be bigger than a page. | |
b7a9f29f CM |
1275 | */ |
1276 | struct refsort { | |
1277 | u64 bytenr; | |
1278 | u32 slot; | |
1279 | }; | |
1280 | ||
1281 | /* | |
1282 | * for passing into sort() | |
1283 | */ | |
1284 | static int refsort_cmp(const void *a_void, const void *b_void) | |
1285 | { | |
1286 | const struct refsort *a = a_void; | |
1287 | const struct refsort *b = b_void; | |
1288 | ||
1289 | if (a->bytenr < b->bytenr) | |
1290 | return -1; | |
1291 | if (a->bytenr > b->bytenr) | |
1292 | return 1; | |
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | ||
1297 | noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans, | |
1298 | struct btrfs_root *root, | |
1299 | struct extent_buffer *orig_buf, | |
1300 | struct extent_buffer *buf, u32 *nr_extents) | |
31840ae1 ZY |
1301 | { |
1302 | u64 bytenr; | |
1303 | u64 ref_root; | |
1304 | u64 orig_root; | |
1305 | u64 ref_generation; | |
1306 | u64 orig_generation; | |
b7a9f29f | 1307 | struct refsort *sorted; |
31840ae1 ZY |
1308 | u32 nritems; |
1309 | u32 nr_file_extents = 0; | |
1310 | struct btrfs_key key; | |
1311 | struct btrfs_file_extent_item *fi; | |
1312 | int i; | |
1313 | int level; | |
1314 | int ret = 0; | |
1315 | int faili = 0; | |
b7a9f29f CM |
1316 | int refi = 0; |
1317 | int slot; | |
31840ae1 | 1318 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
56bec294 | 1319 | u64, u64, u64, u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
1320 | |
1321 | ref_root = btrfs_header_owner(buf); | |
1322 | ref_generation = btrfs_header_generation(buf); | |
1323 | orig_root = btrfs_header_owner(orig_buf); | |
1324 | orig_generation = btrfs_header_generation(orig_buf); | |
1325 | ||
1326 | nritems = btrfs_header_nritems(buf); | |
1327 | level = btrfs_header_level(buf); | |
1328 | ||
b7a9f29f CM |
1329 | sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS); |
1330 | BUG_ON(!sorted); | |
1331 | ||
31840ae1 ZY |
1332 | if (root->ref_cows) { |
1333 | process_func = __btrfs_inc_extent_ref; | |
1334 | } else { | |
1335 | if (level == 0 && | |
1336 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1337 | goto out; | |
1338 | if (level != 0 && | |
1339 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1340 | goto out; | |
1341 | process_func = __btrfs_update_extent_ref; | |
1342 | } | |
1343 | ||
b7a9f29f CM |
1344 | /* |
1345 | * we make two passes through the items. In the first pass we | |
1346 | * only record the byte number and slot. Then we sort based on | |
1347 | * byte number and do the actual work based on the sorted results | |
1348 | */ | |
31840ae1 ZY |
1349 | for (i = 0; i < nritems; i++) { |
1350 | cond_resched(); | |
db94535d | 1351 | if (level == 0) { |
5f39d397 CM |
1352 | btrfs_item_key_to_cpu(buf, &key, i); |
1353 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 1354 | continue; |
5f39d397 | 1355 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 1356 | struct btrfs_file_extent_item); |
5f39d397 | 1357 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
1358 | BTRFS_FILE_EXTENT_INLINE) |
1359 | continue; | |
31840ae1 ZY |
1360 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
1361 | if (bytenr == 0) | |
54aa1f4d | 1362 | continue; |
31840ae1 ZY |
1363 | |
1364 | nr_file_extents++; | |
b7a9f29f CM |
1365 | sorted[refi].bytenr = bytenr; |
1366 | sorted[refi].slot = i; | |
1367 | refi++; | |
1368 | } else { | |
1369 | bytenr = btrfs_node_blockptr(buf, i); | |
1370 | sorted[refi].bytenr = bytenr; | |
1371 | sorted[refi].slot = i; | |
1372 | refi++; | |
1373 | } | |
1374 | } | |
1375 | /* | |
1376 | * if refi == 0, we didn't actually put anything into the sorted | |
1377 | * array and we're done | |
1378 | */ | |
1379 | if (refi == 0) | |
1380 | goto out; | |
1381 | ||
1382 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); | |
1383 | ||
1384 | for (i = 0; i < refi; i++) { | |
1385 | cond_resched(); | |
1386 | slot = sorted[i].slot; | |
1387 | bytenr = sorted[i].bytenr; | |
1388 | ||
1389 | if (level == 0) { | |
1390 | btrfs_item_key_to_cpu(buf, &key, slot); | |
56bec294 CM |
1391 | fi = btrfs_item_ptr(buf, slot, |
1392 | struct btrfs_file_extent_item); | |
1393 | ||
1394 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1395 | if (bytenr == 0) | |
1396 | continue; | |
31840ae1 | 1397 | |
31840ae1 | 1398 | ret = process_func(trans, root, bytenr, |
56bec294 CM |
1399 | btrfs_file_extent_disk_num_bytes(buf, fi), |
1400 | orig_buf->start, buf->start, | |
1401 | orig_root, ref_root, | |
1402 | orig_generation, ref_generation, | |
1403 | key.objectid); | |
31840ae1 ZY |
1404 | |
1405 | if (ret) { | |
b7a9f29f | 1406 | faili = slot; |
31840ae1 ZY |
1407 | WARN_ON(1); |
1408 | goto fail; | |
1409 | } | |
54aa1f4d | 1410 | } else { |
56bec294 | 1411 | ret = process_func(trans, root, bytenr, buf->len, |
31840ae1 ZY |
1412 | orig_buf->start, buf->start, |
1413 | orig_root, ref_root, | |
1414 | orig_generation, ref_generation, | |
3bb1a1bc | 1415 | level - 1); |
31840ae1 | 1416 | if (ret) { |
b7a9f29f | 1417 | faili = slot; |
31840ae1 ZY |
1418 | WARN_ON(1); |
1419 | goto fail; | |
1420 | } | |
54aa1f4d CM |
1421 | } |
1422 | } | |
31840ae1 | 1423 | out: |
b7a9f29f | 1424 | kfree(sorted); |
31840ae1 ZY |
1425 | if (nr_extents) { |
1426 | if (level == 0) | |
1427 | *nr_extents = nr_file_extents; | |
1428 | else | |
1429 | *nr_extents = nritems; | |
1430 | } | |
1431 | return 0; | |
1432 | fail: | |
b7a9f29f | 1433 | kfree(sorted); |
31840ae1 | 1434 | WARN_ON(1); |
54aa1f4d | 1435 | return ret; |
02217ed2 CM |
1436 | } |
1437 | ||
31840ae1 ZY |
1438 | int btrfs_update_ref(struct btrfs_trans_handle *trans, |
1439 | struct btrfs_root *root, struct extent_buffer *orig_buf, | |
1440 | struct extent_buffer *buf, int start_slot, int nr) | |
1441 | ||
1442 | { | |
1443 | u64 bytenr; | |
1444 | u64 ref_root; | |
1445 | u64 orig_root; | |
1446 | u64 ref_generation; | |
1447 | u64 orig_generation; | |
1448 | struct btrfs_key key; | |
1449 | struct btrfs_file_extent_item *fi; | |
1450 | int i; | |
1451 | int ret; | |
1452 | int slot; | |
1453 | int level; | |
1454 | ||
1455 | BUG_ON(start_slot < 0); | |
1456 | BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); | |
1457 | ||
1458 | ref_root = btrfs_header_owner(buf); | |
1459 | ref_generation = btrfs_header_generation(buf); | |
1460 | orig_root = btrfs_header_owner(orig_buf); | |
1461 | orig_generation = btrfs_header_generation(orig_buf); | |
1462 | level = btrfs_header_level(buf); | |
1463 | ||
1464 | if (!root->ref_cows) { | |
1465 | if (level == 0 && | |
1466 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1467 | return 0; | |
1468 | if (level != 0 && | |
1469 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | for (i = 0, slot = start_slot; i < nr; i++, slot++) { | |
1474 | cond_resched(); | |
1475 | if (level == 0) { | |
1476 | btrfs_item_key_to_cpu(buf, &key, slot); | |
1477 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1478 | continue; | |
1479 | fi = btrfs_item_ptr(buf, slot, | |
1480 | struct btrfs_file_extent_item); | |
1481 | if (btrfs_file_extent_type(buf, fi) == | |
1482 | BTRFS_FILE_EXTENT_INLINE) | |
1483 | continue; | |
1484 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1485 | if (bytenr == 0) | |
1486 | continue; | |
31840ae1 | 1487 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
56bec294 CM |
1488 | btrfs_file_extent_disk_num_bytes(buf, fi), |
1489 | orig_buf->start, buf->start, | |
1490 | orig_root, ref_root, orig_generation, | |
1491 | ref_generation, key.objectid); | |
31840ae1 ZY |
1492 | if (ret) |
1493 | goto fail; | |
1494 | } else { | |
1495 | bytenr = btrfs_node_blockptr(buf, slot); | |
31840ae1 | 1496 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
56bec294 CM |
1497 | buf->len, orig_buf->start, |
1498 | buf->start, orig_root, ref_root, | |
31840ae1 | 1499 | orig_generation, ref_generation, |
3bb1a1bc | 1500 | level - 1); |
31840ae1 ZY |
1501 | if (ret) |
1502 | goto fail; | |
1503 | } | |
1504 | } | |
1505 | return 0; | |
1506 | fail: | |
1507 | WARN_ON(1); | |
1508 | return -1; | |
1509 | } | |
1510 | ||
9078a3e1 CM |
1511 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
1512 | struct btrfs_root *root, | |
1513 | struct btrfs_path *path, | |
1514 | struct btrfs_block_group_cache *cache) | |
1515 | { | |
1516 | int ret; | |
9078a3e1 | 1517 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
1518 | unsigned long bi; |
1519 | struct extent_buffer *leaf; | |
9078a3e1 | 1520 | |
9078a3e1 | 1521 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
1522 | if (ret < 0) |
1523 | goto fail; | |
9078a3e1 | 1524 | BUG_ON(ret); |
5f39d397 CM |
1525 | |
1526 | leaf = path->nodes[0]; | |
1527 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1528 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
1529 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 1530 | btrfs_release_path(extent_root, path); |
54aa1f4d | 1531 | fail: |
9078a3e1 CM |
1532 | if (ret) |
1533 | return ret; | |
9078a3e1 CM |
1534 | return 0; |
1535 | ||
1536 | } | |
1537 | ||
96b5179d CM |
1538 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
1539 | struct btrfs_root *root) | |
9078a3e1 | 1540 | { |
0f9dd46c JB |
1541 | struct btrfs_block_group_cache *cache, *entry; |
1542 | struct rb_node *n; | |
9078a3e1 CM |
1543 | int err = 0; |
1544 | int werr = 0; | |
9078a3e1 | 1545 | struct btrfs_path *path; |
96b5179d | 1546 | u64 last = 0; |
9078a3e1 CM |
1547 | |
1548 | path = btrfs_alloc_path(); | |
1549 | if (!path) | |
1550 | return -ENOMEM; | |
1551 | ||
d397712b | 1552 | while (1) { |
0f9dd46c JB |
1553 | cache = NULL; |
1554 | spin_lock(&root->fs_info->block_group_cache_lock); | |
1555 | for (n = rb_first(&root->fs_info->block_group_cache_tree); | |
1556 | n; n = rb_next(n)) { | |
1557 | entry = rb_entry(n, struct btrfs_block_group_cache, | |
1558 | cache_node); | |
1559 | if (entry->dirty) { | |
1560 | cache = entry; | |
1561 | break; | |
1562 | } | |
1563 | } | |
1564 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
54aa1f4d | 1565 | |
0f9dd46c | 1566 | if (!cache) |
96b5179d | 1567 | break; |
0f9dd46c | 1568 | |
e8569813 | 1569 | cache->dirty = 0; |
0f9dd46c JB |
1570 | last += cache->key.offset; |
1571 | ||
96b5179d CM |
1572 | err = write_one_cache_group(trans, root, |
1573 | path, cache); | |
1574 | /* | |
1575 | * if we fail to write the cache group, we want | |
1576 | * to keep it marked dirty in hopes that a later | |
1577 | * write will work | |
1578 | */ | |
1579 | if (err) { | |
1580 | werr = err; | |
1581 | continue; | |
9078a3e1 CM |
1582 | } |
1583 | } | |
1584 | btrfs_free_path(path); | |
1585 | return werr; | |
1586 | } | |
1587 | ||
d2fb3437 YZ |
1588 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
1589 | { | |
1590 | struct btrfs_block_group_cache *block_group; | |
1591 | int readonly = 0; | |
1592 | ||
1593 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
1594 | if (!block_group || block_group->ro) | |
1595 | readonly = 1; | |
1596 | if (block_group) | |
1597 | put_block_group(block_group); | |
1598 | return readonly; | |
1599 | } | |
1600 | ||
593060d7 CM |
1601 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1602 | u64 total_bytes, u64 bytes_used, | |
1603 | struct btrfs_space_info **space_info) | |
1604 | { | |
1605 | struct btrfs_space_info *found; | |
1606 | ||
1607 | found = __find_space_info(info, flags); | |
1608 | if (found) { | |
25179201 | 1609 | spin_lock(&found->lock); |
593060d7 CM |
1610 | found->total_bytes += total_bytes; |
1611 | found->bytes_used += bytes_used; | |
8f18cf13 | 1612 | found->full = 0; |
25179201 | 1613 | spin_unlock(&found->lock); |
593060d7 CM |
1614 | *space_info = found; |
1615 | return 0; | |
1616 | } | |
c146afad | 1617 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
1618 | if (!found) |
1619 | return -ENOMEM; | |
1620 | ||
0f9dd46c | 1621 | INIT_LIST_HEAD(&found->block_groups); |
80eb234a | 1622 | init_rwsem(&found->groups_sem); |
0f9dd46c | 1623 | spin_lock_init(&found->lock); |
593060d7 CM |
1624 | found->flags = flags; |
1625 | found->total_bytes = total_bytes; | |
1626 | found->bytes_used = bytes_used; | |
1627 | found->bytes_pinned = 0; | |
e8569813 | 1628 | found->bytes_reserved = 0; |
c146afad | 1629 | found->bytes_readonly = 0; |
6a63209f | 1630 | found->bytes_delalloc = 0; |
593060d7 | 1631 | found->full = 0; |
0ef3e66b | 1632 | found->force_alloc = 0; |
593060d7 | 1633 | *space_info = found; |
4184ea7f | 1634 | list_add_rcu(&found->list, &info->space_info); |
593060d7 CM |
1635 | return 0; |
1636 | } | |
1637 | ||
8790d502 CM |
1638 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1639 | { | |
1640 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1641 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1642 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1643 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1644 | if (extra_flags) { |
1645 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1646 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1647 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1648 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1649 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1650 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1651 | } | |
1652 | } | |
593060d7 | 1653 | |
c146afad YZ |
1654 | static void set_block_group_readonly(struct btrfs_block_group_cache *cache) |
1655 | { | |
1656 | spin_lock(&cache->space_info->lock); | |
1657 | spin_lock(&cache->lock); | |
1658 | if (!cache->ro) { | |
1659 | cache->space_info->bytes_readonly += cache->key.offset - | |
1660 | btrfs_block_group_used(&cache->item); | |
1661 | cache->ro = 1; | |
1662 | } | |
1663 | spin_unlock(&cache->lock); | |
1664 | spin_unlock(&cache->space_info->lock); | |
1665 | } | |
1666 | ||
2b82032c | 1667 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1668 | { |
2b82032c | 1669 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
a061fc8d CM |
1670 | |
1671 | if (num_devices == 1) | |
1672 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1673 | if (num_devices < 4) | |
1674 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1675 | ||
ec44a35c CM |
1676 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1677 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1678 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1679 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1680 | } |
ec44a35c CM |
1681 | |
1682 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1683 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1684 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1685 | } |
ec44a35c CM |
1686 | |
1687 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1688 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1689 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1690 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1691 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1692 | return flags; | |
1693 | } | |
1694 | ||
6a63209f JB |
1695 | static u64 btrfs_get_alloc_profile(struct btrfs_root *root, u64 data) |
1696 | { | |
1697 | struct btrfs_fs_info *info = root->fs_info; | |
1698 | u64 alloc_profile; | |
1699 | ||
1700 | if (data) { | |
1701 | alloc_profile = info->avail_data_alloc_bits & | |
1702 | info->data_alloc_profile; | |
1703 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
1704 | } else if (root == root->fs_info->chunk_root) { | |
1705 | alloc_profile = info->avail_system_alloc_bits & | |
1706 | info->system_alloc_profile; | |
1707 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
1708 | } else { | |
1709 | alloc_profile = info->avail_metadata_alloc_bits & | |
1710 | info->metadata_alloc_profile; | |
1711 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
1712 | } | |
1713 | ||
1714 | return btrfs_reduce_alloc_profile(root, data); | |
1715 | } | |
1716 | ||
1717 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) | |
1718 | { | |
1719 | u64 alloc_target; | |
1720 | ||
1721 | alloc_target = btrfs_get_alloc_profile(root, 1); | |
1722 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, | |
1723 | alloc_target); | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * for now this just makes sure we have at least 5% of our metadata space free | |
1728 | * for use. | |
1729 | */ | |
1730 | int btrfs_check_metadata_free_space(struct btrfs_root *root) | |
1731 | { | |
1732 | struct btrfs_fs_info *info = root->fs_info; | |
1733 | struct btrfs_space_info *meta_sinfo; | |
1734 | u64 alloc_target, thresh; | |
4e06bdd6 | 1735 | int committed = 0, ret; |
6a63209f JB |
1736 | |
1737 | /* get the space info for where the metadata will live */ | |
1738 | alloc_target = btrfs_get_alloc_profile(root, 0); | |
1739 | meta_sinfo = __find_space_info(info, alloc_target); | |
1740 | ||
4e06bdd6 | 1741 | again: |
6a63209f | 1742 | spin_lock(&meta_sinfo->lock); |
4e06bdd6 JB |
1743 | if (!meta_sinfo->full) |
1744 | thresh = meta_sinfo->total_bytes * 80; | |
1745 | else | |
1746 | thresh = meta_sinfo->total_bytes * 95; | |
6a63209f JB |
1747 | |
1748 | do_div(thresh, 100); | |
1749 | ||
1750 | if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + | |
1751 | meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) { | |
4e06bdd6 JB |
1752 | struct btrfs_trans_handle *trans; |
1753 | if (!meta_sinfo->full) { | |
1754 | meta_sinfo->force_alloc = 1; | |
1755 | spin_unlock(&meta_sinfo->lock); | |
1756 | ||
1757 | trans = btrfs_start_transaction(root, 1); | |
1758 | if (!trans) | |
1759 | return -ENOMEM; | |
1760 | ||
1761 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
1762 | 2 * 1024 * 1024, alloc_target, 0); | |
1763 | btrfs_end_transaction(trans, root); | |
1764 | goto again; | |
1765 | } | |
6a63209f | 1766 | spin_unlock(&meta_sinfo->lock); |
4e06bdd6 JB |
1767 | |
1768 | if (!committed) { | |
1769 | committed = 1; | |
1770 | trans = btrfs_join_transaction(root, 1); | |
1771 | if (!trans) | |
1772 | return -ENOMEM; | |
1773 | ret = btrfs_commit_transaction(trans, root); | |
1774 | if (ret) | |
1775 | return ret; | |
1776 | goto again; | |
1777 | } | |
6a63209f JB |
1778 | return -ENOSPC; |
1779 | } | |
1780 | spin_unlock(&meta_sinfo->lock); | |
1781 | ||
1782 | return 0; | |
1783 | } | |
1784 | ||
1785 | /* | |
1786 | * This will check the space that the inode allocates from to make sure we have | |
1787 | * enough space for bytes. | |
1788 | */ | |
1789 | int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, | |
1790 | u64 bytes) | |
1791 | { | |
1792 | struct btrfs_space_info *data_sinfo; | |
4e06bdd6 | 1793 | int ret = 0, committed = 0; |
6a63209f JB |
1794 | |
1795 | /* make sure bytes are sectorsize aligned */ | |
1796 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
1797 | ||
1798 | data_sinfo = BTRFS_I(inode)->space_info; | |
1799 | again: | |
1800 | /* make sure we have enough space to handle the data first */ | |
1801 | spin_lock(&data_sinfo->lock); | |
1802 | if (data_sinfo->total_bytes - data_sinfo->bytes_used - | |
1803 | data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved - | |
1804 | data_sinfo->bytes_pinned - data_sinfo->bytes_readonly - | |
1805 | data_sinfo->bytes_may_use < bytes) { | |
4e06bdd6 JB |
1806 | struct btrfs_trans_handle *trans; |
1807 | ||
6a63209f JB |
1808 | /* |
1809 | * if we don't have enough free bytes in this space then we need | |
1810 | * to alloc a new chunk. | |
1811 | */ | |
1812 | if (!data_sinfo->full) { | |
1813 | u64 alloc_target; | |
6a63209f JB |
1814 | |
1815 | data_sinfo->force_alloc = 1; | |
1816 | spin_unlock(&data_sinfo->lock); | |
1817 | ||
1818 | alloc_target = btrfs_get_alloc_profile(root, 1); | |
1819 | trans = btrfs_start_transaction(root, 1); | |
1820 | if (!trans) | |
1821 | return -ENOMEM; | |
1822 | ||
1823 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
1824 | bytes + 2 * 1024 * 1024, | |
1825 | alloc_target, 0); | |
1826 | btrfs_end_transaction(trans, root); | |
1827 | if (ret) | |
1828 | return ret; | |
1829 | goto again; | |
1830 | } | |
1831 | spin_unlock(&data_sinfo->lock); | |
4e06bdd6 JB |
1832 | |
1833 | /* commit the current transaction and try again */ | |
1834 | if (!committed) { | |
1835 | committed = 1; | |
1836 | trans = btrfs_join_transaction(root, 1); | |
1837 | if (!trans) | |
1838 | return -ENOMEM; | |
1839 | ret = btrfs_commit_transaction(trans, root); | |
1840 | if (ret) | |
1841 | return ret; | |
1842 | goto again; | |
1843 | } | |
1844 | ||
6a63209f JB |
1845 | printk(KERN_ERR "no space left, need %llu, %llu delalloc bytes" |
1846 | ", %llu bytes_used, %llu bytes_reserved, " | |
1847 | "%llu bytes_pinned, %llu bytes_readonly, %llu may use" | |
1848 | "%llu total\n", bytes, data_sinfo->bytes_delalloc, | |
1849 | data_sinfo->bytes_used, data_sinfo->bytes_reserved, | |
1850 | data_sinfo->bytes_pinned, data_sinfo->bytes_readonly, | |
1851 | data_sinfo->bytes_may_use, data_sinfo->total_bytes); | |
1852 | return -ENOSPC; | |
1853 | } | |
1854 | data_sinfo->bytes_may_use += bytes; | |
1855 | BTRFS_I(inode)->reserved_bytes += bytes; | |
1856 | spin_unlock(&data_sinfo->lock); | |
1857 | ||
1858 | return btrfs_check_metadata_free_space(root); | |
1859 | } | |
1860 | ||
1861 | /* | |
1862 | * if there was an error for whatever reason after calling | |
1863 | * btrfs_check_data_free_space, call this so we can cleanup the counters. | |
1864 | */ | |
1865 | void btrfs_free_reserved_data_space(struct btrfs_root *root, | |
1866 | struct inode *inode, u64 bytes) | |
1867 | { | |
1868 | struct btrfs_space_info *data_sinfo; | |
1869 | ||
1870 | /* make sure bytes are sectorsize aligned */ | |
1871 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
1872 | ||
1873 | data_sinfo = BTRFS_I(inode)->space_info; | |
1874 | spin_lock(&data_sinfo->lock); | |
1875 | data_sinfo->bytes_may_use -= bytes; | |
1876 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
1877 | spin_unlock(&data_sinfo->lock); | |
1878 | } | |
1879 | ||
1880 | /* called when we are adding a delalloc extent to the inode's io_tree */ | |
1881 | void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode, | |
1882 | u64 bytes) | |
1883 | { | |
1884 | struct btrfs_space_info *data_sinfo; | |
1885 | ||
1886 | /* get the space info for where this inode will be storing its data */ | |
1887 | data_sinfo = BTRFS_I(inode)->space_info; | |
1888 | ||
1889 | /* make sure we have enough space to handle the data first */ | |
1890 | spin_lock(&data_sinfo->lock); | |
1891 | data_sinfo->bytes_delalloc += bytes; | |
1892 | ||
1893 | /* | |
1894 | * we are adding a delalloc extent without calling | |
1895 | * btrfs_check_data_free_space first. This happens on a weird | |
1896 | * writepage condition, but shouldn't hurt our accounting | |
1897 | */ | |
1898 | if (unlikely(bytes > BTRFS_I(inode)->reserved_bytes)) { | |
1899 | data_sinfo->bytes_may_use -= BTRFS_I(inode)->reserved_bytes; | |
1900 | BTRFS_I(inode)->reserved_bytes = 0; | |
1901 | } else { | |
1902 | data_sinfo->bytes_may_use -= bytes; | |
1903 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
1904 | } | |
1905 | ||
1906 | spin_unlock(&data_sinfo->lock); | |
1907 | } | |
1908 | ||
1909 | /* called when we are clearing an delalloc extent from the inode's io_tree */ | |
1910 | void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, | |
1911 | u64 bytes) | |
1912 | { | |
1913 | struct btrfs_space_info *info; | |
1914 | ||
1915 | info = BTRFS_I(inode)->space_info; | |
1916 | ||
1917 | spin_lock(&info->lock); | |
1918 | info->bytes_delalloc -= bytes; | |
1919 | spin_unlock(&info->lock); | |
1920 | } | |
1921 | ||
6324fbf3 CM |
1922 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1923 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 1924 | u64 flags, int force) |
6324fbf3 CM |
1925 | { |
1926 | struct btrfs_space_info *space_info; | |
1927 | u64 thresh; | |
c146afad YZ |
1928 | int ret = 0; |
1929 | ||
1930 | mutex_lock(&extent_root->fs_info->chunk_mutex); | |
6324fbf3 | 1931 | |
2b82032c | 1932 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1933 | |
6324fbf3 | 1934 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1935 | if (!space_info) { |
1936 | ret = update_space_info(extent_root->fs_info, flags, | |
1937 | 0, 0, &space_info); | |
1938 | BUG_ON(ret); | |
1939 | } | |
6324fbf3 CM |
1940 | BUG_ON(!space_info); |
1941 | ||
25179201 | 1942 | spin_lock(&space_info->lock); |
0ef3e66b CM |
1943 | if (space_info->force_alloc) { |
1944 | force = 1; | |
1945 | space_info->force_alloc = 0; | |
1946 | } | |
25179201 JB |
1947 | if (space_info->full) { |
1948 | spin_unlock(&space_info->lock); | |
925baedd | 1949 | goto out; |
25179201 | 1950 | } |
6324fbf3 | 1951 | |
c146afad YZ |
1952 | thresh = space_info->total_bytes - space_info->bytes_readonly; |
1953 | thresh = div_factor(thresh, 6); | |
0ef3e66b | 1954 | if (!force && |
e8569813 | 1955 | (space_info->bytes_used + space_info->bytes_pinned + |
25179201 JB |
1956 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
1957 | spin_unlock(&space_info->lock); | |
925baedd | 1958 | goto out; |
25179201 | 1959 | } |
25179201 JB |
1960 | spin_unlock(&space_info->lock); |
1961 | ||
2b82032c | 1962 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
d397712b | 1963 | if (ret) |
6324fbf3 | 1964 | space_info->full = 1; |
a74a4b97 | 1965 | out: |
c146afad | 1966 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 1967 | return ret; |
6324fbf3 CM |
1968 | } |
1969 | ||
9078a3e1 CM |
1970 | static int update_block_group(struct btrfs_trans_handle *trans, |
1971 | struct btrfs_root *root, | |
db94535d | 1972 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 1973 | int mark_free) |
9078a3e1 CM |
1974 | { |
1975 | struct btrfs_block_group_cache *cache; | |
1976 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 1977 | u64 total = num_bytes; |
9078a3e1 | 1978 | u64 old_val; |
db94535d | 1979 | u64 byte_in_group; |
3e1ad54f | 1980 | |
d397712b | 1981 | while (total) { |
db94535d | 1982 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 1983 | if (!cache) |
9078a3e1 | 1984 | return -1; |
db94535d CM |
1985 | byte_in_group = bytenr - cache->key.objectid; |
1986 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 1987 | |
25179201 | 1988 | spin_lock(&cache->space_info->lock); |
c286ac48 | 1989 | spin_lock(&cache->lock); |
0f9dd46c | 1990 | cache->dirty = 1; |
9078a3e1 | 1991 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 1992 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 1993 | if (alloc) { |
db94535d | 1994 | old_val += num_bytes; |
6324fbf3 | 1995 | cache->space_info->bytes_used += num_bytes; |
a512bbf8 | 1996 | if (cache->ro) |
c146afad | 1997 | cache->space_info->bytes_readonly -= num_bytes; |
c286ac48 CM |
1998 | btrfs_set_block_group_used(&cache->item, old_val); |
1999 | spin_unlock(&cache->lock); | |
25179201 | 2000 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 2001 | } else { |
db94535d | 2002 | old_val -= num_bytes; |
6324fbf3 | 2003 | cache->space_info->bytes_used -= num_bytes; |
c146afad YZ |
2004 | if (cache->ro) |
2005 | cache->space_info->bytes_readonly += num_bytes; | |
c286ac48 CM |
2006 | btrfs_set_block_group_used(&cache->item, old_val); |
2007 | spin_unlock(&cache->lock); | |
25179201 | 2008 | spin_unlock(&cache->space_info->lock); |
f510cfec | 2009 | if (mark_free) { |
0f9dd46c | 2010 | int ret; |
1f3c79a2 LH |
2011 | |
2012 | ret = btrfs_discard_extent(root, bytenr, | |
2013 | num_bytes); | |
2014 | WARN_ON(ret); | |
2015 | ||
0f9dd46c JB |
2016 | ret = btrfs_add_free_space(cache, bytenr, |
2017 | num_bytes); | |
d2fb3437 | 2018 | WARN_ON(ret); |
e37c9e69 | 2019 | } |
cd1bc465 | 2020 | } |
d2fb3437 | 2021 | put_block_group(cache); |
db94535d CM |
2022 | total -= num_bytes; |
2023 | bytenr += num_bytes; | |
9078a3e1 CM |
2024 | } |
2025 | return 0; | |
2026 | } | |
6324fbf3 | 2027 | |
a061fc8d CM |
2028 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
2029 | { | |
0f9dd46c | 2030 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 2031 | u64 bytenr; |
0f9dd46c JB |
2032 | |
2033 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
2034 | if (!cache) | |
a061fc8d | 2035 | return 0; |
0f9dd46c | 2036 | |
d2fb3437 YZ |
2037 | bytenr = cache->key.objectid; |
2038 | put_block_group(cache); | |
2039 | ||
2040 | return bytenr; | |
a061fc8d CM |
2041 | } |
2042 | ||
e02119d5 | 2043 | int btrfs_update_pinned_extents(struct btrfs_root *root, |
324ae4df Y |
2044 | u64 bytenr, u64 num, int pin) |
2045 | { | |
2046 | u64 len; | |
2047 | struct btrfs_block_group_cache *cache; | |
2048 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2049 | ||
25179201 | 2050 | WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex)); |
324ae4df Y |
2051 | if (pin) { |
2052 | set_extent_dirty(&fs_info->pinned_extents, | |
2053 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2054 | } else { | |
2055 | clear_extent_dirty(&fs_info->pinned_extents, | |
2056 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2057 | } | |
b9473439 CM |
2058 | mutex_unlock(&root->fs_info->pinned_mutex); |
2059 | ||
324ae4df Y |
2060 | while (num > 0) { |
2061 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
e8569813 ZY |
2062 | BUG_ON(!cache); |
2063 | len = min(num, cache->key.offset - | |
2064 | (bytenr - cache->key.objectid)); | |
324ae4df | 2065 | if (pin) { |
25179201 | 2066 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2067 | spin_lock(&cache->lock); |
2068 | cache->pinned += len; | |
2069 | cache->space_info->bytes_pinned += len; | |
2070 | spin_unlock(&cache->lock); | |
25179201 | 2071 | spin_unlock(&cache->space_info->lock); |
324ae4df Y |
2072 | fs_info->total_pinned += len; |
2073 | } else { | |
25179201 | 2074 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2075 | spin_lock(&cache->lock); |
2076 | cache->pinned -= len; | |
2077 | cache->space_info->bytes_pinned -= len; | |
2078 | spin_unlock(&cache->lock); | |
25179201 | 2079 | spin_unlock(&cache->space_info->lock); |
324ae4df | 2080 | fs_info->total_pinned -= len; |
07103a3c JB |
2081 | if (cache->cached) |
2082 | btrfs_add_free_space(cache, bytenr, len); | |
324ae4df | 2083 | } |
d2fb3437 | 2084 | put_block_group(cache); |
324ae4df Y |
2085 | bytenr += len; |
2086 | num -= len; | |
2087 | } | |
2088 | return 0; | |
2089 | } | |
9078a3e1 | 2090 | |
e8569813 ZY |
2091 | static int update_reserved_extents(struct btrfs_root *root, |
2092 | u64 bytenr, u64 num, int reserve) | |
2093 | { | |
2094 | u64 len; | |
2095 | struct btrfs_block_group_cache *cache; | |
2096 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2097 | ||
e8569813 ZY |
2098 | while (num > 0) { |
2099 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
2100 | BUG_ON(!cache); | |
2101 | len = min(num, cache->key.offset - | |
2102 | (bytenr - cache->key.objectid)); | |
25179201 JB |
2103 | |
2104 | spin_lock(&cache->space_info->lock); | |
2105 | spin_lock(&cache->lock); | |
e8569813 | 2106 | if (reserve) { |
e8569813 ZY |
2107 | cache->reserved += len; |
2108 | cache->space_info->bytes_reserved += len; | |
e8569813 | 2109 | } else { |
e8569813 ZY |
2110 | cache->reserved -= len; |
2111 | cache->space_info->bytes_reserved -= len; | |
e8569813 | 2112 | } |
25179201 JB |
2113 | spin_unlock(&cache->lock); |
2114 | spin_unlock(&cache->space_info->lock); | |
d2fb3437 | 2115 | put_block_group(cache); |
e8569813 ZY |
2116 | bytenr += len; |
2117 | num -= len; | |
2118 | } | |
2119 | return 0; | |
2120 | } | |
2121 | ||
d1310b2e | 2122 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 2123 | { |
ccd467d6 | 2124 | u64 last = 0; |
1a5bc167 CM |
2125 | u64 start; |
2126 | u64 end; | |
d1310b2e | 2127 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 2128 | int ret; |
ccd467d6 | 2129 | |
25179201 | 2130 | mutex_lock(&root->fs_info->pinned_mutex); |
d397712b | 2131 | while (1) { |
1a5bc167 CM |
2132 | ret = find_first_extent_bit(pinned_extents, last, |
2133 | &start, &end, EXTENT_DIRTY); | |
2134 | if (ret) | |
ccd467d6 | 2135 | break; |
1a5bc167 CM |
2136 | set_extent_dirty(copy, start, end, GFP_NOFS); |
2137 | last = end + 1; | |
ccd467d6 | 2138 | } |
25179201 | 2139 | mutex_unlock(&root->fs_info->pinned_mutex); |
ccd467d6 CM |
2140 | return 0; |
2141 | } | |
2142 | ||
2143 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
2144 | struct btrfs_root *root, | |
d1310b2e | 2145 | struct extent_io_tree *unpin) |
a28ec197 | 2146 | { |
1a5bc167 CM |
2147 | u64 start; |
2148 | u64 end; | |
a28ec197 | 2149 | int ret; |
a28ec197 | 2150 | |
d397712b | 2151 | while (1) { |
b9473439 | 2152 | mutex_lock(&root->fs_info->pinned_mutex); |
1a5bc167 CM |
2153 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
2154 | EXTENT_DIRTY); | |
2155 | if (ret) | |
a28ec197 | 2156 | break; |
1f3c79a2 LH |
2157 | |
2158 | ret = btrfs_discard_extent(root, start, end + 1 - start); | |
2159 | ||
b9473439 | 2160 | /* unlocks the pinned mutex */ |
e02119d5 | 2161 | btrfs_update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 | 2162 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
1f3c79a2 | 2163 | |
b9473439 | 2164 | cond_resched(); |
a28ec197 | 2165 | } |
25179201 | 2166 | mutex_unlock(&root->fs_info->pinned_mutex); |
1f3c79a2 | 2167 | return ret; |
a28ec197 CM |
2168 | } |
2169 | ||
31840ae1 ZY |
2170 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
2171 | struct btrfs_root *root, | |
b9473439 CM |
2172 | struct btrfs_path *path, |
2173 | u64 bytenr, u64 num_bytes, int is_data, | |
2174 | struct extent_buffer **must_clean) | |
e20d96d6 | 2175 | { |
1a5bc167 | 2176 | int err = 0; |
31840ae1 | 2177 | struct extent_buffer *buf; |
8ef97622 | 2178 | |
31840ae1 ZY |
2179 | if (is_data) |
2180 | goto pinit; | |
2181 | ||
2182 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); | |
2183 | if (!buf) | |
2184 | goto pinit; | |
2185 | ||
2186 | /* we can reuse a block if it hasn't been written | |
2187 | * and it is from this transaction. We can't | |
2188 | * reuse anything from the tree log root because | |
2189 | * it has tiny sub-transactions. | |
2190 | */ | |
2191 | if (btrfs_buffer_uptodate(buf, 0) && | |
2192 | btrfs_try_tree_lock(buf)) { | |
2193 | u64 header_owner = btrfs_header_owner(buf); | |
2194 | u64 header_transid = btrfs_header_generation(buf); | |
2195 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && | |
1a40e23b | 2196 | header_owner != BTRFS_TREE_RELOC_OBJECTID && |
56bec294 | 2197 | header_owner != BTRFS_DATA_RELOC_TREE_OBJECTID && |
31840ae1 ZY |
2198 | header_transid == trans->transid && |
2199 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
b9473439 | 2200 | *must_clean = buf; |
31840ae1 | 2201 | return 1; |
8ef97622 | 2202 | } |
31840ae1 | 2203 | btrfs_tree_unlock(buf); |
f4b9aa8d | 2204 | } |
31840ae1 ZY |
2205 | free_extent_buffer(buf); |
2206 | pinit: | |
b9473439 CM |
2207 | btrfs_set_path_blocking(path); |
2208 | mutex_lock(&root->fs_info->pinned_mutex); | |
2209 | /* unlocks the pinned mutex */ | |
31840ae1 ZY |
2210 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); |
2211 | ||
be744175 | 2212 | BUG_ON(err < 0); |
e20d96d6 CM |
2213 | return 0; |
2214 | } | |
2215 | ||
fec577fb | 2216 | /* |
a28ec197 | 2217 | * remove an extent from the root, returns 0 on success |
fec577fb | 2218 | */ |
31840ae1 ZY |
2219 | static int __free_extent(struct btrfs_trans_handle *trans, |
2220 | struct btrfs_root *root, | |
2221 | u64 bytenr, u64 num_bytes, u64 parent, | |
7bb86316 | 2222 | u64 root_objectid, u64 ref_generation, |
56bec294 CM |
2223 | u64 owner_objectid, int pin, int mark_free, |
2224 | int refs_to_drop) | |
a28ec197 | 2225 | { |
5caf2a00 | 2226 | struct btrfs_path *path; |
e2fa7227 | 2227 | struct btrfs_key key; |
1261ec42 CM |
2228 | struct btrfs_fs_info *info = root->fs_info; |
2229 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 2230 | struct extent_buffer *leaf; |
a28ec197 | 2231 | int ret; |
952fccac CM |
2232 | int extent_slot = 0; |
2233 | int found_extent = 0; | |
2234 | int num_to_del = 1; | |
234b63a0 | 2235 | struct btrfs_extent_item *ei; |
cf27e1ee | 2236 | u32 refs; |
037e6390 | 2237 | |
db94535d | 2238 | key.objectid = bytenr; |
62e2749e | 2239 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 2240 | key.offset = num_bytes; |
5caf2a00 | 2241 | path = btrfs_alloc_path(); |
54aa1f4d CM |
2242 | if (!path) |
2243 | return -ENOMEM; | |
5f26f772 | 2244 | |
3c12ac72 | 2245 | path->reada = 1; |
b9473439 | 2246 | path->leave_spinning = 1; |
3bb1a1bc YZ |
2247 | ret = lookup_extent_backref(trans, extent_root, path, |
2248 | bytenr, parent, root_objectid, | |
2249 | ref_generation, owner_objectid, 1); | |
7bb86316 | 2250 | if (ret == 0) { |
952fccac CM |
2251 | struct btrfs_key found_key; |
2252 | extent_slot = path->slots[0]; | |
d397712b | 2253 | while (extent_slot > 0) { |
952fccac CM |
2254 | extent_slot--; |
2255 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2256 | extent_slot); | |
2257 | if (found_key.objectid != bytenr) | |
2258 | break; | |
2259 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
2260 | found_key.offset == num_bytes) { | |
2261 | found_extent = 1; | |
2262 | break; | |
2263 | } | |
2264 | if (path->slots[0] - extent_slot > 5) | |
2265 | break; | |
2266 | } | |
31840ae1 | 2267 | if (!found_extent) { |
56bec294 CM |
2268 | ret = remove_extent_backref(trans, extent_root, path, |
2269 | refs_to_drop); | |
31840ae1 ZY |
2270 | BUG_ON(ret); |
2271 | btrfs_release_path(extent_root, path); | |
b9473439 | 2272 | path->leave_spinning = 1; |
31840ae1 ZY |
2273 | ret = btrfs_search_slot(trans, extent_root, |
2274 | &key, path, -1, 1); | |
f3465ca4 JB |
2275 | if (ret) { |
2276 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
2277 | ", was looking for %llu\n", ret, |
2278 | (unsigned long long)bytenr); | |
f3465ca4 JB |
2279 | btrfs_print_leaf(extent_root, path->nodes[0]); |
2280 | } | |
31840ae1 ZY |
2281 | BUG_ON(ret); |
2282 | extent_slot = path->slots[0]; | |
2283 | } | |
7bb86316 CM |
2284 | } else { |
2285 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
2286 | WARN_ON(1); | |
d397712b | 2287 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
56bec294 | 2288 | "parent %llu root %llu gen %llu owner %llu\n", |
d397712b | 2289 | (unsigned long long)bytenr, |
56bec294 | 2290 | (unsigned long long)parent, |
d397712b CM |
2291 | (unsigned long long)root_objectid, |
2292 | (unsigned long long)ref_generation, | |
2293 | (unsigned long long)owner_objectid); | |
7bb86316 | 2294 | } |
5f39d397 CM |
2295 | |
2296 | leaf = path->nodes[0]; | |
952fccac | 2297 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 2298 | struct btrfs_extent_item); |
5f39d397 | 2299 | refs = btrfs_extent_refs(leaf, ei); |
952fccac | 2300 | |
56bec294 CM |
2301 | /* |
2302 | * we're not allowed to delete the extent item if there | |
2303 | * are other delayed ref updates pending | |
2304 | */ | |
2305 | ||
2306 | BUG_ON(refs < refs_to_drop); | |
2307 | refs -= refs_to_drop; | |
2308 | btrfs_set_extent_refs(leaf, ei, refs); | |
5f39d397 CM |
2309 | btrfs_mark_buffer_dirty(leaf); |
2310 | ||
56bec294 CM |
2311 | if (refs == 0 && found_extent && |
2312 | path->slots[0] == extent_slot + 1) { | |
31840ae1 ZY |
2313 | struct btrfs_extent_ref *ref; |
2314 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
2315 | struct btrfs_extent_ref); | |
56bec294 | 2316 | BUG_ON(btrfs_ref_num_refs(leaf, ref) != refs_to_drop); |
952fccac CM |
2317 | /* if the back ref and the extent are next to each other |
2318 | * they get deleted below in one shot | |
2319 | */ | |
2320 | path->slots[0] = extent_slot; | |
2321 | num_to_del = 2; | |
2322 | } else if (found_extent) { | |
2323 | /* otherwise delete the extent back ref */ | |
56bec294 CM |
2324 | ret = remove_extent_backref(trans, extent_root, path, |
2325 | refs_to_drop); | |
952fccac CM |
2326 | BUG_ON(ret); |
2327 | /* if refs are 0, we need to setup the path for deletion */ | |
2328 | if (refs == 0) { | |
2329 | btrfs_release_path(extent_root, path); | |
b9473439 | 2330 | path->leave_spinning = 1; |
952fccac CM |
2331 | ret = btrfs_search_slot(trans, extent_root, &key, path, |
2332 | -1, 1); | |
952fccac CM |
2333 | BUG_ON(ret); |
2334 | } | |
2335 | } | |
2336 | ||
cf27e1ee | 2337 | if (refs == 0) { |
db94535d CM |
2338 | u64 super_used; |
2339 | u64 root_used; | |
b9473439 | 2340 | struct extent_buffer *must_clean = NULL; |
78fae27e CM |
2341 | |
2342 | if (pin) { | |
b9473439 CM |
2343 | ret = pin_down_bytes(trans, root, path, |
2344 | bytenr, num_bytes, | |
2345 | owner_objectid >= BTRFS_FIRST_FREE_OBJECTID, | |
2346 | &must_clean); | |
c549228f Y |
2347 | if (ret > 0) |
2348 | mark_free = 1; | |
2349 | BUG_ON(ret < 0); | |
78fae27e | 2350 | } |
b9473439 | 2351 | |
58176a96 | 2352 | /* block accounting for super block */ |
75eff68e | 2353 | spin_lock(&info->delalloc_lock); |
db94535d CM |
2354 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2355 | btrfs_set_super_bytes_used(&info->super_copy, | |
2356 | super_used - num_bytes); | |
58176a96 JB |
2357 | |
2358 | /* block accounting for root item */ | |
db94535d | 2359 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 2360 | btrfs_set_root_used(&root->root_item, |
db94535d | 2361 | root_used - num_bytes); |
34bf63c4 | 2362 | spin_unlock(&info->delalloc_lock); |
b9473439 CM |
2363 | |
2364 | /* | |
2365 | * it is going to be very rare for someone to be waiting | |
2366 | * on the block we're freeing. del_items might need to | |
2367 | * schedule, so rather than get fancy, just force it | |
2368 | * to blocking here | |
2369 | */ | |
2370 | if (must_clean) | |
2371 | btrfs_set_lock_blocking(must_clean); | |
2372 | ||
952fccac CM |
2373 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
2374 | num_to_del); | |
31840ae1 | 2375 | BUG_ON(ret); |
25179201 | 2376 | btrfs_release_path(extent_root, path); |
21af804c | 2377 | |
b9473439 CM |
2378 | if (must_clean) { |
2379 | clean_tree_block(NULL, root, must_clean); | |
2380 | btrfs_tree_unlock(must_clean); | |
2381 | free_extent_buffer(must_clean); | |
2382 | } | |
2383 | ||
459931ec CM |
2384 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
2385 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); | |
2386 | BUG_ON(ret); | |
d57e62b8 CM |
2387 | } else { |
2388 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
2389 | bytenr >> PAGE_CACHE_SHIFT, | |
2390 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
2391 | } |
2392 | ||
dcbdd4dc CM |
2393 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
2394 | mark_free); | |
2395 | BUG_ON(ret); | |
a28ec197 | 2396 | } |
5caf2a00 | 2397 | btrfs_free_path(path); |
a28ec197 CM |
2398 | return ret; |
2399 | } | |
2400 | ||
fec577fb CM |
2401 | /* |
2402 | * remove an extent from the root, returns 0 on success | |
2403 | */ | |
925baedd | 2404 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
56bec294 CM |
2405 | struct btrfs_root *root, |
2406 | u64 bytenr, u64 num_bytes, u64 parent, | |
2407 | u64 root_objectid, u64 ref_generation, | |
2408 | u64 owner_objectid, int pin, | |
2409 | int refs_to_drop) | |
fec577fb | 2410 | { |
db94535d | 2411 | WARN_ON(num_bytes < root->sectorsize); |
31840ae1 | 2412 | |
56bec294 CM |
2413 | /* |
2414 | * if metadata always pin | |
2415 | * if data pin when any transaction has committed this | |
2416 | */ | |
2417 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID || | |
2418 | ref_generation != trans->transid) | |
4bef0848 CM |
2419 | pin = 1; |
2420 | ||
4bef0848 CM |
2421 | if (ref_generation != trans->transid) |
2422 | pin = 1; | |
2423 | ||
56bec294 | 2424 | return __free_extent(trans, root, bytenr, num_bytes, parent, |
3bb1a1bc | 2425 | root_objectid, ref_generation, |
56bec294 | 2426 | owner_objectid, pin, pin == 0, refs_to_drop); |
fec577fb CM |
2427 | } |
2428 | ||
1887be66 CM |
2429 | /* |
2430 | * when we free an extent, it is possible (and likely) that we free the last | |
2431 | * delayed ref for that extent as well. This searches the delayed ref tree for | |
2432 | * a given extent, and if there are no other delayed refs to be processed, it | |
2433 | * removes it from the tree. | |
2434 | */ | |
2435 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
2436 | struct btrfs_root *root, u64 bytenr) | |
2437 | { | |
2438 | struct btrfs_delayed_ref_head *head; | |
2439 | struct btrfs_delayed_ref_root *delayed_refs; | |
2440 | struct btrfs_delayed_ref_node *ref; | |
2441 | struct rb_node *node; | |
2442 | int ret; | |
2443 | ||
2444 | delayed_refs = &trans->transaction->delayed_refs; | |
2445 | spin_lock(&delayed_refs->lock); | |
2446 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2447 | if (!head) | |
2448 | goto out; | |
2449 | ||
2450 | node = rb_prev(&head->node.rb_node); | |
2451 | if (!node) | |
2452 | goto out; | |
2453 | ||
2454 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2455 | ||
2456 | /* there are still entries for this ref, we can't drop it */ | |
2457 | if (ref->bytenr == bytenr) | |
2458 | goto out; | |
2459 | ||
2460 | /* | |
2461 | * waiting for the lock here would deadlock. If someone else has it | |
2462 | * locked they are already in the process of dropping it anyway | |
2463 | */ | |
2464 | if (!mutex_trylock(&head->mutex)) | |
2465 | goto out; | |
2466 | ||
2467 | /* | |
2468 | * at this point we have a head with no other entries. Go | |
2469 | * ahead and process it. | |
2470 | */ | |
2471 | head->node.in_tree = 0; | |
2472 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 2473 | |
1887be66 CM |
2474 | delayed_refs->num_entries--; |
2475 | ||
2476 | /* | |
2477 | * we don't take a ref on the node because we're removing it from the | |
2478 | * tree, so we just steal the ref the tree was holding. | |
2479 | */ | |
c3e69d58 CM |
2480 | delayed_refs->num_heads--; |
2481 | if (list_empty(&head->cluster)) | |
2482 | delayed_refs->num_heads_ready--; | |
2483 | ||
2484 | list_del_init(&head->cluster); | |
1887be66 CM |
2485 | spin_unlock(&delayed_refs->lock); |
2486 | ||
2487 | ret = run_one_delayed_ref(trans, root->fs_info->tree_root, | |
2488 | &head->node, head->must_insert_reserved); | |
2489 | BUG_ON(ret); | |
2490 | btrfs_put_delayed_ref(&head->node); | |
2491 | return 0; | |
2492 | out: | |
2493 | spin_unlock(&delayed_refs->lock); | |
2494 | return 0; | |
2495 | } | |
2496 | ||
925baedd | 2497 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2498 | struct btrfs_root *root, |
2499 | u64 bytenr, u64 num_bytes, u64 parent, | |
2500 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2501 | u64 owner_objectid, int pin) |
925baedd CM |
2502 | { |
2503 | int ret; | |
2504 | ||
56bec294 CM |
2505 | /* |
2506 | * tree log blocks never actually go into the extent allocation | |
2507 | * tree, just update pinning info and exit early. | |
2508 | * | |
2509 | * data extents referenced by the tree log do need to have | |
2510 | * their reference counts bumped. | |
2511 | */ | |
2512 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID && | |
2513 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
2514 | mutex_lock(&root->fs_info->pinned_mutex); | |
b9473439 CM |
2515 | |
2516 | /* unlocks the pinned mutex */ | |
56bec294 | 2517 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); |
56bec294 CM |
2518 | update_reserved_extents(root, bytenr, num_bytes, 0); |
2519 | ret = 0; | |
2520 | } else { | |
2521 | ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, | |
2522 | root_objectid, ref_generation, | |
2523 | owner_objectid, | |
2524 | BTRFS_DROP_DELAYED_REF, 1); | |
1887be66 CM |
2525 | BUG_ON(ret); |
2526 | ret = check_ref_cleanup(trans, root, bytenr); | |
2527 | BUG_ON(ret); | |
56bec294 | 2528 | } |
925baedd CM |
2529 | return ret; |
2530 | } | |
2531 | ||
87ee04eb CM |
2532 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
2533 | { | |
2534 | u64 mask = ((u64)root->stripesize - 1); | |
2535 | u64 ret = (val + mask) & ~mask; | |
2536 | return ret; | |
2537 | } | |
2538 | ||
fec577fb CM |
2539 | /* |
2540 | * walks the btree of allocated extents and find a hole of a given size. | |
2541 | * The key ins is changed to record the hole: | |
2542 | * ins->objectid == block start | |
62e2749e | 2543 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
2544 | * ins->offset == number of blocks |
2545 | * Any available blocks before search_start are skipped. | |
2546 | */ | |
d397712b | 2547 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
2548 | struct btrfs_root *orig_root, |
2549 | u64 num_bytes, u64 empty_size, | |
2550 | u64 search_start, u64 search_end, | |
2551 | u64 hint_byte, struct btrfs_key *ins, | |
2552 | u64 exclude_start, u64 exclude_nr, | |
2553 | int data) | |
fec577fb | 2554 | { |
80eb234a | 2555 | int ret = 0; |
d397712b | 2556 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
db94535d | 2557 | u64 total_needed = num_bytes; |
239b14b3 | 2558 | u64 *last_ptr = NULL; |
4366211c | 2559 | u64 last_wanted = 0; |
80eb234a | 2560 | struct btrfs_block_group_cache *block_group = NULL; |
0ef3e66b | 2561 | int chunk_alloc_done = 0; |
239b14b3 | 2562 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 2563 | int allowed_chunk_alloc = 0; |
80eb234a JB |
2564 | struct list_head *head = NULL, *cur = NULL; |
2565 | int loop = 0; | |
f5a31e16 | 2566 | int extra_loop = 0; |
80eb234a | 2567 | struct btrfs_space_info *space_info; |
fec577fb | 2568 | |
db94535d | 2569 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 2570 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
2571 | ins->objectid = 0; |
2572 | ins->offset = 0; | |
b1a4d965 | 2573 | |
0ef3e66b CM |
2574 | if (orig_root->ref_cows || empty_size) |
2575 | allowed_chunk_alloc = 1; | |
2576 | ||
239b14b3 CM |
2577 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
2578 | last_ptr = &root->fs_info->last_alloc; | |
536ac8ae CM |
2579 | if (!btrfs_test_opt(root, SSD)) |
2580 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
2581 | } |
2582 | ||
0f9dd46c | 2583 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) |
239b14b3 | 2584 | last_ptr = &root->fs_info->last_data_alloc; |
0f9dd46c | 2585 | |
239b14b3 | 2586 | if (last_ptr) { |
4366211c | 2587 | if (*last_ptr) { |
239b14b3 | 2588 | hint_byte = *last_ptr; |
4366211c CM |
2589 | last_wanted = *last_ptr; |
2590 | } else | |
239b14b3 | 2591 | empty_size += empty_cluster; |
4366211c CM |
2592 | } else { |
2593 | empty_cluster = 0; | |
239b14b3 | 2594 | } |
a061fc8d | 2595 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 2596 | search_start = max(search_start, hint_byte); |
0b86a832 | 2597 | |
42e70e7a | 2598 | if (last_wanted && search_start != last_wanted) { |
4366211c | 2599 | last_wanted = 0; |
42e70e7a CM |
2600 | empty_size += empty_cluster; |
2601 | } | |
4366211c | 2602 | |
42e70e7a | 2603 | total_needed += empty_size; |
80eb234a | 2604 | block_group = btrfs_lookup_block_group(root->fs_info, search_start); |
d899e052 YZ |
2605 | if (!block_group) |
2606 | block_group = btrfs_lookup_first_block_group(root->fs_info, | |
2607 | search_start); | |
80eb234a | 2608 | space_info = __find_space_info(root->fs_info, data); |
0f9dd46c | 2609 | |
80eb234a JB |
2610 | down_read(&space_info->groups_sem); |
2611 | while (1) { | |
2612 | struct btrfs_free_space *free_space; | |
0f9dd46c | 2613 | /* |
80eb234a JB |
2614 | * the only way this happens if our hint points to a block |
2615 | * group thats not of the proper type, while looping this | |
2616 | * should never happen | |
0f9dd46c | 2617 | */ |
8a1413a2 CM |
2618 | if (empty_size) |
2619 | extra_loop = 1; | |
2620 | ||
42e70e7a CM |
2621 | if (!block_group) |
2622 | goto new_group_no_lock; | |
2623 | ||
ea6a478e JB |
2624 | if (unlikely(!block_group->cached)) { |
2625 | mutex_lock(&block_group->cache_mutex); | |
2626 | ret = cache_block_group(root, block_group); | |
2627 | mutex_unlock(&block_group->cache_mutex); | |
2628 | if (ret) | |
2629 | break; | |
2630 | } | |
2631 | ||
25179201 | 2632 | mutex_lock(&block_group->alloc_mutex); |
80eb234a | 2633 | if (unlikely(!block_group_bits(block_group, data))) |
0f9dd46c | 2634 | goto new_group; |
0f9dd46c | 2635 | |
ea6a478e | 2636 | if (unlikely(block_group->ro)) |
80eb234a | 2637 | goto new_group; |
0f9dd46c | 2638 | |
80eb234a JB |
2639 | free_space = btrfs_find_free_space(block_group, search_start, |
2640 | total_needed); | |
2641 | if (free_space) { | |
2642 | u64 start = block_group->key.objectid; | |
2643 | u64 end = block_group->key.objectid + | |
0f9dd46c | 2644 | block_group->key.offset; |
239b14b3 | 2645 | |
80eb234a | 2646 | search_start = stripe_align(root, free_space->offset); |
0f9dd46c | 2647 | |
80eb234a JB |
2648 | /* move on to the next group */ |
2649 | if (search_start + num_bytes >= search_end) | |
2650 | goto new_group; | |
e37c9e69 | 2651 | |
80eb234a JB |
2652 | /* move on to the next group */ |
2653 | if (search_start + num_bytes > end) | |
2654 | goto new_group; | |
2655 | ||
4366211c | 2656 | if (last_wanted && search_start != last_wanted) { |
3b7885bf | 2657 | total_needed += empty_cluster; |
8a1413a2 | 2658 | empty_size += empty_cluster; |
4366211c | 2659 | last_wanted = 0; |
3b7885bf CM |
2660 | /* |
2661 | * if search_start is still in this block group | |
2662 | * then we just re-search this block group | |
2663 | */ | |
2664 | if (search_start >= start && | |
2665 | search_start < end) { | |
2666 | mutex_unlock(&block_group->alloc_mutex); | |
2667 | continue; | |
2668 | } | |
2669 | ||
2670 | /* else we go to the next block group */ | |
2671 | goto new_group; | |
2672 | } | |
2673 | ||
80eb234a JB |
2674 | if (exclude_nr > 0 && |
2675 | (search_start + num_bytes > exclude_start && | |
2676 | search_start < exclude_start + exclude_nr)) { | |
2677 | search_start = exclude_start + exclude_nr; | |
2678 | /* | |
2679 | * if search_start is still in this block group | |
2680 | * then we just re-search this block group | |
2681 | */ | |
2682 | if (search_start >= start && | |
25179201 JB |
2683 | search_start < end) { |
2684 | mutex_unlock(&block_group->alloc_mutex); | |
4366211c | 2685 | last_wanted = 0; |
80eb234a | 2686 | continue; |
25179201 | 2687 | } |
80eb234a JB |
2688 | |
2689 | /* else we go to the next block group */ | |
2690 | goto new_group; | |
2691 | } | |
2692 | ||
2693 | ins->objectid = search_start; | |
2694 | ins->offset = num_bytes; | |
25179201 JB |
2695 | |
2696 | btrfs_remove_free_space_lock(block_group, search_start, | |
2697 | num_bytes); | |
80eb234a | 2698 | /* we are all good, lets return */ |
25179201 | 2699 | mutex_unlock(&block_group->alloc_mutex); |
80eb234a | 2700 | break; |
0f9dd46c | 2701 | } |
80eb234a | 2702 | new_group: |
42e70e7a | 2703 | mutex_unlock(&block_group->alloc_mutex); |
d2fb3437 YZ |
2704 | put_block_group(block_group); |
2705 | block_group = NULL; | |
42e70e7a | 2706 | new_group_no_lock: |
f5a31e16 CM |
2707 | /* don't try to compare new allocations against the |
2708 | * last allocation any more | |
2709 | */ | |
4366211c | 2710 | last_wanted = 0; |
f5a31e16 | 2711 | |
80eb234a JB |
2712 | /* |
2713 | * Here's how this works. | |
2714 | * loop == 0: we were searching a block group via a hint | |
2715 | * and didn't find anything, so we start at | |
2716 | * the head of the block groups and keep searching | |
2717 | * loop == 1: we're searching through all of the block groups | |
2718 | * if we hit the head again we have searched | |
2719 | * all of the block groups for this space and we | |
2720 | * need to try and allocate, if we cant error out. | |
2721 | * loop == 2: we allocated more space and are looping through | |
2722 | * all of the block groups again. | |
2723 | */ | |
2724 | if (loop == 0) { | |
2725 | head = &space_info->block_groups; | |
2726 | cur = head->next; | |
80eb234a JB |
2727 | loop++; |
2728 | } else if (loop == 1 && cur == head) { | |
f5a31e16 CM |
2729 | int keep_going; |
2730 | ||
2731 | /* at this point we give up on the empty_size | |
2732 | * allocations and just try to allocate the min | |
2733 | * space. | |
2734 | * | |
2735 | * The extra_loop field was set if an empty_size | |
2736 | * allocation was attempted above, and if this | |
2737 | * is try we need to try the loop again without | |
2738 | * the additional empty_size. | |
2739 | */ | |
5b7c3fcc CM |
2740 | total_needed -= empty_size; |
2741 | empty_size = 0; | |
f5a31e16 CM |
2742 | keep_going = extra_loop; |
2743 | loop++; | |
42e70e7a | 2744 | |
80eb234a JB |
2745 | if (allowed_chunk_alloc && !chunk_alloc_done) { |
2746 | up_read(&space_info->groups_sem); | |
2747 | ret = do_chunk_alloc(trans, root, num_bytes + | |
2748 | 2 * 1024 * 1024, data, 1); | |
80eb234a | 2749 | down_read(&space_info->groups_sem); |
2ed6d664 CM |
2750 | if (ret < 0) |
2751 | goto loop_check; | |
80eb234a | 2752 | head = &space_info->block_groups; |
f5a31e16 CM |
2753 | /* |
2754 | * we've allocated a new chunk, keep | |
2755 | * trying | |
2756 | */ | |
2757 | keep_going = 1; | |
80eb234a JB |
2758 | chunk_alloc_done = 1; |
2759 | } else if (!allowed_chunk_alloc) { | |
2760 | space_info->force_alloc = 1; | |
f5a31e16 | 2761 | } |
2ed6d664 | 2762 | loop_check: |
f5a31e16 CM |
2763 | if (keep_going) { |
2764 | cur = head->next; | |
2765 | extra_loop = 0; | |
80eb234a JB |
2766 | } else { |
2767 | break; | |
2768 | } | |
2769 | } else if (cur == head) { | |
2770 | break; | |
0f9dd46c | 2771 | } |
0b86a832 | 2772 | |
80eb234a JB |
2773 | block_group = list_entry(cur, struct btrfs_block_group_cache, |
2774 | list); | |
d2fb3437 YZ |
2775 | atomic_inc(&block_group->count); |
2776 | ||
80eb234a JB |
2777 | search_start = block_group->key.objectid; |
2778 | cur = cur->next; | |
f2654de4 | 2779 | } |
0b86a832 | 2780 | |
80eb234a JB |
2781 | /* we found what we needed */ |
2782 | if (ins->objectid) { | |
2783 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
d2fb3437 | 2784 | trans->block_group = block_group->key.objectid; |
0f9dd46c | 2785 | |
80eb234a JB |
2786 | if (last_ptr) |
2787 | *last_ptr = ins->objectid + ins->offset; | |
2788 | ret = 0; | |
2789 | } else if (!ret) { | |
d397712b CM |
2790 | printk(KERN_ERR "btrfs searching for %llu bytes, " |
2791 | "num_bytes %llu, loop %d, allowed_alloc %d\n", | |
2792 | (unsigned long long)total_needed, | |
2793 | (unsigned long long)num_bytes, | |
4ce4cb52 | 2794 | loop, allowed_chunk_alloc); |
80eb234a | 2795 | ret = -ENOSPC; |
be744175 | 2796 | } |
d2fb3437 YZ |
2797 | if (block_group) |
2798 | put_block_group(block_group); | |
be744175 | 2799 | |
80eb234a | 2800 | up_read(&space_info->groups_sem); |
0f70abe2 | 2801 | return ret; |
fec577fb | 2802 | } |
ec44a35c | 2803 | |
0f9dd46c JB |
2804 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes) |
2805 | { | |
2806 | struct btrfs_block_group_cache *cache; | |
0f9dd46c | 2807 | |
d397712b CM |
2808 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
2809 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
2810 | info->bytes_pinned - info->bytes_reserved), | |
2811 | (info->full) ? "" : "not "); | |
6a63209f JB |
2812 | printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu," |
2813 | " may_use=%llu, used=%llu\n", info->total_bytes, | |
2814 | info->bytes_pinned, info->bytes_delalloc, info->bytes_may_use, | |
2815 | info->bytes_used); | |
0f9dd46c | 2816 | |
80eb234a | 2817 | down_read(&info->groups_sem); |
c6e30871 | 2818 | list_for_each_entry(cache, &info->block_groups, list) { |
0f9dd46c | 2819 | spin_lock(&cache->lock); |
d397712b CM |
2820 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
2821 | "%llu pinned %llu reserved\n", | |
2822 | (unsigned long long)cache->key.objectid, | |
2823 | (unsigned long long)cache->key.offset, | |
2824 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
2825 | (unsigned long long)cache->pinned, | |
2826 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
2827 | btrfs_dump_free_space(cache, bytes); |
2828 | spin_unlock(&cache->lock); | |
2829 | } | |
80eb234a | 2830 | up_read(&info->groups_sem); |
0f9dd46c | 2831 | } |
e8569813 | 2832 | |
e6dcd2dc CM |
2833 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
2834 | struct btrfs_root *root, | |
2835 | u64 num_bytes, u64 min_alloc_size, | |
2836 | u64 empty_size, u64 hint_byte, | |
2837 | u64 search_end, struct btrfs_key *ins, | |
2838 | u64 data) | |
fec577fb CM |
2839 | { |
2840 | int ret; | |
fbdc762b | 2841 | u64 search_start = 0; |
1261ec42 | 2842 | struct btrfs_fs_info *info = root->fs_info; |
925baedd | 2843 | |
6a63209f | 2844 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 2845 | again: |
0ef3e66b CM |
2846 | /* |
2847 | * the only place that sets empty_size is btrfs_realloc_node, which | |
2848 | * is not called recursively on allocations | |
2849 | */ | |
2850 | if (empty_size || root->ref_cows) { | |
593060d7 | 2851 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 2852 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
2853 | 2 * 1024 * 1024, |
2854 | BTRFS_BLOCK_GROUP_METADATA | | |
2855 | (info->metadata_alloc_profile & | |
2856 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
2857 | } |
2858 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 2859 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 | 2860 | } |
0b86a832 | 2861 | |
db94535d CM |
2862 | WARN_ON(num_bytes < root->sectorsize); |
2863 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
2864 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
2865 | trans->alloc_exclude_start, |
2866 | trans->alloc_exclude_nr, data); | |
3b951516 | 2867 | |
98d20f67 CM |
2868 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
2869 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 2870 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 2871 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
2872 | do_chunk_alloc(trans, root->fs_info->extent_root, |
2873 | num_bytes, data, 1); | |
98d20f67 CM |
2874 | goto again; |
2875 | } | |
ec44a35c | 2876 | if (ret) { |
0f9dd46c JB |
2877 | struct btrfs_space_info *sinfo; |
2878 | ||
2879 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
2880 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
2881 | "wanted %llu\n", (unsigned long long)data, | |
2882 | (unsigned long long)num_bytes); | |
0f9dd46c | 2883 | dump_space_info(sinfo, num_bytes); |
925baedd | 2884 | BUG(); |
925baedd | 2885 | } |
0f9dd46c JB |
2886 | |
2887 | return ret; | |
e6dcd2dc CM |
2888 | } |
2889 | ||
65b51a00 CM |
2890 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
2891 | { | |
0f9dd46c | 2892 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 2893 | int ret = 0; |
0f9dd46c | 2894 | |
0f9dd46c JB |
2895 | cache = btrfs_lookup_block_group(root->fs_info, start); |
2896 | if (!cache) { | |
d397712b CM |
2897 | printk(KERN_ERR "Unable to find block group for %llu\n", |
2898 | (unsigned long long)start); | |
0f9dd46c JB |
2899 | return -ENOSPC; |
2900 | } | |
1f3c79a2 LH |
2901 | |
2902 | ret = btrfs_discard_extent(root, start, len); | |
2903 | ||
0f9dd46c | 2904 | btrfs_add_free_space(cache, start, len); |
d2fb3437 | 2905 | put_block_group(cache); |
1a40e23b | 2906 | update_reserved_extents(root, start, len, 0); |
1f3c79a2 LH |
2907 | |
2908 | return ret; | |
65b51a00 CM |
2909 | } |
2910 | ||
e6dcd2dc CM |
2911 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
2912 | struct btrfs_root *root, | |
2913 | u64 num_bytes, u64 min_alloc_size, | |
2914 | u64 empty_size, u64 hint_byte, | |
2915 | u64 search_end, struct btrfs_key *ins, | |
2916 | u64 data) | |
2917 | { | |
2918 | int ret; | |
e6dcd2dc CM |
2919 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, |
2920 | empty_size, hint_byte, search_end, ins, | |
2921 | data); | |
e8569813 | 2922 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
e6dcd2dc CM |
2923 | return ret; |
2924 | } | |
2925 | ||
2926 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 2927 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 2928 | u64 root_objectid, u64 ref_generation, |
56bec294 CM |
2929 | u64 owner, struct btrfs_key *ins, |
2930 | int ref_mod) | |
e6dcd2dc CM |
2931 | { |
2932 | int ret; | |
e6dcd2dc CM |
2933 | u64 super_used; |
2934 | u64 root_used; | |
2935 | u64 num_bytes = ins->offset; | |
2936 | u32 sizes[2]; | |
2937 | struct btrfs_fs_info *info = root->fs_info; | |
2938 | struct btrfs_root *extent_root = info->extent_root; | |
2939 | struct btrfs_extent_item *extent_item; | |
2940 | struct btrfs_extent_ref *ref; | |
2941 | struct btrfs_path *path; | |
2942 | struct btrfs_key keys[2]; | |
fec577fb | 2943 | |
31840ae1 ZY |
2944 | if (parent == 0) |
2945 | parent = ins->objectid; | |
2946 | ||
58176a96 | 2947 | /* block accounting for super block */ |
75eff68e | 2948 | spin_lock(&info->delalloc_lock); |
db94535d CM |
2949 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2950 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
26b8003f | 2951 | |
58176a96 | 2952 | /* block accounting for root item */ |
db94535d CM |
2953 | root_used = btrfs_root_used(&root->root_item); |
2954 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
34bf63c4 | 2955 | spin_unlock(&info->delalloc_lock); |
58176a96 | 2956 | |
47e4bb98 | 2957 | memcpy(&keys[0], ins, sizeof(*ins)); |
47e4bb98 CM |
2958 | keys[1].objectid = ins->objectid; |
2959 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 2960 | keys[1].offset = parent; |
47e4bb98 CM |
2961 | sizes[0] = sizeof(*extent_item); |
2962 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
2963 | |
2964 | path = btrfs_alloc_path(); | |
2965 | BUG_ON(!path); | |
47e4bb98 | 2966 | |
b9473439 | 2967 | path->leave_spinning = 1; |
47e4bb98 CM |
2968 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, |
2969 | sizes, 2); | |
ccd467d6 | 2970 | BUG_ON(ret); |
0f9dd46c | 2971 | |
47e4bb98 CM |
2972 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2973 | struct btrfs_extent_item); | |
56bec294 | 2974 | btrfs_set_extent_refs(path->nodes[0], extent_item, ref_mod); |
47e4bb98 CM |
2975 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
2976 | struct btrfs_extent_ref); | |
2977 | ||
2978 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
2979 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
2980 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
56bec294 | 2981 | btrfs_set_ref_num_refs(path->nodes[0], ref, ref_mod); |
47e4bb98 CM |
2982 | |
2983 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2984 | ||
2985 | trans->alloc_exclude_start = 0; | |
2986 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 2987 | btrfs_free_path(path); |
f510cfec | 2988 | |
925baedd CM |
2989 | if (ret) |
2990 | goto out; | |
26b8003f | 2991 | |
d397712b CM |
2992 | ret = update_block_group(trans, root, ins->objectid, |
2993 | ins->offset, 1, 0); | |
f5947066 | 2994 | if (ret) { |
d397712b CM |
2995 | printk(KERN_ERR "btrfs update block group failed for %llu " |
2996 | "%llu\n", (unsigned long long)ins->objectid, | |
2997 | (unsigned long long)ins->offset); | |
f5947066 CM |
2998 | BUG(); |
2999 | } | |
925baedd | 3000 | out: |
e6dcd2dc CM |
3001 | return ret; |
3002 | } | |
3003 | ||
3004 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3005 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 3006 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3007 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
3008 | { |
3009 | int ret; | |
1c2308f8 CM |
3010 | |
3011 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) | |
3012 | return 0; | |
56bec294 CM |
3013 | |
3014 | ret = btrfs_add_delayed_ref(trans, ins->objectid, | |
3015 | ins->offset, parent, root_objectid, | |
3016 | ref_generation, owner, | |
3017 | BTRFS_ADD_DELAYED_EXTENT, 0); | |
3018 | BUG_ON(ret); | |
e6dcd2dc CM |
3019 | return ret; |
3020 | } | |
e02119d5 CM |
3021 | |
3022 | /* | |
3023 | * this is used by the tree logging recovery code. It records that | |
3024 | * an extent has been allocated and makes sure to clear the free | |
3025 | * space cache bits as well | |
3026 | */ | |
3027 | int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3028 | struct btrfs_root *root, u64 parent, |
e02119d5 | 3029 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3030 | u64 owner, struct btrfs_key *ins) |
e02119d5 CM |
3031 | { |
3032 | int ret; | |
3033 | struct btrfs_block_group_cache *block_group; | |
3034 | ||
e02119d5 | 3035 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
ea6a478e | 3036 | mutex_lock(&block_group->cache_mutex); |
e02119d5 | 3037 | cache_block_group(root, block_group); |
ea6a478e | 3038 | mutex_unlock(&block_group->cache_mutex); |
e02119d5 | 3039 | |
ea6a478e JB |
3040 | ret = btrfs_remove_free_space(block_group, ins->objectid, |
3041 | ins->offset); | |
0f9dd46c | 3042 | BUG_ON(ret); |
d2fb3437 | 3043 | put_block_group(block_group); |
3bb1a1bc | 3044 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
56bec294 | 3045 | ref_generation, owner, ins, 1); |
e02119d5 CM |
3046 | return ret; |
3047 | } | |
3048 | ||
e6dcd2dc CM |
3049 | /* |
3050 | * finds a free extent and does all the dirty work required for allocation | |
3051 | * returns the key for the extent through ins, and a tree buffer for | |
3052 | * the first block of the extent through buf. | |
3053 | * | |
3054 | * returns 0 if everything worked, non-zero otherwise. | |
3055 | */ | |
3056 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, | |
3057 | struct btrfs_root *root, | |
31840ae1 | 3058 | u64 num_bytes, u64 parent, u64 min_alloc_size, |
e6dcd2dc | 3059 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3060 | u64 owner_objectid, u64 empty_size, u64 hint_byte, |
e6dcd2dc CM |
3061 | u64 search_end, struct btrfs_key *ins, u64 data) |
3062 | { | |
3063 | int ret; | |
e6dcd2dc CM |
3064 | ret = __btrfs_reserve_extent(trans, root, num_bytes, |
3065 | min_alloc_size, empty_size, hint_byte, | |
3066 | search_end, ins, data); | |
3067 | BUG_ON(ret); | |
d00aff00 | 3068 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
56bec294 CM |
3069 | ret = btrfs_add_delayed_ref(trans, ins->objectid, |
3070 | ins->offset, parent, root_objectid, | |
3071 | ref_generation, owner_objectid, | |
3072 | BTRFS_ADD_DELAYED_EXTENT, 0); | |
d00aff00 | 3073 | BUG_ON(ret); |
d00aff00 | 3074 | } |
56bec294 | 3075 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
925baedd | 3076 | return ret; |
fec577fb | 3077 | } |
65b51a00 CM |
3078 | |
3079 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, | |
3080 | struct btrfs_root *root, | |
4008c04a CM |
3081 | u64 bytenr, u32 blocksize, |
3082 | int level) | |
65b51a00 CM |
3083 | { |
3084 | struct extent_buffer *buf; | |
3085 | ||
3086 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
3087 | if (!buf) | |
3088 | return ERR_PTR(-ENOMEM); | |
3089 | btrfs_set_header_generation(buf, trans->transid); | |
4008c04a | 3090 | btrfs_set_buffer_lockdep_class(buf, level); |
65b51a00 CM |
3091 | btrfs_tree_lock(buf); |
3092 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
3093 | |
3094 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 3095 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 3096 | |
d0c803c4 CM |
3097 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
3098 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
3099 | buf->start + buf->len - 1, GFP_NOFS); | |
3100 | } else { | |
3101 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 3102 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 3103 | } |
65b51a00 | 3104 | trans->blocks_used++; |
b4ce94de | 3105 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
3106 | return buf; |
3107 | } | |
3108 | ||
fec577fb CM |
3109 | /* |
3110 | * helper function to allocate a block for a given tree | |
3111 | * returns the tree buffer or NULL. | |
3112 | */ | |
5f39d397 | 3113 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
7bb86316 | 3114 | struct btrfs_root *root, |
31840ae1 | 3115 | u32 blocksize, u64 parent, |
7bb86316 CM |
3116 | u64 root_objectid, |
3117 | u64 ref_generation, | |
7bb86316 CM |
3118 | int level, |
3119 | u64 hint, | |
5f39d397 | 3120 | u64 empty_size) |
fec577fb | 3121 | { |
e2fa7227 | 3122 | struct btrfs_key ins; |
fec577fb | 3123 | int ret; |
5f39d397 | 3124 | struct extent_buffer *buf; |
fec577fb | 3125 | |
31840ae1 | 3126 | ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, |
3bb1a1bc | 3127 | root_objectid, ref_generation, level, |
31840ae1 | 3128 | empty_size, hint, (u64)-1, &ins, 0); |
fec577fb | 3129 | if (ret) { |
54aa1f4d CM |
3130 | BUG_ON(ret > 0); |
3131 | return ERR_PTR(ret); | |
fec577fb | 3132 | } |
55c69072 | 3133 | |
4008c04a CM |
3134 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
3135 | blocksize, level); | |
fec577fb CM |
3136 | return buf; |
3137 | } | |
a28ec197 | 3138 | |
e02119d5 CM |
3139 | int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, |
3140 | struct btrfs_root *root, struct extent_buffer *leaf) | |
6407bf6d | 3141 | { |
7bb86316 CM |
3142 | u64 leaf_owner; |
3143 | u64 leaf_generation; | |
bd56b302 | 3144 | struct refsort *sorted; |
5f39d397 | 3145 | struct btrfs_key key; |
6407bf6d CM |
3146 | struct btrfs_file_extent_item *fi; |
3147 | int i; | |
3148 | int nritems; | |
3149 | int ret; | |
bd56b302 CM |
3150 | int refi = 0; |
3151 | int slot; | |
6407bf6d | 3152 | |
5f39d397 CM |
3153 | BUG_ON(!btrfs_is_leaf(leaf)); |
3154 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
3155 | leaf_owner = btrfs_header_owner(leaf); |
3156 | leaf_generation = btrfs_header_generation(leaf); | |
3157 | ||
bd56b302 CM |
3158 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); |
3159 | /* we do this loop twice. The first time we build a list | |
3160 | * of the extents we have a reference on, then we sort the list | |
3161 | * by bytenr. The second time around we actually do the | |
3162 | * extent freeing. | |
3163 | */ | |
6407bf6d | 3164 | for (i = 0; i < nritems; i++) { |
db94535d | 3165 | u64 disk_bytenr; |
e34a5b4f | 3166 | cond_resched(); |
5f39d397 CM |
3167 | |
3168 | btrfs_item_key_to_cpu(leaf, &key, i); | |
bd56b302 CM |
3169 | |
3170 | /* only extents have references, skip everything else */ | |
5f39d397 | 3171 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
6407bf6d | 3172 | continue; |
bd56b302 | 3173 | |
6407bf6d | 3174 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
bd56b302 CM |
3175 | |
3176 | /* inline extents live in the btree, they don't have refs */ | |
5f39d397 CM |
3177 | if (btrfs_file_extent_type(leaf, fi) == |
3178 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 3179 | continue; |
bd56b302 | 3180 | |
db94535d | 3181 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
bd56b302 CM |
3182 | |
3183 | /* holes don't have refs */ | |
db94535d | 3184 | if (disk_bytenr == 0) |
3a686375 | 3185 | continue; |
4a096752 | 3186 | |
bd56b302 CM |
3187 | sorted[refi].bytenr = disk_bytenr; |
3188 | sorted[refi].slot = i; | |
3189 | refi++; | |
3190 | } | |
3191 | ||
3192 | if (refi == 0) | |
3193 | goto out; | |
3194 | ||
3195 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); | |
3196 | ||
3197 | for (i = 0; i < refi; i++) { | |
3198 | u64 disk_bytenr; | |
3199 | ||
3200 | disk_bytenr = sorted[i].bytenr; | |
3201 | slot = sorted[i].slot; | |
3202 | ||
3203 | cond_resched(); | |
3204 | ||
3205 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
3206 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
3207 | continue; | |
3208 | ||
3209 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
3210 | ||
56bec294 | 3211 | ret = btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 | 3212 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
31840ae1 | 3213 | leaf->start, leaf_owner, leaf_generation, |
3bb1a1bc | 3214 | key.objectid, 0); |
31840ae1 | 3215 | BUG_ON(ret); |
2dd3e67b CM |
3216 | |
3217 | atomic_inc(&root->fs_info->throttle_gen); | |
3218 | wake_up(&root->fs_info->transaction_throttle); | |
3219 | cond_resched(); | |
6407bf6d | 3220 | } |
bd56b302 CM |
3221 | out: |
3222 | kfree(sorted); | |
6407bf6d CM |
3223 | return 0; |
3224 | } | |
3225 | ||
d397712b | 3226 | static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans, |
e02119d5 CM |
3227 | struct btrfs_root *root, |
3228 | struct btrfs_leaf_ref *ref) | |
31153d81 YZ |
3229 | { |
3230 | int i; | |
3231 | int ret; | |
bd56b302 CM |
3232 | struct btrfs_extent_info *info; |
3233 | struct refsort *sorted; | |
3234 | ||
3235 | if (ref->nritems == 0) | |
3236 | return 0; | |
31153d81 | 3237 | |
bd56b302 CM |
3238 | sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS); |
3239 | for (i = 0; i < ref->nritems; i++) { | |
3240 | sorted[i].bytenr = ref->extents[i].bytenr; | |
3241 | sorted[i].slot = i; | |
3242 | } | |
3243 | sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL); | |
3244 | ||
3245 | /* | |
3246 | * the items in the ref were sorted when the ref was inserted | |
3247 | * into the ref cache, so this is already in order | |
3248 | */ | |
31153d81 | 3249 | for (i = 0; i < ref->nritems; i++) { |
bd56b302 | 3250 | info = ref->extents + sorted[i].slot; |
56bec294 | 3251 | ret = btrfs_free_extent(trans, root, info->bytenr, |
31840ae1 ZY |
3252 | info->num_bytes, ref->bytenr, |
3253 | ref->owner, ref->generation, | |
3bb1a1bc | 3254 | info->objectid, 0); |
2dd3e67b CM |
3255 | |
3256 | atomic_inc(&root->fs_info->throttle_gen); | |
3257 | wake_up(&root->fs_info->transaction_throttle); | |
3258 | cond_resched(); | |
3259 | ||
31153d81 YZ |
3260 | BUG_ON(ret); |
3261 | info++; | |
3262 | } | |
31153d81 | 3263 | |
806638bc | 3264 | kfree(sorted); |
31153d81 YZ |
3265 | return 0; |
3266 | } | |
3267 | ||
56bec294 CM |
3268 | static int drop_snap_lookup_refcount(struct btrfs_trans_handle *trans, |
3269 | struct btrfs_root *root, u64 start, | |
d397712b | 3270 | u64 len, u32 *refs) |
333db94c | 3271 | { |
017e5369 | 3272 | int ret; |
f87f057b | 3273 | |
56bec294 | 3274 | ret = btrfs_lookup_extent_ref(trans, root, start, len, refs); |
f87f057b CM |
3275 | BUG_ON(ret); |
3276 | ||
d397712b | 3277 | #if 0 /* some debugging code in case we see problems here */ |
f87f057b CM |
3278 | /* if the refs count is one, it won't get increased again. But |
3279 | * if the ref count is > 1, someone may be decreasing it at | |
3280 | * the same time we are. | |
3281 | */ | |
3282 | if (*refs != 1) { | |
3283 | struct extent_buffer *eb = NULL; | |
3284 | eb = btrfs_find_create_tree_block(root, start, len); | |
3285 | if (eb) | |
3286 | btrfs_tree_lock(eb); | |
3287 | ||
3288 | mutex_lock(&root->fs_info->alloc_mutex); | |
3289 | ret = lookup_extent_ref(NULL, root, start, len, refs); | |
3290 | BUG_ON(ret); | |
3291 | mutex_unlock(&root->fs_info->alloc_mutex); | |
3292 | ||
3293 | if (eb) { | |
3294 | btrfs_tree_unlock(eb); | |
3295 | free_extent_buffer(eb); | |
3296 | } | |
3297 | if (*refs == 1) { | |
d397712b CM |
3298 | printk(KERN_ERR "btrfs block %llu went down to one " |
3299 | "during drop_snap\n", (unsigned long long)start); | |
f87f057b CM |
3300 | } |
3301 | ||
3302 | } | |
3303 | #endif | |
3304 | ||
e7a84565 | 3305 | cond_resched(); |
017e5369 | 3306 | return ret; |
333db94c CM |
3307 | } |
3308 | ||
bd56b302 CM |
3309 | /* |
3310 | * this is used while deleting old snapshots, and it drops the refs | |
3311 | * on a whole subtree starting from a level 1 node. | |
3312 | * | |
3313 | * The idea is to sort all the leaf pointers, and then drop the | |
3314 | * ref on all the leaves in order. Most of the time the leaves | |
3315 | * will have ref cache entries, so no leaf IOs will be required to | |
3316 | * find the extents they have references on. | |
3317 | * | |
3318 | * For each leaf, any references it has are also dropped in order | |
3319 | * | |
3320 | * This ends up dropping the references in something close to optimal | |
3321 | * order for reading and modifying the extent allocation tree. | |
3322 | */ | |
3323 | static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans, | |
3324 | struct btrfs_root *root, | |
3325 | struct btrfs_path *path) | |
3326 | { | |
3327 | u64 bytenr; | |
3328 | u64 root_owner; | |
3329 | u64 root_gen; | |
3330 | struct extent_buffer *eb = path->nodes[1]; | |
3331 | struct extent_buffer *leaf; | |
3332 | struct btrfs_leaf_ref *ref; | |
3333 | struct refsort *sorted = NULL; | |
3334 | int nritems = btrfs_header_nritems(eb); | |
3335 | int ret; | |
3336 | int i; | |
3337 | int refi = 0; | |
3338 | int slot = path->slots[1]; | |
3339 | u32 blocksize = btrfs_level_size(root, 0); | |
3340 | u32 refs; | |
3341 | ||
3342 | if (nritems == 0) | |
3343 | goto out; | |
3344 | ||
3345 | root_owner = btrfs_header_owner(eb); | |
3346 | root_gen = btrfs_header_generation(eb); | |
3347 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); | |
3348 | ||
3349 | /* | |
3350 | * step one, sort all the leaf pointers so we don't scribble | |
3351 | * randomly into the extent allocation tree | |
3352 | */ | |
3353 | for (i = slot; i < nritems; i++) { | |
3354 | sorted[refi].bytenr = btrfs_node_blockptr(eb, i); | |
3355 | sorted[refi].slot = i; | |
3356 | refi++; | |
3357 | } | |
3358 | ||
3359 | /* | |
3360 | * nritems won't be zero, but if we're picking up drop_snapshot | |
3361 | * after a crash, slot might be > 0, so double check things | |
3362 | * just in case. | |
3363 | */ | |
3364 | if (refi == 0) | |
3365 | goto out; | |
3366 | ||
3367 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); | |
3368 | ||
3369 | /* | |
3370 | * the first loop frees everything the leaves point to | |
3371 | */ | |
3372 | for (i = 0; i < refi; i++) { | |
3373 | u64 ptr_gen; | |
3374 | ||
3375 | bytenr = sorted[i].bytenr; | |
3376 | ||
3377 | /* | |
3378 | * check the reference count on this leaf. If it is > 1 | |
3379 | * we just decrement it below and don't update any | |
3380 | * of the refs the leaf points to. | |
3381 | */ | |
56bec294 CM |
3382 | ret = drop_snap_lookup_refcount(trans, root, bytenr, |
3383 | blocksize, &refs); | |
bd56b302 CM |
3384 | BUG_ON(ret); |
3385 | if (refs != 1) | |
3386 | continue; | |
3387 | ||
3388 | ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot); | |
3389 | ||
3390 | /* | |
3391 | * the leaf only had one reference, which means the | |
3392 | * only thing pointing to this leaf is the snapshot | |
3393 | * we're deleting. It isn't possible for the reference | |
3394 | * count to increase again later | |
3395 | * | |
3396 | * The reference cache is checked for the leaf, | |
3397 | * and if found we'll be able to drop any refs held by | |
3398 | * the leaf without needing to read it in. | |
3399 | */ | |
3400 | ref = btrfs_lookup_leaf_ref(root, bytenr); | |
3401 | if (ref && ref->generation != ptr_gen) { | |
3402 | btrfs_free_leaf_ref(root, ref); | |
3403 | ref = NULL; | |
3404 | } | |
3405 | if (ref) { | |
3406 | ret = cache_drop_leaf_ref(trans, root, ref); | |
3407 | BUG_ON(ret); | |
3408 | btrfs_remove_leaf_ref(root, ref); | |
3409 | btrfs_free_leaf_ref(root, ref); | |
3410 | } else { | |
3411 | /* | |
3412 | * the leaf wasn't in the reference cache, so | |
3413 | * we have to read it. | |
3414 | */ | |
3415 | leaf = read_tree_block(root, bytenr, blocksize, | |
3416 | ptr_gen); | |
3417 | ret = btrfs_drop_leaf_ref(trans, root, leaf); | |
3418 | BUG_ON(ret); | |
3419 | free_extent_buffer(leaf); | |
3420 | } | |
3421 | atomic_inc(&root->fs_info->throttle_gen); | |
3422 | wake_up(&root->fs_info->transaction_throttle); | |
3423 | cond_resched(); | |
3424 | } | |
3425 | ||
3426 | /* | |
3427 | * run through the loop again to free the refs on the leaves. | |
3428 | * This is faster than doing it in the loop above because | |
3429 | * the leaves are likely to be clustered together. We end up | |
3430 | * working in nice chunks on the extent allocation tree. | |
3431 | */ | |
3432 | for (i = 0; i < refi; i++) { | |
3433 | bytenr = sorted[i].bytenr; | |
56bec294 | 3434 | ret = btrfs_free_extent(trans, root, bytenr, |
bd56b302 CM |
3435 | blocksize, eb->start, |
3436 | root_owner, root_gen, 0, 1); | |
3437 | BUG_ON(ret); | |
3438 | ||
3439 | atomic_inc(&root->fs_info->throttle_gen); | |
3440 | wake_up(&root->fs_info->transaction_throttle); | |
3441 | cond_resched(); | |
3442 | } | |
3443 | out: | |
3444 | kfree(sorted); | |
3445 | ||
3446 | /* | |
3447 | * update the path to show we've processed the entire level 1 | |
3448 | * node. This will get saved into the root's drop_snapshot_progress | |
3449 | * field so these drops are not repeated again if this transaction | |
3450 | * commits. | |
3451 | */ | |
3452 | path->slots[1] = nritems; | |
3453 | return 0; | |
3454 | } | |
3455 | ||
9aca1d51 CM |
3456 | /* |
3457 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
3458 | * counts as it goes. | |
3459 | */ | |
d397712b | 3460 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
98ed5174 CM |
3461 | struct btrfs_root *root, |
3462 | struct btrfs_path *path, int *level) | |
20524f02 | 3463 | { |
7bb86316 CM |
3464 | u64 root_owner; |
3465 | u64 root_gen; | |
3466 | u64 bytenr; | |
ca7a79ad | 3467 | u64 ptr_gen; |
5f39d397 CM |
3468 | struct extent_buffer *next; |
3469 | struct extent_buffer *cur; | |
7bb86316 | 3470 | struct extent_buffer *parent; |
db94535d | 3471 | u32 blocksize; |
20524f02 CM |
3472 | int ret; |
3473 | u32 refs; | |
3474 | ||
5caf2a00 CM |
3475 | WARN_ON(*level < 0); |
3476 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
56bec294 | 3477 | ret = drop_snap_lookup_refcount(trans, root, path->nodes[*level]->start, |
db94535d | 3478 | path->nodes[*level]->len, &refs); |
20524f02 CM |
3479 | BUG_ON(ret); |
3480 | if (refs > 1) | |
3481 | goto out; | |
e011599b | 3482 | |
9aca1d51 CM |
3483 | /* |
3484 | * walk down to the last node level and free all the leaves | |
3485 | */ | |
d397712b | 3486 | while (*level >= 0) { |
5caf2a00 CM |
3487 | WARN_ON(*level < 0); |
3488 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 3489 | cur = path->nodes[*level]; |
e011599b | 3490 | |
5f39d397 | 3491 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 3492 | WARN_ON(1); |
e011599b | 3493 | |
7518a238 | 3494 | if (path->slots[*level] >= |
5f39d397 | 3495 | btrfs_header_nritems(cur)) |
20524f02 | 3496 | break; |
bd56b302 CM |
3497 | |
3498 | /* the new code goes down to level 1 and does all the | |
3499 | * leaves pointed to that node in bulk. So, this check | |
3500 | * for level 0 will always be false. | |
3501 | * | |
3502 | * But, the disk format allows the drop_snapshot_progress | |
3503 | * field in the root to leave things in a state where | |
3504 | * a leaf will need cleaning up here. If someone crashes | |
3505 | * with the old code and then boots with the new code, | |
3506 | * we might find a leaf here. | |
3507 | */ | |
6407bf6d | 3508 | if (*level == 0) { |
e02119d5 | 3509 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
6407bf6d CM |
3510 | BUG_ON(ret); |
3511 | break; | |
3512 | } | |
bd56b302 CM |
3513 | |
3514 | /* | |
3515 | * once we get to level one, process the whole node | |
3516 | * at once, including everything below it. | |
3517 | */ | |
3518 | if (*level == 1) { | |
3519 | ret = drop_level_one_refs(trans, root, path); | |
3520 | BUG_ON(ret); | |
3521 | break; | |
3522 | } | |
3523 | ||
db94535d | 3524 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
ca7a79ad | 3525 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
db94535d | 3526 | blocksize = btrfs_level_size(root, *level - 1); |
925baedd | 3527 | |
56bec294 CM |
3528 | ret = drop_snap_lookup_refcount(trans, root, bytenr, |
3529 | blocksize, &refs); | |
6407bf6d | 3530 | BUG_ON(ret); |
bd56b302 CM |
3531 | |
3532 | /* | |
3533 | * if there is more than one reference, we don't need | |
3534 | * to read that node to drop any references it has. We | |
3535 | * just drop the ref we hold on that node and move on to the | |
3536 | * next slot in this level. | |
3537 | */ | |
6407bf6d | 3538 | if (refs != 1) { |
7bb86316 CM |
3539 | parent = path->nodes[*level]; |
3540 | root_owner = btrfs_header_owner(parent); | |
3541 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 3542 | path->slots[*level]++; |
f87f057b | 3543 | |
56bec294 | 3544 | ret = btrfs_free_extent(trans, root, bytenr, |
31840ae1 | 3545 | blocksize, parent->start, |
3bb1a1bc YZ |
3546 | root_owner, root_gen, |
3547 | *level - 1, 1); | |
20524f02 | 3548 | BUG_ON(ret); |
18e35e0a CM |
3549 | |
3550 | atomic_inc(&root->fs_info->throttle_gen); | |
3551 | wake_up(&root->fs_info->transaction_throttle); | |
2dd3e67b | 3552 | cond_resched(); |
18e35e0a | 3553 | |
20524f02 CM |
3554 | continue; |
3555 | } | |
bd56b302 | 3556 | |
f87f057b | 3557 | /* |
bd56b302 CM |
3558 | * we need to keep freeing things in the next level down. |
3559 | * read the block and loop around to process it | |
f87f057b | 3560 | */ |
bd56b302 | 3561 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); |
5caf2a00 | 3562 | WARN_ON(*level <= 0); |
83e15a28 | 3563 | if (path->nodes[*level-1]) |
5f39d397 | 3564 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 3565 | path->nodes[*level-1] = next; |
5f39d397 | 3566 | *level = btrfs_header_level(next); |
20524f02 | 3567 | path->slots[*level] = 0; |
2dd3e67b | 3568 | cond_resched(); |
20524f02 CM |
3569 | } |
3570 | out: | |
5caf2a00 CM |
3571 | WARN_ON(*level < 0); |
3572 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
3573 | |
3574 | if (path->nodes[*level] == root->node) { | |
7bb86316 | 3575 | parent = path->nodes[*level]; |
31153d81 | 3576 | bytenr = path->nodes[*level]->start; |
7bb86316 CM |
3577 | } else { |
3578 | parent = path->nodes[*level + 1]; | |
31153d81 | 3579 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
7bb86316 CM |
3580 | } |
3581 | ||
31153d81 YZ |
3582 | blocksize = btrfs_level_size(root, *level); |
3583 | root_owner = btrfs_header_owner(parent); | |
7bb86316 | 3584 | root_gen = btrfs_header_generation(parent); |
31153d81 | 3585 | |
bd56b302 CM |
3586 | /* |
3587 | * cleanup and free the reference on the last node | |
3588 | * we processed | |
3589 | */ | |
56bec294 | 3590 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, |
31840ae1 | 3591 | parent->start, root_owner, root_gen, |
3bb1a1bc | 3592 | *level, 1); |
5f39d397 | 3593 | free_extent_buffer(path->nodes[*level]); |
20524f02 | 3594 | path->nodes[*level] = NULL; |
bd56b302 | 3595 | |
20524f02 CM |
3596 | *level += 1; |
3597 | BUG_ON(ret); | |
f87f057b | 3598 | |
e7a84565 | 3599 | cond_resched(); |
20524f02 CM |
3600 | return 0; |
3601 | } | |
3602 | ||
f82d02d9 YZ |
3603 | /* |
3604 | * helper function for drop_subtree, this function is similar to | |
3605 | * walk_down_tree. The main difference is that it checks reference | |
3606 | * counts while tree blocks are locked. | |
3607 | */ | |
d397712b | 3608 | static noinline int walk_down_subtree(struct btrfs_trans_handle *trans, |
f82d02d9 YZ |
3609 | struct btrfs_root *root, |
3610 | struct btrfs_path *path, int *level) | |
3611 | { | |
3612 | struct extent_buffer *next; | |
3613 | struct extent_buffer *cur; | |
3614 | struct extent_buffer *parent; | |
3615 | u64 bytenr; | |
3616 | u64 ptr_gen; | |
3617 | u32 blocksize; | |
3618 | u32 refs; | |
3619 | int ret; | |
3620 | ||
3621 | cur = path->nodes[*level]; | |
3622 | ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len, | |
3623 | &refs); | |
3624 | BUG_ON(ret); | |
3625 | if (refs > 1) | |
3626 | goto out; | |
3627 | ||
3628 | while (*level >= 0) { | |
3629 | cur = path->nodes[*level]; | |
3630 | if (*level == 0) { | |
3631 | ret = btrfs_drop_leaf_ref(trans, root, cur); | |
3632 | BUG_ON(ret); | |
3633 | clean_tree_block(trans, root, cur); | |
3634 | break; | |
3635 | } | |
3636 | if (path->slots[*level] >= btrfs_header_nritems(cur)) { | |
3637 | clean_tree_block(trans, root, cur); | |
3638 | break; | |
3639 | } | |
3640 | ||
3641 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
3642 | blocksize = btrfs_level_size(root, *level - 1); | |
3643 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
3644 | ||
3645 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); | |
3646 | btrfs_tree_lock(next); | |
b4ce94de | 3647 | btrfs_set_lock_blocking(next); |
f82d02d9 YZ |
3648 | |
3649 | ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize, | |
3650 | &refs); | |
3651 | BUG_ON(ret); | |
3652 | if (refs > 1) { | |
3653 | parent = path->nodes[*level]; | |
3654 | ret = btrfs_free_extent(trans, root, bytenr, | |
3655 | blocksize, parent->start, | |
3656 | btrfs_header_owner(parent), | |
3657 | btrfs_header_generation(parent), | |
3658 | *level - 1, 1); | |
3659 | BUG_ON(ret); | |
3660 | path->slots[*level]++; | |
3661 | btrfs_tree_unlock(next); | |
3662 | free_extent_buffer(next); | |
3663 | continue; | |
3664 | } | |
3665 | ||
3666 | *level = btrfs_header_level(next); | |
3667 | path->nodes[*level] = next; | |
3668 | path->slots[*level] = 0; | |
3669 | path->locks[*level] = 1; | |
3670 | cond_resched(); | |
3671 | } | |
3672 | out: | |
3673 | parent = path->nodes[*level + 1]; | |
3674 | bytenr = path->nodes[*level]->start; | |
3675 | blocksize = path->nodes[*level]->len; | |
3676 | ||
3677 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, | |
3678 | parent->start, btrfs_header_owner(parent), | |
3679 | btrfs_header_generation(parent), *level, 1); | |
3680 | BUG_ON(ret); | |
3681 | ||
3682 | if (path->locks[*level]) { | |
3683 | btrfs_tree_unlock(path->nodes[*level]); | |
3684 | path->locks[*level] = 0; | |
3685 | } | |
3686 | free_extent_buffer(path->nodes[*level]); | |
3687 | path->nodes[*level] = NULL; | |
3688 | *level += 1; | |
3689 | cond_resched(); | |
3690 | return 0; | |
3691 | } | |
3692 | ||
9aca1d51 CM |
3693 | /* |
3694 | * helper for dropping snapshots. This walks back up the tree in the path | |
3695 | * to find the first node higher up where we haven't yet gone through | |
3696 | * all the slots | |
3697 | */ | |
d397712b | 3698 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 3699 | struct btrfs_root *root, |
f82d02d9 YZ |
3700 | struct btrfs_path *path, |
3701 | int *level, int max_level) | |
20524f02 | 3702 | { |
7bb86316 CM |
3703 | u64 root_owner; |
3704 | u64 root_gen; | |
3705 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
3706 | int i; |
3707 | int slot; | |
3708 | int ret; | |
9f3a7427 | 3709 | |
f82d02d9 | 3710 | for (i = *level; i < max_level && path->nodes[i]; i++) { |
20524f02 | 3711 | slot = path->slots[i]; |
5f39d397 CM |
3712 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
3713 | struct extent_buffer *node; | |
3714 | struct btrfs_disk_key disk_key; | |
bd56b302 CM |
3715 | |
3716 | /* | |
3717 | * there is more work to do in this level. | |
3718 | * Update the drop_progress marker to reflect | |
3719 | * the work we've done so far, and then bump | |
3720 | * the slot number | |
3721 | */ | |
5f39d397 | 3722 | node = path->nodes[i]; |
20524f02 CM |
3723 | path->slots[i]++; |
3724 | *level = i; | |
9f3a7427 | 3725 | WARN_ON(*level == 0); |
5f39d397 | 3726 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 3727 | memcpy(&root_item->drop_progress, |
5f39d397 | 3728 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 3729 | root_item->drop_level = i; |
20524f02 CM |
3730 | return 0; |
3731 | } else { | |
31840ae1 | 3732 | struct extent_buffer *parent; |
bd56b302 CM |
3733 | |
3734 | /* | |
3735 | * this whole node is done, free our reference | |
3736 | * on it and go up one level | |
3737 | */ | |
31840ae1 ZY |
3738 | if (path->nodes[*level] == root->node) |
3739 | parent = path->nodes[*level]; | |
3740 | else | |
3741 | parent = path->nodes[*level + 1]; | |
3742 | ||
3743 | root_owner = btrfs_header_owner(parent); | |
3744 | root_gen = btrfs_header_generation(parent); | |
f82d02d9 YZ |
3745 | |
3746 | clean_tree_block(trans, root, path->nodes[*level]); | |
e089f05c | 3747 | ret = btrfs_free_extent(trans, root, |
db94535d | 3748 | path->nodes[*level]->start, |
7bb86316 | 3749 | path->nodes[*level]->len, |
3bb1a1bc YZ |
3750 | parent->start, root_owner, |
3751 | root_gen, *level, 1); | |
6407bf6d | 3752 | BUG_ON(ret); |
f82d02d9 YZ |
3753 | if (path->locks[*level]) { |
3754 | btrfs_tree_unlock(path->nodes[*level]); | |
3755 | path->locks[*level] = 0; | |
3756 | } | |
5f39d397 | 3757 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 3758 | path->nodes[*level] = NULL; |
20524f02 | 3759 | *level = i + 1; |
20524f02 CM |
3760 | } |
3761 | } | |
3762 | return 1; | |
3763 | } | |
3764 | ||
9aca1d51 CM |
3765 | /* |
3766 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
3767 | * the tree freeing any blocks that have a ref count of zero after being | |
3768 | * decremented. | |
3769 | */ | |
e089f05c | 3770 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 3771 | *root) |
20524f02 | 3772 | { |
3768f368 | 3773 | int ret = 0; |
9aca1d51 | 3774 | int wret; |
20524f02 | 3775 | int level; |
5caf2a00 | 3776 | struct btrfs_path *path; |
20524f02 CM |
3777 | int i; |
3778 | int orig_level; | |
c3e69d58 | 3779 | int update_count; |
9f3a7427 | 3780 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 3781 | |
a2135011 | 3782 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
5caf2a00 CM |
3783 | path = btrfs_alloc_path(); |
3784 | BUG_ON(!path); | |
20524f02 | 3785 | |
5f39d397 | 3786 | level = btrfs_header_level(root->node); |
20524f02 | 3787 | orig_level = level; |
9f3a7427 CM |
3788 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
3789 | path->nodes[level] = root->node; | |
f510cfec | 3790 | extent_buffer_get(root->node); |
9f3a7427 CM |
3791 | path->slots[level] = 0; |
3792 | } else { | |
3793 | struct btrfs_key key; | |
5f39d397 CM |
3794 | struct btrfs_disk_key found_key; |
3795 | struct extent_buffer *node; | |
6702ed49 | 3796 | |
9f3a7427 | 3797 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
3798 | level = root_item->drop_level; |
3799 | path->lowest_level = level; | |
9f3a7427 | 3800 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 3801 | if (wret < 0) { |
9f3a7427 CM |
3802 | ret = wret; |
3803 | goto out; | |
3804 | } | |
5f39d397 CM |
3805 | node = path->nodes[level]; |
3806 | btrfs_node_key(node, &found_key, path->slots[level]); | |
3807 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
3808 | sizeof(found_key))); | |
7d9eb12c CM |
3809 | /* |
3810 | * unlock our path, this is safe because only this | |
3811 | * function is allowed to delete this snapshot | |
3812 | */ | |
925baedd CM |
3813 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
3814 | if (path->nodes[i] && path->locks[i]) { | |
3815 | path->locks[i] = 0; | |
3816 | btrfs_tree_unlock(path->nodes[i]); | |
3817 | } | |
3818 | } | |
9f3a7427 | 3819 | } |
d397712b | 3820 | while (1) { |
c3e69d58 | 3821 | unsigned long update; |
5caf2a00 | 3822 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 3823 | if (wret > 0) |
20524f02 | 3824 | break; |
9aca1d51 CM |
3825 | if (wret < 0) |
3826 | ret = wret; | |
3827 | ||
f82d02d9 YZ |
3828 | wret = walk_up_tree(trans, root, path, &level, |
3829 | BTRFS_MAX_LEVEL); | |
9aca1d51 | 3830 | if (wret > 0) |
20524f02 | 3831 | break; |
9aca1d51 CM |
3832 | if (wret < 0) |
3833 | ret = wret; | |
b7ec40d7 CM |
3834 | if (trans->transaction->in_commit || |
3835 | trans->transaction->delayed_refs.flushing) { | |
e7a84565 CM |
3836 | ret = -EAGAIN; |
3837 | break; | |
3838 | } | |
18e35e0a | 3839 | atomic_inc(&root->fs_info->throttle_gen); |
017e5369 | 3840 | wake_up(&root->fs_info->transaction_throttle); |
c3e69d58 CM |
3841 | for (update_count = 0; update_count < 16; update_count++) { |
3842 | update = trans->delayed_ref_updates; | |
3843 | trans->delayed_ref_updates = 0; | |
3844 | if (update) | |
3845 | btrfs_run_delayed_refs(trans, root, update); | |
3846 | else | |
3847 | break; | |
3848 | } | |
20524f02 | 3849 | } |
83e15a28 | 3850 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 3851 | if (path->nodes[i]) { |
5f39d397 | 3852 | free_extent_buffer(path->nodes[i]); |
0f82731f | 3853 | path->nodes[i] = NULL; |
83e15a28 | 3854 | } |
20524f02 | 3855 | } |
9f3a7427 | 3856 | out: |
5caf2a00 | 3857 | btrfs_free_path(path); |
9aca1d51 | 3858 | return ret; |
20524f02 | 3859 | } |
9078a3e1 | 3860 | |
f82d02d9 YZ |
3861 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
3862 | struct btrfs_root *root, | |
3863 | struct extent_buffer *node, | |
3864 | struct extent_buffer *parent) | |
3865 | { | |
3866 | struct btrfs_path *path; | |
3867 | int level; | |
3868 | int parent_level; | |
3869 | int ret = 0; | |
3870 | int wret; | |
3871 | ||
3872 | path = btrfs_alloc_path(); | |
3873 | BUG_ON(!path); | |
3874 | ||
b9447ef8 | 3875 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
3876 | parent_level = btrfs_header_level(parent); |
3877 | extent_buffer_get(parent); | |
3878 | path->nodes[parent_level] = parent; | |
3879 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
3880 | ||
b9447ef8 | 3881 | btrfs_assert_tree_locked(node); |
f82d02d9 YZ |
3882 | level = btrfs_header_level(node); |
3883 | extent_buffer_get(node); | |
3884 | path->nodes[level] = node; | |
3885 | path->slots[level] = 0; | |
3886 | ||
3887 | while (1) { | |
3888 | wret = walk_down_subtree(trans, root, path, &level); | |
3889 | if (wret < 0) | |
3890 | ret = wret; | |
3891 | if (wret != 0) | |
3892 | break; | |
3893 | ||
3894 | wret = walk_up_tree(trans, root, path, &level, parent_level); | |
3895 | if (wret < 0) | |
3896 | ret = wret; | |
3897 | if (wret != 0) | |
3898 | break; | |
3899 | } | |
3900 | ||
3901 | btrfs_free_path(path); | |
3902 | return ret; | |
3903 | } | |
3904 | ||
8e7bf94f CM |
3905 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
3906 | unsigned long nr) | |
3907 | { | |
3908 | return min(last, start + nr - 1); | |
3909 | } | |
3910 | ||
d397712b | 3911 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
98ed5174 | 3912 | u64 len) |
edbd8d4e CM |
3913 | { |
3914 | u64 page_start; | |
3915 | u64 page_end; | |
1a40e23b | 3916 | unsigned long first_index; |
edbd8d4e | 3917 | unsigned long last_index; |
edbd8d4e CM |
3918 | unsigned long i; |
3919 | struct page *page; | |
d1310b2e | 3920 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 3921 | struct file_ra_state *ra; |
3eaa2885 | 3922 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
3923 | unsigned int total_read = 0; |
3924 | unsigned int total_dirty = 0; | |
3925 | int ret = 0; | |
4313b399 CM |
3926 | |
3927 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
3928 | |
3929 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 3930 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
3931 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
3932 | ||
1a40e23b ZY |
3933 | /* make sure the dirty trick played by the caller work */ |
3934 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
3935 | first_index, last_index); | |
3936 | if (ret) | |
3937 | goto out_unlock; | |
8e7bf94f | 3938 | |
4313b399 | 3939 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 3940 | |
1a40e23b ZY |
3941 | for (i = first_index ; i <= last_index; i++) { |
3942 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 3943 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 3944 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
3945 | } |
3946 | total_read++; | |
3eaa2885 CM |
3947 | again: |
3948 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 3949 | BUG_ON(1); |
edbd8d4e | 3950 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 3951 | if (!page) { |
1a40e23b | 3952 | ret = -ENOMEM; |
edbd8d4e | 3953 | goto out_unlock; |
a061fc8d | 3954 | } |
edbd8d4e CM |
3955 | if (!PageUptodate(page)) { |
3956 | btrfs_readpage(NULL, page); | |
3957 | lock_page(page); | |
3958 | if (!PageUptodate(page)) { | |
3959 | unlock_page(page); | |
3960 | page_cache_release(page); | |
1a40e23b | 3961 | ret = -EIO; |
edbd8d4e CM |
3962 | goto out_unlock; |
3963 | } | |
3964 | } | |
ec44a35c | 3965 | wait_on_page_writeback(page); |
3eaa2885 | 3966 | |
edbd8d4e CM |
3967 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
3968 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 3969 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 3970 | |
3eaa2885 CM |
3971 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
3972 | if (ordered) { | |
3973 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3974 | unlock_page(page); | |
3975 | page_cache_release(page); | |
3976 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3977 | btrfs_put_ordered_extent(ordered); | |
3978 | goto again; | |
3979 | } | |
3980 | set_page_extent_mapped(page); | |
3981 | ||
1a40e23b ZY |
3982 | if (i == first_index) |
3983 | set_extent_bits(io_tree, page_start, page_end, | |
3984 | EXTENT_BOUNDARY, GFP_NOFS); | |
1f80e4db | 3985 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b | 3986 | |
a061fc8d | 3987 | set_page_dirty(page); |
1a40e23b | 3988 | total_dirty++; |
edbd8d4e | 3989 | |
d1310b2e | 3990 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
3991 | unlock_page(page); |
3992 | page_cache_release(page); | |
3993 | } | |
3994 | ||
3995 | out_unlock: | |
ec44a35c | 3996 | kfree(ra); |
edbd8d4e | 3997 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
3998 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
3999 | return ret; | |
edbd8d4e CM |
4000 | } |
4001 | ||
d397712b | 4002 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
1a40e23b ZY |
4003 | struct btrfs_key *extent_key, |
4004 | u64 offset) | |
4005 | { | |
4006 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
4007 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
4008 | struct extent_map *em; | |
6643558d YZ |
4009 | u64 start = extent_key->objectid - offset; |
4010 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 4011 | |
1a40e23b ZY |
4012 | em = alloc_extent_map(GFP_NOFS); |
4013 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 4014 | |
6643558d | 4015 | em->start = start; |
1a40e23b | 4016 | em->len = extent_key->offset; |
c8b97818 | 4017 | em->block_len = extent_key->offset; |
1a40e23b ZY |
4018 | em->block_start = extent_key->objectid; |
4019 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
4020 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
4021 | ||
4022 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 4023 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
4024 | while (1) { |
4025 | int ret; | |
4026 | spin_lock(&em_tree->lock); | |
4027 | ret = add_extent_mapping(em_tree, em); | |
4028 | spin_unlock(&em_tree->lock); | |
4029 | if (ret != -EEXIST) { | |
4030 | free_extent_map(em); | |
bf4ef679 CM |
4031 | break; |
4032 | } | |
6643558d | 4033 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 4034 | } |
6643558d | 4035 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 4036 | |
6643558d | 4037 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 4038 | } |
edbd8d4e | 4039 | |
1a40e23b ZY |
4040 | struct btrfs_ref_path { |
4041 | u64 extent_start; | |
4042 | u64 nodes[BTRFS_MAX_LEVEL]; | |
4043 | u64 root_objectid; | |
4044 | u64 root_generation; | |
4045 | u64 owner_objectid; | |
1a40e23b ZY |
4046 | u32 num_refs; |
4047 | int lowest_level; | |
4048 | int current_level; | |
f82d02d9 YZ |
4049 | int shared_level; |
4050 | ||
4051 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
4052 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 4053 | }; |
7d9eb12c | 4054 | |
1a40e23b | 4055 | struct disk_extent { |
c8b97818 | 4056 | u64 ram_bytes; |
1a40e23b ZY |
4057 | u64 disk_bytenr; |
4058 | u64 disk_num_bytes; | |
4059 | u64 offset; | |
4060 | u64 num_bytes; | |
c8b97818 CM |
4061 | u8 compression; |
4062 | u8 encryption; | |
4063 | u16 other_encoding; | |
1a40e23b | 4064 | }; |
4313b399 | 4065 | |
1a40e23b ZY |
4066 | static int is_cowonly_root(u64 root_objectid) |
4067 | { | |
4068 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
4069 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
4070 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
4071 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
0403e47e YZ |
4072 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
4073 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1a40e23b ZY |
4074 | return 1; |
4075 | return 0; | |
4076 | } | |
edbd8d4e | 4077 | |
d397712b | 4078 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4079 | struct btrfs_root *extent_root, |
4080 | struct btrfs_ref_path *ref_path, | |
4081 | int first_time) | |
4082 | { | |
4083 | struct extent_buffer *leaf; | |
4084 | struct btrfs_path *path; | |
4085 | struct btrfs_extent_ref *ref; | |
4086 | struct btrfs_key key; | |
4087 | struct btrfs_key found_key; | |
4088 | u64 bytenr; | |
4089 | u32 nritems; | |
4090 | int level; | |
4091 | int ret = 1; | |
edbd8d4e | 4092 | |
1a40e23b ZY |
4093 | path = btrfs_alloc_path(); |
4094 | if (!path) | |
4095 | return -ENOMEM; | |
bf4ef679 | 4096 | |
1a40e23b ZY |
4097 | if (first_time) { |
4098 | ref_path->lowest_level = -1; | |
4099 | ref_path->current_level = -1; | |
f82d02d9 | 4100 | ref_path->shared_level = -1; |
1a40e23b ZY |
4101 | goto walk_up; |
4102 | } | |
4103 | walk_down: | |
4104 | level = ref_path->current_level - 1; | |
4105 | while (level >= -1) { | |
4106 | u64 parent; | |
4107 | if (level < ref_path->lowest_level) | |
4108 | break; | |
bf4ef679 | 4109 | |
d397712b | 4110 | if (level >= 0) |
1a40e23b | 4111 | bytenr = ref_path->nodes[level]; |
d397712b | 4112 | else |
1a40e23b | 4113 | bytenr = ref_path->extent_start; |
1a40e23b | 4114 | BUG_ON(bytenr == 0); |
bf4ef679 | 4115 | |
1a40e23b ZY |
4116 | parent = ref_path->nodes[level + 1]; |
4117 | ref_path->nodes[level + 1] = 0; | |
4118 | ref_path->current_level = level; | |
4119 | BUG_ON(parent == 0); | |
0ef3e66b | 4120 | |
1a40e23b ZY |
4121 | key.objectid = bytenr; |
4122 | key.offset = parent + 1; | |
4123 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 4124 | |
1a40e23b ZY |
4125 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
4126 | if (ret < 0) | |
edbd8d4e | 4127 | goto out; |
1a40e23b | 4128 | BUG_ON(ret == 0); |
7d9eb12c | 4129 | |
1a40e23b ZY |
4130 | leaf = path->nodes[0]; |
4131 | nritems = btrfs_header_nritems(leaf); | |
4132 | if (path->slots[0] >= nritems) { | |
4133 | ret = btrfs_next_leaf(extent_root, path); | |
4134 | if (ret < 0) | |
4135 | goto out; | |
4136 | if (ret > 0) | |
4137 | goto next; | |
4138 | leaf = path->nodes[0]; | |
4139 | } | |
0ef3e66b | 4140 | |
1a40e23b ZY |
4141 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
4142 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
4143 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
4144 | if (level < ref_path->shared_level) | |
4145 | ref_path->shared_level = level; | |
1a40e23b | 4146 | goto found; |
f82d02d9 | 4147 | } |
1a40e23b ZY |
4148 | next: |
4149 | level--; | |
4150 | btrfs_release_path(extent_root, path); | |
d899e052 | 4151 | cond_resched(); |
1a40e23b ZY |
4152 | } |
4153 | /* reached lowest level */ | |
4154 | ret = 1; | |
4155 | goto out; | |
4156 | walk_up: | |
4157 | level = ref_path->current_level; | |
4158 | while (level < BTRFS_MAX_LEVEL - 1) { | |
4159 | u64 ref_objectid; | |
d397712b CM |
4160 | |
4161 | if (level >= 0) | |
1a40e23b | 4162 | bytenr = ref_path->nodes[level]; |
d397712b | 4163 | else |
1a40e23b | 4164 | bytenr = ref_path->extent_start; |
d397712b | 4165 | |
1a40e23b | 4166 | BUG_ON(bytenr == 0); |
edbd8d4e | 4167 | |
1a40e23b ZY |
4168 | key.objectid = bytenr; |
4169 | key.offset = 0; | |
4170 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 4171 | |
1a40e23b ZY |
4172 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
4173 | if (ret < 0) | |
4174 | goto out; | |
edbd8d4e | 4175 | |
1a40e23b ZY |
4176 | leaf = path->nodes[0]; |
4177 | nritems = btrfs_header_nritems(leaf); | |
4178 | if (path->slots[0] >= nritems) { | |
4179 | ret = btrfs_next_leaf(extent_root, path); | |
4180 | if (ret < 0) | |
4181 | goto out; | |
4182 | if (ret > 0) { | |
4183 | /* the extent was freed by someone */ | |
4184 | if (ref_path->lowest_level == level) | |
4185 | goto out; | |
4186 | btrfs_release_path(extent_root, path); | |
4187 | goto walk_down; | |
4188 | } | |
4189 | leaf = path->nodes[0]; | |
4190 | } | |
edbd8d4e | 4191 | |
1a40e23b ZY |
4192 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
4193 | if (found_key.objectid != bytenr || | |
4194 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
4195 | /* the extent was freed by someone */ | |
4196 | if (ref_path->lowest_level == level) { | |
4197 | ret = 1; | |
4198 | goto out; | |
4199 | } | |
4200 | btrfs_release_path(extent_root, path); | |
4201 | goto walk_down; | |
4202 | } | |
4203 | found: | |
4204 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
4205 | struct btrfs_extent_ref); | |
4206 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
4207 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
4208 | if (first_time) { | |
4209 | level = (int)ref_objectid; | |
4210 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
4211 | ref_path->lowest_level = level; | |
4212 | ref_path->current_level = level; | |
4213 | ref_path->nodes[level] = bytenr; | |
4214 | } else { | |
4215 | WARN_ON(ref_objectid != level); | |
4216 | } | |
4217 | } else { | |
4218 | WARN_ON(level != -1); | |
4219 | } | |
4220 | first_time = 0; | |
bf4ef679 | 4221 | |
1a40e23b ZY |
4222 | if (ref_path->lowest_level == level) { |
4223 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
4224 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
4225 | } | |
bf4ef679 | 4226 | |
7d9eb12c | 4227 | /* |
1a40e23b ZY |
4228 | * the block is tree root or the block isn't in reference |
4229 | * counted tree. | |
7d9eb12c | 4230 | */ |
1a40e23b ZY |
4231 | if (found_key.objectid == found_key.offset || |
4232 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
4233 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4234 | ref_path->root_generation = | |
4235 | btrfs_ref_generation(leaf, ref); | |
4236 | if (level < 0) { | |
4237 | /* special reference from the tree log */ | |
4238 | ref_path->nodes[0] = found_key.offset; | |
4239 | ref_path->current_level = 0; | |
4240 | } | |
4241 | ret = 0; | |
4242 | goto out; | |
4243 | } | |
7d9eb12c | 4244 | |
1a40e23b ZY |
4245 | level++; |
4246 | BUG_ON(ref_path->nodes[level] != 0); | |
4247 | ref_path->nodes[level] = found_key.offset; | |
4248 | ref_path->current_level = level; | |
bf4ef679 | 4249 | |
1a40e23b ZY |
4250 | /* |
4251 | * the reference was created in the running transaction, | |
4252 | * no need to continue walking up. | |
4253 | */ | |
4254 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
4255 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4256 | ref_path->root_generation = | |
4257 | btrfs_ref_generation(leaf, ref); | |
4258 | ret = 0; | |
4259 | goto out; | |
7d9eb12c CM |
4260 | } |
4261 | ||
1a40e23b | 4262 | btrfs_release_path(extent_root, path); |
d899e052 | 4263 | cond_resched(); |
7d9eb12c | 4264 | } |
1a40e23b ZY |
4265 | /* reached max tree level, but no tree root found. */ |
4266 | BUG(); | |
edbd8d4e | 4267 | out: |
1a40e23b ZY |
4268 | btrfs_free_path(path); |
4269 | return ret; | |
edbd8d4e CM |
4270 | } |
4271 | ||
1a40e23b ZY |
4272 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
4273 | struct btrfs_root *extent_root, | |
4274 | struct btrfs_ref_path *ref_path, | |
4275 | u64 extent_start) | |
a061fc8d | 4276 | { |
1a40e23b ZY |
4277 | memset(ref_path, 0, sizeof(*ref_path)); |
4278 | ref_path->extent_start = extent_start; | |
a061fc8d | 4279 | |
1a40e23b | 4280 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
4281 | } |
4282 | ||
1a40e23b ZY |
4283 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
4284 | struct btrfs_root *extent_root, | |
4285 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 4286 | { |
1a40e23b ZY |
4287 | return __next_ref_path(trans, extent_root, ref_path, 0); |
4288 | } | |
4289 | ||
d397712b | 4290 | static noinline int get_new_locations(struct inode *reloc_inode, |
1a40e23b ZY |
4291 | struct btrfs_key *extent_key, |
4292 | u64 offset, int no_fragment, | |
4293 | struct disk_extent **extents, | |
4294 | int *nr_extents) | |
4295 | { | |
4296 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
4297 | struct btrfs_path *path; | |
4298 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 4299 | struct extent_buffer *leaf; |
1a40e23b ZY |
4300 | struct disk_extent *exts = *extents; |
4301 | struct btrfs_key found_key; | |
4302 | u64 cur_pos; | |
4303 | u64 last_byte; | |
edbd8d4e | 4304 | u32 nritems; |
1a40e23b ZY |
4305 | int nr = 0; |
4306 | int max = *nr_extents; | |
4307 | int ret; | |
edbd8d4e | 4308 | |
1a40e23b ZY |
4309 | WARN_ON(!no_fragment && *extents); |
4310 | if (!exts) { | |
4311 | max = 1; | |
4312 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
4313 | if (!exts) | |
4314 | return -ENOMEM; | |
a061fc8d | 4315 | } |
edbd8d4e | 4316 | |
1a40e23b ZY |
4317 | path = btrfs_alloc_path(); |
4318 | BUG_ON(!path); | |
edbd8d4e | 4319 | |
1a40e23b ZY |
4320 | cur_pos = extent_key->objectid - offset; |
4321 | last_byte = extent_key->objectid + extent_key->offset; | |
4322 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
4323 | cur_pos, 0); | |
4324 | if (ret < 0) | |
4325 | goto out; | |
4326 | if (ret > 0) { | |
4327 | ret = -ENOENT; | |
4328 | goto out; | |
4329 | } | |
edbd8d4e | 4330 | |
1a40e23b | 4331 | while (1) { |
edbd8d4e CM |
4332 | leaf = path->nodes[0]; |
4333 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
4334 | if (path->slots[0] >= nritems) { |
4335 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
4336 | if (ret < 0) |
4337 | goto out; | |
1a40e23b ZY |
4338 | if (ret > 0) |
4339 | break; | |
bf4ef679 | 4340 | leaf = path->nodes[0]; |
a061fc8d | 4341 | } |
edbd8d4e CM |
4342 | |
4343 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
4344 | if (found_key.offset != cur_pos || |
4345 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
4346 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
4347 | break; |
4348 | ||
1a40e23b ZY |
4349 | fi = btrfs_item_ptr(leaf, path->slots[0], |
4350 | struct btrfs_file_extent_item); | |
4351 | if (btrfs_file_extent_type(leaf, fi) != | |
4352 | BTRFS_FILE_EXTENT_REG || | |
4353 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 4354 | break; |
1a40e23b ZY |
4355 | |
4356 | if (nr == max) { | |
4357 | struct disk_extent *old = exts; | |
4358 | max *= 2; | |
4359 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
4360 | memcpy(exts, old, sizeof(*exts) * nr); | |
4361 | if (old != *extents) | |
4362 | kfree(old); | |
a061fc8d | 4363 | } |
edbd8d4e | 4364 | |
1a40e23b ZY |
4365 | exts[nr].disk_bytenr = |
4366 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
4367 | exts[nr].disk_num_bytes = | |
4368 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4369 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
4370 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
4371 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
4372 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
4373 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
4374 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
4375 | fi); | |
d899e052 YZ |
4376 | BUG_ON(exts[nr].offset > 0); |
4377 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
4378 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 4379 | |
1a40e23b ZY |
4380 | cur_pos += exts[nr].num_bytes; |
4381 | nr++; | |
4382 | ||
4383 | if (cur_pos + offset >= last_byte) | |
4384 | break; | |
4385 | ||
4386 | if (no_fragment) { | |
4387 | ret = 1; | |
edbd8d4e | 4388 | goto out; |
1a40e23b ZY |
4389 | } |
4390 | path->slots[0]++; | |
4391 | } | |
4392 | ||
1f80e4db | 4393 | BUG_ON(cur_pos + offset > last_byte); |
1a40e23b ZY |
4394 | if (cur_pos + offset < last_byte) { |
4395 | ret = -ENOENT; | |
4396 | goto out; | |
edbd8d4e CM |
4397 | } |
4398 | ret = 0; | |
4399 | out: | |
1a40e23b ZY |
4400 | btrfs_free_path(path); |
4401 | if (ret) { | |
4402 | if (exts != *extents) | |
4403 | kfree(exts); | |
4404 | } else { | |
4405 | *extents = exts; | |
4406 | *nr_extents = nr; | |
4407 | } | |
4408 | return ret; | |
4409 | } | |
4410 | ||
d397712b | 4411 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4412 | struct btrfs_root *root, |
4413 | struct btrfs_path *path, | |
4414 | struct btrfs_key *extent_key, | |
4415 | struct btrfs_key *leaf_key, | |
4416 | struct btrfs_ref_path *ref_path, | |
4417 | struct disk_extent *new_extents, | |
4418 | int nr_extents) | |
4419 | { | |
4420 | struct extent_buffer *leaf; | |
4421 | struct btrfs_file_extent_item *fi; | |
4422 | struct inode *inode = NULL; | |
4423 | struct btrfs_key key; | |
4424 | u64 lock_start = 0; | |
4425 | u64 lock_end = 0; | |
4426 | u64 num_bytes; | |
4427 | u64 ext_offset; | |
86288a19 | 4428 | u64 search_end = (u64)-1; |
1a40e23b | 4429 | u32 nritems; |
3bb1a1bc | 4430 | int nr_scaned = 0; |
1a40e23b | 4431 | int extent_locked = 0; |
d899e052 | 4432 | int extent_type; |
1a40e23b ZY |
4433 | int ret; |
4434 | ||
3bb1a1bc | 4435 | memcpy(&key, leaf_key, sizeof(key)); |
1a40e23b | 4436 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
4437 | if (key.objectid < ref_path->owner_objectid || |
4438 | (key.objectid == ref_path->owner_objectid && | |
4439 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
4440 | key.objectid = ref_path->owner_objectid; | |
4441 | key.type = BTRFS_EXTENT_DATA_KEY; | |
4442 | key.offset = 0; | |
4443 | } | |
1a40e23b ZY |
4444 | } |
4445 | ||
4446 | while (1) { | |
4447 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
4448 | if (ret < 0) | |
4449 | goto out; | |
4450 | ||
4451 | leaf = path->nodes[0]; | |
4452 | nritems = btrfs_header_nritems(leaf); | |
4453 | next: | |
4454 | if (extent_locked && ret > 0) { | |
4455 | /* | |
4456 | * the file extent item was modified by someone | |
4457 | * before the extent got locked. | |
4458 | */ | |
1a40e23b ZY |
4459 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4460 | lock_end, GFP_NOFS); | |
4461 | extent_locked = 0; | |
4462 | } | |
4463 | ||
4464 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 4465 | if (++nr_scaned > 2) |
1a40e23b ZY |
4466 | break; |
4467 | ||
4468 | BUG_ON(extent_locked); | |
4469 | ret = btrfs_next_leaf(root, path); | |
4470 | if (ret < 0) | |
4471 | goto out; | |
4472 | if (ret > 0) | |
4473 | break; | |
4474 | leaf = path->nodes[0]; | |
4475 | nritems = btrfs_header_nritems(leaf); | |
4476 | } | |
4477 | ||
4478 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
4479 | ||
4480 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
4481 | if ((key.objectid > ref_path->owner_objectid) || | |
4482 | (key.objectid == ref_path->owner_objectid && | |
4483 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
86288a19 | 4484 | key.offset >= search_end) |
1a40e23b ZY |
4485 | break; |
4486 | } | |
4487 | ||
4488 | if (inode && key.objectid != inode->i_ino) { | |
4489 | BUG_ON(extent_locked); | |
4490 | btrfs_release_path(root, path); | |
4491 | mutex_unlock(&inode->i_mutex); | |
4492 | iput(inode); | |
4493 | inode = NULL; | |
4494 | continue; | |
4495 | } | |
4496 | ||
4497 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
4498 | path->slots[0]++; | |
4499 | ret = 1; | |
4500 | goto next; | |
4501 | } | |
4502 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4503 | struct btrfs_file_extent_item); | |
d899e052 YZ |
4504 | extent_type = btrfs_file_extent_type(leaf, fi); |
4505 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
4506 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
4507 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
4508 | extent_key->objectid)) { | |
4509 | path->slots[0]++; | |
4510 | ret = 1; | |
4511 | goto next; | |
4512 | } | |
4513 | ||
4514 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4515 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
4516 | ||
86288a19 YZ |
4517 | if (search_end == (u64)-1) { |
4518 | search_end = key.offset - ext_offset + | |
4519 | btrfs_file_extent_ram_bytes(leaf, fi); | |
4520 | } | |
1a40e23b ZY |
4521 | |
4522 | if (!extent_locked) { | |
4523 | lock_start = key.offset; | |
4524 | lock_end = lock_start + num_bytes - 1; | |
4525 | } else { | |
6643558d YZ |
4526 | if (lock_start > key.offset || |
4527 | lock_end + 1 < key.offset + num_bytes) { | |
4528 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4529 | lock_start, lock_end, GFP_NOFS); | |
4530 | extent_locked = 0; | |
4531 | } | |
1a40e23b ZY |
4532 | } |
4533 | ||
4534 | if (!inode) { | |
4535 | btrfs_release_path(root, path); | |
4536 | ||
4537 | inode = btrfs_iget_locked(root->fs_info->sb, | |
4538 | key.objectid, root); | |
4539 | if (inode->i_state & I_NEW) { | |
4540 | BTRFS_I(inode)->root = root; | |
4541 | BTRFS_I(inode)->location.objectid = | |
4542 | key.objectid; | |
4543 | BTRFS_I(inode)->location.type = | |
4544 | BTRFS_INODE_ITEM_KEY; | |
4545 | BTRFS_I(inode)->location.offset = 0; | |
4546 | btrfs_read_locked_inode(inode); | |
4547 | unlock_new_inode(inode); | |
4548 | } | |
4549 | /* | |
4550 | * some code call btrfs_commit_transaction while | |
4551 | * holding the i_mutex, so we can't use mutex_lock | |
4552 | * here. | |
4553 | */ | |
4554 | if (is_bad_inode(inode) || | |
4555 | !mutex_trylock(&inode->i_mutex)) { | |
4556 | iput(inode); | |
4557 | inode = NULL; | |
4558 | key.offset = (u64)-1; | |
4559 | goto skip; | |
4560 | } | |
4561 | } | |
4562 | ||
4563 | if (!extent_locked) { | |
4564 | struct btrfs_ordered_extent *ordered; | |
4565 | ||
4566 | btrfs_release_path(root, path); | |
4567 | ||
4568 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
4569 | lock_end, GFP_NOFS); | |
4570 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
4571 | lock_end); | |
4572 | if (ordered && | |
4573 | ordered->file_offset <= lock_end && | |
4574 | ordered->file_offset + ordered->len > lock_start) { | |
4575 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4576 | lock_start, lock_end, GFP_NOFS); | |
4577 | btrfs_start_ordered_extent(inode, ordered, 1); | |
4578 | btrfs_put_ordered_extent(ordered); | |
4579 | key.offset += num_bytes; | |
4580 | goto skip; | |
4581 | } | |
4582 | if (ordered) | |
4583 | btrfs_put_ordered_extent(ordered); | |
4584 | ||
1a40e23b ZY |
4585 | extent_locked = 1; |
4586 | continue; | |
4587 | } | |
4588 | ||
4589 | if (nr_extents == 1) { | |
4590 | /* update extent pointer in place */ | |
1a40e23b ZY |
4591 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4592 | new_extents[0].disk_bytenr); | |
4593 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4594 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
4595 | btrfs_mark_buffer_dirty(leaf); |
4596 | ||
4597 | btrfs_drop_extent_cache(inode, key.offset, | |
4598 | key.offset + num_bytes - 1, 0); | |
4599 | ||
4600 | ret = btrfs_inc_extent_ref(trans, root, | |
4601 | new_extents[0].disk_bytenr, | |
4602 | new_extents[0].disk_num_bytes, | |
4603 | leaf->start, | |
4604 | root->root_key.objectid, | |
4605 | trans->transid, | |
3bb1a1bc | 4606 | key.objectid); |
1a40e23b ZY |
4607 | BUG_ON(ret); |
4608 | ||
4609 | ret = btrfs_free_extent(trans, root, | |
4610 | extent_key->objectid, | |
4611 | extent_key->offset, | |
4612 | leaf->start, | |
4613 | btrfs_header_owner(leaf), | |
4614 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4615 | key.objectid, 0); |
1a40e23b ZY |
4616 | BUG_ON(ret); |
4617 | ||
4618 | btrfs_release_path(root, path); | |
4619 | key.offset += num_bytes; | |
4620 | } else { | |
d899e052 YZ |
4621 | BUG_ON(1); |
4622 | #if 0 | |
1a40e23b ZY |
4623 | u64 alloc_hint; |
4624 | u64 extent_len; | |
4625 | int i; | |
4626 | /* | |
4627 | * drop old extent pointer at first, then insert the | |
4628 | * new pointers one bye one | |
4629 | */ | |
4630 | btrfs_release_path(root, path); | |
4631 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
4632 | key.offset + num_bytes, | |
4633 | key.offset, &alloc_hint); | |
4634 | BUG_ON(ret); | |
4635 | ||
4636 | for (i = 0; i < nr_extents; i++) { | |
4637 | if (ext_offset >= new_extents[i].num_bytes) { | |
4638 | ext_offset -= new_extents[i].num_bytes; | |
4639 | continue; | |
4640 | } | |
4641 | extent_len = min(new_extents[i].num_bytes - | |
4642 | ext_offset, num_bytes); | |
4643 | ||
4644 | ret = btrfs_insert_empty_item(trans, root, | |
4645 | path, &key, | |
4646 | sizeof(*fi)); | |
4647 | BUG_ON(ret); | |
4648 | ||
4649 | leaf = path->nodes[0]; | |
4650 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4651 | struct btrfs_file_extent_item); | |
4652 | btrfs_set_file_extent_generation(leaf, fi, | |
4653 | trans->transid); | |
4654 | btrfs_set_file_extent_type(leaf, fi, | |
4655 | BTRFS_FILE_EXTENT_REG); | |
4656 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
4657 | new_extents[i].disk_bytenr); | |
4658 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4659 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
4660 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
4661 | new_extents[i].ram_bytes); | |
4662 | ||
4663 | btrfs_set_file_extent_compression(leaf, fi, | |
4664 | new_extents[i].compression); | |
4665 | btrfs_set_file_extent_encryption(leaf, fi, | |
4666 | new_extents[i].encryption); | |
4667 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
4668 | new_extents[i].other_encoding); | |
4669 | ||
1a40e23b ZY |
4670 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4671 | extent_len); | |
4672 | ext_offset += new_extents[i].offset; | |
4673 | btrfs_set_file_extent_offset(leaf, fi, | |
4674 | ext_offset); | |
4675 | btrfs_mark_buffer_dirty(leaf); | |
4676 | ||
4677 | btrfs_drop_extent_cache(inode, key.offset, | |
4678 | key.offset + extent_len - 1, 0); | |
4679 | ||
4680 | ret = btrfs_inc_extent_ref(trans, root, | |
4681 | new_extents[i].disk_bytenr, | |
4682 | new_extents[i].disk_num_bytes, | |
4683 | leaf->start, | |
4684 | root->root_key.objectid, | |
3bb1a1bc | 4685 | trans->transid, key.objectid); |
1a40e23b ZY |
4686 | BUG_ON(ret); |
4687 | btrfs_release_path(root, path); | |
4688 | ||
a76a3cd4 | 4689 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
4690 | |
4691 | ext_offset = 0; | |
4692 | num_bytes -= extent_len; | |
4693 | key.offset += extent_len; | |
4694 | ||
4695 | if (num_bytes == 0) | |
4696 | break; | |
4697 | } | |
4698 | BUG_ON(i >= nr_extents); | |
d899e052 | 4699 | #endif |
1a40e23b ZY |
4700 | } |
4701 | ||
4702 | if (extent_locked) { | |
1a40e23b ZY |
4703 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4704 | lock_end, GFP_NOFS); | |
4705 | extent_locked = 0; | |
4706 | } | |
4707 | skip: | |
4708 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
86288a19 | 4709 | key.offset >= search_end) |
1a40e23b ZY |
4710 | break; |
4711 | ||
4712 | cond_resched(); | |
4713 | } | |
4714 | ret = 0; | |
4715 | out: | |
4716 | btrfs_release_path(root, path); | |
4717 | if (inode) { | |
4718 | mutex_unlock(&inode->i_mutex); | |
4719 | if (extent_locked) { | |
1a40e23b ZY |
4720 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4721 | lock_end, GFP_NOFS); | |
4722 | } | |
4723 | iput(inode); | |
4724 | } | |
4725 | return ret; | |
4726 | } | |
4727 | ||
1a40e23b ZY |
4728 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
4729 | struct btrfs_root *root, | |
4730 | struct extent_buffer *buf, u64 orig_start) | |
4731 | { | |
4732 | int level; | |
4733 | int ret; | |
4734 | ||
4735 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
4736 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
4737 | ||
4738 | level = btrfs_header_level(buf); | |
4739 | if (level == 0) { | |
4740 | struct btrfs_leaf_ref *ref; | |
4741 | struct btrfs_leaf_ref *orig_ref; | |
4742 | ||
4743 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
4744 | if (!orig_ref) | |
4745 | return -ENOENT; | |
4746 | ||
4747 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
4748 | if (!ref) { | |
4749 | btrfs_free_leaf_ref(root, orig_ref); | |
4750 | return -ENOMEM; | |
4751 | } | |
4752 | ||
4753 | ref->nritems = orig_ref->nritems; | |
4754 | memcpy(ref->extents, orig_ref->extents, | |
4755 | sizeof(ref->extents[0]) * ref->nritems); | |
4756 | ||
4757 | btrfs_free_leaf_ref(root, orig_ref); | |
4758 | ||
4759 | ref->root_gen = trans->transid; | |
4760 | ref->bytenr = buf->start; | |
4761 | ref->owner = btrfs_header_owner(buf); | |
4762 | ref->generation = btrfs_header_generation(buf); | |
bd56b302 | 4763 | |
1a40e23b ZY |
4764 | ret = btrfs_add_leaf_ref(root, ref, 0); |
4765 | WARN_ON(ret); | |
4766 | btrfs_free_leaf_ref(root, ref); | |
4767 | } | |
4768 | return 0; | |
4769 | } | |
4770 | ||
d397712b | 4771 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
1a40e23b ZY |
4772 | struct extent_buffer *leaf, |
4773 | struct btrfs_block_group_cache *group, | |
4774 | struct btrfs_root *target_root) | |
4775 | { | |
4776 | struct btrfs_key key; | |
4777 | struct inode *inode = NULL; | |
4778 | struct btrfs_file_extent_item *fi; | |
4779 | u64 num_bytes; | |
4780 | u64 skip_objectid = 0; | |
4781 | u32 nritems; | |
4782 | u32 i; | |
4783 | ||
4784 | nritems = btrfs_header_nritems(leaf); | |
4785 | for (i = 0; i < nritems; i++) { | |
4786 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4787 | if (key.objectid == skip_objectid || | |
4788 | key.type != BTRFS_EXTENT_DATA_KEY) | |
4789 | continue; | |
4790 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4791 | if (btrfs_file_extent_type(leaf, fi) == | |
4792 | BTRFS_FILE_EXTENT_INLINE) | |
4793 | continue; | |
4794 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
4795 | continue; | |
4796 | if (!inode || inode->i_ino != key.objectid) { | |
4797 | iput(inode); | |
4798 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
4799 | key.objectid, target_root, 1); | |
4800 | } | |
4801 | if (!inode) { | |
4802 | skip_objectid = key.objectid; | |
4803 | continue; | |
4804 | } | |
4805 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4806 | ||
4807 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, | |
4808 | key.offset + num_bytes - 1, GFP_NOFS); | |
1a40e23b ZY |
4809 | btrfs_drop_extent_cache(inode, key.offset, |
4810 | key.offset + num_bytes - 1, 1); | |
1a40e23b ZY |
4811 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
4812 | key.offset + num_bytes - 1, GFP_NOFS); | |
4813 | cond_resched(); | |
4814 | } | |
4815 | iput(inode); | |
4816 | return 0; | |
4817 | } | |
4818 | ||
d397712b | 4819 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4820 | struct btrfs_root *root, |
4821 | struct extent_buffer *leaf, | |
4822 | struct btrfs_block_group_cache *group, | |
4823 | struct inode *reloc_inode) | |
4824 | { | |
4825 | struct btrfs_key key; | |
4826 | struct btrfs_key extent_key; | |
4827 | struct btrfs_file_extent_item *fi; | |
4828 | struct btrfs_leaf_ref *ref; | |
4829 | struct disk_extent *new_extent; | |
4830 | u64 bytenr; | |
4831 | u64 num_bytes; | |
4832 | u32 nritems; | |
4833 | u32 i; | |
4834 | int ext_index; | |
4835 | int nr_extent; | |
4836 | int ret; | |
4837 | ||
4838 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
4839 | BUG_ON(!new_extent); | |
4840 | ||
4841 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
4842 | BUG_ON(!ref); | |
4843 | ||
4844 | ext_index = -1; | |
4845 | nritems = btrfs_header_nritems(leaf); | |
4846 | for (i = 0; i < nritems; i++) { | |
4847 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4848 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
4849 | continue; | |
4850 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4851 | if (btrfs_file_extent_type(leaf, fi) == | |
4852 | BTRFS_FILE_EXTENT_INLINE) | |
4853 | continue; | |
4854 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
4855 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4856 | if (bytenr == 0) | |
4857 | continue; | |
4858 | ||
4859 | ext_index++; | |
4860 | if (bytenr >= group->key.objectid + group->key.offset || | |
4861 | bytenr + num_bytes <= group->key.objectid) | |
4862 | continue; | |
4863 | ||
4864 | extent_key.objectid = bytenr; | |
4865 | extent_key.offset = num_bytes; | |
4866 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
4867 | nr_extent = 1; | |
4868 | ret = get_new_locations(reloc_inode, &extent_key, | |
4869 | group->key.objectid, 1, | |
4870 | &new_extent, &nr_extent); | |
4871 | if (ret > 0) | |
4872 | continue; | |
4873 | BUG_ON(ret < 0); | |
4874 | ||
4875 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
4876 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
4877 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
4878 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
4879 | ||
1a40e23b ZY |
4880 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4881 | new_extent->disk_bytenr); | |
4882 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4883 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
4884 | btrfs_mark_buffer_dirty(leaf); |
4885 | ||
4886 | ret = btrfs_inc_extent_ref(trans, root, | |
4887 | new_extent->disk_bytenr, | |
4888 | new_extent->disk_num_bytes, | |
4889 | leaf->start, | |
4890 | root->root_key.objectid, | |
3bb1a1bc | 4891 | trans->transid, key.objectid); |
1a40e23b | 4892 | BUG_ON(ret); |
56bec294 | 4893 | |
1a40e23b ZY |
4894 | ret = btrfs_free_extent(trans, root, |
4895 | bytenr, num_bytes, leaf->start, | |
4896 | btrfs_header_owner(leaf), | |
4897 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4898 | key.objectid, 0); |
1a40e23b ZY |
4899 | BUG_ON(ret); |
4900 | cond_resched(); | |
4901 | } | |
4902 | kfree(new_extent); | |
4903 | BUG_ON(ext_index + 1 != ref->nritems); | |
4904 | btrfs_free_leaf_ref(root, ref); | |
4905 | return 0; | |
4906 | } | |
4907 | ||
f82d02d9 YZ |
4908 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
4909 | struct btrfs_root *root) | |
1a40e23b ZY |
4910 | { |
4911 | struct btrfs_root *reloc_root; | |
f82d02d9 | 4912 | int ret; |
1a40e23b ZY |
4913 | |
4914 | if (root->reloc_root) { | |
4915 | reloc_root = root->reloc_root; | |
4916 | root->reloc_root = NULL; | |
4917 | list_add(&reloc_root->dead_list, | |
4918 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
4919 | |
4920 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
4921 | reloc_root->node->start); | |
4922 | btrfs_set_root_level(&root->root_item, | |
4923 | btrfs_header_level(reloc_root->node)); | |
4924 | memset(&reloc_root->root_item.drop_progress, 0, | |
4925 | sizeof(struct btrfs_disk_key)); | |
4926 | reloc_root->root_item.drop_level = 0; | |
4927 | ||
4928 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4929 | &reloc_root->root_key, | |
4930 | &reloc_root->root_item); | |
4931 | BUG_ON(ret); | |
1a40e23b ZY |
4932 | } |
4933 | return 0; | |
4934 | } | |
4935 | ||
4936 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
4937 | { | |
4938 | struct btrfs_trans_handle *trans; | |
4939 | struct btrfs_root *reloc_root; | |
4940 | struct btrfs_root *prev_root = NULL; | |
4941 | struct list_head dead_roots; | |
4942 | int ret; | |
4943 | unsigned long nr; | |
4944 | ||
4945 | INIT_LIST_HEAD(&dead_roots); | |
4946 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
4947 | ||
4948 | while (!list_empty(&dead_roots)) { | |
4949 | reloc_root = list_entry(dead_roots.prev, | |
4950 | struct btrfs_root, dead_list); | |
4951 | list_del_init(&reloc_root->dead_list); | |
4952 | ||
4953 | BUG_ON(reloc_root->commit_root != NULL); | |
4954 | while (1) { | |
4955 | trans = btrfs_join_transaction(root, 1); | |
4956 | BUG_ON(!trans); | |
4957 | ||
4958 | mutex_lock(&root->fs_info->drop_mutex); | |
4959 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
4960 | if (ret != -EAGAIN) | |
4961 | break; | |
4962 | mutex_unlock(&root->fs_info->drop_mutex); | |
4963 | ||
4964 | nr = trans->blocks_used; | |
4965 | ret = btrfs_end_transaction(trans, root); | |
4966 | BUG_ON(ret); | |
4967 | btrfs_btree_balance_dirty(root, nr); | |
4968 | } | |
4969 | ||
4970 | free_extent_buffer(reloc_root->node); | |
4971 | ||
4972 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
4973 | &reloc_root->root_key); | |
4974 | BUG_ON(ret); | |
4975 | mutex_unlock(&root->fs_info->drop_mutex); | |
4976 | ||
4977 | nr = trans->blocks_used; | |
4978 | ret = btrfs_end_transaction(trans, root); | |
4979 | BUG_ON(ret); | |
4980 | btrfs_btree_balance_dirty(root, nr); | |
4981 | ||
4982 | kfree(prev_root); | |
4983 | prev_root = reloc_root; | |
4984 | } | |
4985 | if (prev_root) { | |
4986 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
4987 | kfree(prev_root); | |
4988 | } | |
4989 | return 0; | |
4990 | } | |
4991 | ||
4992 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
4993 | { | |
4994 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
4995 | return 0; | |
4996 | } | |
4997 | ||
4998 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
4999 | { | |
5000 | struct btrfs_root *reloc_root; | |
5001 | struct btrfs_trans_handle *trans; | |
5002 | struct btrfs_key location; | |
5003 | int found; | |
5004 | int ret; | |
5005 | ||
5006 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
5007 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
5008 | BUG_ON(ret); | |
5009 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
5010 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
5011 | ||
5012 | if (found) { | |
5013 | trans = btrfs_start_transaction(root, 1); | |
5014 | BUG_ON(!trans); | |
5015 | ret = btrfs_commit_transaction(trans, root); | |
5016 | BUG_ON(ret); | |
5017 | } | |
5018 | ||
5019 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
5020 | location.offset = (u64)-1; | |
5021 | location.type = BTRFS_ROOT_ITEM_KEY; | |
5022 | ||
5023 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
5024 | BUG_ON(!reloc_root); | |
5025 | btrfs_orphan_cleanup(reloc_root); | |
5026 | return 0; | |
5027 | } | |
5028 | ||
d397712b | 5029 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5030 | struct btrfs_root *root) |
5031 | { | |
5032 | struct btrfs_root *reloc_root; | |
5033 | struct extent_buffer *eb; | |
5034 | struct btrfs_root_item *root_item; | |
5035 | struct btrfs_key root_key; | |
5036 | int ret; | |
5037 | ||
5038 | BUG_ON(!root->ref_cows); | |
5039 | if (root->reloc_root) | |
5040 | return 0; | |
5041 | ||
5042 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
5043 | BUG_ON(!root_item); | |
5044 | ||
5045 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
5046 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
5047 | BUG_ON(ret); | |
5048 | ||
5049 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
5050 | root_key.offset = root->root_key.objectid; | |
5051 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5052 | ||
5053 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
5054 | btrfs_set_root_refs(root_item, 0); | |
5055 | btrfs_set_root_bytenr(root_item, eb->start); | |
5056 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 5057 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
5058 | |
5059 | btrfs_tree_unlock(eb); | |
5060 | free_extent_buffer(eb); | |
5061 | ||
5062 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
5063 | &root_key, root_item); | |
5064 | BUG_ON(ret); | |
5065 | kfree(root_item); | |
5066 | ||
5067 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
5068 | &root_key); | |
5069 | BUG_ON(!reloc_root); | |
5070 | reloc_root->last_trans = trans->transid; | |
5071 | reloc_root->commit_root = NULL; | |
5072 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
5073 | ||
5074 | root->reloc_root = reloc_root; | |
5075 | return 0; | |
5076 | } | |
5077 | ||
5078 | /* | |
5079 | * Core function of space balance. | |
5080 | * | |
5081 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
5082 | * counted roots. There is one reloc tree for each subvol, and all |
5083 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
5084 | * of the latest committed roots of subvols (root->commit_root). | |
5085 | * | |
5086 | * To relocate a tree block referenced by a subvol, there are two steps. | |
5087 | * COW the block through subvol's reloc tree, then update block pointer | |
5088 | * in the subvol to point to the new block. Since all reloc trees share | |
5089 | * same root key objectid, doing special handing for tree blocks owned | |
5090 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
5091 | * we can use the resulting new block directly when the same block is | |
5092 | * required to COW again through other reloc trees. By this way, relocated | |
5093 | * tree blocks are shared between reloc trees, so they are also shared | |
5094 | * between subvols. | |
1a40e23b | 5095 | */ |
d397712b | 5096 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5097 | struct btrfs_root *root, |
5098 | struct btrfs_path *path, | |
5099 | struct btrfs_key *first_key, | |
5100 | struct btrfs_ref_path *ref_path, | |
5101 | struct btrfs_block_group_cache *group, | |
5102 | struct inode *reloc_inode) | |
5103 | { | |
5104 | struct btrfs_root *reloc_root; | |
5105 | struct extent_buffer *eb = NULL; | |
5106 | struct btrfs_key *keys; | |
5107 | u64 *nodes; | |
5108 | int level; | |
f82d02d9 | 5109 | int shared_level; |
1a40e23b | 5110 | int lowest_level = 0; |
1a40e23b ZY |
5111 | int ret; |
5112 | ||
5113 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
5114 | lowest_level = ref_path->owner_objectid; | |
5115 | ||
f82d02d9 | 5116 | if (!root->ref_cows) { |
1a40e23b ZY |
5117 | path->lowest_level = lowest_level; |
5118 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
5119 | BUG_ON(ret < 0); | |
5120 | path->lowest_level = 0; | |
5121 | btrfs_release_path(root, path); | |
5122 | return 0; | |
5123 | } | |
5124 | ||
1a40e23b ZY |
5125 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
5126 | ret = init_reloc_tree(trans, root); | |
5127 | BUG_ON(ret); | |
5128 | reloc_root = root->reloc_root; | |
5129 | ||
f82d02d9 YZ |
5130 | shared_level = ref_path->shared_level; |
5131 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 5132 | |
f82d02d9 YZ |
5133 | keys = ref_path->node_keys; |
5134 | nodes = ref_path->new_nodes; | |
5135 | memset(&keys[shared_level + 1], 0, | |
5136 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
5137 | memset(&nodes[shared_level + 1], 0, | |
5138 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 5139 | |
f82d02d9 YZ |
5140 | if (nodes[lowest_level] == 0) { |
5141 | path->lowest_level = lowest_level; | |
5142 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
5143 | 0, 1); | |
5144 | BUG_ON(ret); | |
5145 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
5146 | eb = path->nodes[level]; | |
5147 | if (!eb || eb == reloc_root->node) | |
5148 | break; | |
5149 | nodes[level] = eb->start; | |
5150 | if (level == 0) | |
5151 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
5152 | else | |
5153 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
5154 | } | |
2b82032c YZ |
5155 | if (nodes[0] && |
5156 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
5157 | eb = path->nodes[0]; |
5158 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
5159 | group, reloc_inode); | |
5160 | BUG_ON(ret); | |
5161 | } | |
5162 | btrfs_release_path(reloc_root, path); | |
5163 | } else { | |
1a40e23b | 5164 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 5165 | lowest_level); |
1a40e23b ZY |
5166 | BUG_ON(ret); |
5167 | } | |
5168 | ||
1a40e23b ZY |
5169 | /* |
5170 | * replace tree blocks in the fs tree with tree blocks in | |
5171 | * the reloc tree. | |
5172 | */ | |
5173 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
5174 | BUG_ON(ret < 0); | |
5175 | ||
5176 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
5177 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
5178 | 0, 0); | |
5179 | BUG_ON(ret); | |
5180 | extent_buffer_get(path->nodes[0]); | |
5181 | eb = path->nodes[0]; | |
5182 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
5183 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
5184 | BUG_ON(ret); | |
5185 | free_extent_buffer(eb); | |
5186 | } | |
1a40e23b | 5187 | |
f82d02d9 | 5188 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 5189 | path->lowest_level = 0; |
1a40e23b ZY |
5190 | return 0; |
5191 | } | |
5192 | ||
d397712b | 5193 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5194 | struct btrfs_root *root, |
5195 | struct btrfs_path *path, | |
5196 | struct btrfs_key *first_key, | |
5197 | struct btrfs_ref_path *ref_path) | |
5198 | { | |
5199 | int ret; | |
1a40e23b ZY |
5200 | |
5201 | ret = relocate_one_path(trans, root, path, first_key, | |
5202 | ref_path, NULL, NULL); | |
5203 | BUG_ON(ret); | |
5204 | ||
1a40e23b ZY |
5205 | return 0; |
5206 | } | |
5207 | ||
d397712b | 5208 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5209 | struct btrfs_root *extent_root, |
5210 | struct btrfs_path *path, | |
5211 | struct btrfs_key *extent_key) | |
5212 | { | |
5213 | int ret; | |
5214 | ||
1a40e23b ZY |
5215 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
5216 | if (ret) | |
5217 | goto out; | |
5218 | ret = btrfs_del_item(trans, extent_root, path); | |
5219 | out: | |
5220 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
5221 | return ret; |
5222 | } | |
5223 | ||
d397712b | 5224 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
5225 | struct btrfs_ref_path *ref_path) |
5226 | { | |
5227 | struct btrfs_key root_key; | |
5228 | ||
5229 | root_key.objectid = ref_path->root_objectid; | |
5230 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5231 | if (is_cowonly_root(ref_path->root_objectid)) | |
5232 | root_key.offset = 0; | |
5233 | else | |
5234 | root_key.offset = (u64)-1; | |
5235 | ||
5236 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5237 | } | |
5238 | ||
d397712b | 5239 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
1a40e23b ZY |
5240 | struct btrfs_path *path, |
5241 | struct btrfs_key *extent_key, | |
5242 | struct btrfs_block_group_cache *group, | |
5243 | struct inode *reloc_inode, int pass) | |
5244 | { | |
5245 | struct btrfs_trans_handle *trans; | |
5246 | struct btrfs_root *found_root; | |
5247 | struct btrfs_ref_path *ref_path = NULL; | |
5248 | struct disk_extent *new_extents = NULL; | |
5249 | int nr_extents = 0; | |
5250 | int loops; | |
5251 | int ret; | |
5252 | int level; | |
5253 | struct btrfs_key first_key; | |
5254 | u64 prev_block = 0; | |
5255 | ||
1a40e23b ZY |
5256 | |
5257 | trans = btrfs_start_transaction(extent_root, 1); | |
5258 | BUG_ON(!trans); | |
5259 | ||
5260 | if (extent_key->objectid == 0) { | |
5261 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
5262 | goto out; | |
5263 | } | |
5264 | ||
5265 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
5266 | if (!ref_path) { | |
d397712b CM |
5267 | ret = -ENOMEM; |
5268 | goto out; | |
1a40e23b ZY |
5269 | } |
5270 | ||
5271 | for (loops = 0; ; loops++) { | |
5272 | if (loops == 0) { | |
5273 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
5274 | extent_key->objectid); | |
5275 | } else { | |
5276 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
5277 | } | |
5278 | if (ret < 0) | |
5279 | goto out; | |
5280 | if (ret > 0) | |
5281 | break; | |
5282 | ||
5283 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
5284 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
5285 | continue; | |
5286 | ||
5287 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
5288 | BUG_ON(!found_root); | |
5289 | /* | |
5290 | * for reference counted tree, only process reference paths | |
5291 | * rooted at the latest committed root. | |
5292 | */ | |
5293 | if (found_root->ref_cows && | |
5294 | ref_path->root_generation != found_root->root_key.offset) | |
5295 | continue; | |
5296 | ||
5297 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
5298 | if (pass == 0) { | |
5299 | /* | |
5300 | * copy data extents to new locations | |
5301 | */ | |
5302 | u64 group_start = group->key.objectid; | |
5303 | ret = relocate_data_extent(reloc_inode, | |
5304 | extent_key, | |
5305 | group_start); | |
5306 | if (ret < 0) | |
5307 | goto out; | |
5308 | break; | |
5309 | } | |
5310 | level = 0; | |
5311 | } else { | |
5312 | level = ref_path->owner_objectid; | |
5313 | } | |
5314 | ||
5315 | if (prev_block != ref_path->nodes[level]) { | |
5316 | struct extent_buffer *eb; | |
5317 | u64 block_start = ref_path->nodes[level]; | |
5318 | u64 block_size = btrfs_level_size(found_root, level); | |
5319 | ||
5320 | eb = read_tree_block(found_root, block_start, | |
5321 | block_size, 0); | |
5322 | btrfs_tree_lock(eb); | |
5323 | BUG_ON(level != btrfs_header_level(eb)); | |
5324 | ||
5325 | if (level == 0) | |
5326 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
5327 | else | |
5328 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
5329 | ||
5330 | btrfs_tree_unlock(eb); | |
5331 | free_extent_buffer(eb); | |
5332 | prev_block = block_start; | |
5333 | } | |
5334 | ||
24562425 | 5335 | mutex_lock(&extent_root->fs_info->trans_mutex); |
e4404d6e | 5336 | btrfs_record_root_in_trans(found_root); |
24562425 | 5337 | mutex_unlock(&extent_root->fs_info->trans_mutex); |
e4404d6e YZ |
5338 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
5339 | /* | |
5340 | * try to update data extent references while | |
5341 | * keeping metadata shared between snapshots. | |
5342 | */ | |
5343 | if (pass == 1) { | |
5344 | ret = relocate_one_path(trans, found_root, | |
5345 | path, &first_key, ref_path, | |
5346 | group, reloc_inode); | |
5347 | if (ret < 0) | |
5348 | goto out; | |
5349 | continue; | |
5350 | } | |
1a40e23b ZY |
5351 | /* |
5352 | * use fallback method to process the remaining | |
5353 | * references. | |
5354 | */ | |
5355 | if (!new_extents) { | |
5356 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
5357 | new_extents = kmalloc(sizeof(*new_extents), |
5358 | GFP_NOFS); | |
5359 | nr_extents = 1; | |
1a40e23b ZY |
5360 | ret = get_new_locations(reloc_inode, |
5361 | extent_key, | |
d899e052 | 5362 | group_start, 1, |
1a40e23b ZY |
5363 | &new_extents, |
5364 | &nr_extents); | |
d899e052 | 5365 | if (ret) |
1a40e23b ZY |
5366 | goto out; |
5367 | } | |
1a40e23b ZY |
5368 | ret = replace_one_extent(trans, found_root, |
5369 | path, extent_key, | |
5370 | &first_key, ref_path, | |
5371 | new_extents, nr_extents); | |
e4404d6e | 5372 | } else { |
1a40e23b ZY |
5373 | ret = relocate_tree_block(trans, found_root, path, |
5374 | &first_key, ref_path); | |
1a40e23b ZY |
5375 | } |
5376 | if (ret < 0) | |
5377 | goto out; | |
5378 | } | |
5379 | ret = 0; | |
5380 | out: | |
5381 | btrfs_end_transaction(trans, extent_root); | |
5382 | kfree(new_extents); | |
5383 | kfree(ref_path); | |
1a40e23b ZY |
5384 | return ret; |
5385 | } | |
5386 | ||
ec44a35c CM |
5387 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
5388 | { | |
5389 | u64 num_devices; | |
5390 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
5391 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
5392 | ||
2b82032c | 5393 | num_devices = root->fs_info->fs_devices->rw_devices; |
ec44a35c CM |
5394 | if (num_devices == 1) { |
5395 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5396 | stripped = flags & ~stripped; | |
5397 | ||
5398 | /* turn raid0 into single device chunks */ | |
5399 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
5400 | return stripped; | |
5401 | ||
5402 | /* turn mirroring into duplication */ | |
5403 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
5404 | BTRFS_BLOCK_GROUP_RAID10)) | |
5405 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
5406 | return flags; | |
5407 | } else { | |
5408 | /* they already had raid on here, just return */ | |
ec44a35c CM |
5409 | if (flags & stripped) |
5410 | return flags; | |
5411 | ||
5412 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5413 | stripped = flags & ~stripped; | |
5414 | ||
5415 | /* switch duplicated blocks with raid1 */ | |
5416 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
5417 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
5418 | ||
5419 | /* turn single device chunks into raid0 */ | |
5420 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
5421 | } | |
5422 | return flags; | |
5423 | } | |
5424 | ||
b2950863 | 5425 | static int __alloc_chunk_for_shrink(struct btrfs_root *root, |
0ef3e66b CM |
5426 | struct btrfs_block_group_cache *shrink_block_group, |
5427 | int force) | |
5428 | { | |
5429 | struct btrfs_trans_handle *trans; | |
5430 | u64 new_alloc_flags; | |
5431 | u64 calc; | |
5432 | ||
c286ac48 | 5433 | spin_lock(&shrink_block_group->lock); |
0ef3e66b | 5434 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
c286ac48 | 5435 | spin_unlock(&shrink_block_group->lock); |
c286ac48 | 5436 | |
0ef3e66b | 5437 | trans = btrfs_start_transaction(root, 1); |
c286ac48 | 5438 | spin_lock(&shrink_block_group->lock); |
7d9eb12c | 5439 | |
0ef3e66b CM |
5440 | new_alloc_flags = update_block_group_flags(root, |
5441 | shrink_block_group->flags); | |
5442 | if (new_alloc_flags != shrink_block_group->flags) { | |
5443 | calc = | |
5444 | btrfs_block_group_used(&shrink_block_group->item); | |
5445 | } else { | |
5446 | calc = shrink_block_group->key.offset; | |
5447 | } | |
c286ac48 CM |
5448 | spin_unlock(&shrink_block_group->lock); |
5449 | ||
0ef3e66b CM |
5450 | do_chunk_alloc(trans, root->fs_info->extent_root, |
5451 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
7d9eb12c | 5452 | |
0ef3e66b | 5453 | btrfs_end_transaction(trans, root); |
c286ac48 CM |
5454 | } else |
5455 | spin_unlock(&shrink_block_group->lock); | |
0ef3e66b CM |
5456 | return 0; |
5457 | } | |
5458 | ||
1a40e23b ZY |
5459 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
5460 | struct btrfs_root *root, | |
5461 | u64 objectid, u64 size) | |
5462 | { | |
5463 | struct btrfs_path *path; | |
5464 | struct btrfs_inode_item *item; | |
5465 | struct extent_buffer *leaf; | |
5466 | int ret; | |
5467 | ||
5468 | path = btrfs_alloc_path(); | |
5469 | if (!path) | |
5470 | return -ENOMEM; | |
5471 | ||
b9473439 | 5472 | path->leave_spinning = 1; |
1a40e23b ZY |
5473 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
5474 | if (ret) | |
5475 | goto out; | |
5476 | ||
5477 | leaf = path->nodes[0]; | |
5478 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); | |
5479 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
5480 | btrfs_set_inode_generation(leaf, item, 1); | |
5481 | btrfs_set_inode_size(leaf, item, size); | |
5482 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); | |
0403e47e | 5483 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS); |
1a40e23b ZY |
5484 | btrfs_mark_buffer_dirty(leaf); |
5485 | btrfs_release_path(root, path); | |
5486 | out: | |
5487 | btrfs_free_path(path); | |
5488 | return ret; | |
5489 | } | |
5490 | ||
d397712b | 5491 | static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
5492 | struct btrfs_block_group_cache *group) |
5493 | { | |
5494 | struct inode *inode = NULL; | |
5495 | struct btrfs_trans_handle *trans; | |
5496 | struct btrfs_root *root; | |
5497 | struct btrfs_key root_key; | |
5498 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; | |
5499 | int err = 0; | |
5500 | ||
5501 | root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
5502 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5503 | root_key.offset = (u64)-1; | |
5504 | root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5505 | if (IS_ERR(root)) | |
5506 | return ERR_CAST(root); | |
5507 | ||
5508 | trans = btrfs_start_transaction(root, 1); | |
5509 | BUG_ON(!trans); | |
5510 | ||
5511 | err = btrfs_find_free_objectid(trans, root, objectid, &objectid); | |
5512 | if (err) | |
5513 | goto out; | |
5514 | ||
5515 | err = __insert_orphan_inode(trans, root, objectid, group->key.offset); | |
5516 | BUG_ON(err); | |
5517 | ||
5518 | err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, | |
c8b97818 CM |
5519 | group->key.offset, 0, group->key.offset, |
5520 | 0, 0, 0); | |
1a40e23b ZY |
5521 | BUG_ON(err); |
5522 | ||
5523 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); | |
5524 | if (inode->i_state & I_NEW) { | |
5525 | BTRFS_I(inode)->root = root; | |
5526 | BTRFS_I(inode)->location.objectid = objectid; | |
5527 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
5528 | BTRFS_I(inode)->location.offset = 0; | |
5529 | btrfs_read_locked_inode(inode); | |
5530 | unlock_new_inode(inode); | |
5531 | BUG_ON(is_bad_inode(inode)); | |
5532 | } else { | |
5533 | BUG_ON(1); | |
5534 | } | |
17d217fe | 5535 | BTRFS_I(inode)->index_cnt = group->key.objectid; |
1a40e23b ZY |
5536 | |
5537 | err = btrfs_orphan_add(trans, inode); | |
5538 | out: | |
5539 | btrfs_end_transaction(trans, root); | |
5540 | if (err) { | |
5541 | if (inode) | |
5542 | iput(inode); | |
5543 | inode = ERR_PTR(err); | |
5544 | } | |
5545 | return inode; | |
5546 | } | |
5547 | ||
17d217fe YZ |
5548 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) |
5549 | { | |
5550 | ||
5551 | struct btrfs_ordered_sum *sums; | |
5552 | struct btrfs_sector_sum *sector_sum; | |
5553 | struct btrfs_ordered_extent *ordered; | |
5554 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5555 | struct list_head list; | |
5556 | size_t offset; | |
5557 | int ret; | |
5558 | u64 disk_bytenr; | |
5559 | ||
5560 | INIT_LIST_HEAD(&list); | |
5561 | ||
5562 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); | |
5563 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); | |
5564 | ||
5565 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; | |
07d400a6 | 5566 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, |
17d217fe YZ |
5567 | disk_bytenr + len - 1, &list); |
5568 | ||
5569 | while (!list_empty(&list)) { | |
5570 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
5571 | list_del_init(&sums->list); | |
5572 | ||
5573 | sector_sum = sums->sums; | |
5574 | sums->bytenr = ordered->start; | |
5575 | ||
5576 | offset = 0; | |
5577 | while (offset < sums->len) { | |
5578 | sector_sum->bytenr += ordered->start - disk_bytenr; | |
5579 | sector_sum++; | |
5580 | offset += root->sectorsize; | |
5581 | } | |
5582 | ||
5583 | btrfs_add_ordered_sum(inode, ordered, sums); | |
5584 | } | |
5585 | btrfs_put_ordered_extent(ordered); | |
5586 | return 0; | |
5587 | } | |
5588 | ||
1a40e23b | 5589 | int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start) |
edbd8d4e CM |
5590 | { |
5591 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 5592 | struct btrfs_path *path; |
1a40e23b ZY |
5593 | struct btrfs_fs_info *info = root->fs_info; |
5594 | struct extent_buffer *leaf; | |
5595 | struct inode *reloc_inode; | |
5596 | struct btrfs_block_group_cache *block_group; | |
5597 | struct btrfs_key key; | |
d899e052 | 5598 | u64 skipped; |
edbd8d4e CM |
5599 | u64 cur_byte; |
5600 | u64 total_found; | |
edbd8d4e CM |
5601 | u32 nritems; |
5602 | int ret; | |
a061fc8d | 5603 | int progress; |
1a40e23b | 5604 | int pass = 0; |
edbd8d4e | 5605 | |
1a40e23b ZY |
5606 | root = root->fs_info->extent_root; |
5607 | ||
5608 | block_group = btrfs_lookup_block_group(info, group_start); | |
5609 | BUG_ON(!block_group); | |
8f18cf13 | 5610 | |
d397712b | 5611 | printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n", |
1a40e23b ZY |
5612 | (unsigned long long)block_group->key.objectid, |
5613 | (unsigned long long)block_group->flags); | |
8f18cf13 | 5614 | |
edbd8d4e | 5615 | path = btrfs_alloc_path(); |
1a40e23b | 5616 | BUG_ON(!path); |
edbd8d4e | 5617 | |
1a40e23b ZY |
5618 | reloc_inode = create_reloc_inode(info, block_group); |
5619 | BUG_ON(IS_ERR(reloc_inode)); | |
323da79c | 5620 | |
1a40e23b | 5621 | __alloc_chunk_for_shrink(root, block_group, 1); |
c146afad | 5622 | set_block_group_readonly(block_group); |
323da79c | 5623 | |
1a40e23b ZY |
5624 | btrfs_start_delalloc_inodes(info->tree_root); |
5625 | btrfs_wait_ordered_extents(info->tree_root, 0); | |
5626 | again: | |
d899e052 | 5627 | skipped = 0; |
edbd8d4e | 5628 | total_found = 0; |
a061fc8d | 5629 | progress = 0; |
1a40e23b | 5630 | key.objectid = block_group->key.objectid; |
edbd8d4e CM |
5631 | key.offset = 0; |
5632 | key.type = 0; | |
73e48b27 | 5633 | cur_byte = key.objectid; |
4313b399 | 5634 | |
1a40e23b ZY |
5635 | trans = btrfs_start_transaction(info->tree_root, 1); |
5636 | btrfs_commit_transaction(trans, info->tree_root); | |
ea8c2819 | 5637 | |
1a40e23b ZY |
5638 | mutex_lock(&root->fs_info->cleaner_mutex); |
5639 | btrfs_clean_old_snapshots(info->tree_root); | |
5640 | btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1); | |
5641 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
ea8c2819 | 5642 | |
56bec294 CM |
5643 | trans = btrfs_start_transaction(info->tree_root, 1); |
5644 | btrfs_commit_transaction(trans, info->tree_root); | |
5645 | ||
d397712b | 5646 | while (1) { |
edbd8d4e CM |
5647 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5648 | if (ret < 0) | |
5649 | goto out; | |
7d9eb12c | 5650 | next: |
edbd8d4e | 5651 | leaf = path->nodes[0]; |
73e48b27 | 5652 | nritems = btrfs_header_nritems(leaf); |
73e48b27 Y |
5653 | if (path->slots[0] >= nritems) { |
5654 | ret = btrfs_next_leaf(root, path); | |
5655 | if (ret < 0) | |
5656 | goto out; | |
5657 | if (ret == 1) { | |
5658 | ret = 0; | |
5659 | break; | |
edbd8d4e | 5660 | } |
73e48b27 Y |
5661 | leaf = path->nodes[0]; |
5662 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 5663 | } |
73e48b27 | 5664 | |
1a40e23b | 5665 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
725c8463 | 5666 | |
1a40e23b ZY |
5667 | if (key.objectid >= block_group->key.objectid + |
5668 | block_group->key.offset) | |
8f18cf13 CM |
5669 | break; |
5670 | ||
725c8463 | 5671 | if (progress && need_resched()) { |
725c8463 | 5672 | btrfs_release_path(root, path); |
1a40e23b | 5673 | cond_resched(); |
725c8463 | 5674 | progress = 0; |
1a40e23b | 5675 | continue; |
725c8463 CM |
5676 | } |
5677 | progress = 1; | |
5678 | ||
1a40e23b ZY |
5679 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY || |
5680 | key.objectid + key.offset <= cur_byte) { | |
edbd8d4e | 5681 | path->slots[0]++; |
edbd8d4e CM |
5682 | goto next; |
5683 | } | |
73e48b27 | 5684 | |
edbd8d4e | 5685 | total_found++; |
1a40e23b | 5686 | cur_byte = key.objectid + key.offset; |
edbd8d4e | 5687 | btrfs_release_path(root, path); |
edbd8d4e | 5688 | |
1a40e23b ZY |
5689 | __alloc_chunk_for_shrink(root, block_group, 0); |
5690 | ret = relocate_one_extent(root, path, &key, block_group, | |
5691 | reloc_inode, pass); | |
5692 | BUG_ON(ret < 0); | |
d899e052 YZ |
5693 | if (ret > 0) |
5694 | skipped++; | |
edbd8d4e | 5695 | |
1a40e23b ZY |
5696 | key.objectid = cur_byte; |
5697 | key.type = 0; | |
5698 | key.offset = 0; | |
edbd8d4e CM |
5699 | } |
5700 | ||
1a40e23b | 5701 | btrfs_release_path(root, path); |
7d9eb12c | 5702 | |
1a40e23b ZY |
5703 | if (pass == 0) { |
5704 | btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1); | |
5705 | invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1); | |
8e8a1e31 | 5706 | } |
73e48b27 | 5707 | |
1a40e23b | 5708 | if (total_found > 0) { |
d397712b | 5709 | printk(KERN_INFO "btrfs found %llu extents in pass %d\n", |
1a40e23b ZY |
5710 | (unsigned long long)total_found, pass); |
5711 | pass++; | |
d899e052 YZ |
5712 | if (total_found == skipped && pass > 2) { |
5713 | iput(reloc_inode); | |
5714 | reloc_inode = create_reloc_inode(info, block_group); | |
5715 | pass = 0; | |
5716 | } | |
1a40e23b | 5717 | goto again; |
0f9dd46c | 5718 | } |
0ef3e66b | 5719 | |
1a40e23b ZY |
5720 | /* delete reloc_inode */ |
5721 | iput(reloc_inode); | |
5722 | ||
5723 | /* unpin extents in this range */ | |
5724 | trans = btrfs_start_transaction(info->tree_root, 1); | |
5725 | btrfs_commit_transaction(trans, info->tree_root); | |
0ef3e66b | 5726 | |
1a40e23b ZY |
5727 | spin_lock(&block_group->lock); |
5728 | WARN_ON(block_group->pinned > 0); | |
5729 | WARN_ON(block_group->reserved > 0); | |
5730 | WARN_ON(btrfs_block_group_used(&block_group->item) > 0); | |
5731 | spin_unlock(&block_group->lock); | |
d2fb3437 | 5732 | put_block_group(block_group); |
1a40e23b | 5733 | ret = 0; |
edbd8d4e | 5734 | out: |
1a40e23b | 5735 | btrfs_free_path(path); |
edbd8d4e CM |
5736 | return ret; |
5737 | } | |
5738 | ||
b2950863 CH |
5739 | static int find_first_block_group(struct btrfs_root *root, |
5740 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 5741 | { |
925baedd | 5742 | int ret = 0; |
0b86a832 CM |
5743 | struct btrfs_key found_key; |
5744 | struct extent_buffer *leaf; | |
5745 | int slot; | |
edbd8d4e | 5746 | |
0b86a832 CM |
5747 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
5748 | if (ret < 0) | |
925baedd CM |
5749 | goto out; |
5750 | ||
d397712b | 5751 | while (1) { |
0b86a832 | 5752 | slot = path->slots[0]; |
edbd8d4e | 5753 | leaf = path->nodes[0]; |
0b86a832 CM |
5754 | if (slot >= btrfs_header_nritems(leaf)) { |
5755 | ret = btrfs_next_leaf(root, path); | |
5756 | if (ret == 0) | |
5757 | continue; | |
5758 | if (ret < 0) | |
925baedd | 5759 | goto out; |
0b86a832 | 5760 | break; |
edbd8d4e | 5761 | } |
0b86a832 | 5762 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 5763 | |
0b86a832 | 5764 | if (found_key.objectid >= key->objectid && |
925baedd CM |
5765 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5766 | ret = 0; | |
5767 | goto out; | |
5768 | } | |
0b86a832 | 5769 | path->slots[0]++; |
edbd8d4e | 5770 | } |
0b86a832 | 5771 | ret = -ENOENT; |
925baedd | 5772 | out: |
0b86a832 | 5773 | return ret; |
edbd8d4e CM |
5774 | } |
5775 | ||
1a40e23b ZY |
5776 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
5777 | { | |
5778 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 5779 | struct btrfs_space_info *space_info; |
1a40e23b ZY |
5780 | struct rb_node *n; |
5781 | ||
1a40e23b ZY |
5782 | spin_lock(&info->block_group_cache_lock); |
5783 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
5784 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
5785 | cache_node); | |
1a40e23b ZY |
5786 | rb_erase(&block_group->cache_node, |
5787 | &info->block_group_cache_tree); | |
d899e052 YZ |
5788 | spin_unlock(&info->block_group_cache_lock); |
5789 | ||
5790 | btrfs_remove_free_space_cache(block_group); | |
80eb234a | 5791 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5792 | list_del(&block_group->list); |
80eb234a | 5793 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 YZ |
5794 | |
5795 | WARN_ON(atomic_read(&block_group->count) != 1); | |
1a40e23b | 5796 | kfree(block_group); |
d899e052 YZ |
5797 | |
5798 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
5799 | } |
5800 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
5801 | |
5802 | /* now that all the block groups are freed, go through and | |
5803 | * free all the space_info structs. This is only called during | |
5804 | * the final stages of unmount, and so we know nobody is | |
5805 | * using them. We call synchronize_rcu() once before we start, | |
5806 | * just to be on the safe side. | |
5807 | */ | |
5808 | synchronize_rcu(); | |
5809 | ||
5810 | while(!list_empty(&info->space_info)) { | |
5811 | space_info = list_entry(info->space_info.next, | |
5812 | struct btrfs_space_info, | |
5813 | list); | |
5814 | ||
5815 | list_del(&space_info->list); | |
5816 | kfree(space_info); | |
5817 | } | |
1a40e23b ZY |
5818 | return 0; |
5819 | } | |
5820 | ||
9078a3e1 CM |
5821 | int btrfs_read_block_groups(struct btrfs_root *root) |
5822 | { | |
5823 | struct btrfs_path *path; | |
5824 | int ret; | |
9078a3e1 | 5825 | struct btrfs_block_group_cache *cache; |
be744175 | 5826 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 5827 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
5828 | struct btrfs_key key; |
5829 | struct btrfs_key found_key; | |
5f39d397 | 5830 | struct extent_buffer *leaf; |
96b5179d | 5831 | |
be744175 | 5832 | root = info->extent_root; |
9078a3e1 | 5833 | key.objectid = 0; |
0b86a832 | 5834 | key.offset = 0; |
9078a3e1 | 5835 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
5836 | path = btrfs_alloc_path(); |
5837 | if (!path) | |
5838 | return -ENOMEM; | |
5839 | ||
d397712b | 5840 | while (1) { |
0b86a832 CM |
5841 | ret = find_first_block_group(root, path, &key); |
5842 | if (ret > 0) { | |
5843 | ret = 0; | |
5844 | goto error; | |
9078a3e1 | 5845 | } |
0b86a832 CM |
5846 | if (ret != 0) |
5847 | goto error; | |
5848 | ||
5f39d397 CM |
5849 | leaf = path->nodes[0]; |
5850 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 5851 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 5852 | if (!cache) { |
0b86a832 | 5853 | ret = -ENOMEM; |
9078a3e1 CM |
5854 | break; |
5855 | } | |
3e1ad54f | 5856 | |
d2fb3437 | 5857 | atomic_set(&cache->count, 1); |
c286ac48 | 5858 | spin_lock_init(&cache->lock); |
25179201 | 5859 | mutex_init(&cache->alloc_mutex); |
ea6a478e | 5860 | mutex_init(&cache->cache_mutex); |
0f9dd46c | 5861 | INIT_LIST_HEAD(&cache->list); |
5f39d397 CM |
5862 | read_extent_buffer(leaf, &cache->item, |
5863 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
5864 | sizeof(cache->item)); | |
9078a3e1 | 5865 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 5866 | |
9078a3e1 CM |
5867 | key.objectid = found_key.objectid + found_key.offset; |
5868 | btrfs_release_path(root, path); | |
0b86a832 | 5869 | cache->flags = btrfs_block_group_flags(&cache->item); |
96b5179d | 5870 | |
6324fbf3 CM |
5871 | ret = update_space_info(info, cache->flags, found_key.offset, |
5872 | btrfs_block_group_used(&cache->item), | |
5873 | &space_info); | |
5874 | BUG_ON(ret); | |
5875 | cache->space_info = space_info; | |
80eb234a JB |
5876 | down_write(&space_info->groups_sem); |
5877 | list_add_tail(&cache->list, &space_info->block_groups); | |
5878 | up_write(&space_info->groups_sem); | |
0f9dd46c JB |
5879 | |
5880 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
5881 | BUG_ON(ret); | |
75ccf47d CM |
5882 | |
5883 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c YZ |
5884 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
5885 | set_block_group_readonly(cache); | |
9078a3e1 | 5886 | } |
0b86a832 CM |
5887 | ret = 0; |
5888 | error: | |
9078a3e1 | 5889 | btrfs_free_path(path); |
0b86a832 | 5890 | return ret; |
9078a3e1 | 5891 | } |
6324fbf3 CM |
5892 | |
5893 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
5894 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 5895 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
5896 | u64 size) |
5897 | { | |
5898 | int ret; | |
6324fbf3 CM |
5899 | struct btrfs_root *extent_root; |
5900 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
5901 | |
5902 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 5903 | |
12fcfd22 | 5904 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 5905 | |
8f18cf13 | 5906 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
5907 | if (!cache) |
5908 | return -ENOMEM; | |
5909 | ||
e17cade2 | 5910 | cache->key.objectid = chunk_offset; |
6324fbf3 | 5911 | cache->key.offset = size; |
d2fb3437 YZ |
5912 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
5913 | atomic_set(&cache->count, 1); | |
c286ac48 | 5914 | spin_lock_init(&cache->lock); |
25179201 | 5915 | mutex_init(&cache->alloc_mutex); |
ea6a478e | 5916 | mutex_init(&cache->cache_mutex); |
0f9dd46c | 5917 | INIT_LIST_HEAD(&cache->list); |
0ef3e66b | 5918 | |
6324fbf3 | 5919 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
5920 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
5921 | cache->flags = type; | |
5922 | btrfs_set_block_group_flags(&cache->item, type); | |
5923 | ||
5924 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
5925 | &cache->space_info); | |
5926 | BUG_ON(ret); | |
80eb234a JB |
5927 | down_write(&cache->space_info->groups_sem); |
5928 | list_add_tail(&cache->list, &cache->space_info->block_groups); | |
5929 | up_write(&cache->space_info->groups_sem); | |
6324fbf3 | 5930 | |
0f9dd46c JB |
5931 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
5932 | BUG_ON(ret); | |
c286ac48 | 5933 | |
6324fbf3 CM |
5934 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
5935 | sizeof(cache->item)); | |
5936 | BUG_ON(ret); | |
5937 | ||
d18a2c44 | 5938 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 5939 | |
6324fbf3 CM |
5940 | return 0; |
5941 | } | |
1a40e23b ZY |
5942 | |
5943 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
5944 | struct btrfs_root *root, u64 group_start) | |
5945 | { | |
5946 | struct btrfs_path *path; | |
5947 | struct btrfs_block_group_cache *block_group; | |
5948 | struct btrfs_key key; | |
5949 | int ret; | |
5950 | ||
1a40e23b ZY |
5951 | root = root->fs_info->extent_root; |
5952 | ||
5953 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
5954 | BUG_ON(!block_group); | |
c146afad | 5955 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
5956 | |
5957 | memcpy(&key, &block_group->key, sizeof(key)); | |
5958 | ||
5959 | path = btrfs_alloc_path(); | |
5960 | BUG_ON(!path); | |
5961 | ||
3dfdb934 | 5962 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
5963 | rb_erase(&block_group->cache_node, |
5964 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 YZ |
5965 | spin_unlock(&root->fs_info->block_group_cache_lock); |
5966 | btrfs_remove_free_space_cache(block_group); | |
80eb234a | 5967 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5968 | list_del(&block_group->list); |
80eb234a | 5969 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 5970 | |
c146afad YZ |
5971 | spin_lock(&block_group->space_info->lock); |
5972 | block_group->space_info->total_bytes -= block_group->key.offset; | |
5973 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
5974 | spin_unlock(&block_group->space_info->lock); | |
2b82032c | 5975 | block_group->space_info->full = 0; |
c146afad | 5976 | |
d2fb3437 YZ |
5977 | put_block_group(block_group); |
5978 | put_block_group(block_group); | |
1a40e23b ZY |
5979 | |
5980 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
5981 | if (ret > 0) | |
5982 | ret = -EIO; | |
5983 | if (ret < 0) | |
5984 | goto out; | |
5985 | ||
5986 | ret = btrfs_del_item(trans, root, path); | |
5987 | out: | |
5988 | btrfs_free_path(path); | |
5989 | return ret; | |
5990 | } |