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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> |
74493f7a | 22 | #include "hash.h" |
a5eb62e3 | 23 | #include "crc32c.h" |
fec577fb CM |
24 | #include "ctree.h" |
25 | #include "disk-io.h" | |
26 | #include "print-tree.h" | |
e089f05c | 27 | #include "transaction.h" |
0b86a832 | 28 | #include "volumes.h" |
925baedd | 29 | #include "locking.h" |
31153d81 | 30 | #include "ref-cache.h" |
fec577fb | 31 | |
31840ae1 ZY |
32 | #define PENDING_EXTENT_INSERT 0 |
33 | #define PENDING_EXTENT_DELETE 1 | |
34 | #define PENDING_BACKREF_UPDATE 2 | |
35 | ||
36 | struct pending_extent_op { | |
37 | int type; | |
38 | u64 bytenr; | |
39 | u64 num_bytes; | |
40 | u64 parent; | |
41 | u64 orig_parent; | |
42 | u64 generation; | |
43 | u64 orig_generation; | |
44 | int level; | |
45 | }; | |
46 | ||
e089f05c CM |
47 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
48 | btrfs_root *extent_root); | |
e20d96d6 CM |
49 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
50 | btrfs_root *extent_root); | |
925baedd CM |
51 | static struct btrfs_block_group_cache * |
52 | __btrfs_find_block_group(struct btrfs_root *root, | |
53 | struct btrfs_block_group_cache *hint, | |
54 | u64 search_start, int data, int owner); | |
d548ee51 | 55 | |
0f9dd46c JB |
56 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
57 | { | |
58 | return (cache->flags & bits) == bits; | |
59 | } | |
60 | ||
61 | /* | |
62 | * this adds the block group to the fs_info rb tree for the block group | |
63 | * cache | |
64 | */ | |
65 | int btrfs_add_block_group_cache(struct btrfs_fs_info *info, | |
66 | struct btrfs_block_group_cache *block_group) | |
67 | { | |
68 | struct rb_node **p; | |
69 | struct rb_node *parent = NULL; | |
70 | struct btrfs_block_group_cache *cache; | |
71 | ||
72 | spin_lock(&info->block_group_cache_lock); | |
73 | p = &info->block_group_cache_tree.rb_node; | |
74 | ||
75 | while (*p) { | |
76 | parent = *p; | |
77 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
78 | cache_node); | |
79 | if (block_group->key.objectid < cache->key.objectid) { | |
80 | p = &(*p)->rb_left; | |
81 | } else if (block_group->key.objectid > cache->key.objectid) { | |
82 | p = &(*p)->rb_right; | |
83 | } else { | |
84 | spin_unlock(&info->block_group_cache_lock); | |
85 | return -EEXIST; | |
86 | } | |
87 | } | |
88 | ||
89 | rb_link_node(&block_group->cache_node, parent, p); | |
90 | rb_insert_color(&block_group->cache_node, | |
91 | &info->block_group_cache_tree); | |
92 | spin_unlock(&info->block_group_cache_lock); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | /* | |
98 | * This will return the block group at or after bytenr if contains is 0, else | |
99 | * it will return the block group that contains the bytenr | |
100 | */ | |
101 | static struct btrfs_block_group_cache * | |
102 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
103 | int contains) | |
104 | { | |
105 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
106 | struct rb_node *n; | |
107 | u64 end, start; | |
108 | ||
109 | spin_lock(&info->block_group_cache_lock); | |
110 | n = info->block_group_cache_tree.rb_node; | |
111 | ||
112 | while (n) { | |
113 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
114 | cache_node); | |
115 | end = cache->key.objectid + cache->key.offset - 1; | |
116 | start = cache->key.objectid; | |
117 | ||
118 | if (bytenr < start) { | |
119 | if (!contains && (!ret || start < ret->key.objectid)) | |
120 | ret = cache; | |
121 | n = n->rb_left; | |
122 | } else if (bytenr > start) { | |
123 | if (contains && bytenr <= end) { | |
124 | ret = cache; | |
125 | break; | |
126 | } | |
127 | n = n->rb_right; | |
128 | } else { | |
129 | ret = cache; | |
130 | break; | |
131 | } | |
132 | } | |
133 | spin_unlock(&info->block_group_cache_lock); | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
139 | * this is only called by cache_block_group, since we could have freed extents | |
140 | * we need to check the pinned_extents for any extents that can't be used yet | |
141 | * since their free space will be released as soon as the transaction commits. | |
142 | */ | |
143 | static int add_new_free_space(struct btrfs_block_group_cache *block_group, | |
144 | struct btrfs_fs_info *info, u64 start, u64 end) | |
145 | { | |
146 | u64 extent_start, extent_end, size; | |
147 | int ret; | |
148 | ||
25179201 | 149 | mutex_lock(&info->pinned_mutex); |
0f9dd46c JB |
150 | while (start < end) { |
151 | ret = find_first_extent_bit(&info->pinned_extents, start, | |
152 | &extent_start, &extent_end, | |
153 | EXTENT_DIRTY); | |
154 | if (ret) | |
155 | break; | |
156 | ||
157 | if (extent_start == start) { | |
158 | start = extent_end + 1; | |
159 | } else if (extent_start > start && extent_start < end) { | |
160 | size = extent_start - start; | |
25179201 JB |
161 | ret = btrfs_add_free_space_lock(block_group, start, |
162 | size); | |
0f9dd46c JB |
163 | BUG_ON(ret); |
164 | start = extent_end + 1; | |
165 | } else { | |
166 | break; | |
167 | } | |
168 | } | |
169 | ||
170 | if (start < end) { | |
171 | size = end - start; | |
25179201 | 172 | ret = btrfs_add_free_space_lock(block_group, start, size); |
0f9dd46c JB |
173 | BUG_ON(ret); |
174 | } | |
25179201 | 175 | mutex_unlock(&info->pinned_mutex); |
0f9dd46c JB |
176 | |
177 | return 0; | |
178 | } | |
179 | ||
e37c9e69 CM |
180 | static int cache_block_group(struct btrfs_root *root, |
181 | struct btrfs_block_group_cache *block_group) | |
182 | { | |
183 | struct btrfs_path *path; | |
ef8bbdfe | 184 | int ret = 0; |
e37c9e69 | 185 | struct btrfs_key key; |
5f39d397 | 186 | struct extent_buffer *leaf; |
e37c9e69 | 187 | int slot; |
e37c9e69 | 188 | u64 last = 0; |
7d7d6068 | 189 | u64 first_free; |
e37c9e69 CM |
190 | int found = 0; |
191 | ||
00f5c795 CM |
192 | if (!block_group) |
193 | return 0; | |
194 | ||
e37c9e69 | 195 | root = root->fs_info->extent_root; |
e37c9e69 CM |
196 | |
197 | if (block_group->cached) | |
198 | return 0; | |
f510cfec | 199 | |
e37c9e69 CM |
200 | path = btrfs_alloc_path(); |
201 | if (!path) | |
202 | return -ENOMEM; | |
7d7d6068 | 203 | |
2cc58cf2 | 204 | path->reada = 2; |
5cd57b2c CM |
205 | /* |
206 | * we get into deadlocks with paths held by callers of this function. | |
207 | * since the alloc_mutex is protecting things right now, just | |
208 | * skip the locking here | |
209 | */ | |
210 | path->skip_locking = 1; | |
0f9dd46c JB |
211 | first_free = max_t(u64, block_group->key.objectid, |
212 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); | |
e37c9e69 | 213 | key.objectid = block_group->key.objectid; |
e37c9e69 CM |
214 | key.offset = 0; |
215 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
216 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
217 | if (ret < 0) | |
ef8bbdfe | 218 | goto err; |
0b86a832 | 219 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
d548ee51 | 220 | if (ret < 0) |
ef8bbdfe | 221 | goto err; |
d548ee51 Y |
222 | if (ret == 0) { |
223 | leaf = path->nodes[0]; | |
224 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
225 | if (key.objectid + key.offset > first_free) | |
226 | first_free = key.objectid + key.offset; | |
227 | } | |
e37c9e69 | 228 | while(1) { |
5f39d397 | 229 | leaf = path->nodes[0]; |
e37c9e69 | 230 | slot = path->slots[0]; |
5f39d397 | 231 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 232 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
233 | if (ret < 0) |
234 | goto err; | |
0f9dd46c | 235 | if (ret == 0) |
e37c9e69 | 236 | continue; |
0f9dd46c | 237 | else |
e37c9e69 | 238 | break; |
e37c9e69 | 239 | } |
5f39d397 | 240 | btrfs_item_key_to_cpu(leaf, &key, slot); |
0f9dd46c | 241 | if (key.objectid < block_group->key.objectid) |
7d7d6068 | 242 | goto next; |
0f9dd46c | 243 | |
e37c9e69 | 244 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 245 | block_group->key.offset) |
e37c9e69 | 246 | break; |
7d7d6068 | 247 | |
e37c9e69 CM |
248 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
249 | if (!found) { | |
7d7d6068 | 250 | last = first_free; |
e37c9e69 | 251 | found = 1; |
e37c9e69 | 252 | } |
0f9dd46c JB |
253 | |
254 | add_new_free_space(block_group, root->fs_info, last, | |
255 | key.objectid); | |
256 | ||
7d7d6068 | 257 | last = key.objectid + key.offset; |
e37c9e69 | 258 | } |
7d7d6068 | 259 | next: |
e37c9e69 CM |
260 | path->slots[0]++; |
261 | } | |
262 | ||
7d7d6068 Y |
263 | if (!found) |
264 | last = first_free; | |
0f9dd46c JB |
265 | |
266 | add_new_free_space(block_group, root->fs_info, last, | |
267 | block_group->key.objectid + | |
268 | block_group->key.offset); | |
269 | ||
e37c9e69 | 270 | block_group->cached = 1; |
ef8bbdfe | 271 | ret = 0; |
54aa1f4d | 272 | err: |
e37c9e69 | 273 | btrfs_free_path(path); |
ef8bbdfe | 274 | return ret; |
e37c9e69 CM |
275 | } |
276 | ||
0f9dd46c JB |
277 | /* |
278 | * return the block group that starts at or after bytenr | |
279 | */ | |
0ef3e66b CM |
280 | struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct |
281 | btrfs_fs_info *info, | |
282 | u64 bytenr) | |
283 | { | |
0f9dd46c | 284 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 285 | |
0f9dd46c | 286 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 287 | |
0f9dd46c | 288 | return cache; |
0ef3e66b CM |
289 | } |
290 | ||
0f9dd46c JB |
291 | /* |
292 | * return the block group that contains teh given bytenr | |
293 | */ | |
5276aeda CM |
294 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
295 | btrfs_fs_info *info, | |
db94535d | 296 | u64 bytenr) |
be744175 | 297 | { |
0f9dd46c | 298 | struct btrfs_block_group_cache *cache; |
be744175 | 299 | |
0f9dd46c | 300 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 301 | |
0f9dd46c | 302 | return cache; |
be744175 | 303 | } |
0b86a832 | 304 | |
0f9dd46c JB |
305 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
306 | u64 flags) | |
6324fbf3 | 307 | { |
0f9dd46c JB |
308 | struct list_head *head = &info->space_info; |
309 | struct list_head *cur; | |
310 | struct btrfs_space_info *found; | |
311 | list_for_each(cur, head) { | |
312 | found = list_entry(cur, struct btrfs_space_info, list); | |
313 | if (found->flags == flags) | |
314 | return found; | |
315 | } | |
316 | return NULL; | |
6324fbf3 CM |
317 | } |
318 | ||
80eb234a JB |
319 | static u64 div_factor(u64 num, int factor) |
320 | { | |
321 | if (factor == 10) | |
322 | return num; | |
323 | num *= factor; | |
324 | do_div(num, 10); | |
325 | return num; | |
326 | } | |
327 | ||
925baedd CM |
328 | static struct btrfs_block_group_cache * |
329 | __btrfs_find_block_group(struct btrfs_root *root, | |
330 | struct btrfs_block_group_cache *hint, | |
331 | u64 search_start, int data, int owner) | |
cd1bc465 | 332 | { |
96b5179d | 333 | struct btrfs_block_group_cache *cache; |
31f3c99b | 334 | struct btrfs_block_group_cache *found_group = NULL; |
cd1bc465 CM |
335 | struct btrfs_fs_info *info = root->fs_info; |
336 | u64 used; | |
31f3c99b | 337 | u64 last = 0; |
96b5179d | 338 | u64 free_check; |
31f3c99b | 339 | int full_search = 0; |
bce4eae9 | 340 | int factor = 10; |
0ef3e66b | 341 | int wrapped = 0; |
de428b63 | 342 | |
a236aed1 CM |
343 | if (data & BTRFS_BLOCK_GROUP_METADATA) |
344 | factor = 9; | |
be744175 | 345 | |
0ef3e66b | 346 | if (search_start) { |
be744175 | 347 | struct btrfs_block_group_cache *shint; |
0ef3e66b | 348 | shint = btrfs_lookup_first_block_group(info, search_start); |
8f18cf13 | 349 | if (shint && block_group_bits(shint, data) && !shint->ro) { |
c286ac48 | 350 | spin_lock(&shint->lock); |
be744175 | 351 | used = btrfs_block_group_used(&shint->item); |
e8569813 | 352 | if (used + shint->pinned + shint->reserved < |
324ae4df | 353 | div_factor(shint->key.offset, factor)) { |
c286ac48 | 354 | spin_unlock(&shint->lock); |
be744175 CM |
355 | return shint; |
356 | } | |
c286ac48 | 357 | spin_unlock(&shint->lock); |
be744175 CM |
358 | } |
359 | } | |
0ef3e66b | 360 | if (hint && !hint->ro && block_group_bits(hint, data)) { |
c286ac48 | 361 | spin_lock(&hint->lock); |
31f3c99b | 362 | used = btrfs_block_group_used(&hint->item); |
e8569813 | 363 | if (used + hint->pinned + hint->reserved < |
324ae4df | 364 | div_factor(hint->key.offset, factor)) { |
c286ac48 | 365 | spin_unlock(&hint->lock); |
31f3c99b CM |
366 | return hint; |
367 | } | |
c286ac48 | 368 | spin_unlock(&hint->lock); |
e19caa5f | 369 | last = hint->key.objectid + hint->key.offset; |
31f3c99b | 370 | } else { |
e37c9e69 | 371 | if (hint) |
0ef3e66b | 372 | last = max(hint->key.objectid, search_start); |
e37c9e69 | 373 | else |
0ef3e66b | 374 | last = search_start; |
31f3c99b | 375 | } |
31f3c99b | 376 | again: |
e8569813 ZY |
377 | while (1) { |
378 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
379 | if (!cache) |
380 | break; | |
96b5179d | 381 | |
c286ac48 | 382 | spin_lock(&cache->lock); |
96b5179d CM |
383 | last = cache->key.objectid + cache->key.offset; |
384 | used = btrfs_block_group_used(&cache->item); | |
385 | ||
8f18cf13 | 386 | if (!cache->ro && block_group_bits(cache, data)) { |
0ef3e66b | 387 | free_check = div_factor(cache->key.offset, factor); |
e8569813 ZY |
388 | if (used + cache->pinned + cache->reserved < |
389 | free_check) { | |
8790d502 | 390 | found_group = cache; |
c286ac48 | 391 | spin_unlock(&cache->lock); |
8790d502 CM |
392 | goto found; |
393 | } | |
6324fbf3 | 394 | } |
c286ac48 | 395 | spin_unlock(&cache->lock); |
de428b63 | 396 | cond_resched(); |
cd1bc465 | 397 | } |
0ef3e66b CM |
398 | if (!wrapped) { |
399 | last = search_start; | |
400 | wrapped = 1; | |
401 | goto again; | |
402 | } | |
403 | if (!full_search && factor < 10) { | |
be744175 | 404 | last = search_start; |
31f3c99b | 405 | full_search = 1; |
0ef3e66b | 406 | factor = 10; |
31f3c99b CM |
407 | goto again; |
408 | } | |
be744175 | 409 | found: |
31f3c99b | 410 | return found_group; |
cd1bc465 CM |
411 | } |
412 | ||
925baedd CM |
413 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
414 | struct btrfs_block_group_cache | |
415 | *hint, u64 search_start, | |
416 | int data, int owner) | |
417 | { | |
418 | ||
419 | struct btrfs_block_group_cache *ret; | |
925baedd | 420 | ret = __btrfs_find_block_group(root, hint, search_start, data, owner); |
925baedd CM |
421 | return ret; |
422 | } | |
0f9dd46c | 423 | |
e02119d5 | 424 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 425 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
426 | { |
427 | int ret; | |
428 | struct btrfs_key key; | |
31840ae1 | 429 | struct btrfs_path *path; |
e02119d5 | 430 | |
31840ae1 ZY |
431 | path = btrfs_alloc_path(); |
432 | BUG_ON(!path); | |
e02119d5 CM |
433 | key.objectid = start; |
434 | key.offset = len; | |
435 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
436 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
437 | 0, 0); | |
31840ae1 | 438 | btrfs_free_path(path); |
7bb86316 CM |
439 | return ret; |
440 | } | |
441 | ||
d8d5f3e1 CM |
442 | /* |
443 | * Back reference rules. Back refs have three main goals: | |
444 | * | |
445 | * 1) differentiate between all holders of references to an extent so that | |
446 | * when a reference is dropped we can make sure it was a valid reference | |
447 | * before freeing the extent. | |
448 | * | |
449 | * 2) Provide enough information to quickly find the holders of an extent | |
450 | * if we notice a given block is corrupted or bad. | |
451 | * | |
452 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
453 | * maintenance. This is actually the same as #2, but with a slightly | |
454 | * different use case. | |
455 | * | |
456 | * File extents can be referenced by: | |
457 | * | |
458 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 459 | * - different files inside a single subvolume |
d8d5f3e1 CM |
460 | * - different offsets inside a file (bookend extents in file.c) |
461 | * | |
462 | * The extent ref structure has fields for: | |
463 | * | |
464 | * - Objectid of the subvolume root | |
465 | * - Generation number of the tree holding the reference | |
466 | * - objectid of the file holding the reference | |
31840ae1 ZY |
467 | * - number of references holding by parent node (alway 1 for tree blocks) |
468 | * | |
469 | * Btree leaf may hold multiple references to a file extent. In most cases, | |
470 | * these references are from same file and the corresponding offsets inside | |
3bb1a1bc | 471 | * the file are close together. |
d8d5f3e1 CM |
472 | * |
473 | * When a file extent is allocated the fields are filled in: | |
3bb1a1bc | 474 | * (root_key.objectid, trans->transid, inode objectid, 1) |
d8d5f3e1 CM |
475 | * |
476 | * When a leaf is cow'd new references are added for every file extent found | |
31840ae1 ZY |
477 | * in the leaf. It looks similar to the create case, but trans->transid will |
478 | * be different when the block is cow'd. | |
d8d5f3e1 | 479 | * |
3bb1a1bc | 480 | * (root_key.objectid, trans->transid, inode objectid, |
31840ae1 | 481 | * number of references in the leaf) |
d8d5f3e1 | 482 | * |
3bb1a1bc YZ |
483 | * When a file extent is removed either during snapshot deletion or |
484 | * file truncation, we find the corresponding back reference and check | |
485 | * the following fields: | |
d8d5f3e1 | 486 | * |
3bb1a1bc YZ |
487 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
488 | * inode objectid) | |
d8d5f3e1 CM |
489 | * |
490 | * Btree extents can be referenced by: | |
491 | * | |
492 | * - Different subvolumes | |
493 | * - Different generations of the same subvolume | |
494 | * | |
d8d5f3e1 CM |
495 | * When a tree block is created, back references are inserted: |
496 | * | |
3bb1a1bc | 497 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 498 | * |
31840ae1 ZY |
499 | * When a tree block is cow'd, new back references are added for all the |
500 | * blocks it points to. If the tree block isn't in reference counted root, | |
501 | * the old back references are removed. These new back references are of | |
502 | * the form (trans->transid will have increased since creation): | |
d8d5f3e1 | 503 | * |
3bb1a1bc | 504 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 505 | * |
31840ae1 | 506 | * When a backref is in deleting, the following fields are checked: |
d8d5f3e1 CM |
507 | * |
508 | * if backref was for a tree root: | |
3bb1a1bc | 509 | * (btrfs_header_owner(itself), btrfs_header_generation(itself), level) |
d8d5f3e1 | 510 | * else |
3bb1a1bc | 511 | * (btrfs_header_owner(parent), btrfs_header_generation(parent), level) |
d8d5f3e1 | 512 | * |
31840ae1 | 513 | * Back Reference Key composing: |
d8d5f3e1 | 514 | * |
31840ae1 ZY |
515 | * The key objectid corresponds to the first byte in the extent, the key |
516 | * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first | |
517 | * byte of parent extent. If a extent is tree root, the key offset is set | |
518 | * to the key objectid. | |
d8d5f3e1 | 519 | */ |
31840ae1 ZY |
520 | |
521 | static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, | |
522 | struct btrfs_root *root, | |
3bb1a1bc YZ |
523 | struct btrfs_path *path, |
524 | u64 bytenr, u64 parent, | |
525 | u64 ref_root, u64 ref_generation, | |
526 | u64 owner_objectid, int del) | |
7bb86316 | 527 | { |
7bb86316 | 528 | struct btrfs_key key; |
31840ae1 ZY |
529 | struct btrfs_extent_ref *ref; |
530 | struct extent_buffer *leaf; | |
3bb1a1bc | 531 | u64 ref_objectid; |
74493f7a CM |
532 | int ret; |
533 | ||
31840ae1 ZY |
534 | key.objectid = bytenr; |
535 | key.type = BTRFS_EXTENT_REF_KEY; | |
536 | key.offset = parent; | |
537 | ||
538 | ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); | |
539 | if (ret < 0) | |
540 | goto out; | |
541 | if (ret > 0) { | |
542 | ret = -ENOENT; | |
543 | goto out; | |
544 | } | |
545 | ||
546 | leaf = path->nodes[0]; | |
547 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
3bb1a1bc | 548 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
31840ae1 | 549 | if (btrfs_ref_root(leaf, ref) != ref_root || |
3bb1a1bc YZ |
550 | btrfs_ref_generation(leaf, ref) != ref_generation || |
551 | (ref_objectid != owner_objectid && | |
552 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { | |
31840ae1 ZY |
553 | ret = -EIO; |
554 | WARN_ON(1); | |
555 | goto out; | |
556 | } | |
557 | ret = 0; | |
558 | out: | |
559 | return ret; | |
560 | } | |
561 | ||
562 | static int noinline insert_extent_backref(struct btrfs_trans_handle *trans, | |
563 | struct btrfs_root *root, | |
564 | struct btrfs_path *path, | |
565 | u64 bytenr, u64 parent, | |
566 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 567 | u64 owner_objectid) |
31840ae1 ZY |
568 | { |
569 | struct btrfs_key key; | |
570 | struct extent_buffer *leaf; | |
571 | struct btrfs_extent_ref *ref; | |
572 | u32 num_refs; | |
573 | int ret; | |
74493f7a | 574 | |
74493f7a CM |
575 | key.objectid = bytenr; |
576 | key.type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 577 | key.offset = parent; |
74493f7a | 578 | |
31840ae1 ZY |
579 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); |
580 | if (ret == 0) { | |
581 | leaf = path->nodes[0]; | |
582 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
583 | struct btrfs_extent_ref); | |
584 | btrfs_set_ref_root(leaf, ref, ref_root); | |
585 | btrfs_set_ref_generation(leaf, ref, ref_generation); | |
586 | btrfs_set_ref_objectid(leaf, ref, owner_objectid); | |
31840ae1 ZY |
587 | btrfs_set_ref_num_refs(leaf, ref, 1); |
588 | } else if (ret == -EEXIST) { | |
589 | u64 existing_owner; | |
590 | BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); | |
591 | leaf = path->nodes[0]; | |
592 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
593 | struct btrfs_extent_ref); | |
594 | if (btrfs_ref_root(leaf, ref) != ref_root || | |
595 | btrfs_ref_generation(leaf, ref) != ref_generation) { | |
596 | ret = -EIO; | |
597 | WARN_ON(1); | |
7bb86316 | 598 | goto out; |
31840ae1 ZY |
599 | } |
600 | ||
601 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
602 | BUG_ON(num_refs == 0); | |
603 | btrfs_set_ref_num_refs(leaf, ref, num_refs + 1); | |
604 | ||
605 | existing_owner = btrfs_ref_objectid(leaf, ref); | |
3bb1a1bc YZ |
606 | if (existing_owner != owner_objectid && |
607 | existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { | |
31840ae1 ZY |
608 | btrfs_set_ref_objectid(leaf, ref, |
609 | BTRFS_MULTIPLE_OBJECTIDS); | |
31840ae1 ZY |
610 | } |
611 | ret = 0; | |
612 | } else { | |
7bb86316 | 613 | goto out; |
31840ae1 | 614 | } |
7bb86316 CM |
615 | btrfs_mark_buffer_dirty(path->nodes[0]); |
616 | out: | |
617 | btrfs_release_path(root, path); | |
618 | return ret; | |
74493f7a CM |
619 | } |
620 | ||
31840ae1 ZY |
621 | static int noinline remove_extent_backref(struct btrfs_trans_handle *trans, |
622 | struct btrfs_root *root, | |
623 | struct btrfs_path *path) | |
624 | { | |
625 | struct extent_buffer *leaf; | |
626 | struct btrfs_extent_ref *ref; | |
627 | u32 num_refs; | |
628 | int ret = 0; | |
629 | ||
630 | leaf = path->nodes[0]; | |
631 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
632 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
633 | BUG_ON(num_refs == 0); | |
634 | num_refs -= 1; | |
635 | if (num_refs == 0) { | |
636 | ret = btrfs_del_item(trans, root, path); | |
637 | } else { | |
638 | btrfs_set_ref_num_refs(leaf, ref, num_refs); | |
639 | btrfs_mark_buffer_dirty(leaf); | |
640 | } | |
641 | btrfs_release_path(root, path); | |
642 | return ret; | |
643 | } | |
644 | ||
645 | static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, | |
646 | struct btrfs_root *root, u64 bytenr, | |
647 | u64 orig_parent, u64 parent, | |
648 | u64 orig_root, u64 ref_root, | |
649 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 650 | u64 owner_objectid) |
31840ae1 ZY |
651 | { |
652 | int ret; | |
653 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
654 | struct btrfs_path *path; | |
655 | ||
656 | if (root == root->fs_info->extent_root) { | |
657 | struct pending_extent_op *extent_op; | |
658 | u64 num_bytes; | |
659 | ||
660 | BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL); | |
661 | num_bytes = btrfs_level_size(root, (int)owner_objectid); | |
25179201 | 662 | mutex_lock(&root->fs_info->extent_ins_mutex); |
31840ae1 | 663 | if (test_range_bit(&root->fs_info->extent_ins, bytenr, |
25179201 | 664 | bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) { |
31840ae1 ZY |
665 | u64 priv; |
666 | ret = get_state_private(&root->fs_info->extent_ins, | |
667 | bytenr, &priv); | |
668 | BUG_ON(ret); | |
669 | extent_op = (struct pending_extent_op *) | |
670 | (unsigned long)priv; | |
671 | BUG_ON(extent_op->parent != orig_parent); | |
672 | BUG_ON(extent_op->generation != orig_generation); | |
25179201 | 673 | |
31840ae1 ZY |
674 | extent_op->parent = parent; |
675 | extent_op->generation = ref_generation; | |
676 | } else { | |
677 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
678 | BUG_ON(!extent_op); | |
679 | ||
680 | extent_op->type = PENDING_BACKREF_UPDATE; | |
681 | extent_op->bytenr = bytenr; | |
682 | extent_op->num_bytes = num_bytes; | |
683 | extent_op->parent = parent; | |
684 | extent_op->orig_parent = orig_parent; | |
685 | extent_op->generation = ref_generation; | |
686 | extent_op->orig_generation = orig_generation; | |
687 | extent_op->level = (int)owner_objectid; | |
688 | ||
689 | set_extent_bits(&root->fs_info->extent_ins, | |
690 | bytenr, bytenr + num_bytes - 1, | |
25179201 | 691 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
692 | set_state_private(&root->fs_info->extent_ins, |
693 | bytenr, (unsigned long)extent_op); | |
694 | } | |
25179201 | 695 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
31840ae1 ZY |
696 | return 0; |
697 | } | |
698 | ||
699 | path = btrfs_alloc_path(); | |
700 | if (!path) | |
701 | return -ENOMEM; | |
702 | ret = lookup_extent_backref(trans, extent_root, path, | |
703 | bytenr, orig_parent, orig_root, | |
3bb1a1bc | 704 | orig_generation, owner_objectid, 1); |
31840ae1 ZY |
705 | if (ret) |
706 | goto out; | |
707 | ret = remove_extent_backref(trans, extent_root, path); | |
708 | if (ret) | |
709 | goto out; | |
710 | ret = insert_extent_backref(trans, extent_root, path, bytenr, | |
711 | parent, ref_root, ref_generation, | |
3bb1a1bc | 712 | owner_objectid); |
31840ae1 ZY |
713 | BUG_ON(ret); |
714 | finish_current_insert(trans, extent_root); | |
715 | del_pending_extents(trans, extent_root); | |
716 | out: | |
717 | btrfs_free_path(path); | |
718 | return ret; | |
719 | } | |
720 | ||
721 | int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, | |
722 | struct btrfs_root *root, u64 bytenr, | |
723 | u64 orig_parent, u64 parent, | |
724 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 725 | u64 owner_objectid) |
31840ae1 ZY |
726 | { |
727 | int ret; | |
728 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && | |
729 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
730 | return 0; | |
31840ae1 ZY |
731 | ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent, |
732 | parent, ref_root, ref_root, | |
733 | ref_generation, ref_generation, | |
3bb1a1bc | 734 | owner_objectid); |
31840ae1 ZY |
735 | return ret; |
736 | } | |
737 | ||
925baedd | 738 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
739 | struct btrfs_root *root, u64 bytenr, |
740 | u64 orig_parent, u64 parent, | |
741 | u64 orig_root, u64 ref_root, | |
742 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 743 | u64 owner_objectid) |
02217ed2 | 744 | { |
5caf2a00 | 745 | struct btrfs_path *path; |
02217ed2 | 746 | int ret; |
e2fa7227 | 747 | struct btrfs_key key; |
5f39d397 | 748 | struct extent_buffer *l; |
234b63a0 | 749 | struct btrfs_extent_item *item; |
cf27e1ee | 750 | u32 refs; |
037e6390 | 751 | |
5caf2a00 | 752 | path = btrfs_alloc_path(); |
54aa1f4d CM |
753 | if (!path) |
754 | return -ENOMEM; | |
26b8003f | 755 | |
3c12ac72 | 756 | path->reada = 1; |
db94535d | 757 | key.objectid = bytenr; |
31840ae1 ZY |
758 | key.type = BTRFS_EXTENT_ITEM_KEY; |
759 | key.offset = (u64)-1; | |
760 | ||
5caf2a00 | 761 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 762 | 0, 1); |
54aa1f4d CM |
763 | if (ret < 0) |
764 | return ret; | |
31840ae1 ZY |
765 | BUG_ON(ret == 0 || path->slots[0] == 0); |
766 | ||
767 | path->slots[0]--; | |
5f39d397 | 768 | l = path->nodes[0]; |
31840ae1 ZY |
769 | |
770 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
771 | BUG_ON(key.objectid != bytenr); | |
772 | BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); | |
773 | ||
5caf2a00 | 774 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 CM |
775 | refs = btrfs_extent_refs(l, item); |
776 | btrfs_set_extent_refs(l, item, refs + 1); | |
5caf2a00 | 777 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 778 | |
5caf2a00 | 779 | btrfs_release_path(root->fs_info->extent_root, path); |
7bb86316 | 780 | |
3c12ac72 | 781 | path->reada = 1; |
31840ae1 ZY |
782 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
783 | path, bytenr, parent, | |
784 | ref_root, ref_generation, | |
3bb1a1bc | 785 | owner_objectid); |
7bb86316 | 786 | BUG_ON(ret); |
9f5fae2f | 787 | finish_current_insert(trans, root->fs_info->extent_root); |
e20d96d6 | 788 | del_pending_extents(trans, root->fs_info->extent_root); |
74493f7a CM |
789 | |
790 | btrfs_free_path(path); | |
02217ed2 CM |
791 | return 0; |
792 | } | |
793 | ||
925baedd | 794 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
795 | struct btrfs_root *root, |
796 | u64 bytenr, u64 num_bytes, u64 parent, | |
797 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 798 | u64 owner_objectid) |
925baedd CM |
799 | { |
800 | int ret; | |
31840ae1 ZY |
801 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && |
802 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
803 | return 0; | |
31840ae1 ZY |
804 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent, |
805 | 0, ref_root, 0, ref_generation, | |
3bb1a1bc | 806 | owner_objectid); |
925baedd CM |
807 | return ret; |
808 | } | |
809 | ||
e9d0b13b CM |
810 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
811 | struct btrfs_root *root) | |
812 | { | |
813 | finish_current_insert(trans, root->fs_info->extent_root); | |
814 | del_pending_extents(trans, root->fs_info->extent_root); | |
815 | return 0; | |
816 | } | |
817 | ||
31840ae1 ZY |
818 | int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans, |
819 | struct btrfs_root *root, u64 bytenr, | |
820 | u64 num_bytes, u32 *refs) | |
a28ec197 | 821 | { |
5caf2a00 | 822 | struct btrfs_path *path; |
a28ec197 | 823 | int ret; |
e2fa7227 | 824 | struct btrfs_key key; |
5f39d397 | 825 | struct extent_buffer *l; |
234b63a0 | 826 | struct btrfs_extent_item *item; |
5caf2a00 | 827 | |
db94535d | 828 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 829 | path = btrfs_alloc_path(); |
3c12ac72 | 830 | path->reada = 1; |
db94535d CM |
831 | key.objectid = bytenr; |
832 | key.offset = num_bytes; | |
62e2749e | 833 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
5caf2a00 | 834 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 835 | 0, 0); |
54aa1f4d CM |
836 | if (ret < 0) |
837 | goto out; | |
5f39d397 CM |
838 | if (ret != 0) { |
839 | btrfs_print_leaf(root, path->nodes[0]); | |
db94535d | 840 | printk("failed to find block number %Lu\n", bytenr); |
a28ec197 | 841 | BUG(); |
5f39d397 CM |
842 | } |
843 | l = path->nodes[0]; | |
5caf2a00 | 844 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 | 845 | *refs = btrfs_extent_refs(l, item); |
54aa1f4d | 846 | out: |
5caf2a00 | 847 | btrfs_free_path(path); |
a28ec197 CM |
848 | return 0; |
849 | } | |
850 | ||
f321e491 YZ |
851 | static int get_reference_status(struct btrfs_root *root, u64 bytenr, |
852 | u64 parent_gen, u64 ref_objectid, | |
853 | u64 *min_generation, u32 *ref_count) | |
be20aa9d CM |
854 | { |
855 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
856 | struct btrfs_path *path; | |
f321e491 YZ |
857 | struct extent_buffer *leaf; |
858 | struct btrfs_extent_ref *ref_item; | |
859 | struct btrfs_key key; | |
860 | struct btrfs_key found_key; | |
56b453c9 | 861 | u64 root_objectid = root->root_key.objectid; |
f321e491 | 862 | u64 ref_generation; |
be20aa9d CM |
863 | u32 nritems; |
864 | int ret; | |
925baedd | 865 | |
be20aa9d | 866 | key.objectid = bytenr; |
31840ae1 | 867 | key.offset = (u64)-1; |
f321e491 | 868 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 869 | |
f321e491 | 870 | path = btrfs_alloc_path(); |
be20aa9d CM |
871 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
872 | if (ret < 0) | |
873 | goto out; | |
874 | BUG_ON(ret == 0); | |
31840ae1 ZY |
875 | if (ret < 0 || path->slots[0] == 0) |
876 | goto out; | |
be20aa9d | 877 | |
31840ae1 | 878 | path->slots[0]--; |
f321e491 YZ |
879 | leaf = path->nodes[0]; |
880 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
be20aa9d CM |
881 | |
882 | if (found_key.objectid != bytenr || | |
883 | found_key.type != BTRFS_EXTENT_ITEM_KEY) { | |
f321e491 | 884 | ret = 1; |
be20aa9d CM |
885 | goto out; |
886 | } | |
887 | ||
f321e491 YZ |
888 | *ref_count = 0; |
889 | *min_generation = (u64)-1; | |
890 | ||
be20aa9d | 891 | while (1) { |
f321e491 YZ |
892 | leaf = path->nodes[0]; |
893 | nritems = btrfs_header_nritems(leaf); | |
be20aa9d CM |
894 | if (path->slots[0] >= nritems) { |
895 | ret = btrfs_next_leaf(extent_root, path); | |
f321e491 YZ |
896 | if (ret < 0) |
897 | goto out; | |
be20aa9d CM |
898 | if (ret == 0) |
899 | continue; | |
900 | break; | |
901 | } | |
f321e491 | 902 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
be20aa9d CM |
903 | if (found_key.objectid != bytenr) |
904 | break; | |
bd09835d | 905 | |
be20aa9d CM |
906 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
907 | path->slots[0]++; | |
908 | continue; | |
909 | } | |
910 | ||
f321e491 | 911 | ref_item = btrfs_item_ptr(leaf, path->slots[0], |
be20aa9d | 912 | struct btrfs_extent_ref); |
f321e491 YZ |
913 | ref_generation = btrfs_ref_generation(leaf, ref_item); |
914 | /* | |
31840ae1 | 915 | * For (parent_gen > 0 && parent_gen > ref_generation): |
f321e491 | 916 | * |
bcc63abb Y |
917 | * we reach here through the oldest root, therefore |
918 | * all other reference from same snapshot should have | |
f321e491 YZ |
919 | * a larger generation. |
920 | */ | |
921 | if ((root_objectid != btrfs_ref_root(leaf, ref_item)) || | |
922 | (parent_gen > 0 && parent_gen > ref_generation) || | |
923 | (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID && | |
924 | ref_objectid != btrfs_ref_objectid(leaf, ref_item))) { | |
31840ae1 | 925 | *ref_count = 2; |
f321e491 | 926 | break; |
a68d5933 | 927 | } |
f321e491 YZ |
928 | |
929 | *ref_count = 1; | |
930 | if (*min_generation > ref_generation) | |
931 | *min_generation = ref_generation; | |
932 | ||
be20aa9d CM |
933 | path->slots[0]++; |
934 | } | |
f321e491 YZ |
935 | ret = 0; |
936 | out: | |
f321e491 YZ |
937 | btrfs_free_path(path); |
938 | return ret; | |
939 | } | |
940 | ||
7ea394f1 YZ |
941 | int btrfs_cross_ref_exists(struct btrfs_trans_handle *trans, |
942 | struct btrfs_root *root, | |
f321e491 YZ |
943 | struct btrfs_key *key, u64 bytenr) |
944 | { | |
f321e491 YZ |
945 | struct btrfs_root *old_root; |
946 | struct btrfs_path *path = NULL; | |
947 | struct extent_buffer *eb; | |
948 | struct btrfs_file_extent_item *item; | |
949 | u64 ref_generation; | |
950 | u64 min_generation; | |
951 | u64 extent_start; | |
952 | u32 ref_count; | |
953 | int level; | |
954 | int ret; | |
955 | ||
7ea394f1 | 956 | BUG_ON(trans == NULL); |
f321e491 YZ |
957 | BUG_ON(key->type != BTRFS_EXTENT_DATA_KEY); |
958 | ret = get_reference_status(root, bytenr, 0, key->objectid, | |
959 | &min_generation, &ref_count); | |
960 | if (ret) | |
961 | return ret; | |
962 | ||
963 | if (ref_count != 1) | |
964 | return 1; | |
965 | ||
f321e491 YZ |
966 | old_root = root->dirty_root->root; |
967 | ref_generation = old_root->root_key.offset; | |
968 | ||
969 | /* all references are created in running transaction */ | |
970 | if (min_generation > ref_generation) { | |
971 | ret = 0; | |
bbaf549e CM |
972 | goto out; |
973 | } | |
f321e491 YZ |
974 | |
975 | path = btrfs_alloc_path(); | |
976 | if (!path) { | |
977 | ret = -ENOMEM; | |
be20aa9d CM |
978 | goto out; |
979 | } | |
f321e491 YZ |
980 | |
981 | path->skip_locking = 1; | |
982 | /* if no item found, the extent is referenced by other snapshot */ | |
983 | ret = btrfs_search_slot(NULL, old_root, key, path, 0, 0); | |
984 | if (ret) | |
be20aa9d | 985 | goto out; |
be20aa9d | 986 | |
f321e491 YZ |
987 | eb = path->nodes[0]; |
988 | item = btrfs_item_ptr(eb, path->slots[0], | |
989 | struct btrfs_file_extent_item); | |
990 | if (btrfs_file_extent_type(eb, item) != BTRFS_FILE_EXTENT_REG || | |
991 | btrfs_file_extent_disk_bytenr(eb, item) != bytenr) { | |
992 | ret = 1; | |
993 | goto out; | |
994 | } | |
995 | ||
996 | for (level = BTRFS_MAX_LEVEL - 1; level >= -1; level--) { | |
997 | if (level >= 0) { | |
998 | eb = path->nodes[level]; | |
999 | if (!eb) | |
1000 | continue; | |
1001 | extent_start = eb->start; | |
bcc63abb | 1002 | } else |
f321e491 YZ |
1003 | extent_start = bytenr; |
1004 | ||
1005 | ret = get_reference_status(root, extent_start, ref_generation, | |
1006 | 0, &min_generation, &ref_count); | |
1007 | if (ret) | |
1008 | goto out; | |
1009 | ||
1010 | if (ref_count != 1) { | |
1011 | ret = 1; | |
1012 | goto out; | |
1013 | } | |
1014 | if (level >= 0) | |
1015 | ref_generation = btrfs_header_generation(eb); | |
1016 | } | |
1017 | ret = 0; | |
be20aa9d | 1018 | out: |
f321e491 YZ |
1019 | if (path) |
1020 | btrfs_free_path(path); | |
f321e491 | 1021 | return ret; |
be20aa9d | 1022 | } |
c5739bba | 1023 | |
31840ae1 ZY |
1024 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
1025 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 1026 | { |
5f39d397 | 1027 | struct btrfs_key key; |
6407bf6d | 1028 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
1029 | u64 root_gen; |
1030 | u32 nritems; | |
02217ed2 | 1031 | int i; |
db94535d | 1032 | int level; |
31840ae1 | 1033 | int ret = 0; |
e4657689 | 1034 | int shared = 0; |
a28ec197 | 1035 | |
3768f368 | 1036 | if (!root->ref_cows) |
a28ec197 | 1037 | return 0; |
5f39d397 | 1038 | |
e4657689 ZY |
1039 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
1040 | shared = 0; | |
1041 | root_gen = root->root_key.offset; | |
1042 | } else { | |
1043 | shared = 1; | |
1044 | root_gen = trans->transid - 1; | |
1045 | } | |
1046 | ||
db94535d | 1047 | level = btrfs_header_level(buf); |
5f39d397 | 1048 | nritems = btrfs_header_nritems(buf); |
4a096752 | 1049 | |
31840ae1 | 1050 | if (level == 0) { |
31153d81 YZ |
1051 | struct btrfs_leaf_ref *ref; |
1052 | struct btrfs_extent_info *info; | |
1053 | ||
31840ae1 | 1054 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 1055 | if (!ref) { |
31840ae1 | 1056 | ret = -ENOMEM; |
31153d81 YZ |
1057 | goto out; |
1058 | } | |
1059 | ||
e4657689 | 1060 | ref->root_gen = root_gen; |
31153d81 YZ |
1061 | ref->bytenr = buf->start; |
1062 | ref->owner = btrfs_header_owner(buf); | |
1063 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 1064 | ref->nritems = nr_extents; |
31153d81 | 1065 | info = ref->extents; |
bcc63abb | 1066 | |
31840ae1 | 1067 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
1068 | u64 disk_bytenr; |
1069 | btrfs_item_key_to_cpu(buf, &key, i); | |
1070 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1071 | continue; | |
1072 | fi = btrfs_item_ptr(buf, i, | |
1073 | struct btrfs_file_extent_item); | |
1074 | if (btrfs_file_extent_type(buf, fi) == | |
1075 | BTRFS_FILE_EXTENT_INLINE) | |
1076 | continue; | |
1077 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1078 | if (disk_bytenr == 0) | |
1079 | continue; | |
1080 | ||
1081 | info->bytenr = disk_bytenr; | |
1082 | info->num_bytes = | |
1083 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
1084 | info->objectid = key.objectid; | |
1085 | info->offset = key.offset; | |
1086 | info++; | |
1087 | } | |
1088 | ||
e4657689 | 1089 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
1090 | if (ret == -EEXIST && shared) { |
1091 | struct btrfs_leaf_ref *old; | |
1092 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
1093 | BUG_ON(!old); | |
1094 | btrfs_remove_leaf_ref(root, old); | |
1095 | btrfs_free_leaf_ref(root, old); | |
1096 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
1097 | } | |
31153d81 | 1098 | WARN_ON(ret); |
bcc63abb | 1099 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
1100 | } |
1101 | out: | |
31840ae1 ZY |
1102 | return ret; |
1103 | } | |
1104 | ||
1105 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
1106 | struct extent_buffer *orig_buf, struct extent_buffer *buf, | |
1107 | u32 *nr_extents) | |
1108 | { | |
1109 | u64 bytenr; | |
1110 | u64 ref_root; | |
1111 | u64 orig_root; | |
1112 | u64 ref_generation; | |
1113 | u64 orig_generation; | |
1114 | u32 nritems; | |
1115 | u32 nr_file_extents = 0; | |
1116 | struct btrfs_key key; | |
1117 | struct btrfs_file_extent_item *fi; | |
1118 | int i; | |
1119 | int level; | |
1120 | int ret = 0; | |
1121 | int faili = 0; | |
1122 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, | |
3bb1a1bc | 1123 | u64, u64, u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
1124 | |
1125 | ref_root = btrfs_header_owner(buf); | |
1126 | ref_generation = btrfs_header_generation(buf); | |
1127 | orig_root = btrfs_header_owner(orig_buf); | |
1128 | orig_generation = btrfs_header_generation(orig_buf); | |
1129 | ||
1130 | nritems = btrfs_header_nritems(buf); | |
1131 | level = btrfs_header_level(buf); | |
1132 | ||
1133 | if (root->ref_cows) { | |
1134 | process_func = __btrfs_inc_extent_ref; | |
1135 | } else { | |
1136 | if (level == 0 && | |
1137 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1138 | goto out; | |
1139 | if (level != 0 && | |
1140 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1141 | goto out; | |
1142 | process_func = __btrfs_update_extent_ref; | |
1143 | } | |
1144 | ||
1145 | for (i = 0; i < nritems; i++) { | |
1146 | cond_resched(); | |
db94535d | 1147 | if (level == 0) { |
5f39d397 CM |
1148 | btrfs_item_key_to_cpu(buf, &key, i); |
1149 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 1150 | continue; |
5f39d397 | 1151 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 1152 | struct btrfs_file_extent_item); |
5f39d397 | 1153 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
1154 | BTRFS_FILE_EXTENT_INLINE) |
1155 | continue; | |
31840ae1 ZY |
1156 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
1157 | if (bytenr == 0) | |
54aa1f4d | 1158 | continue; |
31840ae1 ZY |
1159 | |
1160 | nr_file_extents++; | |
1161 | ||
31840ae1 ZY |
1162 | ret = process_func(trans, root, bytenr, |
1163 | orig_buf->start, buf->start, | |
1164 | orig_root, ref_root, | |
1165 | orig_generation, ref_generation, | |
3bb1a1bc | 1166 | key.objectid); |
31840ae1 ZY |
1167 | |
1168 | if (ret) { | |
1169 | faili = i; | |
1170 | WARN_ON(1); | |
1171 | goto fail; | |
1172 | } | |
54aa1f4d | 1173 | } else { |
db94535d | 1174 | bytenr = btrfs_node_blockptr(buf, i); |
31840ae1 ZY |
1175 | ret = process_func(trans, root, bytenr, |
1176 | orig_buf->start, buf->start, | |
1177 | orig_root, ref_root, | |
1178 | orig_generation, ref_generation, | |
3bb1a1bc | 1179 | level - 1); |
31840ae1 ZY |
1180 | if (ret) { |
1181 | faili = i; | |
1182 | WARN_ON(1); | |
1183 | goto fail; | |
1184 | } | |
54aa1f4d CM |
1185 | } |
1186 | } | |
31840ae1 ZY |
1187 | out: |
1188 | if (nr_extents) { | |
1189 | if (level == 0) | |
1190 | *nr_extents = nr_file_extents; | |
1191 | else | |
1192 | *nr_extents = nritems; | |
1193 | } | |
1194 | return 0; | |
1195 | fail: | |
1196 | WARN_ON(1); | |
54aa1f4d | 1197 | return ret; |
02217ed2 CM |
1198 | } |
1199 | ||
31840ae1 ZY |
1200 | int btrfs_update_ref(struct btrfs_trans_handle *trans, |
1201 | struct btrfs_root *root, struct extent_buffer *orig_buf, | |
1202 | struct extent_buffer *buf, int start_slot, int nr) | |
1203 | ||
1204 | { | |
1205 | u64 bytenr; | |
1206 | u64 ref_root; | |
1207 | u64 orig_root; | |
1208 | u64 ref_generation; | |
1209 | u64 orig_generation; | |
1210 | struct btrfs_key key; | |
1211 | struct btrfs_file_extent_item *fi; | |
1212 | int i; | |
1213 | int ret; | |
1214 | int slot; | |
1215 | int level; | |
1216 | ||
1217 | BUG_ON(start_slot < 0); | |
1218 | BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); | |
1219 | ||
1220 | ref_root = btrfs_header_owner(buf); | |
1221 | ref_generation = btrfs_header_generation(buf); | |
1222 | orig_root = btrfs_header_owner(orig_buf); | |
1223 | orig_generation = btrfs_header_generation(orig_buf); | |
1224 | level = btrfs_header_level(buf); | |
1225 | ||
1226 | if (!root->ref_cows) { | |
1227 | if (level == 0 && | |
1228 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1229 | return 0; | |
1230 | if (level != 0 && | |
1231 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1232 | return 0; | |
1233 | } | |
1234 | ||
1235 | for (i = 0, slot = start_slot; i < nr; i++, slot++) { | |
1236 | cond_resched(); | |
1237 | if (level == 0) { | |
1238 | btrfs_item_key_to_cpu(buf, &key, slot); | |
1239 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1240 | continue; | |
1241 | fi = btrfs_item_ptr(buf, slot, | |
1242 | struct btrfs_file_extent_item); | |
1243 | if (btrfs_file_extent_type(buf, fi) == | |
1244 | BTRFS_FILE_EXTENT_INLINE) | |
1245 | continue; | |
1246 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1247 | if (bytenr == 0) | |
1248 | continue; | |
31840ae1 ZY |
1249 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
1250 | orig_buf->start, buf->start, | |
1251 | orig_root, ref_root, | |
1252 | orig_generation, ref_generation, | |
3bb1a1bc | 1253 | key.objectid); |
31840ae1 ZY |
1254 | if (ret) |
1255 | goto fail; | |
1256 | } else { | |
1257 | bytenr = btrfs_node_blockptr(buf, slot); | |
31840ae1 ZY |
1258 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
1259 | orig_buf->start, buf->start, | |
1260 | orig_root, ref_root, | |
1261 | orig_generation, ref_generation, | |
3bb1a1bc | 1262 | level - 1); |
31840ae1 ZY |
1263 | if (ret) |
1264 | goto fail; | |
1265 | } | |
1266 | } | |
1267 | return 0; | |
1268 | fail: | |
1269 | WARN_ON(1); | |
1270 | return -1; | |
1271 | } | |
1272 | ||
9078a3e1 CM |
1273 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
1274 | struct btrfs_root *root, | |
1275 | struct btrfs_path *path, | |
1276 | struct btrfs_block_group_cache *cache) | |
1277 | { | |
1278 | int ret; | |
1279 | int pending_ret; | |
1280 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
5f39d397 CM |
1281 | unsigned long bi; |
1282 | struct extent_buffer *leaf; | |
9078a3e1 | 1283 | |
9078a3e1 | 1284 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
1285 | if (ret < 0) |
1286 | goto fail; | |
9078a3e1 | 1287 | BUG_ON(ret); |
5f39d397 CM |
1288 | |
1289 | leaf = path->nodes[0]; | |
1290 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1291 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
1292 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 1293 | btrfs_release_path(extent_root, path); |
54aa1f4d | 1294 | fail: |
9078a3e1 CM |
1295 | finish_current_insert(trans, extent_root); |
1296 | pending_ret = del_pending_extents(trans, extent_root); | |
1297 | if (ret) | |
1298 | return ret; | |
1299 | if (pending_ret) | |
1300 | return pending_ret; | |
1301 | return 0; | |
1302 | ||
1303 | } | |
1304 | ||
96b5179d CM |
1305 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
1306 | struct btrfs_root *root) | |
9078a3e1 | 1307 | { |
0f9dd46c JB |
1308 | struct btrfs_block_group_cache *cache, *entry; |
1309 | struct rb_node *n; | |
9078a3e1 CM |
1310 | int err = 0; |
1311 | int werr = 0; | |
9078a3e1 | 1312 | struct btrfs_path *path; |
96b5179d | 1313 | u64 last = 0; |
9078a3e1 CM |
1314 | |
1315 | path = btrfs_alloc_path(); | |
1316 | if (!path) | |
1317 | return -ENOMEM; | |
1318 | ||
1319 | while(1) { | |
0f9dd46c JB |
1320 | cache = NULL; |
1321 | spin_lock(&root->fs_info->block_group_cache_lock); | |
1322 | for (n = rb_first(&root->fs_info->block_group_cache_tree); | |
1323 | n; n = rb_next(n)) { | |
1324 | entry = rb_entry(n, struct btrfs_block_group_cache, | |
1325 | cache_node); | |
1326 | if (entry->dirty) { | |
1327 | cache = entry; | |
1328 | break; | |
1329 | } | |
1330 | } | |
1331 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
54aa1f4d | 1332 | |
0f9dd46c | 1333 | if (!cache) |
96b5179d | 1334 | break; |
0f9dd46c | 1335 | |
e8569813 | 1336 | cache->dirty = 0; |
0f9dd46c JB |
1337 | last += cache->key.offset; |
1338 | ||
96b5179d CM |
1339 | err = write_one_cache_group(trans, root, |
1340 | path, cache); | |
1341 | /* | |
1342 | * if we fail to write the cache group, we want | |
1343 | * to keep it marked dirty in hopes that a later | |
1344 | * write will work | |
1345 | */ | |
1346 | if (err) { | |
1347 | werr = err; | |
1348 | continue; | |
9078a3e1 CM |
1349 | } |
1350 | } | |
1351 | btrfs_free_path(path); | |
1352 | return werr; | |
1353 | } | |
1354 | ||
593060d7 CM |
1355 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1356 | u64 total_bytes, u64 bytes_used, | |
1357 | struct btrfs_space_info **space_info) | |
1358 | { | |
1359 | struct btrfs_space_info *found; | |
1360 | ||
1361 | found = __find_space_info(info, flags); | |
1362 | if (found) { | |
25179201 | 1363 | spin_lock(&found->lock); |
593060d7 CM |
1364 | found->total_bytes += total_bytes; |
1365 | found->bytes_used += bytes_used; | |
8f18cf13 | 1366 | found->full = 0; |
25179201 | 1367 | spin_unlock(&found->lock); |
593060d7 CM |
1368 | *space_info = found; |
1369 | return 0; | |
1370 | } | |
1371 | found = kmalloc(sizeof(*found), GFP_NOFS); | |
1372 | if (!found) | |
1373 | return -ENOMEM; | |
1374 | ||
1375 | list_add(&found->list, &info->space_info); | |
0f9dd46c | 1376 | INIT_LIST_HEAD(&found->block_groups); |
80eb234a | 1377 | init_rwsem(&found->groups_sem); |
0f9dd46c | 1378 | spin_lock_init(&found->lock); |
593060d7 CM |
1379 | found->flags = flags; |
1380 | found->total_bytes = total_bytes; | |
1381 | found->bytes_used = bytes_used; | |
1382 | found->bytes_pinned = 0; | |
e8569813 | 1383 | found->bytes_reserved = 0; |
593060d7 | 1384 | found->full = 0; |
0ef3e66b | 1385 | found->force_alloc = 0; |
593060d7 CM |
1386 | *space_info = found; |
1387 | return 0; | |
1388 | } | |
1389 | ||
8790d502 CM |
1390 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1391 | { | |
1392 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1393 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1394 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1395 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1396 | if (extra_flags) { |
1397 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1398 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1399 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1400 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1401 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1402 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1403 | } | |
1404 | } | |
593060d7 | 1405 | |
a061fc8d | 1406 | static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1407 | { |
a061fc8d CM |
1408 | u64 num_devices = root->fs_info->fs_devices->num_devices; |
1409 | ||
1410 | if (num_devices == 1) | |
1411 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1412 | if (num_devices < 4) | |
1413 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1414 | ||
ec44a35c CM |
1415 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1416 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1417 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1418 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1419 | } |
ec44a35c CM |
1420 | |
1421 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1422 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1423 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1424 | } |
ec44a35c CM |
1425 | |
1426 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1427 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1428 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1429 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1430 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1431 | return flags; | |
1432 | } | |
1433 | ||
6324fbf3 CM |
1434 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1435 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 1436 | u64 flags, int force) |
6324fbf3 CM |
1437 | { |
1438 | struct btrfs_space_info *space_info; | |
1439 | u64 thresh; | |
1440 | u64 start; | |
1441 | u64 num_bytes; | |
cf749823 | 1442 | int ret = 0, waited = 0; |
6324fbf3 | 1443 | |
a061fc8d | 1444 | flags = reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1445 | |
6324fbf3 | 1446 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1447 | if (!space_info) { |
1448 | ret = update_space_info(extent_root->fs_info, flags, | |
1449 | 0, 0, &space_info); | |
1450 | BUG_ON(ret); | |
1451 | } | |
6324fbf3 CM |
1452 | BUG_ON(!space_info); |
1453 | ||
25179201 | 1454 | spin_lock(&space_info->lock); |
0ef3e66b CM |
1455 | if (space_info->force_alloc) { |
1456 | force = 1; | |
1457 | space_info->force_alloc = 0; | |
1458 | } | |
25179201 JB |
1459 | if (space_info->full) { |
1460 | spin_unlock(&space_info->lock); | |
925baedd | 1461 | goto out; |
25179201 | 1462 | } |
6324fbf3 | 1463 | |
8790d502 | 1464 | thresh = div_factor(space_info->total_bytes, 6); |
0ef3e66b | 1465 | if (!force && |
e8569813 | 1466 | (space_info->bytes_used + space_info->bytes_pinned + |
25179201 JB |
1467 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
1468 | spin_unlock(&space_info->lock); | |
925baedd | 1469 | goto out; |
25179201 | 1470 | } |
6324fbf3 | 1471 | |
25179201 JB |
1472 | spin_unlock(&space_info->lock); |
1473 | ||
1474 | ret = mutex_trylock(&extent_root->fs_info->chunk_mutex); | |
1475 | if (!ret && !force) { | |
1476 | goto out; | |
1477 | } else if (!ret) { | |
1478 | mutex_lock(&extent_root->fs_info->chunk_mutex); | |
cf749823 JB |
1479 | waited = 1; |
1480 | } | |
1481 | ||
25179201 JB |
1482 | if (waited) { |
1483 | spin_lock(&space_info->lock); | |
1484 | if (space_info->full) { | |
1485 | spin_unlock(&space_info->lock); | |
1486 | goto out_unlock; | |
1487 | } | |
1488 | spin_unlock(&space_info->lock); | |
1489 | } | |
cf749823 | 1490 | |
6324fbf3 | 1491 | ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags); |
25179201 | 1492 | if (ret) { |
6324fbf3 CM |
1493 | printk("space info full %Lu\n", flags); |
1494 | space_info->full = 1; | |
a74a4b97 | 1495 | goto out_unlock; |
6324fbf3 | 1496 | } |
6324fbf3 CM |
1497 | |
1498 | ret = btrfs_make_block_group(trans, extent_root, 0, flags, | |
e17cade2 | 1499 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes); |
6324fbf3 | 1500 | BUG_ON(ret); |
a74a4b97 | 1501 | out_unlock: |
333db94c | 1502 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
a74a4b97 | 1503 | out: |
0f9dd46c | 1504 | return ret; |
6324fbf3 CM |
1505 | } |
1506 | ||
9078a3e1 CM |
1507 | static int update_block_group(struct btrfs_trans_handle *trans, |
1508 | struct btrfs_root *root, | |
db94535d | 1509 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 1510 | int mark_free) |
9078a3e1 CM |
1511 | { |
1512 | struct btrfs_block_group_cache *cache; | |
1513 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 1514 | u64 total = num_bytes; |
9078a3e1 | 1515 | u64 old_val; |
db94535d | 1516 | u64 byte_in_group; |
3e1ad54f | 1517 | |
9078a3e1 | 1518 | while(total) { |
db94535d | 1519 | cache = btrfs_lookup_block_group(info, bytenr); |
3e1ad54f | 1520 | if (!cache) { |
9078a3e1 | 1521 | return -1; |
cd1bc465 | 1522 | } |
db94535d CM |
1523 | byte_in_group = bytenr - cache->key.objectid; |
1524 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 1525 | |
25179201 | 1526 | spin_lock(&cache->space_info->lock); |
c286ac48 | 1527 | spin_lock(&cache->lock); |
0f9dd46c | 1528 | cache->dirty = 1; |
9078a3e1 | 1529 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 1530 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 1531 | if (alloc) { |
db94535d | 1532 | old_val += num_bytes; |
6324fbf3 | 1533 | cache->space_info->bytes_used += num_bytes; |
c286ac48 CM |
1534 | btrfs_set_block_group_used(&cache->item, old_val); |
1535 | spin_unlock(&cache->lock); | |
25179201 | 1536 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 1537 | } else { |
db94535d | 1538 | old_val -= num_bytes; |
6324fbf3 | 1539 | cache->space_info->bytes_used -= num_bytes; |
c286ac48 CM |
1540 | btrfs_set_block_group_used(&cache->item, old_val); |
1541 | spin_unlock(&cache->lock); | |
25179201 | 1542 | spin_unlock(&cache->space_info->lock); |
f510cfec | 1543 | if (mark_free) { |
0f9dd46c JB |
1544 | int ret; |
1545 | ret = btrfs_add_free_space(cache, bytenr, | |
1546 | num_bytes); | |
1547 | if (ret) | |
1548 | return -1; | |
e37c9e69 | 1549 | } |
cd1bc465 | 1550 | } |
db94535d CM |
1551 | total -= num_bytes; |
1552 | bytenr += num_bytes; | |
9078a3e1 CM |
1553 | } |
1554 | return 0; | |
1555 | } | |
6324fbf3 | 1556 | |
a061fc8d CM |
1557 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
1558 | { | |
0f9dd46c JB |
1559 | struct btrfs_block_group_cache *cache; |
1560 | ||
1561 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
1562 | if (!cache) | |
a061fc8d | 1563 | return 0; |
0f9dd46c JB |
1564 | |
1565 | return cache->key.objectid; | |
a061fc8d CM |
1566 | } |
1567 | ||
e02119d5 | 1568 | int btrfs_update_pinned_extents(struct btrfs_root *root, |
324ae4df Y |
1569 | u64 bytenr, u64 num, int pin) |
1570 | { | |
1571 | u64 len; | |
1572 | struct btrfs_block_group_cache *cache; | |
1573 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1574 | ||
25179201 | 1575 | WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex)); |
324ae4df Y |
1576 | if (pin) { |
1577 | set_extent_dirty(&fs_info->pinned_extents, | |
1578 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1579 | } else { | |
1580 | clear_extent_dirty(&fs_info->pinned_extents, | |
1581 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1582 | } | |
1583 | while (num > 0) { | |
1584 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
e8569813 ZY |
1585 | BUG_ON(!cache); |
1586 | len = min(num, cache->key.offset - | |
1587 | (bytenr - cache->key.objectid)); | |
324ae4df | 1588 | if (pin) { |
25179201 | 1589 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
1590 | spin_lock(&cache->lock); |
1591 | cache->pinned += len; | |
1592 | cache->space_info->bytes_pinned += len; | |
1593 | spin_unlock(&cache->lock); | |
25179201 | 1594 | spin_unlock(&cache->space_info->lock); |
324ae4df Y |
1595 | fs_info->total_pinned += len; |
1596 | } else { | |
25179201 | 1597 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
1598 | spin_lock(&cache->lock); |
1599 | cache->pinned -= len; | |
1600 | cache->space_info->bytes_pinned -= len; | |
1601 | spin_unlock(&cache->lock); | |
25179201 | 1602 | spin_unlock(&cache->space_info->lock); |
324ae4df Y |
1603 | fs_info->total_pinned -= len; |
1604 | } | |
1605 | bytenr += len; | |
1606 | num -= len; | |
1607 | } | |
1608 | return 0; | |
1609 | } | |
9078a3e1 | 1610 | |
e8569813 ZY |
1611 | static int update_reserved_extents(struct btrfs_root *root, |
1612 | u64 bytenr, u64 num, int reserve) | |
1613 | { | |
1614 | u64 len; | |
1615 | struct btrfs_block_group_cache *cache; | |
1616 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1617 | ||
e8569813 ZY |
1618 | while (num > 0) { |
1619 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
1620 | BUG_ON(!cache); | |
1621 | len = min(num, cache->key.offset - | |
1622 | (bytenr - cache->key.objectid)); | |
25179201 JB |
1623 | |
1624 | spin_lock(&cache->space_info->lock); | |
1625 | spin_lock(&cache->lock); | |
e8569813 | 1626 | if (reserve) { |
e8569813 ZY |
1627 | cache->reserved += len; |
1628 | cache->space_info->bytes_reserved += len; | |
e8569813 | 1629 | } else { |
e8569813 ZY |
1630 | cache->reserved -= len; |
1631 | cache->space_info->bytes_reserved -= len; | |
e8569813 | 1632 | } |
25179201 JB |
1633 | spin_unlock(&cache->lock); |
1634 | spin_unlock(&cache->space_info->lock); | |
e8569813 ZY |
1635 | bytenr += len; |
1636 | num -= len; | |
1637 | } | |
1638 | return 0; | |
1639 | } | |
1640 | ||
d1310b2e | 1641 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 1642 | { |
ccd467d6 | 1643 | u64 last = 0; |
1a5bc167 CM |
1644 | u64 start; |
1645 | u64 end; | |
d1310b2e | 1646 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 1647 | int ret; |
ccd467d6 | 1648 | |
25179201 | 1649 | mutex_lock(&root->fs_info->pinned_mutex); |
ccd467d6 | 1650 | while(1) { |
1a5bc167 CM |
1651 | ret = find_first_extent_bit(pinned_extents, last, |
1652 | &start, &end, EXTENT_DIRTY); | |
1653 | if (ret) | |
ccd467d6 | 1654 | break; |
1a5bc167 CM |
1655 | set_extent_dirty(copy, start, end, GFP_NOFS); |
1656 | last = end + 1; | |
ccd467d6 | 1657 | } |
25179201 | 1658 | mutex_unlock(&root->fs_info->pinned_mutex); |
ccd467d6 CM |
1659 | return 0; |
1660 | } | |
1661 | ||
1662 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
1663 | struct btrfs_root *root, | |
d1310b2e | 1664 | struct extent_io_tree *unpin) |
a28ec197 | 1665 | { |
1a5bc167 CM |
1666 | u64 start; |
1667 | u64 end; | |
a28ec197 | 1668 | int ret; |
0f9dd46c | 1669 | struct btrfs_block_group_cache *cache; |
a28ec197 | 1670 | |
25179201 | 1671 | mutex_lock(&root->fs_info->pinned_mutex); |
a28ec197 | 1672 | while(1) { |
1a5bc167 CM |
1673 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
1674 | EXTENT_DIRTY); | |
1675 | if (ret) | |
a28ec197 | 1676 | break; |
e02119d5 | 1677 | btrfs_update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 | 1678 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
0f9dd46c JB |
1679 | cache = btrfs_lookup_block_group(root->fs_info, start); |
1680 | if (cache->cached) | |
1681 | btrfs_add_free_space(cache, start, end - start + 1); | |
c286ac48 | 1682 | if (need_resched()) { |
25179201 | 1683 | mutex_unlock(&root->fs_info->pinned_mutex); |
c286ac48 | 1684 | cond_resched(); |
25179201 | 1685 | mutex_lock(&root->fs_info->pinned_mutex); |
c286ac48 | 1686 | } |
a28ec197 | 1687 | } |
25179201 | 1688 | mutex_unlock(&root->fs_info->pinned_mutex); |
a28ec197 CM |
1689 | return 0; |
1690 | } | |
1691 | ||
98ed5174 CM |
1692 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
1693 | struct btrfs_root *extent_root) | |
037e6390 | 1694 | { |
7bb86316 CM |
1695 | u64 start; |
1696 | u64 end; | |
31840ae1 | 1697 | u64 priv; |
25179201 | 1698 | u64 search = 0; |
7bb86316 CM |
1699 | struct btrfs_fs_info *info = extent_root->fs_info; |
1700 | struct btrfs_path *path; | |
31840ae1 ZY |
1701 | struct btrfs_extent_ref *ref; |
1702 | struct pending_extent_op *extent_op; | |
1703 | struct btrfs_key key; | |
234b63a0 | 1704 | struct btrfs_extent_item extent_item; |
037e6390 | 1705 | int ret; |
1a5bc167 | 1706 | int err = 0; |
037e6390 | 1707 | |
5f39d397 | 1708 | btrfs_set_stack_extent_refs(&extent_item, 1); |
7bb86316 | 1709 | path = btrfs_alloc_path(); |
037e6390 | 1710 | |
26b8003f | 1711 | while(1) { |
25179201 JB |
1712 | mutex_lock(&info->extent_ins_mutex); |
1713 | ret = find_first_extent_bit(&info->extent_ins, search, &start, | |
1714 | &end, EXTENT_WRITEBACK); | |
1715 | if (ret) { | |
1716 | mutex_unlock(&info->extent_ins_mutex); | |
1717 | if (search) { | |
1718 | search = 0; | |
1719 | continue; | |
1720 | } | |
26b8003f | 1721 | break; |
25179201 JB |
1722 | } |
1723 | ||
1724 | ret = try_lock_extent(&info->extent_ins, start, end, GFP_NOFS); | |
1725 | if (!ret) { | |
1726 | search = end+1; | |
1727 | mutex_unlock(&info->extent_ins_mutex); | |
1728 | cond_resched(); | |
1729 | continue; | |
1730 | } | |
1731 | BUG_ON(ret < 0); | |
26b8003f | 1732 | |
31840ae1 ZY |
1733 | ret = get_state_private(&info->extent_ins, start, &priv); |
1734 | BUG_ON(ret); | |
1735 | extent_op = (struct pending_extent_op *)(unsigned long)priv; | |
1736 | ||
25179201 JB |
1737 | mutex_unlock(&info->extent_ins_mutex); |
1738 | ||
31840ae1 ZY |
1739 | if (extent_op->type == PENDING_EXTENT_INSERT) { |
1740 | key.objectid = start; | |
1741 | key.offset = end + 1 - start; | |
1742 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1743 | err = btrfs_insert_item(trans, extent_root, &key, | |
1a5bc167 | 1744 | &extent_item, sizeof(extent_item)); |
31840ae1 | 1745 | BUG_ON(err); |
c286ac48 | 1746 | |
25179201 | 1747 | mutex_lock(&info->extent_ins_mutex); |
31840ae1 | 1748 | clear_extent_bits(&info->extent_ins, start, end, |
25179201 JB |
1749 | EXTENT_WRITEBACK, GFP_NOFS); |
1750 | mutex_unlock(&info->extent_ins_mutex); | |
c286ac48 | 1751 | |
31840ae1 ZY |
1752 | err = insert_extent_backref(trans, extent_root, path, |
1753 | start, extent_op->parent, | |
1754 | extent_root->root_key.objectid, | |
1755 | extent_op->generation, | |
3bb1a1bc | 1756 | extent_op->level); |
31840ae1 ZY |
1757 | BUG_ON(err); |
1758 | } else if (extent_op->type == PENDING_BACKREF_UPDATE) { | |
1759 | err = lookup_extent_backref(trans, extent_root, path, | |
1760 | start, extent_op->orig_parent, | |
1761 | extent_root->root_key.objectid, | |
3bb1a1bc YZ |
1762 | extent_op->orig_generation, |
1763 | extent_op->level, 0); | |
31840ae1 | 1764 | BUG_ON(err); |
c286ac48 | 1765 | |
25179201 | 1766 | mutex_lock(&info->extent_ins_mutex); |
31840ae1 | 1767 | clear_extent_bits(&info->extent_ins, start, end, |
25179201 JB |
1768 | EXTENT_WRITEBACK, GFP_NOFS); |
1769 | mutex_unlock(&info->extent_ins_mutex); | |
31840ae1 ZY |
1770 | |
1771 | key.objectid = start; | |
1772 | key.offset = extent_op->parent; | |
1773 | key.type = BTRFS_EXTENT_REF_KEY; | |
1774 | err = btrfs_set_item_key_safe(trans, extent_root, path, | |
1775 | &key); | |
1776 | BUG_ON(err); | |
1777 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1778 | struct btrfs_extent_ref); | |
1779 | btrfs_set_ref_generation(path->nodes[0], ref, | |
1780 | extent_op->generation); | |
1781 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1782 | btrfs_release_path(extent_root, path); | |
d8d5f3e1 | 1783 | } else { |
31840ae1 | 1784 | BUG_ON(1); |
d8d5f3e1 | 1785 | } |
31840ae1 | 1786 | kfree(extent_op); |
25179201 JB |
1787 | unlock_extent(&info->extent_ins, start, end, GFP_NOFS); |
1788 | search = 0; | |
31840ae1 | 1789 | |
25179201 | 1790 | cond_resched(); |
037e6390 | 1791 | } |
7bb86316 | 1792 | btrfs_free_path(path); |
037e6390 CM |
1793 | return 0; |
1794 | } | |
1795 | ||
31840ae1 ZY |
1796 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
1797 | struct btrfs_root *root, | |
1798 | u64 bytenr, u64 num_bytes, int is_data) | |
e20d96d6 | 1799 | { |
1a5bc167 | 1800 | int err = 0; |
31840ae1 | 1801 | struct extent_buffer *buf; |
8ef97622 | 1802 | |
31840ae1 ZY |
1803 | if (is_data) |
1804 | goto pinit; | |
1805 | ||
1806 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); | |
1807 | if (!buf) | |
1808 | goto pinit; | |
1809 | ||
1810 | /* we can reuse a block if it hasn't been written | |
1811 | * and it is from this transaction. We can't | |
1812 | * reuse anything from the tree log root because | |
1813 | * it has tiny sub-transactions. | |
1814 | */ | |
1815 | if (btrfs_buffer_uptodate(buf, 0) && | |
1816 | btrfs_try_tree_lock(buf)) { | |
1817 | u64 header_owner = btrfs_header_owner(buf); | |
1818 | u64 header_transid = btrfs_header_generation(buf); | |
1819 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && | |
1a40e23b | 1820 | header_owner != BTRFS_TREE_RELOC_OBJECTID && |
31840ae1 ZY |
1821 | header_transid == trans->transid && |
1822 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
1823 | clean_tree_block(NULL, root, buf); | |
1824 | btrfs_tree_unlock(buf); | |
5f39d397 | 1825 | free_extent_buffer(buf); |
31840ae1 | 1826 | return 1; |
8ef97622 | 1827 | } |
31840ae1 | 1828 | btrfs_tree_unlock(buf); |
f4b9aa8d | 1829 | } |
31840ae1 ZY |
1830 | free_extent_buffer(buf); |
1831 | pinit: | |
1832 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); | |
1833 | ||
be744175 | 1834 | BUG_ON(err < 0); |
e20d96d6 CM |
1835 | return 0; |
1836 | } | |
1837 | ||
fec577fb | 1838 | /* |
a28ec197 | 1839 | * remove an extent from the root, returns 0 on success |
fec577fb | 1840 | */ |
31840ae1 ZY |
1841 | static int __free_extent(struct btrfs_trans_handle *trans, |
1842 | struct btrfs_root *root, | |
1843 | u64 bytenr, u64 num_bytes, u64 parent, | |
7bb86316 | 1844 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 1845 | u64 owner_objectid, int pin, int mark_free) |
a28ec197 | 1846 | { |
5caf2a00 | 1847 | struct btrfs_path *path; |
e2fa7227 | 1848 | struct btrfs_key key; |
1261ec42 CM |
1849 | struct btrfs_fs_info *info = root->fs_info; |
1850 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 1851 | struct extent_buffer *leaf; |
a28ec197 | 1852 | int ret; |
952fccac CM |
1853 | int extent_slot = 0; |
1854 | int found_extent = 0; | |
1855 | int num_to_del = 1; | |
234b63a0 | 1856 | struct btrfs_extent_item *ei; |
cf27e1ee | 1857 | u32 refs; |
037e6390 | 1858 | |
db94535d | 1859 | key.objectid = bytenr; |
62e2749e | 1860 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 1861 | key.offset = num_bytes; |
5caf2a00 | 1862 | path = btrfs_alloc_path(); |
54aa1f4d CM |
1863 | if (!path) |
1864 | return -ENOMEM; | |
5f26f772 | 1865 | |
3c12ac72 | 1866 | path->reada = 1; |
3bb1a1bc YZ |
1867 | ret = lookup_extent_backref(trans, extent_root, path, |
1868 | bytenr, parent, root_objectid, | |
1869 | ref_generation, owner_objectid, 1); | |
7bb86316 | 1870 | if (ret == 0) { |
952fccac CM |
1871 | struct btrfs_key found_key; |
1872 | extent_slot = path->slots[0]; | |
1873 | while(extent_slot > 0) { | |
1874 | extent_slot--; | |
1875 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1876 | extent_slot); | |
1877 | if (found_key.objectid != bytenr) | |
1878 | break; | |
1879 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
1880 | found_key.offset == num_bytes) { | |
1881 | found_extent = 1; | |
1882 | break; | |
1883 | } | |
1884 | if (path->slots[0] - extent_slot > 5) | |
1885 | break; | |
1886 | } | |
31840ae1 ZY |
1887 | if (!found_extent) { |
1888 | ret = remove_extent_backref(trans, extent_root, path); | |
1889 | BUG_ON(ret); | |
1890 | btrfs_release_path(extent_root, path); | |
1891 | ret = btrfs_search_slot(trans, extent_root, | |
1892 | &key, path, -1, 1); | |
1893 | BUG_ON(ret); | |
1894 | extent_slot = path->slots[0]; | |
1895 | } | |
7bb86316 CM |
1896 | } else { |
1897 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
1898 | WARN_ON(1); | |
1899 | printk("Unable to find ref byte nr %Lu root %Lu " | |
3bb1a1bc YZ |
1900 | "gen %Lu owner %Lu\n", bytenr, |
1901 | root_objectid, ref_generation, owner_objectid); | |
7bb86316 | 1902 | } |
5f39d397 CM |
1903 | |
1904 | leaf = path->nodes[0]; | |
952fccac | 1905 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 1906 | struct btrfs_extent_item); |
5f39d397 CM |
1907 | refs = btrfs_extent_refs(leaf, ei); |
1908 | BUG_ON(refs == 0); | |
1909 | refs -= 1; | |
1910 | btrfs_set_extent_refs(leaf, ei, refs); | |
952fccac | 1911 | |
5f39d397 CM |
1912 | btrfs_mark_buffer_dirty(leaf); |
1913 | ||
952fccac | 1914 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
31840ae1 ZY |
1915 | struct btrfs_extent_ref *ref; |
1916 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1917 | struct btrfs_extent_ref); | |
1918 | BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1); | |
952fccac CM |
1919 | /* if the back ref and the extent are next to each other |
1920 | * they get deleted below in one shot | |
1921 | */ | |
1922 | path->slots[0] = extent_slot; | |
1923 | num_to_del = 2; | |
1924 | } else if (found_extent) { | |
1925 | /* otherwise delete the extent back ref */ | |
31840ae1 | 1926 | ret = remove_extent_backref(trans, extent_root, path); |
952fccac CM |
1927 | BUG_ON(ret); |
1928 | /* if refs are 0, we need to setup the path for deletion */ | |
1929 | if (refs == 0) { | |
1930 | btrfs_release_path(extent_root, path); | |
1931 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
1932 | -1, 1); | |
952fccac CM |
1933 | BUG_ON(ret); |
1934 | } | |
1935 | } | |
1936 | ||
cf27e1ee | 1937 | if (refs == 0) { |
db94535d CM |
1938 | u64 super_used; |
1939 | u64 root_used; | |
21af804c DW |
1940 | #ifdef BIO_RW_DISCARD |
1941 | u64 map_length = num_bytes; | |
1942 | struct btrfs_multi_bio *multi = NULL; | |
1943 | #endif | |
78fae27e CM |
1944 | |
1945 | if (pin) { | |
25179201 | 1946 | mutex_lock(&root->fs_info->pinned_mutex); |
31840ae1 ZY |
1947 | ret = pin_down_bytes(trans, root, bytenr, num_bytes, |
1948 | owner_objectid >= BTRFS_FIRST_FREE_OBJECTID); | |
25179201 | 1949 | mutex_unlock(&root->fs_info->pinned_mutex); |
c549228f Y |
1950 | if (ret > 0) |
1951 | mark_free = 1; | |
1952 | BUG_ON(ret < 0); | |
78fae27e CM |
1953 | } |
1954 | ||
58176a96 | 1955 | /* block accounting for super block */ |
a2135011 | 1956 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
1957 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1958 | btrfs_set_super_bytes_used(&info->super_copy, | |
1959 | super_used - num_bytes); | |
a2135011 | 1960 | spin_unlock_irq(&info->delalloc_lock); |
58176a96 JB |
1961 | |
1962 | /* block accounting for root item */ | |
db94535d | 1963 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 1964 | btrfs_set_root_used(&root->root_item, |
db94535d | 1965 | root_used - num_bytes); |
952fccac CM |
1966 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
1967 | num_to_del); | |
31840ae1 | 1968 | BUG_ON(ret); |
25179201 | 1969 | btrfs_release_path(extent_root, path); |
db94535d | 1970 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
0b86a832 | 1971 | mark_free); |
9078a3e1 | 1972 | BUG_ON(ret); |
21af804c DW |
1973 | |
1974 | #ifdef BIO_RW_DISCARD | |
1975 | /* Tell the block device(s) that the sectors can be discarded */ | |
1976 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
1977 | bytenr, &map_length, &multi, 0); | |
1978 | if (!ret) { | |
1979 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
1980 | int i; | |
1981 | ||
1982 | if (map_length > num_bytes) | |
1983 | map_length = num_bytes; | |
1984 | ||
1985 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
1986 | blkdev_issue_discard(stripe->dev->bdev, | |
1987 | stripe->physical >> 9, | |
1988 | map_length >> 9); | |
1989 | } | |
1990 | kfree(multi); | |
1991 | } | |
1992 | #endif | |
a28ec197 | 1993 | } |
5caf2a00 | 1994 | btrfs_free_path(path); |
e089f05c | 1995 | finish_current_insert(trans, extent_root); |
a28ec197 CM |
1996 | return ret; |
1997 | } | |
1998 | ||
a28ec197 CM |
1999 | /* |
2000 | * find all the blocks marked as pending in the radix tree and remove | |
2001 | * them from the extent map | |
2002 | */ | |
e089f05c CM |
2003 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
2004 | btrfs_root *extent_root) | |
a28ec197 CM |
2005 | { |
2006 | int ret; | |
e20d96d6 | 2007 | int err = 0; |
1a5bc167 CM |
2008 | u64 start; |
2009 | u64 end; | |
31840ae1 | 2010 | u64 priv; |
25179201 | 2011 | u64 search = 0; |
d1310b2e | 2012 | struct extent_io_tree *pending_del; |
31840ae1 ZY |
2013 | struct extent_io_tree *extent_ins; |
2014 | struct pending_extent_op *extent_op; | |
25179201 | 2015 | struct btrfs_fs_info *info = extent_root->fs_info; |
8ef97622 | 2016 | |
31840ae1 | 2017 | extent_ins = &extent_root->fs_info->extent_ins; |
1a5bc167 | 2018 | pending_del = &extent_root->fs_info->pending_del; |
a28ec197 CM |
2019 | |
2020 | while(1) { | |
25179201 JB |
2021 | mutex_lock(&info->extent_ins_mutex); |
2022 | ret = find_first_extent_bit(pending_del, search, &start, &end, | |
2023 | EXTENT_WRITEBACK); | |
2024 | if (ret) { | |
2025 | mutex_unlock(&info->extent_ins_mutex); | |
2026 | if (search) { | |
2027 | search = 0; | |
2028 | continue; | |
2029 | } | |
a28ec197 | 2030 | break; |
25179201 JB |
2031 | } |
2032 | ||
2033 | ret = try_lock_extent(extent_ins, start, end, GFP_NOFS); | |
2034 | if (!ret) { | |
2035 | search = end+1; | |
2036 | mutex_unlock(&info->extent_ins_mutex); | |
2037 | cond_resched(); | |
2038 | continue; | |
2039 | } | |
2040 | BUG_ON(ret < 0); | |
31840ae1 ZY |
2041 | |
2042 | ret = get_state_private(pending_del, start, &priv); | |
2043 | BUG_ON(ret); | |
2044 | extent_op = (struct pending_extent_op *)(unsigned long)priv; | |
2045 | ||
25179201 | 2046 | clear_extent_bits(pending_del, start, end, EXTENT_WRITEBACK, |
1a5bc167 | 2047 | GFP_NOFS); |
31840ae1 | 2048 | if (!test_range_bit(extent_ins, start, end, |
25179201 JB |
2049 | EXTENT_WRITEBACK, 0)) { |
2050 | mutex_unlock(&info->extent_ins_mutex); | |
31840ae1 | 2051 | free_extent: |
c286ac48 | 2052 | ret = __free_extent(trans, extent_root, |
31840ae1 ZY |
2053 | start, end + 1 - start, |
2054 | extent_op->orig_parent, | |
2055 | extent_root->root_key.objectid, | |
2056 | extent_op->orig_generation, | |
25179201 | 2057 | extent_op->level, 1, 0); |
31840ae1 | 2058 | kfree(extent_op); |
c286ac48 | 2059 | } else { |
31840ae1 | 2060 | kfree(extent_op); |
25179201 JB |
2061 | |
2062 | ret = get_state_private(&info->extent_ins, start, | |
2063 | &priv); | |
31840ae1 ZY |
2064 | BUG_ON(ret); |
2065 | extent_op = (struct pending_extent_op *) | |
25179201 JB |
2066 | (unsigned long)priv; |
2067 | ||
2068 | clear_extent_bits(&info->extent_ins, start, end, | |
2069 | EXTENT_WRITEBACK, GFP_NOFS); | |
31840ae1 | 2070 | |
25179201 | 2071 | mutex_unlock(&info->extent_ins_mutex); |
31840ae1 ZY |
2072 | |
2073 | if (extent_op->type == PENDING_BACKREF_UPDATE) | |
2074 | goto free_extent; | |
2075 | ||
25179201 JB |
2076 | mutex_lock(&extent_root->fs_info->pinned_mutex); |
2077 | ret = pin_down_bytes(trans, extent_root, start, | |
2078 | end + 1 - start, 0); | |
2079 | mutex_unlock(&extent_root->fs_info->pinned_mutex); | |
2080 | ||
31840ae1 | 2081 | ret = update_block_group(trans, extent_root, start, |
25179201 JB |
2082 | end + 1 - start, 0, ret > 0); |
2083 | ||
31840ae1 ZY |
2084 | BUG_ON(ret); |
2085 | kfree(extent_op); | |
c286ac48 | 2086 | } |
1a5bc167 CM |
2087 | if (ret) |
2088 | err = ret; | |
25179201 | 2089 | unlock_extent(extent_ins, start, end, GFP_NOFS); |
c286ac48 | 2090 | |
25179201 JB |
2091 | search = 0; |
2092 | cond_resched(); | |
fec577fb | 2093 | } |
e20d96d6 | 2094 | return err; |
fec577fb CM |
2095 | } |
2096 | ||
2097 | /* | |
2098 | * remove an extent from the root, returns 0 on success | |
2099 | */ | |
925baedd | 2100 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2101 | struct btrfs_root *root, |
2102 | u64 bytenr, u64 num_bytes, u64 parent, | |
2103 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2104 | u64 owner_objectid, int pin) |
fec577fb | 2105 | { |
9f5fae2f | 2106 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
2107 | int pending_ret; |
2108 | int ret; | |
a28ec197 | 2109 | |
db94535d | 2110 | WARN_ON(num_bytes < root->sectorsize); |
fec577fb | 2111 | if (root == extent_root) { |
31840ae1 ZY |
2112 | struct pending_extent_op *extent_op; |
2113 | ||
2114 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2115 | BUG_ON(!extent_op); | |
2116 | ||
2117 | extent_op->type = PENDING_EXTENT_DELETE; | |
2118 | extent_op->bytenr = bytenr; | |
2119 | extent_op->num_bytes = num_bytes; | |
2120 | extent_op->parent = parent; | |
2121 | extent_op->orig_parent = parent; | |
2122 | extent_op->generation = ref_generation; | |
2123 | extent_op->orig_generation = ref_generation; | |
2124 | extent_op->level = (int)owner_objectid; | |
2125 | ||
25179201 | 2126 | mutex_lock(&root->fs_info->extent_ins_mutex); |
31840ae1 ZY |
2127 | set_extent_bits(&root->fs_info->pending_del, |
2128 | bytenr, bytenr + num_bytes - 1, | |
25179201 | 2129 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
2130 | set_state_private(&root->fs_info->pending_del, |
2131 | bytenr, (unsigned long)extent_op); | |
25179201 | 2132 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
fec577fb CM |
2133 | return 0; |
2134 | } | |
4bef0848 | 2135 | /* if metadata always pin */ |
d00aff00 CM |
2136 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
2137 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { | |
0f9dd46c JB |
2138 | struct btrfs_block_group_cache *cache; |
2139 | ||
d00aff00 | 2140 | /* btrfs_free_reserved_extent */ |
0f9dd46c JB |
2141 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
2142 | BUG_ON(!cache); | |
2143 | btrfs_add_free_space(cache, bytenr, num_bytes); | |
e8569813 | 2144 | update_reserved_extents(root, bytenr, num_bytes, 0); |
d00aff00 CM |
2145 | return 0; |
2146 | } | |
4bef0848 | 2147 | pin = 1; |
d00aff00 | 2148 | } |
4bef0848 CM |
2149 | |
2150 | /* if data pin when any transaction has committed this */ | |
2151 | if (ref_generation != trans->transid) | |
2152 | pin = 1; | |
2153 | ||
31840ae1 | 2154 | ret = __free_extent(trans, root, bytenr, num_bytes, parent, |
3bb1a1bc YZ |
2155 | root_objectid, ref_generation, |
2156 | owner_objectid, pin, pin == 0); | |
ee6e6504 CM |
2157 | |
2158 | finish_current_insert(trans, root->fs_info->extent_root); | |
e20d96d6 | 2159 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
fec577fb CM |
2160 | return ret ? ret : pending_ret; |
2161 | } | |
2162 | ||
925baedd | 2163 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2164 | struct btrfs_root *root, |
2165 | u64 bytenr, u64 num_bytes, u64 parent, | |
2166 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2167 | u64 owner_objectid, int pin) |
925baedd CM |
2168 | { |
2169 | int ret; | |
2170 | ||
31840ae1 | 2171 | ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent, |
925baedd | 2172 | root_objectid, ref_generation, |
3bb1a1bc | 2173 | owner_objectid, pin); |
925baedd CM |
2174 | return ret; |
2175 | } | |
2176 | ||
87ee04eb CM |
2177 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
2178 | { | |
2179 | u64 mask = ((u64)root->stripesize - 1); | |
2180 | u64 ret = (val + mask) & ~mask; | |
2181 | return ret; | |
2182 | } | |
2183 | ||
fec577fb CM |
2184 | /* |
2185 | * walks the btree of allocated extents and find a hole of a given size. | |
2186 | * The key ins is changed to record the hole: | |
2187 | * ins->objectid == block start | |
62e2749e | 2188 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
2189 | * ins->offset == number of blocks |
2190 | * Any available blocks before search_start are skipped. | |
2191 | */ | |
98ed5174 CM |
2192 | static int noinline find_free_extent(struct btrfs_trans_handle *trans, |
2193 | struct btrfs_root *orig_root, | |
2194 | u64 num_bytes, u64 empty_size, | |
2195 | u64 search_start, u64 search_end, | |
2196 | u64 hint_byte, struct btrfs_key *ins, | |
2197 | u64 exclude_start, u64 exclude_nr, | |
2198 | int data) | |
fec577fb | 2199 | { |
80eb234a | 2200 | int ret = 0; |
9f5fae2f | 2201 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
db94535d | 2202 | u64 total_needed = num_bytes; |
239b14b3 | 2203 | u64 *last_ptr = NULL; |
80eb234a | 2204 | struct btrfs_block_group_cache *block_group = NULL; |
0ef3e66b | 2205 | int chunk_alloc_done = 0; |
239b14b3 | 2206 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 2207 | int allowed_chunk_alloc = 0; |
80eb234a JB |
2208 | struct list_head *head = NULL, *cur = NULL; |
2209 | int loop = 0; | |
2210 | struct btrfs_space_info *space_info; | |
fec577fb | 2211 | |
db94535d | 2212 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 2213 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
2214 | ins->objectid = 0; |
2215 | ins->offset = 0; | |
b1a4d965 | 2216 | |
0ef3e66b CM |
2217 | if (orig_root->ref_cows || empty_size) |
2218 | allowed_chunk_alloc = 1; | |
2219 | ||
239b14b3 CM |
2220 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
2221 | last_ptr = &root->fs_info->last_alloc; | |
8790d502 | 2222 | empty_cluster = 256 * 1024; |
239b14b3 CM |
2223 | } |
2224 | ||
0f9dd46c | 2225 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) |
239b14b3 | 2226 | last_ptr = &root->fs_info->last_data_alloc; |
0f9dd46c | 2227 | |
239b14b3 CM |
2228 | if (last_ptr) { |
2229 | if (*last_ptr) | |
2230 | hint_byte = *last_ptr; | |
0f9dd46c | 2231 | else |
239b14b3 | 2232 | empty_size += empty_cluster; |
239b14b3 | 2233 | } |
a061fc8d | 2234 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 2235 | search_start = max(search_start, hint_byte); |
6702ed49 | 2236 | total_needed += empty_size; |
0b86a832 | 2237 | |
80eb234a JB |
2238 | block_group = btrfs_lookup_block_group(root->fs_info, search_start); |
2239 | space_info = __find_space_info(root->fs_info, data); | |
0f9dd46c | 2240 | |
80eb234a JB |
2241 | down_read(&space_info->groups_sem); |
2242 | while (1) { | |
2243 | struct btrfs_free_space *free_space; | |
0f9dd46c | 2244 | /* |
80eb234a JB |
2245 | * the only way this happens if our hint points to a block |
2246 | * group thats not of the proper type, while looping this | |
2247 | * should never happen | |
0f9dd46c | 2248 | */ |
25179201 JB |
2249 | WARN_ON(!block_group); |
2250 | mutex_lock(&block_group->alloc_mutex); | |
80eb234a | 2251 | if (unlikely(!block_group_bits(block_group, data))) |
0f9dd46c | 2252 | goto new_group; |
0f9dd46c | 2253 | |
80eb234a | 2254 | ret = cache_block_group(root, block_group); |
25179201 JB |
2255 | if (ret) { |
2256 | mutex_unlock(&block_group->alloc_mutex); | |
80eb234a | 2257 | break; |
25179201 | 2258 | } |
0f9dd46c | 2259 | |
80eb234a JB |
2260 | if (block_group->ro) |
2261 | goto new_group; | |
0f9dd46c | 2262 | |
80eb234a JB |
2263 | free_space = btrfs_find_free_space(block_group, search_start, |
2264 | total_needed); | |
2265 | if (free_space) { | |
2266 | u64 start = block_group->key.objectid; | |
2267 | u64 end = block_group->key.objectid + | |
0f9dd46c | 2268 | block_group->key.offset; |
239b14b3 | 2269 | |
80eb234a | 2270 | search_start = stripe_align(root, free_space->offset); |
0f9dd46c | 2271 | |
80eb234a JB |
2272 | /* move on to the next group */ |
2273 | if (search_start + num_bytes >= search_end) | |
2274 | goto new_group; | |
e37c9e69 | 2275 | |
80eb234a JB |
2276 | /* move on to the next group */ |
2277 | if (search_start + num_bytes > end) | |
2278 | goto new_group; | |
2279 | ||
2280 | if (exclude_nr > 0 && | |
2281 | (search_start + num_bytes > exclude_start && | |
2282 | search_start < exclude_start + exclude_nr)) { | |
2283 | search_start = exclude_start + exclude_nr; | |
2284 | /* | |
2285 | * if search_start is still in this block group | |
2286 | * then we just re-search this block group | |
2287 | */ | |
2288 | if (search_start >= start && | |
25179201 JB |
2289 | search_start < end) { |
2290 | mutex_unlock(&block_group->alloc_mutex); | |
80eb234a | 2291 | continue; |
25179201 | 2292 | } |
80eb234a JB |
2293 | |
2294 | /* else we go to the next block group */ | |
2295 | goto new_group; | |
2296 | } | |
2297 | ||
2298 | ins->objectid = search_start; | |
2299 | ins->offset = num_bytes; | |
25179201 JB |
2300 | |
2301 | btrfs_remove_free_space_lock(block_group, search_start, | |
2302 | num_bytes); | |
80eb234a | 2303 | /* we are all good, lets return */ |
25179201 | 2304 | mutex_unlock(&block_group->alloc_mutex); |
80eb234a | 2305 | break; |
0f9dd46c | 2306 | } |
80eb234a | 2307 | new_group: |
25179201 | 2308 | mutex_unlock(&block_group->alloc_mutex); |
80eb234a JB |
2309 | /* |
2310 | * Here's how this works. | |
2311 | * loop == 0: we were searching a block group via a hint | |
2312 | * and didn't find anything, so we start at | |
2313 | * the head of the block groups and keep searching | |
2314 | * loop == 1: we're searching through all of the block groups | |
2315 | * if we hit the head again we have searched | |
2316 | * all of the block groups for this space and we | |
2317 | * need to try and allocate, if we cant error out. | |
2318 | * loop == 2: we allocated more space and are looping through | |
2319 | * all of the block groups again. | |
2320 | */ | |
2321 | if (loop == 0) { | |
2322 | head = &space_info->block_groups; | |
2323 | cur = head->next; | |
0b86a832 | 2324 | |
80eb234a JB |
2325 | if (last_ptr && *last_ptr) { |
2326 | total_needed += empty_cluster; | |
2327 | *last_ptr = 0; | |
2328 | } | |
2329 | loop++; | |
2330 | } else if (loop == 1 && cur == head) { | |
2331 | if (allowed_chunk_alloc && !chunk_alloc_done) { | |
2332 | up_read(&space_info->groups_sem); | |
2333 | ret = do_chunk_alloc(trans, root, num_bytes + | |
2334 | 2 * 1024 * 1024, data, 1); | |
2335 | if (ret < 0) | |
2336 | break; | |
2337 | down_read(&space_info->groups_sem); | |
2338 | loop++; | |
2339 | head = &space_info->block_groups; | |
2340 | cur = head->next; | |
2341 | chunk_alloc_done = 1; | |
2342 | } else if (!allowed_chunk_alloc) { | |
2343 | space_info->force_alloc = 1; | |
2344 | break; | |
2345 | } else { | |
2346 | break; | |
2347 | } | |
2348 | } else if (cur == head) { | |
2349 | break; | |
0f9dd46c | 2350 | } |
0b86a832 | 2351 | |
80eb234a JB |
2352 | block_group = list_entry(cur, struct btrfs_block_group_cache, |
2353 | list); | |
2354 | search_start = block_group->key.objectid; | |
2355 | cur = cur->next; | |
f2654de4 | 2356 | } |
0b86a832 | 2357 | |
80eb234a JB |
2358 | /* we found what we needed */ |
2359 | if (ins->objectid) { | |
2360 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
2361 | trans->block_group = block_group; | |
0f9dd46c | 2362 | |
80eb234a JB |
2363 | if (last_ptr) |
2364 | *last_ptr = ins->objectid + ins->offset; | |
2365 | ret = 0; | |
2366 | } else if (!ret) { | |
2367 | ret = -ENOSPC; | |
be744175 | 2368 | } |
be744175 | 2369 | |
80eb234a | 2370 | up_read(&space_info->groups_sem); |
0f70abe2 | 2371 | return ret; |
fec577fb | 2372 | } |
ec44a35c | 2373 | |
0f9dd46c JB |
2374 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes) |
2375 | { | |
2376 | struct btrfs_block_group_cache *cache; | |
2377 | struct list_head *l; | |
2378 | ||
2379 | printk(KERN_INFO "space_info has %Lu free, is %sfull\n", | |
e8569813 ZY |
2380 | info->total_bytes - info->bytes_used - info->bytes_pinned - |
2381 | info->bytes_reserved, (info->full) ? "" : "not "); | |
0f9dd46c | 2382 | |
80eb234a | 2383 | down_read(&info->groups_sem); |
0f9dd46c JB |
2384 | list_for_each(l, &info->block_groups) { |
2385 | cache = list_entry(l, struct btrfs_block_group_cache, list); | |
2386 | spin_lock(&cache->lock); | |
2387 | printk(KERN_INFO "block group %Lu has %Lu bytes, %Lu used " | |
e8569813 | 2388 | "%Lu pinned %Lu reserved\n", |
0f9dd46c | 2389 | cache->key.objectid, cache->key.offset, |
e8569813 ZY |
2390 | btrfs_block_group_used(&cache->item), |
2391 | cache->pinned, cache->reserved); | |
0f9dd46c JB |
2392 | btrfs_dump_free_space(cache, bytes); |
2393 | spin_unlock(&cache->lock); | |
2394 | } | |
80eb234a | 2395 | up_read(&info->groups_sem); |
0f9dd46c | 2396 | } |
e8569813 | 2397 | |
e6dcd2dc CM |
2398 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
2399 | struct btrfs_root *root, | |
2400 | u64 num_bytes, u64 min_alloc_size, | |
2401 | u64 empty_size, u64 hint_byte, | |
2402 | u64 search_end, struct btrfs_key *ins, | |
2403 | u64 data) | |
fec577fb CM |
2404 | { |
2405 | int ret; | |
fbdc762b | 2406 | u64 search_start = 0; |
8790d502 | 2407 | u64 alloc_profile; |
1261ec42 | 2408 | struct btrfs_fs_info *info = root->fs_info; |
925baedd | 2409 | |
6324fbf3 | 2410 | if (data) { |
8790d502 CM |
2411 | alloc_profile = info->avail_data_alloc_bits & |
2412 | info->data_alloc_profile; | |
2413 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
6324fbf3 | 2414 | } else if (root == root->fs_info->chunk_root) { |
8790d502 CM |
2415 | alloc_profile = info->avail_system_alloc_bits & |
2416 | info->system_alloc_profile; | |
2417 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
6324fbf3 | 2418 | } else { |
8790d502 CM |
2419 | alloc_profile = info->avail_metadata_alloc_bits & |
2420 | info->metadata_alloc_profile; | |
2421 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
6324fbf3 | 2422 | } |
98d20f67 | 2423 | again: |
a061fc8d | 2424 | data = reduce_alloc_profile(root, data); |
0ef3e66b CM |
2425 | /* |
2426 | * the only place that sets empty_size is btrfs_realloc_node, which | |
2427 | * is not called recursively on allocations | |
2428 | */ | |
2429 | if (empty_size || root->ref_cows) { | |
593060d7 | 2430 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 2431 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
2432 | 2 * 1024 * 1024, |
2433 | BTRFS_BLOCK_GROUP_METADATA | | |
2434 | (info->metadata_alloc_profile & | |
2435 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
2436 | } |
2437 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 2438 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 | 2439 | } |
0b86a832 | 2440 | |
db94535d CM |
2441 | WARN_ON(num_bytes < root->sectorsize); |
2442 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
2443 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
2444 | trans->alloc_exclude_start, |
2445 | trans->alloc_exclude_nr, data); | |
3b951516 | 2446 | |
98d20f67 CM |
2447 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
2448 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 2449 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 2450 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
2451 | do_chunk_alloc(trans, root->fs_info->extent_root, |
2452 | num_bytes, data, 1); | |
98d20f67 CM |
2453 | goto again; |
2454 | } | |
ec44a35c | 2455 | if (ret) { |
0f9dd46c JB |
2456 | struct btrfs_space_info *sinfo; |
2457 | ||
2458 | sinfo = __find_space_info(root->fs_info, data); | |
2459 | printk("allocation failed flags %Lu, wanted %Lu\n", | |
2460 | data, num_bytes); | |
2461 | dump_space_info(sinfo, num_bytes); | |
925baedd | 2462 | BUG(); |
925baedd | 2463 | } |
0f9dd46c JB |
2464 | |
2465 | return ret; | |
e6dcd2dc CM |
2466 | } |
2467 | ||
65b51a00 CM |
2468 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
2469 | { | |
0f9dd46c JB |
2470 | struct btrfs_block_group_cache *cache; |
2471 | ||
0f9dd46c JB |
2472 | cache = btrfs_lookup_block_group(root->fs_info, start); |
2473 | if (!cache) { | |
2474 | printk(KERN_ERR "Unable to find block group for %Lu\n", start); | |
0f9dd46c JB |
2475 | return -ENOSPC; |
2476 | } | |
2477 | btrfs_add_free_space(cache, start, len); | |
1a40e23b | 2478 | update_reserved_extents(root, start, len, 0); |
65b51a00 CM |
2479 | return 0; |
2480 | } | |
2481 | ||
e6dcd2dc CM |
2482 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
2483 | struct btrfs_root *root, | |
2484 | u64 num_bytes, u64 min_alloc_size, | |
2485 | u64 empty_size, u64 hint_byte, | |
2486 | u64 search_end, struct btrfs_key *ins, | |
2487 | u64 data) | |
2488 | { | |
2489 | int ret; | |
e6dcd2dc CM |
2490 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, |
2491 | empty_size, hint_byte, search_end, ins, | |
2492 | data); | |
e8569813 | 2493 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
e6dcd2dc CM |
2494 | return ret; |
2495 | } | |
2496 | ||
2497 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 2498 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 2499 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2500 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
2501 | { |
2502 | int ret; | |
2503 | int pending_ret; | |
2504 | u64 super_used; | |
2505 | u64 root_used; | |
2506 | u64 num_bytes = ins->offset; | |
2507 | u32 sizes[2]; | |
2508 | struct btrfs_fs_info *info = root->fs_info; | |
2509 | struct btrfs_root *extent_root = info->extent_root; | |
2510 | struct btrfs_extent_item *extent_item; | |
2511 | struct btrfs_extent_ref *ref; | |
2512 | struct btrfs_path *path; | |
2513 | struct btrfs_key keys[2]; | |
fec577fb | 2514 | |
31840ae1 ZY |
2515 | if (parent == 0) |
2516 | parent = ins->objectid; | |
2517 | ||
58176a96 | 2518 | /* block accounting for super block */ |
a2135011 | 2519 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
2520 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2521 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
a2135011 | 2522 | spin_unlock_irq(&info->delalloc_lock); |
26b8003f | 2523 | |
58176a96 | 2524 | /* block accounting for root item */ |
db94535d CM |
2525 | root_used = btrfs_root_used(&root->root_item); |
2526 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
58176a96 | 2527 | |
26b8003f | 2528 | if (root == extent_root) { |
31840ae1 ZY |
2529 | struct pending_extent_op *extent_op; |
2530 | ||
2531 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2532 | BUG_ON(!extent_op); | |
2533 | ||
2534 | extent_op->type = PENDING_EXTENT_INSERT; | |
2535 | extent_op->bytenr = ins->objectid; | |
2536 | extent_op->num_bytes = ins->offset; | |
2537 | extent_op->parent = parent; | |
2538 | extent_op->orig_parent = 0; | |
2539 | extent_op->generation = ref_generation; | |
2540 | extent_op->orig_generation = 0; | |
2541 | extent_op->level = (int)owner; | |
2542 | ||
25179201 | 2543 | mutex_lock(&root->fs_info->extent_ins_mutex); |
1a5bc167 CM |
2544 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
2545 | ins->objectid + ins->offset - 1, | |
25179201 | 2546 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
2547 | set_state_private(&root->fs_info->extent_ins, |
2548 | ins->objectid, (unsigned long)extent_op); | |
25179201 | 2549 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
26b8003f CM |
2550 | goto update_block; |
2551 | } | |
2552 | ||
47e4bb98 | 2553 | memcpy(&keys[0], ins, sizeof(*ins)); |
47e4bb98 CM |
2554 | keys[1].objectid = ins->objectid; |
2555 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 2556 | keys[1].offset = parent; |
47e4bb98 CM |
2557 | sizes[0] = sizeof(*extent_item); |
2558 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
2559 | |
2560 | path = btrfs_alloc_path(); | |
2561 | BUG_ON(!path); | |
47e4bb98 CM |
2562 | |
2563 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, | |
2564 | sizes, 2); | |
ccd467d6 | 2565 | BUG_ON(ret); |
0f9dd46c | 2566 | |
47e4bb98 CM |
2567 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2568 | struct btrfs_extent_item); | |
2569 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); | |
2570 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
2571 | struct btrfs_extent_ref); | |
2572 | ||
2573 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
2574 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
2575 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
31840ae1 | 2576 | btrfs_set_ref_num_refs(path->nodes[0], ref, 1); |
47e4bb98 CM |
2577 | |
2578 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2579 | ||
2580 | trans->alloc_exclude_start = 0; | |
2581 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 2582 | btrfs_free_path(path); |
e089f05c | 2583 | finish_current_insert(trans, extent_root); |
e20d96d6 | 2584 | pending_ret = del_pending_extents(trans, extent_root); |
f510cfec | 2585 | |
925baedd CM |
2586 | if (ret) |
2587 | goto out; | |
e37c9e69 | 2588 | if (pending_ret) { |
925baedd CM |
2589 | ret = pending_ret; |
2590 | goto out; | |
e37c9e69 | 2591 | } |
26b8003f CM |
2592 | |
2593 | update_block: | |
0b86a832 | 2594 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0); |
f5947066 CM |
2595 | if (ret) { |
2596 | printk("update block group failed for %Lu %Lu\n", | |
2597 | ins->objectid, ins->offset); | |
2598 | BUG(); | |
2599 | } | |
925baedd | 2600 | out: |
e6dcd2dc CM |
2601 | return ret; |
2602 | } | |
2603 | ||
2604 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 2605 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 2606 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2607 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
2608 | { |
2609 | int ret; | |
1c2308f8 CM |
2610 | |
2611 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) | |
2612 | return 0; | |
3bb1a1bc YZ |
2613 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
2614 | ref_generation, owner, ins); | |
e8569813 | 2615 | update_reserved_extents(root, ins->objectid, ins->offset, 0); |
e6dcd2dc CM |
2616 | return ret; |
2617 | } | |
e02119d5 CM |
2618 | |
2619 | /* | |
2620 | * this is used by the tree logging recovery code. It records that | |
2621 | * an extent has been allocated and makes sure to clear the free | |
2622 | * space cache bits as well | |
2623 | */ | |
2624 | int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 2625 | struct btrfs_root *root, u64 parent, |
e02119d5 | 2626 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2627 | u64 owner, struct btrfs_key *ins) |
e02119d5 CM |
2628 | { |
2629 | int ret; | |
2630 | struct btrfs_block_group_cache *block_group; | |
2631 | ||
e02119d5 | 2632 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
25179201 | 2633 | mutex_lock(&block_group->alloc_mutex); |
e02119d5 CM |
2634 | cache_block_group(root, block_group); |
2635 | ||
25179201 JB |
2636 | ret = btrfs_remove_free_space_lock(block_group, ins->objectid, |
2637 | ins->offset); | |
2638 | mutex_unlock(&block_group->alloc_mutex); | |
0f9dd46c | 2639 | BUG_ON(ret); |
3bb1a1bc YZ |
2640 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
2641 | ref_generation, owner, ins); | |
e02119d5 CM |
2642 | return ret; |
2643 | } | |
2644 | ||
e6dcd2dc CM |
2645 | /* |
2646 | * finds a free extent and does all the dirty work required for allocation | |
2647 | * returns the key for the extent through ins, and a tree buffer for | |
2648 | * the first block of the extent through buf. | |
2649 | * | |
2650 | * returns 0 if everything worked, non-zero otherwise. | |
2651 | */ | |
2652 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, | |
2653 | struct btrfs_root *root, | |
31840ae1 | 2654 | u64 num_bytes, u64 parent, u64 min_alloc_size, |
e6dcd2dc | 2655 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2656 | u64 owner_objectid, u64 empty_size, u64 hint_byte, |
e6dcd2dc CM |
2657 | u64 search_end, struct btrfs_key *ins, u64 data) |
2658 | { | |
2659 | int ret; | |
2660 | ||
e6dcd2dc CM |
2661 | ret = __btrfs_reserve_extent(trans, root, num_bytes, |
2662 | min_alloc_size, empty_size, hint_byte, | |
2663 | search_end, ins, data); | |
2664 | BUG_ON(ret); | |
d00aff00 | 2665 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
31840ae1 ZY |
2666 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, |
2667 | root_objectid, ref_generation, | |
3bb1a1bc | 2668 | owner_objectid, ins); |
d00aff00 | 2669 | BUG_ON(ret); |
e6dcd2dc | 2670 | |
e8569813 ZY |
2671 | } else { |
2672 | update_reserved_extents(root, ins->objectid, ins->offset, 1); | |
d00aff00 | 2673 | } |
925baedd | 2674 | return ret; |
fec577fb | 2675 | } |
65b51a00 CM |
2676 | |
2677 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, | |
2678 | struct btrfs_root *root, | |
2679 | u64 bytenr, u32 blocksize) | |
2680 | { | |
2681 | struct extent_buffer *buf; | |
2682 | ||
2683 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
2684 | if (!buf) | |
2685 | return ERR_PTR(-ENOMEM); | |
2686 | btrfs_set_header_generation(buf, trans->transid); | |
2687 | btrfs_tree_lock(buf); | |
2688 | clean_tree_block(trans, root, buf); | |
2689 | btrfs_set_buffer_uptodate(buf); | |
d0c803c4 CM |
2690 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
2691 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
2692 | buf->start + buf->len - 1, GFP_NOFS); | |
2693 | } else { | |
2694 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 2695 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 2696 | } |
65b51a00 CM |
2697 | trans->blocks_used++; |
2698 | return buf; | |
2699 | } | |
2700 | ||
fec577fb CM |
2701 | /* |
2702 | * helper function to allocate a block for a given tree | |
2703 | * returns the tree buffer or NULL. | |
2704 | */ | |
5f39d397 | 2705 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
7bb86316 | 2706 | struct btrfs_root *root, |
31840ae1 | 2707 | u32 blocksize, u64 parent, |
7bb86316 CM |
2708 | u64 root_objectid, |
2709 | u64 ref_generation, | |
7bb86316 CM |
2710 | int level, |
2711 | u64 hint, | |
5f39d397 | 2712 | u64 empty_size) |
fec577fb | 2713 | { |
e2fa7227 | 2714 | struct btrfs_key ins; |
fec577fb | 2715 | int ret; |
5f39d397 | 2716 | struct extent_buffer *buf; |
fec577fb | 2717 | |
31840ae1 | 2718 | ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, |
3bb1a1bc | 2719 | root_objectid, ref_generation, level, |
31840ae1 | 2720 | empty_size, hint, (u64)-1, &ins, 0); |
fec577fb | 2721 | if (ret) { |
54aa1f4d CM |
2722 | BUG_ON(ret > 0); |
2723 | return ERR_PTR(ret); | |
fec577fb | 2724 | } |
55c69072 | 2725 | |
65b51a00 | 2726 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize); |
fec577fb CM |
2727 | return buf; |
2728 | } | |
a28ec197 | 2729 | |
e02119d5 CM |
2730 | int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, |
2731 | struct btrfs_root *root, struct extent_buffer *leaf) | |
6407bf6d | 2732 | { |
7bb86316 CM |
2733 | u64 leaf_owner; |
2734 | u64 leaf_generation; | |
5f39d397 | 2735 | struct btrfs_key key; |
6407bf6d CM |
2736 | struct btrfs_file_extent_item *fi; |
2737 | int i; | |
2738 | int nritems; | |
2739 | int ret; | |
2740 | ||
5f39d397 CM |
2741 | BUG_ON(!btrfs_is_leaf(leaf)); |
2742 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
2743 | leaf_owner = btrfs_header_owner(leaf); |
2744 | leaf_generation = btrfs_header_generation(leaf); | |
2745 | ||
6407bf6d | 2746 | for (i = 0; i < nritems; i++) { |
db94535d | 2747 | u64 disk_bytenr; |
e34a5b4f | 2748 | cond_resched(); |
5f39d397 CM |
2749 | |
2750 | btrfs_item_key_to_cpu(leaf, &key, i); | |
2751 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d CM |
2752 | continue; |
2753 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
5f39d397 CM |
2754 | if (btrfs_file_extent_type(leaf, fi) == |
2755 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 2756 | continue; |
6407bf6d CM |
2757 | /* |
2758 | * FIXME make sure to insert a trans record that | |
2759 | * repeats the snapshot del on crash | |
2760 | */ | |
db94535d CM |
2761 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
2762 | if (disk_bytenr == 0) | |
3a686375 | 2763 | continue; |
4a096752 | 2764 | |
925baedd | 2765 | ret = __btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 | 2766 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
31840ae1 | 2767 | leaf->start, leaf_owner, leaf_generation, |
3bb1a1bc | 2768 | key.objectid, 0); |
31840ae1 | 2769 | BUG_ON(ret); |
2dd3e67b CM |
2770 | |
2771 | atomic_inc(&root->fs_info->throttle_gen); | |
2772 | wake_up(&root->fs_info->transaction_throttle); | |
2773 | cond_resched(); | |
6407bf6d CM |
2774 | } |
2775 | return 0; | |
2776 | } | |
2777 | ||
e02119d5 CM |
2778 | static int noinline cache_drop_leaf_ref(struct btrfs_trans_handle *trans, |
2779 | struct btrfs_root *root, | |
2780 | struct btrfs_leaf_ref *ref) | |
31153d81 YZ |
2781 | { |
2782 | int i; | |
2783 | int ret; | |
2784 | struct btrfs_extent_info *info = ref->extents; | |
2785 | ||
31153d81 | 2786 | for (i = 0; i < ref->nritems; i++) { |
31840ae1 ZY |
2787 | ret = __btrfs_free_extent(trans, root, info->bytenr, |
2788 | info->num_bytes, ref->bytenr, | |
2789 | ref->owner, ref->generation, | |
3bb1a1bc | 2790 | info->objectid, 0); |
2dd3e67b CM |
2791 | |
2792 | atomic_inc(&root->fs_info->throttle_gen); | |
2793 | wake_up(&root->fs_info->transaction_throttle); | |
2794 | cond_resched(); | |
2795 | ||
31153d81 YZ |
2796 | BUG_ON(ret); |
2797 | info++; | |
2798 | } | |
31153d81 YZ |
2799 | |
2800 | return 0; | |
2801 | } | |
2802 | ||
333db94c CM |
2803 | int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len, |
2804 | u32 *refs) | |
2805 | { | |
017e5369 | 2806 | int ret; |
f87f057b | 2807 | |
31840ae1 | 2808 | ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs); |
f87f057b CM |
2809 | BUG_ON(ret); |
2810 | ||
2811 | #if 0 // some debugging code in case we see problems here | |
2812 | /* if the refs count is one, it won't get increased again. But | |
2813 | * if the ref count is > 1, someone may be decreasing it at | |
2814 | * the same time we are. | |
2815 | */ | |
2816 | if (*refs != 1) { | |
2817 | struct extent_buffer *eb = NULL; | |
2818 | eb = btrfs_find_create_tree_block(root, start, len); | |
2819 | if (eb) | |
2820 | btrfs_tree_lock(eb); | |
2821 | ||
2822 | mutex_lock(&root->fs_info->alloc_mutex); | |
2823 | ret = lookup_extent_ref(NULL, root, start, len, refs); | |
2824 | BUG_ON(ret); | |
2825 | mutex_unlock(&root->fs_info->alloc_mutex); | |
2826 | ||
2827 | if (eb) { | |
2828 | btrfs_tree_unlock(eb); | |
2829 | free_extent_buffer(eb); | |
2830 | } | |
2831 | if (*refs == 1) { | |
2832 | printk("block %llu went down to one during drop_snap\n", | |
2833 | (unsigned long long)start); | |
2834 | } | |
2835 | ||
2836 | } | |
2837 | #endif | |
2838 | ||
e7a84565 | 2839 | cond_resched(); |
017e5369 | 2840 | return ret; |
333db94c CM |
2841 | } |
2842 | ||
9aca1d51 CM |
2843 | /* |
2844 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
2845 | * counts as it goes. | |
2846 | */ | |
98ed5174 CM |
2847 | static int noinline walk_down_tree(struct btrfs_trans_handle *trans, |
2848 | struct btrfs_root *root, | |
2849 | struct btrfs_path *path, int *level) | |
20524f02 | 2850 | { |
7bb86316 CM |
2851 | u64 root_owner; |
2852 | u64 root_gen; | |
2853 | u64 bytenr; | |
ca7a79ad | 2854 | u64 ptr_gen; |
5f39d397 CM |
2855 | struct extent_buffer *next; |
2856 | struct extent_buffer *cur; | |
7bb86316 | 2857 | struct extent_buffer *parent; |
31153d81 | 2858 | struct btrfs_leaf_ref *ref; |
db94535d | 2859 | u32 blocksize; |
20524f02 CM |
2860 | int ret; |
2861 | u32 refs; | |
2862 | ||
5caf2a00 CM |
2863 | WARN_ON(*level < 0); |
2864 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
333db94c | 2865 | ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start, |
db94535d | 2866 | path->nodes[*level]->len, &refs); |
20524f02 CM |
2867 | BUG_ON(ret); |
2868 | if (refs > 1) | |
2869 | goto out; | |
e011599b | 2870 | |
9aca1d51 CM |
2871 | /* |
2872 | * walk down to the last node level and free all the leaves | |
2873 | */ | |
6407bf6d | 2874 | while(*level >= 0) { |
5caf2a00 CM |
2875 | WARN_ON(*level < 0); |
2876 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 2877 | cur = path->nodes[*level]; |
e011599b | 2878 | |
5f39d397 | 2879 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 2880 | WARN_ON(1); |
e011599b | 2881 | |
7518a238 | 2882 | if (path->slots[*level] >= |
5f39d397 | 2883 | btrfs_header_nritems(cur)) |
20524f02 | 2884 | break; |
6407bf6d | 2885 | if (*level == 0) { |
e02119d5 | 2886 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
6407bf6d CM |
2887 | BUG_ON(ret); |
2888 | break; | |
2889 | } | |
db94535d | 2890 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
ca7a79ad | 2891 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
db94535d | 2892 | blocksize = btrfs_level_size(root, *level - 1); |
925baedd | 2893 | |
333db94c | 2894 | ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs); |
6407bf6d CM |
2895 | BUG_ON(ret); |
2896 | if (refs != 1) { | |
7bb86316 CM |
2897 | parent = path->nodes[*level]; |
2898 | root_owner = btrfs_header_owner(parent); | |
2899 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 2900 | path->slots[*level]++; |
f87f057b | 2901 | |
925baedd | 2902 | ret = __btrfs_free_extent(trans, root, bytenr, |
31840ae1 | 2903 | blocksize, parent->start, |
3bb1a1bc YZ |
2904 | root_owner, root_gen, |
2905 | *level - 1, 1); | |
20524f02 | 2906 | BUG_ON(ret); |
18e35e0a CM |
2907 | |
2908 | atomic_inc(&root->fs_info->throttle_gen); | |
2909 | wake_up(&root->fs_info->transaction_throttle); | |
2dd3e67b | 2910 | cond_resched(); |
18e35e0a | 2911 | |
20524f02 CM |
2912 | continue; |
2913 | } | |
f87f057b CM |
2914 | /* |
2915 | * at this point, we have a single ref, and since the | |
2916 | * only place referencing this extent is a dead root | |
2917 | * the reference count should never go higher. | |
2918 | * So, we don't need to check it again | |
2919 | */ | |
31153d81 | 2920 | if (*level == 1) { |
017e5369 | 2921 | ref = btrfs_lookup_leaf_ref(root, bytenr); |
1a40e23b ZY |
2922 | if (ref && ref->generation != ptr_gen) { |
2923 | btrfs_free_leaf_ref(root, ref); | |
2924 | ref = NULL; | |
2925 | } | |
31153d81 | 2926 | if (ref) { |
e02119d5 | 2927 | ret = cache_drop_leaf_ref(trans, root, ref); |
31153d81 YZ |
2928 | BUG_ON(ret); |
2929 | btrfs_remove_leaf_ref(root, ref); | |
bcc63abb | 2930 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
2931 | *level = 0; |
2932 | break; | |
2933 | } | |
3bb1a1bc | 2934 | if (printk_ratelimit()) { |
37d1aeee CM |
2935 | printk("leaf ref miss for bytenr %llu\n", |
2936 | (unsigned long long)bytenr); | |
3bb1a1bc | 2937 | } |
31153d81 | 2938 | } |
db94535d | 2939 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
1259ab75 | 2940 | if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
5f39d397 | 2941 | free_extent_buffer(next); |
333db94c | 2942 | |
ca7a79ad CM |
2943 | next = read_tree_block(root, bytenr, blocksize, |
2944 | ptr_gen); | |
e7a84565 | 2945 | cond_resched(); |
f87f057b CM |
2946 | #if 0 |
2947 | /* | |
2948 | * this is a debugging check and can go away | |
2949 | * the ref should never go all the way down to 1 | |
2950 | * at this point | |
2951 | */ | |
e6dcd2dc CM |
2952 | ret = lookup_extent_ref(NULL, root, bytenr, blocksize, |
2953 | &refs); | |
e9d0b13b | 2954 | BUG_ON(ret); |
f87f057b CM |
2955 | WARN_ON(refs != 1); |
2956 | #endif | |
e9d0b13b | 2957 | } |
5caf2a00 | 2958 | WARN_ON(*level <= 0); |
83e15a28 | 2959 | if (path->nodes[*level-1]) |
5f39d397 | 2960 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 2961 | path->nodes[*level-1] = next; |
5f39d397 | 2962 | *level = btrfs_header_level(next); |
20524f02 | 2963 | path->slots[*level] = 0; |
2dd3e67b | 2964 | cond_resched(); |
20524f02 CM |
2965 | } |
2966 | out: | |
5caf2a00 CM |
2967 | WARN_ON(*level < 0); |
2968 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
2969 | |
2970 | if (path->nodes[*level] == root->node) { | |
7bb86316 | 2971 | parent = path->nodes[*level]; |
31153d81 | 2972 | bytenr = path->nodes[*level]->start; |
7bb86316 CM |
2973 | } else { |
2974 | parent = path->nodes[*level + 1]; | |
31153d81 | 2975 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
7bb86316 CM |
2976 | } |
2977 | ||
31153d81 YZ |
2978 | blocksize = btrfs_level_size(root, *level); |
2979 | root_owner = btrfs_header_owner(parent); | |
7bb86316 | 2980 | root_gen = btrfs_header_generation(parent); |
31153d81 YZ |
2981 | |
2982 | ret = __btrfs_free_extent(trans, root, bytenr, blocksize, | |
31840ae1 | 2983 | parent->start, root_owner, root_gen, |
3bb1a1bc | 2984 | *level, 1); |
5f39d397 | 2985 | free_extent_buffer(path->nodes[*level]); |
20524f02 CM |
2986 | path->nodes[*level] = NULL; |
2987 | *level += 1; | |
2988 | BUG_ON(ret); | |
f87f057b | 2989 | |
e7a84565 | 2990 | cond_resched(); |
20524f02 CM |
2991 | return 0; |
2992 | } | |
2993 | ||
f82d02d9 YZ |
2994 | /* |
2995 | * helper function for drop_subtree, this function is similar to | |
2996 | * walk_down_tree. The main difference is that it checks reference | |
2997 | * counts while tree blocks are locked. | |
2998 | */ | |
2999 | static int noinline walk_down_subtree(struct btrfs_trans_handle *trans, | |
3000 | struct btrfs_root *root, | |
3001 | struct btrfs_path *path, int *level) | |
3002 | { | |
3003 | struct extent_buffer *next; | |
3004 | struct extent_buffer *cur; | |
3005 | struct extent_buffer *parent; | |
3006 | u64 bytenr; | |
3007 | u64 ptr_gen; | |
3008 | u32 blocksize; | |
3009 | u32 refs; | |
3010 | int ret; | |
3011 | ||
3012 | cur = path->nodes[*level]; | |
3013 | ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len, | |
3014 | &refs); | |
3015 | BUG_ON(ret); | |
3016 | if (refs > 1) | |
3017 | goto out; | |
3018 | ||
3019 | while (*level >= 0) { | |
3020 | cur = path->nodes[*level]; | |
3021 | if (*level == 0) { | |
3022 | ret = btrfs_drop_leaf_ref(trans, root, cur); | |
3023 | BUG_ON(ret); | |
3024 | clean_tree_block(trans, root, cur); | |
3025 | break; | |
3026 | } | |
3027 | if (path->slots[*level] >= btrfs_header_nritems(cur)) { | |
3028 | clean_tree_block(trans, root, cur); | |
3029 | break; | |
3030 | } | |
3031 | ||
3032 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
3033 | blocksize = btrfs_level_size(root, *level - 1); | |
3034 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
3035 | ||
3036 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); | |
3037 | btrfs_tree_lock(next); | |
3038 | ||
3039 | ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize, | |
3040 | &refs); | |
3041 | BUG_ON(ret); | |
3042 | if (refs > 1) { | |
3043 | parent = path->nodes[*level]; | |
3044 | ret = btrfs_free_extent(trans, root, bytenr, | |
3045 | blocksize, parent->start, | |
3046 | btrfs_header_owner(parent), | |
3047 | btrfs_header_generation(parent), | |
3048 | *level - 1, 1); | |
3049 | BUG_ON(ret); | |
3050 | path->slots[*level]++; | |
3051 | btrfs_tree_unlock(next); | |
3052 | free_extent_buffer(next); | |
3053 | continue; | |
3054 | } | |
3055 | ||
3056 | *level = btrfs_header_level(next); | |
3057 | path->nodes[*level] = next; | |
3058 | path->slots[*level] = 0; | |
3059 | path->locks[*level] = 1; | |
3060 | cond_resched(); | |
3061 | } | |
3062 | out: | |
3063 | parent = path->nodes[*level + 1]; | |
3064 | bytenr = path->nodes[*level]->start; | |
3065 | blocksize = path->nodes[*level]->len; | |
3066 | ||
3067 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, | |
3068 | parent->start, btrfs_header_owner(parent), | |
3069 | btrfs_header_generation(parent), *level, 1); | |
3070 | BUG_ON(ret); | |
3071 | ||
3072 | if (path->locks[*level]) { | |
3073 | btrfs_tree_unlock(path->nodes[*level]); | |
3074 | path->locks[*level] = 0; | |
3075 | } | |
3076 | free_extent_buffer(path->nodes[*level]); | |
3077 | path->nodes[*level] = NULL; | |
3078 | *level += 1; | |
3079 | cond_resched(); | |
3080 | return 0; | |
3081 | } | |
3082 | ||
9aca1d51 CM |
3083 | /* |
3084 | * helper for dropping snapshots. This walks back up the tree in the path | |
3085 | * to find the first node higher up where we haven't yet gone through | |
3086 | * all the slots | |
3087 | */ | |
98ed5174 CM |
3088 | static int noinline walk_up_tree(struct btrfs_trans_handle *trans, |
3089 | struct btrfs_root *root, | |
f82d02d9 YZ |
3090 | struct btrfs_path *path, |
3091 | int *level, int max_level) | |
20524f02 | 3092 | { |
7bb86316 CM |
3093 | u64 root_owner; |
3094 | u64 root_gen; | |
3095 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
3096 | int i; |
3097 | int slot; | |
3098 | int ret; | |
9f3a7427 | 3099 | |
f82d02d9 | 3100 | for (i = *level; i < max_level && path->nodes[i]; i++) { |
20524f02 | 3101 | slot = path->slots[i]; |
5f39d397 CM |
3102 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
3103 | struct extent_buffer *node; | |
3104 | struct btrfs_disk_key disk_key; | |
3105 | node = path->nodes[i]; | |
20524f02 CM |
3106 | path->slots[i]++; |
3107 | *level = i; | |
9f3a7427 | 3108 | WARN_ON(*level == 0); |
5f39d397 | 3109 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 3110 | memcpy(&root_item->drop_progress, |
5f39d397 | 3111 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 3112 | root_item->drop_level = i; |
20524f02 CM |
3113 | return 0; |
3114 | } else { | |
31840ae1 ZY |
3115 | struct extent_buffer *parent; |
3116 | if (path->nodes[*level] == root->node) | |
3117 | parent = path->nodes[*level]; | |
3118 | else | |
3119 | parent = path->nodes[*level + 1]; | |
3120 | ||
3121 | root_owner = btrfs_header_owner(parent); | |
3122 | root_gen = btrfs_header_generation(parent); | |
f82d02d9 YZ |
3123 | |
3124 | clean_tree_block(trans, root, path->nodes[*level]); | |
e089f05c | 3125 | ret = btrfs_free_extent(trans, root, |
db94535d | 3126 | path->nodes[*level]->start, |
7bb86316 | 3127 | path->nodes[*level]->len, |
3bb1a1bc YZ |
3128 | parent->start, root_owner, |
3129 | root_gen, *level, 1); | |
6407bf6d | 3130 | BUG_ON(ret); |
f82d02d9 YZ |
3131 | if (path->locks[*level]) { |
3132 | btrfs_tree_unlock(path->nodes[*level]); | |
3133 | path->locks[*level] = 0; | |
3134 | } | |
5f39d397 | 3135 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 3136 | path->nodes[*level] = NULL; |
20524f02 | 3137 | *level = i + 1; |
20524f02 CM |
3138 | } |
3139 | } | |
3140 | return 1; | |
3141 | } | |
3142 | ||
9aca1d51 CM |
3143 | /* |
3144 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
3145 | * the tree freeing any blocks that have a ref count of zero after being | |
3146 | * decremented. | |
3147 | */ | |
e089f05c | 3148 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 3149 | *root) |
20524f02 | 3150 | { |
3768f368 | 3151 | int ret = 0; |
9aca1d51 | 3152 | int wret; |
20524f02 | 3153 | int level; |
5caf2a00 | 3154 | struct btrfs_path *path; |
20524f02 CM |
3155 | int i; |
3156 | int orig_level; | |
9f3a7427 | 3157 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 3158 | |
a2135011 | 3159 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
5caf2a00 CM |
3160 | path = btrfs_alloc_path(); |
3161 | BUG_ON(!path); | |
20524f02 | 3162 | |
5f39d397 | 3163 | level = btrfs_header_level(root->node); |
20524f02 | 3164 | orig_level = level; |
9f3a7427 CM |
3165 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
3166 | path->nodes[level] = root->node; | |
f510cfec | 3167 | extent_buffer_get(root->node); |
9f3a7427 CM |
3168 | path->slots[level] = 0; |
3169 | } else { | |
3170 | struct btrfs_key key; | |
5f39d397 CM |
3171 | struct btrfs_disk_key found_key; |
3172 | struct extent_buffer *node; | |
6702ed49 | 3173 | |
9f3a7427 | 3174 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
3175 | level = root_item->drop_level; |
3176 | path->lowest_level = level; | |
9f3a7427 | 3177 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 3178 | if (wret < 0) { |
9f3a7427 CM |
3179 | ret = wret; |
3180 | goto out; | |
3181 | } | |
5f39d397 CM |
3182 | node = path->nodes[level]; |
3183 | btrfs_node_key(node, &found_key, path->slots[level]); | |
3184 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
3185 | sizeof(found_key))); | |
7d9eb12c CM |
3186 | /* |
3187 | * unlock our path, this is safe because only this | |
3188 | * function is allowed to delete this snapshot | |
3189 | */ | |
925baedd CM |
3190 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
3191 | if (path->nodes[i] && path->locks[i]) { | |
3192 | path->locks[i] = 0; | |
3193 | btrfs_tree_unlock(path->nodes[i]); | |
3194 | } | |
3195 | } | |
9f3a7427 | 3196 | } |
20524f02 | 3197 | while(1) { |
5caf2a00 | 3198 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 3199 | if (wret > 0) |
20524f02 | 3200 | break; |
9aca1d51 CM |
3201 | if (wret < 0) |
3202 | ret = wret; | |
3203 | ||
f82d02d9 YZ |
3204 | wret = walk_up_tree(trans, root, path, &level, |
3205 | BTRFS_MAX_LEVEL); | |
9aca1d51 | 3206 | if (wret > 0) |
20524f02 | 3207 | break; |
9aca1d51 CM |
3208 | if (wret < 0) |
3209 | ret = wret; | |
e7a84565 CM |
3210 | if (trans->transaction->in_commit) { |
3211 | ret = -EAGAIN; | |
3212 | break; | |
3213 | } | |
18e35e0a | 3214 | atomic_inc(&root->fs_info->throttle_gen); |
017e5369 | 3215 | wake_up(&root->fs_info->transaction_throttle); |
20524f02 | 3216 | } |
83e15a28 | 3217 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 3218 | if (path->nodes[i]) { |
5f39d397 | 3219 | free_extent_buffer(path->nodes[i]); |
0f82731f | 3220 | path->nodes[i] = NULL; |
83e15a28 | 3221 | } |
20524f02 | 3222 | } |
9f3a7427 | 3223 | out: |
5caf2a00 | 3224 | btrfs_free_path(path); |
9aca1d51 | 3225 | return ret; |
20524f02 | 3226 | } |
9078a3e1 | 3227 | |
f82d02d9 YZ |
3228 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
3229 | struct btrfs_root *root, | |
3230 | struct extent_buffer *node, | |
3231 | struct extent_buffer *parent) | |
3232 | { | |
3233 | struct btrfs_path *path; | |
3234 | int level; | |
3235 | int parent_level; | |
3236 | int ret = 0; | |
3237 | int wret; | |
3238 | ||
3239 | path = btrfs_alloc_path(); | |
3240 | BUG_ON(!path); | |
3241 | ||
3242 | BUG_ON(!btrfs_tree_locked(parent)); | |
3243 | parent_level = btrfs_header_level(parent); | |
3244 | extent_buffer_get(parent); | |
3245 | path->nodes[parent_level] = parent; | |
3246 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
3247 | ||
3248 | BUG_ON(!btrfs_tree_locked(node)); | |
3249 | level = btrfs_header_level(node); | |
3250 | extent_buffer_get(node); | |
3251 | path->nodes[level] = node; | |
3252 | path->slots[level] = 0; | |
3253 | ||
3254 | while (1) { | |
3255 | wret = walk_down_subtree(trans, root, path, &level); | |
3256 | if (wret < 0) | |
3257 | ret = wret; | |
3258 | if (wret != 0) | |
3259 | break; | |
3260 | ||
3261 | wret = walk_up_tree(trans, root, path, &level, parent_level); | |
3262 | if (wret < 0) | |
3263 | ret = wret; | |
3264 | if (wret != 0) | |
3265 | break; | |
3266 | } | |
3267 | ||
3268 | btrfs_free_path(path); | |
3269 | return ret; | |
3270 | } | |
3271 | ||
8e7bf94f CM |
3272 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
3273 | unsigned long nr) | |
3274 | { | |
3275 | return min(last, start + nr - 1); | |
3276 | } | |
3277 | ||
98ed5174 CM |
3278 | static int noinline relocate_inode_pages(struct inode *inode, u64 start, |
3279 | u64 len) | |
edbd8d4e CM |
3280 | { |
3281 | u64 page_start; | |
3282 | u64 page_end; | |
1a40e23b | 3283 | unsigned long first_index; |
edbd8d4e | 3284 | unsigned long last_index; |
edbd8d4e CM |
3285 | unsigned long i; |
3286 | struct page *page; | |
d1310b2e | 3287 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 3288 | struct file_ra_state *ra; |
3eaa2885 | 3289 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
3290 | unsigned int total_read = 0; |
3291 | unsigned int total_dirty = 0; | |
3292 | int ret = 0; | |
4313b399 CM |
3293 | |
3294 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
3295 | |
3296 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 3297 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
3298 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
3299 | ||
1a40e23b ZY |
3300 | /* make sure the dirty trick played by the caller work */ |
3301 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
3302 | first_index, last_index); | |
3303 | if (ret) | |
3304 | goto out_unlock; | |
8e7bf94f | 3305 | |
4313b399 | 3306 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 3307 | |
1a40e23b ZY |
3308 | for (i = first_index ; i <= last_index; i++) { |
3309 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 3310 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 3311 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
3312 | } |
3313 | total_read++; | |
3eaa2885 CM |
3314 | again: |
3315 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 3316 | BUG_ON(1); |
edbd8d4e | 3317 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 3318 | if (!page) { |
1a40e23b | 3319 | ret = -ENOMEM; |
edbd8d4e | 3320 | goto out_unlock; |
a061fc8d | 3321 | } |
edbd8d4e CM |
3322 | if (!PageUptodate(page)) { |
3323 | btrfs_readpage(NULL, page); | |
3324 | lock_page(page); | |
3325 | if (!PageUptodate(page)) { | |
3326 | unlock_page(page); | |
3327 | page_cache_release(page); | |
1a40e23b | 3328 | ret = -EIO; |
edbd8d4e CM |
3329 | goto out_unlock; |
3330 | } | |
3331 | } | |
ec44a35c | 3332 | wait_on_page_writeback(page); |
3eaa2885 | 3333 | |
edbd8d4e CM |
3334 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
3335 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 3336 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 3337 | |
3eaa2885 CM |
3338 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
3339 | if (ordered) { | |
3340 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3341 | unlock_page(page); | |
3342 | page_cache_release(page); | |
3343 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3344 | btrfs_put_ordered_extent(ordered); | |
3345 | goto again; | |
3346 | } | |
3347 | set_page_extent_mapped(page); | |
3348 | ||
ea8c2819 | 3349 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b ZY |
3350 | if (i == first_index) |
3351 | set_extent_bits(io_tree, page_start, page_end, | |
3352 | EXTENT_BOUNDARY, GFP_NOFS); | |
3353 | ||
a061fc8d | 3354 | set_page_dirty(page); |
1a40e23b | 3355 | total_dirty++; |
edbd8d4e | 3356 | |
d1310b2e | 3357 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
3358 | unlock_page(page); |
3359 | page_cache_release(page); | |
3360 | } | |
3361 | ||
3362 | out_unlock: | |
ec44a35c | 3363 | kfree(ra); |
edbd8d4e | 3364 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
3365 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
3366 | return ret; | |
edbd8d4e CM |
3367 | } |
3368 | ||
1a40e23b ZY |
3369 | static int noinline relocate_data_extent(struct inode *reloc_inode, |
3370 | struct btrfs_key *extent_key, | |
3371 | u64 offset) | |
3372 | { | |
3373 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
3374 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
3375 | struct extent_map *em; | |
bf4ef679 | 3376 | |
1a40e23b ZY |
3377 | em = alloc_extent_map(GFP_NOFS); |
3378 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 3379 | |
1a40e23b ZY |
3380 | em->start = extent_key->objectid - offset; |
3381 | em->len = extent_key->offset; | |
c8b97818 | 3382 | em->block_len = extent_key->offset; |
1a40e23b ZY |
3383 | em->block_start = extent_key->objectid; |
3384 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
3385 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
3386 | ||
3387 | /* setup extent map to cheat btrfs_readpage */ | |
3388 | mutex_lock(&BTRFS_I(reloc_inode)->extent_mutex); | |
3389 | while (1) { | |
3390 | int ret; | |
3391 | spin_lock(&em_tree->lock); | |
3392 | ret = add_extent_mapping(em_tree, em); | |
3393 | spin_unlock(&em_tree->lock); | |
3394 | if (ret != -EEXIST) { | |
3395 | free_extent_map(em); | |
bf4ef679 CM |
3396 | break; |
3397 | } | |
1a40e23b ZY |
3398 | btrfs_drop_extent_cache(reloc_inode, em->start, |
3399 | em->start + em->len - 1, 0); | |
bf4ef679 | 3400 | } |
1a40e23b | 3401 | mutex_unlock(&BTRFS_I(reloc_inode)->extent_mutex); |
bf4ef679 | 3402 | |
1a40e23b ZY |
3403 | return relocate_inode_pages(reloc_inode, extent_key->objectid - offset, |
3404 | extent_key->offset); | |
3405 | } | |
edbd8d4e | 3406 | |
1a40e23b ZY |
3407 | struct btrfs_ref_path { |
3408 | u64 extent_start; | |
3409 | u64 nodes[BTRFS_MAX_LEVEL]; | |
3410 | u64 root_objectid; | |
3411 | u64 root_generation; | |
3412 | u64 owner_objectid; | |
1a40e23b ZY |
3413 | u32 num_refs; |
3414 | int lowest_level; | |
3415 | int current_level; | |
f82d02d9 YZ |
3416 | int shared_level; |
3417 | ||
3418 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
3419 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 3420 | }; |
7d9eb12c | 3421 | |
1a40e23b | 3422 | struct disk_extent { |
c8b97818 | 3423 | u64 ram_bytes; |
1a40e23b ZY |
3424 | u64 disk_bytenr; |
3425 | u64 disk_num_bytes; | |
3426 | u64 offset; | |
3427 | u64 num_bytes; | |
c8b97818 CM |
3428 | u8 compression; |
3429 | u8 encryption; | |
3430 | u16 other_encoding; | |
1a40e23b | 3431 | }; |
4313b399 | 3432 | |
1a40e23b ZY |
3433 | static int is_cowonly_root(u64 root_objectid) |
3434 | { | |
3435 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
3436 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
3437 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
3438 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
3439 | root_objectid == BTRFS_TREE_LOG_OBJECTID) | |
3440 | return 1; | |
3441 | return 0; | |
3442 | } | |
edbd8d4e | 3443 | |
1a40e23b ZY |
3444 | static int noinline __next_ref_path(struct btrfs_trans_handle *trans, |
3445 | struct btrfs_root *extent_root, | |
3446 | struct btrfs_ref_path *ref_path, | |
3447 | int first_time) | |
3448 | { | |
3449 | struct extent_buffer *leaf; | |
3450 | struct btrfs_path *path; | |
3451 | struct btrfs_extent_ref *ref; | |
3452 | struct btrfs_key key; | |
3453 | struct btrfs_key found_key; | |
3454 | u64 bytenr; | |
3455 | u32 nritems; | |
3456 | int level; | |
3457 | int ret = 1; | |
edbd8d4e | 3458 | |
1a40e23b ZY |
3459 | path = btrfs_alloc_path(); |
3460 | if (!path) | |
3461 | return -ENOMEM; | |
bf4ef679 | 3462 | |
1a40e23b ZY |
3463 | if (first_time) { |
3464 | ref_path->lowest_level = -1; | |
3465 | ref_path->current_level = -1; | |
f82d02d9 | 3466 | ref_path->shared_level = -1; |
1a40e23b ZY |
3467 | goto walk_up; |
3468 | } | |
3469 | walk_down: | |
3470 | level = ref_path->current_level - 1; | |
3471 | while (level >= -1) { | |
3472 | u64 parent; | |
3473 | if (level < ref_path->lowest_level) | |
3474 | break; | |
bf4ef679 | 3475 | |
1a40e23b ZY |
3476 | if (level >= 0) { |
3477 | bytenr = ref_path->nodes[level]; | |
3478 | } else { | |
3479 | bytenr = ref_path->extent_start; | |
3480 | } | |
3481 | BUG_ON(bytenr == 0); | |
bf4ef679 | 3482 | |
1a40e23b ZY |
3483 | parent = ref_path->nodes[level + 1]; |
3484 | ref_path->nodes[level + 1] = 0; | |
3485 | ref_path->current_level = level; | |
3486 | BUG_ON(parent == 0); | |
0ef3e66b | 3487 | |
1a40e23b ZY |
3488 | key.objectid = bytenr; |
3489 | key.offset = parent + 1; | |
3490 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 3491 | |
1a40e23b ZY |
3492 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
3493 | if (ret < 0) | |
edbd8d4e | 3494 | goto out; |
1a40e23b | 3495 | BUG_ON(ret == 0); |
7d9eb12c | 3496 | |
1a40e23b ZY |
3497 | leaf = path->nodes[0]; |
3498 | nritems = btrfs_header_nritems(leaf); | |
3499 | if (path->slots[0] >= nritems) { | |
3500 | ret = btrfs_next_leaf(extent_root, path); | |
3501 | if (ret < 0) | |
3502 | goto out; | |
3503 | if (ret > 0) | |
3504 | goto next; | |
3505 | leaf = path->nodes[0]; | |
3506 | } | |
0ef3e66b | 3507 | |
1a40e23b ZY |
3508 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
3509 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
3510 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
3511 | if (level < ref_path->shared_level) | |
3512 | ref_path->shared_level = level; | |
1a40e23b | 3513 | goto found; |
f82d02d9 | 3514 | } |
1a40e23b ZY |
3515 | next: |
3516 | level--; | |
3517 | btrfs_release_path(extent_root, path); | |
3518 | if (need_resched()) { | |
1a40e23b | 3519 | cond_resched(); |
1a40e23b ZY |
3520 | } |
3521 | } | |
3522 | /* reached lowest level */ | |
3523 | ret = 1; | |
3524 | goto out; | |
3525 | walk_up: | |
3526 | level = ref_path->current_level; | |
3527 | while (level < BTRFS_MAX_LEVEL - 1) { | |
3528 | u64 ref_objectid; | |
3529 | if (level >= 0) { | |
3530 | bytenr = ref_path->nodes[level]; | |
3531 | } else { | |
3532 | bytenr = ref_path->extent_start; | |
3533 | } | |
3534 | BUG_ON(bytenr == 0); | |
edbd8d4e | 3535 | |
1a40e23b ZY |
3536 | key.objectid = bytenr; |
3537 | key.offset = 0; | |
3538 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 3539 | |
1a40e23b ZY |
3540 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
3541 | if (ret < 0) | |
3542 | goto out; | |
edbd8d4e | 3543 | |
1a40e23b ZY |
3544 | leaf = path->nodes[0]; |
3545 | nritems = btrfs_header_nritems(leaf); | |
3546 | if (path->slots[0] >= nritems) { | |
3547 | ret = btrfs_next_leaf(extent_root, path); | |
3548 | if (ret < 0) | |
3549 | goto out; | |
3550 | if (ret > 0) { | |
3551 | /* the extent was freed by someone */ | |
3552 | if (ref_path->lowest_level == level) | |
3553 | goto out; | |
3554 | btrfs_release_path(extent_root, path); | |
3555 | goto walk_down; | |
3556 | } | |
3557 | leaf = path->nodes[0]; | |
3558 | } | |
edbd8d4e | 3559 | |
1a40e23b ZY |
3560 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
3561 | if (found_key.objectid != bytenr || | |
3562 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
3563 | /* the extent was freed by someone */ | |
3564 | if (ref_path->lowest_level == level) { | |
3565 | ret = 1; | |
3566 | goto out; | |
3567 | } | |
3568 | btrfs_release_path(extent_root, path); | |
3569 | goto walk_down; | |
3570 | } | |
3571 | found: | |
3572 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
3573 | struct btrfs_extent_ref); | |
3574 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
3575 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
3576 | if (first_time) { | |
3577 | level = (int)ref_objectid; | |
3578 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
3579 | ref_path->lowest_level = level; | |
3580 | ref_path->current_level = level; | |
3581 | ref_path->nodes[level] = bytenr; | |
3582 | } else { | |
3583 | WARN_ON(ref_objectid != level); | |
3584 | } | |
3585 | } else { | |
3586 | WARN_ON(level != -1); | |
3587 | } | |
3588 | first_time = 0; | |
bf4ef679 | 3589 | |
1a40e23b ZY |
3590 | if (ref_path->lowest_level == level) { |
3591 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
3592 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
3593 | } | |
bf4ef679 | 3594 | |
7d9eb12c | 3595 | /* |
1a40e23b ZY |
3596 | * the block is tree root or the block isn't in reference |
3597 | * counted tree. | |
7d9eb12c | 3598 | */ |
1a40e23b ZY |
3599 | if (found_key.objectid == found_key.offset || |
3600 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
3601 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
3602 | ref_path->root_generation = | |
3603 | btrfs_ref_generation(leaf, ref); | |
3604 | if (level < 0) { | |
3605 | /* special reference from the tree log */ | |
3606 | ref_path->nodes[0] = found_key.offset; | |
3607 | ref_path->current_level = 0; | |
3608 | } | |
3609 | ret = 0; | |
3610 | goto out; | |
3611 | } | |
7d9eb12c | 3612 | |
1a40e23b ZY |
3613 | level++; |
3614 | BUG_ON(ref_path->nodes[level] != 0); | |
3615 | ref_path->nodes[level] = found_key.offset; | |
3616 | ref_path->current_level = level; | |
bf4ef679 | 3617 | |
1a40e23b ZY |
3618 | /* |
3619 | * the reference was created in the running transaction, | |
3620 | * no need to continue walking up. | |
3621 | */ | |
3622 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
3623 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
3624 | ref_path->root_generation = | |
3625 | btrfs_ref_generation(leaf, ref); | |
3626 | ret = 0; | |
3627 | goto out; | |
7d9eb12c CM |
3628 | } |
3629 | ||
1a40e23b ZY |
3630 | btrfs_release_path(extent_root, path); |
3631 | if (need_resched()) { | |
1a40e23b | 3632 | cond_resched(); |
1a40e23b | 3633 | } |
7d9eb12c | 3634 | } |
1a40e23b ZY |
3635 | /* reached max tree level, but no tree root found. */ |
3636 | BUG(); | |
edbd8d4e | 3637 | out: |
1a40e23b ZY |
3638 | btrfs_free_path(path); |
3639 | return ret; | |
edbd8d4e CM |
3640 | } |
3641 | ||
1a40e23b ZY |
3642 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
3643 | struct btrfs_root *extent_root, | |
3644 | struct btrfs_ref_path *ref_path, | |
3645 | u64 extent_start) | |
a061fc8d | 3646 | { |
1a40e23b ZY |
3647 | memset(ref_path, 0, sizeof(*ref_path)); |
3648 | ref_path->extent_start = extent_start; | |
a061fc8d | 3649 | |
1a40e23b | 3650 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
3651 | } |
3652 | ||
1a40e23b ZY |
3653 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
3654 | struct btrfs_root *extent_root, | |
3655 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 3656 | { |
1a40e23b ZY |
3657 | return __next_ref_path(trans, extent_root, ref_path, 0); |
3658 | } | |
3659 | ||
3660 | static int noinline get_new_locations(struct inode *reloc_inode, | |
3661 | struct btrfs_key *extent_key, | |
3662 | u64 offset, int no_fragment, | |
3663 | struct disk_extent **extents, | |
3664 | int *nr_extents) | |
3665 | { | |
3666 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
3667 | struct btrfs_path *path; | |
3668 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 3669 | struct extent_buffer *leaf; |
1a40e23b ZY |
3670 | struct disk_extent *exts = *extents; |
3671 | struct btrfs_key found_key; | |
3672 | u64 cur_pos; | |
3673 | u64 last_byte; | |
edbd8d4e | 3674 | u32 nritems; |
1a40e23b ZY |
3675 | int nr = 0; |
3676 | int max = *nr_extents; | |
3677 | int ret; | |
edbd8d4e | 3678 | |
1a40e23b ZY |
3679 | WARN_ON(!no_fragment && *extents); |
3680 | if (!exts) { | |
3681 | max = 1; | |
3682 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
3683 | if (!exts) | |
3684 | return -ENOMEM; | |
a061fc8d | 3685 | } |
edbd8d4e | 3686 | |
1a40e23b ZY |
3687 | path = btrfs_alloc_path(); |
3688 | BUG_ON(!path); | |
edbd8d4e | 3689 | |
1a40e23b ZY |
3690 | cur_pos = extent_key->objectid - offset; |
3691 | last_byte = extent_key->objectid + extent_key->offset; | |
3692 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
3693 | cur_pos, 0); | |
3694 | if (ret < 0) | |
3695 | goto out; | |
3696 | if (ret > 0) { | |
3697 | ret = -ENOENT; | |
3698 | goto out; | |
3699 | } | |
edbd8d4e | 3700 | |
1a40e23b | 3701 | while (1) { |
edbd8d4e CM |
3702 | leaf = path->nodes[0]; |
3703 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
3704 | if (path->slots[0] >= nritems) { |
3705 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
3706 | if (ret < 0) |
3707 | goto out; | |
1a40e23b ZY |
3708 | if (ret > 0) |
3709 | break; | |
bf4ef679 | 3710 | leaf = path->nodes[0]; |
a061fc8d | 3711 | } |
edbd8d4e CM |
3712 | |
3713 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
3714 | if (found_key.offset != cur_pos || |
3715 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
3716 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
3717 | break; |
3718 | ||
1a40e23b ZY |
3719 | fi = btrfs_item_ptr(leaf, path->slots[0], |
3720 | struct btrfs_file_extent_item); | |
3721 | if (btrfs_file_extent_type(leaf, fi) != | |
3722 | BTRFS_FILE_EXTENT_REG || | |
3723 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 3724 | break; |
1a40e23b ZY |
3725 | |
3726 | if (nr == max) { | |
3727 | struct disk_extent *old = exts; | |
3728 | max *= 2; | |
3729 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
3730 | memcpy(exts, old, sizeof(*exts) * nr); | |
3731 | if (old != *extents) | |
3732 | kfree(old); | |
a061fc8d | 3733 | } |
edbd8d4e | 3734 | |
1a40e23b ZY |
3735 | exts[nr].disk_bytenr = |
3736 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
3737 | exts[nr].disk_num_bytes = | |
3738 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
3739 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
3740 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
3741 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
3742 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
3743 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
3744 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
3745 | fi); | |
1a40e23b ZY |
3746 | WARN_ON(exts[nr].offset > 0); |
3747 | WARN_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 3748 | |
1a40e23b ZY |
3749 | cur_pos += exts[nr].num_bytes; |
3750 | nr++; | |
3751 | ||
3752 | if (cur_pos + offset >= last_byte) | |
3753 | break; | |
3754 | ||
3755 | if (no_fragment) { | |
3756 | ret = 1; | |
edbd8d4e | 3757 | goto out; |
1a40e23b ZY |
3758 | } |
3759 | path->slots[0]++; | |
3760 | } | |
3761 | ||
3762 | WARN_ON(cur_pos + offset > last_byte); | |
3763 | if (cur_pos + offset < last_byte) { | |
3764 | ret = -ENOENT; | |
3765 | goto out; | |
edbd8d4e CM |
3766 | } |
3767 | ret = 0; | |
3768 | out: | |
1a40e23b ZY |
3769 | btrfs_free_path(path); |
3770 | if (ret) { | |
3771 | if (exts != *extents) | |
3772 | kfree(exts); | |
3773 | } else { | |
3774 | *extents = exts; | |
3775 | *nr_extents = nr; | |
3776 | } | |
3777 | return ret; | |
3778 | } | |
3779 | ||
3780 | static int noinline replace_one_extent(struct btrfs_trans_handle *trans, | |
3781 | struct btrfs_root *root, | |
3782 | struct btrfs_path *path, | |
3783 | struct btrfs_key *extent_key, | |
3784 | struct btrfs_key *leaf_key, | |
3785 | struct btrfs_ref_path *ref_path, | |
3786 | struct disk_extent *new_extents, | |
3787 | int nr_extents) | |
3788 | { | |
3789 | struct extent_buffer *leaf; | |
3790 | struct btrfs_file_extent_item *fi; | |
3791 | struct inode *inode = NULL; | |
3792 | struct btrfs_key key; | |
3793 | u64 lock_start = 0; | |
3794 | u64 lock_end = 0; | |
3795 | u64 num_bytes; | |
3796 | u64 ext_offset; | |
3797 | u64 first_pos; | |
3798 | u32 nritems; | |
3bb1a1bc | 3799 | int nr_scaned = 0; |
1a40e23b ZY |
3800 | int extent_locked = 0; |
3801 | int ret; | |
3802 | ||
3bb1a1bc YZ |
3803 | memcpy(&key, leaf_key, sizeof(key)); |
3804 | first_pos = INT_LIMIT(loff_t) - extent_key->offset; | |
1a40e23b | 3805 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
3806 | if (key.objectid < ref_path->owner_objectid || |
3807 | (key.objectid == ref_path->owner_objectid && | |
3808 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
3809 | key.objectid = ref_path->owner_objectid; | |
3810 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3811 | key.offset = 0; | |
3812 | } | |
1a40e23b ZY |
3813 | } |
3814 | ||
3815 | while (1) { | |
3816 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
3817 | if (ret < 0) | |
3818 | goto out; | |
3819 | ||
3820 | leaf = path->nodes[0]; | |
3821 | nritems = btrfs_header_nritems(leaf); | |
3822 | next: | |
3823 | if (extent_locked && ret > 0) { | |
3824 | /* | |
3825 | * the file extent item was modified by someone | |
3826 | * before the extent got locked. | |
3827 | */ | |
3828 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); | |
3829 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
3830 | lock_end, GFP_NOFS); | |
3831 | extent_locked = 0; | |
3832 | } | |
3833 | ||
3834 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 3835 | if (++nr_scaned > 2) |
1a40e23b ZY |
3836 | break; |
3837 | ||
3838 | BUG_ON(extent_locked); | |
3839 | ret = btrfs_next_leaf(root, path); | |
3840 | if (ret < 0) | |
3841 | goto out; | |
3842 | if (ret > 0) | |
3843 | break; | |
3844 | leaf = path->nodes[0]; | |
3845 | nritems = btrfs_header_nritems(leaf); | |
3846 | } | |
3847 | ||
3848 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
3849 | ||
3850 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
3851 | if ((key.objectid > ref_path->owner_objectid) || | |
3852 | (key.objectid == ref_path->owner_objectid && | |
3853 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
3854 | (key.offset >= first_pos + extent_key->offset)) | |
3855 | break; | |
3856 | } | |
3857 | ||
3858 | if (inode && key.objectid != inode->i_ino) { | |
3859 | BUG_ON(extent_locked); | |
3860 | btrfs_release_path(root, path); | |
3861 | mutex_unlock(&inode->i_mutex); | |
3862 | iput(inode); | |
3863 | inode = NULL; | |
3864 | continue; | |
3865 | } | |
3866 | ||
3867 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
3868 | path->slots[0]++; | |
3869 | ret = 1; | |
3870 | goto next; | |
3871 | } | |
3872 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
3873 | struct btrfs_file_extent_item); | |
3874 | if ((btrfs_file_extent_type(leaf, fi) != | |
3875 | BTRFS_FILE_EXTENT_REG) || | |
3876 | (btrfs_file_extent_disk_bytenr(leaf, fi) != | |
3877 | extent_key->objectid)) { | |
3878 | path->slots[0]++; | |
3879 | ret = 1; | |
3880 | goto next; | |
3881 | } | |
3882 | ||
3883 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
3884 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
3885 | ||
3886 | if (first_pos > key.offset - ext_offset) | |
3887 | first_pos = key.offset - ext_offset; | |
3888 | ||
3889 | if (!extent_locked) { | |
3890 | lock_start = key.offset; | |
3891 | lock_end = lock_start + num_bytes - 1; | |
3892 | } else { | |
3893 | BUG_ON(lock_start != key.offset); | |
3894 | BUG_ON(lock_end - lock_start + 1 < num_bytes); | |
3895 | } | |
3896 | ||
3897 | if (!inode) { | |
3898 | btrfs_release_path(root, path); | |
3899 | ||
3900 | inode = btrfs_iget_locked(root->fs_info->sb, | |
3901 | key.objectid, root); | |
3902 | if (inode->i_state & I_NEW) { | |
3903 | BTRFS_I(inode)->root = root; | |
3904 | BTRFS_I(inode)->location.objectid = | |
3905 | key.objectid; | |
3906 | BTRFS_I(inode)->location.type = | |
3907 | BTRFS_INODE_ITEM_KEY; | |
3908 | BTRFS_I(inode)->location.offset = 0; | |
3909 | btrfs_read_locked_inode(inode); | |
3910 | unlock_new_inode(inode); | |
3911 | } | |
3912 | /* | |
3913 | * some code call btrfs_commit_transaction while | |
3914 | * holding the i_mutex, so we can't use mutex_lock | |
3915 | * here. | |
3916 | */ | |
3917 | if (is_bad_inode(inode) || | |
3918 | !mutex_trylock(&inode->i_mutex)) { | |
3919 | iput(inode); | |
3920 | inode = NULL; | |
3921 | key.offset = (u64)-1; | |
3922 | goto skip; | |
3923 | } | |
3924 | } | |
3925 | ||
3926 | if (!extent_locked) { | |
3927 | struct btrfs_ordered_extent *ordered; | |
3928 | ||
3929 | btrfs_release_path(root, path); | |
3930 | ||
3931 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
3932 | lock_end, GFP_NOFS); | |
3933 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
3934 | lock_end); | |
3935 | if (ordered && | |
3936 | ordered->file_offset <= lock_end && | |
3937 | ordered->file_offset + ordered->len > lock_start) { | |
3938 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
3939 | lock_start, lock_end, GFP_NOFS); | |
3940 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3941 | btrfs_put_ordered_extent(ordered); | |
3942 | key.offset += num_bytes; | |
3943 | goto skip; | |
3944 | } | |
3945 | if (ordered) | |
3946 | btrfs_put_ordered_extent(ordered); | |
3947 | ||
3948 | mutex_lock(&BTRFS_I(inode)->extent_mutex); | |
3949 | extent_locked = 1; | |
3950 | continue; | |
3951 | } | |
3952 | ||
3953 | if (nr_extents == 1) { | |
3954 | /* update extent pointer in place */ | |
3955 | btrfs_set_file_extent_generation(leaf, fi, | |
3956 | trans->transid); | |
3957 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
3958 | new_extents[0].disk_bytenr); | |
3959 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
3960 | new_extents[0].disk_num_bytes); | |
c8b97818 CM |
3961 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
3962 | new_extents[0].ram_bytes); | |
1a40e23b ZY |
3963 | ext_offset += new_extents[0].offset; |
3964 | btrfs_set_file_extent_offset(leaf, fi, ext_offset); | |
3965 | btrfs_mark_buffer_dirty(leaf); | |
3966 | ||
3967 | btrfs_drop_extent_cache(inode, key.offset, | |
3968 | key.offset + num_bytes - 1, 0); | |
3969 | ||
3970 | ret = btrfs_inc_extent_ref(trans, root, | |
3971 | new_extents[0].disk_bytenr, | |
3972 | new_extents[0].disk_num_bytes, | |
3973 | leaf->start, | |
3974 | root->root_key.objectid, | |
3975 | trans->transid, | |
3bb1a1bc | 3976 | key.objectid); |
1a40e23b ZY |
3977 | BUG_ON(ret); |
3978 | ||
3979 | ret = btrfs_free_extent(trans, root, | |
3980 | extent_key->objectid, | |
3981 | extent_key->offset, | |
3982 | leaf->start, | |
3983 | btrfs_header_owner(leaf), | |
3984 | btrfs_header_generation(leaf), | |
3bb1a1bc | 3985 | key.objectid, 0); |
1a40e23b ZY |
3986 | BUG_ON(ret); |
3987 | ||
3988 | btrfs_release_path(root, path); | |
3989 | key.offset += num_bytes; | |
3990 | } else { | |
3991 | u64 alloc_hint; | |
3992 | u64 extent_len; | |
3993 | int i; | |
3994 | /* | |
3995 | * drop old extent pointer at first, then insert the | |
3996 | * new pointers one bye one | |
3997 | */ | |
3998 | btrfs_release_path(root, path); | |
3999 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
4000 | key.offset + num_bytes, | |
4001 | key.offset, &alloc_hint); | |
4002 | BUG_ON(ret); | |
4003 | ||
4004 | for (i = 0; i < nr_extents; i++) { | |
4005 | if (ext_offset >= new_extents[i].num_bytes) { | |
4006 | ext_offset -= new_extents[i].num_bytes; | |
4007 | continue; | |
4008 | } | |
4009 | extent_len = min(new_extents[i].num_bytes - | |
4010 | ext_offset, num_bytes); | |
4011 | ||
4012 | ret = btrfs_insert_empty_item(trans, root, | |
4013 | path, &key, | |
4014 | sizeof(*fi)); | |
4015 | BUG_ON(ret); | |
4016 | ||
4017 | leaf = path->nodes[0]; | |
4018 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4019 | struct btrfs_file_extent_item); | |
4020 | btrfs_set_file_extent_generation(leaf, fi, | |
4021 | trans->transid); | |
4022 | btrfs_set_file_extent_type(leaf, fi, | |
4023 | BTRFS_FILE_EXTENT_REG); | |
4024 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
4025 | new_extents[i].disk_bytenr); | |
4026 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4027 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
4028 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
4029 | new_extents[i].ram_bytes); | |
4030 | ||
4031 | btrfs_set_file_extent_compression(leaf, fi, | |
4032 | new_extents[i].compression); | |
4033 | btrfs_set_file_extent_encryption(leaf, fi, | |
4034 | new_extents[i].encryption); | |
4035 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
4036 | new_extents[i].other_encoding); | |
4037 | ||
1a40e23b ZY |
4038 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4039 | extent_len); | |
4040 | ext_offset += new_extents[i].offset; | |
4041 | btrfs_set_file_extent_offset(leaf, fi, | |
4042 | ext_offset); | |
4043 | btrfs_mark_buffer_dirty(leaf); | |
4044 | ||
4045 | btrfs_drop_extent_cache(inode, key.offset, | |
4046 | key.offset + extent_len - 1, 0); | |
4047 | ||
4048 | ret = btrfs_inc_extent_ref(trans, root, | |
4049 | new_extents[i].disk_bytenr, | |
4050 | new_extents[i].disk_num_bytes, | |
4051 | leaf->start, | |
4052 | root->root_key.objectid, | |
3bb1a1bc | 4053 | trans->transid, key.objectid); |
1a40e23b ZY |
4054 | BUG_ON(ret); |
4055 | btrfs_release_path(root, path); | |
4056 | ||
a76a3cd4 | 4057 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
4058 | |
4059 | ext_offset = 0; | |
4060 | num_bytes -= extent_len; | |
4061 | key.offset += extent_len; | |
4062 | ||
4063 | if (num_bytes == 0) | |
4064 | break; | |
4065 | } | |
4066 | BUG_ON(i >= nr_extents); | |
4067 | } | |
4068 | ||
4069 | if (extent_locked) { | |
4070 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); | |
4071 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
4072 | lock_end, GFP_NOFS); | |
4073 | extent_locked = 0; | |
4074 | } | |
4075 | skip: | |
4076 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
4077 | key.offset >= first_pos + extent_key->offset) | |
4078 | break; | |
4079 | ||
4080 | cond_resched(); | |
4081 | } | |
4082 | ret = 0; | |
4083 | out: | |
4084 | btrfs_release_path(root, path); | |
4085 | if (inode) { | |
4086 | mutex_unlock(&inode->i_mutex); | |
4087 | if (extent_locked) { | |
4088 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); | |
4089 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
4090 | lock_end, GFP_NOFS); | |
4091 | } | |
4092 | iput(inode); | |
4093 | } | |
4094 | return ret; | |
4095 | } | |
4096 | ||
1a40e23b ZY |
4097 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
4098 | struct btrfs_root *root, | |
4099 | struct extent_buffer *buf, u64 orig_start) | |
4100 | { | |
4101 | int level; | |
4102 | int ret; | |
4103 | ||
4104 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
4105 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
4106 | ||
4107 | level = btrfs_header_level(buf); | |
4108 | if (level == 0) { | |
4109 | struct btrfs_leaf_ref *ref; | |
4110 | struct btrfs_leaf_ref *orig_ref; | |
4111 | ||
4112 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
4113 | if (!orig_ref) | |
4114 | return -ENOENT; | |
4115 | ||
4116 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
4117 | if (!ref) { | |
4118 | btrfs_free_leaf_ref(root, orig_ref); | |
4119 | return -ENOMEM; | |
4120 | } | |
4121 | ||
4122 | ref->nritems = orig_ref->nritems; | |
4123 | memcpy(ref->extents, orig_ref->extents, | |
4124 | sizeof(ref->extents[0]) * ref->nritems); | |
4125 | ||
4126 | btrfs_free_leaf_ref(root, orig_ref); | |
4127 | ||
4128 | ref->root_gen = trans->transid; | |
4129 | ref->bytenr = buf->start; | |
4130 | ref->owner = btrfs_header_owner(buf); | |
4131 | ref->generation = btrfs_header_generation(buf); | |
4132 | ret = btrfs_add_leaf_ref(root, ref, 0); | |
4133 | WARN_ON(ret); | |
4134 | btrfs_free_leaf_ref(root, ref); | |
4135 | } | |
4136 | return 0; | |
4137 | } | |
4138 | ||
4139 | static int noinline invalidate_extent_cache(struct btrfs_root *root, | |
4140 | struct extent_buffer *leaf, | |
4141 | struct btrfs_block_group_cache *group, | |
4142 | struct btrfs_root *target_root) | |
4143 | { | |
4144 | struct btrfs_key key; | |
4145 | struct inode *inode = NULL; | |
4146 | struct btrfs_file_extent_item *fi; | |
4147 | u64 num_bytes; | |
4148 | u64 skip_objectid = 0; | |
4149 | u32 nritems; | |
4150 | u32 i; | |
4151 | ||
4152 | nritems = btrfs_header_nritems(leaf); | |
4153 | for (i = 0; i < nritems; i++) { | |
4154 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4155 | if (key.objectid == skip_objectid || | |
4156 | key.type != BTRFS_EXTENT_DATA_KEY) | |
4157 | continue; | |
4158 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4159 | if (btrfs_file_extent_type(leaf, fi) == | |
4160 | BTRFS_FILE_EXTENT_INLINE) | |
4161 | continue; | |
4162 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
4163 | continue; | |
4164 | if (!inode || inode->i_ino != key.objectid) { | |
4165 | iput(inode); | |
4166 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
4167 | key.objectid, target_root, 1); | |
4168 | } | |
4169 | if (!inode) { | |
4170 | skip_objectid = key.objectid; | |
4171 | continue; | |
4172 | } | |
4173 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4174 | ||
4175 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, | |
4176 | key.offset + num_bytes - 1, GFP_NOFS); | |
4177 | mutex_lock(&BTRFS_I(inode)->extent_mutex); | |
4178 | btrfs_drop_extent_cache(inode, key.offset, | |
4179 | key.offset + num_bytes - 1, 1); | |
4180 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); | |
4181 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, | |
4182 | key.offset + num_bytes - 1, GFP_NOFS); | |
4183 | cond_resched(); | |
4184 | } | |
4185 | iput(inode); | |
4186 | return 0; | |
4187 | } | |
4188 | ||
4189 | static int noinline replace_extents_in_leaf(struct btrfs_trans_handle *trans, | |
4190 | struct btrfs_root *root, | |
4191 | struct extent_buffer *leaf, | |
4192 | struct btrfs_block_group_cache *group, | |
4193 | struct inode *reloc_inode) | |
4194 | { | |
4195 | struct btrfs_key key; | |
4196 | struct btrfs_key extent_key; | |
4197 | struct btrfs_file_extent_item *fi; | |
4198 | struct btrfs_leaf_ref *ref; | |
4199 | struct disk_extent *new_extent; | |
4200 | u64 bytenr; | |
4201 | u64 num_bytes; | |
4202 | u32 nritems; | |
4203 | u32 i; | |
4204 | int ext_index; | |
4205 | int nr_extent; | |
4206 | int ret; | |
4207 | ||
4208 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
4209 | BUG_ON(!new_extent); | |
4210 | ||
4211 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
4212 | BUG_ON(!ref); | |
4213 | ||
4214 | ext_index = -1; | |
4215 | nritems = btrfs_header_nritems(leaf); | |
4216 | for (i = 0; i < nritems; i++) { | |
4217 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4218 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
4219 | continue; | |
4220 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4221 | if (btrfs_file_extent_type(leaf, fi) == | |
4222 | BTRFS_FILE_EXTENT_INLINE) | |
4223 | continue; | |
4224 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
4225 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4226 | if (bytenr == 0) | |
4227 | continue; | |
4228 | ||
4229 | ext_index++; | |
4230 | if (bytenr >= group->key.objectid + group->key.offset || | |
4231 | bytenr + num_bytes <= group->key.objectid) | |
4232 | continue; | |
4233 | ||
4234 | extent_key.objectid = bytenr; | |
4235 | extent_key.offset = num_bytes; | |
4236 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
4237 | nr_extent = 1; | |
4238 | ret = get_new_locations(reloc_inode, &extent_key, | |
4239 | group->key.objectid, 1, | |
4240 | &new_extent, &nr_extent); | |
4241 | if (ret > 0) | |
4242 | continue; | |
4243 | BUG_ON(ret < 0); | |
4244 | ||
4245 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
4246 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
4247 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
4248 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
4249 | ||
4250 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); | |
c8b97818 CM |
4251 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
4252 | new_extent->ram_bytes); | |
1a40e23b ZY |
4253 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4254 | new_extent->disk_bytenr); | |
4255 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4256 | new_extent->disk_num_bytes); | |
4257 | new_extent->offset += btrfs_file_extent_offset(leaf, fi); | |
4258 | btrfs_set_file_extent_offset(leaf, fi, new_extent->offset); | |
4259 | btrfs_mark_buffer_dirty(leaf); | |
4260 | ||
4261 | ret = btrfs_inc_extent_ref(trans, root, | |
4262 | new_extent->disk_bytenr, | |
4263 | new_extent->disk_num_bytes, | |
4264 | leaf->start, | |
4265 | root->root_key.objectid, | |
3bb1a1bc | 4266 | trans->transid, key.objectid); |
1a40e23b ZY |
4267 | BUG_ON(ret); |
4268 | ret = btrfs_free_extent(trans, root, | |
4269 | bytenr, num_bytes, leaf->start, | |
4270 | btrfs_header_owner(leaf), | |
4271 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4272 | key.objectid, 0); |
1a40e23b ZY |
4273 | BUG_ON(ret); |
4274 | cond_resched(); | |
4275 | } | |
4276 | kfree(new_extent); | |
4277 | BUG_ON(ext_index + 1 != ref->nritems); | |
4278 | btrfs_free_leaf_ref(root, ref); | |
4279 | return 0; | |
4280 | } | |
4281 | ||
f82d02d9 YZ |
4282 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
4283 | struct btrfs_root *root) | |
1a40e23b ZY |
4284 | { |
4285 | struct btrfs_root *reloc_root; | |
f82d02d9 | 4286 | int ret; |
1a40e23b ZY |
4287 | |
4288 | if (root->reloc_root) { | |
4289 | reloc_root = root->reloc_root; | |
4290 | root->reloc_root = NULL; | |
4291 | list_add(&reloc_root->dead_list, | |
4292 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
4293 | |
4294 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
4295 | reloc_root->node->start); | |
4296 | btrfs_set_root_level(&root->root_item, | |
4297 | btrfs_header_level(reloc_root->node)); | |
4298 | memset(&reloc_root->root_item.drop_progress, 0, | |
4299 | sizeof(struct btrfs_disk_key)); | |
4300 | reloc_root->root_item.drop_level = 0; | |
4301 | ||
4302 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4303 | &reloc_root->root_key, | |
4304 | &reloc_root->root_item); | |
4305 | BUG_ON(ret); | |
1a40e23b ZY |
4306 | } |
4307 | return 0; | |
4308 | } | |
4309 | ||
4310 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
4311 | { | |
4312 | struct btrfs_trans_handle *trans; | |
4313 | struct btrfs_root *reloc_root; | |
4314 | struct btrfs_root *prev_root = NULL; | |
4315 | struct list_head dead_roots; | |
4316 | int ret; | |
4317 | unsigned long nr; | |
4318 | ||
4319 | INIT_LIST_HEAD(&dead_roots); | |
4320 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
4321 | ||
4322 | while (!list_empty(&dead_roots)) { | |
4323 | reloc_root = list_entry(dead_roots.prev, | |
4324 | struct btrfs_root, dead_list); | |
4325 | list_del_init(&reloc_root->dead_list); | |
4326 | ||
4327 | BUG_ON(reloc_root->commit_root != NULL); | |
4328 | while (1) { | |
4329 | trans = btrfs_join_transaction(root, 1); | |
4330 | BUG_ON(!trans); | |
4331 | ||
4332 | mutex_lock(&root->fs_info->drop_mutex); | |
4333 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
4334 | if (ret != -EAGAIN) | |
4335 | break; | |
4336 | mutex_unlock(&root->fs_info->drop_mutex); | |
4337 | ||
4338 | nr = trans->blocks_used; | |
4339 | ret = btrfs_end_transaction(trans, root); | |
4340 | BUG_ON(ret); | |
4341 | btrfs_btree_balance_dirty(root, nr); | |
4342 | } | |
4343 | ||
4344 | free_extent_buffer(reloc_root->node); | |
4345 | ||
4346 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
4347 | &reloc_root->root_key); | |
4348 | BUG_ON(ret); | |
4349 | mutex_unlock(&root->fs_info->drop_mutex); | |
4350 | ||
4351 | nr = trans->blocks_used; | |
4352 | ret = btrfs_end_transaction(trans, root); | |
4353 | BUG_ON(ret); | |
4354 | btrfs_btree_balance_dirty(root, nr); | |
4355 | ||
4356 | kfree(prev_root); | |
4357 | prev_root = reloc_root; | |
4358 | } | |
4359 | if (prev_root) { | |
4360 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
4361 | kfree(prev_root); | |
4362 | } | |
4363 | return 0; | |
4364 | } | |
4365 | ||
4366 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
4367 | { | |
4368 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
4369 | return 0; | |
4370 | } | |
4371 | ||
4372 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
4373 | { | |
4374 | struct btrfs_root *reloc_root; | |
4375 | struct btrfs_trans_handle *trans; | |
4376 | struct btrfs_key location; | |
4377 | int found; | |
4378 | int ret; | |
4379 | ||
4380 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
4381 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
4382 | BUG_ON(ret); | |
4383 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
4384 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
4385 | ||
4386 | if (found) { | |
4387 | trans = btrfs_start_transaction(root, 1); | |
4388 | BUG_ON(!trans); | |
4389 | ret = btrfs_commit_transaction(trans, root); | |
4390 | BUG_ON(ret); | |
4391 | } | |
4392 | ||
4393 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
4394 | location.offset = (u64)-1; | |
4395 | location.type = BTRFS_ROOT_ITEM_KEY; | |
4396 | ||
4397 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
4398 | BUG_ON(!reloc_root); | |
4399 | btrfs_orphan_cleanup(reloc_root); | |
4400 | return 0; | |
4401 | } | |
4402 | ||
4403 | static int noinline init_reloc_tree(struct btrfs_trans_handle *trans, | |
4404 | struct btrfs_root *root) | |
4405 | { | |
4406 | struct btrfs_root *reloc_root; | |
4407 | struct extent_buffer *eb; | |
4408 | struct btrfs_root_item *root_item; | |
4409 | struct btrfs_key root_key; | |
4410 | int ret; | |
4411 | ||
4412 | BUG_ON(!root->ref_cows); | |
4413 | if (root->reloc_root) | |
4414 | return 0; | |
4415 | ||
4416 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
4417 | BUG_ON(!root_item); | |
4418 | ||
4419 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
4420 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
4421 | BUG_ON(ret); | |
4422 | ||
4423 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
4424 | root_key.offset = root->root_key.objectid; | |
4425 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
4426 | ||
4427 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
4428 | btrfs_set_root_refs(root_item, 0); | |
4429 | btrfs_set_root_bytenr(root_item, eb->start); | |
4430 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 4431 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
4432 | |
4433 | btrfs_tree_unlock(eb); | |
4434 | free_extent_buffer(eb); | |
4435 | ||
4436 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
4437 | &root_key, root_item); | |
4438 | BUG_ON(ret); | |
4439 | kfree(root_item); | |
4440 | ||
4441 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
4442 | &root_key); | |
4443 | BUG_ON(!reloc_root); | |
4444 | reloc_root->last_trans = trans->transid; | |
4445 | reloc_root->commit_root = NULL; | |
4446 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
4447 | ||
4448 | root->reloc_root = reloc_root; | |
4449 | return 0; | |
4450 | } | |
4451 | ||
4452 | /* | |
4453 | * Core function of space balance. | |
4454 | * | |
4455 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
4456 | * counted roots. There is one reloc tree for each subvol, and all |
4457 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
4458 | * of the latest committed roots of subvols (root->commit_root). | |
4459 | * | |
4460 | * To relocate a tree block referenced by a subvol, there are two steps. | |
4461 | * COW the block through subvol's reloc tree, then update block pointer | |
4462 | * in the subvol to point to the new block. Since all reloc trees share | |
4463 | * same root key objectid, doing special handing for tree blocks owned | |
4464 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
4465 | * we can use the resulting new block directly when the same block is | |
4466 | * required to COW again through other reloc trees. By this way, relocated | |
4467 | * tree blocks are shared between reloc trees, so they are also shared | |
4468 | * between subvols. | |
1a40e23b ZY |
4469 | */ |
4470 | static int noinline relocate_one_path(struct btrfs_trans_handle *trans, | |
4471 | struct btrfs_root *root, | |
4472 | struct btrfs_path *path, | |
4473 | struct btrfs_key *first_key, | |
4474 | struct btrfs_ref_path *ref_path, | |
4475 | struct btrfs_block_group_cache *group, | |
4476 | struct inode *reloc_inode) | |
4477 | { | |
4478 | struct btrfs_root *reloc_root; | |
4479 | struct extent_buffer *eb = NULL; | |
4480 | struct btrfs_key *keys; | |
4481 | u64 *nodes; | |
4482 | int level; | |
f82d02d9 | 4483 | int shared_level; |
1a40e23b | 4484 | int lowest_level = 0; |
1a40e23b ZY |
4485 | int ret; |
4486 | ||
4487 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
4488 | lowest_level = ref_path->owner_objectid; | |
4489 | ||
f82d02d9 | 4490 | if (!root->ref_cows) { |
1a40e23b ZY |
4491 | path->lowest_level = lowest_level; |
4492 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
4493 | BUG_ON(ret < 0); | |
4494 | path->lowest_level = 0; | |
4495 | btrfs_release_path(root, path); | |
4496 | return 0; | |
4497 | } | |
4498 | ||
1a40e23b ZY |
4499 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
4500 | ret = init_reloc_tree(trans, root); | |
4501 | BUG_ON(ret); | |
4502 | reloc_root = root->reloc_root; | |
4503 | ||
f82d02d9 YZ |
4504 | shared_level = ref_path->shared_level; |
4505 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 4506 | |
f82d02d9 YZ |
4507 | keys = ref_path->node_keys; |
4508 | nodes = ref_path->new_nodes; | |
4509 | memset(&keys[shared_level + 1], 0, | |
4510 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
4511 | memset(&nodes[shared_level + 1], 0, | |
4512 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 4513 | |
f82d02d9 YZ |
4514 | if (nodes[lowest_level] == 0) { |
4515 | path->lowest_level = lowest_level; | |
4516 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
4517 | 0, 1); | |
4518 | BUG_ON(ret); | |
4519 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
4520 | eb = path->nodes[level]; | |
4521 | if (!eb || eb == reloc_root->node) | |
4522 | break; | |
4523 | nodes[level] = eb->start; | |
4524 | if (level == 0) | |
4525 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
4526 | else | |
4527 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
4528 | } | |
4529 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
4530 | eb = path->nodes[0]; | |
4531 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
4532 | group, reloc_inode); | |
4533 | BUG_ON(ret); | |
4534 | } | |
4535 | btrfs_release_path(reloc_root, path); | |
4536 | } else { | |
1a40e23b | 4537 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 4538 | lowest_level); |
1a40e23b ZY |
4539 | BUG_ON(ret); |
4540 | } | |
4541 | ||
1a40e23b ZY |
4542 | /* |
4543 | * replace tree blocks in the fs tree with tree blocks in | |
4544 | * the reloc tree. | |
4545 | */ | |
4546 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
4547 | BUG_ON(ret < 0); | |
4548 | ||
4549 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
4550 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
4551 | 0, 0); | |
4552 | BUG_ON(ret); | |
4553 | extent_buffer_get(path->nodes[0]); | |
4554 | eb = path->nodes[0]; | |
4555 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
4556 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
4557 | BUG_ON(ret); | |
4558 | free_extent_buffer(eb); | |
4559 | } | |
1a40e23b | 4560 | |
f82d02d9 | 4561 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 4562 | path->lowest_level = 0; |
1a40e23b ZY |
4563 | return 0; |
4564 | } | |
4565 | ||
4566 | static int noinline relocate_tree_block(struct btrfs_trans_handle *trans, | |
4567 | struct btrfs_root *root, | |
4568 | struct btrfs_path *path, | |
4569 | struct btrfs_key *first_key, | |
4570 | struct btrfs_ref_path *ref_path) | |
4571 | { | |
4572 | int ret; | |
1a40e23b ZY |
4573 | |
4574 | ret = relocate_one_path(trans, root, path, first_key, | |
4575 | ref_path, NULL, NULL); | |
4576 | BUG_ON(ret); | |
4577 | ||
4578 | if (root == root->fs_info->extent_root) | |
4579 | btrfs_extent_post_op(trans, root); | |
1a40e23b ZY |
4580 | |
4581 | return 0; | |
4582 | } | |
4583 | ||
4584 | static int noinline del_extent_zero(struct btrfs_trans_handle *trans, | |
4585 | struct btrfs_root *extent_root, | |
4586 | struct btrfs_path *path, | |
4587 | struct btrfs_key *extent_key) | |
4588 | { | |
4589 | int ret; | |
4590 | ||
1a40e23b ZY |
4591 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
4592 | if (ret) | |
4593 | goto out; | |
4594 | ret = btrfs_del_item(trans, extent_root, path); | |
4595 | out: | |
4596 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
4597 | return ret; |
4598 | } | |
4599 | ||
4600 | static struct btrfs_root noinline *read_ref_root(struct btrfs_fs_info *fs_info, | |
4601 | struct btrfs_ref_path *ref_path) | |
4602 | { | |
4603 | struct btrfs_key root_key; | |
4604 | ||
4605 | root_key.objectid = ref_path->root_objectid; | |
4606 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
4607 | if (is_cowonly_root(ref_path->root_objectid)) | |
4608 | root_key.offset = 0; | |
4609 | else | |
4610 | root_key.offset = (u64)-1; | |
4611 | ||
4612 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
4613 | } | |
4614 | ||
4615 | static int noinline relocate_one_extent(struct btrfs_root *extent_root, | |
4616 | struct btrfs_path *path, | |
4617 | struct btrfs_key *extent_key, | |
4618 | struct btrfs_block_group_cache *group, | |
4619 | struct inode *reloc_inode, int pass) | |
4620 | { | |
4621 | struct btrfs_trans_handle *trans; | |
4622 | struct btrfs_root *found_root; | |
4623 | struct btrfs_ref_path *ref_path = NULL; | |
4624 | struct disk_extent *new_extents = NULL; | |
4625 | int nr_extents = 0; | |
4626 | int loops; | |
4627 | int ret; | |
4628 | int level; | |
4629 | struct btrfs_key first_key; | |
4630 | u64 prev_block = 0; | |
4631 | ||
1a40e23b ZY |
4632 | |
4633 | trans = btrfs_start_transaction(extent_root, 1); | |
4634 | BUG_ON(!trans); | |
4635 | ||
4636 | if (extent_key->objectid == 0) { | |
4637 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
4638 | goto out; | |
4639 | } | |
4640 | ||
4641 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
4642 | if (!ref_path) { | |
4643 | ret = -ENOMEM; | |
4644 | goto out; | |
4645 | } | |
4646 | ||
4647 | for (loops = 0; ; loops++) { | |
4648 | if (loops == 0) { | |
4649 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
4650 | extent_key->objectid); | |
4651 | } else { | |
4652 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
4653 | } | |
4654 | if (ret < 0) | |
4655 | goto out; | |
4656 | if (ret > 0) | |
4657 | break; | |
4658 | ||
4659 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
4660 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
4661 | continue; | |
4662 | ||
4663 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
4664 | BUG_ON(!found_root); | |
4665 | /* | |
4666 | * for reference counted tree, only process reference paths | |
4667 | * rooted at the latest committed root. | |
4668 | */ | |
4669 | if (found_root->ref_cows && | |
4670 | ref_path->root_generation != found_root->root_key.offset) | |
4671 | continue; | |
4672 | ||
4673 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
4674 | if (pass == 0) { | |
4675 | /* | |
4676 | * copy data extents to new locations | |
4677 | */ | |
4678 | u64 group_start = group->key.objectid; | |
4679 | ret = relocate_data_extent(reloc_inode, | |
4680 | extent_key, | |
4681 | group_start); | |
4682 | if (ret < 0) | |
4683 | goto out; | |
4684 | break; | |
4685 | } | |
4686 | level = 0; | |
4687 | } else { | |
4688 | level = ref_path->owner_objectid; | |
4689 | } | |
4690 | ||
4691 | if (prev_block != ref_path->nodes[level]) { | |
4692 | struct extent_buffer *eb; | |
4693 | u64 block_start = ref_path->nodes[level]; | |
4694 | u64 block_size = btrfs_level_size(found_root, level); | |
4695 | ||
4696 | eb = read_tree_block(found_root, block_start, | |
4697 | block_size, 0); | |
4698 | btrfs_tree_lock(eb); | |
4699 | BUG_ON(level != btrfs_header_level(eb)); | |
4700 | ||
4701 | if (level == 0) | |
4702 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
4703 | else | |
4704 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
4705 | ||
4706 | btrfs_tree_unlock(eb); | |
4707 | free_extent_buffer(eb); | |
4708 | prev_block = block_start; | |
4709 | } | |
4710 | ||
4711 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID && | |
4712 | pass >= 2) { | |
4713 | /* | |
4714 | * use fallback method to process the remaining | |
4715 | * references. | |
4716 | */ | |
4717 | if (!new_extents) { | |
4718 | u64 group_start = group->key.objectid; | |
4719 | ret = get_new_locations(reloc_inode, | |
4720 | extent_key, | |
4721 | group_start, 0, | |
4722 | &new_extents, | |
4723 | &nr_extents); | |
4724 | if (ret < 0) | |
4725 | goto out; | |
4726 | } | |
4727 | btrfs_record_root_in_trans(found_root); | |
4728 | ret = replace_one_extent(trans, found_root, | |
4729 | path, extent_key, | |
4730 | &first_key, ref_path, | |
4731 | new_extents, nr_extents); | |
4732 | if (ret < 0) | |
4733 | goto out; | |
4734 | continue; | |
4735 | } | |
4736 | ||
4737 | btrfs_record_root_in_trans(found_root); | |
4738 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
4739 | ret = relocate_tree_block(trans, found_root, path, | |
4740 | &first_key, ref_path); | |
4741 | } else { | |
4742 | /* | |
4743 | * try to update data extent references while | |
4744 | * keeping metadata shared between snapshots. | |
4745 | */ | |
4746 | ret = relocate_one_path(trans, found_root, path, | |
4747 | &first_key, ref_path, | |
4748 | group, reloc_inode); | |
4749 | } | |
4750 | if (ret < 0) | |
4751 | goto out; | |
4752 | } | |
4753 | ret = 0; | |
4754 | out: | |
4755 | btrfs_end_transaction(trans, extent_root); | |
4756 | kfree(new_extents); | |
4757 | kfree(ref_path); | |
1a40e23b ZY |
4758 | return ret; |
4759 | } | |
4760 | ||
ec44a35c CM |
4761 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
4762 | { | |
4763 | u64 num_devices; | |
4764 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
4765 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
4766 | ||
a061fc8d | 4767 | num_devices = root->fs_info->fs_devices->num_devices; |
ec44a35c CM |
4768 | if (num_devices == 1) { |
4769 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
4770 | stripped = flags & ~stripped; | |
4771 | ||
4772 | /* turn raid0 into single device chunks */ | |
4773 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
4774 | return stripped; | |
4775 | ||
4776 | /* turn mirroring into duplication */ | |
4777 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
4778 | BTRFS_BLOCK_GROUP_RAID10)) | |
4779 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
4780 | return flags; | |
4781 | } else { | |
4782 | /* they already had raid on here, just return */ | |
ec44a35c CM |
4783 | if (flags & stripped) |
4784 | return flags; | |
4785 | ||
4786 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
4787 | stripped = flags & ~stripped; | |
4788 | ||
4789 | /* switch duplicated blocks with raid1 */ | |
4790 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
4791 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
4792 | ||
4793 | /* turn single device chunks into raid0 */ | |
4794 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
4795 | } | |
4796 | return flags; | |
4797 | } | |
4798 | ||
0ef3e66b CM |
4799 | int __alloc_chunk_for_shrink(struct btrfs_root *root, |
4800 | struct btrfs_block_group_cache *shrink_block_group, | |
4801 | int force) | |
4802 | { | |
4803 | struct btrfs_trans_handle *trans; | |
4804 | u64 new_alloc_flags; | |
4805 | u64 calc; | |
4806 | ||
c286ac48 | 4807 | spin_lock(&shrink_block_group->lock); |
0ef3e66b | 4808 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
c286ac48 | 4809 | spin_unlock(&shrink_block_group->lock); |
c286ac48 | 4810 | |
0ef3e66b | 4811 | trans = btrfs_start_transaction(root, 1); |
c286ac48 | 4812 | spin_lock(&shrink_block_group->lock); |
7d9eb12c | 4813 | |
0ef3e66b CM |
4814 | new_alloc_flags = update_block_group_flags(root, |
4815 | shrink_block_group->flags); | |
4816 | if (new_alloc_flags != shrink_block_group->flags) { | |
4817 | calc = | |
4818 | btrfs_block_group_used(&shrink_block_group->item); | |
4819 | } else { | |
4820 | calc = shrink_block_group->key.offset; | |
4821 | } | |
c286ac48 CM |
4822 | spin_unlock(&shrink_block_group->lock); |
4823 | ||
0ef3e66b CM |
4824 | do_chunk_alloc(trans, root->fs_info->extent_root, |
4825 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
7d9eb12c | 4826 | |
0ef3e66b | 4827 | btrfs_end_transaction(trans, root); |
c286ac48 CM |
4828 | } else |
4829 | spin_unlock(&shrink_block_group->lock); | |
0ef3e66b CM |
4830 | return 0; |
4831 | } | |
4832 | ||
1a40e23b ZY |
4833 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
4834 | struct btrfs_root *root, | |
4835 | u64 objectid, u64 size) | |
4836 | { | |
4837 | struct btrfs_path *path; | |
4838 | struct btrfs_inode_item *item; | |
4839 | struct extent_buffer *leaf; | |
4840 | int ret; | |
4841 | ||
4842 | path = btrfs_alloc_path(); | |
4843 | if (!path) | |
4844 | return -ENOMEM; | |
4845 | ||
4846 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); | |
4847 | if (ret) | |
4848 | goto out; | |
4849 | ||
4850 | leaf = path->nodes[0]; | |
4851 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); | |
4852 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
4853 | btrfs_set_inode_generation(leaf, item, 1); | |
4854 | btrfs_set_inode_size(leaf, item, size); | |
4855 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); | |
4856 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NODATASUM); | |
4857 | btrfs_mark_buffer_dirty(leaf); | |
4858 | btrfs_release_path(root, path); | |
4859 | out: | |
4860 | btrfs_free_path(path); | |
4861 | return ret; | |
4862 | } | |
4863 | ||
4864 | static struct inode noinline *create_reloc_inode(struct btrfs_fs_info *fs_info, | |
4865 | struct btrfs_block_group_cache *group) | |
4866 | { | |
4867 | struct inode *inode = NULL; | |
4868 | struct btrfs_trans_handle *trans; | |
4869 | struct btrfs_root *root; | |
4870 | struct btrfs_key root_key; | |
4871 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; | |
4872 | int err = 0; | |
4873 | ||
4874 | root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
4875 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
4876 | root_key.offset = (u64)-1; | |
4877 | root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
4878 | if (IS_ERR(root)) | |
4879 | return ERR_CAST(root); | |
4880 | ||
4881 | trans = btrfs_start_transaction(root, 1); | |
4882 | BUG_ON(!trans); | |
4883 | ||
4884 | err = btrfs_find_free_objectid(trans, root, objectid, &objectid); | |
4885 | if (err) | |
4886 | goto out; | |
4887 | ||
4888 | err = __insert_orphan_inode(trans, root, objectid, group->key.offset); | |
4889 | BUG_ON(err); | |
4890 | ||
4891 | err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, | |
c8b97818 CM |
4892 | group->key.offset, 0, group->key.offset, |
4893 | 0, 0, 0); | |
1a40e23b ZY |
4894 | BUG_ON(err); |
4895 | ||
4896 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); | |
4897 | if (inode->i_state & I_NEW) { | |
4898 | BTRFS_I(inode)->root = root; | |
4899 | BTRFS_I(inode)->location.objectid = objectid; | |
4900 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
4901 | BTRFS_I(inode)->location.offset = 0; | |
4902 | btrfs_read_locked_inode(inode); | |
4903 | unlock_new_inode(inode); | |
4904 | BUG_ON(is_bad_inode(inode)); | |
4905 | } else { | |
4906 | BUG_ON(1); | |
4907 | } | |
4908 | ||
4909 | err = btrfs_orphan_add(trans, inode); | |
4910 | out: | |
4911 | btrfs_end_transaction(trans, root); | |
4912 | if (err) { | |
4913 | if (inode) | |
4914 | iput(inode); | |
4915 | inode = ERR_PTR(err); | |
4916 | } | |
4917 | return inode; | |
4918 | } | |
4919 | ||
4920 | int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start) | |
edbd8d4e CM |
4921 | { |
4922 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 4923 | struct btrfs_path *path; |
1a40e23b ZY |
4924 | struct btrfs_fs_info *info = root->fs_info; |
4925 | struct extent_buffer *leaf; | |
4926 | struct inode *reloc_inode; | |
4927 | struct btrfs_block_group_cache *block_group; | |
4928 | struct btrfs_key key; | |
edbd8d4e CM |
4929 | u64 cur_byte; |
4930 | u64 total_found; | |
edbd8d4e CM |
4931 | u32 nritems; |
4932 | int ret; | |
a061fc8d | 4933 | int progress; |
1a40e23b | 4934 | int pass = 0; |
edbd8d4e | 4935 | |
1a40e23b ZY |
4936 | root = root->fs_info->extent_root; |
4937 | ||
4938 | block_group = btrfs_lookup_block_group(info, group_start); | |
4939 | BUG_ON(!block_group); | |
8f18cf13 | 4940 | |
1a40e23b ZY |
4941 | printk("btrfs relocating block group %llu flags %llu\n", |
4942 | (unsigned long long)block_group->key.objectid, | |
4943 | (unsigned long long)block_group->flags); | |
8f18cf13 | 4944 | |
edbd8d4e | 4945 | path = btrfs_alloc_path(); |
1a40e23b | 4946 | BUG_ON(!path); |
edbd8d4e | 4947 | |
1a40e23b ZY |
4948 | reloc_inode = create_reloc_inode(info, block_group); |
4949 | BUG_ON(IS_ERR(reloc_inode)); | |
323da79c | 4950 | |
1a40e23b ZY |
4951 | __alloc_chunk_for_shrink(root, block_group, 1); |
4952 | block_group->ro = 1; | |
4953 | block_group->space_info->total_bytes -= block_group->key.offset; | |
323da79c | 4954 | |
1a40e23b ZY |
4955 | btrfs_start_delalloc_inodes(info->tree_root); |
4956 | btrfs_wait_ordered_extents(info->tree_root, 0); | |
4957 | again: | |
edbd8d4e | 4958 | total_found = 0; |
a061fc8d | 4959 | progress = 0; |
1a40e23b | 4960 | key.objectid = block_group->key.objectid; |
edbd8d4e CM |
4961 | key.offset = 0; |
4962 | key.type = 0; | |
73e48b27 | 4963 | cur_byte = key.objectid; |
4313b399 | 4964 | |
1a40e23b ZY |
4965 | trans = btrfs_start_transaction(info->tree_root, 1); |
4966 | btrfs_commit_transaction(trans, info->tree_root); | |
ea8c2819 | 4967 | |
1a40e23b ZY |
4968 | mutex_lock(&root->fs_info->cleaner_mutex); |
4969 | btrfs_clean_old_snapshots(info->tree_root); | |
4970 | btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1); | |
4971 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
ea8c2819 | 4972 | |
73e48b27 | 4973 | while(1) { |
edbd8d4e CM |
4974 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
4975 | if (ret < 0) | |
4976 | goto out; | |
7d9eb12c | 4977 | next: |
edbd8d4e | 4978 | leaf = path->nodes[0]; |
73e48b27 | 4979 | nritems = btrfs_header_nritems(leaf); |
73e48b27 Y |
4980 | if (path->slots[0] >= nritems) { |
4981 | ret = btrfs_next_leaf(root, path); | |
4982 | if (ret < 0) | |
4983 | goto out; | |
4984 | if (ret == 1) { | |
4985 | ret = 0; | |
4986 | break; | |
edbd8d4e | 4987 | } |
73e48b27 Y |
4988 | leaf = path->nodes[0]; |
4989 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 4990 | } |
73e48b27 | 4991 | |
1a40e23b | 4992 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
725c8463 | 4993 | |
1a40e23b ZY |
4994 | if (key.objectid >= block_group->key.objectid + |
4995 | block_group->key.offset) | |
8f18cf13 CM |
4996 | break; |
4997 | ||
725c8463 | 4998 | if (progress && need_resched()) { |
725c8463 | 4999 | btrfs_release_path(root, path); |
1a40e23b | 5000 | cond_resched(); |
725c8463 | 5001 | progress = 0; |
1a40e23b | 5002 | continue; |
725c8463 CM |
5003 | } |
5004 | progress = 1; | |
5005 | ||
1a40e23b ZY |
5006 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY || |
5007 | key.objectid + key.offset <= cur_byte) { | |
edbd8d4e | 5008 | path->slots[0]++; |
edbd8d4e CM |
5009 | goto next; |
5010 | } | |
73e48b27 | 5011 | |
edbd8d4e | 5012 | total_found++; |
1a40e23b | 5013 | cur_byte = key.objectid + key.offset; |
edbd8d4e | 5014 | btrfs_release_path(root, path); |
edbd8d4e | 5015 | |
1a40e23b ZY |
5016 | __alloc_chunk_for_shrink(root, block_group, 0); |
5017 | ret = relocate_one_extent(root, path, &key, block_group, | |
5018 | reloc_inode, pass); | |
5019 | BUG_ON(ret < 0); | |
edbd8d4e | 5020 | |
1a40e23b ZY |
5021 | key.objectid = cur_byte; |
5022 | key.type = 0; | |
5023 | key.offset = 0; | |
edbd8d4e CM |
5024 | } |
5025 | ||
1a40e23b | 5026 | btrfs_release_path(root, path); |
7d9eb12c | 5027 | |
1a40e23b ZY |
5028 | if (pass == 0) { |
5029 | btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1); | |
5030 | invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1); | |
5031 | WARN_ON(reloc_inode->i_mapping->nrpages); | |
8e8a1e31 | 5032 | } |
73e48b27 | 5033 | |
1a40e23b ZY |
5034 | if (total_found > 0) { |
5035 | printk("btrfs found %llu extents in pass %d\n", | |
5036 | (unsigned long long)total_found, pass); | |
5037 | pass++; | |
5038 | goto again; | |
0f9dd46c | 5039 | } |
0ef3e66b | 5040 | |
1a40e23b ZY |
5041 | /* delete reloc_inode */ |
5042 | iput(reloc_inode); | |
5043 | ||
5044 | /* unpin extents in this range */ | |
5045 | trans = btrfs_start_transaction(info->tree_root, 1); | |
5046 | btrfs_commit_transaction(trans, info->tree_root); | |
0ef3e66b | 5047 | |
1a40e23b ZY |
5048 | spin_lock(&block_group->lock); |
5049 | WARN_ON(block_group->pinned > 0); | |
5050 | WARN_ON(block_group->reserved > 0); | |
5051 | WARN_ON(btrfs_block_group_used(&block_group->item) > 0); | |
5052 | spin_unlock(&block_group->lock); | |
5053 | ret = 0; | |
edbd8d4e | 5054 | out: |
1a40e23b | 5055 | btrfs_free_path(path); |
edbd8d4e CM |
5056 | return ret; |
5057 | } | |
5058 | ||
0b86a832 CM |
5059 | int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path, |
5060 | struct btrfs_key *key) | |
5061 | { | |
925baedd | 5062 | int ret = 0; |
0b86a832 CM |
5063 | struct btrfs_key found_key; |
5064 | struct extent_buffer *leaf; | |
5065 | int slot; | |
edbd8d4e | 5066 | |
0b86a832 CM |
5067 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
5068 | if (ret < 0) | |
925baedd CM |
5069 | goto out; |
5070 | ||
0b86a832 CM |
5071 | while(1) { |
5072 | slot = path->slots[0]; | |
edbd8d4e | 5073 | leaf = path->nodes[0]; |
0b86a832 CM |
5074 | if (slot >= btrfs_header_nritems(leaf)) { |
5075 | ret = btrfs_next_leaf(root, path); | |
5076 | if (ret == 0) | |
5077 | continue; | |
5078 | if (ret < 0) | |
925baedd | 5079 | goto out; |
0b86a832 | 5080 | break; |
edbd8d4e | 5081 | } |
0b86a832 | 5082 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 5083 | |
0b86a832 | 5084 | if (found_key.objectid >= key->objectid && |
925baedd CM |
5085 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5086 | ret = 0; | |
5087 | goto out; | |
5088 | } | |
0b86a832 | 5089 | path->slots[0]++; |
edbd8d4e | 5090 | } |
0b86a832 | 5091 | ret = -ENOENT; |
925baedd | 5092 | out: |
0b86a832 | 5093 | return ret; |
edbd8d4e CM |
5094 | } |
5095 | ||
1a40e23b ZY |
5096 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
5097 | { | |
5098 | struct btrfs_block_group_cache *block_group; | |
5099 | struct rb_node *n; | |
5100 | ||
1a40e23b ZY |
5101 | spin_lock(&info->block_group_cache_lock); |
5102 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
5103 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
5104 | cache_node); | |
5105 | ||
5106 | spin_unlock(&info->block_group_cache_lock); | |
5107 | btrfs_remove_free_space_cache(block_group); | |
5108 | spin_lock(&info->block_group_cache_lock); | |
5109 | ||
5110 | rb_erase(&block_group->cache_node, | |
5111 | &info->block_group_cache_tree); | |
80eb234a | 5112 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5113 | list_del(&block_group->list); |
80eb234a | 5114 | up_write(&block_group->space_info->groups_sem); |
1a40e23b ZY |
5115 | kfree(block_group); |
5116 | } | |
5117 | spin_unlock(&info->block_group_cache_lock); | |
1a40e23b ZY |
5118 | return 0; |
5119 | } | |
5120 | ||
9078a3e1 CM |
5121 | int btrfs_read_block_groups(struct btrfs_root *root) |
5122 | { | |
5123 | struct btrfs_path *path; | |
5124 | int ret; | |
9078a3e1 | 5125 | struct btrfs_block_group_cache *cache; |
be744175 | 5126 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 5127 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
5128 | struct btrfs_key key; |
5129 | struct btrfs_key found_key; | |
5f39d397 | 5130 | struct extent_buffer *leaf; |
96b5179d | 5131 | |
be744175 | 5132 | root = info->extent_root; |
9078a3e1 | 5133 | key.objectid = 0; |
0b86a832 | 5134 | key.offset = 0; |
9078a3e1 | 5135 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
5136 | path = btrfs_alloc_path(); |
5137 | if (!path) | |
5138 | return -ENOMEM; | |
5139 | ||
5140 | while(1) { | |
0b86a832 CM |
5141 | ret = find_first_block_group(root, path, &key); |
5142 | if (ret > 0) { | |
5143 | ret = 0; | |
5144 | goto error; | |
9078a3e1 | 5145 | } |
0b86a832 CM |
5146 | if (ret != 0) |
5147 | goto error; | |
5148 | ||
5f39d397 CM |
5149 | leaf = path->nodes[0]; |
5150 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 5151 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 5152 | if (!cache) { |
0b86a832 | 5153 | ret = -ENOMEM; |
9078a3e1 CM |
5154 | break; |
5155 | } | |
3e1ad54f | 5156 | |
c286ac48 | 5157 | spin_lock_init(&cache->lock); |
25179201 | 5158 | mutex_init(&cache->alloc_mutex); |
0f9dd46c | 5159 | INIT_LIST_HEAD(&cache->list); |
5f39d397 CM |
5160 | read_extent_buffer(leaf, &cache->item, |
5161 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
5162 | sizeof(cache->item)); | |
9078a3e1 | 5163 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 5164 | |
9078a3e1 CM |
5165 | key.objectid = found_key.objectid + found_key.offset; |
5166 | btrfs_release_path(root, path); | |
0b86a832 | 5167 | cache->flags = btrfs_block_group_flags(&cache->item); |
96b5179d | 5168 | |
6324fbf3 CM |
5169 | ret = update_space_info(info, cache->flags, found_key.offset, |
5170 | btrfs_block_group_used(&cache->item), | |
5171 | &space_info); | |
5172 | BUG_ON(ret); | |
5173 | cache->space_info = space_info; | |
80eb234a JB |
5174 | down_write(&space_info->groups_sem); |
5175 | list_add_tail(&cache->list, &space_info->block_groups); | |
5176 | up_write(&space_info->groups_sem); | |
0f9dd46c JB |
5177 | |
5178 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
5179 | BUG_ON(ret); | |
75ccf47d CM |
5180 | |
5181 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
9078a3e1 | 5182 | } |
0b86a832 CM |
5183 | ret = 0; |
5184 | error: | |
9078a3e1 | 5185 | btrfs_free_path(path); |
0b86a832 | 5186 | return ret; |
9078a3e1 | 5187 | } |
6324fbf3 CM |
5188 | |
5189 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
5190 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 5191 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
5192 | u64 size) |
5193 | { | |
5194 | int ret; | |
6324fbf3 CM |
5195 | struct btrfs_root *extent_root; |
5196 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
5197 | |
5198 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 5199 | |
e02119d5 CM |
5200 | root->fs_info->last_trans_new_blockgroup = trans->transid; |
5201 | ||
8f18cf13 | 5202 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
5203 | if (!cache) |
5204 | return -ENOMEM; | |
5205 | ||
e17cade2 | 5206 | cache->key.objectid = chunk_offset; |
6324fbf3 | 5207 | cache->key.offset = size; |
c286ac48 | 5208 | spin_lock_init(&cache->lock); |
25179201 | 5209 | mutex_init(&cache->alloc_mutex); |
0f9dd46c | 5210 | INIT_LIST_HEAD(&cache->list); |
6324fbf3 | 5211 | btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
0ef3e66b | 5212 | |
6324fbf3 | 5213 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
5214 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
5215 | cache->flags = type; | |
5216 | btrfs_set_block_group_flags(&cache->item, type); | |
5217 | ||
5218 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
5219 | &cache->space_info); | |
5220 | BUG_ON(ret); | |
80eb234a JB |
5221 | down_write(&cache->space_info->groups_sem); |
5222 | list_add_tail(&cache->list, &cache->space_info->block_groups); | |
5223 | up_write(&cache->space_info->groups_sem); | |
6324fbf3 | 5224 | |
0f9dd46c JB |
5225 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
5226 | BUG_ON(ret); | |
c286ac48 | 5227 | |
6324fbf3 CM |
5228 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
5229 | sizeof(cache->item)); | |
5230 | BUG_ON(ret); | |
5231 | ||
5232 | finish_current_insert(trans, extent_root); | |
5233 | ret = del_pending_extents(trans, extent_root); | |
5234 | BUG_ON(ret); | |
d18a2c44 | 5235 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 5236 | |
6324fbf3 CM |
5237 | return 0; |
5238 | } | |
1a40e23b ZY |
5239 | |
5240 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
5241 | struct btrfs_root *root, u64 group_start) | |
5242 | { | |
5243 | struct btrfs_path *path; | |
5244 | struct btrfs_block_group_cache *block_group; | |
5245 | struct btrfs_key key; | |
5246 | int ret; | |
5247 | ||
1a40e23b ZY |
5248 | root = root->fs_info->extent_root; |
5249 | ||
5250 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
5251 | BUG_ON(!block_group); | |
5252 | ||
5253 | memcpy(&key, &block_group->key, sizeof(key)); | |
5254 | ||
5255 | path = btrfs_alloc_path(); | |
5256 | BUG_ON(!path); | |
5257 | ||
5258 | btrfs_remove_free_space_cache(block_group); | |
5259 | rb_erase(&block_group->cache_node, | |
5260 | &root->fs_info->block_group_cache_tree); | |
80eb234a | 5261 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5262 | list_del(&block_group->list); |
80eb234a | 5263 | up_write(&block_group->space_info->groups_sem); |
1a40e23b ZY |
5264 | |
5265 | /* | |
5266 | memset(shrink_block_group, 0, sizeof(*shrink_block_group)); | |
5267 | kfree(shrink_block_group); | |
5268 | */ | |
5269 | ||
5270 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
5271 | if (ret > 0) | |
5272 | ret = -EIO; | |
5273 | if (ret < 0) | |
5274 | goto out; | |
5275 | ||
5276 | ret = btrfs_del_item(trans, root, path); | |
5277 | out: | |
5278 | btrfs_free_path(path); | |
5279 | return ret; | |
5280 | } |