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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; | |
f3465ca4 JB |
45 | struct list_head list; |
46 | int del; | |
31840ae1 ZY |
47 | }; |
48 | ||
e089f05c | 49 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
87ef2bb4 | 50 | btrfs_root *extent_root, int all); |
e20d96d6 | 51 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
87ef2bb4 | 52 | btrfs_root *extent_root, int all); |
925baedd CM |
53 | static struct btrfs_block_group_cache * |
54 | __btrfs_find_block_group(struct btrfs_root *root, | |
55 | struct btrfs_block_group_cache *hint, | |
56 | u64 search_start, int data, int owner); | |
f3465ca4 JB |
57 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
58 | struct btrfs_root *root, | |
59 | u64 bytenr, u64 num_bytes, int is_data); | |
60 | static int update_block_group(struct btrfs_trans_handle *trans, | |
61 | struct btrfs_root *root, | |
62 | u64 bytenr, u64 num_bytes, int alloc, | |
63 | int mark_free); | |
d548ee51 | 64 | |
0f9dd46c JB |
65 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
66 | { | |
67 | return (cache->flags & bits) == bits; | |
68 | } | |
69 | ||
70 | /* | |
71 | * this adds the block group to the fs_info rb tree for the block group | |
72 | * cache | |
73 | */ | |
74 | int btrfs_add_block_group_cache(struct btrfs_fs_info *info, | |
75 | struct btrfs_block_group_cache *block_group) | |
76 | { | |
77 | struct rb_node **p; | |
78 | struct rb_node *parent = NULL; | |
79 | struct btrfs_block_group_cache *cache; | |
80 | ||
81 | spin_lock(&info->block_group_cache_lock); | |
82 | p = &info->block_group_cache_tree.rb_node; | |
83 | ||
84 | while (*p) { | |
85 | parent = *p; | |
86 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
87 | cache_node); | |
88 | if (block_group->key.objectid < cache->key.objectid) { | |
89 | p = &(*p)->rb_left; | |
90 | } else if (block_group->key.objectid > cache->key.objectid) { | |
91 | p = &(*p)->rb_right; | |
92 | } else { | |
93 | spin_unlock(&info->block_group_cache_lock); | |
94 | return -EEXIST; | |
95 | } | |
96 | } | |
97 | ||
98 | rb_link_node(&block_group->cache_node, parent, p); | |
99 | rb_insert_color(&block_group->cache_node, | |
100 | &info->block_group_cache_tree); | |
101 | spin_unlock(&info->block_group_cache_lock); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | /* | |
107 | * This will return the block group at or after bytenr if contains is 0, else | |
108 | * it will return the block group that contains the bytenr | |
109 | */ | |
110 | static struct btrfs_block_group_cache * | |
111 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
112 | int contains) | |
113 | { | |
114 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
115 | struct rb_node *n; | |
116 | u64 end, start; | |
117 | ||
118 | spin_lock(&info->block_group_cache_lock); | |
119 | n = info->block_group_cache_tree.rb_node; | |
120 | ||
121 | while (n) { | |
122 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
123 | cache_node); | |
124 | end = cache->key.objectid + cache->key.offset - 1; | |
125 | start = cache->key.objectid; | |
126 | ||
127 | if (bytenr < start) { | |
128 | if (!contains && (!ret || start < ret->key.objectid)) | |
129 | ret = cache; | |
130 | n = n->rb_left; | |
131 | } else if (bytenr > start) { | |
132 | if (contains && bytenr <= end) { | |
133 | ret = cache; | |
134 | break; | |
135 | } | |
136 | n = n->rb_right; | |
137 | } else { | |
138 | ret = cache; | |
139 | break; | |
140 | } | |
141 | } | |
142 | spin_unlock(&info->block_group_cache_lock); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
147 | /* | |
148 | * this is only called by cache_block_group, since we could have freed extents | |
149 | * we need to check the pinned_extents for any extents that can't be used yet | |
150 | * since their free space will be released as soon as the transaction commits. | |
151 | */ | |
152 | static int add_new_free_space(struct btrfs_block_group_cache *block_group, | |
153 | struct btrfs_fs_info *info, u64 start, u64 end) | |
154 | { | |
155 | u64 extent_start, extent_end, size; | |
156 | int ret; | |
157 | ||
25179201 | 158 | mutex_lock(&info->pinned_mutex); |
0f9dd46c JB |
159 | while (start < end) { |
160 | ret = find_first_extent_bit(&info->pinned_extents, start, | |
161 | &extent_start, &extent_end, | |
162 | EXTENT_DIRTY); | |
163 | if (ret) | |
164 | break; | |
165 | ||
166 | if (extent_start == start) { | |
167 | start = extent_end + 1; | |
168 | } else if (extent_start > start && extent_start < end) { | |
169 | size = extent_start - start; | |
25179201 JB |
170 | ret = btrfs_add_free_space_lock(block_group, start, |
171 | size); | |
0f9dd46c JB |
172 | BUG_ON(ret); |
173 | start = extent_end + 1; | |
174 | } else { | |
175 | break; | |
176 | } | |
177 | } | |
178 | ||
179 | if (start < end) { | |
180 | size = end - start; | |
25179201 | 181 | ret = btrfs_add_free_space_lock(block_group, start, size); |
0f9dd46c JB |
182 | BUG_ON(ret); |
183 | } | |
25179201 | 184 | mutex_unlock(&info->pinned_mutex); |
0f9dd46c JB |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
e37c9e69 CM |
189 | static int cache_block_group(struct btrfs_root *root, |
190 | struct btrfs_block_group_cache *block_group) | |
191 | { | |
192 | struct btrfs_path *path; | |
ef8bbdfe | 193 | int ret = 0; |
e37c9e69 | 194 | struct btrfs_key key; |
5f39d397 | 195 | struct extent_buffer *leaf; |
e37c9e69 | 196 | int slot; |
e37c9e69 | 197 | u64 last = 0; |
7d7d6068 | 198 | u64 first_free; |
e37c9e69 CM |
199 | int found = 0; |
200 | ||
00f5c795 CM |
201 | if (!block_group) |
202 | return 0; | |
203 | ||
e37c9e69 | 204 | root = root->fs_info->extent_root; |
e37c9e69 CM |
205 | |
206 | if (block_group->cached) | |
207 | return 0; | |
f510cfec | 208 | |
e37c9e69 CM |
209 | path = btrfs_alloc_path(); |
210 | if (!path) | |
211 | return -ENOMEM; | |
7d7d6068 | 212 | |
2cc58cf2 | 213 | path->reada = 2; |
5cd57b2c CM |
214 | /* |
215 | * we get into deadlocks with paths held by callers of this function. | |
216 | * since the alloc_mutex is protecting things right now, just | |
217 | * skip the locking here | |
218 | */ | |
219 | path->skip_locking = 1; | |
0f9dd46c JB |
220 | first_free = max_t(u64, block_group->key.objectid, |
221 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); | |
e37c9e69 | 222 | key.objectid = block_group->key.objectid; |
e37c9e69 CM |
223 | key.offset = 0; |
224 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
225 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
226 | if (ret < 0) | |
ef8bbdfe | 227 | goto err; |
0b86a832 | 228 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
d548ee51 | 229 | if (ret < 0) |
ef8bbdfe | 230 | goto err; |
d548ee51 Y |
231 | if (ret == 0) { |
232 | leaf = path->nodes[0]; | |
233 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
234 | if (key.objectid + key.offset > first_free) | |
235 | first_free = key.objectid + key.offset; | |
236 | } | |
e37c9e69 | 237 | while(1) { |
5f39d397 | 238 | leaf = path->nodes[0]; |
e37c9e69 | 239 | slot = path->slots[0]; |
5f39d397 | 240 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 241 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
242 | if (ret < 0) |
243 | goto err; | |
0f9dd46c | 244 | if (ret == 0) |
e37c9e69 | 245 | continue; |
0f9dd46c | 246 | else |
e37c9e69 | 247 | break; |
e37c9e69 | 248 | } |
5f39d397 | 249 | btrfs_item_key_to_cpu(leaf, &key, slot); |
0f9dd46c | 250 | if (key.objectid < block_group->key.objectid) |
7d7d6068 | 251 | goto next; |
0f9dd46c | 252 | |
e37c9e69 | 253 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 254 | block_group->key.offset) |
e37c9e69 | 255 | break; |
7d7d6068 | 256 | |
e37c9e69 CM |
257 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
258 | if (!found) { | |
7d7d6068 | 259 | last = first_free; |
e37c9e69 | 260 | found = 1; |
e37c9e69 | 261 | } |
0f9dd46c JB |
262 | |
263 | add_new_free_space(block_group, root->fs_info, last, | |
264 | key.objectid); | |
265 | ||
7d7d6068 | 266 | last = key.objectid + key.offset; |
e37c9e69 | 267 | } |
7d7d6068 | 268 | next: |
e37c9e69 CM |
269 | path->slots[0]++; |
270 | } | |
271 | ||
7d7d6068 Y |
272 | if (!found) |
273 | last = first_free; | |
0f9dd46c JB |
274 | |
275 | add_new_free_space(block_group, root->fs_info, last, | |
276 | block_group->key.objectid + | |
277 | block_group->key.offset); | |
278 | ||
e37c9e69 | 279 | block_group->cached = 1; |
ef8bbdfe | 280 | ret = 0; |
54aa1f4d | 281 | err: |
e37c9e69 | 282 | btrfs_free_path(path); |
ef8bbdfe | 283 | return ret; |
e37c9e69 CM |
284 | } |
285 | ||
0f9dd46c JB |
286 | /* |
287 | * return the block group that starts at or after bytenr | |
288 | */ | |
0ef3e66b CM |
289 | struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct |
290 | btrfs_fs_info *info, | |
291 | u64 bytenr) | |
292 | { | |
0f9dd46c | 293 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 294 | |
0f9dd46c | 295 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 296 | |
0f9dd46c | 297 | return cache; |
0ef3e66b CM |
298 | } |
299 | ||
0f9dd46c JB |
300 | /* |
301 | * return the block group that contains teh given bytenr | |
302 | */ | |
5276aeda CM |
303 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
304 | btrfs_fs_info *info, | |
db94535d | 305 | u64 bytenr) |
be744175 | 306 | { |
0f9dd46c | 307 | struct btrfs_block_group_cache *cache; |
be744175 | 308 | |
0f9dd46c | 309 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 310 | |
0f9dd46c | 311 | return cache; |
be744175 | 312 | } |
0b86a832 | 313 | |
0f9dd46c JB |
314 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
315 | u64 flags) | |
6324fbf3 | 316 | { |
0f9dd46c JB |
317 | struct list_head *head = &info->space_info; |
318 | struct list_head *cur; | |
319 | struct btrfs_space_info *found; | |
320 | list_for_each(cur, head) { | |
321 | found = list_entry(cur, struct btrfs_space_info, list); | |
322 | if (found->flags == flags) | |
323 | return found; | |
324 | } | |
325 | return NULL; | |
6324fbf3 CM |
326 | } |
327 | ||
80eb234a JB |
328 | static u64 div_factor(u64 num, int factor) |
329 | { | |
330 | if (factor == 10) | |
331 | return num; | |
332 | num *= factor; | |
333 | do_div(num, 10); | |
334 | return num; | |
335 | } | |
336 | ||
925baedd CM |
337 | static struct btrfs_block_group_cache * |
338 | __btrfs_find_block_group(struct btrfs_root *root, | |
339 | struct btrfs_block_group_cache *hint, | |
340 | u64 search_start, int data, int owner) | |
cd1bc465 | 341 | { |
96b5179d | 342 | struct btrfs_block_group_cache *cache; |
31f3c99b | 343 | struct btrfs_block_group_cache *found_group = NULL; |
cd1bc465 CM |
344 | struct btrfs_fs_info *info = root->fs_info; |
345 | u64 used; | |
31f3c99b | 346 | u64 last = 0; |
96b5179d | 347 | u64 free_check; |
31f3c99b | 348 | int full_search = 0; |
bce4eae9 | 349 | int factor = 10; |
0ef3e66b | 350 | int wrapped = 0; |
de428b63 | 351 | |
a236aed1 CM |
352 | if (data & BTRFS_BLOCK_GROUP_METADATA) |
353 | factor = 9; | |
be744175 | 354 | |
0ef3e66b | 355 | if (search_start) { |
be744175 | 356 | struct btrfs_block_group_cache *shint; |
0ef3e66b | 357 | shint = btrfs_lookup_first_block_group(info, search_start); |
8f18cf13 | 358 | if (shint && block_group_bits(shint, data) && !shint->ro) { |
c286ac48 | 359 | spin_lock(&shint->lock); |
be744175 | 360 | used = btrfs_block_group_used(&shint->item); |
e8569813 | 361 | if (used + shint->pinned + shint->reserved < |
324ae4df | 362 | div_factor(shint->key.offset, factor)) { |
c286ac48 | 363 | spin_unlock(&shint->lock); |
be744175 CM |
364 | return shint; |
365 | } | |
c286ac48 | 366 | spin_unlock(&shint->lock); |
be744175 CM |
367 | } |
368 | } | |
0ef3e66b | 369 | if (hint && !hint->ro && block_group_bits(hint, data)) { |
c286ac48 | 370 | spin_lock(&hint->lock); |
31f3c99b | 371 | used = btrfs_block_group_used(&hint->item); |
e8569813 | 372 | if (used + hint->pinned + hint->reserved < |
324ae4df | 373 | div_factor(hint->key.offset, factor)) { |
c286ac48 | 374 | spin_unlock(&hint->lock); |
31f3c99b CM |
375 | return hint; |
376 | } | |
c286ac48 | 377 | spin_unlock(&hint->lock); |
e19caa5f | 378 | last = hint->key.objectid + hint->key.offset; |
31f3c99b | 379 | } else { |
e37c9e69 | 380 | if (hint) |
0ef3e66b | 381 | last = max(hint->key.objectid, search_start); |
e37c9e69 | 382 | else |
0ef3e66b | 383 | last = search_start; |
31f3c99b | 384 | } |
31f3c99b | 385 | again: |
e8569813 ZY |
386 | while (1) { |
387 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
388 | if (!cache) |
389 | break; | |
96b5179d | 390 | |
c286ac48 | 391 | spin_lock(&cache->lock); |
96b5179d CM |
392 | last = cache->key.objectid + cache->key.offset; |
393 | used = btrfs_block_group_used(&cache->item); | |
394 | ||
8f18cf13 | 395 | if (!cache->ro && block_group_bits(cache, data)) { |
0ef3e66b | 396 | free_check = div_factor(cache->key.offset, factor); |
e8569813 ZY |
397 | if (used + cache->pinned + cache->reserved < |
398 | free_check) { | |
8790d502 | 399 | found_group = cache; |
c286ac48 | 400 | spin_unlock(&cache->lock); |
8790d502 CM |
401 | goto found; |
402 | } | |
6324fbf3 | 403 | } |
c286ac48 | 404 | spin_unlock(&cache->lock); |
de428b63 | 405 | cond_resched(); |
cd1bc465 | 406 | } |
0ef3e66b CM |
407 | if (!wrapped) { |
408 | last = search_start; | |
409 | wrapped = 1; | |
410 | goto again; | |
411 | } | |
412 | if (!full_search && factor < 10) { | |
be744175 | 413 | last = search_start; |
31f3c99b | 414 | full_search = 1; |
0ef3e66b | 415 | factor = 10; |
31f3c99b CM |
416 | goto again; |
417 | } | |
be744175 | 418 | found: |
31f3c99b | 419 | return found_group; |
cd1bc465 CM |
420 | } |
421 | ||
925baedd CM |
422 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
423 | struct btrfs_block_group_cache | |
424 | *hint, u64 search_start, | |
425 | int data, int owner) | |
426 | { | |
427 | ||
428 | struct btrfs_block_group_cache *ret; | |
925baedd | 429 | ret = __btrfs_find_block_group(root, hint, search_start, data, owner); |
925baedd CM |
430 | return ret; |
431 | } | |
0f9dd46c | 432 | |
e02119d5 | 433 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 434 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
435 | { |
436 | int ret; | |
437 | struct btrfs_key key; | |
31840ae1 | 438 | struct btrfs_path *path; |
e02119d5 | 439 | |
31840ae1 ZY |
440 | path = btrfs_alloc_path(); |
441 | BUG_ON(!path); | |
e02119d5 CM |
442 | key.objectid = start; |
443 | key.offset = len; | |
444 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
445 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
446 | 0, 0); | |
31840ae1 | 447 | btrfs_free_path(path); |
7bb86316 CM |
448 | return ret; |
449 | } | |
450 | ||
d8d5f3e1 CM |
451 | /* |
452 | * Back reference rules. Back refs have three main goals: | |
453 | * | |
454 | * 1) differentiate between all holders of references to an extent so that | |
455 | * when a reference is dropped we can make sure it was a valid reference | |
456 | * before freeing the extent. | |
457 | * | |
458 | * 2) Provide enough information to quickly find the holders of an extent | |
459 | * if we notice a given block is corrupted or bad. | |
460 | * | |
461 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
462 | * maintenance. This is actually the same as #2, but with a slightly | |
463 | * different use case. | |
464 | * | |
465 | * File extents can be referenced by: | |
466 | * | |
467 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 468 | * - different files inside a single subvolume |
d8d5f3e1 CM |
469 | * - different offsets inside a file (bookend extents in file.c) |
470 | * | |
471 | * The extent ref structure has fields for: | |
472 | * | |
473 | * - Objectid of the subvolume root | |
474 | * - Generation number of the tree holding the reference | |
475 | * - objectid of the file holding the reference | |
31840ae1 ZY |
476 | * - number of references holding by parent node (alway 1 for tree blocks) |
477 | * | |
478 | * Btree leaf may hold multiple references to a file extent. In most cases, | |
479 | * these references are from same file and the corresponding offsets inside | |
3bb1a1bc | 480 | * the file are close together. |
d8d5f3e1 CM |
481 | * |
482 | * When a file extent is allocated the fields are filled in: | |
3bb1a1bc | 483 | * (root_key.objectid, trans->transid, inode objectid, 1) |
d8d5f3e1 CM |
484 | * |
485 | * When a leaf is cow'd new references are added for every file extent found | |
31840ae1 ZY |
486 | * in the leaf. It looks similar to the create case, but trans->transid will |
487 | * be different when the block is cow'd. | |
d8d5f3e1 | 488 | * |
3bb1a1bc | 489 | * (root_key.objectid, trans->transid, inode objectid, |
31840ae1 | 490 | * number of references in the leaf) |
d8d5f3e1 | 491 | * |
3bb1a1bc YZ |
492 | * When a file extent is removed either during snapshot deletion or |
493 | * file truncation, we find the corresponding back reference and check | |
494 | * the following fields: | |
d8d5f3e1 | 495 | * |
3bb1a1bc YZ |
496 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
497 | * inode objectid) | |
d8d5f3e1 CM |
498 | * |
499 | * Btree extents can be referenced by: | |
500 | * | |
501 | * - Different subvolumes | |
502 | * - Different generations of the same subvolume | |
503 | * | |
d8d5f3e1 CM |
504 | * When a tree block is created, back references are inserted: |
505 | * | |
3bb1a1bc | 506 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 507 | * |
31840ae1 ZY |
508 | * When a tree block is cow'd, new back references are added for all the |
509 | * blocks it points to. If the tree block isn't in reference counted root, | |
510 | * the old back references are removed. These new back references are of | |
511 | * the form (trans->transid will have increased since creation): | |
d8d5f3e1 | 512 | * |
3bb1a1bc | 513 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 514 | * |
31840ae1 | 515 | * When a backref is in deleting, the following fields are checked: |
d8d5f3e1 CM |
516 | * |
517 | * if backref was for a tree root: | |
3bb1a1bc | 518 | * (btrfs_header_owner(itself), btrfs_header_generation(itself), level) |
d8d5f3e1 | 519 | * else |
3bb1a1bc | 520 | * (btrfs_header_owner(parent), btrfs_header_generation(parent), level) |
d8d5f3e1 | 521 | * |
31840ae1 | 522 | * Back Reference Key composing: |
d8d5f3e1 | 523 | * |
31840ae1 ZY |
524 | * The key objectid corresponds to the first byte in the extent, the key |
525 | * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first | |
526 | * byte of parent extent. If a extent is tree root, the key offset is set | |
527 | * to the key objectid. | |
d8d5f3e1 | 528 | */ |
31840ae1 ZY |
529 | |
530 | static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, | |
531 | struct btrfs_root *root, | |
3bb1a1bc YZ |
532 | struct btrfs_path *path, |
533 | u64 bytenr, u64 parent, | |
534 | u64 ref_root, u64 ref_generation, | |
535 | u64 owner_objectid, int del) | |
7bb86316 | 536 | { |
7bb86316 | 537 | struct btrfs_key key; |
31840ae1 ZY |
538 | struct btrfs_extent_ref *ref; |
539 | struct extent_buffer *leaf; | |
3bb1a1bc | 540 | u64 ref_objectid; |
74493f7a CM |
541 | int ret; |
542 | ||
31840ae1 ZY |
543 | key.objectid = bytenr; |
544 | key.type = BTRFS_EXTENT_REF_KEY; | |
545 | key.offset = parent; | |
546 | ||
547 | ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); | |
548 | if (ret < 0) | |
549 | goto out; | |
550 | if (ret > 0) { | |
551 | ret = -ENOENT; | |
552 | goto out; | |
553 | } | |
554 | ||
555 | leaf = path->nodes[0]; | |
556 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
3bb1a1bc | 557 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
31840ae1 | 558 | if (btrfs_ref_root(leaf, ref) != ref_root || |
3bb1a1bc YZ |
559 | btrfs_ref_generation(leaf, ref) != ref_generation || |
560 | (ref_objectid != owner_objectid && | |
561 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { | |
31840ae1 ZY |
562 | ret = -EIO; |
563 | WARN_ON(1); | |
564 | goto out; | |
565 | } | |
566 | ret = 0; | |
567 | out: | |
568 | return ret; | |
569 | } | |
570 | ||
f3465ca4 JB |
571 | /* |
572 | * updates all the backrefs that are pending on update_list for the | |
573 | * extent_root | |
574 | */ | |
575 | static int noinline update_backrefs(struct btrfs_trans_handle *trans, | |
576 | struct btrfs_root *extent_root, | |
577 | struct btrfs_path *path, | |
578 | struct list_head *update_list) | |
579 | { | |
580 | struct btrfs_key key; | |
581 | struct btrfs_extent_ref *ref; | |
582 | struct btrfs_fs_info *info = extent_root->fs_info; | |
583 | struct pending_extent_op *op; | |
584 | struct extent_buffer *leaf; | |
585 | int ret = 0; | |
586 | struct list_head *cur = update_list->next; | |
587 | u64 ref_objectid; | |
588 | u64 ref_root = extent_root->root_key.objectid; | |
589 | ||
590 | op = list_entry(cur, struct pending_extent_op, list); | |
591 | ||
592 | search: | |
593 | key.objectid = op->bytenr; | |
594 | key.type = BTRFS_EXTENT_REF_KEY; | |
595 | key.offset = op->orig_parent; | |
596 | ||
597 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 1); | |
598 | BUG_ON(ret); | |
599 | ||
600 | leaf = path->nodes[0]; | |
601 | ||
602 | loop: | |
603 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
604 | ||
605 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
606 | ||
607 | if (btrfs_ref_root(leaf, ref) != ref_root || | |
608 | btrfs_ref_generation(leaf, ref) != op->orig_generation || | |
609 | (ref_objectid != op->level && | |
610 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { | |
611 | printk(KERN_ERR "couldn't find %Lu, parent %Lu, root %Lu, " | |
612 | "owner %u\n", op->bytenr, op->orig_parent, | |
613 | ref_root, op->level); | |
614 | btrfs_print_leaf(extent_root, leaf); | |
615 | BUG(); | |
616 | } | |
617 | ||
618 | key.objectid = op->bytenr; | |
619 | key.offset = op->parent; | |
620 | key.type = BTRFS_EXTENT_REF_KEY; | |
621 | ret = btrfs_set_item_key_safe(trans, extent_root, path, &key); | |
622 | BUG_ON(ret); | |
623 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
624 | btrfs_set_ref_generation(leaf, ref, op->generation); | |
625 | ||
626 | cur = cur->next; | |
627 | ||
628 | list_del_init(&op->list); | |
629 | unlock_extent(&info->extent_ins, op->bytenr, | |
630 | op->bytenr + op->num_bytes - 1, GFP_NOFS); | |
631 | kfree(op); | |
632 | ||
633 | if (cur == update_list) { | |
634 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
635 | btrfs_release_path(extent_root, path); | |
636 | goto out; | |
637 | } | |
638 | ||
639 | op = list_entry(cur, struct pending_extent_op, list); | |
640 | ||
641 | path->slots[0]++; | |
642 | while (path->slots[0] < btrfs_header_nritems(leaf)) { | |
643 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
644 | if (key.objectid == op->bytenr && | |
645 | key.type == BTRFS_EXTENT_REF_KEY) | |
646 | goto loop; | |
647 | path->slots[0]++; | |
648 | } | |
649 | ||
650 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
651 | btrfs_release_path(extent_root, path); | |
652 | goto search; | |
653 | ||
654 | out: | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int noinline insert_extents(struct btrfs_trans_handle *trans, | |
659 | struct btrfs_root *extent_root, | |
660 | struct btrfs_path *path, | |
661 | struct list_head *insert_list, int nr) | |
662 | { | |
663 | struct btrfs_key *keys; | |
664 | u32 *data_size; | |
665 | struct pending_extent_op *op; | |
666 | struct extent_buffer *leaf; | |
667 | struct list_head *cur = insert_list->next; | |
668 | struct btrfs_fs_info *info = extent_root->fs_info; | |
669 | u64 ref_root = extent_root->root_key.objectid; | |
670 | int i = 0, last = 0, ret; | |
671 | int total = nr * 2; | |
672 | ||
673 | if (!nr) | |
674 | return 0; | |
675 | ||
676 | keys = kzalloc(total * sizeof(struct btrfs_key), GFP_NOFS); | |
677 | if (!keys) | |
678 | return -ENOMEM; | |
679 | ||
680 | data_size = kzalloc(total * sizeof(u32), GFP_NOFS); | |
681 | if (!data_size) { | |
682 | kfree(keys); | |
683 | return -ENOMEM; | |
684 | } | |
685 | ||
686 | list_for_each_entry(op, insert_list, list) { | |
687 | keys[i].objectid = op->bytenr; | |
688 | keys[i].offset = op->num_bytes; | |
689 | keys[i].type = BTRFS_EXTENT_ITEM_KEY; | |
690 | data_size[i] = sizeof(struct btrfs_extent_item); | |
691 | i++; | |
692 | ||
693 | keys[i].objectid = op->bytenr; | |
694 | keys[i].offset = op->parent; | |
695 | keys[i].type = BTRFS_EXTENT_REF_KEY; | |
696 | data_size[i] = sizeof(struct btrfs_extent_ref); | |
697 | i++; | |
698 | } | |
699 | ||
700 | op = list_entry(cur, struct pending_extent_op, list); | |
701 | i = 0; | |
702 | while (i < total) { | |
703 | int c; | |
704 | ret = btrfs_insert_some_items(trans, extent_root, path, | |
705 | keys+i, data_size+i, total-i); | |
706 | BUG_ON(ret < 0); | |
707 | ||
708 | if (last && ret > 1) | |
709 | BUG(); | |
710 | ||
711 | leaf = path->nodes[0]; | |
712 | for (c = 0; c < ret; c++) { | |
713 | int ref_first = keys[i].type == BTRFS_EXTENT_REF_KEY; | |
714 | ||
715 | /* | |
716 | * if the first item we inserted was a backref, then | |
717 | * the EXTENT_ITEM will be the odd c's, else it will | |
718 | * be the even c's | |
719 | */ | |
720 | if ((ref_first && (c % 2)) || | |
721 | (!ref_first && !(c % 2))) { | |
722 | struct btrfs_extent_item *itm; | |
723 | ||
724 | itm = btrfs_item_ptr(leaf, path->slots[0] + c, | |
725 | struct btrfs_extent_item); | |
726 | btrfs_set_extent_refs(path->nodes[0], itm, 1); | |
727 | op->del++; | |
728 | } else { | |
729 | struct btrfs_extent_ref *ref; | |
730 | ||
731 | ref = btrfs_item_ptr(leaf, path->slots[0] + c, | |
732 | struct btrfs_extent_ref); | |
733 | btrfs_set_ref_root(leaf, ref, ref_root); | |
734 | btrfs_set_ref_generation(leaf, ref, | |
735 | op->generation); | |
736 | btrfs_set_ref_objectid(leaf, ref, op->level); | |
737 | btrfs_set_ref_num_refs(leaf, ref, 1); | |
738 | op->del++; | |
739 | } | |
740 | ||
741 | /* | |
742 | * using del to see when its ok to free up the | |
743 | * pending_extent_op. In the case where we insert the | |
744 | * last item on the list in order to help do batching | |
745 | * we need to not free the extent op until we actually | |
746 | * insert the extent_item | |
747 | */ | |
748 | if (op->del == 2) { | |
749 | unlock_extent(&info->extent_ins, op->bytenr, | |
750 | op->bytenr + op->num_bytes - 1, | |
751 | GFP_NOFS); | |
752 | cur = cur->next; | |
753 | list_del_init(&op->list); | |
754 | kfree(op); | |
755 | if (cur != insert_list) | |
756 | op = list_entry(cur, | |
757 | struct pending_extent_op, | |
758 | list); | |
759 | } | |
760 | } | |
761 | btrfs_mark_buffer_dirty(leaf); | |
762 | btrfs_release_path(extent_root, path); | |
763 | ||
764 | /* | |
765 | * Ok backref's and items usually go right next to eachother, | |
766 | * but if we could only insert 1 item that means that we | |
767 | * inserted on the end of a leaf, and we have no idea what may | |
768 | * be on the next leaf so we just play it safe. In order to | |
769 | * try and help this case we insert the last thing on our | |
770 | * insert list so hopefully it will end up being the last | |
771 | * thing on the leaf and everything else will be before it, | |
772 | * which will let us insert a whole bunch of items at the same | |
773 | * time. | |
774 | */ | |
775 | if (ret == 1 && !last && (i + ret < total)) { | |
776 | /* | |
777 | * last: where we will pick up the next time around | |
778 | * i: our current key to insert, will be total - 1 | |
779 | * cur: the current op we are screwing with | |
780 | * op: duh | |
781 | */ | |
782 | last = i + ret; | |
783 | i = total - 1; | |
784 | cur = insert_list->prev; | |
785 | op = list_entry(cur, struct pending_extent_op, list); | |
786 | } else if (last) { | |
787 | /* | |
788 | * ok we successfully inserted the last item on the | |
789 | * list, lets reset everything | |
790 | * | |
791 | * i: our current key to insert, so where we left off | |
792 | * last time | |
793 | * last: done with this | |
794 | * cur: the op we are messing with | |
795 | * op: duh | |
796 | * total: since we inserted the last key, we need to | |
797 | * decrement total so we dont overflow | |
798 | */ | |
799 | i = last; | |
800 | last = 0; | |
801 | cur = insert_list->next; | |
802 | op = list_entry(cur, struct pending_extent_op, list); | |
803 | total--; | |
804 | } else { | |
805 | i += ret; | |
806 | } | |
807 | ||
808 | cond_resched(); | |
809 | } | |
810 | ret = 0; | |
811 | kfree(keys); | |
812 | kfree(data_size); | |
813 | return ret; | |
814 | } | |
815 | ||
31840ae1 ZY |
816 | static int noinline insert_extent_backref(struct btrfs_trans_handle *trans, |
817 | struct btrfs_root *root, | |
818 | struct btrfs_path *path, | |
819 | u64 bytenr, u64 parent, | |
820 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 821 | u64 owner_objectid) |
31840ae1 ZY |
822 | { |
823 | struct btrfs_key key; | |
824 | struct extent_buffer *leaf; | |
825 | struct btrfs_extent_ref *ref; | |
826 | u32 num_refs; | |
827 | int ret; | |
74493f7a | 828 | |
74493f7a CM |
829 | key.objectid = bytenr; |
830 | key.type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 831 | key.offset = parent; |
74493f7a | 832 | |
31840ae1 ZY |
833 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); |
834 | if (ret == 0) { | |
835 | leaf = path->nodes[0]; | |
836 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
837 | struct btrfs_extent_ref); | |
838 | btrfs_set_ref_root(leaf, ref, ref_root); | |
839 | btrfs_set_ref_generation(leaf, ref, ref_generation); | |
840 | btrfs_set_ref_objectid(leaf, ref, owner_objectid); | |
31840ae1 ZY |
841 | btrfs_set_ref_num_refs(leaf, ref, 1); |
842 | } else if (ret == -EEXIST) { | |
843 | u64 existing_owner; | |
844 | BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); | |
845 | leaf = path->nodes[0]; | |
846 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
847 | struct btrfs_extent_ref); | |
848 | if (btrfs_ref_root(leaf, ref) != ref_root || | |
849 | btrfs_ref_generation(leaf, ref) != ref_generation) { | |
850 | ret = -EIO; | |
851 | WARN_ON(1); | |
7bb86316 | 852 | goto out; |
31840ae1 ZY |
853 | } |
854 | ||
855 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
856 | BUG_ON(num_refs == 0); | |
857 | btrfs_set_ref_num_refs(leaf, ref, num_refs + 1); | |
858 | ||
859 | existing_owner = btrfs_ref_objectid(leaf, ref); | |
3bb1a1bc YZ |
860 | if (existing_owner != owner_objectid && |
861 | existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { | |
31840ae1 ZY |
862 | btrfs_set_ref_objectid(leaf, ref, |
863 | BTRFS_MULTIPLE_OBJECTIDS); | |
31840ae1 ZY |
864 | } |
865 | ret = 0; | |
866 | } else { | |
7bb86316 | 867 | goto out; |
31840ae1 | 868 | } |
7bb86316 CM |
869 | btrfs_mark_buffer_dirty(path->nodes[0]); |
870 | out: | |
871 | btrfs_release_path(root, path); | |
872 | return ret; | |
74493f7a CM |
873 | } |
874 | ||
31840ae1 ZY |
875 | static int noinline remove_extent_backref(struct btrfs_trans_handle *trans, |
876 | struct btrfs_root *root, | |
877 | struct btrfs_path *path) | |
878 | { | |
879 | struct extent_buffer *leaf; | |
880 | struct btrfs_extent_ref *ref; | |
881 | u32 num_refs; | |
882 | int ret = 0; | |
883 | ||
884 | leaf = path->nodes[0]; | |
885 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
886 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
887 | BUG_ON(num_refs == 0); | |
888 | num_refs -= 1; | |
889 | if (num_refs == 0) { | |
890 | ret = btrfs_del_item(trans, root, path); | |
891 | } else { | |
892 | btrfs_set_ref_num_refs(leaf, ref, num_refs); | |
893 | btrfs_mark_buffer_dirty(leaf); | |
894 | } | |
895 | btrfs_release_path(root, path); | |
896 | return ret; | |
897 | } | |
898 | ||
f3465ca4 JB |
899 | static int noinline free_extents(struct btrfs_trans_handle *trans, |
900 | struct btrfs_root *extent_root, | |
901 | struct list_head *del_list) | |
902 | { | |
903 | struct btrfs_fs_info *info = extent_root->fs_info; | |
904 | struct btrfs_path *path; | |
905 | struct btrfs_key key, found_key; | |
906 | struct extent_buffer *leaf; | |
907 | struct list_head *cur; | |
908 | struct pending_extent_op *op; | |
909 | struct btrfs_extent_item *ei; | |
910 | int ret, num_to_del, extent_slot = 0, found_extent = 0; | |
911 | u32 refs; | |
912 | u64 bytes_freed = 0; | |
913 | ||
914 | path = btrfs_alloc_path(); | |
915 | if (!path) | |
916 | return -ENOMEM; | |
917 | path->reada = 1; | |
918 | ||
919 | search: | |
920 | /* search for the backref for the current ref we want to delete */ | |
921 | cur = del_list->next; | |
922 | op = list_entry(cur, struct pending_extent_op, list); | |
923 | ret = lookup_extent_backref(trans, extent_root, path, op->bytenr, | |
924 | op->orig_parent, | |
925 | extent_root->root_key.objectid, | |
926 | op->orig_generation, op->level, 1); | |
927 | if (ret) { | |
928 | printk("Unable to find backref byte nr %Lu root %Lu gen %Lu " | |
929 | "owner %u\n", op->bytenr, | |
930 | extent_root->root_key.objectid, op->orig_generation, | |
931 | op->level); | |
932 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
933 | WARN_ON(1); | |
934 | goto out; | |
935 | } | |
936 | ||
937 | extent_slot = path->slots[0]; | |
938 | num_to_del = 1; | |
939 | found_extent = 0; | |
940 | ||
941 | /* | |
942 | * if we aren't the first item on the leaf we can move back one and see | |
943 | * if our ref is right next to our extent item | |
944 | */ | |
945 | if (likely(extent_slot)) { | |
946 | extent_slot--; | |
947 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
948 | extent_slot); | |
949 | if (found_key.objectid == op->bytenr && | |
950 | found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
951 | found_key.offset == op->num_bytes) { | |
952 | num_to_del++; | |
953 | found_extent = 1; | |
954 | } | |
955 | } | |
956 | ||
957 | /* | |
958 | * if we didn't find the extent we need to delete the backref and then | |
959 | * search for the extent item key so we can update its ref count | |
960 | */ | |
961 | if (!found_extent) { | |
962 | key.objectid = op->bytenr; | |
963 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
964 | key.offset = op->num_bytes; | |
965 | ||
966 | ret = remove_extent_backref(trans, extent_root, path); | |
967 | BUG_ON(ret); | |
968 | btrfs_release_path(extent_root, path); | |
969 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); | |
970 | BUG_ON(ret); | |
971 | extent_slot = path->slots[0]; | |
972 | } | |
973 | ||
974 | /* this is where we update the ref count for the extent */ | |
975 | leaf = path->nodes[0]; | |
976 | ei = btrfs_item_ptr(leaf, extent_slot, struct btrfs_extent_item); | |
977 | refs = btrfs_extent_refs(leaf, ei); | |
978 | BUG_ON(refs == 0); | |
979 | refs--; | |
980 | btrfs_set_extent_refs(leaf, ei, refs); | |
981 | ||
982 | btrfs_mark_buffer_dirty(leaf); | |
983 | ||
984 | /* | |
985 | * This extent needs deleting. The reason cur_slot is extent_slot + | |
986 | * num_to_del is because extent_slot points to the slot where the extent | |
987 | * is, and if the backref was not right next to the extent we will be | |
988 | * deleting at least 1 item, and will want to start searching at the | |
989 | * slot directly next to extent_slot. However if we did find the | |
990 | * backref next to the extent item them we will be deleting at least 2 | |
991 | * items and will want to start searching directly after the ref slot | |
992 | */ | |
993 | if (!refs) { | |
994 | struct list_head *pos, *n, *end; | |
995 | int cur_slot = extent_slot+num_to_del; | |
996 | u64 super_used; | |
997 | u64 root_used; | |
998 | ||
999 | path->slots[0] = extent_slot; | |
1000 | bytes_freed = op->num_bytes; | |
1001 | ||
1002 | /* | |
1003 | * we need to see if we can delete multiple things at once, so | |
1004 | * start looping through the list of extents we are wanting to | |
1005 | * delete and see if their extent/backref's are right next to | |
1006 | * eachother and the extents only have 1 ref | |
1007 | */ | |
1008 | for (pos = cur->next; pos != del_list; pos = pos->next) { | |
1009 | struct pending_extent_op *tmp; | |
1010 | ||
1011 | tmp = list_entry(pos, struct pending_extent_op, list); | |
1012 | ||
1013 | /* we only want to delete extent+ref at this stage */ | |
1014 | if (cur_slot >= btrfs_header_nritems(leaf) - 1) | |
1015 | break; | |
1016 | ||
1017 | btrfs_item_key_to_cpu(leaf, &found_key, cur_slot); | |
1018 | if (found_key.objectid != tmp->bytenr || | |
1019 | found_key.type != BTRFS_EXTENT_ITEM_KEY || | |
1020 | found_key.offset != tmp->num_bytes) | |
1021 | break; | |
1022 | ||
1023 | /* check to make sure this extent only has one ref */ | |
1024 | ei = btrfs_item_ptr(leaf, cur_slot, | |
1025 | struct btrfs_extent_item); | |
1026 | if (btrfs_extent_refs(leaf, ei) != 1) | |
1027 | break; | |
1028 | ||
1029 | btrfs_item_key_to_cpu(leaf, &found_key, cur_slot+1); | |
1030 | if (found_key.objectid != tmp->bytenr || | |
1031 | found_key.type != BTRFS_EXTENT_REF_KEY || | |
1032 | found_key.offset != tmp->orig_parent) | |
1033 | break; | |
1034 | ||
1035 | /* | |
1036 | * the ref is right next to the extent, we can set the | |
1037 | * ref count to 0 since we will delete them both now | |
1038 | */ | |
1039 | btrfs_set_extent_refs(leaf, ei, 0); | |
1040 | ||
1041 | /* pin down the bytes for this extent */ | |
1042 | mutex_lock(&info->pinned_mutex); | |
1043 | ret = pin_down_bytes(trans, extent_root, tmp->bytenr, | |
1044 | tmp->num_bytes, tmp->level >= | |
1045 | BTRFS_FIRST_FREE_OBJECTID); | |
1046 | mutex_unlock(&info->pinned_mutex); | |
1047 | BUG_ON(ret < 0); | |
1048 | ||
1049 | /* | |
1050 | * use the del field to tell if we need to go ahead and | |
1051 | * free up the extent when we delete the item or not. | |
1052 | */ | |
1053 | tmp->del = ret; | |
1054 | bytes_freed += tmp->num_bytes; | |
1055 | ||
1056 | num_to_del += 2; | |
1057 | cur_slot += 2; | |
1058 | } | |
1059 | end = pos; | |
1060 | ||
1061 | /* update the free space counters */ | |
1062 | spin_lock_irq(&info->delalloc_lock); | |
1063 | super_used = btrfs_super_bytes_used(&info->super_copy); | |
1064 | btrfs_set_super_bytes_used(&info->super_copy, | |
1065 | super_used - bytes_freed); | |
1066 | spin_unlock_irq(&info->delalloc_lock); | |
1067 | ||
1068 | root_used = btrfs_root_used(&extent_root->root_item); | |
1069 | btrfs_set_root_used(&extent_root->root_item, | |
1070 | root_used - bytes_freed); | |
1071 | ||
1072 | /* delete the items */ | |
1073 | ret = btrfs_del_items(trans, extent_root, path, | |
1074 | path->slots[0], num_to_del); | |
1075 | BUG_ON(ret); | |
1076 | ||
1077 | /* | |
1078 | * loop through the extents we deleted and do the cleanup work | |
1079 | * on them | |
1080 | */ | |
1081 | for (pos = cur, n = pos->next; pos != end; | |
1082 | pos = n, n = pos->next) { | |
1083 | struct pending_extent_op *tmp; | |
1084 | #ifdef BIO_RW_DISCARD | |
1085 | u64 map_length; | |
1086 | struct btrfs_multi_bio *multi = NULL; | |
1087 | #endif | |
1088 | tmp = list_entry(pos, struct pending_extent_op, list); | |
1089 | ||
1090 | /* | |
1091 | * remember tmp->del tells us wether or not we pinned | |
1092 | * down the extent | |
1093 | */ | |
1094 | ret = update_block_group(trans, extent_root, | |
1095 | tmp->bytenr, tmp->num_bytes, 0, | |
1096 | tmp->del); | |
1097 | BUG_ON(ret); | |
1098 | ||
1099 | #ifdef BIO_RW_DISCARD | |
1100 | ret = btrfs_map_block(&info->mapping_tree, READ, | |
1101 | tmp->bytenr, &map_length, &multi, | |
1102 | 0); | |
1103 | if (!ret) { | |
1104 | struct btrfs_bio_stripe *stripe; | |
1105 | int i; | |
1106 | ||
1107 | stripe = multi->stripe; | |
1108 | ||
1109 | if (map_length > tmp->num_bytes) | |
1110 | map_length = tmp->num_bytes; | |
1111 | ||
1112 | for (i = 0; i < multi->num_stripes; | |
1113 | i++, stripe++) | |
1114 | blkdev_issue_discard(stripe->dev->bdev, | |
1115 | stripe->physical >> 9, | |
1116 | map_length >> 9); | |
1117 | kfree(multi); | |
1118 | } | |
1119 | #endif | |
1120 | list_del_init(&tmp->list); | |
1121 | unlock_extent(&info->extent_ins, tmp->bytenr, | |
1122 | tmp->bytenr + tmp->num_bytes - 1, | |
1123 | GFP_NOFS); | |
1124 | kfree(tmp); | |
1125 | } | |
1126 | } else if (refs && found_extent) { | |
1127 | /* | |
1128 | * the ref and extent were right next to eachother, but the | |
1129 | * extent still has a ref, so just free the backref and keep | |
1130 | * going | |
1131 | */ | |
1132 | ret = remove_extent_backref(trans, extent_root, path); | |
1133 | BUG_ON(ret); | |
1134 | ||
1135 | list_del_init(&op->list); | |
1136 | unlock_extent(&info->extent_ins, op->bytenr, | |
1137 | op->bytenr + op->num_bytes - 1, GFP_NOFS); | |
1138 | kfree(op); | |
1139 | } else { | |
1140 | /* | |
1141 | * the extent has multiple refs and the backref we were looking | |
1142 | * for was not right next to it, so just unlock and go next, | |
1143 | * we're good to go | |
1144 | */ | |
1145 | list_del_init(&op->list); | |
1146 | unlock_extent(&info->extent_ins, op->bytenr, | |
1147 | op->bytenr + op->num_bytes - 1, GFP_NOFS); | |
1148 | kfree(op); | |
1149 | } | |
1150 | ||
1151 | btrfs_release_path(extent_root, path); | |
1152 | if (!list_empty(del_list)) | |
1153 | goto search; | |
1154 | ||
1155 | out: | |
1156 | btrfs_free_path(path); | |
1157 | return ret; | |
1158 | } | |
1159 | ||
31840ae1 ZY |
1160 | static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
1161 | struct btrfs_root *root, u64 bytenr, | |
1162 | u64 orig_parent, u64 parent, | |
1163 | u64 orig_root, u64 ref_root, | |
1164 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 1165 | u64 owner_objectid) |
31840ae1 ZY |
1166 | { |
1167 | int ret; | |
1168 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
1169 | struct btrfs_path *path; | |
1170 | ||
1171 | if (root == root->fs_info->extent_root) { | |
1172 | struct pending_extent_op *extent_op; | |
1173 | u64 num_bytes; | |
1174 | ||
1175 | BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL); | |
1176 | num_bytes = btrfs_level_size(root, (int)owner_objectid); | |
25179201 | 1177 | mutex_lock(&root->fs_info->extent_ins_mutex); |
31840ae1 | 1178 | if (test_range_bit(&root->fs_info->extent_ins, bytenr, |
25179201 | 1179 | bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) { |
31840ae1 ZY |
1180 | u64 priv; |
1181 | ret = get_state_private(&root->fs_info->extent_ins, | |
1182 | bytenr, &priv); | |
1183 | BUG_ON(ret); | |
1184 | extent_op = (struct pending_extent_op *) | |
1185 | (unsigned long)priv; | |
1186 | BUG_ON(extent_op->parent != orig_parent); | |
1187 | BUG_ON(extent_op->generation != orig_generation); | |
25179201 | 1188 | |
31840ae1 ZY |
1189 | extent_op->parent = parent; |
1190 | extent_op->generation = ref_generation; | |
1191 | } else { | |
1192 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
1193 | BUG_ON(!extent_op); | |
1194 | ||
1195 | extent_op->type = PENDING_BACKREF_UPDATE; | |
1196 | extent_op->bytenr = bytenr; | |
1197 | extent_op->num_bytes = num_bytes; | |
1198 | extent_op->parent = parent; | |
1199 | extent_op->orig_parent = orig_parent; | |
1200 | extent_op->generation = ref_generation; | |
1201 | extent_op->orig_generation = orig_generation; | |
1202 | extent_op->level = (int)owner_objectid; | |
f3465ca4 JB |
1203 | INIT_LIST_HEAD(&extent_op->list); |
1204 | extent_op->del = 0; | |
31840ae1 ZY |
1205 | |
1206 | set_extent_bits(&root->fs_info->extent_ins, | |
1207 | bytenr, bytenr + num_bytes - 1, | |
25179201 | 1208 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
1209 | set_state_private(&root->fs_info->extent_ins, |
1210 | bytenr, (unsigned long)extent_op); | |
1211 | } | |
25179201 | 1212 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
31840ae1 ZY |
1213 | return 0; |
1214 | } | |
1215 | ||
1216 | path = btrfs_alloc_path(); | |
1217 | if (!path) | |
1218 | return -ENOMEM; | |
1219 | ret = lookup_extent_backref(trans, extent_root, path, | |
1220 | bytenr, orig_parent, orig_root, | |
3bb1a1bc | 1221 | orig_generation, owner_objectid, 1); |
31840ae1 ZY |
1222 | if (ret) |
1223 | goto out; | |
1224 | ret = remove_extent_backref(trans, extent_root, path); | |
1225 | if (ret) | |
1226 | goto out; | |
1227 | ret = insert_extent_backref(trans, extent_root, path, bytenr, | |
1228 | parent, ref_root, ref_generation, | |
3bb1a1bc | 1229 | owner_objectid); |
31840ae1 | 1230 | BUG_ON(ret); |
87ef2bb4 CM |
1231 | finish_current_insert(trans, extent_root, 0); |
1232 | del_pending_extents(trans, extent_root, 0); | |
31840ae1 ZY |
1233 | out: |
1234 | btrfs_free_path(path); | |
1235 | return ret; | |
1236 | } | |
1237 | ||
1238 | int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, | |
1239 | struct btrfs_root *root, u64 bytenr, | |
1240 | u64 orig_parent, u64 parent, | |
1241 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 1242 | u64 owner_objectid) |
31840ae1 ZY |
1243 | { |
1244 | int ret; | |
1245 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && | |
1246 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
1247 | return 0; | |
31840ae1 ZY |
1248 | ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent, |
1249 | parent, ref_root, ref_root, | |
1250 | ref_generation, ref_generation, | |
3bb1a1bc | 1251 | owner_objectid); |
31840ae1 ZY |
1252 | return ret; |
1253 | } | |
1254 | ||
925baedd | 1255 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
1256 | struct btrfs_root *root, u64 bytenr, |
1257 | u64 orig_parent, u64 parent, | |
1258 | u64 orig_root, u64 ref_root, | |
1259 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 1260 | u64 owner_objectid) |
02217ed2 | 1261 | { |
5caf2a00 | 1262 | struct btrfs_path *path; |
02217ed2 | 1263 | int ret; |
e2fa7227 | 1264 | struct btrfs_key key; |
5f39d397 | 1265 | struct extent_buffer *l; |
234b63a0 | 1266 | struct btrfs_extent_item *item; |
cf27e1ee | 1267 | u32 refs; |
037e6390 | 1268 | |
5caf2a00 | 1269 | path = btrfs_alloc_path(); |
54aa1f4d CM |
1270 | if (!path) |
1271 | return -ENOMEM; | |
26b8003f | 1272 | |
3c12ac72 | 1273 | path->reada = 1; |
db94535d | 1274 | key.objectid = bytenr; |
31840ae1 ZY |
1275 | key.type = BTRFS_EXTENT_ITEM_KEY; |
1276 | key.offset = (u64)-1; | |
1277 | ||
5caf2a00 | 1278 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 1279 | 0, 1); |
54aa1f4d CM |
1280 | if (ret < 0) |
1281 | return ret; | |
31840ae1 ZY |
1282 | BUG_ON(ret == 0 || path->slots[0] == 0); |
1283 | ||
1284 | path->slots[0]--; | |
5f39d397 | 1285 | l = path->nodes[0]; |
31840ae1 ZY |
1286 | |
1287 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
771ed689 CM |
1288 | if (key.objectid != bytenr) { |
1289 | btrfs_print_leaf(root->fs_info->extent_root, path->nodes[0]); | |
1290 | printk("wanted %Lu found %Lu\n", bytenr, key.objectid); | |
1291 | BUG(); | |
1292 | } | |
31840ae1 ZY |
1293 | BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); |
1294 | ||
5caf2a00 | 1295 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 CM |
1296 | refs = btrfs_extent_refs(l, item); |
1297 | btrfs_set_extent_refs(l, item, refs + 1); | |
5caf2a00 | 1298 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 1299 | |
5caf2a00 | 1300 | btrfs_release_path(root->fs_info->extent_root, path); |
7bb86316 | 1301 | |
3c12ac72 | 1302 | path->reada = 1; |
31840ae1 ZY |
1303 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
1304 | path, bytenr, parent, | |
1305 | ref_root, ref_generation, | |
3bb1a1bc | 1306 | owner_objectid); |
7bb86316 | 1307 | BUG_ON(ret); |
87ef2bb4 CM |
1308 | finish_current_insert(trans, root->fs_info->extent_root, 0); |
1309 | del_pending_extents(trans, root->fs_info->extent_root, 0); | |
74493f7a CM |
1310 | |
1311 | btrfs_free_path(path); | |
02217ed2 CM |
1312 | return 0; |
1313 | } | |
1314 | ||
925baedd | 1315 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
1316 | struct btrfs_root *root, |
1317 | u64 bytenr, u64 num_bytes, u64 parent, | |
1318 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 1319 | u64 owner_objectid) |
925baedd CM |
1320 | { |
1321 | int ret; | |
31840ae1 ZY |
1322 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && |
1323 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
1324 | return 0; | |
31840ae1 ZY |
1325 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent, |
1326 | 0, ref_root, 0, ref_generation, | |
3bb1a1bc | 1327 | owner_objectid); |
925baedd CM |
1328 | return ret; |
1329 | } | |
1330 | ||
e9d0b13b CM |
1331 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
1332 | struct btrfs_root *root) | |
1333 | { | |
87ef2bb4 CM |
1334 | finish_current_insert(trans, root->fs_info->extent_root, 1); |
1335 | del_pending_extents(trans, root->fs_info->extent_root, 1); | |
e9d0b13b CM |
1336 | return 0; |
1337 | } | |
1338 | ||
31840ae1 ZY |
1339 | int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans, |
1340 | struct btrfs_root *root, u64 bytenr, | |
1341 | u64 num_bytes, u32 *refs) | |
a28ec197 | 1342 | { |
5caf2a00 | 1343 | struct btrfs_path *path; |
a28ec197 | 1344 | int ret; |
e2fa7227 | 1345 | struct btrfs_key key; |
5f39d397 | 1346 | struct extent_buffer *l; |
234b63a0 | 1347 | struct btrfs_extent_item *item; |
5caf2a00 | 1348 | |
db94535d | 1349 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 1350 | path = btrfs_alloc_path(); |
3c12ac72 | 1351 | path->reada = 1; |
db94535d CM |
1352 | key.objectid = bytenr; |
1353 | key.offset = num_bytes; | |
62e2749e | 1354 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
5caf2a00 | 1355 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 1356 | 0, 0); |
54aa1f4d CM |
1357 | if (ret < 0) |
1358 | goto out; | |
5f39d397 CM |
1359 | if (ret != 0) { |
1360 | btrfs_print_leaf(root, path->nodes[0]); | |
db94535d | 1361 | printk("failed to find block number %Lu\n", bytenr); |
a28ec197 | 1362 | BUG(); |
5f39d397 CM |
1363 | } |
1364 | l = path->nodes[0]; | |
5caf2a00 | 1365 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 | 1366 | *refs = btrfs_extent_refs(l, item); |
54aa1f4d | 1367 | out: |
5caf2a00 | 1368 | btrfs_free_path(path); |
a28ec197 CM |
1369 | return 0; |
1370 | } | |
1371 | ||
80ff3856 YZ |
1372 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
1373 | struct btrfs_root *root, u64 bytenr) | |
be20aa9d CM |
1374 | { |
1375 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
1376 | struct btrfs_path *path; | |
f321e491 YZ |
1377 | struct extent_buffer *leaf; |
1378 | struct btrfs_extent_ref *ref_item; | |
1379 | struct btrfs_key key; | |
1380 | struct btrfs_key found_key; | |
80ff3856 YZ |
1381 | u64 ref_root; |
1382 | u64 last_snapshot; | |
be20aa9d CM |
1383 | u32 nritems; |
1384 | int ret; | |
925baedd | 1385 | |
be20aa9d | 1386 | key.objectid = bytenr; |
31840ae1 | 1387 | key.offset = (u64)-1; |
f321e491 | 1388 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 1389 | |
f321e491 | 1390 | path = btrfs_alloc_path(); |
be20aa9d CM |
1391 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
1392 | if (ret < 0) | |
1393 | goto out; | |
1394 | BUG_ON(ret == 0); | |
80ff3856 YZ |
1395 | |
1396 | ret = -ENOENT; | |
1397 | if (path->slots[0] == 0) | |
31840ae1 | 1398 | goto out; |
be20aa9d | 1399 | |
31840ae1 | 1400 | path->slots[0]--; |
f321e491 YZ |
1401 | leaf = path->nodes[0]; |
1402 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
be20aa9d CM |
1403 | |
1404 | if (found_key.objectid != bytenr || | |
80ff3856 | 1405 | found_key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 1406 | goto out; |
f321e491 | 1407 | |
80ff3856 | 1408 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
be20aa9d | 1409 | while (1) { |
f321e491 YZ |
1410 | leaf = path->nodes[0]; |
1411 | nritems = btrfs_header_nritems(leaf); | |
be20aa9d CM |
1412 | if (path->slots[0] >= nritems) { |
1413 | ret = btrfs_next_leaf(extent_root, path); | |
f321e491 YZ |
1414 | if (ret < 0) |
1415 | goto out; | |
be20aa9d CM |
1416 | if (ret == 0) |
1417 | continue; | |
1418 | break; | |
1419 | } | |
f321e491 | 1420 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
be20aa9d CM |
1421 | if (found_key.objectid != bytenr) |
1422 | break; | |
bd09835d | 1423 | |
be20aa9d CM |
1424 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
1425 | path->slots[0]++; | |
1426 | continue; | |
1427 | } | |
1428 | ||
f321e491 | 1429 | ref_item = btrfs_item_ptr(leaf, path->slots[0], |
be20aa9d | 1430 | struct btrfs_extent_ref); |
80ff3856 YZ |
1431 | ref_root = btrfs_ref_root(leaf, ref_item); |
1432 | if (ref_root != root->root_key.objectid && | |
1433 | ref_root != BTRFS_TREE_LOG_OBJECTID) { | |
1434 | ret = 1; | |
f321e491 | 1435 | goto out; |
80ff3856 YZ |
1436 | } |
1437 | if (btrfs_ref_generation(leaf, ref_item) <= last_snapshot) { | |
f321e491 YZ |
1438 | ret = 1; |
1439 | goto out; | |
1440 | } | |
80ff3856 YZ |
1441 | |
1442 | path->slots[0]++; | |
f321e491 YZ |
1443 | } |
1444 | ret = 0; | |
be20aa9d | 1445 | out: |
80ff3856 | 1446 | btrfs_free_path(path); |
f321e491 | 1447 | return ret; |
be20aa9d | 1448 | } |
c5739bba | 1449 | |
31840ae1 ZY |
1450 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
1451 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 1452 | { |
5f39d397 | 1453 | struct btrfs_key key; |
6407bf6d | 1454 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
1455 | u64 root_gen; |
1456 | u32 nritems; | |
02217ed2 | 1457 | int i; |
db94535d | 1458 | int level; |
31840ae1 | 1459 | int ret = 0; |
e4657689 | 1460 | int shared = 0; |
a28ec197 | 1461 | |
3768f368 | 1462 | if (!root->ref_cows) |
a28ec197 | 1463 | return 0; |
5f39d397 | 1464 | |
e4657689 ZY |
1465 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
1466 | shared = 0; | |
1467 | root_gen = root->root_key.offset; | |
1468 | } else { | |
1469 | shared = 1; | |
1470 | root_gen = trans->transid - 1; | |
1471 | } | |
1472 | ||
db94535d | 1473 | level = btrfs_header_level(buf); |
5f39d397 | 1474 | nritems = btrfs_header_nritems(buf); |
4a096752 | 1475 | |
31840ae1 | 1476 | if (level == 0) { |
31153d81 YZ |
1477 | struct btrfs_leaf_ref *ref; |
1478 | struct btrfs_extent_info *info; | |
1479 | ||
31840ae1 | 1480 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 1481 | if (!ref) { |
31840ae1 | 1482 | ret = -ENOMEM; |
31153d81 YZ |
1483 | goto out; |
1484 | } | |
1485 | ||
e4657689 | 1486 | ref->root_gen = root_gen; |
31153d81 YZ |
1487 | ref->bytenr = buf->start; |
1488 | ref->owner = btrfs_header_owner(buf); | |
1489 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 1490 | ref->nritems = nr_extents; |
31153d81 | 1491 | info = ref->extents; |
bcc63abb | 1492 | |
31840ae1 | 1493 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
1494 | u64 disk_bytenr; |
1495 | btrfs_item_key_to_cpu(buf, &key, i); | |
1496 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1497 | continue; | |
1498 | fi = btrfs_item_ptr(buf, i, | |
1499 | struct btrfs_file_extent_item); | |
1500 | if (btrfs_file_extent_type(buf, fi) == | |
1501 | BTRFS_FILE_EXTENT_INLINE) | |
1502 | continue; | |
1503 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1504 | if (disk_bytenr == 0) | |
1505 | continue; | |
1506 | ||
1507 | info->bytenr = disk_bytenr; | |
1508 | info->num_bytes = | |
1509 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
1510 | info->objectid = key.objectid; | |
1511 | info->offset = key.offset; | |
1512 | info++; | |
1513 | } | |
1514 | ||
e4657689 | 1515 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
1516 | if (ret == -EEXIST && shared) { |
1517 | struct btrfs_leaf_ref *old; | |
1518 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
1519 | BUG_ON(!old); | |
1520 | btrfs_remove_leaf_ref(root, old); | |
1521 | btrfs_free_leaf_ref(root, old); | |
1522 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
1523 | } | |
31153d81 | 1524 | WARN_ON(ret); |
bcc63abb | 1525 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
1526 | } |
1527 | out: | |
31840ae1 ZY |
1528 | return ret; |
1529 | } | |
1530 | ||
1531 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
1532 | struct extent_buffer *orig_buf, struct extent_buffer *buf, | |
1533 | u32 *nr_extents) | |
1534 | { | |
1535 | u64 bytenr; | |
1536 | u64 ref_root; | |
1537 | u64 orig_root; | |
1538 | u64 ref_generation; | |
1539 | u64 orig_generation; | |
1540 | u32 nritems; | |
1541 | u32 nr_file_extents = 0; | |
1542 | struct btrfs_key key; | |
1543 | struct btrfs_file_extent_item *fi; | |
1544 | int i; | |
1545 | int level; | |
1546 | int ret = 0; | |
1547 | int faili = 0; | |
1548 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, | |
3bb1a1bc | 1549 | u64, u64, u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
1550 | |
1551 | ref_root = btrfs_header_owner(buf); | |
1552 | ref_generation = btrfs_header_generation(buf); | |
1553 | orig_root = btrfs_header_owner(orig_buf); | |
1554 | orig_generation = btrfs_header_generation(orig_buf); | |
1555 | ||
1556 | nritems = btrfs_header_nritems(buf); | |
1557 | level = btrfs_header_level(buf); | |
1558 | ||
1559 | if (root->ref_cows) { | |
1560 | process_func = __btrfs_inc_extent_ref; | |
1561 | } else { | |
1562 | if (level == 0 && | |
1563 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1564 | goto out; | |
1565 | if (level != 0 && | |
1566 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1567 | goto out; | |
1568 | process_func = __btrfs_update_extent_ref; | |
1569 | } | |
1570 | ||
1571 | for (i = 0; i < nritems; i++) { | |
1572 | cond_resched(); | |
db94535d | 1573 | if (level == 0) { |
5f39d397 CM |
1574 | btrfs_item_key_to_cpu(buf, &key, i); |
1575 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 1576 | continue; |
5f39d397 | 1577 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 1578 | struct btrfs_file_extent_item); |
5f39d397 | 1579 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
1580 | BTRFS_FILE_EXTENT_INLINE) |
1581 | continue; | |
31840ae1 ZY |
1582 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
1583 | if (bytenr == 0) | |
54aa1f4d | 1584 | continue; |
31840ae1 ZY |
1585 | |
1586 | nr_file_extents++; | |
1587 | ||
31840ae1 ZY |
1588 | ret = process_func(trans, root, bytenr, |
1589 | orig_buf->start, buf->start, | |
1590 | orig_root, ref_root, | |
1591 | orig_generation, ref_generation, | |
3bb1a1bc | 1592 | key.objectid); |
31840ae1 ZY |
1593 | |
1594 | if (ret) { | |
1595 | faili = i; | |
1596 | WARN_ON(1); | |
1597 | goto fail; | |
1598 | } | |
54aa1f4d | 1599 | } else { |
db94535d | 1600 | bytenr = btrfs_node_blockptr(buf, i); |
31840ae1 ZY |
1601 | ret = process_func(trans, root, bytenr, |
1602 | orig_buf->start, buf->start, | |
1603 | orig_root, ref_root, | |
1604 | orig_generation, ref_generation, | |
3bb1a1bc | 1605 | level - 1); |
31840ae1 ZY |
1606 | if (ret) { |
1607 | faili = i; | |
1608 | WARN_ON(1); | |
1609 | goto fail; | |
1610 | } | |
54aa1f4d CM |
1611 | } |
1612 | } | |
31840ae1 ZY |
1613 | out: |
1614 | if (nr_extents) { | |
1615 | if (level == 0) | |
1616 | *nr_extents = nr_file_extents; | |
1617 | else | |
1618 | *nr_extents = nritems; | |
1619 | } | |
1620 | return 0; | |
1621 | fail: | |
1622 | WARN_ON(1); | |
54aa1f4d | 1623 | return ret; |
02217ed2 CM |
1624 | } |
1625 | ||
31840ae1 ZY |
1626 | int btrfs_update_ref(struct btrfs_trans_handle *trans, |
1627 | struct btrfs_root *root, struct extent_buffer *orig_buf, | |
1628 | struct extent_buffer *buf, int start_slot, int nr) | |
1629 | ||
1630 | { | |
1631 | u64 bytenr; | |
1632 | u64 ref_root; | |
1633 | u64 orig_root; | |
1634 | u64 ref_generation; | |
1635 | u64 orig_generation; | |
1636 | struct btrfs_key key; | |
1637 | struct btrfs_file_extent_item *fi; | |
1638 | int i; | |
1639 | int ret; | |
1640 | int slot; | |
1641 | int level; | |
1642 | ||
1643 | BUG_ON(start_slot < 0); | |
1644 | BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); | |
1645 | ||
1646 | ref_root = btrfs_header_owner(buf); | |
1647 | ref_generation = btrfs_header_generation(buf); | |
1648 | orig_root = btrfs_header_owner(orig_buf); | |
1649 | orig_generation = btrfs_header_generation(orig_buf); | |
1650 | level = btrfs_header_level(buf); | |
1651 | ||
1652 | if (!root->ref_cows) { | |
1653 | if (level == 0 && | |
1654 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1655 | return 0; | |
1656 | if (level != 0 && | |
1657 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | for (i = 0, slot = start_slot; i < nr; i++, slot++) { | |
1662 | cond_resched(); | |
1663 | if (level == 0) { | |
1664 | btrfs_item_key_to_cpu(buf, &key, slot); | |
1665 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1666 | continue; | |
1667 | fi = btrfs_item_ptr(buf, slot, | |
1668 | struct btrfs_file_extent_item); | |
1669 | if (btrfs_file_extent_type(buf, fi) == | |
1670 | BTRFS_FILE_EXTENT_INLINE) | |
1671 | continue; | |
1672 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1673 | if (bytenr == 0) | |
1674 | continue; | |
31840ae1 ZY |
1675 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
1676 | orig_buf->start, buf->start, | |
1677 | orig_root, ref_root, | |
1678 | orig_generation, ref_generation, | |
3bb1a1bc | 1679 | key.objectid); |
31840ae1 ZY |
1680 | if (ret) |
1681 | goto fail; | |
1682 | } else { | |
1683 | bytenr = btrfs_node_blockptr(buf, slot); | |
31840ae1 ZY |
1684 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
1685 | orig_buf->start, buf->start, | |
1686 | orig_root, ref_root, | |
1687 | orig_generation, ref_generation, | |
3bb1a1bc | 1688 | level - 1); |
31840ae1 ZY |
1689 | if (ret) |
1690 | goto fail; | |
1691 | } | |
1692 | } | |
1693 | return 0; | |
1694 | fail: | |
1695 | WARN_ON(1); | |
1696 | return -1; | |
1697 | } | |
1698 | ||
9078a3e1 CM |
1699 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
1700 | struct btrfs_root *root, | |
1701 | struct btrfs_path *path, | |
1702 | struct btrfs_block_group_cache *cache) | |
1703 | { | |
1704 | int ret; | |
1705 | int pending_ret; | |
1706 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
5f39d397 CM |
1707 | unsigned long bi; |
1708 | struct extent_buffer *leaf; | |
9078a3e1 | 1709 | |
9078a3e1 | 1710 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
1711 | if (ret < 0) |
1712 | goto fail; | |
9078a3e1 | 1713 | BUG_ON(ret); |
5f39d397 CM |
1714 | |
1715 | leaf = path->nodes[0]; | |
1716 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1717 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
1718 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 1719 | btrfs_release_path(extent_root, path); |
54aa1f4d | 1720 | fail: |
87ef2bb4 CM |
1721 | finish_current_insert(trans, extent_root, 0); |
1722 | pending_ret = del_pending_extents(trans, extent_root, 0); | |
9078a3e1 CM |
1723 | if (ret) |
1724 | return ret; | |
1725 | if (pending_ret) | |
1726 | return pending_ret; | |
1727 | return 0; | |
1728 | ||
1729 | } | |
1730 | ||
96b5179d CM |
1731 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
1732 | struct btrfs_root *root) | |
9078a3e1 | 1733 | { |
0f9dd46c JB |
1734 | struct btrfs_block_group_cache *cache, *entry; |
1735 | struct rb_node *n; | |
9078a3e1 CM |
1736 | int err = 0; |
1737 | int werr = 0; | |
9078a3e1 | 1738 | struct btrfs_path *path; |
96b5179d | 1739 | u64 last = 0; |
9078a3e1 CM |
1740 | |
1741 | path = btrfs_alloc_path(); | |
1742 | if (!path) | |
1743 | return -ENOMEM; | |
1744 | ||
1745 | while(1) { | |
0f9dd46c JB |
1746 | cache = NULL; |
1747 | spin_lock(&root->fs_info->block_group_cache_lock); | |
1748 | for (n = rb_first(&root->fs_info->block_group_cache_tree); | |
1749 | n; n = rb_next(n)) { | |
1750 | entry = rb_entry(n, struct btrfs_block_group_cache, | |
1751 | cache_node); | |
1752 | if (entry->dirty) { | |
1753 | cache = entry; | |
1754 | break; | |
1755 | } | |
1756 | } | |
1757 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
54aa1f4d | 1758 | |
0f9dd46c | 1759 | if (!cache) |
96b5179d | 1760 | break; |
0f9dd46c | 1761 | |
e8569813 | 1762 | cache->dirty = 0; |
0f9dd46c JB |
1763 | last += cache->key.offset; |
1764 | ||
96b5179d CM |
1765 | err = write_one_cache_group(trans, root, |
1766 | path, cache); | |
1767 | /* | |
1768 | * if we fail to write the cache group, we want | |
1769 | * to keep it marked dirty in hopes that a later | |
1770 | * write will work | |
1771 | */ | |
1772 | if (err) { | |
1773 | werr = err; | |
1774 | continue; | |
9078a3e1 CM |
1775 | } |
1776 | } | |
1777 | btrfs_free_path(path); | |
1778 | return werr; | |
1779 | } | |
1780 | ||
593060d7 CM |
1781 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1782 | u64 total_bytes, u64 bytes_used, | |
1783 | struct btrfs_space_info **space_info) | |
1784 | { | |
1785 | struct btrfs_space_info *found; | |
1786 | ||
1787 | found = __find_space_info(info, flags); | |
1788 | if (found) { | |
25179201 | 1789 | spin_lock(&found->lock); |
593060d7 CM |
1790 | found->total_bytes += total_bytes; |
1791 | found->bytes_used += bytes_used; | |
8f18cf13 | 1792 | found->full = 0; |
25179201 | 1793 | spin_unlock(&found->lock); |
593060d7 CM |
1794 | *space_info = found; |
1795 | return 0; | |
1796 | } | |
c146afad | 1797 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
1798 | if (!found) |
1799 | return -ENOMEM; | |
1800 | ||
1801 | list_add(&found->list, &info->space_info); | |
0f9dd46c | 1802 | INIT_LIST_HEAD(&found->block_groups); |
80eb234a | 1803 | init_rwsem(&found->groups_sem); |
0f9dd46c | 1804 | spin_lock_init(&found->lock); |
593060d7 CM |
1805 | found->flags = flags; |
1806 | found->total_bytes = total_bytes; | |
1807 | found->bytes_used = bytes_used; | |
1808 | found->bytes_pinned = 0; | |
e8569813 | 1809 | found->bytes_reserved = 0; |
c146afad | 1810 | found->bytes_readonly = 0; |
593060d7 | 1811 | found->full = 0; |
0ef3e66b | 1812 | found->force_alloc = 0; |
593060d7 CM |
1813 | *space_info = found; |
1814 | return 0; | |
1815 | } | |
1816 | ||
8790d502 CM |
1817 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1818 | { | |
1819 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1820 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1821 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1822 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1823 | if (extra_flags) { |
1824 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1825 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1826 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1827 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1828 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1829 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1830 | } | |
1831 | } | |
593060d7 | 1832 | |
c146afad YZ |
1833 | static void set_block_group_readonly(struct btrfs_block_group_cache *cache) |
1834 | { | |
1835 | spin_lock(&cache->space_info->lock); | |
1836 | spin_lock(&cache->lock); | |
1837 | if (!cache->ro) { | |
1838 | cache->space_info->bytes_readonly += cache->key.offset - | |
1839 | btrfs_block_group_used(&cache->item); | |
1840 | cache->ro = 1; | |
1841 | } | |
1842 | spin_unlock(&cache->lock); | |
1843 | spin_unlock(&cache->space_info->lock); | |
1844 | } | |
1845 | ||
a061fc8d | 1846 | static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1847 | { |
a061fc8d CM |
1848 | u64 num_devices = root->fs_info->fs_devices->num_devices; |
1849 | ||
1850 | if (num_devices == 1) | |
1851 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1852 | if (num_devices < 4) | |
1853 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1854 | ||
ec44a35c CM |
1855 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1856 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1857 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1858 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1859 | } |
ec44a35c CM |
1860 | |
1861 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1862 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1863 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1864 | } |
ec44a35c CM |
1865 | |
1866 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1867 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1868 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1869 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1870 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1871 | return flags; | |
1872 | } | |
1873 | ||
6324fbf3 CM |
1874 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1875 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 1876 | u64 flags, int force) |
6324fbf3 CM |
1877 | { |
1878 | struct btrfs_space_info *space_info; | |
1879 | u64 thresh; | |
1880 | u64 start; | |
1881 | u64 num_bytes; | |
c146afad YZ |
1882 | int ret = 0; |
1883 | ||
1884 | mutex_lock(&extent_root->fs_info->chunk_mutex); | |
6324fbf3 | 1885 | |
a061fc8d | 1886 | flags = reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1887 | |
6324fbf3 | 1888 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1889 | if (!space_info) { |
1890 | ret = update_space_info(extent_root->fs_info, flags, | |
1891 | 0, 0, &space_info); | |
1892 | BUG_ON(ret); | |
1893 | } | |
6324fbf3 CM |
1894 | BUG_ON(!space_info); |
1895 | ||
25179201 | 1896 | spin_lock(&space_info->lock); |
0ef3e66b CM |
1897 | if (space_info->force_alloc) { |
1898 | force = 1; | |
1899 | space_info->force_alloc = 0; | |
1900 | } | |
25179201 JB |
1901 | if (space_info->full) { |
1902 | spin_unlock(&space_info->lock); | |
925baedd | 1903 | goto out; |
25179201 | 1904 | } |
6324fbf3 | 1905 | |
c146afad YZ |
1906 | thresh = space_info->total_bytes - space_info->bytes_readonly; |
1907 | thresh = div_factor(thresh, 6); | |
0ef3e66b | 1908 | if (!force && |
e8569813 | 1909 | (space_info->bytes_used + space_info->bytes_pinned + |
25179201 JB |
1910 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
1911 | spin_unlock(&space_info->lock); | |
925baedd | 1912 | goto out; |
25179201 | 1913 | } |
25179201 JB |
1914 | spin_unlock(&space_info->lock); |
1915 | ||
6324fbf3 | 1916 | ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags); |
25179201 | 1917 | if (ret) { |
6324fbf3 CM |
1918 | printk("space info full %Lu\n", flags); |
1919 | space_info->full = 1; | |
c146afad | 1920 | goto out; |
6324fbf3 | 1921 | } |
6324fbf3 CM |
1922 | |
1923 | ret = btrfs_make_block_group(trans, extent_root, 0, flags, | |
e17cade2 | 1924 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes); |
6324fbf3 | 1925 | BUG_ON(ret); |
a74a4b97 | 1926 | out: |
c146afad | 1927 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 1928 | return ret; |
6324fbf3 CM |
1929 | } |
1930 | ||
9078a3e1 CM |
1931 | static int update_block_group(struct btrfs_trans_handle *trans, |
1932 | struct btrfs_root *root, | |
db94535d | 1933 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 1934 | int mark_free) |
9078a3e1 CM |
1935 | { |
1936 | struct btrfs_block_group_cache *cache; | |
1937 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 1938 | u64 total = num_bytes; |
9078a3e1 | 1939 | u64 old_val; |
db94535d | 1940 | u64 byte_in_group; |
3e1ad54f | 1941 | |
9078a3e1 | 1942 | while(total) { |
db94535d | 1943 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 1944 | if (!cache) |
9078a3e1 | 1945 | return -1; |
db94535d CM |
1946 | byte_in_group = bytenr - cache->key.objectid; |
1947 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 1948 | |
25179201 | 1949 | spin_lock(&cache->space_info->lock); |
c286ac48 | 1950 | spin_lock(&cache->lock); |
0f9dd46c | 1951 | cache->dirty = 1; |
9078a3e1 | 1952 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 1953 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 1954 | if (alloc) { |
db94535d | 1955 | old_val += num_bytes; |
6324fbf3 | 1956 | cache->space_info->bytes_used += num_bytes; |
c146afad YZ |
1957 | if (cache->ro) { |
1958 | cache->space_info->bytes_readonly -= num_bytes; | |
1959 | WARN_ON(1); | |
1960 | } | |
c286ac48 CM |
1961 | btrfs_set_block_group_used(&cache->item, old_val); |
1962 | spin_unlock(&cache->lock); | |
25179201 | 1963 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 1964 | } else { |
db94535d | 1965 | old_val -= num_bytes; |
6324fbf3 | 1966 | cache->space_info->bytes_used -= num_bytes; |
c146afad YZ |
1967 | if (cache->ro) |
1968 | cache->space_info->bytes_readonly += num_bytes; | |
c286ac48 CM |
1969 | btrfs_set_block_group_used(&cache->item, old_val); |
1970 | spin_unlock(&cache->lock); | |
25179201 | 1971 | spin_unlock(&cache->space_info->lock); |
f510cfec | 1972 | if (mark_free) { |
0f9dd46c JB |
1973 | int ret; |
1974 | ret = btrfs_add_free_space(cache, bytenr, | |
1975 | num_bytes); | |
1976 | if (ret) | |
1977 | return -1; | |
e37c9e69 | 1978 | } |
cd1bc465 | 1979 | } |
db94535d CM |
1980 | total -= num_bytes; |
1981 | bytenr += num_bytes; | |
9078a3e1 CM |
1982 | } |
1983 | return 0; | |
1984 | } | |
6324fbf3 | 1985 | |
a061fc8d CM |
1986 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
1987 | { | |
0f9dd46c JB |
1988 | struct btrfs_block_group_cache *cache; |
1989 | ||
1990 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
1991 | if (!cache) | |
a061fc8d | 1992 | return 0; |
0f9dd46c JB |
1993 | |
1994 | return cache->key.objectid; | |
a061fc8d CM |
1995 | } |
1996 | ||
e02119d5 | 1997 | int btrfs_update_pinned_extents(struct btrfs_root *root, |
324ae4df Y |
1998 | u64 bytenr, u64 num, int pin) |
1999 | { | |
2000 | u64 len; | |
2001 | struct btrfs_block_group_cache *cache; | |
2002 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2003 | ||
25179201 | 2004 | WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex)); |
324ae4df Y |
2005 | if (pin) { |
2006 | set_extent_dirty(&fs_info->pinned_extents, | |
2007 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2008 | } else { | |
2009 | clear_extent_dirty(&fs_info->pinned_extents, | |
2010 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2011 | } | |
2012 | while (num > 0) { | |
2013 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
e8569813 ZY |
2014 | BUG_ON(!cache); |
2015 | len = min(num, cache->key.offset - | |
2016 | (bytenr - cache->key.objectid)); | |
324ae4df | 2017 | if (pin) { |
25179201 | 2018 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2019 | spin_lock(&cache->lock); |
2020 | cache->pinned += len; | |
2021 | cache->space_info->bytes_pinned += len; | |
2022 | spin_unlock(&cache->lock); | |
25179201 | 2023 | spin_unlock(&cache->space_info->lock); |
324ae4df Y |
2024 | fs_info->total_pinned += len; |
2025 | } else { | |
25179201 | 2026 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2027 | spin_lock(&cache->lock); |
2028 | cache->pinned -= len; | |
2029 | cache->space_info->bytes_pinned -= len; | |
2030 | spin_unlock(&cache->lock); | |
25179201 | 2031 | spin_unlock(&cache->space_info->lock); |
324ae4df Y |
2032 | fs_info->total_pinned -= len; |
2033 | } | |
2034 | bytenr += len; | |
2035 | num -= len; | |
2036 | } | |
2037 | return 0; | |
2038 | } | |
9078a3e1 | 2039 | |
e8569813 ZY |
2040 | static int update_reserved_extents(struct btrfs_root *root, |
2041 | u64 bytenr, u64 num, int reserve) | |
2042 | { | |
2043 | u64 len; | |
2044 | struct btrfs_block_group_cache *cache; | |
2045 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2046 | ||
e8569813 ZY |
2047 | while (num > 0) { |
2048 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
2049 | BUG_ON(!cache); | |
2050 | len = min(num, cache->key.offset - | |
2051 | (bytenr - cache->key.objectid)); | |
25179201 JB |
2052 | |
2053 | spin_lock(&cache->space_info->lock); | |
2054 | spin_lock(&cache->lock); | |
e8569813 | 2055 | if (reserve) { |
e8569813 ZY |
2056 | cache->reserved += len; |
2057 | cache->space_info->bytes_reserved += len; | |
e8569813 | 2058 | } else { |
e8569813 ZY |
2059 | cache->reserved -= len; |
2060 | cache->space_info->bytes_reserved -= len; | |
e8569813 | 2061 | } |
25179201 JB |
2062 | spin_unlock(&cache->lock); |
2063 | spin_unlock(&cache->space_info->lock); | |
e8569813 ZY |
2064 | bytenr += len; |
2065 | num -= len; | |
2066 | } | |
2067 | return 0; | |
2068 | } | |
2069 | ||
d1310b2e | 2070 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 2071 | { |
ccd467d6 | 2072 | u64 last = 0; |
1a5bc167 CM |
2073 | u64 start; |
2074 | u64 end; | |
d1310b2e | 2075 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 2076 | int ret; |
ccd467d6 | 2077 | |
25179201 | 2078 | mutex_lock(&root->fs_info->pinned_mutex); |
ccd467d6 | 2079 | while(1) { |
1a5bc167 CM |
2080 | ret = find_first_extent_bit(pinned_extents, last, |
2081 | &start, &end, EXTENT_DIRTY); | |
2082 | if (ret) | |
ccd467d6 | 2083 | break; |
1a5bc167 CM |
2084 | set_extent_dirty(copy, start, end, GFP_NOFS); |
2085 | last = end + 1; | |
ccd467d6 | 2086 | } |
25179201 | 2087 | mutex_unlock(&root->fs_info->pinned_mutex); |
ccd467d6 CM |
2088 | return 0; |
2089 | } | |
2090 | ||
2091 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
2092 | struct btrfs_root *root, | |
d1310b2e | 2093 | struct extent_io_tree *unpin) |
a28ec197 | 2094 | { |
1a5bc167 CM |
2095 | u64 start; |
2096 | u64 end; | |
a28ec197 | 2097 | int ret; |
0f9dd46c | 2098 | struct btrfs_block_group_cache *cache; |
a28ec197 | 2099 | |
25179201 | 2100 | mutex_lock(&root->fs_info->pinned_mutex); |
a28ec197 | 2101 | while(1) { |
1a5bc167 CM |
2102 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
2103 | EXTENT_DIRTY); | |
2104 | if (ret) | |
a28ec197 | 2105 | break; |
e02119d5 | 2106 | btrfs_update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 | 2107 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
0f9dd46c JB |
2108 | cache = btrfs_lookup_block_group(root->fs_info, start); |
2109 | if (cache->cached) | |
2110 | btrfs_add_free_space(cache, start, end - start + 1); | |
c286ac48 | 2111 | if (need_resched()) { |
25179201 | 2112 | mutex_unlock(&root->fs_info->pinned_mutex); |
c286ac48 | 2113 | cond_resched(); |
25179201 | 2114 | mutex_lock(&root->fs_info->pinned_mutex); |
c286ac48 | 2115 | } |
a28ec197 | 2116 | } |
25179201 | 2117 | mutex_unlock(&root->fs_info->pinned_mutex); |
a28ec197 CM |
2118 | return 0; |
2119 | } | |
2120 | ||
98ed5174 | 2121 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
87ef2bb4 | 2122 | struct btrfs_root *extent_root, int all) |
037e6390 | 2123 | { |
7bb86316 CM |
2124 | u64 start; |
2125 | u64 end; | |
31840ae1 | 2126 | u64 priv; |
25179201 | 2127 | u64 search = 0; |
f3465ca4 | 2128 | u64 skipped = 0; |
7bb86316 CM |
2129 | struct btrfs_fs_info *info = extent_root->fs_info; |
2130 | struct btrfs_path *path; | |
f3465ca4 JB |
2131 | struct pending_extent_op *extent_op, *tmp; |
2132 | struct list_head insert_list, update_list; | |
037e6390 | 2133 | int ret; |
f3465ca4 | 2134 | int num_inserts = 0, max_inserts; |
037e6390 | 2135 | |
7bb86316 | 2136 | path = btrfs_alloc_path(); |
f3465ca4 JB |
2137 | INIT_LIST_HEAD(&insert_list); |
2138 | INIT_LIST_HEAD(&update_list); | |
037e6390 | 2139 | |
f3465ca4 JB |
2140 | max_inserts = extent_root->leafsize / |
2141 | (2 * sizeof(struct btrfs_key) + 2 * sizeof(struct btrfs_item) + | |
2142 | sizeof(struct btrfs_extent_ref) + | |
2143 | sizeof(struct btrfs_extent_item)); | |
2144 | again: | |
2145 | mutex_lock(&info->extent_ins_mutex); | |
2146 | while (1) { | |
25179201 JB |
2147 | ret = find_first_extent_bit(&info->extent_ins, search, &start, |
2148 | &end, EXTENT_WRITEBACK); | |
2149 | if (ret) { | |
f3465ca4 JB |
2150 | if (skipped && all && !num_inserts) { |
2151 | skipped = 0; | |
25179201 JB |
2152 | continue; |
2153 | } | |
f3465ca4 | 2154 | mutex_unlock(&info->extent_ins_mutex); |
26b8003f | 2155 | break; |
25179201 JB |
2156 | } |
2157 | ||
2158 | ret = try_lock_extent(&info->extent_ins, start, end, GFP_NOFS); | |
2159 | if (!ret) { | |
f3465ca4 | 2160 | skipped = 1; |
87ef2bb4 | 2161 | search = end + 1; |
f3465ca4 JB |
2162 | if (need_resched()) { |
2163 | mutex_unlock(&info->extent_ins_mutex); | |
2164 | cond_resched(); | |
2165 | mutex_lock(&info->extent_ins_mutex); | |
2166 | } | |
25179201 JB |
2167 | continue; |
2168 | } | |
26b8003f | 2169 | |
31840ae1 ZY |
2170 | ret = get_state_private(&info->extent_ins, start, &priv); |
2171 | BUG_ON(ret); | |
f3465ca4 | 2172 | extent_op = (struct pending_extent_op *)(unsigned long) priv; |
25179201 | 2173 | |
31840ae1 | 2174 | if (extent_op->type == PENDING_EXTENT_INSERT) { |
f3465ca4 JB |
2175 | num_inserts++; |
2176 | list_add_tail(&extent_op->list, &insert_list); | |
2177 | search = end + 1; | |
2178 | if (num_inserts == max_inserts) { | |
2179 | mutex_unlock(&info->extent_ins_mutex); | |
2180 | break; | |
2181 | } | |
2182 | } else if (extent_op->type == PENDING_BACKREF_UPDATE) { | |
2183 | list_add_tail(&extent_op->list, &update_list); | |
2184 | search = end + 1; | |
2185 | } else { | |
2186 | BUG(); | |
2187 | } | |
2188 | } | |
c286ac48 | 2189 | |
f3465ca4 JB |
2190 | /* |
2191 | * process teh update list, clear the writeback bit for it, and if | |
2192 | * somebody marked this thing for deletion then just unlock it and be | |
2193 | * done, the free_extents will handle it | |
2194 | */ | |
2195 | mutex_lock(&info->extent_ins_mutex); | |
2196 | list_for_each_entry_safe(extent_op, tmp, &update_list, list) { | |
2197 | clear_extent_bits(&info->extent_ins, extent_op->bytenr, | |
2198 | extent_op->bytenr + extent_op->num_bytes - 1, | |
2199 | EXTENT_WRITEBACK, GFP_NOFS); | |
2200 | if (extent_op->del) { | |
2201 | list_del_init(&extent_op->list); | |
2202 | unlock_extent(&info->extent_ins, extent_op->bytenr, | |
2203 | extent_op->bytenr + extent_op->num_bytes | |
2204 | - 1, GFP_NOFS); | |
2205 | kfree(extent_op); | |
2206 | } | |
2207 | } | |
2208 | mutex_unlock(&info->extent_ins_mutex); | |
c286ac48 | 2209 | |
f3465ca4 JB |
2210 | /* |
2211 | * still have things left on the update list, go ahead an update | |
2212 | * everything | |
2213 | */ | |
2214 | if (!list_empty(&update_list)) { | |
2215 | ret = update_backrefs(trans, extent_root, path, &update_list); | |
2216 | BUG_ON(ret); | |
2217 | } | |
c286ac48 | 2218 | |
f3465ca4 JB |
2219 | /* |
2220 | * if no inserts need to be done, but we skipped some extents and we | |
2221 | * need to make sure everything is cleaned then reset everything and | |
2222 | * go back to the beginning | |
2223 | */ | |
2224 | if (!num_inserts && all && skipped) { | |
2225 | search = 0; | |
2226 | skipped = 0; | |
2227 | INIT_LIST_HEAD(&update_list); | |
2228 | INIT_LIST_HEAD(&insert_list); | |
2229 | goto again; | |
2230 | } else if (!num_inserts) { | |
2231 | goto out; | |
2232 | } | |
31840ae1 | 2233 | |
f3465ca4 JB |
2234 | /* |
2235 | * process the insert extents list. Again if we are deleting this | |
2236 | * extent, then just unlock it, pin down the bytes if need be, and be | |
2237 | * done with it. Saves us from having to actually insert the extent | |
2238 | * into the tree and then subsequently come along and delete it | |
2239 | */ | |
2240 | mutex_lock(&info->extent_ins_mutex); | |
2241 | list_for_each_entry_safe(extent_op, tmp, &insert_list, list) { | |
2242 | clear_extent_bits(&info->extent_ins, extent_op->bytenr, | |
2243 | extent_op->bytenr + extent_op->num_bytes - 1, | |
2244 | EXTENT_WRITEBACK, GFP_NOFS); | |
2245 | if (extent_op->del) { | |
2246 | list_del_init(&extent_op->list); | |
2247 | unlock_extent(&info->extent_ins, extent_op->bytenr, | |
2248 | extent_op->bytenr + extent_op->num_bytes | |
2249 | - 1, GFP_NOFS); | |
2250 | ||
2251 | mutex_lock(&extent_root->fs_info->pinned_mutex); | |
2252 | ret = pin_down_bytes(trans, extent_root, | |
2253 | extent_op->bytenr, | |
2254 | extent_op->num_bytes, 0); | |
2255 | mutex_unlock(&extent_root->fs_info->pinned_mutex); | |
2256 | ||
2257 | ret = update_block_group(trans, extent_root, | |
2258 | extent_op->bytenr, | |
2259 | extent_op->num_bytes, | |
2260 | 0, ret > 0); | |
2261 | BUG_ON(ret); | |
2262 | kfree(extent_op); | |
2263 | num_inserts--; | |
d8d5f3e1 | 2264 | } |
f3465ca4 JB |
2265 | } |
2266 | mutex_unlock(&info->extent_ins_mutex); | |
31840ae1 | 2267 | |
f3465ca4 JB |
2268 | ret = insert_extents(trans, extent_root, path, &insert_list, |
2269 | num_inserts); | |
2270 | BUG_ON(ret); | |
2271 | ||
2272 | /* | |
2273 | * if we broke out of the loop in order to insert stuff because we hit | |
2274 | * the maximum number of inserts at a time we can handle, then loop | |
2275 | * back and pick up where we left off | |
2276 | */ | |
2277 | if (num_inserts == max_inserts) { | |
2278 | INIT_LIST_HEAD(&insert_list); | |
2279 | INIT_LIST_HEAD(&update_list); | |
2280 | num_inserts = 0; | |
2281 | goto again; | |
2282 | } | |
2283 | ||
2284 | /* | |
2285 | * again, if we need to make absolutely sure there are no more pending | |
2286 | * extent operations left and we know that we skipped some, go back to | |
2287 | * the beginning and do it all again | |
2288 | */ | |
2289 | if (all && skipped) { | |
2290 | INIT_LIST_HEAD(&insert_list); | |
2291 | INIT_LIST_HEAD(&update_list); | |
2292 | search = 0; | |
2293 | skipped = 0; | |
2294 | num_inserts = 0; | |
2295 | goto again; | |
037e6390 | 2296 | } |
f3465ca4 | 2297 | out: |
7bb86316 | 2298 | btrfs_free_path(path); |
037e6390 CM |
2299 | return 0; |
2300 | } | |
2301 | ||
31840ae1 ZY |
2302 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
2303 | struct btrfs_root *root, | |
2304 | u64 bytenr, u64 num_bytes, int is_data) | |
e20d96d6 | 2305 | { |
1a5bc167 | 2306 | int err = 0; |
31840ae1 | 2307 | struct extent_buffer *buf; |
8ef97622 | 2308 | |
31840ae1 ZY |
2309 | if (is_data) |
2310 | goto pinit; | |
2311 | ||
2312 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); | |
2313 | if (!buf) | |
2314 | goto pinit; | |
2315 | ||
2316 | /* we can reuse a block if it hasn't been written | |
2317 | * and it is from this transaction. We can't | |
2318 | * reuse anything from the tree log root because | |
2319 | * it has tiny sub-transactions. | |
2320 | */ | |
2321 | if (btrfs_buffer_uptodate(buf, 0) && | |
2322 | btrfs_try_tree_lock(buf)) { | |
2323 | u64 header_owner = btrfs_header_owner(buf); | |
2324 | u64 header_transid = btrfs_header_generation(buf); | |
2325 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && | |
1a40e23b | 2326 | header_owner != BTRFS_TREE_RELOC_OBJECTID && |
31840ae1 ZY |
2327 | header_transid == trans->transid && |
2328 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
2329 | clean_tree_block(NULL, root, buf); | |
2330 | btrfs_tree_unlock(buf); | |
5f39d397 | 2331 | free_extent_buffer(buf); |
31840ae1 | 2332 | return 1; |
8ef97622 | 2333 | } |
31840ae1 | 2334 | btrfs_tree_unlock(buf); |
f4b9aa8d | 2335 | } |
31840ae1 ZY |
2336 | free_extent_buffer(buf); |
2337 | pinit: | |
2338 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); | |
2339 | ||
be744175 | 2340 | BUG_ON(err < 0); |
e20d96d6 CM |
2341 | return 0; |
2342 | } | |
2343 | ||
fec577fb | 2344 | /* |
a28ec197 | 2345 | * remove an extent from the root, returns 0 on success |
fec577fb | 2346 | */ |
31840ae1 ZY |
2347 | static int __free_extent(struct btrfs_trans_handle *trans, |
2348 | struct btrfs_root *root, | |
2349 | u64 bytenr, u64 num_bytes, u64 parent, | |
7bb86316 | 2350 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2351 | u64 owner_objectid, int pin, int mark_free) |
a28ec197 | 2352 | { |
5caf2a00 | 2353 | struct btrfs_path *path; |
e2fa7227 | 2354 | struct btrfs_key key; |
1261ec42 CM |
2355 | struct btrfs_fs_info *info = root->fs_info; |
2356 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 2357 | struct extent_buffer *leaf; |
a28ec197 | 2358 | int ret; |
952fccac CM |
2359 | int extent_slot = 0; |
2360 | int found_extent = 0; | |
2361 | int num_to_del = 1; | |
234b63a0 | 2362 | struct btrfs_extent_item *ei; |
cf27e1ee | 2363 | u32 refs; |
037e6390 | 2364 | |
db94535d | 2365 | key.objectid = bytenr; |
62e2749e | 2366 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 2367 | key.offset = num_bytes; |
5caf2a00 | 2368 | path = btrfs_alloc_path(); |
54aa1f4d CM |
2369 | if (!path) |
2370 | return -ENOMEM; | |
5f26f772 | 2371 | |
3c12ac72 | 2372 | path->reada = 1; |
3bb1a1bc YZ |
2373 | ret = lookup_extent_backref(trans, extent_root, path, |
2374 | bytenr, parent, root_objectid, | |
2375 | ref_generation, owner_objectid, 1); | |
7bb86316 | 2376 | if (ret == 0) { |
952fccac CM |
2377 | struct btrfs_key found_key; |
2378 | extent_slot = path->slots[0]; | |
2379 | while(extent_slot > 0) { | |
2380 | extent_slot--; | |
2381 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2382 | extent_slot); | |
2383 | if (found_key.objectid != bytenr) | |
2384 | break; | |
2385 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
2386 | found_key.offset == num_bytes) { | |
2387 | found_extent = 1; | |
2388 | break; | |
2389 | } | |
2390 | if (path->slots[0] - extent_slot > 5) | |
2391 | break; | |
2392 | } | |
31840ae1 ZY |
2393 | if (!found_extent) { |
2394 | ret = remove_extent_backref(trans, extent_root, path); | |
2395 | BUG_ON(ret); | |
2396 | btrfs_release_path(extent_root, path); | |
2397 | ret = btrfs_search_slot(trans, extent_root, | |
2398 | &key, path, -1, 1); | |
f3465ca4 JB |
2399 | if (ret) { |
2400 | printk(KERN_ERR "umm, got %d back from search" | |
2401 | ", was looking for %Lu\n", ret, | |
2402 | bytenr); | |
2403 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
2404 | } | |
31840ae1 ZY |
2405 | BUG_ON(ret); |
2406 | extent_slot = path->slots[0]; | |
2407 | } | |
7bb86316 CM |
2408 | } else { |
2409 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
2410 | WARN_ON(1); | |
2411 | printk("Unable to find ref byte nr %Lu root %Lu " | |
3bb1a1bc YZ |
2412 | "gen %Lu owner %Lu\n", bytenr, |
2413 | root_objectid, ref_generation, owner_objectid); | |
7bb86316 | 2414 | } |
5f39d397 CM |
2415 | |
2416 | leaf = path->nodes[0]; | |
952fccac | 2417 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 2418 | struct btrfs_extent_item); |
5f39d397 CM |
2419 | refs = btrfs_extent_refs(leaf, ei); |
2420 | BUG_ON(refs == 0); | |
2421 | refs -= 1; | |
2422 | btrfs_set_extent_refs(leaf, ei, refs); | |
952fccac | 2423 | |
5f39d397 CM |
2424 | btrfs_mark_buffer_dirty(leaf); |
2425 | ||
952fccac | 2426 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
31840ae1 ZY |
2427 | struct btrfs_extent_ref *ref; |
2428 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
2429 | struct btrfs_extent_ref); | |
2430 | BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1); | |
952fccac CM |
2431 | /* if the back ref and the extent are next to each other |
2432 | * they get deleted below in one shot | |
2433 | */ | |
2434 | path->slots[0] = extent_slot; | |
2435 | num_to_del = 2; | |
2436 | } else if (found_extent) { | |
2437 | /* otherwise delete the extent back ref */ | |
31840ae1 | 2438 | ret = remove_extent_backref(trans, extent_root, path); |
952fccac CM |
2439 | BUG_ON(ret); |
2440 | /* if refs are 0, we need to setup the path for deletion */ | |
2441 | if (refs == 0) { | |
2442 | btrfs_release_path(extent_root, path); | |
2443 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
2444 | -1, 1); | |
952fccac CM |
2445 | BUG_ON(ret); |
2446 | } | |
2447 | } | |
2448 | ||
cf27e1ee | 2449 | if (refs == 0) { |
db94535d CM |
2450 | u64 super_used; |
2451 | u64 root_used; | |
21af804c DW |
2452 | #ifdef BIO_RW_DISCARD |
2453 | u64 map_length = num_bytes; | |
2454 | struct btrfs_multi_bio *multi = NULL; | |
2455 | #endif | |
78fae27e CM |
2456 | |
2457 | if (pin) { | |
25179201 | 2458 | mutex_lock(&root->fs_info->pinned_mutex); |
31840ae1 ZY |
2459 | ret = pin_down_bytes(trans, root, bytenr, num_bytes, |
2460 | owner_objectid >= BTRFS_FIRST_FREE_OBJECTID); | |
25179201 | 2461 | mutex_unlock(&root->fs_info->pinned_mutex); |
c549228f Y |
2462 | if (ret > 0) |
2463 | mark_free = 1; | |
2464 | BUG_ON(ret < 0); | |
78fae27e CM |
2465 | } |
2466 | ||
58176a96 | 2467 | /* block accounting for super block */ |
a2135011 | 2468 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
2469 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2470 | btrfs_set_super_bytes_used(&info->super_copy, | |
2471 | super_used - num_bytes); | |
a2135011 | 2472 | spin_unlock_irq(&info->delalloc_lock); |
58176a96 JB |
2473 | |
2474 | /* block accounting for root item */ | |
db94535d | 2475 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 2476 | btrfs_set_root_used(&root->root_item, |
db94535d | 2477 | root_used - num_bytes); |
952fccac CM |
2478 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
2479 | num_to_del); | |
31840ae1 | 2480 | BUG_ON(ret); |
25179201 | 2481 | btrfs_release_path(extent_root, path); |
db94535d | 2482 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
0b86a832 | 2483 | mark_free); |
9078a3e1 | 2484 | BUG_ON(ret); |
21af804c DW |
2485 | |
2486 | #ifdef BIO_RW_DISCARD | |
2487 | /* Tell the block device(s) that the sectors can be discarded */ | |
2488 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2489 | bytenr, &map_length, &multi, 0); | |
2490 | if (!ret) { | |
2491 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
2492 | int i; | |
2493 | ||
2494 | if (map_length > num_bytes) | |
2495 | map_length = num_bytes; | |
2496 | ||
2497 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
2498 | blkdev_issue_discard(stripe->dev->bdev, | |
2499 | stripe->physical >> 9, | |
2500 | map_length >> 9); | |
2501 | } | |
2502 | kfree(multi); | |
2503 | } | |
2504 | #endif | |
a28ec197 | 2505 | } |
5caf2a00 | 2506 | btrfs_free_path(path); |
87ef2bb4 | 2507 | finish_current_insert(trans, extent_root, 0); |
a28ec197 CM |
2508 | return ret; |
2509 | } | |
2510 | ||
a28ec197 CM |
2511 | /* |
2512 | * find all the blocks marked as pending in the radix tree and remove | |
2513 | * them from the extent map | |
2514 | */ | |
e089f05c | 2515 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
87ef2bb4 | 2516 | btrfs_root *extent_root, int all) |
a28ec197 CM |
2517 | { |
2518 | int ret; | |
e20d96d6 | 2519 | int err = 0; |
1a5bc167 CM |
2520 | u64 start; |
2521 | u64 end; | |
31840ae1 | 2522 | u64 priv; |
25179201 | 2523 | u64 search = 0; |
f3465ca4 | 2524 | int nr = 0, skipped = 0; |
d1310b2e | 2525 | struct extent_io_tree *pending_del; |
31840ae1 ZY |
2526 | struct extent_io_tree *extent_ins; |
2527 | struct pending_extent_op *extent_op; | |
25179201 | 2528 | struct btrfs_fs_info *info = extent_root->fs_info; |
f3465ca4 | 2529 | struct list_head delete_list; |
8ef97622 | 2530 | |
f3465ca4 | 2531 | INIT_LIST_HEAD(&delete_list); |
31840ae1 | 2532 | extent_ins = &extent_root->fs_info->extent_ins; |
1a5bc167 | 2533 | pending_del = &extent_root->fs_info->pending_del; |
a28ec197 | 2534 | |
f3465ca4 JB |
2535 | again: |
2536 | mutex_lock(&info->extent_ins_mutex); | |
a28ec197 | 2537 | while(1) { |
25179201 JB |
2538 | ret = find_first_extent_bit(pending_del, search, &start, &end, |
2539 | EXTENT_WRITEBACK); | |
2540 | if (ret) { | |
f3465ca4 | 2541 | if (all && skipped && !nr) { |
25179201 JB |
2542 | search = 0; |
2543 | continue; | |
2544 | } | |
f3465ca4 | 2545 | mutex_unlock(&info->extent_ins_mutex); |
a28ec197 | 2546 | break; |
25179201 JB |
2547 | } |
2548 | ||
2549 | ret = try_lock_extent(extent_ins, start, end, GFP_NOFS); | |
2550 | if (!ret) { | |
2551 | search = end+1; | |
f3465ca4 JB |
2552 | skipped = 1; |
2553 | ||
2554 | if (need_resched()) { | |
2555 | mutex_unlock(&info->extent_ins_mutex); | |
2556 | cond_resched(); | |
2557 | mutex_lock(&info->extent_ins_mutex); | |
2558 | } | |
2559 | ||
25179201 JB |
2560 | continue; |
2561 | } | |
2562 | BUG_ON(ret < 0); | |
31840ae1 ZY |
2563 | |
2564 | ret = get_state_private(pending_del, start, &priv); | |
2565 | BUG_ON(ret); | |
2566 | extent_op = (struct pending_extent_op *)(unsigned long)priv; | |
2567 | ||
25179201 | 2568 | clear_extent_bits(pending_del, start, end, EXTENT_WRITEBACK, |
1a5bc167 | 2569 | GFP_NOFS); |
31840ae1 | 2570 | if (!test_range_bit(extent_ins, start, end, |
25179201 | 2571 | EXTENT_WRITEBACK, 0)) { |
f3465ca4 JB |
2572 | list_add_tail(&extent_op->list, &delete_list); |
2573 | nr++; | |
c286ac48 | 2574 | } else { |
31840ae1 | 2575 | kfree(extent_op); |
25179201 JB |
2576 | |
2577 | ret = get_state_private(&info->extent_ins, start, | |
2578 | &priv); | |
31840ae1 ZY |
2579 | BUG_ON(ret); |
2580 | extent_op = (struct pending_extent_op *) | |
25179201 JB |
2581 | (unsigned long)priv; |
2582 | ||
2583 | clear_extent_bits(&info->extent_ins, start, end, | |
2584 | EXTENT_WRITEBACK, GFP_NOFS); | |
31840ae1 | 2585 | |
f3465ca4 JB |
2586 | if (extent_op->type == PENDING_BACKREF_UPDATE) { |
2587 | list_add_tail(&extent_op->list, &delete_list); | |
2588 | search = end + 1; | |
2589 | nr++; | |
2590 | continue; | |
2591 | } | |
31840ae1 | 2592 | |
25179201 JB |
2593 | mutex_lock(&extent_root->fs_info->pinned_mutex); |
2594 | ret = pin_down_bytes(trans, extent_root, start, | |
2595 | end + 1 - start, 0); | |
2596 | mutex_unlock(&extent_root->fs_info->pinned_mutex); | |
2597 | ||
31840ae1 | 2598 | ret = update_block_group(trans, extent_root, start, |
25179201 JB |
2599 | end + 1 - start, 0, ret > 0); |
2600 | ||
f3465ca4 | 2601 | unlock_extent(extent_ins, start, end, GFP_NOFS); |
31840ae1 ZY |
2602 | BUG_ON(ret); |
2603 | kfree(extent_op); | |
c286ac48 | 2604 | } |
1a5bc167 CM |
2605 | if (ret) |
2606 | err = ret; | |
c286ac48 | 2607 | |
f3465ca4 JB |
2608 | search = end + 1; |
2609 | ||
2610 | if (need_resched()) { | |
2611 | mutex_unlock(&info->extent_ins_mutex); | |
2612 | cond_resched(); | |
2613 | mutex_lock(&info->extent_ins_mutex); | |
2614 | } | |
2615 | } | |
2616 | ||
2617 | if (nr) { | |
2618 | ret = free_extents(trans, extent_root, &delete_list); | |
2619 | BUG_ON(ret); | |
2620 | } | |
2621 | ||
2622 | if (all && skipped) { | |
2623 | INIT_LIST_HEAD(&delete_list); | |
2624 | search = 0; | |
2625 | nr = 0; | |
2626 | goto again; | |
fec577fb | 2627 | } |
f3465ca4 | 2628 | |
e20d96d6 | 2629 | return err; |
fec577fb CM |
2630 | } |
2631 | ||
2632 | /* | |
2633 | * remove an extent from the root, returns 0 on success | |
2634 | */ | |
925baedd | 2635 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2636 | struct btrfs_root *root, |
2637 | u64 bytenr, u64 num_bytes, u64 parent, | |
2638 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2639 | u64 owner_objectid, int pin) |
fec577fb | 2640 | { |
9f5fae2f | 2641 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
2642 | int pending_ret; |
2643 | int ret; | |
a28ec197 | 2644 | |
db94535d | 2645 | WARN_ON(num_bytes < root->sectorsize); |
fec577fb | 2646 | if (root == extent_root) { |
f3465ca4 JB |
2647 | struct pending_extent_op *extent_op = NULL; |
2648 | ||
2649 | mutex_lock(&root->fs_info->extent_ins_mutex); | |
2650 | if (test_range_bit(&root->fs_info->extent_ins, bytenr, | |
2651 | bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) { | |
2652 | u64 priv; | |
2653 | ret = get_state_private(&root->fs_info->extent_ins, | |
2654 | bytenr, &priv); | |
2655 | BUG_ON(ret); | |
2656 | extent_op = (struct pending_extent_op *) | |
2657 | (unsigned long)priv; | |
2658 | ||
2659 | extent_op->del = 1; | |
2660 | if (extent_op->type == PENDING_EXTENT_INSERT) { | |
2661 | mutex_unlock(&root->fs_info->extent_ins_mutex); | |
2662 | return 0; | |
2663 | } | |
2664 | } | |
2665 | ||
2666 | if (extent_op) { | |
2667 | ref_generation = extent_op->orig_generation; | |
2668 | parent = extent_op->orig_parent; | |
2669 | } | |
31840ae1 ZY |
2670 | |
2671 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2672 | BUG_ON(!extent_op); | |
2673 | ||
2674 | extent_op->type = PENDING_EXTENT_DELETE; | |
2675 | extent_op->bytenr = bytenr; | |
2676 | extent_op->num_bytes = num_bytes; | |
2677 | extent_op->parent = parent; | |
2678 | extent_op->orig_parent = parent; | |
2679 | extent_op->generation = ref_generation; | |
2680 | extent_op->orig_generation = ref_generation; | |
2681 | extent_op->level = (int)owner_objectid; | |
f3465ca4 JB |
2682 | INIT_LIST_HEAD(&extent_op->list); |
2683 | extent_op->del = 0; | |
31840ae1 ZY |
2684 | |
2685 | set_extent_bits(&root->fs_info->pending_del, | |
2686 | bytenr, bytenr + num_bytes - 1, | |
25179201 | 2687 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
2688 | set_state_private(&root->fs_info->pending_del, |
2689 | bytenr, (unsigned long)extent_op); | |
25179201 | 2690 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
fec577fb CM |
2691 | return 0; |
2692 | } | |
4bef0848 | 2693 | /* if metadata always pin */ |
d00aff00 CM |
2694 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
2695 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { | |
0f9dd46c JB |
2696 | struct btrfs_block_group_cache *cache; |
2697 | ||
d00aff00 | 2698 | /* btrfs_free_reserved_extent */ |
0f9dd46c JB |
2699 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
2700 | BUG_ON(!cache); | |
2701 | btrfs_add_free_space(cache, bytenr, num_bytes); | |
e8569813 | 2702 | update_reserved_extents(root, bytenr, num_bytes, 0); |
d00aff00 CM |
2703 | return 0; |
2704 | } | |
4bef0848 | 2705 | pin = 1; |
d00aff00 | 2706 | } |
4bef0848 CM |
2707 | |
2708 | /* if data pin when any transaction has committed this */ | |
2709 | if (ref_generation != trans->transid) | |
2710 | pin = 1; | |
2711 | ||
31840ae1 | 2712 | ret = __free_extent(trans, root, bytenr, num_bytes, parent, |
3bb1a1bc YZ |
2713 | root_objectid, ref_generation, |
2714 | owner_objectid, pin, pin == 0); | |
ee6e6504 | 2715 | |
87ef2bb4 CM |
2716 | finish_current_insert(trans, root->fs_info->extent_root, 0); |
2717 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root, 0); | |
fec577fb CM |
2718 | return ret ? ret : pending_ret; |
2719 | } | |
2720 | ||
925baedd | 2721 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2722 | struct btrfs_root *root, |
2723 | u64 bytenr, u64 num_bytes, u64 parent, | |
2724 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2725 | u64 owner_objectid, int pin) |
925baedd CM |
2726 | { |
2727 | int ret; | |
2728 | ||
31840ae1 | 2729 | ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent, |
925baedd | 2730 | root_objectid, ref_generation, |
3bb1a1bc | 2731 | owner_objectid, pin); |
925baedd CM |
2732 | return ret; |
2733 | } | |
2734 | ||
87ee04eb CM |
2735 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
2736 | { | |
2737 | u64 mask = ((u64)root->stripesize - 1); | |
2738 | u64 ret = (val + mask) & ~mask; | |
2739 | return ret; | |
2740 | } | |
2741 | ||
fec577fb CM |
2742 | /* |
2743 | * walks the btree of allocated extents and find a hole of a given size. | |
2744 | * The key ins is changed to record the hole: | |
2745 | * ins->objectid == block start | |
62e2749e | 2746 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
2747 | * ins->offset == number of blocks |
2748 | * Any available blocks before search_start are skipped. | |
2749 | */ | |
98ed5174 CM |
2750 | static int noinline find_free_extent(struct btrfs_trans_handle *trans, |
2751 | struct btrfs_root *orig_root, | |
2752 | u64 num_bytes, u64 empty_size, | |
2753 | u64 search_start, u64 search_end, | |
2754 | u64 hint_byte, struct btrfs_key *ins, | |
2755 | u64 exclude_start, u64 exclude_nr, | |
2756 | int data) | |
fec577fb | 2757 | { |
80eb234a | 2758 | int ret = 0; |
9f5fae2f | 2759 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
db94535d | 2760 | u64 total_needed = num_bytes; |
239b14b3 | 2761 | u64 *last_ptr = NULL; |
4366211c | 2762 | u64 last_wanted = 0; |
80eb234a | 2763 | struct btrfs_block_group_cache *block_group = NULL; |
0ef3e66b | 2764 | int chunk_alloc_done = 0; |
239b14b3 | 2765 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 2766 | int allowed_chunk_alloc = 0; |
80eb234a JB |
2767 | struct list_head *head = NULL, *cur = NULL; |
2768 | int loop = 0; | |
f5a31e16 | 2769 | int extra_loop = 0; |
80eb234a | 2770 | struct btrfs_space_info *space_info; |
fec577fb | 2771 | |
db94535d | 2772 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 2773 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
2774 | ins->objectid = 0; |
2775 | ins->offset = 0; | |
b1a4d965 | 2776 | |
0ef3e66b CM |
2777 | if (orig_root->ref_cows || empty_size) |
2778 | allowed_chunk_alloc = 1; | |
2779 | ||
239b14b3 CM |
2780 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
2781 | last_ptr = &root->fs_info->last_alloc; | |
4366211c | 2782 | empty_cluster = 64 * 1024; |
239b14b3 CM |
2783 | } |
2784 | ||
0f9dd46c | 2785 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) |
239b14b3 | 2786 | last_ptr = &root->fs_info->last_data_alloc; |
0f9dd46c | 2787 | |
239b14b3 | 2788 | if (last_ptr) { |
4366211c | 2789 | if (*last_ptr) { |
239b14b3 | 2790 | hint_byte = *last_ptr; |
4366211c CM |
2791 | last_wanted = *last_ptr; |
2792 | } else | |
239b14b3 | 2793 | empty_size += empty_cluster; |
4366211c CM |
2794 | } else { |
2795 | empty_cluster = 0; | |
239b14b3 | 2796 | } |
a061fc8d | 2797 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 2798 | search_start = max(search_start, hint_byte); |
0b86a832 | 2799 | |
42e70e7a | 2800 | if (last_wanted && search_start != last_wanted) { |
4366211c | 2801 | last_wanted = 0; |
42e70e7a CM |
2802 | empty_size += empty_cluster; |
2803 | } | |
4366211c | 2804 | |
42e70e7a | 2805 | total_needed += empty_size; |
80eb234a | 2806 | block_group = btrfs_lookup_block_group(root->fs_info, search_start); |
d899e052 YZ |
2807 | if (!block_group) |
2808 | block_group = btrfs_lookup_first_block_group(root->fs_info, | |
2809 | search_start); | |
80eb234a | 2810 | space_info = __find_space_info(root->fs_info, data); |
0f9dd46c | 2811 | |
80eb234a JB |
2812 | down_read(&space_info->groups_sem); |
2813 | while (1) { | |
2814 | struct btrfs_free_space *free_space; | |
0f9dd46c | 2815 | /* |
80eb234a JB |
2816 | * the only way this happens if our hint points to a block |
2817 | * group thats not of the proper type, while looping this | |
2818 | * should never happen | |
0f9dd46c | 2819 | */ |
8a1413a2 CM |
2820 | if (empty_size) |
2821 | extra_loop = 1; | |
2822 | ||
42e70e7a CM |
2823 | if (!block_group) |
2824 | goto new_group_no_lock; | |
2825 | ||
25179201 | 2826 | mutex_lock(&block_group->alloc_mutex); |
80eb234a | 2827 | if (unlikely(!block_group_bits(block_group, data))) |
0f9dd46c | 2828 | goto new_group; |
0f9dd46c | 2829 | |
80eb234a | 2830 | ret = cache_block_group(root, block_group); |
25179201 JB |
2831 | if (ret) { |
2832 | mutex_unlock(&block_group->alloc_mutex); | |
80eb234a | 2833 | break; |
25179201 | 2834 | } |
0f9dd46c | 2835 | |
80eb234a JB |
2836 | if (block_group->ro) |
2837 | goto new_group; | |
0f9dd46c | 2838 | |
80eb234a JB |
2839 | free_space = btrfs_find_free_space(block_group, search_start, |
2840 | total_needed); | |
2841 | if (free_space) { | |
2842 | u64 start = block_group->key.objectid; | |
2843 | u64 end = block_group->key.objectid + | |
0f9dd46c | 2844 | block_group->key.offset; |
239b14b3 | 2845 | |
80eb234a | 2846 | search_start = stripe_align(root, free_space->offset); |
0f9dd46c | 2847 | |
80eb234a JB |
2848 | /* move on to the next group */ |
2849 | if (search_start + num_bytes >= search_end) | |
2850 | goto new_group; | |
e37c9e69 | 2851 | |
80eb234a JB |
2852 | /* move on to the next group */ |
2853 | if (search_start + num_bytes > end) | |
2854 | goto new_group; | |
2855 | ||
4366211c | 2856 | if (last_wanted && search_start != last_wanted) { |
3b7885bf | 2857 | total_needed += empty_cluster; |
8a1413a2 | 2858 | empty_size += empty_cluster; |
4366211c | 2859 | last_wanted = 0; |
3b7885bf CM |
2860 | /* |
2861 | * if search_start is still in this block group | |
2862 | * then we just re-search this block group | |
2863 | */ | |
2864 | if (search_start >= start && | |
2865 | search_start < end) { | |
2866 | mutex_unlock(&block_group->alloc_mutex); | |
2867 | continue; | |
2868 | } | |
2869 | ||
2870 | /* else we go to the next block group */ | |
2871 | goto new_group; | |
2872 | } | |
2873 | ||
80eb234a JB |
2874 | if (exclude_nr > 0 && |
2875 | (search_start + num_bytes > exclude_start && | |
2876 | search_start < exclude_start + exclude_nr)) { | |
2877 | search_start = exclude_start + exclude_nr; | |
2878 | /* | |
2879 | * if search_start is still in this block group | |
2880 | * then we just re-search this block group | |
2881 | */ | |
2882 | if (search_start >= start && | |
25179201 JB |
2883 | search_start < end) { |
2884 | mutex_unlock(&block_group->alloc_mutex); | |
4366211c | 2885 | last_wanted = 0; |
80eb234a | 2886 | continue; |
25179201 | 2887 | } |
80eb234a JB |
2888 | |
2889 | /* else we go to the next block group */ | |
2890 | goto new_group; | |
2891 | } | |
2892 | ||
2893 | ins->objectid = search_start; | |
2894 | ins->offset = num_bytes; | |
25179201 JB |
2895 | |
2896 | btrfs_remove_free_space_lock(block_group, search_start, | |
2897 | num_bytes); | |
80eb234a | 2898 | /* we are all good, lets return */ |
25179201 | 2899 | mutex_unlock(&block_group->alloc_mutex); |
80eb234a | 2900 | break; |
0f9dd46c | 2901 | } |
80eb234a | 2902 | new_group: |
42e70e7a CM |
2903 | mutex_unlock(&block_group->alloc_mutex); |
2904 | new_group_no_lock: | |
f5a31e16 CM |
2905 | /* don't try to compare new allocations against the |
2906 | * last allocation any more | |
2907 | */ | |
4366211c | 2908 | last_wanted = 0; |
f5a31e16 | 2909 | |
80eb234a JB |
2910 | /* |
2911 | * Here's how this works. | |
2912 | * loop == 0: we were searching a block group via a hint | |
2913 | * and didn't find anything, so we start at | |
2914 | * the head of the block groups and keep searching | |
2915 | * loop == 1: we're searching through all of the block groups | |
2916 | * if we hit the head again we have searched | |
2917 | * all of the block groups for this space and we | |
2918 | * need to try and allocate, if we cant error out. | |
2919 | * loop == 2: we allocated more space and are looping through | |
2920 | * all of the block groups again. | |
2921 | */ | |
2922 | if (loop == 0) { | |
2923 | head = &space_info->block_groups; | |
2924 | cur = head->next; | |
80eb234a JB |
2925 | loop++; |
2926 | } else if (loop == 1 && cur == head) { | |
f5a31e16 CM |
2927 | int keep_going; |
2928 | ||
2929 | /* at this point we give up on the empty_size | |
2930 | * allocations and just try to allocate the min | |
2931 | * space. | |
2932 | * | |
2933 | * The extra_loop field was set if an empty_size | |
2934 | * allocation was attempted above, and if this | |
2935 | * is try we need to try the loop again without | |
2936 | * the additional empty_size. | |
2937 | */ | |
5b7c3fcc CM |
2938 | total_needed -= empty_size; |
2939 | empty_size = 0; | |
f5a31e16 CM |
2940 | keep_going = extra_loop; |
2941 | loop++; | |
42e70e7a | 2942 | |
80eb234a JB |
2943 | if (allowed_chunk_alloc && !chunk_alloc_done) { |
2944 | up_read(&space_info->groups_sem); | |
2945 | ret = do_chunk_alloc(trans, root, num_bytes + | |
2946 | 2 * 1024 * 1024, data, 1); | |
80eb234a | 2947 | down_read(&space_info->groups_sem); |
2ed6d664 CM |
2948 | if (ret < 0) |
2949 | goto loop_check; | |
80eb234a | 2950 | head = &space_info->block_groups; |
f5a31e16 CM |
2951 | /* |
2952 | * we've allocated a new chunk, keep | |
2953 | * trying | |
2954 | */ | |
2955 | keep_going = 1; | |
80eb234a JB |
2956 | chunk_alloc_done = 1; |
2957 | } else if (!allowed_chunk_alloc) { | |
2958 | space_info->force_alloc = 1; | |
f5a31e16 | 2959 | } |
2ed6d664 | 2960 | loop_check: |
f5a31e16 CM |
2961 | if (keep_going) { |
2962 | cur = head->next; | |
2963 | extra_loop = 0; | |
80eb234a JB |
2964 | } else { |
2965 | break; | |
2966 | } | |
2967 | } else if (cur == head) { | |
2968 | break; | |
0f9dd46c | 2969 | } |
0b86a832 | 2970 | |
80eb234a JB |
2971 | block_group = list_entry(cur, struct btrfs_block_group_cache, |
2972 | list); | |
2973 | search_start = block_group->key.objectid; | |
2974 | cur = cur->next; | |
f2654de4 | 2975 | } |
0b86a832 | 2976 | |
80eb234a JB |
2977 | /* we found what we needed */ |
2978 | if (ins->objectid) { | |
2979 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
2980 | trans->block_group = block_group; | |
0f9dd46c | 2981 | |
80eb234a JB |
2982 | if (last_ptr) |
2983 | *last_ptr = ins->objectid + ins->offset; | |
2984 | ret = 0; | |
2985 | } else if (!ret) { | |
2986 | ret = -ENOSPC; | |
be744175 | 2987 | } |
be744175 | 2988 | |
80eb234a | 2989 | up_read(&space_info->groups_sem); |
0f70abe2 | 2990 | return ret; |
fec577fb | 2991 | } |
ec44a35c | 2992 | |
0f9dd46c JB |
2993 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes) |
2994 | { | |
2995 | struct btrfs_block_group_cache *cache; | |
2996 | struct list_head *l; | |
2997 | ||
2998 | printk(KERN_INFO "space_info has %Lu free, is %sfull\n", | |
e8569813 ZY |
2999 | info->total_bytes - info->bytes_used - info->bytes_pinned - |
3000 | info->bytes_reserved, (info->full) ? "" : "not "); | |
0f9dd46c | 3001 | |
80eb234a | 3002 | down_read(&info->groups_sem); |
0f9dd46c JB |
3003 | list_for_each(l, &info->block_groups) { |
3004 | cache = list_entry(l, struct btrfs_block_group_cache, list); | |
3005 | spin_lock(&cache->lock); | |
3006 | printk(KERN_INFO "block group %Lu has %Lu bytes, %Lu used " | |
e8569813 | 3007 | "%Lu pinned %Lu reserved\n", |
0f9dd46c | 3008 | cache->key.objectid, cache->key.offset, |
e8569813 ZY |
3009 | btrfs_block_group_used(&cache->item), |
3010 | cache->pinned, cache->reserved); | |
0f9dd46c JB |
3011 | btrfs_dump_free_space(cache, bytes); |
3012 | spin_unlock(&cache->lock); | |
3013 | } | |
80eb234a | 3014 | up_read(&info->groups_sem); |
0f9dd46c | 3015 | } |
e8569813 | 3016 | |
e6dcd2dc CM |
3017 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
3018 | struct btrfs_root *root, | |
3019 | u64 num_bytes, u64 min_alloc_size, | |
3020 | u64 empty_size, u64 hint_byte, | |
3021 | u64 search_end, struct btrfs_key *ins, | |
3022 | u64 data) | |
fec577fb CM |
3023 | { |
3024 | int ret; | |
fbdc762b | 3025 | u64 search_start = 0; |
8790d502 | 3026 | u64 alloc_profile; |
1261ec42 | 3027 | struct btrfs_fs_info *info = root->fs_info; |
925baedd | 3028 | |
6324fbf3 | 3029 | if (data) { |
8790d502 CM |
3030 | alloc_profile = info->avail_data_alloc_bits & |
3031 | info->data_alloc_profile; | |
3032 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
6324fbf3 | 3033 | } else if (root == root->fs_info->chunk_root) { |
8790d502 CM |
3034 | alloc_profile = info->avail_system_alloc_bits & |
3035 | info->system_alloc_profile; | |
3036 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
6324fbf3 | 3037 | } else { |
8790d502 CM |
3038 | alloc_profile = info->avail_metadata_alloc_bits & |
3039 | info->metadata_alloc_profile; | |
3040 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
6324fbf3 | 3041 | } |
98d20f67 | 3042 | again: |
a061fc8d | 3043 | data = reduce_alloc_profile(root, data); |
0ef3e66b CM |
3044 | /* |
3045 | * the only place that sets empty_size is btrfs_realloc_node, which | |
3046 | * is not called recursively on allocations | |
3047 | */ | |
3048 | if (empty_size || root->ref_cows) { | |
593060d7 | 3049 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 3050 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
3051 | 2 * 1024 * 1024, |
3052 | BTRFS_BLOCK_GROUP_METADATA | | |
3053 | (info->metadata_alloc_profile & | |
3054 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
3055 | } |
3056 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 3057 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 | 3058 | } |
0b86a832 | 3059 | |
db94535d CM |
3060 | WARN_ON(num_bytes < root->sectorsize); |
3061 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
3062 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
3063 | trans->alloc_exclude_start, |
3064 | trans->alloc_exclude_nr, data); | |
3b951516 | 3065 | |
98d20f67 CM |
3066 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
3067 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 3068 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 3069 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
3070 | do_chunk_alloc(trans, root->fs_info->extent_root, |
3071 | num_bytes, data, 1); | |
98d20f67 CM |
3072 | goto again; |
3073 | } | |
ec44a35c | 3074 | if (ret) { |
0f9dd46c JB |
3075 | struct btrfs_space_info *sinfo; |
3076 | ||
3077 | sinfo = __find_space_info(root->fs_info, data); | |
3078 | printk("allocation failed flags %Lu, wanted %Lu\n", | |
3079 | data, num_bytes); | |
3080 | dump_space_info(sinfo, num_bytes); | |
925baedd | 3081 | BUG(); |
925baedd | 3082 | } |
0f9dd46c JB |
3083 | |
3084 | return ret; | |
e6dcd2dc CM |
3085 | } |
3086 | ||
65b51a00 CM |
3087 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
3088 | { | |
0f9dd46c JB |
3089 | struct btrfs_block_group_cache *cache; |
3090 | ||
0f9dd46c JB |
3091 | cache = btrfs_lookup_block_group(root->fs_info, start); |
3092 | if (!cache) { | |
3093 | printk(KERN_ERR "Unable to find block group for %Lu\n", start); | |
0f9dd46c JB |
3094 | return -ENOSPC; |
3095 | } | |
3096 | btrfs_add_free_space(cache, start, len); | |
1a40e23b | 3097 | update_reserved_extents(root, start, len, 0); |
65b51a00 CM |
3098 | return 0; |
3099 | } | |
3100 | ||
e6dcd2dc CM |
3101 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
3102 | struct btrfs_root *root, | |
3103 | u64 num_bytes, u64 min_alloc_size, | |
3104 | u64 empty_size, u64 hint_byte, | |
3105 | u64 search_end, struct btrfs_key *ins, | |
3106 | u64 data) | |
3107 | { | |
3108 | int ret; | |
e6dcd2dc CM |
3109 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, |
3110 | empty_size, hint_byte, search_end, ins, | |
3111 | data); | |
e8569813 | 3112 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
e6dcd2dc CM |
3113 | return ret; |
3114 | } | |
3115 | ||
3116 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3117 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 3118 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3119 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
3120 | { |
3121 | int ret; | |
3122 | int pending_ret; | |
3123 | u64 super_used; | |
3124 | u64 root_used; | |
3125 | u64 num_bytes = ins->offset; | |
3126 | u32 sizes[2]; | |
3127 | struct btrfs_fs_info *info = root->fs_info; | |
3128 | struct btrfs_root *extent_root = info->extent_root; | |
3129 | struct btrfs_extent_item *extent_item; | |
3130 | struct btrfs_extent_ref *ref; | |
3131 | struct btrfs_path *path; | |
3132 | struct btrfs_key keys[2]; | |
fec577fb | 3133 | |
31840ae1 ZY |
3134 | if (parent == 0) |
3135 | parent = ins->objectid; | |
3136 | ||
58176a96 | 3137 | /* block accounting for super block */ |
a2135011 | 3138 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
3139 | super_used = btrfs_super_bytes_used(&info->super_copy); |
3140 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
a2135011 | 3141 | spin_unlock_irq(&info->delalloc_lock); |
26b8003f | 3142 | |
58176a96 | 3143 | /* block accounting for root item */ |
db94535d CM |
3144 | root_used = btrfs_root_used(&root->root_item); |
3145 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
58176a96 | 3146 | |
26b8003f | 3147 | if (root == extent_root) { |
31840ae1 ZY |
3148 | struct pending_extent_op *extent_op; |
3149 | ||
3150 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
3151 | BUG_ON(!extent_op); | |
3152 | ||
3153 | extent_op->type = PENDING_EXTENT_INSERT; | |
3154 | extent_op->bytenr = ins->objectid; | |
3155 | extent_op->num_bytes = ins->offset; | |
3156 | extent_op->parent = parent; | |
3157 | extent_op->orig_parent = 0; | |
3158 | extent_op->generation = ref_generation; | |
3159 | extent_op->orig_generation = 0; | |
3160 | extent_op->level = (int)owner; | |
f3465ca4 JB |
3161 | INIT_LIST_HEAD(&extent_op->list); |
3162 | extent_op->del = 0; | |
31840ae1 | 3163 | |
25179201 | 3164 | mutex_lock(&root->fs_info->extent_ins_mutex); |
1a5bc167 CM |
3165 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
3166 | ins->objectid + ins->offset - 1, | |
25179201 | 3167 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
3168 | set_state_private(&root->fs_info->extent_ins, |
3169 | ins->objectid, (unsigned long)extent_op); | |
25179201 | 3170 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
26b8003f CM |
3171 | goto update_block; |
3172 | } | |
3173 | ||
47e4bb98 | 3174 | memcpy(&keys[0], ins, sizeof(*ins)); |
47e4bb98 CM |
3175 | keys[1].objectid = ins->objectid; |
3176 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 3177 | keys[1].offset = parent; |
47e4bb98 CM |
3178 | sizes[0] = sizeof(*extent_item); |
3179 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
3180 | |
3181 | path = btrfs_alloc_path(); | |
3182 | BUG_ON(!path); | |
47e4bb98 CM |
3183 | |
3184 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, | |
3185 | sizes, 2); | |
ccd467d6 | 3186 | BUG_ON(ret); |
0f9dd46c | 3187 | |
47e4bb98 CM |
3188 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
3189 | struct btrfs_extent_item); | |
3190 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); | |
3191 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
3192 | struct btrfs_extent_ref); | |
3193 | ||
3194 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
3195 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
3196 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
31840ae1 | 3197 | btrfs_set_ref_num_refs(path->nodes[0], ref, 1); |
47e4bb98 CM |
3198 | |
3199 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3200 | ||
3201 | trans->alloc_exclude_start = 0; | |
3202 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 3203 | btrfs_free_path(path); |
87ef2bb4 CM |
3204 | finish_current_insert(trans, extent_root, 0); |
3205 | pending_ret = del_pending_extents(trans, extent_root, 0); | |
f510cfec | 3206 | |
925baedd CM |
3207 | if (ret) |
3208 | goto out; | |
e37c9e69 | 3209 | if (pending_ret) { |
925baedd CM |
3210 | ret = pending_ret; |
3211 | goto out; | |
e37c9e69 | 3212 | } |
26b8003f CM |
3213 | |
3214 | update_block: | |
0b86a832 | 3215 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0); |
f5947066 CM |
3216 | if (ret) { |
3217 | printk("update block group failed for %Lu %Lu\n", | |
3218 | ins->objectid, ins->offset); | |
3219 | BUG(); | |
3220 | } | |
925baedd | 3221 | out: |
e6dcd2dc CM |
3222 | return ret; |
3223 | } | |
3224 | ||
3225 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3226 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 3227 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3228 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
3229 | { |
3230 | int ret; | |
1c2308f8 CM |
3231 | |
3232 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) | |
3233 | return 0; | |
3bb1a1bc YZ |
3234 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
3235 | ref_generation, owner, ins); | |
e8569813 | 3236 | update_reserved_extents(root, ins->objectid, ins->offset, 0); |
e6dcd2dc CM |
3237 | return ret; |
3238 | } | |
e02119d5 CM |
3239 | |
3240 | /* | |
3241 | * this is used by the tree logging recovery code. It records that | |
3242 | * an extent has been allocated and makes sure to clear the free | |
3243 | * space cache bits as well | |
3244 | */ | |
3245 | int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3246 | struct btrfs_root *root, u64 parent, |
e02119d5 | 3247 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3248 | u64 owner, struct btrfs_key *ins) |
e02119d5 CM |
3249 | { |
3250 | int ret; | |
3251 | struct btrfs_block_group_cache *block_group; | |
3252 | ||
e02119d5 | 3253 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
25179201 | 3254 | mutex_lock(&block_group->alloc_mutex); |
e02119d5 CM |
3255 | cache_block_group(root, block_group); |
3256 | ||
25179201 JB |
3257 | ret = btrfs_remove_free_space_lock(block_group, ins->objectid, |
3258 | ins->offset); | |
3259 | mutex_unlock(&block_group->alloc_mutex); | |
0f9dd46c | 3260 | BUG_ON(ret); |
3bb1a1bc YZ |
3261 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
3262 | ref_generation, owner, ins); | |
e02119d5 CM |
3263 | return ret; |
3264 | } | |
3265 | ||
e6dcd2dc CM |
3266 | /* |
3267 | * finds a free extent and does all the dirty work required for allocation | |
3268 | * returns the key for the extent through ins, and a tree buffer for | |
3269 | * the first block of the extent through buf. | |
3270 | * | |
3271 | * returns 0 if everything worked, non-zero otherwise. | |
3272 | */ | |
3273 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, | |
3274 | struct btrfs_root *root, | |
31840ae1 | 3275 | u64 num_bytes, u64 parent, u64 min_alloc_size, |
e6dcd2dc | 3276 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3277 | u64 owner_objectid, u64 empty_size, u64 hint_byte, |
e6dcd2dc CM |
3278 | u64 search_end, struct btrfs_key *ins, u64 data) |
3279 | { | |
3280 | int ret; | |
3281 | ||
e6dcd2dc CM |
3282 | ret = __btrfs_reserve_extent(trans, root, num_bytes, |
3283 | min_alloc_size, empty_size, hint_byte, | |
3284 | search_end, ins, data); | |
3285 | BUG_ON(ret); | |
d00aff00 | 3286 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
31840ae1 ZY |
3287 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, |
3288 | root_objectid, ref_generation, | |
3bb1a1bc | 3289 | owner_objectid, ins); |
d00aff00 | 3290 | BUG_ON(ret); |
e6dcd2dc | 3291 | |
e8569813 ZY |
3292 | } else { |
3293 | update_reserved_extents(root, ins->objectid, ins->offset, 1); | |
d00aff00 | 3294 | } |
925baedd | 3295 | return ret; |
fec577fb | 3296 | } |
65b51a00 CM |
3297 | |
3298 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, | |
3299 | struct btrfs_root *root, | |
3300 | u64 bytenr, u32 blocksize) | |
3301 | { | |
3302 | struct extent_buffer *buf; | |
3303 | ||
3304 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
3305 | if (!buf) | |
3306 | return ERR_PTR(-ENOMEM); | |
3307 | btrfs_set_header_generation(buf, trans->transid); | |
3308 | btrfs_tree_lock(buf); | |
3309 | clean_tree_block(trans, root, buf); | |
3310 | btrfs_set_buffer_uptodate(buf); | |
d0c803c4 CM |
3311 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
3312 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
3313 | buf->start + buf->len - 1, GFP_NOFS); | |
3314 | } else { | |
3315 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 3316 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 3317 | } |
65b51a00 CM |
3318 | trans->blocks_used++; |
3319 | return buf; | |
3320 | } | |
3321 | ||
fec577fb CM |
3322 | /* |
3323 | * helper function to allocate a block for a given tree | |
3324 | * returns the tree buffer or NULL. | |
3325 | */ | |
5f39d397 | 3326 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
7bb86316 | 3327 | struct btrfs_root *root, |
31840ae1 | 3328 | u32 blocksize, u64 parent, |
7bb86316 CM |
3329 | u64 root_objectid, |
3330 | u64 ref_generation, | |
7bb86316 CM |
3331 | int level, |
3332 | u64 hint, | |
5f39d397 | 3333 | u64 empty_size) |
fec577fb | 3334 | { |
e2fa7227 | 3335 | struct btrfs_key ins; |
fec577fb | 3336 | int ret; |
5f39d397 | 3337 | struct extent_buffer *buf; |
fec577fb | 3338 | |
31840ae1 | 3339 | ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, |
3bb1a1bc | 3340 | root_objectid, ref_generation, level, |
31840ae1 | 3341 | empty_size, hint, (u64)-1, &ins, 0); |
fec577fb | 3342 | if (ret) { |
54aa1f4d CM |
3343 | BUG_ON(ret > 0); |
3344 | return ERR_PTR(ret); | |
fec577fb | 3345 | } |
55c69072 | 3346 | |
65b51a00 | 3347 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize); |
fec577fb CM |
3348 | return buf; |
3349 | } | |
a28ec197 | 3350 | |
e02119d5 CM |
3351 | int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, |
3352 | struct btrfs_root *root, struct extent_buffer *leaf) | |
6407bf6d | 3353 | { |
7bb86316 CM |
3354 | u64 leaf_owner; |
3355 | u64 leaf_generation; | |
5f39d397 | 3356 | struct btrfs_key key; |
6407bf6d CM |
3357 | struct btrfs_file_extent_item *fi; |
3358 | int i; | |
3359 | int nritems; | |
3360 | int ret; | |
3361 | ||
5f39d397 CM |
3362 | BUG_ON(!btrfs_is_leaf(leaf)); |
3363 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
3364 | leaf_owner = btrfs_header_owner(leaf); |
3365 | leaf_generation = btrfs_header_generation(leaf); | |
3366 | ||
6407bf6d | 3367 | for (i = 0; i < nritems; i++) { |
db94535d | 3368 | u64 disk_bytenr; |
e34a5b4f | 3369 | cond_resched(); |
5f39d397 CM |
3370 | |
3371 | btrfs_item_key_to_cpu(leaf, &key, i); | |
3372 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d CM |
3373 | continue; |
3374 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
5f39d397 CM |
3375 | if (btrfs_file_extent_type(leaf, fi) == |
3376 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 3377 | continue; |
6407bf6d CM |
3378 | /* |
3379 | * FIXME make sure to insert a trans record that | |
3380 | * repeats the snapshot del on crash | |
3381 | */ | |
db94535d CM |
3382 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
3383 | if (disk_bytenr == 0) | |
3a686375 | 3384 | continue; |
4a096752 | 3385 | |
925baedd | 3386 | ret = __btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 | 3387 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
31840ae1 | 3388 | leaf->start, leaf_owner, leaf_generation, |
3bb1a1bc | 3389 | key.objectid, 0); |
31840ae1 | 3390 | BUG_ON(ret); |
2dd3e67b CM |
3391 | |
3392 | atomic_inc(&root->fs_info->throttle_gen); | |
3393 | wake_up(&root->fs_info->transaction_throttle); | |
3394 | cond_resched(); | |
6407bf6d CM |
3395 | } |
3396 | return 0; | |
3397 | } | |
3398 | ||
e02119d5 CM |
3399 | static int noinline cache_drop_leaf_ref(struct btrfs_trans_handle *trans, |
3400 | struct btrfs_root *root, | |
3401 | struct btrfs_leaf_ref *ref) | |
31153d81 YZ |
3402 | { |
3403 | int i; | |
3404 | int ret; | |
3405 | struct btrfs_extent_info *info = ref->extents; | |
3406 | ||
31153d81 | 3407 | for (i = 0; i < ref->nritems; i++) { |
31840ae1 ZY |
3408 | ret = __btrfs_free_extent(trans, root, info->bytenr, |
3409 | info->num_bytes, ref->bytenr, | |
3410 | ref->owner, ref->generation, | |
3bb1a1bc | 3411 | info->objectid, 0); |
2dd3e67b CM |
3412 | |
3413 | atomic_inc(&root->fs_info->throttle_gen); | |
3414 | wake_up(&root->fs_info->transaction_throttle); | |
3415 | cond_resched(); | |
3416 | ||
31153d81 YZ |
3417 | BUG_ON(ret); |
3418 | info++; | |
3419 | } | |
31153d81 YZ |
3420 | |
3421 | return 0; | |
3422 | } | |
3423 | ||
333db94c CM |
3424 | int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len, |
3425 | u32 *refs) | |
3426 | { | |
017e5369 | 3427 | int ret; |
f87f057b | 3428 | |
31840ae1 | 3429 | ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs); |
f87f057b CM |
3430 | BUG_ON(ret); |
3431 | ||
3432 | #if 0 // some debugging code in case we see problems here | |
3433 | /* if the refs count is one, it won't get increased again. But | |
3434 | * if the ref count is > 1, someone may be decreasing it at | |
3435 | * the same time we are. | |
3436 | */ | |
3437 | if (*refs != 1) { | |
3438 | struct extent_buffer *eb = NULL; | |
3439 | eb = btrfs_find_create_tree_block(root, start, len); | |
3440 | if (eb) | |
3441 | btrfs_tree_lock(eb); | |
3442 | ||
3443 | mutex_lock(&root->fs_info->alloc_mutex); | |
3444 | ret = lookup_extent_ref(NULL, root, start, len, refs); | |
3445 | BUG_ON(ret); | |
3446 | mutex_unlock(&root->fs_info->alloc_mutex); | |
3447 | ||
3448 | if (eb) { | |
3449 | btrfs_tree_unlock(eb); | |
3450 | free_extent_buffer(eb); | |
3451 | } | |
3452 | if (*refs == 1) { | |
3453 | printk("block %llu went down to one during drop_snap\n", | |
3454 | (unsigned long long)start); | |
3455 | } | |
3456 | ||
3457 | } | |
3458 | #endif | |
3459 | ||
e7a84565 | 3460 | cond_resched(); |
017e5369 | 3461 | return ret; |
333db94c CM |
3462 | } |
3463 | ||
9aca1d51 CM |
3464 | /* |
3465 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
3466 | * counts as it goes. | |
3467 | */ | |
98ed5174 CM |
3468 | static int noinline walk_down_tree(struct btrfs_trans_handle *trans, |
3469 | struct btrfs_root *root, | |
3470 | struct btrfs_path *path, int *level) | |
20524f02 | 3471 | { |
7bb86316 CM |
3472 | u64 root_owner; |
3473 | u64 root_gen; | |
3474 | u64 bytenr; | |
ca7a79ad | 3475 | u64 ptr_gen; |
5f39d397 CM |
3476 | struct extent_buffer *next; |
3477 | struct extent_buffer *cur; | |
7bb86316 | 3478 | struct extent_buffer *parent; |
31153d81 | 3479 | struct btrfs_leaf_ref *ref; |
db94535d | 3480 | u32 blocksize; |
20524f02 CM |
3481 | int ret; |
3482 | u32 refs; | |
3483 | ||
5caf2a00 CM |
3484 | WARN_ON(*level < 0); |
3485 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
333db94c | 3486 | ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start, |
db94535d | 3487 | path->nodes[*level]->len, &refs); |
20524f02 CM |
3488 | BUG_ON(ret); |
3489 | if (refs > 1) | |
3490 | goto out; | |
e011599b | 3491 | |
9aca1d51 CM |
3492 | /* |
3493 | * walk down to the last node level and free all the leaves | |
3494 | */ | |
6407bf6d | 3495 | while(*level >= 0) { |
5caf2a00 CM |
3496 | WARN_ON(*level < 0); |
3497 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 3498 | cur = path->nodes[*level]; |
e011599b | 3499 | |
5f39d397 | 3500 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 3501 | WARN_ON(1); |
e011599b | 3502 | |
7518a238 | 3503 | if (path->slots[*level] >= |
5f39d397 | 3504 | btrfs_header_nritems(cur)) |
20524f02 | 3505 | break; |
6407bf6d | 3506 | if (*level == 0) { |
e02119d5 | 3507 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
6407bf6d CM |
3508 | BUG_ON(ret); |
3509 | break; | |
3510 | } | |
db94535d | 3511 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
ca7a79ad | 3512 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
db94535d | 3513 | blocksize = btrfs_level_size(root, *level - 1); |
925baedd | 3514 | |
333db94c | 3515 | ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs); |
6407bf6d CM |
3516 | BUG_ON(ret); |
3517 | if (refs != 1) { | |
7bb86316 CM |
3518 | parent = path->nodes[*level]; |
3519 | root_owner = btrfs_header_owner(parent); | |
3520 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 3521 | path->slots[*level]++; |
f87f057b | 3522 | |
925baedd | 3523 | ret = __btrfs_free_extent(trans, root, bytenr, |
31840ae1 | 3524 | blocksize, parent->start, |
3bb1a1bc YZ |
3525 | root_owner, root_gen, |
3526 | *level - 1, 1); | |
20524f02 | 3527 | BUG_ON(ret); |
18e35e0a CM |
3528 | |
3529 | atomic_inc(&root->fs_info->throttle_gen); | |
3530 | wake_up(&root->fs_info->transaction_throttle); | |
2dd3e67b | 3531 | cond_resched(); |
18e35e0a | 3532 | |
20524f02 CM |
3533 | continue; |
3534 | } | |
f87f057b CM |
3535 | /* |
3536 | * at this point, we have a single ref, and since the | |
3537 | * only place referencing this extent is a dead root | |
3538 | * the reference count should never go higher. | |
3539 | * So, we don't need to check it again | |
3540 | */ | |
31153d81 | 3541 | if (*level == 1) { |
017e5369 | 3542 | ref = btrfs_lookup_leaf_ref(root, bytenr); |
1a40e23b ZY |
3543 | if (ref && ref->generation != ptr_gen) { |
3544 | btrfs_free_leaf_ref(root, ref); | |
3545 | ref = NULL; | |
3546 | } | |
31153d81 | 3547 | if (ref) { |
e02119d5 | 3548 | ret = cache_drop_leaf_ref(trans, root, ref); |
31153d81 YZ |
3549 | BUG_ON(ret); |
3550 | btrfs_remove_leaf_ref(root, ref); | |
bcc63abb | 3551 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
3552 | *level = 0; |
3553 | break; | |
3554 | } | |
3bb1a1bc | 3555 | if (printk_ratelimit()) { |
37d1aeee CM |
3556 | printk("leaf ref miss for bytenr %llu\n", |
3557 | (unsigned long long)bytenr); | |
3bb1a1bc | 3558 | } |
31153d81 | 3559 | } |
db94535d | 3560 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
1259ab75 | 3561 | if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
5f39d397 | 3562 | free_extent_buffer(next); |
333db94c | 3563 | |
ca7a79ad CM |
3564 | next = read_tree_block(root, bytenr, blocksize, |
3565 | ptr_gen); | |
e7a84565 | 3566 | cond_resched(); |
f87f057b CM |
3567 | #if 0 |
3568 | /* | |
3569 | * this is a debugging check and can go away | |
3570 | * the ref should never go all the way down to 1 | |
3571 | * at this point | |
3572 | */ | |
e6dcd2dc CM |
3573 | ret = lookup_extent_ref(NULL, root, bytenr, blocksize, |
3574 | &refs); | |
e9d0b13b | 3575 | BUG_ON(ret); |
f87f057b CM |
3576 | WARN_ON(refs != 1); |
3577 | #endif | |
e9d0b13b | 3578 | } |
5caf2a00 | 3579 | WARN_ON(*level <= 0); |
83e15a28 | 3580 | if (path->nodes[*level-1]) |
5f39d397 | 3581 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 3582 | path->nodes[*level-1] = next; |
5f39d397 | 3583 | *level = btrfs_header_level(next); |
20524f02 | 3584 | path->slots[*level] = 0; |
2dd3e67b | 3585 | cond_resched(); |
20524f02 CM |
3586 | } |
3587 | out: | |
5caf2a00 CM |
3588 | WARN_ON(*level < 0); |
3589 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
3590 | |
3591 | if (path->nodes[*level] == root->node) { | |
7bb86316 | 3592 | parent = path->nodes[*level]; |
31153d81 | 3593 | bytenr = path->nodes[*level]->start; |
7bb86316 CM |
3594 | } else { |
3595 | parent = path->nodes[*level + 1]; | |
31153d81 | 3596 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
7bb86316 CM |
3597 | } |
3598 | ||
31153d81 YZ |
3599 | blocksize = btrfs_level_size(root, *level); |
3600 | root_owner = btrfs_header_owner(parent); | |
7bb86316 | 3601 | root_gen = btrfs_header_generation(parent); |
31153d81 YZ |
3602 | |
3603 | ret = __btrfs_free_extent(trans, root, bytenr, blocksize, | |
31840ae1 | 3604 | parent->start, root_owner, root_gen, |
3bb1a1bc | 3605 | *level, 1); |
5f39d397 | 3606 | free_extent_buffer(path->nodes[*level]); |
20524f02 CM |
3607 | path->nodes[*level] = NULL; |
3608 | *level += 1; | |
3609 | BUG_ON(ret); | |
f87f057b | 3610 | |
e7a84565 | 3611 | cond_resched(); |
20524f02 CM |
3612 | return 0; |
3613 | } | |
3614 | ||
f82d02d9 YZ |
3615 | /* |
3616 | * helper function for drop_subtree, this function is similar to | |
3617 | * walk_down_tree. The main difference is that it checks reference | |
3618 | * counts while tree blocks are locked. | |
3619 | */ | |
3620 | static int noinline walk_down_subtree(struct btrfs_trans_handle *trans, | |
3621 | struct btrfs_root *root, | |
3622 | struct btrfs_path *path, int *level) | |
3623 | { | |
3624 | struct extent_buffer *next; | |
3625 | struct extent_buffer *cur; | |
3626 | struct extent_buffer *parent; | |
3627 | u64 bytenr; | |
3628 | u64 ptr_gen; | |
3629 | u32 blocksize; | |
3630 | u32 refs; | |
3631 | int ret; | |
3632 | ||
3633 | cur = path->nodes[*level]; | |
3634 | ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len, | |
3635 | &refs); | |
3636 | BUG_ON(ret); | |
3637 | if (refs > 1) | |
3638 | goto out; | |
3639 | ||
3640 | while (*level >= 0) { | |
3641 | cur = path->nodes[*level]; | |
3642 | if (*level == 0) { | |
3643 | ret = btrfs_drop_leaf_ref(trans, root, cur); | |
3644 | BUG_ON(ret); | |
3645 | clean_tree_block(trans, root, cur); | |
3646 | break; | |
3647 | } | |
3648 | if (path->slots[*level] >= btrfs_header_nritems(cur)) { | |
3649 | clean_tree_block(trans, root, cur); | |
3650 | break; | |
3651 | } | |
3652 | ||
3653 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
3654 | blocksize = btrfs_level_size(root, *level - 1); | |
3655 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
3656 | ||
3657 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); | |
3658 | btrfs_tree_lock(next); | |
3659 | ||
3660 | ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize, | |
3661 | &refs); | |
3662 | BUG_ON(ret); | |
3663 | if (refs > 1) { | |
3664 | parent = path->nodes[*level]; | |
3665 | ret = btrfs_free_extent(trans, root, bytenr, | |
3666 | blocksize, parent->start, | |
3667 | btrfs_header_owner(parent), | |
3668 | btrfs_header_generation(parent), | |
3669 | *level - 1, 1); | |
3670 | BUG_ON(ret); | |
3671 | path->slots[*level]++; | |
3672 | btrfs_tree_unlock(next); | |
3673 | free_extent_buffer(next); | |
3674 | continue; | |
3675 | } | |
3676 | ||
3677 | *level = btrfs_header_level(next); | |
3678 | path->nodes[*level] = next; | |
3679 | path->slots[*level] = 0; | |
3680 | path->locks[*level] = 1; | |
3681 | cond_resched(); | |
3682 | } | |
3683 | out: | |
3684 | parent = path->nodes[*level + 1]; | |
3685 | bytenr = path->nodes[*level]->start; | |
3686 | blocksize = path->nodes[*level]->len; | |
3687 | ||
3688 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, | |
3689 | parent->start, btrfs_header_owner(parent), | |
3690 | btrfs_header_generation(parent), *level, 1); | |
3691 | BUG_ON(ret); | |
3692 | ||
3693 | if (path->locks[*level]) { | |
3694 | btrfs_tree_unlock(path->nodes[*level]); | |
3695 | path->locks[*level] = 0; | |
3696 | } | |
3697 | free_extent_buffer(path->nodes[*level]); | |
3698 | path->nodes[*level] = NULL; | |
3699 | *level += 1; | |
3700 | cond_resched(); | |
3701 | return 0; | |
3702 | } | |
3703 | ||
9aca1d51 CM |
3704 | /* |
3705 | * helper for dropping snapshots. This walks back up the tree in the path | |
3706 | * to find the first node higher up where we haven't yet gone through | |
3707 | * all the slots | |
3708 | */ | |
98ed5174 CM |
3709 | static int noinline walk_up_tree(struct btrfs_trans_handle *trans, |
3710 | struct btrfs_root *root, | |
f82d02d9 YZ |
3711 | struct btrfs_path *path, |
3712 | int *level, int max_level) | |
20524f02 | 3713 | { |
7bb86316 CM |
3714 | u64 root_owner; |
3715 | u64 root_gen; | |
3716 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
3717 | int i; |
3718 | int slot; | |
3719 | int ret; | |
9f3a7427 | 3720 | |
f82d02d9 | 3721 | for (i = *level; i < max_level && path->nodes[i]; i++) { |
20524f02 | 3722 | slot = path->slots[i]; |
5f39d397 CM |
3723 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
3724 | struct extent_buffer *node; | |
3725 | struct btrfs_disk_key disk_key; | |
3726 | node = path->nodes[i]; | |
20524f02 CM |
3727 | path->slots[i]++; |
3728 | *level = i; | |
9f3a7427 | 3729 | WARN_ON(*level == 0); |
5f39d397 | 3730 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 3731 | memcpy(&root_item->drop_progress, |
5f39d397 | 3732 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 3733 | root_item->drop_level = i; |
20524f02 CM |
3734 | return 0; |
3735 | } else { | |
31840ae1 ZY |
3736 | struct extent_buffer *parent; |
3737 | if (path->nodes[*level] == root->node) | |
3738 | parent = path->nodes[*level]; | |
3739 | else | |
3740 | parent = path->nodes[*level + 1]; | |
3741 | ||
3742 | root_owner = btrfs_header_owner(parent); | |
3743 | root_gen = btrfs_header_generation(parent); | |
f82d02d9 YZ |
3744 | |
3745 | clean_tree_block(trans, root, path->nodes[*level]); | |
e089f05c | 3746 | ret = btrfs_free_extent(trans, root, |
db94535d | 3747 | path->nodes[*level]->start, |
7bb86316 | 3748 | path->nodes[*level]->len, |
3bb1a1bc YZ |
3749 | parent->start, root_owner, |
3750 | root_gen, *level, 1); | |
6407bf6d | 3751 | BUG_ON(ret); |
f82d02d9 YZ |
3752 | if (path->locks[*level]) { |
3753 | btrfs_tree_unlock(path->nodes[*level]); | |
3754 | path->locks[*level] = 0; | |
3755 | } | |
5f39d397 | 3756 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 3757 | path->nodes[*level] = NULL; |
20524f02 | 3758 | *level = i + 1; |
20524f02 CM |
3759 | } |
3760 | } | |
3761 | return 1; | |
3762 | } | |
3763 | ||
9aca1d51 CM |
3764 | /* |
3765 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
3766 | * the tree freeing any blocks that have a ref count of zero after being | |
3767 | * decremented. | |
3768 | */ | |
e089f05c | 3769 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 3770 | *root) |
20524f02 | 3771 | { |
3768f368 | 3772 | int ret = 0; |
9aca1d51 | 3773 | int wret; |
20524f02 | 3774 | int level; |
5caf2a00 | 3775 | struct btrfs_path *path; |
20524f02 CM |
3776 | int i; |
3777 | int orig_level; | |
9f3a7427 | 3778 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 3779 | |
a2135011 | 3780 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
5caf2a00 CM |
3781 | path = btrfs_alloc_path(); |
3782 | BUG_ON(!path); | |
20524f02 | 3783 | |
5f39d397 | 3784 | level = btrfs_header_level(root->node); |
20524f02 | 3785 | orig_level = level; |
9f3a7427 CM |
3786 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
3787 | path->nodes[level] = root->node; | |
f510cfec | 3788 | extent_buffer_get(root->node); |
9f3a7427 CM |
3789 | path->slots[level] = 0; |
3790 | } else { | |
3791 | struct btrfs_key key; | |
5f39d397 CM |
3792 | struct btrfs_disk_key found_key; |
3793 | struct extent_buffer *node; | |
6702ed49 | 3794 | |
9f3a7427 | 3795 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
3796 | level = root_item->drop_level; |
3797 | path->lowest_level = level; | |
9f3a7427 | 3798 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 3799 | if (wret < 0) { |
9f3a7427 CM |
3800 | ret = wret; |
3801 | goto out; | |
3802 | } | |
5f39d397 CM |
3803 | node = path->nodes[level]; |
3804 | btrfs_node_key(node, &found_key, path->slots[level]); | |
3805 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
3806 | sizeof(found_key))); | |
7d9eb12c CM |
3807 | /* |
3808 | * unlock our path, this is safe because only this | |
3809 | * function is allowed to delete this snapshot | |
3810 | */ | |
925baedd CM |
3811 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
3812 | if (path->nodes[i] && path->locks[i]) { | |
3813 | path->locks[i] = 0; | |
3814 | btrfs_tree_unlock(path->nodes[i]); | |
3815 | } | |
3816 | } | |
9f3a7427 | 3817 | } |
20524f02 | 3818 | while(1) { |
5caf2a00 | 3819 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 3820 | if (wret > 0) |
20524f02 | 3821 | break; |
9aca1d51 CM |
3822 | if (wret < 0) |
3823 | ret = wret; | |
3824 | ||
f82d02d9 YZ |
3825 | wret = walk_up_tree(trans, root, path, &level, |
3826 | BTRFS_MAX_LEVEL); | |
9aca1d51 | 3827 | if (wret > 0) |
20524f02 | 3828 | break; |
9aca1d51 CM |
3829 | if (wret < 0) |
3830 | ret = wret; | |
e7a84565 CM |
3831 | if (trans->transaction->in_commit) { |
3832 | ret = -EAGAIN; | |
3833 | break; | |
3834 | } | |
18e35e0a | 3835 | atomic_inc(&root->fs_info->throttle_gen); |
017e5369 | 3836 | wake_up(&root->fs_info->transaction_throttle); |
20524f02 | 3837 | } |
83e15a28 | 3838 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 3839 | if (path->nodes[i]) { |
5f39d397 | 3840 | free_extent_buffer(path->nodes[i]); |
0f82731f | 3841 | path->nodes[i] = NULL; |
83e15a28 | 3842 | } |
20524f02 | 3843 | } |
9f3a7427 | 3844 | out: |
5caf2a00 | 3845 | btrfs_free_path(path); |
9aca1d51 | 3846 | return ret; |
20524f02 | 3847 | } |
9078a3e1 | 3848 | |
f82d02d9 YZ |
3849 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
3850 | struct btrfs_root *root, | |
3851 | struct extent_buffer *node, | |
3852 | struct extent_buffer *parent) | |
3853 | { | |
3854 | struct btrfs_path *path; | |
3855 | int level; | |
3856 | int parent_level; | |
3857 | int ret = 0; | |
3858 | int wret; | |
3859 | ||
3860 | path = btrfs_alloc_path(); | |
3861 | BUG_ON(!path); | |
3862 | ||
3863 | BUG_ON(!btrfs_tree_locked(parent)); | |
3864 | parent_level = btrfs_header_level(parent); | |
3865 | extent_buffer_get(parent); | |
3866 | path->nodes[parent_level] = parent; | |
3867 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
3868 | ||
3869 | BUG_ON(!btrfs_tree_locked(node)); | |
3870 | level = btrfs_header_level(node); | |
3871 | extent_buffer_get(node); | |
3872 | path->nodes[level] = node; | |
3873 | path->slots[level] = 0; | |
3874 | ||
3875 | while (1) { | |
3876 | wret = walk_down_subtree(trans, root, path, &level); | |
3877 | if (wret < 0) | |
3878 | ret = wret; | |
3879 | if (wret != 0) | |
3880 | break; | |
3881 | ||
3882 | wret = walk_up_tree(trans, root, path, &level, parent_level); | |
3883 | if (wret < 0) | |
3884 | ret = wret; | |
3885 | if (wret != 0) | |
3886 | break; | |
3887 | } | |
3888 | ||
3889 | btrfs_free_path(path); | |
3890 | return ret; | |
3891 | } | |
3892 | ||
8e7bf94f CM |
3893 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
3894 | unsigned long nr) | |
3895 | { | |
3896 | return min(last, start + nr - 1); | |
3897 | } | |
3898 | ||
98ed5174 CM |
3899 | static int noinline relocate_inode_pages(struct inode *inode, u64 start, |
3900 | u64 len) | |
edbd8d4e CM |
3901 | { |
3902 | u64 page_start; | |
3903 | u64 page_end; | |
1a40e23b | 3904 | unsigned long first_index; |
edbd8d4e | 3905 | unsigned long last_index; |
edbd8d4e CM |
3906 | unsigned long i; |
3907 | struct page *page; | |
d1310b2e | 3908 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 3909 | struct file_ra_state *ra; |
3eaa2885 | 3910 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
3911 | unsigned int total_read = 0; |
3912 | unsigned int total_dirty = 0; | |
3913 | int ret = 0; | |
4313b399 CM |
3914 | |
3915 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
3916 | |
3917 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 3918 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
3919 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
3920 | ||
1a40e23b ZY |
3921 | /* make sure the dirty trick played by the caller work */ |
3922 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
3923 | first_index, last_index); | |
3924 | if (ret) | |
3925 | goto out_unlock; | |
8e7bf94f | 3926 | |
4313b399 | 3927 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 3928 | |
1a40e23b ZY |
3929 | for (i = first_index ; i <= last_index; i++) { |
3930 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 3931 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 3932 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
3933 | } |
3934 | total_read++; | |
3eaa2885 CM |
3935 | again: |
3936 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 3937 | BUG_ON(1); |
edbd8d4e | 3938 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 3939 | if (!page) { |
1a40e23b | 3940 | ret = -ENOMEM; |
edbd8d4e | 3941 | goto out_unlock; |
a061fc8d | 3942 | } |
edbd8d4e CM |
3943 | if (!PageUptodate(page)) { |
3944 | btrfs_readpage(NULL, page); | |
3945 | lock_page(page); | |
3946 | if (!PageUptodate(page)) { | |
3947 | unlock_page(page); | |
3948 | page_cache_release(page); | |
1a40e23b | 3949 | ret = -EIO; |
edbd8d4e CM |
3950 | goto out_unlock; |
3951 | } | |
3952 | } | |
ec44a35c | 3953 | wait_on_page_writeback(page); |
3eaa2885 | 3954 | |
edbd8d4e CM |
3955 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
3956 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 3957 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 3958 | |
3eaa2885 CM |
3959 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
3960 | if (ordered) { | |
3961 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3962 | unlock_page(page); | |
3963 | page_cache_release(page); | |
3964 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3965 | btrfs_put_ordered_extent(ordered); | |
3966 | goto again; | |
3967 | } | |
3968 | set_page_extent_mapped(page); | |
3969 | ||
ea8c2819 | 3970 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b ZY |
3971 | if (i == first_index) |
3972 | set_extent_bits(io_tree, page_start, page_end, | |
3973 | EXTENT_BOUNDARY, GFP_NOFS); | |
3974 | ||
a061fc8d | 3975 | set_page_dirty(page); |
1a40e23b | 3976 | total_dirty++; |
edbd8d4e | 3977 | |
d1310b2e | 3978 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
3979 | unlock_page(page); |
3980 | page_cache_release(page); | |
3981 | } | |
3982 | ||
3983 | out_unlock: | |
ec44a35c | 3984 | kfree(ra); |
edbd8d4e | 3985 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
3986 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
3987 | return ret; | |
edbd8d4e CM |
3988 | } |
3989 | ||
1a40e23b ZY |
3990 | static int noinline relocate_data_extent(struct inode *reloc_inode, |
3991 | struct btrfs_key *extent_key, | |
3992 | u64 offset) | |
3993 | { | |
3994 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
3995 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
3996 | struct extent_map *em; | |
6643558d YZ |
3997 | u64 start = extent_key->objectid - offset; |
3998 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 3999 | |
1a40e23b ZY |
4000 | em = alloc_extent_map(GFP_NOFS); |
4001 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 4002 | |
6643558d | 4003 | em->start = start; |
1a40e23b | 4004 | em->len = extent_key->offset; |
c8b97818 | 4005 | em->block_len = extent_key->offset; |
1a40e23b ZY |
4006 | em->block_start = extent_key->objectid; |
4007 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
4008 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
4009 | ||
4010 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 4011 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
4012 | while (1) { |
4013 | int ret; | |
4014 | spin_lock(&em_tree->lock); | |
4015 | ret = add_extent_mapping(em_tree, em); | |
4016 | spin_unlock(&em_tree->lock); | |
4017 | if (ret != -EEXIST) { | |
4018 | free_extent_map(em); | |
bf4ef679 CM |
4019 | break; |
4020 | } | |
6643558d | 4021 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 4022 | } |
6643558d | 4023 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 4024 | |
6643558d | 4025 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 4026 | } |
edbd8d4e | 4027 | |
1a40e23b ZY |
4028 | struct btrfs_ref_path { |
4029 | u64 extent_start; | |
4030 | u64 nodes[BTRFS_MAX_LEVEL]; | |
4031 | u64 root_objectid; | |
4032 | u64 root_generation; | |
4033 | u64 owner_objectid; | |
1a40e23b ZY |
4034 | u32 num_refs; |
4035 | int lowest_level; | |
4036 | int current_level; | |
f82d02d9 YZ |
4037 | int shared_level; |
4038 | ||
4039 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
4040 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 4041 | }; |
7d9eb12c | 4042 | |
1a40e23b | 4043 | struct disk_extent { |
c8b97818 | 4044 | u64 ram_bytes; |
1a40e23b ZY |
4045 | u64 disk_bytenr; |
4046 | u64 disk_num_bytes; | |
4047 | u64 offset; | |
4048 | u64 num_bytes; | |
c8b97818 CM |
4049 | u8 compression; |
4050 | u8 encryption; | |
4051 | u16 other_encoding; | |
1a40e23b | 4052 | }; |
4313b399 | 4053 | |
1a40e23b ZY |
4054 | static int is_cowonly_root(u64 root_objectid) |
4055 | { | |
4056 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
4057 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
4058 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
4059 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
4060 | root_objectid == BTRFS_TREE_LOG_OBJECTID) | |
4061 | return 1; | |
4062 | return 0; | |
4063 | } | |
edbd8d4e | 4064 | |
1a40e23b ZY |
4065 | static int noinline __next_ref_path(struct btrfs_trans_handle *trans, |
4066 | struct btrfs_root *extent_root, | |
4067 | struct btrfs_ref_path *ref_path, | |
4068 | int first_time) | |
4069 | { | |
4070 | struct extent_buffer *leaf; | |
4071 | struct btrfs_path *path; | |
4072 | struct btrfs_extent_ref *ref; | |
4073 | struct btrfs_key key; | |
4074 | struct btrfs_key found_key; | |
4075 | u64 bytenr; | |
4076 | u32 nritems; | |
4077 | int level; | |
4078 | int ret = 1; | |
edbd8d4e | 4079 | |
1a40e23b ZY |
4080 | path = btrfs_alloc_path(); |
4081 | if (!path) | |
4082 | return -ENOMEM; | |
bf4ef679 | 4083 | |
1a40e23b ZY |
4084 | if (first_time) { |
4085 | ref_path->lowest_level = -1; | |
4086 | ref_path->current_level = -1; | |
f82d02d9 | 4087 | ref_path->shared_level = -1; |
1a40e23b ZY |
4088 | goto walk_up; |
4089 | } | |
4090 | walk_down: | |
4091 | level = ref_path->current_level - 1; | |
4092 | while (level >= -1) { | |
4093 | u64 parent; | |
4094 | if (level < ref_path->lowest_level) | |
4095 | break; | |
bf4ef679 | 4096 | |
1a40e23b ZY |
4097 | if (level >= 0) { |
4098 | bytenr = ref_path->nodes[level]; | |
4099 | } else { | |
4100 | bytenr = ref_path->extent_start; | |
4101 | } | |
4102 | BUG_ON(bytenr == 0); | |
bf4ef679 | 4103 | |
1a40e23b ZY |
4104 | parent = ref_path->nodes[level + 1]; |
4105 | ref_path->nodes[level + 1] = 0; | |
4106 | ref_path->current_level = level; | |
4107 | BUG_ON(parent == 0); | |
0ef3e66b | 4108 | |
1a40e23b ZY |
4109 | key.objectid = bytenr; |
4110 | key.offset = parent + 1; | |
4111 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 4112 | |
1a40e23b ZY |
4113 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
4114 | if (ret < 0) | |
edbd8d4e | 4115 | goto out; |
1a40e23b | 4116 | BUG_ON(ret == 0); |
7d9eb12c | 4117 | |
1a40e23b ZY |
4118 | leaf = path->nodes[0]; |
4119 | nritems = btrfs_header_nritems(leaf); | |
4120 | if (path->slots[0] >= nritems) { | |
4121 | ret = btrfs_next_leaf(extent_root, path); | |
4122 | if (ret < 0) | |
4123 | goto out; | |
4124 | if (ret > 0) | |
4125 | goto next; | |
4126 | leaf = path->nodes[0]; | |
4127 | } | |
0ef3e66b | 4128 | |
1a40e23b ZY |
4129 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
4130 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
4131 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
4132 | if (level < ref_path->shared_level) | |
4133 | ref_path->shared_level = level; | |
1a40e23b | 4134 | goto found; |
f82d02d9 | 4135 | } |
1a40e23b ZY |
4136 | next: |
4137 | level--; | |
4138 | btrfs_release_path(extent_root, path); | |
d899e052 | 4139 | cond_resched(); |
1a40e23b ZY |
4140 | } |
4141 | /* reached lowest level */ | |
4142 | ret = 1; | |
4143 | goto out; | |
4144 | walk_up: | |
4145 | level = ref_path->current_level; | |
4146 | while (level < BTRFS_MAX_LEVEL - 1) { | |
4147 | u64 ref_objectid; | |
4148 | if (level >= 0) { | |
4149 | bytenr = ref_path->nodes[level]; | |
4150 | } else { | |
4151 | bytenr = ref_path->extent_start; | |
4152 | } | |
4153 | BUG_ON(bytenr == 0); | |
edbd8d4e | 4154 | |
1a40e23b ZY |
4155 | key.objectid = bytenr; |
4156 | key.offset = 0; | |
4157 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 4158 | |
1a40e23b ZY |
4159 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
4160 | if (ret < 0) | |
4161 | goto out; | |
edbd8d4e | 4162 | |
1a40e23b ZY |
4163 | leaf = path->nodes[0]; |
4164 | nritems = btrfs_header_nritems(leaf); | |
4165 | if (path->slots[0] >= nritems) { | |
4166 | ret = btrfs_next_leaf(extent_root, path); | |
4167 | if (ret < 0) | |
4168 | goto out; | |
4169 | if (ret > 0) { | |
4170 | /* the extent was freed by someone */ | |
4171 | if (ref_path->lowest_level == level) | |
4172 | goto out; | |
4173 | btrfs_release_path(extent_root, path); | |
4174 | goto walk_down; | |
4175 | } | |
4176 | leaf = path->nodes[0]; | |
4177 | } | |
edbd8d4e | 4178 | |
1a40e23b ZY |
4179 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
4180 | if (found_key.objectid != bytenr || | |
4181 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
4182 | /* the extent was freed by someone */ | |
4183 | if (ref_path->lowest_level == level) { | |
4184 | ret = 1; | |
4185 | goto out; | |
4186 | } | |
4187 | btrfs_release_path(extent_root, path); | |
4188 | goto walk_down; | |
4189 | } | |
4190 | found: | |
4191 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
4192 | struct btrfs_extent_ref); | |
4193 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
4194 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
4195 | if (first_time) { | |
4196 | level = (int)ref_objectid; | |
4197 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
4198 | ref_path->lowest_level = level; | |
4199 | ref_path->current_level = level; | |
4200 | ref_path->nodes[level] = bytenr; | |
4201 | } else { | |
4202 | WARN_ON(ref_objectid != level); | |
4203 | } | |
4204 | } else { | |
4205 | WARN_ON(level != -1); | |
4206 | } | |
4207 | first_time = 0; | |
bf4ef679 | 4208 | |
1a40e23b ZY |
4209 | if (ref_path->lowest_level == level) { |
4210 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
4211 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
4212 | } | |
bf4ef679 | 4213 | |
7d9eb12c | 4214 | /* |
1a40e23b ZY |
4215 | * the block is tree root or the block isn't in reference |
4216 | * counted tree. | |
7d9eb12c | 4217 | */ |
1a40e23b ZY |
4218 | if (found_key.objectid == found_key.offset || |
4219 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
4220 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4221 | ref_path->root_generation = | |
4222 | btrfs_ref_generation(leaf, ref); | |
4223 | if (level < 0) { | |
4224 | /* special reference from the tree log */ | |
4225 | ref_path->nodes[0] = found_key.offset; | |
4226 | ref_path->current_level = 0; | |
4227 | } | |
4228 | ret = 0; | |
4229 | goto out; | |
4230 | } | |
7d9eb12c | 4231 | |
1a40e23b ZY |
4232 | level++; |
4233 | BUG_ON(ref_path->nodes[level] != 0); | |
4234 | ref_path->nodes[level] = found_key.offset; | |
4235 | ref_path->current_level = level; | |
bf4ef679 | 4236 | |
1a40e23b ZY |
4237 | /* |
4238 | * the reference was created in the running transaction, | |
4239 | * no need to continue walking up. | |
4240 | */ | |
4241 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
4242 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4243 | ref_path->root_generation = | |
4244 | btrfs_ref_generation(leaf, ref); | |
4245 | ret = 0; | |
4246 | goto out; | |
7d9eb12c CM |
4247 | } |
4248 | ||
1a40e23b | 4249 | btrfs_release_path(extent_root, path); |
d899e052 | 4250 | cond_resched(); |
7d9eb12c | 4251 | } |
1a40e23b ZY |
4252 | /* reached max tree level, but no tree root found. */ |
4253 | BUG(); | |
edbd8d4e | 4254 | out: |
1a40e23b ZY |
4255 | btrfs_free_path(path); |
4256 | return ret; | |
edbd8d4e CM |
4257 | } |
4258 | ||
1a40e23b ZY |
4259 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
4260 | struct btrfs_root *extent_root, | |
4261 | struct btrfs_ref_path *ref_path, | |
4262 | u64 extent_start) | |
a061fc8d | 4263 | { |
1a40e23b ZY |
4264 | memset(ref_path, 0, sizeof(*ref_path)); |
4265 | ref_path->extent_start = extent_start; | |
a061fc8d | 4266 | |
1a40e23b | 4267 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
4268 | } |
4269 | ||
1a40e23b ZY |
4270 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
4271 | struct btrfs_root *extent_root, | |
4272 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 4273 | { |
1a40e23b ZY |
4274 | return __next_ref_path(trans, extent_root, ref_path, 0); |
4275 | } | |
4276 | ||
4277 | static int noinline get_new_locations(struct inode *reloc_inode, | |
4278 | struct btrfs_key *extent_key, | |
4279 | u64 offset, int no_fragment, | |
4280 | struct disk_extent **extents, | |
4281 | int *nr_extents) | |
4282 | { | |
4283 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
4284 | struct btrfs_path *path; | |
4285 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 4286 | struct extent_buffer *leaf; |
1a40e23b ZY |
4287 | struct disk_extent *exts = *extents; |
4288 | struct btrfs_key found_key; | |
4289 | u64 cur_pos; | |
4290 | u64 last_byte; | |
edbd8d4e | 4291 | u32 nritems; |
1a40e23b ZY |
4292 | int nr = 0; |
4293 | int max = *nr_extents; | |
4294 | int ret; | |
edbd8d4e | 4295 | |
1a40e23b ZY |
4296 | WARN_ON(!no_fragment && *extents); |
4297 | if (!exts) { | |
4298 | max = 1; | |
4299 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
4300 | if (!exts) | |
4301 | return -ENOMEM; | |
a061fc8d | 4302 | } |
edbd8d4e | 4303 | |
1a40e23b ZY |
4304 | path = btrfs_alloc_path(); |
4305 | BUG_ON(!path); | |
edbd8d4e | 4306 | |
1a40e23b ZY |
4307 | cur_pos = extent_key->objectid - offset; |
4308 | last_byte = extent_key->objectid + extent_key->offset; | |
4309 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
4310 | cur_pos, 0); | |
4311 | if (ret < 0) | |
4312 | goto out; | |
4313 | if (ret > 0) { | |
4314 | ret = -ENOENT; | |
4315 | goto out; | |
4316 | } | |
edbd8d4e | 4317 | |
1a40e23b | 4318 | while (1) { |
edbd8d4e CM |
4319 | leaf = path->nodes[0]; |
4320 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
4321 | if (path->slots[0] >= nritems) { |
4322 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
4323 | if (ret < 0) |
4324 | goto out; | |
1a40e23b ZY |
4325 | if (ret > 0) |
4326 | break; | |
bf4ef679 | 4327 | leaf = path->nodes[0]; |
a061fc8d | 4328 | } |
edbd8d4e CM |
4329 | |
4330 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
4331 | if (found_key.offset != cur_pos || |
4332 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
4333 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
4334 | break; |
4335 | ||
1a40e23b ZY |
4336 | fi = btrfs_item_ptr(leaf, path->slots[0], |
4337 | struct btrfs_file_extent_item); | |
4338 | if (btrfs_file_extent_type(leaf, fi) != | |
4339 | BTRFS_FILE_EXTENT_REG || | |
4340 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 4341 | break; |
1a40e23b ZY |
4342 | |
4343 | if (nr == max) { | |
4344 | struct disk_extent *old = exts; | |
4345 | max *= 2; | |
4346 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
4347 | memcpy(exts, old, sizeof(*exts) * nr); | |
4348 | if (old != *extents) | |
4349 | kfree(old); | |
a061fc8d | 4350 | } |
edbd8d4e | 4351 | |
1a40e23b ZY |
4352 | exts[nr].disk_bytenr = |
4353 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
4354 | exts[nr].disk_num_bytes = | |
4355 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4356 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
4357 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
4358 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
4359 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
4360 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
4361 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
4362 | fi); | |
d899e052 YZ |
4363 | BUG_ON(exts[nr].offset > 0); |
4364 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
4365 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 4366 | |
1a40e23b ZY |
4367 | cur_pos += exts[nr].num_bytes; |
4368 | nr++; | |
4369 | ||
4370 | if (cur_pos + offset >= last_byte) | |
4371 | break; | |
4372 | ||
4373 | if (no_fragment) { | |
4374 | ret = 1; | |
edbd8d4e | 4375 | goto out; |
1a40e23b ZY |
4376 | } |
4377 | path->slots[0]++; | |
4378 | } | |
4379 | ||
4380 | WARN_ON(cur_pos + offset > last_byte); | |
4381 | if (cur_pos + offset < last_byte) { | |
4382 | ret = -ENOENT; | |
4383 | goto out; | |
edbd8d4e CM |
4384 | } |
4385 | ret = 0; | |
4386 | out: | |
1a40e23b ZY |
4387 | btrfs_free_path(path); |
4388 | if (ret) { | |
4389 | if (exts != *extents) | |
4390 | kfree(exts); | |
4391 | } else { | |
4392 | *extents = exts; | |
4393 | *nr_extents = nr; | |
4394 | } | |
4395 | return ret; | |
4396 | } | |
4397 | ||
4398 | static int noinline replace_one_extent(struct btrfs_trans_handle *trans, | |
4399 | struct btrfs_root *root, | |
4400 | struct btrfs_path *path, | |
4401 | struct btrfs_key *extent_key, | |
4402 | struct btrfs_key *leaf_key, | |
4403 | struct btrfs_ref_path *ref_path, | |
4404 | struct disk_extent *new_extents, | |
4405 | int nr_extents) | |
4406 | { | |
4407 | struct extent_buffer *leaf; | |
4408 | struct btrfs_file_extent_item *fi; | |
4409 | struct inode *inode = NULL; | |
4410 | struct btrfs_key key; | |
4411 | u64 lock_start = 0; | |
4412 | u64 lock_end = 0; | |
4413 | u64 num_bytes; | |
4414 | u64 ext_offset; | |
4415 | u64 first_pos; | |
4416 | u32 nritems; | |
3bb1a1bc | 4417 | int nr_scaned = 0; |
1a40e23b | 4418 | int extent_locked = 0; |
d899e052 | 4419 | int extent_type; |
1a40e23b ZY |
4420 | int ret; |
4421 | ||
3bb1a1bc YZ |
4422 | memcpy(&key, leaf_key, sizeof(key)); |
4423 | first_pos = INT_LIMIT(loff_t) - extent_key->offset; | |
1a40e23b | 4424 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
4425 | if (key.objectid < ref_path->owner_objectid || |
4426 | (key.objectid == ref_path->owner_objectid && | |
4427 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
4428 | key.objectid = ref_path->owner_objectid; | |
4429 | key.type = BTRFS_EXTENT_DATA_KEY; | |
4430 | key.offset = 0; | |
4431 | } | |
1a40e23b ZY |
4432 | } |
4433 | ||
4434 | while (1) { | |
4435 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
4436 | if (ret < 0) | |
4437 | goto out; | |
4438 | ||
4439 | leaf = path->nodes[0]; | |
4440 | nritems = btrfs_header_nritems(leaf); | |
4441 | next: | |
4442 | if (extent_locked && ret > 0) { | |
4443 | /* | |
4444 | * the file extent item was modified by someone | |
4445 | * before the extent got locked. | |
4446 | */ | |
1a40e23b ZY |
4447 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4448 | lock_end, GFP_NOFS); | |
4449 | extent_locked = 0; | |
4450 | } | |
4451 | ||
4452 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 4453 | if (++nr_scaned > 2) |
1a40e23b ZY |
4454 | break; |
4455 | ||
4456 | BUG_ON(extent_locked); | |
4457 | ret = btrfs_next_leaf(root, path); | |
4458 | if (ret < 0) | |
4459 | goto out; | |
4460 | if (ret > 0) | |
4461 | break; | |
4462 | leaf = path->nodes[0]; | |
4463 | nritems = btrfs_header_nritems(leaf); | |
4464 | } | |
4465 | ||
4466 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
4467 | ||
4468 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
4469 | if ((key.objectid > ref_path->owner_objectid) || | |
4470 | (key.objectid == ref_path->owner_objectid && | |
4471 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
4472 | (key.offset >= first_pos + extent_key->offset)) | |
4473 | break; | |
4474 | } | |
4475 | ||
4476 | if (inode && key.objectid != inode->i_ino) { | |
4477 | BUG_ON(extent_locked); | |
4478 | btrfs_release_path(root, path); | |
4479 | mutex_unlock(&inode->i_mutex); | |
4480 | iput(inode); | |
4481 | inode = NULL; | |
4482 | continue; | |
4483 | } | |
4484 | ||
4485 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
4486 | path->slots[0]++; | |
4487 | ret = 1; | |
4488 | goto next; | |
4489 | } | |
4490 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4491 | struct btrfs_file_extent_item); | |
d899e052 YZ |
4492 | extent_type = btrfs_file_extent_type(leaf, fi); |
4493 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
4494 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
4495 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
4496 | extent_key->objectid)) { | |
4497 | path->slots[0]++; | |
4498 | ret = 1; | |
4499 | goto next; | |
4500 | } | |
4501 | ||
4502 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4503 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
4504 | ||
4505 | if (first_pos > key.offset - ext_offset) | |
4506 | first_pos = key.offset - ext_offset; | |
4507 | ||
4508 | if (!extent_locked) { | |
4509 | lock_start = key.offset; | |
4510 | lock_end = lock_start + num_bytes - 1; | |
4511 | } else { | |
6643558d YZ |
4512 | if (lock_start > key.offset || |
4513 | lock_end + 1 < key.offset + num_bytes) { | |
4514 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4515 | lock_start, lock_end, GFP_NOFS); | |
4516 | extent_locked = 0; | |
4517 | } | |
1a40e23b ZY |
4518 | } |
4519 | ||
4520 | if (!inode) { | |
4521 | btrfs_release_path(root, path); | |
4522 | ||
4523 | inode = btrfs_iget_locked(root->fs_info->sb, | |
4524 | key.objectid, root); | |
4525 | if (inode->i_state & I_NEW) { | |
4526 | BTRFS_I(inode)->root = root; | |
4527 | BTRFS_I(inode)->location.objectid = | |
4528 | key.objectid; | |
4529 | BTRFS_I(inode)->location.type = | |
4530 | BTRFS_INODE_ITEM_KEY; | |
4531 | BTRFS_I(inode)->location.offset = 0; | |
4532 | btrfs_read_locked_inode(inode); | |
4533 | unlock_new_inode(inode); | |
4534 | } | |
4535 | /* | |
4536 | * some code call btrfs_commit_transaction while | |
4537 | * holding the i_mutex, so we can't use mutex_lock | |
4538 | * here. | |
4539 | */ | |
4540 | if (is_bad_inode(inode) || | |
4541 | !mutex_trylock(&inode->i_mutex)) { | |
4542 | iput(inode); | |
4543 | inode = NULL; | |
4544 | key.offset = (u64)-1; | |
4545 | goto skip; | |
4546 | } | |
4547 | } | |
4548 | ||
4549 | if (!extent_locked) { | |
4550 | struct btrfs_ordered_extent *ordered; | |
4551 | ||
4552 | btrfs_release_path(root, path); | |
4553 | ||
4554 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
4555 | lock_end, GFP_NOFS); | |
4556 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
4557 | lock_end); | |
4558 | if (ordered && | |
4559 | ordered->file_offset <= lock_end && | |
4560 | ordered->file_offset + ordered->len > lock_start) { | |
4561 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4562 | lock_start, lock_end, GFP_NOFS); | |
4563 | btrfs_start_ordered_extent(inode, ordered, 1); | |
4564 | btrfs_put_ordered_extent(ordered); | |
4565 | key.offset += num_bytes; | |
4566 | goto skip; | |
4567 | } | |
4568 | if (ordered) | |
4569 | btrfs_put_ordered_extent(ordered); | |
4570 | ||
1a40e23b ZY |
4571 | extent_locked = 1; |
4572 | continue; | |
4573 | } | |
4574 | ||
4575 | if (nr_extents == 1) { | |
4576 | /* update extent pointer in place */ | |
1a40e23b ZY |
4577 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4578 | new_extents[0].disk_bytenr); | |
4579 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4580 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
4581 | btrfs_mark_buffer_dirty(leaf); |
4582 | ||
4583 | btrfs_drop_extent_cache(inode, key.offset, | |
4584 | key.offset + num_bytes - 1, 0); | |
4585 | ||
4586 | ret = btrfs_inc_extent_ref(trans, root, | |
4587 | new_extents[0].disk_bytenr, | |
4588 | new_extents[0].disk_num_bytes, | |
4589 | leaf->start, | |
4590 | root->root_key.objectid, | |
4591 | trans->transid, | |
3bb1a1bc | 4592 | key.objectid); |
1a40e23b ZY |
4593 | BUG_ON(ret); |
4594 | ||
4595 | ret = btrfs_free_extent(trans, root, | |
4596 | extent_key->objectid, | |
4597 | extent_key->offset, | |
4598 | leaf->start, | |
4599 | btrfs_header_owner(leaf), | |
4600 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4601 | key.objectid, 0); |
1a40e23b ZY |
4602 | BUG_ON(ret); |
4603 | ||
4604 | btrfs_release_path(root, path); | |
4605 | key.offset += num_bytes; | |
4606 | } else { | |
d899e052 YZ |
4607 | BUG_ON(1); |
4608 | #if 0 | |
1a40e23b ZY |
4609 | u64 alloc_hint; |
4610 | u64 extent_len; | |
4611 | int i; | |
4612 | /* | |
4613 | * drop old extent pointer at first, then insert the | |
4614 | * new pointers one bye one | |
4615 | */ | |
4616 | btrfs_release_path(root, path); | |
4617 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
4618 | key.offset + num_bytes, | |
4619 | key.offset, &alloc_hint); | |
4620 | BUG_ON(ret); | |
4621 | ||
4622 | for (i = 0; i < nr_extents; i++) { | |
4623 | if (ext_offset >= new_extents[i].num_bytes) { | |
4624 | ext_offset -= new_extents[i].num_bytes; | |
4625 | continue; | |
4626 | } | |
4627 | extent_len = min(new_extents[i].num_bytes - | |
4628 | ext_offset, num_bytes); | |
4629 | ||
4630 | ret = btrfs_insert_empty_item(trans, root, | |
4631 | path, &key, | |
4632 | sizeof(*fi)); | |
4633 | BUG_ON(ret); | |
4634 | ||
4635 | leaf = path->nodes[0]; | |
4636 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4637 | struct btrfs_file_extent_item); | |
4638 | btrfs_set_file_extent_generation(leaf, fi, | |
4639 | trans->transid); | |
4640 | btrfs_set_file_extent_type(leaf, fi, | |
4641 | BTRFS_FILE_EXTENT_REG); | |
4642 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
4643 | new_extents[i].disk_bytenr); | |
4644 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4645 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
4646 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
4647 | new_extents[i].ram_bytes); | |
4648 | ||
4649 | btrfs_set_file_extent_compression(leaf, fi, | |
4650 | new_extents[i].compression); | |
4651 | btrfs_set_file_extent_encryption(leaf, fi, | |
4652 | new_extents[i].encryption); | |
4653 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
4654 | new_extents[i].other_encoding); | |
4655 | ||
1a40e23b ZY |
4656 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4657 | extent_len); | |
4658 | ext_offset += new_extents[i].offset; | |
4659 | btrfs_set_file_extent_offset(leaf, fi, | |
4660 | ext_offset); | |
4661 | btrfs_mark_buffer_dirty(leaf); | |
4662 | ||
4663 | btrfs_drop_extent_cache(inode, key.offset, | |
4664 | key.offset + extent_len - 1, 0); | |
4665 | ||
4666 | ret = btrfs_inc_extent_ref(trans, root, | |
4667 | new_extents[i].disk_bytenr, | |
4668 | new_extents[i].disk_num_bytes, | |
4669 | leaf->start, | |
4670 | root->root_key.objectid, | |
3bb1a1bc | 4671 | trans->transid, key.objectid); |
1a40e23b ZY |
4672 | BUG_ON(ret); |
4673 | btrfs_release_path(root, path); | |
4674 | ||
a76a3cd4 | 4675 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
4676 | |
4677 | ext_offset = 0; | |
4678 | num_bytes -= extent_len; | |
4679 | key.offset += extent_len; | |
4680 | ||
4681 | if (num_bytes == 0) | |
4682 | break; | |
4683 | } | |
4684 | BUG_ON(i >= nr_extents); | |
d899e052 | 4685 | #endif |
1a40e23b ZY |
4686 | } |
4687 | ||
4688 | if (extent_locked) { | |
1a40e23b ZY |
4689 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4690 | lock_end, GFP_NOFS); | |
4691 | extent_locked = 0; | |
4692 | } | |
4693 | skip: | |
4694 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
4695 | key.offset >= first_pos + extent_key->offset) | |
4696 | break; | |
4697 | ||
4698 | cond_resched(); | |
4699 | } | |
4700 | ret = 0; | |
4701 | out: | |
4702 | btrfs_release_path(root, path); | |
4703 | if (inode) { | |
4704 | mutex_unlock(&inode->i_mutex); | |
4705 | if (extent_locked) { | |
1a40e23b ZY |
4706 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4707 | lock_end, GFP_NOFS); | |
4708 | } | |
4709 | iput(inode); | |
4710 | } | |
4711 | return ret; | |
4712 | } | |
4713 | ||
1a40e23b ZY |
4714 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
4715 | struct btrfs_root *root, | |
4716 | struct extent_buffer *buf, u64 orig_start) | |
4717 | { | |
4718 | int level; | |
4719 | int ret; | |
4720 | ||
4721 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
4722 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
4723 | ||
4724 | level = btrfs_header_level(buf); | |
4725 | if (level == 0) { | |
4726 | struct btrfs_leaf_ref *ref; | |
4727 | struct btrfs_leaf_ref *orig_ref; | |
4728 | ||
4729 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
4730 | if (!orig_ref) | |
4731 | return -ENOENT; | |
4732 | ||
4733 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
4734 | if (!ref) { | |
4735 | btrfs_free_leaf_ref(root, orig_ref); | |
4736 | return -ENOMEM; | |
4737 | } | |
4738 | ||
4739 | ref->nritems = orig_ref->nritems; | |
4740 | memcpy(ref->extents, orig_ref->extents, | |
4741 | sizeof(ref->extents[0]) * ref->nritems); | |
4742 | ||
4743 | btrfs_free_leaf_ref(root, orig_ref); | |
4744 | ||
4745 | ref->root_gen = trans->transid; | |
4746 | ref->bytenr = buf->start; | |
4747 | ref->owner = btrfs_header_owner(buf); | |
4748 | ref->generation = btrfs_header_generation(buf); | |
4749 | ret = btrfs_add_leaf_ref(root, ref, 0); | |
4750 | WARN_ON(ret); | |
4751 | btrfs_free_leaf_ref(root, ref); | |
4752 | } | |
4753 | return 0; | |
4754 | } | |
4755 | ||
4756 | static int noinline invalidate_extent_cache(struct btrfs_root *root, | |
4757 | struct extent_buffer *leaf, | |
4758 | struct btrfs_block_group_cache *group, | |
4759 | struct btrfs_root *target_root) | |
4760 | { | |
4761 | struct btrfs_key key; | |
4762 | struct inode *inode = NULL; | |
4763 | struct btrfs_file_extent_item *fi; | |
4764 | u64 num_bytes; | |
4765 | u64 skip_objectid = 0; | |
4766 | u32 nritems; | |
4767 | u32 i; | |
4768 | ||
4769 | nritems = btrfs_header_nritems(leaf); | |
4770 | for (i = 0; i < nritems; i++) { | |
4771 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4772 | if (key.objectid == skip_objectid || | |
4773 | key.type != BTRFS_EXTENT_DATA_KEY) | |
4774 | continue; | |
4775 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4776 | if (btrfs_file_extent_type(leaf, fi) == | |
4777 | BTRFS_FILE_EXTENT_INLINE) | |
4778 | continue; | |
4779 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
4780 | continue; | |
4781 | if (!inode || inode->i_ino != key.objectid) { | |
4782 | iput(inode); | |
4783 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
4784 | key.objectid, target_root, 1); | |
4785 | } | |
4786 | if (!inode) { | |
4787 | skip_objectid = key.objectid; | |
4788 | continue; | |
4789 | } | |
4790 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4791 | ||
4792 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, | |
4793 | key.offset + num_bytes - 1, GFP_NOFS); | |
1a40e23b ZY |
4794 | btrfs_drop_extent_cache(inode, key.offset, |
4795 | key.offset + num_bytes - 1, 1); | |
1a40e23b ZY |
4796 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
4797 | key.offset + num_bytes - 1, GFP_NOFS); | |
4798 | cond_resched(); | |
4799 | } | |
4800 | iput(inode); | |
4801 | return 0; | |
4802 | } | |
4803 | ||
4804 | static int noinline replace_extents_in_leaf(struct btrfs_trans_handle *trans, | |
4805 | struct btrfs_root *root, | |
4806 | struct extent_buffer *leaf, | |
4807 | struct btrfs_block_group_cache *group, | |
4808 | struct inode *reloc_inode) | |
4809 | { | |
4810 | struct btrfs_key key; | |
4811 | struct btrfs_key extent_key; | |
4812 | struct btrfs_file_extent_item *fi; | |
4813 | struct btrfs_leaf_ref *ref; | |
4814 | struct disk_extent *new_extent; | |
4815 | u64 bytenr; | |
4816 | u64 num_bytes; | |
4817 | u32 nritems; | |
4818 | u32 i; | |
4819 | int ext_index; | |
4820 | int nr_extent; | |
4821 | int ret; | |
4822 | ||
4823 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
4824 | BUG_ON(!new_extent); | |
4825 | ||
4826 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
4827 | BUG_ON(!ref); | |
4828 | ||
4829 | ext_index = -1; | |
4830 | nritems = btrfs_header_nritems(leaf); | |
4831 | for (i = 0; i < nritems; i++) { | |
4832 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4833 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
4834 | continue; | |
4835 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4836 | if (btrfs_file_extent_type(leaf, fi) == | |
4837 | BTRFS_FILE_EXTENT_INLINE) | |
4838 | continue; | |
4839 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
4840 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4841 | if (bytenr == 0) | |
4842 | continue; | |
4843 | ||
4844 | ext_index++; | |
4845 | if (bytenr >= group->key.objectid + group->key.offset || | |
4846 | bytenr + num_bytes <= group->key.objectid) | |
4847 | continue; | |
4848 | ||
4849 | extent_key.objectid = bytenr; | |
4850 | extent_key.offset = num_bytes; | |
4851 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
4852 | nr_extent = 1; | |
4853 | ret = get_new_locations(reloc_inode, &extent_key, | |
4854 | group->key.objectid, 1, | |
4855 | &new_extent, &nr_extent); | |
4856 | if (ret > 0) | |
4857 | continue; | |
4858 | BUG_ON(ret < 0); | |
4859 | ||
4860 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
4861 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
4862 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
4863 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
4864 | ||
1a40e23b ZY |
4865 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4866 | new_extent->disk_bytenr); | |
4867 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4868 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
4869 | btrfs_mark_buffer_dirty(leaf); |
4870 | ||
4871 | ret = btrfs_inc_extent_ref(trans, root, | |
4872 | new_extent->disk_bytenr, | |
4873 | new_extent->disk_num_bytes, | |
4874 | leaf->start, | |
4875 | root->root_key.objectid, | |
3bb1a1bc | 4876 | trans->transid, key.objectid); |
1a40e23b ZY |
4877 | BUG_ON(ret); |
4878 | ret = btrfs_free_extent(trans, root, | |
4879 | bytenr, num_bytes, leaf->start, | |
4880 | btrfs_header_owner(leaf), | |
4881 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4882 | key.objectid, 0); |
1a40e23b ZY |
4883 | BUG_ON(ret); |
4884 | cond_resched(); | |
4885 | } | |
4886 | kfree(new_extent); | |
4887 | BUG_ON(ext_index + 1 != ref->nritems); | |
4888 | btrfs_free_leaf_ref(root, ref); | |
4889 | return 0; | |
4890 | } | |
4891 | ||
f82d02d9 YZ |
4892 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
4893 | struct btrfs_root *root) | |
1a40e23b ZY |
4894 | { |
4895 | struct btrfs_root *reloc_root; | |
f82d02d9 | 4896 | int ret; |
1a40e23b ZY |
4897 | |
4898 | if (root->reloc_root) { | |
4899 | reloc_root = root->reloc_root; | |
4900 | root->reloc_root = NULL; | |
4901 | list_add(&reloc_root->dead_list, | |
4902 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
4903 | |
4904 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
4905 | reloc_root->node->start); | |
4906 | btrfs_set_root_level(&root->root_item, | |
4907 | btrfs_header_level(reloc_root->node)); | |
4908 | memset(&reloc_root->root_item.drop_progress, 0, | |
4909 | sizeof(struct btrfs_disk_key)); | |
4910 | reloc_root->root_item.drop_level = 0; | |
4911 | ||
4912 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4913 | &reloc_root->root_key, | |
4914 | &reloc_root->root_item); | |
4915 | BUG_ON(ret); | |
1a40e23b ZY |
4916 | } |
4917 | return 0; | |
4918 | } | |
4919 | ||
4920 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
4921 | { | |
4922 | struct btrfs_trans_handle *trans; | |
4923 | struct btrfs_root *reloc_root; | |
4924 | struct btrfs_root *prev_root = NULL; | |
4925 | struct list_head dead_roots; | |
4926 | int ret; | |
4927 | unsigned long nr; | |
4928 | ||
4929 | INIT_LIST_HEAD(&dead_roots); | |
4930 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
4931 | ||
4932 | while (!list_empty(&dead_roots)) { | |
4933 | reloc_root = list_entry(dead_roots.prev, | |
4934 | struct btrfs_root, dead_list); | |
4935 | list_del_init(&reloc_root->dead_list); | |
4936 | ||
4937 | BUG_ON(reloc_root->commit_root != NULL); | |
4938 | while (1) { | |
4939 | trans = btrfs_join_transaction(root, 1); | |
4940 | BUG_ON(!trans); | |
4941 | ||
4942 | mutex_lock(&root->fs_info->drop_mutex); | |
4943 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
4944 | if (ret != -EAGAIN) | |
4945 | break; | |
4946 | mutex_unlock(&root->fs_info->drop_mutex); | |
4947 | ||
4948 | nr = trans->blocks_used; | |
4949 | ret = btrfs_end_transaction(trans, root); | |
4950 | BUG_ON(ret); | |
4951 | btrfs_btree_balance_dirty(root, nr); | |
4952 | } | |
4953 | ||
4954 | free_extent_buffer(reloc_root->node); | |
4955 | ||
4956 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
4957 | &reloc_root->root_key); | |
4958 | BUG_ON(ret); | |
4959 | mutex_unlock(&root->fs_info->drop_mutex); | |
4960 | ||
4961 | nr = trans->blocks_used; | |
4962 | ret = btrfs_end_transaction(trans, root); | |
4963 | BUG_ON(ret); | |
4964 | btrfs_btree_balance_dirty(root, nr); | |
4965 | ||
4966 | kfree(prev_root); | |
4967 | prev_root = reloc_root; | |
4968 | } | |
4969 | if (prev_root) { | |
4970 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
4971 | kfree(prev_root); | |
4972 | } | |
4973 | return 0; | |
4974 | } | |
4975 | ||
4976 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
4977 | { | |
4978 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
4979 | return 0; | |
4980 | } | |
4981 | ||
4982 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
4983 | { | |
4984 | struct btrfs_root *reloc_root; | |
4985 | struct btrfs_trans_handle *trans; | |
4986 | struct btrfs_key location; | |
4987 | int found; | |
4988 | int ret; | |
4989 | ||
4990 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
4991 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
4992 | BUG_ON(ret); | |
4993 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
4994 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
4995 | ||
4996 | if (found) { | |
4997 | trans = btrfs_start_transaction(root, 1); | |
4998 | BUG_ON(!trans); | |
4999 | ret = btrfs_commit_transaction(trans, root); | |
5000 | BUG_ON(ret); | |
5001 | } | |
5002 | ||
5003 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
5004 | location.offset = (u64)-1; | |
5005 | location.type = BTRFS_ROOT_ITEM_KEY; | |
5006 | ||
5007 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
5008 | BUG_ON(!reloc_root); | |
5009 | btrfs_orphan_cleanup(reloc_root); | |
5010 | return 0; | |
5011 | } | |
5012 | ||
5013 | static int noinline init_reloc_tree(struct btrfs_trans_handle *trans, | |
5014 | struct btrfs_root *root) | |
5015 | { | |
5016 | struct btrfs_root *reloc_root; | |
5017 | struct extent_buffer *eb; | |
5018 | struct btrfs_root_item *root_item; | |
5019 | struct btrfs_key root_key; | |
5020 | int ret; | |
5021 | ||
5022 | BUG_ON(!root->ref_cows); | |
5023 | if (root->reloc_root) | |
5024 | return 0; | |
5025 | ||
5026 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
5027 | BUG_ON(!root_item); | |
5028 | ||
5029 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
5030 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
5031 | BUG_ON(ret); | |
5032 | ||
5033 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
5034 | root_key.offset = root->root_key.objectid; | |
5035 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5036 | ||
5037 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
5038 | btrfs_set_root_refs(root_item, 0); | |
5039 | btrfs_set_root_bytenr(root_item, eb->start); | |
5040 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 5041 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
5042 | |
5043 | btrfs_tree_unlock(eb); | |
5044 | free_extent_buffer(eb); | |
5045 | ||
5046 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
5047 | &root_key, root_item); | |
5048 | BUG_ON(ret); | |
5049 | kfree(root_item); | |
5050 | ||
5051 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
5052 | &root_key); | |
5053 | BUG_ON(!reloc_root); | |
5054 | reloc_root->last_trans = trans->transid; | |
5055 | reloc_root->commit_root = NULL; | |
5056 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
5057 | ||
5058 | root->reloc_root = reloc_root; | |
5059 | return 0; | |
5060 | } | |
5061 | ||
5062 | /* | |
5063 | * Core function of space balance. | |
5064 | * | |
5065 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
5066 | * counted roots. There is one reloc tree for each subvol, and all |
5067 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
5068 | * of the latest committed roots of subvols (root->commit_root). | |
5069 | * | |
5070 | * To relocate a tree block referenced by a subvol, there are two steps. | |
5071 | * COW the block through subvol's reloc tree, then update block pointer | |
5072 | * in the subvol to point to the new block. Since all reloc trees share | |
5073 | * same root key objectid, doing special handing for tree blocks owned | |
5074 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
5075 | * we can use the resulting new block directly when the same block is | |
5076 | * required to COW again through other reloc trees. By this way, relocated | |
5077 | * tree blocks are shared between reloc trees, so they are also shared | |
5078 | * between subvols. | |
1a40e23b ZY |
5079 | */ |
5080 | static int noinline relocate_one_path(struct btrfs_trans_handle *trans, | |
5081 | struct btrfs_root *root, | |
5082 | struct btrfs_path *path, | |
5083 | struct btrfs_key *first_key, | |
5084 | struct btrfs_ref_path *ref_path, | |
5085 | struct btrfs_block_group_cache *group, | |
5086 | struct inode *reloc_inode) | |
5087 | { | |
5088 | struct btrfs_root *reloc_root; | |
5089 | struct extent_buffer *eb = NULL; | |
5090 | struct btrfs_key *keys; | |
5091 | u64 *nodes; | |
5092 | int level; | |
f82d02d9 | 5093 | int shared_level; |
1a40e23b | 5094 | int lowest_level = 0; |
1a40e23b ZY |
5095 | int ret; |
5096 | ||
5097 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
5098 | lowest_level = ref_path->owner_objectid; | |
5099 | ||
f82d02d9 | 5100 | if (!root->ref_cows) { |
1a40e23b ZY |
5101 | path->lowest_level = lowest_level; |
5102 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
5103 | BUG_ON(ret < 0); | |
5104 | path->lowest_level = 0; | |
5105 | btrfs_release_path(root, path); | |
5106 | return 0; | |
5107 | } | |
5108 | ||
1a40e23b ZY |
5109 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
5110 | ret = init_reloc_tree(trans, root); | |
5111 | BUG_ON(ret); | |
5112 | reloc_root = root->reloc_root; | |
5113 | ||
f82d02d9 YZ |
5114 | shared_level = ref_path->shared_level; |
5115 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 5116 | |
f82d02d9 YZ |
5117 | keys = ref_path->node_keys; |
5118 | nodes = ref_path->new_nodes; | |
5119 | memset(&keys[shared_level + 1], 0, | |
5120 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
5121 | memset(&nodes[shared_level + 1], 0, | |
5122 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 5123 | |
f82d02d9 YZ |
5124 | if (nodes[lowest_level] == 0) { |
5125 | path->lowest_level = lowest_level; | |
5126 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
5127 | 0, 1); | |
5128 | BUG_ON(ret); | |
5129 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
5130 | eb = path->nodes[level]; | |
5131 | if (!eb || eb == reloc_root->node) | |
5132 | break; | |
5133 | nodes[level] = eb->start; | |
5134 | if (level == 0) | |
5135 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
5136 | else | |
5137 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
5138 | } | |
5139 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
5140 | eb = path->nodes[0]; | |
5141 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
5142 | group, reloc_inode); | |
5143 | BUG_ON(ret); | |
5144 | } | |
5145 | btrfs_release_path(reloc_root, path); | |
5146 | } else { | |
1a40e23b | 5147 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 5148 | lowest_level); |
1a40e23b ZY |
5149 | BUG_ON(ret); |
5150 | } | |
5151 | ||
1a40e23b ZY |
5152 | /* |
5153 | * replace tree blocks in the fs tree with tree blocks in | |
5154 | * the reloc tree. | |
5155 | */ | |
5156 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
5157 | BUG_ON(ret < 0); | |
5158 | ||
5159 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
5160 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
5161 | 0, 0); | |
5162 | BUG_ON(ret); | |
5163 | extent_buffer_get(path->nodes[0]); | |
5164 | eb = path->nodes[0]; | |
5165 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
5166 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
5167 | BUG_ON(ret); | |
5168 | free_extent_buffer(eb); | |
5169 | } | |
1a40e23b | 5170 | |
f82d02d9 | 5171 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 5172 | path->lowest_level = 0; |
1a40e23b ZY |
5173 | return 0; |
5174 | } | |
5175 | ||
5176 | static int noinline relocate_tree_block(struct btrfs_trans_handle *trans, | |
5177 | struct btrfs_root *root, | |
5178 | struct btrfs_path *path, | |
5179 | struct btrfs_key *first_key, | |
5180 | struct btrfs_ref_path *ref_path) | |
5181 | { | |
5182 | int ret; | |
1a40e23b ZY |
5183 | |
5184 | ret = relocate_one_path(trans, root, path, first_key, | |
5185 | ref_path, NULL, NULL); | |
5186 | BUG_ON(ret); | |
5187 | ||
5188 | if (root == root->fs_info->extent_root) | |
5189 | btrfs_extent_post_op(trans, root); | |
1a40e23b ZY |
5190 | |
5191 | return 0; | |
5192 | } | |
5193 | ||
5194 | static int noinline del_extent_zero(struct btrfs_trans_handle *trans, | |
5195 | struct btrfs_root *extent_root, | |
5196 | struct btrfs_path *path, | |
5197 | struct btrfs_key *extent_key) | |
5198 | { | |
5199 | int ret; | |
5200 | ||
1a40e23b ZY |
5201 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
5202 | if (ret) | |
5203 | goto out; | |
5204 | ret = btrfs_del_item(trans, extent_root, path); | |
5205 | out: | |
5206 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
5207 | return ret; |
5208 | } | |
5209 | ||
5210 | static struct btrfs_root noinline *read_ref_root(struct btrfs_fs_info *fs_info, | |
5211 | struct btrfs_ref_path *ref_path) | |
5212 | { | |
5213 | struct btrfs_key root_key; | |
5214 | ||
5215 | root_key.objectid = ref_path->root_objectid; | |
5216 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5217 | if (is_cowonly_root(ref_path->root_objectid)) | |
5218 | root_key.offset = 0; | |
5219 | else | |
5220 | root_key.offset = (u64)-1; | |
5221 | ||
5222 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5223 | } | |
5224 | ||
5225 | static int noinline relocate_one_extent(struct btrfs_root *extent_root, | |
5226 | struct btrfs_path *path, | |
5227 | struct btrfs_key *extent_key, | |
5228 | struct btrfs_block_group_cache *group, | |
5229 | struct inode *reloc_inode, int pass) | |
5230 | { | |
5231 | struct btrfs_trans_handle *trans; | |
5232 | struct btrfs_root *found_root; | |
5233 | struct btrfs_ref_path *ref_path = NULL; | |
5234 | struct disk_extent *new_extents = NULL; | |
5235 | int nr_extents = 0; | |
5236 | int loops; | |
5237 | int ret; | |
5238 | int level; | |
5239 | struct btrfs_key first_key; | |
5240 | u64 prev_block = 0; | |
5241 | ||
1a40e23b ZY |
5242 | |
5243 | trans = btrfs_start_transaction(extent_root, 1); | |
5244 | BUG_ON(!trans); | |
5245 | ||
5246 | if (extent_key->objectid == 0) { | |
5247 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
5248 | goto out; | |
5249 | } | |
5250 | ||
5251 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
5252 | if (!ref_path) { | |
5253 | ret = -ENOMEM; | |
5254 | goto out; | |
5255 | } | |
5256 | ||
5257 | for (loops = 0; ; loops++) { | |
5258 | if (loops == 0) { | |
5259 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
5260 | extent_key->objectid); | |
5261 | } else { | |
5262 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
5263 | } | |
5264 | if (ret < 0) | |
5265 | goto out; | |
5266 | if (ret > 0) | |
5267 | break; | |
5268 | ||
5269 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
5270 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
5271 | continue; | |
5272 | ||
5273 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
5274 | BUG_ON(!found_root); | |
5275 | /* | |
5276 | * for reference counted tree, only process reference paths | |
5277 | * rooted at the latest committed root. | |
5278 | */ | |
5279 | if (found_root->ref_cows && | |
5280 | ref_path->root_generation != found_root->root_key.offset) | |
5281 | continue; | |
5282 | ||
5283 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
5284 | if (pass == 0) { | |
5285 | /* | |
5286 | * copy data extents to new locations | |
5287 | */ | |
5288 | u64 group_start = group->key.objectid; | |
5289 | ret = relocate_data_extent(reloc_inode, | |
5290 | extent_key, | |
5291 | group_start); | |
5292 | if (ret < 0) | |
5293 | goto out; | |
5294 | break; | |
5295 | } | |
5296 | level = 0; | |
5297 | } else { | |
5298 | level = ref_path->owner_objectid; | |
5299 | } | |
5300 | ||
5301 | if (prev_block != ref_path->nodes[level]) { | |
5302 | struct extent_buffer *eb; | |
5303 | u64 block_start = ref_path->nodes[level]; | |
5304 | u64 block_size = btrfs_level_size(found_root, level); | |
5305 | ||
5306 | eb = read_tree_block(found_root, block_start, | |
5307 | block_size, 0); | |
5308 | btrfs_tree_lock(eb); | |
5309 | BUG_ON(level != btrfs_header_level(eb)); | |
5310 | ||
5311 | if (level == 0) | |
5312 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
5313 | else | |
5314 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
5315 | ||
5316 | btrfs_tree_unlock(eb); | |
5317 | free_extent_buffer(eb); | |
5318 | prev_block = block_start; | |
5319 | } | |
5320 | ||
5321 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID && | |
5322 | pass >= 2) { | |
5323 | /* | |
5324 | * use fallback method to process the remaining | |
5325 | * references. | |
5326 | */ | |
5327 | if (!new_extents) { | |
5328 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
5329 | new_extents = kmalloc(sizeof(*new_extents), |
5330 | GFP_NOFS); | |
5331 | nr_extents = 1; | |
1a40e23b ZY |
5332 | ret = get_new_locations(reloc_inode, |
5333 | extent_key, | |
d899e052 | 5334 | group_start, 1, |
1a40e23b ZY |
5335 | &new_extents, |
5336 | &nr_extents); | |
d899e052 | 5337 | if (ret) |
1a40e23b ZY |
5338 | goto out; |
5339 | } | |
5340 | btrfs_record_root_in_trans(found_root); | |
5341 | ret = replace_one_extent(trans, found_root, | |
5342 | path, extent_key, | |
5343 | &first_key, ref_path, | |
5344 | new_extents, nr_extents); | |
5345 | if (ret < 0) | |
5346 | goto out; | |
5347 | continue; | |
5348 | } | |
5349 | ||
5350 | btrfs_record_root_in_trans(found_root); | |
5351 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
5352 | ret = relocate_tree_block(trans, found_root, path, | |
5353 | &first_key, ref_path); | |
5354 | } else { | |
5355 | /* | |
5356 | * try to update data extent references while | |
5357 | * keeping metadata shared between snapshots. | |
5358 | */ | |
5359 | ret = relocate_one_path(trans, found_root, path, | |
5360 | &first_key, ref_path, | |
5361 | group, reloc_inode); | |
5362 | } | |
5363 | if (ret < 0) | |
5364 | goto out; | |
5365 | } | |
5366 | ret = 0; | |
5367 | out: | |
5368 | btrfs_end_transaction(trans, extent_root); | |
5369 | kfree(new_extents); | |
5370 | kfree(ref_path); | |
1a40e23b ZY |
5371 | return ret; |
5372 | } | |
5373 | ||
ec44a35c CM |
5374 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
5375 | { | |
5376 | u64 num_devices; | |
5377 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
5378 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
5379 | ||
a061fc8d | 5380 | num_devices = root->fs_info->fs_devices->num_devices; |
ec44a35c CM |
5381 | if (num_devices == 1) { |
5382 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5383 | stripped = flags & ~stripped; | |
5384 | ||
5385 | /* turn raid0 into single device chunks */ | |
5386 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
5387 | return stripped; | |
5388 | ||
5389 | /* turn mirroring into duplication */ | |
5390 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
5391 | BTRFS_BLOCK_GROUP_RAID10)) | |
5392 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
5393 | return flags; | |
5394 | } else { | |
5395 | /* they already had raid on here, just return */ | |
ec44a35c CM |
5396 | if (flags & stripped) |
5397 | return flags; | |
5398 | ||
5399 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5400 | stripped = flags & ~stripped; | |
5401 | ||
5402 | /* switch duplicated blocks with raid1 */ | |
5403 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
5404 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
5405 | ||
5406 | /* turn single device chunks into raid0 */ | |
5407 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
5408 | } | |
5409 | return flags; | |
5410 | } | |
5411 | ||
0ef3e66b CM |
5412 | int __alloc_chunk_for_shrink(struct btrfs_root *root, |
5413 | struct btrfs_block_group_cache *shrink_block_group, | |
5414 | int force) | |
5415 | { | |
5416 | struct btrfs_trans_handle *trans; | |
5417 | u64 new_alloc_flags; | |
5418 | u64 calc; | |
5419 | ||
c286ac48 | 5420 | spin_lock(&shrink_block_group->lock); |
0ef3e66b | 5421 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
c286ac48 | 5422 | spin_unlock(&shrink_block_group->lock); |
c286ac48 | 5423 | |
0ef3e66b | 5424 | trans = btrfs_start_transaction(root, 1); |
c286ac48 | 5425 | spin_lock(&shrink_block_group->lock); |
7d9eb12c | 5426 | |
0ef3e66b CM |
5427 | new_alloc_flags = update_block_group_flags(root, |
5428 | shrink_block_group->flags); | |
5429 | if (new_alloc_flags != shrink_block_group->flags) { | |
5430 | calc = | |
5431 | btrfs_block_group_used(&shrink_block_group->item); | |
5432 | } else { | |
5433 | calc = shrink_block_group->key.offset; | |
5434 | } | |
c286ac48 CM |
5435 | spin_unlock(&shrink_block_group->lock); |
5436 | ||
0ef3e66b CM |
5437 | do_chunk_alloc(trans, root->fs_info->extent_root, |
5438 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
7d9eb12c | 5439 | |
0ef3e66b | 5440 | btrfs_end_transaction(trans, root); |
c286ac48 CM |
5441 | } else |
5442 | spin_unlock(&shrink_block_group->lock); | |
0ef3e66b CM |
5443 | return 0; |
5444 | } | |
5445 | ||
1a40e23b ZY |
5446 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
5447 | struct btrfs_root *root, | |
5448 | u64 objectid, u64 size) | |
5449 | { | |
5450 | struct btrfs_path *path; | |
5451 | struct btrfs_inode_item *item; | |
5452 | struct extent_buffer *leaf; | |
5453 | int ret; | |
5454 | ||
5455 | path = btrfs_alloc_path(); | |
5456 | if (!path) | |
5457 | return -ENOMEM; | |
5458 | ||
5459 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); | |
5460 | if (ret) | |
5461 | goto out; | |
5462 | ||
5463 | leaf = path->nodes[0]; | |
5464 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); | |
5465 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
5466 | btrfs_set_inode_generation(leaf, item, 1); | |
5467 | btrfs_set_inode_size(leaf, item, size); | |
5468 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); | |
d899e052 YZ |
5469 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NODATASUM | |
5470 | BTRFS_INODE_NOCOMPRESS); | |
1a40e23b ZY |
5471 | btrfs_mark_buffer_dirty(leaf); |
5472 | btrfs_release_path(root, path); | |
5473 | out: | |
5474 | btrfs_free_path(path); | |
5475 | return ret; | |
5476 | } | |
5477 | ||
5478 | static struct inode noinline *create_reloc_inode(struct btrfs_fs_info *fs_info, | |
5479 | struct btrfs_block_group_cache *group) | |
5480 | { | |
5481 | struct inode *inode = NULL; | |
5482 | struct btrfs_trans_handle *trans; | |
5483 | struct btrfs_root *root; | |
5484 | struct btrfs_key root_key; | |
5485 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; | |
5486 | int err = 0; | |
5487 | ||
5488 | root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
5489 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5490 | root_key.offset = (u64)-1; | |
5491 | root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5492 | if (IS_ERR(root)) | |
5493 | return ERR_CAST(root); | |
5494 | ||
5495 | trans = btrfs_start_transaction(root, 1); | |
5496 | BUG_ON(!trans); | |
5497 | ||
5498 | err = btrfs_find_free_objectid(trans, root, objectid, &objectid); | |
5499 | if (err) | |
5500 | goto out; | |
5501 | ||
5502 | err = __insert_orphan_inode(trans, root, objectid, group->key.offset); | |
5503 | BUG_ON(err); | |
5504 | ||
5505 | err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, | |
c8b97818 CM |
5506 | group->key.offset, 0, group->key.offset, |
5507 | 0, 0, 0); | |
1a40e23b ZY |
5508 | BUG_ON(err); |
5509 | ||
5510 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); | |
5511 | if (inode->i_state & I_NEW) { | |
5512 | BTRFS_I(inode)->root = root; | |
5513 | BTRFS_I(inode)->location.objectid = objectid; | |
5514 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
5515 | BTRFS_I(inode)->location.offset = 0; | |
5516 | btrfs_read_locked_inode(inode); | |
5517 | unlock_new_inode(inode); | |
5518 | BUG_ON(is_bad_inode(inode)); | |
5519 | } else { | |
5520 | BUG_ON(1); | |
5521 | } | |
5522 | ||
5523 | err = btrfs_orphan_add(trans, inode); | |
5524 | out: | |
5525 | btrfs_end_transaction(trans, root); | |
5526 | if (err) { | |
5527 | if (inode) | |
5528 | iput(inode); | |
5529 | inode = ERR_PTR(err); | |
5530 | } | |
5531 | return inode; | |
5532 | } | |
5533 | ||
5534 | int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start) | |
edbd8d4e CM |
5535 | { |
5536 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 5537 | struct btrfs_path *path; |
1a40e23b ZY |
5538 | struct btrfs_fs_info *info = root->fs_info; |
5539 | struct extent_buffer *leaf; | |
5540 | struct inode *reloc_inode; | |
5541 | struct btrfs_block_group_cache *block_group; | |
5542 | struct btrfs_key key; | |
d899e052 | 5543 | u64 skipped; |
edbd8d4e CM |
5544 | u64 cur_byte; |
5545 | u64 total_found; | |
edbd8d4e CM |
5546 | u32 nritems; |
5547 | int ret; | |
a061fc8d | 5548 | int progress; |
1a40e23b | 5549 | int pass = 0; |
edbd8d4e | 5550 | |
1a40e23b ZY |
5551 | root = root->fs_info->extent_root; |
5552 | ||
5553 | block_group = btrfs_lookup_block_group(info, group_start); | |
5554 | BUG_ON(!block_group); | |
8f18cf13 | 5555 | |
1a40e23b ZY |
5556 | printk("btrfs relocating block group %llu flags %llu\n", |
5557 | (unsigned long long)block_group->key.objectid, | |
5558 | (unsigned long long)block_group->flags); | |
8f18cf13 | 5559 | |
edbd8d4e | 5560 | path = btrfs_alloc_path(); |
1a40e23b | 5561 | BUG_ON(!path); |
edbd8d4e | 5562 | |
1a40e23b ZY |
5563 | reloc_inode = create_reloc_inode(info, block_group); |
5564 | BUG_ON(IS_ERR(reloc_inode)); | |
323da79c | 5565 | |
1a40e23b | 5566 | __alloc_chunk_for_shrink(root, block_group, 1); |
c146afad | 5567 | set_block_group_readonly(block_group); |
323da79c | 5568 | |
1a40e23b ZY |
5569 | btrfs_start_delalloc_inodes(info->tree_root); |
5570 | btrfs_wait_ordered_extents(info->tree_root, 0); | |
5571 | again: | |
d899e052 | 5572 | skipped = 0; |
edbd8d4e | 5573 | total_found = 0; |
a061fc8d | 5574 | progress = 0; |
1a40e23b | 5575 | key.objectid = block_group->key.objectid; |
edbd8d4e CM |
5576 | key.offset = 0; |
5577 | key.type = 0; | |
73e48b27 | 5578 | cur_byte = key.objectid; |
4313b399 | 5579 | |
1a40e23b ZY |
5580 | trans = btrfs_start_transaction(info->tree_root, 1); |
5581 | btrfs_commit_transaction(trans, info->tree_root); | |
ea8c2819 | 5582 | |
1a40e23b ZY |
5583 | mutex_lock(&root->fs_info->cleaner_mutex); |
5584 | btrfs_clean_old_snapshots(info->tree_root); | |
5585 | btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1); | |
5586 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
ea8c2819 | 5587 | |
73e48b27 | 5588 | while(1) { |
edbd8d4e CM |
5589 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5590 | if (ret < 0) | |
5591 | goto out; | |
7d9eb12c | 5592 | next: |
edbd8d4e | 5593 | leaf = path->nodes[0]; |
73e48b27 | 5594 | nritems = btrfs_header_nritems(leaf); |
73e48b27 Y |
5595 | if (path->slots[0] >= nritems) { |
5596 | ret = btrfs_next_leaf(root, path); | |
5597 | if (ret < 0) | |
5598 | goto out; | |
5599 | if (ret == 1) { | |
5600 | ret = 0; | |
5601 | break; | |
edbd8d4e | 5602 | } |
73e48b27 Y |
5603 | leaf = path->nodes[0]; |
5604 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 5605 | } |
73e48b27 | 5606 | |
1a40e23b | 5607 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
725c8463 | 5608 | |
1a40e23b ZY |
5609 | if (key.objectid >= block_group->key.objectid + |
5610 | block_group->key.offset) | |
8f18cf13 CM |
5611 | break; |
5612 | ||
725c8463 | 5613 | if (progress && need_resched()) { |
725c8463 | 5614 | btrfs_release_path(root, path); |
1a40e23b | 5615 | cond_resched(); |
725c8463 | 5616 | progress = 0; |
1a40e23b | 5617 | continue; |
725c8463 CM |
5618 | } |
5619 | progress = 1; | |
5620 | ||
1a40e23b ZY |
5621 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY || |
5622 | key.objectid + key.offset <= cur_byte) { | |
edbd8d4e | 5623 | path->slots[0]++; |
edbd8d4e CM |
5624 | goto next; |
5625 | } | |
73e48b27 | 5626 | |
edbd8d4e | 5627 | total_found++; |
1a40e23b | 5628 | cur_byte = key.objectid + key.offset; |
edbd8d4e | 5629 | btrfs_release_path(root, path); |
edbd8d4e | 5630 | |
1a40e23b ZY |
5631 | __alloc_chunk_for_shrink(root, block_group, 0); |
5632 | ret = relocate_one_extent(root, path, &key, block_group, | |
5633 | reloc_inode, pass); | |
5634 | BUG_ON(ret < 0); | |
d899e052 YZ |
5635 | if (ret > 0) |
5636 | skipped++; | |
edbd8d4e | 5637 | |
1a40e23b ZY |
5638 | key.objectid = cur_byte; |
5639 | key.type = 0; | |
5640 | key.offset = 0; | |
edbd8d4e CM |
5641 | } |
5642 | ||
1a40e23b | 5643 | btrfs_release_path(root, path); |
7d9eb12c | 5644 | |
1a40e23b ZY |
5645 | if (pass == 0) { |
5646 | btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1); | |
5647 | invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1); | |
5648 | WARN_ON(reloc_inode->i_mapping->nrpages); | |
8e8a1e31 | 5649 | } |
73e48b27 | 5650 | |
1a40e23b ZY |
5651 | if (total_found > 0) { |
5652 | printk("btrfs found %llu extents in pass %d\n", | |
5653 | (unsigned long long)total_found, pass); | |
5654 | pass++; | |
d899e052 YZ |
5655 | if (total_found == skipped && pass > 2) { |
5656 | iput(reloc_inode); | |
5657 | reloc_inode = create_reloc_inode(info, block_group); | |
5658 | pass = 0; | |
5659 | } | |
1a40e23b | 5660 | goto again; |
0f9dd46c | 5661 | } |
0ef3e66b | 5662 | |
1a40e23b ZY |
5663 | /* delete reloc_inode */ |
5664 | iput(reloc_inode); | |
5665 | ||
5666 | /* unpin extents in this range */ | |
5667 | trans = btrfs_start_transaction(info->tree_root, 1); | |
5668 | btrfs_commit_transaction(trans, info->tree_root); | |
0ef3e66b | 5669 | |
1a40e23b ZY |
5670 | spin_lock(&block_group->lock); |
5671 | WARN_ON(block_group->pinned > 0); | |
5672 | WARN_ON(block_group->reserved > 0); | |
5673 | WARN_ON(btrfs_block_group_used(&block_group->item) > 0); | |
5674 | spin_unlock(&block_group->lock); | |
5675 | ret = 0; | |
edbd8d4e | 5676 | out: |
1a40e23b | 5677 | btrfs_free_path(path); |
edbd8d4e CM |
5678 | return ret; |
5679 | } | |
5680 | ||
0b86a832 CM |
5681 | int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path, |
5682 | struct btrfs_key *key) | |
5683 | { | |
925baedd | 5684 | int ret = 0; |
0b86a832 CM |
5685 | struct btrfs_key found_key; |
5686 | struct extent_buffer *leaf; | |
5687 | int slot; | |
edbd8d4e | 5688 | |
0b86a832 CM |
5689 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
5690 | if (ret < 0) | |
925baedd CM |
5691 | goto out; |
5692 | ||
0b86a832 CM |
5693 | while(1) { |
5694 | slot = path->slots[0]; | |
edbd8d4e | 5695 | leaf = path->nodes[0]; |
0b86a832 CM |
5696 | if (slot >= btrfs_header_nritems(leaf)) { |
5697 | ret = btrfs_next_leaf(root, path); | |
5698 | if (ret == 0) | |
5699 | continue; | |
5700 | if (ret < 0) | |
925baedd | 5701 | goto out; |
0b86a832 | 5702 | break; |
edbd8d4e | 5703 | } |
0b86a832 | 5704 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 5705 | |
0b86a832 | 5706 | if (found_key.objectid >= key->objectid && |
925baedd CM |
5707 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5708 | ret = 0; | |
5709 | goto out; | |
5710 | } | |
0b86a832 | 5711 | path->slots[0]++; |
edbd8d4e | 5712 | } |
0b86a832 | 5713 | ret = -ENOENT; |
925baedd | 5714 | out: |
0b86a832 | 5715 | return ret; |
edbd8d4e CM |
5716 | } |
5717 | ||
1a40e23b ZY |
5718 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
5719 | { | |
5720 | struct btrfs_block_group_cache *block_group; | |
5721 | struct rb_node *n; | |
5722 | ||
1a40e23b ZY |
5723 | spin_lock(&info->block_group_cache_lock); |
5724 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
5725 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
5726 | cache_node); | |
1a40e23b ZY |
5727 | rb_erase(&block_group->cache_node, |
5728 | &info->block_group_cache_tree); | |
d899e052 YZ |
5729 | spin_unlock(&info->block_group_cache_lock); |
5730 | ||
5731 | btrfs_remove_free_space_cache(block_group); | |
80eb234a | 5732 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5733 | list_del(&block_group->list); |
80eb234a | 5734 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 5735 | kfree(block_group); |
d899e052 YZ |
5736 | |
5737 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
5738 | } |
5739 | spin_unlock(&info->block_group_cache_lock); | |
1a40e23b ZY |
5740 | return 0; |
5741 | } | |
5742 | ||
9078a3e1 CM |
5743 | int btrfs_read_block_groups(struct btrfs_root *root) |
5744 | { | |
5745 | struct btrfs_path *path; | |
5746 | int ret; | |
9078a3e1 | 5747 | struct btrfs_block_group_cache *cache; |
be744175 | 5748 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 5749 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
5750 | struct btrfs_key key; |
5751 | struct btrfs_key found_key; | |
5f39d397 | 5752 | struct extent_buffer *leaf; |
96b5179d | 5753 | |
be744175 | 5754 | root = info->extent_root; |
9078a3e1 | 5755 | key.objectid = 0; |
0b86a832 | 5756 | key.offset = 0; |
9078a3e1 | 5757 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
5758 | path = btrfs_alloc_path(); |
5759 | if (!path) | |
5760 | return -ENOMEM; | |
5761 | ||
5762 | while(1) { | |
0b86a832 CM |
5763 | ret = find_first_block_group(root, path, &key); |
5764 | if (ret > 0) { | |
5765 | ret = 0; | |
5766 | goto error; | |
9078a3e1 | 5767 | } |
0b86a832 CM |
5768 | if (ret != 0) |
5769 | goto error; | |
5770 | ||
5f39d397 CM |
5771 | leaf = path->nodes[0]; |
5772 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 5773 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 5774 | if (!cache) { |
0b86a832 | 5775 | ret = -ENOMEM; |
9078a3e1 CM |
5776 | break; |
5777 | } | |
3e1ad54f | 5778 | |
c286ac48 | 5779 | spin_lock_init(&cache->lock); |
25179201 | 5780 | mutex_init(&cache->alloc_mutex); |
0f9dd46c | 5781 | INIT_LIST_HEAD(&cache->list); |
5f39d397 CM |
5782 | read_extent_buffer(leaf, &cache->item, |
5783 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
5784 | sizeof(cache->item)); | |
9078a3e1 | 5785 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 5786 | |
9078a3e1 CM |
5787 | key.objectid = found_key.objectid + found_key.offset; |
5788 | btrfs_release_path(root, path); | |
0b86a832 | 5789 | cache->flags = btrfs_block_group_flags(&cache->item); |
96b5179d | 5790 | |
6324fbf3 CM |
5791 | ret = update_space_info(info, cache->flags, found_key.offset, |
5792 | btrfs_block_group_used(&cache->item), | |
5793 | &space_info); | |
5794 | BUG_ON(ret); | |
5795 | cache->space_info = space_info; | |
80eb234a JB |
5796 | down_write(&space_info->groups_sem); |
5797 | list_add_tail(&cache->list, &space_info->block_groups); | |
5798 | up_write(&space_info->groups_sem); | |
0f9dd46c JB |
5799 | |
5800 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
5801 | BUG_ON(ret); | |
75ccf47d CM |
5802 | |
5803 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
9078a3e1 | 5804 | } |
0b86a832 CM |
5805 | ret = 0; |
5806 | error: | |
9078a3e1 | 5807 | btrfs_free_path(path); |
0b86a832 | 5808 | return ret; |
9078a3e1 | 5809 | } |
6324fbf3 CM |
5810 | |
5811 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
5812 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 5813 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
5814 | u64 size) |
5815 | { | |
5816 | int ret; | |
6324fbf3 CM |
5817 | struct btrfs_root *extent_root; |
5818 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
5819 | |
5820 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 5821 | |
e02119d5 CM |
5822 | root->fs_info->last_trans_new_blockgroup = trans->transid; |
5823 | ||
8f18cf13 | 5824 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
5825 | if (!cache) |
5826 | return -ENOMEM; | |
5827 | ||
e17cade2 | 5828 | cache->key.objectid = chunk_offset; |
6324fbf3 | 5829 | cache->key.offset = size; |
c286ac48 | 5830 | spin_lock_init(&cache->lock); |
25179201 | 5831 | mutex_init(&cache->alloc_mutex); |
0f9dd46c | 5832 | INIT_LIST_HEAD(&cache->list); |
6324fbf3 | 5833 | btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
0ef3e66b | 5834 | |
6324fbf3 | 5835 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
5836 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
5837 | cache->flags = type; | |
5838 | btrfs_set_block_group_flags(&cache->item, type); | |
5839 | ||
5840 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
5841 | &cache->space_info); | |
5842 | BUG_ON(ret); | |
80eb234a JB |
5843 | down_write(&cache->space_info->groups_sem); |
5844 | list_add_tail(&cache->list, &cache->space_info->block_groups); | |
5845 | up_write(&cache->space_info->groups_sem); | |
6324fbf3 | 5846 | |
0f9dd46c JB |
5847 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
5848 | BUG_ON(ret); | |
c286ac48 | 5849 | |
6324fbf3 CM |
5850 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
5851 | sizeof(cache->item)); | |
5852 | BUG_ON(ret); | |
5853 | ||
87ef2bb4 CM |
5854 | finish_current_insert(trans, extent_root, 0); |
5855 | ret = del_pending_extents(trans, extent_root, 0); | |
6324fbf3 | 5856 | BUG_ON(ret); |
d18a2c44 | 5857 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 5858 | |
6324fbf3 CM |
5859 | return 0; |
5860 | } | |
1a40e23b ZY |
5861 | |
5862 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
5863 | struct btrfs_root *root, u64 group_start) | |
5864 | { | |
5865 | struct btrfs_path *path; | |
5866 | struct btrfs_block_group_cache *block_group; | |
5867 | struct btrfs_key key; | |
5868 | int ret; | |
5869 | ||
1a40e23b ZY |
5870 | root = root->fs_info->extent_root; |
5871 | ||
5872 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
5873 | BUG_ON(!block_group); | |
c146afad | 5874 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
5875 | |
5876 | memcpy(&key, &block_group->key, sizeof(key)); | |
5877 | ||
5878 | path = btrfs_alloc_path(); | |
5879 | BUG_ON(!path); | |
5880 | ||
5881 | btrfs_remove_free_space_cache(block_group); | |
5882 | rb_erase(&block_group->cache_node, | |
5883 | &root->fs_info->block_group_cache_tree); | |
80eb234a | 5884 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5885 | list_del(&block_group->list); |
80eb234a | 5886 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 5887 | |
c146afad YZ |
5888 | spin_lock(&block_group->space_info->lock); |
5889 | block_group->space_info->total_bytes -= block_group->key.offset; | |
5890 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
5891 | spin_unlock(&block_group->space_info->lock); | |
5892 | ||
1a40e23b ZY |
5893 | /* |
5894 | memset(shrink_block_group, 0, sizeof(*shrink_block_group)); | |
5895 | kfree(shrink_block_group); | |
5896 | */ | |
5897 | ||
5898 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
5899 | if (ret > 0) | |
5900 | ret = -EIO; | |
5901 | if (ret < 0) | |
5902 | goto out; | |
5903 | ||
5904 | ret = btrfs_del_item(trans, root, path); | |
5905 | out: | |
5906 | btrfs_free_path(path); | |
5907 | return ret; | |
5908 | } |