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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4b4e25f2 | 23 | #include "compat.h" |
74493f7a | 24 | #include "hash.h" |
a5eb62e3 | 25 | #include "crc32c.h" |
fec577fb CM |
26 | #include "ctree.h" |
27 | #include "disk-io.h" | |
28 | #include "print-tree.h" | |
e089f05c | 29 | #include "transaction.h" |
0b86a832 | 30 | #include "volumes.h" |
925baedd | 31 | #include "locking.h" |
31153d81 | 32 | #include "ref-cache.h" |
fec577fb | 33 | |
31840ae1 ZY |
34 | #define PENDING_EXTENT_INSERT 0 |
35 | #define PENDING_EXTENT_DELETE 1 | |
36 | #define PENDING_BACKREF_UPDATE 2 | |
37 | ||
38 | struct pending_extent_op { | |
39 | int type; | |
40 | u64 bytenr; | |
41 | u64 num_bytes; | |
42 | u64 parent; | |
43 | u64 orig_parent; | |
44 | u64 generation; | |
45 | u64 orig_generation; | |
46 | int level; | |
f3465ca4 JB |
47 | struct list_head list; |
48 | int del; | |
31840ae1 ZY |
49 | }; |
50 | ||
d397712b CM |
51 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
52 | struct btrfs_root *extent_root, int all); | |
53 | static int del_pending_extents(struct btrfs_trans_handle *trans, | |
54 | struct btrfs_root *extent_root, int all); | |
f3465ca4 JB |
55 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
56 | struct btrfs_root *root, | |
57 | u64 bytenr, u64 num_bytes, int is_data); | |
58 | static int update_block_group(struct btrfs_trans_handle *trans, | |
59 | struct btrfs_root *root, | |
60 | u64 bytenr, u64 num_bytes, int alloc, | |
61 | int mark_free); | |
d548ee51 | 62 | |
0f9dd46c JB |
63 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
64 | { | |
65 | return (cache->flags & bits) == bits; | |
66 | } | |
67 | ||
68 | /* | |
69 | * this adds the block group to the fs_info rb tree for the block group | |
70 | * cache | |
71 | */ | |
b2950863 | 72 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
73 | struct btrfs_block_group_cache *block_group) |
74 | { | |
75 | struct rb_node **p; | |
76 | struct rb_node *parent = NULL; | |
77 | struct btrfs_block_group_cache *cache; | |
78 | ||
79 | spin_lock(&info->block_group_cache_lock); | |
80 | p = &info->block_group_cache_tree.rb_node; | |
81 | ||
82 | while (*p) { | |
83 | parent = *p; | |
84 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
85 | cache_node); | |
86 | if (block_group->key.objectid < cache->key.objectid) { | |
87 | p = &(*p)->rb_left; | |
88 | } else if (block_group->key.objectid > cache->key.objectid) { | |
89 | p = &(*p)->rb_right; | |
90 | } else { | |
91 | spin_unlock(&info->block_group_cache_lock); | |
92 | return -EEXIST; | |
93 | } | |
94 | } | |
95 | ||
96 | rb_link_node(&block_group->cache_node, parent, p); | |
97 | rb_insert_color(&block_group->cache_node, | |
98 | &info->block_group_cache_tree); | |
99 | spin_unlock(&info->block_group_cache_lock); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | /* | |
105 | * This will return the block group at or after bytenr if contains is 0, else | |
106 | * it will return the block group that contains the bytenr | |
107 | */ | |
108 | static struct btrfs_block_group_cache * | |
109 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
110 | int contains) | |
111 | { | |
112 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
113 | struct rb_node *n; | |
114 | u64 end, start; | |
115 | ||
116 | spin_lock(&info->block_group_cache_lock); | |
117 | n = info->block_group_cache_tree.rb_node; | |
118 | ||
119 | while (n) { | |
120 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
121 | cache_node); | |
122 | end = cache->key.objectid + cache->key.offset - 1; | |
123 | start = cache->key.objectid; | |
124 | ||
125 | if (bytenr < start) { | |
126 | if (!contains && (!ret || start < ret->key.objectid)) | |
127 | ret = cache; | |
128 | n = n->rb_left; | |
129 | } else if (bytenr > start) { | |
130 | if (contains && bytenr <= end) { | |
131 | ret = cache; | |
132 | break; | |
133 | } | |
134 | n = n->rb_right; | |
135 | } else { | |
136 | ret = cache; | |
137 | break; | |
138 | } | |
139 | } | |
d2fb3437 YZ |
140 | if (ret) |
141 | atomic_inc(&ret->count); | |
0f9dd46c JB |
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; | |
ea6a478e JB |
170 | ret = btrfs_add_free_space(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; | |
ea6a478e | 181 | ret = btrfs_add_free_space(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 | ||
a512bbf8 YZ |
189 | static int remove_sb_from_cache(struct btrfs_root *root, |
190 | struct btrfs_block_group_cache *cache) | |
191 | { | |
192 | u64 bytenr; | |
193 | u64 *logical; | |
194 | int stripe_len; | |
195 | int i, nr, ret; | |
196 | ||
197 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
198 | bytenr = btrfs_sb_offset(i); | |
199 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
200 | cache->key.objectid, bytenr, 0, | |
201 | &logical, &nr, &stripe_len); | |
202 | BUG_ON(ret); | |
203 | while (nr--) { | |
204 | btrfs_remove_free_space(cache, logical[nr], | |
205 | stripe_len); | |
206 | } | |
207 | kfree(logical); | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
e37c9e69 CM |
212 | static int cache_block_group(struct btrfs_root *root, |
213 | struct btrfs_block_group_cache *block_group) | |
214 | { | |
215 | struct btrfs_path *path; | |
ef8bbdfe | 216 | int ret = 0; |
e37c9e69 | 217 | struct btrfs_key key; |
5f39d397 | 218 | struct extent_buffer *leaf; |
e37c9e69 | 219 | int slot; |
e4404d6e | 220 | u64 last; |
e37c9e69 | 221 | |
00f5c795 CM |
222 | if (!block_group) |
223 | return 0; | |
224 | ||
e37c9e69 | 225 | root = root->fs_info->extent_root; |
e37c9e69 CM |
226 | |
227 | if (block_group->cached) | |
228 | return 0; | |
f510cfec | 229 | |
e37c9e69 CM |
230 | path = btrfs_alloc_path(); |
231 | if (!path) | |
232 | return -ENOMEM; | |
7d7d6068 | 233 | |
2cc58cf2 | 234 | path->reada = 2; |
5cd57b2c CM |
235 | /* |
236 | * we get into deadlocks with paths held by callers of this function. | |
237 | * since the alloc_mutex is protecting things right now, just | |
238 | * skip the locking here | |
239 | */ | |
240 | path->skip_locking = 1; | |
e4404d6e YZ |
241 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
242 | key.objectid = last; | |
e37c9e69 CM |
243 | key.offset = 0; |
244 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
245 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
246 | if (ret < 0) | |
ef8bbdfe | 247 | goto err; |
a512bbf8 | 248 | |
d397712b | 249 | while (1) { |
5f39d397 | 250 | leaf = path->nodes[0]; |
e37c9e69 | 251 | slot = path->slots[0]; |
5f39d397 | 252 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 253 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
254 | if (ret < 0) |
255 | goto err; | |
0f9dd46c | 256 | if (ret == 0) |
e37c9e69 | 257 | continue; |
0f9dd46c | 258 | else |
e37c9e69 | 259 | break; |
e37c9e69 | 260 | } |
5f39d397 | 261 | btrfs_item_key_to_cpu(leaf, &key, slot); |
0f9dd46c | 262 | if (key.objectid < block_group->key.objectid) |
7d7d6068 | 263 | goto next; |
0f9dd46c | 264 | |
e37c9e69 | 265 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 266 | block_group->key.offset) |
e37c9e69 | 267 | break; |
7d7d6068 | 268 | |
e37c9e69 | 269 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
0f9dd46c JB |
270 | add_new_free_space(block_group, root->fs_info, last, |
271 | key.objectid); | |
272 | ||
7d7d6068 | 273 | last = key.objectid + key.offset; |
e37c9e69 | 274 | } |
7d7d6068 | 275 | next: |
e37c9e69 CM |
276 | path->slots[0]++; |
277 | } | |
278 | ||
0f9dd46c JB |
279 | add_new_free_space(block_group, root->fs_info, last, |
280 | block_group->key.objectid + | |
281 | block_group->key.offset); | |
282 | ||
a512bbf8 | 283 | remove_sb_from_cache(root, block_group); |
e37c9e69 | 284 | block_group->cached = 1; |
ef8bbdfe | 285 | ret = 0; |
54aa1f4d | 286 | err: |
e37c9e69 | 287 | btrfs_free_path(path); |
ef8bbdfe | 288 | return ret; |
e37c9e69 CM |
289 | } |
290 | ||
0f9dd46c JB |
291 | /* |
292 | * return the block group that starts at or after bytenr | |
293 | */ | |
d397712b CM |
294 | static struct btrfs_block_group_cache * |
295 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 296 | { |
0f9dd46c | 297 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 298 | |
0f9dd46c | 299 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 300 | |
0f9dd46c | 301 | return cache; |
0ef3e66b CM |
302 | } |
303 | ||
0f9dd46c JB |
304 | /* |
305 | * return the block group that contains teh given bytenr | |
306 | */ | |
d397712b CM |
307 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
308 | struct btrfs_fs_info *info, | |
309 | u64 bytenr) | |
be744175 | 310 | { |
0f9dd46c | 311 | struct btrfs_block_group_cache *cache; |
be744175 | 312 | |
0f9dd46c | 313 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 314 | |
0f9dd46c | 315 | return cache; |
be744175 | 316 | } |
0b86a832 | 317 | |
d2fb3437 YZ |
318 | static inline void put_block_group(struct btrfs_block_group_cache *cache) |
319 | { | |
320 | if (atomic_dec_and_test(&cache->count)) | |
321 | kfree(cache); | |
322 | } | |
323 | ||
0f9dd46c JB |
324 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
325 | u64 flags) | |
6324fbf3 | 326 | { |
0f9dd46c | 327 | struct list_head *head = &info->space_info; |
0f9dd46c | 328 | struct btrfs_space_info *found; |
c6e30871 | 329 | list_for_each_entry(found, head, list) { |
0f9dd46c JB |
330 | if (found->flags == flags) |
331 | return found; | |
332 | } | |
333 | return NULL; | |
6324fbf3 CM |
334 | } |
335 | ||
80eb234a JB |
336 | static u64 div_factor(u64 num, int factor) |
337 | { | |
338 | if (factor == 10) | |
339 | return num; | |
340 | num *= factor; | |
341 | do_div(num, 10); | |
342 | return num; | |
343 | } | |
344 | ||
d2fb3437 YZ |
345 | u64 btrfs_find_block_group(struct btrfs_root *root, |
346 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 347 | { |
96b5179d | 348 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 349 | u64 used; |
d2fb3437 YZ |
350 | u64 last = max(search_hint, search_start); |
351 | u64 group_start = 0; | |
31f3c99b | 352 | int full_search = 0; |
d2fb3437 | 353 | int factor = 9; |
0ef3e66b | 354 | int wrapped = 0; |
31f3c99b | 355 | again: |
e8569813 ZY |
356 | while (1) { |
357 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
358 | if (!cache) |
359 | break; | |
96b5179d | 360 | |
c286ac48 | 361 | spin_lock(&cache->lock); |
96b5179d CM |
362 | last = cache->key.objectid + cache->key.offset; |
363 | used = btrfs_block_group_used(&cache->item); | |
364 | ||
d2fb3437 YZ |
365 | if ((full_search || !cache->ro) && |
366 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 367 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
368 | div_factor(cache->key.offset, factor)) { |
369 | group_start = cache->key.objectid; | |
c286ac48 | 370 | spin_unlock(&cache->lock); |
d2fb3437 | 371 | put_block_group(cache); |
8790d502 CM |
372 | goto found; |
373 | } | |
6324fbf3 | 374 | } |
c286ac48 | 375 | spin_unlock(&cache->lock); |
d2fb3437 | 376 | put_block_group(cache); |
de428b63 | 377 | cond_resched(); |
cd1bc465 | 378 | } |
0ef3e66b CM |
379 | if (!wrapped) { |
380 | last = search_start; | |
381 | wrapped = 1; | |
382 | goto again; | |
383 | } | |
384 | if (!full_search && factor < 10) { | |
be744175 | 385 | last = search_start; |
31f3c99b | 386 | full_search = 1; |
0ef3e66b | 387 | factor = 10; |
31f3c99b CM |
388 | goto again; |
389 | } | |
be744175 | 390 | found: |
d2fb3437 | 391 | return group_start; |
925baedd | 392 | } |
0f9dd46c | 393 | |
e02119d5 | 394 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 395 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
396 | { |
397 | int ret; | |
398 | struct btrfs_key key; | |
31840ae1 | 399 | struct btrfs_path *path; |
e02119d5 | 400 | |
31840ae1 ZY |
401 | path = btrfs_alloc_path(); |
402 | BUG_ON(!path); | |
e02119d5 CM |
403 | key.objectid = start; |
404 | key.offset = len; | |
405 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
406 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
407 | 0, 0); | |
31840ae1 | 408 | btrfs_free_path(path); |
7bb86316 CM |
409 | return ret; |
410 | } | |
411 | ||
d8d5f3e1 CM |
412 | /* |
413 | * Back reference rules. Back refs have three main goals: | |
414 | * | |
415 | * 1) differentiate between all holders of references to an extent so that | |
416 | * when a reference is dropped we can make sure it was a valid reference | |
417 | * before freeing the extent. | |
418 | * | |
419 | * 2) Provide enough information to quickly find the holders of an extent | |
420 | * if we notice a given block is corrupted or bad. | |
421 | * | |
422 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
423 | * maintenance. This is actually the same as #2, but with a slightly | |
424 | * different use case. | |
425 | * | |
426 | * File extents can be referenced by: | |
427 | * | |
428 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 429 | * - different files inside a single subvolume |
d8d5f3e1 CM |
430 | * - different offsets inside a file (bookend extents in file.c) |
431 | * | |
432 | * The extent ref structure has fields for: | |
433 | * | |
434 | * - Objectid of the subvolume root | |
435 | * - Generation number of the tree holding the reference | |
436 | * - objectid of the file holding the reference | |
31840ae1 ZY |
437 | * - number of references holding by parent node (alway 1 for tree blocks) |
438 | * | |
439 | * Btree leaf may hold multiple references to a file extent. In most cases, | |
440 | * these references are from same file and the corresponding offsets inside | |
3bb1a1bc | 441 | * the file are close together. |
d8d5f3e1 CM |
442 | * |
443 | * When a file extent is allocated the fields are filled in: | |
3bb1a1bc | 444 | * (root_key.objectid, trans->transid, inode objectid, 1) |
d8d5f3e1 CM |
445 | * |
446 | * When a leaf is cow'd new references are added for every file extent found | |
31840ae1 ZY |
447 | * in the leaf. It looks similar to the create case, but trans->transid will |
448 | * be different when the block is cow'd. | |
d8d5f3e1 | 449 | * |
3bb1a1bc | 450 | * (root_key.objectid, trans->transid, inode objectid, |
31840ae1 | 451 | * number of references in the leaf) |
d8d5f3e1 | 452 | * |
3bb1a1bc YZ |
453 | * When a file extent is removed either during snapshot deletion or |
454 | * file truncation, we find the corresponding back reference and check | |
455 | * the following fields: | |
d8d5f3e1 | 456 | * |
3bb1a1bc YZ |
457 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
458 | * inode objectid) | |
d8d5f3e1 CM |
459 | * |
460 | * Btree extents can be referenced by: | |
461 | * | |
462 | * - Different subvolumes | |
463 | * - Different generations of the same subvolume | |
464 | * | |
d8d5f3e1 CM |
465 | * When a tree block is created, back references are inserted: |
466 | * | |
3bb1a1bc | 467 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 468 | * |
31840ae1 ZY |
469 | * When a tree block is cow'd, new back references are added for all the |
470 | * blocks it points to. If the tree block isn't in reference counted root, | |
471 | * the old back references are removed. These new back references are of | |
472 | * the form (trans->transid will have increased since creation): | |
d8d5f3e1 | 473 | * |
3bb1a1bc | 474 | * (root->root_key.objectid, trans->transid, level, 1) |
d8d5f3e1 | 475 | * |
31840ae1 | 476 | * When a backref is in deleting, the following fields are checked: |
d8d5f3e1 CM |
477 | * |
478 | * if backref was for a tree root: | |
3bb1a1bc | 479 | * (btrfs_header_owner(itself), btrfs_header_generation(itself), level) |
d8d5f3e1 | 480 | * else |
3bb1a1bc | 481 | * (btrfs_header_owner(parent), btrfs_header_generation(parent), level) |
d8d5f3e1 | 482 | * |
31840ae1 | 483 | * Back Reference Key composing: |
d8d5f3e1 | 484 | * |
31840ae1 ZY |
485 | * The key objectid corresponds to the first byte in the extent, the key |
486 | * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first | |
487 | * byte of parent extent. If a extent is tree root, the key offset is set | |
488 | * to the key objectid. | |
d8d5f3e1 | 489 | */ |
31840ae1 | 490 | |
d397712b | 491 | static noinline int lookup_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 | 492 | struct btrfs_root *root, |
3bb1a1bc YZ |
493 | struct btrfs_path *path, |
494 | u64 bytenr, u64 parent, | |
495 | u64 ref_root, u64 ref_generation, | |
496 | u64 owner_objectid, int del) | |
7bb86316 | 497 | { |
7bb86316 | 498 | struct btrfs_key key; |
31840ae1 ZY |
499 | struct btrfs_extent_ref *ref; |
500 | struct extent_buffer *leaf; | |
3bb1a1bc | 501 | u64 ref_objectid; |
74493f7a CM |
502 | int ret; |
503 | ||
31840ae1 ZY |
504 | key.objectid = bytenr; |
505 | key.type = BTRFS_EXTENT_REF_KEY; | |
506 | key.offset = parent; | |
507 | ||
508 | ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); | |
509 | if (ret < 0) | |
510 | goto out; | |
511 | if (ret > 0) { | |
512 | ret = -ENOENT; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | leaf = path->nodes[0]; | |
517 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
3bb1a1bc | 518 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
31840ae1 | 519 | if (btrfs_ref_root(leaf, ref) != ref_root || |
3bb1a1bc YZ |
520 | btrfs_ref_generation(leaf, ref) != ref_generation || |
521 | (ref_objectid != owner_objectid && | |
522 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { | |
31840ae1 ZY |
523 | ret = -EIO; |
524 | WARN_ON(1); | |
525 | goto out; | |
526 | } | |
527 | ret = 0; | |
528 | out: | |
529 | return ret; | |
530 | } | |
531 | ||
f3465ca4 JB |
532 | /* |
533 | * updates all the backrefs that are pending on update_list for the | |
534 | * extent_root | |
535 | */ | |
d397712b | 536 | static noinline int update_backrefs(struct btrfs_trans_handle *trans, |
f3465ca4 JB |
537 | struct btrfs_root *extent_root, |
538 | struct btrfs_path *path, | |
539 | struct list_head *update_list) | |
540 | { | |
541 | struct btrfs_key key; | |
542 | struct btrfs_extent_ref *ref; | |
543 | struct btrfs_fs_info *info = extent_root->fs_info; | |
544 | struct pending_extent_op *op; | |
545 | struct extent_buffer *leaf; | |
546 | int ret = 0; | |
547 | struct list_head *cur = update_list->next; | |
548 | u64 ref_objectid; | |
549 | u64 ref_root = extent_root->root_key.objectid; | |
550 | ||
551 | op = list_entry(cur, struct pending_extent_op, list); | |
552 | ||
553 | search: | |
554 | key.objectid = op->bytenr; | |
555 | key.type = BTRFS_EXTENT_REF_KEY; | |
556 | key.offset = op->orig_parent; | |
557 | ||
558 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 1); | |
559 | BUG_ON(ret); | |
560 | ||
561 | leaf = path->nodes[0]; | |
562 | ||
563 | loop: | |
564 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
565 | ||
566 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
567 | ||
568 | if (btrfs_ref_root(leaf, ref) != ref_root || | |
569 | btrfs_ref_generation(leaf, ref) != op->orig_generation || | |
570 | (ref_objectid != op->level && | |
571 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { | |
d397712b CM |
572 | printk(KERN_ERR "btrfs couldn't find %llu, parent %llu, " |
573 | "root %llu, owner %u\n", | |
574 | (unsigned long long)op->bytenr, | |
575 | (unsigned long long)op->orig_parent, | |
576 | (unsigned long long)ref_root, op->level); | |
f3465ca4 JB |
577 | btrfs_print_leaf(extent_root, leaf); |
578 | BUG(); | |
579 | } | |
580 | ||
581 | key.objectid = op->bytenr; | |
582 | key.offset = op->parent; | |
583 | key.type = BTRFS_EXTENT_REF_KEY; | |
584 | ret = btrfs_set_item_key_safe(trans, extent_root, path, &key); | |
585 | BUG_ON(ret); | |
586 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
587 | btrfs_set_ref_generation(leaf, ref, op->generation); | |
588 | ||
589 | cur = cur->next; | |
590 | ||
591 | list_del_init(&op->list); | |
592 | unlock_extent(&info->extent_ins, op->bytenr, | |
593 | op->bytenr + op->num_bytes - 1, GFP_NOFS); | |
594 | kfree(op); | |
595 | ||
596 | if (cur == update_list) { | |
597 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
598 | btrfs_release_path(extent_root, path); | |
599 | goto out; | |
600 | } | |
601 | ||
602 | op = list_entry(cur, struct pending_extent_op, list); | |
603 | ||
604 | path->slots[0]++; | |
605 | while (path->slots[0] < btrfs_header_nritems(leaf)) { | |
606 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
607 | if (key.objectid == op->bytenr && | |
608 | key.type == BTRFS_EXTENT_REF_KEY) | |
609 | goto loop; | |
610 | path->slots[0]++; | |
611 | } | |
612 | ||
613 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
614 | btrfs_release_path(extent_root, path); | |
615 | goto search; | |
616 | ||
617 | out: | |
618 | return 0; | |
619 | } | |
620 | ||
d397712b | 621 | static noinline int insert_extents(struct btrfs_trans_handle *trans, |
f3465ca4 JB |
622 | struct btrfs_root *extent_root, |
623 | struct btrfs_path *path, | |
624 | struct list_head *insert_list, int nr) | |
625 | { | |
626 | struct btrfs_key *keys; | |
627 | u32 *data_size; | |
628 | struct pending_extent_op *op; | |
629 | struct extent_buffer *leaf; | |
630 | struct list_head *cur = insert_list->next; | |
631 | struct btrfs_fs_info *info = extent_root->fs_info; | |
632 | u64 ref_root = extent_root->root_key.objectid; | |
633 | int i = 0, last = 0, ret; | |
634 | int total = nr * 2; | |
635 | ||
636 | if (!nr) | |
637 | return 0; | |
638 | ||
639 | keys = kzalloc(total * sizeof(struct btrfs_key), GFP_NOFS); | |
640 | if (!keys) | |
641 | return -ENOMEM; | |
642 | ||
643 | data_size = kzalloc(total * sizeof(u32), GFP_NOFS); | |
644 | if (!data_size) { | |
645 | kfree(keys); | |
646 | return -ENOMEM; | |
647 | } | |
648 | ||
649 | list_for_each_entry(op, insert_list, list) { | |
650 | keys[i].objectid = op->bytenr; | |
651 | keys[i].offset = op->num_bytes; | |
652 | keys[i].type = BTRFS_EXTENT_ITEM_KEY; | |
653 | data_size[i] = sizeof(struct btrfs_extent_item); | |
654 | i++; | |
655 | ||
656 | keys[i].objectid = op->bytenr; | |
657 | keys[i].offset = op->parent; | |
658 | keys[i].type = BTRFS_EXTENT_REF_KEY; | |
659 | data_size[i] = sizeof(struct btrfs_extent_ref); | |
660 | i++; | |
661 | } | |
662 | ||
663 | op = list_entry(cur, struct pending_extent_op, list); | |
664 | i = 0; | |
665 | while (i < total) { | |
666 | int c; | |
667 | ret = btrfs_insert_some_items(trans, extent_root, path, | |
668 | keys+i, data_size+i, total-i); | |
669 | BUG_ON(ret < 0); | |
670 | ||
671 | if (last && ret > 1) | |
672 | BUG(); | |
673 | ||
674 | leaf = path->nodes[0]; | |
675 | for (c = 0; c < ret; c++) { | |
676 | int ref_first = keys[i].type == BTRFS_EXTENT_REF_KEY; | |
677 | ||
678 | /* | |
679 | * if the first item we inserted was a backref, then | |
680 | * the EXTENT_ITEM will be the odd c's, else it will | |
681 | * be the even c's | |
682 | */ | |
683 | if ((ref_first && (c % 2)) || | |
684 | (!ref_first && !(c % 2))) { | |
685 | struct btrfs_extent_item *itm; | |
686 | ||
687 | itm = btrfs_item_ptr(leaf, path->slots[0] + c, | |
688 | struct btrfs_extent_item); | |
689 | btrfs_set_extent_refs(path->nodes[0], itm, 1); | |
690 | op->del++; | |
691 | } else { | |
692 | struct btrfs_extent_ref *ref; | |
693 | ||
694 | ref = btrfs_item_ptr(leaf, path->slots[0] + c, | |
695 | struct btrfs_extent_ref); | |
696 | btrfs_set_ref_root(leaf, ref, ref_root); | |
697 | btrfs_set_ref_generation(leaf, ref, | |
698 | op->generation); | |
699 | btrfs_set_ref_objectid(leaf, ref, op->level); | |
700 | btrfs_set_ref_num_refs(leaf, ref, 1); | |
701 | op->del++; | |
702 | } | |
703 | ||
704 | /* | |
705 | * using del to see when its ok to free up the | |
706 | * pending_extent_op. In the case where we insert the | |
707 | * last item on the list in order to help do batching | |
708 | * we need to not free the extent op until we actually | |
709 | * insert the extent_item | |
710 | */ | |
711 | if (op->del == 2) { | |
712 | unlock_extent(&info->extent_ins, op->bytenr, | |
713 | op->bytenr + op->num_bytes - 1, | |
714 | GFP_NOFS); | |
715 | cur = cur->next; | |
716 | list_del_init(&op->list); | |
717 | kfree(op); | |
718 | if (cur != insert_list) | |
719 | op = list_entry(cur, | |
720 | struct pending_extent_op, | |
721 | list); | |
722 | } | |
723 | } | |
724 | btrfs_mark_buffer_dirty(leaf); | |
725 | btrfs_release_path(extent_root, path); | |
726 | ||
727 | /* | |
728 | * Ok backref's and items usually go right next to eachother, | |
729 | * but if we could only insert 1 item that means that we | |
730 | * inserted on the end of a leaf, and we have no idea what may | |
731 | * be on the next leaf so we just play it safe. In order to | |
732 | * try and help this case we insert the last thing on our | |
733 | * insert list so hopefully it will end up being the last | |
734 | * thing on the leaf and everything else will be before it, | |
735 | * which will let us insert a whole bunch of items at the same | |
736 | * time. | |
737 | */ | |
738 | if (ret == 1 && !last && (i + ret < total)) { | |
739 | /* | |
740 | * last: where we will pick up the next time around | |
741 | * i: our current key to insert, will be total - 1 | |
742 | * cur: the current op we are screwing with | |
743 | * op: duh | |
744 | */ | |
745 | last = i + ret; | |
746 | i = total - 1; | |
747 | cur = insert_list->prev; | |
748 | op = list_entry(cur, struct pending_extent_op, list); | |
749 | } else if (last) { | |
750 | /* | |
751 | * ok we successfully inserted the last item on the | |
752 | * list, lets reset everything | |
753 | * | |
754 | * i: our current key to insert, so where we left off | |
755 | * last time | |
756 | * last: done with this | |
757 | * cur: the op we are messing with | |
758 | * op: duh | |
759 | * total: since we inserted the last key, we need to | |
760 | * decrement total so we dont overflow | |
761 | */ | |
762 | i = last; | |
763 | last = 0; | |
f3465ca4 | 764 | total--; |
b4eec2ca LH |
765 | if (i < total) { |
766 | cur = insert_list->next; | |
767 | op = list_entry(cur, struct pending_extent_op, | |
768 | list); | |
769 | } | |
f3465ca4 JB |
770 | } else { |
771 | i += ret; | |
772 | } | |
773 | ||
774 | cond_resched(); | |
775 | } | |
776 | ret = 0; | |
777 | kfree(keys); | |
778 | kfree(data_size); | |
779 | return ret; | |
780 | } | |
781 | ||
d397712b | 782 | static noinline int insert_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
783 | struct btrfs_root *root, |
784 | struct btrfs_path *path, | |
785 | u64 bytenr, u64 parent, | |
786 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 787 | u64 owner_objectid) |
31840ae1 ZY |
788 | { |
789 | struct btrfs_key key; | |
790 | struct extent_buffer *leaf; | |
791 | struct btrfs_extent_ref *ref; | |
792 | u32 num_refs; | |
793 | int ret; | |
74493f7a | 794 | |
74493f7a CM |
795 | key.objectid = bytenr; |
796 | key.type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 797 | key.offset = parent; |
74493f7a | 798 | |
31840ae1 ZY |
799 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); |
800 | if (ret == 0) { | |
801 | leaf = path->nodes[0]; | |
802 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
803 | struct btrfs_extent_ref); | |
804 | btrfs_set_ref_root(leaf, ref, ref_root); | |
805 | btrfs_set_ref_generation(leaf, ref, ref_generation); | |
806 | btrfs_set_ref_objectid(leaf, ref, owner_objectid); | |
31840ae1 ZY |
807 | btrfs_set_ref_num_refs(leaf, ref, 1); |
808 | } else if (ret == -EEXIST) { | |
809 | u64 existing_owner; | |
810 | BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); | |
811 | leaf = path->nodes[0]; | |
812 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
813 | struct btrfs_extent_ref); | |
814 | if (btrfs_ref_root(leaf, ref) != ref_root || | |
815 | btrfs_ref_generation(leaf, ref) != ref_generation) { | |
816 | ret = -EIO; | |
817 | WARN_ON(1); | |
7bb86316 | 818 | goto out; |
31840ae1 ZY |
819 | } |
820 | ||
821 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
822 | BUG_ON(num_refs == 0); | |
823 | btrfs_set_ref_num_refs(leaf, ref, num_refs + 1); | |
824 | ||
825 | existing_owner = btrfs_ref_objectid(leaf, ref); | |
3bb1a1bc YZ |
826 | if (existing_owner != owner_objectid && |
827 | existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { | |
31840ae1 ZY |
828 | btrfs_set_ref_objectid(leaf, ref, |
829 | BTRFS_MULTIPLE_OBJECTIDS); | |
31840ae1 ZY |
830 | } |
831 | ret = 0; | |
832 | } else { | |
7bb86316 | 833 | goto out; |
31840ae1 | 834 | } |
7bb86316 CM |
835 | btrfs_mark_buffer_dirty(path->nodes[0]); |
836 | out: | |
837 | btrfs_release_path(root, path); | |
838 | return ret; | |
74493f7a CM |
839 | } |
840 | ||
d397712b | 841 | static noinline int remove_extent_backref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
842 | struct btrfs_root *root, |
843 | struct btrfs_path *path) | |
844 | { | |
845 | struct extent_buffer *leaf; | |
846 | struct btrfs_extent_ref *ref; | |
847 | u32 num_refs; | |
848 | int ret = 0; | |
849 | ||
850 | leaf = path->nodes[0]; | |
851 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); | |
852 | num_refs = btrfs_ref_num_refs(leaf, ref); | |
853 | BUG_ON(num_refs == 0); | |
854 | num_refs -= 1; | |
855 | if (num_refs == 0) { | |
856 | ret = btrfs_del_item(trans, root, path); | |
857 | } else { | |
858 | btrfs_set_ref_num_refs(leaf, ref, num_refs); | |
859 | btrfs_mark_buffer_dirty(leaf); | |
860 | } | |
861 | btrfs_release_path(root, path); | |
862 | return ret; | |
863 | } | |
864 | ||
4b4e25f2 | 865 | #ifdef BIO_RW_DISCARD |
15916de8 CM |
866 | static void btrfs_issue_discard(struct block_device *bdev, |
867 | u64 start, u64 len) | |
868 | { | |
15916de8 | 869 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); |
15916de8 | 870 | } |
4b4e25f2 | 871 | #endif |
15916de8 | 872 | |
1f3c79a2 LH |
873 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
874 | u64 num_bytes) | |
875 | { | |
876 | #ifdef BIO_RW_DISCARD | |
877 | int ret; | |
878 | u64 map_length = num_bytes; | |
879 | struct btrfs_multi_bio *multi = NULL; | |
880 | ||
881 | /* Tell the block device(s) that the sectors can be discarded */ | |
882 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
883 | bytenr, &map_length, &multi, 0); | |
884 | if (!ret) { | |
885 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
886 | int i; | |
887 | ||
888 | if (map_length > num_bytes) | |
889 | map_length = num_bytes; | |
890 | ||
891 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
892 | btrfs_issue_discard(stripe->dev->bdev, | |
893 | stripe->physical, | |
894 | map_length); | |
895 | } | |
896 | kfree(multi); | |
897 | } | |
898 | ||
899 | return ret; | |
900 | #else | |
901 | return 0; | |
902 | #endif | |
903 | } | |
904 | ||
d397712b | 905 | static noinline int free_extents(struct btrfs_trans_handle *trans, |
f3465ca4 JB |
906 | struct btrfs_root *extent_root, |
907 | struct list_head *del_list) | |
908 | { | |
909 | struct btrfs_fs_info *info = extent_root->fs_info; | |
910 | struct btrfs_path *path; | |
911 | struct btrfs_key key, found_key; | |
912 | struct extent_buffer *leaf; | |
913 | struct list_head *cur; | |
914 | struct pending_extent_op *op; | |
915 | struct btrfs_extent_item *ei; | |
916 | int ret, num_to_del, extent_slot = 0, found_extent = 0; | |
917 | u32 refs; | |
918 | u64 bytes_freed = 0; | |
919 | ||
920 | path = btrfs_alloc_path(); | |
921 | if (!path) | |
922 | return -ENOMEM; | |
923 | path->reada = 1; | |
924 | ||
925 | search: | |
926 | /* search for the backref for the current ref we want to delete */ | |
927 | cur = del_list->next; | |
928 | op = list_entry(cur, struct pending_extent_op, list); | |
929 | ret = lookup_extent_backref(trans, extent_root, path, op->bytenr, | |
930 | op->orig_parent, | |
931 | extent_root->root_key.objectid, | |
932 | op->orig_generation, op->level, 1); | |
933 | if (ret) { | |
d397712b CM |
934 | printk(KERN_ERR "btrfs unable to find backref byte nr %llu " |
935 | "root %llu gen %llu owner %u\n", | |
936 | (unsigned long long)op->bytenr, | |
937 | (unsigned long long)extent_root->root_key.objectid, | |
938 | (unsigned long long)op->orig_generation, op->level); | |
f3465ca4 JB |
939 | btrfs_print_leaf(extent_root, path->nodes[0]); |
940 | WARN_ON(1); | |
941 | goto out; | |
942 | } | |
943 | ||
944 | extent_slot = path->slots[0]; | |
945 | num_to_del = 1; | |
946 | found_extent = 0; | |
947 | ||
948 | /* | |
949 | * if we aren't the first item on the leaf we can move back one and see | |
950 | * if our ref is right next to our extent item | |
951 | */ | |
952 | if (likely(extent_slot)) { | |
953 | extent_slot--; | |
954 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
955 | extent_slot); | |
956 | if (found_key.objectid == op->bytenr && | |
957 | found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
958 | found_key.offset == op->num_bytes) { | |
959 | num_to_del++; | |
960 | found_extent = 1; | |
961 | } | |
962 | } | |
963 | ||
964 | /* | |
965 | * if we didn't find the extent we need to delete the backref and then | |
966 | * search for the extent item key so we can update its ref count | |
967 | */ | |
968 | if (!found_extent) { | |
969 | key.objectid = op->bytenr; | |
970 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
971 | key.offset = op->num_bytes; | |
972 | ||
973 | ret = remove_extent_backref(trans, extent_root, path); | |
974 | BUG_ON(ret); | |
975 | btrfs_release_path(extent_root, path); | |
976 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); | |
977 | BUG_ON(ret); | |
978 | extent_slot = path->slots[0]; | |
979 | } | |
980 | ||
981 | /* this is where we update the ref count for the extent */ | |
982 | leaf = path->nodes[0]; | |
983 | ei = btrfs_item_ptr(leaf, extent_slot, struct btrfs_extent_item); | |
984 | refs = btrfs_extent_refs(leaf, ei); | |
985 | BUG_ON(refs == 0); | |
986 | refs--; | |
987 | btrfs_set_extent_refs(leaf, ei, refs); | |
988 | ||
989 | btrfs_mark_buffer_dirty(leaf); | |
990 | ||
991 | /* | |
992 | * This extent needs deleting. The reason cur_slot is extent_slot + | |
993 | * num_to_del is because extent_slot points to the slot where the extent | |
994 | * is, and if the backref was not right next to the extent we will be | |
995 | * deleting at least 1 item, and will want to start searching at the | |
996 | * slot directly next to extent_slot. However if we did find the | |
997 | * backref next to the extent item them we will be deleting at least 2 | |
998 | * items and will want to start searching directly after the ref slot | |
999 | */ | |
1000 | if (!refs) { | |
1001 | struct list_head *pos, *n, *end; | |
1002 | int cur_slot = extent_slot+num_to_del; | |
1003 | u64 super_used; | |
1004 | u64 root_used; | |
1005 | ||
1006 | path->slots[0] = extent_slot; | |
1007 | bytes_freed = op->num_bytes; | |
1008 | ||
e3e469f8 JB |
1009 | mutex_lock(&info->pinned_mutex); |
1010 | ret = pin_down_bytes(trans, extent_root, op->bytenr, | |
1011 | op->num_bytes, op->level >= | |
1012 | BTRFS_FIRST_FREE_OBJECTID); | |
1013 | mutex_unlock(&info->pinned_mutex); | |
1014 | BUG_ON(ret < 0); | |
1015 | op->del = ret; | |
1016 | ||
f3465ca4 JB |
1017 | /* |
1018 | * we need to see if we can delete multiple things at once, so | |
1019 | * start looping through the list of extents we are wanting to | |
1020 | * delete and see if their extent/backref's are right next to | |
1021 | * eachother and the extents only have 1 ref | |
1022 | */ | |
1023 | for (pos = cur->next; pos != del_list; pos = pos->next) { | |
1024 | struct pending_extent_op *tmp; | |
1025 | ||
1026 | tmp = list_entry(pos, struct pending_extent_op, list); | |
1027 | ||
1028 | /* we only want to delete extent+ref at this stage */ | |
1029 | if (cur_slot >= btrfs_header_nritems(leaf) - 1) | |
1030 | break; | |
1031 | ||
1032 | btrfs_item_key_to_cpu(leaf, &found_key, cur_slot); | |
1033 | if (found_key.objectid != tmp->bytenr || | |
1034 | found_key.type != BTRFS_EXTENT_ITEM_KEY || | |
1035 | found_key.offset != tmp->num_bytes) | |
1036 | break; | |
1037 | ||
1038 | /* check to make sure this extent only has one ref */ | |
1039 | ei = btrfs_item_ptr(leaf, cur_slot, | |
1040 | struct btrfs_extent_item); | |
1041 | if (btrfs_extent_refs(leaf, ei) != 1) | |
1042 | break; | |
1043 | ||
1044 | btrfs_item_key_to_cpu(leaf, &found_key, cur_slot+1); | |
1045 | if (found_key.objectid != tmp->bytenr || | |
1046 | found_key.type != BTRFS_EXTENT_REF_KEY || | |
1047 | found_key.offset != tmp->orig_parent) | |
1048 | break; | |
1049 | ||
1050 | /* | |
1051 | * the ref is right next to the extent, we can set the | |
1052 | * ref count to 0 since we will delete them both now | |
1053 | */ | |
1054 | btrfs_set_extent_refs(leaf, ei, 0); | |
1055 | ||
1056 | /* pin down the bytes for this extent */ | |
1057 | mutex_lock(&info->pinned_mutex); | |
1058 | ret = pin_down_bytes(trans, extent_root, tmp->bytenr, | |
1059 | tmp->num_bytes, tmp->level >= | |
1060 | BTRFS_FIRST_FREE_OBJECTID); | |
1061 | mutex_unlock(&info->pinned_mutex); | |
1062 | BUG_ON(ret < 0); | |
1063 | ||
1064 | /* | |
1065 | * use the del field to tell if we need to go ahead and | |
1066 | * free up the extent when we delete the item or not. | |
1067 | */ | |
1068 | tmp->del = ret; | |
1069 | bytes_freed += tmp->num_bytes; | |
1070 | ||
1071 | num_to_del += 2; | |
1072 | cur_slot += 2; | |
1073 | } | |
1074 | end = pos; | |
1075 | ||
1076 | /* update the free space counters */ | |
75eff68e | 1077 | spin_lock(&info->delalloc_lock); |
f3465ca4 JB |
1078 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1079 | btrfs_set_super_bytes_used(&info->super_copy, | |
1080 | super_used - bytes_freed); | |
f3465ca4 JB |
1081 | |
1082 | root_used = btrfs_root_used(&extent_root->root_item); | |
1083 | btrfs_set_root_used(&extent_root->root_item, | |
1084 | root_used - bytes_freed); | |
34bf63c4 | 1085 | spin_unlock(&info->delalloc_lock); |
f3465ca4 JB |
1086 | |
1087 | /* delete the items */ | |
1088 | ret = btrfs_del_items(trans, extent_root, path, | |
1089 | path->slots[0], num_to_del); | |
1090 | BUG_ON(ret); | |
1091 | ||
1092 | /* | |
1093 | * loop through the extents we deleted and do the cleanup work | |
1094 | * on them | |
1095 | */ | |
1096 | for (pos = cur, n = pos->next; pos != end; | |
1097 | pos = n, n = pos->next) { | |
1098 | struct pending_extent_op *tmp; | |
f3465ca4 JB |
1099 | tmp = list_entry(pos, struct pending_extent_op, list); |
1100 | ||
1101 | /* | |
1102 | * remember tmp->del tells us wether or not we pinned | |
1103 | * down the extent | |
1104 | */ | |
1105 | ret = update_block_group(trans, extent_root, | |
1106 | tmp->bytenr, tmp->num_bytes, 0, | |
1107 | tmp->del); | |
1108 | BUG_ON(ret); | |
1109 | ||
f3465ca4 JB |
1110 | list_del_init(&tmp->list); |
1111 | unlock_extent(&info->extent_ins, tmp->bytenr, | |
1112 | tmp->bytenr + tmp->num_bytes - 1, | |
1113 | GFP_NOFS); | |
1114 | kfree(tmp); | |
1115 | } | |
1116 | } else if (refs && found_extent) { | |
1117 | /* | |
1118 | * the ref and extent were right next to eachother, but the | |
1119 | * extent still has a ref, so just free the backref and keep | |
1120 | * going | |
1121 | */ | |
1122 | ret = remove_extent_backref(trans, extent_root, path); | |
1123 | BUG_ON(ret); | |
1124 | ||
1125 | list_del_init(&op->list); | |
1126 | unlock_extent(&info->extent_ins, op->bytenr, | |
1127 | op->bytenr + op->num_bytes - 1, GFP_NOFS); | |
1128 | kfree(op); | |
1129 | } else { | |
1130 | /* | |
1131 | * the extent has multiple refs and the backref we were looking | |
1132 | * for was not right next to it, so just unlock and go next, | |
1133 | * we're good to go | |
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 | } | |
1140 | ||
1141 | btrfs_release_path(extent_root, path); | |
1142 | if (!list_empty(del_list)) | |
1143 | goto search; | |
1144 | ||
1145 | out: | |
1146 | btrfs_free_path(path); | |
1147 | return ret; | |
1148 | } | |
1149 | ||
31840ae1 ZY |
1150 | static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
1151 | struct btrfs_root *root, u64 bytenr, | |
1152 | u64 orig_parent, u64 parent, | |
1153 | u64 orig_root, u64 ref_root, | |
1154 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 1155 | u64 owner_objectid) |
31840ae1 ZY |
1156 | { |
1157 | int ret; | |
1158 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
1159 | struct btrfs_path *path; | |
1160 | ||
1161 | if (root == root->fs_info->extent_root) { | |
1162 | struct pending_extent_op *extent_op; | |
1163 | u64 num_bytes; | |
1164 | ||
1165 | BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL); | |
1166 | num_bytes = btrfs_level_size(root, (int)owner_objectid); | |
25179201 | 1167 | mutex_lock(&root->fs_info->extent_ins_mutex); |
31840ae1 | 1168 | if (test_range_bit(&root->fs_info->extent_ins, bytenr, |
25179201 | 1169 | bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) { |
31840ae1 ZY |
1170 | u64 priv; |
1171 | ret = get_state_private(&root->fs_info->extent_ins, | |
1172 | bytenr, &priv); | |
1173 | BUG_ON(ret); | |
1174 | extent_op = (struct pending_extent_op *) | |
1175 | (unsigned long)priv; | |
1176 | BUG_ON(extent_op->parent != orig_parent); | |
1177 | BUG_ON(extent_op->generation != orig_generation); | |
25179201 | 1178 | |
31840ae1 ZY |
1179 | extent_op->parent = parent; |
1180 | extent_op->generation = ref_generation; | |
1181 | } else { | |
1182 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
1183 | BUG_ON(!extent_op); | |
1184 | ||
1185 | extent_op->type = PENDING_BACKREF_UPDATE; | |
1186 | extent_op->bytenr = bytenr; | |
1187 | extent_op->num_bytes = num_bytes; | |
1188 | extent_op->parent = parent; | |
1189 | extent_op->orig_parent = orig_parent; | |
1190 | extent_op->generation = ref_generation; | |
1191 | extent_op->orig_generation = orig_generation; | |
1192 | extent_op->level = (int)owner_objectid; | |
f3465ca4 JB |
1193 | INIT_LIST_HEAD(&extent_op->list); |
1194 | extent_op->del = 0; | |
31840ae1 ZY |
1195 | |
1196 | set_extent_bits(&root->fs_info->extent_ins, | |
1197 | bytenr, bytenr + num_bytes - 1, | |
25179201 | 1198 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
1199 | set_state_private(&root->fs_info->extent_ins, |
1200 | bytenr, (unsigned long)extent_op); | |
1201 | } | |
25179201 | 1202 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
31840ae1 ZY |
1203 | return 0; |
1204 | } | |
1205 | ||
1206 | path = btrfs_alloc_path(); | |
1207 | if (!path) | |
1208 | return -ENOMEM; | |
1209 | ret = lookup_extent_backref(trans, extent_root, path, | |
1210 | bytenr, orig_parent, orig_root, | |
3bb1a1bc | 1211 | orig_generation, owner_objectid, 1); |
31840ae1 ZY |
1212 | if (ret) |
1213 | goto out; | |
1214 | ret = remove_extent_backref(trans, extent_root, path); | |
1215 | if (ret) | |
1216 | goto out; | |
1217 | ret = insert_extent_backref(trans, extent_root, path, bytenr, | |
1218 | parent, ref_root, ref_generation, | |
3bb1a1bc | 1219 | owner_objectid); |
31840ae1 | 1220 | BUG_ON(ret); |
87ef2bb4 CM |
1221 | finish_current_insert(trans, extent_root, 0); |
1222 | del_pending_extents(trans, extent_root, 0); | |
31840ae1 ZY |
1223 | out: |
1224 | btrfs_free_path(path); | |
1225 | return ret; | |
1226 | } | |
1227 | ||
1228 | int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, | |
1229 | struct btrfs_root *root, u64 bytenr, | |
1230 | u64 orig_parent, u64 parent, | |
1231 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 1232 | u64 owner_objectid) |
31840ae1 ZY |
1233 | { |
1234 | int ret; | |
1235 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && | |
1236 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
1237 | return 0; | |
31840ae1 ZY |
1238 | ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent, |
1239 | parent, ref_root, ref_root, | |
1240 | ref_generation, ref_generation, | |
3bb1a1bc | 1241 | owner_objectid); |
31840ae1 ZY |
1242 | return ret; |
1243 | } | |
1244 | ||
925baedd | 1245 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
1246 | struct btrfs_root *root, u64 bytenr, |
1247 | u64 orig_parent, u64 parent, | |
1248 | u64 orig_root, u64 ref_root, | |
1249 | u64 orig_generation, u64 ref_generation, | |
3bb1a1bc | 1250 | u64 owner_objectid) |
02217ed2 | 1251 | { |
5caf2a00 | 1252 | struct btrfs_path *path; |
02217ed2 | 1253 | int ret; |
e2fa7227 | 1254 | struct btrfs_key key; |
5f39d397 | 1255 | struct extent_buffer *l; |
234b63a0 | 1256 | struct btrfs_extent_item *item; |
cf27e1ee | 1257 | u32 refs; |
037e6390 | 1258 | |
5caf2a00 | 1259 | path = btrfs_alloc_path(); |
54aa1f4d CM |
1260 | if (!path) |
1261 | return -ENOMEM; | |
26b8003f | 1262 | |
3c12ac72 | 1263 | path->reada = 1; |
db94535d | 1264 | key.objectid = bytenr; |
31840ae1 ZY |
1265 | key.type = BTRFS_EXTENT_ITEM_KEY; |
1266 | key.offset = (u64)-1; | |
1267 | ||
5caf2a00 | 1268 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 1269 | 0, 1); |
54aa1f4d CM |
1270 | if (ret < 0) |
1271 | return ret; | |
31840ae1 ZY |
1272 | BUG_ON(ret == 0 || path->slots[0] == 0); |
1273 | ||
1274 | path->slots[0]--; | |
5f39d397 | 1275 | l = path->nodes[0]; |
31840ae1 ZY |
1276 | |
1277 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
771ed689 CM |
1278 | if (key.objectid != bytenr) { |
1279 | btrfs_print_leaf(root->fs_info->extent_root, path->nodes[0]); | |
d397712b CM |
1280 | printk(KERN_ERR "btrfs wanted %llu found %llu\n", |
1281 | (unsigned long long)bytenr, | |
1282 | (unsigned long long)key.objectid); | |
771ed689 CM |
1283 | BUG(); |
1284 | } | |
31840ae1 ZY |
1285 | BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); |
1286 | ||
5caf2a00 | 1287 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 CM |
1288 | refs = btrfs_extent_refs(l, item); |
1289 | btrfs_set_extent_refs(l, item, refs + 1); | |
5caf2a00 | 1290 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 1291 | |
5caf2a00 | 1292 | btrfs_release_path(root->fs_info->extent_root, path); |
7bb86316 | 1293 | |
3c12ac72 | 1294 | path->reada = 1; |
31840ae1 ZY |
1295 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
1296 | path, bytenr, parent, | |
1297 | ref_root, ref_generation, | |
3bb1a1bc | 1298 | owner_objectid); |
7bb86316 | 1299 | BUG_ON(ret); |
87ef2bb4 CM |
1300 | finish_current_insert(trans, root->fs_info->extent_root, 0); |
1301 | del_pending_extents(trans, root->fs_info->extent_root, 0); | |
74493f7a CM |
1302 | |
1303 | btrfs_free_path(path); | |
02217ed2 CM |
1304 | return 0; |
1305 | } | |
1306 | ||
925baedd | 1307 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
1308 | struct btrfs_root *root, |
1309 | u64 bytenr, u64 num_bytes, u64 parent, | |
1310 | u64 ref_root, u64 ref_generation, | |
3bb1a1bc | 1311 | u64 owner_objectid) |
925baedd CM |
1312 | { |
1313 | int ret; | |
31840ae1 ZY |
1314 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && |
1315 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
1316 | return 0; | |
31840ae1 ZY |
1317 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent, |
1318 | 0, ref_root, 0, ref_generation, | |
3bb1a1bc | 1319 | owner_objectid); |
925baedd CM |
1320 | return ret; |
1321 | } | |
1322 | ||
e9d0b13b CM |
1323 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
1324 | struct btrfs_root *root) | |
1325 | { | |
87ef2bb4 CM |
1326 | finish_current_insert(trans, root->fs_info->extent_root, 1); |
1327 | del_pending_extents(trans, root->fs_info->extent_root, 1); | |
e9d0b13b CM |
1328 | return 0; |
1329 | } | |
1330 | ||
31840ae1 ZY |
1331 | int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans, |
1332 | struct btrfs_root *root, u64 bytenr, | |
1333 | u64 num_bytes, u32 *refs) | |
a28ec197 | 1334 | { |
5caf2a00 | 1335 | struct btrfs_path *path; |
a28ec197 | 1336 | int ret; |
e2fa7227 | 1337 | struct btrfs_key key; |
5f39d397 | 1338 | struct extent_buffer *l; |
234b63a0 | 1339 | struct btrfs_extent_item *item; |
5caf2a00 | 1340 | |
db94535d | 1341 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 1342 | path = btrfs_alloc_path(); |
3c12ac72 | 1343 | path->reada = 1; |
db94535d CM |
1344 | key.objectid = bytenr; |
1345 | key.offset = num_bytes; | |
62e2749e | 1346 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
5caf2a00 | 1347 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 1348 | 0, 0); |
54aa1f4d CM |
1349 | if (ret < 0) |
1350 | goto out; | |
5f39d397 CM |
1351 | if (ret != 0) { |
1352 | btrfs_print_leaf(root, path->nodes[0]); | |
d397712b CM |
1353 | printk(KERN_INFO "btrfs failed to find block number %llu\n", |
1354 | (unsigned long long)bytenr); | |
a28ec197 | 1355 | BUG(); |
5f39d397 CM |
1356 | } |
1357 | l = path->nodes[0]; | |
5caf2a00 | 1358 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 | 1359 | *refs = btrfs_extent_refs(l, item); |
54aa1f4d | 1360 | out: |
5caf2a00 | 1361 | btrfs_free_path(path); |
a28ec197 CM |
1362 | return 0; |
1363 | } | |
1364 | ||
80ff3856 | 1365 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
17d217fe | 1366 | struct btrfs_root *root, u64 objectid, u64 bytenr) |
be20aa9d CM |
1367 | { |
1368 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
1369 | struct btrfs_path *path; | |
f321e491 YZ |
1370 | struct extent_buffer *leaf; |
1371 | struct btrfs_extent_ref *ref_item; | |
1372 | struct btrfs_key key; | |
1373 | struct btrfs_key found_key; | |
80ff3856 YZ |
1374 | u64 ref_root; |
1375 | u64 last_snapshot; | |
be20aa9d CM |
1376 | u32 nritems; |
1377 | int ret; | |
925baedd | 1378 | |
be20aa9d | 1379 | key.objectid = bytenr; |
31840ae1 | 1380 | key.offset = (u64)-1; |
f321e491 | 1381 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 1382 | |
f321e491 | 1383 | path = btrfs_alloc_path(); |
be20aa9d CM |
1384 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
1385 | if (ret < 0) | |
1386 | goto out; | |
1387 | BUG_ON(ret == 0); | |
80ff3856 YZ |
1388 | |
1389 | ret = -ENOENT; | |
1390 | if (path->slots[0] == 0) | |
31840ae1 | 1391 | goto out; |
be20aa9d | 1392 | |
31840ae1 | 1393 | path->slots[0]--; |
f321e491 YZ |
1394 | leaf = path->nodes[0]; |
1395 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
be20aa9d CM |
1396 | |
1397 | if (found_key.objectid != bytenr || | |
80ff3856 | 1398 | found_key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 1399 | goto out; |
f321e491 | 1400 | |
80ff3856 | 1401 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
be20aa9d | 1402 | while (1) { |
f321e491 YZ |
1403 | leaf = path->nodes[0]; |
1404 | nritems = btrfs_header_nritems(leaf); | |
be20aa9d CM |
1405 | if (path->slots[0] >= nritems) { |
1406 | ret = btrfs_next_leaf(extent_root, path); | |
f321e491 YZ |
1407 | if (ret < 0) |
1408 | goto out; | |
be20aa9d CM |
1409 | if (ret == 0) |
1410 | continue; | |
1411 | break; | |
1412 | } | |
f321e491 | 1413 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
be20aa9d CM |
1414 | if (found_key.objectid != bytenr) |
1415 | break; | |
bd09835d | 1416 | |
be20aa9d CM |
1417 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
1418 | path->slots[0]++; | |
1419 | continue; | |
1420 | } | |
1421 | ||
f321e491 | 1422 | ref_item = btrfs_item_ptr(leaf, path->slots[0], |
be20aa9d | 1423 | struct btrfs_extent_ref); |
80ff3856 | 1424 | ref_root = btrfs_ref_root(leaf, ref_item); |
17d217fe YZ |
1425 | if ((ref_root != root->root_key.objectid && |
1426 | ref_root != BTRFS_TREE_LOG_OBJECTID) || | |
1427 | objectid != btrfs_ref_objectid(leaf, ref_item)) { | |
80ff3856 | 1428 | ret = 1; |
f321e491 | 1429 | goto out; |
80ff3856 YZ |
1430 | } |
1431 | if (btrfs_ref_generation(leaf, ref_item) <= last_snapshot) { | |
f321e491 YZ |
1432 | ret = 1; |
1433 | goto out; | |
1434 | } | |
80ff3856 YZ |
1435 | |
1436 | path->slots[0]++; | |
f321e491 YZ |
1437 | } |
1438 | ret = 0; | |
be20aa9d | 1439 | out: |
80ff3856 | 1440 | btrfs_free_path(path); |
f321e491 | 1441 | return ret; |
be20aa9d | 1442 | } |
c5739bba | 1443 | |
31840ae1 ZY |
1444 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
1445 | struct extent_buffer *buf, u32 nr_extents) | |
02217ed2 | 1446 | { |
5f39d397 | 1447 | struct btrfs_key key; |
6407bf6d | 1448 | struct btrfs_file_extent_item *fi; |
e4657689 ZY |
1449 | u64 root_gen; |
1450 | u32 nritems; | |
02217ed2 | 1451 | int i; |
db94535d | 1452 | int level; |
31840ae1 | 1453 | int ret = 0; |
e4657689 | 1454 | int shared = 0; |
a28ec197 | 1455 | |
3768f368 | 1456 | if (!root->ref_cows) |
a28ec197 | 1457 | return 0; |
5f39d397 | 1458 | |
e4657689 ZY |
1459 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
1460 | shared = 0; | |
1461 | root_gen = root->root_key.offset; | |
1462 | } else { | |
1463 | shared = 1; | |
1464 | root_gen = trans->transid - 1; | |
1465 | } | |
1466 | ||
db94535d | 1467 | level = btrfs_header_level(buf); |
5f39d397 | 1468 | nritems = btrfs_header_nritems(buf); |
4a096752 | 1469 | |
31840ae1 | 1470 | if (level == 0) { |
31153d81 YZ |
1471 | struct btrfs_leaf_ref *ref; |
1472 | struct btrfs_extent_info *info; | |
1473 | ||
31840ae1 | 1474 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
31153d81 | 1475 | if (!ref) { |
31840ae1 | 1476 | ret = -ENOMEM; |
31153d81 YZ |
1477 | goto out; |
1478 | } | |
1479 | ||
e4657689 | 1480 | ref->root_gen = root_gen; |
31153d81 YZ |
1481 | ref->bytenr = buf->start; |
1482 | ref->owner = btrfs_header_owner(buf); | |
1483 | ref->generation = btrfs_header_generation(buf); | |
31840ae1 | 1484 | ref->nritems = nr_extents; |
31153d81 | 1485 | info = ref->extents; |
bcc63abb | 1486 | |
31840ae1 | 1487 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
31153d81 YZ |
1488 | u64 disk_bytenr; |
1489 | btrfs_item_key_to_cpu(buf, &key, i); | |
1490 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1491 | continue; | |
1492 | fi = btrfs_item_ptr(buf, i, | |
1493 | struct btrfs_file_extent_item); | |
1494 | if (btrfs_file_extent_type(buf, fi) == | |
1495 | BTRFS_FILE_EXTENT_INLINE) | |
1496 | continue; | |
1497 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1498 | if (disk_bytenr == 0) | |
1499 | continue; | |
1500 | ||
1501 | info->bytenr = disk_bytenr; | |
1502 | info->num_bytes = | |
1503 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
1504 | info->objectid = key.objectid; | |
1505 | info->offset = key.offset; | |
1506 | info++; | |
1507 | } | |
1508 | ||
e4657689 | 1509 | ret = btrfs_add_leaf_ref(root, ref, shared); |
5b84e8d6 YZ |
1510 | if (ret == -EEXIST && shared) { |
1511 | struct btrfs_leaf_ref *old; | |
1512 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); | |
1513 | BUG_ON(!old); | |
1514 | btrfs_remove_leaf_ref(root, old); | |
1515 | btrfs_free_leaf_ref(root, old); | |
1516 | ret = btrfs_add_leaf_ref(root, ref, shared); | |
1517 | } | |
31153d81 | 1518 | WARN_ON(ret); |
bcc63abb | 1519 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
1520 | } |
1521 | out: | |
31840ae1 ZY |
1522 | return ret; |
1523 | } | |
1524 | ||
b7a9f29f CM |
1525 | /* when a block goes through cow, we update the reference counts of |
1526 | * everything that block points to. The internal pointers of the block | |
1527 | * can be in just about any order, and it is likely to have clusters of | |
1528 | * things that are close together and clusters of things that are not. | |
1529 | * | |
1530 | * To help reduce the seeks that come with updating all of these reference | |
1531 | * counts, sort them by byte number before actual updates are done. | |
1532 | * | |
1533 | * struct refsort is used to match byte number to slot in the btree block. | |
1534 | * we sort based on the byte number and then use the slot to actually | |
1535 | * find the item. | |
1536 | */ | |
1537 | struct refsort { | |
1538 | u64 bytenr; | |
1539 | u32 slot; | |
1540 | }; | |
1541 | ||
1542 | /* | |
1543 | * for passing into sort() | |
1544 | */ | |
1545 | static int refsort_cmp(const void *a_void, const void *b_void) | |
1546 | { | |
1547 | const struct refsort *a = a_void; | |
1548 | const struct refsort *b = b_void; | |
1549 | ||
1550 | if (a->bytenr < b->bytenr) | |
1551 | return -1; | |
1552 | if (a->bytenr > b->bytenr) | |
1553 | return 1; | |
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | ||
1558 | noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans, | |
1559 | struct btrfs_root *root, | |
1560 | struct extent_buffer *orig_buf, | |
1561 | struct extent_buffer *buf, u32 *nr_extents) | |
31840ae1 ZY |
1562 | { |
1563 | u64 bytenr; | |
1564 | u64 ref_root; | |
1565 | u64 orig_root; | |
1566 | u64 ref_generation; | |
1567 | u64 orig_generation; | |
b7a9f29f | 1568 | struct refsort *sorted; |
31840ae1 ZY |
1569 | u32 nritems; |
1570 | u32 nr_file_extents = 0; | |
1571 | struct btrfs_key key; | |
1572 | struct btrfs_file_extent_item *fi; | |
1573 | int i; | |
1574 | int level; | |
1575 | int ret = 0; | |
1576 | int faili = 0; | |
b7a9f29f CM |
1577 | int refi = 0; |
1578 | int slot; | |
31840ae1 | 1579 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
3bb1a1bc | 1580 | u64, u64, u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
1581 | |
1582 | ref_root = btrfs_header_owner(buf); | |
1583 | ref_generation = btrfs_header_generation(buf); | |
1584 | orig_root = btrfs_header_owner(orig_buf); | |
1585 | orig_generation = btrfs_header_generation(orig_buf); | |
1586 | ||
1587 | nritems = btrfs_header_nritems(buf); | |
1588 | level = btrfs_header_level(buf); | |
1589 | ||
b7a9f29f CM |
1590 | sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS); |
1591 | BUG_ON(!sorted); | |
1592 | ||
31840ae1 ZY |
1593 | if (root->ref_cows) { |
1594 | process_func = __btrfs_inc_extent_ref; | |
1595 | } else { | |
1596 | if (level == 0 && | |
1597 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1598 | goto out; | |
1599 | if (level != 0 && | |
1600 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1601 | goto out; | |
1602 | process_func = __btrfs_update_extent_ref; | |
1603 | } | |
1604 | ||
b7a9f29f CM |
1605 | /* |
1606 | * we make two passes through the items. In the first pass we | |
1607 | * only record the byte number and slot. Then we sort based on | |
1608 | * byte number and do the actual work based on the sorted results | |
1609 | */ | |
31840ae1 ZY |
1610 | for (i = 0; i < nritems; i++) { |
1611 | cond_resched(); | |
db94535d | 1612 | if (level == 0) { |
5f39d397 CM |
1613 | btrfs_item_key_to_cpu(buf, &key, i); |
1614 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 1615 | continue; |
5f39d397 | 1616 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 1617 | struct btrfs_file_extent_item); |
5f39d397 | 1618 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
1619 | BTRFS_FILE_EXTENT_INLINE) |
1620 | continue; | |
31840ae1 ZY |
1621 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
1622 | if (bytenr == 0) | |
54aa1f4d | 1623 | continue; |
31840ae1 ZY |
1624 | |
1625 | nr_file_extents++; | |
b7a9f29f CM |
1626 | sorted[refi].bytenr = bytenr; |
1627 | sorted[refi].slot = i; | |
1628 | refi++; | |
1629 | } else { | |
1630 | bytenr = btrfs_node_blockptr(buf, i); | |
1631 | sorted[refi].bytenr = bytenr; | |
1632 | sorted[refi].slot = i; | |
1633 | refi++; | |
1634 | } | |
1635 | } | |
1636 | /* | |
1637 | * if refi == 0, we didn't actually put anything into the sorted | |
1638 | * array and we're done | |
1639 | */ | |
1640 | if (refi == 0) | |
1641 | goto out; | |
1642 | ||
1643 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); | |
1644 | ||
1645 | for (i = 0; i < refi; i++) { | |
1646 | cond_resched(); | |
1647 | slot = sorted[i].slot; | |
1648 | bytenr = sorted[i].bytenr; | |
1649 | ||
1650 | if (level == 0) { | |
1651 | btrfs_item_key_to_cpu(buf, &key, slot); | |
31840ae1 | 1652 | |
31840ae1 ZY |
1653 | ret = process_func(trans, root, bytenr, |
1654 | orig_buf->start, buf->start, | |
1655 | orig_root, ref_root, | |
1656 | orig_generation, ref_generation, | |
3bb1a1bc | 1657 | key.objectid); |
31840ae1 ZY |
1658 | |
1659 | if (ret) { | |
b7a9f29f | 1660 | faili = slot; |
31840ae1 ZY |
1661 | WARN_ON(1); |
1662 | goto fail; | |
1663 | } | |
54aa1f4d | 1664 | } else { |
31840ae1 ZY |
1665 | ret = process_func(trans, root, bytenr, |
1666 | orig_buf->start, buf->start, | |
1667 | orig_root, ref_root, | |
1668 | orig_generation, ref_generation, | |
3bb1a1bc | 1669 | level - 1); |
31840ae1 | 1670 | if (ret) { |
b7a9f29f | 1671 | faili = slot; |
31840ae1 ZY |
1672 | WARN_ON(1); |
1673 | goto fail; | |
1674 | } | |
54aa1f4d CM |
1675 | } |
1676 | } | |
31840ae1 | 1677 | out: |
b7a9f29f | 1678 | kfree(sorted); |
31840ae1 ZY |
1679 | if (nr_extents) { |
1680 | if (level == 0) | |
1681 | *nr_extents = nr_file_extents; | |
1682 | else | |
1683 | *nr_extents = nritems; | |
1684 | } | |
1685 | return 0; | |
1686 | fail: | |
b7a9f29f | 1687 | kfree(sorted); |
31840ae1 | 1688 | WARN_ON(1); |
54aa1f4d | 1689 | return ret; |
02217ed2 CM |
1690 | } |
1691 | ||
31840ae1 ZY |
1692 | int btrfs_update_ref(struct btrfs_trans_handle *trans, |
1693 | struct btrfs_root *root, struct extent_buffer *orig_buf, | |
1694 | struct extent_buffer *buf, int start_slot, int nr) | |
1695 | ||
1696 | { | |
1697 | u64 bytenr; | |
1698 | u64 ref_root; | |
1699 | u64 orig_root; | |
1700 | u64 ref_generation; | |
1701 | u64 orig_generation; | |
1702 | struct btrfs_key key; | |
1703 | struct btrfs_file_extent_item *fi; | |
1704 | int i; | |
1705 | int ret; | |
1706 | int slot; | |
1707 | int level; | |
1708 | ||
1709 | BUG_ON(start_slot < 0); | |
1710 | BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); | |
1711 | ||
1712 | ref_root = btrfs_header_owner(buf); | |
1713 | ref_generation = btrfs_header_generation(buf); | |
1714 | orig_root = btrfs_header_owner(orig_buf); | |
1715 | orig_generation = btrfs_header_generation(orig_buf); | |
1716 | level = btrfs_header_level(buf); | |
1717 | ||
1718 | if (!root->ref_cows) { | |
1719 | if (level == 0 && | |
1720 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
1721 | return 0; | |
1722 | if (level != 0 && | |
1723 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | for (i = 0, slot = start_slot; i < nr; i++, slot++) { | |
1728 | cond_resched(); | |
1729 | if (level == 0) { | |
1730 | btrfs_item_key_to_cpu(buf, &key, slot); | |
1731 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1732 | continue; | |
1733 | fi = btrfs_item_ptr(buf, slot, | |
1734 | struct btrfs_file_extent_item); | |
1735 | if (btrfs_file_extent_type(buf, fi) == | |
1736 | BTRFS_FILE_EXTENT_INLINE) | |
1737 | continue; | |
1738 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1739 | if (bytenr == 0) | |
1740 | continue; | |
31840ae1 ZY |
1741 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
1742 | orig_buf->start, buf->start, | |
1743 | orig_root, ref_root, | |
1744 | orig_generation, ref_generation, | |
3bb1a1bc | 1745 | key.objectid); |
31840ae1 ZY |
1746 | if (ret) |
1747 | goto fail; | |
1748 | } else { | |
1749 | bytenr = btrfs_node_blockptr(buf, slot); | |
31840ae1 ZY |
1750 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
1751 | orig_buf->start, buf->start, | |
1752 | orig_root, ref_root, | |
1753 | orig_generation, ref_generation, | |
3bb1a1bc | 1754 | level - 1); |
31840ae1 ZY |
1755 | if (ret) |
1756 | goto fail; | |
1757 | } | |
1758 | } | |
1759 | return 0; | |
1760 | fail: | |
1761 | WARN_ON(1); | |
1762 | return -1; | |
1763 | } | |
1764 | ||
9078a3e1 CM |
1765 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
1766 | struct btrfs_root *root, | |
1767 | struct btrfs_path *path, | |
1768 | struct btrfs_block_group_cache *cache) | |
1769 | { | |
1770 | int ret; | |
1771 | int pending_ret; | |
1772 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
5f39d397 CM |
1773 | unsigned long bi; |
1774 | struct extent_buffer *leaf; | |
9078a3e1 | 1775 | |
9078a3e1 | 1776 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
1777 | if (ret < 0) |
1778 | goto fail; | |
9078a3e1 | 1779 | BUG_ON(ret); |
5f39d397 CM |
1780 | |
1781 | leaf = path->nodes[0]; | |
1782 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1783 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
1784 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 1785 | btrfs_release_path(extent_root, path); |
54aa1f4d | 1786 | fail: |
87ef2bb4 CM |
1787 | finish_current_insert(trans, extent_root, 0); |
1788 | pending_ret = del_pending_extents(trans, extent_root, 0); | |
9078a3e1 CM |
1789 | if (ret) |
1790 | return ret; | |
1791 | if (pending_ret) | |
1792 | return pending_ret; | |
1793 | return 0; | |
1794 | ||
1795 | } | |
1796 | ||
96b5179d CM |
1797 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
1798 | struct btrfs_root *root) | |
9078a3e1 | 1799 | { |
0f9dd46c JB |
1800 | struct btrfs_block_group_cache *cache, *entry; |
1801 | struct rb_node *n; | |
9078a3e1 CM |
1802 | int err = 0; |
1803 | int werr = 0; | |
9078a3e1 | 1804 | struct btrfs_path *path; |
96b5179d | 1805 | u64 last = 0; |
9078a3e1 CM |
1806 | |
1807 | path = btrfs_alloc_path(); | |
1808 | if (!path) | |
1809 | return -ENOMEM; | |
1810 | ||
d397712b | 1811 | while (1) { |
0f9dd46c JB |
1812 | cache = NULL; |
1813 | spin_lock(&root->fs_info->block_group_cache_lock); | |
1814 | for (n = rb_first(&root->fs_info->block_group_cache_tree); | |
1815 | n; n = rb_next(n)) { | |
1816 | entry = rb_entry(n, struct btrfs_block_group_cache, | |
1817 | cache_node); | |
1818 | if (entry->dirty) { | |
1819 | cache = entry; | |
1820 | break; | |
1821 | } | |
1822 | } | |
1823 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
54aa1f4d | 1824 | |
0f9dd46c | 1825 | if (!cache) |
96b5179d | 1826 | break; |
0f9dd46c | 1827 | |
e8569813 | 1828 | cache->dirty = 0; |
0f9dd46c JB |
1829 | last += cache->key.offset; |
1830 | ||
96b5179d CM |
1831 | err = write_one_cache_group(trans, root, |
1832 | path, cache); | |
1833 | /* | |
1834 | * if we fail to write the cache group, we want | |
1835 | * to keep it marked dirty in hopes that a later | |
1836 | * write will work | |
1837 | */ | |
1838 | if (err) { | |
1839 | werr = err; | |
1840 | continue; | |
9078a3e1 CM |
1841 | } |
1842 | } | |
1843 | btrfs_free_path(path); | |
1844 | return werr; | |
1845 | } | |
1846 | ||
d2fb3437 YZ |
1847 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
1848 | { | |
1849 | struct btrfs_block_group_cache *block_group; | |
1850 | int readonly = 0; | |
1851 | ||
1852 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
1853 | if (!block_group || block_group->ro) | |
1854 | readonly = 1; | |
1855 | if (block_group) | |
1856 | put_block_group(block_group); | |
1857 | return readonly; | |
1858 | } | |
1859 | ||
593060d7 CM |
1860 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1861 | u64 total_bytes, u64 bytes_used, | |
1862 | struct btrfs_space_info **space_info) | |
1863 | { | |
1864 | struct btrfs_space_info *found; | |
1865 | ||
1866 | found = __find_space_info(info, flags); | |
1867 | if (found) { | |
25179201 | 1868 | spin_lock(&found->lock); |
593060d7 CM |
1869 | found->total_bytes += total_bytes; |
1870 | found->bytes_used += bytes_used; | |
8f18cf13 | 1871 | found->full = 0; |
25179201 | 1872 | spin_unlock(&found->lock); |
593060d7 CM |
1873 | *space_info = found; |
1874 | return 0; | |
1875 | } | |
c146afad | 1876 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
1877 | if (!found) |
1878 | return -ENOMEM; | |
1879 | ||
1880 | list_add(&found->list, &info->space_info); | |
0f9dd46c | 1881 | INIT_LIST_HEAD(&found->block_groups); |
80eb234a | 1882 | init_rwsem(&found->groups_sem); |
0f9dd46c | 1883 | spin_lock_init(&found->lock); |
593060d7 CM |
1884 | found->flags = flags; |
1885 | found->total_bytes = total_bytes; | |
1886 | found->bytes_used = bytes_used; | |
1887 | found->bytes_pinned = 0; | |
e8569813 | 1888 | found->bytes_reserved = 0; |
c146afad | 1889 | found->bytes_readonly = 0; |
593060d7 | 1890 | found->full = 0; |
0ef3e66b | 1891 | found->force_alloc = 0; |
593060d7 CM |
1892 | *space_info = found; |
1893 | return 0; | |
1894 | } | |
1895 | ||
8790d502 CM |
1896 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1897 | { | |
1898 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1899 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1900 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1901 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1902 | if (extra_flags) { |
1903 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1904 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1905 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1906 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1907 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1908 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1909 | } | |
1910 | } | |
593060d7 | 1911 | |
c146afad YZ |
1912 | static void set_block_group_readonly(struct btrfs_block_group_cache *cache) |
1913 | { | |
1914 | spin_lock(&cache->space_info->lock); | |
1915 | spin_lock(&cache->lock); | |
1916 | if (!cache->ro) { | |
1917 | cache->space_info->bytes_readonly += cache->key.offset - | |
1918 | btrfs_block_group_used(&cache->item); | |
1919 | cache->ro = 1; | |
1920 | } | |
1921 | spin_unlock(&cache->lock); | |
1922 | spin_unlock(&cache->space_info->lock); | |
1923 | } | |
1924 | ||
2b82032c | 1925 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1926 | { |
2b82032c | 1927 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
a061fc8d CM |
1928 | |
1929 | if (num_devices == 1) | |
1930 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1931 | if (num_devices < 4) | |
1932 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1933 | ||
ec44a35c CM |
1934 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1935 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1936 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1937 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1938 | } |
ec44a35c CM |
1939 | |
1940 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1941 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1942 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1943 | } |
ec44a35c CM |
1944 | |
1945 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1946 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1947 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1948 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1949 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1950 | return flags; | |
1951 | } | |
1952 | ||
6324fbf3 CM |
1953 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1954 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 1955 | u64 flags, int force) |
6324fbf3 CM |
1956 | { |
1957 | struct btrfs_space_info *space_info; | |
1958 | u64 thresh; | |
c146afad YZ |
1959 | int ret = 0; |
1960 | ||
1961 | mutex_lock(&extent_root->fs_info->chunk_mutex); | |
6324fbf3 | 1962 | |
2b82032c | 1963 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1964 | |
6324fbf3 | 1965 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1966 | if (!space_info) { |
1967 | ret = update_space_info(extent_root->fs_info, flags, | |
1968 | 0, 0, &space_info); | |
1969 | BUG_ON(ret); | |
1970 | } | |
6324fbf3 CM |
1971 | BUG_ON(!space_info); |
1972 | ||
25179201 | 1973 | spin_lock(&space_info->lock); |
0ef3e66b CM |
1974 | if (space_info->force_alloc) { |
1975 | force = 1; | |
1976 | space_info->force_alloc = 0; | |
1977 | } | |
25179201 JB |
1978 | if (space_info->full) { |
1979 | spin_unlock(&space_info->lock); | |
925baedd | 1980 | goto out; |
25179201 | 1981 | } |
6324fbf3 | 1982 | |
c146afad YZ |
1983 | thresh = space_info->total_bytes - space_info->bytes_readonly; |
1984 | thresh = div_factor(thresh, 6); | |
0ef3e66b | 1985 | if (!force && |
e8569813 | 1986 | (space_info->bytes_used + space_info->bytes_pinned + |
25179201 JB |
1987 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
1988 | spin_unlock(&space_info->lock); | |
925baedd | 1989 | goto out; |
25179201 | 1990 | } |
25179201 JB |
1991 | spin_unlock(&space_info->lock); |
1992 | ||
2b82032c | 1993 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
d397712b | 1994 | if (ret) |
6324fbf3 | 1995 | space_info->full = 1; |
a74a4b97 | 1996 | out: |
c146afad | 1997 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 1998 | return ret; |
6324fbf3 CM |
1999 | } |
2000 | ||
9078a3e1 CM |
2001 | static int update_block_group(struct btrfs_trans_handle *trans, |
2002 | struct btrfs_root *root, | |
db94535d | 2003 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 2004 | int mark_free) |
9078a3e1 CM |
2005 | { |
2006 | struct btrfs_block_group_cache *cache; | |
2007 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 2008 | u64 total = num_bytes; |
9078a3e1 | 2009 | u64 old_val; |
db94535d | 2010 | u64 byte_in_group; |
3e1ad54f | 2011 | |
d397712b | 2012 | while (total) { |
db94535d | 2013 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 2014 | if (!cache) |
9078a3e1 | 2015 | return -1; |
db94535d CM |
2016 | byte_in_group = bytenr - cache->key.objectid; |
2017 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 2018 | |
25179201 | 2019 | spin_lock(&cache->space_info->lock); |
c286ac48 | 2020 | spin_lock(&cache->lock); |
0f9dd46c | 2021 | cache->dirty = 1; |
9078a3e1 | 2022 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 2023 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 2024 | if (alloc) { |
db94535d | 2025 | old_val += num_bytes; |
6324fbf3 | 2026 | cache->space_info->bytes_used += num_bytes; |
a512bbf8 | 2027 | if (cache->ro) |
c146afad | 2028 | cache->space_info->bytes_readonly -= num_bytes; |
c286ac48 CM |
2029 | btrfs_set_block_group_used(&cache->item, old_val); |
2030 | spin_unlock(&cache->lock); | |
25179201 | 2031 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 2032 | } else { |
db94535d | 2033 | old_val -= num_bytes; |
6324fbf3 | 2034 | cache->space_info->bytes_used -= num_bytes; |
c146afad YZ |
2035 | if (cache->ro) |
2036 | cache->space_info->bytes_readonly += num_bytes; | |
c286ac48 CM |
2037 | btrfs_set_block_group_used(&cache->item, old_val); |
2038 | spin_unlock(&cache->lock); | |
25179201 | 2039 | spin_unlock(&cache->space_info->lock); |
f510cfec | 2040 | if (mark_free) { |
0f9dd46c | 2041 | int ret; |
1f3c79a2 LH |
2042 | |
2043 | ret = btrfs_discard_extent(root, bytenr, | |
2044 | num_bytes); | |
2045 | WARN_ON(ret); | |
2046 | ||
0f9dd46c JB |
2047 | ret = btrfs_add_free_space(cache, bytenr, |
2048 | num_bytes); | |
d2fb3437 | 2049 | WARN_ON(ret); |
e37c9e69 | 2050 | } |
cd1bc465 | 2051 | } |
d2fb3437 | 2052 | put_block_group(cache); |
db94535d CM |
2053 | total -= num_bytes; |
2054 | bytenr += num_bytes; | |
9078a3e1 CM |
2055 | } |
2056 | return 0; | |
2057 | } | |
6324fbf3 | 2058 | |
a061fc8d CM |
2059 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
2060 | { | |
0f9dd46c | 2061 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 2062 | u64 bytenr; |
0f9dd46c JB |
2063 | |
2064 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
2065 | if (!cache) | |
a061fc8d | 2066 | return 0; |
0f9dd46c | 2067 | |
d2fb3437 YZ |
2068 | bytenr = cache->key.objectid; |
2069 | put_block_group(cache); | |
2070 | ||
2071 | return bytenr; | |
a061fc8d CM |
2072 | } |
2073 | ||
e02119d5 | 2074 | int btrfs_update_pinned_extents(struct btrfs_root *root, |
324ae4df Y |
2075 | u64 bytenr, u64 num, int pin) |
2076 | { | |
2077 | u64 len; | |
2078 | struct btrfs_block_group_cache *cache; | |
2079 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2080 | ||
25179201 | 2081 | WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex)); |
324ae4df Y |
2082 | if (pin) { |
2083 | set_extent_dirty(&fs_info->pinned_extents, | |
2084 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2085 | } else { | |
2086 | clear_extent_dirty(&fs_info->pinned_extents, | |
2087 | bytenr, bytenr + num - 1, GFP_NOFS); | |
2088 | } | |
2089 | while (num > 0) { | |
2090 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
e8569813 ZY |
2091 | BUG_ON(!cache); |
2092 | len = min(num, cache->key.offset - | |
2093 | (bytenr - cache->key.objectid)); | |
324ae4df | 2094 | if (pin) { |
25179201 | 2095 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2096 | spin_lock(&cache->lock); |
2097 | cache->pinned += len; | |
2098 | cache->space_info->bytes_pinned += len; | |
2099 | spin_unlock(&cache->lock); | |
25179201 | 2100 | spin_unlock(&cache->space_info->lock); |
324ae4df Y |
2101 | fs_info->total_pinned += len; |
2102 | } else { | |
25179201 | 2103 | spin_lock(&cache->space_info->lock); |
e8569813 ZY |
2104 | spin_lock(&cache->lock); |
2105 | cache->pinned -= len; | |
2106 | cache->space_info->bytes_pinned -= len; | |
2107 | spin_unlock(&cache->lock); | |
25179201 | 2108 | spin_unlock(&cache->space_info->lock); |
324ae4df | 2109 | fs_info->total_pinned -= len; |
07103a3c JB |
2110 | if (cache->cached) |
2111 | btrfs_add_free_space(cache, bytenr, len); | |
324ae4df | 2112 | } |
d2fb3437 | 2113 | put_block_group(cache); |
324ae4df Y |
2114 | bytenr += len; |
2115 | num -= len; | |
2116 | } | |
2117 | return 0; | |
2118 | } | |
9078a3e1 | 2119 | |
e8569813 ZY |
2120 | static int update_reserved_extents(struct btrfs_root *root, |
2121 | u64 bytenr, u64 num, int reserve) | |
2122 | { | |
2123 | u64 len; | |
2124 | struct btrfs_block_group_cache *cache; | |
2125 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2126 | ||
e8569813 ZY |
2127 | while (num > 0) { |
2128 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
2129 | BUG_ON(!cache); | |
2130 | len = min(num, cache->key.offset - | |
2131 | (bytenr - cache->key.objectid)); | |
25179201 JB |
2132 | |
2133 | spin_lock(&cache->space_info->lock); | |
2134 | spin_lock(&cache->lock); | |
e8569813 | 2135 | if (reserve) { |
e8569813 ZY |
2136 | cache->reserved += len; |
2137 | cache->space_info->bytes_reserved += len; | |
e8569813 | 2138 | } else { |
e8569813 ZY |
2139 | cache->reserved -= len; |
2140 | cache->space_info->bytes_reserved -= len; | |
e8569813 | 2141 | } |
25179201 JB |
2142 | spin_unlock(&cache->lock); |
2143 | spin_unlock(&cache->space_info->lock); | |
d2fb3437 | 2144 | put_block_group(cache); |
e8569813 ZY |
2145 | bytenr += len; |
2146 | num -= len; | |
2147 | } | |
2148 | return 0; | |
2149 | } | |
2150 | ||
d1310b2e | 2151 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 2152 | { |
ccd467d6 | 2153 | u64 last = 0; |
1a5bc167 CM |
2154 | u64 start; |
2155 | u64 end; | |
d1310b2e | 2156 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 2157 | int ret; |
ccd467d6 | 2158 | |
25179201 | 2159 | mutex_lock(&root->fs_info->pinned_mutex); |
d397712b | 2160 | while (1) { |
1a5bc167 CM |
2161 | ret = find_first_extent_bit(pinned_extents, last, |
2162 | &start, &end, EXTENT_DIRTY); | |
2163 | if (ret) | |
ccd467d6 | 2164 | break; |
1a5bc167 CM |
2165 | set_extent_dirty(copy, start, end, GFP_NOFS); |
2166 | last = end + 1; | |
ccd467d6 | 2167 | } |
25179201 | 2168 | mutex_unlock(&root->fs_info->pinned_mutex); |
ccd467d6 CM |
2169 | return 0; |
2170 | } | |
2171 | ||
2172 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
2173 | struct btrfs_root *root, | |
d1310b2e | 2174 | struct extent_io_tree *unpin) |
a28ec197 | 2175 | { |
1a5bc167 CM |
2176 | u64 start; |
2177 | u64 end; | |
a28ec197 | 2178 | int ret; |
a28ec197 | 2179 | |
25179201 | 2180 | mutex_lock(&root->fs_info->pinned_mutex); |
d397712b | 2181 | while (1) { |
1a5bc167 CM |
2182 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
2183 | EXTENT_DIRTY); | |
2184 | if (ret) | |
a28ec197 | 2185 | break; |
1f3c79a2 LH |
2186 | |
2187 | ret = btrfs_discard_extent(root, start, end + 1 - start); | |
2188 | ||
e02119d5 | 2189 | btrfs_update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 | 2190 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
1f3c79a2 | 2191 | |
c286ac48 | 2192 | if (need_resched()) { |
25179201 | 2193 | mutex_unlock(&root->fs_info->pinned_mutex); |
c286ac48 | 2194 | cond_resched(); |
25179201 | 2195 | mutex_lock(&root->fs_info->pinned_mutex); |
c286ac48 | 2196 | } |
a28ec197 | 2197 | } |
25179201 | 2198 | mutex_unlock(&root->fs_info->pinned_mutex); |
1f3c79a2 | 2199 | return ret; |
a28ec197 CM |
2200 | } |
2201 | ||
98ed5174 | 2202 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
87ef2bb4 | 2203 | struct btrfs_root *extent_root, int all) |
037e6390 | 2204 | { |
7bb86316 CM |
2205 | u64 start; |
2206 | u64 end; | |
31840ae1 | 2207 | u64 priv; |
25179201 | 2208 | u64 search = 0; |
f3465ca4 | 2209 | u64 skipped = 0; |
7bb86316 CM |
2210 | struct btrfs_fs_info *info = extent_root->fs_info; |
2211 | struct btrfs_path *path; | |
f3465ca4 JB |
2212 | struct pending_extent_op *extent_op, *tmp; |
2213 | struct list_head insert_list, update_list; | |
037e6390 | 2214 | int ret; |
f3465ca4 | 2215 | int num_inserts = 0, max_inserts; |
037e6390 | 2216 | |
7bb86316 | 2217 | path = btrfs_alloc_path(); |
f3465ca4 JB |
2218 | INIT_LIST_HEAD(&insert_list); |
2219 | INIT_LIST_HEAD(&update_list); | |
037e6390 | 2220 | |
f3465ca4 JB |
2221 | max_inserts = extent_root->leafsize / |
2222 | (2 * sizeof(struct btrfs_key) + 2 * sizeof(struct btrfs_item) + | |
2223 | sizeof(struct btrfs_extent_ref) + | |
2224 | sizeof(struct btrfs_extent_item)); | |
2225 | again: | |
2226 | mutex_lock(&info->extent_ins_mutex); | |
2227 | while (1) { | |
25179201 JB |
2228 | ret = find_first_extent_bit(&info->extent_ins, search, &start, |
2229 | &end, EXTENT_WRITEBACK); | |
2230 | if (ret) { | |
5a7be515 YZ |
2231 | if (skipped && all && !num_inserts && |
2232 | list_empty(&update_list)) { | |
f3465ca4 | 2233 | skipped = 0; |
b4eec2ca | 2234 | search = 0; |
25179201 JB |
2235 | continue; |
2236 | } | |
f3465ca4 | 2237 | mutex_unlock(&info->extent_ins_mutex); |
26b8003f | 2238 | break; |
25179201 JB |
2239 | } |
2240 | ||
2241 | ret = try_lock_extent(&info->extent_ins, start, end, GFP_NOFS); | |
2242 | if (!ret) { | |
f3465ca4 | 2243 | skipped = 1; |
87ef2bb4 | 2244 | search = end + 1; |
f3465ca4 JB |
2245 | if (need_resched()) { |
2246 | mutex_unlock(&info->extent_ins_mutex); | |
2247 | cond_resched(); | |
2248 | mutex_lock(&info->extent_ins_mutex); | |
2249 | } | |
25179201 JB |
2250 | continue; |
2251 | } | |
26b8003f | 2252 | |
31840ae1 ZY |
2253 | ret = get_state_private(&info->extent_ins, start, &priv); |
2254 | BUG_ON(ret); | |
f3465ca4 | 2255 | extent_op = (struct pending_extent_op *)(unsigned long) priv; |
25179201 | 2256 | |
31840ae1 | 2257 | if (extent_op->type == PENDING_EXTENT_INSERT) { |
f3465ca4 JB |
2258 | num_inserts++; |
2259 | list_add_tail(&extent_op->list, &insert_list); | |
2260 | search = end + 1; | |
2261 | if (num_inserts == max_inserts) { | |
2262 | mutex_unlock(&info->extent_ins_mutex); | |
2263 | break; | |
2264 | } | |
2265 | } else if (extent_op->type == PENDING_BACKREF_UPDATE) { | |
2266 | list_add_tail(&extent_op->list, &update_list); | |
2267 | search = end + 1; | |
2268 | } else { | |
2269 | BUG(); | |
2270 | } | |
2271 | } | |
c286ac48 | 2272 | |
f3465ca4 | 2273 | /* |
b4eec2ca | 2274 | * process the update list, clear the writeback bit for it, and if |
f3465ca4 JB |
2275 | * somebody marked this thing for deletion then just unlock it and be |
2276 | * done, the free_extents will handle it | |
2277 | */ | |
2278 | mutex_lock(&info->extent_ins_mutex); | |
2279 | list_for_each_entry_safe(extent_op, tmp, &update_list, list) { | |
2280 | clear_extent_bits(&info->extent_ins, extent_op->bytenr, | |
2281 | extent_op->bytenr + extent_op->num_bytes - 1, | |
2282 | EXTENT_WRITEBACK, GFP_NOFS); | |
2283 | if (extent_op->del) { | |
2284 | list_del_init(&extent_op->list); | |
2285 | unlock_extent(&info->extent_ins, extent_op->bytenr, | |
2286 | extent_op->bytenr + extent_op->num_bytes | |
2287 | - 1, GFP_NOFS); | |
2288 | kfree(extent_op); | |
2289 | } | |
2290 | } | |
2291 | mutex_unlock(&info->extent_ins_mutex); | |
c286ac48 | 2292 | |
f3465ca4 JB |
2293 | /* |
2294 | * still have things left on the update list, go ahead an update | |
2295 | * everything | |
2296 | */ | |
2297 | if (!list_empty(&update_list)) { | |
2298 | ret = update_backrefs(trans, extent_root, path, &update_list); | |
2299 | BUG_ON(ret); | |
2300 | } | |
c286ac48 | 2301 | |
f3465ca4 JB |
2302 | /* |
2303 | * if no inserts need to be done, but we skipped some extents and we | |
2304 | * need to make sure everything is cleaned then reset everything and | |
2305 | * go back to the beginning | |
2306 | */ | |
2307 | if (!num_inserts && all && skipped) { | |
2308 | search = 0; | |
2309 | skipped = 0; | |
2310 | INIT_LIST_HEAD(&update_list); | |
2311 | INIT_LIST_HEAD(&insert_list); | |
2312 | goto again; | |
2313 | } else if (!num_inserts) { | |
2314 | goto out; | |
2315 | } | |
31840ae1 | 2316 | |
f3465ca4 JB |
2317 | /* |
2318 | * process the insert extents list. Again if we are deleting this | |
2319 | * extent, then just unlock it, pin down the bytes if need be, and be | |
2320 | * done with it. Saves us from having to actually insert the extent | |
2321 | * into the tree and then subsequently come along and delete it | |
2322 | */ | |
2323 | mutex_lock(&info->extent_ins_mutex); | |
2324 | list_for_each_entry_safe(extent_op, tmp, &insert_list, list) { | |
2325 | clear_extent_bits(&info->extent_ins, extent_op->bytenr, | |
2326 | extent_op->bytenr + extent_op->num_bytes - 1, | |
2327 | EXTENT_WRITEBACK, GFP_NOFS); | |
2328 | if (extent_op->del) { | |
34bf63c4 | 2329 | u64 used; |
f3465ca4 JB |
2330 | list_del_init(&extent_op->list); |
2331 | unlock_extent(&info->extent_ins, extent_op->bytenr, | |
2332 | extent_op->bytenr + extent_op->num_bytes | |
2333 | - 1, GFP_NOFS); | |
2334 | ||
2335 | mutex_lock(&extent_root->fs_info->pinned_mutex); | |
2336 | ret = pin_down_bytes(trans, extent_root, | |
2337 | extent_op->bytenr, | |
2338 | extent_op->num_bytes, 0); | |
2339 | mutex_unlock(&extent_root->fs_info->pinned_mutex); | |
2340 | ||
34bf63c4 YZ |
2341 | spin_lock(&info->delalloc_lock); |
2342 | used = btrfs_super_bytes_used(&info->super_copy); | |
2343 | btrfs_set_super_bytes_used(&info->super_copy, | |
2344 | used - extent_op->num_bytes); | |
2345 | used = btrfs_root_used(&extent_root->root_item); | |
2346 | btrfs_set_root_used(&extent_root->root_item, | |
2347 | used - extent_op->num_bytes); | |
2348 | spin_unlock(&info->delalloc_lock); | |
2349 | ||
f3465ca4 JB |
2350 | ret = update_block_group(trans, extent_root, |
2351 | extent_op->bytenr, | |
2352 | extent_op->num_bytes, | |
2353 | 0, ret > 0); | |
2354 | BUG_ON(ret); | |
2355 | kfree(extent_op); | |
2356 | num_inserts--; | |
d8d5f3e1 | 2357 | } |
f3465ca4 JB |
2358 | } |
2359 | mutex_unlock(&info->extent_ins_mutex); | |
31840ae1 | 2360 | |
f3465ca4 JB |
2361 | ret = insert_extents(trans, extent_root, path, &insert_list, |
2362 | num_inserts); | |
2363 | BUG_ON(ret); | |
2364 | ||
2365 | /* | |
2366 | * if we broke out of the loop in order to insert stuff because we hit | |
2367 | * the maximum number of inserts at a time we can handle, then loop | |
2368 | * back and pick up where we left off | |
2369 | */ | |
2370 | if (num_inserts == max_inserts) { | |
2371 | INIT_LIST_HEAD(&insert_list); | |
2372 | INIT_LIST_HEAD(&update_list); | |
2373 | num_inserts = 0; | |
2374 | goto again; | |
2375 | } | |
2376 | ||
2377 | /* | |
2378 | * again, if we need to make absolutely sure there are no more pending | |
2379 | * extent operations left and we know that we skipped some, go back to | |
2380 | * the beginning and do it all again | |
2381 | */ | |
2382 | if (all && skipped) { | |
2383 | INIT_LIST_HEAD(&insert_list); | |
2384 | INIT_LIST_HEAD(&update_list); | |
2385 | search = 0; | |
2386 | skipped = 0; | |
2387 | num_inserts = 0; | |
2388 | goto again; | |
037e6390 | 2389 | } |
f3465ca4 | 2390 | out: |
7bb86316 | 2391 | btrfs_free_path(path); |
037e6390 CM |
2392 | return 0; |
2393 | } | |
2394 | ||
31840ae1 ZY |
2395 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
2396 | struct btrfs_root *root, | |
2397 | u64 bytenr, u64 num_bytes, int is_data) | |
e20d96d6 | 2398 | { |
1a5bc167 | 2399 | int err = 0; |
31840ae1 | 2400 | struct extent_buffer *buf; |
8ef97622 | 2401 | |
31840ae1 ZY |
2402 | if (is_data) |
2403 | goto pinit; | |
2404 | ||
2405 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); | |
2406 | if (!buf) | |
2407 | goto pinit; | |
2408 | ||
2409 | /* we can reuse a block if it hasn't been written | |
2410 | * and it is from this transaction. We can't | |
2411 | * reuse anything from the tree log root because | |
2412 | * it has tiny sub-transactions. | |
2413 | */ | |
2414 | if (btrfs_buffer_uptodate(buf, 0) && | |
2415 | btrfs_try_tree_lock(buf)) { | |
2416 | u64 header_owner = btrfs_header_owner(buf); | |
2417 | u64 header_transid = btrfs_header_generation(buf); | |
2418 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && | |
1a40e23b | 2419 | header_owner != BTRFS_TREE_RELOC_OBJECTID && |
31840ae1 ZY |
2420 | header_transid == trans->transid && |
2421 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
2422 | clean_tree_block(NULL, root, buf); | |
2423 | btrfs_tree_unlock(buf); | |
5f39d397 | 2424 | free_extent_buffer(buf); |
31840ae1 | 2425 | return 1; |
8ef97622 | 2426 | } |
31840ae1 | 2427 | btrfs_tree_unlock(buf); |
f4b9aa8d | 2428 | } |
31840ae1 ZY |
2429 | free_extent_buffer(buf); |
2430 | pinit: | |
2431 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); | |
2432 | ||
be744175 | 2433 | BUG_ON(err < 0); |
e20d96d6 CM |
2434 | return 0; |
2435 | } | |
2436 | ||
fec577fb | 2437 | /* |
a28ec197 | 2438 | * remove an extent from the root, returns 0 on success |
fec577fb | 2439 | */ |
31840ae1 ZY |
2440 | static int __free_extent(struct btrfs_trans_handle *trans, |
2441 | struct btrfs_root *root, | |
2442 | u64 bytenr, u64 num_bytes, u64 parent, | |
7bb86316 | 2443 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 2444 | u64 owner_objectid, int pin, int mark_free) |
a28ec197 | 2445 | { |
5caf2a00 | 2446 | struct btrfs_path *path; |
e2fa7227 | 2447 | struct btrfs_key key; |
1261ec42 CM |
2448 | struct btrfs_fs_info *info = root->fs_info; |
2449 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 2450 | struct extent_buffer *leaf; |
a28ec197 | 2451 | int ret; |
952fccac CM |
2452 | int extent_slot = 0; |
2453 | int found_extent = 0; | |
2454 | int num_to_del = 1; | |
234b63a0 | 2455 | struct btrfs_extent_item *ei; |
cf27e1ee | 2456 | u32 refs; |
037e6390 | 2457 | |
db94535d | 2458 | key.objectid = bytenr; |
62e2749e | 2459 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 2460 | key.offset = num_bytes; |
5caf2a00 | 2461 | path = btrfs_alloc_path(); |
54aa1f4d CM |
2462 | if (!path) |
2463 | return -ENOMEM; | |
5f26f772 | 2464 | |
3c12ac72 | 2465 | path->reada = 1; |
3bb1a1bc YZ |
2466 | ret = lookup_extent_backref(trans, extent_root, path, |
2467 | bytenr, parent, root_objectid, | |
2468 | ref_generation, owner_objectid, 1); | |
7bb86316 | 2469 | if (ret == 0) { |
952fccac CM |
2470 | struct btrfs_key found_key; |
2471 | extent_slot = path->slots[0]; | |
d397712b | 2472 | while (extent_slot > 0) { |
952fccac CM |
2473 | extent_slot--; |
2474 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2475 | extent_slot); | |
2476 | if (found_key.objectid != bytenr) | |
2477 | break; | |
2478 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
2479 | found_key.offset == num_bytes) { | |
2480 | found_extent = 1; | |
2481 | break; | |
2482 | } | |
2483 | if (path->slots[0] - extent_slot > 5) | |
2484 | break; | |
2485 | } | |
31840ae1 ZY |
2486 | if (!found_extent) { |
2487 | ret = remove_extent_backref(trans, extent_root, path); | |
2488 | BUG_ON(ret); | |
2489 | btrfs_release_path(extent_root, path); | |
2490 | ret = btrfs_search_slot(trans, extent_root, | |
2491 | &key, path, -1, 1); | |
f3465ca4 JB |
2492 | if (ret) { |
2493 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
2494 | ", was looking for %llu\n", ret, |
2495 | (unsigned long long)bytenr); | |
f3465ca4 JB |
2496 | btrfs_print_leaf(extent_root, path->nodes[0]); |
2497 | } | |
31840ae1 ZY |
2498 | BUG_ON(ret); |
2499 | extent_slot = path->slots[0]; | |
2500 | } | |
7bb86316 CM |
2501 | } else { |
2502 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
2503 | WARN_ON(1); | |
d397712b CM |
2504 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
2505 | "root %llu gen %llu owner %llu\n", | |
2506 | (unsigned long long)bytenr, | |
2507 | (unsigned long long)root_objectid, | |
2508 | (unsigned long long)ref_generation, | |
2509 | (unsigned long long)owner_objectid); | |
7bb86316 | 2510 | } |
5f39d397 CM |
2511 | |
2512 | leaf = path->nodes[0]; | |
952fccac | 2513 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 2514 | struct btrfs_extent_item); |
5f39d397 CM |
2515 | refs = btrfs_extent_refs(leaf, ei); |
2516 | BUG_ON(refs == 0); | |
2517 | refs -= 1; | |
2518 | btrfs_set_extent_refs(leaf, ei, refs); | |
952fccac | 2519 | |
5f39d397 CM |
2520 | btrfs_mark_buffer_dirty(leaf); |
2521 | ||
952fccac | 2522 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
31840ae1 ZY |
2523 | struct btrfs_extent_ref *ref; |
2524 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
2525 | struct btrfs_extent_ref); | |
2526 | BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1); | |
952fccac CM |
2527 | /* if the back ref and the extent are next to each other |
2528 | * they get deleted below in one shot | |
2529 | */ | |
2530 | path->slots[0] = extent_slot; | |
2531 | num_to_del = 2; | |
2532 | } else if (found_extent) { | |
2533 | /* otherwise delete the extent back ref */ | |
31840ae1 | 2534 | ret = remove_extent_backref(trans, extent_root, path); |
952fccac CM |
2535 | BUG_ON(ret); |
2536 | /* if refs are 0, we need to setup the path for deletion */ | |
2537 | if (refs == 0) { | |
2538 | btrfs_release_path(extent_root, path); | |
2539 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
2540 | -1, 1); | |
952fccac CM |
2541 | BUG_ON(ret); |
2542 | } | |
2543 | } | |
2544 | ||
cf27e1ee | 2545 | if (refs == 0) { |
db94535d CM |
2546 | u64 super_used; |
2547 | u64 root_used; | |
78fae27e CM |
2548 | |
2549 | if (pin) { | |
25179201 | 2550 | mutex_lock(&root->fs_info->pinned_mutex); |
31840ae1 ZY |
2551 | ret = pin_down_bytes(trans, root, bytenr, num_bytes, |
2552 | owner_objectid >= BTRFS_FIRST_FREE_OBJECTID); | |
25179201 | 2553 | mutex_unlock(&root->fs_info->pinned_mutex); |
c549228f Y |
2554 | if (ret > 0) |
2555 | mark_free = 1; | |
2556 | BUG_ON(ret < 0); | |
78fae27e | 2557 | } |
58176a96 | 2558 | /* block accounting for super block */ |
75eff68e | 2559 | spin_lock(&info->delalloc_lock); |
db94535d CM |
2560 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2561 | btrfs_set_super_bytes_used(&info->super_copy, | |
2562 | super_used - num_bytes); | |
58176a96 JB |
2563 | |
2564 | /* block accounting for root item */ | |
db94535d | 2565 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 2566 | btrfs_set_root_used(&root->root_item, |
db94535d | 2567 | root_used - num_bytes); |
34bf63c4 | 2568 | spin_unlock(&info->delalloc_lock); |
952fccac CM |
2569 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
2570 | num_to_del); | |
31840ae1 | 2571 | BUG_ON(ret); |
25179201 | 2572 | btrfs_release_path(extent_root, path); |
21af804c | 2573 | |
459931ec CM |
2574 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
2575 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); | |
2576 | BUG_ON(ret); | |
2577 | } | |
2578 | ||
dcbdd4dc CM |
2579 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
2580 | mark_free); | |
2581 | BUG_ON(ret); | |
a28ec197 | 2582 | } |
5caf2a00 | 2583 | btrfs_free_path(path); |
87ef2bb4 | 2584 | finish_current_insert(trans, extent_root, 0); |
a28ec197 CM |
2585 | return ret; |
2586 | } | |
2587 | ||
a28ec197 CM |
2588 | /* |
2589 | * find all the blocks marked as pending in the radix tree and remove | |
2590 | * them from the extent map | |
2591 | */ | |
d397712b CM |
2592 | static int del_pending_extents(struct btrfs_trans_handle *trans, |
2593 | struct btrfs_root *extent_root, int all) | |
a28ec197 CM |
2594 | { |
2595 | int ret; | |
e20d96d6 | 2596 | int err = 0; |
1a5bc167 CM |
2597 | u64 start; |
2598 | u64 end; | |
31840ae1 | 2599 | u64 priv; |
25179201 | 2600 | u64 search = 0; |
f3465ca4 | 2601 | int nr = 0, skipped = 0; |
d1310b2e | 2602 | struct extent_io_tree *pending_del; |
31840ae1 ZY |
2603 | struct extent_io_tree *extent_ins; |
2604 | struct pending_extent_op *extent_op; | |
25179201 | 2605 | struct btrfs_fs_info *info = extent_root->fs_info; |
f3465ca4 | 2606 | struct list_head delete_list; |
8ef97622 | 2607 | |
f3465ca4 | 2608 | INIT_LIST_HEAD(&delete_list); |
31840ae1 | 2609 | extent_ins = &extent_root->fs_info->extent_ins; |
1a5bc167 | 2610 | pending_del = &extent_root->fs_info->pending_del; |
a28ec197 | 2611 | |
f3465ca4 JB |
2612 | again: |
2613 | mutex_lock(&info->extent_ins_mutex); | |
d397712b | 2614 | while (1) { |
25179201 JB |
2615 | ret = find_first_extent_bit(pending_del, search, &start, &end, |
2616 | EXTENT_WRITEBACK); | |
2617 | if (ret) { | |
f3465ca4 | 2618 | if (all && skipped && !nr) { |
25179201 | 2619 | search = 0; |
5a7be515 | 2620 | skipped = 0; |
25179201 JB |
2621 | continue; |
2622 | } | |
f3465ca4 | 2623 | mutex_unlock(&info->extent_ins_mutex); |
a28ec197 | 2624 | break; |
25179201 JB |
2625 | } |
2626 | ||
2627 | ret = try_lock_extent(extent_ins, start, end, GFP_NOFS); | |
2628 | if (!ret) { | |
2629 | search = end+1; | |
f3465ca4 JB |
2630 | skipped = 1; |
2631 | ||
2632 | if (need_resched()) { | |
2633 | mutex_unlock(&info->extent_ins_mutex); | |
2634 | cond_resched(); | |
2635 | mutex_lock(&info->extent_ins_mutex); | |
2636 | } | |
2637 | ||
25179201 JB |
2638 | continue; |
2639 | } | |
2640 | BUG_ON(ret < 0); | |
31840ae1 ZY |
2641 | |
2642 | ret = get_state_private(pending_del, start, &priv); | |
2643 | BUG_ON(ret); | |
2644 | extent_op = (struct pending_extent_op *)(unsigned long)priv; | |
2645 | ||
25179201 | 2646 | clear_extent_bits(pending_del, start, end, EXTENT_WRITEBACK, |
1a5bc167 | 2647 | GFP_NOFS); |
31840ae1 | 2648 | if (!test_range_bit(extent_ins, start, end, |
25179201 | 2649 | EXTENT_WRITEBACK, 0)) { |
f3465ca4 JB |
2650 | list_add_tail(&extent_op->list, &delete_list); |
2651 | nr++; | |
c286ac48 | 2652 | } else { |
31840ae1 | 2653 | kfree(extent_op); |
25179201 JB |
2654 | |
2655 | ret = get_state_private(&info->extent_ins, start, | |
2656 | &priv); | |
31840ae1 ZY |
2657 | BUG_ON(ret); |
2658 | extent_op = (struct pending_extent_op *) | |
25179201 JB |
2659 | (unsigned long)priv; |
2660 | ||
2661 | clear_extent_bits(&info->extent_ins, start, end, | |
2662 | EXTENT_WRITEBACK, GFP_NOFS); | |
31840ae1 | 2663 | |
f3465ca4 JB |
2664 | if (extent_op->type == PENDING_BACKREF_UPDATE) { |
2665 | list_add_tail(&extent_op->list, &delete_list); | |
2666 | search = end + 1; | |
2667 | nr++; | |
2668 | continue; | |
2669 | } | |
31840ae1 | 2670 | |
25179201 JB |
2671 | mutex_lock(&extent_root->fs_info->pinned_mutex); |
2672 | ret = pin_down_bytes(trans, extent_root, start, | |
2673 | end + 1 - start, 0); | |
2674 | mutex_unlock(&extent_root->fs_info->pinned_mutex); | |
2675 | ||
31840ae1 | 2676 | ret = update_block_group(trans, extent_root, start, |
25179201 JB |
2677 | end + 1 - start, 0, ret > 0); |
2678 | ||
f3465ca4 | 2679 | unlock_extent(extent_ins, start, end, GFP_NOFS); |
31840ae1 ZY |
2680 | BUG_ON(ret); |
2681 | kfree(extent_op); | |
c286ac48 | 2682 | } |
1a5bc167 CM |
2683 | if (ret) |
2684 | err = ret; | |
c286ac48 | 2685 | |
f3465ca4 JB |
2686 | search = end + 1; |
2687 | ||
2688 | if (need_resched()) { | |
2689 | mutex_unlock(&info->extent_ins_mutex); | |
2690 | cond_resched(); | |
2691 | mutex_lock(&info->extent_ins_mutex); | |
2692 | } | |
2693 | } | |
2694 | ||
2695 | if (nr) { | |
2696 | ret = free_extents(trans, extent_root, &delete_list); | |
2697 | BUG_ON(ret); | |
2698 | } | |
2699 | ||
2700 | if (all && skipped) { | |
2701 | INIT_LIST_HEAD(&delete_list); | |
2702 | search = 0; | |
2703 | nr = 0; | |
2704 | goto again; | |
fec577fb | 2705 | } |
f3465ca4 | 2706 | |
e20d96d6 | 2707 | return err; |
fec577fb CM |
2708 | } |
2709 | ||
2710 | /* | |
2711 | * remove an extent from the root, returns 0 on success | |
2712 | */ | |
925baedd | 2713 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2714 | struct btrfs_root *root, |
2715 | u64 bytenr, u64 num_bytes, u64 parent, | |
2716 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2717 | u64 owner_objectid, int pin) |
fec577fb | 2718 | { |
9f5fae2f | 2719 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
2720 | int pending_ret; |
2721 | int ret; | |
a28ec197 | 2722 | |
db94535d | 2723 | WARN_ON(num_bytes < root->sectorsize); |
fec577fb | 2724 | if (root == extent_root) { |
f3465ca4 JB |
2725 | struct pending_extent_op *extent_op = NULL; |
2726 | ||
2727 | mutex_lock(&root->fs_info->extent_ins_mutex); | |
2728 | if (test_range_bit(&root->fs_info->extent_ins, bytenr, | |
2729 | bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) { | |
2730 | u64 priv; | |
2731 | ret = get_state_private(&root->fs_info->extent_ins, | |
2732 | bytenr, &priv); | |
2733 | BUG_ON(ret); | |
2734 | extent_op = (struct pending_extent_op *) | |
2735 | (unsigned long)priv; | |
2736 | ||
2737 | extent_op->del = 1; | |
2738 | if (extent_op->type == PENDING_EXTENT_INSERT) { | |
2739 | mutex_unlock(&root->fs_info->extent_ins_mutex); | |
2740 | return 0; | |
2741 | } | |
2742 | } | |
2743 | ||
2744 | if (extent_op) { | |
2745 | ref_generation = extent_op->orig_generation; | |
2746 | parent = extent_op->orig_parent; | |
2747 | } | |
31840ae1 ZY |
2748 | |
2749 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2750 | BUG_ON(!extent_op); | |
2751 | ||
2752 | extent_op->type = PENDING_EXTENT_DELETE; | |
2753 | extent_op->bytenr = bytenr; | |
2754 | extent_op->num_bytes = num_bytes; | |
2755 | extent_op->parent = parent; | |
2756 | extent_op->orig_parent = parent; | |
2757 | extent_op->generation = ref_generation; | |
2758 | extent_op->orig_generation = ref_generation; | |
2759 | extent_op->level = (int)owner_objectid; | |
f3465ca4 JB |
2760 | INIT_LIST_HEAD(&extent_op->list); |
2761 | extent_op->del = 0; | |
31840ae1 ZY |
2762 | |
2763 | set_extent_bits(&root->fs_info->pending_del, | |
2764 | bytenr, bytenr + num_bytes - 1, | |
25179201 | 2765 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
2766 | set_state_private(&root->fs_info->pending_del, |
2767 | bytenr, (unsigned long)extent_op); | |
25179201 | 2768 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
fec577fb CM |
2769 | return 0; |
2770 | } | |
4bef0848 | 2771 | /* if metadata always pin */ |
d00aff00 CM |
2772 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
2773 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { | |
7237f183 YZ |
2774 | mutex_lock(&root->fs_info->pinned_mutex); |
2775 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); | |
2776 | mutex_unlock(&root->fs_info->pinned_mutex); | |
e8569813 | 2777 | update_reserved_extents(root, bytenr, num_bytes, 0); |
d00aff00 CM |
2778 | return 0; |
2779 | } | |
4bef0848 | 2780 | pin = 1; |
d00aff00 | 2781 | } |
4bef0848 CM |
2782 | |
2783 | /* if data pin when any transaction has committed this */ | |
2784 | if (ref_generation != trans->transid) | |
2785 | pin = 1; | |
2786 | ||
31840ae1 | 2787 | ret = __free_extent(trans, root, bytenr, num_bytes, parent, |
3bb1a1bc YZ |
2788 | root_objectid, ref_generation, |
2789 | owner_objectid, pin, pin == 0); | |
ee6e6504 | 2790 | |
87ef2bb4 CM |
2791 | finish_current_insert(trans, root->fs_info->extent_root, 0); |
2792 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root, 0); | |
fec577fb CM |
2793 | return ret ? ret : pending_ret; |
2794 | } | |
2795 | ||
925baedd | 2796 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
2797 | struct btrfs_root *root, |
2798 | u64 bytenr, u64 num_bytes, u64 parent, | |
2799 | u64 root_objectid, u64 ref_generation, | |
3bb1a1bc | 2800 | u64 owner_objectid, int pin) |
925baedd CM |
2801 | { |
2802 | int ret; | |
2803 | ||
31840ae1 | 2804 | ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent, |
925baedd | 2805 | root_objectid, ref_generation, |
3bb1a1bc | 2806 | owner_objectid, pin); |
925baedd CM |
2807 | return ret; |
2808 | } | |
2809 | ||
87ee04eb CM |
2810 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
2811 | { | |
2812 | u64 mask = ((u64)root->stripesize - 1); | |
2813 | u64 ret = (val + mask) & ~mask; | |
2814 | return ret; | |
2815 | } | |
2816 | ||
fec577fb CM |
2817 | /* |
2818 | * walks the btree of allocated extents and find a hole of a given size. | |
2819 | * The key ins is changed to record the hole: | |
2820 | * ins->objectid == block start | |
62e2749e | 2821 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
2822 | * ins->offset == number of blocks |
2823 | * Any available blocks before search_start are skipped. | |
2824 | */ | |
d397712b | 2825 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
2826 | struct btrfs_root *orig_root, |
2827 | u64 num_bytes, u64 empty_size, | |
2828 | u64 search_start, u64 search_end, | |
2829 | u64 hint_byte, struct btrfs_key *ins, | |
2830 | u64 exclude_start, u64 exclude_nr, | |
2831 | int data) | |
fec577fb | 2832 | { |
80eb234a | 2833 | int ret = 0; |
d397712b | 2834 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
db94535d | 2835 | u64 total_needed = num_bytes; |
239b14b3 | 2836 | u64 *last_ptr = NULL; |
4366211c | 2837 | u64 last_wanted = 0; |
80eb234a | 2838 | struct btrfs_block_group_cache *block_group = NULL; |
0ef3e66b | 2839 | int chunk_alloc_done = 0; |
239b14b3 | 2840 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 2841 | int allowed_chunk_alloc = 0; |
80eb234a JB |
2842 | struct list_head *head = NULL, *cur = NULL; |
2843 | int loop = 0; | |
f5a31e16 | 2844 | int extra_loop = 0; |
80eb234a | 2845 | struct btrfs_space_info *space_info; |
fec577fb | 2846 | |
db94535d | 2847 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 2848 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
2849 | ins->objectid = 0; |
2850 | ins->offset = 0; | |
b1a4d965 | 2851 | |
0ef3e66b CM |
2852 | if (orig_root->ref_cows || empty_size) |
2853 | allowed_chunk_alloc = 1; | |
2854 | ||
239b14b3 CM |
2855 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
2856 | last_ptr = &root->fs_info->last_alloc; | |
4366211c | 2857 | empty_cluster = 64 * 1024; |
239b14b3 CM |
2858 | } |
2859 | ||
0f9dd46c | 2860 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) |
239b14b3 | 2861 | last_ptr = &root->fs_info->last_data_alloc; |
0f9dd46c | 2862 | |
239b14b3 | 2863 | if (last_ptr) { |
4366211c | 2864 | if (*last_ptr) { |
239b14b3 | 2865 | hint_byte = *last_ptr; |
4366211c CM |
2866 | last_wanted = *last_ptr; |
2867 | } else | |
239b14b3 | 2868 | empty_size += empty_cluster; |
4366211c CM |
2869 | } else { |
2870 | empty_cluster = 0; | |
239b14b3 | 2871 | } |
a061fc8d | 2872 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 2873 | search_start = max(search_start, hint_byte); |
0b86a832 | 2874 | |
42e70e7a | 2875 | if (last_wanted && search_start != last_wanted) { |
4366211c | 2876 | last_wanted = 0; |
42e70e7a CM |
2877 | empty_size += empty_cluster; |
2878 | } | |
4366211c | 2879 | |
42e70e7a | 2880 | total_needed += empty_size; |
80eb234a | 2881 | block_group = btrfs_lookup_block_group(root->fs_info, search_start); |
d899e052 YZ |
2882 | if (!block_group) |
2883 | block_group = btrfs_lookup_first_block_group(root->fs_info, | |
2884 | search_start); | |
80eb234a | 2885 | space_info = __find_space_info(root->fs_info, data); |
0f9dd46c | 2886 | |
80eb234a JB |
2887 | down_read(&space_info->groups_sem); |
2888 | while (1) { | |
2889 | struct btrfs_free_space *free_space; | |
0f9dd46c | 2890 | /* |
80eb234a JB |
2891 | * the only way this happens if our hint points to a block |
2892 | * group thats not of the proper type, while looping this | |
2893 | * should never happen | |
0f9dd46c | 2894 | */ |
8a1413a2 CM |
2895 | if (empty_size) |
2896 | extra_loop = 1; | |
2897 | ||
42e70e7a CM |
2898 | if (!block_group) |
2899 | goto new_group_no_lock; | |
2900 | ||
ea6a478e JB |
2901 | if (unlikely(!block_group->cached)) { |
2902 | mutex_lock(&block_group->cache_mutex); | |
2903 | ret = cache_block_group(root, block_group); | |
2904 | mutex_unlock(&block_group->cache_mutex); | |
2905 | if (ret) | |
2906 | break; | |
2907 | } | |
2908 | ||
25179201 | 2909 | mutex_lock(&block_group->alloc_mutex); |
80eb234a | 2910 | if (unlikely(!block_group_bits(block_group, data))) |
0f9dd46c | 2911 | goto new_group; |
0f9dd46c | 2912 | |
ea6a478e | 2913 | if (unlikely(block_group->ro)) |
80eb234a | 2914 | goto new_group; |
0f9dd46c | 2915 | |
80eb234a JB |
2916 | free_space = btrfs_find_free_space(block_group, search_start, |
2917 | total_needed); | |
2918 | if (free_space) { | |
2919 | u64 start = block_group->key.objectid; | |
2920 | u64 end = block_group->key.objectid + | |
0f9dd46c | 2921 | block_group->key.offset; |
239b14b3 | 2922 | |
80eb234a | 2923 | search_start = stripe_align(root, free_space->offset); |
0f9dd46c | 2924 | |
80eb234a JB |
2925 | /* move on to the next group */ |
2926 | if (search_start + num_bytes >= search_end) | |
2927 | goto new_group; | |
e37c9e69 | 2928 | |
80eb234a JB |
2929 | /* move on to the next group */ |
2930 | if (search_start + num_bytes > end) | |
2931 | goto new_group; | |
2932 | ||
4366211c | 2933 | if (last_wanted && search_start != last_wanted) { |
3b7885bf | 2934 | total_needed += empty_cluster; |
8a1413a2 | 2935 | empty_size += empty_cluster; |
4366211c | 2936 | last_wanted = 0; |
3b7885bf CM |
2937 | /* |
2938 | * if search_start is still in this block group | |
2939 | * then we just re-search this block group | |
2940 | */ | |
2941 | if (search_start >= start && | |
2942 | search_start < end) { | |
2943 | mutex_unlock(&block_group->alloc_mutex); | |
2944 | continue; | |
2945 | } | |
2946 | ||
2947 | /* else we go to the next block group */ | |
2948 | goto new_group; | |
2949 | } | |
2950 | ||
80eb234a JB |
2951 | if (exclude_nr > 0 && |
2952 | (search_start + num_bytes > exclude_start && | |
2953 | search_start < exclude_start + exclude_nr)) { | |
2954 | search_start = exclude_start + exclude_nr; | |
2955 | /* | |
2956 | * if search_start is still in this block group | |
2957 | * then we just re-search this block group | |
2958 | */ | |
2959 | if (search_start >= start && | |
25179201 JB |
2960 | search_start < end) { |
2961 | mutex_unlock(&block_group->alloc_mutex); | |
4366211c | 2962 | last_wanted = 0; |
80eb234a | 2963 | continue; |
25179201 | 2964 | } |
80eb234a JB |
2965 | |
2966 | /* else we go to the next block group */ | |
2967 | goto new_group; | |
2968 | } | |
2969 | ||
2970 | ins->objectid = search_start; | |
2971 | ins->offset = num_bytes; | |
25179201 JB |
2972 | |
2973 | btrfs_remove_free_space_lock(block_group, search_start, | |
2974 | num_bytes); | |
80eb234a | 2975 | /* we are all good, lets return */ |
25179201 | 2976 | mutex_unlock(&block_group->alloc_mutex); |
80eb234a | 2977 | break; |
0f9dd46c | 2978 | } |
80eb234a | 2979 | new_group: |
42e70e7a | 2980 | mutex_unlock(&block_group->alloc_mutex); |
d2fb3437 YZ |
2981 | put_block_group(block_group); |
2982 | block_group = NULL; | |
42e70e7a | 2983 | new_group_no_lock: |
f5a31e16 CM |
2984 | /* don't try to compare new allocations against the |
2985 | * last allocation any more | |
2986 | */ | |
4366211c | 2987 | last_wanted = 0; |
f5a31e16 | 2988 | |
80eb234a JB |
2989 | /* |
2990 | * Here's how this works. | |
2991 | * loop == 0: we were searching a block group via a hint | |
2992 | * and didn't find anything, so we start at | |
2993 | * the head of the block groups and keep searching | |
2994 | * loop == 1: we're searching through all of the block groups | |
2995 | * if we hit the head again we have searched | |
2996 | * all of the block groups for this space and we | |
2997 | * need to try and allocate, if we cant error out. | |
2998 | * loop == 2: we allocated more space and are looping through | |
2999 | * all of the block groups again. | |
3000 | */ | |
3001 | if (loop == 0) { | |
3002 | head = &space_info->block_groups; | |
3003 | cur = head->next; | |
80eb234a JB |
3004 | loop++; |
3005 | } else if (loop == 1 && cur == head) { | |
f5a31e16 CM |
3006 | int keep_going; |
3007 | ||
3008 | /* at this point we give up on the empty_size | |
3009 | * allocations and just try to allocate the min | |
3010 | * space. | |
3011 | * | |
3012 | * The extra_loop field was set if an empty_size | |
3013 | * allocation was attempted above, and if this | |
3014 | * is try we need to try the loop again without | |
3015 | * the additional empty_size. | |
3016 | */ | |
5b7c3fcc CM |
3017 | total_needed -= empty_size; |
3018 | empty_size = 0; | |
f5a31e16 CM |
3019 | keep_going = extra_loop; |
3020 | loop++; | |
42e70e7a | 3021 | |
80eb234a JB |
3022 | if (allowed_chunk_alloc && !chunk_alloc_done) { |
3023 | up_read(&space_info->groups_sem); | |
3024 | ret = do_chunk_alloc(trans, root, num_bytes + | |
3025 | 2 * 1024 * 1024, data, 1); | |
80eb234a | 3026 | down_read(&space_info->groups_sem); |
2ed6d664 CM |
3027 | if (ret < 0) |
3028 | goto loop_check; | |
80eb234a | 3029 | head = &space_info->block_groups; |
f5a31e16 CM |
3030 | /* |
3031 | * we've allocated a new chunk, keep | |
3032 | * trying | |
3033 | */ | |
3034 | keep_going = 1; | |
80eb234a JB |
3035 | chunk_alloc_done = 1; |
3036 | } else if (!allowed_chunk_alloc) { | |
3037 | space_info->force_alloc = 1; | |
f5a31e16 | 3038 | } |
2ed6d664 | 3039 | loop_check: |
f5a31e16 CM |
3040 | if (keep_going) { |
3041 | cur = head->next; | |
3042 | extra_loop = 0; | |
80eb234a JB |
3043 | } else { |
3044 | break; | |
3045 | } | |
3046 | } else if (cur == head) { | |
3047 | break; | |
0f9dd46c | 3048 | } |
0b86a832 | 3049 | |
80eb234a JB |
3050 | block_group = list_entry(cur, struct btrfs_block_group_cache, |
3051 | list); | |
d2fb3437 YZ |
3052 | atomic_inc(&block_group->count); |
3053 | ||
80eb234a JB |
3054 | search_start = block_group->key.objectid; |
3055 | cur = cur->next; | |
f2654de4 | 3056 | } |
0b86a832 | 3057 | |
80eb234a JB |
3058 | /* we found what we needed */ |
3059 | if (ins->objectid) { | |
3060 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) | |
d2fb3437 | 3061 | trans->block_group = block_group->key.objectid; |
0f9dd46c | 3062 | |
80eb234a JB |
3063 | if (last_ptr) |
3064 | *last_ptr = ins->objectid + ins->offset; | |
3065 | ret = 0; | |
3066 | } else if (!ret) { | |
d397712b CM |
3067 | printk(KERN_ERR "btrfs searching for %llu bytes, " |
3068 | "num_bytes %llu, loop %d, allowed_alloc %d\n", | |
3069 | (unsigned long long)total_needed, | |
3070 | (unsigned long long)num_bytes, | |
4ce4cb52 | 3071 | loop, allowed_chunk_alloc); |
80eb234a | 3072 | ret = -ENOSPC; |
be744175 | 3073 | } |
d2fb3437 YZ |
3074 | if (block_group) |
3075 | put_block_group(block_group); | |
be744175 | 3076 | |
80eb234a | 3077 | up_read(&space_info->groups_sem); |
0f70abe2 | 3078 | return ret; |
fec577fb | 3079 | } |
ec44a35c | 3080 | |
0f9dd46c JB |
3081 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes) |
3082 | { | |
3083 | struct btrfs_block_group_cache *cache; | |
0f9dd46c | 3084 | |
d397712b CM |
3085 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
3086 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
3087 | info->bytes_pinned - info->bytes_reserved), | |
3088 | (info->full) ? "" : "not "); | |
0f9dd46c | 3089 | |
80eb234a | 3090 | down_read(&info->groups_sem); |
c6e30871 | 3091 | list_for_each_entry(cache, &info->block_groups, list) { |
0f9dd46c | 3092 | spin_lock(&cache->lock); |
d397712b CM |
3093 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
3094 | "%llu pinned %llu reserved\n", | |
3095 | (unsigned long long)cache->key.objectid, | |
3096 | (unsigned long long)cache->key.offset, | |
3097 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
3098 | (unsigned long long)cache->pinned, | |
3099 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
3100 | btrfs_dump_free_space(cache, bytes); |
3101 | spin_unlock(&cache->lock); | |
3102 | } | |
80eb234a | 3103 | up_read(&info->groups_sem); |
0f9dd46c | 3104 | } |
e8569813 | 3105 | |
e6dcd2dc CM |
3106 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
3107 | struct btrfs_root *root, | |
3108 | u64 num_bytes, u64 min_alloc_size, | |
3109 | u64 empty_size, u64 hint_byte, | |
3110 | u64 search_end, struct btrfs_key *ins, | |
3111 | u64 data) | |
fec577fb CM |
3112 | { |
3113 | int ret; | |
fbdc762b | 3114 | u64 search_start = 0; |
8790d502 | 3115 | u64 alloc_profile; |
1261ec42 | 3116 | struct btrfs_fs_info *info = root->fs_info; |
925baedd | 3117 | |
6324fbf3 | 3118 | if (data) { |
8790d502 | 3119 | alloc_profile = info->avail_data_alloc_bits & |
d397712b | 3120 | info->data_alloc_profile; |
8790d502 | 3121 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; |
6324fbf3 | 3122 | } else if (root == root->fs_info->chunk_root) { |
8790d502 | 3123 | alloc_profile = info->avail_system_alloc_bits & |
d397712b | 3124 | info->system_alloc_profile; |
8790d502 | 3125 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; |
6324fbf3 | 3126 | } else { |
8790d502 | 3127 | alloc_profile = info->avail_metadata_alloc_bits & |
d397712b | 3128 | info->metadata_alloc_profile; |
8790d502 | 3129 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; |
6324fbf3 | 3130 | } |
98d20f67 | 3131 | again: |
2b82032c | 3132 | data = btrfs_reduce_alloc_profile(root, data); |
0ef3e66b CM |
3133 | /* |
3134 | * the only place that sets empty_size is btrfs_realloc_node, which | |
3135 | * is not called recursively on allocations | |
3136 | */ | |
3137 | if (empty_size || root->ref_cows) { | |
593060d7 | 3138 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 3139 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
3140 | 2 * 1024 * 1024, |
3141 | BTRFS_BLOCK_GROUP_METADATA | | |
3142 | (info->metadata_alloc_profile & | |
3143 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
3144 | } |
3145 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 3146 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 | 3147 | } |
0b86a832 | 3148 | |
db94535d CM |
3149 | WARN_ON(num_bytes < root->sectorsize); |
3150 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
3151 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
3152 | trans->alloc_exclude_start, |
3153 | trans->alloc_exclude_nr, data); | |
3b951516 | 3154 | |
98d20f67 CM |
3155 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
3156 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 3157 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 3158 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b CM |
3159 | do_chunk_alloc(trans, root->fs_info->extent_root, |
3160 | num_bytes, data, 1); | |
98d20f67 CM |
3161 | goto again; |
3162 | } | |
ec44a35c | 3163 | if (ret) { |
0f9dd46c JB |
3164 | struct btrfs_space_info *sinfo; |
3165 | ||
3166 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
3167 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
3168 | "wanted %llu\n", (unsigned long long)data, | |
3169 | (unsigned long long)num_bytes); | |
0f9dd46c | 3170 | dump_space_info(sinfo, num_bytes); |
925baedd | 3171 | BUG(); |
925baedd | 3172 | } |
0f9dd46c JB |
3173 | |
3174 | return ret; | |
e6dcd2dc CM |
3175 | } |
3176 | ||
65b51a00 CM |
3177 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
3178 | { | |
0f9dd46c | 3179 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 3180 | int ret = 0; |
0f9dd46c | 3181 | |
0f9dd46c JB |
3182 | cache = btrfs_lookup_block_group(root->fs_info, start); |
3183 | if (!cache) { | |
d397712b CM |
3184 | printk(KERN_ERR "Unable to find block group for %llu\n", |
3185 | (unsigned long long)start); | |
0f9dd46c JB |
3186 | return -ENOSPC; |
3187 | } | |
1f3c79a2 LH |
3188 | |
3189 | ret = btrfs_discard_extent(root, start, len); | |
3190 | ||
0f9dd46c | 3191 | btrfs_add_free_space(cache, start, len); |
d2fb3437 | 3192 | put_block_group(cache); |
1a40e23b | 3193 | update_reserved_extents(root, start, len, 0); |
1f3c79a2 LH |
3194 | |
3195 | return ret; | |
65b51a00 CM |
3196 | } |
3197 | ||
e6dcd2dc CM |
3198 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
3199 | struct btrfs_root *root, | |
3200 | u64 num_bytes, u64 min_alloc_size, | |
3201 | u64 empty_size, u64 hint_byte, | |
3202 | u64 search_end, struct btrfs_key *ins, | |
3203 | u64 data) | |
3204 | { | |
3205 | int ret; | |
e6dcd2dc CM |
3206 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, |
3207 | empty_size, hint_byte, search_end, ins, | |
3208 | data); | |
e8569813 | 3209 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
e6dcd2dc CM |
3210 | return ret; |
3211 | } | |
3212 | ||
3213 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3214 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 3215 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3216 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
3217 | { |
3218 | int ret; | |
3219 | int pending_ret; | |
3220 | u64 super_used; | |
3221 | u64 root_used; | |
3222 | u64 num_bytes = ins->offset; | |
3223 | u32 sizes[2]; | |
3224 | struct btrfs_fs_info *info = root->fs_info; | |
3225 | struct btrfs_root *extent_root = info->extent_root; | |
3226 | struct btrfs_extent_item *extent_item; | |
3227 | struct btrfs_extent_ref *ref; | |
3228 | struct btrfs_path *path; | |
3229 | struct btrfs_key keys[2]; | |
fec577fb | 3230 | |
31840ae1 ZY |
3231 | if (parent == 0) |
3232 | parent = ins->objectid; | |
3233 | ||
58176a96 | 3234 | /* block accounting for super block */ |
75eff68e | 3235 | spin_lock(&info->delalloc_lock); |
db94535d CM |
3236 | super_used = btrfs_super_bytes_used(&info->super_copy); |
3237 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
26b8003f | 3238 | |
58176a96 | 3239 | /* block accounting for root item */ |
db94535d CM |
3240 | root_used = btrfs_root_used(&root->root_item); |
3241 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
34bf63c4 | 3242 | spin_unlock(&info->delalloc_lock); |
58176a96 | 3243 | |
26b8003f | 3244 | if (root == extent_root) { |
31840ae1 ZY |
3245 | struct pending_extent_op *extent_op; |
3246 | ||
3247 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
3248 | BUG_ON(!extent_op); | |
3249 | ||
3250 | extent_op->type = PENDING_EXTENT_INSERT; | |
3251 | extent_op->bytenr = ins->objectid; | |
3252 | extent_op->num_bytes = ins->offset; | |
3253 | extent_op->parent = parent; | |
3254 | extent_op->orig_parent = 0; | |
3255 | extent_op->generation = ref_generation; | |
3256 | extent_op->orig_generation = 0; | |
3257 | extent_op->level = (int)owner; | |
f3465ca4 JB |
3258 | INIT_LIST_HEAD(&extent_op->list); |
3259 | extent_op->del = 0; | |
31840ae1 | 3260 | |
25179201 | 3261 | mutex_lock(&root->fs_info->extent_ins_mutex); |
1a5bc167 CM |
3262 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
3263 | ins->objectid + ins->offset - 1, | |
25179201 | 3264 | EXTENT_WRITEBACK, GFP_NOFS); |
31840ae1 ZY |
3265 | set_state_private(&root->fs_info->extent_ins, |
3266 | ins->objectid, (unsigned long)extent_op); | |
25179201 | 3267 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
26b8003f CM |
3268 | goto update_block; |
3269 | } | |
3270 | ||
47e4bb98 | 3271 | memcpy(&keys[0], ins, sizeof(*ins)); |
47e4bb98 CM |
3272 | keys[1].objectid = ins->objectid; |
3273 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
31840ae1 | 3274 | keys[1].offset = parent; |
47e4bb98 CM |
3275 | sizes[0] = sizeof(*extent_item); |
3276 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
3277 | |
3278 | path = btrfs_alloc_path(); | |
3279 | BUG_ON(!path); | |
47e4bb98 CM |
3280 | |
3281 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, | |
3282 | sizes, 2); | |
ccd467d6 | 3283 | BUG_ON(ret); |
0f9dd46c | 3284 | |
47e4bb98 CM |
3285 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
3286 | struct btrfs_extent_item); | |
3287 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); | |
3288 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
3289 | struct btrfs_extent_ref); | |
3290 | ||
3291 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
3292 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
3293 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
31840ae1 | 3294 | btrfs_set_ref_num_refs(path->nodes[0], ref, 1); |
47e4bb98 CM |
3295 | |
3296 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3297 | ||
3298 | trans->alloc_exclude_start = 0; | |
3299 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 3300 | btrfs_free_path(path); |
87ef2bb4 CM |
3301 | finish_current_insert(trans, extent_root, 0); |
3302 | pending_ret = del_pending_extents(trans, extent_root, 0); | |
f510cfec | 3303 | |
925baedd CM |
3304 | if (ret) |
3305 | goto out; | |
e37c9e69 | 3306 | if (pending_ret) { |
925baedd CM |
3307 | ret = pending_ret; |
3308 | goto out; | |
e37c9e69 | 3309 | } |
26b8003f CM |
3310 | |
3311 | update_block: | |
d397712b CM |
3312 | ret = update_block_group(trans, root, ins->objectid, |
3313 | ins->offset, 1, 0); | |
f5947066 | 3314 | if (ret) { |
d397712b CM |
3315 | printk(KERN_ERR "btrfs update block group failed for %llu " |
3316 | "%llu\n", (unsigned long long)ins->objectid, | |
3317 | (unsigned long long)ins->offset); | |
f5947066 CM |
3318 | BUG(); |
3319 | } | |
925baedd | 3320 | out: |
e6dcd2dc CM |
3321 | return ret; |
3322 | } | |
3323 | ||
3324 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3325 | struct btrfs_root *root, u64 parent, |
e6dcd2dc | 3326 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3327 | u64 owner, struct btrfs_key *ins) |
e6dcd2dc CM |
3328 | { |
3329 | int ret; | |
1c2308f8 CM |
3330 | |
3331 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) | |
3332 | return 0; | |
3bb1a1bc YZ |
3333 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
3334 | ref_generation, owner, ins); | |
e8569813 | 3335 | update_reserved_extents(root, ins->objectid, ins->offset, 0); |
e6dcd2dc CM |
3336 | return ret; |
3337 | } | |
e02119d5 CM |
3338 | |
3339 | /* | |
3340 | * this is used by the tree logging recovery code. It records that | |
3341 | * an extent has been allocated and makes sure to clear the free | |
3342 | * space cache bits as well | |
3343 | */ | |
3344 | int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, | |
31840ae1 | 3345 | struct btrfs_root *root, u64 parent, |
e02119d5 | 3346 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3347 | u64 owner, struct btrfs_key *ins) |
e02119d5 CM |
3348 | { |
3349 | int ret; | |
3350 | struct btrfs_block_group_cache *block_group; | |
3351 | ||
e02119d5 | 3352 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
ea6a478e | 3353 | mutex_lock(&block_group->cache_mutex); |
e02119d5 | 3354 | cache_block_group(root, block_group); |
ea6a478e | 3355 | mutex_unlock(&block_group->cache_mutex); |
e02119d5 | 3356 | |
ea6a478e JB |
3357 | ret = btrfs_remove_free_space(block_group, ins->objectid, |
3358 | ins->offset); | |
0f9dd46c | 3359 | BUG_ON(ret); |
d2fb3437 | 3360 | put_block_group(block_group); |
3bb1a1bc YZ |
3361 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
3362 | ref_generation, owner, ins); | |
e02119d5 CM |
3363 | return ret; |
3364 | } | |
3365 | ||
e6dcd2dc CM |
3366 | /* |
3367 | * finds a free extent and does all the dirty work required for allocation | |
3368 | * returns the key for the extent through ins, and a tree buffer for | |
3369 | * the first block of the extent through buf. | |
3370 | * | |
3371 | * returns 0 if everything worked, non-zero otherwise. | |
3372 | */ | |
3373 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, | |
3374 | struct btrfs_root *root, | |
31840ae1 | 3375 | u64 num_bytes, u64 parent, u64 min_alloc_size, |
e6dcd2dc | 3376 | u64 root_objectid, u64 ref_generation, |
3bb1a1bc | 3377 | u64 owner_objectid, u64 empty_size, u64 hint_byte, |
e6dcd2dc CM |
3378 | u64 search_end, struct btrfs_key *ins, u64 data) |
3379 | { | |
3380 | int ret; | |
3381 | ||
e6dcd2dc CM |
3382 | ret = __btrfs_reserve_extent(trans, root, num_bytes, |
3383 | min_alloc_size, empty_size, hint_byte, | |
3384 | search_end, ins, data); | |
3385 | BUG_ON(ret); | |
d00aff00 | 3386 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
31840ae1 ZY |
3387 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, |
3388 | root_objectid, ref_generation, | |
3bb1a1bc | 3389 | owner_objectid, ins); |
d00aff00 | 3390 | BUG_ON(ret); |
e6dcd2dc | 3391 | |
e8569813 ZY |
3392 | } else { |
3393 | update_reserved_extents(root, ins->objectid, ins->offset, 1); | |
d00aff00 | 3394 | } |
925baedd | 3395 | return ret; |
fec577fb | 3396 | } |
65b51a00 CM |
3397 | |
3398 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, | |
3399 | struct btrfs_root *root, | |
3400 | u64 bytenr, u32 blocksize) | |
3401 | { | |
3402 | struct extent_buffer *buf; | |
3403 | ||
3404 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
3405 | if (!buf) | |
3406 | return ERR_PTR(-ENOMEM); | |
3407 | btrfs_set_header_generation(buf, trans->transid); | |
3408 | btrfs_tree_lock(buf); | |
3409 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
3410 | |
3411 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 3412 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 3413 | |
d0c803c4 CM |
3414 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
3415 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
3416 | buf->start + buf->len - 1, GFP_NOFS); | |
3417 | } else { | |
3418 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 3419 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 3420 | } |
65b51a00 | 3421 | trans->blocks_used++; |
b4ce94de | 3422 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
3423 | return buf; |
3424 | } | |
3425 | ||
fec577fb CM |
3426 | /* |
3427 | * helper function to allocate a block for a given tree | |
3428 | * returns the tree buffer or NULL. | |
3429 | */ | |
5f39d397 | 3430 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
7bb86316 | 3431 | struct btrfs_root *root, |
31840ae1 | 3432 | u32 blocksize, u64 parent, |
7bb86316 CM |
3433 | u64 root_objectid, |
3434 | u64 ref_generation, | |
7bb86316 CM |
3435 | int level, |
3436 | u64 hint, | |
5f39d397 | 3437 | u64 empty_size) |
fec577fb | 3438 | { |
e2fa7227 | 3439 | struct btrfs_key ins; |
fec577fb | 3440 | int ret; |
5f39d397 | 3441 | struct extent_buffer *buf; |
fec577fb | 3442 | |
31840ae1 | 3443 | ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, |
3bb1a1bc | 3444 | root_objectid, ref_generation, level, |
31840ae1 | 3445 | empty_size, hint, (u64)-1, &ins, 0); |
fec577fb | 3446 | if (ret) { |
54aa1f4d CM |
3447 | BUG_ON(ret > 0); |
3448 | return ERR_PTR(ret); | |
fec577fb | 3449 | } |
55c69072 | 3450 | |
65b51a00 | 3451 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize); |
fec577fb CM |
3452 | return buf; |
3453 | } | |
a28ec197 | 3454 | |
e02119d5 CM |
3455 | int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, |
3456 | struct btrfs_root *root, struct extent_buffer *leaf) | |
6407bf6d | 3457 | { |
7bb86316 CM |
3458 | u64 leaf_owner; |
3459 | u64 leaf_generation; | |
5f39d397 | 3460 | struct btrfs_key key; |
6407bf6d CM |
3461 | struct btrfs_file_extent_item *fi; |
3462 | int i; | |
3463 | int nritems; | |
3464 | int ret; | |
3465 | ||
5f39d397 CM |
3466 | BUG_ON(!btrfs_is_leaf(leaf)); |
3467 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
3468 | leaf_owner = btrfs_header_owner(leaf); |
3469 | leaf_generation = btrfs_header_generation(leaf); | |
3470 | ||
6407bf6d | 3471 | for (i = 0; i < nritems; i++) { |
db94535d | 3472 | u64 disk_bytenr; |
e34a5b4f | 3473 | cond_resched(); |
5f39d397 CM |
3474 | |
3475 | btrfs_item_key_to_cpu(leaf, &key, i); | |
3476 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d CM |
3477 | continue; |
3478 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
5f39d397 CM |
3479 | if (btrfs_file_extent_type(leaf, fi) == |
3480 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 3481 | continue; |
6407bf6d CM |
3482 | /* |
3483 | * FIXME make sure to insert a trans record that | |
3484 | * repeats the snapshot del on crash | |
3485 | */ | |
db94535d CM |
3486 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
3487 | if (disk_bytenr == 0) | |
3a686375 | 3488 | continue; |
4a096752 | 3489 | |
925baedd | 3490 | ret = __btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 | 3491 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
31840ae1 | 3492 | leaf->start, leaf_owner, leaf_generation, |
3bb1a1bc | 3493 | key.objectid, 0); |
31840ae1 | 3494 | BUG_ON(ret); |
2dd3e67b CM |
3495 | |
3496 | atomic_inc(&root->fs_info->throttle_gen); | |
3497 | wake_up(&root->fs_info->transaction_throttle); | |
3498 | cond_resched(); | |
6407bf6d CM |
3499 | } |
3500 | return 0; | |
3501 | } | |
3502 | ||
d397712b | 3503 | static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans, |
e02119d5 CM |
3504 | struct btrfs_root *root, |
3505 | struct btrfs_leaf_ref *ref) | |
31153d81 YZ |
3506 | { |
3507 | int i; | |
3508 | int ret; | |
3509 | struct btrfs_extent_info *info = ref->extents; | |
3510 | ||
31153d81 | 3511 | for (i = 0; i < ref->nritems; i++) { |
31840ae1 ZY |
3512 | ret = __btrfs_free_extent(trans, root, info->bytenr, |
3513 | info->num_bytes, ref->bytenr, | |
3514 | ref->owner, ref->generation, | |
3bb1a1bc | 3515 | info->objectid, 0); |
2dd3e67b CM |
3516 | |
3517 | atomic_inc(&root->fs_info->throttle_gen); | |
3518 | wake_up(&root->fs_info->transaction_throttle); | |
3519 | cond_resched(); | |
3520 | ||
31153d81 YZ |
3521 | BUG_ON(ret); |
3522 | info++; | |
3523 | } | |
31153d81 YZ |
3524 | |
3525 | return 0; | |
3526 | } | |
3527 | ||
d397712b CM |
3528 | static int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, |
3529 | u64 len, u32 *refs) | |
333db94c | 3530 | { |
017e5369 | 3531 | int ret; |
f87f057b | 3532 | |
31840ae1 | 3533 | ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs); |
f87f057b CM |
3534 | BUG_ON(ret); |
3535 | ||
d397712b | 3536 | #if 0 /* some debugging code in case we see problems here */ |
f87f057b CM |
3537 | /* if the refs count is one, it won't get increased again. But |
3538 | * if the ref count is > 1, someone may be decreasing it at | |
3539 | * the same time we are. | |
3540 | */ | |
3541 | if (*refs != 1) { | |
3542 | struct extent_buffer *eb = NULL; | |
3543 | eb = btrfs_find_create_tree_block(root, start, len); | |
3544 | if (eb) | |
3545 | btrfs_tree_lock(eb); | |
3546 | ||
3547 | mutex_lock(&root->fs_info->alloc_mutex); | |
3548 | ret = lookup_extent_ref(NULL, root, start, len, refs); | |
3549 | BUG_ON(ret); | |
3550 | mutex_unlock(&root->fs_info->alloc_mutex); | |
3551 | ||
3552 | if (eb) { | |
3553 | btrfs_tree_unlock(eb); | |
3554 | free_extent_buffer(eb); | |
3555 | } | |
3556 | if (*refs == 1) { | |
d397712b CM |
3557 | printk(KERN_ERR "btrfs block %llu went down to one " |
3558 | "during drop_snap\n", (unsigned long long)start); | |
f87f057b CM |
3559 | } |
3560 | ||
3561 | } | |
3562 | #endif | |
3563 | ||
e7a84565 | 3564 | cond_resched(); |
017e5369 | 3565 | return ret; |
333db94c CM |
3566 | } |
3567 | ||
9aca1d51 CM |
3568 | /* |
3569 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
3570 | * counts as it goes. | |
3571 | */ | |
d397712b | 3572 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
98ed5174 CM |
3573 | struct btrfs_root *root, |
3574 | struct btrfs_path *path, int *level) | |
20524f02 | 3575 | { |
7bb86316 CM |
3576 | u64 root_owner; |
3577 | u64 root_gen; | |
3578 | u64 bytenr; | |
ca7a79ad | 3579 | u64 ptr_gen; |
5f39d397 CM |
3580 | struct extent_buffer *next; |
3581 | struct extent_buffer *cur; | |
7bb86316 | 3582 | struct extent_buffer *parent; |
31153d81 | 3583 | struct btrfs_leaf_ref *ref; |
db94535d | 3584 | u32 blocksize; |
20524f02 CM |
3585 | int ret; |
3586 | u32 refs; | |
3587 | ||
5caf2a00 CM |
3588 | WARN_ON(*level < 0); |
3589 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
333db94c | 3590 | ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start, |
db94535d | 3591 | path->nodes[*level]->len, &refs); |
20524f02 CM |
3592 | BUG_ON(ret); |
3593 | if (refs > 1) | |
3594 | goto out; | |
e011599b | 3595 | |
9aca1d51 CM |
3596 | /* |
3597 | * walk down to the last node level and free all the leaves | |
3598 | */ | |
d397712b | 3599 | while (*level >= 0) { |
5caf2a00 CM |
3600 | WARN_ON(*level < 0); |
3601 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 3602 | cur = path->nodes[*level]; |
e011599b | 3603 | |
5f39d397 | 3604 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 3605 | WARN_ON(1); |
e011599b | 3606 | |
7518a238 | 3607 | if (path->slots[*level] >= |
5f39d397 | 3608 | btrfs_header_nritems(cur)) |
20524f02 | 3609 | break; |
6407bf6d | 3610 | if (*level == 0) { |
e02119d5 | 3611 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
6407bf6d CM |
3612 | BUG_ON(ret); |
3613 | break; | |
3614 | } | |
db94535d | 3615 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
ca7a79ad | 3616 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
db94535d | 3617 | blocksize = btrfs_level_size(root, *level - 1); |
925baedd | 3618 | |
333db94c | 3619 | ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs); |
6407bf6d CM |
3620 | BUG_ON(ret); |
3621 | if (refs != 1) { | |
7bb86316 CM |
3622 | parent = path->nodes[*level]; |
3623 | root_owner = btrfs_header_owner(parent); | |
3624 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 3625 | path->slots[*level]++; |
f87f057b | 3626 | |
925baedd | 3627 | ret = __btrfs_free_extent(trans, root, bytenr, |
31840ae1 | 3628 | blocksize, parent->start, |
3bb1a1bc YZ |
3629 | root_owner, root_gen, |
3630 | *level - 1, 1); | |
20524f02 | 3631 | BUG_ON(ret); |
18e35e0a CM |
3632 | |
3633 | atomic_inc(&root->fs_info->throttle_gen); | |
3634 | wake_up(&root->fs_info->transaction_throttle); | |
2dd3e67b | 3635 | cond_resched(); |
18e35e0a | 3636 | |
20524f02 CM |
3637 | continue; |
3638 | } | |
f87f057b CM |
3639 | /* |
3640 | * at this point, we have a single ref, and since the | |
3641 | * only place referencing this extent is a dead root | |
3642 | * the reference count should never go higher. | |
3643 | * So, we don't need to check it again | |
3644 | */ | |
31153d81 | 3645 | if (*level == 1) { |
017e5369 | 3646 | ref = btrfs_lookup_leaf_ref(root, bytenr); |
1a40e23b ZY |
3647 | if (ref && ref->generation != ptr_gen) { |
3648 | btrfs_free_leaf_ref(root, ref); | |
3649 | ref = NULL; | |
3650 | } | |
31153d81 | 3651 | if (ref) { |
e02119d5 | 3652 | ret = cache_drop_leaf_ref(trans, root, ref); |
31153d81 YZ |
3653 | BUG_ON(ret); |
3654 | btrfs_remove_leaf_ref(root, ref); | |
bcc63abb | 3655 | btrfs_free_leaf_ref(root, ref); |
31153d81 YZ |
3656 | *level = 0; |
3657 | break; | |
3658 | } | |
3659 | } | |
db94535d | 3660 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
1259ab75 | 3661 | if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
5f39d397 | 3662 | free_extent_buffer(next); |
333db94c | 3663 | |
ca7a79ad CM |
3664 | next = read_tree_block(root, bytenr, blocksize, |
3665 | ptr_gen); | |
e7a84565 | 3666 | cond_resched(); |
f87f057b CM |
3667 | #if 0 |
3668 | /* | |
3669 | * this is a debugging check and can go away | |
3670 | * the ref should never go all the way down to 1 | |
3671 | * at this point | |
3672 | */ | |
e6dcd2dc CM |
3673 | ret = lookup_extent_ref(NULL, root, bytenr, blocksize, |
3674 | &refs); | |
e9d0b13b | 3675 | BUG_ON(ret); |
f87f057b CM |
3676 | WARN_ON(refs != 1); |
3677 | #endif | |
e9d0b13b | 3678 | } |
5caf2a00 | 3679 | WARN_ON(*level <= 0); |
83e15a28 | 3680 | if (path->nodes[*level-1]) |
5f39d397 | 3681 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 3682 | path->nodes[*level-1] = next; |
5f39d397 | 3683 | *level = btrfs_header_level(next); |
20524f02 | 3684 | path->slots[*level] = 0; |
2dd3e67b | 3685 | cond_resched(); |
20524f02 CM |
3686 | } |
3687 | out: | |
5caf2a00 CM |
3688 | WARN_ON(*level < 0); |
3689 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
3690 | |
3691 | if (path->nodes[*level] == root->node) { | |
7bb86316 | 3692 | parent = path->nodes[*level]; |
31153d81 | 3693 | bytenr = path->nodes[*level]->start; |
7bb86316 CM |
3694 | } else { |
3695 | parent = path->nodes[*level + 1]; | |
31153d81 | 3696 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
7bb86316 CM |
3697 | } |
3698 | ||
31153d81 YZ |
3699 | blocksize = btrfs_level_size(root, *level); |
3700 | root_owner = btrfs_header_owner(parent); | |
7bb86316 | 3701 | root_gen = btrfs_header_generation(parent); |
31153d81 YZ |
3702 | |
3703 | ret = __btrfs_free_extent(trans, root, bytenr, blocksize, | |
31840ae1 | 3704 | parent->start, root_owner, root_gen, |
3bb1a1bc | 3705 | *level, 1); |
5f39d397 | 3706 | free_extent_buffer(path->nodes[*level]); |
20524f02 CM |
3707 | path->nodes[*level] = NULL; |
3708 | *level += 1; | |
3709 | BUG_ON(ret); | |
f87f057b | 3710 | |
e7a84565 | 3711 | cond_resched(); |
20524f02 CM |
3712 | return 0; |
3713 | } | |
3714 | ||
f82d02d9 YZ |
3715 | /* |
3716 | * helper function for drop_subtree, this function is similar to | |
3717 | * walk_down_tree. The main difference is that it checks reference | |
3718 | * counts while tree blocks are locked. | |
3719 | */ | |
d397712b | 3720 | static noinline int walk_down_subtree(struct btrfs_trans_handle *trans, |
f82d02d9 YZ |
3721 | struct btrfs_root *root, |
3722 | struct btrfs_path *path, int *level) | |
3723 | { | |
3724 | struct extent_buffer *next; | |
3725 | struct extent_buffer *cur; | |
3726 | struct extent_buffer *parent; | |
3727 | u64 bytenr; | |
3728 | u64 ptr_gen; | |
3729 | u32 blocksize; | |
3730 | u32 refs; | |
3731 | int ret; | |
3732 | ||
3733 | cur = path->nodes[*level]; | |
3734 | ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len, | |
3735 | &refs); | |
3736 | BUG_ON(ret); | |
3737 | if (refs > 1) | |
3738 | goto out; | |
3739 | ||
3740 | while (*level >= 0) { | |
3741 | cur = path->nodes[*level]; | |
3742 | if (*level == 0) { | |
3743 | ret = btrfs_drop_leaf_ref(trans, root, cur); | |
3744 | BUG_ON(ret); | |
3745 | clean_tree_block(trans, root, cur); | |
3746 | break; | |
3747 | } | |
3748 | if (path->slots[*level] >= btrfs_header_nritems(cur)) { | |
3749 | clean_tree_block(trans, root, cur); | |
3750 | break; | |
3751 | } | |
3752 | ||
3753 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
3754 | blocksize = btrfs_level_size(root, *level - 1); | |
3755 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
3756 | ||
3757 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); | |
3758 | btrfs_tree_lock(next); | |
b4ce94de | 3759 | btrfs_set_lock_blocking(next); |
f82d02d9 YZ |
3760 | |
3761 | ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize, | |
3762 | &refs); | |
3763 | BUG_ON(ret); | |
3764 | if (refs > 1) { | |
3765 | parent = path->nodes[*level]; | |
3766 | ret = btrfs_free_extent(trans, root, bytenr, | |
3767 | blocksize, parent->start, | |
3768 | btrfs_header_owner(parent), | |
3769 | btrfs_header_generation(parent), | |
3770 | *level - 1, 1); | |
3771 | BUG_ON(ret); | |
3772 | path->slots[*level]++; | |
3773 | btrfs_tree_unlock(next); | |
3774 | free_extent_buffer(next); | |
3775 | continue; | |
3776 | } | |
3777 | ||
3778 | *level = btrfs_header_level(next); | |
3779 | path->nodes[*level] = next; | |
3780 | path->slots[*level] = 0; | |
3781 | path->locks[*level] = 1; | |
3782 | cond_resched(); | |
3783 | } | |
3784 | out: | |
3785 | parent = path->nodes[*level + 1]; | |
3786 | bytenr = path->nodes[*level]->start; | |
3787 | blocksize = path->nodes[*level]->len; | |
3788 | ||
3789 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, | |
3790 | parent->start, btrfs_header_owner(parent), | |
3791 | btrfs_header_generation(parent), *level, 1); | |
3792 | BUG_ON(ret); | |
3793 | ||
3794 | if (path->locks[*level]) { | |
3795 | btrfs_tree_unlock(path->nodes[*level]); | |
3796 | path->locks[*level] = 0; | |
3797 | } | |
3798 | free_extent_buffer(path->nodes[*level]); | |
3799 | path->nodes[*level] = NULL; | |
3800 | *level += 1; | |
3801 | cond_resched(); | |
3802 | return 0; | |
3803 | } | |
3804 | ||
9aca1d51 CM |
3805 | /* |
3806 | * helper for dropping snapshots. This walks back up the tree in the path | |
3807 | * to find the first node higher up where we haven't yet gone through | |
3808 | * all the slots | |
3809 | */ | |
d397712b | 3810 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 3811 | struct btrfs_root *root, |
f82d02d9 YZ |
3812 | struct btrfs_path *path, |
3813 | int *level, int max_level) | |
20524f02 | 3814 | { |
7bb86316 CM |
3815 | u64 root_owner; |
3816 | u64 root_gen; | |
3817 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
3818 | int i; |
3819 | int slot; | |
3820 | int ret; | |
9f3a7427 | 3821 | |
f82d02d9 | 3822 | for (i = *level; i < max_level && path->nodes[i]; i++) { |
20524f02 | 3823 | slot = path->slots[i]; |
5f39d397 CM |
3824 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
3825 | struct extent_buffer *node; | |
3826 | struct btrfs_disk_key disk_key; | |
3827 | node = path->nodes[i]; | |
20524f02 CM |
3828 | path->slots[i]++; |
3829 | *level = i; | |
9f3a7427 | 3830 | WARN_ON(*level == 0); |
5f39d397 | 3831 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 3832 | memcpy(&root_item->drop_progress, |
5f39d397 | 3833 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 3834 | root_item->drop_level = i; |
20524f02 CM |
3835 | return 0; |
3836 | } else { | |
31840ae1 ZY |
3837 | struct extent_buffer *parent; |
3838 | if (path->nodes[*level] == root->node) | |
3839 | parent = path->nodes[*level]; | |
3840 | else | |
3841 | parent = path->nodes[*level + 1]; | |
3842 | ||
3843 | root_owner = btrfs_header_owner(parent); | |
3844 | root_gen = btrfs_header_generation(parent); | |
f82d02d9 YZ |
3845 | |
3846 | clean_tree_block(trans, root, path->nodes[*level]); | |
e089f05c | 3847 | ret = btrfs_free_extent(trans, root, |
db94535d | 3848 | path->nodes[*level]->start, |
7bb86316 | 3849 | path->nodes[*level]->len, |
3bb1a1bc YZ |
3850 | parent->start, root_owner, |
3851 | root_gen, *level, 1); | |
6407bf6d | 3852 | BUG_ON(ret); |
f82d02d9 YZ |
3853 | if (path->locks[*level]) { |
3854 | btrfs_tree_unlock(path->nodes[*level]); | |
3855 | path->locks[*level] = 0; | |
3856 | } | |
5f39d397 | 3857 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 3858 | path->nodes[*level] = NULL; |
20524f02 | 3859 | *level = i + 1; |
20524f02 CM |
3860 | } |
3861 | } | |
3862 | return 1; | |
3863 | } | |
3864 | ||
9aca1d51 CM |
3865 | /* |
3866 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
3867 | * the tree freeing any blocks that have a ref count of zero after being | |
3868 | * decremented. | |
3869 | */ | |
e089f05c | 3870 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 3871 | *root) |
20524f02 | 3872 | { |
3768f368 | 3873 | int ret = 0; |
9aca1d51 | 3874 | int wret; |
20524f02 | 3875 | int level; |
5caf2a00 | 3876 | struct btrfs_path *path; |
20524f02 CM |
3877 | int i; |
3878 | int orig_level; | |
9f3a7427 | 3879 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 3880 | |
a2135011 | 3881 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
5caf2a00 CM |
3882 | path = btrfs_alloc_path(); |
3883 | BUG_ON(!path); | |
20524f02 | 3884 | |
5f39d397 | 3885 | level = btrfs_header_level(root->node); |
20524f02 | 3886 | orig_level = level; |
9f3a7427 CM |
3887 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
3888 | path->nodes[level] = root->node; | |
f510cfec | 3889 | extent_buffer_get(root->node); |
9f3a7427 CM |
3890 | path->slots[level] = 0; |
3891 | } else { | |
3892 | struct btrfs_key key; | |
5f39d397 CM |
3893 | struct btrfs_disk_key found_key; |
3894 | struct extent_buffer *node; | |
6702ed49 | 3895 | |
9f3a7427 | 3896 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
3897 | level = root_item->drop_level; |
3898 | path->lowest_level = level; | |
9f3a7427 | 3899 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 3900 | if (wret < 0) { |
9f3a7427 CM |
3901 | ret = wret; |
3902 | goto out; | |
3903 | } | |
5f39d397 CM |
3904 | node = path->nodes[level]; |
3905 | btrfs_node_key(node, &found_key, path->slots[level]); | |
3906 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
3907 | sizeof(found_key))); | |
7d9eb12c CM |
3908 | /* |
3909 | * unlock our path, this is safe because only this | |
3910 | * function is allowed to delete this snapshot | |
3911 | */ | |
925baedd CM |
3912 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
3913 | if (path->nodes[i] && path->locks[i]) { | |
3914 | path->locks[i] = 0; | |
3915 | btrfs_tree_unlock(path->nodes[i]); | |
3916 | } | |
3917 | } | |
9f3a7427 | 3918 | } |
d397712b | 3919 | while (1) { |
5caf2a00 | 3920 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 3921 | if (wret > 0) |
20524f02 | 3922 | break; |
9aca1d51 CM |
3923 | if (wret < 0) |
3924 | ret = wret; | |
3925 | ||
f82d02d9 YZ |
3926 | wret = walk_up_tree(trans, root, path, &level, |
3927 | BTRFS_MAX_LEVEL); | |
9aca1d51 | 3928 | if (wret > 0) |
20524f02 | 3929 | break; |
9aca1d51 CM |
3930 | if (wret < 0) |
3931 | ret = wret; | |
e7a84565 CM |
3932 | if (trans->transaction->in_commit) { |
3933 | ret = -EAGAIN; | |
3934 | break; | |
3935 | } | |
18e35e0a | 3936 | atomic_inc(&root->fs_info->throttle_gen); |
017e5369 | 3937 | wake_up(&root->fs_info->transaction_throttle); |
20524f02 | 3938 | } |
83e15a28 | 3939 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 3940 | if (path->nodes[i]) { |
5f39d397 | 3941 | free_extent_buffer(path->nodes[i]); |
0f82731f | 3942 | path->nodes[i] = NULL; |
83e15a28 | 3943 | } |
20524f02 | 3944 | } |
9f3a7427 | 3945 | out: |
5caf2a00 | 3946 | btrfs_free_path(path); |
9aca1d51 | 3947 | return ret; |
20524f02 | 3948 | } |
9078a3e1 | 3949 | |
f82d02d9 YZ |
3950 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
3951 | struct btrfs_root *root, | |
3952 | struct extent_buffer *node, | |
3953 | struct extent_buffer *parent) | |
3954 | { | |
3955 | struct btrfs_path *path; | |
3956 | int level; | |
3957 | int parent_level; | |
3958 | int ret = 0; | |
3959 | int wret; | |
3960 | ||
3961 | path = btrfs_alloc_path(); | |
3962 | BUG_ON(!path); | |
3963 | ||
3964 | BUG_ON(!btrfs_tree_locked(parent)); | |
3965 | parent_level = btrfs_header_level(parent); | |
3966 | extent_buffer_get(parent); | |
3967 | path->nodes[parent_level] = parent; | |
3968 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
3969 | ||
3970 | BUG_ON(!btrfs_tree_locked(node)); | |
3971 | level = btrfs_header_level(node); | |
3972 | extent_buffer_get(node); | |
3973 | path->nodes[level] = node; | |
3974 | path->slots[level] = 0; | |
3975 | ||
3976 | while (1) { | |
3977 | wret = walk_down_subtree(trans, root, path, &level); | |
3978 | if (wret < 0) | |
3979 | ret = wret; | |
3980 | if (wret != 0) | |
3981 | break; | |
3982 | ||
3983 | wret = walk_up_tree(trans, root, path, &level, parent_level); | |
3984 | if (wret < 0) | |
3985 | ret = wret; | |
3986 | if (wret != 0) | |
3987 | break; | |
3988 | } | |
3989 | ||
3990 | btrfs_free_path(path); | |
3991 | return ret; | |
3992 | } | |
3993 | ||
8e7bf94f CM |
3994 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
3995 | unsigned long nr) | |
3996 | { | |
3997 | return min(last, start + nr - 1); | |
3998 | } | |
3999 | ||
d397712b | 4000 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
98ed5174 | 4001 | u64 len) |
edbd8d4e CM |
4002 | { |
4003 | u64 page_start; | |
4004 | u64 page_end; | |
1a40e23b | 4005 | unsigned long first_index; |
edbd8d4e | 4006 | unsigned long last_index; |
edbd8d4e CM |
4007 | unsigned long i; |
4008 | struct page *page; | |
d1310b2e | 4009 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 4010 | struct file_ra_state *ra; |
3eaa2885 | 4011 | struct btrfs_ordered_extent *ordered; |
1a40e23b ZY |
4012 | unsigned int total_read = 0; |
4013 | unsigned int total_dirty = 0; | |
4014 | int ret = 0; | |
4313b399 CM |
4015 | |
4016 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
4017 | |
4018 | mutex_lock(&inode->i_mutex); | |
1a40e23b | 4019 | first_index = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
4020 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
4021 | ||
1a40e23b ZY |
4022 | /* make sure the dirty trick played by the caller work */ |
4023 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
4024 | first_index, last_index); | |
4025 | if (ret) | |
4026 | goto out_unlock; | |
8e7bf94f | 4027 | |
4313b399 | 4028 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 4029 | |
1a40e23b ZY |
4030 | for (i = first_index ; i <= last_index; i++) { |
4031 | if (total_read % ra->ra_pages == 0) { | |
8e7bf94f | 4032 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
1a40e23b | 4033 | calc_ra(i, last_index, ra->ra_pages)); |
8e7bf94f CM |
4034 | } |
4035 | total_read++; | |
3eaa2885 CM |
4036 | again: |
4037 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
1a40e23b | 4038 | BUG_ON(1); |
edbd8d4e | 4039 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 4040 | if (!page) { |
1a40e23b | 4041 | ret = -ENOMEM; |
edbd8d4e | 4042 | goto out_unlock; |
a061fc8d | 4043 | } |
edbd8d4e CM |
4044 | if (!PageUptodate(page)) { |
4045 | btrfs_readpage(NULL, page); | |
4046 | lock_page(page); | |
4047 | if (!PageUptodate(page)) { | |
4048 | unlock_page(page); | |
4049 | page_cache_release(page); | |
1a40e23b | 4050 | ret = -EIO; |
edbd8d4e CM |
4051 | goto out_unlock; |
4052 | } | |
4053 | } | |
ec44a35c | 4054 | wait_on_page_writeback(page); |
3eaa2885 | 4055 | |
edbd8d4e CM |
4056 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
4057 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 4058 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 4059 | |
3eaa2885 CM |
4060 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
4061 | if (ordered) { | |
4062 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
4063 | unlock_page(page); | |
4064 | page_cache_release(page); | |
4065 | btrfs_start_ordered_extent(inode, ordered, 1); | |
4066 | btrfs_put_ordered_extent(ordered); | |
4067 | goto again; | |
4068 | } | |
4069 | set_page_extent_mapped(page); | |
4070 | ||
1a40e23b ZY |
4071 | if (i == first_index) |
4072 | set_extent_bits(io_tree, page_start, page_end, | |
4073 | EXTENT_BOUNDARY, GFP_NOFS); | |
1f80e4db | 4074 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
1a40e23b | 4075 | |
a061fc8d | 4076 | set_page_dirty(page); |
1a40e23b | 4077 | total_dirty++; |
edbd8d4e | 4078 | |
d1310b2e | 4079 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
4080 | unlock_page(page); |
4081 | page_cache_release(page); | |
4082 | } | |
4083 | ||
4084 | out_unlock: | |
ec44a35c | 4085 | kfree(ra); |
edbd8d4e | 4086 | mutex_unlock(&inode->i_mutex); |
1a40e23b ZY |
4087 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
4088 | return ret; | |
edbd8d4e CM |
4089 | } |
4090 | ||
d397712b | 4091 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
1a40e23b ZY |
4092 | struct btrfs_key *extent_key, |
4093 | u64 offset) | |
4094 | { | |
4095 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
4096 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; | |
4097 | struct extent_map *em; | |
6643558d YZ |
4098 | u64 start = extent_key->objectid - offset; |
4099 | u64 end = start + extent_key->offset - 1; | |
bf4ef679 | 4100 | |
1a40e23b ZY |
4101 | em = alloc_extent_map(GFP_NOFS); |
4102 | BUG_ON(!em || IS_ERR(em)); | |
bf4ef679 | 4103 | |
6643558d | 4104 | em->start = start; |
1a40e23b | 4105 | em->len = extent_key->offset; |
c8b97818 | 4106 | em->block_len = extent_key->offset; |
1a40e23b ZY |
4107 | em->block_start = extent_key->objectid; |
4108 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
4109 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
4110 | ||
4111 | /* setup extent map to cheat btrfs_readpage */ | |
6643558d | 4112 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
1a40e23b ZY |
4113 | while (1) { |
4114 | int ret; | |
4115 | spin_lock(&em_tree->lock); | |
4116 | ret = add_extent_mapping(em_tree, em); | |
4117 | spin_unlock(&em_tree->lock); | |
4118 | if (ret != -EEXIST) { | |
4119 | free_extent_map(em); | |
bf4ef679 CM |
4120 | break; |
4121 | } | |
6643558d | 4122 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
bf4ef679 | 4123 | } |
6643558d | 4124 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
bf4ef679 | 4125 | |
6643558d | 4126 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
1a40e23b | 4127 | } |
edbd8d4e | 4128 | |
1a40e23b ZY |
4129 | struct btrfs_ref_path { |
4130 | u64 extent_start; | |
4131 | u64 nodes[BTRFS_MAX_LEVEL]; | |
4132 | u64 root_objectid; | |
4133 | u64 root_generation; | |
4134 | u64 owner_objectid; | |
1a40e23b ZY |
4135 | u32 num_refs; |
4136 | int lowest_level; | |
4137 | int current_level; | |
f82d02d9 YZ |
4138 | int shared_level; |
4139 | ||
4140 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; | |
4141 | u64 new_nodes[BTRFS_MAX_LEVEL]; | |
1a40e23b | 4142 | }; |
7d9eb12c | 4143 | |
1a40e23b | 4144 | struct disk_extent { |
c8b97818 | 4145 | u64 ram_bytes; |
1a40e23b ZY |
4146 | u64 disk_bytenr; |
4147 | u64 disk_num_bytes; | |
4148 | u64 offset; | |
4149 | u64 num_bytes; | |
c8b97818 CM |
4150 | u8 compression; |
4151 | u8 encryption; | |
4152 | u16 other_encoding; | |
1a40e23b | 4153 | }; |
4313b399 | 4154 | |
1a40e23b ZY |
4155 | static int is_cowonly_root(u64 root_objectid) |
4156 | { | |
4157 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
4158 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
4159 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
4160 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
0403e47e YZ |
4161 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
4162 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1a40e23b ZY |
4163 | return 1; |
4164 | return 0; | |
4165 | } | |
edbd8d4e | 4166 | |
d397712b | 4167 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4168 | struct btrfs_root *extent_root, |
4169 | struct btrfs_ref_path *ref_path, | |
4170 | int first_time) | |
4171 | { | |
4172 | struct extent_buffer *leaf; | |
4173 | struct btrfs_path *path; | |
4174 | struct btrfs_extent_ref *ref; | |
4175 | struct btrfs_key key; | |
4176 | struct btrfs_key found_key; | |
4177 | u64 bytenr; | |
4178 | u32 nritems; | |
4179 | int level; | |
4180 | int ret = 1; | |
edbd8d4e | 4181 | |
1a40e23b ZY |
4182 | path = btrfs_alloc_path(); |
4183 | if (!path) | |
4184 | return -ENOMEM; | |
bf4ef679 | 4185 | |
1a40e23b ZY |
4186 | if (first_time) { |
4187 | ref_path->lowest_level = -1; | |
4188 | ref_path->current_level = -1; | |
f82d02d9 | 4189 | ref_path->shared_level = -1; |
1a40e23b ZY |
4190 | goto walk_up; |
4191 | } | |
4192 | walk_down: | |
4193 | level = ref_path->current_level - 1; | |
4194 | while (level >= -1) { | |
4195 | u64 parent; | |
4196 | if (level < ref_path->lowest_level) | |
4197 | break; | |
bf4ef679 | 4198 | |
d397712b | 4199 | if (level >= 0) |
1a40e23b | 4200 | bytenr = ref_path->nodes[level]; |
d397712b | 4201 | else |
1a40e23b | 4202 | bytenr = ref_path->extent_start; |
1a40e23b | 4203 | BUG_ON(bytenr == 0); |
bf4ef679 | 4204 | |
1a40e23b ZY |
4205 | parent = ref_path->nodes[level + 1]; |
4206 | ref_path->nodes[level + 1] = 0; | |
4207 | ref_path->current_level = level; | |
4208 | BUG_ON(parent == 0); | |
0ef3e66b | 4209 | |
1a40e23b ZY |
4210 | key.objectid = bytenr; |
4211 | key.offset = parent + 1; | |
4212 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 4213 | |
1a40e23b ZY |
4214 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
4215 | if (ret < 0) | |
edbd8d4e | 4216 | goto out; |
1a40e23b | 4217 | BUG_ON(ret == 0); |
7d9eb12c | 4218 | |
1a40e23b ZY |
4219 | leaf = path->nodes[0]; |
4220 | nritems = btrfs_header_nritems(leaf); | |
4221 | if (path->slots[0] >= nritems) { | |
4222 | ret = btrfs_next_leaf(extent_root, path); | |
4223 | if (ret < 0) | |
4224 | goto out; | |
4225 | if (ret > 0) | |
4226 | goto next; | |
4227 | leaf = path->nodes[0]; | |
4228 | } | |
0ef3e66b | 4229 | |
1a40e23b ZY |
4230 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
4231 | if (found_key.objectid == bytenr && | |
f82d02d9 YZ |
4232 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
4233 | if (level < ref_path->shared_level) | |
4234 | ref_path->shared_level = level; | |
1a40e23b | 4235 | goto found; |
f82d02d9 | 4236 | } |
1a40e23b ZY |
4237 | next: |
4238 | level--; | |
4239 | btrfs_release_path(extent_root, path); | |
d899e052 | 4240 | cond_resched(); |
1a40e23b ZY |
4241 | } |
4242 | /* reached lowest level */ | |
4243 | ret = 1; | |
4244 | goto out; | |
4245 | walk_up: | |
4246 | level = ref_path->current_level; | |
4247 | while (level < BTRFS_MAX_LEVEL - 1) { | |
4248 | u64 ref_objectid; | |
d397712b CM |
4249 | |
4250 | if (level >= 0) | |
1a40e23b | 4251 | bytenr = ref_path->nodes[level]; |
d397712b | 4252 | else |
1a40e23b | 4253 | bytenr = ref_path->extent_start; |
d397712b | 4254 | |
1a40e23b | 4255 | BUG_ON(bytenr == 0); |
edbd8d4e | 4256 | |
1a40e23b ZY |
4257 | key.objectid = bytenr; |
4258 | key.offset = 0; | |
4259 | key.type = BTRFS_EXTENT_REF_KEY; | |
edbd8d4e | 4260 | |
1a40e23b ZY |
4261 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
4262 | if (ret < 0) | |
4263 | goto out; | |
edbd8d4e | 4264 | |
1a40e23b ZY |
4265 | leaf = path->nodes[0]; |
4266 | nritems = btrfs_header_nritems(leaf); | |
4267 | if (path->slots[0] >= nritems) { | |
4268 | ret = btrfs_next_leaf(extent_root, path); | |
4269 | if (ret < 0) | |
4270 | goto out; | |
4271 | if (ret > 0) { | |
4272 | /* the extent was freed by someone */ | |
4273 | if (ref_path->lowest_level == level) | |
4274 | goto out; | |
4275 | btrfs_release_path(extent_root, path); | |
4276 | goto walk_down; | |
4277 | } | |
4278 | leaf = path->nodes[0]; | |
4279 | } | |
edbd8d4e | 4280 | |
1a40e23b ZY |
4281 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
4282 | if (found_key.objectid != bytenr || | |
4283 | found_key.type != BTRFS_EXTENT_REF_KEY) { | |
4284 | /* the extent was freed by someone */ | |
4285 | if (ref_path->lowest_level == level) { | |
4286 | ret = 1; | |
4287 | goto out; | |
4288 | } | |
4289 | btrfs_release_path(extent_root, path); | |
4290 | goto walk_down; | |
4291 | } | |
4292 | found: | |
4293 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
4294 | struct btrfs_extent_ref); | |
4295 | ref_objectid = btrfs_ref_objectid(leaf, ref); | |
4296 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { | |
4297 | if (first_time) { | |
4298 | level = (int)ref_objectid; | |
4299 | BUG_ON(level >= BTRFS_MAX_LEVEL); | |
4300 | ref_path->lowest_level = level; | |
4301 | ref_path->current_level = level; | |
4302 | ref_path->nodes[level] = bytenr; | |
4303 | } else { | |
4304 | WARN_ON(ref_objectid != level); | |
4305 | } | |
4306 | } else { | |
4307 | WARN_ON(level != -1); | |
4308 | } | |
4309 | first_time = 0; | |
bf4ef679 | 4310 | |
1a40e23b ZY |
4311 | if (ref_path->lowest_level == level) { |
4312 | ref_path->owner_objectid = ref_objectid; | |
1a40e23b ZY |
4313 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
4314 | } | |
bf4ef679 | 4315 | |
7d9eb12c | 4316 | /* |
1a40e23b ZY |
4317 | * the block is tree root or the block isn't in reference |
4318 | * counted tree. | |
7d9eb12c | 4319 | */ |
1a40e23b ZY |
4320 | if (found_key.objectid == found_key.offset || |
4321 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { | |
4322 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4323 | ref_path->root_generation = | |
4324 | btrfs_ref_generation(leaf, ref); | |
4325 | if (level < 0) { | |
4326 | /* special reference from the tree log */ | |
4327 | ref_path->nodes[0] = found_key.offset; | |
4328 | ref_path->current_level = 0; | |
4329 | } | |
4330 | ret = 0; | |
4331 | goto out; | |
4332 | } | |
7d9eb12c | 4333 | |
1a40e23b ZY |
4334 | level++; |
4335 | BUG_ON(ref_path->nodes[level] != 0); | |
4336 | ref_path->nodes[level] = found_key.offset; | |
4337 | ref_path->current_level = level; | |
bf4ef679 | 4338 | |
1a40e23b ZY |
4339 | /* |
4340 | * the reference was created in the running transaction, | |
4341 | * no need to continue walking up. | |
4342 | */ | |
4343 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { | |
4344 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); | |
4345 | ref_path->root_generation = | |
4346 | btrfs_ref_generation(leaf, ref); | |
4347 | ret = 0; | |
4348 | goto out; | |
7d9eb12c CM |
4349 | } |
4350 | ||
1a40e23b | 4351 | btrfs_release_path(extent_root, path); |
d899e052 | 4352 | cond_resched(); |
7d9eb12c | 4353 | } |
1a40e23b ZY |
4354 | /* reached max tree level, but no tree root found. */ |
4355 | BUG(); | |
edbd8d4e | 4356 | out: |
1a40e23b ZY |
4357 | btrfs_free_path(path); |
4358 | return ret; | |
edbd8d4e CM |
4359 | } |
4360 | ||
1a40e23b ZY |
4361 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
4362 | struct btrfs_root *extent_root, | |
4363 | struct btrfs_ref_path *ref_path, | |
4364 | u64 extent_start) | |
a061fc8d | 4365 | { |
1a40e23b ZY |
4366 | memset(ref_path, 0, sizeof(*ref_path)); |
4367 | ref_path->extent_start = extent_start; | |
a061fc8d | 4368 | |
1a40e23b | 4369 | return __next_ref_path(trans, extent_root, ref_path, 1); |
a061fc8d CM |
4370 | } |
4371 | ||
1a40e23b ZY |
4372 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
4373 | struct btrfs_root *extent_root, | |
4374 | struct btrfs_ref_path *ref_path) | |
edbd8d4e | 4375 | { |
1a40e23b ZY |
4376 | return __next_ref_path(trans, extent_root, ref_path, 0); |
4377 | } | |
4378 | ||
d397712b | 4379 | static noinline int get_new_locations(struct inode *reloc_inode, |
1a40e23b ZY |
4380 | struct btrfs_key *extent_key, |
4381 | u64 offset, int no_fragment, | |
4382 | struct disk_extent **extents, | |
4383 | int *nr_extents) | |
4384 | { | |
4385 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
4386 | struct btrfs_path *path; | |
4387 | struct btrfs_file_extent_item *fi; | |
edbd8d4e | 4388 | struct extent_buffer *leaf; |
1a40e23b ZY |
4389 | struct disk_extent *exts = *extents; |
4390 | struct btrfs_key found_key; | |
4391 | u64 cur_pos; | |
4392 | u64 last_byte; | |
edbd8d4e | 4393 | u32 nritems; |
1a40e23b ZY |
4394 | int nr = 0; |
4395 | int max = *nr_extents; | |
4396 | int ret; | |
edbd8d4e | 4397 | |
1a40e23b ZY |
4398 | WARN_ON(!no_fragment && *extents); |
4399 | if (!exts) { | |
4400 | max = 1; | |
4401 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); | |
4402 | if (!exts) | |
4403 | return -ENOMEM; | |
a061fc8d | 4404 | } |
edbd8d4e | 4405 | |
1a40e23b ZY |
4406 | path = btrfs_alloc_path(); |
4407 | BUG_ON(!path); | |
edbd8d4e | 4408 | |
1a40e23b ZY |
4409 | cur_pos = extent_key->objectid - offset; |
4410 | last_byte = extent_key->objectid + extent_key->offset; | |
4411 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, | |
4412 | cur_pos, 0); | |
4413 | if (ret < 0) | |
4414 | goto out; | |
4415 | if (ret > 0) { | |
4416 | ret = -ENOENT; | |
4417 | goto out; | |
4418 | } | |
edbd8d4e | 4419 | |
1a40e23b | 4420 | while (1) { |
edbd8d4e CM |
4421 | leaf = path->nodes[0]; |
4422 | nritems = btrfs_header_nritems(leaf); | |
1a40e23b ZY |
4423 | if (path->slots[0] >= nritems) { |
4424 | ret = btrfs_next_leaf(root, path); | |
a061fc8d CM |
4425 | if (ret < 0) |
4426 | goto out; | |
1a40e23b ZY |
4427 | if (ret > 0) |
4428 | break; | |
bf4ef679 | 4429 | leaf = path->nodes[0]; |
a061fc8d | 4430 | } |
edbd8d4e CM |
4431 | |
4432 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b ZY |
4433 | if (found_key.offset != cur_pos || |
4434 | found_key.type != BTRFS_EXTENT_DATA_KEY || | |
4435 | found_key.objectid != reloc_inode->i_ino) | |
edbd8d4e CM |
4436 | break; |
4437 | ||
1a40e23b ZY |
4438 | fi = btrfs_item_ptr(leaf, path->slots[0], |
4439 | struct btrfs_file_extent_item); | |
4440 | if (btrfs_file_extent_type(leaf, fi) != | |
4441 | BTRFS_FILE_EXTENT_REG || | |
4442 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
edbd8d4e | 4443 | break; |
1a40e23b ZY |
4444 | |
4445 | if (nr == max) { | |
4446 | struct disk_extent *old = exts; | |
4447 | max *= 2; | |
4448 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); | |
4449 | memcpy(exts, old, sizeof(*exts) * nr); | |
4450 | if (old != *extents) | |
4451 | kfree(old); | |
a061fc8d | 4452 | } |
edbd8d4e | 4453 | |
1a40e23b ZY |
4454 | exts[nr].disk_bytenr = |
4455 | btrfs_file_extent_disk_bytenr(leaf, fi); | |
4456 | exts[nr].disk_num_bytes = | |
4457 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4458 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); | |
4459 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
c8b97818 CM |
4460 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
4461 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); | |
4462 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); | |
4463 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, | |
4464 | fi); | |
d899e052 YZ |
4465 | BUG_ON(exts[nr].offset > 0); |
4466 | BUG_ON(exts[nr].compression || exts[nr].encryption); | |
4467 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); | |
edbd8d4e | 4468 | |
1a40e23b ZY |
4469 | cur_pos += exts[nr].num_bytes; |
4470 | nr++; | |
4471 | ||
4472 | if (cur_pos + offset >= last_byte) | |
4473 | break; | |
4474 | ||
4475 | if (no_fragment) { | |
4476 | ret = 1; | |
edbd8d4e | 4477 | goto out; |
1a40e23b ZY |
4478 | } |
4479 | path->slots[0]++; | |
4480 | } | |
4481 | ||
1f80e4db | 4482 | BUG_ON(cur_pos + offset > last_byte); |
1a40e23b ZY |
4483 | if (cur_pos + offset < last_byte) { |
4484 | ret = -ENOENT; | |
4485 | goto out; | |
edbd8d4e CM |
4486 | } |
4487 | ret = 0; | |
4488 | out: | |
1a40e23b ZY |
4489 | btrfs_free_path(path); |
4490 | if (ret) { | |
4491 | if (exts != *extents) | |
4492 | kfree(exts); | |
4493 | } else { | |
4494 | *extents = exts; | |
4495 | *nr_extents = nr; | |
4496 | } | |
4497 | return ret; | |
4498 | } | |
4499 | ||
d397712b | 4500 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4501 | struct btrfs_root *root, |
4502 | struct btrfs_path *path, | |
4503 | struct btrfs_key *extent_key, | |
4504 | struct btrfs_key *leaf_key, | |
4505 | struct btrfs_ref_path *ref_path, | |
4506 | struct disk_extent *new_extents, | |
4507 | int nr_extents) | |
4508 | { | |
4509 | struct extent_buffer *leaf; | |
4510 | struct btrfs_file_extent_item *fi; | |
4511 | struct inode *inode = NULL; | |
4512 | struct btrfs_key key; | |
4513 | u64 lock_start = 0; | |
4514 | u64 lock_end = 0; | |
4515 | u64 num_bytes; | |
4516 | u64 ext_offset; | |
86288a19 | 4517 | u64 search_end = (u64)-1; |
1a40e23b | 4518 | u32 nritems; |
3bb1a1bc | 4519 | int nr_scaned = 0; |
1a40e23b | 4520 | int extent_locked = 0; |
d899e052 | 4521 | int extent_type; |
1a40e23b ZY |
4522 | int ret; |
4523 | ||
3bb1a1bc | 4524 | memcpy(&key, leaf_key, sizeof(key)); |
1a40e23b | 4525 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
3bb1a1bc YZ |
4526 | if (key.objectid < ref_path->owner_objectid || |
4527 | (key.objectid == ref_path->owner_objectid && | |
4528 | key.type < BTRFS_EXTENT_DATA_KEY)) { | |
4529 | key.objectid = ref_path->owner_objectid; | |
4530 | key.type = BTRFS_EXTENT_DATA_KEY; | |
4531 | key.offset = 0; | |
4532 | } | |
1a40e23b ZY |
4533 | } |
4534 | ||
4535 | while (1) { | |
4536 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
4537 | if (ret < 0) | |
4538 | goto out; | |
4539 | ||
4540 | leaf = path->nodes[0]; | |
4541 | nritems = btrfs_header_nritems(leaf); | |
4542 | next: | |
4543 | if (extent_locked && ret > 0) { | |
4544 | /* | |
4545 | * the file extent item was modified by someone | |
4546 | * before the extent got locked. | |
4547 | */ | |
1a40e23b ZY |
4548 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4549 | lock_end, GFP_NOFS); | |
4550 | extent_locked = 0; | |
4551 | } | |
4552 | ||
4553 | if (path->slots[0] >= nritems) { | |
3bb1a1bc | 4554 | if (++nr_scaned > 2) |
1a40e23b ZY |
4555 | break; |
4556 | ||
4557 | BUG_ON(extent_locked); | |
4558 | ret = btrfs_next_leaf(root, path); | |
4559 | if (ret < 0) | |
4560 | goto out; | |
4561 | if (ret > 0) | |
4562 | break; | |
4563 | leaf = path->nodes[0]; | |
4564 | nritems = btrfs_header_nritems(leaf); | |
4565 | } | |
4566 | ||
4567 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
4568 | ||
4569 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { | |
4570 | if ((key.objectid > ref_path->owner_objectid) || | |
4571 | (key.objectid == ref_path->owner_objectid && | |
4572 | key.type > BTRFS_EXTENT_DATA_KEY) || | |
86288a19 | 4573 | key.offset >= search_end) |
1a40e23b ZY |
4574 | break; |
4575 | } | |
4576 | ||
4577 | if (inode && key.objectid != inode->i_ino) { | |
4578 | BUG_ON(extent_locked); | |
4579 | btrfs_release_path(root, path); | |
4580 | mutex_unlock(&inode->i_mutex); | |
4581 | iput(inode); | |
4582 | inode = NULL; | |
4583 | continue; | |
4584 | } | |
4585 | ||
4586 | if (key.type != BTRFS_EXTENT_DATA_KEY) { | |
4587 | path->slots[0]++; | |
4588 | ret = 1; | |
4589 | goto next; | |
4590 | } | |
4591 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4592 | struct btrfs_file_extent_item); | |
d899e052 YZ |
4593 | extent_type = btrfs_file_extent_type(leaf, fi); |
4594 | if ((extent_type != BTRFS_FILE_EXTENT_REG && | |
4595 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || | |
1a40e23b ZY |
4596 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
4597 | extent_key->objectid)) { | |
4598 | path->slots[0]++; | |
4599 | ret = 1; | |
4600 | goto next; | |
4601 | } | |
4602 | ||
4603 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4604 | ext_offset = btrfs_file_extent_offset(leaf, fi); | |
4605 | ||
86288a19 YZ |
4606 | if (search_end == (u64)-1) { |
4607 | search_end = key.offset - ext_offset + | |
4608 | btrfs_file_extent_ram_bytes(leaf, fi); | |
4609 | } | |
1a40e23b ZY |
4610 | |
4611 | if (!extent_locked) { | |
4612 | lock_start = key.offset; | |
4613 | lock_end = lock_start + num_bytes - 1; | |
4614 | } else { | |
6643558d YZ |
4615 | if (lock_start > key.offset || |
4616 | lock_end + 1 < key.offset + num_bytes) { | |
4617 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4618 | lock_start, lock_end, GFP_NOFS); | |
4619 | extent_locked = 0; | |
4620 | } | |
1a40e23b ZY |
4621 | } |
4622 | ||
4623 | if (!inode) { | |
4624 | btrfs_release_path(root, path); | |
4625 | ||
4626 | inode = btrfs_iget_locked(root->fs_info->sb, | |
4627 | key.objectid, root); | |
4628 | if (inode->i_state & I_NEW) { | |
4629 | BTRFS_I(inode)->root = root; | |
4630 | BTRFS_I(inode)->location.objectid = | |
4631 | key.objectid; | |
4632 | BTRFS_I(inode)->location.type = | |
4633 | BTRFS_INODE_ITEM_KEY; | |
4634 | BTRFS_I(inode)->location.offset = 0; | |
4635 | btrfs_read_locked_inode(inode); | |
4636 | unlock_new_inode(inode); | |
4637 | } | |
4638 | /* | |
4639 | * some code call btrfs_commit_transaction while | |
4640 | * holding the i_mutex, so we can't use mutex_lock | |
4641 | * here. | |
4642 | */ | |
4643 | if (is_bad_inode(inode) || | |
4644 | !mutex_trylock(&inode->i_mutex)) { | |
4645 | iput(inode); | |
4646 | inode = NULL; | |
4647 | key.offset = (u64)-1; | |
4648 | goto skip; | |
4649 | } | |
4650 | } | |
4651 | ||
4652 | if (!extent_locked) { | |
4653 | struct btrfs_ordered_extent *ordered; | |
4654 | ||
4655 | btrfs_release_path(root, path); | |
4656 | ||
4657 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, | |
4658 | lock_end, GFP_NOFS); | |
4659 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
4660 | lock_end); | |
4661 | if (ordered && | |
4662 | ordered->file_offset <= lock_end && | |
4663 | ordered->file_offset + ordered->len > lock_start) { | |
4664 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
4665 | lock_start, lock_end, GFP_NOFS); | |
4666 | btrfs_start_ordered_extent(inode, ordered, 1); | |
4667 | btrfs_put_ordered_extent(ordered); | |
4668 | key.offset += num_bytes; | |
4669 | goto skip; | |
4670 | } | |
4671 | if (ordered) | |
4672 | btrfs_put_ordered_extent(ordered); | |
4673 | ||
1a40e23b ZY |
4674 | extent_locked = 1; |
4675 | continue; | |
4676 | } | |
4677 | ||
4678 | if (nr_extents == 1) { | |
4679 | /* update extent pointer in place */ | |
1a40e23b ZY |
4680 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4681 | new_extents[0].disk_bytenr); | |
4682 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4683 | new_extents[0].disk_num_bytes); | |
1a40e23b ZY |
4684 | btrfs_mark_buffer_dirty(leaf); |
4685 | ||
4686 | btrfs_drop_extent_cache(inode, key.offset, | |
4687 | key.offset + num_bytes - 1, 0); | |
4688 | ||
4689 | ret = btrfs_inc_extent_ref(trans, root, | |
4690 | new_extents[0].disk_bytenr, | |
4691 | new_extents[0].disk_num_bytes, | |
4692 | leaf->start, | |
4693 | root->root_key.objectid, | |
4694 | trans->transid, | |
3bb1a1bc | 4695 | key.objectid); |
1a40e23b ZY |
4696 | BUG_ON(ret); |
4697 | ||
4698 | ret = btrfs_free_extent(trans, root, | |
4699 | extent_key->objectid, | |
4700 | extent_key->offset, | |
4701 | leaf->start, | |
4702 | btrfs_header_owner(leaf), | |
4703 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4704 | key.objectid, 0); |
1a40e23b ZY |
4705 | BUG_ON(ret); |
4706 | ||
4707 | btrfs_release_path(root, path); | |
4708 | key.offset += num_bytes; | |
4709 | } else { | |
d899e052 YZ |
4710 | BUG_ON(1); |
4711 | #if 0 | |
1a40e23b ZY |
4712 | u64 alloc_hint; |
4713 | u64 extent_len; | |
4714 | int i; | |
4715 | /* | |
4716 | * drop old extent pointer at first, then insert the | |
4717 | * new pointers one bye one | |
4718 | */ | |
4719 | btrfs_release_path(root, path); | |
4720 | ret = btrfs_drop_extents(trans, root, inode, key.offset, | |
4721 | key.offset + num_bytes, | |
4722 | key.offset, &alloc_hint); | |
4723 | BUG_ON(ret); | |
4724 | ||
4725 | for (i = 0; i < nr_extents; i++) { | |
4726 | if (ext_offset >= new_extents[i].num_bytes) { | |
4727 | ext_offset -= new_extents[i].num_bytes; | |
4728 | continue; | |
4729 | } | |
4730 | extent_len = min(new_extents[i].num_bytes - | |
4731 | ext_offset, num_bytes); | |
4732 | ||
4733 | ret = btrfs_insert_empty_item(trans, root, | |
4734 | path, &key, | |
4735 | sizeof(*fi)); | |
4736 | BUG_ON(ret); | |
4737 | ||
4738 | leaf = path->nodes[0]; | |
4739 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
4740 | struct btrfs_file_extent_item); | |
4741 | btrfs_set_file_extent_generation(leaf, fi, | |
4742 | trans->transid); | |
4743 | btrfs_set_file_extent_type(leaf, fi, | |
4744 | BTRFS_FILE_EXTENT_REG); | |
4745 | btrfs_set_file_extent_disk_bytenr(leaf, fi, | |
4746 | new_extents[i].disk_bytenr); | |
4747 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4748 | new_extents[i].disk_num_bytes); | |
c8b97818 CM |
4749 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
4750 | new_extents[i].ram_bytes); | |
4751 | ||
4752 | btrfs_set_file_extent_compression(leaf, fi, | |
4753 | new_extents[i].compression); | |
4754 | btrfs_set_file_extent_encryption(leaf, fi, | |
4755 | new_extents[i].encryption); | |
4756 | btrfs_set_file_extent_other_encoding(leaf, fi, | |
4757 | new_extents[i].other_encoding); | |
4758 | ||
1a40e23b ZY |
4759 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4760 | extent_len); | |
4761 | ext_offset += new_extents[i].offset; | |
4762 | btrfs_set_file_extent_offset(leaf, fi, | |
4763 | ext_offset); | |
4764 | btrfs_mark_buffer_dirty(leaf); | |
4765 | ||
4766 | btrfs_drop_extent_cache(inode, key.offset, | |
4767 | key.offset + extent_len - 1, 0); | |
4768 | ||
4769 | ret = btrfs_inc_extent_ref(trans, root, | |
4770 | new_extents[i].disk_bytenr, | |
4771 | new_extents[i].disk_num_bytes, | |
4772 | leaf->start, | |
4773 | root->root_key.objectid, | |
3bb1a1bc | 4774 | trans->transid, key.objectid); |
1a40e23b ZY |
4775 | BUG_ON(ret); |
4776 | btrfs_release_path(root, path); | |
4777 | ||
a76a3cd4 | 4778 | inode_add_bytes(inode, extent_len); |
1a40e23b ZY |
4779 | |
4780 | ext_offset = 0; | |
4781 | num_bytes -= extent_len; | |
4782 | key.offset += extent_len; | |
4783 | ||
4784 | if (num_bytes == 0) | |
4785 | break; | |
4786 | } | |
4787 | BUG_ON(i >= nr_extents); | |
d899e052 | 4788 | #endif |
1a40e23b ZY |
4789 | } |
4790 | ||
4791 | if (extent_locked) { | |
1a40e23b ZY |
4792 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4793 | lock_end, GFP_NOFS); | |
4794 | extent_locked = 0; | |
4795 | } | |
4796 | skip: | |
4797 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && | |
86288a19 | 4798 | key.offset >= search_end) |
1a40e23b ZY |
4799 | break; |
4800 | ||
4801 | cond_resched(); | |
4802 | } | |
4803 | ret = 0; | |
4804 | out: | |
4805 | btrfs_release_path(root, path); | |
4806 | if (inode) { | |
4807 | mutex_unlock(&inode->i_mutex); | |
4808 | if (extent_locked) { | |
1a40e23b ZY |
4809 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
4810 | lock_end, GFP_NOFS); | |
4811 | } | |
4812 | iput(inode); | |
4813 | } | |
4814 | return ret; | |
4815 | } | |
4816 | ||
1a40e23b ZY |
4817 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
4818 | struct btrfs_root *root, | |
4819 | struct extent_buffer *buf, u64 orig_start) | |
4820 | { | |
4821 | int level; | |
4822 | int ret; | |
4823 | ||
4824 | BUG_ON(btrfs_header_generation(buf) != trans->transid); | |
4825 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
4826 | ||
4827 | level = btrfs_header_level(buf); | |
4828 | if (level == 0) { | |
4829 | struct btrfs_leaf_ref *ref; | |
4830 | struct btrfs_leaf_ref *orig_ref; | |
4831 | ||
4832 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); | |
4833 | if (!orig_ref) | |
4834 | return -ENOENT; | |
4835 | ||
4836 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); | |
4837 | if (!ref) { | |
4838 | btrfs_free_leaf_ref(root, orig_ref); | |
4839 | return -ENOMEM; | |
4840 | } | |
4841 | ||
4842 | ref->nritems = orig_ref->nritems; | |
4843 | memcpy(ref->extents, orig_ref->extents, | |
4844 | sizeof(ref->extents[0]) * ref->nritems); | |
4845 | ||
4846 | btrfs_free_leaf_ref(root, orig_ref); | |
4847 | ||
4848 | ref->root_gen = trans->transid; | |
4849 | ref->bytenr = buf->start; | |
4850 | ref->owner = btrfs_header_owner(buf); | |
4851 | ref->generation = btrfs_header_generation(buf); | |
4852 | ret = btrfs_add_leaf_ref(root, ref, 0); | |
4853 | WARN_ON(ret); | |
4854 | btrfs_free_leaf_ref(root, ref); | |
4855 | } | |
4856 | return 0; | |
4857 | } | |
4858 | ||
d397712b | 4859 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
1a40e23b ZY |
4860 | struct extent_buffer *leaf, |
4861 | struct btrfs_block_group_cache *group, | |
4862 | struct btrfs_root *target_root) | |
4863 | { | |
4864 | struct btrfs_key key; | |
4865 | struct inode *inode = NULL; | |
4866 | struct btrfs_file_extent_item *fi; | |
4867 | u64 num_bytes; | |
4868 | u64 skip_objectid = 0; | |
4869 | u32 nritems; | |
4870 | u32 i; | |
4871 | ||
4872 | nritems = btrfs_header_nritems(leaf); | |
4873 | for (i = 0; i < nritems; i++) { | |
4874 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4875 | if (key.objectid == skip_objectid || | |
4876 | key.type != BTRFS_EXTENT_DATA_KEY) | |
4877 | continue; | |
4878 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4879 | if (btrfs_file_extent_type(leaf, fi) == | |
4880 | BTRFS_FILE_EXTENT_INLINE) | |
4881 | continue; | |
4882 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) | |
4883 | continue; | |
4884 | if (!inode || inode->i_ino != key.objectid) { | |
4885 | iput(inode); | |
4886 | inode = btrfs_ilookup(target_root->fs_info->sb, | |
4887 | key.objectid, target_root, 1); | |
4888 | } | |
4889 | if (!inode) { | |
4890 | skip_objectid = key.objectid; | |
4891 | continue; | |
4892 | } | |
4893 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); | |
4894 | ||
4895 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, | |
4896 | key.offset + num_bytes - 1, GFP_NOFS); | |
1a40e23b ZY |
4897 | btrfs_drop_extent_cache(inode, key.offset, |
4898 | key.offset + num_bytes - 1, 1); | |
1a40e23b ZY |
4899 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
4900 | key.offset + num_bytes - 1, GFP_NOFS); | |
4901 | cond_resched(); | |
4902 | } | |
4903 | iput(inode); | |
4904 | return 0; | |
4905 | } | |
4906 | ||
d397712b | 4907 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
4908 | struct btrfs_root *root, |
4909 | struct extent_buffer *leaf, | |
4910 | struct btrfs_block_group_cache *group, | |
4911 | struct inode *reloc_inode) | |
4912 | { | |
4913 | struct btrfs_key key; | |
4914 | struct btrfs_key extent_key; | |
4915 | struct btrfs_file_extent_item *fi; | |
4916 | struct btrfs_leaf_ref *ref; | |
4917 | struct disk_extent *new_extent; | |
4918 | u64 bytenr; | |
4919 | u64 num_bytes; | |
4920 | u32 nritems; | |
4921 | u32 i; | |
4922 | int ext_index; | |
4923 | int nr_extent; | |
4924 | int ret; | |
4925 | ||
4926 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); | |
4927 | BUG_ON(!new_extent); | |
4928 | ||
4929 | ref = btrfs_lookup_leaf_ref(root, leaf->start); | |
4930 | BUG_ON(!ref); | |
4931 | ||
4932 | ext_index = -1; | |
4933 | nritems = btrfs_header_nritems(leaf); | |
4934 | for (i = 0; i < nritems; i++) { | |
4935 | btrfs_item_key_to_cpu(leaf, &key, i); | |
4936 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
4937 | continue; | |
4938 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
4939 | if (btrfs_file_extent_type(leaf, fi) == | |
4940 | BTRFS_FILE_EXTENT_INLINE) | |
4941 | continue; | |
4942 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
4943 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
4944 | if (bytenr == 0) | |
4945 | continue; | |
4946 | ||
4947 | ext_index++; | |
4948 | if (bytenr >= group->key.objectid + group->key.offset || | |
4949 | bytenr + num_bytes <= group->key.objectid) | |
4950 | continue; | |
4951 | ||
4952 | extent_key.objectid = bytenr; | |
4953 | extent_key.offset = num_bytes; | |
4954 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
4955 | nr_extent = 1; | |
4956 | ret = get_new_locations(reloc_inode, &extent_key, | |
4957 | group->key.objectid, 1, | |
4958 | &new_extent, &nr_extent); | |
4959 | if (ret > 0) | |
4960 | continue; | |
4961 | BUG_ON(ret < 0); | |
4962 | ||
4963 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); | |
4964 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); | |
4965 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; | |
4966 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; | |
4967 | ||
1a40e23b ZY |
4968 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
4969 | new_extent->disk_bytenr); | |
4970 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, | |
4971 | new_extent->disk_num_bytes); | |
1a40e23b ZY |
4972 | btrfs_mark_buffer_dirty(leaf); |
4973 | ||
4974 | ret = btrfs_inc_extent_ref(trans, root, | |
4975 | new_extent->disk_bytenr, | |
4976 | new_extent->disk_num_bytes, | |
4977 | leaf->start, | |
4978 | root->root_key.objectid, | |
3bb1a1bc | 4979 | trans->transid, key.objectid); |
1a40e23b ZY |
4980 | BUG_ON(ret); |
4981 | ret = btrfs_free_extent(trans, root, | |
4982 | bytenr, num_bytes, leaf->start, | |
4983 | btrfs_header_owner(leaf), | |
4984 | btrfs_header_generation(leaf), | |
3bb1a1bc | 4985 | key.objectid, 0); |
1a40e23b ZY |
4986 | BUG_ON(ret); |
4987 | cond_resched(); | |
4988 | } | |
4989 | kfree(new_extent); | |
4990 | BUG_ON(ext_index + 1 != ref->nritems); | |
4991 | btrfs_free_leaf_ref(root, ref); | |
4992 | return 0; | |
4993 | } | |
4994 | ||
f82d02d9 YZ |
4995 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
4996 | struct btrfs_root *root) | |
1a40e23b ZY |
4997 | { |
4998 | struct btrfs_root *reloc_root; | |
f82d02d9 | 4999 | int ret; |
1a40e23b ZY |
5000 | |
5001 | if (root->reloc_root) { | |
5002 | reloc_root = root->reloc_root; | |
5003 | root->reloc_root = NULL; | |
5004 | list_add(&reloc_root->dead_list, | |
5005 | &root->fs_info->dead_reloc_roots); | |
f82d02d9 YZ |
5006 | |
5007 | btrfs_set_root_bytenr(&reloc_root->root_item, | |
5008 | reloc_root->node->start); | |
5009 | btrfs_set_root_level(&root->root_item, | |
5010 | btrfs_header_level(reloc_root->node)); | |
5011 | memset(&reloc_root->root_item.drop_progress, 0, | |
5012 | sizeof(struct btrfs_disk_key)); | |
5013 | reloc_root->root_item.drop_level = 0; | |
5014 | ||
5015 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
5016 | &reloc_root->root_key, | |
5017 | &reloc_root->root_item); | |
5018 | BUG_ON(ret); | |
1a40e23b ZY |
5019 | } |
5020 | return 0; | |
5021 | } | |
5022 | ||
5023 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) | |
5024 | { | |
5025 | struct btrfs_trans_handle *trans; | |
5026 | struct btrfs_root *reloc_root; | |
5027 | struct btrfs_root *prev_root = NULL; | |
5028 | struct list_head dead_roots; | |
5029 | int ret; | |
5030 | unsigned long nr; | |
5031 | ||
5032 | INIT_LIST_HEAD(&dead_roots); | |
5033 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); | |
5034 | ||
5035 | while (!list_empty(&dead_roots)) { | |
5036 | reloc_root = list_entry(dead_roots.prev, | |
5037 | struct btrfs_root, dead_list); | |
5038 | list_del_init(&reloc_root->dead_list); | |
5039 | ||
5040 | BUG_ON(reloc_root->commit_root != NULL); | |
5041 | while (1) { | |
5042 | trans = btrfs_join_transaction(root, 1); | |
5043 | BUG_ON(!trans); | |
5044 | ||
5045 | mutex_lock(&root->fs_info->drop_mutex); | |
5046 | ret = btrfs_drop_snapshot(trans, reloc_root); | |
5047 | if (ret != -EAGAIN) | |
5048 | break; | |
5049 | mutex_unlock(&root->fs_info->drop_mutex); | |
5050 | ||
5051 | nr = trans->blocks_used; | |
5052 | ret = btrfs_end_transaction(trans, root); | |
5053 | BUG_ON(ret); | |
5054 | btrfs_btree_balance_dirty(root, nr); | |
5055 | } | |
5056 | ||
5057 | free_extent_buffer(reloc_root->node); | |
5058 | ||
5059 | ret = btrfs_del_root(trans, root->fs_info->tree_root, | |
5060 | &reloc_root->root_key); | |
5061 | BUG_ON(ret); | |
5062 | mutex_unlock(&root->fs_info->drop_mutex); | |
5063 | ||
5064 | nr = trans->blocks_used; | |
5065 | ret = btrfs_end_transaction(trans, root); | |
5066 | BUG_ON(ret); | |
5067 | btrfs_btree_balance_dirty(root, nr); | |
5068 | ||
5069 | kfree(prev_root); | |
5070 | prev_root = reloc_root; | |
5071 | } | |
5072 | if (prev_root) { | |
5073 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); | |
5074 | kfree(prev_root); | |
5075 | } | |
5076 | return 0; | |
5077 | } | |
5078 | ||
5079 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) | |
5080 | { | |
5081 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); | |
5082 | return 0; | |
5083 | } | |
5084 | ||
5085 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) | |
5086 | { | |
5087 | struct btrfs_root *reloc_root; | |
5088 | struct btrfs_trans_handle *trans; | |
5089 | struct btrfs_key location; | |
5090 | int found; | |
5091 | int ret; | |
5092 | ||
5093 | mutex_lock(&root->fs_info->tree_reloc_mutex); | |
5094 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); | |
5095 | BUG_ON(ret); | |
5096 | found = !list_empty(&root->fs_info->dead_reloc_roots); | |
5097 | mutex_unlock(&root->fs_info->tree_reloc_mutex); | |
5098 | ||
5099 | if (found) { | |
5100 | trans = btrfs_start_transaction(root, 1); | |
5101 | BUG_ON(!trans); | |
5102 | ret = btrfs_commit_transaction(trans, root); | |
5103 | BUG_ON(ret); | |
5104 | } | |
5105 | ||
5106 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
5107 | location.offset = (u64)-1; | |
5108 | location.type = BTRFS_ROOT_ITEM_KEY; | |
5109 | ||
5110 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
5111 | BUG_ON(!reloc_root); | |
5112 | btrfs_orphan_cleanup(reloc_root); | |
5113 | return 0; | |
5114 | } | |
5115 | ||
d397712b | 5116 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5117 | struct btrfs_root *root) |
5118 | { | |
5119 | struct btrfs_root *reloc_root; | |
5120 | struct extent_buffer *eb; | |
5121 | struct btrfs_root_item *root_item; | |
5122 | struct btrfs_key root_key; | |
5123 | int ret; | |
5124 | ||
5125 | BUG_ON(!root->ref_cows); | |
5126 | if (root->reloc_root) | |
5127 | return 0; | |
5128 | ||
5129 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); | |
5130 | BUG_ON(!root_item); | |
5131 | ||
5132 | ret = btrfs_copy_root(trans, root, root->commit_root, | |
5133 | &eb, BTRFS_TREE_RELOC_OBJECTID); | |
5134 | BUG_ON(ret); | |
5135 | ||
5136 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
5137 | root_key.offset = root->root_key.objectid; | |
5138 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5139 | ||
5140 | memcpy(root_item, &root->root_item, sizeof(root_item)); | |
5141 | btrfs_set_root_refs(root_item, 0); | |
5142 | btrfs_set_root_bytenr(root_item, eb->start); | |
5143 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
84234f3a | 5144 | btrfs_set_root_generation(root_item, trans->transid); |
1a40e23b ZY |
5145 | |
5146 | btrfs_tree_unlock(eb); | |
5147 | free_extent_buffer(eb); | |
5148 | ||
5149 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
5150 | &root_key, root_item); | |
5151 | BUG_ON(ret); | |
5152 | kfree(root_item); | |
5153 | ||
5154 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, | |
5155 | &root_key); | |
5156 | BUG_ON(!reloc_root); | |
5157 | reloc_root->last_trans = trans->transid; | |
5158 | reloc_root->commit_root = NULL; | |
5159 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; | |
5160 | ||
5161 | root->reloc_root = reloc_root; | |
5162 | return 0; | |
5163 | } | |
5164 | ||
5165 | /* | |
5166 | * Core function of space balance. | |
5167 | * | |
5168 | * The idea is using reloc trees to relocate tree blocks in reference | |
f82d02d9 YZ |
5169 | * counted roots. There is one reloc tree for each subvol, and all |
5170 | * reloc trees share same root key objectid. Reloc trees are snapshots | |
5171 | * of the latest committed roots of subvols (root->commit_root). | |
5172 | * | |
5173 | * To relocate a tree block referenced by a subvol, there are two steps. | |
5174 | * COW the block through subvol's reloc tree, then update block pointer | |
5175 | * in the subvol to point to the new block. Since all reloc trees share | |
5176 | * same root key objectid, doing special handing for tree blocks owned | |
5177 | * by them is easy. Once a tree block has been COWed in one reloc tree, | |
5178 | * we can use the resulting new block directly when the same block is | |
5179 | * required to COW again through other reloc trees. By this way, relocated | |
5180 | * tree blocks are shared between reloc trees, so they are also shared | |
5181 | * between subvols. | |
1a40e23b | 5182 | */ |
d397712b | 5183 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5184 | struct btrfs_root *root, |
5185 | struct btrfs_path *path, | |
5186 | struct btrfs_key *first_key, | |
5187 | struct btrfs_ref_path *ref_path, | |
5188 | struct btrfs_block_group_cache *group, | |
5189 | struct inode *reloc_inode) | |
5190 | { | |
5191 | struct btrfs_root *reloc_root; | |
5192 | struct extent_buffer *eb = NULL; | |
5193 | struct btrfs_key *keys; | |
5194 | u64 *nodes; | |
5195 | int level; | |
f82d02d9 | 5196 | int shared_level; |
1a40e23b | 5197 | int lowest_level = 0; |
1a40e23b ZY |
5198 | int ret; |
5199 | ||
5200 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) | |
5201 | lowest_level = ref_path->owner_objectid; | |
5202 | ||
f82d02d9 | 5203 | if (!root->ref_cows) { |
1a40e23b ZY |
5204 | path->lowest_level = lowest_level; |
5205 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); | |
5206 | BUG_ON(ret < 0); | |
5207 | path->lowest_level = 0; | |
5208 | btrfs_release_path(root, path); | |
5209 | return 0; | |
5210 | } | |
5211 | ||
1a40e23b ZY |
5212 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
5213 | ret = init_reloc_tree(trans, root); | |
5214 | BUG_ON(ret); | |
5215 | reloc_root = root->reloc_root; | |
5216 | ||
f82d02d9 YZ |
5217 | shared_level = ref_path->shared_level; |
5218 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; | |
1a40e23b | 5219 | |
f82d02d9 YZ |
5220 | keys = ref_path->node_keys; |
5221 | nodes = ref_path->new_nodes; | |
5222 | memset(&keys[shared_level + 1], 0, | |
5223 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
5224 | memset(&nodes[shared_level + 1], 0, | |
5225 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); | |
1a40e23b | 5226 | |
f82d02d9 YZ |
5227 | if (nodes[lowest_level] == 0) { |
5228 | path->lowest_level = lowest_level; | |
5229 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, | |
5230 | 0, 1); | |
5231 | BUG_ON(ret); | |
5232 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { | |
5233 | eb = path->nodes[level]; | |
5234 | if (!eb || eb == reloc_root->node) | |
5235 | break; | |
5236 | nodes[level] = eb->start; | |
5237 | if (level == 0) | |
5238 | btrfs_item_key_to_cpu(eb, &keys[level], 0); | |
5239 | else | |
5240 | btrfs_node_key_to_cpu(eb, &keys[level], 0); | |
5241 | } | |
2b82032c YZ |
5242 | if (nodes[0] && |
5243 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
5244 | eb = path->nodes[0]; |
5245 | ret = replace_extents_in_leaf(trans, reloc_root, eb, | |
5246 | group, reloc_inode); | |
5247 | BUG_ON(ret); | |
5248 | } | |
5249 | btrfs_release_path(reloc_root, path); | |
5250 | } else { | |
1a40e23b | 5251 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
f82d02d9 | 5252 | lowest_level); |
1a40e23b ZY |
5253 | BUG_ON(ret); |
5254 | } | |
5255 | ||
1a40e23b ZY |
5256 | /* |
5257 | * replace tree blocks in the fs tree with tree blocks in | |
5258 | * the reloc tree. | |
5259 | */ | |
5260 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); | |
5261 | BUG_ON(ret < 0); | |
5262 | ||
5263 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
f82d02d9 YZ |
5264 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
5265 | 0, 0); | |
5266 | BUG_ON(ret); | |
5267 | extent_buffer_get(path->nodes[0]); | |
5268 | eb = path->nodes[0]; | |
5269 | btrfs_release_path(reloc_root, path); | |
1a40e23b ZY |
5270 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
5271 | BUG_ON(ret); | |
5272 | free_extent_buffer(eb); | |
5273 | } | |
1a40e23b | 5274 | |
f82d02d9 | 5275 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
1a40e23b | 5276 | path->lowest_level = 0; |
1a40e23b ZY |
5277 | return 0; |
5278 | } | |
5279 | ||
d397712b | 5280 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5281 | struct btrfs_root *root, |
5282 | struct btrfs_path *path, | |
5283 | struct btrfs_key *first_key, | |
5284 | struct btrfs_ref_path *ref_path) | |
5285 | { | |
5286 | int ret; | |
1a40e23b ZY |
5287 | |
5288 | ret = relocate_one_path(trans, root, path, first_key, | |
5289 | ref_path, NULL, NULL); | |
5290 | BUG_ON(ret); | |
5291 | ||
5292 | if (root == root->fs_info->extent_root) | |
5293 | btrfs_extent_post_op(trans, root); | |
1a40e23b ZY |
5294 | |
5295 | return 0; | |
5296 | } | |
5297 | ||
d397712b | 5298 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
1a40e23b ZY |
5299 | struct btrfs_root *extent_root, |
5300 | struct btrfs_path *path, | |
5301 | struct btrfs_key *extent_key) | |
5302 | { | |
5303 | int ret; | |
5304 | ||
1a40e23b ZY |
5305 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
5306 | if (ret) | |
5307 | goto out; | |
5308 | ret = btrfs_del_item(trans, extent_root, path); | |
5309 | out: | |
5310 | btrfs_release_path(extent_root, path); | |
1a40e23b ZY |
5311 | return ret; |
5312 | } | |
5313 | ||
d397712b | 5314 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
5315 | struct btrfs_ref_path *ref_path) |
5316 | { | |
5317 | struct btrfs_key root_key; | |
5318 | ||
5319 | root_key.objectid = ref_path->root_objectid; | |
5320 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5321 | if (is_cowonly_root(ref_path->root_objectid)) | |
5322 | root_key.offset = 0; | |
5323 | else | |
5324 | root_key.offset = (u64)-1; | |
5325 | ||
5326 | return btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5327 | } | |
5328 | ||
d397712b | 5329 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
1a40e23b ZY |
5330 | struct btrfs_path *path, |
5331 | struct btrfs_key *extent_key, | |
5332 | struct btrfs_block_group_cache *group, | |
5333 | struct inode *reloc_inode, int pass) | |
5334 | { | |
5335 | struct btrfs_trans_handle *trans; | |
5336 | struct btrfs_root *found_root; | |
5337 | struct btrfs_ref_path *ref_path = NULL; | |
5338 | struct disk_extent *new_extents = NULL; | |
5339 | int nr_extents = 0; | |
5340 | int loops; | |
5341 | int ret; | |
5342 | int level; | |
5343 | struct btrfs_key first_key; | |
5344 | u64 prev_block = 0; | |
5345 | ||
1a40e23b ZY |
5346 | |
5347 | trans = btrfs_start_transaction(extent_root, 1); | |
5348 | BUG_ON(!trans); | |
5349 | ||
5350 | if (extent_key->objectid == 0) { | |
5351 | ret = del_extent_zero(trans, extent_root, path, extent_key); | |
5352 | goto out; | |
5353 | } | |
5354 | ||
5355 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); | |
5356 | if (!ref_path) { | |
d397712b CM |
5357 | ret = -ENOMEM; |
5358 | goto out; | |
1a40e23b ZY |
5359 | } |
5360 | ||
5361 | for (loops = 0; ; loops++) { | |
5362 | if (loops == 0) { | |
5363 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, | |
5364 | extent_key->objectid); | |
5365 | } else { | |
5366 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); | |
5367 | } | |
5368 | if (ret < 0) | |
5369 | goto out; | |
5370 | if (ret > 0) | |
5371 | break; | |
5372 | ||
5373 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
5374 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) | |
5375 | continue; | |
5376 | ||
5377 | found_root = read_ref_root(extent_root->fs_info, ref_path); | |
5378 | BUG_ON(!found_root); | |
5379 | /* | |
5380 | * for reference counted tree, only process reference paths | |
5381 | * rooted at the latest committed root. | |
5382 | */ | |
5383 | if (found_root->ref_cows && | |
5384 | ref_path->root_generation != found_root->root_key.offset) | |
5385 | continue; | |
5386 | ||
5387 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
5388 | if (pass == 0) { | |
5389 | /* | |
5390 | * copy data extents to new locations | |
5391 | */ | |
5392 | u64 group_start = group->key.objectid; | |
5393 | ret = relocate_data_extent(reloc_inode, | |
5394 | extent_key, | |
5395 | group_start); | |
5396 | if (ret < 0) | |
5397 | goto out; | |
5398 | break; | |
5399 | } | |
5400 | level = 0; | |
5401 | } else { | |
5402 | level = ref_path->owner_objectid; | |
5403 | } | |
5404 | ||
5405 | if (prev_block != ref_path->nodes[level]) { | |
5406 | struct extent_buffer *eb; | |
5407 | u64 block_start = ref_path->nodes[level]; | |
5408 | u64 block_size = btrfs_level_size(found_root, level); | |
5409 | ||
5410 | eb = read_tree_block(found_root, block_start, | |
5411 | block_size, 0); | |
5412 | btrfs_tree_lock(eb); | |
5413 | BUG_ON(level != btrfs_header_level(eb)); | |
5414 | ||
5415 | if (level == 0) | |
5416 | btrfs_item_key_to_cpu(eb, &first_key, 0); | |
5417 | else | |
5418 | btrfs_node_key_to_cpu(eb, &first_key, 0); | |
5419 | ||
5420 | btrfs_tree_unlock(eb); | |
5421 | free_extent_buffer(eb); | |
5422 | prev_block = block_start; | |
5423 | } | |
5424 | ||
e4404d6e YZ |
5425 | btrfs_record_root_in_trans(found_root); |
5426 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
5427 | /* | |
5428 | * try to update data extent references while | |
5429 | * keeping metadata shared between snapshots. | |
5430 | */ | |
5431 | if (pass == 1) { | |
5432 | ret = relocate_one_path(trans, found_root, | |
5433 | path, &first_key, ref_path, | |
5434 | group, reloc_inode); | |
5435 | if (ret < 0) | |
5436 | goto out; | |
5437 | continue; | |
5438 | } | |
1a40e23b ZY |
5439 | /* |
5440 | * use fallback method to process the remaining | |
5441 | * references. | |
5442 | */ | |
5443 | if (!new_extents) { | |
5444 | u64 group_start = group->key.objectid; | |
d899e052 YZ |
5445 | new_extents = kmalloc(sizeof(*new_extents), |
5446 | GFP_NOFS); | |
5447 | nr_extents = 1; | |
1a40e23b ZY |
5448 | ret = get_new_locations(reloc_inode, |
5449 | extent_key, | |
d899e052 | 5450 | group_start, 1, |
1a40e23b ZY |
5451 | &new_extents, |
5452 | &nr_extents); | |
d899e052 | 5453 | if (ret) |
1a40e23b ZY |
5454 | goto out; |
5455 | } | |
1a40e23b ZY |
5456 | ret = replace_one_extent(trans, found_root, |
5457 | path, extent_key, | |
5458 | &first_key, ref_path, | |
5459 | new_extents, nr_extents); | |
e4404d6e | 5460 | } else { |
1a40e23b ZY |
5461 | ret = relocate_tree_block(trans, found_root, path, |
5462 | &first_key, ref_path); | |
1a40e23b ZY |
5463 | } |
5464 | if (ret < 0) | |
5465 | goto out; | |
5466 | } | |
5467 | ret = 0; | |
5468 | out: | |
5469 | btrfs_end_transaction(trans, extent_root); | |
5470 | kfree(new_extents); | |
5471 | kfree(ref_path); | |
1a40e23b ZY |
5472 | return ret; |
5473 | } | |
5474 | ||
ec44a35c CM |
5475 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
5476 | { | |
5477 | u64 num_devices; | |
5478 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
5479 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
5480 | ||
2b82032c | 5481 | num_devices = root->fs_info->fs_devices->rw_devices; |
ec44a35c CM |
5482 | if (num_devices == 1) { |
5483 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5484 | stripped = flags & ~stripped; | |
5485 | ||
5486 | /* turn raid0 into single device chunks */ | |
5487 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
5488 | return stripped; | |
5489 | ||
5490 | /* turn mirroring into duplication */ | |
5491 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
5492 | BTRFS_BLOCK_GROUP_RAID10)) | |
5493 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
5494 | return flags; | |
5495 | } else { | |
5496 | /* they already had raid on here, just return */ | |
ec44a35c CM |
5497 | if (flags & stripped) |
5498 | return flags; | |
5499 | ||
5500 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
5501 | stripped = flags & ~stripped; | |
5502 | ||
5503 | /* switch duplicated blocks with raid1 */ | |
5504 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
5505 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
5506 | ||
5507 | /* turn single device chunks into raid0 */ | |
5508 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
5509 | } | |
5510 | return flags; | |
5511 | } | |
5512 | ||
b2950863 | 5513 | static int __alloc_chunk_for_shrink(struct btrfs_root *root, |
0ef3e66b CM |
5514 | struct btrfs_block_group_cache *shrink_block_group, |
5515 | int force) | |
5516 | { | |
5517 | struct btrfs_trans_handle *trans; | |
5518 | u64 new_alloc_flags; | |
5519 | u64 calc; | |
5520 | ||
c286ac48 | 5521 | spin_lock(&shrink_block_group->lock); |
0ef3e66b | 5522 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
c286ac48 | 5523 | spin_unlock(&shrink_block_group->lock); |
c286ac48 | 5524 | |
0ef3e66b | 5525 | trans = btrfs_start_transaction(root, 1); |
c286ac48 | 5526 | spin_lock(&shrink_block_group->lock); |
7d9eb12c | 5527 | |
0ef3e66b CM |
5528 | new_alloc_flags = update_block_group_flags(root, |
5529 | shrink_block_group->flags); | |
5530 | if (new_alloc_flags != shrink_block_group->flags) { | |
5531 | calc = | |
5532 | btrfs_block_group_used(&shrink_block_group->item); | |
5533 | } else { | |
5534 | calc = shrink_block_group->key.offset; | |
5535 | } | |
c286ac48 CM |
5536 | spin_unlock(&shrink_block_group->lock); |
5537 | ||
0ef3e66b CM |
5538 | do_chunk_alloc(trans, root->fs_info->extent_root, |
5539 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
7d9eb12c | 5540 | |
0ef3e66b | 5541 | btrfs_end_transaction(trans, root); |
c286ac48 CM |
5542 | } else |
5543 | spin_unlock(&shrink_block_group->lock); | |
0ef3e66b CM |
5544 | return 0; |
5545 | } | |
5546 | ||
1a40e23b ZY |
5547 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
5548 | struct btrfs_root *root, | |
5549 | u64 objectid, u64 size) | |
5550 | { | |
5551 | struct btrfs_path *path; | |
5552 | struct btrfs_inode_item *item; | |
5553 | struct extent_buffer *leaf; | |
5554 | int ret; | |
5555 | ||
5556 | path = btrfs_alloc_path(); | |
5557 | if (!path) | |
5558 | return -ENOMEM; | |
5559 | ||
5560 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); | |
5561 | if (ret) | |
5562 | goto out; | |
5563 | ||
5564 | leaf = path->nodes[0]; | |
5565 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); | |
5566 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
5567 | btrfs_set_inode_generation(leaf, item, 1); | |
5568 | btrfs_set_inode_size(leaf, item, size); | |
5569 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); | |
0403e47e | 5570 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS); |
1a40e23b ZY |
5571 | btrfs_mark_buffer_dirty(leaf); |
5572 | btrfs_release_path(root, path); | |
5573 | out: | |
5574 | btrfs_free_path(path); | |
5575 | return ret; | |
5576 | } | |
5577 | ||
d397712b | 5578 | static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, |
1a40e23b ZY |
5579 | struct btrfs_block_group_cache *group) |
5580 | { | |
5581 | struct inode *inode = NULL; | |
5582 | struct btrfs_trans_handle *trans; | |
5583 | struct btrfs_root *root; | |
5584 | struct btrfs_key root_key; | |
5585 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; | |
5586 | int err = 0; | |
5587 | ||
5588 | root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; | |
5589 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
5590 | root_key.offset = (u64)-1; | |
5591 | root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
5592 | if (IS_ERR(root)) | |
5593 | return ERR_CAST(root); | |
5594 | ||
5595 | trans = btrfs_start_transaction(root, 1); | |
5596 | BUG_ON(!trans); | |
5597 | ||
5598 | err = btrfs_find_free_objectid(trans, root, objectid, &objectid); | |
5599 | if (err) | |
5600 | goto out; | |
5601 | ||
5602 | err = __insert_orphan_inode(trans, root, objectid, group->key.offset); | |
5603 | BUG_ON(err); | |
5604 | ||
5605 | err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, | |
c8b97818 CM |
5606 | group->key.offset, 0, group->key.offset, |
5607 | 0, 0, 0); | |
1a40e23b ZY |
5608 | BUG_ON(err); |
5609 | ||
5610 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); | |
5611 | if (inode->i_state & I_NEW) { | |
5612 | BTRFS_I(inode)->root = root; | |
5613 | BTRFS_I(inode)->location.objectid = objectid; | |
5614 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
5615 | BTRFS_I(inode)->location.offset = 0; | |
5616 | btrfs_read_locked_inode(inode); | |
5617 | unlock_new_inode(inode); | |
5618 | BUG_ON(is_bad_inode(inode)); | |
5619 | } else { | |
5620 | BUG_ON(1); | |
5621 | } | |
17d217fe | 5622 | BTRFS_I(inode)->index_cnt = group->key.objectid; |
1a40e23b ZY |
5623 | |
5624 | err = btrfs_orphan_add(trans, inode); | |
5625 | out: | |
5626 | btrfs_end_transaction(trans, root); | |
5627 | if (err) { | |
5628 | if (inode) | |
5629 | iput(inode); | |
5630 | inode = ERR_PTR(err); | |
5631 | } | |
5632 | return inode; | |
5633 | } | |
5634 | ||
17d217fe YZ |
5635 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) |
5636 | { | |
5637 | ||
5638 | struct btrfs_ordered_sum *sums; | |
5639 | struct btrfs_sector_sum *sector_sum; | |
5640 | struct btrfs_ordered_extent *ordered; | |
5641 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5642 | struct list_head list; | |
5643 | size_t offset; | |
5644 | int ret; | |
5645 | u64 disk_bytenr; | |
5646 | ||
5647 | INIT_LIST_HEAD(&list); | |
5648 | ||
5649 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); | |
5650 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); | |
5651 | ||
5652 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; | |
07d400a6 | 5653 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, |
17d217fe YZ |
5654 | disk_bytenr + len - 1, &list); |
5655 | ||
5656 | while (!list_empty(&list)) { | |
5657 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
5658 | list_del_init(&sums->list); | |
5659 | ||
5660 | sector_sum = sums->sums; | |
5661 | sums->bytenr = ordered->start; | |
5662 | ||
5663 | offset = 0; | |
5664 | while (offset < sums->len) { | |
5665 | sector_sum->bytenr += ordered->start - disk_bytenr; | |
5666 | sector_sum++; | |
5667 | offset += root->sectorsize; | |
5668 | } | |
5669 | ||
5670 | btrfs_add_ordered_sum(inode, ordered, sums); | |
5671 | } | |
5672 | btrfs_put_ordered_extent(ordered); | |
5673 | return 0; | |
5674 | } | |
5675 | ||
1a40e23b | 5676 | int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start) |
edbd8d4e CM |
5677 | { |
5678 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 5679 | struct btrfs_path *path; |
1a40e23b ZY |
5680 | struct btrfs_fs_info *info = root->fs_info; |
5681 | struct extent_buffer *leaf; | |
5682 | struct inode *reloc_inode; | |
5683 | struct btrfs_block_group_cache *block_group; | |
5684 | struct btrfs_key key; | |
d899e052 | 5685 | u64 skipped; |
edbd8d4e CM |
5686 | u64 cur_byte; |
5687 | u64 total_found; | |
edbd8d4e CM |
5688 | u32 nritems; |
5689 | int ret; | |
a061fc8d | 5690 | int progress; |
1a40e23b | 5691 | int pass = 0; |
edbd8d4e | 5692 | |
1a40e23b ZY |
5693 | root = root->fs_info->extent_root; |
5694 | ||
5695 | block_group = btrfs_lookup_block_group(info, group_start); | |
5696 | BUG_ON(!block_group); | |
8f18cf13 | 5697 | |
d397712b | 5698 | printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n", |
1a40e23b ZY |
5699 | (unsigned long long)block_group->key.objectid, |
5700 | (unsigned long long)block_group->flags); | |
8f18cf13 | 5701 | |
edbd8d4e | 5702 | path = btrfs_alloc_path(); |
1a40e23b | 5703 | BUG_ON(!path); |
edbd8d4e | 5704 | |
1a40e23b ZY |
5705 | reloc_inode = create_reloc_inode(info, block_group); |
5706 | BUG_ON(IS_ERR(reloc_inode)); | |
323da79c | 5707 | |
1a40e23b | 5708 | __alloc_chunk_for_shrink(root, block_group, 1); |
c146afad | 5709 | set_block_group_readonly(block_group); |
323da79c | 5710 | |
1a40e23b ZY |
5711 | btrfs_start_delalloc_inodes(info->tree_root); |
5712 | btrfs_wait_ordered_extents(info->tree_root, 0); | |
5713 | again: | |
d899e052 | 5714 | skipped = 0; |
edbd8d4e | 5715 | total_found = 0; |
a061fc8d | 5716 | progress = 0; |
1a40e23b | 5717 | key.objectid = block_group->key.objectid; |
edbd8d4e CM |
5718 | key.offset = 0; |
5719 | key.type = 0; | |
73e48b27 | 5720 | cur_byte = key.objectid; |
4313b399 | 5721 | |
1a40e23b ZY |
5722 | trans = btrfs_start_transaction(info->tree_root, 1); |
5723 | btrfs_commit_transaction(trans, info->tree_root); | |
ea8c2819 | 5724 | |
1a40e23b ZY |
5725 | mutex_lock(&root->fs_info->cleaner_mutex); |
5726 | btrfs_clean_old_snapshots(info->tree_root); | |
5727 | btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1); | |
5728 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
ea8c2819 | 5729 | |
d397712b | 5730 | while (1) { |
edbd8d4e CM |
5731 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5732 | if (ret < 0) | |
5733 | goto out; | |
7d9eb12c | 5734 | next: |
edbd8d4e | 5735 | leaf = path->nodes[0]; |
73e48b27 | 5736 | nritems = btrfs_header_nritems(leaf); |
73e48b27 Y |
5737 | if (path->slots[0] >= nritems) { |
5738 | ret = btrfs_next_leaf(root, path); | |
5739 | if (ret < 0) | |
5740 | goto out; | |
5741 | if (ret == 1) { | |
5742 | ret = 0; | |
5743 | break; | |
edbd8d4e | 5744 | } |
73e48b27 Y |
5745 | leaf = path->nodes[0]; |
5746 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 5747 | } |
73e48b27 | 5748 | |
1a40e23b | 5749 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
725c8463 | 5750 | |
1a40e23b ZY |
5751 | if (key.objectid >= block_group->key.objectid + |
5752 | block_group->key.offset) | |
8f18cf13 CM |
5753 | break; |
5754 | ||
725c8463 | 5755 | if (progress && need_resched()) { |
725c8463 | 5756 | btrfs_release_path(root, path); |
1a40e23b | 5757 | cond_resched(); |
725c8463 | 5758 | progress = 0; |
1a40e23b | 5759 | continue; |
725c8463 CM |
5760 | } |
5761 | progress = 1; | |
5762 | ||
1a40e23b ZY |
5763 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY || |
5764 | key.objectid + key.offset <= cur_byte) { | |
edbd8d4e | 5765 | path->slots[0]++; |
edbd8d4e CM |
5766 | goto next; |
5767 | } | |
73e48b27 | 5768 | |
edbd8d4e | 5769 | total_found++; |
1a40e23b | 5770 | cur_byte = key.objectid + key.offset; |
edbd8d4e | 5771 | btrfs_release_path(root, path); |
edbd8d4e | 5772 | |
1a40e23b ZY |
5773 | __alloc_chunk_for_shrink(root, block_group, 0); |
5774 | ret = relocate_one_extent(root, path, &key, block_group, | |
5775 | reloc_inode, pass); | |
5776 | BUG_ON(ret < 0); | |
d899e052 YZ |
5777 | if (ret > 0) |
5778 | skipped++; | |
edbd8d4e | 5779 | |
1a40e23b ZY |
5780 | key.objectid = cur_byte; |
5781 | key.type = 0; | |
5782 | key.offset = 0; | |
edbd8d4e CM |
5783 | } |
5784 | ||
1a40e23b | 5785 | btrfs_release_path(root, path); |
7d9eb12c | 5786 | |
1a40e23b ZY |
5787 | if (pass == 0) { |
5788 | btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1); | |
5789 | invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1); | |
8e8a1e31 | 5790 | } |
73e48b27 | 5791 | |
1a40e23b | 5792 | if (total_found > 0) { |
d397712b | 5793 | printk(KERN_INFO "btrfs found %llu extents in pass %d\n", |
1a40e23b ZY |
5794 | (unsigned long long)total_found, pass); |
5795 | pass++; | |
d899e052 YZ |
5796 | if (total_found == skipped && pass > 2) { |
5797 | iput(reloc_inode); | |
5798 | reloc_inode = create_reloc_inode(info, block_group); | |
5799 | pass = 0; | |
5800 | } | |
1a40e23b | 5801 | goto again; |
0f9dd46c | 5802 | } |
0ef3e66b | 5803 | |
1a40e23b ZY |
5804 | /* delete reloc_inode */ |
5805 | iput(reloc_inode); | |
5806 | ||
5807 | /* unpin extents in this range */ | |
5808 | trans = btrfs_start_transaction(info->tree_root, 1); | |
5809 | btrfs_commit_transaction(trans, info->tree_root); | |
0ef3e66b | 5810 | |
1a40e23b ZY |
5811 | spin_lock(&block_group->lock); |
5812 | WARN_ON(block_group->pinned > 0); | |
5813 | WARN_ON(block_group->reserved > 0); | |
5814 | WARN_ON(btrfs_block_group_used(&block_group->item) > 0); | |
5815 | spin_unlock(&block_group->lock); | |
d2fb3437 | 5816 | put_block_group(block_group); |
1a40e23b | 5817 | ret = 0; |
edbd8d4e | 5818 | out: |
1a40e23b | 5819 | btrfs_free_path(path); |
edbd8d4e CM |
5820 | return ret; |
5821 | } | |
5822 | ||
b2950863 CH |
5823 | static int find_first_block_group(struct btrfs_root *root, |
5824 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 5825 | { |
925baedd | 5826 | int ret = 0; |
0b86a832 CM |
5827 | struct btrfs_key found_key; |
5828 | struct extent_buffer *leaf; | |
5829 | int slot; | |
edbd8d4e | 5830 | |
0b86a832 CM |
5831 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
5832 | if (ret < 0) | |
925baedd CM |
5833 | goto out; |
5834 | ||
d397712b | 5835 | while (1) { |
0b86a832 | 5836 | slot = path->slots[0]; |
edbd8d4e | 5837 | leaf = path->nodes[0]; |
0b86a832 CM |
5838 | if (slot >= btrfs_header_nritems(leaf)) { |
5839 | ret = btrfs_next_leaf(root, path); | |
5840 | if (ret == 0) | |
5841 | continue; | |
5842 | if (ret < 0) | |
925baedd | 5843 | goto out; |
0b86a832 | 5844 | break; |
edbd8d4e | 5845 | } |
0b86a832 | 5846 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 5847 | |
0b86a832 | 5848 | if (found_key.objectid >= key->objectid && |
925baedd CM |
5849 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5850 | ret = 0; | |
5851 | goto out; | |
5852 | } | |
0b86a832 | 5853 | path->slots[0]++; |
edbd8d4e | 5854 | } |
0b86a832 | 5855 | ret = -ENOENT; |
925baedd | 5856 | out: |
0b86a832 | 5857 | return ret; |
edbd8d4e CM |
5858 | } |
5859 | ||
1a40e23b ZY |
5860 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
5861 | { | |
5862 | struct btrfs_block_group_cache *block_group; | |
5863 | struct rb_node *n; | |
5864 | ||
1a40e23b ZY |
5865 | spin_lock(&info->block_group_cache_lock); |
5866 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
5867 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
5868 | cache_node); | |
1a40e23b ZY |
5869 | rb_erase(&block_group->cache_node, |
5870 | &info->block_group_cache_tree); | |
d899e052 YZ |
5871 | spin_unlock(&info->block_group_cache_lock); |
5872 | ||
5873 | btrfs_remove_free_space_cache(block_group); | |
80eb234a | 5874 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 5875 | list_del(&block_group->list); |
80eb234a | 5876 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 YZ |
5877 | |
5878 | WARN_ON(atomic_read(&block_group->count) != 1); | |
1a40e23b | 5879 | kfree(block_group); |
d899e052 YZ |
5880 | |
5881 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
5882 | } |
5883 | spin_unlock(&info->block_group_cache_lock); | |
1a40e23b ZY |
5884 | return 0; |
5885 | } | |
5886 | ||
9078a3e1 CM |
5887 | int btrfs_read_block_groups(struct btrfs_root *root) |
5888 | { | |
5889 | struct btrfs_path *path; | |
5890 | int ret; | |
9078a3e1 | 5891 | struct btrfs_block_group_cache *cache; |
be744175 | 5892 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 5893 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
5894 | struct btrfs_key key; |
5895 | struct btrfs_key found_key; | |
5f39d397 | 5896 | struct extent_buffer *leaf; |
96b5179d | 5897 | |
be744175 | 5898 | root = info->extent_root; |
9078a3e1 | 5899 | key.objectid = 0; |
0b86a832 | 5900 | key.offset = 0; |
9078a3e1 | 5901 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
5902 | path = btrfs_alloc_path(); |
5903 | if (!path) | |
5904 | return -ENOMEM; | |
5905 | ||
d397712b | 5906 | while (1) { |
0b86a832 CM |
5907 | ret = find_first_block_group(root, path, &key); |
5908 | if (ret > 0) { | |
5909 | ret = 0; | |
5910 | goto error; | |
9078a3e1 | 5911 | } |
0b86a832 CM |
5912 | if (ret != 0) |
5913 | goto error; | |
5914 | ||
5f39d397 CM |
5915 | leaf = path->nodes[0]; |
5916 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 5917 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 5918 | if (!cache) { |
0b86a832 | 5919 | ret = -ENOMEM; |
9078a3e1 CM |
5920 | break; |
5921 | } | |
3e1ad54f | 5922 | |
d2fb3437 | 5923 | atomic_set(&cache->count, 1); |
c286ac48 | 5924 | spin_lock_init(&cache->lock); |
25179201 | 5925 | mutex_init(&cache->alloc_mutex); |
ea6a478e | 5926 | mutex_init(&cache->cache_mutex); |
0f9dd46c | 5927 | INIT_LIST_HEAD(&cache->list); |
5f39d397 CM |
5928 | read_extent_buffer(leaf, &cache->item, |
5929 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
5930 | sizeof(cache->item)); | |
9078a3e1 | 5931 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 5932 | |
9078a3e1 CM |
5933 | key.objectid = found_key.objectid + found_key.offset; |
5934 | btrfs_release_path(root, path); | |
0b86a832 | 5935 | cache->flags = btrfs_block_group_flags(&cache->item); |
96b5179d | 5936 | |
6324fbf3 CM |
5937 | ret = update_space_info(info, cache->flags, found_key.offset, |
5938 | btrfs_block_group_used(&cache->item), | |
5939 | &space_info); | |
5940 | BUG_ON(ret); | |
5941 | cache->space_info = space_info; | |
80eb234a JB |
5942 | down_write(&space_info->groups_sem); |
5943 | list_add_tail(&cache->list, &space_info->block_groups); | |
5944 | up_write(&space_info->groups_sem); | |
0f9dd46c JB |
5945 | |
5946 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
5947 | BUG_ON(ret); | |
75ccf47d CM |
5948 | |
5949 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c YZ |
5950 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
5951 | set_block_group_readonly(cache); | |
9078a3e1 | 5952 | } |
0b86a832 CM |
5953 | ret = 0; |
5954 | error: | |
9078a3e1 | 5955 | btrfs_free_path(path); |
0b86a832 | 5956 | return ret; |
9078a3e1 | 5957 | } |
6324fbf3 CM |
5958 | |
5959 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
5960 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 5961 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
5962 | u64 size) |
5963 | { | |
5964 | int ret; | |
6324fbf3 CM |
5965 | struct btrfs_root *extent_root; |
5966 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
5967 | |
5968 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 5969 | |
e02119d5 CM |
5970 | root->fs_info->last_trans_new_blockgroup = trans->transid; |
5971 | ||
8f18cf13 | 5972 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
5973 | if (!cache) |
5974 | return -ENOMEM; | |
5975 | ||
e17cade2 | 5976 | cache->key.objectid = chunk_offset; |
6324fbf3 | 5977 | cache->key.offset = size; |
d2fb3437 YZ |
5978 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
5979 | atomic_set(&cache->count, 1); | |
c286ac48 | 5980 | spin_lock_init(&cache->lock); |
25179201 | 5981 | mutex_init(&cache->alloc_mutex); |
ea6a478e | 5982 | mutex_init(&cache->cache_mutex); |
0f9dd46c | 5983 | INIT_LIST_HEAD(&cache->list); |
0ef3e66b | 5984 | |
6324fbf3 | 5985 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
5986 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
5987 | cache->flags = type; | |
5988 | btrfs_set_block_group_flags(&cache->item, type); | |
5989 | ||
5990 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
5991 | &cache->space_info); | |
5992 | BUG_ON(ret); | |
80eb234a JB |
5993 | down_write(&cache->space_info->groups_sem); |
5994 | list_add_tail(&cache->list, &cache->space_info->block_groups); | |
5995 | up_write(&cache->space_info->groups_sem); | |
6324fbf3 | 5996 | |
0f9dd46c JB |
5997 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
5998 | BUG_ON(ret); | |
c286ac48 | 5999 | |
6324fbf3 CM |
6000 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
6001 | sizeof(cache->item)); | |
6002 | BUG_ON(ret); | |
6003 | ||
87ef2bb4 CM |
6004 | finish_current_insert(trans, extent_root, 0); |
6005 | ret = del_pending_extents(trans, extent_root, 0); | |
6324fbf3 | 6006 | BUG_ON(ret); |
d18a2c44 | 6007 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 6008 | |
6324fbf3 CM |
6009 | return 0; |
6010 | } | |
1a40e23b ZY |
6011 | |
6012 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
6013 | struct btrfs_root *root, u64 group_start) | |
6014 | { | |
6015 | struct btrfs_path *path; | |
6016 | struct btrfs_block_group_cache *block_group; | |
6017 | struct btrfs_key key; | |
6018 | int ret; | |
6019 | ||
1a40e23b ZY |
6020 | root = root->fs_info->extent_root; |
6021 | ||
6022 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
6023 | BUG_ON(!block_group); | |
c146afad | 6024 | BUG_ON(!block_group->ro); |
1a40e23b ZY |
6025 | |
6026 | memcpy(&key, &block_group->key, sizeof(key)); | |
6027 | ||
6028 | path = btrfs_alloc_path(); | |
6029 | BUG_ON(!path); | |
6030 | ||
3dfdb934 | 6031 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
6032 | rb_erase(&block_group->cache_node, |
6033 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 YZ |
6034 | spin_unlock(&root->fs_info->block_group_cache_lock); |
6035 | btrfs_remove_free_space_cache(block_group); | |
80eb234a | 6036 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 6037 | list_del(&block_group->list); |
80eb234a | 6038 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 6039 | |
c146afad YZ |
6040 | spin_lock(&block_group->space_info->lock); |
6041 | block_group->space_info->total_bytes -= block_group->key.offset; | |
6042 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
6043 | spin_unlock(&block_group->space_info->lock); | |
2b82032c | 6044 | block_group->space_info->full = 0; |
c146afad | 6045 | |
d2fb3437 YZ |
6046 | put_block_group(block_group); |
6047 | put_block_group(block_group); | |
1a40e23b ZY |
6048 | |
6049 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
6050 | if (ret > 0) | |
6051 | ret = -EIO; | |
6052 | if (ret < 0) | |
6053 | goto out; | |
6054 | ||
6055 | ret = btrfs_del_item(trans, root, path); | |
6056 | out: | |
6057 | btrfs_free_path(path); | |
6058 | return ret; | |
6059 | } |