Commit | Line | Data |
---|---|---|
5d4f98a2 YZ |
1 | /* |
2 | * Copyright (C) 2009 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 | */ | |
18 | ||
19 | #include <linux/sched.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/writeback.h> | |
22 | #include <linux/blkdev.h> | |
23 | #include <linux/rbtree.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
5d4f98a2 YZ |
25 | #include "ctree.h" |
26 | #include "disk-io.h" | |
27 | #include "transaction.h" | |
28 | #include "volumes.h" | |
29 | #include "locking.h" | |
30 | #include "btrfs_inode.h" | |
31 | #include "async-thread.h" | |
0af3d00b | 32 | #include "free-space-cache.h" |
581bb050 | 33 | #include "inode-map.h" |
5d4f98a2 YZ |
34 | |
35 | /* | |
36 | * backref_node, mapping_node and tree_block start with this | |
37 | */ | |
38 | struct tree_entry { | |
39 | struct rb_node rb_node; | |
40 | u64 bytenr; | |
41 | }; | |
42 | ||
43 | /* | |
44 | * present a tree block in the backref cache | |
45 | */ | |
46 | struct backref_node { | |
47 | struct rb_node rb_node; | |
48 | u64 bytenr; | |
3fd0a558 YZ |
49 | |
50 | u64 new_bytenr; | |
51 | /* objectid of tree block owner, can be not uptodate */ | |
5d4f98a2 | 52 | u64 owner; |
3fd0a558 YZ |
53 | /* link to pending, changed or detached list */ |
54 | struct list_head list; | |
5d4f98a2 YZ |
55 | /* list of upper level blocks reference this block */ |
56 | struct list_head upper; | |
57 | /* list of child blocks in the cache */ | |
58 | struct list_head lower; | |
59 | /* NULL if this node is not tree root */ | |
60 | struct btrfs_root *root; | |
61 | /* extent buffer got by COW the block */ | |
62 | struct extent_buffer *eb; | |
63 | /* level of tree block */ | |
64 | unsigned int level:8; | |
3fd0a558 YZ |
65 | /* is the block in non-reference counted tree */ |
66 | unsigned int cowonly:1; | |
67 | /* 1 if no child node in the cache */ | |
5d4f98a2 YZ |
68 | unsigned int lowest:1; |
69 | /* is the extent buffer locked */ | |
70 | unsigned int locked:1; | |
71 | /* has the block been processed */ | |
72 | unsigned int processed:1; | |
73 | /* have backrefs of this block been checked */ | |
74 | unsigned int checked:1; | |
3fd0a558 YZ |
75 | /* |
76 | * 1 if corresponding block has been cowed but some upper | |
77 | * level block pointers may not point to the new location | |
78 | */ | |
79 | unsigned int pending:1; | |
80 | /* | |
81 | * 1 if the backref node isn't connected to any other | |
82 | * backref node. | |
83 | */ | |
84 | unsigned int detached:1; | |
5d4f98a2 YZ |
85 | }; |
86 | ||
87 | /* | |
88 | * present a block pointer in the backref cache | |
89 | */ | |
90 | struct backref_edge { | |
91 | struct list_head list[2]; | |
92 | struct backref_node *node[2]; | |
5d4f98a2 YZ |
93 | }; |
94 | ||
95 | #define LOWER 0 | |
96 | #define UPPER 1 | |
97 | ||
98 | struct backref_cache { | |
99 | /* red black tree of all backref nodes in the cache */ | |
100 | struct rb_root rb_root; | |
3fd0a558 YZ |
101 | /* for passing backref nodes to btrfs_reloc_cow_block */ |
102 | struct backref_node *path[BTRFS_MAX_LEVEL]; | |
103 | /* | |
104 | * list of blocks that have been cowed but some block | |
105 | * pointers in upper level blocks may not reflect the | |
106 | * new location | |
107 | */ | |
5d4f98a2 | 108 | struct list_head pending[BTRFS_MAX_LEVEL]; |
3fd0a558 YZ |
109 | /* list of backref nodes with no child node */ |
110 | struct list_head leaves; | |
111 | /* list of blocks that have been cowed in current transaction */ | |
112 | struct list_head changed; | |
113 | /* list of detached backref node. */ | |
114 | struct list_head detached; | |
115 | ||
116 | u64 last_trans; | |
117 | ||
118 | int nr_nodes; | |
119 | int nr_edges; | |
5d4f98a2 YZ |
120 | }; |
121 | ||
122 | /* | |
123 | * map address of tree root to tree | |
124 | */ | |
125 | struct mapping_node { | |
126 | struct rb_node rb_node; | |
127 | u64 bytenr; | |
128 | void *data; | |
129 | }; | |
130 | ||
131 | struct mapping_tree { | |
132 | struct rb_root rb_root; | |
133 | spinlock_t lock; | |
134 | }; | |
135 | ||
136 | /* | |
137 | * present a tree block to process | |
138 | */ | |
139 | struct tree_block { | |
140 | struct rb_node rb_node; | |
141 | u64 bytenr; | |
142 | struct btrfs_key key; | |
143 | unsigned int level:8; | |
144 | unsigned int key_ready:1; | |
145 | }; | |
146 | ||
0257bb82 YZ |
147 | #define MAX_EXTENTS 128 |
148 | ||
149 | struct file_extent_cluster { | |
150 | u64 start; | |
151 | u64 end; | |
152 | u64 boundary[MAX_EXTENTS]; | |
153 | unsigned int nr; | |
154 | }; | |
155 | ||
5d4f98a2 YZ |
156 | struct reloc_control { |
157 | /* block group to relocate */ | |
158 | struct btrfs_block_group_cache *block_group; | |
159 | /* extent tree */ | |
160 | struct btrfs_root *extent_root; | |
161 | /* inode for moving data */ | |
162 | struct inode *data_inode; | |
3fd0a558 YZ |
163 | |
164 | struct btrfs_block_rsv *block_rsv; | |
165 | ||
166 | struct backref_cache backref_cache; | |
167 | ||
168 | struct file_extent_cluster cluster; | |
5d4f98a2 YZ |
169 | /* tree blocks have been processed */ |
170 | struct extent_io_tree processed_blocks; | |
171 | /* map start of tree root to corresponding reloc tree */ | |
172 | struct mapping_tree reloc_root_tree; | |
173 | /* list of reloc trees */ | |
174 | struct list_head reloc_roots; | |
3fd0a558 YZ |
175 | /* size of metadata reservation for merging reloc trees */ |
176 | u64 merging_rsv_size; | |
177 | /* size of relocated tree nodes */ | |
178 | u64 nodes_relocated; | |
179 | ||
5d4f98a2 YZ |
180 | u64 search_start; |
181 | u64 extents_found; | |
3fd0a558 | 182 | |
3fd0a558 YZ |
183 | unsigned int stage:8; |
184 | unsigned int create_reloc_tree:1; | |
185 | unsigned int merge_reloc_tree:1; | |
5d4f98a2 | 186 | unsigned int found_file_extent:1; |
3fd0a558 | 187 | unsigned int commit_transaction:1; |
5d4f98a2 YZ |
188 | }; |
189 | ||
190 | /* stages of data relocation */ | |
191 | #define MOVE_DATA_EXTENTS 0 | |
192 | #define UPDATE_DATA_PTRS 1 | |
193 | ||
3fd0a558 YZ |
194 | static void remove_backref_node(struct backref_cache *cache, |
195 | struct backref_node *node); | |
196 | static void __mark_block_processed(struct reloc_control *rc, | |
197 | struct backref_node *node); | |
5d4f98a2 YZ |
198 | |
199 | static void mapping_tree_init(struct mapping_tree *tree) | |
200 | { | |
6bef4d31 | 201 | tree->rb_root = RB_ROOT; |
5d4f98a2 YZ |
202 | spin_lock_init(&tree->lock); |
203 | } | |
204 | ||
205 | static void backref_cache_init(struct backref_cache *cache) | |
206 | { | |
207 | int i; | |
6bef4d31 | 208 | cache->rb_root = RB_ROOT; |
5d4f98a2 YZ |
209 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) |
210 | INIT_LIST_HEAD(&cache->pending[i]); | |
3fd0a558 YZ |
211 | INIT_LIST_HEAD(&cache->changed); |
212 | INIT_LIST_HEAD(&cache->detached); | |
213 | INIT_LIST_HEAD(&cache->leaves); | |
214 | } | |
215 | ||
216 | static void backref_cache_cleanup(struct backref_cache *cache) | |
217 | { | |
218 | struct backref_node *node; | |
219 | int i; | |
220 | ||
221 | while (!list_empty(&cache->detached)) { | |
222 | node = list_entry(cache->detached.next, | |
223 | struct backref_node, list); | |
224 | remove_backref_node(cache, node); | |
225 | } | |
226 | ||
227 | while (!list_empty(&cache->leaves)) { | |
228 | node = list_entry(cache->leaves.next, | |
229 | struct backref_node, lower); | |
230 | remove_backref_node(cache, node); | |
231 | } | |
232 | ||
233 | cache->last_trans = 0; | |
234 | ||
235 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) | |
236 | BUG_ON(!list_empty(&cache->pending[i])); | |
237 | BUG_ON(!list_empty(&cache->changed)); | |
238 | BUG_ON(!list_empty(&cache->detached)); | |
239 | BUG_ON(!RB_EMPTY_ROOT(&cache->rb_root)); | |
240 | BUG_ON(cache->nr_nodes); | |
241 | BUG_ON(cache->nr_edges); | |
242 | } | |
243 | ||
244 | static struct backref_node *alloc_backref_node(struct backref_cache *cache) | |
245 | { | |
246 | struct backref_node *node; | |
247 | ||
248 | node = kzalloc(sizeof(*node), GFP_NOFS); | |
249 | if (node) { | |
250 | INIT_LIST_HEAD(&node->list); | |
251 | INIT_LIST_HEAD(&node->upper); | |
252 | INIT_LIST_HEAD(&node->lower); | |
253 | RB_CLEAR_NODE(&node->rb_node); | |
254 | cache->nr_nodes++; | |
255 | } | |
256 | return node; | |
257 | } | |
258 | ||
259 | static void free_backref_node(struct backref_cache *cache, | |
260 | struct backref_node *node) | |
261 | { | |
262 | if (node) { | |
263 | cache->nr_nodes--; | |
264 | kfree(node); | |
265 | } | |
266 | } | |
267 | ||
268 | static struct backref_edge *alloc_backref_edge(struct backref_cache *cache) | |
269 | { | |
270 | struct backref_edge *edge; | |
271 | ||
272 | edge = kzalloc(sizeof(*edge), GFP_NOFS); | |
273 | if (edge) | |
274 | cache->nr_edges++; | |
275 | return edge; | |
5d4f98a2 YZ |
276 | } |
277 | ||
3fd0a558 YZ |
278 | static void free_backref_edge(struct backref_cache *cache, |
279 | struct backref_edge *edge) | |
5d4f98a2 | 280 | { |
3fd0a558 YZ |
281 | if (edge) { |
282 | cache->nr_edges--; | |
283 | kfree(edge); | |
284 | } | |
5d4f98a2 YZ |
285 | } |
286 | ||
287 | static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr, | |
288 | struct rb_node *node) | |
289 | { | |
290 | struct rb_node **p = &root->rb_node; | |
291 | struct rb_node *parent = NULL; | |
292 | struct tree_entry *entry; | |
293 | ||
294 | while (*p) { | |
295 | parent = *p; | |
296 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
297 | ||
298 | if (bytenr < entry->bytenr) | |
299 | p = &(*p)->rb_left; | |
300 | else if (bytenr > entry->bytenr) | |
301 | p = &(*p)->rb_right; | |
302 | else | |
303 | return parent; | |
304 | } | |
305 | ||
306 | rb_link_node(node, parent, p); | |
307 | rb_insert_color(node, root); | |
308 | return NULL; | |
309 | } | |
310 | ||
311 | static struct rb_node *tree_search(struct rb_root *root, u64 bytenr) | |
312 | { | |
313 | struct rb_node *n = root->rb_node; | |
314 | struct tree_entry *entry; | |
315 | ||
316 | while (n) { | |
317 | entry = rb_entry(n, struct tree_entry, rb_node); | |
318 | ||
319 | if (bytenr < entry->bytenr) | |
320 | n = n->rb_left; | |
321 | else if (bytenr > entry->bytenr) | |
322 | n = n->rb_right; | |
323 | else | |
324 | return n; | |
325 | } | |
326 | return NULL; | |
327 | } | |
328 | ||
48a3b636 | 329 | static void backref_tree_panic(struct rb_node *rb_node, int errno, u64 bytenr) |
43c04fb1 JM |
330 | { |
331 | ||
332 | struct btrfs_fs_info *fs_info = NULL; | |
333 | struct backref_node *bnode = rb_entry(rb_node, struct backref_node, | |
334 | rb_node); | |
335 | if (bnode->root) | |
336 | fs_info = bnode->root->fs_info; | |
337 | btrfs_panic(fs_info, errno, "Inconsistency in backref cache " | |
338 | "found at offset %llu\n", (unsigned long long)bytenr); | |
339 | } | |
340 | ||
5d4f98a2 YZ |
341 | /* |
342 | * walk up backref nodes until reach node presents tree root | |
343 | */ | |
344 | static struct backref_node *walk_up_backref(struct backref_node *node, | |
345 | struct backref_edge *edges[], | |
346 | int *index) | |
347 | { | |
348 | struct backref_edge *edge; | |
349 | int idx = *index; | |
350 | ||
351 | while (!list_empty(&node->upper)) { | |
352 | edge = list_entry(node->upper.next, | |
353 | struct backref_edge, list[LOWER]); | |
354 | edges[idx++] = edge; | |
355 | node = edge->node[UPPER]; | |
356 | } | |
3fd0a558 | 357 | BUG_ON(node->detached); |
5d4f98a2 YZ |
358 | *index = idx; |
359 | return node; | |
360 | } | |
361 | ||
362 | /* | |
363 | * walk down backref nodes to find start of next reference path | |
364 | */ | |
365 | static struct backref_node *walk_down_backref(struct backref_edge *edges[], | |
366 | int *index) | |
367 | { | |
368 | struct backref_edge *edge; | |
369 | struct backref_node *lower; | |
370 | int idx = *index; | |
371 | ||
372 | while (idx > 0) { | |
373 | edge = edges[idx - 1]; | |
374 | lower = edge->node[LOWER]; | |
375 | if (list_is_last(&edge->list[LOWER], &lower->upper)) { | |
376 | idx--; | |
377 | continue; | |
378 | } | |
379 | edge = list_entry(edge->list[LOWER].next, | |
380 | struct backref_edge, list[LOWER]); | |
381 | edges[idx - 1] = edge; | |
382 | *index = idx; | |
383 | return edge->node[UPPER]; | |
384 | } | |
385 | *index = 0; | |
386 | return NULL; | |
387 | } | |
388 | ||
3fd0a558 YZ |
389 | static void unlock_node_buffer(struct backref_node *node) |
390 | { | |
391 | if (node->locked) { | |
392 | btrfs_tree_unlock(node->eb); | |
393 | node->locked = 0; | |
394 | } | |
395 | } | |
396 | ||
5d4f98a2 YZ |
397 | static void drop_node_buffer(struct backref_node *node) |
398 | { | |
399 | if (node->eb) { | |
3fd0a558 | 400 | unlock_node_buffer(node); |
5d4f98a2 YZ |
401 | free_extent_buffer(node->eb); |
402 | node->eb = NULL; | |
403 | } | |
404 | } | |
405 | ||
406 | static void drop_backref_node(struct backref_cache *tree, | |
407 | struct backref_node *node) | |
408 | { | |
5d4f98a2 YZ |
409 | BUG_ON(!list_empty(&node->upper)); |
410 | ||
411 | drop_node_buffer(node); | |
3fd0a558 | 412 | list_del(&node->list); |
5d4f98a2 | 413 | list_del(&node->lower); |
3fd0a558 YZ |
414 | if (!RB_EMPTY_NODE(&node->rb_node)) |
415 | rb_erase(&node->rb_node, &tree->rb_root); | |
416 | free_backref_node(tree, node); | |
5d4f98a2 YZ |
417 | } |
418 | ||
419 | /* | |
420 | * remove a backref node from the backref cache | |
421 | */ | |
422 | static void remove_backref_node(struct backref_cache *cache, | |
423 | struct backref_node *node) | |
424 | { | |
425 | struct backref_node *upper; | |
426 | struct backref_edge *edge; | |
427 | ||
428 | if (!node) | |
429 | return; | |
430 | ||
3fd0a558 | 431 | BUG_ON(!node->lowest && !node->detached); |
5d4f98a2 YZ |
432 | while (!list_empty(&node->upper)) { |
433 | edge = list_entry(node->upper.next, struct backref_edge, | |
434 | list[LOWER]); | |
435 | upper = edge->node[UPPER]; | |
436 | list_del(&edge->list[LOWER]); | |
437 | list_del(&edge->list[UPPER]); | |
3fd0a558 YZ |
438 | free_backref_edge(cache, edge); |
439 | ||
440 | if (RB_EMPTY_NODE(&upper->rb_node)) { | |
441 | BUG_ON(!list_empty(&node->upper)); | |
442 | drop_backref_node(cache, node); | |
443 | node = upper; | |
444 | node->lowest = 1; | |
445 | continue; | |
446 | } | |
5d4f98a2 | 447 | /* |
3fd0a558 | 448 | * add the node to leaf node list if no other |
5d4f98a2 YZ |
449 | * child block cached. |
450 | */ | |
451 | if (list_empty(&upper->lower)) { | |
3fd0a558 | 452 | list_add_tail(&upper->lower, &cache->leaves); |
5d4f98a2 YZ |
453 | upper->lowest = 1; |
454 | } | |
455 | } | |
3fd0a558 | 456 | |
5d4f98a2 YZ |
457 | drop_backref_node(cache, node); |
458 | } | |
459 | ||
3fd0a558 YZ |
460 | static void update_backref_node(struct backref_cache *cache, |
461 | struct backref_node *node, u64 bytenr) | |
462 | { | |
463 | struct rb_node *rb_node; | |
464 | rb_erase(&node->rb_node, &cache->rb_root); | |
465 | node->bytenr = bytenr; | |
466 | rb_node = tree_insert(&cache->rb_root, node->bytenr, &node->rb_node); | |
43c04fb1 JM |
467 | if (rb_node) |
468 | backref_tree_panic(rb_node, -EEXIST, bytenr); | |
3fd0a558 YZ |
469 | } |
470 | ||
471 | /* | |
472 | * update backref cache after a transaction commit | |
473 | */ | |
474 | static int update_backref_cache(struct btrfs_trans_handle *trans, | |
475 | struct backref_cache *cache) | |
476 | { | |
477 | struct backref_node *node; | |
478 | int level = 0; | |
479 | ||
480 | if (cache->last_trans == 0) { | |
481 | cache->last_trans = trans->transid; | |
482 | return 0; | |
483 | } | |
484 | ||
485 | if (cache->last_trans == trans->transid) | |
486 | return 0; | |
487 | ||
488 | /* | |
489 | * detached nodes are used to avoid unnecessary backref | |
490 | * lookup. transaction commit changes the extent tree. | |
491 | * so the detached nodes are no longer useful. | |
492 | */ | |
493 | while (!list_empty(&cache->detached)) { | |
494 | node = list_entry(cache->detached.next, | |
495 | struct backref_node, list); | |
496 | remove_backref_node(cache, node); | |
497 | } | |
498 | ||
499 | while (!list_empty(&cache->changed)) { | |
500 | node = list_entry(cache->changed.next, | |
501 | struct backref_node, list); | |
502 | list_del_init(&node->list); | |
503 | BUG_ON(node->pending); | |
504 | update_backref_node(cache, node, node->new_bytenr); | |
505 | } | |
506 | ||
507 | /* | |
508 | * some nodes can be left in the pending list if there were | |
509 | * errors during processing the pending nodes. | |
510 | */ | |
511 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { | |
512 | list_for_each_entry(node, &cache->pending[level], list) { | |
513 | BUG_ON(!node->pending); | |
514 | if (node->bytenr == node->new_bytenr) | |
515 | continue; | |
516 | update_backref_node(cache, node, node->new_bytenr); | |
517 | } | |
518 | } | |
519 | ||
520 | cache->last_trans = 0; | |
521 | return 1; | |
522 | } | |
523 | ||
f2a97a9d | 524 | |
3fd0a558 YZ |
525 | static int should_ignore_root(struct btrfs_root *root) |
526 | { | |
527 | struct btrfs_root *reloc_root; | |
528 | ||
529 | if (!root->ref_cows) | |
530 | return 0; | |
531 | ||
532 | reloc_root = root->reloc_root; | |
533 | if (!reloc_root) | |
534 | return 0; | |
535 | ||
536 | if (btrfs_root_last_snapshot(&reloc_root->root_item) == | |
537 | root->fs_info->running_transaction->transid - 1) | |
538 | return 0; | |
539 | /* | |
540 | * if there is reloc tree and it was created in previous | |
541 | * transaction backref lookup can find the reloc tree, | |
542 | * so backref node for the fs tree root is useless for | |
543 | * relocation. | |
544 | */ | |
545 | return 1; | |
546 | } | |
5d4f98a2 YZ |
547 | /* |
548 | * find reloc tree by address of tree root | |
549 | */ | |
550 | static struct btrfs_root *find_reloc_root(struct reloc_control *rc, | |
551 | u64 bytenr) | |
552 | { | |
553 | struct rb_node *rb_node; | |
554 | struct mapping_node *node; | |
555 | struct btrfs_root *root = NULL; | |
556 | ||
557 | spin_lock(&rc->reloc_root_tree.lock); | |
558 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, bytenr); | |
559 | if (rb_node) { | |
560 | node = rb_entry(rb_node, struct mapping_node, rb_node); | |
561 | root = (struct btrfs_root *)node->data; | |
562 | } | |
563 | spin_unlock(&rc->reloc_root_tree.lock); | |
564 | return root; | |
565 | } | |
566 | ||
567 | static int is_cowonly_root(u64 root_objectid) | |
568 | { | |
569 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
570 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
571 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
572 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
573 | root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
574 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) | |
575 | return 1; | |
576 | return 0; | |
577 | } | |
578 | ||
579 | static struct btrfs_root *read_fs_root(struct btrfs_fs_info *fs_info, | |
580 | u64 root_objectid) | |
581 | { | |
582 | struct btrfs_key key; | |
583 | ||
584 | key.objectid = root_objectid; | |
585 | key.type = BTRFS_ROOT_ITEM_KEY; | |
586 | if (is_cowonly_root(root_objectid)) | |
587 | key.offset = 0; | |
588 | else | |
589 | key.offset = (u64)-1; | |
590 | ||
591 | return btrfs_read_fs_root_no_name(fs_info, &key); | |
592 | } | |
593 | ||
594 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
595 | static noinline_for_stack | |
596 | struct btrfs_root *find_tree_root(struct reloc_control *rc, | |
597 | struct extent_buffer *leaf, | |
598 | struct btrfs_extent_ref_v0 *ref0) | |
599 | { | |
600 | struct btrfs_root *root; | |
601 | u64 root_objectid = btrfs_ref_root_v0(leaf, ref0); | |
602 | u64 generation = btrfs_ref_generation_v0(leaf, ref0); | |
603 | ||
604 | BUG_ON(root_objectid == BTRFS_TREE_RELOC_OBJECTID); | |
605 | ||
606 | root = read_fs_root(rc->extent_root->fs_info, root_objectid); | |
607 | BUG_ON(IS_ERR(root)); | |
608 | ||
609 | if (root->ref_cows && | |
610 | generation != btrfs_root_generation(&root->root_item)) | |
611 | return NULL; | |
612 | ||
613 | return root; | |
614 | } | |
615 | #endif | |
616 | ||
617 | static noinline_for_stack | |
618 | int find_inline_backref(struct extent_buffer *leaf, int slot, | |
619 | unsigned long *ptr, unsigned long *end) | |
620 | { | |
3173a18f | 621 | struct btrfs_key key; |
5d4f98a2 YZ |
622 | struct btrfs_extent_item *ei; |
623 | struct btrfs_tree_block_info *bi; | |
624 | u32 item_size; | |
625 | ||
3173a18f JB |
626 | btrfs_item_key_to_cpu(leaf, &key, slot); |
627 | ||
5d4f98a2 YZ |
628 | item_size = btrfs_item_size_nr(leaf, slot); |
629 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
630 | if (item_size < sizeof(*ei)) { | |
631 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
632 | return 1; | |
633 | } | |
634 | #endif | |
635 | ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); | |
636 | WARN_ON(!(btrfs_extent_flags(leaf, ei) & | |
637 | BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
638 | ||
3173a18f JB |
639 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
640 | item_size <= sizeof(*ei) + sizeof(*bi)) { | |
5d4f98a2 YZ |
641 | WARN_ON(item_size < sizeof(*ei) + sizeof(*bi)); |
642 | return 1; | |
643 | } | |
644 | ||
3173a18f JB |
645 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
646 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
647 | *ptr = (unsigned long)(bi + 1); | |
648 | } else { | |
649 | *ptr = (unsigned long)(ei + 1); | |
650 | } | |
5d4f98a2 YZ |
651 | *end = (unsigned long)ei + item_size; |
652 | return 0; | |
653 | } | |
654 | ||
655 | /* | |
656 | * build backref tree for a given tree block. root of the backref tree | |
657 | * corresponds the tree block, leaves of the backref tree correspond | |
658 | * roots of b-trees that reference the tree block. | |
659 | * | |
660 | * the basic idea of this function is check backrefs of a given block | |
661 | * to find upper level blocks that refernece the block, and then check | |
662 | * bakcrefs of these upper level blocks recursively. the recursion stop | |
663 | * when tree root is reached or backrefs for the block is cached. | |
664 | * | |
665 | * NOTE: if we find backrefs for a block are cached, we know backrefs | |
666 | * for all upper level blocks that directly/indirectly reference the | |
667 | * block are also cached. | |
668 | */ | |
3fd0a558 YZ |
669 | static noinline_for_stack |
670 | struct backref_node *build_backref_tree(struct reloc_control *rc, | |
671 | struct btrfs_key *node_key, | |
672 | int level, u64 bytenr) | |
5d4f98a2 | 673 | { |
3fd0a558 | 674 | struct backref_cache *cache = &rc->backref_cache; |
5d4f98a2 YZ |
675 | struct btrfs_path *path1; |
676 | struct btrfs_path *path2; | |
677 | struct extent_buffer *eb; | |
678 | struct btrfs_root *root; | |
679 | struct backref_node *cur; | |
680 | struct backref_node *upper; | |
681 | struct backref_node *lower; | |
682 | struct backref_node *node = NULL; | |
683 | struct backref_node *exist = NULL; | |
684 | struct backref_edge *edge; | |
685 | struct rb_node *rb_node; | |
686 | struct btrfs_key key; | |
687 | unsigned long end; | |
688 | unsigned long ptr; | |
689 | LIST_HEAD(list); | |
3fd0a558 YZ |
690 | LIST_HEAD(useless); |
691 | int cowonly; | |
5d4f98a2 YZ |
692 | int ret; |
693 | int err = 0; | |
694 | ||
695 | path1 = btrfs_alloc_path(); | |
696 | path2 = btrfs_alloc_path(); | |
697 | if (!path1 || !path2) { | |
698 | err = -ENOMEM; | |
699 | goto out; | |
700 | } | |
026fd317 JB |
701 | path1->reada = 1; |
702 | path2->reada = 2; | |
5d4f98a2 | 703 | |
3fd0a558 | 704 | node = alloc_backref_node(cache); |
5d4f98a2 YZ |
705 | if (!node) { |
706 | err = -ENOMEM; | |
707 | goto out; | |
708 | } | |
709 | ||
5d4f98a2 | 710 | node->bytenr = bytenr; |
5d4f98a2 YZ |
711 | node->level = level; |
712 | node->lowest = 1; | |
713 | cur = node; | |
714 | again: | |
715 | end = 0; | |
716 | ptr = 0; | |
717 | key.objectid = cur->bytenr; | |
3173a18f | 718 | key.type = BTRFS_METADATA_ITEM_KEY; |
5d4f98a2 YZ |
719 | key.offset = (u64)-1; |
720 | ||
721 | path1->search_commit_root = 1; | |
722 | path1->skip_locking = 1; | |
723 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path1, | |
724 | 0, 0); | |
725 | if (ret < 0) { | |
726 | err = ret; | |
727 | goto out; | |
728 | } | |
729 | BUG_ON(!ret || !path1->slots[0]); | |
730 | ||
731 | path1->slots[0]--; | |
732 | ||
733 | WARN_ON(cur->checked); | |
734 | if (!list_empty(&cur->upper)) { | |
735 | /* | |
70f23fd6 | 736 | * the backref was added previously when processing |
5d4f98a2 YZ |
737 | * backref of type BTRFS_TREE_BLOCK_REF_KEY |
738 | */ | |
739 | BUG_ON(!list_is_singular(&cur->upper)); | |
740 | edge = list_entry(cur->upper.next, struct backref_edge, | |
741 | list[LOWER]); | |
742 | BUG_ON(!list_empty(&edge->list[UPPER])); | |
743 | exist = edge->node[UPPER]; | |
744 | /* | |
745 | * add the upper level block to pending list if we need | |
746 | * check its backrefs | |
747 | */ | |
748 | if (!exist->checked) | |
749 | list_add_tail(&edge->list[UPPER], &list); | |
750 | } else { | |
751 | exist = NULL; | |
752 | } | |
753 | ||
754 | while (1) { | |
755 | cond_resched(); | |
756 | eb = path1->nodes[0]; | |
757 | ||
758 | if (ptr >= end) { | |
759 | if (path1->slots[0] >= btrfs_header_nritems(eb)) { | |
760 | ret = btrfs_next_leaf(rc->extent_root, path1); | |
761 | if (ret < 0) { | |
762 | err = ret; | |
763 | goto out; | |
764 | } | |
765 | if (ret > 0) | |
766 | break; | |
767 | eb = path1->nodes[0]; | |
768 | } | |
769 | ||
770 | btrfs_item_key_to_cpu(eb, &key, path1->slots[0]); | |
771 | if (key.objectid != cur->bytenr) { | |
772 | WARN_ON(exist); | |
773 | break; | |
774 | } | |
775 | ||
3173a18f JB |
776 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
777 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
5d4f98a2 YZ |
778 | ret = find_inline_backref(eb, path1->slots[0], |
779 | &ptr, &end); | |
780 | if (ret) | |
781 | goto next; | |
782 | } | |
783 | } | |
784 | ||
785 | if (ptr < end) { | |
786 | /* update key for inline back ref */ | |
787 | struct btrfs_extent_inline_ref *iref; | |
788 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
789 | key.type = btrfs_extent_inline_ref_type(eb, iref); | |
790 | key.offset = btrfs_extent_inline_ref_offset(eb, iref); | |
791 | WARN_ON(key.type != BTRFS_TREE_BLOCK_REF_KEY && | |
792 | key.type != BTRFS_SHARED_BLOCK_REF_KEY); | |
793 | } | |
794 | ||
795 | if (exist && | |
796 | ((key.type == BTRFS_TREE_BLOCK_REF_KEY && | |
797 | exist->owner == key.offset) || | |
798 | (key.type == BTRFS_SHARED_BLOCK_REF_KEY && | |
799 | exist->bytenr == key.offset))) { | |
800 | exist = NULL; | |
801 | goto next; | |
802 | } | |
803 | ||
804 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
805 | if (key.type == BTRFS_SHARED_BLOCK_REF_KEY || | |
806 | key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
3fd0a558 | 807 | if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
5d4f98a2 YZ |
808 | struct btrfs_extent_ref_v0 *ref0; |
809 | ref0 = btrfs_item_ptr(eb, path1->slots[0], | |
810 | struct btrfs_extent_ref_v0); | |
3fd0a558 | 811 | if (key.objectid == key.offset) { |
046f264f | 812 | root = find_tree_root(rc, eb, ref0); |
3fd0a558 YZ |
813 | if (root && !should_ignore_root(root)) |
814 | cur->root = root; | |
815 | else | |
816 | list_add(&cur->list, &useless); | |
817 | break; | |
818 | } | |
046f264f YZ |
819 | if (is_cowonly_root(btrfs_ref_root_v0(eb, |
820 | ref0))) | |
821 | cur->cowonly = 1; | |
5d4f98a2 YZ |
822 | } |
823 | #else | |
824 | BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); | |
825 | if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
826 | #endif | |
827 | if (key.objectid == key.offset) { | |
828 | /* | |
829 | * only root blocks of reloc trees use | |
830 | * backref of this type. | |
831 | */ | |
832 | root = find_reloc_root(rc, cur->bytenr); | |
833 | BUG_ON(!root); | |
834 | cur->root = root; | |
835 | break; | |
836 | } | |
837 | ||
3fd0a558 | 838 | edge = alloc_backref_edge(cache); |
5d4f98a2 YZ |
839 | if (!edge) { |
840 | err = -ENOMEM; | |
841 | goto out; | |
842 | } | |
843 | rb_node = tree_search(&cache->rb_root, key.offset); | |
844 | if (!rb_node) { | |
3fd0a558 | 845 | upper = alloc_backref_node(cache); |
5d4f98a2 | 846 | if (!upper) { |
3fd0a558 | 847 | free_backref_edge(cache, edge); |
5d4f98a2 YZ |
848 | err = -ENOMEM; |
849 | goto out; | |
850 | } | |
5d4f98a2 | 851 | upper->bytenr = key.offset; |
5d4f98a2 YZ |
852 | upper->level = cur->level + 1; |
853 | /* | |
854 | * backrefs for the upper level block isn't | |
855 | * cached, add the block to pending list | |
856 | */ | |
857 | list_add_tail(&edge->list[UPPER], &list); | |
858 | } else { | |
859 | upper = rb_entry(rb_node, struct backref_node, | |
860 | rb_node); | |
3fd0a558 | 861 | BUG_ON(!upper->checked); |
5d4f98a2 YZ |
862 | INIT_LIST_HEAD(&edge->list[UPPER]); |
863 | } | |
3fd0a558 | 864 | list_add_tail(&edge->list[LOWER], &cur->upper); |
5d4f98a2 | 865 | edge->node[LOWER] = cur; |
3fd0a558 | 866 | edge->node[UPPER] = upper; |
5d4f98a2 YZ |
867 | |
868 | goto next; | |
869 | } else if (key.type != BTRFS_TREE_BLOCK_REF_KEY) { | |
870 | goto next; | |
871 | } | |
872 | ||
873 | /* key.type == BTRFS_TREE_BLOCK_REF_KEY */ | |
874 | root = read_fs_root(rc->extent_root->fs_info, key.offset); | |
875 | if (IS_ERR(root)) { | |
876 | err = PTR_ERR(root); | |
877 | goto out; | |
878 | } | |
879 | ||
3fd0a558 YZ |
880 | if (!root->ref_cows) |
881 | cur->cowonly = 1; | |
882 | ||
5d4f98a2 YZ |
883 | if (btrfs_root_level(&root->root_item) == cur->level) { |
884 | /* tree root */ | |
885 | BUG_ON(btrfs_root_bytenr(&root->root_item) != | |
886 | cur->bytenr); | |
3fd0a558 YZ |
887 | if (should_ignore_root(root)) |
888 | list_add(&cur->list, &useless); | |
889 | else | |
890 | cur->root = root; | |
5d4f98a2 YZ |
891 | break; |
892 | } | |
893 | ||
894 | level = cur->level + 1; | |
895 | ||
896 | /* | |
897 | * searching the tree to find upper level blocks | |
898 | * reference the block. | |
899 | */ | |
900 | path2->search_commit_root = 1; | |
901 | path2->skip_locking = 1; | |
902 | path2->lowest_level = level; | |
903 | ret = btrfs_search_slot(NULL, root, node_key, path2, 0, 0); | |
904 | path2->lowest_level = 0; | |
905 | if (ret < 0) { | |
906 | err = ret; | |
907 | goto out; | |
908 | } | |
33c66f43 YZ |
909 | if (ret > 0 && path2->slots[level] > 0) |
910 | path2->slots[level]--; | |
5d4f98a2 YZ |
911 | |
912 | eb = path2->nodes[level]; | |
913 | WARN_ON(btrfs_node_blockptr(eb, path2->slots[level]) != | |
914 | cur->bytenr); | |
915 | ||
916 | lower = cur; | |
917 | for (; level < BTRFS_MAX_LEVEL; level++) { | |
918 | if (!path2->nodes[level]) { | |
919 | BUG_ON(btrfs_root_bytenr(&root->root_item) != | |
920 | lower->bytenr); | |
3fd0a558 YZ |
921 | if (should_ignore_root(root)) |
922 | list_add(&lower->list, &useless); | |
923 | else | |
924 | lower->root = root; | |
5d4f98a2 YZ |
925 | break; |
926 | } | |
927 | ||
3fd0a558 | 928 | edge = alloc_backref_edge(cache); |
5d4f98a2 YZ |
929 | if (!edge) { |
930 | err = -ENOMEM; | |
931 | goto out; | |
932 | } | |
933 | ||
934 | eb = path2->nodes[level]; | |
935 | rb_node = tree_search(&cache->rb_root, eb->start); | |
936 | if (!rb_node) { | |
3fd0a558 | 937 | upper = alloc_backref_node(cache); |
5d4f98a2 | 938 | if (!upper) { |
3fd0a558 | 939 | free_backref_edge(cache, edge); |
5d4f98a2 YZ |
940 | err = -ENOMEM; |
941 | goto out; | |
942 | } | |
5d4f98a2 YZ |
943 | upper->bytenr = eb->start; |
944 | upper->owner = btrfs_header_owner(eb); | |
945 | upper->level = lower->level + 1; | |
3fd0a558 YZ |
946 | if (!root->ref_cows) |
947 | upper->cowonly = 1; | |
5d4f98a2 YZ |
948 | |
949 | /* | |
950 | * if we know the block isn't shared | |
951 | * we can void checking its backrefs. | |
952 | */ | |
953 | if (btrfs_block_can_be_shared(root, eb)) | |
954 | upper->checked = 0; | |
955 | else | |
956 | upper->checked = 1; | |
957 | ||
958 | /* | |
959 | * add the block to pending list if we | |
960 | * need check its backrefs. only block | |
961 | * at 'cur->level + 1' is added to the | |
962 | * tail of pending list. this guarantees | |
963 | * we check backrefs from lower level | |
964 | * blocks to upper level blocks. | |
965 | */ | |
966 | if (!upper->checked && | |
967 | level == cur->level + 1) { | |
968 | list_add_tail(&edge->list[UPPER], | |
969 | &list); | |
970 | } else | |
971 | INIT_LIST_HEAD(&edge->list[UPPER]); | |
972 | } else { | |
973 | upper = rb_entry(rb_node, struct backref_node, | |
974 | rb_node); | |
975 | BUG_ON(!upper->checked); | |
976 | INIT_LIST_HEAD(&edge->list[UPPER]); | |
3fd0a558 YZ |
977 | if (!upper->owner) |
978 | upper->owner = btrfs_header_owner(eb); | |
5d4f98a2 YZ |
979 | } |
980 | list_add_tail(&edge->list[LOWER], &lower->upper); | |
5d4f98a2 | 981 | edge->node[LOWER] = lower; |
3fd0a558 | 982 | edge->node[UPPER] = upper; |
5d4f98a2 YZ |
983 | |
984 | if (rb_node) | |
985 | break; | |
986 | lower = upper; | |
987 | upper = NULL; | |
988 | } | |
b3b4aa74 | 989 | btrfs_release_path(path2); |
5d4f98a2 YZ |
990 | next: |
991 | if (ptr < end) { | |
992 | ptr += btrfs_extent_inline_ref_size(key.type); | |
993 | if (ptr >= end) { | |
994 | WARN_ON(ptr > end); | |
995 | ptr = 0; | |
996 | end = 0; | |
997 | } | |
998 | } | |
999 | if (ptr >= end) | |
1000 | path1->slots[0]++; | |
1001 | } | |
b3b4aa74 | 1002 | btrfs_release_path(path1); |
5d4f98a2 YZ |
1003 | |
1004 | cur->checked = 1; | |
1005 | WARN_ON(exist); | |
1006 | ||
1007 | /* the pending list isn't empty, take the first block to process */ | |
1008 | if (!list_empty(&list)) { | |
1009 | edge = list_entry(list.next, struct backref_edge, list[UPPER]); | |
1010 | list_del_init(&edge->list[UPPER]); | |
1011 | cur = edge->node[UPPER]; | |
1012 | goto again; | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * everything goes well, connect backref nodes and insert backref nodes | |
1017 | * into the cache. | |
1018 | */ | |
1019 | BUG_ON(!node->checked); | |
3fd0a558 YZ |
1020 | cowonly = node->cowonly; |
1021 | if (!cowonly) { | |
1022 | rb_node = tree_insert(&cache->rb_root, node->bytenr, | |
1023 | &node->rb_node); | |
43c04fb1 JM |
1024 | if (rb_node) |
1025 | backref_tree_panic(rb_node, -EEXIST, node->bytenr); | |
3fd0a558 YZ |
1026 | list_add_tail(&node->lower, &cache->leaves); |
1027 | } | |
5d4f98a2 YZ |
1028 | |
1029 | list_for_each_entry(edge, &node->upper, list[LOWER]) | |
1030 | list_add_tail(&edge->list[UPPER], &list); | |
1031 | ||
1032 | while (!list_empty(&list)) { | |
1033 | edge = list_entry(list.next, struct backref_edge, list[UPPER]); | |
1034 | list_del_init(&edge->list[UPPER]); | |
1035 | upper = edge->node[UPPER]; | |
3fd0a558 YZ |
1036 | if (upper->detached) { |
1037 | list_del(&edge->list[LOWER]); | |
1038 | lower = edge->node[LOWER]; | |
1039 | free_backref_edge(cache, edge); | |
1040 | if (list_empty(&lower->upper)) | |
1041 | list_add(&lower->list, &useless); | |
1042 | continue; | |
1043 | } | |
5d4f98a2 YZ |
1044 | |
1045 | if (!RB_EMPTY_NODE(&upper->rb_node)) { | |
1046 | if (upper->lowest) { | |
1047 | list_del_init(&upper->lower); | |
1048 | upper->lowest = 0; | |
1049 | } | |
1050 | ||
1051 | list_add_tail(&edge->list[UPPER], &upper->lower); | |
1052 | continue; | |
1053 | } | |
1054 | ||
1055 | BUG_ON(!upper->checked); | |
3fd0a558 YZ |
1056 | BUG_ON(cowonly != upper->cowonly); |
1057 | if (!cowonly) { | |
1058 | rb_node = tree_insert(&cache->rb_root, upper->bytenr, | |
1059 | &upper->rb_node); | |
43c04fb1 JM |
1060 | if (rb_node) |
1061 | backref_tree_panic(rb_node, -EEXIST, | |
1062 | upper->bytenr); | |
3fd0a558 | 1063 | } |
5d4f98a2 YZ |
1064 | |
1065 | list_add_tail(&edge->list[UPPER], &upper->lower); | |
1066 | ||
1067 | list_for_each_entry(edge, &upper->upper, list[LOWER]) | |
1068 | list_add_tail(&edge->list[UPPER], &list); | |
1069 | } | |
3fd0a558 YZ |
1070 | /* |
1071 | * process useless backref nodes. backref nodes for tree leaves | |
1072 | * are deleted from the cache. backref nodes for upper level | |
1073 | * tree blocks are left in the cache to avoid unnecessary backref | |
1074 | * lookup. | |
1075 | */ | |
1076 | while (!list_empty(&useless)) { | |
1077 | upper = list_entry(useless.next, struct backref_node, list); | |
1078 | list_del_init(&upper->list); | |
1079 | BUG_ON(!list_empty(&upper->upper)); | |
1080 | if (upper == node) | |
1081 | node = NULL; | |
1082 | if (upper->lowest) { | |
1083 | list_del_init(&upper->lower); | |
1084 | upper->lowest = 0; | |
1085 | } | |
1086 | while (!list_empty(&upper->lower)) { | |
1087 | edge = list_entry(upper->lower.next, | |
1088 | struct backref_edge, list[UPPER]); | |
1089 | list_del(&edge->list[UPPER]); | |
1090 | list_del(&edge->list[LOWER]); | |
1091 | lower = edge->node[LOWER]; | |
1092 | free_backref_edge(cache, edge); | |
1093 | ||
1094 | if (list_empty(&lower->upper)) | |
1095 | list_add(&lower->list, &useless); | |
1096 | } | |
1097 | __mark_block_processed(rc, upper); | |
1098 | if (upper->level > 0) { | |
1099 | list_add(&upper->list, &cache->detached); | |
1100 | upper->detached = 1; | |
1101 | } else { | |
1102 | rb_erase(&upper->rb_node, &cache->rb_root); | |
1103 | free_backref_node(cache, upper); | |
1104 | } | |
1105 | } | |
5d4f98a2 YZ |
1106 | out: |
1107 | btrfs_free_path(path1); | |
1108 | btrfs_free_path(path2); | |
1109 | if (err) { | |
3fd0a558 YZ |
1110 | while (!list_empty(&useless)) { |
1111 | lower = list_entry(useless.next, | |
1112 | struct backref_node, upper); | |
1113 | list_del_init(&lower->upper); | |
1114 | } | |
5d4f98a2 | 1115 | upper = node; |
3fd0a558 | 1116 | INIT_LIST_HEAD(&list); |
5d4f98a2 YZ |
1117 | while (upper) { |
1118 | if (RB_EMPTY_NODE(&upper->rb_node)) { | |
1119 | list_splice_tail(&upper->upper, &list); | |
3fd0a558 | 1120 | free_backref_node(cache, upper); |
5d4f98a2 YZ |
1121 | } |
1122 | ||
1123 | if (list_empty(&list)) | |
1124 | break; | |
1125 | ||
1126 | edge = list_entry(list.next, struct backref_edge, | |
1127 | list[LOWER]); | |
3fd0a558 | 1128 | list_del(&edge->list[LOWER]); |
5d4f98a2 | 1129 | upper = edge->node[UPPER]; |
3fd0a558 | 1130 | free_backref_edge(cache, edge); |
5d4f98a2 YZ |
1131 | } |
1132 | return ERR_PTR(err); | |
1133 | } | |
3fd0a558 | 1134 | BUG_ON(node && node->detached); |
5d4f98a2 YZ |
1135 | return node; |
1136 | } | |
1137 | ||
3fd0a558 YZ |
1138 | /* |
1139 | * helper to add backref node for the newly created snapshot. | |
1140 | * the backref node is created by cloning backref node that | |
1141 | * corresponds to root of source tree | |
1142 | */ | |
1143 | static int clone_backref_node(struct btrfs_trans_handle *trans, | |
1144 | struct reloc_control *rc, | |
1145 | struct btrfs_root *src, | |
1146 | struct btrfs_root *dest) | |
1147 | { | |
1148 | struct btrfs_root *reloc_root = src->reloc_root; | |
1149 | struct backref_cache *cache = &rc->backref_cache; | |
1150 | struct backref_node *node = NULL; | |
1151 | struct backref_node *new_node; | |
1152 | struct backref_edge *edge; | |
1153 | struct backref_edge *new_edge; | |
1154 | struct rb_node *rb_node; | |
1155 | ||
1156 | if (cache->last_trans > 0) | |
1157 | update_backref_cache(trans, cache); | |
1158 | ||
1159 | rb_node = tree_search(&cache->rb_root, src->commit_root->start); | |
1160 | if (rb_node) { | |
1161 | node = rb_entry(rb_node, struct backref_node, rb_node); | |
1162 | if (node->detached) | |
1163 | node = NULL; | |
1164 | else | |
1165 | BUG_ON(node->new_bytenr != reloc_root->node->start); | |
1166 | } | |
1167 | ||
1168 | if (!node) { | |
1169 | rb_node = tree_search(&cache->rb_root, | |
1170 | reloc_root->commit_root->start); | |
1171 | if (rb_node) { | |
1172 | node = rb_entry(rb_node, struct backref_node, | |
1173 | rb_node); | |
1174 | BUG_ON(node->detached); | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | if (!node) | |
1179 | return 0; | |
1180 | ||
1181 | new_node = alloc_backref_node(cache); | |
1182 | if (!new_node) | |
1183 | return -ENOMEM; | |
1184 | ||
1185 | new_node->bytenr = dest->node->start; | |
1186 | new_node->level = node->level; | |
1187 | new_node->lowest = node->lowest; | |
6848ad64 | 1188 | new_node->checked = 1; |
3fd0a558 YZ |
1189 | new_node->root = dest; |
1190 | ||
1191 | if (!node->lowest) { | |
1192 | list_for_each_entry(edge, &node->lower, list[UPPER]) { | |
1193 | new_edge = alloc_backref_edge(cache); | |
1194 | if (!new_edge) | |
1195 | goto fail; | |
1196 | ||
1197 | new_edge->node[UPPER] = new_node; | |
1198 | new_edge->node[LOWER] = edge->node[LOWER]; | |
1199 | list_add_tail(&new_edge->list[UPPER], | |
1200 | &new_node->lower); | |
1201 | } | |
76b9e23d MX |
1202 | } else { |
1203 | list_add_tail(&new_node->lower, &cache->leaves); | |
3fd0a558 YZ |
1204 | } |
1205 | ||
1206 | rb_node = tree_insert(&cache->rb_root, new_node->bytenr, | |
1207 | &new_node->rb_node); | |
43c04fb1 JM |
1208 | if (rb_node) |
1209 | backref_tree_panic(rb_node, -EEXIST, new_node->bytenr); | |
3fd0a558 YZ |
1210 | |
1211 | if (!new_node->lowest) { | |
1212 | list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) { | |
1213 | list_add_tail(&new_edge->list[LOWER], | |
1214 | &new_edge->node[LOWER]->upper); | |
1215 | } | |
1216 | } | |
1217 | return 0; | |
1218 | fail: | |
1219 | while (!list_empty(&new_node->lower)) { | |
1220 | new_edge = list_entry(new_node->lower.next, | |
1221 | struct backref_edge, list[UPPER]); | |
1222 | list_del(&new_edge->list[UPPER]); | |
1223 | free_backref_edge(cache, new_edge); | |
1224 | } | |
1225 | free_backref_node(cache, new_node); | |
1226 | return -ENOMEM; | |
1227 | } | |
1228 | ||
5d4f98a2 YZ |
1229 | /* |
1230 | * helper to add 'address of tree root -> reloc tree' mapping | |
1231 | */ | |
ffd7b339 | 1232 | static int __must_check __add_reloc_root(struct btrfs_root *root) |
5d4f98a2 YZ |
1233 | { |
1234 | struct rb_node *rb_node; | |
1235 | struct mapping_node *node; | |
1236 | struct reloc_control *rc = root->fs_info->reloc_ctl; | |
1237 | ||
1238 | node = kmalloc(sizeof(*node), GFP_NOFS); | |
ffd7b339 JM |
1239 | if (!node) |
1240 | return -ENOMEM; | |
5d4f98a2 YZ |
1241 | |
1242 | node->bytenr = root->node->start; | |
1243 | node->data = root; | |
1244 | ||
1245 | spin_lock(&rc->reloc_root_tree.lock); | |
1246 | rb_node = tree_insert(&rc->reloc_root_tree.rb_root, | |
1247 | node->bytenr, &node->rb_node); | |
1248 | spin_unlock(&rc->reloc_root_tree.lock); | |
ffd7b339 | 1249 | if (rb_node) { |
ffd7b339 JM |
1250 | btrfs_panic(root->fs_info, -EEXIST, "Duplicate root found " |
1251 | "for start=%llu while inserting into relocation " | |
533574c6 | 1252 | "tree\n", node->bytenr); |
23291a04 DC |
1253 | kfree(node); |
1254 | return -EEXIST; | |
ffd7b339 | 1255 | } |
5d4f98a2 YZ |
1256 | |
1257 | list_add_tail(&root->root_list, &rc->reloc_roots); | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * helper to update/delete the 'address of tree root -> reloc tree' | |
1263 | * mapping | |
1264 | */ | |
1265 | static int __update_reloc_root(struct btrfs_root *root, int del) | |
1266 | { | |
1267 | struct rb_node *rb_node; | |
1268 | struct mapping_node *node = NULL; | |
1269 | struct reloc_control *rc = root->fs_info->reloc_ctl; | |
1270 | ||
1271 | spin_lock(&rc->reloc_root_tree.lock); | |
1272 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, | |
1273 | root->commit_root->start); | |
1274 | if (rb_node) { | |
1275 | node = rb_entry(rb_node, struct mapping_node, rb_node); | |
1276 | rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); | |
1277 | } | |
1278 | spin_unlock(&rc->reloc_root_tree.lock); | |
1279 | ||
8f71f3e0 LB |
1280 | if (!node) |
1281 | return 0; | |
5d4f98a2 YZ |
1282 | BUG_ON((struct btrfs_root *)node->data != root); |
1283 | ||
1284 | if (!del) { | |
1285 | spin_lock(&rc->reloc_root_tree.lock); | |
1286 | node->bytenr = root->node->start; | |
1287 | rb_node = tree_insert(&rc->reloc_root_tree.rb_root, | |
1288 | node->bytenr, &node->rb_node); | |
1289 | spin_unlock(&rc->reloc_root_tree.lock); | |
43c04fb1 JM |
1290 | if (rb_node) |
1291 | backref_tree_panic(rb_node, -EEXIST, node->bytenr); | |
5d4f98a2 | 1292 | } else { |
1daf3540 | 1293 | spin_lock(&root->fs_info->trans_lock); |
5d4f98a2 | 1294 | list_del_init(&root->root_list); |
1daf3540 | 1295 | spin_unlock(&root->fs_info->trans_lock); |
5d4f98a2 YZ |
1296 | kfree(node); |
1297 | } | |
1298 | return 0; | |
1299 | } | |
1300 | ||
3fd0a558 YZ |
1301 | static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans, |
1302 | struct btrfs_root *root, u64 objectid) | |
5d4f98a2 YZ |
1303 | { |
1304 | struct btrfs_root *reloc_root; | |
1305 | struct extent_buffer *eb; | |
1306 | struct btrfs_root_item *root_item; | |
1307 | struct btrfs_key root_key; | |
5bc7247a | 1308 | u64 last_snap = 0; |
5d4f98a2 YZ |
1309 | int ret; |
1310 | ||
5d4f98a2 YZ |
1311 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); |
1312 | BUG_ON(!root_item); | |
1313 | ||
1314 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
1315 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
3fd0a558 | 1316 | root_key.offset = objectid; |
5d4f98a2 | 1317 | |
3fd0a558 YZ |
1318 | if (root->root_key.objectid == objectid) { |
1319 | /* called by btrfs_init_reloc_root */ | |
1320 | ret = btrfs_copy_root(trans, root, root->commit_root, &eb, | |
1321 | BTRFS_TREE_RELOC_OBJECTID); | |
1322 | BUG_ON(ret); | |
1323 | ||
5bc7247a | 1324 | last_snap = btrfs_root_last_snapshot(&root->root_item); |
3fd0a558 YZ |
1325 | btrfs_set_root_last_snapshot(&root->root_item, |
1326 | trans->transid - 1); | |
1327 | } else { | |
1328 | /* | |
1329 | * called by btrfs_reloc_post_snapshot_hook. | |
1330 | * the source tree is a reloc tree, all tree blocks | |
1331 | * modified after it was created have RELOC flag | |
1332 | * set in their headers. so it's OK to not update | |
1333 | * the 'last_snapshot'. | |
1334 | */ | |
1335 | ret = btrfs_copy_root(trans, root, root->node, &eb, | |
1336 | BTRFS_TREE_RELOC_OBJECTID); | |
1337 | BUG_ON(ret); | |
1338 | } | |
5d4f98a2 | 1339 | |
5d4f98a2 | 1340 | memcpy(root_item, &root->root_item, sizeof(*root_item)); |
5d4f98a2 YZ |
1341 | btrfs_set_root_bytenr(root_item, eb->start); |
1342 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
1343 | btrfs_set_root_generation(root_item, trans->transid); | |
3fd0a558 YZ |
1344 | |
1345 | if (root->root_key.objectid == objectid) { | |
1346 | btrfs_set_root_refs(root_item, 0); | |
1347 | memset(&root_item->drop_progress, 0, | |
1348 | sizeof(struct btrfs_disk_key)); | |
1349 | root_item->drop_level = 0; | |
5bc7247a MX |
1350 | /* |
1351 | * abuse rtransid, it is safe because it is impossible to | |
1352 | * receive data into a relocation tree. | |
1353 | */ | |
1354 | btrfs_set_root_rtransid(root_item, last_snap); | |
1355 | btrfs_set_root_otransid(root_item, trans->transid); | |
3fd0a558 | 1356 | } |
5d4f98a2 YZ |
1357 | |
1358 | btrfs_tree_unlock(eb); | |
1359 | free_extent_buffer(eb); | |
1360 | ||
1361 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, | |
1362 | &root_key, root_item); | |
1363 | BUG_ON(ret); | |
1364 | kfree(root_item); | |
1365 | ||
cb517eab | 1366 | reloc_root = btrfs_read_fs_root(root->fs_info->tree_root, &root_key); |
5d4f98a2 YZ |
1367 | BUG_ON(IS_ERR(reloc_root)); |
1368 | reloc_root->last_trans = trans->transid; | |
3fd0a558 YZ |
1369 | return reloc_root; |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * create reloc tree for a given fs tree. reloc tree is just a | |
1374 | * snapshot of the fs tree with special root objectid. | |
1375 | */ | |
1376 | int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, | |
1377 | struct btrfs_root *root) | |
1378 | { | |
1379 | struct btrfs_root *reloc_root; | |
1380 | struct reloc_control *rc = root->fs_info->reloc_ctl; | |
1381 | int clear_rsv = 0; | |
ffd7b339 | 1382 | int ret; |
3fd0a558 YZ |
1383 | |
1384 | if (root->reloc_root) { | |
1385 | reloc_root = root->reloc_root; | |
1386 | reloc_root->last_trans = trans->transid; | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | if (!rc || !rc->create_reloc_tree || | |
1391 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) | |
1392 | return 0; | |
1393 | ||
1394 | if (!trans->block_rsv) { | |
1395 | trans->block_rsv = rc->block_rsv; | |
1396 | clear_rsv = 1; | |
1397 | } | |
1398 | reloc_root = create_reloc_root(trans, root, root->root_key.objectid); | |
1399 | if (clear_rsv) | |
1400 | trans->block_rsv = NULL; | |
5d4f98a2 | 1401 | |
ffd7b339 JM |
1402 | ret = __add_reloc_root(reloc_root); |
1403 | BUG_ON(ret < 0); | |
5d4f98a2 YZ |
1404 | root->reloc_root = reloc_root; |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | /* | |
1409 | * update root item of reloc tree | |
1410 | */ | |
1411 | int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, | |
1412 | struct btrfs_root *root) | |
1413 | { | |
1414 | struct btrfs_root *reloc_root; | |
1415 | struct btrfs_root_item *root_item; | |
1416 | int del = 0; | |
1417 | int ret; | |
1418 | ||
1419 | if (!root->reloc_root) | |
7585717f | 1420 | goto out; |
5d4f98a2 YZ |
1421 | |
1422 | reloc_root = root->reloc_root; | |
1423 | root_item = &reloc_root->root_item; | |
1424 | ||
3fd0a558 YZ |
1425 | if (root->fs_info->reloc_ctl->merge_reloc_tree && |
1426 | btrfs_root_refs(root_item) == 0) { | |
5d4f98a2 YZ |
1427 | root->reloc_root = NULL; |
1428 | del = 1; | |
1429 | } | |
1430 | ||
1431 | __update_reloc_root(reloc_root, del); | |
1432 | ||
1433 | if (reloc_root->commit_root != reloc_root->node) { | |
1434 | btrfs_set_root_node(root_item, reloc_root->node); | |
1435 | free_extent_buffer(reloc_root->commit_root); | |
1436 | reloc_root->commit_root = btrfs_root_node(reloc_root); | |
1437 | } | |
1438 | ||
1439 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
1440 | &reloc_root->root_key, root_item); | |
1441 | BUG_ON(ret); | |
7585717f CM |
1442 | |
1443 | out: | |
5d4f98a2 YZ |
1444 | return 0; |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * helper to find first cached inode with inode number >= objectid | |
1449 | * in a subvolume | |
1450 | */ | |
1451 | static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) | |
1452 | { | |
1453 | struct rb_node *node; | |
1454 | struct rb_node *prev; | |
1455 | struct btrfs_inode *entry; | |
1456 | struct inode *inode; | |
1457 | ||
1458 | spin_lock(&root->inode_lock); | |
1459 | again: | |
1460 | node = root->inode_tree.rb_node; | |
1461 | prev = NULL; | |
1462 | while (node) { | |
1463 | prev = node; | |
1464 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
1465 | ||
33345d01 | 1466 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
5d4f98a2 | 1467 | node = node->rb_left; |
33345d01 | 1468 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
5d4f98a2 YZ |
1469 | node = node->rb_right; |
1470 | else | |
1471 | break; | |
1472 | } | |
1473 | if (!node) { | |
1474 | while (prev) { | |
1475 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
33345d01 | 1476 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
5d4f98a2 YZ |
1477 | node = prev; |
1478 | break; | |
1479 | } | |
1480 | prev = rb_next(prev); | |
1481 | } | |
1482 | } | |
1483 | while (node) { | |
1484 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
1485 | inode = igrab(&entry->vfs_inode); | |
1486 | if (inode) { | |
1487 | spin_unlock(&root->inode_lock); | |
1488 | return inode; | |
1489 | } | |
1490 | ||
33345d01 | 1491 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
5d4f98a2 YZ |
1492 | if (cond_resched_lock(&root->inode_lock)) |
1493 | goto again; | |
1494 | ||
1495 | node = rb_next(node); | |
1496 | } | |
1497 | spin_unlock(&root->inode_lock); | |
1498 | return NULL; | |
1499 | } | |
1500 | ||
1501 | static int in_block_group(u64 bytenr, | |
1502 | struct btrfs_block_group_cache *block_group) | |
1503 | { | |
1504 | if (bytenr >= block_group->key.objectid && | |
1505 | bytenr < block_group->key.objectid + block_group->key.offset) | |
1506 | return 1; | |
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * get new location of data | |
1512 | */ | |
1513 | static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, | |
1514 | u64 bytenr, u64 num_bytes) | |
1515 | { | |
1516 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
1517 | struct btrfs_path *path; | |
1518 | struct btrfs_file_extent_item *fi; | |
1519 | struct extent_buffer *leaf; | |
1520 | int ret; | |
1521 | ||
1522 | path = btrfs_alloc_path(); | |
1523 | if (!path) | |
1524 | return -ENOMEM; | |
1525 | ||
1526 | bytenr -= BTRFS_I(reloc_inode)->index_cnt; | |
33345d01 | 1527 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(reloc_inode), |
5d4f98a2 YZ |
1528 | bytenr, 0); |
1529 | if (ret < 0) | |
1530 | goto out; | |
1531 | if (ret > 0) { | |
1532 | ret = -ENOENT; | |
1533 | goto out; | |
1534 | } | |
1535 | ||
1536 | leaf = path->nodes[0]; | |
1537 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1538 | struct btrfs_file_extent_item); | |
1539 | ||
1540 | BUG_ON(btrfs_file_extent_offset(leaf, fi) || | |
1541 | btrfs_file_extent_compression(leaf, fi) || | |
1542 | btrfs_file_extent_encryption(leaf, fi) || | |
1543 | btrfs_file_extent_other_encoding(leaf, fi)); | |
1544 | ||
1545 | if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { | |
1546 | ret = 1; | |
1547 | goto out; | |
1548 | } | |
1549 | ||
3fd0a558 | 1550 | *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 YZ |
1551 | ret = 0; |
1552 | out: | |
1553 | btrfs_free_path(path); | |
1554 | return ret; | |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * update file extent items in the tree leaf to point to | |
1559 | * the new locations. | |
1560 | */ | |
3fd0a558 YZ |
1561 | static noinline_for_stack |
1562 | int replace_file_extents(struct btrfs_trans_handle *trans, | |
1563 | struct reloc_control *rc, | |
1564 | struct btrfs_root *root, | |
1565 | struct extent_buffer *leaf) | |
5d4f98a2 YZ |
1566 | { |
1567 | struct btrfs_key key; | |
1568 | struct btrfs_file_extent_item *fi; | |
1569 | struct inode *inode = NULL; | |
5d4f98a2 YZ |
1570 | u64 parent; |
1571 | u64 bytenr; | |
3fd0a558 | 1572 | u64 new_bytenr = 0; |
5d4f98a2 YZ |
1573 | u64 num_bytes; |
1574 | u64 end; | |
1575 | u32 nritems; | |
1576 | u32 i; | |
1577 | int ret; | |
1578 | int first = 1; | |
1579 | int dirty = 0; | |
1580 | ||
1581 | if (rc->stage != UPDATE_DATA_PTRS) | |
1582 | return 0; | |
1583 | ||
1584 | /* reloc trees always use full backref */ | |
1585 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) | |
1586 | parent = leaf->start; | |
1587 | else | |
1588 | parent = 0; | |
1589 | ||
1590 | nritems = btrfs_header_nritems(leaf); | |
1591 | for (i = 0; i < nritems; i++) { | |
1592 | cond_resched(); | |
1593 | btrfs_item_key_to_cpu(leaf, &key, i); | |
1594 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
1595 | continue; | |
1596 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
1597 | if (btrfs_file_extent_type(leaf, fi) == | |
1598 | BTRFS_FILE_EXTENT_INLINE) | |
1599 | continue; | |
1600 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
1601 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
1602 | if (bytenr == 0) | |
1603 | continue; | |
1604 | if (!in_block_group(bytenr, rc->block_group)) | |
1605 | continue; | |
1606 | ||
1607 | /* | |
1608 | * if we are modifying block in fs tree, wait for readpage | |
1609 | * to complete and drop the extent cache | |
1610 | */ | |
1611 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { | |
5d4f98a2 YZ |
1612 | if (first) { |
1613 | inode = find_next_inode(root, key.objectid); | |
5d4f98a2 | 1614 | first = 0; |
33345d01 | 1615 | } else if (inode && btrfs_ino(inode) < key.objectid) { |
3fd0a558 | 1616 | btrfs_add_delayed_iput(inode); |
5d4f98a2 | 1617 | inode = find_next_inode(root, key.objectid); |
5d4f98a2 | 1618 | } |
33345d01 | 1619 | if (inode && btrfs_ino(inode) == key.objectid) { |
5d4f98a2 YZ |
1620 | end = key.offset + |
1621 | btrfs_file_extent_num_bytes(leaf, fi); | |
1622 | WARN_ON(!IS_ALIGNED(key.offset, | |
1623 | root->sectorsize)); | |
1624 | WARN_ON(!IS_ALIGNED(end, root->sectorsize)); | |
1625 | end--; | |
1626 | ret = try_lock_extent(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1627 | key.offset, end); |
5d4f98a2 YZ |
1628 | if (!ret) |
1629 | continue; | |
1630 | ||
1631 | btrfs_drop_extent_cache(inode, key.offset, end, | |
1632 | 1); | |
1633 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1634 | key.offset, end); |
5d4f98a2 YZ |
1635 | } |
1636 | } | |
1637 | ||
1638 | ret = get_new_location(rc->data_inode, &new_bytenr, | |
1639 | bytenr, num_bytes); | |
3fd0a558 YZ |
1640 | if (ret > 0) { |
1641 | WARN_ON(1); | |
5d4f98a2 | 1642 | continue; |
3fd0a558 | 1643 | } |
5d4f98a2 YZ |
1644 | BUG_ON(ret < 0); |
1645 | ||
1646 | btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); | |
1647 | dirty = 1; | |
1648 | ||
1649 | key.offset -= btrfs_file_extent_offset(leaf, fi); | |
1650 | ret = btrfs_inc_extent_ref(trans, root, new_bytenr, | |
1651 | num_bytes, parent, | |
1652 | btrfs_header_owner(leaf), | |
66d7e7f0 | 1653 | key.objectid, key.offset, 1); |
5d4f98a2 YZ |
1654 | BUG_ON(ret); |
1655 | ||
1656 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, | |
1657 | parent, btrfs_header_owner(leaf), | |
66d7e7f0 | 1658 | key.objectid, key.offset, 1); |
5d4f98a2 YZ |
1659 | BUG_ON(ret); |
1660 | } | |
1661 | if (dirty) | |
1662 | btrfs_mark_buffer_dirty(leaf); | |
3fd0a558 YZ |
1663 | if (inode) |
1664 | btrfs_add_delayed_iput(inode); | |
5d4f98a2 YZ |
1665 | return 0; |
1666 | } | |
1667 | ||
1668 | static noinline_for_stack | |
1669 | int memcmp_node_keys(struct extent_buffer *eb, int slot, | |
1670 | struct btrfs_path *path, int level) | |
1671 | { | |
1672 | struct btrfs_disk_key key1; | |
1673 | struct btrfs_disk_key key2; | |
1674 | btrfs_node_key(eb, &key1, slot); | |
1675 | btrfs_node_key(path->nodes[level], &key2, path->slots[level]); | |
1676 | return memcmp(&key1, &key2, sizeof(key1)); | |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * try to replace tree blocks in fs tree with the new blocks | |
1681 | * in reloc tree. tree blocks haven't been modified since the | |
1682 | * reloc tree was create can be replaced. | |
1683 | * | |
1684 | * if a block was replaced, level of the block + 1 is returned. | |
1685 | * if no block got replaced, 0 is returned. if there are other | |
1686 | * errors, a negative error number is returned. | |
1687 | */ | |
3fd0a558 YZ |
1688 | static noinline_for_stack |
1689 | int replace_path(struct btrfs_trans_handle *trans, | |
1690 | struct btrfs_root *dest, struct btrfs_root *src, | |
1691 | struct btrfs_path *path, struct btrfs_key *next_key, | |
1692 | int lowest_level, int max_level) | |
5d4f98a2 YZ |
1693 | { |
1694 | struct extent_buffer *eb; | |
1695 | struct extent_buffer *parent; | |
1696 | struct btrfs_key key; | |
1697 | u64 old_bytenr; | |
1698 | u64 new_bytenr; | |
1699 | u64 old_ptr_gen; | |
1700 | u64 new_ptr_gen; | |
1701 | u64 last_snapshot; | |
1702 | u32 blocksize; | |
3fd0a558 | 1703 | int cow = 0; |
5d4f98a2 YZ |
1704 | int level; |
1705 | int ret; | |
1706 | int slot; | |
1707 | ||
1708 | BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
1709 | BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); | |
5d4f98a2 YZ |
1710 | |
1711 | last_snapshot = btrfs_root_last_snapshot(&src->root_item); | |
3fd0a558 | 1712 | again: |
5d4f98a2 YZ |
1713 | slot = path->slots[lowest_level]; |
1714 | btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); | |
1715 | ||
1716 | eb = btrfs_lock_root_node(dest); | |
1717 | btrfs_set_lock_blocking(eb); | |
1718 | level = btrfs_header_level(eb); | |
1719 | ||
1720 | if (level < lowest_level) { | |
1721 | btrfs_tree_unlock(eb); | |
1722 | free_extent_buffer(eb); | |
1723 | return 0; | |
1724 | } | |
1725 | ||
3fd0a558 YZ |
1726 | if (cow) { |
1727 | ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); | |
1728 | BUG_ON(ret); | |
1729 | } | |
5d4f98a2 YZ |
1730 | btrfs_set_lock_blocking(eb); |
1731 | ||
1732 | if (next_key) { | |
1733 | next_key->objectid = (u64)-1; | |
1734 | next_key->type = (u8)-1; | |
1735 | next_key->offset = (u64)-1; | |
1736 | } | |
1737 | ||
1738 | parent = eb; | |
1739 | while (1) { | |
1740 | level = btrfs_header_level(parent); | |
1741 | BUG_ON(level < lowest_level); | |
1742 | ||
1743 | ret = btrfs_bin_search(parent, &key, level, &slot); | |
1744 | if (ret && slot > 0) | |
1745 | slot--; | |
1746 | ||
1747 | if (next_key && slot + 1 < btrfs_header_nritems(parent)) | |
1748 | btrfs_node_key_to_cpu(parent, next_key, slot + 1); | |
1749 | ||
1750 | old_bytenr = btrfs_node_blockptr(parent, slot); | |
1751 | blocksize = btrfs_level_size(dest, level - 1); | |
1752 | old_ptr_gen = btrfs_node_ptr_generation(parent, slot); | |
1753 | ||
1754 | if (level <= max_level) { | |
1755 | eb = path->nodes[level]; | |
1756 | new_bytenr = btrfs_node_blockptr(eb, | |
1757 | path->slots[level]); | |
1758 | new_ptr_gen = btrfs_node_ptr_generation(eb, | |
1759 | path->slots[level]); | |
1760 | } else { | |
1761 | new_bytenr = 0; | |
1762 | new_ptr_gen = 0; | |
1763 | } | |
1764 | ||
1765 | if (new_bytenr > 0 && new_bytenr == old_bytenr) { | |
1766 | WARN_ON(1); | |
1767 | ret = level; | |
1768 | break; | |
1769 | } | |
1770 | ||
1771 | if (new_bytenr == 0 || old_ptr_gen > last_snapshot || | |
1772 | memcmp_node_keys(parent, slot, path, level)) { | |
3fd0a558 | 1773 | if (level <= lowest_level) { |
5d4f98a2 YZ |
1774 | ret = 0; |
1775 | break; | |
1776 | } | |
1777 | ||
1778 | eb = read_tree_block(dest, old_bytenr, blocksize, | |
1779 | old_ptr_gen); | |
416bc658 JB |
1780 | if (!eb || !extent_buffer_uptodate(eb)) { |
1781 | ret = (!eb) ? -ENOMEM : -EIO; | |
1782 | free_extent_buffer(eb); | |
379cde74 | 1783 | break; |
416bc658 | 1784 | } |
5d4f98a2 | 1785 | btrfs_tree_lock(eb); |
3fd0a558 YZ |
1786 | if (cow) { |
1787 | ret = btrfs_cow_block(trans, dest, eb, parent, | |
1788 | slot, &eb); | |
1789 | BUG_ON(ret); | |
5d4f98a2 | 1790 | } |
3fd0a558 | 1791 | btrfs_set_lock_blocking(eb); |
5d4f98a2 YZ |
1792 | |
1793 | btrfs_tree_unlock(parent); | |
1794 | free_extent_buffer(parent); | |
1795 | ||
1796 | parent = eb; | |
1797 | continue; | |
1798 | } | |
1799 | ||
3fd0a558 YZ |
1800 | if (!cow) { |
1801 | btrfs_tree_unlock(parent); | |
1802 | free_extent_buffer(parent); | |
1803 | cow = 1; | |
1804 | goto again; | |
1805 | } | |
1806 | ||
5d4f98a2 YZ |
1807 | btrfs_node_key_to_cpu(path->nodes[level], &key, |
1808 | path->slots[level]); | |
b3b4aa74 | 1809 | btrfs_release_path(path); |
5d4f98a2 YZ |
1810 | |
1811 | path->lowest_level = level; | |
1812 | ret = btrfs_search_slot(trans, src, &key, path, 0, 1); | |
1813 | path->lowest_level = 0; | |
1814 | BUG_ON(ret); | |
1815 | ||
1816 | /* | |
1817 | * swap blocks in fs tree and reloc tree. | |
1818 | */ | |
1819 | btrfs_set_node_blockptr(parent, slot, new_bytenr); | |
1820 | btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); | |
1821 | btrfs_mark_buffer_dirty(parent); | |
1822 | ||
1823 | btrfs_set_node_blockptr(path->nodes[level], | |
1824 | path->slots[level], old_bytenr); | |
1825 | btrfs_set_node_ptr_generation(path->nodes[level], | |
1826 | path->slots[level], old_ptr_gen); | |
1827 | btrfs_mark_buffer_dirty(path->nodes[level]); | |
1828 | ||
1829 | ret = btrfs_inc_extent_ref(trans, src, old_bytenr, blocksize, | |
1830 | path->nodes[level]->start, | |
66d7e7f0 AJ |
1831 | src->root_key.objectid, level - 1, 0, |
1832 | 1); | |
5d4f98a2 YZ |
1833 | BUG_ON(ret); |
1834 | ret = btrfs_inc_extent_ref(trans, dest, new_bytenr, blocksize, | |
1835 | 0, dest->root_key.objectid, level - 1, | |
66d7e7f0 | 1836 | 0, 1); |
5d4f98a2 YZ |
1837 | BUG_ON(ret); |
1838 | ||
1839 | ret = btrfs_free_extent(trans, src, new_bytenr, blocksize, | |
1840 | path->nodes[level]->start, | |
66d7e7f0 AJ |
1841 | src->root_key.objectid, level - 1, 0, |
1842 | 1); | |
5d4f98a2 YZ |
1843 | BUG_ON(ret); |
1844 | ||
1845 | ret = btrfs_free_extent(trans, dest, old_bytenr, blocksize, | |
1846 | 0, dest->root_key.objectid, level - 1, | |
66d7e7f0 | 1847 | 0, 1); |
5d4f98a2 YZ |
1848 | BUG_ON(ret); |
1849 | ||
1850 | btrfs_unlock_up_safe(path, 0); | |
1851 | ||
1852 | ret = level; | |
1853 | break; | |
1854 | } | |
1855 | btrfs_tree_unlock(parent); | |
1856 | free_extent_buffer(parent); | |
1857 | return ret; | |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * helper to find next relocated block in reloc tree | |
1862 | */ | |
1863 | static noinline_for_stack | |
1864 | int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, | |
1865 | int *level) | |
1866 | { | |
1867 | struct extent_buffer *eb; | |
1868 | int i; | |
1869 | u64 last_snapshot; | |
1870 | u32 nritems; | |
1871 | ||
1872 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); | |
1873 | ||
1874 | for (i = 0; i < *level; i++) { | |
1875 | free_extent_buffer(path->nodes[i]); | |
1876 | path->nodes[i] = NULL; | |
1877 | } | |
1878 | ||
1879 | for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { | |
1880 | eb = path->nodes[i]; | |
1881 | nritems = btrfs_header_nritems(eb); | |
1882 | while (path->slots[i] + 1 < nritems) { | |
1883 | path->slots[i]++; | |
1884 | if (btrfs_node_ptr_generation(eb, path->slots[i]) <= | |
1885 | last_snapshot) | |
1886 | continue; | |
1887 | ||
1888 | *level = i; | |
1889 | return 0; | |
1890 | } | |
1891 | free_extent_buffer(path->nodes[i]); | |
1892 | path->nodes[i] = NULL; | |
1893 | } | |
1894 | return 1; | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * walk down reloc tree to find relocated block of lowest level | |
1899 | */ | |
1900 | static noinline_for_stack | |
1901 | int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, | |
1902 | int *level) | |
1903 | { | |
1904 | struct extent_buffer *eb = NULL; | |
1905 | int i; | |
1906 | u64 bytenr; | |
1907 | u64 ptr_gen = 0; | |
1908 | u64 last_snapshot; | |
1909 | u32 blocksize; | |
1910 | u32 nritems; | |
1911 | ||
1912 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); | |
1913 | ||
1914 | for (i = *level; i > 0; i--) { | |
1915 | eb = path->nodes[i]; | |
1916 | nritems = btrfs_header_nritems(eb); | |
1917 | while (path->slots[i] < nritems) { | |
1918 | ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); | |
1919 | if (ptr_gen > last_snapshot) | |
1920 | break; | |
1921 | path->slots[i]++; | |
1922 | } | |
1923 | if (path->slots[i] >= nritems) { | |
1924 | if (i == *level) | |
1925 | break; | |
1926 | *level = i + 1; | |
1927 | return 0; | |
1928 | } | |
1929 | if (i == 1) { | |
1930 | *level = i; | |
1931 | return 0; | |
1932 | } | |
1933 | ||
1934 | bytenr = btrfs_node_blockptr(eb, path->slots[i]); | |
1935 | blocksize = btrfs_level_size(root, i - 1); | |
1936 | eb = read_tree_block(root, bytenr, blocksize, ptr_gen); | |
416bc658 JB |
1937 | if (!eb || !extent_buffer_uptodate(eb)) { |
1938 | free_extent_buffer(eb); | |
1939 | return -EIO; | |
1940 | } | |
5d4f98a2 YZ |
1941 | BUG_ON(btrfs_header_level(eb) != i - 1); |
1942 | path->nodes[i - 1] = eb; | |
1943 | path->slots[i - 1] = 0; | |
1944 | } | |
1945 | return 1; | |
1946 | } | |
1947 | ||
1948 | /* | |
1949 | * invalidate extent cache for file extents whose key in range of | |
1950 | * [min_key, max_key) | |
1951 | */ | |
1952 | static int invalidate_extent_cache(struct btrfs_root *root, | |
1953 | struct btrfs_key *min_key, | |
1954 | struct btrfs_key *max_key) | |
1955 | { | |
1956 | struct inode *inode = NULL; | |
1957 | u64 objectid; | |
1958 | u64 start, end; | |
33345d01 | 1959 | u64 ino; |
5d4f98a2 YZ |
1960 | |
1961 | objectid = min_key->objectid; | |
1962 | while (1) { | |
1963 | cond_resched(); | |
1964 | iput(inode); | |
1965 | ||
1966 | if (objectid > max_key->objectid) | |
1967 | break; | |
1968 | ||
1969 | inode = find_next_inode(root, objectid); | |
1970 | if (!inode) | |
1971 | break; | |
33345d01 | 1972 | ino = btrfs_ino(inode); |
5d4f98a2 | 1973 | |
33345d01 | 1974 | if (ino > max_key->objectid) { |
5d4f98a2 YZ |
1975 | iput(inode); |
1976 | break; | |
1977 | } | |
1978 | ||
33345d01 | 1979 | objectid = ino + 1; |
5d4f98a2 YZ |
1980 | if (!S_ISREG(inode->i_mode)) |
1981 | continue; | |
1982 | ||
33345d01 | 1983 | if (unlikely(min_key->objectid == ino)) { |
5d4f98a2 YZ |
1984 | if (min_key->type > BTRFS_EXTENT_DATA_KEY) |
1985 | continue; | |
1986 | if (min_key->type < BTRFS_EXTENT_DATA_KEY) | |
1987 | start = 0; | |
1988 | else { | |
1989 | start = min_key->offset; | |
1990 | WARN_ON(!IS_ALIGNED(start, root->sectorsize)); | |
1991 | } | |
1992 | } else { | |
1993 | start = 0; | |
1994 | } | |
1995 | ||
33345d01 | 1996 | if (unlikely(max_key->objectid == ino)) { |
5d4f98a2 YZ |
1997 | if (max_key->type < BTRFS_EXTENT_DATA_KEY) |
1998 | continue; | |
1999 | if (max_key->type > BTRFS_EXTENT_DATA_KEY) { | |
2000 | end = (u64)-1; | |
2001 | } else { | |
2002 | if (max_key->offset == 0) | |
2003 | continue; | |
2004 | end = max_key->offset; | |
2005 | WARN_ON(!IS_ALIGNED(end, root->sectorsize)); | |
2006 | end--; | |
2007 | } | |
2008 | } else { | |
2009 | end = (u64)-1; | |
2010 | } | |
2011 | ||
2012 | /* the lock_extent waits for readpage to complete */ | |
d0082371 | 2013 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
5d4f98a2 | 2014 | btrfs_drop_extent_cache(inode, start, end, 1); |
d0082371 | 2015 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
5d4f98a2 YZ |
2016 | } |
2017 | return 0; | |
2018 | } | |
2019 | ||
2020 | static int find_next_key(struct btrfs_path *path, int level, | |
2021 | struct btrfs_key *key) | |
2022 | ||
2023 | { | |
2024 | while (level < BTRFS_MAX_LEVEL) { | |
2025 | if (!path->nodes[level]) | |
2026 | break; | |
2027 | if (path->slots[level] + 1 < | |
2028 | btrfs_header_nritems(path->nodes[level])) { | |
2029 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
2030 | path->slots[level] + 1); | |
2031 | return 0; | |
2032 | } | |
2033 | level++; | |
2034 | } | |
2035 | return 1; | |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * merge the relocated tree blocks in reloc tree with corresponding | |
2040 | * fs tree. | |
2041 | */ | |
2042 | static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, | |
2043 | struct btrfs_root *root) | |
2044 | { | |
2045 | LIST_HEAD(inode_list); | |
2046 | struct btrfs_key key; | |
2047 | struct btrfs_key next_key; | |
2048 | struct btrfs_trans_handle *trans; | |
2049 | struct btrfs_root *reloc_root; | |
2050 | struct btrfs_root_item *root_item; | |
2051 | struct btrfs_path *path; | |
3fd0a558 | 2052 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2053 | int level; |
2054 | int max_level; | |
2055 | int replaced = 0; | |
2056 | int ret; | |
2057 | int err = 0; | |
3fd0a558 | 2058 | u32 min_reserved; |
5d4f98a2 YZ |
2059 | |
2060 | path = btrfs_alloc_path(); | |
2061 | if (!path) | |
2062 | return -ENOMEM; | |
026fd317 | 2063 | path->reada = 1; |
5d4f98a2 YZ |
2064 | |
2065 | reloc_root = root->reloc_root; | |
2066 | root_item = &reloc_root->root_item; | |
2067 | ||
2068 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { | |
2069 | level = btrfs_root_level(root_item); | |
2070 | extent_buffer_get(reloc_root->node); | |
2071 | path->nodes[level] = reloc_root->node; | |
2072 | path->slots[level] = 0; | |
2073 | } else { | |
2074 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); | |
2075 | ||
2076 | level = root_item->drop_level; | |
2077 | BUG_ON(level == 0); | |
2078 | path->lowest_level = level; | |
2079 | ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); | |
33c66f43 | 2080 | path->lowest_level = 0; |
5d4f98a2 YZ |
2081 | if (ret < 0) { |
2082 | btrfs_free_path(path); | |
2083 | return ret; | |
2084 | } | |
2085 | ||
2086 | btrfs_node_key_to_cpu(path->nodes[level], &next_key, | |
2087 | path->slots[level]); | |
2088 | WARN_ON(memcmp(&key, &next_key, sizeof(key))); | |
2089 | ||
2090 | btrfs_unlock_up_safe(path, 0); | |
2091 | } | |
2092 | ||
3fd0a558 YZ |
2093 | min_reserved = root->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; |
2094 | memset(&next_key, 0, sizeof(next_key)); | |
5d4f98a2 | 2095 | |
3fd0a558 YZ |
2096 | while (1) { |
2097 | trans = btrfs_start_transaction(root, 0); | |
98d5dc13 | 2098 | BUG_ON(IS_ERR(trans)); |
3fd0a558 | 2099 | trans->block_rsv = rc->block_rsv; |
5d4f98a2 | 2100 | |
08e007d2 MX |
2101 | ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved, |
2102 | BTRFS_RESERVE_FLUSH_ALL); | |
3fd0a558 YZ |
2103 | if (ret) { |
2104 | BUG_ON(ret != -EAGAIN); | |
2105 | ret = btrfs_commit_transaction(trans, root); | |
2106 | BUG_ON(ret); | |
2107 | continue; | |
5d4f98a2 YZ |
2108 | } |
2109 | ||
5d4f98a2 | 2110 | replaced = 0; |
5d4f98a2 YZ |
2111 | max_level = level; |
2112 | ||
2113 | ret = walk_down_reloc_tree(reloc_root, path, &level); | |
2114 | if (ret < 0) { | |
2115 | err = ret; | |
2116 | goto out; | |
2117 | } | |
2118 | if (ret > 0) | |
2119 | break; | |
2120 | ||
2121 | if (!find_next_key(path, level, &key) && | |
2122 | btrfs_comp_cpu_keys(&next_key, &key) >= 0) { | |
2123 | ret = 0; | |
5d4f98a2 | 2124 | } else { |
3fd0a558 YZ |
2125 | ret = replace_path(trans, root, reloc_root, path, |
2126 | &next_key, level, max_level); | |
5d4f98a2 YZ |
2127 | } |
2128 | if (ret < 0) { | |
2129 | err = ret; | |
2130 | goto out; | |
2131 | } | |
2132 | ||
2133 | if (ret > 0) { | |
2134 | level = ret; | |
2135 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
2136 | path->slots[level]); | |
2137 | replaced = 1; | |
5d4f98a2 YZ |
2138 | } |
2139 | ||
2140 | ret = walk_up_reloc_tree(reloc_root, path, &level); | |
2141 | if (ret > 0) | |
2142 | break; | |
2143 | ||
2144 | BUG_ON(level == 0); | |
2145 | /* | |
2146 | * save the merging progress in the drop_progress. | |
2147 | * this is OK since root refs == 1 in this case. | |
2148 | */ | |
2149 | btrfs_node_key(path->nodes[level], &root_item->drop_progress, | |
2150 | path->slots[level]); | |
2151 | root_item->drop_level = level; | |
2152 | ||
3fd0a558 | 2153 | btrfs_end_transaction_throttle(trans, root); |
5d4f98a2 | 2154 | |
b53d3f5d | 2155 | btrfs_btree_balance_dirty(root); |
5d4f98a2 YZ |
2156 | |
2157 | if (replaced && rc->stage == UPDATE_DATA_PTRS) | |
2158 | invalidate_extent_cache(root, &key, &next_key); | |
2159 | } | |
2160 | ||
2161 | /* | |
2162 | * handle the case only one block in the fs tree need to be | |
2163 | * relocated and the block is tree root. | |
2164 | */ | |
2165 | leaf = btrfs_lock_root_node(root); | |
2166 | ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); | |
2167 | btrfs_tree_unlock(leaf); | |
2168 | free_extent_buffer(leaf); | |
2169 | if (ret < 0) | |
2170 | err = ret; | |
2171 | out: | |
2172 | btrfs_free_path(path); | |
2173 | ||
2174 | if (err == 0) { | |
2175 | memset(&root_item->drop_progress, 0, | |
2176 | sizeof(root_item->drop_progress)); | |
2177 | root_item->drop_level = 0; | |
2178 | btrfs_set_root_refs(root_item, 0); | |
3fd0a558 | 2179 | btrfs_update_reloc_root(trans, root); |
5d4f98a2 YZ |
2180 | } |
2181 | ||
3fd0a558 | 2182 | btrfs_end_transaction_throttle(trans, root); |
5d4f98a2 | 2183 | |
b53d3f5d | 2184 | btrfs_btree_balance_dirty(root); |
5d4f98a2 | 2185 | |
5d4f98a2 YZ |
2186 | if (replaced && rc->stage == UPDATE_DATA_PTRS) |
2187 | invalidate_extent_cache(root, &key, &next_key); | |
2188 | ||
2189 | return err; | |
2190 | } | |
2191 | ||
3fd0a558 YZ |
2192 | static noinline_for_stack |
2193 | int prepare_to_merge(struct reloc_control *rc, int err) | |
5d4f98a2 | 2194 | { |
3fd0a558 | 2195 | struct btrfs_root *root = rc->extent_root; |
5d4f98a2 | 2196 | struct btrfs_root *reloc_root; |
3fd0a558 YZ |
2197 | struct btrfs_trans_handle *trans; |
2198 | LIST_HEAD(reloc_roots); | |
2199 | u64 num_bytes = 0; | |
2200 | int ret; | |
3fd0a558 | 2201 | |
7585717f | 2202 | mutex_lock(&root->fs_info->reloc_mutex); |
3fd0a558 YZ |
2203 | rc->merging_rsv_size += root->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; |
2204 | rc->merging_rsv_size += rc->nodes_relocated * 2; | |
7585717f CM |
2205 | mutex_unlock(&root->fs_info->reloc_mutex); |
2206 | ||
3fd0a558 YZ |
2207 | again: |
2208 | if (!err) { | |
2209 | num_bytes = rc->merging_rsv_size; | |
08e007d2 MX |
2210 | ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, |
2211 | BTRFS_RESERVE_FLUSH_ALL); | |
3fd0a558 YZ |
2212 | if (ret) |
2213 | err = ret; | |
2214 | } | |
2215 | ||
7a7eaa40 | 2216 | trans = btrfs_join_transaction(rc->extent_root); |
3612b495 TI |
2217 | if (IS_ERR(trans)) { |
2218 | if (!err) | |
2219 | btrfs_block_rsv_release(rc->extent_root, | |
2220 | rc->block_rsv, num_bytes); | |
2221 | return PTR_ERR(trans); | |
2222 | } | |
3fd0a558 YZ |
2223 | |
2224 | if (!err) { | |
2225 | if (num_bytes != rc->merging_rsv_size) { | |
2226 | btrfs_end_transaction(trans, rc->extent_root); | |
2227 | btrfs_block_rsv_release(rc->extent_root, | |
2228 | rc->block_rsv, num_bytes); | |
3fd0a558 YZ |
2229 | goto again; |
2230 | } | |
2231 | } | |
5d4f98a2 | 2232 | |
3fd0a558 YZ |
2233 | rc->merge_reloc_tree = 1; |
2234 | ||
2235 | while (!list_empty(&rc->reloc_roots)) { | |
2236 | reloc_root = list_entry(rc->reloc_roots.next, | |
2237 | struct btrfs_root, root_list); | |
2238 | list_del_init(&reloc_root->root_list); | |
5d4f98a2 | 2239 | |
5d4f98a2 YZ |
2240 | root = read_fs_root(reloc_root->fs_info, |
2241 | reloc_root->root_key.offset); | |
2242 | BUG_ON(IS_ERR(root)); | |
2243 | BUG_ON(root->reloc_root != reloc_root); | |
2244 | ||
3fd0a558 YZ |
2245 | /* |
2246 | * set reference count to 1, so btrfs_recover_relocation | |
2247 | * knows it should resumes merging | |
2248 | */ | |
2249 | if (!err) | |
2250 | btrfs_set_root_refs(&reloc_root->root_item, 1); | |
5d4f98a2 | 2251 | btrfs_update_reloc_root(trans, root); |
5d4f98a2 | 2252 | |
3fd0a558 YZ |
2253 | list_add(&reloc_root->root_list, &reloc_roots); |
2254 | } | |
5d4f98a2 | 2255 | |
3fd0a558 | 2256 | list_splice(&reloc_roots, &rc->reloc_roots); |
5d4f98a2 | 2257 | |
3fd0a558 YZ |
2258 | if (!err) |
2259 | btrfs_commit_transaction(trans, rc->extent_root); | |
2260 | else | |
2261 | btrfs_end_transaction(trans, rc->extent_root); | |
2262 | return err; | |
5d4f98a2 YZ |
2263 | } |
2264 | ||
aca1bba6 LB |
2265 | static noinline_for_stack |
2266 | void free_reloc_roots(struct list_head *list) | |
2267 | { | |
2268 | struct btrfs_root *reloc_root; | |
2269 | ||
2270 | while (!list_empty(list)) { | |
2271 | reloc_root = list_entry(list->next, struct btrfs_root, | |
2272 | root_list); | |
2273 | __update_reloc_root(reloc_root, 1); | |
2274 | free_extent_buffer(reloc_root->node); | |
2275 | free_extent_buffer(reloc_root->commit_root); | |
2276 | kfree(reloc_root); | |
2277 | } | |
2278 | } | |
2279 | ||
3fd0a558 YZ |
2280 | static noinline_for_stack |
2281 | int merge_reloc_roots(struct reloc_control *rc) | |
5d4f98a2 | 2282 | { |
5bc7247a | 2283 | struct btrfs_trans_handle *trans; |
5d4f98a2 | 2284 | struct btrfs_root *root; |
3fd0a558 | 2285 | struct btrfs_root *reloc_root; |
5bc7247a MX |
2286 | u64 last_snap; |
2287 | u64 otransid; | |
2288 | u64 objectid; | |
3fd0a558 YZ |
2289 | LIST_HEAD(reloc_roots); |
2290 | int found = 0; | |
aca1bba6 | 2291 | int ret = 0; |
3fd0a558 YZ |
2292 | again: |
2293 | root = rc->extent_root; | |
7585717f CM |
2294 | |
2295 | /* | |
2296 | * this serializes us with btrfs_record_root_in_transaction, | |
2297 | * we have to make sure nobody is in the middle of | |
2298 | * adding their roots to the list while we are | |
2299 | * doing this splice | |
2300 | */ | |
2301 | mutex_lock(&root->fs_info->reloc_mutex); | |
3fd0a558 | 2302 | list_splice_init(&rc->reloc_roots, &reloc_roots); |
7585717f | 2303 | mutex_unlock(&root->fs_info->reloc_mutex); |
5d4f98a2 | 2304 | |
3fd0a558 YZ |
2305 | while (!list_empty(&reloc_roots)) { |
2306 | found = 1; | |
2307 | reloc_root = list_entry(reloc_roots.next, | |
2308 | struct btrfs_root, root_list); | |
5d4f98a2 | 2309 | |
3fd0a558 YZ |
2310 | if (btrfs_root_refs(&reloc_root->root_item) > 0) { |
2311 | root = read_fs_root(reloc_root->fs_info, | |
2312 | reloc_root->root_key.offset); | |
2313 | BUG_ON(IS_ERR(root)); | |
2314 | BUG_ON(root->reloc_root != reloc_root); | |
5d4f98a2 | 2315 | |
3fd0a558 | 2316 | ret = merge_reloc_root(rc, root); |
aca1bba6 LB |
2317 | if (ret) |
2318 | goto out; | |
3fd0a558 YZ |
2319 | } else { |
2320 | list_del_init(&reloc_root->root_list); | |
2321 | } | |
5bc7247a MX |
2322 | |
2323 | /* | |
2324 | * we keep the old last snapshod transid in rtranid when we | |
2325 | * created the relocation tree. | |
2326 | */ | |
2327 | last_snap = btrfs_root_rtransid(&reloc_root->root_item); | |
2328 | otransid = btrfs_root_otransid(&reloc_root->root_item); | |
2329 | objectid = reloc_root->root_key.offset; | |
2330 | ||
2c536799 | 2331 | ret = btrfs_drop_snapshot(reloc_root, rc->block_rsv, 0, 1); |
aca1bba6 LB |
2332 | if (ret < 0) { |
2333 | if (list_empty(&reloc_root->root_list)) | |
2334 | list_add_tail(&reloc_root->root_list, | |
2335 | &reloc_roots); | |
2336 | goto out; | |
5bc7247a MX |
2337 | } else if (!ret) { |
2338 | /* | |
2339 | * recover the last snapshot tranid to avoid | |
2340 | * the space balance break NOCOW. | |
2341 | */ | |
2342 | root = read_fs_root(rc->extent_root->fs_info, | |
2343 | objectid); | |
2344 | if (IS_ERR(root)) | |
2345 | continue; | |
2346 | ||
2347 | if (btrfs_root_refs(&root->root_item) == 0) | |
2348 | continue; | |
2349 | ||
2350 | trans = btrfs_join_transaction(root); | |
2351 | BUG_ON(IS_ERR(trans)); | |
2352 | ||
2353 | /* Check if the fs/file tree was snapshoted or not. */ | |
2354 | if (btrfs_root_last_snapshot(&root->root_item) == | |
2355 | otransid - 1) | |
2356 | btrfs_set_root_last_snapshot(&root->root_item, | |
2357 | last_snap); | |
2358 | ||
2359 | btrfs_end_transaction(trans, root); | |
aca1bba6 | 2360 | } |
5d4f98a2 YZ |
2361 | } |
2362 | ||
3fd0a558 YZ |
2363 | if (found) { |
2364 | found = 0; | |
2365 | goto again; | |
2366 | } | |
aca1bba6 LB |
2367 | out: |
2368 | if (ret) { | |
2369 | btrfs_std_error(root->fs_info, ret); | |
2370 | if (!list_empty(&reloc_roots)) | |
2371 | free_reloc_roots(&reloc_roots); | |
2372 | } | |
2373 | ||
5d4f98a2 | 2374 | BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); |
aca1bba6 | 2375 | return ret; |
5d4f98a2 YZ |
2376 | } |
2377 | ||
2378 | static void free_block_list(struct rb_root *blocks) | |
2379 | { | |
2380 | struct tree_block *block; | |
2381 | struct rb_node *rb_node; | |
2382 | while ((rb_node = rb_first(blocks))) { | |
2383 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
2384 | rb_erase(rb_node, blocks); | |
2385 | kfree(block); | |
2386 | } | |
2387 | } | |
2388 | ||
2389 | static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, | |
2390 | struct btrfs_root *reloc_root) | |
2391 | { | |
2392 | struct btrfs_root *root; | |
2393 | ||
2394 | if (reloc_root->last_trans == trans->transid) | |
2395 | return 0; | |
2396 | ||
2397 | root = read_fs_root(reloc_root->fs_info, reloc_root->root_key.offset); | |
2398 | BUG_ON(IS_ERR(root)); | |
2399 | BUG_ON(root->reloc_root != reloc_root); | |
2400 | ||
2401 | return btrfs_record_root_in_trans(trans, root); | |
2402 | } | |
2403 | ||
3fd0a558 YZ |
2404 | static noinline_for_stack |
2405 | struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, | |
2406 | struct reloc_control *rc, | |
2407 | struct backref_node *node, | |
2408 | struct backref_edge *edges[], int *nr) | |
5d4f98a2 YZ |
2409 | { |
2410 | struct backref_node *next; | |
2411 | struct btrfs_root *root; | |
3fd0a558 YZ |
2412 | int index = 0; |
2413 | ||
5d4f98a2 YZ |
2414 | next = node; |
2415 | while (1) { | |
2416 | cond_resched(); | |
2417 | next = walk_up_backref(next, edges, &index); | |
2418 | root = next->root; | |
3fd0a558 YZ |
2419 | BUG_ON(!root); |
2420 | BUG_ON(!root->ref_cows); | |
5d4f98a2 YZ |
2421 | |
2422 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
2423 | record_reloc_root_in_trans(trans, root); | |
2424 | break; | |
2425 | } | |
2426 | ||
3fd0a558 YZ |
2427 | btrfs_record_root_in_trans(trans, root); |
2428 | root = root->reloc_root; | |
2429 | ||
2430 | if (next->new_bytenr != root->node->start) { | |
2431 | BUG_ON(next->new_bytenr); | |
2432 | BUG_ON(!list_empty(&next->list)); | |
2433 | next->new_bytenr = root->node->start; | |
2434 | next->root = root; | |
2435 | list_add_tail(&next->list, | |
2436 | &rc->backref_cache.changed); | |
2437 | __mark_block_processed(rc, next); | |
5d4f98a2 YZ |
2438 | break; |
2439 | } | |
2440 | ||
3fd0a558 | 2441 | WARN_ON(1); |
5d4f98a2 YZ |
2442 | root = NULL; |
2443 | next = walk_down_backref(edges, &index); | |
2444 | if (!next || next->level <= node->level) | |
2445 | break; | |
2446 | } | |
3fd0a558 YZ |
2447 | if (!root) |
2448 | return NULL; | |
5d4f98a2 | 2449 | |
3fd0a558 YZ |
2450 | *nr = index; |
2451 | next = node; | |
2452 | /* setup backref node path for btrfs_reloc_cow_block */ | |
2453 | while (1) { | |
2454 | rc->backref_cache.path[next->level] = next; | |
2455 | if (--index < 0) | |
2456 | break; | |
2457 | next = edges[index]->node[UPPER]; | |
5d4f98a2 | 2458 | } |
5d4f98a2 YZ |
2459 | return root; |
2460 | } | |
2461 | ||
3fd0a558 YZ |
2462 | /* |
2463 | * select a tree root for relocation. return NULL if the block | |
2464 | * is reference counted. we should use do_relocation() in this | |
2465 | * case. return a tree root pointer if the block isn't reference | |
2466 | * counted. return -ENOENT if the block is root of reloc tree. | |
2467 | */ | |
5d4f98a2 YZ |
2468 | static noinline_for_stack |
2469 | struct btrfs_root *select_one_root(struct btrfs_trans_handle *trans, | |
2470 | struct backref_node *node) | |
2471 | { | |
3fd0a558 YZ |
2472 | struct backref_node *next; |
2473 | struct btrfs_root *root; | |
2474 | struct btrfs_root *fs_root = NULL; | |
5d4f98a2 | 2475 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; |
3fd0a558 YZ |
2476 | int index = 0; |
2477 | ||
2478 | next = node; | |
2479 | while (1) { | |
2480 | cond_resched(); | |
2481 | next = walk_up_backref(next, edges, &index); | |
2482 | root = next->root; | |
2483 | BUG_ON(!root); | |
2484 | ||
25985edc | 2485 | /* no other choice for non-references counted tree */ |
3fd0a558 YZ |
2486 | if (!root->ref_cows) |
2487 | return root; | |
2488 | ||
2489 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) | |
2490 | fs_root = root; | |
2491 | ||
2492 | if (next != node) | |
2493 | return NULL; | |
2494 | ||
2495 | next = walk_down_backref(edges, &index); | |
2496 | if (!next || next->level <= node->level) | |
2497 | break; | |
2498 | } | |
2499 | ||
2500 | if (!fs_root) | |
2501 | return ERR_PTR(-ENOENT); | |
2502 | return fs_root; | |
5d4f98a2 YZ |
2503 | } |
2504 | ||
2505 | static noinline_for_stack | |
3fd0a558 YZ |
2506 | u64 calcu_metadata_size(struct reloc_control *rc, |
2507 | struct backref_node *node, int reserve) | |
5d4f98a2 | 2508 | { |
3fd0a558 YZ |
2509 | struct backref_node *next = node; |
2510 | struct backref_edge *edge; | |
2511 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; | |
2512 | u64 num_bytes = 0; | |
2513 | int index = 0; | |
2514 | ||
2515 | BUG_ON(reserve && node->processed); | |
2516 | ||
2517 | while (next) { | |
2518 | cond_resched(); | |
2519 | while (1) { | |
2520 | if (next->processed && (reserve || next != node)) | |
2521 | break; | |
2522 | ||
2523 | num_bytes += btrfs_level_size(rc->extent_root, | |
2524 | next->level); | |
2525 | ||
2526 | if (list_empty(&next->upper)) | |
2527 | break; | |
2528 | ||
2529 | edge = list_entry(next->upper.next, | |
2530 | struct backref_edge, list[LOWER]); | |
2531 | edges[index++] = edge; | |
2532 | next = edge->node[UPPER]; | |
2533 | } | |
2534 | next = walk_down_backref(edges, &index); | |
2535 | } | |
2536 | return num_bytes; | |
5d4f98a2 YZ |
2537 | } |
2538 | ||
3fd0a558 YZ |
2539 | static int reserve_metadata_space(struct btrfs_trans_handle *trans, |
2540 | struct reloc_control *rc, | |
2541 | struct backref_node *node) | |
5d4f98a2 | 2542 | { |
3fd0a558 YZ |
2543 | struct btrfs_root *root = rc->extent_root; |
2544 | u64 num_bytes; | |
2545 | int ret; | |
2546 | ||
2547 | num_bytes = calcu_metadata_size(rc, node, 1) * 2; | |
5d4f98a2 | 2548 | |
3fd0a558 | 2549 | trans->block_rsv = rc->block_rsv; |
08e007d2 MX |
2550 | ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, |
2551 | BTRFS_RESERVE_FLUSH_ALL); | |
3fd0a558 YZ |
2552 | if (ret) { |
2553 | if (ret == -EAGAIN) | |
2554 | rc->commit_transaction = 1; | |
2555 | return ret; | |
5d4f98a2 | 2556 | } |
3fd0a558 | 2557 | |
3fd0a558 YZ |
2558 | return 0; |
2559 | } | |
2560 | ||
2561 | static void release_metadata_space(struct reloc_control *rc, | |
2562 | struct backref_node *node) | |
2563 | { | |
2564 | u64 num_bytes = calcu_metadata_size(rc, node, 0) * 2; | |
2565 | btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, num_bytes); | |
5d4f98a2 YZ |
2566 | } |
2567 | ||
2568 | /* | |
2569 | * relocate a block tree, and then update pointers in upper level | |
2570 | * blocks that reference the block to point to the new location. | |
2571 | * | |
2572 | * if called by link_to_upper, the block has already been relocated. | |
2573 | * in that case this function just updates pointers. | |
2574 | */ | |
2575 | static int do_relocation(struct btrfs_trans_handle *trans, | |
3fd0a558 | 2576 | struct reloc_control *rc, |
5d4f98a2 YZ |
2577 | struct backref_node *node, |
2578 | struct btrfs_key *key, | |
2579 | struct btrfs_path *path, int lowest) | |
2580 | { | |
2581 | struct backref_node *upper; | |
2582 | struct backref_edge *edge; | |
2583 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; | |
2584 | struct btrfs_root *root; | |
2585 | struct extent_buffer *eb; | |
2586 | u32 blocksize; | |
2587 | u64 bytenr; | |
2588 | u64 generation; | |
2589 | int nr; | |
2590 | int slot; | |
2591 | int ret; | |
2592 | int err = 0; | |
2593 | ||
2594 | BUG_ON(lowest && node->eb); | |
2595 | ||
2596 | path->lowest_level = node->level + 1; | |
3fd0a558 | 2597 | rc->backref_cache.path[node->level] = node; |
5d4f98a2 YZ |
2598 | list_for_each_entry(edge, &node->upper, list[LOWER]) { |
2599 | cond_resched(); | |
5d4f98a2 YZ |
2600 | |
2601 | upper = edge->node[UPPER]; | |
3fd0a558 YZ |
2602 | root = select_reloc_root(trans, rc, upper, edges, &nr); |
2603 | BUG_ON(!root); | |
2604 | ||
2605 | if (upper->eb && !upper->locked) { | |
2606 | if (!lowest) { | |
2607 | ret = btrfs_bin_search(upper->eb, key, | |
2608 | upper->level, &slot); | |
2609 | BUG_ON(ret); | |
2610 | bytenr = btrfs_node_blockptr(upper->eb, slot); | |
2611 | if (node->eb->start == bytenr) | |
2612 | goto next; | |
2613 | } | |
5d4f98a2 | 2614 | drop_node_buffer(upper); |
3fd0a558 | 2615 | } |
5d4f98a2 YZ |
2616 | |
2617 | if (!upper->eb) { | |
2618 | ret = btrfs_search_slot(trans, root, key, path, 0, 1); | |
2619 | if (ret < 0) { | |
2620 | err = ret; | |
2621 | break; | |
2622 | } | |
2623 | BUG_ON(ret > 0); | |
2624 | ||
3fd0a558 YZ |
2625 | if (!upper->eb) { |
2626 | upper->eb = path->nodes[upper->level]; | |
2627 | path->nodes[upper->level] = NULL; | |
2628 | } else { | |
2629 | BUG_ON(upper->eb != path->nodes[upper->level]); | |
2630 | } | |
5d4f98a2 | 2631 | |
3fd0a558 YZ |
2632 | upper->locked = 1; |
2633 | path->locks[upper->level] = 0; | |
5d4f98a2 | 2634 | |
3fd0a558 | 2635 | slot = path->slots[upper->level]; |
b3b4aa74 | 2636 | btrfs_release_path(path); |
5d4f98a2 YZ |
2637 | } else { |
2638 | ret = btrfs_bin_search(upper->eb, key, upper->level, | |
2639 | &slot); | |
2640 | BUG_ON(ret); | |
2641 | } | |
2642 | ||
2643 | bytenr = btrfs_node_blockptr(upper->eb, slot); | |
3fd0a558 YZ |
2644 | if (lowest) { |
2645 | BUG_ON(bytenr != node->bytenr); | |
5d4f98a2 | 2646 | } else { |
3fd0a558 YZ |
2647 | if (node->eb->start == bytenr) |
2648 | goto next; | |
5d4f98a2 YZ |
2649 | } |
2650 | ||
2651 | blocksize = btrfs_level_size(root, node->level); | |
2652 | generation = btrfs_node_ptr_generation(upper->eb, slot); | |
2653 | eb = read_tree_block(root, bytenr, blocksize, generation); | |
416bc658 JB |
2654 | if (!eb || !extent_buffer_uptodate(eb)) { |
2655 | free_extent_buffer(eb); | |
97d9a8a4 TI |
2656 | err = -EIO; |
2657 | goto next; | |
2658 | } | |
5d4f98a2 YZ |
2659 | btrfs_tree_lock(eb); |
2660 | btrfs_set_lock_blocking(eb); | |
2661 | ||
2662 | if (!node->eb) { | |
2663 | ret = btrfs_cow_block(trans, root, eb, upper->eb, | |
2664 | slot, &eb); | |
3fd0a558 YZ |
2665 | btrfs_tree_unlock(eb); |
2666 | free_extent_buffer(eb); | |
5d4f98a2 YZ |
2667 | if (ret < 0) { |
2668 | err = ret; | |
3fd0a558 | 2669 | goto next; |
5d4f98a2 | 2670 | } |
3fd0a558 | 2671 | BUG_ON(node->eb != eb); |
5d4f98a2 YZ |
2672 | } else { |
2673 | btrfs_set_node_blockptr(upper->eb, slot, | |
2674 | node->eb->start); | |
2675 | btrfs_set_node_ptr_generation(upper->eb, slot, | |
2676 | trans->transid); | |
2677 | btrfs_mark_buffer_dirty(upper->eb); | |
2678 | ||
2679 | ret = btrfs_inc_extent_ref(trans, root, | |
2680 | node->eb->start, blocksize, | |
2681 | upper->eb->start, | |
2682 | btrfs_header_owner(upper->eb), | |
66d7e7f0 | 2683 | node->level, 0, 1); |
5d4f98a2 YZ |
2684 | BUG_ON(ret); |
2685 | ||
2686 | ret = btrfs_drop_subtree(trans, root, eb, upper->eb); | |
2687 | BUG_ON(ret); | |
5d4f98a2 | 2688 | } |
3fd0a558 YZ |
2689 | next: |
2690 | if (!upper->pending) | |
2691 | drop_node_buffer(upper); | |
2692 | else | |
2693 | unlock_node_buffer(upper); | |
2694 | if (err) | |
2695 | break; | |
5d4f98a2 | 2696 | } |
3fd0a558 YZ |
2697 | |
2698 | if (!err && node->pending) { | |
2699 | drop_node_buffer(node); | |
2700 | list_move_tail(&node->list, &rc->backref_cache.changed); | |
2701 | node->pending = 0; | |
2702 | } | |
2703 | ||
5d4f98a2 | 2704 | path->lowest_level = 0; |
3fd0a558 | 2705 | BUG_ON(err == -ENOSPC); |
5d4f98a2 YZ |
2706 | return err; |
2707 | } | |
2708 | ||
2709 | static int link_to_upper(struct btrfs_trans_handle *trans, | |
3fd0a558 | 2710 | struct reloc_control *rc, |
5d4f98a2 YZ |
2711 | struct backref_node *node, |
2712 | struct btrfs_path *path) | |
2713 | { | |
2714 | struct btrfs_key key; | |
5d4f98a2 YZ |
2715 | |
2716 | btrfs_node_key_to_cpu(node->eb, &key, 0); | |
3fd0a558 | 2717 | return do_relocation(trans, rc, node, &key, path, 0); |
5d4f98a2 YZ |
2718 | } |
2719 | ||
2720 | static int finish_pending_nodes(struct btrfs_trans_handle *trans, | |
3fd0a558 YZ |
2721 | struct reloc_control *rc, |
2722 | struct btrfs_path *path, int err) | |
5d4f98a2 | 2723 | { |
3fd0a558 YZ |
2724 | LIST_HEAD(list); |
2725 | struct backref_cache *cache = &rc->backref_cache; | |
5d4f98a2 YZ |
2726 | struct backref_node *node; |
2727 | int level; | |
2728 | int ret; | |
5d4f98a2 YZ |
2729 | |
2730 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { | |
2731 | while (!list_empty(&cache->pending[level])) { | |
2732 | node = list_entry(cache->pending[level].next, | |
3fd0a558 YZ |
2733 | struct backref_node, list); |
2734 | list_move_tail(&node->list, &list); | |
2735 | BUG_ON(!node->pending); | |
5d4f98a2 | 2736 | |
3fd0a558 YZ |
2737 | if (!err) { |
2738 | ret = link_to_upper(trans, rc, node, path); | |
2739 | if (ret < 0) | |
2740 | err = ret; | |
2741 | } | |
5d4f98a2 | 2742 | } |
3fd0a558 | 2743 | list_splice_init(&list, &cache->pending[level]); |
5d4f98a2 | 2744 | } |
5d4f98a2 YZ |
2745 | return err; |
2746 | } | |
2747 | ||
2748 | static void mark_block_processed(struct reloc_control *rc, | |
3fd0a558 YZ |
2749 | u64 bytenr, u32 blocksize) |
2750 | { | |
2751 | set_extent_bits(&rc->processed_blocks, bytenr, bytenr + blocksize - 1, | |
2752 | EXTENT_DIRTY, GFP_NOFS); | |
2753 | } | |
2754 | ||
2755 | static void __mark_block_processed(struct reloc_control *rc, | |
2756 | struct backref_node *node) | |
5d4f98a2 YZ |
2757 | { |
2758 | u32 blocksize; | |
2759 | if (node->level == 0 || | |
2760 | in_block_group(node->bytenr, rc->block_group)) { | |
2761 | blocksize = btrfs_level_size(rc->extent_root, node->level); | |
3fd0a558 | 2762 | mark_block_processed(rc, node->bytenr, blocksize); |
5d4f98a2 YZ |
2763 | } |
2764 | node->processed = 1; | |
2765 | } | |
2766 | ||
2767 | /* | |
2768 | * mark a block and all blocks directly/indirectly reference the block | |
2769 | * as processed. | |
2770 | */ | |
2771 | static void update_processed_blocks(struct reloc_control *rc, | |
2772 | struct backref_node *node) | |
2773 | { | |
2774 | struct backref_node *next = node; | |
2775 | struct backref_edge *edge; | |
2776 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; | |
2777 | int index = 0; | |
2778 | ||
2779 | while (next) { | |
2780 | cond_resched(); | |
2781 | while (1) { | |
2782 | if (next->processed) | |
2783 | break; | |
2784 | ||
3fd0a558 | 2785 | __mark_block_processed(rc, next); |
5d4f98a2 YZ |
2786 | |
2787 | if (list_empty(&next->upper)) | |
2788 | break; | |
2789 | ||
2790 | edge = list_entry(next->upper.next, | |
2791 | struct backref_edge, list[LOWER]); | |
2792 | edges[index++] = edge; | |
2793 | next = edge->node[UPPER]; | |
2794 | } | |
2795 | next = walk_down_backref(edges, &index); | |
2796 | } | |
2797 | } | |
2798 | ||
3fd0a558 YZ |
2799 | static int tree_block_processed(u64 bytenr, u32 blocksize, |
2800 | struct reloc_control *rc) | |
2801 | { | |
2802 | if (test_range_bit(&rc->processed_blocks, bytenr, | |
2803 | bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL)) | |
2804 | return 1; | |
2805 | return 0; | |
5d4f98a2 YZ |
2806 | } |
2807 | ||
2808 | static int get_tree_block_key(struct reloc_control *rc, | |
2809 | struct tree_block *block) | |
2810 | { | |
2811 | struct extent_buffer *eb; | |
2812 | ||
2813 | BUG_ON(block->key_ready); | |
2814 | eb = read_tree_block(rc->extent_root, block->bytenr, | |
2815 | block->key.objectid, block->key.offset); | |
416bc658 JB |
2816 | if (!eb || !extent_buffer_uptodate(eb)) { |
2817 | free_extent_buffer(eb); | |
2818 | return -EIO; | |
2819 | } | |
5d4f98a2 YZ |
2820 | WARN_ON(btrfs_header_level(eb) != block->level); |
2821 | if (block->level == 0) | |
2822 | btrfs_item_key_to_cpu(eb, &block->key, 0); | |
2823 | else | |
2824 | btrfs_node_key_to_cpu(eb, &block->key, 0); | |
2825 | free_extent_buffer(eb); | |
2826 | block->key_ready = 1; | |
2827 | return 0; | |
2828 | } | |
2829 | ||
2830 | static int reada_tree_block(struct reloc_control *rc, | |
2831 | struct tree_block *block) | |
2832 | { | |
2833 | BUG_ON(block->key_ready); | |
3173a18f JB |
2834 | if (block->key.type == BTRFS_METADATA_ITEM_KEY) |
2835 | readahead_tree_block(rc->extent_root, block->bytenr, | |
2836 | block->key.objectid, | |
2837 | rc->extent_root->leafsize); | |
2838 | else | |
2839 | readahead_tree_block(rc->extent_root, block->bytenr, | |
2840 | block->key.objectid, block->key.offset); | |
5d4f98a2 YZ |
2841 | return 0; |
2842 | } | |
2843 | ||
2844 | /* | |
2845 | * helper function to relocate a tree block | |
2846 | */ | |
2847 | static int relocate_tree_block(struct btrfs_trans_handle *trans, | |
2848 | struct reloc_control *rc, | |
2849 | struct backref_node *node, | |
2850 | struct btrfs_key *key, | |
2851 | struct btrfs_path *path) | |
2852 | { | |
2853 | struct btrfs_root *root; | |
3fd0a558 YZ |
2854 | int release = 0; |
2855 | int ret = 0; | |
2856 | ||
2857 | if (!node) | |
2858 | return 0; | |
5d4f98a2 | 2859 | |
3fd0a558 | 2860 | BUG_ON(node->processed); |
5d4f98a2 | 2861 | root = select_one_root(trans, node); |
3fd0a558 | 2862 | if (root == ERR_PTR(-ENOENT)) { |
5d4f98a2 | 2863 | update_processed_blocks(rc, node); |
3fd0a558 | 2864 | goto out; |
5d4f98a2 YZ |
2865 | } |
2866 | ||
3fd0a558 YZ |
2867 | if (!root || root->ref_cows) { |
2868 | ret = reserve_metadata_space(trans, rc, node); | |
2869 | if (ret) | |
5d4f98a2 | 2870 | goto out; |
3fd0a558 | 2871 | release = 1; |
5d4f98a2 YZ |
2872 | } |
2873 | ||
3fd0a558 YZ |
2874 | if (root) { |
2875 | if (root->ref_cows) { | |
2876 | BUG_ON(node->new_bytenr); | |
2877 | BUG_ON(!list_empty(&node->list)); | |
2878 | btrfs_record_root_in_trans(trans, root); | |
2879 | root = root->reloc_root; | |
2880 | node->new_bytenr = root->node->start; | |
2881 | node->root = root; | |
2882 | list_add_tail(&node->list, &rc->backref_cache.changed); | |
2883 | } else { | |
2884 | path->lowest_level = node->level; | |
2885 | ret = btrfs_search_slot(trans, root, key, path, 0, 1); | |
b3b4aa74 | 2886 | btrfs_release_path(path); |
3fd0a558 YZ |
2887 | if (ret > 0) |
2888 | ret = 0; | |
2889 | } | |
2890 | if (!ret) | |
2891 | update_processed_blocks(rc, node); | |
2892 | } else { | |
2893 | ret = do_relocation(trans, rc, node, key, path, 1); | |
2894 | } | |
5d4f98a2 | 2895 | out: |
3fd0a558 YZ |
2896 | if (ret || node->level == 0 || node->cowonly) { |
2897 | if (release) | |
2898 | release_metadata_space(rc, node); | |
2899 | remove_backref_node(&rc->backref_cache, node); | |
2900 | } | |
5d4f98a2 YZ |
2901 | return ret; |
2902 | } | |
2903 | ||
2904 | /* | |
2905 | * relocate a list of blocks | |
2906 | */ | |
2907 | static noinline_for_stack | |
2908 | int relocate_tree_blocks(struct btrfs_trans_handle *trans, | |
2909 | struct reloc_control *rc, struct rb_root *blocks) | |
2910 | { | |
5d4f98a2 YZ |
2911 | struct backref_node *node; |
2912 | struct btrfs_path *path; | |
2913 | struct tree_block *block; | |
2914 | struct rb_node *rb_node; | |
5d4f98a2 YZ |
2915 | int ret; |
2916 | int err = 0; | |
2917 | ||
2918 | path = btrfs_alloc_path(); | |
e1a12670 LB |
2919 | if (!path) { |
2920 | err = -ENOMEM; | |
34c2b290 | 2921 | goto out_free_blocks; |
e1a12670 | 2922 | } |
5d4f98a2 | 2923 | |
5d4f98a2 YZ |
2924 | rb_node = rb_first(blocks); |
2925 | while (rb_node) { | |
2926 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
5d4f98a2 YZ |
2927 | if (!block->key_ready) |
2928 | reada_tree_block(rc, block); | |
2929 | rb_node = rb_next(rb_node); | |
2930 | } | |
2931 | ||
2932 | rb_node = rb_first(blocks); | |
2933 | while (rb_node) { | |
2934 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
34c2b290 DS |
2935 | if (!block->key_ready) { |
2936 | err = get_tree_block_key(rc, block); | |
2937 | if (err) | |
2938 | goto out_free_path; | |
2939 | } | |
5d4f98a2 YZ |
2940 | rb_node = rb_next(rb_node); |
2941 | } | |
2942 | ||
2943 | rb_node = rb_first(blocks); | |
2944 | while (rb_node) { | |
2945 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
2946 | ||
3fd0a558 | 2947 | node = build_backref_tree(rc, &block->key, |
5d4f98a2 YZ |
2948 | block->level, block->bytenr); |
2949 | if (IS_ERR(node)) { | |
2950 | err = PTR_ERR(node); | |
2951 | goto out; | |
2952 | } | |
2953 | ||
2954 | ret = relocate_tree_block(trans, rc, node, &block->key, | |
2955 | path); | |
2956 | if (ret < 0) { | |
3fd0a558 YZ |
2957 | if (ret != -EAGAIN || rb_node == rb_first(blocks)) |
2958 | err = ret; | |
5d4f98a2 YZ |
2959 | goto out; |
2960 | } | |
5d4f98a2 YZ |
2961 | rb_node = rb_next(rb_node); |
2962 | } | |
5d4f98a2 | 2963 | out: |
3fd0a558 | 2964 | err = finish_pending_nodes(trans, rc, path, err); |
5d4f98a2 | 2965 | |
34c2b290 | 2966 | out_free_path: |
5d4f98a2 | 2967 | btrfs_free_path(path); |
34c2b290 | 2968 | out_free_blocks: |
e1a12670 | 2969 | free_block_list(blocks); |
5d4f98a2 YZ |
2970 | return err; |
2971 | } | |
2972 | ||
efa56464 YZ |
2973 | static noinline_for_stack |
2974 | int prealloc_file_extent_cluster(struct inode *inode, | |
2975 | struct file_extent_cluster *cluster) | |
2976 | { | |
2977 | u64 alloc_hint = 0; | |
2978 | u64 start; | |
2979 | u64 end; | |
2980 | u64 offset = BTRFS_I(inode)->index_cnt; | |
2981 | u64 num_bytes; | |
2982 | int nr = 0; | |
2983 | int ret = 0; | |
2984 | ||
2985 | BUG_ON(cluster->start != cluster->boundary[0]); | |
2986 | mutex_lock(&inode->i_mutex); | |
2987 | ||
2988 | ret = btrfs_check_data_free_space(inode, cluster->end + | |
2989 | 1 - cluster->start); | |
2990 | if (ret) | |
2991 | goto out; | |
2992 | ||
2993 | while (nr < cluster->nr) { | |
2994 | start = cluster->boundary[nr] - offset; | |
2995 | if (nr + 1 < cluster->nr) | |
2996 | end = cluster->boundary[nr + 1] - 1 - offset; | |
2997 | else | |
2998 | end = cluster->end - offset; | |
2999 | ||
d0082371 | 3000 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
efa56464 YZ |
3001 | num_bytes = end + 1 - start; |
3002 | ret = btrfs_prealloc_file_range(inode, 0, start, | |
3003 | num_bytes, num_bytes, | |
3004 | end + 1, &alloc_hint); | |
d0082371 | 3005 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
efa56464 YZ |
3006 | if (ret) |
3007 | break; | |
3008 | nr++; | |
3009 | } | |
3010 | btrfs_free_reserved_data_space(inode, cluster->end + | |
3011 | 1 - cluster->start); | |
3012 | out: | |
3013 | mutex_unlock(&inode->i_mutex); | |
3014 | return ret; | |
3015 | } | |
3016 | ||
5d4f98a2 | 3017 | static noinline_for_stack |
0257bb82 YZ |
3018 | int setup_extent_mapping(struct inode *inode, u64 start, u64 end, |
3019 | u64 block_start) | |
3020 | { | |
3021 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3022 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
3023 | struct extent_map *em; | |
3024 | int ret = 0; | |
3025 | ||
172ddd60 | 3026 | em = alloc_extent_map(); |
0257bb82 YZ |
3027 | if (!em) |
3028 | return -ENOMEM; | |
3029 | ||
3030 | em->start = start; | |
3031 | em->len = end + 1 - start; | |
3032 | em->block_len = em->len; | |
3033 | em->block_start = block_start; | |
3034 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
3035 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
3036 | ||
d0082371 | 3037 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
0257bb82 YZ |
3038 | while (1) { |
3039 | write_lock(&em_tree->lock); | |
09a2a8f9 | 3040 | ret = add_extent_mapping(em_tree, em, 0); |
0257bb82 YZ |
3041 | write_unlock(&em_tree->lock); |
3042 | if (ret != -EEXIST) { | |
3043 | free_extent_map(em); | |
3044 | break; | |
3045 | } | |
3046 | btrfs_drop_extent_cache(inode, start, end, 0); | |
3047 | } | |
d0082371 | 3048 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
0257bb82 YZ |
3049 | return ret; |
3050 | } | |
3051 | ||
3052 | static int relocate_file_extent_cluster(struct inode *inode, | |
3053 | struct file_extent_cluster *cluster) | |
5d4f98a2 YZ |
3054 | { |
3055 | u64 page_start; | |
3056 | u64 page_end; | |
0257bb82 YZ |
3057 | u64 offset = BTRFS_I(inode)->index_cnt; |
3058 | unsigned long index; | |
5d4f98a2 | 3059 | unsigned long last_index; |
5d4f98a2 YZ |
3060 | struct page *page; |
3061 | struct file_ra_state *ra; | |
3b16a4e3 | 3062 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
0257bb82 | 3063 | int nr = 0; |
5d4f98a2 YZ |
3064 | int ret = 0; |
3065 | ||
0257bb82 YZ |
3066 | if (!cluster->nr) |
3067 | return 0; | |
3068 | ||
5d4f98a2 YZ |
3069 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
3070 | if (!ra) | |
3071 | return -ENOMEM; | |
3072 | ||
efa56464 YZ |
3073 | ret = prealloc_file_extent_cluster(inode, cluster); |
3074 | if (ret) | |
3075 | goto out; | |
0257bb82 | 3076 | |
efa56464 | 3077 | file_ra_state_init(ra, inode->i_mapping); |
5d4f98a2 | 3078 | |
0257bb82 YZ |
3079 | ret = setup_extent_mapping(inode, cluster->start - offset, |
3080 | cluster->end - offset, cluster->start); | |
5d4f98a2 | 3081 | if (ret) |
efa56464 | 3082 | goto out; |
5d4f98a2 | 3083 | |
efa56464 YZ |
3084 | index = (cluster->start - offset) >> PAGE_CACHE_SHIFT; |
3085 | last_index = (cluster->end - offset) >> PAGE_CACHE_SHIFT; | |
0257bb82 | 3086 | while (index <= last_index) { |
efa56464 YZ |
3087 | ret = btrfs_delalloc_reserve_metadata(inode, PAGE_CACHE_SIZE); |
3088 | if (ret) | |
3089 | goto out; | |
3090 | ||
0257bb82 | 3091 | page = find_lock_page(inode->i_mapping, index); |
5d4f98a2 | 3092 | if (!page) { |
0257bb82 YZ |
3093 | page_cache_sync_readahead(inode->i_mapping, |
3094 | ra, NULL, index, | |
3095 | last_index + 1 - index); | |
a94733d0 | 3096 | page = find_or_create_page(inode->i_mapping, index, |
3b16a4e3 | 3097 | mask); |
0257bb82 | 3098 | if (!page) { |
efa56464 YZ |
3099 | btrfs_delalloc_release_metadata(inode, |
3100 | PAGE_CACHE_SIZE); | |
0257bb82 | 3101 | ret = -ENOMEM; |
efa56464 | 3102 | goto out; |
0257bb82 | 3103 | } |
5d4f98a2 | 3104 | } |
0257bb82 YZ |
3105 | |
3106 | if (PageReadahead(page)) { | |
3107 | page_cache_async_readahead(inode->i_mapping, | |
3108 | ra, NULL, page, index, | |
3109 | last_index + 1 - index); | |
3110 | } | |
3111 | ||
5d4f98a2 YZ |
3112 | if (!PageUptodate(page)) { |
3113 | btrfs_readpage(NULL, page); | |
3114 | lock_page(page); | |
3115 | if (!PageUptodate(page)) { | |
3116 | unlock_page(page); | |
3117 | page_cache_release(page); | |
efa56464 YZ |
3118 | btrfs_delalloc_release_metadata(inode, |
3119 | PAGE_CACHE_SIZE); | |
5d4f98a2 | 3120 | ret = -EIO; |
efa56464 | 3121 | goto out; |
5d4f98a2 YZ |
3122 | } |
3123 | } | |
5d4f98a2 | 3124 | |
4eee4fa4 | 3125 | page_start = page_offset(page); |
5d4f98a2 | 3126 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
0257bb82 | 3127 | |
d0082371 | 3128 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); |
0257bb82 | 3129 | |
5d4f98a2 YZ |
3130 | set_page_extent_mapped(page); |
3131 | ||
0257bb82 YZ |
3132 | if (nr < cluster->nr && |
3133 | page_start + offset == cluster->boundary[nr]) { | |
3134 | set_extent_bits(&BTRFS_I(inode)->io_tree, | |
3135 | page_start, page_end, | |
5d4f98a2 | 3136 | EXTENT_BOUNDARY, GFP_NOFS); |
0257bb82 YZ |
3137 | nr++; |
3138 | } | |
5d4f98a2 | 3139 | |
efa56464 | 3140 | btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); |
5d4f98a2 | 3141 | set_page_dirty(page); |
5d4f98a2 | 3142 | |
0257bb82 | 3143 | unlock_extent(&BTRFS_I(inode)->io_tree, |
d0082371 | 3144 | page_start, page_end); |
5d4f98a2 YZ |
3145 | unlock_page(page); |
3146 | page_cache_release(page); | |
0257bb82 YZ |
3147 | |
3148 | index++; | |
efa56464 YZ |
3149 | balance_dirty_pages_ratelimited(inode->i_mapping); |
3150 | btrfs_throttle(BTRFS_I(inode)->root); | |
5d4f98a2 | 3151 | } |
0257bb82 | 3152 | WARN_ON(nr != cluster->nr); |
efa56464 | 3153 | out: |
5d4f98a2 | 3154 | kfree(ra); |
5d4f98a2 YZ |
3155 | return ret; |
3156 | } | |
3157 | ||
3158 | static noinline_for_stack | |
0257bb82 YZ |
3159 | int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key, |
3160 | struct file_extent_cluster *cluster) | |
5d4f98a2 | 3161 | { |
0257bb82 | 3162 | int ret; |
5d4f98a2 | 3163 | |
0257bb82 YZ |
3164 | if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) { |
3165 | ret = relocate_file_extent_cluster(inode, cluster); | |
3166 | if (ret) | |
3167 | return ret; | |
3168 | cluster->nr = 0; | |
5d4f98a2 | 3169 | } |
5d4f98a2 | 3170 | |
0257bb82 YZ |
3171 | if (!cluster->nr) |
3172 | cluster->start = extent_key->objectid; | |
3173 | else | |
3174 | BUG_ON(cluster->nr >= MAX_EXTENTS); | |
3175 | cluster->end = extent_key->objectid + extent_key->offset - 1; | |
3176 | cluster->boundary[cluster->nr] = extent_key->objectid; | |
3177 | cluster->nr++; | |
3178 | ||
3179 | if (cluster->nr >= MAX_EXTENTS) { | |
3180 | ret = relocate_file_extent_cluster(inode, cluster); | |
3181 | if (ret) | |
3182 | return ret; | |
3183 | cluster->nr = 0; | |
3184 | } | |
3185 | return 0; | |
5d4f98a2 YZ |
3186 | } |
3187 | ||
3188 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3189 | static int get_ref_objectid_v0(struct reloc_control *rc, | |
3190 | struct btrfs_path *path, | |
3191 | struct btrfs_key *extent_key, | |
3192 | u64 *ref_objectid, int *path_change) | |
3193 | { | |
3194 | struct btrfs_key key; | |
3195 | struct extent_buffer *leaf; | |
3196 | struct btrfs_extent_ref_v0 *ref0; | |
3197 | int ret; | |
3198 | int slot; | |
3199 | ||
3200 | leaf = path->nodes[0]; | |
3201 | slot = path->slots[0]; | |
3202 | while (1) { | |
3203 | if (slot >= btrfs_header_nritems(leaf)) { | |
3204 | ret = btrfs_next_leaf(rc->extent_root, path); | |
3205 | if (ret < 0) | |
3206 | return ret; | |
3207 | BUG_ON(ret > 0); | |
3208 | leaf = path->nodes[0]; | |
3209 | slot = path->slots[0]; | |
3210 | if (path_change) | |
3211 | *path_change = 1; | |
3212 | } | |
3213 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
3214 | if (key.objectid != extent_key->objectid) | |
3215 | return -ENOENT; | |
3216 | ||
3217 | if (key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
3218 | slot++; | |
3219 | continue; | |
3220 | } | |
3221 | ref0 = btrfs_item_ptr(leaf, slot, | |
3222 | struct btrfs_extent_ref_v0); | |
3223 | *ref_objectid = btrfs_ref_objectid_v0(leaf, ref0); | |
3224 | break; | |
3225 | } | |
3226 | return 0; | |
3227 | } | |
3228 | #endif | |
3229 | ||
3230 | /* | |
3231 | * helper to add a tree block to the list. | |
3232 | * the major work is getting the generation and level of the block | |
3233 | */ | |
3234 | static int add_tree_block(struct reloc_control *rc, | |
3235 | struct btrfs_key *extent_key, | |
3236 | struct btrfs_path *path, | |
3237 | struct rb_root *blocks) | |
3238 | { | |
3239 | struct extent_buffer *eb; | |
3240 | struct btrfs_extent_item *ei; | |
3241 | struct btrfs_tree_block_info *bi; | |
3242 | struct tree_block *block; | |
3243 | struct rb_node *rb_node; | |
3244 | u32 item_size; | |
3245 | int level = -1; | |
3246 | int generation; | |
3247 | ||
3248 | eb = path->nodes[0]; | |
3249 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
3250 | ||
3173a18f JB |
3251 | if (extent_key->type == BTRFS_METADATA_ITEM_KEY || |
3252 | item_size >= sizeof(*ei) + sizeof(*bi)) { | |
5d4f98a2 YZ |
3253 | ei = btrfs_item_ptr(eb, path->slots[0], |
3254 | struct btrfs_extent_item); | |
3173a18f JB |
3255 | if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) { |
3256 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
3257 | level = btrfs_tree_block_level(eb, bi); | |
3258 | } else { | |
3259 | level = (int)extent_key->offset; | |
3260 | } | |
5d4f98a2 | 3261 | generation = btrfs_extent_generation(eb, ei); |
5d4f98a2 YZ |
3262 | } else { |
3263 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3264 | u64 ref_owner; | |
3265 | int ret; | |
3266 | ||
3267 | BUG_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
3268 | ret = get_ref_objectid_v0(rc, path, extent_key, | |
3269 | &ref_owner, NULL); | |
411fc6bc AK |
3270 | if (ret < 0) |
3271 | return ret; | |
5d4f98a2 YZ |
3272 | BUG_ON(ref_owner >= BTRFS_MAX_LEVEL); |
3273 | level = (int)ref_owner; | |
3274 | /* FIXME: get real generation */ | |
3275 | generation = 0; | |
3276 | #else | |
3277 | BUG(); | |
3278 | #endif | |
3279 | } | |
3280 | ||
b3b4aa74 | 3281 | btrfs_release_path(path); |
5d4f98a2 YZ |
3282 | |
3283 | BUG_ON(level == -1); | |
3284 | ||
3285 | block = kmalloc(sizeof(*block), GFP_NOFS); | |
3286 | if (!block) | |
3287 | return -ENOMEM; | |
3288 | ||
3289 | block->bytenr = extent_key->objectid; | |
3173a18f | 3290 | block->key.objectid = rc->extent_root->leafsize; |
5d4f98a2 YZ |
3291 | block->key.offset = generation; |
3292 | block->level = level; | |
3293 | block->key_ready = 0; | |
3294 | ||
3295 | rb_node = tree_insert(blocks, block->bytenr, &block->rb_node); | |
43c04fb1 JM |
3296 | if (rb_node) |
3297 | backref_tree_panic(rb_node, -EEXIST, block->bytenr); | |
5d4f98a2 YZ |
3298 | |
3299 | return 0; | |
3300 | } | |
3301 | ||
3302 | /* | |
3303 | * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY | |
3304 | */ | |
3305 | static int __add_tree_block(struct reloc_control *rc, | |
3306 | u64 bytenr, u32 blocksize, | |
3307 | struct rb_root *blocks) | |
3308 | { | |
3309 | struct btrfs_path *path; | |
3310 | struct btrfs_key key; | |
3311 | int ret; | |
aee68ee5 JB |
3312 | bool skinny = btrfs_fs_incompat(rc->extent_root->fs_info, |
3313 | SKINNY_METADATA); | |
5d4f98a2 YZ |
3314 | |
3315 | if (tree_block_processed(bytenr, blocksize, rc)) | |
3316 | return 0; | |
3317 | ||
3318 | if (tree_search(blocks, bytenr)) | |
3319 | return 0; | |
3320 | ||
3321 | path = btrfs_alloc_path(); | |
3322 | if (!path) | |
3323 | return -ENOMEM; | |
aee68ee5 | 3324 | again: |
5d4f98a2 | 3325 | key.objectid = bytenr; |
aee68ee5 JB |
3326 | if (skinny) { |
3327 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3328 | key.offset = (u64)-1; | |
3329 | } else { | |
3330 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3331 | key.offset = blocksize; | |
3332 | } | |
5d4f98a2 YZ |
3333 | |
3334 | path->search_commit_root = 1; | |
3335 | path->skip_locking = 1; | |
3336 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); | |
3337 | if (ret < 0) | |
3338 | goto out; | |
5d4f98a2 | 3339 | |
aee68ee5 JB |
3340 | if (ret > 0 && skinny) { |
3341 | if (path->slots[0]) { | |
3342 | path->slots[0]--; | |
3343 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3344 | path->slots[0]); | |
3345 | if (key.objectid == bytenr && | |
3346 | (key.type == BTRFS_METADATA_ITEM_KEY || | |
3347 | (key.type == BTRFS_EXTENT_ITEM_KEY && | |
3348 | key.offset == blocksize))) | |
3349 | ret = 0; | |
3350 | } | |
3351 | ||
3352 | if (ret) { | |
3353 | skinny = false; | |
3354 | btrfs_release_path(path); | |
3355 | goto again; | |
3356 | } | |
3173a18f JB |
3357 | } |
3358 | BUG_ON(ret); | |
3359 | ||
5d4f98a2 YZ |
3360 | ret = add_tree_block(rc, &key, path, blocks); |
3361 | out: | |
3362 | btrfs_free_path(path); | |
3363 | return ret; | |
3364 | } | |
3365 | ||
3366 | /* | |
3367 | * helper to check if the block use full backrefs for pointers in it | |
3368 | */ | |
3369 | static int block_use_full_backref(struct reloc_control *rc, | |
3370 | struct extent_buffer *eb) | |
3371 | { | |
5d4f98a2 YZ |
3372 | u64 flags; |
3373 | int ret; | |
3374 | ||
3375 | if (btrfs_header_flag(eb, BTRFS_HEADER_FLAG_RELOC) || | |
3376 | btrfs_header_backref_rev(eb) < BTRFS_MIXED_BACKREF_REV) | |
3377 | return 1; | |
3378 | ||
3fd0a558 | 3379 | ret = btrfs_lookup_extent_info(NULL, rc->extent_root, |
3173a18f JB |
3380 | eb->start, btrfs_header_level(eb), 1, |
3381 | NULL, &flags); | |
5d4f98a2 YZ |
3382 | BUG_ON(ret); |
3383 | ||
5d4f98a2 YZ |
3384 | if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
3385 | ret = 1; | |
3386 | else | |
3387 | ret = 0; | |
5d4f98a2 YZ |
3388 | return ret; |
3389 | } | |
3390 | ||
0af3d00b JB |
3391 | static int delete_block_group_cache(struct btrfs_fs_info *fs_info, |
3392 | struct inode *inode, u64 ino) | |
3393 | { | |
3394 | struct btrfs_key key; | |
3395 | struct btrfs_path *path; | |
3396 | struct btrfs_root *root = fs_info->tree_root; | |
3397 | struct btrfs_trans_handle *trans; | |
0af3d00b JB |
3398 | int ret = 0; |
3399 | ||
3400 | if (inode) | |
3401 | goto truncate; | |
3402 | ||
3403 | key.objectid = ino; | |
3404 | key.type = BTRFS_INODE_ITEM_KEY; | |
3405 | key.offset = 0; | |
3406 | ||
3407 | inode = btrfs_iget(fs_info->sb, &key, root, NULL); | |
f54fb859 TI |
3408 | if (IS_ERR(inode) || is_bad_inode(inode)) { |
3409 | if (!IS_ERR(inode)) | |
0af3d00b JB |
3410 | iput(inode); |
3411 | return -ENOENT; | |
3412 | } | |
3413 | ||
3414 | truncate: | |
7b61cd92 MX |
3415 | ret = btrfs_check_trunc_cache_free_space(root, |
3416 | &fs_info->global_block_rsv); | |
3417 | if (ret) | |
3418 | goto out; | |
3419 | ||
0af3d00b JB |
3420 | path = btrfs_alloc_path(); |
3421 | if (!path) { | |
3422 | ret = -ENOMEM; | |
3423 | goto out; | |
3424 | } | |
3425 | ||
7a7eaa40 | 3426 | trans = btrfs_join_transaction(root); |
0af3d00b JB |
3427 | if (IS_ERR(trans)) { |
3428 | btrfs_free_path(path); | |
3612b495 | 3429 | ret = PTR_ERR(trans); |
0af3d00b JB |
3430 | goto out; |
3431 | } | |
3432 | ||
3433 | ret = btrfs_truncate_free_space_cache(root, trans, path, inode); | |
3434 | ||
3435 | btrfs_free_path(path); | |
0af3d00b | 3436 | btrfs_end_transaction(trans, root); |
b53d3f5d | 3437 | btrfs_btree_balance_dirty(root); |
0af3d00b JB |
3438 | out: |
3439 | iput(inode); | |
3440 | return ret; | |
3441 | } | |
3442 | ||
5d4f98a2 YZ |
3443 | /* |
3444 | * helper to add tree blocks for backref of type BTRFS_EXTENT_DATA_REF_KEY | |
3445 | * this function scans fs tree to find blocks reference the data extent | |
3446 | */ | |
3447 | static int find_data_references(struct reloc_control *rc, | |
3448 | struct btrfs_key *extent_key, | |
3449 | struct extent_buffer *leaf, | |
3450 | struct btrfs_extent_data_ref *ref, | |
3451 | struct rb_root *blocks) | |
3452 | { | |
3453 | struct btrfs_path *path; | |
3454 | struct tree_block *block; | |
3455 | struct btrfs_root *root; | |
3456 | struct btrfs_file_extent_item *fi; | |
3457 | struct rb_node *rb_node; | |
3458 | struct btrfs_key key; | |
3459 | u64 ref_root; | |
3460 | u64 ref_objectid; | |
3461 | u64 ref_offset; | |
3462 | u32 ref_count; | |
3463 | u32 nritems; | |
3464 | int err = 0; | |
3465 | int added = 0; | |
3466 | int counted; | |
3467 | int ret; | |
3468 | ||
5d4f98a2 YZ |
3469 | ref_root = btrfs_extent_data_ref_root(leaf, ref); |
3470 | ref_objectid = btrfs_extent_data_ref_objectid(leaf, ref); | |
3471 | ref_offset = btrfs_extent_data_ref_offset(leaf, ref); | |
3472 | ref_count = btrfs_extent_data_ref_count(leaf, ref); | |
3473 | ||
0af3d00b JB |
3474 | /* |
3475 | * This is an extent belonging to the free space cache, lets just delete | |
3476 | * it and redo the search. | |
3477 | */ | |
3478 | if (ref_root == BTRFS_ROOT_TREE_OBJECTID) { | |
3479 | ret = delete_block_group_cache(rc->extent_root->fs_info, | |
3480 | NULL, ref_objectid); | |
3481 | if (ret != -ENOENT) | |
3482 | return ret; | |
3483 | ret = 0; | |
3484 | } | |
3485 | ||
3486 | path = btrfs_alloc_path(); | |
3487 | if (!path) | |
3488 | return -ENOMEM; | |
026fd317 | 3489 | path->reada = 1; |
0af3d00b | 3490 | |
5d4f98a2 YZ |
3491 | root = read_fs_root(rc->extent_root->fs_info, ref_root); |
3492 | if (IS_ERR(root)) { | |
3493 | err = PTR_ERR(root); | |
3494 | goto out; | |
3495 | } | |
3496 | ||
3497 | key.objectid = ref_objectid; | |
5d4f98a2 | 3498 | key.type = BTRFS_EXTENT_DATA_KEY; |
84850e8d YZ |
3499 | if (ref_offset > ((u64)-1 << 32)) |
3500 | key.offset = 0; | |
3501 | else | |
3502 | key.offset = ref_offset; | |
5d4f98a2 YZ |
3503 | |
3504 | path->search_commit_root = 1; | |
3505 | path->skip_locking = 1; | |
3506 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3507 | if (ret < 0) { | |
3508 | err = ret; | |
3509 | goto out; | |
3510 | } | |
3511 | ||
3512 | leaf = path->nodes[0]; | |
3513 | nritems = btrfs_header_nritems(leaf); | |
3514 | /* | |
3515 | * the references in tree blocks that use full backrefs | |
3516 | * are not counted in | |
3517 | */ | |
3518 | if (block_use_full_backref(rc, leaf)) | |
3519 | counted = 0; | |
3520 | else | |
3521 | counted = 1; | |
3522 | rb_node = tree_search(blocks, leaf->start); | |
3523 | if (rb_node) { | |
3524 | if (counted) | |
3525 | added = 1; | |
3526 | else | |
3527 | path->slots[0] = nritems; | |
3528 | } | |
3529 | ||
3530 | while (ref_count > 0) { | |
3531 | while (path->slots[0] >= nritems) { | |
3532 | ret = btrfs_next_leaf(root, path); | |
3533 | if (ret < 0) { | |
3534 | err = ret; | |
3535 | goto out; | |
3536 | } | |
3537 | if (ret > 0) { | |
3538 | WARN_ON(1); | |
3539 | goto out; | |
3540 | } | |
3541 | ||
3542 | leaf = path->nodes[0]; | |
3543 | nritems = btrfs_header_nritems(leaf); | |
3544 | added = 0; | |
3545 | ||
3546 | if (block_use_full_backref(rc, leaf)) | |
3547 | counted = 0; | |
3548 | else | |
3549 | counted = 1; | |
3550 | rb_node = tree_search(blocks, leaf->start); | |
3551 | if (rb_node) { | |
3552 | if (counted) | |
3553 | added = 1; | |
3554 | else | |
3555 | path->slots[0] = nritems; | |
3556 | } | |
3557 | } | |
3558 | ||
3559 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
3560 | if (key.objectid != ref_objectid || | |
3561 | key.type != BTRFS_EXTENT_DATA_KEY) { | |
3562 | WARN_ON(1); | |
3563 | break; | |
3564 | } | |
3565 | ||
3566 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
3567 | struct btrfs_file_extent_item); | |
3568 | ||
3569 | if (btrfs_file_extent_type(leaf, fi) == | |
3570 | BTRFS_FILE_EXTENT_INLINE) | |
3571 | goto next; | |
3572 | ||
3573 | if (btrfs_file_extent_disk_bytenr(leaf, fi) != | |
3574 | extent_key->objectid) | |
3575 | goto next; | |
3576 | ||
3577 | key.offset -= btrfs_file_extent_offset(leaf, fi); | |
3578 | if (key.offset != ref_offset) | |
3579 | goto next; | |
3580 | ||
3581 | if (counted) | |
3582 | ref_count--; | |
3583 | if (added) | |
3584 | goto next; | |
3585 | ||
3586 | if (!tree_block_processed(leaf->start, leaf->len, rc)) { | |
3587 | block = kmalloc(sizeof(*block), GFP_NOFS); | |
3588 | if (!block) { | |
3589 | err = -ENOMEM; | |
3590 | break; | |
3591 | } | |
3592 | block->bytenr = leaf->start; | |
3593 | btrfs_item_key_to_cpu(leaf, &block->key, 0); | |
3594 | block->level = 0; | |
3595 | block->key_ready = 1; | |
3596 | rb_node = tree_insert(blocks, block->bytenr, | |
3597 | &block->rb_node); | |
43c04fb1 JM |
3598 | if (rb_node) |
3599 | backref_tree_panic(rb_node, -EEXIST, | |
3600 | block->bytenr); | |
5d4f98a2 YZ |
3601 | } |
3602 | if (counted) | |
3603 | added = 1; | |
3604 | else | |
3605 | path->slots[0] = nritems; | |
3606 | next: | |
3607 | path->slots[0]++; | |
3608 | ||
3609 | } | |
3610 | out: | |
3611 | btrfs_free_path(path); | |
3612 | return err; | |
3613 | } | |
3614 | ||
3615 | /* | |
2c016dc2 | 3616 | * helper to find all tree blocks that reference a given data extent |
5d4f98a2 YZ |
3617 | */ |
3618 | static noinline_for_stack | |
3619 | int add_data_references(struct reloc_control *rc, | |
3620 | struct btrfs_key *extent_key, | |
3621 | struct btrfs_path *path, | |
3622 | struct rb_root *blocks) | |
3623 | { | |
3624 | struct btrfs_key key; | |
3625 | struct extent_buffer *eb; | |
3626 | struct btrfs_extent_data_ref *dref; | |
3627 | struct btrfs_extent_inline_ref *iref; | |
3628 | unsigned long ptr; | |
3629 | unsigned long end; | |
3fd0a558 | 3630 | u32 blocksize = btrfs_level_size(rc->extent_root, 0); |
5d4f98a2 YZ |
3631 | int ret; |
3632 | int err = 0; | |
3633 | ||
5d4f98a2 YZ |
3634 | eb = path->nodes[0]; |
3635 | ptr = btrfs_item_ptr_offset(eb, path->slots[0]); | |
3636 | end = ptr + btrfs_item_size_nr(eb, path->slots[0]); | |
3637 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3638 | if (ptr + sizeof(struct btrfs_extent_item_v0) == end) | |
3639 | ptr = end; | |
3640 | else | |
3641 | #endif | |
3642 | ptr += sizeof(struct btrfs_extent_item); | |
3643 | ||
3644 | while (ptr < end) { | |
3645 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
3646 | key.type = btrfs_extent_inline_ref_type(eb, iref); | |
3647 | if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
3648 | key.offset = btrfs_extent_inline_ref_offset(eb, iref); | |
3649 | ret = __add_tree_block(rc, key.offset, blocksize, | |
3650 | blocks); | |
3651 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
3652 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
3653 | ret = find_data_references(rc, extent_key, | |
3654 | eb, dref, blocks); | |
3655 | } else { | |
3656 | BUG(); | |
3657 | } | |
3658 | ptr += btrfs_extent_inline_ref_size(key.type); | |
3659 | } | |
3660 | WARN_ON(ptr > end); | |
3661 | ||
3662 | while (1) { | |
3663 | cond_resched(); | |
3664 | eb = path->nodes[0]; | |
3665 | if (path->slots[0] >= btrfs_header_nritems(eb)) { | |
3666 | ret = btrfs_next_leaf(rc->extent_root, path); | |
3667 | if (ret < 0) { | |
3668 | err = ret; | |
3669 | break; | |
3670 | } | |
3671 | if (ret > 0) | |
3672 | break; | |
3673 | eb = path->nodes[0]; | |
3674 | } | |
3675 | ||
3676 | btrfs_item_key_to_cpu(eb, &key, path->slots[0]); | |
3677 | if (key.objectid != extent_key->objectid) | |
3678 | break; | |
3679 | ||
3680 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3681 | if (key.type == BTRFS_SHARED_DATA_REF_KEY || | |
3682 | key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
3683 | #else | |
3684 | BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); | |
3685 | if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
3686 | #endif | |
3687 | ret = __add_tree_block(rc, key.offset, blocksize, | |
3688 | blocks); | |
3689 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
3690 | dref = btrfs_item_ptr(eb, path->slots[0], | |
3691 | struct btrfs_extent_data_ref); | |
3692 | ret = find_data_references(rc, extent_key, | |
3693 | eb, dref, blocks); | |
3694 | } else { | |
3695 | ret = 0; | |
3696 | } | |
3697 | if (ret) { | |
3698 | err = ret; | |
3699 | break; | |
3700 | } | |
3701 | path->slots[0]++; | |
3702 | } | |
b3b4aa74 | 3703 | btrfs_release_path(path); |
5d4f98a2 YZ |
3704 | if (err) |
3705 | free_block_list(blocks); | |
3706 | return err; | |
3707 | } | |
3708 | ||
3709 | /* | |
2c016dc2 | 3710 | * helper to find next unprocessed extent |
5d4f98a2 YZ |
3711 | */ |
3712 | static noinline_for_stack | |
3713 | int find_next_extent(struct btrfs_trans_handle *trans, | |
3fd0a558 YZ |
3714 | struct reloc_control *rc, struct btrfs_path *path, |
3715 | struct btrfs_key *extent_key) | |
5d4f98a2 YZ |
3716 | { |
3717 | struct btrfs_key key; | |
3718 | struct extent_buffer *leaf; | |
3719 | u64 start, end, last; | |
3720 | int ret; | |
3721 | ||
3722 | last = rc->block_group->key.objectid + rc->block_group->key.offset; | |
3723 | while (1) { | |
3724 | cond_resched(); | |
3725 | if (rc->search_start >= last) { | |
3726 | ret = 1; | |
3727 | break; | |
3728 | } | |
3729 | ||
3730 | key.objectid = rc->search_start; | |
3731 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3732 | key.offset = 0; | |
3733 | ||
3734 | path->search_commit_root = 1; | |
3735 | path->skip_locking = 1; | |
3736 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, | |
3737 | 0, 0); | |
3738 | if (ret < 0) | |
3739 | break; | |
3740 | next: | |
3741 | leaf = path->nodes[0]; | |
3742 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
3743 | ret = btrfs_next_leaf(rc->extent_root, path); | |
3744 | if (ret != 0) | |
3745 | break; | |
3746 | leaf = path->nodes[0]; | |
3747 | } | |
3748 | ||
3749 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
3750 | if (key.objectid >= last) { | |
3751 | ret = 1; | |
3752 | break; | |
3753 | } | |
3754 | ||
3173a18f JB |
3755 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3756 | key.type != BTRFS_METADATA_ITEM_KEY) { | |
3757 | path->slots[0]++; | |
3758 | goto next; | |
3759 | } | |
3760 | ||
3761 | if (key.type == BTRFS_EXTENT_ITEM_KEY && | |
5d4f98a2 YZ |
3762 | key.objectid + key.offset <= rc->search_start) { |
3763 | path->slots[0]++; | |
3764 | goto next; | |
3765 | } | |
3766 | ||
3173a18f JB |
3767 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
3768 | key.objectid + rc->extent_root->leafsize <= | |
3769 | rc->search_start) { | |
3770 | path->slots[0]++; | |
3771 | goto next; | |
3772 | } | |
3773 | ||
5d4f98a2 YZ |
3774 | ret = find_first_extent_bit(&rc->processed_blocks, |
3775 | key.objectid, &start, &end, | |
e6138876 | 3776 | EXTENT_DIRTY, NULL); |
5d4f98a2 YZ |
3777 | |
3778 | if (ret == 0 && start <= key.objectid) { | |
b3b4aa74 | 3779 | btrfs_release_path(path); |
5d4f98a2 YZ |
3780 | rc->search_start = end + 1; |
3781 | } else { | |
3173a18f JB |
3782 | if (key.type == BTRFS_EXTENT_ITEM_KEY) |
3783 | rc->search_start = key.objectid + key.offset; | |
3784 | else | |
3785 | rc->search_start = key.objectid + | |
3786 | rc->extent_root->leafsize; | |
3fd0a558 | 3787 | memcpy(extent_key, &key, sizeof(key)); |
5d4f98a2 YZ |
3788 | return 0; |
3789 | } | |
3790 | } | |
b3b4aa74 | 3791 | btrfs_release_path(path); |
5d4f98a2 YZ |
3792 | return ret; |
3793 | } | |
3794 | ||
3795 | static void set_reloc_control(struct reloc_control *rc) | |
3796 | { | |
3797 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; | |
7585717f CM |
3798 | |
3799 | mutex_lock(&fs_info->reloc_mutex); | |
5d4f98a2 | 3800 | fs_info->reloc_ctl = rc; |
7585717f | 3801 | mutex_unlock(&fs_info->reloc_mutex); |
5d4f98a2 YZ |
3802 | } |
3803 | ||
3804 | static void unset_reloc_control(struct reloc_control *rc) | |
3805 | { | |
3806 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; | |
7585717f CM |
3807 | |
3808 | mutex_lock(&fs_info->reloc_mutex); | |
5d4f98a2 | 3809 | fs_info->reloc_ctl = NULL; |
7585717f | 3810 | mutex_unlock(&fs_info->reloc_mutex); |
5d4f98a2 YZ |
3811 | } |
3812 | ||
3813 | static int check_extent_flags(u64 flags) | |
3814 | { | |
3815 | if ((flags & BTRFS_EXTENT_FLAG_DATA) && | |
3816 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) | |
3817 | return 1; | |
3818 | if (!(flags & BTRFS_EXTENT_FLAG_DATA) && | |
3819 | !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) | |
3820 | return 1; | |
3821 | if ((flags & BTRFS_EXTENT_FLAG_DATA) && | |
3822 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
3823 | return 1; | |
3824 | return 0; | |
3825 | } | |
3826 | ||
3fd0a558 YZ |
3827 | static noinline_for_stack |
3828 | int prepare_to_relocate(struct reloc_control *rc) | |
3829 | { | |
3830 | struct btrfs_trans_handle *trans; | |
3831 | int ret; | |
3832 | ||
66d8f3dd MX |
3833 | rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root, |
3834 | BTRFS_BLOCK_RSV_TEMP); | |
3fd0a558 YZ |
3835 | if (!rc->block_rsv) |
3836 | return -ENOMEM; | |
3837 | ||
3838 | /* | |
3839 | * reserve some space for creating reloc trees. | |
3840 | * btrfs_init_reloc_root will use them when there | |
3841 | * is no reservation in transaction handle. | |
3842 | */ | |
4a92b1b8 | 3843 | ret = btrfs_block_rsv_add(rc->extent_root, rc->block_rsv, |
08e007d2 MX |
3844 | rc->extent_root->nodesize * 256, |
3845 | BTRFS_RESERVE_FLUSH_ALL); | |
3fd0a558 YZ |
3846 | if (ret) |
3847 | return ret; | |
3848 | ||
3fd0a558 YZ |
3849 | memset(&rc->cluster, 0, sizeof(rc->cluster)); |
3850 | rc->search_start = rc->block_group->key.objectid; | |
3851 | rc->extents_found = 0; | |
3852 | rc->nodes_relocated = 0; | |
3853 | rc->merging_rsv_size = 0; | |
3fd0a558 YZ |
3854 | |
3855 | rc->create_reloc_tree = 1; | |
3856 | set_reloc_control(rc); | |
3857 | ||
7a7eaa40 | 3858 | trans = btrfs_join_transaction(rc->extent_root); |
28818947 LB |
3859 | if (IS_ERR(trans)) { |
3860 | unset_reloc_control(rc); | |
3861 | /* | |
3862 | * extent tree is not a ref_cow tree and has no reloc_root to | |
3863 | * cleanup. And callers are responsible to free the above | |
3864 | * block rsv. | |
3865 | */ | |
3866 | return PTR_ERR(trans); | |
3867 | } | |
3fd0a558 YZ |
3868 | btrfs_commit_transaction(trans, rc->extent_root); |
3869 | return 0; | |
3870 | } | |
76dda93c | 3871 | |
5d4f98a2 YZ |
3872 | static noinline_for_stack int relocate_block_group(struct reloc_control *rc) |
3873 | { | |
3874 | struct rb_root blocks = RB_ROOT; | |
3875 | struct btrfs_key key; | |
3876 | struct btrfs_trans_handle *trans = NULL; | |
3877 | struct btrfs_path *path; | |
3878 | struct btrfs_extent_item *ei; | |
5d4f98a2 YZ |
3879 | u64 flags; |
3880 | u32 item_size; | |
3881 | int ret; | |
3882 | int err = 0; | |
c87f08ca | 3883 | int progress = 0; |
5d4f98a2 YZ |
3884 | |
3885 | path = btrfs_alloc_path(); | |
3fd0a558 | 3886 | if (!path) |
5d4f98a2 | 3887 | return -ENOMEM; |
026fd317 | 3888 | path->reada = 1; |
5d4f98a2 | 3889 | |
3fd0a558 YZ |
3890 | ret = prepare_to_relocate(rc); |
3891 | if (ret) { | |
3892 | err = ret; | |
3893 | goto out_free; | |
3894 | } | |
5d4f98a2 YZ |
3895 | |
3896 | while (1) { | |
c87f08ca | 3897 | progress++; |
a22285a6 | 3898 | trans = btrfs_start_transaction(rc->extent_root, 0); |
0f788c58 LB |
3899 | if (IS_ERR(trans)) { |
3900 | err = PTR_ERR(trans); | |
3901 | trans = NULL; | |
3902 | break; | |
3903 | } | |
c87f08ca | 3904 | restart: |
3fd0a558 YZ |
3905 | if (update_backref_cache(trans, &rc->backref_cache)) { |
3906 | btrfs_end_transaction(trans, rc->extent_root); | |
3907 | continue; | |
3908 | } | |
3909 | ||
3910 | ret = find_next_extent(trans, rc, path, &key); | |
5d4f98a2 YZ |
3911 | if (ret < 0) |
3912 | err = ret; | |
3913 | if (ret != 0) | |
3914 | break; | |
3915 | ||
3916 | rc->extents_found++; | |
3917 | ||
3918 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3919 | struct btrfs_extent_item); | |
3fd0a558 | 3920 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); |
5d4f98a2 YZ |
3921 | if (item_size >= sizeof(*ei)) { |
3922 | flags = btrfs_extent_flags(path->nodes[0], ei); | |
3923 | ret = check_extent_flags(flags); | |
3924 | BUG_ON(ret); | |
3925 | ||
3926 | } else { | |
3927 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3928 | u64 ref_owner; | |
3929 | int path_change = 0; | |
3930 | ||
3931 | BUG_ON(item_size != | |
3932 | sizeof(struct btrfs_extent_item_v0)); | |
3933 | ret = get_ref_objectid_v0(rc, path, &key, &ref_owner, | |
3934 | &path_change); | |
3935 | if (ref_owner < BTRFS_FIRST_FREE_OBJECTID) | |
3936 | flags = BTRFS_EXTENT_FLAG_TREE_BLOCK; | |
3937 | else | |
3938 | flags = BTRFS_EXTENT_FLAG_DATA; | |
3939 | ||
3940 | if (path_change) { | |
b3b4aa74 | 3941 | btrfs_release_path(path); |
5d4f98a2 YZ |
3942 | |
3943 | path->search_commit_root = 1; | |
3944 | path->skip_locking = 1; | |
3945 | ret = btrfs_search_slot(NULL, rc->extent_root, | |
3946 | &key, path, 0, 0); | |
3947 | if (ret < 0) { | |
3948 | err = ret; | |
3949 | break; | |
3950 | } | |
3951 | BUG_ON(ret > 0); | |
3952 | } | |
3953 | #else | |
3954 | BUG(); | |
3955 | #endif | |
3956 | } | |
3957 | ||
3958 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
3959 | ret = add_tree_block(rc, &key, path, &blocks); | |
3960 | } else if (rc->stage == UPDATE_DATA_PTRS && | |
3fd0a558 | 3961 | (flags & BTRFS_EXTENT_FLAG_DATA)) { |
5d4f98a2 YZ |
3962 | ret = add_data_references(rc, &key, path, &blocks); |
3963 | } else { | |
b3b4aa74 | 3964 | btrfs_release_path(path); |
5d4f98a2 YZ |
3965 | ret = 0; |
3966 | } | |
3967 | if (ret < 0) { | |
3fd0a558 | 3968 | err = ret; |
5d4f98a2 YZ |
3969 | break; |
3970 | } | |
3971 | ||
3972 | if (!RB_EMPTY_ROOT(&blocks)) { | |
3973 | ret = relocate_tree_blocks(trans, rc, &blocks); | |
3974 | if (ret < 0) { | |
3fd0a558 YZ |
3975 | if (ret != -EAGAIN) { |
3976 | err = ret; | |
3977 | break; | |
3978 | } | |
3979 | rc->extents_found--; | |
3980 | rc->search_start = key.objectid; | |
3981 | } | |
3982 | } | |
3983 | ||
36ba022a | 3984 | ret = btrfs_block_rsv_check(rc->extent_root, rc->block_rsv, 5); |
3fd0a558 | 3985 | if (ret < 0) { |
7654b724 | 3986 | if (ret != -ENOSPC) { |
5d4f98a2 | 3987 | err = ret; |
3fd0a558 | 3988 | WARN_ON(1); |
5d4f98a2 YZ |
3989 | break; |
3990 | } | |
3fd0a558 | 3991 | rc->commit_transaction = 1; |
5d4f98a2 YZ |
3992 | } |
3993 | ||
3fd0a558 YZ |
3994 | if (rc->commit_transaction) { |
3995 | rc->commit_transaction = 0; | |
3996 | ret = btrfs_commit_transaction(trans, rc->extent_root); | |
3997 | BUG_ON(ret); | |
3998 | } else { | |
3fd0a558 | 3999 | btrfs_end_transaction_throttle(trans, rc->extent_root); |
b53d3f5d | 4000 | btrfs_btree_balance_dirty(rc->extent_root); |
3fd0a558 | 4001 | } |
5d4f98a2 | 4002 | trans = NULL; |
5d4f98a2 YZ |
4003 | |
4004 | if (rc->stage == MOVE_DATA_EXTENTS && | |
4005 | (flags & BTRFS_EXTENT_FLAG_DATA)) { | |
4006 | rc->found_file_extent = 1; | |
0257bb82 | 4007 | ret = relocate_data_extent(rc->data_inode, |
3fd0a558 | 4008 | &key, &rc->cluster); |
5d4f98a2 YZ |
4009 | if (ret < 0) { |
4010 | err = ret; | |
4011 | break; | |
4012 | } | |
4013 | } | |
4014 | } | |
c87f08ca CM |
4015 | if (trans && progress && err == -ENOSPC) { |
4016 | ret = btrfs_force_chunk_alloc(trans, rc->extent_root, | |
4017 | rc->block_group->flags); | |
4018 | if (ret == 0) { | |
4019 | err = 0; | |
4020 | progress = 0; | |
4021 | goto restart; | |
4022 | } | |
4023 | } | |
3fd0a558 | 4024 | |
b3b4aa74 | 4025 | btrfs_release_path(path); |
3fd0a558 YZ |
4026 | clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY, |
4027 | GFP_NOFS); | |
5d4f98a2 YZ |
4028 | |
4029 | if (trans) { | |
3fd0a558 | 4030 | btrfs_end_transaction_throttle(trans, rc->extent_root); |
b53d3f5d | 4031 | btrfs_btree_balance_dirty(rc->extent_root); |
5d4f98a2 YZ |
4032 | } |
4033 | ||
0257bb82 | 4034 | if (!err) { |
3fd0a558 YZ |
4035 | ret = relocate_file_extent_cluster(rc->data_inode, |
4036 | &rc->cluster); | |
0257bb82 YZ |
4037 | if (ret < 0) |
4038 | err = ret; | |
4039 | } | |
4040 | ||
3fd0a558 YZ |
4041 | rc->create_reloc_tree = 0; |
4042 | set_reloc_control(rc); | |
0257bb82 | 4043 | |
3fd0a558 YZ |
4044 | backref_cache_cleanup(&rc->backref_cache); |
4045 | btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, (u64)-1); | |
5d4f98a2 | 4046 | |
3fd0a558 | 4047 | err = prepare_to_merge(rc, err); |
5d4f98a2 YZ |
4048 | |
4049 | merge_reloc_roots(rc); | |
4050 | ||
3fd0a558 | 4051 | rc->merge_reloc_tree = 0; |
5d4f98a2 | 4052 | unset_reloc_control(rc); |
3fd0a558 | 4053 | btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, (u64)-1); |
5d4f98a2 YZ |
4054 | |
4055 | /* get rid of pinned extents */ | |
7a7eaa40 | 4056 | trans = btrfs_join_transaction(rc->extent_root); |
3612b495 TI |
4057 | if (IS_ERR(trans)) |
4058 | err = PTR_ERR(trans); | |
4059 | else | |
4060 | btrfs_commit_transaction(trans, rc->extent_root); | |
3fd0a558 YZ |
4061 | out_free: |
4062 | btrfs_free_block_rsv(rc->extent_root, rc->block_rsv); | |
4063 | btrfs_free_path(path); | |
5d4f98a2 YZ |
4064 | return err; |
4065 | } | |
4066 | ||
4067 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, | |
0257bb82 | 4068 | struct btrfs_root *root, u64 objectid) |
5d4f98a2 YZ |
4069 | { |
4070 | struct btrfs_path *path; | |
4071 | struct btrfs_inode_item *item; | |
4072 | struct extent_buffer *leaf; | |
4073 | int ret; | |
4074 | ||
4075 | path = btrfs_alloc_path(); | |
4076 | if (!path) | |
4077 | return -ENOMEM; | |
4078 | ||
4079 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); | |
4080 | if (ret) | |
4081 | goto out; | |
4082 | ||
4083 | leaf = path->nodes[0]; | |
4084 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); | |
4085 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
4086 | btrfs_set_inode_generation(leaf, item, 1); | |
0257bb82 | 4087 | btrfs_set_inode_size(leaf, item, 0); |
5d4f98a2 | 4088 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); |
3fd0a558 YZ |
4089 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS | |
4090 | BTRFS_INODE_PREALLOC); | |
5d4f98a2 | 4091 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 4092 | btrfs_release_path(path); |
5d4f98a2 YZ |
4093 | out: |
4094 | btrfs_free_path(path); | |
4095 | return ret; | |
4096 | } | |
4097 | ||
4098 | /* | |
4099 | * helper to create inode for data relocation. | |
4100 | * the inode is in data relocation tree and its link count is 0 | |
4101 | */ | |
3fd0a558 YZ |
4102 | static noinline_for_stack |
4103 | struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, | |
4104 | struct btrfs_block_group_cache *group) | |
5d4f98a2 YZ |
4105 | { |
4106 | struct inode *inode = NULL; | |
4107 | struct btrfs_trans_handle *trans; | |
4108 | struct btrfs_root *root; | |
4109 | struct btrfs_key key; | |
5d4f98a2 YZ |
4110 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; |
4111 | int err = 0; | |
4112 | ||
4113 | root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); | |
4114 | if (IS_ERR(root)) | |
4115 | return ERR_CAST(root); | |
4116 | ||
a22285a6 | 4117 | trans = btrfs_start_transaction(root, 6); |
3fd0a558 YZ |
4118 | if (IS_ERR(trans)) |
4119 | return ERR_CAST(trans); | |
5d4f98a2 | 4120 | |
581bb050 | 4121 | err = btrfs_find_free_objectid(root, &objectid); |
5d4f98a2 YZ |
4122 | if (err) |
4123 | goto out; | |
4124 | ||
0257bb82 | 4125 | err = __insert_orphan_inode(trans, root, objectid); |
5d4f98a2 YZ |
4126 | BUG_ON(err); |
4127 | ||
4128 | key.objectid = objectid; | |
4129 | key.type = BTRFS_INODE_ITEM_KEY; | |
4130 | key.offset = 0; | |
73f73415 | 4131 | inode = btrfs_iget(root->fs_info->sb, &key, root, NULL); |
5d4f98a2 YZ |
4132 | BUG_ON(IS_ERR(inode) || is_bad_inode(inode)); |
4133 | BTRFS_I(inode)->index_cnt = group->key.objectid; | |
4134 | ||
4135 | err = btrfs_orphan_add(trans, inode); | |
4136 | out: | |
5d4f98a2 | 4137 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4138 | btrfs_btree_balance_dirty(root); |
5d4f98a2 YZ |
4139 | if (err) { |
4140 | if (inode) | |
4141 | iput(inode); | |
4142 | inode = ERR_PTR(err); | |
4143 | } | |
4144 | return inode; | |
4145 | } | |
4146 | ||
a9995eec | 4147 | static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info) |
3fd0a558 YZ |
4148 | { |
4149 | struct reloc_control *rc; | |
4150 | ||
4151 | rc = kzalloc(sizeof(*rc), GFP_NOFS); | |
4152 | if (!rc) | |
4153 | return NULL; | |
4154 | ||
4155 | INIT_LIST_HEAD(&rc->reloc_roots); | |
4156 | backref_cache_init(&rc->backref_cache); | |
4157 | mapping_tree_init(&rc->reloc_root_tree); | |
a9995eec JB |
4158 | extent_io_tree_init(&rc->processed_blocks, |
4159 | fs_info->btree_inode->i_mapping); | |
3fd0a558 YZ |
4160 | return rc; |
4161 | } | |
4162 | ||
5d4f98a2 YZ |
4163 | /* |
4164 | * function to relocate all extents in a block group. | |
4165 | */ | |
4166 | int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start) | |
4167 | { | |
4168 | struct btrfs_fs_info *fs_info = extent_root->fs_info; | |
4169 | struct reloc_control *rc; | |
0af3d00b JB |
4170 | struct inode *inode; |
4171 | struct btrfs_path *path; | |
5d4f98a2 | 4172 | int ret; |
f0486c68 | 4173 | int rw = 0; |
5d4f98a2 YZ |
4174 | int err = 0; |
4175 | ||
a9995eec | 4176 | rc = alloc_reloc_control(fs_info); |
5d4f98a2 YZ |
4177 | if (!rc) |
4178 | return -ENOMEM; | |
4179 | ||
f0486c68 | 4180 | rc->extent_root = extent_root; |
3fd0a558 | 4181 | |
5d4f98a2 YZ |
4182 | rc->block_group = btrfs_lookup_block_group(fs_info, group_start); |
4183 | BUG_ON(!rc->block_group); | |
4184 | ||
f0486c68 YZ |
4185 | if (!rc->block_group->ro) { |
4186 | ret = btrfs_set_block_group_ro(extent_root, rc->block_group); | |
4187 | if (ret) { | |
4188 | err = ret; | |
4189 | goto out; | |
4190 | } | |
4191 | rw = 1; | |
4192 | } | |
4193 | ||
0af3d00b JB |
4194 | path = btrfs_alloc_path(); |
4195 | if (!path) { | |
4196 | err = -ENOMEM; | |
4197 | goto out; | |
4198 | } | |
4199 | ||
4200 | inode = lookup_free_space_inode(fs_info->tree_root, rc->block_group, | |
4201 | path); | |
4202 | btrfs_free_path(path); | |
4203 | ||
4204 | if (!IS_ERR(inode)) | |
4205 | ret = delete_block_group_cache(fs_info, inode, 0); | |
4206 | else | |
4207 | ret = PTR_ERR(inode); | |
4208 | ||
4209 | if (ret && ret != -ENOENT) { | |
4210 | err = ret; | |
4211 | goto out; | |
4212 | } | |
4213 | ||
5d4f98a2 YZ |
4214 | rc->data_inode = create_reloc_inode(fs_info, rc->block_group); |
4215 | if (IS_ERR(rc->data_inode)) { | |
4216 | err = PTR_ERR(rc->data_inode); | |
4217 | rc->data_inode = NULL; | |
4218 | goto out; | |
4219 | } | |
4220 | ||
4221 | printk(KERN_INFO "btrfs: relocating block group %llu flags %llu\n", | |
4222 | (unsigned long long)rc->block_group->key.objectid, | |
4223 | (unsigned long long)rc->block_group->flags); | |
4224 | ||
eb73c1b7 | 4225 | ret = btrfs_start_all_delalloc_inodes(fs_info, 0); |
8ccf6f19 MX |
4226 | if (ret < 0) { |
4227 | err = ret; | |
4228 | goto out; | |
4229 | } | |
199c2a9c | 4230 | btrfs_wait_all_ordered_extents(fs_info, 0); |
5d4f98a2 YZ |
4231 | |
4232 | while (1) { | |
76dda93c | 4233 | mutex_lock(&fs_info->cleaner_mutex); |
5d4f98a2 | 4234 | ret = relocate_block_group(rc); |
76dda93c | 4235 | mutex_unlock(&fs_info->cleaner_mutex); |
5d4f98a2 YZ |
4236 | if (ret < 0) { |
4237 | err = ret; | |
3fd0a558 | 4238 | goto out; |
5d4f98a2 YZ |
4239 | } |
4240 | ||
4241 | if (rc->extents_found == 0) | |
4242 | break; | |
4243 | ||
4244 | printk(KERN_INFO "btrfs: found %llu extents\n", | |
4245 | (unsigned long long)rc->extents_found); | |
4246 | ||
4247 | if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { | |
4248 | btrfs_wait_ordered_range(rc->data_inode, 0, (u64)-1); | |
4249 | invalidate_mapping_pages(rc->data_inode->i_mapping, | |
4250 | 0, -1); | |
4251 | rc->stage = UPDATE_DATA_PTRS; | |
5d4f98a2 YZ |
4252 | } |
4253 | } | |
4254 | ||
0257bb82 YZ |
4255 | filemap_write_and_wait_range(fs_info->btree_inode->i_mapping, |
4256 | rc->block_group->key.objectid, | |
4257 | rc->block_group->key.objectid + | |
4258 | rc->block_group->key.offset - 1); | |
5d4f98a2 YZ |
4259 | |
4260 | WARN_ON(rc->block_group->pinned > 0); | |
4261 | WARN_ON(rc->block_group->reserved > 0); | |
4262 | WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0); | |
4263 | out: | |
f0486c68 YZ |
4264 | if (err && rw) |
4265 | btrfs_set_block_group_rw(extent_root, rc->block_group); | |
5d4f98a2 | 4266 | iput(rc->data_inode); |
5d4f98a2 YZ |
4267 | btrfs_put_block_group(rc->block_group); |
4268 | kfree(rc); | |
4269 | return err; | |
4270 | } | |
4271 | ||
76dda93c YZ |
4272 | static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) |
4273 | { | |
4274 | struct btrfs_trans_handle *trans; | |
79787eaa | 4275 | int ret, err; |
76dda93c | 4276 | |
a22285a6 | 4277 | trans = btrfs_start_transaction(root->fs_info->tree_root, 0); |
79787eaa JM |
4278 | if (IS_ERR(trans)) |
4279 | return PTR_ERR(trans); | |
76dda93c YZ |
4280 | |
4281 | memset(&root->root_item.drop_progress, 0, | |
4282 | sizeof(root->root_item.drop_progress)); | |
4283 | root->root_item.drop_level = 0; | |
4284 | btrfs_set_root_refs(&root->root_item, 0); | |
4285 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4286 | &root->root_key, &root->root_item); | |
76dda93c | 4287 | |
79787eaa JM |
4288 | err = btrfs_end_transaction(trans, root->fs_info->tree_root); |
4289 | if (err) | |
4290 | return err; | |
4291 | return ret; | |
76dda93c YZ |
4292 | } |
4293 | ||
5d4f98a2 YZ |
4294 | /* |
4295 | * recover relocation interrupted by system crash. | |
4296 | * | |
4297 | * this function resumes merging reloc trees with corresponding fs trees. | |
4298 | * this is important for keeping the sharing of tree blocks | |
4299 | */ | |
4300 | int btrfs_recover_relocation(struct btrfs_root *root) | |
4301 | { | |
4302 | LIST_HEAD(reloc_roots); | |
4303 | struct btrfs_key key; | |
4304 | struct btrfs_root *fs_root; | |
4305 | struct btrfs_root *reloc_root; | |
4306 | struct btrfs_path *path; | |
4307 | struct extent_buffer *leaf; | |
4308 | struct reloc_control *rc = NULL; | |
4309 | struct btrfs_trans_handle *trans; | |
4310 | int ret; | |
4311 | int err = 0; | |
4312 | ||
4313 | path = btrfs_alloc_path(); | |
4314 | if (!path) | |
4315 | return -ENOMEM; | |
026fd317 | 4316 | path->reada = -1; |
5d4f98a2 YZ |
4317 | |
4318 | key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
4319 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4320 | key.offset = (u64)-1; | |
4321 | ||
4322 | while (1) { | |
4323 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, | |
4324 | path, 0, 0); | |
4325 | if (ret < 0) { | |
4326 | err = ret; | |
4327 | goto out; | |
4328 | } | |
4329 | if (ret > 0) { | |
4330 | if (path->slots[0] == 0) | |
4331 | break; | |
4332 | path->slots[0]--; | |
4333 | } | |
4334 | leaf = path->nodes[0]; | |
4335 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 4336 | btrfs_release_path(path); |
5d4f98a2 YZ |
4337 | |
4338 | if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || | |
4339 | key.type != BTRFS_ROOT_ITEM_KEY) | |
4340 | break; | |
4341 | ||
cb517eab | 4342 | reloc_root = btrfs_read_fs_root(root, &key); |
5d4f98a2 YZ |
4343 | if (IS_ERR(reloc_root)) { |
4344 | err = PTR_ERR(reloc_root); | |
4345 | goto out; | |
4346 | } | |
4347 | ||
4348 | list_add(&reloc_root->root_list, &reloc_roots); | |
4349 | ||
4350 | if (btrfs_root_refs(&reloc_root->root_item) > 0) { | |
4351 | fs_root = read_fs_root(root->fs_info, | |
4352 | reloc_root->root_key.offset); | |
4353 | if (IS_ERR(fs_root)) { | |
76dda93c YZ |
4354 | ret = PTR_ERR(fs_root); |
4355 | if (ret != -ENOENT) { | |
4356 | err = ret; | |
4357 | goto out; | |
4358 | } | |
79787eaa JM |
4359 | ret = mark_garbage_root(reloc_root); |
4360 | if (ret < 0) { | |
4361 | err = ret; | |
4362 | goto out; | |
4363 | } | |
5d4f98a2 YZ |
4364 | } |
4365 | } | |
4366 | ||
4367 | if (key.offset == 0) | |
4368 | break; | |
4369 | ||
4370 | key.offset--; | |
4371 | } | |
b3b4aa74 | 4372 | btrfs_release_path(path); |
5d4f98a2 YZ |
4373 | |
4374 | if (list_empty(&reloc_roots)) | |
4375 | goto out; | |
4376 | ||
a9995eec | 4377 | rc = alloc_reloc_control(root->fs_info); |
5d4f98a2 YZ |
4378 | if (!rc) { |
4379 | err = -ENOMEM; | |
4380 | goto out; | |
4381 | } | |
4382 | ||
5d4f98a2 YZ |
4383 | rc->extent_root = root->fs_info->extent_root; |
4384 | ||
4385 | set_reloc_control(rc); | |
4386 | ||
7a7eaa40 | 4387 | trans = btrfs_join_transaction(rc->extent_root); |
3612b495 TI |
4388 | if (IS_ERR(trans)) { |
4389 | unset_reloc_control(rc); | |
4390 | err = PTR_ERR(trans); | |
4391 | goto out_free; | |
4392 | } | |
3fd0a558 YZ |
4393 | |
4394 | rc->merge_reloc_tree = 1; | |
4395 | ||
5d4f98a2 YZ |
4396 | while (!list_empty(&reloc_roots)) { |
4397 | reloc_root = list_entry(reloc_roots.next, | |
4398 | struct btrfs_root, root_list); | |
4399 | list_del(&reloc_root->root_list); | |
4400 | ||
4401 | if (btrfs_root_refs(&reloc_root->root_item) == 0) { | |
4402 | list_add_tail(&reloc_root->root_list, | |
4403 | &rc->reloc_roots); | |
4404 | continue; | |
4405 | } | |
4406 | ||
4407 | fs_root = read_fs_root(root->fs_info, | |
4408 | reloc_root->root_key.offset); | |
79787eaa JM |
4409 | if (IS_ERR(fs_root)) { |
4410 | err = PTR_ERR(fs_root); | |
4411 | goto out_free; | |
4412 | } | |
5d4f98a2 | 4413 | |
ffd7b339 | 4414 | err = __add_reloc_root(reloc_root); |
79787eaa | 4415 | BUG_ON(err < 0); /* -ENOMEM or logic error */ |
5d4f98a2 YZ |
4416 | fs_root->reloc_root = reloc_root; |
4417 | } | |
4418 | ||
79787eaa JM |
4419 | err = btrfs_commit_transaction(trans, rc->extent_root); |
4420 | if (err) | |
4421 | goto out_free; | |
5d4f98a2 YZ |
4422 | |
4423 | merge_reloc_roots(rc); | |
4424 | ||
4425 | unset_reloc_control(rc); | |
4426 | ||
7a7eaa40 | 4427 | trans = btrfs_join_transaction(rc->extent_root); |
3612b495 TI |
4428 | if (IS_ERR(trans)) |
4429 | err = PTR_ERR(trans); | |
4430 | else | |
79787eaa | 4431 | err = btrfs_commit_transaction(trans, rc->extent_root); |
3612b495 | 4432 | out_free: |
3fd0a558 | 4433 | kfree(rc); |
3612b495 | 4434 | out: |
aca1bba6 LB |
4435 | if (!list_empty(&reloc_roots)) |
4436 | free_reloc_roots(&reloc_roots); | |
4437 | ||
5d4f98a2 YZ |
4438 | btrfs_free_path(path); |
4439 | ||
4440 | if (err == 0) { | |
4441 | /* cleanup orphan inode in data relocation tree */ | |
4442 | fs_root = read_fs_root(root->fs_info, | |
4443 | BTRFS_DATA_RELOC_TREE_OBJECTID); | |
4444 | if (IS_ERR(fs_root)) | |
4445 | err = PTR_ERR(fs_root); | |
d7ce5843 | 4446 | else |
66b4ffd1 | 4447 | err = btrfs_orphan_cleanup(fs_root); |
5d4f98a2 YZ |
4448 | } |
4449 | return err; | |
4450 | } | |
4451 | ||
4452 | /* | |
4453 | * helper to add ordered checksum for data relocation. | |
4454 | * | |
4455 | * cloning checksum properly handles the nodatasum extents. | |
4456 | * it also saves CPU time to re-calculate the checksum. | |
4457 | */ | |
4458 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) | |
4459 | { | |
4460 | struct btrfs_ordered_sum *sums; | |
5d4f98a2 YZ |
4461 | struct btrfs_ordered_extent *ordered; |
4462 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5d4f98a2 YZ |
4463 | int ret; |
4464 | u64 disk_bytenr; | |
4465 | LIST_HEAD(list); | |
4466 | ||
4467 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); | |
4468 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); | |
4469 | ||
4470 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; | |
4471 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, | |
a2de733c | 4472 | disk_bytenr + len - 1, &list, 0); |
79787eaa JM |
4473 | if (ret) |
4474 | goto out; | |
5d4f98a2 | 4475 | |
f51a4a18 | 4476 | disk_bytenr = ordered->start; |
5d4f98a2 YZ |
4477 | while (!list_empty(&list)) { |
4478 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
4479 | list_del_init(&sums->list); | |
4480 | ||
f51a4a18 MX |
4481 | sums->bytenr = disk_bytenr; |
4482 | disk_bytenr += sums->len; | |
5d4f98a2 YZ |
4483 | |
4484 | btrfs_add_ordered_sum(inode, ordered, sums); | |
4485 | } | |
79787eaa | 4486 | out: |
5d4f98a2 | 4487 | btrfs_put_ordered_extent(ordered); |
411fc6bc | 4488 | return ret; |
5d4f98a2 | 4489 | } |
3fd0a558 YZ |
4490 | |
4491 | void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, | |
4492 | struct btrfs_root *root, struct extent_buffer *buf, | |
4493 | struct extent_buffer *cow) | |
4494 | { | |
4495 | struct reloc_control *rc; | |
4496 | struct backref_node *node; | |
4497 | int first_cow = 0; | |
4498 | int level; | |
4499 | int ret; | |
4500 | ||
4501 | rc = root->fs_info->reloc_ctl; | |
4502 | if (!rc) | |
4503 | return; | |
4504 | ||
4505 | BUG_ON(rc->stage == UPDATE_DATA_PTRS && | |
4506 | root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID); | |
4507 | ||
4508 | level = btrfs_header_level(buf); | |
4509 | if (btrfs_header_generation(buf) <= | |
4510 | btrfs_root_last_snapshot(&root->root_item)) | |
4511 | first_cow = 1; | |
4512 | ||
4513 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && | |
4514 | rc->create_reloc_tree) { | |
4515 | WARN_ON(!first_cow && level == 0); | |
4516 | ||
4517 | node = rc->backref_cache.path[level]; | |
4518 | BUG_ON(node->bytenr != buf->start && | |
4519 | node->new_bytenr != buf->start); | |
4520 | ||
4521 | drop_node_buffer(node); | |
4522 | extent_buffer_get(cow); | |
4523 | node->eb = cow; | |
4524 | node->new_bytenr = cow->start; | |
4525 | ||
4526 | if (!node->pending) { | |
4527 | list_move_tail(&node->list, | |
4528 | &rc->backref_cache.pending[level]); | |
4529 | node->pending = 1; | |
4530 | } | |
4531 | ||
4532 | if (first_cow) | |
4533 | __mark_block_processed(rc, node); | |
4534 | ||
4535 | if (first_cow && level > 0) | |
4536 | rc->nodes_relocated += buf->len; | |
4537 | } | |
4538 | ||
4539 | if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS) { | |
4540 | ret = replace_file_extents(trans, rc, root, cow); | |
4541 | BUG_ON(ret); | |
4542 | } | |
4543 | } | |
4544 | ||
4545 | /* | |
4546 | * called before creating snapshot. it calculates metadata reservation | |
4547 | * requried for relocating tree blocks in the snapshot | |
4548 | */ | |
4549 | void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans, | |
4550 | struct btrfs_pending_snapshot *pending, | |
4551 | u64 *bytes_to_reserve) | |
4552 | { | |
4553 | struct btrfs_root *root; | |
4554 | struct reloc_control *rc; | |
4555 | ||
4556 | root = pending->root; | |
4557 | if (!root->reloc_root) | |
4558 | return; | |
4559 | ||
4560 | rc = root->fs_info->reloc_ctl; | |
4561 | if (!rc->merge_reloc_tree) | |
4562 | return; | |
4563 | ||
4564 | root = root->reloc_root; | |
4565 | BUG_ON(btrfs_root_refs(&root->root_item) == 0); | |
4566 | /* | |
4567 | * relocation is in the stage of merging trees. the space | |
4568 | * used by merging a reloc tree is twice the size of | |
4569 | * relocated tree nodes in the worst case. half for cowing | |
4570 | * the reloc tree, half for cowing the fs tree. the space | |
4571 | * used by cowing the reloc tree will be freed after the | |
4572 | * tree is dropped. if we create snapshot, cowing the fs | |
4573 | * tree may use more space than it frees. so we need | |
4574 | * reserve extra space. | |
4575 | */ | |
4576 | *bytes_to_reserve += rc->nodes_relocated; | |
4577 | } | |
4578 | ||
4579 | /* | |
4580 | * called after snapshot is created. migrate block reservation | |
4581 | * and create reloc root for the newly created snapshot | |
4582 | */ | |
49b25e05 | 4583 | int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, |
3fd0a558 YZ |
4584 | struct btrfs_pending_snapshot *pending) |
4585 | { | |
4586 | struct btrfs_root *root = pending->root; | |
4587 | struct btrfs_root *reloc_root; | |
4588 | struct btrfs_root *new_root; | |
4589 | struct reloc_control *rc; | |
4590 | int ret; | |
4591 | ||
4592 | if (!root->reloc_root) | |
49b25e05 | 4593 | return 0; |
3fd0a558 YZ |
4594 | |
4595 | rc = root->fs_info->reloc_ctl; | |
4596 | rc->merging_rsv_size += rc->nodes_relocated; | |
4597 | ||
4598 | if (rc->merge_reloc_tree) { | |
4599 | ret = btrfs_block_rsv_migrate(&pending->block_rsv, | |
4600 | rc->block_rsv, | |
4601 | rc->nodes_relocated); | |
49b25e05 JM |
4602 | if (ret) |
4603 | return ret; | |
3fd0a558 YZ |
4604 | } |
4605 | ||
4606 | new_root = pending->snap; | |
4607 | reloc_root = create_reloc_root(trans, root->reloc_root, | |
4608 | new_root->root_key.objectid); | |
49b25e05 JM |
4609 | if (IS_ERR(reloc_root)) |
4610 | return PTR_ERR(reloc_root); | |
3fd0a558 | 4611 | |
ffd7b339 JM |
4612 | ret = __add_reloc_root(reloc_root); |
4613 | BUG_ON(ret < 0); | |
3fd0a558 YZ |
4614 | new_root->reloc_root = reloc_root; |
4615 | ||
49b25e05 | 4616 | if (rc->create_reloc_tree) |
3fd0a558 | 4617 | ret = clone_backref_node(trans, rc, root, reloc_root); |
49b25e05 | 4618 | return ret; |
3fd0a558 | 4619 | } |