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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5d4f98a2 YZ |
2 | /* |
3 | * Copyright (C) 2009 Oracle. All rights reserved. | |
5d4f98a2 YZ |
4 | */ |
5 | ||
6 | #include <linux/sched.h> | |
7 | #include <linux/pagemap.h> | |
8 | #include <linux/writeback.h> | |
9 | #include <linux/blkdev.h> | |
10 | #include <linux/rbtree.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
5d4f98a2 YZ |
12 | #include "ctree.h" |
13 | #include "disk-io.h" | |
14 | #include "transaction.h" | |
15 | #include "volumes.h" | |
16 | #include "locking.h" | |
17 | #include "btrfs_inode.h" | |
18 | #include "async-thread.h" | |
0af3d00b | 19 | #include "free-space-cache.h" |
581bb050 | 20 | #include "inode-map.h" |
62b99540 | 21 | #include "qgroup.h" |
cdccee99 | 22 | #include "print-tree.h" |
5d4f98a2 YZ |
23 | |
24 | /* | |
25 | * backref_node, mapping_node and tree_block start with this | |
26 | */ | |
27 | struct tree_entry { | |
28 | struct rb_node rb_node; | |
29 | u64 bytenr; | |
30 | }; | |
31 | ||
32 | /* | |
33 | * present a tree block in the backref cache | |
34 | */ | |
35 | struct backref_node { | |
36 | struct rb_node rb_node; | |
37 | u64 bytenr; | |
3fd0a558 YZ |
38 | |
39 | u64 new_bytenr; | |
40 | /* objectid of tree block owner, can be not uptodate */ | |
5d4f98a2 | 41 | u64 owner; |
3fd0a558 YZ |
42 | /* link to pending, changed or detached list */ |
43 | struct list_head list; | |
5d4f98a2 YZ |
44 | /* list of upper level blocks reference this block */ |
45 | struct list_head upper; | |
46 | /* list of child blocks in the cache */ | |
47 | struct list_head lower; | |
48 | /* NULL if this node is not tree root */ | |
49 | struct btrfs_root *root; | |
50 | /* extent buffer got by COW the block */ | |
51 | struct extent_buffer *eb; | |
52 | /* level of tree block */ | |
53 | unsigned int level:8; | |
3fd0a558 YZ |
54 | /* is the block in non-reference counted tree */ |
55 | unsigned int cowonly:1; | |
56 | /* 1 if no child node in the cache */ | |
5d4f98a2 YZ |
57 | unsigned int lowest:1; |
58 | /* is the extent buffer locked */ | |
59 | unsigned int locked:1; | |
60 | /* has the block been processed */ | |
61 | unsigned int processed:1; | |
62 | /* have backrefs of this block been checked */ | |
63 | unsigned int checked:1; | |
3fd0a558 YZ |
64 | /* |
65 | * 1 if corresponding block has been cowed but some upper | |
66 | * level block pointers may not point to the new location | |
67 | */ | |
68 | unsigned int pending:1; | |
69 | /* | |
70 | * 1 if the backref node isn't connected to any other | |
71 | * backref node. | |
72 | */ | |
73 | unsigned int detached:1; | |
5d4f98a2 YZ |
74 | }; |
75 | ||
76 | /* | |
77 | * present a block pointer in the backref cache | |
78 | */ | |
79 | struct backref_edge { | |
80 | struct list_head list[2]; | |
81 | struct backref_node *node[2]; | |
5d4f98a2 YZ |
82 | }; |
83 | ||
84 | #define LOWER 0 | |
85 | #define UPPER 1 | |
0647bf56 | 86 | #define RELOCATION_RESERVED_NODES 256 |
5d4f98a2 YZ |
87 | |
88 | struct backref_cache { | |
89 | /* red black tree of all backref nodes in the cache */ | |
90 | struct rb_root rb_root; | |
3fd0a558 YZ |
91 | /* for passing backref nodes to btrfs_reloc_cow_block */ |
92 | struct backref_node *path[BTRFS_MAX_LEVEL]; | |
93 | /* | |
94 | * list of blocks that have been cowed but some block | |
95 | * pointers in upper level blocks may not reflect the | |
96 | * new location | |
97 | */ | |
5d4f98a2 | 98 | struct list_head pending[BTRFS_MAX_LEVEL]; |
3fd0a558 YZ |
99 | /* list of backref nodes with no child node */ |
100 | struct list_head leaves; | |
101 | /* list of blocks that have been cowed in current transaction */ | |
102 | struct list_head changed; | |
103 | /* list of detached backref node. */ | |
104 | struct list_head detached; | |
105 | ||
106 | u64 last_trans; | |
107 | ||
108 | int nr_nodes; | |
109 | int nr_edges; | |
5d4f98a2 YZ |
110 | }; |
111 | ||
112 | /* | |
113 | * map address of tree root to tree | |
114 | */ | |
115 | struct mapping_node { | |
116 | struct rb_node rb_node; | |
117 | u64 bytenr; | |
118 | void *data; | |
119 | }; | |
120 | ||
121 | struct mapping_tree { | |
122 | struct rb_root rb_root; | |
123 | spinlock_t lock; | |
124 | }; | |
125 | ||
126 | /* | |
127 | * present a tree block to process | |
128 | */ | |
129 | struct tree_block { | |
130 | struct rb_node rb_node; | |
131 | u64 bytenr; | |
132 | struct btrfs_key key; | |
133 | unsigned int level:8; | |
134 | unsigned int key_ready:1; | |
135 | }; | |
136 | ||
0257bb82 YZ |
137 | #define MAX_EXTENTS 128 |
138 | ||
139 | struct file_extent_cluster { | |
140 | u64 start; | |
141 | u64 end; | |
142 | u64 boundary[MAX_EXTENTS]; | |
143 | unsigned int nr; | |
144 | }; | |
145 | ||
5d4f98a2 YZ |
146 | struct reloc_control { |
147 | /* block group to relocate */ | |
148 | struct btrfs_block_group_cache *block_group; | |
149 | /* extent tree */ | |
150 | struct btrfs_root *extent_root; | |
151 | /* inode for moving data */ | |
152 | struct inode *data_inode; | |
3fd0a558 YZ |
153 | |
154 | struct btrfs_block_rsv *block_rsv; | |
155 | ||
156 | struct backref_cache backref_cache; | |
157 | ||
158 | struct file_extent_cluster cluster; | |
5d4f98a2 YZ |
159 | /* tree blocks have been processed */ |
160 | struct extent_io_tree processed_blocks; | |
161 | /* map start of tree root to corresponding reloc tree */ | |
162 | struct mapping_tree reloc_root_tree; | |
163 | /* list of reloc trees */ | |
164 | struct list_head reloc_roots; | |
3fd0a558 YZ |
165 | /* size of metadata reservation for merging reloc trees */ |
166 | u64 merging_rsv_size; | |
167 | /* size of relocated tree nodes */ | |
168 | u64 nodes_relocated; | |
0647bf56 WS |
169 | /* reserved size for block group relocation*/ |
170 | u64 reserved_bytes; | |
3fd0a558 | 171 | |
5d4f98a2 YZ |
172 | u64 search_start; |
173 | u64 extents_found; | |
3fd0a558 | 174 | |
3fd0a558 YZ |
175 | unsigned int stage:8; |
176 | unsigned int create_reloc_tree:1; | |
177 | unsigned int merge_reloc_tree:1; | |
5d4f98a2 | 178 | unsigned int found_file_extent:1; |
5d4f98a2 YZ |
179 | }; |
180 | ||
181 | /* stages of data relocation */ | |
182 | #define MOVE_DATA_EXTENTS 0 | |
183 | #define UPDATE_DATA_PTRS 1 | |
184 | ||
3fd0a558 YZ |
185 | static void remove_backref_node(struct backref_cache *cache, |
186 | struct backref_node *node); | |
187 | static void __mark_block_processed(struct reloc_control *rc, | |
188 | struct backref_node *node); | |
5d4f98a2 YZ |
189 | |
190 | static void mapping_tree_init(struct mapping_tree *tree) | |
191 | { | |
6bef4d31 | 192 | tree->rb_root = RB_ROOT; |
5d4f98a2 YZ |
193 | spin_lock_init(&tree->lock); |
194 | } | |
195 | ||
196 | static void backref_cache_init(struct backref_cache *cache) | |
197 | { | |
198 | int i; | |
6bef4d31 | 199 | cache->rb_root = RB_ROOT; |
5d4f98a2 YZ |
200 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) |
201 | INIT_LIST_HEAD(&cache->pending[i]); | |
3fd0a558 YZ |
202 | INIT_LIST_HEAD(&cache->changed); |
203 | INIT_LIST_HEAD(&cache->detached); | |
204 | INIT_LIST_HEAD(&cache->leaves); | |
205 | } | |
206 | ||
207 | static void backref_cache_cleanup(struct backref_cache *cache) | |
208 | { | |
209 | struct backref_node *node; | |
210 | int i; | |
211 | ||
212 | while (!list_empty(&cache->detached)) { | |
213 | node = list_entry(cache->detached.next, | |
214 | struct backref_node, list); | |
215 | remove_backref_node(cache, node); | |
216 | } | |
217 | ||
218 | while (!list_empty(&cache->leaves)) { | |
219 | node = list_entry(cache->leaves.next, | |
220 | struct backref_node, lower); | |
221 | remove_backref_node(cache, node); | |
222 | } | |
223 | ||
224 | cache->last_trans = 0; | |
225 | ||
226 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) | |
f4907095 LB |
227 | ASSERT(list_empty(&cache->pending[i])); |
228 | ASSERT(list_empty(&cache->changed)); | |
229 | ASSERT(list_empty(&cache->detached)); | |
230 | ASSERT(RB_EMPTY_ROOT(&cache->rb_root)); | |
231 | ASSERT(!cache->nr_nodes); | |
232 | ASSERT(!cache->nr_edges); | |
3fd0a558 YZ |
233 | } |
234 | ||
235 | static struct backref_node *alloc_backref_node(struct backref_cache *cache) | |
236 | { | |
237 | struct backref_node *node; | |
238 | ||
239 | node = kzalloc(sizeof(*node), GFP_NOFS); | |
240 | if (node) { | |
241 | INIT_LIST_HEAD(&node->list); | |
242 | INIT_LIST_HEAD(&node->upper); | |
243 | INIT_LIST_HEAD(&node->lower); | |
244 | RB_CLEAR_NODE(&node->rb_node); | |
245 | cache->nr_nodes++; | |
246 | } | |
247 | return node; | |
248 | } | |
249 | ||
250 | static void free_backref_node(struct backref_cache *cache, | |
251 | struct backref_node *node) | |
252 | { | |
253 | if (node) { | |
254 | cache->nr_nodes--; | |
255 | kfree(node); | |
256 | } | |
257 | } | |
258 | ||
259 | static struct backref_edge *alloc_backref_edge(struct backref_cache *cache) | |
260 | { | |
261 | struct backref_edge *edge; | |
262 | ||
263 | edge = kzalloc(sizeof(*edge), GFP_NOFS); | |
264 | if (edge) | |
265 | cache->nr_edges++; | |
266 | return edge; | |
5d4f98a2 YZ |
267 | } |
268 | ||
3fd0a558 YZ |
269 | static void free_backref_edge(struct backref_cache *cache, |
270 | struct backref_edge *edge) | |
5d4f98a2 | 271 | { |
3fd0a558 YZ |
272 | if (edge) { |
273 | cache->nr_edges--; | |
274 | kfree(edge); | |
275 | } | |
5d4f98a2 YZ |
276 | } |
277 | ||
278 | static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr, | |
279 | struct rb_node *node) | |
280 | { | |
281 | struct rb_node **p = &root->rb_node; | |
282 | struct rb_node *parent = NULL; | |
283 | struct tree_entry *entry; | |
284 | ||
285 | while (*p) { | |
286 | parent = *p; | |
287 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
288 | ||
289 | if (bytenr < entry->bytenr) | |
290 | p = &(*p)->rb_left; | |
291 | else if (bytenr > entry->bytenr) | |
292 | p = &(*p)->rb_right; | |
293 | else | |
294 | return parent; | |
295 | } | |
296 | ||
297 | rb_link_node(node, parent, p); | |
298 | rb_insert_color(node, root); | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | static struct rb_node *tree_search(struct rb_root *root, u64 bytenr) | |
303 | { | |
304 | struct rb_node *n = root->rb_node; | |
305 | struct tree_entry *entry; | |
306 | ||
307 | while (n) { | |
308 | entry = rb_entry(n, struct tree_entry, rb_node); | |
309 | ||
310 | if (bytenr < entry->bytenr) | |
311 | n = n->rb_left; | |
312 | else if (bytenr > entry->bytenr) | |
313 | n = n->rb_right; | |
314 | else | |
315 | return n; | |
316 | } | |
317 | return NULL; | |
318 | } | |
319 | ||
48a3b636 | 320 | static void backref_tree_panic(struct rb_node *rb_node, int errno, u64 bytenr) |
43c04fb1 JM |
321 | { |
322 | ||
323 | struct btrfs_fs_info *fs_info = NULL; | |
324 | struct backref_node *bnode = rb_entry(rb_node, struct backref_node, | |
325 | rb_node); | |
326 | if (bnode->root) | |
327 | fs_info = bnode->root->fs_info; | |
5d163e0e JM |
328 | btrfs_panic(fs_info, errno, |
329 | "Inconsistency in backref cache found at offset %llu", | |
330 | bytenr); | |
43c04fb1 JM |
331 | } |
332 | ||
5d4f98a2 YZ |
333 | /* |
334 | * walk up backref nodes until reach node presents tree root | |
335 | */ | |
336 | static struct backref_node *walk_up_backref(struct backref_node *node, | |
337 | struct backref_edge *edges[], | |
338 | int *index) | |
339 | { | |
340 | struct backref_edge *edge; | |
341 | int idx = *index; | |
342 | ||
343 | while (!list_empty(&node->upper)) { | |
344 | edge = list_entry(node->upper.next, | |
345 | struct backref_edge, list[LOWER]); | |
346 | edges[idx++] = edge; | |
347 | node = edge->node[UPPER]; | |
348 | } | |
3fd0a558 | 349 | BUG_ON(node->detached); |
5d4f98a2 YZ |
350 | *index = idx; |
351 | return node; | |
352 | } | |
353 | ||
354 | /* | |
355 | * walk down backref nodes to find start of next reference path | |
356 | */ | |
357 | static struct backref_node *walk_down_backref(struct backref_edge *edges[], | |
358 | int *index) | |
359 | { | |
360 | struct backref_edge *edge; | |
361 | struct backref_node *lower; | |
362 | int idx = *index; | |
363 | ||
364 | while (idx > 0) { | |
365 | edge = edges[idx - 1]; | |
366 | lower = edge->node[LOWER]; | |
367 | if (list_is_last(&edge->list[LOWER], &lower->upper)) { | |
368 | idx--; | |
369 | continue; | |
370 | } | |
371 | edge = list_entry(edge->list[LOWER].next, | |
372 | struct backref_edge, list[LOWER]); | |
373 | edges[idx - 1] = edge; | |
374 | *index = idx; | |
375 | return edge->node[UPPER]; | |
376 | } | |
377 | *index = 0; | |
378 | return NULL; | |
379 | } | |
380 | ||
3fd0a558 YZ |
381 | static void unlock_node_buffer(struct backref_node *node) |
382 | { | |
383 | if (node->locked) { | |
384 | btrfs_tree_unlock(node->eb); | |
385 | node->locked = 0; | |
386 | } | |
387 | } | |
388 | ||
5d4f98a2 YZ |
389 | static void drop_node_buffer(struct backref_node *node) |
390 | { | |
391 | if (node->eb) { | |
3fd0a558 | 392 | unlock_node_buffer(node); |
5d4f98a2 YZ |
393 | free_extent_buffer(node->eb); |
394 | node->eb = NULL; | |
395 | } | |
396 | } | |
397 | ||
398 | static void drop_backref_node(struct backref_cache *tree, | |
399 | struct backref_node *node) | |
400 | { | |
5d4f98a2 YZ |
401 | BUG_ON(!list_empty(&node->upper)); |
402 | ||
403 | drop_node_buffer(node); | |
3fd0a558 | 404 | list_del(&node->list); |
5d4f98a2 | 405 | list_del(&node->lower); |
3fd0a558 YZ |
406 | if (!RB_EMPTY_NODE(&node->rb_node)) |
407 | rb_erase(&node->rb_node, &tree->rb_root); | |
408 | free_backref_node(tree, node); | |
5d4f98a2 YZ |
409 | } |
410 | ||
411 | /* | |
412 | * remove a backref node from the backref cache | |
413 | */ | |
414 | static void remove_backref_node(struct backref_cache *cache, | |
415 | struct backref_node *node) | |
416 | { | |
417 | struct backref_node *upper; | |
418 | struct backref_edge *edge; | |
419 | ||
420 | if (!node) | |
421 | return; | |
422 | ||
3fd0a558 | 423 | BUG_ON(!node->lowest && !node->detached); |
5d4f98a2 YZ |
424 | while (!list_empty(&node->upper)) { |
425 | edge = list_entry(node->upper.next, struct backref_edge, | |
426 | list[LOWER]); | |
427 | upper = edge->node[UPPER]; | |
428 | list_del(&edge->list[LOWER]); | |
429 | list_del(&edge->list[UPPER]); | |
3fd0a558 YZ |
430 | free_backref_edge(cache, edge); |
431 | ||
432 | if (RB_EMPTY_NODE(&upper->rb_node)) { | |
433 | BUG_ON(!list_empty(&node->upper)); | |
434 | drop_backref_node(cache, node); | |
435 | node = upper; | |
436 | node->lowest = 1; | |
437 | continue; | |
438 | } | |
5d4f98a2 | 439 | /* |
3fd0a558 | 440 | * add the node to leaf node list if no other |
5d4f98a2 YZ |
441 | * child block cached. |
442 | */ | |
443 | if (list_empty(&upper->lower)) { | |
3fd0a558 | 444 | list_add_tail(&upper->lower, &cache->leaves); |
5d4f98a2 YZ |
445 | upper->lowest = 1; |
446 | } | |
447 | } | |
3fd0a558 | 448 | |
5d4f98a2 YZ |
449 | drop_backref_node(cache, node); |
450 | } | |
451 | ||
3fd0a558 YZ |
452 | static void update_backref_node(struct backref_cache *cache, |
453 | struct backref_node *node, u64 bytenr) | |
454 | { | |
455 | struct rb_node *rb_node; | |
456 | rb_erase(&node->rb_node, &cache->rb_root); | |
457 | node->bytenr = bytenr; | |
458 | rb_node = tree_insert(&cache->rb_root, node->bytenr, &node->rb_node); | |
43c04fb1 JM |
459 | if (rb_node) |
460 | backref_tree_panic(rb_node, -EEXIST, bytenr); | |
3fd0a558 YZ |
461 | } |
462 | ||
463 | /* | |
464 | * update backref cache after a transaction commit | |
465 | */ | |
466 | static int update_backref_cache(struct btrfs_trans_handle *trans, | |
467 | struct backref_cache *cache) | |
468 | { | |
469 | struct backref_node *node; | |
470 | int level = 0; | |
471 | ||
472 | if (cache->last_trans == 0) { | |
473 | cache->last_trans = trans->transid; | |
474 | return 0; | |
475 | } | |
476 | ||
477 | if (cache->last_trans == trans->transid) | |
478 | return 0; | |
479 | ||
480 | /* | |
481 | * detached nodes are used to avoid unnecessary backref | |
482 | * lookup. transaction commit changes the extent tree. | |
483 | * so the detached nodes are no longer useful. | |
484 | */ | |
485 | while (!list_empty(&cache->detached)) { | |
486 | node = list_entry(cache->detached.next, | |
487 | struct backref_node, list); | |
488 | remove_backref_node(cache, node); | |
489 | } | |
490 | ||
491 | while (!list_empty(&cache->changed)) { | |
492 | node = list_entry(cache->changed.next, | |
493 | struct backref_node, list); | |
494 | list_del_init(&node->list); | |
495 | BUG_ON(node->pending); | |
496 | update_backref_node(cache, node, node->new_bytenr); | |
497 | } | |
498 | ||
499 | /* | |
500 | * some nodes can be left in the pending list if there were | |
501 | * errors during processing the pending nodes. | |
502 | */ | |
503 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { | |
504 | list_for_each_entry(node, &cache->pending[level], list) { | |
505 | BUG_ON(!node->pending); | |
506 | if (node->bytenr == node->new_bytenr) | |
507 | continue; | |
508 | update_backref_node(cache, node, node->new_bytenr); | |
509 | } | |
510 | } | |
511 | ||
512 | cache->last_trans = 0; | |
513 | return 1; | |
514 | } | |
515 | ||
f2a97a9d | 516 | |
3fd0a558 YZ |
517 | static int should_ignore_root(struct btrfs_root *root) |
518 | { | |
519 | struct btrfs_root *reloc_root; | |
520 | ||
27cdeb70 | 521 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
3fd0a558 YZ |
522 | return 0; |
523 | ||
524 | reloc_root = root->reloc_root; | |
525 | if (!reloc_root) | |
526 | return 0; | |
527 | ||
528 | if (btrfs_root_last_snapshot(&reloc_root->root_item) == | |
529 | root->fs_info->running_transaction->transid - 1) | |
530 | return 0; | |
531 | /* | |
532 | * if there is reloc tree and it was created in previous | |
533 | * transaction backref lookup can find the reloc tree, | |
534 | * so backref node for the fs tree root is useless for | |
535 | * relocation. | |
536 | */ | |
537 | return 1; | |
538 | } | |
5d4f98a2 YZ |
539 | /* |
540 | * find reloc tree by address of tree root | |
541 | */ | |
542 | static struct btrfs_root *find_reloc_root(struct reloc_control *rc, | |
543 | u64 bytenr) | |
544 | { | |
545 | struct rb_node *rb_node; | |
546 | struct mapping_node *node; | |
547 | struct btrfs_root *root = NULL; | |
548 | ||
549 | spin_lock(&rc->reloc_root_tree.lock); | |
550 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, bytenr); | |
551 | if (rb_node) { | |
552 | node = rb_entry(rb_node, struct mapping_node, rb_node); | |
553 | root = (struct btrfs_root *)node->data; | |
554 | } | |
555 | spin_unlock(&rc->reloc_root_tree.lock); | |
556 | return root; | |
557 | } | |
558 | ||
559 | static int is_cowonly_root(u64 root_objectid) | |
560 | { | |
561 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || | |
562 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || | |
563 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || | |
564 | root_objectid == BTRFS_DEV_TREE_OBJECTID || | |
565 | root_objectid == BTRFS_TREE_LOG_OBJECTID || | |
66463748 WS |
566 | root_objectid == BTRFS_CSUM_TREE_OBJECTID || |
567 | root_objectid == BTRFS_UUID_TREE_OBJECTID || | |
3e4c5efb DS |
568 | root_objectid == BTRFS_QUOTA_TREE_OBJECTID || |
569 | root_objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) | |
5d4f98a2 YZ |
570 | return 1; |
571 | return 0; | |
572 | } | |
573 | ||
574 | static struct btrfs_root *read_fs_root(struct btrfs_fs_info *fs_info, | |
575 | u64 root_objectid) | |
576 | { | |
577 | struct btrfs_key key; | |
578 | ||
579 | key.objectid = root_objectid; | |
580 | key.type = BTRFS_ROOT_ITEM_KEY; | |
581 | if (is_cowonly_root(root_objectid)) | |
582 | key.offset = 0; | |
583 | else | |
584 | key.offset = (u64)-1; | |
585 | ||
c00869f1 | 586 | return btrfs_get_fs_root(fs_info, &key, false); |
5d4f98a2 YZ |
587 | } |
588 | ||
589 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
590 | static noinline_for_stack | |
591 | struct btrfs_root *find_tree_root(struct reloc_control *rc, | |
592 | struct extent_buffer *leaf, | |
593 | struct btrfs_extent_ref_v0 *ref0) | |
594 | { | |
595 | struct btrfs_root *root; | |
596 | u64 root_objectid = btrfs_ref_root_v0(leaf, ref0); | |
597 | u64 generation = btrfs_ref_generation_v0(leaf, ref0); | |
598 | ||
599 | BUG_ON(root_objectid == BTRFS_TREE_RELOC_OBJECTID); | |
600 | ||
601 | root = read_fs_root(rc->extent_root->fs_info, root_objectid); | |
602 | BUG_ON(IS_ERR(root)); | |
603 | ||
27cdeb70 | 604 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) && |
5d4f98a2 YZ |
605 | generation != btrfs_root_generation(&root->root_item)) |
606 | return NULL; | |
607 | ||
608 | return root; | |
609 | } | |
610 | #endif | |
611 | ||
612 | static noinline_for_stack | |
613 | int find_inline_backref(struct extent_buffer *leaf, int slot, | |
614 | unsigned long *ptr, unsigned long *end) | |
615 | { | |
3173a18f | 616 | struct btrfs_key key; |
5d4f98a2 YZ |
617 | struct btrfs_extent_item *ei; |
618 | struct btrfs_tree_block_info *bi; | |
619 | u32 item_size; | |
620 | ||
3173a18f JB |
621 | btrfs_item_key_to_cpu(leaf, &key, slot); |
622 | ||
5d4f98a2 YZ |
623 | item_size = btrfs_item_size_nr(leaf, slot); |
624 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
625 | if (item_size < sizeof(*ei)) { | |
626 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
627 | return 1; | |
628 | } | |
629 | #endif | |
630 | ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); | |
631 | WARN_ON(!(btrfs_extent_flags(leaf, ei) & | |
632 | BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
633 | ||
3173a18f JB |
634 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
635 | item_size <= sizeof(*ei) + sizeof(*bi)) { | |
5d4f98a2 YZ |
636 | WARN_ON(item_size < sizeof(*ei) + sizeof(*bi)); |
637 | return 1; | |
638 | } | |
d062d13c JB |
639 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
640 | item_size <= sizeof(*ei)) { | |
641 | WARN_ON(item_size < sizeof(*ei)); | |
642 | return 1; | |
643 | } | |
5d4f98a2 | 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 | |
01327610 NS |
661 | * to find upper level blocks that reference the block, and then check |
662 | * backrefs of these upper level blocks recursively. the recursion stop | |
5d4f98a2 YZ |
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; | |
b6c60c80 | 694 | bool need_check = true; |
5d4f98a2 YZ |
695 | |
696 | path1 = btrfs_alloc_path(); | |
697 | path2 = btrfs_alloc_path(); | |
698 | if (!path1 || !path2) { | |
699 | err = -ENOMEM; | |
700 | goto out; | |
701 | } | |
e4058b54 DS |
702 | path1->reada = READA_FORWARD; |
703 | path2->reada = READA_FORWARD; | |
5d4f98a2 | 704 | |
3fd0a558 | 705 | node = alloc_backref_node(cache); |
5d4f98a2 YZ |
706 | if (!node) { |
707 | err = -ENOMEM; | |
708 | goto out; | |
709 | } | |
710 | ||
5d4f98a2 | 711 | node->bytenr = bytenr; |
5d4f98a2 YZ |
712 | node->level = level; |
713 | node->lowest = 1; | |
714 | cur = node; | |
715 | again: | |
716 | end = 0; | |
717 | ptr = 0; | |
718 | key.objectid = cur->bytenr; | |
3173a18f | 719 | key.type = BTRFS_METADATA_ITEM_KEY; |
5d4f98a2 YZ |
720 | key.offset = (u64)-1; |
721 | ||
722 | path1->search_commit_root = 1; | |
723 | path1->skip_locking = 1; | |
724 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path1, | |
725 | 0, 0); | |
726 | if (ret < 0) { | |
727 | err = ret; | |
728 | goto out; | |
729 | } | |
75bfb9af JB |
730 | ASSERT(ret); |
731 | ASSERT(path1->slots[0]); | |
5d4f98a2 YZ |
732 | |
733 | path1->slots[0]--; | |
734 | ||
735 | WARN_ON(cur->checked); | |
736 | if (!list_empty(&cur->upper)) { | |
737 | /* | |
70f23fd6 | 738 | * the backref was added previously when processing |
5d4f98a2 YZ |
739 | * backref of type BTRFS_TREE_BLOCK_REF_KEY |
740 | */ | |
75bfb9af | 741 | ASSERT(list_is_singular(&cur->upper)); |
5d4f98a2 YZ |
742 | edge = list_entry(cur->upper.next, struct backref_edge, |
743 | list[LOWER]); | |
75bfb9af | 744 | ASSERT(list_empty(&edge->list[UPPER])); |
5d4f98a2 YZ |
745 | exist = edge->node[UPPER]; |
746 | /* | |
747 | * add the upper level block to pending list if we need | |
748 | * check its backrefs | |
749 | */ | |
750 | if (!exist->checked) | |
751 | list_add_tail(&edge->list[UPPER], &list); | |
752 | } else { | |
753 | exist = NULL; | |
754 | } | |
755 | ||
756 | while (1) { | |
757 | cond_resched(); | |
758 | eb = path1->nodes[0]; | |
759 | ||
760 | if (ptr >= end) { | |
761 | if (path1->slots[0] >= btrfs_header_nritems(eb)) { | |
762 | ret = btrfs_next_leaf(rc->extent_root, path1); | |
763 | if (ret < 0) { | |
764 | err = ret; | |
765 | goto out; | |
766 | } | |
767 | if (ret > 0) | |
768 | break; | |
769 | eb = path1->nodes[0]; | |
770 | } | |
771 | ||
772 | btrfs_item_key_to_cpu(eb, &key, path1->slots[0]); | |
773 | if (key.objectid != cur->bytenr) { | |
774 | WARN_ON(exist); | |
775 | break; | |
776 | } | |
777 | ||
3173a18f JB |
778 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
779 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
5d4f98a2 YZ |
780 | ret = find_inline_backref(eb, path1->slots[0], |
781 | &ptr, &end); | |
782 | if (ret) | |
783 | goto next; | |
784 | } | |
785 | } | |
786 | ||
787 | if (ptr < end) { | |
788 | /* update key for inline back ref */ | |
789 | struct btrfs_extent_inline_ref *iref; | |
3de28d57 | 790 | int type; |
5d4f98a2 | 791 | iref = (struct btrfs_extent_inline_ref *)ptr; |
3de28d57 LB |
792 | type = btrfs_get_extent_inline_ref_type(eb, iref, |
793 | BTRFS_REF_TYPE_BLOCK); | |
794 | if (type == BTRFS_REF_TYPE_INVALID) { | |
795 | err = -EINVAL; | |
796 | goto out; | |
797 | } | |
798 | key.type = type; | |
5d4f98a2 | 799 | key.offset = btrfs_extent_inline_ref_offset(eb, iref); |
3de28d57 | 800 | |
5d4f98a2 YZ |
801 | WARN_ON(key.type != BTRFS_TREE_BLOCK_REF_KEY && |
802 | key.type != BTRFS_SHARED_BLOCK_REF_KEY); | |
803 | } | |
804 | ||
805 | if (exist && | |
806 | ((key.type == BTRFS_TREE_BLOCK_REF_KEY && | |
807 | exist->owner == key.offset) || | |
808 | (key.type == BTRFS_SHARED_BLOCK_REF_KEY && | |
809 | exist->bytenr == key.offset))) { | |
810 | exist = NULL; | |
811 | goto next; | |
812 | } | |
813 | ||
814 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
815 | if (key.type == BTRFS_SHARED_BLOCK_REF_KEY || | |
816 | key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
3fd0a558 | 817 | if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
5d4f98a2 YZ |
818 | struct btrfs_extent_ref_v0 *ref0; |
819 | ref0 = btrfs_item_ptr(eb, path1->slots[0], | |
820 | struct btrfs_extent_ref_v0); | |
3fd0a558 | 821 | if (key.objectid == key.offset) { |
046f264f | 822 | root = find_tree_root(rc, eb, ref0); |
3fd0a558 YZ |
823 | if (root && !should_ignore_root(root)) |
824 | cur->root = root; | |
825 | else | |
826 | list_add(&cur->list, &useless); | |
827 | break; | |
828 | } | |
046f264f YZ |
829 | if (is_cowonly_root(btrfs_ref_root_v0(eb, |
830 | ref0))) | |
831 | cur->cowonly = 1; | |
5d4f98a2 YZ |
832 | } |
833 | #else | |
75bfb9af | 834 | ASSERT(key.type != BTRFS_EXTENT_REF_V0_KEY); |
5d4f98a2 YZ |
835 | if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { |
836 | #endif | |
837 | if (key.objectid == key.offset) { | |
838 | /* | |
839 | * only root blocks of reloc trees use | |
840 | * backref of this type. | |
841 | */ | |
842 | root = find_reloc_root(rc, cur->bytenr); | |
75bfb9af | 843 | ASSERT(root); |
5d4f98a2 YZ |
844 | cur->root = root; |
845 | break; | |
846 | } | |
847 | ||
3fd0a558 | 848 | edge = alloc_backref_edge(cache); |
5d4f98a2 YZ |
849 | if (!edge) { |
850 | err = -ENOMEM; | |
851 | goto out; | |
852 | } | |
853 | rb_node = tree_search(&cache->rb_root, key.offset); | |
854 | if (!rb_node) { | |
3fd0a558 | 855 | upper = alloc_backref_node(cache); |
5d4f98a2 | 856 | if (!upper) { |
3fd0a558 | 857 | free_backref_edge(cache, edge); |
5d4f98a2 YZ |
858 | err = -ENOMEM; |
859 | goto out; | |
860 | } | |
5d4f98a2 | 861 | upper->bytenr = key.offset; |
5d4f98a2 YZ |
862 | upper->level = cur->level + 1; |
863 | /* | |
864 | * backrefs for the upper level block isn't | |
865 | * cached, add the block to pending list | |
866 | */ | |
867 | list_add_tail(&edge->list[UPPER], &list); | |
868 | } else { | |
869 | upper = rb_entry(rb_node, struct backref_node, | |
870 | rb_node); | |
75bfb9af | 871 | ASSERT(upper->checked); |
5d4f98a2 YZ |
872 | INIT_LIST_HEAD(&edge->list[UPPER]); |
873 | } | |
3fd0a558 | 874 | list_add_tail(&edge->list[LOWER], &cur->upper); |
5d4f98a2 | 875 | edge->node[LOWER] = cur; |
3fd0a558 | 876 | edge->node[UPPER] = upper; |
5d4f98a2 YZ |
877 | |
878 | goto next; | |
879 | } else if (key.type != BTRFS_TREE_BLOCK_REF_KEY) { | |
880 | goto next; | |
881 | } | |
882 | ||
883 | /* key.type == BTRFS_TREE_BLOCK_REF_KEY */ | |
884 | root = read_fs_root(rc->extent_root->fs_info, key.offset); | |
885 | if (IS_ERR(root)) { | |
886 | err = PTR_ERR(root); | |
887 | goto out; | |
888 | } | |
889 | ||
27cdeb70 | 890 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
3fd0a558 YZ |
891 | cur->cowonly = 1; |
892 | ||
5d4f98a2 YZ |
893 | if (btrfs_root_level(&root->root_item) == cur->level) { |
894 | /* tree root */ | |
75bfb9af | 895 | ASSERT(btrfs_root_bytenr(&root->root_item) == |
5d4f98a2 | 896 | cur->bytenr); |
3fd0a558 YZ |
897 | if (should_ignore_root(root)) |
898 | list_add(&cur->list, &useless); | |
899 | else | |
900 | cur->root = root; | |
5d4f98a2 YZ |
901 | break; |
902 | } | |
903 | ||
904 | level = cur->level + 1; | |
905 | ||
906 | /* | |
907 | * searching the tree to find upper level blocks | |
908 | * reference the block. | |
909 | */ | |
910 | path2->search_commit_root = 1; | |
911 | path2->skip_locking = 1; | |
912 | path2->lowest_level = level; | |
913 | ret = btrfs_search_slot(NULL, root, node_key, path2, 0, 0); | |
914 | path2->lowest_level = 0; | |
915 | if (ret < 0) { | |
916 | err = ret; | |
917 | goto out; | |
918 | } | |
33c66f43 YZ |
919 | if (ret > 0 && path2->slots[level] > 0) |
920 | path2->slots[level]--; | |
5d4f98a2 YZ |
921 | |
922 | eb = path2->nodes[level]; | |
3561b9db LB |
923 | if (btrfs_node_blockptr(eb, path2->slots[level]) != |
924 | cur->bytenr) { | |
925 | btrfs_err(root->fs_info, | |
926 | "couldn't find block (%llu) (level %d) in tree (%llu) with key (%llu %u %llu)", | |
927 | cur->bytenr, level - 1, root->objectid, | |
928 | node_key->objectid, node_key->type, | |
929 | node_key->offset); | |
930 | err = -ENOENT; | |
931 | goto out; | |
932 | } | |
5d4f98a2 | 933 | lower = cur; |
b6c60c80 | 934 | need_check = true; |
5d4f98a2 YZ |
935 | for (; level < BTRFS_MAX_LEVEL; level++) { |
936 | if (!path2->nodes[level]) { | |
75bfb9af | 937 | ASSERT(btrfs_root_bytenr(&root->root_item) == |
5d4f98a2 | 938 | lower->bytenr); |
3fd0a558 YZ |
939 | if (should_ignore_root(root)) |
940 | list_add(&lower->list, &useless); | |
941 | else | |
942 | lower->root = root; | |
5d4f98a2 YZ |
943 | break; |
944 | } | |
945 | ||
3fd0a558 | 946 | edge = alloc_backref_edge(cache); |
5d4f98a2 YZ |
947 | if (!edge) { |
948 | err = -ENOMEM; | |
949 | goto out; | |
950 | } | |
951 | ||
952 | eb = path2->nodes[level]; | |
953 | rb_node = tree_search(&cache->rb_root, eb->start); | |
954 | if (!rb_node) { | |
3fd0a558 | 955 | upper = alloc_backref_node(cache); |
5d4f98a2 | 956 | if (!upper) { |
3fd0a558 | 957 | free_backref_edge(cache, edge); |
5d4f98a2 YZ |
958 | err = -ENOMEM; |
959 | goto out; | |
960 | } | |
5d4f98a2 YZ |
961 | upper->bytenr = eb->start; |
962 | upper->owner = btrfs_header_owner(eb); | |
963 | upper->level = lower->level + 1; | |
27cdeb70 MX |
964 | if (!test_bit(BTRFS_ROOT_REF_COWS, |
965 | &root->state)) | |
3fd0a558 | 966 | upper->cowonly = 1; |
5d4f98a2 YZ |
967 | |
968 | /* | |
969 | * if we know the block isn't shared | |
970 | * we can void checking its backrefs. | |
971 | */ | |
972 | if (btrfs_block_can_be_shared(root, eb)) | |
973 | upper->checked = 0; | |
974 | else | |
975 | upper->checked = 1; | |
976 | ||
977 | /* | |
978 | * add the block to pending list if we | |
b6c60c80 JB |
979 | * need check its backrefs, we only do this once |
980 | * while walking up a tree as we will catch | |
981 | * anything else later on. | |
5d4f98a2 | 982 | */ |
b6c60c80 JB |
983 | if (!upper->checked && need_check) { |
984 | need_check = false; | |
5d4f98a2 YZ |
985 | list_add_tail(&edge->list[UPPER], |
986 | &list); | |
bbe90514 JB |
987 | } else { |
988 | if (upper->checked) | |
989 | need_check = true; | |
5d4f98a2 | 990 | INIT_LIST_HEAD(&edge->list[UPPER]); |
bbe90514 | 991 | } |
5d4f98a2 YZ |
992 | } else { |
993 | upper = rb_entry(rb_node, struct backref_node, | |
994 | rb_node); | |
75bfb9af | 995 | ASSERT(upper->checked); |
5d4f98a2 | 996 | INIT_LIST_HEAD(&edge->list[UPPER]); |
3fd0a558 YZ |
997 | if (!upper->owner) |
998 | upper->owner = btrfs_header_owner(eb); | |
5d4f98a2 YZ |
999 | } |
1000 | list_add_tail(&edge->list[LOWER], &lower->upper); | |
5d4f98a2 | 1001 | edge->node[LOWER] = lower; |
3fd0a558 | 1002 | edge->node[UPPER] = upper; |
5d4f98a2 YZ |
1003 | |
1004 | if (rb_node) | |
1005 | break; | |
1006 | lower = upper; | |
1007 | upper = NULL; | |
1008 | } | |
b3b4aa74 | 1009 | btrfs_release_path(path2); |
5d4f98a2 YZ |
1010 | next: |
1011 | if (ptr < end) { | |
1012 | ptr += btrfs_extent_inline_ref_size(key.type); | |
1013 | if (ptr >= end) { | |
1014 | WARN_ON(ptr > end); | |
1015 | ptr = 0; | |
1016 | end = 0; | |
1017 | } | |
1018 | } | |
1019 | if (ptr >= end) | |
1020 | path1->slots[0]++; | |
1021 | } | |
b3b4aa74 | 1022 | btrfs_release_path(path1); |
5d4f98a2 YZ |
1023 | |
1024 | cur->checked = 1; | |
1025 | WARN_ON(exist); | |
1026 | ||
1027 | /* the pending list isn't empty, take the first block to process */ | |
1028 | if (!list_empty(&list)) { | |
1029 | edge = list_entry(list.next, struct backref_edge, list[UPPER]); | |
1030 | list_del_init(&edge->list[UPPER]); | |
1031 | cur = edge->node[UPPER]; | |
1032 | goto again; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * everything goes well, connect backref nodes and insert backref nodes | |
1037 | * into the cache. | |
1038 | */ | |
75bfb9af | 1039 | ASSERT(node->checked); |
3fd0a558 YZ |
1040 | cowonly = node->cowonly; |
1041 | if (!cowonly) { | |
1042 | rb_node = tree_insert(&cache->rb_root, node->bytenr, | |
1043 | &node->rb_node); | |
43c04fb1 JM |
1044 | if (rb_node) |
1045 | backref_tree_panic(rb_node, -EEXIST, node->bytenr); | |
3fd0a558 YZ |
1046 | list_add_tail(&node->lower, &cache->leaves); |
1047 | } | |
5d4f98a2 YZ |
1048 | |
1049 | list_for_each_entry(edge, &node->upper, list[LOWER]) | |
1050 | list_add_tail(&edge->list[UPPER], &list); | |
1051 | ||
1052 | while (!list_empty(&list)) { | |
1053 | edge = list_entry(list.next, struct backref_edge, list[UPPER]); | |
1054 | list_del_init(&edge->list[UPPER]); | |
1055 | upper = edge->node[UPPER]; | |
3fd0a558 YZ |
1056 | if (upper->detached) { |
1057 | list_del(&edge->list[LOWER]); | |
1058 | lower = edge->node[LOWER]; | |
1059 | free_backref_edge(cache, edge); | |
1060 | if (list_empty(&lower->upper)) | |
1061 | list_add(&lower->list, &useless); | |
1062 | continue; | |
1063 | } | |
5d4f98a2 YZ |
1064 | |
1065 | if (!RB_EMPTY_NODE(&upper->rb_node)) { | |
1066 | if (upper->lowest) { | |
1067 | list_del_init(&upper->lower); | |
1068 | upper->lowest = 0; | |
1069 | } | |
1070 | ||
1071 | list_add_tail(&edge->list[UPPER], &upper->lower); | |
1072 | continue; | |
1073 | } | |
1074 | ||
75bfb9af JB |
1075 | if (!upper->checked) { |
1076 | /* | |
1077 | * Still want to blow up for developers since this is a | |
1078 | * logic bug. | |
1079 | */ | |
1080 | ASSERT(0); | |
1081 | err = -EINVAL; | |
1082 | goto out; | |
1083 | } | |
1084 | if (cowonly != upper->cowonly) { | |
1085 | ASSERT(0); | |
1086 | err = -EINVAL; | |
1087 | goto out; | |
1088 | } | |
1089 | ||
3fd0a558 YZ |
1090 | if (!cowonly) { |
1091 | rb_node = tree_insert(&cache->rb_root, upper->bytenr, | |
1092 | &upper->rb_node); | |
43c04fb1 JM |
1093 | if (rb_node) |
1094 | backref_tree_panic(rb_node, -EEXIST, | |
1095 | upper->bytenr); | |
3fd0a558 | 1096 | } |
5d4f98a2 YZ |
1097 | |
1098 | list_add_tail(&edge->list[UPPER], &upper->lower); | |
1099 | ||
1100 | list_for_each_entry(edge, &upper->upper, list[LOWER]) | |
1101 | list_add_tail(&edge->list[UPPER], &list); | |
1102 | } | |
3fd0a558 YZ |
1103 | /* |
1104 | * process useless backref nodes. backref nodes for tree leaves | |
1105 | * are deleted from the cache. backref nodes for upper level | |
1106 | * tree blocks are left in the cache to avoid unnecessary backref | |
1107 | * lookup. | |
1108 | */ | |
1109 | while (!list_empty(&useless)) { | |
1110 | upper = list_entry(useless.next, struct backref_node, list); | |
1111 | list_del_init(&upper->list); | |
75bfb9af | 1112 | ASSERT(list_empty(&upper->upper)); |
3fd0a558 YZ |
1113 | if (upper == node) |
1114 | node = NULL; | |
1115 | if (upper->lowest) { | |
1116 | list_del_init(&upper->lower); | |
1117 | upper->lowest = 0; | |
1118 | } | |
1119 | while (!list_empty(&upper->lower)) { | |
1120 | edge = list_entry(upper->lower.next, | |
1121 | struct backref_edge, list[UPPER]); | |
1122 | list_del(&edge->list[UPPER]); | |
1123 | list_del(&edge->list[LOWER]); | |
1124 | lower = edge->node[LOWER]; | |
1125 | free_backref_edge(cache, edge); | |
1126 | ||
1127 | if (list_empty(&lower->upper)) | |
1128 | list_add(&lower->list, &useless); | |
1129 | } | |
1130 | __mark_block_processed(rc, upper); | |
1131 | if (upper->level > 0) { | |
1132 | list_add(&upper->list, &cache->detached); | |
1133 | upper->detached = 1; | |
1134 | } else { | |
1135 | rb_erase(&upper->rb_node, &cache->rb_root); | |
1136 | free_backref_node(cache, upper); | |
1137 | } | |
1138 | } | |
5d4f98a2 YZ |
1139 | out: |
1140 | btrfs_free_path(path1); | |
1141 | btrfs_free_path(path2); | |
1142 | if (err) { | |
3fd0a558 YZ |
1143 | while (!list_empty(&useless)) { |
1144 | lower = list_entry(useless.next, | |
75bfb9af JB |
1145 | struct backref_node, list); |
1146 | list_del_init(&lower->list); | |
3fd0a558 | 1147 | } |
75bfb9af JB |
1148 | while (!list_empty(&list)) { |
1149 | edge = list_first_entry(&list, struct backref_edge, | |
1150 | list[UPPER]); | |
1151 | list_del(&edge->list[UPPER]); | |
3fd0a558 | 1152 | list_del(&edge->list[LOWER]); |
75bfb9af | 1153 | lower = edge->node[LOWER]; |
5d4f98a2 | 1154 | upper = edge->node[UPPER]; |
3fd0a558 | 1155 | free_backref_edge(cache, edge); |
75bfb9af JB |
1156 | |
1157 | /* | |
1158 | * Lower is no longer linked to any upper backref nodes | |
1159 | * and isn't in the cache, we can free it ourselves. | |
1160 | */ | |
1161 | if (list_empty(&lower->upper) && | |
1162 | RB_EMPTY_NODE(&lower->rb_node)) | |
1163 | list_add(&lower->list, &useless); | |
1164 | ||
1165 | if (!RB_EMPTY_NODE(&upper->rb_node)) | |
1166 | continue; | |
1167 | ||
01327610 | 1168 | /* Add this guy's upper edges to the list to process */ |
75bfb9af JB |
1169 | list_for_each_entry(edge, &upper->upper, list[LOWER]) |
1170 | list_add_tail(&edge->list[UPPER], &list); | |
1171 | if (list_empty(&upper->upper)) | |
1172 | list_add(&upper->list, &useless); | |
1173 | } | |
1174 | ||
1175 | while (!list_empty(&useless)) { | |
1176 | lower = list_entry(useless.next, | |
1177 | struct backref_node, list); | |
1178 | list_del_init(&lower->list); | |
0fd8c3da LB |
1179 | if (lower == node) |
1180 | node = NULL; | |
75bfb9af | 1181 | free_backref_node(cache, lower); |
5d4f98a2 | 1182 | } |
0fd8c3da LB |
1183 | |
1184 | free_backref_node(cache, node); | |
5d4f98a2 YZ |
1185 | return ERR_PTR(err); |
1186 | } | |
75bfb9af | 1187 | ASSERT(!node || !node->detached); |
5d4f98a2 YZ |
1188 | return node; |
1189 | } | |
1190 | ||
3fd0a558 YZ |
1191 | /* |
1192 | * helper to add backref node for the newly created snapshot. | |
1193 | * the backref node is created by cloning backref node that | |
1194 | * corresponds to root of source tree | |
1195 | */ | |
1196 | static int clone_backref_node(struct btrfs_trans_handle *trans, | |
1197 | struct reloc_control *rc, | |
1198 | struct btrfs_root *src, | |
1199 | struct btrfs_root *dest) | |
1200 | { | |
1201 | struct btrfs_root *reloc_root = src->reloc_root; | |
1202 | struct backref_cache *cache = &rc->backref_cache; | |
1203 | struct backref_node *node = NULL; | |
1204 | struct backref_node *new_node; | |
1205 | struct backref_edge *edge; | |
1206 | struct backref_edge *new_edge; | |
1207 | struct rb_node *rb_node; | |
1208 | ||
1209 | if (cache->last_trans > 0) | |
1210 | update_backref_cache(trans, cache); | |
1211 | ||
1212 | rb_node = tree_search(&cache->rb_root, src->commit_root->start); | |
1213 | if (rb_node) { | |
1214 | node = rb_entry(rb_node, struct backref_node, rb_node); | |
1215 | if (node->detached) | |
1216 | node = NULL; | |
1217 | else | |
1218 | BUG_ON(node->new_bytenr != reloc_root->node->start); | |
1219 | } | |
1220 | ||
1221 | if (!node) { | |
1222 | rb_node = tree_search(&cache->rb_root, | |
1223 | reloc_root->commit_root->start); | |
1224 | if (rb_node) { | |
1225 | node = rb_entry(rb_node, struct backref_node, | |
1226 | rb_node); | |
1227 | BUG_ON(node->detached); | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | if (!node) | |
1232 | return 0; | |
1233 | ||
1234 | new_node = alloc_backref_node(cache); | |
1235 | if (!new_node) | |
1236 | return -ENOMEM; | |
1237 | ||
1238 | new_node->bytenr = dest->node->start; | |
1239 | new_node->level = node->level; | |
1240 | new_node->lowest = node->lowest; | |
6848ad64 | 1241 | new_node->checked = 1; |
3fd0a558 YZ |
1242 | new_node->root = dest; |
1243 | ||
1244 | if (!node->lowest) { | |
1245 | list_for_each_entry(edge, &node->lower, list[UPPER]) { | |
1246 | new_edge = alloc_backref_edge(cache); | |
1247 | if (!new_edge) | |
1248 | goto fail; | |
1249 | ||
1250 | new_edge->node[UPPER] = new_node; | |
1251 | new_edge->node[LOWER] = edge->node[LOWER]; | |
1252 | list_add_tail(&new_edge->list[UPPER], | |
1253 | &new_node->lower); | |
1254 | } | |
76b9e23d MX |
1255 | } else { |
1256 | list_add_tail(&new_node->lower, &cache->leaves); | |
3fd0a558 YZ |
1257 | } |
1258 | ||
1259 | rb_node = tree_insert(&cache->rb_root, new_node->bytenr, | |
1260 | &new_node->rb_node); | |
43c04fb1 JM |
1261 | if (rb_node) |
1262 | backref_tree_panic(rb_node, -EEXIST, new_node->bytenr); | |
3fd0a558 YZ |
1263 | |
1264 | if (!new_node->lowest) { | |
1265 | list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) { | |
1266 | list_add_tail(&new_edge->list[LOWER], | |
1267 | &new_edge->node[LOWER]->upper); | |
1268 | } | |
1269 | } | |
1270 | return 0; | |
1271 | fail: | |
1272 | while (!list_empty(&new_node->lower)) { | |
1273 | new_edge = list_entry(new_node->lower.next, | |
1274 | struct backref_edge, list[UPPER]); | |
1275 | list_del(&new_edge->list[UPPER]); | |
1276 | free_backref_edge(cache, new_edge); | |
1277 | } | |
1278 | free_backref_node(cache, new_node); | |
1279 | return -ENOMEM; | |
1280 | } | |
1281 | ||
5d4f98a2 YZ |
1282 | /* |
1283 | * helper to add 'address of tree root -> reloc tree' mapping | |
1284 | */ | |
ffd7b339 | 1285 | static int __must_check __add_reloc_root(struct btrfs_root *root) |
5d4f98a2 | 1286 | { |
0b246afa | 1287 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
1288 | struct rb_node *rb_node; |
1289 | struct mapping_node *node; | |
0b246afa | 1290 | struct reloc_control *rc = fs_info->reloc_ctl; |
5d4f98a2 YZ |
1291 | |
1292 | node = kmalloc(sizeof(*node), GFP_NOFS); | |
ffd7b339 JM |
1293 | if (!node) |
1294 | return -ENOMEM; | |
5d4f98a2 YZ |
1295 | |
1296 | node->bytenr = root->node->start; | |
1297 | node->data = root; | |
1298 | ||
1299 | spin_lock(&rc->reloc_root_tree.lock); | |
1300 | rb_node = tree_insert(&rc->reloc_root_tree.rb_root, | |
1301 | node->bytenr, &node->rb_node); | |
1302 | spin_unlock(&rc->reloc_root_tree.lock); | |
ffd7b339 | 1303 | if (rb_node) { |
0b246afa | 1304 | btrfs_panic(fs_info, -EEXIST, |
5d163e0e JM |
1305 | "Duplicate root found for start=%llu while inserting into relocation tree", |
1306 | node->bytenr); | |
ffd7b339 | 1307 | } |
5d4f98a2 YZ |
1308 | |
1309 | list_add_tail(&root->root_list, &rc->reloc_roots); | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | /* | |
c974c464 | 1314 | * helper to delete the 'address of tree root -> reloc tree' |
5d4f98a2 YZ |
1315 | * mapping |
1316 | */ | |
c974c464 | 1317 | static void __del_reloc_root(struct btrfs_root *root) |
5d4f98a2 | 1318 | { |
0b246afa | 1319 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
1320 | struct rb_node *rb_node; |
1321 | struct mapping_node *node = NULL; | |
0b246afa | 1322 | struct reloc_control *rc = fs_info->reloc_ctl; |
5d4f98a2 YZ |
1323 | |
1324 | spin_lock(&rc->reloc_root_tree.lock); | |
1325 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, | |
c974c464 | 1326 | root->node->start); |
5d4f98a2 YZ |
1327 | if (rb_node) { |
1328 | node = rb_entry(rb_node, struct mapping_node, rb_node); | |
1329 | rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); | |
1330 | } | |
1331 | spin_unlock(&rc->reloc_root_tree.lock); | |
1332 | ||
8f71f3e0 | 1333 | if (!node) |
c974c464 | 1334 | return; |
5d4f98a2 YZ |
1335 | BUG_ON((struct btrfs_root *)node->data != root); |
1336 | ||
0b246afa | 1337 | spin_lock(&fs_info->trans_lock); |
c974c464 | 1338 | list_del_init(&root->root_list); |
0b246afa | 1339 | spin_unlock(&fs_info->trans_lock); |
c974c464 WS |
1340 | kfree(node); |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * helper to update the 'address of tree root -> reloc tree' | |
1345 | * mapping | |
1346 | */ | |
1347 | static int __update_reloc_root(struct btrfs_root *root, u64 new_bytenr) | |
1348 | { | |
0b246afa | 1349 | struct btrfs_fs_info *fs_info = root->fs_info; |
c974c464 WS |
1350 | struct rb_node *rb_node; |
1351 | struct mapping_node *node = NULL; | |
0b246afa | 1352 | struct reloc_control *rc = fs_info->reloc_ctl; |
c974c464 WS |
1353 | |
1354 | spin_lock(&rc->reloc_root_tree.lock); | |
1355 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, | |
1356 | root->node->start); | |
1357 | if (rb_node) { | |
1358 | node = rb_entry(rb_node, struct mapping_node, rb_node); | |
1359 | rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); | |
5d4f98a2 | 1360 | } |
c974c464 WS |
1361 | spin_unlock(&rc->reloc_root_tree.lock); |
1362 | ||
1363 | if (!node) | |
1364 | return 0; | |
1365 | BUG_ON((struct btrfs_root *)node->data != root); | |
1366 | ||
1367 | spin_lock(&rc->reloc_root_tree.lock); | |
1368 | node->bytenr = new_bytenr; | |
1369 | rb_node = tree_insert(&rc->reloc_root_tree.rb_root, | |
1370 | node->bytenr, &node->rb_node); | |
1371 | spin_unlock(&rc->reloc_root_tree.lock); | |
1372 | if (rb_node) | |
1373 | backref_tree_panic(rb_node, -EEXIST, node->bytenr); | |
5d4f98a2 YZ |
1374 | return 0; |
1375 | } | |
1376 | ||
3fd0a558 YZ |
1377 | static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans, |
1378 | struct btrfs_root *root, u64 objectid) | |
5d4f98a2 | 1379 | { |
0b246afa | 1380 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
1381 | struct btrfs_root *reloc_root; |
1382 | struct extent_buffer *eb; | |
1383 | struct btrfs_root_item *root_item; | |
1384 | struct btrfs_key root_key; | |
1385 | int ret; | |
1386 | ||
5d4f98a2 YZ |
1387 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); |
1388 | BUG_ON(!root_item); | |
1389 | ||
1390 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
1391 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
3fd0a558 | 1392 | root_key.offset = objectid; |
5d4f98a2 | 1393 | |
3fd0a558 | 1394 | if (root->root_key.objectid == objectid) { |
054570a1 FM |
1395 | u64 commit_root_gen; |
1396 | ||
3fd0a558 YZ |
1397 | /* called by btrfs_init_reloc_root */ |
1398 | ret = btrfs_copy_root(trans, root, root->commit_root, &eb, | |
1399 | BTRFS_TREE_RELOC_OBJECTID); | |
1400 | BUG_ON(ret); | |
054570a1 FM |
1401 | /* |
1402 | * Set the last_snapshot field to the generation of the commit | |
1403 | * root - like this ctree.c:btrfs_block_can_be_shared() behaves | |
1404 | * correctly (returns true) when the relocation root is created | |
1405 | * either inside the critical section of a transaction commit | |
1406 | * (through transaction.c:qgroup_account_snapshot()) and when | |
1407 | * it's created before the transaction commit is started. | |
1408 | */ | |
1409 | commit_root_gen = btrfs_header_generation(root->commit_root); | |
1410 | btrfs_set_root_last_snapshot(&root->root_item, commit_root_gen); | |
3fd0a558 YZ |
1411 | } else { |
1412 | /* | |
1413 | * called by btrfs_reloc_post_snapshot_hook. | |
1414 | * the source tree is a reloc tree, all tree blocks | |
1415 | * modified after it was created have RELOC flag | |
1416 | * set in their headers. so it's OK to not update | |
1417 | * the 'last_snapshot'. | |
1418 | */ | |
1419 | ret = btrfs_copy_root(trans, root, root->node, &eb, | |
1420 | BTRFS_TREE_RELOC_OBJECTID); | |
1421 | BUG_ON(ret); | |
1422 | } | |
5d4f98a2 | 1423 | |
5d4f98a2 | 1424 | memcpy(root_item, &root->root_item, sizeof(*root_item)); |
5d4f98a2 YZ |
1425 | btrfs_set_root_bytenr(root_item, eb->start); |
1426 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); | |
1427 | btrfs_set_root_generation(root_item, trans->transid); | |
3fd0a558 YZ |
1428 | |
1429 | if (root->root_key.objectid == objectid) { | |
1430 | btrfs_set_root_refs(root_item, 0); | |
1431 | memset(&root_item->drop_progress, 0, | |
1432 | sizeof(struct btrfs_disk_key)); | |
1433 | root_item->drop_level = 0; | |
1434 | } | |
5d4f98a2 YZ |
1435 | |
1436 | btrfs_tree_unlock(eb); | |
1437 | free_extent_buffer(eb); | |
1438 | ||
0b246afa | 1439 | ret = btrfs_insert_root(trans, fs_info->tree_root, |
5d4f98a2 YZ |
1440 | &root_key, root_item); |
1441 | BUG_ON(ret); | |
1442 | kfree(root_item); | |
1443 | ||
0b246afa | 1444 | reloc_root = btrfs_read_fs_root(fs_info->tree_root, &root_key); |
5d4f98a2 YZ |
1445 | BUG_ON(IS_ERR(reloc_root)); |
1446 | reloc_root->last_trans = trans->transid; | |
3fd0a558 YZ |
1447 | return reloc_root; |
1448 | } | |
1449 | ||
1450 | /* | |
1451 | * create reloc tree for a given fs tree. reloc tree is just a | |
1452 | * snapshot of the fs tree with special root objectid. | |
1453 | */ | |
1454 | int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, | |
1455 | struct btrfs_root *root) | |
1456 | { | |
0b246afa | 1457 | struct btrfs_fs_info *fs_info = root->fs_info; |
3fd0a558 | 1458 | struct btrfs_root *reloc_root; |
0b246afa | 1459 | struct reloc_control *rc = fs_info->reloc_ctl; |
20dd2cbf | 1460 | struct btrfs_block_rsv *rsv; |
3fd0a558 | 1461 | int clear_rsv = 0; |
ffd7b339 | 1462 | int ret; |
3fd0a558 YZ |
1463 | |
1464 | if (root->reloc_root) { | |
1465 | reloc_root = root->reloc_root; | |
1466 | reloc_root->last_trans = trans->transid; | |
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | if (!rc || !rc->create_reloc_tree || | |
1471 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) | |
1472 | return 0; | |
1473 | ||
20dd2cbf MX |
1474 | if (!trans->reloc_reserved) { |
1475 | rsv = trans->block_rsv; | |
3fd0a558 YZ |
1476 | trans->block_rsv = rc->block_rsv; |
1477 | clear_rsv = 1; | |
1478 | } | |
1479 | reloc_root = create_reloc_root(trans, root, root->root_key.objectid); | |
1480 | if (clear_rsv) | |
20dd2cbf | 1481 | trans->block_rsv = rsv; |
5d4f98a2 | 1482 | |
ffd7b339 JM |
1483 | ret = __add_reloc_root(reloc_root); |
1484 | BUG_ON(ret < 0); | |
5d4f98a2 YZ |
1485 | root->reloc_root = reloc_root; |
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | /* | |
1490 | * update root item of reloc tree | |
1491 | */ | |
1492 | int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, | |
1493 | struct btrfs_root *root) | |
1494 | { | |
0b246afa | 1495 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
1496 | struct btrfs_root *reloc_root; |
1497 | struct btrfs_root_item *root_item; | |
5d4f98a2 YZ |
1498 | int ret; |
1499 | ||
1500 | if (!root->reloc_root) | |
7585717f | 1501 | goto out; |
5d4f98a2 YZ |
1502 | |
1503 | reloc_root = root->reloc_root; | |
1504 | root_item = &reloc_root->root_item; | |
1505 | ||
0b246afa | 1506 | if (fs_info->reloc_ctl->merge_reloc_tree && |
3fd0a558 | 1507 | btrfs_root_refs(root_item) == 0) { |
5d4f98a2 | 1508 | root->reloc_root = NULL; |
c974c464 | 1509 | __del_reloc_root(reloc_root); |
5d4f98a2 YZ |
1510 | } |
1511 | ||
5d4f98a2 YZ |
1512 | if (reloc_root->commit_root != reloc_root->node) { |
1513 | btrfs_set_root_node(root_item, reloc_root->node); | |
1514 | free_extent_buffer(reloc_root->commit_root); | |
1515 | reloc_root->commit_root = btrfs_root_node(reloc_root); | |
1516 | } | |
1517 | ||
0b246afa | 1518 | ret = btrfs_update_root(trans, fs_info->tree_root, |
5d4f98a2 YZ |
1519 | &reloc_root->root_key, root_item); |
1520 | BUG_ON(ret); | |
7585717f CM |
1521 | |
1522 | out: | |
5d4f98a2 YZ |
1523 | return 0; |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * helper to find first cached inode with inode number >= objectid | |
1528 | * in a subvolume | |
1529 | */ | |
1530 | static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) | |
1531 | { | |
1532 | struct rb_node *node; | |
1533 | struct rb_node *prev; | |
1534 | struct btrfs_inode *entry; | |
1535 | struct inode *inode; | |
1536 | ||
1537 | spin_lock(&root->inode_lock); | |
1538 | again: | |
1539 | node = root->inode_tree.rb_node; | |
1540 | prev = NULL; | |
1541 | while (node) { | |
1542 | prev = node; | |
1543 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
1544 | ||
4a0cc7ca | 1545 | if (objectid < btrfs_ino(entry)) |
5d4f98a2 | 1546 | node = node->rb_left; |
4a0cc7ca | 1547 | else if (objectid > btrfs_ino(entry)) |
5d4f98a2 YZ |
1548 | node = node->rb_right; |
1549 | else | |
1550 | break; | |
1551 | } | |
1552 | if (!node) { | |
1553 | while (prev) { | |
1554 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
4a0cc7ca | 1555 | if (objectid <= btrfs_ino(entry)) { |
5d4f98a2 YZ |
1556 | node = prev; |
1557 | break; | |
1558 | } | |
1559 | prev = rb_next(prev); | |
1560 | } | |
1561 | } | |
1562 | while (node) { | |
1563 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
1564 | inode = igrab(&entry->vfs_inode); | |
1565 | if (inode) { | |
1566 | spin_unlock(&root->inode_lock); | |
1567 | return inode; | |
1568 | } | |
1569 | ||
4a0cc7ca | 1570 | objectid = btrfs_ino(entry) + 1; |
5d4f98a2 YZ |
1571 | if (cond_resched_lock(&root->inode_lock)) |
1572 | goto again; | |
1573 | ||
1574 | node = rb_next(node); | |
1575 | } | |
1576 | spin_unlock(&root->inode_lock); | |
1577 | return NULL; | |
1578 | } | |
1579 | ||
1580 | static int in_block_group(u64 bytenr, | |
1581 | struct btrfs_block_group_cache *block_group) | |
1582 | { | |
1583 | if (bytenr >= block_group->key.objectid && | |
1584 | bytenr < block_group->key.objectid + block_group->key.offset) | |
1585 | return 1; | |
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | /* | |
1590 | * get new location of data | |
1591 | */ | |
1592 | static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, | |
1593 | u64 bytenr, u64 num_bytes) | |
1594 | { | |
1595 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; | |
1596 | struct btrfs_path *path; | |
1597 | struct btrfs_file_extent_item *fi; | |
1598 | struct extent_buffer *leaf; | |
1599 | int ret; | |
1600 | ||
1601 | path = btrfs_alloc_path(); | |
1602 | if (!path) | |
1603 | return -ENOMEM; | |
1604 | ||
1605 | bytenr -= BTRFS_I(reloc_inode)->index_cnt; | |
f85b7379 DS |
1606 | ret = btrfs_lookup_file_extent(NULL, root, path, |
1607 | btrfs_ino(BTRFS_I(reloc_inode)), bytenr, 0); | |
5d4f98a2 YZ |
1608 | if (ret < 0) |
1609 | goto out; | |
1610 | if (ret > 0) { | |
1611 | ret = -ENOENT; | |
1612 | goto out; | |
1613 | } | |
1614 | ||
1615 | leaf = path->nodes[0]; | |
1616 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1617 | struct btrfs_file_extent_item); | |
1618 | ||
1619 | BUG_ON(btrfs_file_extent_offset(leaf, fi) || | |
1620 | btrfs_file_extent_compression(leaf, fi) || | |
1621 | btrfs_file_extent_encryption(leaf, fi) || | |
1622 | btrfs_file_extent_other_encoding(leaf, fi)); | |
1623 | ||
1624 | if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { | |
83d4cfd4 | 1625 | ret = -EINVAL; |
5d4f98a2 YZ |
1626 | goto out; |
1627 | } | |
1628 | ||
3fd0a558 | 1629 | *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 YZ |
1630 | ret = 0; |
1631 | out: | |
1632 | btrfs_free_path(path); | |
1633 | return ret; | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * update file extent items in the tree leaf to point to | |
1638 | * the new locations. | |
1639 | */ | |
3fd0a558 YZ |
1640 | static noinline_for_stack |
1641 | int replace_file_extents(struct btrfs_trans_handle *trans, | |
1642 | struct reloc_control *rc, | |
1643 | struct btrfs_root *root, | |
1644 | struct extent_buffer *leaf) | |
5d4f98a2 | 1645 | { |
0b246afa | 1646 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
1647 | struct btrfs_key key; |
1648 | struct btrfs_file_extent_item *fi; | |
1649 | struct inode *inode = NULL; | |
5d4f98a2 YZ |
1650 | u64 parent; |
1651 | u64 bytenr; | |
3fd0a558 | 1652 | u64 new_bytenr = 0; |
5d4f98a2 YZ |
1653 | u64 num_bytes; |
1654 | u64 end; | |
1655 | u32 nritems; | |
1656 | u32 i; | |
83d4cfd4 | 1657 | int ret = 0; |
5d4f98a2 YZ |
1658 | int first = 1; |
1659 | int dirty = 0; | |
1660 | ||
1661 | if (rc->stage != UPDATE_DATA_PTRS) | |
1662 | return 0; | |
1663 | ||
1664 | /* reloc trees always use full backref */ | |
1665 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) | |
1666 | parent = leaf->start; | |
1667 | else | |
1668 | parent = 0; | |
1669 | ||
1670 | nritems = btrfs_header_nritems(leaf); | |
1671 | for (i = 0; i < nritems; i++) { | |
1672 | cond_resched(); | |
1673 | btrfs_item_key_to_cpu(leaf, &key, i); | |
1674 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
1675 | continue; | |
1676 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
1677 | if (btrfs_file_extent_type(leaf, fi) == | |
1678 | BTRFS_FILE_EXTENT_INLINE) | |
1679 | continue; | |
1680 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
1681 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
1682 | if (bytenr == 0) | |
1683 | continue; | |
1684 | if (!in_block_group(bytenr, rc->block_group)) | |
1685 | continue; | |
1686 | ||
1687 | /* | |
1688 | * if we are modifying block in fs tree, wait for readpage | |
1689 | * to complete and drop the extent cache | |
1690 | */ | |
1691 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { | |
5d4f98a2 YZ |
1692 | if (first) { |
1693 | inode = find_next_inode(root, key.objectid); | |
5d4f98a2 | 1694 | first = 0; |
4a0cc7ca | 1695 | } else if (inode && btrfs_ino(BTRFS_I(inode)) < key.objectid) { |
3fd0a558 | 1696 | btrfs_add_delayed_iput(inode); |
5d4f98a2 | 1697 | inode = find_next_inode(root, key.objectid); |
5d4f98a2 | 1698 | } |
4a0cc7ca | 1699 | if (inode && btrfs_ino(BTRFS_I(inode)) == key.objectid) { |
5d4f98a2 YZ |
1700 | end = key.offset + |
1701 | btrfs_file_extent_num_bytes(leaf, fi); | |
1702 | WARN_ON(!IS_ALIGNED(key.offset, | |
0b246afa JM |
1703 | fs_info->sectorsize)); |
1704 | WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); | |
5d4f98a2 YZ |
1705 | end--; |
1706 | ret = try_lock_extent(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1707 | key.offset, end); |
5d4f98a2 YZ |
1708 | if (!ret) |
1709 | continue; | |
1710 | ||
dcdbc059 NB |
1711 | btrfs_drop_extent_cache(BTRFS_I(inode), |
1712 | key.offset, end, 1); | |
5d4f98a2 | 1713 | unlock_extent(&BTRFS_I(inode)->io_tree, |
d0082371 | 1714 | key.offset, end); |
5d4f98a2 YZ |
1715 | } |
1716 | } | |
1717 | ||
1718 | ret = get_new_location(rc->data_inode, &new_bytenr, | |
1719 | bytenr, num_bytes); | |
83d4cfd4 JB |
1720 | if (ret) { |
1721 | /* | |
1722 | * Don't have to abort since we've not changed anything | |
1723 | * in the file extent yet. | |
1724 | */ | |
1725 | break; | |
3fd0a558 | 1726 | } |
5d4f98a2 YZ |
1727 | |
1728 | btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); | |
1729 | dirty = 1; | |
1730 | ||
1731 | key.offset -= btrfs_file_extent_offset(leaf, fi); | |
84f7d8e6 | 1732 | ret = btrfs_inc_extent_ref(trans, root, new_bytenr, |
5d4f98a2 YZ |
1733 | num_bytes, parent, |
1734 | btrfs_header_owner(leaf), | |
b06c4bf5 | 1735 | key.objectid, key.offset); |
83d4cfd4 | 1736 | if (ret) { |
66642832 | 1737 | btrfs_abort_transaction(trans, ret); |
83d4cfd4 JB |
1738 | break; |
1739 | } | |
5d4f98a2 | 1740 | |
84f7d8e6 | 1741 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
5d4f98a2 | 1742 | parent, btrfs_header_owner(leaf), |
b06c4bf5 | 1743 | key.objectid, key.offset); |
83d4cfd4 | 1744 | if (ret) { |
66642832 | 1745 | btrfs_abort_transaction(trans, ret); |
83d4cfd4 JB |
1746 | break; |
1747 | } | |
5d4f98a2 YZ |
1748 | } |
1749 | if (dirty) | |
1750 | btrfs_mark_buffer_dirty(leaf); | |
3fd0a558 YZ |
1751 | if (inode) |
1752 | btrfs_add_delayed_iput(inode); | |
83d4cfd4 | 1753 | return ret; |
5d4f98a2 YZ |
1754 | } |
1755 | ||
1756 | static noinline_for_stack | |
1757 | int memcmp_node_keys(struct extent_buffer *eb, int slot, | |
1758 | struct btrfs_path *path, int level) | |
1759 | { | |
1760 | struct btrfs_disk_key key1; | |
1761 | struct btrfs_disk_key key2; | |
1762 | btrfs_node_key(eb, &key1, slot); | |
1763 | btrfs_node_key(path->nodes[level], &key2, path->slots[level]); | |
1764 | return memcmp(&key1, &key2, sizeof(key1)); | |
1765 | } | |
1766 | ||
1767 | /* | |
1768 | * try to replace tree blocks in fs tree with the new blocks | |
1769 | * in reloc tree. tree blocks haven't been modified since the | |
1770 | * reloc tree was create can be replaced. | |
1771 | * | |
1772 | * if a block was replaced, level of the block + 1 is returned. | |
1773 | * if no block got replaced, 0 is returned. if there are other | |
1774 | * errors, a negative error number is returned. | |
1775 | */ | |
3fd0a558 YZ |
1776 | static noinline_for_stack |
1777 | int replace_path(struct btrfs_trans_handle *trans, | |
1778 | struct btrfs_root *dest, struct btrfs_root *src, | |
1779 | struct btrfs_path *path, struct btrfs_key *next_key, | |
1780 | int lowest_level, int max_level) | |
5d4f98a2 | 1781 | { |
0b246afa | 1782 | struct btrfs_fs_info *fs_info = dest->fs_info; |
5d4f98a2 YZ |
1783 | struct extent_buffer *eb; |
1784 | struct extent_buffer *parent; | |
1785 | struct btrfs_key key; | |
1786 | u64 old_bytenr; | |
1787 | u64 new_bytenr; | |
1788 | u64 old_ptr_gen; | |
1789 | u64 new_ptr_gen; | |
1790 | u64 last_snapshot; | |
1791 | u32 blocksize; | |
3fd0a558 | 1792 | int cow = 0; |
5d4f98a2 YZ |
1793 | int level; |
1794 | int ret; | |
1795 | int slot; | |
1796 | ||
1797 | BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
1798 | BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); | |
5d4f98a2 YZ |
1799 | |
1800 | last_snapshot = btrfs_root_last_snapshot(&src->root_item); | |
3fd0a558 | 1801 | again: |
5d4f98a2 YZ |
1802 | slot = path->slots[lowest_level]; |
1803 | btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); | |
1804 | ||
1805 | eb = btrfs_lock_root_node(dest); | |
1806 | btrfs_set_lock_blocking(eb); | |
1807 | level = btrfs_header_level(eb); | |
1808 | ||
1809 | if (level < lowest_level) { | |
1810 | btrfs_tree_unlock(eb); | |
1811 | free_extent_buffer(eb); | |
1812 | return 0; | |
1813 | } | |
1814 | ||
3fd0a558 YZ |
1815 | if (cow) { |
1816 | ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); | |
1817 | BUG_ON(ret); | |
1818 | } | |
5d4f98a2 YZ |
1819 | btrfs_set_lock_blocking(eb); |
1820 | ||
1821 | if (next_key) { | |
1822 | next_key->objectid = (u64)-1; | |
1823 | next_key->type = (u8)-1; | |
1824 | next_key->offset = (u64)-1; | |
1825 | } | |
1826 | ||
1827 | parent = eb; | |
1828 | while (1) { | |
581c1760 QW |
1829 | struct btrfs_key first_key; |
1830 | ||
5d4f98a2 YZ |
1831 | level = btrfs_header_level(parent); |
1832 | BUG_ON(level < lowest_level); | |
1833 | ||
1834 | ret = btrfs_bin_search(parent, &key, level, &slot); | |
1835 | if (ret && slot > 0) | |
1836 | slot--; | |
1837 | ||
1838 | if (next_key && slot + 1 < btrfs_header_nritems(parent)) | |
1839 | btrfs_node_key_to_cpu(parent, next_key, slot + 1); | |
1840 | ||
1841 | old_bytenr = btrfs_node_blockptr(parent, slot); | |
0b246afa | 1842 | blocksize = fs_info->nodesize; |
5d4f98a2 | 1843 | old_ptr_gen = btrfs_node_ptr_generation(parent, slot); |
17515f1b | 1844 | btrfs_node_key_to_cpu(parent, &first_key, slot); |
5d4f98a2 YZ |
1845 | |
1846 | if (level <= max_level) { | |
1847 | eb = path->nodes[level]; | |
1848 | new_bytenr = btrfs_node_blockptr(eb, | |
1849 | path->slots[level]); | |
1850 | new_ptr_gen = btrfs_node_ptr_generation(eb, | |
1851 | path->slots[level]); | |
1852 | } else { | |
1853 | new_bytenr = 0; | |
1854 | new_ptr_gen = 0; | |
1855 | } | |
1856 | ||
fae7f21c | 1857 | if (WARN_ON(new_bytenr > 0 && new_bytenr == old_bytenr)) { |
5d4f98a2 YZ |
1858 | ret = level; |
1859 | break; | |
1860 | } | |
1861 | ||
1862 | if (new_bytenr == 0 || old_ptr_gen > last_snapshot || | |
1863 | memcmp_node_keys(parent, slot, path, level)) { | |
3fd0a558 | 1864 | if (level <= lowest_level) { |
5d4f98a2 YZ |
1865 | ret = 0; |
1866 | break; | |
1867 | } | |
1868 | ||
581c1760 QW |
1869 | eb = read_tree_block(fs_info, old_bytenr, old_ptr_gen, |
1870 | level - 1, &first_key); | |
64c043de LB |
1871 | if (IS_ERR(eb)) { |
1872 | ret = PTR_ERR(eb); | |
264813ac | 1873 | break; |
64c043de LB |
1874 | } else if (!extent_buffer_uptodate(eb)) { |
1875 | ret = -EIO; | |
416bc658 | 1876 | free_extent_buffer(eb); |
379cde74 | 1877 | break; |
416bc658 | 1878 | } |
5d4f98a2 | 1879 | btrfs_tree_lock(eb); |
3fd0a558 YZ |
1880 | if (cow) { |
1881 | ret = btrfs_cow_block(trans, dest, eb, parent, | |
1882 | slot, &eb); | |
1883 | BUG_ON(ret); | |
5d4f98a2 | 1884 | } |
3fd0a558 | 1885 | btrfs_set_lock_blocking(eb); |
5d4f98a2 YZ |
1886 | |
1887 | btrfs_tree_unlock(parent); | |
1888 | free_extent_buffer(parent); | |
1889 | ||
1890 | parent = eb; | |
1891 | continue; | |
1892 | } | |
1893 | ||
3fd0a558 YZ |
1894 | if (!cow) { |
1895 | btrfs_tree_unlock(parent); | |
1896 | free_extent_buffer(parent); | |
1897 | cow = 1; | |
1898 | goto again; | |
1899 | } | |
1900 | ||
5d4f98a2 YZ |
1901 | btrfs_node_key_to_cpu(path->nodes[level], &key, |
1902 | path->slots[level]); | |
b3b4aa74 | 1903 | btrfs_release_path(path); |
5d4f98a2 YZ |
1904 | |
1905 | path->lowest_level = level; | |
1906 | ret = btrfs_search_slot(trans, src, &key, path, 0, 1); | |
1907 | path->lowest_level = 0; | |
1908 | BUG_ON(ret); | |
1909 | ||
824d8dff QW |
1910 | /* |
1911 | * Info qgroup to trace both subtrees. | |
1912 | * | |
1913 | * We must trace both trees. | |
1914 | * 1) Tree reloc subtree | |
1915 | * If not traced, we will leak data numbers | |
1916 | * 2) Fs subtree | |
1917 | * If not traced, we will double count old data | |
1918 | * and tree block numbers, if current trans doesn't free | |
1919 | * data reloc tree inode. | |
1920 | */ | |
1921 | ret = btrfs_qgroup_trace_subtree(trans, src, parent, | |
1922 | btrfs_header_generation(parent), | |
1923 | btrfs_header_level(parent)); | |
1924 | if (ret < 0) | |
1925 | break; | |
1926 | ret = btrfs_qgroup_trace_subtree(trans, dest, | |
1927 | path->nodes[level], | |
1928 | btrfs_header_generation(path->nodes[level]), | |
1929 | btrfs_header_level(path->nodes[level])); | |
1930 | if (ret < 0) | |
1931 | break; | |
1932 | ||
5d4f98a2 YZ |
1933 | /* |
1934 | * swap blocks in fs tree and reloc tree. | |
1935 | */ | |
1936 | btrfs_set_node_blockptr(parent, slot, new_bytenr); | |
1937 | btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); | |
1938 | btrfs_mark_buffer_dirty(parent); | |
1939 | ||
1940 | btrfs_set_node_blockptr(path->nodes[level], | |
1941 | path->slots[level], old_bytenr); | |
1942 | btrfs_set_node_ptr_generation(path->nodes[level], | |
1943 | path->slots[level], old_ptr_gen); | |
1944 | btrfs_mark_buffer_dirty(path->nodes[level]); | |
1945 | ||
84f7d8e6 | 1946 | ret = btrfs_inc_extent_ref(trans, src, old_bytenr, |
2ff7e61e | 1947 | blocksize, path->nodes[level]->start, |
b06c4bf5 | 1948 | src->root_key.objectid, level - 1, 0); |
5d4f98a2 | 1949 | BUG_ON(ret); |
84f7d8e6 | 1950 | ret = btrfs_inc_extent_ref(trans, dest, new_bytenr, |
2ff7e61e JM |
1951 | blocksize, 0, dest->root_key.objectid, |
1952 | level - 1, 0); | |
5d4f98a2 YZ |
1953 | BUG_ON(ret); |
1954 | ||
84f7d8e6 | 1955 | ret = btrfs_free_extent(trans, src, new_bytenr, blocksize, |
5d4f98a2 | 1956 | path->nodes[level]->start, |
b06c4bf5 | 1957 | src->root_key.objectid, level - 1, 0); |
5d4f98a2 YZ |
1958 | BUG_ON(ret); |
1959 | ||
84f7d8e6 | 1960 | ret = btrfs_free_extent(trans, dest, old_bytenr, blocksize, |
5d4f98a2 | 1961 | 0, dest->root_key.objectid, level - 1, |
b06c4bf5 | 1962 | 0); |
5d4f98a2 YZ |
1963 | BUG_ON(ret); |
1964 | ||
1965 | btrfs_unlock_up_safe(path, 0); | |
1966 | ||
1967 | ret = level; | |
1968 | break; | |
1969 | } | |
1970 | btrfs_tree_unlock(parent); | |
1971 | free_extent_buffer(parent); | |
1972 | return ret; | |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * helper to find next relocated block in reloc tree | |
1977 | */ | |
1978 | static noinline_for_stack | |
1979 | int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, | |
1980 | int *level) | |
1981 | { | |
1982 | struct extent_buffer *eb; | |
1983 | int i; | |
1984 | u64 last_snapshot; | |
1985 | u32 nritems; | |
1986 | ||
1987 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); | |
1988 | ||
1989 | for (i = 0; i < *level; i++) { | |
1990 | free_extent_buffer(path->nodes[i]); | |
1991 | path->nodes[i] = NULL; | |
1992 | } | |
1993 | ||
1994 | for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { | |
1995 | eb = path->nodes[i]; | |
1996 | nritems = btrfs_header_nritems(eb); | |
1997 | while (path->slots[i] + 1 < nritems) { | |
1998 | path->slots[i]++; | |
1999 | if (btrfs_node_ptr_generation(eb, path->slots[i]) <= | |
2000 | last_snapshot) | |
2001 | continue; | |
2002 | ||
2003 | *level = i; | |
2004 | return 0; | |
2005 | } | |
2006 | free_extent_buffer(path->nodes[i]); | |
2007 | path->nodes[i] = NULL; | |
2008 | } | |
2009 | return 1; | |
2010 | } | |
2011 | ||
2012 | /* | |
2013 | * walk down reloc tree to find relocated block of lowest level | |
2014 | */ | |
2015 | static noinline_for_stack | |
2016 | int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, | |
2017 | int *level) | |
2018 | { | |
2ff7e61e | 2019 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
2020 | struct extent_buffer *eb = NULL; |
2021 | int i; | |
2022 | u64 bytenr; | |
2023 | u64 ptr_gen = 0; | |
2024 | u64 last_snapshot; | |
5d4f98a2 YZ |
2025 | u32 nritems; |
2026 | ||
2027 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); | |
2028 | ||
2029 | for (i = *level; i > 0; i--) { | |
581c1760 QW |
2030 | struct btrfs_key first_key; |
2031 | ||
5d4f98a2 YZ |
2032 | eb = path->nodes[i]; |
2033 | nritems = btrfs_header_nritems(eb); | |
2034 | while (path->slots[i] < nritems) { | |
2035 | ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); | |
2036 | if (ptr_gen > last_snapshot) | |
2037 | break; | |
2038 | path->slots[i]++; | |
2039 | } | |
2040 | if (path->slots[i] >= nritems) { | |
2041 | if (i == *level) | |
2042 | break; | |
2043 | *level = i + 1; | |
2044 | return 0; | |
2045 | } | |
2046 | if (i == 1) { | |
2047 | *level = i; | |
2048 | return 0; | |
2049 | } | |
2050 | ||
2051 | bytenr = btrfs_node_blockptr(eb, path->slots[i]); | |
581c1760 QW |
2052 | btrfs_node_key_to_cpu(eb, &first_key, path->slots[i]); |
2053 | eb = read_tree_block(fs_info, bytenr, ptr_gen, i - 1, | |
2054 | &first_key); | |
64c043de LB |
2055 | if (IS_ERR(eb)) { |
2056 | return PTR_ERR(eb); | |
2057 | } else if (!extent_buffer_uptodate(eb)) { | |
416bc658 JB |
2058 | free_extent_buffer(eb); |
2059 | return -EIO; | |
2060 | } | |
5d4f98a2 YZ |
2061 | BUG_ON(btrfs_header_level(eb) != i - 1); |
2062 | path->nodes[i - 1] = eb; | |
2063 | path->slots[i - 1] = 0; | |
2064 | } | |
2065 | return 1; | |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * invalidate extent cache for file extents whose key in range of | |
2070 | * [min_key, max_key) | |
2071 | */ | |
2072 | static int invalidate_extent_cache(struct btrfs_root *root, | |
2073 | struct btrfs_key *min_key, | |
2074 | struct btrfs_key *max_key) | |
2075 | { | |
0b246afa | 2076 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
2077 | struct inode *inode = NULL; |
2078 | u64 objectid; | |
2079 | u64 start, end; | |
33345d01 | 2080 | u64 ino; |
5d4f98a2 YZ |
2081 | |
2082 | objectid = min_key->objectid; | |
2083 | while (1) { | |
2084 | cond_resched(); | |
2085 | iput(inode); | |
2086 | ||
2087 | if (objectid > max_key->objectid) | |
2088 | break; | |
2089 | ||
2090 | inode = find_next_inode(root, objectid); | |
2091 | if (!inode) | |
2092 | break; | |
4a0cc7ca | 2093 | ino = btrfs_ino(BTRFS_I(inode)); |
5d4f98a2 | 2094 | |
33345d01 | 2095 | if (ino > max_key->objectid) { |
5d4f98a2 YZ |
2096 | iput(inode); |
2097 | break; | |
2098 | } | |
2099 | ||
33345d01 | 2100 | objectid = ino + 1; |
5d4f98a2 YZ |
2101 | if (!S_ISREG(inode->i_mode)) |
2102 | continue; | |
2103 | ||
33345d01 | 2104 | if (unlikely(min_key->objectid == ino)) { |
5d4f98a2 YZ |
2105 | if (min_key->type > BTRFS_EXTENT_DATA_KEY) |
2106 | continue; | |
2107 | if (min_key->type < BTRFS_EXTENT_DATA_KEY) | |
2108 | start = 0; | |
2109 | else { | |
2110 | start = min_key->offset; | |
0b246afa | 2111 | WARN_ON(!IS_ALIGNED(start, fs_info->sectorsize)); |
5d4f98a2 YZ |
2112 | } |
2113 | } else { | |
2114 | start = 0; | |
2115 | } | |
2116 | ||
33345d01 | 2117 | if (unlikely(max_key->objectid == ino)) { |
5d4f98a2 YZ |
2118 | if (max_key->type < BTRFS_EXTENT_DATA_KEY) |
2119 | continue; | |
2120 | if (max_key->type > BTRFS_EXTENT_DATA_KEY) { | |
2121 | end = (u64)-1; | |
2122 | } else { | |
2123 | if (max_key->offset == 0) | |
2124 | continue; | |
2125 | end = max_key->offset; | |
0b246afa | 2126 | WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); |
5d4f98a2 YZ |
2127 | end--; |
2128 | } | |
2129 | } else { | |
2130 | end = (u64)-1; | |
2131 | } | |
2132 | ||
2133 | /* the lock_extent waits for readpage to complete */ | |
d0082371 | 2134 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
dcdbc059 | 2135 | btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 1); |
d0082371 | 2136 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
5d4f98a2 YZ |
2137 | } |
2138 | return 0; | |
2139 | } | |
2140 | ||
2141 | static int find_next_key(struct btrfs_path *path, int level, | |
2142 | struct btrfs_key *key) | |
2143 | ||
2144 | { | |
2145 | while (level < BTRFS_MAX_LEVEL) { | |
2146 | if (!path->nodes[level]) | |
2147 | break; | |
2148 | if (path->slots[level] + 1 < | |
2149 | btrfs_header_nritems(path->nodes[level])) { | |
2150 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
2151 | path->slots[level] + 1); | |
2152 | return 0; | |
2153 | } | |
2154 | level++; | |
2155 | } | |
2156 | return 1; | |
2157 | } | |
2158 | ||
2159 | /* | |
2160 | * merge the relocated tree blocks in reloc tree with corresponding | |
2161 | * fs tree. | |
2162 | */ | |
2163 | static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, | |
2164 | struct btrfs_root *root) | |
2165 | { | |
0b246afa | 2166 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 YZ |
2167 | LIST_HEAD(inode_list); |
2168 | struct btrfs_key key; | |
2169 | struct btrfs_key next_key; | |
9e6a0c52 | 2170 | struct btrfs_trans_handle *trans = NULL; |
5d4f98a2 YZ |
2171 | struct btrfs_root *reloc_root; |
2172 | struct btrfs_root_item *root_item; | |
2173 | struct btrfs_path *path; | |
3fd0a558 | 2174 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2175 | int level; |
2176 | int max_level; | |
2177 | int replaced = 0; | |
2178 | int ret; | |
2179 | int err = 0; | |
3fd0a558 | 2180 | u32 min_reserved; |
5d4f98a2 YZ |
2181 | |
2182 | path = btrfs_alloc_path(); | |
2183 | if (!path) | |
2184 | return -ENOMEM; | |
e4058b54 | 2185 | path->reada = READA_FORWARD; |
5d4f98a2 YZ |
2186 | |
2187 | reloc_root = root->reloc_root; | |
2188 | root_item = &reloc_root->root_item; | |
2189 | ||
2190 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { | |
2191 | level = btrfs_root_level(root_item); | |
2192 | extent_buffer_get(reloc_root->node); | |
2193 | path->nodes[level] = reloc_root->node; | |
2194 | path->slots[level] = 0; | |
2195 | } else { | |
2196 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); | |
2197 | ||
2198 | level = root_item->drop_level; | |
2199 | BUG_ON(level == 0); | |
2200 | path->lowest_level = level; | |
2201 | ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); | |
33c66f43 | 2202 | path->lowest_level = 0; |
5d4f98a2 YZ |
2203 | if (ret < 0) { |
2204 | btrfs_free_path(path); | |
2205 | return ret; | |
2206 | } | |
2207 | ||
2208 | btrfs_node_key_to_cpu(path->nodes[level], &next_key, | |
2209 | path->slots[level]); | |
2210 | WARN_ON(memcmp(&key, &next_key, sizeof(key))); | |
2211 | ||
2212 | btrfs_unlock_up_safe(path, 0); | |
2213 | } | |
2214 | ||
0b246afa | 2215 | min_reserved = fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; |
3fd0a558 | 2216 | memset(&next_key, 0, sizeof(next_key)); |
5d4f98a2 | 2217 | |
3fd0a558 | 2218 | while (1) { |
08e007d2 MX |
2219 | ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved, |
2220 | BTRFS_RESERVE_FLUSH_ALL); | |
3fd0a558 | 2221 | if (ret) { |
9e6a0c52 JB |
2222 | err = ret; |
2223 | goto out; | |
5d4f98a2 | 2224 | } |
9e6a0c52 JB |
2225 | trans = btrfs_start_transaction(root, 0); |
2226 | if (IS_ERR(trans)) { | |
2227 | err = PTR_ERR(trans); | |
2228 | trans = NULL; | |
2229 | goto out; | |
2230 | } | |
2231 | trans->block_rsv = rc->block_rsv; | |
5d4f98a2 | 2232 | |
5d4f98a2 | 2233 | replaced = 0; |
5d4f98a2 YZ |
2234 | max_level = level; |
2235 | ||
2236 | ret = walk_down_reloc_tree(reloc_root, path, &level); | |
2237 | if (ret < 0) { | |
2238 | err = ret; | |
2239 | goto out; | |
2240 | } | |
2241 | if (ret > 0) | |
2242 | break; | |
2243 | ||
2244 | if (!find_next_key(path, level, &key) && | |
2245 | btrfs_comp_cpu_keys(&next_key, &key) >= 0) { | |
2246 | ret = 0; | |
5d4f98a2 | 2247 | } else { |
3fd0a558 YZ |
2248 | ret = replace_path(trans, root, reloc_root, path, |
2249 | &next_key, level, max_level); | |
5d4f98a2 YZ |
2250 | } |
2251 | if (ret < 0) { | |
2252 | err = ret; | |
2253 | goto out; | |
2254 | } | |
2255 | ||
2256 | if (ret > 0) { | |
2257 | level = ret; | |
2258 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
2259 | path->slots[level]); | |
2260 | replaced = 1; | |
5d4f98a2 YZ |
2261 | } |
2262 | ||
2263 | ret = walk_up_reloc_tree(reloc_root, path, &level); | |
2264 | if (ret > 0) | |
2265 | break; | |
2266 | ||
2267 | BUG_ON(level == 0); | |
2268 | /* | |
2269 | * save the merging progress in the drop_progress. | |
2270 | * this is OK since root refs == 1 in this case. | |
2271 | */ | |
2272 | btrfs_node_key(path->nodes[level], &root_item->drop_progress, | |
2273 | path->slots[level]); | |
2274 | root_item->drop_level = level; | |
2275 | ||
3a45bb20 | 2276 | btrfs_end_transaction_throttle(trans); |
9e6a0c52 | 2277 | trans = NULL; |
5d4f98a2 | 2278 | |
2ff7e61e | 2279 | btrfs_btree_balance_dirty(fs_info); |
5d4f98a2 YZ |
2280 | |
2281 | if (replaced && rc->stage == UPDATE_DATA_PTRS) | |
2282 | invalidate_extent_cache(root, &key, &next_key); | |
2283 | } | |
2284 | ||
2285 | /* | |
2286 | * handle the case only one block in the fs tree need to be | |
2287 | * relocated and the block is tree root. | |
2288 | */ | |
2289 | leaf = btrfs_lock_root_node(root); | |
2290 | ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); | |
2291 | btrfs_tree_unlock(leaf); | |
2292 | free_extent_buffer(leaf); | |
2293 | if (ret < 0) | |
2294 | err = ret; | |
2295 | out: | |
2296 | btrfs_free_path(path); | |
2297 | ||
2298 | if (err == 0) { | |
2299 | memset(&root_item->drop_progress, 0, | |
2300 | sizeof(root_item->drop_progress)); | |
2301 | root_item->drop_level = 0; | |
2302 | btrfs_set_root_refs(root_item, 0); | |
3fd0a558 | 2303 | btrfs_update_reloc_root(trans, root); |
5d4f98a2 YZ |
2304 | } |
2305 | ||
9e6a0c52 | 2306 | if (trans) |
3a45bb20 | 2307 | btrfs_end_transaction_throttle(trans); |
5d4f98a2 | 2308 | |
2ff7e61e | 2309 | btrfs_btree_balance_dirty(fs_info); |
5d4f98a2 | 2310 | |
5d4f98a2 YZ |
2311 | if (replaced && rc->stage == UPDATE_DATA_PTRS) |
2312 | invalidate_extent_cache(root, &key, &next_key); | |
2313 | ||
2314 | return err; | |
2315 | } | |
2316 | ||
3fd0a558 YZ |
2317 | static noinline_for_stack |
2318 | int prepare_to_merge(struct reloc_control *rc, int err) | |
5d4f98a2 | 2319 | { |
3fd0a558 | 2320 | struct btrfs_root *root = rc->extent_root; |
0b246afa | 2321 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 | 2322 | struct btrfs_root *reloc_root; |
3fd0a558 YZ |
2323 | struct btrfs_trans_handle *trans; |
2324 | LIST_HEAD(reloc_roots); | |
2325 | u64 num_bytes = 0; | |
2326 | int ret; | |
3fd0a558 | 2327 | |
0b246afa JM |
2328 | mutex_lock(&fs_info->reloc_mutex); |
2329 | rc->merging_rsv_size += fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; | |
3fd0a558 | 2330 | rc->merging_rsv_size += rc->nodes_relocated * 2; |
0b246afa | 2331 | mutex_unlock(&fs_info->reloc_mutex); |
7585717f | 2332 | |
3fd0a558 YZ |
2333 | again: |
2334 | if (!err) { | |
2335 | num_bytes = rc->merging_rsv_size; | |
08e007d2 MX |
2336 | ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, |
2337 | BTRFS_RESERVE_FLUSH_ALL); | |
3fd0a558 YZ |
2338 | if (ret) |
2339 | err = ret; | |
2340 | } | |
2341 | ||
7a7eaa40 | 2342 | trans = btrfs_join_transaction(rc->extent_root); |
3612b495 TI |
2343 | if (IS_ERR(trans)) { |
2344 | if (!err) | |
2ff7e61e JM |
2345 | btrfs_block_rsv_release(fs_info, rc->block_rsv, |
2346 | num_bytes); | |
3612b495 TI |
2347 | return PTR_ERR(trans); |
2348 | } | |
3fd0a558 YZ |
2349 | |
2350 | if (!err) { | |
2351 | if (num_bytes != rc->merging_rsv_size) { | |
3a45bb20 | 2352 | btrfs_end_transaction(trans); |
2ff7e61e JM |
2353 | btrfs_block_rsv_release(fs_info, rc->block_rsv, |
2354 | num_bytes); | |
3fd0a558 YZ |
2355 | goto again; |
2356 | } | |
2357 | } | |
5d4f98a2 | 2358 | |
3fd0a558 YZ |
2359 | rc->merge_reloc_tree = 1; |
2360 | ||
2361 | while (!list_empty(&rc->reloc_roots)) { | |
2362 | reloc_root = list_entry(rc->reloc_roots.next, | |
2363 | struct btrfs_root, root_list); | |
2364 | list_del_init(&reloc_root->root_list); | |
5d4f98a2 | 2365 | |
0b246afa | 2366 | root = read_fs_root(fs_info, reloc_root->root_key.offset); |
5d4f98a2 YZ |
2367 | BUG_ON(IS_ERR(root)); |
2368 | BUG_ON(root->reloc_root != reloc_root); | |
2369 | ||
3fd0a558 YZ |
2370 | /* |
2371 | * set reference count to 1, so btrfs_recover_relocation | |
2372 | * knows it should resumes merging | |
2373 | */ | |
2374 | if (!err) | |
2375 | btrfs_set_root_refs(&reloc_root->root_item, 1); | |
5d4f98a2 | 2376 | btrfs_update_reloc_root(trans, root); |
5d4f98a2 | 2377 | |
3fd0a558 YZ |
2378 | list_add(&reloc_root->root_list, &reloc_roots); |
2379 | } | |
5d4f98a2 | 2380 | |
3fd0a558 | 2381 | list_splice(&reloc_roots, &rc->reloc_roots); |
5d4f98a2 | 2382 | |
3fd0a558 | 2383 | if (!err) |
3a45bb20 | 2384 | btrfs_commit_transaction(trans); |
3fd0a558 | 2385 | else |
3a45bb20 | 2386 | btrfs_end_transaction(trans); |
3fd0a558 | 2387 | return err; |
5d4f98a2 YZ |
2388 | } |
2389 | ||
aca1bba6 LB |
2390 | static noinline_for_stack |
2391 | void free_reloc_roots(struct list_head *list) | |
2392 | { | |
2393 | struct btrfs_root *reloc_root; | |
2394 | ||
2395 | while (!list_empty(list)) { | |
2396 | reloc_root = list_entry(list->next, struct btrfs_root, | |
2397 | root_list); | |
bb166d72 | 2398 | __del_reloc_root(reloc_root); |
6bdf131f JB |
2399 | free_extent_buffer(reloc_root->node); |
2400 | free_extent_buffer(reloc_root->commit_root); | |
2401 | reloc_root->node = NULL; | |
2402 | reloc_root->commit_root = NULL; | |
aca1bba6 LB |
2403 | } |
2404 | } | |
2405 | ||
3fd0a558 | 2406 | static noinline_for_stack |
94404e82 | 2407 | void merge_reloc_roots(struct reloc_control *rc) |
5d4f98a2 | 2408 | { |
0b246afa | 2409 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 | 2410 | struct btrfs_root *root; |
3fd0a558 YZ |
2411 | struct btrfs_root *reloc_root; |
2412 | LIST_HEAD(reloc_roots); | |
2413 | int found = 0; | |
aca1bba6 | 2414 | int ret = 0; |
3fd0a558 YZ |
2415 | again: |
2416 | root = rc->extent_root; | |
7585717f CM |
2417 | |
2418 | /* | |
2419 | * this serializes us with btrfs_record_root_in_transaction, | |
2420 | * we have to make sure nobody is in the middle of | |
2421 | * adding their roots to the list while we are | |
2422 | * doing this splice | |
2423 | */ | |
0b246afa | 2424 | mutex_lock(&fs_info->reloc_mutex); |
3fd0a558 | 2425 | list_splice_init(&rc->reloc_roots, &reloc_roots); |
0b246afa | 2426 | mutex_unlock(&fs_info->reloc_mutex); |
5d4f98a2 | 2427 | |
3fd0a558 YZ |
2428 | while (!list_empty(&reloc_roots)) { |
2429 | found = 1; | |
2430 | reloc_root = list_entry(reloc_roots.next, | |
2431 | struct btrfs_root, root_list); | |
5d4f98a2 | 2432 | |
3fd0a558 | 2433 | if (btrfs_root_refs(&reloc_root->root_item) > 0) { |
0b246afa | 2434 | root = read_fs_root(fs_info, |
3fd0a558 YZ |
2435 | reloc_root->root_key.offset); |
2436 | BUG_ON(IS_ERR(root)); | |
2437 | BUG_ON(root->reloc_root != reloc_root); | |
5d4f98a2 | 2438 | |
3fd0a558 | 2439 | ret = merge_reloc_root(rc, root); |
b37b39cd | 2440 | if (ret) { |
25e293c2 WS |
2441 | if (list_empty(&reloc_root->root_list)) |
2442 | list_add_tail(&reloc_root->root_list, | |
2443 | &reloc_roots); | |
aca1bba6 | 2444 | goto out; |
b37b39cd | 2445 | } |
3fd0a558 YZ |
2446 | } else { |
2447 | list_del_init(&reloc_root->root_list); | |
2448 | } | |
5bc7247a | 2449 | |
2c536799 | 2450 | ret = btrfs_drop_snapshot(reloc_root, rc->block_rsv, 0, 1); |
aca1bba6 LB |
2451 | if (ret < 0) { |
2452 | if (list_empty(&reloc_root->root_list)) | |
2453 | list_add_tail(&reloc_root->root_list, | |
2454 | &reloc_roots); | |
2455 | goto out; | |
2456 | } | |
5d4f98a2 YZ |
2457 | } |
2458 | ||
3fd0a558 YZ |
2459 | if (found) { |
2460 | found = 0; | |
2461 | goto again; | |
2462 | } | |
aca1bba6 LB |
2463 | out: |
2464 | if (ret) { | |
0b246afa | 2465 | btrfs_handle_fs_error(fs_info, ret, NULL); |
aca1bba6 LB |
2466 | if (!list_empty(&reloc_roots)) |
2467 | free_reloc_roots(&reloc_roots); | |
467bb1d2 WS |
2468 | |
2469 | /* new reloc root may be added */ | |
0b246afa | 2470 | mutex_lock(&fs_info->reloc_mutex); |
467bb1d2 | 2471 | list_splice_init(&rc->reloc_roots, &reloc_roots); |
0b246afa | 2472 | mutex_unlock(&fs_info->reloc_mutex); |
467bb1d2 WS |
2473 | if (!list_empty(&reloc_roots)) |
2474 | free_reloc_roots(&reloc_roots); | |
aca1bba6 LB |
2475 | } |
2476 | ||
5d4f98a2 | 2477 | BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); |
5d4f98a2 YZ |
2478 | } |
2479 | ||
2480 | static void free_block_list(struct rb_root *blocks) | |
2481 | { | |
2482 | struct tree_block *block; | |
2483 | struct rb_node *rb_node; | |
2484 | while ((rb_node = rb_first(blocks))) { | |
2485 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
2486 | rb_erase(rb_node, blocks); | |
2487 | kfree(block); | |
2488 | } | |
2489 | } | |
2490 | ||
2491 | static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, | |
2492 | struct btrfs_root *reloc_root) | |
2493 | { | |
0b246afa | 2494 | struct btrfs_fs_info *fs_info = reloc_root->fs_info; |
5d4f98a2 YZ |
2495 | struct btrfs_root *root; |
2496 | ||
2497 | if (reloc_root->last_trans == trans->transid) | |
2498 | return 0; | |
2499 | ||
0b246afa | 2500 | root = read_fs_root(fs_info, reloc_root->root_key.offset); |
5d4f98a2 YZ |
2501 | BUG_ON(IS_ERR(root)); |
2502 | BUG_ON(root->reloc_root != reloc_root); | |
2503 | ||
2504 | return btrfs_record_root_in_trans(trans, root); | |
2505 | } | |
2506 | ||
3fd0a558 YZ |
2507 | static noinline_for_stack |
2508 | struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, | |
2509 | struct reloc_control *rc, | |
2510 | struct backref_node *node, | |
dc4103f9 | 2511 | struct backref_edge *edges[]) |
5d4f98a2 YZ |
2512 | { |
2513 | struct backref_node *next; | |
2514 | struct btrfs_root *root; | |
3fd0a558 YZ |
2515 | int index = 0; |
2516 | ||
5d4f98a2 YZ |
2517 | next = node; |
2518 | while (1) { | |
2519 | cond_resched(); | |
2520 | next = walk_up_backref(next, edges, &index); | |
2521 | root = next->root; | |
3fd0a558 | 2522 | BUG_ON(!root); |
27cdeb70 | 2523 | BUG_ON(!test_bit(BTRFS_ROOT_REF_COWS, &root->state)); |
5d4f98a2 YZ |
2524 | |
2525 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
2526 | record_reloc_root_in_trans(trans, root); | |
2527 | break; | |
2528 | } | |
2529 | ||
3fd0a558 YZ |
2530 | btrfs_record_root_in_trans(trans, root); |
2531 | root = root->reloc_root; | |
2532 | ||
2533 | if (next->new_bytenr != root->node->start) { | |
2534 | BUG_ON(next->new_bytenr); | |
2535 | BUG_ON(!list_empty(&next->list)); | |
2536 | next->new_bytenr = root->node->start; | |
2537 | next->root = root; | |
2538 | list_add_tail(&next->list, | |
2539 | &rc->backref_cache.changed); | |
2540 | __mark_block_processed(rc, next); | |
5d4f98a2 YZ |
2541 | break; |
2542 | } | |
2543 | ||
3fd0a558 | 2544 | WARN_ON(1); |
5d4f98a2 YZ |
2545 | root = NULL; |
2546 | next = walk_down_backref(edges, &index); | |
2547 | if (!next || next->level <= node->level) | |
2548 | break; | |
2549 | } | |
3fd0a558 YZ |
2550 | if (!root) |
2551 | return NULL; | |
5d4f98a2 | 2552 | |
3fd0a558 YZ |
2553 | next = node; |
2554 | /* setup backref node path for btrfs_reloc_cow_block */ | |
2555 | while (1) { | |
2556 | rc->backref_cache.path[next->level] = next; | |
2557 | if (--index < 0) | |
2558 | break; | |
2559 | next = edges[index]->node[UPPER]; | |
5d4f98a2 | 2560 | } |
5d4f98a2 YZ |
2561 | return root; |
2562 | } | |
2563 | ||
3fd0a558 YZ |
2564 | /* |
2565 | * select a tree root for relocation. return NULL if the block | |
2566 | * is reference counted. we should use do_relocation() in this | |
2567 | * case. return a tree root pointer if the block isn't reference | |
2568 | * counted. return -ENOENT if the block is root of reloc tree. | |
2569 | */ | |
5d4f98a2 | 2570 | static noinline_for_stack |
147d256e | 2571 | struct btrfs_root *select_one_root(struct backref_node *node) |
5d4f98a2 | 2572 | { |
3fd0a558 YZ |
2573 | struct backref_node *next; |
2574 | struct btrfs_root *root; | |
2575 | struct btrfs_root *fs_root = NULL; | |
5d4f98a2 | 2576 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; |
3fd0a558 YZ |
2577 | int index = 0; |
2578 | ||
2579 | next = node; | |
2580 | while (1) { | |
2581 | cond_resched(); | |
2582 | next = walk_up_backref(next, edges, &index); | |
2583 | root = next->root; | |
2584 | BUG_ON(!root); | |
2585 | ||
25985edc | 2586 | /* no other choice for non-references counted tree */ |
27cdeb70 | 2587 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
3fd0a558 YZ |
2588 | return root; |
2589 | ||
2590 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) | |
2591 | fs_root = root; | |
2592 | ||
2593 | if (next != node) | |
2594 | return NULL; | |
2595 | ||
2596 | next = walk_down_backref(edges, &index); | |
2597 | if (!next || next->level <= node->level) | |
2598 | break; | |
2599 | } | |
2600 | ||
2601 | if (!fs_root) | |
2602 | return ERR_PTR(-ENOENT); | |
2603 | return fs_root; | |
5d4f98a2 YZ |
2604 | } |
2605 | ||
2606 | static noinline_for_stack | |
3fd0a558 YZ |
2607 | u64 calcu_metadata_size(struct reloc_control *rc, |
2608 | struct backref_node *node, int reserve) | |
5d4f98a2 | 2609 | { |
0b246afa | 2610 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
3fd0a558 YZ |
2611 | struct backref_node *next = node; |
2612 | struct backref_edge *edge; | |
2613 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; | |
2614 | u64 num_bytes = 0; | |
2615 | int index = 0; | |
2616 | ||
2617 | BUG_ON(reserve && node->processed); | |
2618 | ||
2619 | while (next) { | |
2620 | cond_resched(); | |
2621 | while (1) { | |
2622 | if (next->processed && (reserve || next != node)) | |
2623 | break; | |
2624 | ||
0b246afa | 2625 | num_bytes += fs_info->nodesize; |
3fd0a558 YZ |
2626 | |
2627 | if (list_empty(&next->upper)) | |
2628 | break; | |
2629 | ||
2630 | edge = list_entry(next->upper.next, | |
2631 | struct backref_edge, list[LOWER]); | |
2632 | edges[index++] = edge; | |
2633 | next = edge->node[UPPER]; | |
2634 | } | |
2635 | next = walk_down_backref(edges, &index); | |
2636 | } | |
2637 | return num_bytes; | |
5d4f98a2 YZ |
2638 | } |
2639 | ||
3fd0a558 YZ |
2640 | static int reserve_metadata_space(struct btrfs_trans_handle *trans, |
2641 | struct reloc_control *rc, | |
2642 | struct backref_node *node) | |
5d4f98a2 | 2643 | { |
3fd0a558 | 2644 | struct btrfs_root *root = rc->extent_root; |
da17066c | 2645 | struct btrfs_fs_info *fs_info = root->fs_info; |
3fd0a558 YZ |
2646 | u64 num_bytes; |
2647 | int ret; | |
0647bf56 | 2648 | u64 tmp; |
3fd0a558 YZ |
2649 | |
2650 | num_bytes = calcu_metadata_size(rc, node, 1) * 2; | |
5d4f98a2 | 2651 | |
3fd0a558 | 2652 | trans->block_rsv = rc->block_rsv; |
0647bf56 | 2653 | rc->reserved_bytes += num_bytes; |
8ca17f0f JB |
2654 | |
2655 | /* | |
2656 | * We are under a transaction here so we can only do limited flushing. | |
2657 | * If we get an enospc just kick back -EAGAIN so we know to drop the | |
2658 | * transaction and try to refill when we can flush all the things. | |
2659 | */ | |
0647bf56 | 2660 | ret = btrfs_block_rsv_refill(root, rc->block_rsv, num_bytes, |
8ca17f0f | 2661 | BTRFS_RESERVE_FLUSH_LIMIT); |
3fd0a558 | 2662 | if (ret) { |
da17066c | 2663 | tmp = fs_info->nodesize * RELOCATION_RESERVED_NODES; |
8ca17f0f JB |
2664 | while (tmp <= rc->reserved_bytes) |
2665 | tmp <<= 1; | |
2666 | /* | |
2667 | * only one thread can access block_rsv at this point, | |
2668 | * so we don't need hold lock to protect block_rsv. | |
2669 | * we expand more reservation size here to allow enough | |
2670 | * space for relocation and we will return eailer in | |
2671 | * enospc case. | |
2672 | */ | |
da17066c JM |
2673 | rc->block_rsv->size = tmp + fs_info->nodesize * |
2674 | RELOCATION_RESERVED_NODES; | |
8ca17f0f | 2675 | return -EAGAIN; |
5d4f98a2 | 2676 | } |
3fd0a558 | 2677 | |
3fd0a558 YZ |
2678 | return 0; |
2679 | } | |
2680 | ||
5d4f98a2 YZ |
2681 | /* |
2682 | * relocate a block tree, and then update pointers in upper level | |
2683 | * blocks that reference the block to point to the new location. | |
2684 | * | |
2685 | * if called by link_to_upper, the block has already been relocated. | |
2686 | * in that case this function just updates pointers. | |
2687 | */ | |
2688 | static int do_relocation(struct btrfs_trans_handle *trans, | |
3fd0a558 | 2689 | struct reloc_control *rc, |
5d4f98a2 YZ |
2690 | struct backref_node *node, |
2691 | struct btrfs_key *key, | |
2692 | struct btrfs_path *path, int lowest) | |
2693 | { | |
2ff7e61e | 2694 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 YZ |
2695 | struct backref_node *upper; |
2696 | struct backref_edge *edge; | |
2697 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; | |
2698 | struct btrfs_root *root; | |
2699 | struct extent_buffer *eb; | |
2700 | u32 blocksize; | |
2701 | u64 bytenr; | |
2702 | u64 generation; | |
5d4f98a2 YZ |
2703 | int slot; |
2704 | int ret; | |
2705 | int err = 0; | |
2706 | ||
2707 | BUG_ON(lowest && node->eb); | |
2708 | ||
2709 | path->lowest_level = node->level + 1; | |
3fd0a558 | 2710 | rc->backref_cache.path[node->level] = node; |
5d4f98a2 | 2711 | list_for_each_entry(edge, &node->upper, list[LOWER]) { |
581c1760 QW |
2712 | struct btrfs_key first_key; |
2713 | ||
5d4f98a2 | 2714 | cond_resched(); |
5d4f98a2 YZ |
2715 | |
2716 | upper = edge->node[UPPER]; | |
dc4103f9 | 2717 | root = select_reloc_root(trans, rc, upper, edges); |
3fd0a558 YZ |
2718 | BUG_ON(!root); |
2719 | ||
2720 | if (upper->eb && !upper->locked) { | |
2721 | if (!lowest) { | |
2722 | ret = btrfs_bin_search(upper->eb, key, | |
2723 | upper->level, &slot); | |
2724 | BUG_ON(ret); | |
2725 | bytenr = btrfs_node_blockptr(upper->eb, slot); | |
2726 | if (node->eb->start == bytenr) | |
2727 | goto next; | |
2728 | } | |
5d4f98a2 | 2729 | drop_node_buffer(upper); |
3fd0a558 | 2730 | } |
5d4f98a2 YZ |
2731 | |
2732 | if (!upper->eb) { | |
2733 | ret = btrfs_search_slot(trans, root, key, path, 0, 1); | |
3561b9db LB |
2734 | if (ret) { |
2735 | if (ret < 0) | |
2736 | err = ret; | |
2737 | else | |
2738 | err = -ENOENT; | |
2739 | ||
2740 | btrfs_release_path(path); | |
5d4f98a2 YZ |
2741 | break; |
2742 | } | |
5d4f98a2 | 2743 | |
3fd0a558 YZ |
2744 | if (!upper->eb) { |
2745 | upper->eb = path->nodes[upper->level]; | |
2746 | path->nodes[upper->level] = NULL; | |
2747 | } else { | |
2748 | BUG_ON(upper->eb != path->nodes[upper->level]); | |
2749 | } | |
5d4f98a2 | 2750 | |
3fd0a558 YZ |
2751 | upper->locked = 1; |
2752 | path->locks[upper->level] = 0; | |
5d4f98a2 | 2753 | |
3fd0a558 | 2754 | slot = path->slots[upper->level]; |
b3b4aa74 | 2755 | btrfs_release_path(path); |
5d4f98a2 YZ |
2756 | } else { |
2757 | ret = btrfs_bin_search(upper->eb, key, upper->level, | |
2758 | &slot); | |
2759 | BUG_ON(ret); | |
2760 | } | |
2761 | ||
2762 | bytenr = btrfs_node_blockptr(upper->eb, slot); | |
3fd0a558 | 2763 | if (lowest) { |
4547f4d8 LB |
2764 | if (bytenr != node->bytenr) { |
2765 | btrfs_err(root->fs_info, | |
2766 | "lowest leaf/node mismatch: bytenr %llu node->bytenr %llu slot %d upper %llu", | |
2767 | bytenr, node->bytenr, slot, | |
2768 | upper->eb->start); | |
2769 | err = -EIO; | |
2770 | goto next; | |
2771 | } | |
5d4f98a2 | 2772 | } else { |
3fd0a558 YZ |
2773 | if (node->eb->start == bytenr) |
2774 | goto next; | |
5d4f98a2 YZ |
2775 | } |
2776 | ||
da17066c | 2777 | blocksize = root->fs_info->nodesize; |
5d4f98a2 | 2778 | generation = btrfs_node_ptr_generation(upper->eb, slot); |
581c1760 QW |
2779 | btrfs_node_key_to_cpu(upper->eb, &first_key, slot); |
2780 | eb = read_tree_block(fs_info, bytenr, generation, | |
2781 | upper->level - 1, &first_key); | |
64c043de LB |
2782 | if (IS_ERR(eb)) { |
2783 | err = PTR_ERR(eb); | |
2784 | goto next; | |
2785 | } else if (!extent_buffer_uptodate(eb)) { | |
416bc658 | 2786 | free_extent_buffer(eb); |
97d9a8a4 TI |
2787 | err = -EIO; |
2788 | goto next; | |
2789 | } | |
5d4f98a2 YZ |
2790 | btrfs_tree_lock(eb); |
2791 | btrfs_set_lock_blocking(eb); | |
2792 | ||
2793 | if (!node->eb) { | |
2794 | ret = btrfs_cow_block(trans, root, eb, upper->eb, | |
2795 | slot, &eb); | |
3fd0a558 YZ |
2796 | btrfs_tree_unlock(eb); |
2797 | free_extent_buffer(eb); | |
5d4f98a2 YZ |
2798 | if (ret < 0) { |
2799 | err = ret; | |
3fd0a558 | 2800 | goto next; |
5d4f98a2 | 2801 | } |
3fd0a558 | 2802 | BUG_ON(node->eb != eb); |
5d4f98a2 YZ |
2803 | } else { |
2804 | btrfs_set_node_blockptr(upper->eb, slot, | |
2805 | node->eb->start); | |
2806 | btrfs_set_node_ptr_generation(upper->eb, slot, | |
2807 | trans->transid); | |
2808 | btrfs_mark_buffer_dirty(upper->eb); | |
2809 | ||
84f7d8e6 | 2810 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2811 | node->eb->start, blocksize, |
2812 | upper->eb->start, | |
2813 | btrfs_header_owner(upper->eb), | |
b06c4bf5 | 2814 | node->level, 0); |
5d4f98a2 YZ |
2815 | BUG_ON(ret); |
2816 | ||
2817 | ret = btrfs_drop_subtree(trans, root, eb, upper->eb); | |
2818 | BUG_ON(ret); | |
5d4f98a2 | 2819 | } |
3fd0a558 YZ |
2820 | next: |
2821 | if (!upper->pending) | |
2822 | drop_node_buffer(upper); | |
2823 | else | |
2824 | unlock_node_buffer(upper); | |
2825 | if (err) | |
2826 | break; | |
5d4f98a2 | 2827 | } |
3fd0a558 YZ |
2828 | |
2829 | if (!err && node->pending) { | |
2830 | drop_node_buffer(node); | |
2831 | list_move_tail(&node->list, &rc->backref_cache.changed); | |
2832 | node->pending = 0; | |
2833 | } | |
2834 | ||
5d4f98a2 | 2835 | path->lowest_level = 0; |
3fd0a558 | 2836 | BUG_ON(err == -ENOSPC); |
5d4f98a2 YZ |
2837 | return err; |
2838 | } | |
2839 | ||
2840 | static int link_to_upper(struct btrfs_trans_handle *trans, | |
3fd0a558 | 2841 | struct reloc_control *rc, |
5d4f98a2 YZ |
2842 | struct backref_node *node, |
2843 | struct btrfs_path *path) | |
2844 | { | |
2845 | struct btrfs_key key; | |
5d4f98a2 YZ |
2846 | |
2847 | btrfs_node_key_to_cpu(node->eb, &key, 0); | |
3fd0a558 | 2848 | return do_relocation(trans, rc, node, &key, path, 0); |
5d4f98a2 YZ |
2849 | } |
2850 | ||
2851 | static int finish_pending_nodes(struct btrfs_trans_handle *trans, | |
3fd0a558 YZ |
2852 | struct reloc_control *rc, |
2853 | struct btrfs_path *path, int err) | |
5d4f98a2 | 2854 | { |
3fd0a558 YZ |
2855 | LIST_HEAD(list); |
2856 | struct backref_cache *cache = &rc->backref_cache; | |
5d4f98a2 YZ |
2857 | struct backref_node *node; |
2858 | int level; | |
2859 | int ret; | |
5d4f98a2 YZ |
2860 | |
2861 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { | |
2862 | while (!list_empty(&cache->pending[level])) { | |
2863 | node = list_entry(cache->pending[level].next, | |
3fd0a558 YZ |
2864 | struct backref_node, list); |
2865 | list_move_tail(&node->list, &list); | |
2866 | BUG_ON(!node->pending); | |
5d4f98a2 | 2867 | |
3fd0a558 YZ |
2868 | if (!err) { |
2869 | ret = link_to_upper(trans, rc, node, path); | |
2870 | if (ret < 0) | |
2871 | err = ret; | |
2872 | } | |
5d4f98a2 | 2873 | } |
3fd0a558 | 2874 | list_splice_init(&list, &cache->pending[level]); |
5d4f98a2 | 2875 | } |
5d4f98a2 YZ |
2876 | return err; |
2877 | } | |
2878 | ||
2879 | static void mark_block_processed(struct reloc_control *rc, | |
3fd0a558 YZ |
2880 | u64 bytenr, u32 blocksize) |
2881 | { | |
2882 | set_extent_bits(&rc->processed_blocks, bytenr, bytenr + blocksize - 1, | |
ceeb0ae7 | 2883 | EXTENT_DIRTY); |
3fd0a558 YZ |
2884 | } |
2885 | ||
2886 | static void __mark_block_processed(struct reloc_control *rc, | |
2887 | struct backref_node *node) | |
5d4f98a2 YZ |
2888 | { |
2889 | u32 blocksize; | |
2890 | if (node->level == 0 || | |
2891 | in_block_group(node->bytenr, rc->block_group)) { | |
da17066c | 2892 | blocksize = rc->extent_root->fs_info->nodesize; |
3fd0a558 | 2893 | mark_block_processed(rc, node->bytenr, blocksize); |
5d4f98a2 YZ |
2894 | } |
2895 | node->processed = 1; | |
2896 | } | |
2897 | ||
2898 | /* | |
2899 | * mark a block and all blocks directly/indirectly reference the block | |
2900 | * as processed. | |
2901 | */ | |
2902 | static void update_processed_blocks(struct reloc_control *rc, | |
2903 | struct backref_node *node) | |
2904 | { | |
2905 | struct backref_node *next = node; | |
2906 | struct backref_edge *edge; | |
2907 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; | |
2908 | int index = 0; | |
2909 | ||
2910 | while (next) { | |
2911 | cond_resched(); | |
2912 | while (1) { | |
2913 | if (next->processed) | |
2914 | break; | |
2915 | ||
3fd0a558 | 2916 | __mark_block_processed(rc, next); |
5d4f98a2 YZ |
2917 | |
2918 | if (list_empty(&next->upper)) | |
2919 | break; | |
2920 | ||
2921 | edge = list_entry(next->upper.next, | |
2922 | struct backref_edge, list[LOWER]); | |
2923 | edges[index++] = edge; | |
2924 | next = edge->node[UPPER]; | |
2925 | } | |
2926 | next = walk_down_backref(edges, &index); | |
2927 | } | |
2928 | } | |
2929 | ||
7476dfda | 2930 | static int tree_block_processed(u64 bytenr, struct reloc_control *rc) |
3fd0a558 | 2931 | { |
da17066c | 2932 | u32 blocksize = rc->extent_root->fs_info->nodesize; |
7476dfda | 2933 | |
3fd0a558 YZ |
2934 | if (test_range_bit(&rc->processed_blocks, bytenr, |
2935 | bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL)) | |
2936 | return 1; | |
2937 | return 0; | |
5d4f98a2 YZ |
2938 | } |
2939 | ||
2ff7e61e | 2940 | static int get_tree_block_key(struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
2941 | struct tree_block *block) |
2942 | { | |
2943 | struct extent_buffer *eb; | |
2944 | ||
2945 | BUG_ON(block->key_ready); | |
581c1760 QW |
2946 | eb = read_tree_block(fs_info, block->bytenr, block->key.offset, |
2947 | block->level, NULL); | |
64c043de LB |
2948 | if (IS_ERR(eb)) { |
2949 | return PTR_ERR(eb); | |
2950 | } else if (!extent_buffer_uptodate(eb)) { | |
416bc658 JB |
2951 | free_extent_buffer(eb); |
2952 | return -EIO; | |
2953 | } | |
5d4f98a2 YZ |
2954 | WARN_ON(btrfs_header_level(eb) != block->level); |
2955 | if (block->level == 0) | |
2956 | btrfs_item_key_to_cpu(eb, &block->key, 0); | |
2957 | else | |
2958 | btrfs_node_key_to_cpu(eb, &block->key, 0); | |
2959 | free_extent_buffer(eb); | |
2960 | block->key_ready = 1; | |
2961 | return 0; | |
2962 | } | |
2963 | ||
5d4f98a2 YZ |
2964 | /* |
2965 | * helper function to relocate a tree block | |
2966 | */ | |
2967 | static int relocate_tree_block(struct btrfs_trans_handle *trans, | |
2968 | struct reloc_control *rc, | |
2969 | struct backref_node *node, | |
2970 | struct btrfs_key *key, | |
2971 | struct btrfs_path *path) | |
2972 | { | |
2973 | struct btrfs_root *root; | |
3fd0a558 YZ |
2974 | int ret = 0; |
2975 | ||
2976 | if (!node) | |
2977 | return 0; | |
5d4f98a2 | 2978 | |
3fd0a558 | 2979 | BUG_ON(node->processed); |
147d256e | 2980 | root = select_one_root(node); |
3fd0a558 | 2981 | if (root == ERR_PTR(-ENOENT)) { |
5d4f98a2 | 2982 | update_processed_blocks(rc, node); |
3fd0a558 | 2983 | goto out; |
5d4f98a2 YZ |
2984 | } |
2985 | ||
27cdeb70 | 2986 | if (!root || test_bit(BTRFS_ROOT_REF_COWS, &root->state)) { |
3fd0a558 YZ |
2987 | ret = reserve_metadata_space(trans, rc, node); |
2988 | if (ret) | |
5d4f98a2 | 2989 | goto out; |
5d4f98a2 YZ |
2990 | } |
2991 | ||
3fd0a558 | 2992 | if (root) { |
27cdeb70 | 2993 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) { |
3fd0a558 YZ |
2994 | BUG_ON(node->new_bytenr); |
2995 | BUG_ON(!list_empty(&node->list)); | |
2996 | btrfs_record_root_in_trans(trans, root); | |
2997 | root = root->reloc_root; | |
2998 | node->new_bytenr = root->node->start; | |
2999 | node->root = root; | |
3000 | list_add_tail(&node->list, &rc->backref_cache.changed); | |
3001 | } else { | |
3002 | path->lowest_level = node->level; | |
3003 | ret = btrfs_search_slot(trans, root, key, path, 0, 1); | |
b3b4aa74 | 3004 | btrfs_release_path(path); |
3fd0a558 YZ |
3005 | if (ret > 0) |
3006 | ret = 0; | |
3007 | } | |
3008 | if (!ret) | |
3009 | update_processed_blocks(rc, node); | |
3010 | } else { | |
3011 | ret = do_relocation(trans, rc, node, key, path, 1); | |
3012 | } | |
5d4f98a2 | 3013 | out: |
0647bf56 | 3014 | if (ret || node->level == 0 || node->cowonly) |
3fd0a558 | 3015 | remove_backref_node(&rc->backref_cache, node); |
5d4f98a2 YZ |
3016 | return ret; |
3017 | } | |
3018 | ||
3019 | /* | |
3020 | * relocate a list of blocks | |
3021 | */ | |
3022 | static noinline_for_stack | |
3023 | int relocate_tree_blocks(struct btrfs_trans_handle *trans, | |
3024 | struct reloc_control *rc, struct rb_root *blocks) | |
3025 | { | |
2ff7e61e | 3026 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 YZ |
3027 | struct backref_node *node; |
3028 | struct btrfs_path *path; | |
3029 | struct tree_block *block; | |
3030 | struct rb_node *rb_node; | |
5d4f98a2 YZ |
3031 | int ret; |
3032 | int err = 0; | |
3033 | ||
3034 | path = btrfs_alloc_path(); | |
e1a12670 LB |
3035 | if (!path) { |
3036 | err = -ENOMEM; | |
34c2b290 | 3037 | goto out_free_blocks; |
e1a12670 | 3038 | } |
5d4f98a2 | 3039 | |
5d4f98a2 YZ |
3040 | rb_node = rb_first(blocks); |
3041 | while (rb_node) { | |
3042 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
5d4f98a2 | 3043 | if (!block->key_ready) |
2ff7e61e | 3044 | readahead_tree_block(fs_info, block->bytenr); |
5d4f98a2 YZ |
3045 | rb_node = rb_next(rb_node); |
3046 | } | |
3047 | ||
3048 | rb_node = rb_first(blocks); | |
3049 | while (rb_node) { | |
3050 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
34c2b290 | 3051 | if (!block->key_ready) { |
2ff7e61e | 3052 | err = get_tree_block_key(fs_info, block); |
34c2b290 DS |
3053 | if (err) |
3054 | goto out_free_path; | |
3055 | } | |
5d4f98a2 YZ |
3056 | rb_node = rb_next(rb_node); |
3057 | } | |
3058 | ||
3059 | rb_node = rb_first(blocks); | |
3060 | while (rb_node) { | |
3061 | block = rb_entry(rb_node, struct tree_block, rb_node); | |
3062 | ||
3fd0a558 | 3063 | node = build_backref_tree(rc, &block->key, |
5d4f98a2 YZ |
3064 | block->level, block->bytenr); |
3065 | if (IS_ERR(node)) { | |
3066 | err = PTR_ERR(node); | |
3067 | goto out; | |
3068 | } | |
3069 | ||
3070 | ret = relocate_tree_block(trans, rc, node, &block->key, | |
3071 | path); | |
3072 | if (ret < 0) { | |
3fd0a558 YZ |
3073 | if (ret != -EAGAIN || rb_node == rb_first(blocks)) |
3074 | err = ret; | |
5d4f98a2 YZ |
3075 | goto out; |
3076 | } | |
5d4f98a2 YZ |
3077 | rb_node = rb_next(rb_node); |
3078 | } | |
5d4f98a2 | 3079 | out: |
3fd0a558 | 3080 | err = finish_pending_nodes(trans, rc, path, err); |
5d4f98a2 | 3081 | |
34c2b290 | 3082 | out_free_path: |
5d4f98a2 | 3083 | btrfs_free_path(path); |
34c2b290 | 3084 | out_free_blocks: |
e1a12670 | 3085 | free_block_list(blocks); |
5d4f98a2 YZ |
3086 | return err; |
3087 | } | |
3088 | ||
efa56464 YZ |
3089 | static noinline_for_stack |
3090 | int prealloc_file_extent_cluster(struct inode *inode, | |
3091 | struct file_extent_cluster *cluster) | |
3092 | { | |
3093 | u64 alloc_hint = 0; | |
3094 | u64 start; | |
3095 | u64 end; | |
3096 | u64 offset = BTRFS_I(inode)->index_cnt; | |
3097 | u64 num_bytes; | |
3098 | int nr = 0; | |
3099 | int ret = 0; | |
dcb40c19 WX |
3100 | u64 prealloc_start = cluster->start - offset; |
3101 | u64 prealloc_end = cluster->end - offset; | |
18513091 | 3102 | u64 cur_offset; |
364ecf36 | 3103 | struct extent_changeset *data_reserved = NULL; |
efa56464 YZ |
3104 | |
3105 | BUG_ON(cluster->start != cluster->boundary[0]); | |
5955102c | 3106 | inode_lock(inode); |
efa56464 | 3107 | |
364ecf36 | 3108 | ret = btrfs_check_data_free_space(inode, &data_reserved, prealloc_start, |
dcb40c19 | 3109 | prealloc_end + 1 - prealloc_start); |
efa56464 YZ |
3110 | if (ret) |
3111 | goto out; | |
3112 | ||
18513091 | 3113 | cur_offset = prealloc_start; |
efa56464 YZ |
3114 | while (nr < cluster->nr) { |
3115 | start = cluster->boundary[nr] - offset; | |
3116 | if (nr + 1 < cluster->nr) | |
3117 | end = cluster->boundary[nr + 1] - 1 - offset; | |
3118 | else | |
3119 | end = cluster->end - offset; | |
3120 | ||
d0082371 | 3121 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
efa56464 | 3122 | num_bytes = end + 1 - start; |
18513091 | 3123 | if (cur_offset < start) |
bc42bda2 QW |
3124 | btrfs_free_reserved_data_space(inode, data_reserved, |
3125 | cur_offset, start - cur_offset); | |
efa56464 YZ |
3126 | ret = btrfs_prealloc_file_range(inode, 0, start, |
3127 | num_bytes, num_bytes, | |
3128 | end + 1, &alloc_hint); | |
18513091 | 3129 | cur_offset = end + 1; |
d0082371 | 3130 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
efa56464 YZ |
3131 | if (ret) |
3132 | break; | |
3133 | nr++; | |
3134 | } | |
18513091 | 3135 | if (cur_offset < prealloc_end) |
bc42bda2 QW |
3136 | btrfs_free_reserved_data_space(inode, data_reserved, |
3137 | cur_offset, prealloc_end + 1 - cur_offset); | |
efa56464 | 3138 | out: |
5955102c | 3139 | inode_unlock(inode); |
364ecf36 | 3140 | extent_changeset_free(data_reserved); |
efa56464 YZ |
3141 | return ret; |
3142 | } | |
3143 | ||
5d4f98a2 | 3144 | static noinline_for_stack |
0257bb82 YZ |
3145 | int setup_extent_mapping(struct inode *inode, u64 start, u64 end, |
3146 | u64 block_start) | |
3147 | { | |
0b246afa | 3148 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
0257bb82 YZ |
3149 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
3150 | struct extent_map *em; | |
3151 | int ret = 0; | |
3152 | ||
172ddd60 | 3153 | em = alloc_extent_map(); |
0257bb82 YZ |
3154 | if (!em) |
3155 | return -ENOMEM; | |
3156 | ||
3157 | em->start = start; | |
3158 | em->len = end + 1 - start; | |
3159 | em->block_len = em->len; | |
3160 | em->block_start = block_start; | |
0b246afa | 3161 | em->bdev = fs_info->fs_devices->latest_bdev; |
0257bb82 YZ |
3162 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
3163 | ||
d0082371 | 3164 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
0257bb82 YZ |
3165 | while (1) { |
3166 | write_lock(&em_tree->lock); | |
09a2a8f9 | 3167 | ret = add_extent_mapping(em_tree, em, 0); |
0257bb82 YZ |
3168 | write_unlock(&em_tree->lock); |
3169 | if (ret != -EEXIST) { | |
3170 | free_extent_map(em); | |
3171 | break; | |
3172 | } | |
dcdbc059 | 3173 | btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 0); |
0257bb82 | 3174 | } |
d0082371 | 3175 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
0257bb82 YZ |
3176 | return ret; |
3177 | } | |
3178 | ||
3179 | static int relocate_file_extent_cluster(struct inode *inode, | |
3180 | struct file_extent_cluster *cluster) | |
5d4f98a2 | 3181 | { |
2ff7e61e | 3182 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
5d4f98a2 YZ |
3183 | u64 page_start; |
3184 | u64 page_end; | |
0257bb82 YZ |
3185 | u64 offset = BTRFS_I(inode)->index_cnt; |
3186 | unsigned long index; | |
5d4f98a2 | 3187 | unsigned long last_index; |
5d4f98a2 YZ |
3188 | struct page *page; |
3189 | struct file_ra_state *ra; | |
3b16a4e3 | 3190 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
0257bb82 | 3191 | int nr = 0; |
5d4f98a2 YZ |
3192 | int ret = 0; |
3193 | ||
0257bb82 YZ |
3194 | if (!cluster->nr) |
3195 | return 0; | |
3196 | ||
5d4f98a2 YZ |
3197 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
3198 | if (!ra) | |
3199 | return -ENOMEM; | |
3200 | ||
efa56464 YZ |
3201 | ret = prealloc_file_extent_cluster(inode, cluster); |
3202 | if (ret) | |
3203 | goto out; | |
0257bb82 | 3204 | |
efa56464 | 3205 | file_ra_state_init(ra, inode->i_mapping); |
5d4f98a2 | 3206 | |
0257bb82 YZ |
3207 | ret = setup_extent_mapping(inode, cluster->start - offset, |
3208 | cluster->end - offset, cluster->start); | |
5d4f98a2 | 3209 | if (ret) |
efa56464 | 3210 | goto out; |
5d4f98a2 | 3211 | |
09cbfeaf KS |
3212 | index = (cluster->start - offset) >> PAGE_SHIFT; |
3213 | last_index = (cluster->end - offset) >> PAGE_SHIFT; | |
0257bb82 | 3214 | while (index <= last_index) { |
9f3db423 NB |
3215 | ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), |
3216 | PAGE_SIZE); | |
efa56464 YZ |
3217 | if (ret) |
3218 | goto out; | |
3219 | ||
0257bb82 | 3220 | page = find_lock_page(inode->i_mapping, index); |
5d4f98a2 | 3221 | if (!page) { |
0257bb82 YZ |
3222 | page_cache_sync_readahead(inode->i_mapping, |
3223 | ra, NULL, index, | |
3224 | last_index + 1 - index); | |
a94733d0 | 3225 | page = find_or_create_page(inode->i_mapping, index, |
3b16a4e3 | 3226 | mask); |
0257bb82 | 3227 | if (!page) { |
691fa059 | 3228 | btrfs_delalloc_release_metadata(BTRFS_I(inode), |
43b18595 | 3229 | PAGE_SIZE, true); |
0257bb82 | 3230 | ret = -ENOMEM; |
efa56464 | 3231 | goto out; |
0257bb82 | 3232 | } |
5d4f98a2 | 3233 | } |
0257bb82 YZ |
3234 | |
3235 | if (PageReadahead(page)) { | |
3236 | page_cache_async_readahead(inode->i_mapping, | |
3237 | ra, NULL, page, index, | |
3238 | last_index + 1 - index); | |
3239 | } | |
3240 | ||
5d4f98a2 YZ |
3241 | if (!PageUptodate(page)) { |
3242 | btrfs_readpage(NULL, page); | |
3243 | lock_page(page); | |
3244 | if (!PageUptodate(page)) { | |
3245 | unlock_page(page); | |
09cbfeaf | 3246 | put_page(page); |
691fa059 | 3247 | btrfs_delalloc_release_metadata(BTRFS_I(inode), |
43b18595 | 3248 | PAGE_SIZE, true); |
8b62f87b | 3249 | btrfs_delalloc_release_extents(BTRFS_I(inode), |
43b18595 | 3250 | PAGE_SIZE, true); |
5d4f98a2 | 3251 | ret = -EIO; |
efa56464 | 3252 | goto out; |
5d4f98a2 YZ |
3253 | } |
3254 | } | |
5d4f98a2 | 3255 | |
4eee4fa4 | 3256 | page_start = page_offset(page); |
09cbfeaf | 3257 | page_end = page_start + PAGE_SIZE - 1; |
0257bb82 | 3258 | |
d0082371 | 3259 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); |
0257bb82 | 3260 | |
5d4f98a2 YZ |
3261 | set_page_extent_mapped(page); |
3262 | ||
0257bb82 YZ |
3263 | if (nr < cluster->nr && |
3264 | page_start + offset == cluster->boundary[nr]) { | |
3265 | set_extent_bits(&BTRFS_I(inode)->io_tree, | |
3266 | page_start, page_end, | |
ceeb0ae7 | 3267 | EXTENT_BOUNDARY); |
0257bb82 YZ |
3268 | nr++; |
3269 | } | |
5d4f98a2 | 3270 | |
765f3ceb NB |
3271 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, 0, |
3272 | NULL, 0); | |
3273 | if (ret) { | |
3274 | unlock_page(page); | |
3275 | put_page(page); | |
3276 | btrfs_delalloc_release_metadata(BTRFS_I(inode), | |
43b18595 | 3277 | PAGE_SIZE, true); |
765f3ceb | 3278 | btrfs_delalloc_release_extents(BTRFS_I(inode), |
43b18595 | 3279 | PAGE_SIZE, true); |
765f3ceb NB |
3280 | |
3281 | clear_extent_bits(&BTRFS_I(inode)->io_tree, | |
3282 | page_start, page_end, | |
3283 | EXTENT_LOCKED | EXTENT_BOUNDARY); | |
3284 | goto out; | |
3285 | ||
3286 | } | |
5d4f98a2 | 3287 | set_page_dirty(page); |
5d4f98a2 | 3288 | |
0257bb82 | 3289 | unlock_extent(&BTRFS_I(inode)->io_tree, |
d0082371 | 3290 | page_start, page_end); |
5d4f98a2 | 3291 | unlock_page(page); |
09cbfeaf | 3292 | put_page(page); |
0257bb82 YZ |
3293 | |
3294 | index++; | |
43b18595 QW |
3295 | btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE, |
3296 | false); | |
efa56464 | 3297 | balance_dirty_pages_ratelimited(inode->i_mapping); |
2ff7e61e | 3298 | btrfs_throttle(fs_info); |
5d4f98a2 | 3299 | } |
0257bb82 | 3300 | WARN_ON(nr != cluster->nr); |
efa56464 | 3301 | out: |
5d4f98a2 | 3302 | kfree(ra); |
5d4f98a2 YZ |
3303 | return ret; |
3304 | } | |
3305 | ||
3306 | static noinline_for_stack | |
0257bb82 YZ |
3307 | int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key, |
3308 | struct file_extent_cluster *cluster) | |
5d4f98a2 | 3309 | { |
0257bb82 | 3310 | int ret; |
5d4f98a2 | 3311 | |
0257bb82 YZ |
3312 | if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) { |
3313 | ret = relocate_file_extent_cluster(inode, cluster); | |
3314 | if (ret) | |
3315 | return ret; | |
3316 | cluster->nr = 0; | |
5d4f98a2 | 3317 | } |
5d4f98a2 | 3318 | |
0257bb82 YZ |
3319 | if (!cluster->nr) |
3320 | cluster->start = extent_key->objectid; | |
3321 | else | |
3322 | BUG_ON(cluster->nr >= MAX_EXTENTS); | |
3323 | cluster->end = extent_key->objectid + extent_key->offset - 1; | |
3324 | cluster->boundary[cluster->nr] = extent_key->objectid; | |
3325 | cluster->nr++; | |
3326 | ||
3327 | if (cluster->nr >= MAX_EXTENTS) { | |
3328 | ret = relocate_file_extent_cluster(inode, cluster); | |
3329 | if (ret) | |
3330 | return ret; | |
3331 | cluster->nr = 0; | |
3332 | } | |
3333 | return 0; | |
5d4f98a2 YZ |
3334 | } |
3335 | ||
3336 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3337 | static int get_ref_objectid_v0(struct reloc_control *rc, | |
3338 | struct btrfs_path *path, | |
3339 | struct btrfs_key *extent_key, | |
3340 | u64 *ref_objectid, int *path_change) | |
3341 | { | |
3342 | struct btrfs_key key; | |
3343 | struct extent_buffer *leaf; | |
3344 | struct btrfs_extent_ref_v0 *ref0; | |
3345 | int ret; | |
3346 | int slot; | |
3347 | ||
3348 | leaf = path->nodes[0]; | |
3349 | slot = path->slots[0]; | |
3350 | while (1) { | |
3351 | if (slot >= btrfs_header_nritems(leaf)) { | |
3352 | ret = btrfs_next_leaf(rc->extent_root, path); | |
3353 | if (ret < 0) | |
3354 | return ret; | |
3355 | BUG_ON(ret > 0); | |
3356 | leaf = path->nodes[0]; | |
3357 | slot = path->slots[0]; | |
3358 | if (path_change) | |
3359 | *path_change = 1; | |
3360 | } | |
3361 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
3362 | if (key.objectid != extent_key->objectid) | |
3363 | return -ENOENT; | |
3364 | ||
3365 | if (key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
3366 | slot++; | |
3367 | continue; | |
3368 | } | |
3369 | ref0 = btrfs_item_ptr(leaf, slot, | |
3370 | struct btrfs_extent_ref_v0); | |
3371 | *ref_objectid = btrfs_ref_objectid_v0(leaf, ref0); | |
3372 | break; | |
3373 | } | |
3374 | return 0; | |
3375 | } | |
3376 | #endif | |
3377 | ||
3378 | /* | |
3379 | * helper to add a tree block to the list. | |
3380 | * the major work is getting the generation and level of the block | |
3381 | */ | |
3382 | static int add_tree_block(struct reloc_control *rc, | |
3383 | struct btrfs_key *extent_key, | |
3384 | struct btrfs_path *path, | |
3385 | struct rb_root *blocks) | |
3386 | { | |
3387 | struct extent_buffer *eb; | |
3388 | struct btrfs_extent_item *ei; | |
3389 | struct btrfs_tree_block_info *bi; | |
3390 | struct tree_block *block; | |
3391 | struct rb_node *rb_node; | |
3392 | u32 item_size; | |
3393 | int level = -1; | |
7fdf4b60 | 3394 | u64 generation; |
5d4f98a2 YZ |
3395 | |
3396 | eb = path->nodes[0]; | |
3397 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
3398 | ||
3173a18f JB |
3399 | if (extent_key->type == BTRFS_METADATA_ITEM_KEY || |
3400 | item_size >= sizeof(*ei) + sizeof(*bi)) { | |
5d4f98a2 YZ |
3401 | ei = btrfs_item_ptr(eb, path->slots[0], |
3402 | struct btrfs_extent_item); | |
3173a18f JB |
3403 | if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) { |
3404 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
3405 | level = btrfs_tree_block_level(eb, bi); | |
3406 | } else { | |
3407 | level = (int)extent_key->offset; | |
3408 | } | |
5d4f98a2 | 3409 | generation = btrfs_extent_generation(eb, ei); |
5d4f98a2 YZ |
3410 | } else { |
3411 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3412 | u64 ref_owner; | |
3413 | int ret; | |
3414 | ||
3415 | BUG_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
3416 | ret = get_ref_objectid_v0(rc, path, extent_key, | |
3417 | &ref_owner, NULL); | |
411fc6bc AK |
3418 | if (ret < 0) |
3419 | return ret; | |
5d4f98a2 YZ |
3420 | BUG_ON(ref_owner >= BTRFS_MAX_LEVEL); |
3421 | level = (int)ref_owner; | |
3422 | /* FIXME: get real generation */ | |
3423 | generation = 0; | |
3424 | #else | |
3425 | BUG(); | |
3426 | #endif | |
3427 | } | |
3428 | ||
b3b4aa74 | 3429 | btrfs_release_path(path); |
5d4f98a2 YZ |
3430 | |
3431 | BUG_ON(level == -1); | |
3432 | ||
3433 | block = kmalloc(sizeof(*block), GFP_NOFS); | |
3434 | if (!block) | |
3435 | return -ENOMEM; | |
3436 | ||
3437 | block->bytenr = extent_key->objectid; | |
da17066c | 3438 | block->key.objectid = rc->extent_root->fs_info->nodesize; |
5d4f98a2 YZ |
3439 | block->key.offset = generation; |
3440 | block->level = level; | |
3441 | block->key_ready = 0; | |
3442 | ||
3443 | rb_node = tree_insert(blocks, block->bytenr, &block->rb_node); | |
43c04fb1 JM |
3444 | if (rb_node) |
3445 | backref_tree_panic(rb_node, -EEXIST, block->bytenr); | |
5d4f98a2 YZ |
3446 | |
3447 | return 0; | |
3448 | } | |
3449 | ||
3450 | /* | |
3451 | * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY | |
3452 | */ | |
3453 | static int __add_tree_block(struct reloc_control *rc, | |
3454 | u64 bytenr, u32 blocksize, | |
3455 | struct rb_root *blocks) | |
3456 | { | |
0b246afa | 3457 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 YZ |
3458 | struct btrfs_path *path; |
3459 | struct btrfs_key key; | |
3460 | int ret; | |
0b246afa | 3461 | bool skinny = btrfs_fs_incompat(fs_info, SKINNY_METADATA); |
5d4f98a2 | 3462 | |
7476dfda | 3463 | if (tree_block_processed(bytenr, rc)) |
5d4f98a2 YZ |
3464 | return 0; |
3465 | ||
3466 | if (tree_search(blocks, bytenr)) | |
3467 | return 0; | |
3468 | ||
3469 | path = btrfs_alloc_path(); | |
3470 | if (!path) | |
3471 | return -ENOMEM; | |
aee68ee5 | 3472 | again: |
5d4f98a2 | 3473 | key.objectid = bytenr; |
aee68ee5 JB |
3474 | if (skinny) { |
3475 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3476 | key.offset = (u64)-1; | |
3477 | } else { | |
3478 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3479 | key.offset = blocksize; | |
3480 | } | |
5d4f98a2 YZ |
3481 | |
3482 | path->search_commit_root = 1; | |
3483 | path->skip_locking = 1; | |
3484 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); | |
3485 | if (ret < 0) | |
3486 | goto out; | |
5d4f98a2 | 3487 | |
aee68ee5 JB |
3488 | if (ret > 0 && skinny) { |
3489 | if (path->slots[0]) { | |
3490 | path->slots[0]--; | |
3491 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3492 | path->slots[0]); | |
3493 | if (key.objectid == bytenr && | |
3494 | (key.type == BTRFS_METADATA_ITEM_KEY || | |
3495 | (key.type == BTRFS_EXTENT_ITEM_KEY && | |
3496 | key.offset == blocksize))) | |
3497 | ret = 0; | |
3498 | } | |
3499 | ||
3500 | if (ret) { | |
3501 | skinny = false; | |
3502 | btrfs_release_path(path); | |
3503 | goto again; | |
3504 | } | |
3173a18f | 3505 | } |
cdccee99 LB |
3506 | if (ret) { |
3507 | ASSERT(ret == 1); | |
3508 | btrfs_print_leaf(path->nodes[0]); | |
3509 | btrfs_err(fs_info, | |
3510 | "tree block extent item (%llu) is not found in extent tree", | |
3511 | bytenr); | |
3512 | WARN_ON(1); | |
3513 | ret = -EINVAL; | |
3514 | goto out; | |
3515 | } | |
3173a18f | 3516 | |
5d4f98a2 YZ |
3517 | ret = add_tree_block(rc, &key, path, blocks); |
3518 | out: | |
3519 | btrfs_free_path(path); | |
3520 | return ret; | |
3521 | } | |
3522 | ||
3523 | /* | |
3524 | * helper to check if the block use full backrefs for pointers in it | |
3525 | */ | |
3526 | static int block_use_full_backref(struct reloc_control *rc, | |
3527 | struct extent_buffer *eb) | |
3528 | { | |
5d4f98a2 YZ |
3529 | u64 flags; |
3530 | int ret; | |
3531 | ||
3532 | if (btrfs_header_flag(eb, BTRFS_HEADER_FLAG_RELOC) || | |
3533 | btrfs_header_backref_rev(eb) < BTRFS_MIXED_BACKREF_REV) | |
3534 | return 1; | |
3535 | ||
2ff7e61e | 3536 | ret = btrfs_lookup_extent_info(NULL, rc->extent_root->fs_info, |
3173a18f JB |
3537 | eb->start, btrfs_header_level(eb), 1, |
3538 | NULL, &flags); | |
5d4f98a2 YZ |
3539 | BUG_ON(ret); |
3540 | ||
5d4f98a2 YZ |
3541 | if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
3542 | ret = 1; | |
3543 | else | |
3544 | ret = 0; | |
5d4f98a2 YZ |
3545 | return ret; |
3546 | } | |
3547 | ||
0af3d00b | 3548 | static int delete_block_group_cache(struct btrfs_fs_info *fs_info, |
1bbc621e CM |
3549 | struct btrfs_block_group_cache *block_group, |
3550 | struct inode *inode, | |
3551 | u64 ino) | |
0af3d00b JB |
3552 | { |
3553 | struct btrfs_key key; | |
0af3d00b JB |
3554 | struct btrfs_root *root = fs_info->tree_root; |
3555 | struct btrfs_trans_handle *trans; | |
0af3d00b JB |
3556 | int ret = 0; |
3557 | ||
3558 | if (inode) | |
3559 | goto truncate; | |
3560 | ||
3561 | key.objectid = ino; | |
3562 | key.type = BTRFS_INODE_ITEM_KEY; | |
3563 | key.offset = 0; | |
3564 | ||
3565 | inode = btrfs_iget(fs_info->sb, &key, root, NULL); | |
f54fb859 TI |
3566 | if (IS_ERR(inode) || is_bad_inode(inode)) { |
3567 | if (!IS_ERR(inode)) | |
0af3d00b JB |
3568 | iput(inode); |
3569 | return -ENOENT; | |
3570 | } | |
3571 | ||
3572 | truncate: | |
2ff7e61e | 3573 | ret = btrfs_check_trunc_cache_free_space(fs_info, |
7b61cd92 MX |
3574 | &fs_info->global_block_rsv); |
3575 | if (ret) | |
3576 | goto out; | |
3577 | ||
7a7eaa40 | 3578 | trans = btrfs_join_transaction(root); |
0af3d00b | 3579 | if (IS_ERR(trans)) { |
3612b495 | 3580 | ret = PTR_ERR(trans); |
0af3d00b JB |
3581 | goto out; |
3582 | } | |
3583 | ||
77ab86bf | 3584 | ret = btrfs_truncate_free_space_cache(trans, block_group, inode); |
0af3d00b | 3585 | |
3a45bb20 | 3586 | btrfs_end_transaction(trans); |
2ff7e61e | 3587 | btrfs_btree_balance_dirty(fs_info); |
0af3d00b JB |
3588 | out: |
3589 | iput(inode); | |
3590 | return ret; | |
3591 | } | |
3592 | ||
5d4f98a2 YZ |
3593 | /* |
3594 | * helper to add tree blocks for backref of type BTRFS_EXTENT_DATA_REF_KEY | |
3595 | * this function scans fs tree to find blocks reference the data extent | |
3596 | */ | |
3597 | static int find_data_references(struct reloc_control *rc, | |
3598 | struct btrfs_key *extent_key, | |
3599 | struct extent_buffer *leaf, | |
3600 | struct btrfs_extent_data_ref *ref, | |
3601 | struct rb_root *blocks) | |
3602 | { | |
0b246afa | 3603 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 YZ |
3604 | struct btrfs_path *path; |
3605 | struct tree_block *block; | |
3606 | struct btrfs_root *root; | |
3607 | struct btrfs_file_extent_item *fi; | |
3608 | struct rb_node *rb_node; | |
3609 | struct btrfs_key key; | |
3610 | u64 ref_root; | |
3611 | u64 ref_objectid; | |
3612 | u64 ref_offset; | |
3613 | u32 ref_count; | |
3614 | u32 nritems; | |
3615 | int err = 0; | |
3616 | int added = 0; | |
3617 | int counted; | |
3618 | int ret; | |
3619 | ||
5d4f98a2 YZ |
3620 | ref_root = btrfs_extent_data_ref_root(leaf, ref); |
3621 | ref_objectid = btrfs_extent_data_ref_objectid(leaf, ref); | |
3622 | ref_offset = btrfs_extent_data_ref_offset(leaf, ref); | |
3623 | ref_count = btrfs_extent_data_ref_count(leaf, ref); | |
3624 | ||
0af3d00b JB |
3625 | /* |
3626 | * This is an extent belonging to the free space cache, lets just delete | |
3627 | * it and redo the search. | |
3628 | */ | |
3629 | if (ref_root == BTRFS_ROOT_TREE_OBJECTID) { | |
0b246afa | 3630 | ret = delete_block_group_cache(fs_info, rc->block_group, |
0af3d00b JB |
3631 | NULL, ref_objectid); |
3632 | if (ret != -ENOENT) | |
3633 | return ret; | |
3634 | ret = 0; | |
3635 | } | |
3636 | ||
3637 | path = btrfs_alloc_path(); | |
3638 | if (!path) | |
3639 | return -ENOMEM; | |
e4058b54 | 3640 | path->reada = READA_FORWARD; |
0af3d00b | 3641 | |
0b246afa | 3642 | root = read_fs_root(fs_info, ref_root); |
5d4f98a2 YZ |
3643 | if (IS_ERR(root)) { |
3644 | err = PTR_ERR(root); | |
3645 | goto out; | |
3646 | } | |
3647 | ||
3648 | key.objectid = ref_objectid; | |
5d4f98a2 | 3649 | key.type = BTRFS_EXTENT_DATA_KEY; |
84850e8d YZ |
3650 | if (ref_offset > ((u64)-1 << 32)) |
3651 | key.offset = 0; | |
3652 | else | |
3653 | key.offset = ref_offset; | |
5d4f98a2 YZ |
3654 | |
3655 | path->search_commit_root = 1; | |
3656 | path->skip_locking = 1; | |
3657 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3658 | if (ret < 0) { | |
3659 | err = ret; | |
3660 | goto out; | |
3661 | } | |
3662 | ||
3663 | leaf = path->nodes[0]; | |
3664 | nritems = btrfs_header_nritems(leaf); | |
3665 | /* | |
3666 | * the references in tree blocks that use full backrefs | |
3667 | * are not counted in | |
3668 | */ | |
3669 | if (block_use_full_backref(rc, leaf)) | |
3670 | counted = 0; | |
3671 | else | |
3672 | counted = 1; | |
3673 | rb_node = tree_search(blocks, leaf->start); | |
3674 | if (rb_node) { | |
3675 | if (counted) | |
3676 | added = 1; | |
3677 | else | |
3678 | path->slots[0] = nritems; | |
3679 | } | |
3680 | ||
3681 | while (ref_count > 0) { | |
3682 | while (path->slots[0] >= nritems) { | |
3683 | ret = btrfs_next_leaf(root, path); | |
3684 | if (ret < 0) { | |
3685 | err = ret; | |
3686 | goto out; | |
3687 | } | |
fae7f21c | 3688 | if (WARN_ON(ret > 0)) |
5d4f98a2 | 3689 | goto out; |
5d4f98a2 YZ |
3690 | |
3691 | leaf = path->nodes[0]; | |
3692 | nritems = btrfs_header_nritems(leaf); | |
3693 | added = 0; | |
3694 | ||
3695 | if (block_use_full_backref(rc, leaf)) | |
3696 | counted = 0; | |
3697 | else | |
3698 | counted = 1; | |
3699 | rb_node = tree_search(blocks, leaf->start); | |
3700 | if (rb_node) { | |
3701 | if (counted) | |
3702 | added = 1; | |
3703 | else | |
3704 | path->slots[0] = nritems; | |
3705 | } | |
3706 | } | |
3707 | ||
3708 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
fae7f21c DG |
3709 | if (WARN_ON(key.objectid != ref_objectid || |
3710 | key.type != BTRFS_EXTENT_DATA_KEY)) | |
5d4f98a2 | 3711 | break; |
5d4f98a2 YZ |
3712 | |
3713 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
3714 | struct btrfs_file_extent_item); | |
3715 | ||
3716 | if (btrfs_file_extent_type(leaf, fi) == | |
3717 | BTRFS_FILE_EXTENT_INLINE) | |
3718 | goto next; | |
3719 | ||
3720 | if (btrfs_file_extent_disk_bytenr(leaf, fi) != | |
3721 | extent_key->objectid) | |
3722 | goto next; | |
3723 | ||
3724 | key.offset -= btrfs_file_extent_offset(leaf, fi); | |
3725 | if (key.offset != ref_offset) | |
3726 | goto next; | |
3727 | ||
3728 | if (counted) | |
3729 | ref_count--; | |
3730 | if (added) | |
3731 | goto next; | |
3732 | ||
7476dfda | 3733 | if (!tree_block_processed(leaf->start, rc)) { |
5d4f98a2 YZ |
3734 | block = kmalloc(sizeof(*block), GFP_NOFS); |
3735 | if (!block) { | |
3736 | err = -ENOMEM; | |
3737 | break; | |
3738 | } | |
3739 | block->bytenr = leaf->start; | |
3740 | btrfs_item_key_to_cpu(leaf, &block->key, 0); | |
3741 | block->level = 0; | |
3742 | block->key_ready = 1; | |
3743 | rb_node = tree_insert(blocks, block->bytenr, | |
3744 | &block->rb_node); | |
43c04fb1 JM |
3745 | if (rb_node) |
3746 | backref_tree_panic(rb_node, -EEXIST, | |
3747 | block->bytenr); | |
5d4f98a2 YZ |
3748 | } |
3749 | if (counted) | |
3750 | added = 1; | |
3751 | else | |
3752 | path->slots[0] = nritems; | |
3753 | next: | |
3754 | path->slots[0]++; | |
3755 | ||
3756 | } | |
3757 | out: | |
3758 | btrfs_free_path(path); | |
3759 | return err; | |
3760 | } | |
3761 | ||
3762 | /* | |
2c016dc2 | 3763 | * helper to find all tree blocks that reference a given data extent |
5d4f98a2 YZ |
3764 | */ |
3765 | static noinline_for_stack | |
3766 | int add_data_references(struct reloc_control *rc, | |
3767 | struct btrfs_key *extent_key, | |
3768 | struct btrfs_path *path, | |
3769 | struct rb_root *blocks) | |
3770 | { | |
3771 | struct btrfs_key key; | |
3772 | struct extent_buffer *eb; | |
3773 | struct btrfs_extent_data_ref *dref; | |
3774 | struct btrfs_extent_inline_ref *iref; | |
3775 | unsigned long ptr; | |
3776 | unsigned long end; | |
da17066c | 3777 | u32 blocksize = rc->extent_root->fs_info->nodesize; |
647f63bd | 3778 | int ret = 0; |
5d4f98a2 YZ |
3779 | int err = 0; |
3780 | ||
5d4f98a2 YZ |
3781 | eb = path->nodes[0]; |
3782 | ptr = btrfs_item_ptr_offset(eb, path->slots[0]); | |
3783 | end = ptr + btrfs_item_size_nr(eb, path->slots[0]); | |
3784 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3785 | if (ptr + sizeof(struct btrfs_extent_item_v0) == end) | |
3786 | ptr = end; | |
3787 | else | |
3788 | #endif | |
3789 | ptr += sizeof(struct btrfs_extent_item); | |
3790 | ||
3791 | while (ptr < end) { | |
3792 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
3de28d57 LB |
3793 | key.type = btrfs_get_extent_inline_ref_type(eb, iref, |
3794 | BTRFS_REF_TYPE_DATA); | |
5d4f98a2 YZ |
3795 | if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
3796 | key.offset = btrfs_extent_inline_ref_offset(eb, iref); | |
3797 | ret = __add_tree_block(rc, key.offset, blocksize, | |
3798 | blocks); | |
3799 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
3800 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
3801 | ret = find_data_references(rc, extent_key, | |
3802 | eb, dref, blocks); | |
3803 | } else { | |
b14c55a1 LB |
3804 | ret = -EINVAL; |
3805 | btrfs_err(rc->extent_root->fs_info, | |
3806 | "extent %llu slot %d has an invalid inline ref type", | |
3807 | eb->start, path->slots[0]); | |
5d4f98a2 | 3808 | } |
647f63bd FDBM |
3809 | if (ret) { |
3810 | err = ret; | |
3811 | goto out; | |
3812 | } | |
5d4f98a2 YZ |
3813 | ptr += btrfs_extent_inline_ref_size(key.type); |
3814 | } | |
3815 | WARN_ON(ptr > end); | |
3816 | ||
3817 | while (1) { | |
3818 | cond_resched(); | |
3819 | eb = path->nodes[0]; | |
3820 | if (path->slots[0] >= btrfs_header_nritems(eb)) { | |
3821 | ret = btrfs_next_leaf(rc->extent_root, path); | |
3822 | if (ret < 0) { | |
3823 | err = ret; | |
3824 | break; | |
3825 | } | |
3826 | if (ret > 0) | |
3827 | break; | |
3828 | eb = path->nodes[0]; | |
3829 | } | |
3830 | ||
3831 | btrfs_item_key_to_cpu(eb, &key, path->slots[0]); | |
3832 | if (key.objectid != extent_key->objectid) | |
3833 | break; | |
3834 | ||
3835 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3836 | if (key.type == BTRFS_SHARED_DATA_REF_KEY || | |
3837 | key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
3838 | #else | |
3839 | BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); | |
3840 | if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
3841 | #endif | |
3842 | ret = __add_tree_block(rc, key.offset, blocksize, | |
3843 | blocks); | |
3844 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
3845 | dref = btrfs_item_ptr(eb, path->slots[0], | |
3846 | struct btrfs_extent_data_ref); | |
3847 | ret = find_data_references(rc, extent_key, | |
3848 | eb, dref, blocks); | |
3849 | } else { | |
3850 | ret = 0; | |
3851 | } | |
3852 | if (ret) { | |
3853 | err = ret; | |
3854 | break; | |
3855 | } | |
3856 | path->slots[0]++; | |
3857 | } | |
647f63bd | 3858 | out: |
b3b4aa74 | 3859 | btrfs_release_path(path); |
5d4f98a2 YZ |
3860 | if (err) |
3861 | free_block_list(blocks); | |
3862 | return err; | |
3863 | } | |
3864 | ||
3865 | /* | |
2c016dc2 | 3866 | * helper to find next unprocessed extent |
5d4f98a2 YZ |
3867 | */ |
3868 | static noinline_for_stack | |
147d256e | 3869 | int find_next_extent(struct reloc_control *rc, struct btrfs_path *path, |
3fd0a558 | 3870 | struct btrfs_key *extent_key) |
5d4f98a2 | 3871 | { |
0b246afa | 3872 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 YZ |
3873 | struct btrfs_key key; |
3874 | struct extent_buffer *leaf; | |
3875 | u64 start, end, last; | |
3876 | int ret; | |
3877 | ||
3878 | last = rc->block_group->key.objectid + rc->block_group->key.offset; | |
3879 | while (1) { | |
3880 | cond_resched(); | |
3881 | if (rc->search_start >= last) { | |
3882 | ret = 1; | |
3883 | break; | |
3884 | } | |
3885 | ||
3886 | key.objectid = rc->search_start; | |
3887 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3888 | key.offset = 0; | |
3889 | ||
3890 | path->search_commit_root = 1; | |
3891 | path->skip_locking = 1; | |
3892 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, | |
3893 | 0, 0); | |
3894 | if (ret < 0) | |
3895 | break; | |
3896 | next: | |
3897 | leaf = path->nodes[0]; | |
3898 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
3899 | ret = btrfs_next_leaf(rc->extent_root, path); | |
3900 | if (ret != 0) | |
3901 | break; | |
3902 | leaf = path->nodes[0]; | |
3903 | } | |
3904 | ||
3905 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
3906 | if (key.objectid >= last) { | |
3907 | ret = 1; | |
3908 | break; | |
3909 | } | |
3910 | ||
3173a18f JB |
3911 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3912 | key.type != BTRFS_METADATA_ITEM_KEY) { | |
3913 | path->slots[0]++; | |
3914 | goto next; | |
3915 | } | |
3916 | ||
3917 | if (key.type == BTRFS_EXTENT_ITEM_KEY && | |
5d4f98a2 YZ |
3918 | key.objectid + key.offset <= rc->search_start) { |
3919 | path->slots[0]++; | |
3920 | goto next; | |
3921 | } | |
3922 | ||
3173a18f | 3923 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
0b246afa | 3924 | key.objectid + fs_info->nodesize <= |
3173a18f JB |
3925 | rc->search_start) { |
3926 | path->slots[0]++; | |
3927 | goto next; | |
3928 | } | |
3929 | ||
5d4f98a2 YZ |
3930 | ret = find_first_extent_bit(&rc->processed_blocks, |
3931 | key.objectid, &start, &end, | |
e6138876 | 3932 | EXTENT_DIRTY, NULL); |
5d4f98a2 YZ |
3933 | |
3934 | if (ret == 0 && start <= key.objectid) { | |
b3b4aa74 | 3935 | btrfs_release_path(path); |
5d4f98a2 YZ |
3936 | rc->search_start = end + 1; |
3937 | } else { | |
3173a18f JB |
3938 | if (key.type == BTRFS_EXTENT_ITEM_KEY) |
3939 | rc->search_start = key.objectid + key.offset; | |
3940 | else | |
3941 | rc->search_start = key.objectid + | |
0b246afa | 3942 | fs_info->nodesize; |
3fd0a558 | 3943 | memcpy(extent_key, &key, sizeof(key)); |
5d4f98a2 YZ |
3944 | return 0; |
3945 | } | |
3946 | } | |
b3b4aa74 | 3947 | btrfs_release_path(path); |
5d4f98a2 YZ |
3948 | return ret; |
3949 | } | |
3950 | ||
3951 | static void set_reloc_control(struct reloc_control *rc) | |
3952 | { | |
3953 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; | |
7585717f CM |
3954 | |
3955 | mutex_lock(&fs_info->reloc_mutex); | |
5d4f98a2 | 3956 | fs_info->reloc_ctl = rc; |
7585717f | 3957 | mutex_unlock(&fs_info->reloc_mutex); |
5d4f98a2 YZ |
3958 | } |
3959 | ||
3960 | static void unset_reloc_control(struct reloc_control *rc) | |
3961 | { | |
3962 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; | |
7585717f CM |
3963 | |
3964 | mutex_lock(&fs_info->reloc_mutex); | |
5d4f98a2 | 3965 | fs_info->reloc_ctl = NULL; |
7585717f | 3966 | mutex_unlock(&fs_info->reloc_mutex); |
5d4f98a2 YZ |
3967 | } |
3968 | ||
3969 | static int check_extent_flags(u64 flags) | |
3970 | { | |
3971 | if ((flags & BTRFS_EXTENT_FLAG_DATA) && | |
3972 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) | |
3973 | return 1; | |
3974 | if (!(flags & BTRFS_EXTENT_FLAG_DATA) && | |
3975 | !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) | |
3976 | return 1; | |
3977 | if ((flags & BTRFS_EXTENT_FLAG_DATA) && | |
3978 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
3979 | return 1; | |
3980 | return 0; | |
3981 | } | |
3982 | ||
3fd0a558 YZ |
3983 | static noinline_for_stack |
3984 | int prepare_to_relocate(struct reloc_control *rc) | |
3985 | { | |
3986 | struct btrfs_trans_handle *trans; | |
ac2fabac | 3987 | int ret; |
3fd0a558 | 3988 | |
2ff7e61e | 3989 | rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root->fs_info, |
66d8f3dd | 3990 | BTRFS_BLOCK_RSV_TEMP); |
3fd0a558 YZ |
3991 | if (!rc->block_rsv) |
3992 | return -ENOMEM; | |
3993 | ||
3fd0a558 YZ |
3994 | memset(&rc->cluster, 0, sizeof(rc->cluster)); |
3995 | rc->search_start = rc->block_group->key.objectid; | |
3996 | rc->extents_found = 0; | |
3997 | rc->nodes_relocated = 0; | |
3998 | rc->merging_rsv_size = 0; | |
0647bf56 | 3999 | rc->reserved_bytes = 0; |
da17066c | 4000 | rc->block_rsv->size = rc->extent_root->fs_info->nodesize * |
0647bf56 | 4001 | RELOCATION_RESERVED_NODES; |
ac2fabac JB |
4002 | ret = btrfs_block_rsv_refill(rc->extent_root, |
4003 | rc->block_rsv, rc->block_rsv->size, | |
4004 | BTRFS_RESERVE_FLUSH_ALL); | |
4005 | if (ret) | |
4006 | return ret; | |
3fd0a558 YZ |
4007 | |
4008 | rc->create_reloc_tree = 1; | |
4009 | set_reloc_control(rc); | |
4010 | ||
7a7eaa40 | 4011 | trans = btrfs_join_transaction(rc->extent_root); |
28818947 LB |
4012 | if (IS_ERR(trans)) { |
4013 | unset_reloc_control(rc); | |
4014 | /* | |
4015 | * extent tree is not a ref_cow tree and has no reloc_root to | |
4016 | * cleanup. And callers are responsible to free the above | |
4017 | * block rsv. | |
4018 | */ | |
4019 | return PTR_ERR(trans); | |
4020 | } | |
3a45bb20 | 4021 | btrfs_commit_transaction(trans); |
3fd0a558 YZ |
4022 | return 0; |
4023 | } | |
76dda93c | 4024 | |
5d4f98a2 YZ |
4025 | static noinline_for_stack int relocate_block_group(struct reloc_control *rc) |
4026 | { | |
2ff7e61e | 4027 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
5d4f98a2 YZ |
4028 | struct rb_root blocks = RB_ROOT; |
4029 | struct btrfs_key key; | |
4030 | struct btrfs_trans_handle *trans = NULL; | |
4031 | struct btrfs_path *path; | |
4032 | struct btrfs_extent_item *ei; | |
5d4f98a2 YZ |
4033 | u64 flags; |
4034 | u32 item_size; | |
4035 | int ret; | |
4036 | int err = 0; | |
c87f08ca | 4037 | int progress = 0; |
5d4f98a2 YZ |
4038 | |
4039 | path = btrfs_alloc_path(); | |
3fd0a558 | 4040 | if (!path) |
5d4f98a2 | 4041 | return -ENOMEM; |
e4058b54 | 4042 | path->reada = READA_FORWARD; |
5d4f98a2 | 4043 | |
3fd0a558 YZ |
4044 | ret = prepare_to_relocate(rc); |
4045 | if (ret) { | |
4046 | err = ret; | |
4047 | goto out_free; | |
4048 | } | |
5d4f98a2 YZ |
4049 | |
4050 | while (1) { | |
0647bf56 WS |
4051 | rc->reserved_bytes = 0; |
4052 | ret = btrfs_block_rsv_refill(rc->extent_root, | |
4053 | rc->block_rsv, rc->block_rsv->size, | |
4054 | BTRFS_RESERVE_FLUSH_ALL); | |
4055 | if (ret) { | |
4056 | err = ret; | |
4057 | break; | |
4058 | } | |
c87f08ca | 4059 | progress++; |
a22285a6 | 4060 | trans = btrfs_start_transaction(rc->extent_root, 0); |
0f788c58 LB |
4061 | if (IS_ERR(trans)) { |
4062 | err = PTR_ERR(trans); | |
4063 | trans = NULL; | |
4064 | break; | |
4065 | } | |
c87f08ca | 4066 | restart: |
3fd0a558 | 4067 | if (update_backref_cache(trans, &rc->backref_cache)) { |
3a45bb20 | 4068 | btrfs_end_transaction(trans); |
3fd0a558 YZ |
4069 | continue; |
4070 | } | |
4071 | ||
147d256e | 4072 | ret = find_next_extent(rc, path, &key); |
5d4f98a2 YZ |
4073 | if (ret < 0) |
4074 | err = ret; | |
4075 | if (ret != 0) | |
4076 | break; | |
4077 | ||
4078 | rc->extents_found++; | |
4079 | ||
4080 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
4081 | struct btrfs_extent_item); | |
3fd0a558 | 4082 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); |
5d4f98a2 YZ |
4083 | if (item_size >= sizeof(*ei)) { |
4084 | flags = btrfs_extent_flags(path->nodes[0], ei); | |
4085 | ret = check_extent_flags(flags); | |
4086 | BUG_ON(ret); | |
4087 | ||
4088 | } else { | |
4089 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
4090 | u64 ref_owner; | |
4091 | int path_change = 0; | |
4092 | ||
4093 | BUG_ON(item_size != | |
4094 | sizeof(struct btrfs_extent_item_v0)); | |
4095 | ret = get_ref_objectid_v0(rc, path, &key, &ref_owner, | |
4096 | &path_change); | |
4b3576e4 Z |
4097 | if (ret < 0) { |
4098 | err = ret; | |
4099 | break; | |
4100 | } | |
5d4f98a2 YZ |
4101 | if (ref_owner < BTRFS_FIRST_FREE_OBJECTID) |
4102 | flags = BTRFS_EXTENT_FLAG_TREE_BLOCK; | |
4103 | else | |
4104 | flags = BTRFS_EXTENT_FLAG_DATA; | |
4105 | ||
4106 | if (path_change) { | |
b3b4aa74 | 4107 | btrfs_release_path(path); |
5d4f98a2 YZ |
4108 | |
4109 | path->search_commit_root = 1; | |
4110 | path->skip_locking = 1; | |
4111 | ret = btrfs_search_slot(NULL, rc->extent_root, | |
4112 | &key, path, 0, 0); | |
4113 | if (ret < 0) { | |
4114 | err = ret; | |
4115 | break; | |
4116 | } | |
4117 | BUG_ON(ret > 0); | |
4118 | } | |
4119 | #else | |
4120 | BUG(); | |
4121 | #endif | |
4122 | } | |
4123 | ||
4124 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
4125 | ret = add_tree_block(rc, &key, path, &blocks); | |
4126 | } else if (rc->stage == UPDATE_DATA_PTRS && | |
3fd0a558 | 4127 | (flags & BTRFS_EXTENT_FLAG_DATA)) { |
5d4f98a2 YZ |
4128 | ret = add_data_references(rc, &key, path, &blocks); |
4129 | } else { | |
b3b4aa74 | 4130 | btrfs_release_path(path); |
5d4f98a2 YZ |
4131 | ret = 0; |
4132 | } | |
4133 | if (ret < 0) { | |
3fd0a558 | 4134 | err = ret; |
5d4f98a2 YZ |
4135 | break; |
4136 | } | |
4137 | ||
4138 | if (!RB_EMPTY_ROOT(&blocks)) { | |
4139 | ret = relocate_tree_blocks(trans, rc, &blocks); | |
4140 | if (ret < 0) { | |
1708cc57 WS |
4141 | /* |
4142 | * if we fail to relocate tree blocks, force to update | |
4143 | * backref cache when committing transaction. | |
4144 | */ | |
4145 | rc->backref_cache.last_trans = trans->transid - 1; | |
4146 | ||
3fd0a558 YZ |
4147 | if (ret != -EAGAIN) { |
4148 | err = ret; | |
4149 | break; | |
4150 | } | |
4151 | rc->extents_found--; | |
4152 | rc->search_start = key.objectid; | |
4153 | } | |
4154 | } | |
4155 | ||
3a45bb20 | 4156 | btrfs_end_transaction_throttle(trans); |
2ff7e61e | 4157 | btrfs_btree_balance_dirty(fs_info); |
5d4f98a2 | 4158 | trans = NULL; |
5d4f98a2 YZ |
4159 | |
4160 | if (rc->stage == MOVE_DATA_EXTENTS && | |
4161 | (flags & BTRFS_EXTENT_FLAG_DATA)) { | |
4162 | rc->found_file_extent = 1; | |
0257bb82 | 4163 | ret = relocate_data_extent(rc->data_inode, |
3fd0a558 | 4164 | &key, &rc->cluster); |
5d4f98a2 YZ |
4165 | if (ret < 0) { |
4166 | err = ret; | |
4167 | break; | |
4168 | } | |
4169 | } | |
4170 | } | |
c87f08ca | 4171 | if (trans && progress && err == -ENOSPC) { |
2ff7e61e | 4172 | ret = btrfs_force_chunk_alloc(trans, fs_info, |
c87f08ca | 4173 | rc->block_group->flags); |
9689457b | 4174 | if (ret == 1) { |
c87f08ca CM |
4175 | err = 0; |
4176 | progress = 0; | |
4177 | goto restart; | |
4178 | } | |
4179 | } | |
3fd0a558 | 4180 | |
b3b4aa74 | 4181 | btrfs_release_path(path); |
91166212 | 4182 | clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY); |
5d4f98a2 YZ |
4183 | |
4184 | if (trans) { | |
3a45bb20 | 4185 | btrfs_end_transaction_throttle(trans); |
2ff7e61e | 4186 | btrfs_btree_balance_dirty(fs_info); |
5d4f98a2 YZ |
4187 | } |
4188 | ||
0257bb82 | 4189 | if (!err) { |
3fd0a558 YZ |
4190 | ret = relocate_file_extent_cluster(rc->data_inode, |
4191 | &rc->cluster); | |
0257bb82 YZ |
4192 | if (ret < 0) |
4193 | err = ret; | |
4194 | } | |
4195 | ||
3fd0a558 YZ |
4196 | rc->create_reloc_tree = 0; |
4197 | set_reloc_control(rc); | |
0257bb82 | 4198 | |
3fd0a558 | 4199 | backref_cache_cleanup(&rc->backref_cache); |
2ff7e61e | 4200 | btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1); |
5d4f98a2 | 4201 | |
3fd0a558 | 4202 | err = prepare_to_merge(rc, err); |
5d4f98a2 YZ |
4203 | |
4204 | merge_reloc_roots(rc); | |
4205 | ||
3fd0a558 | 4206 | rc->merge_reloc_tree = 0; |
5d4f98a2 | 4207 | unset_reloc_control(rc); |
2ff7e61e | 4208 | btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1); |
5d4f98a2 YZ |
4209 | |
4210 | /* get rid of pinned extents */ | |
7a7eaa40 | 4211 | trans = btrfs_join_transaction(rc->extent_root); |
62b99540 | 4212 | if (IS_ERR(trans)) { |
3612b495 | 4213 | err = PTR_ERR(trans); |
62b99540 QW |
4214 | goto out_free; |
4215 | } | |
3a45bb20 | 4216 | btrfs_commit_transaction(trans); |
3fd0a558 | 4217 | out_free: |
2ff7e61e | 4218 | btrfs_free_block_rsv(fs_info, rc->block_rsv); |
3fd0a558 | 4219 | btrfs_free_path(path); |
5d4f98a2 YZ |
4220 | return err; |
4221 | } | |
4222 | ||
4223 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, | |
0257bb82 | 4224 | struct btrfs_root *root, u64 objectid) |
5d4f98a2 YZ |
4225 | { |
4226 | struct btrfs_path *path; | |
4227 | struct btrfs_inode_item *item; | |
4228 | struct extent_buffer *leaf; | |
4229 | int ret; | |
4230 | ||
4231 | path = btrfs_alloc_path(); | |
4232 | if (!path) | |
4233 | return -ENOMEM; | |
4234 | ||
4235 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); | |
4236 | if (ret) | |
4237 | goto out; | |
4238 | ||
4239 | leaf = path->nodes[0]; | |
4240 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); | |
b159fa28 | 4241 | memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item)); |
5d4f98a2 | 4242 | btrfs_set_inode_generation(leaf, item, 1); |
0257bb82 | 4243 | btrfs_set_inode_size(leaf, item, 0); |
5d4f98a2 | 4244 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); |
3fd0a558 YZ |
4245 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS | |
4246 | BTRFS_INODE_PREALLOC); | |
5d4f98a2 | 4247 | btrfs_mark_buffer_dirty(leaf); |
5d4f98a2 YZ |
4248 | out: |
4249 | btrfs_free_path(path); | |
4250 | return ret; | |
4251 | } | |
4252 | ||
4253 | /* | |
4254 | * helper to create inode for data relocation. | |
4255 | * the inode is in data relocation tree and its link count is 0 | |
4256 | */ | |
3fd0a558 YZ |
4257 | static noinline_for_stack |
4258 | struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, | |
4259 | struct btrfs_block_group_cache *group) | |
5d4f98a2 YZ |
4260 | { |
4261 | struct inode *inode = NULL; | |
4262 | struct btrfs_trans_handle *trans; | |
4263 | struct btrfs_root *root; | |
4264 | struct btrfs_key key; | |
4624900d | 4265 | u64 objectid; |
5d4f98a2 YZ |
4266 | int err = 0; |
4267 | ||
4268 | root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); | |
4269 | if (IS_ERR(root)) | |
4270 | return ERR_CAST(root); | |
4271 | ||
a22285a6 | 4272 | trans = btrfs_start_transaction(root, 6); |
3fd0a558 YZ |
4273 | if (IS_ERR(trans)) |
4274 | return ERR_CAST(trans); | |
5d4f98a2 | 4275 | |
581bb050 | 4276 | err = btrfs_find_free_objectid(root, &objectid); |
5d4f98a2 YZ |
4277 | if (err) |
4278 | goto out; | |
4279 | ||
0257bb82 | 4280 | err = __insert_orphan_inode(trans, root, objectid); |
5d4f98a2 YZ |
4281 | BUG_ON(err); |
4282 | ||
4283 | key.objectid = objectid; | |
4284 | key.type = BTRFS_INODE_ITEM_KEY; | |
4285 | key.offset = 0; | |
0b246afa | 4286 | inode = btrfs_iget(fs_info->sb, &key, root, NULL); |
5d4f98a2 YZ |
4287 | BUG_ON(IS_ERR(inode) || is_bad_inode(inode)); |
4288 | BTRFS_I(inode)->index_cnt = group->key.objectid; | |
4289 | ||
73f2e545 | 4290 | err = btrfs_orphan_add(trans, BTRFS_I(inode)); |
5d4f98a2 | 4291 | out: |
3a45bb20 | 4292 | btrfs_end_transaction(trans); |
2ff7e61e | 4293 | btrfs_btree_balance_dirty(fs_info); |
5d4f98a2 YZ |
4294 | if (err) { |
4295 | if (inode) | |
4296 | iput(inode); | |
4297 | inode = ERR_PTR(err); | |
4298 | } | |
4299 | return inode; | |
4300 | } | |
4301 | ||
9113493e | 4302 | static struct reloc_control *alloc_reloc_control(void) |
3fd0a558 YZ |
4303 | { |
4304 | struct reloc_control *rc; | |
4305 | ||
4306 | rc = kzalloc(sizeof(*rc), GFP_NOFS); | |
4307 | if (!rc) | |
4308 | return NULL; | |
4309 | ||
4310 | INIT_LIST_HEAD(&rc->reloc_roots); | |
4311 | backref_cache_init(&rc->backref_cache); | |
4312 | mapping_tree_init(&rc->reloc_root_tree); | |
c6100a4b | 4313 | extent_io_tree_init(&rc->processed_blocks, NULL); |
3fd0a558 YZ |
4314 | return rc; |
4315 | } | |
4316 | ||
ebce0e01 AB |
4317 | /* |
4318 | * Print the block group being relocated | |
4319 | */ | |
4320 | static void describe_relocation(struct btrfs_fs_info *fs_info, | |
4321 | struct btrfs_block_group_cache *block_group) | |
4322 | { | |
4323 | char buf[128]; /* prefixed by a '|' that'll be dropped */ | |
4324 | u64 flags = block_group->flags; | |
4325 | ||
4326 | /* Shouldn't happen */ | |
4327 | if (!flags) { | |
4328 | strcpy(buf, "|NONE"); | |
4329 | } else { | |
4330 | char *bp = buf; | |
4331 | ||
4332 | #define DESCRIBE_FLAG(f, d) \ | |
4333 | if (flags & BTRFS_BLOCK_GROUP_##f) { \ | |
4334 | bp += snprintf(bp, buf - bp + sizeof(buf), "|%s", d); \ | |
4335 | flags &= ~BTRFS_BLOCK_GROUP_##f; \ | |
4336 | } | |
4337 | DESCRIBE_FLAG(DATA, "data"); | |
4338 | DESCRIBE_FLAG(SYSTEM, "system"); | |
4339 | DESCRIBE_FLAG(METADATA, "metadata"); | |
4340 | DESCRIBE_FLAG(RAID0, "raid0"); | |
4341 | DESCRIBE_FLAG(RAID1, "raid1"); | |
4342 | DESCRIBE_FLAG(DUP, "dup"); | |
4343 | DESCRIBE_FLAG(RAID10, "raid10"); | |
4344 | DESCRIBE_FLAG(RAID5, "raid5"); | |
4345 | DESCRIBE_FLAG(RAID6, "raid6"); | |
4346 | if (flags) | |
b78e2b78 | 4347 | snprintf(bp, buf - bp + sizeof(buf), "|0x%llx", flags); |
ebce0e01 AB |
4348 | #undef DESCRIBE_FLAG |
4349 | } | |
4350 | ||
4351 | btrfs_info(fs_info, | |
4352 | "relocating block group %llu flags %s", | |
4353 | block_group->key.objectid, buf + 1); | |
4354 | } | |
4355 | ||
5d4f98a2 YZ |
4356 | /* |
4357 | * function to relocate all extents in a block group. | |
4358 | */ | |
6bccf3ab | 4359 | int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start) |
5d4f98a2 | 4360 | { |
6bccf3ab | 4361 | struct btrfs_root *extent_root = fs_info->extent_root; |
5d4f98a2 | 4362 | struct reloc_control *rc; |
0af3d00b JB |
4363 | struct inode *inode; |
4364 | struct btrfs_path *path; | |
5d4f98a2 | 4365 | int ret; |
f0486c68 | 4366 | int rw = 0; |
5d4f98a2 YZ |
4367 | int err = 0; |
4368 | ||
9113493e | 4369 | rc = alloc_reloc_control(); |
5d4f98a2 YZ |
4370 | if (!rc) |
4371 | return -ENOMEM; | |
4372 | ||
f0486c68 | 4373 | rc->extent_root = extent_root; |
3fd0a558 | 4374 | |
5d4f98a2 YZ |
4375 | rc->block_group = btrfs_lookup_block_group(fs_info, group_start); |
4376 | BUG_ON(!rc->block_group); | |
4377 | ||
c83488af | 4378 | ret = btrfs_inc_block_group_ro(rc->block_group); |
868f401a Z |
4379 | if (ret) { |
4380 | err = ret; | |
4381 | goto out; | |
f0486c68 | 4382 | } |
868f401a | 4383 | rw = 1; |
f0486c68 | 4384 | |
0af3d00b JB |
4385 | path = btrfs_alloc_path(); |
4386 | if (!path) { | |
4387 | err = -ENOMEM; | |
4388 | goto out; | |
4389 | } | |
4390 | ||
77ab86bf | 4391 | inode = lookup_free_space_inode(fs_info, rc->block_group, path); |
0af3d00b JB |
4392 | btrfs_free_path(path); |
4393 | ||
4394 | if (!IS_ERR(inode)) | |
1bbc621e | 4395 | ret = delete_block_group_cache(fs_info, rc->block_group, inode, 0); |
0af3d00b JB |
4396 | else |
4397 | ret = PTR_ERR(inode); | |
4398 | ||
4399 | if (ret && ret != -ENOENT) { | |
4400 | err = ret; | |
4401 | goto out; | |
4402 | } | |
4403 | ||
5d4f98a2 YZ |
4404 | rc->data_inode = create_reloc_inode(fs_info, rc->block_group); |
4405 | if (IS_ERR(rc->data_inode)) { | |
4406 | err = PTR_ERR(rc->data_inode); | |
4407 | rc->data_inode = NULL; | |
4408 | goto out; | |
4409 | } | |
4410 | ||
0b246afa | 4411 | describe_relocation(fs_info, rc->block_group); |
5d4f98a2 | 4412 | |
9cfa3e34 | 4413 | btrfs_wait_block_group_reservations(rc->block_group); |
f78c436c | 4414 | btrfs_wait_nocow_writers(rc->block_group); |
6374e57a | 4415 | btrfs_wait_ordered_roots(fs_info, U64_MAX, |
578def7c FM |
4416 | rc->block_group->key.objectid, |
4417 | rc->block_group->key.offset); | |
5d4f98a2 YZ |
4418 | |
4419 | while (1) { | |
76dda93c | 4420 | mutex_lock(&fs_info->cleaner_mutex); |
5d4f98a2 | 4421 | ret = relocate_block_group(rc); |
76dda93c | 4422 | mutex_unlock(&fs_info->cleaner_mutex); |
5d4f98a2 YZ |
4423 | if (ret < 0) { |
4424 | err = ret; | |
3fd0a558 | 4425 | goto out; |
5d4f98a2 YZ |
4426 | } |
4427 | ||
4428 | if (rc->extents_found == 0) | |
4429 | break; | |
4430 | ||
0b246afa | 4431 | btrfs_info(fs_info, "found %llu extents", rc->extents_found); |
5d4f98a2 YZ |
4432 | |
4433 | if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { | |
0ef8b726 JB |
4434 | ret = btrfs_wait_ordered_range(rc->data_inode, 0, |
4435 | (u64)-1); | |
4436 | if (ret) { | |
4437 | err = ret; | |
4438 | goto out; | |
4439 | } | |
5d4f98a2 YZ |
4440 | invalidate_mapping_pages(rc->data_inode->i_mapping, |
4441 | 0, -1); | |
4442 | rc->stage = UPDATE_DATA_PTRS; | |
5d4f98a2 YZ |
4443 | } |
4444 | } | |
4445 | ||
5d4f98a2 YZ |
4446 | WARN_ON(rc->block_group->pinned > 0); |
4447 | WARN_ON(rc->block_group->reserved > 0); | |
4448 | WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0); | |
4449 | out: | |
f0486c68 | 4450 | if (err && rw) |
2ff7e61e | 4451 | btrfs_dec_block_group_ro(rc->block_group); |
5d4f98a2 | 4452 | iput(rc->data_inode); |
5d4f98a2 YZ |
4453 | btrfs_put_block_group(rc->block_group); |
4454 | kfree(rc); | |
4455 | return err; | |
4456 | } | |
4457 | ||
76dda93c YZ |
4458 | static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) |
4459 | { | |
0b246afa | 4460 | struct btrfs_fs_info *fs_info = root->fs_info; |
76dda93c | 4461 | struct btrfs_trans_handle *trans; |
79787eaa | 4462 | int ret, err; |
76dda93c | 4463 | |
0b246afa | 4464 | trans = btrfs_start_transaction(fs_info->tree_root, 0); |
79787eaa JM |
4465 | if (IS_ERR(trans)) |
4466 | return PTR_ERR(trans); | |
76dda93c YZ |
4467 | |
4468 | memset(&root->root_item.drop_progress, 0, | |
4469 | sizeof(root->root_item.drop_progress)); | |
4470 | root->root_item.drop_level = 0; | |
4471 | btrfs_set_root_refs(&root->root_item, 0); | |
0b246afa | 4472 | ret = btrfs_update_root(trans, fs_info->tree_root, |
76dda93c | 4473 | &root->root_key, &root->root_item); |
76dda93c | 4474 | |
3a45bb20 | 4475 | err = btrfs_end_transaction(trans); |
79787eaa JM |
4476 | if (err) |
4477 | return err; | |
4478 | return ret; | |
76dda93c YZ |
4479 | } |
4480 | ||
5d4f98a2 YZ |
4481 | /* |
4482 | * recover relocation interrupted by system crash. | |
4483 | * | |
4484 | * this function resumes merging reloc trees with corresponding fs trees. | |
4485 | * this is important for keeping the sharing of tree blocks | |
4486 | */ | |
4487 | int btrfs_recover_relocation(struct btrfs_root *root) | |
4488 | { | |
0b246afa | 4489 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
4490 | LIST_HEAD(reloc_roots); |
4491 | struct btrfs_key key; | |
4492 | struct btrfs_root *fs_root; | |
4493 | struct btrfs_root *reloc_root; | |
4494 | struct btrfs_path *path; | |
4495 | struct extent_buffer *leaf; | |
4496 | struct reloc_control *rc = NULL; | |
4497 | struct btrfs_trans_handle *trans; | |
4498 | int ret; | |
4499 | int err = 0; | |
4500 | ||
4501 | path = btrfs_alloc_path(); | |
4502 | if (!path) | |
4503 | return -ENOMEM; | |
e4058b54 | 4504 | path->reada = READA_BACK; |
5d4f98a2 YZ |
4505 | |
4506 | key.objectid = BTRFS_TREE_RELOC_OBJECTID; | |
4507 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4508 | key.offset = (u64)-1; | |
4509 | ||
4510 | while (1) { | |
0b246afa | 4511 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, |
5d4f98a2 YZ |
4512 | path, 0, 0); |
4513 | if (ret < 0) { | |
4514 | err = ret; | |
4515 | goto out; | |
4516 | } | |
4517 | if (ret > 0) { | |
4518 | if (path->slots[0] == 0) | |
4519 | break; | |
4520 | path->slots[0]--; | |
4521 | } | |
4522 | leaf = path->nodes[0]; | |
4523 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 4524 | btrfs_release_path(path); |
5d4f98a2 YZ |
4525 | |
4526 | if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || | |
4527 | key.type != BTRFS_ROOT_ITEM_KEY) | |
4528 | break; | |
4529 | ||
cb517eab | 4530 | reloc_root = btrfs_read_fs_root(root, &key); |
5d4f98a2 YZ |
4531 | if (IS_ERR(reloc_root)) { |
4532 | err = PTR_ERR(reloc_root); | |
4533 | goto out; | |
4534 | } | |
4535 | ||
4536 | list_add(&reloc_root->root_list, &reloc_roots); | |
4537 | ||
4538 | if (btrfs_root_refs(&reloc_root->root_item) > 0) { | |
0b246afa | 4539 | fs_root = read_fs_root(fs_info, |
5d4f98a2 YZ |
4540 | reloc_root->root_key.offset); |
4541 | if (IS_ERR(fs_root)) { | |
76dda93c YZ |
4542 | ret = PTR_ERR(fs_root); |
4543 | if (ret != -ENOENT) { | |
4544 | err = ret; | |
4545 | goto out; | |
4546 | } | |
79787eaa JM |
4547 | ret = mark_garbage_root(reloc_root); |
4548 | if (ret < 0) { | |
4549 | err = ret; | |
4550 | goto out; | |
4551 | } | |
5d4f98a2 YZ |
4552 | } |
4553 | } | |
4554 | ||
4555 | if (key.offset == 0) | |
4556 | break; | |
4557 | ||
4558 | key.offset--; | |
4559 | } | |
b3b4aa74 | 4560 | btrfs_release_path(path); |
5d4f98a2 YZ |
4561 | |
4562 | if (list_empty(&reloc_roots)) | |
4563 | goto out; | |
4564 | ||
9113493e | 4565 | rc = alloc_reloc_control(); |
5d4f98a2 YZ |
4566 | if (!rc) { |
4567 | err = -ENOMEM; | |
4568 | goto out; | |
4569 | } | |
4570 | ||
0b246afa | 4571 | rc->extent_root = fs_info->extent_root; |
5d4f98a2 YZ |
4572 | |
4573 | set_reloc_control(rc); | |
4574 | ||
7a7eaa40 | 4575 | trans = btrfs_join_transaction(rc->extent_root); |
3612b495 TI |
4576 | if (IS_ERR(trans)) { |
4577 | unset_reloc_control(rc); | |
4578 | err = PTR_ERR(trans); | |
4579 | goto out_free; | |
4580 | } | |
3fd0a558 YZ |
4581 | |
4582 | rc->merge_reloc_tree = 1; | |
4583 | ||
5d4f98a2 YZ |
4584 | while (!list_empty(&reloc_roots)) { |
4585 | reloc_root = list_entry(reloc_roots.next, | |
4586 | struct btrfs_root, root_list); | |
4587 | list_del(&reloc_root->root_list); | |
4588 | ||
4589 | if (btrfs_root_refs(&reloc_root->root_item) == 0) { | |
4590 | list_add_tail(&reloc_root->root_list, | |
4591 | &rc->reloc_roots); | |
4592 | continue; | |
4593 | } | |
4594 | ||
0b246afa | 4595 | fs_root = read_fs_root(fs_info, reloc_root->root_key.offset); |
79787eaa JM |
4596 | if (IS_ERR(fs_root)) { |
4597 | err = PTR_ERR(fs_root); | |
4598 | goto out_free; | |
4599 | } | |
5d4f98a2 | 4600 | |
ffd7b339 | 4601 | err = __add_reloc_root(reloc_root); |
79787eaa | 4602 | BUG_ON(err < 0); /* -ENOMEM or logic error */ |
5d4f98a2 YZ |
4603 | fs_root->reloc_root = reloc_root; |
4604 | } | |
4605 | ||
3a45bb20 | 4606 | err = btrfs_commit_transaction(trans); |
79787eaa JM |
4607 | if (err) |
4608 | goto out_free; | |
5d4f98a2 YZ |
4609 | |
4610 | merge_reloc_roots(rc); | |
4611 | ||
4612 | unset_reloc_control(rc); | |
4613 | ||
7a7eaa40 | 4614 | trans = btrfs_join_transaction(rc->extent_root); |
62b99540 | 4615 | if (IS_ERR(trans)) { |
3612b495 | 4616 | err = PTR_ERR(trans); |
62b99540 QW |
4617 | goto out_free; |
4618 | } | |
3a45bb20 | 4619 | err = btrfs_commit_transaction(trans); |
3612b495 | 4620 | out_free: |
3fd0a558 | 4621 | kfree(rc); |
3612b495 | 4622 | out: |
aca1bba6 LB |
4623 | if (!list_empty(&reloc_roots)) |
4624 | free_reloc_roots(&reloc_roots); | |
4625 | ||
5d4f98a2 YZ |
4626 | btrfs_free_path(path); |
4627 | ||
4628 | if (err == 0) { | |
4629 | /* cleanup orphan inode in data relocation tree */ | |
0b246afa | 4630 | fs_root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); |
5d4f98a2 YZ |
4631 | if (IS_ERR(fs_root)) |
4632 | err = PTR_ERR(fs_root); | |
d7ce5843 | 4633 | else |
66b4ffd1 | 4634 | err = btrfs_orphan_cleanup(fs_root); |
5d4f98a2 YZ |
4635 | } |
4636 | return err; | |
4637 | } | |
4638 | ||
4639 | /* | |
4640 | * helper to add ordered checksum for data relocation. | |
4641 | * | |
4642 | * cloning checksum properly handles the nodatasum extents. | |
4643 | * it also saves CPU time to re-calculate the checksum. | |
4644 | */ | |
4645 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) | |
4646 | { | |
0b246afa | 4647 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
5d4f98a2 | 4648 | struct btrfs_ordered_sum *sums; |
5d4f98a2 | 4649 | struct btrfs_ordered_extent *ordered; |
5d4f98a2 YZ |
4650 | int ret; |
4651 | u64 disk_bytenr; | |
4577b014 | 4652 | u64 new_bytenr; |
5d4f98a2 YZ |
4653 | LIST_HEAD(list); |
4654 | ||
4655 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); | |
4656 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); | |
4657 | ||
4658 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; | |
0b246afa | 4659 | ret = btrfs_lookup_csums_range(fs_info->csum_root, disk_bytenr, |
a2de733c | 4660 | disk_bytenr + len - 1, &list, 0); |
79787eaa JM |
4661 | if (ret) |
4662 | goto out; | |
5d4f98a2 YZ |
4663 | |
4664 | while (!list_empty(&list)) { | |
4665 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
4666 | list_del_init(&sums->list); | |
4667 | ||
4577b014 JB |
4668 | /* |
4669 | * We need to offset the new_bytenr based on where the csum is. | |
4670 | * We need to do this because we will read in entire prealloc | |
4671 | * extents but we may have written to say the middle of the | |
4672 | * prealloc extent, so we need to make sure the csum goes with | |
4673 | * the right disk offset. | |
4674 | * | |
4675 | * We can do this because the data reloc inode refers strictly | |
4676 | * to the on disk bytes, so we don't have to worry about | |
4677 | * disk_len vs real len like with real inodes since it's all | |
4678 | * disk length. | |
4679 | */ | |
4680 | new_bytenr = ordered->start + (sums->bytenr - disk_bytenr); | |
4681 | sums->bytenr = new_bytenr; | |
5d4f98a2 YZ |
4682 | |
4683 | btrfs_add_ordered_sum(inode, ordered, sums); | |
4684 | } | |
79787eaa | 4685 | out: |
5d4f98a2 | 4686 | btrfs_put_ordered_extent(ordered); |
411fc6bc | 4687 | return ret; |
5d4f98a2 | 4688 | } |
3fd0a558 | 4689 | |
83d4cfd4 JB |
4690 | int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, |
4691 | struct btrfs_root *root, struct extent_buffer *buf, | |
4692 | struct extent_buffer *cow) | |
3fd0a558 | 4693 | { |
0b246afa | 4694 | struct btrfs_fs_info *fs_info = root->fs_info; |
3fd0a558 YZ |
4695 | struct reloc_control *rc; |
4696 | struct backref_node *node; | |
4697 | int first_cow = 0; | |
4698 | int level; | |
83d4cfd4 | 4699 | int ret = 0; |
3fd0a558 | 4700 | |
0b246afa | 4701 | rc = fs_info->reloc_ctl; |
3fd0a558 | 4702 | if (!rc) |
83d4cfd4 | 4703 | return 0; |
3fd0a558 YZ |
4704 | |
4705 | BUG_ON(rc->stage == UPDATE_DATA_PTRS && | |
4706 | root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID); | |
4707 | ||
c974c464 WS |
4708 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { |
4709 | if (buf == root->node) | |
4710 | __update_reloc_root(root, cow->start); | |
4711 | } | |
4712 | ||
3fd0a558 YZ |
4713 | level = btrfs_header_level(buf); |
4714 | if (btrfs_header_generation(buf) <= | |
4715 | btrfs_root_last_snapshot(&root->root_item)) | |
4716 | first_cow = 1; | |
4717 | ||
4718 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && | |
4719 | rc->create_reloc_tree) { | |
4720 | WARN_ON(!first_cow && level == 0); | |
4721 | ||
4722 | node = rc->backref_cache.path[level]; | |
4723 | BUG_ON(node->bytenr != buf->start && | |
4724 | node->new_bytenr != buf->start); | |
4725 | ||
4726 | drop_node_buffer(node); | |
4727 | extent_buffer_get(cow); | |
4728 | node->eb = cow; | |
4729 | node->new_bytenr = cow->start; | |
4730 | ||
4731 | if (!node->pending) { | |
4732 | list_move_tail(&node->list, | |
4733 | &rc->backref_cache.pending[level]); | |
4734 | node->pending = 1; | |
4735 | } | |
4736 | ||
4737 | if (first_cow) | |
4738 | __mark_block_processed(rc, node); | |
4739 | ||
4740 | if (first_cow && level > 0) | |
4741 | rc->nodes_relocated += buf->len; | |
4742 | } | |
4743 | ||
83d4cfd4 | 4744 | if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS) |
3fd0a558 | 4745 | ret = replace_file_extents(trans, rc, root, cow); |
83d4cfd4 | 4746 | return ret; |
3fd0a558 YZ |
4747 | } |
4748 | ||
4749 | /* | |
4750 | * called before creating snapshot. it calculates metadata reservation | |
01327610 | 4751 | * required for relocating tree blocks in the snapshot |
3fd0a558 | 4752 | */ |
147d256e | 4753 | void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, |
3fd0a558 YZ |
4754 | u64 *bytes_to_reserve) |
4755 | { | |
4756 | struct btrfs_root *root; | |
4757 | struct reloc_control *rc; | |
4758 | ||
4759 | root = pending->root; | |
4760 | if (!root->reloc_root) | |
4761 | return; | |
4762 | ||
4763 | rc = root->fs_info->reloc_ctl; | |
4764 | if (!rc->merge_reloc_tree) | |
4765 | return; | |
4766 | ||
4767 | root = root->reloc_root; | |
4768 | BUG_ON(btrfs_root_refs(&root->root_item) == 0); | |
4769 | /* | |
4770 | * relocation is in the stage of merging trees. the space | |
4771 | * used by merging a reloc tree is twice the size of | |
4772 | * relocated tree nodes in the worst case. half for cowing | |
4773 | * the reloc tree, half for cowing the fs tree. the space | |
4774 | * used by cowing the reloc tree will be freed after the | |
4775 | * tree is dropped. if we create snapshot, cowing the fs | |
4776 | * tree may use more space than it frees. so we need | |
4777 | * reserve extra space. | |
4778 | */ | |
4779 | *bytes_to_reserve += rc->nodes_relocated; | |
4780 | } | |
4781 | ||
4782 | /* | |
4783 | * called after snapshot is created. migrate block reservation | |
4784 | * and create reloc root for the newly created snapshot | |
4785 | */ | |
49b25e05 | 4786 | int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, |
3fd0a558 YZ |
4787 | struct btrfs_pending_snapshot *pending) |
4788 | { | |
4789 | struct btrfs_root *root = pending->root; | |
4790 | struct btrfs_root *reloc_root; | |
4791 | struct btrfs_root *new_root; | |
4792 | struct reloc_control *rc; | |
4793 | int ret; | |
4794 | ||
4795 | if (!root->reloc_root) | |
49b25e05 | 4796 | return 0; |
3fd0a558 YZ |
4797 | |
4798 | rc = root->fs_info->reloc_ctl; | |
4799 | rc->merging_rsv_size += rc->nodes_relocated; | |
4800 | ||
4801 | if (rc->merge_reloc_tree) { | |
4802 | ret = btrfs_block_rsv_migrate(&pending->block_rsv, | |
4803 | rc->block_rsv, | |
25d609f8 | 4804 | rc->nodes_relocated, 1); |
49b25e05 JM |
4805 | if (ret) |
4806 | return ret; | |
3fd0a558 YZ |
4807 | } |
4808 | ||
4809 | new_root = pending->snap; | |
4810 | reloc_root = create_reloc_root(trans, root->reloc_root, | |
4811 | new_root->root_key.objectid); | |
49b25e05 JM |
4812 | if (IS_ERR(reloc_root)) |
4813 | return PTR_ERR(reloc_root); | |
3fd0a558 | 4814 | |
ffd7b339 JM |
4815 | ret = __add_reloc_root(reloc_root); |
4816 | BUG_ON(ret < 0); | |
3fd0a558 YZ |
4817 | new_root->reloc_root = reloc_root; |
4818 | ||
49b25e05 | 4819 | if (rc->create_reloc_tree) |
3fd0a558 | 4820 | ret = clone_backref_node(trans, rc, root, reloc_root); |
49b25e05 | 4821 | return ret; |
3fd0a558 | 4822 | } |