2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #define _XOPEN_SOURCE 500
25 #include <sys/types.h>
29 #include <uuid/uuid.h>
34 #include "print-tree.h"
35 #include "transaction.h"
39 #include "free-space-cache.h"
41 #include "qgroup-verify.h"
43 static u64 bytes_used = 0;
44 static u64 total_csum_bytes = 0;
45 static u64 total_btree_bytes = 0;
46 static u64 total_fs_tree_bytes = 0;
47 static u64 total_extent_tree_bytes = 0;
48 static u64 btree_space_waste = 0;
49 static u64 data_bytes_allocated = 0;
50 static u64 data_bytes_referenced = 0;
51 static int found_old_backref = 0;
52 static LIST_HEAD(duplicate_extents);
53 static LIST_HEAD(delete_items);
54 static int repair = 0;
55 static int no_holes = 0;
56 static int init_extent_tree = 0;
57 static int check_data_csum = 0;
59 struct extent_backref {
60 struct list_head list;
61 unsigned int is_data:1;
62 unsigned int found_extent_tree:1;
63 unsigned int full_backref:1;
64 unsigned int found_ref:1;
65 unsigned int broken:1;
69 struct extent_backref node;
84 struct extent_backref node;
91 struct extent_record {
92 struct list_head backrefs;
93 struct list_head dups;
94 struct list_head list;
95 struct cache_extent cache;
96 struct btrfs_disk_key parent_key;
101 u64 extent_item_refs;
103 u64 parent_generation;
107 unsigned int found_rec:1;
108 unsigned int content_checked:1;
109 unsigned int owner_ref_checked:1;
110 unsigned int is_root:1;
111 unsigned int metadata:1;
114 struct inode_backref {
115 struct list_head list;
116 unsigned int found_dir_item:1;
117 unsigned int found_dir_index:1;
118 unsigned int found_inode_ref:1;
119 unsigned int filetype:8;
121 unsigned int ref_type;
128 struct dropping_root_item_record {
129 struct list_head list;
130 struct btrfs_root_item ri;
131 struct btrfs_key found_key;
134 #define REF_ERR_NO_DIR_ITEM (1 << 0)
135 #define REF_ERR_NO_DIR_INDEX (1 << 1)
136 #define REF_ERR_NO_INODE_REF (1 << 2)
137 #define REF_ERR_DUP_DIR_ITEM (1 << 3)
138 #define REF_ERR_DUP_DIR_INDEX (1 << 4)
139 #define REF_ERR_DUP_INODE_REF (1 << 5)
140 #define REF_ERR_INDEX_UNMATCH (1 << 6)
141 #define REF_ERR_FILETYPE_UNMATCH (1 << 7)
142 #define REF_ERR_NAME_TOO_LONG (1 << 8) // 100
143 #define REF_ERR_NO_ROOT_REF (1 << 9)
144 #define REF_ERR_NO_ROOT_BACKREF (1 << 10)
145 #define REF_ERR_DUP_ROOT_REF (1 << 11)
146 #define REF_ERR_DUP_ROOT_BACKREF (1 << 12)
148 struct inode_record {
149 struct list_head backrefs;
150 unsigned int checked:1;
151 unsigned int merging:1;
152 unsigned int found_inode_item:1;
153 unsigned int found_dir_item:1;
154 unsigned int found_file_extent:1;
155 unsigned int found_csum_item:1;
156 unsigned int some_csum_missing:1;
157 unsigned int nodatasum:1;
170 u64 first_extent_gap;
175 #define I_ERR_NO_INODE_ITEM (1 << 0)
176 #define I_ERR_NO_ORPHAN_ITEM (1 << 1)
177 #define I_ERR_DUP_INODE_ITEM (1 << 2)
178 #define I_ERR_DUP_DIR_INDEX (1 << 3)
179 #define I_ERR_ODD_DIR_ITEM (1 << 4)
180 #define I_ERR_ODD_FILE_EXTENT (1 << 5)
181 #define I_ERR_BAD_FILE_EXTENT (1 << 6)
182 #define I_ERR_FILE_EXTENT_OVERLAP (1 << 7)
183 #define I_ERR_FILE_EXTENT_DISCOUNT (1 << 8) // 100
184 #define I_ERR_DIR_ISIZE_WRONG (1 << 9)
185 #define I_ERR_FILE_NBYTES_WRONG (1 << 10) // 400
186 #define I_ERR_ODD_CSUM_ITEM (1 << 11)
187 #define I_ERR_SOME_CSUM_MISSING (1 << 12)
188 #define I_ERR_LINK_COUNT_WRONG (1 << 13)
190 struct root_backref {
191 struct list_head list;
192 unsigned int found_dir_item:1;
193 unsigned int found_dir_index:1;
194 unsigned int found_back_ref:1;
195 unsigned int found_forward_ref:1;
196 unsigned int reachable:1;
206 struct list_head backrefs;
207 struct cache_extent cache;
208 unsigned int found_root_item:1;
214 struct cache_extent cache;
219 struct cache_extent cache;
220 struct cache_tree root_cache;
221 struct cache_tree inode_cache;
222 struct inode_record *current;
231 struct walk_control {
232 struct cache_tree shared;
233 struct shared_node *nodes[BTRFS_MAX_LEVEL];
239 struct btrfs_key key;
241 struct list_head list;
244 static void reset_cached_block_groups(struct btrfs_fs_info *fs_info);
246 static void record_root_in_trans(struct btrfs_trans_handle *trans,
247 struct btrfs_root *root)
249 if (root->last_trans != trans->transid) {
250 root->track_dirty = 1;
251 root->last_trans = trans->transid;
252 root->commit_root = root->node;
253 extent_buffer_get(root->node);
257 static u8 imode_to_type(u32 imode)
260 static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
261 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
262 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
263 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
264 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
265 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
266 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
267 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
270 return btrfs_type_by_mode[(imode & S_IFMT) >> S_SHIFT];
274 static int device_record_compare(struct rb_node *node1, struct rb_node *node2)
276 struct device_record *rec1;
277 struct device_record *rec2;
279 rec1 = rb_entry(node1, struct device_record, node);
280 rec2 = rb_entry(node2, struct device_record, node);
281 if (rec1->devid > rec2->devid)
283 else if (rec1->devid < rec2->devid)
289 static struct inode_record *clone_inode_rec(struct inode_record *orig_rec)
291 struct inode_record *rec;
292 struct inode_backref *backref;
293 struct inode_backref *orig;
296 rec = malloc(sizeof(*rec));
297 memcpy(rec, orig_rec, sizeof(*rec));
299 INIT_LIST_HEAD(&rec->backrefs);
301 list_for_each_entry(orig, &orig_rec->backrefs, list) {
302 size = sizeof(*orig) + orig->namelen + 1;
303 backref = malloc(size);
304 memcpy(backref, orig, size);
305 list_add_tail(&backref->list, &rec->backrefs);
310 static void print_inode_error(int errors)
312 if (errors & I_ERR_NO_INODE_ITEM)
313 fprintf(stderr, ", no inode item");
314 if (errors & I_ERR_NO_ORPHAN_ITEM)
315 fprintf(stderr, ", no orphan item");
316 if (errors & I_ERR_DUP_INODE_ITEM)
317 fprintf(stderr, ", dup inode item");
318 if (errors & I_ERR_DUP_DIR_INDEX)
319 fprintf(stderr, ", dup dir index");
320 if (errors & I_ERR_ODD_DIR_ITEM)
321 fprintf(stderr, ", odd dir item");
322 if (errors & I_ERR_ODD_FILE_EXTENT)
323 fprintf(stderr, ", odd file extent");
324 if (errors & I_ERR_BAD_FILE_EXTENT)
325 fprintf(stderr, ", bad file extent");
326 if (errors & I_ERR_FILE_EXTENT_OVERLAP)
327 fprintf(stderr, ", file extent overlap");
328 if (errors & I_ERR_FILE_EXTENT_DISCOUNT)
329 fprintf(stderr, ", file extent discount");
330 if (errors & I_ERR_DIR_ISIZE_WRONG)
331 fprintf(stderr, ", dir isize wrong");
332 if (errors & I_ERR_FILE_NBYTES_WRONG)
333 fprintf(stderr, ", nbytes wrong");
334 if (errors & I_ERR_ODD_CSUM_ITEM)
335 fprintf(stderr, ", odd csum item");
336 if (errors & I_ERR_SOME_CSUM_MISSING)
337 fprintf(stderr, ", some csum missing");
338 if (errors & I_ERR_LINK_COUNT_WRONG)
339 fprintf(stderr, ", link count wrong");
340 fprintf(stderr, "\n");
343 static void print_ref_error(int errors)
345 if (errors & REF_ERR_NO_DIR_ITEM)
346 fprintf(stderr, ", no dir item");
347 if (errors & REF_ERR_NO_DIR_INDEX)
348 fprintf(stderr, ", no dir index");
349 if (errors & REF_ERR_NO_INODE_REF)
350 fprintf(stderr, ", no inode ref");
351 if (errors & REF_ERR_DUP_DIR_ITEM)
352 fprintf(stderr, ", dup dir item");
353 if (errors & REF_ERR_DUP_DIR_INDEX)
354 fprintf(stderr, ", dup dir index");
355 if (errors & REF_ERR_DUP_INODE_REF)
356 fprintf(stderr, ", dup inode ref");
357 if (errors & REF_ERR_INDEX_UNMATCH)
358 fprintf(stderr, ", index unmatch");
359 if (errors & REF_ERR_FILETYPE_UNMATCH)
360 fprintf(stderr, ", filetype unmatch");
361 if (errors & REF_ERR_NAME_TOO_LONG)
362 fprintf(stderr, ", name too long");
363 if (errors & REF_ERR_NO_ROOT_REF)
364 fprintf(stderr, ", no root ref");
365 if (errors & REF_ERR_NO_ROOT_BACKREF)
366 fprintf(stderr, ", no root backref");
367 if (errors & REF_ERR_DUP_ROOT_REF)
368 fprintf(stderr, ", dup root ref");
369 if (errors & REF_ERR_DUP_ROOT_BACKREF)
370 fprintf(stderr, ", dup root backref");
371 fprintf(stderr, "\n");
374 static struct inode_record *get_inode_rec(struct cache_tree *inode_cache,
377 struct ptr_node *node;
378 struct cache_extent *cache;
379 struct inode_record *rec = NULL;
382 cache = lookup_cache_extent(inode_cache, ino, 1);
384 node = container_of(cache, struct ptr_node, cache);
386 if (mod && rec->refs > 1) {
387 node->data = clone_inode_rec(rec);
392 rec = calloc(1, sizeof(*rec));
394 rec->extent_start = (u64)-1;
395 rec->first_extent_gap = (u64)-1;
397 INIT_LIST_HEAD(&rec->backrefs);
399 node = malloc(sizeof(*node));
400 node->cache.start = ino;
401 node->cache.size = 1;
404 if (ino == BTRFS_FREE_INO_OBJECTID)
407 ret = insert_cache_extent(inode_cache, &node->cache);
413 static void free_inode_rec(struct inode_record *rec)
415 struct inode_backref *backref;
420 while (!list_empty(&rec->backrefs)) {
421 backref = list_entry(rec->backrefs.next,
422 struct inode_backref, list);
423 list_del(&backref->list);
429 static int can_free_inode_rec(struct inode_record *rec)
431 if (!rec->errors && rec->checked && rec->found_inode_item &&
432 rec->nlink == rec->found_link && list_empty(&rec->backrefs))
437 static void maybe_free_inode_rec(struct cache_tree *inode_cache,
438 struct inode_record *rec)
440 struct cache_extent *cache;
441 struct inode_backref *tmp, *backref;
442 struct ptr_node *node;
443 unsigned char filetype;
445 if (!rec->found_inode_item)
448 filetype = imode_to_type(rec->imode);
449 list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) {
450 if (backref->found_dir_item && backref->found_dir_index) {
451 if (backref->filetype != filetype)
452 backref->errors |= REF_ERR_FILETYPE_UNMATCH;
453 if (!backref->errors && backref->found_inode_ref) {
454 list_del(&backref->list);
460 if (!rec->checked || rec->merging)
463 if (S_ISDIR(rec->imode)) {
464 if (rec->found_size != rec->isize)
465 rec->errors |= I_ERR_DIR_ISIZE_WRONG;
466 if (rec->found_file_extent)
467 rec->errors |= I_ERR_ODD_FILE_EXTENT;
468 } else if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) {
469 if (rec->found_dir_item)
470 rec->errors |= I_ERR_ODD_DIR_ITEM;
471 if (rec->found_size != rec->nbytes)
472 rec->errors |= I_ERR_FILE_NBYTES_WRONG;
473 if (rec->extent_start == (u64)-1 || rec->extent_start > 0)
474 rec->first_extent_gap = 0;
475 if (rec->nlink > 0 && !no_holes &&
476 (rec->extent_end < rec->isize ||
477 rec->first_extent_gap < rec->isize))
478 rec->errors |= I_ERR_FILE_EXTENT_DISCOUNT;
481 if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) {
482 if (rec->found_csum_item && rec->nodatasum)
483 rec->errors |= I_ERR_ODD_CSUM_ITEM;
484 if (rec->some_csum_missing && !rec->nodatasum)
485 rec->errors |= I_ERR_SOME_CSUM_MISSING;
488 BUG_ON(rec->refs != 1);
489 if (can_free_inode_rec(rec)) {
490 cache = lookup_cache_extent(inode_cache, rec->ino, 1);
491 node = container_of(cache, struct ptr_node, cache);
492 BUG_ON(node->data != rec);
493 remove_cache_extent(inode_cache, &node->cache);
499 static int check_orphan_item(struct btrfs_root *root, u64 ino)
501 struct btrfs_path path;
502 struct btrfs_key key;
505 key.objectid = BTRFS_ORPHAN_OBJECTID;
506 key.type = BTRFS_ORPHAN_ITEM_KEY;
509 btrfs_init_path(&path);
510 ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
511 btrfs_release_path(&path);
517 static int process_inode_item(struct extent_buffer *eb,
518 int slot, struct btrfs_key *key,
519 struct shared_node *active_node)
521 struct inode_record *rec;
522 struct btrfs_inode_item *item;
524 rec = active_node->current;
525 BUG_ON(rec->ino != key->objectid || rec->refs > 1);
526 if (rec->found_inode_item) {
527 rec->errors |= I_ERR_DUP_INODE_ITEM;
530 item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item);
531 rec->nlink = btrfs_inode_nlink(eb, item);
532 rec->isize = btrfs_inode_size(eb, item);
533 rec->nbytes = btrfs_inode_nbytes(eb, item);
534 rec->imode = btrfs_inode_mode(eb, item);
535 if (btrfs_inode_flags(eb, item) & BTRFS_INODE_NODATASUM)
537 rec->found_inode_item = 1;
539 rec->errors |= I_ERR_NO_ORPHAN_ITEM;
540 maybe_free_inode_rec(&active_node->inode_cache, rec);
544 static struct inode_backref *get_inode_backref(struct inode_record *rec,
546 int namelen, u64 dir)
548 struct inode_backref *backref;
550 list_for_each_entry(backref, &rec->backrefs, list) {
551 if (backref->dir != dir || backref->namelen != namelen)
553 if (memcmp(name, backref->name, namelen))
558 backref = malloc(sizeof(*backref) + namelen + 1);
559 memset(backref, 0, sizeof(*backref));
561 backref->namelen = namelen;
562 memcpy(backref->name, name, namelen);
563 backref->name[namelen] = '\0';
564 list_add_tail(&backref->list, &rec->backrefs);
568 static int add_inode_backref(struct cache_tree *inode_cache,
569 u64 ino, u64 dir, u64 index,
570 const char *name, int namelen,
571 int filetype, int itemtype, int errors)
573 struct inode_record *rec;
574 struct inode_backref *backref;
576 rec = get_inode_rec(inode_cache, ino, 1);
577 backref = get_inode_backref(rec, name, namelen, dir);
579 backref->errors |= errors;
580 if (itemtype == BTRFS_DIR_INDEX_KEY) {
581 if (backref->found_dir_index)
582 backref->errors |= REF_ERR_DUP_DIR_INDEX;
583 if (backref->found_inode_ref && backref->index != index)
584 backref->errors |= REF_ERR_INDEX_UNMATCH;
585 if (backref->found_dir_item && backref->filetype != filetype)
586 backref->errors |= REF_ERR_FILETYPE_UNMATCH;
588 backref->index = index;
589 backref->filetype = filetype;
590 backref->found_dir_index = 1;
591 } else if (itemtype == BTRFS_DIR_ITEM_KEY) {
593 if (backref->found_dir_item)
594 backref->errors |= REF_ERR_DUP_DIR_ITEM;
595 if (backref->found_dir_index && backref->filetype != filetype)
596 backref->errors |= REF_ERR_FILETYPE_UNMATCH;
598 backref->filetype = filetype;
599 backref->found_dir_item = 1;
600 } else if ((itemtype == BTRFS_INODE_REF_KEY) ||
601 (itemtype == BTRFS_INODE_EXTREF_KEY)) {
602 if (backref->found_inode_ref)
603 backref->errors |= REF_ERR_DUP_INODE_REF;
604 if (backref->found_dir_index && backref->index != index)
605 backref->errors |= REF_ERR_INDEX_UNMATCH;
607 backref->ref_type = itemtype;
608 backref->index = index;
609 backref->found_inode_ref = 1;
614 maybe_free_inode_rec(inode_cache, rec);
618 static int merge_inode_recs(struct inode_record *src, struct inode_record *dst,
619 struct cache_tree *dst_cache)
621 struct inode_backref *backref;
625 list_for_each_entry(backref, &src->backrefs, list) {
626 if (backref->found_dir_index) {
627 add_inode_backref(dst_cache, dst->ino, backref->dir,
628 backref->index, backref->name,
629 backref->namelen, backref->filetype,
630 BTRFS_DIR_INDEX_KEY, backref->errors);
632 if (backref->found_dir_item) {
634 add_inode_backref(dst_cache, dst->ino,
635 backref->dir, 0, backref->name,
636 backref->namelen, backref->filetype,
637 BTRFS_DIR_ITEM_KEY, backref->errors);
639 if (backref->found_inode_ref) {
640 add_inode_backref(dst_cache, dst->ino,
641 backref->dir, backref->index,
642 backref->name, backref->namelen, 0,
643 backref->ref_type, backref->errors);
647 if (src->found_dir_item)
648 dst->found_dir_item = 1;
649 if (src->found_file_extent)
650 dst->found_file_extent = 1;
651 if (src->found_csum_item)
652 dst->found_csum_item = 1;
653 if (src->some_csum_missing)
654 dst->some_csum_missing = 1;
655 if (dst->first_extent_gap > src->first_extent_gap)
656 dst->first_extent_gap = src->first_extent_gap;
658 BUG_ON(src->found_link < dir_count);
659 dst->found_link += src->found_link - dir_count;
660 dst->found_size += src->found_size;
661 if (src->extent_start != (u64)-1) {
662 if (dst->extent_start == (u64)-1) {
663 dst->extent_start = src->extent_start;
664 dst->extent_end = src->extent_end;
666 if (dst->extent_end > src->extent_start)
667 dst->errors |= I_ERR_FILE_EXTENT_OVERLAP;
668 else if (dst->extent_end < src->extent_start &&
669 dst->extent_end < dst->first_extent_gap)
670 dst->first_extent_gap = dst->extent_end;
671 if (dst->extent_end < src->extent_end)
672 dst->extent_end = src->extent_end;
676 dst->errors |= src->errors;
677 if (src->found_inode_item) {
678 if (!dst->found_inode_item) {
679 dst->nlink = src->nlink;
680 dst->isize = src->isize;
681 dst->nbytes = src->nbytes;
682 dst->imode = src->imode;
683 dst->nodatasum = src->nodatasum;
684 dst->found_inode_item = 1;
686 dst->errors |= I_ERR_DUP_INODE_ITEM;
694 static int splice_shared_node(struct shared_node *src_node,
695 struct shared_node *dst_node)
697 struct cache_extent *cache;
698 struct ptr_node *node, *ins;
699 struct cache_tree *src, *dst;
700 struct inode_record *rec, *conflict;
705 if (--src_node->refs == 0)
707 if (src_node->current)
708 current_ino = src_node->current->ino;
710 src = &src_node->root_cache;
711 dst = &dst_node->root_cache;
713 cache = search_cache_extent(src, 0);
715 node = container_of(cache, struct ptr_node, cache);
717 cache = next_cache_extent(cache);
720 remove_cache_extent(src, &node->cache);
723 ins = malloc(sizeof(*ins));
724 ins->cache.start = node->cache.start;
725 ins->cache.size = node->cache.size;
729 ret = insert_cache_extent(dst, &ins->cache);
730 if (ret == -EEXIST) {
731 conflict = get_inode_rec(dst, rec->ino, 1);
732 merge_inode_recs(rec, conflict, dst);
734 conflict->checked = 1;
735 if (dst_node->current == conflict)
736 dst_node->current = NULL;
738 maybe_free_inode_rec(dst, conflict);
746 if (src == &src_node->root_cache) {
747 src = &src_node->inode_cache;
748 dst = &dst_node->inode_cache;
752 if (current_ino > 0 && (!dst_node->current ||
753 current_ino > dst_node->current->ino)) {
754 if (dst_node->current) {
755 dst_node->current->checked = 1;
756 maybe_free_inode_rec(dst, dst_node->current);
758 dst_node->current = get_inode_rec(dst, current_ino, 1);
763 static void free_inode_ptr(struct cache_extent *cache)
765 struct ptr_node *node;
766 struct inode_record *rec;
768 node = container_of(cache, struct ptr_node, cache);
774 FREE_EXTENT_CACHE_BASED_TREE(inode_recs, free_inode_ptr);
776 static struct shared_node *find_shared_node(struct cache_tree *shared,
779 struct cache_extent *cache;
780 struct shared_node *node;
782 cache = lookup_cache_extent(shared, bytenr, 1);
784 node = container_of(cache, struct shared_node, cache);
790 static int add_shared_node(struct cache_tree *shared, u64 bytenr, u32 refs)
793 struct shared_node *node;
795 node = calloc(1, sizeof(*node));
796 node->cache.start = bytenr;
797 node->cache.size = 1;
798 cache_tree_init(&node->root_cache);
799 cache_tree_init(&node->inode_cache);
802 ret = insert_cache_extent(shared, &node->cache);
807 static int enter_shared_node(struct btrfs_root *root, u64 bytenr, u32 refs,
808 struct walk_control *wc, int level)
810 struct shared_node *node;
811 struct shared_node *dest;
813 if (level == wc->active_node)
816 BUG_ON(wc->active_node <= level);
817 node = find_shared_node(&wc->shared, bytenr);
819 add_shared_node(&wc->shared, bytenr, refs);
820 node = find_shared_node(&wc->shared, bytenr);
821 wc->nodes[level] = node;
822 wc->active_node = level;
826 if (wc->root_level == wc->active_node &&
827 btrfs_root_refs(&root->root_item) == 0) {
828 if (--node->refs == 0) {
829 free_inode_recs_tree(&node->root_cache);
830 free_inode_recs_tree(&node->inode_cache);
831 remove_cache_extent(&wc->shared, &node->cache);
837 dest = wc->nodes[wc->active_node];
838 splice_shared_node(node, dest);
839 if (node->refs == 0) {
840 remove_cache_extent(&wc->shared, &node->cache);
846 static int leave_shared_node(struct btrfs_root *root,
847 struct walk_control *wc, int level)
849 struct shared_node *node;
850 struct shared_node *dest;
853 if (level == wc->root_level)
856 for (i = level + 1; i < BTRFS_MAX_LEVEL; i++) {
860 BUG_ON(i >= BTRFS_MAX_LEVEL);
862 node = wc->nodes[wc->active_node];
863 wc->nodes[wc->active_node] = NULL;
866 dest = wc->nodes[wc->active_node];
867 if (wc->active_node < wc->root_level ||
868 btrfs_root_refs(&root->root_item) > 0) {
869 BUG_ON(node->refs <= 1);
870 splice_shared_node(node, dest);
872 BUG_ON(node->refs < 2);
878 static int is_child_root(struct btrfs_root *root, u64 parent_root_id,
881 struct btrfs_path path;
882 struct btrfs_key key;
883 struct extent_buffer *leaf;
887 btrfs_init_path(&path);
889 key.objectid = parent_root_id;
890 key.type = BTRFS_ROOT_REF_KEY;
891 key.offset = child_root_id;
892 ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path,
895 btrfs_release_path(&path);
899 key.objectid = child_root_id;
900 key.type = BTRFS_ROOT_BACKREF_KEY;
902 ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path,
907 leaf = path.nodes[0];
908 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
909 ret = btrfs_next_leaf(root->fs_info->tree_root, &path);
914 leaf = path.nodes[0];
917 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
918 if (key.objectid != child_root_id ||
919 key.type != BTRFS_ROOT_BACKREF_KEY)
924 if (key.offset == parent_root_id) {
925 btrfs_release_path(&path);
932 btrfs_release_path(&path);
933 return has_parent? 0 : -1;
936 static int process_dir_item(struct btrfs_root *root,
937 struct extent_buffer *eb,
938 int slot, struct btrfs_key *key,
939 struct shared_node *active_node)
949 struct btrfs_dir_item *di;
950 struct inode_record *rec;
951 struct cache_tree *root_cache;
952 struct cache_tree *inode_cache;
953 struct btrfs_key location;
954 char namebuf[BTRFS_NAME_LEN];
956 root_cache = &active_node->root_cache;
957 inode_cache = &active_node->inode_cache;
958 rec = active_node->current;
959 rec->found_dir_item = 1;
961 di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
962 total = btrfs_item_size_nr(eb, slot);
963 while (cur < total) {
965 btrfs_dir_item_key_to_cpu(eb, di, &location);
966 name_len = btrfs_dir_name_len(eb, di);
967 data_len = btrfs_dir_data_len(eb, di);
968 filetype = btrfs_dir_type(eb, di);
970 rec->found_size += name_len;
971 if (name_len <= BTRFS_NAME_LEN) {
975 len = BTRFS_NAME_LEN;
976 error = REF_ERR_NAME_TOO_LONG;
978 read_extent_buffer(eb, namebuf, (unsigned long)(di + 1), len);
980 if (location.type == BTRFS_INODE_ITEM_KEY) {
981 add_inode_backref(inode_cache, location.objectid,
982 key->objectid, key->offset, namebuf,
983 len, filetype, key->type, error);
984 } else if (location.type == BTRFS_ROOT_ITEM_KEY) {
985 add_inode_backref(root_cache, location.objectid,
986 key->objectid, key->offset,
987 namebuf, len, filetype,
990 fprintf(stderr, "warning line %d\n", __LINE__);
993 len = sizeof(*di) + name_len + data_len;
994 di = (struct btrfs_dir_item *)((char *)di + len);
997 if (key->type == BTRFS_DIR_INDEX_KEY && nritems > 1)
998 rec->errors |= I_ERR_DUP_DIR_INDEX;
1003 static int process_inode_ref(struct extent_buffer *eb,
1004 int slot, struct btrfs_key *key,
1005 struct shared_node *active_node)
1013 struct cache_tree *inode_cache;
1014 struct btrfs_inode_ref *ref;
1015 char namebuf[BTRFS_NAME_LEN];
1017 inode_cache = &active_node->inode_cache;
1019 ref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref);
1020 total = btrfs_item_size_nr(eb, slot);
1021 while (cur < total) {
1022 name_len = btrfs_inode_ref_name_len(eb, ref);
1023 index = btrfs_inode_ref_index(eb, ref);
1024 if (name_len <= BTRFS_NAME_LEN) {
1028 len = BTRFS_NAME_LEN;
1029 error = REF_ERR_NAME_TOO_LONG;
1031 read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len);
1032 add_inode_backref(inode_cache, key->objectid, key->offset,
1033 index, namebuf, len, 0, key->type, error);
1035 len = sizeof(*ref) + name_len;
1036 ref = (struct btrfs_inode_ref *)((char *)ref + len);
1042 static int process_inode_extref(struct extent_buffer *eb,
1043 int slot, struct btrfs_key *key,
1044 struct shared_node *active_node)
1053 struct cache_tree *inode_cache;
1054 struct btrfs_inode_extref *extref;
1055 char namebuf[BTRFS_NAME_LEN];
1057 inode_cache = &active_node->inode_cache;
1059 extref = btrfs_item_ptr(eb, slot, struct btrfs_inode_extref);
1060 total = btrfs_item_size_nr(eb, slot);
1061 while (cur < total) {
1062 name_len = btrfs_inode_extref_name_len(eb, extref);
1063 index = btrfs_inode_extref_index(eb, extref);
1064 parent = btrfs_inode_extref_parent(eb, extref);
1065 if (name_len <= BTRFS_NAME_LEN) {
1069 len = BTRFS_NAME_LEN;
1070 error = REF_ERR_NAME_TOO_LONG;
1072 read_extent_buffer(eb, namebuf,
1073 (unsigned long)(extref + 1), len);
1074 add_inode_backref(inode_cache, key->objectid, parent,
1075 index, namebuf, len, 0, key->type, error);
1077 len = sizeof(*extref) + name_len;
1078 extref = (struct btrfs_inode_extref *)((char *)extref + len);
1085 static u64 count_csum_range(struct btrfs_root *root, u64 start, u64 len)
1087 struct btrfs_key key;
1088 struct btrfs_path path;
1089 struct extent_buffer *leaf;
1094 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
1096 btrfs_init_path(&path);
1098 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
1100 key.type = BTRFS_EXTENT_CSUM_KEY;
1102 ret = btrfs_search_slot(NULL, root->fs_info->csum_root,
1105 if (ret > 0 && path.slots[0] > 0) {
1106 leaf = path.nodes[0];
1107 btrfs_item_key_to_cpu(leaf, &key, path.slots[0] - 1);
1108 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
1109 key.type == BTRFS_EXTENT_CSUM_KEY)
1114 leaf = path.nodes[0];
1115 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1116 ret = btrfs_next_leaf(root->fs_info->csum_root, &path);
1120 leaf = path.nodes[0];
1123 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1124 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
1125 key.type != BTRFS_EXTENT_CSUM_KEY)
1128 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1129 if (key.offset >= start + len)
1132 if (key.offset > start)
1135 size = btrfs_item_size_nr(leaf, path.slots[0]);
1136 csum_end = key.offset + (size / csum_size) * root->sectorsize;
1137 if (csum_end > start) {
1138 size = min(csum_end - start, len);
1146 btrfs_release_path(&path);
1150 static int process_file_extent(struct btrfs_root *root,
1151 struct extent_buffer *eb,
1152 int slot, struct btrfs_key *key,
1153 struct shared_node *active_node)
1155 struct inode_record *rec;
1156 struct btrfs_file_extent_item *fi;
1158 u64 disk_bytenr = 0;
1159 u64 extent_offset = 0;
1160 u64 mask = root->sectorsize - 1;
1163 rec = active_node->current;
1164 BUG_ON(rec->ino != key->objectid || rec->refs > 1);
1165 rec->found_file_extent = 1;
1167 if (rec->extent_start == (u64)-1) {
1168 rec->extent_start = key->offset;
1169 rec->extent_end = key->offset;
1172 if (rec->extent_end > key->offset)
1173 rec->errors |= I_ERR_FILE_EXTENT_OVERLAP;
1174 else if (rec->extent_end < key->offset &&
1175 rec->extent_end < rec->first_extent_gap)
1176 rec->first_extent_gap = rec->extent_end;
1178 fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item);
1179 extent_type = btrfs_file_extent_type(eb, fi);
1181 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1182 num_bytes = btrfs_file_extent_inline_len(eb, slot, fi);
1184 rec->errors |= I_ERR_BAD_FILE_EXTENT;
1185 rec->found_size += num_bytes;
1186 num_bytes = (num_bytes + mask) & ~mask;
1187 } else if (extent_type == BTRFS_FILE_EXTENT_REG ||
1188 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1189 num_bytes = btrfs_file_extent_num_bytes(eb, fi);
1190 disk_bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
1191 extent_offset = btrfs_file_extent_offset(eb, fi);
1192 if (num_bytes == 0 || (num_bytes & mask))
1193 rec->errors |= I_ERR_BAD_FILE_EXTENT;
1194 if (num_bytes + extent_offset >
1195 btrfs_file_extent_ram_bytes(eb, fi))
1196 rec->errors |= I_ERR_BAD_FILE_EXTENT;
1197 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC &&
1198 (btrfs_file_extent_compression(eb, fi) ||
1199 btrfs_file_extent_encryption(eb, fi) ||
1200 btrfs_file_extent_other_encoding(eb, fi)))
1201 rec->errors |= I_ERR_BAD_FILE_EXTENT;
1202 if (disk_bytenr > 0)
1203 rec->found_size += num_bytes;
1205 rec->errors |= I_ERR_BAD_FILE_EXTENT;
1207 rec->extent_end = key->offset + num_bytes;
1209 if (disk_bytenr > 0) {
1211 if (btrfs_file_extent_compression(eb, fi))
1212 num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
1214 disk_bytenr += extent_offset;
1216 found = count_csum_range(root, disk_bytenr, num_bytes);
1217 if (extent_type == BTRFS_FILE_EXTENT_REG) {
1219 rec->found_csum_item = 1;
1220 if (found < num_bytes)
1221 rec->some_csum_missing = 1;
1222 } else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1224 rec->errors |= I_ERR_ODD_CSUM_ITEM;
1230 static int process_one_leaf(struct btrfs_root *root, struct extent_buffer *eb,
1231 struct walk_control *wc)
1233 struct btrfs_key key;
1238 struct cache_tree *inode_cache;
1239 struct shared_node *active_node;
1241 if (wc->root_level == wc->active_node &&
1242 btrfs_root_refs(&root->root_item) == 0)
1245 active_node = wc->nodes[wc->active_node];
1246 inode_cache = &active_node->inode_cache;
1247 nritems = btrfs_header_nritems(eb);
1248 for (i = 0; i < nritems; i++) {
1249 btrfs_item_key_to_cpu(eb, &key, i);
1251 if (key.objectid == BTRFS_FREE_SPACE_OBJECTID)
1253 if (key.type == BTRFS_ORPHAN_ITEM_KEY)
1256 if (active_node->current == NULL ||
1257 active_node->current->ino < key.objectid) {
1258 if (active_node->current) {
1259 active_node->current->checked = 1;
1260 maybe_free_inode_rec(inode_cache,
1261 active_node->current);
1263 active_node->current = get_inode_rec(inode_cache,
1267 case BTRFS_DIR_ITEM_KEY:
1268 case BTRFS_DIR_INDEX_KEY:
1269 ret = process_dir_item(root, eb, i, &key, active_node);
1271 case BTRFS_INODE_REF_KEY:
1272 ret = process_inode_ref(eb, i, &key, active_node);
1274 case BTRFS_INODE_EXTREF_KEY:
1275 ret = process_inode_extref(eb, i, &key, active_node);
1277 case BTRFS_INODE_ITEM_KEY:
1278 ret = process_inode_item(eb, i, &key, active_node);
1280 case BTRFS_EXTENT_DATA_KEY:
1281 ret = process_file_extent(root, eb, i, &key,
1293 static void reada_walk_down(struct btrfs_root *root,
1294 struct extent_buffer *node, int slot)
1303 level = btrfs_header_level(node);
1307 nritems = btrfs_header_nritems(node);
1308 blocksize = btrfs_level_size(root, level - 1);
1309 for (i = slot; i < nritems; i++) {
1310 bytenr = btrfs_node_blockptr(node, i);
1311 ptr_gen = btrfs_node_ptr_generation(node, i);
1312 readahead_tree_block(root, bytenr, blocksize, ptr_gen);
1316 static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path,
1317 struct walk_control *wc, int *level)
1321 struct extent_buffer *next;
1322 struct extent_buffer *cur;
1327 WARN_ON(*level < 0);
1328 WARN_ON(*level >= BTRFS_MAX_LEVEL);
1329 ret = btrfs_lookup_extent_info(NULL, root,
1330 path->nodes[*level]->start,
1331 *level, 1, &refs, NULL);
1338 ret = enter_shared_node(root, path->nodes[*level]->start,
1346 while (*level >= 0) {
1347 WARN_ON(*level < 0);
1348 WARN_ON(*level >= BTRFS_MAX_LEVEL);
1349 cur = path->nodes[*level];
1351 if (btrfs_header_level(cur) != *level)
1354 if (path->slots[*level] >= btrfs_header_nritems(cur))
1357 ret = process_one_leaf(root, cur, wc);
1360 bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
1361 ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
1362 blocksize = btrfs_level_size(root, *level - 1);
1363 ret = btrfs_lookup_extent_info(NULL, root, bytenr, *level - 1,
1369 ret = enter_shared_node(root, bytenr, refs,
1372 path->slots[*level]++;
1377 next = btrfs_find_tree_block(root, bytenr, blocksize);
1378 if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
1379 free_extent_buffer(next);
1380 reada_walk_down(root, cur, path->slots[*level]);
1381 next = read_tree_block(root, bytenr, blocksize,
1389 *level = *level - 1;
1390 free_extent_buffer(path->nodes[*level]);
1391 path->nodes[*level] = next;
1392 path->slots[*level] = 0;
1395 path->slots[*level] = btrfs_header_nritems(path->nodes[*level]);
1399 static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path,
1400 struct walk_control *wc, int *level)
1403 struct extent_buffer *leaf;
1405 for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
1406 leaf = path->nodes[i];
1407 if (path->slots[i] + 1 < btrfs_header_nritems(leaf)) {
1412 free_extent_buffer(path->nodes[*level]);
1413 path->nodes[*level] = NULL;
1414 BUG_ON(*level > wc->active_node);
1415 if (*level == wc->active_node)
1416 leave_shared_node(root, wc, *level);
1423 static int check_root_dir(struct inode_record *rec)
1425 struct inode_backref *backref;
1428 if (!rec->found_inode_item || rec->errors)
1430 if (rec->nlink != 1 || rec->found_link != 0)
1432 if (list_empty(&rec->backrefs))
1434 backref = list_entry(rec->backrefs.next, struct inode_backref, list);
1435 if (!backref->found_inode_ref)
1437 if (backref->index != 0 || backref->namelen != 2 ||
1438 memcmp(backref->name, "..", 2))
1440 if (backref->found_dir_index || backref->found_dir_item)
1447 static int repair_inode_isize(struct btrfs_trans_handle *trans,
1448 struct btrfs_root *root, struct btrfs_path *path,
1449 struct inode_record *rec)
1451 struct btrfs_inode_item *ei;
1452 struct btrfs_key key;
1455 key.objectid = rec->ino;
1456 key.type = BTRFS_INODE_ITEM_KEY;
1457 key.offset = (u64)-1;
1459 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
1463 if (!path->slots[0]) {
1470 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1471 if (key.objectid != rec->ino) {
1476 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
1477 struct btrfs_inode_item);
1478 btrfs_set_inode_size(path->nodes[0], ei, rec->found_size);
1479 btrfs_mark_buffer_dirty(path->nodes[0]);
1480 rec->errors &= ~I_ERR_DIR_ISIZE_WRONG;
1481 printf("reset isize for dir %Lu root %Lu\n", rec->ino,
1482 root->root_key.objectid);
1484 btrfs_release_path(path);
1488 static int repair_inode_orphan_item(struct btrfs_trans_handle *trans,
1489 struct btrfs_root *root,
1490 struct btrfs_path *path,
1491 struct inode_record *rec)
1493 struct btrfs_key key;
1496 key.objectid = BTRFS_ORPHAN_OBJECTID;
1497 key.type = BTRFS_ORPHAN_ITEM_KEY;
1498 key.offset = rec->ino;
1500 ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
1501 btrfs_release_path(path);
1503 rec->errors &= ~I_ERR_NO_ORPHAN_ITEM;
1507 static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
1509 struct btrfs_trans_handle *trans;
1510 struct btrfs_path *path;
1513 /* So far we just fix dir isize wrong */
1514 if (!(rec->errors & (I_ERR_DIR_ISIZE_WRONG | I_ERR_NO_ORPHAN_ITEM)))
1517 path = btrfs_alloc_path();
1521 trans = btrfs_start_transaction(root, 1);
1522 if (IS_ERR(trans)) {
1523 btrfs_free_path(path);
1524 return PTR_ERR(trans);
1527 if (rec->errors & I_ERR_DIR_ISIZE_WRONG)
1528 ret = repair_inode_isize(trans, root, path, rec);
1529 if (!ret && rec->errors & I_ERR_NO_ORPHAN_ITEM)
1530 ret = repair_inode_orphan_item(trans, root, path, rec);
1531 btrfs_commit_transaction(trans, root);
1532 btrfs_free_path(path);
1536 static int check_inode_recs(struct btrfs_root *root,
1537 struct cache_tree *inode_cache)
1539 struct cache_extent *cache;
1540 struct ptr_node *node;
1541 struct inode_record *rec;
1542 struct inode_backref *backref;
1545 u64 root_dirid = btrfs_root_dirid(&root->root_item);
1547 if (btrfs_root_refs(&root->root_item) == 0) {
1548 if (!cache_tree_empty(inode_cache))
1549 fprintf(stderr, "warning line %d\n", __LINE__);
1553 rec = get_inode_rec(inode_cache, root_dirid, 0);
1555 ret = check_root_dir(rec);
1557 fprintf(stderr, "root %llu root dir %llu error\n",
1558 (unsigned long long)root->root_key.objectid,
1559 (unsigned long long)root_dirid);
1563 fprintf(stderr, "root %llu root dir %llu not found\n",
1564 (unsigned long long)root->root_key.objectid,
1565 (unsigned long long)root_dirid);
1569 cache = search_cache_extent(inode_cache, 0);
1572 node = container_of(cache, struct ptr_node, cache);
1574 remove_cache_extent(inode_cache, &node->cache);
1576 if (rec->ino == root_dirid ||
1577 rec->ino == BTRFS_ORPHAN_OBJECTID) {
1578 free_inode_rec(rec);
1582 if (rec->errors & I_ERR_NO_ORPHAN_ITEM) {
1583 ret = check_orphan_item(root, rec->ino);
1585 rec->errors &= ~I_ERR_NO_ORPHAN_ITEM;
1586 if (can_free_inode_rec(rec)) {
1587 free_inode_rec(rec);
1593 ret = try_repair_inode(root, rec);
1594 if (ret == 0 && can_free_inode_rec(rec)) {
1595 free_inode_rec(rec);
1602 if (!rec->found_inode_item)
1603 rec->errors |= I_ERR_NO_INODE_ITEM;
1604 if (rec->found_link != rec->nlink)
1605 rec->errors |= I_ERR_LINK_COUNT_WRONG;
1606 fprintf(stderr, "root %llu inode %llu errors %x",
1607 (unsigned long long) root->root_key.objectid,
1608 (unsigned long long) rec->ino, rec->errors);
1609 print_inode_error(rec->errors);
1610 list_for_each_entry(backref, &rec->backrefs, list) {
1611 if (!backref->found_dir_item)
1612 backref->errors |= REF_ERR_NO_DIR_ITEM;
1613 if (!backref->found_dir_index)
1614 backref->errors |= REF_ERR_NO_DIR_INDEX;
1615 if (!backref->found_inode_ref)
1616 backref->errors |= REF_ERR_NO_INODE_REF;
1617 fprintf(stderr, "\tunresolved ref dir %llu index %llu"
1618 " namelen %u name %s filetype %d errors %x",
1619 (unsigned long long)backref->dir,
1620 (unsigned long long)backref->index,
1621 backref->namelen, backref->name,
1622 backref->filetype, backref->errors);
1623 print_ref_error(backref->errors);
1625 free_inode_rec(rec);
1627 return (error > 0) ? -1 : 0;
1630 static struct root_record *get_root_rec(struct cache_tree *root_cache,
1633 struct cache_extent *cache;
1634 struct root_record *rec = NULL;
1637 cache = lookup_cache_extent(root_cache, objectid, 1);
1639 rec = container_of(cache, struct root_record, cache);
1641 rec = calloc(1, sizeof(*rec));
1642 rec->objectid = objectid;
1643 INIT_LIST_HEAD(&rec->backrefs);
1644 rec->cache.start = objectid;
1645 rec->cache.size = 1;
1647 ret = insert_cache_extent(root_cache, &rec->cache);
1653 static struct root_backref *get_root_backref(struct root_record *rec,
1654 u64 ref_root, u64 dir, u64 index,
1655 const char *name, int namelen)
1657 struct root_backref *backref;
1659 list_for_each_entry(backref, &rec->backrefs, list) {
1660 if (backref->ref_root != ref_root || backref->dir != dir ||
1661 backref->namelen != namelen)
1663 if (memcmp(name, backref->name, namelen))
1668 backref = malloc(sizeof(*backref) + namelen + 1);
1669 memset(backref, 0, sizeof(*backref));
1670 backref->ref_root = ref_root;
1672 backref->index = index;
1673 backref->namelen = namelen;
1674 memcpy(backref->name, name, namelen);
1675 backref->name[namelen] = '\0';
1676 list_add_tail(&backref->list, &rec->backrefs);
1680 static void free_root_record(struct cache_extent *cache)
1682 struct root_record *rec;
1683 struct root_backref *backref;
1685 rec = container_of(cache, struct root_record, cache);
1686 while (!list_empty(&rec->backrefs)) {
1687 backref = list_entry(rec->backrefs.next,
1688 struct root_backref, list);
1689 list_del(&backref->list);
1696 FREE_EXTENT_CACHE_BASED_TREE(root_recs, free_root_record);
1698 static int add_root_backref(struct cache_tree *root_cache,
1699 u64 root_id, u64 ref_root, u64 dir, u64 index,
1700 const char *name, int namelen,
1701 int item_type, int errors)
1703 struct root_record *rec;
1704 struct root_backref *backref;
1706 rec = get_root_rec(root_cache, root_id);
1707 backref = get_root_backref(rec, ref_root, dir, index, name, namelen);
1709 backref->errors |= errors;
1711 if (item_type != BTRFS_DIR_ITEM_KEY) {
1712 if (backref->found_dir_index || backref->found_back_ref ||
1713 backref->found_forward_ref) {
1714 if (backref->index != index)
1715 backref->errors |= REF_ERR_INDEX_UNMATCH;
1717 backref->index = index;
1721 if (item_type == BTRFS_DIR_ITEM_KEY) {
1722 if (backref->found_forward_ref)
1724 backref->found_dir_item = 1;
1725 } else if (item_type == BTRFS_DIR_INDEX_KEY) {
1726 backref->found_dir_index = 1;
1727 } else if (item_type == BTRFS_ROOT_REF_KEY) {
1728 if (backref->found_forward_ref)
1729 backref->errors |= REF_ERR_DUP_ROOT_REF;
1730 else if (backref->found_dir_item)
1732 backref->found_forward_ref = 1;
1733 } else if (item_type == BTRFS_ROOT_BACKREF_KEY) {
1734 if (backref->found_back_ref)
1735 backref->errors |= REF_ERR_DUP_ROOT_BACKREF;
1736 backref->found_back_ref = 1;
1741 if (backref->found_forward_ref && backref->found_dir_item)
1742 backref->reachable = 1;
1746 static int merge_root_recs(struct btrfs_root *root,
1747 struct cache_tree *src_cache,
1748 struct cache_tree *dst_cache)
1750 struct cache_extent *cache;
1751 struct ptr_node *node;
1752 struct inode_record *rec;
1753 struct inode_backref *backref;
1755 if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
1756 free_inode_recs_tree(src_cache);
1761 cache = search_cache_extent(src_cache, 0);
1764 node = container_of(cache, struct ptr_node, cache);
1766 remove_cache_extent(src_cache, &node->cache);
1769 if (!is_child_root(root, root->objectid, rec->ino))
1772 list_for_each_entry(backref, &rec->backrefs, list) {
1773 BUG_ON(backref->found_inode_ref);
1774 if (backref->found_dir_item)
1775 add_root_backref(dst_cache, rec->ino,
1776 root->root_key.objectid, backref->dir,
1777 backref->index, backref->name,
1778 backref->namelen, BTRFS_DIR_ITEM_KEY,
1780 if (backref->found_dir_index)
1781 add_root_backref(dst_cache, rec->ino,
1782 root->root_key.objectid, backref->dir,
1783 backref->index, backref->name,
1784 backref->namelen, BTRFS_DIR_INDEX_KEY,
1788 free_inode_rec(rec);
1793 static int check_root_refs(struct btrfs_root *root,
1794 struct cache_tree *root_cache)
1796 struct root_record *rec;
1797 struct root_record *ref_root;
1798 struct root_backref *backref;
1799 struct cache_extent *cache;
1805 rec = get_root_rec(root_cache, BTRFS_FS_TREE_OBJECTID);
1808 /* fixme: this can not detect circular references */
1811 cache = search_cache_extent(root_cache, 0);
1815 rec = container_of(cache, struct root_record, cache);
1816 cache = next_cache_extent(cache);
1818 if (rec->found_ref == 0)
1821 list_for_each_entry(backref, &rec->backrefs, list) {
1822 if (!backref->reachable)
1825 ref_root = get_root_rec(root_cache,
1827 if (ref_root->found_ref > 0)
1830 backref->reachable = 0;
1832 if (rec->found_ref == 0)
1838 cache = search_cache_extent(root_cache, 0);
1842 rec = container_of(cache, struct root_record, cache);
1843 cache = next_cache_extent(cache);
1845 if (rec->found_ref == 0 &&
1846 rec->objectid >= BTRFS_FIRST_FREE_OBJECTID &&
1847 rec->objectid <= BTRFS_LAST_FREE_OBJECTID) {
1848 ret = check_orphan_item(root->fs_info->tree_root,
1854 * If we don't have a root item then we likely just have
1855 * a dir item in a snapshot for this root but no actual
1856 * ref key or anything so it's meaningless.
1858 if (!rec->found_root_item)
1861 fprintf(stderr, "fs tree %llu not referenced\n",
1862 (unsigned long long)rec->objectid);
1866 if (rec->found_ref > 0 && !rec->found_root_item)
1868 list_for_each_entry(backref, &rec->backrefs, list) {
1869 if (!backref->found_dir_item)
1870 backref->errors |= REF_ERR_NO_DIR_ITEM;
1871 if (!backref->found_dir_index)
1872 backref->errors |= REF_ERR_NO_DIR_INDEX;
1873 if (!backref->found_back_ref)
1874 backref->errors |= REF_ERR_NO_ROOT_BACKREF;
1875 if (!backref->found_forward_ref)
1876 backref->errors |= REF_ERR_NO_ROOT_REF;
1877 if (backref->reachable && backref->errors)
1884 fprintf(stderr, "fs tree %llu refs %u %s\n",
1885 (unsigned long long)rec->objectid, rec->found_ref,
1886 rec->found_root_item ? "" : "not found");
1888 list_for_each_entry(backref, &rec->backrefs, list) {
1889 if (!backref->reachable)
1891 if (!backref->errors && rec->found_root_item)
1893 fprintf(stderr, "\tunresolved ref root %llu dir %llu"
1894 " index %llu namelen %u name %s errors %x\n",
1895 (unsigned long long)backref->ref_root,
1896 (unsigned long long)backref->dir,
1897 (unsigned long long)backref->index,
1898 backref->namelen, backref->name,
1900 print_ref_error(backref->errors);
1903 return errors > 0 ? 1 : 0;
1906 static int process_root_ref(struct extent_buffer *eb, int slot,
1907 struct btrfs_key *key,
1908 struct cache_tree *root_cache)
1914 struct btrfs_root_ref *ref;
1915 char namebuf[BTRFS_NAME_LEN];
1918 ref = btrfs_item_ptr(eb, slot, struct btrfs_root_ref);
1920 dirid = btrfs_root_ref_dirid(eb, ref);
1921 index = btrfs_root_ref_sequence(eb, ref);
1922 name_len = btrfs_root_ref_name_len(eb, ref);
1924 if (name_len <= BTRFS_NAME_LEN) {
1928 len = BTRFS_NAME_LEN;
1929 error = REF_ERR_NAME_TOO_LONG;
1931 read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len);
1933 if (key->type == BTRFS_ROOT_REF_KEY) {
1934 add_root_backref(root_cache, key->offset, key->objectid, dirid,
1935 index, namebuf, len, key->type, error);
1937 add_root_backref(root_cache, key->objectid, key->offset, dirid,
1938 index, namebuf, len, key->type, error);
1943 static int check_fs_root(struct btrfs_root *root,
1944 struct cache_tree *root_cache,
1945 struct walk_control *wc)
1950 struct btrfs_path path;
1951 struct shared_node root_node;
1952 struct root_record *rec;
1953 struct btrfs_root_item *root_item = &root->root_item;
1955 if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
1956 rec = get_root_rec(root_cache, root->root_key.objectid);
1957 if (btrfs_root_refs(root_item) > 0)
1958 rec->found_root_item = 1;
1961 btrfs_init_path(&path);
1962 memset(&root_node, 0, sizeof(root_node));
1963 cache_tree_init(&root_node.root_cache);
1964 cache_tree_init(&root_node.inode_cache);
1966 level = btrfs_header_level(root->node);
1967 memset(wc->nodes, 0, sizeof(wc->nodes));
1968 wc->nodes[level] = &root_node;
1969 wc->active_node = level;
1970 wc->root_level = level;
1972 if (btrfs_root_refs(root_item) > 0 ||
1973 btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
1974 path.nodes[level] = root->node;
1975 extent_buffer_get(root->node);
1976 path.slots[level] = 0;
1978 struct btrfs_key key;
1979 struct btrfs_disk_key found_key;
1981 btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
1982 level = root_item->drop_level;
1983 path.lowest_level = level;
1984 wret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1986 btrfs_node_key(path.nodes[level], &found_key,
1988 WARN_ON(memcmp(&found_key, &root_item->drop_progress,
1989 sizeof(found_key)));
1993 wret = walk_down_tree(root, &path, wc, &level);
1999 wret = walk_up_tree(root, &path, wc, &level);
2005 btrfs_release_path(&path);
2007 merge_root_recs(root, &root_node.root_cache, root_cache);
2009 if (root_node.current) {
2010 root_node.current->checked = 1;
2011 maybe_free_inode_rec(&root_node.inode_cache,
2015 ret = check_inode_recs(root, &root_node.inode_cache);
2019 static int fs_root_objectid(u64 objectid)
2021 if (objectid == BTRFS_TREE_RELOC_OBJECTID ||
2022 objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
2024 return is_fstree(objectid);
2027 static int check_fs_roots(struct btrfs_root *root,
2028 struct cache_tree *root_cache)
2030 struct btrfs_path path;
2031 struct btrfs_key key;
2032 struct walk_control wc;
2033 struct extent_buffer *leaf;
2034 struct btrfs_root *tmp_root;
2035 struct btrfs_root *tree_root = root->fs_info->tree_root;
2040 * Just in case we made any changes to the extent tree that weren't
2041 * reflected into the free space cache yet.
2044 reset_cached_block_groups(root->fs_info);
2045 memset(&wc, 0, sizeof(wc));
2046 cache_tree_init(&wc.shared);
2047 btrfs_init_path(&path);
2051 key.type = BTRFS_ROOT_ITEM_KEY;
2052 ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0);
2055 leaf = path.nodes[0];
2056 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2057 ret = btrfs_next_leaf(tree_root, &path);
2060 leaf = path.nodes[0];
2062 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2063 if (key.type == BTRFS_ROOT_ITEM_KEY &&
2064 fs_root_objectid(key.objectid)) {
2065 key.offset = (u64)-1;
2066 tmp_root = btrfs_read_fs_root(root->fs_info, &key);
2067 if (IS_ERR(tmp_root)) {
2071 ret = check_fs_root(tmp_root, root_cache, &wc);
2074 } else if (key.type == BTRFS_ROOT_REF_KEY ||
2075 key.type == BTRFS_ROOT_BACKREF_KEY) {
2076 process_root_ref(leaf, path.slots[0], &key,
2082 btrfs_release_path(&path);
2084 if (!cache_tree_empty(&wc.shared))
2085 fprintf(stderr, "warning line %d\n", __LINE__);
2090 static int all_backpointers_checked(struct extent_record *rec, int print_errs)
2092 struct list_head *cur = rec->backrefs.next;
2093 struct extent_backref *back;
2094 struct tree_backref *tback;
2095 struct data_backref *dback;
2099 while(cur != &rec->backrefs) {
2100 back = list_entry(cur, struct extent_backref, list);
2102 if (!back->found_extent_tree) {
2106 if (back->is_data) {
2107 dback = (struct data_backref *)back;
2108 fprintf(stderr, "Backref %llu %s %llu"
2109 " owner %llu offset %llu num_refs %lu"
2110 " not found in extent tree\n",
2111 (unsigned long long)rec->start,
2112 back->full_backref ?
2114 back->full_backref ?
2115 (unsigned long long)dback->parent:
2116 (unsigned long long)dback->root,
2117 (unsigned long long)dback->owner,
2118 (unsigned long long)dback->offset,
2119 (unsigned long)dback->num_refs);
2121 tback = (struct tree_backref *)back;
2122 fprintf(stderr, "Backref %llu parent %llu"
2123 " root %llu not found in extent tree\n",
2124 (unsigned long long)rec->start,
2125 (unsigned long long)tback->parent,
2126 (unsigned long long)tback->root);
2129 if (!back->is_data && !back->found_ref) {
2133 tback = (struct tree_backref *)back;
2134 fprintf(stderr, "Backref %llu %s %llu not referenced back %p\n",
2135 (unsigned long long)rec->start,
2136 back->full_backref ? "parent" : "root",
2137 back->full_backref ?
2138 (unsigned long long)tback->parent :
2139 (unsigned long long)tback->root, back);
2141 if (back->is_data) {
2142 dback = (struct data_backref *)back;
2143 if (dback->found_ref != dback->num_refs) {
2147 fprintf(stderr, "Incorrect local backref count"
2148 " on %llu %s %llu owner %llu"
2149 " offset %llu found %u wanted %u back %p\n",
2150 (unsigned long long)rec->start,
2151 back->full_backref ?
2153 back->full_backref ?
2154 (unsigned long long)dback->parent:
2155 (unsigned long long)dback->root,
2156 (unsigned long long)dback->owner,
2157 (unsigned long long)dback->offset,
2158 dback->found_ref, dback->num_refs, back);
2160 if (dback->disk_bytenr != rec->start) {
2164 fprintf(stderr, "Backref disk bytenr does not"
2165 " match extent record, bytenr=%llu, "
2166 "ref bytenr=%llu\n",
2167 (unsigned long long)rec->start,
2168 (unsigned long long)dback->disk_bytenr);
2171 if (dback->bytes != rec->nr) {
2175 fprintf(stderr, "Backref bytes do not match "
2176 "extent backref, bytenr=%llu, ref "
2177 "bytes=%llu, backref bytes=%llu\n",
2178 (unsigned long long)rec->start,
2179 (unsigned long long)rec->nr,
2180 (unsigned long long)dback->bytes);
2183 if (!back->is_data) {
2186 dback = (struct data_backref *)back;
2187 found += dback->found_ref;
2190 if (found != rec->refs) {
2194 fprintf(stderr, "Incorrect global backref count "
2195 "on %llu found %llu wanted %llu\n",
2196 (unsigned long long)rec->start,
2197 (unsigned long long)found,
2198 (unsigned long long)rec->refs);
2204 static int free_all_extent_backrefs(struct extent_record *rec)
2206 struct extent_backref *back;
2207 struct list_head *cur;
2208 while (!list_empty(&rec->backrefs)) {
2209 cur = rec->backrefs.next;
2210 back = list_entry(cur, struct extent_backref, list);
2217 static void free_extent_record_cache(struct btrfs_fs_info *fs_info,
2218 struct cache_tree *extent_cache)
2220 struct cache_extent *cache;
2221 struct extent_record *rec;
2224 cache = first_cache_extent(extent_cache);
2227 rec = container_of(cache, struct extent_record, cache);
2228 btrfs_unpin_extent(fs_info, rec->start, rec->max_size);
2229 remove_cache_extent(extent_cache, cache);
2230 free_all_extent_backrefs(rec);
2235 static int maybe_free_extent_rec(struct cache_tree *extent_cache,
2236 struct extent_record *rec)
2238 if (rec->content_checked && rec->owner_ref_checked &&
2239 rec->extent_item_refs == rec->refs && rec->refs > 0 &&
2240 rec->num_duplicates == 0 && !all_backpointers_checked(rec, 0)) {
2241 remove_cache_extent(extent_cache, &rec->cache);
2242 free_all_extent_backrefs(rec);
2243 list_del_init(&rec->list);
2249 static int check_owner_ref(struct btrfs_root *root,
2250 struct extent_record *rec,
2251 struct extent_buffer *buf)
2253 struct extent_backref *node;
2254 struct tree_backref *back;
2255 struct btrfs_root *ref_root;
2256 struct btrfs_key key;
2257 struct btrfs_path path;
2258 struct extent_buffer *parent;
2263 list_for_each_entry(node, &rec->backrefs, list) {
2266 if (!node->found_ref)
2268 if (node->full_backref)
2270 back = (struct tree_backref *)node;
2271 if (btrfs_header_owner(buf) == back->root)
2274 BUG_ON(rec->is_root);
2276 /* try to find the block by search corresponding fs tree */
2277 key.objectid = btrfs_header_owner(buf);
2278 key.type = BTRFS_ROOT_ITEM_KEY;
2279 key.offset = (u64)-1;
2281 ref_root = btrfs_read_fs_root(root->fs_info, &key);
2282 if (IS_ERR(ref_root))
2285 level = btrfs_header_level(buf);
2287 btrfs_item_key_to_cpu(buf, &key, 0);
2289 btrfs_node_key_to_cpu(buf, &key, 0);
2291 btrfs_init_path(&path);
2292 path.lowest_level = level + 1;
2293 ret = btrfs_search_slot(NULL, ref_root, &key, &path, 0, 0);
2297 parent = path.nodes[level + 1];
2298 if (parent && buf->start == btrfs_node_blockptr(parent,
2299 path.slots[level + 1]))
2302 btrfs_release_path(&path);
2303 return found ? 0 : 1;
2306 static int is_extent_tree_record(struct extent_record *rec)
2308 struct list_head *cur = rec->backrefs.next;
2309 struct extent_backref *node;
2310 struct tree_backref *back;
2313 while(cur != &rec->backrefs) {
2314 node = list_entry(cur, struct extent_backref, list);
2318 back = (struct tree_backref *)node;
2319 if (node->full_backref)
2321 if (back->root == BTRFS_EXTENT_TREE_OBJECTID)
2328 static int record_bad_block_io(struct btrfs_fs_info *info,
2329 struct cache_tree *extent_cache,
2332 struct extent_record *rec;
2333 struct cache_extent *cache;
2334 struct btrfs_key key;
2336 cache = lookup_cache_extent(extent_cache, start, len);
2340 rec = container_of(cache, struct extent_record, cache);
2341 if (!is_extent_tree_record(rec))
2344 btrfs_disk_key_to_cpu(&key, &rec->parent_key);
2345 return btrfs_add_corrupt_extent_record(info, &key, start, len, 0);
2348 static int swap_values(struct btrfs_root *root, struct btrfs_path *path,
2349 struct extent_buffer *buf, int slot)
2351 if (btrfs_header_level(buf)) {
2352 struct btrfs_key_ptr ptr1, ptr2;
2354 read_extent_buffer(buf, &ptr1, btrfs_node_key_ptr_offset(slot),
2355 sizeof(struct btrfs_key_ptr));
2356 read_extent_buffer(buf, &ptr2,
2357 btrfs_node_key_ptr_offset(slot + 1),
2358 sizeof(struct btrfs_key_ptr));
2359 write_extent_buffer(buf, &ptr1,
2360 btrfs_node_key_ptr_offset(slot + 1),
2361 sizeof(struct btrfs_key_ptr));
2362 write_extent_buffer(buf, &ptr2,
2363 btrfs_node_key_ptr_offset(slot),
2364 sizeof(struct btrfs_key_ptr));
2366 struct btrfs_disk_key key;
2367 btrfs_node_key(buf, &key, 0);
2368 btrfs_fixup_low_keys(root, path, &key,
2369 btrfs_header_level(buf) + 1);
2372 struct btrfs_item *item1, *item2;
2373 struct btrfs_key k1, k2;
2374 char *item1_data, *item2_data;
2375 u32 item1_offset, item2_offset, item1_size, item2_size;
2377 item1 = btrfs_item_nr(slot);
2378 item2 = btrfs_item_nr(slot + 1);
2379 btrfs_item_key_to_cpu(buf, &k1, slot);
2380 btrfs_item_key_to_cpu(buf, &k2, slot + 1);
2381 item1_offset = btrfs_item_offset(buf, item1);
2382 item2_offset = btrfs_item_offset(buf, item2);
2383 item1_size = btrfs_item_size(buf, item1);
2384 item2_size = btrfs_item_size(buf, item2);
2386 item1_data = malloc(item1_size);
2389 item2_data = malloc(item2_size);
2395 read_extent_buffer(buf, item1_data, item1_offset, item1_size);
2396 read_extent_buffer(buf, item2_data, item2_offset, item2_size);
2398 write_extent_buffer(buf, item1_data, item2_offset, item2_size);
2399 write_extent_buffer(buf, item2_data, item1_offset, item1_size);
2403 btrfs_set_item_offset(buf, item1, item2_offset);
2404 btrfs_set_item_offset(buf, item2, item1_offset);
2405 btrfs_set_item_size(buf, item1, item2_size);
2406 btrfs_set_item_size(buf, item2, item1_size);
2408 path->slots[0] = slot;
2409 btrfs_set_item_key_unsafe(root, path, &k2);
2410 path->slots[0] = slot + 1;
2411 btrfs_set_item_key_unsafe(root, path, &k1);
2417 * Attempt to fix basic block failures. Currently we only handle bad key
2418 * orders, we will cycle through the keys and swap them if necessary.
2420 static int try_to_fix_bad_block(struct btrfs_trans_handle *trans,
2421 struct btrfs_root *root,
2422 struct extent_buffer *buf,
2423 struct btrfs_disk_key *parent_key,
2424 enum btrfs_tree_block_status status)
2426 struct btrfs_path *path;
2427 struct btrfs_key k1, k2;
2432 if (status != BTRFS_TREE_BLOCK_BAD_KEY_ORDER)
2435 k1.objectid = btrfs_header_owner(buf);
2436 k1.type = BTRFS_ROOT_ITEM_KEY;
2437 k1.offset = (u64)-1;
2439 root = btrfs_read_fs_root(root->fs_info, &k1);
2443 record_root_in_trans(trans, root);
2445 path = btrfs_alloc_path();
2449 level = btrfs_header_level(buf);
2450 path->lowest_level = level;
2451 path->skip_check_block = 1;
2453 btrfs_node_key_to_cpu(buf, &k1, 0);
2455 btrfs_item_key_to_cpu(buf, &k1, 0);
2457 ret = btrfs_search_slot(trans, root, &k1, path, 0, 1);
2459 btrfs_free_path(path);
2463 buf = path->nodes[level];
2464 for (i = 0; i < btrfs_header_nritems(buf) - 1; i++) {
2466 btrfs_node_key_to_cpu(buf, &k1, i);
2467 btrfs_node_key_to_cpu(buf, &k2, i + 1);
2469 btrfs_item_key_to_cpu(buf, &k1, i);
2470 btrfs_item_key_to_cpu(buf, &k2, i + 1);
2472 if (btrfs_comp_cpu_keys(&k1, &k2) < 0)
2474 ret = swap_values(root, path, buf, i);
2477 btrfs_mark_buffer_dirty(buf);
2481 btrfs_free_path(path);
2485 static int check_block(struct btrfs_trans_handle *trans,
2486 struct btrfs_root *root,
2487 struct cache_tree *extent_cache,
2488 struct extent_buffer *buf, u64 flags)
2490 struct extent_record *rec;
2491 struct cache_extent *cache;
2492 struct btrfs_key key;
2493 enum btrfs_tree_block_status status;
2497 cache = lookup_cache_extent(extent_cache, buf->start, buf->len);
2500 rec = container_of(cache, struct extent_record, cache);
2501 rec->generation = btrfs_header_generation(buf);
2503 level = btrfs_header_level(buf);
2504 if (btrfs_header_nritems(buf) > 0) {
2507 btrfs_item_key_to_cpu(buf, &key, 0);
2509 btrfs_node_key_to_cpu(buf, &key, 0);
2511 rec->info_objectid = key.objectid;
2513 rec->info_level = level;
2515 if (btrfs_is_leaf(buf))
2516 status = btrfs_check_leaf(root, &rec->parent_key, buf);
2518 status = btrfs_check_node(root, &rec->parent_key, buf);
2520 if (status != BTRFS_TREE_BLOCK_CLEAN) {
2522 status = try_to_fix_bad_block(trans, root, buf,
2525 if (status != BTRFS_TREE_BLOCK_CLEAN) {
2527 fprintf(stderr, "bad block %llu\n",
2528 (unsigned long long)buf->start);
2531 * Signal to callers we need to start the scan over
2532 * again since we'll have cow'ed blocks.
2537 rec->content_checked = 1;
2538 if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)
2539 rec->owner_ref_checked = 1;
2541 ret = check_owner_ref(root, rec, buf);
2543 rec->owner_ref_checked = 1;
2547 maybe_free_extent_rec(extent_cache, rec);
2551 static struct tree_backref *find_tree_backref(struct extent_record *rec,
2552 u64 parent, u64 root)
2554 struct list_head *cur = rec->backrefs.next;
2555 struct extent_backref *node;
2556 struct tree_backref *back;
2558 while(cur != &rec->backrefs) {
2559 node = list_entry(cur, struct extent_backref, list);
2563 back = (struct tree_backref *)node;
2565 if (!node->full_backref)
2567 if (parent == back->parent)
2570 if (node->full_backref)
2572 if (back->root == root)
2579 static struct tree_backref *alloc_tree_backref(struct extent_record *rec,
2580 u64 parent, u64 root)
2582 struct tree_backref *ref = malloc(sizeof(*ref));
2583 memset(&ref->node, 0, sizeof(ref->node));
2585 ref->parent = parent;
2586 ref->node.full_backref = 1;
2589 ref->node.full_backref = 0;
2591 list_add_tail(&ref->node.list, &rec->backrefs);
2596 static struct data_backref *find_data_backref(struct extent_record *rec,
2597 u64 parent, u64 root,
2598 u64 owner, u64 offset,
2600 u64 disk_bytenr, u64 bytes)
2602 struct list_head *cur = rec->backrefs.next;
2603 struct extent_backref *node;
2604 struct data_backref *back;
2606 while(cur != &rec->backrefs) {
2607 node = list_entry(cur, struct extent_backref, list);
2611 back = (struct data_backref *)node;
2613 if (!node->full_backref)
2615 if (parent == back->parent)
2618 if (node->full_backref)
2620 if (back->root == root && back->owner == owner &&
2621 back->offset == offset) {
2622 if (found_ref && node->found_ref &&
2623 (back->bytes != bytes ||
2624 back->disk_bytenr != disk_bytenr))
2633 static struct data_backref *alloc_data_backref(struct extent_record *rec,
2634 u64 parent, u64 root,
2635 u64 owner, u64 offset,
2638 struct data_backref *ref = malloc(sizeof(*ref));
2639 memset(&ref->node, 0, sizeof(ref->node));
2640 ref->node.is_data = 1;
2643 ref->parent = parent;
2646 ref->node.full_backref = 1;
2650 ref->offset = offset;
2651 ref->node.full_backref = 0;
2653 ref->bytes = max_size;
2656 list_add_tail(&ref->node.list, &rec->backrefs);
2657 if (max_size > rec->max_size)
2658 rec->max_size = max_size;
2662 static int add_extent_rec(struct cache_tree *extent_cache,
2663 struct btrfs_key *parent_key, u64 parent_gen,
2664 u64 start, u64 nr, u64 extent_item_refs,
2665 int is_root, int inc_ref, int set_checked,
2666 int metadata, int extent_rec, u64 max_size)
2668 struct extent_record *rec;
2669 struct cache_extent *cache;
2673 cache = lookup_cache_extent(extent_cache, start, nr);
2675 rec = container_of(cache, struct extent_record, cache);
2679 rec->nr = max(nr, max_size);
2682 * We need to make sure to reset nr to whatever the extent
2683 * record says was the real size, this way we can compare it to
2687 if (start != rec->start || rec->found_rec) {
2688 struct extent_record *tmp;
2691 if (list_empty(&rec->list))
2692 list_add_tail(&rec->list,
2693 &duplicate_extents);
2696 * We have to do this song and dance in case we
2697 * find an extent record that falls inside of
2698 * our current extent record but does not have
2699 * the same objectid.
2701 tmp = malloc(sizeof(*tmp));
2705 tmp->max_size = max_size;
2708 tmp->metadata = metadata;
2709 tmp->extent_item_refs = extent_item_refs;
2710 INIT_LIST_HEAD(&tmp->list);
2711 list_add_tail(&tmp->list, &rec->dups);
2712 rec->num_duplicates++;
2719 if (extent_item_refs && !dup) {
2720 if (rec->extent_item_refs) {
2721 fprintf(stderr, "block %llu rec "
2722 "extent_item_refs %llu, passed %llu\n",
2723 (unsigned long long)start,
2724 (unsigned long long)
2725 rec->extent_item_refs,
2726 (unsigned long long)extent_item_refs);
2728 rec->extent_item_refs = extent_item_refs;
2733 rec->content_checked = 1;
2734 rec->owner_ref_checked = 1;
2738 btrfs_cpu_key_to_disk(&rec->parent_key, parent_key);
2740 rec->parent_generation = parent_gen;
2742 if (rec->max_size < max_size)
2743 rec->max_size = max_size;
2745 maybe_free_extent_rec(extent_cache, rec);
2748 rec = malloc(sizeof(*rec));
2750 rec->max_size = max_size;
2751 rec->nr = max(nr, max_size);
2752 rec->found_rec = !!extent_rec;
2753 rec->content_checked = 0;
2754 rec->owner_ref_checked = 0;
2755 rec->num_duplicates = 0;
2756 rec->metadata = metadata;
2757 INIT_LIST_HEAD(&rec->backrefs);
2758 INIT_LIST_HEAD(&rec->dups);
2759 INIT_LIST_HEAD(&rec->list);
2771 if (extent_item_refs)
2772 rec->extent_item_refs = extent_item_refs;
2774 rec->extent_item_refs = 0;
2777 btrfs_cpu_key_to_disk(&rec->parent_key, parent_key);
2779 memset(&rec->parent_key, 0, sizeof(*parent_key));
2782 rec->parent_generation = parent_gen;
2784 rec->parent_generation = 0;
2786 rec->cache.start = start;
2787 rec->cache.size = nr;
2788 ret = insert_cache_extent(extent_cache, &rec->cache);
2792 rec->content_checked = 1;
2793 rec->owner_ref_checked = 1;
2798 static int add_tree_backref(struct cache_tree *extent_cache, u64 bytenr,
2799 u64 parent, u64 root, int found_ref)
2801 struct extent_record *rec;
2802 struct tree_backref *back;
2803 struct cache_extent *cache;
2805 cache = lookup_cache_extent(extent_cache, bytenr, 1);
2807 add_extent_rec(extent_cache, NULL, 0, bytenr,
2808 1, 0, 0, 0, 0, 1, 0, 0);
2809 cache = lookup_cache_extent(extent_cache, bytenr, 1);
2814 rec = container_of(cache, struct extent_record, cache);
2815 if (rec->start != bytenr) {
2819 back = find_tree_backref(rec, parent, root);
2821 back = alloc_tree_backref(rec, parent, root);
2824 if (back->node.found_ref) {
2825 fprintf(stderr, "Extent back ref already exists "
2826 "for %llu parent %llu root %llu \n",
2827 (unsigned long long)bytenr,
2828 (unsigned long long)parent,
2829 (unsigned long long)root);
2831 back->node.found_ref = 1;
2833 if (back->node.found_extent_tree) {
2834 fprintf(stderr, "Extent back ref already exists "
2835 "for %llu parent %llu root %llu \n",
2836 (unsigned long long)bytenr,
2837 (unsigned long long)parent,
2838 (unsigned long long)root);
2840 back->node.found_extent_tree = 1;
2842 maybe_free_extent_rec(extent_cache, rec);
2846 static int add_data_backref(struct cache_tree *extent_cache, u64 bytenr,
2847 u64 parent, u64 root, u64 owner, u64 offset,
2848 u32 num_refs, int found_ref, u64 max_size)
2850 struct extent_record *rec;
2851 struct data_backref *back;
2852 struct cache_extent *cache;
2854 cache = lookup_cache_extent(extent_cache, bytenr, 1);
2856 add_extent_rec(extent_cache, NULL, 0, bytenr, 1, 0, 0, 0, 0,
2858 cache = lookup_cache_extent(extent_cache, bytenr, 1);
2863 rec = container_of(cache, struct extent_record, cache);
2864 if (rec->max_size < max_size)
2865 rec->max_size = max_size;
2868 * If found_ref is set then max_size is the real size and must match the
2869 * existing refs. So if we have already found a ref then we need to
2870 * make sure that this ref matches the existing one, otherwise we need
2871 * to add a new backref so we can notice that the backrefs don't match
2872 * and we need to figure out who is telling the truth. This is to
2873 * account for that awful fsync bug I introduced where we'd end up with
2874 * a btrfs_file_extent_item that would have its length include multiple
2875 * prealloc extents or point inside of a prealloc extent.
2877 back = find_data_backref(rec, parent, root, owner, offset, found_ref,
2880 back = alloc_data_backref(rec, parent, root, owner, offset,
2884 BUG_ON(num_refs != 1);
2885 if (back->node.found_ref)
2886 BUG_ON(back->bytes != max_size);
2887 back->node.found_ref = 1;
2888 back->found_ref += 1;
2889 back->bytes = max_size;
2890 back->disk_bytenr = bytenr;
2892 rec->content_checked = 1;
2893 rec->owner_ref_checked = 1;
2895 if (back->node.found_extent_tree) {
2896 fprintf(stderr, "Extent back ref already exists "
2897 "for %llu parent %llu root %llu "
2898 "owner %llu offset %llu num_refs %lu\n",
2899 (unsigned long long)bytenr,
2900 (unsigned long long)parent,
2901 (unsigned long long)root,
2902 (unsigned long long)owner,
2903 (unsigned long long)offset,
2904 (unsigned long)num_refs);
2906 back->num_refs = num_refs;
2907 back->node.found_extent_tree = 1;
2909 maybe_free_extent_rec(extent_cache, rec);
2913 static int add_pending(struct cache_tree *pending,
2914 struct cache_tree *seen, u64 bytenr, u32 size)
2917 ret = add_cache_extent(seen, bytenr, size);
2920 add_cache_extent(pending, bytenr, size);
2924 static int pick_next_pending(struct cache_tree *pending,
2925 struct cache_tree *reada,
2926 struct cache_tree *nodes,
2927 u64 last, struct block_info *bits, int bits_nr,
2930 unsigned long node_start = last;
2931 struct cache_extent *cache;
2934 cache = search_cache_extent(reada, 0);
2936 bits[0].start = cache->start;
2937 bits[0].size = cache->size;
2942 if (node_start > 32768)
2943 node_start -= 32768;
2945 cache = search_cache_extent(nodes, node_start);
2947 cache = search_cache_extent(nodes, 0);
2950 cache = search_cache_extent(pending, 0);
2955 bits[ret].start = cache->start;
2956 bits[ret].size = cache->size;
2957 cache = next_cache_extent(cache);
2959 } while (cache && ret < bits_nr);
2965 bits[ret].start = cache->start;
2966 bits[ret].size = cache->size;
2967 cache = next_cache_extent(cache);
2969 } while (cache && ret < bits_nr);
2971 if (bits_nr - ret > 8) {
2972 u64 lookup = bits[0].start + bits[0].size;
2973 struct cache_extent *next;
2974 next = search_cache_extent(pending, lookup);
2976 if (next->start - lookup > 32768)
2978 bits[ret].start = next->start;
2979 bits[ret].size = next->size;
2980 lookup = next->start + next->size;
2984 next = next_cache_extent(next);
2992 static void free_chunk_record(struct cache_extent *cache)
2994 struct chunk_record *rec;
2996 rec = container_of(cache, struct chunk_record, cache);
3000 void free_chunk_cache_tree(struct cache_tree *chunk_cache)
3002 cache_tree_free_extents(chunk_cache, free_chunk_record);
3005 static void free_device_record(struct rb_node *node)
3007 struct device_record *rec;
3009 rec = container_of(node, struct device_record, node);
3013 FREE_RB_BASED_TREE(device_cache, free_device_record);
3015 int insert_block_group_record(struct block_group_tree *tree,
3016 struct block_group_record *bg_rec)
3020 ret = insert_cache_extent(&tree->tree, &bg_rec->cache);
3024 list_add_tail(&bg_rec->list, &tree->block_groups);
3028 static void free_block_group_record(struct cache_extent *cache)
3030 struct block_group_record *rec;
3032 rec = container_of(cache, struct block_group_record, cache);
3036 void free_block_group_tree(struct block_group_tree *tree)
3038 cache_tree_free_extents(&tree->tree, free_block_group_record);
3041 int insert_device_extent_record(struct device_extent_tree *tree,
3042 struct device_extent_record *de_rec)
3047 * Device extent is a bit different from the other extents, because
3048 * the extents which belong to the different devices may have the
3049 * same start and size, so we need use the special extent cache
3050 * search/insert functions.
3052 ret = insert_cache_extent2(&tree->tree, &de_rec->cache);
3056 list_add_tail(&de_rec->chunk_list, &tree->no_chunk_orphans);
3057 list_add_tail(&de_rec->device_list, &tree->no_device_orphans);
3061 static void free_device_extent_record(struct cache_extent *cache)
3063 struct device_extent_record *rec;
3065 rec = container_of(cache, struct device_extent_record, cache);
3069 void free_device_extent_tree(struct device_extent_tree *tree)
3071 cache_tree_free_extents(&tree->tree, free_device_extent_record);
3074 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
3075 static int process_extent_ref_v0(struct cache_tree *extent_cache,
3076 struct extent_buffer *leaf, int slot)
3078 struct btrfs_extent_ref_v0 *ref0;
3079 struct btrfs_key key;
3081 btrfs_item_key_to_cpu(leaf, &key, slot);
3082 ref0 = btrfs_item_ptr(leaf, slot, struct btrfs_extent_ref_v0);
3083 if (btrfs_ref_objectid_v0(leaf, ref0) < BTRFS_FIRST_FREE_OBJECTID) {
3084 add_tree_backref(extent_cache, key.objectid, key.offset, 0, 0);
3086 add_data_backref(extent_cache, key.objectid, key.offset, 0,
3087 0, 0, btrfs_ref_count_v0(leaf, ref0), 0, 0);
3093 struct chunk_record *btrfs_new_chunk_record(struct extent_buffer *leaf,
3094 struct btrfs_key *key,
3097 struct btrfs_chunk *ptr;
3098 struct chunk_record *rec;
3101 ptr = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
3102 num_stripes = btrfs_chunk_num_stripes(leaf, ptr);
3104 rec = malloc(btrfs_chunk_record_size(num_stripes));
3106 fprintf(stderr, "memory allocation failed\n");
3110 memset(rec, 0, btrfs_chunk_record_size(num_stripes));
3112 INIT_LIST_HEAD(&rec->list);
3113 INIT_LIST_HEAD(&rec->dextents);
3116 rec->cache.start = key->offset;
3117 rec->cache.size = btrfs_chunk_length(leaf, ptr);
3119 rec->generation = btrfs_header_generation(leaf);
3121 rec->objectid = key->objectid;
3122 rec->type = key->type;
3123 rec->offset = key->offset;
3125 rec->length = rec->cache.size;
3126 rec->owner = btrfs_chunk_owner(leaf, ptr);
3127 rec->stripe_len = btrfs_chunk_stripe_len(leaf, ptr);
3128 rec->type_flags = btrfs_chunk_type(leaf, ptr);
3129 rec->io_width = btrfs_chunk_io_width(leaf, ptr);
3130 rec->io_align = btrfs_chunk_io_align(leaf, ptr);
3131 rec->sector_size = btrfs_chunk_sector_size(leaf, ptr);
3132 rec->num_stripes = num_stripes;
3133 rec->sub_stripes = btrfs_chunk_sub_stripes(leaf, ptr);
3135 for (i = 0; i < rec->num_stripes; ++i) {
3136 rec->stripes[i].devid =
3137 btrfs_stripe_devid_nr(leaf, ptr, i);
3138 rec->stripes[i].offset =
3139 btrfs_stripe_offset_nr(leaf, ptr, i);
3140 read_extent_buffer(leaf, rec->stripes[i].dev_uuid,
3141 (unsigned long)btrfs_stripe_dev_uuid_nr(ptr, i),
3148 static int process_chunk_item(struct cache_tree *chunk_cache,
3149 struct btrfs_key *key, struct extent_buffer *eb,
3152 struct chunk_record *rec;
3155 rec = btrfs_new_chunk_record(eb, key, slot);
3156 ret = insert_cache_extent(chunk_cache, &rec->cache);
3158 fprintf(stderr, "Chunk[%llu, %llu] existed.\n",
3159 rec->offset, rec->length);
3166 static int process_device_item(struct rb_root *dev_cache,
3167 struct btrfs_key *key, struct extent_buffer *eb, int slot)
3169 struct btrfs_dev_item *ptr;
3170 struct device_record *rec;
3173 ptr = btrfs_item_ptr(eb,
3174 slot, struct btrfs_dev_item);
3176 rec = malloc(sizeof(*rec));
3178 fprintf(stderr, "memory allocation failed\n");
3182 rec->devid = key->offset;
3183 rec->generation = btrfs_header_generation(eb);
3185 rec->objectid = key->objectid;
3186 rec->type = key->type;
3187 rec->offset = key->offset;
3189 rec->devid = btrfs_device_id(eb, ptr);
3190 rec->total_byte = btrfs_device_total_bytes(eb, ptr);
3191 rec->byte_used = btrfs_device_bytes_used(eb, ptr);
3193 ret = rb_insert(dev_cache, &rec->node, device_record_compare);
3195 fprintf(stderr, "Device[%llu] existed.\n", rec->devid);
3202 struct block_group_record *
3203 btrfs_new_block_group_record(struct extent_buffer *leaf, struct btrfs_key *key,
3206 struct btrfs_block_group_item *ptr;
3207 struct block_group_record *rec;
3209 rec = malloc(sizeof(*rec));
3211 fprintf(stderr, "memory allocation failed\n");
3214 memset(rec, 0, sizeof(*rec));
3216 rec->cache.start = key->objectid;
3217 rec->cache.size = key->offset;
3219 rec->generation = btrfs_header_generation(leaf);
3221 rec->objectid = key->objectid;
3222 rec->type = key->type;
3223 rec->offset = key->offset;
3225 ptr = btrfs_item_ptr(leaf, slot, struct btrfs_block_group_item);
3226 rec->flags = btrfs_disk_block_group_flags(leaf, ptr);
3228 INIT_LIST_HEAD(&rec->list);
3233 static int process_block_group_item(struct block_group_tree *block_group_cache,
3234 struct btrfs_key *key,
3235 struct extent_buffer *eb, int slot)
3237 struct block_group_record *rec;
3240 rec = btrfs_new_block_group_record(eb, key, slot);
3241 ret = insert_block_group_record(block_group_cache, rec);
3243 fprintf(stderr, "Block Group[%llu, %llu] existed.\n",
3244 rec->objectid, rec->offset);
3251 struct device_extent_record *
3252 btrfs_new_device_extent_record(struct extent_buffer *leaf,
3253 struct btrfs_key *key, int slot)
3255 struct device_extent_record *rec;
3256 struct btrfs_dev_extent *ptr;
3258 rec = malloc(sizeof(*rec));
3260 fprintf(stderr, "memory allocation failed\n");
3263 memset(rec, 0, sizeof(*rec));
3265 rec->cache.objectid = key->objectid;
3266 rec->cache.start = key->offset;
3268 rec->generation = btrfs_header_generation(leaf);
3270 rec->objectid = key->objectid;
3271 rec->type = key->type;
3272 rec->offset = key->offset;
3274 ptr = btrfs_item_ptr(leaf, slot, struct btrfs_dev_extent);
3275 rec->chunk_objecteid =
3276 btrfs_dev_extent_chunk_objectid(leaf, ptr);
3278 btrfs_dev_extent_chunk_offset(leaf, ptr);
3279 rec->length = btrfs_dev_extent_length(leaf, ptr);
3280 rec->cache.size = rec->length;
3282 INIT_LIST_HEAD(&rec->chunk_list);
3283 INIT_LIST_HEAD(&rec->device_list);
3289 process_device_extent_item(struct device_extent_tree *dev_extent_cache,
3290 struct btrfs_key *key, struct extent_buffer *eb,
3293 struct device_extent_record *rec;
3296 rec = btrfs_new_device_extent_record(eb, key, slot);
3297 ret = insert_device_extent_record(dev_extent_cache, rec);
3300 "Device extent[%llu, %llu, %llu] existed.\n",
3301 rec->objectid, rec->offset, rec->length);
3308 static int process_extent_item(struct btrfs_root *root,
3309 struct cache_tree *extent_cache,
3310 struct extent_buffer *eb, int slot)
3312 struct btrfs_extent_item *ei;
3313 struct btrfs_extent_inline_ref *iref;
3314 struct btrfs_extent_data_ref *dref;
3315 struct btrfs_shared_data_ref *sref;
3316 struct btrfs_key key;
3320 u32 item_size = btrfs_item_size_nr(eb, slot);
3326 btrfs_item_key_to_cpu(eb, &key, slot);
3328 if (key.type == BTRFS_METADATA_ITEM_KEY) {
3330 num_bytes = root->leafsize;
3332 num_bytes = key.offset;
3335 if (item_size < sizeof(*ei)) {
3336 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
3337 struct btrfs_extent_item_v0 *ei0;
3338 BUG_ON(item_size != sizeof(*ei0));
3339 ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0);
3340 refs = btrfs_extent_refs_v0(eb, ei0);
3344 return add_extent_rec(extent_cache, NULL, 0, key.objectid,
3345 num_bytes, refs, 0, 0, 0, metadata, 1,
3349 ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
3350 refs = btrfs_extent_refs(eb, ei);
3352 add_extent_rec(extent_cache, NULL, 0, key.objectid, num_bytes,
3353 refs, 0, 0, 0, metadata, 1, num_bytes);
3355 ptr = (unsigned long)(ei + 1);
3356 if (btrfs_extent_flags(eb, ei) & BTRFS_EXTENT_FLAG_TREE_BLOCK &&
3357 key.type == BTRFS_EXTENT_ITEM_KEY)
3358 ptr += sizeof(struct btrfs_tree_block_info);
3360 end = (unsigned long)ei + item_size;
3362 iref = (struct btrfs_extent_inline_ref *)ptr;
3363 type = btrfs_extent_inline_ref_type(eb, iref);
3364 offset = btrfs_extent_inline_ref_offset(eb, iref);
3366 case BTRFS_TREE_BLOCK_REF_KEY:
3367 add_tree_backref(extent_cache, key.objectid,
3370 case BTRFS_SHARED_BLOCK_REF_KEY:
3371 add_tree_backref(extent_cache, key.objectid,
3374 case BTRFS_EXTENT_DATA_REF_KEY:
3375 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
3376 add_data_backref(extent_cache, key.objectid, 0,
3377 btrfs_extent_data_ref_root(eb, dref),
3378 btrfs_extent_data_ref_objectid(eb,
3380 btrfs_extent_data_ref_offset(eb, dref),
3381 btrfs_extent_data_ref_count(eb, dref),
3384 case BTRFS_SHARED_DATA_REF_KEY:
3385 sref = (struct btrfs_shared_data_ref *)(iref + 1);
3386 add_data_backref(extent_cache, key.objectid, offset,
3388 btrfs_shared_data_ref_count(eb, sref),
3392 fprintf(stderr, "corrupt extent record: key %Lu %u %Lu\n",
3393 key.objectid, key.type, num_bytes);
3396 ptr += btrfs_extent_inline_ref_size(type);
3403 static int check_cache_range(struct btrfs_root *root,
3404 struct btrfs_block_group_cache *cache,
3405 u64 offset, u64 bytes)
3407 struct btrfs_free_space *entry;
3413 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
3414 bytenr = btrfs_sb_offset(i);
3415 ret = btrfs_rmap_block(&root->fs_info->mapping_tree,
3416 cache->key.objectid, bytenr, 0,
3417 &logical, &nr, &stripe_len);
3422 if (logical[nr] + stripe_len <= offset)
3424 if (offset + bytes <= logical[nr])
3426 if (logical[nr] == offset) {
3427 if (stripe_len >= bytes) {
3431 bytes -= stripe_len;
3432 offset += stripe_len;
3433 } else if (logical[nr] < offset) {
3434 if (logical[nr] + stripe_len >=
3439 bytes = (offset + bytes) -
3440 (logical[nr] + stripe_len);
3441 offset = logical[nr] + stripe_len;
3444 * Could be tricky, the super may land in the
3445 * middle of the area we're checking. First
3446 * check the easiest case, it's at the end.
3448 if (logical[nr] + stripe_len >=
3450 bytes = logical[nr] - offset;
3454 /* Check the left side */
3455 ret = check_cache_range(root, cache,
3457 logical[nr] - offset);
3463 /* Now we continue with the right side */
3464 bytes = (offset + bytes) -
3465 (logical[nr] + stripe_len);
3466 offset = logical[nr] + stripe_len;
3473 entry = btrfs_find_free_space(cache->free_space_ctl, offset, bytes);
3475 fprintf(stderr, "There is no free space entry for %Lu-%Lu\n",
3476 offset, offset+bytes);
3480 if (entry->offset != offset) {
3481 fprintf(stderr, "Wanted offset %Lu, found %Lu\n", offset,
3486 if (entry->bytes != bytes) {
3487 fprintf(stderr, "Wanted bytes %Lu, found %Lu for off %Lu\n",
3488 bytes, entry->bytes, offset);
3492 unlink_free_space(cache->free_space_ctl, entry);
3497 static int verify_space_cache(struct btrfs_root *root,
3498 struct btrfs_block_group_cache *cache)
3500 struct btrfs_path *path;
3501 struct extent_buffer *leaf;
3502 struct btrfs_key key;
3506 path = btrfs_alloc_path();
3510 root = root->fs_info->extent_root;
3512 last = max_t(u64, cache->key.objectid, BTRFS_SUPER_INFO_OFFSET);
3514 key.objectid = last;
3516 key.type = BTRFS_EXTENT_ITEM_KEY;
3518 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3523 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3524 ret = btrfs_next_leaf(root, path);
3532 leaf = path->nodes[0];
3533 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
3534 if (key.objectid >= cache->key.offset + cache->key.objectid)
3536 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
3537 key.type != BTRFS_METADATA_ITEM_KEY) {
3542 if (last == key.objectid) {
3543 if (key.type == BTRFS_EXTENT_ITEM_KEY)
3544 last = key.objectid + key.offset;
3546 last = key.objectid + root->leafsize;
3551 ret = check_cache_range(root, cache, last,
3552 key.objectid - last);
3555 if (key.type == BTRFS_EXTENT_ITEM_KEY)
3556 last = key.objectid + key.offset;
3558 last = key.objectid + root->leafsize;
3562 if (last < cache->key.objectid + cache->key.offset)
3563 ret = check_cache_range(root, cache, last,
3564 cache->key.objectid +
3565 cache->key.offset - last);
3568 btrfs_free_path(path);
3571 !RB_EMPTY_ROOT(&cache->free_space_ctl->free_space_offset)) {
3572 fprintf(stderr, "There are still entries left in the space "
3580 static int check_space_cache(struct btrfs_root *root)
3582 struct btrfs_block_group_cache *cache;
3583 u64 start = BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE;
3587 if (btrfs_super_cache_generation(root->fs_info->super_copy) != -1ULL &&
3588 btrfs_super_generation(root->fs_info->super_copy) !=
3589 btrfs_super_cache_generation(root->fs_info->super_copy)) {
3590 printf("cache and super generation don't match, space cache "
3591 "will be invalidated\n");
3596 cache = btrfs_lookup_first_block_group(root->fs_info, start);
3600 start = cache->key.objectid + cache->key.offset;
3601 if (!cache->free_space_ctl) {
3602 if (btrfs_init_free_space_ctl(cache,
3603 root->sectorsize)) {
3608 btrfs_remove_free_space_cache(cache);
3611 ret = load_free_space_cache(root->fs_info, cache);
3615 ret = verify_space_cache(root, cache);
3617 fprintf(stderr, "cache appears valid but isnt %Lu\n",
3618 cache->key.objectid);
3623 return error ? -EINVAL : 0;
3626 static int read_extent_data(struct btrfs_root *root, char *data,
3627 u64 logical, u64 *len, int mirror)
3630 struct btrfs_multi_bio *multi = NULL;
3631 struct btrfs_fs_info *info = root->fs_info;
3632 struct btrfs_device *device;
3636 ret = btrfs_map_block(&info->mapping_tree, READ, logical, len,
3637 &multi, mirror, NULL);
3639 fprintf(stderr, "Couldn't map the block %llu\n",
3643 device = multi->stripes[0].dev;
3645 if (device->fd == 0)
3650 ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
3660 static int check_extent_csums(struct btrfs_root *root, u64 bytenr,
3661 u64 num_bytes, unsigned long leaf_offset,
3662 struct extent_buffer *eb) {
3665 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
3667 unsigned long csum_offset;
3671 u64 data_checked = 0;
3677 if (num_bytes % root->sectorsize)
3680 data = malloc(num_bytes);
3684 while (offset < num_bytes) {
3687 read_len = num_bytes - offset;
3688 /* read as much space once a time */
3689 ret = read_extent_data(root, data + offset,
3690 bytenr + offset, &read_len, mirror);
3694 /* verify every 4k data's checksum */
3695 while (data_checked < read_len) {
3697 tmp = offset + data_checked;
3699 csum = btrfs_csum_data(NULL, (char *)data + tmp,
3700 csum, root->sectorsize);
3701 btrfs_csum_final(csum, (char *)&csum);
3703 csum_offset = leaf_offset +
3704 tmp / root->sectorsize * csum_size;
3705 read_extent_buffer(eb, (char *)&csum_expected,
3706 csum_offset, csum_size);
3707 /* try another mirror */
3708 if (csum != csum_expected) {
3709 fprintf(stderr, "mirror %d bytenr %llu csum %u expected csum %u\n",
3710 mirror, bytenr + tmp,
3711 csum, csum_expected);
3712 num_copies = btrfs_num_copies(
3713 &root->fs_info->mapping_tree,
3715 if (mirror < num_copies - 1) {
3720 data_checked += root->sectorsize;
3729 static int check_extent_exists(struct btrfs_root *root, u64 bytenr,
3732 struct btrfs_path *path;
3733 struct extent_buffer *leaf;
3734 struct btrfs_key key;
3737 path = btrfs_alloc_path();
3739 fprintf(stderr, "Error allocing path\n");
3743 key.objectid = bytenr;
3744 key.type = BTRFS_EXTENT_ITEM_KEY;
3749 ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path,
3752 fprintf(stderr, "Error looking up extent record %d\n", ret);
3753 btrfs_free_path(path);
3759 btrfs_prev_leaf(root, path);
3762 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3765 * Block group items come before extent items if they have the same
3766 * bytenr, so walk back one more just in case. Dear future traveler,
3767 * first congrats on mastering time travel. Now if it's not too much
3768 * trouble could you go back to 2006 and tell Chris to make the
3769 * BLOCK_GROUP_ITEM_KEY lower than the EXTENT_ITEM_KEY please?
3771 if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
3775 btrfs_prev_leaf(root, path);
3779 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3780 ret = btrfs_next_leaf(root, path);
3782 fprintf(stderr, "Error going to next leaf "
3784 btrfs_free_path(path);
3790 leaf = path->nodes[0];
3791 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
3792 if (key.type != BTRFS_EXTENT_ITEM_KEY) {
3796 if (key.objectid + key.offset < bytenr) {
3800 if (key.objectid > bytenr + num_bytes)
3803 if (key.objectid == bytenr) {
3804 if (key.offset >= num_bytes) {
3808 num_bytes -= key.offset;
3809 bytenr += key.offset;
3810 } else if (key.objectid < bytenr) {
3811 if (key.objectid + key.offset >= bytenr + num_bytes) {
3815 num_bytes = (bytenr + num_bytes) -
3816 (key.objectid + key.offset);
3817 bytenr = key.objectid + key.offset;
3819 if (key.objectid + key.offset < bytenr + num_bytes) {
3820 u64 new_start = key.objectid + key.offset;
3821 u64 new_bytes = bytenr + num_bytes - new_start;
3824 * Weird case, the extent is in the middle of
3825 * our range, we'll have to search one side
3826 * and then the other. Not sure if this happens
3827 * in real life, but no harm in coding it up
3828 * anyway just in case.
3830 btrfs_release_path(path);
3831 ret = check_extent_exists(root, new_start,
3834 fprintf(stderr, "Right section didn't "
3838 num_bytes = key.objectid - bytenr;
3841 num_bytes = key.objectid - bytenr;
3848 fprintf(stderr, "There are no extents for csum range "
3849 "%Lu-%Lu\n", bytenr, bytenr+num_bytes);
3853 btrfs_free_path(path);
3857 static int check_csums(struct btrfs_root *root)
3859 struct btrfs_path *path;
3860 struct extent_buffer *leaf;
3861 struct btrfs_key key;
3862 u64 offset = 0, num_bytes = 0;
3863 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
3867 unsigned long leaf_offset;
3869 root = root->fs_info->csum_root;
3870 if (!extent_buffer_uptodate(root->node)) {
3871 fprintf(stderr, "No valid csum tree found\n");
3875 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3876 key.type = BTRFS_EXTENT_CSUM_KEY;
3879 path = btrfs_alloc_path();
3883 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3885 fprintf(stderr, "Error searching csum tree %d\n", ret);
3886 btrfs_free_path(path);
3890 if (ret > 0 && path->slots[0])
3895 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3896 ret = btrfs_next_leaf(root, path);
3898 fprintf(stderr, "Error going to next leaf "
3905 leaf = path->nodes[0];
3907 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
3908 if (key.type != BTRFS_EXTENT_CSUM_KEY) {
3913 data_len = (btrfs_item_size_nr(leaf, path->slots[0]) /
3914 csum_size) * root->sectorsize;
3915 if (!check_data_csum)
3916 goto skip_csum_check;
3917 leaf_offset = btrfs_item_ptr_offset(leaf, path->slots[0]);
3918 ret = check_extent_csums(root, key.offset, data_len,
3924 offset = key.offset;
3925 } else if (key.offset != offset + num_bytes) {
3926 ret = check_extent_exists(root, offset, num_bytes);
3928 fprintf(stderr, "Csum exists for %Lu-%Lu but "
3929 "there is no extent record\n",
3930 offset, offset+num_bytes);
3933 offset = key.offset;
3936 num_bytes += data_len;
3940 btrfs_free_path(path);
3944 static int is_dropped_key(struct btrfs_key *key,
3945 struct btrfs_key *drop_key) {
3946 if (key->objectid < drop_key->objectid)
3948 else if (key->objectid == drop_key->objectid) {
3949 if (key->type < drop_key->type)
3951 else if (key->type == drop_key->type) {
3952 if (key->offset < drop_key->offset)
3959 static int run_next_block(struct btrfs_trans_handle *trans,
3960 struct btrfs_root *root,
3961 struct block_info *bits,
3964 struct cache_tree *pending,
3965 struct cache_tree *seen,
3966 struct cache_tree *reada,
3967 struct cache_tree *nodes,
3968 struct cache_tree *extent_cache,
3969 struct cache_tree *chunk_cache,
3970 struct rb_root *dev_cache,
3971 struct block_group_tree *block_group_cache,
3972 struct device_extent_tree *dev_extent_cache,
3973 struct btrfs_root_item *ri)
3975 struct extent_buffer *buf;
3986 struct btrfs_key key;
3987 struct cache_extent *cache;
3990 nritems = pick_next_pending(pending, reada, nodes, *last, bits,
3991 bits_nr, &reada_bits);
3996 for(i = 0; i < nritems; i++) {
3997 ret = add_cache_extent(reada, bits[i].start,
4002 /* fixme, get the parent transid */
4003 readahead_tree_block(root, bits[i].start,
4007 *last = bits[0].start;
4008 bytenr = bits[0].start;
4009 size = bits[0].size;
4011 cache = lookup_cache_extent(pending, bytenr, size);
4013 remove_cache_extent(pending, cache);
4016 cache = lookup_cache_extent(reada, bytenr, size);
4018 remove_cache_extent(reada, cache);
4021 cache = lookup_cache_extent(nodes, bytenr, size);
4023 remove_cache_extent(nodes, cache);
4026 cache = lookup_cache_extent(extent_cache, bytenr, size);
4028 struct extent_record *rec;
4030 rec = container_of(cache, struct extent_record, cache);
4031 gen = rec->parent_generation;
4034 /* fixme, get the real parent transid */
4035 buf = read_tree_block(root, bytenr, size, gen);
4036 if (!extent_buffer_uptodate(buf)) {
4037 record_bad_block_io(root->fs_info,
4038 extent_cache, bytenr, size);
4042 nritems = btrfs_header_nritems(buf);
4045 * FIXME, this only works only if we don't have any full
4048 if (!init_extent_tree) {
4049 ret = btrfs_lookup_extent_info(NULL, root, bytenr,
4050 btrfs_header_level(buf), 1, NULL,
4058 if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
4063 owner = btrfs_header_owner(buf);
4066 ret = check_block(trans, root, extent_cache, buf, flags);
4070 if (btrfs_is_leaf(buf)) {
4071 btree_space_waste += btrfs_leaf_free_space(root, buf);
4072 for (i = 0; i < nritems; i++) {
4073 struct btrfs_file_extent_item *fi;
4074 btrfs_item_key_to_cpu(buf, &key, i);
4075 if (key.type == BTRFS_EXTENT_ITEM_KEY) {
4076 process_extent_item(root, extent_cache, buf,
4080 if (key.type == BTRFS_METADATA_ITEM_KEY) {
4081 process_extent_item(root, extent_cache, buf,
4085 if (key.type == BTRFS_EXTENT_CSUM_KEY) {
4087 btrfs_item_size_nr(buf, i);
4090 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
4091 process_chunk_item(chunk_cache, &key, buf, i);
4094 if (key.type == BTRFS_DEV_ITEM_KEY) {
4095 process_device_item(dev_cache, &key, buf, i);
4098 if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
4099 process_block_group_item(block_group_cache,
4103 if (key.type == BTRFS_DEV_EXTENT_KEY) {
4104 process_device_extent_item(dev_extent_cache,
4109 if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
4110 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
4111 process_extent_ref_v0(extent_cache, buf, i);
4118 if (key.type == BTRFS_TREE_BLOCK_REF_KEY) {
4119 add_tree_backref(extent_cache, key.objectid, 0,
4123 if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) {
4124 add_tree_backref(extent_cache, key.objectid,
4128 if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
4129 struct btrfs_extent_data_ref *ref;
4130 ref = btrfs_item_ptr(buf, i,
4131 struct btrfs_extent_data_ref);
4132 add_data_backref(extent_cache,
4134 btrfs_extent_data_ref_root(buf, ref),
4135 btrfs_extent_data_ref_objectid(buf,
4137 btrfs_extent_data_ref_offset(buf, ref),
4138 btrfs_extent_data_ref_count(buf, ref),
4139 0, root->sectorsize);
4142 if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
4143 struct btrfs_shared_data_ref *ref;
4144 ref = btrfs_item_ptr(buf, i,
4145 struct btrfs_shared_data_ref);
4146 add_data_backref(extent_cache,
4147 key.objectid, key.offset, 0, 0, 0,
4148 btrfs_shared_data_ref_count(buf, ref),
4149 0, root->sectorsize);
4152 if (key.type == BTRFS_ORPHAN_ITEM_KEY) {
4153 struct bad_item *bad;
4155 if (key.objectid == BTRFS_ORPHAN_OBJECTID)
4159 bad = malloc(sizeof(struct bad_item));
4162 INIT_LIST_HEAD(&bad->list);
4163 memcpy(&bad->key, &key,
4164 sizeof(struct btrfs_key));
4165 bad->root_id = owner;
4166 list_add_tail(&bad->list, &delete_items);
4169 if (key.type != BTRFS_EXTENT_DATA_KEY)
4171 fi = btrfs_item_ptr(buf, i,
4172 struct btrfs_file_extent_item);
4173 if (btrfs_file_extent_type(buf, fi) ==
4174 BTRFS_FILE_EXTENT_INLINE)
4176 if (btrfs_file_extent_disk_bytenr(buf, fi) == 0)
4179 data_bytes_allocated +=
4180 btrfs_file_extent_disk_num_bytes(buf, fi);
4181 if (data_bytes_allocated < root->sectorsize) {
4184 data_bytes_referenced +=
4185 btrfs_file_extent_num_bytes(buf, fi);
4186 add_data_backref(extent_cache,
4187 btrfs_file_extent_disk_bytenr(buf, fi),
4188 parent, owner, key.objectid, key.offset -
4189 btrfs_file_extent_offset(buf, fi), 1, 1,
4190 btrfs_file_extent_disk_num_bytes(buf, fi));
4194 struct btrfs_key first_key;
4196 first_key.objectid = 0;
4199 btrfs_item_key_to_cpu(buf, &first_key, 0);
4200 level = btrfs_header_level(buf);
4201 for (i = 0; i < nritems; i++) {
4202 ptr = btrfs_node_blockptr(buf, i);
4203 size = btrfs_level_size(root, level - 1);
4204 btrfs_node_key_to_cpu(buf, &key, i);
4206 struct btrfs_key drop_key;
4207 btrfs_disk_key_to_cpu(&drop_key,
4208 &ri->drop_progress);
4209 if ((level == ri->drop_level)
4210 && is_dropped_key(&key, &drop_key)) {
4214 ret = add_extent_rec(extent_cache, &key,
4215 btrfs_node_ptr_generation(buf, i),
4216 ptr, size, 0, 0, 1, 0, 1, 0,
4220 add_tree_backref(extent_cache, ptr, parent, owner, 1);
4223 add_pending(nodes, seen, ptr, size);
4225 add_pending(pending, seen, ptr, size);
4228 btree_space_waste += (BTRFS_NODEPTRS_PER_BLOCK(root) -
4229 nritems) * sizeof(struct btrfs_key_ptr);
4231 total_btree_bytes += buf->len;
4232 if (fs_root_objectid(btrfs_header_owner(buf)))
4233 total_fs_tree_bytes += buf->len;
4234 if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID)
4235 total_extent_tree_bytes += buf->len;
4236 if (!found_old_backref &&
4237 btrfs_header_owner(buf) == BTRFS_TREE_RELOC_OBJECTID &&
4238 btrfs_header_backref_rev(buf) == BTRFS_MIXED_BACKREF_REV &&
4239 !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC))
4240 found_old_backref = 1;
4242 free_extent_buffer(buf);
4246 static int add_root_to_pending(struct extent_buffer *buf,
4247 struct cache_tree *extent_cache,
4248 struct cache_tree *pending,
4249 struct cache_tree *seen,
4250 struct cache_tree *nodes,
4251 struct btrfs_key *root_key)
4253 if (btrfs_header_level(buf) > 0)
4254 add_pending(nodes, seen, buf->start, buf->len);
4256 add_pending(pending, seen, buf->start, buf->len);
4257 add_extent_rec(extent_cache, NULL, 0, buf->start, buf->len,
4258 0, 1, 1, 0, 1, 0, buf->len);
4260 if (root_key->objectid == BTRFS_TREE_RELOC_OBJECTID ||
4261 btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
4262 add_tree_backref(extent_cache, buf->start, buf->start,
4265 add_tree_backref(extent_cache, buf->start, 0,
4266 root_key->objectid, 1);
4270 /* as we fix the tree, we might be deleting blocks that
4271 * we're tracking for repair. This hook makes sure we
4272 * remove any backrefs for blocks as we are fixing them.
4274 static int free_extent_hook(struct btrfs_trans_handle *trans,
4275 struct btrfs_root *root,
4276 u64 bytenr, u64 num_bytes, u64 parent,
4277 u64 root_objectid, u64 owner, u64 offset,
4280 struct extent_record *rec;
4281 struct cache_extent *cache;
4283 struct cache_tree *extent_cache = root->fs_info->fsck_extent_cache;
4285 is_data = owner >= BTRFS_FIRST_FREE_OBJECTID;
4286 cache = lookup_cache_extent(extent_cache, bytenr, num_bytes);
4290 rec = container_of(cache, struct extent_record, cache);
4292 struct data_backref *back;
4293 back = find_data_backref(rec, parent, root_objectid, owner,
4294 offset, 1, bytenr, num_bytes);
4297 if (back->node.found_ref) {
4298 back->found_ref -= refs_to_drop;
4300 rec->refs -= refs_to_drop;
4302 if (back->node.found_extent_tree) {
4303 back->num_refs -= refs_to_drop;
4304 if (rec->extent_item_refs)
4305 rec->extent_item_refs -= refs_to_drop;
4307 if (back->found_ref == 0)
4308 back->node.found_ref = 0;
4309 if (back->num_refs == 0)
4310 back->node.found_extent_tree = 0;
4312 if (!back->node.found_extent_tree && back->node.found_ref) {
4313 list_del(&back->node.list);
4317 struct tree_backref *back;
4318 back = find_tree_backref(rec, parent, root_objectid);
4321 if (back->node.found_ref) {
4324 back->node.found_ref = 0;
4326 if (back->node.found_extent_tree) {
4327 if (rec->extent_item_refs)
4328 rec->extent_item_refs--;
4329 back->node.found_extent_tree = 0;
4331 if (!back->node.found_extent_tree && back->node.found_ref) {
4332 list_del(&back->node.list);
4336 maybe_free_extent_rec(extent_cache, rec);
4341 static int delete_extent_records(struct btrfs_trans_handle *trans,
4342 struct btrfs_root *root,
4343 struct btrfs_path *path,
4344 u64 bytenr, u64 new_len)
4346 struct btrfs_key key;
4347 struct btrfs_key found_key;
4348 struct extent_buffer *leaf;
4353 key.objectid = bytenr;
4355 key.offset = (u64)-1;
4358 ret = btrfs_search_slot(trans, root->fs_info->extent_root,
4365 if (path->slots[0] == 0)
4371 leaf = path->nodes[0];
4372 slot = path->slots[0];
4374 btrfs_item_key_to_cpu(leaf, &found_key, slot);
4375 if (found_key.objectid != bytenr)
4378 if (found_key.type != BTRFS_EXTENT_ITEM_KEY &&
4379 found_key.type != BTRFS_METADATA_ITEM_KEY &&
4380 found_key.type != BTRFS_TREE_BLOCK_REF_KEY &&
4381 found_key.type != BTRFS_EXTENT_DATA_REF_KEY &&
4382 found_key.type != BTRFS_EXTENT_REF_V0_KEY &&
4383 found_key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
4384 found_key.type != BTRFS_SHARED_DATA_REF_KEY) {
4385 btrfs_release_path(path);
4386 if (found_key.type == 0) {
4387 if (found_key.offset == 0)
4389 key.offset = found_key.offset - 1;
4390 key.type = found_key.type;
4392 key.type = found_key.type - 1;
4393 key.offset = (u64)-1;
4397 fprintf(stderr, "repair deleting extent record: key %Lu %u %Lu\n",
4398 found_key.objectid, found_key.type, found_key.offset);
4400 ret = btrfs_del_item(trans, root->fs_info->extent_root, path);
4403 btrfs_release_path(path);
4405 if (found_key.type == BTRFS_EXTENT_ITEM_KEY ||
4406 found_key.type == BTRFS_METADATA_ITEM_KEY) {
4407 u64 bytes = (found_key.type == BTRFS_EXTENT_ITEM_KEY) ?
4408 found_key.offset : root->leafsize;
4410 ret = btrfs_update_block_group(trans, root, bytenr,
4417 btrfs_release_path(path);
4422 * for a single backref, this will allocate a new extent
4423 * and add the backref to it.
4425 static int record_extent(struct btrfs_trans_handle *trans,
4426 struct btrfs_fs_info *info,
4427 struct btrfs_path *path,
4428 struct extent_record *rec,
4429 struct extent_backref *back,
4430 int allocated, u64 flags)
4433 struct btrfs_root *extent_root = info->extent_root;
4434 struct extent_buffer *leaf;
4435 struct btrfs_key ins_key;
4436 struct btrfs_extent_item *ei;
4437 struct tree_backref *tback;
4438 struct data_backref *dback;
4439 struct btrfs_tree_block_info *bi;
4442 rec->max_size = max_t(u64, rec->max_size,
4443 info->extent_root->leafsize);
4446 u32 item_size = sizeof(*ei);
4449 item_size += sizeof(*bi);
4451 ins_key.objectid = rec->start;
4452 ins_key.offset = rec->max_size;
4453 ins_key.type = BTRFS_EXTENT_ITEM_KEY;
4455 ret = btrfs_insert_empty_item(trans, extent_root, path,
4456 &ins_key, item_size);
4460 leaf = path->nodes[0];
4461 ei = btrfs_item_ptr(leaf, path->slots[0],
4462 struct btrfs_extent_item);
4464 btrfs_set_extent_refs(leaf, ei, 0);
4465 btrfs_set_extent_generation(leaf, ei, rec->generation);
4467 if (back->is_data) {
4468 btrfs_set_extent_flags(leaf, ei,
4469 BTRFS_EXTENT_FLAG_DATA);
4471 struct btrfs_disk_key copy_key;;
4473 tback = (struct tree_backref *)back;
4474 bi = (struct btrfs_tree_block_info *)(ei + 1);
4475 memset_extent_buffer(leaf, 0, (unsigned long)bi,
4478 btrfs_set_disk_key_objectid(©_key,
4479 rec->info_objectid);
4480 btrfs_set_disk_key_type(©_key, 0);
4481 btrfs_set_disk_key_offset(©_key, 0);
4483 btrfs_set_tree_block_level(leaf, bi, rec->info_level);
4484 btrfs_set_tree_block_key(leaf, bi, ©_key);
4486 btrfs_set_extent_flags(leaf, ei,
4487 BTRFS_EXTENT_FLAG_TREE_BLOCK | flags);
4490 btrfs_mark_buffer_dirty(leaf);
4491 ret = btrfs_update_block_group(trans, extent_root, rec->start,
4492 rec->max_size, 1, 0);
4495 btrfs_release_path(path);
4498 if (back->is_data) {
4502 dback = (struct data_backref *)back;
4503 if (back->full_backref)
4504 parent = dback->parent;
4508 for (i = 0; i < dback->found_ref; i++) {
4509 /* if parent != 0, we're doing a full backref
4510 * passing BTRFS_FIRST_FREE_OBJECTID as the owner
4511 * just makes the backref allocator create a data
4514 ret = btrfs_inc_extent_ref(trans, info->extent_root,
4515 rec->start, rec->max_size,
4519 BTRFS_FIRST_FREE_OBJECTID :
4525 fprintf(stderr, "adding new data backref"
4526 " on %llu %s %llu owner %llu"
4527 " offset %llu found %d\n",
4528 (unsigned long long)rec->start,
4529 back->full_backref ?
4531 back->full_backref ?
4532 (unsigned long long)parent :
4533 (unsigned long long)dback->root,
4534 (unsigned long long)dback->owner,
4535 (unsigned long long)dback->offset,
4540 tback = (struct tree_backref *)back;
4541 if (back->full_backref)
4542 parent = tback->parent;
4546 ret = btrfs_inc_extent_ref(trans, info->extent_root,
4547 rec->start, rec->max_size,
4548 parent, tback->root, 0, 0);
4549 fprintf(stderr, "adding new tree backref on "
4550 "start %llu len %llu parent %llu root %llu\n",
4551 rec->start, rec->max_size, tback->parent, tback->root);
4556 btrfs_release_path(path);
4560 struct extent_entry {
4565 struct list_head list;
4568 static struct extent_entry *find_entry(struct list_head *entries,
4569 u64 bytenr, u64 bytes)
4571 struct extent_entry *entry = NULL;
4573 list_for_each_entry(entry, entries, list) {
4574 if (entry->bytenr == bytenr && entry->bytes == bytes)
4581 static struct extent_entry *find_most_right_entry(struct list_head *entries)
4583 struct extent_entry *entry, *best = NULL, *prev = NULL;
4585 list_for_each_entry(entry, entries, list) {
4592 * If there are as many broken entries as entries then we know
4593 * not to trust this particular entry.
4595 if (entry->broken == entry->count)
4599 * If our current entry == best then we can't be sure our best
4600 * is really the best, so we need to keep searching.
4602 if (best && best->count == entry->count) {
4608 /* Prev == entry, not good enough, have to keep searching */
4609 if (!prev->broken && prev->count == entry->count)
4613 best = (prev->count > entry->count) ? prev : entry;
4614 else if (best->count < entry->count)
4622 static int repair_ref(struct btrfs_trans_handle *trans,
4623 struct btrfs_fs_info *info, struct btrfs_path *path,
4624 struct data_backref *dback, struct extent_entry *entry)
4626 struct btrfs_root *root;
4627 struct btrfs_file_extent_item *fi;
4628 struct extent_buffer *leaf;
4629 struct btrfs_key key;
4633 key.objectid = dback->root;
4634 key.type = BTRFS_ROOT_ITEM_KEY;
4635 key.offset = (u64)-1;
4636 root = btrfs_read_fs_root(info, &key);
4638 fprintf(stderr, "Couldn't find root for our ref\n");
4643 * The backref points to the original offset of the extent if it was
4644 * split, so we need to search down to the offset we have and then walk
4645 * forward until we find the backref we're looking for.
4647 key.objectid = dback->owner;
4648 key.type = BTRFS_EXTENT_DATA_KEY;
4649 key.offset = dback->offset;
4650 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
4652 fprintf(stderr, "Error looking up ref %d\n", ret);
4657 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
4658 ret = btrfs_next_leaf(root, path);
4660 fprintf(stderr, "Couldn't find our ref, next\n");
4664 leaf = path->nodes[0];
4665 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
4666 if (key.objectid != dback->owner ||
4667 key.type != BTRFS_EXTENT_DATA_KEY) {
4668 fprintf(stderr, "Couldn't find our ref, search\n");
4671 fi = btrfs_item_ptr(leaf, path->slots[0],
4672 struct btrfs_file_extent_item);
4673 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
4674 bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
4676 if (bytenr == dback->disk_bytenr && bytes == dback->bytes)
4681 btrfs_release_path(path);
4684 * Have to make sure that this root gets updated when we commit the
4687 record_root_in_trans(trans, root);
4690 * Ok we have the key of the file extent we want to fix, now we can cow
4691 * down to the thing and fix it.
4693 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
4695 fprintf(stderr, "Error cowing down to ref [%Lu, %u, %Lu]: %d\n",
4696 key.objectid, key.type, key.offset, ret);
4700 fprintf(stderr, "Well that's odd, we just found this key "
4701 "[%Lu, %u, %Lu]\n", key.objectid, key.type,
4705 leaf = path->nodes[0];
4706 fi = btrfs_item_ptr(leaf, path->slots[0],
4707 struct btrfs_file_extent_item);
4709 if (btrfs_file_extent_compression(leaf, fi) &&
4710 dback->disk_bytenr != entry->bytenr) {
4711 fprintf(stderr, "Ref doesn't match the record start and is "
4712 "compressed, please take a btrfs-image of this file "
4713 "system and send it to a btrfs developer so they can "
4714 "complete this functionality for bytenr %Lu\n",
4715 dback->disk_bytenr);
4719 if (dback->node.broken && dback->disk_bytenr != entry->bytenr) {
4720 btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr);
4721 } else if (dback->disk_bytenr > entry->bytenr) {
4722 u64 off_diff, offset;
4724 off_diff = dback->disk_bytenr - entry->bytenr;
4725 offset = btrfs_file_extent_offset(leaf, fi);
4726 if (dback->disk_bytenr + offset +
4727 btrfs_file_extent_num_bytes(leaf, fi) >
4728 entry->bytenr + entry->bytes) {
4729 fprintf(stderr, "Ref is past the entry end, please "
4730 "take a btrfs-image of this file system and "
4731 "send it to a btrfs developer, ref %Lu\n",
4732 dback->disk_bytenr);
4736 btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr);
4737 btrfs_set_file_extent_offset(leaf, fi, offset);
4738 } else if (dback->disk_bytenr < entry->bytenr) {
4741 offset = btrfs_file_extent_offset(leaf, fi);
4742 if (dback->disk_bytenr + offset < entry->bytenr) {
4743 fprintf(stderr, "Ref is before the entry start, please"
4744 " take a btrfs-image of this file system and "
4745 "send it to a btrfs developer, ref %Lu\n",
4746 dback->disk_bytenr);
4750 offset += dback->disk_bytenr;
4751 offset -= entry->bytenr;
4752 btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr);
4753 btrfs_set_file_extent_offset(leaf, fi, offset);
4756 btrfs_set_file_extent_disk_num_bytes(leaf, fi, entry->bytes);
4759 * Chances are if disk_num_bytes were wrong then so is ram_bytes, but
4760 * only do this if we aren't using compression, otherwise it's a
4763 if (!btrfs_file_extent_compression(leaf, fi))
4764 btrfs_set_file_extent_ram_bytes(leaf, fi, entry->bytes);
4766 printf("ram bytes may be wrong?\n");
4767 btrfs_mark_buffer_dirty(leaf);
4768 btrfs_release_path(path);
4772 static int verify_backrefs(struct btrfs_trans_handle *trans,
4773 struct btrfs_fs_info *info, struct btrfs_path *path,
4774 struct extent_record *rec)
4776 struct extent_backref *back;
4777 struct data_backref *dback;
4778 struct extent_entry *entry, *best = NULL;
4781 int broken_entries = 0;
4786 * Metadata is easy and the backrefs should always agree on bytenr and
4787 * size, if not we've got bigger issues.
4792 list_for_each_entry(back, &rec->backrefs, list) {
4793 dback = (struct data_backref *)back;
4795 * We only pay attention to backrefs that we found a real
4798 if (dback->found_ref == 0)
4800 if (back->full_backref)
4804 * For now we only catch when the bytes don't match, not the
4805 * bytenr. We can easily do this at the same time, but I want
4806 * to have a fs image to test on before we just add repair
4807 * functionality willy-nilly so we know we won't screw up the
4811 entry = find_entry(&entries, dback->disk_bytenr,
4814 entry = malloc(sizeof(struct extent_entry));
4819 memset(entry, 0, sizeof(*entry));
4820 entry->bytenr = dback->disk_bytenr;
4821 entry->bytes = dback->bytes;
4822 list_add_tail(&entry->list, &entries);
4827 * If we only have on entry we may think the entries agree when
4828 * in reality they don't so we have to do some extra checking.
4830 if (dback->disk_bytenr != rec->start ||
4831 dback->bytes != rec->nr || back->broken)
4842 /* Yay all the backrefs agree, carry on good sir */
4843 if (nr_entries <= 1 && !mismatch)
4846 fprintf(stderr, "attempting to repair backref discrepency for bytenr "
4847 "%Lu\n", rec->start);
4850 * First we want to see if the backrefs can agree amongst themselves who
4851 * is right, so figure out which one of the entries has the highest
4854 best = find_most_right_entry(&entries);
4857 * Ok so we may have an even split between what the backrefs think, so
4858 * this is where we use the extent ref to see what it thinks.
4861 entry = find_entry(&entries, rec->start, rec->nr);
4862 if (!entry && (!broken_entries || !rec->found_rec)) {
4863 fprintf(stderr, "Backrefs don't agree with each other "
4864 "and extent record doesn't agree with anybody,"
4865 " so we can't fix bytenr %Lu bytes %Lu\n",
4866 rec->start, rec->nr);
4869 } else if (!entry) {
4871 * Ok our backrefs were broken, we'll assume this is the
4872 * correct value and add an entry for this range.
4874 entry = malloc(sizeof(struct extent_entry));
4879 memset(entry, 0, sizeof(*entry));
4880 entry->bytenr = rec->start;
4881 entry->bytes = rec->nr;
4882 list_add_tail(&entry->list, &entries);
4886 best = find_most_right_entry(&entries);
4888 fprintf(stderr, "Backrefs and extent record evenly "
4889 "split on who is right, this is going to "
4890 "require user input to fix bytenr %Lu bytes "
4891 "%Lu\n", rec->start, rec->nr);
4898 * I don't think this can happen currently as we'll abort() if we catch
4899 * this case higher up, but in case somebody removes that we still can't
4900 * deal with it properly here yet, so just bail out of that's the case.
4902 if (best->bytenr != rec->start) {
4903 fprintf(stderr, "Extent start and backref starts don't match, "
4904 "please use btrfs-image on this file system and send "
4905 "it to a btrfs developer so they can make fsck fix "
4906 "this particular case. bytenr is %Lu, bytes is %Lu\n",
4907 rec->start, rec->nr);
4913 * Ok great we all agreed on an extent record, let's go find the real
4914 * references and fix up the ones that don't match.
4916 list_for_each_entry(back, &rec->backrefs, list) {
4917 dback = (struct data_backref *)back;
4920 * Still ignoring backrefs that don't have a real ref attached
4923 if (dback->found_ref == 0)
4925 if (back->full_backref)
4928 if (dback->bytes == best->bytes &&
4929 dback->disk_bytenr == best->bytenr)
4932 ret = repair_ref(trans, info, path, dback, best);
4938 * Ok we messed with the actual refs, which means we need to drop our
4939 * entire cache and go back and rescan. I know this is a huge pain and
4940 * adds a lot of extra work, but it's the only way to be safe. Once all
4941 * the backrefs agree we may not need to do anything to the extent
4946 while (!list_empty(&entries)) {
4947 entry = list_entry(entries.next, struct extent_entry, list);
4948 list_del_init(&entry->list);
4954 static int process_duplicates(struct btrfs_root *root,
4955 struct cache_tree *extent_cache,
4956 struct extent_record *rec)
4958 struct extent_record *good, *tmp;
4959 struct cache_extent *cache;
4963 * If we found a extent record for this extent then return, or if we
4964 * have more than one duplicate we are likely going to need to delete
4967 if (rec->found_rec || rec->num_duplicates > 1)
4970 /* Shouldn't happen but just in case */
4971 BUG_ON(!rec->num_duplicates);
4974 * So this happens if we end up with a backref that doesn't match the
4975 * actual extent entry. So either the backref is bad or the extent
4976 * entry is bad. Either way we want to have the extent_record actually
4977 * reflect what we found in the extent_tree, so we need to take the
4978 * duplicate out and use that as the extent_record since the only way we
4979 * get a duplicate is if we find a real life BTRFS_EXTENT_ITEM_KEY.
4981 remove_cache_extent(extent_cache, &rec->cache);
4983 good = list_entry(rec->dups.next, struct extent_record, list);
4984 list_del_init(&good->list);
4985 INIT_LIST_HEAD(&good->backrefs);
4986 INIT_LIST_HEAD(&good->dups);
4987 good->cache.start = good->start;
4988 good->cache.size = good->nr;
4989 good->content_checked = 0;
4990 good->owner_ref_checked = 0;
4991 good->num_duplicates = 0;
4992 good->refs = rec->refs;
4993 list_splice_init(&rec->backrefs, &good->backrefs);
4995 cache = lookup_cache_extent(extent_cache, good->start,
4999 tmp = container_of(cache, struct extent_record, cache);
5002 * If we find another overlapping extent and it's found_rec is
5003 * set then it's a duplicate and we need to try and delete
5006 if (tmp->found_rec || tmp->num_duplicates > 0) {
5007 if (list_empty(&good->list))
5008 list_add_tail(&good->list,
5009 &duplicate_extents);
5010 good->num_duplicates += tmp->num_duplicates + 1;
5011 list_splice_init(&tmp->dups, &good->dups);
5012 list_del_init(&tmp->list);
5013 list_add_tail(&tmp->list, &good->dups);
5014 remove_cache_extent(extent_cache, &tmp->cache);
5019 * Ok we have another non extent item backed extent rec, so lets
5020 * just add it to this extent and carry on like we did above.
5022 good->refs += tmp->refs;
5023 list_splice_init(&tmp->backrefs, &good->backrefs);
5024 remove_cache_extent(extent_cache, &tmp->cache);
5027 ret = insert_cache_extent(extent_cache, &good->cache);
5030 return good->num_duplicates ? 0 : 1;
5033 static int delete_duplicate_records(struct btrfs_trans_handle *trans,
5034 struct btrfs_root *root,
5035 struct extent_record *rec)
5037 LIST_HEAD(delete_list);
5038 struct btrfs_path *path;
5039 struct extent_record *tmp, *good, *n;
5042 struct btrfs_key key;
5044 path = btrfs_alloc_path();
5051 /* Find the record that covers all of the duplicates. */
5052 list_for_each_entry(tmp, &rec->dups, list) {
5053 if (good->start < tmp->start)
5055 if (good->nr > tmp->nr)
5058 if (tmp->start + tmp->nr < good->start + good->nr) {
5059 fprintf(stderr, "Ok we have overlapping extents that "
5060 "aren't completely covered by eachother, this "
5061 "is going to require more careful thought. "
5062 "The extents are [%Lu-%Lu] and [%Lu-%Lu]\n",
5063 tmp->start, tmp->nr, good->start, good->nr);
5070 list_add_tail(&rec->list, &delete_list);
5072 list_for_each_entry_safe(tmp, n, &rec->dups, list) {
5075 list_move_tail(&tmp->list, &delete_list);
5078 root = root->fs_info->extent_root;
5079 list_for_each_entry(tmp, &delete_list, list) {
5080 if (tmp->found_rec == 0)
5082 key.objectid = tmp->start;
5083 key.type = BTRFS_EXTENT_ITEM_KEY;
5084 key.offset = tmp->nr;
5086 /* Shouldn't happen but just in case */
5087 if (tmp->metadata) {
5088 fprintf(stderr, "Well this shouldn't happen, extent "
5089 "record overlaps but is metadata? "
5090 "[%Lu, %Lu]\n", tmp->start, tmp->nr);
5094 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
5100 ret = btrfs_del_item(trans, root, path);
5103 btrfs_release_path(path);
5108 while (!list_empty(&delete_list)) {
5109 tmp = list_entry(delete_list.next, struct extent_record, list);
5110 list_del_init(&tmp->list);
5116 while (!list_empty(&rec->dups)) {
5117 tmp = list_entry(rec->dups.next, struct extent_record, list);
5118 list_del_init(&tmp->list);
5122 btrfs_free_path(path);
5124 if (!ret && !nr_del)
5125 rec->num_duplicates = 0;
5127 return ret ? ret : nr_del;
5130 static int find_possible_backrefs(struct btrfs_trans_handle *trans,
5131 struct btrfs_fs_info *info,
5132 struct btrfs_path *path,
5133 struct cache_tree *extent_cache,
5134 struct extent_record *rec)
5136 struct btrfs_root *root;
5137 struct extent_backref *back;
5138 struct data_backref *dback;
5139 struct cache_extent *cache;
5140 struct btrfs_file_extent_item *fi;
5141 struct btrfs_key key;
5145 list_for_each_entry(back, &rec->backrefs, list) {
5146 dback = (struct data_backref *)back;
5148 /* We found this one, we don't need to do a lookup */
5149 if (dback->found_ref)
5151 /* Don't care about full backrefs (poor unloved backrefs) */
5152 if (back->full_backref)
5154 key.objectid = dback->root;
5155 key.type = BTRFS_ROOT_ITEM_KEY;
5156 key.offset = (u64)-1;
5158 root = btrfs_read_fs_root(info, &key);
5160 /* No root, definitely a bad ref, skip */
5161 if (IS_ERR(root) && PTR_ERR(root) == -ENOENT)
5163 /* Other err, exit */
5165 return PTR_ERR(root);
5167 key.objectid = dback->owner;
5168 key.type = BTRFS_EXTENT_DATA_KEY;
5169 key.offset = dback->offset;
5170 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
5172 btrfs_release_path(path);
5175 /* Didn't find it, we can carry on */
5180 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
5181 struct btrfs_file_extent_item);
5182 bytenr = btrfs_file_extent_disk_bytenr(path->nodes[0], fi);
5183 bytes = btrfs_file_extent_disk_num_bytes(path->nodes[0], fi);
5184 btrfs_release_path(path);
5185 cache = lookup_cache_extent(extent_cache, bytenr, 1);
5187 struct extent_record *tmp;
5188 tmp = container_of(cache, struct extent_record, cache);
5191 * If we found an extent record for the bytenr for this
5192 * particular backref then we can't add it to our
5193 * current extent record. We only want to add backrefs
5194 * that don't have a corresponding extent item in the
5195 * extent tree since they likely belong to this record
5196 * and we need to fix it if it doesn't match bytenrs.
5202 dback->found_ref += 1;
5203 dback->disk_bytenr = bytenr;
5204 dback->bytes = bytes;
5207 * Set this so the verify backref code knows not to trust the
5208 * values in this backref.
5217 * when an incorrect extent item is found, this will delete
5218 * all of the existing entries for it and recreate them
5219 * based on what the tree scan found.
5221 static int fixup_extent_refs(struct btrfs_trans_handle *trans,
5222 struct btrfs_fs_info *info,
5223 struct cache_tree *extent_cache,
5224 struct extent_record *rec)
5227 struct btrfs_path *path;
5228 struct list_head *cur = rec->backrefs.next;
5229 struct cache_extent *cache;
5230 struct extent_backref *back;
5235 * remember our flags for recreating the extent.
5236 * FIXME, if we have cleared extent tree, we can not
5237 * lookup extent info in extent tree.
5239 if (!init_extent_tree) {
5240 ret = btrfs_lookup_extent_info(NULL, info->extent_root,
5241 rec->start, rec->max_size,
5242 rec->metadata, NULL, &flags);
5249 path = btrfs_alloc_path();
5253 if (rec->refs != rec->extent_item_refs && !rec->metadata) {
5255 * Sometimes the backrefs themselves are so broken they don't
5256 * get attached to any meaningful rec, so first go back and
5257 * check any of our backrefs that we couldn't find and throw
5258 * them into the list if we find the backref so that
5259 * verify_backrefs can figure out what to do.
5261 ret = find_possible_backrefs(trans, info, path, extent_cache,
5267 /* step one, make sure all of the backrefs agree */
5268 ret = verify_backrefs(trans, info, path, rec);
5272 /* step two, delete all the existing records */
5273 ret = delete_extent_records(trans, info->extent_root, path,
5274 rec->start, rec->max_size);
5279 /* was this block corrupt? If so, don't add references to it */
5280 cache = lookup_cache_extent(info->corrupt_blocks,
5281 rec->start, rec->max_size);
5287 /* step three, recreate all the refs we did find */
5288 while(cur != &rec->backrefs) {
5289 back = list_entry(cur, struct extent_backref, list);
5293 * if we didn't find any references, don't create a
5296 if (!back->found_ref)
5299 ret = record_extent(trans, info, path, rec, back, allocated, flags);
5306 btrfs_free_path(path);
5310 /* right now we only prune from the extent allocation tree */
5311 static int prune_one_block(struct btrfs_trans_handle *trans,
5312 struct btrfs_fs_info *info,
5313 struct btrfs_corrupt_block *corrupt)
5316 struct btrfs_path path;
5317 struct extent_buffer *eb;
5321 int level = corrupt->level + 1;
5323 btrfs_init_path(&path);
5325 /* we want to stop at the parent to our busted block */
5326 path.lowest_level = level;
5328 ret = btrfs_search_slot(trans, info->extent_root,
5329 &corrupt->key, &path, -1, 1);
5334 eb = path.nodes[level];
5341 * hopefully the search gave us the block we want to prune,
5342 * lets try that first
5344 slot = path.slots[level];
5345 found = btrfs_node_blockptr(eb, slot);
5346 if (found == corrupt->cache.start)
5349 nritems = btrfs_header_nritems(eb);
5351 /* the search failed, lets scan this node and hope we find it */
5352 for (slot = 0; slot < nritems; slot++) {
5353 found = btrfs_node_blockptr(eb, slot);
5354 if (found == corrupt->cache.start)
5358 * we couldn't find the bad block. TODO, search all the nodes for pointers
5361 if (eb == info->extent_root->node) {
5366 btrfs_release_path(&path);
5371 printk("deleting pointer to block %Lu\n", corrupt->cache.start);
5372 ret = btrfs_del_ptr(trans, info->extent_root, &path, level, slot);
5375 btrfs_release_path(&path);
5379 static int prune_corrupt_blocks(struct btrfs_trans_handle *trans,
5380 struct btrfs_fs_info *info)
5382 struct cache_extent *cache;
5383 struct btrfs_corrupt_block *corrupt;
5385 cache = search_cache_extent(info->corrupt_blocks, 0);
5389 corrupt = container_of(cache, struct btrfs_corrupt_block, cache);
5390 prune_one_block(trans, info, corrupt);
5391 cache = next_cache_extent(cache);
5396 static void free_corrupt_block(struct cache_extent *cache)
5398 struct btrfs_corrupt_block *corrupt;
5400 corrupt = container_of(cache, struct btrfs_corrupt_block, cache);
5404 FREE_EXTENT_CACHE_BASED_TREE(corrupt_blocks, free_corrupt_block);
5406 static void reset_cached_block_groups(struct btrfs_fs_info *fs_info)
5408 struct btrfs_block_group_cache *cache;
5413 ret = find_first_extent_bit(&fs_info->free_space_cache, 0,
5414 &start, &end, EXTENT_DIRTY);
5417 clear_extent_dirty(&fs_info->free_space_cache, start, end,
5423 cache = btrfs_lookup_first_block_group(fs_info, start);
5428 start = cache->key.objectid + cache->key.offset;
5432 static int check_extent_refs(struct btrfs_trans_handle *trans,
5433 struct btrfs_root *root,
5434 struct cache_tree *extent_cache)
5436 struct extent_record *rec;
5437 struct cache_extent *cache;
5445 * if we're doing a repair, we have to make sure
5446 * we don't allocate from the problem extents.
5447 * In the worst case, this will be all the
5450 cache = search_cache_extent(extent_cache, 0);
5452 rec = container_of(cache, struct extent_record, cache);
5453 btrfs_pin_extent(root->fs_info,
5454 rec->start, rec->max_size);
5455 cache = next_cache_extent(cache);
5458 /* pin down all the corrupted blocks too */
5459 cache = search_cache_extent(root->fs_info->corrupt_blocks, 0);
5461 btrfs_pin_extent(root->fs_info,
5462 cache->start, cache->size);
5463 cache = next_cache_extent(cache);
5465 prune_corrupt_blocks(trans, root->fs_info);
5466 reset_cached_block_groups(root->fs_info);
5470 * We need to delete any duplicate entries we find first otherwise we
5471 * could mess up the extent tree when we have backrefs that actually
5472 * belong to a different extent item and not the weird duplicate one.
5474 while (repair && !list_empty(&duplicate_extents)) {
5475 rec = list_entry(duplicate_extents.next, struct extent_record,
5477 list_del_init(&rec->list);
5479 /* Sometimes we can find a backref before we find an actual
5480 * extent, so we need to process it a little bit to see if there
5481 * truly are multiple EXTENT_ITEM_KEY's for the same range, or
5482 * if this is a backref screwup. If we need to delete stuff
5483 * process_duplicates() will return 0, otherwise it will return
5486 if (process_duplicates(root, extent_cache, rec))
5488 ret = delete_duplicate_records(trans, root, rec);
5492 * delete_duplicate_records will return the number of entries
5493 * deleted, so if it's greater than 0 then we know we actually
5494 * did something and we need to remove.
5505 cache = search_cache_extent(extent_cache, 0);
5508 rec = container_of(cache, struct extent_record, cache);
5509 if (rec->num_duplicates) {
5510 fprintf(stderr, "extent item %llu has multiple extent "
5511 "items\n", (unsigned long long)rec->start);
5515 if (rec->refs != rec->extent_item_refs) {
5516 fprintf(stderr, "ref mismatch on [%llu %llu] ",
5517 (unsigned long long)rec->start,
5518 (unsigned long long)rec->nr);
5519 fprintf(stderr, "extent item %llu, found %llu\n",
5520 (unsigned long long)rec->extent_item_refs,
5521 (unsigned long long)rec->refs);
5522 if (!fixed && repair) {
5523 ret = fixup_extent_refs(trans, root->fs_info,
5532 if (all_backpointers_checked(rec, 1)) {
5533 fprintf(stderr, "backpointer mismatch on [%llu %llu]\n",
5534 (unsigned long long)rec->start,
5535 (unsigned long long)rec->nr);
5537 if (!fixed && repair) {
5538 ret = fixup_extent_refs(trans, root->fs_info,
5547 if (!rec->owner_ref_checked) {
5548 fprintf(stderr, "owner ref check failed [%llu %llu]\n",
5549 (unsigned long long)rec->start,
5550 (unsigned long long)rec->nr);
5551 if (!fixed && repair) {
5552 ret = fixup_extent_refs(trans, root->fs_info,
5561 remove_cache_extent(extent_cache, cache);
5562 free_all_extent_backrefs(rec);
5567 if (ret && ret != -EAGAIN) {
5568 fprintf(stderr, "failed to repair damaged filesystem, aborting\n");
5571 btrfs_fix_block_accounting(trans, root);
5574 fprintf(stderr, "repaired damaged extent references\n");
5580 u64 calc_stripe_length(u64 type, u64 length, int num_stripes)
5584 if (type & BTRFS_BLOCK_GROUP_RAID0) {
5585 stripe_size = length;
5586 stripe_size /= num_stripes;
5587 } else if (type & BTRFS_BLOCK_GROUP_RAID10) {
5588 stripe_size = length * 2;
5589 stripe_size /= num_stripes;
5590 } else if (type & BTRFS_BLOCK_GROUP_RAID5) {
5591 stripe_size = length;
5592 stripe_size /= (num_stripes - 1);
5593 } else if (type & BTRFS_BLOCK_GROUP_RAID6) {
5594 stripe_size = length;
5595 stripe_size /= (num_stripes - 2);
5597 stripe_size = length;
5602 static int check_chunk_refs(struct chunk_record *chunk_rec,
5603 struct block_group_tree *block_group_cache,
5604 struct device_extent_tree *dev_extent_cache,
5607 struct cache_extent *block_group_item;
5608 struct block_group_record *block_group_rec;
5609 struct cache_extent *dev_extent_item;
5610 struct device_extent_record *dev_extent_rec;
5617 block_group_item = lookup_cache_extent(&block_group_cache->tree,
5620 if (block_group_item) {
5621 block_group_rec = container_of(block_group_item,
5622 struct block_group_record,
5624 if (chunk_rec->length != block_group_rec->offset ||
5625 chunk_rec->offset != block_group_rec->objectid ||
5626 chunk_rec->type_flags != block_group_rec->flags) {
5629 "Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) mismatch with block group[%llu, %u, %llu]: offset(%llu), objectid(%llu), flags(%llu)\n",
5630 chunk_rec->objectid,
5635 chunk_rec->type_flags,
5636 block_group_rec->objectid,
5637 block_group_rec->type,
5638 block_group_rec->offset,
5639 block_group_rec->offset,
5640 block_group_rec->objectid,
5641 block_group_rec->flags);
5644 list_del_init(&block_group_rec->list);
5645 chunk_rec->bg_rec = block_group_rec;
5650 "Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) is not found in block group\n",
5651 chunk_rec->objectid,
5656 chunk_rec->type_flags);
5660 length = calc_stripe_length(chunk_rec->type_flags, chunk_rec->length,
5661 chunk_rec->num_stripes);
5662 for (i = 0; i < chunk_rec->num_stripes; ++i) {
5663 devid = chunk_rec->stripes[i].devid;
5664 offset = chunk_rec->stripes[i].offset;
5665 dev_extent_item = lookup_cache_extent2(&dev_extent_cache->tree,
5666 devid, offset, length);
5667 if (dev_extent_item) {
5668 dev_extent_rec = container_of(dev_extent_item,
5669 struct device_extent_record,
5671 if (dev_extent_rec->objectid != devid ||
5672 dev_extent_rec->offset != offset ||
5673 dev_extent_rec->chunk_offset != chunk_rec->offset ||
5674 dev_extent_rec->length != length) {
5677 "Chunk[%llu, %u, %llu] stripe[%llu, %llu] dismatch dev extent[%llu, %llu, %llu]\n",
5678 chunk_rec->objectid,
5681 chunk_rec->stripes[i].devid,
5682 chunk_rec->stripes[i].offset,
5683 dev_extent_rec->objectid,
5684 dev_extent_rec->offset,
5685 dev_extent_rec->length);
5688 list_move(&dev_extent_rec->chunk_list,
5689 &chunk_rec->dextents);
5694 "Chunk[%llu, %u, %llu] stripe[%llu, %llu] is not found in dev extent\n",
5695 chunk_rec->objectid,
5698 chunk_rec->stripes[i].devid,
5699 chunk_rec->stripes[i].offset);
5706 /* check btrfs_chunk -> btrfs_dev_extent / btrfs_block_group_item */
5707 int check_chunks(struct cache_tree *chunk_cache,
5708 struct block_group_tree *block_group_cache,
5709 struct device_extent_tree *dev_extent_cache,
5710 struct list_head *good, struct list_head *bad, int silent)
5712 struct cache_extent *chunk_item;
5713 struct chunk_record *chunk_rec;
5714 struct block_group_record *bg_rec;
5715 struct device_extent_record *dext_rec;
5719 chunk_item = first_cache_extent(chunk_cache);
5720 while (chunk_item) {
5721 chunk_rec = container_of(chunk_item, struct chunk_record,
5723 err = check_chunk_refs(chunk_rec, block_group_cache,
5724 dev_extent_cache, silent);
5728 list_add_tail(&chunk_rec->list, bad);
5731 list_add_tail(&chunk_rec->list, good);
5734 chunk_item = next_cache_extent(chunk_item);
5737 list_for_each_entry(bg_rec, &block_group_cache->block_groups, list) {
5740 "Block group[%llu, %llu] (flags = %llu) didn't find the relative chunk.\n",
5748 list_for_each_entry(dext_rec, &dev_extent_cache->no_chunk_orphans,
5752 "Device extent[%llu, %llu, %llu] didn't find the relative chunk.\n",
5763 static int check_device_used(struct device_record *dev_rec,
5764 struct device_extent_tree *dext_cache)
5766 struct cache_extent *cache;
5767 struct device_extent_record *dev_extent_rec;
5770 cache = search_cache_extent2(&dext_cache->tree, dev_rec->devid, 0);
5772 dev_extent_rec = container_of(cache,
5773 struct device_extent_record,
5775 if (dev_extent_rec->objectid != dev_rec->devid)
5778 list_del(&dev_extent_rec->device_list);
5779 total_byte += dev_extent_rec->length;
5780 cache = next_cache_extent(cache);
5783 if (total_byte != dev_rec->byte_used) {
5785 "Dev extent's total-byte(%llu) is not equal to byte-used(%llu) in dev[%llu, %u, %llu]\n",
5786 total_byte, dev_rec->byte_used, dev_rec->objectid,
5787 dev_rec->type, dev_rec->offset);
5794 /* check btrfs_dev_item -> btrfs_dev_extent */
5795 static int check_devices(struct rb_root *dev_cache,
5796 struct device_extent_tree *dev_extent_cache)
5798 struct rb_node *dev_node;
5799 struct device_record *dev_rec;
5800 struct device_extent_record *dext_rec;
5804 dev_node = rb_first(dev_cache);
5806 dev_rec = container_of(dev_node, struct device_record, node);
5807 err = check_device_used(dev_rec, dev_extent_cache);
5811 dev_node = rb_next(dev_node);
5813 list_for_each_entry(dext_rec, &dev_extent_cache->no_device_orphans,
5816 "Device extent[%llu, %llu, %llu] didn't find its device.\n",
5817 dext_rec->objectid, dext_rec->offset, dext_rec->length);
5824 static int check_chunks_and_extents(struct btrfs_root *root)
5826 struct rb_root dev_cache;
5827 struct cache_tree chunk_cache;
5828 struct block_group_tree block_group_cache;
5829 struct device_extent_tree dev_extent_cache;
5830 struct cache_tree extent_cache;
5831 struct cache_tree seen;
5832 struct cache_tree pending;
5833 struct cache_tree reada;
5834 struct cache_tree nodes;
5835 struct cache_tree corrupt_blocks;
5836 struct btrfs_path path;
5837 struct btrfs_key key;
5838 struct btrfs_key found_key;
5841 struct block_info *bits;
5843 struct extent_buffer *leaf;
5844 struct btrfs_trans_handle *trans = NULL;
5846 struct btrfs_root_item ri;
5847 struct list_head dropping_trees;
5849 dev_cache = RB_ROOT;
5850 cache_tree_init(&chunk_cache);
5851 block_group_tree_init(&block_group_cache);
5852 device_extent_tree_init(&dev_extent_cache);
5854 cache_tree_init(&extent_cache);
5855 cache_tree_init(&seen);
5856 cache_tree_init(&pending);
5857 cache_tree_init(&nodes);
5858 cache_tree_init(&reada);
5859 cache_tree_init(&corrupt_blocks);
5860 INIT_LIST_HEAD(&dropping_trees);
5863 trans = btrfs_start_transaction(root, 1);
5864 if (IS_ERR(trans)) {
5865 fprintf(stderr, "Error starting transaction\n");
5866 return PTR_ERR(trans);
5868 root->fs_info->fsck_extent_cache = &extent_cache;
5869 root->fs_info->free_extent_hook = free_extent_hook;
5870 root->fs_info->corrupt_blocks = &corrupt_blocks;
5874 bits = malloc(bits_nr * sizeof(struct block_info));
5881 add_root_to_pending(root->fs_info->tree_root->node,
5882 &extent_cache, &pending, &seen, &nodes,
5883 &root->fs_info->tree_root->root_key);
5885 add_root_to_pending(root->fs_info->chunk_root->node,
5886 &extent_cache, &pending, &seen, &nodes,
5887 &root->fs_info->chunk_root->root_key);
5889 btrfs_init_path(&path);
5892 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
5893 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
5897 leaf = path.nodes[0];
5898 slot = path.slots[0];
5899 if (slot >= btrfs_header_nritems(path.nodes[0])) {
5900 ret = btrfs_next_leaf(root, &path);
5903 leaf = path.nodes[0];
5904 slot = path.slots[0];
5906 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
5907 if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
5908 unsigned long offset;
5909 struct extent_buffer *buf;
5911 offset = btrfs_item_ptr_offset(leaf, path.slots[0]);
5912 read_extent_buffer(leaf, &ri, offset, sizeof(ri));
5913 if (btrfs_disk_key_objectid(&ri.drop_progress) == 0) {
5914 buf = read_tree_block(root->fs_info->tree_root,
5915 btrfs_root_bytenr(&ri),
5916 btrfs_level_size(root,
5917 btrfs_root_level(&ri)),
5923 add_root_to_pending(buf, &extent_cache,
5924 &pending, &seen, &nodes,
5926 free_extent_buffer(buf);
5928 struct dropping_root_item_record *dri_rec;
5929 dri_rec = malloc(sizeof(*dri_rec));
5934 memcpy(&dri_rec->ri, &ri, sizeof(ri));
5935 memcpy(&dri_rec->found_key, &found_key,
5937 list_add_tail(&dri_rec->list, &dropping_trees);
5942 btrfs_release_path(&path);
5944 ret = run_next_block(trans, root, bits, bits_nr, &last,
5945 &pending, &seen, &reada, &nodes,
5946 &extent_cache, &chunk_cache, &dev_cache,
5947 &block_group_cache, &dev_extent_cache,
5953 while (!list_empty(&dropping_trees)) {
5954 struct dropping_root_item_record *rec;
5955 struct extent_buffer *buf;
5956 rec = list_entry(dropping_trees.next,
5957 struct dropping_root_item_record, list);
5963 buf = read_tree_block(root->fs_info->tree_root,
5964 btrfs_root_bytenr(&rec->ri),
5965 btrfs_level_size(root,
5966 btrfs_root_level(&rec->ri)), 0);
5971 add_root_to_pending(buf, &extent_cache, &pending,
5972 &seen, &nodes, &rec->found_key);
5974 ret = run_next_block(trans, root, bits, bits_nr, &last,
5975 &pending, &seen, &reada,
5976 &nodes, &extent_cache,
5977 &chunk_cache, &dev_cache,
5984 free_extent_buffer(buf);
5985 list_del(&rec->list);
5990 ret = check_extent_refs(trans, root, &extent_cache);
5991 if (ret == -EAGAIN) {
5992 ret = btrfs_commit_transaction(trans, root);
5996 trans = btrfs_start_transaction(root, 1);
5997 if (IS_ERR(trans)) {
5998 ret = PTR_ERR(trans);
6002 free_corrupt_blocks_tree(root->fs_info->corrupt_blocks);
6003 free_extent_cache_tree(&seen);
6004 free_extent_cache_tree(&pending);
6005 free_extent_cache_tree(&reada);
6006 free_extent_cache_tree(&nodes);
6007 free_extent_record_cache(root->fs_info, &extent_cache);
6011 err = check_chunks(&chunk_cache, &block_group_cache,
6012 &dev_extent_cache, NULL, NULL, 0);
6016 err = check_devices(&dev_cache, &dev_extent_cache);
6021 err = btrfs_commit_transaction(trans, root);
6027 free_corrupt_blocks_tree(root->fs_info->corrupt_blocks);
6028 root->fs_info->fsck_extent_cache = NULL;
6029 root->fs_info->free_extent_hook = NULL;
6030 root->fs_info->corrupt_blocks = NULL;
6033 free_chunk_cache_tree(&chunk_cache);
6034 free_device_cache_tree(&dev_cache);
6035 free_block_group_tree(&block_group_cache);
6036 free_device_extent_tree(&dev_extent_cache);
6037 free_extent_cache_tree(&seen);
6038 free_extent_cache_tree(&pending);
6039 free_extent_cache_tree(&reada);
6040 free_extent_cache_tree(&nodes);
6044 static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
6045 struct btrfs_root *root, int overwrite)
6047 struct extent_buffer *c;
6048 struct extent_buffer *old = root->node;
6051 struct btrfs_disk_key disk_key = {0,0,0};
6057 extent_buffer_get(c);
6060 c = btrfs_alloc_free_block(trans, root,
6061 btrfs_level_size(root, 0),
6062 root->root_key.objectid,
6063 &disk_key, level, 0, 0);
6066 extent_buffer_get(c);
6070 memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header));
6071 btrfs_set_header_level(c, level);
6072 btrfs_set_header_bytenr(c, c->start);
6073 btrfs_set_header_generation(c, trans->transid);
6074 btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV);
6075 btrfs_set_header_owner(c, root->root_key.objectid);
6077 write_extent_buffer(c, root->fs_info->fsid,
6078 btrfs_header_fsid(), BTRFS_FSID_SIZE);
6080 write_extent_buffer(c, root->fs_info->chunk_tree_uuid,
6081 btrfs_header_chunk_tree_uuid(c),
6084 btrfs_mark_buffer_dirty(c);
6086 * this case can happen in the following case:
6088 * 1.overwrite previous root.
6090 * 2.reinit reloc data root, this is because we skip pin
6091 * down reloc data tree before which means we can allocate
6092 * same block bytenr here.
6094 if (old->start == c->start) {
6095 btrfs_set_root_generation(&root->root_item,
6097 root->root_item.level = btrfs_header_level(root->node);
6098 ret = btrfs_update_root(trans, root->fs_info->tree_root,
6099 &root->root_key, &root->root_item);
6101 free_extent_buffer(c);
6105 free_extent_buffer(old);
6107 add_root_to_dirty_list(root);
6111 static int pin_down_tree_blocks(struct btrfs_fs_info *fs_info,
6112 struct extent_buffer *eb, int tree_root)
6114 struct extent_buffer *tmp;
6115 struct btrfs_root_item *ri;
6116 struct btrfs_key key;
6119 int level = btrfs_header_level(eb);
6124 btrfs_pin_extent(fs_info, eb->start, eb->len);
6126 leafsize = btrfs_super_leafsize(fs_info->super_copy);
6127 nritems = btrfs_header_nritems(eb);
6128 for (i = 0; i < nritems; i++) {
6130 btrfs_item_key_to_cpu(eb, &key, i);
6131 if (key.type != BTRFS_ROOT_ITEM_KEY)
6133 /* Skip the extent root and reloc roots */
6134 if (key.objectid == BTRFS_EXTENT_TREE_OBJECTID ||
6135 key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
6136 key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
6138 ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
6139 bytenr = btrfs_disk_root_bytenr(eb, ri);
6142 * If at any point we start needing the real root we
6143 * will have to build a stump root for the root we are
6144 * in, but for now this doesn't actually use the root so
6145 * just pass in extent_root.
6147 tmp = read_tree_block(fs_info->extent_root, bytenr,
6150 fprintf(stderr, "Error reading root block\n");
6153 ret = pin_down_tree_blocks(fs_info, tmp, 0);
6154 free_extent_buffer(tmp);
6158 bytenr = btrfs_node_blockptr(eb, i);
6160 /* If we aren't the tree root don't read the block */
6161 if (level == 1 && !tree_root) {
6162 btrfs_pin_extent(fs_info, bytenr, leafsize);
6166 tmp = read_tree_block(fs_info->extent_root, bytenr,
6169 fprintf(stderr, "Error reading tree block\n");
6172 ret = pin_down_tree_blocks(fs_info, tmp, tree_root);
6173 free_extent_buffer(tmp);
6182 static int pin_metadata_blocks(struct btrfs_fs_info *fs_info)
6186 ret = pin_down_tree_blocks(fs_info, fs_info->chunk_root->node, 0);
6190 return pin_down_tree_blocks(fs_info, fs_info->tree_root->node, 1);
6193 static int reset_block_groups(struct btrfs_fs_info *fs_info)
6195 struct btrfs_block_group_cache *cache;
6196 struct btrfs_path *path;
6197 struct extent_buffer *leaf;
6198 struct btrfs_chunk *chunk;
6199 struct btrfs_key key;
6203 path = btrfs_alloc_path();
6208 key.type = BTRFS_CHUNK_ITEM_KEY;
6211 ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0);
6213 btrfs_free_path(path);
6218 * We do this in case the block groups were screwed up and had alloc
6219 * bits that aren't actually set on the chunks. This happens with
6220 * restored images every time and could happen in real life I guess.
6222 fs_info->avail_data_alloc_bits = 0;
6223 fs_info->avail_metadata_alloc_bits = 0;
6224 fs_info->avail_system_alloc_bits = 0;
6226 /* First we need to create the in-memory block groups */
6228 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
6229 ret = btrfs_next_leaf(fs_info->chunk_root, path);
6231 btrfs_free_path(path);
6239 leaf = path->nodes[0];
6240 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
6241 if (key.type != BTRFS_CHUNK_ITEM_KEY) {
6246 chunk = btrfs_item_ptr(leaf, path->slots[0],
6247 struct btrfs_chunk);
6248 btrfs_add_block_group(fs_info, 0,
6249 btrfs_chunk_type(leaf, chunk),
6250 key.objectid, key.offset,
6251 btrfs_chunk_length(leaf, chunk));
6252 set_extent_dirty(&fs_info->free_space_cache, key.offset,
6253 key.offset + btrfs_chunk_length(leaf, chunk),
6259 cache = btrfs_lookup_first_block_group(fs_info, start);
6263 start = cache->key.objectid + cache->key.offset;
6266 btrfs_free_path(path);
6270 static int reset_balance(struct btrfs_trans_handle *trans,
6271 struct btrfs_fs_info *fs_info)
6273 struct btrfs_root *root = fs_info->tree_root;
6274 struct btrfs_path *path;
6275 struct extent_buffer *leaf;
6276 struct btrfs_key key;
6277 int del_slot, del_nr = 0;
6281 path = btrfs_alloc_path();
6285 key.objectid = BTRFS_BALANCE_OBJECTID;
6286 key.type = BTRFS_BALANCE_ITEM_KEY;
6289 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
6294 goto reinit_data_reloc;
6299 ret = btrfs_del_item(trans, root, path);
6302 btrfs_release_path(path);
6304 key.objectid = BTRFS_TREE_RELOC_OBJECTID;
6305 key.type = BTRFS_ROOT_ITEM_KEY;
6308 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
6312 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
6317 ret = btrfs_del_items(trans, root, path,
6324 btrfs_release_path(path);
6327 ret = btrfs_search_slot(trans, root, &key, path,
6334 leaf = path->nodes[0];
6335 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
6336 if (key.objectid > BTRFS_TREE_RELOC_OBJECTID)
6338 if (key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
6343 del_slot = path->slots[0];
6352 ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
6356 btrfs_release_path(path);
6359 key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
6360 key.type = BTRFS_ROOT_ITEM_KEY;
6361 key.offset = (u64)-1;
6362 root = btrfs_read_fs_root(fs_info, &key);
6364 fprintf(stderr, "Error reading data reloc tree\n");
6365 return PTR_ERR(root);
6367 record_root_in_trans(trans, root);
6368 ret = btrfs_fsck_reinit_root(trans, root, 0);
6371 ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
6373 btrfs_free_path(path);
6377 static int reinit_extent_tree(struct btrfs_trans_handle *trans,
6378 struct btrfs_fs_info *fs_info)
6384 * The only reason we don't do this is because right now we're just
6385 * walking the trees we find and pinning down their bytes, we don't look
6386 * at any of the leaves. In order to do mixed groups we'd have to check
6387 * the leaves of any fs roots and pin down the bytes for any file
6388 * extents we find. Not hard but why do it if we don't have to?
6390 if (btrfs_fs_incompat(fs_info, BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)) {
6391 fprintf(stderr, "We don't support re-initing the extent tree "
6392 "for mixed block groups yet, please notify a btrfs "
6393 "developer you want to do this so they can add this "
6394 "functionality.\n");
6399 * first we need to walk all of the trees except the extent tree and pin
6400 * down the bytes that are in use so we don't overwrite any existing
6403 ret = pin_metadata_blocks(fs_info);
6405 fprintf(stderr, "error pinning down used bytes\n");
6410 * Need to drop all the block groups since we're going to recreate all
6413 btrfs_free_block_groups(fs_info);
6414 ret = reset_block_groups(fs_info);
6416 fprintf(stderr, "error resetting the block groups\n");
6420 /* Ok we can allocate now, reinit the extent root */
6421 ret = btrfs_fsck_reinit_root(trans, fs_info->extent_root, 0);
6423 fprintf(stderr, "extent root initialization failed\n");
6425 * When the transaction code is updated we should end the
6426 * transaction, but for now progs only knows about commit so
6427 * just return an error.
6433 * Now we have all the in-memory block groups setup so we can make
6434 * allocations properly, and the metadata we care about is safe since we
6435 * pinned all of it above.
6438 struct btrfs_block_group_cache *cache;
6440 cache = btrfs_lookup_first_block_group(fs_info, start);
6443 start = cache->key.objectid + cache->key.offset;
6444 ret = btrfs_insert_item(trans, fs_info->extent_root,
6445 &cache->key, &cache->item,
6446 sizeof(cache->item));
6448 fprintf(stderr, "Error adding block group\n");
6451 btrfs_extent_post_op(trans, fs_info->extent_root);
6454 ret = reset_balance(trans, fs_info);
6456 fprintf(stderr, "error reseting the pending balance\n");
6461 static int recow_extent_buffer(struct btrfs_root *root, struct extent_buffer *eb)
6463 struct btrfs_path *path;
6464 struct btrfs_trans_handle *trans;
6465 struct btrfs_key key;
6468 printf("Recowing metadata block %llu\n", eb->start);
6469 key.objectid = btrfs_header_owner(eb);
6470 key.type = BTRFS_ROOT_ITEM_KEY;
6471 key.offset = (u64)-1;
6473 root = btrfs_read_fs_root(root->fs_info, &key);
6475 fprintf(stderr, "Couldn't find owner root %llu\n",
6477 return PTR_ERR(root);
6480 path = btrfs_alloc_path();
6484 trans = btrfs_start_transaction(root, 1);
6485 if (IS_ERR(trans)) {
6486 btrfs_free_path(path);
6487 return PTR_ERR(trans);
6490 path->lowest_level = btrfs_header_level(eb);
6491 if (path->lowest_level)
6492 btrfs_node_key_to_cpu(eb, &key, 0);
6494 btrfs_item_key_to_cpu(eb, &key, 0);
6496 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
6497 btrfs_commit_transaction(trans, root);
6498 btrfs_free_path(path);
6502 static int delete_bad_item(struct btrfs_root *root, struct bad_item *bad)
6504 struct btrfs_path *path;
6505 struct btrfs_trans_handle *trans;
6506 struct btrfs_key key;
6509 printf("Deleting bad item [%llu,%u,%llu]\n", bad->key.objectid,
6510 bad->key.type, bad->key.offset);
6511 key.objectid = bad->root_id;
6512 key.type = BTRFS_ROOT_ITEM_KEY;
6513 key.offset = (u64)-1;
6515 root = btrfs_read_fs_root(root->fs_info, &key);
6517 fprintf(stderr, "Couldn't find owner root %llu\n",
6519 return PTR_ERR(root);
6522 path = btrfs_alloc_path();
6526 trans = btrfs_start_transaction(root, 1);
6527 if (IS_ERR(trans)) {
6528 btrfs_free_path(path);
6529 return PTR_ERR(trans);
6532 ret = btrfs_search_slot(trans, root, &bad->key, path, -1, 1);
6538 ret = btrfs_del_item(trans, root, path);
6540 btrfs_commit_transaction(trans, root);
6541 btrfs_free_path(path);
6545 static struct option long_options[] = {
6546 { "super", 1, NULL, 's' },
6547 { "repair", 0, NULL, 0 },
6548 { "init-csum-tree", 0, NULL, 0 },
6549 { "init-extent-tree", 0, NULL, 0 },
6550 { "check-data-csum", 0, NULL, 0 },
6551 { "backup", 0, NULL, 0 },
6552 { "subvol-extents", no_argument, NULL, 'E' },
6553 { "qgroup-report", 0, NULL, 'Q' },
6557 const char * const cmd_check_usage[] = {
6558 "btrfs check [options] <device>",
6559 "Check an unmounted btrfs filesystem.",
6561 "-s|--super <superblock> use this superblock copy",
6562 "-b|--backup use the backup root copy",
6563 "--repair try to repair the filesystem",
6564 "--init-csum-tree create a new CRC tree",
6565 "--init-extent-tree create a new extent tree",
6566 "--check-data-csum verify checkums of data blocks",
6567 "--qgroup-report print a report on qgroup consistency",
6568 "--subvol-extents print subvolume extents and sharing state",
6572 int cmd_check(int argc, char **argv)
6574 struct cache_tree root_cache;
6575 struct btrfs_root *root;
6576 struct btrfs_fs_info *info;
6579 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
6582 int option_index = 0;
6583 int init_csum_tree = 0;
6584 int qgroup_report = 0;
6585 enum btrfs_open_ctree_flags ctree_flags =
6586 OPEN_CTREE_PARTIAL | OPEN_CTREE_EXCLUSIVE;
6590 c = getopt_long(argc, argv, "as:b", long_options,
6595 case 'a': /* ignored */ break;
6597 ctree_flags |= OPEN_CTREE_BACKUP_ROOT;
6600 num = arg_strtou64(optarg);
6601 if (num >= BTRFS_SUPER_MIRROR_MAX) {
6603 "ERROR: super mirror should be less than: %d\n",
6604 BTRFS_SUPER_MIRROR_MAX);
6607 bytenr = btrfs_sb_offset(((int)num));
6608 printf("using SB copy %llu, bytenr %llu\n", num,
6609 (unsigned long long)bytenr);
6615 subvolid = arg_strtou64(optarg);
6619 usage(cmd_check_usage);
6621 if (option_index == 1) {
6622 printf("enabling repair mode\n");
6624 ctree_flags |= OPEN_CTREE_WRITES;
6625 } else if (option_index == 2) {
6626 printf("Creating a new CRC tree\n");
6629 ctree_flags |= OPEN_CTREE_WRITES;
6630 } else if (option_index == 3) {
6631 init_extent_tree = 1;
6632 ctree_flags |= (OPEN_CTREE_WRITES |
6633 OPEN_CTREE_NO_BLOCK_GROUPS);
6635 } else if (option_index == 4) {
6636 check_data_csum = 1;
6639 argc = argc - optind;
6641 if (check_argc_exact(argc, 1))
6642 usage(cmd_check_usage);
6645 cache_tree_init(&root_cache);
6647 if((ret = check_mounted(argv[optind])) < 0) {
6648 fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret));
6651 fprintf(stderr, "%s is currently mounted. Aborting.\n", argv[optind]);
6656 info = open_ctree_fs_info(argv[optind], bytenr, 0, ctree_flags);
6658 fprintf(stderr, "Couldn't open file system\n");
6663 root = info->fs_root;
6664 uuid_unparse(info->super_copy->fsid, uuidbuf);
6665 if (qgroup_report) {
6666 printf("Print quota groups for %s\nUUID: %s\n", argv[optind],
6668 ret = qgroup_verify_all(info);
6670 print_qgroup_report(1);
6674 printf("Print extent state for subvolume %llu on %s\nUUID: %s\n",
6675 subvolid, argv[optind], uuidbuf);
6676 ret = print_extent_state(info, subvolid);
6679 printf("Checking filesystem on %s\nUUID: %s\n", argv[optind], uuidbuf);
6681 if (!extent_buffer_uptodate(info->tree_root->node) ||
6682 !extent_buffer_uptodate(info->dev_root->node) ||
6683 !extent_buffer_uptodate(info->chunk_root->node)) {
6684 fprintf(stderr, "Critical roots corrupted, unable to fsck the FS\n");
6689 if (init_extent_tree || init_csum_tree) {
6690 struct btrfs_trans_handle *trans;
6692 trans = btrfs_start_transaction(info->extent_root, 0);
6693 if (IS_ERR(trans)) {
6694 fprintf(stderr, "Error starting transaction\n");
6695 ret = PTR_ERR(trans);
6699 if (init_extent_tree) {
6700 printf("Creating a new extent tree\n");
6701 ret = reinit_extent_tree(trans, info);
6706 if (init_csum_tree) {
6707 fprintf(stderr, "Reinit crc root\n");
6708 ret = btrfs_fsck_reinit_root(trans, info->csum_root, 0);
6710 fprintf(stderr, "crc root initialization failed\n");
6716 * Ok now we commit and run the normal fsck, which will add
6717 * extent entries for all of the items it finds.
6719 ret = btrfs_commit_transaction(trans, info->extent_root);
6723 if (!extent_buffer_uptodate(info->extent_root->node)) {
6724 fprintf(stderr, "Critical roots corrupted, unable to fsck the FS\n");
6729 fprintf(stderr, "checking extents\n");
6730 ret = check_chunks_and_extents(root);
6732 fprintf(stderr, "Errors found in extent allocation tree or chunk allocation\n");
6734 fprintf(stderr, "checking free space cache\n");
6735 ret = check_space_cache(root);
6740 * We used to have to have these hole extents in between our real
6741 * extents so if we don't have this flag set we need to make sure there
6742 * are no gaps in the file extents for inodes, otherwise we can just
6743 * ignore it when this happens.
6745 no_holes = btrfs_fs_incompat(root->fs_info,
6746 BTRFS_FEATURE_INCOMPAT_NO_HOLES);
6747 fprintf(stderr, "checking fs roots\n");
6748 ret = check_fs_roots(root, &root_cache);
6752 fprintf(stderr, "checking csums\n");
6753 ret = check_csums(root);
6757 fprintf(stderr, "checking root refs\n");
6758 ret = check_root_refs(root, &root_cache);
6762 while (repair && !list_empty(&root->fs_info->recow_ebs)) {
6763 struct extent_buffer *eb;
6765 eb = list_first_entry(&root->fs_info->recow_ebs,
6766 struct extent_buffer, recow);
6767 ret = recow_extent_buffer(root, eb);
6772 while (!list_empty(&delete_items)) {
6773 struct bad_item *bad;
6775 bad = list_first_entry(&delete_items, struct bad_item, list);
6776 list_del_init(&bad->list);
6778 ret = delete_bad_item(root, bad);
6782 if (info->quota_enabled) {
6784 fprintf(stderr, "checking quota groups\n");
6785 err = qgroup_verify_all(info);
6790 if (!list_empty(&root->fs_info->recow_ebs)) {
6791 fprintf(stderr, "Transid errors in file system\n");
6795 print_qgroup_report(0);
6796 if (found_old_backref) { /*
6797 * there was a disk format change when mixed
6798 * backref was in testing tree. The old format
6799 * existed about one week.
6801 printf("\n * Found old mixed backref format. "
6802 "The old format is not supported! *"
6803 "\n * Please mount the FS in readonly mode, "
6804 "backup data and re-format the FS. *\n\n");
6807 printf("found %llu bytes used err is %d\n",
6808 (unsigned long long)bytes_used, ret);
6809 printf("total csum bytes: %llu\n",(unsigned long long)total_csum_bytes);
6810 printf("total tree bytes: %llu\n",
6811 (unsigned long long)total_btree_bytes);
6812 printf("total fs tree bytes: %llu\n",
6813 (unsigned long long)total_fs_tree_bytes);
6814 printf("total extent tree bytes: %llu\n",
6815 (unsigned long long)total_extent_tree_bytes);
6816 printf("btree space waste bytes: %llu\n",
6817 (unsigned long long)btree_space_waste);
6818 printf("file data blocks allocated: %llu\n referenced %llu\n",
6819 (unsigned long long)data_bytes_allocated,
6820 (unsigned long long)data_bytes_referenced);
6821 printf("%s\n", BTRFS_BUILD_VERSION);
6823 free_root_recs_tree(&root_cache);