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.
21 #include <sys/types.h>
25 #include <uuid/uuid.h>
26 #include "kerncompat.h"
27 #include "radix-tree.h"
31 #include "transaction.h"
34 #include "print-tree.h"
35 #include "rbtree-utils.h"
37 /* specified errno for check_tree_block */
38 #define BTRFS_BAD_BYTENR (-1)
39 #define BTRFS_BAD_FSID (-2)
40 #define BTRFS_BAD_LEVEL (-3)
41 #define BTRFS_BAD_NRITEMS (-4)
43 /* Calculate max possible nritems for a leaf/node */
44 static u32 max_nritems(u8 level, u32 nodesize)
48 return ((nodesize - sizeof(struct btrfs_header)) /
49 sizeof(struct btrfs_item));
50 return ((nodesize - sizeof(struct btrfs_header)) /
51 sizeof(struct btrfs_key_ptr));
54 static int check_tree_block(struct btrfs_fs_info *fs_info,
55 struct extent_buffer *buf)
58 struct btrfs_fs_devices *fs_devices;
59 u32 nodesize = fs_info->nodesize;
60 int ret = BTRFS_BAD_FSID;
62 if (buf->start != btrfs_header_bytenr(buf))
63 return BTRFS_BAD_BYTENR;
64 if (btrfs_header_level(buf) >= BTRFS_MAX_LEVEL)
65 return BTRFS_BAD_LEVEL;
66 if (btrfs_header_nritems(buf) > max_nritems(btrfs_header_level(buf),
68 return BTRFS_BAD_NRITEMS;
70 /* Only leaf can be empty */
71 if (btrfs_header_nritems(buf) == 0 &&
72 btrfs_header_level(buf) != 0)
73 return BTRFS_BAD_NRITEMS;
75 fs_devices = fs_info->fs_devices;
77 if (fs_info->ignore_fsid_mismatch ||
78 !memcmp_extent_buffer(buf, fs_devices->fsid,
84 fs_devices = fs_devices->seed;
89 static void print_tree_block_error(struct btrfs_fs_info *fs_info,
90 struct extent_buffer *eb,
93 char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
94 char found_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
95 u8 buf[BTRFS_UUID_SIZE];
99 read_extent_buffer(eb, buf, btrfs_header_fsid(),
101 uuid_unparse(buf, found_uuid);
102 uuid_unparse(fs_info->fsid, fs_uuid);
103 fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
104 fs_uuid, found_uuid);
106 case BTRFS_BAD_BYTENR:
107 fprintf(stderr, "bytenr mismatch, want=%llu, have=%llu\n",
108 eb->start, btrfs_header_bytenr(eb));
110 case BTRFS_BAD_LEVEL:
111 fprintf(stderr, "bad level, %u > %u\n",
112 btrfs_header_level(eb), BTRFS_MAX_LEVEL);
114 case BTRFS_BAD_NRITEMS:
115 fprintf(stderr, "invalid nr_items: %u\n",
116 btrfs_header_nritems(eb));
121 u32 btrfs_csum_data(char *data, u32 seed, size_t len)
123 return crc32c(seed, data, len);
126 void btrfs_csum_final(u32 crc, u8 *result)
128 put_unaligned_le32(~crc, result);
131 static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
132 int verify, int silent)
134 u8 result[BTRFS_CSUM_SIZE];
138 len = buf->len - BTRFS_CSUM_SIZE;
139 crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
140 btrfs_csum_final(crc, result);
143 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
145 printk("checksum verify failed on %llu found %08X wanted %08X\n",
146 (unsigned long long)buf->start,
148 *((u32*)(char *)buf->data));
152 write_extent_buffer(buf, result, 0, csum_size);
157 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
159 return __csum_tree_block_size(buf, csum_size, verify, 0);
162 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
164 return __csum_tree_block_size(buf, csum_size, 1, 1);
167 static int csum_tree_block_fs_info(struct btrfs_fs_info *fs_info,
168 struct extent_buffer *buf, int verify)
171 btrfs_super_csum_size(fs_info->super_copy);
172 if (verify && fs_info->suppress_check_block_errors)
173 return verify_tree_block_csum_silent(buf, csum_size);
174 return csum_tree_block_size(buf, csum_size, verify);
177 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
180 return csum_tree_block_fs_info(root->fs_info, buf, verify);
183 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
184 u64 bytenr, u32 blocksize)
186 return find_extent_buffer(&root->fs_info->extent_cache,
190 struct extent_buffer* btrfs_find_create_tree_block(
191 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize)
193 return alloc_extent_buffer(&fs_info->extent_cache, bytenr, blocksize);
196 void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
199 struct extent_buffer *eb;
201 struct btrfs_multi_bio *multi = NULL;
202 struct btrfs_device *device;
204 eb = btrfs_find_tree_block(root, bytenr, blocksize);
205 if (!(eb && btrfs_buffer_uptodate(eb, parent_transid)) &&
206 !btrfs_map_block(root->fs_info, READ, bytenr, &length, &multi, 0,
208 device = multi->stripes[0].dev;
210 blocksize = min(blocksize, (u32)SZ_64K);
211 readahead(device->fd, multi->stripes[0].physical, blocksize);
214 free_extent_buffer(eb);
218 static int verify_parent_transid(struct extent_io_tree *io_tree,
219 struct extent_buffer *eb, u64 parent_transid,
224 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
227 if (extent_buffer_uptodate(eb) &&
228 btrfs_header_generation(eb) == parent_transid) {
232 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
233 (unsigned long long)eb->start,
234 (unsigned long long)parent_transid,
235 (unsigned long long)btrfs_header_generation(eb));
237 eb->flags |= EXTENT_BAD_TRANSID;
238 printk("Ignoring transid failure\n");
244 clear_extent_buffer_uptodate(eb);
250 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
252 unsigned long offset = 0;
253 struct btrfs_multi_bio *multi = NULL;
254 struct btrfs_device *device;
257 unsigned long bytes_left = eb->len;
260 read_len = bytes_left;
263 if (!info->on_restoring &&
264 eb->start != BTRFS_SUPER_INFO_OFFSET) {
265 ret = btrfs_map_block(info, READ, eb->start + offset,
266 &read_len, &multi, mirror, NULL);
268 printk("Couldn't map the block %Lu\n", eb->start + offset);
272 device = multi->stripes[0].dev;
274 if (device->fd <= 0) {
281 eb->dev_bytenr = multi->stripes[0].physical;
285 /* special case for restore metadump */
286 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
287 if (device->devid == 1)
292 eb->dev_bytenr = eb->start;
296 if (read_len > bytes_left)
297 read_len = bytes_left;
299 ret = read_extent_from_disk(eb, offset, read_len);
303 bytes_left -= read_len;
308 struct extent_buffer* read_tree_block(
309 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
313 struct extent_buffer *eb;
314 u64 best_transid = 0;
315 u32 sectorsize = fs_info->sectorsize;
316 u32 nodesize = fs_info->nodesize;
323 * Don't even try to create tree block for unaligned tree block
325 * Such unaligned tree block will free overlapping extent buffer,
326 * causing use-after-free bugs for fuzzed images.
328 if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
329 error("tree block bytenr %llu is not aligned to sectorsize %u",
331 return ERR_PTR(-EIO);
333 if (blocksize < nodesize || !IS_ALIGNED(blocksize, nodesize)) {
334 error("tree block size %u is not aligned to nodesize %u",
335 blocksize, nodesize);
336 return ERR_PTR(-EIO);
339 eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
341 return ERR_PTR(-ENOMEM);
343 if (btrfs_buffer_uptodate(eb, parent_transid))
347 ret = read_whole_eb(fs_info, eb, mirror_num);
348 if (ret == 0 && csum_tree_block_fs_info(fs_info, eb, 1) == 0 &&
349 check_tree_block(fs_info, eb) == 0 &&
350 verify_parent_transid(eb->tree, eb, parent_transid, ignore)
352 if (eb->flags & EXTENT_BAD_TRANSID &&
353 list_empty(&eb->recow)) {
354 list_add_tail(&eb->recow,
355 &fs_info->recow_ebs);
358 btrfs_set_buffer_uptodate(eb);
362 if (check_tree_block(fs_info, eb)) {
363 if (!fs_info->suppress_check_block_errors)
364 print_tree_block_error(fs_info, eb,
365 check_tree_block(fs_info, eb));
367 if (!fs_info->suppress_check_block_errors)
368 fprintf(stderr, "Csum didn't match\n");
373 num_copies = btrfs_num_copies(&fs_info->mapping_tree,
375 if (num_copies == 1) {
379 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
380 best_transid = btrfs_header_generation(eb);
381 good_mirror = mirror_num;
384 if (mirror_num > num_copies) {
385 mirror_num = good_mirror;
390 free_extent_buffer(eb);
394 int read_extent_data(struct btrfs_root *root, char *data,
395 u64 logical, u64 *len, int mirror)
398 struct btrfs_multi_bio *multi = NULL;
399 struct btrfs_fs_info *info = root->fs_info;
400 struct btrfs_device *device;
404 ret = btrfs_map_block(info, READ, logical, len, &multi, mirror, NULL);
406 fprintf(stderr, "Couldn't map the block %llu\n",
410 device = multi->stripes[0].dev;
417 ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
427 int write_and_map_eb(struct btrfs_root *root, struct extent_buffer *eb)
432 u64 *raid_map = NULL;
433 struct btrfs_multi_bio *multi = NULL;
437 ret = btrfs_map_block(root->fs_info, WRITE, eb->start, &length,
438 &multi, 0, &raid_map);
441 ret = write_raid56_with_parity(root->fs_info, eb, multi,
444 } else while (dev_nr < multi->num_stripes) {
446 eb->fd = multi->stripes[dev_nr].dev->fd;
447 eb->dev_bytenr = multi->stripes[dev_nr].physical;
448 multi->stripes[dev_nr].dev->total_ios++;
450 ret = write_extent_to_disk(eb);
458 int write_tree_block(struct btrfs_trans_handle *trans,
459 struct btrfs_root *root,
460 struct extent_buffer *eb)
462 if (check_tree_block(root->fs_info, eb)) {
463 print_tree_block_error(root->fs_info, eb,
464 check_tree_block(root->fs_info, eb));
468 if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
471 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
472 csum_tree_block(root, eb, 0);
474 return write_and_map_eb(root, eb);
477 void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
481 root->commit_root = NULL;
483 root->track_dirty = 0;
485 root->fs_info = fs_info;
486 root->objectid = objectid;
487 root->last_trans = 0;
488 root->last_inode_alloc = 0;
490 INIT_LIST_HEAD(&root->dirty_list);
491 INIT_LIST_HEAD(&root->orphan_data_extents);
492 memset(&root->root_key, 0, sizeof(root->root_key));
493 memset(&root->root_item, 0, sizeof(root->root_item));
494 root->root_key.objectid = objectid;
497 static int update_cowonly_root(struct btrfs_trans_handle *trans,
498 struct btrfs_root *root)
502 struct btrfs_root *tree_root = root->fs_info->tree_root;
504 btrfs_write_dirty_block_groups(trans, root);
506 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
507 if (old_root_bytenr == root->node->start)
509 btrfs_set_root_bytenr(&root->root_item,
511 btrfs_set_root_generation(&root->root_item,
513 root->root_item.level = btrfs_header_level(root->node);
514 ret = btrfs_update_root(trans, tree_root,
518 btrfs_write_dirty_block_groups(trans, root);
523 static int commit_tree_roots(struct btrfs_trans_handle *trans,
524 struct btrfs_fs_info *fs_info)
526 struct btrfs_root *root;
527 struct list_head *next;
528 struct extent_buffer *eb;
531 if (fs_info->readonly)
534 eb = fs_info->tree_root->node;
535 extent_buffer_get(eb);
536 ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
537 free_extent_buffer(eb);
541 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
542 next = fs_info->dirty_cowonly_roots.next;
544 root = list_entry(next, struct btrfs_root, dirty_list);
545 update_cowonly_root(trans, root);
546 free_extent_buffer(root->commit_root);
547 root->commit_root = NULL;
553 static int __commit_transaction(struct btrfs_trans_handle *trans,
554 struct btrfs_root *root)
558 struct extent_buffer *eb;
559 struct extent_io_tree *tree = &root->fs_info->extent_cache;
563 ret = find_first_extent_bit(tree, 0, &start, &end,
567 while(start <= end) {
568 eb = find_first_extent_buffer(tree, start);
569 BUG_ON(!eb || eb->start != start);
570 ret = write_tree_block(trans, root, eb);
573 clear_extent_buffer_dirty(eb);
574 free_extent_buffer(eb);
580 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
581 struct btrfs_root *root)
583 u64 transid = trans->transid;
585 struct btrfs_fs_info *fs_info = root->fs_info;
587 if (root->commit_root == root->node)
589 if (root == root->fs_info->tree_root)
591 if (root == root->fs_info->chunk_root)
594 free_extent_buffer(root->commit_root);
595 root->commit_root = NULL;
597 btrfs_set_root_bytenr(&root->root_item, root->node->start);
598 btrfs_set_root_generation(&root->root_item, trans->transid);
599 root->root_item.level = btrfs_header_level(root->node);
600 ret = btrfs_update_root(trans, root->fs_info->tree_root,
601 &root->root_key, &root->root_item);
604 ret = commit_tree_roots(trans, fs_info);
606 ret = __commit_transaction(trans, root);
608 write_ctree_super(trans, root);
609 btrfs_finish_extent_commit(trans, fs_info->extent_root,
610 &fs_info->pinned_extents);
612 free_extent_buffer(root->commit_root);
613 root->commit_root = NULL;
614 fs_info->running_transaction = NULL;
615 fs_info->last_trans_committed = transid;
619 static int find_and_setup_root(struct btrfs_root *tree_root,
620 struct btrfs_fs_info *fs_info,
621 u64 objectid, struct btrfs_root *root)
627 btrfs_setup_root(root, fs_info, objectid);
628 ret = btrfs_find_last_root(tree_root, objectid,
629 &root->root_item, &root->root_key);
633 blocksize = fs_info->nodesize;
634 generation = btrfs_root_generation(&root->root_item);
635 root->node = read_tree_block(fs_info,
636 btrfs_root_bytenr(&root->root_item),
637 blocksize, generation);
638 if (!extent_buffer_uptodate(root->node))
644 static int find_and_setup_log_root(struct btrfs_root *tree_root,
645 struct btrfs_fs_info *fs_info,
646 struct btrfs_super_block *disk_super)
649 u64 blocknr = btrfs_super_log_root(disk_super);
650 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
660 blocksize = fs_info->nodesize;
662 btrfs_setup_root(log_root, fs_info,
663 BTRFS_TREE_LOG_OBJECTID);
665 log_root->node = read_tree_block(fs_info, blocknr,
667 btrfs_super_generation(disk_super) + 1);
669 fs_info->log_root_tree = log_root;
671 if (!extent_buffer_uptodate(log_root->node)) {
672 free_extent_buffer(log_root->node);
674 fs_info->log_root_tree = NULL;
681 int btrfs_free_fs_root(struct btrfs_root *root)
684 free_extent_buffer(root->node);
685 if (root->commit_root)
686 free_extent_buffer(root->commit_root);
691 static void __free_fs_root(struct rb_node *node)
693 struct btrfs_root *root;
695 root = container_of(node, struct btrfs_root, rb_node);
696 btrfs_free_fs_root(root);
699 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
701 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
702 struct btrfs_key *location)
704 struct btrfs_root *root;
705 struct btrfs_root *tree_root = fs_info->tree_root;
706 struct btrfs_path *path;
707 struct extent_buffer *l;
712 root = calloc(1, sizeof(*root));
714 return ERR_PTR(-ENOMEM);
715 if (location->offset == (u64)-1) {
716 ret = find_and_setup_root(tree_root, fs_info,
717 location->objectid, root);
725 btrfs_setup_root(root, fs_info,
728 path = btrfs_alloc_path();
731 return ERR_PTR(-ENOMEM);
734 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
741 read_extent_buffer(l, &root->root_item,
742 btrfs_item_ptr_offset(l, path->slots[0]),
743 sizeof(root->root_item));
744 memcpy(&root->root_key, location, sizeof(*location));
747 btrfs_free_path(path);
752 generation = btrfs_root_generation(&root->root_item);
753 blocksize = fs_info->nodesize;
754 root->node = read_tree_block(fs_info,
755 btrfs_root_bytenr(&root->root_item),
756 blocksize, generation);
757 if (!extent_buffer_uptodate(root->node)) {
759 return ERR_PTR(-EIO);
766 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
769 u64 objectid = *((u64 *)data);
770 struct btrfs_root *root;
772 root = rb_entry(node, struct btrfs_root, rb_node);
773 if (objectid > root->objectid)
775 else if (objectid < root->objectid)
781 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
782 struct rb_node *node2)
784 struct btrfs_root *root;
786 root = rb_entry(node2, struct btrfs_root, rb_node);
787 return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
790 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
791 struct btrfs_key *location)
793 struct btrfs_root *root;
794 struct rb_node *node;
796 u64 objectid = location->objectid;
798 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
799 return fs_info->tree_root;
800 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
801 return fs_info->extent_root;
802 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
803 return fs_info->chunk_root;
804 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
805 return fs_info->dev_root;
806 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
807 return fs_info->csum_root;
808 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
809 return fs_info->quota_enabled ? fs_info->quota_root :
812 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
813 location->offset != (u64)-1);
815 node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
816 btrfs_fs_roots_compare_objectids, NULL);
818 return container_of(node, struct btrfs_root, rb_node);
820 root = btrfs_read_fs_root_no_cache(fs_info, location);
824 ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
825 btrfs_fs_roots_compare_roots);
830 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
832 if (fs_info->quota_root)
833 free(fs_info->quota_root);
835 free(fs_info->tree_root);
836 free(fs_info->extent_root);
837 free(fs_info->chunk_root);
838 free(fs_info->dev_root);
839 free(fs_info->csum_root);
840 free(fs_info->free_space_root);
841 free(fs_info->super_copy);
842 free(fs_info->log_root_tree);
846 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
848 struct btrfs_fs_info *fs_info;
850 fs_info = calloc(1, sizeof(struct btrfs_fs_info));
854 fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
855 fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
856 fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
857 fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
858 fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
859 fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
860 fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
861 fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
863 if (!fs_info->tree_root || !fs_info->extent_root ||
864 !fs_info->chunk_root || !fs_info->dev_root ||
865 !fs_info->csum_root || !fs_info->quota_root ||
866 !fs_info->free_space_root || !fs_info->super_copy)
869 extent_io_tree_init(&fs_info->extent_cache);
870 extent_io_tree_init(&fs_info->free_space_cache);
871 extent_io_tree_init(&fs_info->block_group_cache);
872 extent_io_tree_init(&fs_info->pinned_extents);
873 extent_io_tree_init(&fs_info->pending_del);
874 extent_io_tree_init(&fs_info->extent_ins);
875 fs_info->excluded_extents = NULL;
877 fs_info->fs_root_tree = RB_ROOT;
878 cache_tree_init(&fs_info->mapping_tree.cache_tree);
880 mutex_init(&fs_info->fs_mutex);
881 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
882 INIT_LIST_HEAD(&fs_info->space_info);
883 INIT_LIST_HEAD(&fs_info->recow_ebs);
886 fs_info->readonly = 1;
888 fs_info->super_bytenr = sb_bytenr;
889 fs_info->data_alloc_profile = (u64)-1;
890 fs_info->metadata_alloc_profile = (u64)-1;
891 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
894 btrfs_free_fs_info(fs_info);
898 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
903 features = btrfs_super_incompat_flags(sb) &
904 ~BTRFS_FEATURE_INCOMPAT_SUPP;
906 printk("couldn't open because of unsupported "
907 "option features (%Lx).\n",
908 (unsigned long long)features);
912 features = btrfs_super_incompat_flags(sb);
913 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
914 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
915 btrfs_set_super_incompat_flags(sb, features);
918 features = btrfs_super_compat_ro_flags(sb);
919 if (flags & OPEN_CTREE_WRITES) {
920 if (flags & OPEN_CTREE_INVALIDATE_FST) {
921 /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
922 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
923 btrfs_set_super_compat_ro_flags(sb, features);
924 /* ... and ignore the free space tree bit. */
925 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
927 if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
928 printk("couldn't open RDWR because of unsupported "
929 "option features (%Lx).\n",
930 (unsigned long long)features);
938 static int find_best_backup_root(struct btrfs_super_block *super)
940 struct btrfs_root_backup *backup;
941 u64 orig_gen = btrfs_super_generation(super);
946 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
947 backup = super->super_roots + i;
948 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
949 btrfs_backup_tree_root_gen(backup) > gen) {
951 gen = btrfs_backup_tree_root_gen(backup);
957 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
959 struct btrfs_root *info_root,
960 u64 objectid, char *str)
962 struct btrfs_super_block *sb = fs_info->super_copy;
963 struct btrfs_root *root = fs_info->tree_root;
964 u32 nodesize = btrfs_super_nodesize(sb);
967 ret = find_and_setup_root(root, fs_info, objectid, info_root);
969 printk("Couldn't setup %s tree\n", str);
970 if (!(flags & OPEN_CTREE_PARTIAL))
973 * Need a blank node here just so we don't screw up in the
974 * million of places that assume a root has a valid ->node
977 btrfs_find_create_tree_block(fs_info, 0, nodesize);
978 if (!info_root->node)
980 clear_extent_buffer_uptodate(info_root->node);
986 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
989 struct btrfs_super_block *sb = fs_info->super_copy;
990 struct btrfs_root *root;
991 struct btrfs_key key;
996 root = fs_info->tree_root;
997 btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
998 blocksize = fs_info->nodesize;
999 generation = btrfs_super_generation(sb);
1001 if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
1002 root_tree_bytenr = btrfs_super_root(sb);
1003 } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
1004 struct btrfs_root_backup *backup;
1005 int index = find_best_backup_root(sb);
1006 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
1007 fprintf(stderr, "Invalid backup root number\n");
1010 backup = fs_info->super_copy->super_roots + index;
1011 root_tree_bytenr = btrfs_backup_tree_root(backup);
1012 generation = btrfs_backup_tree_root_gen(backup);
1015 root->node = read_tree_block(fs_info, root_tree_bytenr, blocksize,
1017 if (!extent_buffer_uptodate(root->node)) {
1018 fprintf(stderr, "Couldn't read tree root\n");
1022 ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
1023 BTRFS_EXTENT_TREE_OBJECTID, "extent");
1026 fs_info->extent_root->track_dirty = 1;
1028 ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1031 printk("Couldn't setup device tree\n");
1034 fs_info->dev_root->track_dirty = 1;
1036 ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1037 BTRFS_CSUM_TREE_OBJECTID, "csum");
1040 fs_info->csum_root->track_dirty = 1;
1042 ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1043 fs_info->quota_root);
1045 free(fs_info->quota_root);
1046 fs_info->quota_root = NULL;
1048 fs_info->quota_enabled = 1;
1051 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
1052 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1053 fs_info->free_space_root);
1055 printk("Couldn't read free space tree\n");
1058 fs_info->free_space_root->track_dirty = 1;
1061 ret = find_and_setup_log_root(root, fs_info, sb);
1063 printk("Couldn't setup log root tree\n");
1064 if (!(flags & OPEN_CTREE_PARTIAL))
1068 fs_info->generation = generation;
1069 fs_info->last_trans_committed = generation;
1070 if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1071 !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1072 btrfs_read_block_groups(fs_info->tree_root);
1074 key.objectid = BTRFS_FS_TREE_OBJECTID;
1075 key.type = BTRFS_ROOT_ITEM_KEY;
1076 key.offset = (u64)-1;
1077 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1079 if (IS_ERR(fs_info->fs_root))
1084 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1086 if (fs_info->free_space_root)
1087 free_extent_buffer(fs_info->free_space_root->node);
1088 if (fs_info->quota_root)
1089 free_extent_buffer(fs_info->quota_root->node);
1090 if (fs_info->csum_root)
1091 free_extent_buffer(fs_info->csum_root->node);
1092 if (fs_info->dev_root)
1093 free_extent_buffer(fs_info->dev_root->node);
1094 if (fs_info->extent_root)
1095 free_extent_buffer(fs_info->extent_root->node);
1096 if (fs_info->tree_root)
1097 free_extent_buffer(fs_info->tree_root->node);
1098 if (fs_info->log_root_tree)
1099 free_extent_buffer(fs_info->log_root_tree->node);
1100 if (fs_info->chunk_root)
1101 free_extent_buffer(fs_info->chunk_root->node);
1104 static void free_map_lookup(struct cache_extent *ce)
1106 struct map_lookup *map;
1108 map = container_of(ce, struct map_lookup, ce);
1112 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1114 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1116 while (!list_empty(&fs_info->recow_ebs)) {
1117 struct extent_buffer *eb;
1118 eb = list_first_entry(&fs_info->recow_ebs,
1119 struct extent_buffer, recow);
1120 list_del_init(&eb->recow);
1121 free_extent_buffer(eb);
1123 free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1124 extent_io_tree_cleanup(&fs_info->extent_cache);
1125 extent_io_tree_cleanup(&fs_info->free_space_cache);
1126 extent_io_tree_cleanup(&fs_info->block_group_cache);
1127 extent_io_tree_cleanup(&fs_info->pinned_extents);
1128 extent_io_tree_cleanup(&fs_info->pending_del);
1129 extent_io_tree_cleanup(&fs_info->extent_ins);
1132 int btrfs_scan_fs_devices(int fd, const char *path,
1133 struct btrfs_fs_devices **fs_devices,
1134 u64 sb_bytenr, unsigned sbflags,
1142 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1144 seek_ret = lseek(fd, 0, SEEK_END);
1148 dev_size = seek_ret;
1149 lseek(fd, 0, SEEK_SET);
1150 if (sb_bytenr > dev_size) {
1151 error("superblock bytenr %llu is larger than device size %llu",
1152 (unsigned long long)sb_bytenr,
1153 (unsigned long long)dev_size);
1157 ret = btrfs_scan_one_device(fd, path, fs_devices,
1158 &total_devs, sb_bytenr, sbflags);
1160 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1164 if (!skip_devices && total_devs != 1) {
1165 ret = btrfs_scan_devices();
1172 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1173 u64 chunk_root_bytenr)
1175 struct btrfs_super_block *sb = fs_info->super_copy;
1179 btrfs_setup_root(fs_info->chunk_root, fs_info,
1180 BTRFS_CHUNK_TREE_OBJECTID);
1182 ret = btrfs_read_sys_array(fs_info->chunk_root);
1186 generation = btrfs_super_chunk_root_generation(sb);
1188 if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1189 fs_info->sectorsize)) {
1190 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1191 chunk_root_bytenr, fs_info->sectorsize);
1192 chunk_root_bytenr = 0;
1195 if (!chunk_root_bytenr)
1196 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1200 fs_info->chunk_root->node = read_tree_block(fs_info,
1204 if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1205 if (fs_info->ignore_chunk_tree_error) {
1206 warning("cannot read chunk root, continue anyway");
1207 fs_info->chunk_root = NULL;
1210 error("cannot read chunk root");
1215 if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1216 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1218 fprintf(stderr, "Couldn't read chunk tree\n");
1225 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1227 u64 root_tree_bytenr,
1228 u64 chunk_root_bytenr,
1231 struct btrfs_fs_info *fs_info;
1232 struct btrfs_super_block *disk_super;
1233 struct btrfs_fs_devices *fs_devices = NULL;
1234 struct extent_buffer *eb;
1237 unsigned sbflags = SBREAD_DEFAULT;
1240 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1242 /* try to drop all the caches */
1243 if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1244 fprintf(stderr, "Warning, could not drop caches\n");
1246 fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1248 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1251 if (flags & OPEN_CTREE_RESTORE)
1252 fs_info->on_restoring = 1;
1253 if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1254 fs_info->suppress_check_block_errors = 1;
1255 if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1256 fs_info->ignore_fsid_mismatch = 1;
1257 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1258 fs_info->ignore_chunk_tree_error = 1;
1260 if ((flags & OPEN_CTREE_RECOVER_SUPER)
1261 && (flags & OPEN_CTREE_FS_PARTIAL)) {
1263 "cannot open a partially created filesystem for recovery");
1267 if (flags & OPEN_CTREE_FS_PARTIAL)
1268 sbflags = SBREAD_PARTIAL;
1270 ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1271 (flags & OPEN_CTREE_NO_DEVICES));
1275 fs_info->fs_devices = fs_devices;
1276 if (flags & OPEN_CTREE_WRITES)
1281 if (flags & OPEN_CTREE_EXCLUSIVE)
1284 ret = btrfs_open_devices(fs_devices, oflags);
1288 disk_super = fs_info->super_copy;
1289 if (flags & OPEN_CTREE_RECOVER_SUPER)
1290 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1291 sb_bytenr, SBREAD_RECOVER);
1293 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1296 printk("No valid btrfs found\n");
1300 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1301 !fs_info->ignore_fsid_mismatch) {
1302 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1306 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1307 fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
1308 fs_info->nodesize = btrfs_super_nodesize(disk_super);
1309 fs_info->stripesize = btrfs_super_stripesize(disk_super);
1311 ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
1315 ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1319 /* Chunk tree root is unable to read, return directly */
1320 if (!fs_info->chunk_root)
1323 eb = fs_info->chunk_root->node;
1324 read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1325 btrfs_header_chunk_tree_uuid(eb),
1328 ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1329 if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1330 !fs_info->ignore_chunk_tree_error)
1336 btrfs_release_all_roots(fs_info);
1337 btrfs_cleanup_all_caches(fs_info);
1339 btrfs_close_devices(fs_devices);
1341 btrfs_free_fs_info(fs_info);
1345 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1346 u64 sb_bytenr, u64 root_tree_bytenr,
1347 u64 chunk_root_bytenr,
1352 struct btrfs_fs_info *info;
1353 int oflags = O_RDWR;
1356 ret = stat(filename, &st);
1358 error("cannot stat '%s': %s", filename, strerror(errno));
1361 if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1362 error("not a regular file or block device: %s", filename);
1366 if (!(flags & OPEN_CTREE_WRITES))
1369 fp = open(filename, oflags);
1371 error("cannot open '%s': %s", filename, strerror(errno));
1374 info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1375 chunk_root_bytenr, flags);
1380 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1383 struct btrfs_fs_info *info;
1385 /* This flags may not return fs_info with any valid root */
1386 BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1387 info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1390 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1391 return info->chunk_root;
1392 return info->fs_root;
1395 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1398 struct btrfs_fs_info *info;
1400 /* This flags may not return fs_info with any valid root */
1401 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
1402 error("invalid open_ctree flags: 0x%llx",
1403 (unsigned long long)flags);
1406 info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1409 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1410 return info->chunk_root;
1411 return info->fs_root;
1415 * Check if the super is valid:
1416 * - nodesize/sectorsize - minimum, maximum, alignment
1417 * - tree block starts - alignment
1418 * - number of devices - something sane
1419 * - sys array size - maximum
1421 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1423 u8 result[BTRFS_CSUM_SIZE];
1428 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1429 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1430 if (!(sbflags & SBREAD_PARTIAL)) {
1431 error("superblock magic doesn't match");
1437 csum_type = btrfs_super_csum_type(sb);
1438 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1439 error("unsupported checksum algorithm %u", csum_type);
1442 csum_size = btrfs_csum_sizes[csum_type];
1445 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1446 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1447 btrfs_csum_final(crc, result);
1449 if (memcmp(result, sb->csum, csum_size)) {
1450 error("superblock checksum mismatch");
1453 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1454 error("tree_root level too big: %d >= %d",
1455 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1458 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1459 error("chunk_root level too big: %d >= %d",
1460 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1463 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1464 error("log_root level too big: %d >= %d",
1465 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1469 if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1470 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1473 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1474 error("chunk_root block unaligned: %llu",
1475 btrfs_super_chunk_root(sb));
1478 if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1479 error("log_root block unaligned: %llu",
1480 btrfs_super_log_root(sb));
1483 if (btrfs_super_nodesize(sb) < 4096) {
1484 error("nodesize too small: %u < 4096",
1485 btrfs_super_nodesize(sb));
1488 if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1489 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1492 if (btrfs_super_sectorsize(sb) < 4096) {
1493 error("sectorsize too small: %u < 4096",
1494 btrfs_super_sectorsize(sb));
1497 if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1498 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1501 if (btrfs_super_total_bytes(sb) == 0) {
1502 error("invalid total_bytes 0");
1505 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1506 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1509 if ((btrfs_super_stripesize(sb) != 4096)
1510 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1511 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1515 if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1516 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1517 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1519 uuid_unparse(sb->fsid, fsid);
1520 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1521 error("dev_item UUID does not match fsid: %s != %s",
1527 * Hint to catch really bogus numbers, bitflips or so
1529 if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1530 warning("suspicious number of devices: %llu",
1531 btrfs_super_num_devices(sb));
1534 if (btrfs_super_num_devices(sb) == 0) {
1535 error("number of devices is 0");
1540 * Obvious sys_chunk_array corruptions, it must hold at least one key
1543 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1544 error("system chunk array too big %u > %u",
1545 btrfs_super_sys_array_size(sb),
1546 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1549 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1550 + sizeof(struct btrfs_chunk)) {
1551 error("system chunk array too small %u < %zu",
1552 btrfs_super_sys_array_size(sb),
1553 sizeof(struct btrfs_disk_key) +
1554 sizeof(struct btrfs_chunk));
1561 error("superblock checksum matches but it has invalid members");
1565 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1568 u8 fsid[BTRFS_FSID_SIZE];
1569 int fsid_is_initialized = 0;
1570 char tmp[BTRFS_SUPER_INFO_SIZE];
1571 struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1574 int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1578 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1579 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1584 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1585 if (ret < BTRFS_SUPER_INFO_SIZE)
1588 if (btrfs_super_bytenr(buf) != sb_bytenr)
1591 ret = check_super(buf, sbflags);
1594 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1599 * we would like to check all the supers, but that would make
1600 * a btrfs mount succeed after a mkfs from a different FS.
1601 * So, we need to add a special mount option to scan for
1602 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1605 for (i = 0; i < max_super; i++) {
1606 bytenr = btrfs_sb_offset(i);
1607 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1608 if (ret < BTRFS_SUPER_INFO_SIZE)
1611 if (btrfs_super_bytenr(buf) != bytenr )
1613 /* if magic is NULL, the device was removed */
1614 if (btrfs_super_magic(buf) == 0 && i == 0)
1616 if (check_super(buf, sbflags))
1619 if (!fsid_is_initialized) {
1620 memcpy(fsid, buf->fsid, sizeof(fsid));
1621 fsid_is_initialized = 1;
1622 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1624 * the superblocks (the original one and
1625 * its backups) contain data of different
1626 * filesystems -> the super cannot be trusted
1631 if (btrfs_super_generation(buf) > transid) {
1632 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1633 transid = btrfs_super_generation(buf);
1637 return transid > 0 ? 0 : -1;
1640 static int write_dev_supers(struct btrfs_root *root,
1641 struct btrfs_super_block *sb,
1642 struct btrfs_device *device)
1648 if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1649 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1651 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1652 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1653 btrfs_csum_final(crc, &sb->csum[0]);
1656 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1657 * zero filled, we can use it directly
1659 ret = pwrite64(device->fd, root->fs_info->super_copy,
1660 BTRFS_SUPER_INFO_SIZE,
1661 root->fs_info->super_bytenr);
1662 if (ret != BTRFS_SUPER_INFO_SIZE)
1667 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1668 bytenr = btrfs_sb_offset(i);
1669 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1672 btrfs_set_super_bytenr(sb, bytenr);
1675 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1676 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1677 btrfs_csum_final(crc, &sb->csum[0]);
1680 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1681 * zero filled, we can use it directly
1683 ret = pwrite64(device->fd, root->fs_info->super_copy,
1684 BTRFS_SUPER_INFO_SIZE, bytenr);
1685 if (ret != BTRFS_SUPER_INFO_SIZE)
1693 fprintf(stderr, "WARNING: failed to write all sb data\n");
1695 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1700 int write_all_supers(struct btrfs_root *root)
1702 struct list_head *cur;
1703 struct list_head *head = &root->fs_info->fs_devices->devices;
1704 struct btrfs_device *dev;
1705 struct btrfs_super_block *sb;
1706 struct btrfs_dev_item *dev_item;
1710 sb = root->fs_info->super_copy;
1711 dev_item = &sb->dev_item;
1712 list_for_each(cur, head) {
1713 dev = list_entry(cur, struct btrfs_device, dev_list);
1714 if (!dev->writeable)
1717 btrfs_set_stack_device_generation(dev_item, 0);
1718 btrfs_set_stack_device_type(dev_item, dev->type);
1719 btrfs_set_stack_device_id(dev_item, dev->devid);
1720 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1721 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1722 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1723 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1724 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1725 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1726 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1728 flags = btrfs_super_flags(sb);
1729 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1731 ret = write_dev_supers(root, sb, dev);
1737 int write_ctree_super(struct btrfs_trans_handle *trans,
1738 struct btrfs_root *root)
1741 struct btrfs_root *tree_root = root->fs_info->tree_root;
1742 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1744 if (root->fs_info->readonly)
1747 btrfs_set_super_generation(root->fs_info->super_copy,
1749 btrfs_set_super_root(root->fs_info->super_copy,
1750 tree_root->node->start);
1751 btrfs_set_super_root_level(root->fs_info->super_copy,
1752 btrfs_header_level(tree_root->node));
1753 btrfs_set_super_chunk_root(root->fs_info->super_copy,
1754 chunk_root->node->start);
1755 btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1756 btrfs_header_level(chunk_root->node));
1757 btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1758 btrfs_header_generation(chunk_root->node));
1760 ret = write_all_supers(root);
1762 fprintf(stderr, "failed to write new super block err %d\n", ret);
1766 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1769 struct btrfs_trans_handle *trans;
1770 struct btrfs_root *root = fs_info->tree_root;
1772 if (fs_info->last_trans_committed !=
1773 fs_info->generation) {
1775 trans = btrfs_start_transaction(root, 1);
1776 btrfs_commit_transaction(trans, root);
1777 trans = btrfs_start_transaction(root, 1);
1778 ret = commit_tree_roots(trans, fs_info);
1780 ret = __commit_transaction(trans, root);
1782 write_ctree_super(trans, root);
1786 if (fs_info->finalize_on_close) {
1787 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1788 root->fs_info->finalize_on_close = 0;
1789 ret = write_all_supers(root);
1792 "failed to write new super block err %d\n", ret);
1794 btrfs_free_block_groups(fs_info);
1796 free_fs_roots_tree(&fs_info->fs_root_tree);
1798 btrfs_release_all_roots(fs_info);
1799 ret = btrfs_close_devices(fs_info->fs_devices);
1800 btrfs_cleanup_all_caches(fs_info);
1801 btrfs_free_fs_info(fs_info);
1805 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1806 struct extent_buffer *eb)
1808 return clear_extent_buffer_dirty(eb);
1811 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1813 set_extent_buffer_dirty(eb);
1816 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1820 ret = extent_buffer_uptodate(buf);
1824 ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1828 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1830 return set_extent_buffer_uptodate(eb);