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 int csum_tree_block(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 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
178 u64 bytenr, u32 blocksize)
180 return find_extent_buffer(&root->fs_info->extent_cache,
184 struct extent_buffer* btrfs_find_create_tree_block(
185 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize)
187 return alloc_extent_buffer(&fs_info->extent_cache, bytenr, blocksize);
190 void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
193 struct extent_buffer *eb;
195 struct btrfs_multi_bio *multi = NULL;
196 struct btrfs_device *device;
198 eb = btrfs_find_tree_block(root, bytenr, blocksize);
199 if (!(eb && btrfs_buffer_uptodate(eb, parent_transid)) &&
200 !btrfs_map_block(root->fs_info, READ, bytenr, &length, &multi, 0,
202 device = multi->stripes[0].dev;
204 blocksize = min(blocksize, (u32)SZ_64K);
205 readahead(device->fd, multi->stripes[0].physical, blocksize);
208 free_extent_buffer(eb);
212 static int verify_parent_transid(struct extent_io_tree *io_tree,
213 struct extent_buffer *eb, u64 parent_transid,
218 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
221 if (extent_buffer_uptodate(eb) &&
222 btrfs_header_generation(eb) == parent_transid) {
226 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
227 (unsigned long long)eb->start,
228 (unsigned long long)parent_transid,
229 (unsigned long long)btrfs_header_generation(eb));
231 eb->flags |= EXTENT_BAD_TRANSID;
232 printk("Ignoring transid failure\n");
238 clear_extent_buffer_uptodate(eb);
244 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
246 unsigned long offset = 0;
247 struct btrfs_multi_bio *multi = NULL;
248 struct btrfs_device *device;
251 unsigned long bytes_left = eb->len;
254 read_len = bytes_left;
257 if (!info->on_restoring &&
258 eb->start != BTRFS_SUPER_INFO_OFFSET) {
259 ret = btrfs_map_block(info, READ, eb->start + offset,
260 &read_len, &multi, mirror, NULL);
262 printk("Couldn't map the block %Lu\n", eb->start + offset);
266 device = multi->stripes[0].dev;
268 if (device->fd <= 0) {
275 eb->dev_bytenr = multi->stripes[0].physical;
279 /* special case for restore metadump */
280 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
281 if (device->devid == 1)
286 eb->dev_bytenr = eb->start;
290 if (read_len > bytes_left)
291 read_len = bytes_left;
293 ret = read_extent_from_disk(eb, offset, read_len);
297 bytes_left -= read_len;
302 struct extent_buffer* read_tree_block(
303 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
307 struct extent_buffer *eb;
308 u64 best_transid = 0;
309 u32 sectorsize = fs_info->sectorsize;
310 u32 nodesize = fs_info->nodesize;
317 * Don't even try to create tree block for unaligned tree block
319 * Such unaligned tree block will free overlapping extent buffer,
320 * causing use-after-free bugs for fuzzed images.
322 if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
323 error("tree block bytenr %llu is not aligned to sectorsize %u",
325 return ERR_PTR(-EIO);
327 if (blocksize < nodesize || !IS_ALIGNED(blocksize, nodesize)) {
328 error("tree block size %u is not aligned to nodesize %u",
329 blocksize, nodesize);
330 return ERR_PTR(-EIO);
333 eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
335 return ERR_PTR(-ENOMEM);
337 if (btrfs_buffer_uptodate(eb, parent_transid))
341 ret = read_whole_eb(fs_info, eb, mirror_num);
342 if (ret == 0 && csum_tree_block(fs_info, eb, 1) == 0 &&
343 check_tree_block(fs_info, eb) == 0 &&
344 verify_parent_transid(eb->tree, eb, parent_transid, ignore)
346 if (eb->flags & EXTENT_BAD_TRANSID &&
347 list_empty(&eb->recow)) {
348 list_add_tail(&eb->recow,
349 &fs_info->recow_ebs);
352 btrfs_set_buffer_uptodate(eb);
356 if (check_tree_block(fs_info, eb)) {
357 if (!fs_info->suppress_check_block_errors)
358 print_tree_block_error(fs_info, eb,
359 check_tree_block(fs_info, eb));
361 if (!fs_info->suppress_check_block_errors)
362 fprintf(stderr, "Csum didn't match\n");
367 num_copies = btrfs_num_copies(fs_info, eb->start, eb->len);
368 if (num_copies == 1) {
372 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
373 best_transid = btrfs_header_generation(eb);
374 good_mirror = mirror_num;
377 if (mirror_num > num_copies) {
378 mirror_num = good_mirror;
383 free_extent_buffer(eb);
387 int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
388 u64 *len, int mirror)
391 struct btrfs_multi_bio *multi = NULL;
392 struct btrfs_device *device;
396 ret = btrfs_map_block(fs_info, READ, logical, len, &multi, mirror,
399 fprintf(stderr, "Couldn't map the block %llu\n",
403 device = multi->stripes[0].dev;
410 ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
420 int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
425 u64 *raid_map = NULL;
426 struct btrfs_multi_bio *multi = NULL;
430 ret = btrfs_map_block(fs_info, WRITE, eb->start, &length,
431 &multi, 0, &raid_map);
434 ret = write_raid56_with_parity(fs_info, eb, multi,
437 } else while (dev_nr < multi->num_stripes) {
439 eb->fd = multi->stripes[dev_nr].dev->fd;
440 eb->dev_bytenr = multi->stripes[dev_nr].physical;
441 multi->stripes[dev_nr].dev->total_ios++;
443 ret = write_extent_to_disk(eb);
451 int write_tree_block(struct btrfs_trans_handle *trans,
452 struct btrfs_fs_info *fs_info,
453 struct extent_buffer *eb)
455 if (check_tree_block(fs_info, eb)) {
456 print_tree_block_error(fs_info, eb,
457 check_tree_block(fs_info, eb));
461 if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
464 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
465 csum_tree_block(fs_info, eb, 0);
467 return write_and_map_eb(fs_info, eb);
470 void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
474 root->commit_root = NULL;
476 root->track_dirty = 0;
478 root->fs_info = fs_info;
479 root->objectid = objectid;
480 root->last_trans = 0;
481 root->last_inode_alloc = 0;
483 INIT_LIST_HEAD(&root->dirty_list);
484 INIT_LIST_HEAD(&root->orphan_data_extents);
485 memset(&root->root_key, 0, sizeof(root->root_key));
486 memset(&root->root_item, 0, sizeof(root->root_item));
487 root->root_key.objectid = objectid;
490 static int update_cowonly_root(struct btrfs_trans_handle *trans,
491 struct btrfs_root *root)
495 struct btrfs_root *tree_root = root->fs_info->tree_root;
497 btrfs_write_dirty_block_groups(trans, root);
499 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
500 if (old_root_bytenr == root->node->start)
502 btrfs_set_root_bytenr(&root->root_item,
504 btrfs_set_root_generation(&root->root_item,
506 root->root_item.level = btrfs_header_level(root->node);
507 ret = btrfs_update_root(trans, tree_root,
511 btrfs_write_dirty_block_groups(trans, root);
516 static int commit_tree_roots(struct btrfs_trans_handle *trans,
517 struct btrfs_fs_info *fs_info)
519 struct btrfs_root *root;
520 struct list_head *next;
521 struct extent_buffer *eb;
524 if (fs_info->readonly)
527 eb = fs_info->tree_root->node;
528 extent_buffer_get(eb);
529 ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
530 free_extent_buffer(eb);
534 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
535 next = fs_info->dirty_cowonly_roots.next;
537 root = list_entry(next, struct btrfs_root, dirty_list);
538 update_cowonly_root(trans, root);
539 free_extent_buffer(root->commit_root);
540 root->commit_root = NULL;
546 static int __commit_transaction(struct btrfs_trans_handle *trans,
547 struct btrfs_root *root)
551 struct btrfs_fs_info *fs_info = root->fs_info;
552 struct extent_buffer *eb;
553 struct extent_io_tree *tree = &fs_info->extent_cache;
557 ret = find_first_extent_bit(tree, 0, &start, &end,
561 while(start <= end) {
562 eb = find_first_extent_buffer(tree, start);
563 BUG_ON(!eb || eb->start != start);
564 ret = write_tree_block(trans, fs_info, eb);
567 clear_extent_buffer_dirty(eb);
568 free_extent_buffer(eb);
574 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
575 struct btrfs_root *root)
577 u64 transid = trans->transid;
579 struct btrfs_fs_info *fs_info = root->fs_info;
581 if (root->commit_root == root->node)
583 if (root == root->fs_info->tree_root)
585 if (root == root->fs_info->chunk_root)
588 free_extent_buffer(root->commit_root);
589 root->commit_root = NULL;
591 btrfs_set_root_bytenr(&root->root_item, root->node->start);
592 btrfs_set_root_generation(&root->root_item, trans->transid);
593 root->root_item.level = btrfs_header_level(root->node);
594 ret = btrfs_update_root(trans, root->fs_info->tree_root,
595 &root->root_key, &root->root_item);
598 ret = commit_tree_roots(trans, fs_info);
600 ret = __commit_transaction(trans, root);
602 write_ctree_super(trans, root);
603 btrfs_finish_extent_commit(trans, fs_info->extent_root,
604 &fs_info->pinned_extents);
606 free_extent_buffer(root->commit_root);
607 root->commit_root = NULL;
608 fs_info->running_transaction = NULL;
609 fs_info->last_trans_committed = transid;
613 static int find_and_setup_root(struct btrfs_root *tree_root,
614 struct btrfs_fs_info *fs_info,
615 u64 objectid, struct btrfs_root *root)
621 btrfs_setup_root(root, fs_info, objectid);
622 ret = btrfs_find_last_root(tree_root, objectid,
623 &root->root_item, &root->root_key);
627 blocksize = fs_info->nodesize;
628 generation = btrfs_root_generation(&root->root_item);
629 root->node = read_tree_block(fs_info,
630 btrfs_root_bytenr(&root->root_item),
631 blocksize, generation);
632 if (!extent_buffer_uptodate(root->node))
638 static int find_and_setup_log_root(struct btrfs_root *tree_root,
639 struct btrfs_fs_info *fs_info,
640 struct btrfs_super_block *disk_super)
643 u64 blocknr = btrfs_super_log_root(disk_super);
644 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
654 blocksize = fs_info->nodesize;
656 btrfs_setup_root(log_root, fs_info,
657 BTRFS_TREE_LOG_OBJECTID);
659 log_root->node = read_tree_block(fs_info, blocknr,
661 btrfs_super_generation(disk_super) + 1);
663 fs_info->log_root_tree = log_root;
665 if (!extent_buffer_uptodate(log_root->node)) {
666 free_extent_buffer(log_root->node);
668 fs_info->log_root_tree = NULL;
675 int btrfs_free_fs_root(struct btrfs_root *root)
678 free_extent_buffer(root->node);
679 if (root->commit_root)
680 free_extent_buffer(root->commit_root);
685 static void __free_fs_root(struct rb_node *node)
687 struct btrfs_root *root;
689 root = container_of(node, struct btrfs_root, rb_node);
690 btrfs_free_fs_root(root);
693 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
695 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
696 struct btrfs_key *location)
698 struct btrfs_root *root;
699 struct btrfs_root *tree_root = fs_info->tree_root;
700 struct btrfs_path *path;
701 struct extent_buffer *l;
706 root = calloc(1, sizeof(*root));
708 return ERR_PTR(-ENOMEM);
709 if (location->offset == (u64)-1) {
710 ret = find_and_setup_root(tree_root, fs_info,
711 location->objectid, root);
719 btrfs_setup_root(root, fs_info,
722 path = btrfs_alloc_path();
725 return ERR_PTR(-ENOMEM);
728 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
735 read_extent_buffer(l, &root->root_item,
736 btrfs_item_ptr_offset(l, path->slots[0]),
737 sizeof(root->root_item));
738 memcpy(&root->root_key, location, sizeof(*location));
741 btrfs_free_path(path);
746 generation = btrfs_root_generation(&root->root_item);
747 blocksize = fs_info->nodesize;
748 root->node = read_tree_block(fs_info,
749 btrfs_root_bytenr(&root->root_item),
750 blocksize, generation);
751 if (!extent_buffer_uptodate(root->node)) {
753 return ERR_PTR(-EIO);
760 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
763 u64 objectid = *((u64 *)data);
764 struct btrfs_root *root;
766 root = rb_entry(node, struct btrfs_root, rb_node);
767 if (objectid > root->objectid)
769 else if (objectid < root->objectid)
775 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
776 struct rb_node *node2)
778 struct btrfs_root *root;
780 root = rb_entry(node2, struct btrfs_root, rb_node);
781 return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
784 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
785 struct btrfs_key *location)
787 struct btrfs_root *root;
788 struct rb_node *node;
790 u64 objectid = location->objectid;
792 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
793 return fs_info->tree_root;
794 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
795 return fs_info->extent_root;
796 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
797 return fs_info->chunk_root;
798 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
799 return fs_info->dev_root;
800 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
801 return fs_info->csum_root;
802 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
803 return fs_info->quota_enabled ? fs_info->quota_root :
806 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
807 location->offset != (u64)-1);
809 node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
810 btrfs_fs_roots_compare_objectids, NULL);
812 return container_of(node, struct btrfs_root, rb_node);
814 root = btrfs_read_fs_root_no_cache(fs_info, location);
818 ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
819 btrfs_fs_roots_compare_roots);
824 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
826 if (fs_info->quota_root)
827 free(fs_info->quota_root);
829 free(fs_info->tree_root);
830 free(fs_info->extent_root);
831 free(fs_info->chunk_root);
832 free(fs_info->dev_root);
833 free(fs_info->csum_root);
834 free(fs_info->free_space_root);
835 free(fs_info->super_copy);
836 free(fs_info->log_root_tree);
840 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
842 struct btrfs_fs_info *fs_info;
844 fs_info = calloc(1, sizeof(struct btrfs_fs_info));
848 fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
849 fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
850 fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
851 fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
852 fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
853 fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
854 fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
855 fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
857 if (!fs_info->tree_root || !fs_info->extent_root ||
858 !fs_info->chunk_root || !fs_info->dev_root ||
859 !fs_info->csum_root || !fs_info->quota_root ||
860 !fs_info->free_space_root || !fs_info->super_copy)
863 extent_io_tree_init(&fs_info->extent_cache);
864 extent_io_tree_init(&fs_info->free_space_cache);
865 extent_io_tree_init(&fs_info->block_group_cache);
866 extent_io_tree_init(&fs_info->pinned_extents);
867 extent_io_tree_init(&fs_info->pending_del);
868 extent_io_tree_init(&fs_info->extent_ins);
869 fs_info->excluded_extents = NULL;
871 fs_info->fs_root_tree = RB_ROOT;
872 cache_tree_init(&fs_info->mapping_tree.cache_tree);
874 mutex_init(&fs_info->fs_mutex);
875 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
876 INIT_LIST_HEAD(&fs_info->space_info);
877 INIT_LIST_HEAD(&fs_info->recow_ebs);
880 fs_info->readonly = 1;
882 fs_info->super_bytenr = sb_bytenr;
883 fs_info->data_alloc_profile = (u64)-1;
884 fs_info->metadata_alloc_profile = (u64)-1;
885 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
888 btrfs_free_fs_info(fs_info);
892 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
897 features = btrfs_super_incompat_flags(sb) &
898 ~BTRFS_FEATURE_INCOMPAT_SUPP;
900 printk("couldn't open because of unsupported "
901 "option features (%Lx).\n",
902 (unsigned long long)features);
906 features = btrfs_super_incompat_flags(sb);
907 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
908 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
909 btrfs_set_super_incompat_flags(sb, features);
912 features = btrfs_super_compat_ro_flags(sb);
913 if (flags & OPEN_CTREE_WRITES) {
914 if (flags & OPEN_CTREE_INVALIDATE_FST) {
915 /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
916 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
917 btrfs_set_super_compat_ro_flags(sb, features);
918 /* ... and ignore the free space tree bit. */
919 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
921 if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
922 printk("couldn't open RDWR because of unsupported "
923 "option features (%Lx).\n",
924 (unsigned long long)features);
932 static int find_best_backup_root(struct btrfs_super_block *super)
934 struct btrfs_root_backup *backup;
935 u64 orig_gen = btrfs_super_generation(super);
940 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
941 backup = super->super_roots + i;
942 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
943 btrfs_backup_tree_root_gen(backup) > gen) {
945 gen = btrfs_backup_tree_root_gen(backup);
951 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
953 struct btrfs_root *info_root,
954 u64 objectid, char *str)
956 struct btrfs_super_block *sb = fs_info->super_copy;
957 struct btrfs_root *root = fs_info->tree_root;
958 u32 nodesize = btrfs_super_nodesize(sb);
961 ret = find_and_setup_root(root, fs_info, objectid, info_root);
963 printk("Couldn't setup %s tree\n", str);
964 if (!(flags & OPEN_CTREE_PARTIAL))
967 * Need a blank node here just so we don't screw up in the
968 * million of places that assume a root has a valid ->node
971 btrfs_find_create_tree_block(fs_info, 0, nodesize);
972 if (!info_root->node)
974 clear_extent_buffer_uptodate(info_root->node);
980 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
983 struct btrfs_super_block *sb = fs_info->super_copy;
984 struct btrfs_root *root;
985 struct btrfs_key key;
990 root = fs_info->tree_root;
991 btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
992 blocksize = fs_info->nodesize;
993 generation = btrfs_super_generation(sb);
995 if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
996 root_tree_bytenr = btrfs_super_root(sb);
997 } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
998 struct btrfs_root_backup *backup;
999 int index = find_best_backup_root(sb);
1000 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
1001 fprintf(stderr, "Invalid backup root number\n");
1004 backup = fs_info->super_copy->super_roots + index;
1005 root_tree_bytenr = btrfs_backup_tree_root(backup);
1006 generation = btrfs_backup_tree_root_gen(backup);
1009 root->node = read_tree_block(fs_info, root_tree_bytenr, blocksize,
1011 if (!extent_buffer_uptodate(root->node)) {
1012 fprintf(stderr, "Couldn't read tree root\n");
1016 ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
1017 BTRFS_EXTENT_TREE_OBJECTID, "extent");
1020 fs_info->extent_root->track_dirty = 1;
1022 ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1025 printk("Couldn't setup device tree\n");
1028 fs_info->dev_root->track_dirty = 1;
1030 ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1031 BTRFS_CSUM_TREE_OBJECTID, "csum");
1034 fs_info->csum_root->track_dirty = 1;
1036 ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1037 fs_info->quota_root);
1039 free(fs_info->quota_root);
1040 fs_info->quota_root = NULL;
1042 fs_info->quota_enabled = 1;
1045 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
1046 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1047 fs_info->free_space_root);
1049 printk("Couldn't read free space tree\n");
1052 fs_info->free_space_root->track_dirty = 1;
1055 ret = find_and_setup_log_root(root, fs_info, sb);
1057 printk("Couldn't setup log root tree\n");
1058 if (!(flags & OPEN_CTREE_PARTIAL))
1062 fs_info->generation = generation;
1063 fs_info->last_trans_committed = generation;
1064 if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1065 !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1066 btrfs_read_block_groups(fs_info->tree_root);
1068 key.objectid = BTRFS_FS_TREE_OBJECTID;
1069 key.type = BTRFS_ROOT_ITEM_KEY;
1070 key.offset = (u64)-1;
1071 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1073 if (IS_ERR(fs_info->fs_root))
1078 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1080 if (fs_info->free_space_root)
1081 free_extent_buffer(fs_info->free_space_root->node);
1082 if (fs_info->quota_root)
1083 free_extent_buffer(fs_info->quota_root->node);
1084 if (fs_info->csum_root)
1085 free_extent_buffer(fs_info->csum_root->node);
1086 if (fs_info->dev_root)
1087 free_extent_buffer(fs_info->dev_root->node);
1088 if (fs_info->extent_root)
1089 free_extent_buffer(fs_info->extent_root->node);
1090 if (fs_info->tree_root)
1091 free_extent_buffer(fs_info->tree_root->node);
1092 if (fs_info->log_root_tree)
1093 free_extent_buffer(fs_info->log_root_tree->node);
1094 if (fs_info->chunk_root)
1095 free_extent_buffer(fs_info->chunk_root->node);
1098 static void free_map_lookup(struct cache_extent *ce)
1100 struct map_lookup *map;
1102 map = container_of(ce, struct map_lookup, ce);
1106 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1108 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1110 while (!list_empty(&fs_info->recow_ebs)) {
1111 struct extent_buffer *eb;
1112 eb = list_first_entry(&fs_info->recow_ebs,
1113 struct extent_buffer, recow);
1114 list_del_init(&eb->recow);
1115 free_extent_buffer(eb);
1117 free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1118 extent_io_tree_cleanup(&fs_info->extent_cache);
1119 extent_io_tree_cleanup(&fs_info->free_space_cache);
1120 extent_io_tree_cleanup(&fs_info->block_group_cache);
1121 extent_io_tree_cleanup(&fs_info->pinned_extents);
1122 extent_io_tree_cleanup(&fs_info->pending_del);
1123 extent_io_tree_cleanup(&fs_info->extent_ins);
1126 int btrfs_scan_fs_devices(int fd, const char *path,
1127 struct btrfs_fs_devices **fs_devices,
1128 u64 sb_bytenr, unsigned sbflags,
1136 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1138 seek_ret = lseek(fd, 0, SEEK_END);
1142 dev_size = seek_ret;
1143 lseek(fd, 0, SEEK_SET);
1144 if (sb_bytenr > dev_size) {
1145 error("superblock bytenr %llu is larger than device size %llu",
1146 (unsigned long long)sb_bytenr,
1147 (unsigned long long)dev_size);
1151 ret = btrfs_scan_one_device(fd, path, fs_devices,
1152 &total_devs, sb_bytenr, sbflags);
1154 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1158 if (!skip_devices && total_devs != 1) {
1159 ret = btrfs_scan_devices();
1166 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1167 u64 chunk_root_bytenr)
1169 struct btrfs_super_block *sb = fs_info->super_copy;
1173 btrfs_setup_root(fs_info->chunk_root, fs_info,
1174 BTRFS_CHUNK_TREE_OBJECTID);
1176 ret = btrfs_read_sys_array(fs_info->chunk_root);
1180 generation = btrfs_super_chunk_root_generation(sb);
1182 if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1183 fs_info->sectorsize)) {
1184 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1185 chunk_root_bytenr, fs_info->sectorsize);
1186 chunk_root_bytenr = 0;
1189 if (!chunk_root_bytenr)
1190 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1194 fs_info->chunk_root->node = read_tree_block(fs_info,
1198 if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1199 if (fs_info->ignore_chunk_tree_error) {
1200 warning("cannot read chunk root, continue anyway");
1201 fs_info->chunk_root = NULL;
1204 error("cannot read chunk root");
1209 if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1210 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1212 fprintf(stderr, "Couldn't read chunk tree\n");
1219 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1221 u64 root_tree_bytenr,
1222 u64 chunk_root_bytenr,
1225 struct btrfs_fs_info *fs_info;
1226 struct btrfs_super_block *disk_super;
1227 struct btrfs_fs_devices *fs_devices = NULL;
1228 struct extent_buffer *eb;
1231 unsigned sbflags = SBREAD_DEFAULT;
1234 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1236 /* try to drop all the caches */
1237 if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1238 fprintf(stderr, "Warning, could not drop caches\n");
1240 fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1242 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1245 if (flags & OPEN_CTREE_RESTORE)
1246 fs_info->on_restoring = 1;
1247 if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1248 fs_info->suppress_check_block_errors = 1;
1249 if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1250 fs_info->ignore_fsid_mismatch = 1;
1251 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1252 fs_info->ignore_chunk_tree_error = 1;
1254 if ((flags & OPEN_CTREE_RECOVER_SUPER)
1255 && (flags & OPEN_CTREE_FS_PARTIAL)) {
1257 "cannot open a partially created filesystem for recovery");
1261 if (flags & OPEN_CTREE_FS_PARTIAL)
1262 sbflags = SBREAD_PARTIAL;
1264 ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1265 (flags & OPEN_CTREE_NO_DEVICES));
1269 fs_info->fs_devices = fs_devices;
1270 if (flags & OPEN_CTREE_WRITES)
1275 if (flags & OPEN_CTREE_EXCLUSIVE)
1278 ret = btrfs_open_devices(fs_devices, oflags);
1282 disk_super = fs_info->super_copy;
1283 if (flags & OPEN_CTREE_RECOVER_SUPER)
1284 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1285 sb_bytenr, SBREAD_RECOVER);
1287 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1290 printk("No valid btrfs found\n");
1294 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1295 !fs_info->ignore_fsid_mismatch) {
1296 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1300 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1301 fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
1302 fs_info->nodesize = btrfs_super_nodesize(disk_super);
1303 fs_info->stripesize = btrfs_super_stripesize(disk_super);
1305 ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
1309 ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1313 /* Chunk tree root is unable to read, return directly */
1314 if (!fs_info->chunk_root)
1317 eb = fs_info->chunk_root->node;
1318 read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1319 btrfs_header_chunk_tree_uuid(eb),
1322 ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1323 if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1324 !fs_info->ignore_chunk_tree_error)
1330 btrfs_release_all_roots(fs_info);
1331 btrfs_cleanup_all_caches(fs_info);
1333 btrfs_close_devices(fs_devices);
1335 btrfs_free_fs_info(fs_info);
1339 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1340 u64 sb_bytenr, u64 root_tree_bytenr,
1341 u64 chunk_root_bytenr,
1346 struct btrfs_fs_info *info;
1347 int oflags = O_RDWR;
1350 ret = stat(filename, &st);
1352 error("cannot stat '%s': %s", filename, strerror(errno));
1355 if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1356 error("not a regular file or block device: %s", filename);
1360 if (!(flags & OPEN_CTREE_WRITES))
1363 fp = open(filename, oflags);
1365 error("cannot open '%s': %s", filename, strerror(errno));
1368 info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1369 chunk_root_bytenr, flags);
1374 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1377 struct btrfs_fs_info *info;
1379 /* This flags may not return fs_info with any valid root */
1380 BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1381 info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1384 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1385 return info->chunk_root;
1386 return info->fs_root;
1389 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1392 struct btrfs_fs_info *info;
1394 /* This flags may not return fs_info with any valid root */
1395 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
1396 error("invalid open_ctree flags: 0x%llx",
1397 (unsigned long long)flags);
1400 info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1403 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1404 return info->chunk_root;
1405 return info->fs_root;
1409 * Check if the super is valid:
1410 * - nodesize/sectorsize - minimum, maximum, alignment
1411 * - tree block starts - alignment
1412 * - number of devices - something sane
1413 * - sys array size - maximum
1415 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1417 u8 result[BTRFS_CSUM_SIZE];
1422 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1423 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1424 if (!(sbflags & SBREAD_PARTIAL)) {
1425 error("superblock magic doesn't match");
1431 csum_type = btrfs_super_csum_type(sb);
1432 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1433 error("unsupported checksum algorithm %u", csum_type);
1436 csum_size = btrfs_csum_sizes[csum_type];
1439 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1440 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1441 btrfs_csum_final(crc, result);
1443 if (memcmp(result, sb->csum, csum_size)) {
1444 error("superblock checksum mismatch");
1447 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1448 error("tree_root level too big: %d >= %d",
1449 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1452 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1453 error("chunk_root level too big: %d >= %d",
1454 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1457 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1458 error("log_root level too big: %d >= %d",
1459 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1463 if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1464 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1467 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1468 error("chunk_root block unaligned: %llu",
1469 btrfs_super_chunk_root(sb));
1472 if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1473 error("log_root block unaligned: %llu",
1474 btrfs_super_log_root(sb));
1477 if (btrfs_super_nodesize(sb) < 4096) {
1478 error("nodesize too small: %u < 4096",
1479 btrfs_super_nodesize(sb));
1482 if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1483 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1486 if (btrfs_super_sectorsize(sb) < 4096) {
1487 error("sectorsize too small: %u < 4096",
1488 btrfs_super_sectorsize(sb));
1491 if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1492 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1495 if (btrfs_super_total_bytes(sb) == 0) {
1496 error("invalid total_bytes 0");
1499 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1500 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1503 if ((btrfs_super_stripesize(sb) != 4096)
1504 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1505 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1509 if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1510 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1511 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1513 uuid_unparse(sb->fsid, fsid);
1514 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1515 error("dev_item UUID does not match fsid: %s != %s",
1521 * Hint to catch really bogus numbers, bitflips or so
1523 if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1524 warning("suspicious number of devices: %llu",
1525 btrfs_super_num_devices(sb));
1528 if (btrfs_super_num_devices(sb) == 0) {
1529 error("number of devices is 0");
1534 * Obvious sys_chunk_array corruptions, it must hold at least one key
1537 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1538 error("system chunk array too big %u > %u",
1539 btrfs_super_sys_array_size(sb),
1540 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1543 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1544 + sizeof(struct btrfs_chunk)) {
1545 error("system chunk array too small %u < %zu",
1546 btrfs_super_sys_array_size(sb),
1547 sizeof(struct btrfs_disk_key) +
1548 sizeof(struct btrfs_chunk));
1555 error("superblock checksum matches but it has invalid members");
1559 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1562 u8 fsid[BTRFS_FSID_SIZE];
1563 int fsid_is_initialized = 0;
1564 char tmp[BTRFS_SUPER_INFO_SIZE];
1565 struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1568 int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1572 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1573 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1578 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1579 if (ret < BTRFS_SUPER_INFO_SIZE)
1582 if (btrfs_super_bytenr(buf) != sb_bytenr)
1585 ret = check_super(buf, sbflags);
1588 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1593 * we would like to check all the supers, but that would make
1594 * a btrfs mount succeed after a mkfs from a different FS.
1595 * So, we need to add a special mount option to scan for
1596 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1599 for (i = 0; i < max_super; i++) {
1600 bytenr = btrfs_sb_offset(i);
1601 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1602 if (ret < BTRFS_SUPER_INFO_SIZE)
1605 if (btrfs_super_bytenr(buf) != bytenr )
1607 /* if magic is NULL, the device was removed */
1608 if (btrfs_super_magic(buf) == 0 && i == 0)
1610 if (check_super(buf, sbflags))
1613 if (!fsid_is_initialized) {
1614 memcpy(fsid, buf->fsid, sizeof(fsid));
1615 fsid_is_initialized = 1;
1616 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1618 * the superblocks (the original one and
1619 * its backups) contain data of different
1620 * filesystems -> the super cannot be trusted
1625 if (btrfs_super_generation(buf) > transid) {
1626 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1627 transid = btrfs_super_generation(buf);
1631 return transid > 0 ? 0 : -1;
1634 static int write_dev_supers(struct btrfs_root *root,
1635 struct btrfs_super_block *sb,
1636 struct btrfs_device *device)
1642 if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1643 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1645 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1646 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1647 btrfs_csum_final(crc, &sb->csum[0]);
1650 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1651 * zero filled, we can use it directly
1653 ret = pwrite64(device->fd, root->fs_info->super_copy,
1654 BTRFS_SUPER_INFO_SIZE,
1655 root->fs_info->super_bytenr);
1656 if (ret != BTRFS_SUPER_INFO_SIZE)
1661 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1662 bytenr = btrfs_sb_offset(i);
1663 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1666 btrfs_set_super_bytenr(sb, bytenr);
1669 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1670 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1671 btrfs_csum_final(crc, &sb->csum[0]);
1674 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1675 * zero filled, we can use it directly
1677 ret = pwrite64(device->fd, root->fs_info->super_copy,
1678 BTRFS_SUPER_INFO_SIZE, bytenr);
1679 if (ret != BTRFS_SUPER_INFO_SIZE)
1687 fprintf(stderr, "WARNING: failed to write all sb data\n");
1689 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1694 int write_all_supers(struct btrfs_root *root)
1696 struct list_head *cur;
1697 struct list_head *head = &root->fs_info->fs_devices->devices;
1698 struct btrfs_device *dev;
1699 struct btrfs_super_block *sb;
1700 struct btrfs_dev_item *dev_item;
1704 sb = root->fs_info->super_copy;
1705 dev_item = &sb->dev_item;
1706 list_for_each(cur, head) {
1707 dev = list_entry(cur, struct btrfs_device, dev_list);
1708 if (!dev->writeable)
1711 btrfs_set_stack_device_generation(dev_item, 0);
1712 btrfs_set_stack_device_type(dev_item, dev->type);
1713 btrfs_set_stack_device_id(dev_item, dev->devid);
1714 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1715 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1716 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1717 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1718 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1719 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1720 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1722 flags = btrfs_super_flags(sb);
1723 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1725 ret = write_dev_supers(root, sb, dev);
1731 int write_ctree_super(struct btrfs_trans_handle *trans,
1732 struct btrfs_root *root)
1735 struct btrfs_root *tree_root = root->fs_info->tree_root;
1736 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1738 if (root->fs_info->readonly)
1741 btrfs_set_super_generation(root->fs_info->super_copy,
1743 btrfs_set_super_root(root->fs_info->super_copy,
1744 tree_root->node->start);
1745 btrfs_set_super_root_level(root->fs_info->super_copy,
1746 btrfs_header_level(tree_root->node));
1747 btrfs_set_super_chunk_root(root->fs_info->super_copy,
1748 chunk_root->node->start);
1749 btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1750 btrfs_header_level(chunk_root->node));
1751 btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1752 btrfs_header_generation(chunk_root->node));
1754 ret = write_all_supers(root);
1756 fprintf(stderr, "failed to write new super block err %d\n", ret);
1760 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1763 struct btrfs_trans_handle *trans;
1764 struct btrfs_root *root = fs_info->tree_root;
1766 if (fs_info->last_trans_committed !=
1767 fs_info->generation) {
1769 trans = btrfs_start_transaction(root, 1);
1770 btrfs_commit_transaction(trans, root);
1771 trans = btrfs_start_transaction(root, 1);
1772 ret = commit_tree_roots(trans, fs_info);
1774 ret = __commit_transaction(trans, root);
1776 write_ctree_super(trans, root);
1780 if (fs_info->finalize_on_close) {
1781 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1782 root->fs_info->finalize_on_close = 0;
1783 ret = write_all_supers(root);
1786 "failed to write new super block err %d\n", ret);
1788 btrfs_free_block_groups(fs_info);
1790 free_fs_roots_tree(&fs_info->fs_root_tree);
1792 btrfs_release_all_roots(fs_info);
1793 ret = btrfs_close_devices(fs_info->fs_devices);
1794 btrfs_cleanup_all_caches(fs_info);
1795 btrfs_free_fs_info(fs_info);
1799 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1800 struct extent_buffer *eb)
1802 return clear_extent_buffer_dirty(eb);
1805 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1807 set_extent_buffer_dirty(eb);
1810 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1814 ret = extent_buffer_uptodate(buf);
1818 ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1822 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1824 return set_extent_buffer_uptodate(eb);