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 = btrfs_super_nodesize(fs_info->super_copy);
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(struct btrfs_root *root, char *data, u32 seed, size_t len)
123 return crc32c(seed, data, len);
126 void btrfs_csum_final(u32 crc, char *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 char 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->mapping_tree, READ,
207 bytenr, &length, &multi, 0, NULL)) {
208 device = multi->stripes[0].dev;
210 blocksize = min(blocksize, (u32)(64 * 1024));
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(io_tree, 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->mapping_tree, READ,
266 eb->start + offset, &read_len, &multi,
269 printk("Couldn't map the block %Lu\n", eb->start + offset);
273 device = multi->stripes[0].dev;
275 if (device->fd <= 0) {
282 eb->dev_bytenr = multi->stripes[0].physical;
286 /* special case for restore metadump */
287 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
288 if (device->devid == 1)
293 eb->dev_bytenr = eb->start;
297 if (read_len > bytes_left)
298 read_len = bytes_left;
300 ret = read_extent_from_disk(eb, offset, read_len);
304 bytes_left -= read_len;
309 struct extent_buffer* read_tree_block_fs_info(
310 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
314 struct extent_buffer *eb;
315 u64 best_transid = 0;
321 eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
323 return ERR_PTR(-ENOMEM);
325 if (btrfs_buffer_uptodate(eb, parent_transid))
329 ret = read_whole_eb(fs_info, eb, mirror_num);
330 if (ret == 0 && csum_tree_block_fs_info(fs_info, eb, 1) == 0 &&
331 check_tree_block(fs_info, eb) == 0 &&
332 verify_parent_transid(eb->tree, eb, parent_transid, ignore)
334 if (eb->flags & EXTENT_BAD_TRANSID &&
335 list_empty(&eb->recow)) {
336 list_add_tail(&eb->recow,
337 &fs_info->recow_ebs);
340 btrfs_set_buffer_uptodate(eb);
344 if (check_tree_block(fs_info, eb)) {
345 if (!fs_info->suppress_check_block_errors)
346 print_tree_block_error(fs_info, eb,
347 check_tree_block(fs_info, eb));
349 if (!fs_info->suppress_check_block_errors)
350 fprintf(stderr, "Csum didn't match\n");
355 num_copies = btrfs_num_copies(&fs_info->mapping_tree,
357 if (num_copies == 1) {
361 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
362 best_transid = btrfs_header_generation(eb);
363 good_mirror = mirror_num;
366 if (mirror_num > num_copies) {
367 mirror_num = good_mirror;
372 free_extent_buffer(eb);
376 int read_extent_data(struct btrfs_root *root, char *data,
377 u64 logical, u64 *len, int mirror)
380 struct btrfs_multi_bio *multi = NULL;
381 struct btrfs_fs_info *info = root->fs_info;
382 struct btrfs_device *device;
386 ret = btrfs_map_block(&info->mapping_tree, READ, logical, len,
387 &multi, mirror, NULL);
389 fprintf(stderr, "Couldn't map the block %llu\n",
393 device = multi->stripes[0].dev;
400 ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
410 int write_and_map_eb(struct btrfs_trans_handle *trans,
411 struct btrfs_root *root,
412 struct extent_buffer *eb)
417 u64 *raid_map = NULL;
418 struct btrfs_multi_bio *multi = NULL;
422 ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
423 eb->start, &length, &multi, 0, &raid_map);
426 ret = write_raid56_with_parity(root->fs_info, eb, multi,
429 } else while (dev_nr < multi->num_stripes) {
431 eb->fd = multi->stripes[dev_nr].dev->fd;
432 eb->dev_bytenr = multi->stripes[dev_nr].physical;
433 multi->stripes[dev_nr].dev->total_ios++;
435 ret = write_extent_to_disk(eb);
443 int write_tree_block(struct btrfs_trans_handle *trans,
444 struct btrfs_root *root,
445 struct extent_buffer *eb)
447 if (check_tree_block(root->fs_info, eb)) {
448 print_tree_block_error(root->fs_info, eb,
449 check_tree_block(root->fs_info, eb));
453 if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
456 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
457 csum_tree_block(root, eb, 0);
459 return write_and_map_eb(trans, root, eb);
462 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
463 u32 stripesize, struct btrfs_root *root,
464 struct btrfs_fs_info *fs_info, u64 objectid)
467 root->commit_root = NULL;
468 root->sectorsize = sectorsize;
469 root->nodesize = nodesize;
470 root->leafsize = leafsize;
471 root->stripesize = stripesize;
473 root->track_dirty = 0;
475 root->fs_info = fs_info;
476 root->objectid = objectid;
477 root->last_trans = 0;
478 root->highest_inode = 0;
479 root->last_inode_alloc = 0;
481 INIT_LIST_HEAD(&root->dirty_list);
482 INIT_LIST_HEAD(&root->orphan_data_extents);
483 memset(&root->root_key, 0, sizeof(root->root_key));
484 memset(&root->root_item, 0, sizeof(root->root_item));
485 root->root_key.objectid = objectid;
489 static int update_cowonly_root(struct btrfs_trans_handle *trans,
490 struct btrfs_root *root)
494 struct btrfs_root *tree_root = root->fs_info->tree_root;
496 btrfs_write_dirty_block_groups(trans, root);
498 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
499 if (old_root_bytenr == root->node->start)
501 btrfs_set_root_bytenr(&root->root_item,
503 btrfs_set_root_generation(&root->root_item,
505 root->root_item.level = btrfs_header_level(root->node);
506 ret = btrfs_update_root(trans, tree_root,
510 btrfs_write_dirty_block_groups(trans, root);
515 static int commit_tree_roots(struct btrfs_trans_handle *trans,
516 struct btrfs_fs_info *fs_info)
518 struct btrfs_root *root;
519 struct list_head *next;
520 struct extent_buffer *eb;
523 if (fs_info->readonly)
526 eb = fs_info->tree_root->node;
527 extent_buffer_get(eb);
528 ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
529 free_extent_buffer(eb);
533 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
534 next = fs_info->dirty_cowonly_roots.next;
536 root = list_entry(next, struct btrfs_root, dirty_list);
537 update_cowonly_root(trans, root);
538 free_extent_buffer(root->commit_root);
539 root->commit_root = NULL;
545 static int __commit_transaction(struct btrfs_trans_handle *trans,
546 struct btrfs_root *root)
550 struct extent_buffer *eb;
551 struct extent_io_tree *tree = &root->fs_info->extent_cache;
555 ret = find_first_extent_bit(tree, 0, &start, &end,
559 while(start <= end) {
560 eb = find_first_extent_buffer(tree, start);
561 BUG_ON(!eb || eb->start != start);
562 ret = write_tree_block(trans, root, eb);
565 clear_extent_buffer_dirty(eb);
566 free_extent_buffer(eb);
572 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
573 struct btrfs_root *root)
575 u64 transid = trans->transid;
577 struct btrfs_fs_info *fs_info = root->fs_info;
579 if (root->commit_root == root->node)
581 if (root == root->fs_info->tree_root)
583 if (root == root->fs_info->chunk_root)
586 free_extent_buffer(root->commit_root);
587 root->commit_root = NULL;
589 btrfs_set_root_bytenr(&root->root_item, root->node->start);
590 btrfs_set_root_generation(&root->root_item, trans->transid);
591 root->root_item.level = btrfs_header_level(root->node);
592 ret = btrfs_update_root(trans, root->fs_info->tree_root,
593 &root->root_key, &root->root_item);
596 ret = commit_tree_roots(trans, fs_info);
598 ret = __commit_transaction(trans, root);
600 write_ctree_super(trans, root);
601 btrfs_finish_extent_commit(trans, fs_info->extent_root,
602 &fs_info->pinned_extents);
603 btrfs_free_transaction(root, trans);
604 free_extent_buffer(root->commit_root);
605 root->commit_root = NULL;
606 fs_info->running_transaction = NULL;
607 fs_info->last_trans_committed = transid;
611 static int find_and_setup_root(struct btrfs_root *tree_root,
612 struct btrfs_fs_info *fs_info,
613 u64 objectid, struct btrfs_root *root)
619 __setup_root(tree_root->nodesize, tree_root->leafsize,
620 tree_root->sectorsize, tree_root->stripesize,
621 root, fs_info, objectid);
622 ret = btrfs_find_last_root(tree_root, objectid,
623 &root->root_item, &root->root_key);
627 blocksize = root->nodesize;
628 generation = btrfs_root_generation(&root->root_item);
629 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
630 blocksize, generation);
631 if (!extent_buffer_uptodate(root->node))
637 static int find_and_setup_log_root(struct btrfs_root *tree_root,
638 struct btrfs_fs_info *fs_info,
639 struct btrfs_super_block *disk_super)
642 u64 blocknr = btrfs_super_log_root(disk_super);
643 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
653 blocksize = tree_root->nodesize;
655 __setup_root(tree_root->nodesize, tree_root->leafsize,
656 tree_root->sectorsize, tree_root->stripesize,
657 log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
659 log_root->node = read_tree_block(tree_root, 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 __setup_root(tree_root->nodesize, tree_root->leafsize,
720 tree_root->sectorsize, tree_root->stripesize,
721 root, fs_info, location->objectid);
723 path = btrfs_alloc_path();
725 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
732 read_extent_buffer(l, &root->root_item,
733 btrfs_item_ptr_offset(l, path->slots[0]),
734 sizeof(root->root_item));
735 memcpy(&root->root_key, location, sizeof(*location));
738 btrfs_free_path(path);
743 generation = btrfs_root_generation(&root->root_item);
744 blocksize = root->nodesize;
745 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
746 blocksize, generation);
747 if (!extent_buffer_uptodate(root->node)) {
749 return ERR_PTR(-EIO);
756 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
759 u64 objectid = *((u64 *)data);
760 struct btrfs_root *root;
762 root = rb_entry(node, struct btrfs_root, rb_node);
763 if (objectid > root->objectid)
765 else if (objectid < root->objectid)
771 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
772 struct rb_node *node2)
774 struct btrfs_root *root;
776 root = rb_entry(node2, struct btrfs_root, rb_node);
777 return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
780 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
781 struct btrfs_key *location)
783 struct btrfs_root *root;
784 struct rb_node *node;
786 u64 objectid = location->objectid;
788 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
789 return fs_info->tree_root;
790 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
791 return fs_info->extent_root;
792 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
793 return fs_info->chunk_root;
794 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
795 return fs_info->dev_root;
796 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
797 return fs_info->csum_root;
798 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
799 return fs_info->quota_root;
801 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
802 location->offset != (u64)-1);
804 node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
805 btrfs_fs_roots_compare_objectids, NULL);
807 return container_of(node, struct btrfs_root, rb_node);
809 root = btrfs_read_fs_root_no_cache(fs_info, location);
813 ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
814 btrfs_fs_roots_compare_roots);
819 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
821 free(fs_info->tree_root);
822 free(fs_info->extent_root);
823 free(fs_info->chunk_root);
824 free(fs_info->dev_root);
825 free(fs_info->csum_root);
826 free(fs_info->quota_root);
827 free(fs_info->free_space_root);
828 free(fs_info->super_copy);
829 free(fs_info->log_root_tree);
833 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
835 struct btrfs_fs_info *fs_info;
837 fs_info = calloc(1, sizeof(struct btrfs_fs_info));
841 fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
842 fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
843 fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
844 fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
845 fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
846 fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
847 fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
848 fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
850 if (!fs_info->tree_root || !fs_info->extent_root ||
851 !fs_info->chunk_root || !fs_info->dev_root ||
852 !fs_info->csum_root || !fs_info->quota_root ||
853 !fs_info->free_space_root || !fs_info->super_copy)
856 extent_io_tree_init(&fs_info->extent_cache);
857 extent_io_tree_init(&fs_info->free_space_cache);
858 extent_io_tree_init(&fs_info->block_group_cache);
859 extent_io_tree_init(&fs_info->pinned_extents);
860 extent_io_tree_init(&fs_info->pending_del);
861 extent_io_tree_init(&fs_info->extent_ins);
862 fs_info->excluded_extents = NULL;
864 fs_info->fs_root_tree = RB_ROOT;
865 cache_tree_init(&fs_info->mapping_tree.cache_tree);
867 mutex_init(&fs_info->fs_mutex);
868 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
869 INIT_LIST_HEAD(&fs_info->space_info);
870 INIT_LIST_HEAD(&fs_info->recow_ebs);
873 fs_info->readonly = 1;
875 fs_info->super_bytenr = sb_bytenr;
876 fs_info->data_alloc_profile = (u64)-1;
877 fs_info->metadata_alloc_profile = (u64)-1;
878 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
881 btrfs_free_fs_info(fs_info);
885 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
889 features = btrfs_super_incompat_flags(sb) &
890 ~BTRFS_FEATURE_INCOMPAT_SUPP;
892 printk("couldn't open because of unsupported "
893 "option features (%Lx).\n",
894 (unsigned long long)features);
898 features = btrfs_super_incompat_flags(sb);
899 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
900 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
901 btrfs_set_super_incompat_flags(sb, features);
904 features = btrfs_super_compat_ro_flags(sb) &
905 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
906 if (writable && features) {
907 printk("couldn't open RDWR because of unsupported "
908 "option features (%Lx).\n",
909 (unsigned long long)features);
915 static int find_best_backup_root(struct btrfs_super_block *super)
917 struct btrfs_root_backup *backup;
918 u64 orig_gen = btrfs_super_generation(super);
923 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
924 backup = super->super_roots + i;
925 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
926 btrfs_backup_tree_root_gen(backup) > gen) {
928 gen = btrfs_backup_tree_root_gen(backup);
934 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
935 enum btrfs_open_ctree_flags flags,
936 struct btrfs_root *info_root,
937 u64 objectid, char *str)
939 struct btrfs_super_block *sb = fs_info->super_copy;
940 struct btrfs_root *root = fs_info->tree_root;
941 u32 nodesize = btrfs_super_nodesize(sb);
944 ret = find_and_setup_root(root, fs_info, objectid, info_root);
946 printk("Couldn't setup %s tree\n", str);
947 if (!(flags & OPEN_CTREE_PARTIAL))
950 * Need a blank node here just so we don't screw up in the
951 * million of places that assume a root has a valid ->node
954 btrfs_find_create_tree_block(fs_info, 0, nodesize);
955 if (!info_root->node)
957 clear_extent_buffer_uptodate(NULL, info_root->node);
963 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
964 enum btrfs_open_ctree_flags flags)
966 struct btrfs_super_block *sb = fs_info->super_copy;
967 struct btrfs_root *root;
968 struct btrfs_key key;
977 nodesize = btrfs_super_nodesize(sb);
978 leafsize = btrfs_super_leafsize(sb);
979 sectorsize = btrfs_super_sectorsize(sb);
980 stripesize = btrfs_super_stripesize(sb);
982 root = fs_info->tree_root;
983 __setup_root(nodesize, leafsize, sectorsize, stripesize,
984 root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
985 blocksize = root->nodesize;
986 generation = btrfs_super_generation(sb);
988 if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
989 root_tree_bytenr = btrfs_super_root(sb);
990 } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
991 struct btrfs_root_backup *backup;
992 int index = find_best_backup_root(sb);
993 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
994 fprintf(stderr, "Invalid backup root number\n");
997 backup = fs_info->super_copy->super_roots + index;
998 root_tree_bytenr = btrfs_backup_tree_root(backup);
999 generation = btrfs_backup_tree_root_gen(backup);
1002 root->node = read_tree_block(root, root_tree_bytenr, blocksize,
1004 if (!extent_buffer_uptodate(root->node)) {
1005 fprintf(stderr, "Couldn't read tree root\n");
1009 ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
1010 BTRFS_EXTENT_TREE_OBJECTID, "extent");
1013 fs_info->extent_root->track_dirty = 1;
1015 ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1018 printk("Couldn't setup device tree\n");
1021 fs_info->dev_root->track_dirty = 1;
1023 ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1024 BTRFS_CSUM_TREE_OBJECTID, "csum");
1027 fs_info->csum_root->track_dirty = 1;
1029 ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1030 fs_info->quota_root);
1032 fs_info->quota_enabled = 1;
1034 if (btrfs_fs_compat_ro(fs_info, BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE)) {
1035 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1036 fs_info->free_space_root);
1038 printk("Couldn't read free space tree\n");
1041 fs_info->free_space_root->track_dirty = 1;
1044 ret = find_and_setup_log_root(root, fs_info, sb);
1046 printk("Couldn't setup log root tree\n");
1047 if (!(flags & OPEN_CTREE_PARTIAL))
1051 fs_info->generation = generation;
1052 fs_info->last_trans_committed = generation;
1053 if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1054 !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1055 btrfs_read_block_groups(fs_info->tree_root);
1057 key.objectid = BTRFS_FS_TREE_OBJECTID;
1058 key.type = BTRFS_ROOT_ITEM_KEY;
1059 key.offset = (u64)-1;
1060 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1062 if (IS_ERR(fs_info->fs_root))
1067 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1069 if (fs_info->free_space_root)
1070 free_extent_buffer(fs_info->free_space_root->node);
1071 if (fs_info->quota_root)
1072 free_extent_buffer(fs_info->quota_root->node);
1073 if (fs_info->csum_root)
1074 free_extent_buffer(fs_info->csum_root->node);
1075 if (fs_info->dev_root)
1076 free_extent_buffer(fs_info->dev_root->node);
1077 if (fs_info->extent_root)
1078 free_extent_buffer(fs_info->extent_root->node);
1079 if (fs_info->tree_root)
1080 free_extent_buffer(fs_info->tree_root->node);
1081 if (fs_info->log_root_tree)
1082 free_extent_buffer(fs_info->log_root_tree->node);
1083 if (fs_info->chunk_root)
1084 free_extent_buffer(fs_info->chunk_root->node);
1087 static void free_map_lookup(struct cache_extent *ce)
1089 struct map_lookup *map;
1091 map = container_of(ce, struct map_lookup, ce);
1095 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1097 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1099 while (!list_empty(&fs_info->recow_ebs)) {
1100 struct extent_buffer *eb;
1101 eb = list_first_entry(&fs_info->recow_ebs,
1102 struct extent_buffer, recow);
1103 list_del_init(&eb->recow);
1104 free_extent_buffer(eb);
1106 free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1107 extent_io_tree_cleanup(&fs_info->extent_cache);
1108 extent_io_tree_cleanup(&fs_info->free_space_cache);
1109 extent_io_tree_cleanup(&fs_info->block_group_cache);
1110 extent_io_tree_cleanup(&fs_info->pinned_extents);
1111 extent_io_tree_cleanup(&fs_info->pending_del);
1112 extent_io_tree_cleanup(&fs_info->extent_ins);
1115 int btrfs_scan_fs_devices(int fd, const char *path,
1116 struct btrfs_fs_devices **fs_devices,
1117 u64 sb_bytenr, int super_recover,
1125 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1127 seek_ret = lseek(fd, 0, SEEK_END);
1131 dev_size = seek_ret;
1132 lseek(fd, 0, SEEK_SET);
1133 if (sb_bytenr > dev_size) {
1134 fprintf(stderr, "Superblock bytenr is larger than device size\n");
1138 ret = btrfs_scan_one_device(fd, path, fs_devices,
1139 &total_devs, sb_bytenr, super_recover);
1141 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1145 if (!skip_devices && total_devs != 1) {
1146 ret = btrfs_scan_lblkid();
1153 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1154 u64 chunk_root_bytenr)
1156 struct btrfs_super_block *sb = fs_info->super_copy;
1165 nodesize = btrfs_super_nodesize(sb);
1166 leafsize = btrfs_super_leafsize(sb);
1167 sectorsize = btrfs_super_sectorsize(sb);
1168 stripesize = btrfs_super_stripesize(sb);
1170 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1171 fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1173 ret = btrfs_read_sys_array(fs_info->chunk_root);
1177 blocksize = fs_info->chunk_root->nodesize;
1178 generation = btrfs_super_chunk_root_generation(sb);
1180 if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1181 btrfs_super_sectorsize(sb))) {
1182 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1183 chunk_root_bytenr, btrfs_super_sectorsize(sb));
1184 chunk_root_bytenr = 0;
1187 if (!chunk_root_bytenr)
1188 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1192 fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
1194 blocksize, generation);
1195 if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1196 if (fs_info->ignore_chunk_tree_error) {
1197 warning("cannot read chunk root, continue anyway");
1198 fs_info->chunk_root = NULL;
1201 error("cannot read chunk root");
1206 if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1207 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1209 fprintf(stderr, "Couldn't read chunk tree\n");
1216 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1218 u64 root_tree_bytenr,
1219 u64 chunk_root_bytenr,
1220 enum btrfs_open_ctree_flags flags)
1222 struct btrfs_fs_info *fs_info;
1223 struct btrfs_super_block *disk_super;
1224 struct btrfs_fs_devices *fs_devices = NULL;
1225 struct extent_buffer *eb;
1230 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1232 /* try to drop all the caches */
1233 if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1234 fprintf(stderr, "Warning, could not drop caches\n");
1236 fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1238 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1241 if (flags & OPEN_CTREE_RESTORE)
1242 fs_info->on_restoring = 1;
1243 if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1244 fs_info->suppress_check_block_errors = 1;
1245 if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1246 fs_info->ignore_fsid_mismatch = 1;
1247 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1248 fs_info->ignore_chunk_tree_error = 1;
1250 ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr,
1251 (flags & OPEN_CTREE_RECOVER_SUPER),
1252 (flags & OPEN_CTREE_NO_DEVICES));
1256 fs_info->fs_devices = fs_devices;
1257 if (flags & OPEN_CTREE_WRITES)
1262 if (flags & OPEN_CTREE_EXCLUSIVE)
1265 ret = btrfs_open_devices(fs_devices, oflags);
1269 disk_super = fs_info->super_copy;
1270 if (flags & OPEN_CTREE_RECOVER_SUPER)
1271 ret = btrfs_read_dev_super(fs_devices->latest_bdev,
1272 disk_super, sb_bytenr, 1);
1274 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr, 0);
1276 printk("No valid btrfs found\n");
1280 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1281 !fs_info->ignore_fsid_mismatch) {
1282 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1286 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1288 ret = btrfs_check_fs_compatibility(fs_info->super_copy,
1289 flags & OPEN_CTREE_WRITES);
1293 ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1297 /* Chunk tree root is unable to read, return directly */
1298 if (!fs_info->chunk_root)
1301 eb = fs_info->chunk_root->node;
1302 read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1303 btrfs_header_chunk_tree_uuid(eb),
1306 ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1307 if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1308 !fs_info->ignore_chunk_tree_error)
1314 btrfs_release_all_roots(fs_info);
1315 btrfs_cleanup_all_caches(fs_info);
1317 btrfs_close_devices(fs_devices);
1319 btrfs_free_fs_info(fs_info);
1323 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1324 u64 sb_bytenr, u64 root_tree_bytenr,
1325 u64 chunk_root_bytenr,
1326 enum btrfs_open_ctree_flags flags)
1330 struct btrfs_fs_info *info;
1331 int oflags = O_RDWR;
1334 ret = stat(filename, &st);
1336 error("cannot stat '%s': %s", filename, strerror(errno));
1339 if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1340 error("not a regular file or block device: %s", filename);
1344 if (!(flags & OPEN_CTREE_WRITES))
1347 fp = open(filename, oflags);
1349 error("cannot open '%s': %s", filename, strerror(errno));
1352 info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1353 chunk_root_bytenr, flags);
1358 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1359 enum btrfs_open_ctree_flags flags)
1361 struct btrfs_fs_info *info;
1363 /* This flags may not return fs_info with any valid root */
1364 BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1365 info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1368 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1369 return info->chunk_root;
1370 return info->fs_root;
1373 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1374 enum btrfs_open_ctree_flags flags)
1376 struct btrfs_fs_info *info;
1378 /* This flags may not return fs_info with any valid root */
1379 BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1380 info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1383 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1384 return info->chunk_root;
1385 return info->fs_root;
1389 * Check if the super is valid:
1390 * - nodesize/sectorsize - minimum, maximum, alignment
1391 * - tree block starts - alignment
1392 * - number of devices - something sane
1393 * - sys array size - maximum
1395 static int check_super(struct btrfs_super_block *sb)
1397 char result[BTRFS_CSUM_SIZE];
1402 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1403 error("superblock magic doesn't match");
1407 csum_type = btrfs_super_csum_type(sb);
1408 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1409 error("unsupported checksum algorithm %u\n", csum_type);
1412 csum_size = btrfs_csum_sizes[csum_type];
1415 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1416 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1417 btrfs_csum_final(crc, result);
1419 if (memcmp(result, sb->csum, csum_size)) {
1420 error("superblock checksum mismatch");
1423 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1424 error("tree_root level too big: %d >= %d",
1425 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1428 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1429 error("chunk_root level too big: %d >= %d",
1430 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1433 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1434 error("log_root level too big: %d >= %d",
1435 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1439 if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1440 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1443 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1444 error("chunk_root block unaligned: %llu",
1445 btrfs_super_chunk_root(sb));
1448 if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1449 error("log_root block unaligned: %llu",
1450 btrfs_super_log_root(sb));
1453 if (btrfs_super_nodesize(sb) < 4096) {
1454 error("nodesize too small: %u < 4096",
1455 btrfs_super_nodesize(sb));
1458 if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1459 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1462 if (btrfs_super_sectorsize(sb) < 4096) {
1463 error("sectorsize too small: %u < 4096",
1464 btrfs_super_sectorsize(sb));
1467 if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1468 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1471 if (btrfs_super_total_bytes(sb) == 0) {
1472 error("invalid total_bytes 0");
1475 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1476 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1479 if ((btrfs_super_stripesize(sb) != 4096)
1480 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1481 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1485 if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1486 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1487 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1489 uuid_unparse(sb->fsid, fsid);
1490 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1491 error("dev_item UUID does not match fsid: %s != %s",
1497 * Hint to catch really bogus numbers, bitflips or so
1499 if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1500 warning("suspicious number of devices: %llu",
1501 btrfs_super_num_devices(sb));
1504 if (btrfs_super_num_devices(sb) == 0) {
1505 error("number of devices is 0");
1510 * Obvious sys_chunk_array corruptions, it must hold at least one key
1513 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1514 error("system chunk array too big %u > %u",
1515 btrfs_super_sys_array_size(sb),
1516 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1519 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1520 + sizeof(struct btrfs_chunk)) {
1521 error("system chunk array too small %u < %lu",
1522 btrfs_super_sys_array_size(sb),
1523 sizeof(struct btrfs_disk_key) +
1524 sizeof(struct btrfs_chunk));
1531 error("superblock checksum matches but it has invalid members");
1535 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1538 u8 fsid[BTRFS_FSID_SIZE];
1539 int fsid_is_initialized = 0;
1540 char tmp[BTRFS_SUPER_INFO_SIZE];
1541 struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1544 int max_super = super_recover ? BTRFS_SUPER_MIRROR_MAX : 1;
1548 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1549 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1550 if (ret < BTRFS_SUPER_INFO_SIZE)
1553 if (btrfs_super_bytenr(buf) != sb_bytenr)
1556 if (check_super(buf))
1558 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1563 * we would like to check all the supers, but that would make
1564 * a btrfs mount succeed after a mkfs from a different FS.
1565 * So, we need to add a special mount option to scan for
1566 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1569 for (i = 0; i < max_super; i++) {
1570 bytenr = btrfs_sb_offset(i);
1571 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1572 if (ret < BTRFS_SUPER_INFO_SIZE)
1575 if (btrfs_super_bytenr(buf) != bytenr )
1577 /* if magic is NULL, the device was removed */
1578 if (btrfs_super_magic(buf) == 0 && i == 0)
1580 if (check_super(buf))
1583 if (!fsid_is_initialized) {
1584 memcpy(fsid, buf->fsid, sizeof(fsid));
1585 fsid_is_initialized = 1;
1586 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1588 * the superblocks (the original one and
1589 * its backups) contain data of different
1590 * filesystems -> the super cannot be trusted
1595 if (btrfs_super_generation(buf) > transid) {
1596 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1597 transid = btrfs_super_generation(buf);
1601 return transid > 0 ? 0 : -1;
1604 static int write_dev_supers(struct btrfs_root *root,
1605 struct btrfs_super_block *sb,
1606 struct btrfs_device *device)
1612 if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1613 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1615 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1616 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1617 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1620 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1621 * zero filled, we can use it directly
1623 ret = pwrite64(device->fd, root->fs_info->super_copy,
1624 BTRFS_SUPER_INFO_SIZE,
1625 root->fs_info->super_bytenr);
1626 if (ret != BTRFS_SUPER_INFO_SIZE)
1631 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1632 bytenr = btrfs_sb_offset(i);
1633 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1636 btrfs_set_super_bytenr(sb, bytenr);
1639 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1640 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1641 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1644 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1645 * zero filled, we can use it directly
1647 ret = pwrite64(device->fd, root->fs_info->super_copy,
1648 BTRFS_SUPER_INFO_SIZE, bytenr);
1649 if (ret != BTRFS_SUPER_INFO_SIZE)
1657 fprintf(stderr, "WARNING: failed to write all sb data\n");
1659 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1664 int write_all_supers(struct btrfs_root *root)
1666 struct list_head *cur;
1667 struct list_head *head = &root->fs_info->fs_devices->devices;
1668 struct btrfs_device *dev;
1669 struct btrfs_super_block *sb;
1670 struct btrfs_dev_item *dev_item;
1674 sb = root->fs_info->super_copy;
1675 dev_item = &sb->dev_item;
1676 list_for_each(cur, head) {
1677 dev = list_entry(cur, struct btrfs_device, dev_list);
1678 if (!dev->writeable)
1681 btrfs_set_stack_device_generation(dev_item, 0);
1682 btrfs_set_stack_device_type(dev_item, dev->type);
1683 btrfs_set_stack_device_id(dev_item, dev->devid);
1684 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1685 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1686 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1687 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1688 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1689 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1690 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1692 flags = btrfs_super_flags(sb);
1693 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1695 ret = write_dev_supers(root, sb, dev);
1701 int write_ctree_super(struct btrfs_trans_handle *trans,
1702 struct btrfs_root *root)
1705 struct btrfs_root *tree_root = root->fs_info->tree_root;
1706 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1708 if (root->fs_info->readonly)
1711 btrfs_set_super_generation(root->fs_info->super_copy,
1713 btrfs_set_super_root(root->fs_info->super_copy,
1714 tree_root->node->start);
1715 btrfs_set_super_root_level(root->fs_info->super_copy,
1716 btrfs_header_level(tree_root->node));
1717 btrfs_set_super_chunk_root(root->fs_info->super_copy,
1718 chunk_root->node->start);
1719 btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1720 btrfs_header_level(chunk_root->node));
1721 btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1722 btrfs_header_generation(chunk_root->node));
1724 ret = write_all_supers(root);
1726 fprintf(stderr, "failed to write new super block err %d\n", ret);
1730 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1733 struct btrfs_trans_handle *trans;
1734 struct btrfs_root *root = fs_info->tree_root;
1736 if (fs_info->last_trans_committed !=
1737 fs_info->generation) {
1739 trans = btrfs_start_transaction(root, 1);
1740 btrfs_commit_transaction(trans, root);
1741 trans = btrfs_start_transaction(root, 1);
1742 ret = commit_tree_roots(trans, fs_info);
1744 ret = __commit_transaction(trans, root);
1746 write_ctree_super(trans, root);
1747 btrfs_free_transaction(root, trans);
1749 btrfs_free_block_groups(fs_info);
1751 free_fs_roots_tree(&fs_info->fs_root_tree);
1753 btrfs_release_all_roots(fs_info);
1754 btrfs_close_devices(fs_info->fs_devices);
1755 btrfs_cleanup_all_caches(fs_info);
1756 btrfs_free_fs_info(fs_info);
1760 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1761 struct extent_buffer *eb)
1763 return clear_extent_buffer_dirty(eb);
1766 int wait_on_tree_block_writeback(struct btrfs_root *root,
1767 struct extent_buffer *eb)
1772 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1774 set_extent_buffer_dirty(eb);
1777 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1781 ret = extent_buffer_uptodate(buf);
1785 ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1789 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1791 return set_extent_buffer_uptodate(eb);