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->mapping_tree, READ,
207 bytenr, &length, &multi, 0, NULL)) {
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->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(
310 struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
314 struct extent_buffer *eb;
315 u64 best_transid = 0;
316 u32 sectorsize = fs_info->sectorsize;
317 u32 nodesize = fs_info->nodesize;
324 * Don't even try to create tree block for unaligned tree block
326 * Such unaligned tree block will free overlapping extent buffer,
327 * causing use-after-free bugs for fuzzed images.
329 if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
330 error("tree block bytenr %llu is not aligned to sectorsize %u",
332 return ERR_PTR(-EIO);
334 if (blocksize < nodesize || !IS_ALIGNED(blocksize, nodesize)) {
335 error("tree block size %u is not aligned to nodesize %u",
336 blocksize, nodesize);
337 return ERR_PTR(-EIO);
340 eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
342 return ERR_PTR(-ENOMEM);
344 if (btrfs_buffer_uptodate(eb, parent_transid))
348 ret = read_whole_eb(fs_info, eb, mirror_num);
349 if (ret == 0 && csum_tree_block_fs_info(fs_info, eb, 1) == 0 &&
350 check_tree_block(fs_info, eb) == 0 &&
351 verify_parent_transid(eb->tree, eb, parent_transid, ignore)
353 if (eb->flags & EXTENT_BAD_TRANSID &&
354 list_empty(&eb->recow)) {
355 list_add_tail(&eb->recow,
356 &fs_info->recow_ebs);
359 btrfs_set_buffer_uptodate(eb);
363 if (check_tree_block(fs_info, eb)) {
364 if (!fs_info->suppress_check_block_errors)
365 print_tree_block_error(fs_info, eb,
366 check_tree_block(fs_info, eb));
368 if (!fs_info->suppress_check_block_errors)
369 fprintf(stderr, "Csum didn't match\n");
374 num_copies = btrfs_num_copies(&fs_info->mapping_tree,
376 if (num_copies == 1) {
380 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
381 best_transid = btrfs_header_generation(eb);
382 good_mirror = mirror_num;
385 if (mirror_num > num_copies) {
386 mirror_num = good_mirror;
391 free_extent_buffer(eb);
395 int read_extent_data(struct btrfs_root *root, char *data,
396 u64 logical, u64 *len, int mirror)
399 struct btrfs_multi_bio *multi = NULL;
400 struct btrfs_fs_info *info = root->fs_info;
401 struct btrfs_device *device;
405 ret = btrfs_map_block(&info->mapping_tree, READ, logical, len,
406 &multi, mirror, NULL);
408 fprintf(stderr, "Couldn't map the block %llu\n",
412 device = multi->stripes[0].dev;
419 ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
429 int write_and_map_eb(struct btrfs_root *root, struct extent_buffer *eb)
434 u64 *raid_map = NULL;
435 struct btrfs_multi_bio *multi = NULL;
439 ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
440 eb->start, &length, &multi, 0, &raid_map);
443 ret = write_raid56_with_parity(root->fs_info, eb, multi,
446 } else while (dev_nr < multi->num_stripes) {
448 eb->fd = multi->stripes[dev_nr].dev->fd;
449 eb->dev_bytenr = multi->stripes[dev_nr].physical;
450 multi->stripes[dev_nr].dev->total_ios++;
452 ret = write_extent_to_disk(eb);
460 int write_tree_block(struct btrfs_trans_handle *trans,
461 struct btrfs_root *root,
462 struct extent_buffer *eb)
464 if (check_tree_block(root->fs_info, eb)) {
465 print_tree_block_error(root->fs_info, eb,
466 check_tree_block(root->fs_info, eb));
470 if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
473 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
474 csum_tree_block(root, eb, 0);
476 return write_and_map_eb(root, eb);
479 void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
483 root->commit_root = NULL;
485 root->track_dirty = 0;
487 root->fs_info = fs_info;
488 root->objectid = objectid;
489 root->last_trans = 0;
490 root->last_inode_alloc = 0;
492 INIT_LIST_HEAD(&root->dirty_list);
493 INIT_LIST_HEAD(&root->orphan_data_extents);
494 memset(&root->root_key, 0, sizeof(root->root_key));
495 memset(&root->root_item, 0, sizeof(root->root_item));
496 root->root_key.objectid = objectid;
499 static int update_cowonly_root(struct btrfs_trans_handle *trans,
500 struct btrfs_root *root)
504 struct btrfs_root *tree_root = root->fs_info->tree_root;
506 btrfs_write_dirty_block_groups(trans, root);
508 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
509 if (old_root_bytenr == root->node->start)
511 btrfs_set_root_bytenr(&root->root_item,
513 btrfs_set_root_generation(&root->root_item,
515 root->root_item.level = btrfs_header_level(root->node);
516 ret = btrfs_update_root(trans, tree_root,
520 btrfs_write_dirty_block_groups(trans, root);
525 static int commit_tree_roots(struct btrfs_trans_handle *trans,
526 struct btrfs_fs_info *fs_info)
528 struct btrfs_root *root;
529 struct list_head *next;
530 struct extent_buffer *eb;
533 if (fs_info->readonly)
536 eb = fs_info->tree_root->node;
537 extent_buffer_get(eb);
538 ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
539 free_extent_buffer(eb);
543 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
544 next = fs_info->dirty_cowonly_roots.next;
546 root = list_entry(next, struct btrfs_root, dirty_list);
547 update_cowonly_root(trans, root);
548 free_extent_buffer(root->commit_root);
549 root->commit_root = NULL;
555 static int __commit_transaction(struct btrfs_trans_handle *trans,
556 struct btrfs_root *root)
560 struct extent_buffer *eb;
561 struct extent_io_tree *tree = &root->fs_info->extent_cache;
565 ret = find_first_extent_bit(tree, 0, &start, &end,
569 while(start <= end) {
570 eb = find_first_extent_buffer(tree, start);
571 BUG_ON(!eb || eb->start != start);
572 ret = write_tree_block(trans, root, eb);
575 clear_extent_buffer_dirty(eb);
576 free_extent_buffer(eb);
582 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
583 struct btrfs_root *root)
585 u64 transid = trans->transid;
587 struct btrfs_fs_info *fs_info = root->fs_info;
589 if (root->commit_root == root->node)
591 if (root == root->fs_info->tree_root)
593 if (root == root->fs_info->chunk_root)
596 free_extent_buffer(root->commit_root);
597 root->commit_root = NULL;
599 btrfs_set_root_bytenr(&root->root_item, root->node->start);
600 btrfs_set_root_generation(&root->root_item, trans->transid);
601 root->root_item.level = btrfs_header_level(root->node);
602 ret = btrfs_update_root(trans, root->fs_info->tree_root,
603 &root->root_key, &root->root_item);
606 ret = commit_tree_roots(trans, fs_info);
608 ret = __commit_transaction(trans, root);
610 write_ctree_super(trans, root);
611 btrfs_finish_extent_commit(trans, fs_info->extent_root,
612 &fs_info->pinned_extents);
614 free_extent_buffer(root->commit_root);
615 root->commit_root = NULL;
616 fs_info->running_transaction = NULL;
617 fs_info->last_trans_committed = transid;
621 static int find_and_setup_root(struct btrfs_root *tree_root,
622 struct btrfs_fs_info *fs_info,
623 u64 objectid, struct btrfs_root *root)
629 btrfs_setup_root(root, fs_info, objectid);
630 ret = btrfs_find_last_root(tree_root, objectid,
631 &root->root_item, &root->root_key);
635 blocksize = fs_info->nodesize;
636 generation = btrfs_root_generation(&root->root_item);
637 root->node = read_tree_block(fs_info,
638 btrfs_root_bytenr(&root->root_item),
639 blocksize, generation);
640 if (!extent_buffer_uptodate(root->node))
646 static int find_and_setup_log_root(struct btrfs_root *tree_root,
647 struct btrfs_fs_info *fs_info,
648 struct btrfs_super_block *disk_super)
651 u64 blocknr = btrfs_super_log_root(disk_super);
652 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
662 blocksize = fs_info->nodesize;
664 btrfs_setup_root(log_root, fs_info,
665 BTRFS_TREE_LOG_OBJECTID);
667 log_root->node = read_tree_block(fs_info, blocknr,
669 btrfs_super_generation(disk_super) + 1);
671 fs_info->log_root_tree = log_root;
673 if (!extent_buffer_uptodate(log_root->node)) {
674 free_extent_buffer(log_root->node);
676 fs_info->log_root_tree = NULL;
683 int btrfs_free_fs_root(struct btrfs_root *root)
686 free_extent_buffer(root->node);
687 if (root->commit_root)
688 free_extent_buffer(root->commit_root);
693 static void __free_fs_root(struct rb_node *node)
695 struct btrfs_root *root;
697 root = container_of(node, struct btrfs_root, rb_node);
698 btrfs_free_fs_root(root);
701 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
703 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
704 struct btrfs_key *location)
706 struct btrfs_root *root;
707 struct btrfs_root *tree_root = fs_info->tree_root;
708 struct btrfs_path *path;
709 struct extent_buffer *l;
714 root = calloc(1, sizeof(*root));
716 return ERR_PTR(-ENOMEM);
717 if (location->offset == (u64)-1) {
718 ret = find_and_setup_root(tree_root, fs_info,
719 location->objectid, root);
727 btrfs_setup_root(root, fs_info,
730 path = btrfs_alloc_path();
733 return ERR_PTR(-ENOMEM);
736 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
743 read_extent_buffer(l, &root->root_item,
744 btrfs_item_ptr_offset(l, path->slots[0]),
745 sizeof(root->root_item));
746 memcpy(&root->root_key, location, sizeof(*location));
749 btrfs_free_path(path);
754 generation = btrfs_root_generation(&root->root_item);
755 blocksize = fs_info->nodesize;
756 root->node = read_tree_block(fs_info,
757 btrfs_root_bytenr(&root->root_item),
758 blocksize, generation);
759 if (!extent_buffer_uptodate(root->node)) {
761 return ERR_PTR(-EIO);
768 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
771 u64 objectid = *((u64 *)data);
772 struct btrfs_root *root;
774 root = rb_entry(node, struct btrfs_root, rb_node);
775 if (objectid > root->objectid)
777 else if (objectid < root->objectid)
783 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
784 struct rb_node *node2)
786 struct btrfs_root *root;
788 root = rb_entry(node2, struct btrfs_root, rb_node);
789 return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
792 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
793 struct btrfs_key *location)
795 struct btrfs_root *root;
796 struct rb_node *node;
798 u64 objectid = location->objectid;
800 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
801 return fs_info->tree_root;
802 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
803 return fs_info->extent_root;
804 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
805 return fs_info->chunk_root;
806 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
807 return fs_info->dev_root;
808 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
809 return fs_info->csum_root;
810 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
811 return fs_info->quota_enabled ? fs_info->quota_root :
814 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
815 location->offset != (u64)-1);
817 node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
818 btrfs_fs_roots_compare_objectids, NULL);
820 return container_of(node, struct btrfs_root, rb_node);
822 root = btrfs_read_fs_root_no_cache(fs_info, location);
826 ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
827 btrfs_fs_roots_compare_roots);
832 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
834 if (fs_info->quota_root)
835 free(fs_info->quota_root);
837 free(fs_info->tree_root);
838 free(fs_info->extent_root);
839 free(fs_info->chunk_root);
840 free(fs_info->dev_root);
841 free(fs_info->csum_root);
842 free(fs_info->free_space_root);
843 free(fs_info->super_copy);
844 free(fs_info->log_root_tree);
848 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
850 struct btrfs_fs_info *fs_info;
852 fs_info = calloc(1, sizeof(struct btrfs_fs_info));
856 fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
857 fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
858 fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
859 fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
860 fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
861 fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
862 fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
863 fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
865 if (!fs_info->tree_root || !fs_info->extent_root ||
866 !fs_info->chunk_root || !fs_info->dev_root ||
867 !fs_info->csum_root || !fs_info->quota_root ||
868 !fs_info->free_space_root || !fs_info->super_copy)
871 extent_io_tree_init(&fs_info->extent_cache);
872 extent_io_tree_init(&fs_info->free_space_cache);
873 extent_io_tree_init(&fs_info->block_group_cache);
874 extent_io_tree_init(&fs_info->pinned_extents);
875 extent_io_tree_init(&fs_info->pending_del);
876 extent_io_tree_init(&fs_info->extent_ins);
877 fs_info->excluded_extents = NULL;
879 fs_info->fs_root_tree = RB_ROOT;
880 cache_tree_init(&fs_info->mapping_tree.cache_tree);
882 mutex_init(&fs_info->fs_mutex);
883 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
884 INIT_LIST_HEAD(&fs_info->space_info);
885 INIT_LIST_HEAD(&fs_info->recow_ebs);
888 fs_info->readonly = 1;
890 fs_info->super_bytenr = sb_bytenr;
891 fs_info->data_alloc_profile = (u64)-1;
892 fs_info->metadata_alloc_profile = (u64)-1;
893 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
896 btrfs_free_fs_info(fs_info);
900 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
905 features = btrfs_super_incompat_flags(sb) &
906 ~BTRFS_FEATURE_INCOMPAT_SUPP;
908 printk("couldn't open because of unsupported "
909 "option features (%Lx).\n",
910 (unsigned long long)features);
914 features = btrfs_super_incompat_flags(sb);
915 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
916 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
917 btrfs_set_super_incompat_flags(sb, features);
920 features = btrfs_super_compat_ro_flags(sb);
921 if (flags & OPEN_CTREE_WRITES) {
922 if (flags & OPEN_CTREE_INVALIDATE_FST) {
923 /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
924 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
925 btrfs_set_super_compat_ro_flags(sb, features);
926 /* ... and ignore the free space tree bit. */
927 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
929 if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
930 printk("couldn't open RDWR because of unsupported "
931 "option features (%Lx).\n",
932 (unsigned long long)features);
940 static int find_best_backup_root(struct btrfs_super_block *super)
942 struct btrfs_root_backup *backup;
943 u64 orig_gen = btrfs_super_generation(super);
948 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
949 backup = super->super_roots + i;
950 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
951 btrfs_backup_tree_root_gen(backup) > gen) {
953 gen = btrfs_backup_tree_root_gen(backup);
959 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
961 struct btrfs_root *info_root,
962 u64 objectid, char *str)
964 struct btrfs_super_block *sb = fs_info->super_copy;
965 struct btrfs_root *root = fs_info->tree_root;
966 u32 nodesize = btrfs_super_nodesize(sb);
969 ret = find_and_setup_root(root, fs_info, objectid, info_root);
971 printk("Couldn't setup %s tree\n", str);
972 if (!(flags & OPEN_CTREE_PARTIAL))
975 * Need a blank node here just so we don't screw up in the
976 * million of places that assume a root has a valid ->node
979 btrfs_find_create_tree_block(fs_info, 0, nodesize);
980 if (!info_root->node)
982 clear_extent_buffer_uptodate(info_root->node);
988 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
991 struct btrfs_super_block *sb = fs_info->super_copy;
992 struct btrfs_root *root;
993 struct btrfs_key key;
998 root = fs_info->tree_root;
999 btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
1000 blocksize = fs_info->nodesize;
1001 generation = btrfs_super_generation(sb);
1003 if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
1004 root_tree_bytenr = btrfs_super_root(sb);
1005 } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
1006 struct btrfs_root_backup *backup;
1007 int index = find_best_backup_root(sb);
1008 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
1009 fprintf(stderr, "Invalid backup root number\n");
1012 backup = fs_info->super_copy->super_roots + index;
1013 root_tree_bytenr = btrfs_backup_tree_root(backup);
1014 generation = btrfs_backup_tree_root_gen(backup);
1017 root->node = read_tree_block(fs_info, root_tree_bytenr, blocksize,
1019 if (!extent_buffer_uptodate(root->node)) {
1020 fprintf(stderr, "Couldn't read tree root\n");
1024 ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
1025 BTRFS_EXTENT_TREE_OBJECTID, "extent");
1028 fs_info->extent_root->track_dirty = 1;
1030 ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1033 printk("Couldn't setup device tree\n");
1036 fs_info->dev_root->track_dirty = 1;
1038 ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1039 BTRFS_CSUM_TREE_OBJECTID, "csum");
1042 fs_info->csum_root->track_dirty = 1;
1044 ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1045 fs_info->quota_root);
1047 free(fs_info->quota_root);
1048 fs_info->quota_root = NULL;
1050 fs_info->quota_enabled = 1;
1053 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
1054 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1055 fs_info->free_space_root);
1057 printk("Couldn't read free space tree\n");
1060 fs_info->free_space_root->track_dirty = 1;
1063 ret = find_and_setup_log_root(root, fs_info, sb);
1065 printk("Couldn't setup log root tree\n");
1066 if (!(flags & OPEN_CTREE_PARTIAL))
1070 fs_info->generation = generation;
1071 fs_info->last_trans_committed = generation;
1072 if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1073 !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
1074 btrfs_read_block_groups(fs_info->tree_root);
1076 key.objectid = BTRFS_FS_TREE_OBJECTID;
1077 key.type = BTRFS_ROOT_ITEM_KEY;
1078 key.offset = (u64)-1;
1079 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1081 if (IS_ERR(fs_info->fs_root))
1086 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1088 if (fs_info->free_space_root)
1089 free_extent_buffer(fs_info->free_space_root->node);
1090 if (fs_info->quota_root)
1091 free_extent_buffer(fs_info->quota_root->node);
1092 if (fs_info->csum_root)
1093 free_extent_buffer(fs_info->csum_root->node);
1094 if (fs_info->dev_root)
1095 free_extent_buffer(fs_info->dev_root->node);
1096 if (fs_info->extent_root)
1097 free_extent_buffer(fs_info->extent_root->node);
1098 if (fs_info->tree_root)
1099 free_extent_buffer(fs_info->tree_root->node);
1100 if (fs_info->log_root_tree)
1101 free_extent_buffer(fs_info->log_root_tree->node);
1102 if (fs_info->chunk_root)
1103 free_extent_buffer(fs_info->chunk_root->node);
1106 static void free_map_lookup(struct cache_extent *ce)
1108 struct map_lookup *map;
1110 map = container_of(ce, struct map_lookup, ce);
1114 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1116 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1118 while (!list_empty(&fs_info->recow_ebs)) {
1119 struct extent_buffer *eb;
1120 eb = list_first_entry(&fs_info->recow_ebs,
1121 struct extent_buffer, recow);
1122 list_del_init(&eb->recow);
1123 free_extent_buffer(eb);
1125 free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1126 extent_io_tree_cleanup(&fs_info->extent_cache);
1127 extent_io_tree_cleanup(&fs_info->free_space_cache);
1128 extent_io_tree_cleanup(&fs_info->block_group_cache);
1129 extent_io_tree_cleanup(&fs_info->pinned_extents);
1130 extent_io_tree_cleanup(&fs_info->pending_del);
1131 extent_io_tree_cleanup(&fs_info->extent_ins);
1134 int btrfs_scan_fs_devices(int fd, const char *path,
1135 struct btrfs_fs_devices **fs_devices,
1136 u64 sb_bytenr, unsigned sbflags,
1144 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1146 seek_ret = lseek(fd, 0, SEEK_END);
1150 dev_size = seek_ret;
1151 lseek(fd, 0, SEEK_SET);
1152 if (sb_bytenr > dev_size) {
1153 error("superblock bytenr %llu is larger than device size %llu",
1154 (unsigned long long)sb_bytenr,
1155 (unsigned long long)dev_size);
1159 ret = btrfs_scan_one_device(fd, path, fs_devices,
1160 &total_devs, sb_bytenr, sbflags);
1162 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1166 if (!skip_devices && total_devs != 1) {
1167 ret = btrfs_scan_devices();
1174 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1175 u64 chunk_root_bytenr)
1177 struct btrfs_super_block *sb = fs_info->super_copy;
1181 btrfs_setup_root(fs_info->chunk_root, fs_info,
1182 BTRFS_CHUNK_TREE_OBJECTID);
1184 ret = btrfs_read_sys_array(fs_info->chunk_root);
1188 generation = btrfs_super_chunk_root_generation(sb);
1190 if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1191 fs_info->sectorsize)) {
1192 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1193 chunk_root_bytenr, fs_info->sectorsize);
1194 chunk_root_bytenr = 0;
1197 if (!chunk_root_bytenr)
1198 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1202 fs_info->chunk_root->node = read_tree_block(fs_info,
1206 if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1207 if (fs_info->ignore_chunk_tree_error) {
1208 warning("cannot read chunk root, continue anyway");
1209 fs_info->chunk_root = NULL;
1212 error("cannot read chunk root");
1217 if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1218 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1220 fprintf(stderr, "Couldn't read chunk tree\n");
1227 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1229 u64 root_tree_bytenr,
1230 u64 chunk_root_bytenr,
1233 struct btrfs_fs_info *fs_info;
1234 struct btrfs_super_block *disk_super;
1235 struct btrfs_fs_devices *fs_devices = NULL;
1236 struct extent_buffer *eb;
1239 unsigned sbflags = SBREAD_DEFAULT;
1242 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1244 /* try to drop all the caches */
1245 if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1246 fprintf(stderr, "Warning, could not drop caches\n");
1248 fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1250 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1253 if (flags & OPEN_CTREE_RESTORE)
1254 fs_info->on_restoring = 1;
1255 if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1256 fs_info->suppress_check_block_errors = 1;
1257 if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1258 fs_info->ignore_fsid_mismatch = 1;
1259 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1260 fs_info->ignore_chunk_tree_error = 1;
1262 if ((flags & OPEN_CTREE_RECOVER_SUPER)
1263 && (flags & OPEN_CTREE_FS_PARTIAL)) {
1265 "cannot open a partially created filesystem for recovery");
1269 if (flags & OPEN_CTREE_FS_PARTIAL)
1270 sbflags = SBREAD_PARTIAL;
1272 ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1273 (flags & OPEN_CTREE_NO_DEVICES));
1277 fs_info->fs_devices = fs_devices;
1278 if (flags & OPEN_CTREE_WRITES)
1283 if (flags & OPEN_CTREE_EXCLUSIVE)
1286 ret = btrfs_open_devices(fs_devices, oflags);
1290 disk_super = fs_info->super_copy;
1291 if (flags & OPEN_CTREE_RECOVER_SUPER)
1292 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1293 sb_bytenr, SBREAD_RECOVER);
1295 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1298 printk("No valid btrfs found\n");
1302 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1303 !fs_info->ignore_fsid_mismatch) {
1304 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1308 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1309 fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
1310 fs_info->nodesize = btrfs_super_nodesize(disk_super);
1311 fs_info->stripesize = btrfs_super_stripesize(disk_super);
1313 ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
1317 ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1321 /* Chunk tree root is unable to read, return directly */
1322 if (!fs_info->chunk_root)
1325 eb = fs_info->chunk_root->node;
1326 read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1327 btrfs_header_chunk_tree_uuid(eb),
1330 ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1331 if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1332 !fs_info->ignore_chunk_tree_error)
1338 btrfs_release_all_roots(fs_info);
1339 btrfs_cleanup_all_caches(fs_info);
1341 btrfs_close_devices(fs_devices);
1343 btrfs_free_fs_info(fs_info);
1347 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1348 u64 sb_bytenr, u64 root_tree_bytenr,
1349 u64 chunk_root_bytenr,
1354 struct btrfs_fs_info *info;
1355 int oflags = O_RDWR;
1358 ret = stat(filename, &st);
1360 error("cannot stat '%s': %s", filename, strerror(errno));
1363 if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1364 error("not a regular file or block device: %s", filename);
1368 if (!(flags & OPEN_CTREE_WRITES))
1371 fp = open(filename, oflags);
1373 error("cannot open '%s': %s", filename, strerror(errno));
1376 info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1377 chunk_root_bytenr, flags);
1382 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1385 struct btrfs_fs_info *info;
1387 /* This flags may not return fs_info with any valid root */
1388 BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1389 info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1392 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1393 return info->chunk_root;
1394 return info->fs_root;
1397 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1400 struct btrfs_fs_info *info;
1402 /* This flags may not return fs_info with any valid root */
1403 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
1404 error("invalid open_ctree flags: 0x%llx",
1405 (unsigned long long)flags);
1408 info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1411 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1412 return info->chunk_root;
1413 return info->fs_root;
1417 * Check if the super is valid:
1418 * - nodesize/sectorsize - minimum, maximum, alignment
1419 * - tree block starts - alignment
1420 * - number of devices - something sane
1421 * - sys array size - maximum
1423 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1425 u8 result[BTRFS_CSUM_SIZE];
1430 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1431 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1432 if (!(sbflags & SBREAD_PARTIAL)) {
1433 error("superblock magic doesn't match");
1439 csum_type = btrfs_super_csum_type(sb);
1440 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1441 error("unsupported checksum algorithm %u", csum_type);
1444 csum_size = btrfs_csum_sizes[csum_type];
1447 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1448 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1449 btrfs_csum_final(crc, result);
1451 if (memcmp(result, sb->csum, csum_size)) {
1452 error("superblock checksum mismatch");
1455 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1456 error("tree_root level too big: %d >= %d",
1457 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1460 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1461 error("chunk_root level too big: %d >= %d",
1462 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1465 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1466 error("log_root level too big: %d >= %d",
1467 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1471 if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1472 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1475 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1476 error("chunk_root block unaligned: %llu",
1477 btrfs_super_chunk_root(sb));
1480 if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1481 error("log_root block unaligned: %llu",
1482 btrfs_super_log_root(sb));
1485 if (btrfs_super_nodesize(sb) < 4096) {
1486 error("nodesize too small: %u < 4096",
1487 btrfs_super_nodesize(sb));
1490 if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1491 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1494 if (btrfs_super_sectorsize(sb) < 4096) {
1495 error("sectorsize too small: %u < 4096",
1496 btrfs_super_sectorsize(sb));
1499 if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1500 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1503 if (btrfs_super_total_bytes(sb) == 0) {
1504 error("invalid total_bytes 0");
1507 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1508 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1511 if ((btrfs_super_stripesize(sb) != 4096)
1512 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1513 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1517 if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1518 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1519 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1521 uuid_unparse(sb->fsid, fsid);
1522 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1523 error("dev_item UUID does not match fsid: %s != %s",
1529 * Hint to catch really bogus numbers, bitflips or so
1531 if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1532 warning("suspicious number of devices: %llu",
1533 btrfs_super_num_devices(sb));
1536 if (btrfs_super_num_devices(sb) == 0) {
1537 error("number of devices is 0");
1542 * Obvious sys_chunk_array corruptions, it must hold at least one key
1545 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1546 error("system chunk array too big %u > %u",
1547 btrfs_super_sys_array_size(sb),
1548 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1551 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1552 + sizeof(struct btrfs_chunk)) {
1553 error("system chunk array too small %u < %zu",
1554 btrfs_super_sys_array_size(sb),
1555 sizeof(struct btrfs_disk_key) +
1556 sizeof(struct btrfs_chunk));
1563 error("superblock checksum matches but it has invalid members");
1567 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1570 u8 fsid[BTRFS_FSID_SIZE];
1571 int fsid_is_initialized = 0;
1572 char tmp[BTRFS_SUPER_INFO_SIZE];
1573 struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1576 int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1580 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1581 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1586 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1587 if (ret < BTRFS_SUPER_INFO_SIZE)
1590 if (btrfs_super_bytenr(buf) != sb_bytenr)
1593 ret = check_super(buf, sbflags);
1596 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1601 * we would like to check all the supers, but that would make
1602 * a btrfs mount succeed after a mkfs from a different FS.
1603 * So, we need to add a special mount option to scan for
1604 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1607 for (i = 0; i < max_super; i++) {
1608 bytenr = btrfs_sb_offset(i);
1609 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1610 if (ret < BTRFS_SUPER_INFO_SIZE)
1613 if (btrfs_super_bytenr(buf) != bytenr )
1615 /* if magic is NULL, the device was removed */
1616 if (btrfs_super_magic(buf) == 0 && i == 0)
1618 if (check_super(buf, sbflags))
1621 if (!fsid_is_initialized) {
1622 memcpy(fsid, buf->fsid, sizeof(fsid));
1623 fsid_is_initialized = 1;
1624 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1626 * the superblocks (the original one and
1627 * its backups) contain data of different
1628 * filesystems -> the super cannot be trusted
1633 if (btrfs_super_generation(buf) > transid) {
1634 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1635 transid = btrfs_super_generation(buf);
1639 return transid > 0 ? 0 : -1;
1642 static int write_dev_supers(struct btrfs_root *root,
1643 struct btrfs_super_block *sb,
1644 struct btrfs_device *device)
1650 if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1651 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1653 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1654 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1655 btrfs_csum_final(crc, &sb->csum[0]);
1658 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1659 * zero filled, we can use it directly
1661 ret = pwrite64(device->fd, root->fs_info->super_copy,
1662 BTRFS_SUPER_INFO_SIZE,
1663 root->fs_info->super_bytenr);
1664 if (ret != BTRFS_SUPER_INFO_SIZE)
1669 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1670 bytenr = btrfs_sb_offset(i);
1671 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1674 btrfs_set_super_bytenr(sb, bytenr);
1677 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1678 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1679 btrfs_csum_final(crc, &sb->csum[0]);
1682 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1683 * zero filled, we can use it directly
1685 ret = pwrite64(device->fd, root->fs_info->super_copy,
1686 BTRFS_SUPER_INFO_SIZE, bytenr);
1687 if (ret != BTRFS_SUPER_INFO_SIZE)
1695 fprintf(stderr, "WARNING: failed to write all sb data\n");
1697 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1702 int write_all_supers(struct btrfs_root *root)
1704 struct list_head *cur;
1705 struct list_head *head = &root->fs_info->fs_devices->devices;
1706 struct btrfs_device *dev;
1707 struct btrfs_super_block *sb;
1708 struct btrfs_dev_item *dev_item;
1712 sb = root->fs_info->super_copy;
1713 dev_item = &sb->dev_item;
1714 list_for_each(cur, head) {
1715 dev = list_entry(cur, struct btrfs_device, dev_list);
1716 if (!dev->writeable)
1719 btrfs_set_stack_device_generation(dev_item, 0);
1720 btrfs_set_stack_device_type(dev_item, dev->type);
1721 btrfs_set_stack_device_id(dev_item, dev->devid);
1722 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1723 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1724 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1725 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1726 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1727 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1728 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1730 flags = btrfs_super_flags(sb);
1731 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1733 ret = write_dev_supers(root, sb, dev);
1739 int write_ctree_super(struct btrfs_trans_handle *trans,
1740 struct btrfs_root *root)
1743 struct btrfs_root *tree_root = root->fs_info->tree_root;
1744 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1746 if (root->fs_info->readonly)
1749 btrfs_set_super_generation(root->fs_info->super_copy,
1751 btrfs_set_super_root(root->fs_info->super_copy,
1752 tree_root->node->start);
1753 btrfs_set_super_root_level(root->fs_info->super_copy,
1754 btrfs_header_level(tree_root->node));
1755 btrfs_set_super_chunk_root(root->fs_info->super_copy,
1756 chunk_root->node->start);
1757 btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1758 btrfs_header_level(chunk_root->node));
1759 btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1760 btrfs_header_generation(chunk_root->node));
1762 ret = write_all_supers(root);
1764 fprintf(stderr, "failed to write new super block err %d\n", ret);
1768 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1771 struct btrfs_trans_handle *trans;
1772 struct btrfs_root *root = fs_info->tree_root;
1774 if (fs_info->last_trans_committed !=
1775 fs_info->generation) {
1777 trans = btrfs_start_transaction(root, 1);
1778 btrfs_commit_transaction(trans, root);
1779 trans = btrfs_start_transaction(root, 1);
1780 ret = commit_tree_roots(trans, fs_info);
1782 ret = __commit_transaction(trans, root);
1784 write_ctree_super(trans, root);
1788 if (fs_info->finalize_on_close) {
1789 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1790 root->fs_info->finalize_on_close = 0;
1791 ret = write_all_supers(root);
1794 "failed to write new super block err %d\n", ret);
1796 btrfs_free_block_groups(fs_info);
1798 free_fs_roots_tree(&fs_info->fs_root_tree);
1800 btrfs_release_all_roots(fs_info);
1801 ret = btrfs_close_devices(fs_info->fs_devices);
1802 btrfs_cleanup_all_caches(fs_info);
1803 btrfs_free_fs_info(fs_info);
1807 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1808 struct extent_buffer *eb)
1810 return clear_extent_buffer_dirty(eb);
1813 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1815 set_extent_buffer_dirty(eb);
1818 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1822 ret = extent_buffer_uptodate(buf);
1826 ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1830 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1832 return set_extent_buffer_uptodate(eb);