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;
316 u32 sectorsize
= btrfs_super_sectorsize(fs_info
->super_copy
);
317 u32 nodesize
= btrfs_super_nodesize(fs_info
->super_copy
);
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 (!IS_ALIGNED(bytenr
, sectorsize
)) {
330 error("tree block bytenr %llu is not aligned to sectorsize %u",
332 return ERR_PTR(-EIO
);
334 if (!IS_ALIGNED(blocksize
, nodesize
)) {
335 error("tree block size %u is not aligned to nodesize %u",
336 blocksize
, nodesize
);
337 return ERR_PTR(-EIO
);
339 eb
= btrfs_find_create_tree_block(fs_info
, bytenr
, blocksize
);
341 return ERR_PTR(-ENOMEM
);
343 if (btrfs_buffer_uptodate(eb
, parent_transid
))
347 ret
= read_whole_eb(fs_info
, eb
, mirror_num
);
348 if (ret
== 0 && csum_tree_block_fs_info(fs_info
, eb
, 1) == 0 &&
349 check_tree_block(fs_info
, eb
) == 0 &&
350 verify_parent_transid(eb
->tree
, eb
, parent_transid
, ignore
)
352 if (eb
->flags
& EXTENT_BAD_TRANSID
&&
353 list_empty(&eb
->recow
)) {
354 list_add_tail(&eb
->recow
,
355 &fs_info
->recow_ebs
);
358 btrfs_set_buffer_uptodate(eb
);
362 if (check_tree_block(fs_info
, eb
)) {
363 if (!fs_info
->suppress_check_block_errors
)
364 print_tree_block_error(fs_info
, eb
,
365 check_tree_block(fs_info
, eb
));
367 if (!fs_info
->suppress_check_block_errors
)
368 fprintf(stderr
, "Csum didn't match\n");
373 num_copies
= btrfs_num_copies(&fs_info
->mapping_tree
,
375 if (num_copies
== 1) {
379 if (btrfs_header_generation(eb
) > best_transid
&& mirror_num
) {
380 best_transid
= btrfs_header_generation(eb
);
381 good_mirror
= mirror_num
;
384 if (mirror_num
> num_copies
) {
385 mirror_num
= good_mirror
;
390 free_extent_buffer(eb
);
394 int read_extent_data(struct btrfs_root
*root
, char *data
,
395 u64 logical
, u64
*len
, int mirror
)
398 struct btrfs_multi_bio
*multi
= NULL
;
399 struct btrfs_fs_info
*info
= root
->fs_info
;
400 struct btrfs_device
*device
;
404 ret
= btrfs_map_block(&info
->mapping_tree
, READ
, logical
, len
,
405 &multi
, mirror
, NULL
);
407 fprintf(stderr
, "Couldn't map the block %llu\n",
411 device
= multi
->stripes
[0].dev
;
418 ret
= pread64(device
->fd
, data
, *len
, multi
->stripes
[0].physical
);
428 int write_and_map_eb(struct btrfs_trans_handle
*trans
,
429 struct btrfs_root
*root
,
430 struct extent_buffer
*eb
)
435 u64
*raid_map
= NULL
;
436 struct btrfs_multi_bio
*multi
= NULL
;
440 ret
= btrfs_map_block(&root
->fs_info
->mapping_tree
, WRITE
,
441 eb
->start
, &length
, &multi
, 0, &raid_map
);
444 ret
= write_raid56_with_parity(root
->fs_info
, eb
, multi
,
447 } else while (dev_nr
< multi
->num_stripes
) {
449 eb
->fd
= multi
->stripes
[dev_nr
].dev
->fd
;
450 eb
->dev_bytenr
= multi
->stripes
[dev_nr
].physical
;
451 multi
->stripes
[dev_nr
].dev
->total_ios
++;
453 ret
= write_extent_to_disk(eb
);
461 int write_tree_block(struct btrfs_trans_handle
*trans
,
462 struct btrfs_root
*root
,
463 struct extent_buffer
*eb
)
465 if (check_tree_block(root
->fs_info
, eb
)) {
466 print_tree_block_error(root
->fs_info
, eb
,
467 check_tree_block(root
->fs_info
, eb
));
471 if (trans
&& !btrfs_buffer_uptodate(eb
, trans
->transid
))
474 btrfs_set_header_flag(eb
, BTRFS_HEADER_FLAG_WRITTEN
);
475 csum_tree_block(root
, eb
, 0);
477 return write_and_map_eb(trans
, root
, eb
);
480 int __setup_root(u32 nodesize
, u32 leafsize
, u32 sectorsize
,
481 u32 stripesize
, struct btrfs_root
*root
,
482 struct btrfs_fs_info
*fs_info
, u64 objectid
)
485 root
->commit_root
= NULL
;
486 root
->sectorsize
= sectorsize
;
487 root
->nodesize
= nodesize
;
488 root
->leafsize
= leafsize
;
489 root
->stripesize
= stripesize
;
491 root
->track_dirty
= 0;
493 root
->fs_info
= fs_info
;
494 root
->objectid
= objectid
;
495 root
->last_trans
= 0;
496 root
->highest_inode
= 0;
497 root
->last_inode_alloc
= 0;
499 INIT_LIST_HEAD(&root
->dirty_list
);
500 INIT_LIST_HEAD(&root
->orphan_data_extents
);
501 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
502 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
503 root
->root_key
.objectid
= objectid
;
507 static int update_cowonly_root(struct btrfs_trans_handle
*trans
,
508 struct btrfs_root
*root
)
512 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
514 btrfs_write_dirty_block_groups(trans
, root
);
516 old_root_bytenr
= btrfs_root_bytenr(&root
->root_item
);
517 if (old_root_bytenr
== root
->node
->start
)
519 btrfs_set_root_bytenr(&root
->root_item
,
521 btrfs_set_root_generation(&root
->root_item
,
523 root
->root_item
.level
= btrfs_header_level(root
->node
);
524 ret
= btrfs_update_root(trans
, tree_root
,
528 btrfs_write_dirty_block_groups(trans
, root
);
533 static int commit_tree_roots(struct btrfs_trans_handle
*trans
,
534 struct btrfs_fs_info
*fs_info
)
536 struct btrfs_root
*root
;
537 struct list_head
*next
;
538 struct extent_buffer
*eb
;
541 if (fs_info
->readonly
)
544 eb
= fs_info
->tree_root
->node
;
545 extent_buffer_get(eb
);
546 ret
= btrfs_cow_block(trans
, fs_info
->tree_root
, eb
, NULL
, 0, &eb
);
547 free_extent_buffer(eb
);
551 while(!list_empty(&fs_info
->dirty_cowonly_roots
)) {
552 next
= fs_info
->dirty_cowonly_roots
.next
;
554 root
= list_entry(next
, struct btrfs_root
, dirty_list
);
555 update_cowonly_root(trans
, root
);
556 free_extent_buffer(root
->commit_root
);
557 root
->commit_root
= NULL
;
563 static int __commit_transaction(struct btrfs_trans_handle
*trans
,
564 struct btrfs_root
*root
)
568 struct extent_buffer
*eb
;
569 struct extent_io_tree
*tree
= &root
->fs_info
->extent_cache
;
573 ret
= find_first_extent_bit(tree
, 0, &start
, &end
,
577 while(start
<= end
) {
578 eb
= find_first_extent_buffer(tree
, start
);
579 BUG_ON(!eb
|| eb
->start
!= start
);
580 ret
= write_tree_block(trans
, root
, eb
);
583 clear_extent_buffer_dirty(eb
);
584 free_extent_buffer(eb
);
590 int btrfs_commit_transaction(struct btrfs_trans_handle
*trans
,
591 struct btrfs_root
*root
)
593 u64 transid
= trans
->transid
;
595 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
597 if (root
->commit_root
== root
->node
)
599 if (root
== root
->fs_info
->tree_root
)
601 if (root
== root
->fs_info
->chunk_root
)
604 free_extent_buffer(root
->commit_root
);
605 root
->commit_root
= NULL
;
607 btrfs_set_root_bytenr(&root
->root_item
, root
->node
->start
);
608 btrfs_set_root_generation(&root
->root_item
, trans
->transid
);
609 root
->root_item
.level
= btrfs_header_level(root
->node
);
610 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
611 &root
->root_key
, &root
->root_item
);
614 ret
= commit_tree_roots(trans
, fs_info
);
616 ret
= __commit_transaction(trans
, root
);
618 write_ctree_super(trans
, root
);
619 btrfs_finish_extent_commit(trans
, fs_info
->extent_root
,
620 &fs_info
->pinned_extents
);
621 btrfs_free_transaction(root
, trans
);
622 free_extent_buffer(root
->commit_root
);
623 root
->commit_root
= NULL
;
624 fs_info
->running_transaction
= NULL
;
625 fs_info
->last_trans_committed
= transid
;
629 static int find_and_setup_root(struct btrfs_root
*tree_root
,
630 struct btrfs_fs_info
*fs_info
,
631 u64 objectid
, struct btrfs_root
*root
)
637 __setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
638 tree_root
->sectorsize
, tree_root
->stripesize
,
639 root
, fs_info
, objectid
);
640 ret
= btrfs_find_last_root(tree_root
, objectid
,
641 &root
->root_item
, &root
->root_key
);
645 blocksize
= root
->nodesize
;
646 generation
= btrfs_root_generation(&root
->root_item
);
647 root
->node
= read_tree_block(root
, btrfs_root_bytenr(&root
->root_item
),
648 blocksize
, generation
);
649 if (!extent_buffer_uptodate(root
->node
))
655 static int find_and_setup_log_root(struct btrfs_root
*tree_root
,
656 struct btrfs_fs_info
*fs_info
,
657 struct btrfs_super_block
*disk_super
)
660 u64 blocknr
= btrfs_super_log_root(disk_super
);
661 struct btrfs_root
*log_root
= malloc(sizeof(struct btrfs_root
));
671 blocksize
= tree_root
->nodesize
;
673 __setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
674 tree_root
->sectorsize
, tree_root
->stripesize
,
675 log_root
, fs_info
, BTRFS_TREE_LOG_OBJECTID
);
677 log_root
->node
= read_tree_block(tree_root
, blocknr
,
679 btrfs_super_generation(disk_super
) + 1);
681 fs_info
->log_root_tree
= log_root
;
683 if (!extent_buffer_uptodate(log_root
->node
)) {
684 free_extent_buffer(log_root
->node
);
686 fs_info
->log_root_tree
= NULL
;
693 int btrfs_free_fs_root(struct btrfs_root
*root
)
696 free_extent_buffer(root
->node
);
697 if (root
->commit_root
)
698 free_extent_buffer(root
->commit_root
);
703 static void __free_fs_root(struct rb_node
*node
)
705 struct btrfs_root
*root
;
707 root
= container_of(node
, struct btrfs_root
, rb_node
);
708 btrfs_free_fs_root(root
);
711 FREE_RB_BASED_TREE(fs_roots
, __free_fs_root
);
713 struct btrfs_root
*btrfs_read_fs_root_no_cache(struct btrfs_fs_info
*fs_info
,
714 struct btrfs_key
*location
)
716 struct btrfs_root
*root
;
717 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
718 struct btrfs_path
*path
;
719 struct extent_buffer
*l
;
724 root
= calloc(1, sizeof(*root
));
726 return ERR_PTR(-ENOMEM
);
727 if (location
->offset
== (u64
)-1) {
728 ret
= find_and_setup_root(tree_root
, fs_info
,
729 location
->objectid
, root
);
737 __setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
738 tree_root
->sectorsize
, tree_root
->stripesize
,
739 root
, fs_info
, location
->objectid
);
741 path
= btrfs_alloc_path();
743 ret
= btrfs_search_slot(NULL
, tree_root
, location
, path
, 0, 0);
750 read_extent_buffer(l
, &root
->root_item
,
751 btrfs_item_ptr_offset(l
, path
->slots
[0]),
752 sizeof(root
->root_item
));
753 memcpy(&root
->root_key
, location
, sizeof(*location
));
756 btrfs_free_path(path
);
761 generation
= btrfs_root_generation(&root
->root_item
);
762 blocksize
= root
->nodesize
;
763 root
->node
= read_tree_block(root
, btrfs_root_bytenr(&root
->root_item
),
764 blocksize
, generation
);
765 if (!extent_buffer_uptodate(root
->node
)) {
767 return ERR_PTR(-EIO
);
774 static int btrfs_fs_roots_compare_objectids(struct rb_node
*node
,
777 u64 objectid
= *((u64
*)data
);
778 struct btrfs_root
*root
;
780 root
= rb_entry(node
, struct btrfs_root
, rb_node
);
781 if (objectid
> root
->objectid
)
783 else if (objectid
< root
->objectid
)
789 static int btrfs_fs_roots_compare_roots(struct rb_node
*node1
,
790 struct rb_node
*node2
)
792 struct btrfs_root
*root
;
794 root
= rb_entry(node2
, struct btrfs_root
, rb_node
);
795 return btrfs_fs_roots_compare_objectids(node1
, (void *)&root
->objectid
);
798 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_fs_info
*fs_info
,
799 struct btrfs_key
*location
)
801 struct btrfs_root
*root
;
802 struct rb_node
*node
;
804 u64 objectid
= location
->objectid
;
806 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
807 return fs_info
->tree_root
;
808 if (location
->objectid
== BTRFS_EXTENT_TREE_OBJECTID
)
809 return fs_info
->extent_root
;
810 if (location
->objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
811 return fs_info
->chunk_root
;
812 if (location
->objectid
== BTRFS_DEV_TREE_OBJECTID
)
813 return fs_info
->dev_root
;
814 if (location
->objectid
== BTRFS_CSUM_TREE_OBJECTID
)
815 return fs_info
->csum_root
;
816 if (location
->objectid
== BTRFS_QUOTA_TREE_OBJECTID
)
817 return fs_info
->quota_root
;
819 BUG_ON(location
->objectid
== BTRFS_TREE_RELOC_OBJECTID
||
820 location
->offset
!= (u64
)-1);
822 node
= rb_search(&fs_info
->fs_root_tree
, (void *)&objectid
,
823 btrfs_fs_roots_compare_objectids
, NULL
);
825 return container_of(node
, struct btrfs_root
, rb_node
);
827 root
= btrfs_read_fs_root_no_cache(fs_info
, location
);
831 ret
= rb_insert(&fs_info
->fs_root_tree
, &root
->rb_node
,
832 btrfs_fs_roots_compare_roots
);
837 void btrfs_free_fs_info(struct btrfs_fs_info
*fs_info
)
839 free(fs_info
->tree_root
);
840 free(fs_info
->extent_root
);
841 free(fs_info
->chunk_root
);
842 free(fs_info
->dev_root
);
843 free(fs_info
->csum_root
);
844 free(fs_info
->quota_root
);
845 free(fs_info
->free_space_root
);
846 free(fs_info
->super_copy
);
847 free(fs_info
->log_root_tree
);
851 struct btrfs_fs_info
*btrfs_new_fs_info(int writable
, u64 sb_bytenr
)
853 struct btrfs_fs_info
*fs_info
;
855 fs_info
= calloc(1, sizeof(struct btrfs_fs_info
));
859 fs_info
->tree_root
= calloc(1, sizeof(struct btrfs_root
));
860 fs_info
->extent_root
= calloc(1, sizeof(struct btrfs_root
));
861 fs_info
->chunk_root
= calloc(1, sizeof(struct btrfs_root
));
862 fs_info
->dev_root
= calloc(1, sizeof(struct btrfs_root
));
863 fs_info
->csum_root
= calloc(1, sizeof(struct btrfs_root
));
864 fs_info
->quota_root
= calloc(1, sizeof(struct btrfs_root
));
865 fs_info
->free_space_root
= calloc(1, sizeof(struct btrfs_root
));
866 fs_info
->super_copy
= calloc(1, BTRFS_SUPER_INFO_SIZE
);
868 if (!fs_info
->tree_root
|| !fs_info
->extent_root
||
869 !fs_info
->chunk_root
|| !fs_info
->dev_root
||
870 !fs_info
->csum_root
|| !fs_info
->quota_root
||
871 !fs_info
->free_space_root
|| !fs_info
->super_copy
)
874 extent_io_tree_init(&fs_info
->extent_cache
);
875 extent_io_tree_init(&fs_info
->free_space_cache
);
876 extent_io_tree_init(&fs_info
->block_group_cache
);
877 extent_io_tree_init(&fs_info
->pinned_extents
);
878 extent_io_tree_init(&fs_info
->pending_del
);
879 extent_io_tree_init(&fs_info
->extent_ins
);
880 fs_info
->excluded_extents
= NULL
;
882 fs_info
->fs_root_tree
= RB_ROOT
;
883 cache_tree_init(&fs_info
->mapping_tree
.cache_tree
);
885 mutex_init(&fs_info
->fs_mutex
);
886 INIT_LIST_HEAD(&fs_info
->dirty_cowonly_roots
);
887 INIT_LIST_HEAD(&fs_info
->space_info
);
888 INIT_LIST_HEAD(&fs_info
->recow_ebs
);
891 fs_info
->readonly
= 1;
893 fs_info
->super_bytenr
= sb_bytenr
;
894 fs_info
->data_alloc_profile
= (u64
)-1;
895 fs_info
->metadata_alloc_profile
= (u64
)-1;
896 fs_info
->system_alloc_profile
= fs_info
->metadata_alloc_profile
;
899 btrfs_free_fs_info(fs_info
);
903 int btrfs_check_fs_compatibility(struct btrfs_super_block
*sb
, int writable
)
907 features
= btrfs_super_incompat_flags(sb
) &
908 ~BTRFS_FEATURE_INCOMPAT_SUPP
;
910 printk("couldn't open because of unsupported "
911 "option features (%Lx).\n",
912 (unsigned long long)features
);
916 features
= btrfs_super_incompat_flags(sb
);
917 if (!(features
& BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
)) {
918 features
|= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
;
919 btrfs_set_super_incompat_flags(sb
, features
);
922 features
= btrfs_super_compat_ro_flags(sb
) &
923 ~BTRFS_FEATURE_COMPAT_RO_SUPP
;
924 if (writable
&& features
) {
925 printk("couldn't open RDWR because of unsupported "
926 "option features (%Lx).\n",
927 (unsigned long long)features
);
933 static int find_best_backup_root(struct btrfs_super_block
*super
)
935 struct btrfs_root_backup
*backup
;
936 u64 orig_gen
= btrfs_super_generation(super
);
941 for (i
= 0; i
< BTRFS_NUM_BACKUP_ROOTS
; i
++) {
942 backup
= super
->super_roots
+ i
;
943 if (btrfs_backup_tree_root_gen(backup
) != orig_gen
&&
944 btrfs_backup_tree_root_gen(backup
) > gen
) {
946 gen
= btrfs_backup_tree_root_gen(backup
);
952 static int setup_root_or_create_block(struct btrfs_fs_info
*fs_info
,
954 struct btrfs_root
*info_root
,
955 u64 objectid
, char *str
)
957 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
958 struct btrfs_root
*root
= fs_info
->tree_root
;
959 u32 nodesize
= btrfs_super_nodesize(sb
);
962 ret
= find_and_setup_root(root
, fs_info
, objectid
, info_root
);
964 printk("Couldn't setup %s tree\n", str
);
965 if (!(flags
& OPEN_CTREE_PARTIAL
))
968 * Need a blank node here just so we don't screw up in the
969 * million of places that assume a root has a valid ->node
972 btrfs_find_create_tree_block(fs_info
, 0, nodesize
);
973 if (!info_root
->node
)
975 clear_extent_buffer_uptodate(NULL
, info_root
->node
);
981 int btrfs_setup_all_roots(struct btrfs_fs_info
*fs_info
, u64 root_tree_bytenr
,
984 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
985 struct btrfs_root
*root
;
986 struct btrfs_key key
;
995 nodesize
= btrfs_super_nodesize(sb
);
996 leafsize
= btrfs_super_leafsize(sb
);
997 sectorsize
= btrfs_super_sectorsize(sb
);
998 stripesize
= btrfs_super_stripesize(sb
);
1000 root
= fs_info
->tree_root
;
1001 __setup_root(nodesize
, leafsize
, sectorsize
, stripesize
,
1002 root
, fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
1003 blocksize
= root
->nodesize
;
1004 generation
= btrfs_super_generation(sb
);
1006 if (!root_tree_bytenr
&& !(flags
& OPEN_CTREE_BACKUP_ROOT
)) {
1007 root_tree_bytenr
= btrfs_super_root(sb
);
1008 } else if (flags
& OPEN_CTREE_BACKUP_ROOT
) {
1009 struct btrfs_root_backup
*backup
;
1010 int index
= find_best_backup_root(sb
);
1011 if (index
>= BTRFS_NUM_BACKUP_ROOTS
) {
1012 fprintf(stderr
, "Invalid backup root number\n");
1015 backup
= fs_info
->super_copy
->super_roots
+ index
;
1016 root_tree_bytenr
= btrfs_backup_tree_root(backup
);
1017 generation
= btrfs_backup_tree_root_gen(backup
);
1020 root
->node
= read_tree_block(root
, root_tree_bytenr
, blocksize
,
1022 if (!extent_buffer_uptodate(root
->node
)) {
1023 fprintf(stderr
, "Couldn't read tree root\n");
1027 ret
= setup_root_or_create_block(fs_info
, flags
, fs_info
->extent_root
,
1028 BTRFS_EXTENT_TREE_OBJECTID
, "extent");
1031 fs_info
->extent_root
->track_dirty
= 1;
1033 ret
= find_and_setup_root(root
, fs_info
, BTRFS_DEV_TREE_OBJECTID
,
1036 printk("Couldn't setup device tree\n");
1039 fs_info
->dev_root
->track_dirty
= 1;
1041 ret
= setup_root_or_create_block(fs_info
, flags
, fs_info
->csum_root
,
1042 BTRFS_CSUM_TREE_OBJECTID
, "csum");
1045 fs_info
->csum_root
->track_dirty
= 1;
1047 ret
= find_and_setup_root(root
, fs_info
, BTRFS_QUOTA_TREE_OBJECTID
,
1048 fs_info
->quota_root
);
1050 fs_info
->quota_enabled
= 1;
1052 if (btrfs_fs_compat_ro(fs_info
, BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE
)) {
1053 ret
= find_and_setup_root(root
, fs_info
, BTRFS_FREE_SPACE_TREE_OBJECTID
,
1054 fs_info
->free_space_root
);
1056 printk("Couldn't read free space tree\n");
1059 fs_info
->free_space_root
->track_dirty
= 1;
1062 ret
= find_and_setup_log_root(root
, fs_info
, sb
);
1064 printk("Couldn't setup log root tree\n");
1065 if (!(flags
& OPEN_CTREE_PARTIAL
))
1069 fs_info
->generation
= generation
;
1070 fs_info
->last_trans_committed
= generation
;
1071 if (extent_buffer_uptodate(fs_info
->extent_root
->node
) &&
1072 !(flags
& OPEN_CTREE_NO_BLOCK_GROUPS
))
1073 btrfs_read_block_groups(fs_info
->tree_root
);
1075 key
.objectid
= BTRFS_FS_TREE_OBJECTID
;
1076 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1077 key
.offset
= (u64
)-1;
1078 fs_info
->fs_root
= btrfs_read_fs_root(fs_info
, &key
);
1080 if (IS_ERR(fs_info
->fs_root
))
1085 void btrfs_release_all_roots(struct btrfs_fs_info
*fs_info
)
1087 if (fs_info
->free_space_root
)
1088 free_extent_buffer(fs_info
->free_space_root
->node
);
1089 if (fs_info
->quota_root
)
1090 free_extent_buffer(fs_info
->quota_root
->node
);
1091 if (fs_info
->csum_root
)
1092 free_extent_buffer(fs_info
->csum_root
->node
);
1093 if (fs_info
->dev_root
)
1094 free_extent_buffer(fs_info
->dev_root
->node
);
1095 if (fs_info
->extent_root
)
1096 free_extent_buffer(fs_info
->extent_root
->node
);
1097 if (fs_info
->tree_root
)
1098 free_extent_buffer(fs_info
->tree_root
->node
);
1099 if (fs_info
->log_root_tree
)
1100 free_extent_buffer(fs_info
->log_root_tree
->node
);
1101 if (fs_info
->chunk_root
)
1102 free_extent_buffer(fs_info
->chunk_root
->node
);
1105 static void free_map_lookup(struct cache_extent
*ce
)
1107 struct map_lookup
*map
;
1109 map
= container_of(ce
, struct map_lookup
, ce
);
1113 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache
, free_map_lookup
);
1115 void btrfs_cleanup_all_caches(struct btrfs_fs_info
*fs_info
)
1117 while (!list_empty(&fs_info
->recow_ebs
)) {
1118 struct extent_buffer
*eb
;
1119 eb
= list_first_entry(&fs_info
->recow_ebs
,
1120 struct extent_buffer
, recow
);
1121 list_del_init(&eb
->recow
);
1122 free_extent_buffer(eb
);
1124 free_mapping_cache_tree(&fs_info
->mapping_tree
.cache_tree
);
1125 extent_io_tree_cleanup(&fs_info
->extent_cache
);
1126 extent_io_tree_cleanup(&fs_info
->free_space_cache
);
1127 extent_io_tree_cleanup(&fs_info
->block_group_cache
);
1128 extent_io_tree_cleanup(&fs_info
->pinned_extents
);
1129 extent_io_tree_cleanup(&fs_info
->pending_del
);
1130 extent_io_tree_cleanup(&fs_info
->extent_ins
);
1133 int btrfs_scan_fs_devices(int fd
, const char *path
,
1134 struct btrfs_fs_devices
**fs_devices
,
1135 u64 sb_bytenr
, unsigned sbflags
,
1143 sb_bytenr
= BTRFS_SUPER_INFO_OFFSET
;
1145 seek_ret
= lseek(fd
, 0, SEEK_END
);
1149 dev_size
= seek_ret
;
1150 lseek(fd
, 0, SEEK_SET
);
1151 if (sb_bytenr
> dev_size
) {
1152 error("superblock bytenr %llu is larger than device size %llu",
1153 (unsigned long long)sb_bytenr
,
1154 (unsigned long long)dev_size
);
1158 ret
= btrfs_scan_one_device(fd
, path
, fs_devices
,
1159 &total_devs
, sb_bytenr
, sbflags
);
1161 fprintf(stderr
, "No valid Btrfs found on %s\n", path
);
1165 if (!skip_devices
&& total_devs
!= 1) {
1166 ret
= btrfs_scan_lblkid();
1173 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info
*fs_info
,
1174 u64 chunk_root_bytenr
)
1176 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
1185 nodesize
= btrfs_super_nodesize(sb
);
1186 leafsize
= btrfs_super_leafsize(sb
);
1187 sectorsize
= btrfs_super_sectorsize(sb
);
1188 stripesize
= btrfs_super_stripesize(sb
);
1190 __setup_root(nodesize
, leafsize
, sectorsize
, stripesize
,
1191 fs_info
->chunk_root
, fs_info
, BTRFS_CHUNK_TREE_OBJECTID
);
1193 ret
= btrfs_read_sys_array(fs_info
->chunk_root
);
1197 blocksize
= fs_info
->chunk_root
->nodesize
;
1198 generation
= btrfs_super_chunk_root_generation(sb
);
1200 if (chunk_root_bytenr
&& !IS_ALIGNED(chunk_root_bytenr
,
1201 btrfs_super_sectorsize(sb
))) {
1202 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1203 chunk_root_bytenr
, btrfs_super_sectorsize(sb
));
1204 chunk_root_bytenr
= 0;
1207 if (!chunk_root_bytenr
)
1208 chunk_root_bytenr
= btrfs_super_chunk_root(sb
);
1212 fs_info
->chunk_root
->node
= read_tree_block(fs_info
->chunk_root
,
1214 blocksize
, generation
);
1215 if (!extent_buffer_uptodate(fs_info
->chunk_root
->node
)) {
1216 if (fs_info
->ignore_chunk_tree_error
) {
1217 warning("cannot read chunk root, continue anyway");
1218 fs_info
->chunk_root
= NULL
;
1221 error("cannot read chunk root");
1226 if (!(btrfs_super_flags(sb
) & BTRFS_SUPER_FLAG_METADUMP
)) {
1227 ret
= btrfs_read_chunk_tree(fs_info
->chunk_root
);
1229 fprintf(stderr
, "Couldn't read chunk tree\n");
1236 static struct btrfs_fs_info
*__open_ctree_fd(int fp
, const char *path
,
1238 u64 root_tree_bytenr
,
1239 u64 chunk_root_bytenr
,
1242 struct btrfs_fs_info
*fs_info
;
1243 struct btrfs_super_block
*disk_super
;
1244 struct btrfs_fs_devices
*fs_devices
= NULL
;
1245 struct extent_buffer
*eb
;
1248 unsigned sbflags
= SBREAD_DEFAULT
;
1251 sb_bytenr
= BTRFS_SUPER_INFO_OFFSET
;
1253 /* try to drop all the caches */
1254 if (posix_fadvise(fp
, 0, 0, POSIX_FADV_DONTNEED
))
1255 fprintf(stderr
, "Warning, could not drop caches\n");
1257 fs_info
= btrfs_new_fs_info(flags
& OPEN_CTREE_WRITES
, sb_bytenr
);
1259 fprintf(stderr
, "Failed to allocate memory for fs_info\n");
1262 if (flags
& OPEN_CTREE_RESTORE
)
1263 fs_info
->on_restoring
= 1;
1264 if (flags
& OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS
)
1265 fs_info
->suppress_check_block_errors
= 1;
1266 if (flags
& OPEN_CTREE_IGNORE_FSID_MISMATCH
)
1267 fs_info
->ignore_fsid_mismatch
= 1;
1268 if (flags
& OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR
)
1269 fs_info
->ignore_chunk_tree_error
= 1;
1271 if ((flags
& OPEN_CTREE_RECOVER_SUPER
)
1272 && (flags
& OPEN_CTREE_FS_PARTIAL
)) {
1274 "cannot open a partially created filesystem for recovery");
1278 if (flags
& OPEN_CTREE_FS_PARTIAL
)
1279 sbflags
= SBREAD_PARTIAL
;
1281 ret
= btrfs_scan_fs_devices(fp
, path
, &fs_devices
, sb_bytenr
, sbflags
,
1282 (flags
& OPEN_CTREE_NO_DEVICES
));
1286 fs_info
->fs_devices
= fs_devices
;
1287 if (flags
& OPEN_CTREE_WRITES
)
1292 if (flags
& OPEN_CTREE_EXCLUSIVE
)
1295 ret
= btrfs_open_devices(fs_devices
, oflags
);
1299 disk_super
= fs_info
->super_copy
;
1300 if (flags
& OPEN_CTREE_RECOVER_SUPER
)
1301 ret
= btrfs_read_dev_super(fs_devices
->latest_bdev
, disk_super
,
1302 sb_bytenr
, SBREAD_RECOVER
);
1304 ret
= btrfs_read_dev_super(fp
, disk_super
, sb_bytenr
,
1307 printk("No valid btrfs found\n");
1311 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_CHANGING_FSID
&&
1312 !fs_info
->ignore_fsid_mismatch
) {
1313 fprintf(stderr
, "ERROR: Filesystem UUID change in progress\n");
1317 memcpy(fs_info
->fsid
, &disk_super
->fsid
, BTRFS_FSID_SIZE
);
1319 ret
= btrfs_check_fs_compatibility(fs_info
->super_copy
,
1320 flags
& OPEN_CTREE_WRITES
);
1324 ret
= btrfs_setup_chunk_tree_and_device_map(fs_info
, chunk_root_bytenr
);
1328 /* Chunk tree root is unable to read, return directly */
1329 if (!fs_info
->chunk_root
)
1332 eb
= fs_info
->chunk_root
->node
;
1333 read_extent_buffer(eb
, fs_info
->chunk_tree_uuid
,
1334 btrfs_header_chunk_tree_uuid(eb
),
1337 ret
= btrfs_setup_all_roots(fs_info
, root_tree_bytenr
, flags
);
1338 if (ret
&& !(flags
& __OPEN_CTREE_RETURN_CHUNK_ROOT
) &&
1339 !fs_info
->ignore_chunk_tree_error
)
1345 btrfs_release_all_roots(fs_info
);
1346 btrfs_cleanup_all_caches(fs_info
);
1348 btrfs_close_devices(fs_devices
);
1350 btrfs_free_fs_info(fs_info
);
1354 struct btrfs_fs_info
*open_ctree_fs_info(const char *filename
,
1355 u64 sb_bytenr
, u64 root_tree_bytenr
,
1356 u64 chunk_root_bytenr
,
1361 struct btrfs_fs_info
*info
;
1362 int oflags
= O_RDWR
;
1365 ret
= stat(filename
, &st
);
1367 error("cannot stat '%s': %s", filename
, strerror(errno
));
1370 if (!(((st
.st_mode
& S_IFMT
) == S_IFREG
) || ((st
.st_mode
& S_IFMT
) == S_IFBLK
))) {
1371 error("not a regular file or block device: %s", filename
);
1375 if (!(flags
& OPEN_CTREE_WRITES
))
1378 fp
= open(filename
, oflags
);
1380 error("cannot open '%s': %s", filename
, strerror(errno
));
1383 info
= __open_ctree_fd(fp
, filename
, sb_bytenr
, root_tree_bytenr
,
1384 chunk_root_bytenr
, flags
);
1389 struct btrfs_root
*open_ctree(const char *filename
, u64 sb_bytenr
,
1392 struct btrfs_fs_info
*info
;
1394 /* This flags may not return fs_info with any valid root */
1395 BUG_ON(flags
& OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR
);
1396 info
= open_ctree_fs_info(filename
, sb_bytenr
, 0, 0, flags
);
1399 if (flags
& __OPEN_CTREE_RETURN_CHUNK_ROOT
)
1400 return info
->chunk_root
;
1401 return info
->fs_root
;
1404 struct btrfs_root
*open_ctree_fd(int fp
, const char *path
, u64 sb_bytenr
,
1407 struct btrfs_fs_info
*info
;
1409 /* This flags may not return fs_info with any valid root */
1410 BUG_ON(flags
& OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR
);
1411 info
= __open_ctree_fd(fp
, path
, sb_bytenr
, 0, 0, flags
);
1414 if (flags
& __OPEN_CTREE_RETURN_CHUNK_ROOT
)
1415 return info
->chunk_root
;
1416 return info
->fs_root
;
1420 * Check if the super is valid:
1421 * - nodesize/sectorsize - minimum, maximum, alignment
1422 * - tree block starts - alignment
1423 * - number of devices - something sane
1424 * - sys array size - maximum
1426 static int check_super(struct btrfs_super_block
*sb
, unsigned sbflags
)
1428 char result
[BTRFS_CSUM_SIZE
];
1433 if (btrfs_super_magic(sb
) != BTRFS_MAGIC
) {
1434 if (btrfs_super_magic(sb
) == BTRFS_MAGIC_PARTIAL
) {
1435 if (!(sbflags
& SBREAD_PARTIAL
)) {
1436 error("superblock magic doesn't match");
1442 csum_type
= btrfs_super_csum_type(sb
);
1443 if (csum_type
>= ARRAY_SIZE(btrfs_csum_sizes
)) {
1444 error("unsupported checksum algorithm %u", csum_type
);
1447 csum_size
= btrfs_csum_sizes
[csum_type
];
1450 crc
= btrfs_csum_data(NULL
, (char *)sb
+ BTRFS_CSUM_SIZE
, crc
,
1451 BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
1452 btrfs_csum_final(crc
, result
);
1454 if (memcmp(result
, sb
->csum
, csum_size
)) {
1455 error("superblock checksum mismatch");
1458 if (btrfs_super_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
1459 error("tree_root level too big: %d >= %d",
1460 btrfs_super_root_level(sb
), BTRFS_MAX_LEVEL
);
1463 if (btrfs_super_chunk_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
1464 error("chunk_root level too big: %d >= %d",
1465 btrfs_super_chunk_root_level(sb
), BTRFS_MAX_LEVEL
);
1468 if (btrfs_super_log_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
1469 error("log_root level too big: %d >= %d",
1470 btrfs_super_log_root_level(sb
), BTRFS_MAX_LEVEL
);
1474 if (!IS_ALIGNED(btrfs_super_root(sb
), 4096)) {
1475 error("tree_root block unaligned: %llu", btrfs_super_root(sb
));
1478 if (!IS_ALIGNED(btrfs_super_chunk_root(sb
), 4096)) {
1479 error("chunk_root block unaligned: %llu",
1480 btrfs_super_chunk_root(sb
));
1483 if (!IS_ALIGNED(btrfs_super_log_root(sb
), 4096)) {
1484 error("log_root block unaligned: %llu",
1485 btrfs_super_log_root(sb
));
1488 if (btrfs_super_nodesize(sb
) < 4096) {
1489 error("nodesize too small: %u < 4096",
1490 btrfs_super_nodesize(sb
));
1493 if (!IS_ALIGNED(btrfs_super_nodesize(sb
), 4096)) {
1494 error("nodesize unaligned: %u", btrfs_super_nodesize(sb
));
1497 if (btrfs_super_sectorsize(sb
) < 4096) {
1498 error("sectorsize too small: %u < 4096",
1499 btrfs_super_sectorsize(sb
));
1502 if (!IS_ALIGNED(btrfs_super_sectorsize(sb
), 4096)) {
1503 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb
));
1506 if (btrfs_super_total_bytes(sb
) == 0) {
1507 error("invalid total_bytes 0");
1510 if (btrfs_super_bytes_used(sb
) < 6 * btrfs_super_nodesize(sb
)) {
1511 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb
));
1514 if ((btrfs_super_stripesize(sb
) != 4096)
1515 && (btrfs_super_stripesize(sb
) != btrfs_super_sectorsize(sb
))) {
1516 error("invalid stripesize %u", btrfs_super_stripesize(sb
));
1520 if (memcmp(sb
->fsid
, sb
->dev_item
.fsid
, BTRFS_UUID_SIZE
) != 0) {
1521 char fsid
[BTRFS_UUID_UNPARSED_SIZE
];
1522 char dev_fsid
[BTRFS_UUID_UNPARSED_SIZE
];
1524 uuid_unparse(sb
->fsid
, fsid
);
1525 uuid_unparse(sb
->dev_item
.fsid
, dev_fsid
);
1526 error("dev_item UUID does not match fsid: %s != %s",
1532 * Hint to catch really bogus numbers, bitflips or so
1534 if (btrfs_super_num_devices(sb
) > (1UL << 31)) {
1535 warning("suspicious number of devices: %llu",
1536 btrfs_super_num_devices(sb
));
1539 if (btrfs_super_num_devices(sb
) == 0) {
1540 error("number of devices is 0");
1545 * Obvious sys_chunk_array corruptions, it must hold at least one key
1548 if (btrfs_super_sys_array_size(sb
) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
) {
1549 error("system chunk array too big %u > %u",
1550 btrfs_super_sys_array_size(sb
),
1551 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
);
1554 if (btrfs_super_sys_array_size(sb
) < sizeof(struct btrfs_disk_key
)
1555 + sizeof(struct btrfs_chunk
)) {
1556 error("system chunk array too small %u < %lu",
1557 btrfs_super_sys_array_size(sb
),
1558 sizeof(struct btrfs_disk_key
) +
1559 sizeof(struct btrfs_chunk
));
1566 error("superblock checksum matches but it has invalid members");
1570 int btrfs_read_dev_super(int fd
, struct btrfs_super_block
*sb
, u64 sb_bytenr
,
1573 u8 fsid
[BTRFS_FSID_SIZE
];
1574 int fsid_is_initialized
= 0;
1575 char tmp
[BTRFS_SUPER_INFO_SIZE
];
1576 struct btrfs_super_block
*buf
= (struct btrfs_super_block
*)tmp
;
1579 int max_super
= sbflags
& SBREAD_RECOVER
? BTRFS_SUPER_MIRROR_MAX
: 1;
1583 if (sb_bytenr
!= BTRFS_SUPER_INFO_OFFSET
) {
1584 ret
= pread64(fd
, buf
, BTRFS_SUPER_INFO_SIZE
, sb_bytenr
);
1585 if (ret
< BTRFS_SUPER_INFO_SIZE
)
1588 if (btrfs_super_bytenr(buf
) != sb_bytenr
)
1591 if (check_super(buf
, sbflags
))
1593 memcpy(sb
, buf
, BTRFS_SUPER_INFO_SIZE
);
1598 * we would like to check all the supers, but that would make
1599 * a btrfs mount succeed after a mkfs from a different FS.
1600 * So, we need to add a special mount option to scan for
1601 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1604 for (i
= 0; i
< max_super
; i
++) {
1605 bytenr
= btrfs_sb_offset(i
);
1606 ret
= pread64(fd
, buf
, BTRFS_SUPER_INFO_SIZE
, bytenr
);
1607 if (ret
< BTRFS_SUPER_INFO_SIZE
)
1610 if (btrfs_super_bytenr(buf
) != bytenr
)
1612 /* if magic is NULL, the device was removed */
1613 if (btrfs_super_magic(buf
) == 0 && i
== 0)
1615 if (check_super(buf
, sbflags
))
1618 if (!fsid_is_initialized
) {
1619 memcpy(fsid
, buf
->fsid
, sizeof(fsid
));
1620 fsid_is_initialized
= 1;
1621 } else if (memcmp(fsid
, buf
->fsid
, sizeof(fsid
))) {
1623 * the superblocks (the original one and
1624 * its backups) contain data of different
1625 * filesystems -> the super cannot be trusted
1630 if (btrfs_super_generation(buf
) > transid
) {
1631 memcpy(sb
, buf
, BTRFS_SUPER_INFO_SIZE
);
1632 transid
= btrfs_super_generation(buf
);
1636 return transid
> 0 ? 0 : -1;
1639 static int write_dev_supers(struct btrfs_root
*root
,
1640 struct btrfs_super_block
*sb
,
1641 struct btrfs_device
*device
)
1647 if (root
->fs_info
->super_bytenr
!= BTRFS_SUPER_INFO_OFFSET
) {
1648 btrfs_set_super_bytenr(sb
, root
->fs_info
->super_bytenr
);
1650 crc
= btrfs_csum_data(NULL
, (char *)sb
+ BTRFS_CSUM_SIZE
, crc
,
1651 BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
1652 btrfs_csum_final(crc
, (char *)&sb
->csum
[0]);
1655 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1656 * zero filled, we can use it directly
1658 ret
= pwrite64(device
->fd
, root
->fs_info
->super_copy
,
1659 BTRFS_SUPER_INFO_SIZE
,
1660 root
->fs_info
->super_bytenr
);
1661 if (ret
!= BTRFS_SUPER_INFO_SIZE
)
1666 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
1667 bytenr
= btrfs_sb_offset(i
);
1668 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
> device
->total_bytes
)
1671 btrfs_set_super_bytenr(sb
, bytenr
);
1674 crc
= btrfs_csum_data(NULL
, (char *)sb
+ BTRFS_CSUM_SIZE
, crc
,
1675 BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
1676 btrfs_csum_final(crc
, (char *)&sb
->csum
[0]);
1679 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1680 * zero filled, we can use it directly
1682 ret
= pwrite64(device
->fd
, root
->fs_info
->super_copy
,
1683 BTRFS_SUPER_INFO_SIZE
, bytenr
);
1684 if (ret
!= BTRFS_SUPER_INFO_SIZE
)
1692 fprintf(stderr
, "WARNING: failed to write all sb data\n");
1694 fprintf(stderr
, "WARNING: failed to write sb: %s\n",
1699 int write_all_supers(struct btrfs_root
*root
)
1701 struct list_head
*cur
;
1702 struct list_head
*head
= &root
->fs_info
->fs_devices
->devices
;
1703 struct btrfs_device
*dev
;
1704 struct btrfs_super_block
*sb
;
1705 struct btrfs_dev_item
*dev_item
;
1709 sb
= root
->fs_info
->super_copy
;
1710 dev_item
= &sb
->dev_item
;
1711 list_for_each(cur
, head
) {
1712 dev
= list_entry(cur
, struct btrfs_device
, dev_list
);
1713 if (!dev
->writeable
)
1716 btrfs_set_stack_device_generation(dev_item
, 0);
1717 btrfs_set_stack_device_type(dev_item
, dev
->type
);
1718 btrfs_set_stack_device_id(dev_item
, dev
->devid
);
1719 btrfs_set_stack_device_total_bytes(dev_item
, dev
->total_bytes
);
1720 btrfs_set_stack_device_bytes_used(dev_item
, dev
->bytes_used
);
1721 btrfs_set_stack_device_io_align(dev_item
, dev
->io_align
);
1722 btrfs_set_stack_device_io_width(dev_item
, dev
->io_width
);
1723 btrfs_set_stack_device_sector_size(dev_item
, dev
->sector_size
);
1724 memcpy(dev_item
->uuid
, dev
->uuid
, BTRFS_UUID_SIZE
);
1725 memcpy(dev_item
->fsid
, dev
->fs_devices
->fsid
, BTRFS_UUID_SIZE
);
1727 flags
= btrfs_super_flags(sb
);
1728 btrfs_set_super_flags(sb
, flags
| BTRFS_HEADER_FLAG_WRITTEN
);
1730 ret
= write_dev_supers(root
, sb
, dev
);
1736 int write_ctree_super(struct btrfs_trans_handle
*trans
,
1737 struct btrfs_root
*root
)
1740 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
1741 struct btrfs_root
*chunk_root
= root
->fs_info
->chunk_root
;
1743 if (root
->fs_info
->readonly
)
1746 btrfs_set_super_generation(root
->fs_info
->super_copy
,
1748 btrfs_set_super_root(root
->fs_info
->super_copy
,
1749 tree_root
->node
->start
);
1750 btrfs_set_super_root_level(root
->fs_info
->super_copy
,
1751 btrfs_header_level(tree_root
->node
));
1752 btrfs_set_super_chunk_root(root
->fs_info
->super_copy
,
1753 chunk_root
->node
->start
);
1754 btrfs_set_super_chunk_root_level(root
->fs_info
->super_copy
,
1755 btrfs_header_level(chunk_root
->node
));
1756 btrfs_set_super_chunk_root_generation(root
->fs_info
->super_copy
,
1757 btrfs_header_generation(chunk_root
->node
));
1759 ret
= write_all_supers(root
);
1761 fprintf(stderr
, "failed to write new super block err %d\n", ret
);
1765 int close_ctree_fs_info(struct btrfs_fs_info
*fs_info
)
1768 struct btrfs_trans_handle
*trans
;
1769 struct btrfs_root
*root
= fs_info
->tree_root
;
1771 if (fs_info
->last_trans_committed
!=
1772 fs_info
->generation
) {
1774 trans
= btrfs_start_transaction(root
, 1);
1775 btrfs_commit_transaction(trans
, root
);
1776 trans
= btrfs_start_transaction(root
, 1);
1777 ret
= commit_tree_roots(trans
, fs_info
);
1779 ret
= __commit_transaction(trans
, root
);
1781 write_ctree_super(trans
, root
);
1782 btrfs_free_transaction(root
, trans
);
1785 if (fs_info
->finalize_on_close
) {
1786 btrfs_set_super_magic(fs_info
->super_copy
, BTRFS_MAGIC
);
1787 root
->fs_info
->finalize_on_close
= 0;
1788 ret
= write_all_supers(root
);
1791 "failed to write new super block err %d\n", ret
);
1793 btrfs_free_block_groups(fs_info
);
1795 free_fs_roots_tree(&fs_info
->fs_root_tree
);
1797 btrfs_release_all_roots(fs_info
);
1798 btrfs_close_devices(fs_info
->fs_devices
);
1799 btrfs_cleanup_all_caches(fs_info
);
1800 btrfs_free_fs_info(fs_info
);
1804 int clean_tree_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1805 struct extent_buffer
*eb
)
1807 return clear_extent_buffer_dirty(eb
);
1810 int wait_on_tree_block_writeback(struct btrfs_root
*root
,
1811 struct extent_buffer
*eb
)
1816 void btrfs_mark_buffer_dirty(struct extent_buffer
*eb
)
1818 set_extent_buffer_dirty(eb
);
1821 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
)
1825 ret
= extent_buffer_uptodate(buf
);
1829 ret
= verify_parent_transid(buf
->tree
, buf
, parent_transid
, 1);
1833 int btrfs_set_buffer_uptodate(struct extent_buffer
*eb
)
1835 return set_extent_buffer_uptodate(eb
);