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(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_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 (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(u32 nodesize
, u32 leafsize
, u32 sectorsize
,
480 u32 stripesize
, struct btrfs_root
*root
,
481 struct btrfs_fs_info
*fs_info
, u64 objectid
)
484 root
->commit_root
= NULL
;
485 root
->sectorsize
= sectorsize
;
486 root
->nodesize
= nodesize
;
487 root
->leafsize
= leafsize
;
488 root
->stripesize
= stripesize
;
490 root
->track_dirty
= 0;
492 root
->fs_info
= fs_info
;
493 root
->objectid
= objectid
;
494 root
->last_trans
= 0;
495 root
->last_inode_alloc
= 0;
497 INIT_LIST_HEAD(&root
->dirty_list
);
498 INIT_LIST_HEAD(&root
->orphan_data_extents
);
499 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
500 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
501 root
->root_key
.objectid
= objectid
;
504 static int update_cowonly_root(struct btrfs_trans_handle
*trans
,
505 struct btrfs_root
*root
)
509 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
511 btrfs_write_dirty_block_groups(trans
, root
);
513 old_root_bytenr
= btrfs_root_bytenr(&root
->root_item
);
514 if (old_root_bytenr
== root
->node
->start
)
516 btrfs_set_root_bytenr(&root
->root_item
,
518 btrfs_set_root_generation(&root
->root_item
,
520 root
->root_item
.level
= btrfs_header_level(root
->node
);
521 ret
= btrfs_update_root(trans
, tree_root
,
525 btrfs_write_dirty_block_groups(trans
, root
);
530 static int commit_tree_roots(struct btrfs_trans_handle
*trans
,
531 struct btrfs_fs_info
*fs_info
)
533 struct btrfs_root
*root
;
534 struct list_head
*next
;
535 struct extent_buffer
*eb
;
538 if (fs_info
->readonly
)
541 eb
= fs_info
->tree_root
->node
;
542 extent_buffer_get(eb
);
543 ret
= btrfs_cow_block(trans
, fs_info
->tree_root
, eb
, NULL
, 0, &eb
);
544 free_extent_buffer(eb
);
548 while(!list_empty(&fs_info
->dirty_cowonly_roots
)) {
549 next
= fs_info
->dirty_cowonly_roots
.next
;
551 root
= list_entry(next
, struct btrfs_root
, dirty_list
);
552 update_cowonly_root(trans
, root
);
553 free_extent_buffer(root
->commit_root
);
554 root
->commit_root
= NULL
;
560 static int __commit_transaction(struct btrfs_trans_handle
*trans
,
561 struct btrfs_root
*root
)
565 struct extent_buffer
*eb
;
566 struct extent_io_tree
*tree
= &root
->fs_info
->extent_cache
;
570 ret
= find_first_extent_bit(tree
, 0, &start
, &end
,
574 while(start
<= end
) {
575 eb
= find_first_extent_buffer(tree
, start
);
576 BUG_ON(!eb
|| eb
->start
!= start
);
577 ret
= write_tree_block(trans
, root
, eb
);
580 clear_extent_buffer_dirty(eb
);
581 free_extent_buffer(eb
);
587 int btrfs_commit_transaction(struct btrfs_trans_handle
*trans
,
588 struct btrfs_root
*root
)
590 u64 transid
= trans
->transid
;
592 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
594 if (root
->commit_root
== root
->node
)
596 if (root
== root
->fs_info
->tree_root
)
598 if (root
== root
->fs_info
->chunk_root
)
601 free_extent_buffer(root
->commit_root
);
602 root
->commit_root
= NULL
;
604 btrfs_set_root_bytenr(&root
->root_item
, root
->node
->start
);
605 btrfs_set_root_generation(&root
->root_item
, trans
->transid
);
606 root
->root_item
.level
= btrfs_header_level(root
->node
);
607 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
608 &root
->root_key
, &root
->root_item
);
611 ret
= commit_tree_roots(trans
, fs_info
);
613 ret
= __commit_transaction(trans
, root
);
615 write_ctree_super(trans
, root
);
616 btrfs_finish_extent_commit(trans
, fs_info
->extent_root
,
617 &fs_info
->pinned_extents
);
619 free_extent_buffer(root
->commit_root
);
620 root
->commit_root
= NULL
;
621 fs_info
->running_transaction
= NULL
;
622 fs_info
->last_trans_committed
= transid
;
626 static int find_and_setup_root(struct btrfs_root
*tree_root
,
627 struct btrfs_fs_info
*fs_info
,
628 u64 objectid
, struct btrfs_root
*root
)
634 btrfs_setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
635 tree_root
->sectorsize
, tree_root
->stripesize
,
636 root
, fs_info
, objectid
);
637 ret
= btrfs_find_last_root(tree_root
, objectid
,
638 &root
->root_item
, &root
->root_key
);
642 blocksize
= root
->nodesize
;
643 generation
= btrfs_root_generation(&root
->root_item
);
644 root
->node
= read_tree_block(root
, btrfs_root_bytenr(&root
->root_item
),
645 blocksize
, generation
);
646 if (!extent_buffer_uptodate(root
->node
))
652 static int find_and_setup_log_root(struct btrfs_root
*tree_root
,
653 struct btrfs_fs_info
*fs_info
,
654 struct btrfs_super_block
*disk_super
)
657 u64 blocknr
= btrfs_super_log_root(disk_super
);
658 struct btrfs_root
*log_root
= malloc(sizeof(struct btrfs_root
));
668 blocksize
= tree_root
->nodesize
;
670 btrfs_setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
671 tree_root
->sectorsize
, tree_root
->stripesize
,
672 log_root
, fs_info
, BTRFS_TREE_LOG_OBJECTID
);
674 log_root
->node
= read_tree_block(tree_root
, blocknr
,
676 btrfs_super_generation(disk_super
) + 1);
678 fs_info
->log_root_tree
= log_root
;
680 if (!extent_buffer_uptodate(log_root
->node
)) {
681 free_extent_buffer(log_root
->node
);
683 fs_info
->log_root_tree
= NULL
;
690 int btrfs_free_fs_root(struct btrfs_root
*root
)
693 free_extent_buffer(root
->node
);
694 if (root
->commit_root
)
695 free_extent_buffer(root
->commit_root
);
700 static void __free_fs_root(struct rb_node
*node
)
702 struct btrfs_root
*root
;
704 root
= container_of(node
, struct btrfs_root
, rb_node
);
705 btrfs_free_fs_root(root
);
708 FREE_RB_BASED_TREE(fs_roots
, __free_fs_root
);
710 struct btrfs_root
*btrfs_read_fs_root_no_cache(struct btrfs_fs_info
*fs_info
,
711 struct btrfs_key
*location
)
713 struct btrfs_root
*root
;
714 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
715 struct btrfs_path
*path
;
716 struct extent_buffer
*l
;
721 root
= calloc(1, sizeof(*root
));
723 return ERR_PTR(-ENOMEM
);
724 if (location
->offset
== (u64
)-1) {
725 ret
= find_and_setup_root(tree_root
, fs_info
,
726 location
->objectid
, root
);
734 btrfs_setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
735 tree_root
->sectorsize
, tree_root
->stripesize
,
736 root
, fs_info
, location
->objectid
);
738 path
= btrfs_alloc_path();
741 return ERR_PTR(-ENOMEM
);
744 ret
= btrfs_search_slot(NULL
, tree_root
, location
, path
, 0, 0);
751 read_extent_buffer(l
, &root
->root_item
,
752 btrfs_item_ptr_offset(l
, path
->slots
[0]),
753 sizeof(root
->root_item
));
754 memcpy(&root
->root_key
, location
, sizeof(*location
));
757 btrfs_free_path(path
);
762 generation
= btrfs_root_generation(&root
->root_item
);
763 blocksize
= root
->nodesize
;
764 root
->node
= read_tree_block(root
, btrfs_root_bytenr(&root
->root_item
),
765 blocksize
, generation
);
766 if (!extent_buffer_uptodate(root
->node
)) {
768 return ERR_PTR(-EIO
);
775 static int btrfs_fs_roots_compare_objectids(struct rb_node
*node
,
778 u64 objectid
= *((u64
*)data
);
779 struct btrfs_root
*root
;
781 root
= rb_entry(node
, struct btrfs_root
, rb_node
);
782 if (objectid
> root
->objectid
)
784 else if (objectid
< root
->objectid
)
790 static int btrfs_fs_roots_compare_roots(struct rb_node
*node1
,
791 struct rb_node
*node2
)
793 struct btrfs_root
*root
;
795 root
= rb_entry(node2
, struct btrfs_root
, rb_node
);
796 return btrfs_fs_roots_compare_objectids(node1
, (void *)&root
->objectid
);
799 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_fs_info
*fs_info
,
800 struct btrfs_key
*location
)
802 struct btrfs_root
*root
;
803 struct rb_node
*node
;
805 u64 objectid
= location
->objectid
;
807 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
808 return fs_info
->tree_root
;
809 if (location
->objectid
== BTRFS_EXTENT_TREE_OBJECTID
)
810 return fs_info
->extent_root
;
811 if (location
->objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
812 return fs_info
->chunk_root
;
813 if (location
->objectid
== BTRFS_DEV_TREE_OBJECTID
)
814 return fs_info
->dev_root
;
815 if (location
->objectid
== BTRFS_CSUM_TREE_OBJECTID
)
816 return fs_info
->csum_root
;
817 if (location
->objectid
== BTRFS_QUOTA_TREE_OBJECTID
)
818 return fs_info
->quota_root
;
820 BUG_ON(location
->objectid
== BTRFS_TREE_RELOC_OBJECTID
||
821 location
->offset
!= (u64
)-1);
823 node
= rb_search(&fs_info
->fs_root_tree
, (void *)&objectid
,
824 btrfs_fs_roots_compare_objectids
, NULL
);
826 return container_of(node
, struct btrfs_root
, rb_node
);
828 root
= btrfs_read_fs_root_no_cache(fs_info
, location
);
832 ret
= rb_insert(&fs_info
->fs_root_tree
, &root
->rb_node
,
833 btrfs_fs_roots_compare_roots
);
838 void btrfs_free_fs_info(struct btrfs_fs_info
*fs_info
)
840 free(fs_info
->tree_root
);
841 free(fs_info
->extent_root
);
842 free(fs_info
->chunk_root
);
843 free(fs_info
->dev_root
);
844 free(fs_info
->csum_root
);
845 free(fs_info
->quota_root
);
846 free(fs_info
->free_space_root
);
847 free(fs_info
->super_copy
);
848 free(fs_info
->log_root_tree
);
852 struct btrfs_fs_info
*btrfs_new_fs_info(int writable
, u64 sb_bytenr
)
854 struct btrfs_fs_info
*fs_info
;
856 fs_info
= calloc(1, sizeof(struct btrfs_fs_info
));
860 fs_info
->tree_root
= calloc(1, sizeof(struct btrfs_root
));
861 fs_info
->extent_root
= calloc(1, sizeof(struct btrfs_root
));
862 fs_info
->chunk_root
= calloc(1, sizeof(struct btrfs_root
));
863 fs_info
->dev_root
= calloc(1, sizeof(struct btrfs_root
));
864 fs_info
->csum_root
= calloc(1, sizeof(struct btrfs_root
));
865 fs_info
->quota_root
= calloc(1, sizeof(struct btrfs_root
));
866 fs_info
->free_space_root
= calloc(1, sizeof(struct btrfs_root
));
867 fs_info
->super_copy
= calloc(1, BTRFS_SUPER_INFO_SIZE
);
869 if (!fs_info
->tree_root
|| !fs_info
->extent_root
||
870 !fs_info
->chunk_root
|| !fs_info
->dev_root
||
871 !fs_info
->csum_root
|| !fs_info
->quota_root
||
872 !fs_info
->free_space_root
|| !fs_info
->super_copy
)
875 extent_io_tree_init(&fs_info
->extent_cache
);
876 extent_io_tree_init(&fs_info
->free_space_cache
);
877 extent_io_tree_init(&fs_info
->block_group_cache
);
878 extent_io_tree_init(&fs_info
->pinned_extents
);
879 extent_io_tree_init(&fs_info
->pending_del
);
880 extent_io_tree_init(&fs_info
->extent_ins
);
881 fs_info
->excluded_extents
= NULL
;
883 fs_info
->fs_root_tree
= RB_ROOT
;
884 cache_tree_init(&fs_info
->mapping_tree
.cache_tree
);
886 mutex_init(&fs_info
->fs_mutex
);
887 INIT_LIST_HEAD(&fs_info
->dirty_cowonly_roots
);
888 INIT_LIST_HEAD(&fs_info
->space_info
);
889 INIT_LIST_HEAD(&fs_info
->recow_ebs
);
892 fs_info
->readonly
= 1;
894 fs_info
->super_bytenr
= sb_bytenr
;
895 fs_info
->data_alloc_profile
= (u64
)-1;
896 fs_info
->metadata_alloc_profile
= (u64
)-1;
897 fs_info
->system_alloc_profile
= fs_info
->metadata_alloc_profile
;
900 btrfs_free_fs_info(fs_info
);
904 int btrfs_check_fs_compatibility(struct btrfs_super_block
*sb
,
909 features
= btrfs_super_incompat_flags(sb
) &
910 ~BTRFS_FEATURE_INCOMPAT_SUPP
;
912 printk("couldn't open because of unsupported "
913 "option features (%Lx).\n",
914 (unsigned long long)features
);
918 features
= btrfs_super_incompat_flags(sb
);
919 if (!(features
& BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
)) {
920 features
|= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
;
921 btrfs_set_super_incompat_flags(sb
, features
);
924 features
= btrfs_super_compat_ro_flags(sb
);
925 if (flags
& OPEN_CTREE_WRITES
) {
926 if (flags
& OPEN_CTREE_INVALIDATE_FST
) {
927 /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
928 features
&= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID
;
929 btrfs_set_super_compat_ro_flags(sb
, features
);
930 /* ... and ignore the free space tree bit. */
931 features
&= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE
;
933 if (features
& ~BTRFS_FEATURE_COMPAT_RO_SUPP
) {
934 printk("couldn't open RDWR because of unsupported "
935 "option features (%Lx).\n",
936 (unsigned long long)features
);
944 static int find_best_backup_root(struct btrfs_super_block
*super
)
946 struct btrfs_root_backup
*backup
;
947 u64 orig_gen
= btrfs_super_generation(super
);
952 for (i
= 0; i
< BTRFS_NUM_BACKUP_ROOTS
; i
++) {
953 backup
= super
->super_roots
+ i
;
954 if (btrfs_backup_tree_root_gen(backup
) != orig_gen
&&
955 btrfs_backup_tree_root_gen(backup
) > gen
) {
957 gen
= btrfs_backup_tree_root_gen(backup
);
963 static int setup_root_or_create_block(struct btrfs_fs_info
*fs_info
,
965 struct btrfs_root
*info_root
,
966 u64 objectid
, char *str
)
968 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
969 struct btrfs_root
*root
= fs_info
->tree_root
;
970 u32 nodesize
= btrfs_super_nodesize(sb
);
973 ret
= find_and_setup_root(root
, fs_info
, objectid
, info_root
);
975 printk("Couldn't setup %s tree\n", str
);
976 if (!(flags
& OPEN_CTREE_PARTIAL
))
979 * Need a blank node here just so we don't screw up in the
980 * million of places that assume a root has a valid ->node
983 btrfs_find_create_tree_block(fs_info
, 0, nodesize
);
984 if (!info_root
->node
)
986 clear_extent_buffer_uptodate(info_root
->node
);
992 int btrfs_setup_all_roots(struct btrfs_fs_info
*fs_info
, u64 root_tree_bytenr
,
995 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
996 struct btrfs_root
*root
;
997 struct btrfs_key key
;
1006 nodesize
= btrfs_super_nodesize(sb
);
1007 leafsize
= btrfs_super_leafsize(sb
);
1008 sectorsize
= btrfs_super_sectorsize(sb
);
1009 stripesize
= btrfs_super_stripesize(sb
);
1011 root
= fs_info
->tree_root
;
1012 btrfs_setup_root(nodesize
, leafsize
, sectorsize
, stripesize
,
1013 root
, fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
1014 blocksize
= root
->nodesize
;
1015 generation
= btrfs_super_generation(sb
);
1017 if (!root_tree_bytenr
&& !(flags
& OPEN_CTREE_BACKUP_ROOT
)) {
1018 root_tree_bytenr
= btrfs_super_root(sb
);
1019 } else if (flags
& OPEN_CTREE_BACKUP_ROOT
) {
1020 struct btrfs_root_backup
*backup
;
1021 int index
= find_best_backup_root(sb
);
1022 if (index
>= BTRFS_NUM_BACKUP_ROOTS
) {
1023 fprintf(stderr
, "Invalid backup root number\n");
1026 backup
= fs_info
->super_copy
->super_roots
+ index
;
1027 root_tree_bytenr
= btrfs_backup_tree_root(backup
);
1028 generation
= btrfs_backup_tree_root_gen(backup
);
1031 root
->node
= read_tree_block(root
, root_tree_bytenr
, blocksize
,
1033 if (!extent_buffer_uptodate(root
->node
)) {
1034 fprintf(stderr
, "Couldn't read tree root\n");
1038 ret
= setup_root_or_create_block(fs_info
, flags
, fs_info
->extent_root
,
1039 BTRFS_EXTENT_TREE_OBJECTID
, "extent");
1042 fs_info
->extent_root
->track_dirty
= 1;
1044 ret
= find_and_setup_root(root
, fs_info
, BTRFS_DEV_TREE_OBJECTID
,
1047 printk("Couldn't setup device tree\n");
1050 fs_info
->dev_root
->track_dirty
= 1;
1052 ret
= setup_root_or_create_block(fs_info
, flags
, fs_info
->csum_root
,
1053 BTRFS_CSUM_TREE_OBJECTID
, "csum");
1056 fs_info
->csum_root
->track_dirty
= 1;
1058 ret
= find_and_setup_root(root
, fs_info
, BTRFS_QUOTA_TREE_OBJECTID
,
1059 fs_info
->quota_root
);
1061 fs_info
->quota_enabled
= 1;
1063 if (btrfs_fs_compat_ro(fs_info
, FREE_SPACE_TREE
)) {
1064 ret
= find_and_setup_root(root
, fs_info
, BTRFS_FREE_SPACE_TREE_OBJECTID
,
1065 fs_info
->free_space_root
);
1067 printk("Couldn't read free space tree\n");
1070 fs_info
->free_space_root
->track_dirty
= 1;
1073 ret
= find_and_setup_log_root(root
, fs_info
, sb
);
1075 printk("Couldn't setup log root tree\n");
1076 if (!(flags
& OPEN_CTREE_PARTIAL
))
1080 fs_info
->generation
= generation
;
1081 fs_info
->last_trans_committed
= generation
;
1082 if (extent_buffer_uptodate(fs_info
->extent_root
->node
) &&
1083 !(flags
& OPEN_CTREE_NO_BLOCK_GROUPS
))
1084 btrfs_read_block_groups(fs_info
->tree_root
);
1086 key
.objectid
= BTRFS_FS_TREE_OBJECTID
;
1087 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1088 key
.offset
= (u64
)-1;
1089 fs_info
->fs_root
= btrfs_read_fs_root(fs_info
, &key
);
1091 if (IS_ERR(fs_info
->fs_root
))
1096 void btrfs_release_all_roots(struct btrfs_fs_info
*fs_info
)
1098 if (fs_info
->free_space_root
)
1099 free_extent_buffer(fs_info
->free_space_root
->node
);
1100 if (fs_info
->quota_root
)
1101 free_extent_buffer(fs_info
->quota_root
->node
);
1102 if (fs_info
->csum_root
)
1103 free_extent_buffer(fs_info
->csum_root
->node
);
1104 if (fs_info
->dev_root
)
1105 free_extent_buffer(fs_info
->dev_root
->node
);
1106 if (fs_info
->extent_root
)
1107 free_extent_buffer(fs_info
->extent_root
->node
);
1108 if (fs_info
->tree_root
)
1109 free_extent_buffer(fs_info
->tree_root
->node
);
1110 if (fs_info
->log_root_tree
)
1111 free_extent_buffer(fs_info
->log_root_tree
->node
);
1112 if (fs_info
->chunk_root
)
1113 free_extent_buffer(fs_info
->chunk_root
->node
);
1116 static void free_map_lookup(struct cache_extent
*ce
)
1118 struct map_lookup
*map
;
1120 map
= container_of(ce
, struct map_lookup
, ce
);
1124 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache
, free_map_lookup
);
1126 void btrfs_cleanup_all_caches(struct btrfs_fs_info
*fs_info
)
1128 while (!list_empty(&fs_info
->recow_ebs
)) {
1129 struct extent_buffer
*eb
;
1130 eb
= list_first_entry(&fs_info
->recow_ebs
,
1131 struct extent_buffer
, recow
);
1132 list_del_init(&eb
->recow
);
1133 free_extent_buffer(eb
);
1135 free_mapping_cache_tree(&fs_info
->mapping_tree
.cache_tree
);
1136 extent_io_tree_cleanup(&fs_info
->extent_cache
);
1137 extent_io_tree_cleanup(&fs_info
->free_space_cache
);
1138 extent_io_tree_cleanup(&fs_info
->block_group_cache
);
1139 extent_io_tree_cleanup(&fs_info
->pinned_extents
);
1140 extent_io_tree_cleanup(&fs_info
->pending_del
);
1141 extent_io_tree_cleanup(&fs_info
->extent_ins
);
1144 int btrfs_scan_fs_devices(int fd
, const char *path
,
1145 struct btrfs_fs_devices
**fs_devices
,
1146 u64 sb_bytenr
, unsigned sbflags
,
1154 sb_bytenr
= BTRFS_SUPER_INFO_OFFSET
;
1156 seek_ret
= lseek(fd
, 0, SEEK_END
);
1160 dev_size
= seek_ret
;
1161 lseek(fd
, 0, SEEK_SET
);
1162 if (sb_bytenr
> dev_size
) {
1163 error("superblock bytenr %llu is larger than device size %llu",
1164 (unsigned long long)sb_bytenr
,
1165 (unsigned long long)dev_size
);
1169 ret
= btrfs_scan_one_device(fd
, path
, fs_devices
,
1170 &total_devs
, sb_bytenr
, sbflags
);
1172 fprintf(stderr
, "No valid Btrfs found on %s\n", path
);
1176 if (!skip_devices
&& total_devs
!= 1) {
1177 ret
= btrfs_scan_devices();
1184 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info
*fs_info
,
1185 u64 chunk_root_bytenr
)
1187 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
1196 nodesize
= btrfs_super_nodesize(sb
);
1197 leafsize
= btrfs_super_leafsize(sb
);
1198 sectorsize
= btrfs_super_sectorsize(sb
);
1199 stripesize
= btrfs_super_stripesize(sb
);
1201 btrfs_setup_root(nodesize
, leafsize
, sectorsize
, stripesize
,
1202 fs_info
->chunk_root
, fs_info
, BTRFS_CHUNK_TREE_OBJECTID
);
1204 ret
= btrfs_read_sys_array(fs_info
->chunk_root
);
1208 blocksize
= fs_info
->chunk_root
->nodesize
;
1209 generation
= btrfs_super_chunk_root_generation(sb
);
1211 if (chunk_root_bytenr
&& !IS_ALIGNED(chunk_root_bytenr
,
1212 btrfs_super_sectorsize(sb
))) {
1213 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1214 chunk_root_bytenr
, btrfs_super_sectorsize(sb
));
1215 chunk_root_bytenr
= 0;
1218 if (!chunk_root_bytenr
)
1219 chunk_root_bytenr
= btrfs_super_chunk_root(sb
);
1223 fs_info
->chunk_root
->node
= read_tree_block(fs_info
->chunk_root
,
1225 blocksize
, generation
);
1226 if (!extent_buffer_uptodate(fs_info
->chunk_root
->node
)) {
1227 if (fs_info
->ignore_chunk_tree_error
) {
1228 warning("cannot read chunk root, continue anyway");
1229 fs_info
->chunk_root
= NULL
;
1232 error("cannot read chunk root");
1237 if (!(btrfs_super_flags(sb
) & BTRFS_SUPER_FLAG_METADUMP
)) {
1238 ret
= btrfs_read_chunk_tree(fs_info
->chunk_root
);
1240 fprintf(stderr
, "Couldn't read chunk tree\n");
1247 static struct btrfs_fs_info
*__open_ctree_fd(int fp
, const char *path
,
1249 u64 root_tree_bytenr
,
1250 u64 chunk_root_bytenr
,
1253 struct btrfs_fs_info
*fs_info
;
1254 struct btrfs_super_block
*disk_super
;
1255 struct btrfs_fs_devices
*fs_devices
= NULL
;
1256 struct extent_buffer
*eb
;
1259 unsigned sbflags
= SBREAD_DEFAULT
;
1262 sb_bytenr
= BTRFS_SUPER_INFO_OFFSET
;
1264 /* try to drop all the caches */
1265 if (posix_fadvise(fp
, 0, 0, POSIX_FADV_DONTNEED
))
1266 fprintf(stderr
, "Warning, could not drop caches\n");
1268 fs_info
= btrfs_new_fs_info(flags
& OPEN_CTREE_WRITES
, sb_bytenr
);
1270 fprintf(stderr
, "Failed to allocate memory for fs_info\n");
1273 if (flags
& OPEN_CTREE_RESTORE
)
1274 fs_info
->on_restoring
= 1;
1275 if (flags
& OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS
)
1276 fs_info
->suppress_check_block_errors
= 1;
1277 if (flags
& OPEN_CTREE_IGNORE_FSID_MISMATCH
)
1278 fs_info
->ignore_fsid_mismatch
= 1;
1279 if (flags
& OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR
)
1280 fs_info
->ignore_chunk_tree_error
= 1;
1282 if ((flags
& OPEN_CTREE_RECOVER_SUPER
)
1283 && (flags
& OPEN_CTREE_FS_PARTIAL
)) {
1285 "cannot open a partially created filesystem for recovery");
1289 if (flags
& OPEN_CTREE_FS_PARTIAL
)
1290 sbflags
= SBREAD_PARTIAL
;
1292 ret
= btrfs_scan_fs_devices(fp
, path
, &fs_devices
, sb_bytenr
, sbflags
,
1293 (flags
& OPEN_CTREE_NO_DEVICES
));
1297 fs_info
->fs_devices
= fs_devices
;
1298 if (flags
& OPEN_CTREE_WRITES
)
1303 if (flags
& OPEN_CTREE_EXCLUSIVE
)
1306 ret
= btrfs_open_devices(fs_devices
, oflags
);
1310 disk_super
= fs_info
->super_copy
;
1311 if (flags
& OPEN_CTREE_RECOVER_SUPER
)
1312 ret
= btrfs_read_dev_super(fs_devices
->latest_bdev
, disk_super
,
1313 sb_bytenr
, SBREAD_RECOVER
);
1315 ret
= btrfs_read_dev_super(fp
, disk_super
, sb_bytenr
,
1318 printk("No valid btrfs found\n");
1322 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_CHANGING_FSID
&&
1323 !fs_info
->ignore_fsid_mismatch
) {
1324 fprintf(stderr
, "ERROR: Filesystem UUID change in progress\n");
1328 memcpy(fs_info
->fsid
, &disk_super
->fsid
, BTRFS_FSID_SIZE
);
1330 ret
= btrfs_check_fs_compatibility(fs_info
->super_copy
, flags
);
1334 ret
= btrfs_setup_chunk_tree_and_device_map(fs_info
, chunk_root_bytenr
);
1338 /* Chunk tree root is unable to read, return directly */
1339 if (!fs_info
->chunk_root
)
1342 eb
= fs_info
->chunk_root
->node
;
1343 read_extent_buffer(eb
, fs_info
->chunk_tree_uuid
,
1344 btrfs_header_chunk_tree_uuid(eb
),
1347 ret
= btrfs_setup_all_roots(fs_info
, root_tree_bytenr
, flags
);
1348 if (ret
&& !(flags
& __OPEN_CTREE_RETURN_CHUNK_ROOT
) &&
1349 !fs_info
->ignore_chunk_tree_error
)
1355 btrfs_release_all_roots(fs_info
);
1356 btrfs_cleanup_all_caches(fs_info
);
1358 btrfs_close_devices(fs_devices
);
1360 btrfs_free_fs_info(fs_info
);
1364 struct btrfs_fs_info
*open_ctree_fs_info(const char *filename
,
1365 u64 sb_bytenr
, u64 root_tree_bytenr
,
1366 u64 chunk_root_bytenr
,
1371 struct btrfs_fs_info
*info
;
1372 int oflags
= O_RDWR
;
1375 ret
= stat(filename
, &st
);
1377 error("cannot stat '%s': %s", filename
, strerror(errno
));
1380 if (!(((st
.st_mode
& S_IFMT
) == S_IFREG
) || ((st
.st_mode
& S_IFMT
) == S_IFBLK
))) {
1381 error("not a regular file or block device: %s", filename
);
1385 if (!(flags
& OPEN_CTREE_WRITES
))
1388 fp
= open(filename
, oflags
);
1390 error("cannot open '%s': %s", filename
, strerror(errno
));
1393 info
= __open_ctree_fd(fp
, filename
, sb_bytenr
, root_tree_bytenr
,
1394 chunk_root_bytenr
, flags
);
1399 struct btrfs_root
*open_ctree(const char *filename
, u64 sb_bytenr
,
1402 struct btrfs_fs_info
*info
;
1404 /* This flags may not return fs_info with any valid root */
1405 BUG_ON(flags
& OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR
);
1406 info
= open_ctree_fs_info(filename
, sb_bytenr
, 0, 0, flags
);
1409 if (flags
& __OPEN_CTREE_RETURN_CHUNK_ROOT
)
1410 return info
->chunk_root
;
1411 return info
->fs_root
;
1414 struct btrfs_root
*open_ctree_fd(int fp
, const char *path
, u64 sb_bytenr
,
1417 struct btrfs_fs_info
*info
;
1419 /* This flags may not return fs_info with any valid root */
1420 if (flags
& OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR
) {
1421 error("invalid open_ctree flags: 0x%llx",
1422 (unsigned long long)flags
);
1425 info
= __open_ctree_fd(fp
, path
, sb_bytenr
, 0, 0, flags
);
1428 if (flags
& __OPEN_CTREE_RETURN_CHUNK_ROOT
)
1429 return info
->chunk_root
;
1430 return info
->fs_root
;
1434 * Check if the super is valid:
1435 * - nodesize/sectorsize - minimum, maximum, alignment
1436 * - tree block starts - alignment
1437 * - number of devices - something sane
1438 * - sys array size - maximum
1440 static int check_super(struct btrfs_super_block
*sb
, unsigned sbflags
)
1442 u8 result
[BTRFS_CSUM_SIZE
];
1447 if (btrfs_super_magic(sb
) != BTRFS_MAGIC
) {
1448 if (btrfs_super_magic(sb
) == BTRFS_MAGIC_PARTIAL
) {
1449 if (!(sbflags
& SBREAD_PARTIAL
)) {
1450 error("superblock magic doesn't match");
1456 csum_type
= btrfs_super_csum_type(sb
);
1457 if (csum_type
>= ARRAY_SIZE(btrfs_csum_sizes
)) {
1458 error("unsupported checksum algorithm %u", csum_type
);
1461 csum_size
= btrfs_csum_sizes
[csum_type
];
1464 crc
= btrfs_csum_data((char *)sb
+ BTRFS_CSUM_SIZE
, crc
,
1465 BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
1466 btrfs_csum_final(crc
, result
);
1468 if (memcmp(result
, sb
->csum
, csum_size
)) {
1469 error("superblock checksum mismatch");
1472 if (btrfs_super_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
1473 error("tree_root level too big: %d >= %d",
1474 btrfs_super_root_level(sb
), BTRFS_MAX_LEVEL
);
1477 if (btrfs_super_chunk_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
1478 error("chunk_root level too big: %d >= %d",
1479 btrfs_super_chunk_root_level(sb
), BTRFS_MAX_LEVEL
);
1482 if (btrfs_super_log_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
1483 error("log_root level too big: %d >= %d",
1484 btrfs_super_log_root_level(sb
), BTRFS_MAX_LEVEL
);
1488 if (!IS_ALIGNED(btrfs_super_root(sb
), 4096)) {
1489 error("tree_root block unaligned: %llu", btrfs_super_root(sb
));
1492 if (!IS_ALIGNED(btrfs_super_chunk_root(sb
), 4096)) {
1493 error("chunk_root block unaligned: %llu",
1494 btrfs_super_chunk_root(sb
));
1497 if (!IS_ALIGNED(btrfs_super_log_root(sb
), 4096)) {
1498 error("log_root block unaligned: %llu",
1499 btrfs_super_log_root(sb
));
1502 if (btrfs_super_nodesize(sb
) < 4096) {
1503 error("nodesize too small: %u < 4096",
1504 btrfs_super_nodesize(sb
));
1507 if (!IS_ALIGNED(btrfs_super_nodesize(sb
), 4096)) {
1508 error("nodesize unaligned: %u", btrfs_super_nodesize(sb
));
1511 if (btrfs_super_sectorsize(sb
) < 4096) {
1512 error("sectorsize too small: %u < 4096",
1513 btrfs_super_sectorsize(sb
));
1516 if (!IS_ALIGNED(btrfs_super_sectorsize(sb
), 4096)) {
1517 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb
));
1520 if (btrfs_super_total_bytes(sb
) == 0) {
1521 error("invalid total_bytes 0");
1524 if (btrfs_super_bytes_used(sb
) < 6 * btrfs_super_nodesize(sb
)) {
1525 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb
));
1528 if ((btrfs_super_stripesize(sb
) != 4096)
1529 && (btrfs_super_stripesize(sb
) != btrfs_super_sectorsize(sb
))) {
1530 error("invalid stripesize %u", btrfs_super_stripesize(sb
));
1534 if (memcmp(sb
->fsid
, sb
->dev_item
.fsid
, BTRFS_UUID_SIZE
) != 0) {
1535 char fsid
[BTRFS_UUID_UNPARSED_SIZE
];
1536 char dev_fsid
[BTRFS_UUID_UNPARSED_SIZE
];
1538 uuid_unparse(sb
->fsid
, fsid
);
1539 uuid_unparse(sb
->dev_item
.fsid
, dev_fsid
);
1540 error("dev_item UUID does not match fsid: %s != %s",
1546 * Hint to catch really bogus numbers, bitflips or so
1548 if (btrfs_super_num_devices(sb
) > (1UL << 31)) {
1549 warning("suspicious number of devices: %llu",
1550 btrfs_super_num_devices(sb
));
1553 if (btrfs_super_num_devices(sb
) == 0) {
1554 error("number of devices is 0");
1559 * Obvious sys_chunk_array corruptions, it must hold at least one key
1562 if (btrfs_super_sys_array_size(sb
) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
) {
1563 error("system chunk array too big %u > %u",
1564 btrfs_super_sys_array_size(sb
),
1565 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
);
1568 if (btrfs_super_sys_array_size(sb
) < sizeof(struct btrfs_disk_key
)
1569 + sizeof(struct btrfs_chunk
)) {
1570 error("system chunk array too small %u < %zu",
1571 btrfs_super_sys_array_size(sb
),
1572 sizeof(struct btrfs_disk_key
) +
1573 sizeof(struct btrfs_chunk
));
1580 error("superblock checksum matches but it has invalid members");
1584 int btrfs_read_dev_super(int fd
, struct btrfs_super_block
*sb
, u64 sb_bytenr
,
1587 u8 fsid
[BTRFS_FSID_SIZE
];
1588 int fsid_is_initialized
= 0;
1589 char tmp
[BTRFS_SUPER_INFO_SIZE
];
1590 struct btrfs_super_block
*buf
= (struct btrfs_super_block
*)tmp
;
1593 int max_super
= sbflags
& SBREAD_RECOVER
? BTRFS_SUPER_MIRROR_MAX
: 1;
1597 if (sb_bytenr
!= BTRFS_SUPER_INFO_OFFSET
) {
1598 ret
= pread64(fd
, buf
, BTRFS_SUPER_INFO_SIZE
, sb_bytenr
);
1603 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1604 if (ret
< BTRFS_SUPER_INFO_SIZE
)
1607 if (btrfs_super_bytenr(buf
) != sb_bytenr
)
1610 ret
= check_super(buf
, sbflags
);
1613 memcpy(sb
, buf
, BTRFS_SUPER_INFO_SIZE
);
1618 * we would like to check all the supers, but that would make
1619 * a btrfs mount succeed after a mkfs from a different FS.
1620 * So, we need to add a special mount option to scan for
1621 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1624 for (i
= 0; i
< max_super
; i
++) {
1625 bytenr
= btrfs_sb_offset(i
);
1626 ret
= pread64(fd
, buf
, BTRFS_SUPER_INFO_SIZE
, bytenr
);
1627 if (ret
< BTRFS_SUPER_INFO_SIZE
)
1630 if (btrfs_super_bytenr(buf
) != bytenr
)
1632 /* if magic is NULL, the device was removed */
1633 if (btrfs_super_magic(buf
) == 0 && i
== 0)
1635 if (check_super(buf
, sbflags
))
1638 if (!fsid_is_initialized
) {
1639 memcpy(fsid
, buf
->fsid
, sizeof(fsid
));
1640 fsid_is_initialized
= 1;
1641 } else if (memcmp(fsid
, buf
->fsid
, sizeof(fsid
))) {
1643 * the superblocks (the original one and
1644 * its backups) contain data of different
1645 * filesystems -> the super cannot be trusted
1650 if (btrfs_super_generation(buf
) > transid
) {
1651 memcpy(sb
, buf
, BTRFS_SUPER_INFO_SIZE
);
1652 transid
= btrfs_super_generation(buf
);
1656 return transid
> 0 ? 0 : -1;
1659 static int write_dev_supers(struct btrfs_root
*root
,
1660 struct btrfs_super_block
*sb
,
1661 struct btrfs_device
*device
)
1667 if (root
->fs_info
->super_bytenr
!= BTRFS_SUPER_INFO_OFFSET
) {
1668 btrfs_set_super_bytenr(sb
, root
->fs_info
->super_bytenr
);
1670 crc
= btrfs_csum_data((char *)sb
+ BTRFS_CSUM_SIZE
, crc
,
1671 BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
1672 btrfs_csum_final(crc
, &sb
->csum
[0]);
1675 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1676 * zero filled, we can use it directly
1678 ret
= pwrite64(device
->fd
, root
->fs_info
->super_copy
,
1679 BTRFS_SUPER_INFO_SIZE
,
1680 root
->fs_info
->super_bytenr
);
1681 if (ret
!= BTRFS_SUPER_INFO_SIZE
)
1686 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
1687 bytenr
= btrfs_sb_offset(i
);
1688 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
> device
->total_bytes
)
1691 btrfs_set_super_bytenr(sb
, bytenr
);
1694 crc
= btrfs_csum_data((char *)sb
+ BTRFS_CSUM_SIZE
, crc
,
1695 BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
1696 btrfs_csum_final(crc
, &sb
->csum
[0]);
1699 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1700 * zero filled, we can use it directly
1702 ret
= pwrite64(device
->fd
, root
->fs_info
->super_copy
,
1703 BTRFS_SUPER_INFO_SIZE
, bytenr
);
1704 if (ret
!= BTRFS_SUPER_INFO_SIZE
)
1712 fprintf(stderr
, "WARNING: failed to write all sb data\n");
1714 fprintf(stderr
, "WARNING: failed to write sb: %s\n",
1719 int write_all_supers(struct btrfs_root
*root
)
1721 struct list_head
*cur
;
1722 struct list_head
*head
= &root
->fs_info
->fs_devices
->devices
;
1723 struct btrfs_device
*dev
;
1724 struct btrfs_super_block
*sb
;
1725 struct btrfs_dev_item
*dev_item
;
1729 sb
= root
->fs_info
->super_copy
;
1730 dev_item
= &sb
->dev_item
;
1731 list_for_each(cur
, head
) {
1732 dev
= list_entry(cur
, struct btrfs_device
, dev_list
);
1733 if (!dev
->writeable
)
1736 btrfs_set_stack_device_generation(dev_item
, 0);
1737 btrfs_set_stack_device_type(dev_item
, dev
->type
);
1738 btrfs_set_stack_device_id(dev_item
, dev
->devid
);
1739 btrfs_set_stack_device_total_bytes(dev_item
, dev
->total_bytes
);
1740 btrfs_set_stack_device_bytes_used(dev_item
, dev
->bytes_used
);
1741 btrfs_set_stack_device_io_align(dev_item
, dev
->io_align
);
1742 btrfs_set_stack_device_io_width(dev_item
, dev
->io_width
);
1743 btrfs_set_stack_device_sector_size(dev_item
, dev
->sector_size
);
1744 memcpy(dev_item
->uuid
, dev
->uuid
, BTRFS_UUID_SIZE
);
1745 memcpy(dev_item
->fsid
, dev
->fs_devices
->fsid
, BTRFS_UUID_SIZE
);
1747 flags
= btrfs_super_flags(sb
);
1748 btrfs_set_super_flags(sb
, flags
| BTRFS_HEADER_FLAG_WRITTEN
);
1750 ret
= write_dev_supers(root
, sb
, dev
);
1756 int write_ctree_super(struct btrfs_trans_handle
*trans
,
1757 struct btrfs_root
*root
)
1760 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
1761 struct btrfs_root
*chunk_root
= root
->fs_info
->chunk_root
;
1763 if (root
->fs_info
->readonly
)
1766 btrfs_set_super_generation(root
->fs_info
->super_copy
,
1768 btrfs_set_super_root(root
->fs_info
->super_copy
,
1769 tree_root
->node
->start
);
1770 btrfs_set_super_root_level(root
->fs_info
->super_copy
,
1771 btrfs_header_level(tree_root
->node
));
1772 btrfs_set_super_chunk_root(root
->fs_info
->super_copy
,
1773 chunk_root
->node
->start
);
1774 btrfs_set_super_chunk_root_level(root
->fs_info
->super_copy
,
1775 btrfs_header_level(chunk_root
->node
));
1776 btrfs_set_super_chunk_root_generation(root
->fs_info
->super_copy
,
1777 btrfs_header_generation(chunk_root
->node
));
1779 ret
= write_all_supers(root
);
1781 fprintf(stderr
, "failed to write new super block err %d\n", ret
);
1785 int close_ctree_fs_info(struct btrfs_fs_info
*fs_info
)
1788 struct btrfs_trans_handle
*trans
;
1789 struct btrfs_root
*root
= fs_info
->tree_root
;
1791 if (fs_info
->last_trans_committed
!=
1792 fs_info
->generation
) {
1794 trans
= btrfs_start_transaction(root
, 1);
1795 btrfs_commit_transaction(trans
, root
);
1796 trans
= btrfs_start_transaction(root
, 1);
1797 ret
= commit_tree_roots(trans
, fs_info
);
1799 ret
= __commit_transaction(trans
, root
);
1801 write_ctree_super(trans
, root
);
1805 if (fs_info
->finalize_on_close
) {
1806 btrfs_set_super_magic(fs_info
->super_copy
, BTRFS_MAGIC
);
1807 root
->fs_info
->finalize_on_close
= 0;
1808 ret
= write_all_supers(root
);
1811 "failed to write new super block err %d\n", ret
);
1813 btrfs_free_block_groups(fs_info
);
1815 free_fs_roots_tree(&fs_info
->fs_root_tree
);
1817 btrfs_release_all_roots(fs_info
);
1818 btrfs_close_devices(fs_info
->fs_devices
);
1819 btrfs_cleanup_all_caches(fs_info
);
1820 btrfs_free_fs_info(fs_info
);
1824 int clean_tree_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1825 struct extent_buffer
*eb
)
1827 return clear_extent_buffer_dirty(eb
);
1830 void btrfs_mark_buffer_dirty(struct extent_buffer
*eb
)
1832 set_extent_buffer_dirty(eb
);
1835 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
)
1839 ret
= extent_buffer_uptodate(buf
);
1843 ret
= verify_parent_transid(buf
->tree
, buf
, parent_transid
, 1);
1847 int btrfs_set_buffer_uptodate(struct extent_buffer
*eb
)
1849 return set_extent_buffer_uptodate(eb
);