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.
19 #define _XOPEN_SOURCE 600
22 #include "kerncompat.h"
24 #include <sys/ioctl.h>
25 #include <sys/mount.h>
28 #include <sys/types.h>
33 #include <uuid/uuid.h>
38 #include "transaction.h"
41 #include <ext2fs/ext2_fs.h>
42 #include <ext2fs/ext2fs.h>
43 #include <ext2fs/ext2_ext_attr.h>
45 #define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
46 #define EXT2_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
49 * Open Ext2fs in readonly mode, read block allocation bitmap and
50 * inode bitmap into memory.
52 static int open_ext2fs(const char *name
, ext2_filsys
*ret_fs
)
57 ret
= ext2fs_open(name
, 0, 0, 0, unix_io_manager
, &ext2_fs
);
59 fprintf(stderr
, "ext2fs_open: %s\n", error_message(ret
));
62 ret
= ext2fs_read_inode_bitmap(ext2_fs
);
64 fprintf(stderr
, "ext2fs_read_inode_bitmap: %s\n",
68 ret
= ext2fs_read_block_bitmap(ext2_fs
);
70 fprintf(stderr
, "ext2fs_read_block_bitmap: %s\n",
75 * search each block group for a free inode. this set up
76 * uninit block/inode bitmaps appropriately.
79 while (ino
<= ext2_fs
->super
->s_inodes_count
) {
81 ext2fs_new_inode(ext2_fs
, ino
, 0, NULL
, &foo
);
82 ino
+= EXT2_INODES_PER_GROUP(ext2_fs
->super
);
91 static int close_ext2fs(ext2_filsys fs
)
97 static int ext2_alloc_block(ext2_filsys fs
, u64 goal
, u64
*block_ret
)
101 if (!ext2fs_new_block(fs
, goal
, NULL
, &block
)) {
102 ext2fs_fast_mark_block_bitmap(fs
->block_map
, block
);
109 static int ext2_free_block(ext2_filsys fs
, u64 block
)
111 BUG_ON(block
!= (blk_t
)block
);
112 ext2fs_fast_unmark_block_bitmap(fs
->block_map
, block
);
116 static int cache_free_extents(struct btrfs_root
*root
, ext2_filsys ext2_fs
)
122 u64 blocksize
= ext2_fs
->blocksize
;
124 block
= ext2_fs
->super
->s_first_data_block
;
125 for (; block
< ext2_fs
->super
->s_blocks_count
; block
++) {
126 if (ext2fs_fast_test_block_bitmap(ext2_fs
->block_map
, block
))
128 bytenr
= block
* blocksize
;
129 ret
= set_extent_dirty(&root
->fs_info
->free_space_cache
,
130 bytenr
, bytenr
+ blocksize
- 1, 0);
134 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
135 bytenr
= btrfs_sb_offset(i
);
136 bytenr
&= ~((u64
)BTRFS_STRIPE_LEN
- 1);
137 if (bytenr
>= blocksize
* ext2_fs
->super
->s_blocks_count
)
139 clear_extent_dirty(&root
->fs_info
->free_space_cache
, bytenr
,
140 bytenr
+ BTRFS_STRIPE_LEN
- 1, 0);
143 clear_extent_dirty(&root
->fs_info
->free_space_cache
,
144 0, BTRFS_SUPER_INFO_OFFSET
- 1, 0);
149 static int custom_alloc_extent(struct btrfs_root
*root
, u64 num_bytes
,
150 u64 hint_byte
, struct btrfs_key
*ins
)
154 u64 last
= hint_byte
;
157 struct btrfs_block_group_cache
*cache
;
160 ret
= find_first_extent_bit(&root
->fs_info
->free_space_cache
,
161 last
, &start
, &end
, EXTENT_DIRTY
);
163 if (wrapped
++ == 0) {
171 start
= max(last
, start
);
173 if (last
- start
< num_bytes
)
176 last
= start
+ num_bytes
;
177 if (test_range_bit(&root
->fs_info
->pinned_extents
,
178 start
, last
- 1, EXTENT_DIRTY
, 0))
181 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
183 if (cache
->flags
& BTRFS_BLOCK_GROUP_SYSTEM
||
184 last
> cache
->key
.objectid
+ cache
->key
.offset
) {
185 last
= cache
->key
.objectid
+ cache
->key
.offset
;
189 clear_extent_dirty(&root
->fs_info
->free_space_cache
,
190 start
, start
+ num_bytes
- 1, 0);
192 ins
->objectid
= start
;
193 ins
->offset
= num_bytes
;
194 ins
->type
= BTRFS_EXTENT_ITEM_KEY
;
198 fprintf(stderr
, "not enough free space\n");
202 static int intersect_with_sb(u64 bytenr
, u64 num_bytes
)
207 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
208 offset
= btrfs_sb_offset(i
);
209 offset
&= ~((u64
)BTRFS_STRIPE_LEN
- 1);
211 if (bytenr
< offset
+ BTRFS_STRIPE_LEN
&&
212 bytenr
+ num_bytes
> offset
)
218 static int custom_free_extent(struct btrfs_root
*root
, u64 bytenr
,
221 return intersect_with_sb(bytenr
, num_bytes
);
224 static struct btrfs_extent_ops extent_ops
= {
225 .alloc_extent
= custom_alloc_extent
,
226 .free_extent
= custom_free_extent
,
229 struct dir_iterate_data
{
230 struct btrfs_trans_handle
*trans
;
231 struct btrfs_root
*root
;
232 struct btrfs_inode_item
*inode
;
239 static u8 filetype_conversion_table
[EXT2_FT_MAX
] = {
240 [EXT2_FT_UNKNOWN
] = BTRFS_FT_UNKNOWN
,
241 [EXT2_FT_REG_FILE
] = BTRFS_FT_REG_FILE
,
242 [EXT2_FT_DIR
] = BTRFS_FT_DIR
,
243 [EXT2_FT_CHRDEV
] = BTRFS_FT_CHRDEV
,
244 [EXT2_FT_BLKDEV
] = BTRFS_FT_BLKDEV
,
245 [EXT2_FT_FIFO
] = BTRFS_FT_FIFO
,
246 [EXT2_FT_SOCK
] = BTRFS_FT_SOCK
,
247 [EXT2_FT_SYMLINK
] = BTRFS_FT_SYMLINK
,
250 static int dir_iterate_proc(ext2_ino_t dir
, int entry
,
251 struct ext2_dir_entry
*dirent
,
252 int offset
, int blocksize
,
253 char *buf
,void *priv_data
)
259 char dotdot
[] = "..";
260 struct btrfs_key location
;
261 struct dir_iterate_data
*idata
= (struct dir_iterate_data
*)priv_data
;
264 name_len
= dirent
->name_len
& 0xFF;
266 objectid
= dirent
->inode
+ INO_OFFSET
;
267 if (!strncmp(dirent
->name
, dotdot
, name_len
)) {
269 BUG_ON(idata
->parent
!= 0);
270 idata
->parent
= objectid
;
274 if (dirent
->inode
< EXT2_GOOD_OLD_FIRST_INO
)
277 location
.objectid
= objectid
;
279 btrfs_set_key_type(&location
, BTRFS_INODE_ITEM_KEY
);
281 file_type
= dirent
->name_len
>> 8;
282 BUG_ON(file_type
> EXT2_FT_SYMLINK
);
283 ret
= btrfs_insert_dir_item(idata
->trans
, idata
->root
,
284 dirent
->name
, name_len
,
285 idata
->objectid
, &location
,
286 filetype_conversion_table
[file_type
],
290 ret
= btrfs_insert_inode_ref(idata
->trans
, idata
->root
,
291 dirent
->name
, name_len
,
292 objectid
, idata
->objectid
,
297 inode_size
= btrfs_stack_inode_size(idata
->inode
) +
299 btrfs_set_stack_inode_size(idata
->inode
, inode_size
);
302 idata
->errcode
= ret
;
306 static int create_dir_entries(struct btrfs_trans_handle
*trans
,
307 struct btrfs_root
*root
, u64 objectid
,
308 struct btrfs_inode_item
*btrfs_inode
,
309 ext2_filsys ext2_fs
, ext2_ino_t ext2_ino
)
313 struct dir_iterate_data data
= {
316 .inode
= btrfs_inode
,
317 .objectid
= objectid
,
323 err
= ext2fs_dir_iterate2(ext2_fs
, ext2_ino
, 0, NULL
,
324 dir_iterate_proc
, &data
);
328 if (ret
== 0 && data
.parent
== objectid
) {
329 ret
= btrfs_insert_inode_ref(trans
, root
, "..", 2,
330 objectid
, objectid
, 0);
334 fprintf(stderr
, "ext2fs_dir_iterate2: %s\n", error_message(err
));
338 static int read_disk_extent(struct btrfs_root
*root
, u64 bytenr
,
339 u32 num_bytes
, char *buffer
)
342 struct btrfs_fs_devices
*fs_devs
= root
->fs_info
->fs_devices
;
344 ret
= pread(fs_devs
->latest_bdev
, buffer
, num_bytes
, bytenr
);
345 if (ret
!= num_bytes
)
354 static int csum_disk_extent(struct btrfs_trans_handle
*trans
,
355 struct btrfs_root
*root
,
356 u64 disk_bytenr
, u64 num_bytes
)
358 u32 blocksize
= root
->sectorsize
;
363 buffer
= malloc(blocksize
);
366 for (offset
= 0; offset
< num_bytes
; offset
+= blocksize
) {
367 ret
= read_disk_extent(root
, disk_bytenr
+ offset
,
371 ret
= btrfs_csum_file_block(trans
,
372 root
->fs_info
->csum_root
,
373 disk_bytenr
+ num_bytes
,
374 disk_bytenr
+ offset
,
383 static int record_file_blocks(struct btrfs_trans_handle
*trans
,
384 struct btrfs_root
*root
, u64 objectid
,
385 struct btrfs_inode_item
*inode
,
386 u64 file_block
, u64 disk_block
,
387 u64 num_blocks
, int checksum
)
390 u64 file_pos
= file_block
* root
->sectorsize
;
391 u64 disk_bytenr
= disk_block
* root
->sectorsize
;
392 u64 num_bytes
= num_blocks
* root
->sectorsize
;
393 ret
= btrfs_record_file_extent(trans
, root
, objectid
, inode
, file_pos
,
394 disk_bytenr
, num_bytes
);
396 if (ret
|| !checksum
)
399 return csum_disk_extent(trans
, root
, disk_bytenr
, num_bytes
);
402 struct blk_iterate_data
{
403 struct btrfs_trans_handle
*trans
;
404 struct btrfs_root
*root
;
405 struct btrfs_inode_item
*inode
;
415 static int block_iterate_proc(ext2_filsys ext2_fs
,
416 u64 disk_block
, u64 file_block
,
417 struct blk_iterate_data
*idata
)
422 struct btrfs_root
*root
= idata
->root
;
423 struct btrfs_trans_handle
*trans
= idata
->trans
;
424 struct btrfs_block_group_cache
*cache
;
425 u64 bytenr
= disk_block
* root
->sectorsize
;
427 sb_region
= intersect_with_sb(bytenr
, root
->sectorsize
);
428 do_barrier
= sb_region
|| disk_block
>= idata
->boundary
;
429 if ((idata
->num_blocks
> 0 && do_barrier
) ||
430 (file_block
> idata
->first_block
+ idata
->num_blocks
) ||
431 (disk_block
!= idata
->disk_block
+ idata
->num_blocks
)) {
432 if (idata
->num_blocks
> 0) {
433 ret
= record_file_blocks(trans
, root
, idata
->objectid
,
434 idata
->inode
, idata
->first_block
,
435 idata
->disk_block
, idata
->num_blocks
,
439 idata
->first_block
+= idata
->num_blocks
;
440 idata
->num_blocks
= 0;
442 if (file_block
> idata
->first_block
) {
443 ret
= record_file_blocks(trans
, root
, idata
->objectid
,
444 idata
->inode
, idata
->first_block
,
445 0, file_block
- idata
->first_block
,
452 bytenr
+= BTRFS_STRIPE_LEN
- 1;
453 bytenr
&= ~((u64
)BTRFS_STRIPE_LEN
- 1);
455 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
457 bytenr
= cache
->key
.objectid
+ cache
->key
.offset
;
460 idata
->first_block
= file_block
;
461 idata
->disk_block
= disk_block
;
462 idata
->boundary
= bytenr
/ root
->sectorsize
;
467 idata
->errcode
= ret
;
471 static int __block_iterate_proc(ext2_filsys fs
, blk_t
*blocknr
,
472 e2_blkcnt_t blockcnt
, blk_t ref_block
,
473 int ref_offset
, void *priv_data
)
475 struct blk_iterate_data
*idata
;
476 idata
= (struct blk_iterate_data
*)priv_data
;
477 return block_iterate_proc(fs
, *blocknr
, blockcnt
, idata
);
481 * traverse file's data blocks, record these data blocks as file extents.
483 static int create_file_extents(struct btrfs_trans_handle
*trans
,
484 struct btrfs_root
*root
, u64 objectid
,
485 struct btrfs_inode_item
*btrfs_inode
,
486 ext2_filsys ext2_fs
, ext2_ino_t ext2_ino
,
487 int datacsum
, int packing
)
493 u32 sectorsize
= root
->sectorsize
;
494 u64 inode_size
= btrfs_stack_inode_size(btrfs_inode
);
495 struct blk_iterate_data data
= {
498 .inode
= btrfs_inode
,
499 .objectid
= objectid
,
504 .checksum
= datacsum
,
507 err
= ext2fs_block_iterate2(ext2_fs
, ext2_ino
, BLOCK_FLAG_DATA_ONLY
,
508 NULL
, __block_iterate_proc
, &data
);
514 if (packing
&& data
.first_block
== 0 && data
.num_blocks
> 0 &&
515 inode_size
<= BTRFS_MAX_INLINE_DATA_SIZE(root
)) {
516 u64 num_bytes
= data
.num_blocks
* sectorsize
;
517 u64 disk_bytenr
= data
.disk_block
* sectorsize
;
520 buffer
= malloc(num_bytes
);
523 ret
= read_disk_extent(root
, disk_bytenr
, num_bytes
, buffer
);
526 if (num_bytes
> inode_size
)
527 num_bytes
= inode_size
;
528 ret
= btrfs_insert_inline_extent(trans
, root
, objectid
,
529 0, buffer
, num_bytes
);
532 nbytes
= btrfs_stack_inode_nbytes(btrfs_inode
) + num_bytes
;
533 btrfs_set_stack_inode_nbytes(btrfs_inode
, nbytes
);
534 } else if (data
.num_blocks
> 0) {
535 ret
= record_file_blocks(trans
, root
, objectid
, btrfs_inode
,
536 data
.first_block
, data
.disk_block
,
537 data
.num_blocks
, data
.checksum
);
541 data
.first_block
+= data
.num_blocks
;
542 last_block
= (inode_size
+ sectorsize
- 1) / sectorsize
;
543 if (last_block
> data
.first_block
) {
544 ret
= record_file_blocks(trans
, root
, objectid
, btrfs_inode
,
545 data
.first_block
, 0, last_block
-
546 data
.first_block
, data
.checksum
);
552 fprintf(stderr
, "ext2fs_block_iterate2: %s\n", error_message(err
));
556 static int create_symbol_link(struct btrfs_trans_handle
*trans
,
557 struct btrfs_root
*root
, u64 objectid
,
558 struct btrfs_inode_item
*btrfs_inode
,
559 ext2_filsys ext2_fs
, ext2_ino_t ext2_ino
,
560 struct ext2_inode
*ext2_inode
)
564 u64 inode_size
= btrfs_stack_inode_size(btrfs_inode
);
565 if (ext2fs_inode_data_blocks(ext2_fs
, ext2_inode
)) {
566 btrfs_set_stack_inode_size(btrfs_inode
, inode_size
+ 1);
567 ret
= create_file_extents(trans
, root
, objectid
, btrfs_inode
,
568 ext2_fs
, ext2_ino
, 1, 1);
569 btrfs_set_stack_inode_size(btrfs_inode
, inode_size
);
573 pathname
= (char *)&(ext2_inode
->i_block
[0]);
574 BUG_ON(pathname
[inode_size
] != 0);
575 ret
= btrfs_insert_inline_extent(trans
, root
, objectid
, 0,
576 pathname
, inode_size
+ 1);
577 btrfs_set_stack_inode_nbytes(btrfs_inode
, inode_size
+ 1);
582 * Following xattr/acl related codes are based on codes in
583 * fs/ext3/xattr.c and fs/ext3/acl.c
585 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
586 #define EXT2_XATTR_BFIRST(ptr) \
587 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
588 #define EXT2_XATTR_IHDR(inode) \
589 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
590 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
591 #define EXT2_XATTR_IFIRST(inode) \
592 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
593 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
595 static int ext2_xattr_check_names(struct ext2_ext_attr_entry
*entry
,
598 struct ext2_ext_attr_entry
*next
;
600 while (!EXT2_EXT_IS_LAST_ENTRY(entry
)) {
601 next
= EXT2_EXT_ATTR_NEXT(entry
);
602 if ((void *)next
>= end
)
609 static int ext2_xattr_check_block(const char *buf
, size_t size
)
612 struct ext2_ext_attr_header
*header
= EXT2_XATTR_BHDR(buf
);
614 if (header
->h_magic
!= EXT2_EXT_ATTR_MAGIC
||
615 header
->h_blocks
!= 1)
617 error
= ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf
), buf
+ size
);
621 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry
*entry
,
624 size_t value_size
= entry
->e_value_size
;
626 if (entry
->e_value_block
!= 0 || value_size
> size
||
627 entry
->e_value_offs
+ value_size
> size
)
632 #define EXT2_ACL_VERSION 0x0001
643 } ext2_acl_entry_short
;
649 static inline int ext2_acl_count(size_t size
)
652 size
-= sizeof(ext2_acl_header
);
653 s
= size
- 4 * sizeof(ext2_acl_entry_short
);
655 if (size
% sizeof(ext2_acl_entry_short
))
657 return size
/ sizeof(ext2_acl_entry_short
);
659 if (s
% sizeof(ext2_acl_entry
))
661 return s
/ sizeof(ext2_acl_entry
) + 4;
665 #define ACL_EA_VERSION 0x0002
675 acl_ea_entry a_entries
[0];
678 static inline size_t acl_ea_size(int count
)
680 return sizeof(acl_ea_header
) + count
* sizeof(acl_ea_entry
);
683 static int ext2_acl_to_xattr(void *dst
, const void *src
,
684 size_t dst_size
, size_t src_size
)
687 const void *end
= src
+ src_size
;
688 acl_ea_header
*ext_acl
= (acl_ea_header
*)dst
;
689 acl_ea_entry
*dst_entry
= ext_acl
->a_entries
;
690 ext2_acl_entry
*src_entry
;
692 if (src_size
< sizeof(ext2_acl_header
))
694 if (((ext2_acl_header
*)src
)->a_version
!=
695 cpu_to_le32(EXT2_ACL_VERSION
))
697 src
+= sizeof(ext2_acl_header
);
698 count
= ext2_acl_count(src_size
);
702 BUG_ON(dst_size
< acl_ea_size(count
));
703 ext_acl
->a_version
= cpu_to_le32(ACL_EA_VERSION
);
704 for (i
= 0; i
< count
; i
++, dst_entry
++) {
705 src_entry
= (ext2_acl_entry
*)src
;
706 if (src
+ sizeof(ext2_acl_entry_short
) > end
)
708 dst_entry
->e_tag
= src_entry
->e_tag
;
709 dst_entry
->e_perm
= src_entry
->e_perm
;
710 switch (le16_to_cpu(src_entry
->e_tag
)) {
715 src
+= sizeof(ext2_acl_entry_short
);
716 dst_entry
->e_id
= cpu_to_le32(ACL_UNDEFINED_ID
);
720 src
+= sizeof(ext2_acl_entry
);
723 dst_entry
->e_id
= src_entry
->e_id
;
736 static char *xattr_prefix_table
[] = {
738 [2] = "system.posix_acl_access",
739 [3] = "system.posix_acl_default",
744 static int copy_single_xattr(struct btrfs_trans_handle
*trans
,
745 struct btrfs_root
*root
, u64 objectid
,
746 struct ext2_ext_attr_entry
*entry
,
747 const void *data
, u32 datalen
)
752 void *databuf
= NULL
;
753 char namebuf
[XATTR_NAME_MAX
+ 1];
755 name_index
= entry
->e_name_index
;
756 if (name_index
>= ARRAY_SIZE(xattr_prefix_table
) ||
757 xattr_prefix_table
[name_index
] == NULL
)
759 name_len
= strlen(xattr_prefix_table
[name_index
]) +
761 if (name_len
>= sizeof(namebuf
))
764 if (name_index
== 2 || name_index
== 3) {
765 size_t bufsize
= acl_ea_size(ext2_acl_count(datalen
));
766 databuf
= malloc(bufsize
);
769 ret
= ext2_acl_to_xattr(databuf
, data
, bufsize
, datalen
);
775 strncpy(namebuf
, xattr_prefix_table
[name_index
], XATTR_NAME_MAX
);
776 strncat(namebuf
, EXT2_EXT_ATTR_NAME(entry
), entry
->e_name_len
);
777 if (name_len
+ datalen
> BTRFS_LEAF_DATA_SIZE(root
) -
778 sizeof(struct btrfs_item
) - sizeof(struct btrfs_dir_item
)) {
779 fprintf(stderr
, "skip large xattr on inode %Lu name %.*s\n",
780 objectid
- INO_OFFSET
, name_len
, namebuf
);
783 ret
= btrfs_insert_xattr_item(trans
, root
, namebuf
, name_len
,
784 data
, datalen
, objectid
);
790 static int copy_extended_attrs(struct btrfs_trans_handle
*trans
,
791 struct btrfs_root
*root
, u64 objectid
,
792 struct btrfs_inode_item
*btrfs_inode
,
793 ext2_filsys ext2_fs
, ext2_ino_t ext2_ino
)
799 u32 block_size
= ext2_fs
->blocksize
;
800 u32 inode_size
= EXT2_INODE_SIZE(ext2_fs
->super
);
801 struct ext2_inode_large
*ext2_inode
;
802 struct ext2_ext_attr_entry
*entry
;
805 char inode_buf
[EXT2_GOOD_OLD_INODE_SIZE
];
807 if (inode_size
<= EXT2_GOOD_OLD_INODE_SIZE
) {
808 ext2_inode
= (struct ext2_inode_large
*)inode_buf
;
810 ext2_inode
= (struct ext2_inode_large
*)malloc(inode_size
);
814 err
= ext2fs_read_inode_full(ext2_fs
, ext2_ino
, (void *)ext2_inode
,
817 fprintf(stderr
, "ext2fs_read_inode_full: %s\n",
823 if (ext2_ino
> ext2_fs
->super
->s_first_ino
&&
824 inode_size
> EXT2_GOOD_OLD_INODE_SIZE
) {
825 if (EXT2_GOOD_OLD_INODE_SIZE
+
826 ext2_inode
->i_extra_isize
> inode_size
) {
830 if (ext2_inode
->i_extra_isize
!= 0 &&
831 EXT2_XATTR_IHDR(ext2_inode
)->h_magic
==
832 EXT2_EXT_ATTR_MAGIC
) {
838 void *end
= (void *)ext2_inode
+ inode_size
;
839 entry
= EXT2_XATTR_IFIRST(ext2_inode
);
840 total
= end
- (void *)entry
;
841 ret
= ext2_xattr_check_names(entry
, end
);
844 while (!EXT2_EXT_IS_LAST_ENTRY(entry
)) {
845 ret
= ext2_xattr_check_entry(entry
, total
);
848 data
= (void *)EXT2_XATTR_IFIRST(ext2_inode
) +
850 datalen
= entry
->e_value_size
;
851 ret
= copy_single_xattr(trans
, root
, objectid
,
852 entry
, data
, datalen
);
855 entry
= EXT2_EXT_ATTR_NEXT(entry
);
859 if (ext2_inode
->i_file_acl
== 0)
862 buffer
= malloc(block_size
);
867 err
= ext2fs_read_ext_attr(ext2_fs
, ext2_inode
->i_file_acl
, buffer
);
869 fprintf(stderr
, "ext2fs_read_ext_attr: %s\n",
874 ret
= ext2_xattr_check_block(buffer
, block_size
);
878 entry
= EXT2_XATTR_BFIRST(buffer
);
879 while (!EXT2_EXT_IS_LAST_ENTRY(entry
)) {
880 ret
= ext2_xattr_check_entry(entry
, block_size
);
883 data
= buffer
+ entry
->e_value_offs
;
884 datalen
= entry
->e_value_size
;
885 ret
= copy_single_xattr(trans
, root
, objectid
,
886 entry
, data
, datalen
);
889 entry
= EXT2_EXT_ATTR_NEXT(entry
);
893 if ((void *)ext2_inode
!= inode_buf
)
898 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
900 static inline dev_t
old_decode_dev(u16 val
)
902 return MKDEV((val
>> 8) & 255, val
& 255);
905 static inline dev_t
new_decode_dev(u32 dev
)
907 unsigned major
= (dev
& 0xfff00) >> 8;
908 unsigned minor
= (dev
& 0xff) | ((dev
>> 12) & 0xfff00);
909 return MKDEV(major
, minor
);
912 static int copy_inode_item(struct btrfs_inode_item
*dst
,
913 struct ext2_inode
*src
, u32 blocksize
)
915 btrfs_set_stack_inode_generation(dst
, 1);
916 btrfs_set_stack_inode_size(dst
, src
->i_size
);
917 btrfs_set_stack_inode_nbytes(dst
, 0);
918 btrfs_set_stack_inode_block_group(dst
, 0);
919 btrfs_set_stack_inode_nlink(dst
, src
->i_links_count
);
920 btrfs_set_stack_inode_uid(dst
, src
->i_uid
| (src
->i_uid_high
<< 16));
921 btrfs_set_stack_inode_gid(dst
, src
->i_gid
| (src
->i_gid_high
<< 16));
922 btrfs_set_stack_inode_mode(dst
, src
->i_mode
);
923 btrfs_set_stack_inode_rdev(dst
, 0);
924 btrfs_set_stack_inode_flags(dst
, 0);
925 btrfs_set_stack_timespec_sec(&dst
->atime
, src
->i_atime
);
926 btrfs_set_stack_timespec_nsec(&dst
->atime
, 0);
927 btrfs_set_stack_timespec_sec(&dst
->ctime
, src
->i_ctime
);
928 btrfs_set_stack_timespec_nsec(&dst
->ctime
, 0);
929 btrfs_set_stack_timespec_sec(&dst
->mtime
, src
->i_mtime
);
930 btrfs_set_stack_timespec_nsec(&dst
->mtime
, 0);
931 btrfs_set_stack_timespec_sec(&dst
->otime
, 0);
932 btrfs_set_stack_timespec_nsec(&dst
->otime
, 0);
934 if (S_ISDIR(src
->i_mode
)) {
935 btrfs_set_stack_inode_size(dst
, 0);
936 btrfs_set_stack_inode_nlink(dst
, 1);
938 if (S_ISREG(src
->i_mode
)) {
939 btrfs_set_stack_inode_size(dst
, (u64
)src
->i_size_high
<< 32 |
942 if (!S_ISREG(src
->i_mode
) && !S_ISDIR(src
->i_mode
) &&
943 !S_ISLNK(src
->i_mode
)) {
944 if (src
->i_block
[0]) {
945 btrfs_set_stack_inode_rdev(dst
,
946 old_decode_dev(src
->i_block
[0]));
948 btrfs_set_stack_inode_rdev(dst
,
949 new_decode_dev(src
->i_block
[1]));
956 * copy a single inode. do all the required works, such as cloning
957 * inode item, creating file extents and creating directory entries.
959 static int copy_single_inode(struct btrfs_trans_handle
*trans
,
960 struct btrfs_root
*root
, u64 objectid
,
961 ext2_filsys ext2_fs
, ext2_ino_t ext2_ino
,
962 struct ext2_inode
*ext2_inode
,
963 int datacsum
, int packing
, int noxattr
)
966 struct btrfs_key inode_key
;
967 struct btrfs_inode_item btrfs_inode
;
969 if (ext2_inode
->i_links_count
== 0)
972 copy_inode_item(&btrfs_inode
, ext2_inode
, ext2_fs
->blocksize
);
973 if (!datacsum
&& S_ISREG(ext2_inode
->i_mode
)) {
974 u32 flags
= btrfs_stack_inode_flags(&btrfs_inode
) |
975 BTRFS_INODE_NODATASUM
;
976 btrfs_set_stack_inode_flags(&btrfs_inode
, flags
);
979 switch (ext2_inode
->i_mode
& S_IFMT
) {
981 ret
= create_file_extents(trans
, root
, objectid
, &btrfs_inode
,
982 ext2_fs
, ext2_ino
, datacsum
, packing
);
985 ret
= create_dir_entries(trans
, root
, objectid
, &btrfs_inode
,
989 ret
= create_symbol_link(trans
, root
, objectid
, &btrfs_inode
,
990 ext2_fs
, ext2_ino
, ext2_inode
);
1000 ret
= copy_extended_attrs(trans
, root
, objectid
, &btrfs_inode
,
1005 inode_key
.objectid
= objectid
;
1006 inode_key
.offset
= 0;
1007 btrfs_set_key_type(&inode_key
, BTRFS_INODE_ITEM_KEY
);
1008 ret
= btrfs_insert_inode(trans
, root
, objectid
, &btrfs_inode
);
1012 static int copy_disk_extent(struct btrfs_root
*root
, u64 dst_bytenr
,
1013 u64 src_bytenr
, u32 num_bytes
)
1017 struct btrfs_fs_devices
*fs_devs
= root
->fs_info
->fs_devices
;
1019 buffer
= malloc(num_bytes
);
1022 ret
= pread(fs_devs
->latest_bdev
, buffer
, num_bytes
, src_bytenr
);
1023 if (ret
!= num_bytes
)
1025 ret
= pwrite(fs_devs
->latest_bdev
, buffer
, num_bytes
, dst_bytenr
);
1026 if (ret
!= num_bytes
)
1036 * scan ext2's inode bitmap and copy all used inodes.
1038 static int copy_inodes(struct btrfs_root
*root
, ext2_filsys ext2_fs
,
1039 int datacsum
, int packing
, int noxattr
)
1043 ext2_inode_scan ext2_scan
;
1044 struct ext2_inode ext2_inode
;
1045 ext2_ino_t ext2_ino
;
1047 struct btrfs_trans_handle
*trans
;
1049 trans
= btrfs_start_transaction(root
, 1);
1052 err
= ext2fs_open_inode_scan(ext2_fs
, 0, &ext2_scan
);
1054 fprintf(stderr
, "ext2fs_open_inode_scan: %s\n", error_message(err
));
1057 while (!(err
= ext2fs_get_next_inode(ext2_scan
, &ext2_ino
,
1059 /* no more inodes */
1062 /* skip special inode in ext2fs */
1063 if (ext2_ino
< EXT2_GOOD_OLD_FIRST_INO
&&
1064 ext2_ino
!= EXT2_ROOT_INO
)
1066 objectid
= ext2_ino
+ INO_OFFSET
;
1067 ret
= copy_single_inode(trans
, root
,
1068 objectid
, ext2_fs
, ext2_ino
,
1069 &ext2_inode
, datacsum
, packing
,
1073 if (trans
->blocks_used
>= 4096) {
1074 ret
= btrfs_commit_transaction(trans
, root
);
1076 trans
= btrfs_start_transaction(root
, 1);
1081 fprintf(stderr
, "ext2fs_get_next_inode: %s\n", error_message(err
));
1084 ret
= btrfs_commit_transaction(trans
, root
);
1091 * Construct a range of ext2fs image file.
1092 * scan block allocation bitmap, find all blocks used by the ext2fs
1093 * in this range and create file extents that point to these blocks.
1095 * Note: Before calling the function, no file extent points to blocks
1098 static int create_image_file_range(struct btrfs_trans_handle
*trans
,
1099 struct btrfs_root
*root
, u64 objectid
,
1100 struct btrfs_inode_item
*inode
,
1101 u64 start_byte
, u64 end_byte
,
1102 ext2_filsys ext2_fs
)
1104 u32 blocksize
= ext2_fs
->blocksize
;
1105 u32 block
= start_byte
/ blocksize
;
1106 u32 last_block
= (end_byte
+ blocksize
- 1) / blocksize
;
1108 struct blk_iterate_data data
= {
1112 .objectid
= objectid
,
1113 .first_block
= block
,
1116 .boundary
= (u64
)-1,
1120 for (; start_byte
< end_byte
; block
++, start_byte
+= blocksize
) {
1121 if (!ext2fs_fast_test_block_bitmap(ext2_fs
->block_map
, block
))
1123 ret
= block_iterate_proc(NULL
, block
, block
, &data
);
1124 if (ret
& BLOCK_ABORT
) {
1129 if (data
.num_blocks
> 0) {
1130 ret
= record_file_blocks(trans
, root
, objectid
, inode
,
1131 data
.first_block
, data
.disk_block
,
1132 data
.num_blocks
, 0);
1135 data
.first_block
+= data
.num_blocks
;
1137 if (last_block
> data
.first_block
) {
1138 ret
= record_file_blocks(trans
, root
, objectid
, inode
,
1139 data
.first_block
, 0, last_block
-
1140 data
.first_block
, 0);
1148 * Create the ext2fs image file.
1150 static int create_ext2_image(struct btrfs_root
*root
, ext2_filsys ext2_fs
,
1154 struct btrfs_key key
;
1155 struct btrfs_key location
;
1156 struct btrfs_path path
;
1157 struct btrfs_inode_item btrfs_inode
;
1158 struct btrfs_inode_item
*inode_item
;
1159 struct extent_buffer
*leaf
;
1160 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1161 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
1162 struct btrfs_trans_handle
*trans
;
1163 struct btrfs_extent_item
*ei
;
1164 struct btrfs_extent_inline_ref
*iref
;
1165 struct btrfs_extent_data_ref
*dref
;
1172 u32 sectorsize
= root
->sectorsize
;
1174 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
1175 first_free
= BTRFS_SUPER_INFO_OFFSET
+ sectorsize
* 2 - 1;
1176 first_free
&= ~((u64
)sectorsize
- 1);
1178 memset(&btrfs_inode
, 0, sizeof(btrfs_inode
));
1179 btrfs_set_stack_inode_generation(&btrfs_inode
, 1);
1180 btrfs_set_stack_inode_size(&btrfs_inode
, total_bytes
);
1181 btrfs_set_stack_inode_nlink(&btrfs_inode
, 1);
1182 btrfs_set_stack_inode_nbytes(&btrfs_inode
, 0);
1183 btrfs_set_stack_inode_mode(&btrfs_inode
, S_IFREG
| 0400);
1184 btrfs_set_stack_inode_flags(&btrfs_inode
, BTRFS_INODE_NODATASUM
|
1185 BTRFS_INODE_READONLY
);
1186 btrfs_init_path(&path
);
1187 trans
= btrfs_start_transaction(root
, 1);
1190 objectid
= btrfs_root_dirid(&root
->root_item
);
1191 ret
= btrfs_find_free_objectid(trans
, root
, objectid
, &objectid
);
1196 * copy blocks covered by extent #0 to new positions. extent #0 is
1197 * special, we can't rely on relocate_extents_range to relocate it.
1199 for (last_byte
= 0; last_byte
< first_free
; last_byte
+= sectorsize
) {
1200 ret
= custom_alloc_extent(root
, sectorsize
, 0, &key
);
1203 ret
= copy_disk_extent(root
, key
.objectid
, last_byte
,
1207 ret
= btrfs_record_file_extent(trans
, root
, objectid
,
1208 &btrfs_inode
, last_byte
,
1209 key
.objectid
, sectorsize
);
1215 key
.objectid
= last_byte
;
1217 btrfs_set_key_type(&key
, BTRFS_EXTENT_ITEM_KEY
);
1218 ret
= btrfs_search_slot(trans
, fs_info
->extent_root
,
1223 leaf
= path
.nodes
[0];
1224 if (path
.slots
[0] >= btrfs_header_nritems(leaf
)) {
1225 ret
= btrfs_next_leaf(extent_root
, &path
);
1230 leaf
= path
.nodes
[0];
1232 btrfs_item_key_to_cpu(leaf
, &key
, path
.slots
[0]);
1233 if (last_byte
> key
.objectid
||
1234 key
.type
!= BTRFS_EXTENT_ITEM_KEY
) {
1239 bytenr
= key
.objectid
;
1240 num_bytes
= key
.offset
;
1241 ei
= btrfs_item_ptr(leaf
, path
.slots
[0],
1242 struct btrfs_extent_item
);
1243 if (!(btrfs_extent_flags(leaf
, ei
) & BTRFS_EXTENT_FLAG_DATA
)) {
1248 BUG_ON(btrfs_item_size_nr(leaf
, path
.slots
[0]) != sizeof(*ei
) +
1249 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY
));
1251 iref
= (struct btrfs_extent_inline_ref
*)(ei
+ 1);
1252 key
.type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1253 BUG_ON(key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
);
1254 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1255 if (btrfs_extent_data_ref_root(leaf
, dref
) !=
1256 BTRFS_FS_TREE_OBJECTID
) {
1261 if (bytenr
> last_byte
) {
1262 ret
= create_image_file_range(trans
, root
, objectid
,
1263 &btrfs_inode
, last_byte
,
1268 ret
= btrfs_record_file_extent(trans
, root
, objectid
,
1269 &btrfs_inode
, bytenr
, bytenr
,
1273 last_byte
= bytenr
+ num_bytes
;
1274 btrfs_release_path(&path
);
1276 if (trans
->blocks_used
>= 4096) {
1277 ret
= btrfs_commit_transaction(trans
, root
);
1279 trans
= btrfs_start_transaction(root
, 1);
1283 btrfs_release_path(&path
);
1284 if (total_bytes
> last_byte
) {
1285 ret
= create_image_file_range(trans
, root
, objectid
,
1286 &btrfs_inode
, last_byte
,
1287 total_bytes
, ext2_fs
);
1292 ret
= btrfs_insert_inode(trans
, root
, objectid
, &btrfs_inode
);
1296 location
.objectid
= objectid
;
1297 location
.offset
= 0;
1298 btrfs_set_key_type(&location
, BTRFS_INODE_ITEM_KEY
);
1299 ret
= btrfs_insert_dir_item(trans
, root
, name
, strlen(name
),
1300 btrfs_root_dirid(&root
->root_item
),
1301 &location
, EXT2_FT_REG_FILE
, objectid
);
1304 ret
= btrfs_insert_inode_ref(trans
, root
, name
, strlen(name
),
1306 btrfs_root_dirid(&root
->root_item
),
1310 location
.objectid
= btrfs_root_dirid(&root
->root_item
);
1311 location
.offset
= 0;
1312 btrfs_set_key_type(&location
, BTRFS_INODE_ITEM_KEY
);
1313 ret
= btrfs_lookup_inode(trans
, root
, &path
, &location
, 1);
1316 leaf
= path
.nodes
[0];
1317 inode_item
= btrfs_item_ptr(leaf
, path
.slots
[0],
1318 struct btrfs_inode_item
);
1319 btrfs_set_inode_size(leaf
, inode_item
, strlen(name
) * 2 +
1320 btrfs_inode_size(leaf
, inode_item
));
1321 btrfs_mark_buffer_dirty(leaf
);
1322 btrfs_release_path(&path
);
1323 ret
= btrfs_commit_transaction(trans
, root
);
1326 btrfs_release_path(&path
);
1330 static struct btrfs_root
* link_subvol(struct btrfs_root
*root
,
1331 const char *base
, u64 root_objectid
)
1333 struct btrfs_trans_handle
*trans
;
1334 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1335 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
1336 struct btrfs_root
*new_root
= NULL
;
1337 struct btrfs_path
*path
;
1338 struct btrfs_inode_item
*inode_item
;
1339 struct extent_buffer
*leaf
;
1340 struct btrfs_key key
;
1341 u64 dirid
= btrfs_root_dirid(&root
->root_item
);
1343 char buf
[BTRFS_NAME_LEN
+ 1]; /* for snprintf null */
1349 if (len
< 1 || len
> BTRFS_NAME_LEN
)
1352 path
= btrfs_alloc_path();
1355 key
.objectid
= dirid
;
1356 key
.type
= BTRFS_DIR_INDEX_KEY
;
1357 key
.offset
= (u64
)-1;
1359 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1362 if (path
->slots
[0] > 0) {
1364 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1365 if (key
.objectid
== dirid
&& key
.type
== BTRFS_DIR_INDEX_KEY
)
1366 index
= key
.offset
+ 1;
1368 btrfs_release_path(path
);
1370 trans
= btrfs_start_transaction(root
, 1);
1373 key
.objectid
= dirid
;
1375 key
.type
= BTRFS_INODE_ITEM_KEY
;
1377 ret
= btrfs_lookup_inode(trans
, root
, path
, &key
, 1);
1379 leaf
= path
->nodes
[0];
1380 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1381 struct btrfs_inode_item
);
1383 key
.objectid
= root_objectid
;
1384 key
.offset
= (u64
)-1;
1385 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1387 memcpy(buf
, base
, len
);
1388 for (i
= 0; i
< 1024; i
++) {
1389 ret
= btrfs_insert_dir_item(trans
, root
, buf
, len
,
1390 dirid
, &key
, BTRFS_FT_DIR
, index
);
1393 len
= snprintf(buf
, ARRAY_SIZE(buf
), "%s%d", base
, i
);
1394 if (len
< 1 || len
> BTRFS_NAME_LEN
) {
1402 btrfs_set_inode_size(leaf
, inode_item
, len
* 2 +
1403 btrfs_inode_size(leaf
, inode_item
));
1404 btrfs_mark_buffer_dirty(leaf
);
1405 btrfs_release_path(path
);
1407 /* add the backref first */
1408 ret
= btrfs_add_root_ref(trans
, tree_root
, root_objectid
,
1409 BTRFS_ROOT_BACKREF_KEY
,
1410 root
->root_key
.objectid
,
1411 dirid
, index
, buf
, len
);
1414 /* now add the forward ref */
1415 ret
= btrfs_add_root_ref(trans
, tree_root
, root
->root_key
.objectid
,
1416 BTRFS_ROOT_REF_KEY
, root_objectid
,
1417 dirid
, index
, buf
, len
);
1419 ret
= btrfs_commit_transaction(trans
, root
);
1422 new_root
= btrfs_read_fs_root(fs_info
, &key
);
1423 if (IS_ERR(new_root
))
1426 btrfs_free_path(path
);
1430 static int create_chunk_mapping(struct btrfs_trans_handle
*trans
,
1431 struct btrfs_root
*root
)
1433 struct btrfs_fs_info
*info
= root
->fs_info
;
1434 struct btrfs_root
*chunk_root
= info
->chunk_root
;
1435 struct btrfs_root
*extent_root
= info
->extent_root
;
1436 struct btrfs_device
*device
;
1437 struct btrfs_block_group_cache
*cache
;
1438 struct btrfs_dev_extent
*extent
;
1439 struct extent_buffer
*leaf
;
1440 struct btrfs_chunk chunk
;
1441 struct btrfs_key key
;
1442 struct btrfs_path path
;
1448 btrfs_init_path(&path
);
1450 total_bytes
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
1451 chunk_objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
1453 BUG_ON(list_empty(&info
->fs_devices
->devices
));
1454 device
= list_entry(info
->fs_devices
->devices
.next
,
1455 struct btrfs_device
, dev_list
);
1456 BUG_ON(device
->devid
!= info
->fs_devices
->latest_devid
);
1458 /* delete device extent created by make_btrfs */
1459 key
.objectid
= device
->devid
;
1461 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1462 ret
= btrfs_search_slot(trans
, device
->dev_root
, &key
, &path
, -1, 1);
1467 ret
= btrfs_del_item(trans
, device
->dev_root
, &path
);
1470 btrfs_release_path(&path
);
1472 /* delete chunk item created by make_btrfs */
1473 key
.objectid
= chunk_objectid
;
1475 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
1476 ret
= btrfs_search_slot(trans
, chunk_root
, &key
, &path
, -1, 1);
1481 ret
= btrfs_del_item(trans
, chunk_root
, &path
);
1484 btrfs_release_path(&path
);
1486 /* for each block group, create device extent and chunk item */
1488 while (cur_start
< total_bytes
) {
1489 cache
= btrfs_lookup_block_group(root
->fs_info
, cur_start
);
1492 /* insert device extent */
1493 key
.objectid
= device
->devid
;
1494 key
.offset
= cache
->key
.objectid
;
1495 key
.type
= BTRFS_DEV_EXTENT_KEY
;
1496 ret
= btrfs_insert_empty_item(trans
, device
->dev_root
, &path
,
1497 &key
, sizeof(*extent
));
1501 leaf
= path
.nodes
[0];
1502 extent
= btrfs_item_ptr(leaf
, path
.slots
[0],
1503 struct btrfs_dev_extent
);
1505 btrfs_set_dev_extent_chunk_tree(leaf
, extent
,
1506 chunk_root
->root_key
.objectid
);
1507 btrfs_set_dev_extent_chunk_objectid(leaf
, extent
,
1509 btrfs_set_dev_extent_chunk_offset(leaf
, extent
,
1510 cache
->key
.objectid
);
1511 btrfs_set_dev_extent_length(leaf
, extent
, cache
->key
.offset
);
1512 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
1513 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent
),
1515 btrfs_mark_buffer_dirty(leaf
);
1516 btrfs_release_path(&path
);
1518 /* insert chunk item */
1519 btrfs_set_stack_chunk_length(&chunk
, cache
->key
.offset
);
1520 btrfs_set_stack_chunk_owner(&chunk
,
1521 extent_root
->root_key
.objectid
);
1522 btrfs_set_stack_chunk_stripe_len(&chunk
, BTRFS_STRIPE_LEN
);
1523 btrfs_set_stack_chunk_type(&chunk
, cache
->flags
);
1524 btrfs_set_stack_chunk_io_align(&chunk
, device
->io_align
);
1525 btrfs_set_stack_chunk_io_width(&chunk
, device
->io_width
);
1526 btrfs_set_stack_chunk_sector_size(&chunk
, device
->sector_size
);
1527 btrfs_set_stack_chunk_num_stripes(&chunk
, 1);
1528 btrfs_set_stack_chunk_sub_stripes(&chunk
, 0);
1529 btrfs_set_stack_stripe_devid(&chunk
.stripe
, device
->devid
);
1530 btrfs_set_stack_stripe_offset(&chunk
.stripe
,
1531 cache
->key
.objectid
);
1532 memcpy(&chunk
.stripe
.dev_uuid
, device
->uuid
, BTRFS_UUID_SIZE
);
1534 key
.objectid
= chunk_objectid
;
1535 key
.offset
= cache
->key
.objectid
;
1536 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
1538 ret
= btrfs_insert_item(trans
, chunk_root
, &key
, &chunk
,
1539 btrfs_chunk_item_size(1));
1543 cur_start
= cache
->key
.objectid
+ cache
->key
.offset
;
1546 device
->bytes_used
= total_bytes
;
1547 ret
= btrfs_update_device(trans
, device
);
1549 btrfs_release_path(&path
);
1553 static int create_subvol(struct btrfs_trans_handle
*trans
,
1554 struct btrfs_root
*root
, u64 root_objectid
)
1556 struct extent_buffer
*tmp
;
1557 struct btrfs_root
*new_root
;
1558 struct btrfs_key key
;
1559 struct btrfs_root_item root_item
;
1562 ret
= btrfs_copy_root(trans
, root
, root
->node
, &tmp
,
1566 memcpy(&root_item
, &root
->root_item
, sizeof(root_item
));
1567 btrfs_set_root_bytenr(&root_item
, tmp
->start
);
1568 btrfs_set_root_level(&root_item
, btrfs_header_level(tmp
));
1569 btrfs_set_root_generation(&root_item
, trans
->transid
);
1570 free_extent_buffer(tmp
);
1572 key
.objectid
= root_objectid
;
1573 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1574 key
.offset
= trans
->transid
;
1575 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
,
1578 key
.offset
= (u64
)-1;
1579 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
);
1580 BUG_ON(!new_root
|| IS_ERR(new_root
));
1582 ret
= btrfs_make_root_dir(trans
, new_root
, BTRFS_FIRST_FREE_OBJECTID
);
1588 static int init_btrfs(struct btrfs_root
*root
)
1591 struct btrfs_key location
;
1592 struct btrfs_trans_handle
*trans
;
1593 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1594 struct extent_buffer
*tmp
;
1596 trans
= btrfs_start_transaction(root
, 1);
1598 ret
= btrfs_make_block_groups(trans
, root
);
1601 ret
= btrfs_fix_block_accounting(trans
, root
);
1604 ret
= create_chunk_mapping(trans
, root
);
1607 ret
= btrfs_make_root_dir(trans
, fs_info
->tree_root
,
1608 BTRFS_ROOT_TREE_DIR_OBJECTID
);
1611 memcpy(&location
, &root
->root_key
, sizeof(location
));
1612 location
.offset
= (u64
)-1;
1613 ret
= btrfs_insert_dir_item(trans
, fs_info
->tree_root
, "default", 7,
1614 btrfs_super_root_dir(fs_info
->super_copy
),
1615 &location
, BTRFS_FT_DIR
, 0);
1618 ret
= btrfs_insert_inode_ref(trans
, fs_info
->tree_root
, "default", 7,
1620 btrfs_super_root_dir(fs_info
->super_copy
), 0);
1623 btrfs_set_root_dirid(&fs_info
->fs_root
->root_item
,
1624 BTRFS_FIRST_FREE_OBJECTID
);
1626 /* subvol for ext2 image file */
1627 ret
= create_subvol(trans
, root
, EXT2_IMAGE_SUBVOL_OBJECTID
);
1629 /* subvol for data relocation */
1630 ret
= create_subvol(trans
, root
, BTRFS_DATA_RELOC_TREE_OBJECTID
);
1633 extent_buffer_get(fs_info
->csum_root
->node
);
1634 ret
= __btrfs_cow_block(trans
, fs_info
->csum_root
,
1635 fs_info
->csum_root
->node
, NULL
, 0, &tmp
, 0, 0);
1637 free_extent_buffer(tmp
);
1639 ret
= btrfs_commit_transaction(trans
, root
);
1646 * Migrate super block to its default position and zero 0 ~ 16k
1648 static int migrate_super_block(int fd
, u64 old_bytenr
, u32 sectorsize
)
1651 struct extent_buffer
*buf
;
1652 struct btrfs_super_block
*super
;
1656 BUG_ON(sectorsize
< sizeof(*super
));
1657 buf
= malloc(sizeof(*buf
) + sectorsize
);
1661 buf
->len
= sectorsize
;
1662 ret
= pread(fd
, buf
->data
, sectorsize
, old_bytenr
);
1663 if (ret
!= sectorsize
)
1666 super
= (struct btrfs_super_block
*)buf
->data
;
1667 BUG_ON(btrfs_super_bytenr(super
) != old_bytenr
);
1668 btrfs_set_super_bytenr(super
, BTRFS_SUPER_INFO_OFFSET
);
1670 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
1671 ret
= pwrite(fd
, buf
->data
, sectorsize
, BTRFS_SUPER_INFO_OFFSET
);
1672 if (ret
!= sectorsize
)
1679 memset(buf
->data
, 0, sectorsize
);
1680 for (bytenr
= 0; bytenr
< BTRFS_SUPER_INFO_OFFSET
; ) {
1681 len
= BTRFS_SUPER_INFO_OFFSET
- bytenr
;
1682 if (len
> sectorsize
)
1684 ret
= pwrite(fd
, buf
->data
, len
, bytenr
);
1686 fprintf(stderr
, "unable to zero fill device\n");
1700 static int prepare_system_chunk_sb(struct btrfs_super_block
*super
)
1702 struct btrfs_chunk
*chunk
;
1703 struct btrfs_disk_key
*key
;
1704 u32 sectorsize
= btrfs_super_sectorsize(super
);
1706 key
= (struct btrfs_disk_key
*)(super
->sys_chunk_array
);
1707 chunk
= (struct btrfs_chunk
*)(super
->sys_chunk_array
+
1708 sizeof(struct btrfs_disk_key
));
1710 btrfs_set_disk_key_objectid(key
, BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
1711 btrfs_set_disk_key_type(key
, BTRFS_CHUNK_ITEM_KEY
);
1712 btrfs_set_disk_key_offset(key
, 0);
1714 btrfs_set_stack_chunk_length(chunk
, btrfs_super_total_bytes(super
));
1715 btrfs_set_stack_chunk_owner(chunk
, BTRFS_EXTENT_TREE_OBJECTID
);
1716 btrfs_set_stack_chunk_stripe_len(chunk
, BTRFS_STRIPE_LEN
);
1717 btrfs_set_stack_chunk_type(chunk
, BTRFS_BLOCK_GROUP_SYSTEM
);
1718 btrfs_set_stack_chunk_io_align(chunk
, sectorsize
);
1719 btrfs_set_stack_chunk_io_width(chunk
, sectorsize
);
1720 btrfs_set_stack_chunk_sector_size(chunk
, sectorsize
);
1721 btrfs_set_stack_chunk_num_stripes(chunk
, 1);
1722 btrfs_set_stack_chunk_sub_stripes(chunk
, 0);
1723 chunk
->stripe
.devid
= super
->dev_item
.devid
;
1724 btrfs_set_stack_stripe_offset(&chunk
->stripe
, 0);
1725 memcpy(chunk
->stripe
.dev_uuid
, super
->dev_item
.uuid
, BTRFS_UUID_SIZE
);
1726 btrfs_set_super_sys_array_size(super
, sizeof(*key
) + sizeof(*chunk
));
1730 static int prepare_system_chunk(int fd
, u64 sb_bytenr
, u32 sectorsize
)
1733 struct extent_buffer
*buf
;
1734 struct btrfs_super_block
*super
;
1736 BUG_ON(sectorsize
< sizeof(*super
));
1737 buf
= malloc(sizeof(*buf
) + sectorsize
);
1741 buf
->len
= sectorsize
;
1742 ret
= pread(fd
, buf
->data
, sectorsize
, sb_bytenr
);
1743 if (ret
!= sectorsize
)
1746 super
= (struct btrfs_super_block
*)buf
->data
;
1747 BUG_ON(btrfs_super_bytenr(super
) != sb_bytenr
);
1748 BUG_ON(btrfs_super_num_devices(super
) != 1);
1750 ret
= prepare_system_chunk_sb(super
);
1754 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
1755 ret
= pwrite(fd
, buf
->data
, sectorsize
, sb_bytenr
);
1756 if (ret
!= sectorsize
)
1767 static int relocate_one_reference(struct btrfs_trans_handle
*trans
,
1768 struct btrfs_root
*root
,
1769 u64 extent_start
, u64 extent_size
,
1770 struct btrfs_key
*extent_key
,
1771 struct extent_io_tree
*reloc_tree
)
1773 struct extent_buffer
*leaf
;
1774 struct btrfs_file_extent_item
*fi
;
1775 struct btrfs_key key
;
1776 struct btrfs_path path
;
1777 struct btrfs_inode_item inode
;
1778 struct blk_iterate_data data
;
1785 u32 sectorsize
= root
->sectorsize
;
1791 btrfs_init_path(&path
);
1792 ret
= btrfs_search_slot(trans
, root
, extent_key
, &path
, -1, 1);
1796 leaf
= path
.nodes
[0];
1797 fi
= btrfs_item_ptr(leaf
, path
.slots
[0],
1798 struct btrfs_file_extent_item
);
1799 BUG_ON(btrfs_file_extent_offset(leaf
, fi
) > 0);
1800 if (extent_start
!= btrfs_file_extent_disk_bytenr(leaf
, fi
) ||
1801 extent_size
!= btrfs_file_extent_disk_num_bytes(leaf
, fi
)) {
1806 bytenr
= extent_start
+ btrfs_file_extent_offset(leaf
, fi
);
1807 num_bytes
= btrfs_file_extent_num_bytes(leaf
, fi
);
1809 ret
= btrfs_del_item(trans
, root
, &path
);
1813 ret
= btrfs_free_extent(trans
, root
, extent_start
, extent_size
, 0,
1814 root
->root_key
.objectid
,
1815 extent_key
->objectid
, extent_key
->offset
);
1819 btrfs_release_path(&path
);
1821 key
.objectid
= extent_key
->objectid
;
1823 key
.type
= BTRFS_INODE_ITEM_KEY
;
1824 ret
= btrfs_lookup_inode(trans
, root
, &path
, &key
, 0);
1828 leaf
= path
.nodes
[0];
1829 ptr
= btrfs_item_ptr_offset(leaf
, path
.slots
[0]);
1830 read_extent_buffer(leaf
, &inode
, ptr
, sizeof(inode
));
1831 btrfs_release_path(&path
);
1833 BUG_ON(num_bytes
& (sectorsize
- 1));
1834 nbytes
= btrfs_stack_inode_nbytes(&inode
) - num_bytes
;
1835 btrfs_set_stack_inode_nbytes(&inode
, nbytes
);
1836 datacsum
= !(btrfs_stack_inode_flags(&inode
) & BTRFS_INODE_NODATASUM
);
1838 data
= (struct blk_iterate_data
) {
1842 .objectid
= extent_key
->objectid
,
1843 .first_block
= extent_key
->offset
/ sectorsize
,
1846 .boundary
= (u64
)-1,
1847 .checksum
= datacsum
,
1851 cur_offset
= extent_key
->offset
;
1852 while (num_bytes
> 0) {
1853 sector_end
= bytenr
+ sectorsize
- 1;
1854 if (test_range_bit(reloc_tree
, bytenr
, sector_end
,
1855 EXTENT_LOCKED
, 1)) {
1856 ret
= get_state_private(reloc_tree
, bytenr
, &new_pos
);
1859 ret
= custom_alloc_extent(root
, sectorsize
, 0, &key
);
1862 new_pos
= key
.objectid
;
1864 if (cur_offset
== extent_key
->offset
) {
1865 fd
= root
->fs_info
->fs_devices
->latest_bdev
;
1866 readahead(fd
, bytenr
, num_bytes
);
1868 ret
= copy_disk_extent(root
, new_pos
, bytenr
,
1872 ret
= set_extent_bits(reloc_tree
, bytenr
, sector_end
,
1873 EXTENT_LOCKED
, GFP_NOFS
);
1875 ret
= set_state_private(reloc_tree
, bytenr
, new_pos
);
1879 ret
= block_iterate_proc(NULL
, new_pos
/ sectorsize
,
1880 cur_offset
/ sectorsize
, &data
);
1881 if (ret
& BLOCK_ABORT
) {
1886 cur_offset
+= sectorsize
;
1887 bytenr
+= sectorsize
;
1888 num_bytes
-= sectorsize
;
1891 if (data
.num_blocks
> 0) {
1892 ret
= record_file_blocks(trans
, root
,
1893 extent_key
->objectid
, &inode
,
1894 data
.first_block
, data
.disk_block
,
1895 data
.num_blocks
, datacsum
);
1900 key
.objectid
= extent_key
->objectid
;
1902 key
.type
= BTRFS_INODE_ITEM_KEY
;
1903 ret
= btrfs_lookup_inode(trans
, root
, &path
, &key
, 1);
1907 leaf
= path
.nodes
[0];
1908 ptr
= btrfs_item_ptr_offset(leaf
, path
.slots
[0]);
1909 write_extent_buffer(leaf
, &inode
, ptr
, sizeof(inode
));
1910 btrfs_mark_buffer_dirty(leaf
);
1911 btrfs_release_path(&path
);
1914 btrfs_release_path(&path
);
1918 static int relocate_extents_range(struct btrfs_root
*fs_root
,
1919 struct btrfs_root
*ext2_root
,
1920 u64 start_byte
, u64 end_byte
)
1922 struct btrfs_fs_info
*info
= fs_root
->fs_info
;
1923 struct btrfs_root
*extent_root
= info
->extent_root
;
1924 struct btrfs_root
*cur_root
= NULL
;
1925 struct btrfs_trans_handle
*trans
;
1926 struct btrfs_extent_data_ref
*dref
;
1927 struct btrfs_extent_inline_ref
*iref
;
1928 struct btrfs_extent_item
*ei
;
1929 struct extent_buffer
*leaf
;
1930 struct btrfs_key key
;
1931 struct btrfs_key extent_key
;
1932 struct btrfs_path path
;
1933 struct extent_io_tree reloc_tree
;
1943 btrfs_init_path(&path
);
1944 extent_io_tree_init(&reloc_tree
);
1946 key
.objectid
= start_byte
;
1948 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1949 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, &path
, 0, 0);
1953 ret
= btrfs_previous_item(extent_root
, &path
, 0,
1954 BTRFS_EXTENT_ITEM_KEY
);
1958 leaf
= path
.nodes
[0];
1959 btrfs_item_key_to_cpu(leaf
, &key
, path
.slots
[0]);
1960 if (key
.objectid
+ key
.offset
> start_byte
)
1961 start_byte
= key
.objectid
;
1964 btrfs_release_path(&path
);
1966 cur_root
= (pass
% 2 == 0) ? ext2_root
: fs_root
;
1969 trans
= btrfs_start_transaction(cur_root
, 1);
1972 cur_byte
= start_byte
;
1974 key
.objectid
= cur_byte
;
1976 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1977 ret
= btrfs_search_slot(trans
, extent_root
,
1982 leaf
= path
.nodes
[0];
1983 if (path
.slots
[0] >= btrfs_header_nritems(leaf
)) {
1984 ret
= btrfs_next_leaf(extent_root
, &path
);
1989 leaf
= path
.nodes
[0];
1992 btrfs_item_key_to_cpu(leaf
, &key
, path
.slots
[0]);
1993 if (key
.objectid
< cur_byte
||
1994 key
.type
!= BTRFS_EXTENT_ITEM_KEY
) {
1998 if (key
.objectid
>= end_byte
)
2003 cur_byte
= key
.objectid
;
2004 num_bytes
= key
.offset
;
2005 ei
= btrfs_item_ptr(leaf
, path
.slots
[0],
2006 struct btrfs_extent_item
);
2007 BUG_ON(!(btrfs_extent_flags(leaf
, ei
) &
2008 BTRFS_EXTENT_FLAG_DATA
));
2010 ptr
= btrfs_item_ptr_offset(leaf
, path
.slots
[0]);
2011 end
= ptr
+ btrfs_item_size_nr(leaf
, path
.slots
[0]);
2013 ptr
+= sizeof(struct btrfs_extent_item
);
2016 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
2017 key
.type
= btrfs_extent_inline_ref_type(leaf
, iref
);
2018 BUG_ON(key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
);
2019 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
2020 ref_root
= btrfs_extent_data_ref_root(leaf
, dref
);
2021 extent_key
.objectid
=
2022 btrfs_extent_data_ref_objectid(leaf
, dref
);
2024 btrfs_extent_data_ref_offset(leaf
, dref
);
2025 extent_key
.type
= BTRFS_EXTENT_DATA_KEY
;
2026 BUG_ON(btrfs_extent_data_ref_count(leaf
, dref
) != 1);
2028 if (ref_root
== cur_root
->root_key
.objectid
)
2031 ptr
+= btrfs_extent_inline_ref_size(key
.type
);
2039 ret
= relocate_one_reference(trans
, cur_root
, cur_byte
,
2040 num_bytes
, &extent_key
,
2045 cur_byte
+= num_bytes
;
2046 btrfs_release_path(&path
);
2048 if (trans
->blocks_used
>= 4096) {
2049 ret
= btrfs_commit_transaction(trans
, cur_root
);
2051 trans
= btrfs_start_transaction(cur_root
, 1);
2055 btrfs_release_path(&path
);
2057 ret
= btrfs_commit_transaction(trans
, cur_root
);
2060 if (num_extents
> 0 && pass
++ < 16)
2063 ret
= (num_extents
> 0) ? -1 : 0;
2065 btrfs_release_path(&path
);
2066 extent_io_tree_cleanup(&reloc_tree
);
2071 * relocate data in system chunk
2073 static int cleanup_sys_chunk(struct btrfs_root
*fs_root
,
2074 struct btrfs_root
*ext2_root
)
2076 struct btrfs_block_group_cache
*cache
;
2082 cache
= btrfs_lookup_block_group(fs_root
->fs_info
, offset
);
2086 end_byte
= cache
->key
.objectid
+ cache
->key
.offset
;
2087 if (cache
->flags
& BTRFS_BLOCK_GROUP_SYSTEM
) {
2088 ret
= relocate_extents_range(fs_root
, ext2_root
,
2089 cache
->key
.objectid
,
2096 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
2097 offset
= btrfs_sb_offset(i
);
2098 offset
&= ~((u64
)BTRFS_STRIPE_LEN
- 1);
2100 ret
= relocate_extents_range(fs_root
, ext2_root
,
2101 offset
, offset
+ BTRFS_STRIPE_LEN
);
2110 static int fixup_chunk_mapping(struct btrfs_root
*root
)
2112 struct btrfs_trans_handle
*trans
;
2113 struct btrfs_fs_info
*info
= root
->fs_info
;
2114 struct btrfs_root
*chunk_root
= info
->chunk_root
;
2115 struct extent_buffer
*leaf
;
2116 struct btrfs_key key
;
2117 struct btrfs_path path
;
2118 struct btrfs_chunk chunk
;
2124 btrfs_init_path(&path
);
2126 trans
= btrfs_start_transaction(root
, 1);
2130 * recow the whole chunk tree. this will move all chunk tree blocks
2131 * into system block group.
2133 memset(&key
, 0, sizeof(key
));
2135 ret
= btrfs_search_slot(trans
, chunk_root
, &key
, &path
, 0, 1);
2139 ret
= btrfs_next_leaf(chunk_root
, &path
);
2145 btrfs_item_key_to_cpu(path
.nodes
[0], &key
, path
.slots
[0]);
2146 btrfs_release_path(&path
);
2148 btrfs_release_path(&path
);
2150 /* fixup the system chunk array in super block */
2151 btrfs_set_super_sys_array_size(info
->super_copy
, 0);
2153 key
.objectid
= BTRFS_FIRST_CHUNK_TREE_OBJECTID
;
2155 key
.type
= BTRFS_CHUNK_ITEM_KEY
;
2157 ret
= btrfs_search_slot(trans
, chunk_root
, &key
, &path
, 0, 0);
2162 leaf
= path
.nodes
[0];
2163 if (path
.slots
[0] >= btrfs_header_nritems(leaf
)) {
2164 ret
= btrfs_next_leaf(chunk_root
, &path
);
2169 leaf
= path
.nodes
[0];
2171 btrfs_item_key_to_cpu(leaf
, &key
, path
.slots
[0]);
2172 if (key
.type
!= BTRFS_CHUNK_ITEM_KEY
)
2175 ptr
= btrfs_item_ptr_offset(leaf
, path
.slots
[0]);
2176 size
= btrfs_item_size_nr(leaf
, path
.slots
[0]);
2177 BUG_ON(size
!= sizeof(chunk
));
2178 read_extent_buffer(leaf
, &chunk
, ptr
, size
);
2179 type
= btrfs_stack_chunk_type(&chunk
);
2181 if (!(type
& BTRFS_BLOCK_GROUP_SYSTEM
))
2184 ret
= btrfs_add_system_chunk(trans
, chunk_root
, &key
,
2192 ret
= btrfs_commit_transaction(trans
, root
);
2195 btrfs_release_path(&path
);
2199 static int do_convert(const char *devname
, int datacsum
, int packing
, int noxattr
,
2200 int copylabel
, const char *fslabel
)
2208 ext2_filsys ext2_fs
;
2209 struct btrfs_root
*root
;
2210 struct btrfs_root
*ext2_root
;
2212 ret
= open_ext2fs(devname
, &ext2_fs
);
2214 fprintf(stderr
, "unable to open the Ext2fs\n");
2217 blocksize
= ext2_fs
->blocksize
;
2218 total_bytes
= (u64
)ext2_fs
->super
->s_blocks_count
* blocksize
;
2219 if (blocksize
< 4096) {
2220 fprintf(stderr
, "block size is too small\n");
2223 if (!(ext2_fs
->super
->s_feature_incompat
&
2224 EXT2_FEATURE_INCOMPAT_FILETYPE
)) {
2225 fprintf(stderr
, "filetype feature is missing\n");
2228 for (i
= 0; i
< 7; i
++) {
2229 ret
= ext2_alloc_block(ext2_fs
, 0, blocks
+ i
);
2231 fprintf(stderr
, "not enough free space\n");
2234 blocks
[i
] *= blocksize
;
2236 super_bytenr
= blocks
[0];
2237 fd
= open(devname
, O_RDWR
);
2239 fprintf(stderr
, "unable to open %s\n", devname
);
2242 ret
= make_btrfs(fd
, devname
, ext2_fs
->super
->s_volume_name
,
2243 NULL
, blocks
, total_bytes
, blocksize
, blocksize
,
2244 blocksize
, blocksize
, 0);
2246 fprintf(stderr
, "unable to create initial ctree: %s\n",
2250 /* create a system chunk that maps the whole device */
2251 ret
= prepare_system_chunk(fd
, super_bytenr
, blocksize
);
2253 fprintf(stderr
, "unable to update system chunk\n");
2256 root
= open_ctree_fd(fd
, devname
, super_bytenr
, OPEN_CTREE_WRITES
);
2258 fprintf(stderr
, "unable to open ctree\n");
2261 ret
= cache_free_extents(root
, ext2_fs
);
2263 fprintf(stderr
, "error during cache_free_extents %d\n", ret
);
2266 root
->fs_info
->extent_ops
= &extent_ops
;
2267 /* recover block allocation bitmap */
2268 for (i
= 0; i
< 7; i
++) {
2269 blocks
[i
] /= blocksize
;
2270 ext2_free_block(ext2_fs
, blocks
[i
]);
2272 ret
= init_btrfs(root
);
2274 fprintf(stderr
, "unable to setup the root tree\n");
2277 printf("creating btrfs metadata.\n");
2278 ret
= copy_inodes(root
, ext2_fs
, datacsum
, packing
, noxattr
);
2280 fprintf(stderr
, "error during copy_inodes %d\n", ret
);
2283 printf("creating ext2fs image file.\n");
2284 ext2_root
= link_subvol(root
, "ext2_saved", EXT2_IMAGE_SUBVOL_OBJECTID
);
2286 fprintf(stderr
, "unable to create subvol\n");
2289 ret
= create_ext2_image(ext2_root
, ext2_fs
, "image");
2291 fprintf(stderr
, "error during create_ext2_image %d\n", ret
);
2294 memset(root
->fs_info
->super_copy
->label
, 0, BTRFS_LABEL_SIZE
);
2295 if (copylabel
== 1) {
2296 strncpy(root
->fs_info
->super_copy
->label
,
2297 ext2_fs
->super
->s_volume_name
, 16);
2298 fprintf(stderr
, "copy label '%s'\n",
2299 root
->fs_info
->super_copy
->label
);
2300 } else if (copylabel
== -1) {
2301 strncpy(root
->fs_info
->super_copy
->label
, fslabel
, BTRFS_LABEL_SIZE
);
2302 fprintf(stderr
, "set label to '%s'\n", fslabel
);
2305 printf("cleaning up system chunk.\n");
2306 ret
= cleanup_sys_chunk(root
, ext2_root
);
2308 fprintf(stderr
, "error during cleanup_sys_chunk %d\n", ret
);
2311 ret
= close_ctree(root
);
2313 fprintf(stderr
, "error during close_ctree %d\n", ret
);
2316 close_ext2fs(ext2_fs
);
2319 * If this step succeed, we get a mountable btrfs. Otherwise
2320 * the ext2fs is left unchanged.
2322 ret
= migrate_super_block(fd
, super_bytenr
, blocksize
);
2324 fprintf(stderr
, "unable to migrate super block\n");
2328 root
= open_ctree_fd(fd
, devname
, 0, OPEN_CTREE_WRITES
);
2330 fprintf(stderr
, "unable to open ctree\n");
2333 /* move chunk tree into system chunk. */
2334 ret
= fixup_chunk_mapping(root
);
2336 fprintf(stderr
, "error during fixup_chunk_tree\n");
2339 ret
= close_ctree(root
);
2342 printf("conversion complete.\n");
2347 fprintf(stderr
, "conversion aborted.\n");
2351 static int may_rollback(struct btrfs_root
*root
)
2353 struct btrfs_fs_info
*info
= root
->fs_info
;
2354 struct btrfs_multi_bio
*multi
= NULL
;
2362 if (btrfs_super_num_devices(info
->super_copy
) != 1)
2365 bytenr
= BTRFS_SUPER_INFO_OFFSET
;
2366 total_bytes
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
2369 ret
= btrfs_map_block(&info
->mapping_tree
, WRITE
, bytenr
,
2370 &length
, &multi
, 0, NULL
);
2374 num_stripes
= multi
->num_stripes
;
2375 physical
= multi
->stripes
[0].physical
;
2378 if (num_stripes
!= 1 || physical
!= bytenr
)
2382 if (bytenr
>= total_bytes
)
2390 static int do_rollback(const char *devname
)
2395 struct btrfs_root
*root
;
2396 struct btrfs_root
*ext2_root
;
2397 struct btrfs_root
*chunk_root
;
2398 struct btrfs_dir_item
*dir
;
2399 struct btrfs_inode_item
*inode
;
2400 struct btrfs_file_extent_item
*fi
;
2401 struct btrfs_trans_handle
*trans
;
2402 struct extent_buffer
*leaf
;
2403 struct btrfs_block_group_cache
*cache1
;
2404 struct btrfs_block_group_cache
*cache2
;
2405 struct btrfs_key key
;
2406 struct btrfs_path path
;
2407 struct extent_io_tree io_tree
;
2422 extent_io_tree_init(&io_tree
);
2424 fd
= open(devname
, O_RDWR
);
2426 fprintf(stderr
, "unable to open %s\n", devname
);
2429 root
= open_ctree_fd(fd
, devname
, 0, OPEN_CTREE_WRITES
);
2431 fprintf(stderr
, "unable to open ctree\n");
2434 ret
= may_rollback(root
);
2436 fprintf(stderr
, "unable to do rollback\n");
2440 sectorsize
= root
->sectorsize
;
2441 buf
= malloc(sectorsize
);
2443 fprintf(stderr
, "unable to allocate memory\n");
2447 btrfs_init_path(&path
);
2449 key
.objectid
= EXT2_IMAGE_SUBVOL_OBJECTID
;
2450 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2451 key
.offset
= (u64
)-1;
2452 ext2_root
= btrfs_read_fs_root(root
->fs_info
, &key
);
2453 if (!ext2_root
|| IS_ERR(ext2_root
)) {
2454 fprintf(stderr
, "unable to open subvol %llu\n",
2455 (unsigned long long)key
.objectid
);
2460 root_dir
= btrfs_root_dirid(&root
->root_item
);
2461 dir
= btrfs_lookup_dir_item(NULL
, ext2_root
, &path
,
2462 root_dir
, name
, strlen(name
), 0);
2463 if (!dir
|| IS_ERR(dir
)) {
2464 fprintf(stderr
, "unable to find file %s\n", name
);
2467 leaf
= path
.nodes
[0];
2468 btrfs_dir_item_key_to_cpu(leaf
, dir
, &key
);
2469 btrfs_release_path(&path
);
2471 objectid
= key
.objectid
;
2473 ret
= btrfs_lookup_inode(NULL
, ext2_root
, &path
, &key
, 0);
2475 fprintf(stderr
, "unable to find inode item\n");
2478 leaf
= path
.nodes
[0];
2479 inode
= btrfs_item_ptr(leaf
, path
.slots
[0], struct btrfs_inode_item
);
2480 total_bytes
= btrfs_inode_size(leaf
, inode
);
2481 btrfs_release_path(&path
);
2483 key
.objectid
= objectid
;
2485 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2486 ret
= btrfs_search_slot(NULL
, ext2_root
, &key
, &path
, 0, 0);
2488 fprintf(stderr
, "unable to find first file extent\n");
2489 btrfs_release_path(&path
);
2493 /* build mapping tree for the relocated blocks */
2494 for (offset
= 0; offset
< total_bytes
; ) {
2495 leaf
= path
.nodes
[0];
2496 if (path
.slots
[0] >= btrfs_header_nritems(leaf
)) {
2497 ret
= btrfs_next_leaf(root
, &path
);
2503 btrfs_item_key_to_cpu(leaf
, &key
, path
.slots
[0]);
2504 if (key
.objectid
!= objectid
|| key
.offset
!= offset
||
2505 btrfs_key_type(&key
) != BTRFS_EXTENT_DATA_KEY
)
2508 fi
= btrfs_item_ptr(leaf
, path
.slots
[0],
2509 struct btrfs_file_extent_item
);
2510 if (btrfs_file_extent_type(leaf
, fi
) != BTRFS_FILE_EXTENT_REG
)
2512 if (btrfs_file_extent_compression(leaf
, fi
) ||
2513 btrfs_file_extent_encryption(leaf
, fi
) ||
2514 btrfs_file_extent_other_encoding(leaf
, fi
))
2517 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
2518 /* skip holes and direct mapped extents */
2519 if (bytenr
== 0 || bytenr
== offset
)
2522 bytenr
+= btrfs_file_extent_offset(leaf
, fi
);
2523 num_bytes
= btrfs_file_extent_num_bytes(leaf
, fi
);
2525 cache1
= btrfs_lookup_block_group(root
->fs_info
, offset
);
2526 cache2
= btrfs_lookup_block_group(root
->fs_info
,
2527 offset
+ num_bytes
- 1);
2528 if (!cache1
|| cache1
!= cache2
||
2529 (!(cache1
->flags
& BTRFS_BLOCK_GROUP_SYSTEM
) &&
2530 !intersect_with_sb(offset
, num_bytes
)))
2533 set_extent_bits(&io_tree
, offset
, offset
+ num_bytes
- 1,
2534 EXTENT_LOCKED
, GFP_NOFS
);
2535 set_state_private(&io_tree
, offset
, bytenr
);
2537 offset
+= btrfs_file_extent_num_bytes(leaf
, fi
);
2540 btrfs_release_path(&path
);
2542 if (offset
< total_bytes
) {
2543 fprintf(stderr
, "unable to build extent mapping\n");
2547 first_free
= BTRFS_SUPER_INFO_OFFSET
+ 2 * sectorsize
- 1;
2548 first_free
&= ~((u64
)sectorsize
- 1);
2549 /* backup for extent #0 should exist */
2550 if(!test_range_bit(&io_tree
, 0, first_free
- 1, EXTENT_LOCKED
, 1)) {
2551 fprintf(stderr
, "no backup for the first extent\n");
2554 /* force no allocation from system block group */
2555 root
->fs_info
->system_allocs
= -1;
2556 trans
= btrfs_start_transaction(root
, 1);
2559 * recow the whole chunk tree, this will remove all chunk tree blocks
2560 * from system block group
2562 chunk_root
= root
->fs_info
->chunk_root
;
2563 memset(&key
, 0, sizeof(key
));
2565 ret
= btrfs_search_slot(trans
, chunk_root
, &key
, &path
, 0, 1);
2569 ret
= btrfs_next_leaf(chunk_root
, &path
);
2573 btrfs_item_key_to_cpu(path
.nodes
[0], &key
, path
.slots
[0]);
2574 btrfs_release_path(&path
);
2576 btrfs_release_path(&path
);
2581 cache1
= btrfs_lookup_block_group(root
->fs_info
, offset
);
2585 if (cache1
->flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
2586 num_bytes
+= btrfs_block_group_used(&cache1
->item
);
2588 offset
= cache1
->key
.objectid
+ cache1
->key
.offset
;
2590 /* only extent #0 left in system block group? */
2591 if (num_bytes
> first_free
) {
2592 fprintf(stderr
, "unable to empty system block group\n");
2595 /* create a system chunk that maps the whole device */
2596 ret
= prepare_system_chunk_sb(root
->fs_info
->super_copy
);
2598 fprintf(stderr
, "unable to update system chunk\n");
2602 ret
= btrfs_commit_transaction(trans
, root
);
2605 ret
= close_ctree(root
);
2607 fprintf(stderr
, "error during close_ctree %d\n", ret
);
2611 /* zero btrfs super block mirrors */
2612 memset(buf
, 0, sectorsize
);
2613 for (i
= 1 ; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
2614 bytenr
= btrfs_sb_offset(i
);
2615 if (bytenr
>= total_bytes
)
2617 ret
= pwrite(fd
, buf
, sectorsize
, bytenr
);
2620 sb_bytenr
= (u64
)-1;
2621 /* copy all relocated blocks back */
2623 ret
= find_first_extent_bit(&io_tree
, 0, &start
, &end
,
2628 ret
= get_state_private(&io_tree
, start
, &bytenr
);
2631 clear_extent_bits(&io_tree
, start
, end
, EXTENT_LOCKED
,
2634 while (start
<= end
) {
2635 if (start
== BTRFS_SUPER_INFO_OFFSET
) {
2639 ret
= pread(fd
, buf
, sectorsize
, bytenr
);
2641 fprintf(stderr
, "error during pread %d\n", ret
);
2644 BUG_ON(ret
!= sectorsize
);
2645 ret
= pwrite(fd
, buf
, sectorsize
, start
);
2647 fprintf(stderr
, "error during pwrite %d\n", ret
);
2650 BUG_ON(ret
!= sectorsize
);
2652 start
+= sectorsize
;
2653 bytenr
+= sectorsize
;
2659 fprintf(stderr
, "error during fsync %d\n", ret
);
2663 * finally, overwrite btrfs super block.
2665 ret
= pread(fd
, buf
, sectorsize
, sb_bytenr
);
2667 fprintf(stderr
, "error during pread %d\n", ret
);
2670 BUG_ON(ret
!= sectorsize
);
2671 ret
= pwrite(fd
, buf
, sectorsize
, BTRFS_SUPER_INFO_OFFSET
);
2673 fprintf(stderr
, "error during pwrite %d\n", ret
);
2676 BUG_ON(ret
!= sectorsize
);
2679 fprintf(stderr
, "error during fsync %d\n", ret
);
2685 extent_io_tree_cleanup(&io_tree
);
2686 printf("rollback complete.\n");
2693 fprintf(stderr
, "rollback aborted.\n");
2697 static void print_usage(void)
2699 printf("usage: btrfs-convert [-d] [-i] [-n] [-r] [-l label] [-L] device\n");
2700 printf("\t-d disable data checksum\n");
2701 printf("\t-i ignore xattrs and ACLs\n");
2702 printf("\t-n disable packing of small files\n");
2703 printf("\t-r roll back to ext2fs\n");
2704 printf("\t-l LABEL set filesystem label\n");
2705 printf("\t-L use label from converted fs\n");
2708 int main(int argc
, char *argv
[])
2716 int usage_error
= 0;
2718 char *fslabel
= NULL
;
2721 int c
= getopt(argc
, argv
, "dinrl:L");
2739 fslabel
= strdup(optarg
);
2740 if (strlen(fslabel
) > BTRFS_LABEL_SIZE
) {
2742 "warning: label too long, trimmed to %d bytes\n",
2744 fslabel
[BTRFS_LABEL_SIZE
] = 0;
2755 argc
= argc
- optind
;
2757 if (check_argc_exact(argc
, 1)) {
2762 if (rollback
&& (!datacsum
|| noxattr
|| !packing
)) {
2764 "Usage error: -d, -i, -n options do not apply to rollback\n");
2773 file
= argv
[optind
];
2774 ret
= check_mounted(file
);
2776 fprintf(stderr
, "Could not check mount status: %s\n",
2780 fprintf(stderr
, "%s is mounted\n", file
);
2785 ret
= do_rollback(file
);
2787 ret
= do_convert(file
, datacsum
, packing
, noxattr
, copylabel
, fslabel
);