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author | Liu Bo <bo.li.liu@oracle.com> | 2013-06-22 13:32:45 +0800 |
---|---|---|
committer | Chris Mason <chris.mason@fusionio.com> | 2013-07-03 14:16:10 -0400 |
commit | 095e21af458b9c40fc90b3f6901e4c7f2c6d0dd5 (patch) | |
tree | d55d3799068194806c8a05f6af89aee5667c2ad7 /disk-io.h | |
parent | aa88c0ac37cddd4690c7fb427018276788618621 (diff) | |
download | btrfs-progs-095e21af458b9c40fc90b3f6901e4c7f2c6d0dd5.tar.gz |
Btrfs-progs: enhance btrfs-image to restore image onto multiple disks
This adds a 'btrfs-image -m' option, which let us restore an image that
is built from a btrfs of multiple disks onto several disks altogether.
This aims to address the following case,
$ mkfs.btrfs -m raid0 sda sdb
$ btrfs-image sda image.file
$ btrfs-image -r image.file sdc
---------
so we can only restore metadata onto sdc, and another thing is we can
only mount sdc with degraded mode as we don't provide informations of
another disk. And, it's built as RAID0 and we have only one disk,
so after mount sdc we'll get into readonly mode.
This is just annoying for people(like me) who're trying to restore image
but turn to find they cannot make it work.
So this'll make your life easier, just tap
$ btrfs-image -m image.file sdc sdd
---------
then you get everything about metadata done, the same offset with that of
the originals(of course, you need offer enough disk size, at least the disk
size of the original disks).
Besides, this also works with raid5 and raid6 metadata image.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'disk-io.h')
-rw-r--r-- | disk-io.h | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -35,10 +35,13 @@ static inline u64 btrfs_sb_offset(int mirror) struct btrfs_device; +int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror); struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, u64 parent_transid); int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, u64 parent_transid); +int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, + struct extent_buffer *eb); struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize); @@ -50,6 +53,9 @@ int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes); struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr, int writes); +struct btrfs_fs_info *open_ctree_fs_info_restore(const char *filename, + u64 sb_bytenr, u64 root_tree_bytenr, + int writes, int partial); struct btrfs_fs_info *open_ctree_fs_info(const char *filename, u64 sb_bytenr, u64 root_tree_bytenr, int writes, int partial); |