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btrfs-progs: Introduce change_header_uuid function 

This function is used to change fsid and chunk_tree_uuid of a node/leaf.
The function does it without transaction protection.

This is the basis of offline uuid change.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Qu Wenruo 2015-05-11 16:08:47 +08:00 committed by David Sterba
parent 92b020ee04
commit 0c8b978881
3 changed files with 34 additions and 1 deletions
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32
btrfstune.c
View File

@ -98,6 +98,38 @@ static int enable_skinny_metadata(struct btrfs_root *root)
return 0;
}
static int change_header_uuid(struct btrfs_root *root, struct extent_buffer *eb)
{
struct btrfs_fs_info *fs_info = root->fs_info;
int same_fsid = 1;
int same_chunk_tree_uuid = 1;
int ret;
/* Check for whether we need to change fs/chunk id */
if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid)
return 0;
if (fs_info->new_fsid)
same_fsid = !memcmp_extent_buffer(eb, fs_info->new_fsid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
if (fs_info->new_chunk_tree_uuid)
same_chunk_tree_uuid =
!memcmp_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(eb),
BTRFS_UUID_SIZE);
if (same_fsid && same_chunk_tree_uuid)
return 0;
if (!same_fsid)
write_extent_buffer(eb, fs_info->new_fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
if (!same_chunk_tree_uuid)
write_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(eb),
BTRFS_UUID_SIZE);
ret = write_tree_block(NULL, root, eb);
return ret;
}
static void print_usage(void)
{
fprintf(stderr, "usage: btrfstune [options] device\n");

2
ctree.h
View File

@ -955,7 +955,9 @@ struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
u8 fsid[BTRFS_FSID_SIZE];
u8 *new_fsid;
u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
u8 *new_chunk_tree_uuid;
struct btrfs_root *fs_root;
struct btrfs_root *extent_root;
struct btrfs_root *tree_root;

1
props.c
View File

@ -187,7 +187,6 @@ out:
return ret;
}
const struct prop_handler prop_handlers[] = {
{"ro", "Set/get read-only flag of subvolume.", 0, prop_object_subvol,
prop_read_only},