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btrfs-progs: Introduce change_device_uuid function 

This function changes a device items uuid.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Qu Wenruo 2015-05-11 16:08:49 +08:00 committed by David Sterba
parent 605621993d
commit cff8aa2313
1 changed files with 21 additions and 0 deletions
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21
btrfstune.c
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@ -198,6 +198,27 @@ out:
return ret;
}
static int change_device_uuid(struct btrfs_root *root, struct extent_buffer *eb,
int slot)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_dev_item *di;
int ret = 0;
di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item);
if (fs_info->new_fsid) {
if (!memcmp_extent_buffer(eb, fs_info->new_fsid,
(unsigned long)btrfs_device_fsid(di),
BTRFS_FSID_SIZE))
return ret;
write_extent_buffer(eb, fs_info->new_fsid,
(unsigned long)btrfs_device_fsid(di),
BTRFS_FSID_SIZE);
ret = write_tree_block(NULL, root, eb);
}
return ret;
}
static void print_usage(void)
{
fprintf(stderr, "usage: btrfstune [options] device\n");