fs: btrfs: Introduce function to resolve the path of one subvolume

This patch introduces a new function, list_one_subvol(), which will
resolve the path to FS_TREE of one subvolume.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek BehĂșn <marek.behun@nic.cz>
1 file changed