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: NQu Wenruo <wqu@suse.com> Reviewed-by: NMarek Behún <marek.behun@nic.cz>
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