Function btrfsutil_sys::btrfs_util_subvolume_id

pub unsafe extern "C" fn btrfs_util_subvolume_id(
    path: *const c_char, 
    id_ret: *mut u64
) -> btrfs_util_error

btrfs_util_subvolume_id() - Get the ID of the subvolume containing a path. @path: Path on a Btrfs filesystem. @id_ret: Returned subvolume ID.

Return: %BTRFS_UTIL_OK on success, non-zero error code on failure.