Function btrfsutil_sys::btrfs_util_get_default_subvolume

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

btrfs_util_get_default_subvolume() - Get the default subvolume for a filesystem. @path: Path on a Btrfs filesystem. @id_ret: Returned subvolume ID.

This requires appropriate privilege (CAP_SYS_ADMIN).

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