int mnt_fs_set_userdata(struct libmnt_fs *fs, void *data)
{
	if (!fs)
		return -EINVAL;
	fs->userdata = data;
	return 0;
}
int mnt_fs_set_userdata(struct libmnt_fs *fs, void *data)
{
	if (!fs)
		return -EINVAL;
	fs->userdata = data;
	return 0;
}