/* implement "/proc/keys" to provides a list of the keys on the system  */
static struct rb_node* __key_user_next(struct rb_node *n)
/* implement "/proc/keys" to provides a list of the keys on the system  */
static struct rb_node* __key_user_next(struct rb_node *n)
{
	while (n) {
		struct key_user *user = rb_entry(n, struct key_user, node);
		if (user->user_ns == current_user_ns())
			break;
		n = rb_next(n);
	}
	return n;
}