Function mqfs_prison_remove

freebsd/kern/uipc_mqueue.c:1561–1591

* See if this prison root is obsolete, and clean up associated queues if it is. */

 * See if this prison root is obsolete, and clean up associated queues if it is.
 */
static int
mqfs_prison_remove(void *obj, void *data __unused)
{
	const struct prison *pr = obj;
	struct prison *tpr;
	struct mqfs_node *pn, *tpn;
	int found;

	found = 0;
	TAILQ_FOREACH(tpr, &allprison, pr_list) {
		prison_lock(tpr);
		if (tpr != pr && prison_isvalid(tpr) &&
		    tpr->pr_root == pr->pr_root)
			found = 1;
		prison_unlock(tpr);
	}
	if (!found) {
		/*
		 * No jails are rooted in this directory anymore,
		 * so no queues should be either.
		 */
		sx_xlock(&mqfs_data.mi_lock);
		LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children,
		    mn_sibling, tpn) {
			if (pn->mn_pr_root == pr->pr_root)
				(void)do_unlink(pn, curthread->td_ucred);
		}
		sx_xunlock(&mqfs_data.mi_lock);
	}
	return (0);
}

/*
 * Allocate a message queue