42 	/* Level 0 is init_pid_ns.pid_cachep */  in create_pid_cachep()
57 		*pkc = kmem_cache_create(name, len, 0,  in create_pid_cachep()
64 static struct ucounts *inc_pid_namespaces(struct user_namespace *ns)  in inc_pid_namespaces()  argument
66 	return inc_ucount(ns, current_euid(), UCOUNT_PID_NAMESPACES);  in inc_pid_namespaces()
79 	struct pid_namespace *ns;  in create_pid_namespace()  local
96 	ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);  in create_pid_namespace()
97 	if (ns == NULL)  in create_pid_namespace()
100 	idr_init(&ns->idr);  in create_pid_namespace()
102 	ns->pid_cachep = create_pid_cachep(level);  in create_pid_namespace()
103 	if (ns->pid_cachep == NULL)  in create_pid_namespace()
106 	err = ns_common_init(ns);  in create_pid_namespace()
110 	ns->pid_max = PID_MAX_LIMIT;  in create_pid_namespace()
111 	err = register_pidns_sysctls(ns);  in create_pid_namespace()
115 	ns->level = level;  in create_pid_namespace()
116 	ns->parent = get_pid_ns(parent_pid_ns);  in create_pid_namespace()
117 	ns->user_ns = get_user_ns(user_ns);  in create_pid_namespace()
118 	ns->ucounts = ucounts;  in create_pid_namespace()
119 	ns->pid_allocated = PIDNS_ADDING;  in create_pid_namespace()
120 	INIT_WORK(&ns->work, destroy_pid_namespace_work);  in create_pid_namespace()
123 	ns->memfd_noexec_scope = pidns_memfd_noexec_scope(parent_pid_ns);  in create_pid_namespace()
126 	ns_tree_add(ns);  in create_pid_namespace()
127 	return ns;  in create_pid_namespace()
130 	ns_common_free(ns);  in create_pid_namespace()
132 	idr_destroy(&ns->idr);  in create_pid_namespace()
133 	kmem_cache_free(pid_ns_cachep, ns);  in create_pid_namespace()
142 	struct pid_namespace *ns = container_of(p, struct pid_namespace, rcu);  in delayed_free_pidns()  local
144 	dec_pid_namespaces(ns->ucounts);  in delayed_free_pidns()
145 	put_user_ns(ns->user_ns);  in delayed_free_pidns()
147 	kmem_cache_free(pid_ns_cachep, ns);  in delayed_free_pidns()
150 static void destroy_pid_namespace(struct pid_namespace *ns)  in destroy_pid_namespace()  argument
152 	ns_tree_remove(ns);  in destroy_pid_namespace()
153 	unregister_pidns_sysctls(ns);  in destroy_pid_namespace()
155 	ns_common_free(ns);  in destroy_pid_namespace()
157 	idr_destroy(&ns->idr);  in destroy_pid_namespace()
158 	call_rcu(&ns->rcu, delayed_free_pidns);  in destroy_pid_namespace()
163 	struct pid_namespace *ns =  in destroy_pid_namespace_work()  local
169 		parent = ns->parent;  in destroy_pid_namespace_work()
170 		destroy_pid_namespace(ns);  in destroy_pid_namespace_work()
171 		ns = parent;  in destroy_pid_namespace_work()
172 	} while (ns != &init_pid_ns && ns_ref_put(ns));  in destroy_pid_namespace_work()
185 void put_pid_ns(struct pid_namespace *ns)  in put_pid_ns()  argument
187 	if (ns && ns != &init_pid_ns && ns_ref_put(ns))  in put_pid_ns()
188 		schedule_work(&ns->work);  in put_pid_ns()
322 		return 0;  in reboot_pid_ns()
342 	do_exit(0);  in reboot_pid_ns()
345 	return 0;  in reboot_pid_ns()
350 	struct pid_namespace *ns;  in pidns_get()  local
353 	ns = task_active_pid_ns(task);  in pidns_get()
354 	if (ns)  in pidns_get()
355 		get_pid_ns(ns);  in pidns_get()
358 	return ns ? &ns->ns : NULL;  in pidns_get()
363 	struct pid_namespace *ns = NULL;  in pidns_for_children_get()  local
367 		ns = task->nsproxy->pid_ns_for_children;  in pidns_for_children_get()
368 		get_pid_ns(ns);  in pidns_for_children_get()
372 	if (ns) {  in pidns_for_children_get()
374 		if (!ns->child_reaper) {  in pidns_for_children_get()
375 			put_pid_ns(ns);  in pidns_for_children_get()
376 			ns = NULL;  in pidns_for_children_get()
381 	return ns ? &ns->ns : NULL;  in pidns_for_children_get()
384 static void pidns_put(struct ns_common *ns)  in pidns_put()  argument
386 	put_pid_ns(to_pid_ns(ns));  in pidns_put()
392 	struct pid_namespace *ns;  in pidns_is_ancestor()  local
396 	for (ns = child; ns->level > ancestor->level; ns = ns->parent)  in pidns_is_ancestor()
398 	return ns == ancestor;  in pidns_is_ancestor()
401 static int pidns_install(struct nsset *nsset, struct ns_common *ns)  in pidns_install()  argument
405 	struct pid_namespace *new = to_pid_ns(ns);  in pidns_install()
424 	return 0;  in pidns_install()
427 static struct ns_common *pidns_get_parent(struct ns_common *ns)  in pidns_get_parent()  argument
433 	pid_ns = p = to_pid_ns(ns)->parent;  in pidns_get_parent()
442 	return &get_pid_ns(pid_ns)->ns;  in pidns_get_parent()
445 static struct user_namespace *pidns_owner(struct ns_common *ns)  in pidns_owner()  argument
447 	return to_pid_ns(ns)->user_ns;  in pidns_owner()
479 	return 0;  in pid_namespaces_init()