63 static struct ucounts *inc_pid_namespaces(struct user_namespace *ns)  in inc_pid_namespaces()  argument
65 	return inc_ucount(ns, current_euid(), UCOUNT_PID_NAMESPACES);  in inc_pid_namespaces()
78 	struct pid_namespace *ns;  in create_pid_namespace()  local
95 	ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);  in create_pid_namespace()
96 	if (ns == NULL)  in create_pid_namespace()
99 	idr_init(&ns->idr);  in create_pid_namespace()
101 	ns->pid_cachep = create_pid_cachep(level);  in create_pid_namespace()
102 	if (ns->pid_cachep == NULL)  in create_pid_namespace()
105 	err = ns_alloc_inum(&ns->ns);  in create_pid_namespace()
108 	ns->ns.ops = &pidns_operations;  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 	refcount_set(&ns->ns.count, 1);  in create_pid_namespace()
116 	ns->level = level;  in create_pid_namespace()
117 	ns->parent = get_pid_ns(parent_pid_ns);  in create_pid_namespace()
118 	ns->user_ns = get_user_ns(user_ns);  in create_pid_namespace()
119 	ns->ucounts = ucounts;  in create_pid_namespace()
120 	ns->pid_allocated = PIDNS_ADDING;  in create_pid_namespace()
121 	INIT_WORK(&ns->work, destroy_pid_namespace_work);  in create_pid_namespace()
124 	ns->memfd_noexec_scope = pidns_memfd_noexec_scope(parent_pid_ns);  in create_pid_namespace()
127 	return ns;  in create_pid_namespace()
130 	ns_free_inum(&ns->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 	unregister_pidns_sysctls(ns);  in destroy_pid_namespace()
154 	ns_free_inum(&ns->ns);  in destroy_pid_namespace()
156 	idr_destroy(&ns->idr);  in destroy_pid_namespace()
157 	call_rcu(&ns->rcu, delayed_free_pidns);  in destroy_pid_namespace()
162 	struct pid_namespace *ns =  in destroy_pid_namespace_work()  local
168 		parent = ns->parent;  in destroy_pid_namespace_work()
169 		destroy_pid_namespace(ns);  in destroy_pid_namespace_work()
170 		ns = parent;  in destroy_pid_namespace_work()
171 	} while (ns != &init_pid_ns && refcount_dec_and_test(&ns->ns.count));  in destroy_pid_namespace_work()
184 void put_pid_ns(struct pid_namespace *ns)  in put_pid_ns()  argument
186 	if (ns && ns != &init_pid_ns && refcount_dec_and_test(&ns->ns.count))  in put_pid_ns()
187 		schedule_work(&ns->work);  in put_pid_ns()
347 static inline struct pid_namespace *to_pid_ns(struct ns_common *ns)  in to_pid_ns()  argument
349 	return container_of(ns, struct pid_namespace, ns);  in to_pid_ns()
354 	struct pid_namespace *ns;  in pidns_get()  local
357 	ns = task_active_pid_ns(task);  in pidns_get()
358 	if (ns)  in pidns_get()
359 		get_pid_ns(ns);  in pidns_get()
362 	return ns ? &ns->ns : NULL;  in pidns_get()
367 	struct pid_namespace *ns = NULL;  in pidns_for_children_get()  local
371 		ns = task->nsproxy->pid_ns_for_children;  in pidns_for_children_get()
372 		get_pid_ns(ns);  in pidns_for_children_get()
376 	if (ns) {  in pidns_for_children_get()
378 		if (!ns->child_reaper) {  in pidns_for_children_get()
379 			put_pid_ns(ns);  in pidns_for_children_get()
380 			ns = NULL;  in pidns_for_children_get()
385 	return ns ? &ns->ns : NULL;  in pidns_for_children_get()
388 static void pidns_put(struct ns_common *ns)  in pidns_put()  argument
390 	put_pid_ns(to_pid_ns(ns));  in pidns_put()
393 static int pidns_install(struct nsset *nsset, struct ns_common *ns)  in pidns_install()  argument
397 	struct pid_namespace *ancestor, *new = to_pid_ns(ns);  in pidns_install()
425 static struct ns_common *pidns_get_parent(struct ns_common *ns)  in pidns_get_parent()  argument
431 	pid_ns = p = to_pid_ns(ns)->parent;  in pidns_get_parent()
440 	return &get_pid_ns(pid_ns)->ns;  in pidns_get_parent()
443 static struct user_namespace *pidns_owner(struct ns_common *ns)  in pidns_owner()  argument
445 	return to_pid_ns(ns)->user_ns;  in pidns_owner()