75 	struct pid_namespace *ns = container_of(work, struct pid_namespace, proc_work);  in proc_cleanup_work()  local
76 	pid_ns_release_proc(ns);  in proc_cleanup_work()
85 	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 	ns->pidmap[0].page = kzalloc(PAGE_SIZE, GFP_KERNEL);  in create_pid_namespace()
101 	if (!ns->pidmap[0].page)  in create_pid_namespace()
104 	ns->pid_cachep = create_pid_cachep(level + 1);  in create_pid_namespace()
105 	if (ns->pid_cachep == NULL)  in create_pid_namespace()
108 	err = ns_alloc_inum(&ns->ns);  in create_pid_namespace()
111 	ns->ns.ops = &pidns_operations;  in create_pid_namespace()
113 	kref_init(&ns->kref);  in create_pid_namespace()
114 	ns->level = level;  in create_pid_namespace()
115 	ns->parent = get_pid_ns(parent_pid_ns);  in create_pid_namespace()
116 	ns->user_ns = get_user_ns(user_ns);  in create_pid_namespace()
117 	ns->nr_hashed = PIDNS_HASH_ADDING;  in create_pid_namespace()
118 	INIT_WORK(&ns->proc_work, proc_cleanup_work);  in create_pid_namespace()
120 	set_bit(0, ns->pidmap[0].page);  in create_pid_namespace()
121 	atomic_set(&ns->pidmap[0].nr_free, BITS_PER_PAGE - 1);  in create_pid_namespace()
124 		atomic_set(&ns->pidmap[i].nr_free, BITS_PER_PAGE);  in create_pid_namespace()
126 	return ns;  in create_pid_namespace()
129 	kfree(ns->pidmap[0].page);  in create_pid_namespace()
131 	kmem_cache_free(pid_ns_cachep, ns);  in create_pid_namespace()
142 static void destroy_pid_namespace(struct pid_namespace *ns)  in destroy_pid_namespace()  argument
146 	ns_free_inum(&ns->ns);  in destroy_pid_namespace()
148 		kfree(ns->pidmap[i].page);  in destroy_pid_namespace()
149 	put_user_ns(ns->user_ns);  in destroy_pid_namespace()
150 	call_rcu(&ns->rcu, delayed_free_pidns);  in destroy_pid_namespace()
165 	struct pid_namespace *ns;  in free_pid_ns()  local
167 	ns = container_of(kref, struct pid_namespace, kref);  in free_pid_ns()
168 	destroy_pid_namespace(ns);  in free_pid_ns()
171 void put_pid_ns(struct pid_namespace *ns)  in put_pid_ns()  argument
175 	while (ns != &init_pid_ns) {  in put_pid_ns()
176 		parent = ns->parent;  in put_pid_ns()
177 		if (!kref_put(&ns->kref, free_pid_ns))  in put_pid_ns()
179 		ns = parent;  in put_pid_ns()
337 static inline struct pid_namespace *to_pid_ns(struct ns_common *ns)  in to_pid_ns()  argument
339 	return container_of(ns, struct pid_namespace, ns);  in to_pid_ns()
344 	struct pid_namespace *ns;  in pidns_get()  local
347 	ns = task_active_pid_ns(task);  in pidns_get()
348 	if (ns)  in pidns_get()
349 		get_pid_ns(ns);  in pidns_get()
352 	return ns ? &ns->ns : NULL;  in pidns_get()
355 static void pidns_put(struct ns_common *ns)  in pidns_put()  argument
357 	put_pid_ns(to_pid_ns(ns));  in pidns_put()
360 static int pidns_install(struct nsproxy *nsproxy, struct ns_common *ns)  in pidns_install()  argument
363 	struct pid_namespace *ancestor, *new = to_pid_ns(ns);  in pidns_install()