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()
76 	struct pid_namespace *ns;  in create_pid_namespace()  local
93 	ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);  in create_pid_namespace()
94 	if (ns == NULL)  in create_pid_namespace()
97 	idr_init(&ns->idr);  in create_pid_namespace()
99 	ns->pid_cachep = create_pid_cachep(level);  in create_pid_namespace()
100 	if (ns->pid_cachep == NULL)  in create_pid_namespace()
103 	err = ns_alloc_inum(&ns->ns);  in create_pid_namespace()
106 	ns->ns.ops = &pidns_operations;  in create_pid_namespace()
108 	refcount_set(&ns->ns.count, 1);  in create_pid_namespace()
109 	ns->level = level;  in create_pid_namespace()
110 	ns->parent = get_pid_ns(parent_pid_ns);  in create_pid_namespace()
111 	ns->user_ns = get_user_ns(user_ns);  in create_pid_namespace()
112 	ns->ucounts = ucounts;  in create_pid_namespace()
113 	ns->pid_allocated = PIDNS_ADDING;  in create_pid_namespace()
115 	ns->memfd_noexec_scope = pidns_memfd_noexec_scope(parent_pid_ns);  in create_pid_namespace()
117 	return ns;  in create_pid_namespace()
120 	idr_destroy(&ns->idr);  in create_pid_namespace()
121 	kmem_cache_free(pid_ns_cachep, ns);  in create_pid_namespace()
130 	struct pid_namespace *ns = container_of(p, struct pid_namespace, rcu);  in delayed_free_pidns()  local
132 	dec_pid_namespaces(ns->ucounts);  in delayed_free_pidns()
133 	put_user_ns(ns->user_ns);  in delayed_free_pidns()
135 	kmem_cache_free(pid_ns_cachep, ns);  in delayed_free_pidns()
138 static void destroy_pid_namespace(struct pid_namespace *ns)  in destroy_pid_namespace()  argument
140 	ns_free_inum(&ns->ns);  in destroy_pid_namespace()
142 	idr_destroy(&ns->idr);  in destroy_pid_namespace()
143 	call_rcu(&ns->rcu, delayed_free_pidns);  in destroy_pid_namespace()
156 void put_pid_ns(struct pid_namespace *ns)  in put_pid_ns()  argument
160 	while (ns != &init_pid_ns) {  in put_pid_ns()
161 		parent = ns->parent;  in put_pid_ns()
162 		if (!refcount_dec_and_test(&ns->ns.count))  in put_pid_ns()
164 		destroy_pid_namespace(ns);  in put_pid_ns()
165 		ns = parent;  in put_pid_ns()
255 		 * 2) TASK A fork() twice -> TASK B (child reaper for new ns)  in zap_pid_ns_processes()
343 static inline struct pid_namespace *to_pid_ns(struct ns_common *ns)  in to_pid_ns()  argument
345 	return container_of(ns, struct pid_namespace, ns);  in to_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()
389 static int pidns_install(struct nsset *nsset, struct ns_common *ns)  in pidns_install()  argument
393 	struct pid_namespace *ancestor, *new = to_pid_ns(ns);  in pidns_install()
421 static struct ns_common *pidns_get_parent(struct ns_common *ns)  in pidns_get_parent()  argument
427 	pid_ns = p = to_pid_ns(ns)->parent;  in pidns_get_parent()
436 	return &get_pid_ns(pid_ns)->ns;  in pidns_get_parent()
439 static struct user_namespace *pidns_owner(struct ns_common *ns)  in pidns_owner()  argument
441 	return to_pid_ns(ns)->user_ns;  in pidns_owner()