62 static struct ucounts *inc_pid_namespaces(struct user_namespace *ns)  in inc_pid_namespaces()  argument
64 	return inc_ucount(ns, current_euid(), UCOUNT_PID_NAMESPACES);  in inc_pid_namespaces()
75 	struct pid_namespace *ns;  in create_pid_namespace()  local
92 	ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);  in create_pid_namespace()
93 	if (ns == NULL)  in create_pid_namespace()
96 	idr_init(&ns->idr);  in create_pid_namespace()
98 	ns->pid_cachep = create_pid_cachep(level);  in create_pid_namespace()
99 	if (ns->pid_cachep == NULL)  in create_pid_namespace()
102 	err = ns_alloc_inum(&ns->ns);  in create_pid_namespace()
105 	ns->ns.ops = &pidns_operations;  in create_pid_namespace()
107 	refcount_set(&ns->ns.count, 1);  in create_pid_namespace()
108 	ns->level = level;  in create_pid_namespace()
109 	ns->parent = get_pid_ns(parent_pid_ns);  in create_pid_namespace()
110 	ns->user_ns = get_user_ns(user_ns);  in create_pid_namespace()
111 	ns->ucounts = ucounts;  in create_pid_namespace()
112 	ns->pid_allocated = PIDNS_ADDING;  in create_pid_namespace()
114 	ns->memfd_noexec_scope = pidns_memfd_noexec_scope(parent_pid_ns);  in create_pid_namespace()
116 	return ns;  in create_pid_namespace()
119 	idr_destroy(&ns->idr);  in create_pid_namespace()
120 	kmem_cache_free(pid_ns_cachep, ns);  in create_pid_namespace()
129 	struct pid_namespace *ns = container_of(p, struct pid_namespace, rcu);  in delayed_free_pidns()  local
131 	dec_pid_namespaces(ns->ucounts);  in delayed_free_pidns()
132 	put_user_ns(ns->user_ns);  in delayed_free_pidns()
134 	kmem_cache_free(pid_ns_cachep, ns);  in delayed_free_pidns()
137 static void destroy_pid_namespace(struct pid_namespace *ns)  in destroy_pid_namespace()  argument
139 	ns_free_inum(&ns->ns);  in destroy_pid_namespace()
141 	idr_destroy(&ns->idr);  in destroy_pid_namespace()
142 	call_rcu(&ns->rcu, delayed_free_pidns);  in destroy_pid_namespace()
155 void put_pid_ns(struct pid_namespace *ns)  in put_pid_ns()  argument
159 	while (ns != &init_pid_ns) {  in put_pid_ns()
160 		parent = ns->parent;  in put_pid_ns()
161 		if (!refcount_dec_and_test(&ns->ns.count))  in put_pid_ns()
163 		destroy_pid_namespace(ns);  in put_pid_ns()
164 		ns = parent;  in put_pid_ns()
255 		 * 2) TASK A fork() twice -> TASK B (child reaper for new ns)  in zap_pid_ns_processes()
291 	 * Writing directly to ns' last_pid field is OK, since this field  in pid_ns_ctl_handler()
349 static inline struct pid_namespace *to_pid_ns(struct ns_common *ns)  in to_pid_ns()  argument
351 	return container_of(ns, struct pid_namespace, ns);  in to_pid_ns()
356 	struct pid_namespace *ns;  in pidns_get()  local
359 	ns = task_active_pid_ns(task);  in pidns_get()
360 	if (ns)  in pidns_get()
361 		get_pid_ns(ns);  in pidns_get()
364 	return ns ? &ns->ns : NULL;  in pidns_get()
369 	struct pid_namespace *ns = NULL;  in pidns_for_children_get()  local
373 		ns = task->nsproxy->pid_ns_for_children;  in pidns_for_children_get()
374 		get_pid_ns(ns);  in pidns_for_children_get()
378 	if (ns) {  in pidns_for_children_get()
380 		if (!ns->child_reaper) {  in pidns_for_children_get()
381 			put_pid_ns(ns);  in pidns_for_children_get()
382 			ns = NULL;  in pidns_for_children_get()
387 	return ns ? &ns->ns : NULL;  in pidns_for_children_get()
390 static void pidns_put(struct ns_common *ns)  in pidns_put()  argument
392 	put_pid_ns(to_pid_ns(ns));  in pidns_put()
395 static int pidns_install(struct nsset *nsset, struct ns_common *ns)  in pidns_install()  argument
399 	struct pid_namespace *ancestor, *new = to_pid_ns(ns);  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()