44 struct pid init_struct_pid = INIT_STRUCT_PID;
87 	struct pid *pid;  in is_container_init()  local
90 	pid = task_pid(tsk);  in is_container_init()
91 	if (pid != NULL && pid->numbers[pid->level].nr == 1)  in is_container_init()
127 	int i, offset, max_scan, pid, last = pid_ns->last_pid;  in alloc_pidmap()  local
130 	pid = last + 1;  in alloc_pidmap()
131 	if (pid >= pid_max)  in alloc_pidmap()
132 		pid = RESERVED_PIDS;  in alloc_pidmap()
133 	offset = pid & BITS_PER_PAGE_MASK;  in alloc_pidmap()
134 	map = &pid_ns->pidmap[pid/BITS_PER_PAGE];  in alloc_pidmap()
156 					pid_ns->last_pid = pid;  in alloc_pidmap()
157 					return pid;  in alloc_pidmap()
160 				pid = mk_pid(pid_ns, map, offset);  in alloc_pidmap()
167 			} while (offset < BITS_PER_PAGE && pid < pid_max &&  in alloc_pidmap()
168 					(i != max_scan || pid < last ||  in alloc_pidmap()
180 		pid = mk_pid(pid_ns, map, offset);  in alloc_pidmap()
203 void put_pid(struct pid *pid)  in put_pid()  argument
207 	if (!pid)  in put_pid()
210 	ns = pid->numbers[pid->level].ns;  in put_pid()
211 	if ((atomic_read(&pid->count) == 1) ||  in put_pid()
212 	     atomic_dec_and_test(&pid->count)) {  in put_pid()
213 		kmem_cache_free(ns->pid_cachep, pid);  in put_pid()
221 	struct pid *pid = container_of(rhp, struct pid, rcu);  in delayed_put_pid()  local
222 	put_pid(pid);  in delayed_put_pid()
225 void free_pid(struct pid *pid)  in free_pid()  argument
232 	for (i = 0; i <= pid->level; i++)  in free_pid()
233 		hlist_del_rcu(&pid->numbers[i].pid_chain);  in free_pid()
236 	for (i = 0; i <= pid->level; i++)  in free_pid()
237 		free_pidmap(pid->numbers + i);  in free_pid()
239 	call_rcu(&pid->rcu, delayed_put_pid);  in free_pid()
242 struct pid *alloc_pid(struct pid_namespace *ns)  in alloc_pid()
244 	struct pid *pid;  in alloc_pid()  local
250 	pid = kmem_cache_alloc(ns->pid_cachep, GFP_KERNEL);  in alloc_pid()
251 	if (!pid)  in alloc_pid()
260 		pid->numbers[i].nr = nr;  in alloc_pid()
261 		pid->numbers[i].ns = tmp;  in alloc_pid()
266 	pid->level = ns->level;  in alloc_pid()
267 	atomic_set(&pid->count, 1);  in alloc_pid()
269 		INIT_HLIST_HEAD(&pid->tasks[type]);  in alloc_pid()
273 		upid = &pid->numbers[i];  in alloc_pid()
280 	return pid;  in alloc_pid()
284 		free_pidmap(pid->numbers + i);  in alloc_pid()
286 	kmem_cache_free(ns->pid_cachep, pid);  in alloc_pid()
287 	pid = NULL;  in alloc_pid()
291 struct pid *find_pid_ns(int nr, struct pid_namespace *ns)  in find_pid_ns()
299 			return container_of(pnr, struct pid,  in find_pid_ns()
306 struct pid *find_vpid(int nr)  in find_vpid()
316 		struct pid *pid)  in attach_pid()  argument
321 	link->pid = pid;  in attach_pid()
322 	hlist_add_head_rcu(&link->node, &pid->tasks[type]);  in attach_pid()
326 			struct pid *new)  in __change_pid()
329 	struct pid *pid;  in __change_pid()  local
333 	pid = link->pid;  in __change_pid()
336 	link->pid = new;  in __change_pid()
339 		if (!hlist_empty(&pid->tasks[tmp]))  in __change_pid()
342 	free_pid(pid);  in __change_pid()
351 		struct pid *pid)  in change_pid()  argument
353 	__change_pid(task, type, pid);  in change_pid()
354 	attach_pid(task, type, pid);  in change_pid()
361 	new->pids[type].pid = old->pids[type].pid;  in transfer_pid()
365 struct task_struct *pid_task(struct pid *pid, enum pid_type type)  in pid_task()  argument
368 	if (pid) {  in pid_task()
370 		first = rcu_dereference(pid->tasks[type].first);  in pid_task()
402 struct pid *get_task_pid(struct task_struct *task, enum pid_type type)  in get_task_pid()
404 	struct pid *pid;  in get_task_pid()  local
406 	pid = get_pid(task->pids[type].pid);  in get_task_pid()
408 	return pid;  in get_task_pid()
411 struct task_struct *get_pid_task(struct pid *pid, enum pid_type type)  in get_pid_task()  argument
415 	result = pid_task(pid, type);  in get_pid_task()
422 struct pid *find_get_pid(pid_t nr)  in find_get_pid()
424 	struct pid *pid;  in find_get_pid()  local
427 	pid = get_pid(find_vpid(nr));  in find_get_pid()
430 	return pid;  in find_get_pid()
434 pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns)  in pid_nr_ns()  argument
439 	if (pid && ns->level <= pid->level) {  in pid_nr_ns()
440 		upid = &pid->numbers[ns->level];  in pid_nr_ns()
447 pid_t pid_vnr(struct pid *pid)  in pid_vnr()  argument
449 	return pid_nr_ns(pid, current->nsproxy->pid_ns);  in pid_vnr()
488 struct pid *find_ge_pid(int nr, struct pid_namespace *ns)  in find_ge_pid()
490 	struct pid *pid;  in find_ge_pid()  local
493 		pid = find_pid_ns(nr, ns);  in find_ge_pid()
494 		if (pid)  in find_ge_pid()
499 	return pid;  in find_ge_pid()
534 	init_pid_ns.pid_cachep = KMEM_CACHE(pid,  in pidmap_init()