321 static struct pid **task_pid_ptr(struct task_struct *task, enum pid_type type)  in task_pid_ptr()  argument
324 		&task->thread_pid :  in task_pid_ptr()
325 		&task->signal->pids[type];  in task_pid_ptr()
331 void attach_pid(struct task_struct *task, enum pid_type type)  in attach_pid()  argument
333 	struct pid *pid = *task_pid_ptr(task, type);  in attach_pid()
334 	hlist_add_head_rcu(&task->pid_links[type], &pid->tasks[type]);  in attach_pid()
337 static void __change_pid(struct task_struct *task, enum pid_type type,  in __change_pid()  argument
340 	struct pid **pid_ptr = task_pid_ptr(task, type);  in __change_pid()
346 	hlist_del_rcu(&task->pid_links[type]);  in __change_pid()
356 void detach_pid(struct task_struct *task, enum pid_type type)  in detach_pid()  argument
358 	__change_pid(task, type, NULL);  in detach_pid()
361 void change_pid(struct task_struct *task, enum pid_type type,  in change_pid()  argument
364 	__change_pid(task, type, pid);  in change_pid()
365 	attach_pid(task, type);  in change_pid()
428 	struct task_struct *task;  in find_get_task_by_vpid()  local
431 	task = find_task_by_vpid(nr);  in find_get_task_by_vpid()
432 	if (task)  in find_get_task_by_vpid()
433 		get_task_struct(task);  in find_get_task_by_vpid()
436 	return task;  in find_get_task_by_vpid()
439 struct pid *get_task_pid(struct task_struct *task, enum pid_type type)  in get_task_pid()  argument
443 	pid = get_pid(rcu_dereference(*task_pid_ptr(task, type)));  in get_task_pid()
493 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,  in __task_pid_nr_ns()  argument
501 	nr = pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);  in __task_pid_nr_ns()
565 	struct task_struct *task;  in pidfd_get_task()  local
571 	task = get_pid_task(pid, PIDTYPE_TGID);  in pidfd_get_task()
573 	if (!task)  in pidfd_get_task()
577 	return task;  in pidfd_get_task()
669 static struct file *__pidfd_fget(struct task_struct *task, int fd)  in __pidfd_fget()  argument
674 	ret = down_read_killable(&task->signal->exec_update_lock);  in __pidfd_fget()
678 	if (ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS))  in __pidfd_fget()
679 		file = fget_task(task, fd);  in __pidfd_fget()
683 	up_read(&task->signal->exec_update_lock);  in __pidfd_fget()
690 	struct task_struct *task;  in pidfd_getfd()  local
694 	task = get_pid_task(pid, PIDTYPE_PID);  in pidfd_getfd()
695 	if (!task)  in pidfd_getfd()
698 	file = __pidfd_fget(task, fd);  in pidfd_getfd()
699 	put_task_struct(task);  in pidfd_getfd()