struct pid *pidfd_pid(const struct file *file)
{
	if (file->f_op == &pidfd_fops)
		return file->private_data;

	return ERR_PTR(-EBADF);
}
struct pid *pidfd_pid(const struct file *file)
{
	if (file->f_op == &pidfd_fops)
		return file->private_data;

	return ERR_PTR(-EBADF);
}