long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct pipe_inode_info *pipe;
	long ret;

	pipe = get_pipe_info(file, false);
	if (!pipe)
		return -EBADF;

	__pipe_lock(pipe);

	switch (cmd) {
	case F_SETPIPE_SZ:
		ret = pipe_set_size(pipe, arg);
		break;
	case F_GETPIPE_SZ:
		ret = pipe->max_usage * PAGE_SIZE;
		break;
	default:
		ret = -EINVAL;
		break;
	}

	__pipe_unlock(pipe);
	return ret;
}
Unknown