drbd: Add drbd_recv_all(): Receive an entire buffer

	return rv;

}

static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size)

{

	int err;

	err = drbd_recv(tconn, buf, size);

	if (err != size) {

		if (err >= 0)

			err = -EIO;

	} else

		err = 0;

	return err;

}

/* quoting tcp(7):

 *   On individual connections, the socket buffer size must be set prior to the

 *   listen(2) or connect(2) calls in order to have it take effect.