rbd: allow "fancy" striping

	} __attribute__ ((packed)) striping_info_buf = { 0 };

	size_t size = sizeof (striping_info_buf);

	void *p;

	u64 obj_size;

	u64 stripe_unit;

	u64 stripe_count;

	int ret;

	ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,

	if (ret < size)

		return -ERANGE;

	/*

	 * We don't actually support the "fancy striping" feature

	 * (STRIPINGV2) yet, but if the striping sizes are the

	 * defaults the behavior is the same as before.  So find

	 * out, and only fail if the image has non-default values.

	 */

	ret = -EINVAL;

	obj_size = rbd_obj_bytes(&rbd_dev->header);

	p = &striping_info_buf;

	stripe_unit = ceph_decode_64(&p);

	if (stripe_unit != obj_size) {

		rbd_warn(rbd_dev, "unsupported stripe unit "

				"(got %llu want %llu)",

				stripe_unit, obj_size);

		return -EINVAL;

	}

	stripe_count = ceph_decode_64(&p);

	if (stripe_count != 1) {

		rbd_warn(rbd_dev, "unsupported stripe count "

				"(got %llu want 1)", stripe_count);

		return -EINVAL;

	}

	rbd_dev->header.stripe_unit = stripe_unit;

	rbd_dev->header.stripe_count = stripe_count;

	rbd_dev->header.stripe_unit = ceph_decode_64(&p);

	rbd_dev->header.stripe_count = ceph_decode_64(&p);

	return 0;

}