rbd: add img_obj_request_simple() helper

	return ret;

}

static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)

static bool img_obj_request_simple(struct rbd_obj_request *obj_request)

{

	struct rbd_img_request *img_request;

	struct rbd_device *rbd_dev;

	bool known;

	rbd_assert(obj_request_img_data_test(obj_request));

	rbd_assert(img_request);

	rbd_dev = img_request->rbd_dev;

	/* Reads */

	if (!img_request_write_test(img_request))

		return true;

	/* Non-layered writes */

	if (!img_request_layered_test(img_request))

		return true;

	/*

	 * Only writes to layered images need special handling.

	 * Reads and non-layered writes are simple object requests.

	 * Layered writes that start beyond the end of the overlap

	 * with the parent have no parent data, so they too are

	 * simple object requests.  Finally, if the target object is

	 * known to already exist, its parent data has already been

	 * copied, so a write to the object can also be handled as a

	 * simple object request.

	 * Layered writes outside of the parent overlap range don't

	 * share any data with the parent.

	 */

	if (!img_request_write_test(img_request) ||

		!img_request_layered_test(img_request) ||

		!obj_request_overlaps_parent(obj_request) ||

		((known = obj_request_known_test(obj_request)) &&

			obj_request_exists_test(obj_request))) {

	if (!obj_request_overlaps_parent(obj_request))

		return true;

	/*

	 * If the object is known to already exist, its parent data has

	 * already been copied.

	 */

	if (obj_request_known_test(obj_request) &&

	    obj_request_exists_test(obj_request))

		return true;

	return false;

}

static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)

{

	if (img_obj_request_simple(obj_request)) {

		struct rbd_device *rbd_dev;

		struct ceph_osd_client *osdc;

	 * start by reading the data for the full target object from

	 * the parent so we can use it for a copyup to the target.

	 */

	if (known)

	if (obj_request_known_test(obj_request))

		return rbd_img_obj_parent_read_full(obj_request);

	/* We don't know whether the target exists.  Go find out. */