rbd_obj_img_extents_bytes
u32 obj_overlap = rbd_obj_img_extents_bytes(obj_req);
ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req));
u32 bytes = rbd_obj_img_extents_bytes(obj_req);
rbd_obj_img_extents_bytes(obj_req))) {