In most cases, there is single element for iov array, so using rbd_aio_read/write is enough. Signed-off-by: Ziye Yang <ziye.yang@intel.com> Change-Id: Id3ccbb4a4ff10be9d4546c8e89e6dc596d0f3a72 Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4122 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Broadcom CI Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>