logical_to_bytes
good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
logical_to_bytes(sdp, sdkp->min_xfer_blocks);
logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
logical_to_bytes(sdp, sdkp->min_xfer_blocks);
lim->io_min = logical_to_bytes(sdp, sdkp->min_xfer_blocks);
logical_to_bytes(sdp, sdkp->opt_xfer_blocks));