scsi_cdl_check_cmd
scsi_cdl_check_cmd(sdev, READ_16, 0, buf) ||
scsi_cdl_check_cmd(sdev, WRITE_16, 0, buf) ||
scsi_cdl_check_cmd(sdev, VARIABLE_LENGTH_CMD, READ_32, buf) ||
scsi_cdl_check_cmd(sdev, VARIABLE_LENGTH_CMD, WRITE_32, buf);