scsi_cmd_rw_decode
scsi_cmd_rw_decode(&xs->cmd, &lba, §or_count);
scsi_cmd_rw_decode(&xs->cmd, &lba, &blocks);
scsi_cmd_rw_decode(&xs->cmd, &lba, &blocks);
void scsi_cmd_rw_decode(struct scsi_generic *, u_int64_t *, u_int32_t *);