IOP_REQUEST_TYPE_SCSI_COMMAND
req->header.type = cpu_to_le32(IOP_REQUEST_TYPE_SCSI_COMMAND);
case IOP_REQUEST_TYPE_SCSI_COMMAND:
case IOP_REQUEST_TYPE_SCSI_COMMAND:
BUG_ON(req->header.type != cpu_to_le32(IOP_REQUEST_TYPE_SCSI_COMMAND));
IOP_REQUEST_TYPE_SCSI_COMMAND<<5);