static int scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) { cmd->xfer = scsi_cdb_length(buf); switch (buf[0]) { case TEST_UNIT_READY: case REWIND: case START_STOP: case SET_CAPACITY: case WRITE_FILEMARKS: case WRITE_FILEMARKS_16: case SPACE: case RESERVE: case RELEASE: case ERASE: case ALLOW_MEDIUM_REMOVAL: case SEEK_10: case SYNCHRONIZE_CACHE: case SYNCHRONIZE_CACHE_16: case LOCATE_16: case LOCK_UNLOCK_CACHE: case SET_CD_SPEED: case SET_LIMITS: case WRITE_LONG_10: case UPDATE_BLOCK: case RESERVE_TRACK: case SET_READ_AHEAD: case PRE_FETCH: case PRE_FETCH_16: case ALLOW_OVERWRITE: cmd->xfer = 0; break; case VERIFY_10: case VERIFY_12: case VERIFY_16: if ((buf[1] & 2) == 0) { cmd->xfer = 0; } else if ((buf[1] & 4) == 1) { cmd->xfer = 1; } cmd->xfer *= dev->blocksize; break; case MODE_SENSE: break; case WRITE_SAME_10: case WRITE_SAME_16: cmd->xfer = dev->blocksize; break; case READ_CAPACITY_10: cmd->xfer = 8; break; case READ_BLOCK_LIMITS: cmd->xfer = 6; break; case SEND_VOLUME_TAG: /* GPCMD_SET_STREAMING from multimedia commands. */ if (dev->type == TYPE_ROM) { cmd->xfer = buf[10] | (buf[9] << 8); } else { cmd->xfer = buf[9] | (buf[8] << 8); } break; case WRITE_6: /* length 0 means 256 blocks */ if (cmd->xfer == 0) { cmd->xfer = 256; } case WRITE_10: case WRITE_VERIFY_10: case WRITE_12: case WRITE_VERIFY_12: case WRITE_16: case WRITE_VERIFY_16: cmd->xfer *= dev->blocksize; break; case READ_6: case READ_REVERSE: /* length 0 means 256 blocks */ if (cmd->xfer == 0) { cmd->xfer = 256; } case READ_10: case RECOVER_BUFFERED_DATA: case READ_12: case READ_16: cmd->xfer *= dev->blocksize; break; case FORMAT_UNIT: /* MMC mandates the parameter list to be 12-bytes long. Parameters * for block devices are restricted to the header right now. */ if (dev->type == TYPE_ROM && (buf[1] & 16)) { cmd->xfer = 12; } else { cmd->xfer = (buf[1] & 16) == 0 ? 0 : (buf[1] & 32 ? 8 : 4); } break; case INQUIRY: case RECEIVE_DIAGNOSTIC: case SEND_DIAGNOSTIC: cmd->xfer = buf[4] | (buf[3] << 8); break; case READ_CD: case READ_BUFFER: case WRITE_BUFFER: case SEND_CUE_SHEET: cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16); break; case PERSISTENT_RESERVE_OUT: cmd->xfer = ldl_be_p(&buf[5]) & 0xffffffffULL; break; case ERASE_12: if (dev->type == TYPE_ROM) { /* MMC command GET PERFORMANCE. */ cmd->xfer = scsi_get_performance_length(buf[9] | (buf[8] << 8), buf[10], buf[1] & 0x1f); } break; case MECHANISM_STATUS: case READ_DVD_STRUCTURE: case SEND_DVD_STRUCTURE: case MAINTENANCE_OUT: case MAINTENANCE_IN: if (dev->type == TYPE_ROM) { /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */ cmd->xfer = buf[9] | (buf[8] << 8); } break; case ATA_PASSTHROUGH_12: if (dev->type == TYPE_ROM) { /* BLANK command of MMC */ cmd->xfer = 0; } else { cmd->xfer = ata_passthrough_12_xfer_size(dev, buf); } break; case ATA_PASSTHROUGH_16: cmd->xfer = ata_passthrough_16_xfer_size(dev, buf); break; } return 0; }