static void scsi_disk_emulate_mode_select(SCSIDiskReq *r, uint8_t *inbuf)
{
    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
    uint8_t *p = inbuf;
    int cmd = r->req.cmd.buf[0];
    int len = r->req.cmd.xfer;
    int hdr_len = (cmd == MODE_SELECT ? 4 : 8);
    int bd_len;
    int pass;

    /* We only support PF=1, SP=0.  */
    if ((r->req.cmd.buf[1] & 0x11) != 0x10) {
        goto invalid_field;
    }

    if (len < hdr_len) {
        goto invalid_param_len;
    }

    bd_len = (cmd == MODE_SELECT ? p[3] : lduw_be_p(&p[6]));
    len -= hdr_len;
    p += hdr_len;
    if (len < bd_len) {
        goto invalid_param_len;
    }
    if (bd_len != 0 && bd_len != 8) {
        goto invalid_param;
    }

    len -= bd_len;
    p += bd_len;

    /* Ensure no change is made if there is an error!  */
    for (pass = 0; pass < 2; pass++) {
        if (mode_select_pages(r, p, len, pass == 1) < 0) {
            assert(pass == 0);
            return;
        }
    }
    if (!blk_enable_write_cache(s->qdev.conf.blk)) {
        /* The request is used as the AIO opaque value, so add a ref.  */
        scsi_req_ref(&r->req);
        block_acct_start(blk_get_stats(s->qdev.conf.blk), &r->acct, 0,
                         BLOCK_ACCT_FLUSH);
        r->req.aiocb = blk_aio_flush(s->qdev.conf.blk, scsi_aio_complete, r);
        return;
    }

    scsi_req_complete(&r->req, GOOD);
    return;

invalid_param:
    scsi_check_condition(r, SENSE_CODE(INVALID_PARAM));
    return;

invalid_param_len:
    scsi_check_condition(r, SENSE_CODE(INVALID_PARAM_LEN));
    return;

invalid_field:
    scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));
}
Unknown