attrExpiration = sizeExpiration =
                System.currentTimeMillis() + attrExpirationPeriod;
    }

    private SmbComBlankResponse blank_resp() {
        if( blank_resp == null ) {
            blank_resp = new SmbComBlankResponse();
        }
        return blank_resp;
    }
    void resolveDfs(ServerMessageBlock request) throws SmbException {
        if (request instanceof SmbComClose)
            return;