public String getQuery() {
            return request.getParameter("q");
        }

        @Override
        public String[] getExtraQueries() {
            return getParamValueArray(request, "ex_q");
        }

        @Override
        public Map<String, String[]> getFields() {
            final Map<String, String[]> fields = new HashMap<>();

        AllocInfo ai;
        try {
            ai = queryFSInformation(th, AllocInfo.class, FileSystemInformation.FS_SIZE_INFO);
        }
        catch ( SmbException ex ) {
            log.debug("getDiskFreeSpace", ex);
            switch ( ex.getNtStatus() ) {
            case NtStatus.NT_STATUS_INVALID_INFO_CLASS:
            case NtStatus.NT_STATUS_UNSUCCESSFUL: // NetApp Filer
                if ( !th.isSMB2() ) {