private AllocInfo fetchAllocationInfo(final SmbTreeHandleImpl th) throws CIFSException, SmbException {
        AllocInfo ai;
        try {
            ai = queryFSInformation(th, AllocInfo.class, FileSystemInformation.FS_SIZE_INFO);
        } catch (final SmbException ex) {
            log.debug("getDiskFreeSpace", ex);
            switch (ex.getNtStatus()) {
            case NtStatus.NT_STATUS_INVALID_INFO_CLASS: