ai = queryFSInformation(th, AllocInfo.class, FileSystemInformation.SMB_INFO_ALLOCATION);
                    break;
                }
            default:
                throw ex;
            }
        }
        return ai;
    }

    private <T extends FileSystemInformation> T queryFSInformation(final SmbTreeHandleImpl th, final Class<T> clazz, final byte level)