if (FlagOn(DirentAttributes, FAT_DIRENT_ATTR_READ_ONLY)) {

            //
            //  Check the desired access for a read-only dirent, we blackball
            //  WRITE, FILE_APPEND_DATA, FILE_ADD_FILE,
            //  FILE_ADD_SUBDIRECTORY, and FILE_DELETE_CHILD
            //

            if (FlagOn(*DesiredAccess, ~(DELETE |
                                         READ_CONTROL |
                                         WRITE_OWNER |
                                         WRITE_DAC |
                                         SYNCHRONIZE |
                                         ACCESS_SYSTEM_SECURITY |
                                         FILE_READ_DATA |
                                         FILE_READ_EA |
                                         FILE_WRITE_EA |
                                         FILE_READ_ATTRIBUTES |
                                         FILE_WRITE_ATTRIBUTES |
                                         FILE_EXECUTE |
                                         FILE_LIST_DIRECTORY |
                                         FILE_TRAVERSE))) {

                DebugTrace(0, Dbg, "Cannot open readonly\n", 0);