def add_dir_entry(backup_run, dir_entry_path, process_bar, result):
    """
    :param backup_run:
    :param dir_entry_path: filesystem_walk.DirEntryPath() instance
    :param process_bar:
    """
    # print(dir_entry_path.pformat())
    # print(dir_entry_path.stat.st_nlink)

    backup_entry = Path2(dir_entry_path.path)
    filesize = dir_entry_path.stat.st_size
    hash_filepath = Path2("%s%s%s" % (backup_entry.path, os.extsep, phlb_config.hash_name))
    if hash_filepath.is_file():
        with hash_filepath.open("r") as hash_file:
            hash_hexdigest = hash_file.read().strip()
        if filesize > 0:
            process_bar.update(filesize)
    else:
        with hash_filepath.open("w") as hash_file:
            callback = HashCallback(process_bar)
            with backup_entry.open("rb") as f:
                hash = calculate_hash(f, callback)

            hash_hexdigest = hash.hexdigest()
            hash_file.write(hash_hexdigest)

    old_backup_entry = deduplicate(backup_entry, hash_hexdigest)
    if old_backup_entry is None:
        result.add_new_file(filesize)
    else:
        result.add_stined_file(filesize)

    BackupEntry.objects.create(
        backup_run, dir_entry_path.path_instance, hash_hexdigest=hash_hexdigest  # Path2() instance
    )
:param backup_run:
    :param dir_entry_path: filesystem_walk.DirEntryPath() instance
    :param process_bar: