public static @NotNull MappedFileStorageHelper openHelper(@NotNull FSRecordsImpl vfs,
                                                            @NotNull String storageName,
                                                            int bytesPerRow) throws IOException {
    return openHelper(vfs, storageName, bytesPerRow, true);
  }
public static @NotNull MappedFileStorageHelper openHelper(@NotNull FSRecordsImpl vfs,
                                                            @NotNull String storageName,
                                                            int bytesPerRow)