public static @NotNull MappedFileStorageHelper openHelper(@NotNull FSRecordsImpl vfs,
                                                            @NotNull String storageName,
                                                            int bytesPerRow,
                                                            boolean checkFileIdsBelowMax) throws IOException {
    PersistentFSConnection connection = vfs.connection();
    Path fastAttributesDir = connection.getPersistentFSPaths().storagesSubDir("extended-attributes");
    Path storagePath = fastAttributesDir.resolve(storageName).toAbsolutePath();
    return openHelper(vfs, storagePath, bytesPerRow, checkFileIdsBelowMax);
  }
public static @NotNull MappedFileStorageHelper openHelper(@NotNull FSRecordsImpl vfs,
                                                            @NotNull String storageName,
                                                            int bytesPerRow,
                                                            boolean checkFileIdsBelowMax)