void loadRootData(int fileId,
                    @NotNull String path,
                    @NotNull NewVirtualFileSystem fs) {
    try {
      treeAccessor.loadRootData(fileId, path, fs);
    }
    catch (IOException e) {
      throw handleError(e);
    }
  }
void loadRootData(int fileId,
                    @NotNull String path,
                    @NotNull NewVirtualFileSystem fs)