auto gcs_file = static_cast<GCSFile*>(file->plugin_file);
  int64_t position = int64_t(gcs_file->outfile.tellp());
  if (position == -1)
    TF_SetStatus(status, TF_INTERNAL,
                 "tellp on the internal temporary file failed");
  else
    TF_SetStatus(status, TF_OK, "");
  return position == -1
             ? -1
             : position + (gcs_file->offset == -1 ? 0 : gcs_file->offset);
}