Method filename

be/src/runtime/io/data-cache.cc:437–439

  }

  Slice filename() const {
    return Slice(key_.data() + OFFSETOF_FILENAME, key_.size() - OFFSETOF_FILENAME);
  }

  int64_t mtime() const {
    return UNALIGNED_LOAD64(key_.data() + OFFSETOF_MTIME);