writeUtf8(entry.key)
          writeByte('\n'.code)
        } else {
          writeUtf8(CLEAN).writeByte(' '.code)
          writeUtf8(entry.key)
          entry.writeLengths(this)
          writeByte('\n'.code)
        }
      }
    }

    if (fileSystem.exists(journalFile)) {
      fileSystem.atomicMove(journalFile, journalFileBackup)