code: function update_db(p, stats, _cb) {
          var key = sprintf(FILES_KEY_FMT, p);
          var k1 = sprintf(FHANDLE_KEY_FMT, p);
          var k2 = sprintf(FNAME_KEY_FMT, stats._fhandle);
  
          self.db.batch()
              .put(key, stats)
              .put(k1, stats._fhandle)
              .put(k2, p)
              .write(function onBatchWrite(err2) {
                  if (err2) {
                      log.error(err2, 'update_db(%s): failed', p);
                      _cb(errno(err2));
                  } else {
                      log.trace('update_db(%s): done', p);
                      self.cache.set(key, stats);
                      _cb(null);
                  }
              });
      }
docs: We can't use self.put here since we need to force the use of the old _fhandle and _cachefile; update the db directly.