code: private void unprotectedUpdateCount(INode[] inodes, int numOfINodes,
                                        long nsDelta, long dsDelta) {
      for(int i=0; i < numOfINodes; i++) {
        if (inodes[i].isQuotaSet()) { // a directory with quota
          INodeDirectoryWithQuota node =(INodeDirectoryWithQuota)inodes[i];
          node.updateNumItemsInTree(nsDelta, dsDelta);
        }
      }
    }
docs: updates quota without verification
  callers responsibility is to make sure quota is not exceeded
  @param inodes
  @param numOfINodes
  @param nsDelta
  @param dsDelta