code: INode getINode(String src) {
      src = normalizePath(src);
      byte[][] components = INodeDirectory.getPathComponents(src);
      readLock();
      try {
        INode inode = rootDir.getNode(components);
        return inode;
      } finally {
        readUnlock();
      }
    }
docs: This is a method required in addition
  to getFileInode
  It returns the INode regardless of its type
  getFileInode only returns the inode if it is
  of a file type