code: INodeFile getFileINode(String src) {
      byte[][] components = INodeDirectory.getPathComponents(src);
      readLock();
      try {
        INode inode = rootDir.getNode(components);
        if (inode == null || inode.isDirectory())
          return null;
        return (INodeFile)inode;
      } finally {
        readUnlock();
      }
    }
docs: Get {@link INode} associated with the file.