class INodeFile extends INode {

  public long getPreferredBlockSize() {
    return header & ~HEADERMASK;
  }

    INodeFile(PermissionStatus permissions, int nrBlocks, short replication, long modificationTime, long atime,
      long preferredBlockSize);
  protected  INodeFile();
  protected  INodeFile(PermissionStatus permissions, BlockInfo[] blklist, short replication, long modificationTime,
      long atime, long preferredBlockSize);

}