Fix OpenFile bug
Fix OpenFile bug

yvxiang/dfs,yvxiang/coverage_for_bfs,00k/ToyDFS,bluebore/bfs,lylei/dfs,myawan/bfs-1,baidu/bfs,yvxiang/dfs,yvxiang/dfs,imotai/bfs,bluebore/dfs,myawan/bfs-1,linyvxiang/dfs,linyvxiang/dfs,00k/ToyDFS,yvxiang/coverage_for_bfs,yvxiang/dfs,lylei/dfs,imotai/bfs,lylei/dfs,bluebore/bfs,linyvxiang/dfs,yvxiang/coverage_for_bfs,myawan/bfs-1,yvxiang/coverage_for_bfs,baidu/bfs,myawan/bfs-1,bluebore/bfs,bluebore/dfs,bluebore/dfs,lylei/dfs,baidu/bfs,baidu/bfs,imotai/bfs