Fix get block id bug
Fix get block id bug

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