Fix bfs_mount
Fix bfs_mount

lylei/dfs,baidu/bfs,baidu/bfs,baidu/bfs,yvxiang/dfs,baidu/bfs,yvxiang/coverage_for_bfs,bluebore/bfs,linyvxiang/dfs,lylei/dfs,bluebore/dfs,linyvxiang/dfs,lylei/dfs,yvxiang/dfs,yvxiang/coverage_for_bfs,bluebore/dfs,lylei/dfs,yvxiang/coverage_for_bfs,yvxiang/coverage_for_bfs,bluebore/bfs,bluebore/bfs,linyvxiang/dfs,bluebore/dfs,yvxiang/dfs,yvxiang/dfs