8d73137ae8
Summary: In the current code base, we can use Directory from Env to manage directory (e.g, Fsync()). The PR https://github.com/facebook/rocksdb/issues/5761 introduce the File System as a new Env API. So we further replace the Directory class in DB with FSDirectory such that we can have more IO information from IOStatus returned by FSDirectory. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6468 Test Plan: pass make asan_check Differential Revision: D20195261 Pulled By: zhichao-cao fbshipit-source-id: 93962cb9436852bfcfb76e086d9e7babd461cbe1