620   IOStatus Read(size_t n, const IOOptions& /*options*/, Slice* result,  in Read()
635                           const IOOptions& /*options*/, Slice* result,  in PositionedRead()
652   IOStatus Read(uint64_t offset, size_t n, const IOOptions& /*options*/,  in Read()
658                      const IOOptions& /*options*/,  in MultiRead()
682   IOStatus Prefetch(uint64_t offset, size_t n, const IOOptions& /*options*/,  in Prefetch()
709   IOStatus Append(const Slice& data, const IOOptions& /*options*/,  in Append()
714                             const IOOptions& /*options*/,  in PositionedAppend()
718   IOStatus Truncate(uint64_t size, const IOOptions& /*options*/,  in Truncate()
722   IOStatus Close(const IOOptions& /*options*/,  in Close()
726   IOStatus Flush(const IOOptions& /*options*/,  in Flush()
730   IOStatus Sync(const IOOptions& /*options*/,  in Sync()
734   IOStatus Fsync(const IOOptions& /*options*/,  in Fsync()
754   uint64_t GetFileSize(const IOOptions& /*options*/,  in GetFileSize()
777                      const IOOptions& /*options*/,  in RangeSync()
782   void PrepareWrite(size_t offset, size_t len, const IOOptions& /*options*/,  in PrepareWrite()
787   IOStatus Allocate(uint64_t offset, uint64_t len, const IOOptions& /*options*/,  in Allocate()
808                  const IOOptions& /*options*/,  in Write()
812   IOStatus Read(uint64_t offset, size_t n, const IOOptions& /*options*/,  in Read()
817   IOStatus Flush(const IOOptions& /*options*/,  in Flush()
821   IOStatus Sync(const IOOptions& /*options*/,  in Sync()
825   IOStatus Fsync(const IOOptions& /*options*/,  in Fsync()
829   IOStatus Close(const IOOptions& /*options*/,  in Close()
843   IOStatus Fsync(const IOOptions& /*options*/,  in Fsync()
939   IOStatus NewDirectory(const std::string& name, const IOOptions& /*io_opts*/,  in NewDirectory()
949   IOStatus FileExists(const std::string& f, const IOOptions& /*io_opts*/,  in FileExists()
953   IOStatus GetChildren(const std::string& dir, const IOOptions& /*io_opts*/,  in GetChildren()
959                                      const IOOptions& /*options*/,  in GetChildrenFileAttributes()
964   IOStatus DeleteFile(const std::string& f, const IOOptions& /*options*/,  in DeleteFile()
969                     const IOOptions& /*options*/,  in Truncate()
973   IOStatus CreateDir(const std::string& d, const IOOptions& /*options*/,  in CreateDir()
978                               const IOOptions& /*options*/,  in CreateDirIfMissing()
982   IOStatus DeleteDir(const std::string& d, const IOOptions& /*options*/,  in DeleteDir()
986   IOStatus GetFileSize(const std::string& f, const IOOptions& /*options*/,  in GetFileSize()
992                                    const IOOptions& /*options*/,  in GetFileModificationTime()
1000                            const IOOptions& /*options*/,  in GetAbsolutePath()
1007                       const IOOptions& /*options*/,  in RenameFile()
1013                     const IOOptions& /*options*/,  in LinkFile()
1018   IOStatus NumFileLinks(const std::string& fname, const IOOptions& /*options*/,  in NumFileLinks()
1024                         const IOOptions& /*options*/, bool* res,  in AreFilesSame()
1029   IOStatus LockFile(const std::string& f, const IOOptions& /*options*/,  in LockFile()
1034   IOStatus UnlockFile(FileLock* l, const IOOptions& /*options*/,  in UnlockFile()
1039   IOStatus GetTestDirectory(const IOOptions& /*options*/, std::string* path,  in GetTestDirectory()
1043   IOStatus NewLogger(const std::string& fname, const IOOptions& /*options*/,  in NewLogger()
1080   IOStatus GetFreeSpace(const std::string& path, const IOOptions& /*options*/,  in GetFreeSpace()