184   virtual Status NewSequentialFile(const std::string& fname,
195   virtual Status NewRandomAccessFile(const std::string& fname,
216   virtual Status NewWritableFile(const std::string& fname,
234   virtual Status ReuseWritableFile(const std::string& fname,
275   virtual Status FileExists(const std::string& fname) = 0;
301   virtual Status DeleteFile(const std::string& fname) = 0;
319   virtual Status GetFileSize(const std::string& fname, uint64_t* file_size) = 0;
322   virtual Status GetFileModificationTime(const std::string& fname,
359   virtual Status LockFile(const std::string& fname, FileLock** lock) = 0;
425   virtual Status NewLogger(const std::string& fname,
1132                                 const std::string& fname,
1136 extern Status ReadFileToString(Env* env, const std::string& fname,
1199   Status ReopenWritableFile(const std::string& fname,  in ReopenWritableFile()  argument
1202     return target_->ReopenWritableFile(fname, result, options);  in ReopenWritableFile()
1204   Status ReuseWritableFile(const std::string& fname,  in ReuseWritableFile()  argument
1208     return target_->ReuseWritableFile(fname, old_fname, r, options);  in ReuseWritableFile()
1210   Status NewRandomRWFile(const std::string& fname,  in NewRandomRWFile()  argument
1213     return target_->NewRandomRWFile(fname, result, options);  in NewRandomRWFile()
1216       const std::string& fname,  in NewMemoryMappedFileBuffer()  argument
1218     return target_->NewMemoryMappedFileBuffer(fname, result);  in NewMemoryMappedFileBuffer()
1238   Status Truncate(const std::string& fname, size_t size) override {  in Truncate()  argument
1239     return target_->Truncate(fname, size);  in Truncate()
1254   Status GetFileModificationTime(const std::string& fname,  in GetFileModificationTime()  argument
1256     return target_->GetFileModificationTime(fname, file_mtime);  in GetFileModificationTime()
1267   Status NumFileLinks(const std::string& fname, uint64_t* count) override {  in NumFileLinks()  argument
1268     return target_->NumFileLinks(fname, count);  in NumFileLinks()
1307   Status NewLogger(const std::string& fname,  in NewLogger()  argument
1309     return target_->NewLogger(fname, result);  in NewLogger()
1613 Status NewEnvLogger(const std::string& fname, Env* env,