24   Status Read(size_t n, Slice* result, char* scratch) override {  in Read()
26     Status as = a_->Read(n, &aslice, scratch);  in Read()
27     if (as == Status::OK()) {  in Read()
33         Status bs = b_->Read(left, &bslice, bscratch);  in Read()
42       Status bs = b_->Read(n, result, scratch);  in Read()
48   Status Skip(uint64_t n) override {  in Skip()
49     Status as = a_->Skip(n);  in Skip()
50     Status bs = b_->Skip(n);  in Skip()
54   Status InvalidateCache(size_t offset, size_t length) override {  in InvalidateCache()
55     Status as = a_->InvalidateCache(offset, length);  in InvalidateCache()
56     Status bs = b_->InvalidateCache(offset, length);  in InvalidateCache()
68   Status Read(uint64_t offset, size_t n, Slice* result,  in Read()
70     Status as = a_->Read(offset, n, result, scratch);  in Read()
71     if (as == Status::OK()) {  in Read()
77         Status bs = b_->Read(offset + off, left, &bslice, bscratch);  in Read()
85       Status bs = b_->Read(offset, n, result, scratch);  in Read()
104   Status Append(const Slice& data) override {  in Append()
105     Status as = a_->Append(data);  in Append()
106     Status bs = b_->Append(data);  in Append()
110   Status PositionedAppend(const Slice& data, uint64_t offset) override {  in PositionedAppend()
111     Status as = a_->PositionedAppend(data, offset);  in PositionedAppend()
112     Status bs = b_->PositionedAppend(data, offset);  in PositionedAppend()
116   Status Truncate(uint64_t size) override {  in Truncate()
117     Status as = a_->Truncate(size);  in Truncate()
118     Status bs = b_->Truncate(size);  in Truncate()
122   Status Close() override {  in Close()
123     Status as = a_->Close();  in Close()
124     Status bs = b_->Close();  in Close()
128   Status Flush() override {  in Flush()
129     Status as = a_->Flush();  in Flush()
130     Status bs = b_->Flush();  in Flush()
134   Status Sync() override {  in Sync()
135     Status as = a_->Sync();  in Sync()
136     Status bs = b_->Sync();  in Sync()
140   Status Fsync() override {  in Fsync()
141     Status as = a_->Fsync();  in Fsync()
142     Status bs = b_->Fsync();  in Fsync()
173   Status InvalidateCache(size_t offset, size_t length) override {  in InvalidateCache()
174     Status as = a_->InvalidateCache(offset, length);  in InvalidateCache()
175     Status bs = b_->InvalidateCache(offset, length);  in InvalidateCache()
181   Status Allocate(uint64_t offset, uint64_t length) override {  in Allocate()
182     Status as = a_->Allocate(offset, length);  in Allocate()
183     Status bs = b_->Allocate(offset, length);  in Allocate()
187   Status RangeSync(uint64_t offset, uint64_t nbytes) override {  in RangeSync()
188     Status as = a_->RangeSync(offset, nbytes);  in RangeSync()
189     Status bs = b_->RangeSync(offset, nbytes);  in RangeSync()
195 Status EnvMirror::NewSequentialFile(const std::string& f,  in NewSequentialFile()
202   Status as = a_->NewSequentialFile(f, &mf->a_, options);  in NewSequentialFile()
203   Status bs = b_->NewSequentialFile(f, &mf->b_, options);  in NewSequentialFile()
212 Status EnvMirror::NewRandomAccessFile(const std::string& f,  in NewRandomAccessFile()
219   Status as = a_->NewRandomAccessFile(f, &mf->a_, options);  in NewRandomAccessFile()
220   Status bs = b_->NewRandomAccessFile(f, &mf->b_, options);  in NewRandomAccessFile()
229 Status EnvMirror::NewWritableFile(const std::string& f,  in NewWritableFile()
234   Status as = a_->NewWritableFile(f, &mf->a_, options);  in NewWritableFile()
235   Status bs = b_->NewWritableFile(f, &mf->b_, options);  in NewWritableFile()
244 Status EnvMirror::ReuseWritableFile(const std::string& fname,  in ReuseWritableFile()
251   Status as = a_->ReuseWritableFile(fname, old_fname, &mf->a_, options);  in ReuseWritableFile()
252   Status bs = b_->ReuseWritableFile(fname, old_fname, &mf->b_, options);  in ReuseWritableFile()