54   Status InvalidateCache(size_t offset, size_t length) override {  in InvalidateCache()  argument
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()  argument
70     Status as = a_->Read(offset, n, result, scratch);  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()
110   Status PositionedAppend(const Slice& data, uint64_t offset) override {  in PositionedAppend()  argument
111     Status as = a_->PositionedAppend(data, offset);  in PositionedAppend()
112     Status bs = b_->PositionedAppend(data, offset);  in PositionedAppend()
173   Status InvalidateCache(size_t offset, size_t length) override {  in InvalidateCache()  argument
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()  argument
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()  argument
188     Status as = a_->RangeSync(offset, nbytes);  in RangeSync()
189     Status bs = b_->RangeSync(offset, nbytes);  in RangeSync()