25 Status SequentialFileReader::Read(size_t n, Slice* result, char* scratch) {  in Read()
29     size_t offset = offset_.fetch_add(n);  in Read()
30     size_t alignment = file_->GetRequiredBufferAlignment();  in Read()
31     size_t aligned_offset = TruncateToPageBoundary(alignment, offset);  in Read()
32     size_t offset_advance = offset - aligned_offset;  in Read()
33     size_t size = Roundup(offset + n, alignment) - aligned_offset;  in Read()
34     size_t r = 0;  in Read()
58     offset_ += static_cast<size_t>(n);  in Skip()
73                           size_t readahead_size)  in ReadaheadSequentialFile()
88   IOStatus Read(size_t n, const IOOptions& opts, Slice* result, char* scratch,  in Read()
92     size_t cached_len = 0;  in Read()
120       size_t remaining_len;  in Read()
154   IOStatus PositionedRead(uint64_t offset, size_t n, const IOOptions& opts,  in PositionedRead()
160   IOStatus InvalidateCache(size_t offset, size_t length) override {  in InvalidateCache()
173   bool TryReadFromCache(size_t n, size_t* cached_len, char* scratch) {  in TryReadFromCache()
181         buffer_.CurrentSize() - static_cast<size_t>(offset_in_buffer), n);  in TryReadFromCache()
190   IOStatus ReadIntoBuffer(size_t n, const IOOptions& opts,  in ReadIntoBuffer()
207   const size_t alignment_;
208   const size_t readahead_size_;
227     std::unique_ptr<FSSequentialFile>&& file, size_t readahead_size) {  in NewReadaheadSequentialFile()