79 int Fadvise(int fd, off_t offset, size_t len, int advice) {  in Fadvise()  argument
81   return posix_fadvise(fd, offset, len, advice);  in Fadvise()
84   (void)offset;  in Fadvise()
120 bool PosixPositionedWrite(int fd, const char* buf, size_t nbyte, off_t offset) {  in PosixPositionedWrite()  argument
129     ssize_t done = pwrite(fd, src, bytes_to_write, offset);  in PosixPositionedWrite()
137     offset += done;  in PosixPositionedWrite()
255 IOStatus PosixSequentialFile::PositionedRead(uint64_t offset, size_t n,  in PositionedRead()  argument
260   assert(IsSectorAligned(offset, GetRequiredBufferAlignment()));  in PositionedRead()
269     r = pread(fd_, ptr, left, static_cast<off_t>(offset));  in PositionedRead()
277     offset += r;  in PositionedRead()
288         "While pread " + ToString(n) + " bytes from offset " + ToString(offset),  in PositionedRead()
303 IOStatus PosixSequentialFile::InvalidateCache(size_t offset, size_t length) {  in InvalidateCache()  argument
305   (void)offset;  in InvalidateCache()
311     int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);  in InvalidateCache()
313       return IOError("While fadvise NotNeeded offset " + ToString(offset) +  in InvalidateCache()
566 IOStatus PosixRandomAccessFile::Read(uint64_t offset, size_t n,  in Read()  argument
571     assert(IsSectorAligned(offset, GetRequiredBufferAlignment()));  in Read()
580     r = pread(fd_, ptr, left, static_cast<off_t>(offset));  in Read()
588     offset += r;  in Read()
600         "While pread offset " + ToString(offset) + " len " + ToString(n),  in Read()
668           rep_to_submit->req->offset + rep_to_submit->finished_len);  in MultiRead()
708               Read(req->offset + req_wrap->finished_len,  in MultiRead()
733 IOStatus PosixRandomAccessFile::Prefetch(uint64_t offset, size_t n,  in Prefetch()  argument
740     r = readahead(fd_, offset, n);  in Prefetch()
744     advice.ra_offset = static_cast<off_t>(offset);  in Prefetch()
749       s = IOError("While prefetching offset " + ToString(offset) + " len " +  in Prefetch()
789 IOStatus PosixRandomAccessFile::InvalidateCache(size_t offset, size_t length) {  in InvalidateCache()  argument
794   (void)offset;  in InvalidateCache()
799   int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);  in InvalidateCache()
803   return IOError("While fadvise NotNeeded offset " + ToString(offset) +  in InvalidateCache()
837 IOStatus PosixMmapReadableFile::Read(uint64_t offset, size_t n,  in Read()  argument
842   if (offset > length_) {  in Read()
844     return IOError("While mmap read offset " + ToString(offset) +  in Read()
847   } else if (offset + n > length_) {  in Read()
848     n = static_cast<size_t>(length_ - offset);  in Read()
850   *result = Slice(reinterpret_cast<char*>(mmapped_region_) + offset, n);  in Read()
854 IOStatus PosixMmapReadableFile::InvalidateCache(size_t offset, size_t length) {  in InvalidateCache()  argument
856   (void)offset;  in InvalidateCache()
861   int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);  in InvalidateCache()
865   return IOError("While fadvise not needed. Offset " + ToString(offset) +  in InvalidateCache()
1074 IOStatus PosixMmapFile::InvalidateCache(size_t offset, size_t length) {  in InvalidateCache()  argument
1076   (void)offset;  in InvalidateCache()
1081   int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);  in InvalidateCache()
1090 IOStatus PosixMmapFile::Allocate(uint64_t offset, uint64_t len,  in Allocate()  argument
1093   assert(offset <= static_cast<uint64_t>(std::numeric_limits<off_t>::max()));  in Allocate()
1100                   static_cast<off_t>(offset), static_cast<off_t>(len));  in Allocate()
1106         "While fallocate offset " + ToString(offset) + " len " + ToString(len),  in Allocate()
1159 IOStatus PosixWritableFile::PositionedAppend(const Slice& data, uint64_t offset,  in PositionedAppend()  argument
1163     assert(IsSectorAligned(offset, GetRequiredBufferAlignment()));  in PositionedAppend()
1167   assert(offset <= static_cast<uint64_t>(std::numeric_limits<off_t>::max()));  in PositionedAppend()
1170   if (!PosixPositionedWrite(fd_, src, nbytes, static_cast<off_t>(offset))) {  in PositionedAppend()
1171     return IOError("While pwrite to file at offset " + ToString(offset),  in PositionedAppend()
1174   filesize_ = offset + nbytes;  in PositionedAppend()
1293 IOStatus PosixWritableFile::InvalidateCache(size_t offset, size_t length) {  in InvalidateCache()  argument
1298   (void)offset;  in InvalidateCache()
1303   int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);  in InvalidateCache()
1312 IOStatus PosixWritableFile::Allocate(uint64_t offset, uint64_t len,  in Allocate()  argument
1315   assert(offset <= static_cast<uint64_t>(std::numeric_limits<off_t>::max()));  in Allocate()
1323                   static_cast<off_t>(offset), static_cast<off_t>(len));  in Allocate()
1329         "While fallocate offset " + ToString(offset) + " len " + ToString(len),  in Allocate()
1335 IOStatus PosixWritableFile::RangeSync(uint64_t offset, uint64_t nbytes,  in RangeSync()  argument
1339   assert(offset <= static_cast<uint64_t>(std::numeric_limits<off_t>::max()));  in RangeSync()
1348           sync_file_range(fd_, 0, static_cast<off_t>(offset + nbytes),  in RangeSync()
1351       ret = sync_file_range(fd_, static_cast<off_t>(offset),  in RangeSync()
1361   return FSWritableFile::RangeSync(offset, nbytes, opts, dbg);  in RangeSync()
1384 IOStatus PosixRandomRWFile::Write(uint64_t offset, const Slice& data,  in Write()  argument
1389   if (!PosixPositionedWrite(fd_, src, nbytes, static_cast<off_t>(offset))) {  in Write()
1391         "While write random read/write file at offset " + ToString(offset),  in Write()
1398 IOStatus PosixRandomRWFile::Read(uint64_t offset, size_t n,  in Read()  argument
1404     ssize_t done = pread(fd_, ptr, left, offset);  in Read()
1412                          ToString(offset) + " len " + ToString(n),  in Read()
1421     offset += done;  in Read()