484   for (const auto& [begin, end] : src) {  in ReadBlocks()
485     if (!check_lseek(fd, static_cast<off64_t>(begin) * BLOCKSIZE, SEEK_SET)) {  in ReadBlocks()
489     size_t size = (end - begin) * BLOCKSIZE;  in ReadBlocks()
504   for (const auto& [begin, end] : tgt) {  in WriteBlocks()
505     off64_t offset = static_cast<off64_t>(begin) * BLOCKSIZE;  in WriteBlocks()
506     size_t size = (end - begin) * BLOCKSIZE;  in WriteBlocks()
1290     for (const auto& [begin, end] : tgt) {  in PerformCommandZero()
1291       off64_t offset = static_cast<off64_t>(begin) * BLOCKSIZE;  in PerformCommandZero()
1292       size_t size = (end - begin) * BLOCKSIZE;  in PerformCommandZero()
1301       for (size_t j = begin; j < end; ++j) {  in PerformCommandZero()
1468     for (const auto& [begin, end] : tgt) {  in PerformCommandErase()
1469       off64_t offset = static_cast<off64_t>(begin) * BLOCKSIZE;  in PerformCommandErase()
1470       size_t size = (end - begin) * BLOCKSIZE;  in PerformCommandErase()
1541   for (const auto& [begin, end] : source_ranges) {  in PerformCommandComputeHashTree()
1543     if (!check_lseek(params.fd, static_cast<off64_t>(begin) * BLOCKSIZE, SEEK_SET)) {  in PerformCommandComputeHashTree()
1544       PLOG(ERROR) << "Failed to seek to block: " << begin;  in PerformCommandComputeHashTree()
1548     for (size_t i = begin; i < end; i++) {  in PerformCommandComputeHashTree()
1551         LOG(ERROR) << "Failed to read data in " << begin << ":" << end;  in PerformCommandComputeHashTree()
2113   for (const auto& [begin, end] : rs) {  in RangeSha1Fn()
2114     if (!check_lseek(fd, static_cast<off64_t>(begin) * BLOCKSIZE, SEEK_SET)) {  in RangeSha1Fn()
2120     for (size_t j = begin; j < end; ++j) {  in RangeSha1Fn()
2268   for (const auto& [begin, end] : rs) {  in BlockImageRecoverFn()
2269     for (size_t j = begin; j < end; ++j) {  in BlockImageRecoverFn()