This ML thread's only real argument is that some OS/Kernels may not support pread/pwrite. The readahead argument makes little to no sense IMO. Unless there are

This ML thread's only real argument is that some OS/Kernels may not support pread/pwrite. The readahead argument makes little to no sense IMO. Unless there are too many uses of random access IO in the codebase, they should use pread and friends if available there. Especially considering most people run it on Linux not some exotic OS nowadays.