Linux internally truncates any read and write at a limit of 'MAX_RW_COUNT', which is slightly less than 2 GiB, for a few reasons. We will work around it by reading or writing some segments at a time, re-issuing another read/write operation whenever one completes until completed, EOF if reading, or an error occurs. Note that this MAX_RW_COUNT also applies to readv and writev, which means we would need a similar mechanism there to handle this. This is to be done in a follow-up. Task-number: QTBUG-136763 Change-Id: I9bcb75587ae5e84cb80ea3950a569f60c4906617 Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>