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compute_remaining_iovec() is a re-usable routine for retrying after pg_readv() or pg_writev() reports a short transfer. This will gain new users in a later commit, but can already replace the open-coded equivalent code in the existing pg_pwritev_with_retry() function. Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://postgr.es/m/CA+hUKGJkOiOCa+mag4BF+zHo7qo=o9CFheB8=g6uT5TUm2gkvA@mail.gmail.com