Re: refactoring relation extension and BufferAlloc(), faster COPY

Hi,

On 2023-03-30 12:28:57 +0700, John Naylor wrote:
> On Thu, Mar 30, 2023 at 10:02 AM Andres Freund <andres@anarazel.de> wrote:
> > Attached is v6. Changes:
> 
> 0006:
> 
> +        ereport(ERROR,
> +            errcode_for_file_access(),
> +            errmsg("could not extend file \"%s\" with posix_fallocate():
> %m",
> +                 FilePathName(v->mdfd_vfd)),
> +            errhint("Check free disk space."));
> 
> Portability nit: mdzeroextend() doesn't know whether posix_fallocate() was
> used in FileFallocate().

Fair point. I would however like to see a different error message for the two
ways of extending, at least initially. What about referencing FileFallocate()?

Greetings,

Andres Freund