Re: regression test failed when enabling checksum

On Tue, 2013-03-26 at 02:50 +0900, Fujii Masao wrote:
> Hi,
> 
> I found that the regression test failed when I created the database
> cluster with the checksum and set wal_level to archive. I think that
> there are some bugs around checksum feature. Attached is the regression.diff.

Thank you for the report. This was a significant oversight, but simple
to diagnose and fix.

There were several places that were doing something like:

   PageSetChecksumInplace
   if (use_wal)
      log_newpage
   smgrextend

Which is obviously wrong, because log_newpage set the LSN of the page,
invalidating the checksum. We need to set the checksum after
log_newpage.

Also, I noticed that copy_relation_data was doing smgrread without
validating the checksum (or page header, for that matter), so I also
fixed that.

Patch attached. Only brief testing done, so I might have missed
something. I will look more closely later.

Regards,
	Jeff Davis