On 2015-07-02 23:43:17 +0300, Heikki Linnakangas wrote:
> >You'd need, afaics, a bgworker that connects to every database to read
> >pg_class, to figure out what type of page a relfilenode has. And this
> >probably should call back into the relevant AM or such.
>
> Nah, we already assume that every relation data file follows the standard
> page format, at least enough to have the checksum field at the right
> location. See FlushBuffer() - it just unconditionally calculates the
> checksum before writing out the page. (I'm not totally happy about that, but
> that ship has sailed)
Ugh, I'd forgotten about that.