Thanks a lot Tom.
On Tue, Jul 13, 2021 at 2:37 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Amul Sul <sulamul@gmail.com> writes:
> > [ v5_Add-RelationGetSmgr-inline-function.patch ]
>
> Pushed with minor cosmetic adjustments.
>
> RelationCopyStorage() kind of gives me the willies.
> It's not really an smgr-level function, but we call it
> everywhere with smgr pointers that belong to relcache entries:
>
> /* copy main fork */
> - RelationCopyStorage(rel->rd_smgr, dstrel, MAIN_FORKNUM,
> + RelationCopyStorage(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
> rel->rd_rel->relpersistence);
>
> So that would fail hard if a relcache flush could occur inside
> that function. It seems impossible today, so I settled for
> just annotating the function to that effect. But it won't
> surprise me a bit if somebody breaks it in future due to not
> having read/understood the comment.
>
> regards, tom lane