Re: Refactoring xlogutils.c

"Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> writes:
> Tom Lane wrote:
>> The code motion in md.c looks fairly bogus; was that a copy-and-paste
>> error?

> That's intentional. That check has been moved to smgrcreate(), so that
> it's done before calling TablespaceCreateDbSpace(). The reason for that
> is that smgrcreate() is now called for every XLogReadBuffer()
> invocation, so we want to make it exit quickly if there's nothing to do.

Oh, I see --- I misread the patch the first time. That seems like a
reasonable change.

> On second look though, I think we should actually leave that check in
> mdcreate(). Even though it'd be dead code since we do the same check in
> smgrcreate already, removing it changes the semantics of mdcreate():
> it'd no longer be acceptable to call mdcreate() if the file is open already.

I don't believe there is any way to call mdcreate except through
smgrcreate, so this is probably not a problem.

regards, tom lane