Re: btrfs loses 32-bit application compatibility after a while

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On Fri, Jul 14, 2023 at 9:58 AM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote:
>
> On Fri, Jul 14, 2023 at 09:49:04AM -0400, Neal Gompa wrote:
> > On Fri, Jul 14, 2023 at 8:48 AM Florian Weimer <fweimer@xxxxxxxxxx> wrote:
> > >
> > > * Miroslav Suchý:
> > >
> > > > Dne 14. 07. 23 v 13:53 Florian Weimer napsal(a):
> > > >> What about impact beyond the builders?
> > > >>
> > > >> Are end users are expected to do this?  Do we have a tool for this?
> > > >
> > > > Close to zero. You have to do a really lots of builds. And keep the
> > > > buildroots of these (failed) builds.
> > >
> > > This is not restricted to mock or Koji, though.  There just needs to be
> > > one application that creates and deletes many files (or produces other
> > > events that causes object ID allocation in btrfs).
> > >
> > > For me it's going to be slow enough that the file system will likely be
> > > recreated before I encounter the 31-bit object ID limit.  But I wonder
> > > if that's true for everyone.
> > >
> >
> > I don't know of a 32-bit workload that would trigger this reliably and
> > reasonably quickly, but if there is one, then I would be interested in
> > knowing about it.
>
> The 32-bit binary is what suffers the consequences.
>
> The workload that /causes/ the problem can be anything which creates
> lots of files.
>

I am aware of that, but having something concretely easily
reproducible that appears realistic makes it a lot easier for me to
talk to them about doing something to address it. Otherwise it's all
just hypothetical and the conversation gets difficult.



-- 
真実はいつも一つ!/ Always, there's only one truth!
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