[dm-devel] dm-thinp bug
Joe Thornber
thornber at redhat.com
Wed Apr 27 09:23:40 UTC 2011
On Wed, 2011-04-27 at 04:39 -0400, Christoph Hellwig wrote:
> On Wed, Apr 27, 2011 at 09:27:37AM +0100, Joe Thornber wrote:
> > On Tue, 2011-04-26 at 14:47 -0400, Christoph Hellwig wrote:
> > > I can reproduce a bug in virtio triggered by running under dm-thinp by
> > > just copying lots of files from my home directory into a freshly created
> > > filesystem on dm-thinp.
> >
> > Finally someone has tried using it! I'll look into this today.
>
> I actually used the earlier version you posted and didn't reproduce it
> there. I have a gut feeling it's related to barriers, as I probably
> just did a basic ext3 test back then.
I hope this isn't the case.
>
> One thing that springs to mind is that both the thinp and multisnap
> targets don't appear to support empty barriers (that is REQ_FLUSH
> without a payload), because they don't set ti->num_flush_requests, but
> I'm not sure that's related.
Fixed in thinp and multisnap public repos.
- Joe
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