From: Christoph Hellwig <hch@infradead.org>
To: Joe Thornber <thornber@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
dm-devel@redhat.com, ejt@redhat.com
Subject: Re: dm-thinp bug
Date: Wed, 27 Apr 2011 04:39:17 -0400 [thread overview]
Message-ID: <20110427083917.GA23330@infradead.org> (raw)
In-Reply-To: <1303892857.4679.2.camel@ubuntu>
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.
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.
next prev parent reply other threads:[~2011-04-27 8:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-26 18:47 dm-thinp bug Christoph Hellwig
2011-04-27 8:27 ` Joe Thornber
2011-04-27 8:39 ` Christoph Hellwig [this message]
2011-04-27 9:23 ` Joe Thornber
2011-04-27 9:08 ` Joe Thornber
2011-04-27 9:32 ` Christoph Hellwig
2011-04-27 9:52 ` Joe Thornber
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