linux-kernel - Re: dm snapshot: implement .iterate

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Message-ID: <20090824225514.GA30263@redhat.com>
Date:	Mon, 24 Aug 2009 18:55:15 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: dm snapshot: implement .iterate_devices

On Mon, Aug 24 2009 at  5:15pm -0400,
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Sun, 23 Aug 2009 02:11:07 -0400
> Mike Snitzer <snitzer@...hat.com> wrote:
> 
> > This patch implements .iterate_devices for the origin and snapshot
> > targets.  dm-snapshot's lack of .iterate_devices resulted in the
> > inability to properly establish queue_limits for both targets.  
> > 
> > With 4K sector drives: an unfortunate side-effect of not establishing
> > proper limits in either targets' DM device was that IO to the devices
> > would fail even though both had been created without error.
> 
> Does this make the patch a regression fix?

Yes.
 
> > Commit af4874e03ed82f050d5872d8c39ce64bf16b5c38 should have implemented
> > .iterate_devices for dm-snap.c's origin and snapshot targets.
> 
> Please use the form af4874e03ed82f050d5872d8c39ce64bf16b5c38 ("dm
> target:s introduce iterate devices fn") when referring to commits. 
> Because commits might have different IDs in different trees (I think
> that's the reason).

OK, thanks for picking this up.  I believe Alasdair is back from
vacation tomorrow and will be pushing other remaining DM fixes for
2.6.31 final.

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