linux-kernel - Re: [PATCH] dm snapshot: implement .iterate

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Message-Id: <20090824141536.30df105c.akpm@linux-foundation.org>
Date:	Mon, 24 Aug 2009 14:15:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dm snapshot: implement .iterate_devices

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?

> 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).

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