linux-kernel - Re: [RFC PATCH] dm-csum: A new device mapper target that checks data integrity

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Message-ID: <20090521191704.GX1376@blitiri.com.ar>
Date:	Thu, 21 May 2009 16:17:04 -0300
From:	Alberto Bertogli <albertito@...tiri.com.ar>
To:	Greg Freemyer <greg.freemyer@...il.com>
Cc:	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, agk@...hat.com, neilb@...e.de
Subject: Re: [RFC PATCH] dm-csum: A new device mapper target that checks
	data integrity

On Thu, May 21, 2009 at 02:17:58PM -0400, Greg Freemyer wrote:
> On Thu, May 21, 2009 at 12:13 PM, Alberto Bertogli
> <albertito@...tiri.com.ar> wrote:
> > I'm writing this device mapper target that stores checksums on writes and
> > verifies them on reads.
> 
> I have not looked at your patch, but does this tie into the integrity
> logic that was added to mainline a few months ago?

At the moment it has no relation, but making dm-csum devices register with the
bio integrity extensions is on my to-do list, and the on-disk format already
reserves 32 bits for every 512-byte sector for tagging purposes.

Thanks,
		Alberto

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