From: Andreas Dilger <adilger@sun.com>
To: Alberto Bertogli <albertito@blitiri.com.ar>,
Alex Zhuravlev <Alex.Zhuravlev@sun.com>
Cc: Theodore Tso <tytso@MIT.EDU>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
dm-devel@redhat.com
Subject: Re: jbd2 inside a device mapper module
Date: Sat, 27 Dec 2008 13:01:27 -0700 [thread overview]
Message-ID: <20081227200127.GX5000@webber.adilger.int> (raw)
In-Reply-To: <20081225143535.GA4127@blitiri.com.ar>
On Dec 25, 2008 12:35 -0200, Alberto Bertogli wrote:
> On Wed, Dec 24, 2008 at 06:49:15PM -0500, Theodore Tso wrote:
> > I have no idea why you would need to do manual __breads(). No doubt
> > I'm missing some context here.
>
> I'm writing (just for fun and learning purposes) a device mapper module
> that stores checksums on writes and verifies them on reads. The
> integrity metadata (currently just the checksum) is interleaved in the
> backing device: one sector holding the integrity metadata for the
> following 64 data sectors.
Alex and I discussed implementing checksums for ext4 using an external
device like this, and he might have some more design information for
you.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
next prev parent reply other threads:[~2008-12-27 20:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-24 21:10 jbd2 inside a device mapper module Alberto Bertogli
2008-12-24 22:38 ` Alberto Bertogli
2008-12-24 23:49 ` Theodore Tso
2008-12-25 14:35 ` Alberto Bertogli
2008-12-25 15:52 ` Theodore Tso
2008-12-25 15:52 ` Theodore Tso
2008-12-26 0:00 ` Alberto Bertogli
2008-12-26 3:37 ` Theodore Tso
2008-12-26 3:37 ` Theodore Tso
2008-12-26 16:17 ` Alberto Bertogli
2008-12-26 18:06 ` Theodore Tso
2008-12-26 18:06 ` Theodore Tso
2008-12-27 3:00 ` Alberto Bertogli
2008-12-27 19:29 ` Theodore Tso
2008-12-27 19:29 ` Theodore Tso
2008-12-29 21:30 ` Alberto Bertogli
2008-12-27 20:01 ` Andreas Dilger [this message]
2008-12-29 6:20 ` Shyam_Iyer
2008-12-29 6:20 ` Shyam_Iyer
2008-12-29 21:05 ` [dm-devel] " Alberto Bertogli
2008-12-30 6:55 ` Alex Tomas
2008-12-30 13:51 ` Alberto Bertogli
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