linux-ext4 - Re: [PATCH 0 of 7] Block/SCSI Data Integrity Support

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Message-ID: <170fa0d20807170655y6cb7df7eh6aae8c727b7b0bb@mail.gmail.com>
Date:	Thu, 17 Jul 2008 09:55:45 -0400
From:	"Mike Snitzer" <snitzer@...il.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	"Jeff Moyer" <jmoyer@...hat.com>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 0 of 7] Block/SCSI Data Integrity Support

On Tue, Jun 10, 2008 at 11:28 AM, Martin K. Petersen
<martin.petersen@...cle.com> wrote:
>>>>>> "Jeff" == Jeff Moyer <jmoyer@...hat.com> writes:
>
> Jeff> Thanks for all of the great documentation.  It would be good to
> Jeff> include some instructions on how one would test this, and what
> Jeff> testing you performed.
>
> modprobe scsi_debug dix=199 dif=1 guard=1 dev_size_mb=1024 num_parts=1
>
> I'm testing with XFS and btrfs.  Generally doing kernel builds, etc.
> ext2/3 are still problematic because they modify pages in flight.

Have you made the ext2/3/4 developers aware of this?

Could you elaborate on the interaction between the data integrity
support in the block layer and a given filesystem?  Shouldn't _any_
filesystem "just work" given that the block layer is what is
generating the checksums and then verifying them on read?

regards,
Mike
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