linux-kernel - Re: [PATCH] md: Fix data corruption when a degraded raid5 array is reshaped.

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Date:	Thu, 03 Jan 2008 16:00:34 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	NeilBrown <neilb@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH] md: Fix data corruption when a degraded raid5 array is
	reshaped.

On Thu, 2008-01-03 at 15:46 -0700, NeilBrown wrote:
> This patch fixes a fairly serious bug in md/raid5 in 2.6.23 and 24-rc.
> It would be great if it cold get into 23.13 and 24.final.
> Thanks.
> NeilBrown
> 
> ### Comments for Changeset
> 
> We currently do not wait for the block from the missing device
> to be computed from parity before copying data to the new stripe
> layout.
> 
> The change in the raid6 code is not techincally needed as we
> don't delay data block recovery in the same way for raid6 yet.
> But making the change now is safer long-term.
> 
> This bug exists in 2.6.23 and 2.6.24-rc
> 
> Cc: stable@...nel.org
> Cc: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Neil Brown <neilb@...e.de>
> 
Acked-by: Dan Williams <dan.j.williams@...el.com>



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