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Re: [PATCH 01/19] xfs: growfs: don't read garbage for new secondary supe

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 01/19] xfs: growfs: don't read garbage for new secondary superblocks
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 11 Oct 2012 17:34:23 -0400
Cc: xfs@xxxxxxxxxxx
In-reply-to: <1349754670-32009-2-git-send-email-david@xxxxxxxxxxxxx>
References: <1349754670-32009-1-git-send-email-david@xxxxxxxxxxxxx> <1349754670-32009-2-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Oct 09, 2012 at 02:50:52PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> When updating new secondary superblocks in a growfs operation, the
> sueprblock buffer is read from the newly grown region of the
> underlying device. This is not guaranteed to be zero, so violates
> the underlying assumption that the unused parts of superblocks are
> zero filled. Get a new buffer for these secondary superblocks to
> ensure that the unused regions are zero filled correctly.
> 
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>

Looks good,

Reviewed-by: Christoph Hellwig <hch@xxxxxx>

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