linux-kernel - Re: [PATCH] xfs: fix regression in "cleanup xfs_dir2_block

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Date:   Thu, 12 Mar 2020 10:01:28 +0100
From:   Christoph Hellwig <hch@....de>
To:     Tommi Rantala <tommi.t.rantala@...ia.com>
Cc:     Christoph Hellwig <hch@....de>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: fix regression in "cleanup
 xfs_dir2_block_getdents"

On Thu, Mar 12, 2020 at 10:57:28AM +0200, Tommi Rantala wrote:
> Commit 263dde869bd09 ("xfs: cleanup xfs_dir2_block_getdents") introduced
> a getdents regression, when it converted the pointer arithmetics to
> offset calculations: offset is updated in the loop already for the next
> iteration, but the updated offset value is used incorrectly in two
> places, where we should have used the not-yet-updated value.
> 
> This caused for example "git clean -ffdx" failures to cleanup certain
> directory structures when running in a container.
> 
> Fix the regression by making sure we use proper offset in the loop body.
> Thanks to Christoph Hellwig for suggestion how to best fix the code.
> 
> Cc: Christoph Hellwig <hch@....de>
> Fixes: 263dde869bd09 ("xfs: cleanup xfs_dir2_block_getdents")
> Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>