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Date:	Thu, 20 Sep 2012 11:54:49 -0400
From:	Theodore Ts'o <>
To:	Tao Ma <>
Subject: Re: [PATCH] ext4: Don't calc checksum in update_backups in online

On Thu, Sep 20, 2012 at 02:33:43PM +0800, Tao Ma wrote:
> From: Tao Ma <>
> update_backups is used to backup all the metadata blocks, so we should
> not take it for granted that 'data' is pointed to a super block and use
> ext4_superblock_csum_set to calculate the checksum there. In case
> the data is a group descriptor block, it will corrupt the last group
> descriptor. And e2fsck will complain it.
> As all the metadata checksum should already be OK when we do the backup,
> remove the wrong ext4_superblock_csum_set and it should be just fine.
> Reported-by: "Theodore Ts'o" <>
> Signed-off-by: Tao Ma <>

Applied.  Thanks for finding the fix!!

					- Ted
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