linux-ext4 - Re: [PATCH] ext4: avoid modifying checksum fields directly during checksum verification

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Message-ID: <20160703220513.GB17739@thunk.org>
Date:	Sun, 3 Jul 2016 18:05:13 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Daeho Jeong <daeho.jeong@...sung.com>
Cc:	darrick.wong@...cle.com, linux-ext4@...r.kernel.org,
	Youngjin Gil <youngjin.gil@...sung.com>
Subject: Re: [PATCH] ext4: avoid modifying checksum fields directly during
 checksum verification

On Wed, Jun 15, 2016 at 03:12:53PM +0900, Daeho Jeong wrote:
> We temporally change checksum fields in buffers of some types of
> metadata into '0' for verifying the checksum values. By doing this
> without locking the buffer, some metadata's checksums, which are
> being committed or written back to the storage, could be damaged.
> In our test, several metadata blocks were found with damaged metadata
> checksum value during recovery process. When we only verify the
> checksum value, we have to avoid modifying checksum fields directly.
> 
> Signed-off-by: Daeho Jeong <daeho.jeong@...sung.com>
> Signed-off-by: Youngjin Gil <youngjin.gil@...sung.com>

Applied, thanks!

						- Ted
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