linux-ext4 - Re: [PATCH] jbd2: correctly unescape journal data blocks

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Message-Id: <20080317165513.b6522637.akpm@linux-foundation.org>
Date:	Mon, 17 Mar 2008 16:55:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Duane Griffin" <duaneg@...da.com>
Cc:	sct@...hat.com, linux-ext4@...r.kernel.org, duaneg@...da.com,
	Mingming Cao <cmm@...ibm.com>, "Theodore Ts'o" <tytso@....edu>
Subject: Re: [PATCH] jbd2: correctly unescape journal data blocks

On Sat, 15 Mar 2008 18:49:45 +0000
"Duane Griffin" <duaneg@...da.com> wrote:

> Fix a long-standing typo (predating git) that will cause data corruption if a
> journal data block needs unescaping. At the moment the wrong buffer head's data
> is being unescaped.
> 
> To test this case mount a filesystem with data=journal, start creating and
> deleting a bunch of files containing only JBD2_MAGIC_NUMBER (0xc03b3998), then
> pull the plug on the device. Without this patch the files will contain zeros
> instead of the correct data after recovery.
> 
> Signed-off-by: Duane Griffin <duaneg@...da.com>
> ---
>  fs/jbd2/recovery.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
> index 1464113..5d0405a 100644
> --- a/fs/jbd2/recovery.c
> +++ b/fs/jbd2/recovery.c
> @@ -535,7 +535,7 @@ static int do_one_pass(journal_t *journal,
>  					memcpy(nbh->b_data, obh->b_data,
>  							journal->j_blocksize);
>  					if (flags & JBD2_FLAG_ESCAPE) {
> -						*((__be32 *)bh->b_data) =
> +						*((__be32 *)nbh->b_data) =
>  						cpu_to_be32(JBD2_MAGIC_NUMBER);
>  					}
>  

Thanks.  Ted, I'll scoot this into Linus and stable@...nel.org tomorrowish.

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