linux-ext4 - Re: [PATCH 3/4] jbd: abort when failed to log metadata buffers (rebased)

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Date:	Wed, 14 May 2008 15:15:06 +0200
From:	Jan Kara <jack@...e.cz>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, sct@...hat.com,
	adilger@...sterfs.com, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>,
	Josef Bacik <jbacik@...hat.com>, Mingming Cao <cmm@...ibm.com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>,
	sugita <yumiko.sugita.yf@...achi.com>
Subject: Re: [PATCH 3/4] jbd: abort when failed to log metadata buffers
	(rebased)

On Wed 14-05-08 13:49:51, Hidehiro Kawai wrote:
> Subject: [PATCH 3/4] jbd: abort when failed to log metadata buffers
> 
> If we failed to write metadata buffers to the journal space and
> succeeded to write the commit record, stale data can be written
> back to the filesystem as metadata in the recovery phase.
> 
> To avoid this, when we failed to write out metadata buffers,
> abort the journal before writing the commit record.
> 
> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
> ---
>  fs/jbd/commit.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> Index: linux-2.6.26-rc2/fs/jbd/commit.c
> ===================================================================
> --- linux-2.6.26-rc2.orig/fs/jbd/commit.c
> +++ linux-2.6.26-rc2/fs/jbd/commit.c
> @@ -703,6 +703,9 @@ wait_for_iobuf:
>  		__brelse(bh);
>  	}
>  
> +	if (err)
> +		journal_abort(journal, err);
> +
>  	J_ASSERT (commit_transaction->t_shadow_list == NULL);
  Shouldn't this rather be further just before
journal_write_commit_record()? We should abort also if writing revoke
records etc. failed, shouldn't we?

>  	jbd_debug(3, "JBD: commit phase 5\n");
> 

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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