linux-kernel - Re: [PATCH 3/5] jbd: abort when failed to log metadata buffers

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Message-Id: <20080603153506.8a9ca2a4.akpm@linux-foundation.org>
Date:	Tue, 3 Jun 2008 15:35:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	sct@...hat.com, adilger@...sterfs.com,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	jack@...e.cz, jbacik@...hat.com, cmm@...ibm.com, tytso@....edu,
	yumiko.sugita.yf@...achi.com, satoshi.oshima.fk@...achi.com
Subject: Re: [PATCH 3/5] jbd: abort when failed to log metadata buffers

On Mon, 02 Jun 2008 19:46:02 +0900
Hidehiro Kawai <hidehiro.kawai.ez@...achi.com> wrote:

> Subject: [PATCH 3/5] 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-rc4/fs/jbd/commit.c
> ===================================================================
> --- linux-2.6.26-rc4.orig/fs/jbd/commit.c
> +++ linux-2.6.26-rc4/fs/jbd/commit.c
> @@ -734,6 +734,9 @@ wait_for_iobuf:
>  		/* AKPM: bforget here */
>  	}
>  
> +	if (err)
> +		journal_abort(journal, err);
> +
>  	jbd_debug(3, "JBD: commit phase 6\n");
>  
>  	if (journal_write_commit_record(journal, commit_transaction))
> 

I assume this has all been tested?

How are you finding these problems and testing the fixes?  Fault
injection?

Does it make sense to proceed into phase 6 here, or should we bale out
of commit at this point?

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