linux-ext4 - Re: [PATCH 5/5] ext3: abort ext3 if the journal has aborted

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Message-ID: <20080602124944.GM30613@duck.suse.cz>
Date:	Mon, 2 Jun 2008 14:49:44 +0200
From:	Jan Kara <jack@...e.cz>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	akpm@...ux-foundation.org, 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,
	sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>
Subject: Re: [PATCH 5/5] ext3: abort ext3 if the journal has aborted

On Mon 02-06-08 19:48:41, Hidehiro Kawai wrote:
> Subject: [PATCH 5/5] ext3: abort ext3 if the journal has aborted
> 
> If the journal has aborted due to a checkpointing failure, we
> have to keep the contents of the journal space.  ext3_put_super()
> detects the journal abort, then it invokes ext3_abort() to make
> the filesystem read only and keep needs_recovery flag.
> 
> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
...
> @@ -2373,7 +2374,13 @@ static void ext3_write_super_lockfs(stru
>  
>  		/* Now we set up the journal barrier. */
>  		journal_lock_updates(journal);
> -		journal_flush(journal);
> +
> +		/*
> +		 * We don't want to clear needs_recovery flag when we failed
> +		 * to flush the journal.
> +		 */
> +		if (journal_flush(journal) < 0)
> +			return;
>  
>  		/* Journal blocked and flushed, clear needs_recovery flag. */
>  		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
  It's a bit scary that LVM will start creating filesystem snapshot when
journal_flush() failed but since there's no way to propagate error further
up, I guess we cannot do anything better.
  You can add:
    Acked-by: Jan Kara <jack@...e.cz>

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