linux-kernel - Re: [PATCH 4/10] xfs: Fix error handling in write_super

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Message-ID: <20080922234120.GV5811@disturbed>
Date:	Tue, 23 Sep 2008 09:41:20 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Takashi Sato <t-sato@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"xfs@....sgi.com" <xfs@....sgi.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"mtk.manpages@...glemail.com" <mtk.manpages@...glemail.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/10] xfs: Fix error handling in
	write_super_lockfs/unlockfs

On Mon, Sep 22, 2008 at 07:56:37PM +0900, Takashi Sato wrote:
> I've changed write_super_lockfs/unlockfs so that they always return
> 0 (success) to keep a current behavior.
> 
> Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
> Signed-off-by: Masayuki Hamaguchi <m-hamaguchi@...jp.nec.com>
> ---
>  xfs_super.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff -uprN -X linux-2.6.27-rc7-lockfs/Documentation/dontdiff linux-2.6.27-rc7-lockfs/fs/xfs/linux-2.6/xfs_super.c linux-
> 2.6.27-rc7-lockfs-xfs/fs/xfs/linux-2.6/xfs_super.c
> --- linux-2.6.27-rc7-lockfs/fs/xfs/linux-2.6/xfs_super.c	2008-09-22 07:29:55.000000000 +0900
> +++ linux-2.6.27-rc7-lockfs-xfs/fs/xfs/linux-2.6/xfs_super.c	2008-09-22 10:13:39.000000000 +0900
> @@ -1351,7 +1351,7 @@ xfs_fs_remount(
>   * need to take care of themetadata. Once that's done write a dummy
>   * record to dirty the log in case of a crash while frozen.
>   */
> -STATIC void
> +STATIC int
>  xfs_fs_lockfs(
>  	struct super_block	*sb)
>  {
> @@ -1359,6 +1359,7 @@ xfs_fs_lockfs(
>  
>  	xfs_attr_quiesce(mp);
>  	xfs_fs_log_dummy(mp);
> +	return 0;
>  }

xfs_fs_log_dummy() currently is void because it had nowhere to
return errors to. It silently throws away errors because of this.
Hence the correct thing to do here is to fix xfs_fs_log_dummy()
to return the errors it currently ignores. i.e. catch the errors
from xfs_trans_reserve() and xfs_trans_commit() calls in
xfs_fs_log_dummy().

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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