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Re: [PATCH 4/10] xfs: Fix error handling in write_super_lockfs/unlockfs

To: Takashi Sato <t-sato@xxxxxxxxxxxxx>
Subject: Re: [PATCH 4/10] xfs: Fix error handling in write_super_lockfs/unlockfs
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 23 Sep 2008 09:41:20 +1000
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "dm-devel@xxxxxxxxxx" <dm-devel@xxxxxxxxxx>, "viro@xxxxxxxxxxxxxxxxxx" <viro@xxxxxxxxxxxxxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>, "mtk.manpages@xxxxxxxxxxxxxx" <mtk.manpages@xxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <20080922195637t-sato@xxxxxxxxxxxxxxx>
Mail-followup-to: Takashi Sato <t-sato@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "dm-devel@xxxxxxxxxx" <dm-devel@xxxxxxxxxx>, "viro@xxxxxxxxxxxxxxxxxx" <viro@xxxxxxxxxxxxxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>, "mtk.manpages@xxxxxxxxxxxxxx" <mtk.manpages@xxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
References: <20080922195637t-sato@xxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
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@xxxxxxxxxxxxx>
> Signed-off-by: Masayuki Hamaguchi <m-hamaguchi@xxxxxxxxxxxxx>
> ---
>  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@xxxxxxxxxxxxx

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