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

[Dave Chinner <david fromorbit com>]

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 yk jp nec com>
> Signed-off-by: Masayuki Hamaguchi <m-hamaguchi ys 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 fromorbit com