"xfs: fix error handling for synchronous writes" revisited

[Christoph Hellwig]

Looks good.

Alex, any chance to pick this one up for 3.1?


Reviewed-by: Christoph Hellwig <hch at lst.de>

On Fri, Jul 29, 2011 at 01:12:59PM +0530, Ajeet Yadav wrote:
> xfs: fix for hang during synchronous buffer write error
> 
> If removed storage while synchronous buffer write underway,
> "xfslogd" hangs.
> 
> Detailed log http://oss.sgi.com/archives/xfs/2011-07/msg00740.html
> 
> Related work bfc60177f8ab509bc225becbb58f7e53a0e33e81
> "xfs: fix error handling for synchronous writes"
> 
> Given that xfs_bwrite actually does the shutdown already after
> waiting for the b_iodone completion and given that we actually
> found that calling xfs_force_shutdown from inside
> xfs_buf_iodone_callbacks was a major contributor the problem
> it better to drop this call.
> 
> Signed-off-by: Ajeet Yadav <ajeet.yadav.77 at gmail.com>
> 
> diff -Nurp -X linux/Documentation/dontdiff linux/fs/xfs/xfs_buf_item.c
> linux-Dirty/fs/xfs/xfs_buf_item.c
> --- linux/fs/xfs/xfs_buf_item.c 2011-06-09 10:05:18.000000000 +0530
> +++ linux-Dirty/fs/xfs/xfs_buf_item.c   2011-07-28 15:53:51.000000000 +0530
> @@ -1028,7 +1028,6 @@ xfs_buf_iodone_callbacks(
>         XFS_BUF_UNDELAYWRITE(bp);
> 
>         trace_xfs_buf_error_relse(bp, _RET_IP_);
> -       xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
> 
>  do_callbacks:
>         xfs_buf_do_callbacks(bp, lip);
> 
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