"xfs: fix error handling for synchronous writes" revisited

[Ajeet Yadav]

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);