From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id o5QBjldE193867 for ; Sat, 26 Jun 2010 06:45:47 -0500 Received: from bombadil.infradead.org (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id E53B0131CD3B for ; Sat, 26 Jun 2010 04:53:03 -0700 (PDT) Received: from bombadil.infradead.org (bombadil.infradead.org [18.85.46.34]) by cuda.sgi.com with ESMTP id oYpyKFQFUbyJRtxb for ; Sat, 26 Jun 2010 04:53:03 -0700 (PDT) Date: Sat, 26 Jun 2010 07:48:30 -0400 From: Christoph Hellwig Subject: Re: [PATCH] xfs: unregister inode shrinker before freeing filesystem structures Message-ID: <20100626114830.GD15157@infradead.org> References: <1277428120-27216-1-git-send-email-david@fromorbit.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1277428120-27216-1-git-send-email-david@fromorbit.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Dave Chinner Cc: xfs@oss.sgi.com On Fri, Jun 25, 2010 at 11:08:40AM +1000, Dave Chinner wrote: > From: Dave Chinner > > Currently we don't remove the XFS mount from the shrinker list until late in > the unmount path. By this time, we have already torn down the internals of the > filesystem (e.g. the per-ag structures), and hence if the shrinker is executed > between the teardown and the unregistering, the shrinker will get NULL per-ag > structure pointers and panic trying to dereference them. > > Fix this by removingthe xfs mount from the shrinker list before tearing down > it's internal structures. > > Signed-off-by: Dave Chinner > --- > fs/xfs/linux-2.6/xfs_super.c | 6 +++++- > 1 files changed, 5 insertions(+), 1 deletions(-) > > diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c > index e3de46c..4605cd4 100644 > --- a/fs/xfs/linux-2.6/xfs_super.c > +++ b/fs/xfs/linux-2.6/xfs_super.c > @@ -1156,9 +1156,13 @@ xfs_fs_put_super( > > XFS_bflush(mp->m_ddev_targp); > > + /* > + * Unregister the memory shrinker before we tear down the mount > + * structure so we don't have memory reclaim racing with us here. > + */ > + xfs_inode_shrinker_unregister(mp); Given that we register the shrinker after syncd is started for we should also tear it down as the very first thing for symmetry resons. _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs