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Date: Fri, 15 Apr 2011 04:09:16 -0400
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/2] xfs: kick inode writeback when low on memory
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To: Dave Chinner <david@fromorbit.com>
Cc: linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com, Alex Elder <aelder@sgi.com>

On Thu, Apr 14, 2011 at 03:08:46PM +1000, Dave Chinner wrote:
> Unfortunately, we simply can't take the s_umount lock in reclaim
> context. So further hackery is going to be required here - I think
> that writeback_inodes_sb_nr_if_idle() need to use trylocks. if the
> s_umount lock is taken in write mode, then it's pretty certain that
> the sb is busy....

http://thread.gmane.org/gmane.linux.file-systems/48373/focus=48628

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