From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [BUG] ext3: cannot unfreeze a filesystem due to a deadlock
Date: Wed, 7 Sep 2011 13:17:28 -0400
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Cc: Christoph Hellwig <hch@infradead.org>,
	Greg Freemyer <greg.freemyer@gmail.com>,
	Masayoshi MIZUMA <m.mizuma@jp.fujitsu.com>,
	Jan Kara <jack@suse.cz>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org
To: Eric Sandeen <sandeen@redhat.com>
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On Wed, Sep 07, 2011 at 12:10:07PM -0500, Eric Sandeen wrote:
> > If you have recent enough xfsprogs that allow the freeze command
> > for foreign filesystems that might work. 
> 
> where "recent enough" is since Tue Feb 10 14:41:51 2009 -0600
> 
> I say go for it :)
> 
> Could always add a quick helper to make sure the xfs_io command
> doesn't fail on freeze, and _notrun if it does.

With the _notrun trick it could probably even claim generic fs
support.