From: Christoph Hellwig <hch@lst.de>
Date: Fri, 8 Jul 2011 12:34:42 +0000 (+0200)
Subject: xfs: fix filesystsem freeze race in xfs_trans_alloc
X-Git-Tag: v3.1-rc1~322^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7a249cf83da1813cfa71cfe1e265b40045eceb47;p=pandora-kernel.git

xfs: fix filesystsem freeze race in xfs_trans_alloc

As pointed out by Jan xfs_trans_alloc can race with a concurrent filesystem
freeze when it sleeps during the memory allocation.  Fix this by moving the
wait_for_freeze call after the memory allocation.  This means moving the
freeze into the low-level _xfs_trans_alloc helper, which thus grows a new
argument.  Also fix up some comments in that area while at it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <david@fromorbit.com>
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