From: Weston Andros Adamson <dros@netapp.com>
Date: Wed, 1 Jun 2011 01:46:50 +0000 (-0400)
Subject: NFS: fix umount of pnfs filesystems
X-Git-Tag: v3.0-rc5~51^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e3bd4e24e94d60d2e0762e919aab6c9a7fc0c5b;p=pandora-kernel.git

NFS: fix umount of pnfs filesystems

Unmounting a pnfs filesystem hangs using filelayout and possibly others.
This fixes the use of the rcu protected node by making use of a new 'tmpnode'
for the temporary purge list. Also, the spinlock shouldn't be held when calling
synchronize_rcu().

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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