From 4db72b40fdbc706f8957e9773ae73b1574b8c694 Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 28 Jan 2014 13:47:46 -0500
Subject: [PATCH] nfs: add memory barriers around NFS_INO_INVALID_DATA and
 NFS_INO_INVALIDATING

If the setting of NFS_INO_INVALIDATING gets reordered to before the
clearing of NFS_INO_INVALID_DATA, then another task may hit a race
window where both appear to be clear, even though the inode's pages are
still in need of invalidation. Fix this by adding the appropriate memory
barriers.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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