From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 28 Jan 2014 18:47:46 +0000 (-0500)
Subject: nfs: add memory barriers around NFS_INO_INVALID_DATA and NFS_INO_INVALIDATING
X-Git-Tag: v3.14-rc1~15^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4db72b40fdbc706f8957e9773ae73b1574b8c694;p=pandora-kernel.git

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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