From 086352f1aa8d717eaf565074d6634c7bdd26aca0 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@redhat.com>
Date: Tue, 14 Jan 2014 13:46:51 +0000
Subject: [PATCH] GFS2: No need to invalidate pages for a dio read

We recently fixed the writeback of pages prior to performing
direct i/o, however the initial fix was perhaps a bit heavy
handed. There is no need to invalidate pages if the direct i/o
is only a read, since they will be identical to what has been
flushed to disk anyway.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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