From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 14 Nov 2013 16:50:34 +0000 (-0800)
Subject: nfs: page cache invalidation for dio
X-Git-Tag: v3.14-rc1~77^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a9ab5e840669b19aca2974e2c771a77df2876434;p=pandora-kernel.git

nfs: page cache invalidation for dio

Make sure to properly invalidate the pagecache before performing direct I/O,
so that no stale pages are left around.  This matches what the generic
direct I/O code does.  Also take the i_mutex over the direct write submission
to avoid the lifelock vs truncate waiting for i_dio_count to decrease, and
to avoid having the pagecache easily repopulated while direct I/O is in
progrss.  Again matching the generic direct I/O code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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