From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 14 Nov 2013 16:50:33 +0000 (-0800)
Subject: nfs: take i_mutex during direct I/O reads
X-Git-Tag: v3.14-rc1~77^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0b9875d65c1abcc9d405d648660dfb919353959;p=pandora-kernel.git

nfs: take i_mutex during direct I/O reads

We'll need the i_mutex to prevent i_dio_count from incrementing while
truncate is waiting for it to reach zero, and protects against having
the pagecache repopulated after we flushed it.

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