From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 28 Oct 2014 22:27:28 +0000 (-0400)
Subject: overlayfs: barriers for opening upper-layer directory
X-Git-Tag: omap-for-v3.19/fixes-not-urgent-part1~14^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d45f00ae43e63eff1b3d79df20610ae1ef645ebd;p=pandora-kernel.git

overlayfs: barriers for opening upper-layer directory

make sure that
	a) all stores done by opening struct file don't leak past storing
the reference in od->upperfile
	b) the lockless side has read dependency barrier

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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