From 97216be09efd41414725068212e3af0f05cde11a Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 16 Mar 2013 15:12:40 -0400
Subject: [PATCH] fold release_mounts() into namespace_unlock()

... and provide namespace_lock() as a trivial wrapper;
switch to those two consistently.

Result is patterned after rtnl_lock/rtnl_unlock pair.

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