From 328e6d9014636afc2b3c979403b36faadb412657 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 16 Mar 2013 14:49:45 -0400
Subject: [PATCH] switch unlock_mount() to namespace_unlock(), convert all
 umount_tree() callers

which allows to kill the last argument of umount_tree() and make release_mounts()
static.

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