From e3197d83d6f5b9bd0e57a05592437ffa459ee106 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 16 Mar 2013 14:35:16 -0400
Subject: [PATCH] saner umount_tree()/release_mounts(), part 1

global list of release_mounts() fodder, protected by namespace_sem;
eventually, all umount_tree() callers will use it as kill list.
Helper picking the contents of that list, releasing namespace_sem
and doing release_mounts() on what it got.

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