UBUNTU: SAUCE: overlayfs: Enable user namespace mounts for the "overlay" fstype

User namespace mounts were mistakenly only enabled for the
"overlayfs" fstype and not for the "overlay" fstype. This is a
regression in behavior towards userspace from previous Ubuntu
kernels and breaks some features of LXC.

BugLink: http://bugs.launchpad.net/bugs/1478578Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Chris J Arges <chris.j.arges@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

fs/overlayfs/super.c

@@ -1174,6 +1174,7 @@ static struct file_system_type ovl_fs_type = {
 	.name		= "overlay",
 	.mount		= ovl_mount,
 	.kill_sb	= kill_anon_super,
+	.fs_flags	= FS_USERNS_MOUNT,
 };
 MODULE_ALIAS_FS("overlay");