From 5ef88da56a77bfb3b9631f5e5775f3bff86b6219 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@suse.cz>
Date: Sat, 13 Dec 2014 00:59:43 +0100
Subject: [PATCH] ovl: helper to iterate layers

Add helper to iterate through all the layers, starting from the upper layer
(if exists) and continuing down through the lower layers.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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