From ab508822cab4c84f07373cd6ad107a1fd1362831 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@suse.cz>
Date: Sat, 13 Dec 2014 00:59:49 +0100
Subject: [PATCH] ovl: improve mount helpers

Move common checks into ovl_mount_dir() helper.

Create helper for looking up lower directories.

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