From 7c37fbda85ceb9be7bdb9d5f53e702efc40cf783 Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Fri, 24 Oct 2014 00:14:39 +0200
Subject: [PATCH] overlay: overlay filesystem documentation

Document the overlay filesystem.

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