From 70cf49cfc7a4d1eb4aeea6cd128b88230be9d0b1 Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@inktank.com>
Date: Mon, 6 May 2013 17:40:33 -0500
Subject: [PATCH] rbd: ignore zero-overlap parent

An rbd clone image that has an overlap with its parent of 0 is
effectively not a layered image at all.  Detect this case and treat
such an image as non-layered.  Issue a warning to be sure the user
knows what's going on.

This resolves:
    http://tracker.ceph.com/issues/5028

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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