From mboxrd@z Thu Jan  1 00:00:00 1970
From: Phillip Susi <psusi@cfl.rr.com>
Subject: Re: [PATCH] dm-thinp: new device mapper target to thin
 provision storage
Date: Wed, 29 Sep 2010 09:41:05 -0400
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On 9/29/2010 7:25 AM, Heinz Mauelshagen wrote:
> On Tue, 2010-09-28 at 17:44 -0400, Phillip Susi wrote:
>> How is this different than snapshotting a zero target?
> 
> Like Hanness mentioned: you can free space.

Could you clarify that a bit?  Is space only freed if you reduce the
length of a device?  You can't do the same with a snapshot?