From mboxrd@z Thu Jan  1 00:00:00 1970
From: bbsposters <bbsposters@yahoo.com.tw>
Subject: Could I create volumes on one device ?
Date: Thu, 13 Oct 2011 00:51:09 +0800 (CST)
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To: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
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Hi list,
I want to create volumes (not subvolumes) on one device.
Could it work?
If it works, how can I do by btrfs tools ?
If it can't, is there any way to create subvolumes which have their independent space? 
For example, I want to create 100MB for /home and 50 MB for /root.
thanks,