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	Mon, 5 May 2014 09:54:48 -0400
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Date: Mon, 5 May 2014 09:54:25 -0400
From: Chris Mason <clm@fb.com>
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To: Marc MERLIN <marc@merlins.org>, <linux-btrfs@vger.kernel.org>
Subject: Re: Using mount -o bind vs mount -o subvol=vol
References: <20140504004732.GE9061@merlins.org>
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On 05/03/2014 08:47 PM, Marc MERLIN wrote:
> Is there any functional difference between
>
> mount -o subvol=usr /dev/sda1 /usr
> and
> mount /dev/sda1 /mnt/btrfs_pool
> mount -o bind /mnt/btrfs_pool/usr /usr

The internal implementation of mount -o subvol is a bind mount.  The 
only real difference is having /mnt/btrfs_pool hanging around.

-chris