From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <greg@kroah.com>
Date: Wed, 02 Jul 2008 15:56:31 +0000
Subject: Re: not all volume types export UUIDs (was: /dev/disk/by-id
Message-Id: <20080702155631.GA2372@kroah.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <20080702102820.GB16076@piper.oerlikon.madduck.net>
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To: linux-hotplug@vger.kernel.org

On Wed, Jul 02, 2008 at 05:49:32PM +0200, martin f krafft wrote:
> also sprach Kay Sievers <kay.sievers@vrfy.org> [2008.07.02.1619 +0200]:
> > What kind of id's do you have in mind, which would be the same across
> > buses?
> 
> I don't. I am trying to understand why the bus type is an integral
> part of the /dev/disk/by-id/* links.

Because UUIDs are not guaranteed to be unique, except by bus type.  So
if you place them all in the same namespace, you need to add the bus
type to ensure there are no collisions.

thanks,

greg k-h