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To: "Grover, Andrew" <andrew.grover@intel.com>
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       linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
       Patrick Mochel <mochel@osdl.org>
Subject: Re: driverfs is not for everything! (was: [PATCH] /proc/scsi/map ) 
In-Reply-To: Message from "Grover, Andrew" <andrew.grover@intel.com> 
   of "Mon, 24 Jun 2002 10:35:53 PDT." <59885C5E3098D511AD690002A5072D3C02AB7F53@orsmsx111.jf.intel.com> 
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Date: Mon, 24 Jun 2002 14:09:13 -0400
From: James Bottomley <James.Bottomley@steeleye.com>
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andrew.grover@intel.com said:
> If a device can be accessed by multiple machines concurrently, it
> should not be in driverfs. 

On that argument, we'll eliminate almost all Fibre Channel devices!

I think the qualification for appearing in driverfs is actually possessing a 
driver.  Therefore, we accept FC and iSCSI.  Things which appear as 
FileSystems are debatable, but not anything which has a real device driver.

> We need a device tree to do PM. If driverfs's PM capabilities are hurt
> because it doesn't stay true to that, then the featureitis has gone
> too far. 

Perhaps it's more a question of whether power management belongs as an every 
unit item in driverfs.  As you say, we get problems where the device is shared 
between multiple computers.

James


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