linux-kernel - Re: [PATCH] NVMe: Add a character device for each nvme device

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Date:	Fri, 27 Jul 2012 16:42:01 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Matthew Wilcox <willy@...ux.intel.com>
CC:	Keith Busch <keith.busch@...el.com>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <greg@...ah.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH] NVMe: Add a character device for each nvme device

On 07/27/2012 04:26 PM, Matthew Wilcox wrote:
> Maybe we should design such a mechanism, but maybe we shouldn't ... as we
> find common things to do, we tend to move those to sysfs, not ioctls,
> and the kinds of commands that are being sent here are essentially
> vendor-specific NVMe commands; it's not clear they'd fit neatly into a
> generic mechanism.

You're delivering arbitrary packets to the device from userspace, and it 
is returning arbitrary packets to userspace.

This is a familiar pattern...  It is quite analagous to "send 
vendor-specific commands from userspace to a drive"

	Jeff


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