linux-kernel - Re: setting up CDB filters in udev (was Re: [PATCH v2 0/3] block: add queue-private command filter, editable via sysfs)

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Date:	Mon, 5 Nov 2012 20:17:54 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Tejun Heo <tj@...nel.org>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Ric Wheeler <rwheeler@...hat.com>,
	Petr Matousek <pmatouse@...hat.com>,
	Kay Sievers <kay@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Subject: Re: setting up CDB filters in udev (was Re: [PATCH v2 0/3] block:
 add queue-private command filter, editable via sysfs)

On Mon, 5 Nov 2012 12:09:55 -0800
Tejun Heo <tj@...nel.org> wrote:

> Hey, Alan.
> 
> On Mon, Nov 05, 2012 at 08:12:08PM +0000, Alan Cox wrote:
> > There are two sensible choices here IMHO
> > 
> > - The simple sysctl
> > 
> > - Doing the job right
> > 
> > A half way solution such as that you are proposing seems to me to achieve
> > nothing other than guaranteeing we'll have another pile of useless crap
> > to maintain forever as ABI.
> 
> I'm all for simple.  Just throw in a sysfs binary switch to allow all
> SG_IO for a given block device for users w/ write access.  I'd be
> completely happy with that.

IMHO that's the best option for now - if it fixes the specific case of
concern right now. It's a trivial interface, it's trivial security (need
to check CAP_SYS_RAWIO to flip) and it means that the job can be done
properly when there is consensus without a whole extra legacy API stuck
behind.

Alan
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