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:	Sat, 3 Nov 2012 14:50:52 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, 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)

> > It's not really about the lines of code.  It adds a new userland
> > visible interface.  As for the "long" list of commands, it depends on
> > how you write it but even if it's textually long it's still very
> > simple in terms of actual complexity.
> 
> Sure, but its place is not the kernel.
> 
> As to implementing the ioctl, it's all but trivial.  For one thing, you
> have to make the block device ioctl op take a "struct file".  I have
> been asking Al Viro about it for 6 months and I haven't got any answer yet.

Just do it - if Al cared he'd have replied about it.

> I proposed a way to implement the ultimately flexible solution (BPF) and
> you shot it down because it was too complex.  Alan is showing you with
> multiple examples of why the flexibility would be useful (perhaps nobody
> would use it, but the use cases _are_ there), and you are mostly
> ignoring them.

My feeling too - It feels to me like Tejun is trying to railroad a broken
non-solution into the system without regards for anyone else and by
simply dismissing any other input.

Alan
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