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SubjectRe: [PATCH 2/2] dasd: remove dynamic ioctl registration
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On Fri, 2005-12-16 at 16:00 +0100, Christoph Hellwig wrote:
> On Fri, Dec 16, 2005 at 03:58:19PM +0100, Martin Schwidefsky wrote:
> > On Fri, 2005-12-16 at 15:33 +0100, Christoph Hellwig wrote:
> > > dasd has some really messy code to allow submodule to register ioctl.
> > > Right now there are two cases: cmd and eckd.
> >
> > Wrong, at least four: cmf, eckd, err, and a binary only module from EMC.
> > Now don't hit me for that binary module. But it has been there for 2.4
> > and we even reserved some ioctl numbers for them (240-255).
>
> NACK, binary modules are not a reason to keep broken things, rather one
> to fix it better sooner than later.

I see your point. We shouldn't have introduced that interface in the
first place but we really wanted to be able to run on EMC with decent
speed.

> > I would be cautious about ripping out the dynamic ioctls interface
> > though. I have no idea if there still is an EMC module for 2.6 or other
> > exploiters. It is an exported interface after all. It is not necessary
> > to break these exploiters intentionally.
>
> Yes, it is. Unrelated modules adding ioctls is a big no-way. Even more
> for binary modules. The EMC code deserves to be broken.

Ok understood, but at least I have warn the EMC people about that change
so that they can send a patch for the dasd driver ..

--
blue skies,
Martin

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH


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