Re: [PATCH 4/4] ->compat_ioctl for 390 tape_char

[Christoph Hellwig <hch@lst.de>]

On Sat, Nov 05, 2005 at 12:10:46AM +0100, Arnd Bergmann wrote:
> Hmm, isn't ->compat_ioctl called before the translation lookup?

Yes.

> If so,
> this code would return -EINVAL from tape_34xx_ioctl and result in never
> entering the conversion for MTIO* at all.

we return -ENOIOCTLCMD if we didn't have a valid compat ioctl, and in
that case the vfs code will try to find it in the core translation
table.

> BTW, I now have a set of 25 patches that moves all handlers from
> fs/compat_ioctl.c over to the respective drivers and subsystems,
> but I'm not sure how to best test that.
> I intend to at least give it a test run on my Opteron for the whatever
> ioctls I normally use, but the rest is just guesswork. Christoph,
> can you review those patches?

I'm not sure moving everything from fs/compat_ioctl.c is a good idea.
Everything that is just in a single driver or subsystem that has
common ioctl code - sure.  else it doesn't make a lot of sense.