Re: [PATCH 11/11] compat_ioctl: move tape handling into drivers

[Al Viro]

On Sat, Sep 08, 2018 at 04:28:17PM +0200, Arnd Bergmann wrote:
> MTIOCPOS and MTIOCGET are incompatible between 32-bit and 64-bit user
> space, and traditionally have been translated in fs/compat_ioctl.c.
> 
> To get rid of that translation handler, move a corresponding
> implementation into each of the four drivers implementing those commands.
> 
> The interesting part of that is now in a new linux/mtio.h header that
> wraps the existing uapi/linux/mtio.h header and provides an abstraction
> to let drivers handle both cases easily.

Ugh...  Frankly, this bool compat passed all way down looks wrong.
I can live with that; the question is whether block folks will be
OK with that thing...