Re: [PATCH] Support compat_ioctl for block devices

[Andi Kleen <ak@muc.de>]

On Tue, Jan 18, 2005 at 09:36:45AM +0000, Christoph Hellwig wrote:
> On Tue, Jan 18, 2005 at 10:31:58AM +0100, Andi Kleen wrote:
> > >  - please don't introduce a new API with the BKL held.
> > 
> > Nope, I'm not going to audit zillions of low level functions for this.
> 
> So just stick a lock_kernel() unlock_kernel() into the handler, it's
> not like there's more than a handfull of them.

Hmm, possible, although it tends to be quite ugly (requiring
either gotos or wrappers). But ok.

> 
> > >  - prototype isn't nice.  just passing the gendisk for block_device
> > >    should be enough.
> > 
> > No, it isn't, the compat handler needs cmd and arg, and file is useful
> > when you pass it to an existing ioctl handler.
> 
> cmd/arg is needed, file shouldn't.  If you care for the underlying handler
> add a version that doesn't take the file * either.

Sorry, that didn't make any sense.  

-Andi