Re: [RFC v1] USB: core: add USBDEVFS_REVOKE ioctl

[Bastien Nocera <hadess@hadess.net>]

On Thu, 2022-04-28 at 12:28 +0200, Oliver Neukum wrote:
> 
> 
> On 26.04.22 12:37, Bastien Nocera wrote:
> > 
> > I don't think anyone wants to implement path based syscalls,
> > and again,
> > it's equivalent to remote closing the fd, not to disabling the
> > access
> > to the device:
> > "If the file is a special file for a device which is open, the
> > device
> > close function is called as if all open references to the file had
> > been
> > closed."
> OK, so do we still have a need to discuss this specifically to usbfs?
> I suppose if you put this into VFS, you will need a hook to map the
> syscall to drivers that need to handling ioctl() having effects
> beyond
> their syscall abstractly speaking.

I'm afraid that I don't have any intentions on working on this feature
at the vfs level. As I already mentioned, I think that the semantics
are too different to make sense at that level.

I'm instead investigating having an ioctl-less BPF interface, with the
help of Benjamin and Peter.