Re: f_ops flag to speed up compatible ioctls in linux kernel

[Roland Dreier]

    Roland> Yes, this is exactly right.  One issue raised by this
    Roland> thread is that the ioctl32 compatibility code only allows
    Roland> one compatibility handler per ioctl number.  It seems that
    Roland> this creates all sorts of possibilities for mayhem because
    Roland> it makes the ioctl namespace global in scope in some
    Roland> situations.  Does anyone have any thoughts on if/how this
    Roland> should be addressed?

    Michael> Thats what my original patch attempts to address
    Michael> http://www.uwsg.indiana.edu/hypermail/linux/kernel/0409.0/0025.html
    Michael> What do you think?

That patch seems somewhat orthogonal to the issue I raised.  You're
just fixing the problem for devices that don't use the ioctl32 compat
layer.

 - Roland
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