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

[Michael S. Tsirkin]

Hello!
Quoting r. Roland Dreier (roland@xxxxxxxxxxx) "Re: f_ops flag to speed up compatible ioctls in linux kernel":
>     Albert> Per-command parameters included?
> 
>     Albert> People really do want private syscalls. An ioctl is that,
>     Albert> in a namespace defined by the file descriptor. So ioctl()
>     Albert> provides local scope to something that would otherwise be
>     Albert> global.
> 
> Yes, this is exactly right.  One issue raised by this thread is that
> the ioctl32 compatibility code only allows one compatibility handler
> per ioctl number.  It seems that this creates all sorts of
> possibilities for mayhem because it makes the ioctl namespace global
> in scope in some situations.  Does anyone have any thoughts on if/how
> this should be addressed.
> 

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

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