Re: [RFD w/info-PATCH] device arguments from lookup, partion code

[Alan Cox]

> Sure. But we have to do two syscalls only if ioctl has both in- and out-
> arguments that way. Moreover, we are talking about non-trivial in- arguments.
> How many of these are in hotspots?

There is also a second question. How do you ensure the read is for the right 
data when you are sharing a file handle with another thread..

ioctl() has the nice property that an in/out ioctl is implicitly synchronized

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