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SubjectRe: [PATCH 5/7] FUSE: implement ioctl support
Tejun Heo wrote:
> Greg KH wrote:
>> Why do we need ioctls? For CUSE? In that case, would we need to copy
>> the memory from userspace, into the kernel, and then back out into
>> userspace again? Can't we just have a "pass-through" type fixed ioctl
>> instead?
> Can you elaborate a bit? How the fixed ioctl would know how much to
> copy in and out and from where?

If you're worried about the double copying due to performance reasons,
what we can do is implementing userspace to userspace copying. I just
took easier path of copying twice as u-u copy can't be done using the
existing FUSE mechanics.


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