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SubjectRe: [PATCH 5/7] FUSE: implement ioctl support
Tejun Heo wrote:
> ioctl support is tricky to implement because only the ioctl
> implementation itself knows which memory regions need to be read
> and/or written. To support this, fuse client can request retry of
> ioctl specifying memory regions to read and write. Deep copying
> (nested pointers) can be implemented by retrying multiple times
> resolving one depth of dereference at a time.

Okay, I'm going to say it... wouldn't it be better to have some kind of
data structure description language which the userspace can register
with the kernel to linearize the data on a per-ioctl basis (kind of like


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