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    SubjectRe: [PATCH 5/7] FUSE: implement ioctl support
    Greg KH wrote:
    > No, I'm not worried about the performance, just that this should be
    > simple as we can just pass "arg" to userspace without touching it as it
    > just came from userspace, right?

    For simple ones, that's how it's gonna be handled. Those copying in and
    out kicks in when the @arg is pointer or worse data structure which can
    contain pointers.

    > Oh wait, there are process space issues at play here that I'm totally
    > forgetting about, right?




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