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    SubjectRe: [PATCH 5/7] FUSE: implement ioctl support
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    On Thu, 28 Aug 2008, H. Peter Anvin wrote:
    > This is *hard* to get right, and we screw this up in the kernel with
    > painful regularity. The throught of having user-space processes, which
    > don't have access to the kernel locking primitives and functions like
    > copy_from_user() dealing with this stuff scares me crazy.

    What issues exactly are you thinking of?

    > That is why I'm suggesting using an in-kernel linearizer.

    Lots of complexity, ugh... Even Tejun's current scheme is better IMO.

    Miklos



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