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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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