Re: [fuse-devel] OSS Proxy Jack slave

From: Miklos Szeredi
Date: Thu Jun 10 2010 - 09:28:29 EST

On Thu, 10 Jun 2010, Tejun Heo wrote:
> Hello,
> Nope, it's not required for osspd but it's a rather strong
> limitation on the interface which would be pretty difficult to work
> around later. Page protection tricks would be very cumbersome and
> unscalable. Hmmm, it does remove the necessity for allocating
> kernel pages, right? Still, it seems like a big limitation. Are
> you sure this is a good idea?

I'm sure its a good idea to provide an interface that does't _require_
server side mmaps. This doesn't preclude an mmap interface later on,
but I'd rather start with a "pure" read/write device interface, which
is in a lot of ways simpler to solve than mmap.

As for pinning kernel pages, I still think it's a good idea for the
char device interface, but you're right, it's not necessary.

In fact I'm mostly ready with an implementation of store/retrieve that
just pokes the regular page cache.

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