Re: Re: [PATCH] fuse: add fusex filesystem

[Horst Birthelmer <horst@birthelmer.de>]

On Tue, May 12, 2026 at 10:11:16AM +0200, Miklos Szeredi wrote:
> On Thu, 7 May 2026 at 10:37, Horst Birthelmer <horst@birthelmer.de> wrote:
> 
> > Where do you see the biggest challenge for this. To me, it doesn't look impossible to add that,
> > but I'm sure I'm missing a lot in this context.
> 
> The biggest challenge I see is API design.  I'd really like to have a
> simple and consistent API for this.

OK, that is a valid goal, I guess.

I have tried to come up with a fusex 'module' that does all operations over
io-uring since it is a lot easier to just support one way of transport.

Then I have written a very primitive passthrough to test the user space
interface and I can get it to work with some small changes to the interface
mostly due to the small header space on the ring.

I have done this to check how fast I can have something workable with the 
new interface since I'm supposed to add compound commands.

Do you think it is worth pursuing further?

> 
> First task: need to document the current interface, which is long
> overdue.  Here's a start:
> 
> https://docs.google.com/document/d/1SInG6nc5dF-db3WtCqFOnRDCY1jRl5JQ0Toiryn2PRc/edit?usp=sharing
> 
> This needs refinement, i.e. try to document by cache type, how is the
> cache used, invalidated, etc.
> 
> Thanks,
> Miklos