Re: [PATCH v9 00/17] fuse: fuse-over-io-uring.

[Pavel Begunkov <asml.silence@gmail.com>]

On 6/18/25 16:30, Keith Busch wrote:
> On Wed, Jun 18, 2025 at 03:13:41PM +0200, Bernd Schubert wrote:
>> On 6/18/25 12:54, xiaobing.li wrote:
>>>
>>> Hi Bernd,
>>>
>>> Do you have any plans to add zero copy solution? We are interested in
>>> FUSE's zero copy solution and conducting research in code.
>>> If you have no plans in this regard for the time being, we intend to
>>>   submit our solution.
>>
>> Hi Xiobing,
>>
>> Keith (add to CC) did some work for that in ublk and also planned to
>> work on that for fuse (or a colleague). Maybe Keith could
>> give an update.
> 
> I was initially asked to implement a similar solution that ublk uses for
> zero-copy, but the requirements changed such that it won't work. The
> ublk server can't directly access the zero-copy buffers. It can only
> indirectly refer to it with an io_ring registered buffer index, which is
> fine my ublk use case, but the fuse server that I was trying to
> enable does in fact need to directly access that data.
> 
> My colleauge had been working a solution, but it required shared memory
> between the application and the fuse server, and therefore cooperation
> between them, which is rather limiting. It's still on his to-do list,
> but I don't think it's a high priority at the moment. If you have
> something in the works, please feel free to share it when you're ready,
> and I would be interested to review.

CC David

-- 
Pavel Begunkov