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.
