The problem is that FUSE2 is the latest version of FUSE that is supported across all platforms that cgofuse supports.

Only Linux and Windows/WinFsp have support for FUSE3. Which platform are you interested in?

Linux > Window > Mac. Eventually we will have all three platforms.

macOS does not support the FUSE3 API.

another question which is not related to fuse version. I am trying to understand how the application user space open call gets hook into fuse open method. I looked at kernal, it's using vfs_open which in term will send msg to the queue and the msg will be picked up by user space open method. I wrote a test problem to have concurrent 50 threads to open the SAME file, however I only noticed the fuse open call only got called once. I am wondering why it's not called 50 times for each thread. I looked at linux kernel, it doesn't seem there is any lock to prevent that.

@billziss-gh FUSE2 is EOL. I would be really interested in a fuse3 port.

What could decide you to port it? I can't help you with C, how about sponsoring it?

@ghz-gehtz

FUSE2 is the only cross-platform user-mode file system layer today. Even on Linux many distros did not include FUSE3 until recently.

I agree that the porting work to FUSE3 will have to be done eventually, even if it is only for Linux. The work should be done in such a way as to support both old (FUSE2) and new (FUSE3) distros. Even more importantly, the work should be done in a way as to not disrupt other (non-Linux) platforms.

This makes the work non-trivial and time-consuming.

In any case if you are serious about sponsoring such an effort, you can contact me directly: billziss at navimatics dot com. Please do note that I apply commercial development rates for commissioned work.

Hi @billziss-gh,

Did you get any chance to work on this? Would it help to setup some sort of crowdfunded bounty for this?

I also did find this recently, in case it helps in anyway: https://github.com/Azure/azure-storage-fuse/tree/main/component/libfuse

@darthShadow I have not had the chance to look into FUSE3 support for cgofuse.

Has the adoption of FUSE3 on Linux distros reached the point where it makes this support necessary?

In ubuntu 22.04, fuse2 can be installed but a lot of things seem to break:
https://askubuntu.com/a/1412529

https://github.com/AppImage/AppImageKit/wiki/FUSE#install-fuse

The latest version of libfuse 2 is from 2019 and there will be none after.

It looks like we may have to update cgofuse to support FUSE3 on Linux. Ideally this should be done in a manner transparent to users of this package and it should support both FUSE2 and FUSE3 at runtime (whichever is present).

I am currently very busy, so if anyone wants to try this I can provide some guidance. Otherwise, it may be at least a few weeks (and possibly months) before I have the time to look into it myself.

Yeah, fuse2 doesn't work very well but libfuse2 still works fine so rclone linked via cgofuse works fine too.

Any idea on the schedule on this?

@billziss-gh Have you had a chance to take a look at this?