From: Helg <helg-openbsd@gmx.de>
Subject: Re: fuse: remove ioctl from /dev/fuse0
To: tech@openbsd.org
Cc: jca@wxcvbn.org
Date: Fri, 5 Sep 2025 21:00:15 +0200

On Sun, Sep 07, 2025 at 07:38:28PM +0200, Jeremie Courreges-Anglas wrote:
> On Sun, Sep 07, 2025 at 06:45:35PM +0200, Helg wrote:
> > Cleanup the kernel fuse device code to remove support for ioctl. This
> > is no longer needed since an fbuf is now read or written in one go,
> > rather than a combination of read(2) or write(2) and ioctl(2) to read
> > or write the buffer used by the vfs syscalls read, write, readlink and
> > readdir.
> > 
> > OK?
> 
> Makes sense, but is this code holding you back from further
> improvements?  Or can you keep it in for some time, just for
> compatibility between a new kernel and an old libfuse?
> 
> -- 
> jca

The kernel is no longer compatible with an old libfuse because it now
expects the fusebuf and data to be read and written at the same time.
It's not holding me back so could stay longer, but it's essentially dead
code now. 

helg