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Subject: Re: [virtio-dev] [PATCH v3 0/2] virtio-fs: add virtio file system device


On Tue, Jun 18, 2019 at 09:30:54PM -0400, Michael S. Tsirkin wrote:
> On Wed, Feb 20, 2019 at 12:46:11PM +0000, Stefan Hajnoczi wrote:
> > v3:
> >  * Remove notifications virtqueue, it's unimplemented and can be added when
> >    needed [Miklos]
> >  * Add Security Considerations and Live Migration Considerations sections
> >    [Michael]
> > v2:
> >  * Clean up core virtio file system device spec
> >  * Add DAX window
> > 
> > These patches add the virtio file system device, which is based on Linux FUSE
> > but includes the DAX window extension.  Similar to virtio-scsi, which
> > transports SCSI commands, virtio-fs transports FUSE requests and the protocol
> > documentation is not duplicated here.
> 
> I think I prefer virtio-fuse as a name. Let's be a bit more
> specific: we might want to add more filesystem devices later on.

virtio-fs is not FUSE.  Existing FUSE file system daemons cannot be
used.

It would be confusing to call it FUSE.  The wire protocol is indeed
based on FUSE but from a user perspective it's a completely different
system.

The virtio-fs device extends the FUSE protocol with the
virtualization-specific DAX window (and the in-development shared
metadata versioning data structures that will be added to a future
spec).

Finally, users are likely to be confused and associate virtio-fuse with
outdated FUSE issues that have long since been solved.  virtio-fs
performs really well and that's not something that people associate with
FUSE :-).

For these reasons I think we should continue to call it virtio-fs.

Stefan

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