Re: strange behaviour with p9fs vs zfs

On Jul 21, 2025, at 10:07 PM, Lexi Winter <ivy@freebsd.org> wrote:
> 
> hello,
> 
> i've noticed some odd behaviour in p9fs that might be a bug.  this is on
> main ~29af6d2e2ec9fe8df7cf1e1a0bf3597028831b18 on amd64.
> 
> on the host, i have a basic ZFS hierarchy:
> 
> # zfs list -r zroot/p9test
> NAME             USED  AVAIL  REFER  MOUNTPOINT
> zroot/p9test     400K   682G   112K  /zroot/p9test
> zroot/p9test/a    96K   682G    96K  /zroot/p9test/a
> zroot/p9test/b    96K   682G    96K  /zroot/p9test/b
> zroot/p9test/c    96K   682G    96K  /zroot/p9test/c
> 
> this is exported to the VM via bhyve -s 6:0,virtio-9p,p9test=/zroot/p9test,ro
> 
> inside the VM, i can mount the filesystem:
> 
> # mount -tp9fs p9test /mnt
> 
> however, while the top-level directory looks fine, all the descendent
> mountpoints appear to be copies of the top-level directory:
> 
> # ls -i /mnt
> 34 a 34 b 34 c
> # ls -i /mnt/a
> 34 a 34 b 34 c
> # ls -i /mnt/a/a
> 34 a 34 b 34 c
> # ls -i /mnt/a/a/b
> 34 a 34 b 34 c
> # ls -i /mnt/a/a/b/a
> 34 a 34 b 34 c
> 
> i would expect them to either appear empty (unhelpful, but at least
> correct) or else for p9fs to traverse into the descentent filesystem
> (much more helpful).

I don't see that (I mounted host's /usr/src and everything appears
as it should).
Host:	14.3-STABLE stable/14-n271998-6e211ff4902a
VM:	15.0-CURRENT #327 main-n278933-cc413e2c04f0

Though there are other bugs...