[Unionfs] Unionfs 2.0 on 2.6.9 kernel

[Erez Zadok]

In message <46B97EA2.4040806 at psi.ch>, Beyerle Urs writes:
[...]
> Hi, Erez,
> 
> # mount -t unionfs -o dirs=/dir1=rw:/dir2=ro none /mnt/unionfs
> now works and I can work inside /mnt/unionfs.
> I can also do
> 
> # mount -t unionfs -o dirs=/dir1=rw none /mnt/unionfs
> # mount -t unionfs -o remount,ro none /mnt/unionfs
> 
> But I have a problem when adding a new branch:
> 
> # mount -t unionfs -o dirs=/dir1=rw none /mnt/unionfs
> # mount -t unionfs -o remount,add=:/dir2:ro none /mnt/unionfs
> mount: special device none does not exist
> 
> and in messages:
> Aug  8 09:00:19 tux40 kernel: unionfs: error accessing lower directory "/dir2:ro" (error -2)
> 
> If I do
> # mount -t unionfs -o remount,add=:/dir2 none /mnt/unionfs
> 
> I even get a kernel panic:
> 
> Aug  8 10:24:14 tux40 kernel: Unable to handle kernel NULL pointer dereference at virtual 

That sounds pretty simple to fix.  Could you please file a bugzilla report?

Thanks,
Erez.