A collegue fo mine had the problem that it was possible to
vnconfig -u a vn device that was currently in use. This strikes
me as odd.
When looking through the da device code, I notice a similar problem.
Suppose I have a zip fdisk mounted with a disklabel and 2
ufs partitions on it. When I mount both partitions, the disk
will be locked. But it will be unlocked at the first unmount.
I guess there should be a refcounter that keeps track of
the amount of opens and only unlock devices at the last close.
Same for vn.c.
Any comments?
-Guido
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