clean up /dev/zvol/

[Christopher Harrison]

/dev/zvol does not appear to be cleaning up the device tree of zfs and 
zfs snapshots.   After zfs snapshots of a zfs volume have been deleted 
the device remains in the device tree.

My /dev/zvol grows very large, quickly on my system taking multiple 
snapshots a day of multiple volumes.   Does anyone have any ideas to 
clean up the /dev/zvol device tree?


Thanks in advance,
     -C