odd zfs behaviour on reboot

[Pete French]

O.K., even odder - it seems that something is creating a real '/tank'
directory in '/' for some reaosn, but not mounting the filesystems onto
it. when I reboot I get this:

	# zpool status
	  pool: tank
	 state: ONLINE
	 scrub: none requested
	config:

		NAME             STATE     READ WRITE CKSUM
		tank             ONLINE       0     0     0
		  label/zfstest  ONLINE       0     0     0

	errors: No known data errors
	# zfs list
	NAME         USED  AVAIL  REFER  MOUNTPOINT
	tank         134K  29.3G  21.5K  /tank
	tank/newfs  18.5K  29.3G  18.5K  /tank/newfs

but nothing is actually mouunted. a quick 'zpool export tank' followed by
a 'zpool import tank' fixes this, but surely it should either mount
them at boot or not ,ount them at boot ? saying they are mounted when
they actuall arent seems wrong...

-pete.