--- etc/rc.d/zfs	2010-01-25 06:27:11.000000000 +0000
+++ etc/rc.d/zfs	2009-04-12 16:59:35.000000000 +0000
@@ -23,6 +23,14 @@
 
 zfs_start_main()
 {
+	# If root is read-only, mount a tmpfs on /zfs to provide
+	#  a writable mountpoint, if not already
+	if [ -d /zfs ] && mount | grep ' on / ' | grep -q 'read-only' && \
+	  ! mount | grep -q ' on /zfs (tmpfs'
+	then
+		mount -t tmpfs -o size=65536 tmpfs /zfs
+	fi
+	
 	zfs mount -a
 	zfs share -a
 	if [ ! -r /etc/zfs/exports ]; then
@@ -50,6 +58,12 @@
 {
 	zfs unshare -a
 	zfs unmount -a
+
+	# If /zfs is a tmpfs, unmount it
+	if mount | grep -q ' on /zfs (tmpfs'
+	then
+		umount -f /zfs
+	fi
 }
 
 zfs_stop()