Index: head/libexec/rc/rc.d/growfs
===================================================================
--- head/libexec/rc/rc.d/growfs	(revision 343917)
+++ head/libexec/rc/rc.d/growfs	(revision 343918)
@@ -1,98 +1,118 @@
 #!/bin/sh
 #
 # Copyright 2014 John-Mark Gurney
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1. Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 # SUCH DAMAGE.
 #
 # $FreeBSD$
 #
 
 # PROVIDE: growfs
 # BEFORE: sysctl
 # KEYWORD: firstboot
 
 # This allows us to distribute a image
 # and have it work on essentially any size drive.
 #
 # TODO: Figure out where this should really be ordered.
 # I suspect it should go just after fsck but before mountcritlocal.
 # 
 
 . /etc/rc.subr
 
 name="growfs"
 desc="Grow root partition to fill device"
 start_cmd="growfs_start"
 stop_cmd=":"
 rcvar="growfs_enable"
 
 growfs_start ()
 {
 	echo "Growing root partition to fill device"
-	rootdev=$(df / | tail -n 1 | awk '{ sub("/dev/", "", $1); print $1 }')
+	FSTYPE=$(mount -p | awk '{ if ( $2 == "/") { print $3 }}')
+	FSDEV=$(mount -p | awk '{ if ( $2 == "/") { print $1 }}')
+	case "$FSTYPE" in
+	ufs)
+		rootdev=${FSDEV#/dev/}
+		;;
+	zfs)
+		pool=${FSDEV%%/*}
+		rootdev=$(zpool list -v $pool | tail -n 1 | awk '{ print $1 }')
+		;;
+	*)
+		echo "Don't know how to grow root filesystem type: $FSTYPE"
+		return
+	esac
 	if [ x"$rootdev" = x"${rootdev%/*}" ]; then
 		# raw device
 		rawdev="$rootdev"
 	else
 		rawdev=$(glabel status | awk '$1 == "'"$rootdev"'" { print $3 }')
 		if [ x"$rawdev" = x"" ]; then
 			echo "Can't figure out device for: $rootdev"
 			return
 		fi
 	fi
 
 	sysctl -b kern.geom.conftxt | awk '
 {
 	lvl=$1
 	device[lvl] = $3
 	type[lvl] = $2
 	idx[lvl] = $7
 	parttype[lvl] = $13
 	if (dev == $3) {
 		for (i = 1; i <= lvl; i++) {
 			# resize
 			if (type[i] == "PART") {
 				pdev = device[i - 1]
 				cmd[i] = "gpart resize -i " idx[i] " " pdev
 				if (parttype[i] == "GPT")
 					cmd[i] = "gpart recover " pdev " ; " cmd[i]
 			} else if (type[i] == "LABEL") {
 				continue
 			} else {
 				print "unhandled type: " type[i]
 				exit 1
 			}
 		}
 		for (i = 1; i <= lvl; i++) {
 			if (cmd[i])
 				system(cmd[i])
 		}
 		exit 0
 	}
 }' dev="$rawdev"
 	gpart commit "$rootdev"
-	growfs -y /dev/"$rootdev"
+	case "$FSTYPE" in
+	ufs)
+		growfs -y /dev/"$rootdev"
+		;;
+	zfs)
+		zpool online -e $pool $rootdev
+		;;
+	esac
 }
 
 load_rc_config $name
 run_rc_command "$1"