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diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/reservation/reservation_022_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/reservation/reservation_022_pos.ksh
new file mode 100755
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+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/reservation/reservation_022_pos.ksh
@@ -0,0 +1,82 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2018 Joyent, Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/reservation/reservation.shlib
+
+#
+# DESCRIPTION:
+#
+# Cloning a volume with -o refreservation=auto creates a thick provisioned
+# volume
+#
+# STRATEGY:
+# 1) Create a sparse volume.
+# 2) Snapshot and clone it, using clone -o refreservation=auto.
+# 3) Verify that the clone has refreservation that matches the size predicted by
+#    volsize_to_reservation().
+# 4) Snapshot this second volume and clone it, using clone -o
+#    refreservation=auto.
+# 5) Verify that the second clone has refreservation that matches the size
+#    predicted by volsize_to_reservation().
+#
+
+verify_runnable "global"
+
+function cleanup
+{
+	# Destroy first vol and descendants in one go.
+	destroy_dataset "$TESTPOOL/$TESTVOL" "-Rf"
+}
+
+log_onexit cleanup
+
+log_assert "Cloning a volume with -o refreservation=auto creates a thick" \
+    "provisioned volume"
+
+space_avail=$(get_prop available $TESTPOOL)
+(( vol_size = (space_avail / 4) & ~(1024 * 1024 - 1) ))
+
+vol=$TESTPOOL/$TESTVOL
+vol2=$TESTPOOL/$TESTVOL2
+vol3=$TESTPOOL/$TESTVOL2-again
+
+# Create sparse vol and verify
+log_must zfs create -s -V $vol_size $vol
+resv=$(get_prop refreservation $vol)
+log_must test $resv -eq 0
+
+# Clone it
+snap=$vol@clone
+log_must zfs snapshot $snap
+log_must zfs clone -o refreservation=auto $snap $vol2
+
+# Verify it is thick provisioned
+resv=$(get_prop refreservation $vol2)
+expected=$(volsize_to_reservation $vol2 $vol_size)
+log_must test $resv -eq $expected
+
+# Clone the thick provisioned volume
+snap=$vol2@clone
+log_must zfs snapshot $snap
+log_must zfs clone -o refreservation=auto $snap $vol3
+
+# Verify new newest clone is also thick provisioned
+resv=$(get_prop refreservation $vol3)
+expected=$(volsize_to_reservation $vol3 $vol_size)
+log_must test $resv -eq $expected
+
+log_pass "Cloning a thick provisioned volume results in a sparse volume"