Support inheriting properties in channel programs

This adds support in channel programs to inherit properties analogous
to `zfs inherit` by adding `zfs.sync.inherit` and `zfs.check.inherit`
functions to the ZFS LUA API.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Jason King <jason.king@joyent.com>
Closes #9738

tests/runfiles/common.run

@@ -80,7 +80,7 @@ tags = ['functional', 'channel_program', 'lua_core']
 tests = ['tst.destroy_fs', 'tst.destroy_snap', 'tst.get_count_and_limit',
     'tst.get_index_props', 'tst.get_mountpoint', 'tst.get_neg',
     'tst.get_number_props', 'tst.get_string_props', 'tst.get_type',
-    'tst.get_userquota', 'tst.get_written', 'tst.list_bookmarks',
+    'tst.get_userquota', 'tst.get_written', 'tst.inherit', 'tst.list_bookmarks',
     'tst.list_children', 'tst.list_clones', 'tst.list_holds',
     'tst.list_snapshots', 'tst.list_system_props',
     'tst.list_user_props', 'tst.parse_args_neg','tst.promote_conflict',

tests/zfs-tests/tests/functional/channel_program/synctask_core/Makefile.am

@@ -13,6 +13,7 @@ dist_pkgdata_SCRIPTS = \
 	tst.get_type.ksh \
 	tst.get_userquota.ksh \
 	tst.get_written.ksh \
+	tst.inherit.ksh \
 	tst.list_bookmarks.ksh \
 	tst.list_children.ksh \
 	tst.list_clones.ksh \

tests/zfs-tests/tests/functional/channel_program/synctask_core/tst.inherit.ksh

@@ -0,0 +1,39 @@
+#!/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 2020 Joyent, Inc.
+#
+
+. $STF_SUITE/tests/functional/channel_program/channel_common.kshlib
+
+verify_runnable "global"
+
+fs=$TESTPOOL/$TESTFS
+testprop="com.joyent:testprop"
+testval="testval"
+
+log_must dataset_setprop $fs $testprop $testval
+log_must_program_sync $TESTPOOL - $fs $testprop <<-EOF
+	arg = ...
+	fs = arg["argv"][1]
+	prop = arg["argv"][2]
+	err = zfs.sync.inherit(fs, prop)
+	msg = "resetting " .. prop .. " on " .. fs .. " err=" .. err
+	return msg
+EOF
+
+
+prop=$(get_prop $testprop $fs)
+[[ "$prop" == "-" ]] || log_fail "Property still set after inheriting"
+
+log_pass "Inherit/clear property with channel program works."