Add tests for forcibly unmount filesystem while receiving stream.

Signed-off-by: Mariusz Zaborski <oshogbo@vexillium.org>

tests/runfiles/common.run

@@ -208,9 +208,10 @@ tests = ['zfs_receive_001_pos', 'zfs_receive_002_pos', 'zfs_receive_003_pos',
     'zfs_receive_007_neg', 'zfs_receive_008_pos', 'zfs_receive_009_neg',
     'zfs_receive_010_pos', 'zfs_receive_011_pos', 'zfs_receive_012_pos',
     'zfs_receive_013_pos', 'zfs_receive_014_pos', 'zfs_receive_015_pos',
-    'receive-o-x_props_override', 'zfs_receive_from_encrypted',
-    'zfs_receive_to_encrypted', 'zfs_receive_raw',
-    'zfs_receive_raw_incremental', 'zfs_receive_-e', 'zfs_receive_raw_-d']
+    'zfs_receive_016_pos', 'receive-o-x_props_override',
+    'zfs_receive_from_encrypted', 'zfs_receive_to_encrypted',
+    'zfs_receive_raw', 'zfs_receive_raw_incremental', 'zfs_receive_-e',
+    'zfs_receive_raw_-d']
 tags = ['functional', 'cli_root', 'zfs_receive']
 
 [tests/functional/cli_root/zfs_rename]

tests/zfs-tests/tests/functional/cli_root/zfs_receive/Makefile.am

@@ -17,6 +17,7 @@ dist_pkgdata_SCRIPTS = \
 	zfs_receive_013_pos.ksh \
 	zfs_receive_014_pos.ksh \
 	zfs_receive_015_pos.ksh \
+	zfs_receive_016_pos.ksh \
 	receive-o-x_props_override.ksh \
 	zfs_receive_from_encrypted.ksh \
 	zfs_receive_to_encrypted.ksh \

tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_016_pos.ksh

@@ -0,0 +1,85 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# 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.
+#
+# CDDL HEADER END
+#
+# Copyright (c) 2020 by Mariusz Zaborski <oshogbo@FreeBSD.org>.
+
+#
+# DESCRIPTION:
+# Verify 'zfs recv' can forcibly unmount filesystem while receiving
+# stream.
+#
+# STRATEGY:
+# 1. Create snapshot of file system
+# 2. Make a zfs filesystem mountpoint busy
+# 3. Receive filesystem with force flag.
+# 4. Verify that stream was received or failed on Linux.
+#
+
+. $STF_SUITE/tests/functional/cli_root/cli_common.kshlib
+
+verify_runnable "both"
+
+function cleanup
+{
+	cd $curpath
+
+	for snap in $init_snap $rst_snap; do
+                snapexists $snap && \
+                        destroy_snapshot $snap
+        done
+
+	datasetexists $rst_root && \
+		destroy_dataset $rst_root
+
+	for file in $full_bkup
+	do
+		[[ -e $file ]] && \
+			log_must rm -f $file
+	done
+
+	[[ -d $TESTDIR1 ]] && \
+		log_must rm -rf $TESTDIR1
+}
+
+log_assert "Verify 'zfs recv' can forcibly unmount busy filesystem."
+log_onexit cleanup
+
+curpath=`dirname $0`
+init_snap=$TESTPOOL/$TESTFS@init_snap
+full_bkup=$TEST_BASE_DIR/fullbkup.$$
+rst_root=$TESTPOOL/rst_ctr
+rst_snap=$rst_root@init_snap
+
+log_note "Verify 'zfs recv' can forcible unmount busy filesystem."
+
+# Preparation
+log_must zfs create $rst_root
+[[ ! -d $TESTDIR1 ]] && \
+	log_must mkdir -p $TESTDIR1
+log_must zfs set mountpoint=$TESTDIR1 $rst_root
+
+log_must zfs snapshot $init_snap
+log_must eval "zfs send $init_snap > $full_bkup"
+
+# Test
+log_must cd $TESTDIR1
+if is_linux; then
+    # Linux does not support it.
+    log_mustnot zfs receive -MF $rst_snap < $full_bkup
+else
+    log_must zfs receive -MF $rst_snap < $full_bkup
+fi
+
+log_pass "The busy filesystem was unmounted or busy as expected."