tests: stress: Add multi-threads stress testing for PV/VG/LV

This patch is to add the stress testing, which launches three threads,
one thread is for creating/removing PV, one thread is for
creating/removing VG, and the last one thread is for LV operations.

Signed-off-by: Leo Yan <leo.yan@linaro.org>

test/shell/stress_multi_threads_2.sh

@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2021 Seagate, Inc. All rights reserved.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+SKIP_WITH_LVMPOLLD=1
+
+. lib/inittest
+
+aux prepare_devs 8
+get_devs
+
+pvcreate -M2 "$dev1" "$dev2" "$dev3" "$dev4" "$dev5" "$dev6"
+
+test_vg_thread1()
+{
+	for i in {1..1000}
+	do
+		vgcreate --shared -M2 "$vg1" "$dev1" "$dev2" "$dev3"
+		vgremove -ff $vg1
+	done
+}
+
+test_vg_thread2()
+{
+	vgcreate --shared -M2 "$vg2" "$dev4" "$dev5" "$dev6"
+
+	for i in {1..1000}
+	do
+		# Create new logic volume and deactivate it
+		lvcreate -a n --zero n -l 1 -n foo $vg2
+
+		# Set minor number
+		lvchange $vg2/foo -My --major=255 --minor=124
+
+		# Activate logic volume
+		lvchange $vg2/foo -a y
+
+		# Extend logic volume with 10%
+		lvextend -l+10 $vg2/foo
+
+		# Deactivate logic volume
+		lvchange $vg2/foo -a n
+
+		# Deactivate volume group
+		vgchange $vg2 -a n
+
+		# Activate volume group with shareable mode
+		vgchange $vg2 -a sy
+
+		# lvextend fails due to mismatched lock mode
+		not lvextend -l+10 $vg2/foo
+
+		# Promote volume group to exclusive mode
+		vgchange $vg2 -a ey
+
+		lvreduce -f -l-4 $vg2/foo
+
+		lvchange -an $vg2/foo
+		lvremove $vg2/foo
+	done
+
+	vgremove -ff $vg2
+}
+
+test_vg_thread3()
+{
+	for i in {1..1000}
+	do
+		pvcreate -M2 "$dev7" "$dev8"
+		pvremove "$dev7"
+		pvremove "$dev8"
+	done
+}
+
+test_vg_thread1 &
+WAITPID=$!
+
+test_vg_thread2 &
+WAITPID="$WAITPID "$!
+
+test_vg_thread3 &
+WAITPID="$WAITPID "$!
+
+wait $WAITPID