tests: check some common errors

Collect some cases users are hitting when working
with thin-pools which has mismatching kernel metadata content with
lvm2 metadata.

test/shell/thin-errors.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2020 Red Hat, 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 v.2.
+#
+# 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
+
+# Test various error conditions user may hit with thin volumes
+
+SKIP_WITH_LVMLOCKD=1
+SKIP_WITH_LVMPOLLD=1
+
+export LVM_TEST_THIN_REPAIR_CMD=${LVM_TEST_THIN_REPAIR_CMD-/bin/false}
+
+. lib/inittest
+
+#
+# Main
+#
+aux have_thin 1 3 0 || skip
+aux thin_pool_error_works_32 || skip
+
+aux prepare_vg 2
+
+###############################################
+#  Testing failing thin-pool metadata device  #
+###############################################
+
+lvcreate -T -L1M --errorwhenfull y $vg/pool
+lvcreate -V2 -n $lv1 $vg/pool
+lvcreate -s -n $lv2 $vg/$lv1
+
+# Prepare old metadata with transaction_id 2
+vgcfgbackup -f mda_tid_2 $vg
+
+lvcreate -s -n $lv3 $vg/$lv1
+lvcreate -s -n $lv4 $vg/$lv1
+lvcreate -s -n $lv5 $vg/$lv1
+
+vgcfgbackup -f mda_tid_5 $vg
+
+# Restore mismatching old metadata with different transaction_id
+vgcfgrestore -f mda_tid_2 --force --yes $vg
+
+
+not lvcreate -s -n $lv5 $vg/$lv1
+
+sed -e 's/transaction_id = 2/transaction_id = 5/g' mda_tid_2 > mda_tid_2_5
+
+# Restore metadata with matching transaction_id, 
+# but already existing device in kernel, unknown to lvm2
+vgcfgrestore -f mda_tid_2_5 --force --yes $vg
+
+not lvcreate -s -n $lv5 $vg/$lv1
+# can be tried repeatedly
+not lvcreate -s -n $lv5 $vg/$lv1
+
+
+# Restore matching metadata and check all works
+# and no kernel thin device was lost
+vgcfgrestore -f mda_tid_5 --force --yes $vg
+
+lvcreate -s -n $lv6 $vg/$lv1
+
+lvchange -ay -K $vg
+
+check active $vg $lv1
+check active $vg $lv2
+check active $vg $lv3
+check active $vg $lv4
+check active $vg $lv5
+check active $vg $lv6
+
+vgremove -ff $vg