tests: stacked snapshot merge

test/shell/snapshot-merge-stack.sh

@@ -0,0 +1,85 @@
+#!/bin/sh
+# Copyright (C) 2016 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
+
+# Exercise snapshot merge also when stacked
+
+SKIP_WITH_LVMLOCKD=1
+export LVM_TEST_THIN_REPAIR_CMD=${LVM_TEST_THIN_REPAIR_CMD-/bin/false}
+
+. lib/inittest
+
+which mkfs.ext3 || skip
+
+aux target_at_least dm-snapshot-merge 1 0 0 || skip
+
+aux prepare_vg 2 100
+
+snap_and_merge() {
+	lvcreate -s -n $lv2 -L20 $vg/$lv1 "$dev2"
+	#dd if=/dev/zero of="$DM_DEV_DIR/$vg/$lv1" bs=1M count=10 conv=fdatasync
+	mkfs.ext3 "$DM_DEV_DIR/$vg/$lv2"
+	sync
+	lvs -a $vg
+
+	# keep device open to prevent instant merge
+	sleep 20 < "$DM_DEV_DIR/$vg/$lv1" &
+	SLEEP_PID=$!
+
+	# initiate background merge
+	lvconvert -b --merge $vg/$lv2
+
+	lvs -a -o+lv_merging,lv_merge_failed $vg
+	kill $SLEEP_PID
+
+	aux delay_dev "$dev1"  0 200 $(get first_extent_sector "$dev1"):
+	lvchange --refresh $vg/$lv1
+	dmsetup table
+	lvs -a -o+lv_merging,lv_merge_failed $vg
+	sleep 1
+	check lv_attr_bit state $vg/$lv1 "a"
+	check lv_attr_bit state $vg/$lv2 "a"
+	aux error_dev "$dev2" $(get first_extent_sector "$dev2"):
+	# delay to let snapshot merge 'discover' failing COW device
+	sleep 1
+	sync
+	dmsetup status
+	lvs -a -o+lv_merging,lv_merge_failed $vg
+	check lv_attr_bit state $vg/$lv1 "m"
+	check lv_attr_bit state $vg/$lv2 "m"
+
+	# device OK and running in full speed
+	aux enable_dev "$dev1" "$dev2"
+
+	# reactivate so merge can finish
+	lvchange -an $vg
+	lvchange -ay $vg
+	sleep 1
+	lvs -a -o+lv_merging,lv_merge_failed $vg
+	check lv_not_exists $vg $lv2
+	fsck -n "$DM_DEV_DIR/$vg/$lv1"
+
+	lvremove -f $vg
+}
+
+
+# First check merge on plain linear LV
+lvcreate -aey -L50 -n $lv1 $vg "$dev1"
+snap_and_merge
+
+# When available check merge of old snapshot with Thin LV being origin
+if aux have_thin 1 0 0 ; then
+	lvcreate -T -L10 -V50 -n $lv1 $vg/pool "$dev1"
+	snap_and_merge
+fi
+
+# TODO snapshot merge with Mirror, Raid, Cache...
+
+vgremove -f $vg