test/shell/snapshot-merge-stack.sh

#!/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