lvm2/test/shell/lvextend-caches.sh

#!/usr/bin/env bash

# Copyright (C) 2017-2020 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

SKIP_WITH_LVMPOLLD=1

# lvextend LV with cache|writecache

. lib/inittest

do_test()
{
	# create some initial data
	lvchange -ay $vg/$lv1
	mkfs.xfs -f -s size=4096 "$DM_DEV_DIR/$vg/$lv1"
	mount "$DM_DEV_DIR/$vg/$lv1" "$mount_dir"
	cp pattern "$mount_dir/pattern1"
	dd if=/dev/urandom of="$mount_dir/rand100M" bs=1M count=100 conv=fdatasync
	cp pattern "$mount_dir/pattern2"

	# extend while mounted
	lvextend -L+64M $vg/$lv1 "$dev4"
	lvs -a $vg -o+devices

	# verify initial data
	diff pattern "$mount_dir/pattern1"
	diff pattern "$mount_dir/pattern2"
	dd of=/dev/null if="$mount_dir/rand100M" bs=1M count=100

	# add more data
	cp pattern "$mount_dir/pattern3"
	dd if=/dev/urandom of="$mount_dir/rand8M" bs=1M count=8 conv=fdatasync

	# restart the LV
	umount "$mount_dir"
	lvchange -an $vg/$lv1
	lvchange -ay $vg/$lv1
	mount "$DM_DEV_DIR/$vg/$lv1" "$mount_dir"

	# verify all data
	diff pattern "$mount_dir/pattern1"
	diff pattern "$mount_dir/pattern2"
	diff pattern "$mount_dir/pattern3"
	dd of=/dev/null if="$mount_dir/rand100M" bs=1M count=100
	dd of=/dev/null if="$mount_dir/rand8M" bs=1M count=8

	# extend again while inactive
	umount "$mount_dir"
	lvchange -an $vg/$lv1
	lvextend -L+64M $vg/$lv1 "$dev5"
	lvs -a $vg -o+devices
	lvchange -ay $vg/$lv1
	mount "$DM_DEV_DIR/$vg/$lv1" "$mount_dir"

	# verify all data
	diff pattern "$mount_dir/pattern1"
	diff pattern "$mount_dir/pattern2"
	diff pattern "$mount_dir/pattern3"
	dd of=/dev/null if="$mount_dir/rand100M" bs=1M count=100
	dd of=/dev/null if="$mount_dir/rand8M" bs=1M count=8

	# add more data
	cp pattern "$mount_dir/pattern4"

	# remove the cache
	lvconvert --splitcache $vg/$lv1

	# verify all data
	diff pattern "$mount_dir/pattern1"
	diff pattern "$mount_dir/pattern2"
	diff pattern "$mount_dir/pattern3"
	diff pattern "$mount_dir/pattern4"
	dd of=/dev/null if="$mount_dir/rand100M" bs=1M count=100
	dd of=/dev/null if="$mount_dir/rand8M" bs=1M count=8

	umount "$mount_dir"
	lvchange -an $vg/$lv1
	lvchange -ay $vg/$lv1
	mount "$DM_DEV_DIR/$vg/$lv1" "$mount_dir"

	# verify all data
	diff pattern "$mount_dir/pattern1"
	diff pattern "$mount_dir/pattern2"
	diff pattern "$mount_dir/pattern3"
	diff pattern "$mount_dir/pattern4"
	dd of=/dev/null if="$mount_dir/rand100M" bs=1M count=100
	dd of=/dev/null if="$mount_dir/rand8M" bs=1M count=8

	umount "$mount_dir"
	lvchange -an $vg/$lv1
	lvremove $vg/$lv1
	lvremove -y $vg
}


aux have_cache 1 10 0 || skip
aux have_writecache 1 0 0 || skip
which mkfs.xfs || skip

mount_dir="mnt"
mkdir -p "$mount_dir"

aux prepare_devs 6 66 # want 64M of usable space from each dev

# generate random data
dd if=/dev/urandom of=pattern bs=512K count=1

vgcreate $SHARED $vg "$dev1" "$dev2" "$dev3" "$dev4" "$dev5" "$dev6"

# test type cache|writecache
# cache with cachepool|cachevol
# cache with writeback|writethrough

# lv1 is main LV: 128M
# lv2 is fast LV:  64M

lvcreate -n $lv1 -L128M -an $vg "$dev1" "$dev2"
lvcreate -n $lv2 -L64M -an $vg "$dev3"
lvconvert -y --type writecache --cachevol $lv2 $vg/$lv1
lvs -a $vg -o+devices
do_test

lvcreate -n $lv1 -L128M -an $vg "$dev1" "$dev2"
lvcreate -n $lv2 -L64M -an $vg "$dev3"
lvconvert -y --type cache --cachevol $lv2 --cachemode writeback $vg/$lv1
lvs -a $vg -o+devices
do_test

lvcreate -n $lv1 -L128M -an $vg "$dev1" "$dev2"
lvcreate -n $lv2 -L64M -an $vg "$dev3"
lvconvert -y --type cache --cachevol $lv2 --cachemode writethrough $vg/$lv1
lvs -a $vg -o+devices
do_test

lvcreate -n $lv1 -L128M -an $vg "$dev1" "$dev2"
lvcreate -y --type cache-pool -n $lv2 -L64M --poolmetadataspare n $vg "$dev3" "$dev6"
lvconvert -y --type cache --cachepool $lv2 --poolmetadataspare n $vg/$lv1
lvs -a $vg -o+devices
do_test

vgremove -f $vg