tests/qemu-iotests/312

#!/usr/bin/env bash
# group: rw quick
#
# Test drive-mirror with quorum
#
# The goal of this test is to check how the quorum driver reports
# regions that are known to read as zeroes (BDRV_BLOCK_ZERO). The idea
# is that drive-mirror will try the efficient representation of zeroes
# in the destination image instead of writing actual zeroes.
#
# Copyright (C) 2020 Igalia, S.L.
# Author: Alberto Garcia <berto@igalia.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# creator
owner=berto@igalia.com

seq=`basename $0`
echo "QA output created by $seq"

status=1	# failure is the default!

_cleanup()
{
    _rm_test_img "$TEST_IMG.0"
    _rm_test_img "$TEST_IMG.1"
    _rm_test_img "$TEST_IMG.2"
    _rm_test_img "$TEST_IMG.3"
    _cleanup_qemu
}
trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.qemu

_supported_fmt qcow2
_supported_proto file
_supported_os Linux
_unsupported_imgopts cluster_size data_file

echo
echo '### Create all images' # three source (quorum), one destination
echo
TEST_IMG="$TEST_IMG.0" _make_test_img -o cluster_size=64k 10M
TEST_IMG="$TEST_IMG.1" _make_test_img -o cluster_size=64k 10M
TEST_IMG="$TEST_IMG.2" _make_test_img -o cluster_size=64k 10M
TEST_IMG="$TEST_IMG.3" _make_test_img -o cluster_size=64k 10M

quorum="driver=raw,file.driver=quorum,file.vote-threshold=2"
quorum="$quorum,file.children.0.file.filename=$TEST_IMG.0"
quorum="$quorum,file.children.1.file.filename=$TEST_IMG.1"
quorum="$quorum,file.children.2.file.filename=$TEST_IMG.2"
quorum="$quorum,file.children.0.driver=$IMGFMT"
quorum="$quorum,file.children.1.driver=$IMGFMT"
quorum="$quorum,file.children.2.driver=$IMGFMT"

echo
echo '### Output of qemu-img map (empty quorum)'
echo
$QEMU_IMG map --image-opts $quorum | _filter_qemu_img_map

# Now we write data to the quorum. All three images will read as
# zeroes in all cases, but with different ways to represent them
# (unallocated clusters, zero clusters, data clusters with zeroes)
# that will have an effect on how the data will be mirrored and the
# output of qemu-img map on the resulting image.
echo
echo '### Write data to the quorum'
echo
# Test 1: data regions surrounded by unallocated clusters.
# Three data regions, the largest one (0x30000) will be picked, end result:
# offset 0x10000, length 0x30000 -> data
$QEMU_IO -c "write -P 0 $((0x10000)) $((0x10000))" "$TEST_IMG.0" | _filter_qemu_io
$QEMU_IO -c "write -P 0 $((0x10000)) $((0x30000))" "$TEST_IMG.1" | _filter_qemu_io
$QEMU_IO -c "write -P 0 $((0x10000)) $((0x20000))" "$TEST_IMG.2" | _filter_qemu_io

# Test 2: zero regions surrounded by data clusters.
# First we allocate the data clusters.
$QEMU_IO -c "open -o $quorum" -c "write -P 0 $((0x100000)) $((0x40000))" | _filter_qemu_io

# Three zero regions, the smallest one (0x10000) will be picked, end result:
# offset 0x100000, length 0x10000 -> data
# offset 0x110000, length 0x10000 -> zeroes
# offset 0x120000, length 0x20000 -> data
$QEMU_IO -c "write -z $((0x110000)) $((0x10000))" "$TEST_IMG.0" | _filter_qemu_io
$QEMU_IO -c "write -z $((0x110000)) $((0x30000))" "$TEST_IMG.1" | _filter_qemu_io
$QEMU_IO -c "write -z $((0x110000)) $((0x20000))" "$TEST_IMG.2" | _filter_qemu_io

# Test 3: zero clusters surrounded by unallocated clusters.
# Everything reads as zeroes, no effect on the end result.
$QEMU_IO -c "write -z $((0x150000)) $((0x10000))" "$TEST_IMG.0" | _filter_qemu_io
$QEMU_IO -c "write -z $((0x150000)) $((0x30000))" "$TEST_IMG.1" | _filter_qemu_io
$QEMU_IO -c "write -z $((0x150000)) $((0x20000))" "$TEST_IMG.2" | _filter_qemu_io

# Test 4: mix of data and zero clusters.
# The zero region will be ignored in favor of the largest data region
# (0x20000), end result:
# offset 0x200000, length 0x20000 -> data
$QEMU_IO -c "write -P 0 $((0x200000)) $((0x10000))" "$TEST_IMG.0" | _filter_qemu_io
$QEMU_IO -c "write -z   $((0x200000)) $((0x30000))" "$TEST_IMG.1" | _filter_qemu_io
$QEMU_IO -c "write -P 0 $((0x200000)) $((0x20000))" "$TEST_IMG.2" | _filter_qemu_io

# Test 5: write data to a region and then zeroize it, doing it
# directly on the quorum device instead of the individual images.
# This has no effect on the end result but proves that the quorum driver
# supports 'write -z'.
$QEMU_IO -c "open -o $quorum" -c "write -P 1 $((0x250000)) $((0x10000))" | _filter_qemu_io
# Verify the data that we just wrote
$QEMU_IO -c "open -o $quorum" -c "read -P 1 $((0x250000)) $((0x10000))" | _filter_qemu_io
$QEMU_IO -c "open -o $quorum" -c "write -z $((0x250000)) $((0x10000))" | _filter_qemu_io
# Now it should read back as zeroes
$QEMU_IO -c "open -o $quorum" -c "read -P 0 $((0x250000)) $((0x10000))" | _filter_qemu_io

echo
echo '### Launch the drive-mirror job'
echo
qemu_comm_method="qmp" _launch_qemu -drive if=virtio,"$quorum"
h=$QEMU_HANDLE
_send_qemu_cmd $h "{ 'execute': 'qmp_capabilities' }" 'return'

_send_qemu_cmd $h \
    "{'execute': 'drive-mirror',
                 'arguments': {'device': 'virtio0',
                               'format': '$IMGFMT',
                               'target': '$TEST_IMG.3',
                               'sync':   'full',
                               'mode':   'existing' }}"    \
     "BLOCK_JOB_READY.*virtio0"

_send_qemu_cmd $h \
    "{ 'execute': 'block-job-complete',
       'arguments': { 'device': 'virtio0' } }" \
    'BLOCK_JOB_COMPLETED'

_send_qemu_cmd $h "{ 'execute': 'quit' }" ''

echo
echo '### Output of qemu-img map (destination image)'
echo
$QEMU_IMG map "$TEST_IMG.3" | _filter_qemu_img_map

# success, all done
echo "*** done"
rm -f $seq.full
status=0