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#!/usr/bin/env python3
# group: rw quick
#
# Copy-on-read tests using a COR filter with a bottom node
#
# Copyright (C) 2018 Red Hat, Inc.
# Copyright (c) 2020 Virtuozzo International GmbH
#
# 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/>.
#
import iotests
from iotests import log, qemu_img, qemu_io
# Need backing file support
iotests.script_initialize(supported_fmts=['qcow2'],
supported_platforms=['linux'])
log('')
log('=== Copy-on-read across nodes ===')
log('')
# This test is similar to the 216 one by Hanna Reitz <hreitz@redhat.com>
# The difference is that this test case involves a bottom node to the
# COR filter driver.
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('mid.img') as mid_img_path, \
iotests.FilePath('top.img') as top_img_path, \
iotests.VM() as vm:
log('--- Setting up images ---')
log('')
qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M')
qemu_io(base_img_path, '-c', 'write -P 1 0M 1M')
qemu_io(base_img_path, '-c', 'write -P 1 3M 1M')
qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
'-F', iotests.imgfmt, mid_img_path)
qemu_io(mid_img_path, '-c', 'write -P 3 2M 1M')
qemu_io(mid_img_path, '-c', 'write -P 3 4M 1M')
qemu_img('create', '-f', iotests.imgfmt, '-b', mid_img_path,
'-F', iotests.imgfmt, top_img_path)
qemu_io(top_img_path, '-c', 'write -P 2 1M 1M')
# 0 1 2 3 4
# top 2
# mid 3 3
# base 1 1
log('Done')
log('')
log('--- Doing COR ---')
log('')
vm.launch()
log(vm.qmp('blockdev-add',
node_name='node0',
driver='copy-on-read',
bottom='node2',
file={
'driver': iotests.imgfmt,
'file': {
'driver': 'file',
'filename': top_img_path
},
'backing': {
'node-name': 'node2',
'driver': iotests.imgfmt,
'file': {
'driver': 'file',
'filename': mid_img_path
},
'backing': {
'driver': iotests.imgfmt,
'file': {
'driver': 'file',
'filename': base_img_path
}
},
}
}))
# Trigger COR
log(vm.qmp('human-monitor-command',
command_line='qemu-io node0 "read 0 5M"'))
vm.shutdown()
log('')
log('--- Checking COR result ---')
log('')
# Detach backing to check that we can read the data from the top level now
qemu_img('rebase', '-u', '-b', '', '-f', iotests.imgfmt, top_img_path)
qemu_io(top_img_path, '-c', 'read -P 0 0 1M')
qemu_io(top_img_path, '-c', 'read -P 2 1M 1M')
qemu_io(top_img_path, '-c', 'read -P 3 2M 1M')
qemu_io(top_img_path, '-c', 'read -P 0 3M 1M')
qemu_io(top_img_path, '-c', 'read -P 3 4M 1M')
log('Done')
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