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qemu-e2k/tests/qemu-iotests/tests/image-fleecing

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#!/usr/bin/env python3
# group: rw quick
#
# This test covers the basic fleecing workflow, which provides a
# point-in-time snapshot of a node that can be queried over NBD.
#
# Copyright (C) 2018 Red Hat, Inc.
# John helped, too.
#
# 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: John Snow <jsnow@redhat.com>
import iotests
from iotests import log, qemu_img, qemu_io, qemu_io_silent, \
qemu_io_pipe_and_status
iotests.script_initialize(
supported_fmts=['qcow2'],
supported_platforms=['linux'],
required_fmts=['copy-before-write'],
unsupported_imgopts=['compat']
)
patterns = [('0x5d', '0', '64k'),
('0xd5', '1M', '64k'),
('0xdc', '32M', '64k'),
('0xcd', '0x3ff0000', '64k')] # 64M - 64K
overwrite = [('0xab', '0', '64k'), # Full overwrite
('0xad', '0x00f8000', '64k'), # Partial-left (1M-32K)
('0x1d', '0x2008000', '64k'), # Partial-right (32M+32K)
('0xea', '0x3fe0000', '64k')] # Adjacent-left (64M - 128K)
zeroes = [('0', '0x00f8000', '32k'), # Left-end of partial-left (1M-32K)
('0', '0x2010000', '32k'), # Right-end of partial-right (32M+64K)
('0', '0x3fe0000', '64k')] # overwrite[3]
remainder = [('0xd5', '0x108000', '32k'), # Right-end of partial-left [1]
('0xdc', '32M', '32k'), # Left-end of partial-right [2]
('0xcd', '0x3ff0000', '64k')] # patterns[3]
def do_test(vm, use_cbw, use_snapshot_access_filter, base_img_path,
fleece_img_path, nbd_sock_path=None,
target_img_path=None,
bitmap=False):
push_backup = target_img_path is not None
assert (nbd_sock_path is not None) != push_backup
if push_backup:
assert use_cbw
log('--- Setting up images ---')
log('')
qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M')
if bitmap:
qemu_img('bitmap', '--add', base_img_path, 'bitmap0')
if use_snapshot_access_filter:
assert use_cbw
qemu_img('create', '-f', 'raw', fleece_img_path, '64M')
else:
qemu_img('create', '-f', 'qcow2', fleece_img_path, '64M')
if push_backup:
qemu_img('create', '-f', 'qcow2', target_img_path, '64M')
for p in patterns:
qemu_io('-f', iotests.imgfmt,
'-c', 'write -P%s %s %s' % p, base_img_path)
log('Done')
log('')
log('--- Launching VM ---')
log('')
src_node = 'source'
tmp_node = 'temp'
qom_path = '/machine/peripheral/sda'
vm.add_blockdev(f'driver={iotests.imgfmt},file.driver=file,'
f'file.filename={base_img_path},node-name={src_node}')
vm.add_device('virtio-scsi')
vm.add_device(f'scsi-hd,id=sda,drive={src_node}')
vm.launch()
log('Done')
log('')
log('--- Setting up Fleecing Graph ---')
log('')
if use_snapshot_access_filter:
log(vm.qmp('blockdev-add', {
'node-name': tmp_node,
'driver': 'file',
'filename': fleece_img_path,
}))
else:
# create tmp_node backed by src_node
log(vm.qmp('blockdev-add', {
'driver': 'qcow2',
'node-name': tmp_node,
'file': {
'driver': 'file',
'filename': fleece_img_path,
},
'backing': src_node,
}))
# Establish CBW from source to fleecing node
if use_cbw:
fl_cbw = {
'driver': 'copy-before-write',
'node-name': 'fl-cbw',
'file': src_node,
'target': tmp_node
}
if bitmap:
fl_cbw['bitmap'] = {'node': src_node, 'name': 'bitmap0'}
log(vm.qmp('blockdev-add', fl_cbw))
log(vm.qmp('qom-set', path=qom_path, property='drive', value='fl-cbw'))
if use_snapshot_access_filter:
log(vm.qmp('blockdev-add', {
'driver': 'snapshot-access',
'node-name': 'fl-access',
'file': 'fl-cbw',
}))
else:
log(vm.qmp('blockdev-backup',
job_id='fleecing',
device=src_node,
target=tmp_node,
sync='none'))
export_node = 'fl-access' if use_snapshot_access_filter else tmp_node
if push_backup:
log('')
log('--- Starting actual backup ---')
log('')
log(vm.qmp('blockdev-add', **{
'driver': iotests.imgfmt,
'node-name': 'target',
'file': {
'driver': 'file',
'filename': target_img_path
}
}))
log(vm.qmp('blockdev-backup', device=export_node,
sync='full', target='target',
job_id='push-backup', speed=1))
else:
log('')
log('--- Setting up NBD Export ---')
log('')
nbd_uri = 'nbd+unix:///%s?socket=%s' % (export_node, nbd_sock_path)
log(vm.qmp('nbd-server-start',
{'addr': { 'type': 'unix',
'data': { 'path': nbd_sock_path } } }))
log(vm.qmp('nbd-server-add', device=export_node))
log('')
log('--- Sanity Check ---')
log('')
for p in patterns + zeroes:
cmd = 'read -P%s %s %s' % p
log(cmd)
out, ret = qemu_io_pipe_and_status('-r', '-f', 'raw', '-c', cmd,
nbd_uri)
if ret != 0:
print(out)
log('')
log('--- Testing COW ---')
log('')
for p in overwrite:
cmd = 'write -P%s %s %s' % p
log(cmd)
log(vm.hmp_qemu_io(qom_path, cmd, qdev=True))
if push_backup:
# Check that previous operations were done during backup, not after
# If backup is already finished, it's possible that it was finished
# even before hmp qemu_io write, and we didn't actually test
# copy-before-write operation. This should not happen, as we use
# speed=1. But worth checking.
result = vm.qmp('query-block-jobs')
assert len(result['return']) == 1
result = vm.qmp('block-job-set-speed', device='push-backup', speed=0)
assert result == {'return': {}}
log(vm.event_wait(name='BLOCK_JOB_COMPLETED',
match={'data': {'device': 'push-backup'}}),
filters=[iotests.filter_qmp_event])
log(vm.qmp('blockdev-del', node_name='target'))
log('')
log('--- Verifying Data ---')
log('')
for p in patterns + zeroes:
cmd = 'read -P%s %s %s' % p
log(cmd)
args = ['-r', '-c', cmd]
if push_backup:
args += [target_img_path]
else:
args += ['-f', 'raw', nbd_uri]
out, ret = qemu_io_pipe_and_status(*args)
if ret != 0:
print(out)
log('')
log('--- Cleanup ---')
log('')
if not push_backup:
log(vm.qmp('nbd-server-stop'))
if use_cbw:
if use_snapshot_access_filter:
log(vm.qmp('blockdev-del', node_name='fl-access'))
log(vm.qmp('qom-set', path=qom_path, property='drive', value=src_node))
log(vm.qmp('blockdev-del', node_name='fl-cbw'))
else:
log(vm.qmp('block-job-cancel', device='fleecing'))
e = vm.event_wait('BLOCK_JOB_CANCELLED')
assert e is not None
log(e, filters=[iotests.filter_qmp_event])
log(vm.qmp('blockdev-del', node_name=tmp_node))
vm.shutdown()
log('')
log('--- Confirming writes ---')
log('')
for p in overwrite + remainder:
cmd = 'read -P%s %s %s' % p
log(cmd)
assert qemu_io_silent(base_img_path, '-c', cmd) == 0
log('')
log('Done')
def test(use_cbw, use_snapshot_access_filter,
nbd_sock_path=None, target_img_path=None, bitmap=False):
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('fleece.img') as fleece_img_path, \
iotests.VM() as vm:
do_test(vm, use_cbw, use_snapshot_access_filter, base_img_path,
fleece_img_path, nbd_sock_path, target_img_path,
bitmap=bitmap)
def test_pull(use_cbw, use_snapshot_access_filter, bitmap=False):
with iotests.FilePath('nbd.sock',
base_dir=iotests.sock_dir) as nbd_sock_path:
test(use_cbw, use_snapshot_access_filter, nbd_sock_path, None,
bitmap=bitmap)
def test_push():
with iotests.FilePath('target.img') as target_img_path:
test(True, True, None, target_img_path)
log('=== Test backup(sync=none) based fleecing ===\n')
test_pull(False, False)
log('=== Test cbw-filter based fleecing ===\n')
test_pull(True, False)
log('=== Test fleecing-format based fleecing ===\n')
test_pull(True, True)
log('=== Test fleecing-format based fleecing with bitmap ===\n')
test_pull(True, True, bitmap=True)
log('=== Test push backup with fleecing ===\n')
test_push()
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