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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
iotests.script_initialize(
supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk', 'vhdx', 'raw'],
supported_platforms=['linux'],
)
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]
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('fleece.img') as fleece_img_path, \
iotests.FilePath('nbd.sock',
base_dir=iotests.sock_dir) as nbd_sock_path, \
iotests.VM() as vm:
log('--- Setting up images ---')
log('')
assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
assert qemu_img('create', '-f', 'qcow2', fleece_img_path, '64M') == 0
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'
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('')
# 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 COW from source to fleecing node
log(vm.qmp('blockdev-backup',
job_id='fleecing',
device=src_node,
target=tmp_node,
sync='none'))
log('')
log('--- Setting up NBD Export ---')
log('')
nbd_uri = 'nbd+unix:///%s?socket=%s' % (tmp_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=tmp_node))
log('')
log('--- Sanity Check ---')
log('')
for p in patterns + zeroes:
cmd = 'read -P%s %s %s' % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
log('')
log('--- Testing COW ---')
log('')
for p in overwrite:
cmd = 'write -P%s %s %s' % p
log(cmd)
log(vm.hmp_qemu_io('/machine/peripheral/sda', cmd, qdev=True))
log('')
log('--- Verifying Data ---')
log('')
for p in patterns + zeroes:
cmd = 'read -P%s %s %s' % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
log('')
log('--- Cleanup ---')
log('')
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('nbd-server-stop'))
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')
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