631 lines
23 KiB
Python
631 lines
23 KiB
Python
#!/usr/bin/env python
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#
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# Tests for incremental drive-backup
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#
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# Copyright (C) 2015 John Snow for Red Hat, Inc.
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#
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# Based on 056.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import iotests
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def io_write_patterns(img, patterns):
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for pattern in patterns:
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iotests.qemu_io('-c', 'write -P%s %s %s' % pattern, img)
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def try_remove(img):
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try:
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os.remove(img)
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except OSError:
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pass
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def transaction_action(action, **kwargs):
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return {
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'type': action,
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'data': dict((k.replace('_', '-'), v) for k, v in kwargs.iteritems())
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}
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def transaction_bitmap_clear(node, name, **kwargs):
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return transaction_action('block-dirty-bitmap-clear',
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node=node, name=name, **kwargs)
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def transaction_drive_backup(device, target, **kwargs):
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return transaction_action('drive-backup', job_id=device, device=device,
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target=target, **kwargs)
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class Bitmap:
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def __init__(self, name, drive):
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self.name = name
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self.drive = drive
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self.num = 0
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self.backups = list()
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def base_target(self):
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return (self.drive['backup'], None)
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def new_target(self, num=None):
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if num is None:
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num = self.num
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self.num = num + 1
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base = os.path.join(iotests.test_dir,
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"%s.%s." % (self.drive['id'], self.name))
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suff = "%i.%s" % (num, self.drive['fmt'])
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target = base + "inc" + suff
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reference = base + "ref" + suff
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self.backups.append((target, reference))
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return (target, reference)
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def last_target(self):
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if self.backups:
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return self.backups[-1]
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return self.base_target()
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def del_target(self):
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for image in self.backups.pop():
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try_remove(image)
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self.num -= 1
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def cleanup(self):
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for backup in self.backups:
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for image in backup:
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try_remove(image)
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class TestIncrementalBackupBase(iotests.QMPTestCase):
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def __init__(self, *args):
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super(TestIncrementalBackupBase, self).__init__(*args)
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self.bitmaps = list()
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self.files = list()
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self.drives = list()
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self.vm = iotests.VM()
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self.err_img = os.path.join(iotests.test_dir, 'err.%s' % iotests.imgfmt)
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def setUp(self):
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# Create a base image with a distinctive patterning
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drive0 = self.add_node('drive0')
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self.img_create(drive0['file'], drive0['fmt'])
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self.vm.add_drive(drive0['file'])
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self.write_default_pattern(drive0['file'])
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self.vm.launch()
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def write_default_pattern(self, target):
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io_write_patterns(target, (('0x41', 0, 512),
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('0xd5', '1M', '32k'),
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('0xdc', '32M', '124k')))
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def add_node(self, node_id, fmt=iotests.imgfmt, path=None, backup=None):
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if path is None:
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path = os.path.join(iotests.test_dir, '%s.%s' % (node_id, fmt))
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if backup is None:
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backup = os.path.join(iotests.test_dir,
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'%s.full.backup.%s' % (node_id, fmt))
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self.drives.append({
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'id': node_id,
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'file': path,
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'backup': backup,
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'fmt': fmt })
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return self.drives[-1]
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def img_create(self, img, fmt=iotests.imgfmt, size='64M',
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parent=None, parentFormat=None, **kwargs):
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optargs = []
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for k,v in kwargs.iteritems():
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optargs = optargs + ['-o', '%s=%s' % (k,v)]
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args = ['create', '-f', fmt] + optargs + [img, size]
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if parent:
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if parentFormat is None:
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parentFormat = fmt
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args = args + ['-b', parent, '-F', parentFormat]
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iotests.qemu_img(*args)
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self.files.append(img)
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def do_qmp_backup(self, error='Input/output error', **kwargs):
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res = self.vm.qmp('drive-backup', **kwargs)
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self.assert_qmp(res, 'return', {})
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return self.wait_qmp_backup(kwargs['device'], error)
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def wait_qmp_backup(self, device, error='Input/output error'):
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event = self.vm.event_wait(name="BLOCK_JOB_COMPLETED",
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match={'data': {'device': device}})
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self.assertNotEqual(event, None)
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try:
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failure = self.dictpath(event, 'data/error')
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except AssertionError:
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# Backup succeeded.
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self.assert_qmp(event, 'data/offset', event['data']['len'])
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return True
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else:
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# Backup failed.
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self.assert_qmp(event, 'data/error', error)
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return False
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def wait_qmp_backup_cancelled(self, device):
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event = self.vm.event_wait(name='BLOCK_JOB_CANCELLED',
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match={'data': {'device': device}})
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self.assertNotEqual(event, None)
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def create_anchor_backup(self, drive=None):
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if drive is None:
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drive = self.drives[-1]
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res = self.do_qmp_backup(job_id=drive['id'],
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device=drive['id'], sync='full',
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format=drive['fmt'], target=drive['backup'])
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self.assertTrue(res)
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self.files.append(drive['backup'])
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return drive['backup']
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def make_reference_backup(self, bitmap=None):
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if bitmap is None:
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bitmap = self.bitmaps[-1]
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_, reference = bitmap.last_target()
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res = self.do_qmp_backup(job_id=bitmap.drive['id'],
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device=bitmap.drive['id'], sync='full',
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format=bitmap.drive['fmt'], target=reference)
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self.assertTrue(res)
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def add_bitmap(self, name, drive, **kwargs):
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bitmap = Bitmap(name, drive)
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self.bitmaps.append(bitmap)
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result = self.vm.qmp('block-dirty-bitmap-add', node=drive['id'],
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name=bitmap.name, **kwargs)
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self.assert_qmp(result, 'return', {})
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return bitmap
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def prepare_backup(self, bitmap=None, parent=None):
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if bitmap is None:
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bitmap = self.bitmaps[-1]
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if parent is None:
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parent, _ = bitmap.last_target()
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target, _ = bitmap.new_target()
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self.img_create(target, bitmap.drive['fmt'], parent=parent)
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return target
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def create_incremental(self, bitmap=None, parent=None,
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parentFormat=None, validate=True):
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if bitmap is None:
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bitmap = self.bitmaps[-1]
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if parent is None:
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parent, _ = bitmap.last_target()
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target = self.prepare_backup(bitmap, parent)
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res = self.do_qmp_backup(job_id=bitmap.drive['id'],
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device=bitmap.drive['id'],
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sync='incremental', bitmap=bitmap.name,
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format=bitmap.drive['fmt'], target=target,
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mode='existing')
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if not res:
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bitmap.del_target();
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self.assertFalse(validate)
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else:
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self.make_reference_backup(bitmap)
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return res
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def check_backups(self):
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for bitmap in self.bitmaps:
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for incremental, reference in bitmap.backups:
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self.assertTrue(iotests.compare_images(incremental, reference))
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last = bitmap.last_target()[0]
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self.assertTrue(iotests.compare_images(last, bitmap.drive['file']))
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def hmp_io_writes(self, drive, patterns):
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for pattern in patterns:
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self.vm.hmp_qemu_io(drive, 'write -P%s %s %s' % pattern)
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self.vm.hmp_qemu_io(drive, 'flush')
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def do_incremental_simple(self, **kwargs):
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self.create_anchor_backup()
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self.add_bitmap('bitmap0', self.drives[0], **kwargs)
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# Sanity: Create a "hollow" incremental backup
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self.create_incremental()
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# Three writes: One complete overwrite, one new segment,
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# and one partial overlap.
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self.hmp_io_writes(self.drives[0]['id'], (('0xab', 0, 512),
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('0xfe', '16M', '256k'),
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('0x64', '32736k', '64k')))
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self.create_incremental()
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# Three more writes, one of each kind, like above
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self.hmp_io_writes(self.drives[0]['id'], (('0x9a', 0, 512),
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('0x55', '8M', '352k'),
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('0x78', '15872k', '1M')))
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self.create_incremental()
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self.vm.shutdown()
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self.check_backups()
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def tearDown(self):
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self.vm.shutdown()
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for bitmap in self.bitmaps:
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bitmap.cleanup()
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for filename in self.files:
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try_remove(filename)
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class TestIncrementalBackup(TestIncrementalBackupBase):
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def test_incremental_simple(self):
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'''
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Test: Create and verify three incremental backups.
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Create a bitmap and a full backup before VM execution begins,
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then create a series of three incremental backups "during execution,"
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i.e.; after IO requests begin modifying the drive.
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'''
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return self.do_incremental_simple()
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def test_small_granularity(self):
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'''
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Test: Create and verify backups made with a small granularity bitmap.
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Perform the same test as test_incremental_simple, but with a granularity
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of only 32KiB instead of the present default of 64KiB.
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'''
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return self.do_incremental_simple(granularity=32768)
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def test_large_granularity(self):
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'''
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Test: Create and verify backups made with a large granularity bitmap.
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Perform the same test as test_incremental_simple, but with a granularity
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of 128KiB instead of the present default of 64KiB.
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'''
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return self.do_incremental_simple(granularity=131072)
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def test_larger_cluster_target(self):
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'''
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Test: Create and verify backups made to a larger cluster size target.
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With a default granularity of 64KiB, verify that backups made to a
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larger cluster size target of 128KiB without a backing file works.
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'''
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drive0 = self.drives[0]
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# Create a cluster_size=128k full backup / "anchor" backup
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self.img_create(drive0['backup'], cluster_size='128k')
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self.assertTrue(self.do_qmp_backup(device=drive0['id'], sync='full',
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format=drive0['fmt'],
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target=drive0['backup'],
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mode='existing'))
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# Create bitmap and dirty it with some new writes.
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# overwrite [32736, 32799] which will dirty bitmap clusters at
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# 32M-64K and 32M. 32M+64K will be left undirtied.
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bitmap0 = self.add_bitmap('bitmap0', drive0)
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self.hmp_io_writes(drive0['id'],
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(('0xab', 0, 512),
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('0xfe', '16M', '256k'),
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('0x64', '32736k', '64k')))
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# Check the dirty bitmap stats
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result = self.vm.qmp('query-block')
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self.assert_qmp(result, 'return[0]/dirty-bitmaps[0]/name', 'bitmap0')
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self.assert_qmp(result, 'return[0]/dirty-bitmaps[0]/count', 458752)
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self.assert_qmp(result, 'return[0]/dirty-bitmaps[0]/granularity', 65536)
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self.assert_qmp(result, 'return[0]/dirty-bitmaps[0]/status', 'active')
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# Prepare a cluster_size=128k backup target without a backing file.
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(target, _) = bitmap0.new_target()
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self.img_create(target, bitmap0.drive['fmt'], cluster_size='128k')
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# Perform Incremental Backup
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self.assertTrue(self.do_qmp_backup(device=bitmap0.drive['id'],
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sync='incremental',
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bitmap=bitmap0.name,
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format=bitmap0.drive['fmt'],
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target=target,
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mode='existing'))
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self.make_reference_backup(bitmap0)
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# Add the backing file, then compare and exit.
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iotests.qemu_img('rebase', '-f', drive0['fmt'], '-u', '-b',
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drive0['backup'], '-F', drive0['fmt'], target)
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self.vm.shutdown()
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self.check_backups()
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def test_incremental_transaction(self):
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'''Test: Verify backups made from transactionally created bitmaps.
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Create a bitmap "before" VM execution begins, then create a second
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bitmap AFTER writes have already occurred. Use transactions to create
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a full backup and synchronize both bitmaps to this backup.
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Create an incremental backup through both bitmaps and verify that
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both backups match the current drive0 image.
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'''
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drive0 = self.drives[0]
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bitmap0 = self.add_bitmap('bitmap0', drive0)
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self.hmp_io_writes(drive0['id'], (('0xab', 0, 512),
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('0xfe', '16M', '256k'),
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('0x64', '32736k', '64k')))
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bitmap1 = self.add_bitmap('bitmap1', drive0)
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result = self.vm.qmp('transaction', actions=[
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transaction_bitmap_clear(bitmap0.drive['id'], bitmap0.name),
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transaction_bitmap_clear(bitmap1.drive['id'], bitmap1.name),
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transaction_drive_backup(drive0['id'], drive0['backup'],
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sync='full', format=drive0['fmt'])
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])
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self.assert_qmp(result, 'return', {})
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self.wait_until_completed(drive0['id'])
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self.files.append(drive0['backup'])
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self.hmp_io_writes(drive0['id'], (('0x9a', 0, 512),
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('0x55', '8M', '352k'),
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('0x78', '15872k', '1M')))
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# Both bitmaps should be correctly in sync.
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self.create_incremental(bitmap0)
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self.create_incremental(bitmap1)
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self.vm.shutdown()
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self.check_backups()
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def do_transaction_failure_test(self, race=False):
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# Create a second drive, with pattern:
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drive1 = self.add_node('drive1')
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self.img_create(drive1['file'], drive1['fmt'])
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io_write_patterns(drive1['file'], (('0x14', 0, 512),
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('0x5d', '1M', '32k'),
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('0xcd', '32M', '124k')))
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# Create a blkdebug interface to this img as 'drive1'
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result = self.vm.qmp('blockdev-add',
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node_name=drive1['id'],
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driver=drive1['fmt'],
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file={
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'driver': 'blkdebug',
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'image': {
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'driver': 'file',
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'filename': drive1['file']
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},
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'set-state': [{
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'event': 'flush_to_disk',
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'state': 1,
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'new_state': 2
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}],
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'inject-error': [{
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'event': 'read_aio',
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'errno': 5,
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'state': 2,
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'immediately': False,
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'once': True
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}],
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}
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)
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self.assert_qmp(result, 'return', {})
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# Create bitmaps and full backups for both drives
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drive0 = self.drives[0]
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dr0bm0 = self.add_bitmap('bitmap0', drive0)
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dr1bm0 = self.add_bitmap('bitmap0', drive1)
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self.create_anchor_backup(drive0)
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self.create_anchor_backup(drive1)
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self.assert_no_active_block_jobs()
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self.assertFalse(self.vm.get_qmp_events(wait=False))
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# Emulate some writes
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if not race:
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self.hmp_io_writes(drive0['id'], (('0xab', 0, 512),
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('0xfe', '16M', '256k'),
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('0x64', '32736k', '64k')))
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self.hmp_io_writes(drive1['id'], (('0xba', 0, 512),
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('0xef', '16M', '256k'),
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('0x46', '32736k', '64k')))
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# Create incremental backup targets
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target0 = self.prepare_backup(dr0bm0)
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target1 = self.prepare_backup(dr1bm0)
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# Ask for a new incremental backup per-each drive,
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# expecting drive1's backup to fail. In the 'race' test,
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# we expect drive1 to attempt to cancel the empty drive0 job.
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transaction = [
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transaction_drive_backup(drive0['id'], target0, sync='incremental',
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format=drive0['fmt'], mode='existing',
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bitmap=dr0bm0.name),
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transaction_drive_backup(drive1['id'], target1, sync='incremental',
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format=drive1['fmt'], mode='existing',
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bitmap=dr1bm0.name)
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]
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result = self.vm.qmp('transaction', actions=transaction,
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properties={'completion-mode': 'grouped'} )
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self.assert_qmp(result, 'return', {})
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# Observe that drive0's backup is cancelled and drive1 completes with
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# an error.
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self.wait_qmp_backup_cancelled(drive0['id'])
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self.assertFalse(self.wait_qmp_backup(drive1['id']))
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error = self.vm.event_wait('BLOCK_JOB_ERROR')
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self.assert_qmp(error, 'data', {'device': drive1['id'],
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'action': 'report',
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'operation': 'read'})
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self.assertFalse(self.vm.get_qmp_events(wait=False))
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self.assert_no_active_block_jobs()
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# Delete drive0's successful target and eliminate our record of the
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# unsuccessful drive1 target.
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dr0bm0.del_target()
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dr1bm0.del_target()
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if race:
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# Don't re-run the transaction, we only wanted to test the race.
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self.vm.shutdown()
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return
|
|
|
|
# Re-run the same transaction:
|
|
target0 = self.prepare_backup(dr0bm0)
|
|
target1 = self.prepare_backup(dr1bm0)
|
|
|
|
# Re-run the exact same transaction.
|
|
result = self.vm.qmp('transaction', actions=transaction,
|
|
properties={'completion-mode':'grouped'})
|
|
self.assert_qmp(result, 'return', {})
|
|
|
|
# Both should complete successfully this time.
|
|
self.assertTrue(self.wait_qmp_backup(drive0['id']))
|
|
self.assertTrue(self.wait_qmp_backup(drive1['id']))
|
|
self.make_reference_backup(dr0bm0)
|
|
self.make_reference_backup(dr1bm0)
|
|
self.assertFalse(self.vm.get_qmp_events(wait=False))
|
|
self.assert_no_active_block_jobs()
|
|
|
|
# And the images should of course validate.
|
|
self.vm.shutdown()
|
|
self.check_backups()
|
|
|
|
def test_transaction_failure(self):
|
|
'''Test: Verify backups made from a transaction that partially fails.
|
|
|
|
Add a second drive with its own unique pattern, and add a bitmap to each
|
|
drive. Use blkdebug to interfere with the backup on just one drive and
|
|
attempt to create a coherent incremental backup across both drives.
|
|
|
|
verify a failure in one but not both, then delete the failed stubs and
|
|
re-run the same transaction.
|
|
|
|
verify that both incrementals are created successfully.
|
|
'''
|
|
self.do_transaction_failure_test()
|
|
|
|
def test_transaction_failure_race(self):
|
|
'''Test: Verify that transactions with jobs that have no data to
|
|
transfer do not cause race conditions in the cancellation of the entire
|
|
transaction job group.
|
|
'''
|
|
self.do_transaction_failure_test(race=True)
|
|
|
|
|
|
def test_sync_dirty_bitmap_missing(self):
|
|
self.assert_no_active_block_jobs()
|
|
self.files.append(self.err_img)
|
|
result = self.vm.qmp('drive-backup', device=self.drives[0]['id'],
|
|
sync='incremental', format=self.drives[0]['fmt'],
|
|
target=self.err_img)
|
|
self.assert_qmp(result, 'error/class', 'GenericError')
|
|
|
|
|
|
def test_sync_dirty_bitmap_not_found(self):
|
|
self.assert_no_active_block_jobs()
|
|
self.files.append(self.err_img)
|
|
result = self.vm.qmp('drive-backup', device=self.drives[0]['id'],
|
|
sync='incremental', bitmap='unknown',
|
|
format=self.drives[0]['fmt'], target=self.err_img)
|
|
self.assert_qmp(result, 'error/class', 'GenericError')
|
|
|
|
|
|
def test_sync_dirty_bitmap_bad_granularity(self):
|
|
'''
|
|
Test: Test what happens if we provide an improper granularity.
|
|
|
|
The granularity must always be a power of 2.
|
|
'''
|
|
self.assert_no_active_block_jobs()
|
|
self.assertRaises(AssertionError, self.add_bitmap,
|
|
'bitmap0', self.drives[0],
|
|
granularity=64000)
|
|
|
|
|
|
class TestIncrementalBackupBlkdebug(TestIncrementalBackupBase):
|
|
'''Incremental backup tests that utilize a BlkDebug filter on drive0.'''
|
|
|
|
def setUp(self):
|
|
drive0 = self.add_node('drive0')
|
|
self.img_create(drive0['file'], drive0['fmt'])
|
|
self.write_default_pattern(drive0['file'])
|
|
self.vm.launch()
|
|
|
|
def test_incremental_failure(self):
|
|
'''Test: Verify backups made after a failure are correct.
|
|
|
|
Simulate a failure during an incremental backup block job,
|
|
emulate additional writes, then create another incremental backup
|
|
afterwards and verify that the backup created is correct.
|
|
'''
|
|
|
|
drive0 = self.drives[0]
|
|
result = self.vm.qmp('blockdev-add',
|
|
node_name=drive0['id'],
|
|
driver=drive0['fmt'],
|
|
file={
|
|
'driver': 'blkdebug',
|
|
'image': {
|
|
'driver': 'file',
|
|
'filename': drive0['file']
|
|
},
|
|
'set-state': [{
|
|
'event': 'flush_to_disk',
|
|
'state': 1,
|
|
'new_state': 2
|
|
}],
|
|
'inject-error': [{
|
|
'event': 'read_aio',
|
|
'errno': 5,
|
|
'state': 2,
|
|
'immediately': False,
|
|
'once': True
|
|
}],
|
|
}
|
|
)
|
|
self.assert_qmp(result, 'return', {})
|
|
|
|
self.create_anchor_backup(drive0)
|
|
self.add_bitmap('bitmap0', drive0)
|
|
# Note: at this point, during a normal execution,
|
|
# Assume that the VM resumes and begins issuing IO requests here.
|
|
|
|
self.hmp_io_writes(drive0['id'], (('0xab', 0, 512),
|
|
('0xfe', '16M', '256k'),
|
|
('0x64', '32736k', '64k')))
|
|
|
|
result = self.create_incremental(validate=False)
|
|
self.assertFalse(result)
|
|
self.hmp_io_writes(drive0['id'], (('0x9a', 0, 512),
|
|
('0x55', '8M', '352k'),
|
|
('0x78', '15872k', '1M')))
|
|
self.create_incremental()
|
|
self.vm.shutdown()
|
|
self.check_backups()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
iotests.main(supported_fmts=['qcow2'])
|