59fc5d844f
Test what happens if you fiddle with the granularity. Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1429314609-29776-22-git-send-email-jsnow@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
364 lines
12 KiB
Python
364 lines
12 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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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 TestIncrementalBackup(iotests.QMPTestCase):
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def setUp(self):
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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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# 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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io_write_patterns(drive0['file'], (('0x41', 0, 512),
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('0xd5', '1M', '32k'),
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('0xdc', '32M', '124k')))
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self.vm.launch()
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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):
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if parent:
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if parentFormat is None:
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parentFormat = fmt
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iotests.qemu_img('create', '-f', fmt, img, size,
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'-b', parent, '-F', parentFormat)
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else:
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iotests.qemu_img('create', '-f', fmt, img, size)
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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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event = self.vm.event_wait(name="BLOCK_JOB_COMPLETED",
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match={'data': {'device': kwargs['device']}})
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self.assertIsNotNone(event)
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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 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(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(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(device=bitmap.drive['id'],
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sync='dirty-bitmap', 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 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_incremental_failure(self):
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'''Test: Verify backups made after a failure are correct.
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Simulate a failure during an incremental backup block job,
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emulate additional writes, then create another incremental backup
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afterwards and verify that the backup created is correct.
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'''
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# Create a blkdebug interface to this img as 'drive1',
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# but don't actually create a new image.
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drive1 = self.add_node('drive1', self.drives[0]['fmt'],
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path=self.drives[0]['file'],
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backup=self.drives[0]['backup'])
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result = self.vm.qmp('blockdev-add', options={
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'id': 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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self.create_anchor_backup(self.drives[0])
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self.add_bitmap('bitmap0', drive1)
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# Note: at this point, during a normal execution,
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# Assume that the VM resumes and begins issuing IO requests here.
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self.hmp_io_writes(drive1['id'], (('0xab', 0, 512),
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('0xfe', '16M', '256k'),
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('0x64', '32736k', '64k')))
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result = self.create_incremental(validate=False)
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self.assertFalse(result)
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self.hmp_io_writes(drive1['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 test_sync_dirty_bitmap_missing(self):
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self.assert_no_active_block_jobs()
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self.files.append(self.err_img)
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result = self.vm.qmp('drive-backup', device=self.drives[0]['id'],
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sync='dirty-bitmap', format=self.drives[0]['fmt'],
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target=self.err_img)
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self.assert_qmp(result, 'error/class', 'GenericError')
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def test_sync_dirty_bitmap_not_found(self):
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self.assert_no_active_block_jobs()
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self.files.append(self.err_img)
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result = self.vm.qmp('drive-backup', device=self.drives[0]['id'],
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sync='dirty-bitmap', bitmap='unknown',
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format=self.drives[0]['fmt'], target=self.err_img)
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self.assert_qmp(result, 'error/class', 'GenericError')
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def test_sync_dirty_bitmap_bad_granularity(self):
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'''
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Test: Test what happens if we provide an improper granularity.
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The granularity must always be a power of 2.
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'''
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self.assert_no_active_block_jobs()
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self.assertRaises(AssertionError, self.add_bitmap,
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'bitmap0', self.drives[0],
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granularity=64000)
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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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if __name__ == '__main__':
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iotests.main(supported_fmts=['qcow2'])
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