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qemu-e2k/tests/qemu-iotests/124
John Snow 0aef09b9c9 iotests: add transactional failure race test 
Add a regression test for the case found by Vladimir.

Reported-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1478587839-9834-7-git-send-email-jsnow@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
2016-11-14 22:47:34 -05:00

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#!/usr/bin/env python
#
# Tests for incremental drive-backup
#
# Copyright (C) 2015 John Snow for Red Hat, Inc.
#
# Based on 056.
#
# 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 os
import iotests
def io_write_patterns(img, patterns):
for pattern in patterns:
iotests.qemu_io('-c', 'write -P%s %s %s' % pattern, img)
def try_remove(img):
try:
os.remove(img)
except OSError:
pass
def transaction_action(action, **kwargs):
return {
'type': action,
'data': dict((k.replace('_', '-'), v) for k, v in kwargs.iteritems())
}
def transaction_bitmap_clear(node, name, **kwargs):
return transaction_action('block-dirty-bitmap-clear',
node=node, name=name, **kwargs)
def transaction_drive_backup(device, target, **kwargs):
return transaction_action('drive-backup', job_id=device, device=device,
target=target, **kwargs)
class Bitmap:
def __init__(self, name, drive):
self.name = name
self.drive = drive
self.num = 0
self.backups = list()
def base_target(self):
return (self.drive['backup'], None)
def new_target(self, num=None):
if num is None:
num = self.num
self.num = num + 1
base = os.path.join(iotests.test_dir,
"%s.%s." % (self.drive['id'], self.name))
suff = "%i.%s" % (num, self.drive['fmt'])
target = base + "inc" + suff
reference = base + "ref" + suff
self.backups.append((target, reference))
return (target, reference)
def last_target(self):
if self.backups:
return self.backups[-1]
return self.base_target()
def del_target(self):
for image in self.backups.pop():
try_remove(image)
self.num -= 1
def cleanup(self):
for backup in self.backups:
for image in backup:
try_remove(image)
class TestIncrementalBackupBase(iotests.QMPTestCase):
def __init__(self, *args):
super(TestIncrementalBackupBase, self).__init__(*args)
self.bitmaps = list()
self.files = list()
self.drives = list()
self.vm = iotests.VM()
self.err_img = os.path.join(iotests.test_dir, 'err.%s' % iotests.imgfmt)
def setUp(self):
# Create a base image with a distinctive patterning
drive0 = self.add_node('drive0')
self.img_create(drive0['file'], drive0['fmt'])
self.vm.add_drive(drive0['file'])
self.write_default_pattern(drive0['file'])
self.vm.launch()
def write_default_pattern(self, target):
io_write_patterns(target, (('0x41', 0, 512),
('0xd5', '1M', '32k'),
('0xdc', '32M', '124k')))
def add_node(self, node_id, fmt=iotests.imgfmt, path=None, backup=None):
if path is None:
path = os.path.join(iotests.test_dir, '%s.%s' % (node_id, fmt))
if backup is None:
backup = os.path.join(iotests.test_dir,
'%s.full.backup.%s' % (node_id, fmt))
self.drives.append({
'id': node_id,
'file': path,
'backup': backup,
'fmt': fmt })
return self.drives[-1]
def img_create(self, img, fmt=iotests.imgfmt, size='64M',
parent=None, parentFormat=None, **kwargs):
optargs = []
for k,v in kwargs.iteritems():
optargs = optargs + ['-o', '%s=%s' % (k,v)]
args = ['create', '-f', fmt] + optargs + [img, size]
if parent:
if parentFormat is None:
parentFormat = fmt
args = args + ['-b', parent, '-F', parentFormat]
iotests.qemu_img(*args)
self.files.append(img)
def do_qmp_backup(self, error='Input/output error', **kwargs):
res = self.vm.qmp('drive-backup', **kwargs)
self.assert_qmp(res, 'return', {})
return self.wait_qmp_backup(kwargs['device'], error)
def wait_qmp_backup(self, device, error='Input/output error'):
event = self.vm.event_wait(name="BLOCK_JOB_COMPLETED",
match={'data': {'device': device}})
self.assertNotEqual(event, None)
try:
failure = self.dictpath(event, 'data/error')
except AssertionError:
# Backup succeeded.
self.assert_qmp(event, 'data/offset', event['data']['len'])
return True
else:
# Backup failed.
self.assert_qmp(event, 'data/error', error)
return False
def wait_qmp_backup_cancelled(self, device):
event = self.vm.event_wait(name='BLOCK_JOB_CANCELLED',
match={'data': {'device': device}})
self.assertNotEqual(event, None)
def create_anchor_backup(self, drive=None):
if drive is None:
drive = self.drives[-1]
res = self.do_qmp_backup(job_id=drive['id'],
device=drive['id'], sync='full',
format=drive['fmt'], target=drive['backup'])
self.assertTrue(res)
self.files.append(drive['backup'])
return drive['backup']
def make_reference_backup(self, bitmap=None):
if bitmap is None:
bitmap = self.bitmaps[-1]
_, reference = bitmap.last_target()
res = self.do_qmp_backup(job_id=bitmap.drive['id'],
device=bitmap.drive['id'], sync='full',
format=bitmap.drive['fmt'], target=reference)
self.assertTrue(res)
def add_bitmap(self, name, drive, **kwargs):
bitmap = Bitmap(name, drive)
self.bitmaps.append(bitmap)
result = self.vm.qmp('block-dirty-bitmap-add', node=drive['id'],
name=bitmap.name, **kwargs)
self.assert_qmp(result, 'return', {})
return bitmap
def prepare_backup(self, bitmap=None, parent=None):
if bitmap is None:
bitmap = self.bitmaps[-1]
if parent is None:
parent, _ = bitmap.last_target()
target, _ = bitmap.new_target()
self.img_create(target, bitmap.drive['fmt'], parent=parent)
return target
def create_incremental(self, bitmap=None, parent=None,
parentFormat=None, validate=True):
if bitmap is None:
bitmap = self.bitmaps[-1]
if parent is None:
parent, _ = bitmap.last_target()
target = self.prepare_backup(bitmap, parent)
res = self.do_qmp_backup(job_id=bitmap.drive['id'],
device=bitmap.drive['id'],
sync='incremental', bitmap=bitmap.name,
format=bitmap.drive['fmt'], target=target,
mode='existing')
if not res:
bitmap.del_target();
self.assertFalse(validate)
else:
self.make_reference_backup(bitmap)
return res
def check_backups(self):
for bitmap in self.bitmaps:
for incremental, reference in bitmap.backups:
self.assertTrue(iotests.compare_images(incremental, reference))
last = bitmap.last_target()[0]
self.assertTrue(iotests.compare_images(last, bitmap.drive['file']))
def hmp_io_writes(self, drive, patterns):
for pattern in patterns:
self.vm.hmp_qemu_io(drive, 'write -P%s %s %s' % pattern)
self.vm.hmp_qemu_io(drive, 'flush')
def do_incremental_simple(self, **kwargs):
self.create_anchor_backup()
self.add_bitmap('bitmap0', self.drives[0], **kwargs)
# Sanity: Create a "hollow" incremental backup
self.create_incremental()
# Three writes: One complete overwrite, one new segment,
# and one partial overlap.
self.hmp_io_writes(self.drives[0]['id'], (('0xab', 0, 512),
('0xfe', '16M', '256k'),
('0x64', '32736k', '64k')))
self.create_incremental()
# Three more writes, one of each kind, like above
self.hmp_io_writes(self.drives[0]['id'], (('0x9a', 0, 512),
('0x55', '8M', '352k'),
('0x78', '15872k', '1M')))
self.create_incremental()
self.vm.shutdown()
self.check_backups()
def tearDown(self):
self.vm.shutdown()
for bitmap in self.bitmaps:
bitmap.cleanup()
for filename in self.files:
try_remove(filename)
class TestIncrementalBackup(TestIncrementalBackupBase):
def test_incremental_simple(self):
'''
Test: Create and verify three incremental backups.
Create a bitmap and a full backup before VM execution begins,
then create a series of three incremental backups "during execution,"
i.e.; after IO requests begin modifying the drive.
'''
return self.do_incremental_simple()
def test_small_granularity(self):
'''
Test: Create and verify backups made with a small granularity bitmap.
Perform the same test as test_incremental_simple, but with a granularity
of only 32KiB instead of the present default of 64KiB.
'''
return self.do_incremental_simple(granularity=32768)
def test_large_granularity(self):
'''
Test: Create and verify backups made with a large granularity bitmap.
Perform the same test as test_incremental_simple, but with a granularity
of 128KiB instead of the present default of 64KiB.
'''
return self.do_incremental_simple(granularity=131072)
def test_larger_cluster_target(self):
'''
Test: Create and verify backups made to a larger cluster size target.
With a default granularity of 64KiB, verify that backups made to a
larger cluster size target of 128KiB without a backing file works.
'''
drive0 = self.drives[0]
# Create a cluster_size=128k full backup / "anchor" backup
self.img_create(drive0['backup'], cluster_size='128k')
self.assertTrue(self.do_qmp_backup(device=drive0['id'], sync='full',
format=drive0['fmt'],
target=drive0['backup'],
mode='existing'))
# Create bitmap and dirty it with some new writes.
# overwrite [32736, 32799] which will dirty bitmap clusters at
# 32M-64K and 32M. 32M+64K will be left undirtied.
bitmap0 = self.add_bitmap('bitmap0', drive0)
self.hmp_io_writes(drive0['id'],
(('0xab', 0, 512),
('0xfe', '16M', '256k'),
('0x64', '32736k', '64k')))
# Prepare a cluster_size=128k backup target without a backing file.
(target, _) = bitmap0.new_target()
self.img_create(target, bitmap0.drive['fmt'], cluster_size='128k')
# Perform Incremental Backup
self.assertTrue(self.do_qmp_backup(device=bitmap0.drive['id'],
sync='incremental',
bitmap=bitmap0.name,
format=bitmap0.drive['fmt'],
target=target,
mode='existing'))
self.make_reference_backup(bitmap0)
# Add the backing file, then compare and exit.
iotests.qemu_img('rebase', '-f', drive0['fmt'], '-u', '-b',
drive0['backup'], '-F', drive0['fmt'], target)
self.vm.shutdown()
self.check_backups()
def test_incremental_transaction(self):
'''Test: Verify backups made from transactionally created bitmaps.
Create a bitmap "before" VM execution begins, then create a second
bitmap AFTER writes have already occurred. Use transactions to create
a full backup and synchronize both bitmaps to this backup.
Create an incremental backup through both bitmaps and verify that
both backups match the current drive0 image.
'''
drive0 = self.drives[0]
bitmap0 = self.add_bitmap('bitmap0', drive0)
self.hmp_io_writes(drive0['id'], (('0xab', 0, 512),
('0xfe', '16M', '256k'),
('0x64', '32736k', '64k')))
bitmap1 = self.add_bitmap('bitmap1', drive0)
result = self.vm.qmp('transaction', actions=[
transaction_bitmap_clear(bitmap0.drive['id'], bitmap0.name),
transaction_bitmap_clear(bitmap1.drive['id'], bitmap1.name),
transaction_drive_backup(drive0['id'], drive0['backup'],
sync='full', format=drive0['fmt'])
])
self.assert_qmp(result, 'return', {})
self.wait_until_completed(drive0['id'])
self.files.append(drive0['backup'])
self.hmp_io_writes(drive0['id'], (('0x9a', 0, 512),
('0x55', '8M', '352k'),
('0x78', '15872k', '1M')))
# Both bitmaps should be correctly in sync.
self.create_incremental(bitmap0)
self.create_incremental(bitmap1)
self.vm.shutdown()
self.check_backups()
def do_transaction_failure_test(self, race=False):
# Create a second drive, with pattern:
drive1 = self.add_node('drive1')
self.img_create(drive1['file'], drive1['fmt'])
io_write_patterns(drive1['file'], (('0x14', 0, 512),
('0x5d', '1M', '32k'),
('0xcd', '32M', '124k')))
# Create a blkdebug interface to this img as 'drive1'
result = self.vm.qmp('blockdev-add',
node_name=drive1['id'],
driver=drive1['fmt'],
file={
'driver': 'blkdebug',
'image': {
'driver': 'file',
'filename': drive1['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', {})
# Create bitmaps and full backups for both drives
drive0 = self.drives[0]
dr0bm0 = self.add_bitmap('bitmap0', drive0)
dr1bm0 = self.add_bitmap('bitmap0', drive1)
self.create_anchor_backup(drive0)
self.create_anchor_backup(drive1)
self.assert_no_active_block_jobs()
self.assertFalse(self.vm.get_qmp_events(wait=False))
# Emulate some writes
if not race:
self.hmp_io_writes(drive0['id'], (('0xab', 0, 512),
('0xfe', '16M', '256k'),
('0x64', '32736k', '64k')))
self.hmp_io_writes(drive1['id'], (('0xba', 0, 512),
('0xef', '16M', '256k'),
('0x46', '32736k', '64k')))
# Create incremental backup targets
target0 = self.prepare_backup(dr0bm0)
target1 = self.prepare_backup(dr1bm0)
# Ask for a new incremental backup per-each drive,
# expecting drive1's backup to fail. In the 'race' test,
# we expect drive1 to attempt to cancel the empty drive0 job.
transaction = [
transaction_drive_backup(drive0['id'], target0, sync='incremental',
format=drive0['fmt'], mode='existing',
bitmap=dr0bm0.name),
transaction_drive_backup(drive1['id'], target1, sync='incremental',
format=drive1['fmt'], mode='existing',
bitmap=dr1bm0.name)
]
result = self.vm.qmp('transaction', actions=transaction,
properties={'completion-mode': 'grouped'} )
self.assert_qmp(result, 'return', {})
# Observe that drive0's backup is cancelled and drive1 completes with
# an error.
self.wait_qmp_backup_cancelled(drive0['id'])
self.assertFalse(self.wait_qmp_backup(drive1['id']))
error = self.vm.event_wait('BLOCK_JOB_ERROR')
self.assert_qmp(error, 'data', {'device': drive1['id'],
'action': 'report',
'operation': 'read'})
self.assertFalse(self.vm.get_qmp_events(wait=False))
self.assert_no_active_block_jobs()
# Delete drive0's successful target and eliminate our record of the
# unsuccessful drive1 target.
dr0bm0.del_target()
dr1bm0.del_target()
if race:
# Don't re-run the transaction, we only wanted to test the race.
self.vm.shutdown()
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'])
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