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iotests: 124 - transactional failure test 

Use a transaction to request an incremental backup across two drives.
Coerce one of the jobs to fail, and then re-run the transaction.

Verify that no bitmap data was lost due to the partial transaction
failure.

To support the 'err-cancel' QMP argument name it's necessary for
transaction_action() to convert underscores in Python argument names
to hyphens for QMP argument names.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1446765200-3054-14-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
John Snow 2015-11-05 18:13:19 -05:00 committed by Kevin Wolf
parent 94d16a640a
commit fc6c796ff2
2 changed files with 130 additions and 4 deletions
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130
tests/qemu-iotests/124
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@ -39,7 +39,7 @@ def try_remove(img):
def transaction_action(action, **kwargs):
return {
'type': action,
'data': kwargs
'data': dict((k.replace('_', '-'), v) for k, v in kwargs.iteritems())
}
@ -139,9 +139,12 @@ class TestIncrementalBackup(iotests.QMPTestCase):
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': kwargs['device']}})
match={'data': {'device': device}})
self.assertNotEqual(event, None)
try:
@ -156,6 +159,12 @@ class TestIncrementalBackup(iotests.QMPTestCase):
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]
@ -375,6 +384,123 @@ class TestIncrementalBackup(iotests.QMPTestCase):
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.
'''
# 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', options={
'id': 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
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:
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. Then re-run the same transaction.
dr0bm0.del_target()
dr1bm0.del_target()
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_sync_dirty_bitmap_missing(self):
self.assert_no_active_block_jobs()
self.files.append(self.err_img)

4
tests/qemu-iotests/124.out
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@ -1,5 +1,5 @@
........
.........
----------------------------------------------------------------------
Ran 8 tests
Ran 9 tests
OK