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.
Signed-off-by: John Snow <js...@redhat.com>
---
tests/qemu-iotests/124 | 119 +++++++++++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/124.out | 4 +-
2 files changed, 121 insertions(+), 2 deletions(-)
diff --git a/tests/qemu-iotests/124 b/tests/qemu-iotests/124
index 4afdca1..48571a5 100644
--- a/tests/qemu-iotests/124
+++ b/tests/qemu-iotests/124
@@ -331,6 +331,125 @@ class TestIncrementalBackup(iotests.QMPTestCase):
self.create_incremental()
+ 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_full_backup(drive0)
+ self.create_full_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 = [
+ {
+ 'type': 'drive-backup',
+ 'data': { 'device': drive0['id'],
+ 'sync': 'dirty-bitmap',
+ 'format': drive0['fmt'],
+ 'target': target0,
+ 'mode': 'existing',
+ 'bitmap': dr0bm0.name },
+ },
+ {
+ 'type': 'drive-backup',
+ 'data': { 'device': drive1['id'],
+ 'sync': 'dirty-bitmap',
+ 'format': drive1['fmt'],
+ 'target': target1,
+ 'mode': 'existing',
+ 'bitmap': dr1bm0.name }
+ }
+ ]
+ result = self.vm.qmp('transaction', actions=transaction)
+ self.assert_qmp(result, 'return', {})
+
+ # Observe that drive0's backup completes, but drive1's does not.
+ # Consume drive1's error and ensure all pending actions are completed.
+ self.wait_incremental(dr0bm0, validate=True)
+ self.wait_incremental(dr1bm0, validate=False)
+ 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) backup and create two new empty
+ # targets to re-run the transaction.
+ dr0bm0.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)
+ self.assert_qmp(result, 'return', {})
+ # Both should complete successfully this time.
+ self.wait_incremental(dr0bm0, 'drive0')
+ self.wait_incremental(dr1bm0, 'drive1')
