qemu-iotests: 300: Add test case for modifying persistence of bitmap

Verify that the modification of the bitmap persistence over migration
which is controlled via BitmapMigrationBitmapAliasTransform works
properly.

Based on TestCrossAliasMigration

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Message-Id: <d9c8e9827e9b6001b2dd1b92e64aab858e6d2a86.1613150869.git.pkrempa@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: Adjust test for explicit read_zeroes=False]
Signed-off-by: Eric Blake <eblake@redhat.com>

tests/qemu-iotests/300

@@ -600,6 +600,99 @@ class TestCrossAliasMigration(TestDirtyBitmapMigration):
         self.verify_dest_has_all_bitmaps()
         self.verify_dest_error(None)
 
+class TestAliasTransformMigration(TestDirtyBitmapMigration):
+    """
+    Tests the 'transform' option which modifies bitmap persistence on migration.
+    """
+
+    src_node_name = 'node-a'
+    dst_node_name = 'node-b'
+    src_bmap_name = 'bmap-a'
+    dst_bmap_name = 'bmap-b'
+
+    def setUp(self) -> None:
+        TestDirtyBitmapMigration.setUp(self)
+
+        # Now create another block device and let both have two bitmaps each
+        result = self.vm_a.qmp('blockdev-add',
+                               node_name='node-b', driver='null-co',
+                               read_zeroes=False)
+        self.assert_qmp(result, 'return', {})
+
+        result = self.vm_b.qmp('blockdev-add',
+                               node_name='node-a', driver='null-co',
+                               read_zeroes=False)
+        self.assert_qmp(result, 'return', {})
+
+        bmaps_to_add = (('node-a', 'bmap-b'),
+                        ('node-b', 'bmap-a'),
+                        ('node-b', 'bmap-b'))
+
+        for (node, bmap) in bmaps_to_add:
+            result = self.vm_a.qmp('block-dirty-bitmap-add',
+                                   node=node, name=bmap)
+            self.assert_qmp(result, 'return', {})
+
+    @staticmethod
+    def transform_mapping() -> BlockBitmapMapping:
+        return [
+            {
+                'node-name': 'node-a',
+                'alias': 'node-a',
+                'bitmaps': [
+                    {
+                        'name': 'bmap-a',
+                        'alias': 'bmap-a',
+                        'transform':
+                            {
+                                'persistent': True
+                            }
+                    },
+                    {
+                        'name': 'bmap-b',
+                        'alias': 'bmap-b'
+                    }
+                ]
+            },
+            {
+                'node-name': 'node-b',
+                'alias': 'node-b',
+                'bitmaps': [
+                    {
+                        'name': 'bmap-a',
+                        'alias': 'bmap-a'
+                    },
+                    {
+                        'name': 'bmap-b',
+                        'alias': 'bmap-b'
+                    }
+                ]
+            }
+        ]
+
+    def verify_dest_bitmap_state(self) -> None:
+        bitmaps = self.vm_b.query_bitmaps()
+
+        for node in bitmaps:
+            bitmaps[node] = sorted(((bmap['name'], bmap['persistent']) for bmap in bitmaps[node]))
+
+        self.assertEqual(bitmaps,
+                         {'node-a': [('bmap-a', True), ('bmap-b', False)],
+                          'node-b': [('bmap-a', False), ('bmap-b', False)]})
+
+    def test_transform_on_src(self) -> None:
+        self.set_mapping(self.vm_a, self.transform_mapping())
+
+        self.migrate()
+        self.verify_dest_bitmap_state()
+        self.verify_dest_error(None)
+
+    def test_transform_on_dst(self) -> None:
+        self.set_mapping(self.vm_b, self.transform_mapping())
+
+        self.migrate()
+        self.verify_dest_bitmap_state()
+        self.verify_dest_error(None)
 
 if __name__ == '__main__':
     iotests.main(supported_protocols=['file'])

tests/qemu-iotests/300.out

@@ -1,5 +1,5 @@
-.....................................
+.......................................
 ----------------------------------------------------------------------
-Ran 37 tests
+Ran 39 tests
 
 OK