bitmaps patches for 2021-02-12

- add 'transform' member to manipulate bitmaps across migration
 - work towards better error handling during bdrv_open
 -----BEGIN PGP SIGNATURE-----
 
 iQEzBAABCAAdFiEEccLMIrHEYCkn0vOqp6FrSiUnQ2oFAmAnDQsACgkQp6FrSiUn
 Q2qc5Qf/SKVdpX4j7OnHF6sBuf/8LVWz4KazSqEU0ohazBJmafgJpH2EA5pXMXR4
 frZDWeanGmhj1MjMkta/++uvEBU/TMpW2z98mZvjErteXdnRQAlII/hOCI+QZJvg
 viQ5t1EyrkyXzUePOjs+AwqA5KHWbCKt6QqyItQ78HvI23sw/fuvHj0G67KbVzXZ
 VcSrVr0J7PXnZV/hWfg+C+Nn9Ro9tsVdn79awLYVQ7/SDro3hzylpcHMQaHMK2oe
 mX4D2kNq7s21E27Zb6vlknUhQPkMdETk0gfEbpn7sTVMEc58GRLC7Tqfx7l0JIFK
 5izVyA5vndKVxDGYPkbDK6VL2uDg4A==
 =+Epy
 -----END PGP SIGNATURE-----

Merge remote-tracking branch 'remotes/ericb/tags/pull-bitmaps-2021-02-12' into staging

bitmaps patches for 2021-02-12

- add 'transform' member to manipulate bitmaps across migration
- work towards better error handling during bdrv_open

# gpg: Signature made Fri 12 Feb 2021 23:19:39 GMT
# gpg:                using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>" [full]
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>" [full]
# gpg:                 aka "[jpeg image of size 6874]" [full]
# Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 436A

* remotes/ericb/tags/pull-bitmaps-2021-02-12:
  block: use return status of bdrv_append()
  block: return status from bdrv_append and friends
  qemu-iotests: 300: Add test case for modifying persistence of bitmap
  migration: dirty-bitmap: Allow control of bitmap persistence
  migration: dirty-bitmap: Use struct for alias map inner members

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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

tests/test-bdrv-graph-mod.c

@@ -101,7 +101,7 @@ static BlockDriverState *pass_through_node(const char *name)
  */
 static void test_update_perm_tree(void)
 {
-    Error *local_err = NULL;
+    int ret;
 
     BlockBackend *root = blk_new(qemu_get_aio_context(),
                                  BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ,
@@ -114,8 +114,8 @@ static void test_update_perm_tree(void)
     bdrv_attach_child(filter, bs, "child", &child_of_bds,
                       BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, &error_abort);
 
-    bdrv_append(filter, bs, &local_err);
-    error_free_or_abort(&local_err);
+    ret = bdrv_append(filter, bs, NULL);
+    g_assert_cmpint(ret, <, 0);
 
     blk_unref(root);
 }