iotests: test external snapshot with bitmap copying

This test shows that external snapshots and incremental backups are
friends.
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: NJohn Snow <jsnow@redhat.com>
Message-id: 20190517152111.206494-3-vsementsov@virtuozzo.com
Signed-off-by: NJohn Snow <jsnow@redhat.com>

tests/qemu-iotests/254

+#!/usr/bin/env python
+#
+# Test external snapshot with bitmap copying.
+#
+# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
+#
+# 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 iotests
+from iotests import qemu_img_create, file_path, log
+
+disk, top = file_path('disk', 'top')
+size = 1024 * 1024
+
+qemu_img_create('-f', iotests.imgfmt, disk, str(size))
+
+vm = iotests.VM().add_drive(disk, opts='node-name=base')
+vm.launch()
+
+vm.qmp_log('block-dirty-bitmap-add', node='drive0', name='bitmap0')
+
+vm.hmp_qemu_io('drive0', 'write 0 512K')
+
+vm.qmp_log('transaction', indent=2, actions=[
+    {'type': 'blockdev-snapshot-sync',
+     'data': {'device': 'drive0', 'snapshot-file': top,
+              'snapshot-node-name': 'snap'}},
+    {'type': 'block-dirty-bitmap-add',
+     'data': {'node': 'snap', 'name': 'bitmap0'}},
+    {'type': 'block-dirty-bitmap-merge',
+     'data': {'node': 'snap', 'target': 'bitmap0',
+              'bitmaps': [{'node': 'base', 'name': 'bitmap0'}]}}
+], filters=[iotests.filter_qmp_testfiles])
+
+result = vm.qmp('query-block')['return'][0]
+log("query-block: device = {}, node-name = {}, dirty-bitmaps:".format(
+    result['device'], result['inserted']['node-name']))
+log(result['dirty-bitmaps'], indent=2)
+
+vm.shutdown()

tests/qemu-iotests/254.out

+{"execute": "block-dirty-bitmap-add", "arguments": {"name": "bitmap0", "node": "drive0"}}
+{"return": {}}
+{
+  "execute": "transaction",
+  "arguments": {
+    "actions": [
+      {
+        "data": {
+          "device": "drive0",
+          "snapshot-file": "TEST_DIR/PID-top",
+          "snapshot-node-name": "snap"
+        },
+        "type": "blockdev-snapshot-sync"
+      },
+      {
+        "data": {
+          "name": "bitmap0",
+          "node": "snap"
+        },
+        "type": "block-dirty-bitmap-add"
+      },
+      {
+        "data": {
+          "bitmaps": [
+            {
+              "name": "bitmap0",
+              "node": "base"
+            }
+          ],
+          "node": "snap",
+          "target": "bitmap0"
+        },
+        "type": "block-dirty-bitmap-merge"
+      }
+    ]
+  }
+}
+{
+  "return": {}
+}
+query-block: device = drive0, node-name = snap, dirty-bitmaps:
+[
+  {
+    "busy": false,
+    "count": 524288,
+    "granularity": 65536,
+    "name": "bitmap0",
+    "persistent": false,
+    "recording": true,
+    "status": "active"
+  }
+]

tests/qemu-iotests/group

@@ -264,3 +264,4 @@
 249 rw auto quick
 252 rw auto backing quick
 253 rw auto quick
+254 rw auto backing quick