throttle: test that snapshots move the throttling configuration

If a snapshot is performed on a device that has I/O limits they should
be moved to the target image (the new active layer).

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/096

@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+#
+# Test that snapshots move the throttling configuration to the active
+# layer
+#
+# Copyright (C) 2015 Igalia, S.L.
+#
+# 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
+import os
+
+class TestLiveSnapshot(iotests.QMPTestCase):
+    base_img = os.path.join(iotests.test_dir, 'base.img')
+    target_img = os.path.join(iotests.test_dir, 'target.img')
+    group = 'mygroup'
+    iops = 6000
+    iops_size = 1024
+
+    def setUp(self):
+        opts = []
+        opts.append('node-name=base')
+        opts.append('throttling.group=%s' % self.group)
+        opts.append('throttling.iops-total=%d' % self.iops)
+        opts.append('throttling.iops-size=%d' % self.iops_size)
+        iotests.qemu_img('create', '-f', iotests.imgfmt, self.base_img, '100M')
+        self.vm = iotests.VM().add_drive(self.base_img, ','.join(opts))
+        self.vm.launch()
+
+    def tearDown(self):
+        self.vm.shutdown()
+        os.remove(self.base_img)
+        os.remove(self.target_img)
+
+    def checkConfig(self, active_layer):
+        result = self.vm.qmp('query-named-block-nodes')
+        for r in result['return']:
+            if r['node-name'] == active_layer:
+                self.assertEqual(r['group'], self.group)
+                self.assertEqual(r['iops'], self.iops)
+                self.assertEqual(r['iops_size'], self.iops_size)
+            else:
+                self.assertFalse(r.has_key('group'))
+                self.assertEqual(r['iops'], 0)
+                self.assertFalse(r.has_key('iops_size'))
+
+    def testSnapshot(self):
+        self.checkConfig('base')
+        self.vm.qmp('blockdev-snapshot-sync',
+                    node_name = 'base',
+                    snapshot_node_name = 'target',
+                    snapshot_file = self.target_img,
+                    format = iotests.imgfmt)
+        self.checkConfig('target')
+
+if __name__ == '__main__':
+    iotests.main(supported_fmts=['qcow2'])

tests/qemu-iotests/096.out

@@ -0,0 +1,5 @@
+.
+----------------------------------------------------------------------
+Ran 1 tests
+
+OK

tests/qemu-iotests/group

@@ -102,6 +102,7 @@
 093 auto
 094 rw auto quick
 095 rw auto quick
+096 rw auto quick
 097 rw auto backing
 098 rw auto backing quick
 099 rw auto quick