iotests: Add test for active mirroring

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 20180613181823.13618-15-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

tests/qemu-iotests/151

+#!/usr/bin/env python
+#
+# Tests for active mirroring
+#
+# Copyright (C) 2018 Red Hat, Inc.
+#
+# 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 os
+import iotests
+from iotests import qemu_img
+
+source_img = os.path.join(iotests.test_dir, 'source.' + iotests.imgfmt)
+target_img = os.path.join(iotests.test_dir, 'target.' + iotests.imgfmt)
+
+class TestActiveMirror(iotests.QMPTestCase):
+    image_len = 128 * 1024 * 1024 # MB
+    potential_writes_in_flight = True
+
+    def setUp(self):
+        qemu_img('create', '-f', iotests.imgfmt, source_img, '128M')
+        qemu_img('create', '-f', iotests.imgfmt, target_img, '128M')
+
+        blk_source = {'id': 'source',
+                      'if': 'none',
+                      'node-name': 'source-node',
+                      'driver': iotests.imgfmt,
+                      'file': {'driver': 'file',
+                               'filename': source_img}}
+
+        blk_target = {'node-name': 'target-node',
+                      'driver': iotests.imgfmt,
+                      'file': {'driver': 'file',
+                               'filename': target_img}}
+
+        self.vm = iotests.VM()
+        self.vm.add_drive_raw(self.vm.qmp_to_opts(blk_source))
+        self.vm.add_blockdev(self.vm.qmp_to_opts(blk_target))
+        self.vm.add_device('virtio-blk,drive=source')
+        self.vm.launch()
+
+    def tearDown(self):
+        self.vm.shutdown()
+
+        if not self.potential_writes_in_flight:
+            self.assertTrue(iotests.compare_images(source_img, target_img),
+                            'mirror target does not match source')
+
+        os.remove(source_img)
+        os.remove(target_img)
+
+    def doActiveIO(self, sync_source_and_target):
+        # Fill the source image
+        self.vm.hmp_qemu_io('source',
+                            'write -P 1 0 %i' % self.image_len);
+
+        # Start some background requests
+        for offset in range(1 * self.image_len / 8, 3 * self.image_len / 8, 1024 * 1024):
+            self.vm.hmp_qemu_io('source', 'aio_write -P 2 %i 1M' % offset)
+        for offset in range(2 * self.image_len / 8, 3 * self.image_len / 8, 1024 * 1024):
+            self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
+
+        # Start the block job
+        result = self.vm.qmp('blockdev-mirror',
+                             job_id='mirror',
+                             filter_node_name='mirror-node',
+                             device='source-node',
+                             target='target-node',
+                             sync='full',
+                             copy_mode='write-blocking')
+        self.assert_qmp(result, 'return', {})
+
+        # Start some more requests
+        for offset in range(3 * self.image_len / 8, 5 * self.image_len / 8, 1024 * 1024):
+            self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
+        for offset in range(4 * self.image_len / 8, 5 * self.image_len / 8, 1024 * 1024):
+            self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
+
+        # Wait for the READY event
+        self.wait_ready(drive='mirror')
+
+        # Now start some final requests; all of these (which land on
+        # the source) should be settled using the active mechanism.
+        # The mirror code itself asserts that the source BDS's dirty
+        # bitmap will stay clean between READY and COMPLETED.
+        for offset in range(5 * self.image_len / 8, 7 * self.image_len / 8, 1024 * 1024):
+            self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
+        for offset in range(6 * self.image_len / 8, 7 * self.image_len / 8, 1024 * 1024):
+            self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
+
+        if sync_source_and_target:
+            # If source and target should be in sync after the mirror,
+            # we have to flush before completion
+            self.vm.hmp_qemu_io('source', 'aio_flush')
+            self.potential_writes_in_flight = False
+
+        self.complete_and_wait(drive='mirror', wait_ready=False)
+
+    def testActiveIO(self):
+        self.doActiveIO(False)
+
+    def testActiveIOFlushed(self):
+        self.doActiveIO(True)
+
+
+
+if __name__ == '__main__':
+    iotests.main(supported_fmts=['qcow2', 'raw'])

tests/qemu-iotests/151.out

+..
+----------------------------------------------------------------------
+Ran 2 tests
+
+OK

tests/qemu-iotests/group

@@ -157,6 +157,7 @@
 148 rw auto quick
 149 rw auto sudo
 150 rw auto quick
+151 rw auto
 152 rw auto quick
 153 rw auto quick
 154 rw auto backing quick