iotests/264: add backup-cancel test-case

Check that cancel doesn't wait for 10s of nbd reconnect timeout.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210205163720.887197-11-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

tests/qemu-iotests/264

@@ -94,13 +94,7 @@ class TestNbdReconnect(iotests.QMPTestCase):
             result = self.vm.qmp('blockdev-del', node_name='backup0')
             self.assert_qmp(result, 'return', {})
 
-    def test_mirror_cancel(self):
-        # Mirror speed limit doesn't work well enough, it seems that mirror
-        # will run many parallel requests anyway. MAX_IN_FLIGHT is 16 and
-        # MAX_IO_BYTES is 1M in mirror.c, so let's use 20M disk.
-        self.init_vm(20 * 1024 * 1024)
-        self.start_job('blockdev-mirror')
-
+    def cancel_job(self):
         result = self.vm.qmp('block-job-cancel', device='drive0')
         self.assert_qmp(result, 'return', {})
 
@@ -109,6 +103,19 @@ class TestNbdReconnect(iotests.QMPTestCase):
         delta_t = time.time() - start_t
         self.assertTrue(delta_t < 2.0)
 
+    def test_mirror_cancel(self):
+        # Mirror speed limit doesn't work well enough, it seems that mirror
+        # will run many parallel requests anyway. MAX_IN_FLIGHT is 16 and
+        # MAX_IO_BYTES is 1M in mirror.c, so let's use 20M disk.
+        self.init_vm(20 * 1024 * 1024)
+        self.start_job('blockdev-mirror')
+        self.cancel_job()
+
+    def test_backup_cancel(self):
+        self.init_vm(5 * 1024 * 1024)
+        self.start_job('blockdev-backup')
+        self.cancel_job()
+
 
 if __name__ == '__main__':
     iotests.main(supported_fmts=['qcow2'])

tests/qemu-iotests/264.out

-..
+...
 ----------------------------------------------------------------------
-Ran 2 tests
+Ran 3 tests
 
 OK