iotests: Test replacing files with x-blockdev-reopen

This patch adds new tests in which we use x-blockdev-reopen to change
bs->file

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20210610120537.196183-10-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/245

@@ -79,7 +79,7 @@ class TestBlockdevReopen(iotests.QMPTestCase):
         for line in log.split("\n"):
             if line.startswith("Pattern verification failed"):
                 raise Exception("%s (command #%d)" % (line, found))
-            if re.match("read .*/.* bytes at offset", line):
+            if re.match("(read|wrote) .*/.* bytes at offset", line):
                 found += 1
         self.assertEqual(found, self.total_io_cmds,
                          "Expected output of %d qemu-io commands, found %d" %
@@ -537,6 +537,113 @@ class TestBlockdevReopen(iotests.QMPTestCase):
         result = self.vm.qmp('blockdev-del', conv_keys = True, node_name = 'bv')
         self.assert_qmp(result, 'return', {})
 
+    # Replace the protocol layer ('file' parameter) of a disk image
+    def test_replace_file(self):
+        # Create two small raw images and add them to a running VM
+        qemu_img('create', '-f', 'raw', hd_path[0], '10k')
+        qemu_img('create', '-f', 'raw', hd_path[1], '10k')
+
+        hd0_opts = {'driver': 'file', 'node-name': 'hd0-file', 'filename':  hd_path[0] }
+        hd1_opts = {'driver': 'file', 'node-name': 'hd1-file', 'filename':  hd_path[1] }
+
+        result = self.vm.qmp('blockdev-add', conv_keys = False, **hd0_opts)
+        self.assert_qmp(result, 'return', {})
+        result = self.vm.qmp('blockdev-add', conv_keys = False, **hd1_opts)
+        self.assert_qmp(result, 'return', {})
+
+        # Add a raw format layer that uses hd0-file as its protocol layer
+        opts = {'driver': 'raw', 'node-name': 'hd', 'file': 'hd0-file'}
+
+        result = self.vm.qmp('blockdev-add', conv_keys = False, **opts)
+        self.assert_qmp(result, 'return', {})
+
+        # Fill the image with data
+        self.run_qemu_io("hd", "read  -P 0 0 10k")
+        self.run_qemu_io("hd", "write -P 0xa0 0 10k")
+
+        # Replace hd0-file with hd1-file and fill it with (different) data
+        self.reopen(opts, {'file': 'hd1-file'})
+        self.run_qemu_io("hd", "read  -P 0 0 10k")
+        self.run_qemu_io("hd", "write -P 0xa1 0 10k")
+
+        # Use hd0-file again and check that it contains the expected data
+        self.reopen(opts, {'file': 'hd0-file'})
+        self.run_qemu_io("hd", "read  -P 0xa0 0 10k")
+
+        # And finally do the same with hd1-file
+        self.reopen(opts, {'file': 'hd1-file'})
+        self.run_qemu_io("hd", "read  -P 0xa1 0 10k")
+
+    # Insert (and remove) a throttle filter
+    def test_insert_throttle_filter(self):
+        # Add an image to the VM
+        hd0_opts = hd_opts(0)
+        result = self.vm.qmp('blockdev-add', conv_keys = False, **hd0_opts)
+        self.assert_qmp(result, 'return', {})
+
+        # Create a throttle-group object
+        opts = { 'qom-type': 'throttle-group', 'id': 'group0',
+                 'limits': { 'iops-total': 1000 } }
+        result = self.vm.qmp('object-add', conv_keys = False, **opts)
+        self.assert_qmp(result, 'return', {})
+
+        # Add a throttle filter with the group that we just created.
+        # The filter is not used by anyone yet
+        opts = { 'driver': 'throttle', 'node-name': 'throttle0',
+                 'throttle-group': 'group0', 'file': 'hd0-file' }
+        result = self.vm.qmp('blockdev-add', conv_keys = False, **opts)
+        self.assert_qmp(result, 'return', {})
+
+        # Insert the throttle filter between hd0 and hd0-file
+        self.reopen(hd0_opts, {'file': 'throttle0'})
+
+        # Remove the throttle filter from hd0
+        self.reopen(hd0_opts, {'file': 'hd0-file'})
+
+    # Insert (and remove) a compress filter
+    def test_insert_compress_filter(self):
+        # Add an image to the VM: hd (raw) -> hd0 (qcow2) -> hd0-file (file)
+        opts = {'driver': 'raw', 'node-name': 'hd', 'file': hd_opts(0)}
+        result = self.vm.qmp('blockdev-add', conv_keys = False, **opts)
+        self.assert_qmp(result, 'return', {})
+
+        # Add a 'compress' filter
+        filter_opts = {'driver': 'compress',
+                       'node-name': 'compress0',
+                       'file': 'hd0'}
+        result = self.vm.qmp('blockdev-add', conv_keys = False, **filter_opts)
+        self.assert_qmp(result, 'return', {})
+
+        # Unmap the beginning of the image (we cannot write compressed
+        # data to an allocated cluster)
+        self.run_qemu_io("hd", "write -z -u 0 128k")
+
+        # Write data to the first cluster
+        self.run_qemu_io("hd", "write -P 0xa0 0 64k")
+
+        # Insert the filter then write to the second cluster
+        # hd -> compress0 -> hd0 -> hd0-file
+        self.reopen(opts, {'file': 'compress0'})
+        self.run_qemu_io("hd", "write -P 0xa1 64k 64k")
+
+        # Remove the filter then write to the third cluster
+        # hd -> hd0 -> hd0-file
+        self.reopen(opts, {'file': 'hd0'})
+        self.run_qemu_io("hd", "write -P 0xa2 128k 64k")
+
+        # Verify the data that we just wrote
+        self.run_qemu_io("hd", "read -P 0xa0    0 64k")
+        self.run_qemu_io("hd", "read -P 0xa1  64k 64k")
+        self.run_qemu_io("hd", "read -P 0xa2 128k 64k")
+
+        self.vm.shutdown()
+
+        # Check the first byte of the first three L2 entries and verify that
+        # the second one is compressed (0x40) while the others are not (0x80)
+        iotests.qemu_io_log('-f', 'raw', '-c', 'read -P 0x80 0x40000 1',
+                                         '-c', 'read -P 0x40 0x40008 1',
+                                         '-c', 'read -P 0x80 0x40010 1', hd_path[0])
+
     # Misc reopen tests with different block drivers
     @iotests.skip_if_unsupported(['quorum', 'throttle'])
     def test_misc_drivers(self):

tests/qemu-iotests/245.out

@@ -10,8 +10,15 @@
 {"return": {}}
 {"data": {"id": "stream0", "type": "stream"}, "event": "BLOCK_JOB_PENDING", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
 {"data": {"device": "stream0", "len": 3145728, "offset": 3145728, "speed": 0, "type": "stream"}, "event": "BLOCK_JOB_COMPLETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
-...............
+....read 1/1 bytes at offset 262144
+1 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 1/1 bytes at offset 262152
+1 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 1/1 bytes at offset 262160
+1 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+..............
 ----------------------------------------------------------------------
-Ran 21 tests
+Ran 24 tests
 
 OK