[PATCH 21/21] itotests/222: add test-case for copy-before-write filter

[Vladimir Sementsov-Ogievskiy]

New fleecing method becomes available: copy-before-write filter.

Actually we don't need backup job to setup image fleecing. Add test
fore new recommended way of image fleecing.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 tests/qemu-iotests/222     | 56 ++++++++++++++++++++++-------
 tests/qemu-iotests/222.out | 72 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 115 insertions(+), 13 deletions(-)

diff --git a/tests/qemu-iotests/222 b/tests/qemu-iotests/222
index b48afe623e..8f8e1e4d7f 100755
--- a/tests/qemu-iotests/222
+++ b/tests/qemu-iotests/222
@@ -48,11 +48,13 @@ remainder = [("0xd5", "0x108000",  "32k"), # Right-end of 
partial-left [1]
              ("0xdc", "32M",       "32k"), # Left-end of partial-right [2]
              ("0xcd", "0x3ff0000", "64k")] # patterns[3]
 
-with iotests.FilePath('base.img') as base_img_path, \
-     iotests.FilePath('fleece.img') as fleece_img_path, \
-     iotests.FilePath('nbd.sock', base_dir=iotests.sock_dir) as nbd_sock_path, 
\
-     iotests.VM() as vm:
+def do_test(use_cbw, base_img_path, fleece_img_path, nbd_sock_path, vm):
+    if use_cbw:
+        log('=== Test filter based fleecing ===')
+    else:
+        log('=== Test backup(sync=none) based fleecing ===')
 
+    log('')
     log('--- Setting up images ---')
     log('')
 
@@ -69,7 +71,7 @@ with iotests.FilePath('base.img') as base_img_path, \
     log('--- Launching VM ---')
     log('')
 
-    vm.add_drive(base_img_path)
+    vm.add_drive(base_img_path, "node-name=node0")
     vm.launch()
     log('Done')
 
@@ -91,11 +93,22 @@ with iotests.FilePath('base.img') as base_img_path, \
         "backing": src_node,
     }))
 
-    # Establish COW from source to fleecing node
-    log(vm.qmp("blockdev-backup",
-               device=src_node,
-               target=tgt_node,
-               sync="none"))
+    # Establish CBW from source to fleecing node
+    if use_cbw:
+        log(vm.qmp("blockdev-add", **{
+            "driver": "copy-before-write",
+            "node-name": "fl-cbw",
+            "file": src_node,
+            "target": tgt_node
+        }))
+
+        log(vm.qmp("qom-set", path="/machine/peripheral-anon/device[0]",
+                   property="drive", value="fl-cbw"))
+    else:
+        log(vm.qmp("blockdev-backup",
+                   device=src_node,
+                   target=tgt_node,
+                   sync="none"))
 
     log('')
     log('--- Setting up NBD Export ---')
@@ -139,9 +152,15 @@ with iotests.FilePath('base.img') as base_img_path, \
     log('--- Cleanup ---')
     log('')
 
-    log(vm.qmp('block-job-cancel', device=src_node))
-    log(vm.event_wait('BLOCK_JOB_CANCELLED'),
-        filters=[iotests.filter_qmp_event])
+    if use_cbw:
+        log(vm.qmp("qom-set", path="/machine/peripheral-anon/device[0]",
+                   property="drive", value="node0"))
+        log(vm.qmp("blockdev-del", node_name="fl-cbw"))
+    else:
+        log(vm.qmp('block-job-cancel', device=src_node))
+        log(vm.event_wait('BLOCK_JOB_CANCELLED'),
+            filters=[iotests.filter_qmp_event])
+
     log(vm.qmp('nbd-server-stop'))
     log(vm.qmp('blockdev-del', node_name=tgt_node))
     vm.shutdown()
@@ -157,3 +176,14 @@ with iotests.FilePath('base.img') as base_img_path, \
 
     log('')
     log('Done')
+
+def test(use_cbw):
+    with iotests.FilePath('base.img') as base_img_path, \
+         iotests.FilePath('fleece.img') as fleece_img_path, \
+         iotests.FilePath('nbd.sock',
+                          base_dir=iotests.sock_dir) as nbd_sock_path, \
+         iotests.VM() as vm:
+        do_test(use_cbw, base_img_path, fleece_img_path, nbd_sock_path, vm)
+
+test(False)
+test(True)
diff --git a/tests/qemu-iotests/222.out b/tests/qemu-iotests/222.out
index 16643dde30..bdc0f7912f 100644
--- a/tests/qemu-iotests/222.out
+++ b/tests/qemu-iotests/222.out
@@ -1,3 +1,5 @@
+=== Test backup(sync=none) based fleecing ===
+
 --- Setting up images ---
 
 Done
@@ -65,3 +67,73 @@ read -P0xdc 32M 32k
 read -P0xcd 0x3ff0000 64k
 
 Done
+=== Test filter based fleecing ===
+
+--- Setting up images ---
+
+Done
+
+--- Launching VM ---
+
+Done
+
+--- Setting up Fleecing Graph ---
+
+{"return": {}}
+{"return": {}}
+{"return": {}}
+
+--- Setting up NBD Export ---
+
+{"return": {}}
+{"return": {}}
+
+--- Sanity Check ---
+
+read -P0x5d 0 64k
+read -P0xd5 1M 64k
+read -P0xdc 32M 64k
+read -P0xcd 0x3ff0000 64k
+read -P0 0x00f8000 32k
+read -P0 0x2010000 32k
+read -P0 0x3fe0000 64k
+
+--- Testing COW ---
+
+write -P0xab 0 64k
+{"return": ""}
+write -P0xad 0x00f8000 64k
+{"return": ""}
+write -P0x1d 0x2008000 64k
+{"return": ""}
+write -P0xea 0x3fe0000 64k
+{"return": ""}
+
+--- Verifying Data ---
+
+read -P0x5d 0 64k
+read -P0xd5 1M 64k
+read -P0xdc 32M 64k
+read -P0xcd 0x3ff0000 64k
+read -P0 0x00f8000 32k
+read -P0 0x2010000 32k
+read -P0 0x3fe0000 64k
+
+--- Cleanup ---
+
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+
+--- Confirming writes ---
+
+read -P0xab 0 64k
+read -P0xad 0x00f8000 64k
+read -P0x1d 0x2008000 64k
+read -P0xea 0x3fe0000 64k
+read -P0xd5 0x108000 32k
+read -P0xdc 32M 32k
+read -P0xcd 0x3ff0000 64k
+
+Done
-- 
2.29.2