iotests/image-fleecing: test push backup with fleecing

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20220303194349.2304213-17-vsementsov@virtuozzo.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>

tests/qemu-iotests/tests/image-fleecing

@@ -51,9 +51,15 @@ remainder = [('0xd5', '0x108000',  '32k'), # Right-end of partial-left [1]
              ('0xdc', '32M',       '32k'), # Left-end of partial-right [2]
              ('0xcd', '0x3ff0000', '64k')] # patterns[3]
 
-def do_test(use_cbw, use_snapshot_access_filter, base_img_path,
+def do_test(vm, use_cbw, use_snapshot_access_filter, base_img_path,
-            fleece_img_path, nbd_sock_path, vm,
+            fleece_img_path, nbd_sock_path=None,
+            target_img_path=None,
             bitmap=False):
+    push_backup = target_img_path is not None
+    assert (nbd_sock_path is not None) != push_backup
+    if push_backup:
+        assert use_cbw
+
     log('--- Setting up images ---')
     log('')
 
@@ -67,6 +73,9 @@ def do_test(use_cbw, use_snapshot_access_filter, base_img_path,
     else:
         assert qemu_img('create', '-f', 'qcow2', fleece_img_path, '64M') == 0
 
+    if push_backup:
+        assert qemu_img('create', '-f', 'qcow2', target_img_path, '64M') == 0
+
     for p in patterns:
         qemu_io('-f', iotests.imgfmt,
                 '-c', 'write -P%s %s %s' % p, base_img_path)
@@ -141,6 +150,23 @@ def do_test(use_cbw, use_snapshot_access_filter, base_img_path,
 
     export_node = 'fl-access' if use_snapshot_access_filter else tmp_node
 
+    if push_backup:
+        log('')
+        log('--- Starting actual backup ---')
+        log('')
+
+        log(vm.qmp('blockdev-add', **{
+            'driver': iotests.imgfmt,
+            'node-name': 'target',
+            'file': {
+                'driver': 'file',
+                'filename': target_img_path
+            }
+        }))
+        log(vm.qmp('blockdev-backup', device=export_node,
+                   sync='full', target='target',
+                   job_id='push-backup', speed=1))
+    else:
         log('')
         log('--- Setting up NBD Export ---')
         log('')
@@ -173,6 +199,23 @@ def do_test(use_cbw, use_snapshot_access_filter, base_img_path,
         log(cmd)
         log(vm.hmp_qemu_io(qom_path, cmd, qdev=True))
 
+    if push_backup:
+        # Check that previous operations were done during backup, not after
+        # If backup is already finished, it's possible that it was finished
+        # even before hmp qemu_io write, and we didn't actually test
+        # copy-before-write operation. This should not happen, as we use
+        # speed=1. But worth checking.
+        result = vm.qmp('query-block-jobs')
+        assert len(result['return']) == 1
+
+        result = vm.qmp('block-job-set-speed', device='push-backup', speed=0)
+        assert result == {'return': {}}
+
+        log(vm.event_wait(name='BLOCK_JOB_COMPLETED',
+                          match={'data': {'device': 'push-backup'}}),
+            filters=[iotests.filter_qmp_event])
+        log(vm.qmp('blockdev-del', node_name='target'))
+
     log('')
     log('--- Verifying Data ---')
     log('')
@@ -180,8 +223,12 @@ def do_test(use_cbw, use_snapshot_access_filter, base_img_path,
     for p in patterns + zeroes:
         cmd = 'read -P%s %s %s' % p
         log(cmd)
-        out, ret = qemu_io_pipe_and_status('-r', '-f', 'raw', '-c', cmd,
+        args = ['-r', '-c', cmd]
-                                           nbd_uri)
+        if push_backup:
+            args += [target_img_path]
+        else:
+            args += ['-f', 'raw', nbd_uri]
+        out, ret = qemu_io_pipe_and_status(*args)
         if ret != 0:
             print(out)
 
@@ -189,6 +236,7 @@ def do_test(use_cbw, use_snapshot_access_filter, base_img_path,
     log('--- Cleanup ---')
     log('')
 
+    if not push_backup:
         log(vm.qmp('nbd-server-stop'))
 
     if use_cbw:
@@ -218,24 +266,37 @@ def do_test(use_cbw, use_snapshot_access_filter, base_img_path,
     log('Done')
 
 
-def test(use_cbw, use_snapshot_access_filter, bitmap=False):
+def test(use_cbw, use_snapshot_access_filter,
+         nbd_sock_path=None, target_img_path=None, bitmap=False):
     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, use_snapshot_access_filter, base_img_path,
+        do_test(vm, use_cbw, use_snapshot_access_filter, base_img_path,
-                fleece_img_path, nbd_sock_path, vm, bitmap=bitmap)
+                fleece_img_path, nbd_sock_path, target_img_path,
+                bitmap=bitmap)
+
+def test_pull(use_cbw, use_snapshot_access_filter, bitmap=False):
+    with iotests.FilePath('nbd.sock',
+                          base_dir=iotests.sock_dir) as nbd_sock_path:
+        test(use_cbw, use_snapshot_access_filter, nbd_sock_path, None,
+             bitmap=bitmap)
+
+def test_push():
+    with iotests.FilePath('target.img') as target_img_path:
+        test(True, True, None, target_img_path)
 
 
 log('=== Test backup(sync=none) based fleecing ===\n')
-test(False, False)
+test_pull(False, False)
 
 log('=== Test cbw-filter based fleecing ===\n')
-test(True, False)
+test_pull(True, False)
 
 log('=== Test fleecing-format based fleecing ===\n')
-test(True, True)
+test_pull(True, True)
 
 log('=== Test fleecing-format based fleecing with bitmap ===\n')
-test(True, True, bitmap=True)
+test_pull(True, True, bitmap=True)
+
+log('=== Test push backup with fleecing ===\n')
+test_push()

tests/qemu-iotests/tests/image-fleecing.out

@@ -293,3 +293,66 @@ read -P0xdc 32M 32k
 read -P0xcd 0x3ff0000 64k
 
 Done
+=== Test push backup with fleecing ===
+
+--- Setting up images ---
+
+Done
+
+--- Launching VM ---
+
+Done
+
+--- Setting up Fleecing Graph ---
+
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+
+--- Starting actual backup ---
+
+{"return": {}}
+{"return": {}}
+
+--- Testing COW ---
+
+write -P0xab 0 64k
+{"return": ""}
+write -P0xad 0x00f8000 64k
+{"return": ""}
+write -P0x1d 0x2008000 64k
+{"return": ""}
+write -P0xea 0x3fe0000 64k
+{"return": ""}
+{"data": {"device": "push-backup", "len": 67108864, "offset": 67108864, "speed": 0, "type": "backup"}, "event": "BLOCK_JOB_COMPLETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
+{"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