@@ -133,6 +133,7 @@ class BackupTest(iotests.QMPTestCase):
self.vm = iotests.VM()
self.test_img = img_create('test')
self.dest_img = img_create('dest')
+ self.ref_img = img_create('ref')
self.vm.add_drive(self.test_img)
self.vm.launch()
@@ -140,6 +141,7 @@ class BackupTest(iotests.QMPTestCase):
self.vm.shutdown()
try_remove(self.test_img)
try_remove(self.dest_img)
+ try_remove(self.ref_img)
def hmp_io_writes(self, drive, patterns):
for pattern in patterns:
@@ -177,6 +179,43 @@ class BackupTest(iotests.QMPTestCase):
self.assert_qmp(event, 'data/error', qerror)
return False
+ def test_overlapping_writes(self):
+ # Write something to back up
+ self.hmp_io_writes('drive0', [('42', '0M', '2M')])
+
+ # Create a reference backup
+ self.qmp_backup_and_wait(device='drive0', format=iotests.imgfmt,
+ sync='full', target=self.ref_img,
+ auto_dismiss=False)
+ res = self.vm.qmp('block-job-dismiss', id='drive0')
+ self.assert_qmp(res, 'return', {})
+
+ # Now to the test backup: We simulate the following guest
+ # writes:
+ # (1) [1M + 64k, 1M + 128k): Afterwards, everything in that
+ # area should be in the target image, and we must not copy
+ # it again (because the source image has changed now)
+ # (64k is the job's cluster size)
+ # (2) [1M, 2M): The backup job must not get overeager. It
+ # must copy [1M, 1M + 64k) and [1M + 128k, 2M) separately,
+ # but not the area in between.
+
+ self.qmp_backup(device='drive0', format=iotests.imgfmt, sync='full',
+ target=self.dest_img, speed=1, auto_dismiss=False)
+
+ self.hmp_io_writes('drive0', [('23', '%ik' % (1024 + 64), '64k'),
+ ('66', '1M', '1M')])
+
+ # Let the job complete
+ res = self.vm.qmp('block-job-set-speed', device='drive0', speed=0)
+ self.assert_qmp(res, 'return', {})
+ self.qmp_backup_wait('drive0')
+ res = self.vm.qmp('block-job-dismiss', id='drive0')
+ self.assert_qmp(res, 'return', {})
+
+ self.assertTrue(iotests.compare_images(self.ref_img, self.dest_img),
+ 'target image does not match reference image')
+
def test_dismiss_false(self):
res = self.vm.qmp('query-block-jobs')
self.assert_qmp(res, 'return', [])
@@ -1,5 +1,5 @@
-.........
+..........
----------------------------------------------------------------------
-Ran 9 tests
+Ran 10 tests
OK
Perform two guest writes to not yet backed up areas of an image, where the former touches an inner area of the latter. Before HEAD^, copy offloading broke this in two ways: (1) The target image differs from the reference image (what the source was when the backup started). (2) But you will not see that in the failing output, because the job offset is reported as being greater than the job length. This is because one cluster is copied twice, and thus accounted for twice, but of course the job length does not increase. Signed-off-by: Max Reitz <mreitz@redhat.com> --- tests/qemu-iotests/056 | 39 ++++++++++++++++++++++++++++++++++++++ tests/qemu-iotests/056.out | 4 ++-- 2 files changed, 41 insertions(+), 2 deletions(-)