[PATCH] iotests/MRCE: Write data to source

[Hanna Reitz <hreitz@redhat.com>]

This test assumes that mirror flushes the source when entering the READY
state, and that the format level will pass that flush on to the protocol
level (where we intercept it with blkdebug).

However, apparently that does not happen when using a VMDK image with
zeroed_grain=on, which actually is the default set by testenv.py.  Right
now, Python tests ignore IMGOPTS, though, so this has no effect; but
Vladimir has a series that will change this, so we need to fix this test
before that series lands.

We can fix it by writing data to the source before we start the mirror
job; apparently that makes the (VMDK) format layer change its mind and
pass on the pre-READY flush to the protocol level, so the test passes
again.  (I presume, without any data written, mirror just does a 64M
zero write on the target, which VMDK with zeroed_grain=on basically just
ignores.)

Without this, we do not get a flush, and so blkdebug only sees a single
flush at the end of the job instead of two, and therefore does not
inject an error, which makes the block job complete instead of raising
an error.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
---
As hinted at above, I think this should be merged before Vladimir's
"iotests: support zstd" series, or said test fails for me with VMDK.
(At least on one system, not the other...  Would be too easy otherwise,
obviously.)
---
 tests/qemu-iotests/tests/mirror-ready-cancel-error | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/tests/mirror-ready-cancel-error b/tests/qemu-iotests/tests/mirror-ready-cancel-error
index f2dc88881f..770ffca379 100755
--- a/tests/qemu-iotests/tests/mirror-ready-cancel-error
+++ b/tests/qemu-iotests/tests/mirror-ready-cancel-error
@@ -36,6 +36,11 @@ class TestMirrorReadyCancelError(iotests.QMPTestCase):
         assert iotests.qemu_img_create('-f', iotests.imgfmt, target,
                                        str(image_size)) == 0
 
+        # Ensure that mirror will copy something before READY so the
+        # target format layer will forward the pre-READY flush to its
+        # file child
+        assert iotests.qemu_io_silent('-c', 'write -P 1 0 64k', source) == 0
+
         self.vm = iotests.VM()
         self.vm.launch()
 
@@ -97,7 +102,7 @@ class TestMirrorReadyCancelError(iotests.QMPTestCase):
         # Write something so will not leave the job immediately, but
         # flush first (which will fail, thanks to blkdebug)
         res = self.vm.qmp('human-monitor-command',
-                          command_line='qemu-io mirror-top "write 0 64k"')
+                          command_line='qemu-io mirror-top "write -P 2 0 64k"')
         self.assert_qmp(res, 'return', '')
 
         # Drain status change events
-- 
2.33.1