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Re: [PATCH v12 01/11] iotests: add test for QCOW2 header dump

From: Eric Blake
Subject: Re: [PATCH v12 01/11] iotests: add test for QCOW2 header dump
Date: Thu, 30 Jul 2020 14:05:48 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 7/30/20 9:15 AM, Andrey Shinkevich wrote:
The simple script creates a QCOW2 image and fills it with some data.
Two bitmaps are created as well. Then the script reads the image header
with extensions from the disk by running the script qcow2.py and dumps
the information to the output. Other entities, such as snapshots, may
be added to the test later.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
  tests/qemu-iotests/303     | 59 ++++++++++++++++++++++++++++++++++++++++++
  tests/qemu-iotests/303.out | 64 ++++++++++++++++++++++++++++++++++++++++++++++
  tests/qemu-iotests/group   |  1 +
  3 files changed, 124 insertions(+)
  create mode 100755 tests/qemu-iotests/303
  create mode 100644 tests/qemu-iotests/303.out

+import iotests
+import subprocess
+from iotests import qemu_img_create, qemu_io, file_path, log, filter_qemu_io
+disk = file_path('disk')
+chunk = 1024 * 1024
+def create_bitmap(bitmap_number, disabled):
+    granularity = 1 << (14 + bitmap_number)
+    bitmap_name = 'bitmap-' + str(bitmap_number)
+    vm = iotests.VM().add_drive(disk)
+    vm.launch()
+    vm.qmp_log('block-dirty-bitmap-add', node='drive0', name=bitmap_name,
+               granularity=granularity, persistent=True, disabled=disabled)
+    vm.shutdown()

Would it be any easier to use qemu-img bitmap here instead of firing up a full VM?

At any rate, this is a nice starting point for tracking what the rest of your series improves.

Reviewed-by: Eric Blake <eblake@redhat.com>

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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