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+#!/usr/bin/env python3
+# group: rw quick
+#
+# Test what happens when a stream job does an unaligned prefetch read
+# which requires padding while having a NULL qiov.
+#
+# Copyright (C) Proxmox Server Solutions GmbH
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+import os
+import iotests
+from iotests import imgfmt, qemu_img_create, qemu_io, QMPTestCase
+
+image_size = 1 * 1024 * 1024
+cluster_size = 64 * 1024
+base = os.path.join(iotests.test_dir, 'base.img')
+top = os.path.join(iotests.test_dir, 'top.img')
+
+class TestStreamUnalignedPrefetch(QMPTestCase):
+ def setUp(self) -> None:
+ """
+ Create two images:
+ - base image {base} with {cluster_size // 2} bytes allocated
+ - top image {top} without any data allocated and coarser
+ cluster size
+
+ Attach a compress filter for the top image, because that
+ requires that the request alignment is the top image's cluster
+ size.
+ """
+ qemu_img_create('-f', imgfmt,
+ '-o', 'cluster_size={}'.format(cluster_size // 2),
+ base, str(image_size))
+ qemu_io('-c', f'write 0 {cluster_size // 2}', base)
+ qemu_img_create('-f', imgfmt,
+ '-o', 'cluster_size={}'.format(cluster_size),
+ top, str(image_size))
+
+ self.vm = iotests.VM()
+ self.vm.add_blockdev(self.vm.qmp_to_opts({
+ 'driver': imgfmt,
+ 'node-name': 'base',
+ 'file': {
+ 'driver': 'file',
+ 'filename': base
+ }
+ }))
+ self.vm.add_blockdev(self.vm.qmp_to_opts({
+ 'driver': 'compress',
+ 'node-name': 'compress-top',
+ 'file': {
+ 'driver': imgfmt,
+ 'node-name': 'top',
+ 'file': {
+ 'driver': 'file',
+ 'filename': top
+ },
+ 'backing': 'base'
+ }
+ }))
+ self.vm.launch()
+
+ def tearDown(self) -> None:
+ self.vm.shutdown()
+ os.remove(top)
+ os.remove(base)
+
+ def test_stream_unaligned_prefetch(self) -> None:
+ self.vm.cmd('block-stream', job_id='stream', device='compress-top')
+
+
+if __name__ == '__main__':
+ iotests.main(supported_fmts=['qcow2'], supported_protocols=['file'])
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+.
+----------------------------------------------------------------------
+Ran 1 tests
+
+OK