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tests/qemu-iotests/197: add testcase for CoR with subclusters

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Add testcase which checks that allocations during copy-on-read are
performed on the subcluster basis when subclusters are enabled in target
image.

This testcase also triggers the following assert with previous commit
not being applied, so we check that as well:

qemu-io: ../block/io.c:1236: bdrv_co_do_copy_on_readv: Assertion `skip_bytes < pnum' failed.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230711172553.234055-4-andrey.drobyshev@virtuozzo.com>
This commit is contained in:
Andrey Drobyshev 2023-07-11 20:25:53 +03:00 committed by Stefan Hajnoczi
parent fc6b211f92
commit e2f938265e
2 changed files with 53 additions and 0 deletions
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29
tests/qemu-iotests/197
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@ -122,6 +122,35 @@ $QEMU_IO -f qcow2 -C -c 'read 0 1024' "$TEST_WRAP" | _filter_qemu_io
$QEMU_IO -f qcow2 -c map "$TEST_WRAP"
_check_test_img
echo
echo '=== Copy-on-read with subclusters ==='
echo
# Create base and top images 64K (1 cluster) each. Make subclusters enabled
# for the top image
_make_test_img 64K
IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
_make_test_img --no-opts -o extended_l2=true -F "$IMGFMT" -b "$TEST_IMG" \
64K | _filter_img_create
$QEMU_IO -c "write -P 0xaa 0 64k" "$TEST_IMG" | _filter_qemu_io
# Allocate individual subclusters in the top image, and not the whole cluster
$QEMU_IO -c "write -P 0xbb 28K 2K" -c "write -P 0xcc 34K 2K" "$TEST_WRAP" \
| _filter_qemu_io
# Only 2 subclusters should be allocated in the top image at this point
$QEMU_IMG map "$TEST_WRAP" | _filter_qemu_img_map
# Actual copy-on-read operation
$QEMU_IO -C -c "read -P 0xaa 30K 4K" "$TEST_WRAP" | _filter_qemu_io
# And here we should have 4 subclusters allocated right in the middle of the
# top image. Make sure the whole cluster remains unallocated
$QEMU_IMG map "$TEST_WRAP" | _filter_qemu_img_map
_check_test_img
# success, all done
echo '*** done'
status=0

24
tests/qemu-iotests/197.out
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@ -31,4 +31,28 @@ read 1024/1024 bytes at offset 0
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
1 KiB (0x400) bytes allocated at offset 0 bytes (0x0)
No errors were found on the image.
=== Copy-on-read with subclusters ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=65536
Formatting 'TEST_DIR/t.wrap.IMGFMT', fmt=IMGFMT size=65536 backing_file=TEST_DIR/t.IMGFMT backing_fmt=IMGFMT
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 2048/2048 bytes at offset 28672
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 2048/2048 bytes at offset 34816
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0 0x7000 TEST_DIR/t.IMGFMT
0x7000 0x800 TEST_DIR/t.wrap.IMGFMT
0x7800 0x1000 TEST_DIR/t.IMGFMT
0x8800 0x800 TEST_DIR/t.wrap.IMGFMT
0x9000 0x7000 TEST_DIR/t.IMGFMT
read 4096/4096 bytes at offset 30720
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0 0x7000 TEST_DIR/t.IMGFMT
0x7000 0x2000 TEST_DIR/t.wrap.IMGFMT
0x9000 0x7000 TEST_DIR/t.IMGFMT
No errors were found on the image.
*** done