jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
iotest 033: add misaligned write-zeroes test via truncate
This new test case only makes sense for qcow2 while iotest 033 is generic;
however it matches the test purpose perfectly and also 033 contains those
do_test() tricks to pass the alignment, which won't look nice being
duplicated in other tests or moved to the common code.
Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
authored by
Anton Nefedov
and committed by
Kevin Wolf
afe35cde
18a59f03
+42
+29
tests/qemu-iotests/033
+29
tests/qemu-iotests/033
···
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} | $QEMU_IO $IO_EXTRA_ARGS
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}
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echo
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echo "=== Test aligned and misaligned write zeroes operations ==="
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for write_zero_cmd in "write -z" "aio_write -z"; do
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for align in 512 4k; do
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echo
···
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done
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done
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# Trigger truncate that would shrink qcow2 L1 table, which is done by
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# clearing one entry (8 bytes) with bdrv_co_pwrite_zeroes()
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echo
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echo "=== Test misaligned write zeroes via truncate ==="
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echo
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# any size will do, but the smaller the size the smaller the required image
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CLUSTER_SIZE=$((4 * 1024))
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L2_COVERAGE=$(($CLUSTER_SIZE * $CLUSTER_SIZE / 8))
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_make_test_img $(($L2_COVERAGE * 2))
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do_test 512 "write -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
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# next L2 table
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do_test 512 "write -P 1 $L2_COVERAGE 0x200" "$TEST_IMG" | _filter_qemu_io
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# only interested in qcow2 here; also other formats might respond with
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# "not supported" error message
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if [ $IMGFMT = "qcow2" ]; then
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do_test 512 "truncate $L2_COVERAGE" "$TEST_IMG" | _filter_qemu_io
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fi
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do_test 512 "read -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
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# success, all done
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echo
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echo "*** done"
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rm -f $seq.full
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status=0
+13
tests/qemu-iotests/033.out
+13
tests/qemu-iotests/033.out
···
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QA output created by 033
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
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=== Test aligned and misaligned write zeroes operations ===
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== preparing image ==
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wrote 1024/1024 bytes at offset 512
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
···
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 3072/3072 bytes at offset 1024
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3 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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=== Test misaligned write zeroes via truncate ===
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4194304
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wrote 512/512 bytes at offset 0
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 512/512 bytes at offset 2097152
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 512/512 bytes at offset 0
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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*** done