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Diffstat (limited to 'tests/qemu-iotests/142')
| -rwxr-xr-x | tests/qemu-iotests/142 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/tests/qemu-iotests/142 b/tests/qemu-iotests/142 index 69fd10ef51..86d65a2d1a 100755 --- a/tests/qemu-iotests/142 +++ b/tests/qemu-iotests/142 @@ -350,6 +350,35 @@ info block backing-file" echo "$hmp_cmds" | run_qemu -drive "$files","$ids" | grep "Cache" +echo +echo "--- Alignment after changing O_DIRECT ---" +echo + +# Directly test the protocol level: Can unaligned requests succeed even if +# O_DIRECT was only enabled through a reopen and vice versa? + +# Ensure image size is a multiple of the sector size (required for O_DIRECT) +$QEMU_IMG create -f file "$TEST_IMG" 1M | _filter_img_create + +# And write some data (not strictly necessary, but it feels better to actually +# have something to be read) +$QEMU_IO -f file -c 'write 0 4096' "$TEST_IMG" | _filter_qemu_io + +$QEMU_IO --cache=writeback -f file $TEST_IMG <<EOF | _filter_qemu_io +read 42 42 +reopen -o cache.direct=on +read 42 42 +reopen -o cache.direct=off +read 42 42 +EOF +$QEMU_IO --cache=none -f file $TEST_IMG <<EOF | _filter_qemu_io +read 42 42 +reopen -o cache.direct=off +read 42 42 +reopen -o cache.direct=on +read 42 42 +EOF + # success, all done echo "*** done" rm -f $seq.full |