@@ -55,7 +55,7 @@ $QEMU_IO -c 'write -P 42 0 512' -c 'write -P 23 512 512' \
$QEMU_IMG convert -f raw -O $IMGFMT "$TEST_IMG.base" "$TEST_IMG"
-$QEMU_IO -c "open -o driver=$IMGFMT,file.driver=$IMGFMT,file.file.filename=$TEST_IMG" \
+$QEMU_IO -c "open -r -o driver=$IMGFMT,file.driver=$IMGFMT,file.file.filename=$TEST_IMG" \
-c 'read -P 42 0 512' -c 'read -P 23 512 512' \
-c 'read -P 66 1024 512' | _filter_qemu_io
@@ -63,6 +63,13 @@ $QEMU_IO -c "open -o driver=$IMGFMT,file.driver=$IMGFMT,file.file.filename=$TEST
# should not work for any image formats with a header.
$QEMU_IO -c 'read -P 42 0 512' "$TEST_IMG" | _filter_qemu_io
+# This should emit a warning: Writes to the inner image might require it to grow
+# which it cannot because the outer image has a fixed virtual size. Therefore,
+# opening it non-read-only may result in I/O errors and this is why there should
+# be a warning.
+$QEMU_IO -c "open -o driver=$IMGFMT,file.driver=$IMGFMT,file.file.filename=$TEST_IMG" \
+ 2>&1 | _filter_imgfmt
+
# success, all done
echo "*** done"
rm -f $seq.full
@@ -18,4 +18,5 @@ read 512/512 bytes at offset 1024
Pattern verification failed at offset 0, 512 bytes
read 512/512 bytes at offset 0
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Writes to the image '' in format 'IMGFMT' may require the file to grow which is not supported for this file; please open it read-only or try to export it in a different format over the protocol (e.g. use qemu-nbd instead of nbd-server)
*** done
@@ -66,7 +66,7 @@ $QEMU_IO -c 'write -P 42 0 512' -c 'write -P 23 512 512' \
$QEMU_IMG convert -f raw -O $IMGFMT "$TEST_IMG.base" "$TEST_IMG"
$QEMU_IO -c 'read -P 42 0 512' -c 'read -P 23 512 512' \
- -c 'read -P 66 1024 512' "json:{
+ -c 'read -P 66 1024 512' -r "json:{
\"driver\": \"$IMGFMT\",
\"file\": {
\"driver\": \"$IMGFMT\",
Test 072 (and 089 which copied some parts from it) tests image format nesting. When opening the inner image, qemu now correctly emits a warning because you should not attempt to write to the inner image of such a constellation. An example would be: 1. Create a qcow2 image with some relatively large virtual size. 2. Interpret this qcow2 image as a raw image and convert it to a qcow2 image. 3. This yields a qcow2 image whose virtual size is just enough to hold the original image's physical size; trying to grow the original (now inner) image would fail because the outer image cannot grow (without explicitly changing its size at least). Therefore, the warnings are correct; but the tests do not attempt to write to the inner image, they only read from it. Therefore, open it read-only to get rid of the messages. While at it, consciously add a check to test 072 that the warning is actually emitted if the inner image is not opened read-only. Signed-off-by: Max Reitz <mreitz@redhat.com> --- tests/qemu-iotests/072 | 9 ++++++++- tests/qemu-iotests/072.out | 1 + tests/qemu-iotests/089 | 2 +- 3 files changed, 10 insertions(+), 2 deletions(-)