Commit 90b5f6ca17 for qemu.org

commit 90b5f6ca171dcc7673c95e31f2a270b64608bb70
Author: Fiona Ebner <f.ebner@proxmox.com>
Date:   Wed Sep 30 15:19:22 2026 +0200

    iotests: add test cases for failing flush after qemu-img convert

    In preparation to add more checks in the following commits and show
    how the behavior changes.

    Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
    Message-ID: <20260930132140.2342574-2-f.ebner@proxmox.com>
    Reviewed-by: Eric Blake <eblake@redhat.com>
    Signed-off-by: Eric Blake <eblake@redhat.com>

diff --git a/tests/qemu-iotests/122 b/tests/qemu-iotests/122
index 7f84188f51..6eafbec0e2 100755
--- a/tests/qemu-iotests/122
+++ b/tests/qemu-iotests/122
@@ -332,6 +332,39 @@ echo
 $QEMU_IMG convert -O $IMGFMT -o preallocation=metadata -n \
 	  "$TEST_IMG" "$TEST_IMG".orig && echo "unexpected success"

+echo
+echo "=== failing flush after convert with default ('unsafe') cache mode ==="
+echo
+
+TEST_IMG="$TEST_IMG".orig _make_test_img 1M
+TEST_IMG="$TEST_IMG" _make_test_img 1M
+
+$QEMU_IO -c "write -P 42 0 1M" "$TEST_IMG".orig | _filter_qemu_io
+
+target_fails_flush="json:{
+    'driver': '$IMGFMT',
+    'file': {
+        'driver': 'blkdebug',
+        'inject-error': [{
+            'event': 'flush_to_disk'
+        }],
+        'image': {
+            'driver': 'file',
+            'filename': '$TEST_IMG'
+        }
+    }
+}"
+
+$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG".orig "$target_fails_flush"
+echo "qemu-img convert exited with status $?"
+
+echo
+echo "=== failing flush after convert with 'writeback' cache mode ==="
+echo
+
+$QEMU_IMG convert -t writeback -f $IMGFMT -O $IMGFMT -n "$TEST_IMG".orig "$target_fails_flush"
+echo "qemu-img convert exited with status $?"
+
 # success, all done
 echo '*** done'
 rm -f $seq.full
diff --git a/tests/qemu-iotests/122.out b/tests/qemu-iotests/122.out
index 6a1aa3fe2b..f3e28f33bc 100644
--- a/tests/qemu-iotests/122.out
+++ b/tests/qemu-iotests/122.out
@@ -256,4 +256,18 @@ Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=67108864
 === -n incompatible with -o ===

 qemu-img: -o has no effect when skipping image creation
+
+=== failing flush after convert with default ('unsafe') cache mode ===
+
+Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=1048576
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-img convert exited with status 0
+
+=== failing flush after convert with 'writeback' cache mode ===
+
+qemu-img: Failed to flush the L2 table cache: Input/output error
+qemu-img: Failed to flush the refcount block cache: Input/output error
+qemu-img convert exited with status 0
 *** done