qcow2: Add iotest for an empty refcount table
This patch adds a simple iotest in which we try to write to an image
with an empty refcount table (i.e. with all entries set to 0).
This scenario was already handled by the existing consistency checks,
but we add an explicit test case for completeness.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 7e48b0e2ae1a0a18e0ee303b3045f130feec0474.1509718618.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/tests/qemu-iotests/060 b/tests/qemu-iotests/060
index dc5a517..66a8fa4 100755
--- a/tests/qemu-iotests/060
+++ b/tests/qemu-iotests/060
@@ -243,6 +243,13 @@
$QEMU_IO -c "discard 0 64k" -c "read 64k 64k" "$TEST_IMG" | _filter_qemu_io
echo
+echo "=== Testing empty refcount table ==="
+echo
+_make_test_img 64M
+poke_file "$TEST_IMG" "$rt_offset" "\x00\x00\x00\x00\x00\x00\x00\x00"
+$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io
+
+echo
echo "=== Testing empty refcount table with valid L1 and L2 tables ==="
echo
_make_test_img 64M
diff --git a/tests/qemu-iotests/060.out b/tests/qemu-iotests/060.out
index 98f314c..cfd78f8 100644
--- a/tests/qemu-iotests/060.out
+++ b/tests/qemu-iotests/060.out
@@ -182,6 +182,12 @@
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read failed: Input/output error
+=== Testing empty refcount table ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+qcow2: Marking image as corrupt: Preventing invalid write on metadata (overlaps with refcount table); further corruption events will be suppressed
+write failed: Input/output error
+
=== Testing empty refcount table with valid L1 and L2 tables ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
