[Qemu-devel] [PATCH v3 2/2] vmdk: refuse enabling zeroed grain with flat images

[Fam Zheng <famz@redhat.com>]

This is a header flag and we needs sparse for the header.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/vmdk.c               | 4 ++++
 tests/qemu-iotests/059     | 4 ++++
 tests/qemu-iotests/059.out | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/block/vmdk.c b/block/vmdk.c
index 4f8ae77..90340eb 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1664,6 +1664,10 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
         error_setg(errp, "Flat image can't have backing file");
         return -ENOTSUP;
     }
+    if (flat && zeroed_grain) {
+        error_setg(errp, "Flat image can't enable zeroed grain");
+        return -ENOTSUP;
+    }
     if (backing_file) {
         BlockDriverState *bs = bdrv_new("");
         ret = bdrv_open(bs, backing_file, NULL, 0, NULL, errp);
diff --git a/tests/qemu-iotests/059 b/tests/qemu-iotests/059
index dd6addf..26d4538 100755
--- a/tests/qemu-iotests/059
+++ b/tests/qemu-iotests/059
@@ -71,6 +71,10 @@ echo
 IMGOPTS="subformat=monolithicFlat" _make_test_img 2G
 $QEMU_IMG info $TEST_IMG | _filter_testdir
 
+echo
+echo "=== Testing monolithicFlat with zeroed_grain ==="
+IMGOPTS="subformat=monolithicFlat,zeroed_grain=on" _make_test_img 2G
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/059.out b/tests/qemu-iotests/059.out
index dc4f024..2b29ca9 100644
--- a/tests/qemu-iotests/059.out
+++ b/tests/qemu-iotests/059.out
@@ -22,4 +22,8 @@ image: TEST_DIR/t.vmdk
 file format: vmdk
 virtual size: 2.0G (2147483648 bytes)
 disk size: 4.0K
+
+=== Testing monolithicFlat with zeroed_grain ===
+qemu-img: TEST_DIR/t.IMGFMT: Flat image can't enable zeroed grain
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2147483648
 *** done
-- 
1.8.3.1