[PATCH 7/7] qemuBlockStorageSourceCreateDetectSize: Propagate 'extended_l2' feature to new overlays

[Peter Krempa <pkrempa@xxxxxxxxxx>]

In cases where the qcow2 image is using subclusters/extended_l2 entries
we should propagate them to the new images which are based on such
images.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 src/qemu/qemu_block.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index bff93e96ee..2e606e99b4 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -2941,11 +2941,18 @@ qemuBlockStorageSourceCreateDetectSize(GHashTable *blockNamedNodeData,
         return -1;
     }

-    /* propagate cluster size if the images are compatible */
+    /* propagate properties of qcow2 images if possible*/
     if (templ->format == VIR_STORAGE_FILE_QCOW2 &&
-        src->format == VIR_STORAGE_FILE_QCOW2 &&
-        src->clusterSize == 0)
-        src->clusterSize = entry->clusterSize;
+        src->format == VIR_STORAGE_FILE_QCOW2) {
+        if (src->clusterSize == 0)
+            src->clusterSize = entry->clusterSize;
+
+        if (entry->qcow2extendedL2) {
+            if (!src->features)
+                src->features = virBitmapNew(VIR_STORAGE_FILE_FEATURE_LAST);
+            ignore_value(virBitmapSetBit(src->features, VIR_STORAGE_FILE_FEATURE_EXTENDED_L2));
+        }
+    }

     if (src->format == VIR_STORAGE_FILE_RAW) {
         src->physical = entry->capacity;
-- 
2.31.1