qemu: monitor: Add helper for generating data for block bitmap merging

Introduce qemuMonitorTransactionBitmapMergeSourceAddBitmap which adds
the appropriate entry into a virJSONValue array to be used with
qemuMonitorTransactionBitmapMerge. Bitmap merging supports two possible
formats and this new helper implements the more universal one specifying
also the source node name.

In addition use the new helper in the testQemuMonitorJSONTransaction
test.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_monitor.c

@@ -4598,6 +4598,15 @@ qemuMonitorTransactionBitmapMerge(virJSONValuePtr actions,
 }
 
 
+int
+qemuMonitorTransactionBitmapMergeSourceAddBitmap(virJSONValuePtr sources,
+                                                 const char *sourcenode,
+                                                 const char *sourcebitmap)
+{
+    return qemuMonitorJSONTransactionBitmapMergeSourceAddBitmap(sources, sourcenode, sourcebitmap);
+}
+
+
 int
 qemuMonitorTransactionSnapshotLegacy(virJSONValuePtr actions,
                                      const char *device,

src/qemu/qemu_monitor.h

@@ -1383,6 +1383,10 @@ qemuMonitorTransactionBitmapMerge(virJSONValuePtr actions,
                                   const char *node,
                                   const char *target,
                                   virJSONValuePtr *sources);
+int
+qemuMonitorTransactionBitmapMergeSourceAddBitmap(virJSONValuePtr sources,
+                                                 const char *sourcenode,
+                                                 const char *sourcebitmap);
 
 int
 qemuMonitorTransactionSnapshotLegacy(virJSONValuePtr actions,

src/qemu/qemu_monitor_json.c

@@ -9281,6 +9281,27 @@ qemuMonitorJSONTransactionBitmapMerge(virJSONValuePtr actions,
 }
 
 
+int
+qemuMonitorJSONTransactionBitmapMergeSourceAddBitmap(virJSONValuePtr sources,
+                                                     const char *sourcenode,
+                                                     const char *sourcebitmap)
+{
+    g_autoptr(virJSONValue) sourceobj = NULL;
+
+    if (virJSONValueObjectCreate(&sourceobj,
+                                 "s:node", sourcenode,
+                                 "s:name", sourcebitmap,
+                                 NULL) < 0)
+        return -1;
+
+    if (virJSONValueArrayAppend(sources, sourceobj) < 0)
+        return -1;
+
+    sourceobj = NULL;
+    return 0;
+}
+
+
 int
 qemuMonitorJSONTransactionSnapshotLegacy(virJSONValuePtr actions,
                                          const char *device,

src/qemu/qemu_monitor_json.h

@@ -669,6 +669,11 @@ qemuMonitorJSONTransactionBitmapMerge(virJSONValuePtr actions,
                                       const char *target,
                                       virJSONValuePtr *sources);
 
+int
+qemuMonitorJSONTransactionBitmapMergeSourceAddBitmap(virJSONValuePtr sources,
+                                                     const char *sourcenode,
+                                                     const char *sourcebitmap);
+
 int
 qemuMonitorJSONTransactionSnapshotLegacy(virJSONValuePtr actions,
                                          const char *device,

tests/qemumonitorjsontest.c

@@ -3018,8 +3018,8 @@ testQemuMonitorJSONTransaction(const void *opaque)
         !(mergebitmaps = virJSONValueNewArray()))
         return -1;
 
-    if (virJSONValueArrayAppendString(mergebitmaps, "mergemap1") < 0 ||
-        virJSONValueArrayAppendString(mergebitmaps, "mergemap2") < 0)
+    if (qemuMonitorTransactionBitmapMergeSourceAddBitmap(mergebitmaps, "node1", "bitmap1") < 0 ||
+        qemuMonitorTransactionBitmapMergeSourceAddBitmap(mergebitmaps, "node2", "bitmap2") < 0)
         return -1;
 
     if (qemuMonitorTransactionBitmapAdd(actions, "node1", "bitmap1", true, true) < 0 ||