qemu: block: Extract calls of qemuBlockGetNamedNodeData into a helper function

Create a wrapper for qemuBlockGetNamedNodeData named
qemuBlockGetNamedNodeData. The purpose of the wrapper is to integrate
the monitor handling functionality and in the future possible
qemuCaps-based flags.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_backup.c

@@ -830,10 +830,7 @@ qemuBackupBegin(virDomainObjPtr vm,
             goto endjob;
     }
 
-    if (qemuDomainObjEnterMonitorAsync(priv->driver, vm, QEMU_ASYNC_JOB_BACKUP) < 0)
-        goto endjob;
-    blockNamedNodeData = qemuMonitorBlockGetNamedNodeData(priv->mon);
-    if (qemuDomainObjExitMonitor(priv->driver, vm) < 0 || !blockNamedNodeData)
+    if (!(blockNamedNodeData = qemuBlockGetNamedNodeData(vm, QEMU_ASYNC_JOB_BACKUP)))
         goto endjob;
 
     if ((ndd = qemuBackupDiskPrepareData(vm, def, incremental, blockNamedNodeData,

src/qemu/qemu_block.c

@@ -2670,3 +2670,23 @@ qemuBlockNamedNodeDataGetBitmapByName(virHashTablePtr blockNamedNodeData,
 
     return NULL;
 }
+
+
+virHashTablePtr
+qemuBlockGetNamedNodeData(virDomainObjPtr vm,
+                          qemuDomainAsyncJob asyncJob)
+{
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+    virQEMUDriverPtr driver = priv->driver;
+    g_autoptr(virHashTable) blockNamedNodeData = NULL;
+
+    if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
+        return NULL;
+
+    blockNamedNodeData = qemuMonitorBlockGetNamedNodeData(priv->mon);
+
+    if (qemuDomainObjExitMonitor(driver, vm) < 0 || !blockNamedNodeData)
+        return NULL;
+
+    return g_steal_pointer(&blockNamedNodeData);
+}

src/qemu/qemu_block.h

@@ -208,3 +208,7 @@ qemuBlockNamedNodeDataBitmapPtr
 qemuBlockNamedNodeDataGetBitmapByName(virHashTablePtr blockNamedNodeData,
                                       virStorageSourcePtr src,
                                       const char *bitmap);
+
+virHashTablePtr
+qemuBlockGetNamedNodeData(virDomainObjPtr vm,
+                          qemuDomainAsyncJob asyncJob);

src/qemu/qemu_driver.c

@@ -15642,15 +15642,9 @@ qemuDomainSnapshotCreateDiskActive(virQEMUDriverPtr driver,
     if (!(actions = virJSONValueNewArray()))
         return -1;
 
-    if (blockdev) {
-        if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
-            return -1;
-
-        blockNamedNodeData = qemuMonitorBlockGetNamedNodeData(priv->mon);
-
-        if (qemuDomainObjExitMonitor(driver, vm) < 0 || !blockNamedNodeData)
-            return -1;
-    }
+    if (blockdev &&
+        !(blockNamedNodeData = qemuBlockGetNamedNodeData(vm, asyncJob)))
+        return -1;
 
     /* prepare a list of objects to use in the vm definition so that we don't
      * have to roll back later */
@@ -18354,9 +18348,7 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
                                                                           priv->qemuCaps)))
                 goto endjob;
         } else {
-            qemuDomainObjEnterMonitor(driver, vm);
-            blockNamedNodeData = qemuMonitorBlockGetNamedNodeData(priv->mon);
-            if (qemuDomainObjExitMonitor(driver, vm) < 0 || !blockNamedNodeData)
+            if (!(blockNamedNodeData = qemuBlockGetNamedNodeData(vm, QEMU_ASYNC_JOB_NONE)))
                 goto endjob;
 
             if (qemuBlockStorageSourceCreateDetectSize(blockNamedNodeData,