qemu: monitor: Extract the top level format node when querying disks

To allow matching the node names gathered via 'query-named-block-nodes'
we need to query and then use the top level nodes from 'query-block'.
Add the data to the structure returned by qemuMonitorGetBlockInfo.

src/qemu/qemu_domain.h

@@ -364,6 +364,7 @@ struct qemuDomainDiskInfo {
     bool tray_open;
     bool empty;
     int io_status;
+    char *nodename;
 };
 
 typedef struct _qemuDomainHostdevPrivate qemuDomainHostdevPrivate;

src/qemu/qemu_monitor.c

@@ -2173,6 +2173,16 @@ qemuMonitorBlockIOStatusToError(const char *status)
 }
 
 
+static void
+qemuDomainDiskInfoFree(void *value, const void *name ATTRIBUTE_UNUSED)
+{
+    struct qemuDomainDiskInfo *info = value;
+
+    VIR_FREE(info->nodename);
+    VIR_FREE(info);
+}
+
+
 virHashTablePtr
 qemuMonitorGetBlockInfo(qemuMonitorPtr mon)
 {
@@ -2181,7 +2191,7 @@ qemuMonitorGetBlockInfo(qemuMonitorPtr mon)
 
     QEMU_CHECK_MONITOR_NULL(mon);
 
-    if (!(table = virHashCreate(32, virHashValueFree)))
+    if (!(table = virHashCreate(32, qemuDomainDiskInfoFree)))
         return NULL;
 
     if (mon->json)

src/qemu/qemu_monitor_json.c

@@ -1868,9 +1868,11 @@ int qemuMonitorJSONGetBlockInfo(qemuMonitorPtr mon,
 
     for (i = 0; i < virJSONValueArraySize(devices); i++) {
         virJSONValuePtr dev;
+        virJSONValuePtr image;
         struct qemuDomainDiskInfo *info;
         const char *thisdev;
         const char *status;
+        const char *nodename;
 
         if (!(dev = qemuMonitorJSONGetBlockDev(devices, i)))
             goto cleanup;
@@ -1907,8 +1909,12 @@ int qemuMonitorJSONGetBlockInfo(qemuMonitorPtr mon,
             info->tray = true;
 
         /* presence of 'inserted' notifies that a medium is in the device */
-        if (!virJSONValueObjectGetObject(dev, "inserted"))
+        if ((image = virJSONValueObjectGetObject(dev, "inserted"))) {
+            if ((nodename = virJSONValueObjectGetString(image, "node-name")))
+                ignore_value(VIR_STRDUP(info->nodename, nodename));
+        } else {
             info->empty = true;
+        }
 
         /* Missing io-status indicates no error */
         if ((status = virJSONValueObjectGetString(dev, "io-status"))) {