qemu: monitor: Add the 'query-nodes' argument for query-blockstats

The 'query-blockstats' command does not return statistics for the
explicitly named nodes unless the new argument is specified. Add
infrastrucuture that will allow us to use the new approach if desired.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_block.c

@@ -358,7 +358,7 @@ qemuBlockNodeNamesDetect(virQEMUDriverPtr driver,
         return -1;
 
     data = qemuMonitorQueryNamedBlockNodes(qemuDomainGetMonitor(vm));
-    blockstats = qemuMonitorQueryBlockstats(qemuDomainGetMonitor(vm));
+    blockstats = qemuMonitorQueryBlockstats(qemuDomainGetMonitor(vm), false);
 
     if (qemuDomainObjExitMonitor(driver, vm) < 0 || !data || !blockstats)
         goto cleanup;

src/qemu/qemu_monitor.c

@@ -2243,15 +2243,19 @@ qemuMonitorGetBlockInfo(qemuMonitorPtr mon)
 /**
  * qemuMonitorQueryBlockstats:
  * @mon: monitor object
+ * @nodenames: include backing chain nodes with explicitly specified name
  *
  * Returns data from a call to 'query-blockstats'.
  */
 virJSONValuePtr
-qemuMonitorQueryBlockstats(qemuMonitorPtr mon)
+qemuMonitorQueryBlockstats(qemuMonitorPtr mon,
+                           bool nodenames)
 {
     QEMU_CHECK_MONITOR_NULL(mon);
 
-    return qemuMonitorJSONQueryBlockstats(mon);
+    VIR_DEBUG("nodenames: %d", nodenames);
+
+    return qemuMonitorJSONQueryBlockstats(mon, nodenames);
 }
 
 

src/qemu/qemu_monitor.h

@@ -563,7 +563,8 @@ int qemuMonitorSetMemoryStatsPeriod(qemuMonitorPtr mon,
 int qemuMonitorBlockIOStatusToError(const char *status);
 virHashTablePtr qemuMonitorGetBlockInfo(qemuMonitorPtr mon);
 
-virJSONValuePtr qemuMonitorQueryBlockstats(qemuMonitorPtr mon);
+virJSONValuePtr qemuMonitorQueryBlockstats(qemuMonitorPtr mon,
+                                           bool nodenames);
 
 typedef struct _qemuBlockStats qemuBlockStats;
 typedef qemuBlockStats *qemuBlockStatsPtr;

src/qemu/qemu_monitor_json.c

@@ -2350,13 +2350,16 @@ qemuMonitorJSONGetOneBlockStatsInfo(virJSONValuePtr dev,
 
 
 virJSONValuePtr
-qemuMonitorJSONQueryBlockstats(qemuMonitorPtr mon)
+qemuMonitorJSONQueryBlockstats(qemuMonitorPtr mon,
+                               bool nodenames)
 {
     virJSONValuePtr cmd;
     virJSONValuePtr reply = NULL;
     virJSONValuePtr ret = NULL;
 
-    if (!(cmd = qemuMonitorJSONMakeCommand("query-blockstats", NULL)))
+    if (!(cmd = qemuMonitorJSONMakeCommand("query-blockstats",
+                                           "B:query-nodes", nodenames,
+                                           NULL)))
         return NULL;
 
     if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
@@ -2385,7 +2388,7 @@ qemuMonitorJSONGetAllBlockStatsInfo(qemuMonitorPtr mon,
     size_t i;
     virJSONValuePtr devices;
 
-    if (!(devices = qemuMonitorJSONQueryBlockstats(mon)))
+    if (!(devices = qemuMonitorJSONQueryBlockstats(mon, false)))
         return -1;
 
     for (i = 0; i < virJSONValueArraySize(devices); i++) {

src/qemu/qemu_monitor_json.h

@@ -86,7 +86,8 @@ int qemuMonitorJSONSetMemoryStatsPeriod(qemuMonitorPtr mon,
 int qemuMonitorJSONGetBlockInfo(qemuMonitorPtr mon,
                                 virHashTablePtr table);
 
-virJSONValuePtr qemuMonitorJSONQueryBlockstats(qemuMonitorPtr mon);
+virJSONValuePtr qemuMonitorJSONQueryBlockstats(qemuMonitorPtr mon,
+                                               bool nodenames);
 int qemuMonitorJSONGetAllBlockStatsInfo(qemuMonitorPtr mon,
                                         virHashTablePtr hash,
                                         bool backingChain);