[ISSUE #3192] Make free disk value more accurate

make free disk value more accurate

broker/src/main/java/org/apache/rocketmq/broker/processor/AdminBrokerProcessor.java

@@ -1445,7 +1445,7 @@ public class AdminBrokerProcessor extends AsyncNettyRequestProcessor implements
 
         java.io.File commitLogDir = new java.io.File(this.brokerController.getMessageStoreConfig().getStorePathRootDir());
         if (commitLogDir.exists()) {
-            runtimeInfo.put("commitLogDirCapacity", String.format("Total : %s, Free : %s.", MixAll.humanReadableByteCount(commitLogDir.getTotalSpace(), false), MixAll.humanReadableByteCount(commitLogDir.getFreeSpace(), false)));
+            runtimeInfo.put("commitLogDirCapacity", String.format("Total : %s, Free : %s.", MixAll.humanReadableByteCount(commitLogDir.getTotalSpace(), false), MixAll.humanReadableByteCount(commitLogDir.getUsableSpace(), false)));
         }
 
         return runtimeInfo;