HDFS-17692. [FGL] fix bug in getContentSummary method (#7233)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -3601,12 +3601,12 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     final FSPermissionChecker pc = getPermissionChecker();
     FSPermissionChecker.setOperationType(operationName);
     try {
-      readLock(RwLockMode.FS);
+      readLock(RwLockMode.GLOBAL);
       try {
         checkOperation(OperationCategory.READ);
         cs = FSDirStatAndListingOp.getContentSummary(dir, pc, src);
       } finally {
-        readUnlock(RwLockMode.FS, operationName, getLockReportInfoSupplier(src));
+        readUnlock(RwLockMode.GLOBAL, operationName, getLockReportInfoSupplier(src));
       }
     } catch (AccessControlException ace) {
       logAuditEvent(false, operationName, src);