Revert "first commit (#2559)"

This reverts commit 1b94569d89.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java

@@ -506,7 +506,8 @@ private void scan() {
         }
         // Block file and/or metadata file exists on the disk
         // Block exists in memory
-        if (info.getBlockFile() == null) {
+        if (info.getVolume().getStorageType() != StorageType.PROVIDED
+            && info.getBlockFile() == null) {
           // Block metadata file exits and block file is missing
           addDifference(diffRecord, statsRecord, info);
         } else if (info.getGenStamp() != memBlock.getGenerationStamp()