HDFS-15734. [READ] DirectoryScanner#scan need not check StorageType.PROVIDED (#2559)

Co-authored-by: wangyuxuan <wangyuxuan@xiaomi.com>
(cherry picked from commit 1e32ab7d2fa83ad4119954b32a3a8daac9d08134)
(cherry picked from commit 52a46f064a70505034367cffc32dfa1fabc7134b)

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

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

@@ -442,8 +442,7 @@ public class DirectoryScanner implements Runnable {
         }
         // Block file and/or metadata file exists on the disk
         // Block exists in memory
-        if (info.getVolume().getStorageType() != StorageType.PROVIDED &&
-            info.getBlockFile() == null) {
+        if (info.getBlockFile() == null) {
           // Block metadata file exits and block file is missing
           addDifference(diffRecord, statsRecord, info);
         } else if (info.getGenStamp() != memBlock.getGenerationStamp()