file size support set file length

use Attr.FileSize and TotalChunkSize to determine file size

weed/shell/command_fs_du.go

@@ -70,9 +70,9 @@ func duTraverseDirectory(writer io.Writer, filerClient filer_pb.FilerClient, dir
 			}
 		} else {
 			fileBlockCount = uint64(len(entry.Chunks))
-			fileByteCount = filer2.TotalSize(entry.Chunks)
-			blockCount += uint64(len(entry.Chunks))
-			byteCount += filer2.TotalSize(entry.Chunks)
+			fileByteCount = filer2.FileSize(entry)
+			blockCount += fileBlockCount
+			byteCount += fileByteCount
 		}
 
 		if name != "" && !entry.IsDirectory {