shell: do not need to lock to see volume -h

weed/shell/command_volume_tier_download.go

@@ -43,10 +43,6 @@ func (c *commandVolumeTierDownload) Help() string {
 
 func (c *commandVolumeTierDownload) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
 
-	if err = commandEnv.confirmIsLocked(); err != nil {
-		return
-	}
-
 	tierCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 	volumeId := tierCommand.Int("volumeId", 0, "the volume id")
 	collection := tierCommand.String("collection", "", "the collection name")
@@ -54,6 +50,10 @@ func (c *commandVolumeTierDownload) Do(args []string, commandEnv *CommandEnv, wr
 		return nil
 	}
 
+	if err = commandEnv.confirmIsLocked(); err != nil {
+		return
+	}
+
 	vid := needle.VolumeId(*volumeId)
 
 	// collect topology information