fuse: print GETATTR flags in input

Change-Id: Idf8f8f08849b279f1c8a346112d43e0eb44f9810

fuse/print.go

@@ -77,6 +77,9 @@ var (
 		W_OK: "w",
 		R_OK: "r",
 	}
+	getAttrFlagNames = map[int64]string{
+		FUSE_GETATTR_FH: "FH",
+	}
 )
 
 func flagString(names map[int64]string, fl int64, def string) string {

fuse/print_linux.go

@@ -37,7 +37,7 @@ func (in *CreateIn) string() string {
 }
 
 func (in *GetAttrIn) string() string {
-	return fmt.Sprintf("{Fh %d}", in.Fh_)
+	return fmt.Sprintf("{Fh %d %s}", in.Fh_, flagString(getAttrFlagNames, int64(in.Flags_), ""))
 }
 
 func (in *MknodIn) string() string {