-#define OSCC_FLAG_RECOVERING 1
-#define OSCC_FLAG_CREATING 2
-#define OSCC_FLAG_NOSPC 4 /* can't create more objects on this OST */
+#define OSCC_FLAG_RECOVERING 0x01
+#define OSCC_FLAG_CREATING 0x02
+#define OSCC_FLAG_NOSPC 0x04 /* can't create more objects on OST */
+#define OSCC_FLAG_SYNC_IN_PROGRESS 0x08 /* only allow one thread to sync */
+#define OSCC_FLAG_LOW 0x10
+#define OSCC_FLAG_EXITING 0x20