#define OBD_BRW_READ 0x01
#define OBD_BRW_WRITE 0x02
#define OBD_BRW_RWMASK (OBD_BRW_READ | OBD_BRW_WRITE)
-#define OBD_BRW_SYNC 0x08
+#define OBD_BRW_SYNC 0x08 /* this page is a part of synchronous
+ * transfer and is not accounted in
+ * the grant. */
#define OBD_BRW_CHECK 0x10
#define OBD_BRW_FROM_GRANT 0x20 /* the osc manages this under llite */
#define OBD_BRW_GRANTED 0x40 /* the ost manages this */