+/*
+ * For old clients there is no direct way of knowing which filesystems
+ * a client is operating at the MGS side. But we need to pick up those
+ * clients so that the MGS can mark the corresponding filesystem as
+ * non-IR capable because old clients are not ready to be notified.
+ *
+ * This is why we have this _hack_ function. We detect the filesystem's
+ * name by hacking llog operation which is currently used by the clients
+ * to fetch configuration logs. At present this is fine because this is
+ * the ONLY llog operation between mgc and the MGS.
+ *
+ * If extra llog operation is going to be added, this function needs fixing.
+ *
+ * If releases prior than 2.0 are not supported, we can remove this function.
+ */