nfs41: Backchannel: Refactor nfs4_reset_slot_table()

Generalize nfs4_reset_slot_table() so it can be used to reset the
backchannel slot table in addition to the forechannel slot table.
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

fs/nfs/nfs4proc.c

@@ -4370,19 +4370,21 @@ int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
 	return status;
 }
 
-/* Reset a slot table */
-static int nfs4_reset_slot_table(struct nfs4_session *session)
+/*
+ * Reset a slot table
+ */
+static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
+		int old_max_slots, int ivalue)
 {
-	struct nfs4_slot_table *tbl = &session->fc_slot_table;
-	int i, max_slots = session->fc_attrs.max_reqs;
-	int old_max_slots = session->fc_slot_table.max_slots;
+	int i;
 	int ret = 0;
 
-	dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__,
-		session->fc_attrs.max_reqs, tbl);
+	dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
 
-	/* Until we have dynamic slot table adjustment, insist
-	 * upon the same slot table size */
+	/*
+	 * Until we have dynamic slot table adjustment, insist
+	 * upon the same slot table size
+	 */
 	if (max_slots != old_max_slots) {
 		dprintk("%s reset slot table does't match old\n",
 			__func__);
@@ -4391,7 +4393,7 @@ static int nfs4_reset_slot_table(struct nfs4_session *session)
 	}
 	spin_lock(&tbl->slot_tbl_lock);
 	for (i = 0; i < max_slots; ++i)
-		tbl->slots[i].seq_nr = 1;
+		tbl->slots[i].seq_nr = ivalue;
 	tbl->highest_used_slotid = -1;
 	spin_unlock(&tbl->slot_tbl_lock);
 	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
@@ -4401,6 +4403,20 @@ out:
 	return ret;
 }
 
+/*
+ * Reset the forechannel and backchannel slot tables
+ */
+static int nfs4_reset_slot_tables(struct nfs4_session *session)
+{
+	int status;
+
+	status = nfs4_reset_slot_table(&session->fc_slot_table,
+			session->fc_attrs.max_reqs,
+			session->fc_slot_table.max_slots,
+			1);
+	return status;
+}
+
 /*
  * Initialize slot table
  */
@@ -4639,7 +4655,7 @@ int nfs4_proc_create_session(struct nfs_client *clp, int reset)
 
 	/* Init or reset the fore channel */
 	if (reset)
-		status = nfs4_reset_slot_table(session);
+		status = nfs4_reset_slot_tables(session);
 	else
 		status = nfs4_init_slot_table(session);
 	dprintk("fore channel slot table initialization returned %d\n", status);