md: do not compute parity unless it is on a failed drive

[linux-2.6] / block / elevator.c

diff --git a/block/elevator.c b/block/elevator.c
index 7253fa05db0a202a020cc8d57759c038bc890d22..902dd1344d56dfb9000ba5701dbb250bcf835d27 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -488,6 +488,9 @@ int elv_merge(struct request_queue *q, struct request **req, struct bio *bio)
                }
        }
 
+       if (blk_queue_nomerges(q))
+               return ELEVATOR_NO_MERGE;
+
        /*
         * See if our hash lookup can find a potential backmerge.
         */
@@ -647,7 +650,7 @@ void elv_insert(struct request_queue *q, struct request *rq, int where)
 
        default:
                printk(KERN_ERR "%s: bad insertion point %d\n",
-                      __FUNCTION__, where);
+                      __func__, where);
                BUG();
        }
 
@@ -805,8 +808,7 @@ struct request *elv_next_request(struct request_queue *q)
                        rq->cmd_flags |= REQ_QUIET;
                        end_queued_request(rq, 0);
                } else {
-                       printk(KERN_ERR "%s: bad return=%d\n", __FUNCTION__,
-                                                               ret);
+                       printk(KERN_ERR "%s: bad return=%d\n", __func__, ret);
                        break;
                }
        }
@@ -1108,6 +1110,8 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
        queue_flag_clear(QUEUE_FLAG_ELVSWITCH, q);
        spin_unlock_irq(q->queue_lock);
 
+       blk_add_trace_msg(q, "elv switch: %s", e->elevator_type->elevator_name);
+
        return 1;
 
 fail_register: