Re: block: eliminate ELEVATOR_INSERT_REQUEUE

[Tejun Heo]

On Wed, Mar 30, 2011 at 11:22:48AM -0400, Vivek Goyal wrote:
> So wee need this as stable fix because FLUSH request can get ahead of
> REQUEUED requests and it can break some drivers?

Yes, I think so.  All we need is just replacing elv_insert() calls in
blk-flush.c with list_add_tail().  Something like the following.  I'll
test it and send a proper patch later.  Thanks.

diff --git a/block/blk-flush.c b/block/blk-flush.c
index b27d020..51a45a5 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -132,7 +132,7 @@ static struct request *queue_next_fseq(struct request_queue *q)
 		BUG();
 	}
 
-	elv_insert(q, rq, ELEVATOR_INSERT_REQUEUE);
+	list_add_tail(&rq->queuelist, &q->queue_head);
 	return rq;
 }
 

-- 
tejun
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