linux-kernel - Re: [PATCH] block: eliminate ELEVATOR_INSERT

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Message-ID: <20110330112040.GF17523@htj.dyndns.org>
Date:	Wed, 30 Mar 2011 13:20:40 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Vivek Goyal <vgoyal@...hat.com>, Jeff Moyer <jmoyer@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel@...r.kernel.org, Chris Mason <chris.mason@...cle.com>
Subject: Re: [PATCH] block: eliminate ELEVATOR_INSERT_REQUEUE

Hello, Jens.

On Wed, Mar 30, 2011 at 12:16:13PM +0200, Jens Axboe wrote:
> @@ -261,7 +261,7 @@ static bool blk_kick_flush(struct request_queue *q)
>  	q->flush_rq.end_io = flush_end_io;
>  
>  	q->flush_pending_idx ^= 1;
> -	elv_insert(q, &q->flush_rq, ELEVATOR_INSERT_REQUEUE);
> +	__elv_add_request(q, &q->flush_rq, ELEVATOR_INSERT_FLUSH);

Shouldn't this be list_add_tail(&rq->queuelist, &q->queue_head)?
__elv_add_request(FLUSH) calls back into blk_insert_flush() which
decomposes the flush request from FS into flush sequence.
blk_kick_flush() is used to insert the decomposed sequence requests
into the dispatch queue.

Thanks.

-- 
tejun
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