linux-kernel - Re: [PATCH] Add a tracepoint for block request remapping

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Date:	Fri, 18 Sep 2009 13:57:28 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
CC:	linux-kernel@...r.kernel.org,
	device-mapper development <dm-devel@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Alasdair G Kergon <agk@...hat.com>
Subject: Re: [PATCH] Add a tracepoint for block request remapping

Jun'ichi Nomura wrote:
> Since 2.6.31 now has request-based device-mapper, it's useful to have
> a tracepoint for request-remapping as well as bio-remapping.
> 
> This patch adds a tracepoint for request-remapping, trace_block_rq_remap().

> Existing trace_block_remap() is left unchanged but it might be better to
> rename it to trace_block_bio_remap().

Why not. ;)

> +static void blk_add_trace_rq_remap(struct request_queue *q,
> +				   struct request *rq, dev_t dev,
> +				   sector_t from)
> +{
> +	struct blk_trace *bt = q->blk_trace;
> +	struct blk_io_trace_remap r;
> +
> +	if (likely(!bt))
> +		return;
> +
> +	r.device_from = cpu_to_be32(dev);
> +	r.device_to   = disk_devt(rq->rq_disk);

cpu_to_be32(dis_devt(...))

> +	r.sector_from = cpu_to_be64(from);
> +
> +	__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq),
> +			rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors,
> +			sizeof(r), &r);
> +}
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