linux-kernel - Re: [dm-devel] [PATCH v3 02/16] dm: Use bioset's front_pad for dm_rq_clone_bio

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Message-ID: <4FC2CD93.1080009@ce.jp.nec.com>
Date:	Mon, 28 May 2012 09:57:55 +0900
From:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
To:	Kent Overstreet <koverstreet@...gle.com>
CC:	device-mapper development <dm-devel@...hat.com>,
	linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, axboe@...nel.dk,
	yehuda@...newdream.net, mpatocka@...hat.com, vgoyal@...hat.com,
	bharrosh@...asas.com, tj@...nel.org, sage@...dream.net,
	agk@...hat.com, drbd-dev@...ts.linbit.com
Subject: Re: [dm-devel] [PATCH v3 02/16] dm: Use bioset's front_pad for dm_rq_clone_bio_info

On 05/26/12 05:25, Kent Overstreet wrote:
>  struct dm_rq_clone_bio_info {
>  	struct bio *orig;
>  	struct dm_rq_target_io *tio;
> +	struct bio clone;
>  };
...
> -	pools->bs = bioset_create(pool_size, 0);
> +	pools->bs = bioset_create(pool_size,
> +				  offsetof(struct dm_rq_clone_bio_info, orig));
>  	if (!pools->bs)
>  		goto free_tio_pool_and_out;

Did you mean offset of *clone*?
"offsetof(struct dm_rq_clone_bio_info, orig)" is zero.

And now _rq_bio_info_cache has no user and can be removed.

Otherwise, I think it's nicer than the previous version.
Thank you.
-- 
Jun'ichi Nomura, NEC Corporation
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