linux-kernel - Re: [dm-devel] [PATCH v8 3/8] dm: Use bioset's front_pad for dm_rq_clone_bio

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Message-ID: <504816AB.8080105@ce.jp.nec.com>
Date:	Thu, 06 Sep 2012 12:21:15 +0900
From:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
To:	device-mapper development <dm-devel@...hat.com>,
	Kent Overstreet <koverstreet@...gle.com>
CC:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	tj@...nel.org, Alasdair Kergon <agk@...hat.com>, vgoyal@...hat.com
Subject: Re: [dm-devel] [PATCH v8 3/8] dm: Use bioset's front_pad for dm_rq_clone_bio_info

On 09/06/12 05:27, Kent Overstreet wrote:
> @@ -2718,7 +2705,8 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity)
>  	if (!pools->tio_pool)
>  		goto free_io_pool_and_out;
>  
> -	pools->bs = bioset_create(pool_size, 0);
> +	pools->bs = bioset_create(pool_size,
> +				  offsetof(struct dm_rq_clone_bio_info, clone));
>  	if (!pools->bs)
>  		goto free_tio_pool_and_out;

frontpad is not necessary if type is DM_TYPE_BIO_BASED.

Other pool creation in that function do something like:
	pools->bs = (type == DM_TYPE_BIO_BASED) ?
		    bioset_create(pool_size, 0) :
		    bioset_create(pool_size, offsetof(struct dm_rq_clone_bio_info, clone));

-- 
Jun'ichi Nomura, NEC Corporation

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