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

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Date:	Mon, 28 May 2012 20:41:18 +0900
From:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
To:	Kent Overstreet <koverstreet@...gle.com>
CC:	device-mapper development <dm-devel@...hat.com>, axboe@...nel.dk,
	linux-kernel@...r.kernel.org, tj@...nel.org,
	linux-bcache@...r.kernel.org, mpatocka@...hat.com, agk@...hat.com,
	bharrosh@...asas.com, linux-fsdevel@...r.kernel.org,
	yehuda@...newdream.net, drbd-dev@...ts.linbit.com,
	vgoyal@...hat.com, sage@...dream.net
Subject: Re: [dm-devel] [PATCH v3 02/16] dm: Use bioset's front_pad for dm_rq_clone_bio_info

On 05/28/12 09:57, Jun'ichi Nomura wrote:
> On 05/26/12 05:25, Kent Overstreet wrote:
>> -	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.

Additional comment:
frontpad is not necessary if type is DM_TYPE_BIO_BASED.
Please check conditional switches done in the same function for
pools->tio_pool.

-- 
Jun'ichi Nomura, NEC Corporation
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