linux-kernel - Re: [dm-devel] [PATCH v2 02/14] dm: kill dm_rq_bio

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Date:	Thu, 24 May 2012 09:19:12 +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 v2 02/14] dm: kill dm_rq_bio_destructor

Hi,

On 05/24/12 09:02, Kent Overstreet wrote:
> @@ -1438,15 +1439,6 @@ void dm_dispatch_request(struct request *rq)
>  }
>  EXPORT_SYMBOL_GPL(dm_dispatch_request);
>  
> -static void dm_rq_bio_destructor(struct bio *bio)
> -{
> -	struct dm_rq_clone_bio_info *info = bio->bi_private;
> -	struct mapped_device *md = info->tio->md;
> -
> -	free_bio_info(info);
> -	bio_free(bio, md->bs);
> -}
> -
>  static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig,
>  				 void *data)
>  {
> @@ -1461,7 +1453,6 @@ static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig,
>  	info->tio = tio;
>  	bio->bi_end_io = end_clone_bio;
>  	bio->bi_private = info;
> -	bio->bi_destructor = dm_rq_bio_destructor;

The destructor may also be called from blk_rq_unprep_clone(),
which just puts bio.
So this patch will introduce a memory leak.

Please check this comment as well:
https://www.redhat.com/archives/dm-devel/2012-May/msg00216.html

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation
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