linux-kernel - Re: [PATCH v2 03/14] block: Add bio_clone

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Message-ID: <20120524184507.GD27550@redhat.com>
Date:	Thu, 24 May 2012 14:45:07 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
	dm-devel@...hat.com, linux-fsdevel@...r.kernel.org, tj@...nel.org,
	axboe@...nel.dk, agk@...hat.com, neilb@...e.de,
	drbd-dev@...ts.linbit.com, bharrosh@...asas.com,
	mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net
Subject: Re: [PATCH v2 03/14] block: Add bio_clone_bioset()

On Wed, May 23, 2012 at 05:02:40PM -0700, Kent Overstreet wrote:

[..]
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1062,26 +1062,19 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
>   * Creates a bio that consists of range of complete bvecs.
>   */
>  static struct bio *clone_bio(struct bio *bio, sector_t sector,
> -			     unsigned short idx, unsigned short bv_count,
> +			     unsigned short bv_count,
>  			     unsigned int len, struct bio_set *bs)
>  {
>  	struct bio *clone;
>  
> -	clone = bio_alloc_bioset(GFP_NOIO, bio->bi_max_vecs, bs);
> -	__bio_clone(clone, bio);
> +	clone = bio_clone_bioset(bio, GFP_NOIO, bs);
>  	clone->bi_sector = sector;
> -	clone->bi_idx = idx;
> -	clone->bi_vcnt = idx + bv_count;
> +	clone->bi_vcnt = bv_count;

In last posting you said that you are going to backout this idx change
because you were not sure if it is correct. 

Thanks
Vivek
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