linux-kernel - Re: [PATCH 04/13] block: Add bio_clone

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Message-ID: <20120518160903.GD19388@google.com>
Date:	Fri, 18 May 2012 09:09:03 -0700
From:	Tejun Heo <tj@...nel.org>
To:	koverstreet@...gle.com
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, linux-fsdevel@...r.kernel.org,
	axboe@...nel.dk, agk@...hat.com, neilb@...e.de
Subject: Re: [PATCH 04/13] block: Add bio_clone_kmalloc()

On Thu, May 17, 2012 at 10:59:51PM -0400, koverstreet@...gle.com wrote:
> @@ -729,7 +729,7 @@ static struct bio *bio_chain_clone(struct bio **old, struct bio **next,
>  	}
>  
>  	while (old_chain && (total < len)) {
> -		tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs);
> +		tmp = bio_clone_kmalloc(old_chain, gfpmask);
>  		if (!tmp)
>  			goto err_out;
>  
> @@ -751,13 +751,9 @@ static struct bio *bio_chain_clone(struct bio **old, struct bio **next,
>  			if (!bp)
>  				goto err_out;
>  
> -			__bio_clone(tmp, &bp->bio1);
> -

This effectively swaps the order of bio_split() and __bio_clone().  Is
that safe?  Also, please cc the maintainer.

Thanks.

-- 
tejun
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