linux-kernel - Re: [PATCH v5 10/12] block: Add bio_clone

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Date:	Wed, 8 Aug 2012 16:15:52 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, axboe@...nel.dk, agk@...hat.com,
	neilb@...e.de, drbd-dev@...ts.linbit.com, vgoyal@...hat.com,
	mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net
Subject: Re: [PATCH v5 10/12] block: Add bio_clone_kmalloc()

On Mon, Aug 06, 2012 at 03:08:39PM -0700, Kent Overstreet wrote:

How about the following?

There was no API to kmalloc bio and clone and osdblk was using
explicit bio_kmalloc() + __bio_clone().  (my guess here) As this is
inconvenient and there will be more users of it in the future, add
bio_clone_kmalloc() and use it in osdblk.

> Acked-by: Boaz Harrosh <bharrosh@...asas.com>
> Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
> ---
>  drivers/block/osdblk.c |    3 +--
>  fs/bio.c               |   13 +++++++++++++
>  fs/exofs/ore.c         |    5 ++---
>  include/linux/bio.h    |    1 +
>  4 files changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
> index 87311eb..1bbc681 100644
> --- a/drivers/block/osdblk.c
> +++ b/drivers/block/osdblk.c
> @@ -266,11 +266,10 @@ static struct bio *bio_chain_clone(struct bio *old_chain, gfp_t gfpmask)
>  	struct bio *tmp, *new_chain = NULL, *tail = NULL;
>  
>  	while (old_chain) {
> -		tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs);
> +		tmp = bio_clone_kmalloc(old_chain, gfpmask);
>  		if (!tmp)
>  			goto err_out;
>  
> -		__bio_clone(tmp, old_chain);
>  		tmp->bi_bdev = NULL;
>  		gfpmask &= ~__GFP_WAIT;
>  		tmp->bi_next = NULL;
> diff --git a/fs/bio.c b/fs/bio.c
> index f0c865b..77b9313 100644
> --- a/fs/bio.c
> +++ b/fs/bio.c
> @@ -497,6 +497,19 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
>  }
>  EXPORT_SYMBOL(bio_clone);
>  

/**

PLEASE.

> +struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
> +{
> +	struct bio *b = bio_kmalloc(gfp_mask, bio->bi_max_vecs);

Can't we use %NULL bioset as an indication to allocate from kmalloc
instead of duping interfaces like this?

Thanks.

-- 
tejun
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