linux-kernel - Re: [PATCH 09/13] block: Add an explicit bio flag for bios that own their bvec

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Message-ID: <20120518163018.GI19388@google.com>
Date:	Fri, 18 May 2012 09:30:18 -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 09/13] block: Add an explicit bio flag for bios that
 own their bvec

On Thu, May 17, 2012 at 10:59:56PM -0400, koverstreet@...gle.com wrote:
> From: Kent Overstreet <koverstreet@...gle.com>
> 
> This is for the new bio splitting code. When we split a bio, if the
> split occured on a bvec boundry we reuse the bvec for the new bio. But
> that means bio_free() can't free it, hence the explicit flag.
> 
> Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
> ---
>  fs/bio.c                  |    3 ++-
>  include/linux/blk_types.h |    1 +
>  2 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/bio.c b/fs/bio.c
> index ecc9088..3332800 100644
> --- a/fs/bio.c
> +++ b/fs/bio.c
> @@ -234,7 +234,7 @@ void bio_free(struct bio *bio, struct bio_set *bs)
>  {
>  	void *p;
>  
> -	if (bio_has_allocated_vec(bio))
> +	if (bio_flagged(bio, BIO_HAS_VEC))
>  		bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));

We can remove bio_has_allocated_vec()?

Thanks.

-- 
tejun
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