linux-kernel - Re: [PATCH 26/27] block: Add an explicit bio flag for bios that own their bvec

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Message-Id: <20130326111106.dc255f73804de1f8577fea52@linux-foundation.org>
Date:	Tue, 26 Mar 2013 11:11:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk
Subject: Re: [PATCH 26/27] block: Add an explicit bio flag for bios that own
 their bvec

On Tue, 19 Feb 2013 16:22:40 -0800 Kent Overstreet <koverstreet@...gle.com> wrote:

> 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.
> 
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -117,6 +117,7 @@ struct bio {
>   * BIO_POOL_IDX()
>   */
>  #define BIO_RESET_BITS	12
> +#define BIO_OWNS_VEC	12	/* bio_free() should free bvec */
>  
>  #define bio_flagged(bio, flag)	((bio)->bi_flags & (1 << (flag)))

The BIO_OWNS_VEC definition seems to be in the wrong place - it should
be grouped with the "bio flags" group above?

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