linux-kernel - Re: [PATCH 05/13] block: Only clone bio vecs that are in use

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Message-ID: <20120518161334.GE19388@google.com>
Date:	Fri, 18 May 2012 09:13:34 -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 05/13] block: Only clone bio vecs that are in use

On Thu, May 17, 2012 at 10:59:52PM -0400, koverstreet@...gle.com wrote:
> diff --git a/fs/bio.c b/fs/bio.c
> index e2c0970..de0733e 100644
> --- a/fs/bio.c
> +++ b/fs/bio.c
> @@ -435,8 +435,9 @@ EXPORT_SYMBOL(bio_phys_segments);
>   */
>  void __bio_clone(struct bio *bio, struct bio *bio_src)
>  {
> -	memcpy(bio->bi_io_vec, bio_src->bi_io_vec,
> -		bio_src->bi_max_vecs * sizeof(struct bio_vec));
> +	memcpy(bio->bi_io_vec,
> +	       bio_iovec(bio_src),

Unnecessary line break.

> +	       bio_segments(bio_src) * sizeof(struct bio_vec));
>  
>  	/*
>  	 * most users will be overriding ->bi_bdev with a new target,
> @@ -445,10 +446,10 @@ void __bio_clone(struct bio *bio, struct bio *bio_src)
>  	bio->bi_sector = bio_src->bi_sector;
>  	bio->bi_bdev = bio_src->bi_bdev;
>  	bio->bi_flags |= 1 << BIO_CLONED;
> +	bio->bi_flags &= ~(1 << BIO_SEG_VALID);

Can probably be conditionalized on bi_idx?

Thanks.

-- 
tejun
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