linux-kernel - Re: [PATCH 07/10] block: kill merge_bvec

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Date:	Wed, 6 May 2015 09:26:37 +0200
From:	Christoph Hellwig <hch@....de>
To:	Ming Lin <mlin@...nel.org>
Cc:	NeilBrown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Dongsu Park <dongsu.park@...fitbricks.com>,
	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	drbd-user@...ts.linbit.com, Jiri Kosina <jkosina@...e.cz>,
	Yehuda Sadeh <yehuda@...tank.com>,
	Sage Weil <sage@...tank.com>, Alex Elder <elder@...nel.org>,
	ceph-devel@...r.kernel.org, Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH 07/10] block: kill merge_bvec_fn() completely

> -static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
> +static int __chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio)

Call it raid5_read_one_chunk or something similar descriptive?

>  {
>  	struct r5conf *conf = mddev->private;
>  	int dd_idx;
> @@ -4718,7 +4718,7 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
>  	sector_t end_sector;
>  
>  	if (!in_chunk_boundary(mddev, raid_bio)) {
> -		pr_debug("chunk_aligned_read : non aligned\n");
> +		pr_debug("__chunk_aligned_read : non aligned\n");

Switch to __func__?

> +static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio)
> +{
> +	struct bio *split;
> +
> +	do {
> +		sector_t sector = raid_bio->bi_iter.bi_sector;
> +		unsigned chunk_sects = mddev->chunk_sectors;
> +
> +		unsigned sectors = chunk_sects -
> +			(likely(is_power_of_2(chunk_sects))
> +			 ? (sector & (chunk_sects-1))
> +			 : sector_div(sector, chunk_sects));

This would be a lot more readable with a good old if.

>  	if (rw == READ && mddev->degraded == 0 &&
>  	     mddev->reshape_position == MaxSector &&
> -	     chunk_aligned_read(mddev,bi))
> +	     (!(bi = chunk_aligned_read(mddev, bi))))
>  		return;

	if (rw == READ && mddev->degraded == 0 &&
	    mddev->reshape_position == MaxSector) {
		bi = chunk_aligned_read(mddev, bi);
		if (!bi)
			return;
	}
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