linux-kernel - Re: [PATCH 1/3] md: align superblock writes to physical blocks

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Date:   Fri, 23 Oct 2020 09:29:27 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Christopher Unkel <cunkel@...vescale.com>
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        Song Liu <song@...nel.org>
Subject: Re: [PATCH 1/3] md: align superblock writes to physical blocks

> +	/* Respect physical block size if feasible. */
> +	bmask = queue_physical_block_size(rdev->bdev->bd_disk->queue)-1;
> +	if (!((rdev->sb_start * 512) & bmask) && (rdev->sb_size & bmask)) {
> +		int candidate_size = (rdev->sb_size | bmask) + 1;
> +
> +		if (minor_version) {
> +			int sectors = candidate_size / 512;
> +
> +			if (rdev->data_offset >= sb_start + sectors
> +			    && rdev->new_data_offset >= sb_start + sectors)

Linux coding style wants operators before the continuing line.

> +				rdev->sb_size = candidate_size;
> +		} else if (bmask <= 4095)
> +			rdev->sb_size = candidate_size;
> +	}

I also think this code would benefit from being factored into a helper.