linux-kernel - Re: [PATCH v2 3/3] zram: implement rw

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Date:	Mon, 20 Oct 2014 18:42:02 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	karam.lee@....com
Cc:	ngupta@...are.org, linux-kernel@...r.kernel.org,
	matthew.r.wilcox@...el.com, jmarchan@...hat.com,
	seungho1.park@....com
Subject: Re: [PATCH v2 3/3] zram: implement rw_page operation of zram

On Mon, Oct 13, 2014 at 05:55:42PM +0900, karam.lee@....com wrote:
> From: "karam.lee" <karam.lee@....com>
> 
> This patch implements rw_page operation for zram block device.

The description is not good. I know you added lots of words in
cover-letter but this patch is key so it should include more words
as well as cover-letter.

> 
> Signed-off-by: karam.lee <karam.lee@....com>
> ---
>  drivers/block/zram/zram_drv.c |   37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index b0c3a20..a44aab0 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -810,8 +810,45 @@ static void zram_slot_free_notify(struct block_device *bdev,
>  	atomic64_inc(&zram->stats.notify_free);
>  }
>  
> +static int zram_rw_page(struct block_device *bdev, sector_t sector,
> +		       struct page *page, int rw)
> +{
> +	int offset, ret = 1;
> +	u32 index;
> +	struct zram *zram;
> +	struct bio_vec bv;
> +
> +	zram = bdev->bd_disk->private_data;
> +	if (!valid_io_request(zram, sector, PAGE_SIZE)) {
> +		atomic64_inc(&zram->stats.invalid_io);

-EINVAL?

Otherwise, looks good to me.

Acked-by: Minchan Kim <minchan@...nel.org>


> +		goto out;
> +	}
> +
> +	down_read(&zram->init_lock);
> +	if (unlikely(!init_done(zram))) {
> +		ret = -ENOMEM;
> +		goto out_unlock;
> +	}
> +
> +	index = sector >> SECTORS_PER_PAGE_SHIFT;
> +	offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT;
> +
> +	bv.bv_page = page;
> +	bv.bv_len = PAGE_SIZE;
> +	bv.bv_offset = 0;
> +
> +	ret = zram_bvec_rw(zram, &bv, index, offset, rw);
> +	page_endio(page, rw, ret);
> +
> +out_unlock:
> +	up_read(&zram->init_lock);
> +out:
> +	return ret;
> +}
> +
>  static const struct block_device_operations zram_devops = {
>  	.swap_slot_free_notify = zram_slot_free_notify,
> +	.rw_page = zram_rw_page,
>  	.owner = THIS_MODULE
>  };
>  
> -- 
> 1.7.9.5
> 
> --
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-- 
Kind regards,
Minchan Kim
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