linux-kernel - Re: [PATCH v3 2/3] zram: change parameter from vaild_io

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Date:	Tue, 21 Oct 2014 16:09:17 +0200
From:	Jerome Marchand <jmarchan@...hat.com>
To:	karam.lee@....com, minchan@...nel.org, ngupta@...are.org,
	linux-kernel@...r.kernel.org
CC:	matthew.r.wilcox@...el.com, seungho1.park@....com
Subject: Re: [PATCH v3 2/3] zram: change parameter from vaild_io_request()

On 10/21/2014 09:27 AM, karam.lee@....com wrote:
> From: "karam.lee" <karam.lee@....com>
> 
> This patch changes parameter of valid_io_request for common usage.
> The purpose of valid_io_request() is to determine if bio request is
> valid or not.
> This patch use  I/O start address and size instead of a BIO parameter
> for common usage.
> 
> Signed-off-by: karam.lee <karam.lee@....com>

Acked-by: Jerome Marchand <jmarchan@...hat.com>

> ---
>  drivers/block/zram/zram_drv.c |   16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 54da18a..4565fdc 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -206,19 +206,18 @@ static inline int is_partial_io(struct bio_vec *bvec)
>  /*
>   * Check if request is within bounds and aligned on zram logical blocks.
>   */
> -static inline int valid_io_request(struct zram *zram, struct bio *bio)
> +static inline int valid_io_request(struct zram *zram,
> +		sector_t start, unsigned int size)
>  {
> -	u64 start, end, bound;
> +	u64 end, bound;
>  
>  	/* unaligned request */
> -	if (unlikely(bio->bi_iter.bi_sector &
> -		     (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1)))
> +	if (unlikely(start & (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1)))
>  		return 0;
> -	if (unlikely(bio->bi_iter.bi_size & (ZRAM_LOGICAL_BLOCK_SIZE - 1)))
> +	if (unlikely(size & (ZRAM_LOGICAL_BLOCK_SIZE - 1)))
>  		return 0;
>  
> -	start = bio->bi_iter.bi_sector;
> -	end = start + (bio->bi_iter.bi_size >> SECTOR_SHIFT);
> +	end = start + (size >> SECTOR_SHIFT);
>  	bound = zram->disksize >> SECTOR_SHIFT;
>  	/* out of range range */
>  	if (unlikely(start >= bound || end > bound || start > end))
> @@ -780,7 +779,8 @@ static void zram_make_request(struct request_queue *queue, struct bio *bio)
>  	if (unlikely(!init_done(zram)))
>  		goto error;
>  
> -	if (!valid_io_request(zram, bio)) {
> +	if (!valid_io_request(zram, bio->bi_iter.bi_sector,
> +					bio->bi_iter.bi_size)) {
>  		atomic64_inc(&zram->stats.invalid_io);
>  		goto error;
>  	}
> 



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