linux-kernel - Re: [PATCH] zram: correct offset usage in zram_bio

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Message-ID: <20140422090617.GA937@swordfish.minsk.epam.com>
Date:	Tue, 22 Apr 2014 12:06:17 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Weijie Yang <weijie.yang@...sung.com>
Cc:	'Minchan Kim' <minchan@...nel.org>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Nitin Gupta' <ngupta@...are.org>, iamjoonsoo.kim@....com,
	'Sergey Senozhatsky' <sergey.senozhatsky@...il.com>,
	'Bob Liu' <bob.liu@...cle.com>,
	'linux-kernel' <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] zram: correct offset usage in zram_bio_discard

On (04/22/14 11:14), Weijie Yang wrote:
> 
> we want to skip the logical block which is partially covered by
> the discard bio, so check the remaining size and subtract it if
> there is a need to goto the next logical block.
> 

looks sane.

	-ss

> This patch corrects the offset usage in zram_bio_discard.
> 
> Signed-off-by: Weijie Yang <weijie.yang@...sung.com>
> ---
>  drivers/block/zram/zram_drv.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 9849b52..48eccb3 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -572,10 +572,10 @@ static void zram_bio_discard(struct zram *zram, u32 index,
>  	 * skipping this logical block is appropriate here.
>  	 */
>  	if (offset) {
> -		if (n < offset)
> +		if (n <= (PAGE_SIZE - offset))
>  			return;
>  
> -		n -= offset;
> +		n -= (PAGE_SIZE - offset);
>  		index++;
>  	}
>  
> -- 
> 1.7.10.4
> 
> 
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