linux-kernel - Re: [PATCH 2/3] lightnvm: store rrpc soffset in device sector size instead of 512

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Date:	Sat, 16 Apr 2016 16:02:42 +0200
From:	Matias Bjørling <mb@...htnvm.io>
To:	Wenwei Tao <ww.tao0320@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH 2/3] lightnvm: store rrpc soffset in device sector size
 instead of 512

On 04/13/2016 10:27 AM, Wenwei Tao wrote:
> Since we mainly use soffset in device sector size, we store
> that value in rrpc->soffset to reduce doing "(ilog2(dev->sec_size) - 9)".
> 
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
>  drivers/lightnvm/rrpc.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index c0e303c..3143b98 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -1039,11 +1039,8 @@ static int rrpc_map_init(struct rrpc *rrpc)
>  {
>  	struct nvm_dev *dev = rrpc->dev;
>  	sector_t i;
> -	u64 slba;
>  	int ret;
>  
> -	slba = rrpc->soffset >> (ilog2(dev->sec_size) - 9);
> -
>  	rrpc->trans_map = vzalloc(sizeof(struct rrpc_addr) * rrpc->nr_sects);
>  	if (!rrpc->trans_map)
>  		return -ENOMEM;
> @@ -1065,8 +1062,8 @@ static int rrpc_map_init(struct rrpc *rrpc)
>  		return 0;
>  
>  	/* Bring up the mapping table from device */
> -	ret = dev->ops->get_l2p_tbl(dev, slba, rrpc->nr_sects, rrpc_l2p_update,
> -									rrpc);
> +	ret = dev->ops->get_l2p_tbl(dev, rrpc->soffset, rrpc->nr_sects,
> +					rrpc_l2p_update, rrpc);
>  	if (ret) {
>  		pr_err("nvm: rrpc: could not read L2P table.\n");
>  		return -EINVAL;
> @@ -1220,18 +1217,24 @@ static int rrpc_area_init(struct rrpc *rrpc, sector_t *begin)
>  	struct nvm_dev *dev = rrpc->dev;
>  	struct nvmm_type *mt = dev->mt;
>  	sector_t size = rrpc->nr_sects * dev->sec_size;
> +	int ret;
>  
>  	size >>= 9;
>  
> -	return mt->get_area(dev, begin, size);
> +	ret = mt->get_area(dev, begin, size);
> +	if (!ret)
> +		*begin >>= (ilog2(dev->sec_size) - 9);
> +
> +	return ret;
>  }
>  
>  static void rrpc_area_free(struct rrpc *rrpc)
>  {
>  	struct nvm_dev *dev = rrpc->dev;
>  	struct nvmm_type *mt = dev->mt;
> +	sector_t begin = rrpc->soffset << (ilog2(dev->sec_size) - 9);
>  
> -	mt->put_area(dev, rrpc->soffset);
> +	mt->put_area(dev, begin);
>  }
>  
>  static void rrpc_free(struct rrpc *rrpc)
> 

Thanks. Applied for 4.7.