[Drbd-dev] [PATCH 09/10] drbd: use bvec_kmap_local in recv_dless_read

[Ira Weiny]

On Tue, Feb 22, 2022 at 04:51:55PM +0100, Christoph Hellwig wrote:
> Using local kmaps slightly reduces the chances to stray writes, and
> the bvec interface cleans up the code a little bit.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Reviewed-by: Ira Weiny <ira.weiny at intel.com>

> ---
>  drivers/block/drbd/drbd_receiver.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
> index 04e3ec12d8b49..fa00cf2ea9529 100644
> --- a/drivers/block/drbd/drbd_receiver.c
> +++ b/drivers/block/drbd/drbd_receiver.c
> @@ -2017,10 +2017,10 @@ static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_req
>  	D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector);
>  
>  	bio_for_each_segment(bvec, bio, iter) {
> -		void *mapped = kmap(bvec.bv_page) + bvec.bv_offset;
> +		void *mapped = bvec_kmap_local(&bvec);
>  		expect = min_t(int, data_size, bvec.bv_len);
>  		err = drbd_recv_all_warn(peer_device->connection, mapped, expect);
> -		kunmap(bvec.bv_page);
> +		kunmap_local(mapped);
>  		if (err)
>  			return err;
>  		data_size -= expect;
> -- 
> 2.30.2
> 
>