Re: [dm-devel] [PATCH 11/11] xen-blkback: use bdev_discard_alignment

[Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>]

On 4/18/22 13:53, Christoph Hellwig wrote:
> Use bdev_discard_alignment to calculate the correct discard alignment
> offset even for partitions instead of just looking at the queue limit.
> 
> Also switch to use bdev_discard_granularity to get rid of the last direct
> queue reference in xen_blkbk_discard.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  drivers/block/xen-blkback/xenbus.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/block/xen-blkback/xenbus.c 
> b/drivers/block/xen-blkback/xenbus.c
> index b21bffc9c50bc..04c90cb8955f6 100644
> --- a/drivers/block/xen-blkback/xenbus.c
> +++ b/drivers/block/xen-blkback/xenbus.c
> @@ -583,14 +583,14 @@ static void xen_blkbk_discard(struct xenbus_transaction 
> xbt, struct backend_info
>       if (bdev_max_discard_sectors(bdev)) {
>               err = xenbus_printf(xbt, dev->nodename,
>                       "discard-granularity", "%u",
> -                     q->limits.discard_granularity);
> +                     bdev_discard_granularity(bdev));
>               if (err) {
>                       dev_warn(&dev->dev, "writing discard-granularity (%d)", 
> err);
>                       return;
>               }
>               err = xenbus_printf(xbt, dev->nodename,
>                       "discard-alignment", "%u",
> -                     q->limits.discard_alignment);
> +                     bdev_discard_alignment(bdev));
>               if (err) {
>                       dev_warn(&dev->dev, "writing discard-alignment (%d)", 
> err);
>                       return;

Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>

-- 
Damien Le Moal
Western Digital Research