rnbd-srv: use bdev_discard_alignment

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2083917



commit 18292faa
Author: Christoph Hellwig <hch@lst.de>
Date:   Mon Apr 18 06:53:13 2022 +0200

    rnbd-srv: use bdev_discard_alignment

    Use bdev_discard_alignment to calculate the correct discard alignment
    offset even for partitions instead of just looking at the queue limit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
    Link: https://lore.kernel.org/r/20220418045314.360785-11-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Ming Lei <ming.lei@redhat.com>

drivers/block/rnbd/rnbd-srv-dev.h

@@ -59,7 +59,7 @@ static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
 
 static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev)
 {
-	return bdev_get_queue(dev->bdev)->limits.discard_alignment;
+	return bdev_discard_alignment(dev->bdev);
 }
 
 #endif /* RNBD_SRV_DEV_H */