dm-raid: use set_capacity_and_notify

Use set_capacity_and_notify to set the size of both the disk and block
device.  This also gets the uevent notifications for the resize for free.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/dm-raid.c

@@ -700,8 +700,7 @@ static void rs_set_capacity(struct raid_set *rs)
 {
 	struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
 
-	set_capacity(gendisk, rs->md.array_sectors);
-	revalidate_disk_size(gendisk, true);
+	set_capacity_and_notify(gendisk, rs->md.array_sectors);
 }
 
 /*