rbd: 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>
Acked-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rbd.c

@@ -4888,8 +4888,7 @@ static void rbd_dev_update_size(struct rbd_device *rbd_dev)
 	    !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) {
 		size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
 		dout("setting size to %llu sectors", (unsigned long long)size);
-		set_capacity(rbd_dev->disk, size);
-		revalidate_disk_size(rbd_dev->disk, true);
+		set_capacity_and_notify(rbd_dev->disk, size);
 	}
 }