rnbd: use blk_mq_alloc_disk and blk_cleanup_disk

Use blk_mq_alloc_disk and blk_cleanup_disk to simplify the gendisk and
request_queue allocation.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210602065345.355274-24-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rnbd/rnbd-clt.c

@@ -1353,18 +1353,6 @@ static void rnbd_init_mq_hw_queues(struct rnbd_clt_dev *dev)
 	}
 }
 
-static int setup_mq_dev(struct rnbd_clt_dev *dev)
-{
-	dev->queue = blk_mq_init_queue(&dev->sess->tag_set);
-	if (IS_ERR(dev->queue)) {
-		rnbd_clt_err(dev, "Initializing multiqueue queue failed, err: %ld\n",
-			      PTR_ERR(dev->queue));
-		return PTR_ERR(dev->queue);
-	}
-	rnbd_init_mq_hw_queues(dev);
-	return 0;
-}
-
 static void setup_request_queue(struct rnbd_clt_dev *dev)
 {
 	blk_queue_logical_block_size(dev->queue, dev->logical_block_size);
@@ -1393,13 +1381,13 @@ static void setup_request_queue(struct rnbd_clt_dev *dev)
 	blk_queue_io_opt(dev->queue, dev->sess->max_io_size);
 	blk_queue_virt_boundary(dev->queue, SZ_4K - 1);
 	blk_queue_write_cache(dev->queue, dev->wc, dev->fua);
-	dev->queue->queuedata = dev;
 }
 
 static void rnbd_clt_setup_gen_disk(struct rnbd_clt_dev *dev, int idx)
 {
 	dev->gd->major		= rnbd_client_major;
 	dev->gd->first_minor	= idx << RNBD_PART_BITS;
+	dev->gd->minors		= 1 << RNBD_PART_BITS;
 	dev->gd->fops		= &rnbd_client_ops;
 	dev->gd->queue		= dev->queue;
 	dev->gd->private_data	= dev;
@@ -1426,24 +1414,18 @@ static void rnbd_clt_setup_gen_disk(struct rnbd_clt_dev *dev, int idx)
 
 static int rnbd_client_setup_device(struct rnbd_clt_dev *dev)
 {
-	int err, idx = dev->clt_device_id;
+	int idx = dev->clt_device_id;
 
 	dev->size = dev->nsectors * dev->logical_block_size;
 
-	err = setup_mq_dev(dev);
-	if (err)
-		return err;
+	dev->gd = blk_mq_alloc_disk(&dev->sess->tag_set, dev);
+	if (IS_ERR(dev->gd))
+		return PTR_ERR(dev->gd);
+	dev->queue = dev->gd->queue;
+	rnbd_init_mq_hw_queues(dev);
 
 	setup_request_queue(dev);
-
-	dev->gd = alloc_disk_node(1 << RNBD_PART_BITS,	NUMA_NO_NODE);
-	if (!dev->gd) {
-		blk_cleanup_queue(dev->queue);
-		return -ENOMEM;
-	}
-
 	rnbd_clt_setup_gen_disk(dev, idx);
-
 	return 0;
 }
 
@@ -1650,8 +1632,7 @@ struct rnbd_clt_dev *rnbd_clt_map_device(const char *sessname,
 static void destroy_gen_disk(struct rnbd_clt_dev *dev)
 {
 	del_gendisk(dev->gd);
-	blk_cleanup_queue(dev->queue);
-	put_disk(dev->gd);
+	blk_cleanup_disk(dev->gd);
 }
 
 static void destroy_sysfs(struct rnbd_clt_dev *dev,