Re: [PATCH 23/30] rnbd: use blk_mq_alloc_disk and blk_cleanup_disk

[Jinpu Wang <jinpu.wang@ionos.com>]

On Wed, Jun 2, 2021 at 8:55 AM Christoph Hellwig <hch@lst.de> wrote:
>
> 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>
> ---
>  drivers/block/rnbd/rnbd-clt.c | 35 ++++++++---------------------------
>  1 file changed, 8 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/block/rnbd/rnbd-clt.c b/drivers/block/rnbd/rnbd-clt.c
> index c604a402cd5c..f4fa45d24c0b 100644
> --- a/drivers/block/rnbd/rnbd-clt.c
> +++ b/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,
> --
> 2.30.2

Looks good to me, thx!
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
>