Re: [PATCH 5/6] rbd: remove the ->set_read_only method

[Ilya Dryomov <idryomov@gmail.com>]

On Mon, Dec 7, 2020 at 2:21 PM Christoph Hellwig <hch@lst.de> wrote:
>
> Now that the hardware read-only state can't be changed by the BLKROSET
> ioctl, the code in this method is not required anymore.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> ---
>  drivers/block/rbd.c | 19 -------------------
>  1 file changed, 19 deletions(-)
>
> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
> index 2ed79b09439a82..2c64ca15ca079f 100644
> --- a/drivers/block/rbd.c
> +++ b/drivers/block/rbd.c
> @@ -692,29 +692,10 @@ static void rbd_release(struct gendisk *disk, fmode_t mode)
>         put_device(&rbd_dev->dev);
>  }
>
> -static int rbd_set_read_only(struct block_device *bdev, bool ro)
> -{
> -       struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
> -
> -       /*
> -        * Both images mapped read-only and snapshots can't be marked
> -        * read-write.
> -        */
> -       if (!ro) {
> -               if (rbd_is_ro(rbd_dev))
> -                       return -EROFS;
> -
> -               rbd_assert(!rbd_is_snap(rbd_dev));
> -       }
> -
> -       return 0;
> -}
> -
>  static const struct block_device_operations rbd_bd_ops = {
>         .owner                  = THIS_MODULE,
>         .open                   = rbd_open,
>         .release                = rbd_release,
> -       .set_read_only          = rbd_set_read_only,
>  };
>
>  /*
> --
> 2.29.2
>

If nothing can mess with read-only state after set_disk_ro(disk, true),
looks good.

Acked-by: Ilya Dryomov <idryomov@gmail.com>

Thanks,

                Ilya