Re: [PATCH 4/4] xen/blkfront: cope with backend that fail empty BLKIF_OP_WRITE_BARRIER requests

[Christoph Hellwig]

>  				       info->gd->disk_name);
>  				error = -EOPNOTSUPP;
> +			}
> +			if (unlikely(bret->status == BLKIF_RSP_ERROR &&
> +				     info->shadow[id].req.nr_segments == 0)) {
> +				printk(KERN_WARNING "blkfront: %s: empty write barrier op failed\n",
> +				       info->gd->disk_name);
> +				error = -EOPNOTSUPP;
> +			}

We don't use -EOPNOTSUPP anymore in the new world order, anything
barrier related is just a normal I/O error now.

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