[PATCH v4 11/18] nvme: Add pr_ops read_keys support

[Christoph Hellwig]

On Fri, Feb 24, 2023 at 11:44:55AM -0600, Mike Christie wrote:
> +	/*
> +	 * Assume we are using 128-bit host IDs and allocate a buffer large
> +	 * enough to get enough keys to fill the return keys buffer.
> +	 */
> +	rs_len = sizeof(*rs) +
> +			num_keys * sizeof(struct nvme_registered_ctrl_ext);

Any reason not to use struct_size() here?  Or does the union prevent
us from doing so?

Otherwise this looks good to me.