[PATCH v4 04/11] block: define meta io descriptor

[Keith Busch]

On Wed, Oct 16, 2024 at 04:59:05PM +0530, Anuj Gupta wrote:
> +struct uio_meta {
> +	meta_flags_t	flags;
> +	u16		app_tag;
> +	u32		seed;
> +	struct iov_iter iter;
> +};

Is the seed used for anything other than the kernel's t10 generation and
verification? It looks like that's all it is for today, and that part is
skipped for userspace metadata, so I'm not sure we need it.

I know it's been used for passthrough commands since nvme started
supporitng it, but I don't see why the driver ever bothered. I think it
wasn't necessary and we've been carrying it forward ever since.