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

[Martin K. Petersen]

Anuj,

> +struct uio_meta {
> +	meta_flags_t	flags;
> +	u16		app_tag;
> +	u32		seed;
> +	struct iov_iter iter;
> +};

Glad to see the seed added. In NVMe it can be a 64-bit value so we
should bump the size of that field in the user API.

Not sure what to do about the storage tag. For Linux that would probably
be owned by the filesystem (as opposed to the application). But I guess
one could envision a userland application acting as a storage target and
in that case the tag would need to be passed to the kernel.

-- 
Martin K. Petersen	Oracle Linux Engineering