Re: [RFC PATCH] iov_iter: Add an iterator-of-iterators

[Matthew Wilcox]

On Wed, Mar 22, 2023 at 06:15:45PM +0000, David Howells wrote:
> @@ -43,17 +44,17 @@ struct iov_iter {
>  	bool nofault;
>  	bool data_source;
>  	bool user_backed;
> -	union {
> -		size_t iov_offset;
> -		int last_offset;
> -	};
> +	bool spliceable;

We've now up to five u8s in a row here (iter_type, nofault, data_source,
user_backed).  Is it time to turn some/all of them into:

	bool nofault:1;
	bool data_source:1;
	bool user_backed:1;
	bool spliceable:1;

You can't take the address of them then, but I don't believe we do that
anywhere.