Re: [PATCH v6 05/34] iov_iter: Change the direction macros into an enum

[Al Viro]

On Mon, Jan 16, 2023 at 11:08:38PM +0000, David Howells wrote:
> Change the ITER_SOURCE and ITER_DEST direction macros into an enum and
> provide three new helper functions:
> 
>  iov_iter_dir() - returns the iterator direction
>  iov_iter_is_dest() - returns true if it's an ITER_DEST iterator
>  iov_iter_is_source() - returns true if it's an ITER_SOURCE iterator

What for?  We have two valid values -
	1) it is a data source
	2) it is not a data source
Why do we need to store that as an enum?