Re: [PATCH 00/10] iov_iter: Add new iters and use with AFS

[Matthew Wilcox]

On Thu, Sep 13, 2018 at 04:51:35PM +0100, David Howells wrote:
>  (5) Add an ITER_DISCARD iterator type.  This provides an iterator that
>      simply discards anything written to it.  It cannot be used as a data
>      source.

May I suggest an ITER_ZERO iterator type instead?  It acts like /dev/zero;
writes are discarded (as you have here) and reads return zeroes.
I've wanted such a thing in the past, but got distracted away from
that project.