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SubjectRe: [PATCH 00/10] iov_iter: Add new iters and use with AFS
On Thu, Sep 13, 2018 at 05:18:23PM +0100, David Howells wrote:
> Matthew Wilcox <willy@infradead.org> 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.
>
> I thought about that, but the zero-filling is not as easy to implement as the
> discard side - plus I don't have any use case to test it with.
>
> Do you have a use case in mind?

At the time I did it, it was useful in dax, but I don't know if it is
any more. It might serve to replace iov_iter_zero().

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