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

[David Howells]

Matthew Wilcox <willy@xxxxxxxxxxxxx> 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?

David