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SubjectRe: iov_iter_pipe warning.
On Mon, Sep 11, 2017 at 05:07:57AM -0700, Christoph Hellwig wrote:
> On Mon, Sep 11, 2017 at 12:07:23AM +0100, Al Viro wrote:
> > BTW, another problem I see there is that iomap_dio_actor() should *NOT*
> > assume that do-while loop in there will always manage to shove 'length'
> > bytes out in case of success. That is simply not true for pipe-backed
> > destination. And I'm not sure if outright failures halfway through
> > are handled correctly. What does it need a copy of dio->submit.iter for,
> > anyway? Why not work with dio->submit.iter directly?
> > --
>
> So that we only walk the pagetables and pin down the pages that
> we can actually use in this iteration.

Er... So why not simply do iov_iter_reexpand() in the end of segment with the
right argument? IDGI...

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