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...
