On 8/27/22 15:48, Al Viro wrote: > On Sat, Aug 27, 2022 at 01:36:06AM -0700, John Hubbard wrote: >> Convert the NFS Direct IO layer to use pin_user_pages_fast() and >> unpin_user_page(), instead of get_user_pages_fast() and put_page(). > > Again, this stuff can be hit with ITER_BVEC iterators > >> - result = iov_iter_get_pages_alloc2(iter, &pagevec, >> + result = dio_w_iov_iter_pin_pages_alloc(iter, &pagevec, >> rsize, &pgbase); > > and this will break on those. If anyone has an example handy, of a user space program that leads to this situation (O_DIRECT with ITER_BVEC), it would really help me reach enlightenment a lot quicker in this area. :) thanks, -- John Hubbard NVIDIA
