On Tue, Aug 30, 2022 at 09:18:40PM -0700, John Hubbard wrote: > Provide two new wrapper routines that are intended for user space pages > only: > > iov_iter_pin_pages() > iov_iter_pin_pages_alloc() > > Internally, these routines call pin_user_pages_fast(), instead of > get_user_pages_fast(), for user_backed_iter(i) and iov_iter_bvec(i) > cases. > > As always, callers must use unpin_user_pages() or a suitable FOLL_PIN > variant, to release the pages, if they actually were acquired via > pin_user_pages_fast(). > > This is a prerequisite to converting bio/block layers over to use > pin_user_pages_fast(). What of ITER_PIPE (splice from O_DIRECT fd to a to pipe, for filesystem that uses generic_file_splice_read())?
