the callers rely upon having any iov_iter_truncate() done inside ->direct_IO() countered by iov_iter_reexpand(). Reported-by: Qian Cai <cai@redhat.com> Tested-by: Qian Cai <cai@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>