iov_iter_discard
iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);
iov_iter_discard(&call->def_iter, ITER_DEST, size);
iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read);
void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count);
EXPORT_SYMBOL(iov_iter_discard);
iov_iter_discard(&con->v2.in_iter, ITER_DEST, len);
iov_iter_discard(&call->iter, READ, call->req_len);
iov_iter_discard(&msg->msg_iter, ITER_DEST, count);