a41dad90 Thu Sep 15 19:11:15 CDT 2022 Al Viro <viro@zeniv.linux.org.uk> iov_iter: saner checks for attempt to copy to/from iterator
instead of "don't do it to ITER_PIPE" check for ->data_source being false on copying from iterator. Check for !->data_source for copying to iterator, while we are at it.