How would you implement a swap on such a filesystem? You couldn't, could you? I guess that's mostly a non-issue, as on Linux you usually don't use a swap file

How would you implement a swap on such a filesystem? You couldn't, could you? I guess that's mostly a non-issue, as on Linux you usually don't use a swap file but a whole volume. There is support for using files, but you only use it as a last resort. Let's face it, if you know how to set up NILFS2 then you're probably able to create a swap partition.