The reason why I am posting this question is that Dropbox has notified me (via e-mail), that it will soon no longer support ext2 for its desktop client.
I have a LUKS encrypted file system on top of an extended ext2 partition and I found the following "How To"s for migrating to ext4:
However, the previous "How To"s do not mention anything about what to do if you have an encrypted file system such as LUKS. Is there no difference? If there is, how does one do this migration?