I just did something without thinking much.
I had a few Gig /home partition that was done by the Fedora install. LVM, mark a large chunk of the hard drive as a PV, create a LV. Than LUKS. Than ext2. I felt a bit cramped into the small /home and thought to myself why not make it larger as advertised. Only that the old space was already in use and a previous phisical section of the hard drive was made avalable to LVM by converting another system. I just extended the /home.
Now I have a strange beast. The first 9Gb are somewhere in the last third of the hard drive. And 100Gb is somewhere in the middle of the drive. I had not expanded the ext2 disk at the moment. Because I have no idea how about LUKS.
The way I see it: 9Gb are encrypted and the rest is going to be plain, regular ext2. What can I do so the whole thing is encrypted, yet nothing changes at the setup level so it would boot in the normal way, without tweaking the configuration?