Upgrading on encrypted partitions from Squeeze to Wheezy

[alois.mahdal.1-ndmail@zxcvb.cz]

Hello,

I have quite fresh installation with Squeeze here and
I want to upgrade it to Wheezy.

In [upgrade guide][1], I read:

> Support for cryptoloop has been dropped from the
> Linux kernel packages included in Debian 7.0. Existing
> installations using cryptoloop need to be transitioned
> to dm-crypt before the upgrade.

  [1]:
http://www.debian.org/releases/wheezy/amd64/release-notes/ch-upgrading.en.html#recovery

Since I was installing to crypto volumes (completely new
laptop with empty HDD) for first time, I left all installer's
choices intact.   And I don't remember what it was.

I'm assuming that Squeeze might have supported (and offered
as default) the newer method.  So how do I check whether my
partitions are encrypted this or other method?

And if I need to do the transfer, will this mean that I need
to re-encrypt the whole volume again?  Can I avoid/postpone
that easily?

Thanks,
aL.

--
Alois Mahdal