Comment # 4 on bug 1212853 from Eyad Issa

(In reply to Matt Weber from comment #3)
> So if you LUKS encrypt root,
> /home, and [SWAP], you would need to type 3 passwords during boot.  The only
> exception would be if @/home was a logical volume under root, in which case
> it would be decrypted once root is decrypted.    

So I guess the second password is for the swap, because the root partition
should be handled automatically by GRUB passing the password to the initramfs.

> Once other note: 
> Since [SWAP] is encrypted, you may have difficulty resuming from a Hibernate
> sleep state if you ever put the system in Hibernate mode.  Personally I'm
> not sure why anyone would do this because it's faster to boot the system
> from a shutdown, so this is really just an FYI.

It was available on the setup and I decided to do it because if the PC gets
stolen while hybernating it could means data is in swap. On the other hand, I
will probably remove it and replace it with a btrfs swap subvolume.