Comment # 2 on bug 959988 from Ulrich Windl

LVM:
# lvs
  LV      VG   Attr       LSize   Pool    Origin Data%  Meta%  Move Log
Cpy%Sync Convert
  home    sys  -wi-ao---- 250.00g                                               
  root    sys  -wi-ao----  32.00g                                               
  var     sys  Vwi-aotz--   8.00g varpool        24.83                          
  varpool sys  twi-aotz--  16.00g                12.42  6.88                    

fstab:
# cat /etc/fstab 
/dev/mapper/cr_swap swap swap defaults 0 0
UUID=3f14e45d-12be-42ba-a05f-875f69e88290 / btrfs defaults 0 0
/dev/mapper/cr_home  /home                xfs        nofail                0 2
UUID=3f14e45d-12be-42ba-a05f-875f69e88290 /opt btrfs subvol=@/opt 0 0
UUID=3f14e45d-12be-42ba-a05f-875f69e88290 /srv btrfs subvol=@/srv 0 0
UUID=3f14e45d-12be-42ba-a05f-875f69e88290 /tmp btrfs subvol=@/tmp 0 0
UUID=3f14e45d-12be-42ba-a05f-875f69e88290 /usr/local btrfs subvol=@/usr/local 0
0
UUID=3f14e45d-12be-42ba-a05f-875f69e88290 /.snapshots btrfs subvol=@/.snapshots
0 0
UUID=0268f4f3-1d71-4f98-818e-21d46454616c /boot                ext3      
acl,user_xattr        1 2
UUID=f93af6df-74b3-4846-afb1-da3a15030e22 /var                 btrfs     
defaults              0 0

Swap:
# cryptsetup luksDump /dev/sdb2 
LUKS header information for /dev/sdb2

Version:           1
Cipher name:       aes
Cipher mode:       xts-plain64
Hash spec:         sha1
Payload offset:    4096
MK bits:           256
MK digest:         <removed>
MK salt:           <removed>
MK iterations:     19875
UUID:              75271dab-b04b-430d-848f-322948deca8c

Key Slot 0: ENABLED
    Iterations:             <removed>
    Salt:                   <removed> 
    Key material offset:    8
    AF stripes:                4000
Key Slot 1: DISABLED
Key Slot 2: DISABLED
Key Slot 3: DISABLED
Key Slot 4: DISABLED
Key Slot 5: DISABLED
Key Slot 6: DISABLED
Key Slot 7: DISABLED

Home:
# cryptsetup luksDump /dev/sys/home 
LUKS header information for /dev/sys/home

Version:           1
Cipher name:       aes
Cipher mode:       xts-plain64
Hash spec:         sha1
Payload offset:    4096
MK bits:           256
MK digest:         <removed>
MK salt:           <removed>
MK iterations:     20125
UUID:              f1ac4f6a-20f9-48db-949d-f1c0c7f1e06e

Key Slot 0: ENABLED
    Iterations:             <removed>
    Salt:                   <removed>
    Key material offset:    8
    AF stripes:                4000
Key Slot 1: DISABLED
Key Slot 2: DISABLED
Key Slot 3: DISABLED
Key Slot 4: DISABLED
Key Slot 5: DISABLED
Key Slot 6: DISABLED
Key Slot 7: DISABLED

So this correction applies (sorry for mixing it up): swap and HOME are
encrypted, not ROOT.