Bug#949336: clarification

[nbf]

clarification: I am testing it with a volume I created and used with 
cryptsetup 2:2.0. With 2:2.1 and 2:2.2 integritysetup-open seems to 
succeed, but the embedded ext4 filesystem cannot be used. Attempt to 
read the superblock raise I/O errors due to integrity mismatches.

Best,
n.b.f.