Add dm-crypt support for larger encryption sector (block) size
Issue 150 by gmazyl... on 2013-03-10 15:02:46:
dm-crypt: optionally support encryption block (sector) size (EXPERIMENTAL)
Add "block_size" optional parameter which specifies encryption
sector size (atomic unit of block device encryption).
References
http://www.saout.de/pipermail/dm-crypt/2013-January/003125.html
http://www.saout.de/pipermail/dm-crypt/2013-March/003202.html