dm crypt: add null iv
dm crypt: add null iv

Add a new IV generation method 'null' to read old filesystem images created
with SuSE's loop_fish2 module.

Signed-off-by: Ludwig Nussel <400820d228e8912ee0fb946033d833e68dcf6448@suse.de>
Acked-By: Christophe Saout <0d099451edbf5d797581d87f40d0edec83ba71e3@saout.de>
Signed-off-by: Alasdair G Kergon <620085386a2c64ec2f1d43bef997c15003f13da2@redhat.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs