git: dm_target_crypt - Fix compatibility with Linux

Alex Hornung alexh at
Fri Aug 20 23:25:32 PDT 2010

commit 7a89864aca790456f28133cb04924ae4b1364a46
Author: Alex Hornung <ahornung at>
Date:   Sat Aug 21 07:17:54 2010 +0100

    dm_target_crypt - Fix compatibility with Linux
    * The sector number that Linux' dm-crypt passes to its iv generators
      is offset another -block_offset sectors, so that the actual sector
      number is the one on the dm device, not the underlying device.
    * Also fix the plain iv generator, which is supposed to be a "32-bit
      little-endian version of the sector number"
    * Now our dm_target_crypt can read Linux' crypt disks. This was tested
      with an image using aes-cbc-essiv:sha256 and aes-cbc-plain.

Summary of changes:
 sys/dev/disk/dm/dm_target_crypt.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

DragonFly BSD source repository

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