Revision 1:
  2.6.6-rc2

Revision 2:
  -mm1

Revision 3:
  Documentation for the linear target.  The last 2 scripts still need
  testing.

Revision 4:
  Multipath target

Revision 5:
  dm-io

Revision 6:
  kcopyd

Revision 7:
  snapshot target.

Revision 8:
  mirror target.

Revision 9:
  Exchange slow bit-by-bit count to use hweight32 to count bits per uint32_t
  [AJ Lewis]

Revision 10:
  Flakey target

Revision 11:
  dm-zero

Revision 12:
  Snapshot: Make calc_max_buckets return a constant 2M for now (need a
  proper fix for this).  [Chris Mason]

Revision 13:  *** REMOVED ***
  Drop HZ down to 100 for sane qemu behaviour.

Revision 14:
  Mirror: flush the log as soon as a region is updated.  (Needs
  testing).

Revision 15:
  dm-ioctl.c: Fix an OB1 error when calculating an output buffer size,
  that could cause a missing null termininator in the 'list devices'
  ioctl results.  [Steffan Paletta]