Revision 1:
  Documentation for the linear target.  The last 2 scripts still need
  testing.

Revision 2:
  dm-io

Revision 3:
  kcopyd

Revision 4:
  snapshot target

Revision 5:
  mirror target

Revision 6:
  dm-zero

Revision 7:
  Multipath target

Revision 8:
  Flakey target

Revision 9:
  dm-multipath: ps-refcount.patch
  Fixes the refcounting on the path-selectors. And, exports the
  register/unregister functions.
  [Mike Christie]

Revision 10:
  dm-multipath: mv-path-code-to-ps.patch
  Some path-selectors will want to choose paths that have a couple of failed
  IOs vs always failing paths with X number of failures. Also some path-
  selectors will want to select a path by detecting congestion or some other
  determination than X bios have been sent.
  [Mike Christie]

Revision 11:
  dm-multipath: ps-init-fn.patch
  This adds the ps-init function.
  [Mike Christie]