Revision 1:
  Keep track of allocated minor numbers with an IDR instead of a bit-set.
  (dm-use-idr.patch from 2.6.8-rc4-mm1)

Revision 2:
  Minor number allocations: (1 << MINORBITS) is not a valid minor.

Revision 3:
  Flakey target

Revision 4:
  Multipath target

Revision 5:
  dm-multipath: ps-refcount.patch
  Fixes the refcounting on the path-selectors. And, exports the
  register/unregister functions.
  
  From: Mike Christie <mikenc@us.ibm.com>

Revision 6:
  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.
  
  From: Mike Christie <mikenc@us.ibm.com>

Revision 7:
  dm-multipath: ps-init-fn.patch
  This adds the ps-init function.
  
  From: Mike Christie <mikenc@us.ibm.com>

Revision 8:
  DM_TARGET_MSG ioctl

Revision 9:
  Rename EMIT macro to DMEMIT.

Revision 10:
  Move DMEMIT definition to dm.h.

Revision 11:
  Make mirror log synchronization optional.  [HM]