Revision 1:
  Add a new member to struct buffer_head called b_journal_head.  This is
  for jbd to use, rather than have it peeking a b_private for in flight
  ios.

Revision 2:
  Backport of mempool code.

Revision 3:
  Device-mapper core.

Revision 4:
  ioctl interface for dm

Revision 5:
  Kernel daemon abstraction.

Revision 6:
  kcopyd: a kernel daemon for copying parts of a disk from one place to
  another.  Used in the snapshot and mirror targets.

Revision 7:
  Block level snapshots.