o Cause attribute data writes to use IO_SYNC since this improves the

  chances of consistency with other file/directory meta-data in a
  write.  In the current set of extended attribute applications,
  this does not hurt much.  This should be discussed again later when
  it comes time to optimize performance of attributes.

o Include an inode generation number in the per-attribute header
  information.  This allows consistency verification to catch when
  a crash occurs, or an inode is recycled while attributes are not
  properly configured.  For now, an irritating error message is
  displayed when an inconsistency occurs.  At some point, may introduce
  an ``extattrctl check ...'' which catches these before attributes
  are enabled.  Not today.  If you get this message, it means you
  somehow managed to get your attribute backing file out of synch
  with the file system.  When this occurs, attribute not found is
  returned (== undefined).  Writes will overwrite the value there
  correcting the problem.  Might want to think about introducing
  a new errno or two to handle this kind of situation.

Discussed with:	kris

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