dmapi attributes question

[John Groves <John@xxxxxxxxxx>]

When I set an attribute via dmapi, I haven't figured out how to retrieve 
it with attr or getfattr.  "getfattr -d" shows nothing unless there were 
attributes that I set via attr or setfattr (which show up as user 
attributes, even if set by root; I get an error if I put a '$' in front 
of the name, which I thought was the way to designate a root attribute). 

I can retrieve the dmapi attributes via dmapi, however, so I know 
they're there.  I'm using the latest CVS 2.4 kernel and xfs-cmds code 
(as of last week some time, that is).

I don't think I fully understand attribute namespaces.  I would expect 
the dmapi attributes to be in root space, I suppose (in part because I 
can't see them in the user namespace).  The attr man page says use the 
"-R" arg to access root attributes, but I get this message: "attr_get: 
Operation not supported".  The man page for getfattr doesn't mention 
root space attributes at all.

I can certainly just do my own little dmapi attribute retrieval program 
that uses dmapi to get attributes, but I would like to understand where 
dmapi attributes reside.

Thanks for any enlightenment,
John Groves