xattr namespace question

[Steven Whitehouse <swhiteho@redhat.com>]

Hi,

In order to remove the final ioctl() call in the GFS2 filesystem its
been suggested that we use xattrs as a replacement interface. Mostly
this is self-explanatory however there is one question that I've not
been able to resolve 100% satisfactorily, which is what the namespace
should look like.

We have a bunch of boolean flags, so (using the example of the journaled
data flag) should our xattrs be called something along the lines of
system.gfs2.jdata (this seems to be most popular suggestion amoung those
I've asked privately), or perhaps system.fs.gfs2.jdata or indeed is the
system namespace reserved for something special so that we should use a
special gfs2 namespace instead?

I've googled around and read all I can find, but I've not been able to
find a definitive answer to this question. Any pointers that you can
give would be very helpful,

Thanks,

Steve.