[PATCH 0/4] xfs: online relabeling [RFC]

[Eric Sandeen]

Ok, this more or less works; not really up to snuff
for submission or merging, just sketching it out, but some
questions first:

1) Is there really any point to this? :) We did have one
   request, and btrfs can do it ...

2) Is using m_growlock horrible?  growfs is the only other
   thing that writes all supers, so I grabbed it.  We don't
   want multiple relabels stepping on each other.

3) Is there some way to actually force the primary to disk?
   Right now the label change isn't actually visible on the
   primary until unmount, which defeats the purpose.  I'm not
   sure if there's a straightforward/safe way to make it
   visible...

Thanks,
-Eric