Add more comments on linked attribute limitations

[Andrew Bartlett]

On Tue, 2018-10-30 at 10:35 +0100, Stefan Metzmacher wrote:
> Am 30.10.18 um 10:33 schrieb Stefan Metzmacher via samba-technical:
> > Hi Tim, hi Andrew,
> > 
> > > RB+ with the suggested changes.diff attached. I attached an updated
> > > version of the original patch too.
> > > 
> > > Suggested changes:
> > > - replmd_delete_internals(): I just moved the comment up a bit. (I found
> > > it a bit confusing to talk about not finding backlinks when we clearly
> > > had found one).
> > > - replmd_process_linked_attribute(): this function is complex enough,
> > > and replmd_delete_link_value() should already cover the DRS code-path.
> > > It might be better sticking a comment in linked_attributes.c instead.
> > > - minor elaboration on "filtering at runtime" and fixed typo.
> > > 
> > > On 30/10/18 4:01 PM, Andrew Bartlett wrote:
> > > > G'Day,
> > > > 
> > > > While reviewing https://gitlab.com/samba-team/samba/merge_requests/90 I
> > > > forgot how bad the limitations on our linked attribute handling are.
> > 
> > I've included this into my branch.
> > 
> > > > This commit just tries to add some more warnings that might help remind
> > > > the next person trying to remember why we can't have nice things.
> > > > 
> > > > Please review so I can push with metze's patches.
> > 
> > Can I assume I can add a review tag to my patches and push them to master?
> 
> Ok, a moment after I sent this, the mail on samba-cvs arrived,
> so it's in master now!

Thank you so much for your hard work and patience on this.

On reflection, we will probably follow up with even more comment
blocks, explaining that most of the time (unless in windows 2000 FL),
linked_attributes.c does not create or delete the linked attributes.

Andrew Bartlett
-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba