[OpenAFS] OpenAFS on Linux 2.5.x

[Derek Atkins]

Jeffrey Hutzelman <jhutz@cmu.edu> writes:

> To reiterate...  Don't conflate PAG's with process groups; they do
> different things and need different scoping rules.  Though some may have
> forgotten, we've learned that lesson already -- it's why there's now a
> distinction between process groups and sessions.
> 
> PAG scoping is completely orthogonal to sessions.  Many PAGs contain
> multiple sessions, due to things like running multiple xterms each of
> which contains a session leader (as described above).  But conversely, I
> frequently have xterms which run processes in different PAG's, since I
> routinely establish new PAG's to do privileged operations.

Clearly we just need to write a patch that adds a pag_t type to struct
task, copied at fork(), and supplies a pag_create(task_t *) API to
create a new PAG in the given task.  I think that would be sufficient.
I don't think it would be a lot of code.  Is there some other API(s)
that we could need (assuming we could just use task->pag to read the
PAG out of a task).

I'd also recommend "typedef __u64 pag_t;", but we could use an "__u32"
if we wanted.

Comments?  Anyone care to write the (small) patch?  I'm willing to present
it to Linus, Alan, et al.

-derek

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available