sids2xids in winbind

Jeremy Allison jra at
Tue Apr 5 18:04:24 MDT 2011

On Fri, Mar 25, 2011 at 05:29:26PM +0100, Volker Lendecke wrote:
> Hi!
> Simo told me that when he changed the idmap subsystem I
> oppsed to the idea of a sids2gids operation. I was wrong,
> sorry for that. It is needed in particular in the cluster
> case where a user being member of hundreds of groups logs in
> for the first time with none of the groups in idmap yet.
> Transactions in the cluster case are pretty slow, so
> allocating all gids individually can make that login even
> time out.
> contains the code that optimizes this operation by
> coalescing all the allocations into one tdb-level
> transaction. It's quite a bit more complicated than it first
> sounds, because sid2gid needs a lookupsid first. So the
> patchset implements a proper, optimized, wb_lookupsids
> operation in winbind also available via the winbind pipe.
> To be optimized (as little roundtrips and transactions as
> sanely possible), this patchset has to fiddle with arrays a
> lot. That's why I'm asking for review here. Watch out, this
> is pretty tricky code.

Ok, I'm now trying to review this - but the url doesn't
point to the patches any more.

Can you point me to the current patchset as I'd like to
get this into v3-6-test/master asap.



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