patch for user rename with tdbsam

[Simo Sorce]

On Mon, 2005-10-10 at 22:11 +0200, Volker Lendecke wrote:

> In particular with tdbsam, this *cries* for tridge's new tdb transaction
> code. I'd say this is a real reason to import it.
> 
> Start a transaction, do all the tdb stuff, try the posix script, and roll back
> if that fails.

I fully agree.

Simo.

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