Bugfix for tdb transactions

[Volker Lendecke]

On Sun, Jan 31, 2010 at 08:10:20PM +1100, tridge at samba.org wrote:
> I think if you leave the tdb->transaction->prepared boolean alone, and
> instead add a new bool to the transaction structure that gets set when
> the GLOBAL_LOCK is taken then the patch will be good.

Thanks for the review! New patch attached. This time I did
run tdbtorture, seems to survive it fine. I'll run the
original test that found the bug tomorrow (need to VPN into
the customer network).

> Thanks for finding the bug! I can imagine that this was not an easy
> one to find :-)

The main problem why it took so long was that I trusted the
tdb code... I looked everywhere but in lib/tdb, but once I had
instrumented ctdb to not use mmap so that I could see the
actual db access, it was pretty obvious what was going on.

Volker
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