[Pvfs2-developers] DB transaction patch

[Julian Martin Kunkel]

Hi,
the attached patch adds a test for DB_AUTOCOMMIT to configure.
The patch includes all the previous patches to apply against the CVS version.

In case this transaction mode is usable the sync option can be set to
TroveMetaSync trans
In which the collection dbs do not sync and use transactions with the 
autocommit flag. By default all dbs are opened with transaction mode (if 
available) and later reopened without, if syncing or nosyncing is desired. 
Later we could add a coalesce functionality. The storage dbs stay in 
transaction mode all the time.

Also this patch adds checks to make sure in case no syncing is set that the 
makro DBPF_DB_SYNC_IF_NECESSARY does not sync. Hopefully I got all the sync 
spots in the code.

I think we should test the transaction mode on different systems to make sure 
that the test and the implementation works. 
Unfortunately there must be somewhere another deadlock in the code, but I will 
look for it :)
I send the patches already that we could discuss about the modifications and 
that you can try it out. 

Julian
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