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Also check for allocation failures, and ensure that the regdb refcount
is not set by regdb_open() on failure.
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This is in preparation to support handing flags to backends,
in particular activating read only record support for ctdb
databases. For a start, this does nothing but adding the
parameter, and all databases use DBWRAP_FLAG_NONE.
Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This prevents race between fetching seqnum and key content.
Because there is currently no way to atomically fetch the
record along with the seqnum, I use a loop.
This is far from optimal and should should ideally be done
differently. But for now it fixes the race.
Signed-off-by: Andreas Schneider <asn@samba.org>
This prevents race between fetching seqnum and key content.
Because there is currently no way to atomically fetch the
record along with the seqnum, I use a loop.
This is far from optimal and should should ideally be done
differently. But for now it fixes the race.
Signed-off-by: Andreas Schneider <asn@samba.org>
The purpose is to prevent next reads from going to disk.
Note that this will currently only be effective with local tdbs, not
with ctdb: For tdb, store and delete bump the seqnum while transaction
commit does not. For ctdb, transaction commit bumps the seqnum, while
store and delete don't... This needs fixing (in ctdb).
Signed-off-by: Andreas Schneider <asn@samba.org>
Note that this will currently only be effective in the local TDB implementation.
For CTDB, this wont work since seqnum currently works differently there (needs
fixing): For tdb, store and delete operations bump the db seqnum, while
transaction commits don't. For ctdb, the seqnum is bumped by the transaction
commit but not by store and delete operations.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Michael Adam <obnox@samba.org>
Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Tue Jan 24 13:54:09 CET 2012 on sn-devel-104
This will be used to enforce a lock hierarchy between the databases. We have
seen deadlocks between locking.tdb, brlock.tdb, serverid.tdb and notify*.tdb.
These should be fixed by refusing a dbwrap_fetch_locked that does not follow a
defined lock hierarchy.
Signed-off-by: Michael Adam <obnox@samba.org>
Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Sat Dec 3 05:20:30 CET 2011 on sn-devel-104
It is importante to not use the database backend implementation
in the upgrade. Otherwise this would only work as long as this
is the newset version. In future versions of the registry, this
(then) intermediate upgrade step would change in behaviour and not
work as expected any more.
Signed-off-by: Michael Adam <obnox@samba.org>
Skip the transaction for the upgrade code, if the database
is already at code-level.
Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Wed Nov 9 15:06:59 CET 2011 on sn-devel-104
Originally, this function did not create the key's subkey list record if only
the record was listed in the subkeylist of its parent key. Now this is fixed.
Pair-Programmed-With: Gregor Beck <gbeck@sernet.de>
Return the int32 value retrieved from the db by reference.
Before this, return value "-1" was used as a error indication,
but it could also be a valid value from the database.
