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It's a bit confusing to mix low-level and high-level libraries. We had
multiple libraries in one directory, and there were have circular
dependencies with other libraries outside that directory (in this case,
samba-hostconfig).
Autobuild-User: Jelmer Vernooij <jelmer@samba.org>
Autobuild-Date: Sat Mar 10 23:13:01 CET 2012 on sn-devel-104
Because revoking read-only copies of records is expensive, we only
want ctdbd to do it for high-turnover records. A basic heuristic is
that if we don't find a local copy of the record, don't ask for a
read-only copy.
The fetch itself will cause ctdbd to migrate the record, so eventually
we will have a local copy. Next time it gets migrated away, we'll
call ctdbd_fetch() with local_copy = true.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The new read-only record flags make determining if we can use a record
a bit more complex, so extract it into its own function.
The OLD logic was:
1) If the record doesn't exist, we can't use it.
2) If we are the dmaster for the record, we can use it.
The new logic is:
1) If the record doesn't exist, we can't use it.
2) If we are the dmaster for the record, we can use it IF we only
want read-only access, OR there are no read-only delegations.
3) If we are not dmaster, we can only use it if we want read-only
access and it is marked as a read-only copy.
This logic is unused until the next patches which begin to ask
for read-only copies of records.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
we were filling our logs with lock ordering debug lines
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Mon Feb 27 12:50:29 CET 2012 on sn-devel-104
This makes sure we do not deadlock from doing two dbwrap_fetch_locked in two
processes in different orders. At open time, we assign a strict order to all
databases. lock_order 1 will be locked first, lock_order 2 second. No two
records of the same lock order may be locked at the same time.
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: Thu Dec 15 17:41:53 CET 2011 on sn-devel-104
Also, the parser now returns void. The parser is called if and only if
dbwrap_parse_record returns NT_STATUS_OK.
Signed-off-by: Michael Adam <obnox@samba.org>
This passes down a struct loadparm_context to allow these
parameters to be checked. This may be s3 or s4 context, allowing the
#if _SAMBA_BUILD_ macro to go away safely.
Andrew Bartlett
it was only used by ctdb_replay_transaction and was a actually write only
Signed-off-by: Michael Adam <obnox@samba.org>
Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Wed Oct 12 05:20:36 CEST 2011 on sn-devel-104
for consistency and better error propagation
Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Tue Oct 11 15:51:00 CEST 2011 on sn-devel-104
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.
