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Autobuild-User: Volker Lendecke <vl@samba.org>
Autobuild-Date: Fri Apr 20 17:05:52 CEST 2012 on sn-devel-104
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With this API you can asynchronously wait for a record to be modified
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This is a per-db function that is called whenever some record is modified
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This returns a blob uniquely identifying the database
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We can assume that the rbt dbs are around
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This will allow db_open_tdb() to be called from common code, which may
already have a loadparm context loaded.
It also slowly moves the lp_ctx up the stack, as required to remove
the library loop between smbconf and the registry.
Andrew Bartlett
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This is in preperation for calling dbwrap from common code, where we may not
have a stackframe set up.
Andrew Bartlett
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This is designed to spread the load on individual ctdb records to allow upper
layers to do backoff mechanisms. In the ctdb case, do not get the record if a
local lock is already taken. If we are not dmaster, do at most one migrate
attempt.
For the tdb case, this is a nonblocking fetch_locked. If someone else has the
lock, give up.
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This is a caching layer for the notify database and potentially for the brlock
database. It caches the parse_record operation as long as the underlying seqnum
does not change.
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All callers had that fallback
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Autobuild-User: Volker Lendecke <vl@samba.org>
Autobuild-Date: Sat Apr 7 14:10:35 CEST 2012 on sn-devel-104
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Autobuild-User: Volker Lendecke <vl@samba.org>
Autobuild-Date: Tue Apr 3 15:17:11 CEST 2012 on sn-devel-104
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Autobuild-User: Volker Lendecke <vl@samba.org>
Autobuild-Date: Fri Mar 30 16:52:16 CEST 2012 on sn-devel-104
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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
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Autobuild-User: Amitay Isaacs <amitay@samba.org>
Autobuild-Date: Mon Mar 5 02:47:36 CET 2012 on sn-devel-104
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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>
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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>
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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
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Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Wed Jan 18 16:21:52 CET 2012 on sn-devel-104
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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.
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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.
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use the TDB ecode to determine the NTSTATUS return value
and not the return code that is just -1
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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
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Signed-off-by: Michael Adam <obnox@samba.org>
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Signed-off-by: Michael Adam <obnox@samba.org>
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This is in preparation to remove the db_context->fetch function pointer
Signed-off-by: Michael Adam <obnox@samba.org>
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Signed-off-by: Michael Adam <obnox@samba.org>
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Signed-off-by: Michael Adam <obnox@samba.org>
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Signed-off-by: Michael Adam <obnox@samba.org>
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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>
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Introduce a local variable for the result, replace "state->result" by "result"
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Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Fri Dec 9 13:37:51 CET 2011 on sn-devel-104
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Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Thu Dec 8 16:39:29 CET 2011 on sn-devel-104
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We have the private fallback in dbwrap_parse_record anyway
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