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The only reason for this complex monster was an overload of ctdbd.
When opening files, we unconditionally checked all share modes for
validity. This meant thousands of serverid_exists calls per second
for popular directories. This has long gone, now we only check for
validity if a conflict happens.
The only remaining caller is net serverid wipedbs, an administrative
command. If that loads ctdbd, so be it.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This is a relevant change: I was experimenting with
server_id_db_set_exclusive() in "net" and got failures all over the
place. The main reason was that "net" by default does not do a
serverid_register. With messaging_dgm we have the process' unique
id available via the lockfile contents. Using open/read/close is a
bit slower than local tdb access, but this version is safe for all
processes which have done messaging_init()
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We should not create an empty local serverid.tdb in a cluster setup...
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
All ctdb specific code is isolated in samba-cluster-support.so now.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Mon Mar 24 19:08:44 CET 2014 on sn-devel-104
This is better than a compile time check for
HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@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 helps clarify the role of this structure and wrapper function.
The purpose here is to provide helper functions to the lib/param
loadparm_context that point back at the s3 lp_ functions. This allows
a struct loadparm_context to be passed to any point in the code, and
always refer to the correct loadparm system. If this has not been
set, the variables loaded in the lib/param code will be returned.
As requested by Michael Adam.
Andrew Bartlett
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Wed Jun 27 17:11:16 CEST 2012 on sn-devel-104
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
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.
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 should be a lot quicker than PROCESS_EXISTS followed by looking at
serverid.tdb
Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Wed Nov 30 12:47:27 CET 2011 on sn-devel-104
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
This also fixes the return value: originally the int return value
of traverse_read which is a count of the records traversed or negative
upon failure, was simply casted into a bool return value.
This also fixes the return value: Originally, the int returned
by the traverse method, which is the count of the traverse was
casted into a bool return value.
procid_is_me() works fine in the clustering case as well
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Mon Aug 22 21:28:13 CEST 2011 on sn-devel-104
clustered. procid_is_me() is much cheaper to test and can optimize
up to 50% of the calls to serverid_exists(). Volker please check.
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Sat Aug 20 01:15:07 CEST 2011 on sn-devel-104
Also start new folder lib/dbwrap/ where dbwrap_open.c is stored and
make the fallbacke implementation functoins non-static and create a
dbwrap_private.h header file that contains their prototypes.
My previous patches fixed up all direct TDB callers, but there are a
few utility functions and the db_context functions which are still
using the old -1 / 0 return codes.
It's clearer to fix up all the callers of these too, so everywhere is
consistent: non-zero means an error.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This will allow this structure to be shared, and allow us to create a
common messaging system between all Samba processes. Samba4 uses the
task_id to indicate the different tasks within a single unix process.
Andrew Bartlett
Signed-off-by: Andrew Tridgell <tridge@samba.org>
This #if _SAMBA_BUILD == 3 is very unfortunate, as it means that in
the top level build, these options are not available for these
databases. However, having two different tdb_wrap lists is a worse
fate, so this will do for now.
Andrew Bartlett
In the cluster case it can happen that a node just died and we did not yet have
the time to clean up serverid.tdb. If the corresponding serverid.tdb record
that represented a process was migrated away from the dead record, it
represents existence of a process where it is already dead.
TDB_CLEAR_IF_FIRST tdb's. For tdb's like gencache where we open
without CLEAR_IF_FIRST and then with CLEAR_IF_FIRST if corrupt
this is still safe to use as if opening an existing tdb the new
hash will be ignored - it's only used on creating a new tdb not
opening an old one.
Jeremy.
