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The initial idea was to have some "atomicity" in this API. Every
caller interested in a record would have to do something with
it once it changes. However, only one caller really used this
feature, and that is easily changed to not use it. So
remove the complexity.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
With messages_ctdb, the global ctdb connection will change after fork.
Don't store the wrong parent connection across a fork. The alternative would
be to do a reinit on all dbwrap_ctdb databases, but that seems overkill
given that we only have one "standard" ctdb connection anyway.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
The idea is to leave the "watchers" array unparsed until it's needed. This
avoids a few talloc calls and unnecessary parsing.
Also, it deletes quite a few lines of code and .text bytes.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Convert all implementors of dbwrap_store to a storev-style call
by using the dbwrap_merge_dbufs call
For dbwrap_tdb, this matches tdb_storev.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
ctdbd_db_attach() only needs to know the ctdb database model, not the
rest of the flags.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=12891
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
ctdb_private is much broader. Right now we implement the protocol
ourselves. In the future, we might switch to the native ctdb
client implementation defined in ctdb_client.h, but that's a
different project :-)
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Jun 24 05:33:41 CEST 2017 on sn-devel-144
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed May 10 03:25:40 CEST 2017 on sn-devel-144
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Sun May 7 16:40:19 CEST 2017 on sn-devel-144
After initializing the async connection to ctdb we must set initialized
to true.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
If locking.tdb contains invalid records, "get_file_infos" called from directory
enumeration crashes in Samba 4.4. The reason is that if "dbwrap_watched_parse"
returns -1 due to record corruption, dbwrap_watched_parse_record returns
NT_STATUS_OK without having called the parse function. Before 66cba9939b
this led to "lck->data" to be uninitialized data, so smbd 4.4 would crash in
this case. After 66cba9939b we implicitly initialize "state.lck" to NULL,
so we don't have this particular problem anymore
Apply the fix in master too, returning NT_STATUS_OK from parse_record without
having called the parser could lead to bugs in other cases too.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This mainly works like the sync version, but calls ctdbd_parse_send/recv
instead.
We use one global ctdb connection that is used exclusively for async
requests.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Pair-programmed-with: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
When fetching records from remote ctdb nodes via ctdbd_parse() or in
db_ctdb_traverse(), we already check for tombstone records and skip
them. This was originally also done for the ltdb checks.
See also bug: https://bugzilla.samba.org/show_bug.cgi?id=10008
(commit 1cae59ce11).
Commit 925625b528 reverted part of the
patch of bug 10008 due to a deadlock it introduced.
This patch re-introduces the consistent treatment of empty records in
the ltdb but avoids the deadlock by correctly signalling
NT_STATUS_NOT_FOUND if an empty record is found authoritatively in
the ltdb and not calling ctdb in this case.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12005
Pair-Programmed-With: Michael Adam <obnox@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Tue Aug 9 04:38:44 CEST 2016 on sn-devel-144
The existing one with a separate dbwrap_watchers.tdb turns out to
create a performance penalty in a clustered environment. Non-clustered,
dbwrap_parse_record on non-existent records is very cheap, but in a
cluster environment this is very noticable.
This implementation puts the watcher information into the records itself. For
large records, this might be another performance penalty, because we have to
assemble the final record together with talloc and memcpy, but this might be
fixed later with a tdb_storev call.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
It's highly unlinkely that this will ever kick in, because our current tdb keys
are rather small, but offset calculations without overflow checks are bad.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Typicall, when we watch a record, we wait for a process to give up some
resource. Be it an oplock, a share mode or the g_lock. If everything goes well,
the blocker sends us a message. If the blocker dies hard, we want to also be
informed immediately.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue May 17 16:54:36 CEST 2016 on sn-devel-144
Another step towards making ctdbd_conn.c independent of messages.c. No call to
ctdb_conn_msg_ctx() anymore
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This removes one circular dependency of dbwrap_ctdb to messages.c: No call to
messaging_ctdbd_connection() anymore from dbwrap_ctdb.c.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This minimizes the use of messaging_ctdbd_connection() to
db_open_ctx(). Next step will move this into db_open().
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This converts the "cstatus" parameter of ctdbd_control_local to what it is
defined as in the packet: int32_t. It was used inconsistently throughout the
code.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Mon Apr 25 21:54:24 CEST 2016 on sn-devel-144
2 effects: This removes the [un]become_root calls from ctdbd_conn,
and it makes it possible to re-use the traversal connections, should
the setup/teardown become a problem in the future.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This is similar to dbwrap_tdb_mutexes:*= (which is autodetected by default),
but dbwrap_tdb_require_mutexes is off by default.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This was part of libctdb which has been removed.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Michael Adam <obnox@samba.org>
Reviewed-by: Martin Schwenke <martin@meltin.net>
