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* allow tdb_traverse_read before tdb_transaction[_prepare]_commit()
* Improve documentation for tdb_transaction_start()
* Add new function tdb_transaction_active()
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This will allow callers to avoid their own reference counting of transactions.
Additionally, this will always line up with the acutal transaction state, even
in the error cases where tdb can cancel the transaction
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
It now references the TDB_ALLOW_NESTING and TDB_DISALLOW_NESTING flags
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This restores the original intent of tdb_traverse_read() in
7dd31288a701d772e45b1960ac4ce4cc1be782ed
This is needed to avoid a deadlock with tdb_lockall() and the
transaction start, as ldb_tdb should take the allrecord lock during a
search (which calls tdb_traverse), and can otherwise deadlock against
a transaction starting in another process
We add a test to show that a transaction can now start while a read
traverse is in progress
This allows more operations to happen in parallel. The blocking point
is moved to the prepare commit.
This in turn permits a roughly doubling of unindexed search
performance, because currently ldb_tdb omits to take the lock due to
an unrelated bug, but taking the allrecord lock triggers the
above-mentioned deadlock.
This behaviour was added in 251aaafe3a9213118ac3a92def9ab2104c40d12a for
Solaris 10 in 2005. But the run-fcntl-deadlock test works also on Solaris 10,
see https://lists.samba.org/archive/samba-technical/2017-April/119876.html.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This verifies the F_RDLCK => F_WRLCK upgrade logic in the kernel
for conflicting locks.
This is a standalone test to check the traverse_read vs.
allrecord_lock/prepare_commit interaction.
This is based on the example from
https://lists.samba.org/archive/samba-technical/2017-April/119861.html
from Douglas Bagnall <douglas.bagnall@catalyst.net.nz> and Volker Lendecke <vl@samba.org>.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The current runtime check for robust mutexes in
tdb_runtime_check_for_robust_mutexes() is not thread-safe.
When called in a multi-threaded program where any another thread doesn't
have SIGCHLD blocked, we may end up hung in sigsuspend() waiting for a
SIGCHLD of a child procecss and the signal was delivered to another
thread.
Revert to the previous behaviour of waiting for the child instead of
waiting for the SIGCHLD signal.
Ensure the pid we wait for is not reset to -1 in a toctou race with the
signal handler.
Check whether waitpid() returns ECHILD which can happen if the signal
handler is run by more then one thread in parallel (yes, this can
happen) or if tdb_robust_mutex_wait_for_child() and the signal handler
are racing.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=12593
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: Andreas Schneider <asn@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Apr 22 09:16:16 CEST 2017 on sn-devel-144
When a process holds a readlock and wants to upgrade, this needs to be
reflected in the underlying lock. Without this, it is possible to cheat:
One process holds a readlock, and another process wants to write this
record. All the writer has to do is take a readonly lock on the key and
then do the store.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Drop the configure option for --disable-python as it is now
global in wafsamba.
If samba is set to use a system copy of tdb, and tdb wasn't built
with python support, then the system pytevent will not be found. If
samba is being built without python support then pytdb is not needed,
so do not bother to try and find it.
Signed-off-by: Ian Stakenvicius <axs@gentoo.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
* Bug 12455 - tdb mutexes don't work on FreeBSD
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Wed Nov 30 20:02:28 CET 2016 on sn-devel-144
susv4 on mmap has the following snippet:
> The state of synchronization objects such as mutexes, semaphores,
> barriers, and conditional variables placed in shared memory mapped
> with MAP_SHARED becomes undefined when the last region in any process
> containing the synchronization object is unmapped.
This means we can't keep the mutex mmap area unmapped at any point
in time.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12455
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): Tue Nov 29 23:59:52 CET 2016 on sn-devel-144
This gains a few percent in tdbbackup
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Fri Jul 15 00:52:00 CEST 2016 on sn-devel-144
Signed-off-by: Bob Campbell <bobcampbell@catalyst.net.nz>
Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Pair-programmed-with: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sun Jul 3 18:11:30 CEST 2016 on sn-devel-144
This comes via a "goto cleanup" before suspend_mask is initialized
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Autobuild-User(master): Uri Simchoni <uri@samba.org>
Autobuild-Date(master): Tue Apr 12 11:39:35 CEST 2016 on sn-devel-144
* avoid a race condition when checking for robust mutexes
(bug #11808)
* Remove use of strcpy in tdb test.
* eliminate deprecation warnings in python tests
* Only set public headers field when installing as a public library.
* Refuse to load a database with hash size 0
* Fix various spelling errors
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Mon Apr 11 18:48:26 CEST 2016 on sn-devel-144
The cleanup logic used six goto lables, at least I'm not able to make
sane modifications to such a beast.
By using state flags that track which objects are initialized and need
cleanup, we get rid of the goto labels. It comes at a cost though: you
have to be careful to correctly set the cleanup flags.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
This fixes a race between calling waitpid() in two places (SIGCHLD the
signal handler and the rendezvous code when waiting for the child to
terminate), by
- blocking SIGCHLD before installing our signal handler
- in the rendezvous code call sigssuspend() which unblocks SIGCHLD and
suspends the thread and waits for signal delivery
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11808
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue Mar 29 16:04:19 CEST 2016 on sn-devel-144
assertEquals() is superseded by assertEqual()
Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Tue Feb 16 19:58:39 CET 2016 on sn-devel-144
This just ensures we reject (rather than div-by-0) a corrupt
DB with a zero hash size.
Found with american fuzzy lop
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Dec 18 08:26:25 CET 2015 on sn-devel-144
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Fri Nov 6 13:43:45 CET 2015 on sn-devel-104
This reverts commit ea53e86c256bec08373dbe86e190a7f5a06eff9d.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Fri Sep 18 14:03:12 CEST 2015 on sn-devel-104
The reverse of tdbdump
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): Fri Sep 18 03:04:35 CEST 2015 on sn-devel-104
With --disable-python, we should not install any python files.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Thu Jul 23 18:50:25 CEST 2015 on sn-devel-104
