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If there is an error then this pointer is unconditionally
dereferenced.
However, the only possible error appears to be ENOMEM, where a crash
caused by dereferencing a NULL pointer isn't a terrible outcome. In
the absence of a security issue this is probably not worth
backporting.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12469
The code to lock multiple databases has been dropped from ctdb_lock.c.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
This avoids the extra argument of logfd to ctdb_lock_helper. The log
messages from lock helper are captured by ctdbd.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12392
Earlier we were relying on SCHED_RESET_ON_FORK to reset the priority of lock
helper processes. Since SCHED_RESET_ON_FORK support has been removed, the
scheduling priority of child processes created using vfork() need to be reset
explicitly in the helper processes.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Fri Nov 18 10:18:27 CET 2016 on sn-devel-144
Use real-time priority only for obtaining record and database locks.
Do not open databases with real-time priority as it can cause thundering
herd on fcntl lock while opening tdb database. Also relinquish real-time
priority after the lock is obtained.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Mon Mar 7 11:29:00 CET 2016 on sn-devel-144
Instead of includes.h, include the required header files explicitly.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
This groups function prototypes for system specific functions in
common/system.h and removes them from ctdb_private.h.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Otherwise errors printed by the lock helper get lost.
lock_helper_args() no longer adds the program name to the list of
arguments, since vfork_with_logging() does that. Update the lock
helper to handle the extra log_fd parameter passed by
vfork_with_logging() and send stdout/stderr there.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
To avoid lock helper starvation when userspace robust mutexes are
enabled.
Commit 6f072f85a1 removed reset_scheduler(),
to avoid resetting scheduler priority. However, that is not sufficient
because of commit 1be8564e55, which sets
SCHED_RESET_ON_FORK flag. With SCHED_RESET_ON_FORK, all CTDB child
processes will automatically have normal scheduling priority.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Thu Sep 11 11:31:10 CEST 2014 on sn-devel-104
This is the only place it is used.
After migrating to Samba's lib/util, the lock helper can be changed to
use strhex_to_data_blob().
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
When using TDB robust mutexes, the kernel wakes waiting processes one
by one, in the priority list order. To ensure that ctdb lock helper
processes do not starve, lock helper processes need to run at a higher
priority than smbd.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Do not run helper processes with real-time priority.
This regression was caused when locking and eventscript code switched
to use vfork() and helper instead of ctdb_fork().
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Thu Jun 12 08:10:36 CEST 2014 on sn-devel-104
