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"basename" is define in libgen.h included from system/dir.h
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Allows blocking mode and start offset to be specified. Always locks a
1-byte range.
Make the lock structure static to avoid initialising the whole
structure each time.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
The ping timeout is specified by passing an extra argument to the
mutex helper, representing the ping timeout in seconds.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
In future this will allow extra I/O tests and a timeout in the parent
to (hopefully) release the lock if the child gets wedged. For
simplicity, use tmon only to detect when either parent or child goes
away. Plumbing a timeout for pings from child to parent will be done
later.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
There will be more timeouts so clarify the intent of this one.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
To avoid error messages having ridiculously long paths, set progname
to basename(argv[0]).
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
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>
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Swen Schillig <swen@linux.ibm.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Mon Aug 3 22:21:04 UTC 2020 on sn-devel-184
Testing against a commonly used cluster filesystem has shown no
performance impact, as expected.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
If the lock file is inaccessible or the inode number changes then the
lock is lost, so exit. This allows the recovery daemon to trigger an
election. The ensuing recovery will re-take the lock.
By default the lock file is checked every 60 seconds. A lot can
happen in 60 seconds but being more aggressive and accessing the lock
too often could result in a performance issue for the cluster
filesystem.
An new optional 2nd argument is added, which is the lock file re-check
time in seconds.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
This will allow more conditions to be waited on via additional
sub-requests. At the moment this just completes when the parent wait
completes.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Put the checking for the process being immediately re-parented into
the computation too. This will be very rare and doing it
consistently makes testing saner.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
There is no need to wait until the parent kills the helper. The
parent will get the initial response, indicating contention or
similar, and will then get a separate event indicating that the pipe
is gone.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
clang warns:
ctdb/server/ctdb_mutex_fcntl_helper.c:61:3: warning: Value stored to 'fd' is never read
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
This implements the type of fcntl locking that the recovery lock uses.
The intent is to use it for multiple locks and allow the choice of
helper to be configured.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
