ctdb-mutex: Exit immediately if the lock isn't taken

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>

diff --git a/ctdb/server/ctdb_mutex_fcntl_helper.c b/ctdb/server/ctdb_mutex_fcntl_helper.c
index 166d9c2760ec00c393588469583eb4f8c7c001c0..44505047167e58c72b17dcbf5daefc4325cfed18 100644 (file)
--- a/ctdb/server/ctdb_mutex_fcntl_helper.c
+++ b/ctdb/server/ctdb_mutex_fcntl_helper.c
@@ -101,6 +101,10 @@ int main(int argc, char *argv[])
        result = fcntl_lock(file, &fd);
        sys_write(STDOUT_FILENO, &result, 1);
 
+       if (result != '0') {
+               return 0;
+       }
+
        ctdb_wait_for_process_to_exit(ppid);
 
        if (fd != -1) {