zdtm: lock can belong to child or parent

Locks created by flock() are associated with an open file description
This means that duplicate file descriptors (created by, for  example,
fork or  dup)  refer  to  the  same  lock.

Reported-by: Mr Jenkins
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/file_locks02.c

@@ -16,7 +16,7 @@ const char *test_author	= "Pavel Emelyanov <xemul@parallels.com>";
 char *filename;
 TEST_OPTION(filename, string, "file name", 1);
 
-static int check_file_locks()
+static int check_file_locks(pid_t child)
 {
 	FILE		*fp_locks = NULL;
 	char		buf[100], fl_flag[16], fl_type[16], fl_option[16];
@@ -44,7 +44,7 @@ static int check_file_locks()
 			break;
 		}
 
-		if (fl_owner != pid)
+		if (fl_owner != pid && fl_owner != child)
 			continue;
 
 		if (!strcmp(fl_flag, "FLOCK") &&
@@ -90,7 +90,7 @@ int main(int argc, char **argv)
 	test_daemon();
 	test_waitsig();
 
-	if (check_file_locks())
+	if (check_file_locks(pid))
 		pass();
 	else
 		fail("Flock file locks check failed");