mdadm/mdadm-3.2.6-cgroup.patch

diff -up mdadm-3.2.6/util.c.cgroup mdadm-3.2.6/util.c
--- mdadm-3.2.6/mdmon.c.cgroup	2012-11-15 16:48:03.327035349 -0500
+++ mdadm-3.2.6/mdmon.c	2012-11-15 17:07:16.628751041 -0500
@@ -386,6 +386,25 @@
 	return mdmon(devname, devnum, do_fork(), takeover);
 }
 
+int set_cgroup(char *group)
+{
+	char pid[8];
+	char pathbuf[PATH_MAX];
+	int tasks_fd, n;
+
+	snprintf(pathbuf, PATH_MAX, "/sys/fs/cgroup/%s/tasks", group);
+	tasks_fd = open(pathbuf, O_WRONLY);
+	if (tasks_fd >= 0) {
+		snprintf(pid, sizeof(pid), "%d", getpid());
+		n = write(tasks_fd, pid, strlen(pid));
+		close(tasks_fd);
+		if (n != (int)strlen(pid)) {
+			return -1;
+		}
+	}
+	return 0;
+}
+
 static int mdmon(char *devname, int devnum, int must_fork, int takeover)
 {
 	int mdfd;
@@ -438,6 +457,8 @@
 	} else
 		pfd[0] = pfd[1] = -1;
 
+	set_cgroup("systemd");
+
 	container = calloc(1, sizeof(*container));
 	container->devnum = devnum;
 	container->devname = devname;