Initial support for mdadm RAID arrays

This patch adds initial support for handling MD RAID arrays.  Adding
a pass at the very end of the shutdown sequence to signal any external
RAID controller to clear its state before we proceed to halt/reboot.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

Makefile.am

@@ -1,8 +1,8 @@
 ACLOCAL_AMFLAGS    = -I m4
 sbin_PROGRAMS      = finit initctl reboot
-finit_SOURCES      = finit.c api.c client.c conf.c exec.c getty.c helpers.c \
-		     mount.c pid.c sig.c svc.c service.c plugin.c tty.c	    \
-		     cond.c cond-w.c sm.c utmp-api.c utmp-api.h
+finit_SOURCES      = finit.c api.c client.c cond.c cond-w.c conf.c exec.c \
+		     getty.c helpers.c mdadm.c mount.c pid.c plugin.c     \
+		     service.c sig.c svc.c sm.c tty.c utmp-api.c utmp-api.h
 pkginclude_HEADERS = cond.h finit.h helpers.h inetd.h plugin.h svc.h
 if INETD
 finit_SOURCES     += inetd.c

helpers.h

@@ -28,6 +28,7 @@
 #include <stdio.h>
 #include <string.h>		/* strerror() */
 #include <syslog.h>
+#include <sys/types.h>
 
 #define DO_LOG(level, fmt, args...)				\
 do {								\

mdadm.c

@@ -0,0 +1,72 @@
+/* Handle MD arrays
+ *
+ * Copyright (c) 2016  Joachim Nilsson <troglobit@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <glob.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "helpers.h"
+
+
+static glob_t *get_arrays(void)
+{
+	static glob_t arrays;
+
+	glob("/sys/block/md*", 0, NULL, &arrays);
+	if (arrays.gl_pathc > 0)
+		return &arrays;
+
+	return NULL;
+}
+
+/*
+ * If system has an MD raid, we must tell it to stop before continuing
+ * with the shutdown.  Some controller cards, in particular the Intel(R)
+ * Matrix Storage Manager, must be properly notified.
+ */
+void mdadm_wait(void)
+{
+	size_t i;
+	glob_t *gl;
+	char cmd[160];
+
+	/* Setup kernel specific settings, e.g. allow broadcast ping, etc. */
+	gl = get_arrays();
+	if (gl) {
+		for (i = 0; i < gl->gl_pathc; i++) {
+			char *array;
+
+			array = basename(gl->gl_pathv[i]);
+			snprintf(cmd, sizeof(cmd), "mdadm --wait-clean /dev/%s >/dev/null", array);
+			run_interactive(cmd, "Marking MD array %s as clean", array);
+		}
+		globfree(gl);
+	}
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */

sig.c

@@ -86,6 +86,7 @@ static uev_t sighup_watcher,  sigint_watcher,  sigpwr_watcher;
 static uev_t sigchld_watcher, sigsegv_watcher;
 static uev_t sigstop_watcher, sigtstp_watcher, sigcont_watcher;
 
+void mdadm_wait(void);
 void unmount_tmpfs(void);
 void unmount_regular(void);
 
@@ -155,7 +156,8 @@ void do_shutdown(shutop_t op)
 	run("/bin/mount -n -o remount,ro dummydev /");
 	run("/bin/mount -n -o remount,ro /");
 
-	/* XXX: Call mdadm to mark RAID array(s) as clean before halting. */
+	/* Call mdadm to mark any RAID array(s) as clean before halting. */
+	mdadm_wait();
 
 	_d("%s.", op == SHUT_REBOOT ? "Rebooting" : "Halting");
 	if (op == SHUT_REBOOT)