References: bnc#821366
Git-commit: 030419821fb77f9955f2017b4a6d3d8139d6db25
From: NeilBrown <neilb@suse.de>
Date: Tue, 5 Feb 2013 15:57:09 +1100
Subject: [PATCH] mdmon: add --foreground option

While not strictly necessary for systemd, it is cleaner to avoid
forking when running from a management daemon.  So add a --foreground
option to mdmon.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 mdmon.8                |   10 +++++++++-
 mdmon.c                |    9 +++++++--
 systemd/mdmon@.service |    2 +-
 3 files changed, 17 insertions(+), 4 deletions(-)

--- mdadm-3.2.6.orig/mdmon.8
+++ mdadm-3.2.6/mdmon.8
@@ -5,7 +5,7 @@ mdmon \- monitor MD external metadata ar
 
 .SH SYNOPSIS
 
-.BI mdmon " [--all] [--takeover] [--offroot] CONTAINER"
+.BI mdmon " [--all] [--takeover] [--offroot] [--foreground] CONTAINER"
 
 .SH OVERVIEW
 The 2.6.27 kernel brings the ability to support external metadata arrays.
@@ -131,6 +131,14 @@ The
 device to monitor.  It can be a full path like /dev/md/container, or a
 simple md device name like md127.
 .TP
+.B \-\-foreground
+Normally,
+.I mdmon
+will fork and continue in the background.  Adding this option will
+skip that step and run
+.I mdmon
+in the foreground.
+.TP
 .B \-\-takeover
 This instructs
 .I mdmon
--- mdadm-3.2.6.orig/mdmon.c
+++ mdadm-3.2.6/mdmon.c
@@ -295,15 +295,17 @@ int main(int argc, char *argv[])
 	int opt;
 	int all = 0;
 	int takeover = 0;
+	int dofork = 1;
 	static struct option options[] = {
 		{"all", 0, NULL, 'a'},
 		{"takeover", 0, NULL, 't'},
 		{"help", 0, NULL, 'h'},
 		{"offroot", 0, NULL, OffRootOpt},
+		{"foreground", 0, NULL, 'F'},
 		{NULL, 0, NULL, 0}
 	};
 
-	while ((opt = getopt_long(argc, argv, "tha", options, NULL)) != -1) {
+	while ((opt = getopt_long(argc, argv, "thaF", options, NULL)) != -1) {
 		switch (opt) {
 		case 'a':
 			container_name = argv[optind-1];
@@ -312,6 +314,9 @@ int main(int argc, char *argv[])
 		case 't':
 			takeover = 1;
 			break;
+		case 'F':
+			dofork = 0;
+			break;
 		case OffRootOpt:
 			argv[0][0] = '@';
 			break;
@@ -383,7 +388,7 @@ int main(int argc, char *argv[])
 			container_name);
 		exit(1);
 	}
-	return mdmon(devname, devnum, do_fork(), takeover);
+	return mdmon(devname, devnum, dofork && do_fork(), takeover);
 }
 
 static int mdmon(char *devname, int devnum, int must_fork, int takeover)
--- mdadm-3.2.6.orig/systemd/mdmon@.service
+++ mdadm-3.2.6/systemd/mdmon@.service
@@ -11,7 +11,7 @@ DefaultDependencies=no
 Before=initrd-switch-root.target
 
 [Service]
-ExecStart=/sbin/mdmon %I
+ExecStart=/sbin/mdmon --foreground %I
 StandardInput=null
 StandardOutput=null
 StandardError=null