device-mapper-multipath/0005-RH-don-t-start-without-a-config-file.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Benjamin Marzinski <bmarzins@redhat.com>
Date: Wed, 15 Oct 2014 10:39:30 -0500
Subject: [PATCH] RH: don't start without a config file

If /etc/multipath.conf doesn't exist, don't start multipathd and blacklist
all devices when running multipath.  A completely blank configuration file
is almost never what users want.  Also, people may have the multipath
packages installed but don't want to use them.  This patch provides a
simple way to disable multipath.  Simply removing or renaming
/etc/multipath.conf will keep multipath from doing anything.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
 libmultipath/config.c         | 17 +++++++++++++++++
 libmultipath/config.h         |  1 +
 multipath/multipath.rules     |  1 +
 multipathd/multipathd.service |  1 +
 4 files changed, 20 insertions(+)

diff --git a/libmultipath/config.c b/libmultipath/config.c
index bb6619b..aae69b8 100644
--- a/libmultipath/config.c
+++ b/libmultipath/config.c
@@ -25,6 +25,7 @@
 #include "prio.h"
 #include "devmapper.h"
 #include "mpath_cmd.h"
+#include "version.h"
 
 static int
 hwe_strmatch (struct hwentry *hwe1, struct hwentry *hwe2)
@@ -667,6 +668,22 @@ load_config (char * file)
 			factorize_hwtable(conf->hwtable, builtin_hwtable_size);
 		}
 
+	} else {
+		condlog(0, "/etc/multipath.conf does not exist, blacklisting all devices.");
+		condlog(0, "A default multipath.conf file is located at");
+		condlog(0, "/usr/share/doc/device-mapper-multipath-%d.%d.%d/multipath.conf", MULTIPATH_VERSION(VERSION_CODE));
+		if (conf->blist_devnode == NULL) {
+			conf->blist_devnode = vector_alloc();
+			if (!conf->blist_devnode) {
+				condlog(0, "cannot allocate blacklist\n");
+				goto out;
+			}
+		}
+		if (store_ble(conf->blist_devnode, strdup(".*"),
+		              ORIGIN_NO_CONFIG)) {
+			condlog(0, "cannot store default no-config blacklist\n");
+			goto out;
+		}
 	}
 
 	conf->processed_main_config = 1;
diff --git a/libmultipath/config.h b/libmultipath/config.h
index ffc69b5..614331c 100644
--- a/libmultipath/config.h
+++ b/libmultipath/config.h
@@ -7,6 +7,7 @@
 
 #define ORIGIN_DEFAULT 0
 #define ORIGIN_CONFIG  1
+#define ORIGIN_NO_CONFIG 2
 
 /*
  * In kernel, fast_io_fail == 0 means immediate failure on rport delete.
diff --git a/multipath/multipath.rules b/multipath/multipath.rules
index 4d78b98..5753766 100644
--- a/multipath/multipath.rules
+++ b/multipath/multipath.rules
@@ -6,6 +6,7 @@ IMPORT{cmdline}="nompath"
 ENV{nompath}=="?*", GOTO="end_mpath"
 IMPORT{cmdline}="multipath"
 ENV{multipath}=="off", GOTO="end_mpath"
+TEST!="/etc/multipath.conf", GOTO="end_mpath"
 
 KERNEL=="dm-*", GOTO="check_kpartx"
 ENV{DEVTYPE}!="partition", GOTO="test_dev"
diff --git a/multipathd/multipathd.service b/multipathd/multipathd.service
index fd66cf6..fafd088 100644
--- a/multipathd/multipathd.service
+++ b/multipathd/multipathd.service
@@ -4,6 +4,7 @@ Wants=systemd-udev-trigger.service systemd-udev-settle.service
 Before=iscsi.service iscsid.service lvm2-lvmetad.service lvm2-activation-early.service
 Before=local-fs-pre.target blk-availability.service
 After=multipathd.socket systemd-udev-trigger.service systemd-udev-settle.service
+ConditionPathExists=/etc/multipath.conf
 DefaultDependencies=no
 Conflicts=shutdown.target
 ConditionKernelCommandLine=!nompath
-- 
2.7.4