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         | 15 +++++++++++++++
 libmultipath/config.h         |  1 +
 multipath/multipath.rules     |  1 +
 multipathd/multipathd.8       |  2 ++
 multipathd/multipathd.service |  1 +
 5 files changed, 20 insertions(+)

diff --git a/libmultipath/config.c b/libmultipath/config.c
index b4d87689..b36778b0 100644
--- a/libmultipath/config.c
+++ b/libmultipath/config.c
@@ -26,6 +26,7 @@
 #include "devmapper.h"
 #include "mpath_cmd.h"
 #include "propsel.h"
+#include "version.h"
 
 static int
 hwe_strmatch (const struct hwentry *hwe1, const struct hwentry *hwe2)
@@ -778,6 +779,20 @@ load_config (char * file)
 			goto out;
 		}
 		factorize_hwtable(conf->hwtable, builtin_hwtable_size, file);
+	} else {
+		condlog(0, "/etc/multipath.conf does not exist, blacklisting all devices.");
+		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 ceecff2d..3368d8c9 100644
--- a/libmultipath/config.h
+++ b/libmultipath/config.h
@@ -9,6 +9,7 @@
 
 #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 9df11a95..0486bf70 100644
--- a/multipath/multipath.rules
+++ b/multipath/multipath.rules
@@ -9,6 +9,7 @@ IMPORT{cmdline}="nompath"
 ENV{nompath}=="?*", GOTO="end_mpath"
 IMPORT{cmdline}="multipath"
 ENV{multipath}=="off", GOTO="end_mpath"
+TEST!="/etc/multipath.conf", GOTO="end_mpath"
 
 ENV{DEVTYPE}!="partition", GOTO="test_dev"
 IMPORT{parent}="DM_MULTIPATH_DEVICE_PATH"
diff --git a/multipathd/multipathd.8 b/multipathd/multipathd.8
index 048a838d..8bd47a80 100644
--- a/multipathd/multipathd.8
+++ b/multipathd/multipathd.8
@@ -39,6 +39,8 @@ map regains its maximum performance and redundancy.
 This daemon executes the external \fBmultipath\fR tool when events occur.
 In turn, the multipath tool signals the multipathd daemon when it is done with
 devmap reconfiguration, so that it can refresh its failed path list.
+
+In this Linux distribution, multipathd does not run unless a /etc/multipath.conf file exists.
 .
 .
 .\" ----------------------------------------------------------------------------
diff --git a/multipathd/multipathd.service b/multipathd/multipathd.service
index ba24983e..17434cef 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-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
-- 
2.17.2