---
 libmultipath/finder.c     |    2 +-
 libmultipath/finder.h     |    1 +
 multipath/main.c          |   35 ++++++++++++++++++++++++++++-------
 multipath/multipath.rules |    8 ++++++++
 4 files changed, 38 insertions(+), 8 deletions(-)

Index: multipath-tools/libmultipath/finder.c
===================================================================
--- multipath-tools.orig/libmultipath/finder.c
+++ multipath-tools/libmultipath/finder.c
@@ -78,7 +78,7 @@ write_out_wwid(int fd, char *wwid) {
 	return 1;
 }
 
-static int
+int
 check_wwids_file(char *wwid, int write_wwid)
 {
 	int scan_fd, fd, can_write, found, ret;
Index: multipath-tools/libmultipath/finder.h
===================================================================
--- multipath-tools.orig/libmultipath/finder.h
+++ multipath-tools/libmultipath/finder.h
@@ -14,5 +14,6 @@
 
 int should_multipath(struct path *pp, vector pathvec);
 int remember_wwid(char *wwid);
+int check_wwids_file(char *wwid, int write_wwid);
 
 #endif /* _FINDER_H */
Index: multipath-tools/multipath/main.c
===================================================================
--- multipath-tools.orig/multipath/main.c
+++ multipath-tools/multipath/main.c
@@ -51,6 +51,7 @@
 #include <errno.h>
 #include <sys/time.h>
 #include <sys/resource.h>
+#include <finder.h>
 
 int logsink;
 
@@ -79,7 +80,7 @@ usage (char * progname)
 {
 	fprintf (stderr, VERSION_STRING);
 	fprintf (stderr, "Usage:\n");
-	fprintf (stderr, "  %s [-d] [-r] [-v lvl] [-p pol] [-b fil] [dev]\n", progname);
+	fprintf (stderr, "  %s [-c] [-d] [-r] [-v lvl] [-p pol] [-b fil] [dev]\n", progname);
 	fprintf (stderr, "  %s -l|-ll|-f [-v lvl] [-b fil] [dev]\n", progname);
 	fprintf (stderr, "  %s -F [-v lvl]\n", progname);
 	fprintf (stderr, "  %s -h\n", progname);
@@ -91,6 +92,7 @@ usage (char * progname)
 		"  -ll     show multipath topology (maximum info)\n" \
 		"  -f      flush a multipath device map\n" \
 		"  -F      flush all multipath device maps\n" \
+		"  -c      check if a device should be a path in a multipath device\n" \
 		"  -d      dry run, do not create or update devmaps\n" \
 		"  -r      force devmap reload\n" \
 		"  -p      policy failover|multibus|group_by_serial|group_by_prio\n" \
@@ -249,10 +251,11 @@ configure (void)
 	/*
 	 * if we have a blacklisted device parameter, exit early
 	 */
-	if (dev && 
-	    (filter_devnode(conf->blist_devnode, conf->elist_devnode, dev) > 0))
-			goto out;
-	
+	if (dev && (filter_devnode(conf->blist_devnode, conf->elist_devnode, dev) > 0)) {
+		if (conf->dry_run == 2)
+			printf("%s is not a valid multipath device path\n", conf->dev);
+		goto out;
+	}
 	/*
 	 * scope limiting must be translated into a wwid
 	 * failing the translation is fatal (by policy)
@@ -268,6 +271,15 @@ configure (void)
 		if (filter_wwid(conf->blist_wwid, conf->elist_wwid,
 				refwwid) > 0)
 			goto out;
+		if (conf->dry_run == 2) {
+			if (check_wwids_file(refwwid, 0) == 0){
+				printf("%s is a valid multipath device path\n", conf->dev);
+				r = 0;
+			}
+			else
+				printf("%s is not a valid multipath device path\n", conf->dev);
+			goto out;
+		}
 	}
 
 	/*
@@ -350,7 +362,7 @@ main (int argc, char *argv[])
 		condlog(0, "multipath tools need sysfs mounted");
 		exit(1);
 	}
-	while ((arg = getopt(argc, argv, ":dhl::FfM:v:p:b:r")) != EOF ) {
+	while ((arg = getopt(argc, argv, ":dchl::FfM:v:p:b:r")) != EOF ) {
 		switch(arg) {
 		case 1: printf("optarg : %s\n",optarg);
 			break;
@@ -364,8 +376,12 @@ main (int argc, char *argv[])
 		case 'b':
 			conf->bindings_file = optarg;
 			break;
+		case 'c':
+			conf->dry_run = 2;
+			break;
 		case 'd':
-			conf->dry_run = 1;
+			if (!conf->dry_run)
+				conf->dry_run = 1;
 			break;
 		case 'f':
 			conf->remove = FLUSH_ONE;
@@ -438,6 +454,11 @@ main (int argc, char *argv[])
 
 	dm_init();
 
+	if (conf->dry_run == 2 &&
+	    (!conf->dev || conf->dev_type == DEV_DEVMAP)) {
+		condlog(0, "the -c option requires a path to check");
+		goto out;
+	}
 	if (conf->remove == FLUSH_ONE) {
 		if (conf->dev_type == DEV_DEVMAP)
 			r = dm_flush_map(conf->dev);
Index: multipath-tools/multipath/multipath.rules
===================================================================
--- multipath-tools.orig/multipath/multipath.rules
+++ multipath-tools/multipath/multipath.rules
@@ -1,6 +1,14 @@
 # multipath wants the devmaps presented as meaninglful device names
 # so name them after their devmap name
 SUBSYSTEM!="block", GOTO="end_mpath"
+TEST!="/sbin/multipath", GOTO="check_usr"
+ENV{MPATH_GOT_HERE}="$env{DEVNAME}"
+PROGRAM=="/sbin/multipath -c /dev/$env{DEVNAME}", ENV{DM_MULTIPATH_DEVICE_PATH}="1"
+GOTO="skip_usr"
+LABEL="check_usr"
+ENV{MPATH_GOT_HERE} = "2"
+PROGRAM=="/usr/sbin/multipath -c /dev/$env{DEVNAME}", ENV{DM_MULTIPATH_DEVICE_PATH}="1"
+LABEL="skip_usr"
 RUN+="socket:/org/kernel/dm/multipath_event"
 KERNEL!="dm-*", GOTO="end_mpath"
 ACTION!="change", GOTO="end_mpath"