device-mapper-multipath/0010-RH-add-find-multipaths.patch

---
 libmultipath/config.c    |    1 +
 libmultipath/config.h    |    1 +
 libmultipath/configure.c |   11 +++++++++++
 libmultipath/defaults.h  |    1 +
 libmultipath/dict.c      |   34 ++++++++++++++++++++++++++++++++++
 libmultipath/wwids.c     |   26 ++++++++++++++++++++++++++
 libmultipath/wwids.h     |    1 +
 multipath/main.c         |    2 +-
 multipathd/main.c        |    6 ++++++
 9 files changed, 82 insertions(+), 1 deletion(-)

Index: multipath-tools-120518/libmultipath/config.c
===================================================================
--- multipath-tools-120518.orig/libmultipath/config.c
+++ multipath-tools-120518/libmultipath/config.c
@@ -514,6 +514,7 @@ load_config (char * file)
 	conf->reassign_maps = DEFAULT_REASSIGN_MAPS;
 	conf->checkint = DEFAULT_CHECKINT;
 	conf->max_checkint = MAX_CHECKINT(conf->checkint);
+	conf->find_multipaths = DEFAULT_FIND_MULTIPATHS;
 
 	/*
 	 * preload default hwtable
Index: multipath-tools-120518/libmultipath/configure.c
===================================================================
--- multipath-tools-120518.orig/libmultipath/configure.c
+++ multipath-tools-120518/libmultipath/configure.c
@@ -497,6 +497,10 @@ coalesce_paths (struct vectors * vecs, v
 
 	memset(empty_buff, 0, WWID_SIZE);
 
+	/* ignore refwwid if it's empty */
+	if (refwwid && !strlen(refwwid))
+		refwwid = NULL;
+
 	if (force_reload) {
 		vector_foreach_slot (pathvec, pp1, k) {
 			pp1->mpp = NULL;
@@ -526,6 +530,13 @@ coalesce_paths (struct vectors * vecs, v
 		if (refwwid && strncmp(pp1->wwid, refwwid, WWID_SIZE))
 			continue;
 
+		/* If find_multipaths was selected check if the path is valid */
+		if (conf->find_multipaths && !refwwid &&
+		    !should_multipath(pp1, pathvec)) {
+			orphan_path(pp1);
+			continue;
+		}
+
 		/*
 		 * at this point, we know we really got a new mp
 		 */
Index: multipath-tools-120518/libmultipath/defaults.h
===================================================================
--- multipath-tools-120518.orig/libmultipath/defaults.h
+++ multipath-tools-120518/libmultipath/defaults.h
@@ -15,6 +15,7 @@
 #define DEFAULT_USER_FRIENDLY_NAMES    0
 #define DEFAULT_VERBOSITY	2
 #define DEFAULT_REASSIGN_MAPS	1
+#define DEFAULT_FIND_MULTIPATHS 0
 
 #define DEFAULT_CHECKINT	5
 #define MAX_CHECKINT(a)		(a << 2)
Index: multipath-tools-120518/libmultipath/dict.c
===================================================================
--- multipath-tools-120518.orig/libmultipath/dict.c
+++ multipath-tools-120518/libmultipath/dict.c
@@ -585,6 +585,27 @@ def_reservation_key_handler(vector strve
 }
 
 static int
+def_find_multipaths_handler(vector strvec)
+{
+	char * buff;
+
+	buff = set_value(strvec);
+
+	if (!buff)
+		return 1;
+
+	if ((strlen(buff) == 2 && !strcmp(buff, "no")) ||
+	    (strlen(buff) == 1 && !strcmp(buff, "0")))
+		conf->find_multipaths = 0;
+	else if ((strlen(buff) == 3 && !strcmp(buff, "yes")) ||
+		 (strlen(buff) == 1 && !strcmp(buff, "1")))
+		conf->find_multipaths = 1;
+
+	FREE(buff);
+	return 0;
+}
+
+static int
 def_names_handler(vector strvec)
 {
 	char * buff;
@@ -2549,6 +2570,18 @@ snprint_def_log_checker_err (char * buff
 }
 
 static int
+snprint_def_find_multipaths (char * buff, int len, void * data)
+{
+	if (conf->find_multipaths == DEFAULT_FIND_MULTIPATHS)
+		return 0;
+	if (!conf->find_multipaths)
+		return snprintf(buff, len, "no");
+
+	return snprintf(buff, len, "yes");
+}
+
+
+static int
 snprint_def_user_friendly_names (char * buff, int len, void * data)
 {
 	if (conf->user_friendly_names  == USER_FRIENDLY_NAMES_ON)
@@ -2646,6 +2679,7 @@ init_keywords(void)
 	install_keyword("bindings_file", &bindings_file_handler, &snprint_def_bindings_file);
 	install_keyword("log_checker_err", &def_log_checker_err_handler, &snprint_def_log_checker_err);
 	install_keyword("reservation_key", &def_reservation_key_handler, &snprint_def_reservation_key);
+	install_keyword("find_multipaths", &def_find_multipaths_handler, &snprint_def_find_multipaths);
 	__deprecated install_keyword("default_selector", &def_selector_handler, NULL);
 	__deprecated install_keyword("default_path_grouping_policy", &def_pgpolicy_handler, NULL);
 	__deprecated install_keyword("default_uid_attribute", &def_uid_attribute_handler, NULL);
Index: multipath-tools-120518/libmultipath/wwids.c
===================================================================
--- multipath-tools-120518.orig/libmultipath/wwids.c
+++ multipath-tools-120518/libmultipath/wwids.c
@@ -124,6 +124,32 @@ out:
 }
 
 int
+should_multipath(struct path *pp1, vector pathvec)
+{
+	int i;
+	struct path *pp2;
+
+	condlog(4, "checking if %s should be multipathed", pp1->dev);
+	vector_foreach_slot(pathvec, pp2, i) {
+		if (pp1->dev == pp2->dev)
+			continue;
+		if (strncmp(pp1->wwid, pp2->wwid, WWID_SIZE) == 0) {
+			condlog(3, "found multiple paths with wwid %s, "
+				"multipathing %s", pp1->wwid, pp1->dev);
+			return 1;
+		}
+	}
+	if (check_wwids_file(pp1->wwid, 0) < 0) {
+		condlog(3, "wwid %s not in wwids file, skipping %s",
+			pp1->wwid, pp1->dev);
+		return 0;
+	}
+	condlog(3, "found wwid %s in wwids file, multipathing %s", pp1->wwid,
+		pp1->dev);
+	return 1;
+}
+
+int
 remember_wwid(char *wwid)
 {
 	int ret = check_wwids_file(wwid, 1);
Index: multipath-tools-120518/libmultipath/wwids.h
===================================================================
--- multipath-tools-120518.orig/libmultipath/wwids.h
+++ multipath-tools-120518/libmultipath/wwids.h
@@ -12,6 +12,7 @@
 "#\n" \
 "# Valid WWIDs:\n"
 
+int should_multipath(struct path *pp, vector pathvec);
 int remember_wwid(char *wwid);
 int check_wwids_file(char *wwid, int write_wwid);
 
Index: multipath-tools-120518/multipath/main.c
===================================================================
--- multipath-tools-120518.orig/multipath/main.c
+++ multipath-tools-120518/multipath/main.c
@@ -332,7 +332,7 @@ configure (void)
 	/*
 	 * core logic entry point
 	 */
-	r = coalesce_paths(&vecs, NULL, NULL, conf->force_reload);
+	r = coalesce_paths(&vecs, NULL, refwwid, conf->force_reload);
 
 out:
 	if (refwwid)
Index: multipath-tools-120518/multipathd/main.c
===================================================================
--- multipath-tools-120518.orig/multipathd/main.c
+++ multipath-tools-120518/multipathd/main.c
@@ -49,6 +49,7 @@
 #include <print.h>
 #include <configure.h>
 #include <prio.h>
+#include <wwids.h>
 #include <pgpolicies.h>
 #include <uevent.h>
 
@@ -473,6 +474,11 @@ rescan:
 			return 1;
 		}
 
+		if (conf->find_multipaths &&
+		    !should_multipath(pp, vecs->pathvec)) {
+			orphan_path(pp);
+			return 0;
+		}
 		condlog(4,"%s: creating new map", pp->dev);
 		if ((mpp = add_map_with_path(vecs, pp, 1))) {
 			mpp->action = ACT_CREATE;
Index: multipath-tools-120518/libmultipath/config.h
===================================================================
--- multipath-tools-120518.orig/libmultipath/config.h
+++ multipath-tools-120518/libmultipath/config.h
@@ -104,6 +104,7 @@ struct config {
 	unsigned int dev_loss;
 	int log_checker_err;
 	int allow_queueing;
+	int find_multipaths;
 	uid_t uid;
 	gid_t gid;
 	mode_t mode;