device-mapper-multipath/0021-RHBZ-548874-add-find-multipaths.patch

---
 libmultipath/Makefile    |    2 
 libmultipath/alias.c     |  152 ------------------------------
 libmultipath/alias.h     |    1 
 libmultipath/config.c    |    1 
 libmultipath/config.h    |    1 
 libmultipath/configure.c |   23 ++++
 libmultipath/defaults.h  |    2 
 libmultipath/dict.c      |   34 ++++++
 libmultipath/file.c      |  178 ++++++++++++++++++++++++++++++++++++
 libmultipath/file.h      |   11 ++
 libmultipath/finder.c    |  150 ++++++++++++++++++++++++++++++
 libmultipath/finder.h    |   18 +++
 multipath/Makefile       |    2 
 multipath/main.c         |    2 
 multipath/mpathconf      |  232 +++++++++++++++++++++++++++++++++++++++++++++++
 multipathd/main.c        |   27 +++--
 16 files changed, 674 insertions(+), 162 deletions(-)

Index: multipath-tools/libmultipath/alias.c
===================================================================
--- multipath-tools.orig/libmultipath/alias.c
+++ multipath-tools/libmultipath/alias.c
@@ -3,19 +3,16 @@
  * Copyright (c) 2005 Benjamin Marzinski, Redhat
  */
 #include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
 #include <errno.h>
 #include <unistd.h>
 #include <string.h>
 #include <limits.h>
 #include <stdio.h>
-#include <signal.h>
 
 #include "debug.h"
 #include "uxsock.h"
 #include "alias.h"
+#include "file.h"
 
 
 /*
@@ -37,149 +34,6 @@
  */
 
 static int
-ensure_directories_exist(char *str, mode_t dir_mode)
-{
-	char *pathname;
-	char *end;
-	int err;
-
-	pathname = strdup(str);
-	if (!pathname){
-		condlog(0, "Cannot copy bindings file pathname : %s",
-			strerror(errno));
-		return -1;
-	}
-	end = pathname;
-	/* skip leading slashes */
-	while (end && *end && (*end == '/'))
-		end++;
-
-	while ((end = strchr(end, '/'))) {
-		/* if there is another slash, make the dir. */
-		*end = '\0';
-		err = mkdir(pathname, dir_mode);
-		if (err && errno != EEXIST) {
-			condlog(0, "Cannot make directory [%s] : %s",
-				pathname, strerror(errno));
-			free(pathname);
-			return -1;
-		}
-		if (!err)
-			condlog(3, "Created dir [%s]", pathname);
-		*end = '/';
-		end++;
-	}
-	free(pathname);
-	return 0;
-}
-
-static void
-sigalrm(int sig)
-{
-	/* do nothing */
-}
-
-static int
-lock_bindings_file(int fd)
-{
-	struct sigaction act, oldact;
-	sigset_t set, oldset;
-	struct flock lock;
-	int err;
-
-	memset(&lock, 0, sizeof(lock));
-	lock.l_type = F_WRLCK;
-	lock.l_whence = SEEK_SET;
-
-	act.sa_handler = sigalrm;
-	sigemptyset(&act.sa_mask);
-	act.sa_flags = 0;
-	sigemptyset(&set);
-	sigaddset(&set, SIGALRM);
-
-	sigaction(SIGALRM, &act, &oldact);
-	sigprocmask(SIG_UNBLOCK, &set, &oldset);
-
-	alarm(BINDINGS_FILE_TIMEOUT);
-	err = fcntl(fd, F_SETLKW, &lock);
-	alarm(0);
-
-	if (err) {
-		if (errno != EINTR)
-			condlog(0, "Cannot lock bindings file : %s",
-					strerror(errno));
-		else
-			condlog(0, "Bindings file is locked. Giving up.");
-	}
-
-	sigprocmask(SIG_SETMASK, &oldset, NULL);
-	sigaction(SIGALRM, &oldact, NULL);
-	return err;
-
-}
-
-
-static int
-open_bindings_file(char *file, int *can_write)
-{
-	int fd;
-	struct stat s;
-
-	if (ensure_directories_exist(file, 0700))
-		return -1;
-	*can_write = 1;
-	fd = open(file, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
-	if (fd < 0) {
-		if (errno == EROFS) {
-			*can_write = 0;
-			condlog(3, "Cannot open bindings file [%s] read/write. "
-				" trying readonly", file);
-			fd = open(file, O_RDONLY);
-			if (fd < 0) {
-				condlog(0, "Cannot open bindings file [%s] "
-					"readonly : %s", file, strerror(errno));
-				return -1;
-			}
-		}
-		else {
-			condlog(0, "Cannot open bindings file [%s] : %s", file,
-				strerror(errno));
-			return -1;
-		}
-	}
-	if (*can_write && lock_bindings_file(fd) < 0)
-		goto fail;
-
-	memset(&s, 0, sizeof(s));
-	if (fstat(fd, &s) < 0){
-		condlog(0, "Cannot stat bindings file : %s", strerror(errno));
-		goto fail;
-	}
-	if (s.st_size == 0) {
-		if (*can_write == 0)
-			goto fail;
-		/* If bindings file is empty, write the header */
-		size_t len = strlen(BINDINGS_FILE_HEADER);
-		if (write_all(fd, BINDINGS_FILE_HEADER, len) != len) {
-			condlog(0,
-				"Cannot write header to bindings file : %s",
-				strerror(errno));
-			/* cleanup partially written header */
-			ftruncate(fd, 0);
-			goto fail;
-		}
-		fsync(fd);
-		condlog(3, "Initialized new bindings file [%s]", file);
-	}
-
-	return fd;
-
-fail:
-	close(fd);
-	return -1;
-}
-
-static int
 format_devname(char *name, int id, int len)
 {
 	int pos;
@@ -364,7 +218,7 @@ get_user_friendly_alias(char *wwid, char
 		return NULL;
 	}
 
-	fd = open_bindings_file(file, &can_write);
+	fd = open_file(file, &can_write, BINDINGS_FILE_HEADER);
 	if (fd < 0)
 		return NULL;
 
@@ -414,7 +268,7 @@ get_user_friendly_wwid(char *alias, char
 		return NULL;
 	}
 
-	fd = open_bindings_file(file, &unused);
+	fd = open_file(file, &unused, BINDINGS_FILE_HEADER);
 	if (fd < 0)
 		return NULL;
 
Index: multipath-tools/libmultipath/alias.h
===================================================================
--- multipath-tools.orig/libmultipath/alias.h
+++ multipath-tools/libmultipath/alias.h
@@ -1,4 +1,3 @@
-#define BINDINGS_FILE_TIMEOUT 30
 #define BINDINGS_FILE_HEADER \
 "# Multipath bindings, Version : 1.0\n" \
 "# NOTE: this file is automatically maintained by the multipath program.\n" \
Index: multipath-tools/libmultipath/config.c
===================================================================
--- multipath-tools.orig/libmultipath/config.c
+++ multipath-tools/libmultipath/config.c
@@ -452,6 +452,7 @@ load_config (char * file)
 	conf->multipath_dir = set_default(DEFAULT_MULTIPATHDIR);
 	conf->flush_on_last_del = 0;
 	conf->attribute_flags = 0;
+	conf->find_multipaths = DEFAULT_FIND_MULTIPATHS;
 
 	/*
 	 * preload default hwtable
Index: multipath-tools/libmultipath/config.h
===================================================================
--- multipath-tools.orig/libmultipath/config.h
+++ multipath-tools/libmultipath/config.h
@@ -85,6 +85,7 @@ struct config {
 	int attribute_flags;
 	int fast_io_fail;
 	unsigned int dev_loss;
+	int find_multipaths;
 	uid_t uid;
 	gid_t gid;
 	mode_t mode;
Index: multipath-tools/libmultipath/configure.c
===================================================================
--- multipath-tools.orig/libmultipath/configure.c
+++ multipath-tools/libmultipath/configure.c
@@ -35,6 +35,7 @@
 #include "alias.h"
 #include "prio.h"
 #include "util.h"
+#include "finder.h"
 
 extern int
 setup_map (struct multipath * mpp)
@@ -462,6 +463,10 @@ 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;
@@ -472,21 +477,35 @@ coalesce_paths (struct vectors * vecs, v
 
 		/* 1. if path has no unique id or wwid blacklisted */
 		if (memcmp(empty_buff, pp1->wwid, WWID_SIZE) == 0 ||
-		    filter_path(conf, pp1) > 0)
+		    filter_path(conf, pp1) > 0) {
+			orphan_path(pp1);
 			continue;
+		}
 
 		/* 2. if path already coalesced */
 		if (pp1->mpp)
 			continue;
 
 		/* 3. if path has disappeared */
-		if (!pp1->size)
+		if (!pp1->size) {
+			orphan_path(pp1);
 			continue;
+		}
 
 		/* 4. path is out of scope */
 		if (refwwid && strncmp(pp1->wwid, refwwid, WWID_SIZE))
 			continue;
 
+		/* If find_multipaths was selected check if the path is valid */
+		if (conf->find_multipaths){
+			if (refwwid || should_multipath(pp1, pathvec))
+				remember_wwid(pp1->wwid);
+			else {
+				orphan_path(pp1);
+				continue;
+			}
+		}
+
 		/*
 		 * at this point, we know we really got a new mp
 		 */
Index: multipath-tools/libmultipath/defaults.h
===================================================================
--- multipath-tools.orig/libmultipath/defaults.h
+++ multipath-tools/libmultipath/defaults.h
@@ -12,6 +12,7 @@
 #define DEFAULT_PGTIMEOUT      -PGTIMEOUT_NONE
 #define DEFAULT_USER_FRIENDLY_NAMES    0
 #define DEFAULT_VERBOSITY	2
+#define DEFAULT_FIND_MULTIPATHS 0
 
 #define DEFAULT_CHECKINT	5
 #define MAX_CHECKINT(a)		(a << 2)
@@ -20,5 +21,6 @@
 #define DEFAULT_SOCKET		"/var/run/multipathd.sock"
 #define DEFAULT_CONFIGFILE	"/etc/multipath.conf"
 #define DEFAULT_BINDINGS_FILE	"/etc/multipath/bindings"
+#define DEFAULT_WWIDS_FILE	"/etc/multipath/wwids"
 
 char * set_default (char * str);
Index: multipath-tools/libmultipath/dict.c
===================================================================
--- multipath-tools.orig/libmultipath/dict.c
+++ multipath-tools/libmultipath/dict.c
@@ -444,6 +444,27 @@ def_flush_on_last_del_handler(vector str
 }
 
 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
 names_handler(vector strvec)
 {
 	char * buff;
@@ -2076,6 +2097,18 @@ snprint_def_flush_on_last_del (char * bu
 }
 
 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 == DEFAULT_USER_FRIENDLY_NAMES)
@@ -2141,6 +2174,7 @@ init_keywords(void)
 	install_keyword("gid", &def_gid_handler, &snprint_def_gid);
 	install_keyword("fast_io_fail_tmo", &def_fast_io_fail_handler, &snprint_def_fast_io_fail);
 	install_keyword("dev_loss_tmo", &def_dev_loss_handler, &snprint_def_dev_loss);
+	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_getuid_callout", &def_getuid_callout_handler, NULL);
Index: multipath-tools/libmultipath/file.c
===================================================================
--- /dev/null
+++ multipath-tools/libmultipath/file.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2005 Christophe Varoqui
+ * Copyright (c) 2005 Benjamin Marzinski, Redhat
+ */
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <limits.h>
+#include <stdio.h>
+#include <signal.h>
+
+#include "file.h"
+#include "debug.h"
+#include "uxsock.h"
+
+
+/*
+ * significant parts of this file were taken from iscsi-bindings.c of the
+ * linux-iscsi project.
+ * Copyright (C) 2002 Cisco Systems, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+
+static int
+ensure_directories_exist(char *str, mode_t dir_mode)
+{
+	char *pathname;
+	char *end;
+	int err;
+
+	pathname = strdup(str);
+	if (!pathname){
+		condlog(0, "Cannot copy file pathname %s : %s",
+			str, strerror(errno));
+		return -1;
+	}
+	end = pathname;
+	/* skip leading slashes */
+	while (end && *end && (*end == '/'))
+		end++;
+
+	while ((end = strchr(end, '/'))) {
+		/* if there is another slash, make the dir. */
+		*end = '\0';
+		err = mkdir(pathname, dir_mode);
+		if (err && errno != EEXIST) {
+			condlog(0, "Cannot make directory [%s] : %s",
+				pathname, strerror(errno));
+			free(pathname);
+			return -1;
+		}
+		if (!err)
+			condlog(3, "Created dir [%s]", pathname);
+		*end = '/';
+		end++;
+	}
+	free(pathname);
+	return 0;
+}
+
+static void
+sigalrm(int sig)
+{
+	/* do nothing */
+}
+
+static int
+lock_file(int fd, char *file_name)
+{
+	struct sigaction act, oldact;
+	sigset_t set, oldset;
+	struct flock lock;
+	int err;
+
+	memset(&lock, 0, sizeof(lock));
+	lock.l_type = F_WRLCK;
+	lock.l_whence = SEEK_SET;
+
+	act.sa_handler = sigalrm;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = 0;
+	sigemptyset(&set);
+	sigaddset(&set, SIGALRM);
+
+	sigaction(SIGALRM, &act, &oldact);
+	sigprocmask(SIG_UNBLOCK, &set, &oldset);
+
+	alarm(FILE_TIMEOUT);
+	err = fcntl(fd, F_SETLKW, &lock);
+	alarm(0);
+
+	if (err) {
+		if (errno != EINTR)
+			condlog(0, "Cannot lock %s : %s", file_name,
+				strerror(errno));
+		else
+			condlog(0, "%s is locked. Giving up.", file_name);
+	}
+
+	sigprocmask(SIG_SETMASK, &oldset, NULL);
+	sigaction(SIGALRM, &oldact, NULL);
+	return err;
+}
+
+int
+open_file(char *file, int *can_write, char *header)
+{
+	int fd;
+	struct stat s;
+
+	if (ensure_directories_exist(file, 0700))
+		return -1;
+	*can_write = 1;
+	fd = open(file, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
+	if (fd < 0) {
+		if (errno == EROFS) {
+			*can_write = 0;
+			condlog(3, "Cannot open file [%s] read/write. "
+				" trying readonly", file);
+			fd = open(file, O_RDONLY);
+			if (fd < 0) {
+				condlog(0, "Cannot open file [%s] "
+					"readonly : %s", file, strerror(errno));
+				return -1;
+			}
+		}
+		else {
+			condlog(0, "Cannot open file [%s] : %s", file,
+				strerror(errno));
+			return -1;
+		}
+	}
+	if (*can_write && lock_file(fd, file) < 0)
+		goto fail;
+
+	memset(&s, 0, sizeof(s));
+	if (fstat(fd, &s) < 0){
+		condlog(0, "Cannot stat file %s : %s", file, strerror(errno));
+		goto fail;
+	}
+	if (s.st_size == 0) {
+		if (*can_write == 0)
+			goto fail;
+		/* If file is empty, write the header */
+		size_t len = strlen(header);
+		if (write_all(fd, header, len) != len) {
+			condlog(0,
+				"Cannot write header to file %s : %s", file,
+				strerror(errno));
+			/* cleanup partially written header */
+			ftruncate(fd, 0);
+			goto fail;
+		}
+		fsync(fd);
+		condlog(3, "Initialized new file [%s]", file);
+	}
+
+	return fd;
+
+fail:
+	close(fd);
+	return -1;
+}
Index: multipath-tools/libmultipath/file.h
===================================================================
--- /dev/null
+++ multipath-tools/libmultipath/file.h
@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2010 Benjamin Marzinski, Redhat
+ */
+
+#ifndef _FILE_H
+#define _FILE_H
+
+#define FILE_TIMEOUT 30
+int open_file(char *file, int *can_write, char *header);
+
+#endif /* _FILE_H */
Index: multipath-tools/libmultipath/finder.c
===================================================================
--- /dev/null
+++ multipath-tools/libmultipath/finder.c
@@ -0,0 +1,150 @@
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <limits.h>
+#include <stdio.h>
+
+#include "checkers.h"
+#include "vector.h"
+#include "structs.h"
+#include "debug.h"
+#include "uxsock.h"
+#include "file.h"
+#include "finder.h"
+#include "defaults.h"
+
+/*
+ * Copyright (c) 2010 Benjamin Marzinski, Redhat
+ */
+
+static int
+lookup_wwid(FILE *f, char *wwid) {
+	char buf[LINE_MAX];
+
+	while (fgets(buf, LINE_MAX, f)) {
+		char *c;
+
+		c = strpbrk(buf, "#\n\r");
+		if (c)
+			*c = '\0';
+		if (*buf == '\0')
+			continue;
+		if (strncmp(wwid, buf, WWID_SIZE) == 0)
+			return 1;
+	}
+	return 0;
+}
+
+static int
+write_out_wwid(int fd, char *wwid) {
+	int ret;
+	off_t offset;
+	char buf[WWID_SIZE + 1];
+
+	ret = snprintf(buf, WWID_SIZE + 1, "%s\n", wwid);
+	if (ret > WWID_SIZE || ret < 0){
+		condlog(0, "can't format wwid for writing (%d) : %s",
+			ret, strerror(errno));
+		return -1;
+	}
+	offset = lseek(fd, 0, SEEK_END);
+	if (offset < 0) {
+		condlog(0, "can't seek to the end of wwids file : %s",
+			strerror(errno));
+		return -1;
+	}
+	if (write_all(fd, buf, strlen(buf)) != strlen(buf)) {
+		condlog(0, "cannot write wwid to wwids file : %s",
+			strerror(errno));
+		ftruncate(fd, offset);
+		return -1;
+	}
+	return 1;
+}
+
+static int
+check_wwids_file(char *wwid, int write_wwid)
+{
+	int scan_fd, fd, can_write, found, ret;
+	FILE *f;
+	fd = open_file(DEFAULT_WWIDS_FILE, &can_write, WWIDS_FILE_HEADER);
+	if (fd < 0)
+		return -1;
+
+	scan_fd = dup(fd);
+	if (scan_fd < 0) {
+		condlog(0, "can't dup wwids file descriptor : %s",
+			strerror(errno));
+		close(fd);
+		return -1;
+	}
+	f = fdopen(scan_fd, "r");
+	if (!f) {
+		condlog(0,"can't fdopen wwids file : %s", strerror(errno));
+		close(fd);
+		close(scan_fd);
+		return -1;
+	}
+	found = lookup_wwid(f, wwid);
+	if (found) {
+		ret = 0;
+		goto out;
+	}
+	if (!write_wwid) {
+		ret = -1;
+		goto out;
+	}
+	if (!can_write) {
+		condlog(0, "wwids file is read-only. Can't write wwid");
+		ret = -1;
+		goto out;
+	}
+	ret = write_out_wwid(fd, wwid);
+out:
+	fclose(f);
+	close(scan_fd);
+	close(fd);
+	return ret;
+}
+
+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);
+	if (ret < 0){
+		condlog(3, "failed writing wwid %s to wwids file", wwid);
+		return -1;
+	}
+	if (ret == 1)
+		condlog(3, "wrote wwid %s to wwids file", wwid);
+	else
+		condlog(4, "wwid %s already in wwids file", wwid);
+	return 0;
+}
Index: multipath-tools/libmultipath/finder.h
===================================================================
--- /dev/null
+++ multipath-tools/libmultipath/finder.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2010 Benjamin Marzinski, Redhat
+ */
+
+#ifndef _FINDER_H
+#define _FINDER_H
+
+#define WWIDS_FILE_HEADER \
+"# Multipath wwids, Version : 1.0\n" \
+"# NOTE: This file is automatically maintained by multipath and multipathd.\n" \
+"# You should not need to edit this file in normal circumstances.\n" \
+"#\n" \
+"# Valid WWIDs:\n"
+
+int should_multipath(struct path *pp, vector pathvec);
+int remember_wwid(char *wwid);
+
+#endif /* _FINDER_H */
Index: multipath-tools/multipath/main.c
===================================================================
--- multipath-tools.orig/multipath/main.c
+++ multipath-tools/multipath/main.c
@@ -307,7 +307,7 @@ 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/multipathd/main.c
===================================================================
--- multipath-tools.orig/multipathd/main.c
+++ multipath-tools/multipathd/main.c
@@ -47,6 +47,7 @@
 #include <print.h>
 #include <configure.h>
 #include <prio.h>
+#include <finder.h>
 
 #include "main.h"
 #include "pidfile.h"
@@ -397,7 +398,7 @@ ev_add_path (char * devname, struct vect
 	 */
 	if (memcmp(empty_buff, pp->wwid, WWID_SIZE) == 0) {
 		condlog(0, "%s: failed to get path uid", devname);
-		return 1; /* leave path added to pathvec */
+		goto fail; /* leave path added to pathvec */
 	}
 	if (filter_path(conf, pp) > 0){
 		int i = find_slot(vecs->pathvec, (void *)pp);
@@ -412,18 +413,26 @@ rescan:
 		condlog(4,"%s: adopting all paths for path %s",
 			mpp->alias, pp->dev);
 		if (adopt_paths(vecs->pathvec, mpp))
-			return 1; /* leave path added to pathvec */
+			goto fail; /* leave path added to pathvec */
 
 		verify_paths(mpp, vecs, NULL);
 		mpp->flush_on_last_del = FLUSH_UNDEF;
 		mpp->action = ACT_RELOAD;
 	}
 	else {
+		if (conf->find_multipaths) {
+			if (should_multipath(pp, vecs->pathvec))
+				remember_wwid(pp->wwid);
+			else {
+				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;
 		else
-			return 1; /* leave path added to pathvec */
+			goto fail; /* leave path added to pathvec */
 	}
 
 	/*
@@ -432,7 +441,7 @@ rescan:
 	if (setup_map(mpp)) {
 		condlog(0, "%s: failed to setup map for addition of new "
 			"path %s", mpp->alias, devname);
-		goto out;
+		goto fail_map;
 	}
 	/*
 	 * reload the map for the multipath mapped device
@@ -450,7 +459,7 @@ rescan:
 			goto rescan;
 		}
 		else
-			goto out;
+			goto fail_map;
 	}
 	dm_lib_release();
 
@@ -458,19 +467,21 @@ rescan:
 	 * update our state from kernel regardless of create or reload
 	 */
 	if (setup_multipath(vecs, mpp))
-		goto out;
+		goto fail_map;
 
 	sync_map_state(mpp);
 
 	if (mpp->action == ACT_CREATE &&
 	    start_waiter_thread(mpp, vecs))
-			goto out;
+			goto fail_map;
 
 	condlog(2, "%s path added to devmap %s", devname, mpp->alias);
 	return 0;
 
-out:
+fail_map:
 	remove_map(mpp, vecs, 1);
+fail:
+	orphan_path(pp);
 	return 1;
 }
 
Index: multipath-tools/libmultipath/Makefile
===================================================================
--- multipath-tools.orig/libmultipath/Makefile
+++ multipath-tools/libmultipath/Makefile
@@ -12,7 +12,7 @@ OBJS = memory.o parser.o vector.o devmap
        pgpolicies.o debug.o regex.o defaults.o uevent.o \
        switchgroup.o uxsock.o print.o alias.o log_pthread.o \
        log.o configure.o structs_vec.o sysfs.o prio.o checkers.o \
-       lock.o waiter.o
+       lock.o waiter.o file.o finder.o
 
 LIBDM_API_FLUSH = $(shell if test -d /lib64 ; then objdump -T /lib64/libdevmapper.so* ; else objdump -T /lib/libdevmapper.so.* ; fi | grep -c dm_task_no_flush)
 
Index: multipath-tools/multipath/mpathconf
===================================================================
--- /dev/null
+++ multipath-tools/multipath/mpathconf
@@ -0,0 +1,232 @@
+#!/bin/sh
+#
+# Copyright (C) 2010 Red Hat, Inc. All rights reserved.
+#
+# This file is part of the device-mapper-multipath package.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+#
+# Simple editting of /etc/multipath.conf
+# This program was largely ripped off from lvmconf
+#
+
+DEFAULT_CONFIGFILE="/usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf"
+CONFIGFILE="/etc/multipath.conf"
+MULTIPATHDIR="/etc/multipath"
+TMPFILE=/etc/multipath/.multipath.conf.tmp
+
+function usage
+{
+	echo "usage: $0 <command>"
+	echo ""
+	echo "Commands:"
+	echo "Enable: --enable [--user_friendly_names <y|n>] [--find_multipaths <y|n>"
+	echo "Disable: --disable"
+	echo "Set user_friendly_names: --user_friendly_names <y|n>"
+	echo "Set find_multipaths: --find_multipaths <y|n>"
+	echo ""
+}
+
+function parse_args
+{
+	while [ -n "$1" ]; do
+		case $1 in
+			--enable)
+				ENABLE=1
+				shift
+				;;
+			--disable)
+				ENABLE=0
+				shift
+				;;
+			--user_friendly_names)
+				if [ -n "$2" ]; then
+					FRIENDLY=$2
+					shift 2
+				else
+					usage
+					exit 1
+				fi
+				;;
+			--find_multipaths)
+				if [ -n "$2" ]; then
+					FIND=$2
+					shift 2
+				else
+					usage
+					exit 1
+				fi
+				;;
+			*)
+				usage
+				exit
+		esac
+	done
+}
+
+function validate_args
+{
+	if [ "$ENABLE" = "0" ] && [ -n "$FRIENDLY" -o -n "$FIND" ]; then
+		echo "ignoring extra parameters on disable"
+		FRIENDLY=""
+		FIND=""
+	fi
+	if [ -n "$FRIENDLY" ] && [ "$FRIENDLY" != "y" -a "$FRIENDLY" != "n" ]; then
+		echo "--user_friendly_names must be either 'y' or 'n'"
+		exit 1
+	fi
+	if [ -n "$FIND" ] && [ "$FIND" != "y" -a "$FIND" != "n" ]; then
+		echo "--find_multipaths must be either 'y' or 'n'"
+		exit 1
+	fi
+	if [ -z "$ENABLE" -a -z "$FIND" -a -z "$FRIENDLY" ]; then
+		DISPLAY=1
+	fi
+}
+
+umask 0077
+
+parse_args "$@"
+
+validate_args
+
+if [ ! -d "$MULTIPATHDIR" ]; then
+	echo "/etc/multipath/ does not exist. failing"
+	exit 1
+fi
+
+rm $TMPFILE 2> /dev/null
+if [ -f "$CONFIGFILE" ]; then
+	cp $CONFIGFILE $TMPFILE
+elif [ -f "$DEFAULT_CONFIGFILE" ]; then
+	cp $DEFAULT_CONFIGFILE $TMPFILE
+else
+	touch $TMPFILE
+fi
+
+if grep -q "^blacklist[[:space:]]*{" $TMPFILE ; then
+	HAVE_BLACKLIST=1
+fi
+
+if grep -q "^defaults[[:space:]]*{" $TMPFILE ; then
+	HAVE_DEFAULTS=1
+fi
+
+if [ "$HAVE_BLACKLIST" = "1" ]; then
+	if sed -n '/^blacklist[[:space:]]*{/,/^}/ p' $TMPFILE | grep -q "^[[:space:]]*devnode \"\.\?\*\"" ; then
+		HAVE_DISABLE=1
+	elif sed -n '/^blacklist[[:space:]]*{/,/^}/ p' $TMPFILE | grep -q "^[[:space:]]*#[#[:space:]]*devnode \"\.\?\*\"" ; then
+		HAVE_DISABLE=0
+	fi
+fi
+
+if [ "$HAVE_DEFAULTS" = "1" ]; then
+	if sed -n '/^defaults[[:space:]]*{/,/^}/ p' $TMPFILE | grep -q "^[[:space:]]*find_multipaths[[:space:]]*\(yes\|1\)" ; then
+		HAVE_FIND=1
+	elif sed -n '/^defaults[[:space:]]*{/,/^}/ p' $TMPFILE | grep -q "^[[:space:]]*find_multipaths[[:space:]]*\(no\|0\)" ; then
+		HAVE_FIND=0
+	fi
+	if sed -n '/^defaults[[:space:]]*{/,/^}/ p' $TMPFILE | grep -q "^[[:space:]]*user_friendly_names[[:space:]]*\(yes\|1\)" ; then
+		HAVE_FRIENDLY=1
+	elif sed -n '/^defaults[[:space:]]*{/,/^}/ p' $TMPFILE | grep -q "^[[:space:]]*user_friendly_names[[:space:]]*\(no\|0\)" ; then
+		HAVE_FRIENDLY=0
+	fi
+fi
+
+if [ -n "$DISPLAY" ]; then
+	if [ -z "$HAVE_DISABLE" -o "$HAVE_DISABLE" = 0 ]; then
+		echo "multipath is enabled"
+	else
+		echo "multipath is disabled"
+	fi
+	if [ -z "$HAVE_FIND"  -o "$HAVE_FIND" = 0 ]; then
+		echo "find_multipaths is disabled"
+	else
+		echo "find_multipaths is enabled"
+	fi
+	if [ -z "$HAVE_FRIENDLY" -o "$HAVE_FRIENDLY" = 0 ]; then
+		echo "user_friendly_names is disabled"
+	else
+		echo "user_friendly_names is enabled"
+	fi
+	exit 0
+fi
+
+if [ -z "$HAVE_BLACKLIST" ]; then
+	cat >> $TMPFILE <<- _EOF_
+
+blacklist {
+}
+_EOF_
+fi
+
+if [ -z "$HAVE_DEFAULTS" ]; then
+	cat >> $TMPFILE <<- _EOF_
+
+defaults {
+}
+_EOF_
+fi
+
+if [ "$ENABLE" = 1 ]; then
+	if [ "$HAVE_DISABLE" = 1 ]; then
+		sed -i '/^blacklist[[:space:]]*{/,/^}/ s/^[[:space:]]*devnode \"\.\?\*\"/#	devnode ".*"/' $TMPFILE
+	fi
+elif [ "$ENABLE" = 0 ]; then
+	if [ -z "$HAVE_DISABLE" ]; then
+		sed -i '/^blacklist[[:space:]]*{/ a\
+	devnode "*"
+' $TMPFILE
+	elif [ "$HAVE_DISABLE" = 0 ]; then
+		sed -i '/^blacklist[[:space:]]*{/,/^}/ s/^[[:space:]]*#[#[:space:]]*devnode \"\.\?\*\"/	devnode ".*"/' $TMPFILE
+	fi
+fi
+
+if [ "$FIND" = "n" ]; then
+	if [ "$HAVE_FIND" = 1 ]; then
+		sed -i '/^defaults[[:space:]]*{/,/^}/ s/^[[:space:]]*find_multipaths[[:space:]]*\(yes\|1\)/	find_multipaths no/' $TMPFILE
+	fi
+elif [ "$FIND" = "y" ]; then
+	if [ -z "$HAVE_FIND" ]; then
+		sed -i '/^defaults[[:space:]]*{/ a\
+	find_multipaths yes
+' $TMPFILE
+	elif [ "$HAVE_FIND" = 0 ]; then
+		sed -i '/^defaults[[:space:]]*{/,/^}/ s/^[[:space:]]*find_multipaths[[:space:]]*\(no\|0\)/	find_multipaths yes/' $TMPFILE
+	fi
+fi
+
+if [ "$FRIENDLY" = "n" ]; then
+	if [ "$HAVE_FRIENDLY" = 1 ]; then
+		sed -i '/^defaults[[:space:]]*{/,/^}/ s/^[[:space:]]*user_friendly_names[[:space:]]*\(yes\|1\)/	user_friendly_names no/' $TMPFILE
+	fi
+elif [ "$FRIENDLY" = "y" ]; then
+	if [ -z "$HAVE_FRIENDLY" ]; then
+		sed -i '/^defaults[[:space:]]*{/ a\
+	user_friendly_names yes
+' $TMPFILE
+	elif [ "$HAVE_FRIENDLY" = 0 ]; then
+		sed -i '/^defaults[[:space:]]*{/,/^}/ s/^[[:space:]]*user_friendly_names[[:space:]]*\(no\|0\)/	user_friendly_names yes/' $TMPFILE
+	fi
+fi
+
+cp $CONFIGFILE $CONFIGFILE.old
+if [ $? != 0 ]; then
+	echo "failed to backup old config file, $CONFIGFILE not updated"
+	exit 1
+fi
+
+cp $TMPFILE $CONFIGFILE
+if [ $? != 0 ]; then
+	echo "failed to copy new config file into place, check $CONFIGFILE is still OK"
+	exit 1
+fi
+
+rm -f $TMPFILE
Index: multipath-tools/multipath/Makefile
===================================================================
--- multipath-tools.orig/multipath/Makefile
+++ multipath-tools/multipath/Makefile
@@ -21,6 +21,7 @@ $(EXEC): $(OBJS)
 install:
 	$(INSTALL_PROGRAM) -d $(DESTDIR)$(bindir)
 	$(INSTALL_PROGRAM) -m 755 $(EXEC) $(DESTDIR)$(bindir)/
+	$(INSTALL_PROGRAM) -m 755 mpathconf $(DESTDIR)$(bindir)/
 	$(INSTALL_PROGRAM) -d $(DESTDIR)/lib/udev/rules.d
 	$(INSTALL_PROGRAM) -m 644 multipath.rules $(DESTDIR)/lib/udev/rules.d/40-multipath.rules
 	$(INSTALL_PROGRAM) -d $(DESTDIR)$(mandir)
@@ -31,6 +32,7 @@ install:
 uninstall:
 	rm $(DESTDIR)/lib/udev/rules.d/multipath.rules
 	rm $(DESTDIR)$(bindir)/$(EXEC)
+	rm $(DESTDIR)$(bindir)/mpathconf
 	rm $(DESTDIR)$(mandir)/$(EXEC).8.gz
 	rm $(DESTDIR)$(man5dir)/$(EXEC).conf.5.gz