device-mapper-multipath/0013-RH-trigger-change-uevent-on-new-device-creation.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Benjamin Marzinski <bmarzins@redhat.com>
Date: Mon, 24 Apr 2017 09:39:57 -0500
Subject: [PATCH] RH: trigger change uevent on new device creation

When multipath first sees a path device with user_friendly names
enabled, it can't know if the device should be multipathed. This means
that it will not claim the device in udev.  If the device is eventually
multipathed, multipath should trigger a change uevent to update the udev
database to claim the device.

This also reverts commit 64e27ec066a001012f44550f095c93443e91d845.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
 libmultipath/configure.c | 26 ++++++++++++++++++++++++--
 libmultipath/configure.h |  1 +
 libmultipath/wwids.c     |  4 ++--
 multipath/main.c         |  2 +-
 multipathd/main.c        |  7 ++-----
 5 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/libmultipath/configure.c b/libmultipath/configure.c
index e2f393f..64d7751 100644
--- a/libmultipath/configure.c
+++ b/libmultipath/configure.c
@@ -423,6 +423,28 @@ trigger_udev_change(const struct multipath *mpp)
 	udev_device_unref(udd);
 }
 
+void
+trigger_paths_udev_change(const struct multipath *mpp)
+{
+	struct pathgroup * pgp;
+	struct path * pp;
+	int i, j;
+
+	if (!mpp || !mpp->pg)
+		return;
+
+	vector_foreach_slot (mpp->pg, pgp, i) {
+		if (!pgp->paths)
+			continue;
+		vector_foreach_slot(pgp->paths, pp, j) {
+			if (!pp->udev)
+				continue;
+			sysfs_attr_set_value(pp->udev, "uevent", "change",
+					     strlen("change"));
+		}
+	}
+}
+
 static int
 is_mpp_known_to_udev(const struct multipath *mpp)
 {
@@ -814,8 +836,8 @@ int domap(struct multipath *mpp, char *params, int is_daemon)
 		 * succeeded
 		 */
 		mpp->force_udev_reload = 0;
-		if (mpp->action == ACT_CREATE)
-			remember_wwid(mpp->wwid);
+		if (mpp->action == ACT_CREATE && remember_wwid(mpp->wwid) == 1)
+			trigger_paths_udev_change(mpp);
 		if (!is_daemon) {
 			/* multipath client mode */
 			dm_switchgroup(mpp->alias, mpp->bestpg);
diff --git a/libmultipath/configure.h b/libmultipath/configure.h
index 0ffc28e..09603ba 100644
--- a/libmultipath/configure.h
+++ b/libmultipath/configure.h
@@ -37,3 +37,4 @@ int get_refwwid (enum mpath_cmds cmd, char * dev, enum devtypes dev_type,
 int reload_map(struct vectors *vecs, struct multipath *mpp, int refresh, int is_daemon);
 int sysfs_get_host_adapter_name(struct path *pp, char *adapter_name);
 struct udev_device *get_udev_device(const char *dev, enum devtypes dev_type);
+void trigger_paths_udev_change(const struct multipath *mpp);
diff --git a/libmultipath/wwids.c b/libmultipath/wwids.c
index 88bb72b..249c6c1 100644
--- a/libmultipath/wwids.c
+++ b/libmultipath/wwids.c
@@ -319,7 +319,7 @@ remember_wwid(char *wwid)
 		condlog(3, "wrote wwid %s to wwids file", wwid);
 	else
 		condlog(4, "wwid %s already in wwids file", wwid);
-	return 0;
+	return ret;
 }
 
 int remember_cmdline_wwid(void)
@@ -353,7 +353,7 @@ int remember_cmdline_wwid(void)
 			next++;
 		}
 		if (strlen(ptr)) {
-			if (remember_wwid(ptr) != 0)
+			if (remember_wwid(ptr) < 0)
 				ret = -1;
 		}
 		else {
diff --git a/multipath/main.c b/multipath/main.c
index 2e69300..4dde5af 100644
--- a/multipath/main.c
+++ b/multipath/main.c
@@ -412,7 +412,7 @@ configure (struct config *conf, enum mpath_cmds cmd,
 		}
 		if (cmd == CMD_ADD_WWID) {
 			r = remember_wwid(refwwid);
-			if (r == 0)
+			if (r >= 0)
 				printf("wwid '%s' added\n", refwwid);
 			else
 				printf("failed adding '%s' to wwids file\n",
diff --git a/multipathd/main.c b/multipathd/main.c
index c475fcd..50749a8 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -2138,7 +2138,8 @@ configure (struct vectors * vecs, int start_waiters)
 
 	sync_maps_state(mpvec);
 	vector_foreach_slot(mpvec, mpp, i){
-		remember_wwid(mpp->wwid);
+		if (remember_wwid(mpp->wwid) == 1)
+			trigger_paths_udev_change(mpp);
 		update_map_pr(mpp);
 	}
 
@@ -2220,10 +2221,6 @@ reconfigure (struct vectors * vecs)
 		conf->verbosity = verbosity;
 	if (bindings_read_only)
 		conf->bindings_read_only = bindings_read_only;
-	if (conf->find_multipaths) {
-		condlog(2, "find_multipaths is set: -n is implied");
-		ignore_new_devs = 1;
-	}
 	if (ignore_new_devs)
 		conf->ignore_new_devs = ignore_new_devs;
 	uxsock_timeout = conf->uxsock_timeout;
-- 
2.7.4