[dm-devel] [PATCH v2 06/20] libmultipath: trigger path uevent only when necessary

[Martin Wilck]

Paths that are already classified as DM_MULTIPATH_DEVICE_PATH don't
need to be retriggered.

Signed-off-by: Martin Wilck <mwilck at suse.com>
---
 libmultipath/configure.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libmultipath/configure.c b/libmultipath/configure.c
index 245bd11672cb..838d145a5aa2 100644
--- a/libmultipath/configure.c
+++ b/libmultipath/configure.c
@@ -456,8 +456,20 @@ trigger_paths_udev_change(const struct multipath *mpp)
 		if (!pgp->paths)
 			continue;
 		vector_foreach_slot(pgp->paths, pp, j) {
+			const char *env;
+
 			if (!pp->udev)
 				continue;
+			/*
+			 * Paths that are already classified as multipath
+			 * members don't need another uevent.
+			 */
+			env = udev_device_get_property_value(
+				pp->udev, "DM_MULTIPATH_DEVICE_PATH");
+			if (env != NULL && !strcmp(env, "1"))
+					continue;
+
+			condlog(4, "triggering change uevent for %s", pp->dev);
 			sysfs_attr_set_value(pp->udev, "uevent", "change",
 					     strlen("change"));
 		}
-- 
2.16.1