udevd: optionally watch device nodes with inotify

This allows you to re-process the rules if the content of the device
has been changed, most useful for block subsystem to cause vol_id to
be run again.

1 files changed, 8 insertions, 0 deletions

diff --git a/udev/udev-event.c b/udev/udev-event.c
index e34f09cfe3..592da01099 100644
--- a/udev/udev-event.c
+++ b/udev/udev-event.c
@@ -600,6 +600,14 @@ int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
 
 		/* create new node and symlinks */
 		err = udev_node_add(dev, event->mode, event->uid, event->gid);
+
+		/* watch for changes */
+		if (event->inotify_watch && inotify_fd != -1) {
+			info(event->udev, "device will be watched for changes\n");
+			udev_watch_begin(event->udev, event->dev);
+		} else {
+			udev_watch_clear(event->udev, event->dev);
+		}
 		goto exit;
 	}