Implement g_call_me() as a way for geom methods to schedule operations

to be performed in the event-thread.

To do this, we need to lock the eventlist with g_eventlock (nee g_doorlock),
since g_call_me() being called from the UP/DOWN paths will not be able to
aquire g_topology_lock.

This also means that for now these events are not referenced on any
particular consumer/provider/geom.

For UP/DOWN path use, this will not become a problem since the access()
function will make sure we drain any bio's before we dismantle.

Sponsored by:   DARPA & NAI Labs.

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/geom/geom_int.h b/sys/geom/geom_int.h
index b7a5ad6..33fd675 100644
--- a/sys/geom/geom_int.h
+++ b/sys/geom/geom_int.h
@@ -51,6 +51,7 @@ enum g_events {
 	EV_NEW_CLASS,		/* class */
 	EV_NEW_PROVIDER,	/* provider */
 	EV_SPOILED,		/* provider, consumer */
+	EV_CALL_ME,		/* func, arg */
 	EV_LAST
 };
 
@@ -61,6 +62,8 @@ struct g_event {
 	struct g_geom		*geom;
 	struct g_provider	*provider;
 	struct g_consumer	*consumer;
+	void			*arg;
+	g_call_me_t		*func;
 };
 
 /* geom_dump.c */