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, 1 deletions

diff --git a/sys/geom/geom.h b/sys/geom/geom.h
index df7ecb5..018c8f6 100644
--- a/sys/geom/geom.h
+++ b/sys/geom/geom.h
@@ -180,9 +180,11 @@ void g_trace(int level, char *, ...);
 
 
 /* geom_event.c */
+typedef void g_call_me_t(void *);
+int g_call_me(g_call_me_t *func, void *arg);
 void g_orphan_provider(struct g_provider *pp, int error);
-void g_waitidle(void);
 void g_silence(void);
+void g_waitidle(void);
 
 /* geom_subr.c */
 int g_access_abs(struct g_consumer *cp, int read, int write, int exclusive);