libceph: kill ceph_osdc_wait_event()

There are no actual users of ceph_osdc_wait_event().  This would
have been one-shot events, but we no longer support those so just
get rid of this function.

Since this leaves nothing else that waits for the completion of an
event, we can get rid of the completion in a struct ceph_osd_event.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

include/linux/ceph/osd_client.h

@@ -107,7 +107,6 @@ struct ceph_osd_event {
 	struct rb_node node;
 	struct list_head osd_node;
 	struct kref kref;
-	struct completion completion;
 };
 
 struct ceph_osd_event_work {
@@ -275,8 +274,6 @@ extern int ceph_osdc_create_event(struct ceph_osd_client *osdc,
 				  void (*event_cb)(u64, u64, u8, void *),
 				  void *data, struct ceph_osd_event **pevent);
 extern void ceph_osdc_cancel_event(struct ceph_osd_event *event);
-extern int ceph_osdc_wait_event(struct ceph_osd_event *event,
-				unsigned long timeout);
 extern void ceph_osdc_put_event(struct ceph_osd_event *event);
 #endif
 

net/ceph/osd_client.c

@@ -1494,7 +1494,6 @@ int ceph_osdc_create_event(struct ceph_osd_client *osdc,
 	RB_CLEAR_NODE(&event->node);
 	kref_init(&event->kref);   /* one ref for us */
 	kref_get(&event->kref);    /* one ref for the caller */
-	init_completion(&event->completion);
 
 	spin_lock(&osdc->event_lock);
 	event->cookie = ++osdc->event_count;
@@ -1530,7 +1529,6 @@ static void do_event_work(struct work_struct *work)
 
 	dout("do_event_work completing %p\n", event);
 	event->cb(ver, notify_id, opcode, event->data);
-	complete(&event->completion);
 	dout("do_event_work completed %p\n", event);
 	ceph_osdc_put_event(event);
 	kfree(event_work);
@@ -1588,7 +1586,6 @@ static void handle_watch_notify(struct ceph_osd_client *osdc,
 	return;
 
 done_err:
-	complete(&event->completion);
 	ceph_osdc_put_event(event);
 	return;
 
@@ -1597,21 +1594,6 @@ static void handle_watch_notify(struct ceph_osd_client *osdc,
 	return;
 }
 
-int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
-{
-	int err;
-
-	dout("wait_event %p\n", event);
-	err = wait_for_completion_interruptible_timeout(&event->completion,
-							timeout * HZ);
-	ceph_osdc_put_event(event);
-	if (err > 0)
-		err = 0;
-	dout("wait_event %p returns %d\n", event, err);
-	return err;
-}
-EXPORT_SYMBOL(ceph_osdc_wait_event);
-
 /*
  * Register request, send initial attempt.
  */