dlm: Avoid that dlm_release_lockspace() incorrectly returns -EBUSY

When dlm_release_lockspace(ls, 1) is invoked on a busy system
immediately after the last dlm_unlock() AST has finished it can occur
that lkb_idr_is_local() is invoked for the unlocked LKB since removal
from ls_lkbidr only occurs after the AST has returned. If that happens
dlm_release_lockspace(ls, 1) will return -EBUSY instead of releasing
the lockspace. Fix this race condition by changing lkb_idr_is_local()
such that it only returns true for LKB's that have not yet been
unlocked.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lockspace.c

@@ -706,9 +706,7 @@ static int lkb_idr_is_local(int id, void *p, void *data)
 {
 	struct dlm_lkb *lkb = p;
 
-	if (!lkb->lkb_nodeid)
-		return 1;
-	return 0;
+	return lkb->lkb_nodeid == 0 && lkb->lkb_grmode != DLM_LOCK_IV;
 }
 
 static int lkb_idr_is_any(int id, void *p, void *data)