Never resend AST requests.

b=13596
i=adilger
i=deen
original patch by green

lustre/ChangeLog

@@ -44,6 +44,11 @@ Details    : "lfs find -obd UUID" will return all directory names instead
              of just file names. It is incorrect because the directories
              do not reside on the OSTs.
 
+Severity   : normal
+Bugzilla   : 13596
+Description: MDS hang after unclean shutdown of lots of clients
+Details    : Never resend AST requests.
+
 --------------------------------------------------------------------------------
 
 2007-09-27         Cluster File Systems, Inc. <info@clusterfs.com>

lustre/ldlm/ldlm_lockd.c

@@ -567,6 +567,7 @@ int ldlm_server_blocking_ast(struct ldlm_lock *lock,
         req->rq_async_args.pointer_arg[0] = arg;
         req->rq_async_args.pointer_arg[1] = lock;
         req->rq_interpret_reply = ldlm_cb_interpret;
+        req->rq_no_resend = 1;
 
         lock_res(lock->l_resource);
         if (lock->l_granted_mode != lock->l_req_mode) {
@@ -668,6 +669,7 @@ int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
         req->rq_async_args.pointer_arg[0] = arg;
         req->rq_async_args.pointer_arg[1] = lock;
         req->rq_interpret_reply = ldlm_cb_interpret;
+        req->rq_no_resend = 1;
 
         body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
         body->lock_handle[0] = lock->l_remote_handle;