1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_RPC
39 #include <liblustre.h>
41 #include <obd_support.h>
42 #include <lustre_net.h>
43 #include <lustre_lib.h>
45 #include "ptlrpc_internal.h"
47 static int ptl_send_buf (lnet_handle_md_t *mdh, void *base, int len,
48 lnet_ack_req_t ack, struct ptlrpc_cb_id *cbid,
49 struct ptlrpc_connection *conn, int portal, __u64 xid,
56 LASSERT (portal != 0);
57 LASSERT (conn != NULL);
58 CDEBUG (D_INFO, "conn=%p id %s\n", conn, libcfs_id2str(conn->c_peer));
61 md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
62 md.options = PTLRPC_MD_OPTIONS;
64 md.eq_handle = ptlrpc_eq_h;
66 if (unlikely(ack == LNET_ACK_REQ &&
67 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
68 /* don't ask for the ack to simulate failing client */
72 rc = LNetMDBind (md, LNET_UNLINK, mdh);
73 if (unlikely(rc != 0)) {
74 CERROR ("LNetMDBind failed: %d\n", rc);
75 LASSERT (rc == -ENOMEM);
79 CDEBUG(D_NET, "Sending %d bytes to portal %d, xid "LPD64", offset %u\n",
80 len, portal, xid, offset);
82 rc = LNetPut (conn->c_self, *mdh, ack,
83 conn->c_peer, portal, xid, offset, 0);
84 if (unlikely(rc != 0)) {
86 /* We're going to get an UNLINK event when I unlink below,
87 * which will complete just like any other failed send, so
88 * I fall through and return success here! */
89 CERROR("LNetPut(%s, %d, "LPD64") failed: %d\n",
90 libcfs_id2str(conn->c_peer), portal, xid, rc);
91 rc2 = LNetMDUnlink(*mdh);
92 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
98 int ptlrpc_start_bulk_transfer (struct ptlrpc_bulk_desc *desc)
100 struct ptlrpc_connection *conn = desc->bd_export->exp_connection;
107 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
110 /* NB no locking required until desc is on the network */
111 LASSERT (!desc->bd_network_rw);
112 LASSERT (desc->bd_type == BULK_PUT_SOURCE ||
113 desc->bd_type == BULK_GET_SINK);
114 desc->bd_success = 0;
116 md.user_ptr = &desc->bd_cbid;
117 md.eq_handle = ptlrpc_eq_h;
118 md.threshold = 2; /* SENT and ACK/REPLY */
119 md.options = PTLRPC_MD_OPTIONS;
120 ptlrpc_fill_bulk_md(&md, desc);
122 LASSERT (desc->bd_cbid.cbid_fn == server_bulk_callback);
123 LASSERT (desc->bd_cbid.cbid_arg == desc);
125 /* NB total length may be 0 for a read past EOF, so we send a 0
126 * length bulk, since the client expects a bulk event. */
128 rc = LNetMDBind(md, LNET_UNLINK, &desc->bd_md_h);
130 CERROR("LNetMDBind failed: %d\n", rc);
131 LASSERT (rc == -ENOMEM);
135 /* Client's bulk and reply matchbits are the same */
136 xid = desc->bd_req->rq_xid;
137 CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
138 "id %s xid "LPX64"\n", desc->bd_iov_count,
139 desc->bd_nob, desc->bd_portal,
140 libcfs_id2str(conn->c_peer), xid);
142 /* Network is about to get at the memory */
143 desc->bd_network_rw = 1;
145 if (desc->bd_type == BULK_PUT_SOURCE)
146 rc = LNetPut (conn->c_self, desc->bd_md_h, LNET_ACK_REQ,
147 conn->c_peer, desc->bd_portal, xid, 0, 0);
149 rc = LNetGet (conn->c_self, desc->bd_md_h,
150 conn->c_peer, desc->bd_portal, xid, 0);
153 /* Can't send, so we unlink the MD bound above. The UNLINK
154 * event this creates will signal completion with failure,
155 * so we return SUCCESS here! */
156 CERROR("Transfer(%s, %d, "LPX64") failed: %d\n",
157 libcfs_id2str(conn->c_peer), desc->bd_portal, xid, rc);
158 rc2 = LNetMDUnlink(desc->bd_md_h);
165 void ptlrpc_abort_bulk (struct ptlrpc_bulk_desc *desc)
167 /* Server side bulk abort. Idempotent. Not thread-safe (i.e. only
168 * serialises with completion callback) */
169 struct l_wait_info lwi;
172 LASSERT (!in_interrupt ()); /* might sleep */
174 if (!ptlrpc_bulk_active(desc)) /* completed or */
175 return; /* never started */
177 /* Do not send any meaningful data over the wire for evicted clients */
178 if (desc->bd_export && desc->bd_export->exp_failed)
179 ptl_rpc_wipe_bulk_pages(desc);
181 /* The unlink ensures the callback happens ASAP and is the last
182 * one. If it fails, it must be because completion just happened,
183 * but we must still l_wait_event() in this case, to give liblustre
184 * a chance to run server_bulk_callback()*/
186 LNetMDUnlink (desc->bd_md_h);
189 /* Network access will complete in finite time but the HUGE
190 * timeout lets us CWARN for visibility of sluggish NALs */
191 lwi = LWI_TIMEOUT (cfs_time_seconds(300), NULL, NULL);
192 rc = l_wait_event(desc->bd_waitq,
193 !ptlrpc_bulk_active(desc), &lwi);
197 LASSERT(rc == -ETIMEDOUT);
198 CWARN("Unexpectedly long timeout: desc %p\n", desc);
202 int ptlrpc_register_bulk (struct ptlrpc_request *req)
204 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
205 lnet_process_id_t peer;
208 lnet_handle_me_t me_h;
212 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
215 /* NB no locking required until desc is on the network */
216 LASSERT (desc->bd_nob > 0);
217 LASSERT (!desc->bd_network_rw);
218 LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
219 LASSERT (desc->bd_req != NULL);
220 LASSERT (desc->bd_type == BULK_PUT_SINK ||
221 desc->bd_type == BULK_GET_SOURCE);
223 desc->bd_success = 0;
225 peer = desc->bd_import->imp_connection->c_peer;
227 md.user_ptr = &desc->bd_cbid;
228 md.eq_handle = ptlrpc_eq_h;
229 md.threshold = 1; /* PUT or GET */
230 md.options = PTLRPC_MD_OPTIONS |
231 ((desc->bd_type == BULK_GET_SOURCE) ?
232 LNET_MD_OP_GET : LNET_MD_OP_PUT);
233 ptlrpc_fill_bulk_md(&md, desc);
235 LASSERT (desc->bd_cbid.cbid_fn == client_bulk_callback);
236 LASSERT (desc->bd_cbid.cbid_arg == desc);
238 /* XXX Registering the same xid on retried bulk makes my head
239 * explode trying to understand how the original request's bulk
240 * might interfere with the retried request -eeb */
241 LASSERTF (!desc->bd_registered || req->rq_xid != desc->bd_last_xid,
242 "registered: %d rq_xid: "LPU64" bd_last_xid: "LPU64"\n",
243 desc->bd_registered, req->rq_xid, desc->bd_last_xid);
244 desc->bd_registered = 1;
245 desc->bd_last_xid = req->rq_xid;
247 rc = LNetMEAttach(desc->bd_portal, peer,
248 req->rq_xid, 0, LNET_UNLINK, LNET_INS_AFTER, &me_h);
250 CERROR("LNetMEAttach failed: %d\n", rc);
251 LASSERT (rc == -ENOMEM);
255 /* About to let the network at it... */
256 desc->bd_network_rw = 1;
257 rc = LNetMDAttach(me_h, md, LNET_UNLINK, &desc->bd_md_h);
259 CERROR("LNetMDAttach failed: %d\n", rc);
260 LASSERT (rc == -ENOMEM);
261 desc->bd_network_rw = 0;
262 rc2 = LNetMEUnlink (me_h);
267 CDEBUG(D_NET, "Setup bulk %s buffers: %u pages %u bytes, xid "LPX64", "
269 desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
270 desc->bd_iov_count, desc->bd_nob,
271 req->rq_xid, desc->bd_portal);
275 void ptlrpc_unregister_bulk (struct ptlrpc_request *req)
277 /* Disconnect a bulk desc from the network. Idempotent. Not
278 * thread-safe (i.e. only interlocks with completion callback). */
279 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
281 struct l_wait_info lwi;
284 LASSERT (!in_interrupt ()); /* might sleep */
286 if (!ptlrpc_bulk_active(desc)) /* completed or */
287 return; /* never registered */
289 LASSERT (desc->bd_req == req); /* bd_req NULL until registered */
291 /* the unlink ensures the callback happens ASAP and is the last
292 * one. If it fails, it must be because completion just happened,
293 * but we must still l_wait_event() in this case to give liblustre
294 * a chance to run client_bulk_callback() */
296 LNetMDUnlink (desc->bd_md_h);
298 if (req->rq_set != NULL)
299 wq = &req->rq_set->set_waitq;
301 wq = &req->rq_reply_waitq;
304 /* Network access will complete in finite time but the HUGE
305 * timeout lets us CWARN for visibility of sluggish NALs */
306 lwi = LWI_TIMEOUT (cfs_time_seconds(300), NULL, NULL);
307 rc = l_wait_event(*wq, !ptlrpc_bulk_active(desc), &lwi);
311 LASSERT (rc == -ETIMEDOUT);
312 DEBUG_REQ(D_WARNING,req,"Unexpectedly long timeout: desc %p",
317 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
319 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
320 int service_time = max_t(int, cfs_time_current_sec() -
321 req->rq_arrival_time.tv_sec, 1);
323 if (!(flags & PTLRPC_REPLY_EARLY) &&
324 (req->rq_type != PTL_RPC_MSG_ERR)) {
325 /* early replies and errors don't count toward our service
327 int oldse = at_add(&svc->srv_at_estimate, service_time);
329 DEBUG_REQ(D_ADAPTTO, req,
330 "svc %s changed estimate from %d to %d",
331 svc->srv_name, oldse,
332 at_get(&svc->srv_at_estimate));
334 /* Report actual service time for client latency calc */
335 lustre_msg_set_service_time(req->rq_repmsg, service_time);
336 /* Report service time estimate for future client reqs, but report 0
337 * (to be ignored by client) if it's a error reply during recovery.
339 if (req->rq_type == PTL_RPC_MSG_ERR &&
340 (req->rq_export == NULL || req->rq_export->exp_obd->obd_recovering))
341 lustre_msg_set_timeout(req->rq_repmsg, 0);
343 lustre_msg_set_timeout(req->rq_repmsg,
344 at_get(&svc->srv_at_estimate));
346 if (req->rq_reqmsg &&
347 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
348 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
349 "req_flags=%#x magic=%d:%x/%x len=%d\n",
350 flags, lustre_msg_get_flags(req->rq_reqmsg),
351 lustre_msg_is_v1(req->rq_reqmsg),
352 lustre_msg_get_magic(req->rq_reqmsg),
353 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
357 int ptlrpc_send_reply (struct ptlrpc_request *req, int flags)
359 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
360 struct ptlrpc_reply_state *rs = req->rq_reply_state;
361 struct ptlrpc_connection *conn;
364 /* We must already have a reply buffer (only ptlrpc_error() may be
365 * called without one). The reply generated by sptlrpc layer (e.g.
366 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
367 * have a request buffer which is either the actual (swabbed) incoming
368 * request, or a saved copy if this is a req saved in
369 * target_queue_final_reply().
371 LASSERT (req->rq_no_reply == 0);
372 LASSERT (req->rq_reqbuf != NULL);
373 LASSERT (rs != NULL);
374 LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
375 LASSERT (req->rq_repmsg != NULL);
376 LASSERT (req->rq_repmsg == rs->rs_msg);
377 LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
378 LASSERT (rs->rs_cb_id.cbid_arg == rs);
380 /* There may be no rq_export during failover */
382 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
383 req->rq_export->exp_obd->obd_fail)) {
384 /* Failed obd's only send ENODEV */
385 req->rq_type = PTL_RPC_MSG_ERR;
386 req->rq_status = -ENODEV;
387 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
388 req->rq_export->exp_obd->obd_minor);
391 if (req->rq_type != PTL_RPC_MSG_ERR)
392 req->rq_type = PTL_RPC_MSG_REPLY;
394 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
395 lustre_msg_set_status(req->rq_repmsg, req->rq_status);
396 lustre_msg_set_opc(req->rq_repmsg,
397 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
399 target_pack_pool_reply(req);
401 ptlrpc_at_set_reply(req, flags);
403 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
404 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
406 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
408 if (unlikely(conn == NULL)) {
409 CERROR("not replying on NULL connection\n"); /* bug 9635 */
412 atomic_inc (&svc->srv_outstanding_replies);
413 ptlrpc_rs_addref(rs); /* +1 ref for the network */
415 rc = sptlrpc_svc_wrap_reply(req);
419 req->rq_sent = cfs_time_current_sec();
421 rc = ptl_send_buf (&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
422 rs->rs_difficult ? LNET_ACK_REQ : LNET_NOACK_REQ,
423 &rs->rs_cb_id, conn, svc->srv_rep_portal,
424 req->rq_xid, req->rq_reply_off);
426 if (unlikely(rc != 0)) {
427 atomic_dec (&svc->srv_outstanding_replies);
428 ptlrpc_req_drop_rs(req);
430 ptlrpc_connection_put(conn);
434 int ptlrpc_reply (struct ptlrpc_request *req)
436 if (req->rq_no_reply)
439 return (ptlrpc_send_reply(req, 0));
442 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
447 if (req->rq_no_reply)
450 if (!req->rq_repmsg) {
451 rc = lustre_pack_reply(req, 1, NULL, NULL);
456 req->rq_type = PTL_RPC_MSG_ERR;
458 rc = ptlrpc_send_reply(req, may_be_difficult);
462 int ptlrpc_error(struct ptlrpc_request *req)
464 return ptlrpc_send_error(req, 0);
467 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
471 struct ptlrpc_connection *connection;
472 lnet_handle_me_t reply_me_h;
474 struct obd_device *obd = request->rq_import->imp_obd;
477 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
480 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
481 LASSERT(request->rq_wait_ctx == 0);
483 /* If this is a re-transmit, we're required to have disengaged
484 * cleanly from the previous attempt */
485 LASSERT (!request->rq_receiving_reply);
487 if (request->rq_import->imp_obd &&
488 request->rq_import->imp_obd->obd_fail) {
489 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
490 request->rq_import->imp_obd->obd_name);
491 /* this prevents us from waiting in ptlrpc_queue_wait */
496 connection = request->rq_import->imp_connection;
498 lustre_msg_set_handle(request->rq_reqmsg,
499 &request->rq_import->imp_remote_handle);
500 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
501 lustre_msg_set_conn_cnt(request->rq_reqmsg,
502 request->rq_import->imp_conn_cnt);
503 lustre_msghdr_set_flags(request->rq_reqmsg,
504 request->rq_import->imp_msghdr_flags);
506 rc = sptlrpc_cli_wrap_request(request);
510 /* bulk register should be done after wrap_request() */
511 if (request->rq_bulk != NULL) {
512 rc = ptlrpc_register_bulk (request);
518 LASSERT (request->rq_replen != 0);
519 if (request->rq_repbuf == NULL) {
520 LASSERT(request->rq_repdata == NULL);
521 LASSERT(request->rq_repmsg == NULL);
522 rc = sptlrpc_cli_alloc_repbuf(request,
525 GOTO(cleanup_bulk, rc);
527 request->rq_repdata = NULL;
528 request->rq_repmsg = NULL;
531 rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/
532 connection->c_peer, request->rq_xid, 0,
533 LNET_UNLINK, LNET_INS_AFTER, &reply_me_h);
535 CERROR("LNetMEAttach failed: %d\n", rc);
536 LASSERT (rc == -ENOMEM);
537 GOTO(cleanup_bulk, rc = -ENOMEM);
541 spin_lock(&request->rq_lock);
542 /* If the MD attach succeeds, there _will_ be a reply_in callback */
543 request->rq_receiving_reply = !noreply;
544 /* We are responsible for unlinking the reply buffer */
545 request->rq_must_unlink = !noreply;
546 /* Clear any flags that may be present from previous sends. */
547 request->rq_replied = 0;
549 request->rq_timedout = 0;
550 request->rq_net_err = 0;
551 request->rq_resend = 0;
552 request->rq_restart = 0;
553 spin_unlock(&request->rq_lock);
556 reply_md.start = request->rq_repbuf;
557 reply_md.length = request->rq_repbuf_len;
558 /* Allow multiple early replies */
559 reply_md.threshold = LNET_MD_THRESH_INF;
560 /* Manage remote for early replies */
561 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
562 LNET_MD_MANAGE_REMOTE;
563 reply_md.user_ptr = &request->rq_reply_cbid;
564 reply_md.eq_handle = ptlrpc_eq_h;
566 /* We must see the unlink callback to unset rq_must_unlink,
567 so we can't auto-unlink */
568 rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN,
569 &request->rq_reply_md_h);
571 CERROR("LNetMDAttach failed: %d\n", rc);
572 LASSERT (rc == -ENOMEM);
573 spin_lock(&request->rq_lock);
574 /* ...but the MD attach didn't succeed... */
575 request->rq_receiving_reply = 0;
576 spin_unlock(&request->rq_lock);
577 GOTO(cleanup_me, rc = -ENOMEM);
580 CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid "LPU64
582 request->rq_repbuf_len, request->rq_xid,
583 request->rq_reply_portal);
586 /* add references on request for request_out_callback */
587 ptlrpc_request_addref(request);
588 if (obd->obd_svc_stats != NULL)
589 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
590 request->rq_import->imp_inflight.counter);
592 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
594 do_gettimeofday(&request->rq_arrival_time);
595 request->rq_sent = cfs_time_current_sec();
596 /* We give the server rq_timeout secs to process the req, and
597 add the network latency for our local timeout. */
598 request->rq_deadline = request->rq_sent + request->rq_timeout +
599 ptlrpc_at_get_net_latency(request);
601 ptlrpc_pinger_sending_on_import(request->rq_import);
603 DEBUG_REQ(D_INFO, request, "send flg=%x",
604 lustre_msg_get_flags(request->rq_reqmsg));
605 rc = ptl_send_buf(&request->rq_req_md_h,
606 request->rq_reqbuf, request->rq_reqdata_len,
607 LNET_NOACK_REQ, &request->rq_req_cbid,
609 request->rq_request_portal,
612 ptlrpc_lprocfs_rpc_sent(request);
616 ptlrpc_req_finished(request);
621 /* MEUnlink is safe; the PUT didn't even get off the ground, and
622 * nobody apart from the PUT's target has the right nid+XID to
623 * access the reply buffer. */
624 rc2 = LNetMEUnlink(reply_me_h);
626 /* UNLINKED callback called synchronously */
627 LASSERT (!request->rq_receiving_reply);
630 if (request->rq_bulk != NULL)
631 ptlrpc_unregister_bulk(request);
636 int ptlrpc_register_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
638 struct ptlrpc_service *service = rqbd->rqbd_service;
639 static lnet_process_id_t match_id = {LNET_NID_ANY, LNET_PID_ANY};
642 lnet_handle_me_t me_h;
644 CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
645 service->srv_req_portal);
647 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
650 rc = LNetMEAttach(service->srv_req_portal,
651 match_id, 0, ~0, LNET_UNLINK, LNET_INS_AFTER, &me_h);
653 CERROR("LNetMEAttach failed: %d\n", rc);
657 LASSERT(rqbd->rqbd_refcount == 0);
658 rqbd->rqbd_refcount = 1;
660 md.start = rqbd->rqbd_buffer;
661 md.length = service->srv_buf_size;
662 md.max_size = service->srv_max_req_size;
663 md.threshold = LNET_MD_THRESH_INF;
664 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
665 md.user_ptr = &rqbd->rqbd_cbid;
666 md.eq_handle = ptlrpc_eq_h;
668 rc = LNetMDAttach(me_h, md, LNET_UNLINK, &rqbd->rqbd_md_h);
672 CERROR("LNetMDAttach failed: %d; \n", rc);
673 LASSERT (rc == -ENOMEM);
674 rc = LNetMEUnlink (me_h);
676 rqbd->rqbd_refcount = 0;