lustre/ptlrpc/events.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of the Lustre file system, http://www.lustre.org
   7  *   Lustre is a trademark of Cluster File Systems, Inc.
   8  *
   9  *   You may have signed or agreed to another license before downloading
  10  *   this software.  If so, you are bound by the terms and conditions
  11  *   of that agreement, and the following does not apply to you.  See the
  12  *   LICENSE file included with this distribution for more information.
  13  *
  14  *   If you did not agree to a different license, then this copy of Lustre
  15  *   is open source software; you can redistribute it and/or modify it
  16  *   under the terms of version 2 of the GNU General Public License as
  17  *   published by the Free Software Foundation.
  18  *
  19  *   In either case, Lustre is distributed in the hope that it will be
  20  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  21  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   license text for more details.
  23  *
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_RPC
  27
  28 #ifndef __KERNEL__
  29 # include <liblustre.h>
  30 #else
  31 # ifdef __mips64__
  32 #  include <linux/kernel.h>
  33 # endif
  34 #endif
  35 #include <obd_class.h>
  36 #include <lustre_net.h>
  37 #include "ptlrpc_internal.h"
  38
  39 lnet_handle_eq_t   ptlrpc_eq_h;
  40
  41 /*
  42  *  Client's outgoing request callback
  43  */
  44 void request_out_callback(lnet_event_t *ev)
  45 {
  46         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  47         struct ptlrpc_request *req = cbid->cbid_arg;
  48         ENTRY;
  49
  50         LASSERT (ev->type == LNET_EVENT_SEND ||
  51                  ev->type == LNET_EVENT_UNLINK);
  52         LASSERT (ev->unlinked);
  53
  54         DEBUG_REQ((ev->status == 0) ? D_NET : D_ERROR, req,
  55                   "type %d, status %d", ev->type, ev->status);
  56
  57         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  58
  59                 /* Failed send: make it seem like the reply timed out, just
  60                  * like failing sends in client.c does currently...  */
  61
  62                 spin_lock(&req->rq_lock);
  63                 req->rq_net_err = 1;
  64                 spin_unlock(&req->rq_lock);
  65
  66                 ptlrpc_wake_client_req(req);
  67         }
  68
  69         /* these balance the references in ptl_send_rpc() */
  70         atomic_dec(&req->rq_import->imp_inflight);
  71         ptlrpc_req_finished(req);
  72
  73         EXIT;
  74 }
  75
  76 /*
  77  * Client's incoming reply callback
  78  */
  79 void reply_in_callback(lnet_event_t *ev)
  80 {
  81         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  82         struct ptlrpc_request *req = cbid->cbid_arg;
  83         ENTRY;
  84
  85         LASSERT (ev->type == LNET_EVENT_PUT ||
  86                  ev->type == LNET_EVENT_UNLINK);
  87         LASSERT (ev->unlinked);
  88         LASSERT (ev->md.start == req->rq_repmsg);
  89         LASSERT (ev->offset == 0);
  90         LASSERT (ev->mlength <= req->rq_replen);
  91
  92         DEBUG_REQ((ev->status == 0) ? D_NET : D_ERROR, req,
  93                   "type %d, status %d", ev->type, ev->status);
  94
  95         spin_lock(&req->rq_lock);
  96
  97         LASSERT (req->rq_receiving_reply);
  98         req->rq_receiving_reply = 0;
  99
 100         if (ev->type == LNET_EVENT_PUT && ev->status == 0) {
 101                 req->rq_replied = 1;
 102                 req->rq_nob_received = ev->mlength;
 103         }
 104
 105         /* NB don't unlock till after wakeup; req can disappear under us
 106          * since we don't have our own ref */
 107         ptlrpc_wake_client_req(req);
 108
 109         spin_unlock(&req->rq_lock);
 110         EXIT;
 111 }
 112
 113 /*
 114  * Client's bulk has been written/read
 115  */
 116 void client_bulk_callback (lnet_event_t *ev)
 117 {
 118         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 119         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 120         ENTRY;
 121
 122         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB))
 123                 ev->status = -EIO;
 124
 125         LASSERT ((desc->bd_type == BULK_PUT_SINK &&
 126                   ev->type == LNET_EVENT_PUT) ||
 127                  (desc->bd_type == BULK_GET_SOURCE &&
 128                   ev->type == LNET_EVENT_GET) ||
 129                  ev->type == LNET_EVENT_UNLINK);
 130         LASSERT (ev->unlinked);
 131
 132         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 133                "event type %d, status %d, desc %p\n",
 134                ev->type, ev->status, desc);
 135
 136         spin_lock(&desc->bd_lock);
 137
 138         LASSERT(desc->bd_network_rw);
 139         desc->bd_network_rw = 0;
 140
 141         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 142                 desc->bd_success = 1;
 143                 desc->bd_nob_transferred = ev->mlength;
 144                 desc->bd_sender = ev->sender;
 145         }
 146
 147         /* NB don't unlock till after wakeup; desc can disappear under us
 148          * otherwise */
 149         ptlrpc_wake_client_req(desc->bd_req);
 150
 151         spin_unlock(&desc->bd_lock);
 152         EXIT;
 153 }
 154
 155 /*
 156  * Server's incoming request callback
 157  */
 158 void request_in_callback(lnet_event_t *ev)
 159 {
 160         struct ptlrpc_cb_id               *cbid = ev->md.user_ptr;
 161         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 162         struct ptlrpc_service             *service = rqbd->rqbd_service;
 163         struct ptlrpc_request             *req;
 164         ENTRY;
 165
 166         LASSERT (ev->type == LNET_EVENT_PUT ||
 167                  ev->type == LNET_EVENT_UNLINK);
 168         LASSERT ((char *)ev->md.start >= rqbd->rqbd_buffer);
 169         LASSERT ((char *)ev->md.start + ev->offset + ev->mlength <=
 170                  rqbd->rqbd_buffer + service->srv_buf_size);
 171
 172         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 173                "event type %d, status %d, service %s\n",
 174                ev->type, ev->status, service->srv_name);
 175
 176         if (ev->unlinked) {
 177                 /* If this is the last request message to fit in the
 178                  * request buffer we can use the request object embedded in
 179                  * rqbd.  Note that if we failed to allocate a request,
 180                  * we'd have to re-post the rqbd, which we can't do in this
 181                  * context. */
 182                 req = &rqbd->rqbd_req;
 183                 memset(req, 0, sizeof (*req));
 184         } else {
 185                 LASSERT (ev->type == LNET_EVENT_PUT);
 186                 if (ev->status != 0) {
 187                         /* We moaned above already... */
 188                         return;
 189                 }
 190                 OBD_ALLOC_GFP(req, sizeof(*req), CFS_ALLOC_ATOMIC_TRY);
 191                 if (req == NULL) {
 192                         CERROR("Can't allocate incoming request descriptor: "
 193                                "Dropping %s RPC from %s\n",
 194                                service->srv_name,
 195                                libcfs_id2str(ev->initiator));
 196                         return;
 197                 }
 198         }
 199
 200         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 201          * flags are reset and scalars are zero.  We only set the message
 202          * size to non-zero if this was a successful receive. */
 203         req->rq_xid = ev->match_bits;
 204         req->rq_reqmsg = ev->md.start + ev->offset;
 205         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 206                 req->rq_reqlen = ev->mlength;
 207         do_gettimeofday(&req->rq_arrival_time);
 208         req->rq_peer = ev->initiator;
 209         req->rq_self = ev->target.nid;
 210         req->rq_rqbd = rqbd;
 211         req->rq_phase = RQ_PHASE_NEW;
 212 #ifdef CRAY_XT3
 213         req->rq_uid = ev->uid;
 214 #endif
 215
 216         spin_lock(&service->srv_lock);
 217
 218         req->rq_history_seq = service->srv_request_seq++;
 219         list_add_tail(&req->rq_history_list, &service->srv_request_history);
 220
 221         if (ev->unlinked) {
 222                 service->srv_nrqbd_receiving--;
 223                 CDEBUG(D_RPCTRACE,"Buffer complete: %d buffers still posted\n",
 224                        service->srv_nrqbd_receiving);
 225
 226                 /* Normally, don't complain about 0 buffers posted; LNET won't
 227                  * drop incoming reqs since we set the portal lazy */
 228                 if (test_req_buffer_pressure &&
 229                     ev->type != LNET_EVENT_UNLINK &&
 230                     service->srv_nrqbd_receiving == 0)
 231                         CWARN("All %s request buffers busy\n",
 232                               service->srv_name);
 233
 234                 /* req takes over the network's ref on rqbd */
 235         } else {
 236                 /* req takes a ref on rqbd */
 237                 rqbd->rqbd_refcount++;
 238         }
 239
 240         list_add_tail(&req->rq_list, &service->srv_request_queue);
 241         service->srv_n_queued_reqs++;
 242
 243         /* NB everything can disappear under us once the request
 244          * has been queued and we unlock, so do the wake now... */
 245         cfs_waitq_signal(&service->srv_waitq);
 246
 247         spin_unlock(&service->srv_lock);
 248         EXIT;
 249 }
 250
 251 /*
 252  *  Server's outgoing reply callback
 253  */
 254 void reply_out_callback(lnet_event_t *ev)
 255 {
 256         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 257         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 258         struct ptlrpc_service     *svc = rs->rs_service;
 259         ENTRY;
 260
 261         LASSERT (ev->type == LNET_EVENT_SEND ||
 262                  ev->type == LNET_EVENT_ACK ||
 263                  ev->type == LNET_EVENT_UNLINK);
 264
 265         if (!rs->rs_difficult) {
 266                 /* 'Easy' replies have no further processing so I drop the
 267                  * net's ref on 'rs' */
 268                 LASSERT (ev->unlinked);
 269                 ptlrpc_rs_decref(rs);
 270                 atomic_dec (&svc->srv_outstanding_replies);
 271                 EXIT;
 272                 return;
 273         }
 274
 275         LASSERT (rs->rs_on_net);
 276
 277         if (ev->unlinked) {
 278                 /* Last network callback.  The net's ref on 'rs' stays put
 279                  * until ptlrpc_server_handle_reply() is done with it */
 280                 spin_lock(&svc->srv_lock);
 281                 rs->rs_on_net = 0;
 282                 ptlrpc_schedule_difficult_reply (rs);
 283                 spin_unlock(&svc->srv_lock);
 284         }
 285
 286         EXIT;
 287 }
 288
 289 /*
 290  * Server's bulk completion callback
 291  */
 292 void server_bulk_callback (lnet_event_t *ev)
 293 {
 294         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 295         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 296         ENTRY;
 297
 298         LASSERT (ev->type == LNET_EVENT_SEND ||
 299                  ev->type == LNET_EVENT_UNLINK ||
 300                  (desc->bd_type == BULK_PUT_SOURCE &&
 301                   ev->type == LNET_EVENT_ACK) ||
 302                  (desc->bd_type == BULK_GET_SINK &&
 303                   ev->type == LNET_EVENT_REPLY));
 304
 305         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 306                "event type %d, status %d, desc %p\n",
 307                ev->type, ev->status, desc);
 308
 309         spin_lock(&desc->bd_lock);
 310
 311         if ((ev->type == LNET_EVENT_ACK ||
 312              ev->type == LNET_EVENT_REPLY) &&
 313             ev->status == 0) {
 314                 /* We heard back from the peer, so even if we get this
 315                  * before the SENT event (oh yes we can), we know we
 316                  * read/wrote the peer buffer and how much... */
 317                 desc->bd_success = 1;
 318                 desc->bd_nob_transferred = ev->mlength;
 319                 desc->bd_sender = ev->sender;
 320         }
 321
 322         if (ev->unlinked) {
 323                 /* This is the last callback no matter what... */
 324                 desc->bd_network_rw = 0;
 325                 cfs_waitq_signal(&desc->bd_waitq);
 326         }
 327
 328         spin_unlock(&desc->bd_lock);
 329         EXIT;
 330 }
 331
 332 static void ptlrpc_master_callback(lnet_event_t *ev)
 333 {
 334         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 335         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 336
 337         /* Honestly, it's best to find out early. */
 338         LASSERT (cbid->cbid_arg != LP_POISON);
 339         LASSERT (callback == request_out_callback ||
 340                  callback == reply_in_callback ||
 341                  callback == client_bulk_callback ||
 342                  callback == request_in_callback ||
 343                  callback == reply_out_callback ||
 344                  callback == server_bulk_callback);
 345
 346         callback (ev);
 347 }
 348
 349 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 350                          lnet_process_id_t *peer, lnet_nid_t *self)
 351 {
 352         int               best_dist = 0;
 353         int               best_order = 0;
 354         int               count = 0;
 355         int               rc = -ENOENT;
 356         int               portals_compatibility;
 357         int               dist;
 358         int               order;
 359         lnet_nid_t        dst_nid;
 360         lnet_nid_t        src_nid;
 361
 362         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 363
 364         peer->pid = LUSTRE_SRV_LNET_PID;
 365
 366         /* Choose the matching UUID that's closest */
 367         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 368                 dist = LNetDist(dst_nid, &src_nid, &order);
 369                 if (dist < 0)
 370                         continue;
 371
 372                 if (dist == 0) {                /* local! use loopback LND */
 373                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 374                         rc = 0;
 375                         break;
 376                 }
 377
 378                 LASSERT (order >= 0);
 379                 if (rc < 0 ||
 380                     dist < best_dist ||
 381                     (dist == best_dist && order < best_order)) {
 382                         best_dist = dist;
 383                         best_order = order;
 384
 385                         if (portals_compatibility > 1) {
 386                                 /* Strong portals compatibility: Zero the nid's
 387                                  * NET, so if I'm reading new config logs, or
 388                                  * getting configured by (new) lconf I can
 389                                  * still talk to old servers. */
 390                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 391                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 392                         }
 393                         peer->nid = dst_nid;
 394                         *self = src_nid;
 395                         rc = 0;
 396                 }
 397         }
 398
 399         CDEBUG(D_NET,"%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 400         if (rc != 0)
 401                 CERROR("No NID found for %s\n", uuid->uuid);
 402         return rc;
 403 }
 404
 405 void ptlrpc_ni_fini(void)
 406 {
 407         cfs_waitq_t         waitq;
 408         struct l_wait_info  lwi;
 409         int                 rc;
 410         int                 retries;
 411
 412         /* Wait for the event queue to become idle since there may still be
 413          * messages in flight with pending events (i.e. the fire-and-forget
 414          * messages == client requests and "non-difficult" server
 415          * replies */
 416
 417         for (retries = 0;; retries++) {
 418                 rc = LNetEQFree(ptlrpc_eq_h);
 419                 switch (rc) {
 420                 default:
 421                         LBUG();
 422
 423                 case 0:
 424                         LNetNIFini();
 425                         return;
 426
 427                 case -EBUSY:
 428                         if (retries != 0)
 429                                 CWARN("Event queue still busy\n");
 430
 431                         /* Wait for a bit */
 432                         cfs_waitq_init(&waitq);
 433                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 434                         l_wait_event(waitq, 0, &lwi);
 435                         break;
 436                 }
 437         }
 438         /* notreached */
 439 }
 440
 441 lnet_pid_t ptl_get_pid(void)
 442 {
 443         lnet_pid_t        pid;
 444
 445 #ifndef  __KERNEL__
 446         pid = getpid();
 447 #else
 448         pid = LUSTRE_SRV_LNET_PID;
 449 #endif
 450         return pid;
 451 }
 452
 453 int ptlrpc_ni_init(void)
 454 {
 455         int              rc;
 456         lnet_pid_t       pid;
 457
 458         pid = ptl_get_pid();
 459         CDEBUG(D_NET, "My pid is: %x\n", pid);
 460
 461         /* We're not passing any limits yet... */
 462         rc = LNetNIInit(pid);
 463         if (rc < 0) {
 464                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 465                 return (-ENOENT);
 466         }
 467
 468         /* CAVEAT EMPTOR: how we process portals events is _radically_
 469          * different depending on... */
 470 #ifdef __KERNEL__
 471         /* kernel portals calls our master callback when events are added to
 472          * the event queue.  In fact lustre never pulls events off this queue,
 473          * so it's only sized for some debug history. */
 474         rc = LNetEQAlloc(1024, ptlrpc_master_callback, &ptlrpc_eq_h);
 475 #else
 476         /* liblustre calls the master callback when it removes events from the
 477          * event queue.  The event queue has to be big enough not to drop
 478          * anything */
 479         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &ptlrpc_eq_h);
 480 #endif
 481         if (rc == 0)
 482                 return 0;
 483
 484         CERROR ("Failed to allocate event queue: %d\n", rc);
 485         LNetNIFini();
 486
 487         return (-ENOMEM);
 488 }
 489
 490 #ifndef __KERNEL__
 491 CFS_LIST_HEAD(liblustre_wait_callbacks);
 492 CFS_LIST_HEAD(liblustre_idle_callbacks);
 493 void *liblustre_services_callback;
 494
 495 void *
 496 liblustre_register_waitidle_callback (struct list_head *callback_list,
 497                                       const char *name,
 498                                       int (*fn)(void *arg), void *arg)
 499 {
 500         struct liblustre_wait_callback *llwc;
 501
 502         OBD_ALLOC(llwc, sizeof(*llwc));
 503         LASSERT (llwc != NULL);
 504
 505         llwc->llwc_name = name;
 506         llwc->llwc_fn = fn;
 507         llwc->llwc_arg = arg;
 508         list_add_tail(&llwc->llwc_list, callback_list);
 509
 510         return (llwc);
 511 }
 512
 513 void
 514 liblustre_deregister_waitidle_callback (void *opaque)
 515 {
 516         struct liblustre_wait_callback *llwc = opaque;
 517
 518         list_del(&llwc->llwc_list);
 519         OBD_FREE(llwc, sizeof(*llwc));
 520 }
 521
 522 void *
 523 liblustre_register_wait_callback (const char *name,
 524                                   int (*fn)(void *arg), void *arg)
 525 {
 526         return liblustre_register_waitidle_callback(&liblustre_wait_callbacks,
 527                                                     name, fn, arg);
 528 }
 529
 530 void
 531 liblustre_deregister_wait_callback (void *opaque)
 532 {
 533         liblustre_deregister_waitidle_callback(opaque);
 534 }
 535
 536 void *
 537 liblustre_register_idle_callback (const char *name,
 538                                   int (*fn)(void *arg), void *arg)
 539 {
 540         return liblustre_register_waitidle_callback(&liblustre_idle_callbacks,
 541                                                     name, fn, arg);
 542 }
 543
 544 void
 545 liblustre_deregister_idle_callback (void *opaque)
 546 {
 547         liblustre_deregister_waitidle_callback(opaque);
 548 }
 549
 550 int
 551 liblustre_check_events (int timeout)
 552 {
 553         lnet_event_t ev;
 554         int         rc;
 555         int         i;
 556         ENTRY;
 557
 558         rc = LNetEQPoll(&ptlrpc_eq_h, 1, timeout * 1000, &ev, &i);
 559         if (rc == 0)
 560                 RETURN(0);
 561
 562         LASSERT (rc == -EOVERFLOW || rc == 1);
 563
 564         /* liblustre: no asynch callback so we can't affort to miss any
 565          * events... */
 566         if (rc == -EOVERFLOW) {
 567                 CERROR ("Dropped an event!!!\n");
 568                 abort();
 569         }
 570
 571         ptlrpc_master_callback (&ev);
 572         RETURN(1);
 573 }
 574
 575 int liblustre_waiting = 0;
 576
 577 int
 578 liblustre_wait_event (int timeout)
 579 {
 580         struct list_head               *tmp;
 581         struct liblustre_wait_callback *llwc;
 582         int                             found_something = 0;
 583
 584         /* single threaded recursion check... */
 585         liblustre_waiting = 1;
 586
 587         for (;;) {
 588                 /* Deal with all pending events */
 589                 while (liblustre_check_events(0))
 590                         found_something = 1;
 591
 592                 /* Give all registered callbacks a bite at the cherry */
 593                 list_for_each(tmp, &liblustre_wait_callbacks) {
 594                         llwc = list_entry(tmp, struct liblustre_wait_callback,
 595                                           llwc_list);
 596
 597                         if (llwc->llwc_fn(llwc->llwc_arg))
 598                                 found_something = 1;
 599                 }
 600
 601                 if (found_something || timeout == 0)
 602                         break;
 603
 604                 /* Nothing so far, but I'm allowed to block... */
 605                 found_something = liblustre_check_events(timeout);
 606                 if (!found_something)           /* still nothing */
 607                         break;                  /* I timed out */
 608         }
 609
 610         liblustre_waiting = 0;
 611
 612         return found_something;
 613 }
 614
 615 void
 616 liblustre_wait_idle(void)
 617 {
 618         static int recursed = 0;
 619
 620         struct list_head               *tmp;
 621         struct liblustre_wait_callback *llwc;
 622         int                             idle = 0;
 623
 624         LASSERT(!recursed);
 625         recursed = 1;
 626
 627         do {
 628                 liblustre_wait_event(0);
 629
 630                 idle = 1;
 631
 632                 list_for_each(tmp, &liblustre_idle_callbacks) {
 633                         llwc = list_entry(tmp, struct liblustre_wait_callback,
 634                                           llwc_list);
 635
 636                         if (!llwc->llwc_fn(llwc->llwc_arg)) {
 637                                 idle = 0;
 638                                 break;
 639                         }
 640                 }
 641
 642         } while (!idle);
 643
 644         recursed = 0;
 645 }
 646
 647 #endif /* __KERNEL__ */
 648
 649 int ptlrpc_init_portals(void)
 650 {
 651         int   rc = ptlrpc_ni_init();
 652
 653         if (rc != 0) {
 654                 CERROR("network initialisation failed\n");
 655                 return -EIO;
 656         }
 657 #ifndef __KERNEL__
 658         liblustre_services_callback =
 659                 liblustre_register_wait_callback("liblustre_check_services",
 660                                                  &liblustre_check_services, NULL);
 661 #endif
 662         rc = ptlrpcd_addref();
 663         if (rc == 0)
 664                 return 0;
 665
 666         CERROR("rpcd initialisation failed\n");
 667 #ifndef __KERNEL__
 668         liblustre_deregister_wait_callback(liblustre_services_callback);
 669 #endif
 670         ptlrpc_ni_fini();
 671         return rc;
 672 }
 673
 674 void ptlrpc_exit_portals(void)
 675 {
 676 #ifndef __KERNEL__
 677         liblustre_deregister_wait_callback(liblustre_services_callback);
 678 #endif
 679         ptlrpcd_decref();
 680         ptlrpc_ni_fini();
 681 }