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