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 <lustre_sec.h>
  38 #include "ptlrpc_internal.h"
  39
  40 lnet_handle_eq_t   ptlrpc_eq_h;
  41
  42 /*
  43  *  Client's outgoing request callback
  44  */
  45 void request_out_callback(lnet_event_t *ev)
  46 {
  47         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  48         struct ptlrpc_request *req = cbid->cbid_arg;
  49         ENTRY;
  50
  51         LASSERT (ev->type == LNET_EVENT_SEND ||
  52                  ev->type == LNET_EVENT_UNLINK);
  53         LASSERT (ev->unlinked);
  54
  55         DEBUG_REQ((ev->status == 0) ? D_NET : D_ERROR, req,
  56                   "type %d, status %d", ev->type, ev->status);
  57
  58         sptlrpc_request_out_callback(req);
  59
  60         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  61
  62                 /* Failed send: make it seem like the reply timed out, just
  63                  * like failing sends in client.c does currently...  */
  64
  65                 spin_lock(&req->rq_lock);
  66                 req->rq_net_err = 1;
  67                 spin_unlock(&req->rq_lock);
  68
  69                 ptlrpc_wake_client_req(req);
  70         }
  71
  72         ptlrpc_req_finished(req);
  73
  74         EXIT;
  75 }
  76
  77 /*
  78  * Client's incoming reply callback
  79  */
  80 void reply_in_callback(lnet_event_t *ev)
  81 {
  82         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  83         struct ptlrpc_request *req = cbid->cbid_arg;
  84         ENTRY;
  85
  86         LASSERT (ev->type == LNET_EVENT_PUT ||
  87                  ev->type == LNET_EVENT_UNLINK);
  88         LASSERT (ev->unlinked);
  89         LASSERT (ev->md.start == req->rq_repbuf);
  90         LASSERT (ev->offset == 0);
  91         LASSERT (ev->mlength <= req->rq_repbuf_len);
  92
  93         DEBUG_REQ((ev->status == 0) ? D_NET : D_ERROR, req,
  94                   "type %d, status %d", ev->type, ev->status);
  95
  96         spin_lock(&req->rq_lock);
  97
  98         LASSERT (req->rq_receiving_reply);
  99         req->rq_receiving_reply = 0;
 100
 101         if (ev->type == LNET_EVENT_PUT && ev->status == 0) {
 102                 req->rq_replied = 1;
 103                 req->rq_nob_received = ev->mlength;
 104         }
 105
 106         /* NB don't unlock till after wakeup; req can disappear under us
 107          * since we don't have our own ref */
 108         ptlrpc_wake_client_req(req);
 109
 110         spin_unlock(&req->rq_lock);
 111         EXIT;
 112 }
 113
 114 /*
 115  * Client's bulk has been written/read
 116  */
 117 void client_bulk_callback (lnet_event_t *ev)
 118 {
 119         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 120         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 121         ENTRY;
 122
 123         LASSERT ((desc->bd_type == BULK_PUT_SINK &&
 124                   ev->type == LNET_EVENT_PUT) ||
 125                  (desc->bd_type == BULK_GET_SOURCE &&
 126                   ev->type == LNET_EVENT_GET) ||
 127                  ev->type == LNET_EVENT_UNLINK);
 128         LASSERT (ev->unlinked);
 129
 130         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 131                "event type %d, status %d, desc %p\n",
 132                ev->type, ev->status, desc);
 133
 134         spin_lock(&desc->bd_lock);
 135
 136         LASSERT(desc->bd_network_rw);
 137         desc->bd_network_rw = 0;
 138
 139         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 140                 desc->bd_success = 1;
 141                 desc->bd_nob_transferred = ev->mlength;
 142                 desc->bd_sender = ev->sender;
 143         }
 144
 145         sptlrpc_enc_pool_put_pages(desc);
 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_reqbuf = ev->md.start + ev->offset;
 205         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 206                 req->rq_reqdata_len = 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         CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
 217
 218         spin_lock(&service->srv_lock);
 219
 220         req->rq_history_seq = service->srv_request_seq++;
 221         list_add_tail(&req->rq_history_list, &service->srv_request_history);
 222
 223         if (ev->unlinked) {
 224                 service->srv_nrqbd_receiving--;
 225                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 226                        service->srv_nrqbd_receiving);
 227
 228                 /* Normally, don't complain about 0 buffers posted; LNET won't
 229                  * drop incoming reqs since we set the portal lazy */
 230                 if (test_req_buffer_pressure &&
 231                     ev->type != LNET_EVENT_UNLINK &&
 232                     service->srv_nrqbd_receiving == 0)
 233                         CWARN("All %s request buffers busy\n",
 234                               service->srv_name);
 235
 236                 /* req takes over the network's ref on rqbd */
 237         } else {
 238                 /* req takes a ref on rqbd */
 239                 rqbd->rqbd_refcount++;
 240         }
 241
 242         list_add_tail(&req->rq_list, &service->srv_request_queue);
 243         service->srv_n_queued_reqs++;
 244
 245         /* NB everything can disappear under us once the request
 246          * has been queued and we unlock, so do the wake now... */
 247         cfs_waitq_signal(&service->srv_waitq);
 248
 249         spin_unlock(&service->srv_lock);
 250         EXIT;
 251 }
 252
 253 /*
 254  *  Server's outgoing reply callback
 255  */
 256 void reply_out_callback(lnet_event_t *ev)
 257 {
 258         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 259         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 260         struct ptlrpc_service     *svc = rs->rs_service;
 261         ENTRY;
 262
 263         LASSERT (ev->type == LNET_EVENT_SEND ||
 264                  ev->type == LNET_EVENT_ACK ||
 265                  ev->type == LNET_EVENT_UNLINK);
 266
 267         if (!rs->rs_difficult) {
 268                 /* 'Easy' replies have no further processing so I drop the
 269                  * net's ref on 'rs' */
 270                 LASSERT (ev->unlinked);
 271                 ptlrpc_rs_decref(rs);
 272                 atomic_dec (&svc->srv_outstanding_replies);
 273                 EXIT;
 274                 return;
 275         }
 276
 277         LASSERT (rs->rs_on_net);
 278
 279         if (ev->unlinked) {
 280                 /* Last network callback.  The net's ref on 'rs' stays put
 281                  * until ptlrpc_server_handle_reply() is done with it */
 282                 spin_lock(&svc->srv_lock);
 283                 rs->rs_on_net = 0;
 284                 ptlrpc_schedule_difficult_reply (rs);
 285                 spin_unlock(&svc->srv_lock);
 286         }
 287
 288         EXIT;
 289 }
 290
 291 /*
 292  * Server's bulk completion callback
 293  */
 294 void server_bulk_callback (lnet_event_t *ev)
 295 {
 296         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 297         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 298         ENTRY;
 299
 300         LASSERT (ev->type == LNET_EVENT_SEND ||
 301                  ev->type == LNET_EVENT_UNLINK ||
 302                  (desc->bd_type == BULK_PUT_SOURCE &&
 303                   ev->type == LNET_EVENT_ACK) ||
 304                  (desc->bd_type == BULK_GET_SINK &&
 305                   ev->type == LNET_EVENT_REPLY));
 306
 307         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 308                "event type %d, status %d, desc %p\n",
 309                ev->type, ev->status, desc);
 310
 311         spin_lock(&desc->bd_lock);
 312
 313         if ((ev->type == LNET_EVENT_ACK ||
 314              ev->type == LNET_EVENT_REPLY) &&
 315             ev->status == 0) {
 316                 /* We heard back from the peer, so even if we get this
 317                  * before the SENT event (oh yes we can), we know we
 318                  * read/wrote the peer buffer and how much... */
 319                 desc->bd_success = 1;
 320                 desc->bd_nob_transferred = ev->mlength;
 321                 desc->bd_sender = ev->sender;
 322         }
 323
 324         if (ev->unlinked) {
 325                 /* This is the last callback no matter what... */
 326                 desc->bd_network_rw = 0;
 327                 cfs_waitq_signal(&desc->bd_waitq);
 328         }
 329
 330         spin_unlock(&desc->bd_lock);
 331         EXIT;
 332 }
 333
 334 static void ptlrpc_master_callback(lnet_event_t *ev)
 335 {
 336         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 337         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 338
 339         /* Honestly, it's best to find out early. */
 340         LASSERT (cbid->cbid_arg != LP_POISON);
 341         LASSERT (callback == request_out_callback ||
 342                  callback == reply_in_callback ||
 343                  callback == client_bulk_callback ||
 344                  callback == request_in_callback ||
 345                  callback == reply_out_callback ||
 346                  callback == server_bulk_callback);
 347
 348         callback (ev);
 349 }
 350
 351 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 352                          lnet_process_id_t *peer, lnet_nid_t *self)
 353 {
 354         int               best_dist = 0;
 355         __u32             best_order = 0;
 356         int               count = 0;
 357         int               rc = -ENOENT;
 358         int               portals_compatibility;
 359         int               dist;
 360         __u32             order;
 361         lnet_nid_t        dst_nid;
 362         lnet_nid_t        src_nid;
 363
 364         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 365
 366         peer->pid = LUSTRE_SRV_LNET_PID;
 367
 368         /* Choose the matching UUID that's closest */
 369         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 370                 dist = LNetDist(dst_nid, &src_nid, &order);
 371                 if (dist < 0)
 372                         continue;
 373
 374                 if (dist == 0) {                /* local! use loopback LND */
 375                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 376                         rc = 0;
 377                         break;
 378                 }
 379
 380                 if (rc < 0 ||
 381                     dist < best_dist ||
 382                     (dist == best_dist && order < best_order)) {
 383                         best_dist = dist;
 384                         best_order = order;
 385
 386                         if (portals_compatibility > 1) {
 387                                 /* Strong portals compatibility: Zero the nid's
 388                                  * NET, so if I'm reading new config logs, or
 389                                  * getting configured by (new) lconf I can
 390                                  * still talk to old servers. */
 391                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 392                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 393                         }
 394                         peer->nid = dst_nid;
 395                         *self = src_nid;
 396                         rc = 0;
 397                 }
 398         }
 399
 400         CDEBUG(D_NET,"%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 401         if (rc != 0)
 402                 CERROR("No NID found for %s\n", uuid->uuid);
 403         return rc;
 404 }
 405
 406 void ptlrpc_ni_fini(void)
 407 {
 408         cfs_waitq_t         waitq;
 409         struct l_wait_info  lwi;
 410         int                 rc;
 411         int                 retries;
 412
 413         /* Wait for the event queue to become idle since there may still be
 414          * messages in flight with pending events (i.e. the fire-and-forget
 415          * messages == client requests and "non-difficult" server
 416          * replies */
 417
 418         for (retries = 0;; retries++) {
 419                 rc = LNetEQFree(ptlrpc_eq_h);
 420                 switch (rc) {
 421                 default:
 422                         LBUG();
 423
 424                 case 0:
 425                         LNetNIFini();
 426                         return;
 427
 428                 case -EBUSY:
 429                         if (retries != 0)
 430                                 CWARN("Event queue still busy\n");
 431
 432                         /* Wait for a bit */
 433                         cfs_waitq_init(&waitq);
 434                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 435                         l_wait_event(waitq, 0, &lwi);
 436                         break;
 437                 }
 438         }
 439         /* notreached */
 440 }
 441
 442 lnet_pid_t ptl_get_pid(void)
 443 {
 444         lnet_pid_t        pid;
 445
 446 #ifndef  __KERNEL__
 447         pid = getpid();
 448 #else
 449         pid = LUSTRE_SRV_LNET_PID;
 450 #endif
 451         return pid;
 452 }
 453
 454 int ptlrpc_ni_init(void)
 455 {
 456         int              rc;
 457         lnet_pid_t       pid;
 458
 459         pid = ptl_get_pid();
 460         CDEBUG(D_NET, "My pid is: %x\n", pid);
 461
 462         /* We're not passing any limits yet... */
 463         rc = LNetNIInit(pid);
 464         if (rc < 0) {
 465                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 466                 return (-ENOENT);
 467         }
 468
 469         /* CAVEAT EMPTOR: how we process portals events is _radically_
 470          * different depending on... */
 471 #ifdef __KERNEL__
 472         /* kernel portals calls our master callback when events are added to
 473          * the event queue.  In fact lustre never pulls events off this queue,
 474          * so it's only sized for some debug history. */
 475         rc = LNetEQAlloc(1024, ptlrpc_master_callback, &ptlrpc_eq_h);
 476 #else
 477         /* liblustre calls the master callback when it removes events from the
 478          * event queue.  The event queue has to be big enough not to drop
 479          * anything */
 480         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &ptlrpc_eq_h);
 481 #endif
 482         if (rc == 0)
 483                 return 0;
 484
 485         CERROR ("Failed to allocate event queue: %d\n", rc);
 486         LNetNIFini();
 487
 488         return (-ENOMEM);
 489 }
 490
 491 #ifndef __KERNEL__
 492 CFS_LIST_HEAD(liblustre_wait_callbacks);
 493 CFS_LIST_HEAD(liblustre_idle_callbacks);
 494 void *liblustre_services_callback;
 495
 496 void *
 497 liblustre_register_waitidle_callback (struct list_head *callback_list,
 498                                       const char *name,
 499                                       int (*fn)(void *arg), void *arg)
 500 {
 501         struct liblustre_wait_callback *llwc;
 502
 503         OBD_ALLOC(llwc, sizeof(*llwc));
 504         LASSERT (llwc != NULL);
 505
 506         llwc->llwc_name = name;
 507         llwc->llwc_fn = fn;
 508         llwc->llwc_arg = arg;
 509         list_add_tail(&llwc->llwc_list, callback_list);
 510
 511         return (llwc);
 512 }
 513
 514 void
 515 liblustre_deregister_waitidle_callback (void *opaque)
 516 {
 517         struct liblustre_wait_callback *llwc = opaque;
 518
 519         list_del(&llwc->llwc_list);
 520         OBD_FREE(llwc, sizeof(*llwc));
 521 }
 522
 523 void *
 524 liblustre_register_wait_callback (const char *name,
 525                                   int (*fn)(void *arg), void *arg)
 526 {
 527         return liblustre_register_waitidle_callback(&liblustre_wait_callbacks,
 528                                                     name, fn, arg);
 529 }
 530
 531 void
 532 liblustre_deregister_wait_callback (void *opaque)
 533 {
 534         liblustre_deregister_waitidle_callback(opaque);
 535 }
 536
 537 void *
 538 liblustre_register_idle_callback (const char *name,
 539                                   int (*fn)(void *arg), void *arg)
 540 {
 541         return liblustre_register_waitidle_callback(&liblustre_idle_callbacks,
 542                                                     name, fn, arg);
 543 }
 544
 545 void
 546 liblustre_deregister_idle_callback (void *opaque)
 547 {
 548         liblustre_deregister_waitidle_callback(opaque);
 549 }
 550
 551 int
 552 liblustre_check_events (int timeout)
 553 {
 554         lnet_event_t ev;
 555         int         rc;
 556         int         i;
 557         ENTRY;
 558
 559         rc = LNetEQPoll(&ptlrpc_eq_h, 1, timeout * 1000, &ev, &i);
 560         if (rc == 0)
 561                 RETURN(0);
 562
 563         LASSERT (rc == -EOVERFLOW || rc == 1);
 564
 565         /* liblustre: no asynch callback so we can't affort to miss any
 566          * events... */
 567         if (rc == -EOVERFLOW) {
 568                 CERROR ("Dropped an event!!!\n");
 569                 abort();
 570         }
 571
 572         ptlrpc_master_callback (&ev);
 573         RETURN(1);
 574 }
 575
 576 int liblustre_waiting = 0;
 577
 578 int
 579 liblustre_wait_event (int timeout)
 580 {
 581         struct list_head               *tmp;
 582         struct liblustre_wait_callback *llwc;
 583         int                             found_something = 0;
 584
 585         /* single threaded recursion check... */
 586         liblustre_waiting = 1;
 587
 588         for (;;) {
 589                 /* Deal with all pending events */
 590                 while (liblustre_check_events(0))
 591                         found_something = 1;
 592
 593                 /* Give all registered callbacks a bite at the cherry */
 594                 list_for_each(tmp, &liblustre_wait_callbacks) {
 595                         llwc = list_entry(tmp, struct liblustre_wait_callback,
 596                                           llwc_list);
 597
 598                         if (llwc->llwc_fn(llwc->llwc_arg))
 599                                 found_something = 1;
 600                 }
 601
 602                 if (found_something || timeout == 0)
 603                         break;
 604
 605                 /* Nothing so far, but I'm allowed to block... */
 606                 found_something = liblustre_check_events(timeout);
 607                 if (!found_something)           /* still nothing */
 608                         break;                  /* I timed out */
 609         }
 610
 611         liblustre_waiting = 0;
 612
 613         return found_something;
 614 }
 615
 616 void
 617 liblustre_wait_idle(void)
 618 {
 619         static int recursed = 0;
 620
 621         struct list_head               *tmp;
 622         struct liblustre_wait_callback *llwc;
 623         int                             idle = 0;
 624
 625         LASSERT(!recursed);
 626         recursed = 1;
 627
 628         do {
 629                 liblustre_wait_event(0);
 630
 631                 idle = 1;
 632
 633                 list_for_each(tmp, &liblustre_idle_callbacks) {
 634                         llwc = list_entry(tmp, struct liblustre_wait_callback,
 635                                           llwc_list);
 636
 637                         if (!llwc->llwc_fn(llwc->llwc_arg)) {
 638                                 idle = 0;
 639                                 break;
 640                         }
 641                 }
 642
 643         } while (!idle);
 644
 645         recursed = 0;
 646 }
 647
 648 #endif /* __KERNEL__ */
 649
 650 int ptlrpc_init_portals(void)
 651 {
 652         int   rc = ptlrpc_ni_init();
 653
 654         if (rc != 0) {
 655                 CERROR("network initialisation failed\n");
 656                 return -EIO;
 657         }
 658 #ifndef __KERNEL__
 659         liblustre_services_callback =
 660                 liblustre_register_wait_callback("liblustre_check_services",
 661                                                  &liblustre_check_services,
 662                                                  NULL);
 663 #endif
 664         rc = ptlrpcd_addref();
 665         if (rc == 0)
 666                 return 0;
 667
 668         CERROR("rpcd initialisation failed\n");
 669 #ifndef __KERNEL__
 670         liblustre_deregister_wait_callback(liblustre_services_callback);
 671 #endif
 672         ptlrpc_ni_fini();
 673         return rc;
 674 }
 675
 676 void ptlrpc_exit_portals(void)
 677 {
 678 #ifndef __KERNEL__
 679         liblustre_deregister_wait_callback(liblustre_services_callback);
 680 #endif
 681         ptlrpcd_decref();
 682         ptlrpc_ni_fini();
 683 }