lustre/ptlrpc/events.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   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.
  11  *
  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).
  17  *
  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
  21  *
  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
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_RPC
  38
  39 #ifndef __KERNEL__
  40 # include <liblustre.h>
  41 #else
  42 # include <libcfs/libcfs.h>
  43 # ifdef __mips64__
  44 #  include <linux/kernel.h>
  45 # endif
  46 #endif
  47
  48 #include <obd_class.h>
  49 #include <lustre_net.h>
  50 #include <lustre_sec.h>
  51 #include "ptlrpc_internal.h"
  52
  53 lnet_handle_eq_t   ptlrpc_eq_h;
  54
  55 /*
  56  *  Client's outgoing request callback
  57  */
  58 void request_out_callback(lnet_event_t *ev)
  59 {
  60         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  61         struct ptlrpc_request *req = cbid->cbid_arg;
  62         ENTRY;
  63
  64         LASSERT (ev->type == LNET_EVENT_SEND ||
  65                  ev->type == LNET_EVENT_UNLINK);
  66         LASSERT (ev->unlinked);
  67
  68         DEBUG_REQ((ev->status == 0) ? D_NET : D_ERROR, req,
  69                   "type %d, status %d", ev->type, ev->status);
  70
  71         sptlrpc_request_out_callback(req);
  72
  73         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  74
  75                 /* Failed send: make it seem like the reply timed out, just
  76                  * like failing sends in client.c does currently...  */
  77
  78                 spin_lock(&req->rq_lock);
  79                 req->rq_net_err = 1;
  80                 spin_unlock(&req->rq_lock);
  81
  82                 ptlrpc_client_wake_req(req);
  83         }
  84
  85         ptlrpc_req_finished(req);
  86
  87         EXIT;
  88 }
  89
  90 /*
  91  * Client's incoming reply callback
  92  */
  93 void reply_in_callback(lnet_event_t *ev)
  94 {
  95         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  96         struct ptlrpc_request *req = cbid->cbid_arg;
  97         ENTRY;
  98
  99         DEBUG_REQ((ev->status == 0) ? D_NET : D_ERROR, req,
 100                   "type %d, status %d", ev->type, ev->status);
 101
 102         LASSERT (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
 103         LASSERT (ev->md.start == req->rq_repbuf);
 104         LASSERT (ev->mlength <= req->rq_repbuf_len);
 105         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
 106            for adaptive timeouts' early reply. */
 107         LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
 108
 109         spin_lock(&req->rq_lock);
 110
 111         req->rq_receiving_reply = 0;
 112         req->rq_early = 0;
 113
 114         if (ev->status)
 115                 goto out_wake;
 116         if (ev->type == LNET_EVENT_UNLINK) {
 117                 req->rq_must_unlink = 0;
 118                 DEBUG_REQ(D_RPCTRACE, req, "unlink");
 119                 goto out_wake;
 120         }
 121
 122         if ((ev->offset == 0) &&
 123             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 124                 /* Early reply */
 125                 DEBUG_REQ(D_ADAPTTO, req,
 126                           "Early reply received: mlen=%u offset=%d replen=%d "
 127                           "replied=%d unlinked=%d", ev->mlength, ev->offset,
 128                           req->rq_replen, req->rq_replied, ev->unlinked);
 129
 130                 req->rq_early_count++; /* number received, client side */
 131                 if (req->rq_replied) {
 132                         /* If we already got the real reply, then we need to
 133                          * check if lnet_finalize() unlinked the md.  In that
 134                          * case, there will be no further callback of type
 135                          * LNET_EVENT_UNLINK.
 136                          */
 137                         if (ev->unlinked)
 138                                 req->rq_must_unlink = 0;
 139                         else
 140                                 DEBUG_REQ(D_RPCTRACE, req, "unlinked in reply");
 141                         goto out_wake;
 142                 }
 143                 req->rq_early = 1;
 144                 req->rq_reply_off = ev->offset;
 145                 req->rq_nob_received = ev->mlength;
 146                 /* And we're still receiving */
 147                 req->rq_receiving_reply = 1;
 148         } else {
 149                 /* Real reply */
 150                 req->rq_replied = 1;
 151                 req->rq_reply_off = ev->offset;
 152                 req->rq_nob_received = ev->mlength;
 153                 /* LNetMDUnlink can't be called under the LNET_LOCK,
 154                    so we must unlink in ptlrpc_unregister_reply */
 155                 DEBUG_REQ(D_INFO, req,
 156                           "reply in flags=%x mlen=%u offset=%d replen=%d",
 157                           lustre_msg_get_flags(req->rq_reqmsg),
 158                           ev->mlength, ev->offset, req->rq_replen);
 159         }
 160
 161         req->rq_import->imp_last_reply_time = cfs_time_current_sec();
 162
 163 out_wake:
 164         /* NB don't unlock till after wakeup; req can disappear under us
 165          * since we don't have our own ref */
 166         ptlrpc_client_wake_req(req);
 167         spin_unlock(&req->rq_lock);
 168         EXIT;
 169 }
 170
 171 /*
 172  * Client's bulk has been written/read
 173  */
 174 void client_bulk_callback (lnet_event_t *ev)
 175 {
 176         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 177         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 178         ENTRY;
 179
 180         LASSERT ((desc->bd_type == BULK_PUT_SINK &&
 181                   ev->type == LNET_EVENT_PUT) ||
 182                  (desc->bd_type == BULK_GET_SOURCE &&
 183                   ev->type == LNET_EVENT_GET) ||
 184                  ev->type == LNET_EVENT_UNLINK);
 185         LASSERT (ev->unlinked);
 186
 187         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 188                "event type %d, status %d, desc %p\n",
 189                ev->type, ev->status, desc);
 190
 191         spin_lock(&desc->bd_lock);
 192
 193         LASSERT(desc->bd_network_rw);
 194         desc->bd_network_rw = 0;
 195
 196         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 197                 desc->bd_success = 1;
 198                 desc->bd_nob_transferred = ev->mlength;
 199                 desc->bd_sender = ev->sender;
 200         }
 201
 202         sptlrpc_enc_pool_put_pages(desc);
 203
 204         /* NB don't unlock till after wakeup; desc can disappear under us
 205          * otherwise */
 206         ptlrpc_client_wake_req(desc->bd_req);
 207
 208         spin_unlock(&desc->bd_lock);
 209         EXIT;
 210 }
 211
 212 /*
 213  * Server's incoming request callback
 214  */
 215 void request_in_callback(lnet_event_t *ev)
 216 {
 217         struct ptlrpc_cb_id               *cbid = ev->md.user_ptr;
 218         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 219         struct ptlrpc_service             *service = rqbd->rqbd_service;
 220         struct ptlrpc_request             *req;
 221         ENTRY;
 222
 223         LASSERT (ev->type == LNET_EVENT_PUT ||
 224                  ev->type == LNET_EVENT_UNLINK);
 225         LASSERT ((char *)ev->md.start >= rqbd->rqbd_buffer);
 226         LASSERT ((char *)ev->md.start + ev->offset + ev->mlength <=
 227                  rqbd->rqbd_buffer + service->srv_buf_size);
 228
 229         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 230                "event type %d, status %d, service %s\n",
 231                ev->type, ev->status, service->srv_name);
 232
 233         if (ev->unlinked) {
 234                 /* If this is the last request message to fit in the
 235                  * request buffer we can use the request object embedded in
 236                  * rqbd.  Note that if we failed to allocate a request,
 237                  * we'd have to re-post the rqbd, which we can't do in this
 238                  * context. */
 239                 req = &rqbd->rqbd_req;
 240                 memset(req, 0, sizeof (*req));
 241         } else {
 242                 LASSERT (ev->type == LNET_EVENT_PUT);
 243                 if (ev->status != 0) {
 244                         /* We moaned above already... */
 245                         return;
 246                 }
 247                 OBD_ALLOC_GFP(req, sizeof(*req), CFS_ALLOC_ATOMIC_TRY);
 248                 if (req == NULL) {
 249                         CERROR("Can't allocate incoming request descriptor: "
 250                                "Dropping %s RPC from %s\n",
 251                                service->srv_name,
 252                                libcfs_id2str(ev->initiator));
 253                         return;
 254                 }
 255         }
 256
 257         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 258          * flags are reset and scalars are zero.  We only set the message
 259          * size to non-zero if this was a successful receive. */
 260         req->rq_xid = ev->match_bits;
 261         req->rq_reqbuf = ev->md.start + ev->offset;
 262         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 263                 req->rq_reqdata_len = ev->mlength;
 264         do_gettimeofday(&req->rq_arrival_time);
 265         req->rq_peer = ev->initiator;
 266         req->rq_self = ev->target.nid;
 267         req->rq_rqbd = rqbd;
 268         req->rq_phase = RQ_PHASE_NEW;
 269 #ifdef CRAY_XT3
 270         req->rq_uid = ev->uid;
 271 #endif
 272         spin_lock_init(&req->rq_lock);
 273         CFS_INIT_LIST_HEAD(&req->rq_timed_list);
 274         atomic_set(&req->rq_refcount, 1);
 275         if (ev->type == LNET_EVENT_PUT)
 276                 DEBUG_REQ(D_RPCTRACE, req, "incoming req");
 277
 278         CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
 279
 280         spin_lock(&service->srv_lock);
 281
 282         req->rq_history_seq = service->srv_request_seq++;
 283         list_add_tail(&req->rq_history_list, &service->srv_request_history);
 284
 285         if (ev->unlinked) {
 286                 service->srv_nrqbd_receiving--;
 287                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 288                        service->srv_nrqbd_receiving);
 289
 290                 /* Normally, don't complain about 0 buffers posted; LNET won't
 291                  * drop incoming reqs since we set the portal lazy */
 292                 if (test_req_buffer_pressure &&
 293                     ev->type != LNET_EVENT_UNLINK &&
 294                     service->srv_nrqbd_receiving == 0)
 295                         CWARN("All %s request buffers busy\n",
 296                               service->srv_name);
 297
 298                 /* req takes over the network's ref on rqbd */
 299         } else {
 300                 /* req takes a ref on rqbd */
 301                 rqbd->rqbd_refcount++;
 302         }
 303
 304         list_add_tail(&req->rq_list, &service->srv_req_in_queue);
 305         service->srv_n_queued_reqs++;
 306
 307         /* NB everything can disappear under us once the request
 308          * has been queued and we unlock, so do the wake now... */
 309         cfs_waitq_signal(&service->srv_waitq);
 310
 311         spin_unlock(&service->srv_lock);
 312         EXIT;
 313 }
 314
 315 /*
 316  *  Server's outgoing reply callback
 317  */
 318 void reply_out_callback(lnet_event_t *ev)
 319 {
 320         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 321         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 322         struct ptlrpc_service     *svc = rs->rs_service;
 323         ENTRY;
 324
 325         LASSERT (ev->type == LNET_EVENT_SEND ||
 326                  ev->type == LNET_EVENT_ACK ||
 327                  ev->type == LNET_EVENT_UNLINK);
 328
 329         if (!rs->rs_difficult) {
 330                 /* 'Easy' replies have no further processing so I drop the
 331                  * net's ref on 'rs' */
 332                 LASSERT (ev->unlinked);
 333                 ptlrpc_rs_decref(rs);
 334                 atomic_dec (&svc->srv_outstanding_replies);
 335                 EXIT;
 336                 return;
 337         }
 338
 339         LASSERT (rs->rs_on_net);
 340
 341         if (ev->unlinked) {
 342                 /* Last network callback.  The net's ref on 'rs' stays put
 343                  * until ptlrpc_server_handle_reply() is done with it */
 344                 spin_lock(&svc->srv_lock);
 345                 spin_lock(&rs->rs_lock);
 346                 rs->rs_on_net = 0;
 347                 if (!rs->rs_no_ack ||
 348                     rs->rs_transno <= rs->rs_export->exp_obd->obd_last_committed)
 349                         ptlrpc_schedule_difficult_reply (rs);
 350                 spin_unlock(&rs->rs_lock);
 351                 spin_unlock(&svc->srv_lock);
 352         }
 353
 354         EXIT;
 355 }
 356
 357 /*
 358  * Server's bulk completion callback
 359  */
 360 void server_bulk_callback (lnet_event_t *ev)
 361 {
 362         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 363         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 364         ENTRY;
 365
 366         LASSERT (ev->type == LNET_EVENT_SEND ||
 367                  ev->type == LNET_EVENT_UNLINK ||
 368                  (desc->bd_type == BULK_PUT_SOURCE &&
 369                   ev->type == LNET_EVENT_ACK) ||
 370                  (desc->bd_type == BULK_GET_SINK &&
 371                   ev->type == LNET_EVENT_REPLY));
 372
 373         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 374                "event type %d, status %d, desc %p\n",
 375                ev->type, ev->status, desc);
 376
 377         spin_lock(&desc->bd_lock);
 378
 379         if ((ev->type == LNET_EVENT_ACK ||
 380              ev->type == LNET_EVENT_REPLY) &&
 381             ev->status == 0) {
 382                 /* We heard back from the peer, so even if we get this
 383                  * before the SENT event (oh yes we can), we know we
 384                  * read/wrote the peer buffer and how much... */
 385                 desc->bd_success = 1;
 386                 desc->bd_nob_transferred = ev->mlength;
 387                 desc->bd_sender = ev->sender;
 388         }
 389
 390         if (ev->unlinked) {
 391                 /* This is the last callback no matter what... */
 392                 desc->bd_network_rw = 0;
 393                 cfs_waitq_signal(&desc->bd_waitq);
 394         }
 395
 396         spin_unlock(&desc->bd_lock);
 397         EXIT;
 398 }
 399
 400 static void ptlrpc_master_callback(lnet_event_t *ev)
 401 {
 402         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 403         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 404
 405         /* Honestly, it's best to find out early. */
 406         LASSERT (cbid->cbid_arg != LP_POISON);
 407         LASSERT (callback == request_out_callback ||
 408                  callback == reply_in_callback ||
 409                  callback == client_bulk_callback ||
 410                  callback == request_in_callback ||
 411                  callback == reply_out_callback ||
 412                  callback == server_bulk_callback);
 413
 414         callback (ev);
 415 }
 416
 417 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 418                          lnet_process_id_t *peer, lnet_nid_t *self)
 419 {
 420         int               best_dist = 0;
 421         __u32             best_order = 0;
 422         int               count = 0;
 423         int               rc = -ENOENT;
 424         int               portals_compatibility;
 425         int               dist;
 426         __u32             order;
 427         lnet_nid_t        dst_nid;
 428         lnet_nid_t        src_nid;
 429
 430         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 431
 432         peer->pid = LUSTRE_SRV_LNET_PID;
 433
 434         /* Choose the matching UUID that's closest */
 435         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 436                 dist = LNetDist(dst_nid, &src_nid, &order);
 437                 if (dist < 0)
 438                         continue;
 439
 440                 if (dist == 0) {                /* local! use loopback LND */
 441                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 442                         rc = 0;
 443                         break;
 444                 }
 445
 446                 if (rc < 0 ||
 447                     dist < best_dist ||
 448                     (dist == best_dist && order < best_order)) {
 449                         best_dist = dist;
 450                         best_order = order;
 451
 452                         if (portals_compatibility > 1) {
 453                                 /* Strong portals compatibility: Zero the nid's
 454                                  * NET, so if I'm reading new config logs, or
 455                                  * getting configured by (new) lconf I can
 456                                  * still talk to old servers. */
 457                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 458                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 459                         }
 460                         peer->nid = dst_nid;
 461                         *self = src_nid;
 462                         rc = 0;
 463                 }
 464         }
 465
 466         CDEBUG(D_NET,"%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 467         if (rc != 0)
 468                 CERROR("No NID found for %s\n", uuid->uuid);
 469         return rc;
 470 }
 471
 472 void ptlrpc_ni_fini(void)
 473 {
 474         cfs_waitq_t         waitq;
 475         struct l_wait_info  lwi;
 476         int                 rc;
 477         int                 retries;
 478
 479         /* Wait for the event queue to become idle since there may still be
 480          * messages in flight with pending events (i.e. the fire-and-forget
 481          * messages == client requests and "non-difficult" server
 482          * replies */
 483
 484         for (retries = 0;; retries++) {
 485                 rc = LNetEQFree(ptlrpc_eq_h);
 486                 switch (rc) {
 487                 default:
 488                         LBUG();
 489
 490                 case 0:
 491                         LNetNIFini();
 492                         return;
 493
 494                 case -EBUSY:
 495                         if (retries != 0)
 496                                 CWARN("Event queue still busy\n");
 497
 498                         /* Wait for a bit */
 499                         cfs_waitq_init(&waitq);
 500                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 501                         l_wait_event(waitq, 0, &lwi);
 502                         break;
 503                 }
 504         }
 505         /* notreached */
 506 }
 507
 508 lnet_pid_t ptl_get_pid(void)
 509 {
 510         lnet_pid_t        pid;
 511
 512 #ifndef  __KERNEL__
 513         pid = getpid();
 514 #else
 515         pid = LUSTRE_SRV_LNET_PID;
 516 #endif
 517         return pid;
 518 }
 519
 520 int ptlrpc_ni_init(void)
 521 {
 522         int              rc;
 523         lnet_pid_t       pid;
 524
 525         pid = ptl_get_pid();
 526         CDEBUG(D_NET, "My pid is: %x\n", pid);
 527
 528         /* We're not passing any limits yet... */
 529         rc = LNetNIInit(pid);
 530         if (rc < 0) {
 531                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 532                 return (-ENOENT);
 533         }
 534
 535         /* CAVEAT EMPTOR: how we process portals events is _radically_
 536          * different depending on... */
 537 #ifdef __KERNEL__
 538         /* kernel portals calls our master callback when events are added to
 539          * the event queue.  In fact lustre never pulls events off this queue,
 540          * so it's only sized for some debug history. */
 541         rc = LNetEQAlloc(1024, ptlrpc_master_callback, &ptlrpc_eq_h);
 542 #else
 543         /* liblustre calls the master callback when it removes events from the
 544          * event queue.  The event queue has to be big enough not to drop
 545          * anything */
 546         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &ptlrpc_eq_h);
 547 #endif
 548         if (rc == 0)
 549                 return 0;
 550
 551         CERROR ("Failed to allocate event queue: %d\n", rc);
 552         LNetNIFini();
 553
 554         return (-ENOMEM);
 555 }
 556
 557 #ifndef __KERNEL__
 558 CFS_LIST_HEAD(liblustre_wait_callbacks);
 559 CFS_LIST_HEAD(liblustre_idle_callbacks);
 560 void *liblustre_services_callback;
 561
 562 void *
 563 liblustre_register_waitidle_callback (struct list_head *callback_list,
 564                                       const char *name,
 565                                       int (*fn)(void *arg), void *arg)
 566 {
 567         struct liblustre_wait_callback *llwc;
 568
 569         OBD_ALLOC(llwc, sizeof(*llwc));
 570         LASSERT (llwc != NULL);
 571
 572         llwc->llwc_name = name;
 573         llwc->llwc_fn = fn;
 574         llwc->llwc_arg = arg;
 575         list_add_tail(&llwc->llwc_list, callback_list);
 576
 577         return (llwc);
 578 }
 579
 580 void
 581 liblustre_deregister_waitidle_callback (void *opaque)
 582 {
 583         struct liblustre_wait_callback *llwc = opaque;
 584
 585         list_del(&llwc->llwc_list);
 586         OBD_FREE(llwc, sizeof(*llwc));
 587 }
 588
 589 void *
 590 liblustre_register_wait_callback (const char *name,
 591                                   int (*fn)(void *arg), void *arg)
 592 {
 593         return liblustre_register_waitidle_callback(&liblustre_wait_callbacks,
 594                                                     name, fn, arg);
 595 }
 596
 597 void
 598 liblustre_deregister_wait_callback (void *opaque)
 599 {
 600         liblustre_deregister_waitidle_callback(opaque);
 601 }
 602
 603 void *
 604 liblustre_register_idle_callback (const char *name,
 605                                   int (*fn)(void *arg), void *arg)
 606 {
 607         return liblustre_register_waitidle_callback(&liblustre_idle_callbacks,
 608                                                     name, fn, arg);
 609 }
 610
 611 void
 612 liblustre_deregister_idle_callback (void *opaque)
 613 {
 614         liblustre_deregister_waitidle_callback(opaque);
 615 }
 616
 617 int
 618 liblustre_check_events (int timeout)
 619 {
 620         lnet_event_t ev;
 621         int         rc;
 622         int         i;
 623         ENTRY;
 624
 625         rc = LNetEQPoll(&ptlrpc_eq_h, 1, timeout * 1000, &ev, &i);
 626         if (rc == 0)
 627                 RETURN(0);
 628
 629         LASSERT (rc == -EOVERFLOW || rc == 1);
 630
 631         /* liblustre: no asynch callback so we can't affort to miss any
 632          * events... */
 633         if (rc == -EOVERFLOW) {
 634                 CERROR ("Dropped an event!!!\n");
 635                 abort();
 636         }
 637
 638         ptlrpc_master_callback (&ev);
 639         RETURN(1);
 640 }
 641
 642 int liblustre_waiting = 0;
 643
 644 int
 645 liblustre_wait_event (int timeout)
 646 {
 647         struct list_head               *tmp;
 648         struct liblustre_wait_callback *llwc;
 649         int                             found_something = 0;
 650
 651         /* single threaded recursion check... */
 652         liblustre_waiting = 1;
 653
 654         for (;;) {
 655                 /* Deal with all pending events */
 656                 while (liblustre_check_events(0))
 657                         found_something = 1;
 658
 659                 /* Give all registered callbacks a bite at the cherry */
 660                 list_for_each(tmp, &liblustre_wait_callbacks) {
 661                         llwc = list_entry(tmp, struct liblustre_wait_callback,
 662                                           llwc_list);
 663
 664                         if (llwc->llwc_fn(llwc->llwc_arg))
 665                                 found_something = 1;
 666                 }
 667
 668                 if (found_something || timeout == 0)
 669                         break;
 670
 671                 /* Nothing so far, but I'm allowed to block... */
 672                 found_something = liblustre_check_events(timeout);
 673                 if (!found_something)           /* still nothing */
 674                         break;                  /* I timed out */
 675         }
 676
 677         liblustre_waiting = 0;
 678
 679         return found_something;
 680 }
 681
 682 void
 683 liblustre_wait_idle(void)
 684 {
 685         static int recursed = 0;
 686
 687         struct list_head               *tmp;
 688         struct liblustre_wait_callback *llwc;
 689         int                             idle = 0;
 690
 691         LASSERT(!recursed);
 692         recursed = 1;
 693
 694         do {
 695                 liblustre_wait_event(0);
 696
 697                 idle = 1;
 698
 699                 list_for_each(tmp, &liblustre_idle_callbacks) {
 700                         llwc = list_entry(tmp, struct liblustre_wait_callback,
 701                                           llwc_list);
 702
 703                         if (!llwc->llwc_fn(llwc->llwc_arg)) {
 704                                 idle = 0;
 705                                 break;
 706                         }
 707                 }
 708
 709         } while (!idle);
 710
 711         recursed = 0;
 712 }
 713
 714 #endif /* __KERNEL__ */
 715
 716 int ptlrpc_init_portals(void)
 717 {
 718         int   rc = ptlrpc_ni_init();
 719
 720         if (rc != 0) {
 721                 CERROR("network initialisation failed\n");
 722                 return -EIO;
 723         }
 724 #ifndef __KERNEL__
 725         liblustre_services_callback =
 726                 liblustre_register_wait_callback("liblustre_check_services",
 727                                                  &liblustre_check_services,
 728                                                  NULL);
 729         init_completion_module(liblustre_wait_event);
 730 #endif
 731         rc = ptlrpcd_addref();
 732         if (rc == 0)
 733                 return 0;
 734
 735         CERROR("rpcd initialisation failed\n");
 736 #ifndef __KERNEL__
 737         liblustre_deregister_wait_callback(liblustre_services_callback);
 738 #endif
 739         ptlrpc_ni_fini();
 740         return rc;
 741 }
 742
 743 void ptlrpc_exit_portals(void)
 744 {
 745 #ifndef __KERNEL__
 746         liblustre_deregister_wait_callback(liblustre_services_callback);
 747 #endif
 748         ptlrpcd_decref();
 749         ptlrpc_ni_fini();
 750 }