lustre/ptlrpc/events.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  */
  34
  35 #define DEBUG_SUBSYSTEM S_RPC
  36
  37 #ifndef __KERNEL__
  38 # include <liblustre.h>
  39 #else
  40 # include <libcfs/libcfs.h>
  41 # ifdef __mips64__
  42 #  include <linux/kernel.h>
  43 # endif
  44 #endif
  45
  46 #include <obd_class.h>
  47 #include <lustre_net.h>
  48 #include <lustre_sec.h>
  49 #include "ptlrpc_internal.h"
  50
  51 lnet_handle_eq_t   ptlrpc_eq_h;
  52
  53 /*
  54  *  Client's outgoing request callback
  55  */
  56 void request_out_callback(lnet_event_t *ev)
  57 {
  58         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  59         struct ptlrpc_request *req = cbid->cbid_arg;
  60         ENTRY;
  61
  62         LASSERT (ev->type == LNET_EVENT_SEND ||
  63                  ev->type == LNET_EVENT_UNLINK);
  64         LASSERT (ev->unlinked);
  65
  66         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  67
  68         sptlrpc_request_out_callback(req);
  69         req->rq_real_sent = cfs_time_current_sec();
  70
  71         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  72
  73                 /* Failed send: make it seem like the reply timed out, just
  74                  * like failing sends in client.c does currently...  */
  75
  76                 cfs_spin_lock(&req->rq_lock);
  77                 req->rq_net_err = 1;
  78                 cfs_spin_unlock(&req->rq_lock);
  79
  80                 ptlrpc_client_wake_req(req);
  81         }
  82
  83         ptlrpc_req_finished(req);
  84
  85         EXIT;
  86 }
  87
  88 /*
  89  * Client's incoming reply callback
  90  */
  91 void reply_in_callback(lnet_event_t *ev)
  92 {
  93         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  94         struct ptlrpc_request *req = cbid->cbid_arg;
  95         ENTRY;
  96
  97         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  98
  99         LASSERT (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
 100         LASSERT (ev->md.start == req->rq_repbuf);
 101         LASSERT (ev->offset + ev->mlength <= req->rq_repbuf_len);
 102         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
 103            for adaptive timeouts' early reply. */
 104         LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
 105
 106         cfs_spin_lock(&req->rq_lock);
 107
 108         req->rq_receiving_reply = 0;
 109         req->rq_early = 0;
 110         if (ev->unlinked)
 111                 req->rq_must_unlink = 0;
 112
 113         if (ev->status)
 114                 goto out_wake;
 115
 116         if (ev->type == LNET_EVENT_UNLINK) {
 117                 LASSERT(ev->unlinked);
 118                 DEBUG_REQ(D_NET, req, "unlink");
 119                 goto out_wake;
 120         }
 121
 122         if (ev->mlength < ev->rlength ) {
 123                 CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
 124                        req->rq_replen, ev->rlength, ev->offset);
 125                 req->rq_reply_truncate = 1;
 126                 req->rq_replied = 1;
 127                 req->rq_status = -EOVERFLOW;
 128                 req->rq_nob_received = ev->rlength + ev->offset;
 129                 goto out_wake;
 130         }
 131
 132         if ((ev->offset == 0) &&
 133             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 134                 /* Early reply */
 135                 DEBUG_REQ(D_ADAPTTO, req,
 136                           "Early reply received: mlen=%u offset=%d replen=%d "
 137                           "replied=%d unlinked=%d", ev->mlength, ev->offset,
 138                           req->rq_replen, req->rq_replied, ev->unlinked);
 139
 140                 req->rq_early_count++; /* number received, client side */
 141
 142                 if (req->rq_replied)   /* already got the real reply */
 143                         goto out_wake;
 144
 145                 req->rq_early = 1;
 146                 req->rq_reply_off = ev->offset;
 147                 req->rq_nob_received = ev->mlength;
 148                 /* And we're still receiving */
 149                 req->rq_receiving_reply = 1;
 150         } else {
 151                 /* Real reply */
 152                 req->rq_rep_swab_mask = 0;
 153                 req->rq_replied = 1;
 154                 req->rq_reply_off = ev->offset;
 155                 req->rq_nob_received = ev->mlength;
 156                 /* LNetMDUnlink can't be called under the LNET_LOCK,
 157                    so we must unlink in ptlrpc_unregister_reply */
 158                 DEBUG_REQ(D_INFO, req,
 159                           "reply in flags=%x mlen=%u offset=%d replen=%d",
 160                           lustre_msg_get_flags(req->rq_reqmsg),
 161                           ev->mlength, ev->offset, req->rq_replen);
 162         }
 163
 164         req->rq_import->imp_last_reply_time = cfs_time_current_sec();
 165
 166 out_wake:
 167         /* NB don't unlock till after wakeup; req can disappear under us
 168          * since we don't have our own ref */
 169         ptlrpc_client_wake_req(req);
 170         cfs_spin_unlock(&req->rq_lock);
 171         EXIT;
 172 }
 173
 174 /*
 175  * Client's bulk has been written/read
 176  */
 177 void client_bulk_callback (lnet_event_t *ev)
 178 {
 179         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 180         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 181         ENTRY;
 182
 183         LASSERT ((desc->bd_type == BULK_PUT_SINK &&
 184                   ev->type == LNET_EVENT_PUT) ||
 185                  (desc->bd_type == BULK_GET_SOURCE &&
 186                   ev->type == LNET_EVENT_GET) ||
 187                  ev->type == LNET_EVENT_UNLINK);
 188         LASSERT (ev->unlinked);
 189
 190         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 191                 ev->status = -EIO;
 192
 193         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,CFS_FAIL_ONCE))
 194                 ev->status = -EIO;
 195
 196         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 197                "event type %d, status %d, desc %p\n",
 198                ev->type, ev->status, desc);
 199
 200         cfs_spin_lock(&desc->bd_lock);
 201
 202         LASSERT(desc->bd_network_rw);
 203         desc->bd_network_rw = 0;
 204
 205         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 206                 desc->bd_success = 1;
 207                 desc->bd_nob_transferred = ev->mlength;
 208                 desc->bd_sender = ev->sender;
 209         }
 210
 211         /* release the encrypted pages for write */
 212         if (desc->bd_req->rq_bulk_write)
 213                 sptlrpc_enc_pool_put_pages(desc);
 214
 215         /* NB don't unlock till after wakeup; desc can disappear under us
 216          * otherwise */
 217         ptlrpc_client_wake_req(desc->bd_req);
 218
 219         cfs_spin_unlock(&desc->bd_lock);
 220         EXIT;
 221 }
 222
 223 /*
 224  * Server's incoming request callback
 225  */
 226 void request_in_callback(lnet_event_t *ev)
 227 {
 228         struct ptlrpc_cb_id               *cbid = ev->md.user_ptr;
 229         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 230         struct ptlrpc_service             *service = rqbd->rqbd_service;
 231         struct ptlrpc_request             *req;
 232         ENTRY;
 233
 234         LASSERT (ev->type == LNET_EVENT_PUT ||
 235                  ev->type == LNET_EVENT_UNLINK);
 236         LASSERT ((char *)ev->md.start >= rqbd->rqbd_buffer);
 237         LASSERT ((char *)ev->md.start + ev->offset + ev->mlength <=
 238                  rqbd->rqbd_buffer + service->srv_buf_size);
 239
 240         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 241                "event type %d, status %d, service %s\n",
 242                ev->type, ev->status, service->srv_name);
 243
 244         if (ev->unlinked) {
 245                 /* If this is the last request message to fit in the
 246                  * request buffer we can use the request object embedded in
 247                  * rqbd.  Note that if we failed to allocate a request,
 248                  * we'd have to re-post the rqbd, which we can't do in this
 249                  * context. */
 250                 req = &rqbd->rqbd_req;
 251                 memset(req, 0, sizeof (*req));
 252         } else {
 253                 LASSERT (ev->type == LNET_EVENT_PUT);
 254                 if (ev->status != 0) {
 255                         /* We moaned above already... */
 256                         return;
 257                 }
 258                 OBD_ALLOC_GFP(req, sizeof(*req), CFS_ALLOC_ATOMIC_TRY);
 259                 if (req == NULL) {
 260                         CERROR("Can't allocate incoming request descriptor: "
 261                                "Dropping %s RPC from %s\n",
 262                                service->srv_name,
 263                                libcfs_id2str(ev->initiator));
 264                         return;
 265                 }
 266         }
 267
 268         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 269          * flags are reset and scalars are zero.  We only set the message
 270          * size to non-zero if this was a successful receive. */
 271         req->rq_xid = ev->match_bits;
 272         req->rq_reqbuf = ev->md.start + ev->offset;
 273         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 274                 req->rq_reqdata_len = ev->mlength;
 275         cfs_gettimeofday(&req->rq_arrival_time);
 276         req->rq_peer = ev->initiator;
 277         req->rq_self = ev->target.nid;
 278         req->rq_rqbd = rqbd;
 279         req->rq_phase = RQ_PHASE_NEW;
 280 #ifdef CRAY_XT3
 281         req->rq_uid = ev->uid;
 282 #endif
 283         cfs_spin_lock_init(&req->rq_lock);
 284         CFS_INIT_LIST_HEAD(&req->rq_timed_list);
 285         cfs_atomic_set(&req->rq_refcount, 1);
 286         if (ev->type == LNET_EVENT_PUT)
 287                 CDEBUG(D_INFO, "incoming req@%p x"LPU64" msgsize %u\n",
 288                        req, req->rq_xid, ev->mlength);
 289
 290         CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
 291
 292         cfs_spin_lock(&service->srv_lock);
 293
 294         req->rq_history_seq = service->srv_request_seq++;
 295         cfs_list_add_tail(&req->rq_history_list, &service->srv_request_history);
 296
 297         if (ev->unlinked) {
 298                 service->srv_nrqbd_receiving--;
 299                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 300                        service->srv_nrqbd_receiving);
 301
 302                 /* Normally, don't complain about 0 buffers posted; LNET won't
 303                  * drop incoming reqs since we set the portal lazy */
 304                 if (test_req_buffer_pressure &&
 305                     ev->type != LNET_EVENT_UNLINK &&
 306                     service->srv_nrqbd_receiving == 0)
 307                         CWARN("All %s request buffers busy\n",
 308                               service->srv_name);
 309
 310                 /* req takes over the network's ref on rqbd */
 311         } else {
 312                 /* req takes a ref on rqbd */
 313                 rqbd->rqbd_refcount++;
 314         }
 315
 316         cfs_list_add_tail(&req->rq_list, &service->srv_req_in_queue);
 317         service->srv_n_queued_reqs++;
 318
 319         /* NB everything can disappear under us once the request
 320          * has been queued and we unlock, so do the wake now... */
 321         cfs_waitq_signal(&service->srv_waitq);
 322
 323         cfs_spin_unlock(&service->srv_lock);
 324         EXIT;
 325 }
 326
 327 /*
 328  *  Server's outgoing reply callback
 329  */
 330 void reply_out_callback(lnet_event_t *ev)
 331 {
 332         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 333         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 334         struct ptlrpc_service     *svc = rs->rs_service;
 335         ENTRY;
 336
 337         LASSERT (ev->type == LNET_EVENT_SEND ||
 338                  ev->type == LNET_EVENT_ACK ||
 339                  ev->type == LNET_EVENT_UNLINK);
 340
 341         if (!rs->rs_difficult) {
 342                 /* 'Easy' replies have no further processing so I drop the
 343                  * net's ref on 'rs' */
 344                 LASSERT (ev->unlinked);
 345                 ptlrpc_rs_decref(rs);
 346                 EXIT;
 347                 return;
 348         }
 349
 350         LASSERT (rs->rs_on_net);
 351
 352         if (ev->unlinked) {
 353                 /* Last network callback. The net's ref on 'rs' stays put
 354                  * until ptlrpc_handle_rs() is done with it */
 355                 cfs_spin_lock(&svc->srv_rs_lock);
 356                 cfs_spin_lock(&rs->rs_lock);
 357                 rs->rs_on_net = 0;
 358                 if (!rs->rs_no_ack ||
 359                     rs->rs_transno <= rs->rs_export->exp_obd->obd_last_committed)
 360                         ptlrpc_schedule_difficult_reply (rs);
 361                 cfs_spin_unlock(&rs->rs_lock);
 362                 cfs_spin_unlock(&svc->srv_rs_lock);
 363         }
 364
 365         EXIT;
 366 }
 367
 368 #ifdef HAVE_SERVER_SUPPORT
 369 /*
 370  * Server's bulk completion callback
 371  */
 372 void server_bulk_callback (lnet_event_t *ev)
 373 {
 374         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 375         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 376         ENTRY;
 377
 378         LASSERT (ev->type == LNET_EVENT_SEND ||
 379                  ev->type == LNET_EVENT_UNLINK ||
 380                  (desc->bd_type == BULK_PUT_SOURCE &&
 381                   ev->type == LNET_EVENT_ACK) ||
 382                  (desc->bd_type == BULK_GET_SINK &&
 383                   ev->type == LNET_EVENT_REPLY));
 384
 385         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 386                "event type %d, status %d, desc %p\n",
 387                ev->type, ev->status, desc);
 388
 389         cfs_spin_lock(&desc->bd_lock);
 390
 391         if ((ev->type == LNET_EVENT_ACK ||
 392              ev->type == LNET_EVENT_REPLY) &&
 393             ev->status == 0) {
 394                 /* We heard back from the peer, so even if we get this
 395                  * before the SENT event (oh yes we can), we know we
 396                  * read/wrote the peer buffer and how much... */
 397                 desc->bd_success = 1;
 398                 desc->bd_nob_transferred = ev->mlength;
 399                 desc->bd_sender = ev->sender;
 400         }
 401
 402         if (ev->unlinked) {
 403                 /* This is the last callback no matter what... */
 404                 desc->bd_network_rw = 0;
 405                 cfs_waitq_signal(&desc->bd_waitq);
 406         }
 407
 408         cfs_spin_unlock(&desc->bd_lock);
 409         EXIT;
 410 }
 411 #endif
 412
 413 static void ptlrpc_master_callback(lnet_event_t *ev)
 414 {
 415         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 416         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 417
 418         /* Honestly, it's best to find out early. */
 419         LASSERT (cbid->cbid_arg != LP_POISON);
 420         LASSERT (callback == request_out_callback ||
 421                  callback == reply_in_callback ||
 422                  callback == client_bulk_callback ||
 423                  callback == request_in_callback ||
 424                  callback == reply_out_callback
 425 #ifdef HAVE_SERVER_SUPPORT
 426                  || callback == server_bulk_callback
 427 #endif
 428                  );
 429
 430         callback (ev);
 431 }
 432
 433 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 434                          lnet_process_id_t *peer, lnet_nid_t *self)
 435 {
 436         int               best_dist = 0;
 437         __u32             best_order = 0;
 438         int               count = 0;
 439         int               rc = -ENOENT;
 440         int               portals_compatibility;
 441         int               dist;
 442         __u32             order;
 443         lnet_nid_t        dst_nid;
 444         lnet_nid_t        src_nid;
 445
 446         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 447
 448         peer->pid = LUSTRE_SRV_LNET_PID;
 449
 450         /* Choose the matching UUID that's closest */
 451         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 452                 dist = LNetDist(dst_nid, &src_nid, &order);
 453                 if (dist < 0)
 454                         continue;
 455
 456                 if (dist == 0) {                /* local! use loopback LND */
 457                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 458                         rc = 0;
 459                         break;
 460                 }
 461
 462                 if (rc < 0 ||
 463                     dist < best_dist ||
 464                     (dist == best_dist && order < best_order)) {
 465                         best_dist = dist;
 466                         best_order = order;
 467
 468                         if (portals_compatibility > 1) {
 469                                 /* Strong portals compatibility: Zero the nid's
 470                                  * NET, so if I'm reading new config logs, or
 471                                  * getting configured by (new) lconf I can
 472                                  * still talk to old servers. */
 473                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 474                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 475                         }
 476                         peer->nid = dst_nid;
 477                         *self = src_nid;
 478                         rc = 0;
 479                 }
 480         }
 481
 482         CDEBUG(D_NET,"%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 483         return rc;
 484 }
 485
 486 void ptlrpc_ni_fini(void)
 487 {
 488         cfs_waitq_t         waitq;
 489         struct l_wait_info  lwi;
 490         int                 rc;
 491         int                 retries;
 492
 493         /* Wait for the event queue to become idle since there may still be
 494          * messages in flight with pending events (i.e. the fire-and-forget
 495          * messages == client requests and "non-difficult" server
 496          * replies */
 497
 498         for (retries = 0;; retries++) {
 499                 rc = LNetEQFree(ptlrpc_eq_h);
 500                 switch (rc) {
 501                 default:
 502                         LBUG();
 503
 504                 case 0:
 505                         LNetNIFini();
 506                         return;
 507
 508                 case -EBUSY:
 509                         if (retries != 0)
 510                                 CWARN("Event queue still busy\n");
 511
 512                         /* Wait for a bit */
 513                         cfs_waitq_init(&waitq);
 514                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 515                         l_wait_event(waitq, 0, &lwi);
 516                         break;
 517                 }
 518         }
 519         /* notreached */
 520 }
 521
 522 lnet_pid_t ptl_get_pid(void)
 523 {
 524         lnet_pid_t        pid;
 525
 526 #ifndef  __KERNEL__
 527         pid = getpid();
 528 #else
 529         pid = LUSTRE_SRV_LNET_PID;
 530 #endif
 531         return pid;
 532 }
 533
 534 int ptlrpc_ni_init(void)
 535 {
 536         int              rc;
 537         lnet_pid_t       pid;
 538
 539         pid = ptl_get_pid();
 540         CDEBUG(D_NET, "My pid is: %x\n", pid);
 541
 542         /* We're not passing any limits yet... */
 543         rc = LNetNIInit(pid);
 544         if (rc < 0) {
 545                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 546                 return (-ENOENT);
 547         }
 548
 549         /* CAVEAT EMPTOR: how we process portals events is _radically_
 550          * different depending on... */
 551 #ifdef __KERNEL__
 552         /* kernel LNet calls our master callback when there are new event,
 553          * because we are guaranteed to get every event via callback,
 554          * so we just set EQ size to 0 to avoid overhread of serializing
 555          * enqueue/dequeue operations in LNet. */
 556         rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
 557 #else
 558         /* liblustre calls the master callback when it removes events from the
 559          * event queue.  The event queue has to be big enough not to drop
 560          * anything */
 561         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &ptlrpc_eq_h);
 562 #endif
 563         if (rc == 0)
 564                 return 0;
 565
 566         CERROR ("Failed to allocate event queue: %d\n", rc);
 567         LNetNIFini();
 568
 569         return (-ENOMEM);
 570 }
 571
 572 #ifndef __KERNEL__
 573 CFS_LIST_HEAD(liblustre_wait_callbacks);
 574 CFS_LIST_HEAD(liblustre_idle_callbacks);
 575 void *liblustre_services_callback;
 576
 577 void *
 578 liblustre_register_waitidle_callback (cfs_list_t *callback_list,
 579                                       const char *name,
 580                                       int (*fn)(void *arg), void *arg)
 581 {
 582         struct liblustre_wait_callback *llwc;
 583
 584         OBD_ALLOC(llwc, sizeof(*llwc));
 585         LASSERT (llwc != NULL);
 586
 587         llwc->llwc_name = name;
 588         llwc->llwc_fn = fn;
 589         llwc->llwc_arg = arg;
 590         cfs_list_add_tail(&llwc->llwc_list, callback_list);
 591
 592         return (llwc);
 593 }
 594
 595 void
 596 liblustre_deregister_waitidle_callback (void *opaque)
 597 {
 598         struct liblustre_wait_callback *llwc = opaque;
 599
 600         cfs_list_del(&llwc->llwc_list);
 601         OBD_FREE(llwc, sizeof(*llwc));
 602 }
 603
 604 void *
 605 liblustre_register_wait_callback (const char *name,
 606                                   int (*fn)(void *arg), void *arg)
 607 {
 608         return liblustre_register_waitidle_callback(&liblustre_wait_callbacks,
 609                                                     name, fn, arg);
 610 }
 611
 612 void
 613 liblustre_deregister_wait_callback (void *opaque)
 614 {
 615         liblustre_deregister_waitidle_callback(opaque);
 616 }
 617
 618 void *
 619 liblustre_register_idle_callback (const char *name,
 620                                   int (*fn)(void *arg), void *arg)
 621 {
 622         return liblustre_register_waitidle_callback(&liblustre_idle_callbacks,
 623                                                     name, fn, arg);
 624 }
 625
 626 void
 627 liblustre_deregister_idle_callback (void *opaque)
 628 {
 629         liblustre_deregister_waitidle_callback(opaque);
 630 }
 631
 632 int
 633 liblustre_check_events (int timeout)
 634 {
 635         lnet_event_t ev;
 636         int         rc;
 637         int         i;
 638         ENTRY;
 639
 640         rc = LNetEQPoll(&ptlrpc_eq_h, 1, timeout * 1000, &ev, &i);
 641         if (rc == 0)
 642                 RETURN(0);
 643
 644         LASSERT (rc == -EOVERFLOW || rc == 1);
 645
 646         /* liblustre: no asynch callback so we can't afford to miss any
 647          * events... */
 648         if (rc == -EOVERFLOW) {
 649                 CERROR ("Dropped an event!!!\n");
 650                 abort();
 651         }
 652
 653         ptlrpc_master_callback (&ev);
 654         RETURN(1);
 655 }
 656
 657 int liblustre_waiting = 0;
 658
 659 int
 660 liblustre_wait_event (int timeout)
 661 {
 662         cfs_list_t                     *tmp;
 663         struct liblustre_wait_callback *llwc;
 664         int                             found_something = 0;
 665
 666         /* single threaded recursion check... */
 667         liblustre_waiting = 1;
 668
 669         for (;;) {
 670                 /* Deal with all pending events */
 671                 while (liblustre_check_events(0))
 672                         found_something = 1;
 673
 674                 /* Give all registered callbacks a bite at the cherry */
 675                 cfs_list_for_each(tmp, &liblustre_wait_callbacks) {
 676                         llwc = cfs_list_entry(tmp,
 677                                               struct liblustre_wait_callback,
 678                                               llwc_list);
 679
 680                         if (llwc->llwc_fn(llwc->llwc_arg))
 681                                 found_something = 1;
 682                 }
 683
 684                 if (found_something || timeout == 0)
 685                         break;
 686
 687                 /* Nothing so far, but I'm allowed to block... */
 688                 found_something = liblustre_check_events(timeout);
 689                 if (!found_something)           /* still nothing */
 690                         break;                  /* I timed out */
 691         }
 692
 693         liblustre_waiting = 0;
 694
 695         return found_something;
 696 }
 697
 698 void
 699 liblustre_wait_idle(void)
 700 {
 701         static int recursed = 0;
 702
 703         cfs_list_t                     *tmp;
 704         struct liblustre_wait_callback *llwc;
 705         int                             idle = 0;
 706
 707         LASSERT(!recursed);
 708         recursed = 1;
 709
 710         do {
 711                 liblustre_wait_event(0);
 712
 713                 idle = 1;
 714
 715                 cfs_list_for_each(tmp, &liblustre_idle_callbacks) {
 716                         llwc = cfs_list_entry(tmp,
 717                                               struct liblustre_wait_callback,
 718                                               llwc_list);
 719
 720                         if (!llwc->llwc_fn(llwc->llwc_arg)) {
 721                                 idle = 0;
 722                                 break;
 723                         }
 724                 }
 725
 726         } while (!idle);
 727
 728         recursed = 0;
 729 }
 730
 731 #endif /* __KERNEL__ */
 732
 733 int ptlrpc_init_portals(void)
 734 {
 735         int   rc = ptlrpc_ni_init();
 736
 737         if (rc != 0) {
 738                 CERROR("network initialisation failed\n");
 739                 return -EIO;
 740         }
 741 #ifndef __KERNEL__
 742         liblustre_services_callback =
 743                 liblustre_register_wait_callback("liblustre_check_services",
 744                                                  &liblustre_check_services,
 745                                                  NULL);
 746         cfs_init_completion_module(liblustre_wait_event);
 747 #endif
 748         rc = ptlrpcd_addref();
 749         if (rc == 0)
 750                 return 0;
 751
 752         CERROR("rpcd initialisation failed\n");
 753 #ifndef __KERNEL__
 754         liblustre_deregister_wait_callback(liblustre_services_callback);
 755 #endif
 756         ptlrpc_ni_fini();
 757         return rc;
 758 }
 759
 760 void ptlrpc_exit_portals(void)
 761 {
 762 #ifndef __KERNEL__
 763         liblustre_deregister_wait_callback(liblustre_services_callback);
 764 #endif
 765         ptlrpcd_decref();
 766         ptlrpc_ni_fini();
 767 }