lustre/ptlrpc/service.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2002 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 #ifndef __KERNEL__
  28 #include <liblustre.h>
  29 #include <libcfs/kp30.h>
  30 #endif
  31 #include <obd_support.h>
  32 #include <obd_class.h>
  33 #include <lustre_net.h>
  34 #include <lnet/types.h>
  35 #include "ptlrpc_internal.h"
  36
  37 int test_req_buffer_pressure = 0;
  38 CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
  39                 "set non-zero to put pressure on request buffer pools");
  40
  41 /* forward ref */
  42 static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc);
  43
  44 static CFS_LIST_HEAD (ptlrpc_all_services);
  45 spinlock_t ptlrpc_all_services_lock;
  46
  47 static char *
  48 ptlrpc_alloc_request_buffer (int size)
  49 {
  50         char *ptr;
  51
  52         if (size > SVC_BUF_VMALLOC_THRESHOLD)
  53                 OBD_VMALLOC(ptr, size);
  54         else
  55                 OBD_ALLOC(ptr, size);
  56
  57         return (ptr);
  58 }
  59
  60 static void
  61 ptlrpc_free_request_buffer (char *ptr, int size)
  62 {
  63         if (size > SVC_BUF_VMALLOC_THRESHOLD)
  64                 OBD_VFREE(ptr, size);
  65         else
  66                 OBD_FREE(ptr, size);
  67 }
  68
  69 struct ptlrpc_request_buffer_desc *
  70 ptlrpc_alloc_rqbd (struct ptlrpc_service *svc)
  71 {
  72         struct ptlrpc_request_buffer_desc *rqbd;
  73
  74         OBD_ALLOC(rqbd, sizeof (*rqbd));
  75         if (rqbd == NULL)
  76                 return (NULL);
  77
  78         rqbd->rqbd_service = svc;
  79         rqbd->rqbd_refcount = 0;
  80         rqbd->rqbd_cbid.cbid_fn = request_in_callback;
  81         rqbd->rqbd_cbid.cbid_arg = rqbd;
  82         CFS_INIT_LIST_HEAD(&rqbd->rqbd_reqs);
  83         rqbd->rqbd_buffer = ptlrpc_alloc_request_buffer(svc->srv_buf_size);
  84
  85         if (rqbd->rqbd_buffer == NULL) {
  86                 OBD_FREE(rqbd, sizeof (*rqbd));
  87                 return (NULL);
  88         }
  89
  90         spin_lock(&svc->srv_lock);
  91         list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
  92         svc->srv_nbufs++;
  93         spin_unlock(&svc->srv_lock);
  94
  95         return (rqbd);
  96 }
  97
  98 void
  99 ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
 100 {
 101         struct ptlrpc_service *svc = rqbd->rqbd_service;
 102
 103         LASSERT (rqbd->rqbd_refcount == 0);
 104         LASSERT (list_empty(&rqbd->rqbd_reqs));
 105
 106         spin_lock(&svc->srv_lock);
 107         list_del(&rqbd->rqbd_list);
 108         svc->srv_nbufs--;
 109         spin_unlock(&svc->srv_lock);
 110
 111         ptlrpc_free_request_buffer (rqbd->rqbd_buffer, svc->srv_buf_size);
 112         OBD_FREE (rqbd, sizeof (*rqbd));
 113 }
 114
 115 int
 116 ptlrpc_grow_req_bufs(struct ptlrpc_service *svc)
 117 {
 118         struct ptlrpc_request_buffer_desc *rqbd;
 119         int                                i;
 120
 121         CDEBUG(D_RPCTRACE, "%s: allocate %d new %d-byte reqbufs (%d/%d left)\n",
 122                svc->srv_name, svc->srv_nbuf_per_group, svc->srv_buf_size,
 123                svc->srv_nrqbd_receiving, svc->srv_nbufs);
 124         for (i = 0; i < svc->srv_nbuf_per_group; i++) {
 125                 rqbd = ptlrpc_alloc_rqbd(svc);
 126
 127                 if (rqbd == NULL) {
 128                         CERROR ("%s: Can't allocate request buffer\n",
 129                                 svc->srv_name);
 130                         return (-ENOMEM);
 131                 }
 132
 133                 if (ptlrpc_server_post_idle_rqbds(svc) < 0)
 134                         return (-EAGAIN);
 135         }
 136
 137         return (0);
 138 }
 139
 140 void
 141 ptlrpc_save_lock (struct ptlrpc_request *req,
 142                   struct lustre_handle *lock, int mode)
 143 {
 144         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 145         int                        idx;
 146
 147         LASSERT(rs != NULL);
 148         LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
 149
 150         idx = rs->rs_nlocks++;
 151         rs->rs_locks[idx] = *lock;
 152         rs->rs_modes[idx] = mode;
 153         rs->rs_difficult = 1;
 154 }
 155
 156 void
 157 ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
 158 {
 159         struct ptlrpc_service *svc = rs->rs_service;
 160
 161 #ifdef CONFIG_SMP
 162         LASSERT (spin_is_locked (&svc->srv_lock));
 163 #endif
 164         LASSERT (rs->rs_difficult);
 165         rs->rs_scheduled_ever = 1;              /* flag any notification attempt */
 166
 167         if (rs->rs_scheduled)                   /* being set up or already notified */
 168                 return;
 169
 170         rs->rs_scheduled = 1;
 171         list_del (&rs->rs_list);
 172         list_add (&rs->rs_list, &svc->srv_reply_queue);
 173         cfs_waitq_signal (&svc->srv_waitq);
 174 }
 175
 176 void
 177 ptlrpc_commit_replies (struct obd_device *obd)
 178 {
 179         struct list_head   *tmp;
 180         struct list_head   *nxt;
 181
 182         /* Find any replies that have been committed and get their service
 183          * to attend to complete them. */
 184
 185         /* CAVEAT EMPTOR: spinlock ordering!!! */
 186         spin_lock(&obd->obd_uncommitted_replies_lock);
 187
 188         list_for_each_safe (tmp, nxt, &obd->obd_uncommitted_replies) {
 189                 struct ptlrpc_reply_state *rs =
 190                         list_entry(tmp, struct ptlrpc_reply_state, rs_obd_list);
 191
 192                 LASSERT (rs->rs_difficult);
 193
 194                 if (rs->rs_transno <= obd->obd_last_committed) {
 195                         struct ptlrpc_service *svc = rs->rs_service;
 196
 197                         spin_lock (&svc->srv_lock);
 198                         list_del_init (&rs->rs_obd_list);
 199                         ptlrpc_schedule_difficult_reply (rs);
 200                         spin_unlock (&svc->srv_lock);
 201                 }
 202         }
 203
 204         spin_unlock(&obd->obd_uncommitted_replies_lock);
 205 }
 206
 207 static int
 208 ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc)
 209 {
 210         struct ptlrpc_request_buffer_desc *rqbd;
 211         int                                rc;
 212         int                                posted = 0;
 213
 214         for (;;) {
 215                 spin_lock(&svc->srv_lock);
 216
 217                 if (list_empty (&svc->srv_idle_rqbds)) {
 218                         spin_unlock(&svc->srv_lock);
 219                         return (posted);
 220                 }
 221
 222                 rqbd = list_entry(svc->srv_idle_rqbds.next,
 223                                   struct ptlrpc_request_buffer_desc,
 224                                   rqbd_list);
 225                 list_del (&rqbd->rqbd_list);
 226
 227                 /* assume we will post successfully */
 228                 svc->srv_nrqbd_receiving++;
 229                 list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds);
 230
 231                 spin_unlock(&svc->srv_lock);
 232
 233                 rc = ptlrpc_register_rqbd(rqbd);
 234                 if (rc != 0)
 235                         break;
 236
 237                 posted = 1;
 238         }
 239
 240         spin_lock(&svc->srv_lock);
 241
 242         svc->srv_nrqbd_receiving--;
 243         list_del(&rqbd->rqbd_list);
 244         list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
 245
 246         /* Don't complain if no request buffers are posted right now; LNET
 247          * won't drop requests because we set the portal lazy! */
 248
 249         spin_unlock(&svc->srv_lock);
 250
 251         return (-1);
 252 }
 253
 254 /* @threadname should be 11 characters or less - 3 will be added on */
 255 struct ptlrpc_service *
 256 ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, int max_reply_size,
 257                 int req_portal, int rep_portal, int watchdog_timeout,
 258                 svc_handler_t handler, char *name,
 259                 cfs_proc_dir_entry_t *proc_entry,
 260                 svcreq_printfn_t svcreq_printfn,
 261                 int min_threads, int max_threads, char *threadname)
 262 {
 263         int                    rc;
 264         struct ptlrpc_service *service;
 265         ENTRY;
 266
 267         LASSERT (nbufs > 0);
 268         LASSERT (bufsize >= max_req_size);
 269
 270         OBD_ALLOC(service, sizeof(*service));
 271         if (service == NULL)
 272                 RETURN(NULL);
 273
 274         /* First initialise enough for early teardown */
 275
 276         service->srv_name = name;
 277         spin_lock_init(&service->srv_lock);
 278         CFS_INIT_LIST_HEAD(&service->srv_threads);
 279         cfs_waitq_init(&service->srv_waitq);
 280
 281         service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 : nbufs;
 282         service->srv_max_req_size = max_req_size;
 283         service->srv_buf_size = bufsize;
 284         service->srv_rep_portal = rep_portal;
 285         service->srv_req_portal = req_portal;
 286         service->srv_watchdog_timeout = watchdog_timeout;
 287         service->srv_handler = handler;
 288         service->srv_request_history_print_fn = svcreq_printfn;
 289         service->srv_request_seq = 1;           /* valid seq #s start at 1 */
 290         service->srv_request_max_cull_seq = 0;
 291         service->srv_threads_min = min_threads;
 292         service->srv_threads_max = max_threads;
 293         service->srv_thread_name = threadname;
 294
 295         rc = LNetSetLazyPortal(service->srv_req_portal);
 296         LASSERT (rc == 0);
 297
 298         CFS_INIT_LIST_HEAD(&service->srv_request_queue);
 299         CFS_INIT_LIST_HEAD(&service->srv_idle_rqbds);
 300         CFS_INIT_LIST_HEAD(&service->srv_active_rqbds);
 301         CFS_INIT_LIST_HEAD(&service->srv_history_rqbds);
 302         CFS_INIT_LIST_HEAD(&service->srv_request_history);
 303         CFS_INIT_LIST_HEAD(&service->srv_active_replies);
 304         CFS_INIT_LIST_HEAD(&service->srv_reply_queue);
 305         CFS_INIT_LIST_HEAD(&service->srv_free_rs_list);
 306         cfs_waitq_init(&service->srv_free_rs_waitq);
 307
 308         spin_lock (&ptlrpc_all_services_lock);
 309         list_add (&service->srv_list, &ptlrpc_all_services);
 310         spin_unlock (&ptlrpc_all_services_lock);
 311
 312         /* Now allocate the request buffers */
 313         rc = ptlrpc_grow_req_bufs(service);
 314         /* We shouldn't be under memory pressure at startup, so
 315          * fail if we can't post all our buffers at this time. */
 316         if (rc != 0)
 317                 GOTO(failed, NULL);
 318
 319         /* Now allocate pool of reply buffers */
 320         /* Increase max reply size to next power of two */
 321         service->srv_max_reply_size = 1;
 322         while (service->srv_max_reply_size < max_reply_size)
 323                 service->srv_max_reply_size <<= 1;
 324
 325         if (proc_entry != NULL)
 326                 ptlrpc_lprocfs_register_service(proc_entry, service);
 327
 328         CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
 329                service->srv_name, service->srv_req_portal);
 330
 331         RETURN(service);
 332 failed:
 333         ptlrpc_unregister_service(service);
 334         return NULL;
 335 }
 336
 337 static void __ptlrpc_server_free_request(struct ptlrpc_request *req)
 338 {
 339         struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
 340
 341         list_del(&req->rq_list);
 342
 343         if (req->rq_reply_state != NULL) {
 344                 ptlrpc_rs_decref(req->rq_reply_state);
 345                 req->rq_reply_state = NULL;
 346         }
 347
 348         if (req != &rqbd->rqbd_req) {
 349                 /* NB request buffers use an embedded
 350                  * req if the incoming req unlinked the
 351                  * MD; this isn't one of them! */
 352                 OBD_FREE(req, sizeof(*req));
 353         }
 354 }
 355
 356 static void
 357 ptlrpc_server_free_request(struct ptlrpc_request *req)
 358 {
 359         struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
 360         struct ptlrpc_service             *svc = rqbd->rqbd_service;
 361         int                                refcount;
 362         struct list_head                  *tmp;
 363         struct list_head                  *nxt;
 364
 365         spin_lock(&svc->srv_lock);
 366
 367         svc->srv_n_active_reqs--;
 368         list_add(&req->rq_list, &rqbd->rqbd_reqs);
 369
 370         refcount = --(rqbd->rqbd_refcount);
 371         if (refcount == 0) {
 372                 /* request buffer is now idle: add to history */
 373                 list_del(&rqbd->rqbd_list);
 374                 list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
 375                 svc->srv_n_history_rqbds++;
 376
 377                 /* cull some history?
 378                  * I expect only about 1 or 2 rqbds need to be recycled here */
 379                 while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
 380                         rqbd = list_entry(svc->srv_history_rqbds.next,
 381                                           struct ptlrpc_request_buffer_desc,
 382                                           rqbd_list);
 383
 384                         list_del(&rqbd->rqbd_list);
 385                         svc->srv_n_history_rqbds--;
 386
 387                         /* remove rqbd's reqs from svc's req history while
 388                          * I've got the service lock */
 389                         list_for_each(tmp, &rqbd->rqbd_reqs) {
 390                                 req = list_entry(tmp, struct ptlrpc_request,
 391                                                  rq_list);
 392                                 /* Track the highest culled req seq */
 393                                 if (req->rq_history_seq >
 394                                     svc->srv_request_max_cull_seq)
 395                                         svc->srv_request_max_cull_seq =
 396                                                 req->rq_history_seq;
 397                                 list_del(&req->rq_history_list);
 398                         }
 399
 400                         spin_unlock(&svc->srv_lock);
 401
 402                         list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
 403                                 req = list_entry(rqbd->rqbd_reqs.next,
 404                                                  struct ptlrpc_request,
 405                                                  rq_list);
 406                                 __ptlrpc_server_free_request(req);
 407                         }
 408
 409                         spin_lock(&svc->srv_lock);
 410
 411                         /* schedule request buffer for re-use.
 412                          * NB I can only do this after I've disposed of their
 413                          * reqs; particularly the embedded req */
 414                         list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
 415                 }
 416         } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
 417                  /* If we are low on memory, we are not interested in
 418                     history */
 419                 list_del(&req->rq_history_list);
 420                 __ptlrpc_server_free_request(req);
 421         }
 422
 423         spin_unlock(&svc->srv_lock);
 424
 425 }
 426
 427 /* This function makes sure dead exports are evicted in a timely manner.
 428    This function is only called when some export receives a message (i.e.,
 429    the network is up.) */
 430 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
 431 {
 432         struct obd_export *oldest_exp;
 433         time_t oldest_time;
 434
 435         ENTRY;
 436
 437         LASSERT(exp);
 438
 439         /* Compensate for slow machines, etc, by faking our request time
 440            into the future.  Although this can break the strict time-ordering
 441            of the list, we can be really lazy here - we don't have to evict
 442            at the exact right moment.  Eventually, all silent exports
 443            will make it to the top of the list. */
 444         exp->exp_last_request_time = max(exp->exp_last_request_time,
 445                                          (time_t)CURRENT_SECONDS + extra_delay);
 446
 447         CDEBUG(D_INFO, "updating export %s at %ld\n",
 448                exp->exp_client_uuid.uuid,
 449                exp->exp_last_request_time);
 450
 451         /* exports may get disconnected from the chain even though the
 452            export has references, so we must keep the spin lock while
 453            manipulating the lists */
 454         spin_lock(&exp->exp_obd->obd_dev_lock);
 455
 456         if (list_empty(&exp->exp_obd_chain_timed)) {
 457                 /* this one is not timed */
 458                 spin_unlock(&exp->exp_obd->obd_dev_lock);
 459                 EXIT;
 460                 return;
 461         }
 462
 463         list_move_tail(&exp->exp_obd_chain_timed,
 464                        &exp->exp_obd->obd_exports_timed);
 465
 466         oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
 467                                 struct obd_export, exp_obd_chain_timed);
 468         oldest_time = oldest_exp->exp_last_request_time;
 469         spin_unlock(&exp->exp_obd->obd_dev_lock);
 470
 471         if (exp->exp_obd->obd_recovering) {
 472                 /* be nice to everyone during recovery */
 473                 EXIT;
 474                 return;
 475         }
 476
 477         /* Note - racing to start/reset the obd_eviction timer is safe */
 478         if (exp->exp_obd->obd_eviction_timer == 0) {
 479                 /* Check if the oldest entry is expired. */
 480                 if (CURRENT_SECONDS > (oldest_time +
 481                                        (3 * obd_timeout / 2) + extra_delay)) {
 482                         /* We need a second timer, in case the net was down and
 483                          * it just came back. Since the pinger may skip every
 484                          * other PING_INTERVAL (see note in ptlrpc_pinger_main),
 485                          * we better wait for 3. */
 486                         exp->exp_obd->obd_eviction_timer = CURRENT_SECONDS +
 487                                 3 * PING_INTERVAL;
 488                         CDEBUG(D_HA, "%s: Think about evicting %s from %ld\n",
 489                                exp->exp_obd->obd_name, obd_export_nid2str(exp),
 490                                oldest_time);
 491                 }
 492         } else {
 493                 if (CURRENT_SECONDS > (exp->exp_obd->obd_eviction_timer +
 494                                        extra_delay)) {
 495                         /* The evictor won't evict anyone who we've heard from
 496                          * recently, so we don't have to check before we start
 497                          * it. */
 498                         if (!ping_evictor_wake(exp))
 499                                 exp->exp_obd->obd_eviction_timer = 0;
 500                 }
 501         }
 502
 503         EXIT;
 504 }
 505
 506 static int
 507 ptlrpc_server_handle_request(struct ptlrpc_service *svc,
 508                              struct ptlrpc_thread *thread)
 509 {
 510         struct obd_export     *export = NULL;
 511         struct ptlrpc_request *request;
 512         struct timeval         work_start;
 513         struct timeval         work_end;
 514         long                   timediff;
 515         int                    rc, reply;
 516         ENTRY;
 517
 518         LASSERT(svc);
 519
 520         spin_lock(&svc->srv_lock);
 521         if (list_empty (&svc->srv_request_queue) ||
 522             (svc->srv_n_difficult_replies != 0 &&
 523              svc->srv_n_active_reqs >= (svc->srv_threads_running - 1))) {
 524                 /* If all the other threads are handling requests, I must
 525                  * remain free to handle any 'difficult' reply that might
 526                  * block them */
 527                 spin_unlock(&svc->srv_lock);
 528                 RETURN(0);
 529         }
 530
 531         request = list_entry (svc->srv_request_queue.next,
 532                               struct ptlrpc_request, rq_list);
 533         list_del_init (&request->rq_list);
 534         svc->srv_n_queued_reqs--;
 535         svc->srv_n_active_reqs++;
 536
 537         spin_unlock(&svc->srv_lock);
 538
 539         do_gettimeofday(&work_start);
 540         timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
 541         if (svc->srv_stats != NULL) {
 542                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
 543                                     timediff);
 544                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
 545                                     svc->srv_n_queued_reqs);
 546                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
 547                                     svc->srv_n_active_reqs);
 548         }
 549
 550 #if SWAB_PARANOIA
 551         /* Clear request swab mask; this is a new request */
 552         request->rq_req_swab_mask = 0;
 553 #endif
 554         rc = lustre_unpack_msg(request->rq_reqmsg, request->rq_reqlen);
 555         if (rc != 0) {
 556                 CERROR ("error unpacking request: ptl %d from %s"
 557                         " xid "LPU64"\n", svc->srv_req_portal,
 558                         libcfs_id2str(request->rq_peer), request->rq_xid);
 559                 goto out;
 560         }
 561
 562         rc = lustre_unpack_req_ptlrpc_body(request, MSG_PTLRPC_BODY_OFF);
 563         if (rc) {
 564                 CERROR ("error unpacking ptlrpc body: ptl %d from %s"
 565                         " xid "LPU64"\n", svc->srv_req_portal,
 566                         libcfs_id2str(request->rq_peer), request->rq_xid);
 567                 goto out;
 568         }
 569
 570         rc = -EINVAL;
 571         if (lustre_msg_get_type(request->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
 572                 CERROR("wrong packet type received (type=%u) from %s\n",
 573                        lustre_msg_get_type(request->rq_reqmsg),
 574                        libcfs_id2str(request->rq_peer));
 575                 goto out;
 576         }
 577
 578         CDEBUG(D_NET, "got req "LPD64"\n", request->rq_xid);
 579
 580         request->rq_svc_thread = thread;
 581         request->rq_export = class_conn2export(
 582                                      lustre_msg_get_handle(request->rq_reqmsg));
 583
 584         if (request->rq_export) {
 585                 if (lustre_msg_get_conn_cnt(request->rq_reqmsg) <
 586                     request->rq_export->exp_conn_cnt) {
 587                         DEBUG_REQ(D_ERROR, request,
 588                                   "DROPPING req from old connection %d < %d",
 589                                   lustre_msg_get_conn_cnt(request->rq_reqmsg),
 590                                   request->rq_export->exp_conn_cnt);
 591                         goto put_conn;
 592                 }
 593                 if (request->rq_export->exp_obd &&
 594                     request->rq_export->exp_obd->obd_fail) {
 595                         /* Failing over, don't handle any more reqs, send
 596                            error response instead. */
 597                         CDEBUG(D_HA, "Dropping req %p for failed obd %s\n",
 598                                request, request->rq_export->exp_obd->obd_name);
 599                         request->rq_status = -ENODEV;
 600                         ptlrpc_error(request);
 601                         goto put_conn;
 602                 }
 603
 604                 ptlrpc_update_export_timer(request->rq_export, timediff/500000);
 605                 export = class_export_rpc_get(request->rq_export);
 606         }
 607
 608         /* Discard requests queued for longer than my timeout.  If the
 609          * client's timeout is similar to mine, she'll be timing out this
 610          * REQ anyway (bug 1502) */
 611         if (timediff / 1000000 > (long)obd_timeout) {
 612                 CERROR("Dropping timed-out opc %d request from %s"
 613                        ": %ld seconds old\n",
 614                        lustre_msg_get_opc(request->rq_reqmsg),
 615                        libcfs_id2str(request->rq_peer),
 616                        timediff / 1000000);
 617                 goto put_rpc_export;
 618         }
 619
 620         request->rq_phase = RQ_PHASE_INTERPRET;
 621
 622         CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
 623                "%s:%s+%d:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 624                (request->rq_export ?
 625                 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
 626                (request->rq_export ?
 627                 atomic_read(&request->rq_export->exp_refcount) : -99),
 628                lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
 629                libcfs_id2str(request->rq_peer),
 630                lustre_msg_get_opc(request->rq_reqmsg));
 631
 632         rc = svc->srv_handler(request);
 633
 634         request->rq_phase = RQ_PHASE_COMPLETE;
 635
 636         CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
 637                "%s:%s+%d:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 638                (request->rq_export ?
 639                 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
 640                (request->rq_export ?
 641                 atomic_read(&request->rq_export->exp_refcount) : -99),
 642                lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
 643                libcfs_id2str(request->rq_peer),
 644                lustre_msg_get_opc(request->rq_reqmsg));
 645
 646 put_rpc_export:
 647         if (export != NULL)
 648                 class_export_rpc_put(export);
 649
 650 put_conn:
 651         if (request->rq_export != NULL)
 652                 class_export_put(request->rq_export);
 653
 654 out:
 655         reply = request->rq_reply_state && request->rq_repmsg;  /* bug 11169 */
 656
 657         do_gettimeofday(&work_end);
 658         timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
 659         if (timediff / 1000000 > (long)obd_timeout)
 660                 CERROR("request "LPU64" opc %u from %s processed in %lds "
 661                        "trans "LPU64" rc %d/%d\n",
 662                        request->rq_xid, lustre_msg_get_opc(request->rq_reqmsg),
 663                        libcfs_id2str(request->rq_peer),
 664                        cfs_timeval_sub(&work_end, &request->rq_arrival_time,
 665                                        NULL) / 1000000,
 666                        reply ? lustre_msg_get_transno(request->rq_repmsg) :
 667                                request->rq_transno,
 668                        request->rq_status,
 669                        reply ? lustre_msg_get_status(request->rq_repmsg): -999);
 670         else
 671                 CDEBUG(D_HA, "request "LPU64" opc %u from %s processed in "
 672                        "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
 673                        request->rq_xid, lustre_msg_get_opc(request->rq_reqmsg),
 674                        libcfs_id2str(request->rq_peer), timediff,
 675                        cfs_timeval_sub(&work_end, &request->rq_arrival_time,
 676                                        NULL),
 677                        request->rq_transno, request->rq_status,
 678                        reply ? lustre_msg_get_status(request->rq_repmsg): -999);
 679
 680         if (svc->srv_stats != NULL) {
 681                 int opc = opcode_offset(lustre_msg_get_opc(request->rq_reqmsg));
 682                 if (opc > 0) {
 683                         LASSERT(opc < LUSTRE_MAX_OPCODES);
 684                         lprocfs_counter_add(svc->srv_stats,
 685                                             opc + PTLRPC_LAST_CNTR,
 686                                             timediff);
 687                 }
 688         }
 689
 690         ptlrpc_server_free_request(request);
 691
 692         RETURN(1);
 693 }
 694
 695 static int
 696 ptlrpc_server_handle_reply (struct ptlrpc_service *svc)
 697 {
 698         struct ptlrpc_reply_state *rs;
 699         struct obd_export         *exp;
 700         struct obd_device         *obd;
 701         int                        nlocks;
 702         int                        been_handled;
 703         ENTRY;
 704
 705         spin_lock(&svc->srv_lock);
 706         if (list_empty (&svc->srv_reply_queue)) {
 707                 spin_unlock(&svc->srv_lock);
 708                 RETURN(0);
 709         }
 710
 711         rs = list_entry (svc->srv_reply_queue.next,
 712                          struct ptlrpc_reply_state, rs_list);
 713
 714         exp = rs->rs_export;
 715         obd = exp->exp_obd;
 716
 717         LASSERT (rs->rs_difficult);
 718         LASSERT (rs->rs_scheduled);
 719
 720         list_del_init (&rs->rs_list);
 721
 722         /* Disengage from notifiers carefully (lock order - irqrestore below!)*/
 723         spin_unlock(&svc->srv_lock);
 724
 725         spin_lock (&obd->obd_uncommitted_replies_lock);
 726         /* Noop if removed already */
 727         list_del_init (&rs->rs_obd_list);
 728         spin_unlock (&obd->obd_uncommitted_replies_lock);
 729
 730         spin_lock (&exp->exp_lock);
 731         /* Noop if removed already */
 732         list_del_init (&rs->rs_exp_list);
 733         spin_unlock (&exp->exp_lock);
 734
 735         spin_lock(&svc->srv_lock);
 736
 737         been_handled = rs->rs_handled;
 738         rs->rs_handled = 1;
 739
 740         nlocks = rs->rs_nlocks;                 /* atomic "steal", but */
 741         rs->rs_nlocks = 0;                      /* locks still on rs_locks! */
 742
 743         if (nlocks == 0 && !been_handled) {
 744                 /* If we see this, we should already have seen the warning
 745                  * in mds_steal_ack_locks()  */
 746                 CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
 747                       " o%d NID %s\n",
 748                       rs,
 749                       rs->rs_xid, rs->rs_transno,
 750                       lustre_msg_get_opc(rs->rs_msg),
 751                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
 752         }
 753
 754         if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
 755                 spin_unlock(&svc->srv_lock);
 756
 757                 if (!been_handled && rs->rs_on_net) {
 758                         LNetMDUnlink(rs->rs_md_h);
 759                         /* Ignore return code; we're racing with
 760                          * completion... */
 761                 }
 762
 763                 while (nlocks-- > 0)
 764                         ldlm_lock_decref(&rs->rs_locks[nlocks],
 765                                          rs->rs_modes[nlocks]);
 766
 767                 spin_lock(&svc->srv_lock);
 768         }
 769
 770         rs->rs_scheduled = 0;
 771
 772         if (!rs->rs_on_net) {
 773                 /* Off the net */
 774                 svc->srv_n_difficult_replies--;
 775                 spin_unlock(&svc->srv_lock);
 776
 777                 class_export_put (exp);
 778                 rs->rs_export = NULL;
 779                 ptlrpc_rs_decref (rs);
 780                 atomic_dec (&svc->srv_outstanding_replies);
 781                 RETURN(1);
 782         }
 783
 784         /* still on the net; callback will schedule */
 785         spin_unlock(&svc->srv_lock);
 786         RETURN(1);
 787 }
 788
 789 #ifndef __KERNEL__
 790 /* FIXME make use of timeout later */
 791 int
 792 liblustre_check_services (void *arg)
 793 {
 794         int  did_something = 0;
 795         int  rc;
 796         struct list_head *tmp, *nxt;
 797         ENTRY;
 798
 799         /* I'm relying on being single threaded, not to have to lock
 800          * ptlrpc_all_services etc */
 801         list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
 802                 struct ptlrpc_service *svc =
 803                         list_entry (tmp, struct ptlrpc_service, srv_list);
 804
 805                 if (svc->srv_threads_running != 0)     /* I've recursed */
 806                         continue;
 807
 808                 /* service threads can block for bulk, so this limits us
 809                  * (arbitrarily) to recursing 1 stack frame per service.
 810                  * Note that the problem with recursion is that we have to
 811                  * unwind completely before our caller can resume. */
 812
 813                 svc->srv_threads_running++;
 814
 815                 do {
 816                         rc = ptlrpc_server_handle_reply(svc);
 817                         rc |= ptlrpc_server_handle_request(svc, NULL);
 818                         rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
 819                         did_something |= rc;
 820                 } while (rc);
 821
 822                 svc->srv_threads_running--;
 823         }
 824
 825         RETURN(did_something);
 826 }
 827 #define ptlrpc_stop_all_threads(s) do {} while (0)
 828
 829 #else /* __KERNEL__ */
 830
 831 /* Don't use daemonize, it removes fs struct from new thread (bug 418) */
 832 void ptlrpc_daemonize(char *name)
 833 {
 834         struct fs_struct *fs = current->fs;
 835
 836         atomic_inc(&fs->count);
 837         cfs_daemonize(name);
 838         exit_fs(cfs_current());
 839         current->fs = fs;
 840         ll_set_fs_pwd(current->fs, init_task.fs->pwdmnt, init_task.fs->pwd);
 841 }
 842
 843 static void
 844 ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
 845 {
 846         int avail = svc->srv_nrqbd_receiving;
 847         int low_water = test_req_buffer_pressure ? 0 :
 848                         svc->srv_nbuf_per_group/2;
 849
 850         /* NB I'm not locking; just looking. */
 851
 852         /* CAVEAT EMPTOR: We might be allocating buffers here because we've
 853          * allowed the request history to grow out of control.  We could put a
 854          * sanity check on that here and cull some history if we need the
 855          * space. */
 856
 857         if (avail <= low_water)
 858                 ptlrpc_grow_req_bufs(svc);
 859
 860         if (svc->srv_stats)
 861                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
 862                                     avail);
 863 }
 864
 865 static int
 866 ptlrpc_retry_rqbds(void *arg)
 867 {
 868         struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
 869
 870         svc->srv_rqbd_timeout = 0;
 871         return (-ETIMEDOUT);
 872 }
 873
 874 static int ptlrpc_main(void *arg)
 875 {
 876         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 877         struct ptlrpc_service  *svc = data->svc;
 878         struct ptlrpc_thread   *thread = data->thread;
 879         struct obd_device      *dev = data->dev;
 880         struct ptlrpc_reply_state *rs;
 881         struct lc_watchdog     *watchdog;
 882 #ifdef WITH_GROUP_INFO
 883         struct group_info *ginfo = NULL;
 884 #endif
 885         int rc = 0;
 886         ENTRY;
 887
 888         ptlrpc_daemonize(data->name);
 889
 890 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,9) && defined(CONFIG_NUMA)
 891         /* we need to do this before any per-thread allocation is done so that
 892          * we get the per-thread allocations on local node.  bug 7342 */
 893         if (svc->srv_cpu_affinity) {
 894                 int cpu, num_cpu;
 895
 896                 for (cpu = 0, num_cpu = 0; cpu < NR_CPUS; cpu++) {
 897                         if (!cpu_online(cpu))
 898                                 continue;
 899                         if (num_cpu == thread->t_id % num_online_cpus())
 900                                 break;
 901                         num_cpu++;
 902                 }
 903                 set_cpus_allowed(cfs_current(), node_to_cpumask(cpu_to_node(cpu)));
 904         }
 905 #endif
 906
 907 #ifdef WITH_GROUP_INFO
 908         ginfo = groups_alloc(0);
 909         if (!ginfo) {
 910                 rc = -ENOMEM;
 911                 goto out;
 912         }
 913
 914         set_current_groups(ginfo);
 915         put_group_info(ginfo);
 916 #endif
 917
 918         if (svc->srv_init != NULL) {
 919                 rc = svc->srv_init(thread);
 920                 if (rc)
 921                         goto out;
 922         }
 923
 924         /* Alloc reply state structure for this one */
 925         OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
 926         if (!rs) {
 927                 rc = -ENOMEM;
 928                 goto out_srv_init;
 929         }
 930
 931         /* Record that the thread is running */
 932         thread->t_flags = SVC_RUNNING;
 933         /*
 934          * wake up our creator. Note: @data is invalid after this point,
 935          * because it's allocated on ptlrpc_start_thread() stack.
 936          */
 937         cfs_waitq_signal(&thread->t_ctl_waitq);
 938
 939         watchdog = lc_watchdog_add(svc->srv_watchdog_timeout, NULL, NULL);
 940
 941         spin_lock(&svc->srv_lock);
 942         svc->srv_threads_running++;
 943         list_add(&rs->rs_list, &svc->srv_free_rs_list);
 944         spin_unlock(&svc->srv_lock);
 945         cfs_waitq_signal(&svc->srv_free_rs_waitq);
 946
 947         CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
 948                svc->srv_threads_running);
 949
 950         /* XXX maintain a list of all managed devices: insert here */
 951
 952         while ((thread->t_flags & SVC_STOPPING) == 0 ||
 953                svc->srv_n_difficult_replies != 0) {
 954                 /* Don't exit while there are replies to be handled */
 955                 struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
 956                                                      ptlrpc_retry_rqbds, svc);
 957
 958                 lc_watchdog_disable(watchdog);
 959
 960                 l_wait_event_exclusive (svc->srv_waitq,
 961                               ((thread->t_flags & SVC_STOPPING) != 0 &&
 962                                svc->srv_n_difficult_replies == 0) ||
 963                               (!list_empty(&svc->srv_idle_rqbds) &&
 964                                svc->srv_rqbd_timeout == 0) ||
 965                               !list_empty (&svc->srv_reply_queue) ||
 966                               (!list_empty (&svc->srv_request_queue) &&
 967                                (svc->srv_n_difficult_replies == 0 ||
 968                                 svc->srv_n_active_reqs <
 969                                 (svc->srv_threads_running - 1))),
 970                               &lwi);
 971
 972                 lc_watchdog_touch(watchdog);
 973
 974                 ptlrpc_check_rqbd_pool(svc);
 975
 976                 if ((svc->srv_threads_started < svc->srv_threads_max) &&
 977                     (svc->srv_n_active_reqs >= (svc->srv_threads_started - 1))){
 978                         /* Ignore return code - we tried... */
 979                         ptlrpc_start_thread(dev, svc);
 980                 }
 981
 982                 if (!list_empty (&svc->srv_reply_queue))
 983                         ptlrpc_server_handle_reply (svc);
 984
 985                 /* only handle requests if there are no difficult replies
 986                  * outstanding, or I'm not the last thread handling
 987                  * requests */
 988                 if (!list_empty (&svc->srv_request_queue) &&
 989                     (svc->srv_n_difficult_replies == 0 ||
 990                      svc->srv_n_active_reqs < (svc->srv_threads_running - 1)))
 991                         ptlrpc_server_handle_request(svc, thread);
 992
 993                 if (!list_empty(&svc->srv_idle_rqbds) &&
 994                     ptlrpc_server_post_idle_rqbds(svc) < 0) {
 995                         /* I just failed to repost request buffers.  Wait
 996                          * for a timeout (unless something else happens)
 997                          * before I try again */
 998                         svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
 999                         CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
1000                                svc->srv_nrqbd_receiving);
1001                 }
1002         }
1003
1004         lc_watchdog_delete(watchdog);
1005
1006 out_srv_init:
1007         /*
1008          * deconstruct service specific state created by ptlrpc_start_thread()
1009          */
1010         if (svc->srv_done != NULL)
1011                 svc->srv_done(thread);
1012
1013 out:
1014         CDEBUG(D_NET, "service thread %d exiting: rc %d\n", thread->t_id, rc);
1015
1016         spin_lock(&svc->srv_lock);
1017         svc->srv_threads_running--;              /* must know immediately */
1018         thread->t_id = rc;
1019         thread->t_flags = SVC_STOPPED;
1020
1021         cfs_waitq_signal(&thread->t_ctl_waitq);
1022         spin_unlock(&svc->srv_lock);
1023
1024         return rc;
1025 }
1026
1027 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
1028                                struct ptlrpc_thread *thread)
1029 {
1030         struct l_wait_info lwi = { 0 };
1031
1032         spin_lock(&svc->srv_lock);
1033         thread->t_flags = SVC_STOPPING;
1034         spin_unlock(&svc->srv_lock);
1035
1036         cfs_waitq_broadcast(&svc->srv_waitq);
1037         l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED),
1038                      &lwi);
1039
1040         spin_lock(&svc->srv_lock);
1041         list_del(&thread->t_link);
1042         spin_unlock(&svc->srv_lock);
1043
1044         OBD_FREE(thread, sizeof(*thread));
1045 }
1046
1047 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
1048 {
1049         struct ptlrpc_thread *thread;
1050
1051         spin_lock(&svc->srv_lock);
1052         while (!list_empty(&svc->srv_threads)) {
1053                 thread = list_entry(svc->srv_threads.next,
1054                                     struct ptlrpc_thread, t_link);
1055
1056                 spin_unlock(&svc->srv_lock);
1057                 ptlrpc_stop_thread(svc, thread);
1058                 spin_lock(&svc->srv_lock);
1059         }
1060
1061         spin_unlock(&svc->srv_lock);
1062 }
1063
1064 int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc)
1065 {
1066         int i, rc = 0;
1067         ENTRY;
1068
1069         LASSERT(svc->srv_threads_min > 0);
1070         for (i = 0; i < svc->srv_threads_min; i++) {
1071                 rc = ptlrpc_start_thread(dev, svc);
1072                 if (rc) {
1073                         CERROR("cannot start %s thread #%d: rc %d\n",
1074                                svc->srv_thread_name, i, rc);
1075                         ptlrpc_stop_all_threads(svc);
1076                 }
1077         }
1078         RETURN(rc);
1079 }
1080
1081 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc)
1082 {
1083         struct l_wait_info lwi = { 0 };
1084         struct ptlrpc_svc_data d;
1085         struct ptlrpc_thread *thread;
1086         char name[32];
1087         int id, rc;
1088         ENTRY;
1089
1090         CDEBUG(D_RPCTRACE, "%s started %d min %d max %d running %d\n",
1091                svc->srv_name, svc->srv_threads_started, svc->srv_threads_min,
1092                svc->srv_threads_max, svc->srv_threads_running);
1093         if (svc->srv_threads_started >= svc->srv_threads_max)
1094                 RETURN(-EMFILE);
1095
1096         OBD_ALLOC(thread, sizeof(*thread));
1097         if (thread == NULL)
1098                 RETURN(-ENOMEM);
1099         cfs_waitq_init(&thread->t_ctl_waitq);
1100
1101         spin_lock(&svc->srv_lock);
1102         if (svc->srv_threads_started >= svc->srv_threads_max) {
1103                 spin_unlock(&svc->srv_lock);
1104                 OBD_FREE(thread, sizeof(*thread));
1105                 RETURN(-EMFILE);
1106         }
1107         list_add(&thread->t_link, &svc->srv_threads);
1108         id = ++svc->srv_threads_started;
1109         spin_unlock(&svc->srv_lock);
1110
1111         thread->t_id = id;
1112         sprintf(name, "%s_%02d", svc->srv_thread_name, id);
1113         d.dev = dev;
1114         d.svc = svc;
1115         d.name = name;
1116         d.thread = thread;
1117
1118         CDEBUG(D_RPCTRACE, "starting thread '%s'\n", name);
1119
1120         /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
1121          * just drop the VM and FILES in ptlrpc_daemonize() right away.
1122          */
1123         rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
1124         if (rc < 0) {
1125                 CERROR("cannot start thread '%s': rc %d\n", name, rc);
1126
1127                 spin_lock(&svc->srv_lock);
1128                 list_del(&thread->t_link);
1129                 --svc->srv_threads_started;
1130                 spin_unlock(&svc->srv_lock);
1131
1132                 OBD_FREE(thread, sizeof(*thread));
1133                 RETURN(rc);
1134         }
1135         l_wait_event(thread->t_ctl_waitq,
1136                      thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
1137
1138         rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
1139         RETURN(rc);
1140 }
1141 #endif
1142
1143 int ptlrpc_unregister_service(struct ptlrpc_service *service)
1144 {
1145         int                   rc;
1146         struct l_wait_info    lwi;
1147         struct list_head     *tmp;
1148         struct ptlrpc_reply_state *rs, *t;
1149
1150         ptlrpc_stop_all_threads(service);
1151         LASSERT(list_empty(&service->srv_threads));
1152
1153         spin_lock (&ptlrpc_all_services_lock);
1154         list_del_init (&service->srv_list);
1155         spin_unlock (&ptlrpc_all_services_lock);
1156
1157         ptlrpc_lprocfs_unregister_service(service);
1158
1159         /* All history will be culled when the next request buffer is
1160          * freed */
1161         service->srv_max_history_rqbds = 0;
1162
1163         CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
1164
1165         rc = LNetClearLazyPortal(service->srv_req_portal);
1166         LASSERT (rc == 0);
1167
1168         /* Unlink all the request buffers.  This forces a 'final' event with
1169          * its 'unlink' flag set for each posted rqbd */
1170         list_for_each(tmp, &service->srv_active_rqbds) {
1171                 struct ptlrpc_request_buffer_desc *rqbd =
1172                         list_entry(tmp, struct ptlrpc_request_buffer_desc,
1173                                    rqbd_list);
1174
1175                 rc = LNetMDUnlink(rqbd->rqbd_md_h);
1176                 LASSERT (rc == 0 || rc == -ENOENT);
1177         }
1178
1179         /* Wait for the network to release any buffers it's currently
1180          * filling */
1181         for (;;) {
1182                 spin_lock(&service->srv_lock);
1183                 rc = service->srv_nrqbd_receiving;
1184                 spin_unlock(&service->srv_lock);
1185
1186                 if (rc == 0)
1187                         break;
1188
1189                 /* Network access will complete in finite time but the HUGE
1190                  * timeout lets us CWARN for visibility of sluggish NALs */
1191                 lwi = LWI_TIMEOUT(cfs_time_seconds(300), NULL, NULL);
1192                 rc = l_wait_event(service->srv_waitq,
1193                                   service->srv_nrqbd_receiving == 0,
1194                                   &lwi);
1195                 if (rc == -ETIMEDOUT)
1196                         CWARN("Service %s waiting for request buffers\n",
1197                               service->srv_name);
1198         }
1199
1200         /* schedule all outstanding replies to terminate them */
1201         spin_lock(&service->srv_lock);
1202         while (!list_empty(&service->srv_active_replies)) {
1203                 struct ptlrpc_reply_state *rs =
1204                         list_entry(service->srv_active_replies.next,
1205                                    struct ptlrpc_reply_state, rs_list);
1206                 ptlrpc_schedule_difficult_reply(rs);
1207         }
1208         spin_unlock(&service->srv_lock);
1209
1210         /* purge the request queue.  NB No new replies (rqbds all unlinked)
1211          * and no service threads, so I'm the only thread noodling the
1212          * request queue now */
1213         while (!list_empty(&service->srv_request_queue)) {
1214                 struct ptlrpc_request *req =
1215                         list_entry(service->srv_request_queue.next,
1216                                    struct ptlrpc_request,
1217                                    rq_list);
1218
1219                 list_del(&req->rq_list);
1220                 service->srv_n_queued_reqs--;
1221                 service->srv_n_active_reqs++;
1222
1223                 ptlrpc_server_free_request(req);
1224         }
1225         LASSERT(service->srv_n_queued_reqs == 0);
1226         LASSERT(service->srv_n_active_reqs == 0);
1227         LASSERT(service->srv_n_history_rqbds == 0);
1228         LASSERT(list_empty(&service->srv_active_rqbds));
1229
1230         /* Now free all the request buffers since nothing references them
1231          * any more... */
1232         while (!list_empty(&service->srv_idle_rqbds)) {
1233                 struct ptlrpc_request_buffer_desc *rqbd =
1234                         list_entry(service->srv_idle_rqbds.next,
1235                                    struct ptlrpc_request_buffer_desc,
1236                                    rqbd_list);
1237
1238                 ptlrpc_free_rqbd(rqbd);
1239         }
1240
1241         /* wait for all outstanding replies to complete (they were
1242          * scheduled having been flagged to abort above) */
1243         while (atomic_read(&service->srv_outstanding_replies) != 0) {
1244                 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10), NULL, NULL);
1245
1246                 rc = l_wait_event(service->srv_waitq,
1247                                   !list_empty(&service->srv_reply_queue), &lwi);
1248                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
1249
1250                 if (rc == 0) {
1251                         ptlrpc_server_handle_reply(service);
1252                         continue;
1253                 }
1254                 CWARN("Unexpectedly long timeout %p\n", service);
1255         }
1256
1257         list_for_each_entry_safe(rs, t, &service->srv_free_rs_list, rs_list) {
1258                 list_del(&rs->rs_list);
1259                 OBD_FREE(rs, service->srv_max_reply_size);
1260         }
1261
1262         OBD_FREE(service, sizeof(*service));
1263         return 0;
1264 }
1265
1266 /* Returns 0 if the service is healthy.
1267  *
1268  * Right now, it just checks to make sure that requests aren't languishing
1269  * in the queue.  We'll use this health check to govern whether a node needs
1270  * to be shot, so it's intentionally non-aggressive. */
1271 int ptlrpc_service_health_check(struct ptlrpc_service *svc)
1272 {
1273         struct ptlrpc_request *request;
1274         struct timeval         right_now;
1275         long                   timediff, cutoff;
1276         int                    rc = 0;
1277
1278         if (svc == NULL)
1279                 return 0;
1280
1281         spin_lock(&svc->srv_lock);
1282
1283         if (list_empty(&svc->srv_request_queue))
1284                 goto out;
1285
1286         request = list_entry(svc->srv_request_queue.next,
1287                              struct ptlrpc_request, rq_list);
1288
1289         do_gettimeofday(&right_now);
1290         timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
1291
1292         cutoff = obd_health_check_timeout;
1293
1294         if (timediff / 1000000 > cutoff) {
1295                 rc = -1;
1296                 goto out;
1297         }
1298
1299  out:
1300         spin_unlock(&svc->srv_lock);
1301         return rc;
1302 }