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 <lu_object.h>
  35 #include <lnet/types.h>
  36 #include "ptlrpc_internal.h"
  37
  38 int test_req_buffer_pressure = 0;
  39 CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
  40                 "set non-zero to put pressure on request buffer pools");
  41
  42 /* forward ref */
  43 static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc);
  44
  45 static CFS_LIST_HEAD (ptlrpc_all_services);
  46 spinlock_t ptlrpc_all_services_lock;
  47
  48 static char *
  49 ptlrpc_alloc_request_buffer (int size)
  50 {
  51         char *ptr;
  52
  53         if (size > SVC_BUF_VMALLOC_THRESHOLD)
  54                 OBD_VMALLOC(ptr, size);
  55         else
  56                 OBD_ALLOC(ptr, size);
  57
  58         return (ptr);
  59 }
  60
  61 static void
  62 ptlrpc_free_request_buffer (char *ptr, int size)
  63 {
  64         if (size > SVC_BUF_VMALLOC_THRESHOLD)
  65                 OBD_VFREE(ptr, size);
  66         else
  67                 OBD_FREE(ptr, size);
  68 }
  69
  70 struct ptlrpc_request_buffer_desc *
  71 ptlrpc_alloc_rqbd (struct ptlrpc_service *svc)
  72 {
  73         struct ptlrpc_request_buffer_desc *rqbd;
  74
  75         OBD_ALLOC(rqbd, sizeof (*rqbd));
  76         if (rqbd == NULL)
  77                 return (NULL);
  78
  79         rqbd->rqbd_service = svc;
  80         rqbd->rqbd_refcount = 0;
  81         rqbd->rqbd_cbid.cbid_fn = request_in_callback;
  82         rqbd->rqbd_cbid.cbid_arg = rqbd;
  83         CFS_INIT_LIST_HEAD(&rqbd->rqbd_reqs);
  84         rqbd->rqbd_buffer = ptlrpc_alloc_request_buffer(svc->srv_buf_size);
  85
  86         if (rqbd->rqbd_buffer == NULL) {
  87                 OBD_FREE(rqbd, sizeof (*rqbd));
  88                 return (NULL);
  89         }
  90
  91         spin_lock(&svc->srv_lock);
  92         list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
  93         svc->srv_nbufs++;
  94         spin_unlock(&svc->srv_lock);
  95
  96         return (rqbd);
  97 }
  98
  99 void
 100 ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
 101 {
 102         struct ptlrpc_service *svc = rqbd->rqbd_service;
 103
 104         LASSERT (rqbd->rqbd_refcount == 0);
 105         LASSERT (list_empty(&rqbd->rqbd_reqs));
 106
 107         spin_lock(&svc->srv_lock);
 108         list_del(&rqbd->rqbd_list);
 109         svc->srv_nbufs--;
 110         spin_unlock(&svc->srv_lock);
 111
 112         ptlrpc_free_request_buffer (rqbd->rqbd_buffer, svc->srv_buf_size);
 113         OBD_FREE (rqbd, sizeof (*rqbd));
 114 }
 115
 116 int
 117 ptlrpc_grow_req_bufs(struct ptlrpc_service *svc)
 118 {
 119         struct ptlrpc_request_buffer_desc *rqbd;
 120         int                                i;
 121
 122         CDEBUG(D_RPCTRACE, "%s: allocate %d new %d-byte reqbufs (%d/%d left)\n",
 123                svc->srv_name, svc->srv_nbuf_per_group, svc->srv_buf_size,
 124                svc->srv_nrqbd_receiving, svc->srv_nbufs);
 125         for (i = 0; i < svc->srv_nbuf_per_group; i++) {
 126                 rqbd = ptlrpc_alloc_rqbd(svc);
 127
 128                 if (rqbd == NULL) {
 129                         CERROR ("%s: Can't allocate request buffer\n",
 130                                 svc->srv_name);
 131                         return (-ENOMEM);
 132                 }
 133
 134                 if (ptlrpc_server_post_idle_rqbds(svc) < 0)
 135                         return (-EAGAIN);
 136         }
 137
 138         return (0);
 139 }
 140
 141 void
 142 ptlrpc_save_lock (struct ptlrpc_request *req,
 143                   struct lustre_handle *lock, int mode)
 144 {
 145         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 146         int                        idx;
 147
 148         LASSERT(rs != NULL);
 149         LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
 150
 151         idx = rs->rs_nlocks++;
 152         rs->rs_locks[idx] = *lock;
 153         rs->rs_modes[idx] = mode;
 154         rs->rs_difficult = 1;
 155 }
 156
 157 void
 158 ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
 159 {
 160         struct ptlrpc_service *svc = rs->rs_service;
 161
 162 #ifdef CONFIG_SMP
 163         LASSERT (spin_is_locked (&svc->srv_lock));
 164 #endif
 165         LASSERT (rs->rs_difficult);
 166         rs->rs_scheduled_ever = 1;              /* flag any notification attempt */
 167
 168         if (rs->rs_scheduled)                   /* being set up or already notified */
 169                 return;
 170
 171         rs->rs_scheduled = 1;
 172         list_del (&rs->rs_list);
 173         list_add (&rs->rs_list, &svc->srv_reply_queue);
 174         cfs_waitq_signal (&svc->srv_waitq);
 175 }
 176
 177 void
 178 ptlrpc_commit_replies (struct obd_device *obd)
 179 {
 180         struct list_head   *tmp;
 181         struct list_head   *nxt;
 182
 183         /* Find any replies that have been committed and get their service
 184          * to attend to complete them. */
 185
 186         /* CAVEAT EMPTOR: spinlock ordering!!! */
 187         spin_lock(&obd->obd_uncommitted_replies_lock);
 188
 189         list_for_each_safe (tmp, nxt, &obd->obd_uncommitted_replies) {
 190                 struct ptlrpc_reply_state *rs =
 191                         list_entry(tmp, struct ptlrpc_reply_state, rs_obd_list);
 192
 193                 LASSERT (rs->rs_difficult);
 194
 195                 if (rs->rs_transno <= obd->obd_last_committed) {
 196                         struct ptlrpc_service *svc = rs->rs_service;
 197
 198                         spin_lock (&svc->srv_lock);
 199                         list_del_init (&rs->rs_obd_list);
 200                         ptlrpc_schedule_difficult_reply (rs);
 201                         spin_unlock (&svc->srv_lock);
 202                 }
 203         }
 204
 205         spin_unlock(&obd->obd_uncommitted_replies_lock);
 206 }
 207
 208 static int
 209 ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc)
 210 {
 211         struct ptlrpc_request_buffer_desc *rqbd;
 212         int                                rc;
 213         int                                posted = 0;
 214
 215         for (;;) {
 216                 spin_lock(&svc->srv_lock);
 217
 218                 if (list_empty (&svc->srv_idle_rqbds)) {
 219                         spin_unlock(&svc->srv_lock);
 220                         return (posted);
 221                 }
 222
 223                 rqbd = list_entry(svc->srv_idle_rqbds.next,
 224                                   struct ptlrpc_request_buffer_desc,
 225                                   rqbd_list);
 226                 list_del (&rqbd->rqbd_list);
 227
 228                 /* assume we will post successfully */
 229                 svc->srv_nrqbd_receiving++;
 230                 list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds);
 231
 232                 spin_unlock(&svc->srv_lock);
 233
 234                 rc = ptlrpc_register_rqbd(rqbd);
 235                 if (rc != 0)
 236                         break;
 237
 238                 posted = 1;
 239         }
 240
 241         spin_lock(&svc->srv_lock);
 242
 243         svc->srv_nrqbd_receiving--;
 244         list_del(&rqbd->rqbd_list);
 245         list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
 246
 247         /* Don't complain if no request buffers are posted right now; LNET
 248          * won't drop requests because we set the portal lazy! */
 249
 250         spin_unlock(&svc->srv_lock);
 251
 252         return (-1);
 253 }
 254
 255 struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c,
 256                                             svc_handler_t h, char *name,
 257                                             struct proc_dir_entry *proc_entry,
 258                                             svcreq_printfn_t prntfn)
 259 {
 260         return ptlrpc_init_svc(c->psc_nbufs, c->psc_bufsize,
 261                                c->psc_max_req_size, c->psc_max_reply_size,
 262                                c->psc_req_portal, c->psc_rep_portal,
 263                                c->psc_watchdog_timeout,
 264                                h, name, proc_entry,
 265                                prntfn, c->psc_num_threads, c->psc_ctx_tags);
 266 }
 267 EXPORT_SYMBOL(ptlrpc_init_svc_conf);
 268
 269 struct ptlrpc_service *
 270 ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, int max_reply_size,
 271                 int req_portal, int rep_portal, int watchdog_timeout,
 272                 svc_handler_t handler, char *name,
 273                 cfs_proc_dir_entry_t *proc_entry,
 274                 svcreq_printfn_t svcreq_printfn, int num_threads,
 275                 __u32 ctx_tags)
 276 {
 277         int                    rc;
 278         struct ptlrpc_service *service;
 279         ENTRY;
 280
 281         LASSERT (nbufs > 0);
 282         LASSERT (bufsize >= max_req_size);
 283         LASSERT (ctx_tags != 0);
 284
 285         OBD_ALLOC(service, sizeof(*service));
 286         if (service == NULL)
 287                 RETURN(NULL);
 288
 289         /* First initialise enough for early teardown */
 290
 291         service->srv_name = name;
 292         spin_lock_init(&service->srv_lock);
 293         CFS_INIT_LIST_HEAD(&service->srv_threads);
 294         cfs_waitq_init(&service->srv_waitq);
 295
 296         service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 : nbufs;
 297         service->srv_max_req_size = max_req_size;
 298         service->srv_buf_size = bufsize;
 299         service->srv_rep_portal = rep_portal;
 300         service->srv_req_portal = req_portal;
 301         service->srv_watchdog_timeout = watchdog_timeout;
 302         service->srv_handler = handler;
 303         service->srv_request_history_print_fn = svcreq_printfn;
 304         service->srv_request_seq = 1;           /* valid seq #s start at 1 */
 305         service->srv_request_max_cull_seq = 0;
 306         service->srv_num_threads = num_threads;
 307         service->srv_ctx_tags = ctx_tags;
 308
 309         rc = LNetSetLazyPortal(service->srv_req_portal);
 310         LASSERT (rc == 0);
 311
 312         CFS_INIT_LIST_HEAD(&service->srv_request_queue);
 313         CFS_INIT_LIST_HEAD(&service->srv_idle_rqbds);
 314         CFS_INIT_LIST_HEAD(&service->srv_active_rqbds);
 315         CFS_INIT_LIST_HEAD(&service->srv_history_rqbds);
 316         CFS_INIT_LIST_HEAD(&service->srv_request_history);
 317         CFS_INIT_LIST_HEAD(&service->srv_active_replies);
 318         CFS_INIT_LIST_HEAD(&service->srv_reply_queue);
 319         CFS_INIT_LIST_HEAD(&service->srv_free_rs_list);
 320         cfs_waitq_init(&service->srv_free_rs_waitq);
 321
 322         spin_lock (&ptlrpc_all_services_lock);
 323         list_add (&service->srv_list, &ptlrpc_all_services);
 324         spin_unlock (&ptlrpc_all_services_lock);
 325
 326         /* Now allocate the request buffers */
 327         rc = ptlrpc_grow_req_bufs(service);
 328         /* We shouldn't be under memory pressure at startup, so
 329          * fail if we can't post all our buffers at this time. */
 330         if (rc != 0)
 331                 GOTO(failed, NULL);
 332
 333         /* Now allocate pool of reply buffers */
 334         /* Increase max reply size to next power of two */
 335         service->srv_max_reply_size = 1;
 336         while (service->srv_max_reply_size < max_reply_size)
 337                 service->srv_max_reply_size <<= 1;
 338
 339         if (proc_entry != NULL)
 340                 ptlrpc_lprocfs_register_service(proc_entry, service);
 341
 342         CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
 343                service->srv_name, service->srv_req_portal);
 344
 345         RETURN(service);
 346 failed:
 347         ptlrpc_unregister_service(service);
 348         return NULL;
 349 }
 350
 351 static void __ptlrpc_server_free_request(struct ptlrpc_request *req)
 352 {
 353         struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
 354
 355         list_del(&req->rq_list);
 356
 357         if (req->rq_reply_state != NULL) {
 358                 ptlrpc_rs_decref(req->rq_reply_state);
 359                 req->rq_reply_state = NULL;
 360         }
 361
 362         if (req != &rqbd->rqbd_req) {
 363                 /* NB request buffers use an embedded
 364                  * req if the incoming req unlinked the
 365                  * MD; this isn't one of them! */
 366                 OBD_FREE(req, sizeof(*req));
 367         }
 368 }
 369
 370 static void
 371 ptlrpc_server_free_request(struct ptlrpc_request *req)
 372 {
 373         struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
 374         struct ptlrpc_service             *svc = rqbd->rqbd_service;
 375         int                                refcount;
 376         struct list_head                  *tmp;
 377         struct list_head                  *nxt;
 378
 379         spin_lock(&svc->srv_lock);
 380
 381         svc->srv_n_active_reqs--;
 382         list_add(&req->rq_list, &rqbd->rqbd_reqs);
 383
 384         refcount = --(rqbd->rqbd_refcount);
 385         if (refcount == 0) {
 386                 /* request buffer is now idle: add to history */
 387                 list_del(&rqbd->rqbd_list);
 388                 list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
 389                 svc->srv_n_history_rqbds++;
 390
 391                 /* cull some history?
 392                  * I expect only about 1 or 2 rqbds need to be recycled here */
 393                 while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
 394                         rqbd = list_entry(svc->srv_history_rqbds.next,
 395                                           struct ptlrpc_request_buffer_desc,
 396                                           rqbd_list);
 397
 398                         list_del(&rqbd->rqbd_list);
 399                         svc->srv_n_history_rqbds--;
 400
 401                         /* remove rqbd's reqs from svc's req history while
 402                          * I've got the service lock */
 403                         list_for_each(tmp, &rqbd->rqbd_reqs) {
 404                                 req = list_entry(tmp, struct ptlrpc_request,
 405                                                  rq_list);
 406                                 /* Track the highest culled req seq */
 407                                 if (req->rq_history_seq >
 408                                     svc->srv_request_max_cull_seq)
 409                                         svc->srv_request_max_cull_seq =
 410                                                 req->rq_history_seq;
 411                                 list_del(&req->rq_history_list);
 412                         }
 413
 414                         spin_unlock(&svc->srv_lock);
 415
 416                         list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
 417                                 req = list_entry(rqbd->rqbd_reqs.next,
 418                                                  struct ptlrpc_request,
 419                                                  rq_list);
 420                                 __ptlrpc_server_free_request(req);
 421                         }
 422
 423                         spin_lock(&svc->srv_lock);
 424
 425                         /* schedule request buffer for re-use.
 426                          * NB I can only do this after I've disposed of their
 427                          * reqs; particularly the embedded req */
 428                         list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
 429                 }
 430         } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
 431                  /* If we are low on memory, we are not interested in
 432                     history */
 433                 list_del(&req->rq_history_list);
 434                 __ptlrpc_server_free_request(req);
 435         }
 436
 437         spin_unlock(&svc->srv_lock);
 438
 439 }
 440
 441 /* This function makes sure dead exports are evicted in a timely manner.
 442    This function is only called when some export receives a message (i.e.,
 443    the network is up.) */
 444 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
 445 {
 446         struct obd_export *oldest_exp;
 447         time_t oldest_time;
 448
 449         ENTRY;
 450
 451         LASSERT(exp);
 452
 453         /* Compensate for slow machines, etc, by faking our request time
 454            into the future.  Although this can break the strict time-ordering
 455            of the list, we can be really lazy here - we don't have to evict
 456            at the exact right moment.  Eventually, all silent exports
 457            will make it to the top of the list. */
 458         exp->exp_last_request_time = max(exp->exp_last_request_time,
 459                                          (time_t)CURRENT_SECONDS + extra_delay);
 460
 461         CDEBUG(D_INFO, "updating export %s at %ld\n",
 462                exp->exp_client_uuid.uuid,
 463                exp->exp_last_request_time);
 464
 465         /* exports may get disconnected from the chain even though the
 466            export has references, so we must keep the spin lock while
 467            manipulating the lists */
 468         spin_lock(&exp->exp_obd->obd_dev_lock);
 469
 470         if (list_empty(&exp->exp_obd_chain_timed)) {
 471                 /* this one is not timed */
 472                 spin_unlock(&exp->exp_obd->obd_dev_lock);
 473                 EXIT;
 474                 return;
 475         }
 476
 477         list_move_tail(&exp->exp_obd_chain_timed,
 478                        &exp->exp_obd->obd_exports_timed);
 479
 480         oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
 481                                 struct obd_export, exp_obd_chain_timed);
 482         oldest_time = oldest_exp->exp_last_request_time;
 483         spin_unlock(&exp->exp_obd->obd_dev_lock);
 484
 485         if (exp->exp_obd->obd_recovering) {
 486                 /* be nice to everyone during recovery */
 487                 EXIT;
 488                 return;
 489         }
 490
 491         /* Note - racing to start/reset the obd_eviction timer is safe */
 492         if (exp->exp_obd->obd_eviction_timer == 0) {
 493                 /* Check if the oldest entry is expired. */
 494                 if (CURRENT_SECONDS > (oldest_time +
 495                                        (3 * obd_timeout / 2) + extra_delay)) {
 496                         /* We need a second timer, in case the net was down and
 497                          * it just came back. Since the pinger may skip every
 498                          * other PING_INTERVAL (see note in ptlrpc_pinger_main),
 499                          * we better wait for 3. */
 500                         exp->exp_obd->obd_eviction_timer = CURRENT_SECONDS +
 501                                 3 * PING_INTERVAL;
 502                         CDEBUG(D_HA, "%s: Think about evicting %s from %ld\n",
 503                                exp->exp_obd->obd_name, obd_export_nid2str(exp),
 504                                oldest_time);
 505                 }
 506         } else {
 507                 if (CURRENT_SECONDS > (exp->exp_obd->obd_eviction_timer +
 508                                        extra_delay)) {
 509                         /* The evictor won't evict anyone who we've heard from
 510                          * recently, so we don't have to check before we start
 511                          * it. */
 512                         if (!ping_evictor_wake(exp))
 513                                 exp->exp_obd->obd_eviction_timer = 0;
 514                 }
 515         }
 516
 517         EXIT;
 518 }
 519
 520 static int
 521 ptlrpc_server_handle_request(struct ptlrpc_service *svc,
 522                              struct ptlrpc_thread *thread)
 523 {
 524         struct ptlrpc_request *request;
 525         struct timeval         work_start;
 526         struct timeval         work_end;
 527         long                   timediff;
 528         int                    rc;
 529         ENTRY;
 530
 531         LASSERT(svc);
 532
 533         spin_lock(&svc->srv_lock);
 534         if (list_empty (&svc->srv_request_queue) ||
 535             (svc->srv_n_difficult_replies != 0 &&
 536              svc->srv_n_active_reqs >= (svc->srv_nthreads - 1))) {
 537                 /* If all the other threads are handling requests, I must
 538                  * remain free to handle any 'difficult' reply that might
 539                  * block them */
 540                 spin_unlock(&svc->srv_lock);
 541                 RETURN(0);
 542         }
 543
 544         request = list_entry (svc->srv_request_queue.next,
 545                               struct ptlrpc_request, rq_list);
 546         list_del_init (&request->rq_list);
 547         svc->srv_n_queued_reqs--;
 548         svc->srv_n_active_reqs++;
 549
 550         spin_unlock(&svc->srv_lock);
 551
 552         do_gettimeofday(&work_start);
 553         timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
 554         if (svc->srv_stats != NULL) {
 555                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
 556                                     timediff);
 557                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
 558                                     svc->srv_n_queued_reqs);
 559                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
 560                                     svc->srv_n_active_reqs);
 561         }
 562
 563 #if SWAB_PARANOIA
 564         /* Clear request swab mask; this is a new request */
 565         request->rq_req_swab_mask = 0;
 566 #endif
 567         rc = lustre_unpack_msg(request->rq_reqmsg, request->rq_reqlen);
 568         if (rc != 0) {
 569                 CERROR ("error unpacking request: ptl %d from %s"
 570                         " xid "LPU64"\n", svc->srv_req_portal,
 571                         libcfs_id2str(request->rq_peer), request->rq_xid);
 572                 goto out;
 573         }
 574
 575         rc = lustre_unpack_ptlrpc_body(request->rq_reqmsg);
 576         if (rc) {
 577                 CERROR ("error unpacking ptlrpc body: ptl %d from %s"
 578                         " xid "LPU64"\n", svc->srv_req_portal,
 579                         libcfs_id2str(request->rq_peer), request->rq_xid);
 580                 goto out;
 581         }
 582
 583         rc = -EINVAL;
 584         if (lustre_msg_get_type(request->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
 585                 CERROR("wrong packet type received (type=%u) from %s\n",
 586                        lustre_msg_get_type(request->rq_reqmsg),
 587                        libcfs_id2str(request->rq_peer));
 588                 goto out;
 589         }
 590
 591         CDEBUG(D_NET, "got req "LPD64"\n", request->rq_xid);
 592
 593         request->rq_svc_thread = thread;
 594         request->rq_export = class_conn2export(
 595                                      lustre_msg_get_handle(request->rq_reqmsg));
 596
 597         if (request->rq_export) {
 598                 if (lustre_msg_get_conn_cnt(request->rq_reqmsg) <
 599                     request->rq_export->exp_conn_cnt) {
 600                         DEBUG_REQ(D_ERROR, request,
 601                                   "DROPPING req from old connection %d < %d",
 602                                   lustre_msg_get_conn_cnt(request->rq_reqmsg),
 603                                   request->rq_export->exp_conn_cnt);
 604                         goto put_conn;
 605                 }
 606                 if (request->rq_export->exp_obd &&
 607                     request->rq_export->exp_obd->obd_fail) {
 608                         /* Failing over, don't handle any more reqs, send
 609                            error response instead. */
 610                         CDEBUG(D_HA, "Dropping req %p for failed obd %s\n",
 611                                request, request->rq_export->exp_obd->obd_name);
 612                         request->rq_status = -ENODEV;
 613                         ptlrpc_error(request);
 614                         goto put_conn;
 615                 }
 616
 617                 ptlrpc_update_export_timer(request->rq_export, timediff/500000);
 618         }
 619
 620         /* Discard requests queued for longer than my timeout.  If the
 621          * client's timeout is similar to mine, she'll be timing out this
 622          * REQ anyway (bug 1502) */
 623         if (timediff / 1000000 > (long)obd_timeout) {
 624                 CERROR("Dropping timed-out opc %d request from %s"
 625                        ": %ld seconds old\n",
 626                        lustre_msg_get_opc(request->rq_reqmsg),
 627                        libcfs_id2str(request->rq_peer),
 628                        timediff / 1000000);
 629                 goto put_conn;
 630         }
 631
 632         request->rq_phase = RQ_PHASE_INTERPRET;
 633
 634         CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
 635                "%s:%s+%d:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 636                (request->rq_export ?
 637                 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
 638                (request->rq_export ?
 639                 atomic_read(&request->rq_export->exp_refcount) : -99),
 640                lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
 641                libcfs_id2str(request->rq_peer),
 642                lustre_msg_get_opc(request->rq_reqmsg));
 643
 644         rc = svc->srv_handler(request);
 645
 646         request->rq_phase = RQ_PHASE_COMPLETE;
 647
 648         CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
 649                "%s:%s+%d:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 650                (request->rq_export ?
 651                 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
 652                (request->rq_export ?
 653                 atomic_read(&request->rq_export->exp_refcount) : -99),
 654                lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
 655                libcfs_id2str(request->rq_peer),
 656                lustre_msg_get_opc(request->rq_reqmsg));
 657
 658 put_conn:
 659         if (request->rq_export != NULL)
 660                 class_export_put(request->rq_export);
 661
 662  out:
 663         do_gettimeofday(&work_end);
 664
 665         timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
 666
 667         if (timediff / 1000000 > (long)obd_timeout)
 668                 CERROR("request "LPU64" opc %u from %s processed in %lds "
 669                        "trans "LPU64" rc %d/%d\n",
 670                        request->rq_xid, lustre_msg_get_opc(request->rq_reqmsg),
 671                        libcfs_id2str(request->rq_peer),
 672                        cfs_timeval_sub(&work_end, &request->rq_arrival_time,
 673                                        NULL) / 1000000,
 674                        request->rq_repmsg ?
 675                                 lustre_msg_get_transno(request->rq_repmsg) :
 676                                 request->rq_transno, request->rq_status,
 677                        request->rq_repmsg ?
 678                                 lustre_msg_get_status(request->rq_repmsg) :
 679                                  -999);
 680         else
 681                 CDEBUG(D_HA, "request "LPU64" opc %u from %s processed in "
 682                        "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
 683                        request->rq_xid, lustre_msg_get_opc(request->rq_reqmsg),
 684                        libcfs_id2str(request->rq_peer), timediff,
 685                        cfs_timeval_sub(&work_end, &request->rq_arrival_time,
 686                                        NULL),
 687                        request->rq_transno, request->rq_status,
 688                        request->rq_repmsg ?
 689                                 lustre_msg_get_status(request->rq_repmsg) :
 690                                 -999);
 691
 692         if (svc->srv_stats != NULL) {
 693                 int opc = opcode_offset(lustre_msg_get_opc(request->rq_reqmsg));
 694                 if (opc > 0) {
 695                         LASSERT(opc < LUSTRE_MAX_OPCODES);
 696                         lprocfs_counter_add(svc->srv_stats,
 697                                             opc + PTLRPC_LAST_CNTR,
 698                                             timediff);
 699                 }
 700         }
 701
 702         ptlrpc_server_free_request(request);
 703
 704         RETURN(1);
 705 }
 706
 707 static int
 708 ptlrpc_server_handle_reply (struct ptlrpc_service *svc)
 709 {
 710         struct ptlrpc_reply_state *rs;
 711         struct obd_export         *exp;
 712         struct obd_device         *obd;
 713         int                        nlocks;
 714         int                        been_handled;
 715         ENTRY;
 716
 717         spin_lock(&svc->srv_lock);
 718         if (list_empty (&svc->srv_reply_queue)) {
 719                 spin_unlock(&svc->srv_lock);
 720                 RETURN(0);
 721         }
 722
 723         rs = list_entry (svc->srv_reply_queue.next,
 724                          struct ptlrpc_reply_state, rs_list);
 725
 726         exp = rs->rs_export;
 727         obd = exp->exp_obd;
 728
 729         LASSERT (rs->rs_difficult);
 730         LASSERT (rs->rs_scheduled);
 731
 732         list_del_init (&rs->rs_list);
 733
 734         /* Disengage from notifiers carefully (lock order - irqrestore below!)*/
 735         spin_unlock(&svc->srv_lock);
 736
 737         spin_lock (&obd->obd_uncommitted_replies_lock);
 738         /* Noop if removed already */
 739         list_del_init (&rs->rs_obd_list);
 740         spin_unlock (&obd->obd_uncommitted_replies_lock);
 741
 742         spin_lock (&exp->exp_lock);
 743         /* Noop if removed already */
 744         list_del_init (&rs->rs_exp_list);
 745         spin_unlock (&exp->exp_lock);
 746
 747         spin_lock(&svc->srv_lock);
 748
 749         been_handled = rs->rs_handled;
 750         rs->rs_handled = 1;
 751
 752         nlocks = rs->rs_nlocks;                 /* atomic "steal", but */
 753         rs->rs_nlocks = 0;                      /* locks still on rs_locks! */
 754
 755         if (nlocks == 0 && !been_handled) {
 756                 /* If we see this, we should already have seen the warning
 757                  * in mds_steal_ack_locks()  */
 758                 CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
 759                       " o%d NID %s\n",
 760                       rs,
 761                       rs->rs_xid, rs->rs_transno,
 762                       lustre_msg_get_opc(rs->rs_msg),
 763                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
 764         }
 765
 766         if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
 767                 spin_unlock(&svc->srv_lock);
 768
 769                 if (!been_handled && rs->rs_on_net) {
 770                         LNetMDUnlink(rs->rs_md_h);
 771                         /* Ignore return code; we're racing with
 772                          * completion... */
 773                 }
 774
 775                 while (nlocks-- > 0)
 776                         ldlm_lock_decref(&rs->rs_locks[nlocks],
 777                                          rs->rs_modes[nlocks]);
 778
 779                 spin_lock(&svc->srv_lock);
 780         }
 781
 782         rs->rs_scheduled = 0;
 783
 784         if (!rs->rs_on_net) {
 785                 /* Off the net */
 786                 svc->srv_n_difficult_replies--;
 787                 spin_unlock(&svc->srv_lock);
 788
 789                 class_export_put (exp);
 790                 rs->rs_export = NULL;
 791                 ptlrpc_rs_decref (rs);
 792                 atomic_dec (&svc->srv_outstanding_replies);
 793                 RETURN(1);
 794         }
 795
 796         /* still on the net; callback will schedule */
 797         spin_unlock(&svc->srv_lock);
 798         RETURN(1);
 799 }
 800
 801 #ifndef __KERNEL__
 802 /* FIXME make use of timeout later */
 803 int
 804 liblustre_check_services (void *arg)
 805 {
 806         int  did_something = 0;
 807         int  rc;
 808         struct list_head *tmp, *nxt;
 809         ENTRY;
 810
 811         /* I'm relying on being single threaded, not to have to lock
 812          * ptlrpc_all_services etc */
 813         list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
 814                 struct ptlrpc_service *svc =
 815                         list_entry (tmp, struct ptlrpc_service, srv_list);
 816
 817                 if (svc->srv_nthreads != 0)     /* I've recursed */
 818                         continue;
 819
 820                 /* service threads can block for bulk, so this limits us
 821                  * (arbitrarily) to recursing 1 stack frame per service.
 822                  * Note that the problem with recursion is that we have to
 823                  * unwind completely before our caller can resume. */
 824
 825                 svc->srv_nthreads++;
 826
 827                 do {
 828                         rc = ptlrpc_server_handle_reply(svc);
 829                         rc |= ptlrpc_server_handle_request(svc, NULL);
 830                         rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
 831                         did_something |= rc;
 832                 } while (rc);
 833
 834                 svc->srv_nthreads--;
 835         }
 836
 837         RETURN(did_something);
 838 }
 839 #define ptlrpc_stop_all_threads(s) do {} while (0)
 840
 841 #else /* __KERNEL__ */
 842
 843 /* Don't use daemonize, it removes fs struct from new thread (bug 418) */
 844 void ptlrpc_daemonize(char *name)
 845 {
 846         struct fs_struct *fs = current->fs;
 847
 848         atomic_inc(&fs->count);
 849         cfs_daemonize(name);
 850         exit_fs(cfs_current());
 851         current->fs = fs;
 852         ll_set_fs_pwd(current->fs, init_task.fs->pwdmnt, init_task.fs->pwd);
 853 }
 854
 855 static void
 856 ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
 857 {
 858         int avail = svc->srv_nrqbd_receiving;
 859         int low_water = test_req_buffer_pressure ? 0 :
 860                         svc->srv_nbuf_per_group/2;
 861
 862         /* NB I'm not locking; just looking. */
 863
 864         /* CAVEAT EMPTOR: We might be allocating buffers here because we've
 865          * allowed the request history to grow out of control.  We could put a
 866          * sanity check on that here and cull some history if we need the
 867          * space. */
 868
 869         if (avail <= low_water)
 870                 ptlrpc_grow_req_bufs(svc);
 871
 872         if (svc->srv_stats)
 873                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
 874                                     avail);
 875 }
 876
 877 static int
 878 ptlrpc_retry_rqbds(void *arg)
 879 {
 880         struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
 881
 882         svc->srv_rqbd_timeout = 0;
 883         return (-ETIMEDOUT);
 884 }
 885
 886 static int ptlrpc_main(void *arg)
 887 {
 888         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 889         struct ptlrpc_service  *svc = data->svc;
 890         struct ptlrpc_thread   *thread = data->thread;
 891         struct ptlrpc_reply_state *rs;
 892         struct lc_watchdog     *watchdog;
 893 #ifdef WITH_GROUP_INFO
 894         struct group_info *ginfo = NULL;
 895 #endif
 896         struct lu_context ctx;
 897         int rc = 0;
 898         ENTRY;
 899
 900         ptlrpc_daemonize(data->name);
 901
 902 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,9) && CONFIG_NUMA
 903         /* we need to do this before any per-thread allocation is done so that
 904          * we get the per-thread allocations on local node.  bug 7342 */
 905         if (svc->srv_cpu_affinity) {
 906                 int cpu, num_cpu;
 907
 908                 for (cpu = 0, num_cpu = 0; cpu < NR_CPUS; cpu++) {
 909                         if (!cpu_online(cpu))
 910                                 continue;
 911                         if (num_cpu == thread->t_id % num_online_cpus())
 912                                 break;
 913                         num_cpu++;
 914                 }
 915                 set_cpus_allowed(cfs_current(), node_to_cpumask(cpu_to_node(cpu)));
 916         }
 917 #endif
 918
 919 #ifdef WITH_GROUP_INFO
 920         ginfo = groups_alloc(0);
 921         if (!ginfo) {
 922                 rc = -ENOMEM;
 923                 goto out;
 924         }
 925
 926         set_current_groups(ginfo);
 927         put_group_info(ginfo);
 928 #endif
 929
 930         if (svc->srv_init != NULL) {
 931                 rc = svc->srv_init(thread);
 932                 if (rc)
 933                         goto out;
 934         }
 935
 936         rc = lu_context_init(&ctx, svc->srv_ctx_tags);
 937         if (rc)
 938                 goto out_srv_init;
 939
 940         thread->t_ctx = &ctx;
 941         ctx.lc_thread = thread;
 942
 943         /* Alloc reply state structure for this one */
 944         OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
 945         if (!rs) {
 946                 rc = -ENOMEM;
 947                 goto out_srv_init;
 948         }
 949
 950         /* Record that the thread is running */
 951         thread->t_flags = SVC_RUNNING;
 952         /*
 953          * wake up our creator. Note: @data is invalid after this point,
 954          * because it's allocated on ptlrpc_start_thread() stack.
 955          */
 956         cfs_waitq_signal(&thread->t_ctl_waitq);
 957
 958         watchdog = lc_watchdog_add(svc->srv_watchdog_timeout, NULL, NULL);
 959
 960         spin_lock(&svc->srv_lock);
 961         svc->srv_nthreads++;
 962         list_add(&rs->rs_list, &svc->srv_free_rs_list);
 963         spin_unlock(&svc->srv_lock);
 964         cfs_waitq_signal(&svc->srv_free_rs_waitq);
 965
 966         CDEBUG(D_NET, "service thread %d started\n", thread->t_id);
 967
 968         /* XXX maintain a list of all managed devices: insert here */
 969
 970         while ((thread->t_flags & SVC_STOPPING) == 0 ||
 971                svc->srv_n_difficult_replies != 0) {
 972                 /* Don't exit while there are replies to be handled */
 973                 struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
 974                                                      ptlrpc_retry_rqbds, svc);
 975
 976                 lc_watchdog_disable(watchdog);
 977
 978                 l_wait_event_exclusive (svc->srv_waitq,
 979                               ((thread->t_flags & SVC_STOPPING) != 0 &&
 980                                svc->srv_n_difficult_replies == 0) ||
 981                               (!list_empty(&svc->srv_idle_rqbds) &&
 982                                svc->srv_rqbd_timeout == 0) ||
 983                               !list_empty (&svc->srv_reply_queue) ||
 984                               (!list_empty (&svc->srv_request_queue) &&
 985                                (svc->srv_n_difficult_replies == 0 ||
 986                                 svc->srv_n_active_reqs <
 987                                 (svc->srv_nthreads - 1))),
 988                               &lwi);
 989
 990                 lc_watchdog_touch(watchdog);
 991
 992                 ptlrpc_check_rqbd_pool(svc);
 993
 994                 if (!list_empty (&svc->srv_reply_queue))
 995                         ptlrpc_server_handle_reply (svc);
 996
 997                 /* only handle requests if there are no difficult replies
 998                  * outstanding, or I'm not the last thread handling
 999                  * requests */
1000                 if (!list_empty (&svc->srv_request_queue) &&
1001                     (svc->srv_n_difficult_replies == 0 ||
1002                      svc->srv_n_active_reqs < (svc->srv_nthreads - 1))) {
1003                         lu_context_enter(&ctx);
1004                         ptlrpc_server_handle_request(svc, thread);
1005                         lu_context_exit(&ctx);
1006                 }
1007
1008                 if (!list_empty(&svc->srv_idle_rqbds) &&
1009                     ptlrpc_server_post_idle_rqbds(svc) < 0) {
1010                         /* I just failed to repost request buffers.  Wait
1011                          * for a timeout (unless something else happens)
1012                          * before I try again */
1013                         svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
1014                         CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
1015                                svc->srv_nrqbd_receiving);
1016                 }
1017         }
1018
1019         lc_watchdog_delete(watchdog);
1020
1021 out_srv_init:
1022         /*
1023          * deconstruct service specific state created by ptlrpc_start_thread()
1024          */
1025         if (svc->srv_done != NULL)
1026                 svc->srv_done(thread);
1027
1028 out:
1029         lu_context_fini(&ctx);
1030
1031         CDEBUG(D_NET, "service thread %d exiting: rc %d\n", thread->t_id, rc);
1032
1033         spin_lock(&svc->srv_lock);
1034         svc->srv_nthreads--;                    /* must know immediately */
1035         thread->t_id = rc;
1036         thread->t_flags = SVC_STOPPED;
1037
1038         cfs_waitq_signal(&thread->t_ctl_waitq);
1039         spin_unlock(&svc->srv_lock);
1040
1041         return rc;
1042 }
1043
1044 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
1045                                struct ptlrpc_thread *thread)
1046 {
1047         struct l_wait_info lwi = { 0 };
1048
1049         spin_lock(&svc->srv_lock);
1050         thread->t_flags = SVC_STOPPING;
1051         spin_unlock(&svc->srv_lock);
1052
1053         cfs_waitq_broadcast(&svc->srv_waitq);
1054         l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED),
1055                      &lwi);
1056
1057         spin_lock(&svc->srv_lock);
1058         list_del(&thread->t_link);
1059         spin_unlock(&svc->srv_lock);
1060
1061         OBD_FREE(thread, sizeof(*thread));
1062 }
1063
1064 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
1065 {
1066         struct ptlrpc_thread *thread;
1067
1068         spin_lock(&svc->srv_lock);
1069         while (!list_empty(&svc->srv_threads)) {
1070                 thread = list_entry(svc->srv_threads.next,
1071                                     struct ptlrpc_thread, t_link);
1072
1073                 spin_unlock(&svc->srv_lock);
1074                 ptlrpc_stop_thread(svc, thread);
1075                 spin_lock(&svc->srv_lock);
1076         }
1077
1078         spin_unlock(&svc->srv_lock);
1079 }
1080
1081 /* @base_name should be 11 characters or less - 3 will be added on */
1082 int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc,
1083                          char *base_name)
1084 {
1085         int i, rc = 0;
1086         ENTRY;
1087
1088         LASSERT(svc->srv_num_threads > 0);
1089         for (i = 0; i < svc->srv_num_threads; i++) {
1090                 char name[32];
1091                 sprintf(name, "%s_%02d", base_name, i);
1092                 rc = ptlrpc_start_thread(dev, svc, name, i);
1093                 if (rc) {
1094                         CERROR("cannot start %s thread #%d: rc %d\n", base_name,
1095                                i, rc);
1096                         ptlrpc_stop_all_threads(svc);
1097                 }
1098         }
1099         RETURN(rc);
1100 }
1101
1102 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
1103                         char *name, int id)
1104 {
1105         struct l_wait_info lwi = { 0 };
1106         struct ptlrpc_svc_data d;
1107         struct ptlrpc_thread *thread;
1108         int rc;
1109         ENTRY;
1110
1111         OBD_ALLOC(thread, sizeof(*thread));
1112         if (thread == NULL)
1113                 RETURN(-ENOMEM);
1114         cfs_waitq_init(&thread->t_ctl_waitq);
1115         thread->t_id = id;
1116
1117         spin_lock(&svc->srv_lock);
1118         list_add(&thread->t_link, &svc->srv_threads);
1119         spin_unlock(&svc->srv_lock);
1120
1121         d.dev = dev;
1122         d.svc = svc;
1123         d.name = name;
1124         d.thread = thread;
1125
1126         /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
1127          * just drop the VM and FILES in ptlrpc_daemonize() right away.
1128          */
1129         rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
1130         if (rc < 0) {
1131                 CERROR("cannot start thread '%s': rc %d\n", name, rc);
1132
1133                 spin_lock(&svc->srv_lock);
1134                 list_del(&thread->t_link);
1135                 spin_unlock(&svc->srv_lock);
1136
1137                 OBD_FREE(thread, sizeof(*thread));
1138                 RETURN(rc);
1139         }
1140         l_wait_event(thread->t_ctl_waitq,
1141                      thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
1142
1143         rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
1144         RETURN(rc);
1145 }
1146 #endif
1147
1148 int ptlrpc_unregister_service(struct ptlrpc_service *service)
1149 {
1150         int                   rc;
1151         struct l_wait_info    lwi;
1152         struct list_head     *tmp;
1153         struct ptlrpc_reply_state *rs, *t;
1154
1155         ptlrpc_stop_all_threads(service);
1156         LASSERT(list_empty(&service->srv_threads));
1157
1158         spin_lock (&ptlrpc_all_services_lock);
1159         list_del_init (&service->srv_list);
1160         spin_unlock (&ptlrpc_all_services_lock);
1161
1162         ptlrpc_lprocfs_unregister_service(service);
1163
1164         /* All history will be culled when the next request buffer is
1165          * freed */
1166         service->srv_max_history_rqbds = 0;
1167
1168         CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
1169
1170         rc = LNetClearLazyPortal(service->srv_req_portal);
1171         LASSERT (rc == 0);
1172
1173         /* Unlink all the request buffers.  This forces a 'final' event with
1174          * its 'unlink' flag set for each posted rqbd */
1175         list_for_each(tmp, &service->srv_active_rqbds) {
1176                 struct ptlrpc_request_buffer_desc *rqbd =
1177                         list_entry(tmp, struct ptlrpc_request_buffer_desc,
1178                                    rqbd_list);
1179
1180                 rc = LNetMDUnlink(rqbd->rqbd_md_h);
1181                 LASSERT (rc == 0 || rc == -ENOENT);
1182         }
1183
1184         /* Wait for the network to release any buffers it's currently
1185          * filling */
1186         for (;;) {
1187                 spin_lock(&service->srv_lock);
1188                 rc = service->srv_nrqbd_receiving;
1189                 spin_unlock(&service->srv_lock);
1190
1191                 if (rc == 0)
1192                         break;
1193
1194                 /* Network access will complete in finite time but the HUGE
1195                  * timeout lets us CWARN for visibility of sluggish NALs */
1196                 lwi = LWI_TIMEOUT(cfs_time_seconds(300), NULL, NULL);
1197                 rc = l_wait_event(service->srv_waitq,
1198                                   service->srv_nrqbd_receiving == 0,
1199                                   &lwi);
1200                 if (rc == -ETIMEDOUT)
1201                         CWARN("Service %s waiting for request buffers\n",
1202                               service->srv_name);
1203         }
1204
1205         /* schedule all outstanding replies to terminate them */
1206         spin_lock(&service->srv_lock);
1207         while (!list_empty(&service->srv_active_replies)) {
1208                 struct ptlrpc_reply_state *rs =
1209                         list_entry(service->srv_active_replies.next,
1210                                    struct ptlrpc_reply_state, rs_list);
1211                 ptlrpc_schedule_difficult_reply(rs);
1212         }
1213         spin_unlock(&service->srv_lock);
1214
1215         /* purge the request queue.  NB No new replies (rqbds all unlinked)
1216          * and no service threads, so I'm the only thread noodling the
1217          * request queue now */
1218         while (!list_empty(&service->srv_request_queue)) {
1219                 struct ptlrpc_request *req =
1220                         list_entry(service->srv_request_queue.next,
1221                                    struct ptlrpc_request,
1222                                    rq_list);
1223
1224                 list_del(&req->rq_list);
1225                 service->srv_n_queued_reqs--;
1226                 service->srv_n_active_reqs++;
1227
1228                 ptlrpc_server_free_request(req);
1229         }
1230         LASSERT(service->srv_n_queued_reqs == 0);
1231         LASSERT(service->srv_n_active_reqs == 0);
1232         LASSERT(service->srv_n_history_rqbds == 0);
1233         LASSERT(list_empty(&service->srv_active_rqbds));
1234
1235         /* Now free all the request buffers since nothing references them
1236          * any more... */
1237         while (!list_empty(&service->srv_idle_rqbds)) {
1238                 struct ptlrpc_request_buffer_desc *rqbd =
1239                         list_entry(service->srv_idle_rqbds.next,
1240                                    struct ptlrpc_request_buffer_desc,
1241                                    rqbd_list);
1242
1243                 ptlrpc_free_rqbd(rqbd);
1244         }
1245
1246         /* wait for all outstanding replies to complete (they were
1247          * scheduled having been flagged to abort above) */
1248         while (atomic_read(&service->srv_outstanding_replies) != 0) {
1249                 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10), NULL, NULL);
1250
1251                 rc = l_wait_event(service->srv_waitq,
1252                                   !list_empty(&service->srv_reply_queue), &lwi);
1253                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
1254
1255                 if (rc == 0) {
1256                         ptlrpc_server_handle_reply(service);
1257                         continue;
1258                 }
1259                 CWARN("Unexpectedly long timeout %p\n", service);
1260         }
1261
1262         list_for_each_entry_safe(rs, t, &service->srv_free_rs_list, rs_list) {
1263                 list_del(&rs->rs_list);
1264                 OBD_FREE(rs, service->srv_max_reply_size);
1265         }
1266
1267         OBD_FREE(service, sizeof(*service));
1268         return 0;
1269 }
1270
1271 /* Returns 0 if the service is healthy.
1272  *
1273  * Right now, it just checks to make sure that requests aren't languishing
1274  * in the queue.  We'll use this health check to govern whether a node needs
1275  * to be shot, so it's intentionally non-aggressive. */
1276 int ptlrpc_service_health_check(struct ptlrpc_service *svc)
1277 {
1278         struct ptlrpc_request *request;
1279         struct timeval         right_now;
1280         long                   timediff, cutoff;
1281         int                    rc = 0;
1282
1283         if (svc == NULL)
1284                 return 0;
1285
1286         spin_lock(&svc->srv_lock);
1287
1288         if (list_empty(&svc->srv_request_queue))
1289                 goto out;
1290
1291         request = list_entry(svc->srv_request_queue.next,
1292                              struct ptlrpc_request, rq_list);
1293
1294         do_gettimeofday(&right_now);
1295         timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
1296
1297         cutoff = obd_health_check_timeout;
1298
1299         if (timediff / 1000000 > cutoff) {
1300                 rc = -1;
1301                 goto out;
1302         }
1303
1304  out:
1305         spin_unlock(&svc->srv_lock);
1306         return rc;
1307 }