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 + SPTLRPC_MAX_PAYLOAD);
 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 + SPTLRPC_MAX_PAYLOAD;
 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 <
 337                max_reply_size + SPTLRPC_MAX_PAYLOAD)
 338                 service->srv_max_reply_size <<= 1;
 339
 340         if (proc_entry != NULL)
 341                 ptlrpc_lprocfs_register_service(proc_entry, service);
 342
 343         CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
 344                service->srv_name, service->srv_req_portal);
 345
 346         RETURN(service);
 347 failed:
 348         ptlrpc_unregister_service(service);
 349         return NULL;
 350 }
 351
 352 static void __ptlrpc_server_free_request(struct ptlrpc_request *req)
 353 {
 354         struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
 355
 356         list_del(&req->rq_list);
 357
 358         if (req->rq_reply_state != NULL) {
 359                 ptlrpc_rs_decref(req->rq_reply_state);
 360                 req->rq_reply_state = NULL;
 361         }
 362
 363         sptlrpc_svc_ctx_decref(req);
 364
 365         if (req != &rqbd->rqbd_req) {
 366                 /* NB request buffers use an embedded
 367                  * req if the incoming req unlinked the
 368                  * MD; this isn't one of them! */
 369                 OBD_FREE(req, sizeof(*req));
 370         }
 371 }
 372
 373 static void
 374 ptlrpc_server_free_request(struct ptlrpc_request *req)
 375 {
 376         struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
 377         struct ptlrpc_service             *svc = rqbd->rqbd_service;
 378         int                                refcount;
 379         struct list_head                  *tmp;
 380         struct list_head                  *nxt;
 381
 382         spin_lock(&svc->srv_lock);
 383
 384         svc->srv_n_active_reqs--;
 385         list_add(&req->rq_list, &rqbd->rqbd_reqs);
 386
 387         refcount = --(rqbd->rqbd_refcount);
 388         if (refcount == 0) {
 389                 /* request buffer is now idle: add to history */
 390                 list_del(&rqbd->rqbd_list);
 391                 list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
 392                 svc->srv_n_history_rqbds++;
 393
 394                 /* cull some history?
 395                  * I expect only about 1 or 2 rqbds need to be recycled here */
 396                 while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
 397                         rqbd = list_entry(svc->srv_history_rqbds.next,
 398                                           struct ptlrpc_request_buffer_desc,
 399                                           rqbd_list);
 400
 401                         list_del(&rqbd->rqbd_list);
 402                         svc->srv_n_history_rqbds--;
 403
 404                         /* remove rqbd's reqs from svc's req history while
 405                          * I've got the service lock */
 406                         list_for_each(tmp, &rqbd->rqbd_reqs) {
 407                                 req = list_entry(tmp, struct ptlrpc_request,
 408                                                  rq_list);
 409                                 /* Track the highest culled req seq */
 410                                 if (req->rq_history_seq >
 411                                     svc->srv_request_max_cull_seq)
 412                                         svc->srv_request_max_cull_seq =
 413                                                 req->rq_history_seq;
 414                                 list_del(&req->rq_history_list);
 415                         }
 416
 417                         spin_unlock(&svc->srv_lock);
 418
 419                         list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
 420                                 req = list_entry(rqbd->rqbd_reqs.next,
 421                                                  struct ptlrpc_request,
 422                                                  rq_list);
 423                                 __ptlrpc_server_free_request(req);
 424                         }
 425
 426                         spin_lock(&svc->srv_lock);
 427
 428                         /* schedule request buffer for re-use.
 429                          * NB I can only do this after I've disposed of their
 430                          * reqs; particularly the embedded req */
 431                         list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
 432                 }
 433         } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
 434                  /* If we are low on memory, we are not interested in
 435                     history */
 436                 list_del(&req->rq_history_list);
 437                 __ptlrpc_server_free_request(req);
 438         }
 439
 440         spin_unlock(&svc->srv_lock);
 441
 442 }
 443
 444 /* This function makes sure dead exports are evicted in a timely manner.
 445    This function is only called when some export receives a message (i.e.,
 446    the network is up.) */
 447 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
 448 {
 449         struct obd_export *oldest_exp;
 450         time_t oldest_time;
 451
 452         ENTRY;
 453
 454         LASSERT(exp);
 455
 456         /* Compensate for slow machines, etc, by faking our request time
 457            into the future.  Although this can break the strict time-ordering
 458            of the list, we can be really lazy here - we don't have to evict
 459            at the exact right moment.  Eventually, all silent exports
 460            will make it to the top of the list. */
 461         exp->exp_last_request_time = max(exp->exp_last_request_time,
 462                                          (time_t)CURRENT_SECONDS + extra_delay);
 463
 464         CDEBUG(D_INFO, "updating export %s at %ld\n",
 465                exp->exp_client_uuid.uuid,
 466                exp->exp_last_request_time);
 467
 468         /* exports may get disconnected from the chain even though the
 469            export has references, so we must keep the spin lock while
 470            manipulating the lists */
 471         spin_lock(&exp->exp_obd->obd_dev_lock);
 472
 473         if (list_empty(&exp->exp_obd_chain_timed)) {
 474                 /* this one is not timed */
 475                 spin_unlock(&exp->exp_obd->obd_dev_lock);
 476                 EXIT;
 477                 return;
 478         }
 479
 480         list_move_tail(&exp->exp_obd_chain_timed,
 481                        &exp->exp_obd->obd_exports_timed);
 482
 483         oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
 484                                 struct obd_export, exp_obd_chain_timed);
 485         oldest_time = oldest_exp->exp_last_request_time;
 486         spin_unlock(&exp->exp_obd->obd_dev_lock);
 487
 488         if (exp->exp_obd->obd_recovering) {
 489                 /* be nice to everyone during recovery */
 490                 EXIT;
 491                 return;
 492         }
 493
 494         /* Note - racing to start/reset the obd_eviction timer is safe */
 495         if (exp->exp_obd->obd_eviction_timer == 0) {
 496                 /* Check if the oldest entry is expired. */
 497                 if (CURRENT_SECONDS > (oldest_time +
 498                                        (3 * obd_timeout / 2) + extra_delay)) {
 499                         /* We need a second timer, in case the net was down and
 500                          * it just came back. Since the pinger may skip every
 501                          * other PING_INTERVAL (see note in ptlrpc_pinger_main),
 502                          * we better wait for 3. */
 503                         exp->exp_obd->obd_eviction_timer = CURRENT_SECONDS +
 504                                 3 * PING_INTERVAL;
 505                         CDEBUG(D_HA, "%s: Think about evicting %s from %ld\n",
 506                                exp->exp_obd->obd_name, obd_export_nid2str(exp),
 507                                oldest_time);
 508                 }
 509         } else {
 510                 if (CURRENT_SECONDS > (exp->exp_obd->obd_eviction_timer +
 511                                        extra_delay)) {
 512                         /* The evictor won't evict anyone who we've heard from
 513                          * recently, so we don't have to check before we start
 514                          * it. */
 515                         if (!ping_evictor_wake(exp))
 516                                 exp->exp_obd->obd_eviction_timer = 0;
 517                 }
 518         }
 519
 520         EXIT;
 521 }
 522
 523 #ifndef __KERNEL__
 524 int lu_context_init(struct lu_context *ctx, __u32 tags)
 525 {
 526         return 0;
 527 }
 528
 529 void lu_context_fini(struct lu_context *ctx)
 530 {
 531 }
 532
 533 void lu_context_enter(struct lu_context *ctx)
 534 {
 535 }
 536
 537 void lu_context_exit(struct lu_context *ctx)
 538 {
 539 }
 540
 541 #endif
 542
 543 static int
 544 ptlrpc_server_handle_request(struct ptlrpc_service *svc,
 545                              struct ptlrpc_thread *thread)
 546 {
 547         struct ptlrpc_request *request;
 548         struct timeval         work_start;
 549         struct timeval         work_end;
 550         long                   timediff;
 551         int                    rc;
 552         ENTRY;
 553
 554         LASSERT(svc);
 555
 556         spin_lock(&svc->srv_lock);
 557         if (list_empty (&svc->srv_request_queue) ||
 558             (svc->srv_n_difficult_replies != 0 &&
 559              svc->srv_n_active_reqs >= (svc->srv_nthreads - 1))) {
 560                 /* If all the other threads are handling requests, I must
 561                  * remain free to handle any 'difficult' reply that might
 562                  * block them */
 563                 spin_unlock(&svc->srv_lock);
 564                 RETURN(0);
 565         }
 566
 567         request = list_entry (svc->srv_request_queue.next,
 568                               struct ptlrpc_request, rq_list);
 569         list_del_init (&request->rq_list);
 570         svc->srv_n_queued_reqs--;
 571         svc->srv_n_active_reqs++;
 572
 573         spin_unlock(&svc->srv_lock);
 574
 575         do_gettimeofday(&work_start);
 576         timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
 577         if (svc->srv_stats != NULL) {
 578                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
 579                                     timediff);
 580                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
 581                                     svc->srv_n_queued_reqs);
 582                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
 583                                     svc->srv_n_active_reqs);
 584         }
 585
 586         rc = sptlrpc_svc_unwrap_request(request);
 587         switch (rc) {
 588         case SECSVC_OK:
 589                 break;
 590         case SECSVC_COMPLETE:
 591                 target_send_reply(request, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
 592                 goto put_conn;
 593         case SECSVC_DROP:
 594                 goto out;
 595         default:
 596                 LBUG();
 597         }
 598
 599 #if SWAB_PARANOIA
 600         /* Clear request swab mask; this is a new request */
 601         request->rq_req_swab_mask = 0;
 602 #endif
 603         rc = lustre_unpack_msg(request->rq_reqmsg, request->rq_reqlen);
 604         if (rc != 0) {
 605                 CERROR ("error unpacking request: ptl %d from %s"
 606                         " xid "LPU64"\n", svc->srv_req_portal,
 607                         libcfs_id2str(request->rq_peer), request->rq_xid);
 608                 goto out;
 609         }
 610
 611         rc = lustre_unpack_ptlrpc_body(request->rq_reqmsg);
 612         if (rc) {
 613                 CERROR ("error unpacking ptlrpc body: ptl %d from %s"
 614                         " xid "LPU64"\n", svc->srv_req_portal,
 615                         libcfs_id2str(request->rq_peer), request->rq_xid);
 616                 goto out;
 617         }
 618
 619         rc = -EINVAL;
 620         if (lustre_msg_get_type(request->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
 621                 CERROR("wrong packet type received (type=%u) from %s\n",
 622                        lustre_msg_get_type(request->rq_reqmsg),
 623                        libcfs_id2str(request->rq_peer));
 624                 goto out;
 625         }
 626
 627         rc = lu_context_init(&request->rq_session, LCT_SESSION);
 628         if (rc) {
 629                 CERROR("Failure to initialize session: %d\n", rc);
 630                 goto out;
 631         }
 632         request->rq_session.lc_thread = thread;
 633         lu_context_enter(&request->rq_session);
 634
 635         CDEBUG(D_NET, "got req "LPD64"\n", request->rq_xid);
 636
 637         request->rq_svc_thread = thread;
 638         request->rq_export = class_conn2export(
 639                                      lustre_msg_get_handle(request->rq_reqmsg));
 640
 641         if (request->rq_export) {
 642                 if (lustre_msg_get_conn_cnt(request->rq_reqmsg) <
 643                     request->rq_export->exp_conn_cnt) {
 644                         DEBUG_REQ(D_ERROR, request,
 645                                   "DROPPING req from old connection %d < %d",
 646                                   lustre_msg_get_conn_cnt(request->rq_reqmsg),
 647                                   request->rq_export->exp_conn_cnt);
 648                         goto put_conn;
 649                 }
 650                 if (request->rq_export->exp_obd &&
 651                     request->rq_export->exp_obd->obd_fail) {
 652                         /* Failing over, don't handle any more reqs, send
 653                            error response instead. */
 654                         CDEBUG(D_HA, "Dropping req %p for failed obd %s\n",
 655                                request, request->rq_export->exp_obd->obd_name);
 656                         request->rq_status = -ENODEV;
 657                         ptlrpc_error(request);
 658                         goto put_conn;
 659                 }
 660
 661                 ptlrpc_update_export_timer(request->rq_export, timediff/500000);
 662         }
 663
 664         /* Discard requests queued for longer than my timeout.  If the
 665          * client's timeout is similar to mine, she'll be timing out this
 666          * REQ anyway (bug 1502) */
 667         if (timediff / 1000000 > (long)obd_timeout) {
 668                 CERROR("Dropping timed-out opc %d request from %s"
 669                        ": %ld seconds old\n",
 670                        lustre_msg_get_opc(request->rq_reqmsg),
 671                        libcfs_id2str(request->rq_peer),
 672                        timediff / 1000000);
 673                 goto put_conn;
 674         }
 675
 676         request->rq_phase = RQ_PHASE_INTERPRET;
 677
 678         CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
 679                "%s:%s+%d:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 680                (request->rq_export ?
 681                 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
 682                (request->rq_export ?
 683                 atomic_read(&request->rq_export->exp_refcount) : -99),
 684                lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
 685                libcfs_id2str(request->rq_peer),
 686                lustre_msg_get_opc(request->rq_reqmsg));
 687
 688         rc = svc->srv_handler(request);
 689
 690         request->rq_phase = RQ_PHASE_COMPLETE;
 691
 692         CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
 693                "%s:%s+%d:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 694                (request->rq_export ?
 695                 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
 696                (request->rq_export ?
 697                 atomic_read(&request->rq_export->exp_refcount) : -99),
 698                lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
 699                libcfs_id2str(request->rq_peer),
 700                lustre_msg_get_opc(request->rq_reqmsg));
 701
 702 put_conn:
 703         if (request->rq_export != NULL)
 704                 class_export_put(request->rq_export);
 705
 706  out:
 707         lu_context_exit(&request->rq_session);
 708         lu_context_fini(&request->rq_session);
 709
 710         do_gettimeofday(&work_end);
 711
 712         timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
 713
 714         if (timediff / 1000000 > (long)obd_timeout)
 715                 CERROR("request "LPU64" opc %u from %s processed in %lds "
 716                        "trans "LPU64" rc %d/%d\n",
 717                        request->rq_xid,
 718                        request->rq_reqmsg ?
 719                                 lustre_msg_get_opc(request->rq_reqmsg) : 0,
 720                        libcfs_id2str(request->rq_peer),
 721                        cfs_timeval_sub(&work_end, &request->rq_arrival_time,
 722                                        NULL) / 1000000,
 723                        request->rq_repmsg ?
 724                                 lustre_msg_get_transno(request->rq_repmsg) :
 725                                 request->rq_transno, request->rq_status,
 726                        request->rq_repmsg ?
 727                                 lustre_msg_get_status(request->rq_repmsg) :
 728                                  -999);
 729         else
 730                 CDEBUG(D_HA, "request "LPU64" opc %u from %s processed in "
 731                        "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
 732                        request->rq_xid,
 733                        request->rq_reqmsg ?
 734                                 lustre_msg_get_opc(request->rq_reqmsg) : 0,
 735                        libcfs_id2str(request->rq_peer), timediff,
 736                        cfs_timeval_sub(&work_end, &request->rq_arrival_time,
 737                                        NULL),
 738                        request->rq_transno, request->rq_status,
 739                        request->rq_repmsg ?
 740                                 lustre_msg_get_status(request->rq_repmsg) :
 741                                 -999);
 742
 743         if (svc->srv_stats != NULL && request->rq_reqmsg != NULL) {
 744                 int opc = opcode_offset(lustre_msg_get_opc(request->rq_reqmsg));
 745                 if (opc > 0) {
 746                         LASSERT(opc < LUSTRE_MAX_OPCODES);
 747                         lprocfs_counter_add(svc->srv_stats,
 748                                             opc + PTLRPC_LAST_CNTR,
 749                                             timediff);
 750                 }
 751         }
 752
 753         ptlrpc_server_free_request(request);
 754
 755         RETURN(1);
 756 }
 757
 758 static int
 759 ptlrpc_server_handle_reply (struct ptlrpc_service *svc)
 760 {
 761         struct ptlrpc_reply_state *rs;
 762         struct obd_export         *exp;
 763         struct obd_device         *obd;
 764         int                        nlocks;
 765         int                        been_handled;
 766         ENTRY;
 767
 768         spin_lock(&svc->srv_lock);
 769         if (list_empty (&svc->srv_reply_queue)) {
 770                 spin_unlock(&svc->srv_lock);
 771                 RETURN(0);
 772         }
 773
 774         rs = list_entry (svc->srv_reply_queue.next,
 775                          struct ptlrpc_reply_state, rs_list);
 776
 777         exp = rs->rs_export;
 778         obd = exp->exp_obd;
 779
 780         LASSERT (rs->rs_difficult);
 781         LASSERT (rs->rs_scheduled);
 782
 783         list_del_init (&rs->rs_list);
 784
 785         /* Disengage from notifiers carefully (lock order - irqrestore below!)*/
 786         spin_unlock(&svc->srv_lock);
 787
 788         spin_lock (&obd->obd_uncommitted_replies_lock);
 789         /* Noop if removed already */
 790         list_del_init (&rs->rs_obd_list);
 791         spin_unlock (&obd->obd_uncommitted_replies_lock);
 792
 793         spin_lock (&exp->exp_lock);
 794         /* Noop if removed already */
 795         list_del_init (&rs->rs_exp_list);
 796         spin_unlock (&exp->exp_lock);
 797
 798         spin_lock(&svc->srv_lock);
 799
 800         been_handled = rs->rs_handled;
 801         rs->rs_handled = 1;
 802
 803         nlocks = rs->rs_nlocks;                 /* atomic "steal", but */
 804         rs->rs_nlocks = 0;                      /* locks still on rs_locks! */
 805
 806         if (nlocks == 0 && !been_handled) {
 807                 /* If we see this, we should already have seen the warning
 808                  * in mds_steal_ack_locks()  */
 809                 CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
 810                       " o%d NID %s\n",
 811                       rs,
 812                       rs->rs_xid, rs->rs_transno,
 813                       lustre_msg_get_opc(rs->rs_msg),
 814                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
 815         }
 816
 817         if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
 818                 spin_unlock(&svc->srv_lock);
 819
 820                 if (!been_handled && rs->rs_on_net) {
 821                         LNetMDUnlink(rs->rs_md_h);
 822                         /* Ignore return code; we're racing with
 823                          * completion... */
 824                 }
 825
 826                 while (nlocks-- > 0)
 827                         ldlm_lock_decref(&rs->rs_locks[nlocks],
 828                                          rs->rs_modes[nlocks]);
 829
 830                 spin_lock(&svc->srv_lock);
 831         }
 832
 833         rs->rs_scheduled = 0;
 834
 835         if (!rs->rs_on_net) {
 836                 /* Off the net */
 837                 svc->srv_n_difficult_replies--;
 838                 spin_unlock(&svc->srv_lock);
 839
 840                 class_export_put (exp);
 841                 rs->rs_export = NULL;
 842                 ptlrpc_rs_decref (rs);
 843                 atomic_dec (&svc->srv_outstanding_replies);
 844                 RETURN(1);
 845         }
 846
 847         /* still on the net; callback will schedule */
 848         spin_unlock(&svc->srv_lock);
 849         RETURN(1);
 850 }
 851
 852 #ifndef __KERNEL__
 853 /* FIXME make use of timeout later */
 854 int
 855 liblustre_check_services (void *arg)
 856 {
 857         int  did_something = 0;
 858         int  rc;
 859         struct list_head *tmp, *nxt;
 860         ENTRY;
 861
 862         /* I'm relying on being single threaded, not to have to lock
 863          * ptlrpc_all_services etc */
 864         list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
 865                 struct ptlrpc_service *svc =
 866                         list_entry (tmp, struct ptlrpc_service, srv_list);
 867
 868                 if (svc->srv_nthreads != 0)     /* I've recursed */
 869                         continue;
 870
 871                 /* service threads can block for bulk, so this limits us
 872                  * (arbitrarily) to recursing 1 stack frame per service.
 873                  * Note that the problem with recursion is that we have to
 874                  * unwind completely before our caller can resume. */
 875
 876                 svc->srv_nthreads++;
 877
 878                 do {
 879                         rc = ptlrpc_server_handle_reply(svc);
 880                         rc |= ptlrpc_server_handle_request(svc, NULL);
 881                         rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
 882                         did_something |= rc;
 883                 } while (rc);
 884
 885                 svc->srv_nthreads--;
 886         }
 887
 888         RETURN(did_something);
 889 }
 890 #define ptlrpc_stop_all_threads(s) do {} while (0)
 891
 892 #else /* __KERNEL__ */
 893
 894 /* Don't use daemonize, it removes fs struct from new thread (bug 418) */
 895 void ptlrpc_daemonize(char *name)
 896 {
 897         struct fs_struct *fs = current->fs;
 898
 899         atomic_inc(&fs->count);
 900         cfs_daemonize(name);
 901         exit_fs(cfs_current());
 902         current->fs = fs;
 903         ll_set_fs_pwd(current->fs, init_task.fs->pwdmnt, init_task.fs->pwd);
 904 }
 905
 906 static void
 907 ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
 908 {
 909         int avail = svc->srv_nrqbd_receiving;
 910         int low_water = test_req_buffer_pressure ? 0 :
 911                         svc->srv_nbuf_per_group/2;
 912
 913         /* NB I'm not locking; just looking. */
 914
 915         /* CAVEAT EMPTOR: We might be allocating buffers here because we've
 916          * allowed the request history to grow out of control.  We could put a
 917          * sanity check on that here and cull some history if we need the
 918          * space. */
 919
 920         if (avail <= low_water)
 921                 ptlrpc_grow_req_bufs(svc);
 922
 923         if (svc->srv_stats)
 924                 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
 925                                     avail);
 926 }
 927
 928 static int
 929 ptlrpc_retry_rqbds(void *arg)
 930 {
 931         struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
 932
 933         svc->srv_rqbd_timeout = 0;
 934         return (-ETIMEDOUT);
 935 }
 936
 937 static int ptlrpc_main(void *arg)
 938 {
 939         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 940         struct ptlrpc_service  *svc = data->svc;
 941         struct ptlrpc_thread   *thread = data->thread;
 942         struct ptlrpc_reply_state *rs;
 943         struct lc_watchdog     *watchdog;
 944 #ifdef WITH_GROUP_INFO
 945         struct group_info *ginfo = NULL;
 946 #endif
 947         struct lu_context ctx;
 948         int rc = 0;
 949         ENTRY;
 950
 951         ptlrpc_daemonize(data->name);
 952
 953 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,9) && CONFIG_NUMA
 954         /* we need to do this before any per-thread allocation is done so that
 955          * we get the per-thread allocations on local node.  bug 7342 */
 956         if (svc->srv_cpu_affinity) {
 957                 int cpu, num_cpu;
 958
 959                 for (cpu = 0, num_cpu = 0; cpu < NR_CPUS; cpu++) {
 960                         if (!cpu_online(cpu))
 961                                 continue;
 962                         if (num_cpu == thread->t_id % num_online_cpus())
 963                                 break;
 964                         num_cpu++;
 965                 }
 966                 set_cpus_allowed(cfs_current(), node_to_cpumask(cpu_to_node(cpu)));
 967         }
 968 #endif
 969
 970 #ifdef WITH_GROUP_INFO
 971         ginfo = groups_alloc(0);
 972         if (!ginfo) {
 973                 rc = -ENOMEM;
 974                 goto out;
 975         }
 976
 977         set_current_groups(ginfo);
 978         put_group_info(ginfo);
 979 #endif
 980
 981         if (svc->srv_init != NULL) {
 982                 rc = svc->srv_init(thread);
 983                 if (rc)
 984                         goto out;
 985         }
 986
 987         rc = lu_context_init(&ctx, svc->srv_ctx_tags);
 988         if (rc)
 989                 goto out_srv_init;
 990
 991         thread->t_ctx = &ctx;
 992         ctx.lc_thread = thread;
 993
 994         /* Alloc reply state structure for this one */
 995         OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
 996         if (!rs) {
 997                 rc = -ENOMEM;
 998                 goto out_srv_init;
 999         }
1000
1001         /* Record that the thread is running */
1002         thread->t_flags = SVC_RUNNING;
1003         /*
1004          * wake up our creator. Note: @data is invalid after this point,
1005          * because it's allocated on ptlrpc_start_thread() stack.
1006          */
1007         cfs_waitq_signal(&thread->t_ctl_waitq);
1008
1009         watchdog = lc_watchdog_add(svc->srv_watchdog_timeout, NULL, NULL);
1010
1011         spin_lock(&svc->srv_lock);
1012         svc->srv_nthreads++;
1013         list_add(&rs->rs_list, &svc->srv_free_rs_list);
1014         spin_unlock(&svc->srv_lock);
1015         cfs_waitq_signal(&svc->srv_free_rs_waitq);
1016
1017         CDEBUG(D_NET, "service thread %d started\n", thread->t_id);
1018
1019         /* XXX maintain a list of all managed devices: insert here */
1020
1021         while ((thread->t_flags & SVC_STOPPING) == 0 ||
1022                svc->srv_n_difficult_replies != 0) {
1023                 /* Don't exit while there are replies to be handled */
1024                 struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
1025                                                      ptlrpc_retry_rqbds, svc);
1026
1027                 lc_watchdog_disable(watchdog);
1028
1029                 l_wait_event_exclusive (svc->srv_waitq,
1030                               ((thread->t_flags & SVC_STOPPING) != 0 &&
1031                                svc->srv_n_difficult_replies == 0) ||
1032                               (!list_empty(&svc->srv_idle_rqbds) &&
1033                                svc->srv_rqbd_timeout == 0) ||
1034                               !list_empty (&svc->srv_reply_queue) ||
1035                               (!list_empty (&svc->srv_request_queue) &&
1036                                (svc->srv_n_difficult_replies == 0 ||
1037                                 svc->srv_n_active_reqs <
1038                                 (svc->srv_nthreads - 1))),
1039                               &lwi);
1040
1041                 lc_watchdog_touch(watchdog);
1042
1043                 ptlrpc_check_rqbd_pool(svc);
1044
1045                 if (!list_empty (&svc->srv_reply_queue))
1046                         ptlrpc_server_handle_reply (svc);
1047
1048                 /* only handle requests if there are no difficult replies
1049                  * outstanding, or I'm not the last thread handling
1050                  * requests */
1051                 if (!list_empty (&svc->srv_request_queue) &&
1052                     (svc->srv_n_difficult_replies == 0 ||
1053                      svc->srv_n_active_reqs < (svc->srv_nthreads - 1))) {
1054                         lu_context_enter(&ctx);
1055                         ptlrpc_server_handle_request(svc, thread);
1056                         lu_context_exit(&ctx);
1057                 }
1058
1059                 if (!list_empty(&svc->srv_idle_rqbds) &&
1060                     ptlrpc_server_post_idle_rqbds(svc) < 0) {
1061                         /* I just failed to repost request buffers.  Wait
1062                          * for a timeout (unless something else happens)
1063                          * before I try again */
1064                         svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
1065                         CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
1066                                svc->srv_nrqbd_receiving);
1067                 }
1068         }
1069
1070         lc_watchdog_delete(watchdog);
1071
1072 out_srv_init:
1073         /*
1074          * deconstruct service specific state created by ptlrpc_start_thread()
1075          */
1076         if (svc->srv_done != NULL)
1077                 svc->srv_done(thread);
1078
1079 out:
1080         lu_context_fini(&ctx);
1081
1082         CDEBUG(D_NET, "service thread %d exiting: rc %d\n", thread->t_id, rc);
1083
1084         spin_lock(&svc->srv_lock);
1085         svc->srv_nthreads--;                    /* must know immediately */
1086         thread->t_id = rc;
1087         thread->t_flags = SVC_STOPPED;
1088
1089         cfs_waitq_signal(&thread->t_ctl_waitq);
1090         spin_unlock(&svc->srv_lock);
1091
1092         return rc;
1093 }
1094
1095 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
1096                                struct ptlrpc_thread *thread)
1097 {
1098         struct l_wait_info lwi = { 0 };
1099
1100         spin_lock(&svc->srv_lock);
1101         thread->t_flags = SVC_STOPPING;
1102         spin_unlock(&svc->srv_lock);
1103
1104         cfs_waitq_broadcast(&svc->srv_waitq);
1105         l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED),
1106                      &lwi);
1107
1108         spin_lock(&svc->srv_lock);
1109         list_del(&thread->t_link);
1110         spin_unlock(&svc->srv_lock);
1111
1112         OBD_FREE(thread, sizeof(*thread));
1113 }
1114
1115 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
1116 {
1117         struct ptlrpc_thread *thread;
1118
1119         spin_lock(&svc->srv_lock);
1120         while (!list_empty(&svc->srv_threads)) {
1121                 thread = list_entry(svc->srv_threads.next,
1122                                     struct ptlrpc_thread, t_link);
1123
1124                 spin_unlock(&svc->srv_lock);
1125                 ptlrpc_stop_thread(svc, thread);
1126                 spin_lock(&svc->srv_lock);
1127         }
1128
1129         spin_unlock(&svc->srv_lock);
1130 }
1131
1132 /* @base_name should be 11 characters or less - 3 will be added on */
1133 int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc,
1134                          char *base_name)
1135 {
1136         int i, rc = 0;
1137         ENTRY;
1138
1139         LASSERT(svc->srv_num_threads > 0);
1140         for (i = 0; i < svc->srv_num_threads; i++) {
1141                 char name[32];
1142                 sprintf(name, "%s_%02d", base_name, i);
1143                 rc = ptlrpc_start_thread(dev, svc, name, i);
1144                 if (rc) {
1145                         CERROR("cannot start %s thread #%d: rc %d\n", base_name,
1146                                i, rc);
1147                         ptlrpc_stop_all_threads(svc);
1148                 }
1149         }
1150         RETURN(rc);
1151 }
1152
1153 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
1154                         char *name, int id)
1155 {
1156         struct l_wait_info lwi = { 0 };
1157         struct ptlrpc_svc_data d;
1158         struct ptlrpc_thread *thread;
1159         int rc;
1160         ENTRY;
1161
1162         OBD_ALLOC(thread, sizeof(*thread));
1163         if (thread == NULL)
1164                 RETURN(-ENOMEM);
1165         cfs_waitq_init(&thread->t_ctl_waitq);
1166         thread->t_id = id;
1167
1168         spin_lock(&svc->srv_lock);
1169         list_add(&thread->t_link, &svc->srv_threads);
1170         spin_unlock(&svc->srv_lock);
1171
1172         d.dev = dev;
1173         d.svc = svc;
1174         d.name = name;
1175         d.thread = thread;
1176
1177         /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
1178          * just drop the VM and FILES in ptlrpc_daemonize() right away.
1179          */
1180         rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
1181         if (rc < 0) {
1182                 CERROR("cannot start thread '%s': rc %d\n", name, rc);
1183
1184                 spin_lock(&svc->srv_lock);
1185                 list_del(&thread->t_link);
1186                 spin_unlock(&svc->srv_lock);
1187
1188                 OBD_FREE(thread, sizeof(*thread));
1189                 RETURN(rc);
1190         }
1191         l_wait_event(thread->t_ctl_waitq,
1192                      thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
1193
1194         rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
1195         RETURN(rc);
1196 }
1197 #endif
1198
1199 int ptlrpc_unregister_service(struct ptlrpc_service *service)
1200 {
1201         int                   rc;
1202         struct l_wait_info    lwi;
1203         struct list_head     *tmp;
1204         struct ptlrpc_reply_state *rs, *t;
1205
1206         ptlrpc_stop_all_threads(service);
1207         LASSERT(list_empty(&service->srv_threads));
1208
1209         spin_lock (&ptlrpc_all_services_lock);
1210         list_del_init (&service->srv_list);
1211         spin_unlock (&ptlrpc_all_services_lock);
1212
1213         ptlrpc_lprocfs_unregister_service(service);
1214
1215         /* All history will be culled when the next request buffer is
1216          * freed */
1217         service->srv_max_history_rqbds = 0;
1218
1219         CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
1220
1221         rc = LNetClearLazyPortal(service->srv_req_portal);
1222         LASSERT (rc == 0);
1223
1224         /* Unlink all the request buffers.  This forces a 'final' event with
1225          * its 'unlink' flag set for each posted rqbd */
1226         list_for_each(tmp, &service->srv_active_rqbds) {
1227                 struct ptlrpc_request_buffer_desc *rqbd =
1228                         list_entry(tmp, struct ptlrpc_request_buffer_desc,
1229                                    rqbd_list);
1230
1231                 rc = LNetMDUnlink(rqbd->rqbd_md_h);
1232                 LASSERT (rc == 0 || rc == -ENOENT);
1233         }
1234
1235         /* Wait for the network to release any buffers it's currently
1236          * filling */
1237         for (;;) {
1238                 spin_lock(&service->srv_lock);
1239                 rc = service->srv_nrqbd_receiving;
1240                 spin_unlock(&service->srv_lock);
1241
1242                 if (rc == 0)
1243                         break;
1244
1245                 /* Network access will complete in finite time but the HUGE
1246                  * timeout lets us CWARN for visibility of sluggish NALs */
1247                 lwi = LWI_TIMEOUT(cfs_time_seconds(300), NULL, NULL);
1248                 rc = l_wait_event(service->srv_waitq,
1249                                   service->srv_nrqbd_receiving == 0,
1250                                   &lwi);
1251                 if (rc == -ETIMEDOUT)
1252                         CWARN("Service %s waiting for request buffers\n",
1253                               service->srv_name);
1254         }
1255
1256         /* schedule all outstanding replies to terminate them */
1257         spin_lock(&service->srv_lock);
1258         while (!list_empty(&service->srv_active_replies)) {
1259                 struct ptlrpc_reply_state *rs =
1260                         list_entry(service->srv_active_replies.next,
1261                                    struct ptlrpc_reply_state, rs_list);
1262                 ptlrpc_schedule_difficult_reply(rs);
1263         }
1264         spin_unlock(&service->srv_lock);
1265
1266         /* purge the request queue.  NB No new replies (rqbds all unlinked)
1267          * and no service threads, so I'm the only thread noodling the
1268          * request queue now */
1269         while (!list_empty(&service->srv_request_queue)) {
1270                 struct ptlrpc_request *req =
1271                         list_entry(service->srv_request_queue.next,
1272                                    struct ptlrpc_request,
1273                                    rq_list);
1274
1275                 list_del(&req->rq_list);
1276                 service->srv_n_queued_reqs--;
1277                 service->srv_n_active_reqs++;
1278
1279                 ptlrpc_server_free_request(req);
1280         }
1281         LASSERT(service->srv_n_queued_reqs == 0);
1282         LASSERT(service->srv_n_active_reqs == 0);
1283         LASSERT(service->srv_n_history_rqbds == 0);
1284         LASSERT(list_empty(&service->srv_active_rqbds));
1285
1286         /* Now free all the request buffers since nothing references them
1287          * any more... */
1288         while (!list_empty(&service->srv_idle_rqbds)) {
1289                 struct ptlrpc_request_buffer_desc *rqbd =
1290                         list_entry(service->srv_idle_rqbds.next,
1291                                    struct ptlrpc_request_buffer_desc,
1292                                    rqbd_list);
1293
1294                 ptlrpc_free_rqbd(rqbd);
1295         }
1296
1297         /* wait for all outstanding replies to complete (they were
1298          * scheduled having been flagged to abort above) */
1299         while (atomic_read(&service->srv_outstanding_replies) != 0) {
1300                 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10), NULL, NULL);
1301
1302                 rc = l_wait_event(service->srv_waitq,
1303                                   !list_empty(&service->srv_reply_queue), &lwi);
1304                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
1305
1306                 if (rc == 0) {
1307                         ptlrpc_server_handle_reply(service);
1308                         continue;
1309                 }
1310                 CWARN("Unexpectedly long timeout %p\n", service);
1311         }
1312
1313         list_for_each_entry_safe(rs, t, &service->srv_free_rs_list, rs_list) {
1314                 list_del(&rs->rs_list);
1315                 OBD_FREE(rs, service->srv_max_reply_size);
1316         }
1317
1318         OBD_FREE(service, sizeof(*service));
1319         return 0;
1320 }
1321
1322 /* Returns 0 if the service is healthy.
1323  *
1324  * Right now, it just checks to make sure that requests aren't languishing
1325  * in the queue.  We'll use this health check to govern whether a node needs
1326  * to be shot, so it's intentionally non-aggressive. */
1327 int ptlrpc_service_health_check(struct ptlrpc_service *svc)
1328 {
1329         struct ptlrpc_request *request;
1330         struct timeval         right_now;
1331         long                   timediff, cutoff;
1332         int                    rc = 0;
1333
1334         if (svc == NULL)
1335                 return 0;
1336
1337         spin_lock(&svc->srv_lock);
1338
1339         if (list_empty(&svc->srv_request_queue))
1340                 goto out;
1341
1342         request = list_entry(svc->srv_request_queue.next,
1343                              struct ptlrpc_request, rq_list);
1344
1345         do_gettimeofday(&right_now);
1346         timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
1347
1348         cutoff = obd_health_check_timeout;
1349
1350         if (timediff / 1000000 > cutoff) {
1351                 rc = -1;
1352                 goto out;
1353         }
1354
1355  out:
1356         spin_unlock(&svc->srv_lock);
1357         return rc;
1358 }