lustre/ptlrpc/pinger.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Portal-RPC reconnection and replay operations, for use in recovery.
   5  *
   6  *  Copyright (c) 2003 Cluster File Systems, Inc.
   7  *   Authors: Phil Schwan <phil@clusterfs.com>
   8  *            Mike Shaver <shaver@clusterfs.com>
   9  *
  10  *   This file is part of the Lustre file system, http://www.lustre.org
  11  *   Lustre is a trademark of Cluster File Systems, Inc.
  12  *
  13  *   You may have signed or agreed to another license before downloading
  14  *   this software.  If so, you are bound by the terms and conditions
  15  *   of that agreement, and the following does not apply to you.  See the
  16  *   LICENSE file included with this distribution for more information.
  17  *
  18  *   If you did not agree to a different license, then this copy of Lustre
  19  *   is open source software; you can redistribute it and/or modify it
  20  *   under the terms of version 2 of the GNU General Public License as
  21  *   published by the Free Software Foundation.
  22  *
  23  *   In either case, Lustre is distributed in the hope that it will be
  24  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  25  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *   license text for more details.
  27  */
  28
  29 #ifndef __KERNEL__
  30 #include <liblustre.h>
  31 #else
  32 #define DEBUG_SUBSYSTEM S_RPC
  33 #endif
  34
  35 #include <obd_support.h>
  36 #include <obd_class.h>
  37 #include "ptlrpc_internal.h"
  38
  39 struct semaphore pinger_sem;
  40 static struct list_head pinger_imports = CFS_LIST_HEAD_INIT(pinger_imports);
  41
  42 int ptlrpc_ping(struct obd_import *imp)
  43 {
  44         struct ptlrpc_request *req;
  45         int rc = 0;
  46         ENTRY;
  47
  48         req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, OBD_PING, 1, NULL, NULL);
  49         if (req) {
  50                 DEBUG_REQ(D_INFO, req, "pinging %s->%s",
  51                           imp->imp_obd->obd_uuid.uuid,
  52                           obd2cli_tgt(imp->imp_obd));
  53                 req->rq_no_resend = req->rq_no_delay = 1;
  54                 ptlrpc_req_set_repsize(req, 1, NULL);
  55                 req->rq_timeout = PING_INTERVAL;
  56                 ptlrpcd_add_req(req);
  57         } else {
  58                 CERROR("OOM trying to ping %s->%s\n",
  59                        imp->imp_obd->obd_uuid.uuid,
  60                        obd2cli_tgt(imp->imp_obd));
  61                 rc = -ENOMEM;
  62         }
  63
  64         RETURN(rc);
  65 }
  66
  67 static void ptlrpc_update_next_ping(struct obd_import *imp)
  68 {
  69         imp->imp_next_ping = cfs_time_shift(
  70                                 (imp->imp_state == LUSTRE_IMP_DISCON ?
  71                                  RECONNECT_INTERVAL : PING_INTERVAL));
  72 }
  73
  74 void ptlrpc_ping_import_soon(struct obd_import *imp)
  75 {
  76         imp->imp_next_ping = cfs_time_current();
  77 }
  78
  79 static inline int ptlrpc_next_reconnect(struct obd_import *imp)
  80 {
  81         if (imp->imp_server_timeout)
  82                 return cfs_time_shift(obd_timeout / 2);
  83         else
  84                 return cfs_time_shift(obd_timeout);
  85 }
  86
  87 static atomic_t suspend_timeouts = ATOMIC_INIT(0);
  88 static cfs_time_t suspend_wakeup_time = 0;
  89 static wait_queue_head_t suspend_timeouts_waitq;
  90
  91 cfs_time_t ptlrpc_suspend_wakeup_time(void)
  92 {
  93         return suspend_wakeup_time;
  94 }
  95
  96 void ptlrpc_deactivate_timeouts(struct obd_import *imp)
  97 {
  98         /*XXX: disabled for now, will be replaced by adaptive timeouts */
  99 #if 0
 100         if (imp->imp_no_timeout)
 101                 return;
 102         imp->imp_no_timeout = 1;
 103         atomic_inc(&suspend_timeouts);
 104         CDEBUG(D_HA|D_WARNING, "deactivate timeouts %u\n", atomic_read(&suspend_timeouts));
 105 #endif
 106 }
 107
 108 void ptlrpc_activate_timeouts(struct obd_import *imp)
 109 {
 110         /*XXX: disabled for now, will be replaced by adaptive timeouts */
 111 #if 0
 112         if (!imp->imp_no_timeout)
 113                 return;
 114         imp->imp_no_timeout = 0;
 115         LASSERT(atomic_read(&suspend_timeouts) > 0);
 116         if (atomic_dec_and_test(&suspend_timeouts)) {
 117                 suspend_wakeup_time = cfs_time_current();
 118                 wake_up(&suspend_timeouts_waitq);
 119         }
 120         CDEBUG(D_HA|D_WARNING, "activate timeouts %u\n", atomic_read(&suspend_timeouts));
 121 #endif
 122 }
 123
 124 int ptlrpc_check_suspend(void)
 125 {
 126         if (atomic_read(&suspend_timeouts))
 127                 return 1;
 128         return 0;
 129 }
 130
 131 int ptlrpc_check_and_wait_suspend(struct ptlrpc_request *req)
 132 {
 133         struct l_wait_info lwi;
 134
 135         if (atomic_read(&suspend_timeouts)) {
 136                 DEBUG_REQ(D_NET, req, "-- suspend %d regular timeout",
 137                           atomic_read(&suspend_timeouts));
 138                 lwi = LWI_INTR(NULL, NULL);
 139                 l_wait_event(suspend_timeouts_waitq,
 140                              atomic_read(&suspend_timeouts) == 0, &lwi);
 141                 DEBUG_REQ(D_NET, req, "-- recharge regular timeout");
 142                 return 1;
 143         }
 144         return 0;
 145 }
 146
 147 #ifdef __KERNEL__
 148
 149 static void ptlrpc_pinger_process_import(struct obd_import *imp,
 150                                          unsigned long this_ping)
 151 {
 152         int force, level;
 153
 154         spin_lock(&imp->imp_lock);
 155         level = imp->imp_state;
 156         force = imp->imp_force_verify;
 157         if (force)
 158                 imp->imp_force_verify = 0;
 159         spin_unlock(&imp->imp_lock);
 160
 161         CDEBUG(level == LUSTRE_IMP_FULL ? D_INFO : D_HA,
 162                "level %s/%u force %u deactive %u pingable %u\n",
 163                ptlrpc_import_state_name(level), level,
 164                force, imp->imp_deactive, imp->imp_pingable);
 165
 166         if (cfs_time_aftereq(imp->imp_next_ping - 5 * CFS_TICK,
 167                              this_ping) && force == 0)
 168                 return;
 169
 170         if (level == LUSTRE_IMP_DISCON && !imp->imp_deactive) {
 171                 /* wait at least a timeout before trying recovery again */
 172                 imp->imp_next_ping = ptlrpc_next_reconnect(imp);
 173                 ptlrpc_initiate_recovery(imp);
 174         } else if (level != LUSTRE_IMP_FULL ||
 175                    imp->imp_obd->obd_no_recov ||
 176                    imp->imp_deactive) {
 177                 CDEBUG(D_HA, "not pinging %s (in recovery "
 178                        " or recovery disabled: %s)\n",
 179                        obd2cli_tgt(imp->imp_obd),
 180                        ptlrpc_import_state_name(level));
 181         } else if (imp->imp_pingable || force) {
 182                 ptlrpc_ping(imp);
 183         }
 184 }
 185
 186 static int ptlrpc_pinger_main(void *arg)
 187 {
 188         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 189         struct ptlrpc_thread *thread = data->thread;
 190         ENTRY;
 191
 192         cfs_daemonize(data->name);
 193
 194         /* Record that the thread is running */
 195         thread->t_flags = SVC_RUNNING;
 196         cfs_waitq_signal(&thread->t_ctl_waitq);
 197
 198         /* And now, loop forever, pinging as needed. */
 199         while (1) {
 200                 cfs_time_t this_ping = cfs_time_current();
 201                 struct l_wait_info lwi;
 202                 cfs_duration_t time_to_next_ping;
 203                 struct list_head *iter;
 204
 205                 mutex_down(&pinger_sem);
 206                 list_for_each(iter, &pinger_imports) {
 207                         struct obd_import *imp =
 208                                 list_entry(iter, struct obd_import,
 209                                            imp_pinger_chain);
 210
 211                         ptlrpc_pinger_process_import(imp, this_ping);
 212                         /* obd_timeout might have changed */
 213                         if (imp->imp_pingable && imp->imp_next_ping &&
 214                             cfs_time_after(imp->imp_next_ping,
 215                                            cfs_time_add(this_ping,
 216                                                         cfs_time_seconds(PING_INTERVAL))))
 217                                 ptlrpc_update_next_ping(imp);
 218                 }
 219                 mutex_up(&pinger_sem);
 220
 221                 /* Wait until the next ping time, or until we're stopped. */
 222                 time_to_next_ping = cfs_time_sub(cfs_time_add(this_ping,
 223                                                  cfs_time_seconds(PING_INTERVAL)),
 224                                                  cfs_time_current());
 225
 226                 /* The ping sent by ptlrpc_send_rpc may get sent out
 227                    say .01 second after this.
 228                    ptlrpc_pinger_eending_on_import will then set the
 229                    next ping time to next_ping + .01 sec, which means
 230                    we will SKIP the next ping at next_ping, and the
 231                    ping will get sent 2 timeouts from now!  Beware. */
 232                 CDEBUG(D_INFO, "next ping in "CFS_DURATION_T" ("CFS_TIME_T")\n",
 233                                time_to_next_ping,
 234                                cfs_time_add(this_ping, cfs_time_seconds(PING_INTERVAL)));
 235                 if (time_to_next_ping > 0) {
 236                         lwi = LWI_TIMEOUT(max_t(cfs_duration_t, time_to_next_ping, cfs_time_seconds(1)),
 237                                           NULL, NULL);
 238                         l_wait_event(thread->t_ctl_waitq,
 239                                      thread->t_flags & (SVC_STOPPING|SVC_EVENT),
 240                                      &lwi);
 241                         if (thread->t_flags & SVC_STOPPING) {
 242                                 thread->t_flags &= ~SVC_STOPPING;
 243                                 EXIT;
 244                                 break;
 245                         } else if (thread->t_flags & SVC_EVENT) {
 246                                 /* woken after adding import to reset timer */
 247                                 thread->t_flags &= ~SVC_EVENT;
 248                         }
 249                 }
 250         }
 251
 252         thread->t_flags = SVC_STOPPED;
 253         cfs_waitq_signal(&thread->t_ctl_waitq);
 254
 255         CDEBUG(D_NET, "pinger thread exiting, process %d\n", cfs_curproc_pid());
 256         return 0;
 257 }
 258
 259 static struct ptlrpc_thread *pinger_thread = NULL;
 260
 261 int ptlrpc_start_pinger(void)
 262 {
 263         struct l_wait_info lwi = { 0 };
 264         struct ptlrpc_svc_data d;
 265         int rc;
 266 #ifndef ENABLE_PINGER
 267         return 0;
 268 #endif
 269         ENTRY;
 270
 271         if (pinger_thread != NULL)
 272                 RETURN(-EALREADY);
 273
 274         OBD_ALLOC_PTR(pinger_thread);
 275         if (pinger_thread == NULL)
 276                 RETURN(-ENOMEM);
 277         cfs_waitq_init(&pinger_thread->t_ctl_waitq);
 278         cfs_waitq_init(&suspend_timeouts_waitq);
 279
 280         d.name = "ll_ping";
 281         d.thread = pinger_thread;
 282
 283         /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
 284          * just drop the VM and FILES in ptlrpc_daemonize() right away. */
 285         rc = cfs_kernel_thread(ptlrpc_pinger_main, &d, CLONE_VM | CLONE_FILES);
 286         if (rc < 0) {
 287                 CERROR("cannot start thread: %d\n", rc);
 288                 OBD_FREE(pinger_thread, sizeof(*pinger_thread));
 289                 pinger_thread = NULL;
 290                 RETURN(rc);
 291         }
 292         l_wait_event(pinger_thread->t_ctl_waitq,
 293                      pinger_thread->t_flags & SVC_RUNNING, &lwi);
 294
 295         RETURN(0);
 296 }
 297
 298 int ptlrpc_stop_pinger(void)
 299 {
 300         struct l_wait_info lwi = { 0 };
 301         int rc = 0;
 302 #ifndef ENABLE_PINGER
 303         return 0;
 304 #endif
 305         ENTRY;
 306
 307         if (pinger_thread == NULL)
 308                 RETURN(-EALREADY);
 309         mutex_down(&pinger_sem);
 310         pinger_thread->t_flags = SVC_STOPPING;
 311         cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
 312         mutex_up(&pinger_sem);
 313
 314         l_wait_event(pinger_thread->t_ctl_waitq,
 315                      (pinger_thread->t_flags & SVC_STOPPED), &lwi);
 316
 317         OBD_FREE_PTR(pinger_thread);
 318         pinger_thread = NULL;
 319         RETURN(rc);
 320 }
 321
 322 void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
 323 {
 324         ptlrpc_update_next_ping(imp);
 325 }
 326
 327 int ptlrpc_pinger_add_import(struct obd_import *imp)
 328 {
 329         ENTRY;
 330         if (!list_empty(&imp->imp_pinger_chain))
 331                 RETURN(-EALREADY);
 332
 333         mutex_down(&pinger_sem);
 334         CDEBUG(D_HA, "adding pingable import %s->%s\n",
 335                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 336         /* if we add to pinger we want recovery on this import */
 337         imp->imp_obd->obd_no_recov = 0;
 338         ptlrpc_update_next_ping(imp);
 339         /* XXX sort, blah blah */
 340         list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
 341         class_import_get(imp);
 342
 343         ptlrpc_pinger_wake_up();
 344         mutex_up(&pinger_sem);
 345
 346         RETURN(0);
 347 }
 348
 349 int ptlrpc_pinger_del_import(struct obd_import *imp)
 350 {
 351         ENTRY;
 352         if (list_empty(&imp->imp_pinger_chain))
 353                 RETURN(-ENOENT);
 354
 355         mutex_down(&pinger_sem);
 356         list_del_init(&imp->imp_pinger_chain);
 357         CDEBUG(D_HA, "removing pingable import %s->%s\n",
 358                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 359         /* if we remove from pinger we don't want recovery on this import */
 360         imp->imp_obd->obd_no_recov = 1;
 361         class_import_put(imp);
 362         mutex_up(&pinger_sem);
 363         RETURN(0);
 364 }
 365
 366 void ptlrpc_pinger_wake_up()
 367 {
 368 #ifdef ENABLE_PINGER
 369         pinger_thread->t_flags |= SVC_EVENT;
 370         cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
 371 #endif
 372 }
 373
 374 /* Ping evictor thread */
 375 #define PET_READY     1
 376 #define PET_TERMINATE 2
 377
 378 static int               pet_refcount = 0;
 379 static int               pet_state;
 380 static wait_queue_head_t pet_waitq;
 381 static struct obd_export *pet_exp = NULL;
 382 static spinlock_t        pet_lock = SPIN_LOCK_UNLOCKED;
 383
 384 int ping_evictor_wake(struct obd_export *exp)
 385 {
 386         spin_lock(&pet_lock);
 387         if (pet_exp) {
 388                 /* eventually the new obd will call here again. */
 389                 spin_unlock(&pet_lock);
 390                 return 1;
 391         }
 392
 393         /* We have to make sure the obd isn't destroyed between now and when
 394          * the ping evictor runs.  We'll take a reference here, and drop it
 395          * when we finish in the evictor.  We don't really care about this
 396          * export in particular; we just need one to keep the obd alive. */
 397         pet_exp = class_export_get(exp);
 398         spin_unlock(&pet_lock);
 399
 400         wake_up(&pet_waitq);
 401         return 0;
 402 }
 403
 404 static int ping_evictor_main(void *arg)
 405 {
 406         struct obd_device *obd;
 407         struct obd_export *exp;
 408         struct l_wait_info lwi = { 0 };
 409         time_t expire_time;
 410         ENTRY;
 411
 412         ptlrpc_daemonize("ll_evictor");
 413
 414         CDEBUG(D_HA, "Starting Ping Evictor\n");
 415         pet_exp = NULL;
 416         pet_state = PET_READY;
 417         while (1) {
 418                 l_wait_event(pet_waitq, pet_exp ||
 419                              (pet_state == PET_TERMINATE), &lwi);
 420                 if (pet_state == PET_TERMINATE)
 421                         break;
 422
 423                 /* we only get here if pet_exp != NULL, and the end of this
 424                  * loop is the only place which sets it NULL again, so lock
 425                  * is not strictly necessary. */
 426                 spin_lock(&pet_lock);
 427                 obd = pet_exp->exp_obd;
 428                 spin_unlock(&pet_lock);
 429
 430                 expire_time = CURRENT_SECONDS - (3 * obd_timeout / 2);
 431
 432                 CDEBUG(D_HA, "evicting all exports of obd %s older than %ld\n",
 433                        obd->obd_name, expire_time);
 434
 435                 /* Exports can't be deleted out of the list while we hold
 436                  * the obd lock (class_unlink_export), which means we can't
 437                  * lose the last ref on the export.  If they've already been
 438                  * removed from the list, we won't find them here. */
 439                 spin_lock(&obd->obd_dev_lock);
 440                 while (!list_empty(&obd->obd_exports_timed)) {
 441                         exp = list_entry(obd->obd_exports_timed.next,
 442                                          struct obd_export,exp_obd_chain_timed);
 443                         if (expire_time > exp->exp_last_request_time) {
 444                                 class_export_get(exp);
 445                                 spin_unlock(&obd->obd_dev_lock);
 446                                  LCONSOLE_WARN("%s: haven't heard from client %s"
 447                                               " (at %s) in %ld seconds. I think"
 448                                               " it's dead, and I am evicting"
 449                                               " it. exp %p, cur %ld expire %ld"
 450                                               " last %ld\n",
 451                                               obd->obd_name,
 452                                               obd_uuid2str(&exp->exp_client_uuid),
 453                                               obd_export_nid2str(exp),
 454                                               (long)(CURRENT_SECONDS -
 455                                                      exp->exp_last_request_time),
 456                                               exp, (long)CURRENT_SECONDS,
 457                                               (long)expire_time,
 458                                               (long)exp->exp_last_request_time);
 459                                 CDEBUG(D_HA, "Last request was at %ld\n",
 460                                        exp->exp_last_request_time);
 461                                 class_fail_export(exp);
 462                                 class_export_put(exp);
 463                                 spin_lock(&obd->obd_dev_lock);
 464                         } else {
 465                                 /* List is sorted, so everyone below is ok */
 466                                 break;
 467                         }
 468                 }
 469                 spin_unlock(&obd->obd_dev_lock);
 470
 471                 class_export_put(pet_exp);
 472
 473                 spin_lock(&pet_lock);
 474                 pet_exp = NULL;
 475                 spin_unlock(&pet_lock);
 476         }
 477         CDEBUG(D_HA, "Exiting Ping Evictor\n");
 478
 479         RETURN(0);
 480 }
 481
 482 void ping_evictor_start(void)
 483 {
 484         int rc;
 485
 486         if (++pet_refcount > 1)
 487                 return;
 488
 489         init_waitqueue_head(&pet_waitq);
 490
 491         rc = cfs_kernel_thread(ping_evictor_main, NULL, CLONE_VM | CLONE_FILES);
 492         if (rc < 0) {
 493                 pet_refcount--;
 494                 CERROR("Cannot start ping evictor thread: %d\n", rc);
 495         }
 496 }
 497 EXPORT_SYMBOL(ping_evictor_start);
 498
 499 void ping_evictor_stop(void)
 500 {
 501         if (--pet_refcount > 0)
 502                 return;
 503
 504         pet_state = PET_TERMINATE;
 505         wake_up(&pet_waitq);
 506 }
 507 EXPORT_SYMBOL(ping_evictor_stop);
 508 #else /* !__KERNEL__ */
 509
 510 /* XXX
 511  * the current implementation of pinger in liblustre is not optimized
 512  */
 513
 514 #ifdef ENABLE_PINGER
 515 static struct pinger_data {
 516         int             pd_recursion;
 517         cfs_time_t      pd_this_ping;   /* jiffies */
 518         cfs_time_t      pd_next_ping;   /* jiffies */
 519         struct ptlrpc_request_set *pd_set;
 520 } pinger_args;
 521
 522 static int pinger_check_rpcs(void *arg)
 523 {
 524         cfs_time_t curtime = cfs_time_current();
 525         struct ptlrpc_request *req;
 526         struct ptlrpc_request_set *set;
 527         struct list_head *iter;
 528         struct pinger_data *pd = &pinger_args;
 529         int rc;
 530
 531         /* prevent recursion */
 532         if (pd->pd_recursion++) {
 533                 CDEBUG(D_HA, "pinger: recursion! quit\n");
 534                 LASSERT(pd->pd_set);
 535                 pd->pd_recursion--;
 536                 return 0;
 537         }
 538
 539         /* have we reached ping point? */
 540         if (!pd->pd_set && time_before(curtime, pd->pd_next_ping)) {
 541                 pd->pd_recursion--;
 542                 return 0;
 543         }
 544
 545         /* if we have rpc_set already, continue processing it */
 546         if (pd->pd_set) {
 547                 LASSERT(pd->pd_this_ping);
 548                 set = pd->pd_set;
 549                 goto do_check_set;
 550         }
 551
 552         pd->pd_this_ping = curtime;
 553         pd->pd_set = ptlrpc_prep_set();
 554         if (pd->pd_set == NULL)
 555                 goto out;
 556         set = pd->pd_set;
 557
 558         /* add rpcs into set */
 559         mutex_down(&pinger_sem);
 560         list_for_each(iter, &pinger_imports) {
 561                 struct obd_import *imp =
 562                         list_entry(iter, struct obd_import, imp_pinger_chain);
 563                 int generation, level;
 564
 565                 if (cfs_time_aftereq(pd->pd_this_ping,
 566                                      imp->imp_next_ping - 5 * CFS_TICK)) {
 567                         /* Add a ping. */
 568                         spin_lock(&imp->imp_lock);
 569                         generation = imp->imp_generation;
 570                         level = imp->imp_state;
 571                         spin_unlock(&imp->imp_lock);
 572
 573                         if (level != LUSTRE_IMP_FULL) {
 574                                 CDEBUG(D_HA,
 575                                        "not pinging %s (in recovery)\n",
 576                                        obd2cli_tgt(imp->imp_obd));
 577                                 continue;
 578                         }
 579
 580                         req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, OBD_PING,
 581                                               1, NULL, NULL);
 582                         if (!req) {
 583                                 CERROR("out of memory\n");
 584                                 break;
 585                         }
 586                         req->rq_no_resend = 1;
 587                         ptlrpc_req_set_repsize(req, 1, NULL);
 588                         req->rq_send_state = LUSTRE_IMP_FULL;
 589                         req->rq_phase = RQ_PHASE_RPC;
 590                         req->rq_import_generation = generation;
 591                         ptlrpc_set_add_req(set, req);
 592                 } else {
 593                         CDEBUG(D_HA, "don't need to ping %s ("CFS_TIME_T" > "
 594                                CFS_TIME_T")\n", obd2cli_tgt(imp->imp_obd),
 595                                imp->imp_next_ping, pd->pd_this_ping);
 596                 }
 597         }
 598         pd->pd_this_ping = curtime;
 599         mutex_up(&pinger_sem);
 600
 601         /* Might be empty, that's OK. */
 602         if (set->set_remaining == 0)
 603                 CDEBUG(D_HA, "nothing to ping\n");
 604
 605         list_for_each(iter, &set->set_requests) {
 606                 struct ptlrpc_request *req =
 607                         list_entry(iter, struct ptlrpc_request,
 608                                    rq_set_chain);
 609                 DEBUG_REQ(D_HA, req, "pinging %s->%s",
 610                           req->rq_import->imp_obd->obd_uuid.uuid,
 611                           obd2cli_tgt(req->rq_import->imp_obd));
 612                 (void)ptl_send_rpc(req, 0);
 613         }
 614
 615 do_check_set:
 616         rc = ptlrpc_check_set(set);
 617
 618         /* not finished, and we are not expired, simply return */
 619         if (!rc && cfs_time_before(curtime,
 620                                    cfs_time_add(pd->pd_this_ping,
 621                                                 cfs_time_seconds(PING_INTERVAL)))) {
 622                 CDEBUG(D_HA, "not finished, but also not expired\n");
 623                 pd->pd_recursion--;
 624                 return 0;
 625         }
 626
 627         /* Expire all the requests that didn't come back. */
 628         mutex_down(&pinger_sem);
 629         list_for_each(iter, &set->set_requests) {
 630                 req = list_entry(iter, struct ptlrpc_request,
 631                                  rq_set_chain);
 632
 633                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 634                         continue;
 635
 636                 req->rq_phase = RQ_PHASE_COMPLETE;
 637                 atomic_dec(&req->rq_import->imp_inflight);
 638                 set->set_remaining--;
 639                 /* If it was disconnected, don't sweat it. */
 640                 if (list_empty(&req->rq_import->imp_pinger_chain)) {
 641                         ptlrpc_unregister_reply(req);
 642                         continue;
 643                 }
 644
 645                 CDEBUG(D_HA, "pinger initiate expire_one_request\n");
 646                 ptlrpc_expire_one_request(req);
 647         }
 648         mutex_up(&pinger_sem);
 649
 650         ptlrpc_set_destroy(set);
 651         pd->pd_set = NULL;
 652
 653 out:
 654         pd->pd_next_ping = cfs_time_add(pd->pd_this_ping,
 655                                         cfs_time_seconds(PING_INTERVAL));
 656         pd->pd_this_ping = 0; /* XXX for debug */
 657
 658         CDEBUG(D_HA, "finished a round ping\n");
 659         pd->pd_recursion--;
 660         return 0;
 661 }
 662
 663 static void *pinger_callback = NULL;
 664 #endif /* ENABLE_PINGER */
 665
 666 int ptlrpc_start_pinger(void)
 667 {
 668 #ifdef ENABLE_PINGER
 669         memset(&pinger_args, 0, sizeof(pinger_args));
 670         pinger_callback = liblustre_register_wait_callback("pinger_check_rpcs",
 671                                                            &pinger_check_rpcs,
 672                                                            &pinger_args);
 673 #endif
 674         return 0;
 675 }
 676
 677 int ptlrpc_stop_pinger(void)
 678 {
 679 #ifdef ENABLE_PINGER
 680         if (pinger_callback)
 681                 liblustre_deregister_wait_callback(pinger_callback);
 682 #endif
 683         return 0;
 684 }
 685
 686 void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
 687 {
 688 #ifdef ENABLE_PINGER
 689         mutex_down(&pinger_sem);
 690         ptlrpc_update_next_ping(imp);
 691         if (pinger_args.pd_set == NULL &&
 692             time_before(imp->imp_next_ping, pinger_args.pd_next_ping)) {
 693                 CDEBUG(D_HA, "set next ping to "CFS_TIME_T"(cur "CFS_TIME_T")\n",
 694                         imp->imp_next_ping, cfs_time_current());
 695                 pinger_args.pd_next_ping = imp->imp_next_ping;
 696         }
 697         mutex_up(&pinger_sem);
 698 #endif
 699 }
 700
 701 int ptlrpc_pinger_add_import(struct obd_import *imp)
 702 {
 703         ENTRY;
 704         if (!list_empty(&imp->imp_pinger_chain))
 705                 RETURN(-EALREADY);
 706
 707         CDEBUG(D_HA, "adding pingable import %s->%s\n",
 708                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 709         ptlrpc_pinger_sending_on_import(imp);
 710
 711         mutex_down(&pinger_sem);
 712         list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
 713         class_import_get(imp);
 714         mutex_up(&pinger_sem);
 715
 716         RETURN(0);
 717 }
 718
 719 int ptlrpc_pinger_del_import(struct obd_import *imp)
 720 {
 721         ENTRY;
 722         if (list_empty(&imp->imp_pinger_chain))
 723                 RETURN(-ENOENT);
 724
 725         mutex_down(&pinger_sem);
 726         list_del_init(&imp->imp_pinger_chain);
 727         CDEBUG(D_HA, "removing pingable import %s->%s\n",
 728                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 729         class_import_put(imp);
 730         mutex_up(&pinger_sem);
 731         RETURN(0);
 732 }
 733
 734 void ptlrpc_pinger_wake_up()
 735 {
 736 #ifdef ENABLE_PINGER
 737         /* XXX force pinger to run, if needed */
 738         struct obd_import *imp;
 739         ENTRY;
 740         list_for_each_entry(imp, &pinger_imports, imp_pinger_chain) {
 741                 CDEBUG(D_HA, "Checking that we need to do anything about import"
 742                              " %s->%s\n", imp->imp_obd->obd_uuid.uuid,
 743                              obd2cli_tgt(imp->imp_obd));
 744 #ifdef ENABLE_LIBLUSTRE_RECOVERY
 745                 if (imp->imp_state == LUSTRE_IMP_DISCON && !imp->imp_deactive)
 746 #else
 747                 /*XXX only recover for the initial connection */
 748                 if (!lustre_handle_is_used(&imp->imp_remote_handle) &&
 749                     imp->imp_state == LUSTRE_IMP_DISCON && !imp->imp_deactive)
 750 #endif
 751                         ptlrpc_initiate_recovery(imp);
 752                 else if (imp->imp_state != LUSTRE_IMP_FULL)
 753                         CDEBUG(D_HA, "Refused to recover import %s->%s "
 754                                      "state %d, deactive %d\n",
 755                                      imp->imp_obd->obd_uuid.uuid,
 756                                      obd2cli_tgt(imp->imp_obd), imp->imp_state,
 757                                      imp->imp_deactive);
 758         }
 759         EXIT;
 760 #endif
 761 }
 762 #endif /* !__KERNEL__ */