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 CFS_LIST_HEAD(pinger_imports);
  41
  42 int ptlrpc_ping(struct obd_import *imp)
  43 {
  44         struct ptlrpc_request *req;
  45         ENTRY;
  46
  47         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
  48                                         OBD_PING);
  49         if (req == NULL) {
  50                 CERROR("OOM trying to ping %s->%s\n",
  51                        imp->imp_obd->obd_uuid.uuid,
  52                        obd2cli_tgt(imp->imp_obd));
  53                 RETURN(-ENOMEM);
  54         }
  55
  56         DEBUG_REQ(D_INFO, req, "pinging %s->%s",
  57                   imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
  58         req->rq_no_resend = req->rq_no_delay = 1;
  59         ptlrpc_request_set_replen(req);
  60         req->rq_timeout = PING_INTERVAL;
  61         ptlrpcd_add_req(req);
  62
  63         RETURN(0);
  64 }
  65
  66 void ptlrpc_update_next_ping(struct obd_import *imp)
  67 {
  68 #ifdef ENABLE_PINGER
  69         imp->imp_next_ping = cfs_time_shift(
  70                                 (imp->imp_state == LUSTRE_IMP_DISCON ?
  71                                  RECONNECT_INTERVAL : PING_INTERVAL));
  72 #endif /* ENABLE_PINGER */
  73 }
  74
  75 void ptlrpc_ping_import_soon(struct obd_import *imp)
  76 {
  77         imp->imp_next_ping = cfs_time_current();
  78 }
  79
  80 static inline int ptlrpc_next_reconnect(struct obd_import *imp)
  81 {
  82         if (imp->imp_server_timeout)
  83                 return cfs_time_shift(obd_timeout / 2);
  84         else
  85                 return cfs_time_shift(obd_timeout);
  86 }
  87
  88 static atomic_t suspend_timeouts = ATOMIC_INIT(0);
  89 static cfs_time_t suspend_wakeup_time = 0;
  90
  91 #ifdef __KERNEL__
  92 static wait_queue_head_t suspend_timeouts_waitq;
  93 #endif
  94
  95 cfs_time_t ptlrpc_suspend_wakeup_time(void)
  96 {
  97         return suspend_wakeup_time;
  98 }
  99
 100 void ptlrpc_deactivate_timeouts(struct obd_import *imp)
 101 {
 102         /*XXX: disabled for now, will be replaced by adaptive timeouts */
 103 #if 0
 104         if (imp->imp_no_timeout)
 105                 return;
 106         imp->imp_no_timeout = 1;
 107         atomic_inc(&suspend_timeouts);
 108         CDEBUG(D_HA|D_WARNING, "deactivate timeouts %u\n", atomic_read(&suspend_timeouts));
 109 #endif
 110 }
 111
 112 void ptlrpc_activate_timeouts(struct obd_import *imp)
 113 {
 114         /*XXX: disabled for now, will be replaced by adaptive timeouts */
 115 #if 0
 116         if (!imp->imp_no_timeout)
 117                 return;
 118         imp->imp_no_timeout = 0;
 119         LASSERT(atomic_read(&suspend_timeouts) > 0);
 120         if (atomic_dec_and_test(&suspend_timeouts)) {
 121                 suspend_wakeup_time = cfs_time_current();
 122                 wake_up(&suspend_timeouts_waitq);
 123         }
 124         CDEBUG(D_HA|D_WARNING, "activate timeouts %u\n", atomic_read(&suspend_timeouts));
 125 #endif
 126 }
 127
 128 int ptlrpc_check_suspend(void)
 129 {
 130         if (atomic_read(&suspend_timeouts))
 131                 return 1;
 132         return 0;
 133 }
 134
 135 int ptlrpc_check_and_wait_suspend(struct ptlrpc_request *req)
 136 {
 137         struct l_wait_info lwi;
 138
 139         if (atomic_read(&suspend_timeouts)) {
 140                 DEBUG_REQ(D_NET, req, "-- suspend %d regular timeout",
 141                           atomic_read(&suspend_timeouts));
 142                 lwi = LWI_INTR(NULL, NULL);
 143                 l_wait_event(suspend_timeouts_waitq,
 144                              atomic_read(&suspend_timeouts) == 0, &lwi);
 145                 DEBUG_REQ(D_NET, req, "-- recharge regular timeout");
 146                 return 1;
 147         }
 148         return 0;
 149 }
 150
 151 #ifdef __KERNEL__
 152
 153 static void ptlrpc_pinger_process_import(struct obd_import *imp,
 154                                          unsigned long this_ping)
 155 {
 156         int force, level;
 157
 158         spin_lock(&imp->imp_lock);
 159         level = imp->imp_state;
 160         force = imp->imp_force_verify;
 161         if (force)
 162                 imp->imp_force_verify = 0;
 163         spin_unlock(&imp->imp_lock);
 164
 165         CDEBUG(level == LUSTRE_IMP_FULL ? D_INFO : D_HA,
 166                "level %s/%u force %u deactive %u pingable %u\n",
 167                ptlrpc_import_state_name(level), level,
 168                force, imp->imp_deactive, imp->imp_pingable);
 169
 170         if (cfs_time_aftereq(imp->imp_next_ping - 5 * CFS_TICK,
 171                              this_ping) && force == 0)
 172                 return;
 173
 174         if (level == LUSTRE_IMP_DISCON && !imp->imp_deactive) {
 175                 /* wait at least a timeout before trying recovery again */
 176                 imp->imp_next_ping = ptlrpc_next_reconnect(imp);
 177                 ptlrpc_initiate_recovery(imp);
 178         } else if (level != LUSTRE_IMP_FULL ||
 179                    imp->imp_obd->obd_no_recov ||
 180                    imp->imp_deactive) {
 181                 CDEBUG(D_HA, "not pinging %s (in recovery "
 182                        " or recovery disabled: %s)\n",
 183                        obd2cli_tgt(imp->imp_obd),
 184                        ptlrpc_import_state_name(level));
 185         } else if (imp->imp_pingable || force) {
 186                 ptlrpc_ping(imp);
 187         }
 188 }
 189
 190 static int ptlrpc_pinger_main(void *arg)
 191 {
 192         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 193         struct ptlrpc_thread *thread = data->thread;
 194         ENTRY;
 195
 196         cfs_daemonize(data->name);
 197
 198         /* Record that the thread is running */
 199         thread->t_flags = SVC_RUNNING;
 200         cfs_waitq_signal(&thread->t_ctl_waitq);
 201
 202         /* And now, loop forever, pinging as needed. */
 203         while (1) {
 204                 cfs_time_t this_ping = cfs_time_current();
 205                 struct l_wait_info lwi;
 206                 cfs_duration_t time_to_next_ping;
 207                 struct list_head *iter;
 208
 209                 mutex_down(&pinger_sem);
 210                 list_for_each(iter, &pinger_imports) {
 211                         struct obd_import *imp =
 212                                 list_entry(iter, struct obd_import,
 213                                            imp_pinger_chain);
 214
 215                         ptlrpc_pinger_process_import(imp, this_ping);
 216                         /* obd_timeout might have changed */
 217                         if (imp->imp_pingable && imp->imp_next_ping &&
 218                             cfs_time_after(imp->imp_next_ping,
 219                                            cfs_time_add(this_ping,
 220                                                         cfs_time_seconds(PING_INTERVAL))))
 221                                 ptlrpc_update_next_ping(imp);
 222                 }
 223                 mutex_up(&pinger_sem);
 224                 /* update memory usage info */
 225                 obd_update_maxusage();
 226
 227                 /* Wait until the next ping time, or until we're stopped. */
 228                 time_to_next_ping = cfs_time_sub(cfs_time_add(this_ping,
 229                                                cfs_time_seconds(PING_INTERVAL)),
 230                                                cfs_time_current());
 231
 232                 /* The ping sent by ptlrpc_send_rpc may get sent out
 233                    say .01 second after this.
 234                    ptlrpc_pinger_sending_on_import will then set the
 235                    next ping time to next_ping + .01 sec, which means
 236                    we will SKIP the next ping at next_ping, and the
 237                    ping will get sent 2 timeouts from now!  Beware. */
 238                 CDEBUG(D_INFO, "next ping in "CFS_DURATION_T" ("CFS_TIME_T")\n",
 239                                time_to_next_ping,
 240                                cfs_time_add(this_ping,
 241                                             cfs_time_seconds(PING_INTERVAL)));
 242                 if (time_to_next_ping > 0) {
 243                         lwi = LWI_TIMEOUT(max_t(cfs_duration_t,
 244                                                 time_to_next_ping,
 245                                                 cfs_time_seconds(1)),
 246                                           NULL, NULL);
 247                         l_wait_event(thread->t_ctl_waitq,
 248                                      thread->t_flags & (SVC_STOPPING|SVC_EVENT),
 249                                      &lwi);
 250                         if (thread->t_flags & SVC_STOPPING) {
 251                                 thread->t_flags &= ~SVC_STOPPING;
 252                                 EXIT;
 253                                 break;
 254                         } else if (thread->t_flags & SVC_EVENT) {
 255                                 /* woken after adding import to reset timer */
 256                                 thread->t_flags &= ~SVC_EVENT;
 257                         }
 258                 }
 259         }
 260
 261         thread->t_flags = SVC_STOPPED;
 262         cfs_waitq_signal(&thread->t_ctl_waitq);
 263
 264         CDEBUG(D_NET, "pinger thread exiting, process %d\n", cfs_curproc_pid());
 265         return 0;
 266 }
 267
 268 static struct ptlrpc_thread *pinger_thread = NULL;
 269
 270 int ptlrpc_start_pinger(void)
 271 {
 272         struct l_wait_info lwi = { 0 };
 273         struct ptlrpc_svc_data d;
 274         int rc;
 275 #ifndef ENABLE_PINGER
 276         return 0;
 277 #endif
 278         ENTRY;
 279
 280         if (pinger_thread != NULL)
 281                 RETURN(-EALREADY);
 282
 283         OBD_ALLOC_PTR(pinger_thread);
 284         if (pinger_thread == NULL)
 285                 RETURN(-ENOMEM);
 286         cfs_waitq_init(&pinger_thread->t_ctl_waitq);
 287         cfs_waitq_init(&suspend_timeouts_waitq);
 288
 289         d.name = "ll_ping";
 290         d.thread = pinger_thread;
 291
 292         /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
 293          * just drop the VM and FILES in ptlrpc_daemonize() right away. */
 294         rc = cfs_kernel_thread(ptlrpc_pinger_main, &d, CLONE_VM | CLONE_FILES);
 295         if (rc < 0) {
 296                 CERROR("cannot start thread: %d\n", rc);
 297                 OBD_FREE(pinger_thread, sizeof(*pinger_thread));
 298                 pinger_thread = NULL;
 299                 RETURN(rc);
 300         }
 301         l_wait_event(pinger_thread->t_ctl_waitq,
 302                      pinger_thread->t_flags & SVC_RUNNING, &lwi);
 303
 304         RETURN(0);
 305 }
 306
 307 int ptlrpc_stop_pinger(void)
 308 {
 309         struct l_wait_info lwi = { 0 };
 310         int rc = 0;
 311 #ifndef ENABLE_PINGER
 312         return 0;
 313 #endif
 314         ENTRY;
 315
 316         if (pinger_thread == NULL)
 317                 RETURN(-EALREADY);
 318         mutex_down(&pinger_sem);
 319         pinger_thread->t_flags = SVC_STOPPING;
 320         cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
 321         mutex_up(&pinger_sem);
 322
 323         l_wait_event(pinger_thread->t_ctl_waitq,
 324                      (pinger_thread->t_flags & SVC_STOPPED), &lwi);
 325
 326         OBD_FREE_PTR(pinger_thread);
 327         pinger_thread = NULL;
 328         RETURN(rc);
 329 }
 330
 331 void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
 332 {
 333         ptlrpc_update_next_ping(imp);
 334 }
 335
 336 int ptlrpc_pinger_add_import(struct obd_import *imp)
 337 {
 338         ENTRY;
 339         if (!list_empty(&imp->imp_pinger_chain))
 340                 RETURN(-EALREADY);
 341
 342         mutex_down(&pinger_sem);
 343         CDEBUG(D_HA, "adding pingable import %s->%s\n",
 344                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 345         /* if we add to pinger we want recovery on this import */
 346         imp->imp_obd->obd_no_recov = 0;
 347         ptlrpc_update_next_ping(imp);
 348         /* XXX sort, blah blah */
 349         list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
 350         class_import_get(imp);
 351
 352         ptlrpc_pinger_wake_up();
 353         mutex_up(&pinger_sem);
 354
 355         RETURN(0);
 356 }
 357
 358 int ptlrpc_pinger_del_import(struct obd_import *imp)
 359 {
 360         ENTRY;
 361         if (list_empty(&imp->imp_pinger_chain))
 362                 RETURN(-ENOENT);
 363
 364         mutex_down(&pinger_sem);
 365         list_del_init(&imp->imp_pinger_chain);
 366         CDEBUG(D_HA, "removing pingable import %s->%s\n",
 367                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 368         /* if we remove from pinger we don't want recovery on this import */
 369         imp->imp_obd->obd_no_recov = 1;
 370         class_import_put(imp);
 371         mutex_up(&pinger_sem);
 372         RETURN(0);
 373 }
 374
 375 void ptlrpc_pinger_wake_up()
 376 {
 377 #ifdef ENABLE_PINGER
 378         pinger_thread->t_flags |= SVC_EVENT;
 379         cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
 380 #endif
 381 }
 382
 383 /* Ping evictor thread */
 384 #define PET_READY     1
 385 #define PET_TERMINATE 2
 386
 387 static int               pet_refcount = 0;
 388 static int               pet_state;
 389 static wait_queue_head_t pet_waitq;
 390 static struct obd_export *pet_exp = NULL;
 391 static spinlock_t        pet_lock = SPIN_LOCK_UNLOCKED;
 392
 393 int ping_evictor_wake(struct obd_export *exp)
 394 {
 395         spin_lock(&pet_lock);
 396         if (pet_exp || (pet_state != PET_READY)) {
 397                 /* eventually the new obd will call here again. */
 398                 spin_unlock(&pet_lock);
 399                 return 1;
 400         }
 401
 402         /* We have to make sure the obd isn't destroyed between now and when
 403          * the ping evictor runs.  We'll take a reference here, and drop it
 404          * when we finish in the evictor.  We don't really care about this
 405          * export in particular; we just need one to keep the obd alive. */
 406         pet_exp = class_export_get(exp);
 407         spin_unlock(&pet_lock);
 408
 409         wake_up(&pet_waitq);
 410         return 0;
 411 }
 412
 413 static int ping_evictor_main(void *arg)
 414 {
 415         struct obd_device *obd;
 416         struct obd_export *exp;
 417         struct l_wait_info lwi = { 0 };
 418         time_t expire_time;
 419         ENTRY;
 420
 421         ptlrpc_daemonize("ll_evictor");
 422
 423         CDEBUG(D_HA, "Starting Ping Evictor\n");
 424         pet_exp = NULL;
 425         pet_state = PET_READY;
 426         while (1) {
 427                 l_wait_event(pet_waitq, pet_exp ||
 428                              (pet_state == PET_TERMINATE), &lwi);
 429                 if (pet_state == PET_TERMINATE)
 430                         break;
 431
 432                 /* we only get here if pet_exp != NULL, and the end of this
 433                  * loop is the only place which sets it NULL again, so lock
 434                  * is not strictly necessary. */
 435                 spin_lock(&pet_lock);
 436                 obd = pet_exp->exp_obd;
 437                 spin_unlock(&pet_lock);
 438
 439                 expire_time = cfs_time_current_sec() - (3 * obd_timeout / 2);
 440
 441                 CDEBUG(D_HA, "evicting all exports of obd %s older than %ld\n",
 442                        obd->obd_name, expire_time);
 443
 444                 /* Exports can't be deleted out of the list while we hold
 445                  * the obd lock (class_unlink_export), which means we can't
 446                  * lose the last ref on the export.  If they've already been
 447                  * removed from the list, we won't find them here. */
 448                 spin_lock(&obd->obd_dev_lock);
 449                 while (!list_empty(&obd->obd_exports_timed)) {
 450                         exp = list_entry(obd->obd_exports_timed.next,
 451                                          struct obd_export,exp_obd_chain_timed);
 452                         if (expire_time > exp->exp_last_request_time) {
 453                                 class_export_get(exp);
 454                                 spin_unlock(&obd->obd_dev_lock);
 455                                  LCONSOLE_WARN("%s: haven't heard from client %s"
 456                                               " (at %s) in %ld seconds. I think"
 457                                               " it's dead, and I am evicting"
 458                                               " it. exp %p, cur %ld expire %ld"
 459                                               " last %ld\n",
 460                                               obd->obd_name,
 461                                               obd_uuid2str(&exp->exp_client_uuid),
 462                                               obd_export_nid2str(exp),
 463                                               (long)(cfs_time_current_sec() -
 464                                                      exp->exp_last_request_time),
 465                                               exp, (long)cfs_time_current_sec(),
 466                                               (long)expire_time,
 467                                               (long)exp->exp_last_request_time);
 468                                 CDEBUG(D_HA, "Last request was at %ld\n",
 469                                        exp->exp_last_request_time);
 470                                 class_fail_export(exp);
 471                                 class_export_put(exp);
 472                                 spin_lock(&obd->obd_dev_lock);
 473                         } else {
 474                                 /* List is sorted, so everyone below is ok */
 475                                 break;
 476                         }
 477                 }
 478                 spin_unlock(&obd->obd_dev_lock);
 479
 480                 class_export_put(pet_exp);
 481
 482                 spin_lock(&pet_lock);
 483                 pet_exp = NULL;
 484                 spin_unlock(&pet_lock);
 485         }
 486         CDEBUG(D_HA, "Exiting Ping Evictor\n");
 487
 488         RETURN(0);
 489 }
 490
 491 void ping_evictor_start(void)
 492 {
 493         int rc;
 494
 495         if (++pet_refcount > 1)
 496                 return;
 497
 498         init_waitqueue_head(&pet_waitq);
 499
 500         rc = cfs_kernel_thread(ping_evictor_main, NULL, CLONE_VM | CLONE_FILES);
 501         if (rc < 0) {
 502                 pet_refcount--;
 503                 CERROR("Cannot start ping evictor thread: %d\n", rc);
 504         }
 505 }
 506 EXPORT_SYMBOL(ping_evictor_start);
 507
 508 void ping_evictor_stop(void)
 509 {
 510         if (--pet_refcount > 0)
 511                 return;
 512
 513         pet_state = PET_TERMINATE;
 514         wake_up(&pet_waitq);
 515 }
 516 EXPORT_SYMBOL(ping_evictor_stop);
 517 #else /* !__KERNEL__ */
 518
 519 /* XXX
 520  * the current implementation of pinger in liblustre is not optimized
 521  */
 522
 523 #ifdef ENABLE_PINGER
 524 static struct pinger_data {
 525         int             pd_recursion;
 526         cfs_time_t      pd_this_ping;   /* jiffies */
 527         cfs_time_t      pd_next_ping;   /* jiffies */
 528         struct ptlrpc_request_set *pd_set;
 529 } pinger_args;
 530
 531 static int pinger_check_rpcs(void *arg)
 532 {
 533         cfs_time_t curtime = cfs_time_current();
 534         struct ptlrpc_request *req;
 535         struct ptlrpc_request_set *set;
 536         struct list_head *iter;
 537         struct pinger_data *pd = &pinger_args;
 538         int rc;
 539
 540         /* prevent recursion */
 541         if (pd->pd_recursion++) {
 542                 CDEBUG(D_HA, "pinger: recursion! quit\n");
 543                 LASSERT(pd->pd_set);
 544                 pd->pd_recursion--;
 545                 return 0;
 546         }
 547
 548         /* have we reached ping point? */
 549         if (!pd->pd_set && time_before(curtime, pd->pd_next_ping)) {
 550                 pd->pd_recursion--;
 551                 return 0;
 552         }
 553
 554         /* if we have rpc_set already, continue processing it */
 555         if (pd->pd_set) {
 556                 LASSERT(pd->pd_this_ping);
 557                 set = pd->pd_set;
 558                 goto do_check_set;
 559         }
 560
 561         pd->pd_this_ping = curtime;
 562         pd->pd_set = ptlrpc_prep_set();
 563         if (pd->pd_set == NULL)
 564                 goto out;
 565         set = pd->pd_set;
 566
 567         /* add rpcs into set */
 568         mutex_down(&pinger_sem);
 569         list_for_each(iter, &pinger_imports) {
 570                 struct obd_import *imp =
 571                         list_entry(iter, struct obd_import, imp_pinger_chain);
 572                 int generation, level;
 573
 574                 if (cfs_time_aftereq(pd->pd_this_ping,
 575                                      imp->imp_next_ping - 5 * CFS_TICK)) {
 576                         /* Add a ping. */
 577                         spin_lock(&imp->imp_lock);
 578                         generation = imp->imp_generation;
 579                         level = imp->imp_state;
 580                         spin_unlock(&imp->imp_lock);
 581
 582                         if (level != LUSTRE_IMP_FULL) {
 583                                 CDEBUG(D_HA,
 584                                        "not pinging %s (in recovery)\n",
 585                                        obd2cli_tgt(imp->imp_obd));
 586                                 continue;
 587                         }
 588
 589                         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING,
 590                                                         LUSTRE_OBD_VERSION,
 591                                                         OBD_PING);
 592                         if (req == NULL) {
 593                                 CERROR("OOM trying to ping %s->%s\n",
 594                                        imp->imp_obd->obd_uuid.uuid,
 595                                        obd2cli_tgt(imp->imp_obd));
 596                                 break;
 597                         }
 598
 599                         req->rq_no_resend = 1;
 600                         ptlrpc_request_set_replen(req);
 601                         req->rq_send_state = LUSTRE_IMP_FULL;
 602                         req->rq_phase = RQ_PHASE_RPC;
 603                         req->rq_import_generation = generation;
 604                         ptlrpc_set_add_req(set, req);
 605                 } else {
 606                         CDEBUG(D_INFO, "don't need to ping %s ("CFS_TIME_T
 607                                " > "CFS_TIME_T")\n", obd2cli_tgt(imp->imp_obd),
 608                                imp->imp_next_ping, pd->pd_this_ping);
 609                 }
 610         }
 611         pd->pd_this_ping = curtime;
 612         mutex_up(&pinger_sem);
 613
 614         /* Might be empty, that's OK. */
 615         if (set->set_remaining == 0)
 616                 CDEBUG(D_RPCTRACE, "nothing to ping\n");
 617
 618         list_for_each(iter, &set->set_requests) {
 619                 struct ptlrpc_request *req =
 620                         list_entry(iter, struct ptlrpc_request,
 621                                    rq_set_chain);
 622                 DEBUG_REQ(D_RPCTRACE, req, "pinging %s->%s",
 623                           req->rq_import->imp_obd->obd_uuid.uuid,
 624                           obd2cli_tgt(req->rq_import->imp_obd));
 625                 (void)ptl_send_rpc(req, 0);
 626         }
 627
 628 do_check_set:
 629         rc = ptlrpc_check_set(set);
 630
 631         /* not finished, and we are not expired, simply return */
 632         if (!rc && cfs_time_before(curtime, cfs_time_add(pd->pd_this_ping,
 633                                             cfs_time_seconds(PING_INTERVAL)))) {
 634                 CDEBUG(D_RPCTRACE, "not finished, but also not expired\n");
 635                 pd->pd_recursion--;
 636                 return 0;
 637         }
 638
 639         /* Expire all the requests that didn't come back. */
 640         mutex_down(&pinger_sem);
 641         list_for_each(iter, &set->set_requests) {
 642                 req = list_entry(iter, struct ptlrpc_request,
 643                                  rq_set_chain);
 644
 645                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 646                         continue;
 647
 648                 req->rq_phase = RQ_PHASE_COMPLETE;
 649                 atomic_dec(&req->rq_import->imp_inflight);
 650                 set->set_remaining--;
 651                 /* If it was disconnected, don't sweat it. */
 652                 if (list_empty(&req->rq_import->imp_pinger_chain)) {
 653                         ptlrpc_unregister_reply(req);
 654                         continue;
 655                 }
 656
 657                 CDEBUG(D_RPCTRACE, "pinger initiate expire_one_request\n");
 658                 ptlrpc_expire_one_request(req);
 659         }
 660         mutex_up(&pinger_sem);
 661
 662         ptlrpc_set_destroy(set);
 663         pd->pd_set = NULL;
 664
 665 out:
 666         pd->pd_next_ping = cfs_time_add(pd->pd_this_ping,
 667                                         cfs_time_seconds(PING_INTERVAL));
 668         pd->pd_this_ping = 0; /* XXX for debug */
 669
 670         CDEBUG(D_INFO, "finished a round ping\n");
 671         pd->pd_recursion--;
 672         return 0;
 673 }
 674
 675 static void *pinger_callback = NULL;
 676 #endif /* ENABLE_PINGER */
 677
 678 int ptlrpc_start_pinger(void)
 679 {
 680 #ifdef ENABLE_PINGER
 681         memset(&pinger_args, 0, sizeof(pinger_args));
 682         pinger_callback = liblustre_register_wait_callback("pinger_check_rpcs",
 683                                                            &pinger_check_rpcs,
 684                                                            &pinger_args);
 685 #endif
 686         return 0;
 687 }
 688
 689 int ptlrpc_stop_pinger(void)
 690 {
 691 #ifdef ENABLE_PINGER
 692         if (pinger_callback)
 693                 liblustre_deregister_wait_callback(pinger_callback);
 694 #endif
 695         return 0;
 696 }
 697
 698 void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
 699 {
 700 #ifdef ENABLE_PINGER
 701         mutex_down(&pinger_sem);
 702         ptlrpc_update_next_ping(imp);
 703         if (pinger_args.pd_set == NULL &&
 704             time_before(imp->imp_next_ping, pinger_args.pd_next_ping)) {
 705                 CDEBUG(D_HA, "set next ping to "CFS_TIME_T"(cur "CFS_TIME_T")\n",
 706                         imp->imp_next_ping, cfs_time_current());
 707                 pinger_args.pd_next_ping = imp->imp_next_ping;
 708         }
 709         mutex_up(&pinger_sem);
 710 #endif
 711 }
 712
 713 int ptlrpc_pinger_add_import(struct obd_import *imp)
 714 {
 715         ENTRY;
 716         if (!list_empty(&imp->imp_pinger_chain))
 717                 RETURN(-EALREADY);
 718
 719         CDEBUG(D_HA, "adding pingable import %s->%s\n",
 720                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 721         ptlrpc_pinger_sending_on_import(imp);
 722
 723         mutex_down(&pinger_sem);
 724         list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
 725         class_import_get(imp);
 726         mutex_up(&pinger_sem);
 727
 728         RETURN(0);
 729 }
 730
 731 int ptlrpc_pinger_del_import(struct obd_import *imp)
 732 {
 733         ENTRY;
 734         if (list_empty(&imp->imp_pinger_chain))
 735                 RETURN(-ENOENT);
 736
 737         mutex_down(&pinger_sem);
 738         list_del_init(&imp->imp_pinger_chain);
 739         CDEBUG(D_HA, "removing pingable import %s->%s\n",
 740                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 741         class_import_put(imp);
 742         mutex_up(&pinger_sem);
 743         RETURN(0);
 744 }
 745
 746 void ptlrpc_pinger_wake_up()
 747 {
 748 #ifdef ENABLE_PINGER
 749         /* XXX force pinger to run, if needed */
 750         struct obd_import *imp;
 751         ENTRY;
 752         list_for_each_entry(imp, &pinger_imports, imp_pinger_chain) {
 753                 CDEBUG(D_RPCTRACE, "checking import %s->%s\n",
 754                        imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 755 #ifdef ENABLE_LIBLUSTRE_RECOVERY
 756                 if (imp->imp_state == LUSTRE_IMP_DISCON && !imp->imp_deactive)
 757 #else
 758                 /*XXX only recover for the initial connection */
 759                 if (!lustre_handle_is_used(&imp->imp_remote_handle) &&
 760                     imp->imp_state == LUSTRE_IMP_DISCON && !imp->imp_deactive)
 761 #endif
 762                         ptlrpc_initiate_recovery(imp);
 763                 else if (imp->imp_state != LUSTRE_IMP_FULL)
 764                         CDEBUG(D_HA, "Refused to recover import %s->%s "
 765                                      "state %d, deactive %d\n",
 766                                      imp->imp_obd->obd_uuid.uuid,
 767                                      obd2cli_tgt(imp->imp_obd), imp->imp_state,
 768                                      imp->imp_deactive);
 769         }
 770         EXIT;
 771 #endif
 772 }
 773 #endif /* !__KERNEL__ */