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