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