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