lustre/ptlrpc/pinger.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/pinger.c
  37  *
  38  * Portal-RPC reconnection and replay operations, for use in recovery.
  39  */
  40
  41 #ifndef __KERNEL__
  42 #include <liblustre.h>
  43 #else
  44 #define DEBUG_SUBSYSTEM S_RPC
  45 #endif
  46
  47 #include <obd_support.h>
  48 #include <obd_class.h>
  49 #include "ptlrpc_internal.h"
  50
  51 static int suppress_pings;
  52 CFS_MODULE_PARM(suppress_pings, "i", int, 0644, "Suppress pings");
  53
  54 struct mutex pinger_mutex;
  55 static CFS_LIST_HEAD(pinger_imports);
  56 static cfs_list_t timeout_list = CFS_LIST_HEAD_INIT(timeout_list);
  57
  58 int ptlrpc_pinger_suppress_pings()
  59 {
  60         return suppress_pings;
  61 }
  62 EXPORT_SYMBOL(ptlrpc_pinger_suppress_pings);
  63
  64 struct ptlrpc_request *
  65 ptlrpc_prep_ping(struct obd_import *imp)
  66 {
  67         struct ptlrpc_request *req;
  68
  69         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING,
  70                                         LUSTRE_OBD_VERSION, OBD_PING);
  71         if (req) {
  72                 ptlrpc_request_set_replen(req);
  73                 req->rq_no_resend = req->rq_no_delay = 1;
  74         }
  75         return req;
  76 }
  77
  78 int ptlrpc_obd_ping(struct obd_device *obd)
  79 {
  80         int rc;
  81         struct ptlrpc_request *req;
  82         ENTRY;
  83
  84         req = ptlrpc_prep_ping(obd->u.cli.cl_import);
  85         if (req == NULL)
  86                 RETURN(-ENOMEM);
  87
  88         req->rq_send_state = LUSTRE_IMP_FULL;
  89
  90         rc = ptlrpc_queue_wait(req);
  91
  92         ptlrpc_req_finished(req);
  93
  94         RETURN(rc);
  95 }
  96 EXPORT_SYMBOL(ptlrpc_obd_ping);
  97
  98 int ptlrpc_ping(struct obd_import *imp)
  99 {
 100         struct ptlrpc_request *req;
 101         ENTRY;
 102
 103         req = ptlrpc_prep_ping(imp);
 104         if (req == NULL) {
 105                 CERROR("OOM trying to ping %s->%s\n",
 106                        imp->imp_obd->obd_uuid.uuid,
 107                        obd2cli_tgt(imp->imp_obd));
 108                 RETURN(-ENOMEM);
 109         }
 110
 111         DEBUG_REQ(D_INFO, req, "pinging %s->%s",
 112                   imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 113         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 114
 115         RETURN(0);
 116 }
 117
 118 void ptlrpc_update_next_ping(struct obd_import *imp, int soon)
 119 {
 120 #ifdef ENABLE_PINGER
 121         int time = soon ? PING_INTERVAL_SHORT : PING_INTERVAL;
 122         if (imp->imp_state == LUSTRE_IMP_DISCON) {
 123                 int dtime = max_t(int, CONNECTION_SWITCH_MIN,
 124                                   AT_OFF ? 0 :
 125                                   at_get(&imp->imp_at.iat_net_latency));
 126                 time = min(time, dtime);
 127         }
 128         imp->imp_next_ping = cfs_time_shift(time);
 129 #endif /* ENABLE_PINGER */
 130 }
 131
 132 void ptlrpc_ping_import_soon(struct obd_import *imp)
 133 {
 134         imp->imp_next_ping = cfs_time_current();
 135 }
 136
 137 static inline int imp_is_deactive(struct obd_import *imp)
 138 {
 139         return (imp->imp_deactive ||
 140                 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_IMP_DEACTIVE));
 141 }
 142
 143 static inline int ptlrpc_next_reconnect(struct obd_import *imp)
 144 {
 145         if (imp->imp_server_timeout)
 146                 return cfs_time_shift(obd_timeout / 2);
 147         else
 148                 return cfs_time_shift(obd_timeout);
 149 }
 150
 151 static cfs_atomic_t suspend_timeouts = CFS_ATOMIC_INIT(0);
 152 static cfs_time_t suspend_wakeup_time = 0;
 153
 154 cfs_duration_t pinger_check_timeout(cfs_time_t time)
 155 {
 156         struct timeout_item *item;
 157         cfs_time_t timeout = PING_INTERVAL;
 158
 159         /* The timeout list is a increase order sorted list */
 160         mutex_lock(&pinger_mutex);
 161         cfs_list_for_each_entry(item, &timeout_list, ti_chain) {
 162                 int ti_timeout = item->ti_timeout;
 163                 if (timeout > ti_timeout)
 164                         timeout = ti_timeout;
 165                 break;
 166         }
 167         mutex_unlock(&pinger_mutex);
 168
 169         return cfs_time_sub(cfs_time_add(time, cfs_time_seconds(timeout)),
 170                                          cfs_time_current());
 171 }
 172
 173 static cfs_waitq_t suspend_timeouts_waitq;
 174
 175 cfs_time_t ptlrpc_suspend_wakeup_time(void)
 176 {
 177         return suspend_wakeup_time;
 178 }
 179
 180 void ptlrpc_deactivate_timeouts(struct obd_import *imp)
 181 {
 182         /*XXX: disabled for now, will be replaced by adaptive timeouts */
 183 #if 0
 184         if (imp->imp_no_timeout)
 185                 return;
 186         imp->imp_no_timeout = 1;
 187         cfs_atomic_inc(&suspend_timeouts);
 188         CDEBUG(D_HA|D_WARNING, "deactivate timeouts %u\n",
 189                cfs_atomic_read(&suspend_timeouts));
 190 #endif
 191 }
 192
 193 void ptlrpc_activate_timeouts(struct obd_import *imp)
 194 {
 195         /*XXX: disabled for now, will be replaced by adaptive timeouts */
 196 #if 0
 197         if (!imp->imp_no_timeout)
 198                 return;
 199         imp->imp_no_timeout = 0;
 200         LASSERT(cfs_atomic_read(&suspend_timeouts) > 0);
 201         if (cfs_atomic_dec_and_test(&suspend_timeouts)) {
 202                 suspend_wakeup_time = cfs_time_current();
 203                 cfs_waitq_signal(&suspend_timeouts_waitq);
 204         }
 205         CDEBUG(D_HA|D_WARNING, "activate timeouts %u\n",
 206                cfs_atomic_read(&suspend_timeouts));
 207 #endif
 208 }
 209
 210 int ptlrpc_check_suspend(void)
 211 {
 212         if (cfs_atomic_read(&suspend_timeouts))
 213                 return 1;
 214         return 0;
 215 }
 216
 217 int ptlrpc_check_and_wait_suspend(struct ptlrpc_request *req)
 218 {
 219         struct l_wait_info lwi;
 220
 221         if (cfs_atomic_read(&suspend_timeouts)) {
 222                 DEBUG_REQ(D_NET, req, "-- suspend %d regular timeout",
 223                           cfs_atomic_read(&suspend_timeouts));
 224                 lwi = LWI_INTR(NULL, NULL);
 225                 l_wait_event(suspend_timeouts_waitq,
 226                              cfs_atomic_read(&suspend_timeouts) == 0, &lwi);
 227                 DEBUG_REQ(D_NET, req, "-- recharge regular timeout");
 228                 return 1;
 229         }
 230         return 0;
 231 }
 232
 233 #ifdef __KERNEL__
 234
 235 static bool ir_up;
 236
 237 void ptlrpc_pinger_ir_up(void)
 238 {
 239         CDEBUG(D_HA, "IR up\n");
 240         ir_up = true;
 241 }
 242 EXPORT_SYMBOL(ptlrpc_pinger_ir_up);
 243
 244 void ptlrpc_pinger_ir_down(void)
 245 {
 246         CDEBUG(D_HA, "IR down\n");
 247         ir_up = false;
 248 }
 249 EXPORT_SYMBOL(ptlrpc_pinger_ir_down);
 250
 251 static void ptlrpc_pinger_process_import(struct obd_import *imp,
 252                                          unsigned long this_ping)
 253 {
 254         int level;
 255         int force;
 256         int force_next;
 257         int suppress;
 258
 259         spin_lock(&imp->imp_lock);
 260
 261         level = imp->imp_state;
 262         force = imp->imp_force_verify;
 263         force_next = imp->imp_force_next_verify;
 264         /*
 265          * This will be used below only if the import is "FULL".
 266          */
 267         suppress = ir_up && OCD_HAS_FLAG(&imp->imp_connect_data, PINGLESS);
 268
 269         imp->imp_force_verify = 0;
 270
 271         if (cfs_time_aftereq(imp->imp_next_ping - 5 * CFS_TICK, this_ping) &&
 272             !force) {
 273                 spin_unlock(&imp->imp_lock);
 274                 return;
 275         }
 276
 277         imp->imp_force_next_verify = 0;
 278
 279         spin_unlock(&imp->imp_lock);
 280
 281         CDEBUG(level == LUSTRE_IMP_FULL ? D_INFO : D_HA, "%s->%s: level %s/%u "
 282                "force %u force_next %u deactive %u pingable %u suppress %u\n",
 283                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd),
 284                ptlrpc_import_state_name(level), level, force, force_next,
 285                imp->imp_deactive, imp->imp_pingable, suppress);
 286
 287         if (level == LUSTRE_IMP_DISCON && !imp_is_deactive(imp)) {
 288                 /* wait for a while before trying recovery again */
 289                 imp->imp_next_ping = ptlrpc_next_reconnect(imp);
 290                 if (!imp->imp_no_pinger_recover)
 291                         ptlrpc_initiate_recovery(imp);
 292         } else if (level != LUSTRE_IMP_FULL ||
 293                    imp->imp_obd->obd_no_recov ||
 294                    imp_is_deactive(imp)) {
 295                 CDEBUG(D_HA, "%s->%s: not pinging (in recovery "
 296                        "or recovery disabled: %s)\n",
 297                        imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd),
 298                        ptlrpc_import_state_name(level));
 299         } else if ((imp->imp_pingable && !suppress) || force_next || force) {
 300                 ptlrpc_ping(imp);
 301         }
 302 }
 303
 304 static int ptlrpc_pinger_main(void *arg)
 305 {
 306         struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
 307         ENTRY;
 308
 309         cfs_daemonize(thread->t_name);
 310
 311         /* Record that the thread is running */
 312         thread_set_flags(thread, SVC_RUNNING);
 313         cfs_waitq_signal(&thread->t_ctl_waitq);
 314
 315         /* And now, loop forever, pinging as needed. */
 316         while (1) {
 317                 cfs_time_t this_ping = cfs_time_current();
 318                 struct l_wait_info lwi;
 319                 cfs_duration_t time_to_next_wake;
 320                 struct timeout_item *item;
 321                 cfs_list_t *iter;
 322
 323                 mutex_lock(&pinger_mutex);
 324                 cfs_list_for_each_entry(item, &timeout_list, ti_chain) {
 325                         item->ti_cb(item, item->ti_cb_data);
 326                 }
 327                 cfs_list_for_each(iter, &pinger_imports) {
 328                         struct obd_import *imp =
 329                                 cfs_list_entry(iter, struct obd_import,
 330                                                imp_pinger_chain);
 331
 332                         ptlrpc_pinger_process_import(imp, this_ping);
 333                         /* obd_timeout might have changed */
 334                         if (imp->imp_pingable && imp->imp_next_ping &&
 335                             cfs_time_after(imp->imp_next_ping,
 336                                            cfs_time_add(this_ping,
 337                                                         cfs_time_seconds(PING_INTERVAL))))
 338                                 ptlrpc_update_next_ping(imp, 0);
 339                 }
 340                 mutex_unlock(&pinger_mutex);
 341                 /* update memory usage info */
 342                 obd_update_maxusage();
 343
 344                 /* Wait until the next ping time, or until we're stopped. */
 345                 time_to_next_wake = pinger_check_timeout(this_ping);
 346                 /* The ping sent by ptlrpc_send_rpc may get sent out
 347                    say .01 second after this.
 348                    ptlrpc_pinger_sending_on_import will then set the
 349                    next ping time to next_ping + .01 sec, which means
 350                    we will SKIP the next ping at next_ping, and the
 351                    ping will get sent 2 timeouts from now!  Beware. */
 352                 CDEBUG(D_INFO, "next wakeup in "CFS_DURATION_T" ("
 353                        CFS_TIME_T")\n", time_to_next_wake,
 354                        cfs_time_add(this_ping,cfs_time_seconds(PING_INTERVAL)));
 355                 if (time_to_next_wake > 0) {
 356                         lwi = LWI_TIMEOUT(max_t(cfs_duration_t,
 357                                                 time_to_next_wake,
 358                                                 cfs_time_seconds(1)),
 359                                           NULL, NULL);
 360                         l_wait_event(thread->t_ctl_waitq,
 361                                      thread_is_stopping(thread) ||
 362                                      thread_is_event(thread),
 363                                      &lwi);
 364                         if (thread_test_and_clear_flags(thread, SVC_STOPPING)) {
 365                                 EXIT;
 366                                 break;
 367                         } else {
 368                                 /* woken after adding import to reset timer */
 369                                 thread_test_and_clear_flags(thread, SVC_EVENT);
 370                         }
 371                 }
 372         }
 373
 374         thread_set_flags(thread, SVC_STOPPED);
 375         cfs_waitq_signal(&thread->t_ctl_waitq);
 376
 377         CDEBUG(D_NET, "pinger thread exiting, process %d\n", cfs_curproc_pid());
 378         return 0;
 379 }
 380
 381 static struct ptlrpc_thread pinger_thread;
 382
 383 int ptlrpc_start_pinger(void)
 384 {
 385         struct l_wait_info lwi = { 0 };
 386         int rc;
 387 #ifndef ENABLE_PINGER
 388         return 0;
 389 #endif
 390         ENTRY;
 391
 392         if (!thread_is_init(&pinger_thread) &&
 393             !thread_is_stopped(&pinger_thread))
 394                 RETURN(-EALREADY);
 395
 396         cfs_waitq_init(&pinger_thread.t_ctl_waitq);
 397         cfs_waitq_init(&suspend_timeouts_waitq);
 398
 399         strcpy(pinger_thread.t_name, "ll_ping");
 400
 401         /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
 402          * just drop the VM and FILES in cfs_daemonize_ctxt() right away. */
 403         rc = cfs_create_thread(ptlrpc_pinger_main,
 404                                &pinger_thread, CFS_DAEMON_FLAGS);
 405         if (rc < 0) {
 406                 CERROR("cannot start thread: %d\n", rc);
 407                 RETURN(rc);
 408         }
 409         l_wait_event(pinger_thread.t_ctl_waitq,
 410                      thread_is_running(&pinger_thread), &lwi);
 411
 412         if (suppress_pings)
 413                 CWARN("Pings will be suppressed at the request of the "
 414                       "administrator.  The configuration shall meet the "
 415                       "additional requirements described in the manual.  "
 416                       "(Search for the \"suppress_pings\" kernel module "
 417                       "parameter.)\n");
 418
 419         RETURN(0);
 420 }
 421
 422 int ptlrpc_pinger_remove_timeouts(void);
 423
 424 int ptlrpc_stop_pinger(void)
 425 {
 426         struct l_wait_info lwi = { 0 };
 427 #ifndef ENABLE_PINGER
 428         return 0;
 429 #endif
 430         ENTRY;
 431
 432         if (thread_is_init(&pinger_thread) ||
 433             thread_is_stopped(&pinger_thread))
 434                 RETURN(-EALREADY);
 435
 436         ptlrpc_pinger_remove_timeouts();
 437
 438         thread_set_flags(&pinger_thread, SVC_STOPPING);
 439         cfs_waitq_signal(&pinger_thread.t_ctl_waitq);
 440
 441         l_wait_event(pinger_thread.t_ctl_waitq,
 442                      thread_is_stopped(&pinger_thread), &lwi);
 443         RETURN(0);
 444 }
 445
 446 void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
 447 {
 448         ptlrpc_update_next_ping(imp, 0);
 449 }
 450 EXPORT_SYMBOL(ptlrpc_pinger_sending_on_import);
 451
 452 void ptlrpc_pinger_commit_expected(struct obd_import *imp)
 453 {
 454         ptlrpc_update_next_ping(imp, 1);
 455         LASSERT_SPIN_LOCKED(&imp->imp_lock);
 456         /*
 457          * Avoid reading stale imp_connect_data.  When not sure if pings are
 458          * expected or not on next connection, we assume they are not and force
 459          * one anyway to guarantee the chance of updating
 460          * imp_peer_committed_transno.
 461          */
 462         if (imp->imp_state != LUSTRE_IMP_FULL ||
 463             OCD_HAS_FLAG(&imp->imp_connect_data, PINGLESS))
 464                 imp->imp_force_next_verify = 1;
 465 }
 466
 467 int ptlrpc_pinger_add_import(struct obd_import *imp)
 468 {
 469         ENTRY;
 470         if (!cfs_list_empty(&imp->imp_pinger_chain))
 471                 RETURN(-EALREADY);
 472
 473         mutex_lock(&pinger_mutex);
 474         CDEBUG(D_HA, "adding pingable import %s->%s\n",
 475                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 476         /* if we add to pinger we want recovery on this import */
 477         imp->imp_obd->obd_no_recov = 0;
 478         ptlrpc_update_next_ping(imp, 0);
 479         /* XXX sort, blah blah */
 480         cfs_list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
 481         class_import_get(imp);
 482
 483         ptlrpc_pinger_wake_up();
 484         mutex_unlock(&pinger_mutex);
 485
 486         RETURN(0);
 487 }
 488 EXPORT_SYMBOL(ptlrpc_pinger_add_import);
 489
 490 int ptlrpc_pinger_del_import(struct obd_import *imp)
 491 {
 492         ENTRY;
 493         if (cfs_list_empty(&imp->imp_pinger_chain))
 494                 RETURN(-ENOENT);
 495
 496         mutex_lock(&pinger_mutex);
 497         cfs_list_del_init(&imp->imp_pinger_chain);
 498         CDEBUG(D_HA, "removing pingable import %s->%s\n",
 499                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
 500         /* if we remove from pinger we don't want recovery on this import */
 501         imp->imp_obd->obd_no_recov = 1;
 502         class_import_put(imp);
 503         mutex_unlock(&pinger_mutex);
 504         RETURN(0);
 505 }
 506 EXPORT_SYMBOL(ptlrpc_pinger_del_import);
 507
 508 /**
 509  * Register a timeout callback to the pinger list, and the callback will
 510  * be called when timeout happens.
 511  */
 512 struct timeout_item* ptlrpc_new_timeout(int time, enum timeout_event event,
 513                                         timeout_cb_t cb, void *data)
 514 {
 515         struct timeout_item *ti;
 516
 517         OBD_ALLOC_PTR(ti);
 518         if (!ti)
 519                 return(NULL);
 520
 521         CFS_INIT_LIST_HEAD(&ti->ti_obd_list);
 522         CFS_INIT_LIST_HEAD(&ti->ti_chain);
 523         ti->ti_timeout = time;
 524         ti->ti_event = event;
 525         ti->ti_cb = cb;
 526         ti->ti_cb_data = data;
 527
 528         return ti;
 529 }
 530
 531 /**
 532  * Register timeout event on the the pinger thread.
 533  * Note: the timeout list is an sorted list with increased timeout value.
 534  */
 535 static struct timeout_item*
 536 ptlrpc_pinger_register_timeout(int time, enum timeout_event event,
 537                                timeout_cb_t cb, void *data)
 538 {
 539         struct timeout_item *item, *tmp;
 540
 541         LASSERT_MUTEX_LOCKED(&pinger_mutex);
 542
 543         cfs_list_for_each_entry(item, &timeout_list, ti_chain)
 544                 if (item->ti_event == event)
 545                         goto out;
 546
 547         item = ptlrpc_new_timeout(time, event, cb, data);
 548         if (item) {
 549                 cfs_list_for_each_entry_reverse(tmp, &timeout_list, ti_chain) {
 550                         if (tmp->ti_timeout < time) {
 551                                 cfs_list_add(&item->ti_chain, &tmp->ti_chain);
 552                                 goto out;
 553                         }
 554                 }
 555                 cfs_list_add(&item->ti_chain, &timeout_list);
 556         }
 557 out:
 558         return item;
 559 }
 560
 561 /* Add a client_obd to the timeout event list, when timeout(@time)
 562  * happens, the callback(@cb) will be called.
 563  */
 564 int ptlrpc_add_timeout_client(int time, enum timeout_event event,
 565                               timeout_cb_t cb, void *data,
 566                               cfs_list_t *obd_list)
 567 {
 568         struct timeout_item *ti;
 569
 570         mutex_lock(&pinger_mutex);
 571         ti = ptlrpc_pinger_register_timeout(time, event, cb, data);
 572         if (!ti) {
 573                 mutex_unlock(&pinger_mutex);
 574                 return (-EINVAL);
 575         }
 576         cfs_list_add(obd_list, &ti->ti_obd_list);
 577         mutex_unlock(&pinger_mutex);
 578         return 0;
 579 }
 580 EXPORT_SYMBOL(ptlrpc_add_timeout_client);
 581
 582 int ptlrpc_del_timeout_client(cfs_list_t *obd_list,
 583                               enum timeout_event event)
 584 {
 585         struct timeout_item *ti = NULL, *item;
 586
 587         if (cfs_list_empty(obd_list))
 588                 return 0;
 589         mutex_lock(&pinger_mutex);
 590         cfs_list_del_init(obd_list);
 591         /**
 592          * If there are no obd attached to the timeout event
 593          * list, remove this timeout event from the pinger
 594          */
 595         cfs_list_for_each_entry(item, &timeout_list, ti_chain) {
 596                 if (item->ti_event == event) {
 597                         ti = item;
 598                         break;
 599                 }
 600         }
 601         LASSERTF(ti != NULL, "ti is NULL ! \n");
 602         if (cfs_list_empty(&ti->ti_obd_list)) {
 603                 cfs_list_del(&ti->ti_chain);
 604                 OBD_FREE_PTR(ti);
 605         }
 606         mutex_unlock(&pinger_mutex);
 607         return 0;
 608 }
 609 EXPORT_SYMBOL(ptlrpc_del_timeout_client);
 610
 611 int ptlrpc_pinger_remove_timeouts(void)
 612 {
 613         struct timeout_item *item, *tmp;
 614
 615         mutex_lock(&pinger_mutex);
 616         cfs_list_for_each_entry_safe(item, tmp, &timeout_list, ti_chain) {
 617                 LASSERT(cfs_list_empty(&item->ti_obd_list));
 618                 cfs_list_del(&item->ti_chain);
 619                 OBD_FREE_PTR(item);
 620         }
 621         mutex_unlock(&pinger_mutex);
 622         return 0;
 623 }
 624
 625 void ptlrpc_pinger_wake_up()
 626 {
 627 #ifdef ENABLE_PINGER
 628         thread_add_flags(&pinger_thread, SVC_EVENT);
 629         cfs_waitq_signal(&pinger_thread.t_ctl_waitq);
 630 #endif
 631 }
 632
 633 /* Ping evictor thread */
 634 #define PET_READY     1
 635 #define PET_TERMINATE 2
 636
 637 static int               pet_refcount = 0;
 638 static int               pet_state;
 639 static cfs_waitq_t       pet_waitq;
 640 CFS_LIST_HEAD(pet_list);
 641 static DEFINE_SPINLOCK(pet_lock);
 642
 643 int ping_evictor_wake(struct obd_export *exp)
 644 {
 645         struct obd_device *obd;
 646
 647         spin_lock(&pet_lock);
 648         if (pet_state != PET_READY) {
 649                 /* eventually the new obd will call here again. */
 650                 spin_unlock(&pet_lock);
 651                 return 1;
 652         }
 653
 654         obd = class_exp2obd(exp);
 655         if (cfs_list_empty(&obd->obd_evict_list)) {
 656                 class_incref(obd, "evictor", obd);
 657                 cfs_list_add(&obd->obd_evict_list, &pet_list);
 658         }
 659         spin_unlock(&pet_lock);
 660
 661         cfs_waitq_signal(&pet_waitq);
 662         return 0;
 663 }
 664
 665 static int ping_evictor_main(void *arg)
 666 {
 667         struct obd_device *obd;
 668         struct obd_export *exp;
 669         struct l_wait_info lwi = { 0 };
 670         time_t expire_time;
 671         ENTRY;
 672
 673         cfs_daemonize_ctxt("ll_evictor");
 674
 675         CDEBUG(D_HA, "Starting Ping Evictor\n");
 676         pet_state = PET_READY;
 677         while (1) {
 678                 l_wait_event(pet_waitq, (!cfs_list_empty(&pet_list)) ||
 679                              (pet_state == PET_TERMINATE), &lwi);
 680
 681                 /* loop until all obd's will be removed */
 682                 if ((pet_state == PET_TERMINATE) && cfs_list_empty(&pet_list))
 683                         break;
 684
 685                 /* we only get here if pet_exp != NULL, and the end of this
 686                  * loop is the only place which sets it NULL again, so lock
 687                  * is not strictly necessary. */
 688                 spin_lock(&pet_lock);
 689                 obd = cfs_list_entry(pet_list.next, struct obd_device,
 690                                      obd_evict_list);
 691                 spin_unlock(&pet_lock);
 692
 693                 expire_time = cfs_time_current_sec() - PING_EVICT_TIMEOUT;
 694
 695                 CDEBUG(D_HA, "evicting all exports of obd %s older than %ld\n",
 696                        obd->obd_name, expire_time);
 697
 698                 /* Exports can't be deleted out of the list while we hold
 699                  * the obd lock (class_unlink_export), which means we can't
 700                  * lose the last ref on the export.  If they've already been
 701                  * removed from the list, we won't find them here. */
 702                 spin_lock(&obd->obd_dev_lock);
 703                 while (!cfs_list_empty(&obd->obd_exports_timed)) {
 704                         exp = cfs_list_entry(obd->obd_exports_timed.next,
 705                                              struct obd_export,
 706                                              exp_obd_chain_timed);
 707                         if (expire_time > exp->exp_last_request_time) {
 708                                 class_export_get(exp);
 709                                 spin_unlock(&obd->obd_dev_lock);
 710                                 LCONSOLE_WARN("%s: haven't heard from client %s"
 711                                               " (at %s) in %ld seconds. I think"
 712                                               " it's dead, and I am evicting"
 713                                               " it. exp %p, cur %ld expire %ld"
 714                                               " last %ld\n",
 715                                               obd->obd_name,
 716                                               obd_uuid2str(&exp->exp_client_uuid),
 717                                               obd_export_nid2str(exp),
 718                                               (long)(cfs_time_current_sec() -
 719                                                      exp->exp_last_request_time),
 720                                               exp, (long)cfs_time_current_sec(),
 721                                               (long)expire_time,
 722                                               (long)exp->exp_last_request_time);
 723                                 CDEBUG(D_HA, "Last request was at %ld\n",
 724                                        exp->exp_last_request_time);
 725                                 class_fail_export(exp);
 726                                 class_export_put(exp);
 727                                 spin_lock(&obd->obd_dev_lock);
 728                         } else {
 729                                 /* List is sorted, so everyone below is ok */
 730                                 break;
 731                         }
 732                 }
 733                 spin_unlock(&obd->obd_dev_lock);
 734
 735                 spin_lock(&pet_lock);
 736                 cfs_list_del_init(&obd->obd_evict_list);
 737                 spin_unlock(&pet_lock);
 738
 739                 class_decref(obd, "evictor", obd);
 740         }
 741         CDEBUG(D_HA, "Exiting Ping Evictor\n");
 742
 743         RETURN(0);
 744 }
 745
 746 void ping_evictor_start(void)
 747 {
 748         int rc;
 749
 750         if (++pet_refcount > 1)
 751                 return;
 752
 753         cfs_waitq_init(&pet_waitq);
 754
 755         rc = cfs_create_thread(ping_evictor_main, NULL, CFS_DAEMON_FLAGS);
 756         if (rc < 0) {
 757                 pet_refcount--;
 758                 CERROR("Cannot start ping evictor thread: %d\n", rc);
 759         }
 760 }
 761 EXPORT_SYMBOL(ping_evictor_start);
 762
 763 void ping_evictor_stop(void)
 764 {
 765         if (--pet_refcount > 0)
 766                 return;
 767
 768         pet_state = PET_TERMINATE;
 769         cfs_waitq_signal(&pet_waitq);
 770 }
 771 EXPORT_SYMBOL(ping_evictor_stop);
 772 #else /* !__KERNEL__ */
 773
 774 /* XXX
 775  * the current implementation of pinger in liblustre is not optimized
 776  */
 777
 778 #ifdef ENABLE_PINGER
 779 static struct pinger_data {
 780         int             pd_recursion;
 781         cfs_time_t      pd_this_ping;   /* jiffies */
 782         cfs_time_t      pd_next_ping;   /* jiffies */
 783         struct ptlrpc_request_set *pd_set;
 784 } pinger_args;
 785
 786 static int pinger_check_rpcs(void *arg)
 787 {
 788         cfs_time_t curtime = cfs_time_current();
 789         struct ptlrpc_request *req;
 790         struct ptlrpc_request_set *set;
 791         cfs_list_t *iter;
 792         struct obd_import *imp;
 793         struct pinger_data *pd = &pinger_args;
 794         int rc;
 795
 796         /* prevent recursion */
 797         if (pd->pd_recursion++) {
 798                 CDEBUG(D_HA, "pinger: recursion! quit\n");
 799                 LASSERT(pd->pd_set);
 800                 pd->pd_recursion--;
 801                 return 0;
 802         }
 803
 804         /* have we reached ping point? */
 805         if (!pd->pd_set && cfs_time_before(curtime, pd->pd_next_ping)) {
 806                 pd->pd_recursion--;
 807                 return 0;
 808         }
 809
 810         /* if we have rpc_set already, continue processing it */
 811         if (pd->pd_set) {
 812                 LASSERT(pd->pd_this_ping);
 813                 set = pd->pd_set;
 814                 goto do_check_set;
 815         }
 816
 817         pd->pd_this_ping = curtime;
 818         pd->pd_set = ptlrpc_prep_set();
 819         if (pd->pd_set == NULL)
 820                 goto out;
 821         set = pd->pd_set;
 822
 823         /* add rpcs into set */
 824         mutex_lock(&pinger_mutex);
 825         cfs_list_for_each(iter, &pinger_imports) {
 826                 struct obd_import *imp = cfs_list_entry(iter, struct obd_import,
 827                                                         imp_pinger_chain);
 828                 int generation, level;
 829
 830                 if (cfs_time_aftereq(pd->pd_this_ping,
 831                                      imp->imp_next_ping - 5 * CFS_TICK)) {
 832                         /* Add a ping. */
 833                         spin_lock(&imp->imp_lock);
 834                         generation = imp->imp_generation;
 835                         level = imp->imp_state;
 836                         spin_unlock(&imp->imp_lock);
 837
 838                         if (level != LUSTRE_IMP_FULL) {
 839                                 CDEBUG(D_HA,
 840                                        "not pinging %s (in recovery)\n",
 841                                        obd2cli_tgt(imp->imp_obd));
 842                                 continue;
 843                         }
 844
 845                         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING,
 846                                                         LUSTRE_OBD_VERSION,
 847                                                         OBD_PING);
 848                         if (req == NULL) {
 849                                 CERROR("OOM trying to ping %s->%s\n",
 850                                        imp->imp_obd->obd_uuid.uuid,
 851                                        obd2cli_tgt(imp->imp_obd));
 852                                 break;
 853                         }
 854
 855                         req->rq_no_resend = 1;
 856                         ptlrpc_request_set_replen(req);
 857                         req->rq_send_state = LUSTRE_IMP_FULL;
 858                         ptlrpc_rqphase_move(req, RQ_PHASE_RPC);
 859                         req->rq_import_generation = generation;
 860                         ptlrpc_set_add_req(set, req);
 861                 } else {
 862                         CDEBUG(D_INFO, "don't need to ping %s ("CFS_TIME_T
 863                                " > "CFS_TIME_T")\n", obd2cli_tgt(imp->imp_obd),
 864                                imp->imp_next_ping, pd->pd_this_ping);
 865                 }
 866         }
 867         pd->pd_this_ping = curtime;
 868         mutex_unlock(&pinger_mutex);
 869
 870         /* Might be empty, that's OK. */
 871         if (cfs_atomic_read(&set->set_remaining) == 0)
 872                 CDEBUG(D_RPCTRACE, "nothing to ping\n");
 873
 874         cfs_list_for_each(iter, &set->set_requests) {
 875                 struct ptlrpc_request *req =
 876                         cfs_list_entry(iter, struct ptlrpc_request,
 877                                        rq_set_chain);
 878                 DEBUG_REQ(D_RPCTRACE, req, "pinging %s->%s",
 879                           req->rq_import->imp_obd->obd_uuid.uuid,
 880                           obd2cli_tgt(req->rq_import->imp_obd));
 881                 (void)ptl_send_rpc(req, 0);
 882         }
 883
 884 do_check_set:
 885         rc = ptlrpc_check_set(NULL, set);
 886
 887         /* not finished, and we are not expired, simply return */
 888         if (!rc && cfs_time_before(curtime, cfs_time_add(pd->pd_this_ping,
 889                                             cfs_time_seconds(PING_INTERVAL)))) {
 890                 CDEBUG(D_RPCTRACE, "not finished, but also not expired\n");
 891                 pd->pd_recursion--;
 892                 return 0;
 893         }
 894
 895         /* Expire all the requests that didn't come back. */
 896         mutex_lock(&pinger_mutex);
 897         cfs_list_for_each(iter, &set->set_requests) {
 898                 req = cfs_list_entry(iter, struct ptlrpc_request,
 899                                      rq_set_chain);
 900
 901                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 902                         continue;
 903
 904                 CDEBUG(D_RPCTRACE, "Pinger initiate expire request(%p)\n",
 905                        req);
 906
 907                 /* This will also unregister reply. */
 908                 ptlrpc_expire_one_request(req, 0);
 909
 910                 /* We're done with this req, let's finally move it to complete
 911                  * phase and take care of inflights. */
 912                 ptlrpc_rqphase_move(req, RQ_PHASE_COMPLETE);
 913                 imp = req->rq_import;
 914                 spin_lock(&imp->imp_lock);
 915                 if (!cfs_list_empty(&req->rq_list)) {
 916                         cfs_list_del_init(&req->rq_list);
 917                         cfs_atomic_dec(&imp->imp_inflight);
 918                 }
 919                 spin_unlock(&imp->imp_lock);
 920                 cfs_atomic_dec(&set->set_remaining);
 921         }
 922         mutex_unlock(&pinger_mutex);
 923
 924         ptlrpc_set_destroy(set);
 925         pd->pd_set = NULL;
 926
 927 out:
 928         pd->pd_next_ping = cfs_time_add(pd->pd_this_ping,
 929                                         cfs_time_seconds(PING_INTERVAL));
 930         pd->pd_this_ping = 0; /* XXX for debug */
 931
 932         CDEBUG(D_INFO, "finished a round ping\n");
 933         pd->pd_recursion--;
 934         return 0;
 935 }
 936
 937 static void *pinger_callback = NULL;
 938 #endif /* ENABLE_PINGER */
 939
 940 int ptlrpc_start_pinger(void)
 941 {
 942 #ifdef ENABLE_PINGER
 943         memset(&pinger_args, 0, sizeof(pinger_args));
 944         pinger_callback = liblustre_register_wait_callback("pinger_check_rpcs",
 945                                                            &pinger_check_rpcs,
 946                                                            &pinger_args);
 947 #endif
 948         return 0;
 949 }
 950
 951 int ptlrpc_stop_pinger(void)
 952 {
 953 #ifdef ENABLE_PINGER
 954         if (pinger_callback)
 955                 liblustre_deregister_wait_callback(pinger_callback);
 956 #endif
 957         return 0;
 958 }
 959
 960 void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
 961 {
 962 #ifdef ENABLE_PINGER
 963         mutex_lock(&pinger_mutex);
 964         ptlrpc_update_next_ping(imp, 0);
 965         if (pinger_args.pd_set == NULL &&
 966             cfs_time_before(imp->imp_next_ping, pinger_args.pd_next_ping)) {
 967                 CDEBUG(D_HA, "set next ping to "CFS_TIME_T"(cur "CFS_TIME_T")\n",
 968                         imp->imp_next_ping, cfs_time_current());
 969                 pinger_args.pd_next_ping = imp->imp_next_ping;
 970         }
 971         mutex_unlock(&pinger_mutex);
 972 #endif
 973 }
 974
 975 void ptlrpc_pinger_commit_expected(struct obd_import *imp)
 976 {
 977 #ifdef ENABLE_PINGER
 978         mutex_lock(&pinger_mutex);
 979         ptlrpc_update_next_ping(imp, 1);
 980         if (pinger_args.pd_set == NULL &&
 981             cfs_time_before(imp->imp_next_ping, pinger_args.pd_next_ping)) {
 982                 CDEBUG(D_HA,"set next ping to "CFS_TIME_T"(cur "CFS_TIME_T")\n",
 983                         imp->imp_next_ping, cfs_time_current());
 984                 pinger_args.pd_next_ping = imp->imp_next_ping;
 985         }
 986         mutex_unlock(&pinger_mutex);
 987 #endif
 988 }
 989
 990 int ptlrpc_add_timeout_client(int time, enum timeout_event event,
 991                               timeout_cb_t cb, void *data,
 992                               cfs_list_t *obd_list)
 993 {
 994         return 0;
 995 }
 996
 997 int ptlrpc_del_timeout_client(cfs_list_t *obd_list,
 998                               enum timeout_event event)
 999 {
1000         return 0;
1001 }
1002
1003 int ptlrpc_pinger_add_import(struct obd_import *imp)
1004 {
1005         ENTRY;
1006         if (!cfs_list_empty(&imp->imp_pinger_chain))
1007                 RETURN(-EALREADY);
1008
1009         CDEBUG(D_HA, "adding pingable import %s->%s\n",
1010                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
1011         ptlrpc_pinger_sending_on_import(imp);
1012
1013         mutex_lock(&pinger_mutex);
1014         cfs_list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
1015         class_import_get(imp);
1016         mutex_unlock(&pinger_mutex);
1017
1018         RETURN(0);
1019 }
1020
1021 int ptlrpc_pinger_del_import(struct obd_import *imp)
1022 {
1023         ENTRY;
1024         if (cfs_list_empty(&imp->imp_pinger_chain))
1025                 RETURN(-ENOENT);
1026
1027         mutex_lock(&pinger_mutex);
1028         cfs_list_del_init(&imp->imp_pinger_chain);
1029         CDEBUG(D_HA, "removing pingable import %s->%s\n",
1030                imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
1031         class_import_put(imp);
1032         mutex_unlock(&pinger_mutex);
1033         RETURN(0);
1034 }
1035
1036 void ptlrpc_pinger_wake_up()
1037 {
1038 #ifdef ENABLE_PINGER
1039         /* XXX force pinger to run, if needed */
1040         struct obd_import *imp;
1041         ENTRY;
1042         cfs_list_for_each_entry(imp, &pinger_imports, imp_pinger_chain) {
1043                 CDEBUG(D_RPCTRACE, "checking import %s->%s\n",
1044                        imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
1045 #ifdef ENABLE_LIBLUSTRE_RECOVERY
1046                 if (imp->imp_state == LUSTRE_IMP_DISCON &&
1047                     !imp_is_deactive(imp))
1048 #else
1049                 /*XXX only recover for the initial connection */
1050                 if (!lustre_handle_is_used(&imp->imp_remote_handle) &&
1051                     imp->imp_state == LUSTRE_IMP_DISCON &&
1052                     !imp_is_deactive(imp))
1053 #endif
1054                         ptlrpc_initiate_recovery(imp);
1055                 else if (imp->imp_state != LUSTRE_IMP_FULL)
1056                         CDEBUG(D_HA, "Refused to recover import %s->%s "
1057                                      "state %d, deactive %d\n",
1058                                      imp->imp_obd->obd_uuid.uuid,
1059                                      obd2cli_tgt(imp->imp_obd), imp->imp_state,
1060                                      imp_is_deactive(imp));
1061         }
1062         EXIT;
1063 #endif
1064 }
1065 #endif /* !__KERNEL__ */