4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
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
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ptlrpc/pinger.c
38 * Portal-RPC reconnection and replay operations, for use in recovery.
41 #define DEBUG_SUBSYSTEM S_RPC
43 #include "../include/obd_support.h"
44 #include "../include/obd_class.h"
45 #include "ptlrpc_internal.h"
47 static int suppress_pings;
48 module_param(suppress_pings, int, 0644);
49 MODULE_PARM_DESC(suppress_pings, "Suppress pings");
51 struct mutex pinger_mutex;
52 static LIST_HEAD(pinger_imports);
53 static struct list_head timeout_list = LIST_HEAD_INIT(timeout_list);
55 int ptlrpc_pinger_suppress_pings(void)
57 return suppress_pings;
59 EXPORT_SYMBOL(ptlrpc_pinger_suppress_pings);
61 struct ptlrpc_request *
62 ptlrpc_prep_ping(struct obd_import *imp)
64 struct ptlrpc_request *req;
66 req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING,
67 LUSTRE_OBD_VERSION, OBD_PING);
69 ptlrpc_request_set_replen(req);
70 req->rq_no_resend = req->rq_no_delay = 1;
75 int ptlrpc_obd_ping(struct obd_device *obd)
78 struct ptlrpc_request *req;
80 req = ptlrpc_prep_ping(obd->u.cli.cl_import);
84 req->rq_send_state = LUSTRE_IMP_FULL;
86 rc = ptlrpc_queue_wait(req);
88 ptlrpc_req_finished(req);
92 EXPORT_SYMBOL(ptlrpc_obd_ping);
94 static int ptlrpc_ping(struct obd_import *imp)
96 struct ptlrpc_request *req;
98 req = ptlrpc_prep_ping(imp);
100 CERROR("OOM trying to ping %s->%s\n",
101 imp->imp_obd->obd_uuid.uuid,
102 obd2cli_tgt(imp->imp_obd));
106 DEBUG_REQ(D_INFO, req, "pinging %s->%s",
107 imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
108 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
113 static void ptlrpc_update_next_ping(struct obd_import *imp, int soon)
115 int time = soon ? PING_INTERVAL_SHORT : PING_INTERVAL;
116 if (imp->imp_state == LUSTRE_IMP_DISCON) {
117 int dtime = max_t(int, CONNECTION_SWITCH_MIN,
119 at_get(&imp->imp_at.iat_net_latency));
120 time = min(time, dtime);
122 imp->imp_next_ping = cfs_time_shift(time);
125 void ptlrpc_ping_import_soon(struct obd_import *imp)
127 imp->imp_next_ping = cfs_time_current();
130 static inline int imp_is_deactive(struct obd_import *imp)
132 return (imp->imp_deactive ||
133 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_IMP_DEACTIVE));
136 static inline int ptlrpc_next_reconnect(struct obd_import *imp)
138 if (imp->imp_server_timeout)
139 return cfs_time_shift(obd_timeout / 2);
141 return cfs_time_shift(obd_timeout);
144 static long pinger_check_timeout(unsigned long time)
146 struct timeout_item *item;
147 unsigned long timeout = PING_INTERVAL;
149 /* The timeout list is a increase order sorted list */
150 mutex_lock(&pinger_mutex);
151 list_for_each_entry(item, &timeout_list, ti_chain) {
152 int ti_timeout = item->ti_timeout;
153 if (timeout > ti_timeout)
154 timeout = ti_timeout;
157 mutex_unlock(&pinger_mutex);
159 return cfs_time_sub(cfs_time_add(time, cfs_time_seconds(timeout)),
165 void ptlrpc_pinger_ir_up(void)
167 CDEBUG(D_HA, "IR up\n");
170 EXPORT_SYMBOL(ptlrpc_pinger_ir_up);
172 void ptlrpc_pinger_ir_down(void)
174 CDEBUG(D_HA, "IR down\n");
177 EXPORT_SYMBOL(ptlrpc_pinger_ir_down);
179 static void ptlrpc_pinger_process_import(struct obd_import *imp,
180 unsigned long this_ping)
187 spin_lock(&imp->imp_lock);
189 level = imp->imp_state;
190 force = imp->imp_force_verify;
191 force_next = imp->imp_force_next_verify;
193 * This will be used below only if the import is "FULL".
195 suppress = ir_up && OCD_HAS_FLAG(&imp->imp_connect_data, PINGLESS);
197 imp->imp_force_verify = 0;
199 if (cfs_time_aftereq(imp->imp_next_ping - 5 * CFS_TICK, this_ping) &&
201 spin_unlock(&imp->imp_lock);
205 imp->imp_force_next_verify = 0;
207 spin_unlock(&imp->imp_lock);
209 CDEBUG(level == LUSTRE_IMP_FULL ? D_INFO : D_HA, "%s->%s: level %s/%u force %u force_next %u deactive %u pingable %u suppress %u\n",
210 imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd),
211 ptlrpc_import_state_name(level), level, force, force_next,
212 imp->imp_deactive, imp->imp_pingable, suppress);
214 if (level == LUSTRE_IMP_DISCON && !imp_is_deactive(imp)) {
215 /* wait for a while before trying recovery again */
216 imp->imp_next_ping = ptlrpc_next_reconnect(imp);
217 if (!imp->imp_no_pinger_recover)
218 ptlrpc_initiate_recovery(imp);
219 } else if (level != LUSTRE_IMP_FULL ||
220 imp->imp_obd->obd_no_recov ||
221 imp_is_deactive(imp)) {
222 CDEBUG(D_HA, "%s->%s: not pinging (in recovery or recovery disabled: %s)\n",
223 imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd),
224 ptlrpc_import_state_name(level));
226 spin_lock(&imp->imp_lock);
227 imp->imp_force_verify = 1;
228 spin_unlock(&imp->imp_lock);
230 } else if ((imp->imp_pingable && !suppress) || force_next || force) {
235 static int ptlrpc_pinger_main(void *arg)
237 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
239 /* Record that the thread is running */
240 thread_set_flags(thread, SVC_RUNNING);
241 wake_up(&thread->t_ctl_waitq);
243 /* And now, loop forever, pinging as needed. */
245 unsigned long this_ping = cfs_time_current();
246 struct l_wait_info lwi;
247 long time_to_next_wake;
248 struct timeout_item *item;
249 struct list_head *iter;
251 mutex_lock(&pinger_mutex);
252 list_for_each_entry(item, &timeout_list, ti_chain) {
253 item->ti_cb(item, item->ti_cb_data);
255 list_for_each(iter, &pinger_imports) {
256 struct obd_import *imp =
257 list_entry(iter, struct obd_import,
260 ptlrpc_pinger_process_import(imp, this_ping);
261 /* obd_timeout might have changed */
262 if (imp->imp_pingable && imp->imp_next_ping &&
263 cfs_time_after(imp->imp_next_ping,
264 cfs_time_add(this_ping,
265 cfs_time_seconds(PING_INTERVAL))))
266 ptlrpc_update_next_ping(imp, 0);
268 mutex_unlock(&pinger_mutex);
269 /* update memory usage info */
270 obd_update_maxusage();
272 /* Wait until the next ping time, or until we're stopped. */
273 time_to_next_wake = pinger_check_timeout(this_ping);
274 /* The ping sent by ptlrpc_send_rpc may get sent out
275 say .01 second after this.
276 ptlrpc_pinger_sending_on_import will then set the
277 next ping time to next_ping + .01 sec, which means
278 we will SKIP the next ping at next_ping, and the
279 ping will get sent 2 timeouts from now! Beware. */
280 CDEBUG(D_INFO, "next wakeup in "CFS_DURATION_T" ("
281 CFS_TIME_T")\n", time_to_next_wake,
282 cfs_time_add(this_ping,
283 cfs_time_seconds(PING_INTERVAL)));
284 if (time_to_next_wake > 0) {
285 lwi = LWI_TIMEOUT(max_t(long, time_to_next_wake,
286 cfs_time_seconds(1)),
288 l_wait_event(thread->t_ctl_waitq,
289 thread_is_stopping(thread) ||
290 thread_is_event(thread),
292 if (thread_test_and_clear_flags(thread, SVC_STOPPING))
294 /* woken after adding import to reset timer */
295 thread_test_and_clear_flags(thread, SVC_EVENT);
299 thread_set_flags(thread, SVC_STOPPED);
300 wake_up(&thread->t_ctl_waitq);
302 CDEBUG(D_NET, "pinger thread exiting, process %d\n", current_pid());
306 static struct ptlrpc_thread pinger_thread;
308 int ptlrpc_start_pinger(void)
310 struct l_wait_info lwi = { 0 };
313 if (!thread_is_init(&pinger_thread) &&
314 !thread_is_stopped(&pinger_thread))
317 init_waitqueue_head(&pinger_thread.t_ctl_waitq);
319 strcpy(pinger_thread.t_name, "ll_ping");
321 rc = PTR_ERR(kthread_run(ptlrpc_pinger_main, &pinger_thread,
322 "%s", pinger_thread.t_name));
323 if (IS_ERR_VALUE(rc)) {
324 CERROR("cannot start thread: %d\n", rc);
327 l_wait_event(pinger_thread.t_ctl_waitq,
328 thread_is_running(&pinger_thread), &lwi);
331 CWARN("Pings will be suppressed at the request of the administrator. The configuration shall meet the additional requirements described in the manual. (Search for the \"suppress_pings\" kernel module parameter.)\n");
336 int ptlrpc_pinger_remove_timeouts(void);
338 int ptlrpc_stop_pinger(void)
340 struct l_wait_info lwi = { 0 };
343 if (thread_is_init(&pinger_thread) ||
344 thread_is_stopped(&pinger_thread))
347 ptlrpc_pinger_remove_timeouts();
348 thread_set_flags(&pinger_thread, SVC_STOPPING);
349 wake_up(&pinger_thread.t_ctl_waitq);
351 l_wait_event(pinger_thread.t_ctl_waitq,
352 thread_is_stopped(&pinger_thread), &lwi);
357 void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
359 ptlrpc_update_next_ping(imp, 0);
361 EXPORT_SYMBOL(ptlrpc_pinger_sending_on_import);
363 void ptlrpc_pinger_commit_expected(struct obd_import *imp)
365 ptlrpc_update_next_ping(imp, 1);
366 assert_spin_locked(&imp->imp_lock);
368 * Avoid reading stale imp_connect_data. When not sure if pings are
369 * expected or not on next connection, we assume they are not and force
370 * one anyway to guarantee the chance of updating
371 * imp_peer_committed_transno.
373 if (imp->imp_state != LUSTRE_IMP_FULL ||
374 OCD_HAS_FLAG(&imp->imp_connect_data, PINGLESS))
375 imp->imp_force_next_verify = 1;
378 int ptlrpc_pinger_add_import(struct obd_import *imp)
380 if (!list_empty(&imp->imp_pinger_chain))
383 mutex_lock(&pinger_mutex);
384 CDEBUG(D_HA, "adding pingable import %s->%s\n",
385 imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
386 /* if we add to pinger we want recovery on this import */
387 imp->imp_obd->obd_no_recov = 0;
388 ptlrpc_update_next_ping(imp, 0);
389 /* XXX sort, blah blah */
390 list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
391 class_import_get(imp);
393 ptlrpc_pinger_wake_up();
394 mutex_unlock(&pinger_mutex);
398 EXPORT_SYMBOL(ptlrpc_pinger_add_import);
400 int ptlrpc_pinger_del_import(struct obd_import *imp)
402 if (list_empty(&imp->imp_pinger_chain))
405 mutex_lock(&pinger_mutex);
406 list_del_init(&imp->imp_pinger_chain);
407 CDEBUG(D_HA, "removing pingable import %s->%s\n",
408 imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
409 /* if we remove from pinger we don't want recovery on this import */
410 imp->imp_obd->obd_no_recov = 1;
411 class_import_put(imp);
412 mutex_unlock(&pinger_mutex);
415 EXPORT_SYMBOL(ptlrpc_pinger_del_import);
418 * Register a timeout callback to the pinger list, and the callback will
419 * be called when timeout happens.
421 static struct timeout_item *ptlrpc_new_timeout(int time,
422 enum timeout_event event, timeout_cb_t cb, void *data)
424 struct timeout_item *ti;
426 ti = kzalloc(sizeof(*ti), GFP_NOFS);
430 INIT_LIST_HEAD(&ti->ti_obd_list);
431 INIT_LIST_HEAD(&ti->ti_chain);
432 ti->ti_timeout = time;
433 ti->ti_event = event;
435 ti->ti_cb_data = data;
441 * Register timeout event on the pinger thread.
442 * Note: the timeout list is an sorted list with increased timeout value.
444 static struct timeout_item*
445 ptlrpc_pinger_register_timeout(int time, enum timeout_event event,
446 timeout_cb_t cb, void *data)
448 struct timeout_item *item, *tmp;
450 LASSERT(mutex_is_locked(&pinger_mutex));
452 list_for_each_entry(item, &timeout_list, ti_chain)
453 if (item->ti_event == event)
456 item = ptlrpc_new_timeout(time, event, cb, data);
458 list_for_each_entry_reverse(tmp, &timeout_list, ti_chain) {
459 if (tmp->ti_timeout < time) {
460 list_add(&item->ti_chain, &tmp->ti_chain);
464 list_add(&item->ti_chain, &timeout_list);
470 /* Add a client_obd to the timeout event list, when timeout(@time)
471 * happens, the callback(@cb) will be called.
473 int ptlrpc_add_timeout_client(int time, enum timeout_event event,
474 timeout_cb_t cb, void *data,
475 struct list_head *obd_list)
477 struct timeout_item *ti;
479 mutex_lock(&pinger_mutex);
480 ti = ptlrpc_pinger_register_timeout(time, event, cb, data);
482 mutex_unlock(&pinger_mutex);
485 list_add(obd_list, &ti->ti_obd_list);
486 mutex_unlock(&pinger_mutex);
489 EXPORT_SYMBOL(ptlrpc_add_timeout_client);
491 int ptlrpc_del_timeout_client(struct list_head *obd_list,
492 enum timeout_event event)
494 struct timeout_item *ti = NULL, *item;
496 if (list_empty(obd_list))
498 mutex_lock(&pinger_mutex);
499 list_del_init(obd_list);
501 * If there are no obd attached to the timeout event
502 * list, remove this timeout event from the pinger
504 list_for_each_entry(item, &timeout_list, ti_chain) {
505 if (item->ti_event == event) {
510 LASSERTF(ti != NULL, "ti is NULL !\n");
511 if (list_empty(&ti->ti_obd_list)) {
512 list_del(&ti->ti_chain);
515 mutex_unlock(&pinger_mutex);
518 EXPORT_SYMBOL(ptlrpc_del_timeout_client);
520 int ptlrpc_pinger_remove_timeouts(void)
522 struct timeout_item *item, *tmp;
524 mutex_lock(&pinger_mutex);
525 list_for_each_entry_safe(item, tmp, &timeout_list, ti_chain) {
526 LASSERT(list_empty(&item->ti_obd_list));
527 list_del(&item->ti_chain);
530 mutex_unlock(&pinger_mutex);
534 void ptlrpc_pinger_wake_up(void)
536 thread_add_flags(&pinger_thread, SVC_EVENT);
537 wake_up(&pinger_thread.t_ctl_waitq);
540 /* Ping evictor thread */
542 #define PET_TERMINATE 2
544 static int pet_refcount;
545 static int pet_state;
546 static wait_queue_head_t pet_waitq;
547 static LIST_HEAD(pet_list);
548 static DEFINE_SPINLOCK(pet_lock);
550 int ping_evictor_wake(struct obd_export *exp)
552 struct obd_device *obd;
554 spin_lock(&pet_lock);
555 if (pet_state != PET_READY) {
556 /* eventually the new obd will call here again. */
557 spin_unlock(&pet_lock);
561 obd = class_exp2obd(exp);
562 if (list_empty(&obd->obd_evict_list)) {
563 class_incref(obd, "evictor", obd);
564 list_add(&obd->obd_evict_list, &pet_list);
566 spin_unlock(&pet_lock);
572 static int ping_evictor_main(void *arg)
574 struct obd_device *obd;
575 struct obd_export *exp;
576 struct l_wait_info lwi = { 0 };
581 CDEBUG(D_HA, "Starting Ping Evictor\n");
582 pet_state = PET_READY;
584 l_wait_event(pet_waitq, (!list_empty(&pet_list)) ||
585 (pet_state == PET_TERMINATE), &lwi);
587 /* loop until all obd's will be removed */
588 if ((pet_state == PET_TERMINATE) && list_empty(&pet_list))
591 /* we only get here if pet_exp != NULL, and the end of this
592 * loop is the only place which sets it NULL again, so lock
593 * is not strictly necessary. */
594 spin_lock(&pet_lock);
595 obd = list_entry(pet_list.next, struct obd_device,
597 spin_unlock(&pet_lock);
599 expire_time = get_seconds() - PING_EVICT_TIMEOUT;
601 CDEBUG(D_HA, "evicting all exports of obd %s older than %ld\n",
602 obd->obd_name, expire_time);
604 /* Exports can't be deleted out of the list while we hold
605 * the obd lock (class_unlink_export), which means we can't
606 * lose the last ref on the export. If they've already been
607 * removed from the list, we won't find them here. */
608 spin_lock(&obd->obd_dev_lock);
609 while (!list_empty(&obd->obd_exports_timed)) {
610 exp = list_entry(obd->obd_exports_timed.next,
612 exp_obd_chain_timed);
613 if (expire_time > exp->exp_last_request_time) {
614 class_export_get(exp);
615 spin_unlock(&obd->obd_dev_lock);
616 LCONSOLE_WARN("%s: haven't heard from client %s (at %s) in %ld seconds. I think it's dead, and I am evicting it. exp %p, cur %ld expire %ld last %ld\n",
618 obd_uuid2str(&exp->exp_client_uuid),
619 obd_export_nid2str(exp),
620 (long)(get_seconds() -
621 exp->exp_last_request_time),
622 exp, (long)get_seconds(),
624 (long)exp->exp_last_request_time);
625 CDEBUG(D_HA, "Last request was at %ld\n",
626 exp->exp_last_request_time);
627 class_fail_export(exp);
628 class_export_put(exp);
629 spin_lock(&obd->obd_dev_lock);
631 /* List is sorted, so everyone below is ok */
635 spin_unlock(&obd->obd_dev_lock);
637 spin_lock(&pet_lock);
638 list_del_init(&obd->obd_evict_list);
639 spin_unlock(&pet_lock);
641 class_decref(obd, "evictor", obd);
643 CDEBUG(D_HA, "Exiting Ping Evictor\n");
648 void ping_evictor_start(void)
650 struct task_struct *task;
652 if (++pet_refcount > 1)
655 init_waitqueue_head(&pet_waitq);
657 task = kthread_run(ping_evictor_main, NULL, "ll_evictor");
660 CERROR("Cannot start ping evictor thread: %ld\n",
664 EXPORT_SYMBOL(ping_evictor_start);
666 void ping_evictor_stop(void)
668 if (--pet_refcount > 0)
671 pet_state = PET_TERMINATE;
674 EXPORT_SYMBOL(ping_evictor_stop);