X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fptlrpc%2Fpinger.c;h=1e23babad2db46cdfbb445710ccf2676b1e87d4e;hp=d866933bbe87527bd999c22b8c146fc544683457;hb=c56f7675bfb17b3847b38044153e86550ced3c8e;hpb=c2424023bf0675c170571c3974fb8c2aadba4791;ds=sidebyside diff --git a/lustre/ptlrpc/pinger.c b/lustre/ptlrpc/pinger.c index d866933b..1e23bab 100644 --- a/lustre/ptlrpc/pinger.c +++ b/lustre/ptlrpc/pinger.c @@ -1,518 +1,714 @@ -/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- - * vim:expandtab:shiftwidth=8:tabstop=8: +/* + * GPL HEADER START * - * Portal-RPC reconnection and replay operations, for use in recovery. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. * - * Copyright (c) 2003 Cluster File Systems, Inc. - * Authors: Phil Schwan - * Mike Shaver + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). * - * This file is part of Lustre, http://www.lustre.org. + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * - * Lustre is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. * - * Lustre is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * GPL HEADER END + */ +/* + * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. * - * You should have received a copy of the GNU General Public License - * along with Lustre; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * Copyright (c) 2011, 2014, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/ptlrpc/pinger.c + * + * Portal-RPC reconnection and replay operations, for use in recovery. */ -#ifndef __KERNEL__ -#include -#else -#include -#include #define DEBUG_SUBSYSTEM S_RPC -#endif -#include -#include +#include +#include +#include #include "ptlrpc_internal.h" -#define PINGER_RATE 3 /* how many pings we'll do in obd_timeout period */ +static int suppress_pings; +CFS_MODULE_PARM(suppress_pings, "i", int, 0644, "Suppress pings"); + +struct mutex pinger_mutex; +static struct list_head pinger_imports = + LIST_HEAD_INIT(pinger_imports); +static struct list_head timeout_list = + LIST_HEAD_INIT(timeout_list); -static DECLARE_MUTEX(pinger_sem); -static struct list_head pinger_imports = LIST_HEAD_INIT(pinger_imports); +int ptlrpc_pinger_suppress_pings() +{ + return suppress_pings; +} +EXPORT_SYMBOL(ptlrpc_pinger_suppress_pings); -int ptlrpc_ping(struct obd_import *imp) +struct ptlrpc_request * +ptlrpc_prep_ping(struct obd_import *imp) { struct ptlrpc_request *req; - int rc = 0; - ENTRY; - req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, OBD_PING, 0, NULL, NULL); + req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, + LUSTRE_OBD_VERSION, OBD_PING); if (req) { - DEBUG_REQ(D_HA, req, "pinging %s->%s", - imp->imp_obd->obd_uuid.uuid, - imp->imp_target_uuid.uuid); + ptlrpc_request_set_replen(req); req->rq_no_resend = req->rq_no_delay = 1; - req->rq_replen = lustre_msg_size(0, NULL); - req->rq_timeout = obd_timeout / PINGER_RATE; - ptlrpcd_add_req(req); - } else { + } + return req; +} + +int ptlrpc_obd_ping(struct obd_device *obd) +{ + int rc; + struct ptlrpc_request *req; + ENTRY; + + req = ptlrpc_prep_ping(obd->u.cli.cl_import); + if (req == NULL) + RETURN(-ENOMEM); + + req->rq_send_state = LUSTRE_IMP_FULL; + + rc = ptlrpc_queue_wait(req); + + ptlrpc_req_finished(req); + + RETURN(rc); +} +EXPORT_SYMBOL(ptlrpc_obd_ping); + +static int ptlrpc_ping(struct obd_import *imp) +{ + struct ptlrpc_request *req; + ENTRY; + + req = ptlrpc_prep_ping(imp); + if (req == NULL) { CERROR("OOM trying to ping %s->%s\n", imp->imp_obd->obd_uuid.uuid, - imp->imp_target_uuid.uuid); - rc = -ENOMEM; + obd2cli_tgt(imp->imp_obd)); + RETURN(-ENOMEM); } - RETURN(rc); + DEBUG_REQ(D_INFO, req, "pinging %s->%s", + imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd)); + ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1); + + RETURN(0); } -#ifdef __KERNEL__ -static inline int ptlrpc_next_ping(struct obd_import *imp) +static void ptlrpc_update_next_ping(struct obd_import *imp, int soon) { - return jiffies + (obd_timeout / PINGER_RATE * HZ); +#ifdef ENABLE_PINGER + int time = soon ? PING_INTERVAL_SHORT : PING_INTERVAL; + if (imp->imp_state == LUSTRE_IMP_DISCON) { + int dtime = max_t(int, CONNECTION_SWITCH_MIN, + AT_OFF ? 0 : + at_get(&imp->imp_at.iat_net_latency)); + time = min(time, dtime); + } + imp->imp_next_ping = cfs_time_shift(time); +#endif /* ENABLE_PINGER */ } -static inline int ptlrpc_next_reconnect(struct obd_import *imp) +void ptlrpc_ping_import_soon(struct obd_import *imp) { - if (imp->imp_server_timeout) - return jiffies + (obd_timeout / 2 * HZ); - else - return jiffies + (obd_timeout * HZ); + imp->imp_next_ping = cfs_time_current(); } -static atomic_t suspend_timeouts = ATOMIC_INIT(0); -static wait_queue_head_t suspend_timeouts_waitq; +static inline int imp_is_deactive(struct obd_import *imp) +{ + return (imp->imp_deactive || + OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_IMP_DEACTIVE)); +} -void ptlrpc_deactivate_timeouts(void) +static inline int ptlrpc_next_reconnect(struct obd_import *imp) { - CDEBUG(D_HA, "deactivate timeouts\n"); - atomic_inc(&suspend_timeouts); + if (imp->imp_server_timeout) + return cfs_time_shift(obd_timeout / 2); + else + return cfs_time_shift(obd_timeout); } - -void ptlrpc_activate_timeouts(void) + +static cfs_duration_t pinger_check_timeout(cfs_time_t time) { - CDEBUG(D_HA, "activate timeouts\n"); - LASSERT(atomic_read(&suspend_timeouts) > 0); - if (atomic_dec_and_test(&suspend_timeouts)) - wake_up(&suspend_timeouts_waitq); + struct timeout_item *item; + cfs_time_t timeout = PING_INTERVAL; + + /* This list is sorted in increasing timeout order */ + mutex_lock(&pinger_mutex); + list_for_each_entry(item, &timeout_list, ti_chain) { + int ti_timeout = item->ti_timeout; + if (timeout > ti_timeout) + timeout = ti_timeout; + break; + } + mutex_unlock(&pinger_mutex); + + return cfs_time_sub(cfs_time_add(time, cfs_time_seconds(timeout)), + cfs_time_current()); } -int ptlrpc_check_suspend(void) + +static bool ir_up; + +void ptlrpc_pinger_ir_up(void) { - if (atomic_read(&suspend_timeouts)) - return 1; - return 0; + CDEBUG(D_HA, "IR up\n"); + ir_up = true; } +EXPORT_SYMBOL(ptlrpc_pinger_ir_up); -int ptlrpc_check_and_wait_suspend(struct ptlrpc_request *req) +void ptlrpc_pinger_ir_down(void) { - struct l_wait_info lwi; - - if (atomic_read(&suspend_timeouts)) { - DEBUG_REQ(D_NET, req, "-- suspend %d regular timeout", - atomic_read(&suspend_timeouts)); - lwi = LWI_INTR(NULL, NULL); - l_wait_event(suspend_timeouts_waitq, - atomic_read(&suspend_timeouts) == 0, &lwi); - DEBUG_REQ(D_NET, req, "-- recharge regular timeout"); - return 1; - } - return 0; + CDEBUG(D_HA, "IR down\n"); + ir_up = false; } +EXPORT_SYMBOL(ptlrpc_pinger_ir_down); static void ptlrpc_pinger_process_import(struct obd_import *imp, unsigned long this_ping) { - unsigned long flags; - int force, level; - - spin_lock_irqsave(&imp->imp_lock, flags); - level = imp->imp_state; - force = imp->imp_force_verify; - if (force) - imp->imp_force_verify = 0; - spin_unlock_irqrestore(&imp->imp_lock, flags); - - if (imp->imp_next_ping - this_ping > obd_timeout * HZ) { - CWARN("wrong ping time %lu (current %lu)\n", - imp->imp_next_ping, this_ping); - imp->imp_next_ping = ptlrpc_next_reconnect(imp); - } + int level; + int force; + int force_next; + int suppress; - if (imp->imp_next_ping > this_ping && force == 0) - return; + spin_lock(&imp->imp_lock); + + level = imp->imp_state; + force = imp->imp_force_verify; + force_next = imp->imp_force_next_verify; + /* + * This will be used below only if the import is "FULL". + */ + suppress = ir_up && OCD_HAS_FLAG(&imp->imp_connect_data, PINGLESS); + + imp->imp_force_verify = 0; + + if (cfs_time_aftereq(imp->imp_next_ping - 5 * CFS_TICK, this_ping) && + !force) { + spin_unlock(&imp->imp_lock); + return; + } - if (level == LUSTRE_IMP_DISCON && !imp->imp_deactive) { - /* wait at least a timeout before trying recovery again */ + imp->imp_force_next_verify = 0; + + spin_unlock(&imp->imp_lock); + + 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", + imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd), + ptlrpc_import_state_name(level), level, force, force_next, + imp->imp_deactive, imp->imp_pingable, suppress); + + if (level == LUSTRE_IMP_DISCON && !imp_is_deactive(imp)) { + /* wait for a while before trying recovery again */ imp->imp_next_ping = ptlrpc_next_reconnect(imp); - ptlrpc_initiate_recovery(imp); - } else if (level != LUSTRE_IMP_FULL || imp->imp_obd->obd_no_recov) { - CDEBUG(D_HA, "not pinging %s (in recovery " - " or recovery disabled: %s)\n", - imp->imp_target_uuid.uuid, - ptlrpc_import_state_name(level)); - } else if (imp->imp_pingable || force) { - imp->imp_next_ping = ptlrpc_next_ping(imp); - ptlrpc_ping(imp); - } + if (!imp->imp_no_pinger_recover) + ptlrpc_initiate_recovery(imp); + } else if (level != LUSTRE_IMP_FULL || + imp->imp_obd->obd_no_recov || + imp_is_deactive(imp)) { + CDEBUG(D_HA, "%s->%s: not pinging (in recovery " + "or recovery disabled: %s)\n", + imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd), + ptlrpc_import_state_name(level)); + if (force) { + spin_lock(&imp->imp_lock); + imp->imp_force_verify = 1; + spin_unlock(&imp->imp_lock); + } + } else if ((imp->imp_pingable && !suppress) || force_next || force) { + ptlrpc_ping(imp); + } } static int ptlrpc_pinger_main(void *arg) { - struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg; - struct ptlrpc_thread *thread = data->thread; - unsigned long flags; - ENTRY; - - lock_kernel(); - ptlrpc_daemonize(); - - SIGNAL_MASK_LOCK(current, flags); - sigfillset(¤t->blocked); - RECALC_SIGPENDING; - SIGNAL_MASK_UNLOCK(current, flags); - - LASSERTF(strlen(data->name) < sizeof(current->comm), - "name %d > len %d\n", - (int)strlen(data->name), (int)sizeof(current->comm)); - THREAD_NAME(current->comm, sizeof(current->comm) - 1, "%s", data->name); - unlock_kernel(); - - /* Record that the thread is running */ - thread->t_flags = SVC_RUNNING; - wake_up(&thread->t_ctl_waitq); - - /* And now, loop forever, pinging as needed. */ - while (1) { - unsigned long this_ping = jiffies; - long time_to_next_ping; - struct l_wait_info lwi = LWI_TIMEOUT(obd_timeout * HZ, - NULL, NULL); - struct list_head *iter; - - time_to_next_ping = this_ping + (obd_timeout * HZ) - jiffies; - down(&pinger_sem); - list_for_each(iter, &pinger_imports) { - struct obd_import *imp = - list_entry(iter, struct obd_import, - imp_pinger_chain); + struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg; + ENTRY; + + /* Record that the thread is running */ + thread_set_flags(thread, SVC_RUNNING); + wake_up(&thread->t_ctl_waitq); + + /* And now, loop forever, pinging as needed. */ + while (1) { + cfs_time_t this_ping = cfs_time_current(); + struct l_wait_info lwi; + cfs_duration_t time_to_next_wake; + struct timeout_item *item; + struct list_head *iter; + + mutex_lock(&pinger_mutex); + list_for_each_entry(item, &timeout_list, ti_chain) + item->ti_cb(item, item->ti_cb_data); + + list_for_each(iter, &pinger_imports) { + struct obd_import *imp = list_entry(iter, + struct obd_import, + imp_pinger_chain); ptlrpc_pinger_process_import(imp, this_ping); - - CDEBUG(D_OTHER, "%s: pingable %d, next_ping %lu(%lu)\n", - imp->imp_target_uuid.uuid, - imp->imp_pingable, imp->imp_next_ping, jiffies); - + /* obd_timeout might have changed */ if (imp->imp_pingable && imp->imp_next_ping && - imp->imp_next_ping - jiffies < time_to_next_ping && - imp->imp_next_ping > jiffies) - time_to_next_ping = imp->imp_next_ping - jiffies; + cfs_time_after(imp->imp_next_ping, + cfs_time_add(this_ping, + cfs_time_seconds(PING_INTERVAL)))) + ptlrpc_update_next_ping(imp, 0); } - up(&pinger_sem); + mutex_unlock(&pinger_mutex); + /* update memory usage info */ + obd_update_maxusage(); /* Wait until the next ping time, or until we're stopped. */ - CDEBUG(D_HA, "next ping in %lu (%lu)\n", time_to_next_ping, - this_ping + (obd_timeout * HZ)); - if (time_to_next_ping > 0) { - lwi = LWI_TIMEOUT(time_to_next_ping, NULL, NULL); + time_to_next_wake = pinger_check_timeout(this_ping); + /* The ping sent by ptlrpc_send_rpc may get sent out + say .01 second after this. + ptlrpc_pinger_sending_on_import will then set the + next ping time to next_ping + .01 sec, which means + we will SKIP the next ping at next_ping, and the + ping will get sent 2 timeouts from now! Beware. */ + CDEBUG(D_INFO, "next wakeup in "CFS_DURATION_T" (" + CFS_TIME_T")\n", time_to_next_wake, + cfs_time_add(this_ping,cfs_time_seconds(PING_INTERVAL))); + if (time_to_next_wake > 0) { + lwi = LWI_TIMEOUT(max_t(cfs_duration_t, + time_to_next_wake, + cfs_time_seconds(1)), + NULL, NULL); l_wait_event(thread->t_ctl_waitq, - thread->t_flags & (SVC_STOPPING|SVC_EVENT), + thread_is_stopping(thread) || + thread_is_event(thread), &lwi); - if (thread->t_flags & SVC_STOPPING) { - thread->t_flags &= ~SVC_STOPPING; + if (thread_test_and_clear_flags(thread, SVC_STOPPING)) { EXIT; break; - } else if (thread->t_flags & SVC_EVENT) { + } else { /* woken after adding import to reset timer */ - thread->t_flags &= ~SVC_EVENT; + thread_test_and_clear_flags(thread, SVC_EVENT); } } } - thread->t_flags = SVC_STOPPED; - wake_up(&thread->t_ctl_waitq); + thread_set_flags(thread, SVC_STOPPED); + wake_up(&thread->t_ctl_waitq); - CDEBUG(D_NET, "pinger thread exiting, process %d\n", current->pid); - return 0; + CDEBUG(D_NET, "pinger thread exiting, process %d\n", current_pid()); + return 0; } -static struct ptlrpc_thread *pinger_thread = NULL; +static struct ptlrpc_thread pinger_thread; int ptlrpc_start_pinger(void) { - struct l_wait_info lwi = { 0 }; - struct ptlrpc_svc_data d; - int rc; + struct l_wait_info lwi = { 0 }; + struct task_struct *task; + int rc; #ifndef ENABLE_PINGER - return 0; + return 0; #endif - ENTRY; + ENTRY; - LASSERT(obd_timeout > PINGER_RATE); + if (!thread_is_init(&pinger_thread) && + !thread_is_stopped(&pinger_thread)) + RETURN(-EALREADY); - if (pinger_thread != NULL) - RETURN(-EALREADY); + init_waitqueue_head(&pinger_thread.t_ctl_waitq); - OBD_ALLOC(pinger_thread, sizeof(*pinger_thread)); - if (pinger_thread == NULL) - RETURN(-ENOMEM); - init_waitqueue_head(&pinger_thread->t_ctl_waitq); - init_waitqueue_head(&suspend_timeouts_waitq); - - d.name = "ll_ping"; - d.thread = pinger_thread; - - /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we - * just drop the VM and FILES in ptlrpc_daemonize() right away. */ - rc = kernel_thread(ptlrpc_pinger_main, &d, CLONE_VM | CLONE_FILES); - if (rc < 0) { - CERROR("cannot start thread: %d\n", rc); - OBD_FREE(pinger_thread, sizeof(*pinger_thread)); - RETURN(rc); - } - l_wait_event(pinger_thread->t_ctl_waitq, - pinger_thread->t_flags & SVC_RUNNING, &lwi); + strcpy(pinger_thread.t_name, "ll_ping"); - RETURN(rc); + /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we + * just drop the VM and FILES in kthread_run() right away. */ + task = kthread_run(ptlrpc_pinger_main, &pinger_thread, + pinger_thread.t_name); + if (IS_ERR(task)) { + rc = PTR_ERR(task); + CERROR("cannot start pinger thread: rc = %d\n", rc); + RETURN(rc); + } + + l_wait_event(pinger_thread.t_ctl_waitq, + thread_is_running(&pinger_thread), &lwi); + + if (suppress_pings) + 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"); + + RETURN(0); } +int ptlrpc_pinger_remove_timeouts(void); + int ptlrpc_stop_pinger(void) { - struct l_wait_info lwi = { 0 }; - int rc = 0; + struct l_wait_info lwi = { 0 }; #ifndef ENABLE_PINGER - return 0; + return 0; #endif - ENTRY; + ENTRY; - if (pinger_thread == NULL) - RETURN(-EALREADY); - down(&pinger_sem); - pinger_thread->t_flags = SVC_STOPPING; - wake_up(&pinger_thread->t_ctl_waitq); - up(&pinger_sem); + if (thread_is_init(&pinger_thread) || + thread_is_stopped(&pinger_thread)) + RETURN(-EALREADY); - l_wait_event(pinger_thread->t_ctl_waitq, - (pinger_thread->t_flags & SVC_STOPPED), &lwi); + ptlrpc_pinger_remove_timeouts(); - OBD_FREE(pinger_thread, sizeof(*pinger_thread)); - pinger_thread = NULL; - RETURN(rc); + thread_set_flags(&pinger_thread, SVC_STOPPING); + wake_up(&pinger_thread.t_ctl_waitq); + + l_wait_event(pinger_thread.t_ctl_waitq, + thread_is_stopped(&pinger_thread), &lwi); + RETURN(0); } void ptlrpc_pinger_sending_on_import(struct obd_import *imp) { - down(&pinger_sem); - imp->imp_next_ping = ptlrpc_next_ping(imp); - up(&pinger_sem); + ptlrpc_update_next_ping(imp, 0); +} + +void ptlrpc_pinger_commit_expected(struct obd_import *imp) +{ + ptlrpc_update_next_ping(imp, 1); + assert_spin_locked(&imp->imp_lock); + /* + * Avoid reading stale imp_connect_data. When not sure if pings are + * expected or not on next connection, we assume they are not and force + * one anyway to guarantee the chance of updating + * imp_peer_committed_transno. + */ + if (imp->imp_state != LUSTRE_IMP_FULL || + OCD_HAS_FLAG(&imp->imp_connect_data, PINGLESS)) + imp->imp_force_next_verify = 1; } int ptlrpc_pinger_add_import(struct obd_import *imp) { ENTRY; - if (!list_empty(&imp->imp_pinger_chain)) + if (!list_empty(&imp->imp_pinger_chain)) RETURN(-EALREADY); - down(&pinger_sem); + mutex_lock(&pinger_mutex); CDEBUG(D_HA, "adding pingable import %s->%s\n", - imp->imp_obd->obd_uuid.uuid, imp->imp_target_uuid.uuid); - imp->imp_next_ping = jiffies + (obd_timeout * HZ); + imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd)); + /* if we add to pinger we want recovery on this import */ + imp->imp_obd->obd_no_recov = 0; + ptlrpc_update_next_ping(imp, 0); /* XXX sort, blah blah */ - list_add_tail(&imp->imp_pinger_chain, &pinger_imports); + list_add_tail(&imp->imp_pinger_chain, &pinger_imports); class_import_get(imp); ptlrpc_pinger_wake_up(); - up(&pinger_sem); + mutex_unlock(&pinger_mutex); RETURN(0); } +EXPORT_SYMBOL(ptlrpc_pinger_add_import); int ptlrpc_pinger_del_import(struct obd_import *imp) { - ENTRY; - if (list_empty(&imp->imp_pinger_chain)) - RETURN(-ENOENT); - - down(&pinger_sem); - list_del_init(&imp->imp_pinger_chain); - CDEBUG(D_HA, "removing pingable import %s->%s\n", - imp->imp_obd->obd_uuid.uuid, imp->imp_target_uuid.uuid); - class_import_put(imp); - up(&pinger_sem); - RETURN(0); + ENTRY; + + if (list_empty(&imp->imp_pinger_chain)) + RETURN(-ENOENT); + + mutex_lock(&pinger_mutex); + list_del_init(&imp->imp_pinger_chain); + CDEBUG(D_HA, "removing pingable import %s->%s\n", + imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd)); + /* if we remove from pinger we don't want recovery on this import */ + imp->imp_obd->obd_no_recov = 1; + class_import_put(imp); + mutex_unlock(&pinger_mutex); + RETURN(0); } +EXPORT_SYMBOL(ptlrpc_pinger_del_import); -void ptlrpc_pinger_wake_up() +/** + * Register a timeout callback to the pinger list, and the callback will + * be called when timeout happens. + */ +static struct timeout_item *ptlrpc_new_timeout(int time, + enum timeout_event event, + timeout_cb_t cb, void *data) { -#ifdef ENABLE_PINGER - pinger_thread->t_flags |= SVC_EVENT; - wake_up(&pinger_thread->t_ctl_waitq); -#endif -} + struct timeout_item *ti; -#else /* !__KERNEL__ */ + OBD_ALLOC_PTR(ti); + if (!ti) + return(NULL); -/* XXX - * the current implementation of pinger in liblustre is not optimized - */ + INIT_LIST_HEAD(&ti->ti_obd_list); + INIT_LIST_HEAD(&ti->ti_chain); + ti->ti_timeout = time; + ti->ti_event = event; + ti->ti_cb = cb; + ti->ti_cb_data = data; -static struct pinger_data { - int pd_recursion; - unsigned long pd_this_ping; - unsigned long pd_next_ping; - int pd_force_check; -} pinger_args; + return ti; +} -static int pinger_check_rpcs(void *arg) +/** + * Register timeout event on the the pinger thread. + * Note: the timeout list is an sorted list with increased timeout value. + */ +static struct timeout_item* +ptlrpc_pinger_register_timeout(int time, enum timeout_event event, + timeout_cb_t cb, void *data) { - unsigned long curtime = time(NULL); - struct list_head *iter; - struct pinger_data *pd = &pinger_args; - - /* prevent recursion */ - if (pd->pd_recursion++) { - CDEBUG(D_HA, "pinger: recursion! quit\n"); - pd->pd_recursion--; - return 0; - } - - /* have we reached ping point? */ - if (pd->pd_next_ping > curtime && !pd->pd_force_check) { - pd->pd_recursion--; - return 0; - } + struct timeout_item *item, *tmp; + + LASSERT(mutex_is_locked(&pinger_mutex)); + + list_for_each_entry(item, &timeout_list, ti_chain) + if (item->ti_event == event) + goto out; + + item = ptlrpc_new_timeout(time, event, cb, data); + if (item) { + list_for_each_entry_reverse(tmp, &timeout_list, ti_chain) { + if (tmp->ti_timeout < time) { + list_add(&item->ti_chain, &tmp->ti_chain); + goto out; + } + } + list_add(&item->ti_chain, &timeout_list); + } +out: + return item; +} - if (pd->pd_force_check) - pd->pd_force_check = 0; - - pd->pd_this_ping = curtime; - - /* add rpcs into set */ - down(&pinger_sem); - list_for_each(iter, &pinger_imports) { - struct obd_import *imp = - list_entry(iter, struct obd_import, - imp_pinger_chain); - int level, force; - unsigned long flags; - - - spin_lock_irqsave(&imp->imp_lock, flags); - level = imp->imp_state; - force = imp->imp_force_verify; - if (force) - imp->imp_force_verify = 0; - spin_unlock_irqrestore(&imp->imp_lock, flags); - - if (imp->imp_next_ping <= pd->pd_this_ping || force) { - if (level == LUSTRE_IMP_DISCON) { - /* wait at least a timeout before - trying recovery again. */ - unsigned long timeout = obd_timeout; - if (imp->imp_server_timeout) - timeout = obd_timeout / 2; - imp->imp_next_ping = time(NULL) + - (timeout * HZ); - ptlrpc_initiate_recovery(imp); - } - else if (level != LUSTRE_IMP_FULL || - imp->imp_obd->obd_no_recov) { - CDEBUG(D_HA, - "not pinging %s (in recovery " - " or recovery disabled: %s)\n", - imp->imp_target_uuid.uuid, - ptlrpc_import_state_name(level)); - } - else if (imp->imp_pingable || force) { - ptlrpc_ping(imp); - } +/* Add a client_obd to the timeout event list, when timeout(@time) + * happens, the callback(@cb) will be called. + */ +int ptlrpc_add_timeout_client(int time, enum timeout_event event, + timeout_cb_t cb, void *data, + struct list_head *obd_list) +{ + struct timeout_item *ti; - } else { - if (imp->imp_pingable) { - CDEBUG(D_HA, "don't need to ping %s " - "(%lu > %lu)\n", - imp->imp_target_uuid.uuid, - imp->imp_next_ping, pd->pd_this_ping); - } - } + mutex_lock(&pinger_mutex); + ti = ptlrpc_pinger_register_timeout(time, event, cb, data); + if (!ti) { + mutex_unlock(&pinger_mutex); + return (-EINVAL); } - - up(&pinger_sem); - - pd->pd_next_ping = pd->pd_this_ping + (obd_timeout * HZ); - - CDEBUG(D_HA, "finished a round ping\n"); - pd->pd_recursion--; + list_add(obd_list, &ti->ti_obd_list); + mutex_unlock(&pinger_mutex); return 0; } +EXPORT_SYMBOL(ptlrpc_add_timeout_client); -static void *pinger_callback = NULL; +int ptlrpc_del_timeout_client(struct list_head *obd_list, + enum timeout_event event) +{ + struct timeout_item *ti = NULL, *item; + + if (list_empty(obd_list)) + return 0; + mutex_lock(&pinger_mutex); + list_del_init(obd_list); + /** + * If there are no obd attached to the timeout event + * list, remove this timeout event from the pinger + */ + list_for_each_entry(item, &timeout_list, ti_chain) { + if (item->ti_event == event) { + ti = item; + break; + } + } + LASSERTF(ti != NULL, "ti is NULL !\n"); + if (list_empty(&ti->ti_obd_list)) { + list_del(&ti->ti_chain); + OBD_FREE_PTR(ti); + } + mutex_unlock(&pinger_mutex); + return 0; +} +EXPORT_SYMBOL(ptlrpc_del_timeout_client); -int ptlrpc_start_pinger(void) +int ptlrpc_pinger_remove_timeouts(void) { - memset(&pinger_args, 0, sizeof(pinger_args)); -#ifdef ENABLE_PINGER - pinger_callback = - liblustre_register_wait_callback(&pinger_check_rpcs, &pinger_args); -#endif + struct timeout_item *item, *tmp; + + mutex_lock(&pinger_mutex); + list_for_each_entry_safe(item, tmp, &timeout_list, ti_chain) { + LASSERT(list_empty(&item->ti_obd_list)); + list_del(&item->ti_chain); + OBD_FREE_PTR(item); + } + mutex_unlock(&pinger_mutex); return 0; } -int ptlrpc_stop_pinger(void) +void ptlrpc_pinger_wake_up() { #ifdef ENABLE_PINGER - if (pinger_callback) - liblustre_deregister_wait_callback(pinger_callback); + thread_add_flags(&pinger_thread, SVC_EVENT); + wake_up(&pinger_thread.t_ctl_waitq); #endif - return 0; } -void ptlrpc_pinger_sending_on_import(struct obd_import *imp) +/* Ping evictor thread */ +#define PET_READY 1 +#define PET_TERMINATE 2 + +static int pet_refcount = 0; +static int pet_state; +static wait_queue_head_t pet_waitq; +static struct list_head pet_list; +static DEFINE_SPINLOCK(pet_lock); + +int ping_evictor_wake(struct obd_export *exp) { - down(&pinger_sem); - imp->imp_next_ping = time(NULL) + obd_timeout; - if (pinger_args.pd_next_ping > imp->imp_next_ping) { - CDEBUG(D_HA, "set next ping to %ld(cur %ld)\n", - imp->imp_next_ping, time(NULL)); - pinger_args.pd_next_ping = imp->imp_next_ping; - } - up(&pinger_sem); + struct obd_device *obd; + + spin_lock(&pet_lock); + if (pet_state != PET_READY) { + /* eventually the new obd will call here again. */ + spin_unlock(&pet_lock); + return 1; + } + + obd = class_exp2obd(exp); + if (list_empty(&obd->obd_evict_list)) { + class_incref(obd, "evictor", obd); + list_add(&obd->obd_evict_list, &pet_list); + } + spin_unlock(&pet_lock); + + wake_up(&pet_waitq); + return 0; } -int ptlrpc_pinger_add_import(struct obd_import *imp) +static int ping_evictor_main(void *arg) { + struct obd_device *obd; + struct obd_export *exp; + struct l_wait_info lwi = { 0 }; + time_t expire_time; ENTRY; - if (!list_empty(&imp->imp_pinger_chain)) - RETURN(-EALREADY); - CDEBUG(D_HA, "adding pingable import %s->%s\n", - imp->imp_obd->obd_uuid.uuid, imp->imp_target_uuid.uuid); - ptlrpc_pinger_sending_on_import(imp); - - down(&pinger_sem); - list_add_tail(&imp->imp_pinger_chain, &pinger_imports); - class_import_get(imp); - up(&pinger_sem); + unshare_fs_struct(); + + CDEBUG(D_HA, "Starting Ping Evictor\n"); + pet_state = PET_READY; + while (1) { + l_wait_event(pet_waitq, (!list_empty(&pet_list)) || + (pet_state == PET_TERMINATE), &lwi); + + /* loop until all obd's will be removed */ + if ((pet_state == PET_TERMINATE) && list_empty(&pet_list)) + break; + + /* we only get here if pet_exp != NULL, and the end of this + * loop is the only place which sets it NULL again, so lock + * is not strictly necessary. */ + spin_lock(&pet_lock); + obd = list_entry(pet_list.next, struct obd_device, + obd_evict_list); + spin_unlock(&pet_lock); + + expire_time = cfs_time_current_sec() - PING_EVICT_TIMEOUT; + + CDEBUG(D_HA, "evicting all exports of obd %s older than %ld\n", + obd->obd_name, expire_time); + + /* Exports can't be deleted out of the list while we hold + * the obd lock (class_unlink_export), which means we can't + * lose the last ref on the export. If they've already been + * removed from the list, we won't find them here. */ + spin_lock(&obd->obd_dev_lock); + while (!list_empty(&obd->obd_exports_timed)) { + exp = list_entry(obd->obd_exports_timed.next, + struct obd_export, + exp_obd_chain_timed); + if (expire_time > exp->exp_last_request_time) { + class_export_get(exp); + spin_unlock(&obd->obd_dev_lock); + 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", + obd->obd_name, + obd_uuid2str(&exp->exp_client_uuid), + obd_export_nid2str(exp), + (long)(cfs_time_current_sec() - + exp->exp_last_request_time), + exp, (long)cfs_time_current_sec(), + (long)expire_time, + (long)exp->exp_last_request_time); + CDEBUG(D_HA, "Last request was at %ld\n", + exp->exp_last_request_time); + class_fail_export(exp); + class_export_put(exp); + spin_lock(&obd->obd_dev_lock); + } else { + /* List is sorted, so everyone below is ok */ + break; + } + } + spin_unlock(&obd->obd_dev_lock); + + spin_lock(&pet_lock); + list_del_init(&obd->obd_evict_list); + spin_unlock(&pet_lock); + + class_decref(obd, "evictor", obd); + } + CDEBUG(D_HA, "Exiting Ping Evictor\n"); RETURN(0); } -int ptlrpc_pinger_del_import(struct obd_import *imp) +void ping_evictor_start(void) { - ENTRY; - if (list_empty(&imp->imp_pinger_chain)) - RETURN(-ENOENT); - - down(&pinger_sem); - list_del_init(&imp->imp_pinger_chain); - CDEBUG(D_HA, "removing pingable import %s->%s\n", - imp->imp_obd->obd_uuid.uuid, imp->imp_target_uuid.uuid); - class_import_put(imp); - up(&pinger_sem); - RETURN(0); + struct task_struct *task; + + if (++pet_refcount > 1) + return; + + INIT_LIST_HEAD(&pet_list); + init_waitqueue_head(&pet_waitq); + + task = kthread_run(ping_evictor_main, NULL, "ll_evictor"); + if (IS_ERR(task)) { + pet_refcount--; + CERROR("Cannot start ping evictor thread: %ld\n", + PTR_ERR(task)); + } } +EXPORT_SYMBOL(ping_evictor_start); -void ptlrpc_pinger_wake_up() +void ping_evictor_stop(void) { - pinger_args.pd_force_check = 1; + if (--pet_refcount > 0) + return; + + pet_state = PET_TERMINATE; + wake_up(&pet_waitq); } -#endif /* !__KERNEL__ */ +EXPORT_SYMBOL(ping_evictor_stop);