--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * 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.
+ *
+ * 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).
+ *
+ * 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
+ *
+ * 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.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, 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.
+ */
+
+#define DEBUG_SUBSYSTEM S_RPC
+
+#include "../include/obd_support.h"
+#include "../include/obd_class.h"
+#include "ptlrpc_internal.h"
+
+static int suppress_pings;
+module_param(suppress_pings, int, 0644);
+MODULE_PARM_DESC(suppress_pings, "Suppress pings");
+
+struct mutex pinger_mutex;
+static LIST_HEAD(pinger_imports);
+static struct list_head timeout_list = LIST_HEAD_INIT(timeout_list);
+
+int ptlrpc_pinger_suppress_pings(void)
+{
+ return suppress_pings;
+}
+EXPORT_SYMBOL(ptlrpc_pinger_suppress_pings);
+
+struct ptlrpc_request *
+ptlrpc_prep_ping(struct obd_import *imp)
+{
+ struct ptlrpc_request *req;
+
+ req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING,
+ LUSTRE_OBD_VERSION, OBD_PING);
+ if (req) {
+ ptlrpc_request_set_replen(req);
+ req->rq_no_resend = req->rq_no_delay = 1;
+ }
+ return req;
+}
+
+int ptlrpc_obd_ping(struct obd_device *obd)
+{
+ int rc;
+ struct ptlrpc_request *req;
+
+ 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);
+
+int ptlrpc_ping(struct obd_import *imp)
+{
+ struct ptlrpc_request *req;
+
+ req = ptlrpc_prep_ping(imp);
+ if (req == NULL) {
+ CERROR("OOM trying to ping %s->%s\n",
+ imp->imp_obd->obd_uuid.uuid,
+ obd2cli_tgt(imp->imp_obd));
+ return -ENOMEM;
+ }
+
+ 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;
+}
+
+void ptlrpc_update_next_ping(struct obd_import *imp, int soon)
+{
+ 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);
+}
+
+void ptlrpc_ping_import_soon(struct obd_import *imp)
+{
+ imp->imp_next_ping = cfs_time_current();
+}
+
+static inline int imp_is_deactive(struct obd_import *imp)
+{
+ return (imp->imp_deactive ||
+ OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_IMP_DEACTIVE));
+}
+
+static inline int ptlrpc_next_reconnect(struct obd_import *imp)
+{
+ if (imp->imp_server_timeout)
+ return cfs_time_shift(obd_timeout / 2);
+ else
+ return cfs_time_shift(obd_timeout);
+}
+
+long pinger_check_timeout(unsigned long time)
+{
+ struct timeout_item *item;
+ unsigned long timeout = PING_INTERVAL;
+
+ /* The timeout list is a increase order sorted list */
+ 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());
+}
+
+static bool ir_up;
+
+void ptlrpc_pinger_ir_up(void)
+{
+ CDEBUG(D_HA, "IR up\n");
+ ir_up = true;
+}
+EXPORT_SYMBOL(ptlrpc_pinger_ir_up);
+
+void ptlrpc_pinger_ir_down(void)
+{
+ 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)
+{
+ int level;
+ int force;
+ int force_next;
+ int suppress;
+
+ 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;
+ }
+
+ 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);
+ 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_thread *thread = (struct ptlrpc_thread *)arg;
+
+ /* 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) {
+ unsigned long this_ping = cfs_time_current();
+ struct l_wait_info lwi;
+ long 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);
+ /* obd_timeout might have changed */
+ if (imp->imp_pingable && imp->imp_next_ping &&
+ cfs_time_after(imp->imp_next_ping,
+ cfs_time_add(this_ping,
+ cfs_time_seconds(PING_INTERVAL))))
+ ptlrpc_update_next_ping(imp, 0);
+ }
+ mutex_unlock(&pinger_mutex);
+ /* update memory usage info */
+ obd_update_maxusage();
+
+ /* Wait until the next ping time, or until we're stopped. */
+ 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(long, time_to_next_wake,
+ cfs_time_seconds(1)),
+ NULL, NULL);
+ l_wait_event(thread->t_ctl_waitq,
+ thread_is_stopping(thread) ||
+ thread_is_event(thread),
+ &lwi);
+ if (thread_test_and_clear_flags(thread, SVC_STOPPING)) {
+ break;
+ } else {
+ /* woken after adding import to reset timer */
+ thread_test_and_clear_flags(thread, SVC_EVENT);
+ }
+ }
+ }
+
+ 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;
+}
+
+static struct ptlrpc_thread pinger_thread;
+
+int ptlrpc_start_pinger(void)
+{
+ struct l_wait_info lwi = { 0 };
+ int rc;
+
+ if (!thread_is_init(&pinger_thread) &&
+ !thread_is_stopped(&pinger_thread))
+ return -EALREADY;
+
+ init_waitqueue_head(&pinger_thread.t_ctl_waitq);
+
+ strcpy(pinger_thread.t_name, "ll_ping");
+
+ /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
+ * just drop the VM and FILES in cfs_daemonize_ctxt() right away. */
+ rc = PTR_ERR(kthread_run(ptlrpc_pinger_main, &pinger_thread,
+ "%s", pinger_thread.t_name));
+ if (IS_ERR_VALUE(rc)) {
+ CERROR("cannot start thread: %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;
+
+ if (thread_is_init(&pinger_thread) ||
+ thread_is_stopped(&pinger_thread))
+ return -EALREADY;
+
+ ptlrpc_pinger_remove_timeouts();
+ 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 rc;
+}
+
+void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
+{
+ ptlrpc_update_next_ping(imp, 0);
+}
+EXPORT_SYMBOL(ptlrpc_pinger_sending_on_import);
+
+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)
+{
+ if (!list_empty(&imp->imp_pinger_chain))
+ return -EALREADY;
+
+ mutex_lock(&pinger_mutex);
+ CDEBUG(D_HA, "adding pingable import %s->%s\n",
+ 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);
+ class_import_get(imp);
+
+ ptlrpc_pinger_wake_up();
+ mutex_unlock(&pinger_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL(ptlrpc_pinger_add_import);
+
+int ptlrpc_pinger_del_import(struct obd_import *imp)
+{
+ 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);
+
+/**
+ * Register a timeout callback to the pinger list, and the callback will
+ * be called when timeout happens.
+ */
+struct timeout_item *ptlrpc_new_timeout(int time, enum timeout_event event,
+ timeout_cb_t cb, void *data)
+{
+ struct timeout_item *ti;
+
+ OBD_ALLOC_PTR(ti);
+ if (!ti)
+ return NULL;
+
+ 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;
+
+ return ti;
+}
+
+/**
+ * Register timeout event on 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)
+{
+ 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;
+}
+
+/* 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;
+
+ mutex_lock(&pinger_mutex);
+ ti = ptlrpc_pinger_register_timeout(time, event, cb, data);
+ if (!ti) {
+ mutex_unlock(&pinger_mutex);
+ return -EINVAL;
+ }
+ list_add(obd_list, &ti->ti_obd_list);
+ mutex_unlock(&pinger_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(ptlrpc_add_timeout_client);
+
+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_pinger_remove_timeouts(void)
+{
+ 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;
+}
+
+void ptlrpc_pinger_wake_up(void)
+{
+ thread_add_flags(&pinger_thread, SVC_EVENT);
+ wake_up(&pinger_thread.t_ctl_waitq);
+}
+
+/* Ping evictor thread */
+#define PET_READY 1
+#define PET_TERMINATE 2
+
+static int pet_refcount;
+static int pet_state;
+static wait_queue_head_t pet_waitq;
+LIST_HEAD(pet_list);
+static DEFINE_SPINLOCK(pet_lock);
+
+int ping_evictor_wake(struct obd_export *exp)
+{
+ 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;
+}
+
+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;
+
+ 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 = get_seconds() - 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)(get_seconds() -
+ exp->exp_last_request_time),
+ exp, (long)get_seconds(),
+ (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;
+}
+
+void ping_evictor_start(void)
+{
+ struct task_struct *task;
+
+ if (++pet_refcount > 1)
+ return;
+
+ 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 ping_evictor_stop(void)
+{
+ if (--pet_refcount > 0)
+ return;
+
+ pet_state = PET_TERMINATE;
+ wake_up(&pet_waitq);
+}
+EXPORT_SYMBOL(ping_evictor_stop);
Code Review / kvmfornfv.git / blobdiff