-/* -*- 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.
+ *
+ * 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).
*
- * Copyright (c) 2003 Cluster File Systems, Inc.
- * Authors: Phil Schwan <phil@clusterfs.com>
- * Mike Shaver <shaver@clusterfs.com>
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
- * This file is part of Lustre, http://www.lustre.org.
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
*
- * 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.
+ * Copyright (c) 2011, 2015, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*
- * 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.
+ * lustre/ptlrpc/pinger.c
*
- * 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.
+ * Portal-RPC reconnection and replay operations, for use in recovery.
*/
-#ifndef __KERNEL__
-#include <liblustre.h>
-#else
-#include <linux/version.h>
-#include <asm/semaphore.h>
#define DEBUG_SUBSYSTEM S_RPC
-#endif
-#include <linux/obd_support.h>
-#include <linux/obd_class.h>
+#include <linux/kthread.h>
+#include <linux/workqueue.h>
+#include <obd_support.h>
+#include <obd_class.h>
#include "ptlrpc_internal.h"
-static DECLARE_MUTEX(pinger_sem);
-static struct list_head pinger_imports = LIST_HEAD_INIT(pinger_imports);
+static int suppress_pings;
+module_param(suppress_pings, int, 0644);
+MODULE_PARM_DESC(suppress_pings, "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);
-int ptlrpc_ping(struct obd_import *imp)
+int ptlrpc_pinger_suppress_pings(void)
{
- struct ptlrpc_request *req;
- int rc = 0;
- ENTRY;
-
- req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL,
- NULL);
- if (req) {
- DEBUG_REQ(D_HA, req, "pinging %s->%s",
- imp->imp_obd->obd_uuid.uuid,
- imp->imp_target_uuid.uuid);
- req->rq_no_resend = req->rq_no_delay = 1;
- req->rq_replen = lustre_msg_size(0,
- NULL);
- ptlrpcd_add_req(req);
- } else {
- CERROR("OOM trying to ping %s->%s\n",
- imp->imp_obd->obd_uuid.uuid,
- imp->imp_target_uuid.uuid);
- rc = -ENOMEM;
- }
-
- RETURN(rc);
+ return suppress_pings;
}
+EXPORT_SYMBOL(ptlrpc_pinger_suppress_pings);
-#ifdef __KERNEL__
-int ptlrpc_next_ping(struct obd_import *imp)
+struct ptlrpc_request *
+ptlrpc_prep_ping(struct obd_import *imp)
{
- if (imp->imp_server_timeout)
- return jiffies + (obd_timeout / 4 * HZ);
- else
- return jiffies + (obd_timeout / 2 * HZ);
+ 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;
}
-static int ptlrpc_pinger_main(void *arg)
+int ptlrpc_obd_ping(struct obd_device *obd)
{
- 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);
- int force, level;
- 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 <= this_ping || force) {
- if (level == LUSTRE_IMP_DISCON) {
- /* wait at least a timeout before
- trying recovery again. */
- imp->imp_next_ping =
- ptlrpc_next_ping(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) {
- ptlrpc_ping(imp);
- }
-
- } 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, 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);
- 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;
- }
- up(&pinger_sem);
-
- /* 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);
- l_wait_event(thread->t_ctl_waitq,
- thread->t_flags & (SVC_STOPPING|SVC_EVENT),
- &lwi);
- if (thread->t_flags & SVC_STOPPING) {
- thread->t_flags &= ~SVC_STOPPING;
- EXIT;
- break;
- } else if (thread->t_flags & SVC_EVENT) {
- /* woken after adding import to reset timer */
- thread->t_flags &= ~SVC_EVENT;
- }
- }
- }
-
- thread->t_flags = SVC_STOPPED;
- wake_up(&thread->t_ctl_waitq);
-
- CDEBUG(D_NET, "pinger thread exiting, process %d\n", current->pid);
- return 0;
-}
+ int rc;
+ struct ptlrpc_request *req;
-static struct ptlrpc_thread *pinger_thread = NULL;
+ ENTRY;
-int ptlrpc_start_pinger(void)
+ req = ptlrpc_prep_ping(obd->u.cli.cl_import);
+ if (!req)
+ 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 bool ptlrpc_check_import_is_idle(struct obd_import *imp)
{
- struct l_wait_info lwi = { 0 };
- struct ptlrpc_svc_data d;
- int rc;
-#ifndef ENABLE_PINGER
- return 0;
-#endif
- ENTRY;
-
- if (pinger_thread != NULL)
- RETURN(-EALREADY);
-
- OBD_ALLOC(pinger_thread, sizeof(*pinger_thread));
- if (pinger_thread == NULL)
- RETURN(-ENOMEM);
- init_waitqueue_head(&pinger_thread->t_ctl_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);
-
- RETURN(rc);
+ struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
+ time64_t now;
+
+ if (!imp->imp_idle_timeout)
+ return false;
+
+ /*
+ * 4 comes from:
+ * - client_obd_setup() - hashed import
+ * - ptlrpcd_alloc_work()
+ * - ptlrpcd_alloc_work()
+ * - ptlrpc_pinger_add_import
+ */
+ if (atomic_read(&imp->imp_refcount) > 4)
+ return false;
+
+ /* any lock increases ns_bref being a resource holder */
+ if (ns && atomic_read(&ns->ns_bref) > 0)
+ return false;
+
+ now = ktime_get_real_seconds();
+ if (now - imp->imp_last_reply_time < imp->imp_idle_timeout)
+ return false;
+
+ return true;
}
-int ptlrpc_stop_pinger(void)
+static int ptlrpc_ping(struct obd_import *imp)
{
- struct l_wait_info lwi = { 0 };
- int rc = 0;
-#ifndef ENABLE_PINGER
- return 0;
-#endif
- ENTRY;
+ struct ptlrpc_request *req;
+
+ ENTRY;
+
+ if (ptlrpc_check_import_is_idle(imp))
+ RETURN(ptlrpc_disconnect_and_idle_import(imp));
- 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);
+ req = ptlrpc_prep_ping(imp);
+ if (!req) {
+ CERROR("OOM trying to ping %s->%s\n",
+ imp->imp_obd->obd_uuid.uuid,
+ obd2cli_tgt(imp->imp_obd));
+ RETURN(-ENOMEM);
+ }
- l_wait_event(pinger_thread->t_ctl_waitq,
- (pinger_thread->t_flags & SVC_STOPPED), &lwi);
+ DEBUG_REQ(D_INFO, req, "pinging %s->%s",
+ imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
+ ptlrpcd_add_req(req);
- OBD_FREE(pinger_thread, sizeof(*pinger_thread));
- pinger_thread = NULL;
- RETURN(rc);
+ RETURN(0);
}
-void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
+static void ptlrpc_update_next_ping(struct obd_import *imp, int soon)
{
- down(&pinger_sem);
- imp->imp_next_ping = jiffies + (obd_timeout * HZ);
- up(&pinger_sem);
+#ifdef ENABLE_PINGER
+ time64_t time = soon ? PING_INTERVAL_SHORT : PING_INTERVAL;
+
+ if (imp->imp_state == LUSTRE_IMP_DISCON) {
+ time64_t dtime = max_t(time64_t, CONNECTION_SWITCH_MIN,
+ AT_OFF ? 0 :
+ at_get(&imp->imp_at.iat_net_latency));
+ time = min(time, dtime);
+ }
+ imp->imp_next_ping = ktime_get_seconds() + time;
+#endif /* ENABLE_PINGER */
}
-int ptlrpc_pinger_add_import(struct obd_import *imp)
+void ptlrpc_ping_import_soon(struct obd_import *imp)
{
- ENTRY;
- if (!list_empty(&imp->imp_pinger_chain))
- RETURN(-EALREADY);
-
- down(&pinger_sem);
- 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);
- /* XXX sort, blah blah */
- list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
- class_import_get(imp);
-
- ptlrpc_pinger_wake_up();
- up(&pinger_sem);
-
- RETURN(0);
+ imp->imp_next_ping = ktime_get_seconds();
}
-int ptlrpc_pinger_del_import(struct obd_import *imp)
+static inline int imp_is_deactive(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);
+ return imp->imp_deactive ||
+ OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_IMP_DEACTIVE);
}
-void ptlrpc_pinger_wake_up()
+static inline time64_t ptlrpc_next_reconnect(struct obd_import *imp)
{
-#ifdef ENABLE_PINGER
- pinger_thread->t_flags |= SVC_EVENT;
- wake_up(&pinger_thread->t_ctl_waitq);
-#endif
+ if (imp->imp_server_timeout)
+ return ktime_get_seconds() + (obd_timeout >> 1);
+ else
+ return ktime_get_seconds() + obd_timeout;
}
-#else /* !__KERNEL__ */
+static time64_t pinger_check_timeout(time64_t time)
+{
+ struct timeout_item *item;
+ time64_t timeout = PING_INTERVAL;
-/* XXX
- * the current implementation of pinger in liblustre is not optimized
- */
+ /* This list is sorted in increasing timeout order */
+ mutex_lock(&pinger_mutex);
+ list_for_each_entry(item, &timeout_list, ti_chain) {
+ time64_t ti_timeout = item->ti_timeout;
+
+ if (timeout > ti_timeout)
+ timeout = ti_timeout;
+ break;
+ }
+ mutex_unlock(&pinger_mutex);
+
+ return time + timeout - ktime_get_seconds();
+}
+
+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);
-static struct pinger_data {
- int pd_recursion;
- unsigned long pd_this_ping;
- unsigned long pd_next_ping;
- int pd_force_check;
-} pinger_args;
+void ptlrpc_pinger_ir_down(void)
+{
+ CDEBUG(D_HA, "IR down\n");
+ ir_up = false;
+}
+EXPORT_SYMBOL(ptlrpc_pinger_ir_down);
-static int pinger_check_rpcs(void *arg)
+static void ptlrpc_pinger_process_import(struct obd_import *imp,
+ time64_t this_ping)
{
- 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;
- }
-
- 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);
- }
-
- } 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);
- }
- }
- }
-
- 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--;
- return 0;
+ 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 (imp->imp_next_ping - 5 >= this_ping && !force) {
+ spin_unlock(&imp->imp_lock);
+ return;
+ }
+
+ imp->imp_force_next_verify = 0;
+
+ 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);
+ spin_unlock(&imp->imp_lock);
+ if (!imp->imp_no_pinger_recover ||
+ imp->imp_connect_error == -EAGAIN)
+ 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)
+ imp->imp_force_verify = 1;
+ spin_unlock(&imp->imp_lock);
+ } else if ((imp->imp_pingable && !suppress) || force_next || force) {
+ spin_unlock(&imp->imp_lock);
+ ptlrpc_ping(imp);
+ } else {
+ spin_unlock(&imp->imp_lock);
+ }
}
-static void *pinger_callback = NULL;
+static struct workqueue_struct *pinger_wq;
+static void ptlrpc_pinger_main(struct work_struct *ws);
+static DECLARE_DELAYED_WORK(ping_work, ptlrpc_pinger_main);
+
+static void ptlrpc_pinger_main(struct work_struct *ws)
+{
+ time64_t this_ping = ktime_get_seconds();
+ time64_t time_to_next_wake;
+ struct timeout_item *item;
+ struct obd_import *imp;
+ struct list_head *iter;
+
+ do {
+ 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) {
+ 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 &&
+ imp->imp_next_ping > this_ping + 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 %lld (%lld)\n",
+ time_to_next_wake, this_ping + PING_INTERVAL);
+ } while (time_to_next_wake <= 0);
+
+ queue_delayed_work(pinger_wq, &ping_work,
+ cfs_time_seconds(max(time_to_next_wake, 1LL)));
+}
int ptlrpc_start_pinger(void)
{
- memset(&pinger_args, 0, sizeof(pinger_args));
#ifdef ENABLE_PINGER
- pinger_callback =
- liblustre_register_wait_callback(&pinger_check_rpcs, &pinger_args);
+ if (pinger_wq)
+ return -EALREADY;
+
+ pinger_wq = alloc_workqueue("ptlrpc_pinger", 0, 1);
+ if (!pinger_wq) {
+ CERROR("cannot start pinger workqueue\n");
+ return -ENOMEM;
+ }
+
+ queue_delayed_work(pinger_wq, &ping_work, 0);
+
+ 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");
#endif
- return 0;
+ return 0;
}
+int ptlrpc_pinger_remove_timeouts(void);
+
int ptlrpc_stop_pinger(void)
{
#ifdef ENABLE_PINGER
- if (pinger_callback)
- liblustre_deregister_wait_callback(pinger_callback);
+ if (!pinger_wq)
+ return -EALREADY;
+
+ ptlrpc_pinger_remove_timeouts();
+
+ cancel_delayed_work_sync(&ping_work);
+ destroy_workqueue(pinger_wq);
+ pinger_wq = NULL;
#endif
- return 0;
+ return 0;
}
void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
{
- 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);
+ 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))
- RETURN(-EALREADY);
+ ENTRY;
+ 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)
+{
+ 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);
- 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);
+/**
+ * Register a timeout callback to the pinger list, and the callback will
+ * be called when timeout happens.
+ */
+static struct timeout_item *ptlrpc_new_timeout(time64_t time,
+ enum timeout_event event,
+ timeout_cb_t cb, void *data)
+{
+ struct timeout_item *ti;
- down(&pinger_sem);
- list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
- class_import_get(imp);
- up(&pinger_sem);
+ OBD_ALLOC_PTR(ti);
+ if (!ti)
+ return NULL;
- RETURN(0);
+ 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;
}
-int ptlrpc_pinger_del_import(struct obd_import *imp)
+/**
+ * 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(time64_t time, enum timeout_event event,
+ timeout_cb_t cb, void *data)
{
- 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 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;
}
-void ptlrpc_pinger_wake_up()
+/* Add a client_obd to the timeout event list, when timeout(@time)
+ * happens, the callback(@cb) will be called.
+ */
+int ptlrpc_add_timeout_client(time64_t time, enum timeout_event event,
+ timeout_cb_t cb, void *data,
+ struct list_head *obd_list)
{
- pinger_args.pd_force_check = 1;
+ 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, "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)
+{
+#ifdef ENABLE_PINGER
+ mod_delayed_work(pinger_wq, &ping_work, 0);
+#endif
+}
+
+/* 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;
+static 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;
+ time64_t expire_time;
+
+ ENTRY;
+ unshare_fs_struct();
+
+ CDEBUG(D_HA, "Starting Ping Evictor\n");
+ pet_state = PET_READY;
+ while (1) {
+ wait_event_idle(pet_waitq,
+ (!list_empty(&pet_list)) ||
+ (pet_state == PET_TERMINATE));
+
+ /* 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 = ktime_get_real_seconds() - PING_EVICT_TIMEOUT;
+
+ CDEBUG(D_HA, "evicting all exports of obd %s older than %lld\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) {
+ struct obd_uuid *client_uuid;
+
+ class_export_get(exp);
+ client_uuid = &exp->exp_client_uuid;
+ spin_unlock(&obd->obd_dev_lock);
+ LCONSOLE_WARN("%s: haven't heard from client %s (at %s) in %lld seconds. I think it's dead, and I am evicting it. exp %p, cur %lld expire %lld last %lld\n",
+ obd->obd_name,
+ obd_uuid2str(client_uuid),
+ obd_export_nid2str(exp),
+ ktime_get_real_seconds() -
+ exp->exp_last_request_time,
+ exp, ktime_get_real_seconds(),
+ expire_time,
+ exp->exp_last_request_time);
+ CDEBUG(D_HA, "Last request was at %lld\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);
}
-#endif /* !__KERNEL__ */
+EXPORT_SYMBOL(ping_evictor_stop);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff