-/* -*- 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.
*
- * Copyright (c) 2003 Cluster File Systems, Inc.
- * Authors: Phil Schwan <phil@clusterfs.com>
- * Mike Shaver <shaver@clusterfs.com>
+ * 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 file is part of the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * 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 may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * 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
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source 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.
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
*
- * In either case, 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
- * license text for more details.
+ * 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/ptlrpc/pinger.c
+ *
+ * Portal-RPC reconnection and replay operations, for use in recovery.
*/
-#ifndef __KERNEL__
-#include <liblustre.h>
-#else
#define DEBUG_SUBSYSTEM S_RPC
-#endif
+#include <linux/kthread.h>
+#include <linux/workqueue.h>
#include <obd_support.h>
#include <obd_class.h>
#include "ptlrpc_internal.h"
-struct semaphore pinger_sem;
-static struct list_head pinger_imports = CFS_LIST_HEAD_INIT(pinger_imports);
+static int suppress_pings;
+module_param(suppress_pings, int, 0644);
+MODULE_PARM_DESC(suppress_pings, "Suppress pings");
-int ptlrpc_ping(struct obd_import *imp)
+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_pinger_suppress_pings(void)
{
- struct ptlrpc_request *req;
- int rc = 0;
- ENTRY;
-
- req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, OBD_PING, 1, NULL, NULL);
- if (req) {
- DEBUG_REQ(D_INFO, req, "pinging %s->%s",
- imp->imp_obd->obd_uuid.uuid,
- obd2cli_tgt(imp->imp_obd));
- req->rq_no_resend = req->rq_no_delay = 1;
- ptlrpc_req_set_repsize(req, 1, NULL);
- req->rq_timeout = PING_INTERVAL;
- ptlrpcd_add_req(req);
- } else {
- CERROR("OOM trying to ping %s->%s\n",
- imp->imp_obd->obd_uuid.uuid,
- obd2cli_tgt(imp->imp_obd));
- rc = -ENOMEM;
- }
-
- RETURN(rc);
+ return suppress_pings;
}
+EXPORT_SYMBOL(ptlrpc_pinger_suppress_pings);
-void ptlrpc_update_next_ping(struct obd_import *imp)
+struct ptlrpc_request *
+ptlrpc_prep_ping(struct obd_import *imp)
{
-#ifdef ENABLE_PINGER
- imp->imp_next_ping = cfs_time_shift(
- (imp->imp_state == LUSTRE_IMP_DISCON ?
- RECONNECT_INTERVAL : PING_INTERVAL));
-#endif /* ENABLE_PINGER */
+ 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;
}
-void ptlrpc_ping_import_soon(struct obd_import *imp)
+int ptlrpc_obd_ping(struct obd_device *obd)
{
- imp->imp_next_ping = cfs_time_current();
+ int rc;
+ struct ptlrpc_request *req;
+
+ ENTRY;
+
+ 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 inline int ptlrpc_next_reconnect(struct obd_import *imp)
+static bool ptlrpc_check_import_is_idle(struct obd_import *imp)
{
- if (imp->imp_server_timeout)
- return cfs_time_shift(obd_timeout / 2);
- else
- return cfs_time_shift(obd_timeout);
+ 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;
}
-static atomic_t suspend_timeouts = ATOMIC_INIT(0);
-static cfs_time_t suspend_wakeup_time = 0;
+static int ptlrpc_ping(struct obd_import *imp)
+{
+ struct ptlrpc_request *req;
-#ifdef __KERNEL__
-static wait_queue_head_t suspend_timeouts_waitq;
-#endif
+ ENTRY;
+
+ if (ptlrpc_check_import_is_idle(imp))
+ RETURN(ptlrpc_disconnect_and_idle_import(imp));
+
+ 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);
+ }
+
+ DEBUG_REQ(D_INFO, req, "pinging %s->%s",
+ imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
+ ptlrpcd_add_req(req);
+
+ RETURN(0);
+}
+
+static void ptlrpc_update_next_ping(struct obd_import *imp, int soon)
+{
+#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 */
+}
-cfs_time_t ptlrpc_suspend_wakeup_time(void)
+void ptlrpc_ping_import_soon(struct obd_import *imp)
{
- return suspend_wakeup_time;
+ imp->imp_next_ping = ktime_get_seconds();
}
-void ptlrpc_deactivate_timeouts(struct obd_import *imp)
+static inline int imp_is_deactive(struct obd_import *imp)
{
- /*XXX: disabled for now, will be replaced by adaptive timeouts */
-#if 0
- if (imp->imp_no_timeout)
- return;
- imp->imp_no_timeout = 1;
- atomic_inc(&suspend_timeouts);
- CDEBUG(D_HA|D_WARNING, "deactivate timeouts %u\n", atomic_read(&suspend_timeouts));
-#endif
+ return imp->imp_deactive ||
+ OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_IMP_DEACTIVE);
}
-void ptlrpc_activate_timeouts(struct obd_import *imp)
+static inline time64_t ptlrpc_next_reconnect(struct obd_import *imp)
{
- /*XXX: disabled for now, will be replaced by adaptive timeouts */
-#if 0
- if (!imp->imp_no_timeout)
- return;
- imp->imp_no_timeout = 0;
- LASSERT(atomic_read(&suspend_timeouts) > 0);
- if (atomic_dec_and_test(&suspend_timeouts)) {
- suspend_wakeup_time = cfs_time_current();
- wake_up(&suspend_timeouts_waitq);
- }
- CDEBUG(D_HA|D_WARNING, "activate timeouts %u\n", atomic_read(&suspend_timeouts));
-#endif
+ if (imp->imp_server_timeout)
+ return ktime_get_seconds() + (obd_timeout >> 1);
+ else
+ return ktime_get_seconds() + obd_timeout;
}
-int ptlrpc_check_suspend(void)
+static time64_t pinger_check_timeout(time64_t time)
{
- if (atomic_read(&suspend_timeouts))
- return 1;
- return 0;
+ struct timeout_item *item;
+ time64_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) {
+ 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();
}
-int ptlrpc_check_and_wait_suspend(struct ptlrpc_request *req)
+static bool ir_up;
+
+void ptlrpc_pinger_ir_up(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 up\n");
+ ir_up = true;
}
+EXPORT_SYMBOL(ptlrpc_pinger_ir_up);
-#ifdef __KERNEL__
+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)
+ time64_t this_ping)
{
- int force, level;
-
- spin_lock(&imp->imp_lock);
- level = imp->imp_state;
- force = imp->imp_force_verify;
- if (force)
- imp->imp_force_verify = 0;
- spin_unlock(&imp->imp_lock);
-
- CDEBUG(level == LUSTRE_IMP_FULL ? D_INFO : D_HA,
- "level %s/%u force %u deactive %u pingable %u\n",
- ptlrpc_import_state_name(level), level,
- force, imp->imp_deactive, imp->imp_pingable);
-
- if (cfs_time_aftereq(imp->imp_next_ping - 5 * CFS_TICK,
- this_ping) && force == 0)
- return;
-
- if (level == LUSTRE_IMP_DISCON && !imp->imp_deactive) {
- /* wait at least a timeout 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 ||
- imp->imp_deactive) {
- CDEBUG(D_HA, "not pinging %s (in recovery "
- " or recovery disabled: %s)\n",
- obd2cli_tgt(imp->imp_obd),
- ptlrpc_import_state_name(level));
- } else if (imp->imp_pingable || force) {
- ptlrpc_ping(imp);
- }
+ 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 int ptlrpc_pinger_main(void *arg)
+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)
{
- struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
- struct ptlrpc_thread *thread = data->thread;
- ENTRY;
-
- cfs_daemonize(data->name);
-
- /* Record that the thread is running */
- thread->t_flags = SVC_RUNNING;
- cfs_waitq_signal(&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_ping;
- struct list_head *iter;
-
- mutex_down(&pinger_sem);
- 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);
- }
- mutex_up(&pinger_sem);
- /* update memory usage info */
- obd_update_maxusage();
-
- /* Wait until the next ping time, or until we're stopped. */
- time_to_next_ping = cfs_time_sub(cfs_time_add(this_ping,
- cfs_time_seconds(PING_INTERVAL)),
- cfs_time_current());
-
- /* The ping sent by ptlrpc_send_rpc may get sent out
- say .01 second after this.
- ptlrpc_pinger_eending_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 ping in "CFS_DURATION_T" ("CFS_TIME_T")\n",
- time_to_next_ping,
- cfs_time_add(this_ping, cfs_time_seconds(PING_INTERVAL)));
- if (time_to_next_ping > 0) {
- lwi = LWI_TIMEOUT(max_t(cfs_duration_t, time_to_next_ping, cfs_time_seconds(1)),
- 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;
- cfs_waitq_signal(&thread->t_ctl_waitq);
-
- CDEBUG(D_NET, "pinger thread exiting, process %d\n", cfs_curproc_pid());
- return 0;
+ 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)));
}
-static struct ptlrpc_thread *pinger_thread = NULL;
-
int ptlrpc_start_pinger(void)
{
- struct l_wait_info lwi = { 0 };
- struct ptlrpc_svc_data d;
- int rc;
-#ifndef ENABLE_PINGER
- return 0;
+#ifdef ENABLE_PINGER
+ 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
- ENTRY;
-
- if (pinger_thread != NULL)
- RETURN(-EALREADY);
-
- OBD_ALLOC_PTR(pinger_thread);
- if (pinger_thread == NULL)
- RETURN(-ENOMEM);
- cfs_waitq_init(&pinger_thread->t_ctl_waitq);
- cfs_waitq_init(&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 = cfs_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));
- pinger_thread = NULL;
- RETURN(rc);
- }
- l_wait_event(pinger_thread->t_ctl_waitq,
- pinger_thread->t_flags & SVC_RUNNING, &lwi);
-
- RETURN(0);
+ return 0;
}
+int ptlrpc_pinger_remove_timeouts(void);
+
int ptlrpc_stop_pinger(void)
{
- struct l_wait_info lwi = { 0 };
- int rc = 0;
-#ifndef ENABLE_PINGER
- return 0;
-#endif
- ENTRY;
-
- if (pinger_thread == NULL)
- RETURN(-EALREADY);
- mutex_down(&pinger_sem);
- pinger_thread->t_flags = SVC_STOPPING;
- cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
- mutex_up(&pinger_sem);
+#ifdef ENABLE_PINGER
+ if (!pinger_wq)
+ return -EALREADY;
- l_wait_event(pinger_thread->t_ctl_waitq,
- (pinger_thread->t_flags & SVC_STOPPED), &lwi);
+ ptlrpc_pinger_remove_timeouts();
- OBD_FREE_PTR(pinger_thread);
- pinger_thread = NULL;
- RETURN(rc);
+ cancel_delayed_work_sync(&ping_work);
+ destroy_workqueue(pinger_wq);
+ pinger_wq = NULL;
+#endif
+ return 0;
}
void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
{
- ptlrpc_update_next_ping(imp);
+ 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);
-
- mutex_down(&pinger_sem);
- 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);
- /* XXX sort, blah blah */
- list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
- class_import_get(imp);
-
- ptlrpc_pinger_wake_up();
- mutex_up(&pinger_sem);
-
- RETURN(0);
+ 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_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, 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_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(time64_t time,
+ enum timeout_event event,
+ timeout_cb_t cb, void *data)
{
-#ifdef ENABLE_PINGER
- pinger_thread->t_flags |= SVC_EVENT;
- cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
-#endif
-}
+ struct timeout_item *ti;
-/* Ping evictor thread */
-#define PET_READY 1
-#define PET_TERMINATE 2
+ OBD_ALLOC_PTR(ti);
+ if (!ti)
+ return NULL;
-static int pet_refcount = 0;
-static int pet_state;
-static wait_queue_head_t pet_waitq;
-static struct obd_export *pet_exp = NULL;
-static spinlock_t pet_lock = SPIN_LOCK_UNLOCKED;
+ 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;
-int ping_evictor_wake(struct obd_export *exp)
-{
- spin_lock(&pet_lock);
- if (pet_exp || (pet_state != PET_READY)) {
- /* eventually the new obd will call here again. */
- spin_unlock(&pet_lock);
- return 1;
- }
-
- /* We have to make sure the obd isn't destroyed between now and when
- * the ping evictor runs. We'll take a reference here, and drop it
- * when we finish in the evictor. We don't really care about this
- * export in particular; we just need one to keep the obd alive. */
- pet_exp = class_export_get(exp);
- spin_unlock(&pet_lock);
-
- wake_up(&pet_waitq);
- return 0;
+ return ti;
}
-static int ping_evictor_main(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(time64_t time, enum timeout_event event,
+ timeout_cb_t cb, void *data)
{
- struct obd_device *obd;
- struct obd_export *exp;
- struct l_wait_info lwi = { 0 };
- time_t expire_time;
- ENTRY;
-
- ptlrpc_daemonize("ll_evictor");
-
- CDEBUG(D_HA, "Starting Ping Evictor\n");
- pet_exp = NULL;
- pet_state = PET_READY;
- while (1) {
- l_wait_event(pet_waitq, pet_exp ||
- (pet_state == PET_TERMINATE), &lwi);
- if (pet_state == PET_TERMINATE)
- 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 = pet_exp->exp_obd;
- spin_unlock(&pet_lock);
-
- expire_time = CURRENT_SECONDS - (3 * obd_timeout / 2);
-
- 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)(CURRENT_SECONDS -
- exp->exp_last_request_time),
- exp, (long)CURRENT_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);
-
- class_export_put(pet_exp);
-
- spin_lock(&pet_lock);
- pet_exp = NULL;
- spin_unlock(&pet_lock);
- }
- CDEBUG(D_HA, "Exiting Ping Evictor\n");
-
- 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 ping_evictor_start(void)
+/* 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)
{
- int rc;
-
- if (++pet_refcount > 1)
- return;
-
- init_waitqueue_head(&pet_waitq);
-
- rc = cfs_kernel_thread(ping_evictor_main, NULL, CLONE_VM | CLONE_FILES);
- if (rc < 0) {
- pet_refcount--;
- CERROR("Cannot start ping evictor thread: %d\n", rc);
- }
+ 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(ping_evictor_start);
+EXPORT_SYMBOL(ptlrpc_add_timeout_client);
-void ping_evictor_stop(void)
+int ptlrpc_del_timeout_client(struct list_head *obd_list,
+ enum timeout_event event)
{
- if (--pet_refcount > 0)
- return;
-
- pet_state = PET_TERMINATE;
- wake_up(&pet_waitq);
+ 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(ping_evictor_stop);
-#else /* !__KERNEL__ */
+EXPORT_SYMBOL(ptlrpc_del_timeout_client);
-/* XXX
- * the current implementation of pinger in liblustre is not optimized
- */
-
-#ifdef ENABLE_PINGER
-static struct pinger_data {
- int pd_recursion;
- cfs_time_t pd_this_ping; /* jiffies */
- cfs_time_t pd_next_ping; /* jiffies */
- struct ptlrpc_request_set *pd_set;
-} pinger_args;
-
-static int pinger_check_rpcs(void *arg)
+int ptlrpc_pinger_remove_timeouts(void)
{
- cfs_time_t curtime = cfs_time_current();
- struct ptlrpc_request *req;
- struct ptlrpc_request_set *set;
- struct list_head *iter;
- struct pinger_data *pd = &pinger_args;
- int rc;
-
- /* prevent recursion */
- if (pd->pd_recursion++) {
- CDEBUG(D_HA, "pinger: recursion! quit\n");
- LASSERT(pd->pd_set);
- pd->pd_recursion--;
- return 0;
- }
-
- /* have we reached ping point? */
- if (!pd->pd_set && time_before(curtime, pd->pd_next_ping)) {
- pd->pd_recursion--;
- return 0;
- }
-
- /* if we have rpc_set already, continue processing it */
- if (pd->pd_set) {
- LASSERT(pd->pd_this_ping);
- set = pd->pd_set;
- goto do_check_set;
- }
-
- pd->pd_this_ping = curtime;
- pd->pd_set = ptlrpc_prep_set();
- if (pd->pd_set == NULL)
- goto out;
- set = pd->pd_set;
-
- /* add rpcs into set */
- mutex_down(&pinger_sem);
- list_for_each(iter, &pinger_imports) {
- struct obd_import *imp =
- list_entry(iter, struct obd_import, imp_pinger_chain);
- int generation, level;
-
- if (cfs_time_aftereq(pd->pd_this_ping,
- imp->imp_next_ping - 5 * CFS_TICK)) {
- /* Add a ping. */
- spin_lock(&imp->imp_lock);
- generation = imp->imp_generation;
- level = imp->imp_state;
- spin_unlock(&imp->imp_lock);
-
- if (level != LUSTRE_IMP_FULL) {
- CDEBUG(D_HA,
- "not pinging %s (in recovery)\n",
- obd2cli_tgt(imp->imp_obd));
- continue;
- }
-
- req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, OBD_PING,
- 1, NULL, NULL);
- if (!req) {
- CERROR("out of memory\n");
- break;
- }
- req->rq_no_resend = 1;
- ptlrpc_req_set_repsize(req, 1, NULL);
- req->rq_send_state = LUSTRE_IMP_FULL;
- req->rq_phase = RQ_PHASE_RPC;
- req->rq_import_generation = generation;
- ptlrpc_set_add_req(set, req);
- } else {
- CDEBUG(D_INFO, "don't need to ping %s ("CFS_TIME_T
- " > "CFS_TIME_T")\n", obd2cli_tgt(imp->imp_obd),
- imp->imp_next_ping, pd->pd_this_ping);
- }
- }
- pd->pd_this_ping = curtime;
- mutex_up(&pinger_sem);
-
- /* Might be empty, that's OK. */
- if (set->set_remaining == 0)
- CDEBUG(D_RPCTRACE, "nothing to ping\n");
-
- list_for_each(iter, &set->set_requests) {
- struct ptlrpc_request *req =
- list_entry(iter, struct ptlrpc_request,
- rq_set_chain);
- DEBUG_REQ(D_RPCTRACE, req, "pinging %s->%s",
- req->rq_import->imp_obd->obd_uuid.uuid,
- obd2cli_tgt(req->rq_import->imp_obd));
- (void)ptl_send_rpc(req, 0);
- }
-
-do_check_set:
- rc = ptlrpc_check_set(set);
-
- /* not finished, and we are not expired, simply return */
- if (!rc && cfs_time_before(curtime, cfs_time_add(pd->pd_this_ping,
- cfs_time_seconds(PING_INTERVAL)))) {
- CDEBUG(D_RPCTRACE, "not finished, but also not expired\n");
- pd->pd_recursion--;
- return 0;
- }
-
- /* Expire all the requests that didn't come back. */
- mutex_down(&pinger_sem);
- list_for_each(iter, &set->set_requests) {
- req = list_entry(iter, struct ptlrpc_request,
- rq_set_chain);
-
- if (req->rq_phase == RQ_PHASE_COMPLETE)
- continue;
-
- req->rq_phase = RQ_PHASE_COMPLETE;
- atomic_dec(&req->rq_import->imp_inflight);
- set->set_remaining--;
- /* If it was disconnected, don't sweat it. */
- if (list_empty(&req->rq_import->imp_pinger_chain)) {
- ptlrpc_unregister_reply(req);
- continue;
- }
-
- CDEBUG(D_RPCTRACE, "pinger initiate expire_one_request\n");
- ptlrpc_expire_one_request(req);
- }
- mutex_up(&pinger_sem);
-
- ptlrpc_set_destroy(set);
- pd->pd_set = NULL;
-
-out:
- pd->pd_next_ping = cfs_time_add(pd->pd_this_ping,
- cfs_time_seconds(PING_INTERVAL));
- pd->pd_this_ping = 0; /* XXX for debug */
-
- CDEBUG(D_INFO, "finished a round ping\n");
- pd->pd_recursion--;
- return 0;
+ 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;
}
-static void *pinger_callback = NULL;
-#endif /* ENABLE_PINGER */
-
-int ptlrpc_start_pinger(void)
+void ptlrpc_pinger_wake_up(void)
{
#ifdef ENABLE_PINGER
- memset(&pinger_args, 0, sizeof(pinger_args));
- pinger_callback = liblustre_register_wait_callback("pinger_check_rpcs",
- &pinger_check_rpcs,
- &pinger_args);
+ mod_delayed_work(pinger_wq, &ping_work, 0);
#endif
- return 0;
}
-int ptlrpc_stop_pinger(void)
+/* 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)
{
-#ifdef ENABLE_PINGER
- if (pinger_callback)
- liblustre_deregister_wait_callback(pinger_callback);
-#endif
- return 0;
+ 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;
}
-void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
+static int ping_evictor_main(void *arg)
{
-#ifdef ENABLE_PINGER
- mutex_down(&pinger_sem);
- ptlrpc_update_next_ping(imp);
- if (pinger_args.pd_set == NULL &&
- time_before(imp->imp_next_ping, pinger_args.pd_next_ping)) {
- CDEBUG(D_HA, "set next ping to "CFS_TIME_T"(cur "CFS_TIME_T")\n",
- imp->imp_next_ping, cfs_time_current());
- pinger_args.pd_next_ping = imp->imp_next_ping;
- }
- mutex_up(&pinger_sem);
-#endif
+ 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);
}
-int ptlrpc_pinger_add_import(struct obd_import *imp)
+void ping_evictor_start(void)
{
- ENTRY;
- if (!list_empty(&imp->imp_pinger_chain))
- RETURN(-EALREADY);
+ struct task_struct *task;
- CDEBUG(D_HA, "adding pingable import %s->%s\n",
- imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
- ptlrpc_pinger_sending_on_import(imp);
+ if (++pet_refcount > 1)
+ return;
- mutex_down(&pinger_sem);
- list_add_tail(&imp->imp_pinger_chain, &pinger_imports);
- class_import_get(imp);
- mutex_up(&pinger_sem);
+ init_waitqueue_head(&pet_waitq);
- RETURN(0);
+ 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);
-int ptlrpc_pinger_del_import(struct obd_import *imp)
+void ping_evictor_stop(void)
{
- ENTRY;
- if (list_empty(&imp->imp_pinger_chain))
- RETURN(-ENOENT);
-
- mutex_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, obd2cli_tgt(imp->imp_obd));
- class_import_put(imp);
- mutex_up(&pinger_sem);
- RETURN(0);
-}
+ if (--pet_refcount > 0)
+ return;
-void ptlrpc_pinger_wake_up()
-{
-#ifdef ENABLE_PINGER
- /* XXX force pinger to run, if needed */
- struct obd_import *imp;
- ENTRY;
- list_for_each_entry(imp, &pinger_imports, imp_pinger_chain) {
- CDEBUG(D_RPCTRACE, "checking import %s->%s\n",
- imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd));
-#ifdef ENABLE_LIBLUSTRE_RECOVERY
- if (imp->imp_state == LUSTRE_IMP_DISCON && !imp->imp_deactive)
-#else
- /*XXX only recover for the initial connection */
- if (!lustre_handle_is_used(&imp->imp_remote_handle) &&
- imp->imp_state == LUSTRE_IMP_DISCON && !imp->imp_deactive)
-#endif
- ptlrpc_initiate_recovery(imp);
- else if (imp->imp_state != LUSTRE_IMP_FULL)
- CDEBUG(D_HA, "Refused to recover import %s->%s "
- "state %d, deactive %d\n",
- imp->imp_obd->obd_uuid.uuid,
- obd2cli_tgt(imp->imp_obd), imp->imp_state,
- imp->imp_deactive);
- }
- EXIT;
-#endif
+ pet_state = PET_TERMINATE;
+ wake_up(&pet_waitq);
}
-#endif /* !__KERNEL__ */
+EXPORT_SYMBOL(ping_evictor_stop);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff