* Portal-RPC reconnection and replay operations, for use in recovery.
*
* Copyright (c) 2003 Cluster File Systems, Inc.
- * Author: Phil Schwan <phil@clusterfs.com>
+ * Authors: Phil Schwan <phil@clusterfs.com>
+ * Mike Shaver <shaver@clusterfs.com>
*
* This file is part of Lustre, http://www.lustre.org.
*
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#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 "ptlrpc_internal.h"
-static struct ptlrpc_thread *pinger_thread = NULL;
-static spinlock_t pinger_lock = SPIN_LOCK_UNLOCKED;
+#define PINGER_RATE 3 /* how many pings we'll do in obd_timeout period */
+
+static DECLARE_MUTEX(pinger_sem);
static struct list_head pinger_imports = LIST_HEAD_INIT(pinger_imports);
-int ptlrpc_pinger_add_import(struct obd_import *imp)
+int ptlrpc_ping(struct obd_import *imp)
{
+ struct ptlrpc_request *req;
+ int rc = 0;
ENTRY;
- if (!list_empty(&imp->imp_pinger_chain))
- RETURN(-EALREADY);
- spin_lock(&pinger_lock);
- list_add(&imp->imp_pinger_chain, &pinger_imports);
- spin_unlock(&pinger_lock);
- RETURN(0);
+ req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, 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);
+ req->rq_timeout = obd_timeout / PINGER_RATE;
+ 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);
}
-int ptlrpc_pinger_del_import(struct obd_import *imp)
+#ifdef __KERNEL__
+static inline int ptlrpc_next_ping(struct obd_import *imp)
{
- ENTRY;
- if (list_empty(&imp->imp_pinger_chain))
- RETURN(-EALREADY);
+ return jiffies + (obd_timeout / PINGER_RATE * HZ);
+}
- spin_lock(&pinger_lock);
- list_del_init(&imp->imp_pinger_chain);
- spin_unlock(&pinger_lock);
- RETURN(0);
+static inline int ptlrpc_next_reconnect(struct obd_import *imp)
+{
+ if (imp->imp_server_timeout)
+ return jiffies + (obd_timeout / 2 * HZ);
+ else
+ return jiffies + (obd_timeout * HZ);
}
-static void ptlrpc_pinger_do_stuff(void)
+static atomic_t suspend_timeouts = ATOMIC_INIT(0);
+static wait_queue_head_t suspend_timeouts_waitq;
+
+void ptlrpc_deactivate_timeouts(void)
{
+ CDEBUG(D_HA, "deactivate timeouts\n");
+ atomic_inc(&suspend_timeouts);
+}
+
+void ptlrpc_activate_timeouts(void)
+{
+ CDEBUG(D_HA, "activate timeouts\n");
+ LASSERT(atomic_read(&suspend_timeouts) > 0);
+ if (atomic_dec_and_test(&suspend_timeouts))
+ wake_up(&suspend_timeouts_waitq);
+}
+int ptlrpc_check_suspend(void)
+{
+ if (atomic_read(&suspend_timeouts))
+ return 1;
+ return 0;
+}
+int ptlrpc_check_and_wait_suspend(struct ptlrpc_request *req)
+{
+ 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;
+}
+
+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 && 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) {
+ 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);
+ }
}
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;
- int rc = 0;
ENTRY;
lock_kernel();
RECALC_SIGPENDING;
SIGNAL_MASK_UNLOCK(current, flags);
-#if defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,20))
- sprintf(current->comm, "%s|%d", data->name,current->thread.extern_pid);
-#elif defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- sprintf(current->comm, "%s|%d", data->name,
- current->thread.mode.tt.extern_pid);
-#else
- strcpy(current->comm, data->name);
-#endif
+ 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 on requests */
+ /* And now, loop forever, pinging as needed. */
while (1) {
- struct l_wait_info lwi = LWI_TIMEOUT(5 * HZ, NULL, NULL);
- l_wait_event(thread->t_ctl_waitq,
- thread->t_flags & SVC_STOPPING, &lwi);
-
- if (thread->t_flags & SVC_STOPPING) {
- thread->t_flags &= ~SVC_STOPPING;
- EXIT;
- break;
+ 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);
+
+ 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);
+
+ 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;
+ }
}
- ptlrpc_pinger_do_stuff();
}
thread->t_flags = SVC_STOPPED;
wake_up(&thread->t_ctl_waitq);
- CDEBUG(D_NET, "pinger thread exiting, process %d: rc = %d\n",
- current->pid, rc);
- return rc;
+ CDEBUG(D_NET, "pinger thread exiting, process %d\n", current->pid);
+ return 0;
}
-int ptlrpc_pinger_start(void)
+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;
+#endif
ENTRY;
- spin_lock(&pinger_lock);
+ LASSERT(obd_timeout > PINGER_RATE);
+
if (pinger_thread != NULL)
- GOTO(out, rc = -EALREADY);
+ RETURN(-EALREADY);
OBD_ALLOC(pinger_thread, sizeof(*pinger_thread));
if (pinger_thread == NULL)
- GOTO(out, rc = -ENOMEM);
+ RETURN(-ENOMEM);
init_waitqueue_head(&pinger_thread->t_ctl_waitq);
+ init_waitqueue_head(&suspend_timeouts_waitq);
- d.name = "Lustre pinger";
+ d.name = "ll_ping";
d.thread = pinger_thread;
/* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
if (rc < 0) {
CERROR("cannot start thread: %d\n", rc);
OBD_FREE(pinger_thread, sizeof(*pinger_thread));
- GOTO(out, rc);
+ RETURN(rc);
}
l_wait_event(pinger_thread->t_ctl_waitq,
pinger_thread->t_flags & SVC_RUNNING, &lwi);
- out:
- spin_unlock(&pinger_lock);
RETURN(rc);
}
{
struct l_wait_info lwi = { 0 };
int rc = 0;
+#ifndef ENABLE_PINGER
+ return 0;
+#endif
ENTRY;
- spin_lock(&pinger_lock);
if (pinger_thread == NULL)
- GOTO(out, rc = -EALREADY);
-
+ RETURN(-EALREADY);
+ down(&pinger_sem);
pinger_thread->t_flags = SVC_STOPPING;
wake_up(&pinger_thread->t_ctl_waitq);
+ up(&pinger_sem);
+
l_wait_event(pinger_thread->t_ctl_waitq,
(pinger_thread->t_flags & SVC_STOPPED), &lwi);
OBD_FREE(pinger_thread, sizeof(*pinger_thread));
-
- out:
- spin_unlock(&pinger_lock);
+ pinger_thread = NULL;
RETURN(rc);
}
+
+void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
+{
+ down(&pinger_sem);
+ imp->imp_next_ping = ptlrpc_next_ping(imp);
+ up(&pinger_sem);
+}
+
+int ptlrpc_pinger_add_import(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);
+}
+
+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);
+}
+
+void ptlrpc_pinger_wake_up()
+{
+#ifdef ENABLE_PINGER
+ pinger_thread->t_flags |= SVC_EVENT;
+ wake_up(&pinger_thread->t_ctl_waitq);
+#endif
+}
+
+#else /* !__KERNEL__ */
+
+/* XXX
+ * the current implementation of pinger in liblustre is not optimized
+ */
+
+static struct pinger_data {
+ int pd_recursion;
+ unsigned long pd_this_ping;
+ unsigned long pd_next_ping;
+ int pd_force_check;
+} pinger_args;
+
+static int pinger_check_rpcs(void *arg)
+{
+ 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;
+}
+
+static void *pinger_callback = NULL;
+
+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);
+#endif
+ return 0;
+}
+
+int ptlrpc_stop_pinger(void)
+{
+#ifdef ENABLE_PINGER
+ if (pinger_callback)
+ liblustre_deregister_wait_callback(pinger_callback);
+#endif
+ 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);
+}
+
+int ptlrpc_pinger_add_import(struct obd_import *imp)
+{
+ 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);
+
+ RETURN(0);
+}
+
+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);
+}
+
+void ptlrpc_pinger_wake_up()
+{
+ pinger_args.pd_force_check = 1;
+}
+#endif /* !__KERNEL__ */
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