/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Portal-RPC reconnection and replay operations, for use in recovery. * * Copyright (c) 2003 Cluster File Systems, Inc. * Authors: Phil Schwan * Mike Shaver * * This file is part of Lustre, http://www.lustre.org. * * 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. * * 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. * * 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. */ #ifndef __KERNEL__ #include #else #include #include #define DEBUG_SUBSYSTEM S_RPC #endif #include #include #include "ptlrpc_internal.h" static DECLARE_MUTEX(pinger_sem); static struct list_head pinger_imports = LIST_HEAD_INIT(pinger_imports); #ifdef __KERNEL__ static struct ptlrpc_thread *pinger_thread = NULL; static int ptlrpc_pinger_main(void *arg) { struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg; struct ptlrpc_thread *thread = data->thread; unsigned long flags; ENTRY; lock_kernel(); ptlrpc_daemonize(); SIGNAL_MASK_LOCK(current, flags); sigfillset(¤t->blocked); RECALC_SIGPENDING; SIGNAL_MASK_UNLOCK(current, flags); THREAD_NAME(current->comm, "%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 ptlrpc_request_set *set; struct ptlrpc_request *req; struct list_head *iter; wait_queue_t set_wait; int rc; set = ptlrpc_prep_set(); 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; unsigned long flags; if (imp->imp_next_ping <= this_ping) { /* Add a ping. */ spin_lock_irqsave(&imp->imp_lock, flags); generation = imp->imp_generation; level = imp->imp_state; spin_unlock_irqrestore(&imp->imp_lock, flags); if (level != LUSTRE_IMP_FULL) { CDEBUG(D_HA, "not pinging %s (in recovery)\n", imp->imp_target_uuid.uuid); continue; } req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL); if (!req) { CERROR("OOM trying to ping\n"); break; } req->rq_no_resend = 1; req->rq_replen = lustre_msg_size(0, 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_HA, "don't need to ping %s (%lu > " "%lu)\n", imp->imp_target_uuid.uuid, imp->imp_next_ping, this_ping); } } up(&pinger_sem); /* Might be empty, that's OK. */ if (set->set_remaining == 0) CDEBUG(D_HA, "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_HA, req, "pinging %s->%s", req->rq_import->imp_obd->obd_uuid.uuid, req->rq_import->imp_target_uuid.uuid); (void)ptl_send_rpc(req); } /* Have to wait on both the thread's queue and the set's. */ init_waitqueue_entry(&set_wait, current); add_wait_queue(&set->set_waitq, &set_wait); rc = l_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPING || ptlrpc_check_set(set), &lwi); remove_wait_queue(&set->set_waitq, &set_wait); CDEBUG(D_HA, "ping complete (%lu)\n", jiffies); if (thread->t_flags & SVC_STOPPING) { thread->t_flags &= ~SVC_STOPPING; list_for_each(iter, &set->set_requests) { req = list_entry(iter, struct ptlrpc_request, rq_set_chain); if (!req->rq_replied) ptlrpc_unregister_reply(req); } ptlrpc_set_destroy(set); EXIT; break; } /* Expire all the requests that didn't come back. */ down(&pinger_sem); list_for_each(iter, &set->set_requests) { req = list_entry(iter, struct ptlrpc_request, rq_set_chain); if (req->rq_replied) continue; req->rq_phase = RQ_PHASE_COMPLETE; 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; } ptlrpc_expire_one_request(req); } up(&pinger_sem); ptlrpc_set_destroy(set); /* Wait until the next ping time, or until we're stopped. */ time_to_next_ping = this_ping + (obd_timeout * HZ) - jiffies; 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 ptlrpc_start_pinger(void) { 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); } 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); 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)); pinger_thread = NULL; RETURN(rc); } void ptlrpc_pinger_sending_on_import(struct obd_import *imp) { down(&pinger_sem); imp->imp_next_ping = jiffies + (obd_timeout * HZ); 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); #ifdef ENABLE_PINGER pinger_thread->t_flags |= SVC_EVENT; wake_up(&pinger_thread->t_ctl_waitq); #endif 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); } #else /* 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; struct ptlrpc_request_set *pd_set; } pinger_args; static int pinger_check_rpcs(void *arg) { unsigned long curtime = time(NULL); 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 && pd->pd_next_ping > curtime) { 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(); set = pd->pd_set; /* 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 generation, level; unsigned long flags; if (imp->imp_next_ping <= pd->pd_this_ping) { /* Add a ping. */ spin_lock_irqsave(&imp->imp_lock, flags); generation = imp->imp_generation; level = imp->imp_state; spin_unlock_irqrestore(&imp->imp_lock, flags); if (level != LUSTRE_IMP_FULL) { CDEBUG(D_HA, "not pinging %s (in recovery)\n", imp->imp_target_uuid.uuid); continue; } req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL); if (!req) { CERROR("out of memory\n"); break; } req->rq_no_resend = 1; req->rq_replen = lustre_msg_size(0, 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_HA, "don't need to ping %s (%lu > " "%lu)\n", imp->imp_target_uuid.uuid, imp->imp_next_ping, pd->pd_this_ping); } } pd->pd_this_ping = curtime; up(&pinger_sem); /* Might be empty, that's OK. */ if (set->set_remaining == 0) CDEBUG(D_HA, "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_HA, req, "pinging %s->%s", req->rq_import->imp_obd->obd_uuid.uuid, req->rq_import->imp_target_uuid.uuid); (void)ptl_send_rpc(req); } do_check_set: rc = ptlrpc_check_set(set); /* not finished, and we are not expired, simply return */ if (!rc && curtime < pd->pd_this_ping + obd_timeout) { CDEBUG(D_HA, "not finished, but also not expired\n"); pd->pd_recursion--; return 0; } /* Expire all the requests that didn't come back. */ down(&pinger_sem); list_for_each(iter, &set->set_requests) { req = list_entry(iter, struct ptlrpc_request, rq_set_chain); if (req->rq_replied) continue; req->rq_phase = RQ_PHASE_COMPLETE; 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_HA, "pinger initiate expire_one_request\n"); ptlrpc_expire_one_request(req); } up(&pinger_sem); ptlrpc_set_destroy(set); pd->pd_set = NULL; pd->pd_next_ping = pd->pd_this_ping + obd_timeout; pd->pd_this_ping = 0; /* XXX for debug */ 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 obd_timeout = 10; 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_set == NULL && 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); } #endif /* !__KERNEL__ */