/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Copyright (C) 2002 Cluster File Systems, Inc.
+ * GPL HEADER START
*
- * This file is part of Lustre, http://www.lustre.org.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * 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.
+ * 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.
*
- * 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.
+ * 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
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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 2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*/
#define DEBUG_SUBSYSTEM S_RPC
+#ifndef __KERNEL__
+#include <liblustre.h>
+#endif
+#include <obd_support.h>
+#include <obd_class.h>
+#include <lustre_net.h>
+#include <lu_object.h>
+#include <lnet/types.h>
+#include "ptlrpc_internal.h"
+
+/* The following are visible and mutable through /sys/module/ptlrpc */
+int test_req_buffer_pressure = 0;
+CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
+ "set non-zero to put pressure on request buffer pools");
+unsigned int at_min = 0;
+CFS_MODULE_PARM(at_min, "i", int, 0644,
+ "Adaptive timeout minimum (sec)");
+unsigned int at_max = 600;
+EXPORT_SYMBOL(at_max);
+CFS_MODULE_PARM(at_max, "i", int, 0644,
+ "Adaptive timeout maximum (sec)");
+unsigned int at_history = 600;
+CFS_MODULE_PARM(at_history, "i", int, 0644,
+ "Adaptive timeouts remember the slowest event that took place "
+ "within this period (sec)");
+static int at_early_margin = 5;
+CFS_MODULE_PARM(at_early_margin, "i", int, 0644,
+ "How soon before an RPC deadline to send an early reply");
+static int at_extra = 30;
+CFS_MODULE_PARM(at_extra, "i", int, 0644,
+ "How much extra time to give with each early reply");
+
+
+/* forward ref */
+static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc);
+
+static CFS_LIST_HEAD(ptlrpc_all_services);
+spinlock_t ptlrpc_all_services_lock;
+
+static char *
+ptlrpc_alloc_request_buffer (int size)
+{
+ char *ptr;
-#include <linux/obd_support.h>
-#include <linux/obd_class.h>
-#include <linux/lustre_net.h>
+ if (size > SVC_BUF_VMALLOC_THRESHOLD)
+ OBD_VMALLOC(ptr, size);
+ else
+ OBD_ALLOC(ptr, size);
-extern int request_in_callback(ptl_event_t *ev);
+ return (ptr);
+}
-static int ptlrpc_check_event(struct ptlrpc_service *svc,
- struct ptlrpc_thread *thread, ptl_event_t *event)
+static void
+ptlrpc_free_request_buffer (char *ptr, int size)
{
- int rc;
- ENTRY;
+ if (size > SVC_BUF_VMALLOC_THRESHOLD)
+ OBD_VFREE(ptr, size);
+ else
+ OBD_FREE(ptr, size);
+}
+
+struct ptlrpc_request_buffer_desc *
+ptlrpc_alloc_rqbd (struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request_buffer_desc *rqbd;
+
+ OBD_ALLOC_PTR(rqbd);
+ if (rqbd == NULL)
+ return (NULL);
+
+ rqbd->rqbd_service = svc;
+ rqbd->rqbd_refcount = 0;
+ rqbd->rqbd_cbid.cbid_fn = request_in_callback;
+ rqbd->rqbd_cbid.cbid_arg = rqbd;
+ CFS_INIT_LIST_HEAD(&rqbd->rqbd_reqs);
+ rqbd->rqbd_buffer = ptlrpc_alloc_request_buffer(svc->srv_buf_size);
+
+ if (rqbd->rqbd_buffer == NULL) {
+ OBD_FREE_PTR(rqbd);
+ return (NULL);
+ }
+
+ spin_lock(&svc->srv_lock);
+ list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
+ svc->srv_nbufs++;
+ spin_unlock(&svc->srv_lock);
+
+ return (rqbd);
+}
+
+void
+ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
+{
+ struct ptlrpc_service *svc = rqbd->rqbd_service;
+
+ LASSERT (rqbd->rqbd_refcount == 0);
+ LASSERT (list_empty(&rqbd->rqbd_reqs));
spin_lock(&svc->srv_lock);
+ list_del(&rqbd->rqbd_list);
+ svc->srv_nbufs--;
+ spin_unlock(&svc->srv_lock);
- if (thread->t_flags & SVC_STOPPING)
- GOTO(out, rc = 1);
+ ptlrpc_free_request_buffer (rqbd->rqbd_buffer, svc->srv_buf_size);
+ OBD_FREE_PTR(rqbd);
+}
- LASSERT ((thread->t_flags & SVC_EVENT) == 0);
- LASSERT (ptl_is_valid_handle (&svc->srv_eq_h));
+int
+ptlrpc_grow_req_bufs(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request_buffer_desc *rqbd;
+ int i;
+
+ CDEBUG(D_RPCTRACE, "%s: allocate %d new %d-byte reqbufs (%d/%d left)\n",
+ svc->srv_name, svc->srv_nbuf_per_group, svc->srv_buf_size,
+ svc->srv_nrqbd_receiving, svc->srv_nbufs);
+ for (i = 0; i < svc->srv_nbuf_per_group; i++) {
+ rqbd = ptlrpc_alloc_rqbd(svc);
+
+ if (rqbd == NULL) {
+ CERROR ("%s: Can't allocate request buffer\n",
+ svc->srv_name);
+ return (-ENOMEM);
+ }
- rc = PtlEQGet(svc->srv_eq_h, event);
- switch (rc)
- {
- case PTL_OK:
- thread->t_flags |= SVC_EVENT;
- GOTO(out, rc = 1);
-
- case PTL_EQ_EMPTY:
- GOTO(out, rc = 0);
-
- default:
- CERROR("BUG: PtlEQGet returned %d\n", rc);
- LBUG();
+ if (ptlrpc_server_post_idle_rqbds(svc) < 0)
+ return (-EAGAIN);
+ }
+
+ return (0);
+}
+
+void
+ptlrpc_save_lock (struct ptlrpc_request *req,
+ struct lustre_handle *lock, int mode, int no_ack)
+{
+ struct ptlrpc_reply_state *rs = req->rq_reply_state;
+ int idx;
+
+ LASSERT(rs != NULL);
+ LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
+
+ idx = rs->rs_nlocks++;
+ rs->rs_locks[idx] = *lock;
+ rs->rs_modes[idx] = mode;
+ rs->rs_difficult = 1;
+ rs->rs_no_ack = !!no_ack;
+}
+
+void
+ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
+{
+ struct ptlrpc_service *svc = rs->rs_service;
+ ENTRY;
+
+#ifdef CONFIG_SMP
+ LASSERT (spin_is_locked (&svc->srv_lock));
+#endif
+ LASSERT (rs->rs_difficult);
+ rs->rs_scheduled_ever = 1; /* flag any notification attempt */
+
+ if (rs->rs_scheduled) { /* being set up or already notified */
+ EXIT;
+ return;
+ }
+
+ rs->rs_scheduled = 1;
+ list_del (&rs->rs_list);
+ list_add (&rs->rs_list, &svc->srv_reply_queue);
+ cfs_waitq_signal (&svc->srv_waitq);
+ EXIT;
+}
+
+void
+ptlrpc_commit_replies (struct obd_device *obd)
+{
+ struct list_head *tmp;
+ struct list_head *nxt;
+ ENTRY;
+
+ /* Find any replies that have been committed and get their service
+ * to attend to complete them. */
+
+ /* CAVEAT EMPTOR: spinlock ordering!!! */
+ spin_lock(&obd->obd_uncommitted_replies_lock);
+
+ list_for_each_safe (tmp, nxt, &obd->obd_uncommitted_replies) {
+ struct ptlrpc_reply_state *rs =
+ list_entry(tmp, struct ptlrpc_reply_state, rs_obd_list);
+
+ LASSERT (rs->rs_difficult);
+
+ if (rs->rs_transno <= obd->obd_last_committed) {
+ struct ptlrpc_service *svc = rs->rs_service;
+
+ spin_lock (&svc->srv_lock);
+ list_del_init (&rs->rs_obd_list);
+ ptlrpc_schedule_difficult_reply (rs);
+ spin_unlock (&svc->srv_lock);
+ }
+ }
+
+ spin_unlock(&obd->obd_uncommitted_replies_lock);
+ EXIT;
+}
+
+static int
+ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request_buffer_desc *rqbd;
+ int rc;
+ int posted = 0;
+
+ for (;;) {
+ spin_lock(&svc->srv_lock);
+
+ if (list_empty (&svc->srv_idle_rqbds)) {
+ spin_unlock(&svc->srv_lock);
+ return (posted);
+ }
+
+ rqbd = list_entry(svc->srv_idle_rqbds.next,
+ struct ptlrpc_request_buffer_desc,
+ rqbd_list);
+ list_del (&rqbd->rqbd_list);
+
+ /* assume we will post successfully */
+ svc->srv_nrqbd_receiving++;
+ list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds);
+
+ spin_unlock(&svc->srv_lock);
+
+ rc = ptlrpc_register_rqbd(rqbd);
+ if (rc != 0)
+ break;
+
+ posted = 1;
}
- out:
+
+ spin_lock(&svc->srv_lock);
+
+ svc->srv_nrqbd_receiving--;
+ list_del(&rqbd->rqbd_list);
+ list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
+
+ /* Don't complain if no request buffers are posted right now; LNET
+ * won't drop requests because we set the portal lazy! */
+
spin_unlock(&svc->srv_lock);
- return rc;
+
+ return (-1);
+}
+
+struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c,
+ svc_handler_t h, char *name,
+ struct proc_dir_entry *proc_entry,
+ svcreq_printfn_t prntfn,
+ char *threadname)
+{
+ return ptlrpc_init_svc(c->psc_nbufs, c->psc_bufsize,
+ c->psc_max_req_size, c->psc_max_reply_size,
+ c->psc_req_portal, c->psc_rep_portal,
+ c->psc_watchdog_factor,
+ h, name, proc_entry,
+ prntfn, c->psc_min_threads, c->psc_max_threads,
+ threadname, c->psc_ctx_tags);
}
+EXPORT_SYMBOL(ptlrpc_init_svc_conf);
+static void ptlrpc_at_timer(unsigned long castmeharder)
+{
+ struct ptlrpc_service *svc = (struct ptlrpc_service *)castmeharder;
+ svc->srv_at_check = 1;
+ svc->srv_at_checktime = cfs_time_current();
+ cfs_waitq_signal(&svc->srv_waitq);
+}
+
+/* @threadname should be 11 characters or less - 3 will be added on */
struct ptlrpc_service *
-ptlrpc_init_svc(__u32 nevents, __u32 nbufs,
- __u32 bufsize, __u32 max_req_size,
- int req_portal, int rep_portal,
- obd_uuid_t uuid, svc_handler_t handler, char *name)
+ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, int max_reply_size,
+ int req_portal, int rep_portal, int watchdog_factor,
+ svc_handler_t handler, char *name,
+ cfs_proc_dir_entry_t *proc_entry,
+ svcreq_printfn_t svcreq_printfn,
+ int min_threads, int max_threads,
+ char *threadname, __u32 ctx_tags)
{
- int err;
- int rc, i;
+ int rc;
struct ptlrpc_service *service;
ENTRY;
- OBD_ALLOC(service, sizeof(*service));
- if (!service)
+ LASSERT (nbufs > 0);
+ LASSERT (bufsize >= max_req_size + SPTLRPC_MAX_PAYLOAD);
+ LASSERT (ctx_tags != 0);
+
+ OBD_ALLOC_PTR(service);
+ if (service == NULL)
RETURN(NULL);
+ /* First initialise enough for early teardown */
+
service->srv_name = name;
spin_lock_init(&service->srv_lock);
- INIT_LIST_HEAD(&service->srv_threads);
- init_waitqueue_head(&service->srv_waitq);
+ CFS_INIT_LIST_HEAD(&service->srv_threads);
+ cfs_waitq_init(&service->srv_waitq);
- service->srv_max_req_size = max_req_size;
+ service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 : nbufs;
+ service->srv_max_req_size = max_req_size + SPTLRPC_MAX_PAYLOAD;
service->srv_buf_size = bufsize;
- INIT_LIST_HEAD(&service->srv_rqbds);
- service->srv_nrqbds = 0;
- atomic_set(&service->srv_nrqbds_receiving, 0);
-
service->srv_rep_portal = rep_portal;
service->srv_req_portal = req_portal;
+ service->srv_watchdog_factor = watchdog_factor;
service->srv_handler = handler;
+ service->srv_request_history_print_fn = svcreq_printfn;
+ service->srv_request_seq = 1; /* valid seq #s start at 1 */
+ service->srv_request_max_cull_seq = 0;
+ service->srv_threads_min = min_threads;
+ service->srv_threads_max = max_threads;
+ service->srv_thread_name = threadname;
+ service->srv_ctx_tags = ctx_tags;
+
+ rc = LNetSetLazyPortal(service->srv_req_portal);
+ LASSERT (rc == 0);
+
+ CFS_INIT_LIST_HEAD(&service->srv_request_queue);
+ CFS_INIT_LIST_HEAD(&service->srv_idle_rqbds);
+ CFS_INIT_LIST_HEAD(&service->srv_active_rqbds);
+ CFS_INIT_LIST_HEAD(&service->srv_history_rqbds);
+ CFS_INIT_LIST_HEAD(&service->srv_request_history);
+ CFS_INIT_LIST_HEAD(&service->srv_active_replies);
+ CFS_INIT_LIST_HEAD(&service->srv_reply_queue);
+ CFS_INIT_LIST_HEAD(&service->srv_free_rs_list);
+ cfs_waitq_init(&service->srv_free_rs_waitq);
+
+ spin_lock_init(&service->srv_at_lock);
+ CFS_INIT_LIST_HEAD(&service->srv_req_in_queue);
+ CFS_INIT_LIST_HEAD(&service->srv_at_list);
+ cfs_timer_init(&service->srv_at_timer, ptlrpc_at_timer, service);
+ /* At SOW, service time should be quick; 10s seems generous. If client
+ timeout is less than this, we'll be sending an early reply. */
+ at_init(&service->srv_at_estimate, 10, 0);
+
+ spin_lock (&ptlrpc_all_services_lock);
+ list_add (&service->srv_list, &ptlrpc_all_services);
+ spin_unlock (&ptlrpc_all_services_lock);
+
+ /* Now allocate the request buffers */
+ rc = ptlrpc_grow_req_bufs(service);
+ /* We shouldn't be under memory pressure at startup, so
+ * fail if we can't post all our buffers at this time. */
+ if (rc != 0)
+ GOTO(failed, NULL);
+
+ /* Now allocate pool of reply buffers */
+ /* Increase max reply size to next power of two */
+ service->srv_max_reply_size = 1;
+ while (service->srv_max_reply_size <
+ max_reply_size + SPTLRPC_MAX_PAYLOAD)
+ service->srv_max_reply_size <<= 1;
+
+ if (proc_entry != NULL)
+ ptlrpc_lprocfs_register_service(proc_entry, service);
+
+ CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
+ service->srv_name, service->srv_req_portal);
- err = kportal_uuid_to_peer(uuid, &service->srv_self);
- if (err) {
- CERROR("%s: cannot get peer for uuid '%s'\n", name, uuid);
- OBD_FREE(service, sizeof(*service));
- RETURN(NULL);
+ RETURN(service);
+failed:
+ ptlrpc_unregister_service(service);
+ return NULL;
+}
+
+/**
+ * to actually free the request, must be called without holding svc_lock.
+ * note it's caller's responsibility to unlink req->rq_list.
+ */
+static void ptlrpc_server_free_request(struct ptlrpc_request *req)
+{
+ LASSERT(atomic_read(&req->rq_refcount) == 0);
+ LASSERT(list_empty(&req->rq_timed_list));
+
+ /* DEBUG_REQ() assumes the reply state of a request with a valid
+ * ref will not be destroyed until that reference is dropped. */
+ ptlrpc_req_drop_rs(req);
+
+ sptlrpc_svc_ctx_decref(req);
+
+ if (req != &req->rq_rqbd->rqbd_req) {
+ /* NB request buffers use an embedded
+ * req if the incoming req unlinked the
+ * MD; this isn't one of them! */
+ OBD_FREE(req, sizeof(*req));
}
+}
- rc = PtlEQAlloc(service->srv_self.peer_ni, nevents,
- request_in_callback, &(service->srv_eq_h));
+/**
+ * drop a reference count of the request. if it reaches 0, we either
+ * put it into history list, or free it immediately.
+ */
+static void ptlrpc_server_drop_request(struct ptlrpc_request *req)
+{
+ struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
+ struct ptlrpc_service *svc = rqbd->rqbd_service;
+ int refcount;
+ struct list_head *tmp;
+ struct list_head *nxt;
- if (rc != PTL_OK) {
- CERROR("%s: PtlEQAlloc failed: %d\n", name, rc);
- OBD_FREE(service, sizeof(*service));
- RETURN(NULL);
+ if (!atomic_dec_and_test(&req->rq_refcount))
+ return;
+
+ spin_lock(&svc->srv_lock);
+
+ svc->srv_n_active_reqs--;
+ list_add(&req->rq_list, &rqbd->rqbd_reqs);
+
+ refcount = --(rqbd->rqbd_refcount);
+ if (refcount == 0) {
+ /* request buffer is now idle: add to history */
+ list_del(&rqbd->rqbd_list);
+ list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
+ svc->srv_n_history_rqbds++;
+
+ /* cull some history?
+ * I expect only about 1 or 2 rqbds need to be recycled here */
+ while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
+ rqbd = list_entry(svc->srv_history_rqbds.next,
+ struct ptlrpc_request_buffer_desc,
+ rqbd_list);
+
+ list_del(&rqbd->rqbd_list);
+ svc->srv_n_history_rqbds--;
+
+ /* remove rqbd's reqs from svc's req history while
+ * I've got the service lock */
+ list_for_each(tmp, &rqbd->rqbd_reqs) {
+ req = list_entry(tmp, struct ptlrpc_request,
+ rq_list);
+ /* Track the highest culled req seq */
+ if (req->rq_history_seq >
+ svc->srv_request_max_cull_seq)
+ svc->srv_request_max_cull_seq =
+ req->rq_history_seq;
+ list_del(&req->rq_history_list);
+ }
+
+ spin_unlock(&svc->srv_lock);
+
+ list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
+ req = list_entry(rqbd->rqbd_reqs.next,
+ struct ptlrpc_request,
+ rq_list);
+ list_del(&req->rq_list);
+ ptlrpc_server_free_request(req);
+ }
+
+ spin_lock(&svc->srv_lock);
+ /*
+ * now all reqs including the embedded req has been
+ * disposed, schedule request buffer for re-use.
+ */
+ LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
+ list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
+ }
+
+ spin_unlock(&svc->srv_lock);
+ } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
+ /* If we are low on memory, we are not interested in history */
+ list_del(&req->rq_list);
+ list_del_init(&req->rq_history_list);
+ spin_unlock(&svc->srv_lock);
+
+ ptlrpc_server_free_request(req);
+ } else {
+ spin_unlock(&svc->srv_lock);
}
+}
+
+/**
+ * to finish a request: stop sending more early replies, and release
+ * the request. should be called after we finished handling the request.
+ */
+static void ptlrpc_server_finish_request(struct ptlrpc_request *req)
+{
+ struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
+
+ if (req->rq_phase != RQ_PHASE_NEW) /* incorrect message magic */
+ DEBUG_REQ(D_INFO, req, "free req");
+
+ spin_lock(&svc->srv_at_lock);
+ req->rq_sent_final = 1;
+ list_del_init(&req->rq_timed_list);
+ spin_unlock(&svc->srv_at_lock);
+
+ ptlrpc_server_drop_request(req);
+}
+
+/* This function makes sure dead exports are evicted in a timely manner.
+ This function is only called when some export receives a message (i.e.,
+ the network is up.) */
+static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
+{
+ struct obd_export *oldest_exp;
+ time_t oldest_time;
+
+ ENTRY;
+
+ LASSERT(exp);
+
+ /* Compensate for slow machines, etc, by faking our request time
+ into the future. Although this can break the strict time-ordering
+ of the list, we can be really lazy here - we don't have to evict
+ at the exact right moment. Eventually, all silent exports
+ will make it to the top of the list. */
+ exp->exp_last_request_time = max(exp->exp_last_request_time,
+ cfs_time_current_sec() + extra_delay);
+
+ CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n",
+ exp->exp_client_uuid.uuid,
+ exp->exp_last_request_time, exp);
- for (i = 0; i < nbufs; i++) {
- struct ptlrpc_request_buffer_desc *rqbd;
+ /* exports may get disconnected from the chain even though the
+ export has references, so we must keep the spin lock while
+ manipulating the lists */
+ spin_lock(&exp->exp_obd->obd_dev_lock);
- OBD_ALLOC(rqbd, sizeof(*rqbd));
- if (rqbd == NULL)
- GOTO(failed, NULL);
+ if (list_empty(&exp->exp_obd_chain_timed)) {
+ /* this one is not timed */
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+ EXIT;
+ return;
+ }
+
+ list_move_tail(&exp->exp_obd_chain_timed,
+ &exp->exp_obd->obd_exports_timed);
+
+ oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
+ struct obd_export, exp_obd_chain_timed);
+ oldest_time = oldest_exp->exp_last_request_time;
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
- rqbd->rqbd_service = service;
- ptl_set_inv_handle(&rqbd->rqbd_me_h);
- atomic_set(&rqbd->rqbd_refcount, 0);
- OBD_ALLOC(rqbd->rqbd_buffer, service->srv_buf_size);
- if (rqbd->rqbd_buffer == NULL) {
- OBD_FREE(rqbd, sizeof(*rqbd));
- GOTO(failed, NULL);
+ if (exp->exp_obd->obd_recovering) {
+ /* be nice to everyone during recovery */
+ EXIT;
+ return;
+ }
+
+ /* Note - racing to start/reset the obd_eviction timer is safe */
+ if (exp->exp_obd->obd_eviction_timer == 0) {
+ /* Check if the oldest entry is expired. */
+ if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
+ extra_delay)) {
+ /* We need a second timer, in case the net was down and
+ * it just came back. Since the pinger may skip every
+ * other PING_INTERVAL (see note in ptlrpc_pinger_main),
+ * we better wait for 3. */
+ exp->exp_obd->obd_eviction_timer =
+ cfs_time_current_sec() + 3 * PING_INTERVAL;
+ CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
+ exp->exp_obd->obd_name, obd_export_nid2str(exp),
+ oldest_time);
}
- list_add(&rqbd->rqbd_list, &service->srv_rqbds);
- service->srv_nrqbds++;
+ } else {
+ if (cfs_time_current_sec() >
+ (exp->exp_obd->obd_eviction_timer + extra_delay)) {
+ /* The evictor won't evict anyone who we've heard from
+ * recently, so we don't have to check before we start
+ * it. */
+ if (!ping_evictor_wake(exp))
+ exp->exp_obd->obd_eviction_timer = 0;
+ }
+ }
+
+ EXIT;
+}
+
+static int ptlrpc_check_req(struct ptlrpc_request *req)
+{
+ if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
+ req->rq_export->exp_conn_cnt)) {
+ DEBUG_REQ(D_ERROR, req,
+ "DROPPING req from old connection %d < %d",
+ lustre_msg_get_conn_cnt(req->rq_reqmsg),
+ req->rq_export->exp_conn_cnt);
+ return -EEXIST;
+ }
+ if (unlikely(req->rq_export->exp_obd &&
+ req->rq_export->exp_obd->obd_fail)) {
+ /* Failing over, don't handle any more reqs, send
+ error response instead. */
+ CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
+ req, req->rq_export->exp_obd->obd_name);
+ req->rq_status = -ENODEV;
+ ptlrpc_error(req);
+ return -ENODEV;
+ }
+
+ return 0;
+}
- ptlrpc_link_svc_me(rqbd);
+static void ptlrpc_at_set_timer(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request *rq;
+ __s32 next;
+
+ spin_lock(&svc->srv_at_lock);
+ if (list_empty(&svc->srv_at_list)) {
+ cfs_timer_disarm(&svc->srv_at_timer);
+ spin_unlock(&svc->srv_at_lock);
+ return;
}
- CDEBUG(D_NET, "Starting service listening on portal %d (eq: %p)\n",
- service->srv_req_portal, service->srv_eq_h.handle_idx);
+ /* Set timer for closest deadline */
+ rq = list_entry(svc->srv_at_list.next, struct ptlrpc_request,
+ rq_timed_list);
+ next = (__s32)(rq->rq_deadline - cfs_time_current_sec() -
+ at_early_margin);
+ if (next <= 0)
+ ptlrpc_at_timer((unsigned long)svc);
+ else
+ cfs_timer_arm(&svc->srv_at_timer, cfs_time_shift(next));
+ spin_unlock(&svc->srv_at_lock);
+ CDEBUG(D_INFO, "armed %s at %+ds\n", svc->srv_name, next);
+}
- RETURN(service);
-failed:
- ptlrpc_unregister_service(service);
- return NULL;
+/* Add rpc to early reply check list */
+static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
+{
+ struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
+ struct ptlrpc_request *rq;
+ int found = 0;
+
+ if (AT_OFF)
+ return(0);
+
+ if (req->rq_no_reply)
+ return 0;
+
+ if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
+ return(-ENOSYS);
+
+ spin_lock(&svc->srv_at_lock);
+
+ if (unlikely(req->rq_sent_final)) {
+ spin_unlock(&svc->srv_at_lock);
+ return 0;
+ }
+
+ LASSERT(list_empty(&req->rq_timed_list));
+ /* Add to sorted list. Presumably latest rpcs will have the latest
+ deadlines, so search backward. */
+ list_for_each_entry_reverse(rq, &svc->srv_at_list, rq_timed_list) {
+ if (req->rq_deadline >= rq->rq_deadline) {
+ list_add(&req->rq_timed_list, &rq->rq_timed_list);
+ found++;
+ break;
+ }
+ }
+ if (!found)
+ /* Add to front if shortest deadline or list empty */
+ list_add(&req->rq_timed_list, &svc->srv_at_list);
+
+ /* Check if we're the head of the list */
+ found = (svc->srv_at_list.next == &req->rq_timed_list);
+
+ spin_unlock(&svc->srv_at_lock);
+
+ if (found)
+ ptlrpc_at_set_timer(svc);
+
+ return 0;
}
-static int handle_incoming_request(struct obd_device *obddev,
- struct ptlrpc_service *svc,
- ptl_event_t *event,
- struct ptlrpc_request *request)
+static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req,
+ int extra_time)
{
- struct ptlrpc_request_buffer_desc *rqbd = event->mem_desc.user_ptr;
+ struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
+ struct ptlrpc_request *reqcopy;
+ struct lustre_msg *reqmsg;
+ cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
+ time_t newdl;
int rc;
+ ENTRY;
- /* FIXME: If we move to an event-driven model, we should put the request
- * on the stack of mds_handle instead. */
+ /* deadline is when the client expects us to reply, margin is the
+ difference between clients' and servers' expectations */
+ DEBUG_REQ(D_ADAPTTO, req,
+ "%ssending early reply (deadline %+lds, margin %+lds) for "
+ "%d+%d", AT_OFF ? "AT off - not " : "",
+ olddl, olddl - at_get(&svc->srv_at_estimate),
+ at_get(&svc->srv_at_estimate), extra_time);
- LASSERT (atomic_read (&rqbd->rqbd_refcount) > 0);
- LASSERT ((event->mem_desc.options & PTL_MD_IOV) == 0);
- LASSERT (rqbd->rqbd_service == svc);
- LASSERT (rqbd->rqbd_buffer == event->mem_desc.start);
- LASSERT (event->offset + event->mlength <= svc->srv_buf_size);
+ if (AT_OFF)
+ RETURN(0);
- memset(request, 0, sizeof(*request));
- request->rq_svc = svc;
- request->rq_obd = obddev;
- request->rq_xid = event->match_bits;
- request->rq_reqmsg = event->mem_desc.start + event->offset;
- request->rq_reqlen = event->mlength;
+ if (olddl < 0) {
+ DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
+ "not sending early reply. Consider increasing "
+ "at_early_margin (%d)?", olddl, at_early_margin);
- rc = -EINVAL;
+ /* Return an error so we're not re-added to the timed list. */
+ RETURN(-ETIMEDOUT);
+ }
- if (request->rq_reqlen < sizeof(struct lustre_msg)) {
- CERROR("incomplete request (%d): ptl %d from "LPX64" xid "
- LPD64"\n",
- request->rq_reqlen, svc->srv_req_portal,
- event->initiator.nid, request->rq_xid);
- goto out;
+ if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
+ DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
+ "but no AT support");
+ RETURN(-ENOSYS);
}
- if (NTOH__u32(request->rq_reqmsg->type) != PTL_RPC_MSG_REQUEST) {
- CERROR("wrong packet type received (type=%u)\n",
- request->rq_reqmsg->type);
- goto out;
+ if (req->rq_export && req->rq_export->exp_in_recovery) {
+ /* don't increase server estimates during recovery, and give
+ clients the full recovery time. */
+ newdl = cfs_time_current_sec() +
+ req->rq_export->exp_obd->obd_recovery_timeout;
+ } else {
+ if (extra_time) {
+ /* Fake our processing time into the future to ask the
+ clients for some extra amount of time */
+ extra_time += cfs_time_current_sec() -
+ req->rq_arrival_time.tv_sec;
+ at_add(&svc->srv_at_estimate, extra_time);
+ }
+ newdl = req->rq_arrival_time.tv_sec +
+ at_get(&svc->srv_at_estimate);
+ }
+ if (req->rq_deadline >= newdl) {
+ /* We're not adding any time, no need to send an early reply
+ (e.g. maybe at adaptive_max) */
+ DEBUG_REQ(D_WARNING, req, "Couldn't add any time ("
+ CFS_DURATION_T"/"CFS_DURATION_T"), "
+ "not sending early reply\n", olddl,
+ cfs_time_sub(newdl, cfs_time_current_sec()));
+ RETURN(-ETIMEDOUT);
}
- if (request->rq_reqmsg->magic != PTLRPC_MSG_MAGIC) {
- CERROR("wrong lustre_msg magic %d: ptl %d from "LPX64" xid "
- LPD64"\n",
- request->rq_reqmsg->magic, svc->srv_req_portal,
- event->initiator.nid, request->rq_xid);
- goto out;
+ OBD_ALLOC(reqcopy, sizeof *reqcopy);
+ if (reqcopy == NULL)
+ RETURN(-ENOMEM);
+ OBD_ALLOC(reqmsg, req->rq_reqlen);
+ if (!reqmsg) {
+ OBD_FREE(reqcopy, sizeof *reqcopy);
+ RETURN(-ENOMEM);
}
- if (request->rq_reqmsg->version != PTLRPC_MSG_VERSION) {
- CERROR("wrong lustre_msg version %d: ptl %d from "LPX64" xid "
- LPD64"\n",
- request->rq_reqmsg->version, svc->srv_req_portal,
- event->initiator.nid, request->rq_xid);
- goto out;
+ *reqcopy = *req;
+ reqcopy->rq_reply_state = NULL;
+ reqcopy->rq_rep_swab_mask = 0;
+ reqcopy->rq_pack_bulk = 0;
+ reqcopy->rq_pack_udesc = 0;
+ reqcopy->rq_packed_final = 0;
+ sptlrpc_svc_ctx_addref(reqcopy);
+ /* We only need the reqmsg for the magic */
+ reqcopy->rq_reqmsg = reqmsg;
+ memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
+
+ if (req->rq_sent_final) {
+ DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
+ "abort sending early reply\n");
+ GOTO(out, rc = 0);
}
- CDEBUG(D_NET, "got req "LPD64" (md: %p + %d)\n", request->rq_xid,
- event->mem_desc.start, event->offset);
+ /* Connection ref */
+ reqcopy->rq_export = class_conn2export(
+ lustre_msg_get_handle(reqcopy->rq_reqmsg));
+ if (reqcopy->rq_export == NULL)
+ GOTO(out, rc = -ENODEV);
- request->rq_peer.peer_nid = event->initiator.nid;
- /* FIXME: this NI should be the incoming NI.
- * We don't know how to find that from here. */
- request->rq_peer.peer_ni = svc->srv_self.peer_ni;
+ /* RPC ref */
+ class_export_rpc_get(reqcopy->rq_export);
+ if (reqcopy->rq_export->exp_obd &&
+ reqcopy->rq_export->exp_obd->obd_fail)
+ GOTO(out_put, rc = -ENODEV);
- request->rq_export = class_conn2export((struct lustre_handle *)
- request->rq_reqmsg);
+ rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
+ if (rc)
+ GOTO(out_put, rc);
- if (request->rq_export) {
- request->rq_connection = request->rq_export->exp_connection;
- ptlrpc_connection_addref(request->rq_connection);
+ rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
+
+ if (!rc) {
+ /* Adjust our own deadline to what we told the client */
+ req->rq_deadline = newdl;
+ req->rq_early_count++; /* number sent, server side */
} else {
- /* create a (hopefully temporary) connection that will be used
- * to send the reply if this call doesn't create an export.
- * XXX revisit this when we revamp ptlrpc */
- request->rq_connection =
- ptlrpc_get_connection(&request->rq_peer, NULL);
+ DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
+ }
+
+ /* Free the (early) reply state from lustre_pack_reply.
+ (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
+ ptlrpc_req_drop_rs(reqcopy);
+
+out_put:
+ class_export_rpc_put(reqcopy->rq_export);
+ class_export_put(reqcopy->rq_export);
+out:
+ sptlrpc_svc_ctx_decref(reqcopy);
+ OBD_FREE(reqmsg, req->rq_reqlen);
+ OBD_FREE(reqcopy, sizeof *reqcopy);
+ RETURN(rc);
+}
+
+/* Send early replies to everybody expiring within at_early_margin
+ asking for at_extra time */
+static int ptlrpc_at_check_timed(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request *rq, *n;
+ struct list_head work_list;
+ time_t now = cfs_time_current_sec();
+ cfs_duration_t delay;
+ int first, counter = 0;
+ ENTRY;
+
+ spin_lock(&svc->srv_at_lock);
+ if (svc->srv_at_check == 0) {
+ spin_unlock(&svc->srv_at_lock);
+ RETURN(0);
+ }
+ delay = cfs_time_sub(cfs_time_current(), svc->srv_at_checktime);
+ svc->srv_at_check = 0;
+
+ if (list_empty(&svc->srv_at_list)) {
+ spin_unlock(&svc->srv_at_lock);
+ RETURN(0);
+ }
+
+ /* The timer went off, but maybe the nearest rpc already completed. */
+ rq = list_entry(svc->srv_at_list.next, struct ptlrpc_request,
+ rq_timed_list);
+ first = (int)(rq->rq_deadline - now);
+ if (first > at_early_margin) {
+ /* We've still got plenty of time. Reset the timer. */
+ spin_unlock(&svc->srv_at_lock);
+ ptlrpc_at_set_timer(svc);
+ RETURN(0);
+ }
+
+ /* We're close to a timeout, and we don't know how much longer the
+ server will take. Send early replies to everyone expiring soon. */
+ CFS_INIT_LIST_HEAD(&work_list);
+ list_for_each_entry_safe(rq, n, &svc->srv_at_list, rq_timed_list) {
+ if (rq->rq_deadline <= now + at_early_margin) {
+ list_move_tail(&rq->rq_timed_list, &work_list);
+ counter++;
+ } else {
+ break;
+ }
+ }
+
+ spin_unlock(&svc->srv_at_lock);
+
+ /* we have a new earliest deadline, restart the timer */
+ ptlrpc_at_set_timer(svc);
+
+ CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
+ "replies\n", first, at_extra, counter);
+ if (first < 0) {
+ /* We're already past request deadlines before we even get a
+ chance to send early replies */
+ LCONSOLE_WARN("%s: This server is not able to keep up with "
+ "request traffic (cpu-bound).\n", svc->srv_name);
+ CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
+ "delay="CFS_DURATION_T"(jiff)\n",
+ counter, svc->srv_n_queued_reqs, svc->srv_n_active_reqs,
+ at_get(&svc->srv_at_estimate), delay);
+ }
+
+ /* ptlrpc_server_finish_request may delete an entry out of
+ * the work list */
+ spin_lock(&svc->srv_at_lock);
+ while (!list_empty(&work_list)) {
+ rq = list_entry(work_list.next, struct ptlrpc_request,
+ rq_timed_list);
+ list_del_init(&rq->rq_timed_list);
+ /* if the entry is still in the worklist, it hasn't been
+ deleted, and is safe to take a ref to keep the req around */
+ atomic_inc(&rq->rq_refcount);
+ spin_unlock(&svc->srv_at_lock);
+
+ if (ptlrpc_at_send_early_reply(rq, at_extra) == 0)
+ ptlrpc_at_add_timed(rq);
+
+ ptlrpc_server_drop_request(rq);
+ spin_lock(&svc->srv_at_lock);
+ }
+ spin_unlock(&svc->srv_at_lock);
+
+ RETURN(0);
+}
+
+/* Handle freshly incoming reqs, add to timed early reply list,
+ pass on to regular request queue */
+static int
+ptlrpc_server_handle_req_in(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request *req;
+ __u32 deadline;
+ int rc;
+ ENTRY;
+
+ LASSERT(svc);
+
+ spin_lock(&svc->srv_lock);
+ if (list_empty(&svc->srv_req_in_queue)) {
+ spin_unlock(&svc->srv_lock);
+ RETURN(0);
+ }
+
+ req = list_entry(svc->srv_req_in_queue.next,
+ struct ptlrpc_request, rq_list);
+ list_del_init (&req->rq_list);
+ /* Consider this still a "queued" request as far as stats are
+ concerned */
+ spin_unlock(&svc->srv_lock);
+
+ /* go through security check/transform */
+ rc = sptlrpc_svc_unwrap_request(req);
+ switch (rc) {
+ case SECSVC_OK:
+ break;
+ case SECSVC_COMPLETE:
+ target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
+ goto err_req;
+ case SECSVC_DROP:
+ goto err_req;
+ default:
+ LBUG();
+ }
+
+ /* Clear request swab mask; this is a new request */
+ req->rq_req_swab_mask = 0;
+
+ rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
+ if (rc != 0) {
+ CERROR("error unpacking request: ptl %d from %s x"LPU64"\n",
+ svc->srv_req_portal, libcfs_id2str(req->rq_peer),
+ req->rq_xid);
+ goto err_req;
+ }
+
+ rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
+ if (rc) {
+ CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
+ LPU64"\n", svc->srv_req_portal,
+ libcfs_id2str(req->rq_peer), req->rq_xid);
+ goto err_req;
+ }
+
+ rc = -EINVAL;
+ if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
+ CERROR("wrong packet type received (type=%u) from %s\n",
+ lustre_msg_get_type(req->rq_reqmsg),
+ libcfs_id2str(req->rq_peer));
+ goto err_req;
+ }
+
+ CDEBUG(D_NET, "got req "LPD64"\n", req->rq_xid);
+
+ req->rq_export = class_conn2export(
+ lustre_msg_get_handle(req->rq_reqmsg));
+ if (req->rq_export) {
+ rc = ptlrpc_check_req(req);
+ if (rc == 0) {
+ rc = sptlrpc_target_export_check(req->rq_export, req);
+ if (rc)
+ DEBUG_REQ(D_ERROR, req, "DROPPING req with "
+ "illegal security flavor,");
+ }
+
+ class_export_put(req->rq_export);
+ req->rq_export = NULL;
+ if (rc)
+ goto err_req;
+ }
+
+ /* req_in handling should/must be fast */
+ if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
+ DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
+ cfs_time_sub(cfs_time_current_sec(),
+ req->rq_arrival_time.tv_sec));
+
+ /* Set rpc server deadline and add it to the timed list */
+ deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
+ MSGHDR_AT_SUPPORT) ?
+ /* The max time the client expects us to take */
+ lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
+ req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
+ if (unlikely(deadline == 0)) {
+ DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
+ goto err_req;
+ }
+
+ ptlrpc_at_add_timed(req);
+
+ /* Move it over to the request processing queue */
+ spin_lock(&svc->srv_lock);
+ list_add_tail(&req->rq_list, &svc->srv_request_queue);
+ cfs_waitq_signal(&svc->srv_waitq);
+ spin_unlock(&svc->srv_lock);
+ RETURN(1);
+
+err_req:
+ spin_lock(&svc->srv_lock);
+ svc->srv_n_queued_reqs--;
+ svc->srv_n_active_reqs++;
+ spin_unlock(&svc->srv_lock);
+ ptlrpc_server_finish_request(req);
+
+ RETURN(1);
+}
+
+static int
+ptlrpc_server_handle_request(struct ptlrpc_service *svc,
+ struct ptlrpc_thread *thread)
+{
+ struct obd_export *export = NULL;
+ struct ptlrpc_request *request;
+ struct timeval work_start;
+ struct timeval work_end;
+ long timediff;
+ int rc;
+ ENTRY;
+
+ LASSERT(svc);
+
+ spin_lock(&svc->srv_lock);
+ if (unlikely(list_empty (&svc->srv_request_queue) ||
+ (
+#ifndef __KERNEL__
+ /* !@%$# liblustre only has 1 thread */
+ svc->srv_n_difficult_replies != 0 &&
+#endif
+ svc->srv_n_active_reqs >= (svc->srv_threads_running - 1)))) {
+ /* Don't handle regular requests in the last thread, in order * re
+ * to handle difficult replies (which might block other threads)
+ * as well as handle any incoming reqs, early replies, etc.
+ * That means we always need at least 2 service threads. */
+ spin_unlock(&svc->srv_lock);
+ RETURN(0);
+ }
+
+ request = list_entry (svc->srv_request_queue.next,
+ struct ptlrpc_request, rq_list);
+ list_del_init (&request->rq_list);
+ svc->srv_n_queued_reqs--;
+ svc->srv_n_active_reqs++;
+
+ spin_unlock(&svc->srv_lock);
+
+ if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
+ libcfs_debug_dumplog();
+
+ do_gettimeofday(&work_start);
+ timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
+ if (likely(svc->srv_stats != NULL)) {
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
+ timediff);
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
+ svc->srv_n_queued_reqs);
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
+ svc->srv_n_active_reqs);
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
+ at_get(&svc->srv_at_estimate));
+ }
+
+ rc = lu_context_init(&request->rq_session, LCT_SESSION);
+ if (rc) {
+ CERROR("Failure to initialize session: %d\n", rc);
+ goto out_req;
+ }
+ request->rq_session.lc_thread = thread;
+ lu_context_enter(&request->rq_session);
+
+ CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
+
+ request->rq_svc_thread = thread;
+ if (thread)
+ request->rq_svc_thread->t_env->le_ses = &request->rq_session;
+
+ request->rq_export = class_conn2export(
+ lustre_msg_get_handle(request->rq_reqmsg));
+
+ if (likely(request->rq_export)) {
+ if (unlikely(ptlrpc_check_req(request)))
+ goto put_conn;
+ ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
+ export = class_export_rpc_get(request->rq_export);
}
+ /* Discard requests queued for longer than the deadline.
+ The deadline is increased if we send an early reply. */
+ if (cfs_time_current_sec() > request->rq_deadline) {
+ DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
+ ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
+ libcfs_id2str(request->rq_peer),
+ cfs_time_sub(request->rq_deadline,
+ request->rq_arrival_time.tv_sec),
+ cfs_time_sub(cfs_time_current_sec(),
+ request->rq_deadline));
+ goto put_rpc_export;
+ }
+
+ request->rq_phase = RQ_PHASE_INTERPRET;
+
+ CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
+ "%s:%s+%d:%d:x"LPU64":%s:%d\n", cfs_curproc_comm(),
+ (request->rq_export ?
+ (char *)request->rq_export->exp_client_uuid.uuid : "0"),
+ (request->rq_export ?
+ atomic_read(&request->rq_export->exp_refcount) : -99),
+ lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
+ libcfs_id2str(request->rq_peer),
+ lustre_msg_get_opc(request->rq_reqmsg));
+
+ OBD_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, obd_fail_val);
+
rc = svc->srv_handler(request);
- ptlrpc_put_connection(request->rq_connection);
- out:
- if (atomic_dec_and_test (&rqbd->rqbd_refcount)) /* last reference? */
- ptlrpc_link_svc_me (rqbd);
+ request->rq_phase = RQ_PHASE_COMPLETE;
+
+ CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
+ "%s:%s+%d:%d:x"LPU64":%s:%d\n", cfs_curproc_comm(),
+ (request->rq_export ?
+ (char *)request->rq_export->exp_client_uuid.uuid : "0"),
+ (request->rq_export ?
+ atomic_read(&request->rq_export->exp_refcount) : -99),
+ lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
+ libcfs_id2str(request->rq_peer),
+ lustre_msg_get_opc(request->rq_reqmsg));
+
+put_rpc_export:
+ if (export != NULL)
+ class_export_rpc_put(export);
+put_conn:
+ if (likely(request->rq_export != NULL))
+ class_export_put(request->rq_export);
+
+ lu_context_exit(&request->rq_session);
+ lu_context_fini(&request->rq_session);
+
+ if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
+ DEBUG_REQ(D_WARNING, request, "Request x"LPU64" took longer "
+ "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
+ " client may timeout.",
+ request->rq_xid, cfs_time_sub(request->rq_deadline,
+ request->rq_arrival_time.tv_sec),
+ cfs_time_sub(cfs_time_current_sec(),
+ request->rq_deadline));
+ }
- return rc;
+ do_gettimeofday(&work_end);
+ timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
+ CDEBUG(D_RPCTRACE, "request x"LPU64" opc %u from %s processed in "
+ "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
+ request->rq_xid, lustre_msg_get_opc(request->rq_reqmsg),
+ libcfs_id2str(request->rq_peer), timediff,
+ cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
+ request->rq_repmsg ? lustre_msg_get_transno(request->rq_repmsg) :
+ request->rq_transno, request->rq_status,
+ request->rq_repmsg ? lustre_msg_get_status(request->rq_repmsg):
+ -999);
+ if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
+ __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
+ int opc = opcode_offset(op);
+ if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
+ LASSERT(opc < LUSTRE_MAX_OPCODES);
+ lprocfs_counter_add(svc->srv_stats,
+ opc + EXTRA_MAX_OPCODES,
+ timediff);
+ }
+ }
+ if (unlikely(request->rq_early_count)) {
+ DEBUG_REQ(D_ADAPTTO, request,
+ "sent %d early replies before finishing in "
+ CFS_DURATION_T"s",
+ request->rq_early_count,
+ cfs_time_sub(work_end.tv_sec,
+ request->rq_arrival_time.tv_sec));
+ }
+
+out_req:
+ ptlrpc_server_finish_request(request);
+
+ RETURN(1);
+}
+
+static int
+ptlrpc_server_handle_reply (struct ptlrpc_service *svc)
+{
+ struct ptlrpc_reply_state *rs;
+ struct obd_export *exp;
+ struct obd_device *obd;
+ int nlocks;
+ int been_handled;
+ ENTRY;
+
+ spin_lock(&svc->srv_lock);
+ if (list_empty (&svc->srv_reply_queue)) {
+ spin_unlock(&svc->srv_lock);
+ RETURN(0);
+ }
+
+ rs = list_entry (svc->srv_reply_queue.next,
+ struct ptlrpc_reply_state, rs_list);
+
+ exp = rs->rs_export;
+ obd = exp->exp_obd;
+
+ LASSERT (rs->rs_difficult);
+ LASSERT (rs->rs_scheduled);
+
+ list_del_init (&rs->rs_list);
+
+ /* Disengage from notifiers carefully (lock order - irqrestore below!)*/
+ spin_unlock(&svc->srv_lock);
+
+ spin_lock (&obd->obd_uncommitted_replies_lock);
+ /* Noop if removed already */
+ list_del_init (&rs->rs_obd_list);
+ spin_unlock (&obd->obd_uncommitted_replies_lock);
+
+ spin_lock (&exp->exp_lock);
+ /* Noop if removed already */
+ list_del_init (&rs->rs_exp_list);
+ spin_unlock (&exp->exp_lock);
+
+ spin_lock(&svc->srv_lock);
+
+ been_handled = rs->rs_handled;
+ rs->rs_handled = 1;
+
+ nlocks = rs->rs_nlocks; /* atomic "steal", but */
+ rs->rs_nlocks = 0; /* locks still on rs_locks! */
+
+ if (nlocks == 0 && !been_handled) {
+ /* If we see this, we should already have seen the warning
+ * in mds_steal_ack_locks() */
+ CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
+ " o%d NID %s\n",
+ rs,
+ rs->rs_xid, rs->rs_transno,
+ lustre_msg_get_opc(rs->rs_msg),
+ libcfs_nid2str(exp->exp_connection->c_peer.nid));
+ }
+
+ if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
+ spin_unlock(&svc->srv_lock);
+
+ if (!been_handled && rs->rs_on_net) {
+ LNetMDUnlink(rs->rs_md_h);
+ /* Ignore return code; we're racing with
+ * completion... */
+ }
+
+ while (nlocks-- > 0)
+ ldlm_lock_decref(&rs->rs_locks[nlocks],
+ rs->rs_modes[nlocks]);
+
+ spin_lock(&svc->srv_lock);
+ }
+
+ rs->rs_scheduled = 0;
+
+ if (!rs->rs_on_net) {
+ /* Off the net */
+ svc->srv_n_difficult_replies--;
+ if (svc->srv_n_difficult_replies == 0 && svc->srv_is_stopping)
+ /* wake up threads that are being stopped by
+ ptlrpc_unregister_service/ptlrpc_stop_threads
+ and sleep waiting svr_n_difficult_replies == 0 */
+ cfs_waitq_broadcast(&svc->srv_waitq);
+ spin_unlock(&svc->srv_lock);
+
+ class_export_put (exp);
+ rs->rs_export = NULL;
+ ptlrpc_rs_decref (rs);
+ atomic_dec (&svc->srv_outstanding_replies);
+ RETURN(1);
+ }
+
+ /* still on the net; callback will schedule */
+ spin_unlock(&svc->srv_lock);
+ RETURN(1);
+}
+
+#ifndef __KERNEL__
+/* FIXME make use of timeout later */
+int
+liblustre_check_services (void *arg)
+{
+ int did_something = 0;
+ int rc;
+ struct list_head *tmp, *nxt;
+ ENTRY;
+
+ /* I'm relying on being single threaded, not to have to lock
+ * ptlrpc_all_services etc */
+ list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
+ struct ptlrpc_service *svc =
+ list_entry (tmp, struct ptlrpc_service, srv_list);
+
+ if (svc->srv_threads_running != 0) /* I've recursed */
+ continue;
+
+ /* service threads can block for bulk, so this limits us
+ * (arbitrarily) to recursing 1 stack frame per service.
+ * Note that the problem with recursion is that we have to
+ * unwind completely before our caller can resume. */
+
+ svc->srv_threads_running++;
+
+ do {
+ rc = ptlrpc_server_handle_req_in(svc);
+ rc |= ptlrpc_server_handle_reply(svc);
+ rc |= ptlrpc_at_check_timed(svc);
+ rc |= ptlrpc_server_handle_request(svc, NULL);
+ rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
+ did_something |= rc;
+ } while (rc);
+
+ svc->srv_threads_running--;
+ }
+
+ RETURN(did_something);
+}
+#define ptlrpc_stop_all_threads(s) do {} while (0)
+
+#else /* __KERNEL__ */
+
+/* Don't use daemonize, it removes fs struct from new thread (bug 418) */
+void ptlrpc_daemonize(char *name)
+{
+ struct fs_struct *fs = current->fs;
+
+ atomic_inc(&fs->count);
+ cfs_daemonize(name);
+ exit_fs(cfs_current());
+ current->fs = fs;
+ ll_set_fs_pwd(current->fs, init_task.fs->pwdmnt, init_task.fs->pwd);
+}
+
+static void
+ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
+{
+ int avail = svc->srv_nrqbd_receiving;
+ int low_water = test_req_buffer_pressure ? 0 :
+ svc->srv_nbuf_per_group/2;
+
+ /* NB I'm not locking; just looking. */
+
+ /* CAVEAT EMPTOR: We might be allocating buffers here because we've
+ * allowed the request history to grow out of control. We could put a
+ * sanity check on that here and cull some history if we need the
+ * space. */
+
+ if (avail <= low_water)
+ ptlrpc_grow_req_bufs(svc);
+
+ if (svc->srv_stats)
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
+ avail);
+}
+
+static int
+ptlrpc_retry_rqbds(void *arg)
+{
+ struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
+
+ svc->srv_rqbd_timeout = 0;
+ return (-ETIMEDOUT);
}
static int ptlrpc_main(void *arg)
{
struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
- struct obd_device *obddev = data->dev;
- struct ptlrpc_service *svc = data->svc;
- struct ptlrpc_thread *thread = data->thread;
- struct ptlrpc_request *request;
- ptl_event_t *event;
- int rc = 0;
-
+ struct ptlrpc_service *svc = data->svc;
+ struct ptlrpc_thread *thread = data->thread;
+ struct obd_device *dev = data->dev;
+ struct ptlrpc_reply_state *rs;
+ struct lc_watchdog *watchdog;
+#ifdef WITH_GROUP_INFO
+ struct group_info *ginfo = NULL;
+#endif
+ struct lu_env env;
+ int counter = 0, rc = 0;
ENTRY;
- lock_kernel();
- daemonize();
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
- sigfillset(¤t->blocked);
- recalc_sigpending();
-#else
- spin_lock_irq(¤t->sigmask_lock);
- sigfillset(¤t->blocked);
- recalc_sigpending(current);
- spin_unlock_irq(¤t->sigmask_lock);
+ ptlrpc_daemonize(data->name);
+
+#if defined(HAVE_NODE_TO_CPUMASK) && defined(CONFIG_NUMA)
+ /* we need to do this before any per-thread allocation is done so that
+ * we get the per-thread allocations on local node. bug 7342 */
+ if (svc->srv_cpu_affinity) {
+ int cpu, num_cpu;
+
+ for (cpu = 0, num_cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ if (!cpu_online(cpu))
+ continue;
+ if (num_cpu == thread->t_id % num_online_cpus())
+ break;
+ num_cpu++;
+ }
+ set_cpus_allowed(cfs_current(), node_to_cpumask(cpu_to_node(cpu)));
+ }
#endif
- strcpy(current->comm, data->name);
- unlock_kernel();
+#ifdef WITH_GROUP_INFO
+ ginfo = groups_alloc(0);
+ if (!ginfo) {
+ rc = -ENOMEM;
+ goto out;
+ }
- OBD_ALLOC(event, sizeof(*event));
- if (!event)
- GOTO(out, rc = -ENOMEM);
- OBD_ALLOC(request, sizeof(*request));
- if (!request)
- GOTO(out_event, rc = -ENOMEM);
+ set_current_groups(ginfo);
+ put_group_info(ginfo);
+#endif
+
+ if (svc->srv_init != NULL) {
+ rc = svc->srv_init(thread);
+ if (rc)
+ goto out;
+ }
+
+ rc = lu_context_init(&env.le_ctx, svc->srv_ctx_tags);
+ if (rc)
+ goto out_srv_fini;
+
+ thread->t_env = &env;
+ env.le_ctx.lc_thread = thread;
+
+ /* Alloc reply state structure for this one */
+ OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
+ if (!rs) {
+ rc = -ENOMEM;
+ goto out_srv_fini;
+ }
/* Record that the thread is running */
thread->t_flags = SVC_RUNNING;
- wake_up(&thread->t_ctl_waitq);
+ /*
+ * wake up our creator. Note: @data is invalid after this point,
+ * because it's allocated on ptlrpc_start_thread() stack.
+ */
+ cfs_waitq_signal(&thread->t_ctl_waitq);
+
+ watchdog = lc_watchdog_add(max_t(int, obd_timeout, AT_OFF ? 0 :
+ at_get(&svc->srv_at_estimate)) *
+ svc->srv_watchdog_factor, NULL, NULL);
+
+ spin_lock(&svc->srv_lock);
+ svc->srv_threads_running++;
+ list_add(&rs->rs_list, &svc->srv_free_rs_list);
+ spin_unlock(&svc->srv_lock);
+ cfs_waitq_signal(&svc->srv_free_rs_waitq);
+
+ CDEBUG(D_NET, "service thread %d (#%d)started\n", thread->t_id,
+ svc->srv_threads_running);
/* XXX maintain a list of all managed devices: insert here */
- /* And now, loop forever on requests */
- while (1) {
- wait_event(svc->srv_waitq,
- ptlrpc_check_event(svc, thread, event));
+ while ((thread->t_flags & SVC_STOPPING) == 0 ||
+ svc->srv_n_difficult_replies != 0) {
+ /* Don't exit while there are replies to be handled */
+ struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
+ ptlrpc_retry_rqbds, svc);
+
+ lc_watchdog_disable(watchdog);
+
+ cond_resched();
+
+ l_wait_event_exclusive (svc->srv_waitq,
+ ((thread->t_flags & SVC_STOPPING) != 0 &&
+ svc->srv_n_difficult_replies == 0) ||
+ (!list_empty(&svc->srv_idle_rqbds) &&
+ svc->srv_rqbd_timeout == 0) ||
+ !list_empty(&svc->srv_req_in_queue) ||
+ !list_empty(&svc->srv_reply_queue) ||
+ (!list_empty(&svc->srv_request_queue) &&
+ (svc->srv_n_active_reqs <
+ (svc->srv_threads_running - 1))) ||
+ svc->srv_at_check,
+ &lwi);
+
+ lc_watchdog_touch_ms(watchdog, max_t(int, obd_timeout,
+ AT_OFF ? 0 :
+ at_get(&svc->srv_at_estimate)) *
+ svc->srv_watchdog_factor);
+
+ ptlrpc_check_rqbd_pool(svc);
+
+ if ((svc->srv_threads_started < svc->srv_threads_max) &&
+ (svc->srv_n_active_reqs >= (svc->srv_threads_started - 1))){
+ /* Ignore return code - we tried... */
+ ptlrpc_start_thread(dev, svc);
+ }
- if (thread->t_flags & SVC_STOPPING) {
- spin_lock(&svc->srv_lock);
- thread->t_flags &= ~SVC_STOPPING;
- spin_unlock(&svc->srv_lock);
+ if (!list_empty(&svc->srv_reply_queue))
+ ptlrpc_server_handle_reply(svc);
- EXIT;
- break;
+ if (!list_empty(&svc->srv_req_in_queue)) {
+ /* Process all incoming reqs before handling any */
+ ptlrpc_server_handle_req_in(svc);
+ /* but limit ourselves in case of flood */
+ if (counter++ < 1000)
+ continue;
+ counter = 0;
}
- if (thread->t_flags & SVC_EVENT) {
- spin_lock(&svc->srv_lock);
- thread->t_flags &= ~SVC_EVENT;
- spin_unlock(&svc->srv_lock);
+ if (svc->srv_at_check)
+ ptlrpc_at_check_timed(svc);
- rc = handle_incoming_request(obddev, svc, event,
- request);
- continue;
+ /* don't handle requests in the last thread */
+ if (!list_empty (&svc->srv_request_queue) &&
+ (svc->srv_n_active_reqs < (svc->srv_threads_running - 1))) {
+ lu_context_enter(&env.le_ctx);
+ ptlrpc_server_handle_request(svc, thread);
+ lu_context_exit(&env.le_ctx);
}
- CERROR("unknown break in service");
- LBUG();
- EXIT;
- break;
+ if (!list_empty(&svc->srv_idle_rqbds) &&
+ ptlrpc_server_post_idle_rqbds(svc) < 0) {
+ /* I just failed to repost request buffers. Wait
+ * for a timeout (unless something else happens)
+ * before I try again */
+ svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
+ CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
+ svc->srv_nrqbd_receiving);
+ }
}
- OBD_FREE(request, sizeof(*request));
-out_event:
- OBD_FREE(event, sizeof(*event));
+ lc_watchdog_delete(watchdog);
+
+out_srv_fini:
+ /*
+ * deconstruct service specific state created by ptlrpc_start_thread()
+ */
+ if (svc->srv_done != NULL)
+ svc->srv_done(thread);
+
+ lu_context_fini(&env.le_ctx);
out:
+ CDEBUG(D_NET, "service thread %d exiting: rc %d\n", thread->t_id, rc);
+
+ spin_lock(&svc->srv_lock);
+ svc->srv_threads_running--; /* must know immediately */
+ thread->t_id = rc;
thread->t_flags = SVC_STOPPED;
- wake_up(&thread->t_ctl_waitq);
- CDEBUG(D_NET, "service thread exiting, process %d: rc = %d\n",
- current->pid, rc);
+ cfs_waitq_signal(&thread->t_ctl_waitq);
+ spin_unlock(&svc->srv_lock);
+
return rc;
}
static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
struct ptlrpc_thread *thread)
{
+ struct l_wait_info lwi = { 0 };
+ ENTRY;
+
+ CDEBUG(D_RPCTRACE, "Stopping thread %p\n", thread);
spin_lock(&svc->srv_lock);
thread->t_flags = SVC_STOPPING;
spin_unlock(&svc->srv_lock);
- wake_up(&svc->srv_waitq);
- wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED));
+ cfs_waitq_broadcast(&svc->srv_waitq);
+ l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED),
+ &lwi);
+
+ spin_lock(&svc->srv_lock);
+ list_del(&thread->t_link);
+ spin_unlock(&svc->srv_lock);
+
+ OBD_FREE_PTR(thread);
+ EXIT;
}
void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
{
+ struct ptlrpc_thread *thread;
+ ENTRY;
+
spin_lock(&svc->srv_lock);
while (!list_empty(&svc->srv_threads)) {
- struct ptlrpc_thread *thread;
- thread = list_entry(svc->srv_threads.next, struct ptlrpc_thread,
- t_link);
+ thread = list_entry(svc->srv_threads.next,
+ struct ptlrpc_thread, t_link);
+
spin_unlock(&svc->srv_lock);
ptlrpc_stop_thread(svc, thread);
spin_lock(&svc->srv_lock);
- list_del(&thread->t_link);
- OBD_FREE(thread, sizeof(*thread));
}
+
spin_unlock(&svc->srv_lock);
+ EXIT;
+}
+
+int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc)
+{
+ int i, rc = 0;
+ ENTRY;
+
+ /* We require 2 threads min - see note in
+ ptlrpc_server_handle_request */
+ LASSERT(svc->srv_threads_min >= 2);
+ for (i = 0; i < svc->srv_threads_min; i++) {
+ rc = ptlrpc_start_thread(dev, svc);
+ /* We have enough threads, don't start more. b=15759 */
+ if (rc == -EMFILE)
+ break;
+ if (rc) {
+ CERROR("cannot start %s thread #%d: rc %d\n",
+ svc->srv_thread_name, i, rc);
+ ptlrpc_stop_all_threads(svc);
+ }
+ }
+ RETURN(rc);
}
-int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
- char *name)
+int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc)
{
+ struct l_wait_info lwi = { 0 };
struct ptlrpc_svc_data d;
struct ptlrpc_thread *thread;
- int rc;
+ char name[32];
+ int id, rc;
ENTRY;
- OBD_ALLOC(thread, sizeof(*thread));
- if (thread == NULL) {
- LBUG();
+ CDEBUG(D_RPCTRACE, "%s started %d min %d max %d running %d\n",
+ svc->srv_name, svc->srv_threads_started, svc->srv_threads_min,
+ svc->srv_threads_max, svc->srv_threads_running);
+ if (unlikely(svc->srv_threads_started >= svc->srv_threads_max) ||
+ (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
+ svc->srv_threads_started == svc->srv_threads_min - 1))
+ RETURN(-EMFILE);
+
+ OBD_ALLOC_PTR(thread);
+ if (thread == NULL)
RETURN(-ENOMEM);
+ cfs_waitq_init(&thread->t_ctl_waitq);
+
+ spin_lock(&svc->srv_lock);
+ if (svc->srv_threads_started >= svc->srv_threads_max) {
+ spin_unlock(&svc->srv_lock);
+ OBD_FREE_PTR(thread);
+ RETURN(-EMFILE);
}
- init_waitqueue_head(&thread->t_ctl_waitq);
+ list_add(&thread->t_link, &svc->srv_threads);
+ id = svc->srv_threads_started++;
+ spin_unlock(&svc->srv_lock);
+ thread->t_id = id;
+ sprintf(name, "%s_%02d", svc->srv_thread_name, id);
d.dev = dev;
d.svc = svc;
d.name = name;
d.thread = thread;
- spin_lock(&svc->srv_lock);
- list_add(&thread->t_link, &svc->srv_threads);
- spin_unlock(&svc->srv_lock);
+ CDEBUG(D_RPCTRACE, "starting thread '%s'\n", name);
- /* XXX should we really be cloning open file handles here? */
- rc = kernel_thread(ptlrpc_main, (void *) &d,
- CLONE_VM | CLONE_FS | CLONE_FILES);
+ /* 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_main, &d, CLONE_VM | CLONE_FILES);
if (rc < 0) {
- CERROR("cannot start thread\n");
+ CERROR("cannot start thread '%s': rc %d\n", name, rc);
+
+ spin_lock(&svc->srv_lock);
+ list_del(&thread->t_link);
+ --svc->srv_threads_started;
+ spin_unlock(&svc->srv_lock);
+
OBD_FREE(thread, sizeof(*thread));
RETURN(rc);
}
- wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING);
+ l_wait_event(thread->t_ctl_waitq,
+ thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
- RETURN(0);
+ rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
+ RETURN(rc);
}
+#endif
int ptlrpc_unregister_service(struct ptlrpc_service *service)
{
- int rc;
+ int rc;
+ struct l_wait_info lwi;
+ struct list_head *tmp;
+ struct ptlrpc_reply_state *rs, *t;
+ ENTRY;
- LASSERT (list_empty (&service->srv_threads));
+ service->srv_is_stopping = 1;
+ cfs_timer_disarm(&service->srv_at_timer);
- /* XXX We could reply (with failure) to all buffered requests
- * _after_ unlinking _all_ the request buffers, but _before_
- * freeing them.
- */
+ ptlrpc_stop_all_threads(service);
+ LASSERT(list_empty(&service->srv_threads));
+
+ spin_lock (&ptlrpc_all_services_lock);
+ list_del_init (&service->srv_list);
+ spin_unlock (&ptlrpc_all_services_lock);
- while (!list_empty (&service->srv_rqbds)) {
+ ptlrpc_lprocfs_unregister_service(service);
+
+ /* All history will be culled when the next request buffer is
+ * freed */
+ service->srv_max_history_rqbds = 0;
+
+ CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
+
+ rc = LNetClearLazyPortal(service->srv_req_portal);
+ LASSERT (rc == 0);
+
+ /* Unlink all the request buffers. This forces a 'final' event with
+ * its 'unlink' flag set for each posted rqbd */
+ list_for_each(tmp, &service->srv_active_rqbds) {
struct ptlrpc_request_buffer_desc *rqbd =
- list_entry (service->srv_rqbds.next,
- struct ptlrpc_request_buffer_desc,
- rqbd_list);
+ list_entry(tmp, struct ptlrpc_request_buffer_desc,
+ rqbd_list);
- list_del (&rqbd->rqbd_list);
+ rc = LNetMDUnlink(rqbd->rqbd_md_h);
+ LASSERT (rc == 0 || rc == -ENOENT);
+ }
- LASSERT (atomic_read (&rqbd->rqbd_refcount) > 0);
- /* refcount could be anything; it's possible for the
- * buffers to continued to get filled after all the server
- * threads exited. But we know they _have_ exited.
- */
+ /* Wait for the network to release any buffers it's currently
+ * filling */
+ for (;;) {
+ spin_lock(&service->srv_lock);
+ rc = service->srv_nrqbd_receiving;
+ spin_unlock(&service->srv_lock);
- (void) PtlMEUnlink(rqbd->rqbd_me_h);
- /* The callback handler could have unlinked this ME already
- * (we're racing with her) but it's safe to ensure it _has_
- * been unlinked.
- */
+ if (rc == 0)
+ break;
- OBD_FREE (rqbd->rqbd_buffer, service->srv_buf_size);
- OBD_FREE (rqbd, sizeof (*rqbd));
- service->srv_nrqbds--;
+ /* Network access will complete in finite time but the HUGE
+ * timeout lets us CWARN for visibility of sluggish NALs */
+ lwi = LWI_TIMEOUT(cfs_time_seconds(LONG_UNLINK), NULL, NULL);
+ rc = l_wait_event(service->srv_waitq,
+ service->srv_nrqbd_receiving == 0,
+ &lwi);
+ if (rc == -ETIMEDOUT)
+ CWARN("Service %s waiting for request buffers\n",
+ service->srv_name);
}
- LASSERT (service->srv_nrqbds == 0);
+ /* schedule all outstanding replies to terminate them */
+ spin_lock(&service->srv_lock);
+ while (!list_empty(&service->srv_active_replies)) {
+ struct ptlrpc_reply_state *rs =
+ list_entry(service->srv_active_replies.next,
+ struct ptlrpc_reply_state, rs_list);
+ ptlrpc_schedule_difficult_reply(rs);
+ }
+ spin_unlock(&service->srv_lock);
+
+ /* purge the request queue. NB No new replies (rqbds all unlinked)
+ * and no service threads, so I'm the only thread noodling the
+ * request queue now */
+ while (!list_empty(&service->srv_req_in_queue)) {
+ struct ptlrpc_request *req =
+ list_entry(service->srv_req_in_queue.next,
+ struct ptlrpc_request,
+ rq_list);
+
+ list_del(&req->rq_list);
+ service->srv_n_queued_reqs--;
+ service->srv_n_active_reqs++;
+ ptlrpc_server_finish_request(req);
+ }
+ while (!list_empty(&service->srv_request_queue)) {
+ struct ptlrpc_request *req =
+ list_entry(service->srv_request_queue.next,
+ struct ptlrpc_request,
+ rq_list);
- rc = PtlEQFree(service->srv_eq_h);
- if (rc)
- CERROR("PtlEQFree failed: %d\n", rc);
+ list_del(&req->rq_list);
+ service->srv_n_queued_reqs--;
+ service->srv_n_active_reqs++;
- OBD_FREE(service, sizeof(*service));
- if (rc)
- LBUG();
- return rc;
+ ptlrpc_server_finish_request(req);
+ }
+ LASSERT(service->srv_n_queued_reqs == 0);
+ LASSERT(service->srv_n_active_reqs == 0);
+ LASSERT(service->srv_n_history_rqbds == 0);
+ LASSERT(list_empty(&service->srv_active_rqbds));
+
+ /* Now free all the request buffers since nothing references them
+ * any more... */
+ while (!list_empty(&service->srv_idle_rqbds)) {
+ struct ptlrpc_request_buffer_desc *rqbd =
+ list_entry(service->srv_idle_rqbds.next,
+ struct ptlrpc_request_buffer_desc,
+ rqbd_list);
+
+ ptlrpc_free_rqbd(rqbd);
+ }
+
+ /* wait for all outstanding replies to complete (they were
+ * scheduled having been flagged to abort above) */
+ while (atomic_read(&service->srv_outstanding_replies) != 0) {
+ struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10), NULL, NULL);
+
+ rc = l_wait_event(service->srv_waitq,
+ !list_empty(&service->srv_reply_queue), &lwi);
+ LASSERT(rc == 0 || rc == -ETIMEDOUT);
+
+ if (rc == 0) {
+ ptlrpc_server_handle_reply(service);
+ continue;
+ }
+ CWARN("Unexpectedly long timeout %p\n", service);
+ }
+
+ list_for_each_entry_safe(rs, t, &service->srv_free_rs_list, rs_list) {
+ list_del(&rs->rs_list);
+ OBD_FREE(rs, service->srv_max_reply_size);
+ }
+
+ /* In case somebody rearmed this in the meantime */
+ cfs_timer_disarm(&service->srv_at_timer);
+
+ OBD_FREE_PTR(service);
+ RETURN(0);
+}
+
+/* Returns 0 if the service is healthy.
+ *
+ * Right now, it just checks to make sure that requests aren't languishing
+ * in the queue. We'll use this health check to govern whether a node needs
+ * to be shot, so it's intentionally non-aggressive. */
+int ptlrpc_service_health_check(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request *request;
+ struct timeval right_now;
+ long timediff;
+
+ if (svc == NULL)
+ return 0;
+
+ do_gettimeofday(&right_now);
+
+ spin_lock(&svc->srv_lock);
+ if (list_empty(&svc->srv_request_queue)) {
+ spin_unlock(&svc->srv_lock);
+ return 0;
+ }
+
+ /* How long has the next entry been waiting? */
+ request = list_entry(svc->srv_request_queue.next,
+ struct ptlrpc_request, rq_list);
+ timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
+ spin_unlock(&svc->srv_lock);
+
+ if ((timediff / ONE_MILLION) > (AT_OFF ? obd_timeout * 3/2 :
+ at_max)) {
+ CERROR("%s: unhealthy - request has been waiting %lds\n",
+ svc->srv_name, timediff / ONE_MILLION);
+ return (-1);
+ }
+
+ return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff