X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fptlrpc%2Fservice.c;h=cfb798f0c7ce259ca82eeb22499991377d12146c;hp=fa924fcea4cebb926d438ef372e9ec13da4d25cd;hb=9afee0366ab03c9feba88cc8eb0027aa0fb9bf6b;hpb=b91058999ccd0e34bcc689acd1afdcad24de5590 diff --git a/lustre/ptlrpc/service.c b/lustre/ptlrpc/service.c index fa924fc..cfb798f 100644 --- a/lustre/ptlrpc/service.c +++ b/lustre/ptlrpc/service.c @@ -1,66 +1,83 @@ /* -*- 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 (c) 2002, 2010, Oracle and/or its affiliates. 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 -#include #endif -#include -#include -#include -#include -#include +#include +#include +#include +#include +#include #include "ptlrpc_internal.h" -/* forward ref */ -static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc); +/* 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"); +CFS_MODULE_PARM(at_min, "i", int, 0644, + "Adaptive timeout minimum (sec)"); +CFS_MODULE_PARM(at_max, "i", int, 0644, + "Adaptive timeout maximum (sec)"); +CFS_MODULE_PARM(at_history, "i", int, 0644, + "Adaptive timeouts remember the slowest event that took place " + "within this period (sec)"); +CFS_MODULE_PARM(at_early_margin, "i", int, 0644, + "How soon before an RPC deadline to send an early reply"); +CFS_MODULE_PARM(at_extra, "i", int, 0644, + "How much extra time to give with each early reply"); -static LIST_HEAD (ptlrpc_all_services); -static spinlock_t ptlrpc_all_services_lock = SPIN_LOCK_UNLOCKED; +/* forward ref */ +static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc); -static void -ptlrpc_free_server_req (struct ptlrpc_request *req) -{ - /* The last request to be received into a request buffer uses space - * in the request buffer descriptor, otherwise requests are - * allocated dynamically in the incoming reply event handler */ - if (req == &req->rq_rqbd->rqbd_req) - return; +static CFS_LIST_HEAD(ptlrpc_all_services); +cfs_spinlock_t ptlrpc_all_services_lock; - OBD_FREE(req, sizeof(*req)); -} - static char * ptlrpc_alloc_request_buffer (int size) { char *ptr; - + if (size > SVC_BUF_VMALLOC_THRESHOLD) OBD_VMALLOC(ptr, size); else OBD_ALLOC(ptr, size); - + return (ptr); } @@ -74,66 +91,66 @@ ptlrpc_free_request_buffer (char *ptr, int size) } struct ptlrpc_request_buffer_desc * -ptlrpc_alloc_rqbd (struct ptlrpc_srv_ni *srv_ni) +ptlrpc_alloc_rqbd (struct ptlrpc_service *svc) { - struct ptlrpc_service *svc = srv_ni->sni_service; - unsigned long flags; struct ptlrpc_request_buffer_desc *rqbd; - OBD_ALLOC(rqbd, sizeof (*rqbd)); + OBD_ALLOC_PTR(rqbd); if (rqbd == NULL) return (NULL); - rqbd->rqbd_srv_ni = srv_ni; + 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(rqbd, sizeof (*rqbd)); + OBD_FREE_PTR(rqbd); return (NULL); } - spin_lock_irqsave (&svc->srv_lock, flags); - list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds); + cfs_spin_lock(&svc->srv_lock); + cfs_list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds); svc->srv_nbufs++; - spin_unlock_irqrestore (&svc->srv_lock, flags); + cfs_spin_unlock(&svc->srv_lock); return (rqbd); } void -ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd) +ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd) { - struct ptlrpc_srv_ni *sni = rqbd->rqbd_srv_ni; - struct ptlrpc_service *svc = sni->sni_service; - unsigned long flags; - + struct ptlrpc_service *svc = rqbd->rqbd_service; + LASSERT (rqbd->rqbd_refcount == 0); + LASSERT (cfs_list_empty(&rqbd->rqbd_reqs)); - spin_lock_irqsave(&svc->srv_lock, flags); - list_del(&rqbd->rqbd_list); + cfs_spin_lock(&svc->srv_lock); + cfs_list_del(&rqbd->rqbd_list); svc->srv_nbufs--; - spin_unlock_irqrestore(&svc->srv_lock, flags); + cfs_spin_unlock(&svc->srv_lock); ptlrpc_free_request_buffer (rqbd->rqbd_buffer, svc->srv_buf_size); - OBD_FREE (rqbd, sizeof (*rqbd)); + OBD_FREE_PTR(rqbd); } int -ptlrpc_grow_req_bufs(struct ptlrpc_srv_ni *srv_ni) +ptlrpc_grow_req_bufs(struct ptlrpc_service *svc) { - struct ptlrpc_service *svc = srv_ni->sni_service; 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(srv_ni); + rqbd = ptlrpc_alloc_rqbd(svc); if (rqbd == NULL) { - CERROR ("%s/%s: Can't allocate request buffer\n", - svc->srv_name, srv_ni->sni_ni->pni_name); + CERROR ("%s: Can't allocate request buffer\n", + svc->srv_name); return (-ENOMEM); } @@ -144,132 +161,270 @@ ptlrpc_grow_req_bufs(struct ptlrpc_srv_ni *srv_ni) return (0); } +/** + * Part of Rep-Ack logic. + * Puts a lock and its mode into reply state assotiated to request reply. + */ void -ptlrpc_save_llog_lock(struct ptlrpc_request *req, struct llog_create_locks *lcl) +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; - LASSERT (rs != NULL); - LASSERT (rs->rs_llog_locks == NULL); + int idx; - rs->rs_llog_locks = lcl; + LASSERT(rs != NULL); + LASSERT(rs->rs_nlocks < RS_MAX_LOCKS); + + if (req->rq_export->exp_disconnected) { + ldlm_lock_decref(lock, mode); + } else { + 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_require_repack(struct ptlrpc_request *req) +#ifdef __KERNEL__ + +#define HRT_RUNNING 0 +#define HRT_STOPPING 1 + +struct ptlrpc_hr_thread { + cfs_spinlock_t hrt_lock; + unsigned long hrt_flags; + cfs_waitq_t hrt_wait; + cfs_list_t hrt_queue; + cfs_completion_t hrt_completion; +}; + +struct ptlrpc_hr_service { + int hr_index; + int hr_n_threads; + int hr_size; + struct ptlrpc_hr_thread hr_threads[0]; +}; + +struct rs_batch { + cfs_list_t rsb_replies; + struct ptlrpc_service *rsb_svc; + unsigned int rsb_n_replies; +}; + +/** + * A pointer to per-node reply handling service. + */ +static struct ptlrpc_hr_service *ptlrpc_hr = NULL; + +/** + * maximum mumber of replies scheduled in one batch + */ +#define MAX_SCHEDULED 256 + +/** + * Initialize a reply batch. + * + * \param b batch + */ +static void rs_batch_init(struct rs_batch *b) { - struct ptlrpc_reply_state *rs = req->rq_reply_state; - LASSERT (rs != NULL); - rs->rs_difficult = 1; + memset(b, 0, sizeof *b); + CFS_INIT_LIST_HEAD(&b->rsb_replies); } -void -ptlrpc_save_lock (struct ptlrpc_request *req, - struct lustre_handle *lock, int mode) +/** + * Choose an hr thread to dispatch requests to. + */ +static unsigned int get_hr_thread_index(struct ptlrpc_hr_service *hr) { - struct ptlrpc_reply_state *rs = req->rq_reply_state; - int idx; + unsigned int idx; + + /* Concurrent modification of hr_index w/o any spinlock + protection is harmless as long as the result fits + [0..(hr_n_threads-1)] range and each thread gets near equal + load. */ + idx = hr->hr_index; + hr->hr_index = (idx >= hr->hr_n_threads - 1) ? 0 : idx + 1; + return idx; +} - if (!lock->cookie) - return; +/** + * Dispatch all replies accumulated in the batch to one from + * dedicated reply handling threads. + * + * \param b batch + */ +static void rs_batch_dispatch(struct rs_batch *b) +{ + if (b->rsb_n_replies != 0) { + struct ptlrpc_hr_service *hr = ptlrpc_hr; + int idx; + + idx = get_hr_thread_index(hr); + + cfs_spin_lock(&hr->hr_threads[idx].hrt_lock); + cfs_list_splice_init(&b->rsb_replies, + &hr->hr_threads[idx].hrt_queue); + cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock); + cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait); + b->rsb_n_replies = 0; + } +} + +/** + * Add a reply to a batch. + * Add one reply object to a batch, schedule batched replies if overload. + * + * \param b batch + * \param rs reply + */ +static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs) +{ + struct ptlrpc_service *svc = rs->rs_service; + + if (svc != b->rsb_svc || b->rsb_n_replies >= MAX_SCHEDULED) { + if (b->rsb_svc != NULL) { + rs_batch_dispatch(b); + cfs_spin_unlock(&b->rsb_svc->srv_rs_lock); + } + cfs_spin_lock(&svc->srv_rs_lock); + b->rsb_svc = svc; + } + cfs_spin_lock(&rs->rs_lock); + rs->rs_scheduled_ever = 1; + if (rs->rs_scheduled == 0) { + cfs_list_move(&rs->rs_list, &b->rsb_replies); + rs->rs_scheduled = 1; + b->rsb_n_replies++; + } + rs->rs_committed = 1; + cfs_spin_unlock(&rs->rs_lock); +} + +/** + * Reply batch finalization. + * Dispatch remaining replies from the batch + * and release remaining spinlock. + * + * \param b batch + */ +static void rs_batch_fini(struct rs_batch *b) +{ + if (b->rsb_svc != 0) { + rs_batch_dispatch(b); + cfs_spin_unlock(&b->rsb_svc->srv_rs_lock); + } +} + +#define DECLARE_RS_BATCH(b) struct rs_batch b + +#else /* __KERNEL__ */ + +#define rs_batch_init(b) do{}while(0) +#define rs_batch_fini(b) do{}while(0) +#define rs_batch_add(b, r) ptlrpc_schedule_difficult_reply(r) +#define DECLARE_RS_BATCH(b) + +#endif /* __KERNEL__ */ - LASSERT (rs != NULL); - LASSERT (rs->rs_nlocks < RS_MAX_LOCKS); +/** + * Put reply state into a queue for processing because we received + * ACK from the client + */ +void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs) +{ +#ifdef __KERNEL__ + struct ptlrpc_hr_service *hr = ptlrpc_hr; + int idx; + ENTRY; + + LASSERT(cfs_list_empty(&rs->rs_list)); - idx = rs->rs_nlocks++; - rs->rs_locks[idx] = *lock; - rs->rs_modes[idx] = mode; - rs->rs_difficult = 1; + idx = get_hr_thread_index(hr); + cfs_spin_lock(&hr->hr_threads[idx].hrt_lock); + cfs_list_add_tail(&rs->rs_list, &hr->hr_threads[idx].hrt_queue); + cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock); + cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait); + EXIT; +#else + cfs_list_add_tail(&rs->rs_list, &rs->rs_service->srv_reply_queue); +#endif } void ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs) { - struct ptlrpc_service *svc = rs->rs_srv_ni->sni_service; + ENTRY; -#ifdef CONFIG_SMP - LASSERT (spin_is_locked (&svc->srv_lock)); -#endif + LASSERT_SPIN_LOCKED(&rs->rs_service->srv_rs_lock); + LASSERT_SPIN_LOCKED(&rs->rs_lock); LASSERT (rs->rs_difficult); - rs->rs_scheduled_ever = 1; /* flag any notification attempt */ + rs->rs_scheduled_ever = 1; /* flag any notification attempt */ - if (rs->rs_scheduled) /* being set up or already notified */ + 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); - wake_up (&svc->srv_waitq); + cfs_list_del_init(&rs->rs_list); + ptlrpc_dispatch_difficult_reply(rs); + EXIT; } -void -ptlrpc_commit_replies (struct obd_device *obd) +void ptlrpc_commit_replies(struct obd_export *exp) { - struct list_head *tmp; - struct list_head *nxt; - unsigned long flags; - + struct ptlrpc_reply_state *rs, *nxt; + DECLARE_RS_BATCH(batch); + ENTRY; + + rs_batch_init(&batch); /* Find any replies that have been committed and get their service * to attend to complete them. */ /* CAVEAT EMPTOR: spinlock ordering!!! */ - spin_lock_irqsave (&obd->obd_uncommitted_replies_lock, flags); - - 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); - struct llog_create_locks *lcl = rs->rs_llog_locks; - - rs->rs_llog_locks = NULL; + cfs_spin_lock(&exp->exp_uncommitted_replies_lock); + cfs_list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies, + rs_obd_list) { LASSERT (rs->rs_difficult); - - if (rs->rs_transno <= obd->obd_last_committed) { - struct ptlrpc_service *svc = rs->rs_srv_ni->sni_service; - - spin_lock (&svc->srv_lock); - list_del_init (&rs->rs_obd_list); - ptlrpc_schedule_difficult_reply (rs); - spin_unlock (&svc->srv_lock); - - if (lcl != NULL) - llog_create_lock_free(lcl); + /* VBR: per-export last_committed */ + LASSERT(rs->rs_export); + if (rs->rs_transno <= exp->exp_last_committed) { + cfs_list_del_init(&rs->rs_obd_list); + rs_batch_add(&batch, rs); } } - - spin_unlock_irqrestore (&obd->obd_uncommitted_replies_lock, flags); -} - -static long -timeval_sub(struct timeval *large, struct timeval *small) -{ - return (large->tv_sec - small->tv_sec) * 1000000 + - (large->tv_usec - small->tv_usec); + cfs_spin_unlock(&exp->exp_uncommitted_replies_lock); + rs_batch_fini(&batch); + EXIT; } static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc) { - struct ptlrpc_srv_ni *srv_ni; struct ptlrpc_request_buffer_desc *rqbd; - unsigned long flags; int rc; int posted = 0; for (;;) { - spin_lock_irqsave(&svc->srv_lock, flags); - if (list_empty (&svc->srv_idle_rqbds)) { - spin_unlock_irqrestore(&svc->srv_lock, flags); + cfs_spin_lock(&svc->srv_lock); + + if (cfs_list_empty (&svc->srv_idle_rqbds)) { + cfs_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); + + rqbd = cfs_list_entry(svc->srv_idle_rqbds.next, + struct ptlrpc_request_buffer_desc, + rqbd_list); + cfs_list_del (&rqbd->rqbd_list); /* assume we will post successfully */ - srv_ni = rqbd->rqbd_srv_ni; - srv_ni->sni_nrqbd_receiving++; - list_add (&rqbd->rqbd_list, &srv_ni->sni_active_rqbds); - spin_unlock_irqrestore(&svc->srv_lock, flags); + svc->srv_nrqbd_receiving++; + cfs_list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds); + + cfs_spin_unlock(&svc->srv_lock); rc = ptlrpc_register_rqbd(rqbd); if (rc != 0) @@ -278,99 +433,185 @@ ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc) posted = 1; } + cfs_spin_lock(&svc->srv_lock); - spin_lock_irqsave(&svc->srv_lock, flags); + svc->srv_nrqbd_receiving--; + cfs_list_del(&rqbd->rqbd_list); + cfs_list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds); - srv_ni->sni_nrqbd_receiving--; - list_del(&rqbd->rqbd_list); - list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds); - - if (srv_ni->sni_nrqbd_receiving == 0) { - /* This service is off-air on this interface because all - * its request buffers are busy. Portals will have started - * dropping incoming requests until more buffers get - * posted */ - CERROR("All %s %s request buffers busy\n", - svc->srv_name, srv_ni->sni_ni->pni_name); - } + /* Don't complain if no request buffers are posted right now; LNET + * won't drop requests because we set the portal lazy! */ - spin_unlock_irqrestore (&svc->srv_lock, flags); + cfs_spin_unlock(&svc->srv_lock); return (-1); } +/** + * Start a service with parameters from struct ptlrpc_service_conf \a c + * as opposed to directly calling ptlrpc_init_svc with tons of arguments. + */ +struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c, + svc_handler_t h, char *name, + struct proc_dir_entry *proc_entry, + svc_req_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, NULL); +} +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); +} + +/** + * Initialize service on a given portal. + * This includes starting serving threads , allocating and posting rqbds and + * so on. + * \a nbufs is how many buffers to post + * \a bufsize is buffer size to post + * \a max_req_size - maximum request size to be accepted for this service + * \a max_reply_size maximum reply size this service can ever send + * \a req_portal - portal to listed for requests on + * \a rep_portal - portal of where to send replies to + * \a watchdog_factor soft watchdog timeout multiplifier to print stuck service traces. + * \a handler - function to process every new request + * \a name - service name + * \a proc_entry - entry in the /proc tree for sttistics reporting + * \a min_threads \a max_threads - min/max number of service threads to start. + * \a threadname should be 11 characters or less - 3 will be added on + * \a hp_handler - function to determine priority of the request, also called + * on every new request. + */ struct ptlrpc_service * -ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, - int req_portal, int rep_portal, +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, - struct proc_dir_entry *proc_entry) + cfs_proc_dir_entry_t *proc_entry, + svc_req_printfn_t svcreq_printfn, + int min_threads, int max_threads, + char *threadname, __u32 ctx_tags, + svc_hpreq_handler_t hp_handler) { - int i; - int rc; - int ssize; - struct ptlrpc_service *service; - struct ptlrpc_srv_ni *srv_ni; + int rc; + struct ptlrpc_at_array *array; + struct ptlrpc_service *service; + unsigned int size, index; ENTRY; - LASSERT (ptlrpc_ninterfaces > 0); LASSERT (nbufs > 0); - LASSERT (bufsize >= max_req_size); - - ssize = offsetof (struct ptlrpc_service, - srv_interfaces[ptlrpc_ninterfaces]); - OBD_ALLOC(service, ssize); + LASSERT (bufsize >= max_req_size + SPTLRPC_MAX_PAYLOAD); + LASSERT (ctx_tags != 0); + + OBD_ALLOC_PTR(service); if (service == NULL) RETURN(NULL); - service->srv_name = name; - spin_lock_init(&service->srv_lock); - INIT_LIST_HEAD(&service->srv_threads); - init_waitqueue_head(&service->srv_waitq); + /* First initialise enough for early teardown */ - service->srv_nbuf_per_group = nbufs; - service->srv_max_req_size = max_req_size; + service->srv_name = name; + cfs_spin_lock_init(&service->srv_lock); + cfs_spin_lock_init(&service->srv_rq_lock); + cfs_spin_lock_init(&service->srv_rs_lock); + CFS_INIT_LIST_HEAD(&service->srv_threads); + cfs_waitq_init(&service->srv_waitq); + + 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; service->srv_rep_portal = rep_portal; service->srv_req_portal = req_portal; + service->srv_watchdog_factor = watchdog_factor; service->srv_handler = handler; - - INIT_LIST_HEAD(&service->srv_request_queue); - INIT_LIST_HEAD(&service->srv_idle_rqbds); - INIT_LIST_HEAD(&service->srv_reply_queue); - - /* First initialise enough for early teardown */ - for (i = 0; i < ptlrpc_ninterfaces; i++) { - srv_ni = &service->srv_interfaces[i]; - - srv_ni->sni_service = service; - srv_ni->sni_ni = &ptlrpc_interfaces[i]; - INIT_LIST_HEAD(&srv_ni->sni_active_rqbds); - INIT_LIST_HEAD(&srv_ni->sni_active_replies); - } - - 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, assuming all interfaces require - * the same number. */ - for (i = 0; i < ptlrpc_ninterfaces; i++) { - srv_ni = &service->srv_interfaces[i]; - CDEBUG (D_NET, "%s: initialising interface %s\n", name, - srv_ni->sni_ni->pni_name); - - rc = ptlrpc_grow_req_bufs(srv_ni); - /* 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); - } + service->srv_req_printfn = 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; + service->srv_hpreq_handler = hp_handler; + service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO; + service->srv_hpreq_count = 0; + service->srv_n_active_hpreq = 0; + + rc = LNetSetLazyPortal(service->srv_req_portal); + LASSERT (rc == 0); + + CFS_INIT_LIST_HEAD(&service->srv_request_queue); + CFS_INIT_LIST_HEAD(&service->srv_request_hpq); + 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); +#ifndef __KERNEL__ + CFS_INIT_LIST_HEAD(&service->srv_reply_queue); +#endif + CFS_INIT_LIST_HEAD(&service->srv_free_rs_list); + cfs_waitq_init(&service->srv_free_rs_waitq); + cfs_atomic_set(&service->srv_n_difficult_replies, 0); + + cfs_spin_lock_init(&service->srv_at_lock); + CFS_INIT_LIST_HEAD(&service->srv_req_in_queue); + + array = &service->srv_at_array; + size = at_est2timeout(at_max); + array->paa_size = size; + array->paa_count = 0; + array->paa_deadline = -1; + + /* allocate memory for srv_at_array (ptlrpc_at_array) */ + OBD_ALLOC(array->paa_reqs_array, sizeof(cfs_list_t) * size); + if (array->paa_reqs_array == NULL) + GOTO(failed, NULL); + + for (index = 0; index < size; index++) + CFS_INIT_LIST_HEAD(&array->paa_reqs_array[index]); + + OBD_ALLOC(array->paa_reqs_count, sizeof(__u32) * size); + if (array->paa_reqs_count == NULL) + GOTO(failed, NULL); + + 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); + + cfs_spin_lock (&ptlrpc_all_services_lock); + cfs_list_add (&service->srv_list, &ptlrpc_all_services); + cfs_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 on %d interfaces, listening on portal %d\n", - service->srv_name, ptlrpc_ninterfaces, service->srv_req_portal); + CDEBUG(D_NET, "%s: Started, listening on portal %d\n", + service->srv_name, service->srv_req_portal); RETURN(service); failed: @@ -378,666 +619,2186 @@ failed: return NULL; } -static void -ptlrpc_server_free_request(struct ptlrpc_service *svc, struct ptlrpc_request *req) +/** + * 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) { - unsigned long flags; - int refcount; - - spin_lock_irqsave(&svc->srv_lock, flags); - svc->srv_n_active_reqs--; - refcount = --(req->rq_rqbd->rqbd_refcount); - if (refcount == 0) { - /* request buffer is now idle */ - list_del(&req->rq_rqbd->rqbd_list); - list_add_tail(&req->rq_rqbd->rqbd_list, - &svc->srv_idle_rqbds); + LASSERT(cfs_atomic_read(&req->rq_refcount) == 0); + LASSERT(cfs_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)); } - spin_unlock_irqrestore(&svc->srv_lock, flags); +} + +/** + * increment the number of active requests consuming service threads. + */ +void ptlrpc_server_active_request_inc(struct ptlrpc_request *req) +{ + struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd; + struct ptlrpc_service *svc = rqbd->rqbd_service; - ptlrpc_free_server_req(req); + cfs_spin_lock(&svc->srv_rq_lock); + svc->srv_n_active_reqs++; + cfs_spin_unlock(&svc->srv_rq_lock); } -static char str[PTL_NALFMT_SIZE]; -static int -ptlrpc_server_handle_request (struct ptlrpc_service *svc) +/** + * decrement the number of active requests consuming service threads. + */ +void ptlrpc_server_active_request_dec(struct ptlrpc_request *req) { - struct obd_export *export = NULL; - struct ptlrpc_request *request; - unsigned long flags; - struct timeval work_start; - struct timeval work_end; - long timediff; - int rc; - ENTRY; + struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd; + struct ptlrpc_service *svc = rqbd->rqbd_service; - spin_lock_irqsave (&svc->srv_lock, flags); - if (list_empty (&svc->srv_request_queue) || - (svc->srv_n_difficult_replies != 0 && - svc->srv_n_active_reqs >= (svc->srv_nthreads - 1))) { - /* If all the other threads are handling requests, I must - * remain free to handle any 'difficult' reply that might - * block them */ - spin_unlock_irqrestore (&svc->srv_lock, flags); - RETURN(0); - } + cfs_spin_lock(&svc->srv_rq_lock); + svc->srv_n_active_reqs--; + cfs_spin_unlock(&svc->srv_rq_lock); +} - 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++; +/** + * drop a reference count of the request. if it reaches 0, we either + * put it into history list, or free it immediately. + */ +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; + cfs_list_t *tmp; + cfs_list_t *nxt; - spin_unlock_irqrestore (&svc->srv_lock, flags); + if (!cfs_atomic_dec_and_test(&req->rq_refcount)) + return; - do_gettimeofday(&work_start); - timediff = timeval_sub(&work_start, &request->rq_arrival_time); - if (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); + cfs_spin_lock(&svc->srv_at_lock); + if (req->rq_at_linked) { + struct ptlrpc_at_array *array = &svc->srv_at_array; + __u32 index = req->rq_at_index; + + LASSERT(!cfs_list_empty(&req->rq_timed_list)); + cfs_list_del_init(&req->rq_timed_list); + cfs_spin_lock(&req->rq_lock); + req->rq_at_linked = 0; + cfs_spin_unlock(&req->rq_lock); + array->paa_reqs_count[index]--; + array->paa_count--; + } else + LASSERT(cfs_list_empty(&req->rq_timed_list)); + cfs_spin_unlock(&svc->srv_at_lock); + + /* finalize request */ + if (req->rq_export) { + class_export_put(req->rq_export); + req->rq_export = NULL; } -#if SWAB_PARANOIA - /* Clear request swab mask; this is a new request */ - request->rq_req_swab_mask = 0; -#endif - rc = lustre_unpack_msg (request->rq_reqmsg, request->rq_reqlen); - if (rc != 0) { - CERROR ("error unpacking request: ptl %d from %s" - " xid "LPU64"\n", svc->srv_req_portal, - ptlrpc_peernid2str(&request->rq_peer, str), - request->rq_xid); - goto out; - } + cfs_spin_lock(&svc->srv_lock); - rc = -EINVAL; - if (request->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) { - CERROR("wrong packet type received (type=%u) from %s\n", - request->rq_reqmsg->type, - ptlrpc_peernid2str(&request->rq_peer, str)); - goto out; + cfs_list_add(&req->rq_list, &rqbd->rqbd_reqs); + + refcount = --(rqbd->rqbd_refcount); + if (refcount == 0) { + /* request buffer is now idle: add to history */ + cfs_list_del(&rqbd->rqbd_list); + cfs_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 = cfs_list_entry(svc->srv_history_rqbds.next, + struct ptlrpc_request_buffer_desc, + rqbd_list); + + cfs_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 */ + cfs_list_for_each(tmp, &rqbd->rqbd_reqs) { + req = cfs_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; + cfs_list_del(&req->rq_history_list); + } + + cfs_spin_unlock(&svc->srv_lock); + + cfs_list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) { + req = cfs_list_entry(rqbd->rqbd_reqs.next, + struct ptlrpc_request, + rq_list); + cfs_list_del(&req->rq_list); + ptlrpc_server_free_request(req); + } + + cfs_spin_lock(&svc->srv_lock); + /* + * now all reqs including the embedded req has been + * disposed, schedule request buffer for re-use. + */ + LASSERT(cfs_atomic_read(&rqbd->rqbd_req.rq_refcount) == + 0); + cfs_list_add_tail(&rqbd->rqbd_list, + &svc->srv_idle_rqbds); + } + + cfs_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 */ + cfs_list_del(&req->rq_list); + cfs_list_del_init(&req->rq_history_list); + cfs_spin_unlock(&svc->srv_lock); + + ptlrpc_server_free_request(req); + } else { + cfs_spin_unlock(&svc->srv_lock); } +} - CDEBUG(D_NET, "got req "LPD64"\n", request->rq_xid); +/** + * 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_service *svc, + struct ptlrpc_request *req) +{ + cfs_spin_lock(&svc->srv_rq_lock); + svc->srv_n_active_reqs--; + if (req->rq_hp) + svc->srv_n_active_hpreq--; + cfs_spin_unlock(&svc->srv_rq_lock); - /* Discard requests queued for longer than my timeout. If the - * client's timeout is similar to mine, she'll be timing out this - * REQ anyway (bug 1502) */ - if (timediff / 1000000 > (long)obd_timeout) { - CERROR("Dropping timed-out opc %d request from %s" - ": %ld seconds old\n", request->rq_reqmsg->opc, - ptlrpc_peernid2str(&request->rq_peer, str), - timediff / 1000000); - goto out; + 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, new_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. */ + + /* Do not pay attention on 1sec or smaller renewals. */ + new_time = cfs_time_current_sec() + extra_delay; + if (exp->exp_last_request_time + 1 /*second */ >= new_time) + RETURN_EXIT; + + exp->exp_last_request_time = new_time; + CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n", + exp->exp_client_uuid.uuid, + exp->exp_last_request_time, exp); + + /* exports may get disconnected from the chain even though the + export has references, so we must keep the spin lock while + manipulating the lists */ + cfs_spin_lock(&exp->exp_obd->obd_dev_lock); + + if (cfs_list_empty(&exp->exp_obd_chain_timed)) { + /* this one is not timed */ + cfs_spin_unlock(&exp->exp_obd->obd_dev_lock); + RETURN_EXIT; } - request->rq_export = class_conn2export(&request->rq_reqmsg->handle); + cfs_list_move_tail(&exp->exp_obd_chain_timed, + &exp->exp_obd->obd_exports_timed); - if (request->rq_export) { - if (request->rq_reqmsg->conn_cnt < - request->rq_export->exp_conn_cnt) { - DEBUG_REQ(D_ERROR, request, - "DROPPING req from old connection %d < %d", - request->rq_reqmsg->conn_cnt, - request->rq_export->exp_conn_cnt); - goto put_conn; + oldest_exp = cfs_list_entry(exp->exp_obd->obd_exports_timed.next, + struct obd_export, exp_obd_chain_timed); + oldest_time = oldest_exp->exp_last_request_time; + cfs_spin_unlock(&exp->exp_obd->obd_dev_lock); + + 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(oldest_exp), oldest_time); + } + } 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; } - - export = class_export_rpc_get(request->rq_export); - request->rq_export->exp_last_request_time = - LTIME_S(CURRENT_TIME); } - CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:ni:nid:opc " - "%s:%s+%d:%d:"LPU64":%s:%s:%d\n", current->comm, - (request->rq_export ? - (char *)request->rq_export->exp_client_uuid.uuid : "0"), - (request->rq_export ? - atomic_read(&request->rq_export->exp_refcount) : -99), - request->rq_reqmsg->status, request->rq_xid, - request->rq_peer.peer_ni->pni_name, - ptlrpc_peernid2str(&request->rq_peer, str), - request->rq_reqmsg->opc); - request->rq_svc = svc; - rc = svc->srv_handler(request); - request->rq_svc = NULL; - CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:ni:nid:opc " - "%s:%s+%d:%d:"LPU64":%s:%s:%d\n", current->comm, - (request->rq_export ? - (char *)request->rq_export->exp_client_uuid.uuid : "0"), - (request->rq_export ? - atomic_read(&request->rq_export->exp_refcount) : -99), - request->rq_reqmsg->status, request->rq_xid, - request->rq_peer.peer_ni->pni_name, - ptlrpc_peernid2str(&request->rq_peer, str), - request->rq_reqmsg->opc); + EXIT; +} - if (export != NULL) - class_export_rpc_put(export); +/** + * Sanity check request \a req. + * Return 0 if all is ok, error code otherwise. + */ +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; + } -put_conn: - if (request->rq_export != NULL) - class_export_put(request->rq_export); + return 0; +} - out: - do_gettimeofday(&work_end); +static void ptlrpc_at_set_timer(struct ptlrpc_service *svc) +{ + struct ptlrpc_at_array *array = &svc->srv_at_array; + __s32 next; - timediff = timeval_sub(&work_end, &work_start); + cfs_spin_lock(&svc->srv_at_lock); + if (array->paa_count == 0) { + cfs_timer_disarm(&svc->srv_at_timer); + cfs_spin_unlock(&svc->srv_at_lock); + return; + } - CDEBUG((timediff / 1000000 > (long)obd_timeout) ? D_ERROR : D_HA, - "request "LPU64" opc %u from NID %s processed in %ldus " - "(%ldus total)\n", request->rq_xid, request->rq_reqmsg->opc, - ptlrpc_peernid2str(&request->rq_peer, str), - timediff, timeval_sub(&work_end, &request->rq_arrival_time)); + /* Set timer for closest deadline */ + next = (__s32)(array->paa_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)); + cfs_spin_unlock(&svc->srv_at_lock); + CDEBUG(D_INFO, "armed %s at %+ds\n", svc->srv_name, next); +} - if (svc->srv_stats != NULL) { - int opc = opcode_offset(request->rq_reqmsg->opc); - if (opc > 0) { - LASSERT(opc < LUSTRE_MAX_OPCODES); - lprocfs_counter_add(svc->srv_stats, - opc + PTLRPC_LAST_CNTR, - timediff); +/* 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 = NULL; + struct ptlrpc_at_array *array = &svc->srv_at_array; + __u32 index; + 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); + + cfs_spin_lock(&svc->srv_at_lock); + LASSERT(cfs_list_empty(&req->rq_timed_list)); + + index = (unsigned long)req->rq_deadline % array->paa_size; + if (array->paa_reqs_count[index] > 0) { + /* latest rpcs will have the latest deadlines in the list, + * so search backward. */ + cfs_list_for_each_entry_reverse(rq, + &array->paa_reqs_array[index], + rq_timed_list) { + if (req->rq_deadline >= rq->rq_deadline) { + cfs_list_add(&req->rq_timed_list, + &rq->rq_timed_list); + break; + } } } - ptlrpc_server_free_request(svc, request); - - RETURN(1); + /* Add the request at the head of the list */ + if (cfs_list_empty(&req->rq_timed_list)) + cfs_list_add(&req->rq_timed_list, + &array->paa_reqs_array[index]); + + cfs_spin_lock(&req->rq_lock); + req->rq_at_linked = 1; + cfs_spin_unlock(&req->rq_lock); + req->rq_at_index = index; + array->paa_reqs_count[index]++; + array->paa_count++; + if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) { + array->paa_deadline = req->rq_deadline; + found = 1; + } + cfs_spin_unlock(&svc->srv_at_lock); + + if (found) + ptlrpc_at_set_timer(svc); + + return 0; } -static int -ptlrpc_server_handle_reply (struct ptlrpc_service *svc) +static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req) { - struct ptlrpc_reply_state *rs; - unsigned long flags; - struct obd_export *exp; - struct obd_device *obd; - struct llog_create_locks *lcl; - int nlocks; - int been_handled; + 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; - spin_lock_irqsave (&svc->srv_lock, flags); - if (list_empty (&svc->srv_reply_queue)) { - spin_unlock_irqrestore (&svc->srv_lock, flags); + /* 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), at_extra); + + if (AT_OFF) RETURN(0); + + 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); + + /* Return an error so we're not re-added to the timed list. */ + RETURN(-ETIMEDOUT); } - - rs = list_entry (svc->srv_reply_queue.next, - struct ptlrpc_reply_state, rs_list); - exp = rs->rs_export; - obd = exp->exp_obd; + 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); + } - LASSERT (rs->rs_difficult); - LASSERT (rs->rs_scheduled); + if (req->rq_export && + lustre_msg_get_flags(req->rq_reqmsg) & + (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) { + /* During recovery, we don't want to send too many early + * replies, but on the other hand we want to make sure the + * client has enough time to resend if the rpc is lost. So + * during the recovery period send at least 4 early replies, + * spacing them every at_extra if we can. at_estimate should + * always equal this fixed value during recovery. */ + at_measured(&svc->srv_at_estimate, min(at_extra, + req->rq_export->exp_obd->obd_recovery_timeout / 4)); + } else { + /* Fake our processing time into the future to ask the clients + * for some extra amount of time */ + at_measured(&svc->srv_at_estimate, at_extra + + cfs_time_current_sec() - + req->rq_arrival_time.tv_sec); + + /* Check to see if we've actually increased the deadline - + * we may be past adaptive_max */ + if (req->rq_deadline >= req->rq_arrival_time.tv_sec + + at_get(&svc->srv_at_estimate)) { + DEBUG_REQ(D_WARNING, req, "Couldn't add any time " + "(%ld/%ld), not sending early reply\n", + olddl, req->rq_arrival_time.tv_sec + + at_get(&svc->srv_at_estimate) - + cfs_time_current_sec()); + RETURN(-ETIMEDOUT); + } + } + newdl = cfs_time_current_sec() + at_get(&svc->srv_at_estimate); - list_del_init (&rs->rs_list); + 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); + } - /* Disengage from notifiers carefully (lock ordering!) */ - spin_unlock(&svc->srv_lock); + *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); + + LASSERT(cfs_atomic_read(&req->rq_refcount)); + /** if it is last refcount then early reply isn't needed */ + if (cfs_atomic_read(&req->rq_refcount) == 1) { + DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, " + "abort sending early reply\n"); + GOTO(out, rc = -EINVAL); + } - 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); + /* Connection ref */ + reqcopy->rq_export = class_conn2export( + lustre_msg_get_handle(reqcopy->rq_reqmsg)); + if (reqcopy->rq_export == NULL) + GOTO(out, rc = -ENODEV); + + /* 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); + + rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY); + if (rc) + GOTO(out_put, rc); + + 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 { + DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc); + } - spin_lock (&exp->exp_lock); - /* Noop if removed already */ - list_del_init (&rs->rs_exp_list); - spin_unlock (&exp->exp_lock); + /* 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); +} - spin_lock(&svc->srv_lock); +/* 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; + cfs_list_t work_list; + struct ptlrpc_at_array *array = &svc->srv_at_array; + __u32 index, count; + time_t deadline; + time_t now = cfs_time_current_sec(); + cfs_duration_t delay; + int first, counter = 0; + ENTRY; - 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! */ + cfs_spin_lock(&svc->srv_at_lock); + if (svc->srv_at_check == 0) { + cfs_spin_unlock(&svc->srv_at_lock); + RETURN(0); + } + delay = cfs_time_sub(cfs_time_current(), svc->srv_at_checktime); + svc->srv_at_check = 0; - lcl = rs->rs_llog_locks; - rs->rs_llog_locks = NULL; + if (array->paa_count == 0) { + cfs_spin_unlock(&svc->srv_at_lock); + RETURN(0); + } - if (nlocks == 0 && !been_handled) { - /* If we see this, we should already have seen the warning - * in mds_steal_ack_locks() */ -#if 0 - char str[PTL_NALFMT_SIZE]; - /* CMD may ask to save request with no DLM locks -bzzz */ - CWARN("All locks stolen from rs %p x"LPD64".t"LPD64 - " o%d NID %s\n", - rs, - rs->rs_xid, rs->rs_transno, - rs->rs_msg.opc, - ptlrpc_peernid2str(&exp->exp_connection->c_peer, str)); -#endif + /* The timer went off, but maybe the nearest rpc already completed. */ + first = array->paa_deadline - now; + if (first > at_early_margin) { + /* We've still got plenty of time. Reset the timer. */ + cfs_spin_unlock(&svc->srv_at_lock); + ptlrpc_at_set_timer(svc); + RETURN(0); } - if ((!been_handled && rs->rs_on_net) || - nlocks > 0 || lcl != NULL) { - spin_unlock_irqrestore(&svc->srv_lock, flags); - - if (!been_handled && rs->rs_on_net) { - PtlMDUnlink(rs->rs_md_h); - /* Ignore return code; we're racing with - * completion... */ + /* 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); + deadline = -1; + index = (unsigned long)array->paa_deadline % array->paa_size; + count = array->paa_count; + while (count > 0) { + count -= array->paa_reqs_count[index]; + cfs_list_for_each_entry_safe(rq, n, + &array->paa_reqs_array[index], + rq_timed_list) { + if (rq->rq_deadline <= now + at_early_margin) { + cfs_list_del_init(&rq->rq_timed_list); + /** + * ptlrpc_server_drop_request() may drop + * refcount to 0 already. Let's check this and + * don't add entry to work_list + */ + if (likely(cfs_atomic_inc_not_zero(&rq->rq_refcount))) + cfs_list_add(&rq->rq_timed_list, &work_list); + counter++; + array->paa_reqs_count[index]--; + array->paa_count--; + cfs_spin_lock(&rq->rq_lock); + rq->rq_at_linked = 0; + cfs_spin_unlock(&rq->rq_lock); + continue; + } + + /* update the earliest deadline */ + if (deadline == -1 || rq->rq_deadline < deadline) + deadline = rq->rq_deadline; + + break; } - while (nlocks-- > 0) - ldlm_lock_decref(&rs->rs_locks[nlocks], - rs->rs_modes[nlocks]); + if (++index >= array->paa_size) + index = 0; + } + array->paa_deadline = deadline; + cfs_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); + } + + /* we took additional refcount so entries can't be deleted from list, no + * locking is needed */ + while (!cfs_list_empty(&work_list)) { + rq = cfs_list_entry(work_list.next, struct ptlrpc_request, + rq_timed_list); + cfs_list_del_init(&rq->rq_timed_list); - if (lcl != NULL) - llog_create_lock_free(lcl); + if (ptlrpc_at_send_early_reply(rq) == 0) + ptlrpc_at_add_timed(rq); - spin_lock_irqsave(&svc->srv_lock, flags); + ptlrpc_server_drop_request(rq); } - rs->rs_scheduled = 0; + RETURN(0); +} - if (!rs->rs_on_net) { +/** + * Put the request to the export list if the request may become + * a high priority one. + */ +static int ptlrpc_hpreq_init(struct ptlrpc_service *svc, + struct ptlrpc_request *req) +{ + int rc; + ENTRY; + + if (svc->srv_hpreq_handler) { + rc = svc->srv_hpreq_handler(req); + if (rc) + RETURN(rc); + } + if (req->rq_export && req->rq_ops) { + cfs_spin_lock_bh(&req->rq_export->exp_rpc_lock); + cfs_list_add(&req->rq_exp_list, + &req->rq_export->exp_queued_rpc); + cfs_spin_unlock_bh(&req->rq_export->exp_rpc_lock); + } + + RETURN(0); +} + +/** Remove the request from the export list. */ +static void ptlrpc_hpreq_fini(struct ptlrpc_request *req) +{ + ENTRY; + if (req->rq_export && req->rq_ops) { + cfs_spin_lock_bh(&req->rq_export->exp_rpc_lock); + cfs_list_del_init(&req->rq_exp_list); + cfs_spin_unlock_bh(&req->rq_export->exp_rpc_lock); + } + EXIT; +} + +/** + * Make the request a high priority one. + * + * All the high priority requests are queued in a separate FIFO + * ptlrpc_service::srv_request_hpq list which is parallel to + * ptlrpc_service::srv_request_queue list but has a higher priority + * for handling. + * + * \see ptlrpc_server_handle_request(). + */ +static void ptlrpc_hpreq_reorder_nolock(struct ptlrpc_service *svc, + struct ptlrpc_request *req) +{ + ENTRY; + LASSERT(svc != NULL); + cfs_spin_lock(&req->rq_lock); + if (req->rq_hp == 0) { + int opc = lustre_msg_get_opc(req->rq_reqmsg); + + /* Add to the high priority queue. */ + cfs_list_move_tail(&req->rq_list, &svc->srv_request_hpq); + req->rq_hp = 1; + if (opc != OBD_PING) + DEBUG_REQ(D_NET, req, "high priority req"); + } + cfs_spin_unlock(&req->rq_lock); + EXIT; +} + +/** + * \see ptlrpc_hpreq_reorder_nolock + */ +void ptlrpc_hpreq_reorder(struct ptlrpc_request *req) +{ + struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service; + ENTRY; + + cfs_spin_lock(&svc->srv_rq_lock); + /* It may happen that the request is already taken for the processing + * but still in the export list, do not re-add it into the HP list. */ + if (req->rq_phase == RQ_PHASE_NEW) + ptlrpc_hpreq_reorder_nolock(svc, req); + cfs_spin_unlock(&svc->srv_rq_lock); + EXIT; +} + +/** Check if the request is a high priority one. */ +static int ptlrpc_server_hpreq_check(struct ptlrpc_request *req) +{ + int opc, rc = 0; + ENTRY; + + /* Check by request opc. */ + opc = lustre_msg_get_opc(req->rq_reqmsg); + if (opc == OBD_PING) + RETURN(1); + + /* Perform request specific check. */ + if (req->rq_ops && req->rq_ops->hpreq_check) + rc = req->rq_ops->hpreq_check(req); + RETURN(rc); +} + +/** Check if a request is a high priority one. */ +static int ptlrpc_server_request_add(struct ptlrpc_service *svc, + struct ptlrpc_request *req) +{ + int rc; + ENTRY; + + rc = ptlrpc_server_hpreq_check(req); + if (rc < 0) + RETURN(rc); + + cfs_spin_lock(&svc->srv_rq_lock); + /* Before inserting the request into the queue, check if it is not + * inserted yet, or even already handled -- it may happen due to + * a racing ldlm_server_blocking_ast(). */ + if (req->rq_phase == RQ_PHASE_NEW && cfs_list_empty(&req->rq_list)) { + if (rc) + ptlrpc_hpreq_reorder_nolock(svc, req); + else + cfs_list_add_tail(&req->rq_list, + &svc->srv_request_queue); + } + cfs_spin_unlock(&svc->srv_rq_lock); + + RETURN(0); +} + +/** + * Allow to handle high priority request + * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock + * to get reliable result + */ +static int ptlrpc_server_allow_high(struct ptlrpc_service *svc, int force) +{ + if (force) + return 1; + + if (svc->srv_n_active_reqs >= svc->srv_threads_running - 1) + return 0; + + return cfs_list_empty(&svc->srv_request_queue) || + svc->srv_hpreq_count < svc->srv_hpreq_ratio; +} + +static int ptlrpc_server_high_pending(struct ptlrpc_service *svc, int force) +{ + return ptlrpc_server_allow_high(svc, force) && + !cfs_list_empty(&svc->srv_request_hpq); +} + +/** + * Only allow normal priority requests on a service that has a high-priority + * queue if forced (i.e. cleanup), if there are other high priority requests + * already being processed (i.e. those threads can service more high-priority + * requests), or if there are enough idle threads that a later thread can do + * a high priority request. + * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock + * to get reliable result + */ +static int ptlrpc_server_allow_normal(struct ptlrpc_service *svc, int force) +{ + if (force || + svc->srv_n_active_reqs < svc->srv_threads_running - 2) + return 1; + + if (svc->srv_n_active_reqs >= svc->srv_threads_running - 1) + return 0; + + return svc->srv_n_active_hpreq > 0 || svc->srv_hpreq_handler == NULL; +} + +static int ptlrpc_server_normal_pending(struct ptlrpc_service *svc, int force) +{ + return ptlrpc_server_allow_normal(svc, force) && + !cfs_list_empty(&svc->srv_request_queue); +} + +/** + * Returns true if there are requests available in incoming + * request queue for processing and it is allowed to fetch them. + * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock + * to get reliable result + * \see ptlrpc_server_allow_normal + * \see ptlrpc_server_allow high + */ +static inline int +ptlrpc_server_request_pending(struct ptlrpc_service *svc, int force) +{ + return ptlrpc_server_high_pending(svc, force) || + ptlrpc_server_normal_pending(svc, force); +} + +/** + * Fetch a request for processing from queue of unprocessed requests. + * Favors high-priority requests. + * Returns a pointer to fetched request. + */ +static struct ptlrpc_request * +ptlrpc_server_request_get(struct ptlrpc_service *svc, int force) +{ + struct ptlrpc_request *req; + ENTRY; + + if (ptlrpc_server_high_pending(svc, force)) { + req = cfs_list_entry(svc->srv_request_hpq.next, + struct ptlrpc_request, rq_list); + svc->srv_hpreq_count++; + RETURN(req); + + } + + if (ptlrpc_server_normal_pending(svc, force)) { + req = cfs_list_entry(svc->srv_request_queue.next, + struct ptlrpc_request, rq_list); + svc->srv_hpreq_count = 0; + RETURN(req); + } + RETURN(NULL); +} + +/** + * Handle freshly incoming reqs, add to timed early reply list, + * pass on to regular request queue. + * All incoming requests pass through here before getting into + * ptlrpc_server_handle_req later on. + */ +static int +ptlrpc_server_handle_req_in(struct ptlrpc_service *svc) +{ + struct ptlrpc_request *req; + __u32 deadline; + int rc; + ENTRY; + + LASSERT(svc); + + cfs_spin_lock(&svc->srv_lock); + if (cfs_list_empty(&svc->srv_req_in_queue)) { + cfs_spin_unlock(&svc->srv_lock); + RETURN(0); + } + + req = cfs_list_entry(svc->srv_req_in_queue.next, + struct ptlrpc_request, rq_list); + cfs_list_del_init (&req->rq_list); + svc->srv_n_queued_reqs--; + /* Consider this still a "queued" request as far as stats are + concerned */ + /* ptlrpc_hpreq_init() inserts it to the export list and by the time + * of ptlrpc_server_request_add() it could be already handled and + * released. To not lose request in between, take an extra reference + * on the request. */ + ptlrpc_request_addref(req); + cfs_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(); + } + + /* + * for null-flavored rpc, msg has been unpacked by sptlrpc, although + * redo it wouldn't be harmful. + */ + if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) { + rc = ptlrpc_unpack_req_msg(req, 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; + } + + if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) && + lustre_msg_get_opc(req->rq_reqmsg) == obd_fail_val) { + CERROR("drop incoming rpc opc %u, x"LPU64"\n", + obd_fail_val, 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; + } + + switch(lustre_msg_get_opc(req->rq_reqmsg)) { + case MDS_WRITEPAGE: + case OST_WRITE: + req->rq_bulk_write = 1; + break; + case MDS_READPAGE: + case OST_READ: + req->rq_bulk_read = 1; + break; + } + + CDEBUG(D_NET, "got req "LPU64"\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,"); + } + + if (rc) + goto err_req; + ptlrpc_update_export_timer(req->rq_export, 0); + } + + /* 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); + rc = ptlrpc_hpreq_init(svc, req); + if (rc) + GOTO(err_req, rc); + + /* Move it over to the request processing queue */ + rc = ptlrpc_server_request_add(svc, req); + if (rc) + GOTO(err_req, rc); + cfs_waitq_signal(&svc->srv_waitq); + ptlrpc_server_drop_request(req); + RETURN(1); + +err_req: + ptlrpc_server_drop_request(req); + cfs_spin_lock(&svc->srv_rq_lock); + svc->srv_n_active_reqs++; + cfs_spin_unlock(&svc->srv_rq_lock); + ptlrpc_server_finish_request(svc, req); + + RETURN(1); +} + +/** + * Main incoming request handling logic. + * Calls handler function from service to do actual processing. + */ +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 opc, rc; + int fail_opc = 0; + ENTRY; + + LASSERT(svc); + + cfs_spin_lock(&svc->srv_rq_lock); +#ifndef __KERNEL__ + /* !@%$# liblustre only has 1 thread */ + if (cfs_atomic_read(&svc->srv_n_difficult_replies) != 0) { + cfs_spin_unlock(&svc->srv_rq_lock); + RETURN(0); + } +#endif + request = ptlrpc_server_request_get(svc, 0); + if (request == NULL) { + cfs_spin_unlock(&svc->srv_rq_lock); + RETURN(0); + } + + opc = lustre_msg_get_opc(request->rq_reqmsg); + if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT)) + fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT; + else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT)) + fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT; + + if (unlikely(fail_opc)) { + if (request->rq_export && request->rq_ops) { + cfs_spin_unlock(&svc->srv_rq_lock); + OBD_FAIL_TIMEOUT(fail_opc, 4); + cfs_spin_lock(&svc->srv_rq_lock); + request = ptlrpc_server_request_get(svc, 0); + if (request == NULL) { + cfs_spin_unlock(&svc->srv_rq_lock); + RETURN(0); + } + } + } + + cfs_list_del_init(&request->rq_list); + svc->srv_n_active_reqs++; + if (request->rq_hp) + svc->srv_n_active_hpreq++; + + /* The phase is changed under the lock here because we need to know + * the request is under processing (see ptlrpc_hpreq_reorder()). */ + ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET); + cfs_spin_unlock(&svc->srv_rq_lock); + + ptlrpc_hpreq_fini(request); + + if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG)) + libcfs_debug_dumplog(); + + cfs_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|LCT_REMEMBER|LCT_NOREF); + if (rc) { + CERROR("Failure to initialize session: %d\n", rc); + goto out_req; + } + request->rq_session.lc_thread = thread; + request->rq_session.lc_cookie = 0x5; + 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; + + 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; + } + + 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 ? + cfs_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)); + + if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING) + OBD_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, obd_fail_val); + + rc = svc->srv_handler(request); + + ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE); + +put_rpc_export: + if (export != NULL) + class_export_rpc_put(export); +put_conn: + 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)); + } + + cfs_gettimeofday(&work_end); + timediff = cfs_timeval_sub(&work_end, &work_start, NULL); + CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc " + "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in " + "%ldus (%ldus total) trans "LPU64" rc %d/%d\n", + cfs_curproc_comm(), + (request->rq_export ? + (char *)request->rq_export->exp_client_uuid.uuid : "0"), + (request->rq_export ? + cfs_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), + 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(svc, request); + + RETURN(1); +} + +/** + * An internal function to process a single reply state object. + */ +static int +ptlrpc_handle_rs (struct ptlrpc_reply_state *rs) +{ + struct ptlrpc_service *svc = rs->rs_service; + struct obd_export *exp; + struct obd_device *obd; + int nlocks; + int been_handled; + ENTRY; + + exp = rs->rs_export; + obd = exp->exp_obd; + + LASSERT (rs->rs_difficult); + LASSERT (rs->rs_scheduled); + LASSERT (cfs_list_empty(&rs->rs_list)); + + cfs_spin_lock (&exp->exp_lock); + /* Noop if removed already */ + cfs_list_del_init (&rs->rs_exp_list); + cfs_spin_unlock (&exp->exp_lock); + + /* The disk commit callback holds exp_uncommitted_replies_lock while it + * iterates over newly committed replies, removing them from + * exp_uncommitted_replies. It then drops this lock and schedules the + * replies it found for handling here. + * + * We can avoid contention for exp_uncommitted_replies_lock between the + * HRT threads and further commit callbacks by checking rs_committed + * which is set in the commit callback while it holds both + * rs_lock and exp_uncommitted_reples. + * + * If we see rs_committed clear, the commit callback _may_ not have + * handled this reply yet and we race with it to grab + * exp_uncommitted_replies_lock before removing the reply from + * exp_uncommitted_replies. Note that if we lose the race and the + * reply has already been removed, list_del_init() is a noop. + * + * If we see rs_committed set, we know the commit callback is handling, + * or has handled this reply since store reordering might allow us to + * see rs_committed set out of sequence. But since this is done + * holding rs_lock, we can be sure it has all completed once we hold + * rs_lock, which we do right next. + */ + if (!rs->rs_committed) { + cfs_spin_lock(&exp->exp_uncommitted_replies_lock); + cfs_list_del_init(&rs->rs_obd_list); + cfs_spin_unlock(&exp->exp_uncommitted_replies_lock); + } + + cfs_spin_lock(&rs->rs_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, rs->rs_opc, + libcfs_nid2str(exp->exp_connection->c_peer.nid)); + } + + if ((!been_handled && rs->rs_on_net) || nlocks > 0) { + cfs_spin_unlock(&rs->rs_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]); + + cfs_spin_lock(&rs->rs_lock); + } + + rs->rs_scheduled = 0; + + if (!rs->rs_on_net) { /* Off the net */ - svc->srv_n_difficult_replies--; - spin_unlock_irqrestore(&svc->srv_lock, flags); - + cfs_spin_unlock(&rs->rs_lock); + class_export_put (exp); rs->rs_export = NULL; - lustre_free_reply_state (rs); - atomic_dec (&svc->srv_outstanding_replies); + ptlrpc_rs_decref (rs); + if (cfs_atomic_dec_and_test(&svc->srv_n_difficult_replies) && + svc->srv_is_stopping) + cfs_waitq_broadcast(&svc->srv_waitq); RETURN(1); } - + /* still on the net; callback will schedule */ - spin_unlock_irqrestore (&svc->srv_lock, flags); + cfs_spin_unlock(&rs->rs_lock); RETURN(1); } #ifndef __KERNEL__ + +/** + * Check whether given service has a reply available for processing + * and process it. + * + * \param svc a ptlrpc service + * \retval 0 no replies processed + * \retval 1 one reply processed + */ +static int +ptlrpc_server_handle_reply(struct ptlrpc_service *svc) +{ + struct ptlrpc_reply_state *rs = NULL; + ENTRY; + + cfs_spin_lock(&svc->srv_rs_lock); + if (!cfs_list_empty(&svc->srv_reply_queue)) { + rs = cfs_list_entry(svc->srv_reply_queue.prev, + struct ptlrpc_reply_state, + rs_list); + cfs_list_del_init(&rs->rs_list); + } + cfs_spin_unlock(&svc->srv_rs_lock); + if (rs != NULL) + ptlrpc_handle_rs(rs); + RETURN(rs != NULL); +} + /* FIXME make use of timeout later */ int -liblustre_check_services (void *arg) +liblustre_check_services (void *arg) { int did_something = 0; int rc; - struct list_head *tmp, *nxt; + cfs_list_t *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) { + cfs_list_for_each_safe (tmp, nxt, &ptlrpc_all_services) { struct ptlrpc_service *svc = - list_entry (tmp, struct ptlrpc_service, srv_list); - - if (svc->srv_nthreads != 0) /* I've recursed */ + cfs_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_nthreads++; - + + svc->srv_threads_running++; + do { - rc = ptlrpc_server_handle_reply(svc); - rc |= ptlrpc_server_handle_request(svc); + 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_nthreads--; + + 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(void) -{ - exit_mm(current); - lustre_daemonize_helper(); - exit_files(current); - reparent_to_init(); -} - static void -ptlrpc_check_rqbd_pools(struct ptlrpc_service *svc) +ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc) { - struct ptlrpc_srv_ni *sni; - int i; - int avail = 0; - int low_water = svc->srv_nbuf_per_group/2; + int avail = svc->srv_nrqbd_receiving; + int low_water = test_req_buffer_pressure ? 0 : + svc->srv_nbuf_per_group/2; - for (i = 0; i < ptlrpc_ninterfaces; i++) { - sni = &svc->srv_interfaces[i]; + /* NB I'm not locking; just looking. */ - avail += sni->sni_nrqbd_receiving; - /* NB I'm not locking; just looking. */ - if (sni->sni_nrqbd_receiving <= low_water) - ptlrpc_grow_req_bufs(sni); - } + /* 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. */ - lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR, avail); + 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 inline int +ptlrpc_threads_enough(struct ptlrpc_service *svc) +{ + return svc->srv_n_active_reqs < + svc->srv_threads_running - 1 - (svc->srv_hpreq_handler != NULL); +} + +/** + * allowed to create more threads + * user can call it w/o any lock but need to hold ptlrpc_service::srv_lock to + * get reliable result + */ +static inline int +ptlrpc_threads_increasable(struct ptlrpc_service *svc) +{ + return svc->srv_threads_running + + svc->srv_threads_starting < svc->srv_threads_max; +} + +/** + * too many requests and allowed to create more threads + */ +static inline int +ptlrpc_threads_need_create(struct ptlrpc_service *svc) +{ + return !ptlrpc_threads_enough(svc) && ptlrpc_threads_increasable(svc); +} + +static inline int +ptlrpc_thread_stopping(struct ptlrpc_thread *thread) +{ + return (thread->t_flags & SVC_STOPPING) != 0 || + thread->t_svc->srv_is_stopping; +} + +static inline int +ptlrpc_rqbd_pending(struct ptlrpc_service *svc) +{ + return !cfs_list_empty(&svc->srv_idle_rqbds) && + svc->srv_rqbd_timeout == 0; +} + +static inline int +ptlrpc_at_check(struct ptlrpc_service *svc) +{ + return svc->srv_at_check; +} + +/** + * requests wait on preprocessing + * user can call it w/o any lock but need to hold ptlrpc_service::srv_lock to + * get reliable result + */ +static inline int +ptlrpc_server_request_waiting(struct ptlrpc_service *svc) +{ + return !cfs_list_empty(&svc->srv_req_in_queue); +} + +/** + * Main thread body for service threads. + * Waits in a loop waiting for new requests to process to appear. + * Every time an incoming requests is added to its queue, a waitq + * is woken up and one of the threads will handle it. + */ static int ptlrpc_main(void *arg) { struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg; struct ptlrpc_service *svc = data->svc; struct ptlrpc_thread *thread = data->thread; - unsigned long flags; + struct ptlrpc_reply_state *rs; +#ifdef WITH_GROUP_INFO + cfs_group_info_t *ginfo = NULL; +#endif + struct lu_env env; + int counter = 0, rc = 0; ENTRY; - lock_kernel(); - ptlrpc_daemonize(); + thread->t_pid = cfs_curproc_pid(); + cfs_daemonize_ctxt(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 < cfs_num_possible_cpus(); + cpu++) { + if (!cfs_cpu_online(cpu)) + continue; + if (num_cpu == thread->t_id % cfs_num_online_cpus()) + break; + num_cpu++; + } + cfs_set_cpus_allowed(cfs_current(), + node_to_cpumask(cpu_to_node(cpu))); + } +#endif + +#ifdef WITH_GROUP_INFO + ginfo = cfs_groups_alloc(0); + if (!ginfo) { + rc = -ENOMEM; + goto out; + } + + cfs_set_current_groups(ginfo); + cfs_put_group_info(ginfo); +#endif - SIGNAL_MASK_LOCK(current, flags); - sigfillset(¤t->blocked); - RECALC_SIGPENDING; - SIGNAL_MASK_UNLOCK(current, flags); + 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|LCT_REMEMBER|LCT_NOREF); + if (rc) + goto out_srv_fini; - 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(); + thread->t_env = &env; + env.le_ctx.lc_thread = thread; + env.le_ctx.lc_cookie = 0x6; - /* Record that the thread is running */ - thread->t_flags = SVC_RUNNING; - wake_up(&thread->t_ctl_waitq); + /* 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; + } - spin_lock_irqsave(&svc->srv_lock, flags); - svc->srv_nthreads++; - spin_unlock_irqrestore(&svc->srv_lock, flags); + cfs_spin_lock(&svc->srv_lock); - /* XXX maintain a list of all managed devices: insert here */ + LASSERT((thread->t_flags & SVC_STARTING) != 0); + thread->t_flags &= ~SVC_STARTING; + svc->srv_threads_starting--; - while ((thread->t_flags & SVC_STOPPING) == 0 || - svc->srv_n_difficult_replies != 0) { + /* SVC_STOPPING may already be set here if someone else is trying + * to stop the service while this new thread has been dynamically + * forked. We still set SVC_RUNNING to let our creator know that + * we are now running, however we will exit as soon as possible */ + thread->t_flags |= SVC_RUNNING; + svc->srv_threads_running++; + cfs_spin_unlock(&svc->srv_lock); + + /* + * 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); + + thread->t_watchdog = lc_watchdog_add(CFS_GET_TIMEOUT(svc), NULL, NULL); + + cfs_spin_lock(&svc->srv_rs_lock); + cfs_list_add(&rs->rs_list, &svc->srv_free_rs_list); + cfs_waitq_signal(&svc->srv_free_rs_waitq); + cfs_spin_unlock(&svc->srv_rs_lock); + + 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 */ + while (!ptlrpc_thread_stopping(thread)) { /* 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); - 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_reply_queue) || - (!list_empty (&svc->srv_request_queue) && - (svc->srv_n_difficult_replies == 0 || - svc->srv_n_active_reqs < - (svc->srv_nthreads - 1))), - &lwi); - - ptlrpc_check_rqbd_pools(svc); - - if (!list_empty (&svc->srv_reply_queue)) - ptlrpc_server_handle_reply (svc); - - /* only handle requests if there are no difficult replies - * outstanding, or I'm not the last thread handling - * requests */ - if (!list_empty (&svc->srv_request_queue) && - (svc->srv_n_difficult_replies == 0 || - svc->srv_n_active_reqs < (svc->srv_nthreads - 1))) - ptlrpc_server_handle_request (svc); - - if (!list_empty(&svc->srv_idle_rqbds) && + lc_watchdog_disable(thread->t_watchdog); + + cfs_cond_resched(); + + l_wait_event_exclusive_head(svc->srv_waitq, + ptlrpc_thread_stopping(thread) || + ptlrpc_server_request_waiting(svc) || + ptlrpc_server_request_pending(svc, 0) || + ptlrpc_rqbd_pending(svc) || + ptlrpc_at_check(svc), &lwi); + + if (ptlrpc_thread_stopping(thread)) + break; + + lc_watchdog_touch(thread->t_watchdog, CFS_GET_TIMEOUT(svc)); + + ptlrpc_check_rqbd_pool(svc); + + if (ptlrpc_threads_need_create(svc)) { + /* Ignore return code - we tried... */ + ptlrpc_start_thread(svc); + } + + /* Process all incoming reqs before handling any */ + if (ptlrpc_server_request_waiting(svc)) { + ptlrpc_server_handle_req_in(svc); + /* but limit ourselves in case of flood */ + if (counter++ < 100) + continue; + counter = 0; + } + + if (ptlrpc_at_check(svc)) + ptlrpc_at_check_timed(svc); + + if (ptlrpc_server_request_pending(svc, 0)) { + lu_context_enter(&env.le_ctx); + ptlrpc_server_handle_request(svc, thread); + lu_context_exit(&env.le_ctx); + } + + if (ptlrpc_rqbd_pending(svc) && 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 = HZ/10; + /* 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); } } - spin_lock_irqsave(&svc->srv_lock, flags); + lc_watchdog_delete(thread->t_watchdog); + thread->t_watchdog = NULL; - svc->srv_nthreads--; /* must know immediately */ - thread->t_flags = SVC_STOPPED; - wake_up(&thread->t_ctl_waitq); +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_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n", + thread, thread->t_pid, thread->t_id, rc); + + cfs_spin_lock(&svc->srv_lock); + if ((thread->t_flags & SVC_STARTING) != 0) { + svc->srv_threads_starting--; + thread->t_flags &= ~SVC_STARTING; + } + + if ((thread->t_flags & SVC_RUNNING) != 0) { + /* must know immediately */ + svc->srv_threads_running--; + thread->t_flags &= ~SVC_RUNNING; + } + + thread->t_id = rc; + thread->t_flags |= SVC_STOPPED; + + cfs_waitq_signal(&thread->t_ctl_waitq); + cfs_spin_unlock(&svc->srv_lock); + + return rc; +} + +struct ptlrpc_hr_args { + int thread_index; + int cpu_index; + struct ptlrpc_hr_service *hrs; +}; + +static int hrt_dont_sleep(struct ptlrpc_hr_thread *t, + cfs_list_t *replies) +{ + int result; + + cfs_spin_lock(&t->hrt_lock); + cfs_list_splice_init(&t->hrt_queue, replies); + result = cfs_test_bit(HRT_STOPPING, &t->hrt_flags) || + !cfs_list_empty(replies); + cfs_spin_unlock(&t->hrt_lock); + return result; +} + +/** + * Main body of "handle reply" function. + * It processes acked reply states + */ +static int ptlrpc_hr_main(void *arg) +{ + struct ptlrpc_hr_args * hr_args = arg; + struct ptlrpc_hr_service *hr = hr_args->hrs; + struct ptlrpc_hr_thread *t = &hr->hr_threads[hr_args->thread_index]; + char threadname[20]; + CFS_LIST_HEAD(replies); + + snprintf(threadname, sizeof(threadname), + "ptlrpc_hr_%d", hr_args->thread_index); + + cfs_daemonize_ctxt(threadname); +#if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK) + cfs_set_cpus_allowed(cfs_current(), + node_to_cpumask(cpu_to_node(hr_args->cpu_index))); +#endif + cfs_set_bit(HRT_RUNNING, &t->hrt_flags); + cfs_waitq_signal(&t->hrt_wait); - spin_unlock_irqrestore(&svc->srv_lock, flags); + while (!cfs_test_bit(HRT_STOPPING, &t->hrt_flags)) { + + l_wait_condition(t->hrt_wait, hrt_dont_sleep(t, &replies)); + while (!cfs_list_empty(&replies)) { + struct ptlrpc_reply_state *rs; + + rs = cfs_list_entry(replies.prev, + struct ptlrpc_reply_state, + rs_list); + cfs_list_del_init(&rs->rs_list); + ptlrpc_handle_rs(rs); + } + } + + cfs_clear_bit(HRT_RUNNING, &t->hrt_flags); + cfs_complete(&t->hrt_completion); - CDEBUG(D_NET, "service thread exiting, process %d\n", current->pid); return 0; } +static int ptlrpc_start_hr_thread(struct ptlrpc_hr_service *hr, int n, int cpu) +{ + struct ptlrpc_hr_thread *t = &hr->hr_threads[n]; + struct ptlrpc_hr_args args; + int rc; + ENTRY; + + args.thread_index = n; + args.cpu_index = cpu; + args.hrs = hr; + + rc = cfs_kernel_thread(ptlrpc_hr_main, (void*)&args, + CLONE_VM|CLONE_FILES); + if (rc < 0) { + cfs_complete(&t->hrt_completion); + GOTO(out, rc); + } + l_wait_condition(t->hrt_wait, cfs_test_bit(HRT_RUNNING, &t->hrt_flags)); + RETURN(0); + out: + return rc; +} + +static void ptlrpc_stop_hr_thread(struct ptlrpc_hr_thread *t) +{ + ENTRY; + + cfs_set_bit(HRT_STOPPING, &t->hrt_flags); + cfs_waitq_signal(&t->hrt_wait); + cfs_wait_for_completion(&t->hrt_completion); + + EXIT; +} + +static void ptlrpc_stop_hr_threads(struct ptlrpc_hr_service *hrs) +{ + int n; + ENTRY; + + for (n = 0; n < hrs->hr_n_threads; n++) + ptlrpc_stop_hr_thread(&hrs->hr_threads[n]); + + EXIT; +} + +static int ptlrpc_start_hr_threads(struct ptlrpc_hr_service *hr) +{ + int rc = -ENOMEM; + int n, cpu, threads_started = 0; + ENTRY; + + LASSERT(hr != NULL); + LASSERT(hr->hr_n_threads > 0); + + for (n = 0, cpu = 0; n < hr->hr_n_threads; n++) { +#if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK) + while(!cfs_cpu_online(cpu)) { + cpu++; + if (cpu >= cfs_num_possible_cpus()) + cpu = 0; + } +#endif + rc = ptlrpc_start_hr_thread(hr, n, cpu); + if (rc != 0) + break; + threads_started++; + cpu++; + } + if (threads_started == 0) { + CERROR("No reply handling threads started\n"); + RETURN(-ESRCH); + } + if (threads_started < hr->hr_n_threads) { + CWARN("Started only %d reply handling threads from %d\n", + threads_started, hr->hr_n_threads); + hr->hr_n_threads = threads_started; + } + RETURN(0); +} + static void ptlrpc_stop_thread(struct ptlrpc_service *svc, struct ptlrpc_thread *thread) { struct l_wait_info lwi = { 0 }; - unsigned long flags; + ENTRY; + + CDEBUG(D_RPCTRACE, "Stopping thread [ %p : %u ]\n", + thread, thread->t_pid); - spin_lock_irqsave(&svc->srv_lock, flags); - thread->t_flags = SVC_STOPPING; - spin_unlock_irqrestore(&svc->srv_lock, flags); + cfs_spin_lock(&svc->srv_lock); + /* let the thread know that we would like it to stop asap */ + thread->t_flags |= SVC_STOPPING; + cfs_spin_unlock(&svc->srv_lock); - wake_up_all(&svc->srv_waitq); - l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED), - &lwi); + cfs_waitq_broadcast(&svc->srv_waitq); + l_wait_event(thread->t_ctl_waitq, + (thread->t_flags & SVC_STOPPED), &lwi); - spin_lock_irqsave(&svc->srv_lock, flags); - list_del(&thread->t_link); - spin_unlock_irqrestore(&svc->srv_lock, flags); + cfs_spin_lock(&svc->srv_lock); + cfs_list_del(&thread->t_link); + cfs_spin_unlock(&svc->srv_lock); - OBD_FREE(thread, sizeof(*thread)); + OBD_FREE_PTR(thread); + EXIT; } +/** + * Stops all threads of a particular service \a svc + */ void ptlrpc_stop_all_threads(struct ptlrpc_service *svc) { - unsigned long flags; struct ptlrpc_thread *thread; + ENTRY; - spin_lock_irqsave(&svc->srv_lock, flags); - while (!list_empty(&svc->srv_threads)) { - thread = list_entry(svc->srv_threads.next, - struct ptlrpc_thread, t_link); + cfs_spin_lock(&svc->srv_lock); + while (!cfs_list_empty(&svc->srv_threads)) { + thread = cfs_list_entry(svc->srv_threads.next, + struct ptlrpc_thread, t_link); - spin_unlock_irqrestore(&svc->srv_lock, flags); + cfs_spin_unlock(&svc->srv_lock); ptlrpc_stop_thread(svc, thread); - spin_lock_irqsave(&svc->srv_lock, flags); + cfs_spin_lock(&svc->srv_lock); } - spin_unlock_irqrestore(&svc->srv_lock, flags); + cfs_spin_unlock(&svc->srv_lock); + EXIT; } -/* @base_name should be 12 characters or less - 3 will be added on */ -int ptlrpc_start_n_threads(struct obd_device *dev, struct ptlrpc_service *svc, - int num_threads, char *base_name) +int ptlrpc_start_threads(struct ptlrpc_service *svc) { int i, rc = 0; ENTRY; - for (i = 0; i < num_threads; i++) { - char name[32]; - sprintf(name, "%s_%02d", base_name, i); - rc = ptlrpc_start_thread(dev, svc, name); + /* 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(svc); + /* We have enough threads, don't start more. b=15759 */ + if (rc == -EMFILE) { + rc = 0; + break; + } if (rc) { - CERROR("cannot start %s thread #%d: rc %d\n", base_name, - i, rc); + CERROR("cannot start %s thread #%d: rc %d\n", + svc->srv_thread_name, i, rc); ptlrpc_stop_all_threads(svc); + break; } } RETURN(rc); } -int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc, - char *name) +int ptlrpc_start_thread(struct ptlrpc_service *svc) { struct l_wait_info lwi = { 0 }; struct ptlrpc_svc_data d; struct ptlrpc_thread *thread; - unsigned long flags; + char name[32]; int rc; ENTRY; - OBD_ALLOC(thread, sizeof(*thread)); + CDEBUG(D_RPCTRACE, "%s started %d min %d max %d running %d\n", + svc->srv_name, svc->srv_threads_running, svc->srv_threads_min, + svc->srv_threads_max, svc->srv_threads_running); + + if (unlikely(svc->srv_is_stopping)) + RETURN(-ESRCH); + + if (!ptlrpc_threads_increasable(svc) || + (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) && + svc->srv_threads_running == svc->srv_threads_min - 1)) + RETURN(-EMFILE); + + OBD_ALLOC_PTR(thread); if (thread == NULL) RETURN(-ENOMEM); - init_waitqueue_head(&thread->t_ctl_waitq); - - d.dev = dev; + cfs_waitq_init(&thread->t_ctl_waitq); + + cfs_spin_lock(&svc->srv_lock); + if (!ptlrpc_threads_increasable(svc)) { + cfs_spin_unlock(&svc->srv_lock); + OBD_FREE_PTR(thread); + RETURN(-EMFILE); + } + + svc->srv_threads_starting++; + thread->t_id = svc->srv_threads_next_id++; + thread->t_flags |= SVC_STARTING; + thread->t_svc = svc; + + cfs_list_add(&thread->t_link, &svc->srv_threads); + cfs_spin_unlock(&svc->srv_lock); + + sprintf(name, "%s_%02d", svc->srv_thread_name, thread->t_id); d.svc = svc; d.name = name; d.thread = thread; - spin_lock_irqsave(&svc->srv_lock, flags); - list_add(&thread->t_link, &svc->srv_threads); - spin_unlock_irqrestore(&svc->srv_lock, flags); + CDEBUG(D_RPCTRACE, "starting thread '%s'\n", name); /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we - * just drop the VM and FILES in ptlrpc_daemonize() right away. + * just drop the VM and FILES in cfs_daemonize_ctxt() right away. */ - rc = kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES); + rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES); if (rc < 0) { - CERROR("cannot start thread: %d\n", rc); + CERROR("cannot start thread '%s': rc %d\n", name, rc); + + cfs_spin_lock(&svc->srv_lock); + cfs_list_del(&thread->t_link); + --svc->srv_threads_starting; + cfs_spin_unlock(&svc->srv_lock); + OBD_FREE(thread, sizeof(*thread)); RETURN(rc); } - l_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING, &lwi); + 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); +} + + +int ptlrpc_hr_init(void) +{ + int i; + int n_cpus = cfs_num_online_cpus(); + struct ptlrpc_hr_service *hr; + int size; + int rc; + ENTRY; + + LASSERT(ptlrpc_hr == NULL); + + size = offsetof(struct ptlrpc_hr_service, hr_threads[n_cpus]); + OBD_ALLOC(hr, size); + if (hr == NULL) + RETURN(-ENOMEM); + for (i = 0; i < n_cpus; i++) { + struct ptlrpc_hr_thread *t = &hr->hr_threads[i]; + + cfs_spin_lock_init(&t->hrt_lock); + cfs_waitq_init(&t->hrt_wait); + CFS_INIT_LIST_HEAD(&t->hrt_queue); + cfs_init_completion(&t->hrt_completion); + } + hr->hr_n_threads = n_cpus; + hr->hr_size = size; + ptlrpc_hr = hr; + + rc = ptlrpc_start_hr_threads(hr); + if (rc) { + OBD_FREE(hr, hr->hr_size); + ptlrpc_hr = NULL; + } + RETURN(rc); +} + +void ptlrpc_hr_fini(void) +{ + if (ptlrpc_hr != NULL) { + ptlrpc_stop_hr_threads(ptlrpc_hr); + OBD_FREE(ptlrpc_hr, ptlrpc_hr->hr_size); + ptlrpc_hr = NULL; + } +} + +#endif /* __KERNEL__ */ + +/** + * Wait until all already scheduled replies are processed. + */ +static void ptlrpc_wait_replies(struct ptlrpc_service *svc) +{ + while (1) { + int rc; + struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10), + NULL, NULL); + rc = l_wait_event(svc->srv_waitq, cfs_atomic_read(&svc-> \ + srv_n_difficult_replies) == 0, + &lwi); + if (rc == 0) + break; + CWARN("Unexpectedly long timeout %p\n", svc); + } } -#endif int ptlrpc_unregister_service(struct ptlrpc_service *service) { - int i; int rc; - unsigned long flags; - struct ptlrpc_srv_ni *srv_ni; struct l_wait_info lwi; - struct list_head *tmp; + cfs_list_t *tmp; + struct ptlrpc_reply_state *rs, *t; + struct ptlrpc_at_array *array = &service->srv_at_array; + ENTRY; + + service->srv_is_stopping = 1; + cfs_timer_disarm(&service->srv_at_timer); - LASSERT(list_empty(&service->srv_threads)); + ptlrpc_stop_all_threads(service); + LASSERT(cfs_list_empty(&service->srv_threads)); - spin_lock (&ptlrpc_all_services_lock); - list_del_init (&service->srv_list); - spin_unlock (&ptlrpc_all_services_lock); + cfs_spin_lock (&ptlrpc_all_services_lock); + cfs_list_del_init (&service->srv_list); + cfs_spin_unlock (&ptlrpc_all_services_lock); ptlrpc_lprocfs_unregister_service(service); - for (i = 0; i < ptlrpc_ninterfaces; i++) { - srv_ni = &service->srv_interfaces[i]; - CDEBUG(D_NET, "%s: tearing down interface %s\n", - service->srv_name, srv_ni->sni_ni->pni_name); + /* All history will be culled when the next request buffer is + * freed */ + service->srv_max_history_rqbds = 0; - /* Unlink all the request buffers. This forces a 'final' - * event with its 'unlink' flag set for each posted rqbd */ - list_for_each(tmp, &srv_ni->sni_active_rqbds) { - struct ptlrpc_request_buffer_desc *rqbd = - list_entry(tmp, struct ptlrpc_request_buffer_desc, - rqbd_list); + CDEBUG(D_NET, "%s: tearing down\n", service->srv_name); - rc = PtlMDUnlink(rqbd->rqbd_md_h); - LASSERT (rc == PTL_OK || rc == PTL_MD_INVALID); - } + rc = LNetClearLazyPortal(service->srv_req_portal); + LASSERT (rc == 0); - /* Wait for the network to release any buffers it's - * currently filling */ - for (;;) { - spin_lock_irqsave(&service->srv_lock, flags); - rc = srv_ni->sni_nrqbd_receiving; - spin_unlock_irqrestore(&service->srv_lock, flags); + /* Unlink all the request buffers. This forces a 'final' event with + * its 'unlink' flag set for each posted rqbd */ + cfs_list_for_each(tmp, &service->srv_active_rqbds) { + struct ptlrpc_request_buffer_desc *rqbd = + cfs_list_entry(tmp, struct ptlrpc_request_buffer_desc, + rqbd_list); - if (rc == 0) - break; - - /* Network access will complete in finite time but - * the HUGE timeout lets us CWARN for visibility of - * sluggish NALs */ - lwi = LWI_TIMEOUT(300 * HZ, NULL, NULL); - rc = l_wait_event(service->srv_waitq, - srv_ni->sni_nrqbd_receiving == 0, - &lwi); - if (rc == -ETIMEDOUT) - CWARN("Waiting for request buffers on " - "service %s on interface %s ", - service->srv_name, srv_ni->sni_ni->pni_name); - } + rc = LNetMDUnlink(rqbd->rqbd_md_h); + LASSERT (rc == 0 || rc == -ENOENT); + } - /* schedule all outstanding replies to terminate them */ - spin_lock_irqsave(&service->srv_lock, flags); - while (!list_empty(&srv_ni->sni_active_replies)) { - struct ptlrpc_reply_state *rs = - list_entry(srv_ni->sni_active_replies.next, - struct ptlrpc_reply_state, - rs_list); - ptlrpc_schedule_difficult_reply(rs); - } - spin_unlock_irqrestore(&service->srv_lock, flags); + /* Wait for the network to release any buffers it's currently + * filling */ + for (;;) { + cfs_spin_lock(&service->srv_lock); + rc = service->srv_nrqbd_receiving; + cfs_spin_unlock(&service->srv_lock); + + if (rc == 0) + break; + + /* Network access will complete in finite time but the HUGE + * timeout lets us CWARN for visibility of sluggish NALs */ + lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK), + cfs_time_seconds(1), 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); + } + + /* schedule all outstanding replies to terminate them */ + cfs_spin_lock(&service->srv_rs_lock); + while (!cfs_list_empty(&service->srv_active_replies)) { + struct ptlrpc_reply_state *rs = + cfs_list_entry(service->srv_active_replies.next, + struct ptlrpc_reply_state, rs_list); + cfs_spin_lock(&rs->rs_lock); + ptlrpc_schedule_difficult_reply(rs); + cfs_spin_unlock(&rs->rs_lock); } + cfs_spin_unlock(&service->srv_rs_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_request_queue)) { + while (!cfs_list_empty(&service->srv_req_in_queue)) { struct ptlrpc_request *req = - list_entry(service->srv_request_queue.next, - struct ptlrpc_request, - rq_list); - - list_del(&req->rq_list); + cfs_list_entry(service->srv_req_in_queue.next, + struct ptlrpc_request, + rq_list); + + cfs_list_del(&req->rq_list); service->srv_n_queued_reqs--; service->srv_n_active_reqs++; + ptlrpc_server_finish_request(service, req); + } + while (ptlrpc_server_request_pending(service, 1)) { + struct ptlrpc_request *req; - ptlrpc_server_free_request(service, req); + req = ptlrpc_server_request_get(service, 1); + cfs_list_del(&req->rq_list); + service->srv_n_queued_reqs--; + service->srv_n_active_reqs++; + ptlrpc_hpreq_fini(req); + ptlrpc_server_finish_request(service, req); } LASSERT(service->srv_n_queued_reqs == 0); LASSERT(service->srv_n_active_reqs == 0); - - for (i = 0; i < ptlrpc_ninterfaces; i++) { - srv_ni = &service->srv_interfaces[i]; - LASSERT(list_empty(&srv_ni->sni_active_rqbds)); - } + LASSERT(service->srv_n_history_rqbds == 0); + LASSERT(cfs_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)) { + while (!cfs_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); + cfs_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(10 * HZ, NULL, NULL); + ptlrpc_wait_replies(service); - rc = l_wait_event(service->srv_waitq, - !list_empty(&service->srv_reply_queue), &lwi); - LASSERT(rc == 0 || rc == -ETIMEDOUT); + cfs_list_for_each_entry_safe(rs, t, &service->srv_free_rs_list, + rs_list) { + cfs_list_del(&rs->rs_list); + OBD_FREE(rs, service->srv_max_reply_size); + } - if (rc == 0) { - ptlrpc_server_handle_reply(service); - continue; - } - CWARN("Unexpectedly long timeout %p\n", service); + /* In case somebody rearmed this in the meantime */ + cfs_timer_disarm(&service->srv_at_timer); + + if (array->paa_reqs_array != NULL) { + OBD_FREE(array->paa_reqs_array, + sizeof(cfs_list_t) * array->paa_size); + array->paa_reqs_array = NULL; + } + + if (array->paa_reqs_count != NULL) { + OBD_FREE(array->paa_reqs_count, + sizeof(__u32) * array->paa_size); + array->paa_reqs_count= NULL; + } + + 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; + + cfs_gettimeofday(&right_now); + + cfs_spin_lock(&svc->srv_rq_lock); + if (!ptlrpc_server_request_pending(svc, 1)) { + cfs_spin_unlock(&svc->srv_rq_lock); + return 0; + } + + /* How long has the next entry been waiting? */ + if (cfs_list_empty(&svc->srv_request_queue)) + request = cfs_list_entry(svc->srv_request_hpq.next, + struct ptlrpc_request, rq_list); + else + request = cfs_list_entry(svc->srv_request_queue.next, + struct ptlrpc_request, rq_list); + timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL); + cfs_spin_unlock(&svc->srv_rq_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); } - OBD_FREE(service, - offsetof(struct ptlrpc_service, - srv_interfaces[ptlrpc_ninterfaces])); return 0; }