1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_RPC
39 #include <liblustre.h>
41 #include <obd_support.h>
42 #include <obd_class.h>
43 #include <lustre_net.h>
44 #include <lu_object.h>
45 #include <lnet/types.h>
46 #include "ptlrpc_internal.h"
48 /* The following are visible and mutable through /sys/module/ptlrpc */
49 int test_req_buffer_pressure = 0;
50 CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
51 "set non-zero to put pressure on request buffer pools");
52 CFS_MODULE_PARM(at_min, "i", int, 0644,
53 "Adaptive timeout minimum (sec)");
54 CFS_MODULE_PARM(at_max, "i", int, 0644,
55 "Adaptive timeout maximum (sec)");
56 CFS_MODULE_PARM(at_history, "i", int, 0644,
57 "Adaptive timeouts remember the slowest event that took place "
58 "within this period (sec)");
59 CFS_MODULE_PARM(at_early_margin, "i", int, 0644,
60 "How soon before an RPC deadline to send an early reply");
61 CFS_MODULE_PARM(at_extra, "i", int, 0644,
62 "How much extra time to give with each early reply");
66 static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc);
68 static CFS_LIST_HEAD(ptlrpc_all_services);
69 cfs_spinlock_t ptlrpc_all_services_lock;
72 ptlrpc_alloc_request_buffer (int size)
76 if (size > SVC_BUF_VMALLOC_THRESHOLD)
77 OBD_VMALLOC(ptr, size);
85 ptlrpc_free_request_buffer (char *ptr, int size)
87 if (size > SVC_BUF_VMALLOC_THRESHOLD)
93 struct ptlrpc_request_buffer_desc *
94 ptlrpc_alloc_rqbd (struct ptlrpc_service *svc)
96 struct ptlrpc_request_buffer_desc *rqbd;
102 rqbd->rqbd_service = svc;
103 rqbd->rqbd_refcount = 0;
104 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
105 rqbd->rqbd_cbid.cbid_arg = rqbd;
106 CFS_INIT_LIST_HEAD(&rqbd->rqbd_reqs);
107 rqbd->rqbd_buffer = ptlrpc_alloc_request_buffer(svc->srv_buf_size);
109 if (rqbd->rqbd_buffer == NULL) {
114 cfs_spin_lock(&svc->srv_lock);
115 cfs_list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
117 cfs_spin_unlock(&svc->srv_lock);
123 ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
125 struct ptlrpc_service *svc = rqbd->rqbd_service;
127 LASSERT (rqbd->rqbd_refcount == 0);
128 LASSERT (cfs_list_empty(&rqbd->rqbd_reqs));
130 cfs_spin_lock(&svc->srv_lock);
131 cfs_list_del(&rqbd->rqbd_list);
133 cfs_spin_unlock(&svc->srv_lock);
135 ptlrpc_free_request_buffer (rqbd->rqbd_buffer, svc->srv_buf_size);
140 ptlrpc_grow_req_bufs(struct ptlrpc_service *svc)
142 struct ptlrpc_request_buffer_desc *rqbd;
145 CDEBUG(D_RPCTRACE, "%s: allocate %d new %d-byte reqbufs (%d/%d left)\n",
146 svc->srv_name, svc->srv_nbuf_per_group, svc->srv_buf_size,
147 svc->srv_nrqbd_receiving, svc->srv_nbufs);
148 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
149 rqbd = ptlrpc_alloc_rqbd(svc);
152 CERROR ("%s: Can't allocate request buffer\n",
157 if (ptlrpc_server_post_idle_rqbds(svc) < 0)
165 * Part of Rep-Ack logic.
166 * Puts a lock and its mode into reply state assotiated to request reply.
169 ptlrpc_save_lock(struct ptlrpc_request *req,
170 struct lustre_handle *lock, int mode, int no_ack)
172 struct ptlrpc_reply_state *rs = req->rq_reply_state;
176 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
178 if (req->rq_export->exp_disconnected) {
179 ldlm_lock_decref(lock, mode);
181 idx = rs->rs_nlocks++;
182 rs->rs_locks[idx] = *lock;
183 rs->rs_modes[idx] = mode;
184 rs->rs_difficult = 1;
185 rs->rs_no_ack = !!no_ack;
191 #define HRT_RUNNING 0
192 #define HRT_STOPPING 1
194 struct ptlrpc_hr_thread {
195 cfs_spinlock_t hrt_lock;
196 unsigned long hrt_flags;
197 cfs_waitq_t hrt_wait;
198 cfs_list_t hrt_queue;
199 cfs_completion_t hrt_completion;
202 struct ptlrpc_hr_service {
206 struct ptlrpc_hr_thread hr_threads[0];
210 cfs_list_t rsb_replies;
211 struct ptlrpc_service *rsb_svc;
212 unsigned int rsb_n_replies;
216 * A pointer to per-node reply handling service.
218 static struct ptlrpc_hr_service *ptlrpc_hr = NULL;
221 * maximum mumber of replies scheduled in one batch
223 #define MAX_SCHEDULED 256
226 * Initialize a reply batch.
230 static void rs_batch_init(struct rs_batch *b)
232 memset(b, 0, sizeof *b);
233 CFS_INIT_LIST_HEAD(&b->rsb_replies);
237 * Choose an hr thread to dispatch requests to.
239 static unsigned int get_hr_thread_index(struct ptlrpc_hr_service *hr)
243 /* Concurrent modification of hr_index w/o any spinlock
244 protection is harmless as long as the result fits
245 [0..(hr_n_threads-1)] range and each thread gets near equal
248 hr->hr_index = (idx >= hr->hr_n_threads - 1) ? 0 : idx + 1;
253 * Dispatch all replies accumulated in the batch to one from
254 * dedicated reply handling threads.
258 static void rs_batch_dispatch(struct rs_batch *b)
260 if (b->rsb_n_replies != 0) {
261 struct ptlrpc_hr_service *hr = ptlrpc_hr;
264 idx = get_hr_thread_index(hr);
266 cfs_spin_lock(&hr->hr_threads[idx].hrt_lock);
267 cfs_list_splice_init(&b->rsb_replies,
268 &hr->hr_threads[idx].hrt_queue);
269 cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock);
270 cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
271 b->rsb_n_replies = 0;
276 * Add a reply to a batch.
277 * Add one reply object to a batch, schedule batched replies if overload.
282 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
284 struct ptlrpc_service *svc = rs->rs_service;
286 if (svc != b->rsb_svc || b->rsb_n_replies >= MAX_SCHEDULED) {
287 if (b->rsb_svc != NULL) {
288 rs_batch_dispatch(b);
289 cfs_spin_unlock(&b->rsb_svc->srv_rs_lock);
291 cfs_spin_lock(&svc->srv_rs_lock);
294 cfs_spin_lock(&rs->rs_lock);
295 rs->rs_scheduled_ever = 1;
296 if (rs->rs_scheduled == 0) {
297 cfs_list_move(&rs->rs_list, &b->rsb_replies);
298 rs->rs_scheduled = 1;
301 rs->rs_committed = 1;
302 cfs_spin_unlock(&rs->rs_lock);
306 * Reply batch finalization.
307 * Dispatch remaining replies from the batch
308 * and release remaining spinlock.
312 static void rs_batch_fini(struct rs_batch *b)
314 if (b->rsb_svc != 0) {
315 rs_batch_dispatch(b);
316 cfs_spin_unlock(&b->rsb_svc->srv_rs_lock);
320 #define DECLARE_RS_BATCH(b) struct rs_batch b
322 #else /* __KERNEL__ */
324 #define rs_batch_init(b) do{}while(0)
325 #define rs_batch_fini(b) do{}while(0)
326 #define rs_batch_add(b, r) ptlrpc_schedule_difficult_reply(r)
327 #define DECLARE_RS_BATCH(b)
329 #endif /* __KERNEL__ */
332 * Put reply state into a queue for processing because we received
333 * ACK from the client
335 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
338 struct ptlrpc_hr_service *hr = ptlrpc_hr;
342 LASSERT(cfs_list_empty(&rs->rs_list));
344 idx = get_hr_thread_index(hr);
345 cfs_spin_lock(&hr->hr_threads[idx].hrt_lock);
346 cfs_list_add_tail(&rs->rs_list, &hr->hr_threads[idx].hrt_queue);
347 cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock);
348 cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
351 cfs_list_add_tail(&rs->rs_list, &rs->rs_service->srv_reply_queue);
356 ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
360 LASSERT_SPIN_LOCKED(&rs->rs_service->srv_rs_lock);
361 LASSERT_SPIN_LOCKED(&rs->rs_lock);
362 LASSERT (rs->rs_difficult);
363 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
365 if (rs->rs_scheduled) { /* being set up or already notified */
370 rs->rs_scheduled = 1;
371 cfs_list_del_init(&rs->rs_list);
372 ptlrpc_dispatch_difficult_reply(rs);
376 void ptlrpc_commit_replies(struct obd_export *exp)
378 struct ptlrpc_reply_state *rs, *nxt;
379 DECLARE_RS_BATCH(batch);
382 rs_batch_init(&batch);
383 /* Find any replies that have been committed and get their service
384 * to attend to complete them. */
386 /* CAVEAT EMPTOR: spinlock ordering!!! */
387 cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
388 cfs_list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
390 LASSERT (rs->rs_difficult);
391 /* VBR: per-export last_committed */
392 LASSERT(rs->rs_export);
393 if (rs->rs_transno <= exp->exp_last_committed) {
394 cfs_list_del_init(&rs->rs_obd_list);
395 rs_batch_add(&batch, rs);
398 cfs_spin_unlock(&exp->exp_uncommitted_replies_lock);
399 rs_batch_fini(&batch);
404 ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc)
406 struct ptlrpc_request_buffer_desc *rqbd;
411 cfs_spin_lock(&svc->srv_lock);
413 if (cfs_list_empty (&svc->srv_idle_rqbds)) {
414 cfs_spin_unlock(&svc->srv_lock);
418 rqbd = cfs_list_entry(svc->srv_idle_rqbds.next,
419 struct ptlrpc_request_buffer_desc,
421 cfs_list_del (&rqbd->rqbd_list);
423 /* assume we will post successfully */
424 svc->srv_nrqbd_receiving++;
425 cfs_list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds);
427 cfs_spin_unlock(&svc->srv_lock);
429 rc = ptlrpc_register_rqbd(rqbd);
436 cfs_spin_lock(&svc->srv_lock);
438 svc->srv_nrqbd_receiving--;
439 cfs_list_del(&rqbd->rqbd_list);
440 cfs_list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
442 /* Don't complain if no request buffers are posted right now; LNET
443 * won't drop requests because we set the portal lazy! */
445 cfs_spin_unlock(&svc->srv_lock);
451 * Start a service with parameters from struct ptlrpc_service_conf \a c
452 * as opposed to directly calling ptlrpc_init_svc with tons of arguments.
454 struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c,
455 svc_handler_t h, char *name,
456 struct proc_dir_entry *proc_entry,
457 svc_req_printfn_t prntfn,
460 return ptlrpc_init_svc(c->psc_nbufs, c->psc_bufsize,
461 c->psc_max_req_size, c->psc_max_reply_size,
462 c->psc_req_portal, c->psc_rep_portal,
463 c->psc_watchdog_factor,
465 prntfn, c->psc_min_threads, c->psc_max_threads,
466 threadname, c->psc_ctx_tags, NULL);
468 EXPORT_SYMBOL(ptlrpc_init_svc_conf);
470 static void ptlrpc_at_timer(unsigned long castmeharder)
472 struct ptlrpc_service *svc = (struct ptlrpc_service *)castmeharder;
473 svc->srv_at_check = 1;
474 svc->srv_at_checktime = cfs_time_current();
475 cfs_waitq_signal(&svc->srv_waitq);
479 * Initialize service on a given portal.
480 * This includes starting serving threads , allocating and posting rqbds and
482 * \a nbufs is how many buffers to post
483 * \a bufsize is buffer size to post
484 * \a max_req_size - maximum request size to be accepted for this service
485 * \a max_reply_size maximum reply size this service can ever send
486 * \a req_portal - portal to listed for requests on
487 * \a rep_portal - portal of where to send replies to
488 * \a watchdog_factor soft watchdog timeout multiplifier to print stuck service traces.
489 * \a handler - function to process every new request
490 * \a name - service name
491 * \a proc_entry - entry in the /proc tree for sttistics reporting
492 * \a min_threads \a max_threads - min/max number of service threads to start.
493 * \a threadname should be 11 characters or less - 3 will be added on
494 * \a hp_handler - function to determine priority of the request, also called
495 * on every new request.
497 struct ptlrpc_service *
498 ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, int max_reply_size,
499 int req_portal, int rep_portal, int watchdog_factor,
500 svc_handler_t handler, char *name,
501 cfs_proc_dir_entry_t *proc_entry,
502 svc_req_printfn_t svcreq_printfn,
503 int min_threads, int max_threads,
504 char *threadname, __u32 ctx_tags,
505 svc_hpreq_handler_t hp_handler)
508 struct ptlrpc_at_array *array;
509 struct ptlrpc_service *service;
510 unsigned int size, index;
514 LASSERT (bufsize >= max_req_size + SPTLRPC_MAX_PAYLOAD);
515 LASSERT (ctx_tags != 0);
517 OBD_ALLOC_PTR(service);
521 /* First initialise enough for early teardown */
523 service->srv_name = name;
524 cfs_spin_lock_init(&service->srv_lock);
525 cfs_spin_lock_init(&service->srv_rq_lock);
526 cfs_spin_lock_init(&service->srv_rs_lock);
527 CFS_INIT_LIST_HEAD(&service->srv_threads);
528 cfs_waitq_init(&service->srv_waitq);
530 service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 : nbufs;
531 service->srv_max_req_size = max_req_size + SPTLRPC_MAX_PAYLOAD;
532 service->srv_buf_size = bufsize;
533 service->srv_rep_portal = rep_portal;
534 service->srv_req_portal = req_portal;
535 service->srv_watchdog_factor = watchdog_factor;
536 service->srv_handler = handler;
537 service->srv_req_printfn = svcreq_printfn;
538 service->srv_request_seq = 1; /* valid seq #s start at 1 */
539 service->srv_request_max_cull_seq = 0;
540 service->srv_threads_min = min_threads;
541 service->srv_threads_max = max_threads;
542 service->srv_thread_name = threadname;
543 service->srv_ctx_tags = ctx_tags;
544 service->srv_hpreq_handler = hp_handler;
545 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
546 service->srv_hpreq_count = 0;
547 service->srv_n_active_hpreq = 0;
549 rc = LNetSetLazyPortal(service->srv_req_portal);
552 CFS_INIT_LIST_HEAD(&service->srv_request_queue);
553 CFS_INIT_LIST_HEAD(&service->srv_request_hpq);
554 CFS_INIT_LIST_HEAD(&service->srv_idle_rqbds);
555 CFS_INIT_LIST_HEAD(&service->srv_active_rqbds);
556 CFS_INIT_LIST_HEAD(&service->srv_history_rqbds);
557 CFS_INIT_LIST_HEAD(&service->srv_request_history);
558 CFS_INIT_LIST_HEAD(&service->srv_active_replies);
560 CFS_INIT_LIST_HEAD(&service->srv_reply_queue);
562 CFS_INIT_LIST_HEAD(&service->srv_free_rs_list);
563 cfs_waitq_init(&service->srv_free_rs_waitq);
564 cfs_atomic_set(&service->srv_n_difficult_replies, 0);
566 cfs_spin_lock_init(&service->srv_at_lock);
567 CFS_INIT_LIST_HEAD(&service->srv_req_in_queue);
569 array = &service->srv_at_array;
570 size = at_est2timeout(at_max);
571 array->paa_size = size;
572 array->paa_count = 0;
573 array->paa_deadline = -1;
575 /* allocate memory for srv_at_array (ptlrpc_at_array) */
576 OBD_ALLOC(array->paa_reqs_array, sizeof(cfs_list_t) * size);
577 if (array->paa_reqs_array == NULL)
580 for (index = 0; index < size; index++)
581 CFS_INIT_LIST_HEAD(&array->paa_reqs_array[index]);
583 OBD_ALLOC(array->paa_reqs_count, sizeof(__u32) * size);
584 if (array->paa_reqs_count == NULL)
587 cfs_timer_init(&service->srv_at_timer, ptlrpc_at_timer, service);
588 /* At SOW, service time should be quick; 10s seems generous. If client
589 timeout is less than this, we'll be sending an early reply. */
590 at_init(&service->srv_at_estimate, 10, 0);
592 cfs_spin_lock (&ptlrpc_all_services_lock);
593 cfs_list_add (&service->srv_list, &ptlrpc_all_services);
594 cfs_spin_unlock (&ptlrpc_all_services_lock);
596 /* Now allocate the request buffers */
597 rc = ptlrpc_grow_req_bufs(service);
598 /* We shouldn't be under memory pressure at startup, so
599 * fail if we can't post all our buffers at this time. */
603 /* Now allocate pool of reply buffers */
604 /* Increase max reply size to next power of two */
605 service->srv_max_reply_size = 1;
606 while (service->srv_max_reply_size <
607 max_reply_size + SPTLRPC_MAX_PAYLOAD)
608 service->srv_max_reply_size <<= 1;
610 if (proc_entry != NULL)
611 ptlrpc_lprocfs_register_service(proc_entry, service);
613 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
614 service->srv_name, service->srv_req_portal);
618 ptlrpc_unregister_service(service);
623 * to actually free the request, must be called without holding svc_lock.
624 * note it's caller's responsibility to unlink req->rq_list.
626 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
628 LASSERT(cfs_atomic_read(&req->rq_refcount) == 0);
629 LASSERT(cfs_list_empty(&req->rq_timed_list));
631 /* DEBUG_REQ() assumes the reply state of a request with a valid
632 * ref will not be destroyed until that reference is dropped. */
633 ptlrpc_req_drop_rs(req);
635 sptlrpc_svc_ctx_decref(req);
637 if (req != &req->rq_rqbd->rqbd_req) {
638 /* NB request buffers use an embedded
639 * req if the incoming req unlinked the
640 * MD; this isn't one of them! */
641 OBD_FREE(req, sizeof(*req));
646 * drop a reference count of the request. if it reaches 0, we either
647 * put it into history list, or free it immediately.
649 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
651 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
652 struct ptlrpc_service *svc = rqbd->rqbd_service;
657 if (!cfs_atomic_dec_and_test(&req->rq_refcount))
660 cfs_spin_lock(&svc->srv_at_lock);
661 if (req->rq_at_linked) {
662 struct ptlrpc_at_array *array = &svc->srv_at_array;
663 __u32 index = req->rq_at_index;
665 LASSERT(!cfs_list_empty(&req->rq_timed_list));
666 cfs_list_del_init(&req->rq_timed_list);
667 cfs_spin_lock(&req->rq_lock);
668 req->rq_at_linked = 0;
669 cfs_spin_unlock(&req->rq_lock);
670 array->paa_reqs_count[index]--;
673 LASSERT(cfs_list_empty(&req->rq_timed_list));
674 cfs_spin_unlock(&svc->srv_at_lock);
676 /* finalize request */
677 if (req->rq_export) {
678 class_export_put(req->rq_export);
679 req->rq_export = NULL;
682 cfs_spin_lock(&svc->srv_lock);
684 cfs_list_add(&req->rq_list, &rqbd->rqbd_reqs);
686 refcount = --(rqbd->rqbd_refcount);
688 /* request buffer is now idle: add to history */
689 cfs_list_del(&rqbd->rqbd_list);
690 cfs_list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
691 svc->srv_n_history_rqbds++;
693 /* cull some history?
694 * I expect only about 1 or 2 rqbds need to be recycled here */
695 while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
696 rqbd = cfs_list_entry(svc->srv_history_rqbds.next,
697 struct ptlrpc_request_buffer_desc,
700 cfs_list_del(&rqbd->rqbd_list);
701 svc->srv_n_history_rqbds--;
703 /* remove rqbd's reqs from svc's req history while
704 * I've got the service lock */
705 cfs_list_for_each(tmp, &rqbd->rqbd_reqs) {
706 req = cfs_list_entry(tmp, struct ptlrpc_request,
708 /* Track the highest culled req seq */
709 if (req->rq_history_seq >
710 svc->srv_request_max_cull_seq)
711 svc->srv_request_max_cull_seq =
713 cfs_list_del(&req->rq_history_list);
716 cfs_spin_unlock(&svc->srv_lock);
718 cfs_list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
719 req = cfs_list_entry(rqbd->rqbd_reqs.next,
720 struct ptlrpc_request,
722 cfs_list_del(&req->rq_list);
723 ptlrpc_server_free_request(req);
726 cfs_spin_lock(&svc->srv_lock);
728 * now all reqs including the embedded req has been
729 * disposed, schedule request buffer for re-use.
731 LASSERT(cfs_atomic_read(&rqbd->rqbd_req.rq_refcount) ==
733 cfs_list_add_tail(&rqbd->rqbd_list,
734 &svc->srv_idle_rqbds);
737 cfs_spin_unlock(&svc->srv_lock);
738 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
739 /* If we are low on memory, we are not interested in history */
740 cfs_list_del(&req->rq_list);
741 cfs_list_del_init(&req->rq_history_list);
742 cfs_spin_unlock(&svc->srv_lock);
744 ptlrpc_server_free_request(req);
746 cfs_spin_unlock(&svc->srv_lock);
751 * to finish a request: stop sending more early replies, and release
752 * the request. should be called after we finished handling the request.
754 static void ptlrpc_server_finish_request(struct ptlrpc_service *svc,
755 struct ptlrpc_request *req)
757 cfs_spin_lock(&svc->srv_rq_lock);
758 svc->srv_n_active_reqs--;
760 svc->srv_n_active_hpreq--;
761 cfs_spin_unlock(&svc->srv_rq_lock);
763 ptlrpc_server_drop_request(req);
767 * This function makes sure dead exports are evicted in a timely manner.
768 * This function is only called when some export receives a message (i.e.,
769 * the network is up.)
771 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
773 struct obd_export *oldest_exp;
774 time_t oldest_time, new_time;
780 /* Compensate for slow machines, etc, by faking our request time
781 into the future. Although this can break the strict time-ordering
782 of the list, we can be really lazy here - we don't have to evict
783 at the exact right moment. Eventually, all silent exports
784 will make it to the top of the list. */
786 /* Do not pay attention on 1sec or smaller renewals. */
787 new_time = cfs_time_current_sec() + extra_delay;
788 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
791 exp->exp_last_request_time = new_time;
792 CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n",
793 exp->exp_client_uuid.uuid,
794 exp->exp_last_request_time, exp);
796 /* exports may get disconnected from the chain even though the
797 export has references, so we must keep the spin lock while
798 manipulating the lists */
799 cfs_spin_lock(&exp->exp_obd->obd_dev_lock);
801 if (cfs_list_empty(&exp->exp_obd_chain_timed)) {
802 /* this one is not timed */
803 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
807 cfs_list_move_tail(&exp->exp_obd_chain_timed,
808 &exp->exp_obd->obd_exports_timed);
810 oldest_exp = cfs_list_entry(exp->exp_obd->obd_exports_timed.next,
811 struct obd_export, exp_obd_chain_timed);
812 oldest_time = oldest_exp->exp_last_request_time;
813 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
815 if (exp->exp_obd->obd_recovering) {
816 /* be nice to everyone during recovery */
821 /* Note - racing to start/reset the obd_eviction timer is safe */
822 if (exp->exp_obd->obd_eviction_timer == 0) {
823 /* Check if the oldest entry is expired. */
824 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
826 /* We need a second timer, in case the net was down and
827 * it just came back. Since the pinger may skip every
828 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
829 * we better wait for 3. */
830 exp->exp_obd->obd_eviction_timer =
831 cfs_time_current_sec() + 3 * PING_INTERVAL;
832 CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
833 exp->exp_obd->obd_name,
834 obd_export_nid2str(oldest_exp), oldest_time);
837 if (cfs_time_current_sec() >
838 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
839 /* The evictor won't evict anyone who we've heard from
840 * recently, so we don't have to check before we start
842 if (!ping_evictor_wake(exp))
843 exp->exp_obd->obd_eviction_timer = 0;
851 * Sanity check request \a req.
852 * Return 0 if all is ok, error code otherwise.
854 static int ptlrpc_check_req(struct ptlrpc_request *req)
856 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
857 req->rq_export->exp_conn_cnt)) {
858 DEBUG_REQ(D_ERROR, req,
859 "DROPPING req from old connection %d < %d",
860 lustre_msg_get_conn_cnt(req->rq_reqmsg),
861 req->rq_export->exp_conn_cnt);
864 if (unlikely(req->rq_export->exp_obd &&
865 req->rq_export->exp_obd->obd_fail)) {
866 /* Failing over, don't handle any more reqs, send
867 error response instead. */
868 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
869 req, req->rq_export->exp_obd->obd_name);
870 req->rq_status = -ENODEV;
878 static void ptlrpc_at_set_timer(struct ptlrpc_service *svc)
880 struct ptlrpc_at_array *array = &svc->srv_at_array;
883 cfs_spin_lock(&svc->srv_at_lock);
884 if (array->paa_count == 0) {
885 cfs_timer_disarm(&svc->srv_at_timer);
886 cfs_spin_unlock(&svc->srv_at_lock);
890 /* Set timer for closest deadline */
891 next = (__s32)(array->paa_deadline - cfs_time_current_sec() -
894 ptlrpc_at_timer((unsigned long)svc);
896 cfs_timer_arm(&svc->srv_at_timer, cfs_time_shift(next));
897 cfs_spin_unlock(&svc->srv_at_lock);
898 CDEBUG(D_INFO, "armed %s at %+ds\n", svc->srv_name, next);
901 /* Add rpc to early reply check list */
902 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
904 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
905 struct ptlrpc_request *rq = NULL;
906 struct ptlrpc_at_array *array = &svc->srv_at_array;
913 if (req->rq_no_reply)
916 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
919 cfs_spin_lock(&svc->srv_at_lock);
920 LASSERT(cfs_list_empty(&req->rq_timed_list));
922 index = (unsigned long)req->rq_deadline % array->paa_size;
923 if (array->paa_reqs_count[index] > 0) {
924 /* latest rpcs will have the latest deadlines in the list,
925 * so search backward. */
926 cfs_list_for_each_entry_reverse(rq,
927 &array->paa_reqs_array[index],
929 if (req->rq_deadline >= rq->rq_deadline) {
930 cfs_list_add(&req->rq_timed_list,
937 /* Add the request at the head of the list */
938 if (cfs_list_empty(&req->rq_timed_list))
939 cfs_list_add(&req->rq_timed_list,
940 &array->paa_reqs_array[index]);
942 cfs_spin_lock(&req->rq_lock);
943 req->rq_at_linked = 1;
944 cfs_spin_unlock(&req->rq_lock);
945 req->rq_at_index = index;
946 array->paa_reqs_count[index]++;
948 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
949 array->paa_deadline = req->rq_deadline;
952 cfs_spin_unlock(&svc->srv_at_lock);
955 ptlrpc_at_set_timer(svc);
960 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
962 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
963 struct ptlrpc_request *reqcopy;
964 struct lustre_msg *reqmsg;
965 cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
970 /* deadline is when the client expects us to reply, margin is the
971 difference between clients' and servers' expectations */
972 DEBUG_REQ(D_ADAPTTO, req,
973 "%ssending early reply (deadline %+lds, margin %+lds) for "
974 "%d+%d", AT_OFF ? "AT off - not " : "",
975 olddl, olddl - at_get(&svc->srv_at_estimate),
976 at_get(&svc->srv_at_estimate), at_extra);
982 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
983 "not sending early reply. Consider increasing "
984 "at_early_margin (%d)?", olddl, at_early_margin);
986 /* Return an error so we're not re-added to the timed list. */
990 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
991 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
992 "but no AT support");
996 if (req->rq_export &&
997 lustre_msg_get_flags(req->rq_reqmsg) &
998 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
999 /* During recovery, we don't want to send too many early
1000 * replies, but on the other hand we want to make sure the
1001 * client has enough time to resend if the rpc is lost. So
1002 * during the recovery period send at least 4 early replies,
1003 * spacing them every at_extra if we can. at_estimate should
1004 * always equal this fixed value during recovery. */
1005 at_measured(&svc->srv_at_estimate, min(at_extra,
1006 req->rq_export->exp_obd->obd_recovery_timeout / 4));
1008 /* Fake our processing time into the future to ask the clients
1009 * for some extra amount of time */
1010 at_measured(&svc->srv_at_estimate, at_extra +
1011 cfs_time_current_sec() -
1012 req->rq_arrival_time.tv_sec);
1014 /* Check to see if we've actually increased the deadline -
1015 * we may be past adaptive_max */
1016 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1017 at_get(&svc->srv_at_estimate)) {
1018 DEBUG_REQ(D_WARNING, req, "Couldn't add any time "
1019 "(%ld/%ld), not sending early reply\n",
1020 olddl, req->rq_arrival_time.tv_sec +
1021 at_get(&svc->srv_at_estimate) -
1022 cfs_time_current_sec());
1026 newdl = cfs_time_current_sec() + at_get(&svc->srv_at_estimate);
1028 OBD_ALLOC(reqcopy, sizeof *reqcopy);
1029 if (reqcopy == NULL)
1031 OBD_ALLOC(reqmsg, req->rq_reqlen);
1033 OBD_FREE(reqcopy, sizeof *reqcopy);
1038 reqcopy->rq_reply_state = NULL;
1039 reqcopy->rq_rep_swab_mask = 0;
1040 reqcopy->rq_pack_bulk = 0;
1041 reqcopy->rq_pack_udesc = 0;
1042 reqcopy->rq_packed_final = 0;
1043 sptlrpc_svc_ctx_addref(reqcopy);
1044 /* We only need the reqmsg for the magic */
1045 reqcopy->rq_reqmsg = reqmsg;
1046 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1048 LASSERT(cfs_atomic_read(&req->rq_refcount));
1049 /** if it is last refcount then early reply isn't needed */
1050 if (cfs_atomic_read(&req->rq_refcount) == 1) {
1051 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1052 "abort sending early reply\n");
1053 GOTO(out, rc = -EINVAL);
1056 /* Connection ref */
1057 reqcopy->rq_export = class_conn2export(
1058 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1059 if (reqcopy->rq_export == NULL)
1060 GOTO(out, rc = -ENODEV);
1063 class_export_rpc_get(reqcopy->rq_export);
1064 if (reqcopy->rq_export->exp_obd &&
1065 reqcopy->rq_export->exp_obd->obd_fail)
1066 GOTO(out_put, rc = -ENODEV);
1068 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1072 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1075 /* Adjust our own deadline to what we told the client */
1076 req->rq_deadline = newdl;
1077 req->rq_early_count++; /* number sent, server side */
1079 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1082 /* Free the (early) reply state from lustre_pack_reply.
1083 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1084 ptlrpc_req_drop_rs(reqcopy);
1087 class_export_rpc_put(reqcopy->rq_export);
1088 class_export_put(reqcopy->rq_export);
1090 sptlrpc_svc_ctx_decref(reqcopy);
1091 OBD_FREE(reqmsg, req->rq_reqlen);
1092 OBD_FREE(reqcopy, sizeof *reqcopy);
1096 /* Send early replies to everybody expiring within at_early_margin
1097 asking for at_extra time */
1098 static int ptlrpc_at_check_timed(struct ptlrpc_service *svc)
1100 struct ptlrpc_request *rq, *n;
1101 cfs_list_t work_list;
1102 struct ptlrpc_at_array *array = &svc->srv_at_array;
1105 time_t now = cfs_time_current_sec();
1106 cfs_duration_t delay;
1107 int first, counter = 0;
1110 cfs_spin_lock(&svc->srv_at_lock);
1111 if (svc->srv_at_check == 0) {
1112 cfs_spin_unlock(&svc->srv_at_lock);
1115 delay = cfs_time_sub(cfs_time_current(), svc->srv_at_checktime);
1116 svc->srv_at_check = 0;
1118 if (array->paa_count == 0) {
1119 cfs_spin_unlock(&svc->srv_at_lock);
1123 /* The timer went off, but maybe the nearest rpc already completed. */
1124 first = array->paa_deadline - now;
1125 if (first > at_early_margin) {
1126 /* We've still got plenty of time. Reset the timer. */
1127 cfs_spin_unlock(&svc->srv_at_lock);
1128 ptlrpc_at_set_timer(svc);
1132 /* We're close to a timeout, and we don't know how much longer the
1133 server will take. Send early replies to everyone expiring soon. */
1134 CFS_INIT_LIST_HEAD(&work_list);
1136 index = (unsigned long)array->paa_deadline % array->paa_size;
1137 count = array->paa_count;
1139 count -= array->paa_reqs_count[index];
1140 cfs_list_for_each_entry_safe(rq, n,
1141 &array->paa_reqs_array[index],
1143 if (rq->rq_deadline <= now + at_early_margin) {
1144 cfs_list_del_init(&rq->rq_timed_list);
1146 * ptlrpc_server_drop_request() may drop
1147 * refcount to 0 already. Let's check this and
1148 * don't add entry to work_list
1150 if (likely(cfs_atomic_inc_not_zero(&rq->rq_refcount)))
1151 cfs_list_add(&rq->rq_timed_list, &work_list);
1153 array->paa_reqs_count[index]--;
1155 cfs_spin_lock(&rq->rq_lock);
1156 rq->rq_at_linked = 0;
1157 cfs_spin_unlock(&rq->rq_lock);
1161 /* update the earliest deadline */
1162 if (deadline == -1 || rq->rq_deadline < deadline)
1163 deadline = rq->rq_deadline;
1168 if (++index >= array->paa_size)
1171 array->paa_deadline = deadline;
1172 cfs_spin_unlock(&svc->srv_at_lock);
1174 /* we have a new earliest deadline, restart the timer */
1175 ptlrpc_at_set_timer(svc);
1177 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1178 "replies\n", first, at_extra, counter);
1180 /* We're already past request deadlines before we even get a
1181 chance to send early replies */
1182 LCONSOLE_WARN("%s: This server is not able to keep up with "
1183 "request traffic (cpu-bound).\n", svc->srv_name);
1184 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1185 "delay="CFS_DURATION_T"(jiff)\n",
1186 counter, svc->srv_n_queued_reqs, svc->srv_n_active_reqs,
1187 at_get(&svc->srv_at_estimate), delay);
1190 /* we took additional refcount so entries can't be deleted from list, no
1191 * locking is needed */
1192 while (!cfs_list_empty(&work_list)) {
1193 rq = cfs_list_entry(work_list.next, struct ptlrpc_request,
1195 cfs_list_del_init(&rq->rq_timed_list);
1197 if (ptlrpc_at_send_early_reply(rq) == 0)
1198 ptlrpc_at_add_timed(rq);
1200 ptlrpc_server_drop_request(rq);
1207 * Put the request to the export list if the request may become
1208 * a high priority one.
1210 static int ptlrpc_hpreq_init(struct ptlrpc_service *svc,
1211 struct ptlrpc_request *req)
1216 if (svc->srv_hpreq_handler) {
1217 rc = svc->srv_hpreq_handler(req);
1221 if (req->rq_export && req->rq_ops) {
1222 cfs_spin_lock_bh(&req->rq_export->exp_rpc_lock);
1223 cfs_list_add(&req->rq_exp_list,
1224 &req->rq_export->exp_queued_rpc);
1225 cfs_spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1231 /** Remove the request from the export list. */
1232 static void ptlrpc_hpreq_fini(struct ptlrpc_request *req)
1235 if (req->rq_export && req->rq_ops) {
1236 cfs_spin_lock_bh(&req->rq_export->exp_rpc_lock);
1237 cfs_list_del_init(&req->rq_exp_list);
1238 cfs_spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1244 * Make the request a high priority one.
1246 * All the high priority requests are queued in a separate FIFO
1247 * ptlrpc_service::srv_request_hpq list which is parallel to
1248 * ptlrpc_service::srv_request_queue list but has a higher priority
1251 * \see ptlrpc_server_handle_request().
1253 static void ptlrpc_hpreq_reorder_nolock(struct ptlrpc_service *svc,
1254 struct ptlrpc_request *req)
1257 LASSERT(svc != NULL);
1258 cfs_spin_lock(&req->rq_lock);
1259 if (req->rq_hp == 0) {
1260 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1262 /* Add to the high priority queue. */
1263 cfs_list_move_tail(&req->rq_list, &svc->srv_request_hpq);
1265 if (opc != OBD_PING)
1266 DEBUG_REQ(D_NET, req, "high priority req");
1268 cfs_spin_unlock(&req->rq_lock);
1273 * \see ptlrpc_hpreq_reorder_nolock
1275 void ptlrpc_hpreq_reorder(struct ptlrpc_request *req)
1277 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
1280 cfs_spin_lock(&svc->srv_rq_lock);
1281 /* It may happen that the request is already taken for the processing
1282 * but still in the export list, do not re-add it into the HP list. */
1283 if (req->rq_phase == RQ_PHASE_NEW)
1284 ptlrpc_hpreq_reorder_nolock(svc, req);
1285 cfs_spin_unlock(&svc->srv_rq_lock);
1289 /** Check if the request is a high priority one. */
1290 static int ptlrpc_server_hpreq_check(struct ptlrpc_request *req)
1295 /* Check by request opc. */
1296 opc = lustre_msg_get_opc(req->rq_reqmsg);
1297 if (opc == OBD_PING)
1300 /* Perform request specific check. */
1301 if (req->rq_ops && req->rq_ops->hpreq_check)
1302 rc = req->rq_ops->hpreq_check(req);
1306 /** Check if a request is a high priority one. */
1307 static int ptlrpc_server_request_add(struct ptlrpc_service *svc,
1308 struct ptlrpc_request *req)
1313 rc = ptlrpc_server_hpreq_check(req);
1317 cfs_spin_lock(&svc->srv_rq_lock);
1318 /* Before inserting the request into the queue, check if it is not
1319 * inserted yet, or even already handled -- it may happen due to
1320 * a racing ldlm_server_blocking_ast(). */
1321 if (req->rq_phase == RQ_PHASE_NEW && cfs_list_empty(&req->rq_list)) {
1323 ptlrpc_hpreq_reorder_nolock(svc, req);
1325 cfs_list_add_tail(&req->rq_list,
1326 &svc->srv_request_queue);
1328 cfs_spin_unlock(&svc->srv_rq_lock);
1334 * Allow to handle high priority request
1335 * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock
1336 * to get reliable result
1338 static int ptlrpc_server_allow_high(struct ptlrpc_service *svc, int force)
1343 if (svc->srv_n_active_reqs >= svc->srv_threads_running - 1)
1346 return cfs_list_empty(&svc->srv_request_queue) ||
1347 svc->srv_hpreq_count < svc->srv_hpreq_ratio;
1350 static int ptlrpc_server_high_pending(struct ptlrpc_service *svc, int force)
1352 return ptlrpc_server_allow_high(svc, force) &&
1353 !cfs_list_empty(&svc->srv_request_hpq);
1357 * Only allow normal priority requests on a service that has a high-priority
1358 * queue if forced (i.e. cleanup), if there are other high priority requests
1359 * already being processed (i.e. those threads can service more high-priority
1360 * requests), or if there are enough idle threads that a later thread can do
1361 * a high priority request.
1362 * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock
1363 * to get reliable result
1365 static int ptlrpc_server_allow_normal(struct ptlrpc_service *svc, int force)
1368 if (1) /* always allow to handle normal request for liblustre */
1372 svc->srv_n_active_reqs < svc->srv_threads_running - 2)
1375 if (svc->srv_n_active_reqs >= svc->srv_threads_running - 1)
1378 return svc->srv_n_active_hpreq > 0 || svc->srv_hpreq_handler == NULL;
1381 static int ptlrpc_server_normal_pending(struct ptlrpc_service *svc, int force)
1383 return ptlrpc_server_allow_normal(svc, force) &&
1384 !cfs_list_empty(&svc->srv_request_queue);
1388 * Returns true if there are requests available in incoming
1389 * request queue for processing and it is allowed to fetch them.
1390 * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock
1391 * to get reliable result
1392 * \see ptlrpc_server_allow_normal
1393 * \see ptlrpc_server_allow high
1396 ptlrpc_server_request_pending(struct ptlrpc_service *svc, int force)
1398 return ptlrpc_server_high_pending(svc, force) ||
1399 ptlrpc_server_normal_pending(svc, force);
1403 * Fetch a request for processing from queue of unprocessed requests.
1404 * Favors high-priority requests.
1405 * Returns a pointer to fetched request.
1407 static struct ptlrpc_request *
1408 ptlrpc_server_request_get(struct ptlrpc_service *svc, int force)
1410 struct ptlrpc_request *req;
1413 if (ptlrpc_server_high_pending(svc, force)) {
1414 req = cfs_list_entry(svc->srv_request_hpq.next,
1415 struct ptlrpc_request, rq_list);
1416 svc->srv_hpreq_count++;
1421 if (ptlrpc_server_normal_pending(svc, force)) {
1422 req = cfs_list_entry(svc->srv_request_queue.next,
1423 struct ptlrpc_request, rq_list);
1424 svc->srv_hpreq_count = 0;
1431 * Handle freshly incoming reqs, add to timed early reply list,
1432 * pass on to regular request queue.
1433 * All incoming requests pass through here before getting into
1434 * ptlrpc_server_handle_req later on.
1437 ptlrpc_server_handle_req_in(struct ptlrpc_service *svc)
1439 struct ptlrpc_request *req;
1446 cfs_spin_lock(&svc->srv_lock);
1447 if (cfs_list_empty(&svc->srv_req_in_queue)) {
1448 cfs_spin_unlock(&svc->srv_lock);
1452 req = cfs_list_entry(svc->srv_req_in_queue.next,
1453 struct ptlrpc_request, rq_list);
1454 cfs_list_del_init (&req->rq_list);
1455 svc->srv_n_queued_reqs--;
1456 /* Consider this still a "queued" request as far as stats are
1458 /* ptlrpc_hpreq_init() inserts it to the export list and by the time
1459 * of ptlrpc_server_request_add() it could be already handled and
1460 * released. To not lose request in between, take an extra reference
1461 * on the request. */
1462 ptlrpc_request_addref(req);
1463 cfs_spin_unlock(&svc->srv_lock);
1465 /* go through security check/transform */
1466 rc = sptlrpc_svc_unwrap_request(req);
1470 case SECSVC_COMPLETE:
1471 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1480 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1481 * redo it wouldn't be harmful.
1483 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1484 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1486 CERROR("error unpacking request: ptl %d from %s "
1487 "x"LPU64"\n", svc->srv_req_portal,
1488 libcfs_id2str(req->rq_peer), req->rq_xid);
1493 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1495 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1496 LPU64"\n", svc->srv_req_portal,
1497 libcfs_id2str(req->rq_peer), req->rq_xid);
1501 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1502 lustre_msg_get_opc(req->rq_reqmsg) == obd_fail_val) {
1503 CERROR("drop incoming rpc opc %u, x"LPU64"\n",
1504 obd_fail_val, req->rq_xid);
1509 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1510 CERROR("wrong packet type received (type=%u) from %s\n",
1511 lustre_msg_get_type(req->rq_reqmsg),
1512 libcfs_id2str(req->rq_peer));
1516 switch(lustre_msg_get_opc(req->rq_reqmsg)) {
1519 req->rq_bulk_write = 1;
1523 req->rq_bulk_read = 1;
1527 CDEBUG(D_NET, "got req "LPU64"\n", req->rq_xid);
1529 req->rq_export = class_conn2export(
1530 lustre_msg_get_handle(req->rq_reqmsg));
1531 if (req->rq_export) {
1532 rc = ptlrpc_check_req(req);
1534 rc = sptlrpc_target_export_check(req->rq_export, req);
1536 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1537 "illegal security flavor,");
1542 ptlrpc_update_export_timer(req->rq_export, 0);
1545 /* req_in handling should/must be fast */
1546 if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
1547 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1548 cfs_time_sub(cfs_time_current_sec(),
1549 req->rq_arrival_time.tv_sec));
1551 /* Set rpc server deadline and add it to the timed list */
1552 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1553 MSGHDR_AT_SUPPORT) ?
1554 /* The max time the client expects us to take */
1555 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1556 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1557 if (unlikely(deadline == 0)) {
1558 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1562 ptlrpc_at_add_timed(req);
1563 rc = ptlrpc_hpreq_init(svc, req);
1567 /* Move it over to the request processing queue */
1568 rc = ptlrpc_server_request_add(svc, req);
1571 cfs_waitq_signal(&svc->srv_waitq);
1572 ptlrpc_server_drop_request(req);
1576 ptlrpc_server_drop_request(req);
1577 cfs_spin_lock(&svc->srv_rq_lock);
1578 svc->srv_n_active_reqs++;
1579 cfs_spin_unlock(&svc->srv_rq_lock);
1580 ptlrpc_server_finish_request(svc, req);
1586 * Main incoming request handling logic.
1587 * Calls handler function from service to do actual processing.
1590 ptlrpc_server_handle_request(struct ptlrpc_service *svc,
1591 struct ptlrpc_thread *thread)
1593 struct obd_export *export = NULL;
1594 struct ptlrpc_request *request;
1595 struct timeval work_start;
1596 struct timeval work_end;
1604 cfs_spin_lock(&svc->srv_rq_lock);
1606 /* !@%$# liblustre only has 1 thread */
1607 if (cfs_atomic_read(&svc->srv_n_difficult_replies) != 0) {
1608 cfs_spin_unlock(&svc->srv_rq_lock);
1612 request = ptlrpc_server_request_get(svc, 0);
1613 if (request == NULL) {
1614 cfs_spin_unlock(&svc->srv_rq_lock);
1618 opc = lustre_msg_get_opc(request->rq_reqmsg);
1619 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1620 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1621 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1622 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1624 if (unlikely(fail_opc)) {
1625 if (request->rq_export && request->rq_ops) {
1626 cfs_spin_unlock(&svc->srv_rq_lock);
1627 OBD_FAIL_TIMEOUT(fail_opc, 4);
1628 cfs_spin_lock(&svc->srv_rq_lock);
1629 request = ptlrpc_server_request_get(svc, 0);
1630 if (request == NULL) {
1631 cfs_spin_unlock(&svc->srv_rq_lock);
1637 cfs_list_del_init(&request->rq_list);
1638 svc->srv_n_active_reqs++;
1640 svc->srv_n_active_hpreq++;
1642 /* The phase is changed under the lock here because we need to know
1643 * the request is under processing (see ptlrpc_hpreq_reorder()). */
1644 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1645 cfs_spin_unlock(&svc->srv_rq_lock);
1647 ptlrpc_hpreq_fini(request);
1649 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1650 libcfs_debug_dumplog();
1652 cfs_gettimeofday(&work_start);
1653 timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
1654 if (likely(svc->srv_stats != NULL)) {
1655 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1657 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1658 svc->srv_n_queued_reqs);
1659 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1660 svc->srv_n_active_reqs);
1661 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1662 at_get(&svc->srv_at_estimate));
1665 rc = lu_context_init(&request->rq_session,
1666 LCT_SESSION|LCT_REMEMBER|LCT_NOREF);
1668 CERROR("Failure to initialize session: %d\n", rc);
1671 request->rq_session.lc_thread = thread;
1672 request->rq_session.lc_cookie = 0x5;
1673 lu_context_enter(&request->rq_session);
1675 CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
1677 request->rq_svc_thread = thread;
1679 request->rq_svc_thread->t_env->le_ses = &request->rq_session;
1681 if (likely(request->rq_export)) {
1682 if (unlikely(ptlrpc_check_req(request)))
1684 ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
1685 export = class_export_rpc_get(request->rq_export);
1688 /* Discard requests queued for longer than the deadline.
1689 The deadline is increased if we send an early reply. */
1690 if (cfs_time_current_sec() > request->rq_deadline) {
1691 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
1692 ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
1693 libcfs_id2str(request->rq_peer),
1694 cfs_time_sub(request->rq_deadline,
1695 request->rq_arrival_time.tv_sec),
1696 cfs_time_sub(cfs_time_current_sec(),
1697 request->rq_deadline));
1698 goto put_rpc_export;
1701 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
1702 "%s:%s+%d:%d:x"LPU64":%s:%d\n", cfs_curproc_comm(),
1703 (request->rq_export ?
1704 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1705 (request->rq_export ?
1706 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
1707 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1708 libcfs_id2str(request->rq_peer),
1709 lustre_msg_get_opc(request->rq_reqmsg));
1711 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1712 OBD_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, obd_fail_val);
1714 rc = svc->srv_handler(request);
1716 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1720 class_export_rpc_put(export);
1722 lu_context_exit(&request->rq_session);
1723 lu_context_fini(&request->rq_session);
1725 if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
1726 DEBUG_REQ(D_WARNING, request, "Request x"LPU64" took longer "
1727 "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
1728 " client may timeout.",
1729 request->rq_xid, cfs_time_sub(request->rq_deadline,
1730 request->rq_arrival_time.tv_sec),
1731 cfs_time_sub(cfs_time_current_sec(),
1732 request->rq_deadline));
1735 cfs_gettimeofday(&work_end);
1736 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
1737 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
1738 "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in "
1739 "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
1741 (request->rq_export ?
1742 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1743 (request->rq_export ?
1744 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
1745 lustre_msg_get_status(request->rq_reqmsg),
1747 libcfs_id2str(request->rq_peer),
1748 lustre_msg_get_opc(request->rq_reqmsg),
1750 cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
1751 (request->rq_repmsg ?
1752 lustre_msg_get_transno(request->rq_repmsg) :
1753 request->rq_transno),
1755 (request->rq_repmsg ?
1756 lustre_msg_get_status(request->rq_repmsg) : -999));
1757 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
1758 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
1759 int opc = opcode_offset(op);
1760 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
1761 LASSERT(opc < LUSTRE_MAX_OPCODES);
1762 lprocfs_counter_add(svc->srv_stats,
1763 opc + EXTRA_MAX_OPCODES,
1767 if (unlikely(request->rq_early_count)) {
1768 DEBUG_REQ(D_ADAPTTO, request,
1769 "sent %d early replies before finishing in "
1771 request->rq_early_count,
1772 cfs_time_sub(work_end.tv_sec,
1773 request->rq_arrival_time.tv_sec));
1777 ptlrpc_server_finish_request(svc, request);
1783 * An internal function to process a single reply state object.
1786 ptlrpc_handle_rs (struct ptlrpc_reply_state *rs)
1788 struct ptlrpc_service *svc = rs->rs_service;
1789 struct obd_export *exp;
1790 struct obd_device *obd;
1795 exp = rs->rs_export;
1798 LASSERT (rs->rs_difficult);
1799 LASSERT (rs->rs_scheduled);
1800 LASSERT (cfs_list_empty(&rs->rs_list));
1802 cfs_spin_lock (&exp->exp_lock);
1803 /* Noop if removed already */
1804 cfs_list_del_init (&rs->rs_exp_list);
1805 cfs_spin_unlock (&exp->exp_lock);
1807 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1808 * iterates over newly committed replies, removing them from
1809 * exp_uncommitted_replies. It then drops this lock and schedules the
1810 * replies it found for handling here.
1812 * We can avoid contention for exp_uncommitted_replies_lock between the
1813 * HRT threads and further commit callbacks by checking rs_committed
1814 * which is set in the commit callback while it holds both
1815 * rs_lock and exp_uncommitted_reples.
1817 * If we see rs_committed clear, the commit callback _may_ not have
1818 * handled this reply yet and we race with it to grab
1819 * exp_uncommitted_replies_lock before removing the reply from
1820 * exp_uncommitted_replies. Note that if we lose the race and the
1821 * reply has already been removed, list_del_init() is a noop.
1823 * If we see rs_committed set, we know the commit callback is handling,
1824 * or has handled this reply since store reordering might allow us to
1825 * see rs_committed set out of sequence. But since this is done
1826 * holding rs_lock, we can be sure it has all completed once we hold
1827 * rs_lock, which we do right next.
1829 if (!rs->rs_committed) {
1830 cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
1831 cfs_list_del_init(&rs->rs_obd_list);
1832 cfs_spin_unlock(&exp->exp_uncommitted_replies_lock);
1835 cfs_spin_lock(&rs->rs_lock);
1837 been_handled = rs->rs_handled;
1840 nlocks = rs->rs_nlocks; /* atomic "steal", but */
1841 rs->rs_nlocks = 0; /* locks still on rs_locks! */
1843 if (nlocks == 0 && !been_handled) {
1844 /* If we see this, we should already have seen the warning
1845 * in mds_steal_ack_locks() */
1846 CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
1849 rs->rs_xid, rs->rs_transno, rs->rs_opc,
1850 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1853 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
1854 cfs_spin_unlock(&rs->rs_lock);
1856 if (!been_handled && rs->rs_on_net) {
1857 LNetMDUnlink(rs->rs_md_h);
1858 /* Ignore return code; we're racing with
1862 while (nlocks-- > 0)
1863 ldlm_lock_decref(&rs->rs_locks[nlocks],
1864 rs->rs_modes[nlocks]);
1866 cfs_spin_lock(&rs->rs_lock);
1869 rs->rs_scheduled = 0;
1871 if (!rs->rs_on_net) {
1873 cfs_spin_unlock(&rs->rs_lock);
1875 class_export_put (exp);
1876 rs->rs_export = NULL;
1877 ptlrpc_rs_decref (rs);
1878 if (cfs_atomic_dec_and_test(&svc->srv_n_difficult_replies) &&
1879 svc->srv_is_stopping)
1880 cfs_waitq_broadcast(&svc->srv_waitq);
1884 /* still on the net; callback will schedule */
1885 cfs_spin_unlock(&rs->rs_lock);
1892 * Check whether given service has a reply available for processing
1895 * \param svc a ptlrpc service
1896 * \retval 0 no replies processed
1897 * \retval 1 one reply processed
1900 ptlrpc_server_handle_reply(struct ptlrpc_service *svc)
1902 struct ptlrpc_reply_state *rs = NULL;
1905 cfs_spin_lock(&svc->srv_rs_lock);
1906 if (!cfs_list_empty(&svc->srv_reply_queue)) {
1907 rs = cfs_list_entry(svc->srv_reply_queue.prev,
1908 struct ptlrpc_reply_state,
1910 cfs_list_del_init(&rs->rs_list);
1912 cfs_spin_unlock(&svc->srv_rs_lock);
1914 ptlrpc_handle_rs(rs);
1918 /* FIXME make use of timeout later */
1920 liblustre_check_services (void *arg)
1922 int did_something = 0;
1924 cfs_list_t *tmp, *nxt;
1927 /* I'm relying on being single threaded, not to have to lock
1928 * ptlrpc_all_services etc */
1929 cfs_list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
1930 struct ptlrpc_service *svc =
1931 cfs_list_entry (tmp, struct ptlrpc_service, srv_list);
1933 if (svc->srv_threads_running != 0) /* I've recursed */
1936 /* service threads can block for bulk, so this limits us
1937 * (arbitrarily) to recursing 1 stack frame per service.
1938 * Note that the problem with recursion is that we have to
1939 * unwind completely before our caller can resume. */
1941 svc->srv_threads_running++;
1944 rc = ptlrpc_server_handle_req_in(svc);
1945 rc |= ptlrpc_server_handle_reply(svc);
1946 rc |= ptlrpc_at_check_timed(svc);
1947 rc |= ptlrpc_server_handle_request(svc, NULL);
1948 rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
1949 did_something |= rc;
1952 svc->srv_threads_running--;
1955 RETURN(did_something);
1957 #define ptlrpc_stop_all_threads(s) do {} while (0)
1959 #else /* __KERNEL__ */
1962 ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
1964 int avail = svc->srv_nrqbd_receiving;
1965 int low_water = test_req_buffer_pressure ? 0 :
1966 svc->srv_nbuf_per_group/2;
1968 /* NB I'm not locking; just looking. */
1970 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1971 * allowed the request history to grow out of control. We could put a
1972 * sanity check on that here and cull some history if we need the
1975 if (avail <= low_water)
1976 ptlrpc_grow_req_bufs(svc);
1979 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
1984 ptlrpc_retry_rqbds(void *arg)
1986 struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
1988 svc->srv_rqbd_timeout = 0;
1989 return (-ETIMEDOUT);
1993 ptlrpc_threads_enough(struct ptlrpc_service *svc)
1995 return svc->srv_n_active_reqs <
1996 svc->srv_threads_running - 1 - (svc->srv_hpreq_handler != NULL);
2000 * allowed to create more threads
2001 * user can call it w/o any lock but need to hold ptlrpc_service::srv_lock to
2002 * get reliable result
2005 ptlrpc_threads_increasable(struct ptlrpc_service *svc)
2007 return svc->srv_threads_running +
2008 svc->srv_threads_starting < svc->srv_threads_max;
2012 * too many requests and allowed to create more threads
2015 ptlrpc_threads_need_create(struct ptlrpc_service *svc)
2017 return !ptlrpc_threads_enough(svc) && ptlrpc_threads_increasable(svc);
2021 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2023 return (thread->t_flags & SVC_STOPPING) != 0 ||
2024 thread->t_svc->srv_is_stopping;
2028 ptlrpc_rqbd_pending(struct ptlrpc_service *svc)
2030 return !cfs_list_empty(&svc->srv_idle_rqbds) &&
2031 svc->srv_rqbd_timeout == 0;
2035 ptlrpc_at_check(struct ptlrpc_service *svc)
2037 return svc->srv_at_check;
2041 * requests wait on preprocessing
2042 * user can call it w/o any lock but need to hold ptlrpc_service::srv_lock to
2043 * get reliable result
2046 ptlrpc_server_request_waiting(struct ptlrpc_service *svc)
2048 return !cfs_list_empty(&svc->srv_req_in_queue);
2051 static __attribute__((__noinline__)) int
2052 ptlrpc_wait_event(struct ptlrpc_service *svc,
2053 struct ptlrpc_thread *thread)
2055 /* Don't exit while there are replies to be handled */
2056 struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
2057 ptlrpc_retry_rqbds, svc);
2059 lc_watchdog_disable(thread->t_watchdog);
2063 l_wait_event_exclusive_head(svc->srv_waitq,
2064 ptlrpc_thread_stopping(thread) ||
2065 ptlrpc_server_request_waiting(svc) ||
2066 ptlrpc_server_request_pending(svc, 0) ||
2067 ptlrpc_rqbd_pending(svc) ||
2068 ptlrpc_at_check(svc), &lwi);
2070 if (ptlrpc_thread_stopping(thread))
2073 lc_watchdog_touch(thread->t_watchdog, CFS_GET_TIMEOUT(svc));
2079 * Main thread body for service threads.
2080 * Waits in a loop waiting for new requests to process to appear.
2081 * Every time an incoming requests is added to its queue, a waitq
2082 * is woken up and one of the threads will handle it.
2084 static int ptlrpc_main(void *arg)
2086 struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
2087 struct ptlrpc_service *svc = data->svc;
2088 struct ptlrpc_thread *thread = data->thread;
2089 struct ptlrpc_reply_state *rs;
2090 #ifdef WITH_GROUP_INFO
2091 cfs_group_info_t *ginfo = NULL;
2094 int counter = 0, rc = 0;
2097 thread->t_pid = cfs_curproc_pid();
2098 cfs_daemonize_ctxt(data->name);
2100 #if defined(HAVE_NODE_TO_CPUMASK) && defined(CONFIG_NUMA)
2101 /* we need to do this before any per-thread allocation is done so that
2102 * we get the per-thread allocations on local node. bug 7342 */
2103 if (svc->srv_cpu_affinity) {
2106 for (cpu = 0, num_cpu = 0; cpu < cfs_num_possible_cpus();
2108 if (!cfs_cpu_online(cpu))
2110 if (num_cpu == thread->t_id % cfs_num_online_cpus())
2114 cfs_set_cpus_allowed(cfs_current(),
2115 node_to_cpumask(cpu_to_node(cpu)));
2119 #ifdef WITH_GROUP_INFO
2120 ginfo = cfs_groups_alloc(0);
2126 cfs_set_current_groups(ginfo);
2127 cfs_put_group_info(ginfo);
2130 if (svc->srv_init != NULL) {
2131 rc = svc->srv_init(thread);
2136 rc = lu_context_init(&env.le_ctx,
2137 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2141 thread->t_env = &env;
2142 env.le_ctx.lc_thread = thread;
2143 env.le_ctx.lc_cookie = 0x6;
2145 /* Alloc reply state structure for this one */
2146 OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
2152 cfs_spin_lock(&svc->srv_lock);
2154 LASSERT((thread->t_flags & SVC_STARTING) != 0);
2155 thread->t_flags &= ~SVC_STARTING;
2156 svc->srv_threads_starting--;
2158 /* SVC_STOPPING may already be set here if someone else is trying
2159 * to stop the service while this new thread has been dynamically
2160 * forked. We still set SVC_RUNNING to let our creator know that
2161 * we are now running, however we will exit as soon as possible */
2162 thread->t_flags |= SVC_RUNNING;
2163 svc->srv_threads_running++;
2164 cfs_spin_unlock(&svc->srv_lock);
2167 * wake up our creator. Note: @data is invalid after this point,
2168 * because it's allocated on ptlrpc_start_thread() stack.
2170 cfs_waitq_signal(&thread->t_ctl_waitq);
2172 thread->t_watchdog = lc_watchdog_add(CFS_GET_TIMEOUT(svc), NULL, NULL);
2174 cfs_spin_lock(&svc->srv_rs_lock);
2175 cfs_list_add(&rs->rs_list, &svc->srv_free_rs_list);
2176 cfs_waitq_signal(&svc->srv_free_rs_waitq);
2177 cfs_spin_unlock(&svc->srv_rs_lock);
2179 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2180 svc->srv_threads_running);
2182 /* XXX maintain a list of all managed devices: insert here */
2183 while (!ptlrpc_thread_stopping(thread)) {
2184 if (ptlrpc_wait_event(svc, thread))
2187 ptlrpc_check_rqbd_pool(svc);
2189 if (ptlrpc_threads_need_create(svc)) {
2190 /* Ignore return code - we tried... */
2191 ptlrpc_start_thread(svc);
2194 /* Process all incoming reqs before handling any */
2195 if (ptlrpc_server_request_waiting(svc)) {
2196 ptlrpc_server_handle_req_in(svc);
2197 /* but limit ourselves in case of flood */
2198 if (counter++ < 100)
2203 if (ptlrpc_at_check(svc))
2204 ptlrpc_at_check_timed(svc);
2206 if (ptlrpc_server_request_pending(svc, 0)) {
2207 lu_context_enter(&env.le_ctx);
2208 ptlrpc_server_handle_request(svc, thread);
2209 lu_context_exit(&env.le_ctx);
2212 if (ptlrpc_rqbd_pending(svc) &&
2213 ptlrpc_server_post_idle_rqbds(svc) < 0) {
2214 /* I just failed to repost request buffers.
2215 * Wait for a timeout (unless something else
2216 * happens) before I try again */
2217 svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
2218 CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
2219 svc->srv_nrqbd_receiving);
2223 lc_watchdog_delete(thread->t_watchdog);
2224 thread->t_watchdog = NULL;
2228 * deconstruct service specific state created by ptlrpc_start_thread()
2230 if (svc->srv_done != NULL)
2231 svc->srv_done(thread);
2233 lu_context_fini(&env.le_ctx);
2235 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2236 thread, thread->t_pid, thread->t_id, rc);
2238 cfs_spin_lock(&svc->srv_lock);
2239 if ((thread->t_flags & SVC_STARTING) != 0) {
2240 svc->srv_threads_starting--;
2241 thread->t_flags &= ~SVC_STARTING;
2244 if ((thread->t_flags & SVC_RUNNING) != 0) {
2245 /* must know immediately */
2246 svc->srv_threads_running--;
2247 thread->t_flags &= ~SVC_RUNNING;
2251 thread->t_flags |= SVC_STOPPED;
2253 cfs_waitq_signal(&thread->t_ctl_waitq);
2254 cfs_spin_unlock(&svc->srv_lock);
2259 struct ptlrpc_hr_args {
2262 struct ptlrpc_hr_service *hrs;
2265 static int hrt_dont_sleep(struct ptlrpc_hr_thread *t,
2266 cfs_list_t *replies)
2270 cfs_spin_lock(&t->hrt_lock);
2271 cfs_list_splice_init(&t->hrt_queue, replies);
2272 result = cfs_test_bit(HRT_STOPPING, &t->hrt_flags) ||
2273 !cfs_list_empty(replies);
2274 cfs_spin_unlock(&t->hrt_lock);
2279 * Main body of "handle reply" function.
2280 * It processes acked reply states
2282 static int ptlrpc_hr_main(void *arg)
2284 struct ptlrpc_hr_args * hr_args = arg;
2285 struct ptlrpc_hr_service *hr = hr_args->hrs;
2286 struct ptlrpc_hr_thread *t = &hr->hr_threads[hr_args->thread_index];
2287 char threadname[20];
2288 CFS_LIST_HEAD(replies);
2290 snprintf(threadname, sizeof(threadname),
2291 "ptlrpc_hr_%d", hr_args->thread_index);
2293 cfs_daemonize_ctxt(threadname);
2294 #if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
2295 cfs_set_cpus_allowed(cfs_current(),
2296 node_to_cpumask(cpu_to_node(hr_args->cpu_index)));
2298 cfs_set_bit(HRT_RUNNING, &t->hrt_flags);
2299 cfs_waitq_signal(&t->hrt_wait);
2301 while (!cfs_test_bit(HRT_STOPPING, &t->hrt_flags)) {
2303 l_wait_condition(t->hrt_wait, hrt_dont_sleep(t, &replies));
2304 while (!cfs_list_empty(&replies)) {
2305 struct ptlrpc_reply_state *rs;
2307 rs = cfs_list_entry(replies.prev,
2308 struct ptlrpc_reply_state,
2310 cfs_list_del_init(&rs->rs_list);
2311 ptlrpc_handle_rs(rs);
2315 cfs_clear_bit(HRT_RUNNING, &t->hrt_flags);
2316 cfs_complete(&t->hrt_completion);
2321 static int ptlrpc_start_hr_thread(struct ptlrpc_hr_service *hr, int n, int cpu)
2323 struct ptlrpc_hr_thread *t = &hr->hr_threads[n];
2324 struct ptlrpc_hr_args args;
2328 args.thread_index = n;
2329 args.cpu_index = cpu;
2332 rc = cfs_kernel_thread(ptlrpc_hr_main, (void*)&args,
2333 CLONE_VM|CLONE_FILES);
2335 cfs_complete(&t->hrt_completion);
2338 l_wait_condition(t->hrt_wait, cfs_test_bit(HRT_RUNNING, &t->hrt_flags));
2344 static void ptlrpc_stop_hr_thread(struct ptlrpc_hr_thread *t)
2348 cfs_set_bit(HRT_STOPPING, &t->hrt_flags);
2349 cfs_waitq_signal(&t->hrt_wait);
2350 cfs_wait_for_completion(&t->hrt_completion);
2355 static void ptlrpc_stop_hr_threads(struct ptlrpc_hr_service *hrs)
2360 for (n = 0; n < hrs->hr_n_threads; n++)
2361 ptlrpc_stop_hr_thread(&hrs->hr_threads[n]);
2366 static int ptlrpc_start_hr_threads(struct ptlrpc_hr_service *hr)
2369 int n, cpu, threads_started = 0;
2372 LASSERT(hr != NULL);
2373 LASSERT(hr->hr_n_threads > 0);
2375 for (n = 0, cpu = 0; n < hr->hr_n_threads; n++) {
2376 #if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
2377 while(!cfs_cpu_online(cpu)) {
2379 if (cpu >= cfs_num_possible_cpus())
2383 rc = ptlrpc_start_hr_thread(hr, n, cpu);
2389 if (threads_started == 0) {
2390 CERROR("No reply handling threads started\n");
2393 if (threads_started < hr->hr_n_threads) {
2394 CWARN("Started only %d reply handling threads from %d\n",
2395 threads_started, hr->hr_n_threads);
2396 hr->hr_n_threads = threads_started;
2401 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
2402 struct ptlrpc_thread *thread)
2404 struct l_wait_info lwi = { 0 };
2407 CDEBUG(D_RPCTRACE, "Stopping thread [ %p : %u ]\n",
2408 thread, thread->t_pid);
2410 cfs_spin_lock(&svc->srv_lock);
2411 /* let the thread know that we would like it to stop asap */
2412 thread->t_flags |= SVC_STOPPING;
2413 cfs_spin_unlock(&svc->srv_lock);
2415 cfs_waitq_broadcast(&svc->srv_waitq);
2416 l_wait_event(thread->t_ctl_waitq,
2417 (thread->t_flags & SVC_STOPPED), &lwi);
2419 cfs_spin_lock(&svc->srv_lock);
2420 cfs_list_del(&thread->t_link);
2421 cfs_spin_unlock(&svc->srv_lock);
2423 OBD_FREE_PTR(thread);
2428 * Stops all threads of a particular service \a svc
2430 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2432 struct ptlrpc_thread *thread;
2435 cfs_spin_lock(&svc->srv_lock);
2436 while (!cfs_list_empty(&svc->srv_threads)) {
2437 thread = cfs_list_entry(svc->srv_threads.next,
2438 struct ptlrpc_thread, t_link);
2440 cfs_spin_unlock(&svc->srv_lock);
2441 ptlrpc_stop_thread(svc, thread);
2442 cfs_spin_lock(&svc->srv_lock);
2445 cfs_spin_unlock(&svc->srv_lock);
2449 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2454 /* We require 2 threads min - see note in
2455 ptlrpc_server_handle_request */
2456 LASSERT(svc->srv_threads_min >= 2);
2457 for (i = 0; i < svc->srv_threads_min; i++) {
2458 rc = ptlrpc_start_thread(svc);
2459 /* We have enough threads, don't start more. b=15759 */
2460 if (rc == -EMFILE) {
2465 CERROR("cannot start %s thread #%d: rc %d\n",
2466 svc->srv_thread_name, i, rc);
2467 ptlrpc_stop_all_threads(svc);
2474 int ptlrpc_start_thread(struct ptlrpc_service *svc)
2476 struct l_wait_info lwi = { 0 };
2477 struct ptlrpc_svc_data d;
2478 struct ptlrpc_thread *thread;
2483 CDEBUG(D_RPCTRACE, "%s started %d min %d max %d running %d\n",
2484 svc->srv_name, svc->srv_threads_running, svc->srv_threads_min,
2485 svc->srv_threads_max, svc->srv_threads_running);
2487 if (unlikely(svc->srv_is_stopping))
2490 if (!ptlrpc_threads_increasable(svc) ||
2491 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2492 svc->srv_threads_running == svc->srv_threads_min - 1))
2495 OBD_ALLOC_PTR(thread);
2498 cfs_waitq_init(&thread->t_ctl_waitq);
2500 cfs_spin_lock(&svc->srv_lock);
2501 if (!ptlrpc_threads_increasable(svc)) {
2502 cfs_spin_unlock(&svc->srv_lock);
2503 OBD_FREE_PTR(thread);
2507 svc->srv_threads_starting++;
2508 thread->t_id = svc->srv_threads_next_id++;
2509 thread->t_flags |= SVC_STARTING;
2510 thread->t_svc = svc;
2512 cfs_list_add(&thread->t_link, &svc->srv_threads);
2513 cfs_spin_unlock(&svc->srv_lock);
2515 sprintf(name, "%s_%02d", svc->srv_thread_name, thread->t_id);
2520 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", name);
2522 /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
2523 * just drop the VM and FILES in cfs_daemonize_ctxt() right away.
2525 rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
2527 CERROR("cannot start thread '%s': rc %d\n", name, rc);
2529 cfs_spin_lock(&svc->srv_lock);
2530 cfs_list_del(&thread->t_link);
2531 --svc->srv_threads_starting;
2532 cfs_spin_unlock(&svc->srv_lock);
2534 OBD_FREE(thread, sizeof(*thread));
2537 l_wait_event(thread->t_ctl_waitq,
2538 thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
2540 rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
2545 int ptlrpc_hr_init(void)
2548 int n_cpus = cfs_num_online_cpus();
2549 struct ptlrpc_hr_service *hr;
2554 LASSERT(ptlrpc_hr == NULL);
2556 size = offsetof(struct ptlrpc_hr_service, hr_threads[n_cpus]);
2557 OBD_ALLOC(hr, size);
2560 for (i = 0; i < n_cpus; i++) {
2561 struct ptlrpc_hr_thread *t = &hr->hr_threads[i];
2563 cfs_spin_lock_init(&t->hrt_lock);
2564 cfs_waitq_init(&t->hrt_wait);
2565 CFS_INIT_LIST_HEAD(&t->hrt_queue);
2566 cfs_init_completion(&t->hrt_completion);
2568 hr->hr_n_threads = n_cpus;
2572 rc = ptlrpc_start_hr_threads(hr);
2574 OBD_FREE(hr, hr->hr_size);
2580 void ptlrpc_hr_fini(void)
2582 if (ptlrpc_hr != NULL) {
2583 ptlrpc_stop_hr_threads(ptlrpc_hr);
2584 OBD_FREE(ptlrpc_hr, ptlrpc_hr->hr_size);
2589 #endif /* __KERNEL__ */
2592 * Wait until all already scheduled replies are processed.
2594 static void ptlrpc_wait_replies(struct ptlrpc_service *svc)
2598 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2600 rc = l_wait_event(svc->srv_waitq, cfs_atomic_read(&svc-> \
2601 srv_n_difficult_replies) == 0,
2605 CWARN("Unexpectedly long timeout %p\n", svc);
2609 int ptlrpc_unregister_service(struct ptlrpc_service *service)
2612 struct l_wait_info lwi;
2614 struct ptlrpc_reply_state *rs, *t;
2615 struct ptlrpc_at_array *array = &service->srv_at_array;
2618 service->srv_is_stopping = 1;
2619 cfs_timer_disarm(&service->srv_at_timer);
2621 ptlrpc_stop_all_threads(service);
2622 LASSERT(cfs_list_empty(&service->srv_threads));
2624 cfs_spin_lock (&ptlrpc_all_services_lock);
2625 cfs_list_del_init (&service->srv_list);
2626 cfs_spin_unlock (&ptlrpc_all_services_lock);
2628 ptlrpc_lprocfs_unregister_service(service);
2630 /* All history will be culled when the next request buffer is
2632 service->srv_max_history_rqbds = 0;
2634 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
2636 rc = LNetClearLazyPortal(service->srv_req_portal);
2639 /* Unlink all the request buffers. This forces a 'final' event with
2640 * its 'unlink' flag set for each posted rqbd */
2641 cfs_list_for_each(tmp, &service->srv_active_rqbds) {
2642 struct ptlrpc_request_buffer_desc *rqbd =
2643 cfs_list_entry(tmp, struct ptlrpc_request_buffer_desc,
2646 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2647 LASSERT (rc == 0 || rc == -ENOENT);
2650 /* Wait for the network to release any buffers it's currently
2653 cfs_spin_lock(&service->srv_lock);
2654 rc = service->srv_nrqbd_receiving;
2655 cfs_spin_unlock(&service->srv_lock);
2660 /* Network access will complete in finite time but the HUGE
2661 * timeout lets us CWARN for visibility of sluggish NALs */
2662 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
2663 cfs_time_seconds(1), NULL, NULL);
2664 rc = l_wait_event(service->srv_waitq,
2665 service->srv_nrqbd_receiving == 0,
2667 if (rc == -ETIMEDOUT)
2668 CWARN("Service %s waiting for request buffers\n",
2672 /* schedule all outstanding replies to terminate them */
2673 cfs_spin_lock(&service->srv_rs_lock);
2674 while (!cfs_list_empty(&service->srv_active_replies)) {
2675 struct ptlrpc_reply_state *rs =
2676 cfs_list_entry(service->srv_active_replies.next,
2677 struct ptlrpc_reply_state, rs_list);
2678 cfs_spin_lock(&rs->rs_lock);
2679 ptlrpc_schedule_difficult_reply(rs);
2680 cfs_spin_unlock(&rs->rs_lock);
2682 cfs_spin_unlock(&service->srv_rs_lock);
2684 /* purge the request queue. NB No new replies (rqbds all unlinked)
2685 * and no service threads, so I'm the only thread noodling the
2686 * request queue now */
2687 while (!cfs_list_empty(&service->srv_req_in_queue)) {
2688 struct ptlrpc_request *req =
2689 cfs_list_entry(service->srv_req_in_queue.next,
2690 struct ptlrpc_request,
2693 cfs_list_del(&req->rq_list);
2694 service->srv_n_queued_reqs--;
2695 service->srv_n_active_reqs++;
2696 ptlrpc_server_finish_request(service, req);
2698 while (ptlrpc_server_request_pending(service, 1)) {
2699 struct ptlrpc_request *req;
2701 req = ptlrpc_server_request_get(service, 1);
2702 cfs_list_del(&req->rq_list);
2703 service->srv_n_queued_reqs--;
2704 service->srv_n_active_reqs++;
2705 ptlrpc_hpreq_fini(req);
2706 ptlrpc_server_finish_request(service, req);
2708 LASSERT(service->srv_n_queued_reqs == 0);
2709 LASSERT(service->srv_n_active_reqs == 0);
2710 LASSERT(service->srv_n_history_rqbds == 0);
2711 LASSERT(cfs_list_empty(&service->srv_active_rqbds));
2713 /* Now free all the request buffers since nothing references them
2715 while (!cfs_list_empty(&service->srv_idle_rqbds)) {
2716 struct ptlrpc_request_buffer_desc *rqbd =
2717 cfs_list_entry(service->srv_idle_rqbds.next,
2718 struct ptlrpc_request_buffer_desc,
2721 ptlrpc_free_rqbd(rqbd);
2724 ptlrpc_wait_replies(service);
2726 cfs_list_for_each_entry_safe(rs, t, &service->srv_free_rs_list,
2728 cfs_list_del(&rs->rs_list);
2729 OBD_FREE(rs, service->srv_max_reply_size);
2732 /* In case somebody rearmed this in the meantime */
2733 cfs_timer_disarm(&service->srv_at_timer);
2735 if (array->paa_reqs_array != NULL) {
2736 OBD_FREE(array->paa_reqs_array,
2737 sizeof(cfs_list_t) * array->paa_size);
2738 array->paa_reqs_array = NULL;
2741 if (array->paa_reqs_count != NULL) {
2742 OBD_FREE(array->paa_reqs_count,
2743 sizeof(__u32) * array->paa_size);
2744 array->paa_reqs_count= NULL;
2747 OBD_FREE_PTR(service);
2752 * Returns 0 if the service is healthy.
2754 * Right now, it just checks to make sure that requests aren't languishing
2755 * in the queue. We'll use this health check to govern whether a node needs
2756 * to be shot, so it's intentionally non-aggressive. */
2757 int ptlrpc_service_health_check(struct ptlrpc_service *svc)
2759 struct ptlrpc_request *request;
2760 struct timeval right_now;
2766 cfs_gettimeofday(&right_now);
2768 cfs_spin_lock(&svc->srv_rq_lock);
2769 if (!ptlrpc_server_request_pending(svc, 1)) {
2770 cfs_spin_unlock(&svc->srv_rq_lock);
2774 /* How long has the next entry been waiting? */
2775 if (cfs_list_empty(&svc->srv_request_queue))
2776 request = cfs_list_entry(svc->srv_request_hpq.next,
2777 struct ptlrpc_request, rq_list);
2779 request = cfs_list_entry(svc->srv_request_queue.next,
2780 struct ptlrpc_request, rq_list);
2781 timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
2782 cfs_spin_unlock(&svc->srv_rq_lock);
2784 if ((timediff / ONE_MILLION) > (AT_OFF ? obd_timeout * 3/2 :
2786 CERROR("%s: unhealthy - request has been waiting %lds\n",
2787 svc->srv_name, timediff / ONE_MILLION);