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Merge remote-tracking branch 'staging/staging-next'
[deliverable/linux.git] / drivers / staging / lustre / lustre / ptlrpc / service.c
CommitLineData
d7e09d03
PT		 1/*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
6a5b99a4 18 * http://www.gnu.org/licenses/gpl-2.0.html
d7e09d03 19 *
d7e09d03
PT		 20 * GPL HEADER END
21 */
22/*
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
25 *
1dc563a6 26 * Copyright (c) 2010, 2015, Intel Corporation.
d7e09d03
PT		 27 */
28/*
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
31 */
32
33#define DEBUG_SUBSYSTEM S_RPC
e27db149
GKH		 34#include "../include/obd_support.h"
35#include "../include/obd_class.h"
36#include "../include/lustre_net.h"
37#include "../include/lu_object.h"
9fdaf8c0 38#include "../../include/linux/lnet/types.h"
d7e09d03
PT		 39#include "ptlrpc_internal.h"
40
41/* The following are visible and mutable through /sys/module/ptlrpc */
b963e722 42int test_req_buffer_pressure;
8cc7b4b9
PT		 43module_param(test_req_buffer_pressure, int, 0444);
44MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools");
45module_param(at_min, int, 0644);
46MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)");
47module_param(at_max, int, 0644);
48MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)");
49module_param(at_history, int, 0644);
50MODULE_PARM_DESC(at_history,
51 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
52module_param(at_early_margin, int, 0644);
53MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply");
54module_param(at_extra, int, 0644);
55MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply");
d7e09d03 56
d7e09d03
PT		 57/* forward ref */
58static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
59static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
60static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
61
62/** Holds a list of all PTLRPC services */
63LIST_HEAD(ptlrpc_all_services);
64/** Used to protect the \e ptlrpc_all_services list */
65struct mutex ptlrpc_all_services_mutex;
66
a96389d9 67static struct ptlrpc_request_buffer_desc *
d7e09d03
PT		 68ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt)
69{
d0bfef31 70 struct ptlrpc_service *svc = svcpt->scp_service;
d7e09d03
PT		 71 struct ptlrpc_request_buffer_desc *rqbd;
72
bae97e81
JL		 73 rqbd = kzalloc_node(sizeof(*rqbd), GFP_NOFS,
74 cfs_cpt_spread_node(svc->srv_cptable,
75 svcpt->scp_cpt));
8b382089 76 if (!rqbd)
d7e09d03
PT		 77 return NULL;
78
79 rqbd->rqbd_svcpt = svcpt;
80 rqbd->rqbd_refcount = 0;
81 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
82 rqbd->rqbd_cbid.cbid_arg = rqbd;
83 INIT_LIST_HEAD(&rqbd->rqbd_reqs);
6fd57333
OD		 84 rqbd->rqbd_buffer = libcfs_kvzalloc_cpt(svc->srv_cptable,
85 svcpt->scp_cpt,
86 svc->srv_buf_size,
87 GFP_KERNEL);
8b382089 88 if (!rqbd->rqbd_buffer) {
9ae10597 89 kfree(rqbd);
d7e09d03
PT		 90 return NULL;
91 }
92
93 spin_lock(&svcpt->scp_lock);
94 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
95 svcpt->scp_nrqbds_total++;
96 spin_unlock(&svcpt->scp_lock);
97
98 return rqbd;
99}
100
a96389d9 101static void
d7e09d03
PT		 102ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
103{
104 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
105
106 LASSERT(rqbd->rqbd_refcount == 0);
107 LASSERT(list_empty(&rqbd->rqbd_reqs));
108
109 spin_lock(&svcpt->scp_lock);
110 list_del(&rqbd->rqbd_list);
111 svcpt->scp_nrqbds_total--;
112 spin_unlock(&svcpt->scp_lock);
113
ee0ec194 114 kvfree(rqbd->rqbd_buffer);
9ae10597 115 kfree(rqbd);
d7e09d03
PT		 116}
117
a96389d9 118static int
d7e09d03
PT		 119ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
120{
d0bfef31 121 struct ptlrpc_service *svc = svcpt->scp_service;
d7e09d03 122 struct ptlrpc_request_buffer_desc *rqbd;
d0bfef31
CH		 123 int rc = 0;
124 int i;
d7e09d03
PT		 125
126 if (svcpt->scp_rqbd_allocating)
127 goto try_post;
128
129 spin_lock(&svcpt->scp_lock);
130 /* check again with lock */
131 if (svcpt->scp_rqbd_allocating) {
132 /* NB: we might allow more than one thread in the future */
133 LASSERT(svcpt->scp_rqbd_allocating == 1);
134 spin_unlock(&svcpt->scp_lock);
135 goto try_post;
136 }
137
138 svcpt->scp_rqbd_allocating++;
139 spin_unlock(&svcpt->scp_lock);
140
d7e09d03
PT		 141 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
142 /* NB: another thread might have recycled enough rqbds, we
dadfcdab
OD		 143 * need to make sure it wouldn't over-allocate, see LU-1212.
144 */
d7e09d03
PT		 145 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group)
146 break;
147
148 rqbd = ptlrpc_alloc_rqbd(svcpt);
149
8b382089 150 if (!rqbd) {
d7e09d03
PT		 151 CERROR("%s: Can't allocate request buffer\n",
152 svc->srv_name);
153 rc = -ENOMEM;
154 break;
155 }
156 }
157
158 spin_lock(&svcpt->scp_lock);
159
160 LASSERT(svcpt->scp_rqbd_allocating == 1);
161 svcpt->scp_rqbd_allocating--;
162
163 spin_unlock(&svcpt->scp_lock);
164
165 CDEBUG(D_RPCTRACE,
166 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
167 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
168 svcpt->scp_nrqbds_total, rc);
169
170 try_post:
171 if (post && rc == 0)
172 rc = ptlrpc_server_post_idle_rqbds(svcpt);
173
174 return rc;
175}
176
d7e09d03
PT		 177struct ptlrpc_hr_partition;
178
179struct ptlrpc_hr_thread {
180 int hrt_id; /* thread ID */
181 spinlock_t hrt_lock;
182 wait_queue_head_t hrt_waitq;
183 struct list_head hrt_queue; /* RS queue */
184 struct ptlrpc_hr_partition *hrt_partition;
185};
186
187struct ptlrpc_hr_partition {
188 /* # of started threads */
189 atomic_t hrp_nstarted;
190 /* # of stopped threads */
191 atomic_t hrp_nstopped;
192 /* cpu partition id */
193 int hrp_cpt;
194 /* round-robin rotor for choosing thread */
195 int hrp_rotor;
196 /* total number of threads on this partition */
197 int hrp_nthrs;
198 /* threads table */
199 struct ptlrpc_hr_thread *hrp_thrs;
200};
201
202#define HRT_RUNNING 0
203#define HRT_STOPPING 1
204
205struct ptlrpc_hr_service {
206 /* CPU partition table, it's just cfs_cpt_table for now */
207 struct cfs_cpt_table *hr_cpt_table;
208 /** controller sleep waitq */
209 wait_queue_head_t hr_waitq;
210 unsigned int hr_stopping;
211 /** roundrobin rotor for non-affinity service */
212 unsigned int hr_rotor;
213 /* partition data */
214 struct ptlrpc_hr_partition **hr_partitions;
215};
216
d7e09d03
PT		 217/** reply handling service. */
218static struct ptlrpc_hr_service ptlrpc_hr;
219
d7e09d03
PT		 220/**
221 * Choose an hr thread to dispatch requests to.
222 */
223static struct ptlrpc_hr_thread *
224ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
225{
d0bfef31
CH		 226 struct ptlrpc_hr_partition *hrp;
227 unsigned int rotor;
d7e09d03
PT		 228
229 if (svcpt->scp_cpt >= 0 &&
230 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
231 /* directly match partition */
232 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
233
234 } else {
235 rotor = ptlrpc_hr.hr_rotor++;
236 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
237
238 hrp = ptlrpc_hr.hr_partitions[rotor];
239 }
240
241 rotor = hrp->hrp_rotor++;
242 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
243}
244
d7e09d03
PT		 245/**
246 * Put reply state into a queue for processing because we received
247 * ACK from the client
248 */
249void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
250{
251 struct ptlrpc_hr_thread *hrt;
d7e09d03
PT		 252
253 LASSERT(list_empty(&rs->rs_list));
254
255 hrt = ptlrpc_hr_select(rs->rs_svcpt);
256
257 spin_lock(&hrt->hrt_lock);
258 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
259 spin_unlock(&hrt->hrt_lock);
260
261 wake_up(&hrt->hrt_waitq);
d7e09d03
PT		 262}
263
264void
265ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
266{
5e42bc9d
LX		 267 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
268 assert_spin_locked(&rs->rs_lock);
3949015e 269 LASSERT(rs->rs_difficult);
d7e09d03
PT		 270 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
271
272 if (rs->rs_scheduled) { /* being set up or already notified */
d7e09d03
PT		 273 return;
274 }
275
276 rs->rs_scheduled = 1;
277 list_del_init(&rs->rs_list);
278 ptlrpc_dispatch_difficult_reply(rs);
d7e09d03
PT		 279}
280EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
281
d7e09d03
PT		 282static int
283ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
284{
285 struct ptlrpc_request_buffer_desc *rqbd;
d0bfef31
CH		 286 int rc;
287 int posted = 0;
d7e09d03
PT		 288
289 for (;;) {
290 spin_lock(&svcpt->scp_lock);
291
292 if (list_empty(&svcpt->scp_rqbd_idle)) {
293 spin_unlock(&svcpt->scp_lock);
294 return posted;
295 }
296
297 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
30c0aa39
OD		 298 struct ptlrpc_request_buffer_desc,
299 rqbd_list);
d7e09d03
PT		 300 list_del(&rqbd->rqbd_list);
301
302 /* assume we will post successfully */
303 svcpt->scp_nrqbds_posted++;
304 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
305
306 spin_unlock(&svcpt->scp_lock);
307
308 rc = ptlrpc_register_rqbd(rqbd);
309 if (rc != 0)
310 break;
311
312 posted = 1;
313 }
314
315 spin_lock(&svcpt->scp_lock);
316
317 svcpt->scp_nrqbds_posted--;
318 list_del(&rqbd->rqbd_list);
319 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
320
321 /* Don't complain if no request buffers are posted right now; LNET
dadfcdab
OD		 322 * won't drop requests because we set the portal lazy!
323 */
d7e09d03
PT		 324
325 spin_unlock(&svcpt->scp_lock);
326
327 return -1;
328}
329
330static void ptlrpc_at_timer(unsigned long castmeharder)
331{
332 struct ptlrpc_service_part *svcpt;
333
334 svcpt = (struct ptlrpc_service_part *)castmeharder;
335
336 svcpt->scp_at_check = 1;
337 svcpt->scp_at_checktime = cfs_time_current();
338 wake_up(&svcpt->scp_waitq);
339}
340
341static void
342ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
343 struct ptlrpc_service_conf *conf)
344{
d0bfef31
CH		 345 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
346 unsigned init;
347 unsigned total;
348 unsigned nthrs;
349 int weight;
d7e09d03
PT		 350
351 /*
352 * Common code for estimating & validating threads number.
353 * CPT affinity service could have percpt thread-pool instead
354 * of a global thread-pool, which means user might not always
355 * get the threads number they give it in conf::tc_nthrs_user
356 * even they did set. It's because we need to validate threads
357 * number for each CPT to guarantee each pool will have enough
358 * threads to keep the service healthy.
359 */
360 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
361 init = max_t(int, init, tc->tc_nthrs_init);
362
363 /* NB: please see comments in lustre_lnet.h for definition
dadfcdab
OD		 364 * details of these members
365 */
d7e09d03
PT		 366 LASSERT(tc->tc_nthrs_max != 0);
367
368 if (tc->tc_nthrs_user != 0) {
369 /* In case there is a reason to test a service with many
370 * threads, we give a less strict check here, it can
dadfcdab
OD		 371 * be up to 8 * nthrs_max
372 */
d7e09d03
PT		 373 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
374 nthrs = total / svc->srv_ncpts;
d0bfef31 375 init = max(init, nthrs);
d7e09d03
PT		 376 goto out;
377 }
378
379 total = tc->tc_nthrs_max;
380 if (tc->tc_nthrs_base == 0) {
381 /* don't care about base threads number per partition,
dadfcdab
OD		 382 * this is most for non-affinity service
383 */
d7e09d03
PT		 384 nthrs = total / svc->srv_ncpts;
385 goto out;
386 }
387
388 nthrs = tc->tc_nthrs_base;
389 if (svc->srv_ncpts == 1) {
d0bfef31 390 int i;
d7e09d03
PT		 391
392 /* NB: Increase the base number if it's single partition
393 * and total number of cores/HTs is larger or equal to 4.
dadfcdab
OD		 394 * result will always < 2 * nthrs_base
395 */
d7e09d03
PT		 396 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
397 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
398 (tc->tc_nthrs_base >> i) != 0; i++)
399 nthrs += tc->tc_nthrs_base >> i;
400 }
401
402 if (tc->tc_thr_factor != 0) {
d0bfef31 403 int factor = tc->tc_thr_factor;
d7e09d03
PT		 404 const int fade = 4;
405
406 /*
407 * User wants to increase number of threads with for
408 * each CPU core/HT, most likely the factor is larger then
409 * one thread/core because service threads are supposed to
410 * be blocked by lock or wait for IO.
411 */
412 /*
413 * Amdahl's law says that adding processors wouldn't give
414 * a linear increasing of parallelism, so it's nonsense to
415 * have too many threads no matter how many cores/HTs
416 * there are.
417 */
6301647b 418 /* weight is # of HTs */
06931e62 419 if (cpumask_weight(topology_sibling_cpumask(0)) > 1) {
d7e09d03
PT		 420 /* depress thread factor for hyper-thread */
421 factor = factor - (factor >> 1) + (factor >> 3);
422 }
423
424 weight = cfs_cpt_weight(svc->srv_cptable, 0);
425 LASSERT(weight > 0);
426
427 for (; factor > 0 && weight > 0; factor--, weight -= fade)
428 nthrs += min(weight, fade) * factor;
429 }
430
431 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
432 nthrs = max(tc->tc_nthrs_base,
433 tc->tc_nthrs_max / svc->srv_ncpts);
434 }
435 out:
436 nthrs = max(nthrs, tc->tc_nthrs_init);
437 svc->srv_nthrs_cpt_limit = nthrs;
438 svc->srv_nthrs_cpt_init = init;
439
440 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
2d00bd17 441 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) than the given soft limit (%d)\n",
d7e09d03
PT		 442 svc->srv_name, nthrs * svc->srv_ncpts,
443 tc->tc_nthrs_max);
444 }
445}
446
447/**
448 * Initialize percpt data for a service
449 */
450static int
451ptlrpc_service_part_init(struct ptlrpc_service *svc,
452 struct ptlrpc_service_part *svcpt, int cpt)
453{
454 struct ptlrpc_at_array *array;
d0bfef31
CH		 455 int size;
456 int index;
457 int rc;
d7e09d03
PT		 458
459 svcpt->scp_cpt = cpt;
460 INIT_LIST_HEAD(&svcpt->scp_threads);
461
462 /* rqbd and incoming request queue */
463 spin_lock_init(&svcpt->scp_lock);
464 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
465 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
466 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
467 init_waitqueue_head(&svcpt->scp_waitq);
468 /* history request & rqbd list */
469 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
470 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
471
369e5c9a 472 /* active requests and hp requests */
d7e09d03
PT		 473 spin_lock_init(&svcpt->scp_req_lock);
474
475 /* reply states */
476 spin_lock_init(&svcpt->scp_rep_lock);
477 INIT_LIST_HEAD(&svcpt->scp_rep_active);
478 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
479 init_waitqueue_head(&svcpt->scp_rep_waitq);
480 atomic_set(&svcpt->scp_nreps_difficult, 0);
481
482 /* adaptive timeout */
483 spin_lock_init(&svcpt->scp_at_lock);
484 array = &svcpt->scp_at_array;
485
486 size = at_est2timeout(at_max);
d0bfef31
CH		 487 array->paa_size = size;
488 array->paa_count = 0;
d7e09d03
PT		 489 array->paa_deadline = -1;
490
491 /* allocate memory for scp_at_array (ptlrpc_at_array) */
bae97e81
JL		 492 array->paa_reqs_array =
493 kzalloc_node(sizeof(struct list_head) * size, GFP_NOFS,
494 cfs_cpt_spread_node(svc->srv_cptable, cpt));
8b382089 495 if (!array->paa_reqs_array)
d7e09d03
PT		 496 return -ENOMEM;
497
498 for (index = 0; index < size; index++)
499 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
500
bae97e81
JL		 501 array->paa_reqs_count =
502 kzalloc_node(sizeof(__u32) * size, GFP_NOFS,
503 cfs_cpt_spread_node(svc->srv_cptable, cpt));
8b382089 504 if (!array->paa_reqs_count)
207e99c2 505 goto free_reqs_array;
d7e09d03 506
922da0c5
AB		 507 setup_timer(&svcpt->scp_at_timer, ptlrpc_at_timer,
508 (unsigned long)svcpt);
509
d7e09d03 510 /* At SOW, service time should be quick; 10s seems generous. If client
dadfcdab
OD		 511 * timeout is less than this, we'll be sending an early reply.
512 */
d7e09d03
PT		 513 at_init(&svcpt->scp_at_estimate, 10, 0);
514
515 /* assign this before call ptlrpc_grow_req_bufs */
516 svcpt->scp_service = svc;
517 /* Now allocate the request buffers, but don't post them now */
518 rc = ptlrpc_grow_req_bufs(svcpt, 0);
519 /* We shouldn't be under memory pressure at startup, so
dadfcdab
OD		 520 * fail if we can't allocate all our buffers at this time.
521 */
d7e09d03 522 if (rc != 0)
207e99c2 523 goto free_reqs_count;
d7e09d03
PT		 524
525 return 0;
526
207e99c2
JL		 527free_reqs_count:
528 kfree(array->paa_reqs_count);
529 array->paa_reqs_count = NULL;
530free_reqs_array:
531 kfree(array->paa_reqs_array);
532 array->paa_reqs_array = NULL;
d7e09d03
PT		 533
534 return -ENOMEM;
535}
536
537/**
538 * Initialize service on a given portal.
539 * This includes starting serving threads , allocating and posting rqbds and
540 * so on.
541 */
542struct ptlrpc_service *
543ptlrpc_register_service(struct ptlrpc_service_conf *conf,
328676f8 544 struct kset *parent,
700815d4 545 struct dentry *debugfs_entry)
d7e09d03 546{
d0bfef31
CH		 547 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
548 struct ptlrpc_service *service;
549 struct ptlrpc_service_part *svcpt;
550 struct cfs_cpt_table *cptable;
551 __u32 *cpts = NULL;
552 int ncpts;
553 int cpt;
554 int rc;
555 int i;
d7e09d03
PT		 556
557 LASSERT(conf->psc_buf.bc_nbufs > 0);
558 LASSERT(conf->psc_buf.bc_buf_size >=
559 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
560 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
561
562 cptable = cconf->cc_cptable;
8b382089 563 if (!cptable)
d7e09d03
PT		 564 cptable = cfs_cpt_table;
565
566 if (!conf->psc_thr.tc_cpu_affinity) {
567 ncpts = 1;
568 } else {
569 ncpts = cfs_cpt_number(cptable);
8b382089 570 if (cconf->cc_pattern) {
d0bfef31 571 struct cfs_expr_list *el;
d7e09d03
PT		 572
573 rc = cfs_expr_list_parse(cconf->cc_pattern,
574 strlen(cconf->cc_pattern),
575 0, ncpts - 1, &el);
576 if (rc != 0) {
577 CERROR("%s: invalid CPT pattern string: %s",
578 conf->psc_name, cconf->cc_pattern);
0a3bdb00 579 return ERR_PTR(-EINVAL);
d7e09d03
PT		 580 }
581
582 rc = cfs_expr_list_values(el, ncpts, &cpts);
583 cfs_expr_list_free(el);
584 if (rc <= 0) {
585 CERROR("%s: failed to parse CPT array %s: %d\n",
586 conf->psc_name, cconf->cc_pattern, rc);
207e99c2 587 kfree(cpts);
0a3bdb00 588 return ERR_PTR(rc < 0 ? rc : -EINVAL);
d7e09d03
PT		 589 }
590 ncpts = rc;
591 }
592 }
593
9ae10597
JL		 594 service = kzalloc(offsetof(struct ptlrpc_service, srv_parts[ncpts]),
595 GFP_NOFS);
597851ac 596 if (!service) {
207e99c2 597 kfree(cpts);
0a3bdb00 598 return ERR_PTR(-ENOMEM);
d7e09d03
PT		 599 }
600
d0bfef31
CH		 601 service->srv_cptable = cptable;
602 service->srv_cpts = cpts;
603 service->srv_ncpts = ncpts;
d7e09d03
PT		 604
605 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
606 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
607 service->srv_cpt_bits++;
608
609 /* public members */
610 spin_lock_init(&service->srv_lock);
d0bfef31
CH		 611 service->srv_name = conf->psc_name;
612 service->srv_watchdog_factor = conf->psc_watchdog_factor;
b6da17f3 613 INIT_LIST_HEAD(&service->srv_list); /* for safety of cleanup */
d7e09d03
PT		 614
615 /* buffer configuration */
d0bfef31 616 service->srv_nbuf_per_group = test_req_buffer_pressure ?
d7e09d03 617 1 : conf->psc_buf.bc_nbufs;
d0bfef31 618 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
d7e09d03 619 SPTLRPC_MAX_PAYLOAD;
d0bfef31
CH		 620 service->srv_buf_size = conf->psc_buf.bc_buf_size;
621 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
622 service->srv_req_portal = conf->psc_buf.bc_req_portal;
d7e09d03
PT		 623
624 /* Increase max reply size to next power of two */
625 service->srv_max_reply_size = 1;
626 while (service->srv_max_reply_size <
627 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
628 service->srv_max_reply_size <<= 1;
629
d0bfef31
CH		 630 service->srv_thread_name = conf->psc_thr.tc_thr_name;
631 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
632 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
633 service->srv_ops = conf->psc_ops;
d7e09d03
PT		 634
635 for (i = 0; i < ncpts; i++) {
636 if (!conf->psc_thr.tc_cpu_affinity)
637 cpt = CFS_CPT_ANY;
638 else
8b382089 639 cpt = cpts ? cpts[i] : i;
d7e09d03 640
bae97e81
JL		 641 svcpt = kzalloc_node(sizeof(*svcpt), GFP_NOFS,
642 cfs_cpt_spread_node(cptable, cpt));
8b382089 643 if (!svcpt) {
a9b3e8f3
JL		 644 rc = -ENOMEM;
645 goto failed;
646 }
d7e09d03
PT		 647
648 service->srv_parts[i] = svcpt;
649 rc = ptlrpc_service_part_init(service, svcpt, cpt);
650 if (rc != 0)
a9b3e8f3 651 goto failed;
d7e09d03
PT		 652 }
653
654 ptlrpc_server_nthreads_check(service, conf);
655
656 rc = LNetSetLazyPortal(service->srv_req_portal);
657 LASSERT(rc == 0);
658
659 mutex_lock(&ptlrpc_all_services_mutex);
3949015e 660 list_add(&service->srv_list, &ptlrpc_all_services);
d7e09d03
PT		 661 mutex_unlock(&ptlrpc_all_services_mutex);
662
328676f8
OD		 663 if (parent) {
664 rc = ptlrpc_sysfs_register_service(parent, service);
665 if (rc)
666 goto failed;
667 }
668
700815d4
DE		 669 if (!IS_ERR_OR_NULL(debugfs_entry))
670 ptlrpc_ldebugfs_register_service(debugfs_entry, service);
d7e09d03
PT		 671
672 rc = ptlrpc_service_nrs_setup(service);
673 if (rc != 0)
a9b3e8f3 674 goto failed;
d7e09d03
PT		 675
676 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
677 service->srv_name, service->srv_req_portal);
678
679 rc = ptlrpc_start_threads(service);
680 if (rc != 0) {
681 CERROR("Failed to start threads for service %s: %d\n",
682 service->srv_name, rc);
a9b3e8f3 683 goto failed;
d7e09d03
PT		 684 }
685
0a3bdb00 686 return service;
d7e09d03
PT		 687failed:
688 ptlrpc_unregister_service(service);
0a3bdb00 689 return ERR_PTR(rc);
d7e09d03
PT		 690}
691EXPORT_SYMBOL(ptlrpc_register_service);
692
693/**
694 * to actually free the request, must be called without holding svc_lock.
695 * note it's caller's responsibility to unlink req->rq_list.
696 */
697static void ptlrpc_server_free_request(struct ptlrpc_request *req)
698{
699 LASSERT(atomic_read(&req->rq_refcount) == 0);
700 LASSERT(list_empty(&req->rq_timed_list));
701
702 /* DEBUG_REQ() assumes the reply state of a request with a valid
dadfcdab
OD		 703 * ref will not be destroyed until that reference is dropped.
704 */
d7e09d03
PT		 705 ptlrpc_req_drop_rs(req);
706
707 sptlrpc_svc_ctx_decref(req);
708
709 if (req != &req->rq_rqbd->rqbd_req) {
710 /* NB request buffers use an embedded
711 * req if the incoming req unlinked the
dadfcdab
OD		 712 * MD; this isn't one of them!
713 */
35b2e1b7 714 ptlrpc_request_cache_free(req);
d7e09d03
PT		 715 }
716}
717
718/**
719 * drop a reference count of the request. if it reaches 0, we either
720 * put it into history list, or free it immediately.
721 */
230a8da1 722static void ptlrpc_server_drop_request(struct ptlrpc_request *req)
d7e09d03
PT		 723{
724 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
d0bfef31
CH		 725 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
726 struct ptlrpc_service *svc = svcpt->scp_service;
727 int refcount;
728 struct list_head *tmp;
729 struct list_head *nxt;
d7e09d03
PT		 730
731 if (!atomic_dec_and_test(&req->rq_refcount))
732 return;
733
734 if (req->rq_at_linked) {
735 spin_lock(&svcpt->scp_at_lock);
736 /* recheck with lock, in case it's unlinked by
dadfcdab
OD		 737 * ptlrpc_at_check_timed()
738 */
d7e09d03
PT		 739 if (likely(req->rq_at_linked))
740 ptlrpc_at_remove_timed(req);
741 spin_unlock(&svcpt->scp_at_lock);
742 }
743
744 LASSERT(list_empty(&req->rq_timed_list));
745
746 /* finalize request */
747 if (req->rq_export) {
748 class_export_put(req->rq_export);
749 req->rq_export = NULL;
750 }
751
752 spin_lock(&svcpt->scp_lock);
753
754 list_add(&req->rq_list, &rqbd->rqbd_reqs);
755
756 refcount = --(rqbd->rqbd_refcount);
757 if (refcount == 0) {
758 /* request buffer is now idle: add to history */
759 list_del(&rqbd->rqbd_list);
760
761 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
762 svcpt->scp_hist_nrqbds++;
763
764 /* cull some history?
dadfcdab
OD		 765 * I expect only about 1 or 2 rqbds need to be recycled here
766 */
d7e09d03
PT		 767 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
768 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
30c0aa39
OD		 769 struct ptlrpc_request_buffer_desc,
770 rqbd_list);
d7e09d03
PT		 771
772 list_del(&rqbd->rqbd_list);
773 svcpt->scp_hist_nrqbds--;
774
775 /* remove rqbd's reqs from svc's req history while
dadfcdab
OD		 776 * I've got the service lock
777 */
d7e09d03
PT		 778 list_for_each(tmp, &rqbd->rqbd_reqs) {
779 req = list_entry(tmp, struct ptlrpc_request,
30c0aa39 780 rq_list);
d7e09d03
PT		 781 /* Track the highest culled req seq */
782 if (req->rq_history_seq >
783 svcpt->scp_hist_seq_culled) {
784 svcpt->scp_hist_seq_culled =
785 req->rq_history_seq;
786 }
787 list_del(&req->rq_history_list);
788 }
789
790 spin_unlock(&svcpt->scp_lock);
791
792 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
793 req = list_entry(rqbd->rqbd_reqs.next,
30c0aa39
OD		 794 struct ptlrpc_request,
795 rq_list);
d7e09d03
PT		 796 list_del(&req->rq_list);
797 ptlrpc_server_free_request(req);
798 }
799
800 spin_lock(&svcpt->scp_lock);
801 /*
802 * now all reqs including the embedded req has been
803 * disposed, schedule request buffer for re-use.
804 */
805 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) ==
806 0);
30c0aa39 807 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
d7e09d03
PT		 808 }
809
810 spin_unlock(&svcpt->scp_lock);
811 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
812 /* If we are low on memory, we are not interested in history */
813 list_del(&req->rq_list);
814 list_del_init(&req->rq_history_list);
815
816 /* Track the highest culled req seq */
817 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
818 svcpt->scp_hist_seq_culled = req->rq_history_seq;
819
820 spin_unlock(&svcpt->scp_lock);
821
822 ptlrpc_server_free_request(req);
823 } else {
824 spin_unlock(&svcpt->scp_lock);
825 }
826}
827
d7e09d03
PT		 828/**
829 * to finish a request: stop sending more early replies, and release
830 * the request.
831 */
832static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
833 struct ptlrpc_request *req)
834{
835 ptlrpc_server_hpreq_fini(req);
836
70187506
MP		 837 if (req->rq_session.lc_thread) {
838 lu_context_exit(&req->rq_session);
839 lu_context_fini(&req->rq_session);
840 }
841
d7e09d03
PT		 842 ptlrpc_server_drop_request(req);
843}
844
845/**
846 * to finish a active request: stop sending more early replies, and release
847 * the request. should be called after we finished handling the request.
848 */
849static void ptlrpc_server_finish_active_request(
850 struct ptlrpc_service_part *svcpt,
851 struct ptlrpc_request *req)
852{
853 spin_lock(&svcpt->scp_req_lock);
854 ptlrpc_nrs_req_stop_nolock(req);
855 svcpt->scp_nreqs_active--;
856 if (req->rq_hp)
857 svcpt->scp_nhreqs_active--;
858 spin_unlock(&svcpt->scp_req_lock);
859
860 ptlrpc_nrs_req_finalize(req);
861
8b382089 862 if (req->rq_export)
d7e09d03
PT		 863 class_export_rpc_dec(req->rq_export);
864
865 ptlrpc_server_finish_request(svcpt, req);
866}
867
d7e09d03
PT		 868/**
869 * Sanity check request \a req.
870 * Return 0 if all is ok, error code otherwise.
871 */
872static int ptlrpc_check_req(struct ptlrpc_request *req)
873{
f60d7c39 874 struct obd_device *obd = req->rq_export->exp_obd;
d7e09d03
PT		 875 int rc = 0;
876
877 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
878 req->rq_export->exp_conn_cnt)) {
879 DEBUG_REQ(D_RPCTRACE, req,
880 "DROPPING req from old connection %d < %d",
881 lustre_msg_get_conn_cnt(req->rq_reqmsg),
882 req->rq_export->exp_conn_cnt);
883 return -EEXIST;
884 }
8b382089 885 if (unlikely(!obd || obd->obd_fail)) {
532118c0
KM		 886 /*
887 * Failing over, don't handle any more reqs, send
888 * error response instead.
889 */
d7e09d03 890 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
8b382089 891 req, obd ? obd->obd_name : "unknown");
d7e09d03
PT		 892 rc = -ENODEV;
893 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
af3ec53b
OD		 894 (MSG_REPLAY | MSG_REQ_REPLAY_DONE)) {
895 DEBUG_REQ(D_ERROR, req, "Invalid replay without recovery");
896 class_fail_export(req->rq_export);
897 rc = -ENODEV;
898 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0) {
899 DEBUG_REQ(D_ERROR, req,
900 "Invalid req with transno %llu without recovery",
901 lustre_msg_get_transno(req->rq_reqmsg));
902 class_fail_export(req->rq_export);
903 rc = -ENODEV;
d7e09d03
PT		 904 }
905
906 if (unlikely(rc < 0)) {
907 req->rq_status = rc;
908 ptlrpc_error(req);
909 }
910 return rc;
911}
912
913static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
914{
915 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
916 __s32 next;
917
918 if (array->paa_count == 0) {
922da0c5 919 del_timer(&svcpt->scp_at_timer);
d7e09d03
PT		 920 return;
921 }
922
923 /* Set timer for closest deadline */
219e6de6 924 next = (__s32)(array->paa_deadline - ktime_get_real_seconds() -
d7e09d03
PT		 925 at_early_margin);
926 if (next <= 0) {
927 ptlrpc_at_timer((unsigned long)svcpt);
928 } else {
922da0c5 929 mod_timer(&svcpt->scp_at_timer, cfs_time_shift(next));
d7e09d03
PT		 930 CDEBUG(D_INFO, "armed %s at %+ds\n",
931 svcpt->scp_service->srv_name, next);
932 }
933}
934
935/* Add rpc to early reply check list */
936static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
937{
938 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
939 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
940 struct ptlrpc_request *rq = NULL;
941 __u32 index;
942
943 if (AT_OFF)
fbe7c6c7 944 return 0;
d7e09d03
PT		 945
946 if (req->rq_no_reply)
947 return 0;
948
949 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
fbe7c6c7 950 return -ENOSYS;
d7e09d03
PT		 951
952 spin_lock(&svcpt->scp_at_lock);
953 LASSERT(list_empty(&req->rq_timed_list));
954
219e6de6 955 div_u64_rem(req->rq_deadline, array->paa_size, &index);
d7e09d03
PT		 956 if (array->paa_reqs_count[index] > 0) {
957 /* latest rpcs will have the latest deadlines in the list,
dadfcdab
OD		 958 * so search backward.
959 */
30c0aa39
OD		 960 list_for_each_entry_reverse(rq, &array->paa_reqs_array[index],
961 rq_timed_list) {
d7e09d03
PT		 962 if (req->rq_deadline >= rq->rq_deadline) {
963 list_add(&req->rq_timed_list,
30c0aa39 964 &rq->rq_timed_list);
d7e09d03
PT		 965 break;
966 }
967 }
968 }
969
970 /* Add the request at the head of the list */
971 if (list_empty(&req->rq_timed_list))
30c0aa39 972 list_add(&req->rq_timed_list, &array->paa_reqs_array[index]);
d7e09d03
PT		 973
974 spin_lock(&req->rq_lock);
975 req->rq_at_linked = 1;
976 spin_unlock(&req->rq_lock);
977 req->rq_at_index = index;
978 array->paa_reqs_count[index]++;
979 array->paa_count++;
980 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
981 array->paa_deadline = req->rq_deadline;
982 ptlrpc_at_set_timer(svcpt);
983 }
984 spin_unlock(&svcpt->scp_at_lock);
985
986 return 0;
987}
988
989static void
990ptlrpc_at_remove_timed(struct ptlrpc_request *req)
991{
992 struct ptlrpc_at_array *array;
993
994 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
995
996 /* NB: must call with hold svcpt::scp_at_lock */
997 LASSERT(!list_empty(&req->rq_timed_list));
998 list_del_init(&req->rq_timed_list);
999
1000 spin_lock(&req->rq_lock);
1001 req->rq_at_linked = 0;
1002 spin_unlock(&req->rq_lock);
1003
1004 array->paa_reqs_count[req->rq_at_index]--;
1005 array->paa_count--;
1006}
1007
31c5e95e
CH		 1008/*
1009 * Attempt to extend the request deadline by sending an early reply to the
1010 * client.
1011 */
d7e09d03
PT		 1012static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1013{
1014 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1015 struct ptlrpc_request *reqcopy;
1016 struct lustre_msg *reqmsg;
219e6de6 1017 long olddl = req->rq_deadline - ktime_get_real_seconds();
d7e09d03 1018 int rc;
d7e09d03
PT		 1019
1020 /* deadline is when the client expects us to reply, margin is the
dadfcdab
OD		 1021 * difference between clients' and servers' expectations
1022 */
d7e09d03 1023 DEBUG_REQ(D_ADAPTTO, req,
2d00bd17
JP		 1024 "%ssending early reply (deadline %+lds, margin %+lds) for %d+%d",
1025 AT_OFF ? "AT off - not " : "",
d7e09d03
PT		 1026 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1027 at_get(&svcpt->scp_at_estimate), at_extra);
1028
1029 if (AT_OFF)
0a3bdb00 1030 return 0;
d7e09d03
PT		 1031
1032 if (olddl < 0) {
2d00bd17
JP		 1033 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), not sending early reply. Consider increasing at_early_margin (%d)?",
1034 olddl, at_early_margin);
d7e09d03
PT		 1035
1036 /* Return an error so we're not re-added to the timed list. */
0a3bdb00 1037 return -ETIMEDOUT;
d7e09d03
PT		 1038 }
1039
cb68dd2d 1040 if (!(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
2d00bd17 1041 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, but no AT support");
0a3bdb00 1042 return -ENOSYS;
d7e09d03
PT		 1043 }
1044
31c5e95e
CH		 1045 /*
1046 * We want to extend the request deadline by at_extra seconds,
1047 * so we set our service estimate to reflect how much time has
1048 * passed since this request arrived plus an additional
1049 * at_extra seconds. The client will calculate the new deadline
1050 * based on this service estimate (plus some additional time to
1051 * account for network latency). See ptlrpc_at_recv_early_reply
dadfcdab 1052 */
af3ec53b
OD		 1053 at_measured(&svcpt->scp_at_estimate, at_extra +
1054 ktime_get_real_seconds() - req->rq_arrival_time.tv_sec);
1055
1056 /* Check to see if we've actually increased the deadline -
dadfcdab
OD		 1057 * we may be past adaptive_max
1058 */
af3ec53b
OD		 1059 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1060 at_get(&svcpt->scp_at_estimate)) {
1061 DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%lld), not sending early reply\n",
1062 olddl, req->rq_arrival_time.tv_sec +
1063 at_get(&svcpt->scp_at_estimate) -
1064 ktime_get_real_seconds());
1065 return -ETIMEDOUT;
d7e09d03 1066 }
d7e09d03 1067
0be19afa 1068 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
8b382089 1069 if (!reqcopy)
0a3bdb00 1070 return -ENOMEM;
ee0ec194 1071 reqmsg = libcfs_kvzalloc(req->rq_reqlen, GFP_NOFS);
a9b3e8f3
JL		 1072 if (!reqmsg) {
1073 rc = -ENOMEM;
1074 goto out_free;
1075 }
d7e09d03
PT		 1076
1077 *reqcopy = *req;
1078 reqcopy->rq_reply_state = NULL;
1079 reqcopy->rq_rep_swab_mask = 0;
1080 reqcopy->rq_pack_bulk = 0;
1081 reqcopy->rq_pack_udesc = 0;
1082 reqcopy->rq_packed_final = 0;
1083 sptlrpc_svc_ctx_addref(reqcopy);
1084 /* We only need the reqmsg for the magic */
1085 reqcopy->rq_reqmsg = reqmsg;
1086 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1087
1088 LASSERT(atomic_read(&req->rq_refcount));
1089 /** if it is last refcount then early reply isn't needed */
1090 if (atomic_read(&req->rq_refcount) == 1) {
2d00bd17 1091 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, abort sending early reply\n");
a9b3e8f3
JL		 1092 rc = -EINVAL;
1093 goto out;
d7e09d03
PT		 1094 }
1095
1096 /* Connection ref */
1097 reqcopy->rq_export = class_conn2export(
1098 lustre_msg_get_handle(reqcopy->rq_reqmsg));
8b382089 1099 if (!reqcopy->rq_export) {
a9b3e8f3
JL		 1100 rc = -ENODEV;
1101 goto out;
1102 }
d7e09d03
PT		 1103
1104 /* RPC ref */
1105 class_export_rpc_inc(reqcopy->rq_export);
1106 if (reqcopy->rq_export->exp_obd &&
a9b3e8f3
JL		 1107 reqcopy->rq_export->exp_obd->obd_fail) {
1108 rc = -ENODEV;
1109 goto out_put;
1110 }
d7e09d03
PT		 1111
1112 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1113 if (rc)
a9b3e8f3 1114 goto out_put;
d7e09d03
PT		 1115
1116 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1117
1118 if (!rc) {
1119 /* Adjust our own deadline to what we told the client */
31c5e95e
CH		 1120 req->rq_deadline = req->rq_arrival_time.tv_sec +
1121 at_get(&svcpt->scp_at_estimate);
d7e09d03
PT		 1122 req->rq_early_count++; /* number sent, server side */
1123 } else {
1124 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1125 }
1126
1127 /* Free the (early) reply state from lustre_pack_reply.
dadfcdab
OD		 1128 * (ptlrpc_send_reply takes it's own rs ref, so this is safe here)
1129 */
d7e09d03
PT		 1130 ptlrpc_req_drop_rs(reqcopy);
1131
1132out_put:
1133 class_export_rpc_dec(reqcopy->rq_export);
1134 class_export_put(reqcopy->rq_export);
1135out:
1136 sptlrpc_svc_ctx_decref(reqcopy);
ee0ec194 1137 kvfree(reqmsg);
35b2e1b7
AS		 1138out_free:
1139 ptlrpc_request_cache_free(reqcopy);
0a3bdb00 1140 return rc;
d7e09d03
PT		 1141}
1142
1143/* Send early replies to everybody expiring within at_early_margin
dadfcdab
OD		 1144 * asking for at_extra time
1145 */
80b6f295 1146static void ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
d7e09d03
PT		 1147{
1148 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1149 struct ptlrpc_request *rq, *n;
1150 struct list_head work_list;
d0bfef31 1151 __u32 index, count;
219e6de6
AB		 1152 time64_t deadline;
1153 time64_t now = ktime_get_real_seconds();
b2d201bd 1154 long delay;
d7e09d03 1155 int first, counter = 0;
d7e09d03
PT		 1156
1157 spin_lock(&svcpt->scp_at_lock);
1158 if (svcpt->scp_at_check == 0) {
1159 spin_unlock(&svcpt->scp_at_lock);
80b6f295 1160 return;
d7e09d03
PT		 1161 }
1162 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1163 svcpt->scp_at_check = 0;
1164
1165 if (array->paa_count == 0) {
1166 spin_unlock(&svcpt->scp_at_lock);
80b6f295 1167 return;
d7e09d03
PT		 1168 }
1169
1170 /* The timer went off, but maybe the nearest rpc already completed. */
1171 first = array->paa_deadline - now;
1172 if (first > at_early_margin) {
1173 /* We've still got plenty of time. Reset the timer. */
1174 ptlrpc_at_set_timer(svcpt);
1175 spin_unlock(&svcpt->scp_at_lock);
80b6f295 1176 return;
d7e09d03
PT		 1177 }
1178
1179 /* We're close to a timeout, and we don't know how much longer the
dadfcdab
OD		 1180 * server will take. Send early replies to everyone expiring soon.
1181 */
d7e09d03
PT		 1182 INIT_LIST_HEAD(&work_list);
1183 deadline = -1;
219e6de6 1184 div_u64_rem(array->paa_deadline, array->paa_size, &index);
d7e09d03
PT		 1185 count = array->paa_count;
1186 while (count > 0) {
1187 count -= array->paa_reqs_count[index];
30c0aa39
OD		 1188 list_for_each_entry_safe(rq, n, &array->paa_reqs_array[index],
1189 rq_timed_list) {
d7e09d03
PT		 1190 if (rq->rq_deadline > now + at_early_margin) {
1191 /* update the earliest deadline */
1192 if (deadline == -1 ||
1193 rq->rq_deadline < deadline)
1194 deadline = rq->rq_deadline;
1195 break;
1196 }
1197
1198 ptlrpc_at_remove_timed(rq);
1199 /**
1200 * ptlrpc_server_drop_request() may drop
1201 * refcount to 0 already. Let's check this and
1202 * don't add entry to work_list
1203 */
1204 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1205 list_add(&rq->rq_timed_list, &work_list);
1206 counter++;
1207 }
1208
1209 if (++index >= array->paa_size)
1210 index = 0;
1211 }
1212 array->paa_deadline = deadline;
1213 /* we have a new earliest deadline, restart the timer */
1214 ptlrpc_at_set_timer(svcpt);
1215
1216 spin_unlock(&svcpt->scp_at_lock);
1217
2d00bd17
JP		 1218 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early replies\n",
1219 first, at_extra, counter);
d7e09d03
PT		 1220 if (first < 0) {
1221 /* We're already past request deadlines before we even get a
dadfcdab
OD		 1222 * chance to send early replies
1223 */
2d00bd17 1224 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
d7e09d03 1225 svcpt->scp_service->srv_name);
219e6de6 1226 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n",
d7e09d03
PT		 1227 counter, svcpt->scp_nreqs_incoming,
1228 svcpt->scp_nreqs_active,
1229 at_get(&svcpt->scp_at_estimate), delay);
1230 }
1231
1232 /* we took additional refcount so entries can't be deleted from list, no
dadfcdab
OD		 1233 * locking is needed
1234 */
d7e09d03
PT		 1235 while (!list_empty(&work_list)) {
1236 rq = list_entry(work_list.next, struct ptlrpc_request,
30c0aa39 1237 rq_timed_list);
d7e09d03
PT		 1238 list_del_init(&rq->rq_timed_list);
1239
1240 if (ptlrpc_at_send_early_reply(rq) == 0)
1241 ptlrpc_at_add_timed(rq);
1242
1243 ptlrpc_server_drop_request(rq);
1244 }
d7e09d03
PT		 1245}
1246
1247/**
1248 * Put the request to the export list if the request may become
1249 * a high priority one.
1250 */
1251static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1252 struct ptlrpc_request *req)
1253{
1254 int rc = 0;
d7e09d03
PT		 1255
1256 if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
1257 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1258 if (rc < 0)
0a3bdb00 1259 return rc;
d7e09d03
PT		 1260 LASSERT(rc == 0);
1261 }
1262 if (req->rq_export && req->rq_ops) {
1263 /* Perform request specific check. We should do this check
1264 * before the request is added into exp_hp_rpcs list otherwise
dadfcdab
OD		 1265 * it may hit swab race at LU-1044.
1266 */
d7e09d03
PT		 1267 if (req->rq_ops->hpreq_check) {
1268 rc = req->rq_ops->hpreq_check(req);
1269 /**
1270 * XXX: Out of all current
1271 * ptlrpc_hpreq_ops::hpreq_check(), only
1272 * ldlm_cancel_hpreq_check() can return an error code;
1273 * other functions assert in similar places, which seems
1274 * odd. What also does not seem right is that handlers
1275 * for those RPCs do not assert on the same checks, but
1276 * rather handle the error cases. e.g. see
1277 * ost_rw_hpreq_check(), and ost_brw_read(),
1278 * ost_brw_write().
1279 */
1280 if (rc < 0)
0a3bdb00 1281 return rc;
d7e09d03
PT		 1282 LASSERT(rc == 0 || rc == 1);
1283 }
1284
1285 spin_lock_bh(&req->rq_export->exp_rpc_lock);
30c0aa39 1286 list_add(&req->rq_exp_list, &req->rq_export->exp_hp_rpcs);
d7e09d03
PT		 1287 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1288 }
1289
1290 ptlrpc_nrs_req_initialize(svcpt, req, rc);
1291
0a3bdb00 1292 return rc;
d7e09d03
PT		 1293}
1294
1295/** Remove the request from the export list. */
1296static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1297{
d7e09d03
PT		 1298 if (req->rq_export && req->rq_ops) {
1299 /* refresh lock timeout again so that client has more
dadfcdab
OD		 1300 * room to send lock cancel RPC.
1301 */
d7e09d03
PT		 1302 if (req->rq_ops->hpreq_fini)
1303 req->rq_ops->hpreq_fini(req);
1304
1305 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1306 list_del_init(&req->rq_exp_list);
1307 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1308 }
d7e09d03
PT		 1309}
1310
d7e09d03
PT		 1311static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1312 struct ptlrpc_request *req)
1313{
1314 int rc;
d7e09d03
PT		 1315
1316 rc = ptlrpc_server_hpreq_init(svcpt, req);
1317 if (rc < 0)
0a3bdb00 1318 return rc;
d7e09d03
PT		 1319
1320 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1321
0a3bdb00 1322 return 0;
d7e09d03
PT		 1323}
1324
1325/**
1326 * Allow to handle high priority request
1327 * User can call it w/o any lock but need to hold
1328 * ptlrpc_service_part::scp_req_lock to get reliable result
1329 */
1330static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1331 bool force)
1332{
1333 int running = svcpt->scp_nthrs_running;
1334
1335 if (!nrs_svcpt_has_hp(svcpt))
1336 return false;
1337
1338 if (force)
1339 return true;
1340
1341 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1342 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1343 /* leave just 1 thread for normal RPCs */
1344 running = PTLRPC_NTHRS_INIT;
8b382089 1345 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
d7e09d03
PT		 1346 running += 1;
1347 }
1348
1349 if (svcpt->scp_nreqs_active >= running - 1)
1350 return false;
1351
1352 if (svcpt->scp_nhreqs_active == 0)
1353 return true;
1354
1355 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1356 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1357}
1358
1359static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1360 bool force)
1361{
1362 return ptlrpc_server_allow_high(svcpt, force) &&
1363 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1364}
1365
1366/**
1367 * Only allow normal priority requests on a service that has a high-priority
1368 * queue if forced (i.e. cleanup), if there are other high priority requests
1369 * already being processed (i.e. those threads can service more high-priority
1370 * requests), or if there are enough idle threads that a later thread can do
1371 * a high priority request.
1372 * User can call it w/o any lock but need to hold
1373 * ptlrpc_service_part::scp_req_lock to get reliable result
1374 */
1375static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1376 bool force)
1377{
1378 int running = svcpt->scp_nthrs_running;
50ffcb7e 1379
d7e09d03
PT		 1380 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1381 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1382 /* leave just 1 thread for normal RPCs */
1383 running = PTLRPC_NTHRS_INIT;
8b382089 1384 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
d7e09d03
PT		 1385 running += 1;
1386 }
1387
1388 if (force ||
1389 svcpt->scp_nreqs_active < running - 2)
1390 return true;
1391
1392 if (svcpt->scp_nreqs_active >= running - 1)
1393 return false;
1394
1395 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1396}
1397
1398static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1399 bool force)
1400{
1401 return ptlrpc_server_allow_normal(svcpt, force) &&
1402 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1403}
1404
1405/**
1406 * Returns true if there are requests available in incoming
1407 * request queue for processing and it is allowed to fetch them.
1408 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1409 * to get reliable result
1410 * \see ptlrpc_server_allow_normal
1411 * \see ptlrpc_server_allow high
1412 */
1413static inline bool
1414ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1415{
1416 return ptlrpc_server_high_pending(svcpt, force) ||
1417 ptlrpc_server_normal_pending(svcpt, force);
1418}
1419
1420/**
1421 * Fetch a request for processing from queue of unprocessed requests.
1422 * Favors high-priority requests.
1423 * Returns a pointer to fetched request.
1424 */
1425static struct ptlrpc_request *
1426ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1427{
1428 struct ptlrpc_request *req = NULL;
d7e09d03
PT		 1429
1430 spin_lock(&svcpt->scp_req_lock);
1431
1432 if (ptlrpc_server_high_pending(svcpt, force)) {
1433 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
8b382089 1434 if (req) {
d7e09d03
PT		 1435 svcpt->scp_hreq_count++;
1436 goto got_request;
1437 }
1438 }
1439
1440 if (ptlrpc_server_normal_pending(svcpt, force)) {
1441 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
8b382089 1442 if (req) {
d7e09d03
PT		 1443 svcpt->scp_hreq_count = 0;
1444 goto got_request;
1445 }
1446 }
1447
1448 spin_unlock(&svcpt->scp_req_lock);
0a3bdb00 1449 return NULL;
d7e09d03
PT		 1450
1451got_request:
1452 svcpt->scp_nreqs_active++;
1453 if (req->rq_hp)
1454 svcpt->scp_nhreqs_active++;
1455
1456 spin_unlock(&svcpt->scp_req_lock);
1457
1458 if (likely(req->rq_export))
1459 class_export_rpc_inc(req->rq_export);
1460
0a3bdb00 1461 return req;
d7e09d03
PT		 1462}
1463
1464/**
1465 * Handle freshly incoming reqs, add to timed early reply list,
1466 * pass on to regular request queue.
1467 * All incoming requests pass through here before getting into
1468 * ptlrpc_server_handle_req later on.
1469 */
1470static int
1471ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1472 struct ptlrpc_thread *thread)
1473{
d0bfef31
CH		 1474 struct ptlrpc_service *svc = svcpt->scp_service;
1475 struct ptlrpc_request *req;
1476 __u32 deadline;
1477 int rc;
d7e09d03
PT		 1478
1479 spin_lock(&svcpt->scp_lock);
1480 if (list_empty(&svcpt->scp_req_incoming)) {
1481 spin_unlock(&svcpt->scp_lock);
0a3bdb00 1482 return 0;
d7e09d03
PT		 1483 }
1484
1485 req = list_entry(svcpt->scp_req_incoming.next,
30c0aa39 1486 struct ptlrpc_request, rq_list);
d7e09d03
PT		 1487 list_del_init(&req->rq_list);
1488 svcpt->scp_nreqs_incoming--;
1489 /* Consider this still a "queued" request as far as stats are
dadfcdab
OD		 1490 * concerned
1491 */
d7e09d03
PT		 1492 spin_unlock(&svcpt->scp_lock);
1493
1494 /* go through security check/transform */
1495 rc = sptlrpc_svc_unwrap_request(req);
1496 switch (rc) {
1497 case SECSVC_OK:
1498 break;
1499 case SECSVC_COMPLETE:
1500 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1501 goto err_req;
1502 case SECSVC_DROP:
1503 goto err_req;
1504 default:
1505 LBUG();
1506 }
1507
1508 /*
1509 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1510 * redo it wouldn't be harmful.
1511 */
1512 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1513 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1514 if (rc != 0) {
b0f5aad5
GKH		 1515 CERROR("error unpacking request: ptl %d from %s x%llu\n",
1516 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1517 req->rq_xid);
d7e09d03
PT		 1518 goto err_req;
1519 }
1520 }
1521
1522 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1523 if (rc) {
b0f5aad5
GKH		 1524 CERROR("error unpacking ptlrpc body: ptl %d from %s x%llu\n",
1525 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1526 req->rq_xid);
d7e09d03
PT		 1527 goto err_req;
1528 }
1529
1530 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1531 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
b0f5aad5 1532 CERROR("drop incoming rpc opc %u, x%llu\n",
d7e09d03
PT		 1533 cfs_fail_val, req->rq_xid);
1534 goto err_req;
1535 }
1536
1537 rc = -EINVAL;
1538 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1539 CERROR("wrong packet type received (type=%u) from %s\n",
1540 lustre_msg_get_type(req->rq_reqmsg),
1541 libcfs_id2str(req->rq_peer));
1542 goto err_req;
1543 }
1544
3949015e 1545 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
d7e09d03
PT		 1546 case MDS_WRITEPAGE:
1547 case OST_WRITE:
1548 req->rq_bulk_write = 1;
1549 break;
1550 case MDS_READPAGE:
1551 case OST_READ:
1552 case MGS_CONFIG_READ:
1553 req->rq_bulk_read = 1;
1554 break;
1555 }
1556
b0f5aad5 1557 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
d7e09d03
PT		 1558
1559 req->rq_export = class_conn2export(
1560 lustre_msg_get_handle(req->rq_reqmsg));
1561 if (req->rq_export) {
1562 rc = ptlrpc_check_req(req);
1563 if (rc == 0) {
1564 rc = sptlrpc_target_export_check(req->rq_export, req);
1565 if (rc)
2d00bd17 1566 DEBUG_REQ(D_ERROR, req, "DROPPING req with illegal security flavor,");
d7e09d03
PT		 1567 }
1568
1569 if (rc)
1570 goto err_req;
d7e09d03
PT		 1571 }
1572
1573 /* req_in handling should/must be fast */
219e6de6 1574 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
d7e09d03 1575 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
219e6de6
AB		 1576 (long)(ktime_get_real_seconds() -
1577 req->rq_arrival_time.tv_sec));
d7e09d03
PT		 1578
1579 /* Set rpc server deadline and add it to the timed list */
1580 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1581 MSGHDR_AT_SUPPORT) ?
1582 /* The max time the client expects us to take */
1583 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1584 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1585 if (unlikely(deadline == 0)) {
1586 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1587 goto err_req;
1588 }
1589
1590 req->rq_svc_thread = thread;
70187506
MP		 1591 if (thread) {
1592 /* initialize request session, it is needed for request
1593 * processing by target
1594 */
1595 rc = lu_context_init(&req->rq_session,
1596 LCT_SERVER_SESSION | LCT_NOREF);
1597 if (rc) {
1598 CERROR("%s: failure to initialize session: rc = %d\n",
1599 thread->t_name, rc);
1600 goto err_req;
1601 }
1602 req->rq_session.lc_thread = thread;
1603 lu_context_enter(&req->rq_session);
1604 req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1605 }
d7e09d03
PT		 1606
1607 ptlrpc_at_add_timed(req);
1608
1609 /* Move it over to the request processing queue */
1610 rc = ptlrpc_server_request_add(svcpt, req);
1611 if (rc)
a9b3e8f3 1612 goto err_req;
d7e09d03
PT		 1613
1614 wake_up(&svcpt->scp_waitq);
0a3bdb00 1615 return 1;
d7e09d03
PT		 1616
1617err_req:
1618 ptlrpc_server_finish_request(svcpt, req);
1619
0a3bdb00 1620 return 1;
d7e09d03
PT		 1621}
1622
1623/**
1624 * Main incoming request handling logic.
1625 * Calls handler function from service to do actual processing.
1626 */
1627static int
1628ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1629 struct ptlrpc_thread *thread)
1630{
1631 struct ptlrpc_service *svc = svcpt->scp_service;
1632 struct ptlrpc_request *request;
219e6de6
AB		 1633 struct timespec64 work_start;
1634 struct timespec64 work_end;
1635 struct timespec64 timediff;
1636 struct timespec64 arrived;
1637 unsigned long timediff_usecs;
1638 unsigned long arrived_usecs;
d0bfef31 1639 int fail_opc = 0;
d7e09d03
PT		 1640
1641 request = ptlrpc_server_request_get(svcpt, false);
8b382089 1642 if (!request)
0a3bdb00 1643 return 0;
d7e09d03
PT		 1644
1645 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1646 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1647 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1648 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1649
1650 if (unlikely(fail_opc)) {
1651 if (request->rq_export && request->rq_ops)
1652 OBD_FAIL_TIMEOUT(fail_opc, 4);
1653 }
1654
1655 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1656
3949015e 1657 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
d7e09d03
PT		 1658 libcfs_debug_dumplog();
1659
219e6de6
AB		 1660 ktime_get_real_ts64(&work_start);
1661 timediff = timespec64_sub(work_start, request->rq_arrival_time);
1662 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1663 timediff.tv_nsec / NSEC_PER_USEC;
8b382089 1664 if (likely(svc->srv_stats)) {
d7e09d03 1665 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
219e6de6 1666 timediff_usecs);
d7e09d03
PT		 1667 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1668 svcpt->scp_nreqs_incoming);
1669 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1670 svcpt->scp_nreqs_active);
1671 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1672 at_get(&svcpt->scp_at_estimate));
1673 }
1674
d7e09d03
PT		 1675 if (likely(request->rq_export)) {
1676 if (unlikely(ptlrpc_check_req(request)))
1677 goto put_conn;
d7e09d03
PT		 1678 }
1679
1680 /* Discard requests queued for longer than the deadline.
dadfcdab
OD		 1681 * The deadline is increased if we send an early reply.
1682 */
219e6de6 1683 if (ktime_get_real_seconds() > request->rq_deadline) {
2d00bd17 1684 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline " CFS_DURATION_T ":" CFS_DURATION_T "s ago\n",
d7e09d03 1685 libcfs_id2str(request->rq_peer),
219e6de6
AB		 1686 (long)(request->rq_deadline -
1687 request->rq_arrival_time.tv_sec),
1688 (long)(ktime_get_real_seconds() -
1689 request->rq_deadline));
d7e09d03
PT		 1690 goto put_conn;
1691 }
1692
2d00bd17
JP		 1693 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d\n",
1694 current_comm(),
d7e09d03
PT		 1695 (request->rq_export ?
1696 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1697 (request->rq_export ?
1698 atomic_read(&request->rq_export->exp_refcount) : -99),
1699 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1700 libcfs_id2str(request->rq_peer),
1701 lustre_msg_get_opc(request->rq_reqmsg));
1702
1703 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1704 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
1705
70187506
MP		 1706 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
1707
1708 /* re-assign request and sesson thread to the current one */
1709 request->rq_svc_thread = thread;
1710 if (thread) {
1711 LASSERT(request->rq_session.lc_thread);
1712 request->rq_session.lc_thread = thread;
1713 request->rq_session.lc_cookie = 0x55;
1714 thread->t_env->le_ses = &request->rq_session;
1715 }
1716 svc->srv_ops.so_req_handler(request);
d7e09d03
PT		 1717
1718 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1719
1720put_conn:
219e6de6 1721 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
532118c0 1722 DEBUG_REQ(D_WARNING, request,
219e6de6
AB		 1723 "Request took longer than estimated (%lld:%llds); "
1724 "client may timeout.",
1725 (s64)request->rq_deadline -
1726 request->rq_arrival_time.tv_sec,
1727 (s64)ktime_get_real_seconds() - request->rq_deadline);
1728 }
1729
1730 ktime_get_real_ts64(&work_end);
1731 timediff = timespec64_sub(work_end, work_start);
1732 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1733 timediff.tv_nsec / NSEC_PER_USEC;
1734 arrived = timespec64_sub(work_end, request->rq_arrival_time);
1735 arrived_usecs = arrived.tv_sec * USEC_PER_SEC +
1736 arrived.tv_nsec / NSEC_PER_USEC;
2d00bd17
JP		 1737 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d Request processed in %ldus (%ldus total) trans %llu rc %d/%d\n",
1738 current_comm(),
1739 (request->rq_export ?
1740 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1741 (request->rq_export ?
1742 atomic_read(&request->rq_export->exp_refcount) : -99),
1743 lustre_msg_get_status(request->rq_reqmsg),
1744 request->rq_xid,
1745 libcfs_id2str(request->rq_peer),
1746 lustre_msg_get_opc(request->rq_reqmsg),
219e6de6
AB		 1747 timediff_usecs,
1748 arrived_usecs,
2d00bd17
JP		 1749 (request->rq_repmsg ?
1750 lustre_msg_get_transno(request->rq_repmsg) :
1751 request->rq_transno),
1752 request->rq_status,
1753 (request->rq_repmsg ?
1754 lustre_msg_get_status(request->rq_repmsg) : -999));
8b382089 1755 if (likely(svc->srv_stats && request->rq_reqmsg)) {
d7e09d03
PT		 1756 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
1757 int opc = opcode_offset(op);
50ffcb7e 1758
d7e09d03
PT		 1759 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
1760 LASSERT(opc < LUSTRE_MAX_OPCODES);
1761 lprocfs_counter_add(svc->srv_stats,
1762 opc + EXTRA_MAX_OPCODES,
219e6de6 1763 timediff_usecs);
d7e09d03
PT		 1764 }
1765 }
1766 if (unlikely(request->rq_early_count)) {
1767 DEBUG_REQ(D_ADAPTTO, request,
219e6de6 1768 "sent %d early replies before finishing in %llds",
d7e09d03 1769 request->rq_early_count,
219e6de6
AB		 1770 (s64)work_end.tv_sec -
1771 request->rq_arrival_time.tv_sec);
d7e09d03
PT		 1772 }
1773
d7e09d03
PT		 1774 ptlrpc_server_finish_active_request(svcpt, request);
1775
0a3bdb00 1776 return 1;
d7e09d03
PT		 1777}
1778
1779/**
1780 * An internal function to process a single reply state object.
1781 */
1782static int
1783ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
1784{
1785 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
d0bfef31
CH		 1786 struct ptlrpc_service *svc = svcpt->scp_service;
1787 struct obd_export *exp;
1788 int nlocks;
1789 int been_handled;
d7e09d03
PT		 1790
1791 exp = rs->rs_export;
1792
3949015e
KM		 1793 LASSERT(rs->rs_difficult);
1794 LASSERT(rs->rs_scheduled);
1795 LASSERT(list_empty(&rs->rs_list));
d7e09d03
PT		 1796
1797 spin_lock(&exp->exp_lock);
1798 /* Noop if removed already */
3949015e 1799 list_del_init(&rs->rs_exp_list);
d7e09d03
PT		 1800 spin_unlock(&exp->exp_lock);
1801
1802 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1803 * iterates over newly committed replies, removing them from
1804 * exp_uncommitted_replies. It then drops this lock and schedules the
1805 * replies it found for handling here.
1806 *
1807 * We can avoid contention for exp_uncommitted_replies_lock between the
1808 * HRT threads and further commit callbacks by checking rs_committed
1809 * which is set in the commit callback while it holds both
1810 * rs_lock and exp_uncommitted_reples.
1811 *
1812 * If we see rs_committed clear, the commit callback _may_ not have
1813 * handled this reply yet and we race with it to grab
1814 * exp_uncommitted_replies_lock before removing the reply from
1815 * exp_uncommitted_replies. Note that if we lose the race and the
1816 * reply has already been removed, list_del_init() is a noop.
1817 *
1818 * If we see rs_committed set, we know the commit callback is handling,
1819 * or has handled this reply since store reordering might allow us to
1820 * see rs_committed set out of sequence. But since this is done
1821 * holding rs_lock, we can be sure it has all completed once we hold
1822 * rs_lock, which we do right next.
1823 */
1824 if (!rs->rs_committed) {
1825 spin_lock(&exp->exp_uncommitted_replies_lock);
1826 list_del_init(&rs->rs_obd_list);
1827 spin_unlock(&exp->exp_uncommitted_replies_lock);
1828 }
1829
1830 spin_lock(&rs->rs_lock);
1831
1832 been_handled = rs->rs_handled;
1833 rs->rs_handled = 1;
1834
1835 nlocks = rs->rs_nlocks; /* atomic "steal", but */
1836 rs->rs_nlocks = 0; /* locks still on rs_locks! */
1837
1838 if (nlocks == 0 && !been_handled) {
1839 /* If we see this, we should already have seen the warning
dadfcdab
OD		 1840 * in mds_steal_ack_locks()
1841 */
f537dd2c 1842 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
d7e09d03
PT		 1843 rs,
1844 rs->rs_xid, rs->rs_transno, rs->rs_opc,
1845 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1846 }
1847
1848 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
1849 spin_unlock(&rs->rs_lock);
1850
1851 if (!been_handled && rs->rs_on_net) {
1852 LNetMDUnlink(rs->rs_md_h);
1853 /* Ignore return code; we're racing with completion */
1854 }
1855
1856 while (nlocks-- > 0)
1857 ldlm_lock_decref(&rs->rs_locks[nlocks],
1858 rs->rs_modes[nlocks]);
1859
1860 spin_lock(&rs->rs_lock);
1861 }
1862
1863 rs->rs_scheduled = 0;
1864
1865 if (!rs->rs_on_net) {
1866 /* Off the net */
1867 spin_unlock(&rs->rs_lock);
1868
3949015e 1869 class_export_put(exp);
d7e09d03 1870 rs->rs_export = NULL;
3949015e 1871 ptlrpc_rs_decref(rs);
d7e09d03
PT		 1872 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
1873 svc->srv_is_stopping)
1874 wake_up_all(&svcpt->scp_waitq);
0a3bdb00 1875 return 1;
d7e09d03
PT		 1876 }
1877
1878 /* still on the net; callback will schedule */
1879 spin_unlock(&rs->rs_lock);
0a3bdb00 1880 return 1;
d7e09d03
PT		 1881}
1882
d7e09d03
PT		 1883static void
1884ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
1885{
1886 int avail = svcpt->scp_nrqbds_posted;
1887 int low_water = test_req_buffer_pressure ? 0 :
1888 svcpt->scp_service->srv_nbuf_per_group / 2;
1889
1890 /* NB I'm not locking; just looking. */
1891
1892 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1893 * allowed the request history to grow out of control. We could put a
1894 * sanity check on that here and cull some history if we need the
dadfcdab
OD		 1895 * space.
1896 */
d7e09d03
PT		 1897
1898 if (avail <= low_water)
1899 ptlrpc_grow_req_bufs(svcpt, 1);
1900
1901 if (svcpt->scp_service->srv_stats) {
1902 lprocfs_counter_add(svcpt->scp_service->srv_stats,
1903 PTLRPC_REQBUF_AVAIL_CNTR, avail);
1904 }
1905}
1906
1907static int
1908ptlrpc_retry_rqbds(void *arg)
1909{
864ef621 1910 struct ptlrpc_service_part *svcpt = arg;
d7e09d03
PT		 1911
1912 svcpt->scp_rqbd_timeout = 0;
1913 return -ETIMEDOUT;
1914}
1915
1916static inline int
1917ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
1918{
1919 return svcpt->scp_nreqs_active <
1920 svcpt->scp_nthrs_running - 1 -
1921 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
1922}
1923
1924/**
1925 * allowed to create more threads
1926 * user can call it w/o any lock but need to hold
1927 * ptlrpc_service_part::scp_lock to get reliable result
1928 */
1929static inline int
1930ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
1931{
1932 return svcpt->scp_nthrs_running +
1933 svcpt->scp_nthrs_starting <
1934 svcpt->scp_service->srv_nthrs_cpt_limit;
1935}
1936
1937/**
1938 * too many requests and allowed to create more threads
1939 */
1940static inline int
1941ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
1942{
1943 return !ptlrpc_threads_enough(svcpt) &&
1944 ptlrpc_threads_increasable(svcpt);
1945}
1946
1947static inline int
1948ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
1949{
1950 return thread_is_stopping(thread) ||
1951 thread->t_svcpt->scp_service->srv_is_stopping;
1952}
1953
1954static inline int
1955ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
1956{
1957 return !list_empty(&svcpt->scp_rqbd_idle) &&
1958 svcpt->scp_rqbd_timeout == 0;
1959}
1960
1961static inline int
1962ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
1963{
1964 return svcpt->scp_at_check;
1965}
1966
1967/**
1968 * requests wait on preprocessing
1969 * user can call it w/o any lock but need to hold
1970 * ptlrpc_service_part::scp_lock to get reliable result
1971 */
1972static inline int
1973ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
1974{
1975 return !list_empty(&svcpt->scp_req_incoming);
1976}
1977
1978static __attribute__((__noinline__)) int
1979ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
1980 struct ptlrpc_thread *thread)
1981{
1982 /* Don't exit while there are replies to be handled */
1983 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
1984 ptlrpc_retry_rqbds, svcpt);
1985
5d4450c4 1986 /* XXX: Add this back when libcfs watchdog is merged upstream
d7e09d03 1987 lc_watchdog_disable(thread->t_watchdog);
5d4450c4 1988 */
d7e09d03
PT		 1989
1990 cond_resched();
1991
1992 l_wait_event_exclusive_head(svcpt->scp_waitq,
24c198e9
OD		 1993 ptlrpc_thread_stopping(thread) ||
1994 ptlrpc_server_request_incoming(svcpt) ||
1995 ptlrpc_server_request_pending(svcpt,
1996 false) ||
1997 ptlrpc_rqbd_pending(svcpt) ||
1998 ptlrpc_at_check(svcpt), &lwi);
d7e09d03
PT		 1999
2000 if (ptlrpc_thread_stopping(thread))
2001 return -EINTR;
2002
5d4450c4 2003 /*
d7e09d03
PT		 2004 lc_watchdog_touch(thread->t_watchdog,
2005 ptlrpc_server_get_timeout(svcpt));
5d4450c4 2006 */
d7e09d03
PT		 2007 return 0;
2008}
2009
2010/**
2011 * Main thread body for service threads.
2012 * Waits in a loop waiting for new requests to process to appear.
2013 * Every time an incoming requests is added to its queue, a waitq
2014 * is woken up and one of the threads will handle it.
2015 */
2016static int ptlrpc_main(void *arg)
2017{
864ef621 2018 struct ptlrpc_thread *thread = arg;
d0bfef31
CH		 2019 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2020 struct ptlrpc_service *svc = svcpt->scp_service;
2021 struct ptlrpc_reply_state *rs;
c88a6cbb 2022 struct group_info *ginfo = NULL;
d7e09d03
PT		 2023 struct lu_env *env;
2024 int counter = 0, rc = 0;
d7e09d03
PT		 2025
2026 thread->t_pid = current_pid();
2027 unshare_fs_struct();
2028
2029 /* NB: we will call cfs_cpt_bind() for all threads, because we
2030 * might want to run lustre server only on a subset of system CPUs,
dadfcdab
OD		 2031 * in that case ->scp_cpt is CFS_CPT_ANY
2032 */
d7e09d03
PT		 2033 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2034 if (rc != 0) {
2035 CWARN("%s: failed to bind %s on CPT %d\n",
2036 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2037 }
2038
d7e09d03
PT		 2039 ginfo = groups_alloc(0);
2040 if (!ginfo) {
2041 rc = -ENOMEM;
2042 goto out;
2043 }
2044
2045 set_current_groups(ginfo);
2046 put_group_info(ginfo);
d7e09d03 2047
8b382089 2048 if (svc->srv_ops.so_thr_init) {
d7e09d03
PT		 2049 rc = svc->srv_ops.so_thr_init(thread);
2050 if (rc)
2051 goto out;
2052 }
2053
9ae10597 2054 env = kzalloc(sizeof(*env), GFP_NOFS);
597851ac 2055 if (!env) {
d7e09d03
PT		 2056 rc = -ENOMEM;
2057 goto out_srv_fini;
2058 }
2059
2060 rc = lu_context_init(&env->le_ctx,
cd94f231 2061 svc->srv_ctx_tags | LCT_REMEMBER | LCT_NOREF);
d7e09d03
PT		 2062 if (rc)
2063 goto out_srv_fini;
2064
2065 thread->t_env = env;
2066 env->le_ctx.lc_thread = thread;
2067 env->le_ctx.lc_cookie = 0x6;
2068
2069 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2070 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2071 if (rc >= 0)
2072 continue;
2073
2074 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
30c0aa39 2075 svc->srv_name, svcpt->scp_cpt, rc);
d7e09d03
PT		 2076 goto out_srv_fini;
2077 }
2078
2079 /* Alloc reply state structure for this one */
ee0ec194 2080 rs = libcfs_kvzalloc(svc->srv_max_reply_size, GFP_NOFS);
d7e09d03
PT		 2081 if (!rs) {
2082 rc = -ENOMEM;
2083 goto out_srv_fini;
2084 }
2085
2086 spin_lock(&svcpt->scp_lock);
2087
2088 LASSERT(thread_is_starting(thread));
2089 thread_clear_flags(thread, SVC_STARTING);
2090
2091 LASSERT(svcpt->scp_nthrs_starting == 1);
2092 svcpt->scp_nthrs_starting--;
2093
2094 /* SVC_STOPPING may already be set here if someone else is trying
2095 * to stop the service while this new thread has been dynamically
2096 * forked. We still set SVC_RUNNING to let our creator know that
dadfcdab
OD		 2097 * we are now running, however we will exit as soon as possible
2098 */
d7e09d03
PT		 2099 thread_add_flags(thread, SVC_RUNNING);
2100 svcpt->scp_nthrs_running++;
2101 spin_unlock(&svcpt->scp_lock);
2102
2103 /* wake up our creator in case he's still waiting. */
2104 wake_up(&thread->t_ctl_waitq);
2105
5d4450c4 2106 /*
d7e09d03
PT		 2107 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2108 NULL, NULL);
5d4450c4 2109 */
d7e09d03
PT		 2110
2111 spin_lock(&svcpt->scp_rep_lock);
2112 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2113 wake_up(&svcpt->scp_rep_waitq);
2114 spin_unlock(&svcpt->scp_rep_lock);
2115
2116 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2117 svcpt->scp_nthrs_running);
2118
2119 /* XXX maintain a list of all managed devices: insert here */
2120 while (!ptlrpc_thread_stopping(thread)) {
2121 if (ptlrpc_wait_event(svcpt, thread))
2122 break;
2123
2124 ptlrpc_check_rqbd_pool(svcpt);
2125
2126 if (ptlrpc_threads_need_create(svcpt)) {
2127 /* Ignore return code - we tried... */
2128 ptlrpc_start_thread(svcpt, 0);
2129 }
2130
2131 /* Process all incoming reqs before handling any */
2132 if (ptlrpc_server_request_incoming(svcpt)) {
2133 lu_context_enter(&env->le_ctx);
4ee688d0 2134 env->le_ses = NULL;
d7e09d03
PT		 2135 ptlrpc_server_handle_req_in(svcpt, thread);
2136 lu_context_exit(&env->le_ctx);
2137
2138 /* but limit ourselves in case of flood */
2139 if (counter++ < 100)
2140 continue;
2141 counter = 0;
2142 }
2143
2144 if (ptlrpc_at_check(svcpt))
2145 ptlrpc_at_check_timed(svcpt);
2146
2147 if (ptlrpc_server_request_pending(svcpt, false)) {
2148 lu_context_enter(&env->le_ctx);
2149 ptlrpc_server_handle_request(svcpt, thread);
2150 lu_context_exit(&env->le_ctx);
2151 }
2152
2153 if (ptlrpc_rqbd_pending(svcpt) &&
2154 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2155 /* I just failed to repost request buffers.
2156 * Wait for a timeout (unless something else
dadfcdab
OD		 2157 * happens) before I try again
2158 */
d7e09d03
PT		 2159 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2160 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2161 svcpt->scp_nrqbds_posted);
2162 }
2163 }
2164
5d4450c4 2165 /*
d7e09d03
PT		 2166 lc_watchdog_delete(thread->t_watchdog);
2167 thread->t_watchdog = NULL;
5d4450c4 2168 */
d7e09d03
PT		 2169
2170out_srv_fini:
2171 /*
2172 * deconstruct service specific state created by ptlrpc_start_thread()
2173 */
8b382089 2174 if (svc->srv_ops.so_thr_done)
d7e09d03
PT		 2175 svc->srv_ops.so_thr_done(thread);
2176
8b382089 2177 if (env) {
d7e09d03 2178 lu_context_fini(&env->le_ctx);
9ae10597 2179 kfree(env);
d7e09d03
PT		 2180 }
2181out:
2182 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2183 thread, thread->t_pid, thread->t_id, rc);
2184
2185 spin_lock(&svcpt->scp_lock);
2186 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2187 svcpt->scp_nthrs_starting--;
2188
2189 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2190 /* must know immediately */
2191 svcpt->scp_nthrs_running--;
2192 }
2193
2194 thread->t_id = rc;
2195 thread_add_flags(thread, SVC_STOPPED);
2196
2197 wake_up(&thread->t_ctl_waitq);
2198 spin_unlock(&svcpt->scp_lock);
2199
2200 return rc;
2201}
2202
2203static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2204 struct list_head *replies)
2205{
2206 int result;
2207
2208 spin_lock(&hrt->hrt_lock);
2209
2210 list_splice_init(&hrt->hrt_queue, replies);
2211 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2212
2213 spin_unlock(&hrt->hrt_lock);
2214 return result;
2215}
2216
2217/**
2218 * Main body of "handle reply" function.
2219 * It processes acked reply states
2220 */
2221static int ptlrpc_hr_main(void *arg)
2222{
864ef621 2223 struct ptlrpc_hr_thread *hrt = arg;
d0bfef31 2224 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
24721b29 2225 LIST_HEAD(replies);
d0bfef31
CH		 2226 char threadname[20];
2227 int rc;
d7e09d03
PT		 2228
2229 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2230 hrp->hrp_cpt, hrt->hrt_id);
2231 unshare_fs_struct();
2232
2233 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2234 if (rc != 0) {
2235 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2236 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2237 }
2238
2239 atomic_inc(&hrp->hrp_nstarted);
2240 wake_up(&ptlrpc_hr.hr_waitq);
2241
2242 while (!ptlrpc_hr.hr_stopping) {
2243 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2244
2245 while (!list_empty(&replies)) {
2246 struct ptlrpc_reply_state *rs;
2247
30c0aa39
OD		 2248 rs = list_entry(replies.prev, struct ptlrpc_reply_state,
2249 rs_list);
d7e09d03
PT		 2250 list_del_init(&rs->rs_list);
2251 ptlrpc_handle_rs(rs);
2252 }
2253 }
2254
2255 atomic_inc(&hrp->hrp_nstopped);
2256 wake_up(&ptlrpc_hr.hr_waitq);
2257
2258 return 0;
2259}
2260
2261static void ptlrpc_stop_hr_threads(void)
2262{
d0bfef31
CH		 2263 struct ptlrpc_hr_partition *hrp;
2264 int i;
2265 int j;
d7e09d03
PT		 2266
2267 ptlrpc_hr.hr_stopping = 1;
2268
2269 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
8b382089 2270 if (!hrp->hrp_thrs)
d7e09d03
PT		 2271 continue; /* uninitialized */
2272 for (j = 0; j < hrp->hrp_nthrs; j++)
2273 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2274 }
2275
2276 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
8b382089 2277 if (!hrp->hrp_thrs)
d7e09d03
PT		 2278 continue; /* uninitialized */
2279 wait_event(ptlrpc_hr.hr_waitq,
30c0aa39
OD		 2280 atomic_read(&hrp->hrp_nstopped) ==
2281 atomic_read(&hrp->hrp_nstarted));
d7e09d03
PT		 2282 }
2283}
2284
2285static int ptlrpc_start_hr_threads(void)
2286{
d0bfef31
CH		 2287 struct ptlrpc_hr_partition *hrp;
2288 int i;
2289 int j;
d7e09d03
PT		 2290
2291 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
d0bfef31 2292 int rc = 0;
d7e09d03
PT		 2293
2294 for (j = 0; j < hrp->hrp_nthrs; j++) {
2295 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
060c2820 2296 struct task_struct *task;
50ffcb7e 2297
060c2820 2298 task = kthread_run(ptlrpc_hr_main,
30c0aa39
OD		 2299 &hrp->hrp_thrs[j],
2300 "ptlrpc_hr%02d_%03d",
2301 hrp->hrp_cpt, hrt->hrt_id);
060c2820
JH		 2302 if (IS_ERR(task)) {
2303 rc = PTR_ERR(task);
d7e09d03 2304 break;
060c2820 2305 }
d7e09d03
PT		 2306 }
2307 wait_event(ptlrpc_hr.hr_waitq,
30c0aa39 2308 atomic_read(&hrp->hrp_nstarted) == j);
d7e09d03 2309
060c2820
JH		 2310 if (rc < 0) {
2311 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
2312 i, j, rc);
2313 ptlrpc_stop_hr_threads();
2314 return rc;
2315 }
d7e09d03 2316 }
0a3bdb00 2317 return 0;
d7e09d03
PT		 2318}
2319
2320static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2321{
d0bfef31
CH		 2322 struct l_wait_info lwi = { 0 };
2323 struct ptlrpc_thread *thread;
24721b29 2324 LIST_HEAD(zombie);
d7e09d03 2325
d7e09d03
PT		 2326 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2327 svcpt->scp_service->srv_name);
2328
2329 spin_lock(&svcpt->scp_lock);
2330 /* let the thread know that we would like it to stop asap */
2331 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2332 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2333 svcpt->scp_service->srv_thread_name, thread->t_id);
2334 thread_add_flags(thread, SVC_STOPPING);
2335 }
2336
2337 wake_up_all(&svcpt->scp_waitq);
2338
2339 while (!list_empty(&svcpt->scp_threads)) {
2340 thread = list_entry(svcpt->scp_threads.next,
30c0aa39 2341 struct ptlrpc_thread, t_link);
d7e09d03
PT		 2342 if (thread_is_stopped(thread)) {
2343 list_del(&thread->t_link);
2344 list_add(&thread->t_link, &zombie);
2345 continue;
2346 }
2347 spin_unlock(&svcpt->scp_lock);
2348
2349 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2350 svcpt->scp_service->srv_thread_name, thread->t_id);
2351 l_wait_event(thread->t_ctl_waitq,
2352 thread_is_stopped(thread), &lwi);
2353
2354 spin_lock(&svcpt->scp_lock);
2355 }
2356
2357 spin_unlock(&svcpt->scp_lock);
2358
2359 while (!list_empty(&zombie)) {
2360 thread = list_entry(zombie.next,
24c198e9 2361 struct ptlrpc_thread, t_link);
d7e09d03 2362 list_del(&thread->t_link);
9ae10597 2363 kfree(thread);
d7e09d03 2364 }
d7e09d03
PT		 2365}
2366
2367/**
2368 * Stops all threads of a particular service \a svc
2369 */
230a8da1 2370static void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
d7e09d03
PT		 2371{
2372 struct ptlrpc_service_part *svcpt;
d0bfef31 2373 int i;
d7e09d03
PT		 2374
2375 ptlrpc_service_for_each_part(svcpt, i, svc) {
8b382089 2376 if (svcpt->scp_service)
d7e09d03
PT		 2377 ptlrpc_svcpt_stop_threads(svcpt);
2378 }
d7e09d03 2379}
d7e09d03
PT		 2380
2381int ptlrpc_start_threads(struct ptlrpc_service *svc)
2382{
d0bfef31
CH		 2383 int rc = 0;
2384 int i;
2385 int j;
d7e09d03
PT		 2386
2387 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2388 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2389
2390 for (i = 0; i < svc->srv_ncpts; i++) {
2391 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2392 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2393 if (rc == 0)
2394 continue;
2395
2396 if (rc != -EMFILE)
2397 goto failed;
2398 /* We have enough threads, don't start more. b=15759 */
2399 break;
2400 }
2401 }
2402
0a3bdb00 2403 return 0;
d7e09d03
PT		 2404 failed:
2405 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2406 svc->srv_thread_name, i, j, rc);
2407 ptlrpc_stop_all_threads(svc);
0a3bdb00 2408 return rc;
d7e09d03
PT		 2409}
2410EXPORT_SYMBOL(ptlrpc_start_threads);
2411
2412int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2413{
d0bfef31
CH		 2414 struct l_wait_info lwi = { 0 };
2415 struct ptlrpc_thread *thread;
2416 struct ptlrpc_service *svc;
060c2820 2417 struct task_struct *task;
d0bfef31 2418 int rc;
d7e09d03 2419
d7e09d03
PT		 2420 svc = svcpt->scp_service;
2421
2422 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2423 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2424 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2425
2426 again:
2427 if (unlikely(svc->srv_is_stopping))
0a3bdb00 2428 return -ESRCH;
d7e09d03
PT		 2429
2430 if (!ptlrpc_threads_increasable(svcpt) ||
2431 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2432 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
0a3bdb00 2433 return -EMFILE;
d7e09d03 2434
bae97e81
JL		 2435 thread = kzalloc_node(sizeof(*thread), GFP_NOFS,
2436 cfs_cpt_spread_node(svc->srv_cptable,
2437 svcpt->scp_cpt));
8b382089 2438 if (!thread)
0a3bdb00 2439 return -ENOMEM;
d7e09d03
PT		 2440 init_waitqueue_head(&thread->t_ctl_waitq);
2441
2442 spin_lock(&svcpt->scp_lock);
2443 if (!ptlrpc_threads_increasable(svcpt)) {
2444 spin_unlock(&svcpt->scp_lock);
9ae10597 2445 kfree(thread);
0a3bdb00 2446 return -EMFILE;
d7e09d03
PT		 2447 }
2448
2449 if (svcpt->scp_nthrs_starting != 0) {
2450 /* serialize starting because some modules (obdfilter)
dadfcdab
OD		 2451 * might require unique and contiguous t_id
2452 */
d7e09d03
PT		 2453 LASSERT(svcpt->scp_nthrs_starting == 1);
2454 spin_unlock(&svcpt->scp_lock);
9ae10597 2455 kfree(thread);
d7e09d03
PT		 2456 if (wait) {
2457 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2458 svc->srv_thread_name, svcpt->scp_thr_nextid);
2459 schedule();
2460 goto again;
2461 }
2462
2463 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2464 svc->srv_thread_name, svcpt->scp_thr_nextid);
0a3bdb00 2465 return -EAGAIN;
d7e09d03
PT		 2466 }
2467
2468 svcpt->scp_nthrs_starting++;
2469 thread->t_id = svcpt->scp_thr_nextid++;
2470 thread_add_flags(thread, SVC_STARTING);
2471 thread->t_svcpt = svcpt;
2472
2473 list_add(&thread->t_link, &svcpt->scp_threads);
2474 spin_unlock(&svcpt->scp_lock);
2475
2476 if (svcpt->scp_cpt >= 0) {
9edf0f67 2477 snprintf(thread->t_name, sizeof(thread->t_name), "%s%02d_%03d",
d7e09d03
PT		 2478 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2479 } else {
9edf0f67 2480 snprintf(thread->t_name, sizeof(thread->t_name), "%s_%04d",
d7e09d03
PT		 2481 svc->srv_thread_name, thread->t_id);
2482 }
2483
2484 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
060c2820
JH		 2485 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2486 if (IS_ERR(task)) {
2487 rc = PTR_ERR(task);
2488 CERROR("cannot start thread '%s': rc = %d\n",
d7e09d03
PT		 2489 thread->t_name, rc);
2490 spin_lock(&svcpt->scp_lock);
d7e09d03 2491 --svcpt->scp_nthrs_starting;
5be8e070 2492 if (thread_is_stopping(thread)) {
369e5c9a 2493 /* this ptlrpc_thread is being handled
5be8e070
HN		 2494 * by ptlrpc_svcpt_stop_threads now
2495 */
2496 thread_add_flags(thread, SVC_STOPPED);
2497 wake_up(&thread->t_ctl_waitq);
2498 spin_unlock(&svcpt->scp_lock);
2499 } else {
2500 list_del(&thread->t_link);
2501 spin_unlock(&svcpt->scp_lock);
9ae10597 2502 kfree(thread);
5be8e070 2503 }
0a3bdb00 2504 return rc;
d7e09d03
PT		 2505 }
2506
2507 if (!wait)
0a3bdb00 2508 return 0;
d7e09d03
PT		 2509
2510 l_wait_event(thread->t_ctl_waitq,
2511 thread_is_running(thread) || thread_is_stopped(thread),
2512 &lwi);
2513
2514 rc = thread_is_stopped(thread) ? thread->t_id : 0;
0a3bdb00 2515 return rc;
d7e09d03
PT		 2516}
2517
2518int ptlrpc_hr_init(void)
2519{
d0bfef31
CH		 2520 struct ptlrpc_hr_partition *hrp;
2521 struct ptlrpc_hr_thread *hrt;
2522 int rc;
2523 int i;
2524 int j;
2525 int weight;
d7e09d03
PT		 2526
2527 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2528 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2529
2530 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2531 sizeof(*hrp));
8b382089 2532 if (!ptlrpc_hr.hr_partitions)
0a3bdb00 2533 return -ENOMEM;
d7e09d03
PT		 2534
2535 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2536
06931e62 2537 weight = cpumask_weight(topology_sibling_cpumask(0));
3867ea5a 2538
d7e09d03
PT		 2539 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2540 hrp->hrp_cpt = i;
2541
2542 atomic_set(&hrp->hrp_nstarted, 0);
2543 atomic_set(&hrp->hrp_nstopped, 0);
2544
2545 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
3867ea5a 2546 hrp->hrp_nthrs /= weight;
d7e09d03
PT		 2547
2548 LASSERT(hrp->hrp_nthrs > 0);
bae97e81
JL		 2549 hrp->hrp_thrs =
2550 kzalloc_node(hrp->hrp_nthrs * sizeof(*hrt), GFP_NOFS,
24c198e9
OD		 2551 cfs_cpt_spread_node(ptlrpc_hr.hr_cpt_table,
2552 i));
8b382089 2553 if (!hrp->hrp_thrs) {
a9b3e8f3
JL		 2554 rc = -ENOMEM;
2555 goto out;
2556 }
d7e09d03
PT		 2557
2558 for (j = 0; j < hrp->hrp_nthrs; j++) {
2559 hrt = &hrp->hrp_thrs[j];
2560
2561 hrt->hrt_id = j;
2562 hrt->hrt_partition = hrp;
2563 init_waitqueue_head(&hrt->hrt_waitq);
2564 spin_lock_init(&hrt->hrt_lock);
2565 INIT_LIST_HEAD(&hrt->hrt_queue);
2566 }
2567 }
2568
2569 rc = ptlrpc_start_hr_threads();
2570out:
2571 if (rc != 0)
2572 ptlrpc_hr_fini();
0a3bdb00 2573 return rc;
d7e09d03
PT		 2574}
2575
2576void ptlrpc_hr_fini(void)
2577{
d0bfef31
CH		 2578 struct ptlrpc_hr_partition *hrp;
2579 int i;
d7e09d03 2580
8b382089 2581 if (!ptlrpc_hr.hr_partitions)
d7e09d03
PT		 2582 return;
2583
2584 ptlrpc_stop_hr_threads();
2585
2586 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
a5cb8880 2587 kfree(hrp->hrp_thrs);
d7e09d03
PT		 2588 }
2589
2590 cfs_percpt_free(ptlrpc_hr.hr_partitions);
2591 ptlrpc_hr.hr_partitions = NULL;
2592}
2593
d7e09d03
PT		 2594/**
2595 * Wait until all already scheduled replies are processed.
2596 */
2597static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
2598{
2599 while (1) {
2600 int rc;
2601 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2602 NULL, NULL);
2603
2604 rc = l_wait_event(svcpt->scp_waitq,
24c198e9
OD		 2605 atomic_read(&svcpt->scp_nreps_difficult) == 0,
2606 &lwi);
d7e09d03
PT		 2607 if (rc == 0)
2608 break;
2609 CWARN("Unexpectedly long timeout %s %p\n",
2610 svcpt->scp_service->srv_name, svcpt->scp_service);
2611 }
2612}
2613
2614static void
2615ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
2616{
d0bfef31
CH		 2617 struct ptlrpc_service_part *svcpt;
2618 int i;
d7e09d03
PT		 2619
2620 /* early disarm AT timer... */
2621 ptlrpc_service_for_each_part(svcpt, i, svc) {
8b382089 2622 if (svcpt->scp_service)
922da0c5 2623 del_timer(&svcpt->scp_at_timer);
d7e09d03
PT		 2624 }
2625}
2626
2627static void
2628ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
2629{
d0bfef31 2630 struct ptlrpc_service_part *svcpt;
d7e09d03 2631 struct ptlrpc_request_buffer_desc *rqbd;
d0bfef31
CH		 2632 struct l_wait_info lwi;
2633 int rc;
2634 int i;
d7e09d03
PT		 2635
2636 /* All history will be culled when the next request buffer is
dadfcdab
OD		 2637 * freed in ptlrpc_service_purge_all()
2638 */
d7e09d03
PT		 2639 svc->srv_hist_nrqbds_cpt_max = 0;
2640
2641 rc = LNetClearLazyPortal(svc->srv_req_portal);
2642 LASSERT(rc == 0);
2643
2644 ptlrpc_service_for_each_part(svcpt, i, svc) {
8b382089 2645 if (!svcpt->scp_service)
d7e09d03
PT		 2646 break;
2647
2648 /* Unlink all the request buffers. This forces a 'final'
dadfcdab
OD		 2649 * event with its 'unlink' flag set for each posted rqbd
2650 */
d7e09d03 2651 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
24c198e9 2652 rqbd_list) {
d7e09d03
PT		 2653 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2654 LASSERT(rc == 0 || rc == -ENOENT);
2655 }
2656 }
2657
2658 ptlrpc_service_for_each_part(svcpt, i, svc) {
8b382089 2659 if (!svcpt->scp_service)
d7e09d03
PT		 2660 break;
2661
2662 /* Wait for the network to release any buffers
dadfcdab
OD		 2663 * it's currently filling
2664 */
d7e09d03
PT		 2665 spin_lock(&svcpt->scp_lock);
2666 while (svcpt->scp_nrqbds_posted != 0) {
2667 spin_unlock(&svcpt->scp_lock);
2668 /* Network access will complete in finite time but
2669 * the HUGE timeout lets us CWARN for visibility
dadfcdab
OD		 2670 * of sluggish LNDs
2671 */
d7e09d03
PT		 2672 lwi = LWI_TIMEOUT_INTERVAL(
2673 cfs_time_seconds(LONG_UNLINK),
2674 cfs_time_seconds(1), NULL, NULL);
2675 rc = l_wait_event(svcpt->scp_waitq,
2676 svcpt->scp_nrqbds_posted == 0, &lwi);
2677 if (rc == -ETIMEDOUT) {
2d00bd17 2678 CWARN("Service %s waiting for request buffers\n",
d7e09d03
PT		 2679 svcpt->scp_service->srv_name);
2680 }
2681 spin_lock(&svcpt->scp_lock);
2682 }
2683 spin_unlock(&svcpt->scp_lock);
2684 }
2685}
2686
2687static void
2688ptlrpc_service_purge_all(struct ptlrpc_service *svc)
2689{
d0bfef31
CH		 2690 struct ptlrpc_service_part *svcpt;
2691 struct ptlrpc_request_buffer_desc *rqbd;
2692 struct ptlrpc_request *req;
2693 struct ptlrpc_reply_state *rs;
2694 int i;
d7e09d03
PT		 2695
2696 ptlrpc_service_for_each_part(svcpt, i, svc) {
8b382089 2697 if (!svcpt->scp_service)
d7e09d03
PT		 2698 break;
2699
2700 spin_lock(&svcpt->scp_rep_lock);
2701 while (!list_empty(&svcpt->scp_rep_active)) {
2702 rs = list_entry(svcpt->scp_rep_active.next,
30c0aa39 2703 struct ptlrpc_reply_state, rs_list);
d7e09d03
PT		 2704 spin_lock(&rs->rs_lock);
2705 ptlrpc_schedule_difficult_reply(rs);
2706 spin_unlock(&rs->rs_lock);
2707 }
2708 spin_unlock(&svcpt->scp_rep_lock);
2709
2710 /* purge the request queue. NB No new replies (rqbds
2711 * all unlinked) and no service threads, so I'm the only
dadfcdab
OD		 2712 * thread noodling the request queue now
2713 */
d7e09d03
PT		 2714 while (!list_empty(&svcpt->scp_req_incoming)) {
2715 req = list_entry(svcpt->scp_req_incoming.next,
30c0aa39 2716 struct ptlrpc_request, rq_list);
d7e09d03
PT		 2717
2718 list_del(&req->rq_list);
2719 svcpt->scp_nreqs_incoming--;
2720 ptlrpc_server_finish_request(svcpt, req);
2721 }
2722
2723 while (ptlrpc_server_request_pending(svcpt, true)) {
2724 req = ptlrpc_server_request_get(svcpt, true);
2725 ptlrpc_server_finish_active_request(svcpt, req);
2726 }
2727
2728 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
2729 LASSERT(svcpt->scp_nreqs_incoming == 0);
2730 LASSERT(svcpt->scp_nreqs_active == 0);
2731 /* history should have been culled by
dadfcdab
OD		 2732 * ptlrpc_server_finish_request
2733 */
d7e09d03
PT		 2734 LASSERT(svcpt->scp_hist_nrqbds == 0);
2735
2736 /* Now free all the request buffers since nothing
dadfcdab
OD		 2737 * references them any more...
2738 */
d7e09d03
PT		 2739
2740 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2741 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
30c0aa39
OD		 2742 struct ptlrpc_request_buffer_desc,
2743 rqbd_list);
d7e09d03
PT		 2744 ptlrpc_free_rqbd(rqbd);
2745 }
2746 ptlrpc_wait_replies(svcpt);
2747
2748 while (!list_empty(&svcpt->scp_rep_idle)) {
2749 rs = list_entry(svcpt->scp_rep_idle.next,
30c0aa39
OD		 2750 struct ptlrpc_reply_state,
2751 rs_list);
d7e09d03 2752 list_del(&rs->rs_list);
ee0ec194 2753 kvfree(rs);
d7e09d03
PT		 2754 }
2755 }
2756}
2757
2758static void
2759ptlrpc_service_free(struct ptlrpc_service *svc)
2760{
d0bfef31
CH		 2761 struct ptlrpc_service_part *svcpt;
2762 struct ptlrpc_at_array *array;
2763 int i;
d7e09d03
PT		 2764
2765 ptlrpc_service_for_each_part(svcpt, i, svc) {
8b382089 2766 if (!svcpt->scp_service)
d7e09d03
PT		 2767 break;
2768
2769 /* In case somebody rearmed this in the meantime */
922da0c5 2770 del_timer(&svcpt->scp_at_timer);
d7e09d03
PT		 2771 array = &svcpt->scp_at_array;
2772
207e99c2
JL		 2773 kfree(array->paa_reqs_array);
2774 array->paa_reqs_array = NULL;
2775 kfree(array->paa_reqs_count);
2776 array->paa_reqs_count = NULL;
d7e09d03
PT		 2777 }
2778
2779 ptlrpc_service_for_each_part(svcpt, i, svc)
9ae10597 2780 kfree(svcpt);
d7e09d03 2781
8b382089 2782 if (svc->srv_cpts)
d7e09d03
PT		 2783 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
2784
9ae10597 2785 kfree(svc);
d7e09d03
PT		 2786}
2787
2788int ptlrpc_unregister_service(struct ptlrpc_service *service)
2789{
d7e09d03
PT		 2790 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
2791
2792 service->srv_is_stopping = 1;
2793
2794 mutex_lock(&ptlrpc_all_services_mutex);
2795 list_del_init(&service->srv_list);
2796 mutex_unlock(&ptlrpc_all_services_mutex);
2797
2798 ptlrpc_service_del_atimer(service);
2799 ptlrpc_stop_all_threads(service);
2800
2801 ptlrpc_service_unlink_rqbd(service);
2802 ptlrpc_service_purge_all(service);
2803 ptlrpc_service_nrs_cleanup(service);
2804
2805 ptlrpc_lprocfs_unregister_service(service);
328676f8 2806 ptlrpc_sysfs_unregister_service(service);
d7e09d03
PT		 2807
2808 ptlrpc_service_free(service);
2809
0a3bdb00 2810 return 0;
d7e09d03
PT		 2811}
2812EXPORT_SYMBOL(ptlrpc_unregister_service);
Linux kernel - Deliverables
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