lustre/ptlrpc/nrs_tbf.c

   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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (C) 2013 DataDirect Networks, Inc.
  24  *
  25  * Copyright (c) 2014, Intel Corporation.
  26  */
  27 /*
  28  * lustre/ptlrpc/nrs_tbf.c
  29  *
  30  * Network Request Scheduler (NRS) Token Bucket Filter(TBF) policy
  31  *
  32  */
  33
  34 #ifdef HAVE_SERVER_SUPPORT
  35
  36 /**
  37  * \addtogoup nrs
  38  * @{
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_RPC
  42 #include <obd_support.h>
  43 #include <obd_class.h>
  44 #include <libcfs/libcfs.h>
  45 #include "ptlrpc_internal.h"
  46
  47 /**
  48  * \name tbf
  49  *
  50  * Token Bucket Filter over client NIDs
  51  *
  52  * @{
  53  */
  54
  55 #define NRS_POL_NAME_TBF        "tbf"
  56
  57 static int tbf_jobid_cache_size = 8192;
  58 CFS_MODULE_PARM(tbf_jobid_cache_size, "i", int, 0644,
  59                 "The size of jobid cache");
  60
  61 static int tbf_rate = 10000;
  62 CFS_MODULE_PARM(tbf_rate, "i", int, 0644,
  63                 "Default rate limit in RPCs/s");
  64
  65 static int tbf_depth = 3;
  66 CFS_MODULE_PARM(tbf_depth, "i", int, 0644,
  67                 "How many tokens that a client can save up");
  68
  69 static enum hrtimer_restart nrs_tbf_timer_cb(struct hrtimer *timer)
  70 {
  71         struct nrs_tbf_head *head = container_of(timer, struct nrs_tbf_head,
  72                                                  th_timer);
  73         struct ptlrpc_nrs   *nrs = head->th_res.res_policy->pol_nrs;
  74         struct ptlrpc_service_part *svcpt = nrs->nrs_svcpt;
  75
  76         spin_lock(&nrs->nrs_lock);
  77         nrs->nrs_throttling = 0;
  78         spin_unlock(&nrs->nrs_lock);
  79         wake_up(&svcpt->scp_waitq);
  80
  81         return HRTIMER_NORESTART;
  82 }
  83
  84 #define NRS_TBF_DEFAULT_RULE "default"
  85
  86 static void nrs_tbf_rule_fini(struct nrs_tbf_rule *rule)
  87 {
  88         LASSERT(atomic_read(&rule->tr_ref) == 0);
  89         LASSERT(list_empty(&rule->tr_cli_list));
  90         LASSERT(list_empty(&rule->tr_linkage));
  91
  92         rule->tr_head->th_ops->o_rule_fini(rule);
  93         OBD_FREE_PTR(rule);
  94 }
  95
  96 /**
  97  * Decreases the rule's usage reference count, and stops the rule in case it
  98  * was already stopping and have no more outstanding usage references (which
  99  * indicates it has no more queued or started requests, and can be safely
 100  * stopped).
 101  */
 102 static void nrs_tbf_rule_put(struct nrs_tbf_rule *rule)
 103 {
 104         if (atomic_dec_and_test(&rule->tr_ref))
 105                 nrs_tbf_rule_fini(rule);
 106 }
 107
 108 /**
 109  * Increases the rule's usage reference count.
 110  */
 111 static inline void nrs_tbf_rule_get(struct nrs_tbf_rule *rule)
 112 {
 113         atomic_inc(&rule->tr_ref);
 114 }
 115
 116 static void
 117 nrs_tbf_cli_rule_put(struct nrs_tbf_client *cli)
 118 {
 119         LASSERT(!list_empty(&cli->tc_linkage));
 120         LASSERT(cli->tc_rule);
 121         list_del_init(&cli->tc_linkage);
 122         nrs_tbf_rule_put(cli->tc_rule);
 123         cli->tc_rule = NULL;
 124 }
 125
 126 static void
 127 nrs_tbf_cli_reset_value(struct nrs_tbf_head *head,
 128                         struct nrs_tbf_client *cli)
 129
 130 {
 131         struct nrs_tbf_rule *rule = cli->tc_rule;
 132
 133         cli->tc_rpc_rate = rule->tr_rpc_rate;
 134         cli->tc_nsecs = rule->tr_nsecs;
 135         cli->tc_depth = rule->tr_depth;
 136         cli->tc_ntoken = rule->tr_depth;
 137         cli->tc_check_time = ktime_to_ns(ktime_get());
 138         cli->tc_rule_sequence = atomic_read(&head->th_rule_sequence);
 139         cli->tc_rule_generation = rule->tr_generation;
 140
 141         if (cli->tc_in_heap)
 142                 cfs_binheap_relocate(head->th_binheap,
 143                                      &cli->tc_node);
 144 }
 145
 146 static void
 147 nrs_tbf_cli_reset(struct nrs_tbf_head *head,
 148                   struct nrs_tbf_rule *rule,
 149                   struct nrs_tbf_client *cli)
 150 {
 151         if (!list_empty(&cli->tc_linkage)) {
 152                 LASSERT(rule != cli->tc_rule);
 153                 nrs_tbf_cli_rule_put(cli);
 154         }
 155         LASSERT(cli->tc_rule == NULL);
 156         LASSERT(list_empty(&cli->tc_linkage));
 157         /* Rule's ref is added before called */
 158         cli->tc_rule = rule;
 159         list_add_tail(&cli->tc_linkage, &rule->tr_cli_list);
 160         nrs_tbf_cli_reset_value(head, cli);
 161 }
 162
 163 static int
 164 nrs_tbf_rule_dump(struct nrs_tbf_rule *rule, struct seq_file *m)
 165 {
 166         return rule->tr_head->th_ops->o_rule_dump(rule, m);
 167 }
 168
 169 static int
 170 nrs_tbf_rule_dump_all(struct nrs_tbf_head *head, struct seq_file *m)
 171 {
 172         struct nrs_tbf_rule *rule;
 173         int rc = 0;
 174
 175         LASSERT(head != NULL);
 176         spin_lock(&head->th_rule_lock);
 177         /* List the rules from newest to oldest */
 178         list_for_each_entry(rule, &head->th_list, tr_linkage) {
 179                 LASSERT((rule->tr_flags & NTRS_STOPPING) == 0);
 180                 rc = nrs_tbf_rule_dump(rule, m);
 181                 if (rc) {
 182                         rc = -ENOSPC;
 183                         break;
 184                 }
 185         }
 186         spin_unlock(&head->th_rule_lock);
 187
 188         return rc;
 189 }
 190
 191 static struct nrs_tbf_rule *
 192 nrs_tbf_rule_find_nolock(struct nrs_tbf_head *head,
 193                          const char *name)
 194 {
 195         struct nrs_tbf_rule *rule;
 196
 197         LASSERT(head != NULL);
 198         list_for_each_entry(rule, &head->th_list, tr_linkage) {
 199                 LASSERT((rule->tr_flags & NTRS_STOPPING) == 0);
 200                 if (strcmp(rule->tr_name, name) == 0) {
 201                         nrs_tbf_rule_get(rule);
 202                         return rule;
 203                 }
 204         }
 205         return NULL;
 206 }
 207
 208 static struct nrs_tbf_rule *
 209 nrs_tbf_rule_find(struct nrs_tbf_head *head,
 210                   const char *name)
 211 {
 212         struct nrs_tbf_rule *rule;
 213
 214         LASSERT(head != NULL);
 215         spin_lock(&head->th_rule_lock);
 216         rule = nrs_tbf_rule_find_nolock(head, name);
 217         spin_unlock(&head->th_rule_lock);
 218         return rule;
 219 }
 220
 221 static struct nrs_tbf_rule *
 222 nrs_tbf_rule_match(struct nrs_tbf_head *head,
 223                    struct nrs_tbf_client *cli)
 224 {
 225         struct nrs_tbf_rule *rule = NULL;
 226         struct nrs_tbf_rule *tmp_rule;
 227
 228         spin_lock(&head->th_rule_lock);
 229         /* Match the newest rule in the list */
 230         list_for_each_entry(tmp_rule, &head->th_list, tr_linkage) {
 231                 LASSERT((tmp_rule->tr_flags & NTRS_STOPPING) == 0);
 232                 if (head->th_ops->o_rule_match(tmp_rule, cli)) {
 233                         rule = tmp_rule;
 234                         break;
 235                 }
 236         }
 237
 238         if (rule == NULL)
 239                 rule = head->th_rule;
 240
 241         nrs_tbf_rule_get(rule);
 242         spin_unlock(&head->th_rule_lock);
 243         return rule;
 244 }
 245
 246 static void
 247 nrs_tbf_cli_init(struct nrs_tbf_head *head,
 248                  struct nrs_tbf_client *cli,
 249                  struct ptlrpc_request *req)
 250 {
 251         struct nrs_tbf_rule *rule;
 252
 253         cli->tc_in_heap = false;
 254         head->th_ops->o_cli_init(cli, req);
 255         INIT_LIST_HEAD(&cli->tc_list);
 256         INIT_LIST_HEAD(&cli->tc_linkage);
 257         atomic_set(&cli->tc_ref, 1);
 258         rule = nrs_tbf_rule_match(head, cli);
 259         nrs_tbf_cli_reset(head, rule, cli);
 260 }
 261
 262 static void
 263 nrs_tbf_cli_fini(struct nrs_tbf_client *cli)
 264 {
 265         LASSERT(list_empty(&cli->tc_list));
 266         LASSERT(!cli->tc_in_heap);
 267         LASSERT(atomic_read(&cli->tc_ref) == 0);
 268         nrs_tbf_cli_rule_put(cli);
 269         OBD_FREE_PTR(cli);
 270 }
 271
 272 static int
 273 nrs_tbf_rule_start(struct ptlrpc_nrs_policy *policy,
 274                    struct nrs_tbf_head *head,
 275                    struct nrs_tbf_cmd *start)
 276 {
 277         struct nrs_tbf_rule *rule, *tmp_rule;
 278         int rc;
 279
 280         rule = nrs_tbf_rule_find(head, start->tc_name);
 281         if (rule) {
 282                 nrs_tbf_rule_put(rule);
 283                 return -EEXIST;
 284         }
 285
 286         OBD_CPT_ALLOC_PTR(rule, nrs_pol2cptab(policy), nrs_pol2cptid(policy));
 287         if (rule == NULL)
 288                 return -ENOMEM;
 289
 290         memcpy(rule->tr_name, start->tc_name, strlen(start->tc_name));
 291         rule->tr_rpc_rate = start->tc_rpc_rate;
 292         rule->tr_nsecs = NSEC_PER_SEC / rule->tr_rpc_rate;
 293         rule->tr_depth = tbf_depth;
 294         atomic_set(&rule->tr_ref, 1);
 295         INIT_LIST_HEAD(&rule->tr_cli_list);
 296         INIT_LIST_HEAD(&rule->tr_nids);
 297
 298         rc = head->th_ops->o_rule_init(policy, rule, start);
 299         if (rc) {
 300                 OBD_FREE_PTR(rule);
 301                 return rc;
 302         }
 303
 304         /* Add as the newest rule */
 305         spin_lock(&head->th_rule_lock);
 306         tmp_rule = nrs_tbf_rule_find_nolock(head, start->tc_name);
 307         if (tmp_rule) {
 308                 spin_unlock(&head->th_rule_lock);
 309                 nrs_tbf_rule_put(tmp_rule);
 310                 nrs_tbf_rule_put(rule);
 311                 return -EEXIST;
 312         }
 313         list_add(&rule->tr_linkage, &head->th_list);
 314         rule->tr_head = head;
 315         spin_unlock(&head->th_rule_lock);
 316         atomic_inc(&head->th_rule_sequence);
 317         if (start->tc_rule_flags & NTRS_DEFAULT) {
 318                 rule->tr_flags |= NTRS_DEFAULT;
 319                 LASSERT(head->th_rule == NULL);
 320                 head->th_rule = rule;
 321         }
 322
 323         return 0;
 324 }
 325
 326 static int
 327 nrs_tbf_rule_change(struct ptlrpc_nrs_policy *policy,
 328                     struct nrs_tbf_head *head,
 329                     struct nrs_tbf_cmd *change)
 330 {
 331         struct nrs_tbf_rule *rule;
 332
 333         assert_spin_locked(&policy->pol_nrs->nrs_lock);
 334
 335         rule = nrs_tbf_rule_find(head, change->tc_name);
 336         if (rule == NULL)
 337                 return -ENOENT;
 338
 339         rule->tr_rpc_rate = change->tc_rpc_rate;
 340         rule->tr_nsecs = NSEC_PER_SEC / rule->tr_rpc_rate;
 341         rule->tr_generation++;
 342         nrs_tbf_rule_put(rule);
 343
 344         return 0;
 345 }
 346
 347 static int
 348 nrs_tbf_rule_stop(struct ptlrpc_nrs_policy *policy,
 349                   struct nrs_tbf_head *head,
 350                   struct nrs_tbf_cmd *stop)
 351 {
 352         struct nrs_tbf_rule *rule;
 353
 354         assert_spin_locked(&policy->pol_nrs->nrs_lock);
 355
 356         if (strcmp(stop->tc_name, NRS_TBF_DEFAULT_RULE) == 0)
 357                 return -EPERM;
 358
 359         rule = nrs_tbf_rule_find(head, stop->tc_name);
 360         if (rule == NULL)
 361                 return -ENOENT;
 362
 363         list_del_init(&rule->tr_linkage);
 364         rule->tr_flags |= NTRS_STOPPING;
 365         nrs_tbf_rule_put(rule);
 366         nrs_tbf_rule_put(rule);
 367
 368         return 0;
 369 }
 370
 371 static int
 372 nrs_tbf_command(struct ptlrpc_nrs_policy *policy,
 373                 struct nrs_tbf_head *head,
 374                 struct nrs_tbf_cmd *cmd)
 375 {
 376         int rc;
 377
 378         assert_spin_locked(&policy->pol_nrs->nrs_lock);
 379
 380         switch (cmd->tc_cmd) {
 381         case NRS_CTL_TBF_START_RULE:
 382                 if (!(cmd->tc_valid_types & head->th_type_flag))
 383                         return -EINVAL;
 384
 385                 spin_unlock(&policy->pol_nrs->nrs_lock);
 386                 rc = nrs_tbf_rule_start(policy, head, cmd);
 387                 spin_lock(&policy->pol_nrs->nrs_lock);
 388                 return rc;
 389         case NRS_CTL_TBF_CHANGE_RATE:
 390                 rc = nrs_tbf_rule_change(policy, head, cmd);
 391                 return rc;
 392         case NRS_CTL_TBF_STOP_RULE:
 393                 rc = nrs_tbf_rule_stop(policy, head, cmd);
 394                 /* Take it as a success, if not exists at all */
 395                 return rc == -ENOENT ? 0 : rc;
 396         default:
 397                 return -EFAULT;
 398         }
 399 }
 400
 401 /**
 402  * Binary heap predicate.
 403  *
 404  * \param[in] e1 the first binheap node to compare
 405  * \param[in] e2 the second binheap node to compare
 406  *
 407  * \retval 0 e1 > e2
 408  * \retval 1 e1 < e2
 409  */
 410 static int tbf_cli_compare(cfs_binheap_node_t *e1, cfs_binheap_node_t *e2)
 411 {
 412         struct nrs_tbf_client *cli1;
 413         struct nrs_tbf_client *cli2;
 414
 415         cli1 = container_of(e1, struct nrs_tbf_client, tc_node);
 416         cli2 = container_of(e2, struct nrs_tbf_client, tc_node);
 417
 418         if (cli1->tc_check_time + cli1->tc_nsecs <
 419             cli2->tc_check_time + cli2->tc_nsecs)
 420                 return 1;
 421         else if (cli1->tc_check_time + cli1->tc_nsecs >
 422                  cli2->tc_check_time + cli2->tc_nsecs)
 423                 return 0;
 424
 425         if (cli1->tc_check_time < cli2->tc_check_time)
 426                 return 1;
 427         else if (cli1->tc_check_time > cli2->tc_check_time)
 428                 return 0;
 429
 430         /* Maybe need more comparasion, e.g. request number in the rules */
 431         return 1;
 432 }
 433
 434 /**
 435  * TBF binary heap operations
 436  */
 437 static cfs_binheap_ops_t nrs_tbf_heap_ops = {
 438         .hop_enter      = NULL,
 439         .hop_exit       = NULL,
 440         .hop_compare    = tbf_cli_compare,
 441 };
 442
 443 static unsigned nrs_tbf_jobid_hop_hash(struct cfs_hash *hs, const void *key,
 444                                   unsigned mask)
 445 {
 446         return cfs_hash_djb2_hash(key, strlen(key), mask);
 447 }
 448
 449 static int nrs_tbf_jobid_hop_keycmp(const void *key, struct hlist_node *hnode)
 450 {
 451         struct nrs_tbf_client *cli = hlist_entry(hnode,
 452                                                      struct nrs_tbf_client,
 453                                                      tc_hnode);
 454
 455         return (strcmp(cli->tc_jobid, key) == 0);
 456 }
 457
 458 static void *nrs_tbf_jobid_hop_key(struct hlist_node *hnode)
 459 {
 460         struct nrs_tbf_client *cli = hlist_entry(hnode,
 461                                                      struct nrs_tbf_client,
 462                                                      tc_hnode);
 463
 464         return cli->tc_jobid;
 465 }
 466
 467 static void *nrs_tbf_jobid_hop_object(struct hlist_node *hnode)
 468 {
 469         return hlist_entry(hnode, struct nrs_tbf_client, tc_hnode);
 470 }
 471
 472 static void nrs_tbf_jobid_hop_get(struct cfs_hash *hs, struct hlist_node *hnode)
 473 {
 474         struct nrs_tbf_client *cli = hlist_entry(hnode,
 475                                                      struct nrs_tbf_client,
 476                                                      tc_hnode);
 477
 478         atomic_inc(&cli->tc_ref);
 479 }
 480
 481 static void nrs_tbf_jobid_hop_put(struct cfs_hash *hs, struct hlist_node *hnode)
 482 {
 483         struct nrs_tbf_client *cli = hlist_entry(hnode,
 484                                                      struct nrs_tbf_client,
 485                                                      tc_hnode);
 486
 487         atomic_dec(&cli->tc_ref);
 488 }
 489
 490 static void
 491 nrs_tbf_jobid_hop_exit(struct cfs_hash *hs, struct hlist_node *hnode)
 492
 493 {
 494         struct nrs_tbf_client *cli = hlist_entry(hnode,
 495                                                  struct nrs_tbf_client,
 496                                                  tc_hnode);
 497
 498         LASSERT(atomic_read(&cli->tc_ref) == 0);
 499         nrs_tbf_cli_fini(cli);
 500 }
 501
 502 static struct cfs_hash_ops nrs_tbf_jobid_hash_ops = {
 503         .hs_hash        = nrs_tbf_jobid_hop_hash,
 504         .hs_keycmp      = nrs_tbf_jobid_hop_keycmp,
 505         .hs_key         = nrs_tbf_jobid_hop_key,
 506         .hs_object      = nrs_tbf_jobid_hop_object,
 507         .hs_get         = nrs_tbf_jobid_hop_get,
 508         .hs_put         = nrs_tbf_jobid_hop_put,
 509         .hs_put_locked  = nrs_tbf_jobid_hop_put,
 510         .hs_exit        = nrs_tbf_jobid_hop_exit,
 511 };
 512
 513 #define NRS_TBF_JOBID_HASH_FLAGS (CFS_HASH_SPIN_BKTLOCK | \
 514                                   CFS_HASH_NO_ITEMREF | \
 515                                   CFS_HASH_DEPTH)
 516
 517 static struct nrs_tbf_client *
 518 nrs_tbf_jobid_hash_lookup(struct cfs_hash *hs,
 519                           struct cfs_hash_bd *bd,
 520                           const char *jobid)
 521 {
 522         struct hlist_node *hnode;
 523         struct nrs_tbf_client *cli;
 524
 525         /* cfs_hash_bd_peek_locked is a somehow "internal" function
 526          * of cfs_hash, it doesn't add refcount on object. */
 527         hnode = cfs_hash_bd_peek_locked(hs, bd, (void *)jobid);
 528         if (hnode == NULL)
 529                 return NULL;
 530
 531         cfs_hash_get(hs, hnode);
 532         cli = container_of0(hnode, struct nrs_tbf_client, tc_hnode);
 533         if (!list_empty(&cli->tc_lru))
 534                 list_del_init(&cli->tc_lru);
 535         return cli;
 536 }
 537
 538 #define NRS_TBF_JOBID_NULL ""
 539
 540 static struct nrs_tbf_client *
 541 nrs_tbf_jobid_cli_find(struct nrs_tbf_head *head,
 542                        struct ptlrpc_request *req)
 543 {
 544         const char              *jobid;
 545         struct nrs_tbf_client   *cli;
 546         struct cfs_hash         *hs = head->th_cli_hash;
 547         struct cfs_hash_bd               bd;
 548
 549         jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 550         if (jobid == NULL)
 551                 jobid = NRS_TBF_JOBID_NULL;
 552         cfs_hash_bd_get_and_lock(hs, (void *)jobid, &bd, 1);
 553         cli = nrs_tbf_jobid_hash_lookup(hs, &bd, jobid);
 554         cfs_hash_bd_unlock(hs, &bd, 1);
 555
 556         return cli;
 557 }
 558
 559 static struct nrs_tbf_client *
 560 nrs_tbf_jobid_cli_findadd(struct nrs_tbf_head *head,
 561                           struct nrs_tbf_client *cli)
 562 {
 563         const char              *jobid;
 564         struct nrs_tbf_client   *ret;
 565         struct cfs_hash         *hs = head->th_cli_hash;
 566         struct cfs_hash_bd               bd;
 567
 568         jobid = cli->tc_jobid;
 569         cfs_hash_bd_get_and_lock(hs, (void *)jobid, &bd, 1);
 570         ret = nrs_tbf_jobid_hash_lookup(hs, &bd, jobid);
 571         if (ret == NULL) {
 572                 cfs_hash_bd_add_locked(hs, &bd, &cli->tc_hnode);
 573                 ret = cli;
 574         }
 575         cfs_hash_bd_unlock(hs, &bd, 1);
 576
 577         return ret;
 578 }
 579
 580 static void
 581 nrs_tbf_jobid_cli_put(struct nrs_tbf_head *head,
 582                       struct nrs_tbf_client *cli)
 583 {
 584         struct cfs_hash_bd               bd;
 585         struct cfs_hash         *hs = head->th_cli_hash;
 586         struct nrs_tbf_bucket   *bkt;
 587         int                      hw;
 588         struct list_head        zombies;
 589
 590         INIT_LIST_HEAD(&zombies);
 591         cfs_hash_bd_get(hs, &cli->tc_jobid, &bd);
 592         bkt = cfs_hash_bd_extra_get(hs, &bd);
 593         if (!cfs_hash_bd_dec_and_lock(hs, &bd, &cli->tc_ref))
 594                 return;
 595         LASSERT(list_empty(&cli->tc_lru));
 596         list_add_tail(&cli->tc_lru, &bkt->ntb_lru);
 597
 598         /*
 599          * Check and purge the LRU, there is at least one client in the LRU.
 600          */
 601         hw = tbf_jobid_cache_size >>
 602              (hs->hs_cur_bits - hs->hs_bkt_bits);
 603         while (cfs_hash_bd_count_get(&bd) > hw) {
 604                 if (unlikely(list_empty(&bkt->ntb_lru)))
 605                         break;
 606                 cli = list_entry(bkt->ntb_lru.next,
 607                                      struct nrs_tbf_client,
 608                                      tc_lru);
 609                 LASSERT(atomic_read(&cli->tc_ref) == 0);
 610                 cfs_hash_bd_del_locked(hs, &bd, &cli->tc_hnode);
 611                 list_move(&cli->tc_lru, &zombies);
 612         }
 613         cfs_hash_bd_unlock(head->th_cli_hash, &bd, 1);
 614
 615         while (!list_empty(&zombies)) {
 616                 cli = container_of0(zombies.next,
 617                                     struct nrs_tbf_client, tc_lru);
 618                 list_del_init(&cli->tc_lru);
 619                 nrs_tbf_cli_fini(cli);
 620         }
 621 }
 622
 623 static void
 624 nrs_tbf_jobid_cli_init(struct nrs_tbf_client *cli,
 625                        struct ptlrpc_request *req)
 626 {
 627         char *jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 628
 629         if (jobid == NULL)
 630                 jobid = NRS_TBF_JOBID_NULL;
 631         LASSERT(strlen(jobid) < LUSTRE_JOBID_SIZE);
 632         INIT_LIST_HEAD(&cli->tc_lru);
 633         memcpy(cli->tc_jobid, jobid, strlen(jobid));
 634 }
 635
 636 static int nrs_tbf_jobid_hash_order(void)
 637 {
 638         int bits;
 639
 640         for (bits = 1; (1 << bits) < tbf_jobid_cache_size; ++bits)
 641                 ;
 642
 643         return bits;
 644 }
 645
 646 #define NRS_TBF_JOBID_BKT_BITS 10
 647
 648 static int
 649 nrs_tbf_jobid_startup(struct ptlrpc_nrs_policy *policy,
 650                       struct nrs_tbf_head *head)
 651 {
 652         struct nrs_tbf_cmd       start;
 653         struct nrs_tbf_bucket   *bkt;
 654         int                      bits;
 655         int                      i;
 656         int                      rc;
 657         struct cfs_hash_bd       bd;
 658
 659         bits = nrs_tbf_jobid_hash_order();
 660         if (bits < NRS_TBF_JOBID_BKT_BITS)
 661                 bits = NRS_TBF_JOBID_BKT_BITS;
 662         head->th_cli_hash = cfs_hash_create("nrs_tbf_hash",
 663                                             bits,
 664                                             bits,
 665                                             NRS_TBF_JOBID_BKT_BITS,
 666                                             sizeof(*bkt),
 667                                             0,
 668                                             0,
 669                                             &nrs_tbf_jobid_hash_ops,
 670                                             NRS_TBF_JOBID_HASH_FLAGS);
 671         if (head->th_cli_hash == NULL)
 672                 return -ENOMEM;
 673
 674         cfs_hash_for_each_bucket(head->th_cli_hash, &bd, i) {
 675                 bkt = cfs_hash_bd_extra_get(head->th_cli_hash, &bd);
 676                 INIT_LIST_HEAD(&bkt->ntb_lru);
 677         }
 678
 679         memset(&start, 0, sizeof(start));
 680         start.tc_jobids_str = "*";
 681
 682         start.tc_rpc_rate = tbf_rate;
 683         start.tc_rule_flags = NTRS_DEFAULT;
 684         start.tc_name = NRS_TBF_DEFAULT_RULE;
 685         INIT_LIST_HEAD(&start.tc_jobids);
 686         rc = nrs_tbf_rule_start(policy, head, &start);
 687
 688         return rc;
 689 }
 690
 691 /**
 692  * Frees jobid of \a list.
 693  *
 694  */
 695 static void
 696 nrs_tbf_jobid_list_free(struct list_head *jobid_list)
 697 {
 698         struct nrs_tbf_jobid *jobid, *n;
 699
 700         list_for_each_entry_safe(jobid, n, jobid_list, tj_linkage) {
 701                 OBD_FREE(jobid->tj_id, strlen(jobid->tj_id) + 1);
 702                 list_del(&jobid->tj_linkage);
 703                 OBD_FREE(jobid, sizeof(struct nrs_tbf_jobid));
 704         }
 705 }
 706
 707 static int
 708 nrs_tbf_jobid_list_add(const struct cfs_lstr *id, struct list_head *jobid_list)
 709 {
 710         struct nrs_tbf_jobid *jobid;
 711
 712         OBD_ALLOC(jobid, sizeof(struct nrs_tbf_jobid));
 713         if (jobid == NULL)
 714                 return -ENOMEM;
 715
 716         OBD_ALLOC(jobid->tj_id, id->ls_len + 1);
 717         if (jobid->tj_id == NULL) {
 718                 OBD_FREE(jobid, sizeof(struct nrs_tbf_jobid));
 719                 return -ENOMEM;
 720         }
 721
 722         memcpy(jobid->tj_id, id->ls_str, id->ls_len);
 723         list_add_tail(&jobid->tj_linkage, jobid_list);
 724         return 0;
 725 }
 726
 727 static int
 728 nrs_tbf_jobid_list_match(struct list_head *jobid_list, char *id)
 729 {
 730         struct nrs_tbf_jobid *jobid;
 731
 732         list_for_each_entry(jobid, jobid_list, tj_linkage) {
 733                 if (strcmp(id, jobid->tj_id) == 0)
 734                         return 1;
 735         }
 736         return 0;
 737 }
 738
 739 static int
 740 nrs_tbf_jobid_list_parse(char *str, int len, struct list_head *jobid_list)
 741 {
 742         struct cfs_lstr src;
 743         struct cfs_lstr res;
 744         int rc = 0;
 745         ENTRY;
 746
 747         src.ls_str = str;
 748         src.ls_len = len;
 749         INIT_LIST_HEAD(jobid_list);
 750         while (src.ls_str) {
 751                 rc = cfs_gettok(&src, ' ', &res);
 752                 if (rc == 0) {
 753                         rc = -EINVAL;
 754                         break;
 755                 }
 756                 rc = nrs_tbf_jobid_list_add(&res, jobid_list);
 757                 if (rc)
 758                         break;
 759         }
 760         if (rc)
 761                 nrs_tbf_jobid_list_free(jobid_list);
 762         RETURN(rc);
 763 }
 764
 765 static void nrs_tbf_jobid_cmd_fini(struct nrs_tbf_cmd *cmd)
 766 {
 767         if (!list_empty(&cmd->tc_jobids))
 768                 nrs_tbf_jobid_list_free(&cmd->tc_jobids);
 769         if (cmd->tc_jobids_str)
 770                 OBD_FREE(cmd->tc_jobids_str, strlen(cmd->tc_jobids_str) + 1);
 771 }
 772
 773 static int nrs_tbf_jobid_parse(struct nrs_tbf_cmd *cmd, const char *id)
 774 {
 775         int rc;
 776
 777         OBD_ALLOC(cmd->tc_jobids_str, strlen(id) + 1);
 778         if (cmd->tc_jobids_str == NULL)
 779                 return -ENOMEM;
 780
 781         memcpy(cmd->tc_jobids_str, id, strlen(id));
 782
 783         /* parse jobid list */
 784         rc = nrs_tbf_jobid_list_parse(cmd->tc_jobids_str,
 785                                       strlen(cmd->tc_jobids_str),
 786                                       &cmd->tc_jobids);
 787         if (rc)
 788                 nrs_tbf_jobid_cmd_fini(cmd);
 789
 790         return rc;
 791 }
 792
 793 static int nrs_tbf_jobid_rule_init(struct ptlrpc_nrs_policy *policy,
 794                                    struct nrs_tbf_rule *rule,
 795                                    struct nrs_tbf_cmd *start)
 796 {
 797         int rc = 0;
 798
 799         LASSERT(start->tc_jobids_str);
 800         OBD_ALLOC(rule->tr_jobids_str,
 801                   strlen(start->tc_jobids_str) + 1);
 802         if (rule->tr_jobids_str == NULL)
 803                 return -ENOMEM;
 804
 805         memcpy(rule->tr_jobids_str,
 806                start->tc_jobids_str,
 807                strlen(start->tc_jobids_str));
 808
 809         INIT_LIST_HEAD(&rule->tr_jobids);
 810         if (!list_empty(&start->tc_jobids)) {
 811                 rc = nrs_tbf_jobid_list_parse(rule->tr_jobids_str,
 812                                               strlen(rule->tr_jobids_str),
 813                                               &rule->tr_jobids);
 814                 if (rc)
 815                         CERROR("jobids {%s} illegal\n", rule->tr_jobids_str);
 816         }
 817         if (rc)
 818                 OBD_FREE(rule->tr_jobids_str,
 819                          strlen(start->tc_jobids_str) + 1);
 820         return rc;
 821 }
 822
 823 static int
 824 nrs_tbf_jobid_rule_dump(struct nrs_tbf_rule *rule, struct seq_file *m)
 825 {
 826         return seq_printf(m, "%s {%s} %llu, ref %d\n", rule->tr_name,
 827                           rule->tr_jobids_str, rule->tr_rpc_rate,
 828                           atomic_read(&rule->tr_ref) - 1);
 829 }
 830
 831 static int
 832 nrs_tbf_jobid_rule_match(struct nrs_tbf_rule *rule,
 833                          struct nrs_tbf_client *cli)
 834 {
 835         return nrs_tbf_jobid_list_match(&rule->tr_jobids, cli->tc_jobid);
 836 }
 837
 838 static void nrs_tbf_jobid_rule_fini(struct nrs_tbf_rule *rule)
 839 {
 840         if (!list_empty(&rule->tr_jobids))
 841                 nrs_tbf_jobid_list_free(&rule->tr_jobids);
 842         LASSERT(rule->tr_jobids_str != NULL);
 843         OBD_FREE(rule->tr_jobids_str, strlen(rule->tr_jobids_str) + 1);
 844 }
 845
 846 static struct nrs_tbf_ops nrs_tbf_jobid_ops = {
 847         .o_name = NRS_TBF_TYPE_JOBID,
 848         .o_startup = nrs_tbf_jobid_startup,
 849         .o_cli_find = nrs_tbf_jobid_cli_find,
 850         .o_cli_findadd = nrs_tbf_jobid_cli_findadd,
 851         .o_cli_put = nrs_tbf_jobid_cli_put,
 852         .o_cli_init = nrs_tbf_jobid_cli_init,
 853         .o_rule_init = nrs_tbf_jobid_rule_init,
 854         .o_rule_dump = nrs_tbf_jobid_rule_dump,
 855         .o_rule_match = nrs_tbf_jobid_rule_match,
 856         .o_rule_fini = nrs_tbf_jobid_rule_fini,
 857 };
 858
 859 /**
 860  * libcfs_hash operations for nrs_tbf_net::cn_cli_hash
 861  *
 862  * This uses ptlrpc_request::rq_peer.nid as its key, in order to hash
 863  * nrs_tbf_client objects.
 864  */
 865 #define NRS_TBF_NID_BKT_BITS    8
 866 #define NRS_TBF_NID_BITS        16
 867
 868 static unsigned nrs_tbf_nid_hop_hash(struct cfs_hash *hs, const void *key,
 869                                   unsigned mask)
 870 {
 871         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
 872 }
 873
 874 static int nrs_tbf_nid_hop_keycmp(const void *key, struct hlist_node *hnode)
 875 {
 876         lnet_nid_t            *nid = (lnet_nid_t *)key;
 877         struct nrs_tbf_client *cli = hlist_entry(hnode,
 878                                                      struct nrs_tbf_client,
 879                                                      tc_hnode);
 880
 881         return *nid == cli->tc_nid;
 882 }
 883
 884 static void *nrs_tbf_nid_hop_key(struct hlist_node *hnode)
 885 {
 886         struct nrs_tbf_client *cli = hlist_entry(hnode,
 887                                                      struct nrs_tbf_client,
 888                                                      tc_hnode);
 889
 890         return &cli->tc_nid;
 891 }
 892
 893 static void *nrs_tbf_nid_hop_object(struct hlist_node *hnode)
 894 {
 895         return hlist_entry(hnode, struct nrs_tbf_client, tc_hnode);
 896 }
 897
 898 static void nrs_tbf_nid_hop_get(struct cfs_hash *hs, struct hlist_node *hnode)
 899 {
 900         struct nrs_tbf_client *cli = hlist_entry(hnode,
 901                                                      struct nrs_tbf_client,
 902                                                      tc_hnode);
 903
 904         atomic_inc(&cli->tc_ref);
 905 }
 906
 907 static void nrs_tbf_nid_hop_put(struct cfs_hash *hs, struct hlist_node *hnode)
 908 {
 909         struct nrs_tbf_client *cli = hlist_entry(hnode,
 910                                                      struct nrs_tbf_client,
 911                                                      tc_hnode);
 912
 913         atomic_dec(&cli->tc_ref);
 914 }
 915
 916 static void nrs_tbf_nid_hop_exit(struct cfs_hash *hs, struct hlist_node *hnode)
 917 {
 918         struct nrs_tbf_client *cli = hlist_entry(hnode,
 919                                                      struct nrs_tbf_client,
 920                                                      tc_hnode);
 921
 922         LASSERTF(atomic_read(&cli->tc_ref) == 0,
 923                  "Busy TBF object from client with NID %s, with %d refs\n",
 924                  libcfs_nid2str(cli->tc_nid), atomic_read(&cli->tc_ref));
 925
 926         nrs_tbf_cli_fini(cli);
 927 }
 928
 929 static struct cfs_hash_ops nrs_tbf_nid_hash_ops = {
 930         .hs_hash        = nrs_tbf_nid_hop_hash,
 931         .hs_keycmp      = nrs_tbf_nid_hop_keycmp,
 932         .hs_key         = nrs_tbf_nid_hop_key,
 933         .hs_object      = nrs_tbf_nid_hop_object,
 934         .hs_get         = nrs_tbf_nid_hop_get,
 935         .hs_put         = nrs_tbf_nid_hop_put,
 936         .hs_put_locked  = nrs_tbf_nid_hop_put,
 937         .hs_exit        = nrs_tbf_nid_hop_exit,
 938 };
 939
 940 static struct nrs_tbf_client *
 941 nrs_tbf_nid_cli_find(struct nrs_tbf_head *head,
 942                      struct ptlrpc_request *req)
 943 {
 944         return cfs_hash_lookup(head->th_cli_hash, &req->rq_peer.nid);
 945 }
 946
 947 static struct nrs_tbf_client *
 948 nrs_tbf_nid_cli_findadd(struct nrs_tbf_head *head,
 949                         struct nrs_tbf_client *cli)
 950 {
 951         return cfs_hash_findadd_unique(head->th_cli_hash, &cli->tc_nid,
 952                                        &cli->tc_hnode);
 953 }
 954
 955 static void
 956 nrs_tbf_nid_cli_put(struct nrs_tbf_head *head,
 957                       struct nrs_tbf_client *cli)
 958 {
 959         cfs_hash_put(head->th_cli_hash, &cli->tc_hnode);
 960 }
 961
 962 static int
 963 nrs_tbf_nid_startup(struct ptlrpc_nrs_policy *policy,
 964                     struct nrs_tbf_head *head)
 965 {
 966         struct nrs_tbf_cmd      start;
 967         int rc;
 968
 969         head->th_cli_hash = cfs_hash_create("nrs_tbf_hash",
 970                                             NRS_TBF_NID_BITS,
 971                                             NRS_TBF_NID_BITS,
 972                                             NRS_TBF_NID_BKT_BITS, 0,
 973                                             CFS_HASH_MIN_THETA,
 974                                             CFS_HASH_MAX_THETA,
 975                                             &nrs_tbf_nid_hash_ops,
 976                                             CFS_HASH_RW_BKTLOCK);
 977         if (head->th_cli_hash == NULL)
 978                 return -ENOMEM;
 979
 980         memset(&start, 0, sizeof(start));
 981         start.tc_nids_str = "*";
 982
 983         start.tc_rpc_rate = tbf_rate;
 984         start.tc_rule_flags = NTRS_DEFAULT;
 985         start.tc_name = NRS_TBF_DEFAULT_RULE;
 986         INIT_LIST_HEAD(&start.tc_nids);
 987         rc = nrs_tbf_rule_start(policy, head, &start);
 988
 989         return rc;
 990 }
 991
 992 static void
 993 nrs_tbf_nid_cli_init(struct nrs_tbf_client *cli,
 994                              struct ptlrpc_request *req)
 995 {
 996         cli->tc_nid = req->rq_peer.nid;
 997 }
 998
 999 static int nrs_tbf_nid_rule_init(struct ptlrpc_nrs_policy *policy,
1000                                  struct nrs_tbf_rule *rule,
1001                                  struct nrs_tbf_cmd *start)
1002 {
1003         LASSERT(start->tc_nids_str);
1004         OBD_ALLOC(rule->tr_nids_str,
1005                   strlen(start->tc_nids_str) + 1);
1006         if (rule->tr_nids_str == NULL)
1007                 return -ENOMEM;
1008
1009         memcpy(rule->tr_nids_str,
1010                start->tc_nids_str,
1011                strlen(start->tc_nids_str));
1012
1013         INIT_LIST_HEAD(&rule->tr_nids);
1014         if (!list_empty(&start->tc_nids)) {
1015                 if (cfs_parse_nidlist(rule->tr_nids_str,
1016                                       strlen(rule->tr_nids_str),
1017                                       &rule->tr_nids) <= 0) {
1018                         CERROR("nids {%s} illegal\n",
1019                                rule->tr_nids_str);
1020                         OBD_FREE(rule->tr_nids_str,
1021                                  strlen(start->tc_nids_str) + 1);
1022                         return -EINVAL;
1023                 }
1024         }
1025         return 0;
1026 }
1027
1028 static int
1029 nrs_tbf_nid_rule_dump(struct nrs_tbf_rule *rule, struct seq_file *m)
1030 {
1031         return seq_printf(m, "%s {%s} %llu, ref %d\n", rule->tr_name,
1032                           rule->tr_nids_str, rule->tr_rpc_rate,
1033                           atomic_read(&rule->tr_ref) - 1);
1034 }
1035
1036 static int
1037 nrs_tbf_nid_rule_match(struct nrs_tbf_rule *rule,
1038                        struct nrs_tbf_client *cli)
1039 {
1040         return cfs_match_nid(cli->tc_nid, &rule->tr_nids);
1041 }
1042
1043 static void nrs_tbf_nid_rule_fini(struct nrs_tbf_rule *rule)
1044 {
1045         if (!list_empty(&rule->tr_nids))
1046                 cfs_free_nidlist(&rule->tr_nids);
1047         LASSERT(rule->tr_nids_str != NULL);
1048         OBD_FREE(rule->tr_nids_str, strlen(rule->tr_nids_str) + 1);
1049 }
1050
1051 static void nrs_tbf_nid_cmd_fini(struct nrs_tbf_cmd *cmd)
1052 {
1053         if (!list_empty(&cmd->tc_nids))
1054                 cfs_free_nidlist(&cmd->tc_nids);
1055         if (cmd->tc_nids_str)
1056                 OBD_FREE(cmd->tc_nids_str, strlen(cmd->tc_nids_str) + 1);
1057 }
1058
1059 static int nrs_tbf_nid_parse(struct nrs_tbf_cmd *cmd, const char *id)
1060 {
1061         OBD_ALLOC(cmd->tc_nids_str, strlen(id) + 1);
1062         if (cmd->tc_nids_str == NULL)
1063                 return -ENOMEM;
1064
1065         memcpy(cmd->tc_nids_str, id, strlen(id));
1066
1067         /* parse NID list */
1068         if (cfs_parse_nidlist(cmd->tc_nids_str,
1069                               strlen(cmd->tc_nids_str),
1070                               &cmd->tc_nids) <= 0) {
1071                 nrs_tbf_nid_cmd_fini(cmd);
1072                 return -EINVAL;
1073         }
1074
1075         return 0;
1076 }
1077
1078 static struct nrs_tbf_ops nrs_tbf_nid_ops = {
1079         .o_name = NRS_TBF_TYPE_NID,
1080         .o_startup = nrs_tbf_nid_startup,
1081         .o_cli_find = nrs_tbf_nid_cli_find,
1082         .o_cli_findadd = nrs_tbf_nid_cli_findadd,
1083         .o_cli_put = nrs_tbf_nid_cli_put,
1084         .o_cli_init = nrs_tbf_nid_cli_init,
1085         .o_rule_init = nrs_tbf_nid_rule_init,
1086         .o_rule_dump = nrs_tbf_nid_rule_dump,
1087         .o_rule_match = nrs_tbf_nid_rule_match,
1088         .o_rule_fini = nrs_tbf_nid_rule_fini,
1089 };
1090
1091 /**
1092  * Is called before the policy transitions into
1093  * ptlrpc_nrs_pol_state::NRS_POL_STATE_STARTED; allocates and initializes a
1094  * policy-specific private data structure.
1095  *
1096  * \param[in] policy The policy to start
1097  *
1098  * \retval -ENOMEM OOM error
1099  * \retval  0      success
1100  *
1101  * \see nrs_policy_register()
1102  * \see nrs_policy_ctl()
1103  */
1104 static int nrs_tbf_start(struct ptlrpc_nrs_policy *policy, char *arg)
1105 {
1106         struct nrs_tbf_head     *head;
1107         struct nrs_tbf_ops      *ops;
1108         __u32                    type;
1109         int rc = 0;
1110
1111         if (arg == NULL || strlen(arg) > NRS_TBF_TYPE_MAX_LEN)
1112                 GOTO(out, rc = -EINVAL);
1113
1114         if (strcmp(arg, NRS_TBF_TYPE_NID) == 0) {
1115                 ops = &nrs_tbf_nid_ops;
1116                 type = NRS_TBF_FLAG_NID;
1117         } else if (strcmp(arg, NRS_TBF_TYPE_JOBID) == 0) {
1118                 ops = &nrs_tbf_jobid_ops;
1119                 type = NRS_TBF_FLAG_JOBID;
1120         } else
1121                 GOTO(out, rc = -ENOTSUPP);
1122
1123         OBD_CPT_ALLOC_PTR(head, nrs_pol2cptab(policy), nrs_pol2cptid(policy));
1124         if (head == NULL)
1125                 GOTO(out, rc = -ENOMEM);
1126
1127         memcpy(head->th_type, arg, strlen(arg));
1128         head->th_type[strlen(arg)] = '\0';
1129         head->th_ops = ops;
1130         head->th_type_flag = type;
1131
1132         head->th_binheap = cfs_binheap_create(&nrs_tbf_heap_ops,
1133                                               CBH_FLAG_ATOMIC_GROW, 4096, NULL,
1134                                               nrs_pol2cptab(policy),
1135                                               nrs_pol2cptid(policy));
1136         if (head->th_binheap == NULL)
1137                 GOTO(out_free_head, rc = -ENOMEM);
1138
1139         atomic_set(&head->th_rule_sequence, 0);
1140         spin_lock_init(&head->th_rule_lock);
1141         INIT_LIST_HEAD(&head->th_list);
1142         hrtimer_init(&head->th_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1143         head->th_timer.function = nrs_tbf_timer_cb;
1144         rc = head->th_ops->o_startup(policy, head);
1145         if (rc)
1146                 GOTO(out_free_heap, rc);
1147
1148         policy->pol_private = head;
1149         return 0;
1150 out_free_heap:
1151         cfs_binheap_destroy(head->th_binheap);
1152 out_free_head:
1153         OBD_FREE_PTR(head);
1154 out:
1155         return rc;
1156 }
1157
1158 /**
1159  * Is called before the policy transitions into
1160  * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED; deallocates the policy-specific
1161  * private data structure.
1162  *
1163  * \param[in] policy The policy to stop
1164  *
1165  * \see nrs_policy_stop0()
1166  */
1167 static void nrs_tbf_stop(struct ptlrpc_nrs_policy *policy)
1168 {
1169         struct nrs_tbf_head *head = policy->pol_private;
1170         struct ptlrpc_nrs *nrs = policy->pol_nrs;
1171         struct nrs_tbf_rule *rule, *n;
1172
1173         LASSERT(head != NULL);
1174         LASSERT(head->th_cli_hash != NULL);
1175         hrtimer_cancel(&head->th_timer);
1176         /* Should cleanup hash first before free rules */
1177         cfs_hash_putref(head->th_cli_hash);
1178         list_for_each_entry_safe(rule, n, &head->th_list, tr_linkage) {
1179                 list_del_init(&rule->tr_linkage);
1180                 nrs_tbf_rule_put(rule);
1181         }
1182         LASSERT(list_empty(&head->th_list));
1183         LASSERT(head->th_binheap != NULL);
1184         LASSERT(cfs_binheap_is_empty(head->th_binheap));
1185         cfs_binheap_destroy(head->th_binheap);
1186         OBD_FREE_PTR(head);
1187         spin_lock(&nrs->nrs_lock);
1188         nrs->nrs_throttling = 0;
1189         spin_unlock(&nrs->nrs_lock);
1190         wake_up(&policy->pol_nrs->nrs_svcpt->scp_waitq);
1191 }
1192
1193 /**
1194  * Performs a policy-specific ctl function on TBF policy instances; similar
1195  * to ioctl.
1196  *
1197  * \param[in]     policy the policy instance
1198  * \param[in]     opc    the opcode
1199  * \param[in,out] arg    used for passing parameters and information
1200  *
1201  * \pre assert_spin_locked(&policy->pol_nrs->->nrs_lock)
1202  * \post assert_spin_locked(&policy->pol_nrs->->nrs_lock)
1203  *
1204  * \retval 0   operation carried out successfully
1205  * \retval -ve error
1206  */
1207 static int nrs_tbf_ctl(struct ptlrpc_nrs_policy *policy,
1208                        enum ptlrpc_nrs_ctl opc,
1209                        void *arg)
1210 {
1211         int rc = 0;
1212         ENTRY;
1213
1214         assert_spin_locked(&policy->pol_nrs->nrs_lock);
1215
1216         switch ((enum nrs_ctl_tbf)opc) {
1217         default:
1218                 RETURN(-EINVAL);
1219
1220         /**
1221          * Read RPC rate size of a policy instance.
1222          */
1223         case NRS_CTL_TBF_RD_RULE: {
1224                 struct nrs_tbf_head *head = policy->pol_private;
1225                 struct seq_file *m = (struct seq_file *) arg;
1226                 struct ptlrpc_service_part *svcpt;
1227
1228                 svcpt = policy->pol_nrs->nrs_svcpt;
1229                 seq_printf(m, "CPT %d:\n", svcpt->scp_cpt);
1230
1231                 rc = nrs_tbf_rule_dump_all(head, m);
1232                 }
1233                 break;
1234
1235         /**
1236          * Write RPC rate of a policy instance.
1237          */
1238         case NRS_CTL_TBF_WR_RULE: {
1239                 struct nrs_tbf_head *head = policy->pol_private;
1240                 struct nrs_tbf_cmd *cmd;
1241
1242                 cmd = (struct nrs_tbf_cmd *)arg;
1243                 rc = nrs_tbf_command(policy,
1244                                      head,
1245                                      cmd);
1246                 }
1247                 break;
1248         }
1249
1250         RETURN(rc);
1251 }
1252
1253 /**
1254  * Is called for obtaining a TBF policy resource.
1255  *
1256  * \param[in]  policy     The policy on which the request is being asked for
1257  * \param[in]  nrq        The request for which resources are being taken
1258  * \param[in]  parent     Parent resource, unused in this policy
1259  * \param[out] resp       Resources references are placed in this array
1260  * \param[in]  moving_req Signifies limited caller context; unused in this
1261  *                        policy
1262  *
1263  *
1264  * \see nrs_resource_get_safe()
1265  */
1266 static int nrs_tbf_res_get(struct ptlrpc_nrs_policy *policy,
1267                            struct ptlrpc_nrs_request *nrq,
1268                            const struct ptlrpc_nrs_resource *parent,
1269                            struct ptlrpc_nrs_resource **resp,
1270                            bool moving_req)
1271 {
1272         struct nrs_tbf_head   *head;
1273         struct nrs_tbf_client *cli;
1274         struct nrs_tbf_client *tmp;
1275         struct ptlrpc_request *req;
1276
1277         if (parent == NULL) {
1278                 *resp = &((struct nrs_tbf_head *)policy->pol_private)->th_res;
1279                 return 0;
1280         }
1281
1282         head = container_of(parent, struct nrs_tbf_head, th_res);
1283         req = container_of(nrq, struct ptlrpc_request, rq_nrq);
1284         cli = head->th_ops->o_cli_find(head, req);
1285         if (cli != NULL) {
1286                 spin_lock(&policy->pol_nrs->nrs_svcpt->scp_req_lock);
1287                 LASSERT(cli->tc_rule);
1288                 if (cli->tc_rule_sequence !=
1289                     atomic_read(&head->th_rule_sequence) ||
1290                     cli->tc_rule->tr_flags & NTRS_STOPPING) {
1291                         struct nrs_tbf_rule *rule;
1292
1293                         rule = nrs_tbf_rule_match(head, cli);
1294                         if (rule != cli->tc_rule)
1295                                 nrs_tbf_cli_reset(head, rule, cli);
1296                         else
1297                                 nrs_tbf_rule_put(rule);
1298                 } else if (cli->tc_rule_generation !=
1299                            cli->tc_rule->tr_generation) {
1300                         nrs_tbf_cli_reset_value(head, cli);
1301                 }
1302                 spin_unlock(&policy->pol_nrs->nrs_svcpt->scp_req_lock);
1303                 goto out;
1304         }
1305
1306         OBD_CPT_ALLOC_GFP(cli, nrs_pol2cptab(policy), nrs_pol2cptid(policy),
1307                           sizeof(*cli), moving_req ? GFP_ATOMIC : __GFP_IO);
1308         if (cli == NULL)
1309                 return -ENOMEM;
1310         nrs_tbf_cli_init(head, cli, req);
1311         tmp = head->th_ops->o_cli_findadd(head, cli);
1312         if (tmp != cli) {
1313                 atomic_dec(&cli->tc_ref);
1314                 nrs_tbf_cli_fini(cli);
1315                 cli = tmp;
1316         }
1317 out:
1318         *resp = &cli->tc_res;
1319
1320         return 1;
1321 }
1322
1323 /**
1324  * Called when releasing references to the resource hierachy obtained for a
1325  * request for scheduling using the TBF policy.
1326  *
1327  * \param[in] policy   the policy the resource belongs to
1328  * \param[in] res      the resource to be released
1329  */
1330 static void nrs_tbf_res_put(struct ptlrpc_nrs_policy *policy,
1331                             const struct ptlrpc_nrs_resource *res)
1332 {
1333         struct nrs_tbf_head   *head;
1334         struct nrs_tbf_client *cli;
1335
1336         /**
1337          * Do nothing for freeing parent, nrs_tbf_net resources
1338          */
1339         if (res->res_parent == NULL)
1340                 return;
1341
1342         cli = container_of(res, struct nrs_tbf_client, tc_res);
1343         head = container_of(res->res_parent, struct nrs_tbf_head, th_res);
1344
1345         head->th_ops->o_cli_put(head, cli);
1346 }
1347
1348 /**
1349  * Called when getting a request from the TBF policy for handling, or just
1350  * peeking; removes the request from the policy when it is to be handled.
1351  *
1352  * \param[in] policy The policy
1353  * \param[in] peek   When set, signifies that we just want to examine the
1354  *                   request, and not handle it, so the request is not removed
1355  *                   from the policy.
1356  * \param[in] force  Force the policy to return a request; unused in this
1357  *                   policy
1358  *
1359  * \retval The request to be handled; this is the next request in the TBF
1360  *         rule
1361  *
1362  * \see ptlrpc_nrs_req_get_nolock()
1363  * \see nrs_request_get()
1364  */
1365 static
1366 struct ptlrpc_nrs_request *nrs_tbf_req_get(struct ptlrpc_nrs_policy *policy,
1367                                            bool peek, bool force)
1368 {
1369         struct nrs_tbf_head       *head = policy->pol_private;
1370         struct ptlrpc_nrs_request *nrq = NULL;
1371         struct nrs_tbf_client     *cli;
1372         cfs_binheap_node_t        *node;
1373
1374         assert_spin_locked(&policy->pol_nrs->nrs_svcpt->scp_req_lock);
1375
1376         if (!peek && policy->pol_nrs->nrs_throttling)
1377                 return NULL;
1378
1379         node = cfs_binheap_root(head->th_binheap);
1380         if (unlikely(node == NULL))
1381                 return NULL;
1382
1383         cli = container_of(node, struct nrs_tbf_client, tc_node);
1384         LASSERT(cli->tc_in_heap);
1385         if (peek) {
1386                 nrq = list_entry(cli->tc_list.next,
1387                                      struct ptlrpc_nrs_request,
1388                                      nr_u.tbf.tr_list);
1389         } else {
1390                 __u64 now = ktime_to_ns(ktime_get());
1391                 __u64 passed;
1392                 long  ntoken;
1393                 __u64 deadline;
1394
1395                 deadline = cli->tc_check_time +
1396                           cli->tc_nsecs;
1397                 LASSERT(now >= cli->tc_check_time);
1398                 passed = now - cli->tc_check_time;
1399                 ntoken = (passed * cli->tc_rpc_rate) / NSEC_PER_SEC;
1400                 ntoken += cli->tc_ntoken;
1401                 if (ntoken > cli->tc_depth)
1402                         ntoken = cli->tc_depth;
1403                 if (ntoken > 0) {
1404                         struct ptlrpc_request *req;
1405                         nrq = list_entry(cli->tc_list.next,
1406                                              struct ptlrpc_nrs_request,
1407                                              nr_u.tbf.tr_list);
1408                         req = container_of(nrq,
1409                                            struct ptlrpc_request,
1410                                            rq_nrq);
1411                         ntoken--;
1412                         cli->tc_ntoken = ntoken;
1413                         cli->tc_check_time = now;
1414                         list_del_init(&nrq->nr_u.tbf.tr_list);
1415                         if (list_empty(&cli->tc_list)) {
1416                                 cfs_binheap_remove(head->th_binheap,
1417                                                    &cli->tc_node);
1418                                 cli->tc_in_heap = false;
1419                         } else {
1420                                 cfs_binheap_relocate(head->th_binheap,
1421                                                      &cli->tc_node);
1422                         }
1423                         CDEBUG(D_RPCTRACE,
1424                                "NRS start %s request from %s, "
1425                                "seq: "LPU64"\n",
1426                                policy->pol_desc->pd_name,
1427                                libcfs_id2str(req->rq_peer),
1428                                nrq->nr_u.tbf.tr_sequence);
1429                 } else {
1430                         ktime_t time;
1431
1432                         spin_lock(&policy->pol_nrs->nrs_lock);
1433                         policy->pol_nrs->nrs_throttling = 1;
1434                         spin_unlock(&policy->pol_nrs->nrs_lock);
1435                         head->th_deadline = deadline;
1436                         time = ktime_set(0, 0);
1437                         time = ktime_add_ns(time, deadline);
1438                         hrtimer_start(&head->th_timer, time, HRTIMER_MODE_ABS);
1439                 }
1440         }
1441
1442         return nrq;
1443 }
1444
1445 /**
1446  * Adds request \a nrq to \a policy's list of queued requests
1447  *
1448  * \param[in] policy The policy
1449  * \param[in] nrq    The request to add
1450  *
1451  * \retval 0 success; nrs_request_enqueue() assumes this function will always
1452  *                    succeed
1453  */
1454 static int nrs_tbf_req_add(struct ptlrpc_nrs_policy *policy,
1455                            struct ptlrpc_nrs_request *nrq)
1456 {
1457         struct nrs_tbf_head   *head;
1458         struct nrs_tbf_client *cli;
1459         int                    rc = 0;
1460
1461         assert_spin_locked(&policy->pol_nrs->nrs_svcpt->scp_req_lock);
1462
1463         cli = container_of(nrs_request_resource(nrq),
1464                            struct nrs_tbf_client, tc_res);
1465         head = container_of(nrs_request_resource(nrq)->res_parent,
1466                             struct nrs_tbf_head, th_res);
1467         if (list_empty(&cli->tc_list)) {
1468                 LASSERT(!cli->tc_in_heap);
1469                 rc = cfs_binheap_insert(head->th_binheap, &cli->tc_node);
1470                 if (rc == 0) {
1471                         cli->tc_in_heap = true;
1472                         nrq->nr_u.tbf.tr_sequence = head->th_sequence++;
1473                         list_add_tail(&nrq->nr_u.tbf.tr_list,
1474                                           &cli->tc_list);
1475                         if (policy->pol_nrs->nrs_throttling) {
1476                                 __u64 deadline = cli->tc_check_time +
1477                                                  cli->tc_nsecs;
1478                                 if ((head->th_deadline > deadline) &&
1479                                     (hrtimer_try_to_cancel(&head->th_timer)
1480                                      >= 0)) {
1481                                         ktime_t time;
1482                                         head->th_deadline = deadline;
1483                                         time = ktime_set(0, 0);
1484                                         time = ktime_add_ns(time, deadline);
1485                                         hrtimer_start(&head->th_timer, time,
1486                                                       HRTIMER_MODE_ABS);
1487                                 }
1488                         }
1489                 }
1490         } else {
1491                 LASSERT(cli->tc_in_heap);
1492                 nrq->nr_u.tbf.tr_sequence = head->th_sequence++;
1493                 list_add_tail(&nrq->nr_u.tbf.tr_list,
1494                                   &cli->tc_list);
1495         }
1496         return rc;
1497 }
1498
1499 /**
1500  * Removes request \a nrq from \a policy's list of queued requests.
1501  *
1502  * \param[in] policy The policy
1503  * \param[in] nrq    The request to remove
1504  */
1505 static void nrs_tbf_req_del(struct ptlrpc_nrs_policy *policy,
1506                              struct ptlrpc_nrs_request *nrq)
1507 {
1508         struct nrs_tbf_head   *head;
1509         struct nrs_tbf_client *cli;
1510
1511         assert_spin_locked(&policy->pol_nrs->nrs_svcpt->scp_req_lock);
1512
1513         cli = container_of(nrs_request_resource(nrq),
1514                            struct nrs_tbf_client, tc_res);
1515         head = container_of(nrs_request_resource(nrq)->res_parent,
1516                             struct nrs_tbf_head, th_res);
1517
1518         LASSERT(!list_empty(&nrq->nr_u.tbf.tr_list));
1519         list_del_init(&nrq->nr_u.tbf.tr_list);
1520         if (list_empty(&cli->tc_list)) {
1521                 cfs_binheap_remove(head->th_binheap,
1522                                    &cli->tc_node);
1523                 cli->tc_in_heap = false;
1524         } else {
1525                 cfs_binheap_relocate(head->th_binheap,
1526                                      &cli->tc_node);
1527         }
1528 }
1529
1530 /**
1531  * Prints a debug statement right before the request \a nrq stops being
1532  * handled.
1533  *
1534  * \param[in] policy The policy handling the request
1535  * \param[in] nrq    The request being handled
1536  *
1537  * \see ptlrpc_server_finish_request()
1538  * \see ptlrpc_nrs_req_stop_nolock()
1539  */
1540 static void nrs_tbf_req_stop(struct ptlrpc_nrs_policy *policy,
1541                               struct ptlrpc_nrs_request *nrq)
1542 {
1543         struct ptlrpc_request *req = container_of(nrq, struct ptlrpc_request,
1544                                                   rq_nrq);
1545
1546         assert_spin_locked(&policy->pol_nrs->nrs_svcpt->scp_req_lock);
1547
1548         CDEBUG(D_RPCTRACE, "NRS stop %s request from %s, seq: "LPU64"\n",
1549                policy->pol_desc->pd_name, libcfs_id2str(req->rq_peer),
1550                nrq->nr_u.tbf.tr_sequence);
1551 }
1552
1553 #ifdef CONFIG_PROC_FS
1554
1555 /**
1556  * lprocfs interface
1557  */
1558
1559 /**
1560  * The maximum RPC rate.
1561  */
1562 #define LPROCFS_NRS_RATE_MAX            65535
1563
1564 static int
1565 ptlrpc_lprocfs_nrs_tbf_rule_seq_show(struct seq_file *m, void *data)
1566 {
1567         struct ptlrpc_service       *svc = m->private;
1568         int                          rc;
1569
1570         seq_printf(m, "regular_requests:\n");
1571         /**
1572          * Perform two separate calls to this as only one of the NRS heads'
1573          * policies may be in the ptlrpc_nrs_pol_state::NRS_POL_STATE_STARTED or
1574          * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPING state.
1575          */
1576         rc = ptlrpc_nrs_policy_control(svc, PTLRPC_NRS_QUEUE_REG,
1577                                        NRS_POL_NAME_TBF,
1578                                        NRS_CTL_TBF_RD_RULE,
1579                                        false, m);
1580         if (rc == 0) {
1581                 /**
1582                  * -ENOSPC means buf in the parameter m is overflow, return 0
1583                  * here to let upper layer function seq_read alloc a larger
1584                  * memory area and do this process again.
1585                  */
1586         } else if (rc == -ENOSPC) {
1587                 return 0;
1588
1589                 /**
1590                  * Ignore -ENODEV as the regular NRS head's policy may be in the
1591                  * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED state.
1592                  */
1593         } else if (rc != -ENODEV) {
1594                 return rc;
1595         }
1596
1597         if (!nrs_svc_has_hp(svc))
1598                 goto no_hp;
1599
1600         seq_printf(m, "high_priority_requests:\n");
1601         rc = ptlrpc_nrs_policy_control(svc, PTLRPC_NRS_QUEUE_HP,
1602                                        NRS_POL_NAME_TBF,
1603                                        NRS_CTL_TBF_RD_RULE,
1604                                        false, m);
1605         if (rc == 0) {
1606                 /**
1607                  * -ENOSPC means buf in the parameter m is overflow, return 0
1608                  * here to let upper layer function seq_read alloc a larger
1609                  * memory area and do this process again.
1610                  */
1611         } else if (rc == -ENOSPC) {
1612                 return 0;
1613         }
1614
1615 no_hp:
1616
1617         return rc;
1618 }
1619
1620 static int nrs_tbf_id_parse(struct nrs_tbf_cmd *cmd, char **val)
1621 {
1622         int rc;
1623         char *token;
1624
1625         token = strsep(val, "}");
1626         if (*val == NULL)
1627                 GOTO(out, rc = -EINVAL);
1628
1629         if (strlen(token) <= 1 ||
1630             token[0] != '{')
1631                 GOTO(out, rc = -EINVAL);
1632         /* Skip '{' */
1633         token++;
1634
1635         /* Should be followed by ' ' or nothing */
1636         if ((*val)[0] == '\0')
1637                 *val = NULL;
1638         else if ((*val)[0] == ' ')
1639                 (*val)++;
1640         else
1641                 GOTO(out, rc = -EINVAL);
1642
1643         rc = nrs_tbf_jobid_parse(cmd, token);
1644         if (!rc)
1645                 cmd->tc_valid_types |= NRS_TBF_FLAG_JOBID;
1646
1647         rc = nrs_tbf_nid_parse(cmd, token);
1648         if (!rc)
1649                 cmd->tc_valid_types |= NRS_TBF_FLAG_NID;
1650
1651         if (!cmd->tc_valid_types)
1652                 rc = -EINVAL;
1653         else
1654                 rc = 0;
1655 out:
1656         return rc;
1657 }
1658
1659
1660 static void nrs_tbf_cmd_fini(struct nrs_tbf_cmd *cmd)
1661 {
1662         if (cmd->tc_valid_types & NRS_TBF_FLAG_JOBID)
1663                 nrs_tbf_jobid_cmd_fini(cmd);
1664         if (cmd->tc_valid_types & NRS_TBF_FLAG_NID)
1665                 nrs_tbf_nid_cmd_fini(cmd);
1666 }
1667
1668 static struct nrs_tbf_cmd *
1669 nrs_tbf_parse_cmd(char *buffer, unsigned long count)
1670 {
1671         static struct nrs_tbf_cmd *cmd;
1672         char                      *token;
1673         char                      *val;
1674         int                        i;
1675         int                        rc = 0;
1676
1677         OBD_ALLOC_PTR(cmd);
1678         if (cmd == NULL)
1679                 GOTO(out, rc = -ENOMEM);
1680
1681         val = buffer;
1682         token = strsep(&val, " ");
1683         if (val == NULL || strlen(val) == 0)
1684                 GOTO(out_free_cmd, rc = -EINVAL);
1685
1686         /* Type of the command */
1687         if (strcmp(token, "start") == 0)
1688                 cmd->tc_cmd = NRS_CTL_TBF_START_RULE;
1689         else if (strcmp(token, "stop") == 0)
1690                 cmd->tc_cmd = NRS_CTL_TBF_STOP_RULE;
1691         else if (strcmp(token, "change") == 0)
1692                 cmd->tc_cmd = NRS_CTL_TBF_CHANGE_RATE;
1693         else
1694                 GOTO(out_free_cmd, rc = -EINVAL);
1695
1696         /* Name of the rule */
1697         token = strsep(&val, " ");
1698         if (val == NULL) {
1699                 /**
1700                  * Stop comand only need name argument,
1701                  * But other commands need ID or rate argument.
1702                  */
1703                 if (cmd->tc_cmd != NRS_CTL_TBF_STOP_RULE)
1704                         GOTO(out_free_cmd, rc = -EINVAL);
1705         }
1706
1707         for (i = 0; i < strlen(token); i++) {
1708                 if ((!isalnum(token[i])) &&
1709                     (token[i] != '_'))
1710                         GOTO(out_free_cmd, rc = -EINVAL);
1711         }
1712         cmd->tc_name = token;
1713
1714         if (cmd->tc_cmd == NRS_CTL_TBF_START_RULE) {
1715                 /* List of ID */
1716                 LASSERT(val);
1717                 rc = nrs_tbf_id_parse(cmd, &val);
1718                 if (rc)
1719                         GOTO(out_free_cmd, rc);
1720         }
1721
1722         if (val != NULL) {
1723                 if (cmd->tc_cmd == NRS_CTL_TBF_STOP_RULE ||
1724                     strlen(val) == 0 || !isdigit(val[0]))
1725                         GOTO(out_free_nid, rc = -EINVAL);
1726
1727                 cmd->tc_rpc_rate = simple_strtoull(val, NULL, 10);
1728                 if (cmd->tc_rpc_rate <= 0 ||
1729                     cmd->tc_rpc_rate >= LPROCFS_NRS_RATE_MAX)
1730                         GOTO(out_free_nid, rc = -EINVAL);
1731         } else {
1732                 if (cmd->tc_cmd == NRS_CTL_TBF_CHANGE_RATE)
1733                         GOTO(out_free_nid, rc = -EINVAL);
1734                 /* No RPC rate given */
1735                 cmd->tc_rpc_rate = tbf_rate;
1736         }
1737         goto out;
1738 out_free_nid:
1739         nrs_tbf_cmd_fini(cmd);
1740 out_free_cmd:
1741         OBD_FREE_PTR(cmd);
1742 out:
1743         if (rc)
1744                 cmd = ERR_PTR(rc);
1745         return cmd;
1746 }
1747
1748 extern struct nrs_core nrs_core;
1749 #define LPROCFS_WR_NRS_TBF_MAX_CMD (4096)
1750 static ssize_t
1751 ptlrpc_lprocfs_nrs_tbf_rule_seq_write(struct file *file, const char *buffer,
1752                                       size_t count, loff_t *off)
1753 {
1754         struct seq_file           *m = file->private_data;
1755         struct ptlrpc_service     *svc = m->private;
1756         char                      *kernbuf;
1757         char                      *val;
1758         int                        rc;
1759         static struct nrs_tbf_cmd *cmd;
1760         enum ptlrpc_nrs_queue_type queue = PTLRPC_NRS_QUEUE_BOTH;
1761         unsigned long              length;
1762         char                      *token;
1763
1764         OBD_ALLOC(kernbuf, LPROCFS_WR_NRS_TBF_MAX_CMD);
1765         if (kernbuf == NULL)
1766                 GOTO(out, rc = -ENOMEM);
1767
1768         if (count > LPROCFS_WR_NRS_TBF_MAX_CMD - 1)
1769                 GOTO(out_free_kernbuff, rc = -EINVAL);
1770
1771         if (copy_from_user(kernbuf, buffer, count))
1772                 GOTO(out_free_kernbuff, rc = -EFAULT);
1773
1774         val = kernbuf;
1775         token = strsep(&val, " ");
1776         if (val == NULL)
1777                 GOTO(out_free_kernbuff, rc = -EINVAL);
1778
1779         if (strcmp(token, "reg") == 0) {
1780                 queue = PTLRPC_NRS_QUEUE_REG;
1781         } else if (strcmp(token, "hp") == 0) {
1782                 queue = PTLRPC_NRS_QUEUE_HP;
1783         } else {
1784                 kernbuf[strlen(token)] = ' ';
1785                 val = kernbuf;
1786         }
1787         length = strlen(val);
1788
1789         if (length == 0)
1790                 GOTO(out_free_kernbuff, rc = -EINVAL);
1791
1792         if (queue == PTLRPC_NRS_QUEUE_HP && !nrs_svc_has_hp(svc))
1793                 GOTO(out_free_kernbuff, rc = -ENODEV);
1794         else if (queue == PTLRPC_NRS_QUEUE_BOTH && !nrs_svc_has_hp(svc))
1795                 queue = PTLRPC_NRS_QUEUE_REG;
1796
1797         cmd = nrs_tbf_parse_cmd(val, length);
1798         if (IS_ERR(cmd))
1799                 GOTO(out_free_kernbuff, rc = PTR_ERR(cmd));
1800
1801         /**
1802          * Serialize NRS core lprocfs operations with policy registration/
1803          * unregistration.
1804          */
1805         mutex_lock(&nrs_core.nrs_mutex);
1806         rc = ptlrpc_nrs_policy_control(svc, queue,
1807                                        NRS_POL_NAME_TBF,
1808                                        NRS_CTL_TBF_WR_RULE,
1809                                        false, cmd);
1810         mutex_unlock(&nrs_core.nrs_mutex);
1811
1812         nrs_tbf_cmd_fini(cmd);
1813         OBD_FREE_PTR(cmd);
1814 out_free_kernbuff:
1815         OBD_FREE(kernbuf, LPROCFS_WR_NRS_TBF_MAX_CMD);
1816 out:
1817         return rc ? rc : count;
1818 }
1819 LPROC_SEQ_FOPS(ptlrpc_lprocfs_nrs_tbf_rule);
1820
1821 /**
1822  * Initializes a TBF policy's lprocfs interface for service \a svc
1823  *
1824  * \param[in] svc the service
1825  *
1826  * \retval 0    success
1827  * \retval != 0 error
1828  */
1829 static int nrs_tbf_lprocfs_init(struct ptlrpc_service *svc)
1830 {
1831         struct lprocfs_vars nrs_tbf_lprocfs_vars[] = {
1832                 { .name         = "nrs_tbf_rule",
1833                   .fops         = &ptlrpc_lprocfs_nrs_tbf_rule_fops,
1834                   .data = svc },
1835                 { NULL }
1836         };
1837
1838         if (svc->srv_procroot == NULL)
1839                 return 0;
1840
1841         return lprocfs_add_vars(svc->srv_procroot, nrs_tbf_lprocfs_vars, NULL);
1842 }
1843
1844 /**
1845  * Cleans up a TBF policy's lprocfs interface for service \a svc
1846  *
1847  * \param[in] svc the service
1848  */
1849 static void nrs_tbf_lprocfs_fini(struct ptlrpc_service *svc)
1850 {
1851         if (svc->srv_procroot == NULL)
1852                 return;
1853
1854         lprocfs_remove_proc_entry("nrs_tbf_rule", svc->srv_procroot);
1855 }
1856
1857 #endif /* CONFIG_PROC_FS */
1858
1859 /**
1860  * TBF policy operations
1861  */
1862 static const struct ptlrpc_nrs_pol_ops nrs_tbf_ops = {
1863         .op_policy_start        = nrs_tbf_start,
1864         .op_policy_stop         = nrs_tbf_stop,
1865         .op_policy_ctl          = nrs_tbf_ctl,
1866         .op_res_get             = nrs_tbf_res_get,
1867         .op_res_put             = nrs_tbf_res_put,
1868         .op_req_get             = nrs_tbf_req_get,
1869         .op_req_enqueue         = nrs_tbf_req_add,
1870         .op_req_dequeue         = nrs_tbf_req_del,
1871         .op_req_stop            = nrs_tbf_req_stop,
1872 #ifdef CONFIG_PROC_FS
1873         .op_lprocfs_init        = nrs_tbf_lprocfs_init,
1874         .op_lprocfs_fini        = nrs_tbf_lprocfs_fini,
1875 #endif
1876 };
1877
1878 /**
1879  * TBF policy configuration
1880  */
1881 struct ptlrpc_nrs_pol_conf nrs_conf_tbf = {
1882         .nc_name                = NRS_POL_NAME_TBF,
1883         .nc_ops                 = &nrs_tbf_ops,
1884         .nc_compat              = nrs_policy_compat_all,
1885 };
1886
1887 /** @} tbf */
1888
1889 /** @} nrs */
1890
1891 #endif /* HAVE_SERVER_SUPPORT */