lustre/quota/qsd_writeback.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, 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, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA
  20  *
  21  * GPL HEADER END
  22  */
  23 /*
  24  * Copyright (c) 2012, 2017, Intel Corporation.
  25  * Use is subject to license terms.
  26  *
  27  * Author: Johann Lombardi <johann.lombardi@intel.com>
  28  * Author: Niu    Yawei    <yawei.niu@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LQUOTA
  32
  33 #include <linux/kthread.h>
  34 #include "qsd_internal.h"
  35
  36 /*
  37  * Allocate and fill an qsd_upd_rec structure to be processed by the writeback
  38  * thread.
  39  *
  40  * \param qqi - is the qsd_qtype_info structure relevant to the update
  41  * \param lqe - is the lquota entry subject to the update
  42  * \param qid - is the identifier subject to the update
  43  * \param rec - is the record storing the new quota settings
  44  * \param ver - is the version associated with the update
  45  * \param global - is a boolean set to true if this is an update of the global
  46  *                 index and false for a slave index.
  47  */
  48 static struct qsd_upd_rec *qsd_upd_alloc(struct qsd_qtype_info *qqi,
  49                                          struct lquota_entry *lqe,
  50                                          union lquota_id *qid,
  51                                          union lquota_rec *rec, __u64 ver,
  52                                          bool global)
  53 {
  54         struct qsd_upd_rec      *upd;
  55
  56         OBD_SLAB_ALLOC_PTR_GFP(upd, upd_kmem, GFP_NOFS);
  57         if (upd == NULL) {
  58                 return NULL;
  59         }
  60
  61         /* fill it */
  62         INIT_LIST_HEAD(&upd->qur_link);
  63         upd->qur_qqi = qqi;
  64         upd->qur_lqe = lqe;
  65         if (lqe)
  66                 lqe_getref(lqe);
  67         upd->qur_qid    = *qid;
  68         upd->qur_rec    = *rec;
  69         upd->qur_ver    = ver;
  70         upd->qur_global = global;
  71
  72         return upd;
  73 }
  74
  75 static void qsd_upd_free(struct qsd_upd_rec *upd)
  76 {
  77         if (upd->qur_lqe)
  78                 lqe_putref(upd->qur_lqe);
  79         OBD_SLAB_FREE_PTR(upd, upd_kmem);
  80 }
  81
  82 /* must hold the qsd_lock */
  83 static void qsd_upd_add(struct qsd_instance *qsd, struct qsd_upd_rec *upd)
  84 {
  85         if (!qsd->qsd_stopping) {
  86                 list_add_tail(&upd->qur_link, &qsd->qsd_upd_list);
  87                 /* wake up the upd thread */
  88                 if (qsd->qsd_upd_task)
  89                         wake_up_process(qsd->qsd_upd_task);
  90         } else {
  91                 CWARN("%s: discard update.\n", qsd->qsd_svname);
  92                 if (upd->qur_lqe)
  93                         LQUOTA_WARN(upd->qur_lqe, "discard update.");
  94                 qsd_upd_free(upd);
  95         }
  96 }
  97
  98 /* must hold the qsd_lock */
  99 static void qsd_add_deferred(struct qsd_instance *qsd, struct list_head *list,
 100                              struct qsd_upd_rec *upd)
 101 {
 102         struct qsd_upd_rec      *tmp, *n;
 103
 104         if (qsd->qsd_stopping) {
 105                 CWARN("%s: discard deferred udpate.\n", qsd->qsd_svname);
 106                 if (upd->qur_lqe)
 107                         LQUOTA_WARN(upd->qur_lqe, "discard deferred update.");
 108                 qsd_upd_free(upd);
 109                 return;
 110         }
 111
 112         /* Sort the updates in ascending order */
 113         list_for_each_entry_safe_reverse(tmp, n, list, qur_link) {
 114
 115                 /* There could be some legacy records which have duplicated
 116                  * version. Imagine following scenario: slave received global
 117                  * glimpse and queued a record in the deferred list, then
 118                  * master crash and rollback to an ealier version, then the
 119                  * version of queued record will be conflicting with later
 120                  * updates. We should just delete the legacy record in such
 121                  * case. */
 122                 if (upd->qur_ver == tmp->qur_ver) {
 123                         if (tmp->qur_lqe)
 124                                 LQUOTA_WARN(tmp->qur_lqe, "Found a conflict "
 125                                             "record with ver:%llu",
 126                                             tmp->qur_ver);
 127                         else
 128                                 CWARN("%s: Found a conflict record with ver: "
 129                                       "%llu\n", qsd->qsd_svname, tmp->qur_ver);
 130
 131                         list_del_init(&tmp->qur_link);
 132                         qsd_upd_free(tmp);
 133                 } else if (upd->qur_ver < tmp->qur_ver) {
 134                         continue;
 135                 } else {
 136                         list_add_tail(&upd->qur_link, &tmp->qur_link);
 137                         return;
 138                 }
 139         }
 140         list_add(&upd->qur_link, list);
 141 }
 142
 143 /* must hold the qsd_lock */
 144 static void qsd_kickoff_deferred(struct qsd_qtype_info *qqi,
 145                                  struct list_head *list, __u64 ver)
 146 {
 147         struct qsd_upd_rec      *upd, *tmp;
 148         ENTRY;
 149
 150         /* Get the first update record in the list, which has the smallest
 151          * version, discard all records with versions smaller than the current
 152          * one */
 153         list_for_each_entry_safe(upd, tmp, list, qur_link) {
 154                 if (upd->qur_ver <= ver) {
 155                         /* drop this update */
 156                         list_del_init(&upd->qur_link);
 157                         CDEBUG(D_QUOTA, "%s: skipping deferred update ver:"
 158                                "%llu/%llu, global:%d, qid:%llu\n",
 159                                qqi->qqi_qsd->qsd_svname, upd->qur_ver, ver,
 160                                upd->qur_global, upd->qur_qid.qid_uid);
 161                         qsd_upd_free(upd);
 162                 } else {
 163                         break;
 164                 }
 165         }
 166
 167         /* No remaining deferred update */
 168         if (list_empty(list))
 169                 RETURN_EXIT;
 170
 171         CDEBUG(D_QUOTA, "%s: found deferred update record. "
 172                "version:%llu/%llu, global:%d, qid:%llu\n",
 173                qqi->qqi_qsd->qsd_svname, upd->qur_ver, ver,
 174                upd->qur_global, upd->qur_qid.qid_uid);
 175
 176         LASSERTF(upd->qur_ver > ver, "lur_ver:%llu, cur_ver:%llu\n",
 177                  upd->qur_ver, ver);
 178
 179         /* Kick off the deferred udpate */
 180         if (upd->qur_ver == ver + 1) {
 181                 list_del_init(&upd->qur_link);
 182                 qsd_upd_add(qqi->qqi_qsd, upd);
 183         }
 184         EXIT;
 185 }
 186
 187 /* Bump version of global or slave index copy
 188  *
 189  * \param qqi    - qsd_qtype_info
 190  * \param ver    - version to be bumped to
 191  * \param global - global or slave index copy?
 192  */
 193 void qsd_bump_version(struct qsd_qtype_info *qqi, __u64 ver, bool global)
 194 {
 195         struct list_head *list;
 196         __u64            *idx_ver;
 197
 198         idx_ver = global ? &qqi->qqi_glb_ver : &qqi->qqi_slv_ver;
 199         list    = global ? &qqi->qqi_deferred_glb : &qqi->qqi_deferred_slv;
 200
 201         write_lock(&qqi->qqi_qsd->qsd_lock);
 202         *idx_ver = ver;
 203         if (global)
 204                 qqi->qqi_glb_uptodate = 1;
 205         else
 206                 qqi->qqi_slv_uptodate = 1;
 207         qsd_kickoff_deferred(qqi, list, ver);
 208         write_unlock(&qqi->qqi_qsd->qsd_lock);
 209 }
 210
 211 /*
 212  * Schedule a commit of a lquota entry
 213  *
 214  * \param  qqi   - qsd_qtype_info
 215  * \param  lqe   - lquota_entry
 216  * \param  qid   - quota id
 217  * \param  rec   - global or slave record to be updated to disk
 218  * \param  ver   - new index file version
 219  * \param  global- true: master record; false: slave record
 220  */
 221 void qsd_upd_schedule(struct qsd_qtype_info *qqi, struct lquota_entry *lqe,
 222                       union lquota_id *qid, union lquota_rec *rec, __u64 ver,
 223                       bool global)
 224 {
 225         struct qsd_upd_rec      *upd;
 226         struct qsd_instance     *qsd = qqi->qqi_qsd;
 227         __u64                    cur_ver;
 228         ENTRY;
 229
 230         CDEBUG(D_QUOTA, "%s: schedule update. global:%s, version:%llu\n",
 231                qsd->qsd_svname, global ? "true" : "false", ver);
 232
 233         upd = qsd_upd_alloc(qqi, lqe, qid, rec, ver, global);
 234         if (upd == NULL)
 235                 RETURN_EXIT;
 236
 237         /* If we don't want update index version, no need to sort the
 238          * records in version order, just schedule the updates instantly. */
 239         if (ver == 0) {
 240                 write_lock(&qsd->qsd_lock);
 241                 qsd_upd_add(qsd, upd);
 242                 write_unlock(&qsd->qsd_lock);
 243                 RETURN_EXIT;
 244         }
 245
 246         write_lock(&qsd->qsd_lock);
 247
 248         cur_ver = global ? qqi->qqi_glb_ver : qqi->qqi_slv_ver;
 249
 250         if (ver <= cur_ver) {
 251                 if (global)
 252                         /* legitimate race between glimpse AST and
 253                          * reintegration */
 254                         CDEBUG(D_QUOTA, "%s: discarding glb update from glimpse"
 255                                " ver:%llu local ver:%llu\n",
 256                                qsd->qsd_svname, ver, cur_ver);
 257                 else
 258                         CERROR("%s: discard slv update, ver:%llu local ver:"
 259                                "%llu\n", qsd->qsd_svname, ver, cur_ver);
 260                 qsd_upd_free(upd);
 261         } else if ((ver == cur_ver + 1) && qqi->qqi_glb_uptodate &&
 262                    qqi->qqi_slv_uptodate) {
 263                 /* In order update, and reintegration has been done. */
 264                 qsd_upd_add(qsd, upd);
 265         } else {
 266                 /* Out of order update (the one with smaller version hasn't
 267                  * reached slave or hasn't been flushed to disk yet), or
 268                  * the reintegration is in progress. Defer the update. */
 269                 struct list_head *list = global ? &qqi->qqi_deferred_glb :
 270                                                   &qqi->qqi_deferred_slv;
 271                 qsd_add_deferred(qsd, list, upd);
 272         }
 273
 274         write_unlock(&qsd->qsd_lock);
 275
 276         EXIT;
 277 }
 278
 279 static int qsd_process_upd(const struct lu_env *env, struct qsd_upd_rec *upd)
 280 {
 281         struct lquota_entry     *lqe = upd->qur_lqe;
 282         struct qsd_qtype_info   *qqi = upd->qur_qqi;
 283         struct qsd_instance     *qsd = qqi->qqi_qsd;
 284         int                      rc;
 285         ENTRY;
 286
 287         if (qsd->qsd_exclusive) { /* It could be deadlock running with reint */
 288                 read_lock(&qsd->qsd_lock);
 289                 rc = qqi->qqi_reint;
 290                 read_unlock(&qsd->qsd_lock);
 291                 if (rc)
 292                         return 1;
 293         }
 294
 295         if (upd->qur_global &&
 296             (LQUOTA_FLAG(upd->qur_rec.lqr_glb_rec.qbr_time) &
 297                                                         LQUOTA_FLAG_DELETED)) {
 298                 struct thandle          *th = NULL;
 299                 struct dt_object        *obj;
 300
 301                 obj = qqi->qqi_glb_obj;
 302
 303                 th = dt_trans_create(env, qqi->qqi_qsd->qsd_dev);
 304                 if (IS_ERR(th))
 305                         RETURN(PTR_ERR(th));
 306
 307                 rc = lquota_disk_declare_write(env, th, obj, &upd->qur_qid);
 308                 if (rc)
 309                         GOTO(out_del, rc);
 310
 311                 rc = dt_trans_start_local(env, qqi->qqi_qsd->qsd_dev, th);
 312                 if (rc)
 313                         GOTO(out_del, rc);
 314
 315                 rc = lquota_disk_delete(env, th, obj, upd->qur_qid.qid_uid,
 316                                         NULL);
 317                 if (rc == -ENOENT)
 318                         rc = 0;
 319
 320 out_del:
 321                 dt_trans_stop(env, qqi->qqi_qsd->qsd_dev, th);
 322                 if (lqe != NULL)
 323                         lqe_set_deleted(lqe);
 324
 325                 qsd_bump_version(qqi, upd->qur_ver, true);
 326                 RETURN(rc);
 327         }
 328
 329         if (lqe == NULL) {
 330                 lqe = lqe_locate(env, qqi->qqi_site, &upd->qur_qid);
 331                 if (IS_ERR(lqe))
 332                         GOTO(out, rc = PTR_ERR(lqe));
 333         }
 334
 335         lqe->lqe_is_deleted = 0;
 336
 337         /* The in-memory lqe update for slave index copy isn't deferred,
 338          * we shouldn't touch it here. */
 339         if (upd->qur_global) {
 340                 rc = qsd_update_lqe(env, lqe, upd->qur_global, &upd->qur_rec);
 341                 if (rc)
 342                         GOTO(out, rc);
 343                 /* refresh usage */
 344                 qsd_refresh_usage(env, lqe);
 345
 346                 spin_lock(&qsd->qsd_adjust_lock);
 347                 lqe->lqe_adjust_time = 0;
 348                 spin_unlock(&qsd->qsd_adjust_lock);
 349
 350                 /* Report usage asynchronously */
 351                 rc = qsd_adjust(env, lqe);
 352                 if (rc)
 353                         LQUOTA_ERROR(lqe, "failed to report usage, rc:%d", rc);
 354         }
 355
 356         rc = qsd_update_index(env, qqi, &upd->qur_qid, upd->qur_global,
 357                               upd->qur_ver, &upd->qur_rec);
 358 out:
 359         if (upd->qur_global && rc == 0 &&
 360             upd->qur_rec.lqr_glb_rec.qbr_softlimit == 0 &&
 361             upd->qur_rec.lqr_glb_rec.qbr_hardlimit == 0 &&
 362             (LQUOTA_FLAG(upd->qur_rec.lqr_glb_rec.qbr_time) &
 363                                                         LQUOTA_FLAG_DEFAULT)) {
 364                 lqe->lqe_is_default = true;
 365                 if (qqi->qqi_default_softlimit == 0 &&
 366                     qqi->qqi_default_hardlimit == 0)
 367                         lqe->lqe_enforced = false;
 368                 else
 369                         lqe->lqe_enforced = true;
 370
 371                 LQUOTA_DEBUG(lqe, "update to use default quota");
 372         }
 373
 374         if (lqe && !IS_ERR(lqe)) {
 375                 lqe_putref(lqe);
 376                 upd->qur_lqe = NULL;
 377         }
 378         RETURN(rc);
 379 }
 380
 381 void qsd_adjust_schedule(struct lquota_entry *lqe, bool defer, bool cancel)
 382 {
 383         struct qsd_instance     *qsd = lqe2qqi(lqe)->qqi_qsd;
 384         bool                     added = false;
 385
 386         read_lock(&qsd->qsd_lock);
 387         if (qsd->qsd_stopping) {
 388                 read_unlock(&qsd->qsd_lock);
 389                 return;
 390         }
 391         read_unlock(&qsd->qsd_lock);
 392
 393         lqe_getref(lqe);
 394         spin_lock(&qsd->qsd_adjust_lock);
 395
 396         /* the lqe is being queued for the per-ID lock cancel, we should
 397          * cancel the lock cancel and re-add it for quota adjust */
 398         if (!list_empty(&lqe->lqe_link) &&
 399             lqe->lqe_adjust_time == 0) {
 400                 list_del_init(&lqe->lqe_link);
 401                 lqe_putref(lqe);
 402         }
 403
 404         if (list_empty(&lqe->lqe_link)) {
 405                 if (!cancel) {
 406                         lqe->lqe_adjust_time = ktime_get_seconds();
 407                         if (defer)
 408                                 lqe->lqe_adjust_time += QSD_WB_INTERVAL;
 409                 } else {
 410                         lqe->lqe_adjust_time = 0;
 411                 }
 412
 413                 /* lqe reference transferred to list */
 414                 if (defer)
 415                         list_add_tail(&lqe->lqe_link,
 416                                           &qsd->qsd_adjust_list);
 417                 else
 418                         list_add(&lqe->lqe_link, &qsd->qsd_adjust_list);
 419                 added = true;
 420         }
 421         spin_unlock(&qsd->qsd_adjust_lock);
 422
 423         if (!added)
 424                 lqe_putref(lqe);
 425         else {
 426                 read_lock(&qsd->qsd_lock);
 427                 if (qsd->qsd_upd_task)
 428                         wake_up_process(qsd->qsd_upd_task);
 429                 read_unlock(&qsd->qsd_lock);
 430         }
 431 }
 432
 433 /* return true if there is pending writeback records or the pending
 434  * adjust requests */
 435 static bool qsd_job_pending(struct qsd_instance *qsd, struct list_head *upd,
 436                             bool *uptodate)
 437 {
 438         bool    job_pending = false;
 439         int     qtype;
 440
 441         LASSERT(list_empty(upd));
 442         *uptodate = true;
 443
 444         spin_lock(&qsd->qsd_adjust_lock);
 445         if (!list_empty(&qsd->qsd_adjust_list)) {
 446                 struct lquota_entry *lqe;
 447                 lqe = list_entry(qsd->qsd_adjust_list.next,
 448                                      struct lquota_entry, lqe_link);
 449                 if (ktime_get_seconds() >= lqe->lqe_adjust_time)
 450                         job_pending = true;
 451         }
 452         spin_unlock(&qsd->qsd_adjust_lock);
 453
 454         write_lock(&qsd->qsd_lock);
 455         if (!list_empty(&qsd->qsd_upd_list)) {
 456                 list_splice_init(&qsd->qsd_upd_list, upd);
 457                 job_pending = true;
 458         }
 459         if (qsd->qsd_exclusive)
 460                 qsd->qsd_updating = job_pending;
 461
 462         for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++) {
 463                 struct qsd_qtype_info *qqi = qsd->qsd_type_array[qtype];
 464
 465                 /* don't bother kicking off reintegration if space accounting
 466                  * failed to be enabled */
 467                 if (qqi->qqi_acct_failed)
 468                         continue;
 469
 470                 if (!qsd_type_enabled(qsd, qtype))
 471                         continue;
 472
 473                 if ((!qqi->qqi_glb_uptodate || !qqi->qqi_slv_uptodate) &&
 474                      !qqi->qqi_reint)
 475                         /* global or slave index not up to date and reint
 476                          * thread not running */
 477                         *uptodate = false;
 478         }
 479
 480         write_unlock(&qsd->qsd_lock);
 481         return job_pending;
 482 }
 483
 484 struct qsd_upd_args {
 485         struct qsd_instance     *qua_inst;
 486         struct lu_env            qua_env;
 487         struct completion       *qua_started;
 488 };
 489
 490 #ifndef TASK_IDLE
 491 /* This identity is only safe inside kernel threads, or other places where
 492  * all signals are disabled.  So it is placed here rather than in an include
 493  * file.
 494  * TASK_IDLE was added in v4.1-rc4-43-g80ed87c8a9ca so this can be removed
 495  * when we no longer support kernels older than that.
 496  */
 497 #define TASK_IDLE TASK_INTERRUPTIBLE
 498 #endif
 499
 500 static int qsd_upd_thread(void *_args)
 501 {
 502         struct qsd_upd_args     *args = _args;
 503         struct qsd_instance     *qsd = args->qua_inst;
 504         LIST_HEAD(queue);
 505         struct qsd_upd_rec      *upd, *n;
 506         struct lu_env           *env = &args->qua_env;
 507         int                      qtype, rc = 0;
 508         bool                     uptodate;
 509         struct lquota_entry     *lqe;
 510         time64_t cur_time;
 511         ENTRY;
 512
 513         complete(args->qua_started);
 514         while (({set_current_state(TASK_IDLE);
 515                  !kthread_should_stop(); })) {
 516                 int count = 0;
 517
 518                 if (!qsd_job_pending(qsd, &queue, &uptodate))
 519                         schedule_timeout(cfs_time_seconds(QSD_WB_INTERVAL));
 520                 __set_current_state(TASK_RUNNING);
 521
 522                 while (1) {
 523                         list_for_each_entry_safe(upd, n, &queue, qur_link) {
 524                                 if (qsd_process_upd(env, upd) <= 0) {
 525                                         list_del_init(&upd->qur_link);
 526                                         qsd_upd_free(upd);
 527                                 }
 528                         }
 529                         if (list_empty(&queue))
 530                                 break;
 531                         count++;
 532                         if (count % 7 == 0) {
 533                                 n = list_first_entry(&queue, struct qsd_upd_rec,
 534                                                      qur_link);
 535                                 CWARN("%s: The reintegration thread [%d] "
 536                                       "blocked more than %ld seconds\n",
 537                                       n->qur_qqi->qqi_qsd->qsd_svname,
 538                                       n->qur_qqi->qqi_qtype, count *
 539                                       cfs_time_seconds(QSD_WB_INTERVAL) / 10);
 540                         }
 541                         schedule_timeout_interruptible(
 542                                 cfs_time_seconds(QSD_WB_INTERVAL) / 10);
 543                 }
 544                 if (qsd->qsd_exclusive) {
 545                         write_lock(&qsd->qsd_lock);
 546                         qsd->qsd_updating = false;
 547                         write_unlock(&qsd->qsd_lock);
 548                 }
 549
 550                 spin_lock(&qsd->qsd_adjust_lock);
 551                 cur_time = ktime_get_seconds();
 552                 while (!list_empty(&qsd->qsd_adjust_list)) {
 553                         lqe = list_entry(qsd->qsd_adjust_list.next,
 554                                          struct lquota_entry, lqe_link);
 555                         /* deferred items are sorted by time */
 556                         if (lqe->lqe_adjust_time > cur_time)
 557                                 break;
 558
 559                         list_del_init(&lqe->lqe_link);
 560                         spin_unlock(&qsd->qsd_adjust_lock);
 561
 562                         if (!kthread_should_stop() && uptodate) {
 563                                 qsd_refresh_usage(env, lqe);
 564                                 if (lqe->lqe_adjust_time == 0)
 565                                         qsd_id_lock_cancel(env, lqe);
 566                                 else
 567                                         qsd_adjust(env, lqe);
 568                         }
 569
 570                         lqe_putref(lqe);
 571                         spin_lock(&qsd->qsd_adjust_lock);
 572                 }
 573                 spin_unlock(&qsd->qsd_adjust_lock);
 574
 575                 if (uptodate || kthread_should_stop())
 576                         continue;
 577
 578                 for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++)
 579                         qsd_start_reint_thread(qsd->qsd_type_array[qtype]);
 580         }
 581         __set_current_state(TASK_RUNNING);
 582
 583         lu_env_fini(env);
 584         OBD_FREE_PTR(args);
 585
 586         RETURN(rc);
 587 }
 588
 589 int qsd_start_upd_thread(struct qsd_instance *qsd)
 590 {
 591         struct qsd_upd_args *args;
 592         struct task_struct *task;
 593         DECLARE_COMPLETION_ONSTACK(started);
 594         int rc;
 595         ENTRY;
 596
 597         OBD_ALLOC_PTR(args);
 598         if (args == NULL)
 599                 RETURN(-ENOMEM);
 600
 601         rc = lu_env_init(&args->qua_env, LCT_DT_THREAD);
 602         if (rc) {
 603                 CERROR("%s: cannot init env: rc = %d\n", qsd->qsd_svname, rc);
 604                 goto out_free;
 605         }
 606         args->qua_inst = qsd;
 607         args->qua_started = &started;
 608
 609         task = kthread_create(qsd_upd_thread, args,
 610                               "lquota_wb_%s", qsd->qsd_svname);
 611         if (IS_ERR(task)) {
 612                 rc = PTR_ERR(task);
 613                 CERROR("fail to start quota update thread: rc = %d\n", rc);
 614                 goto out_fini;
 615         }
 616         qsd->qsd_upd_task = task;
 617         wake_up_process(task);
 618         wait_for_completion(&started);
 619
 620         RETURN(0);
 621
 622 out_fini:
 623         lu_env_fini(&args->qua_env);
 624 out_free:
 625         OBD_FREE_PTR(args);
 626         RETURN(rc);
 627 }
 628
 629 static void qsd_cleanup_deferred(struct qsd_instance *qsd)
 630 {
 631         int     qtype;
 632
 633         for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++) {
 634                 struct qsd_upd_rec      *upd, *tmp;
 635                 struct qsd_qtype_info   *qqi = qsd->qsd_type_array[qtype];
 636
 637                 if (qqi == NULL)
 638                         continue;
 639
 640                 write_lock(&qsd->qsd_lock);
 641                 list_for_each_entry_safe(upd, tmp, &qqi->qqi_deferred_glb,
 642                                          qur_link) {
 643                         CWARN("%s: Free global deferred upd: ID:%llu, "
 644                               "ver:%llu/%llu\n", qsd->qsd_svname,
 645                               upd->qur_qid.qid_uid, upd->qur_ver,
 646                               qqi->qqi_glb_ver);
 647                         list_del_init(&upd->qur_link);
 648                         qsd_upd_free(upd);
 649                 }
 650                 list_for_each_entry_safe(upd, tmp, &qqi->qqi_deferred_slv,
 651                                          qur_link) {
 652                         CWARN("%s: Free slave deferred upd: ID:%llu, "
 653                               "ver:%llu/%llu\n", qsd->qsd_svname,
 654                               upd->qur_qid.qid_uid, upd->qur_ver,
 655                               qqi->qqi_slv_ver);
 656                         list_del_init(&upd->qur_link);
 657                         qsd_upd_free(upd);
 658                 }
 659                 write_unlock(&qsd->qsd_lock);
 660         }
 661 }
 662
 663 static void qsd_cleanup_adjust(struct qsd_instance *qsd)
 664 {
 665         struct lquota_entry     *lqe;
 666
 667         spin_lock(&qsd->qsd_adjust_lock);
 668         while (!list_empty(&qsd->qsd_adjust_list)) {
 669                 lqe = list_entry(qsd->qsd_adjust_list.next,
 670                                  struct lquota_entry, lqe_link);
 671                 list_del_init(&lqe->lqe_link);
 672                 lqe_putref(lqe);
 673         }
 674         spin_unlock(&qsd->qsd_adjust_lock);
 675 }
 676
 677 void qsd_stop_upd_thread(struct qsd_instance *qsd)
 678 {
 679         struct task_struct *task;
 680
 681         write_lock(&qsd->qsd_lock);
 682         task = qsd->qsd_upd_task;
 683         qsd->qsd_upd_task = NULL;
 684         write_unlock(&qsd->qsd_lock);
 685         if (task)
 686                 kthread_stop(task);
 687
 688         qsd_cleanup_deferred(qsd);
 689         qsd_cleanup_adjust(qsd);
 690 }