lustre/quota/qsd_reint.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, 2014, 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 "qsd_internal.h"
  34
  35 /*
  36  * Completion function invoked when the global quota lock enqueue has completed
  37  */
  38 static void qsd_reint_completion(const struct lu_env *env,
  39                                  struct qsd_qtype_info *qqi,
  40                                  struct quota_body *req_qbody,
  41                                  struct quota_body *rep_qbody,
  42                                  struct lustre_handle *lockh,
  43                                  struct lquota_lvb *lvb,
  44                                  void *arg, int rc)
  45 {
  46         struct qsd_instance     *qsd = qqi->qqi_qsd;
  47         __u64                   *slv_ver = (__u64 *)arg;
  48         ENTRY;
  49
  50         if (rc) {
  51                 CDEBUG_LIMIT(rc != -EAGAIN ? D_ERROR : D_QUOTA,
  52                              "%s: failed to enqueue global quota lock, glb fid:"
  53                              DFID", rc:%d\n", qsd->qsd_svname,
  54                              PFID(&req_qbody->qb_fid), rc);
  55                 RETURN_EXIT;
  56         }
  57
  58         CDEBUG(D_QUOTA, "%s: global quota lock successfully acquired, glb "
  59                "fid:"DFID", glb ver:"LPU64", slv fid:"DFID", slv ver:"LPU64"\n",
  60                qsd->qsd_svname, PFID(&req_qbody->qb_fid),
  61                lvb->lvb_glb_ver, PFID(&rep_qbody->qb_slv_fid),
  62                rep_qbody->qb_slv_ver);
  63
  64         *slv_ver = rep_qbody->qb_slv_ver;
  65         memcpy(&qqi->qqi_slv_fid, &rep_qbody->qb_slv_fid,
  66                sizeof(struct lu_fid));
  67         lustre_handle_copy(&qqi->qqi_lockh, lockh);
  68         EXIT;
  69 }
  70
  71 static int qsd_reint_qid(const struct lu_env *env, struct qsd_qtype_info *qqi,
  72                          bool global, union lquota_id *qid, void *rec)
  73 {
  74         struct lquota_entry     *lqe;
  75         int                      rc;
  76         ENTRY;
  77
  78         lqe = lqe_locate(env, qqi->qqi_site, qid);
  79         if (IS_ERR(lqe))
  80                 RETURN(PTR_ERR(lqe));
  81
  82         LQUOTA_DEBUG(lqe, "reintegrating entry");
  83
  84         rc = qsd_update_lqe(env, lqe, global, rec);
  85         if (rc)
  86                 GOTO(out, rc);
  87
  88         rc = qsd_update_index(env, qqi, qid, global, 0, rec);
  89 out:
  90         lqe_putref(lqe);
  91         RETURN(rc);
  92 }
  93
  94 static int qsd_reint_entries(const struct lu_env *env,
  95                              struct qsd_qtype_info *qqi,
  96                              struct idx_info *ii, bool global,
  97                              struct page **pages,
  98                              unsigned int npages, bool need_swab)
  99 {
 100         struct qsd_thread_info  *qti = qsd_info(env);
 101         struct qsd_instance     *qsd = qqi->qqi_qsd;
 102         union lquota_id         *qid = &qti->qti_id;
 103         int                      i, j, k, size;
 104         int                      rc = 0;
 105         ENTRY;
 106
 107         CDEBUG(D_QUOTA, "%s: processing %d pages for %s index\n",
 108                qsd->qsd_svname, npages, global ? "global" : "slave");
 109
 110         /* sanity check on the record size */
 111         if ((global && ii->ii_recsize != sizeof(struct lquota_glb_rec)) ||
 112             (!global && ii->ii_recsize != sizeof(struct lquota_slv_rec))) {
 113                 CERROR("%s: invalid record size (%d) for %s index\n",
 114                        qsd->qsd_svname, ii->ii_recsize,
 115                        global ? "global" : "slave");
 116                 RETURN(-EINVAL);
 117         }
 118
 119         size = ii->ii_recsize + ii->ii_keysize;
 120
 121         for (i = 0; i < npages; i++) {
 122                 union lu_page   *lip = kmap(pages[i]);
 123
 124                 for (j = 0; j < LU_PAGE_COUNT; j++) {
 125                         if (need_swab)
 126                                 /* swab header */
 127                                 lustre_swab_lip_header(&lip->lp_idx);
 128
 129                         if (lip->lp_idx.lip_magic != LIP_MAGIC) {
 130                                 CERROR("%s: invalid magic (%x != %x) for page "
 131                                        "%d/%d while transferring %s index\n",
 132                                        qsd->qsd_svname, lip->lp_idx.lip_magic,
 133                                        LIP_MAGIC, i + 1, npages,
 134                                        global ? "global" : "slave");
 135                                 GOTO(out, rc = -EINVAL);
 136                         }
 137
 138                         CDEBUG(D_QUOTA, "%s: processing page %d/%d with %d "
 139                                "entries for %s index\n", qsd->qsd_svname, i + 1,
 140                                npages, lip->lp_idx.lip_nr,
 141                                global ? "global" : "slave");
 142
 143                         for (k = 0; k < lip->lp_idx.lip_nr; k++) {
 144                                 char *entry;
 145
 146                                 entry = lip->lp_idx.lip_entries + k * size;
 147                                 memcpy(qid, entry, ii->ii_keysize); /* key */
 148                                 entry += ii->ii_keysize;            /* value */
 149
 150                                 if (need_swab) {
 151                                         int offset = 0;
 152
 153                                         /* swab key */
 154                                         __swab64s(&qid->qid_uid);
 155                                         /* quota records only include 64-bit
 156                                          * fields */
 157                                         while (offset < ii->ii_recsize) {
 158                                                 __swab64s((__u64 *)
 159                                                               (entry + offset));
 160                                                 offset += sizeof(__u64);
 161                                         }
 162                                 }
 163
 164                                 rc = qsd_reint_qid(env, qqi, global, qid,
 165                                                    (void *)entry);
 166                                 if (rc)
 167                                         GOTO(out, rc);
 168                         }
 169                         lip++;
 170                 }
 171 out:
 172                 kunmap(pages[i]);
 173                 if (rc)
 174                         break;
 175         }
 176         RETURN(rc);
 177 }
 178
 179 static int qsd_reint_index(const struct lu_env *env, struct qsd_qtype_info *qqi,
 180                            bool global)
 181 {
 182         struct qsd_thread_info  *qti = qsd_info(env);
 183         struct qsd_instance     *qsd = qqi->qqi_qsd;
 184         struct idx_info         *ii = &qti->qti_ii;
 185         struct lu_fid           *fid;
 186         struct page             **pages = NULL;
 187         unsigned int             npages, pg_cnt;
 188         __u64                    start_hash = 0, ver = 0;
 189         bool                     need_swab = false;
 190         int                      i, rc;
 191         ENTRY;
 192
 193         fid = global ? &qqi->qqi_fid : &qqi->qqi_slv_fid;
 194
 195         /* let's do a 1MB bulk */
 196         npages = min_t(unsigned int, OFD_MAX_BRW_SIZE, 1 << 20);
 197         npages /= PAGE_CACHE_SIZE;
 198
 199         /* allocate pages for bulk index read */
 200         OBD_ALLOC(pages, npages * sizeof(*pages));
 201         if (pages == NULL)
 202                 GOTO(out, rc = -ENOMEM);
 203         for (i = 0; i < npages; i++) {
 204                 pages[i] = alloc_page(GFP_IOFS);
 205                 if (pages[i] == NULL)
 206                         GOTO(out, rc = -ENOMEM);
 207         }
 208
 209 repeat:
 210         /* initialize index_info request with FID of global index */
 211         memset(ii, 0, sizeof(*ii));
 212         memcpy(&ii->ii_fid, fid, sizeof(*fid));
 213         ii->ii_magic = IDX_INFO_MAGIC;
 214         ii->ii_flags = II_FL_NOHASH;
 215         ii->ii_count = npages * LU_PAGE_COUNT;
 216         ii->ii_hash_start = start_hash;
 217
 218         /* send bulk request to quota master to read global index */
 219         rc = qsd_fetch_index(env, qsd->qsd_exp, ii, npages, pages, &need_swab);
 220         if (rc) {
 221                 CWARN("%s: failed to fetch index for "DFID". %d\n",
 222                       qsd->qsd_svname, PFID(fid), rc);
 223                 GOTO(out, rc);
 224         }
 225
 226         /* various sanity checks */
 227         if (ii->ii_magic != IDX_INFO_MAGIC) {
 228                 CERROR("%s: invalid magic in index transfer %x != %x\n",
 229                        qsd->qsd_svname, ii->ii_magic, IDX_INFO_MAGIC);
 230                 GOTO(out, rc = -EPROTO);
 231         }
 232         if ((ii->ii_flags & II_FL_VARKEY) != 0)
 233                 CWARN("%s: II_FL_VARKEY is set on index transfer for fid "DFID
 234                       ", it shouldn't be\n", qsd->qsd_svname, PFID(fid));
 235         if ((ii->ii_flags & II_FL_NONUNQ) != 0)
 236                 CWARN("%s: II_FL_NONUNQ is set on index transfer for fid "DFID
 237                       ", it shouldn't be\n", qsd->qsd_svname, PFID(fid));
 238         if (ii->ii_keysize != sizeof(__u64)) {
 239                 CERROR("%s: invalid key size reported on index transfer for "
 240                        "fid "DFID", %u != %u\n", qsd->qsd_svname, PFID(fid),
 241                        ii->ii_keysize, (int)sizeof(__u64));
 242                 GOTO(out, rc = -EPROTO);
 243         }
 244         if (ii->ii_version == 0 && ii->ii_count != 0)
 245                 CWARN("%s: index version for fid "DFID" is 0, but index isn't "
 246                       "empty (%d)\n", qsd->qsd_svname, PFID(fid), ii->ii_count);
 247
 248         CDEBUG(D_QUOTA, "%s: reintegration process for fid "DFID" successfully "
 249                "fetched %s index, count = %d\n", qsd->qsd_svname,
 250                PFID(fid), global ? "global" : "slave", ii->ii_count);
 251
 252         if (start_hash == 0)
 253                 /* record version associated with the first bulk transfer */
 254                 ver = ii->ii_version;
 255
 256         pg_cnt = (ii->ii_count + (LU_PAGE_COUNT) - 1);
 257         pg_cnt >>= PAGE_CACHE_SHIFT - LU_PAGE_SHIFT;
 258
 259         if (pg_cnt > npages) {
 260                 CERROR("%s: master returned more pages than expected, %u > %u"
 261                        "\n", qsd->qsd_svname, pg_cnt, npages);
 262                 pg_cnt = npages;
 263         }
 264
 265         rc = qsd_reint_entries(env, qqi, ii, global, pages, pg_cnt, need_swab);
 266         if (rc)
 267                 GOTO(out, rc);
 268
 269         if (ii->ii_hash_end != II_END_OFF) {
 270                 start_hash = ii->ii_hash_end;
 271                 goto repeat;
 272         }
 273 out:
 274         if (pages != NULL) {
 275                 for (i = 0; i < npages; i++)
 276                         if (pages[i] != NULL)
 277                                 __free_page(pages[i]);
 278                 OBD_FREE(pages, npages * sizeof(*pages));
 279         }
 280
 281         /* Update index version */
 282         if (rc == 0) {
 283                 rc = qsd_write_version(env, qqi, ver, global);
 284                 if (rc)
 285                         CERROR("%s: write version "LPU64" to "DFID" failed. "
 286                                "%d\n", qsd->qsd_svname, ver, PFID(fid), rc);
 287         }
 288
 289         RETURN(rc);
 290 }
 291
 292 static int qsd_reconciliation(const struct lu_env *env,
 293                               struct qsd_qtype_info *qqi)
 294 {
 295         struct qsd_thread_info  *qti = qsd_info(env);
 296         struct qsd_instance     *qsd = qqi->qqi_qsd;
 297         const struct dt_it_ops  *iops;
 298         struct dt_it            *it;
 299         struct dt_key           *key;
 300         struct lquota_entry     *lqe;
 301         union lquota_id         *qid = &qti->qti_id;
 302         int                      rc;
 303         ENTRY;
 304
 305         LASSERT(qqi->qqi_glb_obj != NULL);
 306         iops = &qqi->qqi_glb_obj->do_index_ops->dio_it;
 307
 308         it = iops->init(env, qqi->qqi_glb_obj, 0, BYPASS_CAPA);
 309         if (IS_ERR(it)) {
 310                 CWARN("%s: Initialize it for "DFID" failed. %ld\n",
 311                       qsd->qsd_svname, PFID(&qqi->qqi_fid), PTR_ERR(it));
 312                 RETURN(PTR_ERR(it));
 313         }
 314
 315         rc = iops->load(env, it, 0);
 316         if (rc < 0) {
 317                 CWARN("%s: Load first entry for "DFID" failed. %d\n",
 318                       qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 319                 GOTO(out, rc);
 320         } else if (rc == 0) {
 321                 rc = iops->next(env, it);
 322                 if (rc != 0)
 323                         GOTO(out, rc = (rc < 0) ? rc : 0);
 324         }
 325
 326         do {
 327                 key = iops->key(env, it);
 328                 if (IS_ERR(key)) {
 329                         CWARN("%s: Error key for "DFID". %ld\n",
 330                               qsd->qsd_svname, PFID(&qqi->qqi_fid),
 331                               PTR_ERR(key));
 332                         GOTO(out, rc = PTR_ERR(key));
 333                 }
 334
 335                 /* skip the root user/group */
 336                 if (*((__u64 *)key) == 0)
 337                         goto next;
 338
 339                 qid->qid_uid = *((__u64 *)key);
 340
 341                 lqe = lqe_locate(env, qqi->qqi_site, qid);
 342                 if (IS_ERR(lqe)) {
 343                         CWARN("%s: failed to locate lqe. "DFID", %ld\n",
 344                               qsd->qsd_svname, PFID(&qqi->qqi_fid),
 345                               PTR_ERR(lqe));
 346                         GOTO(out, rc = PTR_ERR(lqe));
 347                 }
 348
 349                 rc = qsd_refresh_usage(env, lqe);
 350                 if (rc) {
 351                         CWARN("%s: failed to get usage. "DFID", %d\n",
 352                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 353                         lqe_putref(lqe);
 354                         GOTO(out, rc);
 355                 }
 356
 357                 rc = qsd_adjust(env, lqe);
 358                 lqe_putref(lqe);
 359                 if (rc) {
 360                         CWARN("%s: failed to report quota. "DFID", %d\n",
 361                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 362                         GOTO(out, rc);
 363                 }
 364 next:
 365                 rc = iops->next(env, it);
 366                 if (rc < 0)
 367                         CWARN("%s: failed to parse index, ->next error:%d "DFID
 368                               "\n", qsd->qsd_svname, rc, PFID(&qqi->qqi_fid));
 369         } while (rc == 0);
 370
 371         /* reach the end */
 372         if (rc > 0)
 373                 rc = 0;
 374 out:
 375         iops->put(env, it);
 376         iops->fini(env, it);
 377         RETURN(rc);
 378 }
 379
 380 static int qsd_connected(struct qsd_instance *qsd)
 381 {
 382         int     connected;
 383
 384         read_lock(&qsd->qsd_lock);
 385         connected = qsd->qsd_exp_valid ? 1 : 0;
 386         read_unlock(&qsd->qsd_lock);
 387
 388         return connected;
 389 }
 390
 391 static int qsd_started(struct qsd_instance *qsd)
 392 {
 393         int     started;
 394
 395         read_lock(&qsd->qsd_lock);
 396         started = qsd->qsd_started ? 1 : 0;
 397         read_unlock(&qsd->qsd_lock);
 398
 399         return started;
 400 }
 401
 402 /*
 403  * Routine executed by the reintegration thread.
 404  */
 405 static int qsd_reint_main(void *args)
 406 {
 407         struct lu_env           *env;
 408         struct qsd_thread_info  *qti;
 409         struct qsd_qtype_info   *qqi = (struct qsd_qtype_info *)args;
 410         struct qsd_instance     *qsd = qqi->qqi_qsd;
 411         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 412         struct l_wait_info       lwi = { 0 };
 413         int                      rc;
 414         ENTRY;
 415
 416         CDEBUG(D_QUOTA, "%s: Starting reintegration thread for "DFID"\n",
 417                qsd->qsd_svname, PFID(&qqi->qqi_fid));
 418
 419         qqi_getref(qqi);
 420         lu_ref_add(&qqi->qqi_reference, "reint_thread", thread);
 421
 422         thread_set_flags(thread, SVC_RUNNING);
 423         wake_up(&thread->t_ctl_waitq);
 424
 425         OBD_ALLOC_PTR(env);
 426         if (env == NULL)
 427                 GOTO(out, rc = -ENOMEM);
 428
 429         /* initialize environment */
 430         rc = lu_env_init(env, LCT_DT_THREAD);
 431         if (rc)
 432                 GOTO(out_env, rc);
 433         qti = qsd_info(env);
 434
 435         /* wait for the connection to master established */
 436         l_wait_event(thread->t_ctl_waitq,
 437                      qsd_connected(qsd) || !thread_is_running(thread), &lwi);
 438
 439         /* Step 1: enqueue global index lock */
 440         if (!thread_is_running(thread))
 441                 GOTO(out_env_init, rc = 0);
 442
 443         LASSERT(qsd->qsd_exp != NULL);
 444         LASSERT(qqi->qqi_glb_uptodate == 0 || qqi->qqi_slv_uptodate == 0);
 445
 446         memset(&qti->qti_lvb, 0, sizeof(qti->qti_lvb));
 447
 448         read_lock(&qsd->qsd_lock);
 449         /* check whether we already own a global quota lock for this type */
 450         if (lustre_handle_is_used(&qqi->qqi_lockh) &&
 451             ldlm_lock_addref_try(&qqi->qqi_lockh, qsd_glb_einfo.ei_mode) == 0) {
 452                 read_unlock(&qsd->qsd_lock);
 453                 /* force refresh of global & slave index copy */
 454                 qti->qti_lvb.lvb_glb_ver = ~0ULL;
 455                 qti->qti_slv_ver = ~0ULL;
 456         } else {
 457                 /* no valid lock found, let's enqueue a new one */
 458                 read_unlock(&qsd->qsd_lock);
 459
 460                 memset(&qti->qti_body, 0, sizeof(qti->qti_body));
 461                 memcpy(&qti->qti_body.qb_fid, &qqi->qqi_fid,
 462                        sizeof(qqi->qqi_fid));
 463
 464                 rc = qsd_intent_lock(env, qsd->qsd_exp, &qti->qti_body, true,
 465                                      IT_QUOTA_CONN, qsd_reint_completion, qqi,
 466                                      &qti->qti_lvb, (void *)&qti->qti_slv_ver);
 467                 if (rc)
 468                         GOTO(out_env_init, rc);
 469
 470                 CDEBUG(D_QUOTA, "%s: glb_ver:"LPU64"/"LPU64",slv_ver:"LPU64"/"
 471                        LPU64"\n", qsd->qsd_svname,
 472                        qti->qti_lvb.lvb_glb_ver, qqi->qqi_glb_ver,
 473                        qti->qti_slv_ver, qqi->qqi_slv_ver);
 474         }
 475
 476         /* Step 2: reintegrate global index */
 477         if (!thread_is_running(thread))
 478                 GOTO(out_lock, rc = 0);
 479
 480         OBD_FAIL_TIMEOUT(OBD_FAIL_QUOTA_DELAY_REINT, 10);
 481
 482         if (qqi->qqi_glb_ver != qti->qti_lvb.lvb_glb_ver) {
 483                 rc = qsd_reint_index(env, qqi, true);
 484                 if (rc) {
 485                         CWARN("%s: reint global for "DFID" failed. %d\n",
 486                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 487                         GOTO(out_lock, rc);
 488                 }
 489         } else {
 490                 qsd_bump_version(qqi, qqi->qqi_glb_ver, true);
 491         }
 492
 493         /* Step 3: reintegrate slave index */
 494         if (!thread_is_running(thread))
 495                 GOTO(out_lock, rc = 0);
 496
 497         if (qqi->qqi_slv_ver != qti->qti_slv_ver) {
 498                 rc = qsd_reint_index(env, qqi, false);
 499                 if (rc) {
 500                         CWARN("%s: reintegration for "DFID" failed with %d\n",
 501                               qsd->qsd_svname, PFID(&qqi->qqi_slv_fid), rc);
 502                         GOTO(out_lock, rc);
 503                 }
 504         } else {
 505                 qsd_bump_version(qqi, qqi->qqi_slv_ver, false);
 506         }
 507
 508         /* wait for the qsd instance started (target recovery done) */
 509         l_wait_event(thread->t_ctl_waitq,
 510                      qsd_started(qsd) || !thread_is_running(thread), &lwi);
 511
 512         if (!thread_is_running(thread))
 513                 GOTO(out_lock, rc = 0);
 514
 515         /* Step 4: start reconciliation for each enforced ID */
 516         rc = qsd_reconciliation(env, qqi);
 517         if (rc)
 518                 CWARN("%s: reconciliation for "DFID" failed with %d\n",
 519                       qsd->qsd_svname, PFID(&qqi->qqi_slv_fid), rc);
 520
 521         EXIT;
 522 out_lock:
 523         ldlm_lock_decref(&qqi->qqi_lockh, qsd_glb_einfo.ei_mode);
 524 out_env_init:
 525         lu_env_fini(env);
 526 out_env:
 527         OBD_FREE_PTR(env);
 528 out:
 529         write_lock(&qsd->qsd_lock);
 530         qqi->qqi_reint = 0;
 531         write_unlock(&qsd->qsd_lock);
 532
 533         qqi_putref(qqi);
 534         lu_ref_del(&qqi->qqi_reference, "reint_thread", thread);
 535
 536         thread_set_flags(thread, SVC_STOPPED);
 537         wake_up(&thread->t_ctl_waitq);
 538         return rc;
 539 }
 540
 541 void qsd_stop_reint_thread(struct qsd_qtype_info *qqi)
 542 {
 543         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 544         struct l_wait_info       lwi = { 0 };
 545
 546         if (!thread_is_stopped(thread)) {
 547                 thread_set_flags(thread, SVC_STOPPING);
 548                 wake_up(&thread->t_ctl_waitq);
 549
 550                 l_wait_event(thread->t_ctl_waitq,
 551                              thread_is_stopped(thread), &lwi);
 552         }
 553 }
 554
 555 static int qsd_entry_iter_cb(cfs_hash_t *hs, cfs_hash_bd_t *bd,
 556                              struct hlist_node *hnode, void *data)
 557 {
 558         struct lquota_entry     *lqe;
 559         int                     *pending = (int *)data;
 560
 561         lqe = hlist_entry(hnode, struct lquota_entry, lqe_hash);
 562         LASSERT(atomic_read(&lqe->lqe_ref) > 0);
 563
 564         lqe_read_lock(lqe);
 565         *pending += lqe->lqe_pending_req;
 566         lqe_read_unlock(lqe);
 567
 568         return 0;
 569 }
 570
 571 static bool qsd_pending_updates(struct qsd_qtype_info *qqi)
 572 {
 573         struct qsd_instance     *qsd = qqi->qqi_qsd;
 574         struct qsd_upd_rec      *upd;
 575         struct lquota_entry     *lqe, *n;
 576         int                      dqacq = 0;
 577         bool                     updates = false;
 578         ENTRY;
 579
 580         /* any pending quota adjust? */
 581         spin_lock(&qsd->qsd_adjust_lock);
 582         list_for_each_entry_safe(lqe, n, &qsd->qsd_adjust_list, lqe_link) {
 583                 if (lqe2qqi(lqe) == qqi) {
 584                         list_del_init(&lqe->lqe_link);
 585                         lqe_putref(lqe);
 586                 }
 587         }
 588         spin_unlock(&qsd->qsd_adjust_lock);
 589
 590         /* any pending updates? */
 591         read_lock(&qsd->qsd_lock);
 592         list_for_each_entry(upd, &qsd->qsd_upd_list, qur_link) {
 593                 if (upd->qur_qqi == qqi) {
 594                         read_unlock(&qsd->qsd_lock);
 595                         CDEBUG(D_QUOTA, "%s: pending %s updates for type:%d.\n",
 596                                qsd->qsd_svname,
 597                                upd->qur_global ? "global" : "slave",
 598                                qqi->qqi_qtype);
 599                         GOTO(out, updates = true);
 600                 }
 601         }
 602         read_unlock(&qsd->qsd_lock);
 603
 604         /* any pending quota request? */
 605         cfs_hash_for_each_safe(qqi->qqi_site->lqs_hash, qsd_entry_iter_cb,
 606                                &dqacq);
 607         if (dqacq) {
 608                 CDEBUG(D_QUOTA, "%s: pending dqacq for type:%d.\n",
 609                        qsd->qsd_svname, qqi->qqi_qtype);
 610                 updates = true;
 611         }
 612         EXIT;
 613 out:
 614         if (updates)
 615                 CERROR("%s: Delaying reintegration for qtype:%d until pending "
 616                        "updates are flushed.\n",
 617                        qsd->qsd_svname, qqi->qqi_qtype);
 618         return updates;
 619 }
 620
 621 int qsd_start_reint_thread(struct qsd_qtype_info *qqi)
 622 {
 623         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 624         struct qsd_instance     *qsd = qqi->qqi_qsd;
 625         struct l_wait_info       lwi = { 0 };
 626         struct task_struct      *task;
 627         int                      rc;
 628         char                    *name;
 629         ENTRY;
 630
 631         /* don't bother to do reintegration when quota isn't enabled */
 632         if (!qsd_type_enabled(qsd, qqi->qqi_qtype))
 633                 RETURN(0);
 634
 635         if (qsd->qsd_acct_failed)
 636                 /* no space accounting support, can't enable enforcement */
 637                 RETURN(0);
 638
 639         /* check if the reintegration has already started or finished */
 640         write_lock(&qsd->qsd_lock);
 641
 642         if ((qqi->qqi_glb_uptodate && qqi->qqi_slv_uptodate) ||
 643              qqi->qqi_reint || qsd->qsd_stopping) {
 644                 write_unlock(&qsd->qsd_lock);
 645                 RETURN(0);
 646         }
 647         qqi->qqi_reint = 1;
 648
 649         write_unlock(&qsd->qsd_lock);
 650
 651         /* there could be some unfinished global or index entry updates
 652          * (very unlikely), to avoid them messing up with the reint
 653          * procedure, we just return and try to re-start reint later. */
 654         if (qsd_pending_updates(qqi)) {
 655                 write_lock(&qsd->qsd_lock);
 656                 qqi->qqi_reint = 0;
 657                 write_unlock(&qsd->qsd_lock);
 658                 RETURN(0);
 659         }
 660
 661         OBD_ALLOC(name, MTI_NAME_MAXLEN);
 662         if (name == NULL)
 663                 RETURN(-ENOMEM);
 664
 665         snprintf(name, MTI_NAME_MAXLEN, "qsd_reint_%d.%s",
 666                  qqi->qqi_qtype, qsd->qsd_svname);
 667
 668         task = kthread_run(qsd_reint_main, qqi, name);
 669         OBD_FREE(name, MTI_NAME_MAXLEN);
 670
 671         if (IS_ERR(task)) {
 672                 rc = PTR_ERR(task);
 673                 thread_set_flags(thread, SVC_STOPPED);
 674                 write_lock(&qsd->qsd_lock);
 675                 qqi->qqi_reint = 0;
 676                 write_unlock(&qsd->qsd_lock);
 677                 RETURN(rc);
 678         }
 679
 680         l_wait_event(thread->t_ctl_waitq,
 681                      thread_is_running(thread) || thread_is_stopped(thread),
 682                      &lwi);
 683         RETURN(0);
 684 }