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, 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 <lustre_swab.h>
  35 #include "qsd_internal.h"
  36
  37 /*
  38  * Completion function invoked when the global quota lock enqueue has completed
  39  */
  40 static void qsd_reint_completion(const struct lu_env *env,
  41                                  struct qsd_qtype_info *qqi,
  42                                  struct quota_body *req_qbody,
  43                                  struct quota_body *rep_qbody,
  44                                  struct lustre_handle *lockh,
  45                                  struct lquota_lvb *lvb,
  46                                  void *arg, int rc)
  47 {
  48         struct qsd_instance     *qsd = qqi->qqi_qsd;
  49         __u64                   *slv_ver = (__u64 *)arg;
  50         ENTRY;
  51
  52         if (rc) {
  53                 CDEBUG_LIMIT(rc != -EAGAIN ? D_ERROR : D_QUOTA,
  54                              "%s: failed to enqueue global quota lock, glb fid:"
  55                              DFID", rc:%d\n", qsd->qsd_svname,
  56                              PFID(&req_qbody->qb_fid), rc);
  57                 RETURN_EXIT;
  58         }
  59
  60         CDEBUG(D_QUOTA, "%s: global quota lock successfully acquired, glb "
  61                "fid:"DFID", glb ver:%llu, slv fid:"DFID", slv ver:%llu\n",
  62                qsd->qsd_svname, PFID(&req_qbody->qb_fid),
  63                lvb->lvb_glb_ver, PFID(&rep_qbody->qb_slv_fid),
  64                rep_qbody->qb_slv_ver);
  65
  66         *slv_ver = rep_qbody->qb_slv_ver;
  67         memcpy(&qqi->qqi_slv_fid, &rep_qbody->qb_slv_fid,
  68                sizeof(struct lu_fid));
  69         lustre_handle_copy(&qqi->qqi_lockh, lockh);
  70         EXIT;
  71 }
  72
  73 static int qsd_reint_qid(const struct lu_env *env, struct qsd_qtype_info *qqi,
  74                          bool global, union lquota_id *qid, void *rec)
  75 {
  76         struct lquota_entry     *lqe;
  77         int                      rc;
  78         ENTRY;
  79
  80         lqe = lqe_locate(env, qqi->qqi_site, qid);
  81         if (IS_ERR(lqe))
  82                 RETURN(PTR_ERR(lqe));
  83
  84         LQUOTA_DEBUG(lqe, "reintegrating entry");
  85
  86         rc = qsd_update_lqe(env, lqe, global, rec);
  87         if (rc)
  88                 GOTO(out, rc);
  89
  90         rc = qsd_update_index(env, qqi, qid, global, 0, rec);
  91 out:
  92
  93         if (global && qid->qid_uid == 0) {
  94                 struct lquota_glb_rec *glb_rec = (struct lquota_glb_rec *)rec;
  95                 qsd_update_default_quota(qqi, glb_rec->qbr_hardlimit,
  96                                          glb_rec->qbr_softlimit,
  97                                          glb_rec->qbr_time);
  98         }
  99
 100         lqe_putref(lqe);
 101         RETURN(rc);
 102 }
 103
 104 static int qsd_reint_entries(const struct lu_env *env,
 105                              struct qsd_qtype_info *qqi,
 106                              struct idx_info *ii, bool global,
 107                              struct page **pages,
 108                              unsigned int npages, bool need_swab)
 109 {
 110         struct qsd_thread_info  *qti = qsd_info(env);
 111         struct qsd_instance     *qsd = qqi->qqi_qsd;
 112         union lquota_id         *qid = &qti->qti_id;
 113         int                      i, j, k, size;
 114         int                      rc = 0;
 115         ENTRY;
 116
 117         CDEBUG(D_QUOTA, "%s: processing %d pages for %s index\n",
 118                qsd->qsd_svname, npages, global ? "global" : "slave");
 119
 120         /* sanity check on the record size */
 121         if ((global && ii->ii_recsize != sizeof(struct lquota_glb_rec)) ||
 122             (!global && ii->ii_recsize != sizeof(struct lquota_slv_rec))) {
 123                 CERROR("%s: invalid record size (%d) for %s index\n",
 124                        qsd->qsd_svname, ii->ii_recsize,
 125                        global ? "global" : "slave");
 126                 RETURN(-EINVAL);
 127         }
 128
 129         size = ii->ii_recsize + ii->ii_keysize;
 130
 131         for (i = 0; i < npages; i++) {
 132                 union lu_page   *lip = kmap(pages[i]);
 133
 134                 for (j = 0; j < LU_PAGE_COUNT; j++) {
 135                         if (need_swab)
 136                                 /* swab header */
 137                                 lustre_swab_lip_header(&lip->lp_idx);
 138
 139                         if (lip->lp_idx.lip_magic != LIP_MAGIC) {
 140                                 CERROR("%s: invalid magic (%x != %x) for page "
 141                                        "%d/%d while transferring %s index\n",
 142                                        qsd->qsd_svname, lip->lp_idx.lip_magic,
 143                                        LIP_MAGIC, i + 1, npages,
 144                                        global ? "global" : "slave");
 145                                 GOTO(out, rc = -EINVAL);
 146                         }
 147
 148                         CDEBUG(D_QUOTA, "%s: processing page %d/%d with %d "
 149                                "entries for %s index\n", qsd->qsd_svname, i + 1,
 150                                npages, lip->lp_idx.lip_nr,
 151                                global ? "global" : "slave");
 152
 153                         for (k = 0; k < lip->lp_idx.lip_nr; k++) {
 154                                 char *entry;
 155
 156                                 entry = lip->lp_idx.lip_entries + k * size;
 157                                 memcpy(qid, entry, ii->ii_keysize); /* key */
 158                                 entry += ii->ii_keysize;            /* value */
 159
 160                                 if (need_swab) {
 161                                         int offset = 0;
 162
 163                                         /* swab key */
 164                                         __swab64s(&qid->qid_uid);
 165                                         /* quota records only include 64-bit
 166                                          * fields */
 167                                         while (offset < ii->ii_recsize) {
 168                                                 __swab64s((__u64 *)
 169                                                               (entry + offset));
 170                                                 offset += sizeof(__u64);
 171                                         }
 172                                 }
 173
 174                                 rc = qsd_reint_qid(env, qqi, global, qid,
 175                                                    (void *)entry);
 176                                 if (rc)
 177                                         GOTO(out, rc);
 178                         }
 179                         lip++;
 180                 }
 181 out:
 182                 kunmap(pages[i]);
 183                 if (rc)
 184                         break;
 185         }
 186         RETURN(rc);
 187 }
 188
 189 static int qsd_reint_index(const struct lu_env *env, struct qsd_qtype_info *qqi,
 190                            bool global)
 191 {
 192         struct qsd_thread_info  *qti = qsd_info(env);
 193         struct qsd_instance     *qsd = qqi->qqi_qsd;
 194         struct idx_info         *ii = &qti->qti_ii;
 195         struct lu_fid           *fid;
 196         struct page             **pages = NULL;
 197         unsigned int             npages, pg_cnt;
 198         __u64                    start_hash = 0, ver = 0;
 199         bool                     need_swab = false;
 200         int                      i, rc;
 201         ENTRY;
 202
 203         fid = global ? &qqi->qqi_fid : &qqi->qqi_slv_fid;
 204
 205         /* let's do a 1MB bulk */
 206         npages = min_t(unsigned int, OFD_MAX_BRW_SIZE, 1 << 20);
 207         npages /= PAGE_SIZE;
 208
 209         /* allocate pages for bulk index read */
 210         OBD_ALLOC(pages, npages * sizeof(*pages));
 211         if (pages == NULL)
 212                 GOTO(out, rc = -ENOMEM);
 213         for (i = 0; i < npages; i++) {
 214                 pages[i] = alloc_page(GFP_NOFS);
 215                 if (pages[i] == NULL)
 216                         GOTO(out, rc = -ENOMEM);
 217         }
 218
 219 repeat:
 220         /* initialize index_info request with FID of global index */
 221         memset(ii, 0, sizeof(*ii));
 222         memcpy(&ii->ii_fid, fid, sizeof(*fid));
 223         ii->ii_magic = IDX_INFO_MAGIC;
 224         ii->ii_flags = II_FL_NOHASH;
 225         ii->ii_count = npages * LU_PAGE_COUNT;
 226         ii->ii_hash_start = start_hash;
 227
 228         /* send bulk request to quota master to read global index */
 229         rc = qsd_fetch_index(env, qsd->qsd_exp, ii, npages, pages, &need_swab);
 230         if (rc) {
 231                 CWARN("%s: failed to fetch index for "DFID". %d\n",
 232                       qsd->qsd_svname, PFID(fid), rc);
 233                 GOTO(out, rc);
 234         }
 235
 236         /* various sanity checks */
 237         if (ii->ii_magic != IDX_INFO_MAGIC) {
 238                 CERROR("%s: invalid magic in index transfer %x != %x\n",
 239                        qsd->qsd_svname, ii->ii_magic, IDX_INFO_MAGIC);
 240                 GOTO(out, rc = -EPROTO);
 241         }
 242         if ((ii->ii_flags & II_FL_VARKEY) != 0)
 243                 CWARN("%s: II_FL_VARKEY is set on index transfer for fid "DFID
 244                       ", it shouldn't be\n", qsd->qsd_svname, PFID(fid));
 245         if ((ii->ii_flags & II_FL_NONUNQ) != 0)
 246                 CWARN("%s: II_FL_NONUNQ is set on index transfer for fid "DFID
 247                       ", it shouldn't be\n", qsd->qsd_svname, PFID(fid));
 248         if (ii->ii_keysize != sizeof(__u64)) {
 249                 CERROR("%s: invalid key size reported on index transfer for "
 250                        "fid "DFID", %u != %u\n", qsd->qsd_svname, PFID(fid),
 251                        ii->ii_keysize, (int)sizeof(__u64));
 252                 GOTO(out, rc = -EPROTO);
 253         }
 254         if (ii->ii_version == 0 && ii->ii_count != 0)
 255                 CWARN("%s: index version for fid "DFID" is 0, but index isn't "
 256                       "empty (%d)\n", qsd->qsd_svname, PFID(fid), ii->ii_count);
 257
 258         CDEBUG(D_QUOTA, "%s: reintegration process for fid "DFID" successfully "
 259                "fetched %s index, count = %d\n", qsd->qsd_svname,
 260                PFID(fid), global ? "global" : "slave", ii->ii_count);
 261
 262         if (start_hash == 0)
 263                 /* record version associated with the first bulk transfer */
 264                 ver = ii->ii_version;
 265
 266         pg_cnt = (ii->ii_count + (LU_PAGE_COUNT) - 1);
 267         pg_cnt >>= PAGE_SHIFT - LU_PAGE_SHIFT;
 268
 269         if (pg_cnt > npages) {
 270                 CERROR("%s: master returned more pages than expected, %u > %u"
 271                        "\n", qsd->qsd_svname, pg_cnt, npages);
 272                 pg_cnt = npages;
 273         }
 274
 275         rc = qsd_reint_entries(env, qqi, ii, global, pages, pg_cnt, need_swab);
 276         if (rc)
 277                 GOTO(out, rc);
 278
 279         if (ii->ii_hash_end != II_END_OFF) {
 280                 start_hash = ii->ii_hash_end;
 281                 goto repeat;
 282         }
 283 out:
 284         if (pages != NULL) {
 285                 for (i = 0; i < npages; i++)
 286                         if (pages[i] != NULL)
 287                                 __free_page(pages[i]);
 288                 OBD_FREE(pages, npages * sizeof(*pages));
 289         }
 290
 291         /* Update index version */
 292         if (rc == 0) {
 293                 rc = qsd_write_version(env, qqi, ver, global);
 294                 if (rc)
 295                         CERROR("%s: write version %llu to "DFID" failed : rc = %d\n",
 296                                qsd->qsd_svname, ver, PFID(fid), rc);
 297         }
 298
 299         RETURN(rc);
 300 }
 301
 302 static int qsd_reconciliation(const struct lu_env *env,
 303                               struct qsd_qtype_info *qqi)
 304 {
 305         struct qsd_thread_info  *qti = qsd_info(env);
 306         struct qsd_instance     *qsd = qqi->qqi_qsd;
 307         const struct dt_it_ops  *iops;
 308         struct dt_it            *it;
 309         struct dt_key           *key;
 310         struct lquota_entry     *lqe;
 311         union lquota_id         *qid = &qti->qti_id;
 312         int                      rc;
 313         ENTRY;
 314
 315         LASSERT(qqi->qqi_glb_obj != NULL);
 316         iops = &qqi->qqi_glb_obj->do_index_ops->dio_it;
 317
 318         it = iops->init(env, qqi->qqi_glb_obj, 0);
 319         if (IS_ERR(it)) {
 320                 CWARN("%s: Initialize it for "DFID" failed. %ld\n",
 321                       qsd->qsd_svname, PFID(&qqi->qqi_fid), PTR_ERR(it));
 322                 RETURN(PTR_ERR(it));
 323         }
 324
 325         rc = iops->load(env, it, 0);
 326         if (rc < 0) {
 327                 CWARN("%s: Load first entry for "DFID" failed. %d\n",
 328                       qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 329                 GOTO(out, rc);
 330         } else if (rc == 0) {
 331                 rc = iops->next(env, it);
 332                 if (rc != 0)
 333                         GOTO(out, rc = (rc < 0) ? rc : 0);
 334         }
 335
 336         do {
 337                 key = iops->key(env, it);
 338                 if (IS_ERR(key)) {
 339                         CWARN("%s: Error key for "DFID". %ld\n",
 340                               qsd->qsd_svname, PFID(&qqi->qqi_fid),
 341                               PTR_ERR(key));
 342                         GOTO(out, rc = PTR_ERR(key));
 343                 }
 344
 345                 /* skip the root user/group */
 346                 if (*((__u64 *)key) == 0)
 347                         goto next;
 348
 349                 qid->qid_uid = *((__u64 *)key);
 350
 351                 lqe = lqe_locate(env, qqi->qqi_site, qid);
 352                 if (IS_ERR(lqe)) {
 353                         CWARN("%s: failed to locate lqe. "DFID", %ld\n",
 354                               qsd->qsd_svname, PFID(&qqi->qqi_fid),
 355                               PTR_ERR(lqe));
 356                         GOTO(out, rc = PTR_ERR(lqe));
 357                 }
 358
 359                 rc = qsd_refresh_usage(env, lqe);
 360                 if (rc) {
 361                         CWARN("%s: failed to get usage. "DFID", %d\n",
 362                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 363                         lqe_putref(lqe);
 364                         GOTO(out, rc);
 365                 }
 366
 367                 rc = qsd_adjust(env, lqe);
 368                 lqe_putref(lqe);
 369                 if (rc) {
 370                         CWARN("%s: failed to report quota. "DFID", %d\n",
 371                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 372                         GOTO(out, rc);
 373                 }
 374 next:
 375                 rc = iops->next(env, it);
 376                 if (rc < 0)
 377                         CWARN("%s: failed to parse index, ->next error:%d "DFID
 378                               "\n", qsd->qsd_svname, rc, PFID(&qqi->qqi_fid));
 379         } while (rc == 0);
 380
 381         /* reach the end */
 382         if (rc > 0)
 383                 rc = 0;
 384 out:
 385         iops->put(env, it);
 386         iops->fini(env, it);
 387         RETURN(rc);
 388 }
 389
 390 static int qsd_connected(struct qsd_instance *qsd)
 391 {
 392         int     connected;
 393
 394         read_lock(&qsd->qsd_lock);
 395         connected = qsd->qsd_exp_valid ? 1 : 0;
 396         read_unlock(&qsd->qsd_lock);
 397
 398         return connected;
 399 }
 400
 401 static int qsd_started(struct qsd_instance *qsd)
 402 {
 403         int     started;
 404
 405         read_lock(&qsd->qsd_lock);
 406         started = qsd->qsd_started ? 1 : 0;
 407         read_unlock(&qsd->qsd_lock);
 408
 409         return started;
 410 }
 411
 412 /*
 413  * Routine executed by the reintegration thread.
 414  */
 415 static int qsd_reint_main(void *args)
 416 {
 417         struct lu_env           *env;
 418         struct qsd_thread_info  *qti;
 419         struct qsd_qtype_info   *qqi = (struct qsd_qtype_info *)args;
 420         struct qsd_instance     *qsd = qqi->qqi_qsd;
 421         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 422         int                      rc;
 423         ENTRY;
 424
 425         CDEBUG(D_QUOTA, "%s: Starting reintegration thread for "DFID"\n",
 426                qsd->qsd_svname, PFID(&qqi->qqi_fid));
 427
 428         qqi_getref(qqi);
 429         lu_ref_add(&qqi->qqi_reference, "reint_thread", thread);
 430
 431         thread_set_flags(thread, SVC_RUNNING);
 432         wake_up(&thread->t_ctl_waitq);
 433
 434         OBD_ALLOC_PTR(env);
 435         if (env == NULL)
 436                 GOTO(out, rc = -ENOMEM);
 437
 438         /* initialize environment */
 439         rc = lu_env_init(env, LCT_DT_THREAD);
 440         if (rc)
 441                 GOTO(out_env, rc);
 442         qti = qsd_info(env);
 443
 444         /* wait for the connection to master established */
 445         wait_event_idle(thread->t_ctl_waitq,
 446                         qsd_connected(qsd) || !thread_is_running(thread));
 447
 448         /* Step 1: enqueue global index lock */
 449         if (!thread_is_running(thread))
 450                 GOTO(out_env_init, rc = 0);
 451
 452         LASSERT(qsd->qsd_exp != NULL);
 453         LASSERT(qqi->qqi_glb_uptodate == 0 || qqi->qqi_slv_uptodate == 0);
 454
 455         memset(&qti->qti_lvb, 0, sizeof(qti->qti_lvb));
 456
 457         read_lock(&qsd->qsd_lock);
 458         /* check whether we already own a global quota lock for this type */
 459         if (lustre_handle_is_used(&qqi->qqi_lockh) &&
 460             ldlm_lock_addref_try(&qqi->qqi_lockh, qsd_glb_einfo.ei_mode) == 0) {
 461                 read_unlock(&qsd->qsd_lock);
 462                 /* force refresh of global & slave index copy */
 463                 qti->qti_lvb.lvb_glb_ver = ~0ULL;
 464                 qti->qti_slv_ver = ~0ULL;
 465         } else {
 466                 /* no valid lock found, let's enqueue a new one */
 467                 read_unlock(&qsd->qsd_lock);
 468
 469                 memset(&qti->qti_body, 0, sizeof(qti->qti_body));
 470                 memcpy(&qti->qti_body.qb_fid, &qqi->qqi_fid,
 471                        sizeof(qqi->qqi_fid));
 472
 473                 rc = qsd_intent_lock(env, qsd->qsd_exp, &qti->qti_body, true,
 474                                      IT_QUOTA_CONN, qsd_reint_completion, qqi,
 475                                      &qti->qti_lvb, (void *)&qti->qti_slv_ver);
 476                 if (rc)
 477                         GOTO(out_env_init, rc);
 478
 479                 CDEBUG(D_QUOTA, "%s: glb_ver:%llu/%llu,slv_ver:%llu/"
 480                        "%llu\n", qsd->qsd_svname,
 481                        qti->qti_lvb.lvb_glb_ver, qqi->qqi_glb_ver,
 482                        qti->qti_slv_ver, qqi->qqi_slv_ver);
 483         }
 484
 485         /* Step 2: reintegrate global index */
 486         if (!thread_is_running(thread))
 487                 GOTO(out_lock, rc = 0);
 488
 489         OBD_FAIL_TIMEOUT(OBD_FAIL_QUOTA_DELAY_REINT, 10);
 490
 491         if (qqi->qqi_glb_ver != qti->qti_lvb.lvb_glb_ver) {
 492                 rc = qsd_reint_index(env, qqi, true);
 493                 if (rc) {
 494                         CWARN("%s: reint global for "DFID" failed. %d\n",
 495                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 496                         GOTO(out_lock, rc);
 497                 }
 498         } else {
 499                 qsd_bump_version(qqi, qqi->qqi_glb_ver, true);
 500         }
 501
 502         /* Step 3: reintegrate slave index */
 503         if (!thread_is_running(thread))
 504                 GOTO(out_lock, rc = 0);
 505
 506         if (qqi->qqi_slv_ver != qti->qti_slv_ver) {
 507                 rc = qsd_reint_index(env, qqi, false);
 508                 if (rc) {
 509                         CWARN("%s: reintegration for "DFID" failed with %d\n",
 510                               qsd->qsd_svname, PFID(&qqi->qqi_slv_fid), rc);
 511                         GOTO(out_lock, rc);
 512                 }
 513         } else {
 514                 qsd_bump_version(qqi, qqi->qqi_slv_ver, false);
 515         }
 516
 517         /* wait for the qsd instance started (target recovery done) */
 518         wait_event_idle(thread->t_ctl_waitq,
 519                         qsd_started(qsd) || !thread_is_running(thread));
 520
 521         if (!thread_is_running(thread))
 522                 GOTO(out_lock, rc = 0);
 523
 524         /* Step 4: start reconciliation for each enforced ID */
 525         rc = qsd_reconciliation(env, qqi);
 526         if (rc)
 527                 CWARN("%s: reconciliation for "DFID" failed with %d\n",
 528                       qsd->qsd_svname, PFID(&qqi->qqi_slv_fid), rc);
 529
 530         EXIT;
 531 out_lock:
 532         ldlm_lock_decref(&qqi->qqi_lockh, qsd_glb_einfo.ei_mode);
 533 out_env_init:
 534         lu_env_fini(env);
 535 out_env:
 536         OBD_FREE_PTR(env);
 537 out:
 538         write_lock(&qsd->qsd_lock);
 539         qqi->qqi_reint = 0;
 540         write_unlock(&qsd->qsd_lock);
 541
 542         thread_set_flags(thread, SVC_STOPPED);
 543         wake_up(&thread->t_ctl_waitq);
 544
 545         lu_ref_del(&qqi->qqi_reference, "reint_thread", thread);
 546         qqi_putref(qqi);
 547
 548         return rc;
 549 }
 550
 551 void qsd_stop_reint_thread(struct qsd_qtype_info *qqi)
 552 {
 553         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 554
 555         if (!thread_is_stopped(thread)) {
 556                 thread_set_flags(thread, SVC_STOPPING);
 557                 wake_up(&thread->t_ctl_waitq);
 558
 559                 wait_event_idle(thread->t_ctl_waitq,
 560                                 thread_is_stopped(thread));
 561         }
 562 }
 563
 564 static int qsd_entry_iter_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
 565                              struct hlist_node *hnode, void *data)
 566 {
 567         struct lquota_entry     *lqe;
 568         int                     *pending = (int *)data;
 569
 570         lqe = hlist_entry(hnode, struct lquota_entry, lqe_hash);
 571         LASSERT(atomic_read(&lqe->lqe_ref) > 0);
 572
 573         lqe_read_lock(lqe);
 574         *pending += lqe->lqe_pending_req;
 575         lqe_read_unlock(lqe);
 576
 577         return 0;
 578 }
 579
 580 static bool qsd_pending_updates(struct qsd_qtype_info *qqi)
 581 {
 582         struct qsd_instance     *qsd = qqi->qqi_qsd;
 583         struct qsd_upd_rec      *upd;
 584         struct lquota_entry     *lqe, *n;
 585         int                      dqacq = 0;
 586         bool                     updates = false;
 587         ENTRY;
 588
 589         /* any pending quota adjust? */
 590         spin_lock(&qsd->qsd_adjust_lock);
 591         list_for_each_entry_safe(lqe, n, &qsd->qsd_adjust_list, lqe_link) {
 592                 if (lqe2qqi(lqe) == qqi) {
 593                         list_del_init(&lqe->lqe_link);
 594                         lqe_putref(lqe);
 595                 }
 596         }
 597         spin_unlock(&qsd->qsd_adjust_lock);
 598
 599         /* any pending updates? */
 600         read_lock(&qsd->qsd_lock);
 601         list_for_each_entry(upd, &qsd->qsd_upd_list, qur_link) {
 602                 if (upd->qur_qqi == qqi) {
 603                         read_unlock(&qsd->qsd_lock);
 604                         CDEBUG(D_QUOTA, "%s: pending %s updates for type:%d.\n",
 605                                qsd->qsd_svname,
 606                                upd->qur_global ? "global" : "slave",
 607                                qqi->qqi_qtype);
 608                         GOTO(out, updates = true);
 609                 }
 610         }
 611         read_unlock(&qsd->qsd_lock);
 612
 613         /* any pending quota request? */
 614         cfs_hash_for_each_safe(qqi->qqi_site->lqs_hash, qsd_entry_iter_cb,
 615                                &dqacq);
 616         if (dqacq) {
 617                 CDEBUG(D_QUOTA, "%s: pending dqacq for type:%d.\n",
 618                        qsd->qsd_svname, qqi->qqi_qtype);
 619                 updates = true;
 620         }
 621         EXIT;
 622 out:
 623         if (updates)
 624                 CERROR("%s: Delaying reintegration for qtype:%d until pending "
 625                        "updates are flushed.\n",
 626                        qsd->qsd_svname, qqi->qqi_qtype);
 627         return updates;
 628 }
 629
 630 int qsd_start_reint_thread(struct qsd_qtype_info *qqi)
 631 {
 632         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 633         struct qsd_instance     *qsd = qqi->qqi_qsd;
 634         struct task_struct      *task;
 635         int                      rc;
 636         char                    *name;
 637         ENTRY;
 638
 639         /* do not try to start a new thread as this can lead to a deadlock */
 640         if (current->flags & (PF_MEMALLOC | PF_KSWAPD))
 641                 RETURN(0);
 642
 643         if (qsd->qsd_dev->dd_rdonly)
 644                 RETURN(0);
 645
 646         /* don't bother to do reintegration when quota isn't enabled */
 647         if (!qsd_type_enabled(qsd, qqi->qqi_qtype))
 648                 RETURN(0);
 649
 650         if (qqi->qqi_acct_failed)
 651                 /* no space accounting support, can't enable enforcement */
 652                 RETURN(0);
 653
 654         /* check if the reintegration has already started or finished */
 655         write_lock(&qsd->qsd_lock);
 656
 657         if ((qqi->qqi_glb_uptodate && qqi->qqi_slv_uptodate) ||
 658              qqi->qqi_reint || qsd->qsd_stopping) {
 659                 write_unlock(&qsd->qsd_lock);
 660                 RETURN(0);
 661         }
 662         qqi->qqi_reint = 1;
 663
 664         write_unlock(&qsd->qsd_lock);
 665
 666         /* there could be some unfinished global or index entry updates
 667          * (very unlikely), to avoid them messing up with the reint
 668          * procedure, we just return and try to re-start reint later. */
 669         if (qsd_pending_updates(qqi)) {
 670                 write_lock(&qsd->qsd_lock);
 671                 qqi->qqi_reint = 0;
 672                 write_unlock(&qsd->qsd_lock);
 673                 RETURN(0);
 674         }
 675
 676         OBD_ALLOC(name, MTI_NAME_MAXLEN);
 677         if (name == NULL)
 678                 RETURN(-ENOMEM);
 679
 680         snprintf(name, MTI_NAME_MAXLEN, "qsd_reint_%d.%s",
 681                  qqi->qqi_qtype, qsd->qsd_svname);
 682
 683         task = kthread_run(qsd_reint_main, qqi, name);
 684         OBD_FREE(name, MTI_NAME_MAXLEN);
 685
 686         if (IS_ERR(task)) {
 687                 rc = PTR_ERR(task);
 688                 thread_set_flags(thread, SVC_STOPPED);
 689                 write_lock(&qsd->qsd_lock);
 690                 qqi->qqi_reint = 0;
 691                 write_unlock(&qsd->qsd_lock);
 692                 RETURN(rc);
 693         }
 694
 695         wait_event_idle(thread->t_ctl_waitq,
 696                         thread_is_running(thread) || thread_is_stopped(thread));
 697         RETURN(0);
 698 }