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 <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:"LPU64", slv fid:"DFID", slv ver:"LPU64"\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         lqe_putref(lqe);
  93         RETURN(rc);
  94 }
  95
  96 static int qsd_reint_entries(const struct lu_env *env,
  97                              struct qsd_qtype_info *qqi,
  98                              struct idx_info *ii, bool global,
  99                              struct page **pages,
 100                              unsigned int npages, bool need_swab)
 101 {
 102         struct qsd_thread_info  *qti = qsd_info(env);
 103         struct qsd_instance     *qsd = qqi->qqi_qsd;
 104         union lquota_id         *qid = &qti->qti_id;
 105         int                      i, j, k, size;
 106         int                      rc = 0;
 107         ENTRY;
 108
 109         CDEBUG(D_QUOTA, "%s: processing %d pages for %s index\n",
 110                qsd->qsd_svname, npages, global ? "global" : "slave");
 111
 112         /* sanity check on the record size */
 113         if ((global && ii->ii_recsize != sizeof(struct lquota_glb_rec)) ||
 114             (!global && ii->ii_recsize != sizeof(struct lquota_slv_rec))) {
 115                 CERROR("%s: invalid record size (%d) for %s index\n",
 116                        qsd->qsd_svname, ii->ii_recsize,
 117                        global ? "global" : "slave");
 118                 RETURN(-EINVAL);
 119         }
 120
 121         size = ii->ii_recsize + ii->ii_keysize;
 122
 123         for (i = 0; i < npages; i++) {
 124                 union lu_page   *lip = kmap(pages[i]);
 125
 126                 for (j = 0; j < LU_PAGE_COUNT; j++) {
 127                         if (need_swab)
 128                                 /* swab header */
 129                                 lustre_swab_lip_header(&lip->lp_idx);
 130
 131                         if (lip->lp_idx.lip_magic != LIP_MAGIC) {
 132                                 CERROR("%s: invalid magic (%x != %x) for page "
 133                                        "%d/%d while transferring %s index\n",
 134                                        qsd->qsd_svname, lip->lp_idx.lip_magic,
 135                                        LIP_MAGIC, i + 1, npages,
 136                                        global ? "global" : "slave");
 137                                 GOTO(out, rc = -EINVAL);
 138                         }
 139
 140                         CDEBUG(D_QUOTA, "%s: processing page %d/%d with %d "
 141                                "entries for %s index\n", qsd->qsd_svname, i + 1,
 142                                npages, lip->lp_idx.lip_nr,
 143                                global ? "global" : "slave");
 144
 145                         for (k = 0; k < lip->lp_idx.lip_nr; k++) {
 146                                 char *entry;
 147
 148                                 entry = lip->lp_idx.lip_entries + k * size;
 149                                 memcpy(qid, entry, ii->ii_keysize); /* key */
 150                                 entry += ii->ii_keysize;            /* value */
 151
 152                                 if (need_swab) {
 153                                         int offset = 0;
 154
 155                                         /* swab key */
 156                                         __swab64s(&qid->qid_uid);
 157                                         /* quota records only include 64-bit
 158                                          * fields */
 159                                         while (offset < ii->ii_recsize) {
 160                                                 __swab64s((__u64 *)
 161                                                               (entry + offset));
 162                                                 offset += sizeof(__u64);
 163                                         }
 164                                 }
 165
 166                                 rc = qsd_reint_qid(env, qqi, global, qid,
 167                                                    (void *)entry);
 168                                 if (rc)
 169                                         GOTO(out, rc);
 170                         }
 171                         lip++;
 172                 }
 173 out:
 174                 kunmap(pages[i]);
 175                 if (rc)
 176                         break;
 177         }
 178         RETURN(rc);
 179 }
 180
 181 static int qsd_reint_index(const struct lu_env *env, struct qsd_qtype_info *qqi,
 182                            bool global)
 183 {
 184         struct qsd_thread_info  *qti = qsd_info(env);
 185         struct qsd_instance     *qsd = qqi->qqi_qsd;
 186         struct idx_info         *ii = &qti->qti_ii;
 187         struct lu_fid           *fid;
 188         struct page             **pages = NULL;
 189         unsigned int             npages, pg_cnt;
 190         __u64                    start_hash = 0, ver = 0;
 191         bool                     need_swab = false;
 192         int                      i, rc;
 193         ENTRY;
 194
 195         fid = global ? &qqi->qqi_fid : &qqi->qqi_slv_fid;
 196
 197         /* let's do a 1MB bulk */
 198         npages = min_t(unsigned int, OFD_MAX_BRW_SIZE, 1 << 20);
 199         npages /= PAGE_SIZE;
 200
 201         /* allocate pages for bulk index read */
 202         OBD_ALLOC(pages, npages * sizeof(*pages));
 203         if (pages == NULL)
 204                 GOTO(out, rc = -ENOMEM);
 205         for (i = 0; i < npages; i++) {
 206                 pages[i] = alloc_page(GFP_NOFS);
 207                 if (pages[i] == NULL)
 208                         GOTO(out, rc = -ENOMEM);
 209         }
 210
 211 repeat:
 212         /* initialize index_info request with FID of global index */
 213         memset(ii, 0, sizeof(*ii));
 214         memcpy(&ii->ii_fid, fid, sizeof(*fid));
 215         ii->ii_magic = IDX_INFO_MAGIC;
 216         ii->ii_flags = II_FL_NOHASH;
 217         ii->ii_count = npages * LU_PAGE_COUNT;
 218         ii->ii_hash_start = start_hash;
 219
 220         /* send bulk request to quota master to read global index */
 221         rc = qsd_fetch_index(env, qsd->qsd_exp, ii, npages, pages, &need_swab);
 222         if (rc) {
 223                 CWARN("%s: failed to fetch index for "DFID". %d\n",
 224                       qsd->qsd_svname, PFID(fid), rc);
 225                 GOTO(out, rc);
 226         }
 227
 228         /* various sanity checks */
 229         if (ii->ii_magic != IDX_INFO_MAGIC) {
 230                 CERROR("%s: invalid magic in index transfer %x != %x\n",
 231                        qsd->qsd_svname, ii->ii_magic, IDX_INFO_MAGIC);
 232                 GOTO(out, rc = -EPROTO);
 233         }
 234         if ((ii->ii_flags & II_FL_VARKEY) != 0)
 235                 CWARN("%s: II_FL_VARKEY is set on index transfer for fid "DFID
 236                       ", it shouldn't be\n", qsd->qsd_svname, PFID(fid));
 237         if ((ii->ii_flags & II_FL_NONUNQ) != 0)
 238                 CWARN("%s: II_FL_NONUNQ is set on index transfer for fid "DFID
 239                       ", it shouldn't be\n", qsd->qsd_svname, PFID(fid));
 240         if (ii->ii_keysize != sizeof(__u64)) {
 241                 CERROR("%s: invalid key size reported on index transfer for "
 242                        "fid "DFID", %u != %u\n", qsd->qsd_svname, PFID(fid),
 243                        ii->ii_keysize, (int)sizeof(__u64));
 244                 GOTO(out, rc = -EPROTO);
 245         }
 246         if (ii->ii_version == 0 && ii->ii_count != 0)
 247                 CWARN("%s: index version for fid "DFID" is 0, but index isn't "
 248                       "empty (%d)\n", qsd->qsd_svname, PFID(fid), ii->ii_count);
 249
 250         CDEBUG(D_QUOTA, "%s: reintegration process for fid "DFID" successfully "
 251                "fetched %s index, count = %d\n", qsd->qsd_svname,
 252                PFID(fid), global ? "global" : "slave", ii->ii_count);
 253
 254         if (start_hash == 0)
 255                 /* record version associated with the first bulk transfer */
 256                 ver = ii->ii_version;
 257
 258         pg_cnt = (ii->ii_count + (LU_PAGE_COUNT) - 1);
 259         pg_cnt >>= PAGE_SHIFT - LU_PAGE_SHIFT;
 260
 261         if (pg_cnt > npages) {
 262                 CERROR("%s: master returned more pages than expected, %u > %u"
 263                        "\n", qsd->qsd_svname, pg_cnt, npages);
 264                 pg_cnt = npages;
 265         }
 266
 267         rc = qsd_reint_entries(env, qqi, ii, global, pages, pg_cnt, need_swab);
 268         if (rc)
 269                 GOTO(out, rc);
 270
 271         if (ii->ii_hash_end != II_END_OFF) {
 272                 start_hash = ii->ii_hash_end;
 273                 goto repeat;
 274         }
 275 out:
 276         if (pages != NULL) {
 277                 for (i = 0; i < npages; i++)
 278                         if (pages[i] != NULL)
 279                                 __free_page(pages[i]);
 280                 OBD_FREE(pages, npages * sizeof(*pages));
 281         }
 282
 283         /* Update index version */
 284         if (rc == 0) {
 285                 rc = qsd_write_version(env, qqi, ver, global);
 286                 if (rc)
 287                         CERROR("%s: write version "LPU64" to "DFID" failed. "
 288                                "%d\n", qsd->qsd_svname, ver, PFID(fid), rc);
 289         }
 290
 291         RETURN(rc);
 292 }
 293
 294 static int qsd_reconciliation(const struct lu_env *env,
 295                               struct qsd_qtype_info *qqi)
 296 {
 297         struct qsd_thread_info  *qti = qsd_info(env);
 298         struct qsd_instance     *qsd = qqi->qqi_qsd;
 299         const struct dt_it_ops  *iops;
 300         struct dt_it            *it;
 301         struct dt_key           *key;
 302         struct lquota_entry     *lqe;
 303         union lquota_id         *qid = &qti->qti_id;
 304         int                      rc;
 305         ENTRY;
 306
 307         LASSERT(qqi->qqi_glb_obj != NULL);
 308         iops = &qqi->qqi_glb_obj->do_index_ops->dio_it;
 309
 310         it = iops->init(env, qqi->qqi_glb_obj, 0);
 311         if (IS_ERR(it)) {
 312                 CWARN("%s: Initialize it for "DFID" failed. %ld\n",
 313                       qsd->qsd_svname, PFID(&qqi->qqi_fid), PTR_ERR(it));
 314                 RETURN(PTR_ERR(it));
 315         }
 316
 317         rc = iops->load(env, it, 0);
 318         if (rc < 0) {
 319                 CWARN("%s: Load first entry for "DFID" failed. %d\n",
 320                       qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 321                 GOTO(out, rc);
 322         } else if (rc == 0) {
 323                 rc = iops->next(env, it);
 324                 if (rc != 0)
 325                         GOTO(out, rc = (rc < 0) ? rc : 0);
 326         }
 327
 328         do {
 329                 key = iops->key(env, it);
 330                 if (IS_ERR(key)) {
 331                         CWARN("%s: Error key for "DFID". %ld\n",
 332                               qsd->qsd_svname, PFID(&qqi->qqi_fid),
 333                               PTR_ERR(key));
 334                         GOTO(out, rc = PTR_ERR(key));
 335                 }
 336
 337                 /* skip the root user/group */
 338                 if (*((__u64 *)key) == 0)
 339                         goto next;
 340
 341                 qid->qid_uid = *((__u64 *)key);
 342
 343                 lqe = lqe_locate(env, qqi->qqi_site, qid);
 344                 if (IS_ERR(lqe)) {
 345                         CWARN("%s: failed to locate lqe. "DFID", %ld\n",
 346                               qsd->qsd_svname, PFID(&qqi->qqi_fid),
 347                               PTR_ERR(lqe));
 348                         GOTO(out, rc = PTR_ERR(lqe));
 349                 }
 350
 351                 rc = qsd_refresh_usage(env, lqe);
 352                 if (rc) {
 353                         CWARN("%s: failed to get usage. "DFID", %d\n",
 354                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 355                         lqe_putref(lqe);
 356                         GOTO(out, rc);
 357                 }
 358
 359                 rc = qsd_adjust(env, lqe);
 360                 lqe_putref(lqe);
 361                 if (rc) {
 362                         CWARN("%s: failed to report quota. "DFID", %d\n",
 363                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 364                         GOTO(out, rc);
 365                 }
 366 next:
 367                 rc = iops->next(env, it);
 368                 if (rc < 0)
 369                         CWARN("%s: failed to parse index, ->next error:%d "DFID
 370                               "\n", qsd->qsd_svname, rc, PFID(&qqi->qqi_fid));
 371         } while (rc == 0);
 372
 373         /* reach the end */
 374         if (rc > 0)
 375                 rc = 0;
 376 out:
 377         iops->put(env, it);
 378         iops->fini(env, it);
 379         RETURN(rc);
 380 }
 381
 382 static int qsd_connected(struct qsd_instance *qsd)
 383 {
 384         int     connected;
 385
 386         read_lock(&qsd->qsd_lock);
 387         connected = qsd->qsd_exp_valid ? 1 : 0;
 388         read_unlock(&qsd->qsd_lock);
 389
 390         return connected;
 391 }
 392
 393 static int qsd_started(struct qsd_instance *qsd)
 394 {
 395         int     started;
 396
 397         read_lock(&qsd->qsd_lock);
 398         started = qsd->qsd_started ? 1 : 0;
 399         read_unlock(&qsd->qsd_lock);
 400
 401         return started;
 402 }
 403
 404 /*
 405  * Routine executed by the reintegration thread.
 406  */
 407 static int qsd_reint_main(void *args)
 408 {
 409         struct lu_env           *env;
 410         struct qsd_thread_info  *qti;
 411         struct qsd_qtype_info   *qqi = (struct qsd_qtype_info *)args;
 412         struct qsd_instance     *qsd = qqi->qqi_qsd;
 413         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 414         struct l_wait_info       lwi = { 0 };
 415         int                      rc;
 416         ENTRY;
 417
 418         CDEBUG(D_QUOTA, "%s: Starting reintegration thread for "DFID"\n",
 419                qsd->qsd_svname, PFID(&qqi->qqi_fid));
 420
 421         qqi_getref(qqi);
 422         lu_ref_add(&qqi->qqi_reference, "reint_thread", thread);
 423
 424         thread_set_flags(thread, SVC_RUNNING);
 425         wake_up(&thread->t_ctl_waitq);
 426
 427         OBD_ALLOC_PTR(env);
 428         if (env == NULL)
 429                 GOTO(out, rc = -ENOMEM);
 430
 431         /* initialize environment */
 432         rc = lu_env_init(env, LCT_DT_THREAD);
 433         if (rc)
 434                 GOTO(out_env, rc);
 435         qti = qsd_info(env);
 436
 437         /* wait for the connection to master established */
 438         l_wait_event(thread->t_ctl_waitq,
 439                      qsd_connected(qsd) || !thread_is_running(thread), &lwi);
 440
 441         /* Step 1: enqueue global index lock */
 442         if (!thread_is_running(thread))
 443                 GOTO(out_env_init, rc = 0);
 444
 445         LASSERT(qsd->qsd_exp != NULL);
 446         LASSERT(qqi->qqi_glb_uptodate == 0 || qqi->qqi_slv_uptodate == 0);
 447
 448         memset(&qti->qti_lvb, 0, sizeof(qti->qti_lvb));
 449
 450         read_lock(&qsd->qsd_lock);
 451         /* check whether we already own a global quota lock for this type */
 452         if (lustre_handle_is_used(&qqi->qqi_lockh) &&
 453             ldlm_lock_addref_try(&qqi->qqi_lockh, qsd_glb_einfo.ei_mode) == 0) {
 454                 read_unlock(&qsd->qsd_lock);
 455                 /* force refresh of global & slave index copy */
 456                 qti->qti_lvb.lvb_glb_ver = ~0ULL;
 457                 qti->qti_slv_ver = ~0ULL;
 458         } else {
 459                 /* no valid lock found, let's enqueue a new one */
 460                 read_unlock(&qsd->qsd_lock);
 461
 462                 memset(&qti->qti_body, 0, sizeof(qti->qti_body));
 463                 memcpy(&qti->qti_body.qb_fid, &qqi->qqi_fid,
 464                        sizeof(qqi->qqi_fid));
 465
 466                 rc = qsd_intent_lock(env, qsd->qsd_exp, &qti->qti_body, true,
 467                                      IT_QUOTA_CONN, qsd_reint_completion, qqi,
 468                                      &qti->qti_lvb, (void *)&qti->qti_slv_ver);
 469                 if (rc)
 470                         GOTO(out_env_init, rc);
 471
 472                 CDEBUG(D_QUOTA, "%s: glb_ver:"LPU64"/"LPU64",slv_ver:"LPU64"/"
 473                        LPU64"\n", qsd->qsd_svname,
 474                        qti->qti_lvb.lvb_glb_ver, qqi->qqi_glb_ver,
 475                        qti->qti_slv_ver, qqi->qqi_slv_ver);
 476         }
 477
 478         /* Step 2: reintegrate global index */
 479         if (!thread_is_running(thread))
 480                 GOTO(out_lock, rc = 0);
 481
 482         OBD_FAIL_TIMEOUT(OBD_FAIL_QUOTA_DELAY_REINT, 10);
 483
 484         if (qqi->qqi_glb_ver != qti->qti_lvb.lvb_glb_ver) {
 485                 rc = qsd_reint_index(env, qqi, true);
 486                 if (rc) {
 487                         CWARN("%s: reint global for "DFID" failed. %d\n",
 488                               qsd->qsd_svname, PFID(&qqi->qqi_fid), rc);
 489                         GOTO(out_lock, rc);
 490                 }
 491         } else {
 492                 qsd_bump_version(qqi, qqi->qqi_glb_ver, true);
 493         }
 494
 495         /* Step 3: reintegrate slave index */
 496         if (!thread_is_running(thread))
 497                 GOTO(out_lock, rc = 0);
 498
 499         if (qqi->qqi_slv_ver != qti->qti_slv_ver) {
 500                 rc = qsd_reint_index(env, qqi, false);
 501                 if (rc) {
 502                         CWARN("%s: reintegration for "DFID" failed with %d\n",
 503                               qsd->qsd_svname, PFID(&qqi->qqi_slv_fid), rc);
 504                         GOTO(out_lock, rc);
 505                 }
 506         } else {
 507                 qsd_bump_version(qqi, qqi->qqi_slv_ver, false);
 508         }
 509
 510         /* wait for the qsd instance started (target recovery done) */
 511         l_wait_event(thread->t_ctl_waitq,
 512                      qsd_started(qsd) || !thread_is_running(thread), &lwi);
 513
 514         if (!thread_is_running(thread))
 515                 GOTO(out_lock, rc = 0);
 516
 517         /* Step 4: start reconciliation for each enforced ID */
 518         rc = qsd_reconciliation(env, qqi);
 519         if (rc)
 520                 CWARN("%s: reconciliation for "DFID" failed with %d\n",
 521                       qsd->qsd_svname, PFID(&qqi->qqi_slv_fid), rc);
 522
 523         EXIT;
 524 out_lock:
 525         ldlm_lock_decref(&qqi->qqi_lockh, qsd_glb_einfo.ei_mode);
 526 out_env_init:
 527         lu_env_fini(env);
 528 out_env:
 529         OBD_FREE_PTR(env);
 530 out:
 531         write_lock(&qsd->qsd_lock);
 532         qqi->qqi_reint = 0;
 533         write_unlock(&qsd->qsd_lock);
 534
 535         thread_set_flags(thread, SVC_STOPPED);
 536         wake_up(&thread->t_ctl_waitq);
 537
 538         lu_ref_del(&qqi->qqi_reference, "reint_thread", thread);
 539         qqi_putref(qqi);
 540
 541         return rc;
 542 }
 543
 544 void qsd_stop_reint_thread(struct qsd_qtype_info *qqi)
 545 {
 546         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 547         struct l_wait_info       lwi = { 0 };
 548
 549         if (!thread_is_stopped(thread)) {
 550                 thread_set_flags(thread, SVC_STOPPING);
 551                 wake_up(&thread->t_ctl_waitq);
 552
 553                 l_wait_event(thread->t_ctl_waitq,
 554                              thread_is_stopped(thread), &lwi);
 555         }
 556 }
 557
 558 static int qsd_entry_iter_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
 559                              struct hlist_node *hnode, void *data)
 560 {
 561         struct lquota_entry     *lqe;
 562         int                     *pending = (int *)data;
 563
 564         lqe = hlist_entry(hnode, struct lquota_entry, lqe_hash);
 565         LASSERT(atomic_read(&lqe->lqe_ref) > 0);
 566
 567         lqe_read_lock(lqe);
 568         *pending += lqe->lqe_pending_req;
 569         lqe_read_unlock(lqe);
 570
 571         return 0;
 572 }
 573
 574 static bool qsd_pending_updates(struct qsd_qtype_info *qqi)
 575 {
 576         struct qsd_instance     *qsd = qqi->qqi_qsd;
 577         struct qsd_upd_rec      *upd;
 578         struct lquota_entry     *lqe, *n;
 579         int                      dqacq = 0;
 580         bool                     updates = false;
 581         ENTRY;
 582
 583         /* any pending quota adjust? */
 584         spin_lock(&qsd->qsd_adjust_lock);
 585         list_for_each_entry_safe(lqe, n, &qsd->qsd_adjust_list, lqe_link) {
 586                 if (lqe2qqi(lqe) == qqi) {
 587                         list_del_init(&lqe->lqe_link);
 588                         lqe_putref(lqe);
 589                 }
 590         }
 591         spin_unlock(&qsd->qsd_adjust_lock);
 592
 593         /* any pending updates? */
 594         read_lock(&qsd->qsd_lock);
 595         list_for_each_entry(upd, &qsd->qsd_upd_list, qur_link) {
 596                 if (upd->qur_qqi == qqi) {
 597                         read_unlock(&qsd->qsd_lock);
 598                         CDEBUG(D_QUOTA, "%s: pending %s updates for type:%d.\n",
 599                                qsd->qsd_svname,
 600                                upd->qur_global ? "global" : "slave",
 601                                qqi->qqi_qtype);
 602                         GOTO(out, updates = true);
 603                 }
 604         }
 605         read_unlock(&qsd->qsd_lock);
 606
 607         /* any pending quota request? */
 608         cfs_hash_for_each_safe(qqi->qqi_site->lqs_hash, qsd_entry_iter_cb,
 609                                &dqacq);
 610         if (dqacq) {
 611                 CDEBUG(D_QUOTA, "%s: pending dqacq for type:%d.\n",
 612                        qsd->qsd_svname, qqi->qqi_qtype);
 613                 updates = true;
 614         }
 615         EXIT;
 616 out:
 617         if (updates)
 618                 CERROR("%s: Delaying reintegration for qtype:%d until pending "
 619                        "updates are flushed.\n",
 620                        qsd->qsd_svname, qqi->qqi_qtype);
 621         return updates;
 622 }
 623
 624 int qsd_start_reint_thread(struct qsd_qtype_info *qqi)
 625 {
 626         struct ptlrpc_thread    *thread = &qqi->qqi_reint_thread;
 627         struct qsd_instance     *qsd = qqi->qqi_qsd;
 628         struct l_wait_info       lwi = { 0 };
 629         struct task_struct      *task;
 630         int                      rc;
 631         char                    *name;
 632         ENTRY;
 633
 634         /* don't bother to do reintegration when quota isn't enabled */
 635         if (!qsd_type_enabled(qsd, qqi->qqi_qtype))
 636                 RETURN(0);
 637
 638         if (qsd->qsd_acct_failed)
 639                 /* no space accounting support, can't enable enforcement */
 640                 RETURN(0);
 641
 642         /* check if the reintegration has already started or finished */
 643         write_lock(&qsd->qsd_lock);
 644
 645         if ((qqi->qqi_glb_uptodate && qqi->qqi_slv_uptodate) ||
 646              qqi->qqi_reint || qsd->qsd_stopping) {
 647                 write_unlock(&qsd->qsd_lock);
 648                 RETURN(0);
 649         }
 650         qqi->qqi_reint = 1;
 651
 652         write_unlock(&qsd->qsd_lock);
 653
 654         /* there could be some unfinished global or index entry updates
 655          * (very unlikely), to avoid them messing up with the reint
 656          * procedure, we just return and try to re-start reint later. */
 657         if (qsd_pending_updates(qqi)) {
 658                 write_lock(&qsd->qsd_lock);
 659                 qqi->qqi_reint = 0;
 660                 write_unlock(&qsd->qsd_lock);
 661                 RETURN(0);
 662         }
 663
 664         OBD_ALLOC(name, MTI_NAME_MAXLEN);
 665         if (name == NULL)
 666                 RETURN(-ENOMEM);
 667
 668         snprintf(name, MTI_NAME_MAXLEN, "qsd_reint_%d.%s",
 669                  qqi->qqi_qtype, qsd->qsd_svname);
 670
 671         task = kthread_run(qsd_reint_main, qqi, name);
 672         OBD_FREE(name, MTI_NAME_MAXLEN);
 673
 674         if (IS_ERR(task)) {
 675                 rc = PTR_ERR(task);
 676                 thread_set_flags(thread, SVC_STOPPED);
 677                 write_lock(&qsd->qsd_lock);
 678                 qqi->qqi_reint = 0;
 679                 write_unlock(&qsd->qsd_lock);
 680                 RETURN(rc);
 681         }
 682
 683         l_wait_event(thread->t_ctl_waitq,
 684                      thread_is_running(thread) || thread_is_stopped(thread),
 685                      &lwi);
 686         RETURN(0);
 687 }