lustre/quota/qsd_handler.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 "qsd_internal.h"
  34
  35 /**
  36  * helper function bumping lqe_pending_req if there is no quota request in
  37  * flight for the lquota entry \a lqe. Otherwise, EBUSY is returned.
  38  */
  39 static inline int qsd_request_enter(struct lquota_entry *lqe)
  40 {
  41         /* is there already a quota request in flight? */
  42         if (lqe->lqe_pending_req != 0) {
  43                 LQUOTA_DEBUG(lqe, "already a request in flight");
  44                 return -EBUSY;
  45         }
  46
  47         if (lqe->lqe_pending_rel != 0) {
  48                 LQUOTA_ERROR(lqe, "no request in flight with pending_rel=%llu",
  49                              lqe->lqe_pending_rel);
  50                 LBUG();
  51         }
  52
  53         lqe->lqe_pending_req++;
  54         return 0;
  55 }
  56
  57 /**
  58  * Companion of qsd_request_enter() dropping lqe_pending_req to 0.
  59  */
  60 static inline void qsd_request_exit(struct lquota_entry *lqe)
  61 {
  62         if (lqe->lqe_pending_req != 1) {
  63                 LQUOTA_ERROR(lqe, "lqe_pending_req != 1!!!");
  64                 LBUG();
  65         }
  66         lqe->lqe_pending_req--;
  67         lqe->lqe_pending_rel = 0;
  68         wake_up(&lqe->lqe_waiters);
  69 }
  70
  71 /**
  72  * Check whether a qsd instance is all set to send quota request to master.
  73  * This includes checking whether:
  74  * - the connection to master is set up and usable,
  75  * - the qsd isn't stopping
  76  * - reintegration has been successfully completed and all indexes are
  77  *   up-to-date
  78  *
  79  * \param lqe - is the lquota entry for which we would like to send an quota
  80  *              request
  81  * \param lockh - is the remote handle of the global lock returned on success
  82  *
  83  * \retval 0 on success, appropriate error on failure
  84  */
  85 static int qsd_ready(struct lquota_entry *lqe, struct lustre_handle *lockh)
  86 {
  87         struct qsd_qtype_info   *qqi = lqe2qqi(lqe);
  88         struct qsd_instance     *qsd = qqi->qqi_qsd;
  89         struct obd_import       *imp = NULL;
  90         struct ldlm_lock        *lock;
  91         ENTRY;
  92
  93         read_lock(&qsd->qsd_lock);
  94         /* is the qsd about to shut down? */
  95         if (qsd->qsd_stopping) {
  96                 read_unlock(&qsd->qsd_lock);
  97                 LQUOTA_DEBUG(lqe, "dropping quota req since qsd is stopping");
  98                 /* Target is about to shut down, client will retry */
  99                 RETURN(-EINPROGRESS);
 100         }
 101
 102         /* is the connection to the quota master ready? */
 103         if (qsd->qsd_exp_valid)
 104                 imp = class_exp2cliimp(qsd->qsd_exp);
 105         if (imp == NULL || imp->imp_invalid) {
 106                 read_unlock(&qsd->qsd_lock);
 107                 LQUOTA_DEBUG(lqe, "connection to master not ready");
 108                 RETURN(-ENOTCONN);
 109         }
 110
 111         /* In most case, reintegration must have been triggered (when enable
 112          * quota or on OST start), however, in rare race condition (enabling
 113          * quota when starting OSTs), we might miss triggering reintegration
 114          * for some qqi.
 115          *
 116          * If the previous reintegration failed for some reason, we'll
 117          * re-trigger it here as well. */
 118         if (!qqi->qqi_glb_uptodate || !qqi->qqi_slv_uptodate) {
 119                 read_unlock(&qsd->qsd_lock);
 120                 LQUOTA_DEBUG(lqe, "not up-to-date, dropping request and "
 121                              "kicking off reintegration");
 122                 qsd_start_reint_thread(qqi);
 123                 RETURN(-EINPROGRESS);
 124         }
 125
 126         /* Fill the remote global lock handle, master will check this handle
 127          * to see if the slave is sending request with stale lock */
 128         lustre_handle_copy(lockh, &qqi->qqi_lockh);
 129         read_unlock(&qsd->qsd_lock);
 130
 131         if (!lustre_handle_is_used(lockh))
 132                 RETURN(-ENOLCK);
 133
 134         lock = ldlm_handle2lock(lockh);
 135         if (lock == NULL)
 136                 RETURN(-ENOLCK);
 137
 138         /* return remote lock handle to be packed in quota request */
 139         lustre_handle_copy(lockh, &lock->l_remote_handle);
 140         LDLM_LOCK_PUT(lock);
 141
 142         RETURN(0);
 143 }
 144
 145 /**
 146  * Check whether any quota space adjustment (pre-acquire/release/report) is
 147  * needed for a given quota ID. If a non-null \a qbody is passed, then the
 148  * \a qbody structure (qb_count/flags/usage) is filled with appropriate data
 149  * to be packed in the quota request.
 150  *
 151  * \param lqe   - is the lquota entry for which we would like to adjust quota
 152  *                space.
 153  * \param qbody - is the quota body to fill, if not NULL.
 154  *
 155  * \retval true  - space adjustment is required and \a qbody is filled, if not
 156  *                 NULL
 157  * \retval false - no space adjustment required
 158  */
 159 static bool qsd_calc_adjust(struct lquota_entry *lqe, struct quota_body *qbody)
 160 {
 161         __u64   usage, granted;
 162         ENTRY;
 163
 164         usage   = lqe->lqe_usage;
 165         usage  += lqe->lqe_pending_write + lqe->lqe_waiting_write;
 166         granted = lqe->lqe_granted;
 167
 168         if (qbody != NULL)
 169                 qbody->qb_flags = 0;
 170
 171         if (!lqe->lqe_enforced) {
 172                 /* quota not enforced any more for this ID */
 173                 if (granted != 0) {
 174                         /* release all quota space unconditionally */
 175                         LQUOTA_DEBUG(lqe, "not enforced, releasing all space");
 176                         if (qbody != NULL) {
 177                                 qbody->qb_count = granted;
 178                                 qbody->qb_flags = QUOTA_DQACQ_FL_REL;
 179                         }
 180                         RETURN(true);
 181                 }
 182                 RETURN(false);
 183         }
 184
 185         if (!lustre_handle_is_used(&lqe->lqe_lockh)) {
 186                 /* No valid per-ID lock
 187                  * When reporting quota (during reintegration or on setquota
 188                  * glimpse), we should release granted space if usage is 0.
 189                  * Otherwise, if the usage is less than granted, we need to
 190                  * acquire the per-ID lock to make sure the unused grant can be
 191                  * reclaimed by per-ID lock glimpse. */
 192                 if (usage == 0) {
 193                         /* no on-disk usage and no outstanding activity, release
 194                          * space */
 195                         if (granted != 0) {
 196                                 LQUOTA_DEBUG(lqe, "no usage, releasing all "
 197                                              "space");
 198                                 if (qbody != NULL) {
 199                                         qbody->qb_count = granted;
 200                                         qbody->qb_flags = QUOTA_DQACQ_FL_REL;
 201                                 }
 202                                 RETURN(true);
 203                         }
 204                         LQUOTA_DEBUG(lqe, "no usage + no granted, nothing to "
 205                                      "do");
 206                         RETURN(false);
 207                 }
 208
 209                 if (lqe->lqe_usage < lqe->lqe_granted) {
 210                         /* holding quota space w/o any lock, enqueue per-ID lock
 211                          * again */
 212                         LQUOTA_DEBUG(lqe, "(re)acquiring per-ID lock");
 213                         if (qbody != NULL) {
 214                                 qbody->qb_count = 0;
 215                                 qbody->qb_flags = QUOTA_DQACQ_FL_ACQ;
 216                         }
 217                         RETURN(true);
 218                 }
 219
 220                 if (lqe->lqe_usage > lqe->lqe_granted) {
 221                         /* quota overrun, report usage */
 222                         LQUOTA_DEBUG(lqe, "overrun, reporting usage");
 223                         if (qbody != NULL) {
 224                                 qbody->qb_usage = lqe->lqe_usage;
 225                                 qbody->qb_flags = QUOTA_DQACQ_FL_REPORT;
 226                         }
 227                         RETURN(true);
 228                 }
 229                 LQUOTA_DEBUG(lqe, "granted matches usage, nothing to do");
 230                 RETURN(false);
 231         }
 232
 233         /* valid per-ID lock
 234          * Apply good old quota qunit adjustment logic which has been around
 235          * since lustre 1.4:
 236          * 1. revoke all extra grant
 237          */
 238         if (lqe->lqe_revoke) {
 239                 lqe->lqe_revoke = 0;
 240
 241                 LQUOTA_DEBUG(lqe, "revoke pre-acquired quota: %llu - %llu\n",
 242                              granted, usage);
 243                 qbody->qb_count = granted - usage;
 244                 qbody->qb_flags = QUOTA_DQACQ_FL_REL;
 245                 RETURN(true);
 246         }
 247
 248         /* 2. release spare quota space? */
 249         if (granted > usage + lqe->lqe_qunit) {
 250                 /* pre-release quota space */
 251                 if (qbody == NULL)
 252                         RETURN(true);
 253                 qbody->qb_count = granted - usage;
 254                 /* if usage == 0, release all granted space */
 255                 if (usage) {
 256                         /* try to keep one qunit of quota space */
 257                         qbody->qb_count -= lqe->lqe_qunit;
 258                         /* but don't release less than qtune to avoid releasing
 259                          * space too often */
 260                         if (qbody->qb_count < lqe->lqe_qtune)
 261                                 qbody->qb_count = lqe->lqe_qtune;
 262                 }
 263                 qbody->qb_flags = QUOTA_DQACQ_FL_REL;
 264                 RETURN(true);
 265         }
 266
 267         /* 3. Any quota overrun? */
 268         if (lqe->lqe_usage > lqe->lqe_granted) {
 269                 /* we overconsumed quota space, we report usage in request so
 270                  * that master can adjust it unconditionally */
 271                 if (qbody == NULL)
 272                         RETURN(true);
 273                 qbody->qb_usage = lqe->lqe_usage;
 274                 granted         = lqe->lqe_usage;
 275                 qbody->qb_flags = QUOTA_DQACQ_FL_REPORT;
 276         }
 277
 278         /* 4. Time to pre-acquire? */
 279         if (!lqe->lqe_edquot && !lqe->lqe_nopreacq && usage > 0 &&
 280             lqe->lqe_qunit != 0 && granted < usage + lqe->lqe_qtune) {
 281                 /* To pre-acquire quota space, we report how much spare quota
 282                  * space the slave currently owns, then the master will grant us
 283                  * back how much we can pretend given the current state of
 284                  * affairs */
 285                 if (qbody == NULL)
 286                         RETURN(true);
 287                 if (granted <= usage)
 288                         qbody->qb_count = 0;
 289                 else
 290                         qbody->qb_count = granted - usage;
 291                 qbody->qb_flags |= QUOTA_DQACQ_FL_PREACQ;
 292                 RETURN(true);
 293         }
 294
 295         if (qbody != NULL)
 296                 RETURN(qbody->qb_flags != 0);
 297         else
 298                 RETURN(false);
 299 }
 300
 301 /**
 302  * Helper function returning true when quota space need to be adjusted (some
 303  * unused space should be free or pre-acquire) and false otherwise.
 304  */
 305 static inline bool qsd_adjust_needed(struct lquota_entry *lqe)
 306 {
 307         return qsd_calc_adjust(lqe, NULL);
 308 }
 309
 310 /**
 311  * Callback function called when an acquire/release request sent to the master
 312  * is completed
 313  */
 314 static void qsd_req_completion(const struct lu_env *env,
 315                                struct qsd_qtype_info *qqi,
 316                                struct quota_body *reqbody,
 317                                struct quota_body *repbody,
 318                                struct lustre_handle *lockh,
 319                                struct lquota_lvb *lvb,
 320                                void *arg, int ret)
 321 {
 322         struct lquota_entry     *lqe = (struct lquota_entry *)arg;
 323         struct qsd_thread_info  *qti;
 324         int                      rc;
 325         bool                     adjust = false, cancel = false;
 326         ENTRY;
 327
 328         LASSERT(qqi != NULL && lqe != NULL);
 329
 330         /* environment passed by ptlrpcd is mostly used by CLIO and hasn't the
 331          * DT tags set. */
 332         rc = lu_env_refill_by_tags((struct lu_env *)env, LCT_DT_THREAD, 0);
 333         if (rc) {
 334                 LQUOTA_ERROR(lqe, "failed to refill environmnent %d", rc);
 335                 lqe_write_lock(lqe);
 336                 /* can't afford to adjust quota space with no suitable lu_env */
 337                 GOTO(out_noadjust, rc);
 338         }
 339         qti = qsd_info(env);
 340
 341         lqe_write_lock(lqe);
 342         LQUOTA_DEBUG(lqe, "DQACQ returned %d, flags:0x%x", ret,
 343                      reqbody->qb_flags);
 344
 345         /* despite -EDQUOT & -EINPROGRESS errors, the master might still
 346          * grant us back quota space to adjust quota overrun */
 347         if (ret != 0 && ret != -EDQUOT && ret != -EINPROGRESS) {
 348                 if (ret != -ETIMEDOUT && ret != -ENOTCONN &&
 349                    ret != -ESHUTDOWN && ret != -EAGAIN)
 350                         /* print errors only if return code is unexpected */
 351                         LQUOTA_ERROR(lqe, "DQACQ failed with %d, flags:0x%x",
 352                                      ret, reqbody->qb_flags);
 353                 GOTO(out, ret);
 354         }
 355
 356         /* Set the lqe_lockh */
 357         if (lustre_handle_is_used(lockh) &&
 358             !lustre_handle_equal(lockh, &lqe->lqe_lockh))
 359                 lustre_handle_copy(&lqe->lqe_lockh, lockh);
 360
 361         /* If the replied qb_count is zero, it means master didn't process
 362          * the DQACQ since the limit for this ID has been removed, so we
 363          * should not update quota entry & slave index copy neither. */
 364         if (repbody != NULL && repbody->qb_count != 0) {
 365                 LQUOTA_DEBUG(lqe, "DQACQ qb_count:%llu", repbody->qb_count);
 366
 367                 if (lqe->lqe_is_reset) {
 368                         lqe->lqe_granted = 0;
 369                 } else if (req_is_rel(reqbody->qb_flags)) {
 370                         if (lqe->lqe_granted < repbody->qb_count) {
 371                                 LQUOTA_ERROR(lqe, "can't release more space "
 372                                              "than owned %llu<%llu",
 373                                              lqe->lqe_granted,
 374                                              repbody->qb_count);
 375                                 lqe->lqe_granted = 0;
 376                         } else {
 377                                 lqe->lqe_granted -= repbody->qb_count;
 378                         }
 379                         /* Cancel the per-ID lock initiatively when there
 380                          * isn't any usage & grant, which can avoid master
 381                          * sending glimpse unnecessarily to this slave on
 382                          * quota revoking */
 383                         if (!lqe->lqe_pending_write && !lqe->lqe_granted &&
 384                             !lqe->lqe_waiting_write && !lqe->lqe_usage)
 385                                 cancel = true;
 386                 } else {
 387                         lqe->lqe_granted += repbody->qb_count;
 388                 }
 389                 qti->qti_rec.lqr_slv_rec.qsr_granted = lqe->lqe_granted;
 390                 lqe_write_unlock(lqe);
 391
 392                 /* Update the slave index file in the dedicated thread. So far,
 393                  * We don't update the version of slave index copy on DQACQ.
 394                  * No locking is necessary since nobody can change
 395                  * lqe->lqe_granted while lqe->lqe_pending_req > 0 */
 396                 if (CFS_FAIL_CHECK(OBD_FAIL_QUOTA_GRANT))
 397                         qti->qti_rec.lqr_slv_rec.qsr_granted =
 398                                                         0xFFFFFFFFFFDEC80CULL;
 399                 qsd_upd_schedule(qqi, lqe, &lqe->lqe_id, &qti->qti_rec, 0,
 400                                  false);
 401                 lqe_write_lock(lqe);
 402         }
 403
 404         /* extract information from lvb */
 405         if (ret == 0 && lvb != NULL) {
 406                 if (lvb->lvb_id_qunit != 0)
 407                         qsd_set_qunit(lqe, lvb->lvb_id_qunit);
 408                 qsd_set_edquot(lqe, !!(lvb->lvb_flags & LQUOTA_FL_EDQUOT));
 409         } else if (repbody != NULL && repbody->qb_qunit != 0) {
 410                 qsd_set_qunit(lqe, repbody->qb_qunit);
 411         }
 412
 413         /* turn off pre-acquire if it failed with -EDQUOT. This is done to avoid
 414          * flooding the master with acquire request. Pre-acquire will be turned
 415          * on again as soon as qunit is modified */
 416         if (req_is_preacq(reqbody->qb_flags) && ret == -EDQUOT)
 417                 lqe->lqe_nopreacq = true;
 418 out:
 419         adjust = qsd_adjust_needed(lqe);
 420         if (reqbody && req_is_acq(reqbody->qb_flags) && ret != -EDQUOT) {
 421                 lqe->lqe_acq_rc = ret;
 422                 lqe->lqe_acq_time = ktime_get_seconds();
 423         }
 424 out_noadjust:
 425         qsd_request_exit(lqe);
 426         lqe_write_unlock(lqe);
 427
 428         /* release reference on per-ID lock */
 429         if (lustre_handle_is_used(lockh))
 430                 ldlm_lock_decref(lockh, qsd_id_einfo.ei_mode);
 431
 432         if (cancel) {
 433                 qsd_adjust_schedule(lqe, false, true);
 434         } else if (adjust) {
 435                 if (!ret || ret == -EDQUOT)
 436                         qsd_adjust_schedule(lqe, false, false);
 437                 else
 438                         qsd_adjust_schedule(lqe, true, false);
 439         }
 440         lqe_putref(lqe);
 441
 442         if (lvb)
 443                 OBD_FREE_PTR(lvb);
 444         EXIT;
 445 }
 446
 447 /**
 448  * Try to consume local quota space.
 449  *
 450  * \param lqe   - is the qid entry to be processed
 451  * \param space - is the amount of quota space needed to complete the operation
 452  *
 453  * \retval 0       - success
 454  * \retval -EDQUOT - out of quota
 455  * \retval -EAGAIN - need to acquire space from master
 456  */
 457 static int qsd_acquire_local(struct lquota_entry *lqe, __u64 space)
 458 {
 459         __u64   usage;
 460         int     rc;
 461         ENTRY;
 462
 463         if (!lqe->lqe_enforced)
 464                 /* not enforced any more, we are good */
 465                 RETURN(-ESRCH);
 466
 467         lqe_write_lock(lqe);
 468         /* use latest usage */
 469         usage = lqe->lqe_usage;
 470         /* take pending write into account */
 471         usage += lqe->lqe_pending_write;
 472
 473         if (space + usage <= lqe->lqe_granted - lqe->lqe_pending_rel) {
 474                 /* Yay! we got enough space */
 475                 lqe->lqe_pending_write += space;
 476                 lqe->lqe_waiting_write -= space;
 477                 rc = 0;
 478         /* lqe_edquot flag is used to avoid flooding dqacq requests when
 479          * the user is over quota, however, the lqe_edquot could be stale
 480          * sometimes due to the race reply of dqacq vs. id lock glimpse
 481          * (see LU-4505), so we revalidate it every 5 seconds. */
 482         } else if (lqe->lqe_edquot &&
 483                    (lqe->lqe_edquot_time > ktime_get_seconds() - 5)) {
 484                 rc = -EDQUOT;
 485         }else {
 486                 rc = -EAGAIN;
 487         }
 488         lqe_write_unlock(lqe);
 489
 490         RETURN(rc);
 491 }
 492
 493 /**
 494  * Compute how much quota space should be acquire from the master based
 495  * on how much is currently granted to this slave and pending/waiting
 496  * operations.
 497  *
 498  * \param lqe - is the lquota entry for which we would like to adjust quota
 499  *              space.
 500  * \param qbody - is the quota body of the acquire request to fill
 501  *
 502  * \retval true  - space acquisition is needed and qbody is filled
 503  * \retval false - no space acquisition required
 504  */
 505 static inline bool qsd_calc_acquire(struct lquota_entry *lqe,
 506                                     struct quota_body *qbody)
 507 {
 508         __u64   usage, granted;
 509
 510         usage   = lqe->lqe_usage;
 511         usage  += lqe->lqe_pending_write + lqe->lqe_waiting_write;
 512         granted = lqe->lqe_granted;
 513
 514         qbody->qb_flags = 0;
 515
 516         /* if we overconsumed quota space, we report usage in request so that
 517          * master can adjust it unconditionally */
 518         if (lqe->lqe_usage > lqe->lqe_granted) {
 519                 qbody->qb_usage = lqe->lqe_usage;
 520                 qbody->qb_flags = QUOTA_DQACQ_FL_REPORT;
 521                 granted = lqe->lqe_usage;
 522         }
 523
 524         /* acquire as much as needed, but not more */
 525         if (usage > granted) {
 526                 qbody->qb_count  = usage - granted;
 527                 qbody->qb_flags |= QUOTA_DQACQ_FL_ACQ;
 528         }
 529
 530         return qbody->qb_flags != 0;
 531 }
 532
 533 /**
 534  * Acquire quota space from master.
 535  * There are at most 1 in-flight dqacq/dqrel.
 536  *
 537  * \param env    - the environment passed by the caller
 538  * \param lqe    - is the qid entry to be processed
 539  *
 540  * \retval 0            - success
 541  * \retval -EDQUOT      - out of quota
 542  * \retval -EINPROGRESS - inform client to retry write/create
 543  * \retval -EBUSY       - already a quota request in flight
 544  * \retval -ve          - other appropriate errors
 545  */
 546 static int qsd_acquire_remote(const struct lu_env *env,
 547                               struct lquota_entry *lqe)
 548 {
 549         struct qsd_thread_info  *qti = qsd_info(env);
 550         struct quota_body       *qbody = &qti->qti_body;
 551         struct qsd_instance     *qsd;
 552         struct qsd_qtype_info   *qqi;
 553         int                      rc;
 554         ENTRY;
 555
 556         memset(qbody, 0, sizeof(*qbody));
 557         rc = qsd_ready(lqe, &qbody->qb_glb_lockh);
 558         if (rc)
 559                 RETURN(rc);
 560
 561         qqi = lqe2qqi(lqe);
 562         qsd = qqi->qqi_qsd;
 563
 564         lqe_write_lock(lqe);
 565
 566         /* is quota really enforced for this id? */
 567         if (!lqe->lqe_enforced) {
 568                 lqe_write_unlock(lqe);
 569                 LQUOTA_DEBUG(lqe, "quota not enforced any more");
 570                 RETURN(0);
 571         }
 572
 573         /* fill qb_count & qb_flags */
 574         if (!qsd_calc_acquire(lqe, qbody)) {
 575                 lqe_write_unlock(lqe);
 576                 LQUOTA_DEBUG(lqe, "No acquire required");
 577                 RETURN(0);
 578         }
 579
 580         /* check whether an acquire request completed recently */
 581         if (lqe->lqe_acq_rc != 0 &&
 582             lqe->lqe_acq_time > ktime_get_seconds() - 1) {
 583                 lqe_write_unlock(lqe);
 584                 LQUOTA_DEBUG(lqe, "using cached return code %d", lqe->lqe_acq_rc);
 585                 RETURN(lqe->lqe_acq_rc);
 586         }
 587
 588         /* only 1 quota request in flight for a given ID is allowed */
 589         rc = qsd_request_enter(lqe);
 590         if (rc) {
 591                 lqe_write_unlock(lqe);
 592                 RETURN(rc);
 593         }
 594
 595         lustre_handle_copy(&qti->qti_lockh, &lqe->lqe_lockh);
 596         lqe_write_unlock(lqe);
 597
 598         /* hold a refcount until completion */
 599         lqe_getref(lqe);
 600
 601         /* fill other quota body fields */
 602         qbody->qb_fid = qqi->qqi_fid;
 603         qbody->qb_id  = lqe->lqe_id;
 604
 605         /* check whether we already own a valid lock for this ID */
 606         rc = qsd_id_lock_match(&qti->qti_lockh, &qbody->qb_lockh);
 607         if (rc) {
 608                 struct lquota_lvb *lvb;
 609
 610                 OBD_ALLOC_PTR(lvb);
 611                 if (lvb == NULL) {
 612                         rc = -ENOMEM;
 613                         qsd_req_completion(env, qqi, qbody, NULL,
 614                                            &qti->qti_lockh, NULL, lqe, rc);
 615                         RETURN(rc);
 616                 }
 617                 /* no lock found, should use intent */
 618                 rc = qsd_intent_lock(env, qsd->qsd_exp, qbody, true,
 619                                      IT_QUOTA_DQACQ, qsd_req_completion,
 620                                      qqi, lvb, (void *)lqe);
 621         } else {
 622                 /* lock found, should use regular dqacq */
 623                 rc = qsd_send_dqacq(env, qsd->qsd_exp, qbody, true,
 624                                     qsd_req_completion, qqi, &qti->qti_lockh,
 625                                     lqe);
 626         }
 627
 628         /* the completion function will be called by qsd_send_dqacq or
 629          * qsd_intent_lock */
 630         RETURN(rc);
 631 }
 632
 633 /**
 634  * Acquire \a space of quota space in order to complete an operation.
 635  * Try to consume local quota space first and send acquire request to quota
 636  * master if required.
 637  *
 638  * \param env   - the environment passed by the caller
 639  * \param lqe   - is the qid entry to be processed
 640  * \param space - is the amount of quota required for the operation
 641  * \param ret   - is the return code (-EDQUOT, -EINPROGRESS, ...)
 642  *
 643  * \retval true  - stop waiting in wait_event_idle_timeout,
 644  *                 and real return value in \a ret
 645  * \retval false - continue waiting
 646  */
 647 static bool qsd_acquire(const struct lu_env *env, struct lquota_entry *lqe,
 648                         long long space, int *ret)
 649 {
 650         int rc = 0, count;
 651         int wait_pending = 0;
 652         struct qsd_qtype_info *qqi = lqe2qqi(lqe);
 653
 654         ENTRY;
 655
 656         for (count = 0; rc == 0; count++) {
 657                 LQUOTA_DEBUG(lqe, "acquiring:%lld count=%d", space, count);
 658 again:
 659                 if (lqe2qqi(lqe)->qqi_qsd->qsd_stopping) {
 660                         rc = -EINPROGRESS;
 661                         break;
 662                 }
 663
 664                 /* refresh disk usage */
 665                 rc = qsd_refresh_usage(env, lqe);
 666                 if (rc)
 667                         break;
 668
 669                 /* try to consume local quota space first */
 670                 rc = qsd_acquire_local(lqe, space);
 671                 if (rc != -EAGAIN)
 672                         /* rc == 0, Wouhou! enough local quota space
 673                          * rc < 0, something bad happened */
 674                          break;
 675                 /*
 676                  * There might be a window that commit transaction
 677                  * have updated usage but pending write doesn't change
 678                  * wait for it before acquiring remotely.
 679                  */
 680                 if (lqe->lqe_pending_write >= space && !wait_pending) {
 681                         wait_pending = 1;
 682                         dt_sync(env, qqi->qqi_qsd->qsd_dev);
 683                         goto again;
 684                 }
 685
 686                 /* if we have gotten some quota and stil wait more quota,
 687                  * it's better to give QMT some time to reclaim from clients */
 688                 if (count > 0)
 689                         schedule_timeout_interruptible(cfs_time_seconds(1));
 690
 691                 /* need to acquire more quota space from master */
 692                 rc = qsd_acquire_remote(env, lqe);
 693         }
 694
 695         if (rc == -EBUSY)
 696                 /* already a request in flight, continue waiting */
 697                 RETURN(false);
 698         *ret = rc;
 699         RETURN(true);
 700 }
 701
 702 /**
 703  * Quota enforcement handler. If local quota can satisfy this operation,
 704  * return success, otherwise, acquire more quota from master.
 705  * (for write operation, if master isn't available at this moment, return
 706  * -EINPROGRESS to inform client to retry the write)
 707  *
 708  * \param env   - the environment passed by the caller
 709  * \param qsd   - is the qsd instance associated with the device in charge
 710  *                of the operation.
 711  * \param qid   - is the qid information attached in the transaction handle
 712  * \param space - is the space required by the operation
 713  * \param flags - if the operation is write, return caller no user/group
 714  *                and sync commit flags
 715  *
 716  * \retval 0            - success
 717  * \retval -EDQUOT      - out of quota
 718  * \retval -EINPROGRESS - inform client to retry write
 719  * \retval -ve          - other appropriate errors
 720  */
 721 static int qsd_op_begin0(const struct lu_env *env, struct qsd_qtype_info *qqi,
 722                          struct lquota_id_info *qid, long long space,
 723                          enum osd_quota_local_flags *local_flags)
 724 {
 725         struct lquota_entry *lqe;
 726         enum osd_quota_local_flags qtype_flag = 0;
 727         int rc, ret = -EINPROGRESS;
 728         ENTRY;
 729
 730         if (qid->lqi_qentry != NULL) {
 731                 /* we already had to deal with this id for this transaction */
 732                 lqe = qid->lqi_qentry;
 733                 if (!lqe->lqe_enforced)
 734                         RETURN(0);
 735         } else {
 736                 /* look up lquota entry associated with qid */
 737                 lqe = lqe_locate(env, qqi->qqi_site, &qid->lqi_id);
 738                 if (IS_ERR(lqe))
 739                         RETURN(PTR_ERR(lqe));
 740                 if (!lqe->lqe_enforced) {
 741                         lqe_putref(lqe);
 742                         RETURN(0);
 743                 }
 744                 qid->lqi_qentry = lqe;
 745                 /* lqe will be released in qsd_op_end() */
 746         }
 747
 748         if (space <= 0) {
 749                 /* when space is negative or null, we don't need to consume
 750                  * quota space. That said, we still want to perform space
 751                  * adjustments in qsd_op_end, so we return here, but with
 752                  * a reference on the lqe */
 753                 if (local_flags != NULL) {
 754                         rc = qsd_refresh_usage(env, lqe);
 755                         GOTO(out_flags, rc);
 756                 }
 757                 RETURN(0);
 758         }
 759
 760         LQUOTA_DEBUG(lqe, "op_begin space:%lld", space);
 761
 762         lqe_write_lock(lqe);
 763         lqe->lqe_waiting_write += space;
 764         lqe_write_unlock(lqe);
 765
 766         /* acquire quota space for the operation, cap overall wait time to
 767          * prevent a service thread from being stuck for too long */
 768         rc = wait_event_idle_timeout(
 769                 lqe->lqe_waiters, qsd_acquire(env, lqe, space, &ret),
 770                 cfs_time_seconds(qsd_wait_timeout(qqi->qqi_qsd)));
 771
 772         if (rc > 0 && ret == 0) {
 773                 qid->lqi_space += space;
 774                 rc = 0;
 775         } else {
 776                 if (rc > 0)
 777                         rc = ret;
 778                 else if (rc == 0)
 779                         rc = -ETIMEDOUT;
 780
 781                 LQUOTA_DEBUG(lqe, "acquire quota failed:%d", rc);
 782
 783                 lqe_write_lock(lqe);
 784                 lqe->lqe_waiting_write -= space;
 785
 786                 if (local_flags && lqe->lqe_pending_write != 0)
 787                         /* Inform OSD layer that there are pending writes.
 788                          * It might want to retry after a sync if appropriate */
 789                          *local_flags |= QUOTA_FL_SYNC;
 790                 lqe_write_unlock(lqe);
 791
 792                 /* convert recoverable error into -EINPROGRESS, client will
 793                  * retry */
 794                 if (rc == -ETIMEDOUT || rc == -ENOTCONN || rc == -ENOLCK ||
 795                     rc == -EAGAIN || rc == -EINTR) {
 796                         rc = -EINPROGRESS;
 797                 } else if (rc == -ESRCH) {
 798                         rc = 0;
 799                         LQUOTA_ERROR(lqe, "ID isn't enforced on master, it "
 800                                      "probably due to a legeal race, if this "
 801                                      "message is showing up constantly, there "
 802                                      "could be some inconsistence between "
 803                                      "master & slave, and quota reintegration "
 804                                      "needs be re-triggered.");
 805                 }
 806         }
 807
 808         if (local_flags != NULL) {
 809 out_flags:
 810                 LASSERT(qid->lqi_is_blk);
 811                 if (rc != 0) {
 812                         *local_flags |= lquota_over_fl(qqi->qqi_qtype);
 813                 } else {
 814                         __u64   usage;
 815
 816                         lqe_read_lock(lqe);
 817                         usage = lqe->lqe_pending_write;
 818                         usage += lqe->lqe_waiting_write;
 819                         /* There is a chance to successfully grant more quota
 820                          * but get edquot flag through glimpse. */
 821                         if (lqe->lqe_edquot || (lqe->lqe_qunit != 0 &&
 822                            (usage % lqe->lqe_qunit >
 823                             qqi->qqi_qsd->qsd_sync_threshold)))
 824                                 usage += qqi->qqi_qsd->qsd_sync_threshold;
 825
 826                         usage += lqe->lqe_usage;
 827
 828                         qtype_flag = lquota_over_fl(qqi->qqi_qtype);
 829                         /* if we should notify client to start sync write */
 830                         if (usage >= lqe->lqe_granted - lqe->lqe_pending_rel)
 831                                 *local_flags |= qtype_flag;
 832                         else
 833                                 *local_flags &= ~qtype_flag;
 834                         lqe_read_unlock(lqe);
 835                 }
 836         }
 837         RETURN(rc);
 838 }
 839
 840 /**
 841  * helper function comparing two lquota_id_info structures
 842  */
 843 static inline bool qid_equal(struct lquota_id_info *q1,
 844                              struct lquota_id_info *q2)
 845 {
 846         if (q1->lqi_is_blk != q2->lqi_is_blk || q1->lqi_type != q2->lqi_type)
 847                 return false;
 848         return (q1->lqi_id.qid_uid == q2->lqi_id.qid_uid) ? true : false;
 849 }
 850
 851 /**
 852  * Enforce quota, it's called in the declaration of each operation.
 853  * qsd_op_end() will then be called later once all the operations have been
 854  * completed in order to release/adjust the quota space.
 855  *
 856  * \param env   - the environment passed by the caller
 857  * \param qsd   - is the qsd instance associated with the device in charge of
 858  *                the operation.
 859  * \param trans - is the quota transaction information
 860  * \param qi    - qid & space required by current operation
 861  * \param flags - if the operation is write, return caller no user/group and
 862  *                sync commit flags
 863  *
 864  * \retval 0            - success
 865  * \retval -EDQUOT      - out of quota
 866  * \retval -EINPROGRESS - inform client to retry write
 867  * \retval -ve          - other appropriate errors
 868  */
 869 int qsd_op_begin(const struct lu_env *env, struct qsd_instance *qsd,
 870                  struct lquota_trans *trans, struct lquota_id_info *qi,
 871                  enum osd_quota_local_flags *local_flags)
 872 {
 873         int     i, rc;
 874         bool    found = false;
 875         ENTRY;
 876
 877         /* fast path, ignore quota enforcement request for root owned files */
 878         if (qi->lqi_id.qid_uid == 0)
 879                 return 0;
 880
 881         if (unlikely(qsd == NULL))
 882                 RETURN(0);
 883
 884         if (qsd->qsd_dev->dd_rdonly)
 885                 RETURN(0);
 886
 887         /* We don't enforce quota until the qsd_instance is started */
 888         read_lock(&qsd->qsd_lock);
 889         if (!qsd->qsd_started) {
 890                 read_unlock(&qsd->qsd_lock);
 891                 RETURN(0);
 892         }
 893         read_unlock(&qsd->qsd_lock);
 894
 895         /* ignore block quota on MDTs, ignore inode quota on OSTs */
 896         if ((!qsd->qsd_is_md && !qi->lqi_is_blk) ||
 897             (qsd->qsd_is_md && qi->lqi_is_blk))
 898                 RETURN(0);
 899
 900         /* ignore quota enforcement request when:
 901          *    - quota isn't enforced for this quota type
 902          * or - the user/group is root
 903          * or - quota accounting isn't enabled */
 904         if (!qsd_type_enabled(qsd, qi->lqi_type) ||
 905             (qsd->qsd_type_array[qi->lqi_type])->qqi_acct_failed)
 906                 RETURN(0);
 907
 908         if (local_flags && qi->lqi_id.qid_projid && qsd->qsd_root_prj_enable)
 909                 *local_flags |= QUOTA_FL_ROOT_PRJQUOTA;
 910
 911         LASSERTF(trans->lqt_id_cnt <= QUOTA_MAX_TRANSIDS, "id_cnt=%d\n",
 912                  trans->lqt_id_cnt);
 913         /* check whether we already allocated a slot for this id */
 914         for (i = 0; i < trans->lqt_id_cnt; i++) {
 915                 if (qid_equal(qi, &trans->lqt_ids[i])) {
 916                         found = true;
 917                         break;
 918                 }
 919         }
 920
 921         if (!found) {
 922                 if (unlikely(i >= QUOTA_MAX_TRANSIDS)) {
 923                         CERROR("%s: more than %d qids enforced for a "
 924                                "transaction?\n", qsd->qsd_svname, i);
 925                         RETURN(-EINVAL);
 926                 }
 927
 928                 /* fill new slot */
 929                 trans->lqt_ids[i].lqi_id     = qi->lqi_id;
 930                 trans->lqt_ids[i].lqi_type   = qi->lqi_type;
 931                 trans->lqt_ids[i].lqi_is_blk = qi->lqi_is_blk;
 932                 trans->lqt_id_cnt++;
 933         }
 934
 935         /* manage quota enforcement for this ID */
 936         rc = qsd_op_begin0(env, qsd->qsd_type_array[qi->lqi_type],
 937                            &trans->lqt_ids[i], qi->lqi_space, local_flags);
 938         RETURN(rc);
 939 }
 940 EXPORT_SYMBOL(qsd_op_begin);
 941
 942 /**
 943  * Adjust quota space (by acquiring or releasing) hold by the quota slave.
 944  * This function is called after each quota request completion and during
 945  * reintegration in order to report usage or re-acquire quota locks.
 946  * Space adjustment is aborted if there is already a quota request in flight
 947  * for this ID.
 948  *
 949  * \param env    - the environment passed by the caller
 950  * \param lqe    - is the qid entry to be processed
 951  *
 952  * \retval 0 on success, appropriate errors on failure
 953  */
 954 int qsd_adjust(const struct lu_env *env, struct lquota_entry *lqe)
 955 {
 956         struct qsd_thread_info  *qti = qsd_info(env);
 957         struct quota_body       *qbody = &qti->qti_body;
 958         struct qsd_instance     *qsd;
 959         struct qsd_qtype_info   *qqi;
 960         int                      rc;
 961         bool                     intent = false;
 962         ENTRY;
 963
 964         memset(qbody, 0, sizeof(*qbody));
 965         rc = qsd_ready(lqe, &qbody->qb_glb_lockh);
 966         if (rc) {
 967                 /* add to adjust list again to trigger adjustment later when
 968                  * slave is ready */
 969                 LQUOTA_DEBUG(lqe, "delaying adjustment since qsd isn't ready");
 970                 qsd_adjust_schedule(lqe, true, false);
 971                 RETURN(0);
 972         }
 973
 974         qqi = lqe2qqi(lqe);
 975         qsd = qqi->qqi_qsd;
 976
 977         if (qsd->qsd_dev->dd_rdonly)
 978                 RETURN(0);
 979
 980         lqe_write_lock(lqe);
 981
 982         /* fill qb_count & qb_flags */
 983         if (!qsd_calc_adjust(lqe, qbody)) {
 984                 lqe_write_unlock(lqe);
 985                 LQUOTA_DEBUG(lqe, "no adjustment required");
 986                 RETURN(0);
 987         }
 988
 989         /* only 1 quota request in flight for a given ID is allowed */
 990         rc = qsd_request_enter(lqe);
 991         if (rc) {
 992                 /* already a request in flight, space adjustment will be run
 993                  * again on request completion */
 994                 lqe_write_unlock(lqe);
 995                 RETURN(0);
 996         }
 997
 998         if (req_is_rel(qbody->qb_flags))
 999                 lqe->lqe_pending_rel = qbody->qb_count;
1000         lustre_handle_copy(&qti->qti_lockh, &lqe->lqe_lockh);
1001         lqe_write_unlock(lqe);
1002
1003         /* hold a refcount until completion */
1004         lqe_getref(lqe);
1005
1006         /* fill other quota body fields */
1007         qbody->qb_fid = qqi->qqi_fid;
1008         qbody->qb_id  = lqe->lqe_id;
1009
1010         if (req_is_acq(qbody->qb_flags) || req_is_preacq(qbody->qb_flags)) {
1011                 /* check whether we own a valid lock for this ID */
1012                 rc = qsd_id_lock_match(&qti->qti_lockh, &qbody->qb_lockh);
1013                 if (rc) {
1014                         memset(&qti->qti_lockh, 0, sizeof(qti->qti_lockh));
1015                         if (req_is_preacq(qbody->qb_flags)) {
1016                                 if (req_has_rep(qbody->qb_flags))
1017                                         /* still want to report usage */
1018                                         qbody->qb_flags = QUOTA_DQACQ_FL_REPORT;
1019                                 else
1020                                         /* no pre-acquire if no per-ID lock */
1021                                         GOTO(out, rc = -ENOLCK);
1022                         } else {
1023                                 /* no lock found, should use intent */
1024                                 intent = true;
1025                         }
1026                 } else if (req_is_acq(qbody->qb_flags) &&
1027                            qbody->qb_count == 0) {
1028                         /* found cached lock, no need to acquire */
1029                         GOTO(out, rc = 0);
1030                 }
1031         } else {
1032                 /* release and report don't need a per-ID lock */
1033                 memset(&qti->qti_lockh, 0, sizeof(qti->qti_lockh));
1034         }
1035
1036         if (!intent) {
1037                 rc = qsd_send_dqacq(env, qsd->qsd_exp, qbody, false,
1038                                     qsd_req_completion, qqi, &qti->qti_lockh,
1039                                     lqe);
1040         } else {
1041                 struct lquota_lvb *lvb;
1042
1043                 OBD_ALLOC_PTR(lvb);
1044                 if (lvb == NULL)
1045                         GOTO(out, rc = -ENOMEM);
1046
1047                 rc = qsd_intent_lock(env, qsd->qsd_exp, qbody, false,
1048                                      IT_QUOTA_DQACQ, qsd_req_completion,
1049                                      qqi, lvb, (void *)lqe);
1050         }
1051         /* the completion function will be called by qsd_send_dqacq or
1052          * qsd_intent_lock */
1053         RETURN(rc);
1054 out:
1055         qsd_req_completion(env, qqi, qbody, NULL, &qti->qti_lockh, NULL, lqe,
1056                            rc);
1057         return rc;
1058 }
1059
1060 /**
1061  * Post quota operation, pre-acquire/release quota from master.
1062  *
1063  * \param  env  - the environment passed by the caller
1064  * \param  qsd  - is the qsd instance attached to the OSD device which
1065  *                is handling the operation.
1066  * \param  qqi  - is the qsd_qtype_info structure associated with the quota ID
1067  *                subject to the operation
1068  * \param  qid  - stores information related to his ID for the operation
1069  *                which has just completed
1070  *
1071  * \retval 0    - success
1072  * \retval -ve  - failure
1073  */
1074 static void qsd_op_end0(const struct lu_env *env, struct qsd_qtype_info *qqi,
1075                         struct lquota_id_info *qid)
1076 {
1077         struct lquota_entry     *lqe;
1078         bool                     adjust;
1079         ENTRY;
1080
1081         lqe = qid->lqi_qentry;
1082         if (lqe == NULL)
1083                 RETURN_EXIT;
1084         qid->lqi_qentry = NULL;
1085
1086         /* refresh cached usage if a suitable environment is passed */
1087         if (env != NULL)
1088                 qsd_refresh_usage(env, lqe);
1089
1090         lqe_write_lock(lqe);
1091         if (qid->lqi_space > 0) {
1092                 if (lqe->lqe_pending_write < qid->lqi_space) {
1093                         LQUOTA_ERROR(lqe,
1094                                      "More pending write quota to reduce (pending %llu, space %lld)\n",
1095                                      lqe->lqe_pending_write, qid->lqi_space);
1096                         lqe->lqe_pending_write = 0;
1097                 } else {
1098                         lqe->lqe_pending_write -= qid->lqi_space;
1099                 }
1100         }
1101         if (env != NULL)
1102                 adjust = qsd_adjust_needed(lqe);
1103         else
1104                 adjust = true;
1105         lqe_write_unlock(lqe);
1106
1107         if (adjust) {
1108                 /* pre-acquire/release quota space is needed */
1109                 if (env != NULL)
1110                         qsd_adjust(env, lqe);
1111                 else
1112                         /* no suitable environment, handle adjustment in
1113                          * separate thread context */
1114                         qsd_adjust_schedule(lqe, false, false);
1115         }
1116         lqe_putref(lqe);
1117         EXIT;
1118 }
1119
1120 /**
1121  * Post quota operation. It's called after each operation transaction stopped.
1122  *
1123  * \param  env   - the environment passed by the caller
1124  * \param  qsd   - is the qsd instance associated with device which is handling
1125  *                 the operation.
1126  * \param  qids  - all qids information attached in the transaction handle
1127  * \param  count - is the number of qid entries in the qids array.
1128  *
1129  * \retval 0     - success
1130  * \retval -ve   - failure
1131  */
1132 void qsd_op_end(const struct lu_env *env, struct qsd_instance *qsd,
1133                 struct lquota_trans *trans)
1134 {
1135         int i;
1136         ENTRY;
1137
1138         if (unlikely(qsd == NULL))
1139                 RETURN_EXIT;
1140
1141         if (qsd->qsd_dev->dd_rdonly)
1142                 RETURN_EXIT;
1143
1144         /* We don't enforce quota until the qsd_instance is started */
1145         read_lock(&qsd->qsd_lock);
1146         if (!qsd->qsd_started) {
1147                 read_unlock(&qsd->qsd_lock);
1148                 RETURN_EXIT;
1149         }
1150         read_unlock(&qsd->qsd_lock);
1151
1152         LASSERT(trans != NULL);
1153
1154         for (i = 0; i < trans->lqt_id_cnt; i++) {
1155                 struct qsd_qtype_info *qqi;
1156
1157                 if (trans->lqt_ids[i].lqi_qentry == NULL)
1158                         continue;
1159
1160                 qqi = qsd->qsd_type_array[trans->lqt_ids[i].lqi_type];
1161                 qsd_op_end0(env, qqi, &trans->lqt_ids[i]);
1162         }
1163
1164         /* reset id_count to 0 so that a second accidental call to qsd_op_end()
1165          * does not result in failure */
1166         trans->lqt_id_cnt = 0;
1167         EXIT;
1168 }
1169 EXPORT_SYMBOL(qsd_op_end);
1170
1171 /* Simple wrapper on top of qsd API which implement quota transfer for osd
1172  * setattr needs. As a reminder, only the root user can change ownership of
1173  * a file, that's why EDQUOT & EINPROGRESS errors are discarded
1174  */
1175 int qsd_transfer(const struct lu_env *env, struct qsd_instance *qsd,
1176                  struct lquota_trans *trans, unsigned int qtype,
1177                  u64 orig_id, u64 new_id, u64 bspace,
1178                  struct lquota_id_info *qi)
1179 {
1180         int rc;
1181
1182         if (unlikely(!qsd))
1183                 return 0;
1184
1185         LASSERT(qtype < LL_MAXQUOTAS);
1186         if (qtype == PRJQUOTA)
1187                 if (!projid_valid(make_kprojid(&init_user_ns, new_id)))
1188                         return -EINVAL;
1189
1190         qi->lqi_type = qtype;
1191
1192         /* inode accounting */
1193         qi->lqi_is_blk = false;
1194
1195         /* one more inode for the new owner ... */
1196         qi->lqi_id.qid_uid = new_id;
1197         qi->lqi_space = 1;
1198         rc = qsd_op_begin(env, qsd, trans, qi, NULL);
1199         if (rc == -EDQUOT || rc == -EINPROGRESS)
1200                 rc = 0;
1201         if (rc)
1202                 return rc;
1203
1204         /* and one less inode for the current id */
1205         qi->lqi_id.qid_uid = orig_id;
1206         qi->lqi_space = -1;
1207         /* can't get EDQUOT when reducing usage */
1208         rc = qsd_op_begin(env, qsd, trans, qi, NULL);
1209         if (rc == -EINPROGRESS)
1210                 rc = 0;
1211         if (rc)
1212                 return rc;
1213
1214         /* block accounting */
1215         qi->lqi_is_blk = true;
1216
1217         /* more blocks for the new owner ... */
1218         qi->lqi_id.qid_uid = new_id;
1219         qi->lqi_space = bspace;
1220         rc = qsd_op_begin(env, qsd, trans, qi, NULL);
1221         if (rc == -EDQUOT || rc == -EINPROGRESS)
1222                 rc = 0;
1223         if (rc)
1224                 return rc;
1225
1226         /* and finally less blocks for the current owner */
1227         qi->lqi_id.qid_uid = orig_id;
1228         qi->lqi_space = -bspace;
1229         rc = qsd_op_begin(env, qsd, trans, qi, NULL);
1230         /* can't get EDQUOT when reducing usage */
1231         if (rc == -EINPROGRESS)
1232                 rc = 0;
1233         return rc;
1234 }
1235 EXPORT_SYMBOL(qsd_transfer);
1236
1237 /**
1238  * Trigger pre-acquire/release if necessary.
1239  * It's only used by ldiskfs osd so far. When unlink a file in ldiskfs, the
1240  * quota accounting isn't updated when the transaction stopped. Instead, it'll
1241  * be updated on the final iput, so qsd_op_adjust() will be called then (in
1242  * osd_object_delete()) to trigger quota release if necessary.
1243  *
1244  * \param env - the environment passed by the caller
1245  * \param qsd - is the qsd instance associated with the device in charge
1246  *              of the operation.
1247  * \param qid - is the lquota ID of the user/group for which to trigger
1248  *              quota space adjustment
1249  * \param qtype - is the quota type (USRQUOTA or GRPQUOTA)
1250  */
1251 void qsd_op_adjust(const struct lu_env *env, struct qsd_instance *qsd,
1252                    union lquota_id *qid, int qtype)
1253 {
1254         struct lquota_entry    *lqe;
1255         struct qsd_qtype_info  *qqi;
1256         bool                    adjust;
1257         ENTRY;
1258
1259         if (unlikely(qsd == NULL))
1260                 RETURN_EXIT;
1261
1262         /* We don't enforce quota until the qsd_instance is started */
1263         read_lock(&qsd->qsd_lock);
1264         if (!qsd->qsd_started) {
1265                 read_unlock(&qsd->qsd_lock);
1266                 RETURN_EXIT;
1267         }
1268         read_unlock(&qsd->qsd_lock);
1269
1270         qqi = qsd->qsd_type_array[qtype];
1271         LASSERT(qqi);
1272
1273         if (!qsd_type_enabled(qsd, qtype) || qqi->qqi_acct_obj == NULL ||
1274             qid->qid_uid == 0 || qsd->qsd_dev->dd_rdonly)
1275                 RETURN_EXIT;
1276
1277         read_lock(&qsd->qsd_lock);
1278         if (!qsd->qsd_started) {
1279                 read_unlock(&qsd->qsd_lock);
1280                 RETURN_EXIT;
1281         }
1282         read_unlock(&qsd->qsd_lock);
1283
1284         lqe = lqe_locate(env, qqi->qqi_site, qid);
1285         if (IS_ERR(lqe)) {
1286                 CERROR("%s: fail to locate lqe for id:%llu, type:%d\n",
1287                        qsd->qsd_svname, qid->qid_uid, qtype);
1288                 RETURN_EXIT;
1289         }
1290
1291         qsd_refresh_usage(env, lqe);
1292
1293         lqe_read_lock(lqe);
1294         adjust = qsd_adjust_needed(lqe);
1295         lqe_read_unlock(lqe);
1296
1297         if (adjust)
1298                 qsd_adjust(env, lqe);
1299
1300         lqe_putref(lqe);
1301         EXIT;
1302 }
1303 EXPORT_SYMBOL(qsd_op_adjust);
1304
1305 /**
1306  * Reserve or free quota.
1307  *
1308  * Currently, It's used to reserve quota space before changing the file's group
1309  * for normal user and free the reserved quota after the group change.
1310  *
1311  * \param env     - the environment passed by the caller
1312  * \param qsd     - is the qsd instance associated with the device in charge of
1313  *                  the operation.
1314  * \param qi      - qid & space required by current operation
1315  *
1316  * \retval 0            - success
1317  * \retval -EDQUOT      - out of quota
1318  * \retval -EINPROGRESS - inform client to retry write
1319  * \retval -ve          - other appropriate errors
1320  */
1321 int qsd_reserve_or_free_quota(const struct lu_env *env,
1322                               struct qsd_instance *qsd,
1323                               struct lquota_id_info *qi)
1324 {
1325         struct qsd_qtype_info  *qqi;
1326         bool is_free = qi->lqi_space < 0;
1327         int rc = 0;
1328
1329         ENTRY;
1330
1331         if (unlikely(qsd == NULL))
1332                 RETURN(0);
1333
1334         if (qsd->qsd_dev->dd_rdonly)
1335                 RETURN(0);
1336
1337         if (is_free)
1338                 qi->lqi_space *= -1;
1339
1340         /* We don't enforce quota until the qsd_instance is started */
1341         read_lock(&qsd->qsd_lock);
1342         if (!qsd->qsd_started) {
1343                 read_unlock(&qsd->qsd_lock);
1344                 RETURN(0);
1345         }
1346         read_unlock(&qsd->qsd_lock);
1347
1348         qqi = qsd->qsd_type_array[qi->lqi_type];
1349         LASSERT(qqi);
1350
1351         CDEBUG(D_QUOTA, "type %s, acct %s, free %d, count %llu\n",
1352                qsd_type_enabled(qsd, qi->lqi_type) ? "enabled" : "disabled",
1353                (qsd->qsd_type_array[qi->lqi_type])->qqi_acct_failed ? "failed" :
1354                "succeed", is_free, qi->lqi_space);
1355
1356         /* ignore quota enforcement request when:
1357          *    - quota isn't enforced for this quota type
1358          * or - the user/group is root
1359          * or - quota accounting isn't enabled
1360          */
1361         if (!is_free &&
1362             (!qsd_type_enabled(qsd, qi->lqi_type) || qi->lqi_id.qid_uid == 0 ||
1363               (qsd->qsd_type_array[qi->lqi_type])->qqi_acct_failed))
1364                 RETURN(0);
1365
1366         if (is_free) {
1367                 qsd_op_end0(env, qsd->qsd_type_array[qi->lqi_type], qi);
1368         } else {
1369                 long long qspace = qi->lqi_space;
1370
1371                 /* the acquired quota will add to lqi_space in qsd_op_begin0 */
1372                 qi->lqi_space = 0;
1373                 rc = qsd_op_begin0(env, qsd->qsd_type_array[qi->lqi_type], qi,
1374                                    qspace, NULL);
1375                 if (rc && qi->lqi_qentry) {
1376                         lqe_putref(qi->lqi_qentry);
1377                         qi->lqi_qentry = NULL;
1378                 }
1379         }
1380
1381         CDEBUG(D_QUOTA, "%s quota: type %i, uid %llu, gid %llu, space %llu\n",
1382                is_free ? "Free" : "Reserve", qi->lqi_type, qi->lqi_id.qid_uid,
1383                qi->lqi_id.qid_gid, qi->lqi_space);
1384
1385         RETURN(rc);
1386 }
1387 EXPORT_SYMBOL(qsd_reserve_or_free_quota);