lustre/quota/quota_context.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/quota/quota_context.c
  37  *
  38  * Lustre Quota Context
  39  *
  40  * Author: Niu YaWei <niu@clusterfs.com>
  41  */
  42
  43 #ifndef EXPORT_SYMTAB
  44 # define EXPORT_SYMTAB
  45 #endif
  46
  47 #define DEBUG_SUBSYSTEM S_LQUOTA
  48
  49 #include <linux/version.h>
  50 #include <linux/fs.h>
  51 #include <asm/unistd.h>
  52 #include <linux/slab.h>
  53 #include <linux/quotaops.h>
  54 #include <linux/module.h>
  55 #include <linux/init.h>
  56
  57 #include <obd_class.h>
  58 #include <lustre_quota.h>
  59 #include <lustre_fsfilt.h>
  60 #include <class_hash.h>
  61 #include <lprocfs_status.h>
  62 #include "quota_internal.h"
  63
  64 #ifdef HAVE_QUOTA_SUPPORT
  65
  66 static lustre_hash_ops_t lqs_hash_ops;
  67
  68 unsigned long default_bunit_sz = 128 * 1024 * 1024; /* 128M bytes */
  69 unsigned long default_btune_ratio = 50;             /* 50 percentage */
  70 unsigned long default_iunit_sz = 5120;              /* 5120 inodes */
  71 unsigned long default_itune_ratio = 50;             /* 50 percentage */
  72
  73 cfs_mem_cache_t *qunit_cachep = NULL;
  74 struct list_head qunit_hash[NR_DQHASH];
  75 spinlock_t qunit_hash_lock = SPIN_LOCK_UNLOCKED;
  76
  77 /* please sync qunit_state with qunit_state_names */
  78 enum qunit_state {
  79         /**
  80          * a qunit is created
  81          */
  82         QUNIT_CREATED      = 0,
  83         /**
  84          * a qunit is added into qunit hash, that means
  85          * a quota req will be sent or is flying
  86          */
  87         QUNIT_IN_HASH      = 1,
  88         /**
  89          * a qunit is removed from qunit hash, that
  90          * means a quota req is handled and comes back
  91          */
  92         QUNIT_RM_FROM_HASH = 2,
  93         /**
  94          * qunit can wake up all threads waiting for it
  95          */
  96         QUNIT_FINISHED     = 3,
  97 };
  98
  99 static const char *qunit_state_names[] = {
 100         [QUNIT_CREATED]      = "CREATED",
 101         [QUNIT_IN_HASH]      = "IN_HASH",
 102         [QUNIT_RM_FROM_HASH] = "RM_FROM_HASH",
 103         [QUNIT_FINISHED]     = "FINISHED",
 104 };
 105
 106 struct lustre_qunit {
 107         struct list_head lq_hash;          /** Hash list in memory */
 108         atomic_t lq_refcnt;                /** Use count */
 109         struct lustre_quota_ctxt *lq_ctxt; /** Quota context this applies to */
 110         struct qunit_data lq_data;         /** See qunit_data */
 111         unsigned int lq_opc;               /** QUOTA_DQACQ, QUOTA_DQREL */
 112         cfs_waitq_t lq_waitq;              /** Threads waiting for this qunit */
 113         spinlock_t lq_lock;                /** Protect the whole structure */
 114         enum qunit_state lq_state;         /** Present the status of qunit */
 115         int lq_rc;                         /** The rc of lq_data */
 116 };
 117
 118 #define QUNIT_SET_STATE(qunit, state)                                   \
 119 do {                                                                    \
 120         spin_lock(&qunit->lq_lock);                                     \
 121         QDATA_DEBUG((&qunit->lq_data), "qunit(%p) lq_state(%s->%s), "   \
 122                     "lq_rc(%d)\n",                                      \
 123                     qunit, qunit_state_names[qunit->lq_state],          \
 124                     qunit_state_names[state], qunit->lq_rc);            \
 125         qunit->lq_state = state;                                        \
 126         spin_unlock(&qunit->lq_lock);                                   \
 127 } while(0)
 128
 129 #define QUNIT_SET_STATE_AND_RC(qunit, state, rc)                        \
 130 do {                                                                    \
 131         spin_lock(&qunit->lq_lock);                                     \
 132         qunit->lq_rc = rc;                                              \
 133         QDATA_DEBUG((&qunit->lq_data), "qunit(%p) lq_state(%s->%s), "   \
 134                     "lq_rc(%d)\n",                                      \
 135                     qunit, qunit_state_names[qunit->lq_state],          \
 136                     qunit_state_names[state], qunit->lq_rc);            \
 137         qunit->lq_state = state;                                        \
 138         spin_unlock(&qunit->lq_lock);                                   \
 139 } while(0)
 140
 141
 142 int should_translate_quota (struct obd_import *imp)
 143 {
 144         ENTRY;
 145
 146         LASSERT(imp);
 147         if (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_QUOTA64)
 148                 RETURN(0);
 149         else
 150                 RETURN(1);
 151 }
 152
 153 void qunit_cache_cleanup(void)
 154 {
 155         int i;
 156         ENTRY;
 157
 158         spin_lock(&qunit_hash_lock);
 159         for (i = 0; i < NR_DQHASH; i++)
 160                 LASSERT(list_empty(qunit_hash + i));
 161         spin_unlock(&qunit_hash_lock);
 162
 163         if (qunit_cachep) {
 164                 int rc;
 165                 rc = cfs_mem_cache_destroy(qunit_cachep);
 166                 LASSERTF(rc == 0, "couldn't destroy qunit_cache slab\n");
 167                 qunit_cachep = NULL;
 168         }
 169         EXIT;
 170 }
 171
 172 int qunit_cache_init(void)
 173 {
 174         int i;
 175         ENTRY;
 176
 177         LASSERT(qunit_cachep == NULL);
 178         qunit_cachep = cfs_mem_cache_create("ll_qunit_cache",
 179                                             sizeof(struct lustre_qunit),
 180                                             0, 0);
 181         if (!qunit_cachep)
 182                 RETURN(-ENOMEM);
 183
 184         spin_lock(&qunit_hash_lock);
 185         for (i = 0; i < NR_DQHASH; i++)
 186                 CFS_INIT_LIST_HEAD(qunit_hash + i);
 187         spin_unlock(&qunit_hash_lock);
 188         RETURN(0);
 189 }
 190
 191 static inline int
 192 qunit_hashfn(struct lustre_quota_ctxt *qctxt, struct qunit_data *qdata)
 193              __attribute__((__const__));
 194
 195 static inline int
 196 qunit_hashfn(struct lustre_quota_ctxt *qctxt, struct qunit_data *qdata)
 197 {
 198         unsigned int id = qdata->qd_id;
 199         unsigned int type = QDATA_IS_GRP(qdata);
 200
 201         unsigned long tmp = ((unsigned long)qctxt >> L1_CACHE_SHIFT) ^ id;
 202         tmp = (tmp * (MAXQUOTAS - type)) % NR_DQHASH;
 203         return tmp;
 204 }
 205
 206 /* caller must hold qunit_hash_lock */
 207 static inline struct lustre_qunit *find_qunit(unsigned int hashent,
 208                                               struct lustre_quota_ctxt *qctxt,
 209                                               struct qunit_data *qdata)
 210 {
 211         struct lustre_qunit *qunit = NULL;
 212         struct qunit_data *tmp;
 213
 214         LASSERT_SPIN_LOCKED(&qunit_hash_lock);
 215         list_for_each_entry(qunit, qunit_hash + hashent, lq_hash) {
 216                 tmp = &qunit->lq_data;
 217                 if (qunit->lq_ctxt == qctxt &&
 218                     qdata->qd_id == tmp->qd_id &&
 219                     (qdata->qd_flags & LQUOTA_QUNIT_FLAGS) ==
 220                     (tmp->qd_flags & LQUOTA_QUNIT_FLAGS))
 221                         return qunit;
 222         }
 223         return NULL;
 224 }
 225
 226 /* check_cur_qunit - check the current usage of qunit.
 227  * @qctxt: quota context
 228  * @qdata: the type of quota unit to be checked
 229  *
 230  * return: 1 - need acquire qunit;
 231  *         2 - need release qunit;
 232  *         0 - need do nothing.
 233  *       < 0 - error.
 234  */
 235 static int
 236 check_cur_qunit(struct obd_device *obd,
 237                 struct lustre_quota_ctxt *qctxt, struct qunit_data *qdata)
 238 {
 239         struct super_block *sb = qctxt->lqc_sb;
 240         unsigned long qunit_sz, tune_sz;
 241         __u64 usage, limit, limit_org, pending_write = 0;
 242         long long record = 0;
 243         struct obd_quotactl *qctl;
 244         struct lustre_qunit_size *lqs = NULL;
 245         int ret = 0;
 246         ENTRY;
 247
 248         if (!sb_any_quota_enabled(sb))
 249                 RETURN(0);
 250
 251         spin_lock(&qctxt->lqc_lock);
 252         if (!qctxt->lqc_valid){
 253                 spin_unlock(&qctxt->lqc_lock);
 254                 RETURN(0);
 255         }
 256         spin_unlock(&qctxt->lqc_lock);
 257
 258         OBD_ALLOC_PTR(qctl);
 259         if (qctl == NULL)
 260                 RETURN(-ENOMEM);
 261
 262         /* get fs quota usage & limit */
 263         qctl->qc_cmd = Q_GETQUOTA;
 264         qctl->qc_id = qdata->qd_id;
 265         qctl->qc_type = QDATA_IS_GRP(qdata);
 266         ret = fsfilt_quotactl(obd, sb, qctl);
 267         if (ret) {
 268                 if (ret == -ESRCH)      /* no limit */
 269                         ret = 0;
 270                 else
 271                         CERROR("can't get fs quota usage! (rc:%d)\n", ret);
 272                 GOTO(out, ret);
 273         }
 274
 275         if (QDATA_IS_BLK(qdata)) {
 276                 usage = qctl->qc_dqblk.dqb_curspace;
 277                 limit = qctl->qc_dqblk.dqb_bhardlimit << QUOTABLOCK_BITS;
 278         } else {
 279                 usage = qctl->qc_dqblk.dqb_curinodes;
 280                 limit = qctl->qc_dqblk.dqb_ihardlimit;
 281         }
 282
 283         /* ignore the no quota limit case; and it can avoid creating
 284          * unnecessary lqs for uid/gid */
 285         if (!limit)
 286                 GOTO(out, ret = 0);
 287
 288  search_lqs:
 289         quota_search_lqs(qdata, NULL, qctxt, &lqs);
 290         if (!lqs) {
 291                 CDEBUG(D_QUOTA, "Can't find the lustre qunit size!\n");
 292                 ret = quota_create_lqs(qdata, NULL, qctxt, &lqs);
 293                 if (ret == -EALREADY) {
 294                         ret = 0;
 295                         goto search_lqs;
 296                 }
 297                 if (ret < 0)
 298                         GOTO (out, ret);
 299         }
 300         spin_lock(&lqs->lqs_lock);
 301
 302         if (QDATA_IS_BLK(qdata)) {
 303                 qunit_sz = lqs->lqs_bunit_sz;
 304                 tune_sz  = lqs->lqs_btune_sz;
 305                 pending_write = lqs->lqs_bwrite_pending * CFS_PAGE_SIZE;
 306                 record   = lqs->lqs_blk_rec;
 307                 LASSERT(!(qunit_sz % QUOTABLOCK_SIZE));
 308         } else {
 309                 /* we didn't need change inode qunit size now */
 310                 qunit_sz = lqs->lqs_iunit_sz;
 311                 tune_sz  = lqs->lqs_itune_sz;
 312                 pending_write = lqs->lqs_iwrite_pending;
 313                 record   = lqs->lqs_ino_rec;
 314         }
 315
 316         /* we don't count the MIN_QLIMIT */
 317         if ((limit == MIN_QLIMIT && !QDATA_IS_BLK(qdata)) ||
 318             (toqb(limit) == MIN_QLIMIT && QDATA_IS_BLK(qdata)))
 319                 limit = 0;
 320
 321         usage += pending_write;
 322         limit_org = limit;
 323         /* when a releasing quota req is sent, before it returned
 324            limit is assigned a small value. limit will overflow */
 325         if (limit + record < 0)
 326                 usage -= record;
 327         else
 328                 limit += record;
 329
 330         LASSERT(qdata->qd_count == 0);
 331         if (limit <= usage + tune_sz) {
 332                 while (qdata->qd_count + limit <=
 333                        usage + tune_sz)
 334                         qdata->qd_count += qunit_sz;
 335                 ret = 1;
 336         } else if (limit > usage + qunit_sz + tune_sz &&
 337                    limit_org > qdata->qd_count + qunit_sz) {
 338                 while (limit - qdata->qd_count > usage + qunit_sz + tune_sz &&
 339                        limit_org > qdata->qd_count + qunit_sz)
 340                         qdata->qd_count += qunit_sz;
 341                 ret = 2;
 342                 /* if there are other pending writes for this uid/gid, releasing
 343                  * quota is put off until the last pending write b=16645 */
 344                 if (ret == 2 && pending_write) {
 345                         CDEBUG(D_QUOTA, "delay quota release\n");
 346                         ret = 0;
 347                 }
 348         }
 349         CDEBUG(D_QUOTA, "type: %c, limit: "LPU64", usage: "LPU64
 350                ", pending_write: "LPU64", record: "LPD64
 351                ", qunit_sz: %lu, tune_sz: %lu, ret: %d.\n",
 352                QDATA_IS_BLK(qdata) ? 'b' : 'i', limit, usage, pending_write,
 353                record, qunit_sz, tune_sz, ret);
 354         LASSERT(ret == 0 || qdata->qd_count);
 355
 356         spin_unlock(&lqs->lqs_lock);
 357         lqs_putref(lqs);
 358         EXIT;
 359  out:
 360         OBD_FREE_PTR(qctl);
 361         return ret;
 362 }
 363
 364 /**
 365  * Compute the remaining quota for certain gid or uid b=11693
 366  */
 367 int compute_remquota(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 368                      struct qunit_data *qdata, int isblk)
 369 {
 370         struct super_block *sb = qctxt->lqc_sb;
 371         __u64 usage, limit;
 372         struct obd_quotactl *qctl;
 373         int ret = QUOTA_RET_OK;
 374         ENTRY;
 375
 376         if (!sb_any_quota_enabled(sb))
 377                 RETURN(QUOTA_RET_NOQUOTA);
 378
 379         /* ignore root user */
 380         if (qdata->qd_id == 0 && QDATA_IS_GRP(qdata) == USRQUOTA)
 381                 RETURN(QUOTA_RET_NOLIMIT);
 382
 383         OBD_ALLOC_PTR(qctl);
 384         if (qctl == NULL)
 385                 RETURN(-ENOMEM);
 386
 387         /* get fs quota usage & limit */
 388         qctl->qc_cmd = Q_GETQUOTA;
 389         qctl->qc_id = qdata->qd_id;
 390         qctl->qc_type = QDATA_IS_GRP(qdata);
 391         ret = fsfilt_quotactl(obd, sb, qctl);
 392         if (ret) {
 393                 if (ret == -ESRCH)      /* no limit */
 394                         ret = QUOTA_RET_NOLIMIT;
 395                 else
 396                         CDEBUG(D_QUOTA, "can't get fs quota usage! (rc:%d)",
 397                                ret);
 398                 GOTO(out, ret);
 399         }
 400
 401         usage = isblk ? qctl->qc_dqblk.dqb_curspace :
 402                 qctl->qc_dqblk.dqb_curinodes;
 403         limit = isblk ? qctl->qc_dqblk.dqb_bhardlimit << QUOTABLOCK_BITS :
 404                 qctl->qc_dqblk.dqb_ihardlimit;
 405         if (!limit){            /* no limit */
 406                 ret = QUOTA_RET_NOLIMIT;
 407                 GOTO(out, ret);
 408         }
 409
 410         if (limit >= usage)
 411                 qdata->qd_count = limit - usage;
 412         else
 413                 qdata->qd_count = 0;
 414         EXIT;
 415 out:
 416         OBD_FREE_PTR(qctl);
 417         return ret;
 418 }
 419
 420 /* caller must hold qunit_hash_lock */
 421 static struct lustre_qunit *dqacq_in_flight(struct lustre_quota_ctxt *qctxt,
 422                                             struct qunit_data *qdata)
 423 {
 424         unsigned int hashent = qunit_hashfn(qctxt, qdata);
 425         struct lustre_qunit *qunit;
 426         ENTRY;
 427
 428         LASSERT_SPIN_LOCKED(&qunit_hash_lock);
 429         qunit = find_qunit(hashent, qctxt, qdata);
 430         RETURN(qunit);
 431 }
 432
 433 static struct lustre_qunit *alloc_qunit(struct lustre_quota_ctxt *qctxt,
 434                                         struct qunit_data *qdata, int opc)
 435 {
 436         struct lustre_qunit *qunit = NULL;
 437         ENTRY;
 438
 439         OBD_SLAB_ALLOC(qunit, qunit_cachep, CFS_ALLOC_IO, sizeof(*qunit));
 440         if (qunit == NULL)
 441                 RETURN(NULL);
 442
 443         CFS_INIT_LIST_HEAD(&qunit->lq_hash);
 444         init_waitqueue_head(&qunit->lq_waitq);
 445         atomic_set(&qunit->lq_refcnt, 1);
 446         qunit->lq_ctxt = qctxt;
 447         memcpy(&qunit->lq_data, qdata, sizeof(*qdata));
 448         qunit->lq_opc = opc;
 449         qunit->lq_lock = SPIN_LOCK_UNLOCKED;
 450         QUNIT_SET_STATE_AND_RC(qunit, QUNIT_CREATED, 0);
 451         RETURN(qunit);
 452 }
 453
 454 static inline void free_qunit(struct lustre_qunit *qunit)
 455 {
 456         OBD_SLAB_FREE(qunit, qunit_cachep, sizeof(*qunit));
 457 }
 458
 459 static inline void qunit_get(struct lustre_qunit *qunit)
 460 {
 461         atomic_inc(&qunit->lq_refcnt);
 462 }
 463
 464 static void qunit_put(struct lustre_qunit *qunit)
 465 {
 466         LASSERT(atomic_read(&qunit->lq_refcnt));
 467         if (atomic_dec_and_test(&qunit->lq_refcnt))
 468                 free_qunit(qunit);
 469 }
 470
 471 static void
 472 insert_qunit_nolock(struct lustre_quota_ctxt *qctxt, struct lustre_qunit *qunit)
 473 {
 474         struct list_head *head;
 475
 476         LASSERT(list_empty(&qunit->lq_hash));
 477         qunit_get(qunit);
 478         head = qunit_hash + qunit_hashfn(qctxt, &qunit->lq_data);
 479         list_add(&qunit->lq_hash, head);
 480         QUNIT_SET_STATE(qunit, QUNIT_IN_HASH);
 481 }
 482
 483 static void compute_lqs_after_removing_qunit(struct lustre_qunit *qunit)
 484 {
 485         struct lustre_qunit_size *lqs = NULL;
 486
 487         quota_search_lqs(&qunit->lq_data, NULL, qunit->lq_ctxt, &lqs);
 488         if (lqs) {
 489                 spin_lock(&lqs->lqs_lock);
 490                 if (qunit->lq_opc == QUOTA_DQACQ)
 491                         quota_compute_lqs(&qunit->lq_data, lqs, 0, 1);
 492                 if (qunit->lq_opc == QUOTA_DQREL)
 493                         quota_compute_lqs(&qunit->lq_data, lqs, 0, 0);
 494                 spin_unlock(&lqs->lqs_lock);
 495                 /* this is for quota_search_lqs */
 496                 lqs_putref(lqs);
 497                 /* this is for schedule_dqacq */
 498                 lqs_putref(lqs);
 499         }
 500
 501 }
 502
 503 static void remove_qunit_nolock(struct lustre_qunit *qunit)
 504 {
 505         LASSERT(!list_empty(&qunit->lq_hash));
 506         LASSERT_SPIN_LOCKED(&qunit_hash_lock);
 507
 508         list_del_init(&qunit->lq_hash);
 509         QUNIT_SET_STATE(qunit, QUNIT_RM_FROM_HASH);
 510         qunit_put(qunit);
 511 }
 512
 513 #define INC_QLIMIT(limit, count) (limit == MIN_QLIMIT) ? \
 514                                  (limit = count) : (limit += count)
 515
 516
 517 static inline int is_master(struct lustre_quota_ctxt *qctxt)
 518 {
 519         return qctxt->lqc_handler ? 1 : 0;
 520 }
 521
 522 static int
 523 schedule_dqacq(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 524                struct qunit_data *qdata, int opc, int wait,
 525                struct obd_trans_info *oti);
 526
 527 static int
 528 dqacq_completion(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 529                  struct qunit_data *qdata, int rc, int opc)
 530 {
 531         struct lustre_qunit *qunit = NULL;
 532         struct super_block *sb = qctxt->lqc_sb;
 533         int err = 0;
 534         struct quota_adjust_qunit *oqaq = NULL;
 535         int rc1 = 0;
 536         ENTRY;
 537
 538         LASSERT(qdata);
 539         QDATA_DEBUG(qdata, "obd(%s): complete %s quota req\n",
 540                     obd->obd_name, (opc == QUOTA_DQACQ) ? "acq" : "rel");
 541
 542         /* update local operational quota file */
 543         if (rc == 0) {
 544                 __u64 count = QUSG(qdata->qd_count, QDATA_IS_BLK(qdata));
 545                 struct obd_quotactl *qctl;
 546                 __u64 *hardlimit;
 547
 548                 OBD_ALLOC_PTR(qctl);
 549                 if (qctl == NULL)
 550                         GOTO(out, err = -ENOMEM);
 551
 552                 /* acq/rel qunit for specified uid/gid is serialized,
 553                  * so there is no race between get fs quota limit and
 554                  * set fs quota limit */
 555                 qctl->qc_cmd = Q_GETQUOTA;
 556                 qctl->qc_id = qdata->qd_id;
 557                 qctl->qc_type = QDATA_IS_GRP(qdata);
 558                 err = fsfilt_quotactl(obd, sb, qctl);
 559                 if (err) {
 560                         CERROR("error get quota fs limit! (rc:%d)\n", err);
 561                         GOTO(out_mem, err);
 562                 }
 563
 564                 if (QDATA_IS_BLK(qdata)) {
 565                         qctl->qc_dqblk.dqb_valid = QIF_BLIMITS;
 566                         hardlimit = &qctl->qc_dqblk.dqb_bhardlimit;
 567                 } else {
 568                         qctl->qc_dqblk.dqb_valid = QIF_ILIMITS;
 569                         hardlimit = &qctl->qc_dqblk.dqb_ihardlimit;
 570                 }
 571
 572                 CDEBUG(D_QUOTA, "hardlimt: "LPU64"\n", *hardlimit);
 573
 574                 if (*hardlimit == 0)
 575                         goto out_mem;
 576
 577                 switch (opc) {
 578                 case QUOTA_DQACQ:
 579                         INC_QLIMIT(*hardlimit, count);
 580                         break;
 581                 case QUOTA_DQREL:
 582                         LASSERTF(count < *hardlimit,
 583                                  "id(%u) flag(%u) type(%c) isblk(%c) "
 584                                  "count("LPU64") qd_qunit("LPU64") "
 585                                  "hardlimit("LPU64").\n",
 586                                  qdata->qd_id, qdata->qd_flags,
 587                                  QDATA_IS_GRP(qdata) ? 'g' : 'u',
 588                                  QDATA_IS_BLK(qdata) ? 'b': 'i',
 589                                  qdata->qd_count, qdata->qd_qunit, *hardlimit);
 590                         *hardlimit -= count;
 591                         break;
 592                 default:
 593                         LBUG();
 594                 }
 595
 596                 /* clear quota limit */
 597                 if (count == 0)
 598                         *hardlimit = 0;
 599
 600                 qctl->qc_cmd = Q_SETQUOTA;
 601                 err = fsfilt_quotactl(obd, sb, qctl);
 602                 if (err)
 603                         CERROR("error set quota fs limit! (rc:%d)\n", err);
 604
 605                 QDATA_DEBUG(qdata, "%s completion\n",
 606                             opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 607 out_mem:
 608                 OBD_FREE_PTR(qctl);
 609         } else if (rc == -EDQUOT) {
 610                 QDATA_DEBUG(qdata, "acquire qunit got EDQUOT.\n");
 611         } else if (rc == -EBUSY) {
 612                 QDATA_DEBUG(qdata, "it's is recovering, got EBUSY.\n");
 613         } else {
 614                 CERROR("acquire qunit got error! (rc:%d)\n", rc);
 615         }
 616 out:
 617         /* remove the qunit from hash */
 618         spin_lock(&qunit_hash_lock);
 619
 620         qunit = dqacq_in_flight(qctxt, qdata);
 621         /* this qunit has been removed by qctxt_cleanup() */
 622         if (!qunit) {
 623                 spin_unlock(&qunit_hash_lock);
 624                 QDATA_DEBUG(qdata, "%s is discarded because qunit isn't found\n",
 625                             opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 626                 RETURN(err);
 627         }
 628
 629         LASSERT(opc == qunit->lq_opc);
 630         /* remove this qunit from lq_hash so that new processes cannot be added
 631          * to qunit->lq_waiters */
 632         remove_qunit_nolock(qunit);
 633         spin_unlock(&qunit_hash_lock);
 634
 635         compute_lqs_after_removing_qunit(qunit);
 636
 637         /* wake up all waiters */
 638         QUNIT_SET_STATE_AND_RC(qunit, QUNIT_FINISHED, rc);
 639         wake_up_all(&qunit->lq_waitq);
 640
 641         qunit_put(qunit);
 642         if (rc < 0 && rc != -EDQUOT)
 643                  RETURN(err);
 644
 645         /* don't reschedule in such cases:
 646          *   - acq/rel failure and qunit isn't changed,
 647          *     but not for quota recovery.
 648          *   - local dqacq/dqrel.
 649          *   - local disk io failure.
 650          */
 651          OBD_ALLOC_PTR(oqaq);
 652          if (!oqaq)
 653                  RETURN(-ENOMEM);
 654          qdata_to_oqaq(qdata, oqaq);
 655          /* adjust the qunit size in slaves */
 656          rc1 = quota_adjust_slave_lqs(oqaq, qctxt);
 657          OBD_FREE_PTR(oqaq);
 658          if (rc1 < 0) {
 659                  CERROR("adjust slave's qunit size failed!(rc:%d)\n", rc1);
 660                  RETURN(rc1);
 661          }
 662          if (err || (rc && rc != -EBUSY && rc1 == 0) || is_master(qctxt))
 663                 RETURN(err);
 664
 665         /* reschedule another dqacq/dqrel if needed */
 666         qdata->qd_count = 0;
 667         qdata->qd_flags &= LQUOTA_QUNIT_FLAGS;
 668         rc1 = check_cur_qunit(obd, qctxt, qdata);
 669         if (rc1 > 0) {
 670                 int opc;
 671                 opc = rc1 == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
 672                 rc1 = schedule_dqacq(obd, qctxt, qdata, opc, 0, NULL);
 673                 QDATA_DEBUG(qdata, "reschedudle opc(%d) rc(%d)\n", opc, rc1);
 674         }
 675         RETURN(err);
 676 }
 677
 678 struct dqacq_async_args {
 679         struct lustre_quota_ctxt *aa_ctxt;
 680         struct lustre_qunit *aa_qunit;
 681 };
 682
 683 static int dqacq_interpret(const struct lu_env *env,
 684                            struct ptlrpc_request *req, void *data, int rc)
 685 {
 686         struct dqacq_async_args *aa = (struct dqacq_async_args *)data;
 687         struct lustre_quota_ctxt *qctxt = aa->aa_ctxt;
 688         struct obd_device_target *obt = qctxt->lqc_obt;
 689         struct lustre_qunit *qunit = aa->aa_qunit;
 690         struct obd_device *obd = req->rq_import->imp_obd;
 691         struct qunit_data *qdata = NULL;
 692         int rc1 = 0;
 693         ENTRY;
 694
 695         LASSERT(req);
 696         LASSERT(req->rq_import);
 697
 698         /* there are several forms of qunit(historic causes), so we need to
 699          * adjust qunit from slaves to the same form here */
 700         OBD_ALLOC(qdata, sizeof(struct qunit_data));
 701         if (!qdata)
 702                 RETURN(-ENOMEM);
 703
 704         down_read(&obt->obt_rwsem);
 705         /* if a quota req timeouts or is dropped, we should update quota
 706          * statistics which will be handled in dqacq_completion. And in
 707          * this situation we should get qdata from request instead of
 708          * reply */
 709         rc1 = quota_get_qdata(req, qdata,
 710                               (rc != 0) ? QUOTA_REQUEST : QUOTA_REPLY,
 711                               QUOTA_IMPORT);
 712         if (rc1 < 0) {
 713                 DEBUG_REQ(D_ERROR, req,
 714                           "error unpacking qunit_data(rc: %d)\n", rc1);
 715                 GOTO(exit, rc = rc1);
 716         }
 717
 718         QDATA_DEBUG(qdata, "qdata: interpret rc(%d).\n", rc);
 719         QDATA_DEBUG((&qunit->lq_data), "lq_data: \n");
 720
 721         if (qdata->qd_id != qunit->lq_data.qd_id ||
 722             OBD_FAIL_CHECK(OBD_FAIL_QUOTA_RET_QDATA)) {
 723                 CDEBUG(D_ERROR, "the returned qd_id isn't expected!"
 724                        "(qdata: %u, lq_data: %u)\n", qdata->qd_id,
 725                        qunit->lq_data.qd_id);
 726                 qdata->qd_id = qunit->lq_data.qd_id;
 727                 rc = -EPROTO;
 728         }
 729         if (QDATA_IS_GRP(qdata) != QDATA_IS_GRP(&qunit->lq_data)) {
 730                 CDEBUG(D_ERROR, "the returned grp/usr isn't expected!"
 731                        "(qdata: %u, lq_data: %u)\n", qdata->qd_flags,
 732                        qunit->lq_data.qd_flags);
 733                 if (QDATA_IS_GRP(&qunit->lq_data))
 734                         QDATA_SET_GRP(qdata);
 735                 else
 736                         QDATA_CLR_GRP(qdata);
 737                 rc = -EPROTO;
 738         }
 739         if (qdata->qd_count > qunit->lq_data.qd_count) {
 740                 CDEBUG(D_ERROR, "the returned qd_count isn't expected!"
 741                        "(qdata: "LPU64", lq_data: "LPU64")\n", qdata->qd_count,
 742                        qunit->lq_data.qd_count);
 743                 rc = -EPROTO;
 744         }
 745
 746         rc = dqacq_completion(obd, qctxt, qdata, rc,
 747                               lustre_msg_get_opc(req->rq_reqmsg));
 748
 749 exit:
 750         up_read(&obt->obt_rwsem);
 751         OBD_FREE(qdata, sizeof(struct qunit_data));
 752
 753         RETURN(rc);
 754 }
 755
 756 /**
 757  * check if quota master is online
 758  */
 759 int check_qm(struct lustre_quota_ctxt *qctxt)
 760 {
 761         int rc;
 762         ENTRY;
 763
 764         spin_lock(&qctxt->lqc_lock);
 765         /* quit waiting when mds is back or qctxt is cleaned up */
 766         rc = qctxt->lqc_import || !qctxt->lqc_valid;
 767         spin_unlock(&qctxt->lqc_lock);
 768
 769         RETURN(rc);
 770 }
 771
 772 static int got_qunit(struct lustre_qunit *qunit)
 773 {
 774         int rc;
 775         ENTRY;
 776
 777         spin_lock(&qunit->lq_lock);
 778         switch (qunit->lq_state) {
 779         case QUNIT_IN_HASH:
 780         case QUNIT_RM_FROM_HASH:
 781                 rc = 0;
 782                 break;
 783         case QUNIT_FINISHED:
 784                 rc = 1;
 785                 break;
 786         default:
 787                 rc = 0;
 788                 CERROR("invalid qunit state %d\n", qunit->lq_state);
 789         }
 790         spin_unlock(&qunit->lq_lock);
 791         RETURN(rc);
 792 }
 793
 794 static int
 795 schedule_dqacq(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 796                struct qunit_data *qdata, int opc, int wait,
 797                struct obd_trans_info *oti)
 798 {
 799         struct lustre_qunit *qunit, *empty;
 800         struct l_wait_info lwi = { 0 };
 801         struct ptlrpc_request *req;
 802         struct dqacq_async_args *aa;
 803         struct obd_import *imp = NULL;
 804         struct lustre_qunit_size *lqs = NULL;
 805         struct timeval work_start;
 806         struct timeval work_end;
 807         long timediff;
 808         int rc = 0;
 809         ENTRY;
 810
 811         LASSERT(opc == QUOTA_DQACQ || opc == QUOTA_DQREL);
 812         do_gettimeofday(&work_start);
 813         if ((empty = alloc_qunit(qctxt, qdata, opc)) == NULL)
 814                 RETURN(-ENOMEM);
 815
 816         spin_lock(&qunit_hash_lock);
 817         qunit = dqacq_in_flight(qctxt, qdata);
 818         if (qunit) {
 819                 if (wait)
 820                         qunit_get(qunit);
 821                 spin_unlock(&qunit_hash_lock);
 822                 qunit_put(empty);
 823
 824                 goto wait_completion;
 825         }
 826         qunit = empty;
 827         insert_qunit_nolock(qctxt, qunit);
 828         spin_unlock(&qunit_hash_lock);
 829
 830         LASSERT(qunit);
 831
 832         quota_search_lqs(qdata, NULL, qctxt, &lqs);
 833         if (lqs) {
 834                 spin_lock(&lqs->lqs_lock);
 835                 quota_compute_lqs(qdata, lqs, 1, (opc == QUOTA_DQACQ) ? 1 : 0);
 836                 /* when this qdata returned from mds, it will call lqs_putref */
 837                 lqs_getref(lqs);
 838                 spin_unlock(&lqs->lqs_lock);
 839                 /* this is for quota_search_lqs */
 840                 lqs_putref(lqs);
 841         } else {
 842                 CDEBUG(D_ERROR, "Can't find the lustre qunit size!\n");
 843         }
 844
 845         QDATA_DEBUG(qdata, "obd(%s): send %s quota req\n",
 846                     obd->obd_name, (opc == QUOTA_DQACQ) ? "acq" : "rel");
 847         /* master is going to dqacq/dqrel from itself */
 848         if (is_master(qctxt)) {
 849                 int rc2;
 850                 QDATA_DEBUG(qdata, "local %s.\n",
 851                             opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 852                 QDATA_SET_CHANGE_QS(qdata);
 853                 rc = qctxt->lqc_handler(obd, qdata, opc);
 854                 rc2 = dqacq_completion(obd, qctxt, qdata, rc, opc);
 855                 do_gettimeofday(&work_end);
 856                 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
 857                 if (opc == QUOTA_DQACQ)
 858                         lprocfs_counter_add(qctxt->lqc_stats,
 859                                             wait ? LQUOTA_SYNC_ACQ : LQUOTA_ASYNC_ACQ,
 860                                             timediff);
 861                 else
 862                         lprocfs_counter_add(qctxt->lqc_stats,
 863                                             wait ? LQUOTA_SYNC_REL : LQUOTA_ASYNC_REL,
 864                                             timediff);
 865                 RETURN(rc ? rc : rc2);
 866         }
 867
 868         spin_lock(&qctxt->lqc_lock);
 869         if (!qctxt->lqc_import) {
 870                 spin_unlock(&qctxt->lqc_lock);
 871                 QDATA_DEBUG(qdata, "lqc_import is invalid.\n");
 872
 873                 spin_lock(&qunit_hash_lock);
 874                 remove_qunit_nolock(qunit);
 875                 spin_unlock(&qunit_hash_lock);
 876
 877                 compute_lqs_after_removing_qunit(qunit);
 878
 879                 QUNIT_SET_STATE_AND_RC(qunit, QUNIT_FINISHED, -EAGAIN);
 880                 wake_up_all(&qunit->lq_waitq);
 881
 882                 qunit_put(qunit);
 883                 spin_lock(&qctxt->lqc_lock);
 884                 if (wait && !qctxt->lqc_import) {
 885                         spin_unlock(&qctxt->lqc_lock);
 886
 887                         LASSERT(oti && oti->oti_thread &&
 888                                 oti->oti_thread->t_watchdog);
 889
 890                         lc_watchdog_disable(oti->oti_thread->t_watchdog);
 891                         CDEBUG(D_QUOTA, "sleep for quota master\n");
 892                         l_wait_event(qctxt->lqc_wait_for_qmaster,
 893                                      check_qm(qctxt), &lwi);
 894                         CDEBUG(D_QUOTA, "wake up when quota master is back\n");
 895                         lc_watchdog_touch(oti->oti_thread->t_watchdog);
 896                 } else {
 897                         spin_unlock(&qctxt->lqc_lock);
 898                 }
 899
 900                 RETURN(-EAGAIN);
 901         }
 902         imp = class_import_get(qctxt->lqc_import);
 903         spin_unlock(&qctxt->lqc_lock);
 904
 905         /* build dqacq/dqrel request */
 906         LASSERT(imp);
 907
 908         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_QUOTA_DQACQ,
 909                                         LUSTRE_MDS_VERSION, opc);
 910         class_import_put(imp);
 911         if (req == NULL) {
 912                 CDEBUG(D_ERROR, "Can't alloc request\n");
 913                 dqacq_completion(obd, qctxt, qdata, -ENOMEM, opc);
 914                 RETURN(-ENOMEM);
 915         }
 916
 917         ptlrpc_request_set_replen(req);
 918         req->rq_no_resend = req->rq_no_delay = 1;
 919         rc = quota_copy_qdata(req, qdata, QUOTA_REQUEST, QUOTA_IMPORT);
 920         if (rc < 0) {
 921                 CDEBUG(D_ERROR, "Can't pack qunit_data(rc: %d)\n", rc);
 922                 ptlrpc_req_finished(req);
 923                 dqacq_completion(obd, qctxt, qdata, -EPROTO, opc);
 924                 RETURN(rc);
 925         }
 926
 927         if (wait && qunit)
 928                 qunit_get(qunit);
 929
 930         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
 931         aa = ptlrpc_req_async_args(req);
 932         aa->aa_ctxt = qctxt;
 933         aa->aa_qunit = qunit;
 934
 935         req->rq_interpret_reply = dqacq_interpret;
 936         ptlrpcd_add_req(req, PSCOPE_OTHER);
 937
 938         QDATA_DEBUG(qdata, "%s scheduled.\n",
 939                     opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 940 wait_completion:
 941         if (wait && qunit) {
 942                 struct qunit_data *p = &qunit->lq_data;
 943
 944                 QDATA_DEBUG(p, "qunit(%p) is waiting for dqacq.\n", qunit);
 945                 l_wait_event(qunit->lq_waitq, got_qunit(qunit), &lwi);
 946                 /* rc = -EAGAIN, it means a quota req is finished;
 947                  * rc = -EDQUOT, it means out of quota
 948                  * rc = -EBUSY, it means recovery is happening
 949                  * other rc < 0, it means real errors, functions who call
 950                  * schedule_dqacq should take care of this */
 951                 spin_lock(&qunit->lq_lock);
 952                 if (qunit->lq_rc == 0)
 953                         rc = -EAGAIN;
 954                 else
 955                         rc = qunit->lq_rc;
 956                 spin_unlock(&qunit->lq_lock);
 957                 CDEBUG(D_QUOTA, "qunit(%p) finishes waiting. (rc:%d)\n",
 958                        qunit, rc);
 959                 qunit_put(qunit);
 960         }
 961
 962         do_gettimeofday(&work_end);
 963         timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
 964         if (opc == QUOTA_DQACQ)
 965                 lprocfs_counter_add(qctxt->lqc_stats,
 966                                     wait ? LQUOTA_SYNC_ACQ : LQUOTA_ASYNC_ACQ,
 967                                     timediff);
 968         else
 969                 lprocfs_counter_add(qctxt->lqc_stats,
 970                                     wait ? LQUOTA_SYNC_REL : LQUOTA_ASYNC_REL,
 971                                     timediff);
 972
 973         RETURN(rc);
 974 }
 975
 976 int
 977 qctxt_adjust_qunit(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 978                    uid_t uid, gid_t gid, __u32 isblk, int wait,
 979                    struct obd_trans_info *oti)
 980 {
 981         int rc = 0, i = USRQUOTA;
 982         __u32 id[MAXQUOTAS] = { uid, gid };
 983         struct qunit_data qdata[MAXQUOTAS];
 984         ENTRY;
 985
 986         CLASSERT(MAXQUOTAS < 4);
 987         if (!sb_any_quota_enabled(qctxt->lqc_sb))
 988                 RETURN(0);
 989
 990         for (i = 0; i < MAXQUOTAS; i++) {
 991                 qdata[i].qd_id = id[i];
 992                 qdata[i].qd_flags = i;
 993                 if (isblk)
 994                         QDATA_SET_BLK(&qdata[i]);
 995                 qdata[i].qd_count = 0;
 996
 997                 rc = check_cur_qunit(obd, qctxt, &qdata[i]);
 998                 if (rc > 0) {
 999                         int opc;
1000                         /* need acquire or release */
1001                         opc = rc == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
1002                         rc = schedule_dqacq(obd, qctxt, &qdata[i], opc,
1003                                             wait,oti);
1004                         if (rc < 0)
1005                                 RETURN(rc);
1006                 } else if (wait == 1) {
1007                         /* when wait equates 1, that means mds_quota_acquire
1008                          * or filter_quota_acquire is calling it. */
1009                         rc = qctxt_wait_pending_dqacq(qctxt, id[i], i, isblk);
1010                         if (rc < 0)
1011                                 RETURN(rc);
1012                 }
1013         }
1014
1015         RETURN(rc);
1016 }
1017
1018 int
1019 qctxt_wait_pending_dqacq(struct lustre_quota_ctxt *qctxt, unsigned int id,
1020                          unsigned short type, int isblk)
1021 {
1022         struct lustre_qunit *qunit = NULL;
1023         struct qunit_data qdata;
1024         struct timeval work_start;
1025         struct timeval work_end;
1026         long timediff;
1027         struct l_wait_info lwi = { 0 };
1028         int rc = 0;
1029         ENTRY;
1030
1031         do_gettimeofday(&work_start);
1032         qdata.qd_id = id;
1033         qdata.qd_flags = type;
1034         if (isblk)
1035                 QDATA_SET_BLK(&qdata);
1036         qdata.qd_count = 0;
1037
1038         spin_lock(&qunit_hash_lock);
1039         qunit = dqacq_in_flight(qctxt, &qdata);
1040         if (qunit)
1041                 /* grab reference on this qunit to handle races with
1042                  * dqacq_completion(). Otherwise, this qunit could be freed just
1043                  * after we release the qunit_hash_lock */
1044                 qunit_get(qunit);
1045         spin_unlock(&qunit_hash_lock);
1046
1047         if (qunit) {
1048                 struct qunit_data *p = &qunit->lq_data;
1049
1050                 QDATA_DEBUG(p, "qunit(%p) is waiting for dqacq.\n", qunit);
1051                 l_wait_event(qunit->lq_waitq, got_qunit(qunit), &lwi);
1052                 CDEBUG(D_QUOTA, "qunit(%p) finishes waiting. (rc:%d)\n",
1053                        qunit, qunit->lq_rc);
1054                 /* keep same as schedule_dqacq() b=17030 */
1055                 spin_lock(&qunit->lq_lock);
1056                 if (qunit->lq_rc == 0)
1057                         rc = -EAGAIN;
1058                 else
1059                         rc = qunit->lq_rc;
1060                 spin_unlock(&qunit->lq_lock);
1061                 qunit_put(qunit);
1062                 do_gettimeofday(&work_end);
1063                 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
1064                 lprocfs_counter_add(qctxt->lqc_stats,
1065                                     isblk ? LQUOTA_WAIT_PENDING_BLK_QUOTA :
1066                                             LQUOTA_WAIT_PENDING_INO_QUOTA,
1067                                     timediff);
1068         } else {
1069                 do_gettimeofday(&work_end);
1070                 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
1071                 lprocfs_counter_add(qctxt->lqc_stats,
1072                                     isblk ? LQUOTA_NOWAIT_PENDING_BLK_QUOTA :
1073                                             LQUOTA_NOWAIT_PENDING_INO_QUOTA,
1074                                     timediff);
1075         }
1076
1077         RETURN(rc);
1078 }
1079
1080 int
1081 qctxt_init(struct obd_device *obd, dqacq_handler_t handler)
1082 {
1083         struct lustre_quota_ctxt *qctxt = &obd->u.obt.obt_qctxt;
1084         struct obd_device_target *obt = &obd->u.obt;
1085         struct super_block *sb = obt->obt_sb;
1086         int rc = 0;
1087         ENTRY;
1088
1089         LASSERT(qctxt);
1090
1091         rc = ptlrpcd_addref();
1092         if (rc)
1093                 RETURN(rc);
1094
1095         cfs_waitq_init(&qctxt->lqc_wait_for_qmaster);
1096         spin_lock_init(&qctxt->lqc_lock);
1097         spin_lock(&qctxt->lqc_lock);
1098         qctxt->lqc_handler = handler;
1099         qctxt->lqc_sb = sb;
1100         qctxt->lqc_obt = obt;
1101         qctxt->lqc_import = NULL;
1102         qctxt->lqc_recovery = 0;
1103         qctxt->lqc_switch_qs = 1; /* Change qunit size in default setting */
1104         qctxt->lqc_valid = 1;
1105         qctxt->lqc_cqs_boundary_factor = 4;
1106         qctxt->lqc_cqs_least_bunit = PTLRPC_MAX_BRW_SIZE;
1107         qctxt->lqc_cqs_least_iunit = 2;
1108         qctxt->lqc_cqs_qs_factor = 2;
1109         qctxt->lqc_flags = 0;
1110         QUOTA_MASTER_UNREADY(qctxt);
1111         qctxt->lqc_bunit_sz = default_bunit_sz;
1112         qctxt->lqc_btune_sz = default_bunit_sz / 100 * default_btune_ratio;
1113         qctxt->lqc_iunit_sz = default_iunit_sz;
1114         qctxt->lqc_itune_sz = default_iunit_sz * default_itune_ratio / 100;
1115         qctxt->lqc_switch_seconds = 300; /* enlarging will wait 5 minutes
1116                                           * after the last shrinking */
1117         qctxt->lqc_sync_blk = 0;
1118         spin_unlock(&qctxt->lqc_lock);
1119
1120         qctxt->lqc_lqs_hash = lustre_hash_init("LQS_HASH", 7, 7,
1121                                                &lqs_hash_ops, 0);
1122         if (!qctxt->lqc_lqs_hash) {
1123                 CERROR("initialize hash lqs for %s error!\n", obd->obd_name);
1124                 RETURN(-ENOMEM);
1125         }
1126
1127 #ifdef LPROCFS
1128         rc = lquota_proc_setup(obd, is_master(qctxt));
1129         if (rc)
1130                 CERROR("initialize proc for %s error!\n", obd->obd_name);
1131 #endif
1132
1133         RETURN(rc);
1134 }
1135
1136 void qctxt_cleanup(struct lustre_quota_ctxt *qctxt, int force)
1137 {
1138         struct lustre_qunit *qunit, *tmp;
1139         struct list_head tmp_list;
1140         struct obd_device_target *obt = qctxt->lqc_obt;
1141         int i;
1142         ENTRY;
1143
1144         CFS_INIT_LIST_HEAD(&tmp_list);
1145
1146         spin_lock(&qctxt->lqc_lock);
1147         qctxt->lqc_valid = 0;
1148         spin_unlock(&qctxt->lqc_lock);
1149
1150         spin_lock(&qunit_hash_lock);
1151         for (i = 0; i < NR_DQHASH; i++) {
1152                 list_for_each_entry_safe(qunit, tmp, &qunit_hash[i], lq_hash) {
1153                         if (qunit->lq_ctxt != qctxt)
1154                                 continue;
1155                         remove_qunit_nolock(qunit);
1156                         list_add(&qunit->lq_hash, &tmp_list);
1157                 }
1158         }
1159         spin_unlock(&qunit_hash_lock);
1160
1161         list_for_each_entry_safe(qunit, tmp, &tmp_list, lq_hash) {
1162                 list_del_init(&qunit->lq_hash);
1163                 compute_lqs_after_removing_qunit(qunit);
1164
1165                 /* wake up all waiters */
1166                 QUNIT_SET_STATE_AND_RC(qunit, QUNIT_FINISHED, 0);
1167                 wake_up_all(&qunit->lq_waitq);
1168                 qunit_put(qunit);
1169         }
1170
1171         down_write(&obt->obt_rwsem);
1172         lustre_hash_exit(qctxt->lqc_lqs_hash);
1173         qctxt->lqc_lqs_hash = NULL;
1174         up_write(&obt->obt_rwsem);
1175
1176         /* after qctxt_cleanup, qctxt might be freed, then check_qm() is
1177          * unpredicted. So we must wait until lqc_wait_for_qmaster is empty */
1178         while (cfs_waitq_active(&qctxt->lqc_wait_for_qmaster)) {
1179                 cfs_waitq_signal(&qctxt->lqc_wait_for_qmaster);
1180                 cfs_schedule_timeout(CFS_TASK_INTERRUPTIBLE,
1181                                      cfs_time_seconds(1));
1182         }
1183
1184         ptlrpcd_decref();
1185
1186 #ifdef LPROCFS
1187         if (lquota_proc_cleanup(qctxt))
1188                 CERROR("cleanup proc error!\n");
1189 #endif
1190
1191         EXIT;
1192 }
1193
1194 struct qslave_recov_thread_data {
1195         struct obd_device *obd;
1196         struct lustre_quota_ctxt *qctxt;
1197         struct completion comp;
1198 };
1199
1200 /* FIXME only recovery block quota by now */
1201 static int qslave_recovery_main(void *arg)
1202 {
1203         struct qslave_recov_thread_data *data = arg;
1204         struct obd_device *obd = data->obd;
1205         struct lustre_quota_ctxt *qctxt = data->qctxt;
1206         unsigned int type;
1207         int rc = 0;
1208         ENTRY;
1209
1210         ptlrpc_daemonize("qslave_recovd");
1211
1212         complete(&data->comp);
1213
1214         if (qctxt->lqc_recovery)
1215                 RETURN(0);
1216         qctxt->lqc_recovery = 1;
1217
1218         for (type = USRQUOTA; type < MAXQUOTAS; type++) {
1219                 struct qunit_data qdata;
1220                 struct quota_info *dqopt = sb_dqopt(qctxt->lqc_sb);
1221                 struct list_head id_list;
1222                 struct dquot_id *dqid, *tmp;
1223                 int ret;
1224
1225                 LOCK_DQONOFF_MUTEX(dqopt);
1226                 if (!sb_has_quota_enabled(qctxt->lqc_sb, type)) {
1227                         UNLOCK_DQONOFF_MUTEX(dqopt);
1228                         break;
1229                 }
1230
1231                 LASSERT(dqopt->files[type] != NULL);
1232                 CFS_INIT_LIST_HEAD(&id_list);
1233 #ifndef KERNEL_SUPPORTS_QUOTA_READ
1234                 rc = fsfilt_qids(obd, dqopt->files[type], NULL, type, &id_list);
1235 #else
1236                 rc = fsfilt_qids(obd, NULL, dqopt->files[type], type, &id_list);
1237 #endif
1238                 UNLOCK_DQONOFF_MUTEX(dqopt);
1239                 if (rc)
1240                         CERROR("Get ids from quota file failed. (rc:%d)\n", rc);
1241
1242                 list_for_each_entry_safe(dqid, tmp, &id_list, di_link) {
1243                         list_del_init(&dqid->di_link);
1244                         /* skip slave recovery on itself */
1245                         if (is_master(qctxt))
1246                                 goto free;
1247                         if (rc && rc != -EBUSY)
1248                                 goto free;
1249
1250                         qdata.qd_id = dqid->di_id;
1251                         qdata.qd_flags = type;
1252                         QDATA_SET_BLK(&qdata);
1253                         qdata.qd_count = 0;
1254
1255                         ret = check_cur_qunit(obd, qctxt, &qdata);
1256                         if (ret > 0) {
1257                                 int opc;
1258                                 opc = ret == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
1259                                 rc = schedule_dqacq(obd, qctxt, &qdata, opc,
1260                                                     0, NULL);
1261                                 if (rc == -EDQUOT)
1262                                         rc = 0;
1263                         } else {
1264                                 rc = 0;
1265                         }
1266
1267                         if (rc)
1268                                 CDEBUG(rc == -EBUSY ? D_QUOTA : D_ERROR,
1269                                        "qslave recovery failed! (id:%d type:%d "
1270                                        " rc:%d)\n", dqid->di_id, type, rc);
1271 free:
1272                         kfree(dqid);
1273                 }
1274         }
1275
1276         qctxt->lqc_recovery = 0;
1277         RETURN(rc);
1278 }
1279
1280 void
1281 qslave_start_recovery(struct obd_device *obd, struct lustre_quota_ctxt *qctxt)
1282 {
1283         struct qslave_recov_thread_data data;
1284         int rc;
1285         ENTRY;
1286
1287         if (!sb_any_quota_enabled(qctxt->lqc_sb))
1288                 goto exit;
1289
1290         data.obd = obd;
1291         data.qctxt = qctxt;
1292         init_completion(&data.comp);
1293
1294         rc = kernel_thread(qslave_recovery_main, &data, CLONE_VM|CLONE_FILES);
1295         if (rc < 0) {
1296                 CERROR("Cannot start quota recovery thread: rc %d\n", rc);
1297                 goto exit;
1298         }
1299         wait_for_completion(&data.comp);
1300 exit:
1301         EXIT;
1302 }
1303
1304
1305 /**
1306  * lqs<->qctxt hash operations
1307  */
1308
1309 /**
1310  * string hashing using djb2 hash algorithm
1311  */
1312 static unsigned
1313 lqs_hash(lustre_hash_t *lh, void *key, unsigned mask)
1314 {
1315         struct quota_adjust_qunit *lqs_key;
1316         unsigned hash;
1317         ENTRY;
1318
1319         LASSERT(key);
1320         lqs_key = (struct quota_adjust_qunit *)key;
1321         hash = (QAQ_IS_GRP(lqs_key) ? 5381 : 5387) * lqs_key->qaq_id;
1322
1323         RETURN(hash & mask);
1324 }
1325
1326 static int
1327 lqs_compare(void *key, struct hlist_node *hnode)
1328 {
1329         struct quota_adjust_qunit *lqs_key;
1330         struct lustre_qunit_size *q;
1331         int rc;
1332         ENTRY;
1333
1334         LASSERT(key);
1335         lqs_key = (struct quota_adjust_qunit *)key;
1336         q = hlist_entry(hnode, struct lustre_qunit_size, lqs_hash);
1337
1338         spin_lock(&q->lqs_lock);
1339         rc = ((lqs_key->qaq_id == q->lqs_id) &&
1340               (QAQ_IS_GRP(lqs_key) == LQS_IS_GRP(q)));
1341         spin_unlock(&q->lqs_lock);
1342
1343         RETURN(rc);
1344 }
1345
1346 static void *
1347 lqs_get(struct hlist_node *hnode)
1348 {
1349         struct lustre_qunit_size *q =
1350             hlist_entry(hnode, struct lustre_qunit_size, lqs_hash);
1351         ENTRY;
1352
1353         atomic_inc(&q->lqs_refcount);
1354         CDEBUG(D_QUOTA, "lqs=%p refcount %d\n",
1355                q, atomic_read(&q->lqs_refcount));
1356
1357         RETURN(q);
1358 }
1359
1360 static void *
1361 lqs_put(struct hlist_node *hnode)
1362 {
1363         struct lustre_qunit_size *q =
1364             hlist_entry(hnode, struct lustre_qunit_size, lqs_hash);
1365         ENTRY;
1366
1367         LASSERT(atomic_read(&q->lqs_refcount) > 0);
1368         atomic_dec(&q->lqs_refcount);
1369         CDEBUG(D_QUOTA, "lqs=%p refcount %d\n",
1370                q, atomic_read(&q->lqs_refcount));
1371
1372         RETURN(q);
1373 }
1374
1375 static void
1376 lqs_exit(struct hlist_node *hnode)
1377 {
1378         struct lustre_qunit_size *q;
1379         ENTRY;
1380
1381         q = hlist_entry(hnode, struct lustre_qunit_size, lqs_hash);
1382         /*
1383          * Nothing should be left. User of lqs put it and
1384          * lqs also was deleted from table by this time
1385          * so we should have 0 refs.
1386          */
1387         LASSERTF(atomic_read(&q->lqs_refcount) == 0,
1388                  "Busy lqs %p with %d refs\n", q,
1389                  atomic_read(&q->lqs_refcount));
1390         OBD_FREE_PTR(q);
1391         EXIT;
1392 }
1393
1394 static lustre_hash_ops_t lqs_hash_ops = {
1395         .lh_hash    = lqs_hash,
1396         .lh_compare = lqs_compare,
1397         .lh_get     = lqs_get,
1398         .lh_put     = lqs_put,
1399         .lh_exit    = lqs_exit
1400 };
1401 #endif /* HAVE_QUOTA_SUPPORT */