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  *  lustre/quota/quota_context.c
   5  *  Lustre Quota Context
   6  *
   7  *  Copyright (c) 2001-2005 Cluster File Systems, Inc.
   8  *   Author: Niu YaWei <niu@clusterfs.com>
   9  *
  10  *   This file is part of Lustre, http://www.lustre.org.
  11  *
  12  *   No redistribution or use is permitted outside of Cluster File Systems, Inc.
  13  *
  14  */
  15 #ifndef EXPORT_SYMTAB
  16 # define EXPORT_SYMTAB
  17 #endif
  18
  19 #define DEBUG_SUBSYSTEM S_MDS
  20
  21 #include <linux/version.h>
  22 #include <linux/fs.h>
  23 #include <asm/unistd.h>
  24 #include <linux/slab.h>
  25 #include <linux/quotaops.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28
  29 #include <obd_class.h>
  30 #include <lustre_quota.h>
  31 #include <lustre_fsfilt.h>
  32 #include "quota_internal.h"
  33
  34 unsigned long default_bunit_sz = 100 * 1024 * 1024;       /* 100M bytes */
  35 unsigned long default_btune_ratio = 50;                   /* 50 percentage */
  36 unsigned long default_iunit_sz = 5000;       /* 5000 inodes */
  37 unsigned long default_itune_ratio = 50;      /* 50 percentage */
  38
  39 cfs_mem_cache_t *qunit_cachep = NULL;
  40 struct list_head qunit_hash[NR_DQHASH];
  41 spinlock_t qunit_hash_lock = SPIN_LOCK_UNLOCKED;
  42
  43 struct lustre_qunit {
  44         struct list_head lq_hash;               /* Hash list in memory */
  45         atomic_t lq_refcnt;                     /* Use count */
  46         struct lustre_quota_ctxt *lq_ctxt;      /* Quota context this applies to */
  47         struct qunit_data lq_data;              /* See qunit_data */
  48         unsigned int lq_opc;                    /* QUOTA_DQACQ, QUOTA_DQREL */
  49         struct list_head lq_waiters;            /* All write threads waiting for this qunit */
  50 };
  51
  52 int should_translate_quota (struct obd_import *imp)
  53 {
  54         ENTRY;
  55
  56         LASSERT(imp);
  57         if ((imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_QUOTA64) &&
  58             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT))
  59                 RETURN(0);
  60         else
  61                 RETURN(1);
  62 }
  63
  64 void qunit_cache_cleanup(void)
  65 {
  66         int i;
  67         ENTRY;
  68
  69         spin_lock(&qunit_hash_lock);
  70         for (i = 0; i < NR_DQHASH; i++)
  71                 LASSERT(list_empty(qunit_hash + i));
  72         spin_unlock(&qunit_hash_lock);
  73
  74         if (qunit_cachep) {
  75                 int rc;
  76                 rc = cfs_mem_cache_destroy(qunit_cachep);
  77                 LASSERTF(rc == 0, "couldn't destory qunit_cache slab\n");
  78                 qunit_cachep = NULL;
  79         }
  80         EXIT;
  81 }
  82
  83 int qunit_cache_init(void)
  84 {
  85         int i;
  86         ENTRY;
  87
  88         LASSERT(qunit_cachep == NULL);
  89         qunit_cachep = cfs_mem_cache_create("ll_qunit_cache",
  90                                          sizeof(struct lustre_qunit),
  91                                          0, 0);
  92         if (!qunit_cachep)
  93                 RETURN(-ENOMEM);
  94
  95         spin_lock(&qunit_hash_lock);
  96         for (i = 0; i < NR_DQHASH; i++)
  97                 INIT_LIST_HEAD(qunit_hash + i);
  98         spin_unlock(&qunit_hash_lock);
  99         RETURN(0);
 100 }
 101
 102 static inline int
 103 qunit_hashfn(struct lustre_quota_ctxt *qctxt, struct qunit_data *qdata)
 104              __attribute__((__const__));
 105
 106 static inline int
 107 qunit_hashfn(struct lustre_quota_ctxt *qctxt, struct qunit_data *qdata)
 108 {
 109         unsigned int id = qdata->qd_id;
 110         unsigned int type = qdata->qd_flags & QUOTA_IS_GRP;
 111
 112         unsigned long tmp = ((unsigned long)qctxt >> L1_CACHE_SHIFT) ^ id;
 113         tmp = (tmp * (MAXQUOTAS - type)) % NR_DQHASH;
 114         return tmp;
 115 }
 116
 117 /* compute the remaining quota for certain gid or uid b=11693 */
 118 int compute_remquota(struct obd_device *obd,
 119                      struct lustre_quota_ctxt *qctxt, struct qunit_data *qdata)
 120 {
 121         struct super_block *sb = qctxt->lqc_sb;
 122         __u64 usage, limit;
 123         struct obd_quotactl *qctl;
 124         int ret = QUOTA_RET_OK;
 125         __u32 qdata_type = qdata->qd_flags & QUOTA_IS_GRP;
 126         ENTRY;
 127
 128         if (!sb_any_quota_enabled(sb))
 129                 RETURN(QUOTA_RET_NOQUOTA);
 130
 131         /* ignore root user */
 132         if (qdata->qd_id == 0 && qdata_type == USRQUOTA)
 133                 RETURN(QUOTA_RET_NOLIMIT);
 134
 135         OBD_ALLOC_PTR(qctl);
 136         if (qctl == NULL)
 137                 RETURN(-ENOMEM);
 138
 139         /* get fs quota usage & limit */
 140         qctl->qc_cmd = Q_GETQUOTA;
 141         qctl->qc_id = qdata->qd_id;
 142         qctl->qc_type = qdata_type;
 143         ret = fsfilt_quotactl(obd, sb, qctl);
 144         if (ret) {
 145                 if (ret == -ESRCH)      /* no limit */
 146                         ret = QUOTA_RET_NOLIMIT;
 147                 else
 148                         CDEBUG(D_QUOTA, "can't get fs quota usage! (rc:%d)",
 149                                ret);
 150                 GOTO(out, ret);
 151         }
 152
 153         usage = qctl->qc_dqblk.dqb_curspace;
 154         limit = qctl->qc_dqblk.dqb_bhardlimit << QUOTABLOCK_BITS;
 155         if (!limit){            /* no limit */
 156                 ret = QUOTA_RET_NOLIMIT;
 157                 GOTO(out, ret);
 158         }
 159
 160         if (limit >= usage)
 161                 qdata->qd_count = limit - usage;
 162         else
 163                 qdata->qd_count = 0;
 164         EXIT;
 165 out:
 166         OBD_FREE_PTR(qctl);
 167         return ret;
 168 }
 169
 170 /* caller must hold qunit_hash_lock */
 171 static inline struct lustre_qunit *find_qunit(unsigned int hashent,
 172                                               struct lustre_quota_ctxt *qctxt,
 173                                               struct qunit_data *qdata)
 174 {
 175         struct lustre_qunit *qunit = NULL;
 176         struct qunit_data *tmp;
 177
 178         LASSERT_SPIN_LOCKED(&qunit_hash_lock);
 179         list_for_each_entry(qunit, qunit_hash + hashent, lq_hash) {
 180                 tmp = &qunit->lq_data;
 181                 if (qunit->lq_ctxt == qctxt &&
 182                     qdata->qd_id == tmp->qd_id && qdata->qd_flags == tmp->qd_flags)
 183                         return qunit;
 184         }
 185         return NULL;
 186 }
 187
 188 /* check_cur_qunit - check the current usage of qunit.
 189  * @qctxt: quota context
 190  * @qdata: the type of quota unit to be checked
 191  *
 192  * return: 1 - need acquire qunit;
 193  *         2 - need release qunit;
 194  *         0 - need do nothing.
 195  *       < 0 - error.
 196  */
 197 static int
 198 check_cur_qunit(struct obd_device *obd,
 199                 struct lustre_quota_ctxt *qctxt, struct qunit_data *qdata)
 200 {
 201         struct super_block *sb = qctxt->lqc_sb;
 202         unsigned long qunit_sz, tune_sz;
 203         __u64 usage, limit;
 204         struct obd_quotactl *qctl;
 205         int ret = 0;
 206         __u32 qdata_type = qdata->qd_flags & QUOTA_IS_GRP;
 207         __u32 is_blk = (qdata->qd_flags & QUOTA_IS_BLOCK) >> 1;
 208         ENTRY;
 209
 210         if (!sb_any_quota_enabled(sb))
 211                 RETURN(0);
 212
 213         /* ignore root user */
 214         if (qdata->qd_id == 0 && qdata_type == USRQUOTA)
 215                 RETURN(0);
 216
 217         OBD_ALLOC_PTR(qctl);
 218         if (qctl == NULL)
 219                 RETURN(-ENOMEM);
 220
 221         /* get fs quota usage & limit */
 222         qctl->qc_cmd = Q_GETQUOTA;
 223         qctl->qc_id = qdata->qd_id;
 224         qctl->qc_type = qdata_type;
 225         ret = fsfilt_quotactl(obd, sb, qctl);
 226         if (ret) {
 227                 if (ret == -ESRCH)      /* no limit */
 228                         ret = 0;
 229                 else
 230                         CERROR("can't get fs quota usage! (rc:%d)\n", ret);
 231                 GOTO(out, ret);
 232         }
 233
 234         if (is_blk) {
 235                 usage = qctl->qc_dqblk.dqb_curspace;
 236                 limit = qctl->qc_dqblk.dqb_bhardlimit << QUOTABLOCK_BITS;
 237                 qunit_sz = qctxt->lqc_bunit_sz;
 238                 tune_sz = qctxt->lqc_btune_sz;
 239
 240                 LASSERT(!(qunit_sz % QUOTABLOCK_SIZE));
 241         } else {
 242                 usage = qctl->qc_dqblk.dqb_curinodes;
 243                 limit = qctl->qc_dqblk.dqb_ihardlimit;
 244                 qunit_sz = qctxt->lqc_iunit_sz;
 245                 tune_sz = qctxt->lqc_itune_sz;
 246         }
 247
 248         /* ignore the no quota limit case */
 249         if (!limit)
 250                 GOTO(out, ret = 0);
 251
 252         /* we don't count the MIN_QLIMIT */
 253         if ((limit == MIN_QLIMIT && !is_blk) ||
 254             (toqb(limit) == MIN_QLIMIT && is_blk))
 255                 limit = 0;
 256
 257         LASSERT(qdata->qd_count == 0);
 258         if (limit <= usage + tune_sz) {
 259                 while (qdata->qd_count + limit <= usage + tune_sz)
 260                         qdata->qd_count += qunit_sz;
 261                 ret = 1;
 262         } else if (limit > usage + qunit_sz + tune_sz) {
 263                 while (limit - qdata->qd_count > usage + qunit_sz + tune_sz)
 264                         qdata->qd_count += qunit_sz;
 265                 ret = 2;
 266         }
 267         LASSERT(ret == 0 || qdata->qd_count);
 268         EXIT;
 269 out:
 270         OBD_FREE_PTR(qctl);
 271         return ret;
 272 }
 273
 274 /* caller must hold qunit_hash_lock */
 275 static struct lustre_qunit *dqacq_in_flight(struct lustre_quota_ctxt *qctxt,
 276                                             struct qunit_data *qdata)
 277 {
 278         unsigned int hashent = qunit_hashfn(qctxt, qdata);
 279         struct lustre_qunit *qunit;
 280         ENTRY;
 281
 282         LASSERT_SPIN_LOCKED(&qunit_hash_lock);
 283         qunit = find_qunit(hashent, qctxt, qdata);
 284         RETURN(qunit);
 285 }
 286
 287 static struct lustre_qunit *alloc_qunit(struct lustre_quota_ctxt *qctxt,
 288                                         struct qunit_data *qdata, int opc)
 289 {
 290         struct lustre_qunit *qunit = NULL;
 291         ENTRY;
 292
 293         OBD_SLAB_ALLOC(qunit, qunit_cachep, CFS_ALLOC_IO, sizeof(*qunit));
 294         if (qunit == NULL)
 295                 RETURN(NULL);
 296
 297         INIT_LIST_HEAD(&qunit->lq_hash);
 298         INIT_LIST_HEAD(&qunit->lq_waiters);
 299         atomic_set(&qunit->lq_refcnt, 1);
 300         qunit->lq_ctxt = qctxt;
 301         memcpy(&qunit->lq_data, qdata, sizeof(*qdata));
 302         qunit->lq_opc = opc;
 303
 304         RETURN(qunit);
 305 }
 306
 307 static inline void free_qunit(struct lustre_qunit *qunit)
 308 {
 309         OBD_SLAB_FREE(qunit, qunit_cachep, sizeof(*qunit));
 310 }
 311
 312 static inline void qunit_get(struct lustre_qunit *qunit)
 313 {
 314         atomic_inc(&qunit->lq_refcnt);
 315 }
 316
 317 static void qunit_put(struct lustre_qunit *qunit)
 318 {
 319         LASSERT(atomic_read(&qunit->lq_refcnt));
 320         if (atomic_dec_and_test(&qunit->lq_refcnt))
 321                 free_qunit(qunit);
 322 }
 323
 324 static void
 325 insert_qunit_nolock(struct lustre_quota_ctxt *qctxt, struct lustre_qunit *qunit)
 326 {
 327         struct list_head *head;
 328
 329         LASSERT(list_empty(&qunit->lq_hash));
 330         head = qunit_hash + qunit_hashfn(qctxt, &qunit->lq_data);
 331         list_add(&qunit->lq_hash, head);
 332 }
 333
 334 static void remove_qunit_nolock(struct lustre_qunit *qunit)
 335 {
 336         LASSERT(!list_empty(&qunit->lq_hash));
 337         list_del_init(&qunit->lq_hash);
 338 }
 339
 340 struct qunit_waiter {
 341         struct list_head qw_entry;
 342         cfs_waitq_t      qw_waitq;
 343         int qw_rc;
 344 };
 345
 346 #define INC_QLIMIT(limit, count) (limit == MIN_QLIMIT) ? \
 347                                  (limit = count) : (limit += count)
 348
 349
 350 /* FIXME check if this mds is the master of specified id */
 351 static int
 352 is_master(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 353           unsigned int id, int type)
 354 {
 355         return qctxt->lqc_handler ? 1 : 0;
 356 }
 357
 358 static int
 359 schedule_dqacq(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 360                struct qunit_data *qdata, int opc, int wait);
 361
 362 static int split_before_schedule_dqacq(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 363                                        struct qunit_data *qdata, int opc, int wait)
 364 {
 365         int rc = 0, ret;
 366         struct qunit_data tmp_qdata;
 367         ENTRY;
 368
 369         LASSERT(qdata);
 370         if (qctxt->lqc_import)
 371                 while (should_translate_quota(qctxt->lqc_import) &&
 372                        qdata->qd_count > MAX_QUOTA_COUNT32) {
 373
 374                         tmp_qdata = *qdata;
 375                         tmp_qdata.qd_count = MAX_QUOTA_COUNT32;
 376                         qdata->qd_count -= tmp_qdata.qd_count;
 377                         ret = schedule_dqacq(obd, qctxt, &tmp_qdata, opc, wait);
 378                         if (!rc)
 379                                 rc = ret;
 380                 }
 381
 382         if (qdata->qd_count){
 383                 ret = schedule_dqacq(obd, qctxt, qdata, opc, wait);
 384                 if (!rc)
 385                         rc = ret;
 386         }
 387
 388         RETURN(rc);
 389 }
 390
 391 static int
 392 dqacq_completion(struct obd_device *obd,
 393                  struct lustre_quota_ctxt *qctxt,
 394                  struct qunit_data *qdata, int rc, int opc)
 395 {
 396         struct lustre_qunit *qunit = NULL;
 397         struct super_block *sb = qctxt->lqc_sb;
 398         unsigned long qunit_sz;
 399         struct qunit_waiter *qw, *tmp;
 400         int err = 0;
 401         __u32 qdata_type = qdata->qd_flags & QUOTA_IS_GRP;
 402         __u32 is_blk = (qdata->qd_flags & QUOTA_IS_BLOCK) >> 1;
 403         __u64 qd_tmp = qdata->qd_count;
 404         unsigned long div_r;
 405         ENTRY;
 406
 407         LASSERT(qdata);
 408         qunit_sz = is_blk ? qctxt->lqc_bunit_sz : qctxt->lqc_iunit_sz;
 409         div_r = do_div(qd_tmp, qunit_sz);
 410         LASSERT(!div_r);
 411
 412         /* update local operational quota file */
 413         if (rc == 0) {
 414                 __u32 count = QUSG(qdata->qd_count, is_blk);
 415                 struct obd_quotactl *qctl;
 416                 __u64 *hardlimit;
 417
 418                 OBD_ALLOC_PTR(qctl);
 419                 if (qctl == NULL)
 420                         GOTO(out, err = -ENOMEM);
 421
 422                 /* acq/rel qunit for specified uid/gid is serialized,
 423                  * so there is no race between get fs quota limit and
 424                  * set fs quota limit */
 425                 qctl->qc_cmd = Q_GETQUOTA;
 426                 qctl->qc_id = qdata->qd_id;
 427                 qctl->qc_type = qdata_type;
 428                 err = fsfilt_quotactl(obd, sb, qctl);
 429                 if (err) {
 430                         CERROR("error get quota fs limit! (rc:%d)\n", err);
 431                         GOTO(out_mem, err);
 432                 }
 433
 434                 if (is_blk) {
 435                         qctl->qc_dqblk.dqb_valid = QIF_BLIMITS;
 436                         hardlimit = &qctl->qc_dqblk.dqb_bhardlimit;
 437                 } else {
 438                         qctl->qc_dqblk.dqb_valid = QIF_ILIMITS;
 439                         hardlimit = &qctl->qc_dqblk.dqb_ihardlimit;
 440                 }
 441
 442                 switch (opc) {
 443                 case QUOTA_DQACQ:
 444                         INC_QLIMIT(*hardlimit, count);
 445                         break;
 446                 case QUOTA_DQREL:
 447                         LASSERT(count < *hardlimit);
 448                         *hardlimit -= count;
 449                         break;
 450                 default:
 451                         LBUG();
 452                 }
 453
 454                 /* clear quota limit */
 455                 if (count == 0)
 456                         *hardlimit = 0;
 457
 458                 qctl->qc_cmd = Q_SETQUOTA;
 459                 err = fsfilt_quotactl(obd, sb, qctl);
 460                 if (err)
 461                         CERROR("error set quota fs limit! (rc:%d)\n", err);
 462
 463                 QDATA_DEBUG(qdata, "%s completion\n",
 464                             opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 465 out_mem:
 466                 OBD_FREE_PTR(qctl);
 467         } else if (rc == -EDQUOT) {
 468                 QDATA_DEBUG(qdata, "acquire qunit got EDQUOT.\n");
 469         } else if (rc == -EBUSY) {
 470                 QDATA_DEBUG(qdata, "it's is recovering, got EBUSY.\n");
 471         } else {
 472                 CERROR("acquire qunit got error! (rc:%d)\n", rc);
 473         }
 474 out:
 475         /* remove the qunit from hash */
 476         spin_lock(&qunit_hash_lock);
 477
 478         qunit = dqacq_in_flight(qctxt, qdata);
 479         /* this qunit has been removed by qctxt_cleanup() */
 480         if (!qunit) {
 481                 spin_unlock(&qunit_hash_lock);
 482                 RETURN(err);
 483         }
 484
 485         LASSERT(opc == qunit->lq_opc);
 486         remove_qunit_nolock(qunit);
 487
 488         /* wake up all waiters */
 489         list_for_each_entry_safe(qw, tmp, &qunit->lq_waiters, qw_entry) {
 490                 list_del_init(&qw->qw_entry);
 491                 qw->qw_rc = rc;
 492                 wake_up(&qw->qw_waitq);
 493         }
 494
 495         spin_unlock(&qunit_hash_lock);
 496
 497         qunit_put(qunit);
 498
 499         /* don't reschedule in such cases:
 500          *   - acq/rel failure, but not for quota recovery.
 501          *   - local dqacq/dqrel.
 502          *   - local disk io failure.
 503          */
 504         if (err || (rc && rc != -EBUSY) ||
 505             is_master(obd, qctxt, qdata->qd_id, qdata_type))
 506                 RETURN(err);
 507
 508         /* reschedule another dqacq/dqrel if needed */
 509         qdata->qd_count = 0;
 510         rc = check_cur_qunit(obd, qctxt, qdata);
 511         if (rc > 0) {
 512                 int opc;
 513                 opc = rc == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
 514                 rc = split_before_schedule_dqacq(obd, qctxt, qdata, opc, 0);
 515                 QDATA_DEBUG(qdata, "reschedudle opc(%d) rc(%d)\n", opc, rc);
 516         }
 517         RETURN(err);
 518 }
 519
 520 struct dqacq_async_args {
 521         struct lustre_quota_ctxt *aa_ctxt;
 522         struct lustre_qunit *aa_qunit;
 523 };
 524
 525 static int dqacq_interpret(struct ptlrpc_request *req, void *data, int rc)
 526 {
 527         struct dqacq_async_args *aa = (struct dqacq_async_args *)data;
 528         struct lustre_quota_ctxt *qctxt = aa->aa_ctxt;
 529         struct lustre_qunit *qunit = aa->aa_qunit;
 530         struct obd_device *obd = req->rq_import->imp_obd;
 531         struct qunit_data *qdata = NULL;
 532         struct qunit_data_old *qdata_old = NULL;
 533         ENTRY;
 534
 535         LASSERT(req);
 536         LASSERT(req->rq_import);
 537         if ((req->rq_import->imp_connect_data.ocd_connect_flags & OBD_CONNECT_QUOTA64)  &&
 538             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
 539                 CDEBUG(D_QUOTA, "qd_count is 64bit!\n");
 540                 qdata = lustre_swab_reqbuf(req, REPLY_REC_OFF, sizeof(*qdata), lustre_swab_qdata);
 541         } else {
 542                 CDEBUG(D_QUOTA, "qd_count is 32bit!\n");
 543                 qdata_old = lustre_swab_reqbuf(req, REPLY_REC_OFF, sizeof(struct qunit_data_old),
 544                                                lustre_swab_qdata_old);
 545                 qdata = lustre_quota_old_to_new(qdata_old);
 546         }
 547         if (qdata == NULL) {
 548                 DEBUG_REQ(D_ERROR, req, "error unpacking qunit_data");
 549                 RETURN(-EPROTO);
 550         }
 551
 552         LASSERT(qdata->qd_id == qunit->lq_data.qd_id &&
 553                 (qdata->qd_flags & QUOTA_IS_GRP) == (qunit->lq_data.qd_flags & QUOTA_IS_GRP) &&
 554                 (qdata->qd_count == qunit->lq_data.qd_count ||
 555                  qdata->qd_count == 0));
 556
 557         QDATA_DEBUG(qdata, "%s interpret rc(%d).\n",
 558                     lustre_msg_get_opc(req->rq_reqmsg) == QUOTA_DQACQ ?
 559                     "DQACQ" : "DQREL", rc);
 560
 561         rc = dqacq_completion(obd, qctxt, qdata, rc,
 562                               lustre_msg_get_opc(req->rq_reqmsg));
 563
 564         RETURN(rc);
 565 }
 566
 567 static int got_qunit(struct qunit_waiter *waiter)
 568 {
 569         int rc = 0;
 570         ENTRY;
 571         spin_lock(&qunit_hash_lock);
 572         rc = list_empty(&waiter->qw_entry);
 573         spin_unlock(&qunit_hash_lock);
 574         RETURN(rc);
 575 }
 576
 577 static int
 578 schedule_dqacq(struct obd_device *obd,
 579                struct lustre_quota_ctxt *qctxt,
 580                struct qunit_data *qdata, int opc, int wait)
 581 {
 582         struct lustre_qunit *qunit, *empty;
 583         struct qunit_waiter qw;
 584         struct l_wait_info lwi = { 0 };
 585         struct ptlrpc_request *req;
 586         struct qunit_data *reqdata;
 587         struct dqacq_async_args *aa;
 588         int size[2] = { sizeof(struct ptlrpc_body), sizeof(*reqdata) };
 589         int rc = 0;
 590         ENTRY;
 591
 592         INIT_LIST_HEAD(&qw.qw_entry);
 593         init_waitqueue_head(&qw.qw_waitq);
 594         qw.qw_rc = 0;
 595
 596         if ((empty = alloc_qunit(qctxt, qdata, opc)) == NULL)
 597                 RETURN(-ENOMEM);
 598
 599         spin_lock(&qunit_hash_lock);
 600
 601         qunit = dqacq_in_flight(qctxt, qdata);
 602         if (qunit) {
 603                 if (wait)
 604                         list_add_tail(&qw.qw_entry, &qunit->lq_waiters);
 605                 spin_unlock(&qunit_hash_lock);
 606
 607                 free_qunit(empty);
 608                 goto wait_completion;
 609         }
 610         qunit = empty;
 611         insert_qunit_nolock(qctxt, qunit);
 612         if (wait)
 613                 list_add_tail(&qw.qw_entry, &qunit->lq_waiters);
 614         spin_unlock(&qunit_hash_lock);
 615
 616         LASSERT(qunit);
 617
 618         /* master is going to dqacq/dqrel from itself */
 619         if (is_master(obd, qctxt, qdata->qd_id, qdata->qd_flags & QUOTA_IS_GRP)) {
 620                 int rc2;
 621                 QDATA_DEBUG(qdata, "local %s.\n",
 622                             opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 623                 rc = qctxt->lqc_handler(obd, qdata, opc);
 624                 rc2 = dqacq_completion(obd, qctxt, qdata, rc, opc);
 625                 RETURN((rc && rc != -EDQUOT) ? rc : rc2);
 626         }
 627
 628         /* build dqacq/dqrel request */
 629         LASSERT(qctxt->lqc_import);
 630         req = ptlrpc_prep_req(qctxt->lqc_import, LUSTRE_MDS_VERSION, opc, 2,
 631                               size, NULL);
 632         if (!req) {
 633                 dqacq_completion(obd, qctxt, qdata, -ENOMEM, opc);
 634                 RETURN(-ENOMEM);
 635         }
 636
 637         LASSERT(!should_translate_quota(qctxt->lqc_import) ||
 638                 qdata->qd_count <= MAX_QUOTA_COUNT32);
 639         if (should_translate_quota(qctxt->lqc_import))
 640         {
 641                 struct qunit_data_old *reqdata_old, *tmp;
 642
 643                 reqdata_old = lustre_msg_buf(req->rq_reqmsg, REPLY_REC_OFF,
 644                                              sizeof(*reqdata_old));
 645                 tmp = lustre_quota_new_to_old(qdata);
 646                 *reqdata_old = *tmp;
 647                 size[1] = sizeof(*reqdata_old);
 648                 CDEBUG(D_QUOTA, "qd_count is 32bit!\n");
 649         } else {
 650                 reqdata = lustre_msg_buf(req->rq_reqmsg, REPLY_REC_OFF,
 651                                          sizeof(*reqdata));
 652                 *reqdata = *qdata;
 653                 size[1] = sizeof(*reqdata);
 654                 CDEBUG(D_QUOTA, "qd_count is 64bit!\n");
 655         }
 656         ptlrpc_req_set_repsize(req, 2, size);
 657
 658         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
 659         aa = (struct dqacq_async_args *)&req->rq_async_args;
 660         aa->aa_ctxt = qctxt;
 661         aa->aa_qunit = qunit;
 662
 663         req->rq_interpret_reply = dqacq_interpret;
 664         ptlrpcd_add_req(req);
 665
 666         QDATA_DEBUG(qdata, "%s scheduled.\n",
 667                     opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 668 wait_completion:
 669         if (wait && qunit) {
 670                 struct qunit_data *p = &qunit->lq_data;
 671                 QDATA_DEBUG(p, "wait for dqacq.\n");
 672
 673                 l_wait_event(qw.qw_waitq, got_qunit(&qw), &lwi);
 674                 if (qw.qw_rc == 0)
 675                         rc = -EAGAIN;
 676
 677                 CDEBUG(D_QUOTA, "wait dqacq done. (rc:%d)\n", qw.qw_rc);
 678         }
 679         RETURN(rc);
 680 }
 681
 682 int
 683 qctxt_adjust_qunit(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 684                    uid_t uid, gid_t gid, __u32 isblk, int wait)
 685 {
 686         int ret, rc = 0, i = USRQUOTA;
 687         __u32 id[MAXQUOTAS] = { uid, gid };
 688         struct qunit_data qdata[MAXQUOTAS];
 689         ENTRY;
 690
 691         CLASSERT(MAXQUOTAS < 4);
 692         if (!sb_any_quota_enabled(qctxt->lqc_sb))
 693                 RETURN(0);
 694
 695         for (i = 0; i < MAXQUOTAS; i++) {
 696                 qdata[i].qd_id = id[i];
 697                 qdata[i].qd_flags = 0;
 698                 qdata[i].qd_flags |= i;
 699                 qdata[i].qd_flags |= isblk ? QUOTA_IS_BLOCK : 0;
 700                 qdata[i].qd_count = 0;
 701
 702                 ret = check_cur_qunit(obd, qctxt, &qdata[i]);
 703                 if (ret > 0) {
 704                         int opc;
 705                         /* need acquire or release */
 706                         opc = ret == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
 707                         ret = split_before_schedule_dqacq(obd, qctxt, &qdata[i],
 708                                                           opc, wait);
 709                         if (!rc)
 710                                 rc = ret;
 711                 }
 712         }
 713
 714         RETURN(rc);
 715 }
 716
 717 int
 718 qctxt_wait_pending_dqacq(struct lustre_quota_ctxt *qctxt, unsigned int id,
 719                          unsigned short type, int isblk)
 720 {
 721         struct lustre_qunit *qunit = NULL;
 722         struct qunit_waiter qw;
 723         struct qunit_data qdata;
 724         struct l_wait_info lwi = { 0 };
 725         ENTRY;
 726
 727         INIT_LIST_HEAD(&qw.qw_entry);
 728         init_waitqueue_head(&qw.qw_waitq);
 729         qw.qw_rc = 0;
 730
 731         qdata.qd_id = id;
 732         qdata.qd_flags = 0;
 733         qdata.qd_flags |= type;
 734         qdata.qd_flags |= isblk ? QUOTA_IS_BLOCK : 0;
 735         qdata.qd_count = 0;
 736
 737         spin_lock(&qunit_hash_lock);
 738
 739         qunit = dqacq_in_flight(qctxt, &qdata);
 740         if (qunit)
 741                 list_add_tail(&qw.qw_entry, &qunit->lq_waiters);
 742
 743         spin_unlock(&qunit_hash_lock);
 744
 745         if (qunit) {
 746                 struct qunit_data *p = &qdata;
 747                 QDATA_DEBUG(p, "wait for dqacq completion.\n");
 748                 l_wait_event(qw.qw_waitq, got_qunit(&qw), &lwi);
 749                 QDATA_DEBUG(p, "wait dqacq done. (rc:%d)\n", qw.qw_rc);
 750         }
 751         RETURN(0);
 752 }
 753
 754 int
 755 qctxt_init(struct lustre_quota_ctxt *qctxt, struct super_block *sb,
 756            dqacq_handler_t handler)
 757 {
 758         int rc = 0;
 759         ENTRY;
 760
 761         rc = ptlrpcd_addref();
 762         if (rc)
 763                 RETURN(rc);
 764
 765         qctxt->lqc_handler = handler;
 766         qctxt->lqc_sb = sb;
 767         qctxt->lqc_import = NULL;
 768         qctxt->lqc_recovery = 0;
 769         qctxt->lqc_atype = 0;
 770         qctxt->lqc_status= 0;
 771         qctxt->lqc_bunit_sz = default_bunit_sz;
 772         qctxt->lqc_btune_sz = default_bunit_sz / 100 * default_btune_ratio;
 773         qctxt->lqc_iunit_sz = default_iunit_sz;
 774         qctxt->lqc_itune_sz = default_iunit_sz * default_itune_ratio / 100;
 775
 776         RETURN(0);
 777 }
 778
 779 void qctxt_cleanup(struct lustre_quota_ctxt *qctxt, int force)
 780 {
 781         struct lustre_qunit *qunit, *tmp;
 782         struct qunit_waiter *qw, *tmp2;
 783         int i;
 784         ENTRY;
 785
 786         spin_lock(&qunit_hash_lock);
 787
 788         for (i = 0; i < NR_DQHASH; i++) {
 789                 list_for_each_entry_safe(qunit, tmp, &qunit_hash[i], lq_hash) {
 790                         if (qunit->lq_ctxt != qctxt)
 791                                 continue;
 792
 793                         remove_qunit_nolock(qunit);
 794                         /* wake up all waiters */
 795                         list_for_each_entry_safe(qw, tmp2, &qunit->lq_waiters,
 796                                                  qw_entry) {
 797                                 list_del_init(&qw->qw_entry);
 798                                 qw->qw_rc = 0;
 799                                 wake_up(&qw->qw_waitq);
 800                         }
 801                         qunit_put(qunit);
 802                 }
 803         }
 804
 805         spin_unlock(&qunit_hash_lock);
 806
 807         ptlrpcd_decref();
 808
 809         EXIT;
 810 }
 811
 812 struct qslave_recov_thread_data {
 813         struct obd_device *obd;
 814         struct lustre_quota_ctxt *qctxt;
 815         struct completion comp;
 816 };
 817
 818 /* FIXME only recovery block quota by now */
 819 static int qslave_recovery_main(void *arg)
 820 {
 821         struct qslave_recov_thread_data *data = arg;
 822         struct obd_device *obd = data->obd;
 823         struct lustre_quota_ctxt *qctxt = data->qctxt;
 824         unsigned int type;
 825         int rc = 0;
 826         ENTRY;
 827
 828         ptlrpc_daemonize("qslave_recovd");
 829
 830         complete(&data->comp);
 831
 832         if (qctxt->lqc_recovery)
 833                 RETURN(0);
 834         qctxt->lqc_recovery = 1;
 835
 836         for (type = USRQUOTA; type < MAXQUOTAS; type++) {
 837                 struct qunit_data qdata;
 838                 struct quota_info *dqopt = sb_dqopt(qctxt->lqc_sb);
 839                 struct list_head id_list;
 840                 struct dquot_id *dqid, *tmp;
 841                 int ret;
 842
 843                 LOCK_DQONOFF_MUTEX(dqopt);
 844                 if (!sb_has_quota_enabled(qctxt->lqc_sb, type)) {
 845                         UNLOCK_DQONOFF_MUTEX(dqopt);
 846                         break;
 847                 }
 848
 849                 LASSERT(dqopt->files[type] != NULL);
 850                 INIT_LIST_HEAD(&id_list);
 851 #ifndef KERNEL_SUPPORTS_QUOTA_READ
 852                 rc = fsfilt_qids(obd, dqopt->files[type], NULL, type, &id_list);
 853 #else
 854                 rc = fsfilt_qids(obd, NULL, dqopt->files[type], type, &id_list);
 855 #endif
 856                 UNLOCK_DQONOFF_MUTEX(dqopt);
 857                 if (rc)
 858                         CERROR("Get ids from quota file failed. (rc:%d)\n", rc);
 859
 860                 list_for_each_entry_safe(dqid, tmp, &id_list, di_link) {
 861                         list_del_init(&dqid->di_link);
 862                         /* skip slave recovery on itself */
 863                         if (is_master(obd, qctxt, dqid->di_id, type))
 864                                 goto free;
 865                         if (rc && rc != -EBUSY)
 866                                 goto free;
 867
 868                         qdata.qd_id = dqid->di_id;
 869                         qdata.qd_flags = 0;
 870                         qdata.qd_flags |= type;
 871                         qdata.qd_flags |= QUOTA_IS_BLOCK;
 872                         qdata.qd_count = 0;
 873
 874                         ret = check_cur_qunit(obd, qctxt, &qdata);
 875                         if (ret > 0) {
 876                                 int opc;
 877                                 opc = ret == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
 878                                 rc = split_before_schedule_dqacq(obd, qctxt, &qdata, opc, 0);
 879                         } else
 880                                 rc = 0;
 881
 882                         if (rc)
 883                                 CDEBUG(rc == -EBUSY ? D_QUOTA : D_ERROR,
 884                                        "qslave recovery failed! (id:%d type:%d "
 885                                        " rc:%d)\n", dqid->di_id, type, rc);
 886 free:
 887                         kfree(dqid);
 888                 }
 889         }
 890
 891         qctxt->lqc_recovery = 0;
 892         RETURN(rc);
 893 }
 894
 895 void
 896 qslave_start_recovery(struct obd_device *obd, struct lustre_quota_ctxt *qctxt)
 897 {
 898         struct qslave_recov_thread_data data;
 899         int rc;
 900         ENTRY;
 901
 902         if (!sb_any_quota_enabled(qctxt->lqc_sb))
 903                 goto exit;
 904
 905         data.obd = obd;
 906         data.qctxt = qctxt;
 907         init_completion(&data.comp);
 908
 909         rc = kernel_thread(qslave_recovery_main, &data, CLONE_VM|CLONE_FILES);
 910         if (rc < 0) {
 911                 CERROR("Cannot start quota recovery thread: rc %d\n", rc);
 912                 goto exit;
 913         }
 914         wait_for_completion(&data.comp);
 915 exit:
 916         EXIT;
 917 }
 918