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