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         OBD_ALLOC_PTR(qctl);
 214         if (qctl == NULL)
 215                 RETURN(-ENOMEM);
 216
 217         /* get fs quota usage & limit */
 218         qctl->qc_cmd = Q_GETQUOTA;
 219         qctl->qc_id = qdata->qd_id;
 220         qctl->qc_type = qdata_type;
 221         ret = fsfilt_quotactl(obd, sb, qctl);
 222         if (ret) {
 223                 if (ret == -ESRCH)      /* no limit */
 224                         ret = 0;
 225                 else
 226                         CERROR("can't get fs quota usage! (rc:%d)\n", ret);
 227                 GOTO(out, ret);
 228         }
 229
 230         if (is_blk) {
 231                 usage = qctl->qc_dqblk.dqb_curspace;
 232                 limit = qctl->qc_dqblk.dqb_bhardlimit << QUOTABLOCK_BITS;
 233                 qunit_sz = qctxt->lqc_bunit_sz;
 234                 tune_sz = qctxt->lqc_btune_sz;
 235
 236                 LASSERT(!(qunit_sz % QUOTABLOCK_SIZE));
 237         } else {
 238                 usage = qctl->qc_dqblk.dqb_curinodes;
 239                 limit = qctl->qc_dqblk.dqb_ihardlimit;
 240                 qunit_sz = qctxt->lqc_iunit_sz;
 241                 tune_sz = qctxt->lqc_itune_sz;
 242         }
 243
 244         /* ignore the no quota limit case */
 245         if (!limit)
 246                 GOTO(out, ret = 0);
 247
 248         /* we don't count the MIN_QLIMIT */
 249         if ((limit == MIN_QLIMIT && !is_blk) ||
 250             (toqb(limit) == MIN_QLIMIT && is_blk))
 251                 limit = 0;
 252
 253         LASSERT(qdata->qd_count == 0);
 254         if (limit <= usage + tune_sz) {
 255                 while (qdata->qd_count + limit <= usage + tune_sz)
 256                         qdata->qd_count += qunit_sz;
 257                 ret = 1;
 258         } else if (limit > usage + qunit_sz + tune_sz) {
 259                 while (limit - qdata->qd_count > usage + qunit_sz + tune_sz)
 260                         qdata->qd_count += qunit_sz;
 261                 ret = 2;
 262         }
 263         LASSERT(ret == 0 || qdata->qd_count);
 264         EXIT;
 265 out:
 266         OBD_FREE_PTR(qctl);
 267         return ret;
 268 }
 269
 270 /* caller must hold qunit_hash_lock */
 271 static struct lustre_qunit *dqacq_in_flight(struct lustre_quota_ctxt *qctxt,
 272                                             struct qunit_data *qdata)
 273 {
 274         unsigned int hashent = qunit_hashfn(qctxt, qdata);
 275         struct lustre_qunit *qunit;
 276         ENTRY;
 277
 278         LASSERT_SPIN_LOCKED(&qunit_hash_lock);
 279         qunit = find_qunit(hashent, qctxt, qdata);
 280         RETURN(qunit);
 281 }
 282
 283 static struct lustre_qunit *alloc_qunit(struct lustre_quota_ctxt *qctxt,
 284                                         struct qunit_data *qdata, int opc)
 285 {
 286         struct lustre_qunit *qunit = NULL;
 287         ENTRY;
 288
 289         OBD_SLAB_ALLOC(qunit, qunit_cachep, CFS_ALLOC_IO, sizeof(*qunit));
 290         if (qunit == NULL)
 291                 RETURN(NULL);
 292
 293         INIT_LIST_HEAD(&qunit->lq_hash);
 294         INIT_LIST_HEAD(&qunit->lq_waiters);
 295         atomic_set(&qunit->lq_refcnt, 1);
 296         qunit->lq_ctxt = qctxt;
 297         memcpy(&qunit->lq_data, qdata, sizeof(*qdata));
 298         qunit->lq_opc = opc;
 299
 300         RETURN(qunit);
 301 }
 302
 303 static inline void free_qunit(struct lustre_qunit *qunit)
 304 {
 305         OBD_SLAB_FREE(qunit, qunit_cachep, sizeof(*qunit));
 306 }
 307
 308 static inline void qunit_get(struct lustre_qunit *qunit)
 309 {
 310         atomic_inc(&qunit->lq_refcnt);
 311 }
 312
 313 static void qunit_put(struct lustre_qunit *qunit)
 314 {
 315         LASSERT(atomic_read(&qunit->lq_refcnt));
 316         if (atomic_dec_and_test(&qunit->lq_refcnt))
 317                 free_qunit(qunit);
 318 }
 319
 320 static void
 321 insert_qunit_nolock(struct lustre_quota_ctxt *qctxt, struct lustre_qunit *qunit)
 322 {
 323         struct list_head *head;
 324
 325         LASSERT(list_empty(&qunit->lq_hash));
 326         head = qunit_hash + qunit_hashfn(qctxt, &qunit->lq_data);
 327         list_add(&qunit->lq_hash, head);
 328 }
 329
 330 static void remove_qunit_nolock(struct lustre_qunit *qunit)
 331 {
 332         LASSERT(!list_empty(&qunit->lq_hash));
 333         list_del_init(&qunit->lq_hash);
 334 }
 335
 336 struct qunit_waiter {
 337         struct list_head qw_entry;
 338         cfs_waitq_t      qw_waitq;
 339         int qw_rc;
 340 };
 341
 342 #define INC_QLIMIT(limit, count) (limit == MIN_QLIMIT) ? \
 343                                  (limit = count) : (limit += count)
 344
 345
 346 /* FIXME check if this mds is the master of specified id */
 347 static int
 348 is_master(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 349           unsigned int id, int type)
 350 {
 351         return qctxt->lqc_handler ? 1 : 0;
 352 }
 353
 354 static int
 355 schedule_dqacq(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 356                struct qunit_data *qdata, int opc, int wait);
 357
 358 static int split_before_schedule_dqacq(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 359                                        struct qunit_data *qdata, int opc, int wait)
 360 {
 361         int rc = 0;
 362         unsigned long factor;
 363         struct qunit_data tmp_qdata;
 364         ENTRY;
 365
 366         LASSERT(qdata && qdata->qd_count);
 367         QDATA_DEBUG(qdata, "%s quota split.\n",
 368                     (qdata->qd_flags & QUOTA_IS_BLOCK) ? "block" : "inode");
 369         if (qdata->qd_flags & QUOTA_IS_BLOCK)
 370                 factor = MAX_QUOTA_COUNT32 / qctxt->lqc_bunit_sz *
 371                         qctxt->lqc_bunit_sz;
 372         else
 373                 factor = MAX_QUOTA_COUNT32 / qctxt->lqc_iunit_sz *
 374                         qctxt->lqc_iunit_sz;
 375
 376         if (qctxt->lqc_import && should_translate_quota(qctxt->lqc_import) &&
 377             qdata->qd_count > factor) {
 378                         tmp_qdata = *qdata;
 379                 tmp_qdata.qd_count = factor;
 380                         qdata->qd_count -= tmp_qdata.qd_count;
 381                 QDATA_DEBUG((&tmp_qdata), "be split.\n");
 382                 rc = schedule_dqacq(obd, qctxt, &tmp_qdata, opc, wait);
 383         } else{
 384                 QDATA_DEBUG(qdata, "don't be split.\n");
 385                 rc = schedule_dqacq(obd, qctxt, qdata, opc, wait);
 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         LASSERTF(!div_r, "qunit_sz: %lu, return qunit_sz: "LPU64"\n",
 411                  qunit_sz, qd_tmp);
 412
 413         /* update local operational quota file */
 414         if (rc == 0) {
 415                 __u32 count = QUSG(qdata->qd_count, is_blk);
 416                 struct obd_quotactl *qctl;
 417                 __u64 *hardlimit;
 418
 419                 OBD_ALLOC_PTR(qctl);
 420                 if (qctl == NULL)
 421                         GOTO(out, err = -ENOMEM);
 422
 423                 /* acq/rel qunit for specified uid/gid is serialized,
 424                  * so there is no race between get fs quota limit and
 425                  * set fs quota limit */
 426                 qctl->qc_cmd = Q_GETQUOTA;
 427                 qctl->qc_id = qdata->qd_id;
 428                 qctl->qc_type = qdata_type;
 429                 err = fsfilt_quotactl(obd, sb, qctl);
 430                 if (err) {
 431                         CERROR("error get quota fs limit! (rc:%d)\n", err);
 432                         GOTO(out_mem, err);
 433                 }
 434
 435                 if (is_blk) {
 436                         qctl->qc_dqblk.dqb_valid = QIF_BLIMITS;
 437                         hardlimit = &qctl->qc_dqblk.dqb_bhardlimit;
 438                 } else {
 439                         qctl->qc_dqblk.dqb_valid = QIF_ILIMITS;
 440                         hardlimit = &qctl->qc_dqblk.dqb_ihardlimit;
 441                 }
 442
 443                 switch (opc) {
 444                 case QUOTA_DQACQ:
 445                         CDEBUG(D_QUOTA, "%s(acq):count: %d, hardlimt: "LPU64
 446                                ",type: %s.\n", obd->obd_name, count, *hardlimit,
 447                                qdata_type ? "grp": "usr");
 448                         INC_QLIMIT(*hardlimit, count);
 449                         break;
 450                 case QUOTA_DQREL:
 451                         CDEBUG(D_QUOTA, "%s(rel):count: %d, hardlimt: "LPU64
 452                                ",type: %s.\n", obd->obd_name, count, *hardlimit,
 453                                qdata_type ? "grp": "usr");
 454                         LASSERTF(count < *hardlimit,
 455                                  "count: %d, hardlimit: "LPU64".\n",
 456                                  count, *hardlimit);
 457                         *hardlimit -= count;
 458                         break;
 459                 default:
 460                         LBUG();
 461                 }
 462
 463                 /* clear quota limit */
 464                 if (count == 0)
 465                         *hardlimit = 0;
 466
 467                 qctl->qc_cmd = Q_SETQUOTA;
 468                 err = fsfilt_quotactl(obd, sb, qctl);
 469                 if (err)
 470                         CERROR("error set quota fs limit! (rc:%d)\n", err);
 471
 472                 QDATA_DEBUG(qdata, "%s completion\n",
 473                             opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 474 out_mem:
 475                 OBD_FREE_PTR(qctl);
 476         } else if (rc == -EDQUOT) {
 477                 QDATA_DEBUG(qdata, "acquire qunit got EDQUOT.\n");
 478         } else if (rc == -EBUSY) {
 479                 QDATA_DEBUG(qdata, "it's is recovering, got EBUSY.\n");
 480         } else {
 481                 CERROR("acquire qunit got error! (rc:%d)\n", rc);
 482         }
 483 out:
 484         /* remove the qunit from hash */
 485         spin_lock(&qunit_hash_lock);
 486
 487         qunit = dqacq_in_flight(qctxt, qdata);
 488         /* this qunit has been removed by qctxt_cleanup() */
 489         if (!qunit) {
 490                 spin_unlock(&qunit_hash_lock);
 491                 RETURN(err);
 492         }
 493
 494         LASSERT(opc == qunit->lq_opc);
 495         remove_qunit_nolock(qunit);
 496
 497         /* wake up all waiters */
 498         list_for_each_entry_safe(qw, tmp, &qunit->lq_waiters, qw_entry) {
 499                 list_del_init(&qw->qw_entry);
 500                 qw->qw_rc = rc;
 501                 wake_up(&qw->qw_waitq);
 502         }
 503
 504         spin_unlock(&qunit_hash_lock);
 505
 506         qunit_put(qunit);
 507
 508         /* don't reschedule in such cases:
 509          *   - acq/rel failure, but not for quota recovery.
 510          *   - local dqacq/dqrel.
 511          *   - local disk io failure.
 512          */
 513         if (err || (rc && rc != -EBUSY) ||
 514             is_master(obd, qctxt, qdata->qd_id, qdata_type))
 515                 RETURN(err);
 516
 517         /* reschedule another dqacq/dqrel if needed */
 518         qdata->qd_count = 0;
 519         rc = check_cur_qunit(obd, qctxt, qdata);
 520         if (rc > 0) {
 521                 int opc;
 522                 opc = rc == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
 523                 rc = split_before_schedule_dqacq(obd, qctxt, qdata, opc, 0);
 524                 QDATA_DEBUG(qdata, "reschedudle opc(%d) rc(%d)\n", opc, rc);
 525         }
 526         RETURN(err);
 527 }
 528
 529 struct dqacq_async_args {
 530         struct lustre_quota_ctxt *aa_ctxt;
 531         struct lustre_qunit *aa_qunit;
 532 };
 533
 534 static int dqacq_interpret(struct ptlrpc_request *req, void *data, int rc)
 535 {
 536         struct dqacq_async_args *aa = (struct dqacq_async_args *)data;
 537         struct lustre_quota_ctxt *qctxt = aa->aa_ctxt;
 538         struct lustre_qunit *qunit = aa->aa_qunit;
 539         struct obd_device *obd = req->rq_import->imp_obd;
 540         struct qunit_data *qdata = NULL;
 541         struct qunit_data_old *qdata_old = NULL;
 542         ENTRY;
 543
 544         LASSERT(req);
 545         LASSERT(req->rq_import);
 546         if ((req->rq_import->imp_connect_data.ocd_connect_flags & OBD_CONNECT_QUOTA64)  &&
 547             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
 548                 CDEBUG(D_QUOTA, "qd_count is 64bit!\n");
 549                 qdata = lustre_swab_reqbuf(req, REPLY_REC_OFF, sizeof(*qdata), lustre_swab_qdata);
 550         } else {
 551                 CDEBUG(D_QUOTA, "qd_count is 32bit!\n");
 552                 qdata_old = lustre_swab_reqbuf(req, REPLY_REC_OFF, sizeof(struct qunit_data_old),
 553                                                lustre_swab_qdata_old);
 554                 qdata = lustre_quota_old_to_new(qdata_old);
 555         }
 556         if (qdata == NULL) {
 557                 DEBUG_REQ(D_ERROR, req, "error unpacking qunit_data");
 558                 RETURN(-EPROTO);
 559         }
 560
 561         LASSERT(qdata->qd_id == qunit->lq_data.qd_id &&
 562                 (qdata->qd_flags & QUOTA_IS_GRP) == (qunit->lq_data.qd_flags & QUOTA_IS_GRP) &&
 563                 (qdata->qd_count == qunit->lq_data.qd_count ||
 564                  qdata->qd_count == 0));
 565
 566         QDATA_DEBUG(qdata, "%s interpret rc(%d).\n",
 567                     lustre_msg_get_opc(req->rq_reqmsg) == QUOTA_DQACQ ?
 568                     "DQACQ" : "DQREL", rc);
 569
 570         rc = dqacq_completion(obd, qctxt, qdata, rc,
 571                               lustre_msg_get_opc(req->rq_reqmsg));
 572
 573         RETURN(rc);
 574 }
 575
 576 static int got_qunit(struct qunit_waiter *waiter)
 577 {
 578         int rc = 0;
 579         ENTRY;
 580         spin_lock(&qunit_hash_lock);
 581         rc = list_empty(&waiter->qw_entry);
 582         spin_unlock(&qunit_hash_lock);
 583         RETURN(rc);
 584 }
 585
 586 static int
 587 schedule_dqacq(struct obd_device *obd,
 588                struct lustre_quota_ctxt *qctxt,
 589                struct qunit_data *qdata, int opc, int wait)
 590 {
 591         struct lustre_qunit *qunit, *empty;
 592         struct qunit_waiter qw;
 593         struct l_wait_info lwi = { 0 };
 594         struct ptlrpc_request *req;
 595         struct qunit_data *reqdata;
 596         struct dqacq_async_args *aa;
 597         int size[2] = { sizeof(struct ptlrpc_body), sizeof(*reqdata) };
 598         unsigned long factor;
 599         int rc = 0;
 600         ENTRY;
 601
 602         INIT_LIST_HEAD(&qw.qw_entry);
 603         init_waitqueue_head(&qw.qw_waitq);
 604         qw.qw_rc = 0;
 605
 606         if ((empty = alloc_qunit(qctxt, qdata, opc)) == NULL)
 607                 RETURN(-ENOMEM);
 608
 609         spin_lock(&qunit_hash_lock);
 610
 611         qunit = dqacq_in_flight(qctxt, qdata);
 612         if (qunit) {
 613                 if (wait)
 614                         list_add_tail(&qw.qw_entry, &qunit->lq_waiters);
 615                 spin_unlock(&qunit_hash_lock);
 616
 617                 free_qunit(empty);
 618                 goto wait_completion;
 619         }
 620         qunit = empty;
 621         insert_qunit_nolock(qctxt, qunit);
 622         if (wait)
 623                 list_add_tail(&qw.qw_entry, &qunit->lq_waiters);
 624         spin_unlock(&qunit_hash_lock);
 625
 626         LASSERT(qunit);
 627
 628         /* master is going to dqacq/dqrel from itself */
 629         if (is_master(obd, qctxt, qdata->qd_id, qdata->qd_flags & QUOTA_IS_GRP)) {
 630                 int rc2;
 631                 QDATA_DEBUG(qdata, "local %s.\n",
 632                             opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 633                 rc = qctxt->lqc_handler(obd, qdata, opc);
 634                 rc2 = dqacq_completion(obd, qctxt, qdata, rc, opc);
 635                 RETURN((rc && rc != -EDQUOT) ? rc : rc2);
 636         }
 637
 638         /* build dqacq/dqrel request */
 639         LASSERT(qctxt->lqc_import);
 640         req = ptlrpc_prep_req(qctxt->lqc_import, LUSTRE_MDS_VERSION, opc, 2,
 641                               size, NULL);
 642         if (!req) {
 643                 dqacq_completion(obd, qctxt, qdata, -ENOMEM, opc);
 644                 RETURN(-ENOMEM);
 645         }
 646
 647         if (qdata->qd_flags & QUOTA_IS_BLOCK)
 648                 factor = MAX_QUOTA_COUNT32 / qctxt->lqc_bunit_sz *
 649                          qctxt->lqc_bunit_sz;
 650         else
 651                 factor = MAX_QUOTA_COUNT32 / qctxt->lqc_iunit_sz *
 652                          qctxt->lqc_iunit_sz;
 653
 654         LASSERT(!should_translate_quota(qctxt->lqc_import) ||
 655                 qdata->qd_count <= factor);
 656         if (should_translate_quota(qctxt->lqc_import))
 657         {
 658                 struct qunit_data_old *reqdata_old, *tmp;
 659
 660                 reqdata_old = lustre_msg_buf(req->rq_reqmsg, REPLY_REC_OFF,
 661                                              sizeof(*reqdata_old));
 662                 tmp = lustre_quota_new_to_old(qdata);
 663                 *reqdata_old = *tmp;
 664                 size[1] = sizeof(*reqdata_old);
 665                 CDEBUG(D_QUOTA, "qd_count is 32bit!\n");
 666         } else {
 667                 reqdata = lustre_msg_buf(req->rq_reqmsg, REPLY_REC_OFF,
 668                                          sizeof(*reqdata));
 669                 *reqdata = *qdata;
 670                 size[1] = sizeof(*reqdata);
 671                 CDEBUG(D_QUOTA, "qd_count is 64bit!\n");
 672         }
 673         ptlrpc_req_set_repsize(req, 2, size);
 674
 675         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
 676         aa = (struct dqacq_async_args *)&req->rq_async_args;
 677         aa->aa_ctxt = qctxt;
 678         aa->aa_qunit = qunit;
 679
 680         req->rq_interpret_reply = dqacq_interpret;
 681         ptlrpcd_add_req(req);
 682
 683         QDATA_DEBUG(qdata, "%s scheduled.\n",
 684                     opc == QUOTA_DQACQ ? "DQACQ" : "DQREL");
 685 wait_completion:
 686         if (wait && qunit) {
 687                 struct qunit_data *p = &qunit->lq_data;
 688                 QDATA_DEBUG(p, "wait for dqacq.\n");
 689
 690                 l_wait_event(qw.qw_waitq, got_qunit(&qw), &lwi);
 691                 if (qw.qw_rc == 0)
 692                         rc = -EAGAIN;
 693
 694                 CDEBUG(D_QUOTA, "wait dqacq done. (rc:%d)\n", qw.qw_rc);
 695         }
 696         RETURN(rc);
 697 }
 698
 699 int
 700 qctxt_adjust_qunit(struct obd_device *obd, struct lustre_quota_ctxt *qctxt,
 701                    uid_t uid, gid_t gid, __u32 isblk, int wait)
 702 {
 703         int ret, rc = 0, i = USRQUOTA;
 704         __u32 id[MAXQUOTAS] = { uid, gid };
 705         struct qunit_data qdata[MAXQUOTAS];
 706         ENTRY;
 707
 708         CLASSERT(MAXQUOTAS < 4);
 709         if (!sb_any_quota_enabled(qctxt->lqc_sb))
 710                 RETURN(0);
 711
 712         for (i = 0; i < MAXQUOTAS; i++) {
 713                 qdata[i].qd_id = id[i];
 714                 qdata[i].qd_flags = 0;
 715                 qdata[i].qd_flags |= i;
 716                 qdata[i].qd_flags |= isblk ? QUOTA_IS_BLOCK : 0;
 717                 qdata[i].qd_count = 0;
 718
 719                 ret = check_cur_qunit(obd, qctxt, &qdata[i]);
 720                 if (ret > 0) {
 721                         int opc;
 722                         /* need acquire or release */
 723                         opc = ret == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
 724                         ret = split_before_schedule_dqacq(obd, qctxt, &qdata[i],
 725                                                           opc, wait);
 726                         if (!rc)
 727                                 rc = ret;
 728                 }
 729         }
 730
 731         RETURN(rc);
 732 }
 733
 734 int
 735 qctxt_wait_pending_dqacq(struct lustre_quota_ctxt *qctxt, unsigned int id,
 736                          unsigned short type, int isblk)
 737 {
 738         struct lustre_qunit *qunit = NULL;
 739         struct qunit_waiter qw;
 740         struct qunit_data qdata;
 741         struct l_wait_info lwi = { 0 };
 742         ENTRY;
 743
 744         INIT_LIST_HEAD(&qw.qw_entry);
 745         init_waitqueue_head(&qw.qw_waitq);
 746         qw.qw_rc = 0;
 747
 748         qdata.qd_id = id;
 749         qdata.qd_flags = 0;
 750         qdata.qd_flags |= type;
 751         qdata.qd_flags |= isblk ? QUOTA_IS_BLOCK : 0;
 752         qdata.qd_count = 0;
 753
 754         spin_lock(&qunit_hash_lock);
 755
 756         qunit = dqacq_in_flight(qctxt, &qdata);
 757         if (qunit)
 758                 list_add_tail(&qw.qw_entry, &qunit->lq_waiters);
 759
 760         spin_unlock(&qunit_hash_lock);
 761
 762         if (qunit) {
 763                 struct qunit_data *p = &qdata;
 764                 QDATA_DEBUG(p, "wait for dqacq completion.\n");
 765                 l_wait_event(qw.qw_waitq, got_qunit(&qw), &lwi);
 766                 QDATA_DEBUG(p, "wait dqacq done. (rc:%d)\n", qw.qw_rc);
 767         }
 768         RETURN(0);
 769 }
 770
 771 int
 772 qctxt_init(struct lustre_quota_ctxt *qctxt, struct super_block *sb,
 773            dqacq_handler_t handler)
 774 {
 775         int rc = 0;
 776         ENTRY;
 777
 778         rc = ptlrpcd_addref();
 779         if (rc)
 780                 RETURN(rc);
 781
 782         qctxt->lqc_handler = handler;
 783         qctxt->lqc_sb = sb;
 784         qctxt->lqc_import = NULL;
 785         qctxt->lqc_recovery = 0;
 786         qctxt->lqc_atype = 0;
 787         qctxt->lqc_status= 0;
 788         qctxt->lqc_bunit_sz = default_bunit_sz;
 789         qctxt->lqc_btune_sz = default_bunit_sz / 100 * default_btune_ratio;
 790         qctxt->lqc_iunit_sz = default_iunit_sz;
 791         qctxt->lqc_itune_sz = default_iunit_sz * default_itune_ratio / 100;
 792
 793         RETURN(0);
 794 }
 795
 796 void qctxt_cleanup(struct lustre_quota_ctxt *qctxt, int force)
 797 {
 798         struct lustre_qunit *qunit, *tmp;
 799         struct qunit_waiter *qw, *tmp2;
 800         int i;
 801         ENTRY;
 802
 803         spin_lock(&qunit_hash_lock);
 804
 805         for (i = 0; i < NR_DQHASH; i++) {
 806                 list_for_each_entry_safe(qunit, tmp, &qunit_hash[i], lq_hash) {
 807                         if (qunit->lq_ctxt != qctxt)
 808                                 continue;
 809
 810                         remove_qunit_nolock(qunit);
 811                         /* wake up all waiters */
 812                         list_for_each_entry_safe(qw, tmp2, &qunit->lq_waiters,
 813                                                  qw_entry) {
 814                                 list_del_init(&qw->qw_entry);
 815                                 qw->qw_rc = 0;
 816                                 wake_up(&qw->qw_waitq);
 817                         }
 818                         qunit_put(qunit);
 819                 }
 820         }
 821
 822         spin_unlock(&qunit_hash_lock);
 823
 824         ptlrpcd_decref();
 825
 826         EXIT;
 827 }
 828
 829 struct qslave_recov_thread_data {
 830         struct obd_device *obd;
 831         struct lustre_quota_ctxt *qctxt;
 832         struct completion comp;
 833 };
 834
 835 /* FIXME only recovery block quota by now */
 836 static int qslave_recovery_main(void *arg)
 837 {
 838         struct qslave_recov_thread_data *data = arg;
 839         struct obd_device *obd = data->obd;
 840         struct lustre_quota_ctxt *qctxt = data->qctxt;
 841         unsigned int type;
 842         int rc = 0;
 843         ENTRY;
 844
 845         ptlrpc_daemonize("qslave_recovd");
 846
 847         complete(&data->comp);
 848
 849         if (qctxt->lqc_recovery)
 850                 RETURN(0);
 851         qctxt->lqc_recovery = 1;
 852
 853         for (type = USRQUOTA; type < MAXQUOTAS; type++) {
 854                 struct qunit_data qdata;
 855                 struct quota_info *dqopt = sb_dqopt(qctxt->lqc_sb);
 856                 struct list_head id_list;
 857                 struct dquot_id *dqid, *tmp;
 858                 int ret;
 859
 860                 LOCK_DQONOFF_MUTEX(dqopt);
 861                 if (!sb_has_quota_enabled(qctxt->lqc_sb, type)) {
 862                         UNLOCK_DQONOFF_MUTEX(dqopt);
 863                         break;
 864                 }
 865
 866                 LASSERT(dqopt->files[type] != NULL);
 867                 INIT_LIST_HEAD(&id_list);
 868 #ifndef KERNEL_SUPPORTS_QUOTA_READ
 869                 rc = fsfilt_qids(obd, dqopt->files[type], NULL, type, &id_list);
 870 #else
 871                 rc = fsfilt_qids(obd, NULL, dqopt->files[type], type, &id_list);
 872 #endif
 873                 UNLOCK_DQONOFF_MUTEX(dqopt);
 874                 if (rc)
 875                         CERROR("Get ids from quota file failed. (rc:%d)\n", rc);
 876
 877                 list_for_each_entry_safe(dqid, tmp, &id_list, di_link) {
 878                         list_del_init(&dqid->di_link);
 879                         /* skip slave recovery on itself */
 880                         if (is_master(obd, qctxt, dqid->di_id, type))
 881                                 goto free;
 882                         if (rc && rc != -EBUSY)
 883                                 goto free;
 884
 885                         qdata.qd_id = dqid->di_id;
 886                         qdata.qd_flags = 0;
 887                         qdata.qd_flags |= type;
 888                         qdata.qd_flags |= QUOTA_IS_BLOCK;
 889                         qdata.qd_count = 0;
 890
 891                         ret = check_cur_qunit(obd, qctxt, &qdata);
 892                         if (ret > 0) {
 893                                 int opc;
 894                                 opc = ret == 1 ? QUOTA_DQACQ : QUOTA_DQREL;
 895                                 rc = split_before_schedule_dqacq(obd, qctxt, &qdata, opc, 0);
 896                         } else
 897                                 rc = 0;
 898
 899                         if (rc)
 900                                 CDEBUG(rc == -EBUSY ? D_QUOTA : D_ERROR,
 901                                        "qslave recovery failed! (id:%d type:%d "
 902                                        " rc:%d)\n", dqid->di_id, type, rc);
 903 free:
 904                         kfree(dqid);
 905                 }
 906         }
 907
 908         qctxt->lqc_recovery = 0;
 909         RETURN(rc);
 910 }
 911
 912 void
 913 qslave_start_recovery(struct obd_device *obd, struct lustre_quota_ctxt *qctxt)
 914 {
 915         struct qslave_recov_thread_data data;
 916         int rc;
 917         ENTRY;
 918
 919         if (!sb_any_quota_enabled(qctxt->lqc_sb))
 920                 goto exit;
 921
 922         data.obd = obd;
 923         data.qctxt = qctxt;
 924         init_completion(&data.comp);
 925
 926         rc = kernel_thread(qslave_recovery_main, &data, CLONE_VM|CLONE_FILES);
 927         if (rc < 0) {
 928                 CERROR("Cannot start quota recovery thread: rc %d\n", rc);
 929                 goto exit;
 930         }
 931         wait_for_completion(&data.comp);
 932 exit:
 933         EXIT;
 934 }
 935