fs/xfs/xfs_qm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_bit.h"
  13 #include "xfs_sb.h"
  14 #include "xfs_mount.h"
  15 #include "xfs_inode.h"
  16 #include "xfs_iwalk.h"
  17 #include "xfs_quota.h"
  18 #include "xfs_bmap.h"
  19 #include "xfs_bmap_util.h"
  20 #include "xfs_trans.h"
  21 #include "xfs_trans_space.h"
  22 #include "xfs_qm.h"
  23 #include "xfs_trace.h"
  24 #include "xfs_icache.h"
  25 #include "xfs_error.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_ialloc.h"
  28 #include "xfs_log_priv.h"
  29
  30 /*
  31  * The global quota manager. There is only one of these for the entire
  32  * system, _not_ one per file system. XQM keeps track of the overall
  33  * quota functionality, including maintaining the freelist and hash
  34  * tables of dquots.
  35  */
  36 STATIC int      xfs_qm_init_quotainos(struct xfs_mount *mp);
  37 STATIC int      xfs_qm_init_quotainfo(struct xfs_mount *mp);
  38
  39 STATIC void     xfs_qm_destroy_quotainos(struct xfs_quotainfo *qi);
  40 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  41 /*
  42  * We use the batch lookup interface to iterate over the dquots as it
  43  * currently is the only interface into the radix tree code that allows
  44  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  45  * operations is fine as all callers are used either during mount/umount
  46  * or quotaoff.
  47  */
  48 #define XFS_DQ_LOOKUP_BATCH     32
  49
  50 STATIC int
  51 xfs_qm_dquot_walk(
  52         struct xfs_mount        *mp,
  53         xfs_dqtype_t            type,
  54         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  55         void                    *data)
  56 {
  57         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  58         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  59         uint32_t                next_index;
  60         int                     last_error = 0;
  61         int                     skipped;
  62         int                     nr_found;
  63
  64 restart:
  65         skipped = 0;
  66         next_index = 0;
  67         nr_found = 0;
  68
  69         while (1) {
  70                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  71                 int             error = 0;
  72                 int             i;
  73
  74                 mutex_lock(&qi->qi_tree_lock);
  75                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  76                                         next_index, XFS_DQ_LOOKUP_BATCH);
  77                 if (!nr_found) {
  78                         mutex_unlock(&qi->qi_tree_lock);
  79                         break;
  80                 }
  81
  82                 for (i = 0; i < nr_found; i++) {
  83                         struct xfs_dquot *dqp = batch[i];
  84
  85                         next_index = dqp->q_id + 1;
  86
  87                         error = execute(batch[i], data);
  88                         if (error == -EAGAIN) {
  89                                 skipped++;
  90                                 continue;
  91                         }
  92                         if (error && last_error != -EFSCORRUPTED)
  93                                 last_error = error;
  94                 }
  95
  96                 mutex_unlock(&qi->qi_tree_lock);
  97
  98                 /* bail out if the filesystem is corrupted.  */
  99                 if (last_error == -EFSCORRUPTED) {
 100                         skipped = 0;
 101                         break;
 102                 }
 103                 /* we're done if id overflows back to zero */
 104                 if (!next_index)
 105                         break;
 106         }
 107
 108         if (skipped) {
 109                 delay(1);
 110                 goto restart;
 111         }
 112
 113         return last_error;
 114 }
 115
 116
 117 /*
 118  * Purge a dquot from all tracking data structures and free it.
 119  */
 120 STATIC int
 121 xfs_qm_dqpurge(
 122         struct xfs_dquot        *dqp,
 123         void                    *data)
 124 {
 125         struct xfs_quotainfo    *qi = dqp->q_mount->m_quotainfo;
 126         int                     error = -EAGAIN;
 127
 128         xfs_dqlock(dqp);
 129         if ((dqp->q_flags & XFS_DQFLAG_FREEING) || dqp->q_nrefs != 0)
 130                 goto out_unlock;
 131
 132         dqp->q_flags |= XFS_DQFLAG_FREEING;
 133
 134         xfs_dqflock(dqp);
 135
 136         /*
 137          * If we are turning this type of quotas off, we don't care
 138          * about the dirty metadata sitting in this dquot. OTOH, if
 139          * we're unmounting, we do care, so we flush it and wait.
 140          */
 141         if (XFS_DQ_IS_DIRTY(dqp)) {
 142                 struct xfs_buf  *bp = NULL;
 143
 144                 /*
 145                  * We don't care about getting disk errors here. We need
 146                  * to purge this dquot anyway, so we go ahead regardless.
 147                  */
 148                 error = xfs_qm_dqflush(dqp, &bp);
 149                 if (!error) {
 150                         error = xfs_bwrite(bp);
 151                         xfs_buf_relse(bp);
 152                 } else if (error == -EAGAIN) {
 153                         dqp->q_flags &= ~XFS_DQFLAG_FREEING;
 154                         goto out_unlock;
 155                 }
 156                 xfs_dqflock(dqp);
 157         }
 158
 159         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 160         ASSERT(xlog_is_shutdown(dqp->q_logitem.qli_item.li_log) ||
 161                 !test_bit(XFS_LI_IN_AIL, &dqp->q_logitem.qli_item.li_flags));
 162
 163         xfs_dqfunlock(dqp);
 164         xfs_dqunlock(dqp);
 165
 166         radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
 167         qi->qi_dquots--;
 168
 169         /*
 170          * We move dquots to the freelist as soon as their reference count
 171          * hits zero, so it really should be on the freelist here.
 172          */
 173         ASSERT(!list_empty(&dqp->q_lru));
 174         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 175         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 176
 177         xfs_qm_dqdestroy(dqp);
 178         return 0;
 179
 180 out_unlock:
 181         xfs_dqunlock(dqp);
 182         return error;
 183 }
 184
 185 /*
 186  * Purge the dquot cache.
 187  */
 188 static void
 189 xfs_qm_dqpurge_all(
 190         struct xfs_mount        *mp)
 191 {
 192         xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_dqpurge, NULL);
 193         xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_dqpurge, NULL);
 194         xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_dqpurge, NULL);
 195 }
 196
 197 /*
 198  * Just destroy the quotainfo structure.
 199  */
 200 void
 201 xfs_qm_unmount(
 202         struct xfs_mount        *mp)
 203 {
 204         if (mp->m_quotainfo) {
 205                 xfs_qm_dqpurge_all(mp);
 206                 xfs_qm_destroy_quotainfo(mp);
 207         }
 208 }
 209
 210 /*
 211  * Called from the vfsops layer.
 212  */
 213 void
 214 xfs_qm_unmount_quotas(
 215         xfs_mount_t     *mp)
 216 {
 217         /*
 218          * Release the dquots that root inode, et al might be holding,
 219          * before we flush quotas and blow away the quotainfo structure.
 220          */
 221         ASSERT(mp->m_rootip);
 222         xfs_qm_dqdetach(mp->m_rootip);
 223         if (mp->m_rbmip)
 224                 xfs_qm_dqdetach(mp->m_rbmip);
 225         if (mp->m_rsumip)
 226                 xfs_qm_dqdetach(mp->m_rsumip);
 227
 228         /*
 229          * Release the quota inodes.
 230          */
 231         if (mp->m_quotainfo) {
 232                 if (mp->m_quotainfo->qi_uquotaip) {
 233                         xfs_irele(mp->m_quotainfo->qi_uquotaip);
 234                         mp->m_quotainfo->qi_uquotaip = NULL;
 235                 }
 236                 if (mp->m_quotainfo->qi_gquotaip) {
 237                         xfs_irele(mp->m_quotainfo->qi_gquotaip);
 238                         mp->m_quotainfo->qi_gquotaip = NULL;
 239                 }
 240                 if (mp->m_quotainfo->qi_pquotaip) {
 241                         xfs_irele(mp->m_quotainfo->qi_pquotaip);
 242                         mp->m_quotainfo->qi_pquotaip = NULL;
 243                 }
 244         }
 245 }
 246
 247 STATIC int
 248 xfs_qm_dqattach_one(
 249         struct xfs_inode        *ip,
 250         xfs_dqtype_t            type,
 251         bool                    doalloc,
 252         struct xfs_dquot        **IO_idqpp)
 253 {
 254         struct xfs_dquot        *dqp;
 255         int                     error;
 256
 257         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 258         error = 0;
 259
 260         /*
 261          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 262          * or &i_gdquot. This made the code look weird, but made the logic a lot
 263          * simpler.
 264          */
 265         dqp = *IO_idqpp;
 266         if (dqp) {
 267                 trace_xfs_dqattach_found(dqp);
 268                 return 0;
 269         }
 270
 271         /*
 272          * Find the dquot from somewhere. This bumps the reference count of
 273          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 274          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 275          * turned off suddenly.
 276          */
 277         error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
 278         if (error)
 279                 return error;
 280
 281         trace_xfs_dqattach_get(dqp);
 282
 283         /*
 284          * dqget may have dropped and re-acquired the ilock, but it guarantees
 285          * that the dquot returned is the one that should go in the inode.
 286          */
 287         *IO_idqpp = dqp;
 288         xfs_dqunlock(dqp);
 289         return 0;
 290 }
 291
 292 static bool
 293 xfs_qm_need_dqattach(
 294         struct xfs_inode        *ip)
 295 {
 296         struct xfs_mount        *mp = ip->i_mount;
 297
 298         if (!XFS_IS_QUOTA_ON(mp))
 299                 return false;
 300         if (!XFS_NOT_DQATTACHED(mp, ip))
 301                 return false;
 302         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 303                 return false;
 304         return true;
 305 }
 306
 307 /*
 308  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 309  * into account.
 310  * If @doalloc is true, the dquot(s) will be allocated if needed.
 311  * Inode may get unlocked and relocked in here, and the caller must deal with
 312  * the consequences.
 313  */
 314 int
 315 xfs_qm_dqattach_locked(
 316         xfs_inode_t     *ip,
 317         bool            doalloc)
 318 {
 319         xfs_mount_t     *mp = ip->i_mount;
 320         int             error = 0;
 321
 322         if (!xfs_qm_need_dqattach(ip))
 323                 return 0;
 324
 325         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 326
 327         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 328                 error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_USER,
 329                                 doalloc, &ip->i_udquot);
 330                 if (error)
 331                         goto done;
 332                 ASSERT(ip->i_udquot);
 333         }
 334
 335         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 336                 error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_GROUP,
 337                                 doalloc, &ip->i_gdquot);
 338                 if (error)
 339                         goto done;
 340                 ASSERT(ip->i_gdquot);
 341         }
 342
 343         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 344                 error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_PROJ,
 345                                 doalloc, &ip->i_pdquot);
 346                 if (error)
 347                         goto done;
 348                 ASSERT(ip->i_pdquot);
 349         }
 350
 351 done:
 352         /*
 353          * Don't worry about the dquots that we may have attached before any
 354          * error - they'll get detached later if it has not already been done.
 355          */
 356         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 357         return error;
 358 }
 359
 360 int
 361 xfs_qm_dqattach(
 362         struct xfs_inode        *ip)
 363 {
 364         int                     error;
 365
 366         if (!xfs_qm_need_dqattach(ip))
 367                 return 0;
 368
 369         xfs_ilock(ip, XFS_ILOCK_EXCL);
 370         error = xfs_qm_dqattach_locked(ip, false);
 371         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 372
 373         return error;
 374 }
 375
 376 /*
 377  * Release dquots (and their references) if any.
 378  * The inode should be locked EXCL except when this's called by
 379  * xfs_ireclaim.
 380  */
 381 void
 382 xfs_qm_dqdetach(
 383         xfs_inode_t     *ip)
 384 {
 385         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 386                 return;
 387
 388         trace_xfs_dquot_dqdetach(ip);
 389
 390         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 391         if (ip->i_udquot) {
 392                 xfs_qm_dqrele(ip->i_udquot);
 393                 ip->i_udquot = NULL;
 394         }
 395         if (ip->i_gdquot) {
 396                 xfs_qm_dqrele(ip->i_gdquot);
 397                 ip->i_gdquot = NULL;
 398         }
 399         if (ip->i_pdquot) {
 400                 xfs_qm_dqrele(ip->i_pdquot);
 401                 ip->i_pdquot = NULL;
 402         }
 403 }
 404
 405 struct xfs_qm_isolate {
 406         struct list_head        buffers;
 407         struct list_head        dispose;
 408 };
 409
 410 static enum lru_status
 411 xfs_qm_dquot_isolate(
 412         struct list_head        *item,
 413         struct list_lru_one     *lru,
 414         spinlock_t              *lru_lock,
 415         void                    *arg)
 416                 __releases(lru_lock) __acquires(lru_lock)
 417 {
 418         struct xfs_dquot        *dqp = container_of(item,
 419                                                 struct xfs_dquot, q_lru);
 420         struct xfs_qm_isolate   *isol = arg;
 421
 422         if (!xfs_dqlock_nowait(dqp))
 423                 goto out_miss_busy;
 424
 425         /*
 426          * This dquot has acquired a reference in the meantime remove it from
 427          * the freelist and try again.
 428          */
 429         if (dqp->q_nrefs) {
 430                 xfs_dqunlock(dqp);
 431                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 432
 433                 trace_xfs_dqreclaim_want(dqp);
 434                 list_lru_isolate(lru, &dqp->q_lru);
 435                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 436                 return LRU_REMOVED;
 437         }
 438
 439         /*
 440          * If the dquot is dirty, flush it. If it's already being flushed, just
 441          * skip it so there is time for the IO to complete before we try to
 442          * reclaim it again on the next LRU pass.
 443          */
 444         if (!xfs_dqflock_nowait(dqp)) {
 445                 xfs_dqunlock(dqp);
 446                 goto out_miss_busy;
 447         }
 448
 449         if (XFS_DQ_IS_DIRTY(dqp)) {
 450                 struct xfs_buf  *bp = NULL;
 451                 int             error;
 452
 453                 trace_xfs_dqreclaim_dirty(dqp);
 454
 455                 /* we have to drop the LRU lock to flush the dquot */
 456                 spin_unlock(lru_lock);
 457
 458                 error = xfs_qm_dqflush(dqp, &bp);
 459                 if (error)
 460                         goto out_unlock_dirty;
 461
 462                 xfs_buf_delwri_queue(bp, &isol->buffers);
 463                 xfs_buf_relse(bp);
 464                 goto out_unlock_dirty;
 465         }
 466         xfs_dqfunlock(dqp);
 467
 468         /*
 469          * Prevent lookups now that we are past the point of no return.
 470          */
 471         dqp->q_flags |= XFS_DQFLAG_FREEING;
 472         xfs_dqunlock(dqp);
 473
 474         ASSERT(dqp->q_nrefs == 0);
 475         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 476         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 477         trace_xfs_dqreclaim_done(dqp);
 478         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 479         return LRU_REMOVED;
 480
 481 out_miss_busy:
 482         trace_xfs_dqreclaim_busy(dqp);
 483         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 484         return LRU_SKIP;
 485
 486 out_unlock_dirty:
 487         trace_xfs_dqreclaim_busy(dqp);
 488         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 489         xfs_dqunlock(dqp);
 490         spin_lock(lru_lock);
 491         return LRU_RETRY;
 492 }
 493
 494 static unsigned long
 495 xfs_qm_shrink_scan(
 496         struct shrinker         *shrink,
 497         struct shrink_control   *sc)
 498 {
 499         struct xfs_quotainfo    *qi = container_of(shrink,
 500                                         struct xfs_quotainfo, qi_shrinker);
 501         struct xfs_qm_isolate   isol;
 502         unsigned long           freed;
 503         int                     error;
 504
 505         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 506                 return 0;
 507
 508         INIT_LIST_HEAD(&isol.buffers);
 509         INIT_LIST_HEAD(&isol.dispose);
 510
 511         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 512                                      xfs_qm_dquot_isolate, &isol);
 513
 514         error = xfs_buf_delwri_submit(&isol.buffers);
 515         if (error)
 516                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 517
 518         while (!list_empty(&isol.dispose)) {
 519                 struct xfs_dquot        *dqp;
 520
 521                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 522                 list_del_init(&dqp->q_lru);
 523                 xfs_qm_dqfree_one(dqp);
 524         }
 525
 526         return freed;
 527 }
 528
 529 static unsigned long
 530 xfs_qm_shrink_count(
 531         struct shrinker         *shrink,
 532         struct shrink_control   *sc)
 533 {
 534         struct xfs_quotainfo    *qi = container_of(shrink,
 535                                         struct xfs_quotainfo, qi_shrinker);
 536
 537         return list_lru_shrink_count(&qi->qi_lru, sc);
 538 }
 539
 540 STATIC void
 541 xfs_qm_set_defquota(
 542         struct xfs_mount        *mp,
 543         xfs_dqtype_t            type,
 544         struct xfs_quotainfo    *qinf)
 545 {
 546         struct xfs_dquot        *dqp;
 547         struct xfs_def_quota    *defq;
 548         int                     error;
 549
 550         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 551         if (error)
 552                 return;
 553
 554         defq = xfs_get_defquota(qinf, xfs_dquot_type(dqp));
 555
 556         /*
 557          * Timers and warnings have been already set, let's just set the
 558          * default limits for this quota type
 559          */
 560         defq->blk.hard = dqp->q_blk.hardlimit;
 561         defq->blk.soft = dqp->q_blk.softlimit;
 562         defq->ino.hard = dqp->q_ino.hardlimit;
 563         defq->ino.soft = dqp->q_ino.softlimit;
 564         defq->rtb.hard = dqp->q_rtb.hardlimit;
 565         defq->rtb.soft = dqp->q_rtb.softlimit;
 566         xfs_qm_dqdestroy(dqp);
 567 }
 568
 569 /* Initialize quota time limits from the root dquot. */
 570 static void
 571 xfs_qm_init_timelimits(
 572         struct xfs_mount        *mp,
 573         xfs_dqtype_t            type)
 574 {
 575         struct xfs_quotainfo    *qinf = mp->m_quotainfo;
 576         struct xfs_def_quota    *defq;
 577         struct xfs_dquot        *dqp;
 578         int                     error;
 579
 580         defq = xfs_get_defquota(qinf, type);
 581
 582         defq->blk.time = XFS_QM_BTIMELIMIT;
 583         defq->ino.time = XFS_QM_ITIMELIMIT;
 584         defq->rtb.time = XFS_QM_RTBTIMELIMIT;
 585
 586         /*
 587          * We try to get the limits from the superuser's limits fields.
 588          * This is quite hacky, but it is standard quota practice.
 589          *
 590          * Since we may not have done a quotacheck by this point, just read
 591          * the dquot without attaching it to any hashtables or lists.
 592          */
 593         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 594         if (error)
 595                 return;
 596
 597         /*
 598          * The warnings and timers set the grace period given to
 599          * a user or group before he or she can not perform any
 600          * more writing. If it is zero, a default is used.
 601          */
 602         if (dqp->q_blk.timer)
 603                 defq->blk.time = dqp->q_blk.timer;
 604         if (dqp->q_ino.timer)
 605                 defq->ino.time = dqp->q_ino.timer;
 606         if (dqp->q_rtb.timer)
 607                 defq->rtb.time = dqp->q_rtb.timer;
 608
 609         xfs_qm_dqdestroy(dqp);
 610 }
 611
 612 /*
 613  * This initializes all the quota information that's kept in the
 614  * mount structure
 615  */
 616 STATIC int
 617 xfs_qm_init_quotainfo(
 618         struct xfs_mount        *mp)
 619 {
 620         struct xfs_quotainfo    *qinf;
 621         int                     error;
 622
 623         ASSERT(XFS_IS_QUOTA_ON(mp));
 624
 625         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
 626
 627         error = list_lru_init(&qinf->qi_lru);
 628         if (error)
 629                 goto out_free_qinf;
 630
 631         /*
 632          * See if quotainodes are setup, and if not, allocate them,
 633          * and change the superblock accordingly.
 634          */
 635         error = xfs_qm_init_quotainos(mp);
 636         if (error)
 637                 goto out_free_lru;
 638
 639         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 640         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 641         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 642         mutex_init(&qinf->qi_tree_lock);
 643
 644         /* mutex used to serialize quotaoffs */
 645         mutex_init(&qinf->qi_quotaofflock);
 646
 647         /* Precalc some constants */
 648         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 649         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 650         if (xfs_has_bigtime(mp)) {
 651                 qinf->qi_expiry_min =
 652                         xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MIN);
 653                 qinf->qi_expiry_max =
 654                         xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MAX);
 655         } else {
 656                 qinf->qi_expiry_min = XFS_DQ_LEGACY_EXPIRY_MIN;
 657                 qinf->qi_expiry_max = XFS_DQ_LEGACY_EXPIRY_MAX;
 658         }
 659         trace_xfs_quota_expiry_range(mp, qinf->qi_expiry_min,
 660                         qinf->qi_expiry_max);
 661
 662         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 663
 664         xfs_qm_init_timelimits(mp, XFS_DQTYPE_USER);
 665         xfs_qm_init_timelimits(mp, XFS_DQTYPE_GROUP);
 666         xfs_qm_init_timelimits(mp, XFS_DQTYPE_PROJ);
 667
 668         if (XFS_IS_UQUOTA_ON(mp))
 669                 xfs_qm_set_defquota(mp, XFS_DQTYPE_USER, qinf);
 670         if (XFS_IS_GQUOTA_ON(mp))
 671                 xfs_qm_set_defquota(mp, XFS_DQTYPE_GROUP, qinf);
 672         if (XFS_IS_PQUOTA_ON(mp))
 673                 xfs_qm_set_defquota(mp, XFS_DQTYPE_PROJ, qinf);
 674
 675         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 676         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 677         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 678         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 679
 680         error = register_shrinker(&qinf->qi_shrinker, "xfs-qm:%s",
 681                                   mp->m_super->s_id);
 682         if (error)
 683                 goto out_free_inos;
 684
 685         return 0;
 686
 687 out_free_inos:
 688         mutex_destroy(&qinf->qi_quotaofflock);
 689         mutex_destroy(&qinf->qi_tree_lock);
 690         xfs_qm_destroy_quotainos(qinf);
 691 out_free_lru:
 692         list_lru_destroy(&qinf->qi_lru);
 693 out_free_qinf:
 694         kmem_free(qinf);
 695         mp->m_quotainfo = NULL;
 696         return error;
 697 }
 698
 699 /*
 700  * Gets called when unmounting a filesystem or when all quotas get
 701  * turned off.
 702  * This purges the quota inodes, destroys locks and frees itself.
 703  */
 704 void
 705 xfs_qm_destroy_quotainfo(
 706         struct xfs_mount        *mp)
 707 {
 708         struct xfs_quotainfo    *qi;
 709
 710         qi = mp->m_quotainfo;
 711         ASSERT(qi != NULL);
 712
 713         unregister_shrinker(&qi->qi_shrinker);
 714         list_lru_destroy(&qi->qi_lru);
 715         xfs_qm_destroy_quotainos(qi);
 716         mutex_destroy(&qi->qi_tree_lock);
 717         mutex_destroy(&qi->qi_quotaofflock);
 718         kmem_free(qi);
 719         mp->m_quotainfo = NULL;
 720 }
 721
 722 /*
 723  * Create an inode and return with a reference already taken, but unlocked
 724  * This is how we create quota inodes
 725  */
 726 STATIC int
 727 xfs_qm_qino_alloc(
 728         struct xfs_mount        *mp,
 729         struct xfs_inode        **ipp,
 730         unsigned int            flags)
 731 {
 732         struct xfs_trans        *tp;
 733         int                     error;
 734         bool                    need_alloc = true;
 735
 736         *ipp = NULL;
 737         /*
 738          * With superblock that doesn't have separate pquotino, we
 739          * share an inode between gquota and pquota. If the on-disk
 740          * superblock has GQUOTA and the filesystem is now mounted
 741          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 742          * vice-versa.
 743          */
 744         if (!xfs_has_pquotino(mp) &&
 745                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 746                 xfs_ino_t ino = NULLFSINO;
 747
 748                 if ((flags & XFS_QMOPT_PQUOTA) &&
 749                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 750                         ino = mp->m_sb.sb_gquotino;
 751                         if (XFS_IS_CORRUPT(mp,
 752                                            mp->m_sb.sb_pquotino != NULLFSINO))
 753                                 return -EFSCORRUPTED;
 754                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 755                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 756                         ino = mp->m_sb.sb_pquotino;
 757                         if (XFS_IS_CORRUPT(mp,
 758                                            mp->m_sb.sb_gquotino != NULLFSINO))
 759                                 return -EFSCORRUPTED;
 760                 }
 761                 if (ino != NULLFSINO) {
 762                         error = xfs_iget(mp, NULL, ino, 0, 0, ipp);
 763                         if (error)
 764                                 return error;
 765                         mp->m_sb.sb_gquotino = NULLFSINO;
 766                         mp->m_sb.sb_pquotino = NULLFSINO;
 767                         need_alloc = false;
 768                 }
 769         }
 770
 771         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 772                         need_alloc ? XFS_QM_QINOCREATE_SPACE_RES(mp) : 0,
 773                         0, 0, &tp);
 774         if (error)
 775                 return error;
 776
 777         if (need_alloc) {
 778                 xfs_ino_t       ino;
 779
 780                 error = xfs_dialloc(&tp, 0, S_IFREG, &ino);
 781                 if (!error)
 782                         error = xfs_init_new_inode(&init_user_ns, tp, NULL, ino,
 783                                         S_IFREG, 1, 0, 0, false, ipp);
 784                 if (error) {
 785                         xfs_trans_cancel(tp);
 786                         return error;
 787                 }
 788         }
 789
 790         /*
 791          * Make the changes in the superblock, and log those too.
 792          * sbfields arg may contain fields other than *QUOTINO;
 793          * VERSIONNUM for example.
 794          */
 795         spin_lock(&mp->m_sb_lock);
 796         if (flags & XFS_QMOPT_SBVERSION) {
 797                 ASSERT(!xfs_has_quota(mp));
 798
 799                 xfs_add_quota(mp);
 800                 mp->m_sb.sb_uquotino = NULLFSINO;
 801                 mp->m_sb.sb_gquotino = NULLFSINO;
 802                 mp->m_sb.sb_pquotino = NULLFSINO;
 803
 804                 /* qflags will get updated fully _after_ quotacheck */
 805                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 806         }
 807         if (flags & XFS_QMOPT_UQUOTA)
 808                 mp->m_sb.sb_uquotino = (*ipp)->i_ino;
 809         else if (flags & XFS_QMOPT_GQUOTA)
 810                 mp->m_sb.sb_gquotino = (*ipp)->i_ino;
 811         else
 812                 mp->m_sb.sb_pquotino = (*ipp)->i_ino;
 813         spin_unlock(&mp->m_sb_lock);
 814         xfs_log_sb(tp);
 815
 816         error = xfs_trans_commit(tp);
 817         if (error) {
 818                 ASSERT(xfs_is_shutdown(mp));
 819                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 820         }
 821         if (need_alloc)
 822                 xfs_finish_inode_setup(*ipp);
 823         return error;
 824 }
 825
 826
 827 STATIC void
 828 xfs_qm_reset_dqcounts(
 829         struct xfs_mount        *mp,
 830         struct xfs_buf          *bp,
 831         xfs_dqid_t              id,
 832         xfs_dqtype_t            type)
 833 {
 834         struct xfs_dqblk        *dqb;
 835         int                     j;
 836
 837         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 838
 839         /*
 840          * Reset all counters and timers. They'll be
 841          * started afresh by xfs_qm_quotacheck.
 842          */
 843 #ifdef DEBUG
 844         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 845                 sizeof(struct xfs_dqblk);
 846         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 847 #endif
 848         dqb = bp->b_addr;
 849         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 850                 struct xfs_disk_dquot   *ddq;
 851
 852                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 853
 854                 /*
 855                  * Do a sanity check, and if needed, repair the dqblk. Don't
 856                  * output any warnings because it's perfectly possible to
 857                  * find uninitialised dquot blks. See comment in
 858                  * xfs_dquot_verify.
 859                  */
 860                 if (xfs_dqblk_verify(mp, &dqb[j], id + j) ||
 861                     (dqb[j].dd_diskdq.d_type & XFS_DQTYPE_REC_MASK) != type)
 862                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 863
 864                 /*
 865                  * Reset type in case we are reusing group quota file for
 866                  * project quotas or vice versa
 867                  */
 868                 ddq->d_type = type;
 869                 ddq->d_bcount = 0;
 870                 ddq->d_icount = 0;
 871                 ddq->d_rtbcount = 0;
 872
 873                 /*
 874                  * dquot id 0 stores the default grace period and the maximum
 875                  * warning limit that were set by the administrator, so we
 876                  * should not reset them.
 877                  */
 878                 if (ddq->d_id != 0) {
 879                         ddq->d_btimer = 0;
 880                         ddq->d_itimer = 0;
 881                         ddq->d_rtbtimer = 0;
 882                         ddq->d_bwarns = 0;
 883                         ddq->d_iwarns = 0;
 884                         ddq->d_rtbwarns = 0;
 885                         if (xfs_has_bigtime(mp))
 886                                 ddq->d_type |= XFS_DQTYPE_BIGTIME;
 887                 }
 888
 889                 if (xfs_has_crc(mp)) {
 890                         xfs_update_cksum((char *)&dqb[j],
 891                                          sizeof(struct xfs_dqblk),
 892                                          XFS_DQUOT_CRC_OFF);
 893                 }
 894         }
 895 }
 896
 897 STATIC int
 898 xfs_qm_reset_dqcounts_all(
 899         struct xfs_mount        *mp,
 900         xfs_dqid_t              firstid,
 901         xfs_fsblock_t           bno,
 902         xfs_filblks_t           blkcnt,
 903         xfs_dqtype_t            type,
 904         struct list_head        *buffer_list)
 905 {
 906         struct xfs_buf          *bp;
 907         int                     error = 0;
 908
 909         ASSERT(blkcnt > 0);
 910
 911         /*
 912          * Blkcnt arg can be a very big number, and might even be
 913          * larger than the log itself. So, we have to break it up into
 914          * manageable-sized transactions.
 915          * Note that we don't start a permanent transaction here; we might
 916          * not be able to get a log reservation for the whole thing up front,
 917          * and we don't really care to either, because we just discard
 918          * everything if we were to crash in the middle of this loop.
 919          */
 920         while (blkcnt--) {
 921                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 922                               XFS_FSB_TO_DADDR(mp, bno),
 923                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 924                               &xfs_dquot_buf_ops);
 925
 926                 /*
 927                  * CRC and validation errors will return a EFSCORRUPTED here. If
 928                  * this occurs, re-read without CRC validation so that we can
 929                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 930                  * will leave a trace in the log indicating corruption has
 931                  * been detected.
 932                  */
 933                 if (error == -EFSCORRUPTED) {
 934                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 935                                       XFS_FSB_TO_DADDR(mp, bno),
 936                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 937                                       NULL);
 938                 }
 939
 940                 if (error)
 941                         break;
 942
 943                 /*
 944                  * A corrupt buffer might not have a verifier attached, so
 945                  * make sure we have the correct one attached before writeback
 946                  * occurs.
 947                  */
 948                 bp->b_ops = &xfs_dquot_buf_ops;
 949                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 950                 xfs_buf_delwri_queue(bp, buffer_list);
 951                 xfs_buf_relse(bp);
 952
 953                 /* goto the next block. */
 954                 bno++;
 955                 firstid += mp->m_quotainfo->qi_dqperchunk;
 956         }
 957
 958         return error;
 959 }
 960
 961 /*
 962  * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 963  * counters for every chunk of dquots that we find.
 964  */
 965 STATIC int
 966 xfs_qm_reset_dqcounts_buf(
 967         struct xfs_mount        *mp,
 968         struct xfs_inode        *qip,
 969         xfs_dqtype_t            type,
 970         struct list_head        *buffer_list)
 971 {
 972         struct xfs_bmbt_irec    *map;
 973         int                     i, nmaps;       /* number of map entries */
 974         int                     error;          /* return value */
 975         xfs_fileoff_t           lblkno;
 976         xfs_filblks_t           maxlblkcnt;
 977         xfs_dqid_t              firstid;
 978         xfs_fsblock_t           rablkno;
 979         xfs_filblks_t           rablkcnt;
 980
 981         error = 0;
 982         /*
 983          * This looks racy, but we can't keep an inode lock across a
 984          * trans_reserve. But, this gets called during quotacheck, and that
 985          * happens only at mount time which is single threaded.
 986          */
 987         if (qip->i_nblocks == 0)
 988                 return 0;
 989
 990         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
 991
 992         lblkno = 0;
 993         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 994         do {
 995                 uint            lock_mode;
 996
 997                 nmaps = XFS_DQITER_MAP_SIZE;
 998                 /*
 999                  * We aren't changing the inode itself. Just changing
1000                  * some of its data. No new blocks are added here, and
1001                  * the inode is never added to the transaction.
1002                  */
1003                 lock_mode = xfs_ilock_data_map_shared(qip);
1004                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1005                                        map, &nmaps, 0);
1006                 xfs_iunlock(qip, lock_mode);
1007                 if (error)
1008                         break;
1009
1010                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1011                 for (i = 0; i < nmaps; i++) {
1012                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1013                         ASSERT(map[i].br_blockcount);
1014
1015
1016                         lblkno += map[i].br_blockcount;
1017
1018                         if (map[i].br_startblock == HOLESTARTBLOCK)
1019                                 continue;
1020
1021                         firstid = (xfs_dqid_t) map[i].br_startoff *
1022                                 mp->m_quotainfo->qi_dqperchunk;
1023                         /*
1024                          * Do a read-ahead on the next extent.
1025                          */
1026                         if ((i+1 < nmaps) &&
1027                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1028                                 rablkcnt =  map[i+1].br_blockcount;
1029                                 rablkno = map[i+1].br_startblock;
1030                                 while (rablkcnt--) {
1031                                         xfs_buf_readahead(mp->m_ddev_targp,
1032                                                XFS_FSB_TO_DADDR(mp, rablkno),
1033                                                mp->m_quotainfo->qi_dqchunklen,
1034                                                &xfs_dquot_buf_ops);
1035                                         rablkno++;
1036                                 }
1037                         }
1038                         /*
1039                          * Iterate thru all the blks in the extent and
1040                          * reset the counters of all the dquots inside them.
1041                          */
1042                         error = xfs_qm_reset_dqcounts_all(mp, firstid,
1043                                                    map[i].br_startblock,
1044                                                    map[i].br_blockcount,
1045                                                    type, buffer_list);
1046                         if (error)
1047                                 goto out;
1048                 }
1049         } while (nmaps > 0);
1050
1051 out:
1052         kmem_free(map);
1053         return error;
1054 }
1055
1056 /*
1057  * Called by dqusage_adjust in doing a quotacheck.
1058  *
1059  * Given the inode, and a dquot id this updates both the incore dqout as well
1060  * as the buffer copy. This is so that once the quotacheck is done, we can
1061  * just log all the buffers, as opposed to logging numerous updates to
1062  * individual dquots.
1063  */
1064 STATIC int
1065 xfs_qm_quotacheck_dqadjust(
1066         struct xfs_inode        *ip,
1067         xfs_dqtype_t            type,
1068         xfs_qcnt_t              nblks,
1069         xfs_qcnt_t              rtblks)
1070 {
1071         struct xfs_mount        *mp = ip->i_mount;
1072         struct xfs_dquot        *dqp;
1073         xfs_dqid_t              id;
1074         int                     error;
1075
1076         id = xfs_qm_id_for_quotatype(ip, type);
1077         error = xfs_qm_dqget(mp, id, type, true, &dqp);
1078         if (error) {
1079                 /*
1080                  * Shouldn't be able to turn off quotas here.
1081                  */
1082                 ASSERT(error != -ESRCH);
1083                 ASSERT(error != -ENOENT);
1084                 return error;
1085         }
1086
1087         trace_xfs_dqadjust(dqp);
1088
1089         /*
1090          * Adjust the inode count and the block count to reflect this inode's
1091          * resource usage.
1092          */
1093         dqp->q_ino.count++;
1094         dqp->q_ino.reserved++;
1095         if (nblks) {
1096                 dqp->q_blk.count += nblks;
1097                 dqp->q_blk.reserved += nblks;
1098         }
1099         if (rtblks) {
1100                 dqp->q_rtb.count += rtblks;
1101                 dqp->q_rtb.reserved += rtblks;
1102         }
1103
1104         /*
1105          * Set default limits, adjust timers (since we changed usages)
1106          *
1107          * There are no timers for the default values set in the root dquot.
1108          */
1109         if (dqp->q_id) {
1110                 xfs_qm_adjust_dqlimits(dqp);
1111                 xfs_qm_adjust_dqtimers(dqp);
1112         }
1113
1114         dqp->q_flags |= XFS_DQFLAG_DIRTY;
1115         xfs_qm_dqput(dqp);
1116         return 0;
1117 }
1118
1119 /*
1120  * callback routine supplied to bulkstat(). Given an inumber, find its
1121  * dquots and update them to account for resources taken by that inode.
1122  */
1123 /* ARGSUSED */
1124 STATIC int
1125 xfs_qm_dqusage_adjust(
1126         struct xfs_mount        *mp,
1127         struct xfs_trans        *tp,
1128         xfs_ino_t               ino,
1129         void                    *data)
1130 {
1131         struct xfs_inode        *ip;
1132         xfs_qcnt_t              nblks;
1133         xfs_filblks_t           rtblks = 0;     /* total rt blks */
1134         int                     error;
1135
1136         ASSERT(XFS_IS_QUOTA_ON(mp));
1137
1138         /*
1139          * rootino must have its resources accounted for, not so with the quota
1140          * inodes.
1141          */
1142         if (xfs_is_quota_inode(&mp->m_sb, ino))
1143                 return 0;
1144
1145         /*
1146          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1147          * at mount time and therefore nobody will be racing chown/chproj.
1148          */
1149         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1150         if (error == -EINVAL || error == -ENOENT)
1151                 return 0;
1152         if (error)
1153                 return error;
1154
1155         ASSERT(ip->i_delayed_blks == 0);
1156
1157         if (XFS_IS_REALTIME_INODE(ip)) {
1158                 struct xfs_ifork        *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
1159
1160                 error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1161                 if (error)
1162                         goto error0;
1163
1164                 xfs_bmap_count_leaves(ifp, &rtblks);
1165         }
1166
1167         nblks = (xfs_qcnt_t)ip->i_nblocks - rtblks;
1168
1169         /*
1170          * Add the (disk blocks and inode) resources occupied by this
1171          * inode to its dquots. We do this adjustment in the incore dquot,
1172          * and also copy the changes to its buffer.
1173          * We don't care about putting these changes in a transaction
1174          * envelope because if we crash in the middle of a 'quotacheck'
1175          * we have to start from the beginning anyway.
1176          * Once we're done, we'll log all the dquot bufs.
1177          *
1178          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1179          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1180          */
1181         if (XFS_IS_UQUOTA_ON(mp)) {
1182                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_USER, nblks,
1183                                 rtblks);
1184                 if (error)
1185                         goto error0;
1186         }
1187
1188         if (XFS_IS_GQUOTA_ON(mp)) {
1189                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_GROUP, nblks,
1190                                 rtblks);
1191                 if (error)
1192                         goto error0;
1193         }
1194
1195         if (XFS_IS_PQUOTA_ON(mp)) {
1196                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_PROJ, nblks,
1197                                 rtblks);
1198                 if (error)
1199                         goto error0;
1200         }
1201
1202 error0:
1203         xfs_irele(ip);
1204         return error;
1205 }
1206
1207 STATIC int
1208 xfs_qm_flush_one(
1209         struct xfs_dquot        *dqp,
1210         void                    *data)
1211 {
1212         struct xfs_mount        *mp = dqp->q_mount;
1213         struct list_head        *buffer_list = data;
1214         struct xfs_buf          *bp = NULL;
1215         int                     error = 0;
1216
1217         xfs_dqlock(dqp);
1218         if (dqp->q_flags & XFS_DQFLAG_FREEING)
1219                 goto out_unlock;
1220         if (!XFS_DQ_IS_DIRTY(dqp))
1221                 goto out_unlock;
1222
1223         /*
1224          * The only way the dquot is already flush locked by the time quotacheck
1225          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1226          * it for the final time. Quotacheck collects all dquot bufs in the
1227          * local delwri queue before dquots are dirtied, so reclaim can't have
1228          * possibly queued it for I/O. The only way out is to push the buffer to
1229          * cycle the flush lock.
1230          */
1231         if (!xfs_dqflock_nowait(dqp)) {
1232                 /* buf is pinned in-core by delwri list */
1233                 error = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1234                                 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1235                 if (error)
1236                         goto out_unlock;
1237
1238                 if (!(bp->b_flags & _XBF_DELWRI_Q)) {
1239                         error = -EAGAIN;
1240                         xfs_buf_relse(bp);
1241                         goto out_unlock;
1242                 }
1243                 xfs_buf_unlock(bp);
1244
1245                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1246                 xfs_buf_rele(bp);
1247
1248                 error = -EAGAIN;
1249                 goto out_unlock;
1250         }
1251
1252         error = xfs_qm_dqflush(dqp, &bp);
1253         if (error)
1254                 goto out_unlock;
1255
1256         xfs_buf_delwri_queue(bp, buffer_list);
1257         xfs_buf_relse(bp);
1258 out_unlock:
1259         xfs_dqunlock(dqp);
1260         return error;
1261 }
1262
1263 /*
1264  * Walk thru all the filesystem inodes and construct a consistent view
1265  * of the disk quota world. If the quotacheck fails, disable quotas.
1266  */
1267 STATIC int
1268 xfs_qm_quotacheck(
1269         xfs_mount_t     *mp)
1270 {
1271         int                     error, error2;
1272         uint                    flags;
1273         LIST_HEAD               (buffer_list);
1274         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1275         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1276         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1277
1278         flags = 0;
1279
1280         ASSERT(uip || gip || pip);
1281         ASSERT(XFS_IS_QUOTA_ON(mp));
1282
1283         xfs_notice(mp, "Quotacheck needed: Please wait.");
1284
1285         /*
1286          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1287          * their counters to zero. We need a clean slate.
1288          * We don't log our changes till later.
1289          */
1290         if (uip) {
1291                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_DQTYPE_USER,
1292                                          &buffer_list);
1293                 if (error)
1294                         goto error_return;
1295                 flags |= XFS_UQUOTA_CHKD;
1296         }
1297
1298         if (gip) {
1299                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_DQTYPE_GROUP,
1300                                          &buffer_list);
1301                 if (error)
1302                         goto error_return;
1303                 flags |= XFS_GQUOTA_CHKD;
1304         }
1305
1306         if (pip) {
1307                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_DQTYPE_PROJ,
1308                                          &buffer_list);
1309                 if (error)
1310                         goto error_return;
1311                 flags |= XFS_PQUOTA_CHKD;
1312         }
1313
1314         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1315                         NULL);
1316         if (error) {
1317                 /*
1318                  * The inode walk may have partially populated the dquot
1319                  * caches.  We must purge them before disabling quota and
1320                  * tearing down the quotainfo, or else the dquots will leak.
1321                  */
1322                 xfs_qm_dqpurge_all(mp);
1323                 goto error_return;
1324         }
1325
1326         /*
1327          * We've made all the changes that we need to make incore.  Flush them
1328          * down to disk buffers if everything was updated successfully.
1329          */
1330         if (XFS_IS_UQUOTA_ON(mp)) {
1331                 error = xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_flush_one,
1332                                           &buffer_list);
1333         }
1334         if (XFS_IS_GQUOTA_ON(mp)) {
1335                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_flush_one,
1336                                            &buffer_list);
1337                 if (!error)
1338                         error = error2;
1339         }
1340         if (XFS_IS_PQUOTA_ON(mp)) {
1341                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_flush_one,
1342                                            &buffer_list);
1343                 if (!error)
1344                         error = error2;
1345         }
1346
1347         error2 = xfs_buf_delwri_submit(&buffer_list);
1348         if (!error)
1349                 error = error2;
1350
1351         /*
1352          * We can get this error if we couldn't do a dquot allocation inside
1353          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1354          * dirty dquots that might be cached, we just want to get rid of them
1355          * and turn quotaoff. The dquots won't be attached to any of the inodes
1356          * at this point (because we intentionally didn't in dqget_noattach).
1357          */
1358         if (error) {
1359                 xfs_qm_dqpurge_all(mp);
1360                 goto error_return;
1361         }
1362
1363         /*
1364          * If one type of quotas is off, then it will lose its
1365          * quotachecked status, since we won't be doing accounting for
1366          * that type anymore.
1367          */
1368         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1369         mp->m_qflags |= flags;
1370
1371  error_return:
1372         xfs_buf_delwri_cancel(&buffer_list);
1373
1374         if (error) {
1375                 xfs_warn(mp,
1376         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1377                         error);
1378                 /*
1379                  * We must turn off quotas.
1380                  */
1381                 ASSERT(mp->m_quotainfo != NULL);
1382                 xfs_qm_destroy_quotainfo(mp);
1383                 if (xfs_mount_reset_sbqflags(mp)) {
1384                         xfs_warn(mp,
1385                                 "Quotacheck: Failed to reset quota flags.");
1386                 }
1387         } else
1388                 xfs_notice(mp, "Quotacheck: Done.");
1389         return error;
1390 }
1391
1392 /*
1393  * This is called from xfs_mountfs to start quotas and initialize all
1394  * necessary data structures like quotainfo.  This is also responsible for
1395  * running a quotacheck as necessary.  We are guaranteed that the superblock
1396  * is consistently read in at this point.
1397  *
1398  * If we fail here, the mount will continue with quota turned off. We don't
1399  * need to inidicate success or failure at all.
1400  */
1401 void
1402 xfs_qm_mount_quotas(
1403         struct xfs_mount        *mp)
1404 {
1405         int                     error = 0;
1406         uint                    sbf;
1407
1408         /*
1409          * If quotas on realtime volumes is not supported, we disable
1410          * quotas immediately.
1411          */
1412         if (mp->m_sb.sb_rextents) {
1413                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1414                 mp->m_qflags = 0;
1415                 goto write_changes;
1416         }
1417
1418         ASSERT(XFS_IS_QUOTA_ON(mp));
1419
1420         /*
1421          * Allocate the quotainfo structure inside the mount struct, and
1422          * create quotainode(s), and change/rev superblock if necessary.
1423          */
1424         error = xfs_qm_init_quotainfo(mp);
1425         if (error) {
1426                 /*
1427                  * We must turn off quotas.
1428                  */
1429                 ASSERT(mp->m_quotainfo == NULL);
1430                 mp->m_qflags = 0;
1431                 goto write_changes;
1432         }
1433         /*
1434          * If any of the quotas are not consistent, do a quotacheck.
1435          */
1436         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1437                 error = xfs_qm_quotacheck(mp);
1438                 if (error) {
1439                         /* Quotacheck failed and disabled quotas. */
1440                         return;
1441                 }
1442         }
1443         /*
1444          * If one type of quotas is off, then it will lose its
1445          * quotachecked status, since we won't be doing accounting for
1446          * that type anymore.
1447          */
1448         if (!XFS_IS_UQUOTA_ON(mp))
1449                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1450         if (!XFS_IS_GQUOTA_ON(mp))
1451                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1452         if (!XFS_IS_PQUOTA_ON(mp))
1453                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1454
1455  write_changes:
1456         /*
1457          * We actually don't have to acquire the m_sb_lock at all.
1458          * This can only be called from mount, and that's single threaded. XXX
1459          */
1460         spin_lock(&mp->m_sb_lock);
1461         sbf = mp->m_sb.sb_qflags;
1462         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1463         spin_unlock(&mp->m_sb_lock);
1464
1465         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1466                 if (xfs_sync_sb(mp, false)) {
1467                         /*
1468                          * We could only have been turning quotas off.
1469                          * We aren't in very good shape actually because
1470                          * the incore structures are convinced that quotas are
1471                          * off, but the on disk superblock doesn't know that !
1472                          */
1473                         ASSERT(!(XFS_IS_QUOTA_ON(mp)));
1474                         xfs_alert(mp, "%s: Superblock update failed!",
1475                                 __func__);
1476                 }
1477         }
1478
1479         if (error) {
1480                 xfs_warn(mp, "Failed to initialize disk quotas.");
1481                 return;
1482         }
1483 }
1484
1485 /*
1486  * This is called after the superblock has been read in and we're ready to
1487  * iget the quota inodes.
1488  */
1489 STATIC int
1490 xfs_qm_init_quotainos(
1491         xfs_mount_t     *mp)
1492 {
1493         struct xfs_inode        *uip = NULL;
1494         struct xfs_inode        *gip = NULL;
1495         struct xfs_inode        *pip = NULL;
1496         int                     error;
1497         uint                    flags = 0;
1498
1499         ASSERT(mp->m_quotainfo);
1500
1501         /*
1502          * Get the uquota and gquota inodes
1503          */
1504         if (xfs_has_quota(mp)) {
1505                 if (XFS_IS_UQUOTA_ON(mp) &&
1506                     mp->m_sb.sb_uquotino != NULLFSINO) {
1507                         ASSERT(mp->m_sb.sb_uquotino > 0);
1508                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1509                                              0, 0, &uip);
1510                         if (error)
1511                                 return error;
1512                 }
1513                 if (XFS_IS_GQUOTA_ON(mp) &&
1514                     mp->m_sb.sb_gquotino != NULLFSINO) {
1515                         ASSERT(mp->m_sb.sb_gquotino > 0);
1516                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1517                                              0, 0, &gip);
1518                         if (error)
1519                                 goto error_rele;
1520                 }
1521                 if (XFS_IS_PQUOTA_ON(mp) &&
1522                     mp->m_sb.sb_pquotino != NULLFSINO) {
1523                         ASSERT(mp->m_sb.sb_pquotino > 0);
1524                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1525                                              0, 0, &pip);
1526                         if (error)
1527                                 goto error_rele;
1528                 }
1529         } else {
1530                 flags |= XFS_QMOPT_SBVERSION;
1531         }
1532
1533         /*
1534          * Create the three inodes, if they don't exist already. The changes
1535          * made above will get added to a transaction and logged in one of
1536          * the qino_alloc calls below.  If the device is readonly,
1537          * temporarily switch to read-write to do this.
1538          */
1539         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1540                 error = xfs_qm_qino_alloc(mp, &uip,
1541                                               flags | XFS_QMOPT_UQUOTA);
1542                 if (error)
1543                         goto error_rele;
1544
1545                 flags &= ~XFS_QMOPT_SBVERSION;
1546         }
1547         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1548                 error = xfs_qm_qino_alloc(mp, &gip,
1549                                           flags | XFS_QMOPT_GQUOTA);
1550                 if (error)
1551                         goto error_rele;
1552
1553                 flags &= ~XFS_QMOPT_SBVERSION;
1554         }
1555         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1556                 error = xfs_qm_qino_alloc(mp, &pip,
1557                                           flags | XFS_QMOPT_PQUOTA);
1558                 if (error)
1559                         goto error_rele;
1560         }
1561
1562         mp->m_quotainfo->qi_uquotaip = uip;
1563         mp->m_quotainfo->qi_gquotaip = gip;
1564         mp->m_quotainfo->qi_pquotaip = pip;
1565
1566         return 0;
1567
1568 error_rele:
1569         if (uip)
1570                 xfs_irele(uip);
1571         if (gip)
1572                 xfs_irele(gip);
1573         if (pip)
1574                 xfs_irele(pip);
1575         return error;
1576 }
1577
1578 STATIC void
1579 xfs_qm_destroy_quotainos(
1580         struct xfs_quotainfo    *qi)
1581 {
1582         if (qi->qi_uquotaip) {
1583                 xfs_irele(qi->qi_uquotaip);
1584                 qi->qi_uquotaip = NULL; /* paranoia */
1585         }
1586         if (qi->qi_gquotaip) {
1587                 xfs_irele(qi->qi_gquotaip);
1588                 qi->qi_gquotaip = NULL;
1589         }
1590         if (qi->qi_pquotaip) {
1591                 xfs_irele(qi->qi_pquotaip);
1592                 qi->qi_pquotaip = NULL;
1593         }
1594 }
1595
1596 STATIC void
1597 xfs_qm_dqfree_one(
1598         struct xfs_dquot        *dqp)
1599 {
1600         struct xfs_mount        *mp = dqp->q_mount;
1601         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1602
1603         mutex_lock(&qi->qi_tree_lock);
1604         radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
1605
1606         qi->qi_dquots--;
1607         mutex_unlock(&qi->qi_tree_lock);
1608
1609         xfs_qm_dqdestroy(dqp);
1610 }
1611
1612 /* --------------- utility functions for vnodeops ---------------- */
1613
1614
1615 /*
1616  * Given an inode, a uid, gid and prid make sure that we have
1617  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1618  * quotas by creating this file.
1619  * This also attaches dquot(s) to the given inode after locking it,
1620  * and returns the dquots corresponding to the uid and/or gid.
1621  *
1622  * in   : inode (unlocked)
1623  * out  : udquot, gdquot with references taken and unlocked
1624  */
1625 int
1626 xfs_qm_vop_dqalloc(
1627         struct xfs_inode        *ip,
1628         kuid_t                  uid,
1629         kgid_t                  gid,
1630         prid_t                  prid,
1631         uint                    flags,
1632         struct xfs_dquot        **O_udqpp,
1633         struct xfs_dquot        **O_gdqpp,
1634         struct xfs_dquot        **O_pdqpp)
1635 {
1636         struct xfs_mount        *mp = ip->i_mount;
1637         struct inode            *inode = VFS_I(ip);
1638         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1639         struct xfs_dquot        *uq = NULL;
1640         struct xfs_dquot        *gq = NULL;
1641         struct xfs_dquot        *pq = NULL;
1642         int                     error;
1643         uint                    lockflags;
1644
1645         if (!XFS_IS_QUOTA_ON(mp))
1646                 return 0;
1647
1648         lockflags = XFS_ILOCK_EXCL;
1649         xfs_ilock(ip, lockflags);
1650
1651         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1652                 gid = inode->i_gid;
1653
1654         /*
1655          * Attach the dquot(s) to this inode, doing a dquot allocation
1656          * if necessary. The dquot(s) will not be locked.
1657          */
1658         if (XFS_NOT_DQATTACHED(mp, ip)) {
1659                 error = xfs_qm_dqattach_locked(ip, true);
1660                 if (error) {
1661                         xfs_iunlock(ip, lockflags);
1662                         return error;
1663                 }
1664         }
1665
1666         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1667                 ASSERT(O_udqpp);
1668                 if (!uid_eq(inode->i_uid, uid)) {
1669                         /*
1670                          * What we need is the dquot that has this uid, and
1671                          * if we send the inode to dqget, the uid of the inode
1672                          * takes priority over what's sent in the uid argument.
1673                          * We must unlock inode here before calling dqget if
1674                          * we're not sending the inode, because otherwise
1675                          * we'll deadlock by doing trans_reserve while
1676                          * holding ilock.
1677                          */
1678                         xfs_iunlock(ip, lockflags);
1679                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1680                                         XFS_DQTYPE_USER, true, &uq);
1681                         if (error) {
1682                                 ASSERT(error != -ENOENT);
1683                                 return error;
1684                         }
1685                         /*
1686                          * Get the ilock in the right order.
1687                          */
1688                         xfs_dqunlock(uq);
1689                         lockflags = XFS_ILOCK_SHARED;
1690                         xfs_ilock(ip, lockflags);
1691                 } else {
1692                         /*
1693                          * Take an extra reference, because we'll return
1694                          * this to caller
1695                          */
1696                         ASSERT(ip->i_udquot);
1697                         uq = xfs_qm_dqhold(ip->i_udquot);
1698                 }
1699         }
1700         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1701                 ASSERT(O_gdqpp);
1702                 if (!gid_eq(inode->i_gid, gid)) {
1703                         xfs_iunlock(ip, lockflags);
1704                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1705                                         XFS_DQTYPE_GROUP, true, &gq);
1706                         if (error) {
1707                                 ASSERT(error != -ENOENT);
1708                                 goto error_rele;
1709                         }
1710                         xfs_dqunlock(gq);
1711                         lockflags = XFS_ILOCK_SHARED;
1712                         xfs_ilock(ip, lockflags);
1713                 } else {
1714                         ASSERT(ip->i_gdquot);
1715                         gq = xfs_qm_dqhold(ip->i_gdquot);
1716                 }
1717         }
1718         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1719                 ASSERT(O_pdqpp);
1720                 if (ip->i_projid != prid) {
1721                         xfs_iunlock(ip, lockflags);
1722                         error = xfs_qm_dqget(mp, prid,
1723                                         XFS_DQTYPE_PROJ, true, &pq);
1724                         if (error) {
1725                                 ASSERT(error != -ENOENT);
1726                                 goto error_rele;
1727                         }
1728                         xfs_dqunlock(pq);
1729                         lockflags = XFS_ILOCK_SHARED;
1730                         xfs_ilock(ip, lockflags);
1731                 } else {
1732                         ASSERT(ip->i_pdquot);
1733                         pq = xfs_qm_dqhold(ip->i_pdquot);
1734                 }
1735         }
1736         trace_xfs_dquot_dqalloc(ip);
1737
1738         xfs_iunlock(ip, lockflags);
1739         if (O_udqpp)
1740                 *O_udqpp = uq;
1741         else
1742                 xfs_qm_dqrele(uq);
1743         if (O_gdqpp)
1744                 *O_gdqpp = gq;
1745         else
1746                 xfs_qm_dqrele(gq);
1747         if (O_pdqpp)
1748                 *O_pdqpp = pq;
1749         else
1750                 xfs_qm_dqrele(pq);
1751         return 0;
1752
1753 error_rele:
1754         xfs_qm_dqrele(gq);
1755         xfs_qm_dqrele(uq);
1756         return error;
1757 }
1758
1759 /*
1760  * Actually transfer ownership, and do dquot modifications.
1761  * These were already reserved.
1762  */
1763 struct xfs_dquot *
1764 xfs_qm_vop_chown(
1765         struct xfs_trans        *tp,
1766         struct xfs_inode        *ip,
1767         struct xfs_dquot        **IO_olddq,
1768         struct xfs_dquot        *newdq)
1769 {
1770         struct xfs_dquot        *prevdq;
1771         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1772                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1773
1774
1775         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1776         ASSERT(XFS_IS_QUOTA_ON(ip->i_mount));
1777
1778         /* old dquot */
1779         prevdq = *IO_olddq;
1780         ASSERT(prevdq);
1781         ASSERT(prevdq != newdq);
1782
1783         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_nblocks));
1784         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1785
1786         /* the sparkling new dquot */
1787         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_nblocks);
1788         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1789
1790         /*
1791          * Back when we made quota reservations for the chown, we reserved the
1792          * ondisk blocks + delalloc blocks with the new dquot.  Now that we've
1793          * switched the dquots, decrease the new dquot's block reservation
1794          * (having already bumped up the real counter) so that we don't have
1795          * any reservation to give back when we commit.
1796          */
1797         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_RES_BLKS,
1798                         -ip->i_delayed_blks);
1799
1800         /*
1801          * Give the incore reservation for delalloc blocks back to the old
1802          * dquot.  We don't normally handle delalloc quota reservations
1803          * transactionally, so just lock the dquot and subtract from the
1804          * reservation.  Dirty the transaction because it's too late to turn
1805          * back now.
1806          */
1807         tp->t_flags |= XFS_TRANS_DIRTY;
1808         xfs_dqlock(prevdq);
1809         ASSERT(prevdq->q_blk.reserved >= ip->i_delayed_blks);
1810         prevdq->q_blk.reserved -= ip->i_delayed_blks;
1811         xfs_dqunlock(prevdq);
1812
1813         /*
1814          * Take an extra reference, because the inode is going to keep
1815          * this dquot pointer even after the trans_commit.
1816          */
1817         *IO_olddq = xfs_qm_dqhold(newdq);
1818
1819         return prevdq;
1820 }
1821
1822 int
1823 xfs_qm_vop_rename_dqattach(
1824         struct xfs_inode        **i_tab)
1825 {
1826         struct xfs_mount        *mp = i_tab[0]->i_mount;
1827         int                     i;
1828
1829         if (!XFS_IS_QUOTA_ON(mp))
1830                 return 0;
1831
1832         for (i = 0; (i < 4 && i_tab[i]); i++) {
1833                 struct xfs_inode        *ip = i_tab[i];
1834                 int                     error;
1835
1836                 /*
1837                  * Watch out for duplicate entries in the table.
1838                  */
1839                 if (i == 0 || ip != i_tab[i-1]) {
1840                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1841                                 error = xfs_qm_dqattach(ip);
1842                                 if (error)
1843                                         return error;
1844                         }
1845                 }
1846         }
1847         return 0;
1848 }
1849
1850 void
1851 xfs_qm_vop_create_dqattach(
1852         struct xfs_trans        *tp,
1853         struct xfs_inode        *ip,
1854         struct xfs_dquot        *udqp,
1855         struct xfs_dquot        *gdqp,
1856         struct xfs_dquot        *pdqp)
1857 {
1858         struct xfs_mount        *mp = tp->t_mountp;
1859
1860         if (!XFS_IS_QUOTA_ON(mp))
1861                 return;
1862
1863         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1864
1865         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1866                 ASSERT(ip->i_udquot == NULL);
1867                 ASSERT(i_uid_read(VFS_I(ip)) == udqp->q_id);
1868
1869                 ip->i_udquot = xfs_qm_dqhold(udqp);
1870                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1871         }
1872         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1873                 ASSERT(ip->i_gdquot == NULL);
1874                 ASSERT(i_gid_read(VFS_I(ip)) == gdqp->q_id);
1875
1876                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1877                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1878         }
1879         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1880                 ASSERT(ip->i_pdquot == NULL);
1881                 ASSERT(ip->i_projid == pdqp->q_id);
1882
1883                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1884                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1885         }
1886 }
1887
1888 /* Decide if this inode's dquot is near an enforcement boundary. */
1889 bool
1890 xfs_inode_near_dquot_enforcement(
1891         struct xfs_inode        *ip,
1892         xfs_dqtype_t            type)
1893 {
1894         struct xfs_dquot        *dqp;
1895         int64_t                 freesp;
1896
1897         /* We only care for quotas that are enabled and enforced. */
1898         dqp = xfs_inode_dquot(ip, type);
1899         if (!dqp || !xfs_dquot_is_enforced(dqp))
1900                 return false;
1901
1902         if (xfs_dquot_res_over_limits(&dqp->q_ino) ||
1903             xfs_dquot_res_over_limits(&dqp->q_rtb))
1904                 return true;
1905
1906         /* For space on the data device, check the various thresholds. */
1907         if (!dqp->q_prealloc_hi_wmark)
1908                 return false;
1909
1910         if (dqp->q_blk.reserved < dqp->q_prealloc_lo_wmark)
1911                 return false;
1912
1913         if (dqp->q_blk.reserved >= dqp->q_prealloc_hi_wmark)
1914                 return true;
1915
1916         freesp = dqp->q_prealloc_hi_wmark - dqp->q_blk.reserved;
1917         if (freesp < dqp->q_low_space[XFS_QLOWSP_5_PCNT])
1918                 return true;
1919
1920         return false;
1921 }