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
  29 /*
  30  * The global quota manager. There is only one of these for the entire
  31  * system, _not_ one per file system. XQM keeps track of the overall
  32  * quota functionality, including maintaining the freelist and hash
  33  * tables of dquots.
  34  */
  35 STATIC int      xfs_qm_init_quotainos(struct xfs_mount *mp);
  36 STATIC int      xfs_qm_init_quotainfo(struct xfs_mount *mp);
  37
  38 STATIC void     xfs_qm_destroy_quotainos(struct xfs_quotainfo *qi);
  39 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  40 /*
  41  * We use the batch lookup interface to iterate over the dquots as it
  42  * currently is the only interface into the radix tree code that allows
  43  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  44  * operations is fine as all callers are used either during mount/umount
  45  * or quotaoff.
  46  */
  47 #define XFS_DQ_LOOKUP_BATCH     32
  48
  49 STATIC int
  50 xfs_qm_dquot_walk(
  51         struct xfs_mount        *mp,
  52         xfs_dqtype_t            type,
  53         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  54         void                    *data)
  55 {
  56         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  57         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  58         uint32_t                next_index;
  59         int                     last_error = 0;
  60         int                     skipped;
  61         int                     nr_found;
  62
  63 restart:
  64         skipped = 0;
  65         next_index = 0;
  66         nr_found = 0;
  67
  68         while (1) {
  69                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  70                 int             error = 0;
  71                 int             i;
  72
  73                 mutex_lock(&qi->qi_tree_lock);
  74                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  75                                         next_index, XFS_DQ_LOOKUP_BATCH);
  76                 if (!nr_found) {
  77                         mutex_unlock(&qi->qi_tree_lock);
  78                         break;
  79                 }
  80
  81                 for (i = 0; i < nr_found; i++) {
  82                         struct xfs_dquot *dqp = batch[i];
  83
  84                         next_index = dqp->q_id + 1;
  85
  86                         error = execute(batch[i], data);
  87                         if (error == -EAGAIN) {
  88                                 skipped++;
  89                                 continue;
  90                         }
  91                         if (error && last_error != -EFSCORRUPTED)
  92                                 last_error = error;
  93                 }
  94
  95                 mutex_unlock(&qi->qi_tree_lock);
  96
  97                 /* bail out if the filesystem is corrupted.  */
  98                 if (last_error == -EFSCORRUPTED) {
  99                         skipped = 0;
 100                         break;
 101                 }
 102                 /* we're done if id overflows back to zero */
 103                 if (!next_index)
 104                         break;
 105         }
 106
 107         if (skipped) {
 108                 delay(1);
 109                 goto restart;
 110         }
 111
 112         return last_error;
 113 }
 114
 115
 116 /*
 117  * Purge a dquot from all tracking data structures and free it.
 118  */
 119 STATIC int
 120 xfs_qm_dqpurge(
 121         struct xfs_dquot        *dqp,
 122         void                    *data)
 123 {
 124         struct xfs_mount        *mp = dqp->q_mount;
 125         struct xfs_quotainfo    *qi = mp->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(xfs_is_shutdown(mp) ||
 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(mp, 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         defq->blk.warn = XFS_QM_BWARNLIMIT;
 586         defq->ino.warn = XFS_QM_IWARNLIMIT;
 587         defq->rtb.warn = XFS_QM_RTBWARNLIMIT;
 588
 589         /*
 590          * We try to get the limits from the superuser's limits fields.
 591          * This is quite hacky, but it is standard quota practice.
 592          *
 593          * Since we may not have done a quotacheck by this point, just read
 594          * the dquot without attaching it to any hashtables or lists.
 595          */
 596         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 597         if (error)
 598                 return;
 599
 600         /*
 601          * The warnings and timers set the grace period given to
 602          * a user or group before he or she can not perform any
 603          * more writing. If it is zero, a default is used.
 604          */
 605         if (dqp->q_blk.timer)
 606                 defq->blk.time = dqp->q_blk.timer;
 607         if (dqp->q_ino.timer)
 608                 defq->ino.time = dqp->q_ino.timer;
 609         if (dqp->q_rtb.timer)
 610                 defq->rtb.time = dqp->q_rtb.timer;
 611         if (dqp->q_blk.warnings)
 612                 defq->blk.warn = dqp->q_blk.warnings;
 613         if (dqp->q_ino.warnings)
 614                 defq->ino.warn = dqp->q_ino.warnings;
 615         if (dqp->q_rtb.warnings)
 616                 defq->rtb.warn = dqp->q_rtb.warnings;
 617
 618         xfs_qm_dqdestroy(dqp);
 619 }
 620
 621 /*
 622  * This initializes all the quota information that's kept in the
 623  * mount structure
 624  */
 625 STATIC int
 626 xfs_qm_init_quotainfo(
 627         struct xfs_mount        *mp)
 628 {
 629         struct xfs_quotainfo    *qinf;
 630         int                     error;
 631
 632         ASSERT(XFS_IS_QUOTA_ON(mp));
 633
 634         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
 635
 636         error = list_lru_init(&qinf->qi_lru);
 637         if (error)
 638                 goto out_free_qinf;
 639
 640         /*
 641          * See if quotainodes are setup, and if not, allocate them,
 642          * and change the superblock accordingly.
 643          */
 644         error = xfs_qm_init_quotainos(mp);
 645         if (error)
 646                 goto out_free_lru;
 647
 648         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 649         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 650         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 651         mutex_init(&qinf->qi_tree_lock);
 652
 653         /* mutex used to serialize quotaoffs */
 654         mutex_init(&qinf->qi_quotaofflock);
 655
 656         /* Precalc some constants */
 657         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 658         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 659         if (xfs_has_bigtime(mp)) {
 660                 qinf->qi_expiry_min =
 661                         xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MIN);
 662                 qinf->qi_expiry_max =
 663                         xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MAX);
 664         } else {
 665                 qinf->qi_expiry_min = XFS_DQ_LEGACY_EXPIRY_MIN;
 666                 qinf->qi_expiry_max = XFS_DQ_LEGACY_EXPIRY_MAX;
 667         }
 668         trace_xfs_quota_expiry_range(mp, qinf->qi_expiry_min,
 669                         qinf->qi_expiry_max);
 670
 671         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 672
 673         xfs_qm_init_timelimits(mp, XFS_DQTYPE_USER);
 674         xfs_qm_init_timelimits(mp, XFS_DQTYPE_GROUP);
 675         xfs_qm_init_timelimits(mp, XFS_DQTYPE_PROJ);
 676
 677         if (XFS_IS_UQUOTA_ON(mp))
 678                 xfs_qm_set_defquota(mp, XFS_DQTYPE_USER, qinf);
 679         if (XFS_IS_GQUOTA_ON(mp))
 680                 xfs_qm_set_defquota(mp, XFS_DQTYPE_GROUP, qinf);
 681         if (XFS_IS_PQUOTA_ON(mp))
 682                 xfs_qm_set_defquota(mp, XFS_DQTYPE_PROJ, qinf);
 683
 684         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 685         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 686         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 687         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 688
 689         error = register_shrinker(&qinf->qi_shrinker);
 690         if (error)
 691                 goto out_free_inos;
 692
 693         return 0;
 694
 695 out_free_inos:
 696         mutex_destroy(&qinf->qi_quotaofflock);
 697         mutex_destroy(&qinf->qi_tree_lock);
 698         xfs_qm_destroy_quotainos(qinf);
 699 out_free_lru:
 700         list_lru_destroy(&qinf->qi_lru);
 701 out_free_qinf:
 702         kmem_free(qinf);
 703         mp->m_quotainfo = NULL;
 704         return error;
 705 }
 706
 707 /*
 708  * Gets called when unmounting a filesystem or when all quotas get
 709  * turned off.
 710  * This purges the quota inodes, destroys locks and frees itself.
 711  */
 712 void
 713 xfs_qm_destroy_quotainfo(
 714         struct xfs_mount        *mp)
 715 {
 716         struct xfs_quotainfo    *qi;
 717
 718         qi = mp->m_quotainfo;
 719         ASSERT(qi != NULL);
 720
 721         unregister_shrinker(&qi->qi_shrinker);
 722         list_lru_destroy(&qi->qi_lru);
 723         xfs_qm_destroy_quotainos(qi);
 724         mutex_destroy(&qi->qi_tree_lock);
 725         mutex_destroy(&qi->qi_quotaofflock);
 726         kmem_free(qi);
 727         mp->m_quotainfo = NULL;
 728 }
 729
 730 /*
 731  * Create an inode and return with a reference already taken, but unlocked
 732  * This is how we create quota inodes
 733  */
 734 STATIC int
 735 xfs_qm_qino_alloc(
 736         struct xfs_mount        *mp,
 737         struct xfs_inode        **ipp,
 738         unsigned int            flags)
 739 {
 740         struct xfs_trans        *tp;
 741         int                     error;
 742         bool                    need_alloc = true;
 743
 744         *ipp = NULL;
 745         /*
 746          * With superblock that doesn't have separate pquotino, we
 747          * share an inode between gquota and pquota. If the on-disk
 748          * superblock has GQUOTA and the filesystem is now mounted
 749          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 750          * vice-versa.
 751          */
 752         if (!xfs_has_pquotino(mp) &&
 753                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 754                 xfs_ino_t ino = NULLFSINO;
 755
 756                 if ((flags & XFS_QMOPT_PQUOTA) &&
 757                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 758                         ino = mp->m_sb.sb_gquotino;
 759                         if (XFS_IS_CORRUPT(mp,
 760                                            mp->m_sb.sb_pquotino != NULLFSINO))
 761                                 return -EFSCORRUPTED;
 762                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 763                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 764                         ino = mp->m_sb.sb_pquotino;
 765                         if (XFS_IS_CORRUPT(mp,
 766                                            mp->m_sb.sb_gquotino != NULLFSINO))
 767                                 return -EFSCORRUPTED;
 768                 }
 769                 if (ino != NULLFSINO) {
 770                         error = xfs_iget(mp, NULL, ino, 0, 0, ipp);
 771                         if (error)
 772                                 return error;
 773                         mp->m_sb.sb_gquotino = NULLFSINO;
 774                         mp->m_sb.sb_pquotino = NULLFSINO;
 775                         need_alloc = false;
 776                 }
 777         }
 778
 779         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 780                         need_alloc ? XFS_QM_QINOCREATE_SPACE_RES(mp) : 0,
 781                         0, 0, &tp);
 782         if (error)
 783                 return error;
 784
 785         if (need_alloc) {
 786                 xfs_ino_t       ino;
 787
 788                 error = xfs_dialloc(&tp, 0, S_IFREG, &ino);
 789                 if (!error)
 790                         error = xfs_init_new_inode(&init_user_ns, tp, NULL, ino,
 791                                         S_IFREG, 1, 0, 0, false, ipp);
 792                 if (error) {
 793                         xfs_trans_cancel(tp);
 794                         return error;
 795                 }
 796         }
 797
 798         /*
 799          * Make the changes in the superblock, and log those too.
 800          * sbfields arg may contain fields other than *QUOTINO;
 801          * VERSIONNUM for example.
 802          */
 803         spin_lock(&mp->m_sb_lock);
 804         if (flags & XFS_QMOPT_SBVERSION) {
 805                 ASSERT(!xfs_has_quota(mp));
 806
 807                 xfs_add_quota(mp);
 808                 mp->m_sb.sb_uquotino = NULLFSINO;
 809                 mp->m_sb.sb_gquotino = NULLFSINO;
 810                 mp->m_sb.sb_pquotino = NULLFSINO;
 811
 812                 /* qflags will get updated fully _after_ quotacheck */
 813                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 814         }
 815         if (flags & XFS_QMOPT_UQUOTA)
 816                 mp->m_sb.sb_uquotino = (*ipp)->i_ino;
 817         else if (flags & XFS_QMOPT_GQUOTA)
 818                 mp->m_sb.sb_gquotino = (*ipp)->i_ino;
 819         else
 820                 mp->m_sb.sb_pquotino = (*ipp)->i_ino;
 821         spin_unlock(&mp->m_sb_lock);
 822         xfs_log_sb(tp);
 823
 824         error = xfs_trans_commit(tp);
 825         if (error) {
 826                 ASSERT(xfs_is_shutdown(mp));
 827                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 828         }
 829         if (need_alloc)
 830                 xfs_finish_inode_setup(*ipp);
 831         return error;
 832 }
 833
 834
 835 STATIC void
 836 xfs_qm_reset_dqcounts(
 837         struct xfs_mount        *mp,
 838         struct xfs_buf          *bp,
 839         xfs_dqid_t              id,
 840         xfs_dqtype_t            type)
 841 {
 842         struct xfs_dqblk        *dqb;
 843         int                     j;
 844
 845         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 846
 847         /*
 848          * Reset all counters and timers. They'll be
 849          * started afresh by xfs_qm_quotacheck.
 850          */
 851 #ifdef DEBUG
 852         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 853                 sizeof(xfs_dqblk_t);
 854         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 855 #endif
 856         dqb = bp->b_addr;
 857         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 858                 struct xfs_disk_dquot   *ddq;
 859
 860                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 861
 862                 /*
 863                  * Do a sanity check, and if needed, repair the dqblk. Don't
 864                  * output any warnings because it's perfectly possible to
 865                  * find uninitialised dquot blks. See comment in
 866                  * xfs_dquot_verify.
 867                  */
 868                 if (xfs_dqblk_verify(mp, &dqb[j], id + j) ||
 869                     (dqb[j].dd_diskdq.d_type & XFS_DQTYPE_REC_MASK) != type)
 870                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 871
 872                 /*
 873                  * Reset type in case we are reusing group quota file for
 874                  * project quotas or vice versa
 875                  */
 876                 ddq->d_type = type;
 877                 ddq->d_bcount = 0;
 878                 ddq->d_icount = 0;
 879                 ddq->d_rtbcount = 0;
 880
 881                 /*
 882                  * dquot id 0 stores the default grace period and the maximum
 883                  * warning limit that were set by the administrator, so we
 884                  * should not reset them.
 885                  */
 886                 if (ddq->d_id != 0) {
 887                         ddq->d_btimer = 0;
 888                         ddq->d_itimer = 0;
 889                         ddq->d_rtbtimer = 0;
 890                         ddq->d_bwarns = 0;
 891                         ddq->d_iwarns = 0;
 892                         ddq->d_rtbwarns = 0;
 893                         if (xfs_has_bigtime(mp))
 894                                 ddq->d_type |= XFS_DQTYPE_BIGTIME;
 895                 }
 896
 897                 if (xfs_has_crc(mp)) {
 898                         xfs_update_cksum((char *)&dqb[j],
 899                                          sizeof(struct xfs_dqblk),
 900                                          XFS_DQUOT_CRC_OFF);
 901                 }
 902         }
 903 }
 904
 905 STATIC int
 906 xfs_qm_reset_dqcounts_all(
 907         struct xfs_mount        *mp,
 908         xfs_dqid_t              firstid,
 909         xfs_fsblock_t           bno,
 910         xfs_filblks_t           blkcnt,
 911         xfs_dqtype_t            type,
 912         struct list_head        *buffer_list)
 913 {
 914         struct xfs_buf          *bp;
 915         int                     error = 0;
 916
 917         ASSERT(blkcnt > 0);
 918
 919         /*
 920          * Blkcnt arg can be a very big number, and might even be
 921          * larger than the log itself. So, we have to break it up into
 922          * manageable-sized transactions.
 923          * Note that we don't start a permanent transaction here; we might
 924          * not be able to get a log reservation for the whole thing up front,
 925          * and we don't really care to either, because we just discard
 926          * everything if we were to crash in the middle of this loop.
 927          */
 928         while (blkcnt--) {
 929                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 930                               XFS_FSB_TO_DADDR(mp, bno),
 931                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 932                               &xfs_dquot_buf_ops);
 933
 934                 /*
 935                  * CRC and validation errors will return a EFSCORRUPTED here. If
 936                  * this occurs, re-read without CRC validation so that we can
 937                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 938                  * will leave a trace in the log indicating corruption has
 939                  * been detected.
 940                  */
 941                 if (error == -EFSCORRUPTED) {
 942                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 943                                       XFS_FSB_TO_DADDR(mp, bno),
 944                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 945                                       NULL);
 946                 }
 947
 948                 if (error)
 949                         break;
 950
 951                 /*
 952                  * A corrupt buffer might not have a verifier attached, so
 953                  * make sure we have the correct one attached before writeback
 954                  * occurs.
 955                  */
 956                 bp->b_ops = &xfs_dquot_buf_ops;
 957                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 958                 xfs_buf_delwri_queue(bp, buffer_list);
 959                 xfs_buf_relse(bp);
 960
 961                 /* goto the next block. */
 962                 bno++;
 963                 firstid += mp->m_quotainfo->qi_dqperchunk;
 964         }
 965
 966         return error;
 967 }
 968
 969 /*
 970  * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 971  * counters for every chunk of dquots that we find.
 972  */
 973 STATIC int
 974 xfs_qm_reset_dqcounts_buf(
 975         struct xfs_mount        *mp,
 976         struct xfs_inode        *qip,
 977         xfs_dqtype_t            type,
 978         struct list_head        *buffer_list)
 979 {
 980         struct xfs_bmbt_irec    *map;
 981         int                     i, nmaps;       /* number of map entries */
 982         int                     error;          /* return value */
 983         xfs_fileoff_t           lblkno;
 984         xfs_filblks_t           maxlblkcnt;
 985         xfs_dqid_t              firstid;
 986         xfs_fsblock_t           rablkno;
 987         xfs_filblks_t           rablkcnt;
 988
 989         error = 0;
 990         /*
 991          * This looks racy, but we can't keep an inode lock across a
 992          * trans_reserve. But, this gets called during quotacheck, and that
 993          * happens only at mount time which is single threaded.
 994          */
 995         if (qip->i_nblocks == 0)
 996                 return 0;
 997
 998         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
 999
1000         lblkno = 0;
1001         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
1002         do {
1003                 uint            lock_mode;
1004
1005                 nmaps = XFS_DQITER_MAP_SIZE;
1006                 /*
1007                  * We aren't changing the inode itself. Just changing
1008                  * some of its data. No new blocks are added here, and
1009                  * the inode is never added to the transaction.
1010                  */
1011                 lock_mode = xfs_ilock_data_map_shared(qip);
1012                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1013                                        map, &nmaps, 0);
1014                 xfs_iunlock(qip, lock_mode);
1015                 if (error)
1016                         break;
1017
1018                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1019                 for (i = 0; i < nmaps; i++) {
1020                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1021                         ASSERT(map[i].br_blockcount);
1022
1023
1024                         lblkno += map[i].br_blockcount;
1025
1026                         if (map[i].br_startblock == HOLESTARTBLOCK)
1027                                 continue;
1028
1029                         firstid = (xfs_dqid_t) map[i].br_startoff *
1030                                 mp->m_quotainfo->qi_dqperchunk;
1031                         /*
1032                          * Do a read-ahead on the next extent.
1033                          */
1034                         if ((i+1 < nmaps) &&
1035                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1036                                 rablkcnt =  map[i+1].br_blockcount;
1037                                 rablkno = map[i+1].br_startblock;
1038                                 while (rablkcnt--) {
1039                                         xfs_buf_readahead(mp->m_ddev_targp,
1040                                                XFS_FSB_TO_DADDR(mp, rablkno),
1041                                                mp->m_quotainfo->qi_dqchunklen,
1042                                                &xfs_dquot_buf_ops);
1043                                         rablkno++;
1044                                 }
1045                         }
1046                         /*
1047                          * Iterate thru all the blks in the extent and
1048                          * reset the counters of all the dquots inside them.
1049                          */
1050                         error = xfs_qm_reset_dqcounts_all(mp, firstid,
1051                                                    map[i].br_startblock,
1052                                                    map[i].br_blockcount,
1053                                                    type, buffer_list);
1054                         if (error)
1055                                 goto out;
1056                 }
1057         } while (nmaps > 0);
1058
1059 out:
1060         kmem_free(map);
1061         return error;
1062 }
1063
1064 /*
1065  * Called by dqusage_adjust in doing a quotacheck.
1066  *
1067  * Given the inode, and a dquot id this updates both the incore dqout as well
1068  * as the buffer copy. This is so that once the quotacheck is done, we can
1069  * just log all the buffers, as opposed to logging numerous updates to
1070  * individual dquots.
1071  */
1072 STATIC int
1073 xfs_qm_quotacheck_dqadjust(
1074         struct xfs_inode        *ip,
1075         xfs_dqtype_t            type,
1076         xfs_qcnt_t              nblks,
1077         xfs_qcnt_t              rtblks)
1078 {
1079         struct xfs_mount        *mp = ip->i_mount;
1080         struct xfs_dquot        *dqp;
1081         xfs_dqid_t              id;
1082         int                     error;
1083
1084         id = xfs_qm_id_for_quotatype(ip, type);
1085         error = xfs_qm_dqget(mp, id, type, true, &dqp);
1086         if (error) {
1087                 /*
1088                  * Shouldn't be able to turn off quotas here.
1089                  */
1090                 ASSERT(error != -ESRCH);
1091                 ASSERT(error != -ENOENT);
1092                 return error;
1093         }
1094
1095         trace_xfs_dqadjust(dqp);
1096
1097         /*
1098          * Adjust the inode count and the block count to reflect this inode's
1099          * resource usage.
1100          */
1101         dqp->q_ino.count++;
1102         dqp->q_ino.reserved++;
1103         if (nblks) {
1104                 dqp->q_blk.count += nblks;
1105                 dqp->q_blk.reserved += nblks;
1106         }
1107         if (rtblks) {
1108                 dqp->q_rtb.count += rtblks;
1109                 dqp->q_rtb.reserved += rtblks;
1110         }
1111
1112         /*
1113          * Set default limits, adjust timers (since we changed usages)
1114          *
1115          * There are no timers for the default values set in the root dquot.
1116          */
1117         if (dqp->q_id) {
1118                 xfs_qm_adjust_dqlimits(dqp);
1119                 xfs_qm_adjust_dqtimers(dqp);
1120         }
1121
1122         dqp->q_flags |= XFS_DQFLAG_DIRTY;
1123         xfs_qm_dqput(dqp);
1124         return 0;
1125 }
1126
1127 /*
1128  * callback routine supplied to bulkstat(). Given an inumber, find its
1129  * dquots and update them to account for resources taken by that inode.
1130  */
1131 /* ARGSUSED */
1132 STATIC int
1133 xfs_qm_dqusage_adjust(
1134         struct xfs_mount        *mp,
1135         struct xfs_trans        *tp,
1136         xfs_ino_t               ino,
1137         void                    *data)
1138 {
1139         struct xfs_inode        *ip;
1140         xfs_qcnt_t              nblks;
1141         xfs_filblks_t           rtblks = 0;     /* total rt blks */
1142         int                     error;
1143
1144         ASSERT(XFS_IS_QUOTA_ON(mp));
1145
1146         /*
1147          * rootino must have its resources accounted for, not so with the quota
1148          * inodes.
1149          */
1150         if (xfs_is_quota_inode(&mp->m_sb, ino))
1151                 return 0;
1152
1153         /*
1154          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1155          * at mount time and therefore nobody will be racing chown/chproj.
1156          */
1157         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1158         if (error == -EINVAL || error == -ENOENT)
1159                 return 0;
1160         if (error)
1161                 return error;
1162
1163         ASSERT(ip->i_delayed_blks == 0);
1164
1165         if (XFS_IS_REALTIME_INODE(ip)) {
1166                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1167
1168                 error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1169                 if (error)
1170                         goto error0;
1171
1172                 xfs_bmap_count_leaves(ifp, &rtblks);
1173         }
1174
1175         nblks = (xfs_qcnt_t)ip->i_nblocks - rtblks;
1176
1177         /*
1178          * Add the (disk blocks and inode) resources occupied by this
1179          * inode to its dquots. We do this adjustment in the incore dquot,
1180          * and also copy the changes to its buffer.
1181          * We don't care about putting these changes in a transaction
1182          * envelope because if we crash in the middle of a 'quotacheck'
1183          * we have to start from the beginning anyway.
1184          * Once we're done, we'll log all the dquot bufs.
1185          *
1186          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1187          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1188          */
1189         if (XFS_IS_UQUOTA_ON(mp)) {
1190                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_USER, nblks,
1191                                 rtblks);
1192                 if (error)
1193                         goto error0;
1194         }
1195
1196         if (XFS_IS_GQUOTA_ON(mp)) {
1197                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_GROUP, nblks,
1198                                 rtblks);
1199                 if (error)
1200                         goto error0;
1201         }
1202
1203         if (XFS_IS_PQUOTA_ON(mp)) {
1204                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_PROJ, nblks,
1205                                 rtblks);
1206                 if (error)
1207                         goto error0;
1208         }
1209
1210 error0:
1211         xfs_irele(ip);
1212         return error;
1213 }
1214
1215 STATIC int
1216 xfs_qm_flush_one(
1217         struct xfs_dquot        *dqp,
1218         void                    *data)
1219 {
1220         struct xfs_mount        *mp = dqp->q_mount;
1221         struct list_head        *buffer_list = data;
1222         struct xfs_buf          *bp = NULL;
1223         int                     error = 0;
1224
1225         xfs_dqlock(dqp);
1226         if (dqp->q_flags & XFS_DQFLAG_FREEING)
1227                 goto out_unlock;
1228         if (!XFS_DQ_IS_DIRTY(dqp))
1229                 goto out_unlock;
1230
1231         /*
1232          * The only way the dquot is already flush locked by the time quotacheck
1233          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1234          * it for the final time. Quotacheck collects all dquot bufs in the
1235          * local delwri queue before dquots are dirtied, so reclaim can't have
1236          * possibly queued it for I/O. The only way out is to push the buffer to
1237          * cycle the flush lock.
1238          */
1239         if (!xfs_dqflock_nowait(dqp)) {
1240                 /* buf is pinned in-core by delwri list */
1241                 bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1242                                 mp->m_quotainfo->qi_dqchunklen, 0);
1243                 if (!bp) {
1244                         error = -EINVAL;
1245                         goto out_unlock;
1246                 }
1247                 xfs_buf_unlock(bp);
1248
1249                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1250                 xfs_buf_rele(bp);
1251
1252                 error = -EAGAIN;
1253                 goto out_unlock;
1254         }
1255
1256         error = xfs_qm_dqflush(dqp, &bp);
1257         if (error)
1258                 goto out_unlock;
1259
1260         xfs_buf_delwri_queue(bp, buffer_list);
1261         xfs_buf_relse(bp);
1262 out_unlock:
1263         xfs_dqunlock(dqp);
1264         return error;
1265 }
1266
1267 /*
1268  * Walk thru all the filesystem inodes and construct a consistent view
1269  * of the disk quota world. If the quotacheck fails, disable quotas.
1270  */
1271 STATIC int
1272 xfs_qm_quotacheck(
1273         xfs_mount_t     *mp)
1274 {
1275         int                     error, error2;
1276         uint                    flags;
1277         LIST_HEAD               (buffer_list);
1278         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1279         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1280         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1281
1282         flags = 0;
1283
1284         ASSERT(uip || gip || pip);
1285         ASSERT(XFS_IS_QUOTA_ON(mp));
1286
1287         xfs_notice(mp, "Quotacheck needed: Please wait.");
1288
1289         /*
1290          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1291          * their counters to zero. We need a clean slate.
1292          * We don't log our changes till later.
1293          */
1294         if (uip) {
1295                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_DQTYPE_USER,
1296                                          &buffer_list);
1297                 if (error)
1298                         goto error_return;
1299                 flags |= XFS_UQUOTA_CHKD;
1300         }
1301
1302         if (gip) {
1303                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_DQTYPE_GROUP,
1304                                          &buffer_list);
1305                 if (error)
1306                         goto error_return;
1307                 flags |= XFS_GQUOTA_CHKD;
1308         }
1309
1310         if (pip) {
1311                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_DQTYPE_PROJ,
1312                                          &buffer_list);
1313                 if (error)
1314                         goto error_return;
1315                 flags |= XFS_PQUOTA_CHKD;
1316         }
1317
1318         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1319                         NULL);
1320         if (error)
1321                 goto error_return;
1322
1323         /*
1324          * We've made all the changes that we need to make incore.  Flush them
1325          * down to disk buffers if everything was updated successfully.
1326          */
1327         if (XFS_IS_UQUOTA_ON(mp)) {
1328                 error = xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_flush_one,
1329                                           &buffer_list);
1330         }
1331         if (XFS_IS_GQUOTA_ON(mp)) {
1332                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_flush_one,
1333                                            &buffer_list);
1334                 if (!error)
1335                         error = error2;
1336         }
1337         if (XFS_IS_PQUOTA_ON(mp)) {
1338                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_flush_one,
1339                                            &buffer_list);
1340                 if (!error)
1341                         error = error2;
1342         }
1343
1344         error2 = xfs_buf_delwri_submit(&buffer_list);
1345         if (!error)
1346                 error = error2;
1347
1348         /*
1349          * We can get this error if we couldn't do a dquot allocation inside
1350          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1351          * dirty dquots that might be cached, we just want to get rid of them
1352          * and turn quotaoff. The dquots won't be attached to any of the inodes
1353          * at this point (because we intentionally didn't in dqget_noattach).
1354          */
1355         if (error) {
1356                 xfs_qm_dqpurge_all(mp);
1357                 goto error_return;
1358         }
1359
1360         /*
1361          * If one type of quotas is off, then it will lose its
1362          * quotachecked status, since we won't be doing accounting for
1363          * that type anymore.
1364          */
1365         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1366         mp->m_qflags |= flags;
1367
1368  error_return:
1369         xfs_buf_delwri_cancel(&buffer_list);
1370
1371         if (error) {
1372                 xfs_warn(mp,
1373         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1374                         error);
1375                 /*
1376                  * We must turn off quotas.
1377                  */
1378                 ASSERT(mp->m_quotainfo != NULL);
1379                 xfs_qm_destroy_quotainfo(mp);
1380                 if (xfs_mount_reset_sbqflags(mp)) {
1381                         xfs_warn(mp,
1382                                 "Quotacheck: Failed to reset quota flags.");
1383                 }
1384         } else
1385                 xfs_notice(mp, "Quotacheck: Done.");
1386         return error;
1387 }
1388
1389 /*
1390  * This is called from xfs_mountfs to start quotas and initialize all
1391  * necessary data structures like quotainfo.  This is also responsible for
1392  * running a quotacheck as necessary.  We are guaranteed that the superblock
1393  * is consistently read in at this point.
1394  *
1395  * If we fail here, the mount will continue with quota turned off. We don't
1396  * need to inidicate success or failure at all.
1397  */
1398 void
1399 xfs_qm_mount_quotas(
1400         struct xfs_mount        *mp)
1401 {
1402         int                     error = 0;
1403         uint                    sbf;
1404
1405         /*
1406          * If quotas on realtime volumes is not supported, we disable
1407          * quotas immediately.
1408          */
1409         if (mp->m_sb.sb_rextents) {
1410                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1411                 mp->m_qflags = 0;
1412                 goto write_changes;
1413         }
1414
1415         ASSERT(XFS_IS_QUOTA_ON(mp));
1416
1417         /*
1418          * Allocate the quotainfo structure inside the mount struct, and
1419          * create quotainode(s), and change/rev superblock if necessary.
1420          */
1421         error = xfs_qm_init_quotainfo(mp);
1422         if (error) {
1423                 /*
1424                  * We must turn off quotas.
1425                  */
1426                 ASSERT(mp->m_quotainfo == NULL);
1427                 mp->m_qflags = 0;
1428                 goto write_changes;
1429         }
1430         /*
1431          * If any of the quotas are not consistent, do a quotacheck.
1432          */
1433         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1434                 error = xfs_qm_quotacheck(mp);
1435                 if (error) {
1436                         /* Quotacheck failed and disabled quotas. */
1437                         return;
1438                 }
1439         }
1440         /*
1441          * If one type of quotas is off, then it will lose its
1442          * quotachecked status, since we won't be doing accounting for
1443          * that type anymore.
1444          */
1445         if (!XFS_IS_UQUOTA_ON(mp))
1446                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1447         if (!XFS_IS_GQUOTA_ON(mp))
1448                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1449         if (!XFS_IS_PQUOTA_ON(mp))
1450                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1451
1452  write_changes:
1453         /*
1454          * We actually don't have to acquire the m_sb_lock at all.
1455          * This can only be called from mount, and that's single threaded. XXX
1456          */
1457         spin_lock(&mp->m_sb_lock);
1458         sbf = mp->m_sb.sb_qflags;
1459         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1460         spin_unlock(&mp->m_sb_lock);
1461
1462         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1463                 if (xfs_sync_sb(mp, false)) {
1464                         /*
1465                          * We could only have been turning quotas off.
1466                          * We aren't in very good shape actually because
1467                          * the incore structures are convinced that quotas are
1468                          * off, but the on disk superblock doesn't know that !
1469                          */
1470                         ASSERT(!(XFS_IS_QUOTA_ON(mp)));
1471                         xfs_alert(mp, "%s: Superblock update failed!",
1472                                 __func__);
1473                 }
1474         }
1475
1476         if (error) {
1477                 xfs_warn(mp, "Failed to initialize disk quotas.");
1478                 return;
1479         }
1480 }
1481
1482 /*
1483  * This is called after the superblock has been read in and we're ready to
1484  * iget the quota inodes.
1485  */
1486 STATIC int
1487 xfs_qm_init_quotainos(
1488         xfs_mount_t     *mp)
1489 {
1490         struct xfs_inode        *uip = NULL;
1491         struct xfs_inode        *gip = NULL;
1492         struct xfs_inode        *pip = NULL;
1493         int                     error;
1494         uint                    flags = 0;
1495
1496         ASSERT(mp->m_quotainfo);
1497
1498         /*
1499          * Get the uquota and gquota inodes
1500          */
1501         if (xfs_has_quota(mp)) {
1502                 if (XFS_IS_UQUOTA_ON(mp) &&
1503                     mp->m_sb.sb_uquotino != NULLFSINO) {
1504                         ASSERT(mp->m_sb.sb_uquotino > 0);
1505                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1506                                              0, 0, &uip);
1507                         if (error)
1508                                 return error;
1509                 }
1510                 if (XFS_IS_GQUOTA_ON(mp) &&
1511                     mp->m_sb.sb_gquotino != NULLFSINO) {
1512                         ASSERT(mp->m_sb.sb_gquotino > 0);
1513                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1514                                              0, 0, &gip);
1515                         if (error)
1516                                 goto error_rele;
1517                 }
1518                 if (XFS_IS_PQUOTA_ON(mp) &&
1519                     mp->m_sb.sb_pquotino != NULLFSINO) {
1520                         ASSERT(mp->m_sb.sb_pquotino > 0);
1521                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1522                                              0, 0, &pip);
1523                         if (error)
1524                                 goto error_rele;
1525                 }
1526         } else {
1527                 flags |= XFS_QMOPT_SBVERSION;
1528         }
1529
1530         /*
1531          * Create the three inodes, if they don't exist already. The changes
1532          * made above will get added to a transaction and logged in one of
1533          * the qino_alloc calls below.  If the device is readonly,
1534          * temporarily switch to read-write to do this.
1535          */
1536         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1537                 error = xfs_qm_qino_alloc(mp, &uip,
1538                                               flags | XFS_QMOPT_UQUOTA);
1539                 if (error)
1540                         goto error_rele;
1541
1542                 flags &= ~XFS_QMOPT_SBVERSION;
1543         }
1544         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1545                 error = xfs_qm_qino_alloc(mp, &gip,
1546                                           flags | XFS_QMOPT_GQUOTA);
1547                 if (error)
1548                         goto error_rele;
1549
1550                 flags &= ~XFS_QMOPT_SBVERSION;
1551         }
1552         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1553                 error = xfs_qm_qino_alloc(mp, &pip,
1554                                           flags | XFS_QMOPT_PQUOTA);
1555                 if (error)
1556                         goto error_rele;
1557         }
1558
1559         mp->m_quotainfo->qi_uquotaip = uip;
1560         mp->m_quotainfo->qi_gquotaip = gip;
1561         mp->m_quotainfo->qi_pquotaip = pip;
1562
1563         return 0;
1564
1565 error_rele:
1566         if (uip)
1567                 xfs_irele(uip);
1568         if (gip)
1569                 xfs_irele(gip);
1570         if (pip)
1571                 xfs_irele(pip);
1572         return error;
1573 }
1574
1575 STATIC void
1576 xfs_qm_destroy_quotainos(
1577         struct xfs_quotainfo    *qi)
1578 {
1579         if (qi->qi_uquotaip) {
1580                 xfs_irele(qi->qi_uquotaip);
1581                 qi->qi_uquotaip = NULL; /* paranoia */
1582         }
1583         if (qi->qi_gquotaip) {
1584                 xfs_irele(qi->qi_gquotaip);
1585                 qi->qi_gquotaip = NULL;
1586         }
1587         if (qi->qi_pquotaip) {
1588                 xfs_irele(qi->qi_pquotaip);
1589                 qi->qi_pquotaip = NULL;
1590         }
1591 }
1592
1593 STATIC void
1594 xfs_qm_dqfree_one(
1595         struct xfs_dquot        *dqp)
1596 {
1597         struct xfs_mount        *mp = dqp->q_mount;
1598         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1599
1600         mutex_lock(&qi->qi_tree_lock);
1601         radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
1602
1603         qi->qi_dquots--;
1604         mutex_unlock(&qi->qi_tree_lock);
1605
1606         xfs_qm_dqdestroy(dqp);
1607 }
1608
1609 /* --------------- utility functions for vnodeops ---------------- */
1610
1611
1612 /*
1613  * Given an inode, a uid, gid and prid make sure that we have
1614  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1615  * quotas by creating this file.
1616  * This also attaches dquot(s) to the given inode after locking it,
1617  * and returns the dquots corresponding to the uid and/or gid.
1618  *
1619  * in   : inode (unlocked)
1620  * out  : udquot, gdquot with references taken and unlocked
1621  */
1622 int
1623 xfs_qm_vop_dqalloc(
1624         struct xfs_inode        *ip,
1625         kuid_t                  uid,
1626         kgid_t                  gid,
1627         prid_t                  prid,
1628         uint                    flags,
1629         struct xfs_dquot        **O_udqpp,
1630         struct xfs_dquot        **O_gdqpp,
1631         struct xfs_dquot        **O_pdqpp)
1632 {
1633         struct xfs_mount        *mp = ip->i_mount;
1634         struct inode            *inode = VFS_I(ip);
1635         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1636         struct xfs_dquot        *uq = NULL;
1637         struct xfs_dquot        *gq = NULL;
1638         struct xfs_dquot        *pq = NULL;
1639         int                     error;
1640         uint                    lockflags;
1641
1642         if (!XFS_IS_QUOTA_ON(mp))
1643                 return 0;
1644
1645         lockflags = XFS_ILOCK_EXCL;
1646         xfs_ilock(ip, lockflags);
1647
1648         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1649                 gid = inode->i_gid;
1650
1651         /*
1652          * Attach the dquot(s) to this inode, doing a dquot allocation
1653          * if necessary. The dquot(s) will not be locked.
1654          */
1655         if (XFS_NOT_DQATTACHED(mp, ip)) {
1656                 error = xfs_qm_dqattach_locked(ip, true);
1657                 if (error) {
1658                         xfs_iunlock(ip, lockflags);
1659                         return error;
1660                 }
1661         }
1662
1663         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1664                 ASSERT(O_udqpp);
1665                 if (!uid_eq(inode->i_uid, uid)) {
1666                         /*
1667                          * What we need is the dquot that has this uid, and
1668                          * if we send the inode to dqget, the uid of the inode
1669                          * takes priority over what's sent in the uid argument.
1670                          * We must unlock inode here before calling dqget if
1671                          * we're not sending the inode, because otherwise
1672                          * we'll deadlock by doing trans_reserve while
1673                          * holding ilock.
1674                          */
1675                         xfs_iunlock(ip, lockflags);
1676                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1677                                         XFS_DQTYPE_USER, true, &uq);
1678                         if (error) {
1679                                 ASSERT(error != -ENOENT);
1680                                 return error;
1681                         }
1682                         /*
1683                          * Get the ilock in the right order.
1684                          */
1685                         xfs_dqunlock(uq);
1686                         lockflags = XFS_ILOCK_SHARED;
1687                         xfs_ilock(ip, lockflags);
1688                 } else {
1689                         /*
1690                          * Take an extra reference, because we'll return
1691                          * this to caller
1692                          */
1693                         ASSERT(ip->i_udquot);
1694                         uq = xfs_qm_dqhold(ip->i_udquot);
1695                 }
1696         }
1697         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1698                 ASSERT(O_gdqpp);
1699                 if (!gid_eq(inode->i_gid, gid)) {
1700                         xfs_iunlock(ip, lockflags);
1701                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1702                                         XFS_DQTYPE_GROUP, true, &gq);
1703                         if (error) {
1704                                 ASSERT(error != -ENOENT);
1705                                 goto error_rele;
1706                         }
1707                         xfs_dqunlock(gq);
1708                         lockflags = XFS_ILOCK_SHARED;
1709                         xfs_ilock(ip, lockflags);
1710                 } else {
1711                         ASSERT(ip->i_gdquot);
1712                         gq = xfs_qm_dqhold(ip->i_gdquot);
1713                 }
1714         }
1715         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1716                 ASSERT(O_pdqpp);
1717                 if (ip->i_projid != prid) {
1718                         xfs_iunlock(ip, lockflags);
1719                         error = xfs_qm_dqget(mp, prid,
1720                                         XFS_DQTYPE_PROJ, true, &pq);
1721                         if (error) {
1722                                 ASSERT(error != -ENOENT);
1723                                 goto error_rele;
1724                         }
1725                         xfs_dqunlock(pq);
1726                         lockflags = XFS_ILOCK_SHARED;
1727                         xfs_ilock(ip, lockflags);
1728                 } else {
1729                         ASSERT(ip->i_pdquot);
1730                         pq = xfs_qm_dqhold(ip->i_pdquot);
1731                 }
1732         }
1733         trace_xfs_dquot_dqalloc(ip);
1734
1735         xfs_iunlock(ip, lockflags);
1736         if (O_udqpp)
1737                 *O_udqpp = uq;
1738         else
1739                 xfs_qm_dqrele(uq);
1740         if (O_gdqpp)
1741                 *O_gdqpp = gq;
1742         else
1743                 xfs_qm_dqrele(gq);
1744         if (O_pdqpp)
1745                 *O_pdqpp = pq;
1746         else
1747                 xfs_qm_dqrele(pq);
1748         return 0;
1749
1750 error_rele:
1751         xfs_qm_dqrele(gq);
1752         xfs_qm_dqrele(uq);
1753         return error;
1754 }
1755
1756 /*
1757  * Actually transfer ownership, and do dquot modifications.
1758  * These were already reserved.
1759  */
1760 struct xfs_dquot *
1761 xfs_qm_vop_chown(
1762         struct xfs_trans        *tp,
1763         struct xfs_inode        *ip,
1764         struct xfs_dquot        **IO_olddq,
1765         struct xfs_dquot        *newdq)
1766 {
1767         struct xfs_dquot        *prevdq;
1768         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1769                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1770
1771
1772         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1773         ASSERT(XFS_IS_QUOTA_ON(ip->i_mount));
1774
1775         /* old dquot */
1776         prevdq = *IO_olddq;
1777         ASSERT(prevdq);
1778         ASSERT(prevdq != newdq);
1779
1780         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_nblocks));
1781         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1782
1783         /* the sparkling new dquot */
1784         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_nblocks);
1785         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1786
1787         /*
1788          * Back when we made quota reservations for the chown, we reserved the
1789          * ondisk blocks + delalloc blocks with the new dquot.  Now that we've
1790          * switched the dquots, decrease the new dquot's block reservation
1791          * (having already bumped up the real counter) so that we don't have
1792          * any reservation to give back when we commit.
1793          */
1794         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_RES_BLKS,
1795                         -ip->i_delayed_blks);
1796
1797         /*
1798          * Give the incore reservation for delalloc blocks back to the old
1799          * dquot.  We don't normally handle delalloc quota reservations
1800          * transactionally, so just lock the dquot and subtract from the
1801          * reservation.  Dirty the transaction because it's too late to turn
1802          * back now.
1803          */
1804         tp->t_flags |= XFS_TRANS_DIRTY;
1805         xfs_dqlock(prevdq);
1806         ASSERT(prevdq->q_blk.reserved >= ip->i_delayed_blks);
1807         prevdq->q_blk.reserved -= ip->i_delayed_blks;
1808         xfs_dqunlock(prevdq);
1809
1810         /*
1811          * Take an extra reference, because the inode is going to keep
1812          * this dquot pointer even after the trans_commit.
1813          */
1814         *IO_olddq = xfs_qm_dqhold(newdq);
1815
1816         return prevdq;
1817 }
1818
1819 int
1820 xfs_qm_vop_rename_dqattach(
1821         struct xfs_inode        **i_tab)
1822 {
1823         struct xfs_mount        *mp = i_tab[0]->i_mount;
1824         int                     i;
1825
1826         if (!XFS_IS_QUOTA_ON(mp))
1827                 return 0;
1828
1829         for (i = 0; (i < 4 && i_tab[i]); i++) {
1830                 struct xfs_inode        *ip = i_tab[i];
1831                 int                     error;
1832
1833                 /*
1834                  * Watch out for duplicate entries in the table.
1835                  */
1836                 if (i == 0 || ip != i_tab[i-1]) {
1837                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1838                                 error = xfs_qm_dqattach(ip);
1839                                 if (error)
1840                                         return error;
1841                         }
1842                 }
1843         }
1844         return 0;
1845 }
1846
1847 void
1848 xfs_qm_vop_create_dqattach(
1849         struct xfs_trans        *tp,
1850         struct xfs_inode        *ip,
1851         struct xfs_dquot        *udqp,
1852         struct xfs_dquot        *gdqp,
1853         struct xfs_dquot        *pdqp)
1854 {
1855         struct xfs_mount        *mp = tp->t_mountp;
1856
1857         if (!XFS_IS_QUOTA_ON(mp))
1858                 return;
1859
1860         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1861
1862         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1863                 ASSERT(ip->i_udquot == NULL);
1864                 ASSERT(i_uid_read(VFS_I(ip)) == udqp->q_id);
1865
1866                 ip->i_udquot = xfs_qm_dqhold(udqp);
1867                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1868         }
1869         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1870                 ASSERT(ip->i_gdquot == NULL);
1871                 ASSERT(i_gid_read(VFS_I(ip)) == gdqp->q_id);
1872
1873                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1874                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1875         }
1876         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1877                 ASSERT(ip->i_pdquot == NULL);
1878                 ASSERT(ip->i_projid == pdqp->q_id);
1879
1880                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1881                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1882         }
1883 }
1884
1885 /* Decide if this inode's dquot is near an enforcement boundary. */
1886 bool
1887 xfs_inode_near_dquot_enforcement(
1888         struct xfs_inode        *ip,
1889         xfs_dqtype_t            type)
1890 {
1891         struct xfs_dquot        *dqp;
1892         int64_t                 freesp;
1893
1894         /* We only care for quotas that are enabled and enforced. */
1895         dqp = xfs_inode_dquot(ip, type);
1896         if (!dqp || !xfs_dquot_is_enforced(dqp))
1897                 return false;
1898
1899         if (xfs_dquot_res_over_limits(&dqp->q_ino) ||
1900             xfs_dquot_res_over_limits(&dqp->q_rtb))
1901                 return true;
1902
1903         /* For space on the data device, check the various thresholds. */
1904         if (!dqp->q_prealloc_hi_wmark)
1905                 return false;
1906
1907         if (dqp->q_blk.reserved < dqp->q_prealloc_lo_wmark)
1908                 return false;
1909
1910         if (dqp->q_blk.reserved >= dqp->q_prealloc_hi_wmark)
1911                 return true;
1912
1913         freesp = dqp->q_prealloc_hi_wmark - dqp->q_blk.reserved;
1914         if (freesp < dqp->q_low_space[XFS_QLOWSP_5_PCNT])
1915                 return true;
1916
1917         return false;
1918 }