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