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;
  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          * If something else is freeing this dquot and hasn't yet removed it
 427          * from the LRU, leave it for the freeing task to complete the freeing
 428          * process rather than risk it being free from under us here.
 429          */
 430         if (dqp->q_flags & XFS_DQFLAG_FREEING)
 431                 goto out_miss_unlock;
 432
 433         /*
 434          * This dquot has acquired a reference in the meantime remove it from
 435          * the freelist and try again.
 436          */
 437         if (dqp->q_nrefs) {
 438                 xfs_dqunlock(dqp);
 439                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 440
 441                 trace_xfs_dqreclaim_want(dqp);
 442                 list_lru_isolate(lru, &dqp->q_lru);
 443                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 444                 return LRU_REMOVED;
 445         }
 446
 447         /*
 448          * If the dquot is dirty, flush it. If it's already being flushed, just
 449          * skip it so there is time for the IO to complete before we try to
 450          * reclaim it again on the next LRU pass.
 451          */
 452         if (!xfs_dqflock_nowait(dqp))
 453                 goto out_miss_unlock;
 454
 455         if (XFS_DQ_IS_DIRTY(dqp)) {
 456                 struct xfs_buf  *bp = NULL;
 457                 int             error;
 458
 459                 trace_xfs_dqreclaim_dirty(dqp);
 460
 461                 /* we have to drop the LRU lock to flush the dquot */
 462                 spin_unlock(lru_lock);
 463
 464                 error = xfs_qm_dqflush(dqp, &bp);
 465                 if (error)
 466                         goto out_unlock_dirty;
 467
 468                 xfs_buf_delwri_queue(bp, &isol->buffers);
 469                 xfs_buf_relse(bp);
 470                 goto out_unlock_dirty;
 471         }
 472         xfs_dqfunlock(dqp);
 473
 474         /*
 475          * Prevent lookups now that we are past the point of no return.
 476          */
 477         dqp->q_flags |= XFS_DQFLAG_FREEING;
 478         xfs_dqunlock(dqp);
 479
 480         ASSERT(dqp->q_nrefs == 0);
 481         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 482         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 483         trace_xfs_dqreclaim_done(dqp);
 484         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 485         return LRU_REMOVED;
 486
 487 out_miss_unlock:
 488         xfs_dqunlock(dqp);
 489 out_miss_busy:
 490         trace_xfs_dqreclaim_busy(dqp);
 491         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 492         return LRU_SKIP;
 493
 494 out_unlock_dirty:
 495         trace_xfs_dqreclaim_busy(dqp);
 496         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 497         xfs_dqunlock(dqp);
 498         spin_lock(lru_lock);
 499         return LRU_RETRY;
 500 }
 501
 502 static unsigned long
 503 xfs_qm_shrink_scan(
 504         struct shrinker         *shrink,
 505         struct shrink_control   *sc)
 506 {
 507         struct xfs_quotainfo    *qi = container_of(shrink,
 508                                         struct xfs_quotainfo, qi_shrinker);
 509         struct xfs_qm_isolate   isol;
 510         unsigned long           freed;
 511         int                     error;
 512
 513         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 514                 return 0;
 515
 516         INIT_LIST_HEAD(&isol.buffers);
 517         INIT_LIST_HEAD(&isol.dispose);
 518
 519         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 520                                      xfs_qm_dquot_isolate, &isol);
 521
 522         error = xfs_buf_delwri_submit(&isol.buffers);
 523         if (error)
 524                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 525
 526         while (!list_empty(&isol.dispose)) {
 527                 struct xfs_dquot        *dqp;
 528
 529                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 530                 list_del_init(&dqp->q_lru);
 531                 xfs_qm_dqfree_one(dqp);
 532         }
 533
 534         return freed;
 535 }
 536
 537 static unsigned long
 538 xfs_qm_shrink_count(
 539         struct shrinker         *shrink,
 540         struct shrink_control   *sc)
 541 {
 542         struct xfs_quotainfo    *qi = container_of(shrink,
 543                                         struct xfs_quotainfo, qi_shrinker);
 544
 545         return list_lru_shrink_count(&qi->qi_lru, sc);
 546 }
 547
 548 STATIC void
 549 xfs_qm_set_defquota(
 550         struct xfs_mount        *mp,
 551         xfs_dqtype_t            type,
 552         struct xfs_quotainfo    *qinf)
 553 {
 554         struct xfs_dquot        *dqp;
 555         struct xfs_def_quota    *defq;
 556         int                     error;
 557
 558         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 559         if (error)
 560                 return;
 561
 562         defq = xfs_get_defquota(qinf, xfs_dquot_type(dqp));
 563
 564         /*
 565          * Timers and warnings have been already set, let's just set the
 566          * default limits for this quota type
 567          */
 568         defq->blk.hard = dqp->q_blk.hardlimit;
 569         defq->blk.soft = dqp->q_blk.softlimit;
 570         defq->ino.hard = dqp->q_ino.hardlimit;
 571         defq->ino.soft = dqp->q_ino.softlimit;
 572         defq->rtb.hard = dqp->q_rtb.hardlimit;
 573         defq->rtb.soft = dqp->q_rtb.softlimit;
 574         xfs_qm_dqdestroy(dqp);
 575 }
 576
 577 /* Initialize quota time limits from the root dquot. */
 578 static void
 579 xfs_qm_init_timelimits(
 580         struct xfs_mount        *mp,
 581         xfs_dqtype_t            type)
 582 {
 583         struct xfs_quotainfo    *qinf = mp->m_quotainfo;
 584         struct xfs_def_quota    *defq;
 585         struct xfs_dquot        *dqp;
 586         int                     error;
 587
 588         defq = xfs_get_defquota(qinf, type);
 589
 590         defq->blk.time = XFS_QM_BTIMELIMIT;
 591         defq->ino.time = XFS_QM_ITIMELIMIT;
 592         defq->rtb.time = XFS_QM_RTBTIMELIMIT;
 593
 594         /*
 595          * We try to get the limits from the superuser's limits fields.
 596          * This is quite hacky, but it is standard quota practice.
 597          *
 598          * Since we may not have done a quotacheck by this point, just read
 599          * the dquot without attaching it to any hashtables or lists.
 600          */
 601         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 602         if (error)
 603                 return;
 604
 605         /*
 606          * The warnings and timers set the grace period given to
 607          * a user or group before he or she can not perform any
 608          * more writing. If it is zero, a default is used.
 609          */
 610         if (dqp->q_blk.timer)
 611                 defq->blk.time = dqp->q_blk.timer;
 612         if (dqp->q_ino.timer)
 613                 defq->ino.time = dqp->q_ino.timer;
 614         if (dqp->q_rtb.timer)
 615                 defq->rtb.time = dqp->q_rtb.timer;
 616
 617         xfs_qm_dqdestroy(dqp);
 618 }
 619
 620 /*
 621  * This initializes all the quota information that's kept in the
 622  * mount structure
 623  */
 624 STATIC int
 625 xfs_qm_init_quotainfo(
 626         struct xfs_mount        *mp)
 627 {
 628         struct xfs_quotainfo    *qinf;
 629         int                     error;
 630
 631         ASSERT(XFS_IS_QUOTA_ON(mp));
 632
 633         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
 634
 635         error = list_lru_init(&qinf->qi_lru);
 636         if (error)
 637                 goto out_free_qinf;
 638
 639         /*
 640          * See if quotainodes are setup, and if not, allocate them,
 641          * and change the superblock accordingly.
 642          */
 643         error = xfs_qm_init_quotainos(mp);
 644         if (error)
 645                 goto out_free_lru;
 646
 647         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 648         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 649         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 650         mutex_init(&qinf->qi_tree_lock);
 651
 652         /* mutex used to serialize quotaoffs */
 653         mutex_init(&qinf->qi_quotaofflock);
 654
 655         /* Precalc some constants */
 656         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 657         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 658         if (xfs_has_bigtime(mp)) {
 659                 qinf->qi_expiry_min =
 660                         xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MIN);
 661                 qinf->qi_expiry_max =
 662                         xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MAX);
 663         } else {
 664                 qinf->qi_expiry_min = XFS_DQ_LEGACY_EXPIRY_MIN;
 665                 qinf->qi_expiry_max = XFS_DQ_LEGACY_EXPIRY_MAX;
 666         }
 667         trace_xfs_quota_expiry_range(mp, qinf->qi_expiry_min,
 668                         qinf->qi_expiry_max);
 669
 670         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 671
 672         xfs_qm_init_timelimits(mp, XFS_DQTYPE_USER);
 673         xfs_qm_init_timelimits(mp, XFS_DQTYPE_GROUP);
 674         xfs_qm_init_timelimits(mp, XFS_DQTYPE_PROJ);
 675
 676         if (XFS_IS_UQUOTA_ON(mp))
 677                 xfs_qm_set_defquota(mp, XFS_DQTYPE_USER, qinf);
 678         if (XFS_IS_GQUOTA_ON(mp))
 679                 xfs_qm_set_defquota(mp, XFS_DQTYPE_GROUP, qinf);
 680         if (XFS_IS_PQUOTA_ON(mp))
 681                 xfs_qm_set_defquota(mp, XFS_DQTYPE_PROJ, qinf);
 682
 683         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 684         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 685         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 686         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 687
 688         error = register_shrinker(&qinf->qi_shrinker, "xfs-qm:%s",
 689                                   mp->m_super->s_id);
 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(&nop_mnt_idmap, 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(struct xfs_dqblk);
 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         /*
1164          * Reload the incore unlinked list to avoid failure in inodegc.
1165          * Use an unlocked check here because unrecovered unlinked inodes
1166          * should be somewhat rare.
1167          */
1168         if (xfs_inode_unlinked_incomplete(ip)) {
1169                 error = xfs_inode_reload_unlinked(ip);
1170                 if (error) {
1171                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1172                         goto error0;
1173                 }
1174         }
1175
1176         ASSERT(ip->i_delayed_blks == 0);
1177
1178         if (XFS_IS_REALTIME_INODE(ip)) {
1179                 struct xfs_ifork        *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
1180
1181                 error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1182                 if (error)
1183                         goto error0;
1184
1185                 xfs_bmap_count_leaves(ifp, &rtblks);
1186         }
1187
1188         nblks = (xfs_qcnt_t)ip->i_nblocks - rtblks;
1189         xfs_iflags_clear(ip, XFS_IQUOTAUNCHECKED);
1190
1191         /*
1192          * Add the (disk blocks and inode) resources occupied by this
1193          * inode to its dquots. We do this adjustment in the incore dquot,
1194          * and also copy the changes to its buffer.
1195          * We don't care about putting these changes in a transaction
1196          * envelope because if we crash in the middle of a 'quotacheck'
1197          * we have to start from the beginning anyway.
1198          * Once we're done, we'll log all the dquot bufs.
1199          *
1200          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1201          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1202          */
1203         if (XFS_IS_UQUOTA_ON(mp)) {
1204                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_USER, nblks,
1205                                 rtblks);
1206                 if (error)
1207                         goto error0;
1208         }
1209
1210         if (XFS_IS_GQUOTA_ON(mp)) {
1211                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_GROUP, nblks,
1212                                 rtblks);
1213                 if (error)
1214                         goto error0;
1215         }
1216
1217         if (XFS_IS_PQUOTA_ON(mp)) {
1218                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_PROJ, nblks,
1219                                 rtblks);
1220                 if (error)
1221                         goto error0;
1222         }
1223
1224 error0:
1225         xfs_irele(ip);
1226         return error;
1227 }
1228
1229 STATIC int
1230 xfs_qm_flush_one(
1231         struct xfs_dquot        *dqp,
1232         void                    *data)
1233 {
1234         struct xfs_mount        *mp = dqp->q_mount;
1235         struct list_head        *buffer_list = data;
1236         struct xfs_buf          *bp = NULL;
1237         int                     error = 0;
1238
1239         xfs_dqlock(dqp);
1240         if (dqp->q_flags & XFS_DQFLAG_FREEING)
1241                 goto out_unlock;
1242         if (!XFS_DQ_IS_DIRTY(dqp))
1243                 goto out_unlock;
1244
1245         /*
1246          * The only way the dquot is already flush locked by the time quotacheck
1247          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1248          * it for the final time. Quotacheck collects all dquot bufs in the
1249          * local delwri queue before dquots are dirtied, so reclaim can't have
1250          * possibly queued it for I/O. The only way out is to push the buffer to
1251          * cycle the flush lock.
1252          */
1253         if (!xfs_dqflock_nowait(dqp)) {
1254                 /* buf is pinned in-core by delwri list */
1255                 error = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1256                                 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1257                 if (error)
1258                         goto out_unlock;
1259
1260                 if (!(bp->b_flags & _XBF_DELWRI_Q)) {
1261                         error = -EAGAIN;
1262                         xfs_buf_relse(bp);
1263                         goto out_unlock;
1264                 }
1265                 xfs_buf_unlock(bp);
1266
1267                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1268                 xfs_buf_rele(bp);
1269
1270                 error = -EAGAIN;
1271                 goto out_unlock;
1272         }
1273
1274         error = xfs_qm_dqflush(dqp, &bp);
1275         if (error)
1276                 goto out_unlock;
1277
1278         xfs_buf_delwri_queue(bp, buffer_list);
1279         xfs_buf_relse(bp);
1280 out_unlock:
1281         xfs_dqunlock(dqp);
1282         return error;
1283 }
1284
1285 /*
1286  * Walk thru all the filesystem inodes and construct a consistent view
1287  * of the disk quota world. If the quotacheck fails, disable quotas.
1288  */
1289 STATIC int
1290 xfs_qm_quotacheck(
1291         xfs_mount_t     *mp)
1292 {
1293         int                     error, error2;
1294         uint                    flags;
1295         LIST_HEAD               (buffer_list);
1296         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1297         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1298         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1299
1300         flags = 0;
1301
1302         ASSERT(uip || gip || pip);
1303         ASSERT(XFS_IS_QUOTA_ON(mp));
1304
1305         xfs_notice(mp, "Quotacheck needed: Please wait.");
1306
1307         /*
1308          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1309          * their counters to zero. We need a clean slate.
1310          * We don't log our changes till later.
1311          */
1312         if (uip) {
1313                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_DQTYPE_USER,
1314                                          &buffer_list);
1315                 if (error)
1316                         goto error_return;
1317                 flags |= XFS_UQUOTA_CHKD;
1318         }
1319
1320         if (gip) {
1321                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_DQTYPE_GROUP,
1322                                          &buffer_list);
1323                 if (error)
1324                         goto error_return;
1325                 flags |= XFS_GQUOTA_CHKD;
1326         }
1327
1328         if (pip) {
1329                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_DQTYPE_PROJ,
1330                                          &buffer_list);
1331                 if (error)
1332                         goto error_return;
1333                 flags |= XFS_PQUOTA_CHKD;
1334         }
1335
1336         xfs_set_quotacheck_running(mp);
1337         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1338                         NULL);
1339         xfs_clear_quotacheck_running(mp);
1340
1341         /*
1342          * On error, the inode walk may have partially populated the dquot
1343          * caches.  We must purge them before disabling quota and tearing down
1344          * the quotainfo, or else the dquots will leak.
1345          */
1346         if (error)
1347                 goto error_purge;
1348
1349         /*
1350          * We've made all the changes that we need to make incore.  Flush them
1351          * down to disk buffers if everything was updated successfully.
1352          */
1353         if (XFS_IS_UQUOTA_ON(mp)) {
1354                 error = xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_flush_one,
1355                                           &buffer_list);
1356         }
1357         if (XFS_IS_GQUOTA_ON(mp)) {
1358                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_flush_one,
1359                                            &buffer_list);
1360                 if (!error)
1361                         error = error2;
1362         }
1363         if (XFS_IS_PQUOTA_ON(mp)) {
1364                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_flush_one,
1365                                            &buffer_list);
1366                 if (!error)
1367                         error = error2;
1368         }
1369
1370         error2 = xfs_buf_delwri_submit(&buffer_list);
1371         if (!error)
1372                 error = error2;
1373
1374         /*
1375          * We can get this error if we couldn't do a dquot allocation inside
1376          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1377          * dirty dquots that might be cached, we just want to get rid of them
1378          * and turn quotaoff. The dquots won't be attached to any of the inodes
1379          * at this point (because we intentionally didn't in dqget_noattach).
1380          */
1381         if (error)
1382                 goto error_purge;
1383
1384         /*
1385          * If one type of quotas is off, then it will lose its
1386          * quotachecked status, since we won't be doing accounting for
1387          * that type anymore.
1388          */
1389         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1390         mp->m_qflags |= flags;
1391
1392 error_return:
1393         xfs_buf_delwri_cancel(&buffer_list);
1394
1395         if (error) {
1396                 xfs_warn(mp,
1397         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1398                         error);
1399                 /*
1400                  * We must turn off quotas.
1401                  */
1402                 ASSERT(mp->m_quotainfo != NULL);
1403                 xfs_qm_destroy_quotainfo(mp);
1404                 if (xfs_mount_reset_sbqflags(mp)) {
1405                         xfs_warn(mp,
1406                                 "Quotacheck: Failed to reset quota flags.");
1407                 }
1408         } else
1409                 xfs_notice(mp, "Quotacheck: Done.");
1410         return error;
1411
1412 error_purge:
1413         /*
1414          * On error, we may have inodes queued for inactivation. This may try
1415          * to attach dquots to the inode before running cleanup operations on
1416          * the inode and this can race with the xfs_qm_destroy_quotainfo() call
1417          * below that frees mp->m_quotainfo. To avoid this race, flush all the
1418          * pending inodegc operations before we purge the dquots from memory,
1419          * ensuring that background inactivation is idle whilst we turn off
1420          * quotas.
1421          */
1422         xfs_inodegc_flush(mp);
1423         xfs_qm_dqpurge_all(mp);
1424         goto error_return;
1425
1426 }
1427
1428 /*
1429  * This is called from xfs_mountfs to start quotas and initialize all
1430  * necessary data structures like quotainfo.  This is also responsible for
1431  * running a quotacheck as necessary.  We are guaranteed that the superblock
1432  * is consistently read in at this point.
1433  *
1434  * If we fail here, the mount will continue with quota turned off. We don't
1435  * need to inidicate success or failure at all.
1436  */
1437 void
1438 xfs_qm_mount_quotas(
1439         struct xfs_mount        *mp)
1440 {
1441         int                     error = 0;
1442         uint                    sbf;
1443
1444         /*
1445          * If quotas on realtime volumes is not supported, we disable
1446          * quotas immediately.
1447          */
1448         if (mp->m_sb.sb_rextents) {
1449                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1450                 mp->m_qflags = 0;
1451                 goto write_changes;
1452         }
1453
1454         ASSERT(XFS_IS_QUOTA_ON(mp));
1455
1456         /*
1457          * Allocate the quotainfo structure inside the mount struct, and
1458          * create quotainode(s), and change/rev superblock if necessary.
1459          */
1460         error = xfs_qm_init_quotainfo(mp);
1461         if (error) {
1462                 /*
1463                  * We must turn off quotas.
1464                  */
1465                 ASSERT(mp->m_quotainfo == NULL);
1466                 mp->m_qflags = 0;
1467                 goto write_changes;
1468         }
1469         /*
1470          * If any of the quotas are not consistent, do a quotacheck.
1471          */
1472         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1473                 error = xfs_qm_quotacheck(mp);
1474                 if (error) {
1475                         /* Quotacheck failed and disabled quotas. */
1476                         return;
1477                 }
1478         }
1479         /*
1480          * If one type of quotas is off, then it will lose its
1481          * quotachecked status, since we won't be doing accounting for
1482          * that type anymore.
1483          */
1484         if (!XFS_IS_UQUOTA_ON(mp))
1485                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1486         if (!XFS_IS_GQUOTA_ON(mp))
1487                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1488         if (!XFS_IS_PQUOTA_ON(mp))
1489                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1490
1491  write_changes:
1492         /*
1493          * We actually don't have to acquire the m_sb_lock at all.
1494          * This can only be called from mount, and that's single threaded. XXX
1495          */
1496         spin_lock(&mp->m_sb_lock);
1497         sbf = mp->m_sb.sb_qflags;
1498         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1499         spin_unlock(&mp->m_sb_lock);
1500
1501         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1502                 if (xfs_sync_sb(mp, false)) {
1503                         /*
1504                          * We could only have been turning quotas off.
1505                          * We aren't in very good shape actually because
1506                          * the incore structures are convinced that quotas are
1507                          * off, but the on disk superblock doesn't know that !
1508                          */
1509                         ASSERT(!(XFS_IS_QUOTA_ON(mp)));
1510                         xfs_alert(mp, "%s: Superblock update failed!",
1511                                 __func__);
1512                 }
1513         }
1514
1515         if (error) {
1516                 xfs_warn(mp, "Failed to initialize disk quotas.");
1517                 return;
1518         }
1519 }
1520
1521 /*
1522  * This is called after the superblock has been read in and we're ready to
1523  * iget the quota inodes.
1524  */
1525 STATIC int
1526 xfs_qm_init_quotainos(
1527         xfs_mount_t     *mp)
1528 {
1529         struct xfs_inode        *uip = NULL;
1530         struct xfs_inode        *gip = NULL;
1531         struct xfs_inode        *pip = NULL;
1532         int                     error;
1533         uint                    flags = 0;
1534
1535         ASSERT(mp->m_quotainfo);
1536
1537         /*
1538          * Get the uquota and gquota inodes
1539          */
1540         if (xfs_has_quota(mp)) {
1541                 if (XFS_IS_UQUOTA_ON(mp) &&
1542                     mp->m_sb.sb_uquotino != NULLFSINO) {
1543                         ASSERT(mp->m_sb.sb_uquotino > 0);
1544                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1545                                              0, 0, &uip);
1546                         if (error)
1547                                 return error;
1548                 }
1549                 if (XFS_IS_GQUOTA_ON(mp) &&
1550                     mp->m_sb.sb_gquotino != NULLFSINO) {
1551                         ASSERT(mp->m_sb.sb_gquotino > 0);
1552                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1553                                              0, 0, &gip);
1554                         if (error)
1555                                 goto error_rele;
1556                 }
1557                 if (XFS_IS_PQUOTA_ON(mp) &&
1558                     mp->m_sb.sb_pquotino != NULLFSINO) {
1559                         ASSERT(mp->m_sb.sb_pquotino > 0);
1560                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1561                                              0, 0, &pip);
1562                         if (error)
1563                                 goto error_rele;
1564                 }
1565         } else {
1566                 flags |= XFS_QMOPT_SBVERSION;
1567         }
1568
1569         /*
1570          * Create the three inodes, if they don't exist already. The changes
1571          * made above will get added to a transaction and logged in one of
1572          * the qino_alloc calls below.  If the device is readonly,
1573          * temporarily switch to read-write to do this.
1574          */
1575         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1576                 error = xfs_qm_qino_alloc(mp, &uip,
1577                                               flags | XFS_QMOPT_UQUOTA);
1578                 if (error)
1579                         goto error_rele;
1580
1581                 flags &= ~XFS_QMOPT_SBVERSION;
1582         }
1583         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1584                 error = xfs_qm_qino_alloc(mp, &gip,
1585                                           flags | XFS_QMOPT_GQUOTA);
1586                 if (error)
1587                         goto error_rele;
1588
1589                 flags &= ~XFS_QMOPT_SBVERSION;
1590         }
1591         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1592                 error = xfs_qm_qino_alloc(mp, &pip,
1593                                           flags | XFS_QMOPT_PQUOTA);
1594                 if (error)
1595                         goto error_rele;
1596         }
1597
1598         mp->m_quotainfo->qi_uquotaip = uip;
1599         mp->m_quotainfo->qi_gquotaip = gip;
1600         mp->m_quotainfo->qi_pquotaip = pip;
1601
1602         return 0;
1603
1604 error_rele:
1605         if (uip)
1606                 xfs_irele(uip);
1607         if (gip)
1608                 xfs_irele(gip);
1609         if (pip)
1610                 xfs_irele(pip);
1611         return error;
1612 }
1613
1614 STATIC void
1615 xfs_qm_destroy_quotainos(
1616         struct xfs_quotainfo    *qi)
1617 {
1618         if (qi->qi_uquotaip) {
1619                 xfs_irele(qi->qi_uquotaip);
1620                 qi->qi_uquotaip = NULL; /* paranoia */
1621         }
1622         if (qi->qi_gquotaip) {
1623                 xfs_irele(qi->qi_gquotaip);
1624                 qi->qi_gquotaip = NULL;
1625         }
1626         if (qi->qi_pquotaip) {
1627                 xfs_irele(qi->qi_pquotaip);
1628                 qi->qi_pquotaip = NULL;
1629         }
1630 }
1631
1632 STATIC void
1633 xfs_qm_dqfree_one(
1634         struct xfs_dquot        *dqp)
1635 {
1636         struct xfs_mount        *mp = dqp->q_mount;
1637         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1638
1639         mutex_lock(&qi->qi_tree_lock);
1640         radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
1641
1642         qi->qi_dquots--;
1643         mutex_unlock(&qi->qi_tree_lock);
1644
1645         xfs_qm_dqdestroy(dqp);
1646 }
1647
1648 /* --------------- utility functions for vnodeops ---------------- */
1649
1650
1651 /*
1652  * Given an inode, a uid, gid and prid make sure that we have
1653  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1654  * quotas by creating this file.
1655  * This also attaches dquot(s) to the given inode after locking it,
1656  * and returns the dquots corresponding to the uid and/or gid.
1657  *
1658  * in   : inode (unlocked)
1659  * out  : udquot, gdquot with references taken and unlocked
1660  */
1661 int
1662 xfs_qm_vop_dqalloc(
1663         struct xfs_inode        *ip,
1664         kuid_t                  uid,
1665         kgid_t                  gid,
1666         prid_t                  prid,
1667         uint                    flags,
1668         struct xfs_dquot        **O_udqpp,
1669         struct xfs_dquot        **O_gdqpp,
1670         struct xfs_dquot        **O_pdqpp)
1671 {
1672         struct xfs_mount        *mp = ip->i_mount;
1673         struct inode            *inode = VFS_I(ip);
1674         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1675         struct xfs_dquot        *uq = NULL;
1676         struct xfs_dquot        *gq = NULL;
1677         struct xfs_dquot        *pq = NULL;
1678         int                     error;
1679         uint                    lockflags;
1680
1681         if (!XFS_IS_QUOTA_ON(mp))
1682                 return 0;
1683
1684         lockflags = XFS_ILOCK_EXCL;
1685         xfs_ilock(ip, lockflags);
1686
1687         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1688                 gid = inode->i_gid;
1689
1690         /*
1691          * Attach the dquot(s) to this inode, doing a dquot allocation
1692          * if necessary. The dquot(s) will not be locked.
1693          */
1694         if (XFS_NOT_DQATTACHED(mp, ip)) {
1695                 error = xfs_qm_dqattach_locked(ip, true);
1696                 if (error) {
1697                         xfs_iunlock(ip, lockflags);
1698                         return error;
1699                 }
1700         }
1701
1702         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1703                 ASSERT(O_udqpp);
1704                 if (!uid_eq(inode->i_uid, uid)) {
1705                         /*
1706                          * What we need is the dquot that has this uid, and
1707                          * if we send the inode to dqget, the uid of the inode
1708                          * takes priority over what's sent in the uid argument.
1709                          * We must unlock inode here before calling dqget if
1710                          * we're not sending the inode, because otherwise
1711                          * we'll deadlock by doing trans_reserve while
1712                          * holding ilock.
1713                          */
1714                         xfs_iunlock(ip, lockflags);
1715                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1716                                         XFS_DQTYPE_USER, true, &uq);
1717                         if (error) {
1718                                 ASSERT(error != -ENOENT);
1719                                 return error;
1720                         }
1721                         /*
1722                          * Get the ilock in the right order.
1723                          */
1724                         xfs_dqunlock(uq);
1725                         lockflags = XFS_ILOCK_SHARED;
1726                         xfs_ilock(ip, lockflags);
1727                 } else {
1728                         /*
1729                          * Take an extra reference, because we'll return
1730                          * this to caller
1731                          */
1732                         ASSERT(ip->i_udquot);
1733                         uq = xfs_qm_dqhold(ip->i_udquot);
1734                 }
1735         }
1736         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1737                 ASSERT(O_gdqpp);
1738                 if (!gid_eq(inode->i_gid, gid)) {
1739                         xfs_iunlock(ip, lockflags);
1740                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1741                                         XFS_DQTYPE_GROUP, true, &gq);
1742                         if (error) {
1743                                 ASSERT(error != -ENOENT);
1744                                 goto error_rele;
1745                         }
1746                         xfs_dqunlock(gq);
1747                         lockflags = XFS_ILOCK_SHARED;
1748                         xfs_ilock(ip, lockflags);
1749                 } else {
1750                         ASSERT(ip->i_gdquot);
1751                         gq = xfs_qm_dqhold(ip->i_gdquot);
1752                 }
1753         }
1754         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1755                 ASSERT(O_pdqpp);
1756                 if (ip->i_projid != prid) {
1757                         xfs_iunlock(ip, lockflags);
1758                         error = xfs_qm_dqget(mp, prid,
1759                                         XFS_DQTYPE_PROJ, true, &pq);
1760                         if (error) {
1761                                 ASSERT(error != -ENOENT);
1762                                 goto error_rele;
1763                         }
1764                         xfs_dqunlock(pq);
1765                         lockflags = XFS_ILOCK_SHARED;
1766                         xfs_ilock(ip, lockflags);
1767                 } else {
1768                         ASSERT(ip->i_pdquot);
1769                         pq = xfs_qm_dqhold(ip->i_pdquot);
1770                 }
1771         }
1772         trace_xfs_dquot_dqalloc(ip);
1773
1774         xfs_iunlock(ip, lockflags);
1775         if (O_udqpp)
1776                 *O_udqpp = uq;
1777         else
1778                 xfs_qm_dqrele(uq);
1779         if (O_gdqpp)
1780                 *O_gdqpp = gq;
1781         else
1782                 xfs_qm_dqrele(gq);
1783         if (O_pdqpp)
1784                 *O_pdqpp = pq;
1785         else
1786                 xfs_qm_dqrele(pq);
1787         return 0;
1788
1789 error_rele:
1790         xfs_qm_dqrele(gq);
1791         xfs_qm_dqrele(uq);
1792         return error;
1793 }
1794
1795 /*
1796  * Actually transfer ownership, and do dquot modifications.
1797  * These were already reserved.
1798  */
1799 struct xfs_dquot *
1800 xfs_qm_vop_chown(
1801         struct xfs_trans        *tp,
1802         struct xfs_inode        *ip,
1803         struct xfs_dquot        **IO_olddq,
1804         struct xfs_dquot        *newdq)
1805 {
1806         struct xfs_dquot        *prevdq;
1807         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1808                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1809
1810
1811         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1812         ASSERT(XFS_IS_QUOTA_ON(ip->i_mount));
1813
1814         /* old dquot */
1815         prevdq = *IO_olddq;
1816         ASSERT(prevdq);
1817         ASSERT(prevdq != newdq);
1818
1819         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_nblocks));
1820         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1821
1822         /* the sparkling new dquot */
1823         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_nblocks);
1824         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1825
1826         /*
1827          * Back when we made quota reservations for the chown, we reserved the
1828          * ondisk blocks + delalloc blocks with the new dquot.  Now that we've
1829          * switched the dquots, decrease the new dquot's block reservation
1830          * (having already bumped up the real counter) so that we don't have
1831          * any reservation to give back when we commit.
1832          */
1833         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_RES_BLKS,
1834                         -ip->i_delayed_blks);
1835
1836         /*
1837          * Give the incore reservation for delalloc blocks back to the old
1838          * dquot.  We don't normally handle delalloc quota reservations
1839          * transactionally, so just lock the dquot and subtract from the
1840          * reservation.  Dirty the transaction because it's too late to turn
1841          * back now.
1842          */
1843         tp->t_flags |= XFS_TRANS_DIRTY;
1844         xfs_dqlock(prevdq);
1845         ASSERT(prevdq->q_blk.reserved >= ip->i_delayed_blks);
1846         prevdq->q_blk.reserved -= ip->i_delayed_blks;
1847         xfs_dqunlock(prevdq);
1848
1849         /*
1850          * Take an extra reference, because the inode is going to keep
1851          * this dquot pointer even after the trans_commit.
1852          */
1853         *IO_olddq = xfs_qm_dqhold(newdq);
1854
1855         return prevdq;
1856 }
1857
1858 int
1859 xfs_qm_vop_rename_dqattach(
1860         struct xfs_inode        **i_tab)
1861 {
1862         struct xfs_mount        *mp = i_tab[0]->i_mount;
1863         int                     i;
1864
1865         if (!XFS_IS_QUOTA_ON(mp))
1866                 return 0;
1867
1868         for (i = 0; (i < 4 && i_tab[i]); i++) {
1869                 struct xfs_inode        *ip = i_tab[i];
1870                 int                     error;
1871
1872                 /*
1873                  * Watch out for duplicate entries in the table.
1874                  */
1875                 if (i == 0 || ip != i_tab[i-1]) {
1876                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1877                                 error = xfs_qm_dqattach(ip);
1878                                 if (error)
1879                                         return error;
1880                         }
1881                 }
1882         }
1883         return 0;
1884 }
1885
1886 void
1887 xfs_qm_vop_create_dqattach(
1888         struct xfs_trans        *tp,
1889         struct xfs_inode        *ip,
1890         struct xfs_dquot        *udqp,
1891         struct xfs_dquot        *gdqp,
1892         struct xfs_dquot        *pdqp)
1893 {
1894         struct xfs_mount        *mp = tp->t_mountp;
1895
1896         if (!XFS_IS_QUOTA_ON(mp))
1897                 return;
1898
1899         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1900
1901         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1902                 ASSERT(ip->i_udquot == NULL);
1903                 ASSERT(i_uid_read(VFS_I(ip)) == udqp->q_id);
1904
1905                 ip->i_udquot = xfs_qm_dqhold(udqp);
1906                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1907         }
1908         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1909                 ASSERT(ip->i_gdquot == NULL);
1910                 ASSERT(i_gid_read(VFS_I(ip)) == gdqp->q_id);
1911
1912                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1913                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1914         }
1915         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1916                 ASSERT(ip->i_pdquot == NULL);
1917                 ASSERT(ip->i_projid == pdqp->q_id);
1918
1919                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1920                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1921         }
1922 }
1923
1924 /* Decide if this inode's dquot is near an enforcement boundary. */
1925 bool
1926 xfs_inode_near_dquot_enforcement(
1927         struct xfs_inode        *ip,
1928         xfs_dqtype_t            type)
1929 {
1930         struct xfs_dquot        *dqp;
1931         int64_t                 freesp;
1932
1933         /* We only care for quotas that are enabled and enforced. */
1934         dqp = xfs_inode_dquot(ip, type);
1935         if (!dqp || !xfs_dquot_is_enforced(dqp))
1936                 return false;
1937
1938         if (xfs_dquot_res_over_limits(&dqp->q_ino) ||
1939             xfs_dquot_res_over_limits(&dqp->q_rtb))
1940                 return true;
1941
1942         /* For space on the data device, check the various thresholds. */
1943         if (!dqp->q_prealloc_hi_wmark)
1944                 return false;
1945
1946         if (dqp->q_blk.reserved < dqp->q_prealloc_lo_wmark)
1947                 return false;
1948
1949         if (dqp->q_blk.reserved >= dqp->q_prealloc_hi_wmark)
1950                 return true;
1951
1952         freesp = dqp->q_prealloc_hi_wmark - dqp->q_blk.reserved;
1953         if (freesp < dqp->q_low_space[XFS_QLOWSP_5_PCNT])
1954                 return true;
1955
1956         return false;
1957 }