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
  27 /*
  28  * The global quota manager. There is only one of these for the entire
  29  * system, _not_ one per file system. XQM keeps track of the overall
  30  * quota functionality, including maintaining the freelist and hash
  31  * tables of dquots.
  32  */
  33 STATIC int      xfs_qm_init_quotainos(struct xfs_mount *mp);
  34 STATIC int      xfs_qm_init_quotainfo(struct xfs_mount *mp);
  35
  36 STATIC void     xfs_qm_destroy_quotainos(struct xfs_quotainfo *qi);
  37 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  38 /*
  39  * We use the batch lookup interface to iterate over the dquots as it
  40  * currently is the only interface into the radix tree code that allows
  41  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  42  * operations is fine as all callers are used either during mount/umount
  43  * or quotaoff.
  44  */
  45 #define XFS_DQ_LOOKUP_BATCH     32
  46
  47 STATIC int
  48 xfs_qm_dquot_walk(
  49         struct xfs_mount        *mp,
  50         int                     type,
  51         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  52         void                    *data)
  53 {
  54         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  55         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  56         uint32_t                next_index;
  57         int                     last_error = 0;
  58         int                     skipped;
  59         int                     nr_found;
  60
  61 restart:
  62         skipped = 0;
  63         next_index = 0;
  64         nr_found = 0;
  65
  66         while (1) {
  67                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  68                 int             error = 0;
  69                 int             i;
  70
  71                 mutex_lock(&qi->qi_tree_lock);
  72                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  73                                         next_index, XFS_DQ_LOOKUP_BATCH);
  74                 if (!nr_found) {
  75                         mutex_unlock(&qi->qi_tree_lock);
  76                         break;
  77                 }
  78
  79                 for (i = 0; i < nr_found; i++) {
  80                         struct xfs_dquot *dqp = batch[i];
  81
  82                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  83
  84                         error = execute(batch[i], data);
  85                         if (error == -EAGAIN) {
  86                                 skipped++;
  87                                 continue;
  88                         }
  89                         if (error && last_error != -EFSCORRUPTED)
  90                                 last_error = error;
  91                 }
  92
  93                 mutex_unlock(&qi->qi_tree_lock);
  94
  95                 /* bail out if the filesystem is corrupted.  */
  96                 if (last_error == -EFSCORRUPTED) {
  97                         skipped = 0;
  98                         break;
  99                 }
 100                 /* we're done if id overflows back to zero */
 101                 if (!next_index)
 102                         break;
 103         }
 104
 105         if (skipped) {
 106                 delay(1);
 107                 goto restart;
 108         }
 109
 110         return last_error;
 111 }
 112
 113
 114 /*
 115  * Purge a dquot from all tracking data structures and free it.
 116  */
 117 STATIC int
 118 xfs_qm_dqpurge(
 119         struct xfs_dquot        *dqp,
 120         void                    *data)
 121 {
 122         struct xfs_mount        *mp = dqp->q_mount;
 123         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 124         int                     error = -EAGAIN;
 125
 126         xfs_dqlock(dqp);
 127         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0)
 128                 goto out_unlock;
 129
 130         dqp->dq_flags |= XFS_DQ_FREEING;
 131
 132         xfs_dqflock(dqp);
 133
 134         /*
 135          * If we are turning this type of quotas off, we don't care
 136          * about the dirty metadata sitting in this dquot. OTOH, if
 137          * we're unmounting, we do care, so we flush it and wait.
 138          */
 139         if (XFS_DQ_IS_DIRTY(dqp)) {
 140                 struct xfs_buf  *bp = NULL;
 141
 142                 /*
 143                  * We don't care about getting disk errors here. We need
 144                  * to purge this dquot anyway, so we go ahead regardless.
 145                  */
 146                 error = xfs_qm_dqflush(dqp, &bp);
 147                 if (!error) {
 148                         error = xfs_bwrite(bp);
 149                         xfs_buf_relse(bp);
 150                 } else if (error == -EAGAIN) {
 151                         goto out_unlock;
 152                 }
 153                 xfs_dqflock(dqp);
 154         }
 155
 156         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 157         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 158                 !test_bit(XFS_LI_IN_AIL, &dqp->q_logitem.qli_item.li_flags));
 159
 160         xfs_dqfunlock(dqp);
 161         xfs_dqunlock(dqp);
 162
 163         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 164                           be32_to_cpu(dqp->q_core.d_id));
 165         qi->qi_dquots--;
 166
 167         /*
 168          * We move dquots to the freelist as soon as their reference count
 169          * hits zero, so it really should be on the freelist here.
 170          */
 171         ASSERT(!list_empty(&dqp->q_lru));
 172         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 173         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 174
 175         xfs_qm_dqdestroy(dqp);
 176         return 0;
 177
 178 out_unlock:
 179         xfs_dqunlock(dqp);
 180         return error;
 181 }
 182
 183 /*
 184  * Purge the dquot cache.
 185  */
 186 void
 187 xfs_qm_dqpurge_all(
 188         struct xfs_mount        *mp,
 189         uint                    flags)
 190 {
 191         if (flags & XFS_QMOPT_UQUOTA)
 192                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 193         if (flags & XFS_QMOPT_GQUOTA)
 194                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 195         if (flags & XFS_QMOPT_PQUOTA)
 196                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 197 }
 198
 199 /*
 200  * Just destroy the quotainfo structure.
 201  */
 202 void
 203 xfs_qm_unmount(
 204         struct xfs_mount        *mp)
 205 {
 206         if (mp->m_quotainfo) {
 207                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 208                 xfs_qm_destroy_quotainfo(mp);
 209         }
 210 }
 211
 212 /*
 213  * Called from the vfsops layer.
 214  */
 215 void
 216 xfs_qm_unmount_quotas(
 217         xfs_mount_t     *mp)
 218 {
 219         /*
 220          * Release the dquots that root inode, et al might be holding,
 221          * before we flush quotas and blow away the quotainfo structure.
 222          */
 223         ASSERT(mp->m_rootip);
 224         xfs_qm_dqdetach(mp->m_rootip);
 225         if (mp->m_rbmip)
 226                 xfs_qm_dqdetach(mp->m_rbmip);
 227         if (mp->m_rsumip)
 228                 xfs_qm_dqdetach(mp->m_rsumip);
 229
 230         /*
 231          * Release the quota inodes.
 232          */
 233         if (mp->m_quotainfo) {
 234                 if (mp->m_quotainfo->qi_uquotaip) {
 235                         xfs_irele(mp->m_quotainfo->qi_uquotaip);
 236                         mp->m_quotainfo->qi_uquotaip = NULL;
 237                 }
 238                 if (mp->m_quotainfo->qi_gquotaip) {
 239                         xfs_irele(mp->m_quotainfo->qi_gquotaip);
 240                         mp->m_quotainfo->qi_gquotaip = NULL;
 241                 }
 242                 if (mp->m_quotainfo->qi_pquotaip) {
 243                         xfs_irele(mp->m_quotainfo->qi_pquotaip);
 244                         mp->m_quotainfo->qi_pquotaip = NULL;
 245                 }
 246         }
 247 }
 248
 249 STATIC int
 250 xfs_qm_dqattach_one(
 251         struct xfs_inode        *ip,
 252         xfs_dqid_t              id,
 253         uint                    type,
 254         bool                    doalloc,
 255         struct xfs_dquot        **IO_idqpp)
 256 {
 257         struct xfs_dquot        *dqp;
 258         int                     error;
 259
 260         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 261         error = 0;
 262
 263         /*
 264          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 265          * or &i_gdquot. This made the code look weird, but made the logic a lot
 266          * simpler.
 267          */
 268         dqp = *IO_idqpp;
 269         if (dqp) {
 270                 trace_xfs_dqattach_found(dqp);
 271                 return 0;
 272         }
 273
 274         /*
 275          * Find the dquot from somewhere. This bumps the reference count of
 276          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 277          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 278          * turned off suddenly.
 279          */
 280         error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
 281         if (error)
 282                 return error;
 283
 284         trace_xfs_dqattach_get(dqp);
 285
 286         /*
 287          * dqget may have dropped and re-acquired the ilock, but it guarantees
 288          * that the dquot returned is the one that should go in the inode.
 289          */
 290         *IO_idqpp = dqp;
 291         xfs_dqunlock(dqp);
 292         return 0;
 293 }
 294
 295 static bool
 296 xfs_qm_need_dqattach(
 297         struct xfs_inode        *ip)
 298 {
 299         struct xfs_mount        *mp = ip->i_mount;
 300
 301         if (!XFS_IS_QUOTA_RUNNING(mp))
 302                 return false;
 303         if (!XFS_IS_QUOTA_ON(mp))
 304                 return false;
 305         if (!XFS_NOT_DQATTACHED(mp, ip))
 306                 return false;
 307         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 308                 return false;
 309         return true;
 310 }
 311
 312 /*
 313  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 314  * into account.
 315  * If @doalloc is true, the dquot(s) will be allocated if needed.
 316  * Inode may get unlocked and relocked in here, and the caller must deal with
 317  * the consequences.
 318  */
 319 int
 320 xfs_qm_dqattach_locked(
 321         xfs_inode_t     *ip,
 322         bool            doalloc)
 323 {
 324         xfs_mount_t     *mp = ip->i_mount;
 325         int             error = 0;
 326
 327         if (!xfs_qm_need_dqattach(ip))
 328                 return 0;
 329
 330         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 331
 332         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 333                 error = xfs_qm_dqattach_one(ip, i_uid_read(VFS_I(ip)),
 334                                 XFS_DQ_USER, doalloc, &ip->i_udquot);
 335                 if (error)
 336                         goto done;
 337                 ASSERT(ip->i_udquot);
 338         }
 339
 340         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 341                 error = xfs_qm_dqattach_one(ip, i_gid_read(VFS_I(ip)),
 342                                 XFS_DQ_GROUP, doalloc, &ip->i_gdquot);
 343                 if (error)
 344                         goto done;
 345                 ASSERT(ip->i_gdquot);
 346         }
 347
 348         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 349                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
 350                                 doalloc, &ip->i_pdquot);
 351                 if (error)
 352                         goto done;
 353                 ASSERT(ip->i_pdquot);
 354         }
 355
 356 done:
 357         /*
 358          * Don't worry about the dquots that we may have attached before any
 359          * error - they'll get detached later if it has not already been done.
 360          */
 361         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 362         return error;
 363 }
 364
 365 int
 366 xfs_qm_dqattach(
 367         struct xfs_inode        *ip)
 368 {
 369         int                     error;
 370
 371         if (!xfs_qm_need_dqattach(ip))
 372                 return 0;
 373
 374         xfs_ilock(ip, XFS_ILOCK_EXCL);
 375         error = xfs_qm_dqattach_locked(ip, false);
 376         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 377
 378         return error;
 379 }
 380
 381 /*
 382  * Release dquots (and their references) if any.
 383  * The inode should be locked EXCL except when this's called by
 384  * xfs_ireclaim.
 385  */
 386 void
 387 xfs_qm_dqdetach(
 388         xfs_inode_t     *ip)
 389 {
 390         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 391                 return;
 392
 393         trace_xfs_dquot_dqdetach(ip);
 394
 395         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 396         if (ip->i_udquot) {
 397                 xfs_qm_dqrele(ip->i_udquot);
 398                 ip->i_udquot = NULL;
 399         }
 400         if (ip->i_gdquot) {
 401                 xfs_qm_dqrele(ip->i_gdquot);
 402                 ip->i_gdquot = NULL;
 403         }
 404         if (ip->i_pdquot) {
 405                 xfs_qm_dqrele(ip->i_pdquot);
 406                 ip->i_pdquot = NULL;
 407         }
 408 }
 409
 410 struct xfs_qm_isolate {
 411         struct list_head        buffers;
 412         struct list_head        dispose;
 413 };
 414
 415 static enum lru_status
 416 xfs_qm_dquot_isolate(
 417         struct list_head        *item,
 418         struct list_lru_one     *lru,
 419         spinlock_t              *lru_lock,
 420         void                    *arg)
 421                 __releases(lru_lock) __acquires(lru_lock)
 422 {
 423         struct xfs_dquot        *dqp = container_of(item,
 424                                                 struct xfs_dquot, q_lru);
 425         struct xfs_qm_isolate   *isol = arg;
 426
 427         if (!xfs_dqlock_nowait(dqp))
 428                 goto out_miss_busy;
 429
 430         /*
 431          * This dquot has acquired a reference in the meantime remove it from
 432          * the freelist and try again.
 433          */
 434         if (dqp->q_nrefs) {
 435                 xfs_dqunlock(dqp);
 436                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 437
 438                 trace_xfs_dqreclaim_want(dqp);
 439                 list_lru_isolate(lru, &dqp->q_lru);
 440                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 441                 return LRU_REMOVED;
 442         }
 443
 444         /*
 445          * If the dquot is dirty, flush it. If it's already being flushed, just
 446          * skip it so there is time for the IO to complete before we try to
 447          * reclaim it again on the next LRU pass.
 448          */
 449         if (!xfs_dqflock_nowait(dqp)) {
 450                 xfs_dqunlock(dqp);
 451                 goto out_miss_busy;
 452         }
 453
 454         if (XFS_DQ_IS_DIRTY(dqp)) {
 455                 struct xfs_buf  *bp = NULL;
 456                 int             error;
 457
 458                 trace_xfs_dqreclaim_dirty(dqp);
 459
 460                 /* we have to drop the LRU lock to flush the dquot */
 461                 spin_unlock(lru_lock);
 462
 463                 error = xfs_qm_dqflush(dqp, &bp);
 464                 if (error)
 465                         goto out_unlock_dirty;
 466
 467                 xfs_buf_delwri_queue(bp, &isol->buffers);
 468                 xfs_buf_relse(bp);
 469                 goto out_unlock_dirty;
 470         }
 471         xfs_dqfunlock(dqp);
 472
 473         /*
 474          * Prevent lookups now that we are past the point of no return.
 475          */
 476         dqp->dq_flags |= XFS_DQ_FREEING;
 477         xfs_dqunlock(dqp);
 478
 479         ASSERT(dqp->q_nrefs == 0);
 480         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 481         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 482         trace_xfs_dqreclaim_done(dqp);
 483         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 484         return LRU_REMOVED;
 485
 486 out_miss_busy:
 487         trace_xfs_dqreclaim_busy(dqp);
 488         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 489         return LRU_SKIP;
 490
 491 out_unlock_dirty:
 492         trace_xfs_dqreclaim_busy(dqp);
 493         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 494         xfs_dqunlock(dqp);
 495         spin_lock(lru_lock);
 496         return LRU_RETRY;
 497 }
 498
 499 static unsigned long
 500 xfs_qm_shrink_scan(
 501         struct shrinker         *shrink,
 502         struct shrink_control   *sc)
 503 {
 504         struct xfs_quotainfo    *qi = container_of(shrink,
 505                                         struct xfs_quotainfo, qi_shrinker);
 506         struct xfs_qm_isolate   isol;
 507         unsigned long           freed;
 508         int                     error;
 509
 510         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 511                 return 0;
 512
 513         INIT_LIST_HEAD(&isol.buffers);
 514         INIT_LIST_HEAD(&isol.dispose);
 515
 516         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 517                                      xfs_qm_dquot_isolate, &isol);
 518
 519         error = xfs_buf_delwri_submit(&isol.buffers);
 520         if (error)
 521                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 522
 523         while (!list_empty(&isol.dispose)) {
 524                 struct xfs_dquot        *dqp;
 525
 526                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 527                 list_del_init(&dqp->q_lru);
 528                 xfs_qm_dqfree_one(dqp);
 529         }
 530
 531         return freed;
 532 }
 533
 534 static unsigned long
 535 xfs_qm_shrink_count(
 536         struct shrinker         *shrink,
 537         struct shrink_control   *sc)
 538 {
 539         struct xfs_quotainfo    *qi = container_of(shrink,
 540                                         struct xfs_quotainfo, qi_shrinker);
 541
 542         return list_lru_shrink_count(&qi->qi_lru, sc);
 543 }
 544
 545 STATIC void
 546 xfs_qm_set_defquota(
 547         struct xfs_mount        *mp,
 548         uint                    type,
 549         struct xfs_quotainfo    *qinf)
 550 {
 551         struct xfs_dquot        *dqp;
 552         struct xfs_def_quota    *defq;
 553         struct xfs_disk_dquot   *ddqp;
 554         int                     error;
 555
 556         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 557         if (error)
 558                 return;
 559
 560         ddqp = &dqp->q_core;
 561         defq = xfs_get_defquota(dqp, qinf);
 562
 563         /*
 564          * Timers and warnings have been already set, let's just set the
 565          * default limits for this quota type
 566          */
 567         defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 568         defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 569         defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 570         defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 571         defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 572         defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 573         xfs_qm_dqdestroy(dqp);
 574 }
 575
 576 /* Initialize quota time limits from the root dquot. */
 577 static void
 578 xfs_qm_init_timelimits(
 579         struct xfs_mount        *mp,
 580         struct xfs_quotainfo    *qinf)
 581 {
 582         struct xfs_disk_dquot   *ddqp;
 583         struct xfs_dquot        *dqp;
 584         uint                    type;
 585         int                     error;
 586
 587         qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 588         qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 589         qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 590         qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 591         qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 592         qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 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          * Timers and warnings are globally set by the first timer found in
 602          * user/group/proj quota types, otherwise a default value is used.
 603          * This should be split into different fields per quota type.
 604          */
 605         if (XFS_IS_UQUOTA_RUNNING(mp))
 606                 type = XFS_DQ_USER;
 607         else if (XFS_IS_GQUOTA_RUNNING(mp))
 608                 type = XFS_DQ_GROUP;
 609         else
 610                 type = XFS_DQ_PROJ;
 611         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 612         if (error)
 613                 return;
 614
 615         ddqp = &dqp->q_core;
 616         /*
 617          * The warnings and timers set the grace period given to
 618          * a user or group before he or she can not perform any
 619          * more writing. If it is zero, a default is used.
 620          */
 621         if (ddqp->d_btimer)
 622                 qinf->qi_btimelimit = be32_to_cpu(ddqp->d_btimer);
 623         if (ddqp->d_itimer)
 624                 qinf->qi_itimelimit = be32_to_cpu(ddqp->d_itimer);
 625         if (ddqp->d_rtbtimer)
 626                 qinf->qi_rtbtimelimit = be32_to_cpu(ddqp->d_rtbtimer);
 627         if (ddqp->d_bwarns)
 628                 qinf->qi_bwarnlimit = be16_to_cpu(ddqp->d_bwarns);
 629         if (ddqp->d_iwarns)
 630                 qinf->qi_iwarnlimit = be16_to_cpu(ddqp->d_iwarns);
 631         if (ddqp->d_rtbwarns)
 632                 qinf->qi_rtbwarnlimit = be16_to_cpu(ddqp->d_rtbwarns);
 633
 634         xfs_qm_dqdestroy(dqp);
 635 }
 636
 637 /*
 638  * This initializes all the quota information that's kept in the
 639  * mount structure
 640  */
 641 STATIC int
 642 xfs_qm_init_quotainfo(
 643         struct xfs_mount        *mp)
 644 {
 645         struct xfs_quotainfo    *qinf;
 646         int                     error;
 647
 648         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 649
 650         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
 651
 652         error = list_lru_init(&qinf->qi_lru);
 653         if (error)
 654                 goto out_free_qinf;
 655
 656         /*
 657          * See if quotainodes are setup, and if not, allocate them,
 658          * and change the superblock accordingly.
 659          */
 660         error = xfs_qm_init_quotainos(mp);
 661         if (error)
 662                 goto out_free_lru;
 663
 664         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 665         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 666         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 667         mutex_init(&qinf->qi_tree_lock);
 668
 669         /* mutex used to serialize quotaoffs */
 670         mutex_init(&qinf->qi_quotaofflock);
 671
 672         /* Precalc some constants */
 673         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 674         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 675
 676         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 677
 678         xfs_qm_init_timelimits(mp, qinf);
 679
 680         if (XFS_IS_UQUOTA_RUNNING(mp))
 681                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 682         if (XFS_IS_GQUOTA_RUNNING(mp))
 683                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 684         if (XFS_IS_PQUOTA_RUNNING(mp))
 685                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 686
 687         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 688         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 689         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 690         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 691
 692         error = register_shrinker(&qinf->qi_shrinker);
 693         if (error)
 694                 goto out_free_inos;
 695
 696         return 0;
 697
 698 out_free_inos:
 699         mutex_destroy(&qinf->qi_quotaofflock);
 700         mutex_destroy(&qinf->qi_tree_lock);
 701         xfs_qm_destroy_quotainos(qinf);
 702 out_free_lru:
 703         list_lru_destroy(&qinf->qi_lru);
 704 out_free_qinf:
 705         kmem_free(qinf);
 706         mp->m_quotainfo = NULL;
 707         return error;
 708 }
 709
 710 /*
 711  * Gets called when unmounting a filesystem or when all quotas get
 712  * turned off.
 713  * This purges the quota inodes, destroys locks and frees itself.
 714  */
 715 void
 716 xfs_qm_destroy_quotainfo(
 717         struct xfs_mount        *mp)
 718 {
 719         struct xfs_quotainfo    *qi;
 720
 721         qi = mp->m_quotainfo;
 722         ASSERT(qi != NULL);
 723
 724         unregister_shrinker(&qi->qi_shrinker);
 725         list_lru_destroy(&qi->qi_lru);
 726         xfs_qm_destroy_quotainos(qi);
 727         mutex_destroy(&qi->qi_tree_lock);
 728         mutex_destroy(&qi->qi_quotaofflock);
 729         kmem_free(qi);
 730         mp->m_quotainfo = NULL;
 731 }
 732
 733 /*
 734  * Create an inode and return with a reference already taken, but unlocked
 735  * This is how we create quota inodes
 736  */
 737 STATIC int
 738 xfs_qm_qino_alloc(
 739         xfs_mount_t     *mp,
 740         xfs_inode_t     **ip,
 741         uint            flags)
 742 {
 743         xfs_trans_t     *tp;
 744         int             error;
 745         bool            need_alloc = true;
 746
 747         *ip = NULL;
 748         /*
 749          * With superblock that doesn't have separate pquotino, we
 750          * share an inode between gquota and pquota. If the on-disk
 751          * superblock has GQUOTA and the filesystem is now mounted
 752          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 753          * vice-versa.
 754          */
 755         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 756                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 757                 xfs_ino_t ino = NULLFSINO;
 758
 759                 if ((flags & XFS_QMOPT_PQUOTA) &&
 760                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 761                         ino = mp->m_sb.sb_gquotino;
 762                         if (XFS_IS_CORRUPT(mp,
 763                                            mp->m_sb.sb_pquotino != NULLFSINO))
 764                                 return -EFSCORRUPTED;
 765                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 766                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 767                         ino = mp->m_sb.sb_pquotino;
 768                         if (XFS_IS_CORRUPT(mp,
 769                                            mp->m_sb.sb_gquotino != NULLFSINO))
 770                                 return -EFSCORRUPTED;
 771                 }
 772                 if (ino != NULLFSINO) {
 773                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 774                         if (error)
 775                                 return error;
 776                         mp->m_sb.sb_gquotino = NULLFSINO;
 777                         mp->m_sb.sb_pquotino = NULLFSINO;
 778                         need_alloc = false;
 779                 }
 780         }
 781
 782         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 783                         XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 784         if (error)
 785                 return error;
 786
 787         if (need_alloc) {
 788                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
 789                 if (error) {
 790                         xfs_trans_cancel(tp);
 791                         return error;
 792                 }
 793         }
 794
 795         /*
 796          * Make the changes in the superblock, and log those too.
 797          * sbfields arg may contain fields other than *QUOTINO;
 798          * VERSIONNUM for example.
 799          */
 800         spin_lock(&mp->m_sb_lock);
 801         if (flags & XFS_QMOPT_SBVERSION) {
 802                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 803
 804                 xfs_sb_version_addquota(&mp->m_sb);
 805                 mp->m_sb.sb_uquotino = NULLFSINO;
 806                 mp->m_sb.sb_gquotino = NULLFSINO;
 807                 mp->m_sb.sb_pquotino = NULLFSINO;
 808
 809                 /* qflags will get updated fully _after_ quotacheck */
 810                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 811         }
 812         if (flags & XFS_QMOPT_UQUOTA)
 813                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 814         else if (flags & XFS_QMOPT_GQUOTA)
 815                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 816         else
 817                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 818         spin_unlock(&mp->m_sb_lock);
 819         xfs_log_sb(tp);
 820
 821         error = xfs_trans_commit(tp);
 822         if (error) {
 823                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 824                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 825         }
 826         if (need_alloc)
 827                 xfs_finish_inode_setup(*ip);
 828         return error;
 829 }
 830
 831
 832 STATIC void
 833 xfs_qm_reset_dqcounts(
 834         xfs_mount_t     *mp,
 835         xfs_buf_t       *bp,
 836         xfs_dqid_t      id,
 837         uint            type)
 838 {
 839         struct xfs_dqblk        *dqb;
 840         int                     j;
 841         xfs_failaddr_t          fa;
 842
 843         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 844
 845         /*
 846          * Reset all counters and timers. They'll be
 847          * started afresh by xfs_qm_quotacheck.
 848          */
 849 #ifdef DEBUG
 850         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 851                 sizeof(xfs_dqblk_t);
 852         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 853 #endif
 854         dqb = bp->b_addr;
 855         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 856                 struct xfs_disk_dquot   *ddq;
 857
 858                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 859
 860                 /*
 861                  * Do a sanity check, and if needed, repair the dqblk. Don't
 862                  * output any warnings because it's perfectly possible to
 863                  * find uninitialised dquot blks. See comment in
 864                  * xfs_dquot_verify.
 865                  */
 866                 fa = xfs_dqblk_verify(mp, &dqb[j], id + j, type);
 867                 if (fa)
 868                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 869
 870                 /*
 871                  * Reset type in case we are reusing group quota file for
 872                  * project quotas or vice versa
 873                  */
 874                 ddq->d_flags = type;
 875                 ddq->d_bcount = 0;
 876                 ddq->d_icount = 0;
 877                 ddq->d_rtbcount = 0;
 878
 879                 /*
 880                  * dquot id 0 stores the default grace period and the maximum
 881                  * warning limit that were set by the administrator, so we
 882                  * should not reset them.
 883                  */
 884                 if (ddq->d_id != 0) {
 885                         ddq->d_btimer = 0;
 886                         ddq->d_itimer = 0;
 887                         ddq->d_rtbtimer = 0;
 888                         ddq->d_bwarns = 0;
 889                         ddq->d_iwarns = 0;
 890                         ddq->d_rtbwarns = 0;
 891                 }
 892
 893                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 894                         xfs_update_cksum((char *)&dqb[j],
 895                                          sizeof(struct xfs_dqblk),
 896                                          XFS_DQUOT_CRC_OFF);
 897                 }
 898         }
 899 }
 900
 901 STATIC int
 902 xfs_qm_reset_dqcounts_all(
 903         struct xfs_mount        *mp,
 904         xfs_dqid_t              firstid,
 905         xfs_fsblock_t           bno,
 906         xfs_filblks_t           blkcnt,
 907         uint                    flags,
 908         struct list_head        *buffer_list)
 909 {
 910         struct xfs_buf          *bp;
 911         int                     error;
 912         int                     type;
 913
 914         ASSERT(blkcnt > 0);
 915         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 916                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 917         error = 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         uint                    flags,
 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_d.di_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                                                    flags, 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         uint                    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         be64_add_cpu(&dqp->q_core.d_icount, 1);
1102         dqp->q_res_icount++;
1103         if (nblks) {
1104                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1105                 dqp->q_res_bcount += nblks;
1106         }
1107         if (rtblks) {
1108                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1109                 dqp->q_res_rtbcount += 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_core.d_id) {
1118                 xfs_qm_adjust_dqlimits(mp, dqp);
1119                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1120         }
1121
1122         dqp->dq_flags |= XFS_DQ_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_RUNNING(mp));
1145
1146         /*
1147          * rootino must have its resources accounted for, not so with the quota
1148          * inodes.
1149          */
1150         if (xfs_is_quota_inode(&mp->m_sb, ino))
1151                 return 0;
1152
1153         /*
1154          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1155          * at mount time and therefore nobody will be racing chown/chproj.
1156          */
1157         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1158         if (error == -EINVAL || error == -ENOENT)
1159                 return 0;
1160         if (error)
1161                 return error;
1162
1163         ASSERT(ip->i_delayed_blks == 0);
1164
1165         if (XFS_IS_REALTIME_INODE(ip)) {
1166                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1167
1168                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1169                         error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1170                         if (error)
1171                                 goto error0;
1172                 }
1173
1174                 xfs_bmap_count_leaves(ifp, &rtblks);
1175         }
1176
1177         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1178
1179         /*
1180          * Add the (disk blocks and inode) resources occupied by this
1181          * inode to its dquots. We do this adjustment in the incore dquot,
1182          * and also copy the changes to its buffer.
1183          * We don't care about putting these changes in a transaction
1184          * envelope because if we crash in the middle of a 'quotacheck'
1185          * we have to start from the beginning anyway.
1186          * Once we're done, we'll log all the dquot bufs.
1187          *
1188          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1189          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1190          */
1191         if (XFS_IS_UQUOTA_ON(mp)) {
1192                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_USER, nblks,
1193                                 rtblks);
1194                 if (error)
1195                         goto error0;
1196         }
1197
1198         if (XFS_IS_GQUOTA_ON(mp)) {
1199                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_GROUP, nblks,
1200                                 rtblks);
1201                 if (error)
1202                         goto error0;
1203         }
1204
1205         if (XFS_IS_PQUOTA_ON(mp)) {
1206                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_PROJ, nblks,
1207                                 rtblks);
1208                 if (error)
1209                         goto error0;
1210         }
1211
1212 error0:
1213         xfs_irele(ip);
1214         return error;
1215 }
1216
1217 STATIC int
1218 xfs_qm_flush_one(
1219         struct xfs_dquot        *dqp,
1220         void                    *data)
1221 {
1222         struct xfs_mount        *mp = dqp->q_mount;
1223         struct list_head        *buffer_list = data;
1224         struct xfs_buf          *bp = NULL;
1225         int                     error = 0;
1226
1227         xfs_dqlock(dqp);
1228         if (dqp->dq_flags & XFS_DQ_FREEING)
1229                 goto out_unlock;
1230         if (!XFS_DQ_IS_DIRTY(dqp))
1231                 goto out_unlock;
1232
1233         /*
1234          * The only way the dquot is already flush locked by the time quotacheck
1235          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1236          * it for the final time. Quotacheck collects all dquot bufs in the
1237          * local delwri queue before dquots are dirtied, so reclaim can't have
1238          * possibly queued it for I/O. The only way out is to push the buffer to
1239          * cycle the flush lock.
1240          */
1241         if (!xfs_dqflock_nowait(dqp)) {
1242                 /* buf is pinned in-core by delwri list */
1243                 bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1244                                 mp->m_quotainfo->qi_dqchunklen, 0);
1245                 if (!bp) {
1246                         error = -EINVAL;
1247                         goto out_unlock;
1248                 }
1249                 xfs_buf_unlock(bp);
1250
1251                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1252                 xfs_buf_rele(bp);
1253
1254                 error = -EAGAIN;
1255                 goto out_unlock;
1256         }
1257
1258         error = xfs_qm_dqflush(dqp, &bp);
1259         if (error)
1260                 goto out_unlock;
1261
1262         xfs_buf_delwri_queue(bp, buffer_list);
1263         xfs_buf_relse(bp);
1264 out_unlock:
1265         xfs_dqunlock(dqp);
1266         return error;
1267 }
1268
1269 /*
1270  * Walk thru all the filesystem inodes and construct a consistent view
1271  * of the disk quota world. If the quotacheck fails, disable quotas.
1272  */
1273 STATIC int
1274 xfs_qm_quotacheck(
1275         xfs_mount_t     *mp)
1276 {
1277         int                     error, error2;
1278         uint                    flags;
1279         LIST_HEAD               (buffer_list);
1280         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1281         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1282         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1283
1284         flags = 0;
1285
1286         ASSERT(uip || gip || pip);
1287         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1288
1289         xfs_notice(mp, "Quotacheck needed: Please wait.");
1290
1291         /*
1292          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1293          * their counters to zero. We need a clean slate.
1294          * We don't log our changes till later.
1295          */
1296         if (uip) {
1297                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_QMOPT_UQUOTA,
1298                                          &buffer_list);
1299                 if (error)
1300                         goto error_return;
1301                 flags |= XFS_UQUOTA_CHKD;
1302         }
1303
1304         if (gip) {
1305                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_QMOPT_GQUOTA,
1306                                          &buffer_list);
1307                 if (error)
1308                         goto error_return;
1309                 flags |= XFS_GQUOTA_CHKD;
1310         }
1311
1312         if (pip) {
1313                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_QMOPT_PQUOTA,
1314                                          &buffer_list);
1315                 if (error)
1316                         goto error_return;
1317                 flags |= XFS_PQUOTA_CHKD;
1318         }
1319
1320         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1321                         NULL);
1322         if (error)
1323                 goto error_return;
1324
1325         /*
1326          * We've made all the changes that we need to make incore.  Flush them
1327          * down to disk buffers if everything was updated successfully.
1328          */
1329         if (XFS_IS_UQUOTA_ON(mp)) {
1330                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1331                                           &buffer_list);
1332         }
1333         if (XFS_IS_GQUOTA_ON(mp)) {
1334                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1335                                            &buffer_list);
1336                 if (!error)
1337                         error = error2;
1338         }
1339         if (XFS_IS_PQUOTA_ON(mp)) {
1340                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1341                                            &buffer_list);
1342                 if (!error)
1343                         error = error2;
1344         }
1345
1346         error2 = xfs_buf_delwri_submit(&buffer_list);
1347         if (!error)
1348                 error = error2;
1349
1350         /*
1351          * We can get this error if we couldn't do a dquot allocation inside
1352          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1353          * dirty dquots that might be cached, we just want to get rid of them
1354          * and turn quotaoff. The dquots won't be attached to any of the inodes
1355          * at this point (because we intentionally didn't in dqget_noattach).
1356          */
1357         if (error) {
1358                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1359                 goto error_return;
1360         }
1361
1362         /*
1363          * If one type of quotas is off, then it will lose its
1364          * quotachecked status, since we won't be doing accounting for
1365          * that type anymore.
1366          */
1367         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1368         mp->m_qflags |= flags;
1369
1370  error_return:
1371         xfs_buf_delwri_cancel(&buffer_list);
1372
1373         if (error) {
1374                 xfs_warn(mp,
1375         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1376                         error);
1377                 /*
1378                  * We must turn off quotas.
1379                  */
1380                 ASSERT(mp->m_quotainfo != NULL);
1381                 xfs_qm_destroy_quotainfo(mp);
1382                 if (xfs_mount_reset_sbqflags(mp)) {
1383                         xfs_warn(mp,
1384                                 "Quotacheck: Failed to reset quota flags.");
1385                 }
1386         } else
1387                 xfs_notice(mp, "Quotacheck: Done.");
1388         return error;
1389 }
1390
1391 /*
1392  * This is called from xfs_mountfs to start quotas and initialize all
1393  * necessary data structures like quotainfo.  This is also responsible for
1394  * running a quotacheck as necessary.  We are guaranteed that the superblock
1395  * is consistently read in at this point.
1396  *
1397  * If we fail here, the mount will continue with quota turned off. We don't
1398  * need to inidicate success or failure at all.
1399  */
1400 void
1401 xfs_qm_mount_quotas(
1402         struct xfs_mount        *mp)
1403 {
1404         int                     error = 0;
1405         uint                    sbf;
1406
1407         /*
1408          * If quotas on realtime volumes is not supported, we disable
1409          * quotas immediately.
1410          */
1411         if (mp->m_sb.sb_rextents) {
1412                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1413                 mp->m_qflags = 0;
1414                 goto write_changes;
1415         }
1416
1417         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1418
1419         /*
1420          * Allocate the quotainfo structure inside the mount struct, and
1421          * create quotainode(s), and change/rev superblock if necessary.
1422          */
1423         error = xfs_qm_init_quotainfo(mp);
1424         if (error) {
1425                 /*
1426                  * We must turn off quotas.
1427                  */
1428                 ASSERT(mp->m_quotainfo == NULL);
1429                 mp->m_qflags = 0;
1430                 goto write_changes;
1431         }
1432         /*
1433          * If any of the quotas are not consistent, do a quotacheck.
1434          */
1435         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1436                 error = xfs_qm_quotacheck(mp);
1437                 if (error) {
1438                         /* Quotacheck failed and disabled quotas. */
1439                         return;
1440                 }
1441         }
1442         /*
1443          * If one type of quotas is off, then it will lose its
1444          * quotachecked status, since we won't be doing accounting for
1445          * that type anymore.
1446          */
1447         if (!XFS_IS_UQUOTA_ON(mp))
1448                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1449         if (!XFS_IS_GQUOTA_ON(mp))
1450                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1451         if (!XFS_IS_PQUOTA_ON(mp))
1452                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1453
1454  write_changes:
1455         /*
1456          * We actually don't have to acquire the m_sb_lock at all.
1457          * This can only be called from mount, and that's single threaded. XXX
1458          */
1459         spin_lock(&mp->m_sb_lock);
1460         sbf = mp->m_sb.sb_qflags;
1461         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1462         spin_unlock(&mp->m_sb_lock);
1463
1464         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1465                 if (xfs_sync_sb(mp, false)) {
1466                         /*
1467                          * We could only have been turning quotas off.
1468                          * We aren't in very good shape actually because
1469                          * the incore structures are convinced that quotas are
1470                          * off, but the on disk superblock doesn't know that !
1471                          */
1472                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1473                         xfs_alert(mp, "%s: Superblock update failed!",
1474                                 __func__);
1475                 }
1476         }
1477
1478         if (error) {
1479                 xfs_warn(mp, "Failed to initialize disk quotas.");
1480                 return;
1481         }
1482 }
1483
1484 /*
1485  * This is called after the superblock has been read in and we're ready to
1486  * iget the quota inodes.
1487  */
1488 STATIC int
1489 xfs_qm_init_quotainos(
1490         xfs_mount_t     *mp)
1491 {
1492         struct xfs_inode        *uip = NULL;
1493         struct xfs_inode        *gip = NULL;
1494         struct xfs_inode        *pip = NULL;
1495         int                     error;
1496         uint                    flags = 0;
1497
1498         ASSERT(mp->m_quotainfo);
1499
1500         /*
1501          * Get the uquota and gquota inodes
1502          */
1503         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1504                 if (XFS_IS_UQUOTA_ON(mp) &&
1505                     mp->m_sb.sb_uquotino != NULLFSINO) {
1506                         ASSERT(mp->m_sb.sb_uquotino > 0);
1507                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1508                                              0, 0, &uip);
1509                         if (error)
1510                                 return error;
1511                 }
1512                 if (XFS_IS_GQUOTA_ON(mp) &&
1513                     mp->m_sb.sb_gquotino != NULLFSINO) {
1514                         ASSERT(mp->m_sb.sb_gquotino > 0);
1515                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1516                                              0, 0, &gip);
1517                         if (error)
1518                                 goto error_rele;
1519                 }
1520                 if (XFS_IS_PQUOTA_ON(mp) &&
1521                     mp->m_sb.sb_pquotino != NULLFSINO) {
1522                         ASSERT(mp->m_sb.sb_pquotino > 0);
1523                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1524                                              0, 0, &pip);
1525                         if (error)
1526                                 goto error_rele;
1527                 }
1528         } else {
1529                 flags |= XFS_QMOPT_SBVERSION;
1530         }
1531
1532         /*
1533          * Create the three inodes, if they don't exist already. The changes
1534          * made above will get added to a transaction and logged in one of
1535          * the qino_alloc calls below.  If the device is readonly,
1536          * temporarily switch to read-write to do this.
1537          */
1538         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1539                 error = xfs_qm_qino_alloc(mp, &uip,
1540                                               flags | XFS_QMOPT_UQUOTA);
1541                 if (error)
1542                         goto error_rele;
1543
1544                 flags &= ~XFS_QMOPT_SBVERSION;
1545         }
1546         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1547                 error = xfs_qm_qino_alloc(mp, &gip,
1548                                           flags | XFS_QMOPT_GQUOTA);
1549                 if (error)
1550                         goto error_rele;
1551
1552                 flags &= ~XFS_QMOPT_SBVERSION;
1553         }
1554         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1555                 error = xfs_qm_qino_alloc(mp, &pip,
1556                                           flags | XFS_QMOPT_PQUOTA);
1557                 if (error)
1558                         goto error_rele;
1559         }
1560
1561         mp->m_quotainfo->qi_uquotaip = uip;
1562         mp->m_quotainfo->qi_gquotaip = gip;
1563         mp->m_quotainfo->qi_pquotaip = pip;
1564
1565         return 0;
1566
1567 error_rele:
1568         if (uip)
1569                 xfs_irele(uip);
1570         if (gip)
1571                 xfs_irele(gip);
1572         if (pip)
1573                 xfs_irele(pip);
1574         return error;
1575 }
1576
1577 STATIC void
1578 xfs_qm_destroy_quotainos(
1579         struct xfs_quotainfo    *qi)
1580 {
1581         if (qi->qi_uquotaip) {
1582                 xfs_irele(qi->qi_uquotaip);
1583                 qi->qi_uquotaip = NULL; /* paranoia */
1584         }
1585         if (qi->qi_gquotaip) {
1586                 xfs_irele(qi->qi_gquotaip);
1587                 qi->qi_gquotaip = NULL;
1588         }
1589         if (qi->qi_pquotaip) {
1590                 xfs_irele(qi->qi_pquotaip);
1591                 qi->qi_pquotaip = NULL;
1592         }
1593 }
1594
1595 STATIC void
1596 xfs_qm_dqfree_one(
1597         struct xfs_dquot        *dqp)
1598 {
1599         struct xfs_mount        *mp = dqp->q_mount;
1600         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1601
1602         mutex_lock(&qi->qi_tree_lock);
1603         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1604                           be32_to_cpu(dqp->q_core.d_id));
1605
1606         qi->qi_dquots--;
1607         mutex_unlock(&qi->qi_tree_lock);
1608
1609         xfs_qm_dqdestroy(dqp);
1610 }
1611
1612 /* --------------- utility functions for vnodeops ---------------- */
1613
1614
1615 /*
1616  * Given an inode, a uid, gid and prid make sure that we have
1617  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1618  * quotas by creating this file.
1619  * This also attaches dquot(s) to the given inode after locking it,
1620  * and returns the dquots corresponding to the uid and/or gid.
1621  *
1622  * in   : inode (unlocked)
1623  * out  : udquot, gdquot with references taken and unlocked
1624  */
1625 int
1626 xfs_qm_vop_dqalloc(
1627         struct xfs_inode        *ip,
1628         kuid_t                  uid,
1629         kgid_t                  gid,
1630         prid_t                  prid,
1631         uint                    flags,
1632         struct xfs_dquot        **O_udqpp,
1633         struct xfs_dquot        **O_gdqpp,
1634         struct xfs_dquot        **O_pdqpp)
1635 {
1636         struct xfs_mount        *mp = ip->i_mount;
1637         struct inode            *inode = VFS_I(ip);
1638         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1639         struct xfs_dquot        *uq = NULL;
1640         struct xfs_dquot        *gq = NULL;
1641         struct xfs_dquot        *pq = NULL;
1642         int                     error;
1643         uint                    lockflags;
1644
1645         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1646                 return 0;
1647
1648         lockflags = XFS_ILOCK_EXCL;
1649         xfs_ilock(ip, lockflags);
1650
1651         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1652                 gid = inode->i_gid;
1653
1654         /*
1655          * Attach the dquot(s) to this inode, doing a dquot allocation
1656          * if necessary. The dquot(s) will not be locked.
1657          */
1658         if (XFS_NOT_DQATTACHED(mp, ip)) {
1659                 error = xfs_qm_dqattach_locked(ip, true);
1660                 if (error) {
1661                         xfs_iunlock(ip, lockflags);
1662                         return error;
1663                 }
1664         }
1665
1666         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1667                 if (!uid_eq(inode->i_uid, uid)) {
1668                         /*
1669                          * What we need is the dquot that has this uid, and
1670                          * if we send the inode to dqget, the uid of the inode
1671                          * takes priority over what's sent in the uid argument.
1672                          * We must unlock inode here before calling dqget if
1673                          * we're not sending the inode, because otherwise
1674                          * we'll deadlock by doing trans_reserve while
1675                          * holding ilock.
1676                          */
1677                         xfs_iunlock(ip, lockflags);
1678                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1679                                         XFS_DQ_USER, true, &uq);
1680                         if (error) {
1681                                 ASSERT(error != -ENOENT);
1682                                 return error;
1683                         }
1684                         /*
1685                          * Get the ilock in the right order.
1686                          */
1687                         xfs_dqunlock(uq);
1688                         lockflags = XFS_ILOCK_SHARED;
1689                         xfs_ilock(ip, lockflags);
1690                 } else {
1691                         /*
1692                          * Take an extra reference, because we'll return
1693                          * this to caller
1694                          */
1695                         ASSERT(ip->i_udquot);
1696                         uq = xfs_qm_dqhold(ip->i_udquot);
1697                 }
1698         }
1699         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1700                 if (!gid_eq(inode->i_gid, gid)) {
1701                         xfs_iunlock(ip, lockflags);
1702                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1703                                         XFS_DQ_GROUP, true, &gq);
1704                         if (error) {
1705                                 ASSERT(error != -ENOENT);
1706                                 goto error_rele;
1707                         }
1708                         xfs_dqunlock(gq);
1709                         lockflags = XFS_ILOCK_SHARED;
1710                         xfs_ilock(ip, lockflags);
1711                 } else {
1712                         ASSERT(ip->i_gdquot);
1713                         gq = xfs_qm_dqhold(ip->i_gdquot);
1714                 }
1715         }
1716         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1717                 if (ip->i_d.di_projid != prid) {
1718                         xfs_iunlock(ip, lockflags);
1719                         error = xfs_qm_dqget(mp, (xfs_dqid_t)prid, XFS_DQ_PROJ,
1720                                         true, &pq);
1721                         if (error) {
1722                                 ASSERT(error != -ENOENT);
1723                                 goto error_rele;
1724                         }
1725                         xfs_dqunlock(pq);
1726                         lockflags = XFS_ILOCK_SHARED;
1727                         xfs_ilock(ip, lockflags);
1728                 } else {
1729                         ASSERT(ip->i_pdquot);
1730                         pq = xfs_qm_dqhold(ip->i_pdquot);
1731                 }
1732         }
1733         if (uq)
1734                 trace_xfs_dquot_dqalloc(ip);
1735
1736         xfs_iunlock(ip, lockflags);
1737         if (O_udqpp)
1738                 *O_udqpp = uq;
1739         else
1740                 xfs_qm_dqrele(uq);
1741         if (O_gdqpp)
1742                 *O_gdqpp = gq;
1743         else
1744                 xfs_qm_dqrele(gq);
1745         if (O_pdqpp)
1746                 *O_pdqpp = pq;
1747         else
1748                 xfs_qm_dqrele(pq);
1749         return 0;
1750
1751 error_rele:
1752         xfs_qm_dqrele(gq);
1753         xfs_qm_dqrele(uq);
1754         return error;
1755 }
1756
1757 /*
1758  * Actually transfer ownership, and do dquot modifications.
1759  * These were already reserved.
1760  */
1761 struct xfs_dquot *
1762 xfs_qm_vop_chown(
1763         struct xfs_trans        *tp,
1764         struct xfs_inode        *ip,
1765         struct xfs_dquot        **IO_olddq,
1766         struct xfs_dquot        *newdq)
1767 {
1768         struct xfs_dquot        *prevdq;
1769         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1770                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1771
1772
1773         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1774         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1775
1776         /* old dquot */
1777         prevdq = *IO_olddq;
1778         ASSERT(prevdq);
1779         ASSERT(prevdq != newdq);
1780
1781         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1782         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1783
1784         /* the sparkling new dquot */
1785         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1786         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1787
1788         /*
1789          * Take an extra reference, because the inode is going to keep
1790          * this dquot pointer even after the trans_commit.
1791          */
1792         *IO_olddq = xfs_qm_dqhold(newdq);
1793
1794         return prevdq;
1795 }
1796
1797 /*
1798  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1799  */
1800 int
1801 xfs_qm_vop_chown_reserve(
1802         struct xfs_trans        *tp,
1803         struct xfs_inode        *ip,
1804         struct xfs_dquot        *udqp,
1805         struct xfs_dquot        *gdqp,
1806         struct xfs_dquot        *pdqp,
1807         uint                    flags)
1808 {
1809         struct xfs_mount        *mp = ip->i_mount;
1810         uint64_t                delblks;
1811         unsigned int            blkflags, prjflags = 0;
1812         struct xfs_dquot        *udq_unres = NULL;
1813         struct xfs_dquot        *gdq_unres = NULL;
1814         struct xfs_dquot        *pdq_unres = NULL;
1815         struct xfs_dquot        *udq_delblks = NULL;
1816         struct xfs_dquot        *gdq_delblks = NULL;
1817         struct xfs_dquot        *pdq_delblks = NULL;
1818         int                     error;
1819
1820
1821         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1822         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1823
1824         delblks = ip->i_delayed_blks;
1825         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1826                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1827
1828         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1829             i_uid_read(VFS_I(ip)) != be32_to_cpu(udqp->q_core.d_id)) {
1830                 udq_delblks = udqp;
1831                 /*
1832                  * If there are delayed allocation blocks, then we have to
1833                  * unreserve those from the old dquot, and add them to the
1834                  * new dquot.
1835                  */
1836                 if (delblks) {
1837                         ASSERT(ip->i_udquot);
1838                         udq_unres = ip->i_udquot;
1839                 }
1840         }
1841         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1842             i_gid_read(VFS_I(ip)) != be32_to_cpu(gdqp->q_core.d_id)) {
1843                 gdq_delblks = gdqp;
1844                 if (delblks) {
1845                         ASSERT(ip->i_gdquot);
1846                         gdq_unres = ip->i_gdquot;
1847                 }
1848         }
1849
1850         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1851             ip->i_d.di_projid != be32_to_cpu(pdqp->q_core.d_id)) {
1852                 prjflags = XFS_QMOPT_ENOSPC;
1853                 pdq_delblks = pdqp;
1854                 if (delblks) {
1855                         ASSERT(ip->i_pdquot);
1856                         pdq_unres = ip->i_pdquot;
1857                 }
1858         }
1859
1860         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1861                                 udq_delblks, gdq_delblks, pdq_delblks,
1862                                 ip->i_d.di_nblocks, 1,
1863                                 flags | blkflags | prjflags);
1864         if (error)
1865                 return error;
1866
1867         /*
1868          * Do the delayed blks reservations/unreservations now. Since, these
1869          * are done without the help of a transaction, if a reservation fails
1870          * its previous reservations won't be automatically undone by trans
1871          * code. So, we have to do it manually here.
1872          */
1873         if (delblks) {
1874                 /*
1875                  * Do the reservations first. Unreservation can't fail.
1876                  */
1877                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1878                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1879                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1880                             udq_delblks, gdq_delblks, pdq_delblks,
1881                             (xfs_qcnt_t)delblks, 0,
1882                             flags | blkflags | prjflags);
1883                 if (error)
1884                         return error;
1885                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1886                                 udq_unres, gdq_unres, pdq_unres,
1887                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1888         }
1889
1890         return 0;
1891 }
1892
1893 int
1894 xfs_qm_vop_rename_dqattach(
1895         struct xfs_inode        **i_tab)
1896 {
1897         struct xfs_mount        *mp = i_tab[0]->i_mount;
1898         int                     i;
1899
1900         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1901                 return 0;
1902
1903         for (i = 0; (i < 4 && i_tab[i]); i++) {
1904                 struct xfs_inode        *ip = i_tab[i];
1905                 int                     error;
1906
1907                 /*
1908                  * Watch out for duplicate entries in the table.
1909                  */
1910                 if (i == 0 || ip != i_tab[i-1]) {
1911                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1912                                 error = xfs_qm_dqattach(ip);
1913                                 if (error)
1914                                         return error;
1915                         }
1916                 }
1917         }
1918         return 0;
1919 }
1920
1921 void
1922 xfs_qm_vop_create_dqattach(
1923         struct xfs_trans        *tp,
1924         struct xfs_inode        *ip,
1925         struct xfs_dquot        *udqp,
1926         struct xfs_dquot        *gdqp,
1927         struct xfs_dquot        *pdqp)
1928 {
1929         struct xfs_mount        *mp = tp->t_mountp;
1930
1931         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1932                 return;
1933
1934         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1935         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1936
1937         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1938                 ASSERT(ip->i_udquot == NULL);
1939                 ASSERT(i_uid_read(VFS_I(ip)) == be32_to_cpu(udqp->q_core.d_id));
1940
1941                 ip->i_udquot = xfs_qm_dqhold(udqp);
1942                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1943         }
1944         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1945                 ASSERT(ip->i_gdquot == NULL);
1946                 ASSERT(i_gid_read(VFS_I(ip)) == be32_to_cpu(gdqp->q_core.d_id));
1947
1948                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1949                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1950         }
1951         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1952                 ASSERT(ip->i_pdquot == NULL);
1953                 ASSERT(ip->i_d.di_projid == be32_to_cpu(pdqp->q_core.d_id));
1954
1955                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1956                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1957         }
1958 }
1959