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(xfs_mount_t *);
  34 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  35
  36 STATIC void     xfs_qm_destroy_quotainos(xfs_quotainfo_t *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                         dqp->dq_flags &= ~XFS_DQ_FREEING;
 152                         goto out_unlock;
 153                 }
 154                 xfs_dqflock(dqp);
 155         }
 156
 157         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 158         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 159                 !test_bit(XFS_LI_IN_AIL, &dqp->q_logitem.qli_item.li_flags));
 160
 161         xfs_dqfunlock(dqp);
 162         xfs_dqunlock(dqp);
 163
 164         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 165                           be32_to_cpu(dqp->q_core.d_id));
 166         qi->qi_dquots--;
 167
 168         /*
 169          * We move dquots to the freelist as soon as their reference count
 170          * hits zero, so it really should be on the freelist here.
 171          */
 172         ASSERT(!list_empty(&dqp->q_lru));
 173         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 174         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 175
 176         xfs_qm_dqdestroy(dqp);
 177         return 0;
 178
 179 out_unlock:
 180         xfs_dqunlock(dqp);
 181         return error;
 182 }
 183
 184 /*
 185  * Purge the dquot cache.
 186  */
 187 void
 188 xfs_qm_dqpurge_all(
 189         struct xfs_mount        *mp,
 190         uint                    flags)
 191 {
 192         if (flags & XFS_QMOPT_UQUOTA)
 193                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 194         if (flags & XFS_QMOPT_GQUOTA)
 195                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 196         if (flags & XFS_QMOPT_PQUOTA)
 197                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 198 }
 199
 200 /*
 201  * Just destroy the quotainfo structure.
 202  */
 203 void
 204 xfs_qm_unmount(
 205         struct xfs_mount        *mp)
 206 {
 207         if (mp->m_quotainfo) {
 208                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 209                 xfs_qm_destroy_quotainfo(mp);
 210         }
 211 }
 212
 213 /*
 214  * Called from the vfsops layer.
 215  */
 216 void
 217 xfs_qm_unmount_quotas(
 218         xfs_mount_t     *mp)
 219 {
 220         /*
 221          * Release the dquots that root inode, et al might be holding,
 222          * before we flush quotas and blow away the quotainfo structure.
 223          */
 224         ASSERT(mp->m_rootip);
 225         xfs_qm_dqdetach(mp->m_rootip);
 226         if (mp->m_rbmip)
 227                 xfs_qm_dqdetach(mp->m_rbmip);
 228         if (mp->m_rsumip)
 229                 xfs_qm_dqdetach(mp->m_rsumip);
 230
 231         /*
 232          * Release the quota inodes.
 233          */
 234         if (mp->m_quotainfo) {
 235                 if (mp->m_quotainfo->qi_uquotaip) {
 236                         xfs_irele(mp->m_quotainfo->qi_uquotaip);
 237                         mp->m_quotainfo->qi_uquotaip = NULL;
 238                 }
 239                 if (mp->m_quotainfo->qi_gquotaip) {
 240                         xfs_irele(mp->m_quotainfo->qi_gquotaip);
 241                         mp->m_quotainfo->qi_gquotaip = NULL;
 242                 }
 243                 if (mp->m_quotainfo->qi_pquotaip) {
 244                         xfs_irele(mp->m_quotainfo->qi_pquotaip);
 245                         mp->m_quotainfo->qi_pquotaip = NULL;
 246                 }
 247         }
 248 }
 249
 250 STATIC int
 251 xfs_qm_dqattach_one(
 252         struct xfs_inode        *ip,
 253         xfs_dqid_t              id,
 254         uint                    type,
 255         bool                    doalloc,
 256         struct xfs_dquot        **IO_idqpp)
 257 {
 258         struct xfs_dquot        *dqp;
 259         int                     error;
 260
 261         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 262         error = 0;
 263
 264         /*
 265          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 266          * or &i_gdquot. This made the code look weird, but made the logic a lot
 267          * simpler.
 268          */
 269         dqp = *IO_idqpp;
 270         if (dqp) {
 271                 trace_xfs_dqattach_found(dqp);
 272                 return 0;
 273         }
 274
 275         /*
 276          * Find the dquot from somewhere. This bumps the reference count of
 277          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 278          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 279          * turned off suddenly.
 280          */
 281         error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
 282         if (error)
 283                 return error;
 284
 285         trace_xfs_dqattach_get(dqp);
 286
 287         /*
 288          * dqget may have dropped and re-acquired the ilock, but it guarantees
 289          * that the dquot returned is the one that should go in the inode.
 290          */
 291         *IO_idqpp = dqp;
 292         xfs_dqunlock(dqp);
 293         return 0;
 294 }
 295
 296 static bool
 297 xfs_qm_need_dqattach(
 298         struct xfs_inode        *ip)
 299 {
 300         struct xfs_mount        *mp = ip->i_mount;
 301
 302         if (!XFS_IS_QUOTA_RUNNING(mp))
 303                 return false;
 304         if (!XFS_IS_QUOTA_ON(mp))
 305                 return false;
 306         if (!XFS_NOT_DQATTACHED(mp, ip))
 307                 return false;
 308         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 309                 return false;
 310         return true;
 311 }
 312
 313 /*
 314  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 315  * into account.
 316  * If @doalloc is true, the dquot(s) will be allocated if needed.
 317  * Inode may get unlocked and relocked in here, and the caller must deal with
 318  * the consequences.
 319  */
 320 int
 321 xfs_qm_dqattach_locked(
 322         xfs_inode_t     *ip,
 323         bool            doalloc)
 324 {
 325         xfs_mount_t     *mp = ip->i_mount;
 326         int             error = 0;
 327
 328         if (!xfs_qm_need_dqattach(ip))
 329                 return 0;
 330
 331         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 332
 333         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 334                 error = xfs_qm_dqattach_one(ip, i_uid_read(VFS_I(ip)),
 335                                 XFS_DQ_USER, doalloc, &ip->i_udquot);
 336                 if (error)
 337                         goto done;
 338                 ASSERT(ip->i_udquot);
 339         }
 340
 341         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 342                 error = xfs_qm_dqattach_one(ip, i_gid_read(VFS_I(ip)),
 343                                 XFS_DQ_GROUP, doalloc, &ip->i_gdquot);
 344                 if (error)
 345                         goto done;
 346                 ASSERT(ip->i_gdquot);
 347         }
 348
 349         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 350                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
 351                                 doalloc, &ip->i_pdquot);
 352                 if (error)
 353                         goto done;
 354                 ASSERT(ip->i_pdquot);
 355         }
 356
 357 done:
 358         /*
 359          * Don't worry about the dquots that we may have attached before any
 360          * error - they'll get detached later if it has not already been done.
 361          */
 362         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 363         return error;
 364 }
 365
 366 int
 367 xfs_qm_dqattach(
 368         struct xfs_inode        *ip)
 369 {
 370         int                     error;
 371
 372         if (!xfs_qm_need_dqattach(ip))
 373                 return 0;
 374
 375         xfs_ilock(ip, XFS_ILOCK_EXCL);
 376         error = xfs_qm_dqattach_locked(ip, false);
 377         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 378
 379         return error;
 380 }
 381
 382 /*
 383  * Release dquots (and their references) if any.
 384  * The inode should be locked EXCL except when this's called by
 385  * xfs_ireclaim.
 386  */
 387 void
 388 xfs_qm_dqdetach(
 389         xfs_inode_t     *ip)
 390 {
 391         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 392                 return;
 393
 394         trace_xfs_dquot_dqdetach(ip);
 395
 396         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 397         if (ip->i_udquot) {
 398                 xfs_qm_dqrele(ip->i_udquot);
 399                 ip->i_udquot = NULL;
 400         }
 401         if (ip->i_gdquot) {
 402                 xfs_qm_dqrele(ip->i_gdquot);
 403                 ip->i_gdquot = NULL;
 404         }
 405         if (ip->i_pdquot) {
 406                 xfs_qm_dqrele(ip->i_pdquot);
 407                 ip->i_pdquot = NULL;
 408         }
 409 }
 410
 411 struct xfs_qm_isolate {
 412         struct list_head        buffers;
 413         struct list_head        dispose;
 414 };
 415
 416 static enum lru_status
 417 xfs_qm_dquot_isolate(
 418         struct list_head        *item,
 419         struct list_lru_one     *lru,
 420         spinlock_t              *lru_lock,
 421         void                    *arg)
 422                 __releases(lru_lock) __acquires(lru_lock)
 423 {
 424         struct xfs_dquot        *dqp = container_of(item,
 425                                                 struct xfs_dquot, q_lru);
 426         struct xfs_qm_isolate   *isol = arg;
 427
 428         if (!xfs_dqlock_nowait(dqp))
 429                 goto out_miss_busy;
 430
 431         /*
 432          * This dquot has acquired a reference in the meantime remove it from
 433          * the freelist and try again.
 434          */
 435         if (dqp->q_nrefs) {
 436                 xfs_dqunlock(dqp);
 437                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 438
 439                 trace_xfs_dqreclaim_want(dqp);
 440                 list_lru_isolate(lru, &dqp->q_lru);
 441                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 442                 return LRU_REMOVED;
 443         }
 444
 445         /*
 446          * If the dquot is dirty, flush it. If it's already being flushed, just
 447          * skip it so there is time for the IO to complete before we try to
 448          * reclaim it again on the next LRU pass.
 449          */
 450         if (!xfs_dqflock_nowait(dqp)) {
 451                 xfs_dqunlock(dqp);
 452                 goto out_miss_busy;
 453         }
 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->dq_flags |= XFS_DQ_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_busy:
 488         trace_xfs_dqreclaim_busy(dqp);
 489         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 490         return LRU_SKIP;
 491
 492 out_unlock_dirty:
 493         trace_xfs_dqreclaim_busy(dqp);
 494         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 495         xfs_dqunlock(dqp);
 496         spin_lock(lru_lock);
 497         return LRU_RETRY;
 498 }
 499
 500 static unsigned long
 501 xfs_qm_shrink_scan(
 502         struct shrinker         *shrink,
 503         struct shrink_control   *sc)
 504 {
 505         struct xfs_quotainfo    *qi = container_of(shrink,
 506                                         struct xfs_quotainfo, qi_shrinker);
 507         struct xfs_qm_isolate   isol;
 508         unsigned long           freed;
 509         int                     error;
 510
 511         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 512                 return 0;
 513
 514         INIT_LIST_HEAD(&isol.buffers);
 515         INIT_LIST_HEAD(&isol.dispose);
 516
 517         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 518                                      xfs_qm_dquot_isolate, &isol);
 519
 520         error = xfs_buf_delwri_submit(&isol.buffers);
 521         if (error)
 522                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 523
 524         while (!list_empty(&isol.dispose)) {
 525                 struct xfs_dquot        *dqp;
 526
 527                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 528                 list_del_init(&dqp->q_lru);
 529                 xfs_qm_dqfree_one(dqp);
 530         }
 531
 532         return freed;
 533 }
 534
 535 static unsigned long
 536 xfs_qm_shrink_count(
 537         struct shrinker         *shrink,
 538         struct shrink_control   *sc)
 539 {
 540         struct xfs_quotainfo    *qi = container_of(shrink,
 541                                         struct xfs_quotainfo, qi_shrinker);
 542
 543         return list_lru_shrink_count(&qi->qi_lru, sc);
 544 }
 545
 546 STATIC void
 547 xfs_qm_set_defquota(
 548         xfs_mount_t     *mp,
 549         uint            type,
 550         xfs_quotainfo_t *qinf)
 551 {
 552         struct xfs_dquot        *dqp;
 553         struct xfs_def_quota    *defq;
 554         struct xfs_disk_dquot   *ddqp;
 555         int                     error;
 556
 557         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 558         if (error)
 559                 return;
 560
 561         ddqp = &dqp->q_core;
 562         defq = xfs_get_defquota(dqp, qinf);
 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->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 569         defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 570         defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 571         defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 572         defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 573         defq->rtbsoftlimit = be64_to_cpu(ddqp->d_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         struct xfs_quotainfo    *qinf)
 582 {
 583         struct xfs_disk_dquot   *ddqp;
 584         struct xfs_dquot        *dqp;
 585         uint                    type;
 586         int                     error;
 587
 588         qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 589         qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 590         qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 591         qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 592         qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 593         qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 594
 595         /*
 596          * We try to get the limits from the superuser's limits fields.
 597          * This is quite hacky, but it is standard quota practice.
 598          *
 599          * Since we may not have done a quotacheck by this point, just read
 600          * the dquot without attaching it to any hashtables or lists.
 601          *
 602          * Timers and warnings are globally set by the first timer found in
 603          * user/group/proj quota types, otherwise a default value is used.
 604          * This should be split into different fields per quota type.
 605          */
 606         if (XFS_IS_UQUOTA_RUNNING(mp))
 607                 type = XFS_DQ_USER;
 608         else if (XFS_IS_GQUOTA_RUNNING(mp))
 609                 type = XFS_DQ_GROUP;
 610         else
 611                 type = XFS_DQ_PROJ;
 612         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 613         if (error)
 614                 return;
 615
 616         ddqp = &dqp->q_core;
 617         /*
 618          * The warnings and timers set the grace period given to
 619          * a user or group before he or she can not perform any
 620          * more writing. If it is zero, a default is used.
 621          */
 622         if (ddqp->d_btimer)
 623                 qinf->qi_btimelimit = be32_to_cpu(ddqp->d_btimer);
 624         if (ddqp->d_itimer)
 625                 qinf->qi_itimelimit = be32_to_cpu(ddqp->d_itimer);
 626         if (ddqp->d_rtbtimer)
 627                 qinf->qi_rtbtimelimit = be32_to_cpu(ddqp->d_rtbtimer);
 628         if (ddqp->d_bwarns)
 629                 qinf->qi_bwarnlimit = be16_to_cpu(ddqp->d_bwarns);
 630         if (ddqp->d_iwarns)
 631                 qinf->qi_iwarnlimit = be16_to_cpu(ddqp->d_iwarns);
 632         if (ddqp->d_rtbwarns)
 633                 qinf->qi_rtbwarnlimit = be16_to_cpu(ddqp->d_rtbwarns);
 634
 635         xfs_qm_dqdestroy(dqp);
 636 }
 637
 638 /*
 639  * This initializes all the quota information that's kept in the
 640  * mount structure
 641  */
 642 STATIC int
 643 xfs_qm_init_quotainfo(
 644         struct xfs_mount        *mp)
 645 {
 646         struct xfs_quotainfo    *qinf;
 647         int                     error;
 648
 649         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 650
 651         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), 0);
 652
 653         error = list_lru_init(&qinf->qi_lru);
 654         if (error)
 655                 goto out_free_qinf;
 656
 657         /*
 658          * See if quotainodes are setup, and if not, allocate them,
 659          * and change the superblock accordingly.
 660          */
 661         error = xfs_qm_init_quotainos(mp);
 662         if (error)
 663                 goto out_free_lru;
 664
 665         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 666         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 667         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 668         mutex_init(&qinf->qi_tree_lock);
 669
 670         /* mutex used to serialize quotaoffs */
 671         mutex_init(&qinf->qi_quotaofflock);
 672
 673         /* Precalc some constants */
 674         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 675         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 676
 677         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 678
 679         xfs_qm_init_timelimits(mp, qinf);
 680
 681         if (XFS_IS_UQUOTA_RUNNING(mp))
 682                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 683         if (XFS_IS_GQUOTA_RUNNING(mp))
 684                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 685         if (XFS_IS_PQUOTA_RUNNING(mp))
 686                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 687
 688         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 689         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 690         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 691         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 692
 693         error = register_shrinker(&qinf->qi_shrinker);
 694         if (error)
 695                 goto out_free_inos;
 696
 697         return 0;
 698
 699 out_free_inos:
 700         mutex_destroy(&qinf->qi_quotaofflock);
 701         mutex_destroy(&qinf->qi_tree_lock);
 702         xfs_qm_destroy_quotainos(qinf);
 703 out_free_lru:
 704         list_lru_destroy(&qinf->qi_lru);
 705 out_free_qinf:
 706         kmem_free(qinf);
 707         mp->m_quotainfo = NULL;
 708         return error;
 709 }
 710
 711 /*
 712  * Gets called when unmounting a filesystem or when all quotas get
 713  * turned off.
 714  * This purges the quota inodes, destroys locks and frees itself.
 715  */
 716 void
 717 xfs_qm_destroy_quotainfo(
 718         xfs_mount_t     *mp)
 719 {
 720         xfs_quotainfo_t *qi;
 721
 722         qi = mp->m_quotainfo;
 723         ASSERT(qi != NULL);
 724
 725         unregister_shrinker(&qi->qi_shrinker);
 726         list_lru_destroy(&qi->qi_lru);
 727         xfs_qm_destroy_quotainos(qi);
 728         mutex_destroy(&qi->qi_tree_lock);
 729         mutex_destroy(&qi->qi_quotaofflock);
 730         kmem_free(qi);
 731         mp->m_quotainfo = NULL;
 732 }
 733
 734 /*
 735  * Create an inode and return with a reference already taken, but unlocked
 736  * This is how we create quota inodes
 737  */
 738 STATIC int
 739 xfs_qm_qino_alloc(
 740         xfs_mount_t     *mp,
 741         xfs_inode_t     **ip,
 742         uint            flags)
 743 {
 744         xfs_trans_t     *tp;
 745         int             error;
 746         bool            need_alloc = true;
 747
 748         *ip = NULL;
 749         /*
 750          * With superblock that doesn't have separate pquotino, we
 751          * share an inode between gquota and pquota. If the on-disk
 752          * superblock has GQUOTA and the filesystem is now mounted
 753          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 754          * vice-versa.
 755          */
 756         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 757                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 758                 xfs_ino_t ino = NULLFSINO;
 759
 760                 if ((flags & XFS_QMOPT_PQUOTA) &&
 761                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 762                         ino = mp->m_sb.sb_gquotino;
 763                         if (mp->m_sb.sb_pquotino != NULLFSINO) {
 764                                 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
 765                                                 mp);
 766                                 return -EFSCORRUPTED;
 767                         }
 768                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 769                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 770                         ino = mp->m_sb.sb_pquotino;
 771                         if (mp->m_sb.sb_gquotino != NULLFSINO) {
 772                                 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
 773                                                 mp);
 774                                 return -EFSCORRUPTED;
 775                         }
 776                 }
 777                 if (ino != NULLFSINO) {
 778                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 779                         if (error)
 780                                 return error;
 781                         mp->m_sb.sb_gquotino = NULLFSINO;
 782                         mp->m_sb.sb_pquotino = NULLFSINO;
 783                         need_alloc = false;
 784                 }
 785         }
 786
 787         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 788                         XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 789         if (error)
 790                 return error;
 791
 792         if (need_alloc) {
 793                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
 794                 if (error) {
 795                         xfs_trans_cancel(tp);
 796                         return error;
 797                 }
 798         }
 799
 800         /*
 801          * Make the changes in the superblock, and log those too.
 802          * sbfields arg may contain fields other than *QUOTINO;
 803          * VERSIONNUM for example.
 804          */
 805         spin_lock(&mp->m_sb_lock);
 806         if (flags & XFS_QMOPT_SBVERSION) {
 807                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 808
 809                 xfs_sb_version_addquota(&mp->m_sb);
 810                 mp->m_sb.sb_uquotino = NULLFSINO;
 811                 mp->m_sb.sb_gquotino = NULLFSINO;
 812                 mp->m_sb.sb_pquotino = NULLFSINO;
 813
 814                 /* qflags will get updated fully _after_ quotacheck */
 815                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 816         }
 817         if (flags & XFS_QMOPT_UQUOTA)
 818                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 819         else if (flags & XFS_QMOPT_GQUOTA)
 820                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 821         else
 822                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 823         spin_unlock(&mp->m_sb_lock);
 824         xfs_log_sb(tp);
 825
 826         error = xfs_trans_commit(tp);
 827         if (error) {
 828                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 829                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 830         }
 831         if (need_alloc)
 832                 xfs_finish_inode_setup(*ip);
 833         return error;
 834 }
 835
 836
 837 STATIC void
 838 xfs_qm_reset_dqcounts(
 839         xfs_mount_t     *mp,
 840         xfs_buf_t       *bp,
 841         xfs_dqid_t      id,
 842         uint            type)
 843 {
 844         struct xfs_dqblk        *dqb;
 845         int                     j;
 846         xfs_failaddr_t          fa;
 847
 848         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 849
 850         /*
 851          * Reset all counters and timers. They'll be
 852          * started afresh by xfs_qm_quotacheck.
 853          */
 854 #ifdef DEBUG
 855         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 856                 sizeof(xfs_dqblk_t);
 857         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 858 #endif
 859         dqb = bp->b_addr;
 860         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 861                 struct xfs_disk_dquot   *ddq;
 862
 863                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 864
 865                 /*
 866                  * Do a sanity check, and if needed, repair the dqblk. Don't
 867                  * output any warnings because it's perfectly possible to
 868                  * find uninitialised dquot blks. See comment in
 869                  * xfs_dquot_verify.
 870                  */
 871                 fa = xfs_dqblk_verify(mp, &dqb[j], id + j, type);
 872                 if (fa)
 873                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 874
 875                 /*
 876                  * Reset type in case we are reusing group quota file for
 877                  * project quotas or vice versa
 878                  */
 879                 ddq->d_flags = type;
 880                 ddq->d_bcount = 0;
 881                 ddq->d_icount = 0;
 882                 ddq->d_rtbcount = 0;
 883
 884                 /*
 885                  * dquot id 0 stores the default grace period and the maximum
 886                  * warning limit that were set by the administrator, so we
 887                  * should not reset them.
 888                  */
 889                 if (ddq->d_id != 0) {
 890                         ddq->d_btimer = 0;
 891                         ddq->d_itimer = 0;
 892                         ddq->d_rtbtimer = 0;
 893                         ddq->d_bwarns = 0;
 894                         ddq->d_iwarns = 0;
 895                         ddq->d_rtbwarns = 0;
 896                 }
 897
 898                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 899                         xfs_update_cksum((char *)&dqb[j],
 900                                          sizeof(struct xfs_dqblk),
 901                                          XFS_DQUOT_CRC_OFF);
 902                 }
 903         }
 904 }
 905
 906 STATIC int
 907 xfs_qm_reset_dqcounts_all(
 908         struct xfs_mount        *mp,
 909         xfs_dqid_t              firstid,
 910         xfs_fsblock_t           bno,
 911         xfs_filblks_t           blkcnt,
 912         uint                    flags,
 913         struct list_head        *buffer_list)
 914 {
 915         struct xfs_buf          *bp;
 916         int                     error;
 917         int                     type;
 918
 919         ASSERT(blkcnt > 0);
 920         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 921                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 922         error = 0;
 923
 924         /*
 925          * Blkcnt arg can be a very big number, and might even be
 926          * larger than the log itself. So, we have to break it up into
 927          * manageable-sized transactions.
 928          * Note that we don't start a permanent transaction here; we might
 929          * not be able to get a log reservation for the whole thing up front,
 930          * and we don't really care to either, because we just discard
 931          * everything if we were to crash in the middle of this loop.
 932          */
 933         while (blkcnt--) {
 934                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 935                               XFS_FSB_TO_DADDR(mp, bno),
 936                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 937                               &xfs_dquot_buf_ops);
 938
 939                 /*
 940                  * CRC and validation errors will return a EFSCORRUPTED here. If
 941                  * this occurs, re-read without CRC validation so that we can
 942                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 943                  * will leave a trace in the log indicating corruption has
 944                  * been detected.
 945                  */
 946                 if (error == -EFSCORRUPTED) {
 947                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 948                                       XFS_FSB_TO_DADDR(mp, bno),
 949                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 950                                       NULL);
 951                 }
 952
 953                 if (error)
 954                         break;
 955
 956                 /*
 957                  * A corrupt buffer might not have a verifier attached, so
 958                  * make sure we have the correct one attached before writeback
 959                  * occurs.
 960                  */
 961                 bp->b_ops = &xfs_dquot_buf_ops;
 962                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 963                 xfs_buf_delwri_queue(bp, buffer_list);
 964                 xfs_buf_relse(bp);
 965
 966                 /* goto the next block. */
 967                 bno++;
 968                 firstid += mp->m_quotainfo->qi_dqperchunk;
 969         }
 970
 971         return error;
 972 }
 973
 974 /*
 975  * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 976  * counters for every chunk of dquots that we find.
 977  */
 978 STATIC int
 979 xfs_qm_reset_dqcounts_buf(
 980         struct xfs_mount        *mp,
 981         struct xfs_inode        *qip,
 982         uint                    flags,
 983         struct list_head        *buffer_list)
 984 {
 985         struct xfs_bmbt_irec    *map;
 986         int                     i, nmaps;       /* number of map entries */
 987         int                     error;          /* return value */
 988         xfs_fileoff_t           lblkno;
 989         xfs_filblks_t           maxlblkcnt;
 990         xfs_dqid_t              firstid;
 991         xfs_fsblock_t           rablkno;
 992         xfs_filblks_t           rablkcnt;
 993
 994         error = 0;
 995         /*
 996          * This looks racy, but we can't keep an inode lock across a
 997          * trans_reserve. But, this gets called during quotacheck, and that
 998          * happens only at mount time which is single threaded.
 999          */
1000         if (qip->i_d.di_nblocks == 0)
1001                 return 0;
1002
1003         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
1004
1005         lblkno = 0;
1006         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
1007         do {
1008                 uint            lock_mode;
1009
1010                 nmaps = XFS_DQITER_MAP_SIZE;
1011                 /*
1012                  * We aren't changing the inode itself. Just changing
1013                  * some of its data. No new blocks are added here, and
1014                  * the inode is never added to the transaction.
1015                  */
1016                 lock_mode = xfs_ilock_data_map_shared(qip);
1017                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1018                                        map, &nmaps, 0);
1019                 xfs_iunlock(qip, lock_mode);
1020                 if (error)
1021                         break;
1022
1023                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1024                 for (i = 0; i < nmaps; i++) {
1025                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1026                         ASSERT(map[i].br_blockcount);
1027
1028
1029                         lblkno += map[i].br_blockcount;
1030
1031                         if (map[i].br_startblock == HOLESTARTBLOCK)
1032                                 continue;
1033
1034                         firstid = (xfs_dqid_t) map[i].br_startoff *
1035                                 mp->m_quotainfo->qi_dqperchunk;
1036                         /*
1037                          * Do a read-ahead on the next extent.
1038                          */
1039                         if ((i+1 < nmaps) &&
1040                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1041                                 rablkcnt =  map[i+1].br_blockcount;
1042                                 rablkno = map[i+1].br_startblock;
1043                                 while (rablkcnt--) {
1044                                         xfs_buf_readahead(mp->m_ddev_targp,
1045                                                XFS_FSB_TO_DADDR(mp, rablkno),
1046                                                mp->m_quotainfo->qi_dqchunklen,
1047                                                &xfs_dquot_buf_ops);
1048                                         rablkno++;
1049                                 }
1050                         }
1051                         /*
1052                          * Iterate thru all the blks in the extent and
1053                          * reset the counters of all the dquots inside them.
1054                          */
1055                         error = xfs_qm_reset_dqcounts_all(mp, firstid,
1056                                                    map[i].br_startblock,
1057                                                    map[i].br_blockcount,
1058                                                    flags, buffer_list);
1059                         if (error)
1060                                 goto out;
1061                 }
1062         } while (nmaps > 0);
1063
1064 out:
1065         kmem_free(map);
1066         return error;
1067 }
1068
1069 /*
1070  * Called by dqusage_adjust in doing a quotacheck.
1071  *
1072  * Given the inode, and a dquot id this updates both the incore dqout as well
1073  * as the buffer copy. This is so that once the quotacheck is done, we can
1074  * just log all the buffers, as opposed to logging numerous updates to
1075  * individual dquots.
1076  */
1077 STATIC int
1078 xfs_qm_quotacheck_dqadjust(
1079         struct xfs_inode        *ip,
1080         uint                    type,
1081         xfs_qcnt_t              nblks,
1082         xfs_qcnt_t              rtblks)
1083 {
1084         struct xfs_mount        *mp = ip->i_mount;
1085         struct xfs_dquot        *dqp;
1086         xfs_dqid_t              id;
1087         int                     error;
1088
1089         id = xfs_qm_id_for_quotatype(ip, type);
1090         error = xfs_qm_dqget(mp, id, type, true, &dqp);
1091         if (error) {
1092                 /*
1093                  * Shouldn't be able to turn off quotas here.
1094                  */
1095                 ASSERT(error != -ESRCH);
1096                 ASSERT(error != -ENOENT);
1097                 return error;
1098         }
1099
1100         trace_xfs_dqadjust(dqp);
1101
1102         /*
1103          * Adjust the inode count and the block count to reflect this inode's
1104          * resource usage.
1105          */
1106         be64_add_cpu(&dqp->q_core.d_icount, 1);
1107         dqp->q_res_icount++;
1108         if (nblks) {
1109                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1110                 dqp->q_res_bcount += nblks;
1111         }
1112         if (rtblks) {
1113                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1114                 dqp->q_res_rtbcount += rtblks;
1115         }
1116
1117         /*
1118          * Set default limits, adjust timers (since we changed usages)
1119          *
1120          * There are no timers for the default values set in the root dquot.
1121          */
1122         if (dqp->q_core.d_id) {
1123                 xfs_qm_adjust_dqlimits(mp, dqp);
1124                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1125         }
1126
1127         dqp->dq_flags |= XFS_DQ_DIRTY;
1128         xfs_qm_dqput(dqp);
1129         return 0;
1130 }
1131
1132 /*
1133  * callback routine supplied to bulkstat(). Given an inumber, find its
1134  * dquots and update them to account for resources taken by that inode.
1135  */
1136 /* ARGSUSED */
1137 STATIC int
1138 xfs_qm_dqusage_adjust(
1139         struct xfs_mount        *mp,
1140         struct xfs_trans        *tp,
1141         xfs_ino_t               ino,
1142         void                    *data)
1143 {
1144         struct xfs_inode        *ip;
1145         xfs_qcnt_t              nblks;
1146         xfs_filblks_t           rtblks = 0;     /* total rt blks */
1147         int                     error;
1148
1149         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1150
1151         /*
1152          * rootino must have its resources accounted for, not so with the quota
1153          * inodes.
1154          */
1155         if (xfs_is_quota_inode(&mp->m_sb, ino))
1156                 return 0;
1157
1158         /*
1159          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1160          * at mount time and therefore nobody will be racing chown/chproj.
1161          */
1162         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1163         if (error == -EINVAL || error == -ENOENT)
1164                 return 0;
1165         if (error)
1166                 return error;
1167
1168         ASSERT(ip->i_delayed_blks == 0);
1169
1170         if (XFS_IS_REALTIME_INODE(ip)) {
1171                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1172
1173                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1174                         error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1175                         if (error)
1176                                 goto error0;
1177                 }
1178
1179                 xfs_bmap_count_leaves(ifp, &rtblks);
1180         }
1181
1182         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1183
1184         /*
1185          * Add the (disk blocks and inode) resources occupied by this
1186          * inode to its dquots. We do this adjustment in the incore dquot,
1187          * and also copy the changes to its buffer.
1188          * We don't care about putting these changes in a transaction
1189          * envelope because if we crash in the middle of a 'quotacheck'
1190          * we have to start from the beginning anyway.
1191          * Once we're done, we'll log all the dquot bufs.
1192          *
1193          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1194          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1195          */
1196         if (XFS_IS_UQUOTA_ON(mp)) {
1197                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_USER, nblks,
1198                                 rtblks);
1199                 if (error)
1200                         goto error0;
1201         }
1202
1203         if (XFS_IS_GQUOTA_ON(mp)) {
1204                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_GROUP, nblks,
1205                                 rtblks);
1206                 if (error)
1207                         goto error0;
1208         }
1209
1210         if (XFS_IS_PQUOTA_ON(mp)) {
1211                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_PROJ, nblks,
1212                                 rtblks);
1213                 if (error)
1214                         goto error0;
1215         }
1216
1217 error0:
1218         xfs_irele(ip);
1219         return error;
1220 }
1221
1222 STATIC int
1223 xfs_qm_flush_one(
1224         struct xfs_dquot        *dqp,
1225         void                    *data)
1226 {
1227         struct xfs_mount        *mp = dqp->q_mount;
1228         struct list_head        *buffer_list = data;
1229         struct xfs_buf          *bp = NULL;
1230         int                     error = 0;
1231
1232         xfs_dqlock(dqp);
1233         if (dqp->dq_flags & XFS_DQ_FREEING)
1234                 goto out_unlock;
1235         if (!XFS_DQ_IS_DIRTY(dqp))
1236                 goto out_unlock;
1237
1238         /*
1239          * The only way the dquot is already flush locked by the time quotacheck
1240          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1241          * it for the final time. Quotacheck collects all dquot bufs in the
1242          * local delwri queue before dquots are dirtied, so reclaim can't have
1243          * possibly queued it for I/O. The only way out is to push the buffer to
1244          * cycle the flush lock.
1245          */
1246         if (!xfs_dqflock_nowait(dqp)) {
1247                 /* buf is pinned in-core by delwri list */
1248                 bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1249                                 mp->m_quotainfo->qi_dqchunklen, 0);
1250                 if (!bp) {
1251                         error = -EINVAL;
1252                         goto out_unlock;
1253                 }
1254                 xfs_buf_unlock(bp);
1255
1256                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1257                 xfs_buf_rele(bp);
1258
1259                 error = -EAGAIN;
1260                 goto out_unlock;
1261         }
1262
1263         error = xfs_qm_dqflush(dqp, &bp);
1264         if (error)
1265                 goto out_unlock;
1266
1267         xfs_buf_delwri_queue(bp, buffer_list);
1268         xfs_buf_relse(bp);
1269 out_unlock:
1270         xfs_dqunlock(dqp);
1271         return error;
1272 }
1273
1274 /*
1275  * Walk thru all the filesystem inodes and construct a consistent view
1276  * of the disk quota world. If the quotacheck fails, disable quotas.
1277  */
1278 STATIC int
1279 xfs_qm_quotacheck(
1280         xfs_mount_t     *mp)
1281 {
1282         int                     error, error2;
1283         uint                    flags;
1284         LIST_HEAD               (buffer_list);
1285         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1286         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1287         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1288
1289         flags = 0;
1290
1291         ASSERT(uip || gip || pip);
1292         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1293
1294         xfs_notice(mp, "Quotacheck needed: Please wait.");
1295
1296         /*
1297          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1298          * their counters to zero. We need a clean slate.
1299          * We don't log our changes till later.
1300          */
1301         if (uip) {
1302                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_QMOPT_UQUOTA,
1303                                          &buffer_list);
1304                 if (error)
1305                         goto error_return;
1306                 flags |= XFS_UQUOTA_CHKD;
1307         }
1308
1309         if (gip) {
1310                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_QMOPT_GQUOTA,
1311                                          &buffer_list);
1312                 if (error)
1313                         goto error_return;
1314                 flags |= XFS_GQUOTA_CHKD;
1315         }
1316
1317         if (pip) {
1318                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_QMOPT_PQUOTA,
1319                                          &buffer_list);
1320                 if (error)
1321                         goto error_return;
1322                 flags |= XFS_PQUOTA_CHKD;
1323         }
1324
1325         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1326                         NULL);
1327         if (error)
1328                 goto error_return;
1329
1330         /*
1331          * We've made all the changes that we need to make incore.  Flush them
1332          * down to disk buffers if everything was updated successfully.
1333          */
1334         if (XFS_IS_UQUOTA_ON(mp)) {
1335                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1336                                           &buffer_list);
1337         }
1338         if (XFS_IS_GQUOTA_ON(mp)) {
1339                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1340                                            &buffer_list);
1341                 if (!error)
1342                         error = error2;
1343         }
1344         if (XFS_IS_PQUOTA_ON(mp)) {
1345                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1346                                            &buffer_list);
1347                 if (!error)
1348                         error = error2;
1349         }
1350
1351         error2 = xfs_buf_delwri_submit(&buffer_list);
1352         if (!error)
1353                 error = error2;
1354
1355         /*
1356          * We can get this error if we couldn't do a dquot allocation inside
1357          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1358          * dirty dquots that might be cached, we just want to get rid of them
1359          * and turn quotaoff. The dquots won't be attached to any of the inodes
1360          * at this point (because we intentionally didn't in dqget_noattach).
1361          */
1362         if (error) {
1363                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1364                 goto error_return;
1365         }
1366
1367         /*
1368          * If one type of quotas is off, then it will lose its
1369          * quotachecked status, since we won't be doing accounting for
1370          * that type anymore.
1371          */
1372         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1373         mp->m_qflags |= flags;
1374
1375  error_return:
1376         xfs_buf_delwri_cancel(&buffer_list);
1377
1378         if (error) {
1379                 xfs_warn(mp,
1380         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1381                         error);
1382                 /*
1383                  * We must turn off quotas.
1384                  */
1385                 ASSERT(mp->m_quotainfo != NULL);
1386                 xfs_qm_destroy_quotainfo(mp);
1387                 if (xfs_mount_reset_sbqflags(mp)) {
1388                         xfs_warn(mp,
1389                                 "Quotacheck: Failed to reset quota flags.");
1390                 }
1391         } else
1392                 xfs_notice(mp, "Quotacheck: Done.");
1393         return error;
1394 }
1395
1396 /*
1397  * This is called from xfs_mountfs to start quotas and initialize all
1398  * necessary data structures like quotainfo.  This is also responsible for
1399  * running a quotacheck as necessary.  We are guaranteed that the superblock
1400  * is consistently read in at this point.
1401  *
1402  * If we fail here, the mount will continue with quota turned off. We don't
1403  * need to inidicate success or failure at all.
1404  */
1405 void
1406 xfs_qm_mount_quotas(
1407         struct xfs_mount        *mp)
1408 {
1409         int                     error = 0;
1410         uint                    sbf;
1411
1412         /*
1413          * If quotas on realtime volumes is not supported, we disable
1414          * quotas immediately.
1415          */
1416         if (mp->m_sb.sb_rextents) {
1417                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1418                 mp->m_qflags = 0;
1419                 goto write_changes;
1420         }
1421
1422         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1423
1424         /*
1425          * Allocate the quotainfo structure inside the mount struct, and
1426          * create quotainode(s), and change/rev superblock if necessary.
1427          */
1428         error = xfs_qm_init_quotainfo(mp);
1429         if (error) {
1430                 /*
1431                  * We must turn off quotas.
1432                  */
1433                 ASSERT(mp->m_quotainfo == NULL);
1434                 mp->m_qflags = 0;
1435                 goto write_changes;
1436         }
1437         /*
1438          * If any of the quotas are not consistent, do a quotacheck.
1439          */
1440         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1441                 error = xfs_qm_quotacheck(mp);
1442                 if (error) {
1443                         /* Quotacheck failed and disabled quotas. */
1444                         return;
1445                 }
1446         }
1447         /*
1448          * If one type of quotas is off, then it will lose its
1449          * quotachecked status, since we won't be doing accounting for
1450          * that type anymore.
1451          */
1452         if (!XFS_IS_UQUOTA_ON(mp))
1453                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1454         if (!XFS_IS_GQUOTA_ON(mp))
1455                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1456         if (!XFS_IS_PQUOTA_ON(mp))
1457                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1458
1459  write_changes:
1460         /*
1461          * We actually don't have to acquire the m_sb_lock at all.
1462          * This can only be called from mount, and that's single threaded. XXX
1463          */
1464         spin_lock(&mp->m_sb_lock);
1465         sbf = mp->m_sb.sb_qflags;
1466         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1467         spin_unlock(&mp->m_sb_lock);
1468
1469         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1470                 if (xfs_sync_sb(mp, false)) {
1471                         /*
1472                          * We could only have been turning quotas off.
1473                          * We aren't in very good shape actually because
1474                          * the incore structures are convinced that quotas are
1475                          * off, but the on disk superblock doesn't know that !
1476                          */
1477                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1478                         xfs_alert(mp, "%s: Superblock update failed!",
1479                                 __func__);
1480                 }
1481         }
1482
1483         if (error) {
1484                 xfs_warn(mp, "Failed to initialize disk quotas.");
1485                 return;
1486         }
1487 }
1488
1489 /*
1490  * This is called after the superblock has been read in and we're ready to
1491  * iget the quota inodes.
1492  */
1493 STATIC int
1494 xfs_qm_init_quotainos(
1495         xfs_mount_t     *mp)
1496 {
1497         struct xfs_inode        *uip = NULL;
1498         struct xfs_inode        *gip = NULL;
1499         struct xfs_inode        *pip = NULL;
1500         int                     error;
1501         uint                    flags = 0;
1502
1503         ASSERT(mp->m_quotainfo);
1504
1505         /*
1506          * Get the uquota and gquota inodes
1507          */
1508         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1509                 if (XFS_IS_UQUOTA_ON(mp) &&
1510                     mp->m_sb.sb_uquotino != NULLFSINO) {
1511                         ASSERT(mp->m_sb.sb_uquotino > 0);
1512                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1513                                              0, 0, &uip);
1514                         if (error)
1515                                 return error;
1516                 }
1517                 if (XFS_IS_GQUOTA_ON(mp) &&
1518                     mp->m_sb.sb_gquotino != NULLFSINO) {
1519                         ASSERT(mp->m_sb.sb_gquotino > 0);
1520                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1521                                              0, 0, &gip);
1522                         if (error)
1523                                 goto error_rele;
1524                 }
1525                 if (XFS_IS_PQUOTA_ON(mp) &&
1526                     mp->m_sb.sb_pquotino != NULLFSINO) {
1527                         ASSERT(mp->m_sb.sb_pquotino > 0);
1528                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1529                                              0, 0, &pip);
1530                         if (error)
1531                                 goto error_rele;
1532                 }
1533         } else {
1534                 flags |= XFS_QMOPT_SBVERSION;
1535         }
1536
1537         /*
1538          * Create the three inodes, if they don't exist already. The changes
1539          * made above will get added to a transaction and logged in one of
1540          * the qino_alloc calls below.  If the device is readonly,
1541          * temporarily switch to read-write to do this.
1542          */
1543         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1544                 error = xfs_qm_qino_alloc(mp, &uip,
1545                                               flags | XFS_QMOPT_UQUOTA);
1546                 if (error)
1547                         goto error_rele;
1548
1549                 flags &= ~XFS_QMOPT_SBVERSION;
1550         }
1551         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1552                 error = xfs_qm_qino_alloc(mp, &gip,
1553                                           flags | XFS_QMOPT_GQUOTA);
1554                 if (error)
1555                         goto error_rele;
1556
1557                 flags &= ~XFS_QMOPT_SBVERSION;
1558         }
1559         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1560                 error = xfs_qm_qino_alloc(mp, &pip,
1561                                           flags | XFS_QMOPT_PQUOTA);
1562                 if (error)
1563                         goto error_rele;
1564         }
1565
1566         mp->m_quotainfo->qi_uquotaip = uip;
1567         mp->m_quotainfo->qi_gquotaip = gip;
1568         mp->m_quotainfo->qi_pquotaip = pip;
1569
1570         return 0;
1571
1572 error_rele:
1573         if (uip)
1574                 xfs_irele(uip);
1575         if (gip)
1576                 xfs_irele(gip);
1577         if (pip)
1578                 xfs_irele(pip);
1579         return error;
1580 }
1581
1582 STATIC void
1583 xfs_qm_destroy_quotainos(
1584         xfs_quotainfo_t *qi)
1585 {
1586         if (qi->qi_uquotaip) {
1587                 xfs_irele(qi->qi_uquotaip);
1588                 qi->qi_uquotaip = NULL; /* paranoia */
1589         }
1590         if (qi->qi_gquotaip) {
1591                 xfs_irele(qi->qi_gquotaip);
1592                 qi->qi_gquotaip = NULL;
1593         }
1594         if (qi->qi_pquotaip) {
1595                 xfs_irele(qi->qi_pquotaip);
1596                 qi->qi_pquotaip = NULL;
1597         }
1598 }
1599
1600 STATIC void
1601 xfs_qm_dqfree_one(
1602         struct xfs_dquot        *dqp)
1603 {
1604         struct xfs_mount        *mp = dqp->q_mount;
1605         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1606
1607         mutex_lock(&qi->qi_tree_lock);
1608         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1609                           be32_to_cpu(dqp->q_core.d_id));
1610
1611         qi->qi_dquots--;
1612         mutex_unlock(&qi->qi_tree_lock);
1613
1614         xfs_qm_dqdestroy(dqp);
1615 }
1616
1617 /* --------------- utility functions for vnodeops ---------------- */
1618
1619
1620 /*
1621  * Given an inode, a uid, gid and prid make sure that we have
1622  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1623  * quotas by creating this file.
1624  * This also attaches dquot(s) to the given inode after locking it,
1625  * and returns the dquots corresponding to the uid and/or gid.
1626  *
1627  * in   : inode (unlocked)
1628  * out  : udquot, gdquot with references taken and unlocked
1629  */
1630 int
1631 xfs_qm_vop_dqalloc(
1632         struct xfs_inode        *ip,
1633         kuid_t                  uid,
1634         kgid_t                  gid,
1635         prid_t                  prid,
1636         uint                    flags,
1637         struct xfs_dquot        **O_udqpp,
1638         struct xfs_dquot        **O_gdqpp,
1639         struct xfs_dquot        **O_pdqpp)
1640 {
1641         struct xfs_mount        *mp = ip->i_mount;
1642         struct inode            *inode = VFS_I(ip);
1643         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1644         struct xfs_dquot        *uq = NULL;
1645         struct xfs_dquot        *gq = NULL;
1646         struct xfs_dquot        *pq = NULL;
1647         int                     error;
1648         uint                    lockflags;
1649
1650         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1651                 return 0;
1652
1653         lockflags = XFS_ILOCK_EXCL;
1654         xfs_ilock(ip, lockflags);
1655
1656         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1657                 gid = inode->i_gid;
1658
1659         /*
1660          * Attach the dquot(s) to this inode, doing a dquot allocation
1661          * if necessary. The dquot(s) will not be locked.
1662          */
1663         if (XFS_NOT_DQATTACHED(mp, ip)) {
1664                 error = xfs_qm_dqattach_locked(ip, true);
1665                 if (error) {
1666                         xfs_iunlock(ip, lockflags);
1667                         return error;
1668                 }
1669         }
1670
1671         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1672                 if (!uid_eq(inode->i_uid, uid)) {
1673                         /*
1674                          * What we need is the dquot that has this uid, and
1675                          * if we send the inode to dqget, the uid of the inode
1676                          * takes priority over what's sent in the uid argument.
1677                          * We must unlock inode here before calling dqget if
1678                          * we're not sending the inode, because otherwise
1679                          * we'll deadlock by doing trans_reserve while
1680                          * holding ilock.
1681                          */
1682                         xfs_iunlock(ip, lockflags);
1683                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1684                                         XFS_DQ_USER, true, &uq);
1685                         if (error) {
1686                                 ASSERT(error != -ENOENT);
1687                                 return error;
1688                         }
1689                         /*
1690                          * Get the ilock in the right order.
1691                          */
1692                         xfs_dqunlock(uq);
1693                         lockflags = XFS_ILOCK_SHARED;
1694                         xfs_ilock(ip, lockflags);
1695                 } else {
1696                         /*
1697                          * Take an extra reference, because we'll return
1698                          * this to caller
1699                          */
1700                         ASSERT(ip->i_udquot);
1701                         uq = xfs_qm_dqhold(ip->i_udquot);
1702                 }
1703         }
1704         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1705                 if (!gid_eq(inode->i_gid, gid)) {
1706                         xfs_iunlock(ip, lockflags);
1707                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1708                                         XFS_DQ_GROUP, true, &gq);
1709                         if (error) {
1710                                 ASSERT(error != -ENOENT);
1711                                 goto error_rele;
1712                         }
1713                         xfs_dqunlock(gq);
1714                         lockflags = XFS_ILOCK_SHARED;
1715                         xfs_ilock(ip, lockflags);
1716                 } else {
1717                         ASSERT(ip->i_gdquot);
1718                         gq = xfs_qm_dqhold(ip->i_gdquot);
1719                 }
1720         }
1721         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1722                 if (ip->i_d.di_projid != prid) {
1723                         xfs_iunlock(ip, lockflags);
1724                         error = xfs_qm_dqget(mp, (xfs_dqid_t)prid, XFS_DQ_PROJ,
1725                                         true, &pq);
1726                         if (error) {
1727                                 ASSERT(error != -ENOENT);
1728                                 goto error_rele;
1729                         }
1730                         xfs_dqunlock(pq);
1731                         lockflags = XFS_ILOCK_SHARED;
1732                         xfs_ilock(ip, lockflags);
1733                 } else {
1734                         ASSERT(ip->i_pdquot);
1735                         pq = xfs_qm_dqhold(ip->i_pdquot);
1736                 }
1737         }
1738         if (uq)
1739                 trace_xfs_dquot_dqalloc(ip);
1740
1741         xfs_iunlock(ip, lockflags);
1742         if (O_udqpp)
1743                 *O_udqpp = uq;
1744         else
1745                 xfs_qm_dqrele(uq);
1746         if (O_gdqpp)
1747                 *O_gdqpp = gq;
1748         else
1749                 xfs_qm_dqrele(gq);
1750         if (O_pdqpp)
1751                 *O_pdqpp = pq;
1752         else
1753                 xfs_qm_dqrele(pq);
1754         return 0;
1755
1756 error_rele:
1757         xfs_qm_dqrele(gq);
1758         xfs_qm_dqrele(uq);
1759         return error;
1760 }
1761
1762 /*
1763  * Actually transfer ownership, and do dquot modifications.
1764  * These were already reserved.
1765  */
1766 struct xfs_dquot *
1767 xfs_qm_vop_chown(
1768         struct xfs_trans        *tp,
1769         struct xfs_inode        *ip,
1770         struct xfs_dquot        **IO_olddq,
1771         struct xfs_dquot        *newdq)
1772 {
1773         struct xfs_dquot        *prevdq;
1774         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1775                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1776
1777
1778         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1779         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1780
1781         /* old dquot */
1782         prevdq = *IO_olddq;
1783         ASSERT(prevdq);
1784         ASSERT(prevdq != newdq);
1785
1786         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1787         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1788
1789         /* the sparkling new dquot */
1790         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1791         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1792
1793         /*
1794          * Take an extra reference, because the inode is going to keep
1795          * this dquot pointer even after the trans_commit.
1796          */
1797         *IO_olddq = xfs_qm_dqhold(newdq);
1798
1799         return prevdq;
1800 }
1801
1802 /*
1803  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1804  */
1805 int
1806 xfs_qm_vop_chown_reserve(
1807         struct xfs_trans        *tp,
1808         struct xfs_inode        *ip,
1809         struct xfs_dquot        *udqp,
1810         struct xfs_dquot        *gdqp,
1811         struct xfs_dquot        *pdqp,
1812         uint                    flags)
1813 {
1814         struct xfs_mount        *mp = ip->i_mount;
1815         uint64_t                delblks;
1816         unsigned int            blkflags, prjflags = 0;
1817         struct xfs_dquot        *udq_unres = NULL;
1818         struct xfs_dquot        *gdq_unres = NULL;
1819         struct xfs_dquot        *pdq_unres = NULL;
1820         struct xfs_dquot        *udq_delblks = NULL;
1821         struct xfs_dquot        *gdq_delblks = NULL;
1822         struct xfs_dquot        *pdq_delblks = NULL;
1823         int                     error;
1824
1825
1826         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1827         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1828
1829         delblks = ip->i_delayed_blks;
1830         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1831                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1832
1833         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1834             i_uid_read(VFS_I(ip)) != be32_to_cpu(udqp->q_core.d_id)) {
1835                 udq_delblks = udqp;
1836                 /*
1837                  * If there are delayed allocation blocks, then we have to
1838                  * unreserve those from the old dquot, and add them to the
1839                  * new dquot.
1840                  */
1841                 if (delblks) {
1842                         ASSERT(ip->i_udquot);
1843                         udq_unres = ip->i_udquot;
1844                 }
1845         }
1846         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1847             i_gid_read(VFS_I(ip)) != be32_to_cpu(gdqp->q_core.d_id)) {
1848                 gdq_delblks = gdqp;
1849                 if (delblks) {
1850                         ASSERT(ip->i_gdquot);
1851                         gdq_unres = ip->i_gdquot;
1852                 }
1853         }
1854
1855         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1856             ip->i_d.di_projid != be32_to_cpu(pdqp->q_core.d_id)) {
1857                 prjflags = XFS_QMOPT_ENOSPC;
1858                 pdq_delblks = pdqp;
1859                 if (delblks) {
1860                         ASSERT(ip->i_pdquot);
1861                         pdq_unres = ip->i_pdquot;
1862                 }
1863         }
1864
1865         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1866                                 udq_delblks, gdq_delblks, pdq_delblks,
1867                                 ip->i_d.di_nblocks, 1,
1868                                 flags | blkflags | prjflags);
1869         if (error)
1870                 return error;
1871
1872         /*
1873          * Do the delayed blks reservations/unreservations now. Since, these
1874          * are done without the help of a transaction, if a reservation fails
1875          * its previous reservations won't be automatically undone by trans
1876          * code. So, we have to do it manually here.
1877          */
1878         if (delblks) {
1879                 /*
1880                  * Do the reservations first. Unreservation can't fail.
1881                  */
1882                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1883                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1884                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1885                             udq_delblks, gdq_delblks, pdq_delblks,
1886                             (xfs_qcnt_t)delblks, 0,
1887                             flags | blkflags | prjflags);
1888                 if (error)
1889                         return error;
1890                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1891                                 udq_unres, gdq_unres, pdq_unres,
1892                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1893         }
1894
1895         return 0;
1896 }
1897
1898 int
1899 xfs_qm_vop_rename_dqattach(
1900         struct xfs_inode        **i_tab)
1901 {
1902         struct xfs_mount        *mp = i_tab[0]->i_mount;
1903         int                     i;
1904
1905         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1906                 return 0;
1907
1908         for (i = 0; (i < 4 && i_tab[i]); i++) {
1909                 struct xfs_inode        *ip = i_tab[i];
1910                 int                     error;
1911
1912                 /*
1913                  * Watch out for duplicate entries in the table.
1914                  */
1915                 if (i == 0 || ip != i_tab[i-1]) {
1916                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1917                                 error = xfs_qm_dqattach(ip);
1918                                 if (error)
1919                                         return error;
1920                         }
1921                 }
1922         }
1923         return 0;
1924 }
1925
1926 void
1927 xfs_qm_vop_create_dqattach(
1928         struct xfs_trans        *tp,
1929         struct xfs_inode        *ip,
1930         struct xfs_dquot        *udqp,
1931         struct xfs_dquot        *gdqp,
1932         struct xfs_dquot        *pdqp)
1933 {
1934         struct xfs_mount        *mp = tp->t_mountp;
1935
1936         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1937                 return;
1938
1939         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1940         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1941
1942         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1943                 ASSERT(ip->i_udquot == NULL);
1944                 ASSERT(i_uid_read(VFS_I(ip)) == be32_to_cpu(udqp->q_core.d_id));
1945
1946                 ip->i_udquot = xfs_qm_dqhold(udqp);
1947                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1948         }
1949         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1950                 ASSERT(ip->i_gdquot == NULL);
1951                 ASSERT(i_gid_read(VFS_I(ip)) == be32_to_cpu(gdqp->q_core.d_id));
1952
1953                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1954                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1955         }
1956         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1957                 ASSERT(ip->i_pdquot == NULL);
1958                 ASSERT(ip->i_d.di_projid == be32_to_cpu(pdqp->q_core.d_id));
1959
1960                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1961                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1962         }
1963 }
1964