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
 125         xfs_dqlock(dqp);
 126         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 127                 xfs_dqunlock(dqp);
 128                 return -EAGAIN;
 129         }
 130
 131         dqp->dq_flags |= XFS_DQ_FREEING;
 132
 133         xfs_dqflock(dqp);
 134
 135         /*
 136          * If we are turning this type of quotas off, we don't care
 137          * about the dirty metadata sitting in this dquot. OTOH, if
 138          * we're unmounting, we do care, so we flush it and wait.
 139          */
 140         if (XFS_DQ_IS_DIRTY(dqp)) {
 141                 struct xfs_buf  *bp = NULL;
 142                 int             error;
 143
 144                 /*
 145                  * We don't care about getting disk errors here. We need
 146                  * to purge this dquot anyway, so we go ahead regardless.
 147                  */
 148                 error = xfs_qm_dqflush(dqp, &bp);
 149                 if (!error) {
 150                         error = xfs_bwrite(bp);
 151                         xfs_buf_relse(bp);
 152                 }
 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
 179 /*
 180  * Purge the dquot cache.
 181  */
 182 void
 183 xfs_qm_dqpurge_all(
 184         struct xfs_mount        *mp,
 185         uint                    flags)
 186 {
 187         if (flags & XFS_QMOPT_UQUOTA)
 188                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 189         if (flags & XFS_QMOPT_GQUOTA)
 190                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 191         if (flags & XFS_QMOPT_PQUOTA)
 192                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 193 }
 194
 195 /*
 196  * Just destroy the quotainfo structure.
 197  */
 198 void
 199 xfs_qm_unmount(
 200         struct xfs_mount        *mp)
 201 {
 202         if (mp->m_quotainfo) {
 203                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 204                 xfs_qm_destroy_quotainfo(mp);
 205         }
 206 }
 207
 208 /*
 209  * Called from the vfsops layer.
 210  */
 211 void
 212 xfs_qm_unmount_quotas(
 213         xfs_mount_t     *mp)
 214 {
 215         /*
 216          * Release the dquots that root inode, et al might be holding,
 217          * before we flush quotas and blow away the quotainfo structure.
 218          */
 219         ASSERT(mp->m_rootip);
 220         xfs_qm_dqdetach(mp->m_rootip);
 221         if (mp->m_rbmip)
 222                 xfs_qm_dqdetach(mp->m_rbmip);
 223         if (mp->m_rsumip)
 224                 xfs_qm_dqdetach(mp->m_rsumip);
 225
 226         /*
 227          * Release the quota inodes.
 228          */
 229         if (mp->m_quotainfo) {
 230                 if (mp->m_quotainfo->qi_uquotaip) {
 231                         xfs_irele(mp->m_quotainfo->qi_uquotaip);
 232                         mp->m_quotainfo->qi_uquotaip = NULL;
 233                 }
 234                 if (mp->m_quotainfo->qi_gquotaip) {
 235                         xfs_irele(mp->m_quotainfo->qi_gquotaip);
 236                         mp->m_quotainfo->qi_gquotaip = NULL;
 237                 }
 238                 if (mp->m_quotainfo->qi_pquotaip) {
 239                         xfs_irele(mp->m_quotainfo->qi_pquotaip);
 240                         mp->m_quotainfo->qi_pquotaip = NULL;
 241                 }
 242         }
 243 }
 244
 245 STATIC int
 246 xfs_qm_dqattach_one(
 247         struct xfs_inode        *ip,
 248         xfs_dqid_t              id,
 249         uint                    type,
 250         bool                    doalloc,
 251         struct xfs_dquot        **IO_idqpp)
 252 {
 253         struct xfs_dquot        *dqp;
 254         int                     error;
 255
 256         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 257         error = 0;
 258
 259         /*
 260          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 261          * or &i_gdquot. This made the code look weird, but made the logic a lot
 262          * simpler.
 263          */
 264         dqp = *IO_idqpp;
 265         if (dqp) {
 266                 trace_xfs_dqattach_found(dqp);
 267                 return 0;
 268         }
 269
 270         /*
 271          * Find the dquot from somewhere. This bumps the reference count of
 272          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 273          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 274          * turned off suddenly.
 275          */
 276         error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
 277         if (error)
 278                 return error;
 279
 280         trace_xfs_dqattach_get(dqp);
 281
 282         /*
 283          * dqget may have dropped and re-acquired the ilock, but it guarantees
 284          * that the dquot returned is the one that should go in the inode.
 285          */
 286         *IO_idqpp = dqp;
 287         xfs_dqunlock(dqp);
 288         return 0;
 289 }
 290
 291 static bool
 292 xfs_qm_need_dqattach(
 293         struct xfs_inode        *ip)
 294 {
 295         struct xfs_mount        *mp = ip->i_mount;
 296
 297         if (!XFS_IS_QUOTA_RUNNING(mp))
 298                 return false;
 299         if (!XFS_IS_QUOTA_ON(mp))
 300                 return false;
 301         if (!XFS_NOT_DQATTACHED(mp, ip))
 302                 return false;
 303         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 304                 return false;
 305         return true;
 306 }
 307
 308 /*
 309  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 310  * into account.
 311  * If @doalloc is true, the dquot(s) will be allocated if needed.
 312  * Inode may get unlocked and relocked in here, and the caller must deal with
 313  * the consequences.
 314  */
 315 int
 316 xfs_qm_dqattach_locked(
 317         xfs_inode_t     *ip,
 318         bool            doalloc)
 319 {
 320         xfs_mount_t     *mp = ip->i_mount;
 321         int             error = 0;
 322
 323         if (!xfs_qm_need_dqattach(ip))
 324                 return 0;
 325
 326         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 327
 328         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 329                 error = xfs_qm_dqattach_one(ip, i_uid_read(VFS_I(ip)),
 330                                 XFS_DQ_USER, doalloc, &ip->i_udquot);
 331                 if (error)
 332                         goto done;
 333                 ASSERT(ip->i_udquot);
 334         }
 335
 336         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 337                 error = xfs_qm_dqattach_one(ip, i_gid_read(VFS_I(ip)),
 338                                 XFS_DQ_GROUP, doalloc, &ip->i_gdquot);
 339                 if (error)
 340                         goto done;
 341                 ASSERT(ip->i_gdquot);
 342         }
 343
 344         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 345                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
 346                                 doalloc, &ip->i_pdquot);
 347                 if (error)
 348                         goto done;
 349                 ASSERT(ip->i_pdquot);
 350         }
 351
 352 done:
 353         /*
 354          * Don't worry about the dquots that we may have attached before any
 355          * error - they'll get detached later if it has not already been done.
 356          */
 357         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 358         return error;
 359 }
 360
 361 int
 362 xfs_qm_dqattach(
 363         struct xfs_inode        *ip)
 364 {
 365         int                     error;
 366
 367         if (!xfs_qm_need_dqattach(ip))
 368                 return 0;
 369
 370         xfs_ilock(ip, XFS_ILOCK_EXCL);
 371         error = xfs_qm_dqattach_locked(ip, false);
 372         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 373
 374         return error;
 375 }
 376
 377 /*
 378  * Release dquots (and their references) if any.
 379  * The inode should be locked EXCL except when this's called by
 380  * xfs_ireclaim.
 381  */
 382 void
 383 xfs_qm_dqdetach(
 384         xfs_inode_t     *ip)
 385 {
 386         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 387                 return;
 388
 389         trace_xfs_dquot_dqdetach(ip);
 390
 391         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 392         if (ip->i_udquot) {
 393                 xfs_qm_dqrele(ip->i_udquot);
 394                 ip->i_udquot = NULL;
 395         }
 396         if (ip->i_gdquot) {
 397                 xfs_qm_dqrele(ip->i_gdquot);
 398                 ip->i_gdquot = NULL;
 399         }
 400         if (ip->i_pdquot) {
 401                 xfs_qm_dqrele(ip->i_pdquot);
 402                 ip->i_pdquot = NULL;
 403         }
 404 }
 405
 406 struct xfs_qm_isolate {
 407         struct list_head        buffers;
 408         struct list_head        dispose;
 409 };
 410
 411 static enum lru_status
 412 xfs_qm_dquot_isolate(
 413         struct list_head        *item,
 414         struct list_lru_one     *lru,
 415         spinlock_t              *lru_lock,
 416         void                    *arg)
 417                 __releases(lru_lock) __acquires(lru_lock)
 418 {
 419         struct xfs_dquot        *dqp = container_of(item,
 420                                                 struct xfs_dquot, q_lru);
 421         struct xfs_qm_isolate   *isol = arg;
 422
 423         if (!xfs_dqlock_nowait(dqp))
 424                 goto out_miss_busy;
 425
 426         /*
 427          * This dquot has acquired a reference in the meantime remove it from
 428          * the freelist and try again.
 429          */
 430         if (dqp->q_nrefs) {
 431                 xfs_dqunlock(dqp);
 432                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 433
 434                 trace_xfs_dqreclaim_want(dqp);
 435                 list_lru_isolate(lru, &dqp->q_lru);
 436                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 437                 return LRU_REMOVED;
 438         }
 439
 440         /*
 441          * If the dquot is dirty, flush it. If it's already being flushed, just
 442          * skip it so there is time for the IO to complete before we try to
 443          * reclaim it again on the next LRU pass.
 444          */
 445         if (!xfs_dqflock_nowait(dqp)) {
 446                 xfs_dqunlock(dqp);
 447                 goto out_miss_busy;
 448         }
 449
 450         if (XFS_DQ_IS_DIRTY(dqp)) {
 451                 struct xfs_buf  *bp = NULL;
 452                 int             error;
 453
 454                 trace_xfs_dqreclaim_dirty(dqp);
 455
 456                 /* we have to drop the LRU lock to flush the dquot */
 457                 spin_unlock(lru_lock);
 458
 459                 error = xfs_qm_dqflush(dqp, &bp);
 460                 if (error)
 461                         goto out_unlock_dirty;
 462
 463                 xfs_buf_delwri_queue(bp, &isol->buffers);
 464                 xfs_buf_relse(bp);
 465                 goto out_unlock_dirty;
 466         }
 467         xfs_dqfunlock(dqp);
 468
 469         /*
 470          * Prevent lookups now that we are past the point of no return.
 471          */
 472         dqp->dq_flags |= XFS_DQ_FREEING;
 473         xfs_dqunlock(dqp);
 474
 475         ASSERT(dqp->q_nrefs == 0);
 476         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 477         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 478         trace_xfs_dqreclaim_done(dqp);
 479         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 480         return LRU_REMOVED;
 481
 482 out_miss_busy:
 483         trace_xfs_dqreclaim_busy(dqp);
 484         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 485         return LRU_SKIP;
 486
 487 out_unlock_dirty:
 488         trace_xfs_dqreclaim_busy(dqp);
 489         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 490         xfs_dqunlock(dqp);
 491         spin_lock(lru_lock);
 492         return LRU_RETRY;
 493 }
 494
 495 static unsigned long
 496 xfs_qm_shrink_scan(
 497         struct shrinker         *shrink,
 498         struct shrink_control   *sc)
 499 {
 500         struct xfs_quotainfo    *qi = container_of(shrink,
 501                                         struct xfs_quotainfo, qi_shrinker);
 502         struct xfs_qm_isolate   isol;
 503         unsigned long           freed;
 504         int                     error;
 505
 506         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 507                 return 0;
 508
 509         INIT_LIST_HEAD(&isol.buffers);
 510         INIT_LIST_HEAD(&isol.dispose);
 511
 512         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 513                                      xfs_qm_dquot_isolate, &isol);
 514
 515         error = xfs_buf_delwri_submit(&isol.buffers);
 516         if (error)
 517                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 518
 519         while (!list_empty(&isol.dispose)) {
 520                 struct xfs_dquot        *dqp;
 521
 522                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 523                 list_del_init(&dqp->q_lru);
 524                 xfs_qm_dqfree_one(dqp);
 525         }
 526
 527         return freed;
 528 }
 529
 530 static unsigned long
 531 xfs_qm_shrink_count(
 532         struct shrinker         *shrink,
 533         struct shrink_control   *sc)
 534 {
 535         struct xfs_quotainfo    *qi = container_of(shrink,
 536                                         struct xfs_quotainfo, qi_shrinker);
 537
 538         return list_lru_shrink_count(&qi->qi_lru, sc);
 539 }
 540
 541 STATIC void
 542 xfs_qm_set_defquota(
 543         struct xfs_mount        *mp,
 544         uint                    type,
 545         struct xfs_quotainfo    *qinf)
 546 {
 547         struct xfs_dquot        *dqp;
 548         struct xfs_def_quota    *defq;
 549         struct xfs_disk_dquot   *ddqp;
 550         int                     error;
 551
 552         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 553         if (error)
 554                 return;
 555
 556         ddqp = &dqp->q_core;
 557         defq = xfs_get_defquota(dqp, qinf);
 558
 559         /*
 560          * Timers and warnings have been already set, let's just set the
 561          * default limits for this quota type
 562          */
 563         defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 564         defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 565         defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 566         defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 567         defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 568         defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 569         xfs_qm_dqdestroy(dqp);
 570 }
 571
 572 /* Initialize quota time limits from the root dquot. */
 573 static void
 574 xfs_qm_init_timelimits(
 575         struct xfs_mount        *mp,
 576         struct xfs_quotainfo    *qinf)
 577 {
 578         struct xfs_disk_dquot   *ddqp;
 579         struct xfs_dquot        *dqp;
 580         uint                    type;
 581         int                     error;
 582
 583         qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 584         qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 585         qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 586         qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 587         qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 588         qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 589
 590         /*
 591          * We try to get the limits from the superuser's limits fields.
 592          * This is quite hacky, but it is standard quota practice.
 593          *
 594          * Since we may not have done a quotacheck by this point, just read
 595          * the dquot without attaching it to any hashtables or lists.
 596          *
 597          * Timers and warnings are globally set by the first timer found in
 598          * user/group/proj quota types, otherwise a default value is used.
 599          * This should be split into different fields per quota type.
 600          */
 601         if (XFS_IS_UQUOTA_RUNNING(mp))
 602                 type = XFS_DQ_USER;
 603         else if (XFS_IS_GQUOTA_RUNNING(mp))
 604                 type = XFS_DQ_GROUP;
 605         else
 606                 type = XFS_DQ_PROJ;
 607         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 608         if (error)
 609                 return;
 610
 611         ddqp = &dqp->q_core;
 612         /*
 613          * The warnings and timers set the grace period given to
 614          * a user or group before he or she can not perform any
 615          * more writing. If it is zero, a default is used.
 616          */
 617         if (ddqp->d_btimer)
 618                 qinf->qi_btimelimit = be32_to_cpu(ddqp->d_btimer);
 619         if (ddqp->d_itimer)
 620                 qinf->qi_itimelimit = be32_to_cpu(ddqp->d_itimer);
 621         if (ddqp->d_rtbtimer)
 622                 qinf->qi_rtbtimelimit = be32_to_cpu(ddqp->d_rtbtimer);
 623         if (ddqp->d_bwarns)
 624                 qinf->qi_bwarnlimit = be16_to_cpu(ddqp->d_bwarns);
 625         if (ddqp->d_iwarns)
 626                 qinf->qi_iwarnlimit = be16_to_cpu(ddqp->d_iwarns);
 627         if (ddqp->d_rtbwarns)
 628                 qinf->qi_rtbwarnlimit = be16_to_cpu(ddqp->d_rtbwarns);
 629
 630         xfs_qm_dqdestroy(dqp);
 631 }
 632
 633 /*
 634  * This initializes all the quota information that's kept in the
 635  * mount structure
 636  */
 637 STATIC int
 638 xfs_qm_init_quotainfo(
 639         struct xfs_mount        *mp)
 640 {
 641         struct xfs_quotainfo    *qinf;
 642         int                     error;
 643
 644         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 645
 646         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
 647
 648         error = list_lru_init(&qinf->qi_lru);
 649         if (error)
 650                 goto out_free_qinf;
 651
 652         /*
 653          * See if quotainodes are setup, and if not, allocate them,
 654          * and change the superblock accordingly.
 655          */
 656         error = xfs_qm_init_quotainos(mp);
 657         if (error)
 658                 goto out_free_lru;
 659
 660         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 661         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 662         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 663         mutex_init(&qinf->qi_tree_lock);
 664
 665         /* mutex used to serialize quotaoffs */
 666         mutex_init(&qinf->qi_quotaofflock);
 667
 668         /* Precalc some constants */
 669         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 670         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 671
 672         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 673
 674         xfs_qm_init_timelimits(mp, qinf);
 675
 676         if (XFS_IS_UQUOTA_RUNNING(mp))
 677                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 678         if (XFS_IS_GQUOTA_RUNNING(mp))
 679                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 680         if (XFS_IS_PQUOTA_RUNNING(mp))
 681                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 682
 683         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 684         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 685         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 686         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 687
 688         error = register_shrinker(&qinf->qi_shrinker);
 689         if (error)
 690                 goto out_free_inos;
 691
 692         return 0;
 693
 694 out_free_inos:
 695         mutex_destroy(&qinf->qi_quotaofflock);
 696         mutex_destroy(&qinf->qi_tree_lock);
 697         xfs_qm_destroy_quotainos(qinf);
 698 out_free_lru:
 699         list_lru_destroy(&qinf->qi_lru);
 700 out_free_qinf:
 701         kmem_free(qinf);
 702         mp->m_quotainfo = NULL;
 703         return error;
 704 }
 705
 706 /*
 707  * Gets called when unmounting a filesystem or when all quotas get
 708  * turned off.
 709  * This purges the quota inodes, destroys locks and frees itself.
 710  */
 711 void
 712 xfs_qm_destroy_quotainfo(
 713         struct xfs_mount        *mp)
 714 {
 715         struct xfs_quotainfo    *qi;
 716
 717         qi = mp->m_quotainfo;
 718         ASSERT(qi != NULL);
 719
 720         unregister_shrinker(&qi->qi_shrinker);
 721         list_lru_destroy(&qi->qi_lru);
 722         xfs_qm_destroy_quotainos(qi);
 723         mutex_destroy(&qi->qi_tree_lock);
 724         mutex_destroy(&qi->qi_quotaofflock);
 725         kmem_free(qi);
 726         mp->m_quotainfo = NULL;
 727 }
 728
 729 /*
 730  * Create an inode and return with a reference already taken, but unlocked
 731  * This is how we create quota inodes
 732  */
 733 STATIC int
 734 xfs_qm_qino_alloc(
 735         xfs_mount_t     *mp,
 736         xfs_inode_t     **ip,
 737         uint            flags)
 738 {
 739         xfs_trans_t     *tp;
 740         int             error;
 741         bool            need_alloc = true;
 742
 743         *ip = NULL;
 744         /*
 745          * With superblock that doesn't have separate pquotino, we
 746          * share an inode between gquota and pquota. If the on-disk
 747          * superblock has GQUOTA and the filesystem is now mounted
 748          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 749          * vice-versa.
 750          */
 751         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 752                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 753                 xfs_ino_t ino = NULLFSINO;
 754
 755                 if ((flags & XFS_QMOPT_PQUOTA) &&
 756                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 757                         ino = mp->m_sb.sb_gquotino;
 758                         if (XFS_IS_CORRUPT(mp,
 759                                            mp->m_sb.sb_pquotino != NULLFSINO))
 760                                 return -EFSCORRUPTED;
 761                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 762                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 763                         ino = mp->m_sb.sb_pquotino;
 764                         if (XFS_IS_CORRUPT(mp,
 765                                            mp->m_sb.sb_gquotino != NULLFSINO))
 766                                 return -EFSCORRUPTED;
 767                 }
 768                 if (ino != NULLFSINO) {
 769                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 770                         if (error)
 771                                 return error;
 772                         mp->m_sb.sb_gquotino = NULLFSINO;
 773                         mp->m_sb.sb_pquotino = NULLFSINO;
 774                         need_alloc = false;
 775                 }
 776         }
 777
 778         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 779                         XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 780         if (error)
 781                 return error;
 782
 783         if (need_alloc) {
 784                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
 785                 if (error) {
 786                         xfs_trans_cancel(tp);
 787                         return error;
 788                 }
 789         }
 790
 791         /*
 792          * Make the changes in the superblock, and log those too.
 793          * sbfields arg may contain fields other than *QUOTINO;
 794          * VERSIONNUM for example.
 795          */
 796         spin_lock(&mp->m_sb_lock);
 797         if (flags & XFS_QMOPT_SBVERSION) {
 798                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 799
 800                 xfs_sb_version_addquota(&mp->m_sb);
 801                 mp->m_sb.sb_uquotino = NULLFSINO;
 802                 mp->m_sb.sb_gquotino = NULLFSINO;
 803                 mp->m_sb.sb_pquotino = NULLFSINO;
 804
 805                 /* qflags will get updated fully _after_ quotacheck */
 806                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 807         }
 808         if (flags & XFS_QMOPT_UQUOTA)
 809                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 810         else if (flags & XFS_QMOPT_GQUOTA)
 811                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 812         else
 813                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 814         spin_unlock(&mp->m_sb_lock);
 815         xfs_log_sb(tp);
 816
 817         error = xfs_trans_commit(tp);
 818         if (error) {
 819                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 820                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 821         }
 822         if (need_alloc)
 823                 xfs_finish_inode_setup(*ip);
 824         return error;
 825 }
 826
 827
 828 STATIC void
 829 xfs_qm_reset_dqcounts(
 830         xfs_mount_t     *mp,
 831         xfs_buf_t       *bp,
 832         xfs_dqid_t      id,
 833         uint            type)
 834 {
 835         struct xfs_dqblk        *dqb;
 836         int                     j;
 837         xfs_failaddr_t          fa;
 838
 839         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 840
 841         /*
 842          * Reset all counters and timers. They'll be
 843          * started afresh by xfs_qm_quotacheck.
 844          */
 845 #ifdef DEBUG
 846         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 847                 sizeof(xfs_dqblk_t);
 848         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 849 #endif
 850         dqb = bp->b_addr;
 851         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 852                 struct xfs_disk_dquot   *ddq;
 853
 854                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 855
 856                 /*
 857                  * Do a sanity check, and if needed, repair the dqblk. Don't
 858                  * output any warnings because it's perfectly possible to
 859                  * find uninitialised dquot blks. See comment in
 860                  * xfs_dquot_verify.
 861                  */
 862                 fa = xfs_dqblk_verify(mp, &dqb[j], id + j, type);
 863                 if (fa)
 864                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 865
 866                 /*
 867                  * Reset type in case we are reusing group quota file for
 868                  * project quotas or vice versa
 869                  */
 870                 ddq->d_flags = type;
 871                 ddq->d_bcount = 0;
 872                 ddq->d_icount = 0;
 873                 ddq->d_rtbcount = 0;
 874
 875                 /*
 876                  * dquot id 0 stores the default grace period and the maximum
 877                  * warning limit that were set by the administrator, so we
 878                  * should not reset them.
 879                  */
 880                 if (ddq->d_id != 0) {
 881                         ddq->d_btimer = 0;
 882                         ddq->d_itimer = 0;
 883                         ddq->d_rtbtimer = 0;
 884                         ddq->d_bwarns = 0;
 885                         ddq->d_iwarns = 0;
 886                         ddq->d_rtbwarns = 0;
 887                 }
 888
 889                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 890                         xfs_update_cksum((char *)&dqb[j],
 891                                          sizeof(struct xfs_dqblk),
 892                                          XFS_DQUOT_CRC_OFF);
 893                 }
 894         }
 895 }
 896
 897 STATIC int
 898 xfs_qm_reset_dqcounts_all(
 899         struct xfs_mount        *mp,
 900         xfs_dqid_t              firstid,
 901         xfs_fsblock_t           bno,
 902         xfs_filblks_t           blkcnt,
 903         uint                    flags,
 904         struct list_head        *buffer_list)
 905 {
 906         struct xfs_buf          *bp;
 907         int                     error;
 908         int                     type;
 909
 910         ASSERT(blkcnt > 0);
 911         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 912                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 913         error = 0;
 914
 915         /*
 916          * Blkcnt arg can be a very big number, and might even be
 917          * larger than the log itself. So, we have to break it up into
 918          * manageable-sized transactions.
 919          * Note that we don't start a permanent transaction here; we might
 920          * not be able to get a log reservation for the whole thing up front,
 921          * and we don't really care to either, because we just discard
 922          * everything if we were to crash in the middle of this loop.
 923          */
 924         while (blkcnt--) {
 925                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 926                               XFS_FSB_TO_DADDR(mp, bno),
 927                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 928                               &xfs_dquot_buf_ops);
 929
 930                 /*
 931                  * CRC and validation errors will return a EFSCORRUPTED here. If
 932                  * this occurs, re-read without CRC validation so that we can
 933                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 934                  * will leave a trace in the log indicating corruption has
 935                  * been detected.
 936                  */
 937                 if (error == -EFSCORRUPTED) {
 938                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 939                                       XFS_FSB_TO_DADDR(mp, bno),
 940                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 941                                       NULL);
 942                 }
 943
 944                 if (error)
 945                         break;
 946
 947                 /*
 948                  * A corrupt buffer might not have a verifier attached, so
 949                  * make sure we have the correct one attached before writeback
 950                  * occurs.
 951                  */
 952                 bp->b_ops = &xfs_dquot_buf_ops;
 953                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 954                 xfs_buf_delwri_queue(bp, buffer_list);
 955                 xfs_buf_relse(bp);
 956
 957                 /* goto the next block. */
 958                 bno++;
 959                 firstid += mp->m_quotainfo->qi_dqperchunk;
 960         }
 961
 962         return error;
 963 }
 964
 965 /*
 966  * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 967  * counters for every chunk of dquots that we find.
 968  */
 969 STATIC int
 970 xfs_qm_reset_dqcounts_buf(
 971         struct xfs_mount        *mp,
 972         struct xfs_inode        *qip,
 973         uint                    flags,
 974         struct list_head        *buffer_list)
 975 {
 976         struct xfs_bmbt_irec    *map;
 977         int                     i, nmaps;       /* number of map entries */
 978         int                     error;          /* return value */
 979         xfs_fileoff_t           lblkno;
 980         xfs_filblks_t           maxlblkcnt;
 981         xfs_dqid_t              firstid;
 982         xfs_fsblock_t           rablkno;
 983         xfs_filblks_t           rablkcnt;
 984
 985         error = 0;
 986         /*
 987          * This looks racy, but we can't keep an inode lock across a
 988          * trans_reserve. But, this gets called during quotacheck, and that
 989          * happens only at mount time which is single threaded.
 990          */
 991         if (qip->i_d.di_nblocks == 0)
 992                 return 0;
 993
 994         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
 995
 996         lblkno = 0;
 997         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 998         do {
 999                 uint            lock_mode;
1000
1001                 nmaps = XFS_DQITER_MAP_SIZE;
1002                 /*
1003                  * We aren't changing the inode itself. Just changing
1004                  * some of its data. No new blocks are added here, and
1005                  * the inode is never added to the transaction.
1006                  */
1007                 lock_mode = xfs_ilock_data_map_shared(qip);
1008                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1009                                        map, &nmaps, 0);
1010                 xfs_iunlock(qip, lock_mode);
1011                 if (error)
1012                         break;
1013
1014                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1015                 for (i = 0; i < nmaps; i++) {
1016                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1017                         ASSERT(map[i].br_blockcount);
1018
1019
1020                         lblkno += map[i].br_blockcount;
1021
1022                         if (map[i].br_startblock == HOLESTARTBLOCK)
1023                                 continue;
1024
1025                         firstid = (xfs_dqid_t) map[i].br_startoff *
1026                                 mp->m_quotainfo->qi_dqperchunk;
1027                         /*
1028                          * Do a read-ahead on the next extent.
1029                          */
1030                         if ((i+1 < nmaps) &&
1031                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1032                                 rablkcnt =  map[i+1].br_blockcount;
1033                                 rablkno = map[i+1].br_startblock;
1034                                 while (rablkcnt--) {
1035                                         xfs_buf_readahead(mp->m_ddev_targp,
1036                                                XFS_FSB_TO_DADDR(mp, rablkno),
1037                                                mp->m_quotainfo->qi_dqchunklen,
1038                                                &xfs_dquot_buf_ops);
1039                                         rablkno++;
1040                                 }
1041                         }
1042                         /*
1043                          * Iterate thru all the blks in the extent and
1044                          * reset the counters of all the dquots inside them.
1045                          */
1046                         error = xfs_qm_reset_dqcounts_all(mp, firstid,
1047                                                    map[i].br_startblock,
1048                                                    map[i].br_blockcount,
1049                                                    flags, buffer_list);
1050                         if (error)
1051                                 goto out;
1052                 }
1053         } while (nmaps > 0);
1054
1055 out:
1056         kmem_free(map);
1057         return error;
1058 }
1059
1060 /*
1061  * Called by dqusage_adjust in doing a quotacheck.
1062  *
1063  * Given the inode, and a dquot id this updates both the incore dqout as well
1064  * as the buffer copy. This is so that once the quotacheck is done, we can
1065  * just log all the buffers, as opposed to logging numerous updates to
1066  * individual dquots.
1067  */
1068 STATIC int
1069 xfs_qm_quotacheck_dqadjust(
1070         struct xfs_inode        *ip,
1071         uint                    type,
1072         xfs_qcnt_t              nblks,
1073         xfs_qcnt_t              rtblks)
1074 {
1075         struct xfs_mount        *mp = ip->i_mount;
1076         struct xfs_dquot        *dqp;
1077         xfs_dqid_t              id;
1078         int                     error;
1079
1080         id = xfs_qm_id_for_quotatype(ip, type);
1081         error = xfs_qm_dqget(mp, id, type, true, &dqp);
1082         if (error) {
1083                 /*
1084                  * Shouldn't be able to turn off quotas here.
1085                  */
1086                 ASSERT(error != -ESRCH);
1087                 ASSERT(error != -ENOENT);
1088                 return error;
1089         }
1090
1091         trace_xfs_dqadjust(dqp);
1092
1093         /*
1094          * Adjust the inode count and the block count to reflect this inode's
1095          * resource usage.
1096          */
1097         be64_add_cpu(&dqp->q_core.d_icount, 1);
1098         dqp->q_res_icount++;
1099         if (nblks) {
1100                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1101                 dqp->q_res_bcount += nblks;
1102         }
1103         if (rtblks) {
1104                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1105                 dqp->q_res_rtbcount += rtblks;
1106         }
1107
1108         /*
1109          * Set default limits, adjust timers (since we changed usages)
1110          *
1111          * There are no timers for the default values set in the root dquot.
1112          */
1113         if (dqp->q_core.d_id) {
1114                 xfs_qm_adjust_dqlimits(mp, dqp);
1115                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1116         }
1117
1118         dqp->dq_flags |= XFS_DQ_DIRTY;
1119         xfs_qm_dqput(dqp);
1120         return 0;
1121 }
1122
1123 /*
1124  * callback routine supplied to bulkstat(). Given an inumber, find its
1125  * dquots and update them to account for resources taken by that inode.
1126  */
1127 /* ARGSUSED */
1128 STATIC int
1129 xfs_qm_dqusage_adjust(
1130         struct xfs_mount        *mp,
1131         struct xfs_trans        *tp,
1132         xfs_ino_t               ino,
1133         void                    *data)
1134 {
1135         struct xfs_inode        *ip;
1136         xfs_qcnt_t              nblks;
1137         xfs_filblks_t           rtblks = 0;     /* total rt blks */
1138         int                     error;
1139
1140         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1141
1142         /*
1143          * rootino must have its resources accounted for, not so with the quota
1144          * inodes.
1145          */
1146         if (xfs_is_quota_inode(&mp->m_sb, ino))
1147                 return 0;
1148
1149         /*
1150          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1151          * at mount time and therefore nobody will be racing chown/chproj.
1152          */
1153         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1154         if (error == -EINVAL || error == -ENOENT)
1155                 return 0;
1156         if (error)
1157                 return error;
1158
1159         ASSERT(ip->i_delayed_blks == 0);
1160
1161         if (XFS_IS_REALTIME_INODE(ip)) {
1162                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1163
1164                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1165                         error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1166                         if (error)
1167                                 goto error0;
1168                 }
1169
1170                 xfs_bmap_count_leaves(ifp, &rtblks);
1171         }
1172
1173         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1174
1175         /*
1176          * Add the (disk blocks and inode) resources occupied by this
1177          * inode to its dquots. We do this adjustment in the incore dquot,
1178          * and also copy the changes to its buffer.
1179          * We don't care about putting these changes in a transaction
1180          * envelope because if we crash in the middle of a 'quotacheck'
1181          * we have to start from the beginning anyway.
1182          * Once we're done, we'll log all the dquot bufs.
1183          *
1184          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1185          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1186          */
1187         if (XFS_IS_UQUOTA_ON(mp)) {
1188                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_USER, nblks,
1189                                 rtblks);
1190                 if (error)
1191                         goto error0;
1192         }
1193
1194         if (XFS_IS_GQUOTA_ON(mp)) {
1195                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_GROUP, nblks,
1196                                 rtblks);
1197                 if (error)
1198                         goto error0;
1199         }
1200
1201         if (XFS_IS_PQUOTA_ON(mp)) {
1202                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_PROJ, nblks,
1203                                 rtblks);
1204                 if (error)
1205                         goto error0;
1206         }
1207
1208 error0:
1209         xfs_irele(ip);
1210         return error;
1211 }
1212
1213 STATIC int
1214 xfs_qm_flush_one(
1215         struct xfs_dquot        *dqp,
1216         void                    *data)
1217 {
1218         struct xfs_mount        *mp = dqp->q_mount;
1219         struct list_head        *buffer_list = data;
1220         struct xfs_buf          *bp = NULL;
1221         int                     error = 0;
1222
1223         xfs_dqlock(dqp);
1224         if (dqp->dq_flags & XFS_DQ_FREEING)
1225                 goto out_unlock;
1226         if (!XFS_DQ_IS_DIRTY(dqp))
1227                 goto out_unlock;
1228
1229         /*
1230          * The only way the dquot is already flush locked by the time quotacheck
1231          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1232          * it for the final time. Quotacheck collects all dquot bufs in the
1233          * local delwri queue before dquots are dirtied, so reclaim can't have
1234          * possibly queued it for I/O. The only way out is to push the buffer to
1235          * cycle the flush lock.
1236          */
1237         if (!xfs_dqflock_nowait(dqp)) {
1238                 /* buf is pinned in-core by delwri list */
1239                 bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1240                                 mp->m_quotainfo->qi_dqchunklen, 0);
1241                 if (!bp) {
1242                         error = -EINVAL;
1243                         goto out_unlock;
1244                 }
1245                 xfs_buf_unlock(bp);
1246
1247                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1248                 xfs_buf_rele(bp);
1249
1250                 error = -EAGAIN;
1251                 goto out_unlock;
1252         }
1253
1254         error = xfs_qm_dqflush(dqp, &bp);
1255         if (error)
1256                 goto out_unlock;
1257
1258         xfs_buf_delwri_queue(bp, buffer_list);
1259         xfs_buf_relse(bp);
1260 out_unlock:
1261         xfs_dqunlock(dqp);
1262         return error;
1263 }
1264
1265 /*
1266  * Walk thru all the filesystem inodes and construct a consistent view
1267  * of the disk quota world. If the quotacheck fails, disable quotas.
1268  */
1269 STATIC int
1270 xfs_qm_quotacheck(
1271         xfs_mount_t     *mp)
1272 {
1273         int                     error, error2;
1274         uint                    flags;
1275         LIST_HEAD               (buffer_list);
1276         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1277         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1278         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1279
1280         flags = 0;
1281
1282         ASSERT(uip || gip || pip);
1283         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1284
1285         xfs_notice(mp, "Quotacheck needed: Please wait.");
1286
1287         /*
1288          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1289          * their counters to zero. We need a clean slate.
1290          * We don't log our changes till later.
1291          */
1292         if (uip) {
1293                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_QMOPT_UQUOTA,
1294                                          &buffer_list);
1295                 if (error)
1296                         goto error_return;
1297                 flags |= XFS_UQUOTA_CHKD;
1298         }
1299
1300         if (gip) {
1301                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_QMOPT_GQUOTA,
1302                                          &buffer_list);
1303                 if (error)
1304                         goto error_return;
1305                 flags |= XFS_GQUOTA_CHKD;
1306         }
1307
1308         if (pip) {
1309                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_QMOPT_PQUOTA,
1310                                          &buffer_list);
1311                 if (error)
1312                         goto error_return;
1313                 flags |= XFS_PQUOTA_CHKD;
1314         }
1315
1316         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1317                         NULL);
1318         if (error)
1319                 goto error_return;
1320
1321         /*
1322          * We've made all the changes that we need to make incore.  Flush them
1323          * down to disk buffers if everything was updated successfully.
1324          */
1325         if (XFS_IS_UQUOTA_ON(mp)) {
1326                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1327                                           &buffer_list);
1328         }
1329         if (XFS_IS_GQUOTA_ON(mp)) {
1330                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1331                                            &buffer_list);
1332                 if (!error)
1333                         error = error2;
1334         }
1335         if (XFS_IS_PQUOTA_ON(mp)) {
1336                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1337                                            &buffer_list);
1338                 if (!error)
1339                         error = error2;
1340         }
1341
1342         error2 = xfs_buf_delwri_submit(&buffer_list);
1343         if (!error)
1344                 error = error2;
1345
1346         /*
1347          * We can get this error if we couldn't do a dquot allocation inside
1348          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1349          * dirty dquots that might be cached, we just want to get rid of them
1350          * and turn quotaoff. The dquots won't be attached to any of the inodes
1351          * at this point (because we intentionally didn't in dqget_noattach).
1352          */
1353         if (error) {
1354                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1355                 goto error_return;
1356         }
1357
1358         /*
1359          * If one type of quotas is off, then it will lose its
1360          * quotachecked status, since we won't be doing accounting for
1361          * that type anymore.
1362          */
1363         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1364         mp->m_qflags |= flags;
1365
1366  error_return:
1367         xfs_buf_delwri_cancel(&buffer_list);
1368
1369         if (error) {
1370                 xfs_warn(mp,
1371         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1372                         error);
1373                 /*
1374                  * We must turn off quotas.
1375                  */
1376                 ASSERT(mp->m_quotainfo != NULL);
1377                 xfs_qm_destroy_quotainfo(mp);
1378                 if (xfs_mount_reset_sbqflags(mp)) {
1379                         xfs_warn(mp,
1380                                 "Quotacheck: Failed to reset quota flags.");
1381                 }
1382         } else
1383                 xfs_notice(mp, "Quotacheck: Done.");
1384         return error;
1385 }
1386
1387 /*
1388  * This is called from xfs_mountfs to start quotas and initialize all
1389  * necessary data structures like quotainfo.  This is also responsible for
1390  * running a quotacheck as necessary.  We are guaranteed that the superblock
1391  * is consistently read in at this point.
1392  *
1393  * If we fail here, the mount will continue with quota turned off. We don't
1394  * need to inidicate success or failure at all.
1395  */
1396 void
1397 xfs_qm_mount_quotas(
1398         struct xfs_mount        *mp)
1399 {
1400         int                     error = 0;
1401         uint                    sbf;
1402
1403         /*
1404          * If quotas on realtime volumes is not supported, we disable
1405          * quotas immediately.
1406          */
1407         if (mp->m_sb.sb_rextents) {
1408                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1409                 mp->m_qflags = 0;
1410                 goto write_changes;
1411         }
1412
1413         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1414
1415         /*
1416          * Allocate the quotainfo structure inside the mount struct, and
1417          * create quotainode(s), and change/rev superblock if necessary.
1418          */
1419         error = xfs_qm_init_quotainfo(mp);
1420         if (error) {
1421                 /*
1422                  * We must turn off quotas.
1423                  */
1424                 ASSERT(mp->m_quotainfo == NULL);
1425                 mp->m_qflags = 0;
1426                 goto write_changes;
1427         }
1428         /*
1429          * If any of the quotas are not consistent, do a quotacheck.
1430          */
1431         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1432                 error = xfs_qm_quotacheck(mp);
1433                 if (error) {
1434                         /* Quotacheck failed and disabled quotas. */
1435                         return;
1436                 }
1437         }
1438         /*
1439          * If one type of quotas is off, then it will lose its
1440          * quotachecked status, since we won't be doing accounting for
1441          * that type anymore.
1442          */
1443         if (!XFS_IS_UQUOTA_ON(mp))
1444                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1445         if (!XFS_IS_GQUOTA_ON(mp))
1446                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1447         if (!XFS_IS_PQUOTA_ON(mp))
1448                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1449
1450  write_changes:
1451         /*
1452          * We actually don't have to acquire the m_sb_lock at all.
1453          * This can only be called from mount, and that's single threaded. XXX
1454          */
1455         spin_lock(&mp->m_sb_lock);
1456         sbf = mp->m_sb.sb_qflags;
1457         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1458         spin_unlock(&mp->m_sb_lock);
1459
1460         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1461                 if (xfs_sync_sb(mp, false)) {
1462                         /*
1463                          * We could only have been turning quotas off.
1464                          * We aren't in very good shape actually because
1465                          * the incore structures are convinced that quotas are
1466                          * off, but the on disk superblock doesn't know that !
1467                          */
1468                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1469                         xfs_alert(mp, "%s: Superblock update failed!",
1470                                 __func__);
1471                 }
1472         }
1473
1474         if (error) {
1475                 xfs_warn(mp, "Failed to initialize disk quotas.");
1476                 return;
1477         }
1478 }
1479
1480 /*
1481  * This is called after the superblock has been read in and we're ready to
1482  * iget the quota inodes.
1483  */
1484 STATIC int
1485 xfs_qm_init_quotainos(
1486         xfs_mount_t     *mp)
1487 {
1488         struct xfs_inode        *uip = NULL;
1489         struct xfs_inode        *gip = NULL;
1490         struct xfs_inode        *pip = NULL;
1491         int                     error;
1492         uint                    flags = 0;
1493
1494         ASSERT(mp->m_quotainfo);
1495
1496         /*
1497          * Get the uquota and gquota inodes
1498          */
1499         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1500                 if (XFS_IS_UQUOTA_ON(mp) &&
1501                     mp->m_sb.sb_uquotino != NULLFSINO) {
1502                         ASSERT(mp->m_sb.sb_uquotino > 0);
1503                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1504                                              0, 0, &uip);
1505                         if (error)
1506                                 return error;
1507                 }
1508                 if (XFS_IS_GQUOTA_ON(mp) &&
1509                     mp->m_sb.sb_gquotino != NULLFSINO) {
1510                         ASSERT(mp->m_sb.sb_gquotino > 0);
1511                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1512                                              0, 0, &gip);
1513                         if (error)
1514                                 goto error_rele;
1515                 }
1516                 if (XFS_IS_PQUOTA_ON(mp) &&
1517                     mp->m_sb.sb_pquotino != NULLFSINO) {
1518                         ASSERT(mp->m_sb.sb_pquotino > 0);
1519                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1520                                              0, 0, &pip);
1521                         if (error)
1522                                 goto error_rele;
1523                 }
1524         } else {
1525                 flags |= XFS_QMOPT_SBVERSION;
1526         }
1527
1528         /*
1529          * Create the three inodes, if they don't exist already. The changes
1530          * made above will get added to a transaction and logged in one of
1531          * the qino_alloc calls below.  If the device is readonly,
1532          * temporarily switch to read-write to do this.
1533          */
1534         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1535                 error = xfs_qm_qino_alloc(mp, &uip,
1536                                               flags | XFS_QMOPT_UQUOTA);
1537                 if (error)
1538                         goto error_rele;
1539
1540                 flags &= ~XFS_QMOPT_SBVERSION;
1541         }
1542         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1543                 error = xfs_qm_qino_alloc(mp, &gip,
1544                                           flags | XFS_QMOPT_GQUOTA);
1545                 if (error)
1546                         goto error_rele;
1547
1548                 flags &= ~XFS_QMOPT_SBVERSION;
1549         }
1550         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1551                 error = xfs_qm_qino_alloc(mp, &pip,
1552                                           flags | XFS_QMOPT_PQUOTA);
1553                 if (error)
1554                         goto error_rele;
1555         }
1556
1557         mp->m_quotainfo->qi_uquotaip = uip;
1558         mp->m_quotainfo->qi_gquotaip = gip;
1559         mp->m_quotainfo->qi_pquotaip = pip;
1560
1561         return 0;
1562
1563 error_rele:
1564         if (uip)
1565                 xfs_irele(uip);
1566         if (gip)
1567                 xfs_irele(gip);
1568         if (pip)
1569                 xfs_irele(pip);
1570         return error;
1571 }
1572
1573 STATIC void
1574 xfs_qm_destroy_quotainos(
1575         struct xfs_quotainfo    *qi)
1576 {
1577         if (qi->qi_uquotaip) {
1578                 xfs_irele(qi->qi_uquotaip);
1579                 qi->qi_uquotaip = NULL; /* paranoia */
1580         }
1581         if (qi->qi_gquotaip) {
1582                 xfs_irele(qi->qi_gquotaip);
1583                 qi->qi_gquotaip = NULL;
1584         }
1585         if (qi->qi_pquotaip) {
1586                 xfs_irele(qi->qi_pquotaip);
1587                 qi->qi_pquotaip = NULL;
1588         }
1589 }
1590
1591 STATIC void
1592 xfs_qm_dqfree_one(
1593         struct xfs_dquot        *dqp)
1594 {
1595         struct xfs_mount        *mp = dqp->q_mount;
1596         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1597
1598         mutex_lock(&qi->qi_tree_lock);
1599         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1600                           be32_to_cpu(dqp->q_core.d_id));
1601
1602         qi->qi_dquots--;
1603         mutex_unlock(&qi->qi_tree_lock);
1604
1605         xfs_qm_dqdestroy(dqp);
1606 }
1607
1608 /* --------------- utility functions for vnodeops ---------------- */
1609
1610
1611 /*
1612  * Given an inode, a uid, gid and prid make sure that we have
1613  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1614  * quotas by creating this file.
1615  * This also attaches dquot(s) to the given inode after locking it,
1616  * and returns the dquots corresponding to the uid and/or gid.
1617  *
1618  * in   : inode (unlocked)
1619  * out  : udquot, gdquot with references taken and unlocked
1620  */
1621 int
1622 xfs_qm_vop_dqalloc(
1623         struct xfs_inode        *ip,
1624         kuid_t                  uid,
1625         kgid_t                  gid,
1626         prid_t                  prid,
1627         uint                    flags,
1628         struct xfs_dquot        **O_udqpp,
1629         struct xfs_dquot        **O_gdqpp,
1630         struct xfs_dquot        **O_pdqpp)
1631 {
1632         struct xfs_mount        *mp = ip->i_mount;
1633         struct inode            *inode = VFS_I(ip);
1634         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1635         struct xfs_dquot        *uq = NULL;
1636         struct xfs_dquot        *gq = NULL;
1637         struct xfs_dquot        *pq = NULL;
1638         int                     error;
1639         uint                    lockflags;
1640
1641         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1642                 return 0;
1643
1644         lockflags = XFS_ILOCK_EXCL;
1645         xfs_ilock(ip, lockflags);
1646
1647         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1648                 gid = inode->i_gid;
1649
1650         /*
1651          * Attach the dquot(s) to this inode, doing a dquot allocation
1652          * if necessary. The dquot(s) will not be locked.
1653          */
1654         if (XFS_NOT_DQATTACHED(mp, ip)) {
1655                 error = xfs_qm_dqattach_locked(ip, true);
1656                 if (error) {
1657                         xfs_iunlock(ip, lockflags);
1658                         return error;
1659                 }
1660         }
1661
1662         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1663                 if (!uid_eq(inode->i_uid, uid)) {
1664                         /*
1665                          * What we need is the dquot that has this uid, and
1666                          * if we send the inode to dqget, the uid of the inode
1667                          * takes priority over what's sent in the uid argument.
1668                          * We must unlock inode here before calling dqget if
1669                          * we're not sending the inode, because otherwise
1670                          * we'll deadlock by doing trans_reserve while
1671                          * holding ilock.
1672                          */
1673                         xfs_iunlock(ip, lockflags);
1674                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1675                                         XFS_DQ_USER, true, &uq);
1676                         if (error) {
1677                                 ASSERT(error != -ENOENT);
1678                                 return error;
1679                         }
1680                         /*
1681                          * Get the ilock in the right order.
1682                          */
1683                         xfs_dqunlock(uq);
1684                         lockflags = XFS_ILOCK_SHARED;
1685                         xfs_ilock(ip, lockflags);
1686                 } else {
1687                         /*
1688                          * Take an extra reference, because we'll return
1689                          * this to caller
1690                          */
1691                         ASSERT(ip->i_udquot);
1692                         uq = xfs_qm_dqhold(ip->i_udquot);
1693                 }
1694         }
1695         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1696                 if (!gid_eq(inode->i_gid, gid)) {
1697                         xfs_iunlock(ip, lockflags);
1698                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1699                                         XFS_DQ_GROUP, true, &gq);
1700                         if (error) {
1701                                 ASSERT(error != -ENOENT);
1702                                 goto error_rele;
1703                         }
1704                         xfs_dqunlock(gq);
1705                         lockflags = XFS_ILOCK_SHARED;
1706                         xfs_ilock(ip, lockflags);
1707                 } else {
1708                         ASSERT(ip->i_gdquot);
1709                         gq = xfs_qm_dqhold(ip->i_gdquot);
1710                 }
1711         }
1712         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1713                 if (ip->i_d.di_projid != prid) {
1714                         xfs_iunlock(ip, lockflags);
1715                         error = xfs_qm_dqget(mp, (xfs_dqid_t)prid, XFS_DQ_PROJ,
1716                                         true, &pq);
1717                         if (error) {
1718                                 ASSERT(error != -ENOENT);
1719                                 goto error_rele;
1720                         }
1721                         xfs_dqunlock(pq);
1722                         lockflags = XFS_ILOCK_SHARED;
1723                         xfs_ilock(ip, lockflags);
1724                 } else {
1725                         ASSERT(ip->i_pdquot);
1726                         pq = xfs_qm_dqhold(ip->i_pdquot);
1727                 }
1728         }
1729         if (uq)
1730                 trace_xfs_dquot_dqalloc(ip);
1731
1732         xfs_iunlock(ip, lockflags);
1733         if (O_udqpp)
1734                 *O_udqpp = uq;
1735         else
1736                 xfs_qm_dqrele(uq);
1737         if (O_gdqpp)
1738                 *O_gdqpp = gq;
1739         else
1740                 xfs_qm_dqrele(gq);
1741         if (O_pdqpp)
1742                 *O_pdqpp = pq;
1743         else
1744                 xfs_qm_dqrele(pq);
1745         return 0;
1746
1747 error_rele:
1748         xfs_qm_dqrele(gq);
1749         xfs_qm_dqrele(uq);
1750         return error;
1751 }
1752
1753 /*
1754  * Actually transfer ownership, and do dquot modifications.
1755  * These were already reserved.
1756  */
1757 struct xfs_dquot *
1758 xfs_qm_vop_chown(
1759         struct xfs_trans        *tp,
1760         struct xfs_inode        *ip,
1761         struct xfs_dquot        **IO_olddq,
1762         struct xfs_dquot        *newdq)
1763 {
1764         struct xfs_dquot        *prevdq;
1765         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1766                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1767
1768
1769         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1770         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1771
1772         /* old dquot */
1773         prevdq = *IO_olddq;
1774         ASSERT(prevdq);
1775         ASSERT(prevdq != newdq);
1776
1777         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1778         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1779
1780         /* the sparkling new dquot */
1781         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1782         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1783
1784         /*
1785          * Take an extra reference, because the inode is going to keep
1786          * this dquot pointer even after the trans_commit.
1787          */
1788         *IO_olddq = xfs_qm_dqhold(newdq);
1789
1790         return prevdq;
1791 }
1792
1793 /*
1794  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1795  */
1796 int
1797 xfs_qm_vop_chown_reserve(
1798         struct xfs_trans        *tp,
1799         struct xfs_inode        *ip,
1800         struct xfs_dquot        *udqp,
1801         struct xfs_dquot        *gdqp,
1802         struct xfs_dquot        *pdqp,
1803         uint                    flags)
1804 {
1805         struct xfs_mount        *mp = ip->i_mount;
1806         uint64_t                delblks;
1807         unsigned int            blkflags, prjflags = 0;
1808         struct xfs_dquot        *udq_unres = NULL;
1809         struct xfs_dquot        *gdq_unres = NULL;
1810         struct xfs_dquot        *pdq_unres = NULL;
1811         struct xfs_dquot        *udq_delblks = NULL;
1812         struct xfs_dquot        *gdq_delblks = NULL;
1813         struct xfs_dquot        *pdq_delblks = NULL;
1814         int                     error;
1815
1816
1817         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1818         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1819
1820         delblks = ip->i_delayed_blks;
1821         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1822                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1823
1824         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1825             i_uid_read(VFS_I(ip)) != be32_to_cpu(udqp->q_core.d_id)) {
1826                 udq_delblks = udqp;
1827                 /*
1828                  * If there are delayed allocation blocks, then we have to
1829                  * unreserve those from the old dquot, and add them to the
1830                  * new dquot.
1831                  */
1832                 if (delblks) {
1833                         ASSERT(ip->i_udquot);
1834                         udq_unres = ip->i_udquot;
1835                 }
1836         }
1837         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1838             i_gid_read(VFS_I(ip)) != be32_to_cpu(gdqp->q_core.d_id)) {
1839                 gdq_delblks = gdqp;
1840                 if (delblks) {
1841                         ASSERT(ip->i_gdquot);
1842                         gdq_unres = ip->i_gdquot;
1843                 }
1844         }
1845
1846         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1847             ip->i_d.di_projid != be32_to_cpu(pdqp->q_core.d_id)) {
1848                 prjflags = XFS_QMOPT_ENOSPC;
1849                 pdq_delblks = pdqp;
1850                 if (delblks) {
1851                         ASSERT(ip->i_pdquot);
1852                         pdq_unres = ip->i_pdquot;
1853                 }
1854         }
1855
1856         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1857                                 udq_delblks, gdq_delblks, pdq_delblks,
1858                                 ip->i_d.di_nblocks, 1,
1859                                 flags | blkflags | prjflags);
1860         if (error)
1861                 return error;
1862
1863         /*
1864          * Do the delayed blks reservations/unreservations now. Since, these
1865          * are done without the help of a transaction, if a reservation fails
1866          * its previous reservations won't be automatically undone by trans
1867          * code. So, we have to do it manually here.
1868          */
1869         if (delblks) {
1870                 /*
1871                  * Do the reservations first. Unreservation can't fail.
1872                  */
1873                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1874                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1875                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1876                             udq_delblks, gdq_delblks, pdq_delblks,
1877                             (xfs_qcnt_t)delblks, 0,
1878                             flags | blkflags | prjflags);
1879                 if (error)
1880                         return error;
1881                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1882                                 udq_unres, gdq_unres, pdq_unres,
1883                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1884         }
1885
1886         return 0;
1887 }
1888
1889 int
1890 xfs_qm_vop_rename_dqattach(
1891         struct xfs_inode        **i_tab)
1892 {
1893         struct xfs_mount        *mp = i_tab[0]->i_mount;
1894         int                     i;
1895
1896         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1897                 return 0;
1898
1899         for (i = 0; (i < 4 && i_tab[i]); i++) {
1900                 struct xfs_inode        *ip = i_tab[i];
1901                 int                     error;
1902
1903                 /*
1904                  * Watch out for duplicate entries in the table.
1905                  */
1906                 if (i == 0 || ip != i_tab[i-1]) {
1907                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1908                                 error = xfs_qm_dqattach(ip);
1909                                 if (error)
1910                                         return error;
1911                         }
1912                 }
1913         }
1914         return 0;
1915 }
1916
1917 void
1918 xfs_qm_vop_create_dqattach(
1919         struct xfs_trans        *tp,
1920         struct xfs_inode        *ip,
1921         struct xfs_dquot        *udqp,
1922         struct xfs_dquot        *gdqp,
1923         struct xfs_dquot        *pdqp)
1924 {
1925         struct xfs_mount        *mp = tp->t_mountp;
1926
1927         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1928                 return;
1929
1930         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1931         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1932
1933         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1934                 ASSERT(ip->i_udquot == NULL);
1935                 ASSERT(i_uid_read(VFS_I(ip)) == be32_to_cpu(udqp->q_core.d_id));
1936
1937                 ip->i_udquot = xfs_qm_dqhold(udqp);
1938                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1939         }
1940         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1941                 ASSERT(ip->i_gdquot == NULL);
1942                 ASSERT(i_gid_read(VFS_I(ip)) == be32_to_cpu(gdqp->q_core.d_id));
1943
1944                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1945                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1946         }
1947         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1948                 ASSERT(ip->i_pdquot == NULL);
1949                 ASSERT(ip->i_d.di_projid == be32_to_cpu(pdqp->q_core.d_id));
1950
1951                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1952                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1953         }
1954 }
1955