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         xfs_dqtype_t            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 = dqp->q_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->q_flags & XFS_DQFLAG_FREEING) || dqp->q_nrefs != 0)
 128                 goto out_unlock;
 129
 130         dqp->q_flags |= XFS_DQFLAG_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->q_flags &= ~XFS_DQFLAG_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, xfs_dquot_type(dqp)), dqp->q_id);
 165         qi->qi_dquots--;
 166
 167         /*
 168          * We move dquots to the freelist as soon as their reference count
 169          * hits zero, so it really should be on the freelist here.
 170          */
 171         ASSERT(!list_empty(&dqp->q_lru));
 172         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 173         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 174
 175         xfs_qm_dqdestroy(dqp);
 176         return 0;
 177
 178 out_unlock:
 179         xfs_dqunlock(dqp);
 180         return error;
 181 }
 182
 183 /*
 184  * Purge the dquot cache.
 185  */
 186 void
 187 xfs_qm_dqpurge_all(
 188         struct xfs_mount        *mp,
 189         uint                    flags)
 190 {
 191         if (flags & XFS_QMOPT_UQUOTA)
 192                 xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_dqpurge, NULL);
 193         if (flags & XFS_QMOPT_GQUOTA)
 194                 xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_dqpurge, NULL);
 195         if (flags & XFS_QMOPT_PQUOTA)
 196                 xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_dqpurge, NULL);
 197 }
 198
 199 /*
 200  * Just destroy the quotainfo structure.
 201  */
 202 void
 203 xfs_qm_unmount(
 204         struct xfs_mount        *mp)
 205 {
 206         if (mp->m_quotainfo) {
 207                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 208                 xfs_qm_destroy_quotainfo(mp);
 209         }
 210 }
 211
 212 /*
 213  * Called from the vfsops layer.
 214  */
 215 void
 216 xfs_qm_unmount_quotas(
 217         xfs_mount_t     *mp)
 218 {
 219         /*
 220          * Release the dquots that root inode, et al might be holding,
 221          * before we flush quotas and blow away the quotainfo structure.
 222          */
 223         ASSERT(mp->m_rootip);
 224         xfs_qm_dqdetach(mp->m_rootip);
 225         if (mp->m_rbmip)
 226                 xfs_qm_dqdetach(mp->m_rbmip);
 227         if (mp->m_rsumip)
 228                 xfs_qm_dqdetach(mp->m_rsumip);
 229
 230         /*
 231          * Release the quota inodes.
 232          */
 233         if (mp->m_quotainfo) {
 234                 if (mp->m_quotainfo->qi_uquotaip) {
 235                         xfs_irele(mp->m_quotainfo->qi_uquotaip);
 236                         mp->m_quotainfo->qi_uquotaip = NULL;
 237                 }
 238                 if (mp->m_quotainfo->qi_gquotaip) {
 239                         xfs_irele(mp->m_quotainfo->qi_gquotaip);
 240                         mp->m_quotainfo->qi_gquotaip = NULL;
 241                 }
 242                 if (mp->m_quotainfo->qi_pquotaip) {
 243                         xfs_irele(mp->m_quotainfo->qi_pquotaip);
 244                         mp->m_quotainfo->qi_pquotaip = NULL;
 245                 }
 246         }
 247 }
 248
 249 STATIC int
 250 xfs_qm_dqattach_one(
 251         struct xfs_inode        *ip,
 252         xfs_dqid_t              id,
 253         xfs_dqtype_t            type,
 254         bool                    doalloc,
 255         struct xfs_dquot        **IO_idqpp)
 256 {
 257         struct xfs_dquot        *dqp;
 258         int                     error;
 259
 260         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 261         error = 0;
 262
 263         /*
 264          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 265          * or &i_gdquot. This made the code look weird, but made the logic a lot
 266          * simpler.
 267          */
 268         dqp = *IO_idqpp;
 269         if (dqp) {
 270                 trace_xfs_dqattach_found(dqp);
 271                 return 0;
 272         }
 273
 274         /*
 275          * Find the dquot from somewhere. This bumps the reference count of
 276          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 277          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 278          * turned off suddenly.
 279          */
 280         error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
 281         if (error)
 282                 return error;
 283
 284         trace_xfs_dqattach_get(dqp);
 285
 286         /*
 287          * dqget may have dropped and re-acquired the ilock, but it guarantees
 288          * that the dquot returned is the one that should go in the inode.
 289          */
 290         *IO_idqpp = dqp;
 291         xfs_dqunlock(dqp);
 292         return 0;
 293 }
 294
 295 static bool
 296 xfs_qm_need_dqattach(
 297         struct xfs_inode        *ip)
 298 {
 299         struct xfs_mount        *mp = ip->i_mount;
 300
 301         if (!XFS_IS_QUOTA_RUNNING(mp))
 302                 return false;
 303         if (!XFS_IS_QUOTA_ON(mp))
 304                 return false;
 305         if (!XFS_NOT_DQATTACHED(mp, ip))
 306                 return false;
 307         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 308                 return false;
 309         return true;
 310 }
 311
 312 /*
 313  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 314  * into account.
 315  * If @doalloc is true, the dquot(s) will be allocated if needed.
 316  * Inode may get unlocked and relocked in here, and the caller must deal with
 317  * the consequences.
 318  */
 319 int
 320 xfs_qm_dqattach_locked(
 321         xfs_inode_t     *ip,
 322         bool            doalloc)
 323 {
 324         xfs_mount_t     *mp = ip->i_mount;
 325         int             error = 0;
 326
 327         if (!xfs_qm_need_dqattach(ip))
 328                 return 0;
 329
 330         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 331
 332         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 333                 error = xfs_qm_dqattach_one(ip, i_uid_read(VFS_I(ip)),
 334                                 XFS_DQTYPE_USER, doalloc, &ip->i_udquot);
 335                 if (error)
 336                         goto done;
 337                 ASSERT(ip->i_udquot);
 338         }
 339
 340         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 341                 error = xfs_qm_dqattach_one(ip, i_gid_read(VFS_I(ip)),
 342                                 XFS_DQTYPE_GROUP, doalloc, &ip->i_gdquot);
 343                 if (error)
 344                         goto done;
 345                 ASSERT(ip->i_gdquot);
 346         }
 347
 348         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 349                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQTYPE_PROJ,
 350                                 doalloc, &ip->i_pdquot);
 351                 if (error)
 352                         goto done;
 353                 ASSERT(ip->i_pdquot);
 354         }
 355
 356 done:
 357         /*
 358          * Don't worry about the dquots that we may have attached before any
 359          * error - they'll get detached later if it has not already been done.
 360          */
 361         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 362         return error;
 363 }
 364
 365 int
 366 xfs_qm_dqattach(
 367         struct xfs_inode        *ip)
 368 {
 369         int                     error;
 370
 371         if (!xfs_qm_need_dqattach(ip))
 372                 return 0;
 373
 374         xfs_ilock(ip, XFS_ILOCK_EXCL);
 375         error = xfs_qm_dqattach_locked(ip, false);
 376         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 377
 378         return error;
 379 }
 380
 381 /*
 382  * Release dquots (and their references) if any.
 383  * The inode should be locked EXCL except when this's called by
 384  * xfs_ireclaim.
 385  */
 386 void
 387 xfs_qm_dqdetach(
 388         xfs_inode_t     *ip)
 389 {
 390         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 391                 return;
 392
 393         trace_xfs_dquot_dqdetach(ip);
 394
 395         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 396         if (ip->i_udquot) {
 397                 xfs_qm_dqrele(ip->i_udquot);
 398                 ip->i_udquot = NULL;
 399         }
 400         if (ip->i_gdquot) {
 401                 xfs_qm_dqrele(ip->i_gdquot);
 402                 ip->i_gdquot = NULL;
 403         }
 404         if (ip->i_pdquot) {
 405                 xfs_qm_dqrele(ip->i_pdquot);
 406                 ip->i_pdquot = NULL;
 407         }
 408 }
 409
 410 struct xfs_qm_isolate {
 411         struct list_head        buffers;
 412         struct list_head        dispose;
 413 };
 414
 415 static enum lru_status
 416 xfs_qm_dquot_isolate(
 417         struct list_head        *item,
 418         struct list_lru_one     *lru,
 419         spinlock_t              *lru_lock,
 420         void                    *arg)
 421                 __releases(lru_lock) __acquires(lru_lock)
 422 {
 423         struct xfs_dquot        *dqp = container_of(item,
 424                                                 struct xfs_dquot, q_lru);
 425         struct xfs_qm_isolate   *isol = arg;
 426
 427         if (!xfs_dqlock_nowait(dqp))
 428                 goto out_miss_busy;
 429
 430         /*
 431          * This dquot has acquired a reference in the meantime remove it from
 432          * the freelist and try again.
 433          */
 434         if (dqp->q_nrefs) {
 435                 xfs_dqunlock(dqp);
 436                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 437
 438                 trace_xfs_dqreclaim_want(dqp);
 439                 list_lru_isolate(lru, &dqp->q_lru);
 440                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 441                 return LRU_REMOVED;
 442         }
 443
 444         /*
 445          * If the dquot is dirty, flush it. If it's already being flushed, just
 446          * skip it so there is time for the IO to complete before we try to
 447          * reclaim it again on the next LRU pass.
 448          */
 449         if (!xfs_dqflock_nowait(dqp)) {
 450                 xfs_dqunlock(dqp);
 451                 goto out_miss_busy;
 452         }
 453
 454         if (XFS_DQ_IS_DIRTY(dqp)) {
 455                 struct xfs_buf  *bp = NULL;
 456                 int             error;
 457
 458                 trace_xfs_dqreclaim_dirty(dqp);
 459
 460                 /* we have to drop the LRU lock to flush the dquot */
 461                 spin_unlock(lru_lock);
 462
 463                 error = xfs_qm_dqflush(dqp, &bp);
 464                 if (error)
 465                         goto out_unlock_dirty;
 466
 467                 xfs_buf_delwri_queue(bp, &isol->buffers);
 468                 xfs_buf_relse(bp);
 469                 goto out_unlock_dirty;
 470         }
 471         xfs_dqfunlock(dqp);
 472
 473         /*
 474          * Prevent lookups now that we are past the point of no return.
 475          */
 476         dqp->q_flags |= XFS_DQFLAG_FREEING;
 477         xfs_dqunlock(dqp);
 478
 479         ASSERT(dqp->q_nrefs == 0);
 480         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 481         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 482         trace_xfs_dqreclaim_done(dqp);
 483         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 484         return LRU_REMOVED;
 485
 486 out_miss_busy:
 487         trace_xfs_dqreclaim_busy(dqp);
 488         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 489         return LRU_SKIP;
 490
 491 out_unlock_dirty:
 492         trace_xfs_dqreclaim_busy(dqp);
 493         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 494         xfs_dqunlock(dqp);
 495         spin_lock(lru_lock);
 496         return LRU_RETRY;
 497 }
 498
 499 static unsigned long
 500 xfs_qm_shrink_scan(
 501         struct shrinker         *shrink,
 502         struct shrink_control   *sc)
 503 {
 504         struct xfs_quotainfo    *qi = container_of(shrink,
 505                                         struct xfs_quotainfo, qi_shrinker);
 506         struct xfs_qm_isolate   isol;
 507         unsigned long           freed;
 508         int                     error;
 509
 510         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 511                 return 0;
 512
 513         INIT_LIST_HEAD(&isol.buffers);
 514         INIT_LIST_HEAD(&isol.dispose);
 515
 516         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 517                                      xfs_qm_dquot_isolate, &isol);
 518
 519         error = xfs_buf_delwri_submit(&isol.buffers);
 520         if (error)
 521                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 522
 523         while (!list_empty(&isol.dispose)) {
 524                 struct xfs_dquot        *dqp;
 525
 526                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 527                 list_del_init(&dqp->q_lru);
 528                 xfs_qm_dqfree_one(dqp);
 529         }
 530
 531         return freed;
 532 }
 533
 534 static unsigned long
 535 xfs_qm_shrink_count(
 536         struct shrinker         *shrink,
 537         struct shrink_control   *sc)
 538 {
 539         struct xfs_quotainfo    *qi = container_of(shrink,
 540                                         struct xfs_quotainfo, qi_shrinker);
 541
 542         return list_lru_shrink_count(&qi->qi_lru, sc);
 543 }
 544
 545 STATIC void
 546 xfs_qm_set_defquota(
 547         struct xfs_mount        *mp,
 548         xfs_dqtype_t            type,
 549         struct xfs_quotainfo    *qinf)
 550 {
 551         struct xfs_dquot        *dqp;
 552         struct xfs_def_quota    *defq;
 553         int                     error;
 554
 555         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 556         if (error)
 557                 return;
 558
 559         defq = xfs_get_defquota(qinf, xfs_dquot_type(dqp));
 560
 561         /*
 562          * Timers and warnings have been already set, let's just set the
 563          * default limits for this quota type
 564          */
 565         defq->blk.hard = dqp->q_blk.hardlimit;
 566         defq->blk.soft = dqp->q_blk.softlimit;
 567         defq->ino.hard = dqp->q_ino.hardlimit;
 568         defq->ino.soft = dqp->q_ino.softlimit;
 569         defq->rtb.hard = dqp->q_rtb.hardlimit;
 570         defq->rtb.soft = dqp->q_rtb.softlimit;
 571         xfs_qm_dqdestroy(dqp);
 572 }
 573
 574 /* Initialize quota time limits from the root dquot. */
 575 static void
 576 xfs_qm_init_timelimits(
 577         struct xfs_mount        *mp,
 578         xfs_dqtype_t            type)
 579 {
 580         struct xfs_quotainfo    *qinf = mp->m_quotainfo;
 581         struct xfs_def_quota    *defq;
 582         struct xfs_dquot        *dqp;
 583         int                     error;
 584
 585         defq = xfs_get_defquota(qinf, type);
 586
 587         defq->blk.time = XFS_QM_BTIMELIMIT;
 588         defq->ino.time = XFS_QM_ITIMELIMIT;
 589         defq->rtb.time = XFS_QM_RTBTIMELIMIT;
 590         defq->blk.warn = XFS_QM_BWARNLIMIT;
 591         defq->ino.warn = XFS_QM_IWARNLIMIT;
 592         defq->rtb.warn = XFS_QM_RTBWARNLIMIT;
 593
 594         /*
 595          * We try to get the limits from the superuser's limits fields.
 596          * This is quite hacky, but it is standard quota practice.
 597          *
 598          * Since we may not have done a quotacheck by this point, just read
 599          * the dquot without attaching it to any hashtables or lists.
 600          */
 601         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 602         if (error)
 603                 return;
 604
 605         /*
 606          * The warnings and timers set the grace period given to
 607          * a user or group before he or she can not perform any
 608          * more writing. If it is zero, a default is used.
 609          */
 610         if (dqp->q_blk.timer)
 611                 defq->blk.time = dqp->q_blk.timer;
 612         if (dqp->q_ino.timer)
 613                 defq->ino.time = dqp->q_ino.timer;
 614         if (dqp->q_rtb.timer)
 615                 defq->rtb.time = dqp->q_rtb.timer;
 616         if (dqp->q_blk.warnings)
 617                 defq->blk.warn = dqp->q_blk.warnings;
 618         if (dqp->q_ino.warnings)
 619                 defq->ino.warn = dqp->q_ino.warnings;
 620         if (dqp->q_rtb.warnings)
 621                 defq->rtb.warn = dqp->q_rtb.warnings;
 622
 623         xfs_qm_dqdestroy(dqp);
 624 }
 625
 626 /*
 627  * This initializes all the quota information that's kept in the
 628  * mount structure
 629  */
 630 STATIC int
 631 xfs_qm_init_quotainfo(
 632         struct xfs_mount        *mp)
 633 {
 634         struct xfs_quotainfo    *qinf;
 635         int                     error;
 636
 637         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 638
 639         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
 640
 641         error = list_lru_init(&qinf->qi_lru);
 642         if (error)
 643                 goto out_free_qinf;
 644
 645         /*
 646          * See if quotainodes are setup, and if not, allocate them,
 647          * and change the superblock accordingly.
 648          */
 649         error = xfs_qm_init_quotainos(mp);
 650         if (error)
 651                 goto out_free_lru;
 652
 653         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 654         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 655         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 656         mutex_init(&qinf->qi_tree_lock);
 657
 658         /* mutex used to serialize quotaoffs */
 659         mutex_init(&qinf->qi_quotaofflock);
 660
 661         /* Precalc some constants */
 662         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 663         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 664
 665         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 666
 667         xfs_qm_init_timelimits(mp, XFS_DQTYPE_USER);
 668         xfs_qm_init_timelimits(mp, XFS_DQTYPE_GROUP);
 669         xfs_qm_init_timelimits(mp, XFS_DQTYPE_PROJ);
 670
 671         if (XFS_IS_UQUOTA_RUNNING(mp))
 672                 xfs_qm_set_defquota(mp, XFS_DQTYPE_USER, qinf);
 673         if (XFS_IS_GQUOTA_RUNNING(mp))
 674                 xfs_qm_set_defquota(mp, XFS_DQTYPE_GROUP, qinf);
 675         if (XFS_IS_PQUOTA_RUNNING(mp))
 676                 xfs_qm_set_defquota(mp, XFS_DQTYPE_PROJ, qinf);
 677
 678         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 679         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 680         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 681         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 682
 683         error = register_shrinker(&qinf->qi_shrinker);
 684         if (error)
 685                 goto out_free_inos;
 686
 687         return 0;
 688
 689 out_free_inos:
 690         mutex_destroy(&qinf->qi_quotaofflock);
 691         mutex_destroy(&qinf->qi_tree_lock);
 692         xfs_qm_destroy_quotainos(qinf);
 693 out_free_lru:
 694         list_lru_destroy(&qinf->qi_lru);
 695 out_free_qinf:
 696         kmem_free(qinf);
 697         mp->m_quotainfo = NULL;
 698         return error;
 699 }
 700
 701 /*
 702  * Gets called when unmounting a filesystem or when all quotas get
 703  * turned off.
 704  * This purges the quota inodes, destroys locks and frees itself.
 705  */
 706 void
 707 xfs_qm_destroy_quotainfo(
 708         struct xfs_mount        *mp)
 709 {
 710         struct xfs_quotainfo    *qi;
 711
 712         qi = mp->m_quotainfo;
 713         ASSERT(qi != NULL);
 714
 715         unregister_shrinker(&qi->qi_shrinker);
 716         list_lru_destroy(&qi->qi_lru);
 717         xfs_qm_destroy_quotainos(qi);
 718         mutex_destroy(&qi->qi_tree_lock);
 719         mutex_destroy(&qi->qi_quotaofflock);
 720         kmem_free(qi);
 721         mp->m_quotainfo = NULL;
 722 }
 723
 724 /*
 725  * Create an inode and return with a reference already taken, but unlocked
 726  * This is how we create quota inodes
 727  */
 728 STATIC int
 729 xfs_qm_qino_alloc(
 730         xfs_mount_t     *mp,
 731         xfs_inode_t     **ip,
 732         uint            flags)
 733 {
 734         xfs_trans_t     *tp;
 735         int             error;
 736         bool            need_alloc = true;
 737
 738         *ip = NULL;
 739         /*
 740          * With superblock that doesn't have separate pquotino, we
 741          * share an inode between gquota and pquota. If the on-disk
 742          * superblock has GQUOTA and the filesystem is now mounted
 743          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 744          * vice-versa.
 745          */
 746         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 747                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 748                 xfs_ino_t ino = NULLFSINO;
 749
 750                 if ((flags & XFS_QMOPT_PQUOTA) &&
 751                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 752                         ino = mp->m_sb.sb_gquotino;
 753                         if (XFS_IS_CORRUPT(mp,
 754                                            mp->m_sb.sb_pquotino != NULLFSINO))
 755                                 return -EFSCORRUPTED;
 756                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 757                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 758                         ino = mp->m_sb.sb_pquotino;
 759                         if (XFS_IS_CORRUPT(mp,
 760                                            mp->m_sb.sb_gquotino != NULLFSINO))
 761                                 return -EFSCORRUPTED;
 762                 }
 763                 if (ino != NULLFSINO) {
 764                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 765                         if (error)
 766                                 return error;
 767                         mp->m_sb.sb_gquotino = NULLFSINO;
 768                         mp->m_sb.sb_pquotino = NULLFSINO;
 769                         need_alloc = false;
 770                 }
 771         }
 772
 773         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 774                         need_alloc ? XFS_QM_QINOCREATE_SPACE_RES(mp) : 0,
 775                         0, 0, &tp);
 776         if (error)
 777                 return error;
 778
 779         if (need_alloc) {
 780                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
 781                 if (error) {
 782                         xfs_trans_cancel(tp);
 783                         return error;
 784                 }
 785         }
 786
 787         /*
 788          * Make the changes in the superblock, and log those too.
 789          * sbfields arg may contain fields other than *QUOTINO;
 790          * VERSIONNUM for example.
 791          */
 792         spin_lock(&mp->m_sb_lock);
 793         if (flags & XFS_QMOPT_SBVERSION) {
 794                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 795
 796                 xfs_sb_version_addquota(&mp->m_sb);
 797                 mp->m_sb.sb_uquotino = NULLFSINO;
 798                 mp->m_sb.sb_gquotino = NULLFSINO;
 799                 mp->m_sb.sb_pquotino = NULLFSINO;
 800
 801                 /* qflags will get updated fully _after_ quotacheck */
 802                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 803         }
 804         if (flags & XFS_QMOPT_UQUOTA)
 805                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 806         else if (flags & XFS_QMOPT_GQUOTA)
 807                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 808         else
 809                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 810         spin_unlock(&mp->m_sb_lock);
 811         xfs_log_sb(tp);
 812
 813         error = xfs_trans_commit(tp);
 814         if (error) {
 815                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 816                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 817         }
 818         if (need_alloc)
 819                 xfs_finish_inode_setup(*ip);
 820         return error;
 821 }
 822
 823
 824 STATIC void
 825 xfs_qm_reset_dqcounts(
 826         struct xfs_mount        *mp,
 827         struct xfs_buf          *bp,
 828         xfs_dqid_t              id,
 829         xfs_dqtype_t            type)
 830 {
 831         struct xfs_dqblk        *dqb;
 832         int                     j;
 833
 834         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 835
 836         /*
 837          * Reset all counters and timers. They'll be
 838          * started afresh by xfs_qm_quotacheck.
 839          */
 840 #ifdef DEBUG
 841         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 842                 sizeof(xfs_dqblk_t);
 843         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 844 #endif
 845         dqb = bp->b_addr;
 846         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 847                 struct xfs_disk_dquot   *ddq;
 848
 849                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 850
 851                 /*
 852                  * Do a sanity check, and if needed, repair the dqblk. Don't
 853                  * output any warnings because it's perfectly possible to
 854                  * find uninitialised dquot blks. See comment in
 855                  * xfs_dquot_verify.
 856                  */
 857                 if (xfs_dqblk_verify(mp, &dqb[j], id + j) ||
 858                     (dqb[j].dd_diskdq.d_type & XFS_DQTYPE_REC_MASK) != type)
 859                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 860
 861                 /*
 862                  * Reset type in case we are reusing group quota file for
 863                  * project quotas or vice versa
 864                  */
 865                 ddq->d_type = type;
 866                 ddq->d_bcount = 0;
 867                 ddq->d_icount = 0;
 868                 ddq->d_rtbcount = 0;
 869
 870                 /*
 871                  * dquot id 0 stores the default grace period and the maximum
 872                  * warning limit that were set by the administrator, so we
 873                  * should not reset them.
 874                  */
 875                 if (ddq->d_id != 0) {
 876                         ddq->d_btimer = 0;
 877                         ddq->d_itimer = 0;
 878                         ddq->d_rtbtimer = 0;
 879                         ddq->d_bwarns = 0;
 880                         ddq->d_iwarns = 0;
 881                         ddq->d_rtbwarns = 0;
 882                 }
 883
 884                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 885                         xfs_update_cksum((char *)&dqb[j],
 886                                          sizeof(struct xfs_dqblk),
 887                                          XFS_DQUOT_CRC_OFF);
 888                 }
 889         }
 890 }
 891
 892 STATIC int
 893 xfs_qm_reset_dqcounts_all(
 894         struct xfs_mount        *mp,
 895         xfs_dqid_t              firstid,
 896         xfs_fsblock_t           bno,
 897         xfs_filblks_t           blkcnt,
 898         xfs_dqtype_t            type,
 899         struct list_head        *buffer_list)
 900 {
 901         struct xfs_buf          *bp;
 902         int                     error = 0;
 903
 904         ASSERT(blkcnt > 0);
 905
 906         /*
 907          * Blkcnt arg can be a very big number, and might even be
 908          * larger than the log itself. So, we have to break it up into
 909          * manageable-sized transactions.
 910          * Note that we don't start a permanent transaction here; we might
 911          * not be able to get a log reservation for the whole thing up front,
 912          * and we don't really care to either, because we just discard
 913          * everything if we were to crash in the middle of this loop.
 914          */
 915         while (blkcnt--) {
 916                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 917                               XFS_FSB_TO_DADDR(mp, bno),
 918                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 919                               &xfs_dquot_buf_ops);
 920
 921                 /*
 922                  * CRC and validation errors will return a EFSCORRUPTED here. If
 923                  * this occurs, re-read without CRC validation so that we can
 924                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 925                  * will leave a trace in the log indicating corruption has
 926                  * been detected.
 927                  */
 928                 if (error == -EFSCORRUPTED) {
 929                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 930                                       XFS_FSB_TO_DADDR(mp, bno),
 931                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 932                                       NULL);
 933                 }
 934
 935                 if (error)
 936                         break;
 937
 938                 /*
 939                  * A corrupt buffer might not have a verifier attached, so
 940                  * make sure we have the correct one attached before writeback
 941                  * occurs.
 942                  */
 943                 bp->b_ops = &xfs_dquot_buf_ops;
 944                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 945                 xfs_buf_delwri_queue(bp, buffer_list);
 946                 xfs_buf_relse(bp);
 947
 948                 /* goto the next block. */
 949                 bno++;
 950                 firstid += mp->m_quotainfo->qi_dqperchunk;
 951         }
 952
 953         return error;
 954 }
 955
 956 /*
 957  * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 958  * counters for every chunk of dquots that we find.
 959  */
 960 STATIC int
 961 xfs_qm_reset_dqcounts_buf(
 962         struct xfs_mount        *mp,
 963         struct xfs_inode        *qip,
 964         xfs_dqtype_t            type,
 965         struct list_head        *buffer_list)
 966 {
 967         struct xfs_bmbt_irec    *map;
 968         int                     i, nmaps;       /* number of map entries */
 969         int                     error;          /* return value */
 970         xfs_fileoff_t           lblkno;
 971         xfs_filblks_t           maxlblkcnt;
 972         xfs_dqid_t              firstid;
 973         xfs_fsblock_t           rablkno;
 974         xfs_filblks_t           rablkcnt;
 975
 976         error = 0;
 977         /*
 978          * This looks racy, but we can't keep an inode lock across a
 979          * trans_reserve. But, this gets called during quotacheck, and that
 980          * happens only at mount time which is single threaded.
 981          */
 982         if (qip->i_d.di_nblocks == 0)
 983                 return 0;
 984
 985         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
 986
 987         lblkno = 0;
 988         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 989         do {
 990                 uint            lock_mode;
 991
 992                 nmaps = XFS_DQITER_MAP_SIZE;
 993                 /*
 994                  * We aren't changing the inode itself. Just changing
 995                  * some of its data. No new blocks are added here, and
 996                  * the inode is never added to the transaction.
 997                  */
 998                 lock_mode = xfs_ilock_data_map_shared(qip);
 999                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1000                                        map, &nmaps, 0);
1001                 xfs_iunlock(qip, lock_mode);
1002                 if (error)
1003                         break;
1004
1005                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1006                 for (i = 0; i < nmaps; i++) {
1007                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1008                         ASSERT(map[i].br_blockcount);
1009
1010
1011                         lblkno += map[i].br_blockcount;
1012
1013                         if (map[i].br_startblock == HOLESTARTBLOCK)
1014                                 continue;
1015
1016                         firstid = (xfs_dqid_t) map[i].br_startoff *
1017                                 mp->m_quotainfo->qi_dqperchunk;
1018                         /*
1019                          * Do a read-ahead on the next extent.
1020                          */
1021                         if ((i+1 < nmaps) &&
1022                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1023                                 rablkcnt =  map[i+1].br_blockcount;
1024                                 rablkno = map[i+1].br_startblock;
1025                                 while (rablkcnt--) {
1026                                         xfs_buf_readahead(mp->m_ddev_targp,
1027                                                XFS_FSB_TO_DADDR(mp, rablkno),
1028                                                mp->m_quotainfo->qi_dqchunklen,
1029                                                &xfs_dquot_buf_ops);
1030                                         rablkno++;
1031                                 }
1032                         }
1033                         /*
1034                          * Iterate thru all the blks in the extent and
1035                          * reset the counters of all the dquots inside them.
1036                          */
1037                         error = xfs_qm_reset_dqcounts_all(mp, firstid,
1038                                                    map[i].br_startblock,
1039                                                    map[i].br_blockcount,
1040                                                    type, buffer_list);
1041                         if (error)
1042                                 goto out;
1043                 }
1044         } while (nmaps > 0);
1045
1046 out:
1047         kmem_free(map);
1048         return error;
1049 }
1050
1051 /*
1052  * Called by dqusage_adjust in doing a quotacheck.
1053  *
1054  * Given the inode, and a dquot id this updates both the incore dqout as well
1055  * as the buffer copy. This is so that once the quotacheck is done, we can
1056  * just log all the buffers, as opposed to logging numerous updates to
1057  * individual dquots.
1058  */
1059 STATIC int
1060 xfs_qm_quotacheck_dqadjust(
1061         struct xfs_inode        *ip,
1062         xfs_dqtype_t            type,
1063         xfs_qcnt_t              nblks,
1064         xfs_qcnt_t              rtblks)
1065 {
1066         struct xfs_mount        *mp = ip->i_mount;
1067         struct xfs_dquot        *dqp;
1068         xfs_dqid_t              id;
1069         int                     error;
1070
1071         id = xfs_qm_id_for_quotatype(ip, type);
1072         error = xfs_qm_dqget(mp, id, type, true, &dqp);
1073         if (error) {
1074                 /*
1075                  * Shouldn't be able to turn off quotas here.
1076                  */
1077                 ASSERT(error != -ESRCH);
1078                 ASSERT(error != -ENOENT);
1079                 return error;
1080         }
1081
1082         trace_xfs_dqadjust(dqp);
1083
1084         /*
1085          * Adjust the inode count and the block count to reflect this inode's
1086          * resource usage.
1087          */
1088         dqp->q_ino.count++;
1089         dqp->q_ino.reserved++;
1090         if (nblks) {
1091                 dqp->q_blk.count += nblks;
1092                 dqp->q_blk.reserved += nblks;
1093         }
1094         if (rtblks) {
1095                 dqp->q_rtb.count += rtblks;
1096                 dqp->q_rtb.reserved += rtblks;
1097         }
1098
1099         /*
1100          * Set default limits, adjust timers (since we changed usages)
1101          *
1102          * There are no timers for the default values set in the root dquot.
1103          */
1104         if (dqp->q_id) {
1105                 xfs_qm_adjust_dqlimits(dqp);
1106                 xfs_qm_adjust_dqtimers(dqp);
1107         }
1108
1109         dqp->q_flags |= XFS_DQFLAG_DIRTY;
1110         xfs_qm_dqput(dqp);
1111         return 0;
1112 }
1113
1114 /*
1115  * callback routine supplied to bulkstat(). Given an inumber, find its
1116  * dquots and update them to account for resources taken by that inode.
1117  */
1118 /* ARGSUSED */
1119 STATIC int
1120 xfs_qm_dqusage_adjust(
1121         struct xfs_mount        *mp,
1122         struct xfs_trans        *tp,
1123         xfs_ino_t               ino,
1124         void                    *data)
1125 {
1126         struct xfs_inode        *ip;
1127         xfs_qcnt_t              nblks;
1128         xfs_filblks_t           rtblks = 0;     /* total rt blks */
1129         int                     error;
1130
1131         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1132
1133         /*
1134          * rootino must have its resources accounted for, not so with the quota
1135          * inodes.
1136          */
1137         if (xfs_is_quota_inode(&mp->m_sb, ino))
1138                 return 0;
1139
1140         /*
1141          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1142          * at mount time and therefore nobody will be racing chown/chproj.
1143          */
1144         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1145         if (error == -EINVAL || error == -ENOENT)
1146                 return 0;
1147         if (error)
1148                 return error;
1149
1150         ASSERT(ip->i_delayed_blks == 0);
1151
1152         if (XFS_IS_REALTIME_INODE(ip)) {
1153                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1154
1155                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1156                         error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1157                         if (error)
1158                                 goto error0;
1159                 }
1160
1161                 xfs_bmap_count_leaves(ifp, &rtblks);
1162         }
1163
1164         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1165
1166         /*
1167          * Add the (disk blocks and inode) resources occupied by this
1168          * inode to its dquots. We do this adjustment in the incore dquot,
1169          * and also copy the changes to its buffer.
1170          * We don't care about putting these changes in a transaction
1171          * envelope because if we crash in the middle of a 'quotacheck'
1172          * we have to start from the beginning anyway.
1173          * Once we're done, we'll log all the dquot bufs.
1174          *
1175          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1176          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1177          */
1178         if (XFS_IS_UQUOTA_ON(mp)) {
1179                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_USER, nblks,
1180                                 rtblks);
1181                 if (error)
1182                         goto error0;
1183         }
1184
1185         if (XFS_IS_GQUOTA_ON(mp)) {
1186                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_GROUP, nblks,
1187                                 rtblks);
1188                 if (error)
1189                         goto error0;
1190         }
1191
1192         if (XFS_IS_PQUOTA_ON(mp)) {
1193                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_PROJ, nblks,
1194                                 rtblks);
1195                 if (error)
1196                         goto error0;
1197         }
1198
1199 error0:
1200         xfs_irele(ip);
1201         return error;
1202 }
1203
1204 STATIC int
1205 xfs_qm_flush_one(
1206         struct xfs_dquot        *dqp,
1207         void                    *data)
1208 {
1209         struct xfs_mount        *mp = dqp->q_mount;
1210         struct list_head        *buffer_list = data;
1211         struct xfs_buf          *bp = NULL;
1212         int                     error = 0;
1213
1214         xfs_dqlock(dqp);
1215         if (dqp->q_flags & XFS_DQFLAG_FREEING)
1216                 goto out_unlock;
1217         if (!XFS_DQ_IS_DIRTY(dqp))
1218                 goto out_unlock;
1219
1220         /*
1221          * The only way the dquot is already flush locked by the time quotacheck
1222          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1223          * it for the final time. Quotacheck collects all dquot bufs in the
1224          * local delwri queue before dquots are dirtied, so reclaim can't have
1225          * possibly queued it for I/O. The only way out is to push the buffer to
1226          * cycle the flush lock.
1227          */
1228         if (!xfs_dqflock_nowait(dqp)) {
1229                 /* buf is pinned in-core by delwri list */
1230                 bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1231                                 mp->m_quotainfo->qi_dqchunklen, 0);
1232                 if (!bp) {
1233                         error = -EINVAL;
1234                         goto out_unlock;
1235                 }
1236                 xfs_buf_unlock(bp);
1237
1238                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1239                 xfs_buf_rele(bp);
1240
1241                 error = -EAGAIN;
1242                 goto out_unlock;
1243         }
1244
1245         error = xfs_qm_dqflush(dqp, &bp);
1246         if (error)
1247                 goto out_unlock;
1248
1249         xfs_buf_delwri_queue(bp, buffer_list);
1250         xfs_buf_relse(bp);
1251 out_unlock:
1252         xfs_dqunlock(dqp);
1253         return error;
1254 }
1255
1256 /*
1257  * Walk thru all the filesystem inodes and construct a consistent view
1258  * of the disk quota world. If the quotacheck fails, disable quotas.
1259  */
1260 STATIC int
1261 xfs_qm_quotacheck(
1262         xfs_mount_t     *mp)
1263 {
1264         int                     error, error2;
1265         uint                    flags;
1266         LIST_HEAD               (buffer_list);
1267         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1268         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1269         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1270
1271         flags = 0;
1272
1273         ASSERT(uip || gip || pip);
1274         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1275
1276         xfs_notice(mp, "Quotacheck needed: Please wait.");
1277
1278         /*
1279          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1280          * their counters to zero. We need a clean slate.
1281          * We don't log our changes till later.
1282          */
1283         if (uip) {
1284                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_DQTYPE_USER,
1285                                          &buffer_list);
1286                 if (error)
1287                         goto error_return;
1288                 flags |= XFS_UQUOTA_CHKD;
1289         }
1290
1291         if (gip) {
1292                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_DQTYPE_GROUP,
1293                                          &buffer_list);
1294                 if (error)
1295                         goto error_return;
1296                 flags |= XFS_GQUOTA_CHKD;
1297         }
1298
1299         if (pip) {
1300                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_DQTYPE_PROJ,
1301                                          &buffer_list);
1302                 if (error)
1303                         goto error_return;
1304                 flags |= XFS_PQUOTA_CHKD;
1305         }
1306
1307         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1308                         NULL);
1309         if (error)
1310                 goto error_return;
1311
1312         /*
1313          * We've made all the changes that we need to make incore.  Flush them
1314          * down to disk buffers if everything was updated successfully.
1315          */
1316         if (XFS_IS_UQUOTA_ON(mp)) {
1317                 error = xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_flush_one,
1318                                           &buffer_list);
1319         }
1320         if (XFS_IS_GQUOTA_ON(mp)) {
1321                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_flush_one,
1322                                            &buffer_list);
1323                 if (!error)
1324                         error = error2;
1325         }
1326         if (XFS_IS_PQUOTA_ON(mp)) {
1327                 error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_flush_one,
1328                                            &buffer_list);
1329                 if (!error)
1330                         error = error2;
1331         }
1332
1333         error2 = xfs_buf_delwri_submit(&buffer_list);
1334         if (!error)
1335                 error = error2;
1336
1337         /*
1338          * We can get this error if we couldn't do a dquot allocation inside
1339          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1340          * dirty dquots that might be cached, we just want to get rid of them
1341          * and turn quotaoff. The dquots won't be attached to any of the inodes
1342          * at this point (because we intentionally didn't in dqget_noattach).
1343          */
1344         if (error) {
1345                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1346                 goto error_return;
1347         }
1348
1349         /*
1350          * If one type of quotas is off, then it will lose its
1351          * quotachecked status, since we won't be doing accounting for
1352          * that type anymore.
1353          */
1354         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1355         mp->m_qflags |= flags;
1356
1357  error_return:
1358         xfs_buf_delwri_cancel(&buffer_list);
1359
1360         if (error) {
1361                 xfs_warn(mp,
1362         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1363                         error);
1364                 /*
1365                  * We must turn off quotas.
1366                  */
1367                 ASSERT(mp->m_quotainfo != NULL);
1368                 xfs_qm_destroy_quotainfo(mp);
1369                 if (xfs_mount_reset_sbqflags(mp)) {
1370                         xfs_warn(mp,
1371                                 "Quotacheck: Failed to reset quota flags.");
1372                 }
1373         } else
1374                 xfs_notice(mp, "Quotacheck: Done.");
1375         return error;
1376 }
1377
1378 /*
1379  * This is called from xfs_mountfs to start quotas and initialize all
1380  * necessary data structures like quotainfo.  This is also responsible for
1381  * running a quotacheck as necessary.  We are guaranteed that the superblock
1382  * is consistently read in at this point.
1383  *
1384  * If we fail here, the mount will continue with quota turned off. We don't
1385  * need to inidicate success or failure at all.
1386  */
1387 void
1388 xfs_qm_mount_quotas(
1389         struct xfs_mount        *mp)
1390 {
1391         int                     error = 0;
1392         uint                    sbf;
1393
1394         /*
1395          * If quotas on realtime volumes is not supported, we disable
1396          * quotas immediately.
1397          */
1398         if (mp->m_sb.sb_rextents) {
1399                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1400                 mp->m_qflags = 0;
1401                 goto write_changes;
1402         }
1403
1404         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1405
1406         /*
1407          * Allocate the quotainfo structure inside the mount struct, and
1408          * create quotainode(s), and change/rev superblock if necessary.
1409          */
1410         error = xfs_qm_init_quotainfo(mp);
1411         if (error) {
1412                 /*
1413                  * We must turn off quotas.
1414                  */
1415                 ASSERT(mp->m_quotainfo == NULL);
1416                 mp->m_qflags = 0;
1417                 goto write_changes;
1418         }
1419         /*
1420          * If any of the quotas are not consistent, do a quotacheck.
1421          */
1422         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1423                 error = xfs_qm_quotacheck(mp);
1424                 if (error) {
1425                         /* Quotacheck failed and disabled quotas. */
1426                         return;
1427                 }
1428         }
1429         /*
1430          * If one type of quotas is off, then it will lose its
1431          * quotachecked status, since we won't be doing accounting for
1432          * that type anymore.
1433          */
1434         if (!XFS_IS_UQUOTA_ON(mp))
1435                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1436         if (!XFS_IS_GQUOTA_ON(mp))
1437                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1438         if (!XFS_IS_PQUOTA_ON(mp))
1439                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1440
1441  write_changes:
1442         /*
1443          * We actually don't have to acquire the m_sb_lock at all.
1444          * This can only be called from mount, and that's single threaded. XXX
1445          */
1446         spin_lock(&mp->m_sb_lock);
1447         sbf = mp->m_sb.sb_qflags;
1448         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1449         spin_unlock(&mp->m_sb_lock);
1450
1451         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1452                 if (xfs_sync_sb(mp, false)) {
1453                         /*
1454                          * We could only have been turning quotas off.
1455                          * We aren't in very good shape actually because
1456                          * the incore structures are convinced that quotas are
1457                          * off, but the on disk superblock doesn't know that !
1458                          */
1459                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1460                         xfs_alert(mp, "%s: Superblock update failed!",
1461                                 __func__);
1462                 }
1463         }
1464
1465         if (error) {
1466                 xfs_warn(mp, "Failed to initialize disk quotas.");
1467                 return;
1468         }
1469 }
1470
1471 /*
1472  * This is called after the superblock has been read in and we're ready to
1473  * iget the quota inodes.
1474  */
1475 STATIC int
1476 xfs_qm_init_quotainos(
1477         xfs_mount_t     *mp)
1478 {
1479         struct xfs_inode        *uip = NULL;
1480         struct xfs_inode        *gip = NULL;
1481         struct xfs_inode        *pip = NULL;
1482         int                     error;
1483         uint                    flags = 0;
1484
1485         ASSERT(mp->m_quotainfo);
1486
1487         /*
1488          * Get the uquota and gquota inodes
1489          */
1490         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1491                 if (XFS_IS_UQUOTA_ON(mp) &&
1492                     mp->m_sb.sb_uquotino != NULLFSINO) {
1493                         ASSERT(mp->m_sb.sb_uquotino > 0);
1494                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1495                                              0, 0, &uip);
1496                         if (error)
1497                                 return error;
1498                 }
1499                 if (XFS_IS_GQUOTA_ON(mp) &&
1500                     mp->m_sb.sb_gquotino != NULLFSINO) {
1501                         ASSERT(mp->m_sb.sb_gquotino > 0);
1502                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1503                                              0, 0, &gip);
1504                         if (error)
1505                                 goto error_rele;
1506                 }
1507                 if (XFS_IS_PQUOTA_ON(mp) &&
1508                     mp->m_sb.sb_pquotino != NULLFSINO) {
1509                         ASSERT(mp->m_sb.sb_pquotino > 0);
1510                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1511                                              0, 0, &pip);
1512                         if (error)
1513                                 goto error_rele;
1514                 }
1515         } else {
1516                 flags |= XFS_QMOPT_SBVERSION;
1517         }
1518
1519         /*
1520          * Create the three inodes, if they don't exist already. The changes
1521          * made above will get added to a transaction and logged in one of
1522          * the qino_alloc calls below.  If the device is readonly,
1523          * temporarily switch to read-write to do this.
1524          */
1525         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1526                 error = xfs_qm_qino_alloc(mp, &uip,
1527                                               flags | XFS_QMOPT_UQUOTA);
1528                 if (error)
1529                         goto error_rele;
1530
1531                 flags &= ~XFS_QMOPT_SBVERSION;
1532         }
1533         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1534                 error = xfs_qm_qino_alloc(mp, &gip,
1535                                           flags | XFS_QMOPT_GQUOTA);
1536                 if (error)
1537                         goto error_rele;
1538
1539                 flags &= ~XFS_QMOPT_SBVERSION;
1540         }
1541         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1542                 error = xfs_qm_qino_alloc(mp, &pip,
1543                                           flags | XFS_QMOPT_PQUOTA);
1544                 if (error)
1545                         goto error_rele;
1546         }
1547
1548         mp->m_quotainfo->qi_uquotaip = uip;
1549         mp->m_quotainfo->qi_gquotaip = gip;
1550         mp->m_quotainfo->qi_pquotaip = pip;
1551
1552         return 0;
1553
1554 error_rele:
1555         if (uip)
1556                 xfs_irele(uip);
1557         if (gip)
1558                 xfs_irele(gip);
1559         if (pip)
1560                 xfs_irele(pip);
1561         return error;
1562 }
1563
1564 STATIC void
1565 xfs_qm_destroy_quotainos(
1566         struct xfs_quotainfo    *qi)
1567 {
1568         if (qi->qi_uquotaip) {
1569                 xfs_irele(qi->qi_uquotaip);
1570                 qi->qi_uquotaip = NULL; /* paranoia */
1571         }
1572         if (qi->qi_gquotaip) {
1573                 xfs_irele(qi->qi_gquotaip);
1574                 qi->qi_gquotaip = NULL;
1575         }
1576         if (qi->qi_pquotaip) {
1577                 xfs_irele(qi->qi_pquotaip);
1578                 qi->qi_pquotaip = NULL;
1579         }
1580 }
1581
1582 STATIC void
1583 xfs_qm_dqfree_one(
1584         struct xfs_dquot        *dqp)
1585 {
1586         struct xfs_mount        *mp = dqp->q_mount;
1587         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1588
1589         mutex_lock(&qi->qi_tree_lock);
1590         radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
1591
1592         qi->qi_dquots--;
1593         mutex_unlock(&qi->qi_tree_lock);
1594
1595         xfs_qm_dqdestroy(dqp);
1596 }
1597
1598 /* --------------- utility functions for vnodeops ---------------- */
1599
1600
1601 /*
1602  * Given an inode, a uid, gid and prid make sure that we have
1603  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1604  * quotas by creating this file.
1605  * This also attaches dquot(s) to the given inode after locking it,
1606  * and returns the dquots corresponding to the uid and/or gid.
1607  *
1608  * in   : inode (unlocked)
1609  * out  : udquot, gdquot with references taken and unlocked
1610  */
1611 int
1612 xfs_qm_vop_dqalloc(
1613         struct xfs_inode        *ip,
1614         kuid_t                  uid,
1615         kgid_t                  gid,
1616         prid_t                  prid,
1617         uint                    flags,
1618         struct xfs_dquot        **O_udqpp,
1619         struct xfs_dquot        **O_gdqpp,
1620         struct xfs_dquot        **O_pdqpp)
1621 {
1622         struct xfs_mount        *mp = ip->i_mount;
1623         struct inode            *inode = VFS_I(ip);
1624         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1625         struct xfs_dquot        *uq = NULL;
1626         struct xfs_dquot        *gq = NULL;
1627         struct xfs_dquot        *pq = NULL;
1628         int                     error;
1629         uint                    lockflags;
1630
1631         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1632                 return 0;
1633
1634         lockflags = XFS_ILOCK_EXCL;
1635         xfs_ilock(ip, lockflags);
1636
1637         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1638                 gid = inode->i_gid;
1639
1640         /*
1641          * Attach the dquot(s) to this inode, doing a dquot allocation
1642          * if necessary. The dquot(s) will not be locked.
1643          */
1644         if (XFS_NOT_DQATTACHED(mp, ip)) {
1645                 error = xfs_qm_dqattach_locked(ip, true);
1646                 if (error) {
1647                         xfs_iunlock(ip, lockflags);
1648                         return error;
1649                 }
1650         }
1651
1652         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1653                 if (!uid_eq(inode->i_uid, uid)) {
1654                         /*
1655                          * What we need is the dquot that has this uid, and
1656                          * if we send the inode to dqget, the uid of the inode
1657                          * takes priority over what's sent in the uid argument.
1658                          * We must unlock inode here before calling dqget if
1659                          * we're not sending the inode, because otherwise
1660                          * we'll deadlock by doing trans_reserve while
1661                          * holding ilock.
1662                          */
1663                         xfs_iunlock(ip, lockflags);
1664                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1665                                         XFS_DQTYPE_USER, true, &uq);
1666                         if (error) {
1667                                 ASSERT(error != -ENOENT);
1668                                 return error;
1669                         }
1670                         /*
1671                          * Get the ilock in the right order.
1672                          */
1673                         xfs_dqunlock(uq);
1674                         lockflags = XFS_ILOCK_SHARED;
1675                         xfs_ilock(ip, lockflags);
1676                 } else {
1677                         /*
1678                          * Take an extra reference, because we'll return
1679                          * this to caller
1680                          */
1681                         ASSERT(ip->i_udquot);
1682                         uq = xfs_qm_dqhold(ip->i_udquot);
1683                 }
1684         }
1685         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1686                 if (!gid_eq(inode->i_gid, gid)) {
1687                         xfs_iunlock(ip, lockflags);
1688                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1689                                         XFS_DQTYPE_GROUP, true, &gq);
1690                         if (error) {
1691                                 ASSERT(error != -ENOENT);
1692                                 goto error_rele;
1693                         }
1694                         xfs_dqunlock(gq);
1695                         lockflags = XFS_ILOCK_SHARED;
1696                         xfs_ilock(ip, lockflags);
1697                 } else {
1698                         ASSERT(ip->i_gdquot);
1699                         gq = xfs_qm_dqhold(ip->i_gdquot);
1700                 }
1701         }
1702         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1703                 if (ip->i_d.di_projid != prid) {
1704                         xfs_iunlock(ip, lockflags);
1705                         error = xfs_qm_dqget(mp, (xfs_dqid_t)prid,
1706                                         XFS_DQTYPE_PROJ, true, &pq);
1707                         if (error) {
1708                                 ASSERT(error != -ENOENT);
1709                                 goto error_rele;
1710                         }
1711                         xfs_dqunlock(pq);
1712                         lockflags = XFS_ILOCK_SHARED;
1713                         xfs_ilock(ip, lockflags);
1714                 } else {
1715                         ASSERT(ip->i_pdquot);
1716                         pq = xfs_qm_dqhold(ip->i_pdquot);
1717                 }
1718         }
1719         trace_xfs_dquot_dqalloc(ip);
1720
1721         xfs_iunlock(ip, lockflags);
1722         if (O_udqpp)
1723                 *O_udqpp = uq;
1724         else
1725                 xfs_qm_dqrele(uq);
1726         if (O_gdqpp)
1727                 *O_gdqpp = gq;
1728         else
1729                 xfs_qm_dqrele(gq);
1730         if (O_pdqpp)
1731                 *O_pdqpp = pq;
1732         else
1733                 xfs_qm_dqrele(pq);
1734         return 0;
1735
1736 error_rele:
1737         xfs_qm_dqrele(gq);
1738         xfs_qm_dqrele(uq);
1739         return error;
1740 }
1741
1742 /*
1743  * Actually transfer ownership, and do dquot modifications.
1744  * These were already reserved.
1745  */
1746 struct xfs_dquot *
1747 xfs_qm_vop_chown(
1748         struct xfs_trans        *tp,
1749         struct xfs_inode        *ip,
1750         struct xfs_dquot        **IO_olddq,
1751         struct xfs_dquot        *newdq)
1752 {
1753         struct xfs_dquot        *prevdq;
1754         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1755                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1756
1757
1758         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1759         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1760
1761         /* old dquot */
1762         prevdq = *IO_olddq;
1763         ASSERT(prevdq);
1764         ASSERT(prevdq != newdq);
1765
1766         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1767         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1768
1769         /* the sparkling new dquot */
1770         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1771         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1772
1773         /*
1774          * Take an extra reference, because the inode is going to keep
1775          * this dquot pointer even after the trans_commit.
1776          */
1777         *IO_olddq = xfs_qm_dqhold(newdq);
1778
1779         return prevdq;
1780 }
1781
1782 /*
1783  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1784  */
1785 int
1786 xfs_qm_vop_chown_reserve(
1787         struct xfs_trans        *tp,
1788         struct xfs_inode        *ip,
1789         struct xfs_dquot        *udqp,
1790         struct xfs_dquot        *gdqp,
1791         struct xfs_dquot        *pdqp,
1792         uint                    flags)
1793 {
1794         struct xfs_mount        *mp = ip->i_mount;
1795         uint64_t                delblks;
1796         unsigned int            blkflags;
1797         struct xfs_dquot        *udq_unres = NULL;
1798         struct xfs_dquot        *gdq_unres = NULL;
1799         struct xfs_dquot        *pdq_unres = NULL;
1800         struct xfs_dquot        *udq_delblks = NULL;
1801         struct xfs_dquot        *gdq_delblks = NULL;
1802         struct xfs_dquot        *pdq_delblks = NULL;
1803         int                     error;
1804
1805
1806         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1807         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1808
1809         delblks = ip->i_delayed_blks;
1810         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1811                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1812
1813         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1814             i_uid_read(VFS_I(ip)) != udqp->q_id) {
1815                 udq_delblks = udqp;
1816                 /*
1817                  * If there are delayed allocation blocks, then we have to
1818                  * unreserve those from the old dquot, and add them to the
1819                  * new dquot.
1820                  */
1821                 if (delblks) {
1822                         ASSERT(ip->i_udquot);
1823                         udq_unres = ip->i_udquot;
1824                 }
1825         }
1826         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1827             i_gid_read(VFS_I(ip)) != gdqp->q_id) {
1828                 gdq_delblks = gdqp;
1829                 if (delblks) {
1830                         ASSERT(ip->i_gdquot);
1831                         gdq_unres = ip->i_gdquot;
1832                 }
1833         }
1834
1835         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1836             ip->i_d.di_projid != pdqp->q_id) {
1837                 pdq_delblks = pdqp;
1838                 if (delblks) {
1839                         ASSERT(ip->i_pdquot);
1840                         pdq_unres = ip->i_pdquot;
1841                 }
1842         }
1843
1844         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1845                                 udq_delblks, gdq_delblks, pdq_delblks,
1846                                 ip->i_d.di_nblocks, 1, flags | blkflags);
1847         if (error)
1848                 return error;
1849
1850         /*
1851          * Do the delayed blks reservations/unreservations now. Since, these
1852          * are done without the help of a transaction, if a reservation fails
1853          * its previous reservations won't be automatically undone by trans
1854          * code. So, we have to do it manually here.
1855          */
1856         if (delblks) {
1857                 /*
1858                  * Do the reservations first. Unreservation can't fail.
1859                  */
1860                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1861                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1862                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1863                             udq_delblks, gdq_delblks, pdq_delblks,
1864                             (xfs_qcnt_t)delblks, 0, flags | blkflags);
1865                 if (error)
1866                         return error;
1867                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1868                                 udq_unres, gdq_unres, pdq_unres,
1869                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1870         }
1871
1872         return 0;
1873 }
1874
1875 int
1876 xfs_qm_vop_rename_dqattach(
1877         struct xfs_inode        **i_tab)
1878 {
1879         struct xfs_mount        *mp = i_tab[0]->i_mount;
1880         int                     i;
1881
1882         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1883                 return 0;
1884
1885         for (i = 0; (i < 4 && i_tab[i]); i++) {
1886                 struct xfs_inode        *ip = i_tab[i];
1887                 int                     error;
1888
1889                 /*
1890                  * Watch out for duplicate entries in the table.
1891                  */
1892                 if (i == 0 || ip != i_tab[i-1]) {
1893                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1894                                 error = xfs_qm_dqattach(ip);
1895                                 if (error)
1896                                         return error;
1897                         }
1898                 }
1899         }
1900         return 0;
1901 }
1902
1903 void
1904 xfs_qm_vop_create_dqattach(
1905         struct xfs_trans        *tp,
1906         struct xfs_inode        *ip,
1907         struct xfs_dquot        *udqp,
1908         struct xfs_dquot        *gdqp,
1909         struct xfs_dquot        *pdqp)
1910 {
1911         struct xfs_mount        *mp = tp->t_mountp;
1912
1913         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1914                 return;
1915
1916         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1917
1918         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1919                 ASSERT(ip->i_udquot == NULL);
1920                 ASSERT(i_uid_read(VFS_I(ip)) == udqp->q_id);
1921
1922                 ip->i_udquot = xfs_qm_dqhold(udqp);
1923                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1924         }
1925         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1926                 ASSERT(ip->i_gdquot == NULL);
1927                 ASSERT(i_gid_read(VFS_I(ip)) == gdqp->q_id);
1928
1929                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1930                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1931         }
1932         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1933                 ASSERT(ip->i_pdquot == NULL);
1934                 ASSERT(ip->i_d.di_projid == pdqp->q_id);
1935
1936                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1937                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1938         }
1939 }
1940