fs/xfs/xfs_qm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_bit.h"
  13 #include "xfs_sb.h"
  14 #include "xfs_mount.h"
  15 #include "xfs_inode.h"
  16 #include "xfs_iwalk.h"
  17 #include "xfs_quota.h"
  18 #include "xfs_bmap.h"
  19 #include "xfs_bmap_util.h"
  20 #include "xfs_trans.h"
  21 #include "xfs_trans_space.h"
  22 #include "xfs_qm.h"
  23 #include "xfs_trace.h"
  24 #include "xfs_icache.h"
  25 #include "xfs_error.h"
  26
  27 /*
  28  * The global quota manager. There is only one of these for the entire
  29  * system, _not_ one per file system. XQM keeps track of the overall
  30  * quota functionality, including maintaining the freelist and hash
  31  * tables of dquots.
  32  */
  33 STATIC int      xfs_qm_init_quotainos(struct xfs_mount *mp);
  34 STATIC int      xfs_qm_init_quotainfo(struct xfs_mount *mp);
  35
  36 STATIC void     xfs_qm_destroy_quotainos(struct xfs_quotainfo *qi);
  37 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  38 /*
  39  * We use the batch lookup interface to iterate over the dquots as it
  40  * currently is the only interface into the radix tree code that allows
  41  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  42  * operations is fine as all callers are used either during mount/umount
  43  * or quotaoff.
  44  */
  45 #define XFS_DQ_LOOKUP_BATCH     32
  46
  47 STATIC int
  48 xfs_qm_dquot_walk(
  49         struct xfs_mount        *mp,
  50         int                     type,
  51         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  52         void                    *data)
  53 {
  54         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  55         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  56         uint32_t                next_index;
  57         int                     last_error = 0;
  58         int                     skipped;
  59         int                     nr_found;
  60
  61 restart:
  62         skipped = 0;
  63         next_index = 0;
  64         nr_found = 0;
  65
  66         while (1) {
  67                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  68                 int             error = 0;
  69                 int             i;
  70
  71                 mutex_lock(&qi->qi_tree_lock);
  72                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  73                                         next_index, XFS_DQ_LOOKUP_BATCH);
  74                 if (!nr_found) {
  75                         mutex_unlock(&qi->qi_tree_lock);
  76                         break;
  77                 }
  78
  79                 for (i = 0; i < nr_found; i++) {
  80                         struct xfs_dquot *dqp = batch[i];
  81
  82                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  83
  84                         error = execute(batch[i], data);
  85                         if (error == -EAGAIN) {
  86                                 skipped++;
  87                                 continue;
  88                         }
  89                         if (error && last_error != -EFSCORRUPTED)
  90                                 last_error = error;
  91                 }
  92
  93                 mutex_unlock(&qi->qi_tree_lock);
  94
  95                 /* bail out if the filesystem is corrupted.  */
  96                 if (last_error == -EFSCORRUPTED) {
  97                         skipped = 0;
  98                         break;
  99                 }
 100                 /* we're done if id overflows back to zero */
 101                 if (!next_index)
 102                         break;
 103         }
 104
 105         if (skipped) {
 106                 delay(1);
 107                 goto restart;
 108         }
 109
 110         return last_error;
 111 }
 112
 113
 114 /*
 115  * Purge a dquot from all tracking data structures and free it.
 116  */
 117 STATIC int
 118 xfs_qm_dqpurge(
 119         struct xfs_dquot        *dqp,
 120         void                    *data)
 121 {
 122         struct xfs_mount        *mp = dqp->q_mount;
 123         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 124         int                     error = -EAGAIN;
 125
 126         xfs_dqlock(dqp);
 127         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0)
 128                 goto out_unlock;
 129
 130         dqp->dq_flags |= XFS_DQ_FREEING;
 131
 132         xfs_dqflock(dqp);
 133
 134         /*
 135          * If we are turning this type of quotas off, we don't care
 136          * about the dirty metadata sitting in this dquot. OTOH, if
 137          * we're unmounting, we do care, so we flush it and wait.
 138          */
 139         if (XFS_DQ_IS_DIRTY(dqp)) {
 140                 struct xfs_buf  *bp = NULL;
 141
 142                 /*
 143                  * We don't care about getting disk errors here. We need
 144                  * to purge this dquot anyway, so we go ahead regardless.
 145                  */
 146                 error = xfs_qm_dqflush(dqp, &bp);
 147                 if (!error) {
 148                         error = xfs_bwrite(bp);
 149                         xfs_buf_relse(bp);
 150                 } else if (error == -EAGAIN) {
 151                         goto out_unlock;
 152                 }
 153                 xfs_dqflock(dqp);
 154         }
 155
 156         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 157         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 158                 !test_bit(XFS_LI_IN_AIL, &dqp->q_logitem.qli_item.li_flags));
 159
 160         xfs_dqfunlock(dqp);
 161         xfs_dqunlock(dqp);
 162
 163         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 164                           be32_to_cpu(dqp->q_core.d_id));
 165         qi->qi_dquots--;
 166
 167         /*
 168          * We move dquots to the freelist as soon as their reference count
 169          * hits zero, so it really should be on the freelist here.
 170          */
 171         ASSERT(!list_empty(&dqp->q_lru));
 172         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 173         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 174
 175         xfs_qm_dqdestroy(dqp);
 176         return 0;
 177
 178 out_unlock:
 179         xfs_dqunlock(dqp);
 180         return error;
 181 }
 182
 183 /*
 184  * Purge the dquot cache.
 185  */
 186 void
 187 xfs_qm_dqpurge_all(
 188         struct xfs_mount        *mp,
 189         uint                    flags)
 190 {
 191         if (flags & XFS_QMOPT_UQUOTA)
 192                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 193         if (flags & XFS_QMOPT_GQUOTA)
 194                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 195         if (flags & XFS_QMOPT_PQUOTA)
 196                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 197 }
 198
 199 /*
 200  * Just destroy the quotainfo structure.
 201  */
 202 void
 203 xfs_qm_unmount(
 204         struct xfs_mount        *mp)
 205 {
 206         if (mp->m_quotainfo) {
 207                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 208                 xfs_qm_destroy_quotainfo(mp);
 209         }
 210 }
 211
 212 /*
 213  * Called from the vfsops layer.
 214  */
 215 void
 216 xfs_qm_unmount_quotas(
 217         xfs_mount_t     *mp)
 218 {
 219         /*
 220          * Release the dquots that root inode, et al might be holding,
 221          * before we flush quotas and blow away the quotainfo structure.
 222          */
 223         ASSERT(mp->m_rootip);
 224         xfs_qm_dqdetach(mp->m_rootip);
 225         if (mp->m_rbmip)
 226                 xfs_qm_dqdetach(mp->m_rbmip);
 227         if (mp->m_rsumip)
 228                 xfs_qm_dqdetach(mp->m_rsumip);
 229
 230         /*
 231          * Release the quota inodes.
 232          */
 233         if (mp->m_quotainfo) {
 234                 if (mp->m_quotainfo->qi_uquotaip) {
 235                         xfs_irele(mp->m_quotainfo->qi_uquotaip);
 236                         mp->m_quotainfo->qi_uquotaip = NULL;
 237                 }
 238                 if (mp->m_quotainfo->qi_gquotaip) {
 239                         xfs_irele(mp->m_quotainfo->qi_gquotaip);
 240                         mp->m_quotainfo->qi_gquotaip = NULL;
 241                 }
 242                 if (mp->m_quotainfo->qi_pquotaip) {
 243                         xfs_irele(mp->m_quotainfo->qi_pquotaip);
 244                         mp->m_quotainfo->qi_pquotaip = NULL;
 245                 }
 246         }
 247 }
 248
 249 STATIC int
 250 xfs_qm_dqattach_one(
 251         struct xfs_inode        *ip,
 252         xfs_dqid_t              id,
 253         uint                    type,
 254         bool                    doalloc,
 255         struct xfs_dquot        **IO_idqpp)
 256 {
 257         struct xfs_dquot        *dqp;
 258         int                     error;
 259
 260         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 261         error = 0;
 262
 263         /*
 264          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 265          * or &i_gdquot. This made the code look weird, but made the logic a lot
 266          * simpler.
 267          */
 268         dqp = *IO_idqpp;
 269         if (dqp) {
 270                 trace_xfs_dqattach_found(dqp);
 271                 return 0;
 272         }
 273
 274         /*
 275          * Find the dquot from somewhere. This bumps the reference count of
 276          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 277          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 278          * turned off suddenly.
 279          */
 280         error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
 281         if (error)
 282                 return error;
 283
 284         trace_xfs_dqattach_get(dqp);
 285
 286         /*
 287          * dqget may have dropped and re-acquired the ilock, but it guarantees
 288          * that the dquot returned is the one that should go in the inode.
 289          */
 290         *IO_idqpp = dqp;
 291         xfs_dqunlock(dqp);
 292         return 0;
 293 }
 294
 295 static bool
 296 xfs_qm_need_dqattach(
 297         struct xfs_inode        *ip)
 298 {
 299         struct xfs_mount        *mp = ip->i_mount;
 300
 301         if (!XFS_IS_QUOTA_RUNNING(mp))
 302                 return false;
 303         if (!XFS_IS_QUOTA_ON(mp))
 304                 return false;
 305         if (!XFS_NOT_DQATTACHED(mp, ip))
 306                 return false;
 307         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 308                 return false;
 309         return true;
 310 }
 311
 312 /*
 313  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 314  * into account.
 315  * If @doalloc is true, the dquot(s) will be allocated if needed.
 316  * Inode may get unlocked and relocked in here, and the caller must deal with
 317  * the consequences.
 318  */
 319 int
 320 xfs_qm_dqattach_locked(
 321         xfs_inode_t     *ip,
 322         bool            doalloc)
 323 {
 324         xfs_mount_t     *mp = ip->i_mount;
 325         int             error = 0;
 326
 327         if (!xfs_qm_need_dqattach(ip))
 328                 return 0;
 329
 330         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 331
 332         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 333                 error = xfs_qm_dqattach_one(ip, i_uid_read(VFS_I(ip)),
 334                                 XFS_DQ_USER, doalloc, &ip->i_udquot);
 335                 if (error)
 336                         goto done;
 337                 ASSERT(ip->i_udquot);
 338         }
 339
 340         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 341                 error = xfs_qm_dqattach_one(ip, i_gid_read(VFS_I(ip)),
 342                                 XFS_DQ_GROUP, doalloc, &ip->i_gdquot);
 343                 if (error)
 344                         goto done;
 345                 ASSERT(ip->i_gdquot);
 346         }
 347
 348         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 349                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
 350                                 doalloc, &ip->i_pdquot);
 351                 if (error)
 352                         goto done;
 353                 ASSERT(ip->i_pdquot);
 354         }
 355
 356 done:
 357         /*
 358          * Don't worry about the dquots that we may have attached before any
 359          * error - they'll get detached later if it has not already been done.
 360          */
 361         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 362         return error;
 363 }
 364
 365 int
 366 xfs_qm_dqattach(
 367         struct xfs_inode        *ip)
 368 {
 369         int                     error;
 370
 371         if (!xfs_qm_need_dqattach(ip))
 372                 return 0;
 373
 374         xfs_ilock(ip, XFS_ILOCK_EXCL);
 375         error = xfs_qm_dqattach_locked(ip, false);
 376         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 377
 378         return error;
 379 }
 380
 381 /*
 382  * Release dquots (and their references) if any.
 383  * The inode should be locked EXCL except when this's called by
 384  * xfs_ireclaim.
 385  */
 386 void
 387 xfs_qm_dqdetach(
 388         xfs_inode_t     *ip)
 389 {
 390         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 391                 return;
 392
 393         trace_xfs_dquot_dqdetach(ip);
 394
 395         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 396         if (ip->i_udquot) {
 397                 xfs_qm_dqrele(ip->i_udquot);
 398                 ip->i_udquot = NULL;
 399         }
 400         if (ip->i_gdquot) {
 401                 xfs_qm_dqrele(ip->i_gdquot);
 402                 ip->i_gdquot = NULL;
 403         }
 404         if (ip->i_pdquot) {
 405                 xfs_qm_dqrele(ip->i_pdquot);
 406                 ip->i_pdquot = NULL;
 407         }
 408 }
 409
 410 struct xfs_qm_isolate {
 411         struct list_head        buffers;
 412         struct list_head        dispose;
 413 };
 414
 415 static enum lru_status
 416 xfs_qm_dquot_isolate(
 417         struct list_head        *item,
 418         struct list_lru_one     *lru,
 419         spinlock_t              *lru_lock,
 420         void                    *arg)
 421                 __releases(lru_lock) __acquires(lru_lock)
 422 {
 423         struct xfs_dquot        *dqp = container_of(item,
 424                                                 struct xfs_dquot, q_lru);
 425         struct xfs_qm_isolate   *isol = arg;
 426
 427         if (!xfs_dqlock_nowait(dqp))
 428                 goto out_miss_busy;
 429
 430         /*
 431          * This dquot has acquired a reference in the meantime remove it from
 432          * the freelist and try again.
 433          */
 434         if (dqp->q_nrefs) {
 435                 xfs_dqunlock(dqp);
 436                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 437
 438                 trace_xfs_dqreclaim_want(dqp);
 439                 list_lru_isolate(lru, &dqp->q_lru);
 440                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 441                 return LRU_REMOVED;
 442         }
 443
 444         /*
 445          * If the dquot is dirty, flush it. If it's already being flushed, just
 446          * skip it so there is time for the IO to complete before we try to
 447          * reclaim it again on the next LRU pass.
 448          */
 449         if (!xfs_dqflock_nowait(dqp)) {
 450                 xfs_dqunlock(dqp);
 451                 goto out_miss_busy;
 452         }
 453
 454         if (XFS_DQ_IS_DIRTY(dqp)) {
 455                 struct xfs_buf  *bp = NULL;
 456                 int             error;
 457
 458                 trace_xfs_dqreclaim_dirty(dqp);
 459
 460                 /* we have to drop the LRU lock to flush the dquot */
 461                 spin_unlock(lru_lock);
 462
 463                 error = xfs_qm_dqflush(dqp, &bp);
 464                 if (error)
 465                         goto out_unlock_dirty;
 466
 467                 xfs_buf_delwri_queue(bp, &isol->buffers);
 468                 xfs_buf_relse(bp);
 469                 goto out_unlock_dirty;
 470         }
 471         xfs_dqfunlock(dqp);
 472
 473         /*
 474          * Prevent lookups now that we are past the point of no return.
 475          */
 476         dqp->dq_flags |= XFS_DQ_FREEING;
 477         xfs_dqunlock(dqp);
 478
 479         ASSERT(dqp->q_nrefs == 0);
 480         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 481         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 482         trace_xfs_dqreclaim_done(dqp);
 483         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 484         return LRU_REMOVED;
 485
 486 out_miss_busy:
 487         trace_xfs_dqreclaim_busy(dqp);
 488         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 489         return LRU_SKIP;
 490
 491 out_unlock_dirty:
 492         trace_xfs_dqreclaim_busy(dqp);
 493         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 494         xfs_dqunlock(dqp);
 495         spin_lock(lru_lock);
 496         return LRU_RETRY;
 497 }
 498
 499 static unsigned long
 500 xfs_qm_shrink_scan(
 501         struct shrinker         *shrink,
 502         struct shrink_control   *sc)
 503 {
 504         struct xfs_quotainfo    *qi = container_of(shrink,
 505                                         struct xfs_quotainfo, qi_shrinker);
 506         struct xfs_qm_isolate   isol;
 507         unsigned long           freed;
 508         int                     error;
 509
 510         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 511                 return 0;
 512
 513         INIT_LIST_HEAD(&isol.buffers);
 514         INIT_LIST_HEAD(&isol.dispose);
 515
 516         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 517                                      xfs_qm_dquot_isolate, &isol);
 518
 519         error = xfs_buf_delwri_submit(&isol.buffers);
 520         if (error)
 521                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 522
 523         while (!list_empty(&isol.dispose)) {
 524                 struct xfs_dquot        *dqp;
 525
 526                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 527                 list_del_init(&dqp->q_lru);
 528                 xfs_qm_dqfree_one(dqp);
 529         }
 530
 531         return freed;
 532 }
 533
 534 static unsigned long
 535 xfs_qm_shrink_count(
 536         struct shrinker         *shrink,
 537         struct shrink_control   *sc)
 538 {
 539         struct xfs_quotainfo    *qi = container_of(shrink,
 540                                         struct xfs_quotainfo, qi_shrinker);
 541
 542         return list_lru_shrink_count(&qi->qi_lru, sc);
 543 }
 544
 545 STATIC void
 546 xfs_qm_set_defquota(
 547         struct xfs_mount        *mp,
 548         uint                    type,
 549         struct xfs_quotainfo    *qinf)
 550 {
 551         struct xfs_dquot        *dqp;
 552         struct xfs_def_quota    *defq;
 553         struct xfs_disk_dquot   *ddqp;
 554         int                     error;
 555
 556         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 557         if (error)
 558                 return;
 559
 560         ddqp = &dqp->q_core;
 561         defq = xfs_get_defquota(qinf, xfs_dquot_type(dqp));
 562
 563         /*
 564          * Timers and warnings have been already set, let's just set the
 565          * default limits for this quota type
 566          */
 567         defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 568         defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 569         defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 570         defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 571         defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 572         defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 573         xfs_qm_dqdestroy(dqp);
 574 }
 575
 576 /* Initialize quota time limits from the root dquot. */
 577 static void
 578 xfs_qm_init_timelimits(
 579         struct xfs_mount        *mp,
 580         uint                    type)
 581 {
 582         struct xfs_quotainfo    *qinf = mp->m_quotainfo;
 583         struct xfs_def_quota    *defq;
 584         struct xfs_disk_dquot   *ddqp;
 585         struct xfs_dquot        *dqp;
 586         int                     error;
 587
 588         defq = xfs_get_defquota(qinf, type);
 589
 590         defq->btimelimit = XFS_QM_BTIMELIMIT;
 591         defq->itimelimit = XFS_QM_ITIMELIMIT;
 592         defq->rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 593         defq->bwarnlimit = XFS_QM_BWARNLIMIT;
 594         defq->iwarnlimit = XFS_QM_IWARNLIMIT;
 595         defq->rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 596
 597         /*
 598          * We try to get the limits from the superuser's limits fields.
 599          * This is quite hacky, but it is standard quota practice.
 600          *
 601          * Since we may not have done a quotacheck by this point, just read
 602          * the dquot without attaching it to any hashtables or lists.
 603          */
 604         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 605         if (error)
 606                 return;
 607
 608         ddqp = &dqp->q_core;
 609
 610         /*
 611          * The warnings and timers set the grace period given to
 612          * a user or group before he or she can not perform any
 613          * more writing. If it is zero, a default is used.
 614          */
 615         if (ddqp->d_btimer)
 616                 defq->btimelimit = be32_to_cpu(ddqp->d_btimer);
 617         if (ddqp->d_itimer)
 618                 defq->itimelimit = be32_to_cpu(ddqp->d_itimer);
 619         if (ddqp->d_rtbtimer)
 620                 defq->rtbtimelimit = be32_to_cpu(ddqp->d_rtbtimer);
 621         if (ddqp->d_bwarns)
 622                 defq->bwarnlimit = be16_to_cpu(ddqp->d_bwarns);
 623         if (ddqp->d_iwarns)
 624                 defq->iwarnlimit = be16_to_cpu(ddqp->d_iwarns);
 625         if (ddqp->d_rtbwarns)
 626                 defq->rtbwarnlimit = be16_to_cpu(ddqp->d_rtbwarns);
 627
 628         xfs_qm_dqdestroy(dqp);
 629 }
 630
 631 /*
 632  * This initializes all the quota information that's kept in the
 633  * mount structure
 634  */
 635 STATIC int
 636 xfs_qm_init_quotainfo(
 637         struct xfs_mount        *mp)
 638 {
 639         struct xfs_quotainfo    *qinf;
 640         int                     error;
 641
 642         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 643
 644         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
 645
 646         error = list_lru_init(&qinf->qi_lru);
 647         if (error)
 648                 goto out_free_qinf;
 649
 650         /*
 651          * See if quotainodes are setup, and if not, allocate them,
 652          * and change the superblock accordingly.
 653          */
 654         error = xfs_qm_init_quotainos(mp);
 655         if (error)
 656                 goto out_free_lru;
 657
 658         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 659         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 660         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 661         mutex_init(&qinf->qi_tree_lock);
 662
 663         /* mutex used to serialize quotaoffs */
 664         mutex_init(&qinf->qi_quotaofflock);
 665
 666         /* Precalc some constants */
 667         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 668         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 669
 670         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 671
 672         xfs_qm_init_timelimits(mp, XFS_DQ_USER);
 673         xfs_qm_init_timelimits(mp, XFS_DQ_GROUP);
 674         xfs_qm_init_timelimits(mp, XFS_DQ_PROJ);
 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                         need_alloc ? XFS_QM_QINOCREATE_SPACE_RES(mp) : 0,
 780                         0, 0, &tp);
 781         if (error)
 782                 return error;
 783
 784         if (need_alloc) {
 785                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
 786                 if (error) {
 787                         xfs_trans_cancel(tp);
 788                         return error;
 789                 }
 790         }
 791
 792         /*
 793          * Make the changes in the superblock, and log those too.
 794          * sbfields arg may contain fields other than *QUOTINO;
 795          * VERSIONNUM for example.
 796          */
 797         spin_lock(&mp->m_sb_lock);
 798         if (flags & XFS_QMOPT_SBVERSION) {
 799                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 800
 801                 xfs_sb_version_addquota(&mp->m_sb);
 802                 mp->m_sb.sb_uquotino = NULLFSINO;
 803                 mp->m_sb.sb_gquotino = NULLFSINO;
 804                 mp->m_sb.sb_pquotino = NULLFSINO;
 805
 806                 /* qflags will get updated fully _after_ quotacheck */
 807                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 808         }
 809         if (flags & XFS_QMOPT_UQUOTA)
 810                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 811         else if (flags & XFS_QMOPT_GQUOTA)
 812                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 813         else
 814                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 815         spin_unlock(&mp->m_sb_lock);
 816         xfs_log_sb(tp);
 817
 818         error = xfs_trans_commit(tp);
 819         if (error) {
 820                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 821                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 822         }
 823         if (need_alloc)
 824                 xfs_finish_inode_setup(*ip);
 825         return error;
 826 }
 827
 828
 829 STATIC void
 830 xfs_qm_reset_dqcounts(
 831         xfs_mount_t     *mp,
 832         xfs_buf_t       *bp,
 833         xfs_dqid_t      id,
 834         uint            type)
 835 {
 836         struct xfs_dqblk        *dqb;
 837         int                     j;
 838         xfs_failaddr_t          fa;
 839
 840         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 841
 842         /*
 843          * Reset all counters and timers. They'll be
 844          * started afresh by xfs_qm_quotacheck.
 845          */
 846 #ifdef DEBUG
 847         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 848                 sizeof(xfs_dqblk_t);
 849         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 850 #endif
 851         dqb = bp->b_addr;
 852         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 853                 struct xfs_disk_dquot   *ddq;
 854
 855                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 856
 857                 /*
 858                  * Do a sanity check, and if needed, repair the dqblk. Don't
 859                  * output any warnings because it's perfectly possible to
 860                  * find uninitialised dquot blks. See comment in
 861                  * xfs_dquot_verify.
 862                  */
 863                 fa = xfs_dqblk_verify(mp, &dqb[j], id + j, type);
 864                 if (fa)
 865                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 866
 867                 /*
 868                  * Reset type in case we are reusing group quota file for
 869                  * project quotas or vice versa
 870                  */
 871                 ddq->d_flags = type;
 872                 ddq->d_bcount = 0;
 873                 ddq->d_icount = 0;
 874                 ddq->d_rtbcount = 0;
 875
 876                 /*
 877                  * dquot id 0 stores the default grace period and the maximum
 878                  * warning limit that were set by the administrator, so we
 879                  * should not reset them.
 880                  */
 881                 if (ddq->d_id != 0) {
 882                         ddq->d_btimer = 0;
 883                         ddq->d_itimer = 0;
 884                         ddq->d_rtbtimer = 0;
 885                         ddq->d_bwarns = 0;
 886                         ddq->d_iwarns = 0;
 887                         ddq->d_rtbwarns = 0;
 888                 }
 889
 890                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 891                         xfs_update_cksum((char *)&dqb[j],
 892                                          sizeof(struct xfs_dqblk),
 893                                          XFS_DQUOT_CRC_OFF);
 894                 }
 895         }
 896 }
 897
 898 STATIC int
 899 xfs_qm_reset_dqcounts_all(
 900         struct xfs_mount        *mp,
 901         xfs_dqid_t              firstid,
 902         xfs_fsblock_t           bno,
 903         xfs_filblks_t           blkcnt,
 904         uint                    flags,
 905         struct list_head        *buffer_list)
 906 {
 907         struct xfs_buf          *bp;
 908         int                     error;
 909         int                     type;
 910
 911         ASSERT(blkcnt > 0);
 912         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 913                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 914         error = 0;
 915
 916         /*
 917          * Blkcnt arg can be a very big number, and might even be
 918          * larger than the log itself. So, we have to break it up into
 919          * manageable-sized transactions.
 920          * Note that we don't start a permanent transaction here; we might
 921          * not be able to get a log reservation for the whole thing up front,
 922          * and we don't really care to either, because we just discard
 923          * everything if we were to crash in the middle of this loop.
 924          */
 925         while (blkcnt--) {
 926                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 927                               XFS_FSB_TO_DADDR(mp, bno),
 928                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 929                               &xfs_dquot_buf_ops);
 930
 931                 /*
 932                  * CRC and validation errors will return a EFSCORRUPTED here. If
 933                  * this occurs, re-read without CRC validation so that we can
 934                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 935                  * will leave a trace in the log indicating corruption has
 936                  * been detected.
 937                  */
 938                 if (error == -EFSCORRUPTED) {
 939                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 940                                       XFS_FSB_TO_DADDR(mp, bno),
 941                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 942                                       NULL);
 943                 }
 944
 945                 if (error)
 946                         break;
 947
 948                 /*
 949                  * A corrupt buffer might not have a verifier attached, so
 950                  * make sure we have the correct one attached before writeback
 951                  * occurs.
 952                  */
 953                 bp->b_ops = &xfs_dquot_buf_ops;
 954                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 955                 xfs_buf_delwri_queue(bp, buffer_list);
 956                 xfs_buf_relse(bp);
 957
 958                 /* goto the next block. */
 959                 bno++;
 960                 firstid += mp->m_quotainfo->qi_dqperchunk;
 961         }
 962
 963         return error;
 964 }
 965
 966 /*
 967  * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 968  * counters for every chunk of dquots that we find.
 969  */
 970 STATIC int
 971 xfs_qm_reset_dqcounts_buf(
 972         struct xfs_mount        *mp,
 973         struct xfs_inode        *qip,
 974         uint                    flags,
 975         struct list_head        *buffer_list)
 976 {
 977         struct xfs_bmbt_irec    *map;
 978         int                     i, nmaps;       /* number of map entries */
 979         int                     error;          /* return value */
 980         xfs_fileoff_t           lblkno;
 981         xfs_filblks_t           maxlblkcnt;
 982         xfs_dqid_t              firstid;
 983         xfs_fsblock_t           rablkno;
 984         xfs_filblks_t           rablkcnt;
 985
 986         error = 0;
 987         /*
 988          * This looks racy, but we can't keep an inode lock across a
 989          * trans_reserve. But, this gets called during quotacheck, and that
 990          * happens only at mount time which is single threaded.
 991          */
 992         if (qip->i_d.di_nblocks == 0)
 993                 return 0;
 994
 995         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
 996
 997         lblkno = 0;
 998         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 999         do {
1000                 uint            lock_mode;
1001
1002                 nmaps = XFS_DQITER_MAP_SIZE;
1003                 /*
1004                  * We aren't changing the inode itself. Just changing
1005                  * some of its data. No new blocks are added here, and
1006                  * the inode is never added to the transaction.
1007                  */
1008                 lock_mode = xfs_ilock_data_map_shared(qip);
1009                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1010                                        map, &nmaps, 0);
1011                 xfs_iunlock(qip, lock_mode);
1012                 if (error)
1013                         break;
1014
1015                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1016                 for (i = 0; i < nmaps; i++) {
1017                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1018                         ASSERT(map[i].br_blockcount);
1019
1020
1021                         lblkno += map[i].br_blockcount;
1022
1023                         if (map[i].br_startblock == HOLESTARTBLOCK)
1024                                 continue;
1025
1026                         firstid = (xfs_dqid_t) map[i].br_startoff *
1027                                 mp->m_quotainfo->qi_dqperchunk;
1028                         /*
1029                          * Do a read-ahead on the next extent.
1030                          */
1031                         if ((i+1 < nmaps) &&
1032                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1033                                 rablkcnt =  map[i+1].br_blockcount;
1034                                 rablkno = map[i+1].br_startblock;
1035                                 while (rablkcnt--) {
1036                                         xfs_buf_readahead(mp->m_ddev_targp,
1037                                                XFS_FSB_TO_DADDR(mp, rablkno),
1038                                                mp->m_quotainfo->qi_dqchunklen,
1039                                                &xfs_dquot_buf_ops);
1040                                         rablkno++;
1041                                 }
1042                         }
1043                         /*
1044                          * Iterate thru all the blks in the extent and
1045                          * reset the counters of all the dquots inside them.
1046                          */
1047                         error = xfs_qm_reset_dqcounts_all(mp, firstid,
1048                                                    map[i].br_startblock,
1049                                                    map[i].br_blockcount,
1050                                                    flags, buffer_list);
1051                         if (error)
1052                                 goto out;
1053                 }
1054         } while (nmaps > 0);
1055
1056 out:
1057         kmem_free(map);
1058         return error;
1059 }
1060
1061 /*
1062  * Called by dqusage_adjust in doing a quotacheck.
1063  *
1064  * Given the inode, and a dquot id this updates both the incore dqout as well
1065  * as the buffer copy. This is so that once the quotacheck is done, we can
1066  * just log all the buffers, as opposed to logging numerous updates to
1067  * individual dquots.
1068  */
1069 STATIC int
1070 xfs_qm_quotacheck_dqadjust(
1071         struct xfs_inode        *ip,
1072         uint                    type,
1073         xfs_qcnt_t              nblks,
1074         xfs_qcnt_t              rtblks)
1075 {
1076         struct xfs_mount        *mp = ip->i_mount;
1077         struct xfs_dquot        *dqp;
1078         xfs_dqid_t              id;
1079         int                     error;
1080
1081         id = xfs_qm_id_for_quotatype(ip, type);
1082         error = xfs_qm_dqget(mp, id, type, true, &dqp);
1083         if (error) {
1084                 /*
1085                  * Shouldn't be able to turn off quotas here.
1086                  */
1087                 ASSERT(error != -ESRCH);
1088                 ASSERT(error != -ENOENT);
1089                 return error;
1090         }
1091
1092         trace_xfs_dqadjust(dqp);
1093
1094         /*
1095          * Adjust the inode count and the block count to reflect this inode's
1096          * resource usage.
1097          */
1098         be64_add_cpu(&dqp->q_core.d_icount, 1);
1099         dqp->q_res_icount++;
1100         if (nblks) {
1101                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1102                 dqp->q_res_bcount += nblks;
1103         }
1104         if (rtblks) {
1105                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1106                 dqp->q_res_rtbcount += rtblks;
1107         }
1108
1109         /*
1110          * Set default limits, adjust timers (since we changed usages)
1111          *
1112          * There are no timers for the default values set in the root dquot.
1113          */
1114         if (dqp->q_core.d_id) {
1115                 xfs_qm_adjust_dqlimits(mp, dqp);
1116                 xfs_qm_adjust_dqtimers(mp, dqp);
1117         }
1118
1119         dqp->dq_flags |= XFS_DQ_DIRTY;
1120         xfs_qm_dqput(dqp);
1121         return 0;
1122 }
1123
1124 /*
1125  * callback routine supplied to bulkstat(). Given an inumber, find its
1126  * dquots and update them to account for resources taken by that inode.
1127  */
1128 /* ARGSUSED */
1129 STATIC int
1130 xfs_qm_dqusage_adjust(
1131         struct xfs_mount        *mp,
1132         struct xfs_trans        *tp,
1133         xfs_ino_t               ino,
1134         void                    *data)
1135 {
1136         struct xfs_inode        *ip;
1137         xfs_qcnt_t              nblks;
1138         xfs_filblks_t           rtblks = 0;     /* total rt blks */
1139         int                     error;
1140
1141         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1142
1143         /*
1144          * rootino must have its resources accounted for, not so with the quota
1145          * inodes.
1146          */
1147         if (xfs_is_quota_inode(&mp->m_sb, ino))
1148                 return 0;
1149
1150         /*
1151          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1152          * at mount time and therefore nobody will be racing chown/chproj.
1153          */
1154         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1155         if (error == -EINVAL || error == -ENOENT)
1156                 return 0;
1157         if (error)
1158                 return error;
1159
1160         ASSERT(ip->i_delayed_blks == 0);
1161
1162         if (XFS_IS_REALTIME_INODE(ip)) {
1163                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1164
1165                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1166                         error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1167                         if (error)
1168                                 goto error0;
1169                 }
1170
1171                 xfs_bmap_count_leaves(ifp, &rtblks);
1172         }
1173
1174         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1175
1176         /*
1177          * Add the (disk blocks and inode) resources occupied by this
1178          * inode to its dquots. We do this adjustment in the incore dquot,
1179          * and also copy the changes to its buffer.
1180          * We don't care about putting these changes in a transaction
1181          * envelope because if we crash in the middle of a 'quotacheck'
1182          * we have to start from the beginning anyway.
1183          * Once we're done, we'll log all the dquot bufs.
1184          *
1185          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1186          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1187          */
1188         if (XFS_IS_UQUOTA_ON(mp)) {
1189                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_USER, nblks,
1190                                 rtblks);
1191                 if (error)
1192                         goto error0;
1193         }
1194
1195         if (XFS_IS_GQUOTA_ON(mp)) {
1196                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_GROUP, nblks,
1197                                 rtblks);
1198                 if (error)
1199                         goto error0;
1200         }
1201
1202         if (XFS_IS_PQUOTA_ON(mp)) {
1203                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_PROJ, nblks,
1204                                 rtblks);
1205                 if (error)
1206                         goto error0;
1207         }
1208
1209 error0:
1210         xfs_irele(ip);
1211         return error;
1212 }
1213
1214 STATIC int
1215 xfs_qm_flush_one(
1216         struct xfs_dquot        *dqp,
1217         void                    *data)
1218 {
1219         struct xfs_mount        *mp = dqp->q_mount;
1220         struct list_head        *buffer_list = data;
1221         struct xfs_buf          *bp = NULL;
1222         int                     error = 0;
1223
1224         xfs_dqlock(dqp);
1225         if (dqp->dq_flags & XFS_DQ_FREEING)
1226                 goto out_unlock;
1227         if (!XFS_DQ_IS_DIRTY(dqp))
1228                 goto out_unlock;
1229
1230         /*
1231          * The only way the dquot is already flush locked by the time quotacheck
1232          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1233          * it for the final time. Quotacheck collects all dquot bufs in the
1234          * local delwri queue before dquots are dirtied, so reclaim can't have
1235          * possibly queued it for I/O. The only way out is to push the buffer to
1236          * cycle the flush lock.
1237          */
1238         if (!xfs_dqflock_nowait(dqp)) {
1239                 /* buf is pinned in-core by delwri list */
1240                 bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1241                                 mp->m_quotainfo->qi_dqchunklen, 0);
1242                 if (!bp) {
1243                         error = -EINVAL;
1244                         goto out_unlock;
1245                 }
1246                 xfs_buf_unlock(bp);
1247
1248                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1249                 xfs_buf_rele(bp);
1250
1251                 error = -EAGAIN;
1252                 goto out_unlock;
1253         }
1254
1255         error = xfs_qm_dqflush(dqp, &bp);
1256         if (error)
1257                 goto out_unlock;
1258
1259         xfs_buf_delwri_queue(bp, buffer_list);
1260         xfs_buf_relse(bp);
1261 out_unlock:
1262         xfs_dqunlock(dqp);
1263         return error;
1264 }
1265
1266 /*
1267  * Walk thru all the filesystem inodes and construct a consistent view
1268  * of the disk quota world. If the quotacheck fails, disable quotas.
1269  */
1270 STATIC int
1271 xfs_qm_quotacheck(
1272         xfs_mount_t     *mp)
1273 {
1274         int                     error, error2;
1275         uint                    flags;
1276         LIST_HEAD               (buffer_list);
1277         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1278         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1279         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1280
1281         flags = 0;
1282
1283         ASSERT(uip || gip || pip);
1284         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1285
1286         xfs_notice(mp, "Quotacheck needed: Please wait.");
1287
1288         /*
1289          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1290          * their counters to zero. We need a clean slate.
1291          * We don't log our changes till later.
1292          */
1293         if (uip) {
1294                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_QMOPT_UQUOTA,
1295                                          &buffer_list);
1296                 if (error)
1297                         goto error_return;
1298                 flags |= XFS_UQUOTA_CHKD;
1299         }
1300
1301         if (gip) {
1302                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_QMOPT_GQUOTA,
1303                                          &buffer_list);
1304                 if (error)
1305                         goto error_return;
1306                 flags |= XFS_GQUOTA_CHKD;
1307         }
1308
1309         if (pip) {
1310                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_QMOPT_PQUOTA,
1311                                          &buffer_list);
1312                 if (error)
1313                         goto error_return;
1314                 flags |= XFS_PQUOTA_CHKD;
1315         }
1316
1317         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1318                         NULL);
1319         if (error)
1320                 goto error_return;
1321
1322         /*
1323          * We've made all the changes that we need to make incore.  Flush them
1324          * down to disk buffers if everything was updated successfully.
1325          */
1326         if (XFS_IS_UQUOTA_ON(mp)) {
1327                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1328                                           &buffer_list);
1329         }
1330         if (XFS_IS_GQUOTA_ON(mp)) {
1331                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1332                                            &buffer_list);
1333                 if (!error)
1334                         error = error2;
1335         }
1336         if (XFS_IS_PQUOTA_ON(mp)) {
1337                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1338                                            &buffer_list);
1339                 if (!error)
1340                         error = error2;
1341         }
1342
1343         error2 = xfs_buf_delwri_submit(&buffer_list);
1344         if (!error)
1345                 error = error2;
1346
1347         /*
1348          * We can get this error if we couldn't do a dquot allocation inside
1349          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1350          * dirty dquots that might be cached, we just want to get rid of them
1351          * and turn quotaoff. The dquots won't be attached to any of the inodes
1352          * at this point (because we intentionally didn't in dqget_noattach).
1353          */
1354         if (error) {
1355                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1356                 goto error_return;
1357         }
1358
1359         /*
1360          * If one type of quotas is off, then it will lose its
1361          * quotachecked status, since we won't be doing accounting for
1362          * that type anymore.
1363          */
1364         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1365         mp->m_qflags |= flags;
1366
1367  error_return:
1368         xfs_buf_delwri_cancel(&buffer_list);
1369
1370         if (error) {
1371                 xfs_warn(mp,
1372         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1373                         error);
1374                 /*
1375                  * We must turn off quotas.
1376                  */
1377                 ASSERT(mp->m_quotainfo != NULL);
1378                 xfs_qm_destroy_quotainfo(mp);
1379                 if (xfs_mount_reset_sbqflags(mp)) {
1380                         xfs_warn(mp,
1381                                 "Quotacheck: Failed to reset quota flags.");
1382                 }
1383         } else
1384                 xfs_notice(mp, "Quotacheck: Done.");
1385         return error;
1386 }
1387
1388 /*
1389  * This is called from xfs_mountfs to start quotas and initialize all
1390  * necessary data structures like quotainfo.  This is also responsible for
1391  * running a quotacheck as necessary.  We are guaranteed that the superblock
1392  * is consistently read in at this point.
1393  *
1394  * If we fail here, the mount will continue with quota turned off. We don't
1395  * need to inidicate success or failure at all.
1396  */
1397 void
1398 xfs_qm_mount_quotas(
1399         struct xfs_mount        *mp)
1400 {
1401         int                     error = 0;
1402         uint                    sbf;
1403
1404         /*
1405          * If quotas on realtime volumes is not supported, we disable
1406          * quotas immediately.
1407          */
1408         if (mp->m_sb.sb_rextents) {
1409                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1410                 mp->m_qflags = 0;
1411                 goto write_changes;
1412         }
1413
1414         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1415
1416         /*
1417          * Allocate the quotainfo structure inside the mount struct, and
1418          * create quotainode(s), and change/rev superblock if necessary.
1419          */
1420         error = xfs_qm_init_quotainfo(mp);
1421         if (error) {
1422                 /*
1423                  * We must turn off quotas.
1424                  */
1425                 ASSERT(mp->m_quotainfo == NULL);
1426                 mp->m_qflags = 0;
1427                 goto write_changes;
1428         }
1429         /*
1430          * If any of the quotas are not consistent, do a quotacheck.
1431          */
1432         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1433                 error = xfs_qm_quotacheck(mp);
1434                 if (error) {
1435                         /* Quotacheck failed and disabled quotas. */
1436                         return;
1437                 }
1438         }
1439         /*
1440          * If one type of quotas is off, then it will lose its
1441          * quotachecked status, since we won't be doing accounting for
1442          * that type anymore.
1443          */
1444         if (!XFS_IS_UQUOTA_ON(mp))
1445                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1446         if (!XFS_IS_GQUOTA_ON(mp))
1447                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1448         if (!XFS_IS_PQUOTA_ON(mp))
1449                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1450
1451  write_changes:
1452         /*
1453          * We actually don't have to acquire the m_sb_lock at all.
1454          * This can only be called from mount, and that's single threaded. XXX
1455          */
1456         spin_lock(&mp->m_sb_lock);
1457         sbf = mp->m_sb.sb_qflags;
1458         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1459         spin_unlock(&mp->m_sb_lock);
1460
1461         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1462                 if (xfs_sync_sb(mp, false)) {
1463                         /*
1464                          * We could only have been turning quotas off.
1465                          * We aren't in very good shape actually because
1466                          * the incore structures are convinced that quotas are
1467                          * off, but the on disk superblock doesn't know that !
1468                          */
1469                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1470                         xfs_alert(mp, "%s: Superblock update failed!",
1471                                 __func__);
1472                 }
1473         }
1474
1475         if (error) {
1476                 xfs_warn(mp, "Failed to initialize disk quotas.");
1477                 return;
1478         }
1479 }
1480
1481 /*
1482  * This is called after the superblock has been read in and we're ready to
1483  * iget the quota inodes.
1484  */
1485 STATIC int
1486 xfs_qm_init_quotainos(
1487         xfs_mount_t     *mp)
1488 {
1489         struct xfs_inode        *uip = NULL;
1490         struct xfs_inode        *gip = NULL;
1491         struct xfs_inode        *pip = NULL;
1492         int                     error;
1493         uint                    flags = 0;
1494
1495         ASSERT(mp->m_quotainfo);
1496
1497         /*
1498          * Get the uquota and gquota inodes
1499          */
1500         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1501                 if (XFS_IS_UQUOTA_ON(mp) &&
1502                     mp->m_sb.sb_uquotino != NULLFSINO) {
1503                         ASSERT(mp->m_sb.sb_uquotino > 0);
1504                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1505                                              0, 0, &uip);
1506                         if (error)
1507                                 return error;
1508                 }
1509                 if (XFS_IS_GQUOTA_ON(mp) &&
1510                     mp->m_sb.sb_gquotino != NULLFSINO) {
1511                         ASSERT(mp->m_sb.sb_gquotino > 0);
1512                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1513                                              0, 0, &gip);
1514                         if (error)
1515                                 goto error_rele;
1516                 }
1517                 if (XFS_IS_PQUOTA_ON(mp) &&
1518                     mp->m_sb.sb_pquotino != NULLFSINO) {
1519                         ASSERT(mp->m_sb.sb_pquotino > 0);
1520                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1521                                              0, 0, &pip);
1522                         if (error)
1523                                 goto error_rele;
1524                 }
1525         } else {
1526                 flags |= XFS_QMOPT_SBVERSION;
1527         }
1528
1529         /*
1530          * Create the three inodes, if they don't exist already. The changes
1531          * made above will get added to a transaction and logged in one of
1532          * the qino_alloc calls below.  If the device is readonly,
1533          * temporarily switch to read-write to do this.
1534          */
1535         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1536                 error = xfs_qm_qino_alloc(mp, &uip,
1537                                               flags | XFS_QMOPT_UQUOTA);
1538                 if (error)
1539                         goto error_rele;
1540
1541                 flags &= ~XFS_QMOPT_SBVERSION;
1542         }
1543         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1544                 error = xfs_qm_qino_alloc(mp, &gip,
1545                                           flags | XFS_QMOPT_GQUOTA);
1546                 if (error)
1547                         goto error_rele;
1548
1549                 flags &= ~XFS_QMOPT_SBVERSION;
1550         }
1551         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1552                 error = xfs_qm_qino_alloc(mp, &pip,
1553                                           flags | XFS_QMOPT_PQUOTA);
1554                 if (error)
1555                         goto error_rele;
1556         }
1557
1558         mp->m_quotainfo->qi_uquotaip = uip;
1559         mp->m_quotainfo->qi_gquotaip = gip;
1560         mp->m_quotainfo->qi_pquotaip = pip;
1561
1562         return 0;
1563
1564 error_rele:
1565         if (uip)
1566                 xfs_irele(uip);
1567         if (gip)
1568                 xfs_irele(gip);
1569         if (pip)
1570                 xfs_irele(pip);
1571         return error;
1572 }
1573
1574 STATIC void
1575 xfs_qm_destroy_quotainos(
1576         struct xfs_quotainfo    *qi)
1577 {
1578         if (qi->qi_uquotaip) {
1579                 xfs_irele(qi->qi_uquotaip);
1580                 qi->qi_uquotaip = NULL; /* paranoia */
1581         }
1582         if (qi->qi_gquotaip) {
1583                 xfs_irele(qi->qi_gquotaip);
1584                 qi->qi_gquotaip = NULL;
1585         }
1586         if (qi->qi_pquotaip) {
1587                 xfs_irele(qi->qi_pquotaip);
1588                 qi->qi_pquotaip = NULL;
1589         }
1590 }
1591
1592 STATIC void
1593 xfs_qm_dqfree_one(
1594         struct xfs_dquot        *dqp)
1595 {
1596         struct xfs_mount        *mp = dqp->q_mount;
1597         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1598
1599         mutex_lock(&qi->qi_tree_lock);
1600         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1601                           be32_to_cpu(dqp->q_core.d_id));
1602
1603         qi->qi_dquots--;
1604         mutex_unlock(&qi->qi_tree_lock);
1605
1606         xfs_qm_dqdestroy(dqp);
1607 }
1608
1609 /* --------------- utility functions for vnodeops ---------------- */
1610
1611
1612 /*
1613  * Given an inode, a uid, gid and prid make sure that we have
1614  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1615  * quotas by creating this file.
1616  * This also attaches dquot(s) to the given inode after locking it,
1617  * and returns the dquots corresponding to the uid and/or gid.
1618  *
1619  * in   : inode (unlocked)
1620  * out  : udquot, gdquot with references taken and unlocked
1621  */
1622 int
1623 xfs_qm_vop_dqalloc(
1624         struct xfs_inode        *ip,
1625         kuid_t                  uid,
1626         kgid_t                  gid,
1627         prid_t                  prid,
1628         uint                    flags,
1629         struct xfs_dquot        **O_udqpp,
1630         struct xfs_dquot        **O_gdqpp,
1631         struct xfs_dquot        **O_pdqpp)
1632 {
1633         struct xfs_mount        *mp = ip->i_mount;
1634         struct inode            *inode = VFS_I(ip);
1635         struct user_namespace   *user_ns = inode->i_sb->s_user_ns;
1636         struct xfs_dquot        *uq = NULL;
1637         struct xfs_dquot        *gq = NULL;
1638         struct xfs_dquot        *pq = NULL;
1639         int                     error;
1640         uint                    lockflags;
1641
1642         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1643                 return 0;
1644
1645         lockflags = XFS_ILOCK_EXCL;
1646         xfs_ilock(ip, lockflags);
1647
1648         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1649                 gid = inode->i_gid;
1650
1651         /*
1652          * Attach the dquot(s) to this inode, doing a dquot allocation
1653          * if necessary. The dquot(s) will not be locked.
1654          */
1655         if (XFS_NOT_DQATTACHED(mp, ip)) {
1656                 error = xfs_qm_dqattach_locked(ip, true);
1657                 if (error) {
1658                         xfs_iunlock(ip, lockflags);
1659                         return error;
1660                 }
1661         }
1662
1663         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1664                 if (!uid_eq(inode->i_uid, uid)) {
1665                         /*
1666                          * What we need is the dquot that has this uid, and
1667                          * if we send the inode to dqget, the uid of the inode
1668                          * takes priority over what's sent in the uid argument.
1669                          * We must unlock inode here before calling dqget if
1670                          * we're not sending the inode, because otherwise
1671                          * we'll deadlock by doing trans_reserve while
1672                          * holding ilock.
1673                          */
1674                         xfs_iunlock(ip, lockflags);
1675                         error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
1676                                         XFS_DQ_USER, true, &uq);
1677                         if (error) {
1678                                 ASSERT(error != -ENOENT);
1679                                 return error;
1680                         }
1681                         /*
1682                          * Get the ilock in the right order.
1683                          */
1684                         xfs_dqunlock(uq);
1685                         lockflags = XFS_ILOCK_SHARED;
1686                         xfs_ilock(ip, lockflags);
1687                 } else {
1688                         /*
1689                          * Take an extra reference, because we'll return
1690                          * this to caller
1691                          */
1692                         ASSERT(ip->i_udquot);
1693                         uq = xfs_qm_dqhold(ip->i_udquot);
1694                 }
1695         }
1696         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1697                 if (!gid_eq(inode->i_gid, gid)) {
1698                         xfs_iunlock(ip, lockflags);
1699                         error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
1700                                         XFS_DQ_GROUP, true, &gq);
1701                         if (error) {
1702                                 ASSERT(error != -ENOENT);
1703                                 goto error_rele;
1704                         }
1705                         xfs_dqunlock(gq);
1706                         lockflags = XFS_ILOCK_SHARED;
1707                         xfs_ilock(ip, lockflags);
1708                 } else {
1709                         ASSERT(ip->i_gdquot);
1710                         gq = xfs_qm_dqhold(ip->i_gdquot);
1711                 }
1712         }
1713         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1714                 if (ip->i_d.di_projid != prid) {
1715                         xfs_iunlock(ip, lockflags);
1716                         error = xfs_qm_dqget(mp, (xfs_dqid_t)prid, XFS_DQ_PROJ,
1717                                         true, &pq);
1718                         if (error) {
1719                                 ASSERT(error != -ENOENT);
1720                                 goto error_rele;
1721                         }
1722                         xfs_dqunlock(pq);
1723                         lockflags = XFS_ILOCK_SHARED;
1724                         xfs_ilock(ip, lockflags);
1725                 } else {
1726                         ASSERT(ip->i_pdquot);
1727                         pq = xfs_qm_dqhold(ip->i_pdquot);
1728                 }
1729         }
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;
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                 pdq_delblks = pdqp;
1849                 if (delblks) {
1850                         ASSERT(ip->i_pdquot);
1851                         pdq_unres = ip->i_pdquot;
1852                 }
1853         }
1854
1855         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1856                                 udq_delblks, gdq_delblks, pdq_delblks,
1857                                 ip->i_d.di_nblocks, 1, flags | blkflags);
1858         if (error)
1859                 return error;
1860
1861         /*
1862          * Do the delayed blks reservations/unreservations now. Since, these
1863          * are done without the help of a transaction, if a reservation fails
1864          * its previous reservations won't be automatically undone by trans
1865          * code. So, we have to do it manually here.
1866          */
1867         if (delblks) {
1868                 /*
1869                  * Do the reservations first. Unreservation can't fail.
1870                  */
1871                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1872                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1873                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1874                             udq_delblks, gdq_delblks, pdq_delblks,
1875                             (xfs_qcnt_t)delblks, 0, flags | blkflags);
1876                 if (error)
1877                         return error;
1878                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1879                                 udq_unres, gdq_unres, pdq_unres,
1880                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1881         }
1882
1883         return 0;
1884 }
1885
1886 int
1887 xfs_qm_vop_rename_dqattach(
1888         struct xfs_inode        **i_tab)
1889 {
1890         struct xfs_mount        *mp = i_tab[0]->i_mount;
1891         int                     i;
1892
1893         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1894                 return 0;
1895
1896         for (i = 0; (i < 4 && i_tab[i]); i++) {
1897                 struct xfs_inode        *ip = i_tab[i];
1898                 int                     error;
1899
1900                 /*
1901                  * Watch out for duplicate entries in the table.
1902                  */
1903                 if (i == 0 || ip != i_tab[i-1]) {
1904                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1905                                 error = xfs_qm_dqattach(ip);
1906                                 if (error)
1907                                         return error;
1908                         }
1909                 }
1910         }
1911         return 0;
1912 }
1913
1914 void
1915 xfs_qm_vop_create_dqattach(
1916         struct xfs_trans        *tp,
1917         struct xfs_inode        *ip,
1918         struct xfs_dquot        *udqp,
1919         struct xfs_dquot        *gdqp,
1920         struct xfs_dquot        *pdqp)
1921 {
1922         struct xfs_mount        *mp = tp->t_mountp;
1923
1924         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1925                 return;
1926
1927         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1928
1929         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1930                 ASSERT(ip->i_udquot == NULL);
1931                 ASSERT(i_uid_read(VFS_I(ip)) == be32_to_cpu(udqp->q_core.d_id));
1932
1933                 ip->i_udquot = xfs_qm_dqhold(udqp);
1934                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1935         }
1936         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1937                 ASSERT(ip->i_gdquot == NULL);
1938                 ASSERT(i_gid_read(VFS_I(ip)) == be32_to_cpu(gdqp->q_core.d_id));
1939
1940                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1941                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1942         }
1943         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1944                 ASSERT(ip->i_pdquot == NULL);
1945                 ASSERT(ip->i_d.di_projid == be32_to_cpu(pdqp->q_core.d_id));
1946
1947                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1948                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1949         }
1950 }
1951