fs/xfs/xfs_qm.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_inode.h"
  28 #include "xfs_ialloc.h"
  29 #include "xfs_itable.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_error.h"
  32 #include "xfs_bmap.h"
  33 #include "xfs_bmap_btree.h"
  34 #include "xfs_bmap_util.h"
  35 #include "xfs_trans.h"
  36 #include "xfs_trans_space.h"
  37 #include "xfs_qm.h"
  38 #include "xfs_trace.h"
  39 #include "xfs_icache.h"
  40 #include "xfs_cksum.h"
  41
  42 /*
  43  * The global quota manager. There is only one of these for the entire
  44  * system, _not_ one per file system. XQM keeps track of the overall
  45  * quota functionality, including maintaining the freelist and hash
  46  * tables of dquots.
  47  */
  48 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  49 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  50
  51
  52 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  53 /*
  54  * We use the batch lookup interface to iterate over the dquots as it
  55  * currently is the only interface into the radix tree code that allows
  56  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  57  * operations is fine as all callers are used either during mount/umount
  58  * or quotaoff.
  59  */
  60 #define XFS_DQ_LOOKUP_BATCH     32
  61
  62 STATIC int
  63 xfs_qm_dquot_walk(
  64         struct xfs_mount        *mp,
  65         int                     type,
  66         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  67         void                    *data)
  68 {
  69         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  70         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  71         uint32_t                next_index;
  72         int                     last_error = 0;
  73         int                     skipped;
  74         int                     nr_found;
  75
  76 restart:
  77         skipped = 0;
  78         next_index = 0;
  79         nr_found = 0;
  80
  81         while (1) {
  82                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  83                 int             error = 0;
  84                 int             i;
  85
  86                 mutex_lock(&qi->qi_tree_lock);
  87                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  88                                         next_index, XFS_DQ_LOOKUP_BATCH);
  89                 if (!nr_found) {
  90                         mutex_unlock(&qi->qi_tree_lock);
  91                         break;
  92                 }
  93
  94                 for (i = 0; i < nr_found; i++) {
  95                         struct xfs_dquot *dqp = batch[i];
  96
  97                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  98
  99                         error = execute(batch[i], data);
 100                         if (error == -EAGAIN) {
 101                                 skipped++;
 102                                 continue;
 103                         }
 104                         if (error && last_error != -EFSCORRUPTED)
 105                                 last_error = error;
 106                 }
 107
 108                 mutex_unlock(&qi->qi_tree_lock);
 109
 110                 /* bail out if the filesystem is corrupted.  */
 111                 if (last_error == -EFSCORRUPTED) {
 112                         skipped = 0;
 113                         break;
 114                 }
 115                 /* we're done if id overflows back to zero */
 116                 if (!next_index)
 117                         break;
 118         }
 119
 120         if (skipped) {
 121                 delay(1);
 122                 goto restart;
 123         }
 124
 125         return last_error;
 126 }
 127
 128
 129 /*
 130  * Purge a dquot from all tracking data structures and free it.
 131  */
 132 STATIC int
 133 xfs_qm_dqpurge(
 134         struct xfs_dquot        *dqp,
 135         void                    *data)
 136 {
 137         struct xfs_mount        *mp = dqp->q_mount;
 138         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 139
 140         xfs_dqlock(dqp);
 141         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 142                 xfs_dqunlock(dqp);
 143                 return -EAGAIN;
 144         }
 145
 146         dqp->dq_flags |= XFS_DQ_FREEING;
 147
 148         xfs_dqflock(dqp);
 149
 150         /*
 151          * If we are turning this type of quotas off, we don't care
 152          * about the dirty metadata sitting in this dquot. OTOH, if
 153          * we're unmounting, we do care, so we flush it and wait.
 154          */
 155         if (XFS_DQ_IS_DIRTY(dqp)) {
 156                 struct xfs_buf  *bp = NULL;
 157                 int             error;
 158
 159                 /*
 160                  * We don't care about getting disk errors here. We need
 161                  * to purge this dquot anyway, so we go ahead regardless.
 162                  */
 163                 error = xfs_qm_dqflush(dqp, &bp);
 164                 if (error) {
 165                         xfs_warn(mp, "%s: dquot %p flush failed",
 166                                 __func__, dqp);
 167                 } else {
 168                         error = xfs_bwrite(bp);
 169                         xfs_buf_relse(bp);
 170                 }
 171                 xfs_dqflock(dqp);
 172         }
 173
 174         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 175         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 176                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 177
 178         xfs_dqfunlock(dqp);
 179         xfs_dqunlock(dqp);
 180
 181         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 182                           be32_to_cpu(dqp->q_core.d_id));
 183         qi->qi_dquots--;
 184
 185         /*
 186          * We move dquots to the freelist as soon as their reference count
 187          * hits zero, so it really should be on the freelist here.
 188          */
 189         ASSERT(!list_empty(&dqp->q_lru));
 190         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 191         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 192
 193         xfs_qm_dqdestroy(dqp);
 194         return 0;
 195 }
 196
 197 /*
 198  * Purge the dquot cache.
 199  */
 200 void
 201 xfs_qm_dqpurge_all(
 202         struct xfs_mount        *mp,
 203         uint                    flags)
 204 {
 205         if (flags & XFS_QMOPT_UQUOTA)
 206                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 207         if (flags & XFS_QMOPT_GQUOTA)
 208                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 209         if (flags & XFS_QMOPT_PQUOTA)
 210                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 211 }
 212
 213 /*
 214  * Just destroy the quotainfo structure.
 215  */
 216 void
 217 xfs_qm_unmount(
 218         struct xfs_mount        *mp)
 219 {
 220         if (mp->m_quotainfo) {
 221                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 222                 xfs_qm_destroy_quotainfo(mp);
 223         }
 224 }
 225
 226 /*
 227  * Called from the vfsops layer.
 228  */
 229 void
 230 xfs_qm_unmount_quotas(
 231         xfs_mount_t     *mp)
 232 {
 233         /*
 234          * Release the dquots that root inode, et al might be holding,
 235          * before we flush quotas and blow away the quotainfo structure.
 236          */
 237         ASSERT(mp->m_rootip);
 238         xfs_qm_dqdetach(mp->m_rootip);
 239         if (mp->m_rbmip)
 240                 xfs_qm_dqdetach(mp->m_rbmip);
 241         if (mp->m_rsumip)
 242                 xfs_qm_dqdetach(mp->m_rsumip);
 243
 244         /*
 245          * Release the quota inodes.
 246          */
 247         if (mp->m_quotainfo) {
 248                 if (mp->m_quotainfo->qi_uquotaip) {
 249                         IRELE(mp->m_quotainfo->qi_uquotaip);
 250                         mp->m_quotainfo->qi_uquotaip = NULL;
 251                 }
 252                 if (mp->m_quotainfo->qi_gquotaip) {
 253                         IRELE(mp->m_quotainfo->qi_gquotaip);
 254                         mp->m_quotainfo->qi_gquotaip = NULL;
 255                 }
 256                 if (mp->m_quotainfo->qi_pquotaip) {
 257                         IRELE(mp->m_quotainfo->qi_pquotaip);
 258                         mp->m_quotainfo->qi_pquotaip = NULL;
 259                 }
 260         }
 261 }
 262
 263 STATIC int
 264 xfs_qm_dqattach_one(
 265         xfs_inode_t     *ip,
 266         xfs_dqid_t      id,
 267         uint            type,
 268         uint            doalloc,
 269         xfs_dquot_t     **IO_idqpp)
 270 {
 271         xfs_dquot_t     *dqp;
 272         int             error;
 273
 274         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 275         error = 0;
 276
 277         /*
 278          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 279          * or &i_gdquot. This made the code look weird, but made the logic a lot
 280          * simpler.
 281          */
 282         dqp = *IO_idqpp;
 283         if (dqp) {
 284                 trace_xfs_dqattach_found(dqp);
 285                 return 0;
 286         }
 287
 288         /*
 289          * Find the dquot from somewhere. This bumps the reference count of
 290          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 291          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 292          * turned off suddenly.
 293          */
 294         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 295                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 296         if (error)
 297                 return error;
 298
 299         trace_xfs_dqattach_get(dqp);
 300
 301         /*
 302          * dqget may have dropped and re-acquired the ilock, but it guarantees
 303          * that the dquot returned is the one that should go in the inode.
 304          */
 305         *IO_idqpp = dqp;
 306         xfs_dqunlock(dqp);
 307         return 0;
 308 }
 309
 310 static bool
 311 xfs_qm_need_dqattach(
 312         struct xfs_inode        *ip)
 313 {
 314         struct xfs_mount        *mp = ip->i_mount;
 315
 316         if (!XFS_IS_QUOTA_RUNNING(mp))
 317                 return false;
 318         if (!XFS_IS_QUOTA_ON(mp))
 319                 return false;
 320         if (!XFS_NOT_DQATTACHED(mp, ip))
 321                 return false;
 322         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 323                 return false;
 324         return true;
 325 }
 326
 327 /*
 328  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 329  * into account.
 330  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 331  * Inode may get unlocked and relocked in here, and the caller must deal with
 332  * the consequences.
 333  */
 334 int
 335 xfs_qm_dqattach_locked(
 336         xfs_inode_t     *ip,
 337         uint            flags)
 338 {
 339         xfs_mount_t     *mp = ip->i_mount;
 340         int             error = 0;
 341
 342         if (!xfs_qm_need_dqattach(ip))
 343                 return 0;
 344
 345         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 346
 347         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 348                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 349                                                 flags & XFS_QMOPT_DQALLOC,
 350                                                 &ip->i_udquot);
 351                 if (error)
 352                         goto done;
 353                 ASSERT(ip->i_udquot);
 354         }
 355
 356         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 357                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 358                                                 flags & XFS_QMOPT_DQALLOC,
 359                                                 &ip->i_gdquot);
 360                 if (error)
 361                         goto done;
 362                 ASSERT(ip->i_gdquot);
 363         }
 364
 365         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 366                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 367                                                 flags & XFS_QMOPT_DQALLOC,
 368                                                 &ip->i_pdquot);
 369                 if (error)
 370                         goto done;
 371                 ASSERT(ip->i_pdquot);
 372         }
 373
 374 done:
 375         /*
 376          * Don't worry about the dquots that we may have attached before any
 377          * error - they'll get detached later if it has not already been done.
 378          */
 379         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 380         return error;
 381 }
 382
 383 int
 384 xfs_qm_dqattach(
 385         struct xfs_inode        *ip,
 386         uint                    flags)
 387 {
 388         int                     error;
 389
 390         if (!xfs_qm_need_dqattach(ip))
 391                 return 0;
 392
 393         xfs_ilock(ip, XFS_ILOCK_EXCL);
 394         error = xfs_qm_dqattach_locked(ip, flags);
 395         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 396
 397         return error;
 398 }
 399
 400 /*
 401  * Release dquots (and their references) if any.
 402  * The inode should be locked EXCL except when this's called by
 403  * xfs_ireclaim.
 404  */
 405 void
 406 xfs_qm_dqdetach(
 407         xfs_inode_t     *ip)
 408 {
 409         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 410                 return;
 411
 412         trace_xfs_dquot_dqdetach(ip);
 413
 414         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 415         if (ip->i_udquot) {
 416                 xfs_qm_dqrele(ip->i_udquot);
 417                 ip->i_udquot = NULL;
 418         }
 419         if (ip->i_gdquot) {
 420                 xfs_qm_dqrele(ip->i_gdquot);
 421                 ip->i_gdquot = NULL;
 422         }
 423         if (ip->i_pdquot) {
 424                 xfs_qm_dqrele(ip->i_pdquot);
 425                 ip->i_pdquot = NULL;
 426         }
 427 }
 428
 429 struct xfs_qm_isolate {
 430         struct list_head        buffers;
 431         struct list_head        dispose;
 432 };
 433
 434 static enum lru_status
 435 xfs_qm_dquot_isolate(
 436         struct list_head        *item,
 437         struct list_lru_one     *lru,
 438         spinlock_t              *lru_lock,
 439         void                    *arg)
 440                 __releases(lru_lock) __acquires(lru_lock)
 441 {
 442         struct xfs_dquot        *dqp = container_of(item,
 443                                                 struct xfs_dquot, q_lru);
 444         struct xfs_qm_isolate   *isol = arg;
 445
 446         if (!xfs_dqlock_nowait(dqp))
 447                 goto out_miss_busy;
 448
 449         /*
 450          * This dquot has acquired a reference in the meantime remove it from
 451          * the freelist and try again.
 452          */
 453         if (dqp->q_nrefs) {
 454                 xfs_dqunlock(dqp);
 455                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 456
 457                 trace_xfs_dqreclaim_want(dqp);
 458                 list_lru_isolate(lru, &dqp->q_lru);
 459                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 460                 return LRU_REMOVED;
 461         }
 462
 463         /*
 464          * If the dquot is dirty, flush it. If it's already being flushed, just
 465          * skip it so there is time for the IO to complete before we try to
 466          * reclaim it again on the next LRU pass.
 467          */
 468         if (!xfs_dqflock_nowait(dqp)) {
 469                 xfs_dqunlock(dqp);
 470                 goto out_miss_busy;
 471         }
 472
 473         if (XFS_DQ_IS_DIRTY(dqp)) {
 474                 struct xfs_buf  *bp = NULL;
 475                 int             error;
 476
 477                 trace_xfs_dqreclaim_dirty(dqp);
 478
 479                 /* we have to drop the LRU lock to flush the dquot */
 480                 spin_unlock(lru_lock);
 481
 482                 error = xfs_qm_dqflush(dqp, &bp);
 483                 if (error) {
 484                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 485                                  __func__, dqp);
 486                         goto out_unlock_dirty;
 487                 }
 488
 489                 xfs_buf_delwri_queue(bp, &isol->buffers);
 490                 xfs_buf_relse(bp);
 491                 goto out_unlock_dirty;
 492         }
 493         xfs_dqfunlock(dqp);
 494
 495         /*
 496          * Prevent lookups now that we are past the point of no return.
 497          */
 498         dqp->dq_flags |= XFS_DQ_FREEING;
 499         xfs_dqunlock(dqp);
 500
 501         ASSERT(dqp->q_nrefs == 0);
 502         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 503         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 504         trace_xfs_dqreclaim_done(dqp);
 505         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 506         return LRU_REMOVED;
 507
 508 out_miss_busy:
 509         trace_xfs_dqreclaim_busy(dqp);
 510         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 511         return LRU_SKIP;
 512
 513 out_unlock_dirty:
 514         trace_xfs_dqreclaim_busy(dqp);
 515         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 516         xfs_dqunlock(dqp);
 517         spin_lock(lru_lock);
 518         return LRU_RETRY;
 519 }
 520
 521 static unsigned long
 522 xfs_qm_shrink_scan(
 523         struct shrinker         *shrink,
 524         struct shrink_control   *sc)
 525 {
 526         struct xfs_quotainfo    *qi = container_of(shrink,
 527                                         struct xfs_quotainfo, qi_shrinker);
 528         struct xfs_qm_isolate   isol;
 529         unsigned long           freed;
 530         int                     error;
 531
 532         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 533                 return 0;
 534
 535         INIT_LIST_HEAD(&isol.buffers);
 536         INIT_LIST_HEAD(&isol.dispose);
 537
 538         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 539                                      xfs_qm_dquot_isolate, &isol);
 540
 541         error = xfs_buf_delwri_submit(&isol.buffers);
 542         if (error)
 543                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 544
 545         while (!list_empty(&isol.dispose)) {
 546                 struct xfs_dquot        *dqp;
 547
 548                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 549                 list_del_init(&dqp->q_lru);
 550                 xfs_qm_dqfree_one(dqp);
 551         }
 552
 553         return freed;
 554 }
 555
 556 static unsigned long
 557 xfs_qm_shrink_count(
 558         struct shrinker         *shrink,
 559         struct shrink_control   *sc)
 560 {
 561         struct xfs_quotainfo    *qi = container_of(shrink,
 562                                         struct xfs_quotainfo, qi_shrinker);
 563
 564         return list_lru_shrink_count(&qi->qi_lru, sc);
 565 }
 566
 567 STATIC void
 568 xfs_qm_set_defquota(
 569         xfs_mount_t     *mp,
 570         uint            type,
 571         xfs_quotainfo_t *qinf)
 572 {
 573         xfs_dquot_t             *dqp;
 574         struct xfs_def_quota    *defq;
 575         int                     error;
 576
 577         error = xfs_qm_dqread(mp, 0, type, XFS_QMOPT_DOWARN, &dqp);
 578
 579         if (!error) {
 580                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 581
 582                 defq = xfs_get_defquota(dqp, qinf);
 583
 584                 /*
 585                  * Timers and warnings have been already set, let's just set the
 586                  * default limits for this quota type
 587                  */
 588                 defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 589                 defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 590                 defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 591                 defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 592                 defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 593                 defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 594                 xfs_qm_dqdestroy(dqp);
 595         }
 596 }
 597
 598 /*
 599  * This initializes all the quota information that's kept in the
 600  * mount structure
 601  */
 602 STATIC int
 603 xfs_qm_init_quotainfo(
 604         xfs_mount_t     *mp)
 605 {
 606         xfs_quotainfo_t *qinf;
 607         int             error;
 608         xfs_dquot_t     *dqp;
 609
 610         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 611
 612         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 613
 614         error = list_lru_init(&qinf->qi_lru);
 615         if (error)
 616                 goto out_free_qinf;
 617
 618         /*
 619          * See if quotainodes are setup, and if not, allocate them,
 620          * and change the superblock accordingly.
 621          */
 622         error = xfs_qm_init_quotainos(mp);
 623         if (error)
 624                 goto out_free_lru;
 625
 626         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 627         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 628         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 629         mutex_init(&qinf->qi_tree_lock);
 630
 631         /* mutex used to serialize quotaoffs */
 632         mutex_init(&qinf->qi_quotaofflock);
 633
 634         /* Precalc some constants */
 635         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 636         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 637
 638         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 639
 640         /*
 641          * We try to get the limits from the superuser's limits fields.
 642          * This is quite hacky, but it is standard quota practice.
 643          *
 644          * Since we may not have done a quotacheck by this point, just read
 645          * the dquot without attaching it to any hashtables or lists.
 646          *
 647          * Timers and warnings are globally set by the first timer found in
 648          * user/group/proj quota types, otherwise a default value is used.
 649          * This should be split into different fields per quota type.
 650          */
 651         error = xfs_qm_dqread(mp, 0,
 652                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 653                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 654                           XFS_DQ_PROJ),
 655                         XFS_QMOPT_DOWARN, &dqp);
 656
 657         if (!error) {
 658                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 659
 660                 /*
 661                  * The warnings and timers set the grace period given to
 662                  * a user or group before he or she can not perform any
 663                  * more writing. If it is zero, a default is used.
 664                  */
 665                 qinf->qi_btimelimit = ddqp->d_btimer ?
 666                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 667                 qinf->qi_itimelimit = ddqp->d_itimer ?
 668                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 669                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 670                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 671                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 672                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 673                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 674                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 675                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 676                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 677                 xfs_qm_dqdestroy(dqp);
 678         } else {
 679                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 680                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 681                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 682                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 683                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 684                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 685         }
 686
 687         if (XFS_IS_UQUOTA_RUNNING(mp))
 688                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 689         if (XFS_IS_GQUOTA_RUNNING(mp))
 690                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 691         if (XFS_IS_PQUOTA_RUNNING(mp))
 692                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 693
 694         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 695         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 696         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 697         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 698         register_shrinker(&qinf->qi_shrinker);
 699         return 0;
 700
 701 out_free_lru:
 702         list_lru_destroy(&qinf->qi_lru);
 703 out_free_qinf:
 704         kmem_free(qinf);
 705         mp->m_quotainfo = NULL;
 706         return error;
 707 }
 708
 709
 710 /*
 711  * Gets called when unmounting a filesystem or when all quotas get
 712  * turned off.
 713  * This purges the quota inodes, destroys locks and frees itself.
 714  */
 715 void
 716 xfs_qm_destroy_quotainfo(
 717         xfs_mount_t     *mp)
 718 {
 719         xfs_quotainfo_t *qi;
 720
 721         qi = mp->m_quotainfo;
 722         ASSERT(qi != NULL);
 723
 724         unregister_shrinker(&qi->qi_shrinker);
 725         list_lru_destroy(&qi->qi_lru);
 726
 727         if (qi->qi_uquotaip) {
 728                 IRELE(qi->qi_uquotaip);
 729                 qi->qi_uquotaip = NULL; /* paranoia */
 730         }
 731         if (qi->qi_gquotaip) {
 732                 IRELE(qi->qi_gquotaip);
 733                 qi->qi_gquotaip = NULL;
 734         }
 735         if (qi->qi_pquotaip) {
 736                 IRELE(qi->qi_pquotaip);
 737                 qi->qi_pquotaip = NULL;
 738         }
 739         mutex_destroy(&qi->qi_quotaofflock);
 740         kmem_free(qi);
 741         mp->m_quotainfo = NULL;
 742 }
 743
 744 /*
 745  * Create an inode and return with a reference already taken, but unlocked
 746  * This is how we create quota inodes
 747  */
 748 STATIC int
 749 xfs_qm_qino_alloc(
 750         xfs_mount_t     *mp,
 751         xfs_inode_t     **ip,
 752         uint            flags)
 753 {
 754         xfs_trans_t     *tp;
 755         int             error;
 756         int             committed;
 757         bool            need_alloc = true;
 758
 759         *ip = NULL;
 760         /*
 761          * With superblock that doesn't have separate pquotino, we
 762          * share an inode between gquota and pquota. If the on-disk
 763          * superblock has GQUOTA and the filesystem is now mounted
 764          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 765          * vice-versa.
 766          */
 767         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 768                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 769                 xfs_ino_t ino = NULLFSINO;
 770
 771                 if ((flags & XFS_QMOPT_PQUOTA) &&
 772                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 773                         ino = mp->m_sb.sb_gquotino;
 774                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 775                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 776                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 777                         ino = mp->m_sb.sb_pquotino;
 778                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 779                 }
 780                 if (ino != NULLFSINO) {
 781                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 782                         if (error)
 783                                 return error;
 784                         mp->m_sb.sb_gquotino = NULLFSINO;
 785                         mp->m_sb.sb_pquotino = NULLFSINO;
 786                         need_alloc = false;
 787                 }
 788         }
 789
 790         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 791                         XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 792         if (error)
 793                 return error;
 794
 795         if (need_alloc) {
 796                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 797                                                                 &committed);
 798                 if (error) {
 799                         xfs_trans_cancel(tp);
 800                         return error;
 801                 }
 802         }
 803
 804         /*
 805          * Make the changes in the superblock, and log those too.
 806          * sbfields arg may contain fields other than *QUOTINO;
 807          * VERSIONNUM for example.
 808          */
 809         spin_lock(&mp->m_sb_lock);
 810         if (flags & XFS_QMOPT_SBVERSION) {
 811                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 812
 813                 xfs_sb_version_addquota(&mp->m_sb);
 814                 mp->m_sb.sb_uquotino = NULLFSINO;
 815                 mp->m_sb.sb_gquotino = NULLFSINO;
 816                 mp->m_sb.sb_pquotino = NULLFSINO;
 817
 818                 /* qflags will get updated fully _after_ quotacheck */
 819                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 820         }
 821         if (flags & XFS_QMOPT_UQUOTA)
 822                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 823         else if (flags & XFS_QMOPT_GQUOTA)
 824                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 825         else
 826                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 827         spin_unlock(&mp->m_sb_lock);
 828         xfs_log_sb(tp);
 829
 830         error = xfs_trans_commit(tp);
 831         if (error) {
 832                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 833                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 834         }
 835         if (need_alloc)
 836                 xfs_finish_inode_setup(*ip);
 837         return error;
 838 }
 839
 840
 841 STATIC void
 842 xfs_qm_reset_dqcounts(
 843         xfs_mount_t     *mp,
 844         xfs_buf_t       *bp,
 845         xfs_dqid_t      id,
 846         uint            type)
 847 {
 848         struct xfs_dqblk        *dqb;
 849         int                     j;
 850
 851         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 852
 853         /*
 854          * Reset all counters and timers. They'll be
 855          * started afresh by xfs_qm_quotacheck.
 856          */
 857 #ifdef DEBUG
 858         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 859                 sizeof(xfs_dqblk_t);
 860         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 861 #endif
 862         dqb = bp->b_addr;
 863         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 864                 struct xfs_disk_dquot   *ddq;
 865
 866                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 867
 868                 /*
 869                  * Do a sanity check, and if needed, repair the dqblk. Don't
 870                  * output any warnings because it's perfectly possible to
 871                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 872                  */
 873                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 874                             "xfs_quotacheck");
 875                 /*
 876                  * Reset type in case we are reusing group quota file for
 877                  * project quotas or vice versa
 878                  */
 879                 ddq->d_flags = type;
 880                 ddq->d_bcount = 0;
 881                 ddq->d_icount = 0;
 882                 ddq->d_rtbcount = 0;
 883                 ddq->d_btimer = 0;
 884                 ddq->d_itimer = 0;
 885                 ddq->d_rtbtimer = 0;
 886                 ddq->d_bwarns = 0;
 887                 ddq->d_iwarns = 0;
 888                 ddq->d_rtbwarns = 0;
 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_dqiter_bufs(
 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 USR/GRP/PRJ dquots in the system, calling a
 968  * caller supplied function for every chunk of dquots that we find.
 969  */
 970 STATIC int
 971 xfs_qm_dqiterate(
 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), KM_SLEEP);
 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_dqiter_bufs(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         xfs_dqid_t              id,
1073         uint                    type,
1074         xfs_qcnt_t              nblks,
1075         xfs_qcnt_t              rtblks)
1076 {
1077         struct xfs_mount        *mp = ip->i_mount;
1078         struct xfs_dquot        *dqp;
1079         int                     error;
1080
1081         error = xfs_qm_dqget(mp, ip, id, type,
1082                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &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->q_core);
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         xfs_mount_t     *mp,            /* mount point for filesystem */
1132         xfs_ino_t       ino,            /* inode number to get data for */
1133         void            __user *buffer, /* not used */
1134         int             ubsize,         /* not used */
1135         int             *ubused,        /* not used */
1136         int             *res)           /* result code value */
1137 {
1138         xfs_inode_t     *ip;
1139         xfs_qcnt_t      nblks;
1140         xfs_filblks_t   rtblks = 0;     /* total rt blks */
1141         int             error;
1142
1143         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1144
1145         /*
1146          * rootino must have its resources accounted for, not so with the quota
1147          * inodes.
1148          */
1149         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1150                 *res = BULKSTAT_RV_NOTHING;
1151                 return -EINVAL;
1152         }
1153
1154         /*
1155          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1156          * interface expects the inode to be exclusively locked because that's
1157          * the case in all other instances. It's OK that we do this because
1158          * quotacheck is done only at mount time.
1159          */
1160         error = xfs_iget(mp, NULL, ino, XFS_IGET_DONTCACHE, XFS_ILOCK_EXCL,
1161                          &ip);
1162         if (error) {
1163                 *res = BULKSTAT_RV_NOTHING;
1164                 return error;
1165         }
1166
1167         ASSERT(ip->i_delayed_blks == 0);
1168
1169         if (XFS_IS_REALTIME_INODE(ip)) {
1170                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1171
1172                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1173                         error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1174                         if (error)
1175                                 goto error0;
1176                 }
1177
1178                 xfs_bmap_count_leaves(ifp, &rtblks);
1179         }
1180
1181         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1182
1183         /*
1184          * Add the (disk blocks and inode) resources occupied by this
1185          * inode to its dquots. We do this adjustment in the incore dquot,
1186          * and also copy the changes to its buffer.
1187          * We don't care about putting these changes in a transaction
1188          * envelope because if we crash in the middle of a 'quotacheck'
1189          * we have to start from the beginning anyway.
1190          * Once we're done, we'll log all the dquot bufs.
1191          *
1192          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1193          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1194          */
1195         if (XFS_IS_UQUOTA_ON(mp)) {
1196                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1197                                                    XFS_DQ_USER, nblks, rtblks);
1198                 if (error)
1199                         goto error0;
1200         }
1201
1202         if (XFS_IS_GQUOTA_ON(mp)) {
1203                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1204                                                    XFS_DQ_GROUP, nblks, rtblks);
1205                 if (error)
1206                         goto error0;
1207         }
1208
1209         if (XFS_IS_PQUOTA_ON(mp)) {
1210                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1211                                                    XFS_DQ_PROJ, nblks, rtblks);
1212                 if (error)
1213                         goto error0;
1214         }
1215
1216         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1217         IRELE(ip);
1218         *res = BULKSTAT_RV_DIDONE;
1219         return 0;
1220
1221 error0:
1222         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1223         IRELE(ip);
1224         *res = BULKSTAT_RV_GIVEUP;
1225         return error;
1226 }
1227
1228 STATIC int
1229 xfs_qm_flush_one(
1230         struct xfs_dquot        *dqp,
1231         void                    *data)
1232 {
1233         struct xfs_mount        *mp = dqp->q_mount;
1234         struct list_head        *buffer_list = data;
1235         struct xfs_buf          *bp = NULL;
1236         int                     error = 0;
1237
1238         xfs_dqlock(dqp);
1239         if (dqp->dq_flags & XFS_DQ_FREEING)
1240                 goto out_unlock;
1241         if (!XFS_DQ_IS_DIRTY(dqp))
1242                 goto out_unlock;
1243
1244         /*
1245          * The only way the dquot is already flush locked by the time quotacheck
1246          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1247          * it for the final time. Quotacheck collects all dquot bufs in the
1248          * local delwri queue before dquots are dirtied, so reclaim can't have
1249          * possibly queued it for I/O. The only way out is to push the buffer to
1250          * cycle the flush lock.
1251          */
1252         if (!xfs_dqflock_nowait(dqp)) {
1253                 /* buf is pinned in-core by delwri list */
1254                 DEFINE_SINGLE_BUF_MAP(map, dqp->q_blkno,
1255                                       mp->m_quotainfo->qi_dqchunklen);
1256                 bp = _xfs_buf_find(mp->m_ddev_targp, &map, 1, 0, NULL);
1257                 if (!bp) {
1258                         error = -EINVAL;
1259                         goto out_unlock;
1260                 }
1261                 xfs_buf_unlock(bp);
1262
1263                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1264                 xfs_buf_rele(bp);
1265
1266                 error = -EAGAIN;
1267                 goto out_unlock;
1268         }
1269
1270         error = xfs_qm_dqflush(dqp, &bp);
1271         if (error)
1272                 goto out_unlock;
1273
1274         xfs_buf_delwri_queue(bp, buffer_list);
1275         xfs_buf_relse(bp);
1276 out_unlock:
1277         xfs_dqunlock(dqp);
1278         return error;
1279 }
1280
1281 /*
1282  * Walk thru all the filesystem inodes and construct a consistent view
1283  * of the disk quota world. If the quotacheck fails, disable quotas.
1284  */
1285 STATIC int
1286 xfs_qm_quotacheck(
1287         xfs_mount_t     *mp)
1288 {
1289         int                     done, count, error, error2;
1290         xfs_ino_t               lastino;
1291         size_t                  structsz;
1292         uint                    flags;
1293         LIST_HEAD               (buffer_list);
1294         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1295         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1296         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1297
1298         count = INT_MAX;
1299         structsz = 1;
1300         lastino = 0;
1301         flags = 0;
1302
1303         ASSERT(uip || gip || pip);
1304         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1305
1306         xfs_notice(mp, "Quotacheck needed: Please wait.");
1307
1308         /*
1309          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1310          * their counters to zero. We need a clean slate.
1311          * We don't log our changes till later.
1312          */
1313         if (uip) {
1314                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1315                                          &buffer_list);
1316                 if (error)
1317                         goto error_return;
1318                 flags |= XFS_UQUOTA_CHKD;
1319         }
1320
1321         if (gip) {
1322                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1323                                          &buffer_list);
1324                 if (error)
1325                         goto error_return;
1326                 flags |= XFS_GQUOTA_CHKD;
1327         }
1328
1329         if (pip) {
1330                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1331                                          &buffer_list);
1332                 if (error)
1333                         goto error_return;
1334                 flags |= XFS_PQUOTA_CHKD;
1335         }
1336
1337         do {
1338                 /*
1339                  * Iterate thru all the inodes in the file system,
1340                  * adjusting the corresponding dquot counters in core.
1341                  */
1342                 error = xfs_bulkstat(mp, &lastino, &count,
1343                                      xfs_qm_dqusage_adjust,
1344                                      structsz, NULL, &done);
1345                 if (error)
1346                         break;
1347
1348         } while (!done);
1349
1350         /*
1351          * We've made all the changes that we need to make incore.  Flush them
1352          * down to disk buffers if everything was updated successfully.
1353          */
1354         if (XFS_IS_UQUOTA_ON(mp)) {
1355                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1356                                           &buffer_list);
1357         }
1358         if (XFS_IS_GQUOTA_ON(mp)) {
1359                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1360                                            &buffer_list);
1361                 if (!error)
1362                         error = error2;
1363         }
1364         if (XFS_IS_PQUOTA_ON(mp)) {
1365                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1366                                            &buffer_list);
1367                 if (!error)
1368                         error = error2;
1369         }
1370
1371         error2 = xfs_buf_delwri_submit(&buffer_list);
1372         if (!error)
1373                 error = error2;
1374
1375         /*
1376          * We can get this error if we couldn't do a dquot allocation inside
1377          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1378          * dirty dquots that might be cached, we just want to get rid of them
1379          * and turn quotaoff. The dquots won't be attached to any of the inodes
1380          * at this point (because we intentionally didn't in dqget_noattach).
1381          */
1382         if (error) {
1383                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1384                 goto error_return;
1385         }
1386
1387         /*
1388          * If one type of quotas is off, then it will lose its
1389          * quotachecked status, since we won't be doing accounting for
1390          * that type anymore.
1391          */
1392         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1393         mp->m_qflags |= flags;
1394
1395  error_return:
1396         xfs_buf_delwri_cancel(&buffer_list);
1397
1398         if (error) {
1399                 xfs_warn(mp,
1400         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1401                         error);
1402                 /*
1403                  * We must turn off quotas.
1404                  */
1405                 ASSERT(mp->m_quotainfo != NULL);
1406                 xfs_qm_destroy_quotainfo(mp);
1407                 if (xfs_mount_reset_sbqflags(mp)) {
1408                         xfs_warn(mp,
1409                                 "Quotacheck: Failed to reset quota flags.");
1410                 }
1411         } else
1412                 xfs_notice(mp, "Quotacheck: Done.");
1413         return error;
1414 }
1415
1416 /*
1417  * This is called from xfs_mountfs to start quotas and initialize all
1418  * necessary data structures like quotainfo.  This is also responsible for
1419  * running a quotacheck as necessary.  We are guaranteed that the superblock
1420  * is consistently read in at this point.
1421  *
1422  * If we fail here, the mount will continue with quota turned off. We don't
1423  * need to inidicate success or failure at all.
1424  */
1425 void
1426 xfs_qm_mount_quotas(
1427         struct xfs_mount        *mp)
1428 {
1429         int                     error = 0;
1430         uint                    sbf;
1431
1432         /*
1433          * If quotas on realtime volumes is not supported, we disable
1434          * quotas immediately.
1435          */
1436         if (mp->m_sb.sb_rextents) {
1437                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1438                 mp->m_qflags = 0;
1439                 goto write_changes;
1440         }
1441
1442         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1443
1444         /*
1445          * Allocate the quotainfo structure inside the mount struct, and
1446          * create quotainode(s), and change/rev superblock if necessary.
1447          */
1448         error = xfs_qm_init_quotainfo(mp);
1449         if (error) {
1450                 /*
1451                  * We must turn off quotas.
1452                  */
1453                 ASSERT(mp->m_quotainfo == NULL);
1454                 mp->m_qflags = 0;
1455                 goto write_changes;
1456         }
1457         /*
1458          * If any of the quotas are not consistent, do a quotacheck.
1459          */
1460         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1461                 error = xfs_qm_quotacheck(mp);
1462                 if (error) {
1463                         /* Quotacheck failed and disabled quotas. */
1464                         return;
1465                 }
1466         }
1467         /*
1468          * If one type of quotas is off, then it will lose its
1469          * quotachecked status, since we won't be doing accounting for
1470          * that type anymore.
1471          */
1472         if (!XFS_IS_UQUOTA_ON(mp))
1473                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1474         if (!XFS_IS_GQUOTA_ON(mp))
1475                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1476         if (!XFS_IS_PQUOTA_ON(mp))
1477                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1478
1479  write_changes:
1480         /*
1481          * We actually don't have to acquire the m_sb_lock at all.
1482          * This can only be called from mount, and that's single threaded. XXX
1483          */
1484         spin_lock(&mp->m_sb_lock);
1485         sbf = mp->m_sb.sb_qflags;
1486         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1487         spin_unlock(&mp->m_sb_lock);
1488
1489         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1490                 if (xfs_sync_sb(mp, false)) {
1491                         /*
1492                          * We could only have been turning quotas off.
1493                          * We aren't in very good shape actually because
1494                          * the incore structures are convinced that quotas are
1495                          * off, but the on disk superblock doesn't know that !
1496                          */
1497                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1498                         xfs_alert(mp, "%s: Superblock update failed!",
1499                                 __func__);
1500                 }
1501         }
1502
1503         if (error) {
1504                 xfs_warn(mp, "Failed to initialize disk quotas.");
1505                 return;
1506         }
1507 }
1508
1509 /*
1510  * This is called after the superblock has been read in and we're ready to
1511  * iget the quota inodes.
1512  */
1513 STATIC int
1514 xfs_qm_init_quotainos(
1515         xfs_mount_t     *mp)
1516 {
1517         struct xfs_inode        *uip = NULL;
1518         struct xfs_inode        *gip = NULL;
1519         struct xfs_inode        *pip = NULL;
1520         int                     error;
1521         uint                    flags = 0;
1522
1523         ASSERT(mp->m_quotainfo);
1524
1525         /*
1526          * Get the uquota and gquota inodes
1527          */
1528         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1529                 if (XFS_IS_UQUOTA_ON(mp) &&
1530                     mp->m_sb.sb_uquotino != NULLFSINO) {
1531                         ASSERT(mp->m_sb.sb_uquotino > 0);
1532                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1533                                              0, 0, &uip);
1534                         if (error)
1535                                 return error;
1536                 }
1537                 if (XFS_IS_GQUOTA_ON(mp) &&
1538                     mp->m_sb.sb_gquotino != NULLFSINO) {
1539                         ASSERT(mp->m_sb.sb_gquotino > 0);
1540                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1541                                              0, 0, &gip);
1542                         if (error)
1543                                 goto error_rele;
1544                 }
1545                 if (XFS_IS_PQUOTA_ON(mp) &&
1546                     mp->m_sb.sb_pquotino != NULLFSINO) {
1547                         ASSERT(mp->m_sb.sb_pquotino > 0);
1548                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1549                                              0, 0, &pip);
1550                         if (error)
1551                                 goto error_rele;
1552                 }
1553         } else {
1554                 flags |= XFS_QMOPT_SBVERSION;
1555         }
1556
1557         /*
1558          * Create the three inodes, if they don't exist already. The changes
1559          * made above will get added to a transaction and logged in one of
1560          * the qino_alloc calls below.  If the device is readonly,
1561          * temporarily switch to read-write to do this.
1562          */
1563         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1564                 error = xfs_qm_qino_alloc(mp, &uip,
1565                                               flags | XFS_QMOPT_UQUOTA);
1566                 if (error)
1567                         goto error_rele;
1568
1569                 flags &= ~XFS_QMOPT_SBVERSION;
1570         }
1571         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1572                 error = xfs_qm_qino_alloc(mp, &gip,
1573                                           flags | XFS_QMOPT_GQUOTA);
1574                 if (error)
1575                         goto error_rele;
1576
1577                 flags &= ~XFS_QMOPT_SBVERSION;
1578         }
1579         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1580                 error = xfs_qm_qino_alloc(mp, &pip,
1581                                           flags | XFS_QMOPT_PQUOTA);
1582                 if (error)
1583                         goto error_rele;
1584         }
1585
1586         mp->m_quotainfo->qi_uquotaip = uip;
1587         mp->m_quotainfo->qi_gquotaip = gip;
1588         mp->m_quotainfo->qi_pquotaip = pip;
1589
1590         return 0;
1591
1592 error_rele:
1593         if (uip)
1594                 IRELE(uip);
1595         if (gip)
1596                 IRELE(gip);
1597         if (pip)
1598                 IRELE(pip);
1599         return error;
1600 }
1601
1602 STATIC void
1603 xfs_qm_dqfree_one(
1604         struct xfs_dquot        *dqp)
1605 {
1606         struct xfs_mount        *mp = dqp->q_mount;
1607         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1608
1609         mutex_lock(&qi->qi_tree_lock);
1610         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1611                           be32_to_cpu(dqp->q_core.d_id));
1612
1613         qi->qi_dquots--;
1614         mutex_unlock(&qi->qi_tree_lock);
1615
1616         xfs_qm_dqdestroy(dqp);
1617 }
1618
1619 /* --------------- utility functions for vnodeops ---------------- */
1620
1621
1622 /*
1623  * Given an inode, a uid, gid and prid make sure that we have
1624  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1625  * quotas by creating this file.
1626  * This also attaches dquot(s) to the given inode after locking it,
1627  * and returns the dquots corresponding to the uid and/or gid.
1628  *
1629  * in   : inode (unlocked)
1630  * out  : udquot, gdquot with references taken and unlocked
1631  */
1632 int
1633 xfs_qm_vop_dqalloc(
1634         struct xfs_inode        *ip,
1635         xfs_dqid_t              uid,
1636         xfs_dqid_t              gid,
1637         prid_t                  prid,
1638         uint                    flags,
1639         struct xfs_dquot        **O_udqpp,
1640         struct xfs_dquot        **O_gdqpp,
1641         struct xfs_dquot        **O_pdqpp)
1642 {
1643         struct xfs_mount        *mp = ip->i_mount;
1644         struct xfs_dquot        *uq = NULL;
1645         struct xfs_dquot        *gq = NULL;
1646         struct xfs_dquot        *pq = NULL;
1647         int                     error;
1648         uint                    lockflags;
1649
1650         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1651                 return 0;
1652
1653         lockflags = XFS_ILOCK_EXCL;
1654         xfs_ilock(ip, lockflags);
1655
1656         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1657                 gid = ip->i_d.di_gid;
1658
1659         /*
1660          * Attach the dquot(s) to this inode, doing a dquot allocation
1661          * if necessary. The dquot(s) will not be locked.
1662          */
1663         if (XFS_NOT_DQATTACHED(mp, ip)) {
1664                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1665                 if (error) {
1666                         xfs_iunlock(ip, lockflags);
1667                         return error;
1668                 }
1669         }
1670
1671         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1672                 if (ip->i_d.di_uid != uid) {
1673                         /*
1674                          * What we need is the dquot that has this uid, and
1675                          * if we send the inode to dqget, the uid of the inode
1676                          * takes priority over what's sent in the uid argument.
1677                          * We must unlock inode here before calling dqget if
1678                          * we're not sending the inode, because otherwise
1679                          * we'll deadlock by doing trans_reserve while
1680                          * holding ilock.
1681                          */
1682                         xfs_iunlock(ip, lockflags);
1683                         error = xfs_qm_dqget(mp, NULL, uid,
1684                                                  XFS_DQ_USER,
1685                                                  XFS_QMOPT_DQALLOC |
1686                                                  XFS_QMOPT_DOWARN,
1687                                                  &uq);
1688                         if (error) {
1689                                 ASSERT(error != -ENOENT);
1690                                 return error;
1691                         }
1692                         /*
1693                          * Get the ilock in the right order.
1694                          */
1695                         xfs_dqunlock(uq);
1696                         lockflags = XFS_ILOCK_SHARED;
1697                         xfs_ilock(ip, lockflags);
1698                 } else {
1699                         /*
1700                          * Take an extra reference, because we'll return
1701                          * this to caller
1702                          */
1703                         ASSERT(ip->i_udquot);
1704                         uq = xfs_qm_dqhold(ip->i_udquot);
1705                 }
1706         }
1707         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1708                 if (ip->i_d.di_gid != gid) {
1709                         xfs_iunlock(ip, lockflags);
1710                         error = xfs_qm_dqget(mp, NULL, gid,
1711                                                  XFS_DQ_GROUP,
1712                                                  XFS_QMOPT_DQALLOC |
1713                                                  XFS_QMOPT_DOWARN,
1714                                                  &gq);
1715                         if (error) {
1716                                 ASSERT(error != -ENOENT);
1717                                 goto error_rele;
1718                         }
1719                         xfs_dqunlock(gq);
1720                         lockflags = XFS_ILOCK_SHARED;
1721                         xfs_ilock(ip, lockflags);
1722                 } else {
1723                         ASSERT(ip->i_gdquot);
1724                         gq = xfs_qm_dqhold(ip->i_gdquot);
1725                 }
1726         }
1727         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1728                 if (xfs_get_projid(ip) != prid) {
1729                         xfs_iunlock(ip, lockflags);
1730                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1731                                                  XFS_DQ_PROJ,
1732                                                  XFS_QMOPT_DQALLOC |
1733                                                  XFS_QMOPT_DOWARN,
1734                                                  &pq);
1735                         if (error) {
1736                                 ASSERT(error != -ENOENT);
1737                                 goto error_rele;
1738                         }
1739                         xfs_dqunlock(pq);
1740                         lockflags = XFS_ILOCK_SHARED;
1741                         xfs_ilock(ip, lockflags);
1742                 } else {
1743                         ASSERT(ip->i_pdquot);
1744                         pq = xfs_qm_dqhold(ip->i_pdquot);
1745                 }
1746         }
1747         if (uq)
1748                 trace_xfs_dquot_dqalloc(ip);
1749
1750         xfs_iunlock(ip, lockflags);
1751         if (O_udqpp)
1752                 *O_udqpp = uq;
1753         else
1754                 xfs_qm_dqrele(uq);
1755         if (O_gdqpp)
1756                 *O_gdqpp = gq;
1757         else
1758                 xfs_qm_dqrele(gq);
1759         if (O_pdqpp)
1760                 *O_pdqpp = pq;
1761         else
1762                 xfs_qm_dqrele(pq);
1763         return 0;
1764
1765 error_rele:
1766         xfs_qm_dqrele(gq);
1767         xfs_qm_dqrele(uq);
1768         return error;
1769 }
1770
1771 /*
1772  * Actually transfer ownership, and do dquot modifications.
1773  * These were already reserved.
1774  */
1775 xfs_dquot_t *
1776 xfs_qm_vop_chown(
1777         xfs_trans_t     *tp,
1778         xfs_inode_t     *ip,
1779         xfs_dquot_t     **IO_olddq,
1780         xfs_dquot_t     *newdq)
1781 {
1782         xfs_dquot_t     *prevdq;
1783         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1784                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1785
1786
1787         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1788         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1789
1790         /* old dquot */
1791         prevdq = *IO_olddq;
1792         ASSERT(prevdq);
1793         ASSERT(prevdq != newdq);
1794
1795         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1796         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1797
1798         /* the sparkling new dquot */
1799         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1800         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1801
1802         /*
1803          * Take an extra reference, because the inode is going to keep
1804          * this dquot pointer even after the trans_commit.
1805          */
1806         *IO_olddq = xfs_qm_dqhold(newdq);
1807
1808         return prevdq;
1809 }
1810
1811 /*
1812  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1813  */
1814 int
1815 xfs_qm_vop_chown_reserve(
1816         struct xfs_trans        *tp,
1817         struct xfs_inode        *ip,
1818         struct xfs_dquot        *udqp,
1819         struct xfs_dquot        *gdqp,
1820         struct xfs_dquot        *pdqp,
1821         uint                    flags)
1822 {
1823         struct xfs_mount        *mp = ip->i_mount;
1824         uint                    delblks, blkflags, prjflags = 0;
1825         struct xfs_dquot        *udq_unres = NULL;
1826         struct xfs_dquot        *gdq_unres = NULL;
1827         struct xfs_dquot        *pdq_unres = NULL;
1828         struct xfs_dquot        *udq_delblks = NULL;
1829         struct xfs_dquot        *gdq_delblks = NULL;
1830         struct xfs_dquot        *pdq_delblks = NULL;
1831         int                     error;
1832
1833
1834         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1835         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1836
1837         delblks = ip->i_delayed_blks;
1838         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1839                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1840
1841         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1842             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1843                 udq_delblks = udqp;
1844                 /*
1845                  * If there are delayed allocation blocks, then we have to
1846                  * unreserve those from the old dquot, and add them to the
1847                  * new dquot.
1848                  */
1849                 if (delblks) {
1850                         ASSERT(ip->i_udquot);
1851                         udq_unres = ip->i_udquot;
1852                 }
1853         }
1854         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1855             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1856                 gdq_delblks = gdqp;
1857                 if (delblks) {
1858                         ASSERT(ip->i_gdquot);
1859                         gdq_unres = ip->i_gdquot;
1860                 }
1861         }
1862
1863         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1864             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1865                 prjflags = XFS_QMOPT_ENOSPC;
1866                 pdq_delblks = pdqp;
1867                 if (delblks) {
1868                         ASSERT(ip->i_pdquot);
1869                         pdq_unres = ip->i_pdquot;
1870                 }
1871         }
1872
1873         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1874                                 udq_delblks, gdq_delblks, pdq_delblks,
1875                                 ip->i_d.di_nblocks, 1,
1876                                 flags | blkflags | prjflags);
1877         if (error)
1878                 return error;
1879
1880         /*
1881          * Do the delayed blks reservations/unreservations now. Since, these
1882          * are done without the help of a transaction, if a reservation fails
1883          * its previous reservations won't be automatically undone by trans
1884          * code. So, we have to do it manually here.
1885          */
1886         if (delblks) {
1887                 /*
1888                  * Do the reservations first. Unreservation can't fail.
1889                  */
1890                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1891                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1892                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1893                             udq_delblks, gdq_delblks, pdq_delblks,
1894                             (xfs_qcnt_t)delblks, 0,
1895                             flags | blkflags | prjflags);
1896                 if (error)
1897                         return error;
1898                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1899                                 udq_unres, gdq_unres, pdq_unres,
1900                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1901         }
1902
1903         return 0;
1904 }
1905
1906 int
1907 xfs_qm_vop_rename_dqattach(
1908         struct xfs_inode        **i_tab)
1909 {
1910         struct xfs_mount        *mp = i_tab[0]->i_mount;
1911         int                     i;
1912
1913         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1914                 return 0;
1915
1916         for (i = 0; (i < 4 && i_tab[i]); i++) {
1917                 struct xfs_inode        *ip = i_tab[i];
1918                 int                     error;
1919
1920                 /*
1921                  * Watch out for duplicate entries in the table.
1922                  */
1923                 if (i == 0 || ip != i_tab[i-1]) {
1924                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1925                                 error = xfs_qm_dqattach(ip, 0);
1926                                 if (error)
1927                                         return error;
1928                         }
1929                 }
1930         }
1931         return 0;
1932 }
1933
1934 void
1935 xfs_qm_vop_create_dqattach(
1936         struct xfs_trans        *tp,
1937         struct xfs_inode        *ip,
1938         struct xfs_dquot        *udqp,
1939         struct xfs_dquot        *gdqp,
1940         struct xfs_dquot        *pdqp)
1941 {
1942         struct xfs_mount        *mp = tp->t_mountp;
1943
1944         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1945                 return;
1946
1947         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1948         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1949
1950         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1951                 ASSERT(ip->i_udquot == NULL);
1952                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1953
1954                 ip->i_udquot = xfs_qm_dqhold(udqp);
1955                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1956         }
1957         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1958                 ASSERT(ip->i_gdquot == NULL);
1959                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1960                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1961                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1962         }
1963         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1964                 ASSERT(ip->i_pdquot == NULL);
1965                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1966
1967                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1968                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1969         }
1970 }
1971