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_trans.h"
  35 #include "xfs_trans_space.h"
  36 #include "xfs_qm.h"
  37 #include "xfs_trace.h"
  38 #include "xfs_icache.h"
  39 #include "xfs_cksum.h"
  40
  41 /*
  42  * The global quota manager. There is only one of these for the entire
  43  * system, _not_ one per file system. XQM keeps track of the overall
  44  * quota functionality, including maintaining the freelist and hash
  45  * tables of dquots.
  46  */
  47 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  48 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  49
  50
  51 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  52 /*
  53  * We use the batch lookup interface to iterate over the dquots as it
  54  * currently is the only interface into the radix tree code that allows
  55  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  56  * operations is fine as all callers are used either during mount/umount
  57  * or quotaoff.
  58  */
  59 #define XFS_DQ_LOOKUP_BATCH     32
  60
  61 STATIC int
  62 xfs_qm_dquot_walk(
  63         struct xfs_mount        *mp,
  64         int                     type,
  65         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  66         void                    *data)
  67 {
  68         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  69         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  70         uint32_t                next_index;
  71         int                     last_error = 0;
  72         int                     skipped;
  73         int                     nr_found;
  74
  75 restart:
  76         skipped = 0;
  77         next_index = 0;
  78         nr_found = 0;
  79
  80         while (1) {
  81                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  82                 int             error = 0;
  83                 int             i;
  84
  85                 mutex_lock(&qi->qi_tree_lock);
  86                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  87                                         next_index, XFS_DQ_LOOKUP_BATCH);
  88                 if (!nr_found) {
  89                         mutex_unlock(&qi->qi_tree_lock);
  90                         break;
  91                 }
  92
  93                 for (i = 0; i < nr_found; i++) {
  94                         struct xfs_dquot *dqp = batch[i];
  95
  96                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  97
  98                         error = execute(batch[i], data);
  99                         if (error == -EAGAIN) {
 100                                 skipped++;
 101                                 continue;
 102                         }
 103                         if (error && last_error != -EFSCORRUPTED)
 104                                 last_error = error;
 105                 }
 106
 107                 mutex_unlock(&qi->qi_tree_lock);
 108
 109                 /* bail out if the filesystem is corrupted.  */
 110                 if (last_error == -EFSCORRUPTED) {
 111                         skipped = 0;
 112                         break;
 113                 }
 114         }
 115
 116         if (skipped) {
 117                 delay(1);
 118                 goto restart;
 119         }
 120
 121         return last_error;
 122 }
 123
 124
 125 /*
 126  * Purge a dquot from all tracking data structures and free it.
 127  */
 128 STATIC int
 129 xfs_qm_dqpurge(
 130         struct xfs_dquot        *dqp,
 131         void                    *data)
 132 {
 133         struct xfs_mount        *mp = dqp->q_mount;
 134         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 135
 136         xfs_dqlock(dqp);
 137         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 138                 xfs_dqunlock(dqp);
 139                 return -EAGAIN;
 140         }
 141
 142         dqp->dq_flags |= XFS_DQ_FREEING;
 143
 144         xfs_dqflock(dqp);
 145
 146         /*
 147          * If we are turning this type of quotas off, we don't care
 148          * about the dirty metadata sitting in this dquot. OTOH, if
 149          * we're unmounting, we do care, so we flush it and wait.
 150          */
 151         if (XFS_DQ_IS_DIRTY(dqp)) {
 152                 struct xfs_buf  *bp = NULL;
 153                 int             error;
 154
 155                 /*
 156                  * We don't care about getting disk errors here. We need
 157                  * to purge this dquot anyway, so we go ahead regardless.
 158                  */
 159                 error = xfs_qm_dqflush(dqp, &bp);
 160                 if (error) {
 161                         xfs_warn(mp, "%s: dquot %p flush failed",
 162                                 __func__, dqp);
 163                 } else {
 164                         error = xfs_bwrite(bp);
 165                         xfs_buf_relse(bp);
 166                 }
 167                 xfs_dqflock(dqp);
 168         }
 169
 170         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 171         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 172                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 173
 174         xfs_dqfunlock(dqp);
 175         xfs_dqunlock(dqp);
 176
 177         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 178                           be32_to_cpu(dqp->q_core.d_id));
 179         qi->qi_dquots--;
 180
 181         /*
 182          * We move dquots to the freelist as soon as their reference count
 183          * hits zero, so it really should be on the freelist here.
 184          */
 185         ASSERT(!list_empty(&dqp->q_lru));
 186         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 187         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 188
 189         xfs_qm_dqdestroy(dqp);
 190         return 0;
 191 }
 192
 193 /*
 194  * Purge the dquot cache.
 195  */
 196 void
 197 xfs_qm_dqpurge_all(
 198         struct xfs_mount        *mp,
 199         uint                    flags)
 200 {
 201         if (flags & XFS_QMOPT_UQUOTA)
 202                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 203         if (flags & XFS_QMOPT_GQUOTA)
 204                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 205         if (flags & XFS_QMOPT_PQUOTA)
 206                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 207 }
 208
 209 /*
 210  * Just destroy the quotainfo structure.
 211  */
 212 void
 213 xfs_qm_unmount(
 214         struct xfs_mount        *mp)
 215 {
 216         if (mp->m_quotainfo) {
 217                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 218                 xfs_qm_destroy_quotainfo(mp);
 219         }
 220 }
 221
 222 /*
 223  * Called from the vfsops layer.
 224  */
 225 void
 226 xfs_qm_unmount_quotas(
 227         xfs_mount_t     *mp)
 228 {
 229         /*
 230          * Release the dquots that root inode, et al might be holding,
 231          * before we flush quotas and blow away the quotainfo structure.
 232          */
 233         ASSERT(mp->m_rootip);
 234         xfs_qm_dqdetach(mp->m_rootip);
 235         if (mp->m_rbmip)
 236                 xfs_qm_dqdetach(mp->m_rbmip);
 237         if (mp->m_rsumip)
 238                 xfs_qm_dqdetach(mp->m_rsumip);
 239
 240         /*
 241          * Release the quota inodes.
 242          */
 243         if (mp->m_quotainfo) {
 244                 if (mp->m_quotainfo->qi_uquotaip) {
 245                         IRELE(mp->m_quotainfo->qi_uquotaip);
 246                         mp->m_quotainfo->qi_uquotaip = NULL;
 247                 }
 248                 if (mp->m_quotainfo->qi_gquotaip) {
 249                         IRELE(mp->m_quotainfo->qi_gquotaip);
 250                         mp->m_quotainfo->qi_gquotaip = NULL;
 251                 }
 252                 if (mp->m_quotainfo->qi_pquotaip) {
 253                         IRELE(mp->m_quotainfo->qi_pquotaip);
 254                         mp->m_quotainfo->qi_pquotaip = NULL;
 255                 }
 256         }
 257 }
 258
 259 STATIC int
 260 xfs_qm_dqattach_one(
 261         xfs_inode_t     *ip,
 262         xfs_dqid_t      id,
 263         uint            type,
 264         uint            doalloc,
 265         xfs_dquot_t     **IO_idqpp)
 266 {
 267         xfs_dquot_t     *dqp;
 268         int             error;
 269
 270         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 271         error = 0;
 272
 273         /*
 274          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 275          * or &i_gdquot. This made the code look weird, but made the logic a lot
 276          * simpler.
 277          */
 278         dqp = *IO_idqpp;
 279         if (dqp) {
 280                 trace_xfs_dqattach_found(dqp);
 281                 return 0;
 282         }
 283
 284         /*
 285          * Find the dquot from somewhere. This bumps the reference count of
 286          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 287          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 288          * turned off suddenly.
 289          */
 290         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 291                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 292         if (error)
 293                 return error;
 294
 295         trace_xfs_dqattach_get(dqp);
 296
 297         /*
 298          * dqget may have dropped and re-acquired the ilock, but it guarantees
 299          * that the dquot returned is the one that should go in the inode.
 300          */
 301         *IO_idqpp = dqp;
 302         xfs_dqunlock(dqp);
 303         return 0;
 304 }
 305
 306 static bool
 307 xfs_qm_need_dqattach(
 308         struct xfs_inode        *ip)
 309 {
 310         struct xfs_mount        *mp = ip->i_mount;
 311
 312         if (!XFS_IS_QUOTA_RUNNING(mp))
 313                 return false;
 314         if (!XFS_IS_QUOTA_ON(mp))
 315                 return false;
 316         if (!XFS_NOT_DQATTACHED(mp, ip))
 317                 return false;
 318         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 319                 return false;
 320         return true;
 321 }
 322
 323 /*
 324  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 325  * into account.
 326  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 327  * Inode may get unlocked and relocked in here, and the caller must deal with
 328  * the consequences.
 329  */
 330 int
 331 xfs_qm_dqattach_locked(
 332         xfs_inode_t     *ip,
 333         uint            flags)
 334 {
 335         xfs_mount_t     *mp = ip->i_mount;
 336         int             error = 0;
 337
 338         if (!xfs_qm_need_dqattach(ip))
 339                 return 0;
 340
 341         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 342
 343         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 344                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 345                                                 flags & XFS_QMOPT_DQALLOC,
 346                                                 &ip->i_udquot);
 347                 if (error)
 348                         goto done;
 349                 ASSERT(ip->i_udquot);
 350         }
 351
 352         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 353                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 354                                                 flags & XFS_QMOPT_DQALLOC,
 355                                                 &ip->i_gdquot);
 356                 if (error)
 357                         goto done;
 358                 ASSERT(ip->i_gdquot);
 359         }
 360
 361         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 362                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 363                                                 flags & XFS_QMOPT_DQALLOC,
 364                                                 &ip->i_pdquot);
 365                 if (error)
 366                         goto done;
 367                 ASSERT(ip->i_pdquot);
 368         }
 369
 370 done:
 371         /*
 372          * Don't worry about the dquots that we may have attached before any
 373          * error - they'll get detached later if it has not already been done.
 374          */
 375         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 376         return error;
 377 }
 378
 379 int
 380 xfs_qm_dqattach(
 381         struct xfs_inode        *ip,
 382         uint                    flags)
 383 {
 384         int                     error;
 385
 386         if (!xfs_qm_need_dqattach(ip))
 387                 return 0;
 388
 389         xfs_ilock(ip, XFS_ILOCK_EXCL);
 390         error = xfs_qm_dqattach_locked(ip, flags);
 391         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 392
 393         return error;
 394 }
 395
 396 /*
 397  * Release dquots (and their references) if any.
 398  * The inode should be locked EXCL except when this's called by
 399  * xfs_ireclaim.
 400  */
 401 void
 402 xfs_qm_dqdetach(
 403         xfs_inode_t     *ip)
 404 {
 405         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 406                 return;
 407
 408         trace_xfs_dquot_dqdetach(ip);
 409
 410         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 411         if (ip->i_udquot) {
 412                 xfs_qm_dqrele(ip->i_udquot);
 413                 ip->i_udquot = NULL;
 414         }
 415         if (ip->i_gdquot) {
 416                 xfs_qm_dqrele(ip->i_gdquot);
 417                 ip->i_gdquot = NULL;
 418         }
 419         if (ip->i_pdquot) {
 420                 xfs_qm_dqrele(ip->i_pdquot);
 421                 ip->i_pdquot = NULL;
 422         }
 423 }
 424
 425 struct xfs_qm_isolate {
 426         struct list_head        buffers;
 427         struct list_head        dispose;
 428 };
 429
 430 static enum lru_status
 431 xfs_qm_dquot_isolate(
 432         struct list_head        *item,
 433         struct list_lru_one     *lru,
 434         spinlock_t              *lru_lock,
 435         void                    *arg)
 436                 __releases(lru_lock) __acquires(lru_lock)
 437 {
 438         struct xfs_dquot        *dqp = container_of(item,
 439                                                 struct xfs_dquot, q_lru);
 440         struct xfs_qm_isolate   *isol = arg;
 441
 442         if (!xfs_dqlock_nowait(dqp))
 443                 goto out_miss_busy;
 444
 445         /*
 446          * This dquot has acquired a reference in the meantime remove it from
 447          * the freelist and try again.
 448          */
 449         if (dqp->q_nrefs) {
 450                 xfs_dqunlock(dqp);
 451                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 452
 453                 trace_xfs_dqreclaim_want(dqp);
 454                 list_lru_isolate(lru, &dqp->q_lru);
 455                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 456                 return LRU_REMOVED;
 457         }
 458
 459         /*
 460          * If the dquot is dirty, flush it. If it's already being flushed, just
 461          * skip it so there is time for the IO to complete before we try to
 462          * reclaim it again on the next LRU pass.
 463          */
 464         if (!xfs_dqflock_nowait(dqp)) {
 465                 xfs_dqunlock(dqp);
 466                 goto out_miss_busy;
 467         }
 468
 469         if (XFS_DQ_IS_DIRTY(dqp)) {
 470                 struct xfs_buf  *bp = NULL;
 471                 int             error;
 472
 473                 trace_xfs_dqreclaim_dirty(dqp);
 474
 475                 /* we have to drop the LRU lock to flush the dquot */
 476                 spin_unlock(lru_lock);
 477
 478                 error = xfs_qm_dqflush(dqp, &bp);
 479                 if (error) {
 480                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 481                                  __func__, dqp);
 482                         goto out_unlock_dirty;
 483                 }
 484
 485                 xfs_buf_delwri_queue(bp, &isol->buffers);
 486                 xfs_buf_relse(bp);
 487                 goto out_unlock_dirty;
 488         }
 489         xfs_dqfunlock(dqp);
 490
 491         /*
 492          * Prevent lookups now that we are past the point of no return.
 493          */
 494         dqp->dq_flags |= XFS_DQ_FREEING;
 495         xfs_dqunlock(dqp);
 496
 497         ASSERT(dqp->q_nrefs == 0);
 498         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 499         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 500         trace_xfs_dqreclaim_done(dqp);
 501         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 502         return LRU_REMOVED;
 503
 504 out_miss_busy:
 505         trace_xfs_dqreclaim_busy(dqp);
 506         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 507         return LRU_SKIP;
 508
 509 out_unlock_dirty:
 510         trace_xfs_dqreclaim_busy(dqp);
 511         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 512         xfs_dqunlock(dqp);
 513         spin_lock(lru_lock);
 514         return LRU_RETRY;
 515 }
 516
 517 static unsigned long
 518 xfs_qm_shrink_scan(
 519         struct shrinker         *shrink,
 520         struct shrink_control   *sc)
 521 {
 522         struct xfs_quotainfo    *qi = container_of(shrink,
 523                                         struct xfs_quotainfo, qi_shrinker);
 524         struct xfs_qm_isolate   isol;
 525         unsigned long           freed;
 526         int                     error;
 527
 528         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 529                 return 0;
 530
 531         INIT_LIST_HEAD(&isol.buffers);
 532         INIT_LIST_HEAD(&isol.dispose);
 533
 534         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 535                                      xfs_qm_dquot_isolate, &isol);
 536
 537         error = xfs_buf_delwri_submit(&isol.buffers);
 538         if (error)
 539                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 540
 541         while (!list_empty(&isol.dispose)) {
 542                 struct xfs_dquot        *dqp;
 543
 544                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 545                 list_del_init(&dqp->q_lru);
 546                 xfs_qm_dqfree_one(dqp);
 547         }
 548
 549         return freed;
 550 }
 551
 552 static unsigned long
 553 xfs_qm_shrink_count(
 554         struct shrinker         *shrink,
 555         struct shrink_control   *sc)
 556 {
 557         struct xfs_quotainfo    *qi = container_of(shrink,
 558                                         struct xfs_quotainfo, qi_shrinker);
 559
 560         return list_lru_shrink_count(&qi->qi_lru, sc);
 561 }
 562
 563 STATIC void
 564 xfs_qm_set_defquota(
 565         xfs_mount_t     *mp,
 566         uint            type,
 567         xfs_quotainfo_t *qinf)
 568 {
 569         xfs_dquot_t             *dqp;
 570         struct xfs_def_quota    *defq;
 571         int                     error;
 572
 573         error = xfs_qm_dqread(mp, 0, type, XFS_QMOPT_DOWARN, &dqp);
 574
 575         if (!error) {
 576                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 577
 578                 defq = xfs_get_defquota(dqp, qinf);
 579
 580                 /*
 581                  * Timers and warnings have been already set, let's just set the
 582                  * default limits for this quota type
 583                  */
 584                 defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 585                 defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 586                 defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 587                 defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 588                 defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 589                 defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 590                 xfs_qm_dqdestroy(dqp);
 591         }
 592 }
 593
 594 /*
 595  * This initializes all the quota information that's kept in the
 596  * mount structure
 597  */
 598 STATIC int
 599 xfs_qm_init_quotainfo(
 600         xfs_mount_t     *mp)
 601 {
 602         xfs_quotainfo_t *qinf;
 603         int             error;
 604         xfs_dquot_t     *dqp;
 605
 606         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 607
 608         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 609
 610         error = list_lru_init(&qinf->qi_lru);
 611         if (error)
 612                 goto out_free_qinf;
 613
 614         /*
 615          * See if quotainodes are setup, and if not, allocate them,
 616          * and change the superblock accordingly.
 617          */
 618         error = xfs_qm_init_quotainos(mp);
 619         if (error)
 620                 goto out_free_lru;
 621
 622         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 623         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 624         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 625         mutex_init(&qinf->qi_tree_lock);
 626
 627         /* mutex used to serialize quotaoffs */
 628         mutex_init(&qinf->qi_quotaofflock);
 629
 630         /* Precalc some constants */
 631         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 632         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 633
 634         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 635
 636         /*
 637          * We try to get the limits from the superuser's limits fields.
 638          * This is quite hacky, but it is standard quota practice.
 639          *
 640          * Since we may not have done a quotacheck by this point, just read
 641          * the dquot without attaching it to any hashtables or lists.
 642          *
 643          * Timers and warnings are globally set by the first timer found in
 644          * user/group/proj quota types, otherwise a default value is used.
 645          * This should be split into different fields per quota type.
 646          */
 647         error = xfs_qm_dqread(mp, 0,
 648                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 649                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 650                           XFS_DQ_PROJ),
 651                         XFS_QMOPT_DOWARN, &dqp);
 652
 653         if (!error) {
 654                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 655
 656                 /*
 657                  * The warnings and timers set the grace period given to
 658                  * a user or group before he or she can not perform any
 659                  * more writing. If it is zero, a default is used.
 660                  */
 661                 qinf->qi_btimelimit = ddqp->d_btimer ?
 662                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 663                 qinf->qi_itimelimit = ddqp->d_itimer ?
 664                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 665                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 666                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 667                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 668                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 669                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 670                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 671                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 672                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 673                 xfs_qm_dqdestroy(dqp);
 674         } else {
 675                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 676                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 677                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 678                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 679                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 680                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 681         }
 682
 683         if (XFS_IS_UQUOTA_RUNNING(mp))
 684                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 685         if (XFS_IS_GQUOTA_RUNNING(mp))
 686                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 687         if (XFS_IS_PQUOTA_RUNNING(mp))
 688                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 689
 690         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 691         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 692         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 693         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 694         register_shrinker(&qinf->qi_shrinker);
 695         return 0;
 696
 697 out_free_lru:
 698         list_lru_destroy(&qinf->qi_lru);
 699 out_free_qinf:
 700         kmem_free(qinf);
 701         mp->m_quotainfo = NULL;
 702         return error;
 703 }
 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         xfs_mount_t     *mp)
 714 {
 715         xfs_quotainfo_t *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
 723         if (qi->qi_uquotaip) {
 724                 IRELE(qi->qi_uquotaip);
 725                 qi->qi_uquotaip = NULL; /* paranoia */
 726         }
 727         if (qi->qi_gquotaip) {
 728                 IRELE(qi->qi_gquotaip);
 729                 qi->qi_gquotaip = NULL;
 730         }
 731         if (qi->qi_pquotaip) {
 732                 IRELE(qi->qi_pquotaip);
 733                 qi->qi_pquotaip = NULL;
 734         }
 735         mutex_destroy(&qi->qi_quotaofflock);
 736         kmem_free(qi);
 737         mp->m_quotainfo = NULL;
 738 }
 739
 740 /*
 741  * Create an inode and return with a reference already taken, but unlocked
 742  * This is how we create quota inodes
 743  */
 744 STATIC int
 745 xfs_qm_qino_alloc(
 746         xfs_mount_t     *mp,
 747         xfs_inode_t     **ip,
 748         uint            flags)
 749 {
 750         xfs_trans_t     *tp;
 751         int             error;
 752         int             committed;
 753         bool            need_alloc = true;
 754
 755         *ip = NULL;
 756         /*
 757          * With superblock that doesn't have separate pquotino, we
 758          * share an inode between gquota and pquota. If the on-disk
 759          * superblock has GQUOTA and the filesystem is now mounted
 760          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 761          * vice-versa.
 762          */
 763         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 764                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 765                 xfs_ino_t ino = NULLFSINO;
 766
 767                 if ((flags & XFS_QMOPT_PQUOTA) &&
 768                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 769                         ino = mp->m_sb.sb_gquotino;
 770                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 771                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 772                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 773                         ino = mp->m_sb.sb_pquotino;
 774                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 775                 }
 776                 if (ino != NULLFSINO) {
 777                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 778                         if (error)
 779                                 return error;
 780                         mp->m_sb.sb_gquotino = NULLFSINO;
 781                         mp->m_sb.sb_pquotino = NULLFSINO;
 782                         need_alloc = false;
 783                 }
 784         }
 785
 786         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 787         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 788                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 789         if (error) {
 790                 xfs_trans_cancel(tp);
 791                 return error;
 792         }
 793
 794         if (need_alloc) {
 795                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 796                                                                 &committed);
 797                 if (error) {
 798                         xfs_trans_cancel(tp);
 799                         return error;
 800                 }
 801         }
 802
 803         /*
 804          * Make the changes in the superblock, and log those too.
 805          * sbfields arg may contain fields other than *QUOTINO;
 806          * VERSIONNUM for example.
 807          */
 808         spin_lock(&mp->m_sb_lock);
 809         if (flags & XFS_QMOPT_SBVERSION) {
 810                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 811
 812                 xfs_sb_version_addquota(&mp->m_sb);
 813                 mp->m_sb.sb_uquotino = NULLFSINO;
 814                 mp->m_sb.sb_gquotino = NULLFSINO;
 815                 mp->m_sb.sb_pquotino = NULLFSINO;
 816
 817                 /* qflags will get updated fully _after_ quotacheck */
 818                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 819         }
 820         if (flags & XFS_QMOPT_UQUOTA)
 821                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 822         else if (flags & XFS_QMOPT_GQUOTA)
 823                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 824         else
 825                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 826         spin_unlock(&mp->m_sb_lock);
 827         xfs_log_sb(tp);
 828
 829         error = xfs_trans_commit(tp);
 830         if (error) {
 831                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 832                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 833         }
 834         if (need_alloc)
 835                 xfs_finish_inode_setup(*ip);
 836         return error;
 837 }
 838
 839
 840 STATIC void
 841 xfs_qm_reset_dqcounts(
 842         xfs_mount_t     *mp,
 843         xfs_buf_t       *bp,
 844         xfs_dqid_t      id,
 845         uint            type)
 846 {
 847         struct xfs_dqblk        *dqb;
 848         int                     j;
 849
 850         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 851
 852         /*
 853          * Reset all counters and timers. They'll be
 854          * started afresh by xfs_qm_quotacheck.
 855          */
 856 #ifdef DEBUG
 857         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 858         do_div(j, sizeof(xfs_dqblk_t));
 859         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 860 #endif
 861         dqb = bp->b_addr;
 862         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 863                 struct xfs_disk_dquot   *ddq;
 864
 865                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 866
 867                 /*
 868                  * Do a sanity check, and if needed, repair the dqblk. Don't
 869                  * output any warnings because it's perfectly possible to
 870                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 871                  */
 872                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 873                             "xfs_quotacheck");
 874                 /*
 875                  * Reset type in case we are reusing group quota file for
 876                  * project quotas or vice versa
 877                  */
 878                 ddq->d_flags = type;
 879                 ddq->d_bcount = 0;
 880                 ddq->d_icount = 0;
 881                 ddq->d_rtbcount = 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                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 890                         xfs_update_cksum((char *)&dqb[j],
 891                                          sizeof(struct xfs_dqblk),
 892                                          XFS_DQUOT_CRC_OFF);
 893                 }
 894         }
 895 }
 896
 897 STATIC int
 898 xfs_qm_dqiter_bufs(
 899         struct xfs_mount        *mp,
 900         xfs_dqid_t              firstid,
 901         xfs_fsblock_t           bno,
 902         xfs_filblks_t           blkcnt,
 903         uint                    flags,
 904         struct list_head        *buffer_list)
 905 {
 906         struct xfs_buf          *bp;
 907         int                     error;
 908         int                     type;
 909
 910         ASSERT(blkcnt > 0);
 911         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 912                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 913         error = 0;
 914
 915         /*
 916          * Blkcnt arg can be a very big number, and might even be
 917          * larger than the log itself. So, we have to break it up into
 918          * manageable-sized transactions.
 919          * Note that we don't start a permanent transaction here; we might
 920          * not be able to get a log reservation for the whole thing up front,
 921          * and we don't really care to either, because we just discard
 922          * everything if we were to crash in the middle of this loop.
 923          */
 924         while (blkcnt--) {
 925                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 926                               XFS_FSB_TO_DADDR(mp, bno),
 927                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 928                               &xfs_dquot_buf_ops);
 929
 930                 /*
 931                  * CRC and validation errors will return a EFSCORRUPTED here. If
 932                  * this occurs, re-read without CRC validation so that we can
 933                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 934                  * will leave a trace in the log indicating corruption has
 935                  * been detected.
 936                  */
 937                 if (error == -EFSCORRUPTED) {
 938                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 939                                       XFS_FSB_TO_DADDR(mp, bno),
 940                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 941                                       NULL);
 942                 }
 943
 944                 if (error)
 945                         break;
 946
 947                 /*
 948                  * A corrupt buffer might not have a verifier attached, so
 949                  * make sure we have the correct one attached before writeback
 950                  * occurs.
 951                  */
 952                 bp->b_ops = &xfs_dquot_buf_ops;
 953                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 954                 xfs_buf_delwri_queue(bp, buffer_list);
 955                 xfs_buf_relse(bp);
 956
 957                 /* goto the next block. */
 958                 bno++;
 959                 firstid += mp->m_quotainfo->qi_dqperchunk;
 960         }
 961
 962         return error;
 963 }
 964
 965 /*
 966  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 967  * caller supplied function for every chunk of dquots that we find.
 968  */
 969 STATIC int
 970 xfs_qm_dqiterate(
 971         struct xfs_mount        *mp,
 972         struct xfs_inode        *qip,
 973         uint                    flags,
 974         struct list_head        *buffer_list)
 975 {
 976         struct xfs_bmbt_irec    *map;
 977         int                     i, nmaps;       /* number of map entries */
 978         int                     error;          /* return value */
 979         xfs_fileoff_t           lblkno;
 980         xfs_filblks_t           maxlblkcnt;
 981         xfs_dqid_t              firstid;
 982         xfs_fsblock_t           rablkno;
 983         xfs_filblks_t           rablkcnt;
 984
 985         error = 0;
 986         /*
 987          * This looks racy, but we can't keep an inode lock across a
 988          * trans_reserve. But, this gets called during quotacheck, and that
 989          * happens only at mount time which is single threaded.
 990          */
 991         if (qip->i_d.di_nblocks == 0)
 992                 return 0;
 993
 994         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 995
 996         lblkno = 0;
 997         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 998         do {
 999                 uint            lock_mode;
1000
1001                 nmaps = XFS_DQITER_MAP_SIZE;
1002                 /*
1003                  * We aren't changing the inode itself. Just changing
1004                  * some of its data. No new blocks are added here, and
1005                  * the inode is never added to the transaction.
1006                  */
1007                 lock_mode = xfs_ilock_data_map_shared(qip);
1008                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1009                                        map, &nmaps, 0);
1010                 xfs_iunlock(qip, lock_mode);
1011                 if (error)
1012                         break;
1013
1014                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1015                 for (i = 0; i < nmaps; i++) {
1016                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1017                         ASSERT(map[i].br_blockcount);
1018
1019
1020                         lblkno += map[i].br_blockcount;
1021
1022                         if (map[i].br_startblock == HOLESTARTBLOCK)
1023                                 continue;
1024
1025                         firstid = (xfs_dqid_t) map[i].br_startoff *
1026                                 mp->m_quotainfo->qi_dqperchunk;
1027                         /*
1028                          * Do a read-ahead on the next extent.
1029                          */
1030                         if ((i+1 < nmaps) &&
1031                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1032                                 rablkcnt =  map[i+1].br_blockcount;
1033                                 rablkno = map[i+1].br_startblock;
1034                                 while (rablkcnt--) {
1035                                         xfs_buf_readahead(mp->m_ddev_targp,
1036                                                XFS_FSB_TO_DADDR(mp, rablkno),
1037                                                mp->m_quotainfo->qi_dqchunklen,
1038                                                &xfs_dquot_buf_ops);
1039                                         rablkno++;
1040                                 }
1041                         }
1042                         /*
1043                          * Iterate thru all the blks in the extent and
1044                          * reset the counters of all the dquots inside them.
1045                          */
1046                         error = xfs_qm_dqiter_bufs(mp, firstid,
1047                                                    map[i].br_startblock,
1048                                                    map[i].br_blockcount,
1049                                                    flags, buffer_list);
1050                         if (error)
1051                                 goto out;
1052                 }
1053         } while (nmaps > 0);
1054
1055 out:
1056         kmem_free(map);
1057         return error;
1058 }
1059
1060 /*
1061  * Called by dqusage_adjust in doing a quotacheck.
1062  *
1063  * Given the inode, and a dquot id this updates both the incore dqout as well
1064  * as the buffer copy. This is so that once the quotacheck is done, we can
1065  * just log all the buffers, as opposed to logging numerous updates to
1066  * individual dquots.
1067  */
1068 STATIC int
1069 xfs_qm_quotacheck_dqadjust(
1070         struct xfs_inode        *ip,
1071         xfs_dqid_t              id,
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         int                     error;
1079
1080         error = xfs_qm_dqget(mp, ip, id, type,
1081                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1082         if (error) {
1083                 /*
1084                  * Shouldn't be able to turn off quotas here.
1085                  */
1086                 ASSERT(error != -ESRCH);
1087                 ASSERT(error != -ENOENT);
1088                 return error;
1089         }
1090
1091         trace_xfs_dqadjust(dqp);
1092
1093         /*
1094          * Adjust the inode count and the block count to reflect this inode's
1095          * resource usage.
1096          */
1097         be64_add_cpu(&dqp->q_core.d_icount, 1);
1098         dqp->q_res_icount++;
1099         if (nblks) {
1100                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1101                 dqp->q_res_bcount += nblks;
1102         }
1103         if (rtblks) {
1104                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1105                 dqp->q_res_rtbcount += rtblks;
1106         }
1107
1108         /*
1109          * Set default limits, adjust timers (since we changed usages)
1110          *
1111          * There are no timers for the default values set in the root dquot.
1112          */
1113         if (dqp->q_core.d_id) {
1114                 xfs_qm_adjust_dqlimits(mp, dqp);
1115                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1116         }
1117
1118         dqp->dq_flags |= XFS_DQ_DIRTY;
1119         xfs_qm_dqput(dqp);
1120         return 0;
1121 }
1122
1123 STATIC int
1124 xfs_qm_get_rtblks(
1125         xfs_inode_t     *ip,
1126         xfs_qcnt_t      *O_rtblks)
1127 {
1128         xfs_filblks_t   rtblks;                 /* total rt blks */
1129         xfs_extnum_t    idx;                    /* extent record index */
1130         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1131         xfs_extnum_t    nextents;               /* number of extent entries */
1132         int             error;
1133
1134         ASSERT(XFS_IS_REALTIME_INODE(ip));
1135         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1136         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1137                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1138                         return error;
1139         }
1140         rtblks = 0;
1141         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1142         for (idx = 0; idx < nextents; idx++)
1143                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1144         *O_rtblks = (xfs_qcnt_t)rtblks;
1145         return 0;
1146 }
1147
1148 /*
1149  * callback routine supplied to bulkstat(). Given an inumber, find its
1150  * dquots and update them to account for resources taken by that inode.
1151  */
1152 /* ARGSUSED */
1153 STATIC int
1154 xfs_qm_dqusage_adjust(
1155         xfs_mount_t     *mp,            /* mount point for filesystem */
1156         xfs_ino_t       ino,            /* inode number to get data for */
1157         void            __user *buffer, /* not used */
1158         int             ubsize,         /* not used */
1159         int             *ubused,        /* not used */
1160         int             *res)           /* result code value */
1161 {
1162         xfs_inode_t     *ip;
1163         xfs_qcnt_t      nblks, rtblks = 0;
1164         int             error;
1165
1166         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1167
1168         /*
1169          * rootino must have its resources accounted for, not so with the quota
1170          * inodes.
1171          */
1172         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1173                 *res = BULKSTAT_RV_NOTHING;
1174                 return -EINVAL;
1175         }
1176
1177         /*
1178          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1179          * interface expects the inode to be exclusively locked because that's
1180          * the case in all other instances. It's OK that we do this because
1181          * quotacheck is done only at mount time.
1182          */
1183         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1184         if (error) {
1185                 *res = BULKSTAT_RV_NOTHING;
1186                 return error;
1187         }
1188
1189         ASSERT(ip->i_delayed_blks == 0);
1190
1191         if (XFS_IS_REALTIME_INODE(ip)) {
1192                 /*
1193                  * Walk thru the extent list and count the realtime blocks.
1194                  */
1195                 error = xfs_qm_get_rtblks(ip, &rtblks);
1196                 if (error)
1197                         goto error0;
1198         }
1199
1200         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1201
1202         /*
1203          * Add the (disk blocks and inode) resources occupied by this
1204          * inode to its dquots. We do this adjustment in the incore dquot,
1205          * and also copy the changes to its buffer.
1206          * We don't care about putting these changes in a transaction
1207          * envelope because if we crash in the middle of a 'quotacheck'
1208          * we have to start from the beginning anyway.
1209          * Once we're done, we'll log all the dquot bufs.
1210          *
1211          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1212          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1213          */
1214         if (XFS_IS_UQUOTA_ON(mp)) {
1215                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1216                                                    XFS_DQ_USER, nblks, rtblks);
1217                 if (error)
1218                         goto error0;
1219         }
1220
1221         if (XFS_IS_GQUOTA_ON(mp)) {
1222                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1223                                                    XFS_DQ_GROUP, nblks, rtblks);
1224                 if (error)
1225                         goto error0;
1226         }
1227
1228         if (XFS_IS_PQUOTA_ON(mp)) {
1229                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1230                                                    XFS_DQ_PROJ, nblks, rtblks);
1231                 if (error)
1232                         goto error0;
1233         }
1234
1235         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1236         IRELE(ip);
1237         *res = BULKSTAT_RV_DIDONE;
1238         return 0;
1239
1240 error0:
1241         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1242         IRELE(ip);
1243         *res = BULKSTAT_RV_GIVEUP;
1244         return error;
1245 }
1246
1247 STATIC int
1248 xfs_qm_flush_one(
1249         struct xfs_dquot        *dqp,
1250         void                    *data)
1251 {
1252         struct list_head        *buffer_list = data;
1253         struct xfs_buf          *bp = NULL;
1254         int                     error = 0;
1255
1256         xfs_dqlock(dqp);
1257         if (dqp->dq_flags & XFS_DQ_FREEING)
1258                 goto out_unlock;
1259         if (!XFS_DQ_IS_DIRTY(dqp))
1260                 goto out_unlock;
1261
1262         xfs_dqflock(dqp);
1263         error = xfs_qm_dqflush(dqp, &bp);
1264         if (error)
1265                 goto out_unlock;
1266
1267         xfs_buf_delwri_queue(bp, buffer_list);
1268         xfs_buf_relse(bp);
1269 out_unlock:
1270         xfs_dqunlock(dqp);
1271         return error;
1272 }
1273
1274 /*
1275  * Walk thru all the filesystem inodes and construct a consistent view
1276  * of the disk quota world. If the quotacheck fails, disable quotas.
1277  */
1278 STATIC int
1279 xfs_qm_quotacheck(
1280         xfs_mount_t     *mp)
1281 {
1282         int                     done, count, error, error2;
1283         xfs_ino_t               lastino;
1284         size_t                  structsz;
1285         uint                    flags;
1286         LIST_HEAD               (buffer_list);
1287         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1288         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1289         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1290
1291         count = INT_MAX;
1292         structsz = 1;
1293         lastino = 0;
1294         flags = 0;
1295
1296         ASSERT(uip || gip || pip);
1297         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1298
1299         xfs_notice(mp, "Quotacheck needed: Please wait.");
1300
1301         /*
1302          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1303          * their counters to zero. We need a clean slate.
1304          * We don't log our changes till later.
1305          */
1306         if (uip) {
1307                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1308                                          &buffer_list);
1309                 if (error)
1310                         goto error_return;
1311                 flags |= XFS_UQUOTA_CHKD;
1312         }
1313
1314         if (gip) {
1315                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1316                                          &buffer_list);
1317                 if (error)
1318                         goto error_return;
1319                 flags |= XFS_GQUOTA_CHKD;
1320         }
1321
1322         if (pip) {
1323                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1324                                          &buffer_list);
1325                 if (error)
1326                         goto error_return;
1327                 flags |= XFS_PQUOTA_CHKD;
1328         }
1329
1330         do {
1331                 /*
1332                  * Iterate thru all the inodes in the file system,
1333                  * adjusting the corresponding dquot counters in core.
1334                  */
1335                 error = xfs_bulkstat(mp, &lastino, &count,
1336                                      xfs_qm_dqusage_adjust,
1337                                      structsz, NULL, &done);
1338                 if (error)
1339                         break;
1340
1341         } while (!done);
1342
1343         /*
1344          * We've made all the changes that we need to make incore.  Flush them
1345          * down to disk buffers if everything was updated successfully.
1346          */
1347         if (XFS_IS_UQUOTA_ON(mp)) {
1348                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1349                                           &buffer_list);
1350         }
1351         if (XFS_IS_GQUOTA_ON(mp)) {
1352                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1353                                            &buffer_list);
1354                 if (!error)
1355                         error = error2;
1356         }
1357         if (XFS_IS_PQUOTA_ON(mp)) {
1358                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1359                                            &buffer_list);
1360                 if (!error)
1361                         error = error2;
1362         }
1363
1364         error2 = xfs_buf_delwri_submit(&buffer_list);
1365         if (!error)
1366                 error = error2;
1367
1368         /*
1369          * We can get this error if we couldn't do a dquot allocation inside
1370          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1371          * dirty dquots that might be cached, we just want to get rid of them
1372          * and turn quotaoff. The dquots won't be attached to any of the inodes
1373          * at this point (because we intentionally didn't in dqget_noattach).
1374          */
1375         if (error) {
1376                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1377                 goto error_return;
1378         }
1379
1380         /*
1381          * If one type of quotas is off, then it will lose its
1382          * quotachecked status, since we won't be doing accounting for
1383          * that type anymore.
1384          */
1385         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1386         mp->m_qflags |= flags;
1387
1388  error_return:
1389         while (!list_empty(&buffer_list)) {
1390                 struct xfs_buf *bp =
1391                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1392                 list_del_init(&bp->b_list);
1393                 xfs_buf_relse(bp);
1394         }
1395
1396         if (error) {
1397                 xfs_warn(mp,
1398         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1399                         error);
1400                 /*
1401                  * We must turn off quotas.
1402                  */
1403                 ASSERT(mp->m_quotainfo != NULL);
1404                 xfs_qm_destroy_quotainfo(mp);
1405                 if (xfs_mount_reset_sbqflags(mp)) {
1406                         xfs_warn(mp,
1407                                 "Quotacheck: Failed to reset quota flags.");
1408                 }
1409         } else
1410                 xfs_notice(mp, "Quotacheck: Done.");
1411         return error;
1412 }
1413
1414 /*
1415  * This is called from xfs_mountfs to start quotas and initialize all
1416  * necessary data structures like quotainfo.  This is also responsible for
1417  * running a quotacheck as necessary.  We are guaranteed that the superblock
1418  * is consistently read in at this point.
1419  *
1420  * If we fail here, the mount will continue with quota turned off. We don't
1421  * need to inidicate success or failure at all.
1422  */
1423 void
1424 xfs_qm_mount_quotas(
1425         struct xfs_mount        *mp)
1426 {
1427         int                     error = 0;
1428         uint                    sbf;
1429
1430         /*
1431          * If quotas on realtime volumes is not supported, we disable
1432          * quotas immediately.
1433          */
1434         if (mp->m_sb.sb_rextents) {
1435                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1436                 mp->m_qflags = 0;
1437                 goto write_changes;
1438         }
1439
1440         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1441
1442         /*
1443          * Allocate the quotainfo structure inside the mount struct, and
1444          * create quotainode(s), and change/rev superblock if necessary.
1445          */
1446         error = xfs_qm_init_quotainfo(mp);
1447         if (error) {
1448                 /*
1449                  * We must turn off quotas.
1450                  */
1451                 ASSERT(mp->m_quotainfo == NULL);
1452                 mp->m_qflags = 0;
1453                 goto write_changes;
1454         }
1455         /*
1456          * If any of the quotas are not consistent, do a quotacheck.
1457          */
1458         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1459                 error = xfs_qm_quotacheck(mp);
1460                 if (error) {
1461                         /* Quotacheck failed and disabled quotas. */
1462                         return;
1463                 }
1464         }
1465         /*
1466          * If one type of quotas is off, then it will lose its
1467          * quotachecked status, since we won't be doing accounting for
1468          * that type anymore.
1469          */
1470         if (!XFS_IS_UQUOTA_ON(mp))
1471                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1472         if (!XFS_IS_GQUOTA_ON(mp))
1473                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1474         if (!XFS_IS_PQUOTA_ON(mp))
1475                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1476
1477  write_changes:
1478         /*
1479          * We actually don't have to acquire the m_sb_lock at all.
1480          * This can only be called from mount, and that's single threaded. XXX
1481          */
1482         spin_lock(&mp->m_sb_lock);
1483         sbf = mp->m_sb.sb_qflags;
1484         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1485         spin_unlock(&mp->m_sb_lock);
1486
1487         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1488                 if (xfs_sync_sb(mp, false)) {
1489                         /*
1490                          * We could only have been turning quotas off.
1491                          * We aren't in very good shape actually because
1492                          * the incore structures are convinced that quotas are
1493                          * off, but the on disk superblock doesn't know that !
1494                          */
1495                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1496                         xfs_alert(mp, "%s: Superblock update failed!",
1497                                 __func__);
1498                 }
1499         }
1500
1501         if (error) {
1502                 xfs_warn(mp, "Failed to initialize disk quotas.");
1503                 return;
1504         }
1505 }
1506
1507 /*
1508  * This is called after the superblock has been read in and we're ready to
1509  * iget the quota inodes.
1510  */
1511 STATIC int
1512 xfs_qm_init_quotainos(
1513         xfs_mount_t     *mp)
1514 {
1515         struct xfs_inode        *uip = NULL;
1516         struct xfs_inode        *gip = NULL;
1517         struct xfs_inode        *pip = NULL;
1518         int                     error;
1519         uint                    flags = 0;
1520
1521         ASSERT(mp->m_quotainfo);
1522
1523         /*
1524          * Get the uquota and gquota inodes
1525          */
1526         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1527                 if (XFS_IS_UQUOTA_ON(mp) &&
1528                     mp->m_sb.sb_uquotino != NULLFSINO) {
1529                         ASSERT(mp->m_sb.sb_uquotino > 0);
1530                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1531                                              0, 0, &uip);
1532                         if (error)
1533                                 return error;
1534                 }
1535                 if (XFS_IS_GQUOTA_ON(mp) &&
1536                     mp->m_sb.sb_gquotino != NULLFSINO) {
1537                         ASSERT(mp->m_sb.sb_gquotino > 0);
1538                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1539                                              0, 0, &gip);
1540                         if (error)
1541                                 goto error_rele;
1542                 }
1543                 if (XFS_IS_PQUOTA_ON(mp) &&
1544                     mp->m_sb.sb_pquotino != NULLFSINO) {
1545                         ASSERT(mp->m_sb.sb_pquotino > 0);
1546                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1547                                              0, 0, &pip);
1548                         if (error)
1549                                 goto error_rele;
1550                 }
1551         } else {
1552                 flags |= XFS_QMOPT_SBVERSION;
1553         }
1554
1555         /*
1556          * Create the three inodes, if they don't exist already. The changes
1557          * made above will get added to a transaction and logged in one of
1558          * the qino_alloc calls below.  If the device is readonly,
1559          * temporarily switch to read-write to do this.
1560          */
1561         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1562                 error = xfs_qm_qino_alloc(mp, &uip,
1563                                               flags | XFS_QMOPT_UQUOTA);
1564                 if (error)
1565                         goto error_rele;
1566
1567                 flags &= ~XFS_QMOPT_SBVERSION;
1568         }
1569         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1570                 error = xfs_qm_qino_alloc(mp, &gip,
1571                                           flags | XFS_QMOPT_GQUOTA);
1572                 if (error)
1573                         goto error_rele;
1574
1575                 flags &= ~XFS_QMOPT_SBVERSION;
1576         }
1577         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1578                 error = xfs_qm_qino_alloc(mp, &pip,
1579                                           flags | XFS_QMOPT_PQUOTA);
1580                 if (error)
1581                         goto error_rele;
1582         }
1583
1584         mp->m_quotainfo->qi_uquotaip = uip;
1585         mp->m_quotainfo->qi_gquotaip = gip;
1586         mp->m_quotainfo->qi_pquotaip = pip;
1587
1588         return 0;
1589
1590 error_rele:
1591         if (uip)
1592                 IRELE(uip);
1593         if (gip)
1594                 IRELE(gip);
1595         if (pip)
1596                 IRELE(pip);
1597         return error;
1598 }
1599
1600 STATIC void
1601 xfs_qm_dqfree_one(
1602         struct xfs_dquot        *dqp)
1603 {
1604         struct xfs_mount        *mp = dqp->q_mount;
1605         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1606
1607         mutex_lock(&qi->qi_tree_lock);
1608         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1609                           be32_to_cpu(dqp->q_core.d_id));
1610
1611         qi->qi_dquots--;
1612         mutex_unlock(&qi->qi_tree_lock);
1613
1614         xfs_qm_dqdestroy(dqp);
1615 }
1616
1617 /* --------------- utility functions for vnodeops ---------------- */
1618
1619
1620 /*
1621  * Given an inode, a uid, gid and prid make sure that we have
1622  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1623  * quotas by creating this file.
1624  * This also attaches dquot(s) to the given inode after locking it,
1625  * and returns the dquots corresponding to the uid and/or gid.
1626  *
1627  * in   : inode (unlocked)
1628  * out  : udquot, gdquot with references taken and unlocked
1629  */
1630 int
1631 xfs_qm_vop_dqalloc(
1632         struct xfs_inode        *ip,
1633         xfs_dqid_t              uid,
1634         xfs_dqid_t              gid,
1635         prid_t                  prid,
1636         uint                    flags,
1637         struct xfs_dquot        **O_udqpp,
1638         struct xfs_dquot        **O_gdqpp,
1639         struct xfs_dquot        **O_pdqpp)
1640 {
1641         struct xfs_mount        *mp = ip->i_mount;
1642         struct xfs_dquot        *uq = NULL;
1643         struct xfs_dquot        *gq = NULL;
1644         struct xfs_dquot        *pq = NULL;
1645         int                     error;
1646         uint                    lockflags;
1647
1648         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1649                 return 0;
1650
1651         lockflags = XFS_ILOCK_EXCL;
1652         xfs_ilock(ip, lockflags);
1653
1654         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1655                 gid = ip->i_d.di_gid;
1656
1657         /*
1658          * Attach the dquot(s) to this inode, doing a dquot allocation
1659          * if necessary. The dquot(s) will not be locked.
1660          */
1661         if (XFS_NOT_DQATTACHED(mp, ip)) {
1662                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1663                 if (error) {
1664                         xfs_iunlock(ip, lockflags);
1665                         return error;
1666                 }
1667         }
1668
1669         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1670                 if (ip->i_d.di_uid != uid) {
1671                         /*
1672                          * What we need is the dquot that has this uid, and
1673                          * if we send the inode to dqget, the uid of the inode
1674                          * takes priority over what's sent in the uid argument.
1675                          * We must unlock inode here before calling dqget if
1676                          * we're not sending the inode, because otherwise
1677                          * we'll deadlock by doing trans_reserve while
1678                          * holding ilock.
1679                          */
1680                         xfs_iunlock(ip, lockflags);
1681                         error = xfs_qm_dqget(mp, NULL, uid,
1682                                                  XFS_DQ_USER,
1683                                                  XFS_QMOPT_DQALLOC |
1684                                                  XFS_QMOPT_DOWARN,
1685                                                  &uq);
1686                         if (error) {
1687                                 ASSERT(error != -ENOENT);
1688                                 return error;
1689                         }
1690                         /*
1691                          * Get the ilock in the right order.
1692                          */
1693                         xfs_dqunlock(uq);
1694                         lockflags = XFS_ILOCK_SHARED;
1695                         xfs_ilock(ip, lockflags);
1696                 } else {
1697                         /*
1698                          * Take an extra reference, because we'll return
1699                          * this to caller
1700                          */
1701                         ASSERT(ip->i_udquot);
1702                         uq = xfs_qm_dqhold(ip->i_udquot);
1703                 }
1704         }
1705         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1706                 if (ip->i_d.di_gid != gid) {
1707                         xfs_iunlock(ip, lockflags);
1708                         error = xfs_qm_dqget(mp, NULL, gid,
1709                                                  XFS_DQ_GROUP,
1710                                                  XFS_QMOPT_DQALLOC |
1711                                                  XFS_QMOPT_DOWARN,
1712                                                  &gq);
1713                         if (error) {
1714                                 ASSERT(error != -ENOENT);
1715                                 goto error_rele;
1716                         }
1717                         xfs_dqunlock(gq);
1718                         lockflags = XFS_ILOCK_SHARED;
1719                         xfs_ilock(ip, lockflags);
1720                 } else {
1721                         ASSERT(ip->i_gdquot);
1722                         gq = xfs_qm_dqhold(ip->i_gdquot);
1723                 }
1724         }
1725         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1726                 if (xfs_get_projid(ip) != prid) {
1727                         xfs_iunlock(ip, lockflags);
1728                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1729                                                  XFS_DQ_PROJ,
1730                                                  XFS_QMOPT_DQALLOC |
1731                                                  XFS_QMOPT_DOWARN,
1732                                                  &pq);
1733                         if (error) {
1734                                 ASSERT(error != -ENOENT);
1735                                 goto error_rele;
1736                         }
1737                         xfs_dqunlock(pq);
1738                         lockflags = XFS_ILOCK_SHARED;
1739                         xfs_ilock(ip, lockflags);
1740                 } else {
1741                         ASSERT(ip->i_pdquot);
1742                         pq = xfs_qm_dqhold(ip->i_pdquot);
1743                 }
1744         }
1745         if (uq)
1746                 trace_xfs_dquot_dqalloc(ip);
1747
1748         xfs_iunlock(ip, lockflags);
1749         if (O_udqpp)
1750                 *O_udqpp = uq;
1751         else
1752                 xfs_qm_dqrele(uq);
1753         if (O_gdqpp)
1754                 *O_gdqpp = gq;
1755         else
1756                 xfs_qm_dqrele(gq);
1757         if (O_pdqpp)
1758                 *O_pdqpp = pq;
1759         else
1760                 xfs_qm_dqrele(pq);
1761         return 0;
1762
1763 error_rele:
1764         xfs_qm_dqrele(gq);
1765         xfs_qm_dqrele(uq);
1766         return error;
1767 }
1768
1769 /*
1770  * Actually transfer ownership, and do dquot modifications.
1771  * These were already reserved.
1772  */
1773 xfs_dquot_t *
1774 xfs_qm_vop_chown(
1775         xfs_trans_t     *tp,
1776         xfs_inode_t     *ip,
1777         xfs_dquot_t     **IO_olddq,
1778         xfs_dquot_t     *newdq)
1779 {
1780         xfs_dquot_t     *prevdq;
1781         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1782                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1783
1784
1785         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1786         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1787
1788         /* old dquot */
1789         prevdq = *IO_olddq;
1790         ASSERT(prevdq);
1791         ASSERT(prevdq != newdq);
1792
1793         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1794         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1795
1796         /* the sparkling new dquot */
1797         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1798         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1799
1800         /*
1801          * Take an extra reference, because the inode is going to keep
1802          * this dquot pointer even after the trans_commit.
1803          */
1804         *IO_olddq = xfs_qm_dqhold(newdq);
1805
1806         return prevdq;
1807 }
1808
1809 /*
1810  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1811  */
1812 int
1813 xfs_qm_vop_chown_reserve(
1814         struct xfs_trans        *tp,
1815         struct xfs_inode        *ip,
1816         struct xfs_dquot        *udqp,
1817         struct xfs_dquot        *gdqp,
1818         struct xfs_dquot        *pdqp,
1819         uint                    flags)
1820 {
1821         struct xfs_mount        *mp = ip->i_mount;
1822         uint                    delblks, blkflags, prjflags = 0;
1823         struct xfs_dquot        *udq_unres = NULL;
1824         struct xfs_dquot        *gdq_unres = NULL;
1825         struct xfs_dquot        *pdq_unres = NULL;
1826         struct xfs_dquot        *udq_delblks = NULL;
1827         struct xfs_dquot        *gdq_delblks = NULL;
1828         struct xfs_dquot        *pdq_delblks = NULL;
1829         int                     error;
1830
1831
1832         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1833         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1834
1835         delblks = ip->i_delayed_blks;
1836         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1837                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1838
1839         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1840             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1841                 udq_delblks = udqp;
1842                 /*
1843                  * If there are delayed allocation blocks, then we have to
1844                  * unreserve those from the old dquot, and add them to the
1845                  * new dquot.
1846                  */
1847                 if (delblks) {
1848                         ASSERT(ip->i_udquot);
1849                         udq_unres = ip->i_udquot;
1850                 }
1851         }
1852         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1853             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1854                 gdq_delblks = gdqp;
1855                 if (delblks) {
1856                         ASSERT(ip->i_gdquot);
1857                         gdq_unres = ip->i_gdquot;
1858                 }
1859         }
1860
1861         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1862             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1863                 prjflags = XFS_QMOPT_ENOSPC;
1864                 pdq_delblks = pdqp;
1865                 if (delblks) {
1866                         ASSERT(ip->i_pdquot);
1867                         pdq_unres = ip->i_pdquot;
1868                 }
1869         }
1870
1871         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1872                                 udq_delblks, gdq_delblks, pdq_delblks,
1873                                 ip->i_d.di_nblocks, 1,
1874                                 flags | blkflags | prjflags);
1875         if (error)
1876                 return error;
1877
1878         /*
1879          * Do the delayed blks reservations/unreservations now. Since, these
1880          * are done without the help of a transaction, if a reservation fails
1881          * its previous reservations won't be automatically undone by trans
1882          * code. So, we have to do it manually here.
1883          */
1884         if (delblks) {
1885                 /*
1886                  * Do the reservations first. Unreservation can't fail.
1887                  */
1888                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1889                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1890                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1891                             udq_delblks, gdq_delblks, pdq_delblks,
1892                             (xfs_qcnt_t)delblks, 0,
1893                             flags | blkflags | prjflags);
1894                 if (error)
1895                         return error;
1896                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1897                                 udq_unres, gdq_unres, pdq_unres,
1898                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1899         }
1900
1901         return 0;
1902 }
1903
1904 int
1905 xfs_qm_vop_rename_dqattach(
1906         struct xfs_inode        **i_tab)
1907 {
1908         struct xfs_mount        *mp = i_tab[0]->i_mount;
1909         int                     i;
1910
1911         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1912                 return 0;
1913
1914         for (i = 0; (i < 4 && i_tab[i]); i++) {
1915                 struct xfs_inode        *ip = i_tab[i];
1916                 int                     error;
1917
1918                 /*
1919                  * Watch out for duplicate entries in the table.
1920                  */
1921                 if (i == 0 || ip != i_tab[i-1]) {
1922                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1923                                 error = xfs_qm_dqattach(ip, 0);
1924                                 if (error)
1925                                         return error;
1926                         }
1927                 }
1928         }
1929         return 0;
1930 }
1931
1932 void
1933 xfs_qm_vop_create_dqattach(
1934         struct xfs_trans        *tp,
1935         struct xfs_inode        *ip,
1936         struct xfs_dquot        *udqp,
1937         struct xfs_dquot        *gdqp,
1938         struct xfs_dquot        *pdqp)
1939 {
1940         struct xfs_mount        *mp = tp->t_mountp;
1941
1942         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1943                 return;
1944
1945         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1946         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1947
1948         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1949                 ASSERT(ip->i_udquot == NULL);
1950                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1951
1952                 ip->i_udquot = xfs_qm_dqhold(udqp);
1953                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1954         }
1955         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1956                 ASSERT(ip->i_gdquot == NULL);
1957                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1958                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1959                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1960         }
1961         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1962                 ASSERT(ip->i_pdquot == NULL);
1963                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1964
1965                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1966                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1967         }
1968 }
1969