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         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 787                         XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 788         if (error)
 789                 return error;
 790
 791         if (need_alloc) {
 792                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 793                                                                 &committed);
 794                 if (error) {
 795                         xfs_trans_cancel(tp);
 796                         return error;
 797                 }
 798         }
 799
 800         /*
 801          * Make the changes in the superblock, and log those too.
 802          * sbfields arg may contain fields other than *QUOTINO;
 803          * VERSIONNUM for example.
 804          */
 805         spin_lock(&mp->m_sb_lock);
 806         if (flags & XFS_QMOPT_SBVERSION) {
 807                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 808
 809                 xfs_sb_version_addquota(&mp->m_sb);
 810                 mp->m_sb.sb_uquotino = NULLFSINO;
 811                 mp->m_sb.sb_gquotino = NULLFSINO;
 812                 mp->m_sb.sb_pquotino = NULLFSINO;
 813
 814                 /* qflags will get updated fully _after_ quotacheck */
 815                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 816         }
 817         if (flags & XFS_QMOPT_UQUOTA)
 818                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 819         else if (flags & XFS_QMOPT_GQUOTA)
 820                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 821         else
 822                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 823         spin_unlock(&mp->m_sb_lock);
 824         xfs_log_sb(tp);
 825
 826         error = xfs_trans_commit(tp);
 827         if (error) {
 828                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 829                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 830         }
 831         if (need_alloc)
 832                 xfs_finish_inode_setup(*ip);
 833         return error;
 834 }
 835
 836
 837 STATIC void
 838 xfs_qm_reset_dqcounts(
 839         xfs_mount_t     *mp,
 840         xfs_buf_t       *bp,
 841         xfs_dqid_t      id,
 842         uint            type)
 843 {
 844         struct xfs_dqblk        *dqb;
 845         int                     j;
 846
 847         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 848
 849         /*
 850          * Reset all counters and timers. They'll be
 851          * started afresh by xfs_qm_quotacheck.
 852          */
 853 #ifdef DEBUG
 854         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 855         do_div(j, sizeof(xfs_dqblk_t));
 856         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 857 #endif
 858         dqb = bp->b_addr;
 859         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 860                 struct xfs_disk_dquot   *ddq;
 861
 862                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 863
 864                 /*
 865                  * Do a sanity check, and if needed, repair the dqblk. Don't
 866                  * output any warnings because it's perfectly possible to
 867                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 868                  */
 869                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 870                             "xfs_quotacheck");
 871                 /*
 872                  * Reset type in case we are reusing group quota file for
 873                  * project quotas or vice versa
 874                  */
 875                 ddq->d_flags = type;
 876                 ddq->d_bcount = 0;
 877                 ddq->d_icount = 0;
 878                 ddq->d_rtbcount = 0;
 879                 ddq->d_btimer = 0;
 880                 ddq->d_itimer = 0;
 881                 ddq->d_rtbtimer = 0;
 882                 ddq->d_bwarns = 0;
 883                 ddq->d_iwarns = 0;
 884                 ddq->d_rtbwarns = 0;
 885
 886                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 887                         xfs_update_cksum((char *)&dqb[j],
 888                                          sizeof(struct xfs_dqblk),
 889                                          XFS_DQUOT_CRC_OFF);
 890                 }
 891         }
 892 }
 893
 894 STATIC int
 895 xfs_qm_dqiter_bufs(
 896         struct xfs_mount        *mp,
 897         xfs_dqid_t              firstid,
 898         xfs_fsblock_t           bno,
 899         xfs_filblks_t           blkcnt,
 900         uint                    flags,
 901         struct list_head        *buffer_list)
 902 {
 903         struct xfs_buf          *bp;
 904         int                     error;
 905         int                     type;
 906
 907         ASSERT(blkcnt > 0);
 908         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 909                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 910         error = 0;
 911
 912         /*
 913          * Blkcnt arg can be a very big number, and might even be
 914          * larger than the log itself. So, we have to break it up into
 915          * manageable-sized transactions.
 916          * Note that we don't start a permanent transaction here; we might
 917          * not be able to get a log reservation for the whole thing up front,
 918          * and we don't really care to either, because we just discard
 919          * everything if we were to crash in the middle of this loop.
 920          */
 921         while (blkcnt--) {
 922                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 923                               XFS_FSB_TO_DADDR(mp, bno),
 924                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 925                               &xfs_dquot_buf_ops);
 926
 927                 /*
 928                  * CRC and validation errors will return a EFSCORRUPTED here. If
 929                  * this occurs, re-read without CRC validation so that we can
 930                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 931                  * will leave a trace in the log indicating corruption has
 932                  * been detected.
 933                  */
 934                 if (error == -EFSCORRUPTED) {
 935                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 936                                       XFS_FSB_TO_DADDR(mp, bno),
 937                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 938                                       NULL);
 939                 }
 940
 941                 if (error)
 942                         break;
 943
 944                 /*
 945                  * A corrupt buffer might not have a verifier attached, so
 946                  * make sure we have the correct one attached before writeback
 947                  * occurs.
 948                  */
 949                 bp->b_ops = &xfs_dquot_buf_ops;
 950                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 951                 xfs_buf_delwri_queue(bp, buffer_list);
 952                 xfs_buf_relse(bp);
 953
 954                 /* goto the next block. */
 955                 bno++;
 956                 firstid += mp->m_quotainfo->qi_dqperchunk;
 957         }
 958
 959         return error;
 960 }
 961
 962 /*
 963  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 964  * caller supplied function for every chunk of dquots that we find.
 965  */
 966 STATIC int
 967 xfs_qm_dqiterate(
 968         struct xfs_mount        *mp,
 969         struct xfs_inode        *qip,
 970         uint                    flags,
 971         struct list_head        *buffer_list)
 972 {
 973         struct xfs_bmbt_irec    *map;
 974         int                     i, nmaps;       /* number of map entries */
 975         int                     error;          /* return value */
 976         xfs_fileoff_t           lblkno;
 977         xfs_filblks_t           maxlblkcnt;
 978         xfs_dqid_t              firstid;
 979         xfs_fsblock_t           rablkno;
 980         xfs_filblks_t           rablkcnt;
 981
 982         error = 0;
 983         /*
 984          * This looks racy, but we can't keep an inode lock across a
 985          * trans_reserve. But, this gets called during quotacheck, and that
 986          * happens only at mount time which is single threaded.
 987          */
 988         if (qip->i_d.di_nblocks == 0)
 989                 return 0;
 990
 991         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 992
 993         lblkno = 0;
 994         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 995         do {
 996                 uint            lock_mode;
 997
 998                 nmaps = XFS_DQITER_MAP_SIZE;
 999                 /*
1000                  * We aren't changing the inode itself. Just changing
1001                  * some of its data. No new blocks are added here, and
1002                  * the inode is never added to the transaction.
1003                  */
1004                 lock_mode = xfs_ilock_data_map_shared(qip);
1005                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1006                                        map, &nmaps, 0);
1007                 xfs_iunlock(qip, lock_mode);
1008                 if (error)
1009                         break;
1010
1011                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1012                 for (i = 0; i < nmaps; i++) {
1013                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1014                         ASSERT(map[i].br_blockcount);
1015
1016
1017                         lblkno += map[i].br_blockcount;
1018
1019                         if (map[i].br_startblock == HOLESTARTBLOCK)
1020                                 continue;
1021
1022                         firstid = (xfs_dqid_t) map[i].br_startoff *
1023                                 mp->m_quotainfo->qi_dqperchunk;
1024                         /*
1025                          * Do a read-ahead on the next extent.
1026                          */
1027                         if ((i+1 < nmaps) &&
1028                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1029                                 rablkcnt =  map[i+1].br_blockcount;
1030                                 rablkno = map[i+1].br_startblock;
1031                                 while (rablkcnt--) {
1032                                         xfs_buf_readahead(mp->m_ddev_targp,
1033                                                XFS_FSB_TO_DADDR(mp, rablkno),
1034                                                mp->m_quotainfo->qi_dqchunklen,
1035                                                &xfs_dquot_buf_ops);
1036                                         rablkno++;
1037                                 }
1038                         }
1039                         /*
1040                          * Iterate thru all the blks in the extent and
1041                          * reset the counters of all the dquots inside them.
1042                          */
1043                         error = xfs_qm_dqiter_bufs(mp, firstid,
1044                                                    map[i].br_startblock,
1045                                                    map[i].br_blockcount,
1046                                                    flags, buffer_list);
1047                         if (error)
1048                                 goto out;
1049                 }
1050         } while (nmaps > 0);
1051
1052 out:
1053         kmem_free(map);
1054         return error;
1055 }
1056
1057 /*
1058  * Called by dqusage_adjust in doing a quotacheck.
1059  *
1060  * Given the inode, and a dquot id this updates both the incore dqout as well
1061  * as the buffer copy. This is so that once the quotacheck is done, we can
1062  * just log all the buffers, as opposed to logging numerous updates to
1063  * individual dquots.
1064  */
1065 STATIC int
1066 xfs_qm_quotacheck_dqadjust(
1067         struct xfs_inode        *ip,
1068         xfs_dqid_t              id,
1069         uint                    type,
1070         xfs_qcnt_t              nblks,
1071         xfs_qcnt_t              rtblks)
1072 {
1073         struct xfs_mount        *mp = ip->i_mount;
1074         struct xfs_dquot        *dqp;
1075         int                     error;
1076
1077         error = xfs_qm_dqget(mp, ip, id, type,
1078                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1079         if (error) {
1080                 /*
1081                  * Shouldn't be able to turn off quotas here.
1082                  */
1083                 ASSERT(error != -ESRCH);
1084                 ASSERT(error != -ENOENT);
1085                 return error;
1086         }
1087
1088         trace_xfs_dqadjust(dqp);
1089
1090         /*
1091          * Adjust the inode count and the block count to reflect this inode's
1092          * resource usage.
1093          */
1094         be64_add_cpu(&dqp->q_core.d_icount, 1);
1095         dqp->q_res_icount++;
1096         if (nblks) {
1097                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1098                 dqp->q_res_bcount += nblks;
1099         }
1100         if (rtblks) {
1101                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1102                 dqp->q_res_rtbcount += rtblks;
1103         }
1104
1105         /*
1106          * Set default limits, adjust timers (since we changed usages)
1107          *
1108          * There are no timers for the default values set in the root dquot.
1109          */
1110         if (dqp->q_core.d_id) {
1111                 xfs_qm_adjust_dqlimits(mp, dqp);
1112                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1113         }
1114
1115         dqp->dq_flags |= XFS_DQ_DIRTY;
1116         xfs_qm_dqput(dqp);
1117         return 0;
1118 }
1119
1120 STATIC int
1121 xfs_qm_get_rtblks(
1122         xfs_inode_t     *ip,
1123         xfs_qcnt_t      *O_rtblks)
1124 {
1125         xfs_filblks_t   rtblks;                 /* total rt blks */
1126         xfs_extnum_t    idx;                    /* extent record index */
1127         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1128         xfs_extnum_t    nextents;               /* number of extent entries */
1129         int             error;
1130
1131         ASSERT(XFS_IS_REALTIME_INODE(ip));
1132         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1133         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1134                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1135                         return error;
1136         }
1137         rtblks = 0;
1138         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1139         for (idx = 0; idx < nextents; idx++)
1140                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1141         *O_rtblks = (xfs_qcnt_t)rtblks;
1142         return 0;
1143 }
1144
1145 /*
1146  * callback routine supplied to bulkstat(). Given an inumber, find its
1147  * dquots and update them to account for resources taken by that inode.
1148  */
1149 /* ARGSUSED */
1150 STATIC int
1151 xfs_qm_dqusage_adjust(
1152         xfs_mount_t     *mp,            /* mount point for filesystem */
1153         xfs_ino_t       ino,            /* inode number to get data for */
1154         void            __user *buffer, /* not used */
1155         int             ubsize,         /* not used */
1156         int             *ubused,        /* not used */
1157         int             *res)           /* result code value */
1158 {
1159         xfs_inode_t     *ip;
1160         xfs_qcnt_t      nblks, rtblks = 0;
1161         int             error;
1162
1163         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1164
1165         /*
1166          * rootino must have its resources accounted for, not so with the quota
1167          * inodes.
1168          */
1169         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1170                 *res = BULKSTAT_RV_NOTHING;
1171                 return -EINVAL;
1172         }
1173
1174         /*
1175          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1176          * interface expects the inode to be exclusively locked because that's
1177          * the case in all other instances. It's OK that we do this because
1178          * quotacheck is done only at mount time.
1179          */
1180         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1181         if (error) {
1182                 *res = BULKSTAT_RV_NOTHING;
1183                 return error;
1184         }
1185
1186         ASSERT(ip->i_delayed_blks == 0);
1187
1188         if (XFS_IS_REALTIME_INODE(ip)) {
1189                 /*
1190                  * Walk thru the extent list and count the realtime blocks.
1191                  */
1192                 error = xfs_qm_get_rtblks(ip, &rtblks);
1193                 if (error)
1194                         goto error0;
1195         }
1196
1197         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1198
1199         /*
1200          * Add the (disk blocks and inode) resources occupied by this
1201          * inode to its dquots. We do this adjustment in the incore dquot,
1202          * and also copy the changes to its buffer.
1203          * We don't care about putting these changes in a transaction
1204          * envelope because if we crash in the middle of a 'quotacheck'
1205          * we have to start from the beginning anyway.
1206          * Once we're done, we'll log all the dquot bufs.
1207          *
1208          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1209          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1210          */
1211         if (XFS_IS_UQUOTA_ON(mp)) {
1212                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1213                                                    XFS_DQ_USER, nblks, rtblks);
1214                 if (error)
1215                         goto error0;
1216         }
1217
1218         if (XFS_IS_GQUOTA_ON(mp)) {
1219                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1220                                                    XFS_DQ_GROUP, nblks, rtblks);
1221                 if (error)
1222                         goto error0;
1223         }
1224
1225         if (XFS_IS_PQUOTA_ON(mp)) {
1226                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1227                                                    XFS_DQ_PROJ, nblks, rtblks);
1228                 if (error)
1229                         goto error0;
1230         }
1231
1232         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1233         IRELE(ip);
1234         *res = BULKSTAT_RV_DIDONE;
1235         return 0;
1236
1237 error0:
1238         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1239         IRELE(ip);
1240         *res = BULKSTAT_RV_GIVEUP;
1241         return error;
1242 }
1243
1244 STATIC int
1245 xfs_qm_flush_one(
1246         struct xfs_dquot        *dqp,
1247         void                    *data)
1248 {
1249         struct list_head        *buffer_list = data;
1250         struct xfs_buf          *bp = NULL;
1251         int                     error = 0;
1252
1253         xfs_dqlock(dqp);
1254         if (dqp->dq_flags & XFS_DQ_FREEING)
1255                 goto out_unlock;
1256         if (!XFS_DQ_IS_DIRTY(dqp))
1257                 goto out_unlock;
1258
1259         xfs_dqflock(dqp);
1260         error = xfs_qm_dqflush(dqp, &bp);
1261         if (error)
1262                 goto out_unlock;
1263
1264         xfs_buf_delwri_queue(bp, buffer_list);
1265         xfs_buf_relse(bp);
1266 out_unlock:
1267         xfs_dqunlock(dqp);
1268         return error;
1269 }
1270
1271 /*
1272  * Walk thru all the filesystem inodes and construct a consistent view
1273  * of the disk quota world. If the quotacheck fails, disable quotas.
1274  */
1275 STATIC int
1276 xfs_qm_quotacheck(
1277         xfs_mount_t     *mp)
1278 {
1279         int                     done, count, error, error2;
1280         xfs_ino_t               lastino;
1281         size_t                  structsz;
1282         uint                    flags;
1283         LIST_HEAD               (buffer_list);
1284         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1285         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1286         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1287
1288         count = INT_MAX;
1289         structsz = 1;
1290         lastino = 0;
1291         flags = 0;
1292
1293         ASSERT(uip || gip || pip);
1294         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1295
1296         xfs_notice(mp, "Quotacheck needed: Please wait.");
1297
1298         /*
1299          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1300          * their counters to zero. We need a clean slate.
1301          * We don't log our changes till later.
1302          */
1303         if (uip) {
1304                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1305                                          &buffer_list);
1306                 if (error)
1307                         goto error_return;
1308                 flags |= XFS_UQUOTA_CHKD;
1309         }
1310
1311         if (gip) {
1312                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1313                                          &buffer_list);
1314                 if (error)
1315                         goto error_return;
1316                 flags |= XFS_GQUOTA_CHKD;
1317         }
1318
1319         if (pip) {
1320                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1321                                          &buffer_list);
1322                 if (error)
1323                         goto error_return;
1324                 flags |= XFS_PQUOTA_CHKD;
1325         }
1326
1327         do {
1328                 /*
1329                  * Iterate thru all the inodes in the file system,
1330                  * adjusting the corresponding dquot counters in core.
1331                  */
1332                 error = xfs_bulkstat(mp, &lastino, &count,
1333                                      xfs_qm_dqusage_adjust,
1334                                      structsz, NULL, &done);
1335                 if (error)
1336                         break;
1337
1338         } while (!done);
1339
1340         /*
1341          * We've made all the changes that we need to make incore.  Flush them
1342          * down to disk buffers if everything was updated successfully.
1343          */
1344         if (XFS_IS_UQUOTA_ON(mp)) {
1345                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1346                                           &buffer_list);
1347         }
1348         if (XFS_IS_GQUOTA_ON(mp)) {
1349                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1350                                            &buffer_list);
1351                 if (!error)
1352                         error = error2;
1353         }
1354         if (XFS_IS_PQUOTA_ON(mp)) {
1355                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1356                                            &buffer_list);
1357                 if (!error)
1358                         error = error2;
1359         }
1360
1361         error2 = xfs_buf_delwri_submit(&buffer_list);
1362         if (!error)
1363                 error = error2;
1364
1365         /*
1366          * We can get this error if we couldn't do a dquot allocation inside
1367          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1368          * dirty dquots that might be cached, we just want to get rid of them
1369          * and turn quotaoff. The dquots won't be attached to any of the inodes
1370          * at this point (because we intentionally didn't in dqget_noattach).
1371          */
1372         if (error) {
1373                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1374                 goto error_return;
1375         }
1376
1377         /*
1378          * If one type of quotas is off, then it will lose its
1379          * quotachecked status, since we won't be doing accounting for
1380          * that type anymore.
1381          */
1382         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1383         mp->m_qflags |= flags;
1384
1385  error_return:
1386         while (!list_empty(&buffer_list)) {
1387                 struct xfs_buf *bp =
1388                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1389                 list_del_init(&bp->b_list);
1390                 xfs_buf_relse(bp);
1391         }
1392
1393         if (error) {
1394                 xfs_warn(mp,
1395         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1396                         error);
1397                 /*
1398                  * We must turn off quotas.
1399                  */
1400                 ASSERT(mp->m_quotainfo != NULL);
1401                 xfs_qm_destroy_quotainfo(mp);
1402                 if (xfs_mount_reset_sbqflags(mp)) {
1403                         xfs_warn(mp,
1404                                 "Quotacheck: Failed to reset quota flags.");
1405                 }
1406         } else
1407                 xfs_notice(mp, "Quotacheck: Done.");
1408         return error;
1409 }
1410
1411 /*
1412  * This is called from xfs_mountfs to start quotas and initialize all
1413  * necessary data structures like quotainfo.  This is also responsible for
1414  * running a quotacheck as necessary.  We are guaranteed that the superblock
1415  * is consistently read in at this point.
1416  *
1417  * If we fail here, the mount will continue with quota turned off. We don't
1418  * need to inidicate success or failure at all.
1419  */
1420 void
1421 xfs_qm_mount_quotas(
1422         struct xfs_mount        *mp)
1423 {
1424         int                     error = 0;
1425         uint                    sbf;
1426
1427         /*
1428          * If quotas on realtime volumes is not supported, we disable
1429          * quotas immediately.
1430          */
1431         if (mp->m_sb.sb_rextents) {
1432                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1433                 mp->m_qflags = 0;
1434                 goto write_changes;
1435         }
1436
1437         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1438
1439         /*
1440          * Allocate the quotainfo structure inside the mount struct, and
1441          * create quotainode(s), and change/rev superblock if necessary.
1442          */
1443         error = xfs_qm_init_quotainfo(mp);
1444         if (error) {
1445                 /*
1446                  * We must turn off quotas.
1447                  */
1448                 ASSERT(mp->m_quotainfo == NULL);
1449                 mp->m_qflags = 0;
1450                 goto write_changes;
1451         }
1452         /*
1453          * If any of the quotas are not consistent, do a quotacheck.
1454          */
1455         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1456                 error = xfs_qm_quotacheck(mp);
1457                 if (error) {
1458                         /* Quotacheck failed and disabled quotas. */
1459                         return;
1460                 }
1461         }
1462         /*
1463          * If one type of quotas is off, then it will lose its
1464          * quotachecked status, since we won't be doing accounting for
1465          * that type anymore.
1466          */
1467         if (!XFS_IS_UQUOTA_ON(mp))
1468                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1469         if (!XFS_IS_GQUOTA_ON(mp))
1470                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1471         if (!XFS_IS_PQUOTA_ON(mp))
1472                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1473
1474  write_changes:
1475         /*
1476          * We actually don't have to acquire the m_sb_lock at all.
1477          * This can only be called from mount, and that's single threaded. XXX
1478          */
1479         spin_lock(&mp->m_sb_lock);
1480         sbf = mp->m_sb.sb_qflags;
1481         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1482         spin_unlock(&mp->m_sb_lock);
1483
1484         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1485                 if (xfs_sync_sb(mp, false)) {
1486                         /*
1487                          * We could only have been turning quotas off.
1488                          * We aren't in very good shape actually because
1489                          * the incore structures are convinced that quotas are
1490                          * off, but the on disk superblock doesn't know that !
1491                          */
1492                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1493                         xfs_alert(mp, "%s: Superblock update failed!",
1494                                 __func__);
1495                 }
1496         }
1497
1498         if (error) {
1499                 xfs_warn(mp, "Failed to initialize disk quotas.");
1500                 return;
1501         }
1502 }
1503
1504 /*
1505  * This is called after the superblock has been read in and we're ready to
1506  * iget the quota inodes.
1507  */
1508 STATIC int
1509 xfs_qm_init_quotainos(
1510         xfs_mount_t     *mp)
1511 {
1512         struct xfs_inode        *uip = NULL;
1513         struct xfs_inode        *gip = NULL;
1514         struct xfs_inode        *pip = NULL;
1515         int                     error;
1516         uint                    flags = 0;
1517
1518         ASSERT(mp->m_quotainfo);
1519
1520         /*
1521          * Get the uquota and gquota inodes
1522          */
1523         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1524                 if (XFS_IS_UQUOTA_ON(mp) &&
1525                     mp->m_sb.sb_uquotino != NULLFSINO) {
1526                         ASSERT(mp->m_sb.sb_uquotino > 0);
1527                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1528                                              0, 0, &uip);
1529                         if (error)
1530                                 return error;
1531                 }
1532                 if (XFS_IS_GQUOTA_ON(mp) &&
1533                     mp->m_sb.sb_gquotino != NULLFSINO) {
1534                         ASSERT(mp->m_sb.sb_gquotino > 0);
1535                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1536                                              0, 0, &gip);
1537                         if (error)
1538                                 goto error_rele;
1539                 }
1540                 if (XFS_IS_PQUOTA_ON(mp) &&
1541                     mp->m_sb.sb_pquotino != NULLFSINO) {
1542                         ASSERT(mp->m_sb.sb_pquotino > 0);
1543                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1544                                              0, 0, &pip);
1545                         if (error)
1546                                 goto error_rele;
1547                 }
1548         } else {
1549                 flags |= XFS_QMOPT_SBVERSION;
1550         }
1551
1552         /*
1553          * Create the three inodes, if they don't exist already. The changes
1554          * made above will get added to a transaction and logged in one of
1555          * the qino_alloc calls below.  If the device is readonly,
1556          * temporarily switch to read-write to do this.
1557          */
1558         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1559                 error = xfs_qm_qino_alloc(mp, &uip,
1560                                               flags | XFS_QMOPT_UQUOTA);
1561                 if (error)
1562                         goto error_rele;
1563
1564                 flags &= ~XFS_QMOPT_SBVERSION;
1565         }
1566         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1567                 error = xfs_qm_qino_alloc(mp, &gip,
1568                                           flags | XFS_QMOPT_GQUOTA);
1569                 if (error)
1570                         goto error_rele;
1571
1572                 flags &= ~XFS_QMOPT_SBVERSION;
1573         }
1574         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1575                 error = xfs_qm_qino_alloc(mp, &pip,
1576                                           flags | XFS_QMOPT_PQUOTA);
1577                 if (error)
1578                         goto error_rele;
1579         }
1580
1581         mp->m_quotainfo->qi_uquotaip = uip;
1582         mp->m_quotainfo->qi_gquotaip = gip;
1583         mp->m_quotainfo->qi_pquotaip = pip;
1584
1585         return 0;
1586
1587 error_rele:
1588         if (uip)
1589                 IRELE(uip);
1590         if (gip)
1591                 IRELE(gip);
1592         if (pip)
1593                 IRELE(pip);
1594         return error;
1595 }
1596
1597 STATIC void
1598 xfs_qm_dqfree_one(
1599         struct xfs_dquot        *dqp)
1600 {
1601         struct xfs_mount        *mp = dqp->q_mount;
1602         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1603
1604         mutex_lock(&qi->qi_tree_lock);
1605         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1606                           be32_to_cpu(dqp->q_core.d_id));
1607
1608         qi->qi_dquots--;
1609         mutex_unlock(&qi->qi_tree_lock);
1610
1611         xfs_qm_dqdestroy(dqp);
1612 }
1613
1614 /* --------------- utility functions for vnodeops ---------------- */
1615
1616
1617 /*
1618  * Given an inode, a uid, gid and prid make sure that we have
1619  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1620  * quotas by creating this file.
1621  * This also attaches dquot(s) to the given inode after locking it,
1622  * and returns the dquots corresponding to the uid and/or gid.
1623  *
1624  * in   : inode (unlocked)
1625  * out  : udquot, gdquot with references taken and unlocked
1626  */
1627 int
1628 xfs_qm_vop_dqalloc(
1629         struct xfs_inode        *ip,
1630         xfs_dqid_t              uid,
1631         xfs_dqid_t              gid,
1632         prid_t                  prid,
1633         uint                    flags,
1634         struct xfs_dquot        **O_udqpp,
1635         struct xfs_dquot        **O_gdqpp,
1636         struct xfs_dquot        **O_pdqpp)
1637 {
1638         struct xfs_mount        *mp = ip->i_mount;
1639         struct xfs_dquot        *uq = NULL;
1640         struct xfs_dquot        *gq = NULL;
1641         struct xfs_dquot        *pq = NULL;
1642         int                     error;
1643         uint                    lockflags;
1644
1645         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1646                 return 0;
1647
1648         lockflags = XFS_ILOCK_EXCL;
1649         xfs_ilock(ip, lockflags);
1650
1651         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1652                 gid = ip->i_d.di_gid;
1653
1654         /*
1655          * Attach the dquot(s) to this inode, doing a dquot allocation
1656          * if necessary. The dquot(s) will not be locked.
1657          */
1658         if (XFS_NOT_DQATTACHED(mp, ip)) {
1659                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1660                 if (error) {
1661                         xfs_iunlock(ip, lockflags);
1662                         return error;
1663                 }
1664         }
1665
1666         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1667                 if (ip->i_d.di_uid != uid) {
1668                         /*
1669                          * What we need is the dquot that has this uid, and
1670                          * if we send the inode to dqget, the uid of the inode
1671                          * takes priority over what's sent in the uid argument.
1672                          * We must unlock inode here before calling dqget if
1673                          * we're not sending the inode, because otherwise
1674                          * we'll deadlock by doing trans_reserve while
1675                          * holding ilock.
1676                          */
1677                         xfs_iunlock(ip, lockflags);
1678                         error = xfs_qm_dqget(mp, NULL, uid,
1679                                                  XFS_DQ_USER,
1680                                                  XFS_QMOPT_DQALLOC |
1681                                                  XFS_QMOPT_DOWARN,
1682                                                  &uq);
1683                         if (error) {
1684                                 ASSERT(error != -ENOENT);
1685                                 return error;
1686                         }
1687                         /*
1688                          * Get the ilock in the right order.
1689                          */
1690                         xfs_dqunlock(uq);
1691                         lockflags = XFS_ILOCK_SHARED;
1692                         xfs_ilock(ip, lockflags);
1693                 } else {
1694                         /*
1695                          * Take an extra reference, because we'll return
1696                          * this to caller
1697                          */
1698                         ASSERT(ip->i_udquot);
1699                         uq = xfs_qm_dqhold(ip->i_udquot);
1700                 }
1701         }
1702         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1703                 if (ip->i_d.di_gid != gid) {
1704                         xfs_iunlock(ip, lockflags);
1705                         error = xfs_qm_dqget(mp, NULL, gid,
1706                                                  XFS_DQ_GROUP,
1707                                                  XFS_QMOPT_DQALLOC |
1708                                                  XFS_QMOPT_DOWARN,
1709                                                  &gq);
1710                         if (error) {
1711                                 ASSERT(error != -ENOENT);
1712                                 goto error_rele;
1713                         }
1714                         xfs_dqunlock(gq);
1715                         lockflags = XFS_ILOCK_SHARED;
1716                         xfs_ilock(ip, lockflags);
1717                 } else {
1718                         ASSERT(ip->i_gdquot);
1719                         gq = xfs_qm_dqhold(ip->i_gdquot);
1720                 }
1721         }
1722         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1723                 if (xfs_get_projid(ip) != prid) {
1724                         xfs_iunlock(ip, lockflags);
1725                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1726                                                  XFS_DQ_PROJ,
1727                                                  XFS_QMOPT_DQALLOC |
1728                                                  XFS_QMOPT_DOWARN,
1729                                                  &pq);
1730                         if (error) {
1731                                 ASSERT(error != -ENOENT);
1732                                 goto error_rele;
1733                         }
1734                         xfs_dqunlock(pq);
1735                         lockflags = XFS_ILOCK_SHARED;
1736                         xfs_ilock(ip, lockflags);
1737                 } else {
1738                         ASSERT(ip->i_pdquot);
1739                         pq = xfs_qm_dqhold(ip->i_pdquot);
1740                 }
1741         }
1742         if (uq)
1743                 trace_xfs_dquot_dqalloc(ip);
1744
1745         xfs_iunlock(ip, lockflags);
1746         if (O_udqpp)
1747                 *O_udqpp = uq;
1748         else
1749                 xfs_qm_dqrele(uq);
1750         if (O_gdqpp)
1751                 *O_gdqpp = gq;
1752         else
1753                 xfs_qm_dqrele(gq);
1754         if (O_pdqpp)
1755                 *O_pdqpp = pq;
1756         else
1757                 xfs_qm_dqrele(pq);
1758         return 0;
1759
1760 error_rele:
1761         xfs_qm_dqrele(gq);
1762         xfs_qm_dqrele(uq);
1763         return error;
1764 }
1765
1766 /*
1767  * Actually transfer ownership, and do dquot modifications.
1768  * These were already reserved.
1769  */
1770 xfs_dquot_t *
1771 xfs_qm_vop_chown(
1772         xfs_trans_t     *tp,
1773         xfs_inode_t     *ip,
1774         xfs_dquot_t     **IO_olddq,
1775         xfs_dquot_t     *newdq)
1776 {
1777         xfs_dquot_t     *prevdq;
1778         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1779                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1780
1781
1782         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1783         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1784
1785         /* old dquot */
1786         prevdq = *IO_olddq;
1787         ASSERT(prevdq);
1788         ASSERT(prevdq != newdq);
1789
1790         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1791         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1792
1793         /* the sparkling new dquot */
1794         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1795         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1796
1797         /*
1798          * Take an extra reference, because the inode is going to keep
1799          * this dquot pointer even after the trans_commit.
1800          */
1801         *IO_olddq = xfs_qm_dqhold(newdq);
1802
1803         return prevdq;
1804 }
1805
1806 /*
1807  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1808  */
1809 int
1810 xfs_qm_vop_chown_reserve(
1811         struct xfs_trans        *tp,
1812         struct xfs_inode        *ip,
1813         struct xfs_dquot        *udqp,
1814         struct xfs_dquot        *gdqp,
1815         struct xfs_dquot        *pdqp,
1816         uint                    flags)
1817 {
1818         struct xfs_mount        *mp = ip->i_mount;
1819         uint                    delblks, blkflags, prjflags = 0;
1820         struct xfs_dquot        *udq_unres = NULL;
1821         struct xfs_dquot        *gdq_unres = NULL;
1822         struct xfs_dquot        *pdq_unres = NULL;
1823         struct xfs_dquot        *udq_delblks = NULL;
1824         struct xfs_dquot        *gdq_delblks = NULL;
1825         struct xfs_dquot        *pdq_delblks = NULL;
1826         int                     error;
1827
1828
1829         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1830         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1831
1832         delblks = ip->i_delayed_blks;
1833         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1834                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1835
1836         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1837             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1838                 udq_delblks = udqp;
1839                 /*
1840                  * If there are delayed allocation blocks, then we have to
1841                  * unreserve those from the old dquot, and add them to the
1842                  * new dquot.
1843                  */
1844                 if (delblks) {
1845                         ASSERT(ip->i_udquot);
1846                         udq_unres = ip->i_udquot;
1847                 }
1848         }
1849         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1850             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1851                 gdq_delblks = gdqp;
1852                 if (delblks) {
1853                         ASSERT(ip->i_gdquot);
1854                         gdq_unres = ip->i_gdquot;
1855                 }
1856         }
1857
1858         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1859             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1860                 prjflags = XFS_QMOPT_ENOSPC;
1861                 pdq_delblks = pdqp;
1862                 if (delblks) {
1863                         ASSERT(ip->i_pdquot);
1864                         pdq_unres = ip->i_pdquot;
1865                 }
1866         }
1867
1868         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1869                                 udq_delblks, gdq_delblks, pdq_delblks,
1870                                 ip->i_d.di_nblocks, 1,
1871                                 flags | blkflags | prjflags);
1872         if (error)
1873                 return error;
1874
1875         /*
1876          * Do the delayed blks reservations/unreservations now. Since, these
1877          * are done without the help of a transaction, if a reservation fails
1878          * its previous reservations won't be automatically undone by trans
1879          * code. So, we have to do it manually here.
1880          */
1881         if (delblks) {
1882                 /*
1883                  * Do the reservations first. Unreservation can't fail.
1884                  */
1885                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1886                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1887                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1888                             udq_delblks, gdq_delblks, pdq_delblks,
1889                             (xfs_qcnt_t)delblks, 0,
1890                             flags | blkflags | prjflags);
1891                 if (error)
1892                         return error;
1893                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1894                                 udq_unres, gdq_unres, pdq_unres,
1895                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1896         }
1897
1898         return 0;
1899 }
1900
1901 int
1902 xfs_qm_vop_rename_dqattach(
1903         struct xfs_inode        **i_tab)
1904 {
1905         struct xfs_mount        *mp = i_tab[0]->i_mount;
1906         int                     i;
1907
1908         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1909                 return 0;
1910
1911         for (i = 0; (i < 4 && i_tab[i]); i++) {
1912                 struct xfs_inode        *ip = i_tab[i];
1913                 int                     error;
1914
1915                 /*
1916                  * Watch out for duplicate entries in the table.
1917                  */
1918                 if (i == 0 || ip != i_tab[i-1]) {
1919                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1920                                 error = xfs_qm_dqattach(ip, 0);
1921                                 if (error)
1922                                         return error;
1923                         }
1924                 }
1925         }
1926         return 0;
1927 }
1928
1929 void
1930 xfs_qm_vop_create_dqattach(
1931         struct xfs_trans        *tp,
1932         struct xfs_inode        *ip,
1933         struct xfs_dquot        *udqp,
1934         struct xfs_dquot        *gdqp,
1935         struct xfs_dquot        *pdqp)
1936 {
1937         struct xfs_mount        *mp = tp->t_mountp;
1938
1939         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1940                 return;
1941
1942         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1943         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1944
1945         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1946                 ASSERT(ip->i_udquot == NULL);
1947                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1948
1949                 ip->i_udquot = xfs_qm_dqhold(udqp);
1950                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1951         }
1952         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1953                 ASSERT(ip->i_gdquot == NULL);
1954                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1955                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1956                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1957         }
1958         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1959                 ASSERT(ip->i_pdquot == NULL);
1960                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1961
1962                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1963                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1964         }
1965 }
1966