fs/xfs/xfs_qm.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_inode.h"
  28 #include "xfs_ialloc.h"
  29 #include "xfs_itable.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_error.h"
  32 #include "xfs_bmap.h"
  33 #include "xfs_bmap_btree.h"
  34 #include "xfs_bmap_util.h"
  35 #include "xfs_trans.h"
  36 #include "xfs_trans_space.h"
  37 #include "xfs_qm.h"
  38 #include "xfs_trace.h"
  39 #include "xfs_icache.h"
  40 #include "xfs_cksum.h"
  41
  42 /*
  43  * The global quota manager. There is only one of these for the entire
  44  * system, _not_ one per file system. XQM keeps track of the overall
  45  * quota functionality, including maintaining the freelist and hash
  46  * tables of dquots.
  47  */
  48 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  49 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  50
  51 STATIC void     xfs_qm_destroy_quotainos(xfs_quotainfo_t *qi);
  52 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  53 /*
  54  * We use the batch lookup interface to iterate over the dquots as it
  55  * currently is the only interface into the radix tree code that allows
  56  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  57  * operations is fine as all callers are used either during mount/umount
  58  * or quotaoff.
  59  */
  60 #define XFS_DQ_LOOKUP_BATCH     32
  61
  62 STATIC int
  63 xfs_qm_dquot_walk(
  64         struct xfs_mount        *mp,
  65         int                     type,
  66         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  67         void                    *data)
  68 {
  69         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  70         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  71         uint32_t                next_index;
  72         int                     last_error = 0;
  73         int                     skipped;
  74         int                     nr_found;
  75
  76 restart:
  77         skipped = 0;
  78         next_index = 0;
  79         nr_found = 0;
  80
  81         while (1) {
  82                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  83                 int             error = 0;
  84                 int             i;
  85
  86                 mutex_lock(&qi->qi_tree_lock);
  87                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  88                                         next_index, XFS_DQ_LOOKUP_BATCH);
  89                 if (!nr_found) {
  90                         mutex_unlock(&qi->qi_tree_lock);
  91                         break;
  92                 }
  93
  94                 for (i = 0; i < nr_found; i++) {
  95                         struct xfs_dquot *dqp = batch[i];
  96
  97                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  98
  99                         error = execute(batch[i], data);
 100                         if (error == -EAGAIN) {
 101                                 skipped++;
 102                                 continue;
 103                         }
 104                         if (error && last_error != -EFSCORRUPTED)
 105                                 last_error = error;
 106                 }
 107
 108                 mutex_unlock(&qi->qi_tree_lock);
 109
 110                 /* bail out if the filesystem is corrupted.  */
 111                 if (last_error == -EFSCORRUPTED) {
 112                         skipped = 0;
 113                         break;
 114                 }
 115                 /* we're done if id overflows back to zero */
 116                 if (!next_index)
 117                         break;
 118         }
 119
 120         if (skipped) {
 121                 delay(1);
 122                 goto restart;
 123         }
 124
 125         return last_error;
 126 }
 127
 128
 129 /*
 130  * Purge a dquot from all tracking data structures and free it.
 131  */
 132 STATIC int
 133 xfs_qm_dqpurge(
 134         struct xfs_dquot        *dqp,
 135         void                    *data)
 136 {
 137         struct xfs_mount        *mp = dqp->q_mount;
 138         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 139
 140         xfs_dqlock(dqp);
 141         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 142                 xfs_dqunlock(dqp);
 143                 return -EAGAIN;
 144         }
 145
 146         dqp->dq_flags |= XFS_DQ_FREEING;
 147
 148         xfs_dqflock(dqp);
 149
 150         /*
 151          * If we are turning this type of quotas off, we don't care
 152          * about the dirty metadata sitting in this dquot. OTOH, if
 153          * we're unmounting, we do care, so we flush it and wait.
 154          */
 155         if (XFS_DQ_IS_DIRTY(dqp)) {
 156                 struct xfs_buf  *bp = NULL;
 157                 int             error;
 158
 159                 /*
 160                  * We don't care about getting disk errors here. We need
 161                  * to purge this dquot anyway, so we go ahead regardless.
 162                  */
 163                 error = xfs_qm_dqflush(dqp, &bp);
 164                 if (error) {
 165                         xfs_warn(mp, "%s: dquot %p flush failed",
 166                                 __func__, dqp);
 167                 } else {
 168                         error = xfs_bwrite(bp);
 169                         xfs_buf_relse(bp);
 170                 }
 171                 xfs_dqflock(dqp);
 172         }
 173
 174         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 175         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 176                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 177
 178         xfs_dqfunlock(dqp);
 179         xfs_dqunlock(dqp);
 180
 181         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 182                           be32_to_cpu(dqp->q_core.d_id));
 183         qi->qi_dquots--;
 184
 185         /*
 186          * We move dquots to the freelist as soon as their reference count
 187          * hits zero, so it really should be on the freelist here.
 188          */
 189         ASSERT(!list_empty(&dqp->q_lru));
 190         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 191         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 192
 193         xfs_qm_dqdestroy(dqp);
 194         return 0;
 195 }
 196
 197 /*
 198  * Purge the dquot cache.
 199  */
 200 void
 201 xfs_qm_dqpurge_all(
 202         struct xfs_mount        *mp,
 203         uint                    flags)
 204 {
 205         if (flags & XFS_QMOPT_UQUOTA)
 206                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 207         if (flags & XFS_QMOPT_GQUOTA)
 208                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 209         if (flags & XFS_QMOPT_PQUOTA)
 210                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 211 }
 212
 213 /*
 214  * Just destroy the quotainfo structure.
 215  */
 216 void
 217 xfs_qm_unmount(
 218         struct xfs_mount        *mp)
 219 {
 220         if (mp->m_quotainfo) {
 221                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 222                 xfs_qm_destroy_quotainfo(mp);
 223         }
 224 }
 225
 226 /*
 227  * Called from the vfsops layer.
 228  */
 229 void
 230 xfs_qm_unmount_quotas(
 231         xfs_mount_t     *mp)
 232 {
 233         /*
 234          * Release the dquots that root inode, et al might be holding,
 235          * before we flush quotas and blow away the quotainfo structure.
 236          */
 237         ASSERT(mp->m_rootip);
 238         xfs_qm_dqdetach(mp->m_rootip);
 239         if (mp->m_rbmip)
 240                 xfs_qm_dqdetach(mp->m_rbmip);
 241         if (mp->m_rsumip)
 242                 xfs_qm_dqdetach(mp->m_rsumip);
 243
 244         /*
 245          * Release the quota inodes.
 246          */
 247         if (mp->m_quotainfo) {
 248                 if (mp->m_quotainfo->qi_uquotaip) {
 249                         IRELE(mp->m_quotainfo->qi_uquotaip);
 250                         mp->m_quotainfo->qi_uquotaip = NULL;
 251                 }
 252                 if (mp->m_quotainfo->qi_gquotaip) {
 253                         IRELE(mp->m_quotainfo->qi_gquotaip);
 254                         mp->m_quotainfo->qi_gquotaip = NULL;
 255                 }
 256                 if (mp->m_quotainfo->qi_pquotaip) {
 257                         IRELE(mp->m_quotainfo->qi_pquotaip);
 258                         mp->m_quotainfo->qi_pquotaip = NULL;
 259                 }
 260         }
 261 }
 262
 263 STATIC int
 264 xfs_qm_dqattach_one(
 265         xfs_inode_t     *ip,
 266         xfs_dqid_t      id,
 267         uint            type,
 268         uint            doalloc,
 269         xfs_dquot_t     **IO_idqpp)
 270 {
 271         xfs_dquot_t     *dqp;
 272         int             error;
 273
 274         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 275         error = 0;
 276
 277         /*
 278          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 279          * or &i_gdquot. This made the code look weird, but made the logic a lot
 280          * simpler.
 281          */
 282         dqp = *IO_idqpp;
 283         if (dqp) {
 284                 trace_xfs_dqattach_found(dqp);
 285                 return 0;
 286         }
 287
 288         /*
 289          * Find the dquot from somewhere. This bumps the reference count of
 290          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 291          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 292          * turned off suddenly.
 293          */
 294         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 295                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 296         if (error)
 297                 return error;
 298
 299         trace_xfs_dqattach_get(dqp);
 300
 301         /*
 302          * dqget may have dropped and re-acquired the ilock, but it guarantees
 303          * that the dquot returned is the one that should go in the inode.
 304          */
 305         *IO_idqpp = dqp;
 306         xfs_dqunlock(dqp);
 307         return 0;
 308 }
 309
 310 static bool
 311 xfs_qm_need_dqattach(
 312         struct xfs_inode        *ip)
 313 {
 314         struct xfs_mount        *mp = ip->i_mount;
 315
 316         if (!XFS_IS_QUOTA_RUNNING(mp))
 317                 return false;
 318         if (!XFS_IS_QUOTA_ON(mp))
 319                 return false;
 320         if (!XFS_NOT_DQATTACHED(mp, ip))
 321                 return false;
 322         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 323                 return false;
 324         return true;
 325 }
 326
 327 /*
 328  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 329  * into account.
 330  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 331  * Inode may get unlocked and relocked in here, and the caller must deal with
 332  * the consequences.
 333  */
 334 int
 335 xfs_qm_dqattach_locked(
 336         xfs_inode_t     *ip,
 337         uint            flags)
 338 {
 339         xfs_mount_t     *mp = ip->i_mount;
 340         int             error = 0;
 341
 342         if (!xfs_qm_need_dqattach(ip))
 343                 return 0;
 344
 345         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 346
 347         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 348                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 349                                                 flags & XFS_QMOPT_DQALLOC,
 350                                                 &ip->i_udquot);
 351                 if (error)
 352                         goto done;
 353                 ASSERT(ip->i_udquot);
 354         }
 355
 356         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 357                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 358                                                 flags & XFS_QMOPT_DQALLOC,
 359                                                 &ip->i_gdquot);
 360                 if (error)
 361                         goto done;
 362                 ASSERT(ip->i_gdquot);
 363         }
 364
 365         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 366                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 367                                                 flags & XFS_QMOPT_DQALLOC,
 368                                                 &ip->i_pdquot);
 369                 if (error)
 370                         goto done;
 371                 ASSERT(ip->i_pdquot);
 372         }
 373
 374 done:
 375         /*
 376          * Don't worry about the dquots that we may have attached before any
 377          * error - they'll get detached later if it has not already been done.
 378          */
 379         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 380         return error;
 381 }
 382
 383 int
 384 xfs_qm_dqattach(
 385         struct xfs_inode        *ip,
 386         uint                    flags)
 387 {
 388         int                     error;
 389
 390         if (!xfs_qm_need_dqattach(ip))
 391                 return 0;
 392
 393         xfs_ilock(ip, XFS_ILOCK_EXCL);
 394         error = xfs_qm_dqattach_locked(ip, flags);
 395         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 396
 397         return error;
 398 }
 399
 400 /*
 401  * Release dquots (and their references) if any.
 402  * The inode should be locked EXCL except when this's called by
 403  * xfs_ireclaim.
 404  */
 405 void
 406 xfs_qm_dqdetach(
 407         xfs_inode_t     *ip)
 408 {
 409         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 410                 return;
 411
 412         trace_xfs_dquot_dqdetach(ip);
 413
 414         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 415         if (ip->i_udquot) {
 416                 xfs_qm_dqrele(ip->i_udquot);
 417                 ip->i_udquot = NULL;
 418         }
 419         if (ip->i_gdquot) {
 420                 xfs_qm_dqrele(ip->i_gdquot);
 421                 ip->i_gdquot = NULL;
 422         }
 423         if (ip->i_pdquot) {
 424                 xfs_qm_dqrele(ip->i_pdquot);
 425                 ip->i_pdquot = NULL;
 426         }
 427 }
 428
 429 struct xfs_qm_isolate {
 430         struct list_head        buffers;
 431         struct list_head        dispose;
 432 };
 433
 434 static enum lru_status
 435 xfs_qm_dquot_isolate(
 436         struct list_head        *item,
 437         struct list_lru_one     *lru,
 438         spinlock_t              *lru_lock,
 439         void                    *arg)
 440                 __releases(lru_lock) __acquires(lru_lock)
 441 {
 442         struct xfs_dquot        *dqp = container_of(item,
 443                                                 struct xfs_dquot, q_lru);
 444         struct xfs_qm_isolate   *isol = arg;
 445
 446         if (!xfs_dqlock_nowait(dqp))
 447                 goto out_miss_busy;
 448
 449         /*
 450          * This dquot has acquired a reference in the meantime remove it from
 451          * the freelist and try again.
 452          */
 453         if (dqp->q_nrefs) {
 454                 xfs_dqunlock(dqp);
 455                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 456
 457                 trace_xfs_dqreclaim_want(dqp);
 458                 list_lru_isolate(lru, &dqp->q_lru);
 459                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 460                 return LRU_REMOVED;
 461         }
 462
 463         /*
 464          * If the dquot is dirty, flush it. If it's already being flushed, just
 465          * skip it so there is time for the IO to complete before we try to
 466          * reclaim it again on the next LRU pass.
 467          */
 468         if (!xfs_dqflock_nowait(dqp)) {
 469                 xfs_dqunlock(dqp);
 470                 goto out_miss_busy;
 471         }
 472
 473         if (XFS_DQ_IS_DIRTY(dqp)) {
 474                 struct xfs_buf  *bp = NULL;
 475                 int             error;
 476
 477                 trace_xfs_dqreclaim_dirty(dqp);
 478
 479                 /* we have to drop the LRU lock to flush the dquot */
 480                 spin_unlock(lru_lock);
 481
 482                 error = xfs_qm_dqflush(dqp, &bp);
 483                 if (error) {
 484                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 485                                  __func__, dqp);
 486                         goto out_unlock_dirty;
 487                 }
 488
 489                 xfs_buf_delwri_queue(bp, &isol->buffers);
 490                 xfs_buf_relse(bp);
 491                 goto out_unlock_dirty;
 492         }
 493         xfs_dqfunlock(dqp);
 494
 495         /*
 496          * Prevent lookups now that we are past the point of no return.
 497          */
 498         dqp->dq_flags |= XFS_DQ_FREEING;
 499         xfs_dqunlock(dqp);
 500
 501         ASSERT(dqp->q_nrefs == 0);
 502         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 503         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 504         trace_xfs_dqreclaim_done(dqp);
 505         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 506         return LRU_REMOVED;
 507
 508 out_miss_busy:
 509         trace_xfs_dqreclaim_busy(dqp);
 510         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 511         return LRU_SKIP;
 512
 513 out_unlock_dirty:
 514         trace_xfs_dqreclaim_busy(dqp);
 515         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 516         xfs_dqunlock(dqp);
 517         spin_lock(lru_lock);
 518         return LRU_RETRY;
 519 }
 520
 521 static unsigned long
 522 xfs_qm_shrink_scan(
 523         struct shrinker         *shrink,
 524         struct shrink_control   *sc)
 525 {
 526         struct xfs_quotainfo    *qi = container_of(shrink,
 527                                         struct xfs_quotainfo, qi_shrinker);
 528         struct xfs_qm_isolate   isol;
 529         unsigned long           freed;
 530         int                     error;
 531
 532         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 533                 return 0;
 534
 535         INIT_LIST_HEAD(&isol.buffers);
 536         INIT_LIST_HEAD(&isol.dispose);
 537
 538         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 539                                      xfs_qm_dquot_isolate, &isol);
 540
 541         error = xfs_buf_delwri_submit(&isol.buffers);
 542         if (error)
 543                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 544
 545         while (!list_empty(&isol.dispose)) {
 546                 struct xfs_dquot        *dqp;
 547
 548                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 549                 list_del_init(&dqp->q_lru);
 550                 xfs_qm_dqfree_one(dqp);
 551         }
 552
 553         return freed;
 554 }
 555
 556 static unsigned long
 557 xfs_qm_shrink_count(
 558         struct shrinker         *shrink,
 559         struct shrink_control   *sc)
 560 {
 561         struct xfs_quotainfo    *qi = container_of(shrink,
 562                                         struct xfs_quotainfo, qi_shrinker);
 563
 564         return list_lru_shrink_count(&qi->qi_lru, sc);
 565 }
 566
 567 STATIC void
 568 xfs_qm_set_defquota(
 569         xfs_mount_t     *mp,
 570         uint            type,
 571         xfs_quotainfo_t *qinf)
 572 {
 573         xfs_dquot_t             *dqp;
 574         struct xfs_def_quota    *defq;
 575         int                     error;
 576
 577         error = xfs_qm_dqread(mp, 0, type, XFS_QMOPT_DOWARN, &dqp);
 578
 579         if (!error) {
 580                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 581
 582                 defq = xfs_get_defquota(dqp, qinf);
 583
 584                 /*
 585                  * Timers and warnings have been already set, let's just set the
 586                  * default limits for this quota type
 587                  */
 588                 defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 589                 defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 590                 defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 591                 defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 592                 defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 593                 defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 594                 xfs_qm_dqdestroy(dqp);
 595         }
 596 }
 597
 598 /*
 599  * This initializes all the quota information that's kept in the
 600  * mount structure
 601  */
 602 STATIC int
 603 xfs_qm_init_quotainfo(
 604         xfs_mount_t     *mp)
 605 {
 606         xfs_quotainfo_t *qinf;
 607         int             error;
 608         xfs_dquot_t     *dqp;
 609
 610         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 611
 612         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 613
 614         error = list_lru_init(&qinf->qi_lru);
 615         if (error)
 616                 goto out_free_qinf;
 617
 618         /*
 619          * See if quotainodes are setup, and if not, allocate them,
 620          * and change the superblock accordingly.
 621          */
 622         error = xfs_qm_init_quotainos(mp);
 623         if (error)
 624                 goto out_free_lru;
 625
 626         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 627         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 628         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 629         mutex_init(&qinf->qi_tree_lock);
 630
 631         /* mutex used to serialize quotaoffs */
 632         mutex_init(&qinf->qi_quotaofflock);
 633
 634         /* Precalc some constants */
 635         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 636         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 637
 638         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 639
 640         /*
 641          * We try to get the limits from the superuser's limits fields.
 642          * This is quite hacky, but it is standard quota practice.
 643          *
 644          * Since we may not have done a quotacheck by this point, just read
 645          * the dquot without attaching it to any hashtables or lists.
 646          *
 647          * Timers and warnings are globally set by the first timer found in
 648          * user/group/proj quota types, otherwise a default value is used.
 649          * This should be split into different fields per quota type.
 650          */
 651         error = xfs_qm_dqread(mp, 0,
 652                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 653                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 654                           XFS_DQ_PROJ),
 655                         XFS_QMOPT_DOWARN, &dqp);
 656
 657         if (!error) {
 658                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 659
 660                 /*
 661                  * The warnings and timers set the grace period given to
 662                  * a user or group before he or she can not perform any
 663                  * more writing. If it is zero, a default is used.
 664                  */
 665                 qinf->qi_btimelimit = ddqp->d_btimer ?
 666                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 667                 qinf->qi_itimelimit = ddqp->d_itimer ?
 668                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 669                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 670                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 671                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 672                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 673                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 674                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 675                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 676                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 677                 xfs_qm_dqdestroy(dqp);
 678         } else {
 679                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 680                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 681                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 682                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 683                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 684                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 685         }
 686
 687         if (XFS_IS_UQUOTA_RUNNING(mp))
 688                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 689         if (XFS_IS_GQUOTA_RUNNING(mp))
 690                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 691         if (XFS_IS_PQUOTA_RUNNING(mp))
 692                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 693
 694         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 695         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 696         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 697         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 698
 699         error = register_shrinker(&qinf->qi_shrinker);
 700         if (error)
 701                 goto out_free_inos;
 702
 703         return 0;
 704
 705 out_free_inos:
 706         mutex_destroy(&qinf->qi_quotaofflock);
 707         mutex_destroy(&qinf->qi_tree_lock);
 708         xfs_qm_destroy_quotainos(qinf);
 709 out_free_lru:
 710         list_lru_destroy(&qinf->qi_lru);
 711 out_free_qinf:
 712         kmem_free(qinf);
 713         mp->m_quotainfo = NULL;
 714         return error;
 715 }
 716
 717 /*
 718  * Gets called when unmounting a filesystem or when all quotas get
 719  * turned off.
 720  * This purges the quota inodes, destroys locks and frees itself.
 721  */
 722 void
 723 xfs_qm_destroy_quotainfo(
 724         xfs_mount_t     *mp)
 725 {
 726         xfs_quotainfo_t *qi;
 727
 728         qi = mp->m_quotainfo;
 729         ASSERT(qi != NULL);
 730
 731         unregister_shrinker(&qi->qi_shrinker);
 732         list_lru_destroy(&qi->qi_lru);
 733         xfs_qm_destroy_quotainos(qi);
 734         mutex_destroy(&qi->qi_tree_lock);
 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 = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 855                 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 /*
1121  * callback routine supplied to bulkstat(). Given an inumber, find its
1122  * dquots and update them to account for resources taken by that inode.
1123  */
1124 /* ARGSUSED */
1125 STATIC int
1126 xfs_qm_dqusage_adjust(
1127         xfs_mount_t     *mp,            /* mount point for filesystem */
1128         xfs_ino_t       ino,            /* inode number to get data for */
1129         void            __user *buffer, /* not used */
1130         int             ubsize,         /* not used */
1131         int             *ubused,        /* not used */
1132         int             *res)           /* result code value */
1133 {
1134         xfs_inode_t     *ip;
1135         xfs_qcnt_t      nblks;
1136         xfs_filblks_t   rtblks = 0;     /* total rt blks */
1137         int             error;
1138
1139         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1140
1141         /*
1142          * rootino must have its resources accounted for, not so with the quota
1143          * inodes.
1144          */
1145         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1146                 *res = BULKSTAT_RV_NOTHING;
1147                 return -EINVAL;
1148         }
1149
1150         /*
1151          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1152          * interface expects the inode to be exclusively locked because that's
1153          * the case in all other instances. It's OK that we do this because
1154          * quotacheck is done only at mount time.
1155          */
1156         error = xfs_iget(mp, NULL, ino, XFS_IGET_DONTCACHE, XFS_ILOCK_EXCL,
1157                          &ip);
1158         if (error) {
1159                 *res = BULKSTAT_RV_NOTHING;
1160                 return error;
1161         }
1162
1163         ASSERT(ip->i_delayed_blks == 0);
1164
1165         if (XFS_IS_REALTIME_INODE(ip)) {
1166                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1167
1168                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1169                         error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1170                         if (error)
1171                                 goto error0;
1172                 }
1173
1174                 xfs_bmap_count_leaves(ifp, &rtblks);
1175         }
1176
1177         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1178
1179         /*
1180          * Add the (disk blocks and inode) resources occupied by this
1181          * inode to its dquots. We do this adjustment in the incore dquot,
1182          * and also copy the changes to its buffer.
1183          * We don't care about putting these changes in a transaction
1184          * envelope because if we crash in the middle of a 'quotacheck'
1185          * we have to start from the beginning anyway.
1186          * Once we're done, we'll log all the dquot bufs.
1187          *
1188          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1189          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1190          */
1191         if (XFS_IS_UQUOTA_ON(mp)) {
1192                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1193                                                    XFS_DQ_USER, nblks, rtblks);
1194                 if (error)
1195                         goto error0;
1196         }
1197
1198         if (XFS_IS_GQUOTA_ON(mp)) {
1199                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1200                                                    XFS_DQ_GROUP, nblks, rtblks);
1201                 if (error)
1202                         goto error0;
1203         }
1204
1205         if (XFS_IS_PQUOTA_ON(mp)) {
1206                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1207                                                    XFS_DQ_PROJ, nblks, rtblks);
1208                 if (error)
1209                         goto error0;
1210         }
1211
1212         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1213         IRELE(ip);
1214         *res = BULKSTAT_RV_DIDONE;
1215         return 0;
1216
1217 error0:
1218         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1219         IRELE(ip);
1220         *res = BULKSTAT_RV_GIVEUP;
1221         return error;
1222 }
1223
1224 STATIC int
1225 xfs_qm_flush_one(
1226         struct xfs_dquot        *dqp,
1227         void                    *data)
1228 {
1229         struct xfs_mount        *mp = dqp->q_mount;
1230         struct list_head        *buffer_list = data;
1231         struct xfs_buf          *bp = NULL;
1232         int                     error = 0;
1233
1234         xfs_dqlock(dqp);
1235         if (dqp->dq_flags & XFS_DQ_FREEING)
1236                 goto out_unlock;
1237         if (!XFS_DQ_IS_DIRTY(dqp))
1238                 goto out_unlock;
1239
1240         /*
1241          * The only way the dquot is already flush locked by the time quotacheck
1242          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1243          * it for the final time. Quotacheck collects all dquot bufs in the
1244          * local delwri queue before dquots are dirtied, so reclaim can't have
1245          * possibly queued it for I/O. The only way out is to push the buffer to
1246          * cycle the flush lock.
1247          */
1248         if (!xfs_dqflock_nowait(dqp)) {
1249                 /* buf is pinned in-core by delwri list */
1250                 DEFINE_SINGLE_BUF_MAP(map, dqp->q_blkno,
1251                                       mp->m_quotainfo->qi_dqchunklen);
1252                 bp = _xfs_buf_find(mp->m_ddev_targp, &map, 1, 0, NULL);
1253                 if (!bp) {
1254                         error = -EINVAL;
1255                         goto out_unlock;
1256                 }
1257                 xfs_buf_unlock(bp);
1258
1259                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1260                 xfs_buf_rele(bp);
1261
1262                 error = -EAGAIN;
1263                 goto out_unlock;
1264         }
1265
1266         error = xfs_qm_dqflush(dqp, &bp);
1267         if (error)
1268                 goto out_unlock;
1269
1270         xfs_buf_delwri_queue(bp, buffer_list);
1271         xfs_buf_relse(bp);
1272 out_unlock:
1273         xfs_dqunlock(dqp);
1274         return error;
1275 }
1276
1277 /*
1278  * Walk thru all the filesystem inodes and construct a consistent view
1279  * of the disk quota world. If the quotacheck fails, disable quotas.
1280  */
1281 STATIC int
1282 xfs_qm_quotacheck(
1283         xfs_mount_t     *mp)
1284 {
1285         int                     done, count, error, error2;
1286         xfs_ino_t               lastino;
1287         size_t                  structsz;
1288         uint                    flags;
1289         LIST_HEAD               (buffer_list);
1290         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1291         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1292         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1293
1294         count = INT_MAX;
1295         structsz = 1;
1296         lastino = 0;
1297         flags = 0;
1298
1299         ASSERT(uip || gip || pip);
1300         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1301
1302         xfs_notice(mp, "Quotacheck needed: Please wait.");
1303
1304         /*
1305          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1306          * their counters to zero. We need a clean slate.
1307          * We don't log our changes till later.
1308          */
1309         if (uip) {
1310                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1311                                          &buffer_list);
1312                 if (error)
1313                         goto error_return;
1314                 flags |= XFS_UQUOTA_CHKD;
1315         }
1316
1317         if (gip) {
1318                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1319                                          &buffer_list);
1320                 if (error)
1321                         goto error_return;
1322                 flags |= XFS_GQUOTA_CHKD;
1323         }
1324
1325         if (pip) {
1326                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1327                                          &buffer_list);
1328                 if (error)
1329                         goto error_return;
1330                 flags |= XFS_PQUOTA_CHKD;
1331         }
1332
1333         do {
1334                 /*
1335                  * Iterate thru all the inodes in the file system,
1336                  * adjusting the corresponding dquot counters in core.
1337                  */
1338                 error = xfs_bulkstat(mp, &lastino, &count,
1339                                      xfs_qm_dqusage_adjust,
1340                                      structsz, NULL, &done);
1341                 if (error)
1342                         break;
1343
1344         } while (!done);
1345
1346         /*
1347          * We've made all the changes that we need to make incore.  Flush them
1348          * down to disk buffers if everything was updated successfully.
1349          */
1350         if (XFS_IS_UQUOTA_ON(mp)) {
1351                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1352                                           &buffer_list);
1353         }
1354         if (XFS_IS_GQUOTA_ON(mp)) {
1355                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1356                                            &buffer_list);
1357                 if (!error)
1358                         error = error2;
1359         }
1360         if (XFS_IS_PQUOTA_ON(mp)) {
1361                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1362                                            &buffer_list);
1363                 if (!error)
1364                         error = error2;
1365         }
1366
1367         error2 = xfs_buf_delwri_submit(&buffer_list);
1368         if (!error)
1369                 error = error2;
1370
1371         /*
1372          * We can get this error if we couldn't do a dquot allocation inside
1373          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1374          * dirty dquots that might be cached, we just want to get rid of them
1375          * and turn quotaoff. The dquots won't be attached to any of the inodes
1376          * at this point (because we intentionally didn't in dqget_noattach).
1377          */
1378         if (error) {
1379                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1380                 goto error_return;
1381         }
1382
1383         /*
1384          * If one type of quotas is off, then it will lose its
1385          * quotachecked status, since we won't be doing accounting for
1386          * that type anymore.
1387          */
1388         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1389         mp->m_qflags |= flags;
1390
1391  error_return:
1392         xfs_buf_delwri_cancel(&buffer_list);
1393
1394         if (error) {
1395                 xfs_warn(mp,
1396         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1397                         error);
1398                 /*
1399                  * We must turn off quotas.
1400                  */
1401                 ASSERT(mp->m_quotainfo != NULL);
1402                 xfs_qm_destroy_quotainfo(mp);
1403                 if (xfs_mount_reset_sbqflags(mp)) {
1404                         xfs_warn(mp,
1405                                 "Quotacheck: Failed to reset quota flags.");
1406                 }
1407         } else
1408                 xfs_notice(mp, "Quotacheck: Done.");
1409         return error;
1410 }
1411
1412 /*
1413  * This is called from xfs_mountfs to start quotas and initialize all
1414  * necessary data structures like quotainfo.  This is also responsible for
1415  * running a quotacheck as necessary.  We are guaranteed that the superblock
1416  * is consistently read in at this point.
1417  *
1418  * If we fail here, the mount will continue with quota turned off. We don't
1419  * need to inidicate success or failure at all.
1420  */
1421 void
1422 xfs_qm_mount_quotas(
1423         struct xfs_mount        *mp)
1424 {
1425         int                     error = 0;
1426         uint                    sbf;
1427
1428         /*
1429          * If quotas on realtime volumes is not supported, we disable
1430          * quotas immediately.
1431          */
1432         if (mp->m_sb.sb_rextents) {
1433                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1434                 mp->m_qflags = 0;
1435                 goto write_changes;
1436         }
1437
1438         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1439
1440         /*
1441          * Allocate the quotainfo structure inside the mount struct, and
1442          * create quotainode(s), and change/rev superblock if necessary.
1443          */
1444         error = xfs_qm_init_quotainfo(mp);
1445         if (error) {
1446                 /*
1447                  * We must turn off quotas.
1448                  */
1449                 ASSERT(mp->m_quotainfo == NULL);
1450                 mp->m_qflags = 0;
1451                 goto write_changes;
1452         }
1453         /*
1454          * If any of the quotas are not consistent, do a quotacheck.
1455          */
1456         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1457                 error = xfs_qm_quotacheck(mp);
1458                 if (error) {
1459                         /* Quotacheck failed and disabled quotas. */
1460                         return;
1461                 }
1462         }
1463         /*
1464          * If one type of quotas is off, then it will lose its
1465          * quotachecked status, since we won't be doing accounting for
1466          * that type anymore.
1467          */
1468         if (!XFS_IS_UQUOTA_ON(mp))
1469                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1470         if (!XFS_IS_GQUOTA_ON(mp))
1471                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1472         if (!XFS_IS_PQUOTA_ON(mp))
1473                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1474
1475  write_changes:
1476         /*
1477          * We actually don't have to acquire the m_sb_lock at all.
1478          * This can only be called from mount, and that's single threaded. XXX
1479          */
1480         spin_lock(&mp->m_sb_lock);
1481         sbf = mp->m_sb.sb_qflags;
1482         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1483         spin_unlock(&mp->m_sb_lock);
1484
1485         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1486                 if (xfs_sync_sb(mp, false)) {
1487                         /*
1488                          * We could only have been turning quotas off.
1489                          * We aren't in very good shape actually because
1490                          * the incore structures are convinced that quotas are
1491                          * off, but the on disk superblock doesn't know that !
1492                          */
1493                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1494                         xfs_alert(mp, "%s: Superblock update failed!",
1495                                 __func__);
1496                 }
1497         }
1498
1499         if (error) {
1500                 xfs_warn(mp, "Failed to initialize disk quotas.");
1501                 return;
1502         }
1503 }
1504
1505 /*
1506  * This is called after the superblock has been read in and we're ready to
1507  * iget the quota inodes.
1508  */
1509 STATIC int
1510 xfs_qm_init_quotainos(
1511         xfs_mount_t     *mp)
1512 {
1513         struct xfs_inode        *uip = NULL;
1514         struct xfs_inode        *gip = NULL;
1515         struct xfs_inode        *pip = NULL;
1516         int                     error;
1517         uint                    flags = 0;
1518
1519         ASSERT(mp->m_quotainfo);
1520
1521         /*
1522          * Get the uquota and gquota inodes
1523          */
1524         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1525                 if (XFS_IS_UQUOTA_ON(mp) &&
1526                     mp->m_sb.sb_uquotino != NULLFSINO) {
1527                         ASSERT(mp->m_sb.sb_uquotino > 0);
1528                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1529                                              0, 0, &uip);
1530                         if (error)
1531                                 return error;
1532                 }
1533                 if (XFS_IS_GQUOTA_ON(mp) &&
1534                     mp->m_sb.sb_gquotino != NULLFSINO) {
1535                         ASSERT(mp->m_sb.sb_gquotino > 0);
1536                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1537                                              0, 0, &gip);
1538                         if (error)
1539                                 goto error_rele;
1540                 }
1541                 if (XFS_IS_PQUOTA_ON(mp) &&
1542                     mp->m_sb.sb_pquotino != NULLFSINO) {
1543                         ASSERT(mp->m_sb.sb_pquotino > 0);
1544                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1545                                              0, 0, &pip);
1546                         if (error)
1547                                 goto error_rele;
1548                 }
1549         } else {
1550                 flags |= XFS_QMOPT_SBVERSION;
1551         }
1552
1553         /*
1554          * Create the three inodes, if they don't exist already. The changes
1555          * made above will get added to a transaction and logged in one of
1556          * the qino_alloc calls below.  If the device is readonly,
1557          * temporarily switch to read-write to do this.
1558          */
1559         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1560                 error = xfs_qm_qino_alloc(mp, &uip,
1561                                               flags | XFS_QMOPT_UQUOTA);
1562                 if (error)
1563                         goto error_rele;
1564
1565                 flags &= ~XFS_QMOPT_SBVERSION;
1566         }
1567         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1568                 error = xfs_qm_qino_alloc(mp, &gip,
1569                                           flags | XFS_QMOPT_GQUOTA);
1570                 if (error)
1571                         goto error_rele;
1572
1573                 flags &= ~XFS_QMOPT_SBVERSION;
1574         }
1575         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1576                 error = xfs_qm_qino_alloc(mp, &pip,
1577                                           flags | XFS_QMOPT_PQUOTA);
1578                 if (error)
1579                         goto error_rele;
1580         }
1581
1582         mp->m_quotainfo->qi_uquotaip = uip;
1583         mp->m_quotainfo->qi_gquotaip = gip;
1584         mp->m_quotainfo->qi_pquotaip = pip;
1585
1586         return 0;
1587
1588 error_rele:
1589         if (uip)
1590                 IRELE(uip);
1591         if (gip)
1592                 IRELE(gip);
1593         if (pip)
1594                 IRELE(pip);
1595         return error;
1596 }
1597
1598 STATIC void
1599 xfs_qm_destroy_quotainos(
1600         xfs_quotainfo_t *qi)
1601 {
1602         if (qi->qi_uquotaip) {
1603                 IRELE(qi->qi_uquotaip);
1604                 qi->qi_uquotaip = NULL; /* paranoia */
1605         }
1606         if (qi->qi_gquotaip) {
1607                 IRELE(qi->qi_gquotaip);
1608                 qi->qi_gquotaip = NULL;
1609         }
1610         if (qi->qi_pquotaip) {
1611                 IRELE(qi->qi_pquotaip);
1612                 qi->qi_pquotaip = NULL;
1613         }
1614 }
1615
1616 STATIC void
1617 xfs_qm_dqfree_one(
1618         struct xfs_dquot        *dqp)
1619 {
1620         struct xfs_mount        *mp = dqp->q_mount;
1621         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1622
1623         mutex_lock(&qi->qi_tree_lock);
1624         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1625                           be32_to_cpu(dqp->q_core.d_id));
1626
1627         qi->qi_dquots--;
1628         mutex_unlock(&qi->qi_tree_lock);
1629
1630         xfs_qm_dqdestroy(dqp);
1631 }
1632
1633 /* --------------- utility functions for vnodeops ---------------- */
1634
1635
1636 /*
1637  * Given an inode, a uid, gid and prid make sure that we have
1638  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1639  * quotas by creating this file.
1640  * This also attaches dquot(s) to the given inode after locking it,
1641  * and returns the dquots corresponding to the uid and/or gid.
1642  *
1643  * in   : inode (unlocked)
1644  * out  : udquot, gdquot with references taken and unlocked
1645  */
1646 int
1647 xfs_qm_vop_dqalloc(
1648         struct xfs_inode        *ip,
1649         xfs_dqid_t              uid,
1650         xfs_dqid_t              gid,
1651         prid_t                  prid,
1652         uint                    flags,
1653         struct xfs_dquot        **O_udqpp,
1654         struct xfs_dquot        **O_gdqpp,
1655         struct xfs_dquot        **O_pdqpp)
1656 {
1657         struct xfs_mount        *mp = ip->i_mount;
1658         struct xfs_dquot        *uq = NULL;
1659         struct xfs_dquot        *gq = NULL;
1660         struct xfs_dquot        *pq = NULL;
1661         int                     error;
1662         uint                    lockflags;
1663
1664         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1665                 return 0;
1666
1667         lockflags = XFS_ILOCK_EXCL;
1668         xfs_ilock(ip, lockflags);
1669
1670         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1671                 gid = ip->i_d.di_gid;
1672
1673         /*
1674          * Attach the dquot(s) to this inode, doing a dquot allocation
1675          * if necessary. The dquot(s) will not be locked.
1676          */
1677         if (XFS_NOT_DQATTACHED(mp, ip)) {
1678                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1679                 if (error) {
1680                         xfs_iunlock(ip, lockflags);
1681                         return error;
1682                 }
1683         }
1684
1685         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1686                 if (ip->i_d.di_uid != uid) {
1687                         /*
1688                          * What we need is the dquot that has this uid, and
1689                          * if we send the inode to dqget, the uid of the inode
1690                          * takes priority over what's sent in the uid argument.
1691                          * We must unlock inode here before calling dqget if
1692                          * we're not sending the inode, because otherwise
1693                          * we'll deadlock by doing trans_reserve while
1694                          * holding ilock.
1695                          */
1696                         xfs_iunlock(ip, lockflags);
1697                         error = xfs_qm_dqget(mp, NULL, uid,
1698                                                  XFS_DQ_USER,
1699                                                  XFS_QMOPT_DQALLOC |
1700                                                  XFS_QMOPT_DOWARN,
1701                                                  &uq);
1702                         if (error) {
1703                                 ASSERT(error != -ENOENT);
1704                                 return error;
1705                         }
1706                         /*
1707                          * Get the ilock in the right order.
1708                          */
1709                         xfs_dqunlock(uq);
1710                         lockflags = XFS_ILOCK_SHARED;
1711                         xfs_ilock(ip, lockflags);
1712                 } else {
1713                         /*
1714                          * Take an extra reference, because we'll return
1715                          * this to caller
1716                          */
1717                         ASSERT(ip->i_udquot);
1718                         uq = xfs_qm_dqhold(ip->i_udquot);
1719                 }
1720         }
1721         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1722                 if (ip->i_d.di_gid != gid) {
1723                         xfs_iunlock(ip, lockflags);
1724                         error = xfs_qm_dqget(mp, NULL, gid,
1725                                                  XFS_DQ_GROUP,
1726                                                  XFS_QMOPT_DQALLOC |
1727                                                  XFS_QMOPT_DOWARN,
1728                                                  &gq);
1729                         if (error) {
1730                                 ASSERT(error != -ENOENT);
1731                                 goto error_rele;
1732                         }
1733                         xfs_dqunlock(gq);
1734                         lockflags = XFS_ILOCK_SHARED;
1735                         xfs_ilock(ip, lockflags);
1736                 } else {
1737                         ASSERT(ip->i_gdquot);
1738                         gq = xfs_qm_dqhold(ip->i_gdquot);
1739                 }
1740         }
1741         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1742                 if (xfs_get_projid(ip) != prid) {
1743                         xfs_iunlock(ip, lockflags);
1744                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1745                                                  XFS_DQ_PROJ,
1746                                                  XFS_QMOPT_DQALLOC |
1747                                                  XFS_QMOPT_DOWARN,
1748                                                  &pq);
1749                         if (error) {
1750                                 ASSERT(error != -ENOENT);
1751                                 goto error_rele;
1752                         }
1753                         xfs_dqunlock(pq);
1754                         lockflags = XFS_ILOCK_SHARED;
1755                         xfs_ilock(ip, lockflags);
1756                 } else {
1757                         ASSERT(ip->i_pdquot);
1758                         pq = xfs_qm_dqhold(ip->i_pdquot);
1759                 }
1760         }
1761         if (uq)
1762                 trace_xfs_dquot_dqalloc(ip);
1763
1764         xfs_iunlock(ip, lockflags);
1765         if (O_udqpp)
1766                 *O_udqpp = uq;
1767         else
1768                 xfs_qm_dqrele(uq);
1769         if (O_gdqpp)
1770                 *O_gdqpp = gq;
1771         else
1772                 xfs_qm_dqrele(gq);
1773         if (O_pdqpp)
1774                 *O_pdqpp = pq;
1775         else
1776                 xfs_qm_dqrele(pq);
1777         return 0;
1778
1779 error_rele:
1780         xfs_qm_dqrele(gq);
1781         xfs_qm_dqrele(uq);
1782         return error;
1783 }
1784
1785 /*
1786  * Actually transfer ownership, and do dquot modifications.
1787  * These were already reserved.
1788  */
1789 xfs_dquot_t *
1790 xfs_qm_vop_chown(
1791         xfs_trans_t     *tp,
1792         xfs_inode_t     *ip,
1793         xfs_dquot_t     **IO_olddq,
1794         xfs_dquot_t     *newdq)
1795 {
1796         xfs_dquot_t     *prevdq;
1797         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1798                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1799
1800
1801         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1802         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1803
1804         /* old dquot */
1805         prevdq = *IO_olddq;
1806         ASSERT(prevdq);
1807         ASSERT(prevdq != newdq);
1808
1809         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1810         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1811
1812         /* the sparkling new dquot */
1813         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1814         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1815
1816         /*
1817          * Take an extra reference, because the inode is going to keep
1818          * this dquot pointer even after the trans_commit.
1819          */
1820         *IO_olddq = xfs_qm_dqhold(newdq);
1821
1822         return prevdq;
1823 }
1824
1825 /*
1826  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1827  */
1828 int
1829 xfs_qm_vop_chown_reserve(
1830         struct xfs_trans        *tp,
1831         struct xfs_inode        *ip,
1832         struct xfs_dquot        *udqp,
1833         struct xfs_dquot        *gdqp,
1834         struct xfs_dquot        *pdqp,
1835         uint                    flags)
1836 {
1837         struct xfs_mount        *mp = ip->i_mount;
1838         uint                    delblks, blkflags, prjflags = 0;
1839         struct xfs_dquot        *udq_unres = NULL;
1840         struct xfs_dquot        *gdq_unres = NULL;
1841         struct xfs_dquot        *pdq_unres = NULL;
1842         struct xfs_dquot        *udq_delblks = NULL;
1843         struct xfs_dquot        *gdq_delblks = NULL;
1844         struct xfs_dquot        *pdq_delblks = NULL;
1845         int                     error;
1846
1847
1848         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1849         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1850
1851         delblks = ip->i_delayed_blks;
1852         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1853                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1854
1855         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1856             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1857                 udq_delblks = udqp;
1858                 /*
1859                  * If there are delayed allocation blocks, then we have to
1860                  * unreserve those from the old dquot, and add them to the
1861                  * new dquot.
1862                  */
1863                 if (delblks) {
1864                         ASSERT(ip->i_udquot);
1865                         udq_unres = ip->i_udquot;
1866                 }
1867         }
1868         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1869             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1870                 gdq_delblks = gdqp;
1871                 if (delblks) {
1872                         ASSERT(ip->i_gdquot);
1873                         gdq_unres = ip->i_gdquot;
1874                 }
1875         }
1876
1877         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1878             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1879                 prjflags = XFS_QMOPT_ENOSPC;
1880                 pdq_delblks = pdqp;
1881                 if (delblks) {
1882                         ASSERT(ip->i_pdquot);
1883                         pdq_unres = ip->i_pdquot;
1884                 }
1885         }
1886
1887         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1888                                 udq_delblks, gdq_delblks, pdq_delblks,
1889                                 ip->i_d.di_nblocks, 1,
1890                                 flags | blkflags | prjflags);
1891         if (error)
1892                 return error;
1893
1894         /*
1895          * Do the delayed blks reservations/unreservations now. Since, these
1896          * are done without the help of a transaction, if a reservation fails
1897          * its previous reservations won't be automatically undone by trans
1898          * code. So, we have to do it manually here.
1899          */
1900         if (delblks) {
1901                 /*
1902                  * Do the reservations first. Unreservation can't fail.
1903                  */
1904                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1905                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1906                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1907                             udq_delblks, gdq_delblks, pdq_delblks,
1908                             (xfs_qcnt_t)delblks, 0,
1909                             flags | blkflags | prjflags);
1910                 if (error)
1911                         return error;
1912                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1913                                 udq_unres, gdq_unres, pdq_unres,
1914                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1915         }
1916
1917         return 0;
1918 }
1919
1920 int
1921 xfs_qm_vop_rename_dqattach(
1922         struct xfs_inode        **i_tab)
1923 {
1924         struct xfs_mount        *mp = i_tab[0]->i_mount;
1925         int                     i;
1926
1927         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1928                 return 0;
1929
1930         for (i = 0; (i < 4 && i_tab[i]); i++) {
1931                 struct xfs_inode        *ip = i_tab[i];
1932                 int                     error;
1933
1934                 /*
1935                  * Watch out for duplicate entries in the table.
1936                  */
1937                 if (i == 0 || ip != i_tab[i-1]) {
1938                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1939                                 error = xfs_qm_dqattach(ip, 0);
1940                                 if (error)
1941                                         return error;
1942                         }
1943                 }
1944         }
1945         return 0;
1946 }
1947
1948 void
1949 xfs_qm_vop_create_dqattach(
1950         struct xfs_trans        *tp,
1951         struct xfs_inode        *ip,
1952         struct xfs_dquot        *udqp,
1953         struct xfs_dquot        *gdqp,
1954         struct xfs_dquot        *pdqp)
1955 {
1956         struct xfs_mount        *mp = tp->t_mountp;
1957
1958         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1959                 return;
1960
1961         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1962         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1963
1964         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1965                 ASSERT(ip->i_udquot == NULL);
1966                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1967
1968                 ip->i_udquot = xfs_qm_dqhold(udqp);
1969                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1970         }
1971         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1972                 ASSERT(ip->i_gdquot == NULL);
1973                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1974                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1975                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1976         }
1977         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1978                 ASSERT(ip->i_pdquot == NULL);
1979                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1980
1981                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1982                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1983         }
1984 }
1985