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(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(xs_qm_dqwants);
 452
 453                 trace_xfs_dqreclaim_want(dqp);
 454                 list_lru_isolate(lru, &dqp->q_lru);
 455                 XFS_STATS_DEC(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(xs_qm_dquot_unused);
 500         trace_xfs_dqreclaim_done(dqp);
 501         XFS_STATS_INC(xs_qm_dqreclaims);
 502         return LRU_REMOVED;
 503
 504 out_miss_busy:
 505         trace_xfs_dqreclaim_busy(dqp);
 506         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 507         return LRU_SKIP;
 508
 509 out_unlock_dirty:
 510         trace_xfs_dqreclaim_busy(dqp);
 511         XFS_STATS_INC(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_WAIT)) != (__GFP_FS|__GFP_WAIT))
 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 /*
 564  * This initializes all the quota information that's kept in the
 565  * mount structure
 566  */
 567 STATIC int
 568 xfs_qm_init_quotainfo(
 569         xfs_mount_t     *mp)
 570 {
 571         xfs_quotainfo_t *qinf;
 572         int             error;
 573         xfs_dquot_t     *dqp;
 574
 575         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 576
 577         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 578
 579         error = list_lru_init(&qinf->qi_lru);
 580         if (error)
 581                 goto out_free_qinf;
 582
 583         /*
 584          * See if quotainodes are setup, and if not, allocate them,
 585          * and change the superblock accordingly.
 586          */
 587         error = xfs_qm_init_quotainos(mp);
 588         if (error)
 589                 goto out_free_lru;
 590
 591         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 592         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 593         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 594         mutex_init(&qinf->qi_tree_lock);
 595
 596         /* mutex used to serialize quotaoffs */
 597         mutex_init(&qinf->qi_quotaofflock);
 598
 599         /* Precalc some constants */
 600         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 601         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 602
 603         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 604
 605         /*
 606          * We try to get the limits from the superuser's limits fields.
 607          * This is quite hacky, but it is standard quota practice.
 608          *
 609          * We look at the USR dquot with id == 0 first, but if user quotas
 610          * are not enabled we goto the GRP dquot with id == 0.
 611          * We don't really care to keep separate default limits for user
 612          * and group quotas, at least not at this point.
 613          *
 614          * Since we may not have done a quotacheck by this point, just read
 615          * the dquot without attaching it to any hashtables or lists.
 616          */
 617         error = xfs_qm_dqread(mp, 0,
 618                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 619                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 620                           XFS_DQ_PROJ),
 621                         XFS_QMOPT_DOWARN, &dqp);
 622         if (!error) {
 623                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 624
 625                 /*
 626                  * The warnings and timers set the grace period given to
 627                  * a user or group before he or she can not perform any
 628                  * more writing. If it is zero, a default is used.
 629                  */
 630                 qinf->qi_btimelimit = ddqp->d_btimer ?
 631                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 632                 qinf->qi_itimelimit = ddqp->d_itimer ?
 633                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 634                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 635                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 636                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 637                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 638                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 639                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 640                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 641                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 642                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 643                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 644                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 645                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 646                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 647                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 648
 649                 xfs_qm_dqdestroy(dqp);
 650         } else {
 651                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 652                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 653                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 654                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 655                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 656                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 657         }
 658
 659         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 660         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 661         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 662         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 663         register_shrinker(&qinf->qi_shrinker);
 664         return 0;
 665
 666 out_free_lru:
 667         list_lru_destroy(&qinf->qi_lru);
 668 out_free_qinf:
 669         kmem_free(qinf);
 670         mp->m_quotainfo = NULL;
 671         return error;
 672 }
 673
 674
 675 /*
 676  * Gets called when unmounting a filesystem or when all quotas get
 677  * turned off.
 678  * This purges the quota inodes, destroys locks and frees itself.
 679  */
 680 void
 681 xfs_qm_destroy_quotainfo(
 682         xfs_mount_t     *mp)
 683 {
 684         xfs_quotainfo_t *qi;
 685
 686         qi = mp->m_quotainfo;
 687         ASSERT(qi != NULL);
 688
 689         unregister_shrinker(&qi->qi_shrinker);
 690         list_lru_destroy(&qi->qi_lru);
 691
 692         if (qi->qi_uquotaip) {
 693                 IRELE(qi->qi_uquotaip);
 694                 qi->qi_uquotaip = NULL; /* paranoia */
 695         }
 696         if (qi->qi_gquotaip) {
 697                 IRELE(qi->qi_gquotaip);
 698                 qi->qi_gquotaip = NULL;
 699         }
 700         if (qi->qi_pquotaip) {
 701                 IRELE(qi->qi_pquotaip);
 702                 qi->qi_pquotaip = NULL;
 703         }
 704         mutex_destroy(&qi->qi_quotaofflock);
 705         kmem_free(qi);
 706         mp->m_quotainfo = NULL;
 707 }
 708
 709 /*
 710  * Create an inode and return with a reference already taken, but unlocked
 711  * This is how we create quota inodes
 712  */
 713 STATIC int
 714 xfs_qm_qino_alloc(
 715         xfs_mount_t     *mp,
 716         xfs_inode_t     **ip,
 717         uint            flags)
 718 {
 719         xfs_trans_t     *tp;
 720         int             error;
 721         int             committed;
 722
 723         *ip = NULL;
 724         /*
 725          * With superblock that doesn't have separate pquotino, we
 726          * share an inode between gquota and pquota. If the on-disk
 727          * superblock has GQUOTA and the filesystem is now mounted
 728          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 729          * vice-versa.
 730          */
 731         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 732                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 733                 xfs_ino_t ino = NULLFSINO;
 734
 735                 if ((flags & XFS_QMOPT_PQUOTA) &&
 736                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 737                         ino = mp->m_sb.sb_gquotino;
 738                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 739                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 740                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 741                         ino = mp->m_sb.sb_pquotino;
 742                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 743                 }
 744                 if (ino != NULLFSINO) {
 745                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 746                         if (error)
 747                                 return error;
 748                         mp->m_sb.sb_gquotino = NULLFSINO;
 749                         mp->m_sb.sb_pquotino = NULLFSINO;
 750                 }
 751         }
 752
 753         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 754         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 755                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 756         if (error) {
 757                 xfs_trans_cancel(tp, 0);
 758                 return error;
 759         }
 760
 761         if (!*ip) {
 762                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 763                                                                 &committed);
 764                 if (error) {
 765                         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 766                                          XFS_TRANS_ABORT);
 767                         return error;
 768                 }
 769         }
 770
 771         /*
 772          * Make the changes in the superblock, and log those too.
 773          * sbfields arg may contain fields other than *QUOTINO;
 774          * VERSIONNUM for example.
 775          */
 776         spin_lock(&mp->m_sb_lock);
 777         if (flags & XFS_QMOPT_SBVERSION) {
 778                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 779
 780                 xfs_sb_version_addquota(&mp->m_sb);
 781                 mp->m_sb.sb_uquotino = NULLFSINO;
 782                 mp->m_sb.sb_gquotino = NULLFSINO;
 783                 mp->m_sb.sb_pquotino = NULLFSINO;
 784
 785                 /* qflags will get updated fully _after_ quotacheck */
 786                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 787         }
 788         if (flags & XFS_QMOPT_UQUOTA)
 789                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 790         else if (flags & XFS_QMOPT_GQUOTA)
 791                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 792         else
 793                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 794         spin_unlock(&mp->m_sb_lock);
 795         xfs_log_sb(tp);
 796
 797         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 798                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 799                 return error;
 800         }
 801         return 0;
 802 }
 803
 804
 805 STATIC void
 806 xfs_qm_reset_dqcounts(
 807         xfs_mount_t     *mp,
 808         xfs_buf_t       *bp,
 809         xfs_dqid_t      id,
 810         uint            type)
 811 {
 812         struct xfs_dqblk        *dqb;
 813         int                     j;
 814
 815         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 816
 817         /*
 818          * Reset all counters and timers. They'll be
 819          * started afresh by xfs_qm_quotacheck.
 820          */
 821 #ifdef DEBUG
 822         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 823         do_div(j, sizeof(xfs_dqblk_t));
 824         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 825 #endif
 826         dqb = bp->b_addr;
 827         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 828                 struct xfs_disk_dquot   *ddq;
 829
 830                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 831
 832                 /*
 833                  * Do a sanity check, and if needed, repair the dqblk. Don't
 834                  * output any warnings because it's perfectly possible to
 835                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 836                  */
 837                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 838                             "xfs_quotacheck");
 839                 /*
 840                  * Reset type in case we are reusing group quota file for
 841                  * project quotas or vice versa
 842                  */
 843                 ddq->d_flags = type;
 844                 ddq->d_bcount = 0;
 845                 ddq->d_icount = 0;
 846                 ddq->d_rtbcount = 0;
 847                 ddq->d_btimer = 0;
 848                 ddq->d_itimer = 0;
 849                 ddq->d_rtbtimer = 0;
 850                 ddq->d_bwarns = 0;
 851                 ddq->d_iwarns = 0;
 852                 ddq->d_rtbwarns = 0;
 853
 854                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 855                         xfs_update_cksum((char *)&dqb[j],
 856                                          sizeof(struct xfs_dqblk),
 857                                          XFS_DQUOT_CRC_OFF);
 858                 }
 859         }
 860 }
 861
 862 STATIC int
 863 xfs_qm_dqiter_bufs(
 864         struct xfs_mount        *mp,
 865         xfs_dqid_t              firstid,
 866         xfs_fsblock_t           bno,
 867         xfs_filblks_t           blkcnt,
 868         uint                    flags,
 869         struct list_head        *buffer_list)
 870 {
 871         struct xfs_buf          *bp;
 872         int                     error;
 873         int                     type;
 874
 875         ASSERT(blkcnt > 0);
 876         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 877                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 878         error = 0;
 879
 880         /*
 881          * Blkcnt arg can be a very big number, and might even be
 882          * larger than the log itself. So, we have to break it up into
 883          * manageable-sized transactions.
 884          * Note that we don't start a permanent transaction here; we might
 885          * not be able to get a log reservation for the whole thing up front,
 886          * and we don't really care to either, because we just discard
 887          * everything if we were to crash in the middle of this loop.
 888          */
 889         while (blkcnt--) {
 890                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 891                               XFS_FSB_TO_DADDR(mp, bno),
 892                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 893                               &xfs_dquot_buf_ops);
 894
 895                 /*
 896                  * CRC and validation errors will return a EFSCORRUPTED here. If
 897                  * this occurs, re-read without CRC validation so that we can
 898                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 899                  * will leave a trace in the log indicating corruption has
 900                  * been detected.
 901                  */
 902                 if (error == -EFSCORRUPTED) {
 903                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 904                                       XFS_FSB_TO_DADDR(mp, bno),
 905                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 906                                       NULL);
 907                 }
 908
 909                 if (error)
 910                         break;
 911
 912                 /*
 913                  * A corrupt buffer might not have a verifier attached, so
 914                  * make sure we have the correct one attached before writeback
 915                  * occurs.
 916                  */
 917                 bp->b_ops = &xfs_dquot_buf_ops;
 918                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 919                 xfs_buf_delwri_queue(bp, buffer_list);
 920                 xfs_buf_relse(bp);
 921
 922                 /* goto the next block. */
 923                 bno++;
 924                 firstid += mp->m_quotainfo->qi_dqperchunk;
 925         }
 926
 927         return error;
 928 }
 929
 930 /*
 931  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 932  * caller supplied function for every chunk of dquots that we find.
 933  */
 934 STATIC int
 935 xfs_qm_dqiterate(
 936         struct xfs_mount        *mp,
 937         struct xfs_inode        *qip,
 938         uint                    flags,
 939         struct list_head        *buffer_list)
 940 {
 941         struct xfs_bmbt_irec    *map;
 942         int                     i, nmaps;       /* number of map entries */
 943         int                     error;          /* return value */
 944         xfs_fileoff_t           lblkno;
 945         xfs_filblks_t           maxlblkcnt;
 946         xfs_dqid_t              firstid;
 947         xfs_fsblock_t           rablkno;
 948         xfs_filblks_t           rablkcnt;
 949
 950         error = 0;
 951         /*
 952          * This looks racy, but we can't keep an inode lock across a
 953          * trans_reserve. But, this gets called during quotacheck, and that
 954          * happens only at mount time which is single threaded.
 955          */
 956         if (qip->i_d.di_nblocks == 0)
 957                 return 0;
 958
 959         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 960
 961         lblkno = 0;
 962         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 963         do {
 964                 uint            lock_mode;
 965
 966                 nmaps = XFS_DQITER_MAP_SIZE;
 967                 /*
 968                  * We aren't changing the inode itself. Just changing
 969                  * some of its data. No new blocks are added here, and
 970                  * the inode is never added to the transaction.
 971                  */
 972                 lock_mode = xfs_ilock_data_map_shared(qip);
 973                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 974                                        map, &nmaps, 0);
 975                 xfs_iunlock(qip, lock_mode);
 976                 if (error)
 977                         break;
 978
 979                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 980                 for (i = 0; i < nmaps; i++) {
 981                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 982                         ASSERT(map[i].br_blockcount);
 983
 984
 985                         lblkno += map[i].br_blockcount;
 986
 987                         if (map[i].br_startblock == HOLESTARTBLOCK)
 988                                 continue;
 989
 990                         firstid = (xfs_dqid_t) map[i].br_startoff *
 991                                 mp->m_quotainfo->qi_dqperchunk;
 992                         /*
 993                          * Do a read-ahead on the next extent.
 994                          */
 995                         if ((i+1 < nmaps) &&
 996                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 997                                 rablkcnt =  map[i+1].br_blockcount;
 998                                 rablkno = map[i+1].br_startblock;
 999                                 while (rablkcnt--) {
1000                                         xfs_buf_readahead(mp->m_ddev_targp,
1001                                                XFS_FSB_TO_DADDR(mp, rablkno),
1002                                                mp->m_quotainfo->qi_dqchunklen,
1003                                                &xfs_dquot_buf_ops);
1004                                         rablkno++;
1005                                 }
1006                         }
1007                         /*
1008                          * Iterate thru all the blks in the extent and
1009                          * reset the counters of all the dquots inside them.
1010                          */
1011                         error = xfs_qm_dqiter_bufs(mp, firstid,
1012                                                    map[i].br_startblock,
1013                                                    map[i].br_blockcount,
1014                                                    flags, buffer_list);
1015                         if (error)
1016                                 goto out;
1017                 }
1018         } while (nmaps > 0);
1019
1020 out:
1021         kmem_free(map);
1022         return error;
1023 }
1024
1025 /*
1026  * Called by dqusage_adjust in doing a quotacheck.
1027  *
1028  * Given the inode, and a dquot id this updates both the incore dqout as well
1029  * as the buffer copy. This is so that once the quotacheck is done, we can
1030  * just log all the buffers, as opposed to logging numerous updates to
1031  * individual dquots.
1032  */
1033 STATIC int
1034 xfs_qm_quotacheck_dqadjust(
1035         struct xfs_inode        *ip,
1036         xfs_dqid_t              id,
1037         uint                    type,
1038         xfs_qcnt_t              nblks,
1039         xfs_qcnt_t              rtblks)
1040 {
1041         struct xfs_mount        *mp = ip->i_mount;
1042         struct xfs_dquot        *dqp;
1043         int                     error;
1044
1045         error = xfs_qm_dqget(mp, ip, id, type,
1046                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1047         if (error) {
1048                 /*
1049                  * Shouldn't be able to turn off quotas here.
1050                  */
1051                 ASSERT(error != -ESRCH);
1052                 ASSERT(error != -ENOENT);
1053                 return error;
1054         }
1055
1056         trace_xfs_dqadjust(dqp);
1057
1058         /*
1059          * Adjust the inode count and the block count to reflect this inode's
1060          * resource usage.
1061          */
1062         be64_add_cpu(&dqp->q_core.d_icount, 1);
1063         dqp->q_res_icount++;
1064         if (nblks) {
1065                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1066                 dqp->q_res_bcount += nblks;
1067         }
1068         if (rtblks) {
1069                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1070                 dqp->q_res_rtbcount += rtblks;
1071         }
1072
1073         /*
1074          * Set default limits, adjust timers (since we changed usages)
1075          *
1076          * There are no timers for the default values set in the root dquot.
1077          */
1078         if (dqp->q_core.d_id) {
1079                 xfs_qm_adjust_dqlimits(mp, dqp);
1080                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1081         }
1082
1083         dqp->dq_flags |= XFS_DQ_DIRTY;
1084         xfs_qm_dqput(dqp);
1085         return 0;
1086 }
1087
1088 STATIC int
1089 xfs_qm_get_rtblks(
1090         xfs_inode_t     *ip,
1091         xfs_qcnt_t      *O_rtblks)
1092 {
1093         xfs_filblks_t   rtblks;                 /* total rt blks */
1094         xfs_extnum_t    idx;                    /* extent record index */
1095         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1096         xfs_extnum_t    nextents;               /* number of extent entries */
1097         int             error;
1098
1099         ASSERT(XFS_IS_REALTIME_INODE(ip));
1100         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1101         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1102                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1103                         return error;
1104         }
1105         rtblks = 0;
1106         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1107         for (idx = 0; idx < nextents; idx++)
1108                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1109         *O_rtblks = (xfs_qcnt_t)rtblks;
1110         return 0;
1111 }
1112
1113 /*
1114  * callback routine supplied to bulkstat(). Given an inumber, find its
1115  * dquots and update them to account for resources taken by that inode.
1116  */
1117 /* ARGSUSED */
1118 STATIC int
1119 xfs_qm_dqusage_adjust(
1120         xfs_mount_t     *mp,            /* mount point for filesystem */
1121         xfs_ino_t       ino,            /* inode number to get data for */
1122         void            __user *buffer, /* not used */
1123         int             ubsize,         /* not used */
1124         int             *ubused,        /* not used */
1125         int             *res)           /* result code value */
1126 {
1127         xfs_inode_t     *ip;
1128         xfs_qcnt_t      nblks, rtblks = 0;
1129         int             error;
1130
1131         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1132
1133         /*
1134          * rootino must have its resources accounted for, not so with the quota
1135          * inodes.
1136          */
1137         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1138                 *res = BULKSTAT_RV_NOTHING;
1139                 return -EINVAL;
1140         }
1141
1142         /*
1143          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1144          * interface expects the inode to be exclusively locked because that's
1145          * the case in all other instances. It's OK that we do this because
1146          * quotacheck is done only at mount time.
1147          */
1148         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1149         if (error) {
1150                 *res = BULKSTAT_RV_NOTHING;
1151                 return error;
1152         }
1153
1154         ASSERT(ip->i_delayed_blks == 0);
1155
1156         if (XFS_IS_REALTIME_INODE(ip)) {
1157                 /*
1158                  * Walk thru the extent list and count the realtime blocks.
1159                  */
1160                 error = xfs_qm_get_rtblks(ip, &rtblks);
1161                 if (error)
1162                         goto error0;
1163         }
1164
1165         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1166
1167         /*
1168          * Add the (disk blocks and inode) resources occupied by this
1169          * inode to its dquots. We do this adjustment in the incore dquot,
1170          * and also copy the changes to its buffer.
1171          * We don't care about putting these changes in a transaction
1172          * envelope because if we crash in the middle of a 'quotacheck'
1173          * we have to start from the beginning anyway.
1174          * Once we're done, we'll log all the dquot bufs.
1175          *
1176          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1177          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1178          */
1179         if (XFS_IS_UQUOTA_ON(mp)) {
1180                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1181                                                    XFS_DQ_USER, nblks, rtblks);
1182                 if (error)
1183                         goto error0;
1184         }
1185
1186         if (XFS_IS_GQUOTA_ON(mp)) {
1187                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1188                                                    XFS_DQ_GROUP, nblks, rtblks);
1189                 if (error)
1190                         goto error0;
1191         }
1192
1193         if (XFS_IS_PQUOTA_ON(mp)) {
1194                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1195                                                    XFS_DQ_PROJ, nblks, rtblks);
1196                 if (error)
1197                         goto error0;
1198         }
1199
1200         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1201         IRELE(ip);
1202         *res = BULKSTAT_RV_DIDONE;
1203         return 0;
1204
1205 error0:
1206         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1207         IRELE(ip);
1208         *res = BULKSTAT_RV_GIVEUP;
1209         return error;
1210 }
1211
1212 STATIC int
1213 xfs_qm_flush_one(
1214         struct xfs_dquot        *dqp,
1215         void                    *data)
1216 {
1217         struct list_head        *buffer_list = data;
1218         struct xfs_buf          *bp = NULL;
1219         int                     error = 0;
1220
1221         xfs_dqlock(dqp);
1222         if (dqp->dq_flags & XFS_DQ_FREEING)
1223                 goto out_unlock;
1224         if (!XFS_DQ_IS_DIRTY(dqp))
1225                 goto out_unlock;
1226
1227         xfs_dqflock(dqp);
1228         error = xfs_qm_dqflush(dqp, &bp);
1229         if (error)
1230                 goto out_unlock;
1231
1232         xfs_buf_delwri_queue(bp, buffer_list);
1233         xfs_buf_relse(bp);
1234 out_unlock:
1235         xfs_dqunlock(dqp);
1236         return error;
1237 }
1238
1239 /*
1240  * Walk thru all the filesystem inodes and construct a consistent view
1241  * of the disk quota world. If the quotacheck fails, disable quotas.
1242  */
1243 STATIC int
1244 xfs_qm_quotacheck(
1245         xfs_mount_t     *mp)
1246 {
1247         int                     done, count, error, error2;
1248         xfs_ino_t               lastino;
1249         size_t                  structsz;
1250         uint                    flags;
1251         LIST_HEAD               (buffer_list);
1252         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1253         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1254         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1255
1256         count = INT_MAX;
1257         structsz = 1;
1258         lastino = 0;
1259         flags = 0;
1260
1261         ASSERT(uip || gip || pip);
1262         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1263
1264         xfs_notice(mp, "Quotacheck needed: Please wait.");
1265
1266         /*
1267          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1268          * their counters to zero. We need a clean slate.
1269          * We don't log our changes till later.
1270          */
1271         if (uip) {
1272                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1273                                          &buffer_list);
1274                 if (error)
1275                         goto error_return;
1276                 flags |= XFS_UQUOTA_CHKD;
1277         }
1278
1279         if (gip) {
1280                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1281                                          &buffer_list);
1282                 if (error)
1283                         goto error_return;
1284                 flags |= XFS_GQUOTA_CHKD;
1285         }
1286
1287         if (pip) {
1288                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1289                                          &buffer_list);
1290                 if (error)
1291                         goto error_return;
1292                 flags |= XFS_PQUOTA_CHKD;
1293         }
1294
1295         do {
1296                 /*
1297                  * Iterate thru all the inodes in the file system,
1298                  * adjusting the corresponding dquot counters in core.
1299                  */
1300                 error = xfs_bulkstat(mp, &lastino, &count,
1301                                      xfs_qm_dqusage_adjust,
1302                                      structsz, NULL, &done);
1303                 if (error)
1304                         break;
1305
1306         } while (!done);
1307
1308         /*
1309          * We've made all the changes that we need to make incore.  Flush them
1310          * down to disk buffers if everything was updated successfully.
1311          */
1312         if (XFS_IS_UQUOTA_ON(mp)) {
1313                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1314                                           &buffer_list);
1315         }
1316         if (XFS_IS_GQUOTA_ON(mp)) {
1317                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1318                                            &buffer_list);
1319                 if (!error)
1320                         error = error2;
1321         }
1322         if (XFS_IS_PQUOTA_ON(mp)) {
1323                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1324                                            &buffer_list);
1325                 if (!error)
1326                         error = error2;
1327         }
1328
1329         error2 = xfs_buf_delwri_submit(&buffer_list);
1330         if (!error)
1331                 error = error2;
1332
1333         /*
1334          * We can get this error if we couldn't do a dquot allocation inside
1335          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1336          * dirty dquots that might be cached, we just want to get rid of them
1337          * and turn quotaoff. The dquots won't be attached to any of the inodes
1338          * at this point (because we intentionally didn't in dqget_noattach).
1339          */
1340         if (error) {
1341                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1342                 goto error_return;
1343         }
1344
1345         /*
1346          * If one type of quotas is off, then it will lose its
1347          * quotachecked status, since we won't be doing accounting for
1348          * that type anymore.
1349          */
1350         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1351         mp->m_qflags |= flags;
1352
1353  error_return:
1354         while (!list_empty(&buffer_list)) {
1355                 struct xfs_buf *bp =
1356                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1357                 list_del_init(&bp->b_list);
1358                 xfs_buf_relse(bp);
1359         }
1360
1361         if (error) {
1362                 xfs_warn(mp,
1363         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1364                         error);
1365                 /*
1366                  * We must turn off quotas.
1367                  */
1368                 ASSERT(mp->m_quotainfo != NULL);
1369                 xfs_qm_destroy_quotainfo(mp);
1370                 if (xfs_mount_reset_sbqflags(mp)) {
1371                         xfs_warn(mp,
1372                                 "Quotacheck: Failed to reset quota flags.");
1373                 }
1374         } else
1375                 xfs_notice(mp, "Quotacheck: Done.");
1376         return error;
1377 }
1378
1379 /*
1380  * This is called from xfs_mountfs to start quotas and initialize all
1381  * necessary data structures like quotainfo.  This is also responsible for
1382  * running a quotacheck as necessary.  We are guaranteed that the superblock
1383  * is consistently read in at this point.
1384  *
1385  * If we fail here, the mount will continue with quota turned off. We don't
1386  * need to inidicate success or failure at all.
1387  */
1388 void
1389 xfs_qm_mount_quotas(
1390         struct xfs_mount        *mp)
1391 {
1392         int                     error = 0;
1393         uint                    sbf;
1394
1395         /*
1396          * If quotas on realtime volumes is not supported, we disable
1397          * quotas immediately.
1398          */
1399         if (mp->m_sb.sb_rextents) {
1400                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1401                 mp->m_qflags = 0;
1402                 goto write_changes;
1403         }
1404
1405         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1406
1407         /*
1408          * Allocate the quotainfo structure inside the mount struct, and
1409          * create quotainode(s), and change/rev superblock if necessary.
1410          */
1411         error = xfs_qm_init_quotainfo(mp);
1412         if (error) {
1413                 /*
1414                  * We must turn off quotas.
1415                  */
1416                 ASSERT(mp->m_quotainfo == NULL);
1417                 mp->m_qflags = 0;
1418                 goto write_changes;
1419         }
1420         /*
1421          * If any of the quotas are not consistent, do a quotacheck.
1422          */
1423         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1424                 error = xfs_qm_quotacheck(mp);
1425                 if (error) {
1426                         /* Quotacheck failed and disabled quotas. */
1427                         return;
1428                 }
1429         }
1430         /*
1431          * If one type of quotas is off, then it will lose its
1432          * quotachecked status, since we won't be doing accounting for
1433          * that type anymore.
1434          */
1435         if (!XFS_IS_UQUOTA_ON(mp))
1436                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1437         if (!XFS_IS_GQUOTA_ON(mp))
1438                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1439         if (!XFS_IS_PQUOTA_ON(mp))
1440                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1441
1442  write_changes:
1443         /*
1444          * We actually don't have to acquire the m_sb_lock at all.
1445          * This can only be called from mount, and that's single threaded. XXX
1446          */
1447         spin_lock(&mp->m_sb_lock);
1448         sbf = mp->m_sb.sb_qflags;
1449         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1450         spin_unlock(&mp->m_sb_lock);
1451
1452         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1453                 if (xfs_sync_sb(mp, false)) {
1454                         /*
1455                          * We could only have been turning quotas off.
1456                          * We aren't in very good shape actually because
1457                          * the incore structures are convinced that quotas are
1458                          * off, but the on disk superblock doesn't know that !
1459                          */
1460                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1461                         xfs_alert(mp, "%s: Superblock update failed!",
1462                                 __func__);
1463                 }
1464         }
1465
1466         if (error) {
1467                 xfs_warn(mp, "Failed to initialize disk quotas.");
1468                 return;
1469         }
1470 }
1471
1472 /*
1473  * This is called after the superblock has been read in and we're ready to
1474  * iget the quota inodes.
1475  */
1476 STATIC int
1477 xfs_qm_init_quotainos(
1478         xfs_mount_t     *mp)
1479 {
1480         struct xfs_inode        *uip = NULL;
1481         struct xfs_inode        *gip = NULL;
1482         struct xfs_inode        *pip = NULL;
1483         int                     error;
1484         uint                    flags = 0;
1485
1486         ASSERT(mp->m_quotainfo);
1487
1488         /*
1489          * Get the uquota and gquota inodes
1490          */
1491         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1492                 if (XFS_IS_UQUOTA_ON(mp) &&
1493                     mp->m_sb.sb_uquotino != NULLFSINO) {
1494                         ASSERT(mp->m_sb.sb_uquotino > 0);
1495                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1496                                              0, 0, &uip);
1497                         if (error)
1498                                 return error;
1499                 }
1500                 if (XFS_IS_GQUOTA_ON(mp) &&
1501                     mp->m_sb.sb_gquotino != NULLFSINO) {
1502                         ASSERT(mp->m_sb.sb_gquotino > 0);
1503                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1504                                              0, 0, &gip);
1505                         if (error)
1506                                 goto error_rele;
1507                 }
1508                 if (XFS_IS_PQUOTA_ON(mp) &&
1509                     mp->m_sb.sb_pquotino != NULLFSINO) {
1510                         ASSERT(mp->m_sb.sb_pquotino > 0);
1511                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1512                                              0, 0, &pip);
1513                         if (error)
1514                                 goto error_rele;
1515                 }
1516         } else {
1517                 flags |= XFS_QMOPT_SBVERSION;
1518         }
1519
1520         /*
1521          * Create the three inodes, if they don't exist already. The changes
1522          * made above will get added to a transaction and logged in one of
1523          * the qino_alloc calls below.  If the device is readonly,
1524          * temporarily switch to read-write to do this.
1525          */
1526         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1527                 error = xfs_qm_qino_alloc(mp, &uip,
1528                                               flags | XFS_QMOPT_UQUOTA);
1529                 if (error)
1530                         goto error_rele;
1531
1532                 flags &= ~XFS_QMOPT_SBVERSION;
1533         }
1534         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1535                 error = xfs_qm_qino_alloc(mp, &gip,
1536                                           flags | XFS_QMOPT_GQUOTA);
1537                 if (error)
1538                         goto error_rele;
1539
1540                 flags &= ~XFS_QMOPT_SBVERSION;
1541         }
1542         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1543                 error = xfs_qm_qino_alloc(mp, &pip,
1544                                           flags | XFS_QMOPT_PQUOTA);
1545                 if (error)
1546                         goto error_rele;
1547         }
1548
1549         mp->m_quotainfo->qi_uquotaip = uip;
1550         mp->m_quotainfo->qi_gquotaip = gip;
1551         mp->m_quotainfo->qi_pquotaip = pip;
1552
1553         return 0;
1554
1555 error_rele:
1556         if (uip)
1557                 IRELE(uip);
1558         if (gip)
1559                 IRELE(gip);
1560         if (pip)
1561                 IRELE(pip);
1562         return error;
1563 }
1564
1565 STATIC void
1566 xfs_qm_dqfree_one(
1567         struct xfs_dquot        *dqp)
1568 {
1569         struct xfs_mount        *mp = dqp->q_mount;
1570         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1571
1572         mutex_lock(&qi->qi_tree_lock);
1573         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1574                           be32_to_cpu(dqp->q_core.d_id));
1575
1576         qi->qi_dquots--;
1577         mutex_unlock(&qi->qi_tree_lock);
1578
1579         xfs_qm_dqdestroy(dqp);
1580 }
1581
1582 /* --------------- utility functions for vnodeops ---------------- */
1583
1584
1585 /*
1586  * Given an inode, a uid, gid and prid make sure that we have
1587  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1588  * quotas by creating this file.
1589  * This also attaches dquot(s) to the given inode after locking it,
1590  * and returns the dquots corresponding to the uid and/or gid.
1591  *
1592  * in   : inode (unlocked)
1593  * out  : udquot, gdquot with references taken and unlocked
1594  */
1595 int
1596 xfs_qm_vop_dqalloc(
1597         struct xfs_inode        *ip,
1598         xfs_dqid_t              uid,
1599         xfs_dqid_t              gid,
1600         prid_t                  prid,
1601         uint                    flags,
1602         struct xfs_dquot        **O_udqpp,
1603         struct xfs_dquot        **O_gdqpp,
1604         struct xfs_dquot        **O_pdqpp)
1605 {
1606         struct xfs_mount        *mp = ip->i_mount;
1607         struct xfs_dquot        *uq = NULL;
1608         struct xfs_dquot        *gq = NULL;
1609         struct xfs_dquot        *pq = NULL;
1610         int                     error;
1611         uint                    lockflags;
1612
1613         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1614                 return 0;
1615
1616         lockflags = XFS_ILOCK_EXCL;
1617         xfs_ilock(ip, lockflags);
1618
1619         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1620                 gid = ip->i_d.di_gid;
1621
1622         /*
1623          * Attach the dquot(s) to this inode, doing a dquot allocation
1624          * if necessary. The dquot(s) will not be locked.
1625          */
1626         if (XFS_NOT_DQATTACHED(mp, ip)) {
1627                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1628                 if (error) {
1629                         xfs_iunlock(ip, lockflags);
1630                         return error;
1631                 }
1632         }
1633
1634         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1635                 if (ip->i_d.di_uid != uid) {
1636                         /*
1637                          * What we need is the dquot that has this uid, and
1638                          * if we send the inode to dqget, the uid of the inode
1639                          * takes priority over what's sent in the uid argument.
1640                          * We must unlock inode here before calling dqget if
1641                          * we're not sending the inode, because otherwise
1642                          * we'll deadlock by doing trans_reserve while
1643                          * holding ilock.
1644                          */
1645                         xfs_iunlock(ip, lockflags);
1646                         error = xfs_qm_dqget(mp, NULL, uid,
1647                                                  XFS_DQ_USER,
1648                                                  XFS_QMOPT_DQALLOC |
1649                                                  XFS_QMOPT_DOWARN,
1650                                                  &uq);
1651                         if (error) {
1652                                 ASSERT(error != -ENOENT);
1653                                 return error;
1654                         }
1655                         /*
1656                          * Get the ilock in the right order.
1657                          */
1658                         xfs_dqunlock(uq);
1659                         lockflags = XFS_ILOCK_SHARED;
1660                         xfs_ilock(ip, lockflags);
1661                 } else {
1662                         /*
1663                          * Take an extra reference, because we'll return
1664                          * this to caller
1665                          */
1666                         ASSERT(ip->i_udquot);
1667                         uq = xfs_qm_dqhold(ip->i_udquot);
1668                 }
1669         }
1670         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1671                 if (ip->i_d.di_gid != gid) {
1672                         xfs_iunlock(ip, lockflags);
1673                         error = xfs_qm_dqget(mp, NULL, gid,
1674                                                  XFS_DQ_GROUP,
1675                                                  XFS_QMOPT_DQALLOC |
1676                                                  XFS_QMOPT_DOWARN,
1677                                                  &gq);
1678                         if (error) {
1679                                 ASSERT(error != -ENOENT);
1680                                 goto error_rele;
1681                         }
1682                         xfs_dqunlock(gq);
1683                         lockflags = XFS_ILOCK_SHARED;
1684                         xfs_ilock(ip, lockflags);
1685                 } else {
1686                         ASSERT(ip->i_gdquot);
1687                         gq = xfs_qm_dqhold(ip->i_gdquot);
1688                 }
1689         }
1690         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1691                 if (xfs_get_projid(ip) != prid) {
1692                         xfs_iunlock(ip, lockflags);
1693                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1694                                                  XFS_DQ_PROJ,
1695                                                  XFS_QMOPT_DQALLOC |
1696                                                  XFS_QMOPT_DOWARN,
1697                                                  &pq);
1698                         if (error) {
1699                                 ASSERT(error != -ENOENT);
1700                                 goto error_rele;
1701                         }
1702                         xfs_dqunlock(pq);
1703                         lockflags = XFS_ILOCK_SHARED;
1704                         xfs_ilock(ip, lockflags);
1705                 } else {
1706                         ASSERT(ip->i_pdquot);
1707                         pq = xfs_qm_dqhold(ip->i_pdquot);
1708                 }
1709         }
1710         if (uq)
1711                 trace_xfs_dquot_dqalloc(ip);
1712
1713         xfs_iunlock(ip, lockflags);
1714         if (O_udqpp)
1715                 *O_udqpp = uq;
1716         else
1717                 xfs_qm_dqrele(uq);
1718         if (O_gdqpp)
1719                 *O_gdqpp = gq;
1720         else
1721                 xfs_qm_dqrele(gq);
1722         if (O_pdqpp)
1723                 *O_pdqpp = pq;
1724         else
1725                 xfs_qm_dqrele(pq);
1726         return 0;
1727
1728 error_rele:
1729         xfs_qm_dqrele(gq);
1730         xfs_qm_dqrele(uq);
1731         return error;
1732 }
1733
1734 /*
1735  * Actually transfer ownership, and do dquot modifications.
1736  * These were already reserved.
1737  */
1738 xfs_dquot_t *
1739 xfs_qm_vop_chown(
1740         xfs_trans_t     *tp,
1741         xfs_inode_t     *ip,
1742         xfs_dquot_t     **IO_olddq,
1743         xfs_dquot_t     *newdq)
1744 {
1745         xfs_dquot_t     *prevdq;
1746         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1747                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1748
1749
1750         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1751         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1752
1753         /* old dquot */
1754         prevdq = *IO_olddq;
1755         ASSERT(prevdq);
1756         ASSERT(prevdq != newdq);
1757
1758         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1759         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1760
1761         /* the sparkling new dquot */
1762         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1763         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1764
1765         /*
1766          * Take an extra reference, because the inode is going to keep
1767          * this dquot pointer even after the trans_commit.
1768          */
1769         *IO_olddq = xfs_qm_dqhold(newdq);
1770
1771         return prevdq;
1772 }
1773
1774 /*
1775  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1776  */
1777 int
1778 xfs_qm_vop_chown_reserve(
1779         struct xfs_trans        *tp,
1780         struct xfs_inode        *ip,
1781         struct xfs_dquot        *udqp,
1782         struct xfs_dquot        *gdqp,
1783         struct xfs_dquot        *pdqp,
1784         uint                    flags)
1785 {
1786         struct xfs_mount        *mp = ip->i_mount;
1787         uint                    delblks, blkflags, prjflags = 0;
1788         struct xfs_dquot        *udq_unres = NULL;
1789         struct xfs_dquot        *gdq_unres = NULL;
1790         struct xfs_dquot        *pdq_unres = NULL;
1791         struct xfs_dquot        *udq_delblks = NULL;
1792         struct xfs_dquot        *gdq_delblks = NULL;
1793         struct xfs_dquot        *pdq_delblks = NULL;
1794         int                     error;
1795
1796
1797         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1798         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1799
1800         delblks = ip->i_delayed_blks;
1801         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1802                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1803
1804         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1805             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1806                 udq_delblks = udqp;
1807                 /*
1808                  * If there are delayed allocation blocks, then we have to
1809                  * unreserve those from the old dquot, and add them to the
1810                  * new dquot.
1811                  */
1812                 if (delblks) {
1813                         ASSERT(ip->i_udquot);
1814                         udq_unres = ip->i_udquot;
1815                 }
1816         }
1817         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1818             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1819                 gdq_delblks = gdqp;
1820                 if (delblks) {
1821                         ASSERT(ip->i_gdquot);
1822                         gdq_unres = ip->i_gdquot;
1823                 }
1824         }
1825
1826         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1827             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1828                 prjflags = XFS_QMOPT_ENOSPC;
1829                 pdq_delblks = pdqp;
1830                 if (delblks) {
1831                         ASSERT(ip->i_pdquot);
1832                         pdq_unres = ip->i_pdquot;
1833                 }
1834         }
1835
1836         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1837                                 udq_delblks, gdq_delblks, pdq_delblks,
1838                                 ip->i_d.di_nblocks, 1,
1839                                 flags | blkflags | prjflags);
1840         if (error)
1841                 return error;
1842
1843         /*
1844          * Do the delayed blks reservations/unreservations now. Since, these
1845          * are done without the help of a transaction, if a reservation fails
1846          * its previous reservations won't be automatically undone by trans
1847          * code. So, we have to do it manually here.
1848          */
1849         if (delblks) {
1850                 /*
1851                  * Do the reservations first. Unreservation can't fail.
1852                  */
1853                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1854                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1855                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1856                             udq_delblks, gdq_delblks, pdq_delblks,
1857                             (xfs_qcnt_t)delblks, 0,
1858                             flags | blkflags | prjflags);
1859                 if (error)
1860                         return error;
1861                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1862                                 udq_unres, gdq_unres, pdq_unres,
1863                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1864         }
1865
1866         return 0;
1867 }
1868
1869 int
1870 xfs_qm_vop_rename_dqattach(
1871         struct xfs_inode        **i_tab)
1872 {
1873         struct xfs_mount        *mp = i_tab[0]->i_mount;
1874         int                     i;
1875
1876         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1877                 return 0;
1878
1879         for (i = 0; (i < 4 && i_tab[i]); i++) {
1880                 struct xfs_inode        *ip = i_tab[i];
1881                 int                     error;
1882
1883                 /*
1884                  * Watch out for duplicate entries in the table.
1885                  */
1886                 if (i == 0 || ip != i_tab[i-1]) {
1887                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1888                                 error = xfs_qm_dqattach(ip, 0);
1889                                 if (error)
1890                                         return error;
1891                         }
1892                 }
1893         }
1894         return 0;
1895 }
1896
1897 void
1898 xfs_qm_vop_create_dqattach(
1899         struct xfs_trans        *tp,
1900         struct xfs_inode        *ip,
1901         struct xfs_dquot        *udqp,
1902         struct xfs_dquot        *gdqp,
1903         struct xfs_dquot        *pdqp)
1904 {
1905         struct xfs_mount        *mp = tp->t_mountp;
1906
1907         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1908                 return;
1909
1910         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1911         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1912
1913         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1914                 ASSERT(ip->i_udquot == NULL);
1915                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1916
1917                 ip->i_udquot = xfs_qm_dqhold(udqp);
1918                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1919         }
1920         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1921                 ASSERT(ip->i_gdquot == NULL);
1922                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1923                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1924                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1925         }
1926         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1927                 ASSERT(ip->i_pdquot == NULL);
1928                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1929
1930                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1931                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1932         }
1933 }
1934