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 STATIC void     xfs_qm_destroy_quotainos(xfs_quotainfo_t *qi);
  51 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  52 /*
  53  * We use the batch lookup interface to iterate over the dquots as it
  54  * currently is the only interface into the radix tree code that allows
  55  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  56  * operations is fine as all callers are used either during mount/umount
  57  * or quotaoff.
  58  */
  59 #define XFS_DQ_LOOKUP_BATCH     32
  60
  61 STATIC int
  62 xfs_qm_dquot_walk(
  63         struct xfs_mount        *mp,
  64         int                     type,
  65         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  66         void                    *data)
  67 {
  68         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  69         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  70         uint32_t                next_index;
  71         int                     last_error = 0;
  72         int                     skipped;
  73         int                     nr_found;
  74
  75 restart:
  76         skipped = 0;
  77         next_index = 0;
  78         nr_found = 0;
  79
  80         while (1) {
  81                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  82                 int             error = 0;
  83                 int             i;
  84
  85                 mutex_lock(&qi->qi_tree_lock);
  86                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  87                                         next_index, XFS_DQ_LOOKUP_BATCH);
  88                 if (!nr_found) {
  89                         mutex_unlock(&qi->qi_tree_lock);
  90                         break;
  91                 }
  92
  93                 for (i = 0; i < nr_found; i++) {
  94                         struct xfs_dquot *dqp = batch[i];
  95
  96                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  97
  98                         error = execute(batch[i], data);
  99                         if (error == -EAGAIN) {
 100                                 skipped++;
 101                                 continue;
 102                         }
 103                         if (error && last_error != -EFSCORRUPTED)
 104                                 last_error = error;
 105                 }
 106
 107                 mutex_unlock(&qi->qi_tree_lock);
 108
 109                 /* bail out if the filesystem is corrupted.  */
 110                 if (last_error == -EFSCORRUPTED) {
 111                         skipped = 0;
 112                         break;
 113                 }
 114         }
 115
 116         if (skipped) {
 117                 delay(1);
 118                 goto restart;
 119         }
 120
 121         return last_error;
 122 }
 123
 124
 125 /*
 126  * Purge a dquot from all tracking data structures and free it.
 127  */
 128 STATIC int
 129 xfs_qm_dqpurge(
 130         struct xfs_dquot        *dqp,
 131         void                    *data)
 132 {
 133         struct xfs_mount        *mp = dqp->q_mount;
 134         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 135
 136         xfs_dqlock(dqp);
 137         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 138                 xfs_dqunlock(dqp);
 139                 return -EAGAIN;
 140         }
 141
 142         dqp->dq_flags |= XFS_DQ_FREEING;
 143
 144         xfs_dqflock(dqp);
 145
 146         /*
 147          * If we are turning this type of quotas off, we don't care
 148          * about the dirty metadata sitting in this dquot. OTOH, if
 149          * we're unmounting, we do care, so we flush it and wait.
 150          */
 151         if (XFS_DQ_IS_DIRTY(dqp)) {
 152                 struct xfs_buf  *bp = NULL;
 153                 int             error;
 154
 155                 /*
 156                  * We don't care about getting disk errors here. We need
 157                  * to purge this dquot anyway, so we go ahead regardless.
 158                  */
 159                 error = xfs_qm_dqflush(dqp, &bp);
 160                 if (error) {
 161                         xfs_warn(mp, "%s: dquot %p flush failed",
 162                                 __func__, dqp);
 163                 } else {
 164                         error = xfs_bwrite(bp);
 165                         xfs_buf_relse(bp);
 166                 }
 167                 xfs_dqflock(dqp);
 168         }
 169
 170         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 171         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 172                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 173
 174         xfs_dqfunlock(dqp);
 175         xfs_dqunlock(dqp);
 176
 177         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 178                           be32_to_cpu(dqp->q_core.d_id));
 179         qi->qi_dquots--;
 180
 181         /*
 182          * We move dquots to the freelist as soon as their reference count
 183          * hits zero, so it really should be on the freelist here.
 184          */
 185         ASSERT(!list_empty(&dqp->q_lru));
 186         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 187         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 188
 189         xfs_qm_dqdestroy(dqp);
 190         return 0;
 191 }
 192
 193 /*
 194  * Purge the dquot cache.
 195  */
 196 void
 197 xfs_qm_dqpurge_all(
 198         struct xfs_mount        *mp,
 199         uint                    flags)
 200 {
 201         if (flags & XFS_QMOPT_UQUOTA)
 202                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 203         if (flags & XFS_QMOPT_GQUOTA)
 204                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 205         if (flags & XFS_QMOPT_PQUOTA)
 206                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 207 }
 208
 209 /*
 210  * Just destroy the quotainfo structure.
 211  */
 212 void
 213 xfs_qm_unmount(
 214         struct xfs_mount        *mp)
 215 {
 216         if (mp->m_quotainfo) {
 217                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 218                 xfs_qm_destroy_quotainfo(mp);
 219         }
 220 }
 221
 222 /*
 223  * Called from the vfsops layer.
 224  */
 225 void
 226 xfs_qm_unmount_quotas(
 227         xfs_mount_t     *mp)
 228 {
 229         /*
 230          * Release the dquots that root inode, et al might be holding,
 231          * before we flush quotas and blow away the quotainfo structure.
 232          */
 233         ASSERT(mp->m_rootip);
 234         xfs_qm_dqdetach(mp->m_rootip);
 235         if (mp->m_rbmip)
 236                 xfs_qm_dqdetach(mp->m_rbmip);
 237         if (mp->m_rsumip)
 238                 xfs_qm_dqdetach(mp->m_rsumip);
 239
 240         /*
 241          * Release the quota inodes.
 242          */
 243         if (mp->m_quotainfo) {
 244                 if (mp->m_quotainfo->qi_uquotaip) {
 245                         IRELE(mp->m_quotainfo->qi_uquotaip);
 246                         mp->m_quotainfo->qi_uquotaip = NULL;
 247                 }
 248                 if (mp->m_quotainfo->qi_gquotaip) {
 249                         IRELE(mp->m_quotainfo->qi_gquotaip);
 250                         mp->m_quotainfo->qi_gquotaip = NULL;
 251                 }
 252                 if (mp->m_quotainfo->qi_pquotaip) {
 253                         IRELE(mp->m_quotainfo->qi_pquotaip);
 254                         mp->m_quotainfo->qi_pquotaip = NULL;
 255                 }
 256         }
 257 }
 258
 259 STATIC int
 260 xfs_qm_dqattach_one(
 261         xfs_inode_t     *ip,
 262         xfs_dqid_t      id,
 263         uint            type,
 264         uint            doalloc,
 265         xfs_dquot_t     **IO_idqpp)
 266 {
 267         xfs_dquot_t     *dqp;
 268         int             error;
 269
 270         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 271         error = 0;
 272
 273         /*
 274          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 275          * or &i_gdquot. This made the code look weird, but made the logic a lot
 276          * simpler.
 277          */
 278         dqp = *IO_idqpp;
 279         if (dqp) {
 280                 trace_xfs_dqattach_found(dqp);
 281                 return 0;
 282         }
 283
 284         /*
 285          * Find the dquot from somewhere. This bumps the reference count of
 286          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 287          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 288          * turned off suddenly.
 289          */
 290         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 291                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 292         if (error)
 293                 return error;
 294
 295         trace_xfs_dqattach_get(dqp);
 296
 297         /*
 298          * dqget may have dropped and re-acquired the ilock, but it guarantees
 299          * that the dquot returned is the one that should go in the inode.
 300          */
 301         *IO_idqpp = dqp;
 302         xfs_dqunlock(dqp);
 303         return 0;
 304 }
 305
 306 static bool
 307 xfs_qm_need_dqattach(
 308         struct xfs_inode        *ip)
 309 {
 310         struct xfs_mount        *mp = ip->i_mount;
 311
 312         if (!XFS_IS_QUOTA_RUNNING(mp))
 313                 return false;
 314         if (!XFS_IS_QUOTA_ON(mp))
 315                 return false;
 316         if (!XFS_NOT_DQATTACHED(mp, ip))
 317                 return false;
 318         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 319                 return false;
 320         return true;
 321 }
 322
 323 /*
 324  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 325  * into account.
 326  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 327  * Inode may get unlocked and relocked in here, and the caller must deal with
 328  * the consequences.
 329  */
 330 int
 331 xfs_qm_dqattach_locked(
 332         xfs_inode_t     *ip,
 333         uint            flags)
 334 {
 335         xfs_mount_t     *mp = ip->i_mount;
 336         int             error = 0;
 337
 338         if (!xfs_qm_need_dqattach(ip))
 339                 return 0;
 340
 341         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 342
 343         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 344                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 345                                                 flags & XFS_QMOPT_DQALLOC,
 346                                                 &ip->i_udquot);
 347                 if (error)
 348                         goto done;
 349                 ASSERT(ip->i_udquot);
 350         }
 351
 352         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 353                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 354                                                 flags & XFS_QMOPT_DQALLOC,
 355                                                 &ip->i_gdquot);
 356                 if (error)
 357                         goto done;
 358                 ASSERT(ip->i_gdquot);
 359         }
 360
 361         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 362                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 363                                                 flags & XFS_QMOPT_DQALLOC,
 364                                                 &ip->i_pdquot);
 365                 if (error)
 366                         goto done;
 367                 ASSERT(ip->i_pdquot);
 368         }
 369
 370 done:
 371         /*
 372          * Don't worry about the dquots that we may have attached before any
 373          * error - they'll get detached later if it has not already been done.
 374          */
 375         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 376         return error;
 377 }
 378
 379 int
 380 xfs_qm_dqattach(
 381         struct xfs_inode        *ip,
 382         uint                    flags)
 383 {
 384         int                     error;
 385
 386         if (!xfs_qm_need_dqattach(ip))
 387                 return 0;
 388
 389         xfs_ilock(ip, XFS_ILOCK_EXCL);
 390         error = xfs_qm_dqattach_locked(ip, flags);
 391         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 392
 393         return error;
 394 }
 395
 396 /*
 397  * Release dquots (and their references) if any.
 398  * The inode should be locked EXCL except when this's called by
 399  * xfs_ireclaim.
 400  */
 401 void
 402 xfs_qm_dqdetach(
 403         xfs_inode_t     *ip)
 404 {
 405         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 406                 return;
 407
 408         trace_xfs_dquot_dqdetach(ip);
 409
 410         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 411         if (ip->i_udquot) {
 412                 xfs_qm_dqrele(ip->i_udquot);
 413                 ip->i_udquot = NULL;
 414         }
 415         if (ip->i_gdquot) {
 416                 xfs_qm_dqrele(ip->i_gdquot);
 417                 ip->i_gdquot = NULL;
 418         }
 419         if (ip->i_pdquot) {
 420                 xfs_qm_dqrele(ip->i_pdquot);
 421                 ip->i_pdquot = NULL;
 422         }
 423 }
 424
 425 struct xfs_qm_isolate {
 426         struct list_head        buffers;
 427         struct list_head        dispose;
 428 };
 429
 430 static enum lru_status
 431 xfs_qm_dquot_isolate(
 432         struct list_head        *item,
 433         struct list_lru_one     *lru,
 434         spinlock_t              *lru_lock,
 435         void                    *arg)
 436                 __releases(lru_lock) __acquires(lru_lock)
 437 {
 438         struct xfs_dquot        *dqp = container_of(item,
 439                                                 struct xfs_dquot, q_lru);
 440         struct xfs_qm_isolate   *isol = arg;
 441
 442         if (!xfs_dqlock_nowait(dqp))
 443                 goto out_miss_busy;
 444
 445         /*
 446          * This dquot has acquired a reference in the meantime remove it from
 447          * the freelist and try again.
 448          */
 449         if (dqp->q_nrefs) {
 450                 xfs_dqunlock(dqp);
 451                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 452
 453                 trace_xfs_dqreclaim_want(dqp);
 454                 list_lru_isolate(lru, &dqp->q_lru);
 455                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 456                 return LRU_REMOVED;
 457         }
 458
 459         /*
 460          * If the dquot is dirty, flush it. If it's already being flushed, just
 461          * skip it so there is time for the IO to complete before we try to
 462          * reclaim it again on the next LRU pass.
 463          */
 464         if (!xfs_dqflock_nowait(dqp)) {
 465                 xfs_dqunlock(dqp);
 466                 goto out_miss_busy;
 467         }
 468
 469         if (XFS_DQ_IS_DIRTY(dqp)) {
 470                 struct xfs_buf  *bp = NULL;
 471                 int             error;
 472
 473                 trace_xfs_dqreclaim_dirty(dqp);
 474
 475                 /* we have to drop the LRU lock to flush the dquot */
 476                 spin_unlock(lru_lock);
 477
 478                 error = xfs_qm_dqflush(dqp, &bp);
 479                 if (error) {
 480                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 481                                  __func__, dqp);
 482                         goto out_unlock_dirty;
 483                 }
 484
 485                 xfs_buf_delwri_queue(bp, &isol->buffers);
 486                 xfs_buf_relse(bp);
 487                 goto out_unlock_dirty;
 488         }
 489         xfs_dqfunlock(dqp);
 490
 491         /*
 492          * Prevent lookups now that we are past the point of no return.
 493          */
 494         dqp->dq_flags |= XFS_DQ_FREEING;
 495         xfs_dqunlock(dqp);
 496
 497         ASSERT(dqp->q_nrefs == 0);
 498         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 499         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 500         trace_xfs_dqreclaim_done(dqp);
 501         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 502         return LRU_REMOVED;
 503
 504 out_miss_busy:
 505         trace_xfs_dqreclaim_busy(dqp);
 506         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 507         return LRU_SKIP;
 508
 509 out_unlock_dirty:
 510         trace_xfs_dqreclaim_busy(dqp);
 511         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 512         xfs_dqunlock(dqp);
 513         spin_lock(lru_lock);
 514         return LRU_RETRY;
 515 }
 516
 517 static unsigned long
 518 xfs_qm_shrink_scan(
 519         struct shrinker         *shrink,
 520         struct shrink_control   *sc)
 521 {
 522         struct xfs_quotainfo    *qi = container_of(shrink,
 523                                         struct xfs_quotainfo, qi_shrinker);
 524         struct xfs_qm_isolate   isol;
 525         unsigned long           freed;
 526         int                     error;
 527
 528         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 529                 return 0;
 530
 531         INIT_LIST_HEAD(&isol.buffers);
 532         INIT_LIST_HEAD(&isol.dispose);
 533
 534         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 535                                      xfs_qm_dquot_isolate, &isol);
 536
 537         error = xfs_buf_delwri_submit(&isol.buffers);
 538         if (error)
 539                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 540
 541         while (!list_empty(&isol.dispose)) {
 542                 struct xfs_dquot        *dqp;
 543
 544                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 545                 list_del_init(&dqp->q_lru);
 546                 xfs_qm_dqfree_one(dqp);
 547         }
 548
 549         return freed;
 550 }
 551
 552 static unsigned long
 553 xfs_qm_shrink_count(
 554         struct shrinker         *shrink,
 555         struct shrink_control   *sc)
 556 {
 557         struct xfs_quotainfo    *qi = container_of(shrink,
 558                                         struct xfs_quotainfo, qi_shrinker);
 559
 560         return list_lru_shrink_count(&qi->qi_lru, sc);
 561 }
 562
 563 /*
 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
 664         error = register_shrinker(&qinf->qi_shrinker);
 665         if (error)
 666                 goto out_free_inos;
 667
 668         return 0;
 669
 670 out_free_inos:
 671         mutex_destroy(&qinf->qi_quotaofflock);
 672         mutex_destroy(&qinf->qi_tree_lock);
 673         xfs_qm_destroy_quotainos(qinf);
 674 out_free_lru:
 675         list_lru_destroy(&qinf->qi_lru);
 676 out_free_qinf:
 677         kmem_free(qinf);
 678         mp->m_quotainfo = NULL;
 679         return error;
 680 }
 681
 682 /*
 683  * Gets called when unmounting a filesystem or when all quotas get
 684  * turned off.
 685  * This purges the quota inodes, destroys locks and frees itself.
 686  */
 687 void
 688 xfs_qm_destroy_quotainfo(
 689         xfs_mount_t     *mp)
 690 {
 691         xfs_quotainfo_t *qi;
 692
 693         qi = mp->m_quotainfo;
 694         ASSERT(qi != NULL);
 695
 696         unregister_shrinker(&qi->qi_shrinker);
 697         list_lru_destroy(&qi->qi_lru);
 698         xfs_qm_destroy_quotainos(qi);
 699         mutex_destroy(&qi->qi_tree_lock);
 700         mutex_destroy(&qi->qi_quotaofflock);
 701         kmem_free(qi);
 702         mp->m_quotainfo = NULL;
 703 }
 704
 705 /*
 706  * Create an inode and return with a reference already taken, but unlocked
 707  * This is how we create quota inodes
 708  */
 709 STATIC int
 710 xfs_qm_qino_alloc(
 711         xfs_mount_t     *mp,
 712         xfs_inode_t     **ip,
 713         uint            flags)
 714 {
 715         xfs_trans_t     *tp;
 716         int             error;
 717         int             committed;
 718         bool            need_alloc = true;
 719
 720         *ip = NULL;
 721         /*
 722          * With superblock that doesn't have separate pquotino, we
 723          * share an inode between gquota and pquota. If the on-disk
 724          * superblock has GQUOTA and the filesystem is now mounted
 725          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 726          * vice-versa.
 727          */
 728         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 729                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 730                 xfs_ino_t ino = NULLFSINO;
 731
 732                 if ((flags & XFS_QMOPT_PQUOTA) &&
 733                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 734                         ino = mp->m_sb.sb_gquotino;
 735                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 736                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 737                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 738                         ino = mp->m_sb.sb_pquotino;
 739                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 740                 }
 741                 if (ino != NULLFSINO) {
 742                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 743                         if (error)
 744                                 return error;
 745                         mp->m_sb.sb_gquotino = NULLFSINO;
 746                         mp->m_sb.sb_pquotino = NULLFSINO;
 747                         need_alloc = false;
 748                 }
 749         }
 750
 751         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 752         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 753                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 754         if (error) {
 755                 xfs_trans_cancel(tp);
 756                 return error;
 757         }
 758
 759         if (need_alloc) {
 760                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 761                                                                 &committed);
 762                 if (error) {
 763                         xfs_trans_cancel(tp);
 764                         return error;
 765                 }
 766         }
 767
 768         /*
 769          * Make the changes in the superblock, and log those too.
 770          * sbfields arg may contain fields other than *QUOTINO;
 771          * VERSIONNUM for example.
 772          */
 773         spin_lock(&mp->m_sb_lock);
 774         if (flags & XFS_QMOPT_SBVERSION) {
 775                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 776
 777                 xfs_sb_version_addquota(&mp->m_sb);
 778                 mp->m_sb.sb_uquotino = NULLFSINO;
 779                 mp->m_sb.sb_gquotino = NULLFSINO;
 780                 mp->m_sb.sb_pquotino = NULLFSINO;
 781
 782                 /* qflags will get updated fully _after_ quotacheck */
 783                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 784         }
 785         if (flags & XFS_QMOPT_UQUOTA)
 786                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 787         else if (flags & XFS_QMOPT_GQUOTA)
 788                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 789         else
 790                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 791         spin_unlock(&mp->m_sb_lock);
 792         xfs_log_sb(tp);
 793
 794         error = xfs_trans_commit(tp);
 795         if (error) {
 796                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 797                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 798         }
 799         if (need_alloc)
 800                 xfs_finish_inode_setup(*ip);
 801         return error;
 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         xfs_buf_delwri_cancel(&buffer_list);
1355
1356         if (error) {
1357                 xfs_warn(mp,
1358         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1359                         error);
1360                 /*
1361                  * We must turn off quotas.
1362                  */
1363                 ASSERT(mp->m_quotainfo != NULL);
1364                 xfs_qm_destroy_quotainfo(mp);
1365                 if (xfs_mount_reset_sbqflags(mp)) {
1366                         xfs_warn(mp,
1367                                 "Quotacheck: Failed to reset quota flags.");
1368                 }
1369         } else
1370                 xfs_notice(mp, "Quotacheck: Done.");
1371         return error;
1372 }
1373
1374 /*
1375  * This is called from xfs_mountfs to start quotas and initialize all
1376  * necessary data structures like quotainfo.  This is also responsible for
1377  * running a quotacheck as necessary.  We are guaranteed that the superblock
1378  * is consistently read in at this point.
1379  *
1380  * If we fail here, the mount will continue with quota turned off. We don't
1381  * need to inidicate success or failure at all.
1382  */
1383 void
1384 xfs_qm_mount_quotas(
1385         struct xfs_mount        *mp)
1386 {
1387         int                     error = 0;
1388         uint                    sbf;
1389
1390         /*
1391          * If quotas on realtime volumes is not supported, we disable
1392          * quotas immediately.
1393          */
1394         if (mp->m_sb.sb_rextents) {
1395                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1396                 mp->m_qflags = 0;
1397                 goto write_changes;
1398         }
1399
1400         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1401
1402         /*
1403          * Allocate the quotainfo structure inside the mount struct, and
1404          * create quotainode(s), and change/rev superblock if necessary.
1405          */
1406         error = xfs_qm_init_quotainfo(mp);
1407         if (error) {
1408                 /*
1409                  * We must turn off quotas.
1410                  */
1411                 ASSERT(mp->m_quotainfo == NULL);
1412                 mp->m_qflags = 0;
1413                 goto write_changes;
1414         }
1415         /*
1416          * If any of the quotas are not consistent, do a quotacheck.
1417          */
1418         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1419                 error = xfs_qm_quotacheck(mp);
1420                 if (error) {
1421                         /* Quotacheck failed and disabled quotas. */
1422                         return;
1423                 }
1424         }
1425         /*
1426          * If one type of quotas is off, then it will lose its
1427          * quotachecked status, since we won't be doing accounting for
1428          * that type anymore.
1429          */
1430         if (!XFS_IS_UQUOTA_ON(mp))
1431                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1432         if (!XFS_IS_GQUOTA_ON(mp))
1433                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1434         if (!XFS_IS_PQUOTA_ON(mp))
1435                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1436
1437  write_changes:
1438         /*
1439          * We actually don't have to acquire the m_sb_lock at all.
1440          * This can only be called from mount, and that's single threaded. XXX
1441          */
1442         spin_lock(&mp->m_sb_lock);
1443         sbf = mp->m_sb.sb_qflags;
1444         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1445         spin_unlock(&mp->m_sb_lock);
1446
1447         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1448                 if (xfs_sync_sb(mp, false)) {
1449                         /*
1450                          * We could only have been turning quotas off.
1451                          * We aren't in very good shape actually because
1452                          * the incore structures are convinced that quotas are
1453                          * off, but the on disk superblock doesn't know that !
1454                          */
1455                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1456                         xfs_alert(mp, "%s: Superblock update failed!",
1457                                 __func__);
1458                 }
1459         }
1460
1461         if (error) {
1462                 xfs_warn(mp, "Failed to initialize disk quotas.");
1463                 return;
1464         }
1465 }
1466
1467 /*
1468  * This is called after the superblock has been read in and we're ready to
1469  * iget the quota inodes.
1470  */
1471 STATIC int
1472 xfs_qm_init_quotainos(
1473         xfs_mount_t     *mp)
1474 {
1475         struct xfs_inode        *uip = NULL;
1476         struct xfs_inode        *gip = NULL;
1477         struct xfs_inode        *pip = NULL;
1478         int                     error;
1479         uint                    flags = 0;
1480
1481         ASSERT(mp->m_quotainfo);
1482
1483         /*
1484          * Get the uquota and gquota inodes
1485          */
1486         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1487                 if (XFS_IS_UQUOTA_ON(mp) &&
1488                     mp->m_sb.sb_uquotino != NULLFSINO) {
1489                         ASSERT(mp->m_sb.sb_uquotino > 0);
1490                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1491                                              0, 0, &uip);
1492                         if (error)
1493                                 return error;
1494                 }
1495                 if (XFS_IS_GQUOTA_ON(mp) &&
1496                     mp->m_sb.sb_gquotino != NULLFSINO) {
1497                         ASSERT(mp->m_sb.sb_gquotino > 0);
1498                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1499                                              0, 0, &gip);
1500                         if (error)
1501                                 goto error_rele;
1502                 }
1503                 if (XFS_IS_PQUOTA_ON(mp) &&
1504                     mp->m_sb.sb_pquotino != NULLFSINO) {
1505                         ASSERT(mp->m_sb.sb_pquotino > 0);
1506                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1507                                              0, 0, &pip);
1508                         if (error)
1509                                 goto error_rele;
1510                 }
1511         } else {
1512                 flags |= XFS_QMOPT_SBVERSION;
1513         }
1514
1515         /*
1516          * Create the three inodes, if they don't exist already. The changes
1517          * made above will get added to a transaction and logged in one of
1518          * the qino_alloc calls below.  If the device is readonly,
1519          * temporarily switch to read-write to do this.
1520          */
1521         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1522                 error = xfs_qm_qino_alloc(mp, &uip,
1523                                               flags | XFS_QMOPT_UQUOTA);
1524                 if (error)
1525                         goto error_rele;
1526
1527                 flags &= ~XFS_QMOPT_SBVERSION;
1528         }
1529         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1530                 error = xfs_qm_qino_alloc(mp, &gip,
1531                                           flags | XFS_QMOPT_GQUOTA);
1532                 if (error)
1533                         goto error_rele;
1534
1535                 flags &= ~XFS_QMOPT_SBVERSION;
1536         }
1537         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1538                 error = xfs_qm_qino_alloc(mp, &pip,
1539                                           flags | XFS_QMOPT_PQUOTA);
1540                 if (error)
1541                         goto error_rele;
1542         }
1543
1544         mp->m_quotainfo->qi_uquotaip = uip;
1545         mp->m_quotainfo->qi_gquotaip = gip;
1546         mp->m_quotainfo->qi_pquotaip = pip;
1547
1548         return 0;
1549
1550 error_rele:
1551         if (uip)
1552                 IRELE(uip);
1553         if (gip)
1554                 IRELE(gip);
1555         if (pip)
1556                 IRELE(pip);
1557         return error;
1558 }
1559
1560 STATIC void
1561 xfs_qm_destroy_quotainos(
1562         xfs_quotainfo_t *qi)
1563 {
1564         if (qi->qi_uquotaip) {
1565                 IRELE(qi->qi_uquotaip);
1566                 qi->qi_uquotaip = NULL; /* paranoia */
1567         }
1568         if (qi->qi_gquotaip) {
1569                 IRELE(qi->qi_gquotaip);
1570                 qi->qi_gquotaip = NULL;
1571         }
1572         if (qi->qi_pquotaip) {
1573                 IRELE(qi->qi_pquotaip);
1574                 qi->qi_pquotaip = NULL;
1575         }
1576 }
1577
1578 STATIC void
1579 xfs_qm_dqfree_one(
1580         struct xfs_dquot        *dqp)
1581 {
1582         struct xfs_mount        *mp = dqp->q_mount;
1583         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1584
1585         mutex_lock(&qi->qi_tree_lock);
1586         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1587                           be32_to_cpu(dqp->q_core.d_id));
1588
1589         qi->qi_dquots--;
1590         mutex_unlock(&qi->qi_tree_lock);
1591
1592         xfs_qm_dqdestroy(dqp);
1593 }
1594
1595 /* --------------- utility functions for vnodeops ---------------- */
1596
1597
1598 /*
1599  * Given an inode, a uid, gid and prid make sure that we have
1600  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1601  * quotas by creating this file.
1602  * This also attaches dquot(s) to the given inode after locking it,
1603  * and returns the dquots corresponding to the uid and/or gid.
1604  *
1605  * in   : inode (unlocked)
1606  * out  : udquot, gdquot with references taken and unlocked
1607  */
1608 int
1609 xfs_qm_vop_dqalloc(
1610         struct xfs_inode        *ip,
1611         xfs_dqid_t              uid,
1612         xfs_dqid_t              gid,
1613         prid_t                  prid,
1614         uint                    flags,
1615         struct xfs_dquot        **O_udqpp,
1616         struct xfs_dquot        **O_gdqpp,
1617         struct xfs_dquot        **O_pdqpp)
1618 {
1619         struct xfs_mount        *mp = ip->i_mount;
1620         struct xfs_dquot        *uq = NULL;
1621         struct xfs_dquot        *gq = NULL;
1622         struct xfs_dquot        *pq = NULL;
1623         int                     error;
1624         uint                    lockflags;
1625
1626         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1627                 return 0;
1628
1629         lockflags = XFS_ILOCK_EXCL;
1630         xfs_ilock(ip, lockflags);
1631
1632         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1633                 gid = ip->i_d.di_gid;
1634
1635         /*
1636          * Attach the dquot(s) to this inode, doing a dquot allocation
1637          * if necessary. The dquot(s) will not be locked.
1638          */
1639         if (XFS_NOT_DQATTACHED(mp, ip)) {
1640                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1641                 if (error) {
1642                         xfs_iunlock(ip, lockflags);
1643                         return error;
1644                 }
1645         }
1646
1647         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1648                 if (ip->i_d.di_uid != uid) {
1649                         /*
1650                          * What we need is the dquot that has this uid, and
1651                          * if we send the inode to dqget, the uid of the inode
1652                          * takes priority over what's sent in the uid argument.
1653                          * We must unlock inode here before calling dqget if
1654                          * we're not sending the inode, because otherwise
1655                          * we'll deadlock by doing trans_reserve while
1656                          * holding ilock.
1657                          */
1658                         xfs_iunlock(ip, lockflags);
1659                         error = xfs_qm_dqget(mp, NULL, uid,
1660                                                  XFS_DQ_USER,
1661                                                  XFS_QMOPT_DQALLOC |
1662                                                  XFS_QMOPT_DOWARN,
1663                                                  &uq);
1664                         if (error) {
1665                                 ASSERT(error != -ENOENT);
1666                                 return error;
1667                         }
1668                         /*
1669                          * Get the ilock in the right order.
1670                          */
1671                         xfs_dqunlock(uq);
1672                         lockflags = XFS_ILOCK_SHARED;
1673                         xfs_ilock(ip, lockflags);
1674                 } else {
1675                         /*
1676                          * Take an extra reference, because we'll return
1677                          * this to caller
1678                          */
1679                         ASSERT(ip->i_udquot);
1680                         uq = xfs_qm_dqhold(ip->i_udquot);
1681                 }
1682         }
1683         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1684                 if (ip->i_d.di_gid != gid) {
1685                         xfs_iunlock(ip, lockflags);
1686                         error = xfs_qm_dqget(mp, NULL, gid,
1687                                                  XFS_DQ_GROUP,
1688                                                  XFS_QMOPT_DQALLOC |
1689                                                  XFS_QMOPT_DOWARN,
1690                                                  &gq);
1691                         if (error) {
1692                                 ASSERT(error != -ENOENT);
1693                                 goto error_rele;
1694                         }
1695                         xfs_dqunlock(gq);
1696                         lockflags = XFS_ILOCK_SHARED;
1697                         xfs_ilock(ip, lockflags);
1698                 } else {
1699                         ASSERT(ip->i_gdquot);
1700                         gq = xfs_qm_dqhold(ip->i_gdquot);
1701                 }
1702         }
1703         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1704                 if (xfs_get_projid(ip) != prid) {
1705                         xfs_iunlock(ip, lockflags);
1706                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1707                                                  XFS_DQ_PROJ,
1708                                                  XFS_QMOPT_DQALLOC |
1709                                                  XFS_QMOPT_DOWARN,
1710                                                  &pq);
1711                         if (error) {
1712                                 ASSERT(error != -ENOENT);
1713                                 goto error_rele;
1714                         }
1715                         xfs_dqunlock(pq);
1716                         lockflags = XFS_ILOCK_SHARED;
1717                         xfs_ilock(ip, lockflags);
1718                 } else {
1719                         ASSERT(ip->i_pdquot);
1720                         pq = xfs_qm_dqhold(ip->i_pdquot);
1721                 }
1722         }
1723         if (uq)
1724                 trace_xfs_dquot_dqalloc(ip);
1725
1726         xfs_iunlock(ip, lockflags);
1727         if (O_udqpp)
1728                 *O_udqpp = uq;
1729         else
1730                 xfs_qm_dqrele(uq);
1731         if (O_gdqpp)
1732                 *O_gdqpp = gq;
1733         else
1734                 xfs_qm_dqrele(gq);
1735         if (O_pdqpp)
1736                 *O_pdqpp = pq;
1737         else
1738                 xfs_qm_dqrele(pq);
1739         return 0;
1740
1741 error_rele:
1742         xfs_qm_dqrele(gq);
1743         xfs_qm_dqrele(uq);
1744         return error;
1745 }
1746
1747 /*
1748  * Actually transfer ownership, and do dquot modifications.
1749  * These were already reserved.
1750  */
1751 xfs_dquot_t *
1752 xfs_qm_vop_chown(
1753         xfs_trans_t     *tp,
1754         xfs_inode_t     *ip,
1755         xfs_dquot_t     **IO_olddq,
1756         xfs_dquot_t     *newdq)
1757 {
1758         xfs_dquot_t     *prevdq;
1759         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1760                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1761
1762
1763         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1764         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1765
1766         /* old dquot */
1767         prevdq = *IO_olddq;
1768         ASSERT(prevdq);
1769         ASSERT(prevdq != newdq);
1770
1771         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1772         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1773
1774         /* the sparkling new dquot */
1775         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1776         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1777
1778         /*
1779          * Take an extra reference, because the inode is going to keep
1780          * this dquot pointer even after the trans_commit.
1781          */
1782         *IO_olddq = xfs_qm_dqhold(newdq);
1783
1784         return prevdq;
1785 }
1786
1787 /*
1788  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1789  */
1790 int
1791 xfs_qm_vop_chown_reserve(
1792         struct xfs_trans        *tp,
1793         struct xfs_inode        *ip,
1794         struct xfs_dquot        *udqp,
1795         struct xfs_dquot        *gdqp,
1796         struct xfs_dquot        *pdqp,
1797         uint                    flags)
1798 {
1799         struct xfs_mount        *mp = ip->i_mount;
1800         uint                    delblks, blkflags, prjflags = 0;
1801         struct xfs_dquot        *udq_unres = NULL;
1802         struct xfs_dquot        *gdq_unres = NULL;
1803         struct xfs_dquot        *pdq_unres = NULL;
1804         struct xfs_dquot        *udq_delblks = NULL;
1805         struct xfs_dquot        *gdq_delblks = NULL;
1806         struct xfs_dquot        *pdq_delblks = NULL;
1807         int                     error;
1808
1809
1810         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1811         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1812
1813         delblks = ip->i_delayed_blks;
1814         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1815                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1816
1817         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1818             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1819                 udq_delblks = udqp;
1820                 /*
1821                  * If there are delayed allocation blocks, then we have to
1822                  * unreserve those from the old dquot, and add them to the
1823                  * new dquot.
1824                  */
1825                 if (delblks) {
1826                         ASSERT(ip->i_udquot);
1827                         udq_unres = ip->i_udquot;
1828                 }
1829         }
1830         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1831             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1832                 gdq_delblks = gdqp;
1833                 if (delblks) {
1834                         ASSERT(ip->i_gdquot);
1835                         gdq_unres = ip->i_gdquot;
1836                 }
1837         }
1838
1839         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1840             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1841                 prjflags = XFS_QMOPT_ENOSPC;
1842                 pdq_delblks = pdqp;
1843                 if (delblks) {
1844                         ASSERT(ip->i_pdquot);
1845                         pdq_unres = ip->i_pdquot;
1846                 }
1847         }
1848
1849         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1850                                 udq_delblks, gdq_delblks, pdq_delblks,
1851                                 ip->i_d.di_nblocks, 1,
1852                                 flags | blkflags | prjflags);
1853         if (error)
1854                 return error;
1855
1856         /*
1857          * Do the delayed blks reservations/unreservations now. Since, these
1858          * are done without the help of a transaction, if a reservation fails
1859          * its previous reservations won't be automatically undone by trans
1860          * code. So, we have to do it manually here.
1861          */
1862         if (delblks) {
1863                 /*
1864                  * Do the reservations first. Unreservation can't fail.
1865                  */
1866                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1867                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1868                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1869                             udq_delblks, gdq_delblks, pdq_delblks,
1870                             (xfs_qcnt_t)delblks, 0,
1871                             flags | blkflags | prjflags);
1872                 if (error)
1873                         return error;
1874                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1875                                 udq_unres, gdq_unres, pdq_unres,
1876                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1877         }
1878
1879         return 0;
1880 }
1881
1882 int
1883 xfs_qm_vop_rename_dqattach(
1884         struct xfs_inode        **i_tab)
1885 {
1886         struct xfs_mount        *mp = i_tab[0]->i_mount;
1887         int                     i;
1888
1889         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1890                 return 0;
1891
1892         for (i = 0; (i < 4 && i_tab[i]); i++) {
1893                 struct xfs_inode        *ip = i_tab[i];
1894                 int                     error;
1895
1896                 /*
1897                  * Watch out for duplicate entries in the table.
1898                  */
1899                 if (i == 0 || ip != i_tab[i-1]) {
1900                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1901                                 error = xfs_qm_dqattach(ip, 0);
1902                                 if (error)
1903                                         return error;
1904                         }
1905                 }
1906         }
1907         return 0;
1908 }
1909
1910 void
1911 xfs_qm_vop_create_dqattach(
1912         struct xfs_trans        *tp,
1913         struct xfs_inode        *ip,
1914         struct xfs_dquot        *udqp,
1915         struct xfs_dquot        *gdqp,
1916         struct xfs_dquot        *pdqp)
1917 {
1918         struct xfs_mount        *mp = tp->t_mountp;
1919
1920         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1921                 return;
1922
1923         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1924         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1925
1926         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1927                 ASSERT(ip->i_udquot == NULL);
1928                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1929
1930                 ip->i_udquot = xfs_qm_dqhold(udqp);
1931                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1932         }
1933         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1934                 ASSERT(ip->i_gdquot == NULL);
1935                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1936                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1937                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1938         }
1939         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1940                 ASSERT(ip->i_pdquot == NULL);
1941                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1942
1943                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1944                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1945         }
1946 }
1947