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_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_trans.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_alloc.h"
  26 #include "xfs_quota.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_ialloc_btree.h"
  30 #include "xfs_dinode.h"
  31 #include "xfs_inode.h"
  32 #include "xfs_ialloc.h"
  33 #include "xfs_itable.h"
  34 #include "xfs_rtalloc.h"
  35 #include "xfs_error.h"
  36 #include "xfs_bmap.h"
  37 #include "xfs_attr.h"
  38 #include "xfs_buf_item.h"
  39 #include "xfs_trans_space.h"
  40 #include "xfs_utils.h"
  41 #include "xfs_qm.h"
  42 #include "xfs_trace.h"
  43 #include "xfs_icache.h"
  44
  45 /*
  46  * The global quota manager. There is only one of these for the entire
  47  * system, _not_ one per file system. XQM keeps track of the overall
  48  * quota functionality, including maintaining the freelist and hash
  49  * tables of dquots.
  50  */
  51 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  52 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  53 STATIC int      xfs_qm_shake(struct shrinker *, struct shrink_control *);
  54
  55 /*
  56  * We use the batch lookup interface to iterate over the dquots as it
  57  * currently is the only interface into the radix tree code that allows
  58  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  59  * operations is fine as all callers are used either during mount/umount
  60  * or quotaoff.
  61  */
  62 #define XFS_DQ_LOOKUP_BATCH     32
  63
  64 STATIC int
  65 xfs_qm_dquot_walk(
  66         struct xfs_mount        *mp,
  67         int                     type,
  68         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  69         void                    *data)
  70 {
  71         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  72         struct radix_tree_root  *tree = XFS_DQUOT_TREE(qi, type);
  73         uint32_t                next_index;
  74         int                     last_error = 0;
  75         int                     skipped;
  76         int                     nr_found;
  77
  78 restart:
  79         skipped = 0;
  80         next_index = 0;
  81         nr_found = 0;
  82
  83         while (1) {
  84                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  85                 int             error = 0;
  86                 int             i;
  87
  88                 mutex_lock(&qi->qi_tree_lock);
  89                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  90                                         next_index, XFS_DQ_LOOKUP_BATCH);
  91                 if (!nr_found) {
  92                         mutex_unlock(&qi->qi_tree_lock);
  93                         break;
  94                 }
  95
  96                 for (i = 0; i < nr_found; i++) {
  97                         struct xfs_dquot *dqp = batch[i];
  98
  99                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
 100
 101                         error = execute(batch[i], data);
 102                         if (error == EAGAIN) {
 103                                 skipped++;
 104                                 continue;
 105                         }
 106                         if (error && last_error != EFSCORRUPTED)
 107                                 last_error = error;
 108                 }
 109
 110                 mutex_unlock(&qi->qi_tree_lock);
 111
 112                 /* bail out if the filesystem is corrupted.  */
 113                 if (last_error == EFSCORRUPTED) {
 114                         skipped = 0;
 115                         break;
 116                 }
 117         }
 118
 119         if (skipped) {
 120                 delay(1);
 121                 goto restart;
 122         }
 123
 124         return last_error;
 125 }
 126
 127
 128 /*
 129  * Purge a dquot from all tracking data structures and free it.
 130  */
 131 STATIC int
 132 xfs_qm_dqpurge(
 133         struct xfs_dquot        *dqp,
 134         void                    *data)
 135 {
 136         struct xfs_mount        *mp = dqp->q_mount;
 137         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 138         struct xfs_dquot        *gdqp = NULL;
 139
 140         xfs_dqlock(dqp);
 141         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 142                 xfs_dqunlock(dqp);
 143                 return EAGAIN;
 144         }
 145
 146         /*
 147          * If this quota has a group hint attached, prepare for releasing it
 148          * now.
 149          */
 150         gdqp = dqp->q_gdquot;
 151         if (gdqp) {
 152                 xfs_dqlock(gdqp);
 153                 dqp->q_gdquot = NULL;
 154         }
 155
 156         dqp->dq_flags |= XFS_DQ_FREEING;
 157
 158         xfs_dqflock(dqp);
 159
 160         /*
 161          * If we are turning this type of quotas off, we don't care
 162          * about the dirty metadata sitting in this dquot. OTOH, if
 163          * we're unmounting, we do care, so we flush it and wait.
 164          */
 165         if (XFS_DQ_IS_DIRTY(dqp)) {
 166                 struct xfs_buf  *bp = NULL;
 167                 int             error;
 168
 169                 /*
 170                  * We don't care about getting disk errors here. We need
 171                  * to purge this dquot anyway, so we go ahead regardless.
 172                  */
 173                 error = xfs_qm_dqflush(dqp, &bp);
 174                 if (error) {
 175                         xfs_warn(mp, "%s: dquot %p flush failed",
 176                                 __func__, dqp);
 177                 } else {
 178                         error = xfs_bwrite(bp);
 179                         xfs_buf_relse(bp);
 180                 }
 181                 xfs_dqflock(dqp);
 182         }
 183
 184         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 185         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 186                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 187
 188         xfs_dqfunlock(dqp);
 189         xfs_dqunlock(dqp);
 190
 191         radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
 192                           be32_to_cpu(dqp->q_core.d_id));
 193         qi->qi_dquots--;
 194
 195         /*
 196          * We move dquots to the freelist as soon as their reference count
 197          * hits zero, so it really should be on the freelist here.
 198          */
 199         mutex_lock(&qi->qi_lru_lock);
 200         ASSERT(!list_empty(&dqp->q_lru));
 201         list_del_init(&dqp->q_lru);
 202         qi->qi_lru_count--;
 203         XFS_STATS_DEC(xs_qm_dquot_unused);
 204         mutex_unlock(&qi->qi_lru_lock);
 205
 206         xfs_qm_dqdestroy(dqp);
 207
 208         if (gdqp)
 209                 xfs_qm_dqput(gdqp);
 210         return 0;
 211 }
 212
 213 /*
 214  * Purge the dquot cache.
 215  */
 216 void
 217 xfs_qm_dqpurge_all(
 218         struct xfs_mount        *mp,
 219         uint                    flags)
 220 {
 221         if (flags & XFS_QMOPT_UQUOTA)
 222                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 223         if (flags & XFS_QMOPT_GQUOTA)
 224                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 225         if (flags & XFS_QMOPT_PQUOTA)
 226                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 227 }
 228
 229 /*
 230  * Just destroy the quotainfo structure.
 231  */
 232 void
 233 xfs_qm_unmount(
 234         struct xfs_mount        *mp)
 235 {
 236         if (mp->m_quotainfo) {
 237                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 238                 xfs_qm_destroy_quotainfo(mp);
 239         }
 240 }
 241
 242
 243 /*
 244  * This is called from xfs_mountfs to start quotas and initialize all
 245  * necessary data structures like quotainfo.  This is also responsible for
 246  * running a quotacheck as necessary.  We are guaranteed that the superblock
 247  * is consistently read in at this point.
 248  *
 249  * If we fail here, the mount will continue with quota turned off. We don't
 250  * need to inidicate success or failure at all.
 251  */
 252 void
 253 xfs_qm_mount_quotas(
 254         xfs_mount_t     *mp)
 255 {
 256         int             error = 0;
 257         uint            sbf;
 258
 259         /*
 260          * If quotas on realtime volumes is not supported, we disable
 261          * quotas immediately.
 262          */
 263         if (mp->m_sb.sb_rextents) {
 264                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
 265                 mp->m_qflags = 0;
 266                 goto write_changes;
 267         }
 268
 269         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 270
 271         /*
 272          * Allocate the quotainfo structure inside the mount struct, and
 273          * create quotainode(s), and change/rev superblock if necessary.
 274          */
 275         error = xfs_qm_init_quotainfo(mp);
 276         if (error) {
 277                 /*
 278                  * We must turn off quotas.
 279                  */
 280                 ASSERT(mp->m_quotainfo == NULL);
 281                 mp->m_qflags = 0;
 282                 goto write_changes;
 283         }
 284         /*
 285          * If any of the quotas are not consistent, do a quotacheck.
 286          */
 287         if (XFS_QM_NEED_QUOTACHECK(mp)) {
 288                 error = xfs_qm_quotacheck(mp);
 289                 if (error) {
 290                         /* Quotacheck failed and disabled quotas. */
 291                         return;
 292                 }
 293         }
 294         /*
 295          * If one type of quotas is off, then it will lose its
 296          * quotachecked status, since we won't be doing accounting for
 297          * that type anymore.
 298          */
 299         if (!XFS_IS_UQUOTA_ON(mp))
 300                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
 301         if (!(XFS_IS_GQUOTA_ON(mp) || XFS_IS_PQUOTA_ON(mp)))
 302                 mp->m_qflags &= ~XFS_OQUOTA_CHKD;
 303
 304  write_changes:
 305         /*
 306          * We actually don't have to acquire the m_sb_lock at all.
 307          * This can only be called from mount, and that's single threaded. XXX
 308          */
 309         spin_lock(&mp->m_sb_lock);
 310         sbf = mp->m_sb.sb_qflags;
 311         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
 312         spin_unlock(&mp->m_sb_lock);
 313
 314         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
 315                 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
 316                         /*
 317                          * We could only have been turning quotas off.
 318                          * We aren't in very good shape actually because
 319                          * the incore structures are convinced that quotas are
 320                          * off, but the on disk superblock doesn't know that !
 321                          */
 322                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
 323                         xfs_alert(mp, "%s: Superblock update failed!",
 324                                 __func__);
 325                 }
 326         }
 327
 328         if (error) {
 329                 xfs_warn(mp, "Failed to initialize disk quotas.");
 330                 return;
 331         }
 332 }
 333
 334 /*
 335  * Called from the vfsops layer.
 336  */
 337 void
 338 xfs_qm_unmount_quotas(
 339         xfs_mount_t     *mp)
 340 {
 341         /*
 342          * Release the dquots that root inode, et al might be holding,
 343          * before we flush quotas and blow away the quotainfo structure.
 344          */
 345         ASSERT(mp->m_rootip);
 346         xfs_qm_dqdetach(mp->m_rootip);
 347         if (mp->m_rbmip)
 348                 xfs_qm_dqdetach(mp->m_rbmip);
 349         if (mp->m_rsumip)
 350                 xfs_qm_dqdetach(mp->m_rsumip);
 351
 352         /*
 353          * Release the quota inodes.
 354          */
 355         if (mp->m_quotainfo) {
 356                 if (mp->m_quotainfo->qi_uquotaip) {
 357                         IRELE(mp->m_quotainfo->qi_uquotaip);
 358                         mp->m_quotainfo->qi_uquotaip = NULL;
 359                 }
 360                 if (mp->m_quotainfo->qi_gquotaip) {
 361                         IRELE(mp->m_quotainfo->qi_gquotaip);
 362                         mp->m_quotainfo->qi_gquotaip = NULL;
 363                 }
 364         }
 365 }
 366
 367 STATIC int
 368 xfs_qm_dqattach_one(
 369         xfs_inode_t     *ip,
 370         xfs_dqid_t      id,
 371         uint            type,
 372         uint            doalloc,
 373         xfs_dquot_t     *udqhint, /* hint */
 374         xfs_dquot_t     **IO_idqpp)
 375 {
 376         xfs_dquot_t     *dqp;
 377         int             error;
 378
 379         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 380         error = 0;
 381
 382         /*
 383          * See if we already have it in the inode itself. IO_idqpp is
 384          * &i_udquot or &i_gdquot. This made the code look weird, but
 385          * made the logic a lot simpler.
 386          */
 387         dqp = *IO_idqpp;
 388         if (dqp) {
 389                 trace_xfs_dqattach_found(dqp);
 390                 return 0;
 391         }
 392
 393         /*
 394          * udqhint is the i_udquot field in inode, and is non-NULL only
 395          * when the type arg is group/project. Its purpose is to save a
 396          * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
 397          * the user dquot.
 398          */
 399         if (udqhint) {
 400                 ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 401                 xfs_dqlock(udqhint);
 402
 403                 /*
 404                  * No need to take dqlock to look at the id.
 405                  *
 406                  * The ID can't change until it gets reclaimed, and it won't
 407                  * be reclaimed as long as we have a ref from inode and we
 408                  * hold the ilock.
 409                  */
 410                 dqp = udqhint->q_gdquot;
 411                 if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
 412                         ASSERT(*IO_idqpp == NULL);
 413
 414                         *IO_idqpp = xfs_qm_dqhold(dqp);
 415                         xfs_dqunlock(udqhint);
 416                         return 0;
 417                 }
 418
 419                 /*
 420                  * We can't hold a dquot lock when we call the dqget code.
 421                  * We'll deadlock in no time, because of (not conforming to)
 422                  * lock ordering - the inodelock comes before any dquot lock,
 423                  * and we may drop and reacquire the ilock in xfs_qm_dqget().
 424                  */
 425                 xfs_dqunlock(udqhint);
 426         }
 427
 428         /*
 429          * Find the dquot from somewhere. This bumps the
 430          * reference count of dquot and returns it locked.
 431          * This can return ENOENT if dquot didn't exist on
 432          * disk and we didn't ask it to allocate;
 433          * ESRCH if quotas got turned off suddenly.
 434          */
 435         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 436                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 437         if (error)
 438                 return error;
 439
 440         trace_xfs_dqattach_get(dqp);
 441
 442         /*
 443          * dqget may have dropped and re-acquired the ilock, but it guarantees
 444          * that the dquot returned is the one that should go in the inode.
 445          */
 446         *IO_idqpp = dqp;
 447         xfs_dqunlock(dqp);
 448         return 0;
 449 }
 450
 451
 452 /*
 453  * Given a udquot and gdquot, attach a ptr to the group dquot in the
 454  * udquot as a hint for future lookups.
 455  */
 456 STATIC void
 457 xfs_qm_dqattach_grouphint(
 458         xfs_dquot_t     *udq,
 459         xfs_dquot_t     *gdq)
 460 {
 461         xfs_dquot_t     *tmp;
 462
 463         xfs_dqlock(udq);
 464
 465         tmp = udq->q_gdquot;
 466         if (tmp) {
 467                 if (tmp == gdq)
 468                         goto done;
 469
 470                 udq->q_gdquot = NULL;
 471                 xfs_qm_dqrele(tmp);
 472         }
 473
 474         udq->q_gdquot = xfs_qm_dqhold(gdq);
 475 done:
 476         xfs_dqunlock(udq);
 477 }
 478
 479 static bool
 480 xfs_qm_need_dqattach(
 481         struct xfs_inode        *ip)
 482 {
 483         struct xfs_mount        *mp = ip->i_mount;
 484
 485         if (!XFS_IS_QUOTA_RUNNING(mp))
 486                 return false;
 487         if (!XFS_IS_QUOTA_ON(mp))
 488                 return false;
 489         if (!XFS_NOT_DQATTACHED(mp, ip))
 490                 return false;
 491         if (ip->i_ino == mp->m_sb.sb_uquotino ||
 492             ip->i_ino == mp->m_sb.sb_gquotino)
 493                 return false;
 494         return true;
 495 }
 496
 497 /*
 498  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 499  * into account.
 500  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 501  * Inode may get unlocked and relocked in here, and the caller must deal with
 502  * the consequences.
 503  */
 504 int
 505 xfs_qm_dqattach_locked(
 506         xfs_inode_t     *ip,
 507         uint            flags)
 508 {
 509         xfs_mount_t     *mp = ip->i_mount;
 510         uint            nquotas = 0;
 511         int             error = 0;
 512
 513         if (!xfs_qm_need_dqattach(ip))
 514                 return 0;
 515
 516         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 517
 518         if (XFS_IS_UQUOTA_ON(mp)) {
 519                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 520                                                 flags & XFS_QMOPT_DQALLOC,
 521                                                 NULL, &ip->i_udquot);
 522                 if (error)
 523                         goto done;
 524                 nquotas++;
 525         }
 526
 527         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 528         if (XFS_IS_OQUOTA_ON(mp)) {
 529                 error = XFS_IS_GQUOTA_ON(mp) ?
 530                         xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 531                                                 flags & XFS_QMOPT_DQALLOC,
 532                                                 ip->i_udquot, &ip->i_gdquot) :
 533                         xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 534                                                 flags & XFS_QMOPT_DQALLOC,
 535                                                 ip->i_udquot, &ip->i_gdquot);
 536                 /*
 537                  * Don't worry about the udquot that we may have
 538                  * attached above. It'll get detached, if not already.
 539                  */
 540                 if (error)
 541                         goto done;
 542                 nquotas++;
 543         }
 544
 545         /*
 546          * Attach this group quota to the user quota as a hint.
 547          * This WON'T, in general, result in a thrash.
 548          */
 549         if (nquotas == 2) {
 550                 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 551                 ASSERT(ip->i_udquot);
 552                 ASSERT(ip->i_gdquot);
 553
 554                 /*
 555                  * We do not have i_udquot locked at this point, but this check
 556                  * is OK since we don't depend on the i_gdquot to be accurate
 557                  * 100% all the time. It is just a hint, and this will
 558                  * succeed in general.
 559                  */
 560                 if (ip->i_udquot->q_gdquot != ip->i_gdquot)
 561                         xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
 562         }
 563
 564  done:
 565 #ifdef DEBUG
 566         if (!error) {
 567                 if (XFS_IS_UQUOTA_ON(mp))
 568                         ASSERT(ip->i_udquot);
 569                 if (XFS_IS_OQUOTA_ON(mp))
 570                         ASSERT(ip->i_gdquot);
 571         }
 572         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 573 #endif
 574         return error;
 575 }
 576
 577 int
 578 xfs_qm_dqattach(
 579         struct xfs_inode        *ip,
 580         uint                    flags)
 581 {
 582         int                     error;
 583
 584         if (!xfs_qm_need_dqattach(ip))
 585                 return 0;
 586
 587         xfs_ilock(ip, XFS_ILOCK_EXCL);
 588         error = xfs_qm_dqattach_locked(ip, flags);
 589         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 590
 591         return error;
 592 }
 593
 594 /*
 595  * Release dquots (and their references) if any.
 596  * The inode should be locked EXCL except when this's called by
 597  * xfs_ireclaim.
 598  */
 599 void
 600 xfs_qm_dqdetach(
 601         xfs_inode_t     *ip)
 602 {
 603         if (!(ip->i_udquot || ip->i_gdquot))
 604                 return;
 605
 606         trace_xfs_dquot_dqdetach(ip);
 607
 608         ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
 609         ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
 610         if (ip->i_udquot) {
 611                 xfs_qm_dqrele(ip->i_udquot);
 612                 ip->i_udquot = NULL;
 613         }
 614         if (ip->i_gdquot) {
 615                 xfs_qm_dqrele(ip->i_gdquot);
 616                 ip->i_gdquot = NULL;
 617         }
 618 }
 619
 620 /*
 621  * This initializes all the quota information that's kept in the
 622  * mount structure
 623  */
 624 STATIC int
 625 xfs_qm_init_quotainfo(
 626         xfs_mount_t     *mp)
 627 {
 628         xfs_quotainfo_t *qinf;
 629         int             error;
 630         xfs_dquot_t     *dqp;
 631
 632         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 633
 634         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 635
 636         /*
 637          * See if quotainodes are setup, and if not, allocate them,
 638          * and change the superblock accordingly.
 639          */
 640         if ((error = xfs_qm_init_quotainos(mp))) {
 641                 kmem_free(qinf);
 642                 mp->m_quotainfo = NULL;
 643                 return error;
 644         }
 645
 646         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 647         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 648         mutex_init(&qinf->qi_tree_lock);
 649
 650         INIT_LIST_HEAD(&qinf->qi_lru_list);
 651         qinf->qi_lru_count = 0;
 652         mutex_init(&qinf->qi_lru_lock);
 653
 654         /* mutex used to serialize quotaoffs */
 655         mutex_init(&qinf->qi_quotaofflock);
 656
 657         /* Precalc some constants */
 658         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 659         ASSERT(qinf->qi_dqchunklen);
 660         qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
 661         do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
 662
 663         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 664
 665         /*
 666          * We try to get the limits from the superuser's limits fields.
 667          * This is quite hacky, but it is standard quota practice.
 668          *
 669          * We look at the USR dquot with id == 0 first, but if user quotas
 670          * are not enabled we goto the GRP dquot with id == 0.
 671          * We don't really care to keep separate default limits for user
 672          * and group quotas, at least not at this point.
 673          *
 674          * Since we may not have done a quotacheck by this point, just read
 675          * the dquot without attaching it to any hashtables or lists.
 676          */
 677         error = xfs_qm_dqread(mp, 0,
 678                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 679                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 680                           XFS_DQ_PROJ),
 681                         XFS_QMOPT_DOWARN, &dqp);
 682         if (!error) {
 683                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 684
 685                 /*
 686                  * The warnings and timers set the grace period given to
 687                  * a user or group before he or she can not perform any
 688                  * more writing. If it is zero, a default is used.
 689                  */
 690                 qinf->qi_btimelimit = ddqp->d_btimer ?
 691                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 692                 qinf->qi_itimelimit = ddqp->d_itimer ?
 693                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 694                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 695                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 696                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 697                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 698                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 699                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 700                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 701                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 702                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 703                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 704                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 705                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 706                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 707                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 708
 709                 xfs_qm_dqdestroy(dqp);
 710         } else {
 711                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 712                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 713                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 714                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 715                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 716                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 717         }
 718
 719         qinf->qi_shrinker.shrink = xfs_qm_shake;
 720         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 721         register_shrinker(&qinf->qi_shrinker);
 722         return 0;
 723 }
 724
 725
 726 /*
 727  * Gets called when unmounting a filesystem or when all quotas get
 728  * turned off.
 729  * This purges the quota inodes, destroys locks and frees itself.
 730  */
 731 void
 732 xfs_qm_destroy_quotainfo(
 733         xfs_mount_t     *mp)
 734 {
 735         xfs_quotainfo_t *qi;
 736
 737         qi = mp->m_quotainfo;
 738         ASSERT(qi != NULL);
 739
 740         unregister_shrinker(&qi->qi_shrinker);
 741
 742         if (qi->qi_uquotaip) {
 743                 IRELE(qi->qi_uquotaip);
 744                 qi->qi_uquotaip = NULL; /* paranoia */
 745         }
 746         if (qi->qi_gquotaip) {
 747                 IRELE(qi->qi_gquotaip);
 748                 qi->qi_gquotaip = NULL;
 749         }
 750         mutex_destroy(&qi->qi_quotaofflock);
 751         kmem_free(qi);
 752         mp->m_quotainfo = NULL;
 753 }
 754
 755 /*
 756  * Create an inode and return with a reference already taken, but unlocked
 757  * This is how we create quota inodes
 758  */
 759 STATIC int
 760 xfs_qm_qino_alloc(
 761         xfs_mount_t     *mp,
 762         xfs_inode_t     **ip,
 763         __int64_t       sbfields,
 764         uint            flags)
 765 {
 766         xfs_trans_t     *tp;
 767         int             error;
 768         int             committed;
 769
 770         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 771         if ((error = xfs_trans_reserve(tp,
 772                                       XFS_QM_QINOCREATE_SPACE_RES(mp),
 773                                       XFS_CREATE_LOG_RES(mp), 0,
 774                                       XFS_TRANS_PERM_LOG_RES,
 775                                       XFS_CREATE_LOG_COUNT))) {
 776                 xfs_trans_cancel(tp, 0);
 777                 return error;
 778         }
 779
 780         error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 781         if (error) {
 782                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 783                                  XFS_TRANS_ABORT);
 784                 return error;
 785         }
 786
 787         /*
 788          * Make the changes in the superblock, and log those too.
 789          * sbfields arg may contain fields other than *QUOTINO;
 790          * VERSIONNUM for example.
 791          */
 792         spin_lock(&mp->m_sb_lock);
 793         if (flags & XFS_QMOPT_SBVERSION) {
 794                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 795                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 796                                    XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 797                        (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 798                         XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 799
 800                 xfs_sb_version_addquota(&mp->m_sb);
 801                 mp->m_sb.sb_uquotino = NULLFSINO;
 802                 mp->m_sb.sb_gquotino = NULLFSINO;
 803
 804                 /* qflags will get updated _after_ quotacheck */
 805                 mp->m_sb.sb_qflags = 0;
 806         }
 807         if (flags & XFS_QMOPT_UQUOTA)
 808                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 809         else
 810                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 811         spin_unlock(&mp->m_sb_lock);
 812         xfs_mod_sb(tp, sbfields);
 813
 814         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 815                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 816                 return error;
 817         }
 818         return 0;
 819 }
 820
 821
 822 STATIC void
 823 xfs_qm_reset_dqcounts(
 824         xfs_mount_t     *mp,
 825         xfs_buf_t       *bp,
 826         xfs_dqid_t      id,
 827         uint            type)
 828 {
 829         xfs_disk_dquot_t        *ddq;
 830         int                     j;
 831
 832         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 833
 834         /*
 835          * Reset all counters and timers. They'll be
 836          * started afresh by xfs_qm_quotacheck.
 837          */
 838 #ifdef DEBUG
 839         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 840         do_div(j, sizeof(xfs_dqblk_t));
 841         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 842 #endif
 843         ddq = bp->b_addr;
 844         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 845                 /*
 846                  * Do a sanity check, and if needed, repair the dqblk. Don't
 847                  * output any warnings because it's perfectly possible to
 848                  * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 849                  */
 850                 (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 851                                       "xfs_quotacheck");
 852                 ddq->d_bcount = 0;
 853                 ddq->d_icount = 0;
 854                 ddq->d_rtbcount = 0;
 855                 ddq->d_btimer = 0;
 856                 ddq->d_itimer = 0;
 857                 ddq->d_rtbtimer = 0;
 858                 ddq->d_bwarns = 0;
 859                 ddq->d_iwarns = 0;
 860                 ddq->d_rtbwarns = 0;
 861                 ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
 862         }
 863 }
 864
 865 STATIC int
 866 xfs_qm_dqiter_bufs(
 867         struct xfs_mount        *mp,
 868         xfs_dqid_t              firstid,
 869         xfs_fsblock_t           bno,
 870         xfs_filblks_t           blkcnt,
 871         uint                    flags,
 872         struct list_head        *buffer_list)
 873 {
 874         struct xfs_buf          *bp;
 875         int                     error;
 876         int                     type;
 877
 878         ASSERT(blkcnt > 0);
 879         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 880                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 881         error = 0;
 882
 883         /*
 884          * Blkcnt arg can be a very big number, and might even be
 885          * larger than the log itself. So, we have to break it up into
 886          * manageable-sized transactions.
 887          * Note that we don't start a permanent transaction here; we might
 888          * not be able to get a log reservation for the whole thing up front,
 889          * and we don't really care to either, because we just discard
 890          * everything if we were to crash in the middle of this loop.
 891          */
 892         while (blkcnt--) {
 893                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 894                               XFS_FSB_TO_DADDR(mp, bno),
 895                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 896                               &xfs_dquot_buf_ops);
 897                 if (error)
 898                         break;
 899
 900                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 901                 xfs_buf_delwri_queue(bp, buffer_list);
 902                 xfs_buf_relse(bp);
 903                 /*
 904                  * goto the next block.
 905                  */
 906                 bno++;
 907                 firstid += mp->m_quotainfo->qi_dqperchunk;
 908         }
 909
 910         return error;
 911 }
 912
 913 /*
 914  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 915  * caller supplied function for every chunk of dquots that we find.
 916  */
 917 STATIC int
 918 xfs_qm_dqiterate(
 919         struct xfs_mount        *mp,
 920         struct xfs_inode        *qip,
 921         uint                    flags,
 922         struct list_head        *buffer_list)
 923 {
 924         struct xfs_bmbt_irec    *map;
 925         int                     i, nmaps;       /* number of map entries */
 926         int                     error;          /* return value */
 927         xfs_fileoff_t           lblkno;
 928         xfs_filblks_t           maxlblkcnt;
 929         xfs_dqid_t              firstid;
 930         xfs_fsblock_t           rablkno;
 931         xfs_filblks_t           rablkcnt;
 932
 933         error = 0;
 934         /*
 935          * This looks racy, but we can't keep an inode lock across a
 936          * trans_reserve. But, this gets called during quotacheck, and that
 937          * happens only at mount time which is single threaded.
 938          */
 939         if (qip->i_d.di_nblocks == 0)
 940                 return 0;
 941
 942         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 943
 944         lblkno = 0;
 945         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 946         do {
 947                 nmaps = XFS_DQITER_MAP_SIZE;
 948                 /*
 949                  * We aren't changing the inode itself. Just changing
 950                  * some of its data. No new blocks are added here, and
 951                  * the inode is never added to the transaction.
 952                  */
 953                 xfs_ilock(qip, XFS_ILOCK_SHARED);
 954                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 955                                        map, &nmaps, 0);
 956                 xfs_iunlock(qip, XFS_ILOCK_SHARED);
 957                 if (error)
 958                         break;
 959
 960                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 961                 for (i = 0; i < nmaps; i++) {
 962                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 963                         ASSERT(map[i].br_blockcount);
 964
 965
 966                         lblkno += map[i].br_blockcount;
 967
 968                         if (map[i].br_startblock == HOLESTARTBLOCK)
 969                                 continue;
 970
 971                         firstid = (xfs_dqid_t) map[i].br_startoff *
 972                                 mp->m_quotainfo->qi_dqperchunk;
 973                         /*
 974                          * Do a read-ahead on the next extent.
 975                          */
 976                         if ((i+1 < nmaps) &&
 977                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 978                                 rablkcnt =  map[i+1].br_blockcount;
 979                                 rablkno = map[i+1].br_startblock;
 980                                 while (rablkcnt--) {
 981                                         xfs_buf_readahead(mp->m_ddev_targp,
 982                                                XFS_FSB_TO_DADDR(mp, rablkno),
 983                                                mp->m_quotainfo->qi_dqchunklen,
 984                                                NULL);
 985                                         rablkno++;
 986                                 }
 987                         }
 988                         /*
 989                          * Iterate thru all the blks in the extent and
 990                          * reset the counters of all the dquots inside them.
 991                          */
 992                         error = xfs_qm_dqiter_bufs(mp, firstid,
 993                                                    map[i].br_startblock,
 994                                                    map[i].br_blockcount,
 995                                                    flags, buffer_list);
 996                         if (error)
 997                                 goto out;
 998                 }
 999         } while (nmaps > 0);
1000
1001 out:
1002         kmem_free(map);
1003         return error;
1004 }
1005
1006 /*
1007  * Called by dqusage_adjust in doing a quotacheck.
1008  *
1009  * Given the inode, and a dquot id this updates both the incore dqout as well
1010  * as the buffer copy. This is so that once the quotacheck is done, we can
1011  * just log all the buffers, as opposed to logging numerous updates to
1012  * individual dquots.
1013  */
1014 STATIC int
1015 xfs_qm_quotacheck_dqadjust(
1016         struct xfs_inode        *ip,
1017         xfs_dqid_t              id,
1018         uint                    type,
1019         xfs_qcnt_t              nblks,
1020         xfs_qcnt_t              rtblks)
1021 {
1022         struct xfs_mount        *mp = ip->i_mount;
1023         struct xfs_dquot        *dqp;
1024         int                     error;
1025
1026         error = xfs_qm_dqget(mp, ip, id, type,
1027                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1028         if (error) {
1029                 /*
1030                  * Shouldn't be able to turn off quotas here.
1031                  */
1032                 ASSERT(error != ESRCH);
1033                 ASSERT(error != ENOENT);
1034                 return error;
1035         }
1036
1037         trace_xfs_dqadjust(dqp);
1038
1039         /*
1040          * Adjust the inode count and the block count to reflect this inode's
1041          * resource usage.
1042          */
1043         be64_add_cpu(&dqp->q_core.d_icount, 1);
1044         dqp->q_res_icount++;
1045         if (nblks) {
1046                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1047                 dqp->q_res_bcount += nblks;
1048         }
1049         if (rtblks) {
1050                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1051                 dqp->q_res_rtbcount += rtblks;
1052         }
1053
1054         /*
1055          * Set default limits, adjust timers (since we changed usages)
1056          *
1057          * There are no timers for the default values set in the root dquot.
1058          */
1059         if (dqp->q_core.d_id) {
1060                 xfs_qm_adjust_dqlimits(mp, &dqp->q_core);
1061                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1062         }
1063
1064         dqp->dq_flags |= XFS_DQ_DIRTY;
1065         xfs_qm_dqput(dqp);
1066         return 0;
1067 }
1068
1069 STATIC int
1070 xfs_qm_get_rtblks(
1071         xfs_inode_t     *ip,
1072         xfs_qcnt_t      *O_rtblks)
1073 {
1074         xfs_filblks_t   rtblks;                 /* total rt blks */
1075         xfs_extnum_t    idx;                    /* extent record index */
1076         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1077         xfs_extnum_t    nextents;               /* number of extent entries */
1078         int             error;
1079
1080         ASSERT(XFS_IS_REALTIME_INODE(ip));
1081         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1082         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1083                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1084                         return error;
1085         }
1086         rtblks = 0;
1087         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1088         for (idx = 0; idx < nextents; idx++)
1089                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1090         *O_rtblks = (xfs_qcnt_t)rtblks;
1091         return 0;
1092 }
1093
1094 /*
1095  * callback routine supplied to bulkstat(). Given an inumber, find its
1096  * dquots and update them to account for resources taken by that inode.
1097  */
1098 /* ARGSUSED */
1099 STATIC int
1100 xfs_qm_dqusage_adjust(
1101         xfs_mount_t     *mp,            /* mount point for filesystem */
1102         xfs_ino_t       ino,            /* inode number to get data for */
1103         void            __user *buffer, /* not used */
1104         int             ubsize,         /* not used */
1105         int             *ubused,        /* not used */
1106         int             *res)           /* result code value */
1107 {
1108         xfs_inode_t     *ip;
1109         xfs_qcnt_t      nblks, rtblks = 0;
1110         int             error;
1111
1112         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1113
1114         /*
1115          * rootino must have its resources accounted for, not so with the quota
1116          * inodes.
1117          */
1118         if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1119                 *res = BULKSTAT_RV_NOTHING;
1120                 return XFS_ERROR(EINVAL);
1121         }
1122
1123         /*
1124          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1125          * interface expects the inode to be exclusively locked because that's
1126          * the case in all other instances. It's OK that we do this because
1127          * quotacheck is done only at mount time.
1128          */
1129         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1130         if (error) {
1131                 *res = BULKSTAT_RV_NOTHING;
1132                 return error;
1133         }
1134
1135         ASSERT(ip->i_delayed_blks == 0);
1136
1137         if (XFS_IS_REALTIME_INODE(ip)) {
1138                 /*
1139                  * Walk thru the extent list and count the realtime blocks.
1140                  */
1141                 error = xfs_qm_get_rtblks(ip, &rtblks);
1142                 if (error)
1143                         goto error0;
1144         }
1145
1146         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1147
1148         /*
1149          * Add the (disk blocks and inode) resources occupied by this
1150          * inode to its dquots. We do this adjustment in the incore dquot,
1151          * and also copy the changes to its buffer.
1152          * We don't care about putting these changes in a transaction
1153          * envelope because if we crash in the middle of a 'quotacheck'
1154          * we have to start from the beginning anyway.
1155          * Once we're done, we'll log all the dquot bufs.
1156          *
1157          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1158          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1159          */
1160         if (XFS_IS_UQUOTA_ON(mp)) {
1161                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1162                                                    XFS_DQ_USER, nblks, rtblks);
1163                 if (error)
1164                         goto error0;
1165         }
1166
1167         if (XFS_IS_GQUOTA_ON(mp)) {
1168                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1169                                                    XFS_DQ_GROUP, nblks, rtblks);
1170                 if (error)
1171                         goto error0;
1172         }
1173
1174         if (XFS_IS_PQUOTA_ON(mp)) {
1175                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1176                                                    XFS_DQ_PROJ, nblks, rtblks);
1177                 if (error)
1178                         goto error0;
1179         }
1180
1181         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1182         IRELE(ip);
1183         *res = BULKSTAT_RV_DIDONE;
1184         return 0;
1185
1186 error0:
1187         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1188         IRELE(ip);
1189         *res = BULKSTAT_RV_GIVEUP;
1190         return error;
1191 }
1192
1193 STATIC int
1194 xfs_qm_flush_one(
1195         struct xfs_dquot        *dqp,
1196         void                    *data)
1197 {
1198         struct list_head        *buffer_list = data;
1199         struct xfs_buf          *bp = NULL;
1200         int                     error = 0;
1201
1202         xfs_dqlock(dqp);
1203         if (dqp->dq_flags & XFS_DQ_FREEING)
1204                 goto out_unlock;
1205         if (!XFS_DQ_IS_DIRTY(dqp))
1206                 goto out_unlock;
1207
1208         xfs_dqflock(dqp);
1209         error = xfs_qm_dqflush(dqp, &bp);
1210         if (error)
1211                 goto out_unlock;
1212
1213         xfs_buf_delwri_queue(bp, buffer_list);
1214         xfs_buf_relse(bp);
1215 out_unlock:
1216         xfs_dqunlock(dqp);
1217         return error;
1218 }
1219
1220 /*
1221  * Walk thru all the filesystem inodes and construct a consistent view
1222  * of the disk quota world. If the quotacheck fails, disable quotas.
1223  */
1224 int
1225 xfs_qm_quotacheck(
1226         xfs_mount_t     *mp)
1227 {
1228         int             done, count, error, error2;
1229         xfs_ino_t       lastino;
1230         size_t          structsz;
1231         xfs_inode_t     *uip, *gip;
1232         uint            flags;
1233         LIST_HEAD       (buffer_list);
1234
1235         count = INT_MAX;
1236         structsz = 1;
1237         lastino = 0;
1238         flags = 0;
1239
1240         ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1241         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1242
1243         xfs_notice(mp, "Quotacheck needed: Please wait.");
1244
1245         /*
1246          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1247          * their counters to zero. We need a clean slate.
1248          * We don't log our changes till later.
1249          */
1250         uip = mp->m_quotainfo->qi_uquotaip;
1251         if (uip) {
1252                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1253                                          &buffer_list);
1254                 if (error)
1255                         goto error_return;
1256                 flags |= XFS_UQUOTA_CHKD;
1257         }
1258
1259         gip = mp->m_quotainfo->qi_gquotaip;
1260         if (gip) {
1261                 error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1262                                          XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA,
1263                                          &buffer_list);
1264                 if (error)
1265                         goto error_return;
1266                 flags |= XFS_OQUOTA_CHKD;
1267         }
1268
1269         do {
1270                 /*
1271                  * Iterate thru all the inodes in the file system,
1272                  * adjusting the corresponding dquot counters in core.
1273                  */
1274                 error = xfs_bulkstat(mp, &lastino, &count,
1275                                      xfs_qm_dqusage_adjust,
1276                                      structsz, NULL, &done);
1277                 if (error)
1278                         break;
1279
1280         } while (!done);
1281
1282         /*
1283          * We've made all the changes that we need to make incore.  Flush them
1284          * down to disk buffers if everything was updated successfully.
1285          */
1286         if (XFS_IS_UQUOTA_ON(mp)) {
1287                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1288                                           &buffer_list);
1289         }
1290         if (XFS_IS_GQUOTA_ON(mp)) {
1291                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1292                                            &buffer_list);
1293                 if (!error)
1294                         error = error2;
1295         }
1296         if (XFS_IS_PQUOTA_ON(mp)) {
1297                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1298                                            &buffer_list);
1299                 if (!error)
1300                         error = error2;
1301         }
1302
1303         error2 = xfs_buf_delwri_submit(&buffer_list);
1304         if (!error)
1305                 error = error2;
1306
1307         /*
1308          * We can get this error if we couldn't do a dquot allocation inside
1309          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1310          * dirty dquots that might be cached, we just want to get rid of them
1311          * and turn quotaoff. The dquots won't be attached to any of the inodes
1312          * at this point (because we intentionally didn't in dqget_noattach).
1313          */
1314         if (error) {
1315                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1316                 goto error_return;
1317         }
1318
1319         /*
1320          * If one type of quotas is off, then it will lose its
1321          * quotachecked status, since we won't be doing accounting for
1322          * that type anymore.
1323          */
1324         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1325         mp->m_qflags |= flags;
1326
1327  error_return:
1328         while (!list_empty(&buffer_list)) {
1329                 struct xfs_buf *bp =
1330                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1331                 list_del_init(&bp->b_list);
1332                 xfs_buf_relse(bp);
1333         }
1334
1335         if (error) {
1336                 xfs_warn(mp,
1337         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1338                         error);
1339                 /*
1340                  * We must turn off quotas.
1341                  */
1342                 ASSERT(mp->m_quotainfo != NULL);
1343                 xfs_qm_destroy_quotainfo(mp);
1344                 if (xfs_mount_reset_sbqflags(mp)) {
1345                         xfs_warn(mp,
1346                                 "Quotacheck: Failed to reset quota flags.");
1347                 }
1348         } else
1349                 xfs_notice(mp, "Quotacheck: Done.");
1350         return (error);
1351 }
1352
1353 /*
1354  * This is called after the superblock has been read in and we're ready to
1355  * iget the quota inodes.
1356  */
1357 STATIC int
1358 xfs_qm_init_quotainos(
1359         xfs_mount_t     *mp)
1360 {
1361         xfs_inode_t     *uip, *gip;
1362         int             error;
1363         __int64_t       sbflags;
1364         uint            flags;
1365
1366         ASSERT(mp->m_quotainfo);
1367         uip = gip = NULL;
1368         sbflags = 0;
1369         flags = 0;
1370
1371         /*
1372          * Get the uquota and gquota inodes
1373          */
1374         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1375                 if (XFS_IS_UQUOTA_ON(mp) &&
1376                     mp->m_sb.sb_uquotino != NULLFSINO) {
1377                         ASSERT(mp->m_sb.sb_uquotino > 0);
1378                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1379                                              0, 0, &uip)))
1380                                 return XFS_ERROR(error);
1381                 }
1382                 if (XFS_IS_OQUOTA_ON(mp) &&
1383                     mp->m_sb.sb_gquotino != NULLFSINO) {
1384                         ASSERT(mp->m_sb.sb_gquotino > 0);
1385                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1386                                              0, 0, &gip))) {
1387                                 if (uip)
1388                                         IRELE(uip);
1389                                 return XFS_ERROR(error);
1390                         }
1391                 }
1392         } else {
1393                 flags |= XFS_QMOPT_SBVERSION;
1394                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1395                             XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1396         }
1397
1398         /*
1399          * Create the two inodes, if they don't exist already. The changes
1400          * made above will get added to a transaction and logged in one of
1401          * the qino_alloc calls below.  If the device is readonly,
1402          * temporarily switch to read-write to do this.
1403          */
1404         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1405                 if ((error = xfs_qm_qino_alloc(mp, &uip,
1406                                               sbflags | XFS_SB_UQUOTINO,
1407                                               flags | XFS_QMOPT_UQUOTA)))
1408                         return XFS_ERROR(error);
1409
1410                 flags &= ~XFS_QMOPT_SBVERSION;
1411         }
1412         if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1413                 flags |= (XFS_IS_GQUOTA_ON(mp) ?
1414                                 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1415                 error = xfs_qm_qino_alloc(mp, &gip,
1416                                           sbflags | XFS_SB_GQUOTINO, flags);
1417                 if (error) {
1418                         if (uip)
1419                                 IRELE(uip);
1420
1421                         return XFS_ERROR(error);
1422                 }
1423         }
1424
1425         mp->m_quotainfo->qi_uquotaip = uip;
1426         mp->m_quotainfo->qi_gquotaip = gip;
1427
1428         return 0;
1429 }
1430
1431 STATIC void
1432 xfs_qm_dqfree_one(
1433         struct xfs_dquot        *dqp)
1434 {
1435         struct xfs_mount        *mp = dqp->q_mount;
1436         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1437
1438         mutex_lock(&qi->qi_tree_lock);
1439         radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
1440                           be32_to_cpu(dqp->q_core.d_id));
1441
1442         qi->qi_dquots--;
1443         mutex_unlock(&qi->qi_tree_lock);
1444
1445         xfs_qm_dqdestroy(dqp);
1446 }
1447
1448 STATIC void
1449 xfs_qm_dqreclaim_one(
1450         struct xfs_dquot        *dqp,
1451         struct list_head        *buffer_list,
1452         struct list_head        *dispose_list)
1453 {
1454         struct xfs_mount        *mp = dqp->q_mount;
1455         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1456         int                     error;
1457
1458         if (!xfs_dqlock_nowait(dqp))
1459                 goto out_move_tail;
1460
1461         /*
1462          * This dquot has acquired a reference in the meantime remove it from
1463          * the freelist and try again.
1464          */
1465         if (dqp->q_nrefs) {
1466                 xfs_dqunlock(dqp);
1467
1468                 trace_xfs_dqreclaim_want(dqp);
1469                 XFS_STATS_INC(xs_qm_dqwants);
1470
1471                 list_del_init(&dqp->q_lru);
1472                 qi->qi_lru_count--;
1473                 XFS_STATS_DEC(xs_qm_dquot_unused);
1474                 return;
1475         }
1476
1477         /*
1478          * Try to grab the flush lock. If this dquot is in the process of
1479          * getting flushed to disk, we don't want to reclaim it.
1480          */
1481         if (!xfs_dqflock_nowait(dqp))
1482                 goto out_unlock_move_tail;
1483
1484         if (XFS_DQ_IS_DIRTY(dqp)) {
1485                 struct xfs_buf  *bp = NULL;
1486
1487                 trace_xfs_dqreclaim_dirty(dqp);
1488
1489                 error = xfs_qm_dqflush(dqp, &bp);
1490                 if (error) {
1491                         xfs_warn(mp, "%s: dquot %p flush failed",
1492                                  __func__, dqp);
1493                         goto out_unlock_move_tail;
1494                 }
1495
1496                 xfs_buf_delwri_queue(bp, buffer_list);
1497                 xfs_buf_relse(bp);
1498                 /*
1499                  * Give the dquot another try on the freelist, as the
1500                  * flushing will take some time.
1501                  */
1502                 goto out_unlock_move_tail;
1503         }
1504         xfs_dqfunlock(dqp);
1505
1506         /*
1507          * Prevent lookups now that we are past the point of no return.
1508          */
1509         dqp->dq_flags |= XFS_DQ_FREEING;
1510         xfs_dqunlock(dqp);
1511
1512         ASSERT(dqp->q_nrefs == 0);
1513         list_move_tail(&dqp->q_lru, dispose_list);
1514         qi->qi_lru_count--;
1515         XFS_STATS_DEC(xs_qm_dquot_unused);
1516
1517         trace_xfs_dqreclaim_done(dqp);
1518         XFS_STATS_INC(xs_qm_dqreclaims);
1519         return;
1520
1521         /*
1522          * Move the dquot to the tail of the list so that we don't spin on it.
1523          */
1524 out_unlock_move_tail:
1525         xfs_dqunlock(dqp);
1526 out_move_tail:
1527         list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1528         trace_xfs_dqreclaim_busy(dqp);
1529         XFS_STATS_INC(xs_qm_dqreclaim_misses);
1530 }
1531
1532 STATIC int
1533 xfs_qm_shake(
1534         struct shrinker         *shrink,
1535         struct shrink_control   *sc)
1536 {
1537         struct xfs_quotainfo    *qi =
1538                 container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1539         int                     nr_to_scan = sc->nr_to_scan;
1540         LIST_HEAD               (buffer_list);
1541         LIST_HEAD               (dispose_list);
1542         struct xfs_dquot        *dqp;
1543         int                     error;
1544
1545         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1546                 return 0;
1547         if (!nr_to_scan)
1548                 goto out;
1549
1550         mutex_lock(&qi->qi_lru_lock);
1551         while (!list_empty(&qi->qi_lru_list)) {
1552                 if (nr_to_scan-- <= 0)
1553                         break;
1554                 dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1555                                        q_lru);
1556                 xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
1557         }
1558         mutex_unlock(&qi->qi_lru_lock);
1559
1560         error = xfs_buf_delwri_submit(&buffer_list);
1561         if (error)
1562                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
1563
1564         while (!list_empty(&dispose_list)) {
1565                 dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1566                 list_del_init(&dqp->q_lru);
1567                 xfs_qm_dqfree_one(dqp);
1568         }
1569
1570 out:
1571         return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1572 }
1573
1574 /*
1575  * Start a transaction and write the incore superblock changes to
1576  * disk. flags parameter indicates which fields have changed.
1577  */
1578 int
1579 xfs_qm_write_sb_changes(
1580         xfs_mount_t     *mp,
1581         __int64_t       flags)
1582 {
1583         xfs_trans_t     *tp;
1584         int             error;
1585
1586         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1587         error = xfs_trans_reserve(tp, 0, XFS_QM_SBCHANGE_LOG_RES(mp),
1588                                   0, 0, XFS_DEFAULT_LOG_COUNT);
1589         if (error) {
1590                 xfs_trans_cancel(tp, 0);
1591                 return error;
1592         }
1593
1594         xfs_mod_sb(tp, flags);
1595         error = xfs_trans_commit(tp, 0);
1596
1597         return error;
1598 }
1599
1600
1601 /* --------------- utility functions for vnodeops ---------------- */
1602
1603
1604 /*
1605  * Given an inode, a uid, gid and prid make sure that we have
1606  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1607  * quotas by creating this file.
1608  * This also attaches dquot(s) to the given inode after locking it,
1609  * and returns the dquots corresponding to the uid and/or gid.
1610  *
1611  * in   : inode (unlocked)
1612  * out  : udquot, gdquot with references taken and unlocked
1613  */
1614 int
1615 xfs_qm_vop_dqalloc(
1616         struct xfs_inode        *ip,
1617         uid_t                   uid,
1618         gid_t                   gid,
1619         prid_t                  prid,
1620         uint                    flags,
1621         struct xfs_dquot        **O_udqpp,
1622         struct xfs_dquot        **O_gdqpp)
1623 {
1624         struct xfs_mount        *mp = ip->i_mount;
1625         struct xfs_dquot        *uq, *gq;
1626         int                     error;
1627         uint                    lockflags;
1628
1629         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1630                 return 0;
1631
1632         lockflags = XFS_ILOCK_EXCL;
1633         xfs_ilock(ip, lockflags);
1634
1635         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1636                 gid = ip->i_d.di_gid;
1637
1638         /*
1639          * Attach the dquot(s) to this inode, doing a dquot allocation
1640          * if necessary. The dquot(s) will not be locked.
1641          */
1642         if (XFS_NOT_DQATTACHED(mp, ip)) {
1643                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1644                 if (error) {
1645                         xfs_iunlock(ip, lockflags);
1646                         return error;
1647                 }
1648         }
1649
1650         uq = gq = NULL;
1651         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1652                 if (ip->i_d.di_uid != uid) {
1653                         /*
1654                          * What we need is the dquot that has this uid, and
1655                          * if we send the inode to dqget, the uid of the inode
1656                          * takes priority over what's sent in the uid argument.
1657                          * We must unlock inode here before calling dqget if
1658                          * we're not sending the inode, because otherwise
1659                          * we'll deadlock by doing trans_reserve while
1660                          * holding ilock.
1661                          */
1662                         xfs_iunlock(ip, lockflags);
1663                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1664                                                  XFS_DQ_USER,
1665                                                  XFS_QMOPT_DQALLOC |
1666                                                  XFS_QMOPT_DOWARN,
1667                                                  &uq))) {
1668                                 ASSERT(error != ENOENT);
1669                                 return error;
1670                         }
1671                         /*
1672                          * Get the ilock in the right order.
1673                          */
1674                         xfs_dqunlock(uq);
1675                         lockflags = XFS_ILOCK_SHARED;
1676                         xfs_ilock(ip, lockflags);
1677                 } else {
1678                         /*
1679                          * Take an extra reference, because we'll return
1680                          * this to caller
1681                          */
1682                         ASSERT(ip->i_udquot);
1683                         uq = xfs_qm_dqhold(ip->i_udquot);
1684                 }
1685         }
1686         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1687                 if (ip->i_d.di_gid != gid) {
1688                         xfs_iunlock(ip, lockflags);
1689                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1690                                                  XFS_DQ_GROUP,
1691                                                  XFS_QMOPT_DQALLOC |
1692                                                  XFS_QMOPT_DOWARN,
1693                                                  &gq))) {
1694                                 if (uq)
1695                                         xfs_qm_dqrele(uq);
1696                                 ASSERT(error != ENOENT);
1697                                 return error;
1698                         }
1699                         xfs_dqunlock(gq);
1700                         lockflags = XFS_ILOCK_SHARED;
1701                         xfs_ilock(ip, lockflags);
1702                 } else {
1703                         ASSERT(ip->i_gdquot);
1704                         gq = xfs_qm_dqhold(ip->i_gdquot);
1705                 }
1706         } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1707                 if (xfs_get_projid(ip) != prid) {
1708                         xfs_iunlock(ip, lockflags);
1709                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1710                                                  XFS_DQ_PROJ,
1711                                                  XFS_QMOPT_DQALLOC |
1712                                                  XFS_QMOPT_DOWARN,
1713                                                  &gq))) {
1714                                 if (uq)
1715                                         xfs_qm_dqrele(uq);
1716                                 ASSERT(error != ENOENT);
1717                                 return (error);
1718                         }
1719                         xfs_dqunlock(gq);
1720                         lockflags = XFS_ILOCK_SHARED;
1721                         xfs_ilock(ip, lockflags);
1722                 } else {
1723                         ASSERT(ip->i_gdquot);
1724                         gq = xfs_qm_dqhold(ip->i_gdquot);
1725                 }
1726         }
1727         if (uq)
1728                 trace_xfs_dquot_dqalloc(ip);
1729
1730         xfs_iunlock(ip, lockflags);
1731         if (O_udqpp)
1732                 *O_udqpp = uq;
1733         else if (uq)
1734                 xfs_qm_dqrele(uq);
1735         if (O_gdqpp)
1736                 *O_gdqpp = gq;
1737         else if (gq)
1738                 xfs_qm_dqrele(gq);
1739         return 0;
1740 }
1741
1742 /*
1743  * Actually transfer ownership, and do dquot modifications.
1744  * These were already reserved.
1745  */
1746 xfs_dquot_t *
1747 xfs_qm_vop_chown(
1748         xfs_trans_t     *tp,
1749         xfs_inode_t     *ip,
1750         xfs_dquot_t     **IO_olddq,
1751         xfs_dquot_t     *newdq)
1752 {
1753         xfs_dquot_t     *prevdq;
1754         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1755                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1756
1757
1758         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1759         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1760
1761         /* old dquot */
1762         prevdq = *IO_olddq;
1763         ASSERT(prevdq);
1764         ASSERT(prevdq != newdq);
1765
1766         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1767         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1768
1769         /* the sparkling new dquot */
1770         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1771         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1772
1773         /*
1774          * Take an extra reference, because the inode is going to keep
1775          * this dquot pointer even after the trans_commit.
1776          */
1777         *IO_olddq = xfs_qm_dqhold(newdq);
1778
1779         return prevdq;
1780 }
1781
1782 /*
1783  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1784  */
1785 int
1786 xfs_qm_vop_chown_reserve(
1787         xfs_trans_t     *tp,
1788         xfs_inode_t     *ip,
1789         xfs_dquot_t     *udqp,
1790         xfs_dquot_t     *gdqp,
1791         uint            flags)
1792 {
1793         xfs_mount_t     *mp = ip->i_mount;
1794         uint            delblks, blkflags, prjflags = 0;
1795         xfs_dquot_t     *unresudq, *unresgdq, *delblksudq, *delblksgdq;
1796         int             error;
1797
1798
1799         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1800         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1801
1802         delblks = ip->i_delayed_blks;
1803         delblksudq = delblksgdq = unresudq = unresgdq = NULL;
1804         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1805                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1806
1807         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1808             ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1809                 delblksudq = udqp;
1810                 /*
1811                  * If there are delayed allocation blocks, then we have to
1812                  * unreserve those from the old dquot, and add them to the
1813                  * new dquot.
1814                  */
1815                 if (delblks) {
1816                         ASSERT(ip->i_udquot);
1817                         unresudq = ip->i_udquot;
1818                 }
1819         }
1820         if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
1821                 if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
1822                      xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
1823                         prjflags = XFS_QMOPT_ENOSPC;
1824
1825                 if (prjflags ||
1826                     (XFS_IS_GQUOTA_ON(ip->i_mount) &&
1827                      ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
1828                         delblksgdq = gdqp;
1829                         if (delblks) {
1830                                 ASSERT(ip->i_gdquot);
1831                                 unresgdq = ip->i_gdquot;
1832                         }
1833                 }
1834         }
1835
1836         if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1837                                 delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
1838                                 flags | blkflags | prjflags)))
1839                 return (error);
1840
1841         /*
1842          * Do the delayed blks reservations/unreservations now. Since, these
1843          * are done without the help of a transaction, if a reservation fails
1844          * its previous reservations won't be automatically undone by trans
1845          * code. So, we have to do it manually here.
1846          */
1847         if (delblks) {
1848                 /*
1849                  * Do the reservations first. Unreservation can't fail.
1850                  */
1851                 ASSERT(delblksudq || delblksgdq);
1852                 ASSERT(unresudq || unresgdq);
1853                 if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1854                                 delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
1855                                 flags | blkflags | prjflags)))
1856                         return (error);
1857                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1858                                 unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
1859                                 blkflags);
1860         }
1861
1862         return (0);
1863 }
1864
1865 int
1866 xfs_qm_vop_rename_dqattach(
1867         struct xfs_inode        **i_tab)
1868 {
1869         struct xfs_mount        *mp = i_tab[0]->i_mount;
1870         int                     i;
1871
1872         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1873                 return 0;
1874
1875         for (i = 0; (i < 4 && i_tab[i]); i++) {
1876                 struct xfs_inode        *ip = i_tab[i];
1877                 int                     error;
1878
1879                 /*
1880                  * Watch out for duplicate entries in the table.
1881                  */
1882                 if (i == 0 || ip != i_tab[i-1]) {
1883                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1884                                 error = xfs_qm_dqattach(ip, 0);
1885                                 if (error)
1886                                         return error;
1887                         }
1888                 }
1889         }
1890         return 0;
1891 }
1892
1893 void
1894 xfs_qm_vop_create_dqattach(
1895         struct xfs_trans        *tp,
1896         struct xfs_inode        *ip,
1897         struct xfs_dquot        *udqp,
1898         struct xfs_dquot        *gdqp)
1899 {
1900         struct xfs_mount        *mp = tp->t_mountp;
1901
1902         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1903                 return;
1904
1905         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1906         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1907
1908         if (udqp) {
1909                 ASSERT(ip->i_udquot == NULL);
1910                 ASSERT(XFS_IS_UQUOTA_ON(mp));
1911                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1912
1913                 ip->i_udquot = xfs_qm_dqhold(udqp);
1914                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1915         }
1916         if (gdqp) {
1917                 ASSERT(ip->i_gdquot == NULL);
1918                 ASSERT(XFS_IS_OQUOTA_ON(mp));
1919                 ASSERT((XFS_IS_GQUOTA_ON(mp) ?
1920                         ip->i_d.di_gid : xfs_get_projid(ip)) ==
1921                                 be32_to_cpu(gdqp->q_core.d_id));
1922
1923                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1924                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1925         }
1926 }
1927