Pileus Git - ~andy/linux/blob - 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 int
 621 xfs_qm_calc_dquots_per_chunk(
 622         struct xfs_mount        *mp,
 623         unsigned int            nbblks) /* basic block units */
 624 {
 625         unsigned int    ndquots;
 626
 627         ASSERT(nbblks > 0);
 628         ndquots = BBTOB(nbblks);
 629         do_div(ndquots, sizeof(xfs_dqblk_t));
 630
 631         return ndquots;
 632 }
 633
 634 /*
 635  * This initializes all the quota information that's kept in the
 636  * mount structure
 637  */
 638 STATIC int
 639 xfs_qm_init_quotainfo(
 640         xfs_mount_t     *mp)
 641 {
 642         xfs_quotainfo_t *qinf;
 643         int             error;
 644         xfs_dquot_t     *dqp;
 645
 646         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 647
 648         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 649
 650         /*
 651          * See if quotainodes are setup, and if not, allocate them,
 652          * and change the superblock accordingly.
 653          */
 654         if ((error = xfs_qm_init_quotainos(mp))) {
 655                 kmem_free(qinf);
 656                 mp->m_quotainfo = NULL;
 657                 return error;
 658         }
 659
 660         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 661         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 662         mutex_init(&qinf->qi_tree_lock);
 663
 664         INIT_LIST_HEAD(&qinf->qi_lru_list);
 665         qinf->qi_lru_count = 0;
 666         mutex_init(&qinf->qi_lru_lock);
 667
 668         /* mutex used to serialize quotaoffs */
 669         mutex_init(&qinf->qi_quotaofflock);
 670
 671         /* Precalc some constants */
 672         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 673         qinf->qi_dqperchunk = xfs_qm_calc_dquots_per_chunk(mp,
 674                                                         qinf->qi_dqchunklen);
 675
 676         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 677
 678         /*
 679          * We try to get the limits from the superuser's limits fields.
 680          * This is quite hacky, but it is standard quota practice.
 681          *
 682          * We look at the USR dquot with id == 0 first, but if user quotas
 683          * are not enabled we goto the GRP dquot with id == 0.
 684          * We don't really care to keep separate default limits for user
 685          * and group quotas, at least not at this point.
 686          *
 687          * Since we may not have done a quotacheck by this point, just read
 688          * the dquot without attaching it to any hashtables or lists.
 689          */
 690         error = xfs_qm_dqread(mp, 0,
 691                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 692                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 693                           XFS_DQ_PROJ),
 694                         XFS_QMOPT_DOWARN, &dqp);
 695         if (!error) {
 696                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 697
 698                 /*
 699                  * The warnings and timers set the grace period given to
 700                  * a user or group before he or she can not perform any
 701                  * more writing. If it is zero, a default is used.
 702                  */
 703                 qinf->qi_btimelimit = ddqp->d_btimer ?
 704                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 705                 qinf->qi_itimelimit = ddqp->d_itimer ?
 706                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 707                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 708                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 709                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 710                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 711                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 712                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 713                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 714                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 715                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 716                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 717                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 718                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 719                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 720                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 721
 722                 xfs_qm_dqdestroy(dqp);
 723         } else {
 724                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 725                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 726                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 727                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 728                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 729                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 730         }
 731
 732         qinf->qi_shrinker.shrink = xfs_qm_shake;
 733         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 734         register_shrinker(&qinf->qi_shrinker);
 735         return 0;
 736 }
 737
 738
 739 /*
 740  * Gets called when unmounting a filesystem or when all quotas get
 741  * turned off.
 742  * This purges the quota inodes, destroys locks and frees itself.
 743  */
 744 void
 745 xfs_qm_destroy_quotainfo(
 746         xfs_mount_t     *mp)
 747 {
 748         xfs_quotainfo_t *qi;
 749
 750         qi = mp->m_quotainfo;
 751         ASSERT(qi != NULL);
 752
 753         unregister_shrinker(&qi->qi_shrinker);
 754
 755         if (qi->qi_uquotaip) {
 756                 IRELE(qi->qi_uquotaip);
 757                 qi->qi_uquotaip = NULL; /* paranoia */
 758         }
 759         if (qi->qi_gquotaip) {
 760                 IRELE(qi->qi_gquotaip);
 761                 qi->qi_gquotaip = NULL;
 762         }
 763         mutex_destroy(&qi->qi_quotaofflock);
 764         kmem_free(qi);
 765         mp->m_quotainfo = NULL;
 766 }
 767
 768 /*
 769  * Create an inode and return with a reference already taken, but unlocked
 770  * This is how we create quota inodes
 771  */
 772 STATIC int
 773 xfs_qm_qino_alloc(
 774         xfs_mount_t     *mp,
 775         xfs_inode_t     **ip,
 776         __int64_t       sbfields,
 777         uint            flags)
 778 {
 779         xfs_trans_t     *tp;
 780         int             error;
 781         int             committed;
 782
 783         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 784         if ((error = xfs_trans_reserve(tp,
 785                                       XFS_QM_QINOCREATE_SPACE_RES(mp),
 786                                       XFS_CREATE_LOG_RES(mp), 0,
 787                                       XFS_TRANS_PERM_LOG_RES,
 788                                       XFS_CREATE_LOG_COUNT))) {
 789                 xfs_trans_cancel(tp, 0);
 790                 return error;
 791         }
 792
 793         error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 794         if (error) {
 795                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 796                                  XFS_TRANS_ABORT);
 797                 return error;
 798         }
 799
 800         /*
 801          * Make the changes in the superblock, and log those too.
 802          * sbfields arg may contain fields other than *QUOTINO;
 803          * VERSIONNUM for example.
 804          */
 805         spin_lock(&mp->m_sb_lock);
 806         if (flags & XFS_QMOPT_SBVERSION) {
 807                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 808                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 809                                    XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 810                        (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 811                         XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 812
 813                 xfs_sb_version_addquota(&mp->m_sb);
 814                 mp->m_sb.sb_uquotino = NULLFSINO;
 815                 mp->m_sb.sb_gquotino = NULLFSINO;
 816
 817                 /* qflags will get updated _after_ quotacheck */
 818                 mp->m_sb.sb_qflags = 0;
 819         }
 820         if (flags & XFS_QMOPT_UQUOTA)
 821                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 822         else
 823                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 824         spin_unlock(&mp->m_sb_lock);
 825         xfs_mod_sb(tp, sbfields);
 826
 827         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 828                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 829                 return error;
 830         }
 831         return 0;
 832 }
 833
 834
 835 STATIC void
 836 xfs_qm_reset_dqcounts(
 837         xfs_mount_t     *mp,
 838         xfs_buf_t       *bp,
 839         xfs_dqid_t      id,
 840         uint            type)
 841 {
 842         xfs_disk_dquot_t        *ddq;
 843         int                     j;
 844
 845         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 846
 847         /*
 848          * Reset all counters and timers. They'll be
 849          * started afresh by xfs_qm_quotacheck.
 850          */
 851 #ifdef DEBUG
 852         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 853         do_div(j, sizeof(xfs_dqblk_t));
 854         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 855 #endif
 856         ddq = bp->b_addr;
 857         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 858                 /*
 859                  * Do a sanity check, and if needed, repair the dqblk. Don't
 860                  * output any warnings because it's perfectly possible to
 861                  * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 862                  */
 863                 (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 864                                       "xfs_quotacheck");
 865                 ddq->d_bcount = 0;
 866                 ddq->d_icount = 0;
 867                 ddq->d_rtbcount = 0;
 868                 ddq->d_btimer = 0;
 869                 ddq->d_itimer = 0;
 870                 ddq->d_rtbtimer = 0;
 871                 ddq->d_bwarns = 0;
 872                 ddq->d_iwarns = 0;
 873                 ddq->d_rtbwarns = 0;
 874                 ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
 875         }
 876 }
 877
 878 STATIC int
 879 xfs_qm_dqiter_bufs(
 880         struct xfs_mount        *mp,
 881         xfs_dqid_t              firstid,
 882         xfs_fsblock_t           bno,
 883         xfs_filblks_t           blkcnt,
 884         uint                    flags,
 885         struct list_head        *buffer_list)
 886 {
 887         struct xfs_buf          *bp;
 888         int                     error;
 889         int                     type;
 890
 891         ASSERT(blkcnt > 0);
 892         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 893                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 894         error = 0;
 895
 896         /*
 897          * Blkcnt arg can be a very big number, and might even be
 898          * larger than the log itself. So, we have to break it up into
 899          * manageable-sized transactions.
 900          * Note that we don't start a permanent transaction here; we might
 901          * not be able to get a log reservation for the whole thing up front,
 902          * and we don't really care to either, because we just discard
 903          * everything if we were to crash in the middle of this loop.
 904          */
 905         while (blkcnt--) {
 906                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 907                               XFS_FSB_TO_DADDR(mp, bno),
 908                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 909                               &xfs_dquot_buf_ops);
 910                 if (error)
 911                         break;
 912
 913                 /*
 914                  * XXX(hch): need to figure out if it makes sense to validate
 915                  *           the CRC here.
 916                  */
 917                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 918                 xfs_buf_delwri_queue(bp, buffer_list);
 919                 xfs_buf_relse(bp);
 920                 /*
 921                  * goto the next block.
 922                  */
 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                 nmaps = XFS_DQITER_MAP_SIZE;
 965                 /*
 966                  * We aren't changing the inode itself. Just changing
 967                  * some of its data. No new blocks are added here, and
 968                  * the inode is never added to the transaction.
 969                  */
 970                 xfs_ilock(qip, XFS_ILOCK_SHARED);
 971                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 972                                        map, &nmaps, 0);
 973                 xfs_iunlock(qip, XFS_ILOCK_SHARED);
 974                 if (error)
 975                         break;
 976
 977                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 978                 for (i = 0; i < nmaps; i++) {
 979                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 980                         ASSERT(map[i].br_blockcount);
 981
 982
 983                         lblkno += map[i].br_blockcount;
 984
 985                         if (map[i].br_startblock == HOLESTARTBLOCK)
 986                                 continue;
 987
 988                         firstid = (xfs_dqid_t) map[i].br_startoff *
 989                                 mp->m_quotainfo->qi_dqperchunk;
 990                         /*
 991                          * Do a read-ahead on the next extent.
 992                          */
 993                         if ((i+1 < nmaps) &&
 994                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 995                                 rablkcnt =  map[i+1].br_blockcount;
 996                                 rablkno = map[i+1].br_startblock;
 997                                 while (rablkcnt--) {
 998                                         xfs_buf_readahead(mp->m_ddev_targp,
 999                                                XFS_FSB_TO_DADDR(mp, rablkno),
1000                                                mp->m_quotainfo->qi_dqchunklen,
1001                                                NULL);
1002                                         rablkno++;
1003                                 }
1004                         }
1005                         /*
1006                          * Iterate thru all the blks in the extent and
1007                          * reset the counters of all the dquots inside them.
1008                          */
1009                         error = xfs_qm_dqiter_bufs(mp, firstid,
1010                                                    map[i].br_startblock,
1011                                                    map[i].br_blockcount,
1012                                                    flags, buffer_list);
1013                         if (error)
1014                                 goto out;
1015                 }
1016         } while (nmaps > 0);
1017
1018 out:
1019         kmem_free(map);
1020         return error;
1021 }
1022
1023 /*
1024  * Called by dqusage_adjust in doing a quotacheck.
1025  *
1026  * Given the inode, and a dquot id this updates both the incore dqout as well
1027  * as the buffer copy. This is so that once the quotacheck is done, we can
1028  * just log all the buffers, as opposed to logging numerous updates to
1029  * individual dquots.
1030  */
1031 STATIC int
1032 xfs_qm_quotacheck_dqadjust(
1033         struct xfs_inode        *ip,
1034         xfs_dqid_t              id,
1035         uint                    type,
1036         xfs_qcnt_t              nblks,
1037         xfs_qcnt_t              rtblks)
1038 {
1039         struct xfs_mount        *mp = ip->i_mount;
1040         struct xfs_dquot        *dqp;
1041         int                     error;
1042
1043         error = xfs_qm_dqget(mp, ip, id, type,
1044                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1045         if (error) {
1046                 /*
1047                  * Shouldn't be able to turn off quotas here.
1048                  */
1049                 ASSERT(error != ESRCH);
1050                 ASSERT(error != ENOENT);
1051                 return error;
1052         }
1053
1054         trace_xfs_dqadjust(dqp);
1055
1056         /*
1057          * Adjust the inode count and the block count to reflect this inode's
1058          * resource usage.
1059          */
1060         be64_add_cpu(&dqp->q_core.d_icount, 1);
1061         dqp->q_res_icount++;
1062         if (nblks) {
1063                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1064                 dqp->q_res_bcount += nblks;
1065         }
1066         if (rtblks) {
1067                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1068                 dqp->q_res_rtbcount += rtblks;
1069         }
1070
1071         /*
1072          * Set default limits, adjust timers (since we changed usages)
1073          *
1074          * There are no timers for the default values set in the root dquot.
1075          */
1076         if (dqp->q_core.d_id) {
1077                 xfs_qm_adjust_dqlimits(mp, dqp);
1078                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1079         }
1080
1081         dqp->dq_flags |= XFS_DQ_DIRTY;
1082         xfs_qm_dqput(dqp);
1083         return 0;
1084 }
1085
1086 STATIC int
1087 xfs_qm_get_rtblks(
1088         xfs_inode_t     *ip,
1089         xfs_qcnt_t      *O_rtblks)
1090 {
1091         xfs_filblks_t   rtblks;                 /* total rt blks */
1092         xfs_extnum_t    idx;                    /* extent record index */
1093         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1094         xfs_extnum_t    nextents;               /* number of extent entries */
1095         int             error;
1096
1097         ASSERT(XFS_IS_REALTIME_INODE(ip));
1098         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1099         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1100                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1101                         return error;
1102         }
1103         rtblks = 0;
1104         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1105         for (idx = 0; idx < nextents; idx++)
1106                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1107         *O_rtblks = (xfs_qcnt_t)rtblks;
1108         return 0;
1109 }
1110
1111 /*
1112  * callback routine supplied to bulkstat(). Given an inumber, find its
1113  * dquots and update them to account for resources taken by that inode.
1114  */
1115 /* ARGSUSED */
1116 STATIC int
1117 xfs_qm_dqusage_adjust(
1118         xfs_mount_t     *mp,            /* mount point for filesystem */
1119         xfs_ino_t       ino,            /* inode number to get data for */
1120         void            __user *buffer, /* not used */
1121         int             ubsize,         /* not used */
1122         int             *ubused,        /* not used */
1123         int             *res)           /* result code value */
1124 {
1125         xfs_inode_t     *ip;
1126         xfs_qcnt_t      nblks, rtblks = 0;
1127         int             error;
1128
1129         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1130
1131         /*
1132          * rootino must have its resources accounted for, not so with the quota
1133          * inodes.
1134          */
1135         if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1136                 *res = BULKSTAT_RV_NOTHING;
1137                 return XFS_ERROR(EINVAL);
1138         }
1139
1140         /*
1141          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1142          * interface expects the inode to be exclusively locked because that's
1143          * the case in all other instances. It's OK that we do this because
1144          * quotacheck is done only at mount time.
1145          */
1146         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1147         if (error) {
1148                 *res = BULKSTAT_RV_NOTHING;
1149                 return error;
1150         }
1151
1152         ASSERT(ip->i_delayed_blks == 0);
1153
1154         if (XFS_IS_REALTIME_INODE(ip)) {
1155                 /*
1156                  * Walk thru the extent list and count the realtime blocks.
1157                  */
1158                 error = xfs_qm_get_rtblks(ip, &rtblks);
1159                 if (error)
1160                         goto error0;
1161         }
1162
1163         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1164
1165         /*
1166          * Add the (disk blocks and inode) resources occupied by this
1167          * inode to its dquots. We do this adjustment in the incore dquot,
1168          * and also copy the changes to its buffer.
1169          * We don't care about putting these changes in a transaction
1170          * envelope because if we crash in the middle of a 'quotacheck'
1171          * we have to start from the beginning anyway.
1172          * Once we're done, we'll log all the dquot bufs.
1173          *
1174          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1175          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1176          */
1177         if (XFS_IS_UQUOTA_ON(mp)) {
1178                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1179                                                    XFS_DQ_USER, nblks, rtblks);
1180                 if (error)
1181                         goto error0;
1182         }
1183
1184         if (XFS_IS_GQUOTA_ON(mp)) {
1185                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1186                                                    XFS_DQ_GROUP, nblks, rtblks);
1187                 if (error)
1188                         goto error0;
1189         }
1190
1191         if (XFS_IS_PQUOTA_ON(mp)) {
1192                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1193                                                    XFS_DQ_PROJ, nblks, rtblks);
1194                 if (error)
1195                         goto error0;
1196         }
1197
1198         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1199         IRELE(ip);
1200         *res = BULKSTAT_RV_DIDONE;
1201         return 0;
1202
1203 error0:
1204         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1205         IRELE(ip);
1206         *res = BULKSTAT_RV_GIVEUP;
1207         return error;
1208 }
1209
1210 STATIC int
1211 xfs_qm_flush_one(
1212         struct xfs_dquot        *dqp,
1213         void                    *data)
1214 {
1215         struct list_head        *buffer_list = data;
1216         struct xfs_buf          *bp = NULL;
1217         int                     error = 0;
1218
1219         xfs_dqlock(dqp);
1220         if (dqp->dq_flags & XFS_DQ_FREEING)
1221                 goto out_unlock;
1222         if (!XFS_DQ_IS_DIRTY(dqp))
1223                 goto out_unlock;
1224
1225         xfs_dqflock(dqp);
1226         error = xfs_qm_dqflush(dqp, &bp);
1227         if (error)
1228                 goto out_unlock;
1229
1230         xfs_buf_delwri_queue(bp, buffer_list);
1231         xfs_buf_relse(bp);
1232 out_unlock:
1233         xfs_dqunlock(dqp);
1234         return error;
1235 }
1236
1237 /*
1238  * Walk thru all the filesystem inodes and construct a consistent view
1239  * of the disk quota world. If the quotacheck fails, disable quotas.
1240  */
1241 int
1242 xfs_qm_quotacheck(
1243         xfs_mount_t     *mp)
1244 {
1245         int             done, count, error, error2;
1246         xfs_ino_t       lastino;
1247         size_t          structsz;
1248         xfs_inode_t     *uip, *gip;
1249         uint            flags;
1250         LIST_HEAD       (buffer_list);
1251
1252         count = INT_MAX;
1253         structsz = 1;
1254         lastino = 0;
1255         flags = 0;
1256
1257         ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1258         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1259
1260         xfs_notice(mp, "Quotacheck needed: Please wait.");
1261
1262         /*
1263          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1264          * their counters to zero. We need a clean slate.
1265          * We don't log our changes till later.
1266          */
1267         uip = mp->m_quotainfo->qi_uquotaip;
1268         if (uip) {
1269                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1270                                          &buffer_list);
1271                 if (error)
1272                         goto error_return;
1273                 flags |= XFS_UQUOTA_CHKD;
1274         }
1275
1276         gip = mp->m_quotainfo->qi_gquotaip;
1277         if (gip) {
1278                 error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1279                                          XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA,
1280                                          &buffer_list);
1281                 if (error)
1282                         goto error_return;
1283                 flags |= XFS_OQUOTA_CHKD;
1284         }
1285
1286         do {
1287                 /*
1288                  * Iterate thru all the inodes in the file system,
1289                  * adjusting the corresponding dquot counters in core.
1290                  */
1291                 error = xfs_bulkstat(mp, &lastino, &count,
1292                                      xfs_qm_dqusage_adjust,
1293                                      structsz, NULL, &done);
1294                 if (error)
1295                         break;
1296
1297         } while (!done);
1298
1299         /*
1300          * We've made all the changes that we need to make incore.  Flush them
1301          * down to disk buffers if everything was updated successfully.
1302          */
1303         if (XFS_IS_UQUOTA_ON(mp)) {
1304                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1305                                           &buffer_list);
1306         }
1307         if (XFS_IS_GQUOTA_ON(mp)) {
1308                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1309                                            &buffer_list);
1310                 if (!error)
1311                         error = error2;
1312         }
1313         if (XFS_IS_PQUOTA_ON(mp)) {
1314                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1315                                            &buffer_list);
1316                 if (!error)
1317                         error = error2;
1318         }
1319
1320         error2 = xfs_buf_delwri_submit(&buffer_list);
1321         if (!error)
1322                 error = error2;
1323
1324         /*
1325          * We can get this error if we couldn't do a dquot allocation inside
1326          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1327          * dirty dquots that might be cached, we just want to get rid of them
1328          * and turn quotaoff. The dquots won't be attached to any of the inodes
1329          * at this point (because we intentionally didn't in dqget_noattach).
1330          */
1331         if (error) {
1332                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1333                 goto error_return;
1334         }
1335
1336         /*
1337          * If one type of quotas is off, then it will lose its
1338          * quotachecked status, since we won't be doing accounting for
1339          * that type anymore.
1340          */
1341         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1342         mp->m_qflags |= flags;
1343
1344  error_return:
1345         while (!list_empty(&buffer_list)) {
1346                 struct xfs_buf *bp =
1347                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1348                 list_del_init(&bp->b_list);
1349                 xfs_buf_relse(bp);
1350         }
1351
1352         if (error) {
1353                 xfs_warn(mp,
1354         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1355                         error);
1356                 /*
1357                  * We must turn off quotas.
1358                  */
1359                 ASSERT(mp->m_quotainfo != NULL);
1360                 xfs_qm_destroy_quotainfo(mp);
1361                 if (xfs_mount_reset_sbqflags(mp)) {
1362                         xfs_warn(mp,
1363                                 "Quotacheck: Failed to reset quota flags.");
1364                 }
1365         } else
1366                 xfs_notice(mp, "Quotacheck: Done.");
1367         return (error);
1368 }
1369
1370 /*
1371  * This is called after the superblock has been read in and we're ready to
1372  * iget the quota inodes.
1373  */
1374 STATIC int
1375 xfs_qm_init_quotainos(
1376         xfs_mount_t     *mp)
1377 {
1378         xfs_inode_t     *uip, *gip;
1379         int             error;
1380         __int64_t       sbflags;
1381         uint            flags;
1382
1383         ASSERT(mp->m_quotainfo);
1384         uip = gip = NULL;
1385         sbflags = 0;
1386         flags = 0;
1387
1388         /*
1389          * Get the uquota and gquota inodes
1390          */
1391         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1392                 if (XFS_IS_UQUOTA_ON(mp) &&
1393                     mp->m_sb.sb_uquotino != NULLFSINO) {
1394                         ASSERT(mp->m_sb.sb_uquotino > 0);
1395                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1396                                              0, 0, &uip)))
1397                                 return XFS_ERROR(error);
1398                 }
1399                 if (XFS_IS_OQUOTA_ON(mp) &&
1400                     mp->m_sb.sb_gquotino != NULLFSINO) {
1401                         ASSERT(mp->m_sb.sb_gquotino > 0);
1402                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1403                                              0, 0, &gip))) {
1404                                 if (uip)
1405                                         IRELE(uip);
1406                                 return XFS_ERROR(error);
1407                         }
1408                 }
1409         } else {
1410                 flags |= XFS_QMOPT_SBVERSION;
1411                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1412                             XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1413         }
1414
1415         /*
1416          * Create the two inodes, if they don't exist already. The changes
1417          * made above will get added to a transaction and logged in one of
1418          * the qino_alloc calls below.  If the device is readonly,
1419          * temporarily switch to read-write to do this.
1420          */
1421         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1422                 if ((error = xfs_qm_qino_alloc(mp, &uip,
1423                                               sbflags | XFS_SB_UQUOTINO,
1424                                               flags | XFS_QMOPT_UQUOTA)))
1425                         return XFS_ERROR(error);
1426
1427                 flags &= ~XFS_QMOPT_SBVERSION;
1428         }
1429         if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1430                 flags |= (XFS_IS_GQUOTA_ON(mp) ?
1431                                 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1432                 error = xfs_qm_qino_alloc(mp, &gip,
1433                                           sbflags | XFS_SB_GQUOTINO, flags);
1434                 if (error) {
1435                         if (uip)
1436                                 IRELE(uip);
1437
1438                         return XFS_ERROR(error);
1439                 }
1440         }
1441
1442         mp->m_quotainfo->qi_uquotaip = uip;
1443         mp->m_quotainfo->qi_gquotaip = gip;
1444
1445         return 0;
1446 }
1447
1448 STATIC void
1449 xfs_qm_dqfree_one(
1450         struct xfs_dquot        *dqp)
1451 {
1452         struct xfs_mount        *mp = dqp->q_mount;
1453         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1454
1455         mutex_lock(&qi->qi_tree_lock);
1456         radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
1457                           be32_to_cpu(dqp->q_core.d_id));
1458
1459         qi->qi_dquots--;
1460         mutex_unlock(&qi->qi_tree_lock);
1461
1462         xfs_qm_dqdestroy(dqp);
1463 }
1464
1465 STATIC void
1466 xfs_qm_dqreclaim_one(
1467         struct xfs_dquot        *dqp,
1468         struct list_head        *buffer_list,
1469         struct list_head        *dispose_list)
1470 {
1471         struct xfs_mount        *mp = dqp->q_mount;
1472         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1473         int                     error;
1474
1475         if (!xfs_dqlock_nowait(dqp))
1476                 goto out_move_tail;
1477
1478         /*
1479          * This dquot has acquired a reference in the meantime remove it from
1480          * the freelist and try again.
1481          */
1482         if (dqp->q_nrefs) {
1483                 xfs_dqunlock(dqp);
1484
1485                 trace_xfs_dqreclaim_want(dqp);
1486                 XFS_STATS_INC(xs_qm_dqwants);
1487
1488                 list_del_init(&dqp->q_lru);
1489                 qi->qi_lru_count--;
1490                 XFS_STATS_DEC(xs_qm_dquot_unused);
1491                 return;
1492         }
1493
1494         /*
1495          * Try to grab the flush lock. If this dquot is in the process of
1496          * getting flushed to disk, we don't want to reclaim it.
1497          */
1498         if (!xfs_dqflock_nowait(dqp))
1499                 goto out_unlock_move_tail;
1500
1501         if (XFS_DQ_IS_DIRTY(dqp)) {
1502                 struct xfs_buf  *bp = NULL;
1503
1504                 trace_xfs_dqreclaim_dirty(dqp);
1505
1506                 error = xfs_qm_dqflush(dqp, &bp);
1507                 if (error) {
1508                         xfs_warn(mp, "%s: dquot %p flush failed",
1509                                  __func__, dqp);
1510                         goto out_unlock_move_tail;
1511                 }
1512
1513                 xfs_buf_delwri_queue(bp, buffer_list);
1514                 xfs_buf_relse(bp);
1515                 /*
1516                  * Give the dquot another try on the freelist, as the
1517                  * flushing will take some time.
1518                  */
1519                 goto out_unlock_move_tail;
1520         }
1521         xfs_dqfunlock(dqp);
1522
1523         /*
1524          * Prevent lookups now that we are past the point of no return.
1525          */
1526         dqp->dq_flags |= XFS_DQ_FREEING;
1527         xfs_dqunlock(dqp);
1528
1529         ASSERT(dqp->q_nrefs == 0);
1530         list_move_tail(&dqp->q_lru, dispose_list);
1531         qi->qi_lru_count--;
1532         XFS_STATS_DEC(xs_qm_dquot_unused);
1533
1534         trace_xfs_dqreclaim_done(dqp);
1535         XFS_STATS_INC(xs_qm_dqreclaims);
1536         return;
1537
1538         /*
1539          * Move the dquot to the tail of the list so that we don't spin on it.
1540          */
1541 out_unlock_move_tail:
1542         xfs_dqunlock(dqp);
1543 out_move_tail:
1544         list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1545         trace_xfs_dqreclaim_busy(dqp);
1546         XFS_STATS_INC(xs_qm_dqreclaim_misses);
1547 }
1548
1549 STATIC int
1550 xfs_qm_shake(
1551         struct shrinker         *shrink,
1552         struct shrink_control   *sc)
1553 {
1554         struct xfs_quotainfo    *qi =
1555                 container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1556         int                     nr_to_scan = sc->nr_to_scan;
1557         LIST_HEAD               (buffer_list);
1558         LIST_HEAD               (dispose_list);
1559         struct xfs_dquot        *dqp;
1560         int                     error;
1561
1562         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1563                 return 0;
1564         if (!nr_to_scan)
1565                 goto out;
1566
1567         mutex_lock(&qi->qi_lru_lock);
1568         while (!list_empty(&qi->qi_lru_list)) {
1569                 if (nr_to_scan-- <= 0)
1570                         break;
1571                 dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1572                                        q_lru);
1573                 xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
1574         }
1575         mutex_unlock(&qi->qi_lru_lock);
1576
1577         error = xfs_buf_delwri_submit(&buffer_list);
1578         if (error)
1579                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
1580
1581         while (!list_empty(&dispose_list)) {
1582                 dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1583                 list_del_init(&dqp->q_lru);
1584                 xfs_qm_dqfree_one(dqp);
1585         }
1586
1587 out:
1588         return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1589 }
1590
1591 /*
1592  * Start a transaction and write the incore superblock changes to
1593  * disk. flags parameter indicates which fields have changed.
1594  */
1595 int
1596 xfs_qm_write_sb_changes(
1597         xfs_mount_t     *mp,
1598         __int64_t       flags)
1599 {
1600         xfs_trans_t     *tp;
1601         int             error;
1602
1603         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1604         error = xfs_trans_reserve(tp, 0, XFS_QM_SBCHANGE_LOG_RES(mp),
1605                                   0, 0, XFS_DEFAULT_LOG_COUNT);
1606         if (error) {
1607                 xfs_trans_cancel(tp, 0);
1608                 return error;
1609         }
1610
1611         xfs_mod_sb(tp, flags);
1612         error = xfs_trans_commit(tp, 0);
1613
1614         return error;
1615 }
1616
1617
1618 /* --------------- utility functions for vnodeops ---------------- */
1619
1620
1621 /*
1622  * Given an inode, a uid, gid and prid make sure that we have
1623  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1624  * quotas by creating this file.
1625  * This also attaches dquot(s) to the given inode after locking it,
1626  * and returns the dquots corresponding to the uid and/or gid.
1627  *
1628  * in   : inode (unlocked)
1629  * out  : udquot, gdquot with references taken and unlocked
1630  */
1631 int
1632 xfs_qm_vop_dqalloc(
1633         struct xfs_inode        *ip,
1634         uid_t                   uid,
1635         gid_t                   gid,
1636         prid_t                  prid,
1637         uint                    flags,
1638         struct xfs_dquot        **O_udqpp,
1639         struct xfs_dquot        **O_gdqpp)
1640 {
1641         struct xfs_mount        *mp = ip->i_mount;
1642         struct xfs_dquot        *uq, *gq;
1643         int                     error;
1644         uint                    lockflags;
1645
1646         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1647                 return 0;
1648
1649         lockflags = XFS_ILOCK_EXCL;
1650         xfs_ilock(ip, lockflags);
1651
1652         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1653                 gid = ip->i_d.di_gid;
1654
1655         /*
1656          * Attach the dquot(s) to this inode, doing a dquot allocation
1657          * if necessary. The dquot(s) will not be locked.
1658          */
1659         if (XFS_NOT_DQATTACHED(mp, ip)) {
1660                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1661                 if (error) {
1662                         xfs_iunlock(ip, lockflags);
1663                         return error;
1664                 }
1665         }
1666
1667         uq = gq = NULL;
1668         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1669                 if (ip->i_d.di_uid != uid) {
1670                         /*
1671                          * What we need is the dquot that has this uid, and
1672                          * if we send the inode to dqget, the uid of the inode
1673                          * takes priority over what's sent in the uid argument.
1674                          * We must unlock inode here before calling dqget if
1675                          * we're not sending the inode, because otherwise
1676                          * we'll deadlock by doing trans_reserve while
1677                          * holding ilock.
1678                          */
1679                         xfs_iunlock(ip, lockflags);
1680                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1681                                                  XFS_DQ_USER,
1682                                                  XFS_QMOPT_DQALLOC |
1683                                                  XFS_QMOPT_DOWARN,
1684                                                  &uq))) {
1685                                 ASSERT(error != ENOENT);
1686                                 return error;
1687                         }
1688                         /*
1689                          * Get the ilock in the right order.
1690                          */
1691                         xfs_dqunlock(uq);
1692                         lockflags = XFS_ILOCK_SHARED;
1693                         xfs_ilock(ip, lockflags);
1694                 } else {
1695                         /*
1696                          * Take an extra reference, because we'll return
1697                          * this to caller
1698                          */
1699                         ASSERT(ip->i_udquot);
1700                         uq = xfs_qm_dqhold(ip->i_udquot);
1701                 }
1702         }
1703         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1704                 if (ip->i_d.di_gid != gid) {
1705                         xfs_iunlock(ip, lockflags);
1706                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1707                                                  XFS_DQ_GROUP,
1708                                                  XFS_QMOPT_DQALLOC |
1709                                                  XFS_QMOPT_DOWARN,
1710                                                  &gq))) {
1711                                 if (uq)
1712                                         xfs_qm_dqrele(uq);
1713                                 ASSERT(error != ENOENT);
1714                                 return error;
1715                         }
1716                         xfs_dqunlock(gq);
1717                         lockflags = XFS_ILOCK_SHARED;
1718                         xfs_ilock(ip, lockflags);
1719                 } else {
1720                         ASSERT(ip->i_gdquot);
1721                         gq = xfs_qm_dqhold(ip->i_gdquot);
1722                 }
1723         } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1724                 if (xfs_get_projid(ip) != prid) {
1725                         xfs_iunlock(ip, lockflags);
1726                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1727                                                  XFS_DQ_PROJ,
1728                                                  XFS_QMOPT_DQALLOC |
1729                                                  XFS_QMOPT_DOWARN,
1730                                                  &gq))) {
1731                                 if (uq)
1732                                         xfs_qm_dqrele(uq);
1733                                 ASSERT(error != ENOENT);
1734                                 return (error);
1735                         }
1736                         xfs_dqunlock(gq);
1737                         lockflags = XFS_ILOCK_SHARED;
1738                         xfs_ilock(ip, lockflags);
1739                 } else {
1740                         ASSERT(ip->i_gdquot);
1741                         gq = xfs_qm_dqhold(ip->i_gdquot);
1742                 }
1743         }
1744         if (uq)
1745                 trace_xfs_dquot_dqalloc(ip);
1746
1747         xfs_iunlock(ip, lockflags);
1748         if (O_udqpp)
1749                 *O_udqpp = uq;
1750         else if (uq)
1751                 xfs_qm_dqrele(uq);
1752         if (O_gdqpp)
1753                 *O_gdqpp = gq;
1754         else if (gq)
1755                 xfs_qm_dqrele(gq);
1756         return 0;
1757 }
1758
1759 /*
1760  * Actually transfer ownership, and do dquot modifications.
1761  * These were already reserved.
1762  */
1763 xfs_dquot_t *
1764 xfs_qm_vop_chown(
1765         xfs_trans_t     *tp,
1766         xfs_inode_t     *ip,
1767         xfs_dquot_t     **IO_olddq,
1768         xfs_dquot_t     *newdq)
1769 {
1770         xfs_dquot_t     *prevdq;
1771         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1772                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1773
1774
1775         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1776         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1777
1778         /* old dquot */
1779         prevdq = *IO_olddq;
1780         ASSERT(prevdq);
1781         ASSERT(prevdq != newdq);
1782
1783         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1784         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1785
1786         /* the sparkling new dquot */
1787         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1788         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1789
1790         /*
1791          * Take an extra reference, because the inode is going to keep
1792          * this dquot pointer even after the trans_commit.
1793          */
1794         *IO_olddq = xfs_qm_dqhold(newdq);
1795
1796         return prevdq;
1797 }
1798
1799 /*
1800  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1801  */
1802 int
1803 xfs_qm_vop_chown_reserve(
1804         xfs_trans_t     *tp,
1805         xfs_inode_t     *ip,
1806         xfs_dquot_t     *udqp,
1807         xfs_dquot_t     *gdqp,
1808         uint            flags)
1809 {
1810         xfs_mount_t     *mp = ip->i_mount;
1811         uint            delblks, blkflags, prjflags = 0;
1812         xfs_dquot_t     *unresudq, *unresgdq, *delblksudq, *delblksgdq;
1813         int             error;
1814
1815
1816         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1817         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1818
1819         delblks = ip->i_delayed_blks;
1820         delblksudq = delblksgdq = unresudq = unresgdq = NULL;
1821         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1822                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1823
1824         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1825             ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1826                 delblksudq = udqp;
1827                 /*
1828                  * If there are delayed allocation blocks, then we have to
1829                  * unreserve those from the old dquot, and add them to the
1830                  * new dquot.
1831                  */
1832                 if (delblks) {
1833                         ASSERT(ip->i_udquot);
1834                         unresudq = ip->i_udquot;
1835                 }
1836         }
1837         if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
1838                 if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
1839                      xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
1840                         prjflags = XFS_QMOPT_ENOSPC;
1841
1842                 if (prjflags ||
1843                     (XFS_IS_GQUOTA_ON(ip->i_mount) &&
1844                      ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
1845                         delblksgdq = gdqp;
1846                         if (delblks) {
1847                                 ASSERT(ip->i_gdquot);
1848                                 unresgdq = ip->i_gdquot;
1849                         }
1850                 }
1851         }
1852
1853         if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1854                                 delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
1855                                 flags | blkflags | prjflags)))
1856                 return (error);
1857
1858         /*
1859          * Do the delayed blks reservations/unreservations now. Since, these
1860          * are done without the help of a transaction, if a reservation fails
1861          * its previous reservations won't be automatically undone by trans
1862          * code. So, we have to do it manually here.
1863          */
1864         if (delblks) {
1865                 /*
1866                  * Do the reservations first. Unreservation can't fail.
1867                  */
1868                 ASSERT(delblksudq || delblksgdq);
1869                 ASSERT(unresudq || unresgdq);
1870                 if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1871                                 delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
1872                                 flags | blkflags | prjflags)))
1873                         return (error);
1874                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1875                                 unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
1876                                 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 {
1917         struct xfs_mount        *mp = tp->t_mountp;
1918
1919         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1920                 return;
1921
1922         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1923         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1924
1925         if (udqp) {
1926                 ASSERT(ip->i_udquot == NULL);
1927                 ASSERT(XFS_IS_UQUOTA_ON(mp));
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) {
1934                 ASSERT(ip->i_gdquot == NULL);
1935                 ASSERT(XFS_IS_OQUOTA_ON(mp));
1936                 ASSERT((XFS_IS_GQUOTA_ON(mp) ?
1937                         ip->i_d.di_gid : xfs_get_projid(ip)) ==
1938                                 be32_to_cpu(gdqp->q_core.d_id));
1939
1940                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1941                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1942         }
1943 }
1944