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