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 #include "xfs_cksum.h"
  45
  46 /*
  47  * The global quota manager. There is only one of these for the entire
  48  * system, _not_ one per file system. XQM keeps track of the overall
  49  * quota functionality, including maintaining the freelist and hash
  50  * tables of dquots.
  51  */
  52 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  53 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  54 STATIC int      xfs_qm_shake(struct shrinker *, struct shrink_control *);
  55
  56 /*
  57  * We use the batch lookup interface to iterate over the dquots as it
  58  * currently is the only interface into the radix tree code that allows
  59  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  60  * operations is fine as all callers are used either during mount/umount
  61  * or quotaoff.
  62  */
  63 #define XFS_DQ_LOOKUP_BATCH     32
  64
  65 STATIC int
  66 xfs_qm_dquot_walk(
  67         struct xfs_mount        *mp,
  68         int                     type,
  69         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  70         void                    *data)
  71 {
  72         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  73         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  74         uint32_t                next_index;
  75         int                     last_error = 0;
  76         int                     skipped;
  77         int                     nr_found;
  78
  79 restart:
  80         skipped = 0;
  81         next_index = 0;
  82         nr_found = 0;
  83
  84         while (1) {
  85                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  86                 int             error = 0;
  87                 int             i;
  88
  89                 mutex_lock(&qi->qi_tree_lock);
  90                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  91                                         next_index, XFS_DQ_LOOKUP_BATCH);
  92                 if (!nr_found) {
  93                         mutex_unlock(&qi->qi_tree_lock);
  94                         break;
  95                 }
  96
  97                 for (i = 0; i < nr_found; i++) {
  98                         struct xfs_dquot *dqp = batch[i];
  99
 100                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
 101
 102                         error = execute(batch[i], data);
 103                         if (error == EAGAIN) {
 104                                 skipped++;
 105                                 continue;
 106                         }
 107                         if (error && last_error != EFSCORRUPTED)
 108                                 last_error = error;
 109                 }
 110
 111                 mutex_unlock(&qi->qi_tree_lock);
 112
 113                 /* bail out if the filesystem is corrupted.  */
 114                 if (last_error == EFSCORRUPTED) {
 115                         skipped = 0;
 116                         break;
 117                 }
 118         }
 119
 120         if (skipped) {
 121                 delay(1);
 122                 goto restart;
 123         }
 124
 125         return last_error;
 126 }
 127
 128
 129 /*
 130  * Purge a dquot from all tracking data structures and free it.
 131  */
 132 STATIC int
 133 xfs_qm_dqpurge(
 134         struct xfs_dquot        *dqp,
 135         void                    *data)
 136 {
 137         struct xfs_mount        *mp = dqp->q_mount;
 138         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 139         struct xfs_dquot        *gdqp = NULL;
 140
 141         xfs_dqlock(dqp);
 142         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 143                 xfs_dqunlock(dqp);
 144                 return EAGAIN;
 145         }
 146
 147         /*
 148          * If this quota has a group hint attached, prepare for releasing it
 149          * now.
 150          */
 151         gdqp = dqp->q_gdquot;
 152         if (gdqp) {
 153                 xfs_dqlock(gdqp);
 154                 dqp->q_gdquot = NULL;
 155         }
 156
 157         dqp->dq_flags |= XFS_DQ_FREEING;
 158
 159         xfs_dqflock(dqp);
 160
 161         /*
 162          * If we are turning this type of quotas off, we don't care
 163          * about the dirty metadata sitting in this dquot. OTOH, if
 164          * we're unmounting, we do care, so we flush it and wait.
 165          */
 166         if (XFS_DQ_IS_DIRTY(dqp)) {
 167                 struct xfs_buf  *bp = NULL;
 168                 int             error;
 169
 170                 /*
 171                  * We don't care about getting disk errors here. We need
 172                  * to purge this dquot anyway, so we go ahead regardless.
 173                  */
 174                 error = xfs_qm_dqflush(dqp, &bp);
 175                 if (error) {
 176                         xfs_warn(mp, "%s: dquot %p flush failed",
 177                                 __func__, dqp);
 178                 } else {
 179                         error = xfs_bwrite(bp);
 180                         xfs_buf_relse(bp);
 181                 }
 182                 xfs_dqflock(dqp);
 183         }
 184
 185         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 186         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 187                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 188
 189         xfs_dqfunlock(dqp);
 190         xfs_dqunlock(dqp);
 191
 192         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 193                           be32_to_cpu(dqp->q_core.d_id));
 194         qi->qi_dquots--;
 195
 196         /*
 197          * We move dquots to the freelist as soon as their reference count
 198          * hits zero, so it really should be on the freelist here.
 199          */
 200         mutex_lock(&qi->qi_lru_lock);
 201         ASSERT(!list_empty(&dqp->q_lru));
 202         list_del_init(&dqp->q_lru);
 203         qi->qi_lru_count--;
 204         XFS_STATS_DEC(xs_qm_dquot_unused);
 205         mutex_unlock(&qi->qi_lru_lock);
 206
 207         xfs_qm_dqdestroy(dqp);
 208
 209         if (gdqp)
 210                 xfs_qm_dqput(gdqp);
 211         return 0;
 212 }
 213
 214 /*
 215  * Purge the dquot cache.
 216  */
 217 void
 218 xfs_qm_dqpurge_all(
 219         struct xfs_mount        *mp,
 220         uint                    flags)
 221 {
 222         if (flags & XFS_QMOPT_UQUOTA)
 223                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 224         if (flags & XFS_QMOPT_GQUOTA)
 225                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 226         if (flags & XFS_QMOPT_PQUOTA)
 227                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 228 }
 229
 230 /*
 231  * Just destroy the quotainfo structure.
 232  */
 233 void
 234 xfs_qm_unmount(
 235         struct xfs_mount        *mp)
 236 {
 237         if (mp->m_quotainfo) {
 238                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 239                 xfs_qm_destroy_quotainfo(mp);
 240         }
 241 }
 242
 243
 244 /*
 245  * This is called from xfs_mountfs to start quotas and initialize all
 246  * necessary data structures like quotainfo.  This is also responsible for
 247  * running a quotacheck as necessary.  We are guaranteed that the superblock
 248  * is consistently read in at this point.
 249  *
 250  * If we fail here, the mount will continue with quota turned off. We don't
 251  * need to inidicate success or failure at all.
 252  */
 253 void
 254 xfs_qm_mount_quotas(
 255         xfs_mount_t     *mp)
 256 {
 257         int             error = 0;
 258         uint            sbf;
 259
 260         /*
 261          * If quotas on realtime volumes is not supported, we disable
 262          * quotas immediately.
 263          */
 264         if (mp->m_sb.sb_rextents) {
 265                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
 266                 mp->m_qflags = 0;
 267                 goto write_changes;
 268         }
 269
 270         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 271
 272         /*
 273          * Allocate the quotainfo structure inside the mount struct, and
 274          * create quotainode(s), and change/rev superblock if necessary.
 275          */
 276         error = xfs_qm_init_quotainfo(mp);
 277         if (error) {
 278                 /*
 279                  * We must turn off quotas.
 280                  */
 281                 ASSERT(mp->m_quotainfo == NULL);
 282                 mp->m_qflags = 0;
 283                 goto write_changes;
 284         }
 285         /*
 286          * If any of the quotas are not consistent, do a quotacheck.
 287          */
 288         if (XFS_QM_NEED_QUOTACHECK(mp)) {
 289                 error = xfs_qm_quotacheck(mp);
 290                 if (error) {
 291                         /* Quotacheck failed and disabled quotas. */
 292                         return;
 293                 }
 294         }
 295         /*
 296          * If one type of quotas is off, then it will lose its
 297          * quotachecked status, since we won't be doing accounting for
 298          * that type anymore.
 299          */
 300         if (!XFS_IS_UQUOTA_ON(mp))
 301                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
 302         if (!XFS_IS_GQUOTA_ON(mp))
 303                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
 304         if (!XFS_IS_PQUOTA_ON(mp))
 305                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
 306
 307  write_changes:
 308         /*
 309          * We actually don't have to acquire the m_sb_lock at all.
 310          * This can only be called from mount, and that's single threaded. XXX
 311          */
 312         spin_lock(&mp->m_sb_lock);
 313         sbf = mp->m_sb.sb_qflags;
 314         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
 315         spin_unlock(&mp->m_sb_lock);
 316
 317         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
 318                 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
 319                         /*
 320                          * We could only have been turning quotas off.
 321                          * We aren't in very good shape actually because
 322                          * the incore structures are convinced that quotas are
 323                          * off, but the on disk superblock doesn't know that !
 324                          */
 325                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
 326                         xfs_alert(mp, "%s: Superblock update failed!",
 327                                 __func__);
 328                 }
 329         }
 330
 331         if (error) {
 332                 xfs_warn(mp, "Failed to initialize disk quotas.");
 333                 return;
 334         }
 335 }
 336
 337 /*
 338  * Called from the vfsops layer.
 339  */
 340 void
 341 xfs_qm_unmount_quotas(
 342         xfs_mount_t     *mp)
 343 {
 344         /*
 345          * Release the dquots that root inode, et al might be holding,
 346          * before we flush quotas and blow away the quotainfo structure.
 347          */
 348         ASSERT(mp->m_rootip);
 349         xfs_qm_dqdetach(mp->m_rootip);
 350         if (mp->m_rbmip)
 351                 xfs_qm_dqdetach(mp->m_rbmip);
 352         if (mp->m_rsumip)
 353                 xfs_qm_dqdetach(mp->m_rsumip);
 354
 355         /*
 356          * Release the quota inodes.
 357          */
 358         if (mp->m_quotainfo) {
 359                 if (mp->m_quotainfo->qi_uquotaip) {
 360                         IRELE(mp->m_quotainfo->qi_uquotaip);
 361                         mp->m_quotainfo->qi_uquotaip = NULL;
 362                 }
 363                 if (mp->m_quotainfo->qi_gquotaip) {
 364                         IRELE(mp->m_quotainfo->qi_gquotaip);
 365                         mp->m_quotainfo->qi_gquotaip = NULL;
 366                 }
 367         }
 368 }
 369
 370 STATIC int
 371 xfs_qm_dqattach_one(
 372         xfs_inode_t     *ip,
 373         xfs_dqid_t      id,
 374         uint            type,
 375         uint            doalloc,
 376         xfs_dquot_t     *udqhint, /* hint */
 377         xfs_dquot_t     **IO_idqpp)
 378 {
 379         xfs_dquot_t     *dqp;
 380         int             error;
 381
 382         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 383         error = 0;
 384
 385         /*
 386          * See if we already have it in the inode itself. IO_idqpp is
 387          * &i_udquot or &i_gdquot. This made the code look weird, but
 388          * made the logic a lot simpler.
 389          */
 390         dqp = *IO_idqpp;
 391         if (dqp) {
 392                 trace_xfs_dqattach_found(dqp);
 393                 return 0;
 394         }
 395
 396         /*
 397          * udqhint is the i_udquot field in inode, and is non-NULL only
 398          * when the type arg is group/project. Its purpose is to save a
 399          * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
 400          * the user dquot.
 401          */
 402         if (udqhint) {
 403                 ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 404                 xfs_dqlock(udqhint);
 405
 406                 /*
 407                  * No need to take dqlock to look at the id.
 408                  *
 409                  * The ID can't change until it gets reclaimed, and it won't
 410                  * be reclaimed as long as we have a ref from inode and we
 411                  * hold the ilock.
 412                  */
 413                 dqp = udqhint->q_gdquot;
 414                 if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
 415                         ASSERT(*IO_idqpp == NULL);
 416
 417                         *IO_idqpp = xfs_qm_dqhold(dqp);
 418                         xfs_dqunlock(udqhint);
 419                         return 0;
 420                 }
 421
 422                 /*
 423                  * We can't hold a dquot lock when we call the dqget code.
 424                  * We'll deadlock in no time, because of (not conforming to)
 425                  * lock ordering - the inodelock comes before any dquot lock,
 426                  * and we may drop and reacquire the ilock in xfs_qm_dqget().
 427                  */
 428                 xfs_dqunlock(udqhint);
 429         }
 430
 431         /*
 432          * Find the dquot from somewhere. This bumps the
 433          * reference count of dquot and returns it locked.
 434          * This can return ENOENT if dquot didn't exist on
 435          * disk and we didn't ask it to allocate;
 436          * ESRCH if quotas got turned off suddenly.
 437          */
 438         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 439                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 440         if (error)
 441                 return error;
 442
 443         trace_xfs_dqattach_get(dqp);
 444
 445         /*
 446          * dqget may have dropped and re-acquired the ilock, but it guarantees
 447          * that the dquot returned is the one that should go in the inode.
 448          */
 449         *IO_idqpp = dqp;
 450         xfs_dqunlock(dqp);
 451         return 0;
 452 }
 453
 454
 455 /*
 456  * Given a udquot and gdquot, attach a ptr to the group dquot in the
 457  * udquot as a hint for future lookups.
 458  */
 459 STATIC void
 460 xfs_qm_dqattach_grouphint(
 461         xfs_dquot_t     *udq,
 462         xfs_dquot_t     *gdq)
 463 {
 464         xfs_dquot_t     *tmp;
 465
 466         xfs_dqlock(udq);
 467
 468         tmp = udq->q_gdquot;
 469         if (tmp) {
 470                 if (tmp == gdq)
 471                         goto done;
 472
 473                 udq->q_gdquot = NULL;
 474                 xfs_qm_dqrele(tmp);
 475         }
 476
 477         udq->q_gdquot = xfs_qm_dqhold(gdq);
 478 done:
 479         xfs_dqunlock(udq);
 480 }
 481
 482 static bool
 483 xfs_qm_need_dqattach(
 484         struct xfs_inode        *ip)
 485 {
 486         struct xfs_mount        *mp = ip->i_mount;
 487
 488         if (!XFS_IS_QUOTA_RUNNING(mp))
 489                 return false;
 490         if (!XFS_IS_QUOTA_ON(mp))
 491                 return false;
 492         if (!XFS_NOT_DQATTACHED(mp, ip))
 493                 return false;
 494         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 495                 return false;
 496         return true;
 497 }
 498
 499 /*
 500  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 501  * into account.
 502  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 503  * Inode may get unlocked and relocked in here, and the caller must deal with
 504  * the consequences.
 505  */
 506 int
 507 xfs_qm_dqattach_locked(
 508         xfs_inode_t     *ip,
 509         uint            flags)
 510 {
 511         xfs_mount_t     *mp = ip->i_mount;
 512         uint            nquotas = 0;
 513         int             error = 0;
 514
 515         if (!xfs_qm_need_dqattach(ip))
 516                 return 0;
 517
 518         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 519
 520         if (XFS_IS_UQUOTA_ON(mp)) {
 521                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 522                                                 flags & XFS_QMOPT_DQALLOC,
 523                                                 NULL, &ip->i_udquot);
 524                 if (error)
 525                         goto done;
 526                 nquotas++;
 527         }
 528
 529         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 530         if (XFS_IS_OQUOTA_ON(mp)) {
 531                 error = XFS_IS_GQUOTA_ON(mp) ?
 532                         xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 533                                                 flags & XFS_QMOPT_DQALLOC,
 534                                                 ip->i_udquot, &ip->i_gdquot) :
 535                         xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 536                                                 flags & XFS_QMOPT_DQALLOC,
 537                                                 ip->i_udquot, &ip->i_gdquot);
 538                 /*
 539                  * Don't worry about the udquot that we may have
 540                  * attached above. It'll get detached, if not already.
 541                  */
 542                 if (error)
 543                         goto done;
 544                 nquotas++;
 545         }
 546
 547         /*
 548          * Attach this group quota to the user quota as a hint.
 549          * This WON'T, in general, result in a thrash.
 550          */
 551         if (nquotas == 2) {
 552                 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 553                 ASSERT(ip->i_udquot);
 554                 ASSERT(ip->i_gdquot);
 555
 556                 /*
 557                  * We do not have i_udquot locked at this point, but this check
 558                  * is OK since we don't depend on the i_gdquot to be accurate
 559                  * 100% all the time. It is just a hint, and this will
 560                  * succeed in general.
 561                  */
 562                 if (ip->i_udquot->q_gdquot != ip->i_gdquot)
 563                         xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
 564         }
 565
 566  done:
 567 #ifdef DEBUG
 568         if (!error) {
 569                 if (XFS_IS_UQUOTA_ON(mp))
 570                         ASSERT(ip->i_udquot);
 571                 if (XFS_IS_OQUOTA_ON(mp))
 572                         ASSERT(ip->i_gdquot);
 573         }
 574         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 575 #endif
 576         return error;
 577 }
 578
 579 int
 580 xfs_qm_dqattach(
 581         struct xfs_inode        *ip,
 582         uint                    flags)
 583 {
 584         int                     error;
 585
 586         if (!xfs_qm_need_dqattach(ip))
 587                 return 0;
 588
 589         xfs_ilock(ip, XFS_ILOCK_EXCL);
 590         error = xfs_qm_dqattach_locked(ip, flags);
 591         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 592
 593         return error;
 594 }
 595
 596 /*
 597  * Release dquots (and their references) if any.
 598  * The inode should be locked EXCL except when this's called by
 599  * xfs_ireclaim.
 600  */
 601 void
 602 xfs_qm_dqdetach(
 603         xfs_inode_t     *ip)
 604 {
 605         if (!(ip->i_udquot || ip->i_gdquot))
 606                 return;
 607
 608         trace_xfs_dquot_dqdetach(ip);
 609
 610         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 611         if (ip->i_udquot) {
 612                 xfs_qm_dqrele(ip->i_udquot);
 613                 ip->i_udquot = NULL;
 614         }
 615         if (ip->i_gdquot) {
 616                 xfs_qm_dqrele(ip->i_gdquot);
 617                 ip->i_gdquot = NULL;
 618         }
 619 }
 620
 621 int
 622 xfs_qm_calc_dquots_per_chunk(
 623         struct xfs_mount        *mp,
 624         unsigned int            nbblks) /* basic block units */
 625 {
 626         unsigned int    ndquots;
 627
 628         ASSERT(nbblks > 0);
 629         ndquots = BBTOB(nbblks);
 630         do_div(ndquots, sizeof(xfs_dqblk_t));
 631
 632         return ndquots;
 633 }
 634
 635 /*
 636  * This initializes all the quota information that's kept in the
 637  * mount structure
 638  */
 639 STATIC int
 640 xfs_qm_init_quotainfo(
 641         xfs_mount_t     *mp)
 642 {
 643         xfs_quotainfo_t *qinf;
 644         int             error;
 645         xfs_dquot_t     *dqp;
 646
 647         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 648
 649         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 650
 651         /*
 652          * See if quotainodes are setup, and if not, allocate them,
 653          * and change the superblock accordingly.
 654          */
 655         if ((error = xfs_qm_init_quotainos(mp))) {
 656                 kmem_free(qinf);
 657                 mp->m_quotainfo = NULL;
 658                 return error;
 659         }
 660
 661         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 662         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 663         mutex_init(&qinf->qi_tree_lock);
 664
 665         INIT_LIST_HEAD(&qinf->qi_lru_list);
 666         qinf->qi_lru_count = 0;
 667         mutex_init(&qinf->qi_lru_lock);
 668
 669         /* mutex used to serialize quotaoffs */
 670         mutex_init(&qinf->qi_quotaofflock);
 671
 672         /* Precalc some constants */
 673         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 674         qinf->qi_dqperchunk = xfs_qm_calc_dquots_per_chunk(mp,
 675                                                         qinf->qi_dqchunklen);
 676
 677         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 678
 679         /*
 680          * We try to get the limits from the superuser's limits fields.
 681          * This is quite hacky, but it is standard quota practice.
 682          *
 683          * We look at the USR dquot with id == 0 first, but if user quotas
 684          * are not enabled we goto the GRP dquot with id == 0.
 685          * We don't really care to keep separate default limits for user
 686          * and group quotas, at least not at this point.
 687          *
 688          * Since we may not have done a quotacheck by this point, just read
 689          * the dquot without attaching it to any hashtables or lists.
 690          */
 691         error = xfs_qm_dqread(mp, 0,
 692                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 693                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 694                           XFS_DQ_PROJ),
 695                         XFS_QMOPT_DOWARN, &dqp);
 696         if (!error) {
 697                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 698
 699                 /*
 700                  * The warnings and timers set the grace period given to
 701                  * a user or group before he or she can not perform any
 702                  * more writing. If it is zero, a default is used.
 703                  */
 704                 qinf->qi_btimelimit = ddqp->d_btimer ?
 705                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 706                 qinf->qi_itimelimit = ddqp->d_itimer ?
 707                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 708                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 709                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 710                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 711                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 712                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 713                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 714                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 715                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 716                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 717                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 718                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 719                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 720                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 721                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 722
 723                 xfs_qm_dqdestroy(dqp);
 724         } else {
 725                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 726                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 727                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 728                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 729                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 730                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 731         }
 732
 733         qinf->qi_shrinker.shrink = xfs_qm_shake;
 734         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 735         register_shrinker(&qinf->qi_shrinker);
 736         return 0;
 737 }
 738
 739
 740 /*
 741  * Gets called when unmounting a filesystem or when all quotas get
 742  * turned off.
 743  * This purges the quota inodes, destroys locks and frees itself.
 744  */
 745 void
 746 xfs_qm_destroy_quotainfo(
 747         xfs_mount_t     *mp)
 748 {
 749         xfs_quotainfo_t *qi;
 750
 751         qi = mp->m_quotainfo;
 752         ASSERT(qi != NULL);
 753
 754         unregister_shrinker(&qi->qi_shrinker);
 755
 756         if (qi->qi_uquotaip) {
 757                 IRELE(qi->qi_uquotaip);
 758                 qi->qi_uquotaip = NULL; /* paranoia */
 759         }
 760         if (qi->qi_gquotaip) {
 761                 IRELE(qi->qi_gquotaip);
 762                 qi->qi_gquotaip = NULL;
 763         }
 764         mutex_destroy(&qi->qi_quotaofflock);
 765         kmem_free(qi);
 766         mp->m_quotainfo = NULL;
 767 }
 768
 769 /*
 770  * Create an inode and return with a reference already taken, but unlocked
 771  * This is how we create quota inodes
 772  */
 773 STATIC int
 774 xfs_qm_qino_alloc(
 775         xfs_mount_t     *mp,
 776         xfs_inode_t     **ip,
 777         __int64_t       sbfields,
 778         uint            flags)
 779 {
 780         xfs_trans_t     *tp;
 781         int             error;
 782         int             committed;
 783
 784         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 785         if ((error = xfs_trans_reserve(tp,
 786                                       XFS_QM_QINOCREATE_SPACE_RES(mp),
 787                                       XFS_CREATE_LOG_RES(mp), 0,
 788                                       XFS_TRANS_PERM_LOG_RES,
 789                                       XFS_CREATE_LOG_COUNT))) {
 790                 xfs_trans_cancel(tp, 0);
 791                 return error;
 792         }
 793
 794         error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 795         if (error) {
 796                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 797                                  XFS_TRANS_ABORT);
 798                 return error;
 799         }
 800
 801         /*
 802          * Make the changes in the superblock, and log those too.
 803          * sbfields arg may contain fields other than *QUOTINO;
 804          * VERSIONNUM for example.
 805          */
 806         spin_lock(&mp->m_sb_lock);
 807         if (flags & XFS_QMOPT_SBVERSION) {
 808                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 809                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 810                                    XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 811                        (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 812                         XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 813
 814                 xfs_sb_version_addquota(&mp->m_sb);
 815                 mp->m_sb.sb_uquotino = NULLFSINO;
 816                 mp->m_sb.sb_gquotino = NULLFSINO;
 817
 818                 /* qflags will get updated _after_ quotacheck */
 819                 mp->m_sb.sb_qflags = 0;
 820         }
 821         if (flags & XFS_QMOPT_UQUOTA)
 822                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 823         else
 824                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 825         spin_unlock(&mp->m_sb_lock);
 826         xfs_mod_sb(tp, sbfields);
 827
 828         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 829                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 830                 return error;
 831         }
 832         return 0;
 833 }
 834
 835
 836 STATIC void
 837 xfs_qm_reset_dqcounts(
 838         xfs_mount_t     *mp,
 839         xfs_buf_t       *bp,
 840         xfs_dqid_t      id,
 841         uint            type)
 842 {
 843         struct xfs_dqblk        *dqb;
 844         int                     j;
 845
 846         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 847
 848         /*
 849          * Reset all counters and timers. They'll be
 850          * started afresh by xfs_qm_quotacheck.
 851          */
 852 #ifdef DEBUG
 853         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 854         do_div(j, sizeof(xfs_dqblk_t));
 855         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 856 #endif
 857         dqb = bp->b_addr;
 858         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 859                 struct xfs_disk_dquot   *ddq;
 860
 861                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 862
 863                 /*
 864                  * Do a sanity check, and if needed, repair the dqblk. Don't
 865                  * output any warnings because it's perfectly possible to
 866                  * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 867                  */
 868                 (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 869                                       "xfs_quotacheck");
 870                 ddq->d_bcount = 0;
 871                 ddq->d_icount = 0;
 872                 ddq->d_rtbcount = 0;
 873                 ddq->d_btimer = 0;
 874                 ddq->d_itimer = 0;
 875                 ddq->d_rtbtimer = 0;
 876                 ddq->d_bwarns = 0;
 877                 ddq->d_iwarns = 0;
 878                 ddq->d_rtbwarns = 0;
 879
 880                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 881                         xfs_update_cksum((char *)&dqb[j],
 882                                          sizeof(struct xfs_dqblk),
 883                                          XFS_DQUOT_CRC_OFF);
 884                 }
 885         }
 886 }
 887
 888 STATIC int
 889 xfs_qm_dqiter_bufs(
 890         struct xfs_mount        *mp,
 891         xfs_dqid_t              firstid,
 892         xfs_fsblock_t           bno,
 893         xfs_filblks_t           blkcnt,
 894         uint                    flags,
 895         struct list_head        *buffer_list)
 896 {
 897         struct xfs_buf          *bp;
 898         int                     error;
 899         int                     type;
 900
 901         ASSERT(blkcnt > 0);
 902         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 903                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 904         error = 0;
 905
 906         /*
 907          * Blkcnt arg can be a very big number, and might even be
 908          * larger than the log itself. So, we have to break it up into
 909          * manageable-sized transactions.
 910          * Note that we don't start a permanent transaction here; we might
 911          * not be able to get a log reservation for the whole thing up front,
 912          * and we don't really care to either, because we just discard
 913          * everything if we were to crash in the middle of this loop.
 914          */
 915         while (blkcnt--) {
 916                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 917                               XFS_FSB_TO_DADDR(mp, bno),
 918                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 919                               &xfs_dquot_buf_ops);
 920
 921                 /*
 922                  * CRC and validation errors will return a EFSCORRUPTED here. If
 923                  * this occurs, re-read without CRC validation so that we can
 924                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 925                  * will leave a trace in the log indicating corruption has
 926                  * been detected.
 927                  */
 928                 if (error == EFSCORRUPTED) {
 929                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 930                                       XFS_FSB_TO_DADDR(mp, bno),
 931                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 932                                       NULL);
 933                 }
 934
 935                 if (error)
 936                         break;
 937
 938                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 939                 xfs_buf_delwri_queue(bp, buffer_list);
 940                 xfs_buf_relse(bp);
 941
 942                 /* goto the next block. */
 943                 bno++;
 944                 firstid += mp->m_quotainfo->qi_dqperchunk;
 945         }
 946
 947         return error;
 948 }
 949
 950 /*
 951  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 952  * caller supplied function for every chunk of dquots that we find.
 953  */
 954 STATIC int
 955 xfs_qm_dqiterate(
 956         struct xfs_mount        *mp,
 957         struct xfs_inode        *qip,
 958         uint                    flags,
 959         struct list_head        *buffer_list)
 960 {
 961         struct xfs_bmbt_irec    *map;
 962         int                     i, nmaps;       /* number of map entries */
 963         int                     error;          /* return value */
 964         xfs_fileoff_t           lblkno;
 965         xfs_filblks_t           maxlblkcnt;
 966         xfs_dqid_t              firstid;
 967         xfs_fsblock_t           rablkno;
 968         xfs_filblks_t           rablkcnt;
 969
 970         error = 0;
 971         /*
 972          * This looks racy, but we can't keep an inode lock across a
 973          * trans_reserve. But, this gets called during quotacheck, and that
 974          * happens only at mount time which is single threaded.
 975          */
 976         if (qip->i_d.di_nblocks == 0)
 977                 return 0;
 978
 979         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 980
 981         lblkno = 0;
 982         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 983         do {
 984                 nmaps = XFS_DQITER_MAP_SIZE;
 985                 /*
 986                  * We aren't changing the inode itself. Just changing
 987                  * some of its data. No new blocks are added here, and
 988                  * the inode is never added to the transaction.
 989                  */
 990                 xfs_ilock(qip, XFS_ILOCK_SHARED);
 991                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 992                                        map, &nmaps, 0);
 993                 xfs_iunlock(qip, XFS_ILOCK_SHARED);
 994                 if (error)
 995                         break;
 996
 997                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 998                 for (i = 0; i < nmaps; i++) {
 999                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1000                         ASSERT(map[i].br_blockcount);
1001
1002
1003                         lblkno += map[i].br_blockcount;
1004
1005                         if (map[i].br_startblock == HOLESTARTBLOCK)
1006                                 continue;
1007
1008                         firstid = (xfs_dqid_t) map[i].br_startoff *
1009                                 mp->m_quotainfo->qi_dqperchunk;
1010                         /*
1011                          * Do a read-ahead on the next extent.
1012                          */
1013                         if ((i+1 < nmaps) &&
1014                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1015                                 rablkcnt =  map[i+1].br_blockcount;
1016                                 rablkno = map[i+1].br_startblock;
1017                                 while (rablkcnt--) {
1018                                         xfs_buf_readahead(mp->m_ddev_targp,
1019                                                XFS_FSB_TO_DADDR(mp, rablkno),
1020                                                mp->m_quotainfo->qi_dqchunklen,
1021                                                NULL);
1022                                         rablkno++;
1023                                 }
1024                         }
1025                         /*
1026                          * Iterate thru all the blks in the extent and
1027                          * reset the counters of all the dquots inside them.
1028                          */
1029                         error = xfs_qm_dqiter_bufs(mp, firstid,
1030                                                    map[i].br_startblock,
1031                                                    map[i].br_blockcount,
1032                                                    flags, buffer_list);
1033                         if (error)
1034                                 goto out;
1035                 }
1036         } while (nmaps > 0);
1037
1038 out:
1039         kmem_free(map);
1040         return error;
1041 }
1042
1043 /*
1044  * Called by dqusage_adjust in doing a quotacheck.
1045  *
1046  * Given the inode, and a dquot id this updates both the incore dqout as well
1047  * as the buffer copy. This is so that once the quotacheck is done, we can
1048  * just log all the buffers, as opposed to logging numerous updates to
1049  * individual dquots.
1050  */
1051 STATIC int
1052 xfs_qm_quotacheck_dqadjust(
1053         struct xfs_inode        *ip,
1054         xfs_dqid_t              id,
1055         uint                    type,
1056         xfs_qcnt_t              nblks,
1057         xfs_qcnt_t              rtblks)
1058 {
1059         struct xfs_mount        *mp = ip->i_mount;
1060         struct xfs_dquot        *dqp;
1061         int                     error;
1062
1063         error = xfs_qm_dqget(mp, ip, id, type,
1064                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1065         if (error) {
1066                 /*
1067                  * Shouldn't be able to turn off quotas here.
1068                  */
1069                 ASSERT(error != ESRCH);
1070                 ASSERT(error != ENOENT);
1071                 return error;
1072         }
1073
1074         trace_xfs_dqadjust(dqp);
1075
1076         /*
1077          * Adjust the inode count and the block count to reflect this inode's
1078          * resource usage.
1079          */
1080         be64_add_cpu(&dqp->q_core.d_icount, 1);
1081         dqp->q_res_icount++;
1082         if (nblks) {
1083                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1084                 dqp->q_res_bcount += nblks;
1085         }
1086         if (rtblks) {
1087                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1088                 dqp->q_res_rtbcount += rtblks;
1089         }
1090
1091         /*
1092          * Set default limits, adjust timers (since we changed usages)
1093          *
1094          * There are no timers for the default values set in the root dquot.
1095          */
1096         if (dqp->q_core.d_id) {
1097                 xfs_qm_adjust_dqlimits(mp, dqp);
1098                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1099         }
1100
1101         dqp->dq_flags |= XFS_DQ_DIRTY;
1102         xfs_qm_dqput(dqp);
1103         return 0;
1104 }
1105
1106 STATIC int
1107 xfs_qm_get_rtblks(
1108         xfs_inode_t     *ip,
1109         xfs_qcnt_t      *O_rtblks)
1110 {
1111         xfs_filblks_t   rtblks;                 /* total rt blks */
1112         xfs_extnum_t    idx;                    /* extent record index */
1113         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1114         xfs_extnum_t    nextents;               /* number of extent entries */
1115         int             error;
1116
1117         ASSERT(XFS_IS_REALTIME_INODE(ip));
1118         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1119         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1120                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1121                         return error;
1122         }
1123         rtblks = 0;
1124         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1125         for (idx = 0; idx < nextents; idx++)
1126                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1127         *O_rtblks = (xfs_qcnt_t)rtblks;
1128         return 0;
1129 }
1130
1131 /*
1132  * callback routine supplied to bulkstat(). Given an inumber, find its
1133  * dquots and update them to account for resources taken by that inode.
1134  */
1135 /* ARGSUSED */
1136 STATIC int
1137 xfs_qm_dqusage_adjust(
1138         xfs_mount_t     *mp,            /* mount point for filesystem */
1139         xfs_ino_t       ino,            /* inode number to get data for */
1140         void            __user *buffer, /* not used */
1141         int             ubsize,         /* not used */
1142         int             *ubused,        /* not used */
1143         int             *res)           /* result code value */
1144 {
1145         xfs_inode_t     *ip;
1146         xfs_qcnt_t      nblks, rtblks = 0;
1147         int             error;
1148
1149         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1150
1151         /*
1152          * rootino must have its resources accounted for, not so with the quota
1153          * inodes.
1154          */
1155         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1156                 *res = BULKSTAT_RV_NOTHING;
1157                 return XFS_ERROR(EINVAL);
1158         }
1159
1160         /*
1161          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1162          * interface expects the inode to be exclusively locked because that's
1163          * the case in all other instances. It's OK that we do this because
1164          * quotacheck is done only at mount time.
1165          */
1166         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1167         if (error) {
1168                 *res = BULKSTAT_RV_NOTHING;
1169                 return error;
1170         }
1171
1172         ASSERT(ip->i_delayed_blks == 0);
1173
1174         if (XFS_IS_REALTIME_INODE(ip)) {
1175                 /*
1176                  * Walk thru the extent list and count the realtime blocks.
1177                  */
1178                 error = xfs_qm_get_rtblks(ip, &rtblks);
1179                 if (error)
1180                         goto error0;
1181         }
1182
1183         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1184
1185         /*
1186          * Add the (disk blocks and inode) resources occupied by this
1187          * inode to its dquots. We do this adjustment in the incore dquot,
1188          * and also copy the changes to its buffer.
1189          * We don't care about putting these changes in a transaction
1190          * envelope because if we crash in the middle of a 'quotacheck'
1191          * we have to start from the beginning anyway.
1192          * Once we're done, we'll log all the dquot bufs.
1193          *
1194          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1195          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1196          */
1197         if (XFS_IS_UQUOTA_ON(mp)) {
1198                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1199                                                    XFS_DQ_USER, nblks, rtblks);
1200                 if (error)
1201                         goto error0;
1202         }
1203
1204         if (XFS_IS_GQUOTA_ON(mp)) {
1205                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1206                                                    XFS_DQ_GROUP, nblks, rtblks);
1207                 if (error)
1208                         goto error0;
1209         }
1210
1211         if (XFS_IS_PQUOTA_ON(mp)) {
1212                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1213                                                    XFS_DQ_PROJ, nblks, rtblks);
1214                 if (error)
1215                         goto error0;
1216         }
1217
1218         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1219         IRELE(ip);
1220         *res = BULKSTAT_RV_DIDONE;
1221         return 0;
1222
1223 error0:
1224         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1225         IRELE(ip);
1226         *res = BULKSTAT_RV_GIVEUP;
1227         return error;
1228 }
1229
1230 STATIC int
1231 xfs_qm_flush_one(
1232         struct xfs_dquot        *dqp,
1233         void                    *data)
1234 {
1235         struct list_head        *buffer_list = data;
1236         struct xfs_buf          *bp = NULL;
1237         int                     error = 0;
1238
1239         xfs_dqlock(dqp);
1240         if (dqp->dq_flags & XFS_DQ_FREEING)
1241                 goto out_unlock;
1242         if (!XFS_DQ_IS_DIRTY(dqp))
1243                 goto out_unlock;
1244
1245         xfs_dqflock(dqp);
1246         error = xfs_qm_dqflush(dqp, &bp);
1247         if (error)
1248                 goto out_unlock;
1249
1250         xfs_buf_delwri_queue(bp, buffer_list);
1251         xfs_buf_relse(bp);
1252 out_unlock:
1253         xfs_dqunlock(dqp);
1254         return error;
1255 }
1256
1257 /*
1258  * Walk thru all the filesystem inodes and construct a consistent view
1259  * of the disk quota world. If the quotacheck fails, disable quotas.
1260  */
1261 int
1262 xfs_qm_quotacheck(
1263         xfs_mount_t     *mp)
1264 {
1265         int                     done, count, error, error2;
1266         xfs_ino_t               lastino;
1267         size_t                  structsz;
1268         uint                    flags;
1269         LIST_HEAD               (buffer_list);
1270         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1271         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1272
1273         count = INT_MAX;
1274         structsz = 1;
1275         lastino = 0;
1276         flags = 0;
1277
1278         ASSERT(uip || gip);
1279         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1280
1281         xfs_notice(mp, "Quotacheck needed: Please wait.");
1282
1283         /*
1284          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1285          * their counters to zero. We need a clean slate.
1286          * We don't log our changes till later.
1287          */
1288         if (uip) {
1289                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1290                                          &buffer_list);
1291                 if (error)
1292                         goto error_return;
1293                 flags |= XFS_UQUOTA_CHKD;
1294         }
1295
1296         if (gip) {
1297                 error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1298                                          XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA,
1299                                          &buffer_list);
1300                 if (error)
1301                         goto error_return;
1302                 flags |= XFS_IS_GQUOTA_ON(mp) ?
1303                                         XFS_GQUOTA_CHKD : XFS_PQUOTA_CHKD;
1304         }
1305
1306         do {
1307                 /*
1308                  * Iterate thru all the inodes in the file system,
1309                  * adjusting the corresponding dquot counters in core.
1310                  */
1311                 error = xfs_bulkstat(mp, &lastino, &count,
1312                                      xfs_qm_dqusage_adjust,
1313                                      structsz, NULL, &done);
1314                 if (error)
1315                         break;
1316
1317         } while (!done);
1318
1319         /*
1320          * We've made all the changes that we need to make incore.  Flush them
1321          * down to disk buffers if everything was updated successfully.
1322          */
1323         if (XFS_IS_UQUOTA_ON(mp)) {
1324                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1325                                           &buffer_list);
1326         }
1327         if (XFS_IS_GQUOTA_ON(mp)) {
1328                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1329                                            &buffer_list);
1330                 if (!error)
1331                         error = error2;
1332         }
1333         if (XFS_IS_PQUOTA_ON(mp)) {
1334                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1335                                            &buffer_list);
1336                 if (!error)
1337                         error = error2;
1338         }
1339
1340         error2 = xfs_buf_delwri_submit(&buffer_list);
1341         if (!error)
1342                 error = error2;
1343
1344         /*
1345          * We can get this error if we couldn't do a dquot allocation inside
1346          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1347          * dirty dquots that might be cached, we just want to get rid of them
1348          * and turn quotaoff. The dquots won't be attached to any of the inodes
1349          * at this point (because we intentionally didn't in dqget_noattach).
1350          */
1351         if (error) {
1352                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1353                 goto error_return;
1354         }
1355
1356         /*
1357          * If one type of quotas is off, then it will lose its
1358          * quotachecked status, since we won't be doing accounting for
1359          * that type anymore.
1360          */
1361         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1362         mp->m_qflags |= flags;
1363
1364  error_return:
1365         while (!list_empty(&buffer_list)) {
1366                 struct xfs_buf *bp =
1367                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1368                 list_del_init(&bp->b_list);
1369                 xfs_buf_relse(bp);
1370         }
1371
1372         if (error) {
1373                 xfs_warn(mp,
1374         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1375                         error);
1376                 /*
1377                  * We must turn off quotas.
1378                  */
1379                 ASSERT(mp->m_quotainfo != NULL);
1380                 xfs_qm_destroy_quotainfo(mp);
1381                 if (xfs_mount_reset_sbqflags(mp)) {
1382                         xfs_warn(mp,
1383                                 "Quotacheck: Failed to reset quota flags.");
1384                 }
1385         } else
1386                 xfs_notice(mp, "Quotacheck: Done.");
1387         return (error);
1388 }
1389
1390 /*
1391  * This is called after the superblock has been read in and we're ready to
1392  * iget the quota inodes.
1393  */
1394 STATIC int
1395 xfs_qm_init_quotainos(
1396         xfs_mount_t     *mp)
1397 {
1398         struct xfs_inode        *uip = NULL;
1399         struct xfs_inode        *gip = NULL;
1400         int                     error;
1401         __int64_t               sbflags = 0;
1402         uint                    flags = 0;
1403
1404         ASSERT(mp->m_quotainfo);
1405
1406         /*
1407          * Get the uquota and gquota inodes
1408          */
1409         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1410                 if (XFS_IS_UQUOTA_ON(mp) &&
1411                     mp->m_sb.sb_uquotino != NULLFSINO) {
1412                         ASSERT(mp->m_sb.sb_uquotino > 0);
1413                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1414                                              0, 0, &uip);
1415                         if (error)
1416                                 return XFS_ERROR(error);
1417                 }
1418                 if (XFS_IS_OQUOTA_ON(mp) &&
1419                     mp->m_sb.sb_gquotino != NULLFSINO) {
1420                         ASSERT(mp->m_sb.sb_gquotino > 0);
1421                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1422                                              0, 0, &gip);
1423                         if (error)
1424                                 goto error_rele;
1425                 }
1426         } else {
1427                 flags |= XFS_QMOPT_SBVERSION;
1428                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1429                             XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1430         }
1431
1432         /*
1433          * Create the two inodes, if they don't exist already. The changes
1434          * made above will get added to a transaction and logged in one of
1435          * the qino_alloc calls below.  If the device is readonly,
1436          * temporarily switch to read-write to do this.
1437          */
1438         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1439                 error = xfs_qm_qino_alloc(mp, &uip,
1440                                               sbflags | XFS_SB_UQUOTINO,
1441                                               flags | XFS_QMOPT_UQUOTA);
1442                 if (error)
1443                         goto error_rele;
1444
1445                 flags &= ~XFS_QMOPT_SBVERSION;
1446         }
1447         if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1448                 flags |= (XFS_IS_GQUOTA_ON(mp) ?
1449                                 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1450                 error = xfs_qm_qino_alloc(mp, &gip,
1451                                           sbflags | XFS_SB_GQUOTINO, flags);
1452                 if (error)
1453                         goto error_rele;
1454         }
1455
1456         mp->m_quotainfo->qi_uquotaip = uip;
1457         mp->m_quotainfo->qi_gquotaip = gip;
1458
1459         return 0;
1460
1461 error_rele:
1462         if (uip)
1463                 IRELE(uip);
1464         if (gip)
1465                 IRELE(gip);
1466         return XFS_ERROR(error);
1467 }
1468
1469 STATIC void
1470 xfs_qm_dqfree_one(
1471         struct xfs_dquot        *dqp)
1472 {
1473         struct xfs_mount        *mp = dqp->q_mount;
1474         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1475
1476         mutex_lock(&qi->qi_tree_lock);
1477         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1478                           be32_to_cpu(dqp->q_core.d_id));
1479
1480         qi->qi_dquots--;
1481         mutex_unlock(&qi->qi_tree_lock);
1482
1483         xfs_qm_dqdestroy(dqp);
1484 }
1485
1486 STATIC void
1487 xfs_qm_dqreclaim_one(
1488         struct xfs_dquot        *dqp,
1489         struct list_head        *buffer_list,
1490         struct list_head        *dispose_list)
1491 {
1492         struct xfs_mount        *mp = dqp->q_mount;
1493         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1494         int                     error;
1495
1496         if (!xfs_dqlock_nowait(dqp))
1497                 goto out_move_tail;
1498
1499         /*
1500          * This dquot has acquired a reference in the meantime remove it from
1501          * the freelist and try again.
1502          */
1503         if (dqp->q_nrefs) {
1504                 xfs_dqunlock(dqp);
1505
1506                 trace_xfs_dqreclaim_want(dqp);
1507                 XFS_STATS_INC(xs_qm_dqwants);
1508
1509                 list_del_init(&dqp->q_lru);
1510                 qi->qi_lru_count--;
1511                 XFS_STATS_DEC(xs_qm_dquot_unused);
1512                 return;
1513         }
1514
1515         /*
1516          * Try to grab the flush lock. If this dquot is in the process of
1517          * getting flushed to disk, we don't want to reclaim it.
1518          */
1519         if (!xfs_dqflock_nowait(dqp))
1520                 goto out_unlock_move_tail;
1521
1522         if (XFS_DQ_IS_DIRTY(dqp)) {
1523                 struct xfs_buf  *bp = NULL;
1524
1525                 trace_xfs_dqreclaim_dirty(dqp);
1526
1527                 error = xfs_qm_dqflush(dqp, &bp);
1528                 if (error) {
1529                         xfs_warn(mp, "%s: dquot %p flush failed",
1530                                  __func__, dqp);
1531                         goto out_unlock_move_tail;
1532                 }
1533
1534                 xfs_buf_delwri_queue(bp, buffer_list);
1535                 xfs_buf_relse(bp);
1536                 /*
1537                  * Give the dquot another try on the freelist, as the
1538                  * flushing will take some time.
1539                  */
1540                 goto out_unlock_move_tail;
1541         }
1542         xfs_dqfunlock(dqp);
1543
1544         /*
1545          * Prevent lookups now that we are past the point of no return.
1546          */
1547         dqp->dq_flags |= XFS_DQ_FREEING;
1548         xfs_dqunlock(dqp);
1549
1550         ASSERT(dqp->q_nrefs == 0);
1551         list_move_tail(&dqp->q_lru, dispose_list);
1552         qi->qi_lru_count--;
1553         XFS_STATS_DEC(xs_qm_dquot_unused);
1554
1555         trace_xfs_dqreclaim_done(dqp);
1556         XFS_STATS_INC(xs_qm_dqreclaims);
1557         return;
1558
1559         /*
1560          * Move the dquot to the tail of the list so that we don't spin on it.
1561          */
1562 out_unlock_move_tail:
1563         xfs_dqunlock(dqp);
1564 out_move_tail:
1565         list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1566         trace_xfs_dqreclaim_busy(dqp);
1567         XFS_STATS_INC(xs_qm_dqreclaim_misses);
1568 }
1569
1570 STATIC int
1571 xfs_qm_shake(
1572         struct shrinker         *shrink,
1573         struct shrink_control   *sc)
1574 {
1575         struct xfs_quotainfo    *qi =
1576                 container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1577         int                     nr_to_scan = sc->nr_to_scan;
1578         LIST_HEAD               (buffer_list);
1579         LIST_HEAD               (dispose_list);
1580         struct xfs_dquot        *dqp;
1581         int                     error;
1582
1583         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1584                 return 0;
1585         if (!nr_to_scan)
1586                 goto out;
1587
1588         mutex_lock(&qi->qi_lru_lock);
1589         while (!list_empty(&qi->qi_lru_list)) {
1590                 if (nr_to_scan-- <= 0)
1591                         break;
1592                 dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1593                                        q_lru);
1594                 xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
1595         }
1596         mutex_unlock(&qi->qi_lru_lock);
1597
1598         error = xfs_buf_delwri_submit(&buffer_list);
1599         if (error)
1600                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
1601
1602         while (!list_empty(&dispose_list)) {
1603                 dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1604                 list_del_init(&dqp->q_lru);
1605                 xfs_qm_dqfree_one(dqp);
1606         }
1607
1608 out:
1609         return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1610 }
1611
1612 /*
1613  * Start a transaction and write the incore superblock changes to
1614  * disk. flags parameter indicates which fields have changed.
1615  */
1616 int
1617 xfs_qm_write_sb_changes(
1618         xfs_mount_t     *mp,
1619         __int64_t       flags)
1620 {
1621         xfs_trans_t     *tp;
1622         int             error;
1623
1624         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1625         error = xfs_trans_reserve(tp, 0, XFS_QM_SBCHANGE_LOG_RES(mp),
1626                                   0, 0, XFS_DEFAULT_LOG_COUNT);
1627         if (error) {
1628                 xfs_trans_cancel(tp, 0);
1629                 return error;
1630         }
1631
1632         xfs_mod_sb(tp, flags);
1633         error = xfs_trans_commit(tp, 0);
1634
1635         return error;
1636 }
1637
1638
1639 /* --------------- utility functions for vnodeops ---------------- */
1640
1641
1642 /*
1643  * Given an inode, a uid, gid and prid make sure that we have
1644  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1645  * quotas by creating this file.
1646  * This also attaches dquot(s) to the given inode after locking it,
1647  * and returns the dquots corresponding to the uid and/or gid.
1648  *
1649  * in   : inode (unlocked)
1650  * out  : udquot, gdquot with references taken and unlocked
1651  */
1652 int
1653 xfs_qm_vop_dqalloc(
1654         struct xfs_inode        *ip,
1655         uid_t                   uid,
1656         gid_t                   gid,
1657         prid_t                  prid,
1658         uint                    flags,
1659         struct xfs_dquot        **O_udqpp,
1660         struct xfs_dquot        **O_gdqpp)
1661 {
1662         struct xfs_mount        *mp = ip->i_mount;
1663         struct xfs_dquot        *uq = NULL;
1664         struct xfs_dquot        *gq = NULL;
1665         int                     error;
1666         uint                    lockflags;
1667
1668         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1669                 return 0;
1670
1671         lockflags = XFS_ILOCK_EXCL;
1672         xfs_ilock(ip, lockflags);
1673
1674         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1675                 gid = ip->i_d.di_gid;
1676
1677         /*
1678          * Attach the dquot(s) to this inode, doing a dquot allocation
1679          * if necessary. The dquot(s) will not be locked.
1680          */
1681         if (XFS_NOT_DQATTACHED(mp, ip)) {
1682                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1683                 if (error) {
1684                         xfs_iunlock(ip, lockflags);
1685                         return error;
1686                 }
1687         }
1688
1689         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1690                 if (ip->i_d.di_uid != uid) {
1691                         /*
1692                          * What we need is the dquot that has this uid, and
1693                          * if we send the inode to dqget, the uid of the inode
1694                          * takes priority over what's sent in the uid argument.
1695                          * We must unlock inode here before calling dqget if
1696                          * we're not sending the inode, because otherwise
1697                          * we'll deadlock by doing trans_reserve while
1698                          * holding ilock.
1699                          */
1700                         xfs_iunlock(ip, lockflags);
1701                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1702                                                  XFS_DQ_USER,
1703                                                  XFS_QMOPT_DQALLOC |
1704                                                  XFS_QMOPT_DOWARN,
1705                                                  &uq);
1706                         if (error) {
1707                                 ASSERT(error != ENOENT);
1708                                 return error;
1709                         }
1710                         /*
1711                          * Get the ilock in the right order.
1712                          */
1713                         xfs_dqunlock(uq);
1714                         lockflags = XFS_ILOCK_SHARED;
1715                         xfs_ilock(ip, lockflags);
1716                 } else {
1717                         /*
1718                          * Take an extra reference, because we'll return
1719                          * this to caller
1720                          */
1721                         ASSERT(ip->i_udquot);
1722                         uq = xfs_qm_dqhold(ip->i_udquot);
1723                 }
1724         }
1725         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1726                 if (ip->i_d.di_gid != gid) {
1727                         xfs_iunlock(ip, lockflags);
1728                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1729                                                  XFS_DQ_GROUP,
1730                                                  XFS_QMOPT_DQALLOC |
1731                                                  XFS_QMOPT_DOWARN,
1732                                                  &gq);
1733                         if (error) {
1734                                 ASSERT(error != ENOENT);
1735                                 goto error_rele;
1736                         }
1737                         xfs_dqunlock(gq);
1738                         lockflags = XFS_ILOCK_SHARED;
1739                         xfs_ilock(ip, lockflags);
1740                 } else {
1741                         ASSERT(ip->i_gdquot);
1742                         gq = xfs_qm_dqhold(ip->i_gdquot);
1743                 }
1744         } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1745                 if (xfs_get_projid(ip) != prid) {
1746                         xfs_iunlock(ip, lockflags);
1747                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1748                                                  XFS_DQ_PROJ,
1749                                                  XFS_QMOPT_DQALLOC |
1750                                                  XFS_QMOPT_DOWARN,
1751                                                  &gq);
1752                         if (error) {
1753                                 ASSERT(error != ENOENT);
1754                                 goto error_rele;
1755                         }
1756                         xfs_dqunlock(gq);
1757                         lockflags = XFS_ILOCK_SHARED;
1758                         xfs_ilock(ip, lockflags);
1759                 } else {
1760                         ASSERT(ip->i_gdquot);
1761                         gq = xfs_qm_dqhold(ip->i_gdquot);
1762                 }
1763         }
1764         if (uq)
1765                 trace_xfs_dquot_dqalloc(ip);
1766
1767         xfs_iunlock(ip, lockflags);
1768         if (O_udqpp)
1769                 *O_udqpp = uq;
1770         else if (uq)
1771                 xfs_qm_dqrele(uq);
1772         if (O_gdqpp)
1773                 *O_gdqpp = gq;
1774         else if (gq)
1775                 xfs_qm_dqrele(gq);
1776         return 0;
1777
1778 error_rele:
1779         if (uq)
1780                 xfs_qm_dqrele(uq);
1781         return error;
1782 }
1783
1784 /*
1785  * Actually transfer ownership, and do dquot modifications.
1786  * These were already reserved.
1787  */
1788 xfs_dquot_t *
1789 xfs_qm_vop_chown(
1790         xfs_trans_t     *tp,
1791         xfs_inode_t     *ip,
1792         xfs_dquot_t     **IO_olddq,
1793         xfs_dquot_t     *newdq)
1794 {
1795         xfs_dquot_t     *prevdq;
1796         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1797                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1798
1799
1800         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1801         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1802
1803         /* old dquot */
1804         prevdq = *IO_olddq;
1805         ASSERT(prevdq);
1806         ASSERT(prevdq != newdq);
1807
1808         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1809         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1810
1811         /* the sparkling new dquot */
1812         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1813         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1814
1815         /*
1816          * Take an extra reference, because the inode is going to keep
1817          * this dquot pointer even after the trans_commit.
1818          */
1819         *IO_olddq = xfs_qm_dqhold(newdq);
1820
1821         return prevdq;
1822 }
1823
1824 /*
1825  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1826  */
1827 int
1828 xfs_qm_vop_chown_reserve(
1829         struct xfs_trans        *tp,
1830         struct xfs_inode        *ip,
1831         struct xfs_dquot        *udqp,
1832         struct xfs_dquot        *gdqp,
1833         uint                    flags)
1834 {
1835         struct xfs_mount        *mp = ip->i_mount;
1836         uint                    delblks, blkflags, prjflags = 0;
1837         struct xfs_dquot        *udq_unres = NULL;
1838         struct xfs_dquot        *gdq_unres = NULL;
1839         struct xfs_dquot        *udq_delblks = NULL;
1840         struct xfs_dquot        *gdq_delblks = NULL;
1841         int                     error;
1842
1843
1844         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1845         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1846
1847         delblks = ip->i_delayed_blks;
1848         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1849                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1850
1851         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1852             ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1853                 udq_delblks = udqp;
1854                 /*
1855                  * If there are delayed allocation blocks, then we have to
1856                  * unreserve those from the old dquot, and add them to the
1857                  * new dquot.
1858                  */
1859                 if (delblks) {
1860                         ASSERT(ip->i_udquot);
1861                         udq_unres = ip->i_udquot;
1862                 }
1863         }
1864         if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
1865                 if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
1866                      xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
1867                         prjflags = XFS_QMOPT_ENOSPC;
1868
1869                 if (prjflags ||
1870                     (XFS_IS_GQUOTA_ON(ip->i_mount) &&
1871                      ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
1872                         gdq_delblks = gdqp;
1873                         if (delblks) {
1874                                 ASSERT(ip->i_gdquot);
1875                                 gdq_unres = ip->i_gdquot;
1876                         }
1877                 }
1878         }
1879
1880         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1881                                 udq_delblks, gdq_delblks, ip->i_d.di_nblocks, 1,
1882                                 flags | blkflags | prjflags);
1883         if (error)
1884                 return error;
1885
1886         /*
1887          * Do the delayed blks reservations/unreservations now. Since, these
1888          * are done without the help of a transaction, if a reservation fails
1889          * its previous reservations won't be automatically undone by trans
1890          * code. So, we have to do it manually here.
1891          */
1892         if (delblks) {
1893                 /*
1894                  * Do the reservations first. Unreservation can't fail.
1895                  */
1896                 ASSERT(udq_delblks || gdq_delblks);
1897                 ASSERT(udq_unres || gdq_unres);
1898                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1899                             udq_delblks, gdq_delblks, (xfs_qcnt_t)delblks, 0,
1900                             flags | blkflags | prjflags);
1901                 if (error)
1902                         return error;
1903                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1904                                 udq_unres, gdq_unres, -((xfs_qcnt_t)delblks), 0,
1905                                 blkflags);
1906         }
1907
1908         return (0);
1909 }
1910
1911 int
1912 xfs_qm_vop_rename_dqattach(
1913         struct xfs_inode        **i_tab)
1914 {
1915         struct xfs_mount        *mp = i_tab[0]->i_mount;
1916         int                     i;
1917
1918         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1919                 return 0;
1920
1921         for (i = 0; (i < 4 && i_tab[i]); i++) {
1922                 struct xfs_inode        *ip = i_tab[i];
1923                 int                     error;
1924
1925                 /*
1926                  * Watch out for duplicate entries in the table.
1927                  */
1928                 if (i == 0 || ip != i_tab[i-1]) {
1929                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1930                                 error = xfs_qm_dqattach(ip, 0);
1931                                 if (error)
1932                                         return error;
1933                         }
1934                 }
1935         }
1936         return 0;
1937 }
1938
1939 void
1940 xfs_qm_vop_create_dqattach(
1941         struct xfs_trans        *tp,
1942         struct xfs_inode        *ip,
1943         struct xfs_dquot        *udqp,
1944         struct xfs_dquot        *gdqp)
1945 {
1946         struct xfs_mount        *mp = tp->t_mountp;
1947
1948         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1949                 return;
1950
1951         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1952         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1953
1954         if (udqp) {
1955                 ASSERT(ip->i_udquot == NULL);
1956                 ASSERT(XFS_IS_UQUOTA_ON(mp));
1957                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1958
1959                 ip->i_udquot = xfs_qm_dqhold(udqp);
1960                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1961         }
1962         if (gdqp) {
1963                 ASSERT(ip->i_gdquot == NULL);
1964                 ASSERT(XFS_IS_OQUOTA_ON(mp));
1965                 ASSERT((XFS_IS_GQUOTA_ON(mp) ?
1966                         ip->i_d.di_gid : xfs_get_projid(ip)) ==
1967                                 be32_to_cpu(gdqp->q_core.d_id));
1968
1969                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1970                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1971         }
1972 }
1973