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