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
 487 /*
 488  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 489  * into account.
 490  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 491  * Inode may get unlocked and relocked in here, and the caller must deal with
 492  * the consequences.
 493  */
 494 int
 495 xfs_qm_dqattach_locked(
 496         xfs_inode_t     *ip,
 497         uint            flags)
 498 {
 499         xfs_mount_t     *mp = ip->i_mount;
 500         uint            nquotas = 0;
 501         int             error = 0;
 502
 503         if (!XFS_IS_QUOTA_RUNNING(mp) ||
 504             !XFS_IS_QUOTA_ON(mp) ||
 505             !XFS_NOT_DQATTACHED(mp, ip) ||
 506             ip->i_ino == mp->m_sb.sb_uquotino ||
 507             ip->i_ino == mp->m_sb.sb_gquotino)
 508                 return 0;
 509
 510         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 511
 512         if (XFS_IS_UQUOTA_ON(mp)) {
 513                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 514                                                 flags & XFS_QMOPT_DQALLOC,
 515                                                 NULL, &ip->i_udquot);
 516                 if (error)
 517                         goto done;
 518                 nquotas++;
 519         }
 520
 521         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 522         if (XFS_IS_OQUOTA_ON(mp)) {
 523                 error = XFS_IS_GQUOTA_ON(mp) ?
 524                         xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 525                                                 flags & XFS_QMOPT_DQALLOC,
 526                                                 ip->i_udquot, &ip->i_gdquot) :
 527                         xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 528                                                 flags & XFS_QMOPT_DQALLOC,
 529                                                 ip->i_udquot, &ip->i_gdquot);
 530                 /*
 531                  * Don't worry about the udquot that we may have
 532                  * attached above. It'll get detached, if not already.
 533                  */
 534                 if (error)
 535                         goto done;
 536                 nquotas++;
 537         }
 538
 539         /*
 540          * Attach this group quota to the user quota as a hint.
 541          * This WON'T, in general, result in a thrash.
 542          */
 543         if (nquotas == 2) {
 544                 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 545                 ASSERT(ip->i_udquot);
 546                 ASSERT(ip->i_gdquot);
 547
 548                 /*
 549                  * We do not have i_udquot locked at this point, but this check
 550                  * is OK since we don't depend on the i_gdquot to be accurate
 551                  * 100% all the time. It is just a hint, and this will
 552                  * succeed in general.
 553                  */
 554                 if (ip->i_udquot->q_gdquot != ip->i_gdquot)
 555                         xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
 556         }
 557
 558  done:
 559 #ifdef DEBUG
 560         if (!error) {
 561                 if (XFS_IS_UQUOTA_ON(mp))
 562                         ASSERT(ip->i_udquot);
 563                 if (XFS_IS_OQUOTA_ON(mp))
 564                         ASSERT(ip->i_gdquot);
 565         }
 566         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 567 #endif
 568         return error;
 569 }
 570
 571 int
 572 xfs_qm_dqattach(
 573         struct xfs_inode        *ip,
 574         uint                    flags)
 575 {
 576         int                     error;
 577
 578         xfs_ilock(ip, XFS_ILOCK_EXCL);
 579         error = xfs_qm_dqattach_locked(ip, flags);
 580         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 581
 582         return error;
 583 }
 584
 585 /*
 586  * Release dquots (and their references) if any.
 587  * The inode should be locked EXCL except when this's called by
 588  * xfs_ireclaim.
 589  */
 590 void
 591 xfs_qm_dqdetach(
 592         xfs_inode_t     *ip)
 593 {
 594         if (!(ip->i_udquot || ip->i_gdquot))
 595                 return;
 596
 597         trace_xfs_dquot_dqdetach(ip);
 598
 599         ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
 600         ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
 601         if (ip->i_udquot) {
 602                 xfs_qm_dqrele(ip->i_udquot);
 603                 ip->i_udquot = NULL;
 604         }
 605         if (ip->i_gdquot) {
 606                 xfs_qm_dqrele(ip->i_gdquot);
 607                 ip->i_gdquot = NULL;
 608         }
 609 }
 610
 611 /*
 612  * This initializes all the quota information that's kept in the
 613  * mount structure
 614  */
 615 STATIC int
 616 xfs_qm_init_quotainfo(
 617         xfs_mount_t     *mp)
 618 {
 619         xfs_quotainfo_t *qinf;
 620         int             error;
 621         xfs_dquot_t     *dqp;
 622
 623         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 624
 625         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 626
 627         /*
 628          * See if quotainodes are setup, and if not, allocate them,
 629          * and change the superblock accordingly.
 630          */
 631         if ((error = xfs_qm_init_quotainos(mp))) {
 632                 kmem_free(qinf);
 633                 mp->m_quotainfo = NULL;
 634                 return error;
 635         }
 636
 637         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 638         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 639         mutex_init(&qinf->qi_tree_lock);
 640
 641         INIT_LIST_HEAD(&qinf->qi_lru_list);
 642         qinf->qi_lru_count = 0;
 643         mutex_init(&qinf->qi_lru_lock);
 644
 645         /* mutex used to serialize quotaoffs */
 646         mutex_init(&qinf->qi_quotaofflock);
 647
 648         /* Precalc some constants */
 649         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 650         ASSERT(qinf->qi_dqchunklen);
 651         qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
 652         do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
 653
 654         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 655
 656         /*
 657          * We try to get the limits from the superuser's limits fields.
 658          * This is quite hacky, but it is standard quota practice.
 659          *
 660          * We look at the USR dquot with id == 0 first, but if user quotas
 661          * are not enabled we goto the GRP dquot with id == 0.
 662          * We don't really care to keep separate default limits for user
 663          * and group quotas, at least not at this point.
 664          *
 665          * Since we may not have done a quotacheck by this point, just read
 666          * the dquot without attaching it to any hashtables or lists.
 667          */
 668         error = xfs_qm_dqread(mp, 0,
 669                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 670                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 671                           XFS_DQ_PROJ),
 672                         XFS_QMOPT_DOWARN, &dqp);
 673         if (!error) {
 674                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 675
 676                 /*
 677                  * The warnings and timers set the grace period given to
 678                  * a user or group before he or she can not perform any
 679                  * more writing. If it is zero, a default is used.
 680                  */
 681                 qinf->qi_btimelimit = ddqp->d_btimer ?
 682                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 683                 qinf->qi_itimelimit = ddqp->d_itimer ?
 684                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 685                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 686                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 687                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 688                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 689                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 690                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 691                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 692                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 693                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 694                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 695                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 696                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 697                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 698                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 699
 700                 xfs_qm_dqdestroy(dqp);
 701         } else {
 702                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 703                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 704                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 705                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 706                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 707                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 708         }
 709
 710         qinf->qi_shrinker.shrink = xfs_qm_shake;
 711         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 712         register_shrinker(&qinf->qi_shrinker);
 713         return 0;
 714 }
 715
 716
 717 /*
 718  * Gets called when unmounting a filesystem or when all quotas get
 719  * turned off.
 720  * This purges the quota inodes, destroys locks and frees itself.
 721  */
 722 void
 723 xfs_qm_destroy_quotainfo(
 724         xfs_mount_t     *mp)
 725 {
 726         xfs_quotainfo_t *qi;
 727
 728         qi = mp->m_quotainfo;
 729         ASSERT(qi != NULL);
 730
 731         unregister_shrinker(&qi->qi_shrinker);
 732
 733         if (qi->qi_uquotaip) {
 734                 IRELE(qi->qi_uquotaip);
 735                 qi->qi_uquotaip = NULL; /* paranoia */
 736         }
 737         if (qi->qi_gquotaip) {
 738                 IRELE(qi->qi_gquotaip);
 739                 qi->qi_gquotaip = NULL;
 740         }
 741         mutex_destroy(&qi->qi_quotaofflock);
 742         kmem_free(qi);
 743         mp->m_quotainfo = NULL;
 744 }
 745
 746 /*
 747  * Create an inode and return with a reference already taken, but unlocked
 748  * This is how we create quota inodes
 749  */
 750 STATIC int
 751 xfs_qm_qino_alloc(
 752         xfs_mount_t     *mp,
 753         xfs_inode_t     **ip,
 754         __int64_t       sbfields,
 755         uint            flags)
 756 {
 757         xfs_trans_t     *tp;
 758         int             error;
 759         int             committed;
 760
 761         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 762         if ((error = xfs_trans_reserve(tp,
 763                                       XFS_QM_QINOCREATE_SPACE_RES(mp),
 764                                       XFS_CREATE_LOG_RES(mp), 0,
 765                                       XFS_TRANS_PERM_LOG_RES,
 766                                       XFS_CREATE_LOG_COUNT))) {
 767                 xfs_trans_cancel(tp, 0);
 768                 return error;
 769         }
 770
 771         error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 772         if (error) {
 773                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 774                                  XFS_TRANS_ABORT);
 775                 return error;
 776         }
 777
 778         /*
 779          * Make the changes in the superblock, and log those too.
 780          * sbfields arg may contain fields other than *QUOTINO;
 781          * VERSIONNUM for example.
 782          */
 783         spin_lock(&mp->m_sb_lock);
 784         if (flags & XFS_QMOPT_SBVERSION) {
 785                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 786                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 787                                    XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 788                        (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 789                         XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 790
 791                 xfs_sb_version_addquota(&mp->m_sb);
 792                 mp->m_sb.sb_uquotino = NULLFSINO;
 793                 mp->m_sb.sb_gquotino = NULLFSINO;
 794
 795                 /* qflags will get updated _after_ quotacheck */
 796                 mp->m_sb.sb_qflags = 0;
 797         }
 798         if (flags & XFS_QMOPT_UQUOTA)
 799                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 800         else
 801                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 802         spin_unlock(&mp->m_sb_lock);
 803         xfs_mod_sb(tp, sbfields);
 804
 805         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 806                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 807                 return error;
 808         }
 809         return 0;
 810 }
 811
 812
 813 STATIC void
 814 xfs_qm_reset_dqcounts(
 815         xfs_mount_t     *mp,
 816         xfs_buf_t       *bp,
 817         xfs_dqid_t      id,
 818         uint            type)
 819 {
 820         xfs_disk_dquot_t        *ddq;
 821         int                     j;
 822
 823         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 824
 825         /*
 826          * Reset all counters and timers. They'll be
 827          * started afresh by xfs_qm_quotacheck.
 828          */
 829 #ifdef DEBUG
 830         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 831         do_div(j, sizeof(xfs_dqblk_t));
 832         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 833 #endif
 834         ddq = bp->b_addr;
 835         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 836                 /*
 837                  * Do a sanity check, and if needed, repair the dqblk. Don't
 838                  * output any warnings because it's perfectly possible to
 839                  * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 840                  */
 841                 (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 842                                       "xfs_quotacheck");
 843                 ddq->d_bcount = 0;
 844                 ddq->d_icount = 0;
 845                 ddq->d_rtbcount = 0;
 846                 ddq->d_btimer = 0;
 847                 ddq->d_itimer = 0;
 848                 ddq->d_rtbtimer = 0;
 849                 ddq->d_bwarns = 0;
 850                 ddq->d_iwarns = 0;
 851                 ddq->d_rtbwarns = 0;
 852                 ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
 853         }
 854 }
 855
 856 STATIC int
 857 xfs_qm_dqiter_bufs(
 858         xfs_mount_t     *mp,
 859         xfs_dqid_t      firstid,
 860         xfs_fsblock_t   bno,
 861         xfs_filblks_t   blkcnt,
 862         uint            flags)
 863 {
 864         xfs_buf_t       *bp;
 865         int             error;
 866         int             type;
 867
 868         ASSERT(blkcnt > 0);
 869         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 870                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 871         error = 0;
 872
 873         /*
 874          * Blkcnt arg can be a very big number, and might even be
 875          * larger than the log itself. So, we have to break it up into
 876          * manageable-sized transactions.
 877          * Note that we don't start a permanent transaction here; we might
 878          * not be able to get a log reservation for the whole thing up front,
 879          * and we don't really care to either, because we just discard
 880          * everything if we were to crash in the middle of this loop.
 881          */
 882         while (blkcnt--) {
 883                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 884                               XFS_FSB_TO_DADDR(mp, bno),
 885                               mp->m_quotainfo->qi_dqchunklen, 0, &bp);
 886                 if (error)
 887                         break;
 888
 889                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 890                 xfs_buf_delwri_queue(bp);
 891                 xfs_buf_relse(bp);
 892                 /*
 893                  * goto the next block.
 894                  */
 895                 bno++;
 896                 firstid += mp->m_quotainfo->qi_dqperchunk;
 897         }
 898         return error;
 899 }
 900
 901 /*
 902  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 903  * caller supplied function for every chunk of dquots that we find.
 904  */
 905 STATIC int
 906 xfs_qm_dqiterate(
 907         xfs_mount_t     *mp,
 908         xfs_inode_t     *qip,
 909         uint            flags)
 910 {
 911         xfs_bmbt_irec_t         *map;
 912         int                     i, nmaps;       /* number of map entries */
 913         int                     error;          /* return value */
 914         xfs_fileoff_t           lblkno;
 915         xfs_filblks_t           maxlblkcnt;
 916         xfs_dqid_t              firstid;
 917         xfs_fsblock_t           rablkno;
 918         xfs_filblks_t           rablkcnt;
 919
 920         error = 0;
 921         /*
 922          * This looks racy, but we can't keep an inode lock across a
 923          * trans_reserve. But, this gets called during quotacheck, and that
 924          * happens only at mount time which is single threaded.
 925          */
 926         if (qip->i_d.di_nblocks == 0)
 927                 return 0;
 928
 929         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 930
 931         lblkno = 0;
 932         maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
 933         do {
 934                 nmaps = XFS_DQITER_MAP_SIZE;
 935                 /*
 936                  * We aren't changing the inode itself. Just changing
 937                  * some of its data. No new blocks are added here, and
 938                  * the inode is never added to the transaction.
 939                  */
 940                 xfs_ilock(qip, XFS_ILOCK_SHARED);
 941                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 942                                        map, &nmaps, 0);
 943                 xfs_iunlock(qip, XFS_ILOCK_SHARED);
 944                 if (error)
 945                         break;
 946
 947                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 948                 for (i = 0; i < nmaps; i++) {
 949                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 950                         ASSERT(map[i].br_blockcount);
 951
 952
 953                         lblkno += map[i].br_blockcount;
 954
 955                         if (map[i].br_startblock == HOLESTARTBLOCK)
 956                                 continue;
 957
 958                         firstid = (xfs_dqid_t) map[i].br_startoff *
 959                                 mp->m_quotainfo->qi_dqperchunk;
 960                         /*
 961                          * Do a read-ahead on the next extent.
 962                          */
 963                         if ((i+1 < nmaps) &&
 964                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 965                                 rablkcnt =  map[i+1].br_blockcount;
 966                                 rablkno = map[i+1].br_startblock;
 967                                 while (rablkcnt--) {
 968                                         xfs_buf_readahead(mp->m_ddev_targp,
 969                                                XFS_FSB_TO_DADDR(mp, rablkno),
 970                                                mp->m_quotainfo->qi_dqchunklen);
 971                                         rablkno++;
 972                                 }
 973                         }
 974                         /*
 975                          * Iterate thru all the blks in the extent and
 976                          * reset the counters of all the dquots inside them.
 977                          */
 978                         if ((error = xfs_qm_dqiter_bufs(mp,
 979                                                        firstid,
 980                                                        map[i].br_startblock,
 981                                                        map[i].br_blockcount,
 982                                                        flags))) {
 983                                 break;
 984                         }
 985                 }
 986
 987                 if (error)
 988                         break;
 989         } while (nmaps > 0);
 990
 991         kmem_free(map);
 992
 993         return error;
 994 }
 995
 996 /*
 997  * Called by dqusage_adjust in doing a quotacheck.
 998  *
 999  * Given the inode, and a dquot id this updates both the incore dqout as well
1000  * as the buffer copy. This is so that once the quotacheck is done, we can
1001  * just log all the buffers, as opposed to logging numerous updates to
1002  * individual dquots.
1003  */
1004 STATIC int
1005 xfs_qm_quotacheck_dqadjust(
1006         struct xfs_inode        *ip,
1007         xfs_dqid_t              id,
1008         uint                    type,
1009         xfs_qcnt_t              nblks,
1010         xfs_qcnt_t              rtblks)
1011 {
1012         struct xfs_mount        *mp = ip->i_mount;
1013         struct xfs_dquot        *dqp;
1014         int                     error;
1015
1016         error = xfs_qm_dqget(mp, ip, id, type,
1017                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1018         if (error) {
1019                 /*
1020                  * Shouldn't be able to turn off quotas here.
1021                  */
1022                 ASSERT(error != ESRCH);
1023                 ASSERT(error != ENOENT);
1024                 return error;
1025         }
1026
1027         trace_xfs_dqadjust(dqp);
1028
1029         /*
1030          * Adjust the inode count and the block count to reflect this inode's
1031          * resource usage.
1032          */
1033         be64_add_cpu(&dqp->q_core.d_icount, 1);
1034         dqp->q_res_icount++;
1035         if (nblks) {
1036                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1037                 dqp->q_res_bcount += nblks;
1038         }
1039         if (rtblks) {
1040                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1041                 dqp->q_res_rtbcount += rtblks;
1042         }
1043
1044         /*
1045          * Set default limits, adjust timers (since we changed usages)
1046          *
1047          * There are no timers for the default values set in the root dquot.
1048          */
1049         if (dqp->q_core.d_id) {
1050                 xfs_qm_adjust_dqlimits(mp, &dqp->q_core);
1051                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1052         }
1053
1054         dqp->dq_flags |= XFS_DQ_DIRTY;
1055         xfs_qm_dqput(dqp);
1056         return 0;
1057 }
1058
1059 STATIC int
1060 xfs_qm_get_rtblks(
1061         xfs_inode_t     *ip,
1062         xfs_qcnt_t      *O_rtblks)
1063 {
1064         xfs_filblks_t   rtblks;                 /* total rt blks */
1065         xfs_extnum_t    idx;                    /* extent record index */
1066         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1067         xfs_extnum_t    nextents;               /* number of extent entries */
1068         int             error;
1069
1070         ASSERT(XFS_IS_REALTIME_INODE(ip));
1071         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1072         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1073                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1074                         return error;
1075         }
1076         rtblks = 0;
1077         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1078         for (idx = 0; idx < nextents; idx++)
1079                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1080         *O_rtblks = (xfs_qcnt_t)rtblks;
1081         return 0;
1082 }
1083
1084 /*
1085  * callback routine supplied to bulkstat(). Given an inumber, find its
1086  * dquots and update them to account for resources taken by that inode.
1087  */
1088 /* ARGSUSED */
1089 STATIC int
1090 xfs_qm_dqusage_adjust(
1091         xfs_mount_t     *mp,            /* mount point for filesystem */
1092         xfs_ino_t       ino,            /* inode number to get data for */
1093         void            __user *buffer, /* not used */
1094         int             ubsize,         /* not used */
1095         int             *ubused,        /* not used */
1096         int             *res)           /* result code value */
1097 {
1098         xfs_inode_t     *ip;
1099         xfs_qcnt_t      nblks, rtblks = 0;
1100         int             error;
1101
1102         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1103
1104         /*
1105          * rootino must have its resources accounted for, not so with the quota
1106          * inodes.
1107          */
1108         if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1109                 *res = BULKSTAT_RV_NOTHING;
1110                 return XFS_ERROR(EINVAL);
1111         }
1112
1113         /*
1114          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1115          * interface expects the inode to be exclusively locked because that's
1116          * the case in all other instances. It's OK that we do this because
1117          * quotacheck is done only at mount time.
1118          */
1119         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1120         if (error) {
1121                 *res = BULKSTAT_RV_NOTHING;
1122                 return error;
1123         }
1124
1125         ASSERT(ip->i_delayed_blks == 0);
1126
1127         if (XFS_IS_REALTIME_INODE(ip)) {
1128                 /*
1129                  * Walk thru the extent list and count the realtime blocks.
1130                  */
1131                 error = xfs_qm_get_rtblks(ip, &rtblks);
1132                 if (error)
1133                         goto error0;
1134         }
1135
1136         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1137
1138         /*
1139          * Add the (disk blocks and inode) resources occupied by this
1140          * inode to its dquots. We do this adjustment in the incore dquot,
1141          * and also copy the changes to its buffer.
1142          * We don't care about putting these changes in a transaction
1143          * envelope because if we crash in the middle of a 'quotacheck'
1144          * we have to start from the beginning anyway.
1145          * Once we're done, we'll log all the dquot bufs.
1146          *
1147          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1148          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1149          */
1150         if (XFS_IS_UQUOTA_ON(mp)) {
1151                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1152                                                    XFS_DQ_USER, nblks, rtblks);
1153                 if (error)
1154                         goto error0;
1155         }
1156
1157         if (XFS_IS_GQUOTA_ON(mp)) {
1158                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1159                                                    XFS_DQ_GROUP, nblks, rtblks);
1160                 if (error)
1161                         goto error0;
1162         }
1163
1164         if (XFS_IS_PQUOTA_ON(mp)) {
1165                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1166                                                    XFS_DQ_PROJ, nblks, rtblks);
1167                 if (error)
1168                         goto error0;
1169         }
1170
1171         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1172         IRELE(ip);
1173         *res = BULKSTAT_RV_DIDONE;
1174         return 0;
1175
1176 error0:
1177         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1178         IRELE(ip);
1179         *res = BULKSTAT_RV_GIVEUP;
1180         return error;
1181 }
1182
1183 STATIC int
1184 xfs_qm_flush_one(
1185         struct xfs_dquot        *dqp)
1186 {
1187         int                     error = 0;
1188
1189         xfs_dqlock(dqp);
1190         if (dqp->dq_flags & XFS_DQ_FREEING)
1191                 goto out_unlock;
1192         if (!XFS_DQ_IS_DIRTY(dqp))
1193                 goto out_unlock;
1194
1195         if (!xfs_dqflock_nowait(dqp))
1196                 xfs_dqflock_pushbuf_wait(dqp);
1197
1198         error = xfs_qm_dqflush(dqp, 0);
1199
1200 out_unlock:
1201         xfs_dqunlock(dqp);
1202         return error;
1203 }
1204
1205 /*
1206  * Walk thru all the filesystem inodes and construct a consistent view
1207  * of the disk quota world. If the quotacheck fails, disable quotas.
1208  */
1209 int
1210 xfs_qm_quotacheck(
1211         xfs_mount_t     *mp)
1212 {
1213         int             done, count, error, error2;
1214         xfs_ino_t       lastino;
1215         size_t          structsz;
1216         xfs_inode_t     *uip, *gip;
1217         uint            flags;
1218
1219         count = INT_MAX;
1220         structsz = 1;
1221         lastino = 0;
1222         flags = 0;
1223
1224         ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1225         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1226
1227         xfs_notice(mp, "Quotacheck needed: Please wait.");
1228
1229         /*
1230          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1231          * their counters to zero. We need a clean slate.
1232          * We don't log our changes till later.
1233          */
1234         uip = mp->m_quotainfo->qi_uquotaip;
1235         if (uip) {
1236                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA);
1237                 if (error)
1238                         goto error_return;
1239                 flags |= XFS_UQUOTA_CHKD;
1240         }
1241
1242         gip = mp->m_quotainfo->qi_gquotaip;
1243         if (gip) {
1244                 error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1245                                         XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1246                 if (error)
1247                         goto error_return;
1248                 flags |= XFS_OQUOTA_CHKD;
1249         }
1250
1251         do {
1252                 /*
1253                  * Iterate thru all the inodes in the file system,
1254                  * adjusting the corresponding dquot counters in core.
1255                  */
1256                 error = xfs_bulkstat(mp, &lastino, &count,
1257                                      xfs_qm_dqusage_adjust,
1258                                      structsz, NULL, &done);
1259                 if (error)
1260                         break;
1261
1262         } while (!done);
1263
1264         /*
1265          * We've made all the changes that we need to make incore.  Flush them
1266          * down to disk buffers if everything was updated successfully.
1267          */
1268         if (XFS_IS_UQUOTA_ON(mp))
1269                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one);
1270         if (XFS_IS_GQUOTA_ON(mp)) {
1271                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one);
1272                 if (!error)
1273                         error = error2;
1274         }
1275         if (XFS_IS_PQUOTA_ON(mp)) {
1276                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one);
1277                 if (!error)
1278                         error = error2;
1279         }
1280
1281         /*
1282          * We can get this error if we couldn't do a dquot allocation inside
1283          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1284          * dirty dquots that might be cached, we just want to get rid of them
1285          * and turn quotaoff. The dquots won't be attached to any of the inodes
1286          * at this point (because we intentionally didn't in dqget_noattach).
1287          */
1288         if (error) {
1289                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1290                 goto error_return;
1291         }
1292
1293         /*
1294          * We didn't log anything, because if we crashed, we'll have to
1295          * start the quotacheck from scratch anyway. However, we must make
1296          * sure that our dquot changes are secure before we put the
1297          * quotacheck'd stamp on the superblock. So, here we do a synchronous
1298          * flush.
1299          */
1300         xfs_flush_buftarg(mp->m_ddev_targp, 1);
1301
1302         /*
1303          * If one type of quotas is off, then it will lose its
1304          * quotachecked status, since we won't be doing accounting for
1305          * that type anymore.
1306          */
1307         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1308         mp->m_qflags |= flags;
1309
1310  error_return:
1311         if (error) {
1312                 xfs_warn(mp,
1313         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1314                         error);
1315                 /*
1316                  * We must turn off quotas.
1317                  */
1318                 ASSERT(mp->m_quotainfo != NULL);
1319                 xfs_qm_destroy_quotainfo(mp);
1320                 if (xfs_mount_reset_sbqflags(mp)) {
1321                         xfs_warn(mp,
1322                                 "Quotacheck: Failed to reset quota flags.");
1323                 }
1324         } else
1325                 xfs_notice(mp, "Quotacheck: Done.");
1326         return (error);
1327 }
1328
1329 /*
1330  * This is called after the superblock has been read in and we're ready to
1331  * iget the quota inodes.
1332  */
1333 STATIC int
1334 xfs_qm_init_quotainos(
1335         xfs_mount_t     *mp)
1336 {
1337         xfs_inode_t     *uip, *gip;
1338         int             error;
1339         __int64_t       sbflags;
1340         uint            flags;
1341
1342         ASSERT(mp->m_quotainfo);
1343         uip = gip = NULL;
1344         sbflags = 0;
1345         flags = 0;
1346
1347         /*
1348          * Get the uquota and gquota inodes
1349          */
1350         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1351                 if (XFS_IS_UQUOTA_ON(mp) &&
1352                     mp->m_sb.sb_uquotino != NULLFSINO) {
1353                         ASSERT(mp->m_sb.sb_uquotino > 0);
1354                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1355                                              0, 0, &uip)))
1356                                 return XFS_ERROR(error);
1357                 }
1358                 if (XFS_IS_OQUOTA_ON(mp) &&
1359                     mp->m_sb.sb_gquotino != NULLFSINO) {
1360                         ASSERT(mp->m_sb.sb_gquotino > 0);
1361                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1362                                              0, 0, &gip))) {
1363                                 if (uip)
1364                                         IRELE(uip);
1365                                 return XFS_ERROR(error);
1366                         }
1367                 }
1368         } else {
1369                 flags |= XFS_QMOPT_SBVERSION;
1370                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1371                             XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1372         }
1373
1374         /*
1375          * Create the two inodes, if they don't exist already. The changes
1376          * made above will get added to a transaction and logged in one of
1377          * the qino_alloc calls below.  If the device is readonly,
1378          * temporarily switch to read-write to do this.
1379          */
1380         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1381                 if ((error = xfs_qm_qino_alloc(mp, &uip,
1382                                               sbflags | XFS_SB_UQUOTINO,
1383                                               flags | XFS_QMOPT_UQUOTA)))
1384                         return XFS_ERROR(error);
1385
1386                 flags &= ~XFS_QMOPT_SBVERSION;
1387         }
1388         if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1389                 flags |= (XFS_IS_GQUOTA_ON(mp) ?
1390                                 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1391                 error = xfs_qm_qino_alloc(mp, &gip,
1392                                           sbflags | XFS_SB_GQUOTINO, flags);
1393                 if (error) {
1394                         if (uip)
1395                                 IRELE(uip);
1396
1397                         return XFS_ERROR(error);
1398                 }
1399         }
1400
1401         mp->m_quotainfo->qi_uquotaip = uip;
1402         mp->m_quotainfo->qi_gquotaip = gip;
1403
1404         return 0;
1405 }
1406
1407 STATIC void
1408 xfs_qm_dqfree_one(
1409         struct xfs_dquot        *dqp)
1410 {
1411         struct xfs_mount        *mp = dqp->q_mount;
1412         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1413
1414         mutex_lock(&qi->qi_tree_lock);
1415         radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
1416                           be32_to_cpu(dqp->q_core.d_id));
1417
1418         qi->qi_dquots--;
1419         mutex_unlock(&qi->qi_tree_lock);
1420
1421         xfs_qm_dqdestroy(dqp);
1422 }
1423
1424 STATIC void
1425 xfs_qm_dqreclaim_one(
1426         struct xfs_dquot        *dqp,
1427         struct list_head        *dispose_list)
1428 {
1429         struct xfs_mount        *mp = dqp->q_mount;
1430         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1431         int                     error;
1432
1433         if (!xfs_dqlock_nowait(dqp))
1434                 goto out_busy;
1435
1436         /*
1437          * This dquot has acquired a reference in the meantime remove it from
1438          * the freelist and try again.
1439          */
1440         if (dqp->q_nrefs) {
1441                 xfs_dqunlock(dqp);
1442
1443                 trace_xfs_dqreclaim_want(dqp);
1444                 XFS_STATS_INC(xs_qm_dqwants);
1445
1446                 list_del_init(&dqp->q_lru);
1447                 qi->qi_lru_count--;
1448                 XFS_STATS_DEC(xs_qm_dquot_unused);
1449                 return;
1450         }
1451
1452         /*
1453          * Try to grab the flush lock. If this dquot is in the process of
1454          * getting flushed to disk, we don't want to reclaim it.
1455          */
1456         if (!xfs_dqflock_nowait(dqp))
1457                 goto out_busy;
1458
1459         /*
1460          * We have the flush lock so we know that this is not in the
1461          * process of being flushed. So, if this is dirty, flush it
1462          * DELWRI so that we don't get a freelist infested with
1463          * dirty dquots.
1464          */
1465         if (XFS_DQ_IS_DIRTY(dqp)) {
1466                 trace_xfs_dqreclaim_dirty(dqp);
1467
1468                 /*
1469                  * We flush it delayed write, so don't bother releasing the
1470                  * freelist lock.
1471                  */
1472                 error = xfs_qm_dqflush(dqp, 0);
1473                 if (error) {
1474                         xfs_warn(mp, "%s: dquot %p flush failed",
1475                                  __func__, dqp);
1476                 }
1477
1478                 /*
1479                  * Give the dquot another try on the freelist, as the
1480                  * flushing will take some time.
1481                  */
1482                 goto out_busy;
1483         }
1484         xfs_dqfunlock(dqp);
1485
1486         /*
1487          * Prevent lookups now that we are past the point of no return.
1488          */
1489         dqp->dq_flags |= XFS_DQ_FREEING;
1490         xfs_dqunlock(dqp);
1491
1492         ASSERT(dqp->q_nrefs == 0);
1493         list_move_tail(&dqp->q_lru, dispose_list);
1494         qi->qi_lru_count--;
1495         XFS_STATS_DEC(xs_qm_dquot_unused);
1496
1497         trace_xfs_dqreclaim_done(dqp);
1498         XFS_STATS_INC(xs_qm_dqreclaims);
1499         return;
1500
1501 out_busy:
1502         xfs_dqunlock(dqp);
1503
1504         /*
1505          * Move the dquot to the tail of the list so that we don't spin on it.
1506          */
1507         list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1508
1509         trace_xfs_dqreclaim_busy(dqp);
1510         XFS_STATS_INC(xs_qm_dqreclaim_misses);
1511 }
1512
1513 STATIC int
1514 xfs_qm_shake(
1515         struct shrinker         *shrink,
1516         struct shrink_control   *sc)
1517 {
1518         struct xfs_quotainfo    *qi =
1519                 container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1520         int                     nr_to_scan = sc->nr_to_scan;
1521         LIST_HEAD               (dispose_list);
1522         struct xfs_dquot        *dqp;
1523
1524         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1525                 return 0;
1526         if (!nr_to_scan)
1527                 goto out;
1528
1529         mutex_lock(&qi->qi_lru_lock);
1530         while (!list_empty(&qi->qi_lru_list)) {
1531                 if (nr_to_scan-- <= 0)
1532                         break;
1533                 dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1534                                        q_lru);
1535                 xfs_qm_dqreclaim_one(dqp, &dispose_list);
1536         }
1537         mutex_unlock(&qi->qi_lru_lock);
1538
1539         while (!list_empty(&dispose_list)) {
1540                 dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1541                 list_del_init(&dqp->q_lru);
1542                 xfs_qm_dqfree_one(dqp);
1543         }
1544 out:
1545         return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1546 }
1547
1548 /*
1549  * Start a transaction and write the incore superblock changes to
1550  * disk. flags parameter indicates which fields have changed.
1551  */
1552 int
1553 xfs_qm_write_sb_changes(
1554         xfs_mount_t     *mp,
1555         __int64_t       flags)
1556 {
1557         xfs_trans_t     *tp;
1558         int             error;
1559
1560         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1561         if ((error = xfs_trans_reserve(tp, 0,
1562                                       mp->m_sb.sb_sectsize + 128, 0,
1563                                       0,
1564                                       XFS_DEFAULT_LOG_COUNT))) {
1565                 xfs_trans_cancel(tp, 0);
1566                 return error;
1567         }
1568
1569         xfs_mod_sb(tp, flags);
1570         error = xfs_trans_commit(tp, 0);
1571
1572         return error;
1573 }
1574
1575
1576 /* --------------- utility functions for vnodeops ---------------- */
1577
1578
1579 /*
1580  * Given an inode, a uid, gid and prid make sure that we have
1581  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1582  * quotas by creating this file.
1583  * This also attaches dquot(s) to the given inode after locking it,
1584  * and returns the dquots corresponding to the uid and/or gid.
1585  *
1586  * in   : inode (unlocked)
1587  * out  : udquot, gdquot with references taken and unlocked
1588  */
1589 int
1590 xfs_qm_vop_dqalloc(
1591         struct xfs_inode        *ip,
1592         uid_t                   uid,
1593         gid_t                   gid,
1594         prid_t                  prid,
1595         uint                    flags,
1596         struct xfs_dquot        **O_udqpp,
1597         struct xfs_dquot        **O_gdqpp)
1598 {
1599         struct xfs_mount        *mp = ip->i_mount;
1600         struct xfs_dquot        *uq, *gq;
1601         int                     error;
1602         uint                    lockflags;
1603
1604         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1605                 return 0;
1606
1607         lockflags = XFS_ILOCK_EXCL;
1608         xfs_ilock(ip, lockflags);
1609
1610         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1611                 gid = ip->i_d.di_gid;
1612
1613         /*
1614          * Attach the dquot(s) to this inode, doing a dquot allocation
1615          * if necessary. The dquot(s) will not be locked.
1616          */
1617         if (XFS_NOT_DQATTACHED(mp, ip)) {
1618                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1619                 if (error) {
1620                         xfs_iunlock(ip, lockflags);
1621                         return error;
1622                 }
1623         }
1624
1625         uq = gq = NULL;
1626         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1627                 if (ip->i_d.di_uid != uid) {
1628                         /*
1629                          * What we need is the dquot that has this uid, and
1630                          * if we send the inode to dqget, the uid of the inode
1631                          * takes priority over what's sent in the uid argument.
1632                          * We must unlock inode here before calling dqget if
1633                          * we're not sending the inode, because otherwise
1634                          * we'll deadlock by doing trans_reserve while
1635                          * holding ilock.
1636                          */
1637                         xfs_iunlock(ip, lockflags);
1638                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1639                                                  XFS_DQ_USER,
1640                                                  XFS_QMOPT_DQALLOC |
1641                                                  XFS_QMOPT_DOWARN,
1642                                                  &uq))) {
1643                                 ASSERT(error != ENOENT);
1644                                 return error;
1645                         }
1646                         /*
1647                          * Get the ilock in the right order.
1648                          */
1649                         xfs_dqunlock(uq);
1650                         lockflags = XFS_ILOCK_SHARED;
1651                         xfs_ilock(ip, lockflags);
1652                 } else {
1653                         /*
1654                          * Take an extra reference, because we'll return
1655                          * this to caller
1656                          */
1657                         ASSERT(ip->i_udquot);
1658                         uq = xfs_qm_dqhold(ip->i_udquot);
1659                 }
1660         }
1661         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1662                 if (ip->i_d.di_gid != gid) {
1663                         xfs_iunlock(ip, lockflags);
1664                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1665                                                  XFS_DQ_GROUP,
1666                                                  XFS_QMOPT_DQALLOC |
1667                                                  XFS_QMOPT_DOWARN,
1668                                                  &gq))) {
1669                                 if (uq)
1670                                         xfs_qm_dqrele(uq);
1671                                 ASSERT(error != ENOENT);
1672                                 return error;
1673                         }
1674                         xfs_dqunlock(gq);
1675                         lockflags = XFS_ILOCK_SHARED;
1676                         xfs_ilock(ip, lockflags);
1677                 } else {
1678                         ASSERT(ip->i_gdquot);
1679                         gq = xfs_qm_dqhold(ip->i_gdquot);
1680                 }
1681         } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1682                 if (xfs_get_projid(ip) != prid) {
1683                         xfs_iunlock(ip, lockflags);
1684                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1685                                                  XFS_DQ_PROJ,
1686                                                  XFS_QMOPT_DQALLOC |
1687                                                  XFS_QMOPT_DOWARN,
1688                                                  &gq))) {
1689                                 if (uq)
1690                                         xfs_qm_dqrele(uq);
1691                                 ASSERT(error != ENOENT);
1692                                 return (error);
1693                         }
1694                         xfs_dqunlock(gq);
1695                         lockflags = XFS_ILOCK_SHARED;
1696                         xfs_ilock(ip, lockflags);
1697                 } else {
1698                         ASSERT(ip->i_gdquot);
1699                         gq = xfs_qm_dqhold(ip->i_gdquot);
1700                 }
1701         }
1702         if (uq)
1703                 trace_xfs_dquot_dqalloc(ip);
1704
1705         xfs_iunlock(ip, lockflags);
1706         if (O_udqpp)
1707                 *O_udqpp = uq;
1708         else if (uq)
1709                 xfs_qm_dqrele(uq);
1710         if (O_gdqpp)
1711                 *O_gdqpp = gq;
1712         else if (gq)
1713                 xfs_qm_dqrele(gq);
1714         return 0;
1715 }
1716
1717 /*
1718  * Actually transfer ownership, and do dquot modifications.
1719  * These were already reserved.
1720  */
1721 xfs_dquot_t *
1722 xfs_qm_vop_chown(
1723         xfs_trans_t     *tp,
1724         xfs_inode_t     *ip,
1725         xfs_dquot_t     **IO_olddq,
1726         xfs_dquot_t     *newdq)
1727 {
1728         xfs_dquot_t     *prevdq;
1729         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1730                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1731
1732
1733         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1734         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1735
1736         /* old dquot */
1737         prevdq = *IO_olddq;
1738         ASSERT(prevdq);
1739         ASSERT(prevdq != newdq);
1740
1741         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1742         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1743
1744         /* the sparkling new dquot */
1745         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1746         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1747
1748         /*
1749          * Take an extra reference, because the inode is going to keep
1750          * this dquot pointer even after the trans_commit.
1751          */
1752         *IO_olddq = xfs_qm_dqhold(newdq);
1753
1754         return prevdq;
1755 }
1756
1757 /*
1758  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1759  */
1760 int
1761 xfs_qm_vop_chown_reserve(
1762         xfs_trans_t     *tp,
1763         xfs_inode_t     *ip,
1764         xfs_dquot_t     *udqp,
1765         xfs_dquot_t     *gdqp,
1766         uint            flags)
1767 {
1768         xfs_mount_t     *mp = ip->i_mount;
1769         uint            delblks, blkflags, prjflags = 0;
1770         xfs_dquot_t     *unresudq, *unresgdq, *delblksudq, *delblksgdq;
1771         int             error;
1772
1773
1774         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1775         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1776
1777         delblks = ip->i_delayed_blks;
1778         delblksudq = delblksgdq = unresudq = unresgdq = NULL;
1779         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1780                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1781
1782         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1783             ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1784                 delblksudq = udqp;
1785                 /*
1786                  * If there are delayed allocation blocks, then we have to
1787                  * unreserve those from the old dquot, and add them to the
1788                  * new dquot.
1789                  */
1790                 if (delblks) {
1791                         ASSERT(ip->i_udquot);
1792                         unresudq = ip->i_udquot;
1793                 }
1794         }
1795         if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
1796                 if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
1797                      xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
1798                         prjflags = XFS_QMOPT_ENOSPC;
1799
1800                 if (prjflags ||
1801                     (XFS_IS_GQUOTA_ON(ip->i_mount) &&
1802                      ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
1803                         delblksgdq = gdqp;
1804                         if (delblks) {
1805                                 ASSERT(ip->i_gdquot);
1806                                 unresgdq = ip->i_gdquot;
1807                         }
1808                 }
1809         }
1810
1811         if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1812                                 delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
1813                                 flags | blkflags | prjflags)))
1814                 return (error);
1815
1816         /*
1817          * Do the delayed blks reservations/unreservations now. Since, these
1818          * are done without the help of a transaction, if a reservation fails
1819          * its previous reservations won't be automatically undone by trans
1820          * code. So, we have to do it manually here.
1821          */
1822         if (delblks) {
1823                 /*
1824                  * Do the reservations first. Unreservation can't fail.
1825                  */
1826                 ASSERT(delblksudq || delblksgdq);
1827                 ASSERT(unresudq || unresgdq);
1828                 if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1829                                 delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
1830                                 flags | blkflags | prjflags)))
1831                         return (error);
1832                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1833                                 unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
1834                                 blkflags);
1835         }
1836
1837         return (0);
1838 }
1839
1840 int
1841 xfs_qm_vop_rename_dqattach(
1842         struct xfs_inode        **i_tab)
1843 {
1844         struct xfs_mount        *mp = i_tab[0]->i_mount;
1845         int                     i;
1846
1847         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1848                 return 0;
1849
1850         for (i = 0; (i < 4 && i_tab[i]); i++) {
1851                 struct xfs_inode        *ip = i_tab[i];
1852                 int                     error;
1853
1854                 /*
1855                  * Watch out for duplicate entries in the table.
1856                  */
1857                 if (i == 0 || ip != i_tab[i-1]) {
1858                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1859                                 error = xfs_qm_dqattach(ip, 0);
1860                                 if (error)
1861                                         return error;
1862                         }
1863                 }
1864         }
1865         return 0;
1866 }
1867
1868 void
1869 xfs_qm_vop_create_dqattach(
1870         struct xfs_trans        *tp,
1871         struct xfs_inode        *ip,
1872         struct xfs_dquot        *udqp,
1873         struct xfs_dquot        *gdqp)
1874 {
1875         struct xfs_mount        *mp = tp->t_mountp;
1876
1877         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1878                 return;
1879
1880         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1881         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1882
1883         if (udqp) {
1884                 ASSERT(ip->i_udquot == NULL);
1885                 ASSERT(XFS_IS_UQUOTA_ON(mp));
1886                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1887
1888                 ip->i_udquot = xfs_qm_dqhold(udqp);
1889                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1890         }
1891         if (gdqp) {
1892                 ASSERT(ip->i_gdquot == NULL);
1893                 ASSERT(XFS_IS_OQUOTA_ON(mp));
1894                 ASSERT((XFS_IS_GQUOTA_ON(mp) ?
1895                         ip->i_d.di_gid : xfs_get_projid(ip)) ==
1896                                 be32_to_cpu(gdqp->q_core.d_id));
1897
1898                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1899                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1900         }
1901 }
1902