fs/xfs/xfs_qm.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_trans.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_alloc.h"
  26 #include "xfs_quota.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_ialloc_btree.h"
  30 #include "xfs_dinode.h"
  31 #include "xfs_inode.h"
  32 #include "xfs_ialloc.h"
  33 #include "xfs_itable.h"
  34 #include "xfs_rtalloc.h"
  35 #include "xfs_error.h"
  36 #include "xfs_bmap.h"
  37 #include "xfs_attr.h"
  38 #include "xfs_buf_item.h"
  39 #include "xfs_trans_space.h"
  40 #include "xfs_utils.h"
  41 #include "xfs_qm.h"
  42 #include "xfs_trace.h"
  43 #include "xfs_icache.h"
  44 #include "xfs_cksum.h"
  45
  46 /*
  47  * The global quota manager. There is only one of these for the entire
  48  * system, _not_ one per file system. XQM keeps track of the overall
  49  * quota functionality, including maintaining the freelist and hash
  50  * tables of dquots.
  51  */
  52 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  53 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  54 STATIC int      xfs_qm_shake(struct shrinker *, struct shrink_control *);
  55
  56 /*
  57  * We use the batch lookup interface to iterate over the dquots as it
  58  * currently is the only interface into the radix tree code that allows
  59  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  60  * operations is fine as all callers are used either during mount/umount
  61  * or quotaoff.
  62  */
  63 #define XFS_DQ_LOOKUP_BATCH     32
  64
  65 STATIC int
  66 xfs_qm_dquot_walk(
  67         struct xfs_mount        *mp,
  68         int                     type,
  69         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  70         void                    *data)
  71 {
  72         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  73         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  74         uint32_t                next_index;
  75         int                     last_error = 0;
  76         int                     skipped;
  77         int                     nr_found;
  78
  79 restart:
  80         skipped = 0;
  81         next_index = 0;
  82         nr_found = 0;
  83
  84         while (1) {
  85                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  86                 int             error = 0;
  87                 int             i;
  88
  89                 mutex_lock(&qi->qi_tree_lock);
  90                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  91                                         next_index, XFS_DQ_LOOKUP_BATCH);
  92                 if (!nr_found) {
  93                         mutex_unlock(&qi->qi_tree_lock);
  94                         break;
  95                 }
  96
  97                 for (i = 0; i < nr_found; i++) {
  98                         struct xfs_dquot *dqp = batch[i];
  99
 100                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
 101
 102                         error = execute(batch[i], data);
 103                         if (error == EAGAIN) {
 104                                 skipped++;
 105                                 continue;
 106                         }
 107                         if (error && last_error != EFSCORRUPTED)
 108                                 last_error = error;
 109                 }
 110
 111                 mutex_unlock(&qi->qi_tree_lock);
 112
 113                 /* bail out if the filesystem is corrupted.  */
 114                 if (last_error == EFSCORRUPTED) {
 115                         skipped = 0;
 116                         break;
 117                 }
 118         }
 119
 120         if (skipped) {
 121                 delay(1);
 122                 goto restart;
 123         }
 124
 125         return last_error;
 126 }
 127
 128
 129 /*
 130  * Purge a dquot from all tracking data structures and free it.
 131  */
 132 STATIC int
 133 xfs_qm_dqpurge(
 134         struct xfs_dquot        *dqp,
 135         void                    *data)
 136 {
 137         struct xfs_mount        *mp = dqp->q_mount;
 138         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 139         struct xfs_dquot        *gdqp = NULL;
 140
 141         xfs_dqlock(dqp);
 142         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 143                 xfs_dqunlock(dqp);
 144                 return EAGAIN;
 145         }
 146
 147         /*
 148          * If this quota has a group hint attached, prepare for releasing it
 149          * now.
 150          */
 151         gdqp = dqp->q_gdquot;
 152         if (gdqp) {
 153                 xfs_dqlock(gdqp);
 154                 dqp->q_gdquot = NULL;
 155         }
 156
 157         dqp->dq_flags |= XFS_DQ_FREEING;
 158
 159         xfs_dqflock(dqp);
 160
 161         /*
 162          * If we are turning this type of quotas off, we don't care
 163          * about the dirty metadata sitting in this dquot. OTOH, if
 164          * we're unmounting, we do care, so we flush it and wait.
 165          */
 166         if (XFS_DQ_IS_DIRTY(dqp)) {
 167                 struct xfs_buf  *bp = NULL;
 168                 int             error;
 169
 170                 /*
 171                  * We don't care about getting disk errors here. We need
 172                  * to purge this dquot anyway, so we go ahead regardless.
 173                  */
 174                 error = xfs_qm_dqflush(dqp, &bp);
 175                 if (error) {
 176                         xfs_warn(mp, "%s: dquot %p flush failed",
 177                                 __func__, dqp);
 178                 } else {
 179                         error = xfs_bwrite(bp);
 180                         xfs_buf_relse(bp);
 181                 }
 182                 xfs_dqflock(dqp);
 183         }
 184
 185         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 186         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 187                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 188
 189         xfs_dqfunlock(dqp);
 190         xfs_dqunlock(dqp);
 191
 192         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 193                           be32_to_cpu(dqp->q_core.d_id));
 194         qi->qi_dquots--;
 195
 196         /*
 197          * We move dquots to the freelist as soon as their reference count
 198          * hits zero, so it really should be on the freelist here.
 199          */
 200         mutex_lock(&qi->qi_lru_lock);
 201         ASSERT(!list_empty(&dqp->q_lru));
 202         list_del_init(&dqp->q_lru);
 203         qi->qi_lru_count--;
 204         XFS_STATS_DEC(xs_qm_dquot_unused);
 205         mutex_unlock(&qi->qi_lru_lock);
 206
 207         xfs_qm_dqdestroy(dqp);
 208
 209         if (gdqp)
 210                 xfs_qm_dqput(gdqp);
 211         return 0;
 212 }
 213
 214 /*
 215  * Purge the dquot cache.
 216  */
 217 void
 218 xfs_qm_dqpurge_all(
 219         struct xfs_mount        *mp,
 220         uint                    flags)
 221 {
 222         if (flags & XFS_QMOPT_UQUOTA)
 223                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 224         if (flags & XFS_QMOPT_GQUOTA)
 225                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 226         if (flags & XFS_QMOPT_PQUOTA)
 227                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 228 }
 229
 230 /*
 231  * Just destroy the quotainfo structure.
 232  */
 233 void
 234 xfs_qm_unmount(
 235         struct xfs_mount        *mp)
 236 {
 237         if (mp->m_quotainfo) {
 238                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 239                 xfs_qm_destroy_quotainfo(mp);
 240         }
 241 }
 242
 243
 244 /*
 245  * This is called from xfs_mountfs to start quotas and initialize all
 246  * necessary data structures like quotainfo.  This is also responsible for
 247  * running a quotacheck as necessary.  We are guaranteed that the superblock
 248  * is consistently read in at this point.
 249  *
 250  * If we fail here, the mount will continue with quota turned off. We don't
 251  * need to inidicate success or failure at all.
 252  */
 253 void
 254 xfs_qm_mount_quotas(
 255         xfs_mount_t     *mp)
 256 {
 257         int             error = 0;
 258         uint            sbf;
 259
 260         /*
 261          * If quotas on realtime volumes is not supported, we disable
 262          * quotas immediately.
 263          */
 264         if (mp->m_sb.sb_rextents) {
 265                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
 266                 mp->m_qflags = 0;
 267                 goto write_changes;
 268         }
 269
 270         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 271
 272         /*
 273          * Allocate the quotainfo structure inside the mount struct, and
 274          * create quotainode(s), and change/rev superblock if necessary.
 275          */
 276         error = xfs_qm_init_quotainfo(mp);
 277         if (error) {
 278                 /*
 279                  * We must turn off quotas.
 280                  */
 281                 ASSERT(mp->m_quotainfo == NULL);
 282                 mp->m_qflags = 0;
 283                 goto write_changes;
 284         }
 285         /*
 286          * If any of the quotas are not consistent, do a quotacheck.
 287          */
 288         if (XFS_QM_NEED_QUOTACHECK(mp)) {
 289                 error = xfs_qm_quotacheck(mp);
 290                 if (error) {
 291                         /* Quotacheck failed and disabled quotas. */
 292                         return;
 293                 }
 294         }
 295         /*
 296          * If one type of quotas is off, then it will lose its
 297          * quotachecked status, since we won't be doing accounting for
 298          * that type anymore.
 299          */
 300         if (!XFS_IS_UQUOTA_ON(mp))
 301                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
 302         if (!(XFS_IS_GQUOTA_ON(mp) || XFS_IS_PQUOTA_ON(mp)))
 303                 mp->m_qflags &= ~XFS_OQUOTA_CHKD;
 304
 305  write_changes:
 306         /*
 307          * We actually don't have to acquire the m_sb_lock at all.
 308          * This can only be called from mount, and that's single threaded. XXX
 309          */
 310         spin_lock(&mp->m_sb_lock);
 311         sbf = mp->m_sb.sb_qflags;
 312         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
 313         spin_unlock(&mp->m_sb_lock);
 314
 315         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
 316                 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
 317                         /*
 318                          * We could only have been turning quotas off.
 319                          * We aren't in very good shape actually because
 320                          * the incore structures are convinced that quotas are
 321                          * off, but the on disk superblock doesn't know that !
 322                          */
 323                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
 324                         xfs_alert(mp, "%s: Superblock update failed!",
 325                                 __func__);
 326                 }
 327         }
 328
 329         if (error) {
 330                 xfs_warn(mp, "Failed to initialize disk quotas.");
 331                 return;
 332         }
 333 }
 334
 335 /*
 336  * Called from the vfsops layer.
 337  */
 338 void
 339 xfs_qm_unmount_quotas(
 340         xfs_mount_t     *mp)
 341 {
 342         /*
 343          * Release the dquots that root inode, et al might be holding,
 344          * before we flush quotas and blow away the quotainfo structure.
 345          */
 346         ASSERT(mp->m_rootip);
 347         xfs_qm_dqdetach(mp->m_rootip);
 348         if (mp->m_rbmip)
 349                 xfs_qm_dqdetach(mp->m_rbmip);
 350         if (mp->m_rsumip)
 351                 xfs_qm_dqdetach(mp->m_rsumip);
 352
 353         /*
 354          * Release the quota inodes.
 355          */
 356         if (mp->m_quotainfo) {
 357                 if (mp->m_quotainfo->qi_uquotaip) {
 358                         IRELE(mp->m_quotainfo->qi_uquotaip);
 359                         mp->m_quotainfo->qi_uquotaip = NULL;
 360                 }
 361                 if (mp->m_quotainfo->qi_gquotaip) {
 362                         IRELE(mp->m_quotainfo->qi_gquotaip);
 363                         mp->m_quotainfo->qi_gquotaip = NULL;
 364                 }
 365         }
 366 }
 367
 368 STATIC int
 369 xfs_qm_dqattach_one(
 370         xfs_inode_t     *ip,
 371         xfs_dqid_t      id,
 372         uint            type,
 373         uint            doalloc,
 374         xfs_dquot_t     *udqhint, /* hint */
 375         xfs_dquot_t     **IO_idqpp)
 376 {
 377         xfs_dquot_t     *dqp;
 378         int             error;
 379
 380         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 381         error = 0;
 382
 383         /*
 384          * See if we already have it in the inode itself. IO_idqpp is
 385          * &i_udquot or &i_gdquot. This made the code look weird, but
 386          * made the logic a lot simpler.
 387          */
 388         dqp = *IO_idqpp;
 389         if (dqp) {
 390                 trace_xfs_dqattach_found(dqp);
 391                 return 0;
 392         }
 393
 394         /*
 395          * udqhint is the i_udquot field in inode, and is non-NULL only
 396          * when the type arg is group/project. Its purpose is to save a
 397          * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
 398          * the user dquot.
 399          */
 400         if (udqhint) {
 401                 ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 402                 xfs_dqlock(udqhint);
 403
 404                 /*
 405                  * No need to take dqlock to look at the id.
 406                  *
 407                  * The ID can't change until it gets reclaimed, and it won't
 408                  * be reclaimed as long as we have a ref from inode and we
 409                  * hold the ilock.
 410                  */
 411                 dqp = udqhint->q_gdquot;
 412                 if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
 413                         ASSERT(*IO_idqpp == NULL);
 414
 415                         *IO_idqpp = xfs_qm_dqhold(dqp);
 416                         xfs_dqunlock(udqhint);
 417                         return 0;
 418                 }
 419
 420                 /*
 421                  * We can't hold a dquot lock when we call the dqget code.
 422                  * We'll deadlock in no time, because of (not conforming to)
 423                  * lock ordering - the inodelock comes before any dquot lock,
 424                  * and we may drop and reacquire the ilock in xfs_qm_dqget().
 425                  */
 426                 xfs_dqunlock(udqhint);
 427         }
 428
 429         /*
 430          * Find the dquot from somewhere. This bumps the
 431          * reference count of dquot and returns it locked.
 432          * This can return ENOENT if dquot didn't exist on
 433          * disk and we didn't ask it to allocate;
 434          * ESRCH if quotas got turned off suddenly.
 435          */
 436         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 437                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 438         if (error)
 439                 return error;
 440
 441         trace_xfs_dqattach_get(dqp);
 442
 443         /*
 444          * dqget may have dropped and re-acquired the ilock, but it guarantees
 445          * that the dquot returned is the one that should go in the inode.
 446          */
 447         *IO_idqpp = dqp;
 448         xfs_dqunlock(dqp);
 449         return 0;
 450 }
 451
 452
 453 /*
 454  * Given a udquot and gdquot, attach a ptr to the group dquot in the
 455  * udquot as a hint for future lookups.
 456  */
 457 STATIC void
 458 xfs_qm_dqattach_grouphint(
 459         xfs_dquot_t     *udq,
 460         xfs_dquot_t     *gdq)
 461 {
 462         xfs_dquot_t     *tmp;
 463
 464         xfs_dqlock(udq);
 465
 466         tmp = udq->q_gdquot;
 467         if (tmp) {
 468                 if (tmp == gdq)
 469                         goto done;
 470
 471                 udq->q_gdquot = NULL;
 472                 xfs_qm_dqrele(tmp);
 473         }
 474
 475         udq->q_gdquot = xfs_qm_dqhold(gdq);
 476 done:
 477         xfs_dqunlock(udq);
 478 }
 479
 480 static bool
 481 xfs_qm_need_dqattach(
 482         struct xfs_inode        *ip)
 483 {
 484         struct xfs_mount        *mp = ip->i_mount;
 485
 486         if (!XFS_IS_QUOTA_RUNNING(mp))
 487                 return false;
 488         if (!XFS_IS_QUOTA_ON(mp))
 489                 return false;
 490         if (!XFS_NOT_DQATTACHED(mp, ip))
 491                 return false;
 492         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 493                 return false;
 494         return true;
 495 }
 496
 497 /*
 498  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 499  * into account.
 500  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 501  * Inode may get unlocked and relocked in here, and the caller must deal with
 502  * the consequences.
 503  */
 504 int
 505 xfs_qm_dqattach_locked(
 506         xfs_inode_t     *ip,
 507         uint            flags)
 508 {
 509         xfs_mount_t     *mp = ip->i_mount;
 510         uint            nquotas = 0;
 511         int             error = 0;
 512
 513         if (!xfs_qm_need_dqattach(ip))
 514                 return 0;
 515
 516         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 517
 518         if (XFS_IS_UQUOTA_ON(mp)) {
 519                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 520                                                 flags & XFS_QMOPT_DQALLOC,
 521                                                 NULL, &ip->i_udquot);
 522                 if (error)
 523                         goto done;
 524                 nquotas++;
 525         }
 526
 527         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 528         if (XFS_IS_OQUOTA_ON(mp)) {
 529                 error = XFS_IS_GQUOTA_ON(mp) ?
 530                         xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 531                                                 flags & XFS_QMOPT_DQALLOC,
 532                                                 ip->i_udquot, &ip->i_gdquot) :
 533                         xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 534                                                 flags & XFS_QMOPT_DQALLOC,
 535                                                 ip->i_udquot, &ip->i_gdquot);
 536                 /*
 537                  * Don't worry about the udquot that we may have
 538                  * attached above. It'll get detached, if not already.
 539                  */
 540                 if (error)
 541                         goto done;
 542                 nquotas++;
 543         }
 544
 545         /*
 546          * Attach this group quota to the user quota as a hint.
 547          * This WON'T, in general, result in a thrash.
 548          */
 549         if (nquotas == 2) {
 550                 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 551                 ASSERT(ip->i_udquot);
 552                 ASSERT(ip->i_gdquot);
 553
 554                 /*
 555                  * We do not have i_udquot locked at this point, but this check
 556                  * is OK since we don't depend on the i_gdquot to be accurate
 557                  * 100% all the time. It is just a hint, and this will
 558                  * succeed in general.
 559                  */
 560                 if (ip->i_udquot->q_gdquot != ip->i_gdquot)
 561                         xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
 562         }
 563
 564  done:
 565 #ifdef DEBUG
 566         if (!error) {
 567                 if (XFS_IS_UQUOTA_ON(mp))
 568                         ASSERT(ip->i_udquot);
 569                 if (XFS_IS_OQUOTA_ON(mp))
 570                         ASSERT(ip->i_gdquot);
 571         }
 572         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 573 #endif
 574         return error;
 575 }
 576
 577 int
 578 xfs_qm_dqattach(
 579         struct xfs_inode        *ip,
 580         uint                    flags)
 581 {
 582         int                     error;
 583
 584         if (!xfs_qm_need_dqattach(ip))
 585                 return 0;
 586
 587         xfs_ilock(ip, XFS_ILOCK_EXCL);
 588         error = xfs_qm_dqattach_locked(ip, flags);
 589         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 590
 591         return error;
 592 }
 593
 594 /*
 595  * Release dquots (and their references) if any.
 596  * The inode should be locked EXCL except when this's called by
 597  * xfs_ireclaim.
 598  */
 599 void
 600 xfs_qm_dqdetach(
 601         xfs_inode_t     *ip)
 602 {
 603         if (!(ip->i_udquot || ip->i_gdquot))
 604                 return;
 605
 606         trace_xfs_dquot_dqdetach(ip);
 607
 608         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 609         if (ip->i_udquot) {
 610                 xfs_qm_dqrele(ip->i_udquot);
 611                 ip->i_udquot = NULL;
 612         }
 613         if (ip->i_gdquot) {
 614                 xfs_qm_dqrele(ip->i_gdquot);
 615                 ip->i_gdquot = NULL;
 616         }
 617 }
 618
 619 int
 620 xfs_qm_calc_dquots_per_chunk(
 621         struct xfs_mount        *mp,
 622         unsigned int            nbblks) /* basic block units */
 623 {
 624         unsigned int    ndquots;
 625
 626         ASSERT(nbblks > 0);
 627         ndquots = BBTOB(nbblks);
 628         do_div(ndquots, sizeof(xfs_dqblk_t));
 629
 630         return ndquots;
 631 }
 632
 633 /*
 634  * This initializes all the quota information that's kept in the
 635  * mount structure
 636  */
 637 STATIC int
 638 xfs_qm_init_quotainfo(
 639         xfs_mount_t     *mp)
 640 {
 641         xfs_quotainfo_t *qinf;
 642         int             error;
 643         xfs_dquot_t     *dqp;
 644
 645         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 646
 647         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 648
 649         /*
 650          * See if quotainodes are setup, and if not, allocate them,
 651          * and change the superblock accordingly.
 652          */
 653         if ((error = xfs_qm_init_quotainos(mp))) {
 654                 kmem_free(qinf);
 655                 mp->m_quotainfo = NULL;
 656                 return error;
 657         }
 658
 659         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 660         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 661         mutex_init(&qinf->qi_tree_lock);
 662
 663         INIT_LIST_HEAD(&qinf->qi_lru_list);
 664         qinf->qi_lru_count = 0;
 665         mutex_init(&qinf->qi_lru_lock);
 666
 667         /* mutex used to serialize quotaoffs */
 668         mutex_init(&qinf->qi_quotaofflock);
 669
 670         /* Precalc some constants */
 671         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 672         qinf->qi_dqperchunk = xfs_qm_calc_dquots_per_chunk(mp,
 673                                                         qinf->qi_dqchunklen);
 674
 675         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 676
 677         /*
 678          * We try to get the limits from the superuser's limits fields.
 679          * This is quite hacky, but it is standard quota practice.
 680          *
 681          * We look at the USR dquot with id == 0 first, but if user quotas
 682          * are not enabled we goto the GRP dquot with id == 0.
 683          * We don't really care to keep separate default limits for user
 684          * and group quotas, at least not at this point.
 685          *
 686          * Since we may not have done a quotacheck by this point, just read
 687          * the dquot without attaching it to any hashtables or lists.
 688          */
 689         error = xfs_qm_dqread(mp, 0,
 690                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 691                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 692                           XFS_DQ_PROJ),
 693                         XFS_QMOPT_DOWARN, &dqp);
 694         if (!error) {
 695                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 696
 697                 /*
 698                  * The warnings and timers set the grace period given to
 699                  * a user or group before he or she can not perform any
 700                  * more writing. If it is zero, a default is used.
 701                  */
 702                 qinf->qi_btimelimit = ddqp->d_btimer ?
 703                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 704                 qinf->qi_itimelimit = ddqp->d_itimer ?
 705                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 706                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 707                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 708                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 709                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 710                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 711                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 712                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 713                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 714                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 715                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 716                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 717                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 718                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 719                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 720
 721                 xfs_qm_dqdestroy(dqp);
 722         } else {
 723                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 724                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 725                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 726                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 727                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 728                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 729         }
 730
 731         qinf->qi_shrinker.shrink = xfs_qm_shake;
 732         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 733         register_shrinker(&qinf->qi_shrinker);
 734         return 0;
 735 }
 736
 737
 738 /*
 739  * Gets called when unmounting a filesystem or when all quotas get
 740  * turned off.
 741  * This purges the quota inodes, destroys locks and frees itself.
 742  */
 743 void
 744 xfs_qm_destroy_quotainfo(
 745         xfs_mount_t     *mp)
 746 {
 747         xfs_quotainfo_t *qi;
 748
 749         qi = mp->m_quotainfo;
 750         ASSERT(qi != NULL);
 751
 752         unregister_shrinker(&qi->qi_shrinker);
 753
 754         if (qi->qi_uquotaip) {
 755                 IRELE(qi->qi_uquotaip);
 756                 qi->qi_uquotaip = NULL; /* paranoia */
 757         }
 758         if (qi->qi_gquotaip) {
 759                 IRELE(qi->qi_gquotaip);
 760                 qi->qi_gquotaip = NULL;
 761         }
 762         mutex_destroy(&qi->qi_quotaofflock);
 763         kmem_free(qi);
 764         mp->m_quotainfo = NULL;
 765 }
 766
 767 /*
 768  * Create an inode and return with a reference already taken, but unlocked
 769  * This is how we create quota inodes
 770  */
 771 STATIC int
 772 xfs_qm_qino_alloc(
 773         xfs_mount_t     *mp,
 774         xfs_inode_t     **ip,
 775         __int64_t       sbfields,
 776         uint            flags)
 777 {
 778         xfs_trans_t     *tp;
 779         int             error;
 780         int             committed;
 781
 782         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 783         if ((error = xfs_trans_reserve(tp,
 784                                       XFS_QM_QINOCREATE_SPACE_RES(mp),
 785                                       XFS_CREATE_LOG_RES(mp), 0,
 786                                       XFS_TRANS_PERM_LOG_RES,
 787                                       XFS_CREATE_LOG_COUNT))) {
 788                 xfs_trans_cancel(tp, 0);
 789                 return error;
 790         }
 791
 792         error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 793         if (error) {
 794                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 795                                  XFS_TRANS_ABORT);
 796                 return error;
 797         }
 798
 799         /*
 800          * Make the changes in the superblock, and log those too.
 801          * sbfields arg may contain fields other than *QUOTINO;
 802          * VERSIONNUM for example.
 803          */
 804         spin_lock(&mp->m_sb_lock);
 805         if (flags & XFS_QMOPT_SBVERSION) {
 806                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 807                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 808                                    XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 809                        (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 810                         XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 811
 812                 xfs_sb_version_addquota(&mp->m_sb);
 813                 mp->m_sb.sb_uquotino = NULLFSINO;
 814                 mp->m_sb.sb_gquotino = NULLFSINO;
 815
 816                 /* qflags will get updated _after_ quotacheck */
 817                 mp->m_sb.sb_qflags = 0;
 818         }
 819         if (flags & XFS_QMOPT_UQUOTA)
 820                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 821         else
 822                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 823         spin_unlock(&mp->m_sb_lock);
 824         xfs_mod_sb(tp, sbfields);
 825
 826         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 827                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 828                 return error;
 829         }
 830         return 0;
 831 }
 832
 833
 834 STATIC void
 835 xfs_qm_reset_dqcounts(
 836         xfs_mount_t     *mp,
 837         xfs_buf_t       *bp,
 838         xfs_dqid_t      id,
 839         uint            type)
 840 {
 841         struct xfs_dqblk        *dqb;
 842         int                     j;
 843
 844         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 845
 846         /*
 847          * Reset all counters and timers. They'll be
 848          * started afresh by xfs_qm_quotacheck.
 849          */
 850 #ifdef DEBUG
 851         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 852         do_div(j, sizeof(xfs_dqblk_t));
 853         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 854 #endif
 855         dqb = bp->b_addr;
 856         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 857                 struct xfs_disk_dquot   *ddq;
 858
 859                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 860
 861                 /*
 862                  * Do a sanity check, and if needed, repair the dqblk. Don't
 863                  * output any warnings because it's perfectly possible to
 864                  * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 865                  */
 866                 (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 867                                       "xfs_quotacheck");
 868                 ddq->d_bcount = 0;
 869                 ddq->d_icount = 0;
 870                 ddq->d_rtbcount = 0;
 871                 ddq->d_btimer = 0;
 872                 ddq->d_itimer = 0;
 873                 ddq->d_rtbtimer = 0;
 874                 ddq->d_bwarns = 0;
 875                 ddq->d_iwarns = 0;
 876                 ddq->d_rtbwarns = 0;
 877
 878                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 879                         xfs_update_cksum((char *)&dqb[j],
 880                                          sizeof(struct xfs_dqblk),
 881                                          XFS_DQUOT_CRC_OFF);
 882                 }
 883         }
 884 }
 885
 886 STATIC int
 887 xfs_qm_dqiter_bufs(
 888         struct xfs_mount        *mp,
 889         xfs_dqid_t              firstid,
 890         xfs_fsblock_t           bno,
 891         xfs_filblks_t           blkcnt,
 892         uint                    flags,
 893         struct list_head        *buffer_list)
 894 {
 895         struct xfs_buf          *bp;
 896         int                     error;
 897         int                     type;
 898
 899         ASSERT(blkcnt > 0);
 900         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 901                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 902         error = 0;
 903
 904         /*
 905          * Blkcnt arg can be a very big number, and might even be
 906          * larger than the log itself. So, we have to break it up into
 907          * manageable-sized transactions.
 908          * Note that we don't start a permanent transaction here; we might
 909          * not be able to get a log reservation for the whole thing up front,
 910          * and we don't really care to either, because we just discard
 911          * everything if we were to crash in the middle of this loop.
 912          */
 913         while (blkcnt--) {
 914                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 915                               XFS_FSB_TO_DADDR(mp, bno),
 916                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 917                               &xfs_dquot_buf_ops);
 918
 919                 /*
 920                  * CRC and validation errors will return a EFSCORRUPTED here. If
 921                  * this occurs, re-read without CRC validation so that we can
 922                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 923                  * will leave a trace in the log indicating corruption has
 924                  * been detected.
 925                  */
 926                 if (error == EFSCORRUPTED) {
 927                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 928                                       XFS_FSB_TO_DADDR(mp, bno),
 929                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 930                                       NULL);
 931                 }
 932
 933                 if (error)
 934                         break;
 935
 936                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 937                 xfs_buf_delwri_queue(bp, buffer_list);
 938                 xfs_buf_relse(bp);
 939
 940                 /* goto the next block. */
 941                 bno++;
 942                 firstid += mp->m_quotainfo->qi_dqperchunk;
 943         }
 944
 945         return error;
 946 }
 947
 948 /*
 949  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 950  * caller supplied function for every chunk of dquots that we find.
 951  */
 952 STATIC int
 953 xfs_qm_dqiterate(
 954         struct xfs_mount        *mp,
 955         struct xfs_inode        *qip,
 956         uint                    flags,
 957         struct list_head        *buffer_list)
 958 {
 959         struct xfs_bmbt_irec    *map;
 960         int                     i, nmaps;       /* number of map entries */
 961         int                     error;          /* return value */
 962         xfs_fileoff_t           lblkno;
 963         xfs_filblks_t           maxlblkcnt;
 964         xfs_dqid_t              firstid;
 965         xfs_fsblock_t           rablkno;
 966         xfs_filblks_t           rablkcnt;
 967
 968         error = 0;
 969         /*
 970          * This looks racy, but we can't keep an inode lock across a
 971          * trans_reserve. But, this gets called during quotacheck, and that
 972          * happens only at mount time which is single threaded.
 973          */
 974         if (qip->i_d.di_nblocks == 0)
 975                 return 0;
 976
 977         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 978
 979         lblkno = 0;
 980         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 981         do {
 982                 nmaps = XFS_DQITER_MAP_SIZE;
 983                 /*
 984                  * We aren't changing the inode itself. Just changing
 985                  * some of its data. No new blocks are added here, and
 986                  * the inode is never added to the transaction.
 987                  */
 988                 xfs_ilock(qip, XFS_ILOCK_SHARED);
 989                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 990                                        map, &nmaps, 0);
 991                 xfs_iunlock(qip, XFS_ILOCK_SHARED);
 992                 if (error)
 993                         break;
 994
 995                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 996                 for (i = 0; i < nmaps; i++) {
 997                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 998                         ASSERT(map[i].br_blockcount);
 999
1000
1001                         lblkno += map[i].br_blockcount;
1002
1003                         if (map[i].br_startblock == HOLESTARTBLOCK)
1004                                 continue;
1005
1006                         firstid = (xfs_dqid_t) map[i].br_startoff *
1007                                 mp->m_quotainfo->qi_dqperchunk;
1008                         /*
1009                          * Do a read-ahead on the next extent.
1010                          */
1011                         if ((i+1 < nmaps) &&
1012                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1013                                 rablkcnt =  map[i+1].br_blockcount;
1014                                 rablkno = map[i+1].br_startblock;
1015                                 while (rablkcnt--) {
1016                                         xfs_buf_readahead(mp->m_ddev_targp,
1017                                                XFS_FSB_TO_DADDR(mp, rablkno),
1018                                                mp->m_quotainfo->qi_dqchunklen,
1019                                                NULL);
1020                                         rablkno++;
1021                                 }
1022                         }
1023                         /*
1024                          * Iterate thru all the blks in the extent and
1025                          * reset the counters of all the dquots inside them.
1026                          */
1027                         error = xfs_qm_dqiter_bufs(mp, firstid,
1028                                                    map[i].br_startblock,
1029                                                    map[i].br_blockcount,
1030                                                    flags, buffer_list);
1031                         if (error)
1032                                 goto out;
1033                 }
1034         } while (nmaps > 0);
1035
1036 out:
1037         kmem_free(map);
1038         return error;
1039 }
1040
1041 /*
1042  * Called by dqusage_adjust in doing a quotacheck.
1043  *
1044  * Given the inode, and a dquot id this updates both the incore dqout as well
1045  * as the buffer copy. This is so that once the quotacheck is done, we can
1046  * just log all the buffers, as opposed to logging numerous updates to
1047  * individual dquots.
1048  */
1049 STATIC int
1050 xfs_qm_quotacheck_dqadjust(
1051         struct xfs_inode        *ip,
1052         xfs_dqid_t              id,
1053         uint                    type,
1054         xfs_qcnt_t              nblks,
1055         xfs_qcnt_t              rtblks)
1056 {
1057         struct xfs_mount        *mp = ip->i_mount;
1058         struct xfs_dquot        *dqp;
1059         int                     error;
1060
1061         error = xfs_qm_dqget(mp, ip, id, type,
1062                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1063         if (error) {
1064                 /*
1065                  * Shouldn't be able to turn off quotas here.
1066                  */
1067                 ASSERT(error != ESRCH);
1068                 ASSERT(error != ENOENT);
1069                 return error;
1070         }
1071
1072         trace_xfs_dqadjust(dqp);
1073
1074         /*
1075          * Adjust the inode count and the block count to reflect this inode's
1076          * resource usage.
1077          */
1078         be64_add_cpu(&dqp->q_core.d_icount, 1);
1079         dqp->q_res_icount++;
1080         if (nblks) {
1081                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1082                 dqp->q_res_bcount += nblks;
1083         }
1084         if (rtblks) {
1085                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1086                 dqp->q_res_rtbcount += rtblks;
1087         }
1088
1089         /*
1090          * Set default limits, adjust timers (since we changed usages)
1091          *
1092          * There are no timers for the default values set in the root dquot.
1093          */
1094         if (dqp->q_core.d_id) {
1095                 xfs_qm_adjust_dqlimits(mp, dqp);
1096                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1097         }
1098
1099         dqp->dq_flags |= XFS_DQ_DIRTY;
1100         xfs_qm_dqput(dqp);
1101         return 0;
1102 }
1103
1104 STATIC int
1105 xfs_qm_get_rtblks(
1106         xfs_inode_t     *ip,
1107         xfs_qcnt_t      *O_rtblks)
1108 {
1109         xfs_filblks_t   rtblks;                 /* total rt blks */
1110         xfs_extnum_t    idx;                    /* extent record index */
1111         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1112         xfs_extnum_t    nextents;               /* number of extent entries */
1113         int             error;
1114
1115         ASSERT(XFS_IS_REALTIME_INODE(ip));
1116         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1117         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1118                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1119                         return error;
1120         }
1121         rtblks = 0;
1122         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1123         for (idx = 0; idx < nextents; idx++)
1124                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1125         *O_rtblks = (xfs_qcnt_t)rtblks;
1126         return 0;
1127 }
1128
1129 /*
1130  * callback routine supplied to bulkstat(). Given an inumber, find its
1131  * dquots and update them to account for resources taken by that inode.
1132  */
1133 /* ARGSUSED */
1134 STATIC int
1135 xfs_qm_dqusage_adjust(
1136         xfs_mount_t     *mp,            /* mount point for filesystem */
1137         xfs_ino_t       ino,            /* inode number to get data for */
1138         void            __user *buffer, /* not used */
1139         int             ubsize,         /* not used */
1140         int             *ubused,        /* not used */
1141         int             *res)           /* result code value */
1142 {
1143         xfs_inode_t     *ip;
1144         xfs_qcnt_t      nblks, rtblks = 0;
1145         int             error;
1146
1147         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1148
1149         /*
1150          * rootino must have its resources accounted for, not so with the quota
1151          * inodes.
1152          */
1153         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1154                 *res = BULKSTAT_RV_NOTHING;
1155                 return XFS_ERROR(EINVAL);
1156         }
1157
1158         /*
1159          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1160          * interface expects the inode to be exclusively locked because that's
1161          * the case in all other instances. It's OK that we do this because
1162          * quotacheck is done only at mount time.
1163          */
1164         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1165         if (error) {
1166                 *res = BULKSTAT_RV_NOTHING;
1167                 return error;
1168         }
1169
1170         ASSERT(ip->i_delayed_blks == 0);
1171
1172         if (XFS_IS_REALTIME_INODE(ip)) {
1173                 /*
1174                  * Walk thru the extent list and count the realtime blocks.
1175                  */
1176                 error = xfs_qm_get_rtblks(ip, &rtblks);
1177                 if (error)
1178                         goto error0;
1179         }
1180
1181         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1182
1183         /*
1184          * Add the (disk blocks and inode) resources occupied by this
1185          * inode to its dquots. We do this adjustment in the incore dquot,
1186          * and also copy the changes to its buffer.
1187          * We don't care about putting these changes in a transaction
1188          * envelope because if we crash in the middle of a 'quotacheck'
1189          * we have to start from the beginning anyway.
1190          * Once we're done, we'll log all the dquot bufs.
1191          *
1192          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1193          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1194          */
1195         if (XFS_IS_UQUOTA_ON(mp)) {
1196                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1197                                                    XFS_DQ_USER, nblks, rtblks);
1198                 if (error)
1199                         goto error0;
1200         }
1201
1202         if (XFS_IS_GQUOTA_ON(mp)) {
1203                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1204                                                    XFS_DQ_GROUP, nblks, rtblks);
1205                 if (error)
1206                         goto error0;
1207         }
1208
1209         if (XFS_IS_PQUOTA_ON(mp)) {
1210                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1211                                                    XFS_DQ_PROJ, nblks, rtblks);
1212                 if (error)
1213                         goto error0;
1214         }
1215
1216         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1217         IRELE(ip);
1218         *res = BULKSTAT_RV_DIDONE;
1219         return 0;
1220
1221 error0:
1222         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1223         IRELE(ip);
1224         *res = BULKSTAT_RV_GIVEUP;
1225         return error;
1226 }
1227
1228 STATIC int
1229 xfs_qm_flush_one(
1230         struct xfs_dquot        *dqp,
1231         void                    *data)
1232 {
1233         struct list_head        *buffer_list = data;
1234         struct xfs_buf          *bp = NULL;
1235         int                     error = 0;
1236
1237         xfs_dqlock(dqp);
1238         if (dqp->dq_flags & XFS_DQ_FREEING)
1239                 goto out_unlock;
1240         if (!XFS_DQ_IS_DIRTY(dqp))
1241                 goto out_unlock;
1242
1243         xfs_dqflock(dqp);
1244         error = xfs_qm_dqflush(dqp, &bp);
1245         if (error)
1246                 goto out_unlock;
1247
1248         xfs_buf_delwri_queue(bp, buffer_list);
1249         xfs_buf_relse(bp);
1250 out_unlock:
1251         xfs_dqunlock(dqp);
1252         return error;
1253 }
1254
1255 /*
1256  * Walk thru all the filesystem inodes and construct a consistent view
1257  * of the disk quota world. If the quotacheck fails, disable quotas.
1258  */
1259 int
1260 xfs_qm_quotacheck(
1261         xfs_mount_t     *mp)
1262 {
1263         int             done, count, error, error2;
1264         xfs_ino_t       lastino;
1265         size_t          structsz;
1266         xfs_inode_t     *uip, *gip;
1267         uint            flags;
1268         LIST_HEAD       (buffer_list);
1269
1270         count = INT_MAX;
1271         structsz = 1;
1272         lastino = 0;
1273         flags = 0;
1274
1275         ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1276         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1277
1278         xfs_notice(mp, "Quotacheck needed: Please wait.");
1279
1280         /*
1281          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1282          * their counters to zero. We need a clean slate.
1283          * We don't log our changes till later.
1284          */
1285         uip = mp->m_quotainfo->qi_uquotaip;
1286         if (uip) {
1287                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1288                                          &buffer_list);
1289                 if (error)
1290                         goto error_return;
1291                 flags |= XFS_UQUOTA_CHKD;
1292         }
1293
1294         gip = mp->m_quotainfo->qi_gquotaip;
1295         if (gip) {
1296                 error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1297                                          XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA,
1298                                          &buffer_list);
1299                 if (error)
1300                         goto error_return;
1301                 flags |= XFS_OQUOTA_CHKD;
1302         }
1303
1304         do {
1305                 /*
1306                  * Iterate thru all the inodes in the file system,
1307                  * adjusting the corresponding dquot counters in core.
1308                  */
1309                 error = xfs_bulkstat(mp, &lastino, &count,
1310                                      xfs_qm_dqusage_adjust,
1311                                      structsz, NULL, &done);
1312                 if (error)
1313                         break;
1314
1315         } while (!done);
1316
1317         /*
1318          * We've made all the changes that we need to make incore.  Flush them
1319          * down to disk buffers if everything was updated successfully.
1320          */
1321         if (XFS_IS_UQUOTA_ON(mp)) {
1322                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1323                                           &buffer_list);
1324         }
1325         if (XFS_IS_GQUOTA_ON(mp)) {
1326                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1327                                            &buffer_list);
1328                 if (!error)
1329                         error = error2;
1330         }
1331         if (XFS_IS_PQUOTA_ON(mp)) {
1332                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1333                                            &buffer_list);
1334                 if (!error)
1335                         error = error2;
1336         }
1337
1338         error2 = xfs_buf_delwri_submit(&buffer_list);
1339         if (!error)
1340                 error = error2;
1341
1342         /*
1343          * We can get this error if we couldn't do a dquot allocation inside
1344          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1345          * dirty dquots that might be cached, we just want to get rid of them
1346          * and turn quotaoff. The dquots won't be attached to any of the inodes
1347          * at this point (because we intentionally didn't in dqget_noattach).
1348          */
1349         if (error) {
1350                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1351                 goto error_return;
1352         }
1353
1354         /*
1355          * If one type of quotas is off, then it will lose its
1356          * quotachecked status, since we won't be doing accounting for
1357          * that type anymore.
1358          */
1359         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1360         mp->m_qflags |= flags;
1361
1362  error_return:
1363         while (!list_empty(&buffer_list)) {
1364                 struct xfs_buf *bp =
1365                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1366                 list_del_init(&bp->b_list);
1367                 xfs_buf_relse(bp);
1368         }
1369
1370         if (error) {
1371                 xfs_warn(mp,
1372         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1373                         error);
1374                 /*
1375                  * We must turn off quotas.
1376                  */
1377                 ASSERT(mp->m_quotainfo != NULL);
1378                 xfs_qm_destroy_quotainfo(mp);
1379                 if (xfs_mount_reset_sbqflags(mp)) {
1380                         xfs_warn(mp,
1381                                 "Quotacheck: Failed to reset quota flags.");
1382                 }
1383         } else
1384                 xfs_notice(mp, "Quotacheck: Done.");
1385         return (error);
1386 }
1387
1388 /*
1389  * This is called after the superblock has been read in and we're ready to
1390  * iget the quota inodes.
1391  */
1392 STATIC int
1393 xfs_qm_init_quotainos(
1394         xfs_mount_t     *mp)
1395 {
1396         xfs_inode_t     *uip, *gip;
1397         int             error;
1398         __int64_t       sbflags;
1399         uint            flags;
1400
1401         ASSERT(mp->m_quotainfo);
1402         uip = gip = NULL;
1403         sbflags = 0;
1404         flags = 0;
1405
1406         /*
1407          * Get the uquota and gquota inodes
1408          */
1409         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1410                 if (XFS_IS_UQUOTA_ON(mp) &&
1411                     mp->m_sb.sb_uquotino != NULLFSINO) {
1412                         ASSERT(mp->m_sb.sb_uquotino > 0);
1413                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1414                                              0, 0, &uip)))
1415                                 return XFS_ERROR(error);
1416                 }
1417                 if (XFS_IS_OQUOTA_ON(mp) &&
1418                     mp->m_sb.sb_gquotino != NULLFSINO) {
1419                         ASSERT(mp->m_sb.sb_gquotino > 0);
1420                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1421                                              0, 0, &gip))) {
1422                                 if (uip)
1423                                         IRELE(uip);
1424                                 return XFS_ERROR(error);
1425                         }
1426                 }
1427         } else {
1428                 flags |= XFS_QMOPT_SBVERSION;
1429                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1430                             XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1431         }
1432
1433         /*
1434          * Create the two inodes, if they don't exist already. The changes
1435          * made above will get added to a transaction and logged in one of
1436          * the qino_alloc calls below.  If the device is readonly,
1437          * temporarily switch to read-write to do this.
1438          */
1439         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1440                 if ((error = xfs_qm_qino_alloc(mp, &uip,
1441                                               sbflags | XFS_SB_UQUOTINO,
1442                                               flags | XFS_QMOPT_UQUOTA)))
1443                         return XFS_ERROR(error);
1444
1445                 flags &= ~XFS_QMOPT_SBVERSION;
1446         }
1447         if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1448                 flags |= (XFS_IS_GQUOTA_ON(mp) ?
1449                                 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1450                 error = xfs_qm_qino_alloc(mp, &gip,
1451                                           sbflags | XFS_SB_GQUOTINO, flags);
1452                 if (error) {
1453                         if (uip)
1454                                 IRELE(uip);
1455
1456                         return XFS_ERROR(error);
1457                 }
1458         }
1459
1460         mp->m_quotainfo->qi_uquotaip = uip;
1461         mp->m_quotainfo->qi_gquotaip = gip;
1462
1463         return 0;
1464 }
1465
1466 STATIC void
1467 xfs_qm_dqfree_one(
1468         struct xfs_dquot        *dqp)
1469 {
1470         struct xfs_mount        *mp = dqp->q_mount;
1471         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1472
1473         mutex_lock(&qi->qi_tree_lock);
1474         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1475                           be32_to_cpu(dqp->q_core.d_id));
1476
1477         qi->qi_dquots--;
1478         mutex_unlock(&qi->qi_tree_lock);
1479
1480         xfs_qm_dqdestroy(dqp);
1481 }
1482
1483 STATIC void
1484 xfs_qm_dqreclaim_one(
1485         struct xfs_dquot        *dqp,
1486         struct list_head        *buffer_list,
1487         struct list_head        *dispose_list)
1488 {
1489         struct xfs_mount        *mp = dqp->q_mount;
1490         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1491         int                     error;
1492
1493         if (!xfs_dqlock_nowait(dqp))
1494                 goto out_move_tail;
1495
1496         /*
1497          * This dquot has acquired a reference in the meantime remove it from
1498          * the freelist and try again.
1499          */
1500         if (dqp->q_nrefs) {
1501                 xfs_dqunlock(dqp);
1502
1503                 trace_xfs_dqreclaim_want(dqp);
1504                 XFS_STATS_INC(xs_qm_dqwants);
1505
1506                 list_del_init(&dqp->q_lru);
1507                 qi->qi_lru_count--;
1508                 XFS_STATS_DEC(xs_qm_dquot_unused);
1509                 return;
1510         }
1511
1512         /*
1513          * Try to grab the flush lock. If this dquot is in the process of
1514          * getting flushed to disk, we don't want to reclaim it.
1515          */
1516         if (!xfs_dqflock_nowait(dqp))
1517                 goto out_unlock_move_tail;
1518
1519         if (XFS_DQ_IS_DIRTY(dqp)) {
1520                 struct xfs_buf  *bp = NULL;
1521
1522                 trace_xfs_dqreclaim_dirty(dqp);
1523
1524                 error = xfs_qm_dqflush(dqp, &bp);
1525                 if (error) {
1526                         xfs_warn(mp, "%s: dquot %p flush failed",
1527                                  __func__, dqp);
1528                         goto out_unlock_move_tail;
1529                 }
1530
1531                 xfs_buf_delwri_queue(bp, buffer_list);
1532                 xfs_buf_relse(bp);
1533                 /*
1534                  * Give the dquot another try on the freelist, as the
1535                  * flushing will take some time.
1536                  */
1537                 goto out_unlock_move_tail;
1538         }
1539         xfs_dqfunlock(dqp);
1540
1541         /*
1542          * Prevent lookups now that we are past the point of no return.
1543          */
1544         dqp->dq_flags |= XFS_DQ_FREEING;
1545         xfs_dqunlock(dqp);
1546
1547         ASSERT(dqp->q_nrefs == 0);
1548         list_move_tail(&dqp->q_lru, dispose_list);
1549         qi->qi_lru_count--;
1550         XFS_STATS_DEC(xs_qm_dquot_unused);
1551
1552         trace_xfs_dqreclaim_done(dqp);
1553         XFS_STATS_INC(xs_qm_dqreclaims);
1554         return;
1555
1556         /*
1557          * Move the dquot to the tail of the list so that we don't spin on it.
1558          */
1559 out_unlock_move_tail:
1560         xfs_dqunlock(dqp);
1561 out_move_tail:
1562         list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1563         trace_xfs_dqreclaim_busy(dqp);
1564         XFS_STATS_INC(xs_qm_dqreclaim_misses);
1565 }
1566
1567 STATIC int
1568 xfs_qm_shake(
1569         struct shrinker         *shrink,
1570         struct shrink_control   *sc)
1571 {
1572         struct xfs_quotainfo    *qi =
1573                 container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1574         int                     nr_to_scan = sc->nr_to_scan;
1575         LIST_HEAD               (buffer_list);
1576         LIST_HEAD               (dispose_list);
1577         struct xfs_dquot        *dqp;
1578         int                     error;
1579
1580         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1581                 return 0;
1582         if (!nr_to_scan)
1583                 goto out;
1584
1585         mutex_lock(&qi->qi_lru_lock);
1586         while (!list_empty(&qi->qi_lru_list)) {
1587                 if (nr_to_scan-- <= 0)
1588                         break;
1589                 dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1590                                        q_lru);
1591                 xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
1592         }
1593         mutex_unlock(&qi->qi_lru_lock);
1594
1595         error = xfs_buf_delwri_submit(&buffer_list);
1596         if (error)
1597                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
1598
1599         while (!list_empty(&dispose_list)) {
1600                 dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1601                 list_del_init(&dqp->q_lru);
1602                 xfs_qm_dqfree_one(dqp);
1603         }
1604
1605 out:
1606         return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1607 }
1608
1609 /*
1610  * Start a transaction and write the incore superblock changes to
1611  * disk. flags parameter indicates which fields have changed.
1612  */
1613 int
1614 xfs_qm_write_sb_changes(
1615         xfs_mount_t     *mp,
1616         __int64_t       flags)
1617 {
1618         xfs_trans_t     *tp;
1619         int             error;
1620
1621         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1622         error = xfs_trans_reserve(tp, 0, XFS_QM_SBCHANGE_LOG_RES(mp),
1623                                   0, 0, XFS_DEFAULT_LOG_COUNT);
1624         if (error) {
1625                 xfs_trans_cancel(tp, 0);
1626                 return error;
1627         }
1628
1629         xfs_mod_sb(tp, flags);
1630         error = xfs_trans_commit(tp, 0);
1631
1632         return error;
1633 }
1634
1635
1636 /* --------------- utility functions for vnodeops ---------------- */
1637
1638
1639 /*
1640  * Given an inode, a uid, gid and prid make sure that we have
1641  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1642  * quotas by creating this file.
1643  * This also attaches dquot(s) to the given inode after locking it,
1644  * and returns the dquots corresponding to the uid and/or gid.
1645  *
1646  * in   : inode (unlocked)
1647  * out  : udquot, gdquot with references taken and unlocked
1648  */
1649 int
1650 xfs_qm_vop_dqalloc(
1651         struct xfs_inode        *ip,
1652         uid_t                   uid,
1653         gid_t                   gid,
1654         prid_t                  prid,
1655         uint                    flags,
1656         struct xfs_dquot        **O_udqpp,
1657         struct xfs_dquot        **O_gdqpp)
1658 {
1659         struct xfs_mount        *mp = ip->i_mount;
1660         struct xfs_dquot        *uq, *gq;
1661         int                     error;
1662         uint                    lockflags;
1663
1664         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1665                 return 0;
1666
1667         lockflags = XFS_ILOCK_EXCL;
1668         xfs_ilock(ip, lockflags);
1669
1670         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1671                 gid = ip->i_d.di_gid;
1672
1673         /*
1674          * Attach the dquot(s) to this inode, doing a dquot allocation
1675          * if necessary. The dquot(s) will not be locked.
1676          */
1677         if (XFS_NOT_DQATTACHED(mp, ip)) {
1678                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1679                 if (error) {
1680                         xfs_iunlock(ip, lockflags);
1681                         return error;
1682                 }
1683         }
1684
1685         uq = gq = NULL;
1686         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1687                 if (ip->i_d.di_uid != uid) {
1688                         /*
1689                          * What we need is the dquot that has this uid, and
1690                          * if we send the inode to dqget, the uid of the inode
1691                          * takes priority over what's sent in the uid argument.
1692                          * We must unlock inode here before calling dqget if
1693                          * we're not sending the inode, because otherwise
1694                          * we'll deadlock by doing trans_reserve while
1695                          * holding ilock.
1696                          */
1697                         xfs_iunlock(ip, lockflags);
1698                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1699                                                  XFS_DQ_USER,
1700                                                  XFS_QMOPT_DQALLOC |
1701                                                  XFS_QMOPT_DOWARN,
1702                                                  &uq))) {
1703                                 ASSERT(error != ENOENT);
1704                                 return error;
1705                         }
1706                         /*
1707                          * Get the ilock in the right order.
1708                          */
1709                         xfs_dqunlock(uq);
1710                         lockflags = XFS_ILOCK_SHARED;
1711                         xfs_ilock(ip, lockflags);
1712                 } else {
1713                         /*
1714                          * Take an extra reference, because we'll return
1715                          * this to caller
1716                          */
1717                         ASSERT(ip->i_udquot);
1718                         uq = xfs_qm_dqhold(ip->i_udquot);
1719                 }
1720         }
1721         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1722                 if (ip->i_d.di_gid != gid) {
1723                         xfs_iunlock(ip, lockflags);
1724                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1725                                                  XFS_DQ_GROUP,
1726                                                  XFS_QMOPT_DQALLOC |
1727                                                  XFS_QMOPT_DOWARN,
1728                                                  &gq))) {
1729                                 if (uq)
1730                                         xfs_qm_dqrele(uq);
1731                                 ASSERT(error != ENOENT);
1732                                 return error;
1733                         }
1734                         xfs_dqunlock(gq);
1735                         lockflags = XFS_ILOCK_SHARED;
1736                         xfs_ilock(ip, lockflags);
1737                 } else {
1738                         ASSERT(ip->i_gdquot);
1739                         gq = xfs_qm_dqhold(ip->i_gdquot);
1740                 }
1741         } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1742                 if (xfs_get_projid(ip) != prid) {
1743                         xfs_iunlock(ip, lockflags);
1744                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1745                                                  XFS_DQ_PROJ,
1746                                                  XFS_QMOPT_DQALLOC |
1747                                                  XFS_QMOPT_DOWARN,
1748                                                  &gq))) {
1749                                 if (uq)
1750                                         xfs_qm_dqrele(uq);
1751                                 ASSERT(error != ENOENT);
1752                                 return (error);
1753                         }
1754                         xfs_dqunlock(gq);
1755                         lockflags = XFS_ILOCK_SHARED;
1756                         xfs_ilock(ip, lockflags);
1757                 } else {
1758                         ASSERT(ip->i_gdquot);
1759                         gq = xfs_qm_dqhold(ip->i_gdquot);
1760                 }
1761         }
1762         if (uq)
1763                 trace_xfs_dquot_dqalloc(ip);
1764
1765         xfs_iunlock(ip, lockflags);
1766         if (O_udqpp)
1767                 *O_udqpp = uq;
1768         else if (uq)
1769                 xfs_qm_dqrele(uq);
1770         if (O_gdqpp)
1771                 *O_gdqpp = gq;
1772         else if (gq)
1773                 xfs_qm_dqrele(gq);
1774         return 0;
1775 }
1776
1777 /*
1778  * Actually transfer ownership, and do dquot modifications.
1779  * These were already reserved.
1780  */
1781 xfs_dquot_t *
1782 xfs_qm_vop_chown(
1783         xfs_trans_t     *tp,
1784         xfs_inode_t     *ip,
1785         xfs_dquot_t     **IO_olddq,
1786         xfs_dquot_t     *newdq)
1787 {
1788         xfs_dquot_t     *prevdq;
1789         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1790                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1791
1792
1793         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1794         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1795
1796         /* old dquot */
1797         prevdq = *IO_olddq;
1798         ASSERT(prevdq);
1799         ASSERT(prevdq != newdq);
1800
1801         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1802         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1803
1804         /* the sparkling new dquot */
1805         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1806         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1807
1808         /*
1809          * Take an extra reference, because the inode is going to keep
1810          * this dquot pointer even after the trans_commit.
1811          */
1812         *IO_olddq = xfs_qm_dqhold(newdq);
1813
1814         return prevdq;
1815 }
1816
1817 /*
1818  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1819  */
1820 int
1821 xfs_qm_vop_chown_reserve(
1822         xfs_trans_t     *tp,
1823         xfs_inode_t     *ip,
1824         xfs_dquot_t     *udqp,
1825         xfs_dquot_t     *gdqp,
1826         uint            flags)
1827 {
1828         xfs_mount_t     *mp = ip->i_mount;
1829         uint            delblks, blkflags, prjflags = 0;
1830         xfs_dquot_t     *unresudq, *unresgdq, *delblksudq, *delblksgdq;
1831         int             error;
1832
1833
1834         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1835         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1836
1837         delblks = ip->i_delayed_blks;
1838         delblksudq = delblksgdq = unresudq = unresgdq = NULL;
1839         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1840                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1841
1842         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1843             ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1844                 delblksudq = udqp;
1845                 /*
1846                  * If there are delayed allocation blocks, then we have to
1847                  * unreserve those from the old dquot, and add them to the
1848                  * new dquot.
1849                  */
1850                 if (delblks) {
1851                         ASSERT(ip->i_udquot);
1852                         unresudq = ip->i_udquot;
1853                 }
1854         }
1855         if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
1856                 if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
1857                      xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
1858                         prjflags = XFS_QMOPT_ENOSPC;
1859
1860                 if (prjflags ||
1861                     (XFS_IS_GQUOTA_ON(ip->i_mount) &&
1862                      ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
1863                         delblksgdq = gdqp;
1864                         if (delblks) {
1865                                 ASSERT(ip->i_gdquot);
1866                                 unresgdq = ip->i_gdquot;
1867                         }
1868                 }
1869         }
1870
1871         if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1872                                 delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
1873                                 flags | blkflags | prjflags)))
1874                 return (error);
1875
1876         /*
1877          * Do the delayed blks reservations/unreservations now. Since, these
1878          * are done without the help of a transaction, if a reservation fails
1879          * its previous reservations won't be automatically undone by trans
1880          * code. So, we have to do it manually here.
1881          */
1882         if (delblks) {
1883                 /*
1884                  * Do the reservations first. Unreservation can't fail.
1885                  */
1886                 ASSERT(delblksudq || delblksgdq);
1887                 ASSERT(unresudq || unresgdq);
1888                 if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1889                                 delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
1890                                 flags | blkflags | prjflags)))
1891                         return (error);
1892                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1893                                 unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
1894                                 blkflags);
1895         }
1896
1897         return (0);
1898 }
1899
1900 int
1901 xfs_qm_vop_rename_dqattach(
1902         struct xfs_inode        **i_tab)
1903 {
1904         struct xfs_mount        *mp = i_tab[0]->i_mount;
1905         int                     i;
1906
1907         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1908                 return 0;
1909
1910         for (i = 0; (i < 4 && i_tab[i]); i++) {
1911                 struct xfs_inode        *ip = i_tab[i];
1912                 int                     error;
1913
1914                 /*
1915                  * Watch out for duplicate entries in the table.
1916                  */
1917                 if (i == 0 || ip != i_tab[i-1]) {
1918                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1919                                 error = xfs_qm_dqattach(ip, 0);
1920                                 if (error)
1921                                         return error;
1922                         }
1923                 }
1924         }
1925         return 0;
1926 }
1927
1928 void
1929 xfs_qm_vop_create_dqattach(
1930         struct xfs_trans        *tp,
1931         struct xfs_inode        *ip,
1932         struct xfs_dquot        *udqp,
1933         struct xfs_dquot        *gdqp)
1934 {
1935         struct xfs_mount        *mp = tp->t_mountp;
1936
1937         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1938                 return;
1939
1940         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1941         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1942
1943         if (udqp) {
1944                 ASSERT(ip->i_udquot == NULL);
1945                 ASSERT(XFS_IS_UQUOTA_ON(mp));
1946                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1947
1948                 ip->i_udquot = xfs_qm_dqhold(udqp);
1949                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1950         }
1951         if (gdqp) {
1952                 ASSERT(ip->i_gdquot == NULL);
1953                 ASSERT(XFS_IS_OQUOTA_ON(mp));
1954                 ASSERT((XFS_IS_GQUOTA_ON(mp) ?
1955                         ip->i_d.di_gid : xfs_get_projid(ip)) ==
1956                                 be32_to_cpu(gdqp->q_core.d_id));
1957
1958                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1959                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1960         }
1961 }
1962