fs/xfs/quota/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_dir2.h"
  27 #include "xfs_alloc.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_quota.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_ialloc_btree.h"
  34 #include "xfs_dir2_sf.h"
  35 #include "xfs_attr_sf.h"
  36 #include "xfs_dinode.h"
  37 #include "xfs_inode.h"
  38 #include "xfs_btree.h"
  39 #include "xfs_ialloc.h"
  40 #include "xfs_itable.h"
  41 #include "xfs_rtalloc.h"
  42 #include "xfs_error.h"
  43 #include "xfs_bmap.h"
  44 #include "xfs_rw.h"
  45 #include "xfs_attr.h"
  46 #include "xfs_buf_item.h"
  47 #include "xfs_trans_space.h"
  48 #include "xfs_utils.h"
  49 #include "xfs_qm.h"
  50 #include "xfs_trace.h"
  51
  52 /*
  53  * The global quota manager. There is only one of these for the entire
  54  * system, _not_ one per file system. XQM keeps track of the overall
  55  * quota functionality, including maintaining the freelist and hash
  56  * tables of dquots.
  57  */
  58 struct mutex    xfs_Gqm_lock;
  59 struct xfs_qm   *xfs_Gqm;
  60 uint            ndquot;
  61
  62 kmem_zone_t     *qm_dqzone;
  63 kmem_zone_t     *qm_dqtrxzone;
  64
  65 static cred_t   xfs_zerocr;
  66
  67 STATIC void     xfs_qm_list_init(xfs_dqlist_t *, char *, int);
  68 STATIC void     xfs_qm_list_destroy(xfs_dqlist_t *);
  69
  70 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  71 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  72 STATIC int      xfs_qm_shake(struct shrinker *, int, gfp_t);
  73
  74 static struct shrinker xfs_qm_shaker = {
  75         .shrink = xfs_qm_shake,
  76         .seeks = DEFAULT_SEEKS,
  77 };
  78
  79 #ifdef DEBUG
  80 extern struct mutex     qcheck_lock;
  81 #endif
  82
  83 #ifdef QUOTADEBUG
  84 static void
  85 xfs_qm_dquot_list_print(
  86         struct xfs_mount *mp)
  87 {
  88         xfs_dquot_t     *dqp;
  89         int             i = 0;
  90
  91         list_for_each_entry(dqp, &mp->m_quotainfo->qi_dqlist_lock, qi_mplist) {
  92                 cmn_err(CE_DEBUG, "   %d. \"%d (%s)\"   "
  93                                   "bcnt = %lld, icnt = %lld, refs = %d",
  94                         i++, be32_to_cpu(dqp->q_core.d_id),
  95                         DQFLAGTO_TYPESTR(dqp),
  96                         (long long)be64_to_cpu(dqp->q_core.d_bcount),
  97                         (long long)be64_to_cpu(dqp->q_core.d_icount),
  98                         dqp->q_nrefs);
  99         }
 100 }
 101 #else
 102 static void xfs_qm_dquot_list_print(struct xfs_mount *mp) { }
 103 #endif
 104
 105 /*
 106  * Initialize the XQM structure.
 107  * Note that there is not one quota manager per file system.
 108  */
 109 STATIC struct xfs_qm *
 110 xfs_Gqm_init(void)
 111 {
 112         xfs_dqhash_t    *udqhash, *gdqhash;
 113         xfs_qm_t        *xqm;
 114         size_t          hsize;
 115         uint            i;
 116
 117         /*
 118          * Initialize the dquot hash tables.
 119          */
 120         udqhash = kmem_zalloc_greedy(&hsize,
 121                                      XFS_QM_HASHSIZE_LOW * sizeof(xfs_dqhash_t),
 122                                      XFS_QM_HASHSIZE_HIGH * sizeof(xfs_dqhash_t));
 123         if (!udqhash)
 124                 goto out;
 125
 126         gdqhash = kmem_zalloc_large(hsize);
 127         if (!gdqhash)
 128                 goto out_free_udqhash;
 129
 130         hsize /= sizeof(xfs_dqhash_t);
 131         ndquot = hsize << 8;
 132
 133         xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);
 134         xqm->qm_dqhashmask = hsize - 1;
 135         xqm->qm_usr_dqhtable = udqhash;
 136         xqm->qm_grp_dqhtable = gdqhash;
 137         ASSERT(xqm->qm_usr_dqhtable != NULL);
 138         ASSERT(xqm->qm_grp_dqhtable != NULL);
 139
 140         for (i = 0; i < hsize; i++) {
 141                 xfs_qm_list_init(&(xqm->qm_usr_dqhtable[i]), "uxdqh", i);
 142                 xfs_qm_list_init(&(xqm->qm_grp_dqhtable[i]), "gxdqh", i);
 143         }
 144
 145         /*
 146          * Freelist of all dquots of all file systems
 147          */
 148         INIT_LIST_HEAD(&xqm->qm_dqfrlist);
 149         xqm->qm_dqfrlist_cnt = 0;
 150         mutex_init(&xqm->qm_dqfrlist_lock);
 151
 152         /*
 153          * dquot zone. we register our own low-memory callback.
 154          */
 155         if (!qm_dqzone) {
 156                 xqm->qm_dqzone = kmem_zone_init(sizeof(xfs_dquot_t),
 157                                                 "xfs_dquots");
 158                 qm_dqzone = xqm->qm_dqzone;
 159         } else
 160                 xqm->qm_dqzone = qm_dqzone;
 161
 162         register_shrinker(&xfs_qm_shaker);
 163
 164         /*
 165          * The t_dqinfo portion of transactions.
 166          */
 167         if (!qm_dqtrxzone) {
 168                 xqm->qm_dqtrxzone = kmem_zone_init(sizeof(xfs_dquot_acct_t),
 169                                                    "xfs_dqtrx");
 170                 qm_dqtrxzone = xqm->qm_dqtrxzone;
 171         } else
 172                 xqm->qm_dqtrxzone = qm_dqtrxzone;
 173
 174         atomic_set(&xqm->qm_totaldquots, 0);
 175         xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
 176         xqm->qm_nrefs = 0;
 177 #ifdef DEBUG
 178         mutex_init(&qcheck_lock);
 179 #endif
 180         return xqm;
 181
 182  out_free_udqhash:
 183         kmem_free_large(udqhash);
 184  out:
 185         return NULL;
 186 }
 187
 188 /*
 189  * Destroy the global quota manager when its reference count goes to zero.
 190  */
 191 STATIC void
 192 xfs_qm_destroy(
 193         struct xfs_qm   *xqm)
 194 {
 195         struct xfs_dquot *dqp, *n;
 196         int             hsize, i;
 197
 198         ASSERT(xqm != NULL);
 199         ASSERT(xqm->qm_nrefs == 0);
 200         unregister_shrinker(&xfs_qm_shaker);
 201         hsize = xqm->qm_dqhashmask + 1;
 202         for (i = 0; i < hsize; i++) {
 203                 xfs_qm_list_destroy(&(xqm->qm_usr_dqhtable[i]));
 204                 xfs_qm_list_destroy(&(xqm->qm_grp_dqhtable[i]));
 205         }
 206         kmem_free_large(xqm->qm_usr_dqhtable);
 207         kmem_free_large(xqm->qm_grp_dqhtable);
 208         xqm->qm_usr_dqhtable = NULL;
 209         xqm->qm_grp_dqhtable = NULL;
 210         xqm->qm_dqhashmask = 0;
 211
 212         /* frlist cleanup */
 213         mutex_lock(&xqm->qm_dqfrlist_lock);
 214         list_for_each_entry_safe(dqp, n, &xqm->qm_dqfrlist, q_freelist) {
 215                 xfs_dqlock(dqp);
 216 #ifdef QUOTADEBUG
 217                 cmn_err(CE_DEBUG, "FREELIST destroy 0x%p", dqp);
 218 #endif
 219                 list_del_init(&dqp->q_freelist);
 220                 xfs_Gqm->qm_dqfrlist_cnt--;
 221                 xfs_dqunlock(dqp);
 222                 xfs_qm_dqdestroy(dqp);
 223         }
 224         mutex_unlock(&xqm->qm_dqfrlist_lock);
 225         mutex_destroy(&xqm->qm_dqfrlist_lock);
 226 #ifdef DEBUG
 227         mutex_destroy(&qcheck_lock);
 228 #endif
 229         kmem_free(xqm);
 230 }
 231
 232 /*
 233  * Called at mount time to let XQM know that another file system is
 234  * starting quotas. This isn't crucial information as the individual mount
 235  * structures are pretty independent, but it helps the XQM keep a
 236  * global view of what's going on.
 237  */
 238 /* ARGSUSED */
 239 STATIC int
 240 xfs_qm_hold_quotafs_ref(
 241         struct xfs_mount *mp)
 242 {
 243         /*
 244          * Need to lock the xfs_Gqm structure for things like this. For example,
 245          * the structure could disappear between the entry to this routine and
 246          * a HOLD operation if not locked.
 247          */
 248         mutex_lock(&xfs_Gqm_lock);
 249
 250         if (!xfs_Gqm) {
 251                 xfs_Gqm = xfs_Gqm_init();
 252                 if (!xfs_Gqm) {
 253                         mutex_unlock(&xfs_Gqm_lock);
 254                         return ENOMEM;
 255                 }
 256         }
 257
 258         /*
 259          * We can keep a list of all filesystems with quotas mounted for
 260          * debugging and statistical purposes, but ...
 261          * Just take a reference and get out.
 262          */
 263         xfs_Gqm->qm_nrefs++;
 264         mutex_unlock(&xfs_Gqm_lock);
 265
 266         return 0;
 267 }
 268
 269
 270 /*
 271  * Release the reference that a filesystem took at mount time,
 272  * so that we know when we need to destroy the entire quota manager.
 273  */
 274 /* ARGSUSED */
 275 STATIC void
 276 xfs_qm_rele_quotafs_ref(
 277         struct xfs_mount *mp)
 278 {
 279         xfs_dquot_t     *dqp, *n;
 280
 281         ASSERT(xfs_Gqm);
 282         ASSERT(xfs_Gqm->qm_nrefs > 0);
 283
 284         /*
 285          * Go thru the freelist and destroy all inactive dquots.
 286          */
 287         mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
 288
 289         list_for_each_entry_safe(dqp, n, &xfs_Gqm->qm_dqfrlist, q_freelist) {
 290                 xfs_dqlock(dqp);
 291                 if (dqp->dq_flags & XFS_DQ_INACTIVE) {
 292                         ASSERT(dqp->q_mount == NULL);
 293                         ASSERT(! XFS_DQ_IS_DIRTY(dqp));
 294                         ASSERT(list_empty(&dqp->q_hashlist));
 295                         ASSERT(list_empty(&dqp->q_mplist));
 296                         list_del_init(&dqp->q_freelist);
 297                         xfs_Gqm->qm_dqfrlist_cnt--;
 298                         xfs_dqunlock(dqp);
 299                         xfs_qm_dqdestroy(dqp);
 300                 } else {
 301                         xfs_dqunlock(dqp);
 302                 }
 303         }
 304         mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
 305
 306         /*
 307          * Destroy the entire XQM. If somebody mounts with quotaon, this'll
 308          * be restarted.
 309          */
 310         mutex_lock(&xfs_Gqm_lock);
 311         if (--xfs_Gqm->qm_nrefs == 0) {
 312                 xfs_qm_destroy(xfs_Gqm);
 313                 xfs_Gqm = NULL;
 314         }
 315         mutex_unlock(&xfs_Gqm_lock);
 316 }
 317
 318 /*
 319  * Just destroy the quotainfo structure.
 320  */
 321 void
 322 xfs_qm_unmount(
 323         struct xfs_mount        *mp)
 324 {
 325         if (mp->m_quotainfo) {
 326                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 327                 xfs_qm_destroy_quotainfo(mp);
 328         }
 329 }
 330
 331
 332 /*
 333  * This is called from xfs_mountfs to start quotas and initialize all
 334  * necessary data structures like quotainfo.  This is also responsible for
 335  * running a quotacheck as necessary.  We are guaranteed that the superblock
 336  * is consistently read in at this point.
 337  *
 338  * If we fail here, the mount will continue with quota turned off. We don't
 339  * need to inidicate success or failure at all.
 340  */
 341 void
 342 xfs_qm_mount_quotas(
 343         xfs_mount_t     *mp)
 344 {
 345         int             error = 0;
 346         uint            sbf;
 347
 348         /*
 349          * If quotas on realtime volumes is not supported, we disable
 350          * quotas immediately.
 351          */
 352         if (mp->m_sb.sb_rextents) {
 353                 cmn_err(CE_NOTE,
 354                         "Cannot turn on quotas for realtime filesystem %s",
 355                         mp->m_fsname);
 356                 mp->m_qflags = 0;
 357                 goto write_changes;
 358         }
 359
 360         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 361
 362         /*
 363          * Allocate the quotainfo structure inside the mount struct, and
 364          * create quotainode(s), and change/rev superblock if necessary.
 365          */
 366         error = xfs_qm_init_quotainfo(mp);
 367         if (error) {
 368                 /*
 369                  * We must turn off quotas.
 370                  */
 371                 ASSERT(mp->m_quotainfo == NULL);
 372                 mp->m_qflags = 0;
 373                 goto write_changes;
 374         }
 375         /*
 376          * If any of the quotas are not consistent, do a quotacheck.
 377          */
 378         if (XFS_QM_NEED_QUOTACHECK(mp)) {
 379                 error = xfs_qm_quotacheck(mp);
 380                 if (error) {
 381                         /* Quotacheck failed and disabled quotas. */
 382                         return;
 383                 }
 384         }
 385         /*
 386          * If one type of quotas is off, then it will lose its
 387          * quotachecked status, since we won't be doing accounting for
 388          * that type anymore.
 389          */
 390         if (!XFS_IS_UQUOTA_ON(mp))
 391                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
 392         if (!(XFS_IS_GQUOTA_ON(mp) || XFS_IS_PQUOTA_ON(mp)))
 393                 mp->m_qflags &= ~XFS_OQUOTA_CHKD;
 394
 395  write_changes:
 396         /*
 397          * We actually don't have to acquire the m_sb_lock at all.
 398          * This can only be called from mount, and that's single threaded. XXX
 399          */
 400         spin_lock(&mp->m_sb_lock);
 401         sbf = mp->m_sb.sb_qflags;
 402         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
 403         spin_unlock(&mp->m_sb_lock);
 404
 405         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
 406                 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
 407                         /*
 408                          * We could only have been turning quotas off.
 409                          * We aren't in very good shape actually because
 410                          * the incore structures are convinced that quotas are
 411                          * off, but the on disk superblock doesn't know that !
 412                          */
 413                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
 414                         xfs_fs_cmn_err(CE_ALERT, mp,
 415                                 "XFS mount_quotas: Superblock update failed!");
 416                 }
 417         }
 418
 419         if (error) {
 420                 xfs_fs_cmn_err(CE_WARN, mp,
 421                         "Failed to initialize disk quotas.");
 422                 return;
 423         }
 424
 425 #ifdef QUOTADEBUG
 426         if (XFS_IS_QUOTA_ON(mp))
 427                 xfs_qm_internalqcheck(mp);
 428 #endif
 429 }
 430
 431 /*
 432  * Called from the vfsops layer.
 433  */
 434 void
 435 xfs_qm_unmount_quotas(
 436         xfs_mount_t     *mp)
 437 {
 438         /*
 439          * Release the dquots that root inode, et al might be holding,
 440          * before we flush quotas and blow away the quotainfo structure.
 441          */
 442         ASSERT(mp->m_rootip);
 443         xfs_qm_dqdetach(mp->m_rootip);
 444         if (mp->m_rbmip)
 445                 xfs_qm_dqdetach(mp->m_rbmip);
 446         if (mp->m_rsumip)
 447                 xfs_qm_dqdetach(mp->m_rsumip);
 448
 449         /*
 450          * Release the quota inodes.
 451          */
 452         if (mp->m_quotainfo) {
 453                 if (mp->m_quotainfo->qi_uquotaip) {
 454                         IRELE(mp->m_quotainfo->qi_uquotaip);
 455                         mp->m_quotainfo->qi_uquotaip = NULL;
 456                 }
 457                 if (mp->m_quotainfo->qi_gquotaip) {
 458                         IRELE(mp->m_quotainfo->qi_gquotaip);
 459                         mp->m_quotainfo->qi_gquotaip = NULL;
 460                 }
 461         }
 462 }
 463
 464 /*
 465  * Flush all dquots of the given file system to disk. The dquots are
 466  * _not_ purged from memory here, just their data written to disk.
 467  */
 468 STATIC int
 469 xfs_qm_dqflush_all(
 470         struct xfs_mount        *mp,
 471         int                     sync_mode)
 472 {
 473         struct xfs_quotainfo    *q = mp->m_quotainfo;
 474         int                     recl;
 475         struct xfs_dquot        *dqp;
 476         int                     niters;
 477         int                     error;
 478
 479         if (!q)
 480                 return 0;
 481         niters = 0;
 482 again:
 483         mutex_lock(&q->qi_dqlist_lock);
 484         list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
 485                 xfs_dqlock(dqp);
 486                 if (! XFS_DQ_IS_DIRTY(dqp)) {
 487                         xfs_dqunlock(dqp);
 488                         continue;
 489                 }
 490
 491                 /* XXX a sentinel would be better */
 492                 recl = q->qi_dqreclaims;
 493                 if (!xfs_dqflock_nowait(dqp)) {
 494                         /*
 495                          * If we can't grab the flush lock then check
 496                          * to see if the dquot has been flushed delayed
 497                          * write.  If so, grab its buffer and send it
 498                          * out immediately.  We'll be able to acquire
 499                          * the flush lock when the I/O completes.
 500                          */
 501                         xfs_qm_dqflock_pushbuf_wait(dqp);
 502                 }
 503                 /*
 504                  * Let go of the mplist lock. We don't want to hold it
 505                  * across a disk write.
 506                  */
 507                 mutex_unlock(&q->qi_dqlist_lock);
 508                 error = xfs_qm_dqflush(dqp, sync_mode);
 509                 xfs_dqunlock(dqp);
 510                 if (error)
 511                         return error;
 512
 513                 mutex_lock(&q->qi_dqlist_lock);
 514                 if (recl != q->qi_dqreclaims) {
 515                         mutex_unlock(&q->qi_dqlist_lock);
 516                         /* XXX restart limit */
 517                         goto again;
 518                 }
 519         }
 520
 521         mutex_unlock(&q->qi_dqlist_lock);
 522         /* return ! busy */
 523         return 0;
 524 }
 525 /*
 526  * Release the group dquot pointers the user dquots may be
 527  * carrying around as a hint. mplist is locked on entry and exit.
 528  */
 529 STATIC void
 530 xfs_qm_detach_gdquots(
 531         struct xfs_mount        *mp)
 532 {
 533         struct xfs_quotainfo    *q = mp->m_quotainfo;
 534         struct xfs_dquot        *dqp, *gdqp;
 535         int                     nrecl;
 536
 537  again:
 538         ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
 539         list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
 540                 xfs_dqlock(dqp);
 541                 if ((gdqp = dqp->q_gdquot)) {
 542                         xfs_dqlock(gdqp);
 543                         dqp->q_gdquot = NULL;
 544                 }
 545                 xfs_dqunlock(dqp);
 546
 547                 if (gdqp) {
 548                         /*
 549                          * Can't hold the mplist lock across a dqput.
 550                          * XXXmust convert to marker based iterations here.
 551                          */
 552                         nrecl = q->qi_dqreclaims;
 553                         mutex_unlock(&q->qi_dqlist_lock);
 554                         xfs_qm_dqput(gdqp);
 555
 556                         mutex_lock(&q->qi_dqlist_lock);
 557                         if (nrecl != q->qi_dqreclaims)
 558                                 goto again;
 559                 }
 560         }
 561 }
 562
 563 /*
 564  * Go through all the incore dquots of this file system and take them
 565  * off the mplist and hashlist, if the dquot type matches the dqtype
 566  * parameter. This is used when turning off quota accounting for
 567  * users and/or groups, as well as when the filesystem is unmounting.
 568  */
 569 STATIC int
 570 xfs_qm_dqpurge_int(
 571         struct xfs_mount        *mp,
 572         uint                    flags)
 573 {
 574         struct xfs_quotainfo    *q = mp->m_quotainfo;
 575         struct xfs_dquot        *dqp, *n;
 576         uint                    dqtype;
 577         int                     nrecl;
 578         int                     nmisses;
 579
 580         if (!q)
 581                 return 0;
 582
 583         dqtype = (flags & XFS_QMOPT_UQUOTA) ? XFS_DQ_USER : 0;
 584         dqtype |= (flags & XFS_QMOPT_PQUOTA) ? XFS_DQ_PROJ : 0;
 585         dqtype |= (flags & XFS_QMOPT_GQUOTA) ? XFS_DQ_GROUP : 0;
 586
 587         mutex_lock(&q->qi_dqlist_lock);
 588
 589         /*
 590          * In the first pass through all incore dquots of this filesystem,
 591          * we release the group dquot pointers the user dquots may be
 592          * carrying around as a hint. We need to do this irrespective of
 593          * what's being turned off.
 594          */
 595         xfs_qm_detach_gdquots(mp);
 596
 597       again:
 598         nmisses = 0;
 599         ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
 600         /*
 601          * Try to get rid of all of the unwanted dquots. The idea is to
 602          * get them off mplist and hashlist, but leave them on freelist.
 603          */
 604         list_for_each_entry_safe(dqp, n, &q->qi_dqlist, q_mplist) {
 605                 /*
 606                  * It's OK to look at the type without taking dqlock here.
 607                  * We're holding the mplist lock here, and that's needed for
 608                  * a dqreclaim.
 609                  */
 610                 if ((dqp->dq_flags & dqtype) == 0)
 611                         continue;
 612
 613                 if (!mutex_trylock(&dqp->q_hash->qh_lock)) {
 614                         nrecl = q->qi_dqreclaims;
 615                         mutex_unlock(&q->qi_dqlist_lock);
 616                         mutex_lock(&dqp->q_hash->qh_lock);
 617                         mutex_lock(&q->qi_dqlist_lock);
 618
 619                         /*
 620                          * XXXTheoretically, we can get into a very long
 621                          * ping pong game here.
 622                          * No one can be adding dquots to the mplist at
 623                          * this point, but somebody might be taking things off.
 624                          */
 625                         if (nrecl != q->qi_dqreclaims) {
 626                                 mutex_unlock(&dqp->q_hash->qh_lock);
 627                                 goto again;
 628                         }
 629                 }
 630
 631                 /*
 632                  * Take the dquot off the mplist and hashlist. It may remain on
 633                  * freelist in INACTIVE state.
 634                  */
 635                 nmisses += xfs_qm_dqpurge(dqp);
 636         }
 637         mutex_unlock(&q->qi_dqlist_lock);
 638         return nmisses;
 639 }
 640
 641 int
 642 xfs_qm_dqpurge_all(
 643         xfs_mount_t     *mp,
 644         uint            flags)
 645 {
 646         int             ndquots;
 647
 648         /*
 649          * Purge the dquot cache.
 650          * None of the dquots should really be busy at this point.
 651          */
 652         if (mp->m_quotainfo) {
 653                 while ((ndquots = xfs_qm_dqpurge_int(mp, flags))) {
 654                         delay(ndquots * 10);
 655                 }
 656         }
 657         return 0;
 658 }
 659
 660 STATIC int
 661 xfs_qm_dqattach_one(
 662         xfs_inode_t     *ip,
 663         xfs_dqid_t      id,
 664         uint            type,
 665         uint            doalloc,
 666         xfs_dquot_t     *udqhint, /* hint */
 667         xfs_dquot_t     **IO_idqpp)
 668 {
 669         xfs_dquot_t     *dqp;
 670         int             error;
 671
 672         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 673         error = 0;
 674
 675         /*
 676          * See if we already have it in the inode itself. IO_idqpp is
 677          * &i_udquot or &i_gdquot. This made the code look weird, but
 678          * made the logic a lot simpler.
 679          */
 680         dqp = *IO_idqpp;
 681         if (dqp) {
 682                 trace_xfs_dqattach_found(dqp);
 683                 return 0;
 684         }
 685
 686         /*
 687          * udqhint is the i_udquot field in inode, and is non-NULL only
 688          * when the type arg is group/project. Its purpose is to save a
 689          * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
 690          * the user dquot.
 691          */
 692         if (udqhint) {
 693                 ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 694                 xfs_dqlock(udqhint);
 695
 696                 /*
 697                  * No need to take dqlock to look at the id.
 698                  *
 699                  * The ID can't change until it gets reclaimed, and it won't
 700                  * be reclaimed as long as we have a ref from inode and we
 701                  * hold the ilock.
 702                  */
 703                 dqp = udqhint->q_gdquot;
 704                 if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
 705                         xfs_dqlock(dqp);
 706                         XFS_DQHOLD(dqp);
 707                         ASSERT(*IO_idqpp == NULL);
 708                         *IO_idqpp = dqp;
 709
 710                         xfs_dqunlock(dqp);
 711                         xfs_dqunlock(udqhint);
 712                         return 0;
 713                 }
 714
 715                 /*
 716                  * We can't hold a dquot lock when we call the dqget code.
 717                  * We'll deadlock in no time, because of (not conforming to)
 718                  * lock ordering - the inodelock comes before any dquot lock,
 719                  * and we may drop and reacquire the ilock in xfs_qm_dqget().
 720                  */
 721                 xfs_dqunlock(udqhint);
 722         }
 723
 724         /*
 725          * Find the dquot from somewhere. This bumps the
 726          * reference count of dquot and returns it locked.
 727          * This can return ENOENT if dquot didn't exist on
 728          * disk and we didn't ask it to allocate;
 729          * ESRCH if quotas got turned off suddenly.
 730          */
 731         error = xfs_qm_dqget(ip->i_mount, ip, id, type, XFS_QMOPT_DOWARN, &dqp);
 732         if (error)
 733                 return error;
 734
 735         trace_xfs_dqattach_get(dqp);
 736
 737         /*
 738          * dqget may have dropped and re-acquired the ilock, but it guarantees
 739          * that the dquot returned is the one that should go in the inode.
 740          */
 741         *IO_idqpp = dqp;
 742         xfs_dqunlock(dqp);
 743         return 0;
 744 }
 745
 746
 747 /*
 748  * Given a udquot and gdquot, attach a ptr to the group dquot in the
 749  * udquot as a hint for future lookups. The idea sounds simple, but the
 750  * execution isn't, because the udquot might have a group dquot attached
 751  * already and getting rid of that gets us into lock ordering constraints.
 752  * The process is complicated more by the fact that the dquots may or may not
 753  * be locked on entry.
 754  */
 755 STATIC void
 756 xfs_qm_dqattach_grouphint(
 757         xfs_dquot_t     *udq,
 758         xfs_dquot_t     *gdq)
 759 {
 760         xfs_dquot_t     *tmp;
 761
 762         xfs_dqlock(udq);
 763
 764         if ((tmp = udq->q_gdquot)) {
 765                 if (tmp == gdq) {
 766                         xfs_dqunlock(udq);
 767                         return;
 768                 }
 769
 770                 udq->q_gdquot = NULL;
 771                 /*
 772                  * We can't keep any dqlocks when calling dqrele,
 773                  * because the freelist lock comes before dqlocks.
 774                  */
 775                 xfs_dqunlock(udq);
 776                 /*
 777                  * we took a hard reference once upon a time in dqget,
 778                  * so give it back when the udquot no longer points at it
 779                  * dqput() does the unlocking of the dquot.
 780                  */
 781                 xfs_qm_dqrele(tmp);
 782
 783                 xfs_dqlock(udq);
 784                 xfs_dqlock(gdq);
 785
 786         } else {
 787                 ASSERT(XFS_DQ_IS_LOCKED(udq));
 788                 xfs_dqlock(gdq);
 789         }
 790
 791         ASSERT(XFS_DQ_IS_LOCKED(udq));
 792         ASSERT(XFS_DQ_IS_LOCKED(gdq));
 793         /*
 794          * Somebody could have attached a gdquot here,
 795          * when we dropped the uqlock. If so, just do nothing.
 796          */
 797         if (udq->q_gdquot == NULL) {
 798                 XFS_DQHOLD(gdq);
 799                 udq->q_gdquot = gdq;
 800         }
 801
 802         xfs_dqunlock(gdq);
 803         xfs_dqunlock(udq);
 804 }
 805
 806
 807 /*
 808  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 809  * into account.
 810  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 811  * Inode may get unlocked and relocked in here, and the caller must deal with
 812  * the consequences.
 813  */
 814 int
 815 xfs_qm_dqattach_locked(
 816         xfs_inode_t     *ip,
 817         uint            flags)
 818 {
 819         xfs_mount_t     *mp = ip->i_mount;
 820         uint            nquotas = 0;
 821         int             error = 0;
 822
 823         if (!XFS_IS_QUOTA_RUNNING(mp) ||
 824             !XFS_IS_QUOTA_ON(mp) ||
 825             !XFS_NOT_DQATTACHED(mp, ip) ||
 826             ip->i_ino == mp->m_sb.sb_uquotino ||
 827             ip->i_ino == mp->m_sb.sb_gquotino)
 828                 return 0;
 829
 830         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 831
 832         if (XFS_IS_UQUOTA_ON(mp)) {
 833                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 834                                                 flags & XFS_QMOPT_DQALLOC,
 835                                                 NULL, &ip->i_udquot);
 836                 if (error)
 837                         goto done;
 838                 nquotas++;
 839         }
 840
 841         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 842         if (XFS_IS_OQUOTA_ON(mp)) {
 843                 error = XFS_IS_GQUOTA_ON(mp) ?
 844                         xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 845                                                 flags & XFS_QMOPT_DQALLOC,
 846                                                 ip->i_udquot, &ip->i_gdquot) :
 847                         xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
 848                                                 flags & XFS_QMOPT_DQALLOC,
 849                                                 ip->i_udquot, &ip->i_gdquot);
 850                 /*
 851                  * Don't worry about the udquot that we may have
 852                  * attached above. It'll get detached, if not already.
 853                  */
 854                 if (error)
 855                         goto done;
 856                 nquotas++;
 857         }
 858
 859         /*
 860          * Attach this group quota to the user quota as a hint.
 861          * This WON'T, in general, result in a thrash.
 862          */
 863         if (nquotas == 2) {
 864                 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 865                 ASSERT(ip->i_udquot);
 866                 ASSERT(ip->i_gdquot);
 867
 868                 /*
 869                  * We may or may not have the i_udquot locked at this point,
 870                  * but this check is OK since we don't depend on the i_gdquot to
 871                  * be accurate 100% all the time. It is just a hint, and this
 872                  * will succeed in general.
 873                  */
 874                 if (ip->i_udquot->q_gdquot == ip->i_gdquot)
 875                         goto done;
 876                 /*
 877                  * Attach i_gdquot to the gdquot hint inside the i_udquot.
 878                  */
 879                 xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
 880         }
 881
 882  done:
 883 #ifdef QUOTADEBUG
 884         if (! error) {
 885                 if (XFS_IS_UQUOTA_ON(mp))
 886                         ASSERT(ip->i_udquot);
 887                 if (XFS_IS_OQUOTA_ON(mp))
 888                         ASSERT(ip->i_gdquot);
 889         }
 890         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 891 #endif
 892         return error;
 893 }
 894
 895 int
 896 xfs_qm_dqattach(
 897         struct xfs_inode        *ip,
 898         uint                    flags)
 899 {
 900         int                     error;
 901
 902         xfs_ilock(ip, XFS_ILOCK_EXCL);
 903         error = xfs_qm_dqattach_locked(ip, flags);
 904         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 905
 906         return error;
 907 }
 908
 909 /*
 910  * Release dquots (and their references) if any.
 911  * The inode should be locked EXCL except when this's called by
 912  * xfs_ireclaim.
 913  */
 914 void
 915 xfs_qm_dqdetach(
 916         xfs_inode_t     *ip)
 917 {
 918         if (!(ip->i_udquot || ip->i_gdquot))
 919                 return;
 920
 921         trace_xfs_dquot_dqdetach(ip);
 922
 923         ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
 924         ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
 925         if (ip->i_udquot) {
 926                 xfs_qm_dqrele(ip->i_udquot);
 927                 ip->i_udquot = NULL;
 928         }
 929         if (ip->i_gdquot) {
 930                 xfs_qm_dqrele(ip->i_gdquot);
 931                 ip->i_gdquot = NULL;
 932         }
 933 }
 934
 935 int
 936 xfs_qm_sync(
 937         struct xfs_mount        *mp,
 938         int                     flags)
 939 {
 940         struct xfs_quotainfo    *q = mp->m_quotainfo;
 941         int                     recl, restarts;
 942         struct xfs_dquot        *dqp;
 943         int                     error;
 944
 945         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
 946                 return 0;
 947
 948         restarts = 0;
 949
 950   again:
 951         mutex_lock(&q->qi_dqlist_lock);
 952         /*
 953          * dqpurge_all() also takes the mplist lock and iterate thru all dquots
 954          * in quotaoff. However, if the QUOTA_ACTIVE bits are not cleared
 955          * when we have the mplist lock, we know that dquots will be consistent
 956          * as long as we have it locked.
 957          */
 958         if (!XFS_IS_QUOTA_ON(mp)) {
 959                 mutex_unlock(&q->qi_dqlist_lock);
 960                 return 0;
 961         }
 962         ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
 963         list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
 964                 /*
 965                  * If this is vfs_sync calling, then skip the dquots that
 966                  * don't 'seem' to be dirty. ie. don't acquire dqlock.
 967                  * This is very similar to what xfs_sync does with inodes.
 968                  */
 969                 if (flags & SYNC_TRYLOCK) {
 970                         if (!XFS_DQ_IS_DIRTY(dqp))
 971                                 continue;
 972                         if (!xfs_qm_dqlock_nowait(dqp))
 973                                 continue;
 974                 } else {
 975                         xfs_dqlock(dqp);
 976                 }
 977
 978                 /*
 979                  * Now, find out for sure if this dquot is dirty or not.
 980                  */
 981                 if (! XFS_DQ_IS_DIRTY(dqp)) {
 982                         xfs_dqunlock(dqp);
 983                         continue;
 984                 }
 985
 986                 /* XXX a sentinel would be better */
 987                 recl = q->qi_dqreclaims;
 988                 if (!xfs_dqflock_nowait(dqp)) {
 989                         if (flags & SYNC_TRYLOCK) {
 990                                 xfs_dqunlock(dqp);
 991                                 continue;
 992                         }
 993                         /*
 994                          * If we can't grab the flush lock then if the caller
 995                          * really wanted us to give this our best shot, so
 996                          * see if we can give a push to the buffer before we wait
 997                          * on the flush lock. At this point, we know that
 998                          * even though the dquot is being flushed,
 999                          * it has (new) dirty data.
1000                          */
1001                         xfs_qm_dqflock_pushbuf_wait(dqp);
1002                 }
1003                 /*
1004                  * Let go of the mplist lock. We don't want to hold it
1005                  * across a disk write
1006                  */
1007                 mutex_unlock(&q->qi_dqlist_lock);
1008                 error = xfs_qm_dqflush(dqp, flags);
1009                 xfs_dqunlock(dqp);
1010                 if (error && XFS_FORCED_SHUTDOWN(mp))
1011                         return 0;       /* Need to prevent umount failure */
1012                 else if (error)
1013                         return error;
1014
1015                 mutex_lock(&q->qi_dqlist_lock);
1016                 if (recl != q->qi_dqreclaims) {
1017                         if (++restarts >= XFS_QM_SYNC_MAX_RESTARTS)
1018                                 break;
1019
1020                         mutex_unlock(&q->qi_dqlist_lock);
1021                         goto again;
1022                 }
1023         }
1024
1025         mutex_unlock(&q->qi_dqlist_lock);
1026         return 0;
1027 }
1028
1029 /*
1030  * The hash chains and the mplist use the same xfs_dqhash structure as
1031  * their list head, but we can take the mplist qh_lock and one of the
1032  * hash qh_locks at the same time without any problem as they aren't
1033  * related.
1034  */
1035 static struct lock_class_key xfs_quota_mplist_class;
1036
1037 /*
1038  * This initializes all the quota information that's kept in the
1039  * mount structure
1040  */
1041 STATIC int
1042 xfs_qm_init_quotainfo(
1043         xfs_mount_t     *mp)
1044 {
1045         xfs_quotainfo_t *qinf;
1046         int             error;
1047         xfs_dquot_t     *dqp;
1048
1049         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1050
1051         /*
1052          * Tell XQM that we exist as soon as possible.
1053          */
1054         if ((error = xfs_qm_hold_quotafs_ref(mp))) {
1055                 return error;
1056         }
1057
1058         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
1059
1060         /*
1061          * See if quotainodes are setup, and if not, allocate them,
1062          * and change the superblock accordingly.
1063          */
1064         if ((error = xfs_qm_init_quotainos(mp))) {
1065                 kmem_free(qinf);
1066                 mp->m_quotainfo = NULL;
1067                 return error;
1068         }
1069
1070         INIT_LIST_HEAD(&qinf->qi_dqlist);
1071         mutex_init(&qinf->qi_dqlist_lock);
1072         lockdep_set_class(&qinf->qi_dqlist_lock, &xfs_quota_mplist_class);
1073
1074         qinf->qi_dqreclaims = 0;
1075
1076         /* mutex used to serialize quotaoffs */
1077         mutex_init(&qinf->qi_quotaofflock);
1078
1079         /* Precalc some constants */
1080         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
1081         ASSERT(qinf->qi_dqchunklen);
1082         qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
1083         do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
1084
1085         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
1086
1087         /*
1088          * We try to get the limits from the superuser's limits fields.
1089          * This is quite hacky, but it is standard quota practice.
1090          * We look at the USR dquot with id == 0 first, but if user quotas
1091          * are not enabled we goto the GRP dquot with id == 0.
1092          * We don't really care to keep separate default limits for user
1093          * and group quotas, at least not at this point.
1094          */
1095         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)0,
1096                              XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
1097                              (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
1098                                 XFS_DQ_PROJ),
1099                              XFS_QMOPT_DQSUSER|XFS_QMOPT_DOWARN,
1100                              &dqp);
1101         if (! error) {
1102                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
1103
1104                 /*
1105                  * The warnings and timers set the grace period given to
1106                  * a user or group before he or she can not perform any
1107                  * more writing. If it is zero, a default is used.
1108                  */
1109                 qinf->qi_btimelimit = ddqp->d_btimer ?
1110                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
1111                 qinf->qi_itimelimit = ddqp->d_itimer ?
1112                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
1113                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
1114                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
1115                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
1116                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
1117                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
1118                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
1119                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
1120                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
1121                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
1122                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
1123                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
1124                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
1125                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
1126                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
1127
1128                 /*
1129                  * We sent the XFS_QMOPT_DQSUSER flag to dqget because
1130                  * we don't want this dquot cached. We haven't done a
1131                  * quotacheck yet, and quotacheck doesn't like incore dquots.
1132                  */
1133                 xfs_qm_dqdestroy(dqp);
1134         } else {
1135                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
1136                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
1137                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
1138                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
1139                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
1140                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
1141         }
1142
1143         return 0;
1144 }
1145
1146
1147 /*
1148  * Gets called when unmounting a filesystem or when all quotas get
1149  * turned off.
1150  * This purges the quota inodes, destroys locks and frees itself.
1151  */
1152 void
1153 xfs_qm_destroy_quotainfo(
1154         xfs_mount_t     *mp)
1155 {
1156         xfs_quotainfo_t *qi;
1157
1158         qi = mp->m_quotainfo;
1159         ASSERT(qi != NULL);
1160         ASSERT(xfs_Gqm != NULL);
1161
1162         /*
1163          * Release the reference that XQM kept, so that we know
1164          * when the XQM structure should be freed. We cannot assume
1165          * that xfs_Gqm is non-null after this point.
1166          */
1167         xfs_qm_rele_quotafs_ref(mp);
1168
1169         ASSERT(list_empty(&qi->qi_dqlist));
1170         mutex_destroy(&qi->qi_dqlist_lock);
1171
1172         if (qi->qi_uquotaip) {
1173                 IRELE(qi->qi_uquotaip);
1174                 qi->qi_uquotaip = NULL; /* paranoia */
1175         }
1176         if (qi->qi_gquotaip) {
1177                 IRELE(qi->qi_gquotaip);
1178                 qi->qi_gquotaip = NULL;
1179         }
1180         mutex_destroy(&qi->qi_quotaofflock);
1181         kmem_free(qi);
1182         mp->m_quotainfo = NULL;
1183 }
1184
1185
1186
1187 /* ------------------- PRIVATE STATIC FUNCTIONS ----------------------- */
1188
1189 /* ARGSUSED */
1190 STATIC void
1191 xfs_qm_list_init(
1192         xfs_dqlist_t    *list,
1193         char            *str,
1194         int             n)
1195 {
1196         mutex_init(&list->qh_lock);
1197         INIT_LIST_HEAD(&list->qh_list);
1198         list->qh_version = 0;
1199         list->qh_nelems = 0;
1200 }
1201
1202 STATIC void
1203 xfs_qm_list_destroy(
1204         xfs_dqlist_t    *list)
1205 {
1206         mutex_destroy(&(list->qh_lock));
1207 }
1208
1209
1210 /*
1211  * Stripped down version of dqattach. This doesn't attach, or even look at the
1212  * dquots attached to the inode. The rationale is that there won't be any
1213  * attached at the time this is called from quotacheck.
1214  */
1215 STATIC int
1216 xfs_qm_dqget_noattach(
1217         xfs_inode_t     *ip,
1218         xfs_dquot_t     **O_udqpp,
1219         xfs_dquot_t     **O_gdqpp)
1220 {
1221         int             error;
1222         xfs_mount_t     *mp;
1223         xfs_dquot_t     *udqp, *gdqp;
1224
1225         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1226         mp = ip->i_mount;
1227         udqp = NULL;
1228         gdqp = NULL;
1229
1230         if (XFS_IS_UQUOTA_ON(mp)) {
1231                 ASSERT(ip->i_udquot == NULL);
1232                 /*
1233                  * We want the dquot allocated if it doesn't exist.
1234                  */
1235                 if ((error = xfs_qm_dqget(mp, ip, ip->i_d.di_uid, XFS_DQ_USER,
1236                                          XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN,
1237                                          &udqp))) {
1238                         /*
1239                          * Shouldn't be able to turn off quotas here.
1240                          */
1241                         ASSERT(error != ESRCH);
1242                         ASSERT(error != ENOENT);
1243                         return error;
1244                 }
1245                 ASSERT(udqp);
1246         }
1247
1248         if (XFS_IS_OQUOTA_ON(mp)) {
1249                 ASSERT(ip->i_gdquot == NULL);
1250                 if (udqp)
1251                         xfs_dqunlock(udqp);
1252                 error = XFS_IS_GQUOTA_ON(mp) ?
1253                                 xfs_qm_dqget(mp, ip,
1254                                              ip->i_d.di_gid, XFS_DQ_GROUP,
1255                                              XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
1256                                              &gdqp) :
1257                                 xfs_qm_dqget(mp, ip,
1258                                              ip->i_d.di_projid, XFS_DQ_PROJ,
1259                                              XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
1260                                              &gdqp);
1261                 if (error) {
1262                         if (udqp)
1263                                 xfs_qm_dqrele(udqp);
1264                         ASSERT(error != ESRCH);
1265                         ASSERT(error != ENOENT);
1266                         return error;
1267                 }
1268                 ASSERT(gdqp);
1269
1270                 /* Reacquire the locks in the right order */
1271                 if (udqp) {
1272                         if (! xfs_qm_dqlock_nowait(udqp)) {
1273                                 xfs_dqunlock(gdqp);
1274                                 xfs_dqlock(udqp);
1275                                 xfs_dqlock(gdqp);
1276                         }
1277                 }
1278         }
1279
1280         *O_udqpp = udqp;
1281         *O_gdqpp = gdqp;
1282
1283 #ifdef QUOTADEBUG
1284         if (udqp) ASSERT(XFS_DQ_IS_LOCKED(udqp));
1285         if (gdqp) ASSERT(XFS_DQ_IS_LOCKED(gdqp));
1286 #endif
1287         return 0;
1288 }
1289
1290 /*
1291  * Create an inode and return with a reference already taken, but unlocked
1292  * This is how we create quota inodes
1293  */
1294 STATIC int
1295 xfs_qm_qino_alloc(
1296         xfs_mount_t     *mp,
1297         xfs_inode_t     **ip,
1298         __int64_t       sbfields,
1299         uint            flags)
1300 {
1301         xfs_trans_t     *tp;
1302         int             error;
1303         int             committed;
1304
1305         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
1306         if ((error = xfs_trans_reserve(tp,
1307                                       XFS_QM_QINOCREATE_SPACE_RES(mp),
1308                                       XFS_CREATE_LOG_RES(mp), 0,
1309                                       XFS_TRANS_PERM_LOG_RES,
1310                                       XFS_CREATE_LOG_COUNT))) {
1311                 xfs_trans_cancel(tp, 0);
1312                 return error;
1313         }
1314
1315         if ((error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0,
1316                                    &xfs_zerocr, 0, 1, ip, &committed))) {
1317                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
1318                                  XFS_TRANS_ABORT);
1319                 return error;
1320         }
1321
1322         /*
1323          * Keep an extra reference to this quota inode. This inode is
1324          * locked exclusively and joined to the transaction already.
1325          */
1326         ASSERT(xfs_isilocked(*ip, XFS_ILOCK_EXCL));
1327         IHOLD(*ip);
1328
1329         /*
1330          * Make the changes in the superblock, and log those too.
1331          * sbfields arg may contain fields other than *QUOTINO;
1332          * VERSIONNUM for example.
1333          */
1334         spin_lock(&mp->m_sb_lock);
1335         if (flags & XFS_QMOPT_SBVERSION) {
1336                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
1337                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1338                                    XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
1339                        (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1340                         XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
1341
1342                 xfs_sb_version_addquota(&mp->m_sb);
1343                 mp->m_sb.sb_uquotino = NULLFSINO;
1344                 mp->m_sb.sb_gquotino = NULLFSINO;
1345
1346                 /* qflags will get updated _after_ quotacheck */
1347                 mp->m_sb.sb_qflags = 0;
1348         }
1349         if (flags & XFS_QMOPT_UQUOTA)
1350                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
1351         else
1352                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
1353         spin_unlock(&mp->m_sb_lock);
1354         xfs_mod_sb(tp, sbfields);
1355
1356         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
1357                 xfs_fs_cmn_err(CE_ALERT, mp, "XFS qino_alloc failed!");
1358                 return error;
1359         }
1360         return 0;
1361 }
1362
1363
1364 STATIC void
1365 xfs_qm_reset_dqcounts(
1366         xfs_mount_t     *mp,
1367         xfs_buf_t       *bp,
1368         xfs_dqid_t      id,
1369         uint            type)
1370 {
1371         xfs_disk_dquot_t        *ddq;
1372         int                     j;
1373
1374         trace_xfs_reset_dqcounts(bp, _RET_IP_);
1375
1376         /*
1377          * Reset all counters and timers. They'll be
1378          * started afresh by xfs_qm_quotacheck.
1379          */
1380 #ifdef DEBUG
1381         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
1382         do_div(j, sizeof(xfs_dqblk_t));
1383         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
1384 #endif
1385         ddq = (xfs_disk_dquot_t *)XFS_BUF_PTR(bp);
1386         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
1387                 /*
1388                  * Do a sanity check, and if needed, repair the dqblk. Don't
1389                  * output any warnings because it's perfectly possible to
1390                  * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
1391                  */
1392                 (void) xfs_qm_dqcheck(ddq, id+j, type, XFS_QMOPT_DQREPAIR,
1393                                       "xfs_quotacheck");
1394                 ddq->d_bcount = 0;
1395                 ddq->d_icount = 0;
1396                 ddq->d_rtbcount = 0;
1397                 ddq->d_btimer = 0;
1398                 ddq->d_itimer = 0;
1399                 ddq->d_rtbtimer = 0;
1400                 ddq->d_bwarns = 0;
1401                 ddq->d_iwarns = 0;
1402                 ddq->d_rtbwarns = 0;
1403                 ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
1404         }
1405 }
1406
1407 STATIC int
1408 xfs_qm_dqiter_bufs(
1409         xfs_mount_t     *mp,
1410         xfs_dqid_t      firstid,
1411         xfs_fsblock_t   bno,
1412         xfs_filblks_t   blkcnt,
1413         uint            flags)
1414 {
1415         xfs_buf_t       *bp;
1416         int             error;
1417         int             notcommitted;
1418         int             incr;
1419         int             type;
1420
1421         ASSERT(blkcnt > 0);
1422         notcommitted = 0;
1423         incr = (blkcnt > XFS_QM_MAX_DQCLUSTER_LOGSZ) ?
1424                 XFS_QM_MAX_DQCLUSTER_LOGSZ : blkcnt;
1425         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
1426                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
1427         error = 0;
1428
1429         /*
1430          * Blkcnt arg can be a very big number, and might even be
1431          * larger than the log itself. So, we have to break it up into
1432          * manageable-sized transactions.
1433          * Note that we don't start a permanent transaction here; we might
1434          * not be able to get a log reservation for the whole thing up front,
1435          * and we don't really care to either, because we just discard
1436          * everything if we were to crash in the middle of this loop.
1437          */
1438         while (blkcnt--) {
1439                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
1440                               XFS_FSB_TO_DADDR(mp, bno),
1441                               mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1442                 if (error)
1443                         break;
1444
1445                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
1446                 xfs_bdwrite(mp, bp);
1447                 /*
1448                  * goto the next block.
1449                  */
1450                 bno++;
1451                 firstid += mp->m_quotainfo->qi_dqperchunk;
1452         }
1453         return error;
1454 }
1455
1456 /*
1457  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
1458  * caller supplied function for every chunk of dquots that we find.
1459  */
1460 STATIC int
1461 xfs_qm_dqiterate(
1462         xfs_mount_t     *mp,
1463         xfs_inode_t     *qip,
1464         uint            flags)
1465 {
1466         xfs_bmbt_irec_t         *map;
1467         int                     i, nmaps;       /* number of map entries */
1468         int                     error;          /* return value */
1469         xfs_fileoff_t           lblkno;
1470         xfs_filblks_t           maxlblkcnt;
1471         xfs_dqid_t              firstid;
1472         xfs_fsblock_t           rablkno;
1473         xfs_filblks_t           rablkcnt;
1474
1475         error = 0;
1476         /*
1477          * This looks racy, but we can't keep an inode lock across a
1478          * trans_reserve. But, this gets called during quotacheck, and that
1479          * happens only at mount time which is single threaded.
1480          */
1481         if (qip->i_d.di_nblocks == 0)
1482                 return 0;
1483
1484         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
1485
1486         lblkno = 0;
1487         maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
1488         do {
1489                 nmaps = XFS_DQITER_MAP_SIZE;
1490                 /*
1491                  * We aren't changing the inode itself. Just changing
1492                  * some of its data. No new blocks are added here, and
1493                  * the inode is never added to the transaction.
1494                  */
1495                 xfs_ilock(qip, XFS_ILOCK_SHARED);
1496                 error = xfs_bmapi(NULL, qip, lblkno,
1497                                   maxlblkcnt - lblkno,
1498                                   XFS_BMAPI_METADATA,
1499                                   NULL,
1500                                   0, map, &nmaps, NULL, NULL);
1501                 xfs_iunlock(qip, XFS_ILOCK_SHARED);
1502                 if (error)
1503                         break;
1504
1505                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1506                 for (i = 0; i < nmaps; i++) {
1507                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1508                         ASSERT(map[i].br_blockcount);
1509
1510
1511                         lblkno += map[i].br_blockcount;
1512
1513                         if (map[i].br_startblock == HOLESTARTBLOCK)
1514                                 continue;
1515
1516                         firstid = (xfs_dqid_t) map[i].br_startoff *
1517                                 mp->m_quotainfo->qi_dqperchunk;
1518                         /*
1519                          * Do a read-ahead on the next extent.
1520                          */
1521                         if ((i+1 < nmaps) &&
1522                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1523                                 rablkcnt =  map[i+1].br_blockcount;
1524                                 rablkno = map[i+1].br_startblock;
1525                                 while (rablkcnt--) {
1526                                         xfs_baread(mp->m_ddev_targp,
1527                                                XFS_FSB_TO_DADDR(mp, rablkno),
1528                                                mp->m_quotainfo->qi_dqchunklen);
1529                                         rablkno++;
1530                                 }
1531                         }
1532                         /*
1533                          * Iterate thru all the blks in the extent and
1534                          * reset the counters of all the dquots inside them.
1535                          */
1536                         if ((error = xfs_qm_dqiter_bufs(mp,
1537                                                        firstid,
1538                                                        map[i].br_startblock,
1539                                                        map[i].br_blockcount,
1540                                                        flags))) {
1541                                 break;
1542                         }
1543                 }
1544
1545                 if (error)
1546                         break;
1547         } while (nmaps > 0);
1548
1549         kmem_free(map);
1550
1551         return error;
1552 }
1553
1554 /*
1555  * Called by dqusage_adjust in doing a quotacheck.
1556  * Given the inode, and a dquot (either USR or GRP, doesn't matter),
1557  * this updates its incore copy as well as the buffer copy. This is
1558  * so that once the quotacheck is done, we can just log all the buffers,
1559  * as opposed to logging numerous updates to individual dquots.
1560  */
1561 STATIC void
1562 xfs_qm_quotacheck_dqadjust(
1563         xfs_dquot_t             *dqp,
1564         xfs_qcnt_t              nblks,
1565         xfs_qcnt_t              rtblks)
1566 {
1567         ASSERT(XFS_DQ_IS_LOCKED(dqp));
1568
1569         trace_xfs_dqadjust(dqp);
1570
1571         /*
1572          * Adjust the inode count and the block count to reflect this inode's
1573          * resource usage.
1574          */
1575         be64_add_cpu(&dqp->q_core.d_icount, 1);
1576         dqp->q_res_icount++;
1577         if (nblks) {
1578                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1579                 dqp->q_res_bcount += nblks;
1580         }
1581         if (rtblks) {
1582                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1583                 dqp->q_res_rtbcount += rtblks;
1584         }
1585
1586         /*
1587          * Set default limits, adjust timers (since we changed usages)
1588          *
1589          * There are no timers for the default values set in the root dquot.
1590          */
1591         if (dqp->q_core.d_id) {
1592                 xfs_qm_adjust_dqlimits(dqp->q_mount, &dqp->q_core);
1593                 xfs_qm_adjust_dqtimers(dqp->q_mount, &dqp->q_core);
1594         }
1595
1596         dqp->dq_flags |= XFS_DQ_DIRTY;
1597 }
1598
1599 STATIC int
1600 xfs_qm_get_rtblks(
1601         xfs_inode_t     *ip,
1602         xfs_qcnt_t      *O_rtblks)
1603 {
1604         xfs_filblks_t   rtblks;                 /* total rt blks */
1605         xfs_extnum_t    idx;                    /* extent record index */
1606         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1607         xfs_extnum_t    nextents;               /* number of extent entries */
1608         int             error;
1609
1610         ASSERT(XFS_IS_REALTIME_INODE(ip));
1611         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1612         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1613                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1614                         return error;
1615         }
1616         rtblks = 0;
1617         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1618         for (idx = 0; idx < nextents; idx++)
1619                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1620         *O_rtblks = (xfs_qcnt_t)rtblks;
1621         return 0;
1622 }
1623
1624 /*
1625  * callback routine supplied to bulkstat(). Given an inumber, find its
1626  * dquots and update them to account for resources taken by that inode.
1627  */
1628 /* ARGSUSED */
1629 STATIC int
1630 xfs_qm_dqusage_adjust(
1631         xfs_mount_t     *mp,            /* mount point for filesystem */
1632         xfs_ino_t       ino,            /* inode number to get data for */
1633         void            __user *buffer, /* not used */
1634         int             ubsize,         /* not used */
1635         int             *ubused,        /* not used */
1636         int             *res)           /* result code value */
1637 {
1638         xfs_inode_t     *ip;
1639         xfs_dquot_t     *udqp, *gdqp;
1640         xfs_qcnt_t      nblks, rtblks;
1641         int             error;
1642
1643         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1644
1645         /*
1646          * rootino must have its resources accounted for, not so with the quota
1647          * inodes.
1648          */
1649         if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1650                 *res = BULKSTAT_RV_NOTHING;
1651                 return XFS_ERROR(EINVAL);
1652         }
1653
1654         /*
1655          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1656          * interface expects the inode to be exclusively locked because that's
1657          * the case in all other instances. It's OK that we do this because
1658          * quotacheck is done only at mount time.
1659          */
1660         if ((error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip))) {
1661                 *res = BULKSTAT_RV_NOTHING;
1662                 return error;
1663         }
1664
1665         /*
1666          * Obtain the locked dquots. In case of an error (eg. allocation
1667          * fails for ENOSPC), we return the negative of the error number
1668          * to bulkstat, so that it can get propagated to quotacheck() and
1669          * making us disable quotas for the file system.
1670          */
1671         if ((error = xfs_qm_dqget_noattach(ip, &udqp, &gdqp))) {
1672                 xfs_iput(ip, XFS_ILOCK_EXCL);
1673                 *res = BULKSTAT_RV_GIVEUP;
1674                 return error;
1675         }
1676
1677         rtblks = 0;
1678         if (! XFS_IS_REALTIME_INODE(ip)) {
1679                 nblks = (xfs_qcnt_t)ip->i_d.di_nblocks;
1680         } else {
1681                 /*
1682                  * Walk thru the extent list and count the realtime blocks.
1683                  */
1684                 if ((error = xfs_qm_get_rtblks(ip, &rtblks))) {
1685                         xfs_iput(ip, XFS_ILOCK_EXCL);
1686                         if (udqp)
1687                                 xfs_qm_dqput(udqp);
1688                         if (gdqp)
1689                                 xfs_qm_dqput(gdqp);
1690                         *res = BULKSTAT_RV_GIVEUP;
1691                         return error;
1692                 }
1693                 nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1694         }
1695         ASSERT(ip->i_delayed_blks == 0);
1696
1697         /*
1698          * We can't release the inode while holding its dquot locks.
1699          * The inode can go into inactive and might try to acquire the dquotlocks.
1700          * So, just unlock here and do a vn_rele at the end.
1701          */
1702         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1703
1704         /*
1705          * Add the (disk blocks and inode) resources occupied by this
1706          * inode to its dquots. We do this adjustment in the incore dquot,
1707          * and also copy the changes to its buffer.
1708          * We don't care about putting these changes in a transaction
1709          * envelope because if we crash in the middle of a 'quotacheck'
1710          * we have to start from the beginning anyway.
1711          * Once we're done, we'll log all the dquot bufs.
1712          *
1713          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1714          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1715          */
1716         if (XFS_IS_UQUOTA_ON(mp)) {
1717                 ASSERT(udqp);
1718                 xfs_qm_quotacheck_dqadjust(udqp, nblks, rtblks);
1719                 xfs_qm_dqput(udqp);
1720         }
1721         if (XFS_IS_OQUOTA_ON(mp)) {
1722                 ASSERT(gdqp);
1723                 xfs_qm_quotacheck_dqadjust(gdqp, nblks, rtblks);
1724                 xfs_qm_dqput(gdqp);
1725         }
1726         /*
1727          * Now release the inode. This will send it to 'inactive', and
1728          * possibly even free blocks.
1729          */
1730         IRELE(ip);
1731
1732         /*
1733          * Goto next inode.
1734          */
1735         *res = BULKSTAT_RV_DIDONE;
1736         return 0;
1737 }
1738
1739 /*
1740  * Walk thru all the filesystem inodes and construct a consistent view
1741  * of the disk quota world. If the quotacheck fails, disable quotas.
1742  */
1743 int
1744 xfs_qm_quotacheck(
1745         xfs_mount_t     *mp)
1746 {
1747         int             done, count, error;
1748         xfs_ino_t       lastino;
1749         size_t          structsz;
1750         xfs_inode_t     *uip, *gip;
1751         uint            flags;
1752
1753         count = INT_MAX;
1754         structsz = 1;
1755         lastino = 0;
1756         flags = 0;
1757
1758         ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1759         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1760
1761         /*
1762          * There should be no cached dquots. The (simplistic) quotacheck
1763          * algorithm doesn't like that.
1764          */
1765         ASSERT(list_empty(&mp->m_quotainfo->qi_dqlist));
1766
1767         cmn_err(CE_NOTE, "XFS quotacheck %s: Please wait.", mp->m_fsname);
1768
1769         /*
1770          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1771          * their counters to zero. We need a clean slate.
1772          * We don't log our changes till later.
1773          */
1774         uip = mp->m_quotainfo->qi_uquotaip;
1775         if (uip) {
1776                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA);
1777                 if (error)
1778                         goto error_return;
1779                 flags |= XFS_UQUOTA_CHKD;
1780         }
1781
1782         gip = mp->m_quotainfo->qi_gquotaip;
1783         if (gip) {
1784                 error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1785                                         XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1786                 if (error)
1787                         goto error_return;
1788                 flags |= XFS_OQUOTA_CHKD;
1789         }
1790
1791         do {
1792                 /*
1793                  * Iterate thru all the inodes in the file system,
1794                  * adjusting the corresponding dquot counters in core.
1795                  */
1796                 error = xfs_bulkstat(mp, &lastino, &count,
1797                                      xfs_qm_dqusage_adjust,
1798                                      structsz, NULL, &done);
1799                 if (error)
1800                         break;
1801
1802         } while (!done);
1803
1804         /*
1805          * We've made all the changes that we need to make incore.
1806          * Flush them down to disk buffers if everything was updated
1807          * successfully.
1808          */
1809         if (!error)
1810                 error = xfs_qm_dqflush_all(mp, 0);
1811
1812         /*
1813          * We can get this error if we couldn't do a dquot allocation inside
1814          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1815          * dirty dquots that might be cached, we just want to get rid of them
1816          * and turn quotaoff. The dquots won't be attached to any of the inodes
1817          * at this point (because we intentionally didn't in dqget_noattach).
1818          */
1819         if (error) {
1820                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1821                 goto error_return;
1822         }
1823
1824         /*
1825          * We didn't log anything, because if we crashed, we'll have to
1826          * start the quotacheck from scratch anyway. However, we must make
1827          * sure that our dquot changes are secure before we put the
1828          * quotacheck'd stamp on the superblock. So, here we do a synchronous
1829          * flush.
1830          */
1831         XFS_bflush(mp->m_ddev_targp);
1832
1833         /*
1834          * If one type of quotas is off, then it will lose its
1835          * quotachecked status, since we won't be doing accounting for
1836          * that type anymore.
1837          */
1838         mp->m_qflags &= ~(XFS_OQUOTA_CHKD | XFS_UQUOTA_CHKD);
1839         mp->m_qflags |= flags;
1840
1841         xfs_qm_dquot_list_print(mp);
1842
1843  error_return:
1844         if (error) {
1845                 cmn_err(CE_WARN, "XFS quotacheck %s: Unsuccessful (Error %d): "
1846                         "Disabling quotas.",
1847                         mp->m_fsname, error);
1848                 /*
1849                  * We must turn off quotas.
1850                  */
1851                 ASSERT(mp->m_quotainfo != NULL);
1852                 ASSERT(xfs_Gqm != NULL);
1853                 xfs_qm_destroy_quotainfo(mp);
1854                 if (xfs_mount_reset_sbqflags(mp)) {
1855                         cmn_err(CE_WARN, "XFS quotacheck %s: "
1856                                 "Failed to reset quota flags.", mp->m_fsname);
1857                 }
1858         } else {
1859                 cmn_err(CE_NOTE, "XFS quotacheck %s: Done.", mp->m_fsname);
1860         }
1861         return (error);
1862 }
1863
1864 /*
1865  * This is called after the superblock has been read in and we're ready to
1866  * iget the quota inodes.
1867  */
1868 STATIC int
1869 xfs_qm_init_quotainos(
1870         xfs_mount_t     *mp)
1871 {
1872         xfs_inode_t     *uip, *gip;
1873         int             error;
1874         __int64_t       sbflags;
1875         uint            flags;
1876
1877         ASSERT(mp->m_quotainfo);
1878         uip = gip = NULL;
1879         sbflags = 0;
1880         flags = 0;
1881
1882         /*
1883          * Get the uquota and gquota inodes
1884          */
1885         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1886                 if (XFS_IS_UQUOTA_ON(mp) &&
1887                     mp->m_sb.sb_uquotino != NULLFSINO) {
1888                         ASSERT(mp->m_sb.sb_uquotino > 0);
1889                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1890                                              0, 0, &uip)))
1891                                 return XFS_ERROR(error);
1892                 }
1893                 if (XFS_IS_OQUOTA_ON(mp) &&
1894                     mp->m_sb.sb_gquotino != NULLFSINO) {
1895                         ASSERT(mp->m_sb.sb_gquotino > 0);
1896                         if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1897                                              0, 0, &gip))) {
1898                                 if (uip)
1899                                         IRELE(uip);
1900                                 return XFS_ERROR(error);
1901                         }
1902                 }
1903         } else {
1904                 flags |= XFS_QMOPT_SBVERSION;
1905                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1906                             XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1907         }
1908
1909         /*
1910          * Create the two inodes, if they don't exist already. The changes
1911          * made above will get added to a transaction and logged in one of
1912          * the qino_alloc calls below.  If the device is readonly,
1913          * temporarily switch to read-write to do this.
1914          */
1915         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1916                 if ((error = xfs_qm_qino_alloc(mp, &uip,
1917                                               sbflags | XFS_SB_UQUOTINO,
1918                                               flags | XFS_QMOPT_UQUOTA)))
1919                         return XFS_ERROR(error);
1920
1921                 flags &= ~XFS_QMOPT_SBVERSION;
1922         }
1923         if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1924                 flags |= (XFS_IS_GQUOTA_ON(mp) ?
1925                                 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1926                 error = xfs_qm_qino_alloc(mp, &gip,
1927                                           sbflags | XFS_SB_GQUOTINO, flags);
1928                 if (error) {
1929                         if (uip)
1930                                 IRELE(uip);
1931
1932                         return XFS_ERROR(error);
1933                 }
1934         }
1935
1936         mp->m_quotainfo->qi_uquotaip = uip;
1937         mp->m_quotainfo->qi_gquotaip = gip;
1938
1939         return 0;
1940 }
1941
1942
1943
1944 /*
1945  * Just pop the least recently used dquot off the freelist and
1946  * recycle it. The returned dquot is locked.
1947  */
1948 STATIC xfs_dquot_t *
1949 xfs_qm_dqreclaim_one(void)
1950 {
1951         xfs_dquot_t     *dqpout;
1952         xfs_dquot_t     *dqp;
1953         int             restarts;
1954
1955         restarts = 0;
1956         dqpout = NULL;
1957
1958         /* lockorder: hashchainlock, freelistlock, mplistlock, dqlock, dqflock */
1959 startagain:
1960         mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
1961
1962         list_for_each_entry(dqp, &xfs_Gqm->qm_dqfrlist, q_freelist) {
1963                 struct xfs_mount *mp = dqp->q_mount;
1964                 xfs_dqlock(dqp);
1965
1966                 /*
1967                  * We are racing with dqlookup here. Naturally we don't
1968                  * want to reclaim a dquot that lookup wants. We release the
1969                  * freelist lock and start over, so that lookup will grab
1970                  * both the dquot and the freelistlock.
1971                  */
1972                 if (dqp->dq_flags & XFS_DQ_WANT) {
1973                         ASSERT(! (dqp->dq_flags & XFS_DQ_INACTIVE));
1974
1975                         trace_xfs_dqreclaim_want(dqp);
1976
1977                         xfs_dqunlock(dqp);
1978                         mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
1979                         if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
1980                                 return NULL;
1981                         XQM_STATS_INC(xqmstats.xs_qm_dqwants);
1982                         goto startagain;
1983                 }
1984
1985                 /*
1986                  * If the dquot is inactive, we are assured that it is
1987                  * not on the mplist or the hashlist, and that makes our
1988                  * life easier.
1989                  */
1990                 if (dqp->dq_flags & XFS_DQ_INACTIVE) {
1991                         ASSERT(mp == NULL);
1992                         ASSERT(! XFS_DQ_IS_DIRTY(dqp));
1993                         ASSERT(list_empty(&dqp->q_hashlist));
1994                         ASSERT(list_empty(&dqp->q_mplist));
1995                         list_del_init(&dqp->q_freelist);
1996                         xfs_Gqm->qm_dqfrlist_cnt--;
1997                         xfs_dqunlock(dqp);
1998                         dqpout = dqp;
1999                         XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
2000                         break;
2001                 }
2002
2003                 ASSERT(dqp->q_hash);
2004                 ASSERT(!list_empty(&dqp->q_mplist));
2005
2006                 /*
2007                  * Try to grab the flush lock. If this dquot is in the process of
2008                  * getting flushed to disk, we don't want to reclaim it.
2009                  */
2010                 if (!xfs_dqflock_nowait(dqp)) {
2011                         xfs_dqunlock(dqp);
2012                         continue;
2013                 }
2014
2015                 /*
2016                  * We have the flush lock so we know that this is not in the
2017                  * process of being flushed. So, if this is dirty, flush it
2018                  * DELWRI so that we don't get a freelist infested with
2019                  * dirty dquots.
2020                  */
2021                 if (XFS_DQ_IS_DIRTY(dqp)) {
2022                         int     error;
2023
2024                         trace_xfs_dqreclaim_dirty(dqp);
2025
2026                         /*
2027                          * We flush it delayed write, so don't bother
2028                          * releasing the freelist lock.
2029                          */
2030                         error = xfs_qm_dqflush(dqp, 0);
2031                         if (error) {
2032                                 xfs_fs_cmn_err(CE_WARN, mp,
2033                         "xfs_qm_dqreclaim: dquot %p flush failed", dqp);
2034                         }
2035                         xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
2036                         continue;
2037                 }
2038
2039                 /*
2040                  * We're trying to get the hashlock out of order. This races
2041                  * with dqlookup; so, we giveup and goto the next dquot if
2042                  * we couldn't get the hashlock. This way, we won't starve
2043                  * a dqlookup process that holds the hashlock that is
2044                  * waiting for the freelist lock.
2045                  */
2046                 if (!mutex_trylock(&dqp->q_hash->qh_lock)) {
2047                         restarts++;
2048                         goto dqfunlock;
2049                 }
2050
2051                 /*
2052                  * This races with dquot allocation code as well as dqflush_all
2053                  * and reclaim code. So, if we failed to grab the mplist lock,
2054                  * giveup everything and start over.
2055                  */
2056                 if (!mutex_trylock(&mp->m_quotainfo->qi_dqlist_lock)) {
2057                         restarts++;
2058                         mutex_unlock(&dqp->q_hash->qh_lock);
2059                         xfs_dqfunlock(dqp);
2060                         xfs_dqunlock(dqp);
2061                         mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
2062                         if (restarts++ >= XFS_QM_RECLAIM_MAX_RESTARTS)
2063                                 return NULL;
2064                         goto startagain;
2065                 }
2066
2067                 ASSERT(dqp->q_nrefs == 0);
2068                 list_del_init(&dqp->q_mplist);
2069                 mp->m_quotainfo->qi_dquots--;
2070                 mp->m_quotainfo->qi_dqreclaims++;
2071                 list_del_init(&dqp->q_hashlist);
2072                 dqp->q_hash->qh_version++;
2073                 list_del_init(&dqp->q_freelist);
2074                 xfs_Gqm->qm_dqfrlist_cnt--;
2075                 dqpout = dqp;
2076                 mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
2077                 mutex_unlock(&dqp->q_hash->qh_lock);
2078 dqfunlock:
2079                 xfs_dqfunlock(dqp);
2080                 xfs_dqunlock(dqp);
2081                 if (dqpout)
2082                         break;
2083                 if (restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
2084                         return NULL;
2085         }
2086         mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
2087         return dqpout;
2088 }
2089
2090 /*
2091  * Traverse the freelist of dquots and attempt to reclaim a maximum of
2092  * 'howmany' dquots. This operation races with dqlookup(), and attempts to
2093  * favor the lookup function ...
2094  */
2095 STATIC int
2096 xfs_qm_shake_freelist(
2097         int     howmany)
2098 {
2099         int             nreclaimed = 0;
2100         xfs_dquot_t     *dqp;
2101
2102         if (howmany <= 0)
2103                 return 0;
2104
2105         while (nreclaimed < howmany) {
2106                 dqp = xfs_qm_dqreclaim_one();
2107                 if (!dqp)
2108                         return nreclaimed;
2109                 xfs_qm_dqdestroy(dqp);
2110                 nreclaimed++;
2111         }
2112         return nreclaimed;
2113 }
2114
2115 /*
2116  * The kmem_shake interface is invoked when memory is running low.
2117  */
2118 /* ARGSUSED */
2119 STATIC int
2120 xfs_qm_shake(
2121         struct shrinker *shrink,
2122         int             nr_to_scan,
2123         gfp_t           gfp_mask)
2124 {
2125         int     ndqused, nfree, n;
2126
2127         if (!kmem_shake_allow(gfp_mask))
2128                 return 0;
2129         if (!xfs_Gqm)
2130                 return 0;
2131
2132         nfree = xfs_Gqm->qm_dqfrlist_cnt; /* free dquots */
2133         /* incore dquots in all f/s's */
2134         ndqused = atomic_read(&xfs_Gqm->qm_totaldquots) - nfree;
2135
2136         ASSERT(ndqused >= 0);
2137
2138         if (nfree <= ndqused && nfree < ndquot)
2139                 return 0;
2140
2141         ndqused *= xfs_Gqm->qm_dqfree_ratio;    /* target # of free dquots */
2142         n = nfree - ndqused - ndquot;           /* # over target */
2143
2144         return xfs_qm_shake_freelist(MAX(nfree, n));
2145 }
2146
2147
2148 /*------------------------------------------------------------------*/
2149
2150 /*
2151  * Return a new incore dquot. Depending on the number of
2152  * dquots in the system, we either allocate a new one on the kernel heap,
2153  * or reclaim a free one.
2154  * Return value is B_TRUE if we allocated a new dquot, B_FALSE if we managed
2155  * to reclaim an existing one from the freelist.
2156  */
2157 boolean_t
2158 xfs_qm_dqalloc_incore(
2159         xfs_dquot_t **O_dqpp)
2160 {
2161         xfs_dquot_t     *dqp;
2162
2163         /*
2164          * Check against high water mark to see if we want to pop
2165          * a nincompoop dquot off the freelist.
2166          */
2167         if (atomic_read(&xfs_Gqm->qm_totaldquots) >= ndquot) {
2168                 /*
2169                  * Try to recycle a dquot from the freelist.
2170                  */
2171                 if ((dqp = xfs_qm_dqreclaim_one())) {
2172                         XQM_STATS_INC(xqmstats.xs_qm_dqreclaims);
2173                         /*
2174                          * Just zero the core here. The rest will get
2175                          * reinitialized by caller. XXX we shouldn't even
2176                          * do this zero ...
2177                          */
2178                         memset(&dqp->q_core, 0, sizeof(dqp->q_core));
2179                         *O_dqpp = dqp;
2180                         return B_FALSE;
2181                 }
2182                 XQM_STATS_INC(xqmstats.xs_qm_dqreclaim_misses);
2183         }
2184
2185         /*
2186          * Allocate a brand new dquot on the kernel heap and return it
2187          * to the caller to initialize.
2188          */
2189         ASSERT(xfs_Gqm->qm_dqzone != NULL);
2190         *O_dqpp = kmem_zone_zalloc(xfs_Gqm->qm_dqzone, KM_SLEEP);
2191         atomic_inc(&xfs_Gqm->qm_totaldquots);
2192
2193         return B_TRUE;
2194 }
2195
2196
2197 /*
2198  * Start a transaction and write the incore superblock changes to
2199  * disk. flags parameter indicates which fields have changed.
2200  */
2201 int
2202 xfs_qm_write_sb_changes(
2203         xfs_mount_t     *mp,
2204         __int64_t       flags)
2205 {
2206         xfs_trans_t     *tp;
2207         int             error;
2208
2209 #ifdef QUOTADEBUG
2210         cmn_err(CE_NOTE, "Writing superblock quota changes :%s", mp->m_fsname);
2211 #endif
2212         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
2213         if ((error = xfs_trans_reserve(tp, 0,
2214                                       mp->m_sb.sb_sectsize + 128, 0,
2215                                       0,
2216                                       XFS_DEFAULT_LOG_COUNT))) {
2217                 xfs_trans_cancel(tp, 0);
2218                 return error;
2219         }
2220
2221         xfs_mod_sb(tp, flags);
2222         error = xfs_trans_commit(tp, 0);
2223
2224         return error;
2225 }
2226
2227
2228 /* --------------- utility functions for vnodeops ---------------- */
2229
2230
2231 /*
2232  * Given an inode, a uid and gid (from cred_t) make sure that we have
2233  * allocated relevant dquot(s) on disk, and that we won't exceed inode
2234  * quotas by creating this file.
2235  * This also attaches dquot(s) to the given inode after locking it,
2236  * and returns the dquots corresponding to the uid and/or gid.
2237  *
2238  * in   : inode (unlocked)
2239  * out  : udquot, gdquot with references taken and unlocked
2240  */
2241 int
2242 xfs_qm_vop_dqalloc(
2243         struct xfs_inode        *ip,
2244         uid_t                   uid,
2245         gid_t                   gid,
2246         prid_t                  prid,
2247         uint                    flags,
2248         struct xfs_dquot        **O_udqpp,
2249         struct xfs_dquot        **O_gdqpp)
2250 {
2251         struct xfs_mount        *mp = ip->i_mount;
2252         struct xfs_dquot        *uq, *gq;
2253         int                     error;
2254         uint                    lockflags;
2255
2256         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2257                 return 0;
2258
2259         lockflags = XFS_ILOCK_EXCL;
2260         xfs_ilock(ip, lockflags);
2261
2262         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
2263                 gid = ip->i_d.di_gid;
2264
2265         /*
2266          * Attach the dquot(s) to this inode, doing a dquot allocation
2267          * if necessary. The dquot(s) will not be locked.
2268          */
2269         if (XFS_NOT_DQATTACHED(mp, ip)) {
2270                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
2271                 if (error) {
2272                         xfs_iunlock(ip, lockflags);
2273                         return error;
2274                 }
2275         }
2276
2277         uq = gq = NULL;
2278         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
2279                 if (ip->i_d.di_uid != uid) {
2280                         /*
2281                          * What we need is the dquot that has this uid, and
2282                          * if we send the inode to dqget, the uid of the inode
2283                          * takes priority over what's sent in the uid argument.
2284                          * We must unlock inode here before calling dqget if
2285                          * we're not sending the inode, because otherwise
2286                          * we'll deadlock by doing trans_reserve while
2287                          * holding ilock.
2288                          */
2289                         xfs_iunlock(ip, lockflags);
2290                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
2291                                                  XFS_DQ_USER,
2292                                                  XFS_QMOPT_DQALLOC |
2293                                                  XFS_QMOPT_DOWARN,
2294                                                  &uq))) {
2295                                 ASSERT(error != ENOENT);
2296                                 return error;
2297                         }
2298                         /*
2299                          * Get the ilock in the right order.
2300                          */
2301                         xfs_dqunlock(uq);
2302                         lockflags = XFS_ILOCK_SHARED;
2303                         xfs_ilock(ip, lockflags);
2304                 } else {
2305                         /*
2306                          * Take an extra reference, because we'll return
2307                          * this to caller
2308                          */
2309                         ASSERT(ip->i_udquot);
2310                         uq = ip->i_udquot;
2311                         xfs_dqlock(uq);
2312                         XFS_DQHOLD(uq);
2313                         xfs_dqunlock(uq);
2314                 }
2315         }
2316         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
2317                 if (ip->i_d.di_gid != gid) {
2318                         xfs_iunlock(ip, lockflags);
2319                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
2320                                                  XFS_DQ_GROUP,
2321                                                  XFS_QMOPT_DQALLOC |
2322                                                  XFS_QMOPT_DOWARN,
2323                                                  &gq))) {
2324                                 if (uq)
2325                                         xfs_qm_dqrele(uq);
2326                                 ASSERT(error != ENOENT);
2327                                 return error;
2328                         }
2329                         xfs_dqunlock(gq);
2330                         lockflags = XFS_ILOCK_SHARED;
2331                         xfs_ilock(ip, lockflags);
2332                 } else {
2333                         ASSERT(ip->i_gdquot);
2334                         gq = ip->i_gdquot;
2335                         xfs_dqlock(gq);
2336                         XFS_DQHOLD(gq);
2337                         xfs_dqunlock(gq);
2338                 }
2339         } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
2340                 if (ip->i_d.di_projid != prid) {
2341                         xfs_iunlock(ip, lockflags);
2342                         if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
2343                                                  XFS_DQ_PROJ,
2344                                                  XFS_QMOPT_DQALLOC |
2345                                                  XFS_QMOPT_DOWARN,
2346                                                  &gq))) {
2347                                 if (uq)
2348                                         xfs_qm_dqrele(uq);
2349                                 ASSERT(error != ENOENT);
2350                                 return (error);
2351                         }
2352                         xfs_dqunlock(gq);
2353                         lockflags = XFS_ILOCK_SHARED;
2354                         xfs_ilock(ip, lockflags);
2355                 } else {
2356                         ASSERT(ip->i_gdquot);
2357                         gq = ip->i_gdquot;
2358                         xfs_dqlock(gq);
2359                         XFS_DQHOLD(gq);
2360                         xfs_dqunlock(gq);
2361                 }
2362         }
2363         if (uq)
2364                 trace_xfs_dquot_dqalloc(ip);
2365
2366         xfs_iunlock(ip, lockflags);
2367         if (O_udqpp)
2368                 *O_udqpp = uq;
2369         else if (uq)
2370                 xfs_qm_dqrele(uq);
2371         if (O_gdqpp)
2372                 *O_gdqpp = gq;
2373         else if (gq)
2374                 xfs_qm_dqrele(gq);
2375         return 0;
2376 }
2377
2378 /*
2379  * Actually transfer ownership, and do dquot modifications.
2380  * These were already reserved.
2381  */
2382 xfs_dquot_t *
2383 xfs_qm_vop_chown(
2384         xfs_trans_t     *tp,
2385         xfs_inode_t     *ip,
2386         xfs_dquot_t     **IO_olddq,
2387         xfs_dquot_t     *newdq)
2388 {
2389         xfs_dquot_t     *prevdq;
2390         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
2391                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
2392
2393
2394         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
2395         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
2396
2397         /* old dquot */
2398         prevdq = *IO_olddq;
2399         ASSERT(prevdq);
2400         ASSERT(prevdq != newdq);
2401
2402         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
2403         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
2404
2405         /* the sparkling new dquot */
2406         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
2407         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
2408
2409         /*
2410          * Take an extra reference, because the inode
2411          * is going to keep this dquot pointer even
2412          * after the trans_commit.
2413          */
2414         xfs_dqlock(newdq);
2415         XFS_DQHOLD(newdq);
2416         xfs_dqunlock(newdq);
2417         *IO_olddq = newdq;
2418
2419         return prevdq;
2420 }
2421
2422 /*
2423  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
2424  */
2425 int
2426 xfs_qm_vop_chown_reserve(
2427         xfs_trans_t     *tp,
2428         xfs_inode_t     *ip,
2429         xfs_dquot_t     *udqp,
2430         xfs_dquot_t     *gdqp,
2431         uint            flags)
2432 {
2433         xfs_mount_t     *mp = ip->i_mount;
2434         uint            delblks, blkflags, prjflags = 0;
2435         xfs_dquot_t     *unresudq, *unresgdq, *delblksudq, *delblksgdq;
2436         int             error;
2437
2438
2439         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
2440         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
2441
2442         delblks = ip->i_delayed_blks;
2443         delblksudq = delblksgdq = unresudq = unresgdq = NULL;
2444         blkflags = XFS_IS_REALTIME_INODE(ip) ?
2445                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
2446
2447         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
2448             ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
2449                 delblksudq = udqp;
2450                 /*
2451                  * If there are delayed allocation blocks, then we have to
2452                  * unreserve those from the old dquot, and add them to the
2453                  * new dquot.
2454                  */
2455                 if (delblks) {
2456                         ASSERT(ip->i_udquot);
2457                         unresudq = ip->i_udquot;
2458                 }
2459         }
2460         if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
2461                 if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
2462                      ip->i_d.di_projid != be32_to_cpu(gdqp->q_core.d_id))
2463                         prjflags = XFS_QMOPT_ENOSPC;
2464
2465                 if (prjflags ||
2466                     (XFS_IS_GQUOTA_ON(ip->i_mount) &&
2467                      ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
2468                         delblksgdq = gdqp;
2469                         if (delblks) {
2470                                 ASSERT(ip->i_gdquot);
2471                                 unresgdq = ip->i_gdquot;
2472                         }
2473                 }
2474         }
2475
2476         if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
2477                                 delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
2478                                 flags | blkflags | prjflags)))
2479                 return (error);
2480
2481         /*
2482          * Do the delayed blks reservations/unreservations now. Since, these
2483          * are done without the help of a transaction, if a reservation fails
2484          * its previous reservations won't be automatically undone by trans
2485          * code. So, we have to do it manually here.
2486          */
2487         if (delblks) {
2488                 /*
2489                  * Do the reservations first. Unreservation can't fail.
2490                  */
2491                 ASSERT(delblksudq || delblksgdq);
2492                 ASSERT(unresudq || unresgdq);
2493                 if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
2494                                 delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
2495                                 flags | blkflags | prjflags)))
2496                         return (error);
2497                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
2498                                 unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
2499                                 blkflags);
2500         }
2501
2502         return (0);
2503 }
2504
2505 int
2506 xfs_qm_vop_rename_dqattach(
2507         struct xfs_inode        **i_tab)
2508 {
2509         struct xfs_mount        *mp = i_tab[0]->i_mount;
2510         int                     i;
2511
2512         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2513                 return 0;
2514
2515         for (i = 0; (i < 4 && i_tab[i]); i++) {
2516                 struct xfs_inode        *ip = i_tab[i];
2517                 int                     error;
2518
2519                 /*
2520                  * Watch out for duplicate entries in the table.
2521                  */
2522                 if (i == 0 || ip != i_tab[i-1]) {
2523                         if (XFS_NOT_DQATTACHED(mp, ip)) {
2524                                 error = xfs_qm_dqattach(ip, 0);
2525                                 if (error)
2526                                         return error;
2527                         }
2528                 }
2529         }
2530         return 0;
2531 }
2532
2533 void
2534 xfs_qm_vop_create_dqattach(
2535         struct xfs_trans        *tp,
2536         struct xfs_inode        *ip,
2537         struct xfs_dquot        *udqp,
2538         struct xfs_dquot        *gdqp)
2539 {
2540         struct xfs_mount        *mp = tp->t_mountp;
2541
2542         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2543                 return;
2544
2545         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
2546         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
2547
2548         if (udqp) {
2549                 xfs_dqlock(udqp);
2550                 XFS_DQHOLD(udqp);
2551                 xfs_dqunlock(udqp);
2552                 ASSERT(ip->i_udquot == NULL);
2553                 ip->i_udquot = udqp;
2554                 ASSERT(XFS_IS_UQUOTA_ON(mp));
2555                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
2556                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
2557         }
2558         if (gdqp) {
2559                 xfs_dqlock(gdqp);
2560                 XFS_DQHOLD(gdqp);
2561                 xfs_dqunlock(gdqp);
2562                 ASSERT(ip->i_gdquot == NULL);
2563                 ip->i_gdquot = gdqp;
2564                 ASSERT(XFS_IS_OQUOTA_ON(mp));
2565                 ASSERT((XFS_IS_GQUOTA_ON(mp) ?
2566                         ip->i_d.di_gid : ip->i_d.di_projid) ==
2567                                 be32_to_cpu(gdqp->q_core.d_id));
2568                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
2569         }
2570 }
2571