fs/xfs/xfs_qm.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_inode.h"
  28 #include "xfs_ialloc.h"
  29 #include "xfs_itable.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_error.h"
  32 #include "xfs_bmap.h"
  33 #include "xfs_bmap_btree.h"
  34 #include "xfs_bmap_util.h"
  35 #include "xfs_trans.h"
  36 #include "xfs_trans_space.h"
  37 #include "xfs_qm.h"
  38 #include "xfs_trace.h"
  39 #include "xfs_icache.h"
  40 #include "xfs_cksum.h"
  41
  42 /*
  43  * The global quota manager. There is only one of these for the entire
  44  * system, _not_ one per file system. XQM keeps track of the overall
  45  * quota functionality, including maintaining the freelist and hash
  46  * tables of dquots.
  47  */
  48 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  49 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  50
  51 STATIC void     xfs_qm_destroy_quotainos(xfs_quotainfo_t *qi);
  52 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  53 /*
  54  * We use the batch lookup interface to iterate over the dquots as it
  55  * currently is the only interface into the radix tree code that allows
  56  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  57  * operations is fine as all callers are used either during mount/umount
  58  * or quotaoff.
  59  */
  60 #define XFS_DQ_LOOKUP_BATCH     32
  61
  62 STATIC int
  63 xfs_qm_dquot_walk(
  64         struct xfs_mount        *mp,
  65         int                     type,
  66         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  67         void                    *data)
  68 {
  69         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  70         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  71         uint32_t                next_index;
  72         int                     last_error = 0;
  73         int                     skipped;
  74         int                     nr_found;
  75
  76 restart:
  77         skipped = 0;
  78         next_index = 0;
  79         nr_found = 0;
  80
  81         while (1) {
  82                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  83                 int             error = 0;
  84                 int             i;
  85
  86                 mutex_lock(&qi->qi_tree_lock);
  87                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  88                                         next_index, XFS_DQ_LOOKUP_BATCH);
  89                 if (!nr_found) {
  90                         mutex_unlock(&qi->qi_tree_lock);
  91                         break;
  92                 }
  93
  94                 for (i = 0; i < nr_found; i++) {
  95                         struct xfs_dquot *dqp = batch[i];
  96
  97                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  98
  99                         error = execute(batch[i], data);
 100                         if (error == -EAGAIN) {
 101                                 skipped++;
 102                                 continue;
 103                         }
 104                         if (error && last_error != -EFSCORRUPTED)
 105                                 last_error = error;
 106                 }
 107
 108                 mutex_unlock(&qi->qi_tree_lock);
 109
 110                 /* bail out if the filesystem is corrupted.  */
 111                 if (last_error == -EFSCORRUPTED) {
 112                         skipped = 0;
 113                         break;
 114                 }
 115                 /* we're done if id overflows back to zero */
 116                 if (!next_index)
 117                         break;
 118         }
 119
 120         if (skipped) {
 121                 delay(1);
 122                 goto restart;
 123         }
 124
 125         return last_error;
 126 }
 127
 128
 129 /*
 130  * Purge a dquot from all tracking data structures and free it.
 131  */
 132 STATIC int
 133 xfs_qm_dqpurge(
 134         struct xfs_dquot        *dqp,
 135         void                    *data)
 136 {
 137         struct xfs_mount        *mp = dqp->q_mount;
 138         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 139
 140         xfs_dqlock(dqp);
 141         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 142                 xfs_dqunlock(dqp);
 143                 return -EAGAIN;
 144         }
 145
 146         dqp->dq_flags |= XFS_DQ_FREEING;
 147
 148         xfs_dqflock(dqp);
 149
 150         /*
 151          * If we are turning this type of quotas off, we don't care
 152          * about the dirty metadata sitting in this dquot. OTOH, if
 153          * we're unmounting, we do care, so we flush it and wait.
 154          */
 155         if (XFS_DQ_IS_DIRTY(dqp)) {
 156                 struct xfs_buf  *bp = NULL;
 157                 int             error;
 158
 159                 /*
 160                  * We don't care about getting disk errors here. We need
 161                  * to purge this dquot anyway, so we go ahead regardless.
 162                  */
 163                 error = xfs_qm_dqflush(dqp, &bp);
 164                 if (error) {
 165                         xfs_warn(mp, "%s: dquot "PTR_FMT" flush failed",
 166                                 __func__, dqp);
 167                 } else {
 168                         error = xfs_bwrite(bp);
 169                         xfs_buf_relse(bp);
 170                 }
 171                 xfs_dqflock(dqp);
 172         }
 173
 174         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 175         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 176                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 177
 178         xfs_dqfunlock(dqp);
 179         xfs_dqunlock(dqp);
 180
 181         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 182                           be32_to_cpu(dqp->q_core.d_id));
 183         qi->qi_dquots--;
 184
 185         /*
 186          * We move dquots to the freelist as soon as their reference count
 187          * hits zero, so it really should be on the freelist here.
 188          */
 189         ASSERT(!list_empty(&dqp->q_lru));
 190         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 191         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 192
 193         xfs_qm_dqdestroy(dqp);
 194         return 0;
 195 }
 196
 197 /*
 198  * Purge the dquot cache.
 199  */
 200 void
 201 xfs_qm_dqpurge_all(
 202         struct xfs_mount        *mp,
 203         uint                    flags)
 204 {
 205         if (flags & XFS_QMOPT_UQUOTA)
 206                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 207         if (flags & XFS_QMOPT_GQUOTA)
 208                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 209         if (flags & XFS_QMOPT_PQUOTA)
 210                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 211 }
 212
 213 /*
 214  * Just destroy the quotainfo structure.
 215  */
 216 void
 217 xfs_qm_unmount(
 218         struct xfs_mount        *mp)
 219 {
 220         if (mp->m_quotainfo) {
 221                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 222                 xfs_qm_destroy_quotainfo(mp);
 223         }
 224 }
 225
 226 /*
 227  * Called from the vfsops layer.
 228  */
 229 void
 230 xfs_qm_unmount_quotas(
 231         xfs_mount_t     *mp)
 232 {
 233         /*
 234          * Release the dquots that root inode, et al might be holding,
 235          * before we flush quotas and blow away the quotainfo structure.
 236          */
 237         ASSERT(mp->m_rootip);
 238         xfs_qm_dqdetach(mp->m_rootip);
 239         if (mp->m_rbmip)
 240                 xfs_qm_dqdetach(mp->m_rbmip);
 241         if (mp->m_rsumip)
 242                 xfs_qm_dqdetach(mp->m_rsumip);
 243
 244         /*
 245          * Release the quota inodes.
 246          */
 247         if (mp->m_quotainfo) {
 248                 if (mp->m_quotainfo->qi_uquotaip) {
 249                         IRELE(mp->m_quotainfo->qi_uquotaip);
 250                         mp->m_quotainfo->qi_uquotaip = NULL;
 251                 }
 252                 if (mp->m_quotainfo->qi_gquotaip) {
 253                         IRELE(mp->m_quotainfo->qi_gquotaip);
 254                         mp->m_quotainfo->qi_gquotaip = NULL;
 255                 }
 256                 if (mp->m_quotainfo->qi_pquotaip) {
 257                         IRELE(mp->m_quotainfo->qi_pquotaip);
 258                         mp->m_quotainfo->qi_pquotaip = NULL;
 259                 }
 260         }
 261 }
 262
 263 STATIC int
 264 xfs_qm_dqattach_one(
 265         xfs_inode_t     *ip,
 266         xfs_dqid_t      id,
 267         uint            type,
 268         uint            doalloc,
 269         xfs_dquot_t     **IO_idqpp)
 270 {
 271         xfs_dquot_t     *dqp;
 272         int             error;
 273
 274         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 275         error = 0;
 276
 277         /*
 278          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 279          * or &i_gdquot. This made the code look weird, but made the logic a lot
 280          * simpler.
 281          */
 282         dqp = *IO_idqpp;
 283         if (dqp) {
 284                 trace_xfs_dqattach_found(dqp);
 285                 return 0;
 286         }
 287
 288         /*
 289          * Find the dquot from somewhere. This bumps the reference count of
 290          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 291          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 292          * turned off suddenly.
 293          */
 294         error = xfs_qm_dqget(ip->i_mount, ip, id, type, doalloc, &dqp);
 295         if (error)
 296                 return error;
 297
 298         trace_xfs_dqattach_get(dqp);
 299
 300         /*
 301          * dqget may have dropped and re-acquired the ilock, but it guarantees
 302          * that the dquot returned is the one that should go in the inode.
 303          */
 304         *IO_idqpp = dqp;
 305         xfs_dqunlock(dqp);
 306         return 0;
 307 }
 308
 309 static bool
 310 xfs_qm_need_dqattach(
 311         struct xfs_inode        *ip)
 312 {
 313         struct xfs_mount        *mp = ip->i_mount;
 314
 315         if (!XFS_IS_QUOTA_RUNNING(mp))
 316                 return false;
 317         if (!XFS_IS_QUOTA_ON(mp))
 318                 return false;
 319         if (!XFS_NOT_DQATTACHED(mp, ip))
 320                 return false;
 321         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 322                 return false;
 323         return true;
 324 }
 325
 326 /*
 327  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 328  * into account.
 329  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 330  * Inode may get unlocked and relocked in here, and the caller must deal with
 331  * the consequences.
 332  */
 333 int
 334 xfs_qm_dqattach_locked(
 335         xfs_inode_t     *ip,
 336         uint            flags)
 337 {
 338         xfs_mount_t     *mp = ip->i_mount;
 339         int             error = 0;
 340
 341         if (!xfs_qm_need_dqattach(ip))
 342                 return 0;
 343
 344         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 345
 346         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 347                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 348                                                 flags & XFS_QMOPT_DQALLOC,
 349                                                 &ip->i_udquot);
 350                 if (error)
 351                         goto done;
 352                 ASSERT(ip->i_udquot);
 353         }
 354
 355         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 356                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 357                                                 flags & XFS_QMOPT_DQALLOC,
 358                                                 &ip->i_gdquot);
 359                 if (error)
 360                         goto done;
 361                 ASSERT(ip->i_gdquot);
 362         }
 363
 364         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 365                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 366                                                 flags & XFS_QMOPT_DQALLOC,
 367                                                 &ip->i_pdquot);
 368                 if (error)
 369                         goto done;
 370                 ASSERT(ip->i_pdquot);
 371         }
 372
 373 done:
 374         /*
 375          * Don't worry about the dquots that we may have attached before any
 376          * error - they'll get detached later if it has not already been done.
 377          */
 378         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 379         return error;
 380 }
 381
 382 int
 383 xfs_qm_dqattach(
 384         struct xfs_inode        *ip,
 385         uint                    flags)
 386 {
 387         int                     error;
 388
 389         if (!xfs_qm_need_dqattach(ip))
 390                 return 0;
 391
 392         xfs_ilock(ip, XFS_ILOCK_EXCL);
 393         error = xfs_qm_dqattach_locked(ip, flags);
 394         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 395
 396         return error;
 397 }
 398
 399 /*
 400  * Release dquots (and their references) if any.
 401  * The inode should be locked EXCL except when this's called by
 402  * xfs_ireclaim.
 403  */
 404 void
 405 xfs_qm_dqdetach(
 406         xfs_inode_t     *ip)
 407 {
 408         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 409                 return;
 410
 411         trace_xfs_dquot_dqdetach(ip);
 412
 413         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 414         if (ip->i_udquot) {
 415                 xfs_qm_dqrele(ip->i_udquot);
 416                 ip->i_udquot = NULL;
 417         }
 418         if (ip->i_gdquot) {
 419                 xfs_qm_dqrele(ip->i_gdquot);
 420                 ip->i_gdquot = NULL;
 421         }
 422         if (ip->i_pdquot) {
 423                 xfs_qm_dqrele(ip->i_pdquot);
 424                 ip->i_pdquot = NULL;
 425         }
 426 }
 427
 428 struct xfs_qm_isolate {
 429         struct list_head        buffers;
 430         struct list_head        dispose;
 431 };
 432
 433 static enum lru_status
 434 xfs_qm_dquot_isolate(
 435         struct list_head        *item,
 436         struct list_lru_one     *lru,
 437         spinlock_t              *lru_lock,
 438         void                    *arg)
 439                 __releases(lru_lock) __acquires(lru_lock)
 440 {
 441         struct xfs_dquot        *dqp = container_of(item,
 442                                                 struct xfs_dquot, q_lru);
 443         struct xfs_qm_isolate   *isol = arg;
 444
 445         if (!xfs_dqlock_nowait(dqp))
 446                 goto out_miss_busy;
 447
 448         /*
 449          * This dquot has acquired a reference in the meantime remove it from
 450          * the freelist and try again.
 451          */
 452         if (dqp->q_nrefs) {
 453                 xfs_dqunlock(dqp);
 454                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 455
 456                 trace_xfs_dqreclaim_want(dqp);
 457                 list_lru_isolate(lru, &dqp->q_lru);
 458                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 459                 return LRU_REMOVED;
 460         }
 461
 462         /*
 463          * If the dquot is dirty, flush it. If it's already being flushed, just
 464          * skip it so there is time for the IO to complete before we try to
 465          * reclaim it again on the next LRU pass.
 466          */
 467         if (!xfs_dqflock_nowait(dqp)) {
 468                 xfs_dqunlock(dqp);
 469                 goto out_miss_busy;
 470         }
 471
 472         if (XFS_DQ_IS_DIRTY(dqp)) {
 473                 struct xfs_buf  *bp = NULL;
 474                 int             error;
 475
 476                 trace_xfs_dqreclaim_dirty(dqp);
 477
 478                 /* we have to drop the LRU lock to flush the dquot */
 479                 spin_unlock(lru_lock);
 480
 481                 error = xfs_qm_dqflush(dqp, &bp);
 482                 if (error) {
 483                         xfs_warn(dqp->q_mount, "%s: dquot "PTR_FMT" flush failed",
 484                                  __func__, dqp);
 485                         goto out_unlock_dirty;
 486                 }
 487
 488                 xfs_buf_delwri_queue(bp, &isol->buffers);
 489                 xfs_buf_relse(bp);
 490                 goto out_unlock_dirty;
 491         }
 492         xfs_dqfunlock(dqp);
 493
 494         /*
 495          * Prevent lookups now that we are past the point of no return.
 496          */
 497         dqp->dq_flags |= XFS_DQ_FREEING;
 498         xfs_dqunlock(dqp);
 499
 500         ASSERT(dqp->q_nrefs == 0);
 501         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 502         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 503         trace_xfs_dqreclaim_done(dqp);
 504         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 505         return LRU_REMOVED;
 506
 507 out_miss_busy:
 508         trace_xfs_dqreclaim_busy(dqp);
 509         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 510         return LRU_SKIP;
 511
 512 out_unlock_dirty:
 513         trace_xfs_dqreclaim_busy(dqp);
 514         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 515         xfs_dqunlock(dqp);
 516         spin_lock(lru_lock);
 517         return LRU_RETRY;
 518 }
 519
 520 static unsigned long
 521 xfs_qm_shrink_scan(
 522         struct shrinker         *shrink,
 523         struct shrink_control   *sc)
 524 {
 525         struct xfs_quotainfo    *qi = container_of(shrink,
 526                                         struct xfs_quotainfo, qi_shrinker);
 527         struct xfs_qm_isolate   isol;
 528         unsigned long           freed;
 529         int                     error;
 530
 531         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 532                 return 0;
 533
 534         INIT_LIST_HEAD(&isol.buffers);
 535         INIT_LIST_HEAD(&isol.dispose);
 536
 537         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 538                                      xfs_qm_dquot_isolate, &isol);
 539
 540         error = xfs_buf_delwri_submit(&isol.buffers);
 541         if (error)
 542                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 543
 544         while (!list_empty(&isol.dispose)) {
 545                 struct xfs_dquot        *dqp;
 546
 547                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 548                 list_del_init(&dqp->q_lru);
 549                 xfs_qm_dqfree_one(dqp);
 550         }
 551
 552         return freed;
 553 }
 554
 555 static unsigned long
 556 xfs_qm_shrink_count(
 557         struct shrinker         *shrink,
 558         struct shrink_control   *sc)
 559 {
 560         struct xfs_quotainfo    *qi = container_of(shrink,
 561                                         struct xfs_quotainfo, qi_shrinker);
 562
 563         return list_lru_shrink_count(&qi->qi_lru, sc);
 564 }
 565
 566 STATIC void
 567 xfs_qm_set_defquota(
 568         xfs_mount_t     *mp,
 569         uint            type,
 570         xfs_quotainfo_t *qinf)
 571 {
 572         xfs_dquot_t             *dqp;
 573         struct xfs_def_quota    *defq;
 574         int                     error;
 575
 576         error = xfs_qm_dqread(mp, 0, type, 0, &dqp);
 577
 578         if (!error) {
 579                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 580
 581                 defq = xfs_get_defquota(dqp, qinf);
 582
 583                 /*
 584                  * Timers and warnings have been already set, let's just set the
 585                  * default limits for this quota type
 586                  */
 587                 defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 588                 defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 589                 defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 590                 defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 591                 defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 592                 defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 593                 xfs_qm_dqdestroy(dqp);
 594         }
 595 }
 596
 597 /*
 598  * This initializes all the quota information that's kept in the
 599  * mount structure
 600  */
 601 STATIC int
 602 xfs_qm_init_quotainfo(
 603         xfs_mount_t     *mp)
 604 {
 605         xfs_quotainfo_t *qinf;
 606         int             error;
 607         xfs_dquot_t     *dqp;
 608
 609         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 610
 611         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 612
 613         error = list_lru_init(&qinf->qi_lru);
 614         if (error)
 615                 goto out_free_qinf;
 616
 617         /*
 618          * See if quotainodes are setup, and if not, allocate them,
 619          * and change the superblock accordingly.
 620          */
 621         error = xfs_qm_init_quotainos(mp);
 622         if (error)
 623                 goto out_free_lru;
 624
 625         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 626         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 627         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 628         mutex_init(&qinf->qi_tree_lock);
 629
 630         /* mutex used to serialize quotaoffs */
 631         mutex_init(&qinf->qi_quotaofflock);
 632
 633         /* Precalc some constants */
 634         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 635         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 636
 637         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 638
 639         /*
 640          * We try to get the limits from the superuser's limits fields.
 641          * This is quite hacky, but it is standard quota practice.
 642          *
 643          * Since we may not have done a quotacheck by this point, just read
 644          * the dquot without attaching it to any hashtables or lists.
 645          *
 646          * Timers and warnings are globally set by the first timer found in
 647          * user/group/proj quota types, otherwise a default value is used.
 648          * This should be split into different fields per quota type.
 649          */
 650         error = xfs_qm_dqread(mp, 0,
 651                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 652                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 653                           XFS_DQ_PROJ),
 654                         0, &dqp);
 655
 656         if (!error) {
 657                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 658
 659                 /*
 660                  * The warnings and timers set the grace period given to
 661                  * a user or group before he or she can not perform any
 662                  * more writing. If it is zero, a default is used.
 663                  */
 664                 qinf->qi_btimelimit = ddqp->d_btimer ?
 665                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 666                 qinf->qi_itimelimit = ddqp->d_itimer ?
 667                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 668                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 669                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 670                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 671                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 672                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 673                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 674                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 675                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 676                 xfs_qm_dqdestroy(dqp);
 677         } else {
 678                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 679                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 680                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 681                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 682                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 683                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 684         }
 685
 686         if (XFS_IS_UQUOTA_RUNNING(mp))
 687                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 688         if (XFS_IS_GQUOTA_RUNNING(mp))
 689                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 690         if (XFS_IS_PQUOTA_RUNNING(mp))
 691                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 692
 693         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 694         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 695         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 696         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 697
 698         error = register_shrinker(&qinf->qi_shrinker);
 699         if (error)
 700                 goto out_free_inos;
 701
 702         return 0;
 703
 704 out_free_inos:
 705         mutex_destroy(&qinf->qi_quotaofflock);
 706         mutex_destroy(&qinf->qi_tree_lock);
 707         xfs_qm_destroy_quotainos(qinf);
 708 out_free_lru:
 709         list_lru_destroy(&qinf->qi_lru);
 710 out_free_qinf:
 711         kmem_free(qinf);
 712         mp->m_quotainfo = NULL;
 713         return error;
 714 }
 715
 716 /*
 717  * Gets called when unmounting a filesystem or when all quotas get
 718  * turned off.
 719  * This purges the quota inodes, destroys locks and frees itself.
 720  */
 721 void
 722 xfs_qm_destroy_quotainfo(
 723         xfs_mount_t     *mp)
 724 {
 725         xfs_quotainfo_t *qi;
 726
 727         qi = mp->m_quotainfo;
 728         ASSERT(qi != NULL);
 729
 730         unregister_shrinker(&qi->qi_shrinker);
 731         list_lru_destroy(&qi->qi_lru);
 732         xfs_qm_destroy_quotainos(qi);
 733         mutex_destroy(&qi->qi_tree_lock);
 734         mutex_destroy(&qi->qi_quotaofflock);
 735         kmem_free(qi);
 736         mp->m_quotainfo = NULL;
 737 }
 738
 739 /*
 740  * Create an inode and return with a reference already taken, but unlocked
 741  * This is how we create quota inodes
 742  */
 743 STATIC int
 744 xfs_qm_qino_alloc(
 745         xfs_mount_t     *mp,
 746         xfs_inode_t     **ip,
 747         uint            flags)
 748 {
 749         xfs_trans_t     *tp;
 750         int             error;
 751         bool            need_alloc = true;
 752
 753         *ip = NULL;
 754         /*
 755          * With superblock that doesn't have separate pquotino, we
 756          * share an inode between gquota and pquota. If the on-disk
 757          * superblock has GQUOTA and the filesystem is now mounted
 758          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 759          * vice-versa.
 760          */
 761         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 762                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 763                 xfs_ino_t ino = NULLFSINO;
 764
 765                 if ((flags & XFS_QMOPT_PQUOTA) &&
 766                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 767                         ino = mp->m_sb.sb_gquotino;
 768                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 769                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 770                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 771                         ino = mp->m_sb.sb_pquotino;
 772                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 773                 }
 774                 if (ino != NULLFSINO) {
 775                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 776                         if (error)
 777                                 return error;
 778                         mp->m_sb.sb_gquotino = NULLFSINO;
 779                         mp->m_sb.sb_pquotino = NULLFSINO;
 780                         need_alloc = false;
 781                 }
 782         }
 783
 784         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 785                         XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 786         if (error)
 787                 return error;
 788
 789         if (need_alloc) {
 790                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
 791                 if (error) {
 792                         xfs_trans_cancel(tp);
 793                         return error;
 794                 }
 795         }
 796
 797         /*
 798          * Make the changes in the superblock, and log those too.
 799          * sbfields arg may contain fields other than *QUOTINO;
 800          * VERSIONNUM for example.
 801          */
 802         spin_lock(&mp->m_sb_lock);
 803         if (flags & XFS_QMOPT_SBVERSION) {
 804                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 805
 806                 xfs_sb_version_addquota(&mp->m_sb);
 807                 mp->m_sb.sb_uquotino = NULLFSINO;
 808                 mp->m_sb.sb_gquotino = NULLFSINO;
 809                 mp->m_sb.sb_pquotino = NULLFSINO;
 810
 811                 /* qflags will get updated fully _after_ quotacheck */
 812                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 813         }
 814         if (flags & XFS_QMOPT_UQUOTA)
 815                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 816         else if (flags & XFS_QMOPT_GQUOTA)
 817                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 818         else
 819                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 820         spin_unlock(&mp->m_sb_lock);
 821         xfs_log_sb(tp);
 822
 823         error = xfs_trans_commit(tp);
 824         if (error) {
 825                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 826                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 827         }
 828         if (need_alloc)
 829                 xfs_finish_inode_setup(*ip);
 830         return error;
 831 }
 832
 833
 834 STATIC void
 835 xfs_qm_reset_dqcounts(
 836         xfs_mount_t     *mp,
 837         xfs_buf_t       *bp,
 838         xfs_dqid_t      id,
 839         uint            type)
 840 {
 841         struct xfs_dqblk        *dqb;
 842         int                     j;
 843         xfs_failaddr_t          fa;
 844
 845         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 846
 847         /*
 848          * Reset all counters and timers. They'll be
 849          * started afresh by xfs_qm_quotacheck.
 850          */
 851 #ifdef DEBUG
 852         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 853                 sizeof(xfs_dqblk_t);
 854         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 855 #endif
 856         dqb = bp->b_addr;
 857         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 858                 struct xfs_disk_dquot   *ddq;
 859
 860                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 861
 862                 /*
 863                  * Do a sanity check, and if needed, repair the dqblk. Don't
 864                  * output any warnings because it's perfectly possible to
 865                  * find uninitialised dquot blks. See comment in
 866                  * xfs_dquot_verify.
 867                  */
 868                 fa = xfs_dquot_verify(mp, ddq, id + j, type, 0);
 869                 if (fa)
 870                         xfs_dquot_repair(mp, ddq, id + j, type);
 871
 872                 /*
 873                  * Reset type in case we are reusing group quota file for
 874                  * project quotas or vice versa
 875                  */
 876                 ddq->d_flags = type;
 877                 ddq->d_bcount = 0;
 878                 ddq->d_icount = 0;
 879                 ddq->d_rtbcount = 0;
 880                 ddq->d_btimer = 0;
 881                 ddq->d_itimer = 0;
 882                 ddq->d_rtbtimer = 0;
 883                 ddq->d_bwarns = 0;
 884                 ddq->d_iwarns = 0;
 885                 ddq->d_rtbwarns = 0;
 886
 887                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 888                         xfs_update_cksum((char *)&dqb[j],
 889                                          sizeof(struct xfs_dqblk),
 890                                          XFS_DQUOT_CRC_OFF);
 891                 }
 892         }
 893 }
 894
 895 STATIC int
 896 xfs_qm_dqiter_bufs(
 897         struct xfs_mount        *mp,
 898         xfs_dqid_t              firstid,
 899         xfs_fsblock_t           bno,
 900         xfs_filblks_t           blkcnt,
 901         uint                    flags,
 902         struct list_head        *buffer_list)
 903 {
 904         struct xfs_buf          *bp;
 905         int                     error;
 906         int                     type;
 907
 908         ASSERT(blkcnt > 0);
 909         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 910                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 911         error = 0;
 912
 913         /*
 914          * Blkcnt arg can be a very big number, and might even be
 915          * larger than the log itself. So, we have to break it up into
 916          * manageable-sized transactions.
 917          * Note that we don't start a permanent transaction here; we might
 918          * not be able to get a log reservation for the whole thing up front,
 919          * and we don't really care to either, because we just discard
 920          * everything if we were to crash in the middle of this loop.
 921          */
 922         while (blkcnt--) {
 923                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 924                               XFS_FSB_TO_DADDR(mp, bno),
 925                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 926                               &xfs_dquot_buf_ops);
 927
 928                 /*
 929                  * CRC and validation errors will return a EFSCORRUPTED here. If
 930                  * this occurs, re-read without CRC validation so that we can
 931                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 932                  * will leave a trace in the log indicating corruption has
 933                  * been detected.
 934                  */
 935                 if (error == -EFSCORRUPTED) {
 936                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 937                                       XFS_FSB_TO_DADDR(mp, bno),
 938                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 939                                       NULL);
 940                 }
 941
 942                 if (error)
 943                         break;
 944
 945                 /*
 946                  * A corrupt buffer might not have a verifier attached, so
 947                  * make sure we have the correct one attached before writeback
 948                  * occurs.
 949                  */
 950                 bp->b_ops = &xfs_dquot_buf_ops;
 951                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 952                 xfs_buf_delwri_queue(bp, buffer_list);
 953                 xfs_buf_relse(bp);
 954
 955                 /* goto the next block. */
 956                 bno++;
 957                 firstid += mp->m_quotainfo->qi_dqperchunk;
 958         }
 959
 960         return error;
 961 }
 962
 963 /*
 964  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 965  * caller supplied function for every chunk of dquots that we find.
 966  */
 967 STATIC int
 968 xfs_qm_dqiterate(
 969         struct xfs_mount        *mp,
 970         struct xfs_inode        *qip,
 971         uint                    flags,
 972         struct list_head        *buffer_list)
 973 {
 974         struct xfs_bmbt_irec    *map;
 975         int                     i, nmaps;       /* number of map entries */
 976         int                     error;          /* return value */
 977         xfs_fileoff_t           lblkno;
 978         xfs_filblks_t           maxlblkcnt;
 979         xfs_dqid_t              firstid;
 980         xfs_fsblock_t           rablkno;
 981         xfs_filblks_t           rablkcnt;
 982
 983         error = 0;
 984         /*
 985          * This looks racy, but we can't keep an inode lock across a
 986          * trans_reserve. But, this gets called during quotacheck, and that
 987          * happens only at mount time which is single threaded.
 988          */
 989         if (qip->i_d.di_nblocks == 0)
 990                 return 0;
 991
 992         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 993
 994         lblkno = 0;
 995         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 996         do {
 997                 uint            lock_mode;
 998
 999                 nmaps = XFS_DQITER_MAP_SIZE;
1000                 /*
1001                  * We aren't changing the inode itself. Just changing
1002                  * some of its data. No new blocks are added here, and
1003                  * the inode is never added to the transaction.
1004                  */
1005                 lock_mode = xfs_ilock_data_map_shared(qip);
1006                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1007                                        map, &nmaps, 0);
1008                 xfs_iunlock(qip, lock_mode);
1009                 if (error)
1010                         break;
1011
1012                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1013                 for (i = 0; i < nmaps; i++) {
1014                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1015                         ASSERT(map[i].br_blockcount);
1016
1017
1018                         lblkno += map[i].br_blockcount;
1019
1020                         if (map[i].br_startblock == HOLESTARTBLOCK)
1021                                 continue;
1022
1023                         firstid = (xfs_dqid_t) map[i].br_startoff *
1024                                 mp->m_quotainfo->qi_dqperchunk;
1025                         /*
1026                          * Do a read-ahead on the next extent.
1027                          */
1028                         if ((i+1 < nmaps) &&
1029                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1030                                 rablkcnt =  map[i+1].br_blockcount;
1031                                 rablkno = map[i+1].br_startblock;
1032                                 while (rablkcnt--) {
1033                                         xfs_buf_readahead(mp->m_ddev_targp,
1034                                                XFS_FSB_TO_DADDR(mp, rablkno),
1035                                                mp->m_quotainfo->qi_dqchunklen,
1036                                                &xfs_dquot_buf_ops);
1037                                         rablkno++;
1038                                 }
1039                         }
1040                         /*
1041                          * Iterate thru all the blks in the extent and
1042                          * reset the counters of all the dquots inside them.
1043                          */
1044                         error = xfs_qm_dqiter_bufs(mp, firstid,
1045                                                    map[i].br_startblock,
1046                                                    map[i].br_blockcount,
1047                                                    flags, buffer_list);
1048                         if (error)
1049                                 goto out;
1050                 }
1051         } while (nmaps > 0);
1052
1053 out:
1054         kmem_free(map);
1055         return error;
1056 }
1057
1058 /*
1059  * Called by dqusage_adjust in doing a quotacheck.
1060  *
1061  * Given the inode, and a dquot id this updates both the incore dqout as well
1062  * as the buffer copy. This is so that once the quotacheck is done, we can
1063  * just log all the buffers, as opposed to logging numerous updates to
1064  * individual dquots.
1065  */
1066 STATIC int
1067 xfs_qm_quotacheck_dqadjust(
1068         struct xfs_inode        *ip,
1069         xfs_dqid_t              id,
1070         uint                    type,
1071         xfs_qcnt_t              nblks,
1072         xfs_qcnt_t              rtblks)
1073 {
1074         struct xfs_mount        *mp = ip->i_mount;
1075         struct xfs_dquot        *dqp;
1076         int                     error;
1077
1078         error = xfs_qm_dqget(mp, ip, id, type, XFS_QMOPT_DQALLOC, &dqp);
1079         if (error) {
1080                 /*
1081                  * Shouldn't be able to turn off quotas here.
1082                  */
1083                 ASSERT(error != -ESRCH);
1084                 ASSERT(error != -ENOENT);
1085                 return error;
1086         }
1087
1088         trace_xfs_dqadjust(dqp);
1089
1090         /*
1091          * Adjust the inode count and the block count to reflect this inode's
1092          * resource usage.
1093          */
1094         be64_add_cpu(&dqp->q_core.d_icount, 1);
1095         dqp->q_res_icount++;
1096         if (nblks) {
1097                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1098                 dqp->q_res_bcount += nblks;
1099         }
1100         if (rtblks) {
1101                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1102                 dqp->q_res_rtbcount += rtblks;
1103         }
1104
1105         /*
1106          * Set default limits, adjust timers (since we changed usages)
1107          *
1108          * There are no timers for the default values set in the root dquot.
1109          */
1110         if (dqp->q_core.d_id) {
1111                 xfs_qm_adjust_dqlimits(mp, dqp);
1112                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1113         }
1114
1115         dqp->dq_flags |= XFS_DQ_DIRTY;
1116         xfs_qm_dqput(dqp);
1117         return 0;
1118 }
1119
1120 /*
1121  * callback routine supplied to bulkstat(). Given an inumber, find its
1122  * dquots and update them to account for resources taken by that inode.
1123  */
1124 /* ARGSUSED */
1125 STATIC int
1126 xfs_qm_dqusage_adjust(
1127         xfs_mount_t     *mp,            /* mount point for filesystem */
1128         xfs_ino_t       ino,            /* inode number to get data for */
1129         void            __user *buffer, /* not used */
1130         int             ubsize,         /* not used */
1131         int             *ubused,        /* not used */
1132         int             *res)           /* result code value */
1133 {
1134         xfs_inode_t     *ip;
1135         xfs_qcnt_t      nblks;
1136         xfs_filblks_t   rtblks = 0;     /* total rt blks */
1137         int             error;
1138
1139         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1140
1141         /*
1142          * rootino must have its resources accounted for, not so with the quota
1143          * inodes.
1144          */
1145         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1146                 *res = BULKSTAT_RV_NOTHING;
1147                 return -EINVAL;
1148         }
1149
1150         /*
1151          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1152          * interface expects the inode to be exclusively locked because that's
1153          * the case in all other instances. It's OK that we do this because
1154          * quotacheck is done only at mount time.
1155          */
1156         error = xfs_iget(mp, NULL, ino, XFS_IGET_DONTCACHE, XFS_ILOCK_EXCL,
1157                          &ip);
1158         if (error) {
1159                 *res = BULKSTAT_RV_NOTHING;
1160                 return error;
1161         }
1162
1163         ASSERT(ip->i_delayed_blks == 0);
1164
1165         if (XFS_IS_REALTIME_INODE(ip)) {
1166                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1167
1168                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1169                         error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1170                         if (error)
1171                                 goto error0;
1172                 }
1173
1174                 xfs_bmap_count_leaves(ifp, &rtblks);
1175         }
1176
1177         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1178
1179         /*
1180          * Add the (disk blocks and inode) resources occupied by this
1181          * inode to its dquots. We do this adjustment in the incore dquot,
1182          * and also copy the changes to its buffer.
1183          * We don't care about putting these changes in a transaction
1184          * envelope because if we crash in the middle of a 'quotacheck'
1185          * we have to start from the beginning anyway.
1186          * Once we're done, we'll log all the dquot bufs.
1187          *
1188          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1189          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1190          */
1191         if (XFS_IS_UQUOTA_ON(mp)) {
1192                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1193                                                    XFS_DQ_USER, nblks, rtblks);
1194                 if (error)
1195                         goto error0;
1196         }
1197
1198         if (XFS_IS_GQUOTA_ON(mp)) {
1199                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1200                                                    XFS_DQ_GROUP, nblks, rtblks);
1201                 if (error)
1202                         goto error0;
1203         }
1204
1205         if (XFS_IS_PQUOTA_ON(mp)) {
1206                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1207                                                    XFS_DQ_PROJ, nblks, rtblks);
1208                 if (error)
1209                         goto error0;
1210         }
1211
1212         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1213         IRELE(ip);
1214         *res = BULKSTAT_RV_DIDONE;
1215         return 0;
1216
1217 error0:
1218         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1219         IRELE(ip);
1220         *res = BULKSTAT_RV_GIVEUP;
1221         return error;
1222 }
1223
1224 STATIC int
1225 xfs_qm_flush_one(
1226         struct xfs_dquot        *dqp,
1227         void                    *data)
1228 {
1229         struct xfs_mount        *mp = dqp->q_mount;
1230         struct list_head        *buffer_list = data;
1231         struct xfs_buf          *bp = NULL;
1232         int                     error = 0;
1233
1234         xfs_dqlock(dqp);
1235         if (dqp->dq_flags & XFS_DQ_FREEING)
1236                 goto out_unlock;
1237         if (!XFS_DQ_IS_DIRTY(dqp))
1238                 goto out_unlock;
1239
1240         /*
1241          * The only way the dquot is already flush locked by the time quotacheck
1242          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1243          * it for the final time. Quotacheck collects all dquot bufs in the
1244          * local delwri queue before dquots are dirtied, so reclaim can't have
1245          * possibly queued it for I/O. The only way out is to push the buffer to
1246          * cycle the flush lock.
1247          */
1248         if (!xfs_dqflock_nowait(dqp)) {
1249                 /* buf is pinned in-core by delwri list */
1250                 DEFINE_SINGLE_BUF_MAP(map, dqp->q_blkno,
1251                                       mp->m_quotainfo->qi_dqchunklen);
1252                 bp = _xfs_buf_find(mp->m_ddev_targp, &map, 1, 0, NULL);
1253                 if (!bp) {
1254                         error = -EINVAL;
1255                         goto out_unlock;
1256                 }
1257                 xfs_buf_unlock(bp);
1258
1259                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1260                 xfs_buf_rele(bp);
1261
1262                 error = -EAGAIN;
1263                 goto out_unlock;
1264         }
1265
1266         error = xfs_qm_dqflush(dqp, &bp);
1267         if (error)
1268                 goto out_unlock;
1269
1270         xfs_buf_delwri_queue(bp, buffer_list);
1271         xfs_buf_relse(bp);
1272 out_unlock:
1273         xfs_dqunlock(dqp);
1274         return error;
1275 }
1276
1277 /*
1278  * Walk thru all the filesystem inodes and construct a consistent view
1279  * of the disk quota world. If the quotacheck fails, disable quotas.
1280  */
1281 STATIC int
1282 xfs_qm_quotacheck(
1283         xfs_mount_t     *mp)
1284 {
1285         int                     done, count, error, error2;
1286         xfs_ino_t               lastino;
1287         size_t                  structsz;
1288         uint                    flags;
1289         LIST_HEAD               (buffer_list);
1290         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1291         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1292         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1293
1294         count = INT_MAX;
1295         structsz = 1;
1296         lastino = 0;
1297         flags = 0;
1298
1299         ASSERT(uip || gip || pip);
1300         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1301
1302         xfs_notice(mp, "Quotacheck needed: Please wait.");
1303
1304         /*
1305          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1306          * their counters to zero. We need a clean slate.
1307          * We don't log our changes till later.
1308          */
1309         if (uip) {
1310                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1311                                          &buffer_list);
1312                 if (error)
1313                         goto error_return;
1314                 flags |= XFS_UQUOTA_CHKD;
1315         }
1316
1317         if (gip) {
1318                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1319                                          &buffer_list);
1320                 if (error)
1321                         goto error_return;
1322                 flags |= XFS_GQUOTA_CHKD;
1323         }
1324
1325         if (pip) {
1326                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1327                                          &buffer_list);
1328                 if (error)
1329                         goto error_return;
1330                 flags |= XFS_PQUOTA_CHKD;
1331         }
1332
1333         do {
1334                 /*
1335                  * Iterate thru all the inodes in the file system,
1336                  * adjusting the corresponding dquot counters in core.
1337                  */
1338                 error = xfs_bulkstat(mp, &lastino, &count,
1339                                      xfs_qm_dqusage_adjust,
1340                                      structsz, NULL, &done);
1341                 if (error)
1342                         break;
1343
1344         } while (!done);
1345
1346         /*
1347          * We've made all the changes that we need to make incore.  Flush them
1348          * down to disk buffers if everything was updated successfully.
1349          */
1350         if (XFS_IS_UQUOTA_ON(mp)) {
1351                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1352                                           &buffer_list);
1353         }
1354         if (XFS_IS_GQUOTA_ON(mp)) {
1355                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1356                                            &buffer_list);
1357                 if (!error)
1358                         error = error2;
1359         }
1360         if (XFS_IS_PQUOTA_ON(mp)) {
1361                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1362                                            &buffer_list);
1363                 if (!error)
1364                         error = error2;
1365         }
1366
1367         error2 = xfs_buf_delwri_submit(&buffer_list);
1368         if (!error)
1369                 error = error2;
1370
1371         /*
1372          * We can get this error if we couldn't do a dquot allocation inside
1373          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1374          * dirty dquots that might be cached, we just want to get rid of them
1375          * and turn quotaoff. The dquots won't be attached to any of the inodes
1376          * at this point (because we intentionally didn't in dqget_noattach).
1377          */
1378         if (error) {
1379                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1380                 goto error_return;
1381         }
1382
1383         /*
1384          * If one type of quotas is off, then it will lose its
1385          * quotachecked status, since we won't be doing accounting for
1386          * that type anymore.
1387          */
1388         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1389         mp->m_qflags |= flags;
1390
1391  error_return:
1392         xfs_buf_delwri_cancel(&buffer_list);
1393
1394         if (error) {
1395                 xfs_warn(mp,
1396         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1397                         error);
1398                 /*
1399                  * We must turn off quotas.
1400                  */
1401                 ASSERT(mp->m_quotainfo != NULL);
1402                 xfs_qm_destroy_quotainfo(mp);
1403                 if (xfs_mount_reset_sbqflags(mp)) {
1404                         xfs_warn(mp,
1405                                 "Quotacheck: Failed to reset quota flags.");
1406                 }
1407         } else
1408                 xfs_notice(mp, "Quotacheck: Done.");
1409         return error;
1410 }
1411
1412 /*
1413  * This is called from xfs_mountfs to start quotas and initialize all
1414  * necessary data structures like quotainfo.  This is also responsible for
1415  * running a quotacheck as necessary.  We are guaranteed that the superblock
1416  * is consistently read in at this point.
1417  *
1418  * If we fail here, the mount will continue with quota turned off. We don't
1419  * need to inidicate success or failure at all.
1420  */
1421 void
1422 xfs_qm_mount_quotas(
1423         struct xfs_mount        *mp)
1424 {
1425         int                     error = 0;
1426         uint                    sbf;
1427
1428         /*
1429          * If quotas on realtime volumes is not supported, we disable
1430          * quotas immediately.
1431          */
1432         if (mp->m_sb.sb_rextents) {
1433                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1434                 mp->m_qflags = 0;
1435                 goto write_changes;
1436         }
1437
1438         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1439
1440         /*
1441          * Allocate the quotainfo structure inside the mount struct, and
1442          * create quotainode(s), and change/rev superblock if necessary.
1443          */
1444         error = xfs_qm_init_quotainfo(mp);
1445         if (error) {
1446                 /*
1447                  * We must turn off quotas.
1448                  */
1449                 ASSERT(mp->m_quotainfo == NULL);
1450                 mp->m_qflags = 0;
1451                 goto write_changes;
1452         }
1453         /*
1454          * If any of the quotas are not consistent, do a quotacheck.
1455          */
1456         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1457                 error = xfs_qm_quotacheck(mp);
1458                 if (error) {
1459                         /* Quotacheck failed and disabled quotas. */
1460                         return;
1461                 }
1462         }
1463         /*
1464          * If one type of quotas is off, then it will lose its
1465          * quotachecked status, since we won't be doing accounting for
1466          * that type anymore.
1467          */
1468         if (!XFS_IS_UQUOTA_ON(mp))
1469                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1470         if (!XFS_IS_GQUOTA_ON(mp))
1471                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1472         if (!XFS_IS_PQUOTA_ON(mp))
1473                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1474
1475  write_changes:
1476         /*
1477          * We actually don't have to acquire the m_sb_lock at all.
1478          * This can only be called from mount, and that's single threaded. XXX
1479          */
1480         spin_lock(&mp->m_sb_lock);
1481         sbf = mp->m_sb.sb_qflags;
1482         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1483         spin_unlock(&mp->m_sb_lock);
1484
1485         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1486                 if (xfs_sync_sb(mp, false)) {
1487                         /*
1488                          * We could only have been turning quotas off.
1489                          * We aren't in very good shape actually because
1490                          * the incore structures are convinced that quotas are
1491                          * off, but the on disk superblock doesn't know that !
1492                          */
1493                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1494                         xfs_alert(mp, "%s: Superblock update failed!",
1495                                 __func__);
1496                 }
1497         }
1498
1499         if (error) {
1500                 xfs_warn(mp, "Failed to initialize disk quotas.");
1501                 return;
1502         }
1503 }
1504
1505 /*
1506  * This is called after the superblock has been read in and we're ready to
1507  * iget the quota inodes.
1508  */
1509 STATIC int
1510 xfs_qm_init_quotainos(
1511         xfs_mount_t     *mp)
1512 {
1513         struct xfs_inode        *uip = NULL;
1514         struct xfs_inode        *gip = NULL;
1515         struct xfs_inode        *pip = NULL;
1516         int                     error;
1517         uint                    flags = 0;
1518
1519         ASSERT(mp->m_quotainfo);
1520
1521         /*
1522          * Get the uquota and gquota inodes
1523          */
1524         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1525                 if (XFS_IS_UQUOTA_ON(mp) &&
1526                     mp->m_sb.sb_uquotino != NULLFSINO) {
1527                         ASSERT(mp->m_sb.sb_uquotino > 0);
1528                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1529                                              0, 0, &uip);
1530                         if (error)
1531                                 return error;
1532                 }
1533                 if (XFS_IS_GQUOTA_ON(mp) &&
1534                     mp->m_sb.sb_gquotino != NULLFSINO) {
1535                         ASSERT(mp->m_sb.sb_gquotino > 0);
1536                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1537                                              0, 0, &gip);
1538                         if (error)
1539                                 goto error_rele;
1540                 }
1541                 if (XFS_IS_PQUOTA_ON(mp) &&
1542                     mp->m_sb.sb_pquotino != NULLFSINO) {
1543                         ASSERT(mp->m_sb.sb_pquotino > 0);
1544                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1545                                              0, 0, &pip);
1546                         if (error)
1547                                 goto error_rele;
1548                 }
1549         } else {
1550                 flags |= XFS_QMOPT_SBVERSION;
1551         }
1552
1553         /*
1554          * Create the three inodes, if they don't exist already. The changes
1555          * made above will get added to a transaction and logged in one of
1556          * the qino_alloc calls below.  If the device is readonly,
1557          * temporarily switch to read-write to do this.
1558          */
1559         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1560                 error = xfs_qm_qino_alloc(mp, &uip,
1561                                               flags | XFS_QMOPT_UQUOTA);
1562                 if (error)
1563                         goto error_rele;
1564
1565                 flags &= ~XFS_QMOPT_SBVERSION;
1566         }
1567         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1568                 error = xfs_qm_qino_alloc(mp, &gip,
1569                                           flags | XFS_QMOPT_GQUOTA);
1570                 if (error)
1571                         goto error_rele;
1572
1573                 flags &= ~XFS_QMOPT_SBVERSION;
1574         }
1575         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1576                 error = xfs_qm_qino_alloc(mp, &pip,
1577                                           flags | XFS_QMOPT_PQUOTA);
1578                 if (error)
1579                         goto error_rele;
1580         }
1581
1582         mp->m_quotainfo->qi_uquotaip = uip;
1583         mp->m_quotainfo->qi_gquotaip = gip;
1584         mp->m_quotainfo->qi_pquotaip = pip;
1585
1586         return 0;
1587
1588 error_rele:
1589         if (uip)
1590                 IRELE(uip);
1591         if (gip)
1592                 IRELE(gip);
1593         if (pip)
1594                 IRELE(pip);
1595         return error;
1596 }
1597
1598 STATIC void
1599 xfs_qm_destroy_quotainos(
1600         xfs_quotainfo_t *qi)
1601 {
1602         if (qi->qi_uquotaip) {
1603                 IRELE(qi->qi_uquotaip);
1604                 qi->qi_uquotaip = NULL; /* paranoia */
1605         }
1606         if (qi->qi_gquotaip) {
1607                 IRELE(qi->qi_gquotaip);
1608                 qi->qi_gquotaip = NULL;
1609         }
1610         if (qi->qi_pquotaip) {
1611                 IRELE(qi->qi_pquotaip);
1612                 qi->qi_pquotaip = NULL;
1613         }
1614 }
1615
1616 STATIC void
1617 xfs_qm_dqfree_one(
1618         struct xfs_dquot        *dqp)
1619 {
1620         struct xfs_mount        *mp = dqp->q_mount;
1621         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1622
1623         mutex_lock(&qi->qi_tree_lock);
1624         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1625                           be32_to_cpu(dqp->q_core.d_id));
1626
1627         qi->qi_dquots--;
1628         mutex_unlock(&qi->qi_tree_lock);
1629
1630         xfs_qm_dqdestroy(dqp);
1631 }
1632
1633 /* --------------- utility functions for vnodeops ---------------- */
1634
1635
1636 /*
1637  * Given an inode, a uid, gid and prid make sure that we have
1638  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1639  * quotas by creating this file.
1640  * This also attaches dquot(s) to the given inode after locking it,
1641  * and returns the dquots corresponding to the uid and/or gid.
1642  *
1643  * in   : inode (unlocked)
1644  * out  : udquot, gdquot with references taken and unlocked
1645  */
1646 int
1647 xfs_qm_vop_dqalloc(
1648         struct xfs_inode        *ip,
1649         xfs_dqid_t              uid,
1650         xfs_dqid_t              gid,
1651         prid_t                  prid,
1652         uint                    flags,
1653         struct xfs_dquot        **O_udqpp,
1654         struct xfs_dquot        **O_gdqpp,
1655         struct xfs_dquot        **O_pdqpp)
1656 {
1657         struct xfs_mount        *mp = ip->i_mount;
1658         struct xfs_dquot        *uq = NULL;
1659         struct xfs_dquot        *gq = NULL;
1660         struct xfs_dquot        *pq = NULL;
1661         int                     error;
1662         uint                    lockflags;
1663
1664         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1665                 return 0;
1666
1667         lockflags = XFS_ILOCK_EXCL;
1668         xfs_ilock(ip, lockflags);
1669
1670         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1671                 gid = ip->i_d.di_gid;
1672
1673         /*
1674          * Attach the dquot(s) to this inode, doing a dquot allocation
1675          * if necessary. The dquot(s) will not be locked.
1676          */
1677         if (XFS_NOT_DQATTACHED(mp, ip)) {
1678                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1679                 if (error) {
1680                         xfs_iunlock(ip, lockflags);
1681                         return error;
1682                 }
1683         }
1684
1685         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1686                 if (ip->i_d.di_uid != uid) {
1687                         /*
1688                          * What we need is the dquot that has this uid, and
1689                          * if we send the inode to dqget, the uid of the inode
1690                          * takes priority over what's sent in the uid argument.
1691                          * We must unlock inode here before calling dqget if
1692                          * we're not sending the inode, because otherwise
1693                          * we'll deadlock by doing trans_reserve while
1694                          * holding ilock.
1695                          */
1696                         xfs_iunlock(ip, lockflags);
1697                         error = xfs_qm_dqget(mp, NULL, uid,
1698                                                  XFS_DQ_USER,
1699                                                  XFS_QMOPT_DQALLOC,
1700                                                  &uq);
1701                         if (error) {
1702                                 ASSERT(error != -ENOENT);
1703                                 return error;
1704                         }
1705                         /*
1706                          * Get the ilock in the right order.
1707                          */
1708                         xfs_dqunlock(uq);
1709                         lockflags = XFS_ILOCK_SHARED;
1710                         xfs_ilock(ip, lockflags);
1711                 } else {
1712                         /*
1713                          * Take an extra reference, because we'll return
1714                          * this to caller
1715                          */
1716                         ASSERT(ip->i_udquot);
1717                         uq = xfs_qm_dqhold(ip->i_udquot);
1718                 }
1719         }
1720         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1721                 if (ip->i_d.di_gid != gid) {
1722                         xfs_iunlock(ip, lockflags);
1723                         error = xfs_qm_dqget(mp, NULL, gid,
1724                                                  XFS_DQ_GROUP,
1725                                                  XFS_QMOPT_DQALLOC,
1726                                                  &gq);
1727                         if (error) {
1728                                 ASSERT(error != -ENOENT);
1729                                 goto error_rele;
1730                         }
1731                         xfs_dqunlock(gq);
1732                         lockflags = XFS_ILOCK_SHARED;
1733                         xfs_ilock(ip, lockflags);
1734                 } else {
1735                         ASSERT(ip->i_gdquot);
1736                         gq = xfs_qm_dqhold(ip->i_gdquot);
1737                 }
1738         }
1739         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1740                 if (xfs_get_projid(ip) != prid) {
1741                         xfs_iunlock(ip, lockflags);
1742                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1743                                                  XFS_DQ_PROJ,
1744                                                  XFS_QMOPT_DQALLOC,
1745                                                  &pq);
1746                         if (error) {
1747                                 ASSERT(error != -ENOENT);
1748                                 goto error_rele;
1749                         }
1750                         xfs_dqunlock(pq);
1751                         lockflags = XFS_ILOCK_SHARED;
1752                         xfs_ilock(ip, lockflags);
1753                 } else {
1754                         ASSERT(ip->i_pdquot);
1755                         pq = xfs_qm_dqhold(ip->i_pdquot);
1756                 }
1757         }
1758         if (uq)
1759                 trace_xfs_dquot_dqalloc(ip);
1760
1761         xfs_iunlock(ip, lockflags);
1762         if (O_udqpp)
1763                 *O_udqpp = uq;
1764         else
1765                 xfs_qm_dqrele(uq);
1766         if (O_gdqpp)
1767                 *O_gdqpp = gq;
1768         else
1769                 xfs_qm_dqrele(gq);
1770         if (O_pdqpp)
1771                 *O_pdqpp = pq;
1772         else
1773                 xfs_qm_dqrele(pq);
1774         return 0;
1775
1776 error_rele:
1777         xfs_qm_dqrele(gq);
1778         xfs_qm_dqrele(uq);
1779         return error;
1780 }
1781
1782 /*
1783  * Actually transfer ownership, and do dquot modifications.
1784  * These were already reserved.
1785  */
1786 xfs_dquot_t *
1787 xfs_qm_vop_chown(
1788         xfs_trans_t     *tp,
1789         xfs_inode_t     *ip,
1790         xfs_dquot_t     **IO_olddq,
1791         xfs_dquot_t     *newdq)
1792 {
1793         xfs_dquot_t     *prevdq;
1794         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1795                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1796
1797
1798         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1799         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1800
1801         /* old dquot */
1802         prevdq = *IO_olddq;
1803         ASSERT(prevdq);
1804         ASSERT(prevdq != newdq);
1805
1806         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1807         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1808
1809         /* the sparkling new dquot */
1810         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1811         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1812
1813         /*
1814          * Take an extra reference, because the inode is going to keep
1815          * this dquot pointer even after the trans_commit.
1816          */
1817         *IO_olddq = xfs_qm_dqhold(newdq);
1818
1819         return prevdq;
1820 }
1821
1822 /*
1823  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1824  */
1825 int
1826 xfs_qm_vop_chown_reserve(
1827         struct xfs_trans        *tp,
1828         struct xfs_inode        *ip,
1829         struct xfs_dquot        *udqp,
1830         struct xfs_dquot        *gdqp,
1831         struct xfs_dquot        *pdqp,
1832         uint                    flags)
1833 {
1834         struct xfs_mount        *mp = ip->i_mount;
1835         uint                    delblks, blkflags, prjflags = 0;
1836         struct xfs_dquot        *udq_unres = NULL;
1837         struct xfs_dquot        *gdq_unres = NULL;
1838         struct xfs_dquot        *pdq_unres = NULL;
1839         struct xfs_dquot        *udq_delblks = NULL;
1840         struct xfs_dquot        *gdq_delblks = NULL;
1841         struct xfs_dquot        *pdq_delblks = NULL;
1842         int                     error;
1843
1844
1845         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1846         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1847
1848         delblks = ip->i_delayed_blks;
1849         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1850                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1851
1852         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1853             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1854                 udq_delblks = udqp;
1855                 /*
1856                  * If there are delayed allocation blocks, then we have to
1857                  * unreserve those from the old dquot, and add them to the
1858                  * new dquot.
1859                  */
1860                 if (delblks) {
1861                         ASSERT(ip->i_udquot);
1862                         udq_unres = ip->i_udquot;
1863                 }
1864         }
1865         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1866             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1867                 gdq_delblks = gdqp;
1868                 if (delblks) {
1869                         ASSERT(ip->i_gdquot);
1870                         gdq_unres = ip->i_gdquot;
1871                 }
1872         }
1873
1874         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1875             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1876                 prjflags = XFS_QMOPT_ENOSPC;
1877                 pdq_delblks = pdqp;
1878                 if (delblks) {
1879                         ASSERT(ip->i_pdquot);
1880                         pdq_unres = ip->i_pdquot;
1881                 }
1882         }
1883
1884         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1885                                 udq_delblks, gdq_delblks, pdq_delblks,
1886                                 ip->i_d.di_nblocks, 1,
1887                                 flags | blkflags | prjflags);
1888         if (error)
1889                 return error;
1890
1891         /*
1892          * Do the delayed blks reservations/unreservations now. Since, these
1893          * are done without the help of a transaction, if a reservation fails
1894          * its previous reservations won't be automatically undone by trans
1895          * code. So, we have to do it manually here.
1896          */
1897         if (delblks) {
1898                 /*
1899                  * Do the reservations first. Unreservation can't fail.
1900                  */
1901                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1902                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1903                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1904                             udq_delblks, gdq_delblks, pdq_delblks,
1905                             (xfs_qcnt_t)delblks, 0,
1906                             flags | blkflags | prjflags);
1907                 if (error)
1908                         return error;
1909                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1910                                 udq_unres, gdq_unres, pdq_unres,
1911                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1912         }
1913
1914         return 0;
1915 }
1916
1917 int
1918 xfs_qm_vop_rename_dqattach(
1919         struct xfs_inode        **i_tab)
1920 {
1921         struct xfs_mount        *mp = i_tab[0]->i_mount;
1922         int                     i;
1923
1924         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1925                 return 0;
1926
1927         for (i = 0; (i < 4 && i_tab[i]); i++) {
1928                 struct xfs_inode        *ip = i_tab[i];
1929                 int                     error;
1930
1931                 /*
1932                  * Watch out for duplicate entries in the table.
1933                  */
1934                 if (i == 0 || ip != i_tab[i-1]) {
1935                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1936                                 error = xfs_qm_dqattach(ip, 0);
1937                                 if (error)
1938                                         return error;
1939                         }
1940                 }
1941         }
1942         return 0;
1943 }
1944
1945 void
1946 xfs_qm_vop_create_dqattach(
1947         struct xfs_trans        *tp,
1948         struct xfs_inode        *ip,
1949         struct xfs_dquot        *udqp,
1950         struct xfs_dquot        *gdqp,
1951         struct xfs_dquot        *pdqp)
1952 {
1953         struct xfs_mount        *mp = tp->t_mountp;
1954
1955         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1956                 return;
1957
1958         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1959         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1960
1961         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1962                 ASSERT(ip->i_udquot == NULL);
1963                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1964
1965                 ip->i_udquot = xfs_qm_dqhold(udqp);
1966                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1967         }
1968         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1969                 ASSERT(ip->i_gdquot == NULL);
1970                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1971                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1972                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1973         }
1974         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1975                 ASSERT(ip->i_pdquot == NULL);
1976                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1977
1978                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1979                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1980         }
1981 }
1982