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_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_inode.h"
  29 #include "xfs_ialloc.h"
  30 #include "xfs_itable.h"
  31 #include "xfs_quota.h"
  32 #include "xfs_error.h"
  33 #include "xfs_bmap.h"
  34 #include "xfs_bmap_btree.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 #include "xfs_dinode.h"
  42
  43 /*
  44  * The global quota manager. There is only one of these for the entire
  45  * system, _not_ one per file system. XQM keeps track of the overall
  46  * quota functionality, including maintaining the freelist and hash
  47  * tables of dquots.
  48  */
  49 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  50 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  51
  52
  53 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  54 /*
  55  * We use the batch lookup interface to iterate over the dquots as it
  56  * currently is the only interface into the radix tree code that allows
  57  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  58  * operations is fine as all callers are used either during mount/umount
  59  * or quotaoff.
  60  */
  61 #define XFS_DQ_LOOKUP_BATCH     32
  62
  63 STATIC int
  64 xfs_qm_dquot_walk(
  65         struct xfs_mount        *mp,
  66         int                     type,
  67         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  68         void                    *data)
  69 {
  70         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  71         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  72         uint32_t                next_index;
  73         int                     last_error = 0;
  74         int                     skipped;
  75         int                     nr_found;
  76
  77 restart:
  78         skipped = 0;
  79         next_index = 0;
  80         nr_found = 0;
  81
  82         while (1) {
  83                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  84                 int             error = 0;
  85                 int             i;
  86
  87                 mutex_lock(&qi->qi_tree_lock);
  88                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  89                                         next_index, XFS_DQ_LOOKUP_BATCH);
  90                 if (!nr_found) {
  91                         mutex_unlock(&qi->qi_tree_lock);
  92                         break;
  93                 }
  94
  95                 for (i = 0; i < nr_found; i++) {
  96                         struct xfs_dquot *dqp = batch[i];
  97
  98                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  99
 100                         error = execute(batch[i], data);
 101                         if (error == -EAGAIN) {
 102                                 skipped++;
 103                                 continue;
 104                         }
 105                         if (error && last_error != -EFSCORRUPTED)
 106                                 last_error = error;
 107                 }
 108
 109                 mutex_unlock(&qi->qi_tree_lock);
 110
 111                 /* bail out if the filesystem is corrupted.  */
 112                 if (last_error == -EFSCORRUPTED) {
 113                         skipped = 0;
 114                         break;
 115                 }
 116         }
 117
 118         if (skipped) {
 119                 delay(1);
 120                 goto restart;
 121         }
 122
 123         return last_error;
 124 }
 125
 126
 127 /*
 128  * Purge a dquot from all tracking data structures and free it.
 129  */
 130 STATIC int
 131 xfs_qm_dqpurge(
 132         struct xfs_dquot        *dqp,
 133         void                    *data)
 134 {
 135         struct xfs_mount        *mp = dqp->q_mount;
 136         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 137
 138         xfs_dqlock(dqp);
 139         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 140                 xfs_dqunlock(dqp);
 141                 return -EAGAIN;
 142         }
 143
 144         dqp->dq_flags |= XFS_DQ_FREEING;
 145
 146         xfs_dqflock(dqp);
 147
 148         /*
 149          * If we are turning this type of quotas off, we don't care
 150          * about the dirty metadata sitting in this dquot. OTOH, if
 151          * we're unmounting, we do care, so we flush it and wait.
 152          */
 153         if (XFS_DQ_IS_DIRTY(dqp)) {
 154                 struct xfs_buf  *bp = NULL;
 155                 int             error;
 156
 157                 /*
 158                  * We don't care about getting disk errors here. We need
 159                  * to purge this dquot anyway, so we go ahead regardless.
 160                  */
 161                 error = xfs_qm_dqflush(dqp, &bp);
 162                 if (error) {
 163                         xfs_warn(mp, "%s: dquot %p flush failed",
 164                                 __func__, dqp);
 165                 } else {
 166                         error = xfs_bwrite(bp);
 167                         xfs_buf_relse(bp);
 168                 }
 169                 xfs_dqflock(dqp);
 170         }
 171
 172         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 173         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 174                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 175
 176         xfs_dqfunlock(dqp);
 177         xfs_dqunlock(dqp);
 178
 179         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 180                           be32_to_cpu(dqp->q_core.d_id));
 181         qi->qi_dquots--;
 182
 183         /*
 184          * We move dquots to the freelist as soon as their reference count
 185          * hits zero, so it really should be on the freelist here.
 186          */
 187         ASSERT(!list_empty(&dqp->q_lru));
 188         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 189         XFS_STATS_DEC(xs_qm_dquot_unused);
 190
 191         xfs_qm_dqdestroy(dqp);
 192         return 0;
 193 }
 194
 195 /*
 196  * Purge the dquot cache.
 197  */
 198 void
 199 xfs_qm_dqpurge_all(
 200         struct xfs_mount        *mp,
 201         uint                    flags)
 202 {
 203         if (flags & XFS_QMOPT_UQUOTA)
 204                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 205         if (flags & XFS_QMOPT_GQUOTA)
 206                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 207         if (flags & XFS_QMOPT_PQUOTA)
 208                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 209 }
 210
 211 /*
 212  * Just destroy the quotainfo structure.
 213  */
 214 void
 215 xfs_qm_unmount(
 216         struct xfs_mount        *mp)
 217 {
 218         if (mp->m_quotainfo) {
 219                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 220                 xfs_qm_destroy_quotainfo(mp);
 221         }
 222 }
 223
 224 /*
 225  * Called from the vfsops layer.
 226  */
 227 void
 228 xfs_qm_unmount_quotas(
 229         xfs_mount_t     *mp)
 230 {
 231         /*
 232          * Release the dquots that root inode, et al might be holding,
 233          * before we flush quotas and blow away the quotainfo structure.
 234          */
 235         ASSERT(mp->m_rootip);
 236         xfs_qm_dqdetach(mp->m_rootip);
 237         if (mp->m_rbmip)
 238                 xfs_qm_dqdetach(mp->m_rbmip);
 239         if (mp->m_rsumip)
 240                 xfs_qm_dqdetach(mp->m_rsumip);
 241
 242         /*
 243          * Release the quota inodes.
 244          */
 245         if (mp->m_quotainfo) {
 246                 if (mp->m_quotainfo->qi_uquotaip) {
 247                         IRELE(mp->m_quotainfo->qi_uquotaip);
 248                         mp->m_quotainfo->qi_uquotaip = NULL;
 249                 }
 250                 if (mp->m_quotainfo->qi_gquotaip) {
 251                         IRELE(mp->m_quotainfo->qi_gquotaip);
 252                         mp->m_quotainfo->qi_gquotaip = NULL;
 253                 }
 254                 if (mp->m_quotainfo->qi_pquotaip) {
 255                         IRELE(mp->m_quotainfo->qi_pquotaip);
 256                         mp->m_quotainfo->qi_pquotaip = NULL;
 257                 }
 258         }
 259 }
 260
 261 STATIC int
 262 xfs_qm_dqattach_one(
 263         xfs_inode_t     *ip,
 264         xfs_dqid_t      id,
 265         uint            type,
 266         uint            doalloc,
 267         xfs_dquot_t     **IO_idqpp)
 268 {
 269         xfs_dquot_t     *dqp;
 270         int             error;
 271
 272         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 273         error = 0;
 274
 275         /*
 276          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 277          * or &i_gdquot. This made the code look weird, but made the logic a lot
 278          * simpler.
 279          */
 280         dqp = *IO_idqpp;
 281         if (dqp) {
 282                 trace_xfs_dqattach_found(dqp);
 283                 return 0;
 284         }
 285
 286         /*
 287          * Find the dquot from somewhere. This bumps the reference count of
 288          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 289          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 290          * turned off suddenly.
 291          */
 292         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 293                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 294         if (error)
 295                 return error;
 296
 297         trace_xfs_dqattach_get(dqp);
 298
 299         /*
 300          * dqget may have dropped and re-acquired the ilock, but it guarantees
 301          * that the dquot returned is the one that should go in the inode.
 302          */
 303         *IO_idqpp = dqp;
 304         xfs_dqunlock(dqp);
 305         return 0;
 306 }
 307
 308 static bool
 309 xfs_qm_need_dqattach(
 310         struct xfs_inode        *ip)
 311 {
 312         struct xfs_mount        *mp = ip->i_mount;
 313
 314         if (!XFS_IS_QUOTA_RUNNING(mp))
 315                 return false;
 316         if (!XFS_IS_QUOTA_ON(mp))
 317                 return false;
 318         if (!XFS_NOT_DQATTACHED(mp, ip))
 319                 return false;
 320         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 321                 return false;
 322         return true;
 323 }
 324
 325 /*
 326  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 327  * into account.
 328  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 329  * Inode may get unlocked and relocked in here, and the caller must deal with
 330  * the consequences.
 331  */
 332 int
 333 xfs_qm_dqattach_locked(
 334         xfs_inode_t     *ip,
 335         uint            flags)
 336 {
 337         xfs_mount_t     *mp = ip->i_mount;
 338         int             error = 0;
 339
 340         if (!xfs_qm_need_dqattach(ip))
 341                 return 0;
 342
 343         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 344
 345         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 346                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 347                                                 flags & XFS_QMOPT_DQALLOC,
 348                                                 &ip->i_udquot);
 349                 if (error)
 350                         goto done;
 351                 ASSERT(ip->i_udquot);
 352         }
 353
 354         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 355                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 356                                                 flags & XFS_QMOPT_DQALLOC,
 357                                                 &ip->i_gdquot);
 358                 if (error)
 359                         goto done;
 360                 ASSERT(ip->i_gdquot);
 361         }
 362
 363         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 364                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 365                                                 flags & XFS_QMOPT_DQALLOC,
 366                                                 &ip->i_pdquot);
 367                 if (error)
 368                         goto done;
 369                 ASSERT(ip->i_pdquot);
 370         }
 371
 372 done:
 373         /*
 374          * Don't worry about the dquots that we may have attached before any
 375          * error - they'll get detached later if it has not already been done.
 376          */
 377         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 378         return error;
 379 }
 380
 381 int
 382 xfs_qm_dqattach(
 383         struct xfs_inode        *ip,
 384         uint                    flags)
 385 {
 386         int                     error;
 387
 388         if (!xfs_qm_need_dqattach(ip))
 389                 return 0;
 390
 391         xfs_ilock(ip, XFS_ILOCK_EXCL);
 392         error = xfs_qm_dqattach_locked(ip, flags);
 393         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 394
 395         return error;
 396 }
 397
 398 /*
 399  * Release dquots (and their references) if any.
 400  * The inode should be locked EXCL except when this's called by
 401  * xfs_ireclaim.
 402  */
 403 void
 404 xfs_qm_dqdetach(
 405         xfs_inode_t     *ip)
 406 {
 407         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 408                 return;
 409
 410         trace_xfs_dquot_dqdetach(ip);
 411
 412         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 413         if (ip->i_udquot) {
 414                 xfs_qm_dqrele(ip->i_udquot);
 415                 ip->i_udquot = NULL;
 416         }
 417         if (ip->i_gdquot) {
 418                 xfs_qm_dqrele(ip->i_gdquot);
 419                 ip->i_gdquot = NULL;
 420         }
 421         if (ip->i_pdquot) {
 422                 xfs_qm_dqrele(ip->i_pdquot);
 423                 ip->i_pdquot = NULL;
 424         }
 425 }
 426
 427 struct xfs_qm_isolate {
 428         struct list_head        buffers;
 429         struct list_head        dispose;
 430 };
 431
 432 static enum lru_status
 433 xfs_qm_dquot_isolate(
 434         struct list_head        *item,
 435         spinlock_t              *lru_lock,
 436         void                    *arg)
 437 {
 438         struct xfs_dquot        *dqp = container_of(item,
 439                                                 struct xfs_dquot, q_lru);
 440         struct xfs_qm_isolate   *isol = arg;
 441
 442         if (!xfs_dqlock_nowait(dqp))
 443                 goto out_miss_busy;
 444
 445         /*
 446          * This dquot has acquired a reference in the meantime remove it from
 447          * the freelist and try again.
 448          */
 449         if (dqp->q_nrefs) {
 450                 xfs_dqunlock(dqp);
 451                 XFS_STATS_INC(xs_qm_dqwants);
 452
 453                 trace_xfs_dqreclaim_want(dqp);
 454                 list_del_init(&dqp->q_lru);
 455                 XFS_STATS_DEC(xs_qm_dquot_unused);
 456                 return LRU_REMOVED;
 457         }
 458
 459         /*
 460          * If the dquot is dirty, flush it. If it's already being flushed, just
 461          * skip it so there is time for the IO to complete before we try to
 462          * reclaim it again on the next LRU pass.
 463          */
 464         if (!xfs_dqflock_nowait(dqp)) {
 465                 xfs_dqunlock(dqp);
 466                 goto out_miss_busy;
 467         }
 468
 469         if (XFS_DQ_IS_DIRTY(dqp)) {
 470                 struct xfs_buf  *bp = NULL;
 471                 int             error;
 472
 473                 trace_xfs_dqreclaim_dirty(dqp);
 474
 475                 /* we have to drop the LRU lock to flush the dquot */
 476                 spin_unlock(lru_lock);
 477
 478                 error = xfs_qm_dqflush(dqp, &bp);
 479                 if (error) {
 480                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 481                                  __func__, dqp);
 482                         goto out_unlock_dirty;
 483                 }
 484
 485                 xfs_buf_delwri_queue(bp, &isol->buffers);
 486                 xfs_buf_relse(bp);
 487                 goto out_unlock_dirty;
 488         }
 489         xfs_dqfunlock(dqp);
 490
 491         /*
 492          * Prevent lookups now that we are past the point of no return.
 493          */
 494         dqp->dq_flags |= XFS_DQ_FREEING;
 495         xfs_dqunlock(dqp);
 496
 497         ASSERT(dqp->q_nrefs == 0);
 498         list_move_tail(&dqp->q_lru, &isol->dispose);
 499         XFS_STATS_DEC(xs_qm_dquot_unused);
 500         trace_xfs_dqreclaim_done(dqp);
 501         XFS_STATS_INC(xs_qm_dqreclaims);
 502         return LRU_REMOVED;
 503
 504 out_miss_busy:
 505         trace_xfs_dqreclaim_busy(dqp);
 506         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 507         return LRU_SKIP;
 508
 509 out_unlock_dirty:
 510         trace_xfs_dqreclaim_busy(dqp);
 511         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 512         xfs_dqunlock(dqp);
 513         spin_lock(lru_lock);
 514         return LRU_RETRY;
 515 }
 516
 517 static unsigned long
 518 xfs_qm_shrink_scan(
 519         struct shrinker         *shrink,
 520         struct shrink_control   *sc)
 521 {
 522         struct xfs_quotainfo    *qi = container_of(shrink,
 523                                         struct xfs_quotainfo, qi_shrinker);
 524         struct xfs_qm_isolate   isol;
 525         unsigned long           freed;
 526         int                     error;
 527         unsigned long           nr_to_scan = sc->nr_to_scan;
 528
 529         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
 530                 return 0;
 531
 532         INIT_LIST_HEAD(&isol.buffers);
 533         INIT_LIST_HEAD(&isol.dispose);
 534
 535         freed = list_lru_walk_node(&qi->qi_lru, sc->nid, xfs_qm_dquot_isolate, &isol,
 536                                         &nr_to_scan);
 537
 538         error = xfs_buf_delwri_submit(&isol.buffers);
 539         if (error)
 540                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 541
 542         while (!list_empty(&isol.dispose)) {
 543                 struct xfs_dquot        *dqp;
 544
 545                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 546                 list_del_init(&dqp->q_lru);
 547                 xfs_qm_dqfree_one(dqp);
 548         }
 549
 550         return freed;
 551 }
 552
 553 static unsigned long
 554 xfs_qm_shrink_count(
 555         struct shrinker         *shrink,
 556         struct shrink_control   *sc)
 557 {
 558         struct xfs_quotainfo    *qi = container_of(shrink,
 559                                         struct xfs_quotainfo, qi_shrinker);
 560
 561         return list_lru_count_node(&qi->qi_lru, sc->nid);
 562 }
 563
 564 /*
 565  * This initializes all the quota information that's kept in the
 566  * mount structure
 567  */
 568 STATIC int
 569 xfs_qm_init_quotainfo(
 570         xfs_mount_t     *mp)
 571 {
 572         xfs_quotainfo_t *qinf;
 573         int             error;
 574         xfs_dquot_t     *dqp;
 575
 576         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 577
 578         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 579
 580         error = list_lru_init(&qinf->qi_lru);
 581         if (error)
 582                 goto out_free_qinf;
 583
 584         /*
 585          * See if quotainodes are setup, and if not, allocate them,
 586          * and change the superblock accordingly.
 587          */
 588         error = xfs_qm_init_quotainos(mp);
 589         if (error)
 590                 goto out_free_lru;
 591
 592         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 593         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 594         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 595         mutex_init(&qinf->qi_tree_lock);
 596
 597         /* mutex used to serialize quotaoffs */
 598         mutex_init(&qinf->qi_quotaofflock);
 599
 600         /* Precalc some constants */
 601         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 602         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 603
 604         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 605
 606         /*
 607          * We try to get the limits from the superuser's limits fields.
 608          * This is quite hacky, but it is standard quota practice.
 609          *
 610          * We look at the USR dquot with id == 0 first, but if user quotas
 611          * are not enabled we goto the GRP dquot with id == 0.
 612          * We don't really care to keep separate default limits for user
 613          * and group quotas, at least not at this point.
 614          *
 615          * Since we may not have done a quotacheck by this point, just read
 616          * the dquot without attaching it to any hashtables or lists.
 617          */
 618         error = xfs_qm_dqread(mp, 0,
 619                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 620                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 621                           XFS_DQ_PROJ),
 622                         XFS_QMOPT_DOWARN, &dqp);
 623         if (!error) {
 624                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 625
 626                 /*
 627                  * The warnings and timers set the grace period given to
 628                  * a user or group before he or she can not perform any
 629                  * more writing. If it is zero, a default is used.
 630                  */
 631                 qinf->qi_btimelimit = ddqp->d_btimer ?
 632                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 633                 qinf->qi_itimelimit = ddqp->d_itimer ?
 634                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 635                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 636                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 637                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 638                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 639                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 640                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 641                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 642                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 643                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 644                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 645                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 646                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 647                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 648                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 649
 650                 xfs_qm_dqdestroy(dqp);
 651         } else {
 652                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 653                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 654                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 655                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 656                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 657                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 658         }
 659
 660         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 661         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 662         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 663         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 664         register_shrinker(&qinf->qi_shrinker);
 665         return 0;
 666
 667 out_free_lru:
 668         list_lru_destroy(&qinf->qi_lru);
 669 out_free_qinf:
 670         kmem_free(qinf);
 671         mp->m_quotainfo = NULL;
 672         return error;
 673 }
 674
 675
 676 /*
 677  * Gets called when unmounting a filesystem or when all quotas get
 678  * turned off.
 679  * This purges the quota inodes, destroys locks and frees itself.
 680  */
 681 void
 682 xfs_qm_destroy_quotainfo(
 683         xfs_mount_t     *mp)
 684 {
 685         xfs_quotainfo_t *qi;
 686
 687         qi = mp->m_quotainfo;
 688         ASSERT(qi != NULL);
 689
 690         unregister_shrinker(&qi->qi_shrinker);
 691         list_lru_destroy(&qi->qi_lru);
 692
 693         if (qi->qi_uquotaip) {
 694                 IRELE(qi->qi_uquotaip);
 695                 qi->qi_uquotaip = NULL; /* paranoia */
 696         }
 697         if (qi->qi_gquotaip) {
 698                 IRELE(qi->qi_gquotaip);
 699                 qi->qi_gquotaip = NULL;
 700         }
 701         if (qi->qi_pquotaip) {
 702                 IRELE(qi->qi_pquotaip);
 703                 qi->qi_pquotaip = NULL;
 704         }
 705         mutex_destroy(&qi->qi_quotaofflock);
 706         kmem_free(qi);
 707         mp->m_quotainfo = NULL;
 708 }
 709
 710 /*
 711  * Create an inode and return with a reference already taken, but unlocked
 712  * This is how we create quota inodes
 713  */
 714 STATIC int
 715 xfs_qm_qino_alloc(
 716         xfs_mount_t     *mp,
 717         xfs_inode_t     **ip,
 718         __int64_t       sbfields,
 719         uint            flags)
 720 {
 721         xfs_trans_t     *tp;
 722         int             error;
 723         int             committed;
 724
 725         *ip = NULL;
 726         /*
 727          * With superblock that doesn't have separate pquotino, we
 728          * share an inode between gquota and pquota. If the on-disk
 729          * superblock has GQUOTA and the filesystem is now mounted
 730          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 731          * vice-versa.
 732          */
 733         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 734                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 735                 xfs_ino_t ino = NULLFSINO;
 736
 737                 if ((flags & XFS_QMOPT_PQUOTA) &&
 738                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 739                         ino = mp->m_sb.sb_gquotino;
 740                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 741                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 742                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 743                         ino = mp->m_sb.sb_pquotino;
 744                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 745                 }
 746                 if (ino != NULLFSINO) {
 747                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 748                         if (error)
 749                                 return error;
 750                         mp->m_sb.sb_gquotino = NULLFSINO;
 751                         mp->m_sb.sb_pquotino = NULLFSINO;
 752                 }
 753         }
 754
 755         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 756         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 757                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 758         if (error) {
 759                 xfs_trans_cancel(tp, 0);
 760                 return error;
 761         }
 762
 763         if (!*ip) {
 764                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 765                                                                 &committed);
 766                 if (error) {
 767                         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 768                                          XFS_TRANS_ABORT);
 769                         return error;
 770                 }
 771         }
 772
 773         /*
 774          * Make the changes in the superblock, and log those too.
 775          * sbfields arg may contain fields other than *QUOTINO;
 776          * VERSIONNUM for example.
 777          */
 778         spin_lock(&mp->m_sb_lock);
 779         if (flags & XFS_QMOPT_SBVERSION) {
 780                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 781                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 782                         XFS_SB_GQUOTINO | XFS_SB_PQUOTINO | XFS_SB_QFLAGS)) ==
 783                                 (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 784                                  XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
 785                                  XFS_SB_QFLAGS));
 786
 787                 xfs_sb_version_addquota(&mp->m_sb);
 788                 mp->m_sb.sb_uquotino = NULLFSINO;
 789                 mp->m_sb.sb_gquotino = NULLFSINO;
 790                 mp->m_sb.sb_pquotino = NULLFSINO;
 791
 792                 /* qflags will get updated fully _after_ quotacheck */
 793                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 794         }
 795         if (flags & XFS_QMOPT_UQUOTA)
 796                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 797         else if (flags & XFS_QMOPT_GQUOTA)
 798                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 799         else
 800                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 801         spin_unlock(&mp->m_sb_lock);
 802         xfs_mod_sb(tp, sbfields);
 803
 804         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 805                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 806                 return error;
 807         }
 808         return 0;
 809 }
 810
 811
 812 STATIC void
 813 xfs_qm_reset_dqcounts(
 814         xfs_mount_t     *mp,
 815         xfs_buf_t       *bp,
 816         xfs_dqid_t      id,
 817         uint            type)
 818 {
 819         struct xfs_dqblk        *dqb;
 820         int                     j;
 821
 822         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 823
 824         /*
 825          * Reset all counters and timers. They'll be
 826          * started afresh by xfs_qm_quotacheck.
 827          */
 828 #ifdef DEBUG
 829         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 830         do_div(j, sizeof(xfs_dqblk_t));
 831         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 832 #endif
 833         dqb = bp->b_addr;
 834         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 835                 struct xfs_disk_dquot   *ddq;
 836
 837                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 838
 839                 /*
 840                  * Do a sanity check, and if needed, repair the dqblk. Don't
 841                  * output any warnings because it's perfectly possible to
 842                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 843                  */
 844                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 845                             "xfs_quotacheck");
 846                 ddq->d_bcount = 0;
 847                 ddq->d_icount = 0;
 848                 ddq->d_rtbcount = 0;
 849                 ddq->d_btimer = 0;
 850                 ddq->d_itimer = 0;
 851                 ddq->d_rtbtimer = 0;
 852                 ddq->d_bwarns = 0;
 853                 ddq->d_iwarns = 0;
 854                 ddq->d_rtbwarns = 0;
 855
 856                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 857                         xfs_update_cksum((char *)&dqb[j],
 858                                          sizeof(struct xfs_dqblk),
 859                                          XFS_DQUOT_CRC_OFF);
 860                 }
 861         }
 862 }
 863
 864 STATIC int
 865 xfs_qm_dqiter_bufs(
 866         struct xfs_mount        *mp,
 867         xfs_dqid_t              firstid,
 868         xfs_fsblock_t           bno,
 869         xfs_filblks_t           blkcnt,
 870         uint                    flags,
 871         struct list_head        *buffer_list)
 872 {
 873         struct xfs_buf          *bp;
 874         int                     error;
 875         int                     type;
 876
 877         ASSERT(blkcnt > 0);
 878         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 879                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 880         error = 0;
 881
 882         /*
 883          * Blkcnt arg can be a very big number, and might even be
 884          * larger than the log itself. So, we have to break it up into
 885          * manageable-sized transactions.
 886          * Note that we don't start a permanent transaction here; we might
 887          * not be able to get a log reservation for the whole thing up front,
 888          * and we don't really care to either, because we just discard
 889          * everything if we were to crash in the middle of this loop.
 890          */
 891         while (blkcnt--) {
 892                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 893                               XFS_FSB_TO_DADDR(mp, bno),
 894                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 895                               &xfs_dquot_buf_ops);
 896
 897                 /*
 898                  * CRC and validation errors will return a EFSCORRUPTED here. If
 899                  * this occurs, re-read without CRC validation so that we can
 900                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 901                  * will leave a trace in the log indicating corruption has
 902                  * been detected.
 903                  */
 904                 if (error == -EFSCORRUPTED) {
 905                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 906                                       XFS_FSB_TO_DADDR(mp, bno),
 907                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 908                                       NULL);
 909                 }
 910
 911                 if (error)
 912                         break;
 913
 914                 /*
 915                  * A corrupt buffer might not have a verifier attached, so
 916                  * make sure we have the correct one attached before writeback
 917                  * occurs.
 918                  */
 919                 bp->b_ops = &xfs_dquot_buf_ops;
 920                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 921                 xfs_buf_delwri_queue(bp, buffer_list);
 922                 xfs_buf_relse(bp);
 923
 924                 /* goto the next block. */
 925                 bno++;
 926                 firstid += mp->m_quotainfo->qi_dqperchunk;
 927         }
 928
 929         return error;
 930 }
 931
 932 /*
 933  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 934  * caller supplied function for every chunk of dquots that we find.
 935  */
 936 STATIC int
 937 xfs_qm_dqiterate(
 938         struct xfs_mount        *mp,
 939         struct xfs_inode        *qip,
 940         uint                    flags,
 941         struct list_head        *buffer_list)
 942 {
 943         struct xfs_bmbt_irec    *map;
 944         int                     i, nmaps;       /* number of map entries */
 945         int                     error;          /* return value */
 946         xfs_fileoff_t           lblkno;
 947         xfs_filblks_t           maxlblkcnt;
 948         xfs_dqid_t              firstid;
 949         xfs_fsblock_t           rablkno;
 950         xfs_filblks_t           rablkcnt;
 951
 952         error = 0;
 953         /*
 954          * This looks racy, but we can't keep an inode lock across a
 955          * trans_reserve. But, this gets called during quotacheck, and that
 956          * happens only at mount time which is single threaded.
 957          */
 958         if (qip->i_d.di_nblocks == 0)
 959                 return 0;
 960
 961         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 962
 963         lblkno = 0;
 964         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 965         do {
 966                 uint            lock_mode;
 967
 968                 nmaps = XFS_DQITER_MAP_SIZE;
 969                 /*
 970                  * We aren't changing the inode itself. Just changing
 971                  * some of its data. No new blocks are added here, and
 972                  * the inode is never added to the transaction.
 973                  */
 974                 lock_mode = xfs_ilock_data_map_shared(qip);
 975                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 976                                        map, &nmaps, 0);
 977                 xfs_iunlock(qip, lock_mode);
 978                 if (error)
 979                         break;
 980
 981                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 982                 for (i = 0; i < nmaps; i++) {
 983                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 984                         ASSERT(map[i].br_blockcount);
 985
 986
 987                         lblkno += map[i].br_blockcount;
 988
 989                         if (map[i].br_startblock == HOLESTARTBLOCK)
 990                                 continue;
 991
 992                         firstid = (xfs_dqid_t) map[i].br_startoff *
 993                                 mp->m_quotainfo->qi_dqperchunk;
 994                         /*
 995                          * Do a read-ahead on the next extent.
 996                          */
 997                         if ((i+1 < nmaps) &&
 998                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 999                                 rablkcnt =  map[i+1].br_blockcount;
1000                                 rablkno = map[i+1].br_startblock;
1001                                 while (rablkcnt--) {
1002                                         xfs_buf_readahead(mp->m_ddev_targp,
1003                                                XFS_FSB_TO_DADDR(mp, rablkno),
1004                                                mp->m_quotainfo->qi_dqchunklen,
1005                                                &xfs_dquot_buf_ops);
1006                                         rablkno++;
1007                                 }
1008                         }
1009                         /*
1010                          * Iterate thru all the blks in the extent and
1011                          * reset the counters of all the dquots inside them.
1012                          */
1013                         error = xfs_qm_dqiter_bufs(mp, firstid,
1014                                                    map[i].br_startblock,
1015                                                    map[i].br_blockcount,
1016                                                    flags, buffer_list);
1017                         if (error)
1018                                 goto out;
1019                 }
1020         } while (nmaps > 0);
1021
1022 out:
1023         kmem_free(map);
1024         return error;
1025 }
1026
1027 /*
1028  * Called by dqusage_adjust in doing a quotacheck.
1029  *
1030  * Given the inode, and a dquot id this updates both the incore dqout as well
1031  * as the buffer copy. This is so that once the quotacheck is done, we can
1032  * just log all the buffers, as opposed to logging numerous updates to
1033  * individual dquots.
1034  */
1035 STATIC int
1036 xfs_qm_quotacheck_dqadjust(
1037         struct xfs_inode        *ip,
1038         xfs_dqid_t              id,
1039         uint                    type,
1040         xfs_qcnt_t              nblks,
1041         xfs_qcnt_t              rtblks)
1042 {
1043         struct xfs_mount        *mp = ip->i_mount;
1044         struct xfs_dquot        *dqp;
1045         int                     error;
1046
1047         error = xfs_qm_dqget(mp, ip, id, type,
1048                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1049         if (error) {
1050                 /*
1051                  * Shouldn't be able to turn off quotas here.
1052                  */
1053                 ASSERT(error != -ESRCH);
1054                 ASSERT(error != -ENOENT);
1055                 return error;
1056         }
1057
1058         trace_xfs_dqadjust(dqp);
1059
1060         /*
1061          * Adjust the inode count and the block count to reflect this inode's
1062          * resource usage.
1063          */
1064         be64_add_cpu(&dqp->q_core.d_icount, 1);
1065         dqp->q_res_icount++;
1066         if (nblks) {
1067                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1068                 dqp->q_res_bcount += nblks;
1069         }
1070         if (rtblks) {
1071                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1072                 dqp->q_res_rtbcount += rtblks;
1073         }
1074
1075         /*
1076          * Set default limits, adjust timers (since we changed usages)
1077          *
1078          * There are no timers for the default values set in the root dquot.
1079          */
1080         if (dqp->q_core.d_id) {
1081                 xfs_qm_adjust_dqlimits(mp, dqp);
1082                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1083         }
1084
1085         dqp->dq_flags |= XFS_DQ_DIRTY;
1086         xfs_qm_dqput(dqp);
1087         return 0;
1088 }
1089
1090 STATIC int
1091 xfs_qm_get_rtblks(
1092         xfs_inode_t     *ip,
1093         xfs_qcnt_t      *O_rtblks)
1094 {
1095         xfs_filblks_t   rtblks;                 /* total rt blks */
1096         xfs_extnum_t    idx;                    /* extent record index */
1097         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1098         xfs_extnum_t    nextents;               /* number of extent entries */
1099         int             error;
1100
1101         ASSERT(XFS_IS_REALTIME_INODE(ip));
1102         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1103         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1104                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1105                         return error;
1106         }
1107         rtblks = 0;
1108         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1109         for (idx = 0; idx < nextents; idx++)
1110                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1111         *O_rtblks = (xfs_qcnt_t)rtblks;
1112         return 0;
1113 }
1114
1115 /*
1116  * callback routine supplied to bulkstat(). Given an inumber, find its
1117  * dquots and update them to account for resources taken by that inode.
1118  */
1119 /* ARGSUSED */
1120 STATIC int
1121 xfs_qm_dqusage_adjust(
1122         xfs_mount_t     *mp,            /* mount point for filesystem */
1123         xfs_ino_t       ino,            /* inode number to get data for */
1124         void            __user *buffer, /* not used */
1125         int             ubsize,         /* not used */
1126         int             *ubused,        /* not used */
1127         int             *res)           /* result code value */
1128 {
1129         xfs_inode_t     *ip;
1130         xfs_qcnt_t      nblks, rtblks = 0;
1131         int             error;
1132
1133         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1134
1135         /*
1136          * rootino must have its resources accounted for, not so with the quota
1137          * inodes.
1138          */
1139         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1140                 *res = BULKSTAT_RV_NOTHING;
1141                 return -EINVAL;
1142         }
1143
1144         /*
1145          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1146          * interface expects the inode to be exclusively locked because that's
1147          * the case in all other instances. It's OK that we do this because
1148          * quotacheck is done only at mount time.
1149          */
1150         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1151         if (error) {
1152                 *res = BULKSTAT_RV_NOTHING;
1153                 return error;
1154         }
1155
1156         ASSERT(ip->i_delayed_blks == 0);
1157
1158         if (XFS_IS_REALTIME_INODE(ip)) {
1159                 /*
1160                  * Walk thru the extent list and count the realtime blocks.
1161                  */
1162                 error = xfs_qm_get_rtblks(ip, &rtblks);
1163                 if (error)
1164                         goto error0;
1165         }
1166
1167         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1168
1169         /*
1170          * Add the (disk blocks and inode) resources occupied by this
1171          * inode to its dquots. We do this adjustment in the incore dquot,
1172          * and also copy the changes to its buffer.
1173          * We don't care about putting these changes in a transaction
1174          * envelope because if we crash in the middle of a 'quotacheck'
1175          * we have to start from the beginning anyway.
1176          * Once we're done, we'll log all the dquot bufs.
1177          *
1178          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1179          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1180          */
1181         if (XFS_IS_UQUOTA_ON(mp)) {
1182                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1183                                                    XFS_DQ_USER, nblks, rtblks);
1184                 if (error)
1185                         goto error0;
1186         }
1187
1188         if (XFS_IS_GQUOTA_ON(mp)) {
1189                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1190                                                    XFS_DQ_GROUP, nblks, rtblks);
1191                 if (error)
1192                         goto error0;
1193         }
1194
1195         if (XFS_IS_PQUOTA_ON(mp)) {
1196                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1197                                                    XFS_DQ_PROJ, nblks, rtblks);
1198                 if (error)
1199                         goto error0;
1200         }
1201
1202         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1203         IRELE(ip);
1204         *res = BULKSTAT_RV_DIDONE;
1205         return 0;
1206
1207 error0:
1208         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1209         IRELE(ip);
1210         *res = BULKSTAT_RV_GIVEUP;
1211         return error;
1212 }
1213
1214 STATIC int
1215 xfs_qm_flush_one(
1216         struct xfs_dquot        *dqp,
1217         void                    *data)
1218 {
1219         struct list_head        *buffer_list = data;
1220         struct xfs_buf          *bp = NULL;
1221         int                     error = 0;
1222
1223         xfs_dqlock(dqp);
1224         if (dqp->dq_flags & XFS_DQ_FREEING)
1225                 goto out_unlock;
1226         if (!XFS_DQ_IS_DIRTY(dqp))
1227                 goto out_unlock;
1228
1229         xfs_dqflock(dqp);
1230         error = xfs_qm_dqflush(dqp, &bp);
1231         if (error)
1232                 goto out_unlock;
1233
1234         xfs_buf_delwri_queue(bp, buffer_list);
1235         xfs_buf_relse(bp);
1236 out_unlock:
1237         xfs_dqunlock(dqp);
1238         return error;
1239 }
1240
1241 /*
1242  * Walk thru all the filesystem inodes and construct a consistent view
1243  * of the disk quota world. If the quotacheck fails, disable quotas.
1244  */
1245 STATIC int
1246 xfs_qm_quotacheck(
1247         xfs_mount_t     *mp)
1248 {
1249         int                     done, count, error, error2;
1250         xfs_ino_t               lastino;
1251         size_t                  structsz;
1252         uint                    flags;
1253         LIST_HEAD               (buffer_list);
1254         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1255         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1256         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1257
1258         count = INT_MAX;
1259         structsz = 1;
1260         lastino = 0;
1261         flags = 0;
1262
1263         ASSERT(uip || gip || pip);
1264         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1265
1266         xfs_notice(mp, "Quotacheck needed: Please wait.");
1267
1268         /*
1269          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1270          * their counters to zero. We need a clean slate.
1271          * We don't log our changes till later.
1272          */
1273         if (uip) {
1274                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1275                                          &buffer_list);
1276                 if (error)
1277                         goto error_return;
1278                 flags |= XFS_UQUOTA_CHKD;
1279         }
1280
1281         if (gip) {
1282                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1283                                          &buffer_list);
1284                 if (error)
1285                         goto error_return;
1286                 flags |= XFS_GQUOTA_CHKD;
1287         }
1288
1289         if (pip) {
1290                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1291                                          &buffer_list);
1292                 if (error)
1293                         goto error_return;
1294                 flags |= XFS_PQUOTA_CHKD;
1295         }
1296
1297         do {
1298                 /*
1299                  * Iterate thru all the inodes in the file system,
1300                  * adjusting the corresponding dquot counters in core.
1301                  */
1302                 error = xfs_bulkstat(mp, &lastino, &count,
1303                                      xfs_qm_dqusage_adjust,
1304                                      structsz, NULL, &done);
1305                 if (error)
1306                         break;
1307
1308         } while (!done);
1309
1310         /*
1311          * We've made all the changes that we need to make incore.  Flush them
1312          * down to disk buffers if everything was updated successfully.
1313          */
1314         if (XFS_IS_UQUOTA_ON(mp)) {
1315                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1316                                           &buffer_list);
1317         }
1318         if (XFS_IS_GQUOTA_ON(mp)) {
1319                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1320                                            &buffer_list);
1321                 if (!error)
1322                         error = error2;
1323         }
1324         if (XFS_IS_PQUOTA_ON(mp)) {
1325                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1326                                            &buffer_list);
1327                 if (!error)
1328                         error = error2;
1329         }
1330
1331         error2 = xfs_buf_delwri_submit(&buffer_list);
1332         if (!error)
1333                 error = error2;
1334
1335         /*
1336          * We can get this error if we couldn't do a dquot allocation inside
1337          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1338          * dirty dquots that might be cached, we just want to get rid of them
1339          * and turn quotaoff. The dquots won't be attached to any of the inodes
1340          * at this point (because we intentionally didn't in dqget_noattach).
1341          */
1342         if (error) {
1343                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1344                 goto error_return;
1345         }
1346
1347         /*
1348          * If one type of quotas is off, then it will lose its
1349          * quotachecked status, since we won't be doing accounting for
1350          * that type anymore.
1351          */
1352         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1353         mp->m_qflags |= flags;
1354
1355  error_return:
1356         while (!list_empty(&buffer_list)) {
1357                 struct xfs_buf *bp =
1358                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1359                 list_del_init(&bp->b_list);
1360                 xfs_buf_relse(bp);
1361         }
1362
1363         if (error) {
1364                 xfs_warn(mp,
1365         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1366                         error);
1367                 /*
1368                  * We must turn off quotas.
1369                  */
1370                 ASSERT(mp->m_quotainfo != NULL);
1371                 xfs_qm_destroy_quotainfo(mp);
1372                 if (xfs_mount_reset_sbqflags(mp)) {
1373                         xfs_warn(mp,
1374                                 "Quotacheck: Failed to reset quota flags.");
1375                 }
1376         } else
1377                 xfs_notice(mp, "Quotacheck: Done.");
1378         return error;
1379 }
1380
1381 /*
1382  * This is called from xfs_mountfs to start quotas and initialize all
1383  * necessary data structures like quotainfo.  This is also responsible for
1384  * running a quotacheck as necessary.  We are guaranteed that the superblock
1385  * is consistently read in at this point.
1386  *
1387  * If we fail here, the mount will continue with quota turned off. We don't
1388  * need to inidicate success or failure at all.
1389  */
1390 void
1391 xfs_qm_mount_quotas(
1392         struct xfs_mount        *mp)
1393 {
1394         int                     error = 0;
1395         uint                    sbf;
1396
1397         /*
1398          * If quotas on realtime volumes is not supported, we disable
1399          * quotas immediately.
1400          */
1401         if (mp->m_sb.sb_rextents) {
1402                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1403                 mp->m_qflags = 0;
1404                 goto write_changes;
1405         }
1406
1407         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1408
1409         /*
1410          * Allocate the quotainfo structure inside the mount struct, and
1411          * create quotainode(s), and change/rev superblock if necessary.
1412          */
1413         error = xfs_qm_init_quotainfo(mp);
1414         if (error) {
1415                 /*
1416                  * We must turn off quotas.
1417                  */
1418                 ASSERT(mp->m_quotainfo == NULL);
1419                 mp->m_qflags = 0;
1420                 goto write_changes;
1421         }
1422         /*
1423          * If any of the quotas are not consistent, do a quotacheck.
1424          */
1425         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1426                 error = xfs_qm_quotacheck(mp);
1427                 if (error) {
1428                         /* Quotacheck failed and disabled quotas. */
1429                         return;
1430                 }
1431         }
1432         /*
1433          * If one type of quotas is off, then it will lose its
1434          * quotachecked status, since we won't be doing accounting for
1435          * that type anymore.
1436          */
1437         if (!XFS_IS_UQUOTA_ON(mp))
1438                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1439         if (!XFS_IS_GQUOTA_ON(mp))
1440                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1441         if (!XFS_IS_PQUOTA_ON(mp))
1442                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1443
1444  write_changes:
1445         /*
1446          * We actually don't have to acquire the m_sb_lock at all.
1447          * This can only be called from mount, and that's single threaded. XXX
1448          */
1449         spin_lock(&mp->m_sb_lock);
1450         sbf = mp->m_sb.sb_qflags;
1451         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1452         spin_unlock(&mp->m_sb_lock);
1453
1454         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1455                 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
1456                         /*
1457                          * We could only have been turning quotas off.
1458                          * We aren't in very good shape actually because
1459                          * the incore structures are convinced that quotas are
1460                          * off, but the on disk superblock doesn't know that !
1461                          */
1462                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1463                         xfs_alert(mp, "%s: Superblock update failed!",
1464                                 __func__);
1465                 }
1466         }
1467
1468         if (error) {
1469                 xfs_warn(mp, "Failed to initialize disk quotas.");
1470                 return;
1471         }
1472 }
1473
1474 /*
1475  * This is called after the superblock has been read in and we're ready to
1476  * iget the quota inodes.
1477  */
1478 STATIC int
1479 xfs_qm_init_quotainos(
1480         xfs_mount_t     *mp)
1481 {
1482         struct xfs_inode        *uip = NULL;
1483         struct xfs_inode        *gip = NULL;
1484         struct xfs_inode        *pip = NULL;
1485         int                     error;
1486         __int64_t               sbflags = 0;
1487         uint                    flags = 0;
1488
1489         ASSERT(mp->m_quotainfo);
1490
1491         /*
1492          * Get the uquota and gquota inodes
1493          */
1494         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1495                 if (XFS_IS_UQUOTA_ON(mp) &&
1496                     mp->m_sb.sb_uquotino != NULLFSINO) {
1497                         ASSERT(mp->m_sb.sb_uquotino > 0);
1498                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1499                                              0, 0, &uip);
1500                         if (error)
1501                                 return error;
1502                 }
1503                 if (XFS_IS_GQUOTA_ON(mp) &&
1504                     mp->m_sb.sb_gquotino != NULLFSINO) {
1505                         ASSERT(mp->m_sb.sb_gquotino > 0);
1506                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1507                                              0, 0, &gip);
1508                         if (error)
1509                                 goto error_rele;
1510                 }
1511                 if (XFS_IS_PQUOTA_ON(mp) &&
1512                     mp->m_sb.sb_pquotino != NULLFSINO) {
1513                         ASSERT(mp->m_sb.sb_pquotino > 0);
1514                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1515                                              0, 0, &pip);
1516                         if (error)
1517                                 goto error_rele;
1518                 }
1519         } else {
1520                 flags |= XFS_QMOPT_SBVERSION;
1521                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1522                             XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
1523                             XFS_SB_QFLAGS);
1524         }
1525
1526         /*
1527          * Create the three inodes, if they don't exist already. The changes
1528          * made above will get added to a transaction and logged in one of
1529          * the qino_alloc calls below.  If the device is readonly,
1530          * temporarily switch to read-write to do this.
1531          */
1532         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1533                 error = xfs_qm_qino_alloc(mp, &uip,
1534                                               sbflags | XFS_SB_UQUOTINO,
1535                                               flags | XFS_QMOPT_UQUOTA);
1536                 if (error)
1537                         goto error_rele;
1538
1539                 flags &= ~XFS_QMOPT_SBVERSION;
1540         }
1541         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1542                 error = xfs_qm_qino_alloc(mp, &gip,
1543                                           sbflags | XFS_SB_GQUOTINO,
1544                                           flags | XFS_QMOPT_GQUOTA);
1545                 if (error)
1546                         goto error_rele;
1547
1548                 flags &= ~XFS_QMOPT_SBVERSION;
1549         }
1550         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1551                 error = xfs_qm_qino_alloc(mp, &pip,
1552                                           sbflags | XFS_SB_PQUOTINO,
1553                                           flags | XFS_QMOPT_PQUOTA);
1554                 if (error)
1555                         goto error_rele;
1556         }
1557
1558         mp->m_quotainfo->qi_uquotaip = uip;
1559         mp->m_quotainfo->qi_gquotaip = gip;
1560         mp->m_quotainfo->qi_pquotaip = pip;
1561
1562         return 0;
1563
1564 error_rele:
1565         if (uip)
1566                 IRELE(uip);
1567         if (gip)
1568                 IRELE(gip);
1569         if (pip)
1570                 IRELE(pip);
1571         return error;
1572 }
1573
1574 STATIC void
1575 xfs_qm_dqfree_one(
1576         struct xfs_dquot        *dqp)
1577 {
1578         struct xfs_mount        *mp = dqp->q_mount;
1579         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1580
1581         mutex_lock(&qi->qi_tree_lock);
1582         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1583                           be32_to_cpu(dqp->q_core.d_id));
1584
1585         qi->qi_dquots--;
1586         mutex_unlock(&qi->qi_tree_lock);
1587
1588         xfs_qm_dqdestroy(dqp);
1589 }
1590
1591 /*
1592  * Start a transaction and write the incore superblock changes to
1593  * disk. flags parameter indicates which fields have changed.
1594  */
1595 int
1596 xfs_qm_write_sb_changes(
1597         xfs_mount_t     *mp,
1598         __int64_t       flags)
1599 {
1600         xfs_trans_t     *tp;
1601         int             error;
1602
1603         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1604         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_sbchange, 0, 0);
1605         if (error) {
1606                 xfs_trans_cancel(tp, 0);
1607                 return error;
1608         }
1609
1610         xfs_mod_sb(tp, flags);
1611         error = xfs_trans_commit(tp, 0);
1612
1613         return error;
1614 }
1615
1616
1617 /* --------------- utility functions for vnodeops ---------------- */
1618
1619
1620 /*
1621  * Given an inode, a uid, gid and prid make sure that we have
1622  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1623  * quotas by creating this file.
1624  * This also attaches dquot(s) to the given inode after locking it,
1625  * and returns the dquots corresponding to the uid and/or gid.
1626  *
1627  * in   : inode (unlocked)
1628  * out  : udquot, gdquot with references taken and unlocked
1629  */
1630 int
1631 xfs_qm_vop_dqalloc(
1632         struct xfs_inode        *ip,
1633         xfs_dqid_t              uid,
1634         xfs_dqid_t              gid,
1635         prid_t                  prid,
1636         uint                    flags,
1637         struct xfs_dquot        **O_udqpp,
1638         struct xfs_dquot        **O_gdqpp,
1639         struct xfs_dquot        **O_pdqpp)
1640 {
1641         struct xfs_mount        *mp = ip->i_mount;
1642         struct xfs_dquot        *uq = NULL;
1643         struct xfs_dquot        *gq = NULL;
1644         struct xfs_dquot        *pq = NULL;
1645         int                     error;
1646         uint                    lockflags;
1647
1648         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1649                 return 0;
1650
1651         lockflags = XFS_ILOCK_EXCL;
1652         xfs_ilock(ip, lockflags);
1653
1654         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1655                 gid = ip->i_d.di_gid;
1656
1657         /*
1658          * Attach the dquot(s) to this inode, doing a dquot allocation
1659          * if necessary. The dquot(s) will not be locked.
1660          */
1661         if (XFS_NOT_DQATTACHED(mp, ip)) {
1662                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1663                 if (error) {
1664                         xfs_iunlock(ip, lockflags);
1665                         return error;
1666                 }
1667         }
1668
1669         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1670                 if (ip->i_d.di_uid != uid) {
1671                         /*
1672                          * What we need is the dquot that has this uid, and
1673                          * if we send the inode to dqget, the uid of the inode
1674                          * takes priority over what's sent in the uid argument.
1675                          * We must unlock inode here before calling dqget if
1676                          * we're not sending the inode, because otherwise
1677                          * we'll deadlock by doing trans_reserve while
1678                          * holding ilock.
1679                          */
1680                         xfs_iunlock(ip, lockflags);
1681                         error = xfs_qm_dqget(mp, NULL, uid,
1682                                                  XFS_DQ_USER,
1683                                                  XFS_QMOPT_DQALLOC |
1684                                                  XFS_QMOPT_DOWARN,
1685                                                  &uq);
1686                         if (error) {
1687                                 ASSERT(error != -ENOENT);
1688                                 return error;
1689                         }
1690                         /*
1691                          * Get the ilock in the right order.
1692                          */
1693                         xfs_dqunlock(uq);
1694                         lockflags = XFS_ILOCK_SHARED;
1695                         xfs_ilock(ip, lockflags);
1696                 } else {
1697                         /*
1698                          * Take an extra reference, because we'll return
1699                          * this to caller
1700                          */
1701                         ASSERT(ip->i_udquot);
1702                         uq = xfs_qm_dqhold(ip->i_udquot);
1703                 }
1704         }
1705         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1706                 if (ip->i_d.di_gid != gid) {
1707                         xfs_iunlock(ip, lockflags);
1708                         error = xfs_qm_dqget(mp, NULL, gid,
1709                                                  XFS_DQ_GROUP,
1710                                                  XFS_QMOPT_DQALLOC |
1711                                                  XFS_QMOPT_DOWARN,
1712                                                  &gq);
1713                         if (error) {
1714                                 ASSERT(error != -ENOENT);
1715                                 goto error_rele;
1716                         }
1717                         xfs_dqunlock(gq);
1718                         lockflags = XFS_ILOCK_SHARED;
1719                         xfs_ilock(ip, lockflags);
1720                 } else {
1721                         ASSERT(ip->i_gdquot);
1722                         gq = xfs_qm_dqhold(ip->i_gdquot);
1723                 }
1724         }
1725         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1726                 if (xfs_get_projid(ip) != prid) {
1727                         xfs_iunlock(ip, lockflags);
1728                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1729                                                  XFS_DQ_PROJ,
1730                                                  XFS_QMOPT_DQALLOC |
1731                                                  XFS_QMOPT_DOWARN,
1732                                                  &pq);
1733                         if (error) {
1734                                 ASSERT(error != -ENOENT);
1735                                 goto error_rele;
1736                         }
1737                         xfs_dqunlock(pq);
1738                         lockflags = XFS_ILOCK_SHARED;
1739                         xfs_ilock(ip, lockflags);
1740                 } else {
1741                         ASSERT(ip->i_pdquot);
1742                         pq = xfs_qm_dqhold(ip->i_pdquot);
1743                 }
1744         }
1745         if (uq)
1746                 trace_xfs_dquot_dqalloc(ip);
1747
1748         xfs_iunlock(ip, lockflags);
1749         if (O_udqpp)
1750                 *O_udqpp = uq;
1751         else if (uq)
1752                 xfs_qm_dqrele(uq);
1753         if (O_gdqpp)
1754                 *O_gdqpp = gq;
1755         else if (gq)
1756                 xfs_qm_dqrele(gq);
1757         if (O_pdqpp)
1758                 *O_pdqpp = pq;
1759         else if (pq)
1760                 xfs_qm_dqrele(pq);
1761         return 0;
1762
1763 error_rele:
1764         if (gq)
1765                 xfs_qm_dqrele(gq);
1766         if (uq)
1767                 xfs_qm_dqrele(uq);
1768         return error;
1769 }
1770
1771 /*
1772  * Actually transfer ownership, and do dquot modifications.
1773  * These were already reserved.
1774  */
1775 xfs_dquot_t *
1776 xfs_qm_vop_chown(
1777         xfs_trans_t     *tp,
1778         xfs_inode_t     *ip,
1779         xfs_dquot_t     **IO_olddq,
1780         xfs_dquot_t     *newdq)
1781 {
1782         xfs_dquot_t     *prevdq;
1783         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1784                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1785
1786
1787         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1788         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1789
1790         /* old dquot */
1791         prevdq = *IO_olddq;
1792         ASSERT(prevdq);
1793         ASSERT(prevdq != newdq);
1794
1795         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1796         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1797
1798         /* the sparkling new dquot */
1799         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1800         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1801
1802         /*
1803          * Take an extra reference, because the inode is going to keep
1804          * this dquot pointer even after the trans_commit.
1805          */
1806         *IO_olddq = xfs_qm_dqhold(newdq);
1807
1808         return prevdq;
1809 }
1810
1811 /*
1812  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1813  */
1814 int
1815 xfs_qm_vop_chown_reserve(
1816         struct xfs_trans        *tp,
1817         struct xfs_inode        *ip,
1818         struct xfs_dquot        *udqp,
1819         struct xfs_dquot        *gdqp,
1820         struct xfs_dquot        *pdqp,
1821         uint                    flags)
1822 {
1823         struct xfs_mount        *mp = ip->i_mount;
1824         uint                    delblks, blkflags, prjflags = 0;
1825         struct xfs_dquot        *udq_unres = NULL;
1826         struct xfs_dquot        *gdq_unres = NULL;
1827         struct xfs_dquot        *pdq_unres = NULL;
1828         struct xfs_dquot        *udq_delblks = NULL;
1829         struct xfs_dquot        *gdq_delblks = NULL;
1830         struct xfs_dquot        *pdq_delblks = NULL;
1831         int                     error;
1832
1833
1834         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1835         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1836
1837         delblks = ip->i_delayed_blks;
1838         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1839                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1840
1841         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1842             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1843                 udq_delblks = udqp;
1844                 /*
1845                  * If there are delayed allocation blocks, then we have to
1846                  * unreserve those from the old dquot, and add them to the
1847                  * new dquot.
1848                  */
1849                 if (delblks) {
1850                         ASSERT(ip->i_udquot);
1851                         udq_unres = ip->i_udquot;
1852                 }
1853         }
1854         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1855             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1856                 gdq_delblks = gdqp;
1857                 if (delblks) {
1858                         ASSERT(ip->i_gdquot);
1859                         gdq_unres = ip->i_gdquot;
1860                 }
1861         }
1862
1863         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1864             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1865                 prjflags = XFS_QMOPT_ENOSPC;
1866                 pdq_delblks = pdqp;
1867                 if (delblks) {
1868                         ASSERT(ip->i_pdquot);
1869                         pdq_unres = ip->i_pdquot;
1870                 }
1871         }
1872
1873         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1874                                 udq_delblks, gdq_delblks, pdq_delblks,
1875                                 ip->i_d.di_nblocks, 1,
1876                                 flags | blkflags | prjflags);
1877         if (error)
1878                 return error;
1879
1880         /*
1881          * Do the delayed blks reservations/unreservations now. Since, these
1882          * are done without the help of a transaction, if a reservation fails
1883          * its previous reservations won't be automatically undone by trans
1884          * code. So, we have to do it manually here.
1885          */
1886         if (delblks) {
1887                 /*
1888                  * Do the reservations first. Unreservation can't fail.
1889                  */
1890                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1891                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1892                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1893                             udq_delblks, gdq_delblks, pdq_delblks,
1894                             (xfs_qcnt_t)delblks, 0,
1895                             flags | blkflags | prjflags);
1896                 if (error)
1897                         return error;
1898                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1899                                 udq_unres, gdq_unres, pdq_unres,
1900                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1901         }
1902
1903         return 0;
1904 }
1905
1906 int
1907 xfs_qm_vop_rename_dqattach(
1908         struct xfs_inode        **i_tab)
1909 {
1910         struct xfs_mount        *mp = i_tab[0]->i_mount;
1911         int                     i;
1912
1913         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1914                 return 0;
1915
1916         for (i = 0; (i < 4 && i_tab[i]); i++) {
1917                 struct xfs_inode        *ip = i_tab[i];
1918                 int                     error;
1919
1920                 /*
1921                  * Watch out for duplicate entries in the table.
1922                  */
1923                 if (i == 0 || ip != i_tab[i-1]) {
1924                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1925                                 error = xfs_qm_dqattach(ip, 0);
1926                                 if (error)
1927                                         return error;
1928                         }
1929                 }
1930         }
1931         return 0;
1932 }
1933
1934 void
1935 xfs_qm_vop_create_dqattach(
1936         struct xfs_trans        *tp,
1937         struct xfs_inode        *ip,
1938         struct xfs_dquot        *udqp,
1939         struct xfs_dquot        *gdqp,
1940         struct xfs_dquot        *pdqp)
1941 {
1942         struct xfs_mount        *mp = tp->t_mountp;
1943
1944         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1945                 return;
1946
1947         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1948         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1949
1950         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1951                 ASSERT(ip->i_udquot == NULL);
1952                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1953
1954                 ip->i_udquot = xfs_qm_dqhold(udqp);
1955                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1956         }
1957         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1958                 ASSERT(ip->i_gdquot == NULL);
1959                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1960                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1961                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1962         }
1963         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1964                 ASSERT(ip->i_pdquot == NULL);
1965                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1966
1967                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1968                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1969         }
1970 }
1971