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                 __releases(lru_lock) __acquires(lru_lock)
 438 {
 439         struct xfs_dquot        *dqp = container_of(item,
 440                                                 struct xfs_dquot, q_lru);
 441         struct xfs_qm_isolate   *isol = arg;
 442
 443         if (!xfs_dqlock_nowait(dqp))
 444                 goto out_miss_busy;
 445
 446         /*
 447          * This dquot has acquired a reference in the meantime remove it from
 448          * the freelist and try again.
 449          */
 450         if (dqp->q_nrefs) {
 451                 xfs_dqunlock(dqp);
 452                 XFS_STATS_INC(xs_qm_dqwants);
 453
 454                 trace_xfs_dqreclaim_want(dqp);
 455                 list_del_init(&dqp->q_lru);
 456                 XFS_STATS_DEC(xs_qm_dquot_unused);
 457                 return LRU_REMOVED;
 458         }
 459
 460         /*
 461          * If the dquot is dirty, flush it. If it's already being flushed, just
 462          * skip it so there is time for the IO to complete before we try to
 463          * reclaim it again on the next LRU pass.
 464          */
 465         if (!xfs_dqflock_nowait(dqp)) {
 466                 xfs_dqunlock(dqp);
 467                 goto out_miss_busy;
 468         }
 469
 470         if (XFS_DQ_IS_DIRTY(dqp)) {
 471                 struct xfs_buf  *bp = NULL;
 472                 int             error;
 473
 474                 trace_xfs_dqreclaim_dirty(dqp);
 475
 476                 /* we have to drop the LRU lock to flush the dquot */
 477                 spin_unlock(lru_lock);
 478
 479                 error = xfs_qm_dqflush(dqp, &bp);
 480                 if (error) {
 481                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 482                                  __func__, dqp);
 483                         goto out_unlock_dirty;
 484                 }
 485
 486                 xfs_buf_delwri_queue(bp, &isol->buffers);
 487                 xfs_buf_relse(bp);
 488                 goto out_unlock_dirty;
 489         }
 490         xfs_dqfunlock(dqp);
 491
 492         /*
 493          * Prevent lookups now that we are past the point of no return.
 494          */
 495         dqp->dq_flags |= XFS_DQ_FREEING;
 496         xfs_dqunlock(dqp);
 497
 498         ASSERT(dqp->q_nrefs == 0);
 499         list_move_tail(&dqp->q_lru, &isol->dispose);
 500         XFS_STATS_DEC(xs_qm_dquot_unused);
 501         trace_xfs_dqreclaim_done(dqp);
 502         XFS_STATS_INC(xs_qm_dqreclaims);
 503         return LRU_REMOVED;
 504
 505 out_miss_busy:
 506         trace_xfs_dqreclaim_busy(dqp);
 507         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 508         return LRU_SKIP;
 509
 510 out_unlock_dirty:
 511         trace_xfs_dqreclaim_busy(dqp);
 512         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 513         xfs_dqunlock(dqp);
 514         spin_lock(lru_lock);
 515         return LRU_RETRY;
 516 }
 517
 518 static unsigned long
 519 xfs_qm_shrink_scan(
 520         struct shrinker         *shrink,
 521         struct shrink_control   *sc)
 522 {
 523         struct xfs_quotainfo    *qi = container_of(shrink,
 524                                         struct xfs_quotainfo, qi_shrinker);
 525         struct xfs_qm_isolate   isol;
 526         unsigned long           freed;
 527         int                     error;
 528         unsigned long           nr_to_scan = sc->nr_to_scan;
 529
 530         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
 531                 return 0;
 532
 533         INIT_LIST_HEAD(&isol.buffers);
 534         INIT_LIST_HEAD(&isol.dispose);
 535
 536         freed = list_lru_walk_node(&qi->qi_lru, sc->nid, xfs_qm_dquot_isolate, &isol,
 537                                         &nr_to_scan);
 538
 539         error = xfs_buf_delwri_submit(&isol.buffers);
 540         if (error)
 541                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 542
 543         while (!list_empty(&isol.dispose)) {
 544                 struct xfs_dquot        *dqp;
 545
 546                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 547                 list_del_init(&dqp->q_lru);
 548                 xfs_qm_dqfree_one(dqp);
 549         }
 550
 551         return freed;
 552 }
 553
 554 static unsigned long
 555 xfs_qm_shrink_count(
 556         struct shrinker         *shrink,
 557         struct shrink_control   *sc)
 558 {
 559         struct xfs_quotainfo    *qi = container_of(shrink,
 560                                         struct xfs_quotainfo, qi_shrinker);
 561
 562         return list_lru_count_node(&qi->qi_lru, sc->nid);
 563 }
 564
 565 /*
 566  * This initializes all the quota information that's kept in the
 567  * mount structure
 568  */
 569 STATIC int
 570 xfs_qm_init_quotainfo(
 571         xfs_mount_t     *mp)
 572 {
 573         xfs_quotainfo_t *qinf;
 574         int             error;
 575         xfs_dquot_t     *dqp;
 576
 577         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 578
 579         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 580
 581         error = list_lru_init(&qinf->qi_lru);
 582         if (error)
 583                 goto out_free_qinf;
 584
 585         /*
 586          * See if quotainodes are setup, and if not, allocate them,
 587          * and change the superblock accordingly.
 588          */
 589         error = xfs_qm_init_quotainos(mp);
 590         if (error)
 591                 goto out_free_lru;
 592
 593         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 594         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 595         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 596         mutex_init(&qinf->qi_tree_lock);
 597
 598         /* mutex used to serialize quotaoffs */
 599         mutex_init(&qinf->qi_quotaofflock);
 600
 601         /* Precalc some constants */
 602         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 603         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 604
 605         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 606
 607         /*
 608          * We try to get the limits from the superuser's limits fields.
 609          * This is quite hacky, but it is standard quota practice.
 610          *
 611          * We look at the USR dquot with id == 0 first, but if user quotas
 612          * are not enabled we goto the GRP dquot with id == 0.
 613          * We don't really care to keep separate default limits for user
 614          * and group quotas, at least not at this point.
 615          *
 616          * Since we may not have done a quotacheck by this point, just read
 617          * the dquot without attaching it to any hashtables or lists.
 618          */
 619         error = xfs_qm_dqread(mp, 0,
 620                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 621                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 622                           XFS_DQ_PROJ),
 623                         XFS_QMOPT_DOWARN, &dqp);
 624         if (!error) {
 625                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 626
 627                 /*
 628                  * The warnings and timers set the grace period given to
 629                  * a user or group before he or she can not perform any
 630                  * more writing. If it is zero, a default is used.
 631                  */
 632                 qinf->qi_btimelimit = ddqp->d_btimer ?
 633                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 634                 qinf->qi_itimelimit = ddqp->d_itimer ?
 635                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 636                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 637                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 638                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 639                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 640                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 641                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 642                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 643                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 644                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 645                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 646                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 647                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 648                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 649                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 650
 651                 xfs_qm_dqdestroy(dqp);
 652         } else {
 653                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 654                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 655                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 656                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 657                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 658                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 659         }
 660
 661         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 662         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 663         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 664         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 665         register_shrinker(&qinf->qi_shrinker);
 666         return 0;
 667
 668 out_free_lru:
 669         list_lru_destroy(&qinf->qi_lru);
 670 out_free_qinf:
 671         kmem_free(qinf);
 672         mp->m_quotainfo = NULL;
 673         return error;
 674 }
 675
 676
 677 /*
 678  * Gets called when unmounting a filesystem or when all quotas get
 679  * turned off.
 680  * This purges the quota inodes, destroys locks and frees itself.
 681  */
 682 void
 683 xfs_qm_destroy_quotainfo(
 684         xfs_mount_t     *mp)
 685 {
 686         xfs_quotainfo_t *qi;
 687
 688         qi = mp->m_quotainfo;
 689         ASSERT(qi != NULL);
 690
 691         unregister_shrinker(&qi->qi_shrinker);
 692         list_lru_destroy(&qi->qi_lru);
 693
 694         if (qi->qi_uquotaip) {
 695                 IRELE(qi->qi_uquotaip);
 696                 qi->qi_uquotaip = NULL; /* paranoia */
 697         }
 698         if (qi->qi_gquotaip) {
 699                 IRELE(qi->qi_gquotaip);
 700                 qi->qi_gquotaip = NULL;
 701         }
 702         if (qi->qi_pquotaip) {
 703                 IRELE(qi->qi_pquotaip);
 704                 qi->qi_pquotaip = NULL;
 705         }
 706         mutex_destroy(&qi->qi_quotaofflock);
 707         kmem_free(qi);
 708         mp->m_quotainfo = NULL;
 709 }
 710
 711 /*
 712  * Create an inode and return with a reference already taken, but unlocked
 713  * This is how we create quota inodes
 714  */
 715 STATIC int
 716 xfs_qm_qino_alloc(
 717         xfs_mount_t     *mp,
 718         xfs_inode_t     **ip,
 719         __int64_t       sbfields,
 720         uint            flags)
 721 {
 722         xfs_trans_t     *tp;
 723         int             error;
 724         int             committed;
 725
 726         *ip = NULL;
 727         /*
 728          * With superblock that doesn't have separate pquotino, we
 729          * share an inode between gquota and pquota. If the on-disk
 730          * superblock has GQUOTA and the filesystem is now mounted
 731          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 732          * vice-versa.
 733          */
 734         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 735                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 736                 xfs_ino_t ino = NULLFSINO;
 737
 738                 if ((flags & XFS_QMOPT_PQUOTA) &&
 739                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 740                         ino = mp->m_sb.sb_gquotino;
 741                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 742                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 743                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 744                         ino = mp->m_sb.sb_pquotino;
 745                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 746                 }
 747                 if (ino != NULLFSINO) {
 748                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 749                         if (error)
 750                                 return error;
 751                         mp->m_sb.sb_gquotino = NULLFSINO;
 752                         mp->m_sb.sb_pquotino = NULLFSINO;
 753                 }
 754         }
 755
 756         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 757         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 758                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 759         if (error) {
 760                 xfs_trans_cancel(tp, 0);
 761                 return error;
 762         }
 763
 764         if (!*ip) {
 765                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 766                                                                 &committed);
 767                 if (error) {
 768                         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 769                                          XFS_TRANS_ABORT);
 770                         return error;
 771                 }
 772         }
 773
 774         /*
 775          * Make the changes in the superblock, and log those too.
 776          * sbfields arg may contain fields other than *QUOTINO;
 777          * VERSIONNUM for example.
 778          */
 779         spin_lock(&mp->m_sb_lock);
 780         if (flags & XFS_QMOPT_SBVERSION) {
 781                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 782                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 783                         XFS_SB_GQUOTINO | XFS_SB_PQUOTINO | XFS_SB_QFLAGS)) ==
 784                                 (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 785                                  XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
 786                                  XFS_SB_QFLAGS));
 787
 788                 xfs_sb_version_addquota(&mp->m_sb);
 789                 mp->m_sb.sb_uquotino = NULLFSINO;
 790                 mp->m_sb.sb_gquotino = NULLFSINO;
 791                 mp->m_sb.sb_pquotino = NULLFSINO;
 792
 793                 /* qflags will get updated fully _after_ quotacheck */
 794                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 795         }
 796         if (flags & XFS_QMOPT_UQUOTA)
 797                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 798         else if (flags & XFS_QMOPT_GQUOTA)
 799                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 800         else
 801                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 802         spin_unlock(&mp->m_sb_lock);
 803         xfs_mod_sb(tp, sbfields);
 804
 805         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 806                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 807                 return error;
 808         }
 809         return 0;
 810 }
 811
 812
 813 STATIC void
 814 xfs_qm_reset_dqcounts(
 815         xfs_mount_t     *mp,
 816         xfs_buf_t       *bp,
 817         xfs_dqid_t      id,
 818         uint            type)
 819 {
 820         struct xfs_dqblk        *dqb;
 821         int                     j;
 822
 823         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 824
 825         /*
 826          * Reset all counters and timers. They'll be
 827          * started afresh by xfs_qm_quotacheck.
 828          */
 829 #ifdef DEBUG
 830         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 831         do_div(j, sizeof(xfs_dqblk_t));
 832         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 833 #endif
 834         dqb = bp->b_addr;
 835         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 836                 struct xfs_disk_dquot   *ddq;
 837
 838                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 839
 840                 /*
 841                  * Do a sanity check, and if needed, repair the dqblk. Don't
 842                  * output any warnings because it's perfectly possible to
 843                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 844                  */
 845                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 846                             "xfs_quotacheck");
 847                 ddq->d_bcount = 0;
 848                 ddq->d_icount = 0;
 849                 ddq->d_rtbcount = 0;
 850                 ddq->d_btimer = 0;
 851                 ddq->d_itimer = 0;
 852                 ddq->d_rtbtimer = 0;
 853                 ddq->d_bwarns = 0;
 854                 ddq->d_iwarns = 0;
 855                 ddq->d_rtbwarns = 0;
 856
 857                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 858                         xfs_update_cksum((char *)&dqb[j],
 859                                          sizeof(struct xfs_dqblk),
 860                                          XFS_DQUOT_CRC_OFF);
 861                 }
 862         }
 863 }
 864
 865 STATIC int
 866 xfs_qm_dqiter_bufs(
 867         struct xfs_mount        *mp,
 868         xfs_dqid_t              firstid,
 869         xfs_fsblock_t           bno,
 870         xfs_filblks_t           blkcnt,
 871         uint                    flags,
 872         struct list_head        *buffer_list)
 873 {
 874         struct xfs_buf          *bp;
 875         int                     error;
 876         int                     type;
 877
 878         ASSERT(blkcnt > 0);
 879         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 880                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 881         error = 0;
 882
 883         /*
 884          * Blkcnt arg can be a very big number, and might even be
 885          * larger than the log itself. So, we have to break it up into
 886          * manageable-sized transactions.
 887          * Note that we don't start a permanent transaction here; we might
 888          * not be able to get a log reservation for the whole thing up front,
 889          * and we don't really care to either, because we just discard
 890          * everything if we were to crash in the middle of this loop.
 891          */
 892         while (blkcnt--) {
 893                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 894                               XFS_FSB_TO_DADDR(mp, bno),
 895                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 896                               &xfs_dquot_buf_ops);
 897
 898                 /*
 899                  * CRC and validation errors will return a EFSCORRUPTED here. If
 900                  * this occurs, re-read without CRC validation so that we can
 901                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 902                  * will leave a trace in the log indicating corruption has
 903                  * been detected.
 904                  */
 905                 if (error == -EFSCORRUPTED) {
 906                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 907                                       XFS_FSB_TO_DADDR(mp, bno),
 908                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 909                                       NULL);
 910                 }
 911
 912                 if (error)
 913                         break;
 914
 915                 /*
 916                  * A corrupt buffer might not have a verifier attached, so
 917                  * make sure we have the correct one attached before writeback
 918                  * occurs.
 919                  */
 920                 bp->b_ops = &xfs_dquot_buf_ops;
 921                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 922                 xfs_buf_delwri_queue(bp, buffer_list);
 923                 xfs_buf_relse(bp);
 924
 925                 /* goto the next block. */
 926                 bno++;
 927                 firstid += mp->m_quotainfo->qi_dqperchunk;
 928         }
 929
 930         return error;
 931 }
 932
 933 /*
 934  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 935  * caller supplied function for every chunk of dquots that we find.
 936  */
 937 STATIC int
 938 xfs_qm_dqiterate(
 939         struct xfs_mount        *mp,
 940         struct xfs_inode        *qip,
 941         uint                    flags,
 942         struct list_head        *buffer_list)
 943 {
 944         struct xfs_bmbt_irec    *map;
 945         int                     i, nmaps;       /* number of map entries */
 946         int                     error;          /* return value */
 947         xfs_fileoff_t           lblkno;
 948         xfs_filblks_t           maxlblkcnt;
 949         xfs_dqid_t              firstid;
 950         xfs_fsblock_t           rablkno;
 951         xfs_filblks_t           rablkcnt;
 952
 953         error = 0;
 954         /*
 955          * This looks racy, but we can't keep an inode lock across a
 956          * trans_reserve. But, this gets called during quotacheck, and that
 957          * happens only at mount time which is single threaded.
 958          */
 959         if (qip->i_d.di_nblocks == 0)
 960                 return 0;
 961
 962         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 963
 964         lblkno = 0;
 965         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 966         do {
 967                 uint            lock_mode;
 968
 969                 nmaps = XFS_DQITER_MAP_SIZE;
 970                 /*
 971                  * We aren't changing the inode itself. Just changing
 972                  * some of its data. No new blocks are added here, and
 973                  * the inode is never added to the transaction.
 974                  */
 975                 lock_mode = xfs_ilock_data_map_shared(qip);
 976                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 977                                        map, &nmaps, 0);
 978                 xfs_iunlock(qip, lock_mode);
 979                 if (error)
 980                         break;
 981
 982                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 983                 for (i = 0; i < nmaps; i++) {
 984                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 985                         ASSERT(map[i].br_blockcount);
 986
 987
 988                         lblkno += map[i].br_blockcount;
 989
 990                         if (map[i].br_startblock == HOLESTARTBLOCK)
 991                                 continue;
 992
 993                         firstid = (xfs_dqid_t) map[i].br_startoff *
 994                                 mp->m_quotainfo->qi_dqperchunk;
 995                         /*
 996                          * Do a read-ahead on the next extent.
 997                          */
 998                         if ((i+1 < nmaps) &&
 999                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1000                                 rablkcnt =  map[i+1].br_blockcount;
1001                                 rablkno = map[i+1].br_startblock;
1002                                 while (rablkcnt--) {
1003                                         xfs_buf_readahead(mp->m_ddev_targp,
1004                                                XFS_FSB_TO_DADDR(mp, rablkno),
1005                                                mp->m_quotainfo->qi_dqchunklen,
1006                                                &xfs_dquot_buf_ops);
1007                                         rablkno++;
1008                                 }
1009                         }
1010                         /*
1011                          * Iterate thru all the blks in the extent and
1012                          * reset the counters of all the dquots inside them.
1013                          */
1014                         error = xfs_qm_dqiter_bufs(mp, firstid,
1015                                                    map[i].br_startblock,
1016                                                    map[i].br_blockcount,
1017                                                    flags, buffer_list);
1018                         if (error)
1019                                 goto out;
1020                 }
1021         } while (nmaps > 0);
1022
1023 out:
1024         kmem_free(map);
1025         return error;
1026 }
1027
1028 /*
1029  * Called by dqusage_adjust in doing a quotacheck.
1030  *
1031  * Given the inode, and a dquot id this updates both the incore dqout as well
1032  * as the buffer copy. This is so that once the quotacheck is done, we can
1033  * just log all the buffers, as opposed to logging numerous updates to
1034  * individual dquots.
1035  */
1036 STATIC int
1037 xfs_qm_quotacheck_dqadjust(
1038         struct xfs_inode        *ip,
1039         xfs_dqid_t              id,
1040         uint                    type,
1041         xfs_qcnt_t              nblks,
1042         xfs_qcnt_t              rtblks)
1043 {
1044         struct xfs_mount        *mp = ip->i_mount;
1045         struct xfs_dquot        *dqp;
1046         int                     error;
1047
1048         error = xfs_qm_dqget(mp, ip, id, type,
1049                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1050         if (error) {
1051                 /*
1052                  * Shouldn't be able to turn off quotas here.
1053                  */
1054                 ASSERT(error != -ESRCH);
1055                 ASSERT(error != -ENOENT);
1056                 return error;
1057         }
1058
1059         trace_xfs_dqadjust(dqp);
1060
1061         /*
1062          * Adjust the inode count and the block count to reflect this inode's
1063          * resource usage.
1064          */
1065         be64_add_cpu(&dqp->q_core.d_icount, 1);
1066         dqp->q_res_icount++;
1067         if (nblks) {
1068                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1069                 dqp->q_res_bcount += nblks;
1070         }
1071         if (rtblks) {
1072                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1073                 dqp->q_res_rtbcount += rtblks;
1074         }
1075
1076         /*
1077          * Set default limits, adjust timers (since we changed usages)
1078          *
1079          * There are no timers for the default values set in the root dquot.
1080          */
1081         if (dqp->q_core.d_id) {
1082                 xfs_qm_adjust_dqlimits(mp, dqp);
1083                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1084         }
1085
1086         dqp->dq_flags |= XFS_DQ_DIRTY;
1087         xfs_qm_dqput(dqp);
1088         return 0;
1089 }
1090
1091 STATIC int
1092 xfs_qm_get_rtblks(
1093         xfs_inode_t     *ip,
1094         xfs_qcnt_t      *O_rtblks)
1095 {
1096         xfs_filblks_t   rtblks;                 /* total rt blks */
1097         xfs_extnum_t    idx;                    /* extent record index */
1098         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1099         xfs_extnum_t    nextents;               /* number of extent entries */
1100         int             error;
1101
1102         ASSERT(XFS_IS_REALTIME_INODE(ip));
1103         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1104         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1105                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1106                         return error;
1107         }
1108         rtblks = 0;
1109         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1110         for (idx = 0; idx < nextents; idx++)
1111                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1112         *O_rtblks = (xfs_qcnt_t)rtblks;
1113         return 0;
1114 }
1115
1116 /*
1117  * callback routine supplied to bulkstat(). Given an inumber, find its
1118  * dquots and update them to account for resources taken by that inode.
1119  */
1120 /* ARGSUSED */
1121 STATIC int
1122 xfs_qm_dqusage_adjust(
1123         xfs_mount_t     *mp,            /* mount point for filesystem */
1124         xfs_ino_t       ino,            /* inode number to get data for */
1125         void            __user *buffer, /* not used */
1126         int             ubsize,         /* not used */
1127         int             *ubused,        /* not used */
1128         int             *res)           /* result code value */
1129 {
1130         xfs_inode_t     *ip;
1131         xfs_qcnt_t      nblks, rtblks = 0;
1132         int             error;
1133
1134         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1135
1136         /*
1137          * rootino must have its resources accounted for, not so with the quota
1138          * inodes.
1139          */
1140         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1141                 *res = BULKSTAT_RV_NOTHING;
1142                 return -EINVAL;
1143         }
1144
1145         /*
1146          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1147          * interface expects the inode to be exclusively locked because that's
1148          * the case in all other instances. It's OK that we do this because
1149          * quotacheck is done only at mount time.
1150          */
1151         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1152         if (error) {
1153                 *res = BULKSTAT_RV_NOTHING;
1154                 return error;
1155         }
1156
1157         ASSERT(ip->i_delayed_blks == 0);
1158
1159         if (XFS_IS_REALTIME_INODE(ip)) {
1160                 /*
1161                  * Walk thru the extent list and count the realtime blocks.
1162                  */
1163                 error = xfs_qm_get_rtblks(ip, &rtblks);
1164                 if (error)
1165                         goto error0;
1166         }
1167
1168         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1169
1170         /*
1171          * Add the (disk blocks and inode) resources occupied by this
1172          * inode to its dquots. We do this adjustment in the incore dquot,
1173          * and also copy the changes to its buffer.
1174          * We don't care about putting these changes in a transaction
1175          * envelope because if we crash in the middle of a 'quotacheck'
1176          * we have to start from the beginning anyway.
1177          * Once we're done, we'll log all the dquot bufs.
1178          *
1179          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1180          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1181          */
1182         if (XFS_IS_UQUOTA_ON(mp)) {
1183                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1184                                                    XFS_DQ_USER, nblks, rtblks);
1185                 if (error)
1186                         goto error0;
1187         }
1188
1189         if (XFS_IS_GQUOTA_ON(mp)) {
1190                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1191                                                    XFS_DQ_GROUP, nblks, rtblks);
1192                 if (error)
1193                         goto error0;
1194         }
1195
1196         if (XFS_IS_PQUOTA_ON(mp)) {
1197                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1198                                                    XFS_DQ_PROJ, nblks, rtblks);
1199                 if (error)
1200                         goto error0;
1201         }
1202
1203         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1204         IRELE(ip);
1205         *res = BULKSTAT_RV_DIDONE;
1206         return 0;
1207
1208 error0:
1209         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1210         IRELE(ip);
1211         *res = BULKSTAT_RV_GIVEUP;
1212         return error;
1213 }
1214
1215 STATIC int
1216 xfs_qm_flush_one(
1217         struct xfs_dquot        *dqp,
1218         void                    *data)
1219 {
1220         struct list_head        *buffer_list = data;
1221         struct xfs_buf          *bp = NULL;
1222         int                     error = 0;
1223
1224         xfs_dqlock(dqp);
1225         if (dqp->dq_flags & XFS_DQ_FREEING)
1226                 goto out_unlock;
1227         if (!XFS_DQ_IS_DIRTY(dqp))
1228                 goto out_unlock;
1229
1230         xfs_dqflock(dqp);
1231         error = xfs_qm_dqflush(dqp, &bp);
1232         if (error)
1233                 goto out_unlock;
1234
1235         xfs_buf_delwri_queue(bp, buffer_list);
1236         xfs_buf_relse(bp);
1237 out_unlock:
1238         xfs_dqunlock(dqp);
1239         return error;
1240 }
1241
1242 /*
1243  * Walk thru all the filesystem inodes and construct a consistent view
1244  * of the disk quota world. If the quotacheck fails, disable quotas.
1245  */
1246 STATIC int
1247 xfs_qm_quotacheck(
1248         xfs_mount_t     *mp)
1249 {
1250         int                     done, count, error, error2;
1251         xfs_ino_t               lastino;
1252         size_t                  structsz;
1253         uint                    flags;
1254         LIST_HEAD               (buffer_list);
1255         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1256         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1257         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1258
1259         count = INT_MAX;
1260         structsz = 1;
1261         lastino = 0;
1262         flags = 0;
1263
1264         ASSERT(uip || gip || pip);
1265         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1266
1267         xfs_notice(mp, "Quotacheck needed: Please wait.");
1268
1269         /*
1270          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1271          * their counters to zero. We need a clean slate.
1272          * We don't log our changes till later.
1273          */
1274         if (uip) {
1275                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1276                                          &buffer_list);
1277                 if (error)
1278                         goto error_return;
1279                 flags |= XFS_UQUOTA_CHKD;
1280         }
1281
1282         if (gip) {
1283                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1284                                          &buffer_list);
1285                 if (error)
1286                         goto error_return;
1287                 flags |= XFS_GQUOTA_CHKD;
1288         }
1289
1290         if (pip) {
1291                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1292                                          &buffer_list);
1293                 if (error)
1294                         goto error_return;
1295                 flags |= XFS_PQUOTA_CHKD;
1296         }
1297
1298         do {
1299                 /*
1300                  * Iterate thru all the inodes in the file system,
1301                  * adjusting the corresponding dquot counters in core.
1302                  */
1303                 error = xfs_bulkstat(mp, &lastino, &count,
1304                                      xfs_qm_dqusage_adjust,
1305                                      structsz, NULL, &done);
1306                 if (error)
1307                         break;
1308
1309         } while (!done);
1310
1311         /*
1312          * We've made all the changes that we need to make incore.  Flush them
1313          * down to disk buffers if everything was updated successfully.
1314          */
1315         if (XFS_IS_UQUOTA_ON(mp)) {
1316                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1317                                           &buffer_list);
1318         }
1319         if (XFS_IS_GQUOTA_ON(mp)) {
1320                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1321                                            &buffer_list);
1322                 if (!error)
1323                         error = error2;
1324         }
1325         if (XFS_IS_PQUOTA_ON(mp)) {
1326                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1327                                            &buffer_list);
1328                 if (!error)
1329                         error = error2;
1330         }
1331
1332         error2 = xfs_buf_delwri_submit(&buffer_list);
1333         if (!error)
1334                 error = error2;
1335
1336         /*
1337          * We can get this error if we couldn't do a dquot allocation inside
1338          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1339          * dirty dquots that might be cached, we just want to get rid of them
1340          * and turn quotaoff. The dquots won't be attached to any of the inodes
1341          * at this point (because we intentionally didn't in dqget_noattach).
1342          */
1343         if (error) {
1344                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1345                 goto error_return;
1346         }
1347
1348         /*
1349          * If one type of quotas is off, then it will lose its
1350          * quotachecked status, since we won't be doing accounting for
1351          * that type anymore.
1352          */
1353         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1354         mp->m_qflags |= flags;
1355
1356  error_return:
1357         while (!list_empty(&buffer_list)) {
1358                 struct xfs_buf *bp =
1359                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1360                 list_del_init(&bp->b_list);
1361                 xfs_buf_relse(bp);
1362         }
1363
1364         if (error) {
1365                 xfs_warn(mp,
1366         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1367                         error);
1368                 /*
1369                  * We must turn off quotas.
1370                  */
1371                 ASSERT(mp->m_quotainfo != NULL);
1372                 xfs_qm_destroy_quotainfo(mp);
1373                 if (xfs_mount_reset_sbqflags(mp)) {
1374                         xfs_warn(mp,
1375                                 "Quotacheck: Failed to reset quota flags.");
1376                 }
1377         } else
1378                 xfs_notice(mp, "Quotacheck: Done.");
1379         return error;
1380 }
1381
1382 /*
1383  * This is called from xfs_mountfs to start quotas and initialize all
1384  * necessary data structures like quotainfo.  This is also responsible for
1385  * running a quotacheck as necessary.  We are guaranteed that the superblock
1386  * is consistently read in at this point.
1387  *
1388  * If we fail here, the mount will continue with quota turned off. We don't
1389  * need to inidicate success or failure at all.
1390  */
1391 void
1392 xfs_qm_mount_quotas(
1393         struct xfs_mount        *mp)
1394 {
1395         int                     error = 0;
1396         uint                    sbf;
1397
1398         /*
1399          * If quotas on realtime volumes is not supported, we disable
1400          * quotas immediately.
1401          */
1402         if (mp->m_sb.sb_rextents) {
1403                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1404                 mp->m_qflags = 0;
1405                 goto write_changes;
1406         }
1407
1408         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1409
1410         /*
1411          * Allocate the quotainfo structure inside the mount struct, and
1412          * create quotainode(s), and change/rev superblock if necessary.
1413          */
1414         error = xfs_qm_init_quotainfo(mp);
1415         if (error) {
1416                 /*
1417                  * We must turn off quotas.
1418                  */
1419                 ASSERT(mp->m_quotainfo == NULL);
1420                 mp->m_qflags = 0;
1421                 goto write_changes;
1422         }
1423         /*
1424          * If any of the quotas are not consistent, do a quotacheck.
1425          */
1426         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1427                 error = xfs_qm_quotacheck(mp);
1428                 if (error) {
1429                         /* Quotacheck failed and disabled quotas. */
1430                         return;
1431                 }
1432         }
1433         /*
1434          * If one type of quotas is off, then it will lose its
1435          * quotachecked status, since we won't be doing accounting for
1436          * that type anymore.
1437          */
1438         if (!XFS_IS_UQUOTA_ON(mp))
1439                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1440         if (!XFS_IS_GQUOTA_ON(mp))
1441                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1442         if (!XFS_IS_PQUOTA_ON(mp))
1443                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1444
1445  write_changes:
1446         /*
1447          * We actually don't have to acquire the m_sb_lock at all.
1448          * This can only be called from mount, and that's single threaded. XXX
1449          */
1450         spin_lock(&mp->m_sb_lock);
1451         sbf = mp->m_sb.sb_qflags;
1452         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1453         spin_unlock(&mp->m_sb_lock);
1454
1455         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1456                 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
1457                         /*
1458                          * We could only have been turning quotas off.
1459                          * We aren't in very good shape actually because
1460                          * the incore structures are convinced that quotas are
1461                          * off, but the on disk superblock doesn't know that !
1462                          */
1463                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1464                         xfs_alert(mp, "%s: Superblock update failed!",
1465                                 __func__);
1466                 }
1467         }
1468
1469         if (error) {
1470                 xfs_warn(mp, "Failed to initialize disk quotas.");
1471                 return;
1472         }
1473 }
1474
1475 /*
1476  * This is called after the superblock has been read in and we're ready to
1477  * iget the quota inodes.
1478  */
1479 STATIC int
1480 xfs_qm_init_quotainos(
1481         xfs_mount_t     *mp)
1482 {
1483         struct xfs_inode        *uip = NULL;
1484         struct xfs_inode        *gip = NULL;
1485         struct xfs_inode        *pip = NULL;
1486         int                     error;
1487         __int64_t               sbflags = 0;
1488         uint                    flags = 0;
1489
1490         ASSERT(mp->m_quotainfo);
1491
1492         /*
1493          * Get the uquota and gquota inodes
1494          */
1495         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1496                 if (XFS_IS_UQUOTA_ON(mp) &&
1497                     mp->m_sb.sb_uquotino != NULLFSINO) {
1498                         ASSERT(mp->m_sb.sb_uquotino > 0);
1499                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1500                                              0, 0, &uip);
1501                         if (error)
1502                                 return error;
1503                 }
1504                 if (XFS_IS_GQUOTA_ON(mp) &&
1505                     mp->m_sb.sb_gquotino != NULLFSINO) {
1506                         ASSERT(mp->m_sb.sb_gquotino > 0);
1507                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1508                                              0, 0, &gip);
1509                         if (error)
1510                                 goto error_rele;
1511                 }
1512                 if (XFS_IS_PQUOTA_ON(mp) &&
1513                     mp->m_sb.sb_pquotino != NULLFSINO) {
1514                         ASSERT(mp->m_sb.sb_pquotino > 0);
1515                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1516                                              0, 0, &pip);
1517                         if (error)
1518                                 goto error_rele;
1519                 }
1520         } else {
1521                 flags |= XFS_QMOPT_SBVERSION;
1522                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1523                             XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
1524                             XFS_SB_QFLAGS);
1525         }
1526
1527         /*
1528          * Create the three inodes, if they don't exist already. The changes
1529          * made above will get added to a transaction and logged in one of
1530          * the qino_alloc calls below.  If the device is readonly,
1531          * temporarily switch to read-write to do this.
1532          */
1533         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1534                 error = xfs_qm_qino_alloc(mp, &uip,
1535                                               sbflags | XFS_SB_UQUOTINO,
1536                                               flags | XFS_QMOPT_UQUOTA);
1537                 if (error)
1538                         goto error_rele;
1539
1540                 flags &= ~XFS_QMOPT_SBVERSION;
1541         }
1542         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1543                 error = xfs_qm_qino_alloc(mp, &gip,
1544                                           sbflags | XFS_SB_GQUOTINO,
1545                                           flags | XFS_QMOPT_GQUOTA);
1546                 if (error)
1547                         goto error_rele;
1548
1549                 flags &= ~XFS_QMOPT_SBVERSION;
1550         }
1551         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1552                 error = xfs_qm_qino_alloc(mp, &pip,
1553                                           sbflags | XFS_SB_PQUOTINO,
1554                                           flags | XFS_QMOPT_PQUOTA);
1555                 if (error)
1556                         goto error_rele;
1557         }
1558
1559         mp->m_quotainfo->qi_uquotaip = uip;
1560         mp->m_quotainfo->qi_gquotaip = gip;
1561         mp->m_quotainfo->qi_pquotaip = pip;
1562
1563         return 0;
1564
1565 error_rele:
1566         if (uip)
1567                 IRELE(uip);
1568         if (gip)
1569                 IRELE(gip);
1570         if (pip)
1571                 IRELE(pip);
1572         return error;
1573 }
1574
1575 STATIC void
1576 xfs_qm_dqfree_one(
1577         struct xfs_dquot        *dqp)
1578 {
1579         struct xfs_mount        *mp = dqp->q_mount;
1580         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1581
1582         mutex_lock(&qi->qi_tree_lock);
1583         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1584                           be32_to_cpu(dqp->q_core.d_id));
1585
1586         qi->qi_dquots--;
1587         mutex_unlock(&qi->qi_tree_lock);
1588
1589         xfs_qm_dqdestroy(dqp);
1590 }
1591
1592 /*
1593  * Start a transaction and write the incore superblock changes to
1594  * disk. flags parameter indicates which fields have changed.
1595  */
1596 int
1597 xfs_qm_write_sb_changes(
1598         xfs_mount_t     *mp,
1599         __int64_t       flags)
1600 {
1601         xfs_trans_t     *tp;
1602         int             error;
1603
1604         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1605         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_sbchange, 0, 0);
1606         if (error) {
1607                 xfs_trans_cancel(tp, 0);
1608                 return error;
1609         }
1610
1611         xfs_mod_sb(tp, flags);
1612         error = xfs_trans_commit(tp, 0);
1613
1614         return error;
1615 }
1616
1617
1618 /* --------------- utility functions for vnodeops ---------------- */
1619
1620
1621 /*
1622  * Given an inode, a uid, gid and prid make sure that we have
1623  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1624  * quotas by creating this file.
1625  * This also attaches dquot(s) to the given inode after locking it,
1626  * and returns the dquots corresponding to the uid and/or gid.
1627  *
1628  * in   : inode (unlocked)
1629  * out  : udquot, gdquot with references taken and unlocked
1630  */
1631 int
1632 xfs_qm_vop_dqalloc(
1633         struct xfs_inode        *ip,
1634         xfs_dqid_t              uid,
1635         xfs_dqid_t              gid,
1636         prid_t                  prid,
1637         uint                    flags,
1638         struct xfs_dquot        **O_udqpp,
1639         struct xfs_dquot        **O_gdqpp,
1640         struct xfs_dquot        **O_pdqpp)
1641 {
1642         struct xfs_mount        *mp = ip->i_mount;
1643         struct xfs_dquot        *uq = NULL;
1644         struct xfs_dquot        *gq = NULL;
1645         struct xfs_dquot        *pq = NULL;
1646         int                     error;
1647         uint                    lockflags;
1648
1649         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1650                 return 0;
1651
1652         lockflags = XFS_ILOCK_EXCL;
1653         xfs_ilock(ip, lockflags);
1654
1655         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1656                 gid = ip->i_d.di_gid;
1657
1658         /*
1659          * Attach the dquot(s) to this inode, doing a dquot allocation
1660          * if necessary. The dquot(s) will not be locked.
1661          */
1662         if (XFS_NOT_DQATTACHED(mp, ip)) {
1663                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1664                 if (error) {
1665                         xfs_iunlock(ip, lockflags);
1666                         return error;
1667                 }
1668         }
1669
1670         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1671                 if (ip->i_d.di_uid != uid) {
1672                         /*
1673                          * What we need is the dquot that has this uid, and
1674                          * if we send the inode to dqget, the uid of the inode
1675                          * takes priority over what's sent in the uid argument.
1676                          * We must unlock inode here before calling dqget if
1677                          * we're not sending the inode, because otherwise
1678                          * we'll deadlock by doing trans_reserve while
1679                          * holding ilock.
1680                          */
1681                         xfs_iunlock(ip, lockflags);
1682                         error = xfs_qm_dqget(mp, NULL, uid,
1683                                                  XFS_DQ_USER,
1684                                                  XFS_QMOPT_DQALLOC |
1685                                                  XFS_QMOPT_DOWARN,
1686                                                  &uq);
1687                         if (error) {
1688                                 ASSERT(error != -ENOENT);
1689                                 return error;
1690                         }
1691                         /*
1692                          * Get the ilock in the right order.
1693                          */
1694                         xfs_dqunlock(uq);
1695                         lockflags = XFS_ILOCK_SHARED;
1696                         xfs_ilock(ip, lockflags);
1697                 } else {
1698                         /*
1699                          * Take an extra reference, because we'll return
1700                          * this to caller
1701                          */
1702                         ASSERT(ip->i_udquot);
1703                         uq = xfs_qm_dqhold(ip->i_udquot);
1704                 }
1705         }
1706         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1707                 if (ip->i_d.di_gid != gid) {
1708                         xfs_iunlock(ip, lockflags);
1709                         error = xfs_qm_dqget(mp, NULL, gid,
1710                                                  XFS_DQ_GROUP,
1711                                                  XFS_QMOPT_DQALLOC |
1712                                                  XFS_QMOPT_DOWARN,
1713                                                  &gq);
1714                         if (error) {
1715                                 ASSERT(error != -ENOENT);
1716                                 goto error_rele;
1717                         }
1718                         xfs_dqunlock(gq);
1719                         lockflags = XFS_ILOCK_SHARED;
1720                         xfs_ilock(ip, lockflags);
1721                 } else {
1722                         ASSERT(ip->i_gdquot);
1723                         gq = xfs_qm_dqhold(ip->i_gdquot);
1724                 }
1725         }
1726         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1727                 if (xfs_get_projid(ip) != prid) {
1728                         xfs_iunlock(ip, lockflags);
1729                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1730                                                  XFS_DQ_PROJ,
1731                                                  XFS_QMOPT_DQALLOC |
1732                                                  XFS_QMOPT_DOWARN,
1733                                                  &pq);
1734                         if (error) {
1735                                 ASSERT(error != -ENOENT);
1736                                 goto error_rele;
1737                         }
1738                         xfs_dqunlock(pq);
1739                         lockflags = XFS_ILOCK_SHARED;
1740                         xfs_ilock(ip, lockflags);
1741                 } else {
1742                         ASSERT(ip->i_pdquot);
1743                         pq = xfs_qm_dqhold(ip->i_pdquot);
1744                 }
1745         }
1746         if (uq)
1747                 trace_xfs_dquot_dqalloc(ip);
1748
1749         xfs_iunlock(ip, lockflags);
1750         if (O_udqpp)
1751                 *O_udqpp = uq;
1752         else if (uq)
1753                 xfs_qm_dqrele(uq);
1754         if (O_gdqpp)
1755                 *O_gdqpp = gq;
1756         else if (gq)
1757                 xfs_qm_dqrele(gq);
1758         if (O_pdqpp)
1759                 *O_pdqpp = pq;
1760         else if (pq)
1761                 xfs_qm_dqrele(pq);
1762         return 0;
1763
1764 error_rele:
1765         if (gq)
1766                 xfs_qm_dqrele(gq);
1767         if (uq)
1768                 xfs_qm_dqrele(uq);
1769         return error;
1770 }
1771
1772 /*
1773  * Actually transfer ownership, and do dquot modifications.
1774  * These were already reserved.
1775  */
1776 xfs_dquot_t *
1777 xfs_qm_vop_chown(
1778         xfs_trans_t     *tp,
1779         xfs_inode_t     *ip,
1780         xfs_dquot_t     **IO_olddq,
1781         xfs_dquot_t     *newdq)
1782 {
1783         xfs_dquot_t     *prevdq;
1784         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1785                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1786
1787
1788         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1789         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1790
1791         /* old dquot */
1792         prevdq = *IO_olddq;
1793         ASSERT(prevdq);
1794         ASSERT(prevdq != newdq);
1795
1796         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1797         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1798
1799         /* the sparkling new dquot */
1800         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1801         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1802
1803         /*
1804          * Take an extra reference, because the inode is going to keep
1805          * this dquot pointer even after the trans_commit.
1806          */
1807         *IO_olddq = xfs_qm_dqhold(newdq);
1808
1809         return prevdq;
1810 }
1811
1812 /*
1813  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1814  */
1815 int
1816 xfs_qm_vop_chown_reserve(
1817         struct xfs_trans        *tp,
1818         struct xfs_inode        *ip,
1819         struct xfs_dquot        *udqp,
1820         struct xfs_dquot        *gdqp,
1821         struct xfs_dquot        *pdqp,
1822         uint                    flags)
1823 {
1824         struct xfs_mount        *mp = ip->i_mount;
1825         uint                    delblks, blkflags, prjflags = 0;
1826         struct xfs_dquot        *udq_unres = NULL;
1827         struct xfs_dquot        *gdq_unres = NULL;
1828         struct xfs_dquot        *pdq_unres = NULL;
1829         struct xfs_dquot        *udq_delblks = NULL;
1830         struct xfs_dquot        *gdq_delblks = NULL;
1831         struct xfs_dquot        *pdq_delblks = NULL;
1832         int                     error;
1833
1834
1835         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1836         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1837
1838         delblks = ip->i_delayed_blks;
1839         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1840                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1841
1842         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1843             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1844                 udq_delblks = udqp;
1845                 /*
1846                  * If there are delayed allocation blocks, then we have to
1847                  * unreserve those from the old dquot, and add them to the
1848                  * new dquot.
1849                  */
1850                 if (delblks) {
1851                         ASSERT(ip->i_udquot);
1852                         udq_unres = ip->i_udquot;
1853                 }
1854         }
1855         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1856             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1857                 gdq_delblks = gdqp;
1858                 if (delblks) {
1859                         ASSERT(ip->i_gdquot);
1860                         gdq_unres = ip->i_gdquot;
1861                 }
1862         }
1863
1864         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1865             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1866                 prjflags = XFS_QMOPT_ENOSPC;
1867                 pdq_delblks = pdqp;
1868                 if (delblks) {
1869                         ASSERT(ip->i_pdquot);
1870                         pdq_unres = ip->i_pdquot;
1871                 }
1872         }
1873
1874         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1875                                 udq_delblks, gdq_delblks, pdq_delblks,
1876                                 ip->i_d.di_nblocks, 1,
1877                                 flags | blkflags | prjflags);
1878         if (error)
1879                 return error;
1880
1881         /*
1882          * Do the delayed blks reservations/unreservations now. Since, these
1883          * are done without the help of a transaction, if a reservation fails
1884          * its previous reservations won't be automatically undone by trans
1885          * code. So, we have to do it manually here.
1886          */
1887         if (delblks) {
1888                 /*
1889                  * Do the reservations first. Unreservation can't fail.
1890                  */
1891                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1892                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1893                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1894                             udq_delblks, gdq_delblks, pdq_delblks,
1895                             (xfs_qcnt_t)delblks, 0,
1896                             flags | blkflags | prjflags);
1897                 if (error)
1898                         return error;
1899                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1900                                 udq_unres, gdq_unres, pdq_unres,
1901                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1902         }
1903
1904         return 0;
1905 }
1906
1907 int
1908 xfs_qm_vop_rename_dqattach(
1909         struct xfs_inode        **i_tab)
1910 {
1911         struct xfs_mount        *mp = i_tab[0]->i_mount;
1912         int                     i;
1913
1914         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1915                 return 0;
1916
1917         for (i = 0; (i < 4 && i_tab[i]); i++) {
1918                 struct xfs_inode        *ip = i_tab[i];
1919                 int                     error;
1920
1921                 /*
1922                  * Watch out for duplicate entries in the table.
1923                  */
1924                 if (i == 0 || ip != i_tab[i-1]) {
1925                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1926                                 error = xfs_qm_dqattach(ip, 0);
1927                                 if (error)
1928                                         return error;
1929                         }
1930                 }
1931         }
1932         return 0;
1933 }
1934
1935 void
1936 xfs_qm_vop_create_dqattach(
1937         struct xfs_trans        *tp,
1938         struct xfs_inode        *ip,
1939         struct xfs_dquot        *udqp,
1940         struct xfs_dquot        *gdqp,
1941         struct xfs_dquot        *pdqp)
1942 {
1943         struct xfs_mount        *mp = tp->t_mountp;
1944
1945         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1946                 return;
1947
1948         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1949         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1950
1951         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1952                 ASSERT(ip->i_udquot == NULL);
1953                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1954
1955                 ip->i_udquot = xfs_qm_dqhold(udqp);
1956                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1957         }
1958         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1959                 ASSERT(ip->i_gdquot == NULL);
1960                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1961                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1962                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1963         }
1964         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1965                 ASSERT(ip->i_pdquot == NULL);
1966                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1967
1968                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1969                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1970         }
1971 }
1972