fs/xfs/xfs_qm.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_inode.h"
  28 #include "xfs_ialloc.h"
  29 #include "xfs_itable.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_error.h"
  32 #include "xfs_bmap.h"
  33 #include "xfs_bmap_btree.h"
  34 #include "xfs_trans.h"
  35 #include "xfs_trans_space.h"
  36 #include "xfs_qm.h"
  37 #include "xfs_trace.h"
  38 #include "xfs_icache.h"
  39 #include "xfs_cksum.h"
  40
  41 /*
  42  * The global quota manager. There is only one of these for the entire
  43  * system, _not_ one per file system. XQM keeps track of the overall
  44  * quota functionality, including maintaining the freelist and hash
  45  * tables of dquots.
  46  */
  47 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  48 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  49
  50
  51 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  52 /*
  53  * We use the batch lookup interface to iterate over the dquots as it
  54  * currently is the only interface into the radix tree code that allows
  55  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  56  * operations is fine as all callers are used either during mount/umount
  57  * or quotaoff.
  58  */
  59 #define XFS_DQ_LOOKUP_BATCH     32
  60
  61 STATIC int
  62 xfs_qm_dquot_walk(
  63         struct xfs_mount        *mp,
  64         int                     type,
  65         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  66         void                    *data)
  67 {
  68         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  69         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  70         uint32_t                next_index;
  71         int                     last_error = 0;
  72         int                     skipped;
  73         int                     nr_found;
  74
  75 restart:
  76         skipped = 0;
  77         next_index = 0;
  78         nr_found = 0;
  79
  80         while (1) {
  81                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  82                 int             error = 0;
  83                 int             i;
  84
  85                 mutex_lock(&qi->qi_tree_lock);
  86                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  87                                         next_index, XFS_DQ_LOOKUP_BATCH);
  88                 if (!nr_found) {
  89                         mutex_unlock(&qi->qi_tree_lock);
  90                         break;
  91                 }
  92
  93                 for (i = 0; i < nr_found; i++) {
  94                         struct xfs_dquot *dqp = batch[i];
  95
  96                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  97
  98                         error = execute(batch[i], data);
  99                         if (error == -EAGAIN) {
 100                                 skipped++;
 101                                 continue;
 102                         }
 103                         if (error && last_error != -EFSCORRUPTED)
 104                                 last_error = error;
 105                 }
 106
 107                 mutex_unlock(&qi->qi_tree_lock);
 108
 109                 /* bail out if the filesystem is corrupted.  */
 110                 if (last_error == -EFSCORRUPTED) {
 111                         skipped = 0;
 112                         break;
 113                 }
 114         }
 115
 116         if (skipped) {
 117                 delay(1);
 118                 goto restart;
 119         }
 120
 121         return last_error;
 122 }
 123
 124
 125 /*
 126  * Purge a dquot from all tracking data structures and free it.
 127  */
 128 STATIC int
 129 xfs_qm_dqpurge(
 130         struct xfs_dquot        *dqp,
 131         void                    *data)
 132 {
 133         struct xfs_mount        *mp = dqp->q_mount;
 134         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 135
 136         xfs_dqlock(dqp);
 137         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 138                 xfs_dqunlock(dqp);
 139                 return -EAGAIN;
 140         }
 141
 142         dqp->dq_flags |= XFS_DQ_FREEING;
 143
 144         xfs_dqflock(dqp);
 145
 146         /*
 147          * If we are turning this type of quotas off, we don't care
 148          * about the dirty metadata sitting in this dquot. OTOH, if
 149          * we're unmounting, we do care, so we flush it and wait.
 150          */
 151         if (XFS_DQ_IS_DIRTY(dqp)) {
 152                 struct xfs_buf  *bp = NULL;
 153                 int             error;
 154
 155                 /*
 156                  * We don't care about getting disk errors here. We need
 157                  * to purge this dquot anyway, so we go ahead regardless.
 158                  */
 159                 error = xfs_qm_dqflush(dqp, &bp);
 160                 if (error) {
 161                         xfs_warn(mp, "%s: dquot %p flush failed",
 162                                 __func__, dqp);
 163                 } else {
 164                         error = xfs_bwrite(bp);
 165                         xfs_buf_relse(bp);
 166                 }
 167                 xfs_dqflock(dqp);
 168         }
 169
 170         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 171         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 172                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 173
 174         xfs_dqfunlock(dqp);
 175         xfs_dqunlock(dqp);
 176
 177         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 178                           be32_to_cpu(dqp->q_core.d_id));
 179         qi->qi_dquots--;
 180
 181         /*
 182          * We move dquots to the freelist as soon as their reference count
 183          * hits zero, so it really should be on the freelist here.
 184          */
 185         ASSERT(!list_empty(&dqp->q_lru));
 186         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 187         XFS_STATS_DEC(xs_qm_dquot_unused);
 188
 189         xfs_qm_dqdestroy(dqp);
 190         return 0;
 191 }
 192
 193 /*
 194  * Purge the dquot cache.
 195  */
 196 void
 197 xfs_qm_dqpurge_all(
 198         struct xfs_mount        *mp,
 199         uint                    flags)
 200 {
 201         if (flags & XFS_QMOPT_UQUOTA)
 202                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 203         if (flags & XFS_QMOPT_GQUOTA)
 204                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 205         if (flags & XFS_QMOPT_PQUOTA)
 206                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 207 }
 208
 209 /*
 210  * Just destroy the quotainfo structure.
 211  */
 212 void
 213 xfs_qm_unmount(
 214         struct xfs_mount        *mp)
 215 {
 216         if (mp->m_quotainfo) {
 217                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 218                 xfs_qm_destroy_quotainfo(mp);
 219         }
 220 }
 221
 222 /*
 223  * Called from the vfsops layer.
 224  */
 225 void
 226 xfs_qm_unmount_quotas(
 227         xfs_mount_t     *mp)
 228 {
 229         /*
 230          * Release the dquots that root inode, et al might be holding,
 231          * before we flush quotas and blow away the quotainfo structure.
 232          */
 233         ASSERT(mp->m_rootip);
 234         xfs_qm_dqdetach(mp->m_rootip);
 235         if (mp->m_rbmip)
 236                 xfs_qm_dqdetach(mp->m_rbmip);
 237         if (mp->m_rsumip)
 238                 xfs_qm_dqdetach(mp->m_rsumip);
 239
 240         /*
 241          * Release the quota inodes.
 242          */
 243         if (mp->m_quotainfo) {
 244                 if (mp->m_quotainfo->qi_uquotaip) {
 245                         IRELE(mp->m_quotainfo->qi_uquotaip);
 246                         mp->m_quotainfo->qi_uquotaip = NULL;
 247                 }
 248                 if (mp->m_quotainfo->qi_gquotaip) {
 249                         IRELE(mp->m_quotainfo->qi_gquotaip);
 250                         mp->m_quotainfo->qi_gquotaip = NULL;
 251                 }
 252                 if (mp->m_quotainfo->qi_pquotaip) {
 253                         IRELE(mp->m_quotainfo->qi_pquotaip);
 254                         mp->m_quotainfo->qi_pquotaip = NULL;
 255                 }
 256         }
 257 }
 258
 259 STATIC int
 260 xfs_qm_dqattach_one(
 261         xfs_inode_t     *ip,
 262         xfs_dqid_t      id,
 263         uint            type,
 264         uint            doalloc,
 265         xfs_dquot_t     **IO_idqpp)
 266 {
 267         xfs_dquot_t     *dqp;
 268         int             error;
 269
 270         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 271         error = 0;
 272
 273         /*
 274          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 275          * or &i_gdquot. This made the code look weird, but made the logic a lot
 276          * simpler.
 277          */
 278         dqp = *IO_idqpp;
 279         if (dqp) {
 280                 trace_xfs_dqattach_found(dqp);
 281                 return 0;
 282         }
 283
 284         /*
 285          * Find the dquot from somewhere. This bumps the reference count of
 286          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 287          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 288          * turned off suddenly.
 289          */
 290         error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 291                              doalloc | XFS_QMOPT_DOWARN, &dqp);
 292         if (error)
 293                 return error;
 294
 295         trace_xfs_dqattach_get(dqp);
 296
 297         /*
 298          * dqget may have dropped and re-acquired the ilock, but it guarantees
 299          * that the dquot returned is the one that should go in the inode.
 300          */
 301         *IO_idqpp = dqp;
 302         xfs_dqunlock(dqp);
 303         return 0;
 304 }
 305
 306 static bool
 307 xfs_qm_need_dqattach(
 308         struct xfs_inode        *ip)
 309 {
 310         struct xfs_mount        *mp = ip->i_mount;
 311
 312         if (!XFS_IS_QUOTA_RUNNING(mp))
 313                 return false;
 314         if (!XFS_IS_QUOTA_ON(mp))
 315                 return false;
 316         if (!XFS_NOT_DQATTACHED(mp, ip))
 317                 return false;
 318         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 319                 return false;
 320         return true;
 321 }
 322
 323 /*
 324  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 325  * into account.
 326  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 327  * Inode may get unlocked and relocked in here, and the caller must deal with
 328  * the consequences.
 329  */
 330 int
 331 xfs_qm_dqattach_locked(
 332         xfs_inode_t     *ip,
 333         uint            flags)
 334 {
 335         xfs_mount_t     *mp = ip->i_mount;
 336         int             error = 0;
 337
 338         if (!xfs_qm_need_dqattach(ip))
 339                 return 0;
 340
 341         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 342
 343         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 344                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 345                                                 flags & XFS_QMOPT_DQALLOC,
 346                                                 &ip->i_udquot);
 347                 if (error)
 348                         goto done;
 349                 ASSERT(ip->i_udquot);
 350         }
 351
 352         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 353                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 354                                                 flags & XFS_QMOPT_DQALLOC,
 355                                                 &ip->i_gdquot);
 356                 if (error)
 357                         goto done;
 358                 ASSERT(ip->i_gdquot);
 359         }
 360
 361         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 362                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 363                                                 flags & XFS_QMOPT_DQALLOC,
 364                                                 &ip->i_pdquot);
 365                 if (error)
 366                         goto done;
 367                 ASSERT(ip->i_pdquot);
 368         }
 369
 370 done:
 371         /*
 372          * Don't worry about the dquots that we may have attached before any
 373          * error - they'll get detached later if it has not already been done.
 374          */
 375         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 376         return error;
 377 }
 378
 379 int
 380 xfs_qm_dqattach(
 381         struct xfs_inode        *ip,
 382         uint                    flags)
 383 {
 384         int                     error;
 385
 386         if (!xfs_qm_need_dqattach(ip))
 387                 return 0;
 388
 389         xfs_ilock(ip, XFS_ILOCK_EXCL);
 390         error = xfs_qm_dqattach_locked(ip, flags);
 391         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 392
 393         return error;
 394 }
 395
 396 /*
 397  * Release dquots (and their references) if any.
 398  * The inode should be locked EXCL except when this's called by
 399  * xfs_ireclaim.
 400  */
 401 void
 402 xfs_qm_dqdetach(
 403         xfs_inode_t     *ip)
 404 {
 405         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 406                 return;
 407
 408         trace_xfs_dquot_dqdetach(ip);
 409
 410         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 411         if (ip->i_udquot) {
 412                 xfs_qm_dqrele(ip->i_udquot);
 413                 ip->i_udquot = NULL;
 414         }
 415         if (ip->i_gdquot) {
 416                 xfs_qm_dqrele(ip->i_gdquot);
 417                 ip->i_gdquot = NULL;
 418         }
 419         if (ip->i_pdquot) {
 420                 xfs_qm_dqrele(ip->i_pdquot);
 421                 ip->i_pdquot = NULL;
 422         }
 423 }
 424
 425 struct xfs_qm_isolate {
 426         struct list_head        buffers;
 427         struct list_head        dispose;
 428 };
 429
 430 static enum lru_status
 431 xfs_qm_dquot_isolate(
 432         struct list_head        *item,
 433         spinlock_t              *lru_lock,
 434         void                    *arg)
 435                 __releases(lru_lock) __acquires(lru_lock)
 436 {
 437         struct xfs_dquot        *dqp = container_of(item,
 438                                                 struct xfs_dquot, q_lru);
 439         struct xfs_qm_isolate   *isol = arg;
 440
 441         if (!xfs_dqlock_nowait(dqp))
 442                 goto out_miss_busy;
 443
 444         /*
 445          * This dquot has acquired a reference in the meantime remove it from
 446          * the freelist and try again.
 447          */
 448         if (dqp->q_nrefs) {
 449                 xfs_dqunlock(dqp);
 450                 XFS_STATS_INC(xs_qm_dqwants);
 451
 452                 trace_xfs_dqreclaim_want(dqp);
 453                 list_del_init(&dqp->q_lru);
 454                 XFS_STATS_DEC(xs_qm_dquot_unused);
 455                 return LRU_REMOVED;
 456         }
 457
 458         /*
 459          * If the dquot is dirty, flush it. If it's already being flushed, just
 460          * skip it so there is time for the IO to complete before we try to
 461          * reclaim it again on the next LRU pass.
 462          */
 463         if (!xfs_dqflock_nowait(dqp)) {
 464                 xfs_dqunlock(dqp);
 465                 goto out_miss_busy;
 466         }
 467
 468         if (XFS_DQ_IS_DIRTY(dqp)) {
 469                 struct xfs_buf  *bp = NULL;
 470                 int             error;
 471
 472                 trace_xfs_dqreclaim_dirty(dqp);
 473
 474                 /* we have to drop the LRU lock to flush the dquot */
 475                 spin_unlock(lru_lock);
 476
 477                 error = xfs_qm_dqflush(dqp, &bp);
 478                 if (error) {
 479                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 480                                  __func__, dqp);
 481                         goto out_unlock_dirty;
 482                 }
 483
 484                 xfs_buf_delwri_queue(bp, &isol->buffers);
 485                 xfs_buf_relse(bp);
 486                 goto out_unlock_dirty;
 487         }
 488         xfs_dqfunlock(dqp);
 489
 490         /*
 491          * Prevent lookups now that we are past the point of no return.
 492          */
 493         dqp->dq_flags |= XFS_DQ_FREEING;
 494         xfs_dqunlock(dqp);
 495
 496         ASSERT(dqp->q_nrefs == 0);
 497         list_move_tail(&dqp->q_lru, &isol->dispose);
 498         XFS_STATS_DEC(xs_qm_dquot_unused);
 499         trace_xfs_dqreclaim_done(dqp);
 500         XFS_STATS_INC(xs_qm_dqreclaims);
 501         return LRU_REMOVED;
 502
 503 out_miss_busy:
 504         trace_xfs_dqreclaim_busy(dqp);
 505         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 506         return LRU_SKIP;
 507
 508 out_unlock_dirty:
 509         trace_xfs_dqreclaim_busy(dqp);
 510         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 511         xfs_dqunlock(dqp);
 512         spin_lock(lru_lock);
 513         return LRU_RETRY;
 514 }
 515
 516 static unsigned long
 517 xfs_qm_shrink_scan(
 518         struct shrinker         *shrink,
 519         struct shrink_control   *sc)
 520 {
 521         struct xfs_quotainfo    *qi = container_of(shrink,
 522                                         struct xfs_quotainfo, qi_shrinker);
 523         struct xfs_qm_isolate   isol;
 524         unsigned long           freed;
 525         int                     error;
 526         unsigned long           nr_to_scan = sc->nr_to_scan;
 527
 528         if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
 529                 return 0;
 530
 531         INIT_LIST_HEAD(&isol.buffers);
 532         INIT_LIST_HEAD(&isol.dispose);
 533
 534         freed = list_lru_walk_node(&qi->qi_lru, sc->nid, xfs_qm_dquot_isolate, &isol,
 535                                         &nr_to_scan);
 536
 537         error = xfs_buf_delwri_submit(&isol.buffers);
 538         if (error)
 539                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 540
 541         while (!list_empty(&isol.dispose)) {
 542                 struct xfs_dquot        *dqp;
 543
 544                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 545                 list_del_init(&dqp->q_lru);
 546                 xfs_qm_dqfree_one(dqp);
 547         }
 548
 549         return freed;
 550 }
 551
 552 static unsigned long
 553 xfs_qm_shrink_count(
 554         struct shrinker         *shrink,
 555         struct shrink_control   *sc)
 556 {
 557         struct xfs_quotainfo    *qi = container_of(shrink,
 558                                         struct xfs_quotainfo, qi_shrinker);
 559
 560         return list_lru_count_node(&qi->qi_lru, sc->nid);
 561 }
 562
 563 /*
 564  * This initializes all the quota information that's kept in the
 565  * mount structure
 566  */
 567 STATIC int
 568 xfs_qm_init_quotainfo(
 569         xfs_mount_t     *mp)
 570 {
 571         xfs_quotainfo_t *qinf;
 572         int             error;
 573         xfs_dquot_t     *dqp;
 574
 575         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 576
 577         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 578
 579         error = list_lru_init(&qinf->qi_lru);
 580         if (error)
 581                 goto out_free_qinf;
 582
 583         /*
 584          * See if quotainodes are setup, and if not, allocate them,
 585          * and change the superblock accordingly.
 586          */
 587         error = xfs_qm_init_quotainos(mp);
 588         if (error)
 589                 goto out_free_lru;
 590
 591         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 592         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 593         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 594         mutex_init(&qinf->qi_tree_lock);
 595
 596         /* mutex used to serialize quotaoffs */
 597         mutex_init(&qinf->qi_quotaofflock);
 598
 599         /* Precalc some constants */
 600         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 601         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 602
 603         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 604
 605         /*
 606          * We try to get the limits from the superuser's limits fields.
 607          * This is quite hacky, but it is standard quota practice.
 608          *
 609          * We look at the USR dquot with id == 0 first, but if user quotas
 610          * are not enabled we goto the GRP dquot with id == 0.
 611          * We don't really care to keep separate default limits for user
 612          * and group quotas, at least not at this point.
 613          *
 614          * Since we may not have done a quotacheck by this point, just read
 615          * the dquot without attaching it to any hashtables or lists.
 616          */
 617         error = xfs_qm_dqread(mp, 0,
 618                         XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 619                          (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 620                           XFS_DQ_PROJ),
 621                         XFS_QMOPT_DOWARN, &dqp);
 622         if (!error) {
 623                 xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 624
 625                 /*
 626                  * The warnings and timers set the grace period given to
 627                  * a user or group before he or she can not perform any
 628                  * more writing. If it is zero, a default is used.
 629                  */
 630                 qinf->qi_btimelimit = ddqp->d_btimer ?
 631                         be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 632                 qinf->qi_itimelimit = ddqp->d_itimer ?
 633                         be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 634                 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 635                         be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 636                 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 637                         be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 638                 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 639                         be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 640                 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 641                         be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 642                 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 643                 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 644                 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 645                 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 646                 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 647                 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 648
 649                 xfs_qm_dqdestroy(dqp);
 650         } else {
 651                 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 652                 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 653                 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 654                 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 655                 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 656                 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 657         }
 658
 659         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 660         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 661         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 662         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 663         register_shrinker(&qinf->qi_shrinker);
 664         return 0;
 665
 666 out_free_lru:
 667         list_lru_destroy(&qinf->qi_lru);
 668 out_free_qinf:
 669         kmem_free(qinf);
 670         mp->m_quotainfo = NULL;
 671         return error;
 672 }
 673
 674
 675 /*
 676  * Gets called when unmounting a filesystem or when all quotas get
 677  * turned off.
 678  * This purges the quota inodes, destroys locks and frees itself.
 679  */
 680 void
 681 xfs_qm_destroy_quotainfo(
 682         xfs_mount_t     *mp)
 683 {
 684         xfs_quotainfo_t *qi;
 685
 686         qi = mp->m_quotainfo;
 687         ASSERT(qi != NULL);
 688
 689         unregister_shrinker(&qi->qi_shrinker);
 690         list_lru_destroy(&qi->qi_lru);
 691
 692         if (qi->qi_uquotaip) {
 693                 IRELE(qi->qi_uquotaip);
 694                 qi->qi_uquotaip = NULL; /* paranoia */
 695         }
 696         if (qi->qi_gquotaip) {
 697                 IRELE(qi->qi_gquotaip);
 698                 qi->qi_gquotaip = NULL;
 699         }
 700         if (qi->qi_pquotaip) {
 701                 IRELE(qi->qi_pquotaip);
 702                 qi->qi_pquotaip = NULL;
 703         }
 704         mutex_destroy(&qi->qi_quotaofflock);
 705         kmem_free(qi);
 706         mp->m_quotainfo = NULL;
 707 }
 708
 709 /*
 710  * Create an inode and return with a reference already taken, but unlocked
 711  * This is how we create quota inodes
 712  */
 713 STATIC int
 714 xfs_qm_qino_alloc(
 715         xfs_mount_t     *mp,
 716         xfs_inode_t     **ip,
 717         __int64_t       sbfields,
 718         uint            flags)
 719 {
 720         xfs_trans_t     *tp;
 721         int             error;
 722         int             committed;
 723
 724         *ip = NULL;
 725         /*
 726          * With superblock that doesn't have separate pquotino, we
 727          * share an inode between gquota and pquota. If the on-disk
 728          * superblock has GQUOTA and the filesystem is now mounted
 729          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 730          * vice-versa.
 731          */
 732         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 733                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 734                 xfs_ino_t ino = NULLFSINO;
 735
 736                 if ((flags & XFS_QMOPT_PQUOTA) &&
 737                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 738                         ino = mp->m_sb.sb_gquotino;
 739                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 740                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 741                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 742                         ino = mp->m_sb.sb_pquotino;
 743                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 744                 }
 745                 if (ino != NULLFSINO) {
 746                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 747                         if (error)
 748                                 return error;
 749                         mp->m_sb.sb_gquotino = NULLFSINO;
 750                         mp->m_sb.sb_pquotino = NULLFSINO;
 751                 }
 752         }
 753
 754         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 755         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 756                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 757         if (error) {
 758                 xfs_trans_cancel(tp, 0);
 759                 return error;
 760         }
 761
 762         if (!*ip) {
 763                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 764                                                                 &committed);
 765                 if (error) {
 766                         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 767                                          XFS_TRANS_ABORT);
 768                         return error;
 769                 }
 770         }
 771
 772         /*
 773          * Make the changes in the superblock, and log those too.
 774          * sbfields arg may contain fields other than *QUOTINO;
 775          * VERSIONNUM for example.
 776          */
 777         spin_lock(&mp->m_sb_lock);
 778         if (flags & XFS_QMOPT_SBVERSION) {
 779                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 780                 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 781                         XFS_SB_GQUOTINO | XFS_SB_PQUOTINO | XFS_SB_QFLAGS)) ==
 782                                 (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 783                                  XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
 784                                  XFS_SB_QFLAGS));
 785
 786                 xfs_sb_version_addquota(&mp->m_sb);
 787                 mp->m_sb.sb_uquotino = NULLFSINO;
 788                 mp->m_sb.sb_gquotino = NULLFSINO;
 789                 mp->m_sb.sb_pquotino = NULLFSINO;
 790
 791                 /* qflags will get updated fully _after_ quotacheck */
 792                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 793         }
 794         if (flags & XFS_QMOPT_UQUOTA)
 795                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 796         else if (flags & XFS_QMOPT_GQUOTA)
 797                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 798         else
 799                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 800         spin_unlock(&mp->m_sb_lock);
 801         xfs_mod_sb(tp, sbfields);
 802
 803         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 804                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 805                 return error;
 806         }
 807         return 0;
 808 }
 809
 810
 811 STATIC void
 812 xfs_qm_reset_dqcounts(
 813         xfs_mount_t     *mp,
 814         xfs_buf_t       *bp,
 815         xfs_dqid_t      id,
 816         uint            type)
 817 {
 818         struct xfs_dqblk        *dqb;
 819         int                     j;
 820
 821         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 822
 823         /*
 824          * Reset all counters and timers. They'll be
 825          * started afresh by xfs_qm_quotacheck.
 826          */
 827 #ifdef DEBUG
 828         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 829         do_div(j, sizeof(xfs_dqblk_t));
 830         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 831 #endif
 832         dqb = bp->b_addr;
 833         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 834                 struct xfs_disk_dquot   *ddq;
 835
 836                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 837
 838                 /*
 839                  * Do a sanity check, and if needed, repair the dqblk. Don't
 840                  * output any warnings because it's perfectly possible to
 841                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 842                  */
 843                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 844                             "xfs_quotacheck");
 845                 ddq->d_bcount = 0;
 846                 ddq->d_icount = 0;
 847                 ddq->d_rtbcount = 0;
 848                 ddq->d_btimer = 0;
 849                 ddq->d_itimer = 0;
 850                 ddq->d_rtbtimer = 0;
 851                 ddq->d_bwarns = 0;
 852                 ddq->d_iwarns = 0;
 853                 ddq->d_rtbwarns = 0;
 854
 855                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 856                         xfs_update_cksum((char *)&dqb[j],
 857                                          sizeof(struct xfs_dqblk),
 858                                          XFS_DQUOT_CRC_OFF);
 859                 }
 860         }
 861 }
 862
 863 STATIC int
 864 xfs_qm_dqiter_bufs(
 865         struct xfs_mount        *mp,
 866         xfs_dqid_t              firstid,
 867         xfs_fsblock_t           bno,
 868         xfs_filblks_t           blkcnt,
 869         uint                    flags,
 870         struct list_head        *buffer_list)
 871 {
 872         struct xfs_buf          *bp;
 873         int                     error;
 874         int                     type;
 875
 876         ASSERT(blkcnt > 0);
 877         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 878                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 879         error = 0;
 880
 881         /*
 882          * Blkcnt arg can be a very big number, and might even be
 883          * larger than the log itself. So, we have to break it up into
 884          * manageable-sized transactions.
 885          * Note that we don't start a permanent transaction here; we might
 886          * not be able to get a log reservation for the whole thing up front,
 887          * and we don't really care to either, because we just discard
 888          * everything if we were to crash in the middle of this loop.
 889          */
 890         while (blkcnt--) {
 891                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 892                               XFS_FSB_TO_DADDR(mp, bno),
 893                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 894                               &xfs_dquot_buf_ops);
 895
 896                 /*
 897                  * CRC and validation errors will return a EFSCORRUPTED here. If
 898                  * this occurs, re-read without CRC validation so that we can
 899                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 900                  * will leave a trace in the log indicating corruption has
 901                  * been detected.
 902                  */
 903                 if (error == -EFSCORRUPTED) {
 904                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 905                                       XFS_FSB_TO_DADDR(mp, bno),
 906                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 907                                       NULL);
 908                 }
 909
 910                 if (error)
 911                         break;
 912
 913                 /*
 914                  * A corrupt buffer might not have a verifier attached, so
 915                  * make sure we have the correct one attached before writeback
 916                  * occurs.
 917                  */
 918                 bp->b_ops = &xfs_dquot_buf_ops;
 919                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 920                 xfs_buf_delwri_queue(bp, buffer_list);
 921                 xfs_buf_relse(bp);
 922
 923                 /* goto the next block. */
 924                 bno++;
 925                 firstid += mp->m_quotainfo->qi_dqperchunk;
 926         }
 927
 928         return error;
 929 }
 930
 931 /*
 932  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 933  * caller supplied function for every chunk of dquots that we find.
 934  */
 935 STATIC int
 936 xfs_qm_dqiterate(
 937         struct xfs_mount        *mp,
 938         struct xfs_inode        *qip,
 939         uint                    flags,
 940         struct list_head        *buffer_list)
 941 {
 942         struct xfs_bmbt_irec    *map;
 943         int                     i, nmaps;       /* number of map entries */
 944         int                     error;          /* return value */
 945         xfs_fileoff_t           lblkno;
 946         xfs_filblks_t           maxlblkcnt;
 947         xfs_dqid_t              firstid;
 948         xfs_fsblock_t           rablkno;
 949         xfs_filblks_t           rablkcnt;
 950
 951         error = 0;
 952         /*
 953          * This looks racy, but we can't keep an inode lock across a
 954          * trans_reserve. But, this gets called during quotacheck, and that
 955          * happens only at mount time which is single threaded.
 956          */
 957         if (qip->i_d.di_nblocks == 0)
 958                 return 0;
 959
 960         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 961
 962         lblkno = 0;
 963         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 964         do {
 965                 uint            lock_mode;
 966
 967                 nmaps = XFS_DQITER_MAP_SIZE;
 968                 /*
 969                  * We aren't changing the inode itself. Just changing
 970                  * some of its data. No new blocks are added here, and
 971                  * the inode is never added to the transaction.
 972                  */
 973                 lock_mode = xfs_ilock_data_map_shared(qip);
 974                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 975                                        map, &nmaps, 0);
 976                 xfs_iunlock(qip, lock_mode);
 977                 if (error)
 978                         break;
 979
 980                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 981                 for (i = 0; i < nmaps; i++) {
 982                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 983                         ASSERT(map[i].br_blockcount);
 984
 985
 986                         lblkno += map[i].br_blockcount;
 987
 988                         if (map[i].br_startblock == HOLESTARTBLOCK)
 989                                 continue;
 990
 991                         firstid = (xfs_dqid_t) map[i].br_startoff *
 992                                 mp->m_quotainfo->qi_dqperchunk;
 993                         /*
 994                          * Do a read-ahead on the next extent.
 995                          */
 996                         if ((i+1 < nmaps) &&
 997                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 998                                 rablkcnt =  map[i+1].br_blockcount;
 999                                 rablkno = map[i+1].br_startblock;
1000                                 while (rablkcnt--) {
1001                                         xfs_buf_readahead(mp->m_ddev_targp,
1002                                                XFS_FSB_TO_DADDR(mp, rablkno),
1003                                                mp->m_quotainfo->qi_dqchunklen,
1004                                                &xfs_dquot_buf_ops);
1005                                         rablkno++;
1006                                 }
1007                         }
1008                         /*
1009                          * Iterate thru all the blks in the extent and
1010                          * reset the counters of all the dquots inside them.
1011                          */
1012                         error = xfs_qm_dqiter_bufs(mp, firstid,
1013                                                    map[i].br_startblock,
1014                                                    map[i].br_blockcount,
1015                                                    flags, buffer_list);
1016                         if (error)
1017                                 goto out;
1018                 }
1019         } while (nmaps > 0);
1020
1021 out:
1022         kmem_free(map);
1023         return error;
1024 }
1025
1026 /*
1027  * Called by dqusage_adjust in doing a quotacheck.
1028  *
1029  * Given the inode, and a dquot id this updates both the incore dqout as well
1030  * as the buffer copy. This is so that once the quotacheck is done, we can
1031  * just log all the buffers, as opposed to logging numerous updates to
1032  * individual dquots.
1033  */
1034 STATIC int
1035 xfs_qm_quotacheck_dqadjust(
1036         struct xfs_inode        *ip,
1037         xfs_dqid_t              id,
1038         uint                    type,
1039         xfs_qcnt_t              nblks,
1040         xfs_qcnt_t              rtblks)
1041 {
1042         struct xfs_mount        *mp = ip->i_mount;
1043         struct xfs_dquot        *dqp;
1044         int                     error;
1045
1046         error = xfs_qm_dqget(mp, ip, id, type,
1047                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1048         if (error) {
1049                 /*
1050                  * Shouldn't be able to turn off quotas here.
1051                  */
1052                 ASSERT(error != -ESRCH);
1053                 ASSERT(error != -ENOENT);
1054                 return error;
1055         }
1056
1057         trace_xfs_dqadjust(dqp);
1058
1059         /*
1060          * Adjust the inode count and the block count to reflect this inode's
1061          * resource usage.
1062          */
1063         be64_add_cpu(&dqp->q_core.d_icount, 1);
1064         dqp->q_res_icount++;
1065         if (nblks) {
1066                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1067                 dqp->q_res_bcount += nblks;
1068         }
1069         if (rtblks) {
1070                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1071                 dqp->q_res_rtbcount += rtblks;
1072         }
1073
1074         /*
1075          * Set default limits, adjust timers (since we changed usages)
1076          *
1077          * There are no timers for the default values set in the root dquot.
1078          */
1079         if (dqp->q_core.d_id) {
1080                 xfs_qm_adjust_dqlimits(mp, dqp);
1081                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1082         }
1083
1084         dqp->dq_flags |= XFS_DQ_DIRTY;
1085         xfs_qm_dqput(dqp);
1086         return 0;
1087 }
1088
1089 STATIC int
1090 xfs_qm_get_rtblks(
1091         xfs_inode_t     *ip,
1092         xfs_qcnt_t      *O_rtblks)
1093 {
1094         xfs_filblks_t   rtblks;                 /* total rt blks */
1095         xfs_extnum_t    idx;                    /* extent record index */
1096         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1097         xfs_extnum_t    nextents;               /* number of extent entries */
1098         int             error;
1099
1100         ASSERT(XFS_IS_REALTIME_INODE(ip));
1101         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1102         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1103                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1104                         return error;
1105         }
1106         rtblks = 0;
1107         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1108         for (idx = 0; idx < nextents; idx++)
1109                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1110         *O_rtblks = (xfs_qcnt_t)rtblks;
1111         return 0;
1112 }
1113
1114 /*
1115  * callback routine supplied to bulkstat(). Given an inumber, find its
1116  * dquots and update them to account for resources taken by that inode.
1117  */
1118 /* ARGSUSED */
1119 STATIC int
1120 xfs_qm_dqusage_adjust(
1121         xfs_mount_t     *mp,            /* mount point for filesystem */
1122         xfs_ino_t       ino,            /* inode number to get data for */
1123         void            __user *buffer, /* not used */
1124         int             ubsize,         /* not used */
1125         int             *ubused,        /* not used */
1126         int             *res)           /* result code value */
1127 {
1128         xfs_inode_t     *ip;
1129         xfs_qcnt_t      nblks, rtblks = 0;
1130         int             error;
1131
1132         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1133
1134         /*
1135          * rootino must have its resources accounted for, not so with the quota
1136          * inodes.
1137          */
1138         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1139                 *res = BULKSTAT_RV_NOTHING;
1140                 return -EINVAL;
1141         }
1142
1143         /*
1144          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1145          * interface expects the inode to be exclusively locked because that's
1146          * the case in all other instances. It's OK that we do this because
1147          * quotacheck is done only at mount time.
1148          */
1149         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1150         if (error) {
1151                 *res = BULKSTAT_RV_NOTHING;
1152                 return error;
1153         }
1154
1155         ASSERT(ip->i_delayed_blks == 0);
1156
1157         if (XFS_IS_REALTIME_INODE(ip)) {
1158                 /*
1159                  * Walk thru the extent list and count the realtime blocks.
1160                  */
1161                 error = xfs_qm_get_rtblks(ip, &rtblks);
1162                 if (error)
1163                         goto error0;
1164         }
1165
1166         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1167
1168         /*
1169          * Add the (disk blocks and inode) resources occupied by this
1170          * inode to its dquots. We do this adjustment in the incore dquot,
1171          * and also copy the changes to its buffer.
1172          * We don't care about putting these changes in a transaction
1173          * envelope because if we crash in the middle of a 'quotacheck'
1174          * we have to start from the beginning anyway.
1175          * Once we're done, we'll log all the dquot bufs.
1176          *
1177          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1178          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1179          */
1180         if (XFS_IS_UQUOTA_ON(mp)) {
1181                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1182                                                    XFS_DQ_USER, nblks, rtblks);
1183                 if (error)
1184                         goto error0;
1185         }
1186
1187         if (XFS_IS_GQUOTA_ON(mp)) {
1188                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1189                                                    XFS_DQ_GROUP, nblks, rtblks);
1190                 if (error)
1191                         goto error0;
1192         }
1193
1194         if (XFS_IS_PQUOTA_ON(mp)) {
1195                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1196                                                    XFS_DQ_PROJ, nblks, rtblks);
1197                 if (error)
1198                         goto error0;
1199         }
1200
1201         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1202         IRELE(ip);
1203         *res = BULKSTAT_RV_DIDONE;
1204         return 0;
1205
1206 error0:
1207         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1208         IRELE(ip);
1209         *res = BULKSTAT_RV_GIVEUP;
1210         return error;
1211 }
1212
1213 STATIC int
1214 xfs_qm_flush_one(
1215         struct xfs_dquot        *dqp,
1216         void                    *data)
1217 {
1218         struct list_head        *buffer_list = data;
1219         struct xfs_buf          *bp = NULL;
1220         int                     error = 0;
1221
1222         xfs_dqlock(dqp);
1223         if (dqp->dq_flags & XFS_DQ_FREEING)
1224                 goto out_unlock;
1225         if (!XFS_DQ_IS_DIRTY(dqp))
1226                 goto out_unlock;
1227
1228         xfs_dqflock(dqp);
1229         error = xfs_qm_dqflush(dqp, &bp);
1230         if (error)
1231                 goto out_unlock;
1232
1233         xfs_buf_delwri_queue(bp, buffer_list);
1234         xfs_buf_relse(bp);
1235 out_unlock:
1236         xfs_dqunlock(dqp);
1237         return error;
1238 }
1239
1240 /*
1241  * Walk thru all the filesystem inodes and construct a consistent view
1242  * of the disk quota world. If the quotacheck fails, disable quotas.
1243  */
1244 STATIC int
1245 xfs_qm_quotacheck(
1246         xfs_mount_t     *mp)
1247 {
1248         int                     done, count, error, error2;
1249         xfs_ino_t               lastino;
1250         size_t                  structsz;
1251         uint                    flags;
1252         LIST_HEAD               (buffer_list);
1253         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1254         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1255         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1256
1257         count = INT_MAX;
1258         structsz = 1;
1259         lastino = 0;
1260         flags = 0;
1261
1262         ASSERT(uip || gip || pip);
1263         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1264
1265         xfs_notice(mp, "Quotacheck needed: Please wait.");
1266
1267         /*
1268          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1269          * their counters to zero. We need a clean slate.
1270          * We don't log our changes till later.
1271          */
1272         if (uip) {
1273                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1274                                          &buffer_list);
1275                 if (error)
1276                         goto error_return;
1277                 flags |= XFS_UQUOTA_CHKD;
1278         }
1279
1280         if (gip) {
1281                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1282                                          &buffer_list);
1283                 if (error)
1284                         goto error_return;
1285                 flags |= XFS_GQUOTA_CHKD;
1286         }
1287
1288         if (pip) {
1289                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1290                                          &buffer_list);
1291                 if (error)
1292                         goto error_return;
1293                 flags |= XFS_PQUOTA_CHKD;
1294         }
1295
1296         do {
1297                 /*
1298                  * Iterate thru all the inodes in the file system,
1299                  * adjusting the corresponding dquot counters in core.
1300                  */
1301                 error = xfs_bulkstat(mp, &lastino, &count,
1302                                      xfs_qm_dqusage_adjust,
1303                                      structsz, NULL, &done);
1304                 if (error)
1305                         break;
1306
1307         } while (!done);
1308
1309         /*
1310          * We've made all the changes that we need to make incore.  Flush them
1311          * down to disk buffers if everything was updated successfully.
1312          */
1313         if (XFS_IS_UQUOTA_ON(mp)) {
1314                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1315                                           &buffer_list);
1316         }
1317         if (XFS_IS_GQUOTA_ON(mp)) {
1318                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1319                                            &buffer_list);
1320                 if (!error)
1321                         error = error2;
1322         }
1323         if (XFS_IS_PQUOTA_ON(mp)) {
1324                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1325                                            &buffer_list);
1326                 if (!error)
1327                         error = error2;
1328         }
1329
1330         error2 = xfs_buf_delwri_submit(&buffer_list);
1331         if (!error)
1332                 error = error2;
1333
1334         /*
1335          * We can get this error if we couldn't do a dquot allocation inside
1336          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1337          * dirty dquots that might be cached, we just want to get rid of them
1338          * and turn quotaoff. The dquots won't be attached to any of the inodes
1339          * at this point (because we intentionally didn't in dqget_noattach).
1340          */
1341         if (error) {
1342                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1343                 goto error_return;
1344         }
1345
1346         /*
1347          * If one type of quotas is off, then it will lose its
1348          * quotachecked status, since we won't be doing accounting for
1349          * that type anymore.
1350          */
1351         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1352         mp->m_qflags |= flags;
1353
1354  error_return:
1355         while (!list_empty(&buffer_list)) {
1356                 struct xfs_buf *bp =
1357                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1358                 list_del_init(&bp->b_list);
1359                 xfs_buf_relse(bp);
1360         }
1361
1362         if (error) {
1363                 xfs_warn(mp,
1364         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1365                         error);
1366                 /*
1367                  * We must turn off quotas.
1368                  */
1369                 ASSERT(mp->m_quotainfo != NULL);
1370                 xfs_qm_destroy_quotainfo(mp);
1371                 if (xfs_mount_reset_sbqflags(mp)) {
1372                         xfs_warn(mp,
1373                                 "Quotacheck: Failed to reset quota flags.");
1374                 }
1375         } else
1376                 xfs_notice(mp, "Quotacheck: Done.");
1377         return error;
1378 }
1379
1380 /*
1381  * This is called from xfs_mountfs to start quotas and initialize all
1382  * necessary data structures like quotainfo.  This is also responsible for
1383  * running a quotacheck as necessary.  We are guaranteed that the superblock
1384  * is consistently read in at this point.
1385  *
1386  * If we fail here, the mount will continue with quota turned off. We don't
1387  * need to inidicate success or failure at all.
1388  */
1389 void
1390 xfs_qm_mount_quotas(
1391         struct xfs_mount        *mp)
1392 {
1393         int                     error = 0;
1394         uint                    sbf;
1395
1396         /*
1397          * If quotas on realtime volumes is not supported, we disable
1398          * quotas immediately.
1399          */
1400         if (mp->m_sb.sb_rextents) {
1401                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1402                 mp->m_qflags = 0;
1403                 goto write_changes;
1404         }
1405
1406         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1407
1408         /*
1409          * Allocate the quotainfo structure inside the mount struct, and
1410          * create quotainode(s), and change/rev superblock if necessary.
1411          */
1412         error = xfs_qm_init_quotainfo(mp);
1413         if (error) {
1414                 /*
1415                  * We must turn off quotas.
1416                  */
1417                 ASSERT(mp->m_quotainfo == NULL);
1418                 mp->m_qflags = 0;
1419                 goto write_changes;
1420         }
1421         /*
1422          * If any of the quotas are not consistent, do a quotacheck.
1423          */
1424         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1425                 error = xfs_qm_quotacheck(mp);
1426                 if (error) {
1427                         /* Quotacheck failed and disabled quotas. */
1428                         return;
1429                 }
1430         }
1431         /*
1432          * If one type of quotas is off, then it will lose its
1433          * quotachecked status, since we won't be doing accounting for
1434          * that type anymore.
1435          */
1436         if (!XFS_IS_UQUOTA_ON(mp))
1437                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1438         if (!XFS_IS_GQUOTA_ON(mp))
1439                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1440         if (!XFS_IS_PQUOTA_ON(mp))
1441                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1442
1443  write_changes:
1444         /*
1445          * We actually don't have to acquire the m_sb_lock at all.
1446          * This can only be called from mount, and that's single threaded. XXX
1447          */
1448         spin_lock(&mp->m_sb_lock);
1449         sbf = mp->m_sb.sb_qflags;
1450         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1451         spin_unlock(&mp->m_sb_lock);
1452
1453         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1454                 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
1455                         /*
1456                          * We could only have been turning quotas off.
1457                          * We aren't in very good shape actually because
1458                          * the incore structures are convinced that quotas are
1459                          * off, but the on disk superblock doesn't know that !
1460                          */
1461                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1462                         xfs_alert(mp, "%s: Superblock update failed!",
1463                                 __func__);
1464                 }
1465         }
1466
1467         if (error) {
1468                 xfs_warn(mp, "Failed to initialize disk quotas.");
1469                 return;
1470         }
1471 }
1472
1473 /*
1474  * This is called after the superblock has been read in and we're ready to
1475  * iget the quota inodes.
1476  */
1477 STATIC int
1478 xfs_qm_init_quotainos(
1479         xfs_mount_t     *mp)
1480 {
1481         struct xfs_inode        *uip = NULL;
1482         struct xfs_inode        *gip = NULL;
1483         struct xfs_inode        *pip = NULL;
1484         int                     error;
1485         __int64_t               sbflags = 0;
1486         uint                    flags = 0;
1487
1488         ASSERT(mp->m_quotainfo);
1489
1490         /*
1491          * Get the uquota and gquota inodes
1492          */
1493         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1494                 if (XFS_IS_UQUOTA_ON(mp) &&
1495                     mp->m_sb.sb_uquotino != NULLFSINO) {
1496                         ASSERT(mp->m_sb.sb_uquotino > 0);
1497                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1498                                              0, 0, &uip);
1499                         if (error)
1500                                 return error;
1501                 }
1502                 if (XFS_IS_GQUOTA_ON(mp) &&
1503                     mp->m_sb.sb_gquotino != NULLFSINO) {
1504                         ASSERT(mp->m_sb.sb_gquotino > 0);
1505                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1506                                              0, 0, &gip);
1507                         if (error)
1508                                 goto error_rele;
1509                 }
1510                 if (XFS_IS_PQUOTA_ON(mp) &&
1511                     mp->m_sb.sb_pquotino != NULLFSINO) {
1512                         ASSERT(mp->m_sb.sb_pquotino > 0);
1513                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1514                                              0, 0, &pip);
1515                         if (error)
1516                                 goto error_rele;
1517                 }
1518         } else {
1519                 flags |= XFS_QMOPT_SBVERSION;
1520                 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1521                             XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
1522                             XFS_SB_QFLAGS);
1523         }
1524
1525         /*
1526          * Create the three inodes, if they don't exist already. The changes
1527          * made above will get added to a transaction and logged in one of
1528          * the qino_alloc calls below.  If the device is readonly,
1529          * temporarily switch to read-write to do this.
1530          */
1531         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1532                 error = xfs_qm_qino_alloc(mp, &uip,
1533                                               sbflags | XFS_SB_UQUOTINO,
1534                                               flags | XFS_QMOPT_UQUOTA);
1535                 if (error)
1536                         goto error_rele;
1537
1538                 flags &= ~XFS_QMOPT_SBVERSION;
1539         }
1540         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1541                 error = xfs_qm_qino_alloc(mp, &gip,
1542                                           sbflags | XFS_SB_GQUOTINO,
1543                                           flags | XFS_QMOPT_GQUOTA);
1544                 if (error)
1545                         goto error_rele;
1546
1547                 flags &= ~XFS_QMOPT_SBVERSION;
1548         }
1549         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1550                 error = xfs_qm_qino_alloc(mp, &pip,
1551                                           sbflags | XFS_SB_PQUOTINO,
1552                                           flags | XFS_QMOPT_PQUOTA);
1553                 if (error)
1554                         goto error_rele;
1555         }
1556
1557         mp->m_quotainfo->qi_uquotaip = uip;
1558         mp->m_quotainfo->qi_gquotaip = gip;
1559         mp->m_quotainfo->qi_pquotaip = pip;
1560
1561         return 0;
1562
1563 error_rele:
1564         if (uip)
1565                 IRELE(uip);
1566         if (gip)
1567                 IRELE(gip);
1568         if (pip)
1569                 IRELE(pip);
1570         return error;
1571 }
1572
1573 STATIC void
1574 xfs_qm_dqfree_one(
1575         struct xfs_dquot        *dqp)
1576 {
1577         struct xfs_mount        *mp = dqp->q_mount;
1578         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1579
1580         mutex_lock(&qi->qi_tree_lock);
1581         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1582                           be32_to_cpu(dqp->q_core.d_id));
1583
1584         qi->qi_dquots--;
1585         mutex_unlock(&qi->qi_tree_lock);
1586
1587         xfs_qm_dqdestroy(dqp);
1588 }
1589
1590 /*
1591  * Start a transaction and write the incore superblock changes to
1592  * disk. flags parameter indicates which fields have changed.
1593  */
1594 int
1595 xfs_qm_write_sb_changes(
1596         xfs_mount_t     *mp,
1597         __int64_t       flags)
1598 {
1599         xfs_trans_t     *tp;
1600         int             error;
1601
1602         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1603         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_sbchange, 0, 0);
1604         if (error) {
1605                 xfs_trans_cancel(tp, 0);
1606                 return error;
1607         }
1608
1609         xfs_mod_sb(tp, flags);
1610         error = xfs_trans_commit(tp, 0);
1611
1612         return error;
1613 }
1614
1615
1616 /* --------------- utility functions for vnodeops ---------------- */
1617
1618
1619 /*
1620  * Given an inode, a uid, gid and prid make sure that we have
1621  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1622  * quotas by creating this file.
1623  * This also attaches dquot(s) to the given inode after locking it,
1624  * and returns the dquots corresponding to the uid and/or gid.
1625  *
1626  * in   : inode (unlocked)
1627  * out  : udquot, gdquot with references taken and unlocked
1628  */
1629 int
1630 xfs_qm_vop_dqalloc(
1631         struct xfs_inode        *ip,
1632         xfs_dqid_t              uid,
1633         xfs_dqid_t              gid,
1634         prid_t                  prid,
1635         uint                    flags,
1636         struct xfs_dquot        **O_udqpp,
1637         struct xfs_dquot        **O_gdqpp,
1638         struct xfs_dquot        **O_pdqpp)
1639 {
1640         struct xfs_mount        *mp = ip->i_mount;
1641         struct xfs_dquot        *uq = NULL;
1642         struct xfs_dquot        *gq = NULL;
1643         struct xfs_dquot        *pq = NULL;
1644         int                     error;
1645         uint                    lockflags;
1646
1647         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1648                 return 0;
1649
1650         lockflags = XFS_ILOCK_EXCL;
1651         xfs_ilock(ip, lockflags);
1652
1653         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1654                 gid = ip->i_d.di_gid;
1655
1656         /*
1657          * Attach the dquot(s) to this inode, doing a dquot allocation
1658          * if necessary. The dquot(s) will not be locked.
1659          */
1660         if (XFS_NOT_DQATTACHED(mp, ip)) {
1661                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1662                 if (error) {
1663                         xfs_iunlock(ip, lockflags);
1664                         return error;
1665                 }
1666         }
1667
1668         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1669                 if (ip->i_d.di_uid != uid) {
1670                         /*
1671                          * What we need is the dquot that has this uid, and
1672                          * if we send the inode to dqget, the uid of the inode
1673                          * takes priority over what's sent in the uid argument.
1674                          * We must unlock inode here before calling dqget if
1675                          * we're not sending the inode, because otherwise
1676                          * we'll deadlock by doing trans_reserve while
1677                          * holding ilock.
1678                          */
1679                         xfs_iunlock(ip, lockflags);
1680                         error = xfs_qm_dqget(mp, NULL, uid,
1681                                                  XFS_DQ_USER,
1682                                                  XFS_QMOPT_DQALLOC |
1683                                                  XFS_QMOPT_DOWARN,
1684                                                  &uq);
1685                         if (error) {
1686                                 ASSERT(error != -ENOENT);
1687                                 return error;
1688                         }
1689                         /*
1690                          * Get the ilock in the right order.
1691                          */
1692                         xfs_dqunlock(uq);
1693                         lockflags = XFS_ILOCK_SHARED;
1694                         xfs_ilock(ip, lockflags);
1695                 } else {
1696                         /*
1697                          * Take an extra reference, because we'll return
1698                          * this to caller
1699                          */
1700                         ASSERT(ip->i_udquot);
1701                         uq = xfs_qm_dqhold(ip->i_udquot);
1702                 }
1703         }
1704         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1705                 if (ip->i_d.di_gid != gid) {
1706                         xfs_iunlock(ip, lockflags);
1707                         error = xfs_qm_dqget(mp, NULL, gid,
1708                                                  XFS_DQ_GROUP,
1709                                                  XFS_QMOPT_DQALLOC |
1710                                                  XFS_QMOPT_DOWARN,
1711                                                  &gq);
1712                         if (error) {
1713                                 ASSERT(error != -ENOENT);
1714                                 goto error_rele;
1715                         }
1716                         xfs_dqunlock(gq);
1717                         lockflags = XFS_ILOCK_SHARED;
1718                         xfs_ilock(ip, lockflags);
1719                 } else {
1720                         ASSERT(ip->i_gdquot);
1721                         gq = xfs_qm_dqhold(ip->i_gdquot);
1722                 }
1723         }
1724         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1725                 if (xfs_get_projid(ip) != prid) {
1726                         xfs_iunlock(ip, lockflags);
1727                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1728                                                  XFS_DQ_PROJ,
1729                                                  XFS_QMOPT_DQALLOC |
1730                                                  XFS_QMOPT_DOWARN,
1731                                                  &pq);
1732                         if (error) {
1733                                 ASSERT(error != -ENOENT);
1734                                 goto error_rele;
1735                         }
1736                         xfs_dqunlock(pq);
1737                         lockflags = XFS_ILOCK_SHARED;
1738                         xfs_ilock(ip, lockflags);
1739                 } else {
1740                         ASSERT(ip->i_pdquot);
1741                         pq = xfs_qm_dqhold(ip->i_pdquot);
1742                 }
1743         }
1744         if (uq)
1745                 trace_xfs_dquot_dqalloc(ip);
1746
1747         xfs_iunlock(ip, lockflags);
1748         if (O_udqpp)
1749                 *O_udqpp = uq;
1750         else
1751                 xfs_qm_dqrele(uq);
1752         if (O_gdqpp)
1753                 *O_gdqpp = gq;
1754         else
1755                 xfs_qm_dqrele(gq);
1756         if (O_pdqpp)
1757                 *O_pdqpp = pq;
1758         else
1759                 xfs_qm_dqrele(pq);
1760         return 0;
1761
1762 error_rele:
1763         xfs_qm_dqrele(gq);
1764         xfs_qm_dqrele(uq);
1765         return error;
1766 }
1767
1768 /*
1769  * Actually transfer ownership, and do dquot modifications.
1770  * These were already reserved.
1771  */
1772 xfs_dquot_t *
1773 xfs_qm_vop_chown(
1774         xfs_trans_t     *tp,
1775         xfs_inode_t     *ip,
1776         xfs_dquot_t     **IO_olddq,
1777         xfs_dquot_t     *newdq)
1778 {
1779         xfs_dquot_t     *prevdq;
1780         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1781                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1782
1783
1784         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1785         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1786
1787         /* old dquot */
1788         prevdq = *IO_olddq;
1789         ASSERT(prevdq);
1790         ASSERT(prevdq != newdq);
1791
1792         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1793         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1794
1795         /* the sparkling new dquot */
1796         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1797         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1798
1799         /*
1800          * Take an extra reference, because the inode is going to keep
1801          * this dquot pointer even after the trans_commit.
1802          */
1803         *IO_olddq = xfs_qm_dqhold(newdq);
1804
1805         return prevdq;
1806 }
1807
1808 /*
1809  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1810  */
1811 int
1812 xfs_qm_vop_chown_reserve(
1813         struct xfs_trans        *tp,
1814         struct xfs_inode        *ip,
1815         struct xfs_dquot        *udqp,
1816         struct xfs_dquot        *gdqp,
1817         struct xfs_dquot        *pdqp,
1818         uint                    flags)
1819 {
1820         struct xfs_mount        *mp = ip->i_mount;
1821         uint                    delblks, blkflags, prjflags = 0;
1822         struct xfs_dquot        *udq_unres = NULL;
1823         struct xfs_dquot        *gdq_unres = NULL;
1824         struct xfs_dquot        *pdq_unres = NULL;
1825         struct xfs_dquot        *udq_delblks = NULL;
1826         struct xfs_dquot        *gdq_delblks = NULL;
1827         struct xfs_dquot        *pdq_delblks = NULL;
1828         int                     error;
1829
1830
1831         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1832         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1833
1834         delblks = ip->i_delayed_blks;
1835         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1836                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1837
1838         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1839             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1840                 udq_delblks = udqp;
1841                 /*
1842                  * If there are delayed allocation blocks, then we have to
1843                  * unreserve those from the old dquot, and add them to the
1844                  * new dquot.
1845                  */
1846                 if (delblks) {
1847                         ASSERT(ip->i_udquot);
1848                         udq_unres = ip->i_udquot;
1849                 }
1850         }
1851         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1852             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1853                 gdq_delblks = gdqp;
1854                 if (delblks) {
1855                         ASSERT(ip->i_gdquot);
1856                         gdq_unres = ip->i_gdquot;
1857                 }
1858         }
1859
1860         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1861             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1862                 prjflags = XFS_QMOPT_ENOSPC;
1863                 pdq_delblks = pdqp;
1864                 if (delblks) {
1865                         ASSERT(ip->i_pdquot);
1866                         pdq_unres = ip->i_pdquot;
1867                 }
1868         }
1869
1870         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1871                                 udq_delblks, gdq_delblks, pdq_delblks,
1872                                 ip->i_d.di_nblocks, 1,
1873                                 flags | blkflags | prjflags);
1874         if (error)
1875                 return error;
1876
1877         /*
1878          * Do the delayed blks reservations/unreservations now. Since, these
1879          * are done without the help of a transaction, if a reservation fails
1880          * its previous reservations won't be automatically undone by trans
1881          * code. So, we have to do it manually here.
1882          */
1883         if (delblks) {
1884                 /*
1885                  * Do the reservations first. Unreservation can't fail.
1886                  */
1887                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1888                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1889                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1890                             udq_delblks, gdq_delblks, pdq_delblks,
1891                             (xfs_qcnt_t)delblks, 0,
1892                             flags | blkflags | prjflags);
1893                 if (error)
1894                         return error;
1895                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1896                                 udq_unres, gdq_unres, pdq_unres,
1897                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1898         }
1899
1900         return 0;
1901 }
1902
1903 int
1904 xfs_qm_vop_rename_dqattach(
1905         struct xfs_inode        **i_tab)
1906 {
1907         struct xfs_mount        *mp = i_tab[0]->i_mount;
1908         int                     i;
1909
1910         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1911                 return 0;
1912
1913         for (i = 0; (i < 4 && i_tab[i]); i++) {
1914                 struct xfs_inode        *ip = i_tab[i];
1915                 int                     error;
1916
1917                 /*
1918                  * Watch out for duplicate entries in the table.
1919                  */
1920                 if (i == 0 || ip != i_tab[i-1]) {
1921                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1922                                 error = xfs_qm_dqattach(ip, 0);
1923                                 if (error)
1924                                         return error;
1925                         }
1926                 }
1927         }
1928         return 0;
1929 }
1930
1931 void
1932 xfs_qm_vop_create_dqattach(
1933         struct xfs_trans        *tp,
1934         struct xfs_inode        *ip,
1935         struct xfs_dquot        *udqp,
1936         struct xfs_dquot        *gdqp,
1937         struct xfs_dquot        *pdqp)
1938 {
1939         struct xfs_mount        *mp = tp->t_mountp;
1940
1941         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1942                 return;
1943
1944         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1945         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1946
1947         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1948                 ASSERT(ip->i_udquot == NULL);
1949                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1950
1951                 ip->i_udquot = xfs_qm_dqhold(udqp);
1952                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1953         }
1954         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1955                 ASSERT(ip->i_gdquot == NULL);
1956                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1957                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1958                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1959         }
1960         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1961                 ASSERT(ip->i_pdquot == NULL);
1962                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1963
1964                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1965                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1966         }
1967 }
1968