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         struct list_lru_one     *lru,
 434         spinlock_t              *lru_lock,
 435         void                    *arg)
 436                 __releases(lru_lock) __acquires(lru_lock)
 437 {
 438         struct xfs_dquot        *dqp = container_of(item,
 439                                                 struct xfs_dquot, q_lru);
 440         struct xfs_qm_isolate   *isol = arg;
 441
 442         if (!xfs_dqlock_nowait(dqp))
 443                 goto out_miss_busy;
 444
 445         /*
 446          * This dquot has acquired a reference in the meantime remove it from
 447          * the freelist and try again.
 448          */
 449         if (dqp->q_nrefs) {
 450                 xfs_dqunlock(dqp);
 451                 XFS_STATS_INC(xs_qm_dqwants);
 452
 453                 trace_xfs_dqreclaim_want(dqp);
 454                 list_lru_isolate(lru, &dqp->q_lru);
 455                 XFS_STATS_DEC(xs_qm_dquot_unused);
 456                 return LRU_REMOVED;
 457         }
 458
 459         /*
 460          * If the dquot is dirty, flush it. If it's already being flushed, just
 461          * skip it so there is time for the IO to complete before we try to
 462          * reclaim it again on the next LRU pass.
 463          */
 464         if (!xfs_dqflock_nowait(dqp)) {
 465                 xfs_dqunlock(dqp);
 466                 goto out_miss_busy;
 467         }
 468
 469         if (XFS_DQ_IS_DIRTY(dqp)) {
 470                 struct xfs_buf  *bp = NULL;
 471                 int             error;
 472
 473                 trace_xfs_dqreclaim_dirty(dqp);
 474
 475                 /* we have to drop the LRU lock to flush the dquot */
 476                 spin_unlock(lru_lock);
 477
 478                 error = xfs_qm_dqflush(dqp, &bp);
 479                 if (error) {
 480                         xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 481                                  __func__, dqp);
 482                         goto out_unlock_dirty;
 483                 }
 484
 485                 xfs_buf_delwri_queue(bp, &isol->buffers);
 486                 xfs_buf_relse(bp);
 487                 goto out_unlock_dirty;
 488         }
 489         xfs_dqfunlock(dqp);
 490
 491         /*
 492          * Prevent lookups now that we are past the point of no return.
 493          */
 494         dqp->dq_flags |= XFS_DQ_FREEING;
 495         xfs_dqunlock(dqp);
 496
 497         ASSERT(dqp->q_nrefs == 0);
 498         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 499         XFS_STATS_DEC(xs_qm_dquot_unused);
 500         trace_xfs_dqreclaim_done(dqp);
 501         XFS_STATS_INC(xs_qm_dqreclaims);
 502         return LRU_REMOVED;
 503
 504 out_miss_busy:
 505         trace_xfs_dqreclaim_busy(dqp);
 506         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 507         return LRU_SKIP;
 508
 509 out_unlock_dirty:
 510         trace_xfs_dqreclaim_busy(dqp);
 511         XFS_STATS_INC(xs_qm_dqreclaim_misses);
 512         xfs_dqunlock(dqp);
 513         spin_lock(lru_lock);
 514         return LRU_RETRY;
 515 }
 516
 517 static unsigned long
 518 xfs_qm_shrink_scan(
 519         struct shrinker         *shrink,
 520         struct shrink_control   *sc)
 521 {
 522         struct xfs_quotainfo    *qi = container_of(shrink,
 523                                         struct xfs_quotainfo, qi_shrinker);
 524         struct xfs_qm_isolate   isol;
 525         unsigned long           freed;
 526         int                     error;
 527
 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_shrink_walk(&qi->qi_lru, sc,
 535                                      xfs_qm_dquot_isolate, &isol);
 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_shrink_count(&qi->qi_lru, sc);
 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         uint            flags)
 718 {
 719         xfs_trans_t     *tp;
 720         int             error;
 721         int             committed;
 722
 723         *ip = NULL;
 724         /*
 725          * With superblock that doesn't have separate pquotino, we
 726          * share an inode between gquota and pquota. If the on-disk
 727          * superblock has GQUOTA and the filesystem is now mounted
 728          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 729          * vice-versa.
 730          */
 731         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 732                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 733                 xfs_ino_t ino = NULLFSINO;
 734
 735                 if ((flags & XFS_QMOPT_PQUOTA) &&
 736                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 737                         ino = mp->m_sb.sb_gquotino;
 738                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 739                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 740                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 741                         ino = mp->m_sb.sb_pquotino;
 742                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 743                 }
 744                 if (ino != NULLFSINO) {
 745                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 746                         if (error)
 747                                 return error;
 748                         mp->m_sb.sb_gquotino = NULLFSINO;
 749                         mp->m_sb.sb_pquotino = NULLFSINO;
 750                 }
 751         }
 752
 753         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 754         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 755                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 756         if (error) {
 757                 xfs_trans_cancel(tp, 0);
 758                 return error;
 759         }
 760
 761         if (!*ip) {
 762                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 763                                                                 &committed);
 764                 if (error) {
 765                         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 766                                          XFS_TRANS_ABORT);
 767                         return error;
 768                 }
 769         }
 770
 771         /*
 772          * Make the changes in the superblock, and log those too.
 773          * sbfields arg may contain fields other than *QUOTINO;
 774          * VERSIONNUM for example.
 775          */
 776         spin_lock(&mp->m_sb_lock);
 777         if (flags & XFS_QMOPT_SBVERSION) {
 778                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 779
 780                 xfs_sb_version_addquota(&mp->m_sb);
 781                 mp->m_sb.sb_uquotino = NULLFSINO;
 782                 mp->m_sb.sb_gquotino = NULLFSINO;
 783                 mp->m_sb.sb_pquotino = NULLFSINO;
 784
 785                 /* qflags will get updated fully _after_ quotacheck */
 786                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 787         }
 788         if (flags & XFS_QMOPT_UQUOTA)
 789                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 790         else if (flags & XFS_QMOPT_GQUOTA)
 791                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 792         else
 793                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 794         spin_unlock(&mp->m_sb_lock);
 795         xfs_log_sb(tp);
 796
 797         if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 798                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 799                 return error;
 800         }
 801         return 0;
 802 }
 803
 804
 805 STATIC void
 806 xfs_qm_reset_dqcounts(
 807         xfs_mount_t     *mp,
 808         xfs_buf_t       *bp,
 809         xfs_dqid_t      id,
 810         uint            type)
 811 {
 812         struct xfs_dqblk        *dqb;
 813         int                     j;
 814
 815         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 816
 817         /*
 818          * Reset all counters and timers. They'll be
 819          * started afresh by xfs_qm_quotacheck.
 820          */
 821 #ifdef DEBUG
 822         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 823         do_div(j, sizeof(xfs_dqblk_t));
 824         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 825 #endif
 826         dqb = bp->b_addr;
 827         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 828                 struct xfs_disk_dquot   *ddq;
 829
 830                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 831
 832                 /*
 833                  * Do a sanity check, and if needed, repair the dqblk. Don't
 834                  * output any warnings because it's perfectly possible to
 835                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 836                  */
 837                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 838                             "xfs_quotacheck");
 839                 ddq->d_bcount = 0;
 840                 ddq->d_icount = 0;
 841                 ddq->d_rtbcount = 0;
 842                 ddq->d_btimer = 0;
 843                 ddq->d_itimer = 0;
 844                 ddq->d_rtbtimer = 0;
 845                 ddq->d_bwarns = 0;
 846                 ddq->d_iwarns = 0;
 847                 ddq->d_rtbwarns = 0;
 848
 849                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 850                         xfs_update_cksum((char *)&dqb[j],
 851                                          sizeof(struct xfs_dqblk),
 852                                          XFS_DQUOT_CRC_OFF);
 853                 }
 854         }
 855 }
 856
 857 STATIC int
 858 xfs_qm_dqiter_bufs(
 859         struct xfs_mount        *mp,
 860         xfs_dqid_t              firstid,
 861         xfs_fsblock_t           bno,
 862         xfs_filblks_t           blkcnt,
 863         uint                    flags,
 864         struct list_head        *buffer_list)
 865 {
 866         struct xfs_buf          *bp;
 867         int                     error;
 868         int                     type;
 869
 870         ASSERT(blkcnt > 0);
 871         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 872                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 873         error = 0;
 874
 875         /*
 876          * Blkcnt arg can be a very big number, and might even be
 877          * larger than the log itself. So, we have to break it up into
 878          * manageable-sized transactions.
 879          * Note that we don't start a permanent transaction here; we might
 880          * not be able to get a log reservation for the whole thing up front,
 881          * and we don't really care to either, because we just discard
 882          * everything if we were to crash in the middle of this loop.
 883          */
 884         while (blkcnt--) {
 885                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 886                               XFS_FSB_TO_DADDR(mp, bno),
 887                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 888                               &xfs_dquot_buf_ops);
 889
 890                 /*
 891                  * CRC and validation errors will return a EFSCORRUPTED here. If
 892                  * this occurs, re-read without CRC validation so that we can
 893                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 894                  * will leave a trace in the log indicating corruption has
 895                  * been detected.
 896                  */
 897                 if (error == -EFSCORRUPTED) {
 898                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 899                                       XFS_FSB_TO_DADDR(mp, bno),
 900                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 901                                       NULL);
 902                 }
 903
 904                 if (error)
 905                         break;
 906
 907                 /*
 908                  * A corrupt buffer might not have a verifier attached, so
 909                  * make sure we have the correct one attached before writeback
 910                  * occurs.
 911                  */
 912                 bp->b_ops = &xfs_dquot_buf_ops;
 913                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 914                 xfs_buf_delwri_queue(bp, buffer_list);
 915                 xfs_buf_relse(bp);
 916
 917                 /* goto the next block. */
 918                 bno++;
 919                 firstid += mp->m_quotainfo->qi_dqperchunk;
 920         }
 921
 922         return error;
 923 }
 924
 925 /*
 926  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 927  * caller supplied function for every chunk of dquots that we find.
 928  */
 929 STATIC int
 930 xfs_qm_dqiterate(
 931         struct xfs_mount        *mp,
 932         struct xfs_inode        *qip,
 933         uint                    flags,
 934         struct list_head        *buffer_list)
 935 {
 936         struct xfs_bmbt_irec    *map;
 937         int                     i, nmaps;       /* number of map entries */
 938         int                     error;          /* return value */
 939         xfs_fileoff_t           lblkno;
 940         xfs_filblks_t           maxlblkcnt;
 941         xfs_dqid_t              firstid;
 942         xfs_fsblock_t           rablkno;
 943         xfs_filblks_t           rablkcnt;
 944
 945         error = 0;
 946         /*
 947          * This looks racy, but we can't keep an inode lock across a
 948          * trans_reserve. But, this gets called during quotacheck, and that
 949          * happens only at mount time which is single threaded.
 950          */
 951         if (qip->i_d.di_nblocks == 0)
 952                 return 0;
 953
 954         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 955
 956         lblkno = 0;
 957         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 958         do {
 959                 uint            lock_mode;
 960
 961                 nmaps = XFS_DQITER_MAP_SIZE;
 962                 /*
 963                  * We aren't changing the inode itself. Just changing
 964                  * some of its data. No new blocks are added here, and
 965                  * the inode is never added to the transaction.
 966                  */
 967                 lock_mode = xfs_ilock_data_map_shared(qip);
 968                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 969                                        map, &nmaps, 0);
 970                 xfs_iunlock(qip, lock_mode);
 971                 if (error)
 972                         break;
 973
 974                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 975                 for (i = 0; i < nmaps; i++) {
 976                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 977                         ASSERT(map[i].br_blockcount);
 978
 979
 980                         lblkno += map[i].br_blockcount;
 981
 982                         if (map[i].br_startblock == HOLESTARTBLOCK)
 983                                 continue;
 984
 985                         firstid = (xfs_dqid_t) map[i].br_startoff *
 986                                 mp->m_quotainfo->qi_dqperchunk;
 987                         /*
 988                          * Do a read-ahead on the next extent.
 989                          */
 990                         if ((i+1 < nmaps) &&
 991                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 992                                 rablkcnt =  map[i+1].br_blockcount;
 993                                 rablkno = map[i+1].br_startblock;
 994                                 while (rablkcnt--) {
 995                                         xfs_buf_readahead(mp->m_ddev_targp,
 996                                                XFS_FSB_TO_DADDR(mp, rablkno),
 997                                                mp->m_quotainfo->qi_dqchunklen,
 998                                                &xfs_dquot_buf_ops);
 999                                         rablkno++;
1000                                 }
1001                         }
1002                         /*
1003                          * Iterate thru all the blks in the extent and
1004                          * reset the counters of all the dquots inside them.
1005                          */
1006                         error = xfs_qm_dqiter_bufs(mp, firstid,
1007                                                    map[i].br_startblock,
1008                                                    map[i].br_blockcount,
1009                                                    flags, buffer_list);
1010                         if (error)
1011                                 goto out;
1012                 }
1013         } while (nmaps > 0);
1014
1015 out:
1016         kmem_free(map);
1017         return error;
1018 }
1019
1020 /*
1021  * Called by dqusage_adjust in doing a quotacheck.
1022  *
1023  * Given the inode, and a dquot id this updates both the incore dqout as well
1024  * as the buffer copy. This is so that once the quotacheck is done, we can
1025  * just log all the buffers, as opposed to logging numerous updates to
1026  * individual dquots.
1027  */
1028 STATIC int
1029 xfs_qm_quotacheck_dqadjust(
1030         struct xfs_inode        *ip,
1031         xfs_dqid_t              id,
1032         uint                    type,
1033         xfs_qcnt_t              nblks,
1034         xfs_qcnt_t              rtblks)
1035 {
1036         struct xfs_mount        *mp = ip->i_mount;
1037         struct xfs_dquot        *dqp;
1038         int                     error;
1039
1040         error = xfs_qm_dqget(mp, ip, id, type,
1041                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1042         if (error) {
1043                 /*
1044                  * Shouldn't be able to turn off quotas here.
1045                  */
1046                 ASSERT(error != -ESRCH);
1047                 ASSERT(error != -ENOENT);
1048                 return error;
1049         }
1050
1051         trace_xfs_dqadjust(dqp);
1052
1053         /*
1054          * Adjust the inode count and the block count to reflect this inode's
1055          * resource usage.
1056          */
1057         be64_add_cpu(&dqp->q_core.d_icount, 1);
1058         dqp->q_res_icount++;
1059         if (nblks) {
1060                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1061                 dqp->q_res_bcount += nblks;
1062         }
1063         if (rtblks) {
1064                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1065                 dqp->q_res_rtbcount += rtblks;
1066         }
1067
1068         /*
1069          * Set default limits, adjust timers (since we changed usages)
1070          *
1071          * There are no timers for the default values set in the root dquot.
1072          */
1073         if (dqp->q_core.d_id) {
1074                 xfs_qm_adjust_dqlimits(mp, dqp);
1075                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1076         }
1077
1078         dqp->dq_flags |= XFS_DQ_DIRTY;
1079         xfs_qm_dqput(dqp);
1080         return 0;
1081 }
1082
1083 STATIC int
1084 xfs_qm_get_rtblks(
1085         xfs_inode_t     *ip,
1086         xfs_qcnt_t      *O_rtblks)
1087 {
1088         xfs_filblks_t   rtblks;                 /* total rt blks */
1089         xfs_extnum_t    idx;                    /* extent record index */
1090         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1091         xfs_extnum_t    nextents;               /* number of extent entries */
1092         int             error;
1093
1094         ASSERT(XFS_IS_REALTIME_INODE(ip));
1095         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1096         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1097                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1098                         return error;
1099         }
1100         rtblks = 0;
1101         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1102         for (idx = 0; idx < nextents; idx++)
1103                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1104         *O_rtblks = (xfs_qcnt_t)rtblks;
1105         return 0;
1106 }
1107
1108 /*
1109  * callback routine supplied to bulkstat(). Given an inumber, find its
1110  * dquots and update them to account for resources taken by that inode.
1111  */
1112 /* ARGSUSED */
1113 STATIC int
1114 xfs_qm_dqusage_adjust(
1115         xfs_mount_t     *mp,            /* mount point for filesystem */
1116         xfs_ino_t       ino,            /* inode number to get data for */
1117         void            __user *buffer, /* not used */
1118         int             ubsize,         /* not used */
1119         int             *ubused,        /* not used */
1120         int             *res)           /* result code value */
1121 {
1122         xfs_inode_t     *ip;
1123         xfs_qcnt_t      nblks, rtblks = 0;
1124         int             error;
1125
1126         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1127
1128         /*
1129          * rootino must have its resources accounted for, not so with the quota
1130          * inodes.
1131          */
1132         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1133                 *res = BULKSTAT_RV_NOTHING;
1134                 return -EINVAL;
1135         }
1136
1137         /*
1138          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1139          * interface expects the inode to be exclusively locked because that's
1140          * the case in all other instances. It's OK that we do this because
1141          * quotacheck is done only at mount time.
1142          */
1143         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1144         if (error) {
1145                 *res = BULKSTAT_RV_NOTHING;
1146                 return error;
1147         }
1148
1149         ASSERT(ip->i_delayed_blks == 0);
1150
1151         if (XFS_IS_REALTIME_INODE(ip)) {
1152                 /*
1153                  * Walk thru the extent list and count the realtime blocks.
1154                  */
1155                 error = xfs_qm_get_rtblks(ip, &rtblks);
1156                 if (error)
1157                         goto error0;
1158         }
1159
1160         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1161
1162         /*
1163          * Add the (disk blocks and inode) resources occupied by this
1164          * inode to its dquots. We do this adjustment in the incore dquot,
1165          * and also copy the changes to its buffer.
1166          * We don't care about putting these changes in a transaction
1167          * envelope because if we crash in the middle of a 'quotacheck'
1168          * we have to start from the beginning anyway.
1169          * Once we're done, we'll log all the dquot bufs.
1170          *
1171          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1172          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1173          */
1174         if (XFS_IS_UQUOTA_ON(mp)) {
1175                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1176                                                    XFS_DQ_USER, nblks, rtblks);
1177                 if (error)
1178                         goto error0;
1179         }
1180
1181         if (XFS_IS_GQUOTA_ON(mp)) {
1182                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1183                                                    XFS_DQ_GROUP, nblks, rtblks);
1184                 if (error)
1185                         goto error0;
1186         }
1187
1188         if (XFS_IS_PQUOTA_ON(mp)) {
1189                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1190                                                    XFS_DQ_PROJ, nblks, rtblks);
1191                 if (error)
1192                         goto error0;
1193         }
1194
1195         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1196         IRELE(ip);
1197         *res = BULKSTAT_RV_DIDONE;
1198         return 0;
1199
1200 error0:
1201         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1202         IRELE(ip);
1203         *res = BULKSTAT_RV_GIVEUP;
1204         return error;
1205 }
1206
1207 STATIC int
1208 xfs_qm_flush_one(
1209         struct xfs_dquot        *dqp,
1210         void                    *data)
1211 {
1212         struct list_head        *buffer_list = data;
1213         struct xfs_buf          *bp = NULL;
1214         int                     error = 0;
1215
1216         xfs_dqlock(dqp);
1217         if (dqp->dq_flags & XFS_DQ_FREEING)
1218                 goto out_unlock;
1219         if (!XFS_DQ_IS_DIRTY(dqp))
1220                 goto out_unlock;
1221
1222         xfs_dqflock(dqp);
1223         error = xfs_qm_dqflush(dqp, &bp);
1224         if (error)
1225                 goto out_unlock;
1226
1227         xfs_buf_delwri_queue(bp, buffer_list);
1228         xfs_buf_relse(bp);
1229 out_unlock:
1230         xfs_dqunlock(dqp);
1231         return error;
1232 }
1233
1234 /*
1235  * Walk thru all the filesystem inodes and construct a consistent view
1236  * of the disk quota world. If the quotacheck fails, disable quotas.
1237  */
1238 STATIC int
1239 xfs_qm_quotacheck(
1240         xfs_mount_t     *mp)
1241 {
1242         int                     done, count, error, error2;
1243         xfs_ino_t               lastino;
1244         size_t                  structsz;
1245         uint                    flags;
1246         LIST_HEAD               (buffer_list);
1247         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1248         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1249         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1250
1251         count = INT_MAX;
1252         structsz = 1;
1253         lastino = 0;
1254         flags = 0;
1255
1256         ASSERT(uip || gip || pip);
1257         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1258
1259         xfs_notice(mp, "Quotacheck needed: Please wait.");
1260
1261         /*
1262          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1263          * their counters to zero. We need a clean slate.
1264          * We don't log our changes till later.
1265          */
1266         if (uip) {
1267                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1268                                          &buffer_list);
1269                 if (error)
1270                         goto error_return;
1271                 flags |= XFS_UQUOTA_CHKD;
1272         }
1273
1274         if (gip) {
1275                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1276                                          &buffer_list);
1277                 if (error)
1278                         goto error_return;
1279                 flags |= XFS_GQUOTA_CHKD;
1280         }
1281
1282         if (pip) {
1283                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1284                                          &buffer_list);
1285                 if (error)
1286                         goto error_return;
1287                 flags |= XFS_PQUOTA_CHKD;
1288         }
1289
1290         do {
1291                 /*
1292                  * Iterate thru all the inodes in the file system,
1293                  * adjusting the corresponding dquot counters in core.
1294                  */
1295                 error = xfs_bulkstat(mp, &lastino, &count,
1296                                      xfs_qm_dqusage_adjust,
1297                                      structsz, NULL, &done);
1298                 if (error)
1299                         break;
1300
1301         } while (!done);
1302
1303         /*
1304          * We've made all the changes that we need to make incore.  Flush them
1305          * down to disk buffers if everything was updated successfully.
1306          */
1307         if (XFS_IS_UQUOTA_ON(mp)) {
1308                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1309                                           &buffer_list);
1310         }
1311         if (XFS_IS_GQUOTA_ON(mp)) {
1312                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1313                                            &buffer_list);
1314                 if (!error)
1315                         error = error2;
1316         }
1317         if (XFS_IS_PQUOTA_ON(mp)) {
1318                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1319                                            &buffer_list);
1320                 if (!error)
1321                         error = error2;
1322         }
1323
1324         error2 = xfs_buf_delwri_submit(&buffer_list);
1325         if (!error)
1326                 error = error2;
1327
1328         /*
1329          * We can get this error if we couldn't do a dquot allocation inside
1330          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1331          * dirty dquots that might be cached, we just want to get rid of them
1332          * and turn quotaoff. The dquots won't be attached to any of the inodes
1333          * at this point (because we intentionally didn't in dqget_noattach).
1334          */
1335         if (error) {
1336                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1337                 goto error_return;
1338         }
1339
1340         /*
1341          * If one type of quotas is off, then it will lose its
1342          * quotachecked status, since we won't be doing accounting for
1343          * that type anymore.
1344          */
1345         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1346         mp->m_qflags |= flags;
1347
1348  error_return:
1349         while (!list_empty(&buffer_list)) {
1350                 struct xfs_buf *bp =
1351                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1352                 list_del_init(&bp->b_list);
1353                 xfs_buf_relse(bp);
1354         }
1355
1356         if (error) {
1357                 xfs_warn(mp,
1358         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1359                         error);
1360                 /*
1361                  * We must turn off quotas.
1362                  */
1363                 ASSERT(mp->m_quotainfo != NULL);
1364                 xfs_qm_destroy_quotainfo(mp);
1365                 if (xfs_mount_reset_sbqflags(mp)) {
1366                         xfs_warn(mp,
1367                                 "Quotacheck: Failed to reset quota flags.");
1368                 }
1369         } else
1370                 xfs_notice(mp, "Quotacheck: Done.");
1371         return error;
1372 }
1373
1374 /*
1375  * This is called from xfs_mountfs to start quotas and initialize all
1376  * necessary data structures like quotainfo.  This is also responsible for
1377  * running a quotacheck as necessary.  We are guaranteed that the superblock
1378  * is consistently read in at this point.
1379  *
1380  * If we fail here, the mount will continue with quota turned off. We don't
1381  * need to inidicate success or failure at all.
1382  */
1383 void
1384 xfs_qm_mount_quotas(
1385         struct xfs_mount        *mp)
1386 {
1387         int                     error = 0;
1388         uint                    sbf;
1389
1390         /*
1391          * If quotas on realtime volumes is not supported, we disable
1392          * quotas immediately.
1393          */
1394         if (mp->m_sb.sb_rextents) {
1395                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1396                 mp->m_qflags = 0;
1397                 goto write_changes;
1398         }
1399
1400         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1401
1402         /*
1403          * Allocate the quotainfo structure inside the mount struct, and
1404          * create quotainode(s), and change/rev superblock if necessary.
1405          */
1406         error = xfs_qm_init_quotainfo(mp);
1407         if (error) {
1408                 /*
1409                  * We must turn off quotas.
1410                  */
1411                 ASSERT(mp->m_quotainfo == NULL);
1412                 mp->m_qflags = 0;
1413                 goto write_changes;
1414         }
1415         /*
1416          * If any of the quotas are not consistent, do a quotacheck.
1417          */
1418         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1419                 error = xfs_qm_quotacheck(mp);
1420                 if (error) {
1421                         /* Quotacheck failed and disabled quotas. */
1422                         return;
1423                 }
1424         }
1425         /*
1426          * If one type of quotas is off, then it will lose its
1427          * quotachecked status, since we won't be doing accounting for
1428          * that type anymore.
1429          */
1430         if (!XFS_IS_UQUOTA_ON(mp))
1431                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1432         if (!XFS_IS_GQUOTA_ON(mp))
1433                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1434         if (!XFS_IS_PQUOTA_ON(mp))
1435                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1436
1437  write_changes:
1438         /*
1439          * We actually don't have to acquire the m_sb_lock at all.
1440          * This can only be called from mount, and that's single threaded. XXX
1441          */
1442         spin_lock(&mp->m_sb_lock);
1443         sbf = mp->m_sb.sb_qflags;
1444         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1445         spin_unlock(&mp->m_sb_lock);
1446
1447         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1448                 if (xfs_sync_sb(mp, false)) {
1449                         /*
1450                          * We could only have been turning quotas off.
1451                          * We aren't in very good shape actually because
1452                          * the incore structures are convinced that quotas are
1453                          * off, but the on disk superblock doesn't know that !
1454                          */
1455                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1456                         xfs_alert(mp, "%s: Superblock update failed!",
1457                                 __func__);
1458                 }
1459         }
1460
1461         if (error) {
1462                 xfs_warn(mp, "Failed to initialize disk quotas.");
1463                 return;
1464         }
1465 }
1466
1467 /*
1468  * This is called after the superblock has been read in and we're ready to
1469  * iget the quota inodes.
1470  */
1471 STATIC int
1472 xfs_qm_init_quotainos(
1473         xfs_mount_t     *mp)
1474 {
1475         struct xfs_inode        *uip = NULL;
1476         struct xfs_inode        *gip = NULL;
1477         struct xfs_inode        *pip = NULL;
1478         int                     error;
1479         uint                    flags = 0;
1480
1481         ASSERT(mp->m_quotainfo);
1482
1483         /*
1484          * Get the uquota and gquota inodes
1485          */
1486         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1487                 if (XFS_IS_UQUOTA_ON(mp) &&
1488                     mp->m_sb.sb_uquotino != NULLFSINO) {
1489                         ASSERT(mp->m_sb.sb_uquotino > 0);
1490                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1491                                              0, 0, &uip);
1492                         if (error)
1493                                 return error;
1494                 }
1495                 if (XFS_IS_GQUOTA_ON(mp) &&
1496                     mp->m_sb.sb_gquotino != NULLFSINO) {
1497                         ASSERT(mp->m_sb.sb_gquotino > 0);
1498                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1499                                              0, 0, &gip);
1500                         if (error)
1501                                 goto error_rele;
1502                 }
1503                 if (XFS_IS_PQUOTA_ON(mp) &&
1504                     mp->m_sb.sb_pquotino != NULLFSINO) {
1505                         ASSERT(mp->m_sb.sb_pquotino > 0);
1506                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1507                                              0, 0, &pip);
1508                         if (error)
1509                                 goto error_rele;
1510                 }
1511         } else {
1512                 flags |= XFS_QMOPT_SBVERSION;
1513         }
1514
1515         /*
1516          * Create the three inodes, if they don't exist already. The changes
1517          * made above will get added to a transaction and logged in one of
1518          * the qino_alloc calls below.  If the device is readonly,
1519          * temporarily switch to read-write to do this.
1520          */
1521         if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1522                 error = xfs_qm_qino_alloc(mp, &uip,
1523                                               flags | XFS_QMOPT_UQUOTA);
1524                 if (error)
1525                         goto error_rele;
1526
1527                 flags &= ~XFS_QMOPT_SBVERSION;
1528         }
1529         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1530                 error = xfs_qm_qino_alloc(mp, &gip,
1531                                           flags | XFS_QMOPT_GQUOTA);
1532                 if (error)
1533                         goto error_rele;
1534
1535                 flags &= ~XFS_QMOPT_SBVERSION;
1536         }
1537         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1538                 error = xfs_qm_qino_alloc(mp, &pip,
1539                                           flags | XFS_QMOPT_PQUOTA);
1540                 if (error)
1541                         goto error_rele;
1542         }
1543
1544         mp->m_quotainfo->qi_uquotaip = uip;
1545         mp->m_quotainfo->qi_gquotaip = gip;
1546         mp->m_quotainfo->qi_pquotaip = pip;
1547
1548         return 0;
1549
1550 error_rele:
1551         if (uip)
1552                 IRELE(uip);
1553         if (gip)
1554                 IRELE(gip);
1555         if (pip)
1556                 IRELE(pip);
1557         return error;
1558 }
1559
1560 STATIC void
1561 xfs_qm_dqfree_one(
1562         struct xfs_dquot        *dqp)
1563 {
1564         struct xfs_mount        *mp = dqp->q_mount;
1565         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1566
1567         mutex_lock(&qi->qi_tree_lock);
1568         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1569                           be32_to_cpu(dqp->q_core.d_id));
1570
1571         qi->qi_dquots--;
1572         mutex_unlock(&qi->qi_tree_lock);
1573
1574         xfs_qm_dqdestroy(dqp);
1575 }
1576
1577 /* --------------- utility functions for vnodeops ---------------- */
1578
1579
1580 /*
1581  * Given an inode, a uid, gid and prid make sure that we have
1582  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1583  * quotas by creating this file.
1584  * This also attaches dquot(s) to the given inode after locking it,
1585  * and returns the dquots corresponding to the uid and/or gid.
1586  *
1587  * in   : inode (unlocked)
1588  * out  : udquot, gdquot with references taken and unlocked
1589  */
1590 int
1591 xfs_qm_vop_dqalloc(
1592         struct xfs_inode        *ip,
1593         xfs_dqid_t              uid,
1594         xfs_dqid_t              gid,
1595         prid_t                  prid,
1596         uint                    flags,
1597         struct xfs_dquot        **O_udqpp,
1598         struct xfs_dquot        **O_gdqpp,
1599         struct xfs_dquot        **O_pdqpp)
1600 {
1601         struct xfs_mount        *mp = ip->i_mount;
1602         struct xfs_dquot        *uq = NULL;
1603         struct xfs_dquot        *gq = NULL;
1604         struct xfs_dquot        *pq = NULL;
1605         int                     error;
1606         uint                    lockflags;
1607
1608         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1609                 return 0;
1610
1611         lockflags = XFS_ILOCK_EXCL;
1612         xfs_ilock(ip, lockflags);
1613
1614         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1615                 gid = ip->i_d.di_gid;
1616
1617         /*
1618          * Attach the dquot(s) to this inode, doing a dquot allocation
1619          * if necessary. The dquot(s) will not be locked.
1620          */
1621         if (XFS_NOT_DQATTACHED(mp, ip)) {
1622                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1623                 if (error) {
1624                         xfs_iunlock(ip, lockflags);
1625                         return error;
1626                 }
1627         }
1628
1629         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1630                 if (ip->i_d.di_uid != uid) {
1631                         /*
1632                          * What we need is the dquot that has this uid, and
1633                          * if we send the inode to dqget, the uid of the inode
1634                          * takes priority over what's sent in the uid argument.
1635                          * We must unlock inode here before calling dqget if
1636                          * we're not sending the inode, because otherwise
1637                          * we'll deadlock by doing trans_reserve while
1638                          * holding ilock.
1639                          */
1640                         xfs_iunlock(ip, lockflags);
1641                         error = xfs_qm_dqget(mp, NULL, uid,
1642                                                  XFS_DQ_USER,
1643                                                  XFS_QMOPT_DQALLOC |
1644                                                  XFS_QMOPT_DOWARN,
1645                                                  &uq);
1646                         if (error) {
1647                                 ASSERT(error != -ENOENT);
1648                                 return error;
1649                         }
1650                         /*
1651                          * Get the ilock in the right order.
1652                          */
1653                         xfs_dqunlock(uq);
1654                         lockflags = XFS_ILOCK_SHARED;
1655                         xfs_ilock(ip, lockflags);
1656                 } else {
1657                         /*
1658                          * Take an extra reference, because we'll return
1659                          * this to caller
1660                          */
1661                         ASSERT(ip->i_udquot);
1662                         uq = xfs_qm_dqhold(ip->i_udquot);
1663                 }
1664         }
1665         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1666                 if (ip->i_d.di_gid != gid) {
1667                         xfs_iunlock(ip, lockflags);
1668                         error = xfs_qm_dqget(mp, NULL, gid,
1669                                                  XFS_DQ_GROUP,
1670                                                  XFS_QMOPT_DQALLOC |
1671                                                  XFS_QMOPT_DOWARN,
1672                                                  &gq);
1673                         if (error) {
1674                                 ASSERT(error != -ENOENT);
1675                                 goto error_rele;
1676                         }
1677                         xfs_dqunlock(gq);
1678                         lockflags = XFS_ILOCK_SHARED;
1679                         xfs_ilock(ip, lockflags);
1680                 } else {
1681                         ASSERT(ip->i_gdquot);
1682                         gq = xfs_qm_dqhold(ip->i_gdquot);
1683                 }
1684         }
1685         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1686                 if (xfs_get_projid(ip) != prid) {
1687                         xfs_iunlock(ip, lockflags);
1688                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1689                                                  XFS_DQ_PROJ,
1690                                                  XFS_QMOPT_DQALLOC |
1691                                                  XFS_QMOPT_DOWARN,
1692                                                  &pq);
1693                         if (error) {
1694                                 ASSERT(error != -ENOENT);
1695                                 goto error_rele;
1696                         }
1697                         xfs_dqunlock(pq);
1698                         lockflags = XFS_ILOCK_SHARED;
1699                         xfs_ilock(ip, lockflags);
1700                 } else {
1701                         ASSERT(ip->i_pdquot);
1702                         pq = xfs_qm_dqhold(ip->i_pdquot);
1703                 }
1704         }
1705         if (uq)
1706                 trace_xfs_dquot_dqalloc(ip);
1707
1708         xfs_iunlock(ip, lockflags);
1709         if (O_udqpp)
1710                 *O_udqpp = uq;
1711         else
1712                 xfs_qm_dqrele(uq);
1713         if (O_gdqpp)
1714                 *O_gdqpp = gq;
1715         else
1716                 xfs_qm_dqrele(gq);
1717         if (O_pdqpp)
1718                 *O_pdqpp = pq;
1719         else
1720                 xfs_qm_dqrele(pq);
1721         return 0;
1722
1723 error_rele:
1724         xfs_qm_dqrele(gq);
1725         xfs_qm_dqrele(uq);
1726         return error;
1727 }
1728
1729 /*
1730  * Actually transfer ownership, and do dquot modifications.
1731  * These were already reserved.
1732  */
1733 xfs_dquot_t *
1734 xfs_qm_vop_chown(
1735         xfs_trans_t     *tp,
1736         xfs_inode_t     *ip,
1737         xfs_dquot_t     **IO_olddq,
1738         xfs_dquot_t     *newdq)
1739 {
1740         xfs_dquot_t     *prevdq;
1741         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1742                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1743
1744
1745         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1746         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1747
1748         /* old dquot */
1749         prevdq = *IO_olddq;
1750         ASSERT(prevdq);
1751         ASSERT(prevdq != newdq);
1752
1753         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1754         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1755
1756         /* the sparkling new dquot */
1757         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1758         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1759
1760         /*
1761          * Take an extra reference, because the inode is going to keep
1762          * this dquot pointer even after the trans_commit.
1763          */
1764         *IO_olddq = xfs_qm_dqhold(newdq);
1765
1766         return prevdq;
1767 }
1768
1769 /*
1770  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1771  */
1772 int
1773 xfs_qm_vop_chown_reserve(
1774         struct xfs_trans        *tp,
1775         struct xfs_inode        *ip,
1776         struct xfs_dquot        *udqp,
1777         struct xfs_dquot        *gdqp,
1778         struct xfs_dquot        *pdqp,
1779         uint                    flags)
1780 {
1781         struct xfs_mount        *mp = ip->i_mount;
1782         uint                    delblks, blkflags, prjflags = 0;
1783         struct xfs_dquot        *udq_unres = NULL;
1784         struct xfs_dquot        *gdq_unres = NULL;
1785         struct xfs_dquot        *pdq_unres = NULL;
1786         struct xfs_dquot        *udq_delblks = NULL;
1787         struct xfs_dquot        *gdq_delblks = NULL;
1788         struct xfs_dquot        *pdq_delblks = NULL;
1789         int                     error;
1790
1791
1792         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1793         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1794
1795         delblks = ip->i_delayed_blks;
1796         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1797                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1798
1799         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1800             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1801                 udq_delblks = udqp;
1802                 /*
1803                  * If there are delayed allocation blocks, then we have to
1804                  * unreserve those from the old dquot, and add them to the
1805                  * new dquot.
1806                  */
1807                 if (delblks) {
1808                         ASSERT(ip->i_udquot);
1809                         udq_unres = ip->i_udquot;
1810                 }
1811         }
1812         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1813             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1814                 gdq_delblks = gdqp;
1815                 if (delblks) {
1816                         ASSERT(ip->i_gdquot);
1817                         gdq_unres = ip->i_gdquot;
1818                 }
1819         }
1820
1821         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1822             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1823                 prjflags = XFS_QMOPT_ENOSPC;
1824                 pdq_delblks = pdqp;
1825                 if (delblks) {
1826                         ASSERT(ip->i_pdquot);
1827                         pdq_unres = ip->i_pdquot;
1828                 }
1829         }
1830
1831         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1832                                 udq_delblks, gdq_delblks, pdq_delblks,
1833                                 ip->i_d.di_nblocks, 1,
1834                                 flags | blkflags | prjflags);
1835         if (error)
1836                 return error;
1837
1838         /*
1839          * Do the delayed blks reservations/unreservations now. Since, these
1840          * are done without the help of a transaction, if a reservation fails
1841          * its previous reservations won't be automatically undone by trans
1842          * code. So, we have to do it manually here.
1843          */
1844         if (delblks) {
1845                 /*
1846                  * Do the reservations first. Unreservation can't fail.
1847                  */
1848                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1849                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1850                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1851                             udq_delblks, gdq_delblks, pdq_delblks,
1852                             (xfs_qcnt_t)delblks, 0,
1853                             flags | blkflags | prjflags);
1854                 if (error)
1855                         return error;
1856                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1857                                 udq_unres, gdq_unres, pdq_unres,
1858                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1859         }
1860
1861         return 0;
1862 }
1863
1864 int
1865 xfs_qm_vop_rename_dqattach(
1866         struct xfs_inode        **i_tab)
1867 {
1868         struct xfs_mount        *mp = i_tab[0]->i_mount;
1869         int                     i;
1870
1871         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1872                 return 0;
1873
1874         for (i = 0; (i < 4 && i_tab[i]); i++) {
1875                 struct xfs_inode        *ip = i_tab[i];
1876                 int                     error;
1877
1878                 /*
1879                  * Watch out for duplicate entries in the table.
1880                  */
1881                 if (i == 0 || ip != i_tab[i-1]) {
1882                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1883                                 error = xfs_qm_dqattach(ip, 0);
1884                                 if (error)
1885                                         return error;
1886                         }
1887                 }
1888         }
1889         return 0;
1890 }
1891
1892 void
1893 xfs_qm_vop_create_dqattach(
1894         struct xfs_trans        *tp,
1895         struct xfs_inode        *ip,
1896         struct xfs_dquot        *udqp,
1897         struct xfs_dquot        *gdqp,
1898         struct xfs_dquot        *pdqp)
1899 {
1900         struct xfs_mount        *mp = tp->t_mountp;
1901
1902         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1903                 return;
1904
1905         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1906         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1907
1908         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1909                 ASSERT(ip->i_udquot == NULL);
1910                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1911
1912                 ip->i_udquot = xfs_qm_dqhold(udqp);
1913                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1914         }
1915         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1916                 ASSERT(ip->i_gdquot == NULL);
1917                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1918                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1919                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1920         }
1921         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1922                 ASSERT(ip->i_pdquot == NULL);
1923                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1924
1925                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1926                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1927         }
1928 }
1929