kernel/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         bool            need_alloc = true;
 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                         need_alloc = false;
 752                 }
 753         }
 754
 755         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 756         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
 757                                   XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
 758         if (error) {
 759                 xfs_trans_cancel(tp, 0);
 760                 return error;
 761         }
 762
 763         if (need_alloc) {
 764                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 765                                                                 &committed);
 766                 if (error) {
 767                         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 768                                          XFS_TRANS_ABORT);
 769                         return error;
 770                 }
 771         }
 772
 773         /*
 774          * Make the changes in the superblock, and log those too.
 775          * sbfields arg may contain fields other than *QUOTINO;
 776          * VERSIONNUM for example.
 777          */
 778         spin_lock(&mp->m_sb_lock);
 779         if (flags & XFS_QMOPT_SBVERSION) {
 780                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 781
 782                 xfs_sb_version_addquota(&mp->m_sb);
 783                 mp->m_sb.sb_uquotino = NULLFSINO;
 784                 mp->m_sb.sb_gquotino = NULLFSINO;
 785                 mp->m_sb.sb_pquotino = NULLFSINO;
 786
 787                 /* qflags will get updated fully _after_ quotacheck */
 788                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 789         }
 790         if (flags & XFS_QMOPT_UQUOTA)
 791                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 792         else if (flags & XFS_QMOPT_GQUOTA)
 793                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 794         else
 795                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 796         spin_unlock(&mp->m_sb_lock);
 797         xfs_log_sb(tp);
 798
 799         error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
 800         if (error) {
 801                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 802                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 803         }
 804         if (need_alloc)
 805                 xfs_finish_inode_setup(*ip);
 806         return error;
 807 }
 808
 809
 810 STATIC void
 811 xfs_qm_reset_dqcounts(
 812         xfs_mount_t     *mp,
 813         xfs_buf_t       *bp,
 814         xfs_dqid_t      id,
 815         uint            type)
 816 {
 817         struct xfs_dqblk        *dqb;
 818         int                     j;
 819
 820         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 821
 822         /*
 823          * Reset all counters and timers. They'll be
 824          * started afresh by xfs_qm_quotacheck.
 825          */
 826 #ifdef DEBUG
 827         j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 828         do_div(j, sizeof(xfs_dqblk_t));
 829         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 830 #endif
 831         dqb = bp->b_addr;
 832         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 833                 struct xfs_disk_dquot   *ddq;
 834
 835                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 836
 837                 /*
 838                  * Do a sanity check, and if needed, repair the dqblk. Don't
 839                  * output any warnings because it's perfectly possible to
 840                  * find uninitialised dquot blks. See comment in xfs_dqcheck.
 841                  */
 842                 xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 843                             "xfs_quotacheck");
 844                 /*
 845                  * Reset type in case we are reusing group quota file for
 846                  * project quotas or vice versa
 847                  */
 848                 ddq->d_flags = type;
 849                 ddq->d_bcount = 0;
 850                 ddq->d_icount = 0;
 851                 ddq->d_rtbcount = 0;
 852                 ddq->d_btimer = 0;
 853                 ddq->d_itimer = 0;
 854                 ddq->d_rtbtimer = 0;
 855                 ddq->d_bwarns = 0;
 856                 ddq->d_iwarns = 0;
 857                 ddq->d_rtbwarns = 0;
 858
 859                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 860                         xfs_update_cksum((char *)&dqb[j],
 861                                          sizeof(struct xfs_dqblk),
 862                                          XFS_DQUOT_CRC_OFF);
 863                 }
 864         }
 865 }
 866
 867 STATIC int
 868 xfs_qm_dqiter_bufs(
 869         struct xfs_mount        *mp,
 870         xfs_dqid_t              firstid,
 871         xfs_fsblock_t           bno,
 872         xfs_filblks_t           blkcnt,
 873         uint                    flags,
 874         struct list_head        *buffer_list)
 875 {
 876         struct xfs_buf          *bp;
 877         int                     error;
 878         int                     type;
 879
 880         ASSERT(blkcnt > 0);
 881         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 882                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 883         error = 0;
 884
 885         /*
 886          * Blkcnt arg can be a very big number, and might even be
 887          * larger than the log itself. So, we have to break it up into
 888          * manageable-sized transactions.
 889          * Note that we don't start a permanent transaction here; we might
 890          * not be able to get a log reservation for the whole thing up front,
 891          * and we don't really care to either, because we just discard
 892          * everything if we were to crash in the middle of this loop.
 893          */
 894         while (blkcnt--) {
 895                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 896                               XFS_FSB_TO_DADDR(mp, bno),
 897                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 898                               &xfs_dquot_buf_ops);
 899
 900                 /*
 901                  * CRC and validation errors will return a EFSCORRUPTED here. If
 902                  * this occurs, re-read without CRC validation so that we can
 903                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 904                  * will leave a trace in the log indicating corruption has
 905                  * been detected.
 906                  */
 907                 if (error == -EFSCORRUPTED) {
 908                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 909                                       XFS_FSB_TO_DADDR(mp, bno),
 910                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 911                                       NULL);
 912                 }
 913
 914                 if (error)
 915                         break;
 916
 917                 /*
 918                  * A corrupt buffer might not have a verifier attached, so
 919                  * make sure we have the correct one attached before writeback
 920                  * occurs.
 921                  */
 922                 bp->b_ops = &xfs_dquot_buf_ops;
 923                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 924                 xfs_buf_delwri_queue(bp, buffer_list);
 925                 xfs_buf_relse(bp);
 926
 927                 /* goto the next block. */
 928                 bno++;
 929                 firstid += mp->m_quotainfo->qi_dqperchunk;
 930         }
 931
 932         return error;
 933 }
 934
 935 /*
 936  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 937  * caller supplied function for every chunk of dquots that we find.
 938  */
 939 STATIC int
 940 xfs_qm_dqiterate(
 941         struct xfs_mount        *mp,
 942         struct xfs_inode        *qip,
 943         uint                    flags,
 944         struct list_head        *buffer_list)
 945 {
 946         struct xfs_bmbt_irec    *map;
 947         int                     i, nmaps;       /* number of map entries */
 948         int                     error;          /* return value */
 949         xfs_fileoff_t           lblkno;
 950         xfs_filblks_t           maxlblkcnt;
 951         xfs_dqid_t              firstid;
 952         xfs_fsblock_t           rablkno;
 953         xfs_filblks_t           rablkcnt;
 954
 955         error = 0;
 956         /*
 957          * This looks racy, but we can't keep an inode lock across a
 958          * trans_reserve. But, this gets called during quotacheck, and that
 959          * happens only at mount time which is single threaded.
 960          */
 961         if (qip->i_d.di_nblocks == 0)
 962                 return 0;
 963
 964         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 965
 966         lblkno = 0;
 967         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 968         do {
 969                 uint            lock_mode;
 970
 971                 nmaps = XFS_DQITER_MAP_SIZE;
 972                 /*
 973                  * We aren't changing the inode itself. Just changing
 974                  * some of its data. No new blocks are added here, and
 975                  * the inode is never added to the transaction.
 976                  */
 977                 lock_mode = xfs_ilock_data_map_shared(qip);
 978                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 979                                        map, &nmaps, 0);
 980                 xfs_iunlock(qip, lock_mode);
 981                 if (error)
 982                         break;
 983
 984                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 985                 for (i = 0; i < nmaps; i++) {
 986                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 987                         ASSERT(map[i].br_blockcount);
 988
 989
 990                         lblkno += map[i].br_blockcount;
 991
 992                         if (map[i].br_startblock == HOLESTARTBLOCK)
 993                                 continue;
 994
 995                         firstid = (xfs_dqid_t) map[i].br_startoff *
 996                                 mp->m_quotainfo->qi_dqperchunk;
 997                         /*
 998                          * Do a read-ahead on the next extent.
 999                          */
1000                         if ((i+1 < nmaps) &&
1001                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1002                                 rablkcnt =  map[i+1].br_blockcount;
1003                                 rablkno = map[i+1].br_startblock;
1004                                 while (rablkcnt--) {
1005                                         xfs_buf_readahead(mp->m_ddev_targp,
1006                                                XFS_FSB_TO_DADDR(mp, rablkno),
1007                                                mp->m_quotainfo->qi_dqchunklen,
1008                                                &xfs_dquot_buf_ops);
1009                                         rablkno++;
1010                                 }
1011                         }
1012                         /*
1013                          * Iterate thru all the blks in the extent and
1014                          * reset the counters of all the dquots inside them.
1015                          */
1016                         error = xfs_qm_dqiter_bufs(mp, firstid,
1017                                                    map[i].br_startblock,
1018                                                    map[i].br_blockcount,
1019                                                    flags, buffer_list);
1020                         if (error)
1021                                 goto out;
1022                 }
1023         } while (nmaps > 0);
1024
1025 out:
1026         kmem_free(map);
1027         return error;
1028 }
1029
1030 /*
1031  * Called by dqusage_adjust in doing a quotacheck.
1032  *
1033  * Given the inode, and a dquot id this updates both the incore dqout as well
1034  * as the buffer copy. This is so that once the quotacheck is done, we can
1035  * just log all the buffers, as opposed to logging numerous updates to
1036  * individual dquots.
1037  */
1038 STATIC int
1039 xfs_qm_quotacheck_dqadjust(
1040         struct xfs_inode        *ip,
1041         xfs_dqid_t              id,
1042         uint                    type,
1043         xfs_qcnt_t              nblks,
1044         xfs_qcnt_t              rtblks)
1045 {
1046         struct xfs_mount        *mp = ip->i_mount;
1047         struct xfs_dquot        *dqp;
1048         int                     error;
1049
1050         error = xfs_qm_dqget(mp, ip, id, type,
1051                              XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1052         if (error) {
1053                 /*
1054                  * Shouldn't be able to turn off quotas here.
1055                  */
1056                 ASSERT(error != -ESRCH);
1057                 ASSERT(error != -ENOENT);
1058                 return error;
1059         }
1060
1061         trace_xfs_dqadjust(dqp);
1062
1063         /*
1064          * Adjust the inode count and the block count to reflect this inode's
1065          * resource usage.
1066          */
1067         be64_add_cpu(&dqp->q_core.d_icount, 1);
1068         dqp->q_res_icount++;
1069         if (nblks) {
1070                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1071                 dqp->q_res_bcount += nblks;
1072         }
1073         if (rtblks) {
1074                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1075                 dqp->q_res_rtbcount += rtblks;
1076         }
1077
1078         /*
1079          * Set default limits, adjust timers (since we changed usages)
1080          *
1081          * There are no timers for the default values set in the root dquot.
1082          */
1083         if (dqp->q_core.d_id) {
1084                 xfs_qm_adjust_dqlimits(mp, dqp);
1085                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1086         }
1087
1088         dqp->dq_flags |= XFS_DQ_DIRTY;
1089         xfs_qm_dqput(dqp);
1090         return 0;
1091 }
1092
1093 STATIC int
1094 xfs_qm_get_rtblks(
1095         xfs_inode_t     *ip,
1096         xfs_qcnt_t      *O_rtblks)
1097 {
1098         xfs_filblks_t   rtblks;                 /* total rt blks */
1099         xfs_extnum_t    idx;                    /* extent record index */
1100         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1101         xfs_extnum_t    nextents;               /* number of extent entries */
1102         int             error;
1103
1104         ASSERT(XFS_IS_REALTIME_INODE(ip));
1105         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1106         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1107                 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1108                         return error;
1109         }
1110         rtblks = 0;
1111         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1112         for (idx = 0; idx < nextents; idx++)
1113                 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1114         *O_rtblks = (xfs_qcnt_t)rtblks;
1115         return 0;
1116 }
1117
1118 /*
1119  * callback routine supplied to bulkstat(). Given an inumber, find its
1120  * dquots and update them to account for resources taken by that inode.
1121  */
1122 /* ARGSUSED */
1123 STATIC int
1124 xfs_qm_dqusage_adjust(
1125         xfs_mount_t     *mp,            /* mount point for filesystem */
1126         xfs_ino_t       ino,            /* inode number to get data for */
1127         void            __user *buffer, /* not used */
1128         int             ubsize,         /* not used */
1129         int             *ubused,        /* not used */
1130         int             *res)           /* result code value */
1131 {
1132         xfs_inode_t     *ip;
1133         xfs_qcnt_t      nblks, rtblks = 0;
1134         int             error;
1135
1136         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1137
1138         /*
1139          * rootino must have its resources accounted for, not so with the quota
1140          * inodes.
1141          */
1142         if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1143                 *res = BULKSTAT_RV_NOTHING;
1144                 return -EINVAL;
1145         }
1146
1147         /*
1148          * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1149          * interface expects the inode to be exclusively locked because that's
1150          * the case in all other instances. It's OK that we do this because
1151          * quotacheck is done only at mount time.
1152          */
1153         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1154         if (error) {
1155                 *res = BULKSTAT_RV_NOTHING;
1156                 return error;
1157         }
1158
1159         ASSERT(ip->i_delayed_blks == 0);
1160
1161         if (XFS_IS_REALTIME_INODE(ip)) {
1162                 /*
1163                  * Walk thru the extent list and count the realtime blocks.
1164                  */
1165                 error = xfs_qm_get_rtblks(ip, &rtblks);
1166                 if (error)
1167                         goto error0;
1168         }
1169
1170         nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1171
1172         /*
1173          * Add the (disk blocks and inode) resources occupied by this
1174          * inode to its dquots. We do this adjustment in the incore dquot,
1175          * and also copy the changes to its buffer.
1176          * We don't care about putting these changes in a transaction
1177          * envelope because if we crash in the middle of a 'quotacheck'
1178          * we have to start from the beginning anyway.
1179          * Once we're done, we'll log all the dquot bufs.
1180          *
1181          * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1182          * and quotaoffs don't race. (Quotachecks happen at mount time only).
1183          */
1184         if (XFS_IS_UQUOTA_ON(mp)) {
1185                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1186                                                    XFS_DQ_USER, nblks, rtblks);
1187                 if (error)
1188                         goto error0;
1189         }
1190
1191         if (XFS_IS_GQUOTA_ON(mp)) {
1192                 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1193                                                    XFS_DQ_GROUP, nblks, rtblks);
1194                 if (error)
1195                         goto error0;
1196         }
1197
1198         if (XFS_IS_PQUOTA_ON(mp)) {
1199                 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1200                                                    XFS_DQ_PROJ, nblks, rtblks);
1201                 if (error)
1202                         goto error0;
1203         }
1204
1205         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1206         IRELE(ip);
1207         *res = BULKSTAT_RV_DIDONE;
1208         return 0;
1209
1210 error0:
1211         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1212         IRELE(ip);
1213         *res = BULKSTAT_RV_GIVEUP;
1214         return error;
1215 }
1216
1217 STATIC int
1218 xfs_qm_flush_one(
1219         struct xfs_dquot        *dqp,
1220         void                    *data)
1221 {
1222         struct list_head        *buffer_list = data;
1223         struct xfs_buf          *bp = NULL;
1224         int                     error = 0;
1225
1226         xfs_dqlock(dqp);
1227         if (dqp->dq_flags & XFS_DQ_FREEING)
1228                 goto out_unlock;
1229         if (!XFS_DQ_IS_DIRTY(dqp))
1230                 goto out_unlock;
1231
1232         xfs_dqflock(dqp);
1233         error = xfs_qm_dqflush(dqp, &bp);
1234         if (error)
1235                 goto out_unlock;
1236
1237         xfs_buf_delwri_queue(bp, buffer_list);
1238         xfs_buf_relse(bp);
1239 out_unlock:
1240         xfs_dqunlock(dqp);
1241         return error;
1242 }
1243
1244 /*
1245  * Walk thru all the filesystem inodes and construct a consistent view
1246  * of the disk quota world. If the quotacheck fails, disable quotas.
1247  */
1248 STATIC int
1249 xfs_qm_quotacheck(
1250         xfs_mount_t     *mp)
1251 {
1252         int                     done, count, error, error2;
1253         xfs_ino_t               lastino;
1254         size_t                  structsz;
1255         uint                    flags;
1256         LIST_HEAD               (buffer_list);
1257         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1258         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1259         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1260
1261         count = INT_MAX;
1262         structsz = 1;
1263         lastino = 0;
1264         flags = 0;
1265
1266         ASSERT(uip || gip || pip);
1267         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1268
1269         xfs_notice(mp, "Quotacheck needed: Please wait.");
1270
1271         /*
1272          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1273          * their counters to zero. We need a clean slate.
1274          * We don't log our changes till later.
1275          */
1276         if (uip) {
1277                 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1278                                          &buffer_list);
1279                 if (error)
1280                         goto error_return;
1281                 flags |= XFS_UQUOTA_CHKD;
1282         }
1283
1284         if (gip) {
1285                 error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1286                                          &buffer_list);
1287                 if (error)
1288                         goto error_return;
1289                 flags |= XFS_GQUOTA_CHKD;
1290         }
1291
1292         if (pip) {
1293                 error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1294                                          &buffer_list);
1295                 if (error)
1296                         goto error_return;
1297                 flags |= XFS_PQUOTA_CHKD;
1298         }
1299
1300         do {
1301                 /*
1302                  * Iterate thru all the inodes in the file system,
1303                  * adjusting the corresponding dquot counters in core.
1304                  */
1305                 error = xfs_bulkstat(mp, &lastino, &count,
1306                                      xfs_qm_dqusage_adjust,
1307                                      structsz, NULL, &done);
1308                 if (error)
1309                         break;
1310
1311         } while (!done);
1312
1313         /*
1314          * We've made all the changes that we need to make incore.  Flush them
1315          * down to disk buffers if everything was updated successfully.
1316          */
1317         if (XFS_IS_UQUOTA_ON(mp)) {
1318                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1319                                           &buffer_list);
1320         }
1321         if (XFS_IS_GQUOTA_ON(mp)) {
1322                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1323                                            &buffer_list);
1324                 if (!error)
1325                         error = error2;
1326         }
1327         if (XFS_IS_PQUOTA_ON(mp)) {
1328                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1329                                            &buffer_list);
1330                 if (!error)
1331                         error = error2;
1332         }
1333
1334         error2 = xfs_buf_delwri_submit(&buffer_list);
1335         if (!error)
1336                 error = error2;
1337
1338         /*
1339          * We can get this error if we couldn't do a dquot allocation inside
1340          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1341          * dirty dquots that might be cached, we just want to get rid of them
1342          * and turn quotaoff. The dquots won't be attached to any of the inodes
1343          * at this point (because we intentionally didn't in dqget_noattach).
1344          */
1345         if (error) {
1346                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1347                 goto error_return;
1348         }
1349
1350         /*
1351          * If one type of quotas is off, then it will lose its
1352          * quotachecked status, since we won't be doing accounting for
1353          * that type anymore.
1354          */
1355         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1356         mp->m_qflags |= flags;
1357
1358  error_return:
1359         while (!list_empty(&buffer_list)) {
1360                 struct xfs_buf *bp =
1361                         list_first_entry(&buffer_list, struct xfs_buf, b_list);
1362                 list_del_init(&bp->b_list);
1363                 xfs_buf_relse(bp);
1364         }
1365
1366         if (error) {
1367                 xfs_warn(mp,
1368         "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1369                         error);
1370                 /*
1371                  * We must turn off quotas.
1372                  */
1373                 ASSERT(mp->m_quotainfo != NULL);
1374                 xfs_qm_destroy_quotainfo(mp);
1375                 if (xfs_mount_reset_sbqflags(mp)) {
1376                         xfs_warn(mp,
1377                                 "Quotacheck: Failed to reset quota flags.");
1378                 }
1379         } else
1380                 xfs_notice(mp, "Quotacheck: Done.");
1381         return error;
1382 }
1383
1384 /*
1385  * This is called from xfs_mountfs to start quotas and initialize all
1386  * necessary data structures like quotainfo.  This is also responsible for
1387  * running a quotacheck as necessary.  We are guaranteed that the superblock
1388  * is consistently read in at this point.
1389  *
1390  * If we fail here, the mount will continue with quota turned off. We don't
1391  * need to inidicate success or failure at all.
1392  */
1393 void
1394 xfs_qm_mount_quotas(
1395         struct xfs_mount        *mp)
1396 {
1397         int                     error = 0;
1398         uint                    sbf;
1399
1400         /*
1401          * If quotas on realtime volumes is not supported, we disable
1402          * quotas immediately.
1403          */
1404         if (mp->m_sb.sb_rextents) {
1405                 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1406                 mp->m_qflags = 0;
1407                 goto write_changes;
1408         }
1409
1410         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1411
1412         /*
1413          * Allocate the quotainfo structure inside the mount struct, and
1414          * create quotainode(s), and change/rev superblock if necessary.
1415          */
1416         error = xfs_qm_init_quotainfo(mp);
1417         if (error) {
1418                 /*
1419                  * We must turn off quotas.
1420                  */
1421                 ASSERT(mp->m_quotainfo == NULL);
1422                 mp->m_qflags = 0;
1423                 goto write_changes;
1424         }
1425         /*
1426          * If any of the quotas are not consistent, do a quotacheck.
1427          */
1428         if (XFS_QM_NEED_QUOTACHECK(mp)) {
1429                 error = xfs_qm_quotacheck(mp);
1430                 if (error) {
1431                         /* Quotacheck failed and disabled quotas. */
1432                         return;
1433                 }
1434         }
1435         /*
1436          * If one type of quotas is off, then it will lose its
1437          * quotachecked status, since we won't be doing accounting for
1438          * that type anymore.
1439          */
1440         if (!XFS_IS_UQUOTA_ON(mp))
1441                 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1442         if (!XFS_IS_GQUOTA_ON(mp))
1443                 mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1444         if (!XFS_IS_PQUOTA_ON(mp))
1445                 mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1446
1447  write_changes:
1448         /*
1449          * We actually don't have to acquire the m_sb_lock at all.
1450          * This can only be called from mount, and that's single threaded. XXX
1451          */
1452         spin_lock(&mp->m_sb_lock);
1453         sbf = mp->m_sb.sb_qflags;
1454         mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1455         spin_unlock(&mp->m_sb_lock);
1456
1457         if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1458                 if (xfs_sync_sb(mp, false)) {
1459                         /*
1460                          * We could only have been turning quotas off.
1461                          * We aren't in very good shape actually because
1462                          * the incore structures are convinced that quotas are
1463                          * off, but the on disk superblock doesn't know that !
1464                          */
1465                         ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1466                         xfs_alert(mp, "%s: Superblock update failed!",
1467                                 __func__);
1468                 }
1469         }
1470
1471         if (error) {
1472                 xfs_warn(mp, "Failed to initialize disk quotas.");
1473                 return;
1474         }
1475 }
1476
1477 /*
1478  * This is called after the superblock has been read in and we're ready to
1479  * iget the quota inodes.
1480  */
1481 STATIC int
1482 xfs_qm_init_quotainos(
1483         xfs_mount_t     *mp)
1484 {
1485         struct xfs_inode        *uip = NULL;
1486         struct xfs_inode        *gip = NULL;
1487         struct xfs_inode        *pip = NULL;
1488         int                     error;
1489         uint                    flags = 0;
1490
1491         ASSERT(mp->m_quotainfo);
1492
1493         /*
1494          * Get the uquota and gquota inodes
1495          */
1496         if (xfs_sb_version_hasquota(&mp->m_sb)) {
1497                 if (XFS_IS_UQUOTA_ON(mp) &&
1498                     mp->m_sb.sb_uquotino != NULLFSINO) {
1499                         ASSERT(mp->m_sb.sb_uquotino > 0);
1500                         error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1501                                              0, 0, &uip);
1502                         if (error)
1503                                 return error;
1504                 }
1505                 if (XFS_IS_GQUOTA_ON(mp) &&
1506                     mp->m_sb.sb_gquotino != NULLFSINO) {
1507                         ASSERT(mp->m_sb.sb_gquotino > 0);
1508                         error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1509                                              0, 0, &gip);
1510                         if (error)
1511                                 goto error_rele;
1512                 }
1513                 if (XFS_IS_PQUOTA_ON(mp) &&
1514                     mp->m_sb.sb_pquotino != NULLFSINO) {
1515                         ASSERT(mp->m_sb.sb_pquotino > 0);
1516                         error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1517                                              0, 0, &pip);
1518                         if (error)
1519                                 goto error_rele;
1520                 }
1521         } else {
1522                 flags |= XFS_QMOPT_SBVERSION;
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                                               flags | XFS_QMOPT_UQUOTA);
1534                 if (error)
1535                         goto error_rele;
1536
1537                 flags &= ~XFS_QMOPT_SBVERSION;
1538         }
1539         if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1540                 error = xfs_qm_qino_alloc(mp, &gip,
1541                                           flags | XFS_QMOPT_GQUOTA);
1542                 if (error)
1543                         goto error_rele;
1544
1545                 flags &= ~XFS_QMOPT_SBVERSION;
1546         }
1547         if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1548                 error = xfs_qm_qino_alloc(mp, &pip,
1549                                           flags | XFS_QMOPT_PQUOTA);
1550                 if (error)
1551                         goto error_rele;
1552         }
1553
1554         mp->m_quotainfo->qi_uquotaip = uip;
1555         mp->m_quotainfo->qi_gquotaip = gip;
1556         mp->m_quotainfo->qi_pquotaip = pip;
1557
1558         return 0;
1559
1560 error_rele:
1561         if (uip)
1562                 IRELE(uip);
1563         if (gip)
1564                 IRELE(gip);
1565         if (pip)
1566                 IRELE(pip);
1567         return error;
1568 }
1569
1570 STATIC void
1571 xfs_qm_dqfree_one(
1572         struct xfs_dquot        *dqp)
1573 {
1574         struct xfs_mount        *mp = dqp->q_mount;
1575         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1576
1577         mutex_lock(&qi->qi_tree_lock);
1578         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1579                           be32_to_cpu(dqp->q_core.d_id));
1580
1581         qi->qi_dquots--;
1582         mutex_unlock(&qi->qi_tree_lock);
1583
1584         xfs_qm_dqdestroy(dqp);
1585 }
1586
1587 /* --------------- utility functions for vnodeops ---------------- */
1588
1589
1590 /*
1591  * Given an inode, a uid, gid and prid make sure that we have
1592  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1593  * quotas by creating this file.
1594  * This also attaches dquot(s) to the given inode after locking it,
1595  * and returns the dquots corresponding to the uid and/or gid.
1596  *
1597  * in   : inode (unlocked)
1598  * out  : udquot, gdquot with references taken and unlocked
1599  */
1600 int
1601 xfs_qm_vop_dqalloc(
1602         struct xfs_inode        *ip,
1603         xfs_dqid_t              uid,
1604         xfs_dqid_t              gid,
1605         prid_t                  prid,
1606         uint                    flags,
1607         struct xfs_dquot        **O_udqpp,
1608         struct xfs_dquot        **O_gdqpp,
1609         struct xfs_dquot        **O_pdqpp)
1610 {
1611         struct xfs_mount        *mp = ip->i_mount;
1612         struct xfs_dquot        *uq = NULL;
1613         struct xfs_dquot        *gq = NULL;
1614         struct xfs_dquot        *pq = NULL;
1615         int                     error;
1616         uint                    lockflags;
1617
1618         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1619                 return 0;
1620
1621         lockflags = XFS_ILOCK_EXCL;
1622         xfs_ilock(ip, lockflags);
1623
1624         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1625                 gid = ip->i_d.di_gid;
1626
1627         /*
1628          * Attach the dquot(s) to this inode, doing a dquot allocation
1629          * if necessary. The dquot(s) will not be locked.
1630          */
1631         if (XFS_NOT_DQATTACHED(mp, ip)) {
1632                 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1633                 if (error) {
1634                         xfs_iunlock(ip, lockflags);
1635                         return error;
1636                 }
1637         }
1638
1639         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1640                 if (ip->i_d.di_uid != uid) {
1641                         /*
1642                          * What we need is the dquot that has this uid, and
1643                          * if we send the inode to dqget, the uid of the inode
1644                          * takes priority over what's sent in the uid argument.
1645                          * We must unlock inode here before calling dqget if
1646                          * we're not sending the inode, because otherwise
1647                          * we'll deadlock by doing trans_reserve while
1648                          * holding ilock.
1649                          */
1650                         xfs_iunlock(ip, lockflags);
1651                         error = xfs_qm_dqget(mp, NULL, uid,
1652                                                  XFS_DQ_USER,
1653                                                  XFS_QMOPT_DQALLOC |
1654                                                  XFS_QMOPT_DOWARN,
1655                                                  &uq);
1656                         if (error) {
1657                                 ASSERT(error != -ENOENT);
1658                                 return error;
1659                         }
1660                         /*
1661                          * Get the ilock in the right order.
1662                          */
1663                         xfs_dqunlock(uq);
1664                         lockflags = XFS_ILOCK_SHARED;
1665                         xfs_ilock(ip, lockflags);
1666                 } else {
1667                         /*
1668                          * Take an extra reference, because we'll return
1669                          * this to caller
1670                          */
1671                         ASSERT(ip->i_udquot);
1672                         uq = xfs_qm_dqhold(ip->i_udquot);
1673                 }
1674         }
1675         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1676                 if (ip->i_d.di_gid != gid) {
1677                         xfs_iunlock(ip, lockflags);
1678                         error = xfs_qm_dqget(mp, NULL, gid,
1679                                                  XFS_DQ_GROUP,
1680                                                  XFS_QMOPT_DQALLOC |
1681                                                  XFS_QMOPT_DOWARN,
1682                                                  &gq);
1683                         if (error) {
1684                                 ASSERT(error != -ENOENT);
1685                                 goto error_rele;
1686                         }
1687                         xfs_dqunlock(gq);
1688                         lockflags = XFS_ILOCK_SHARED;
1689                         xfs_ilock(ip, lockflags);
1690                 } else {
1691                         ASSERT(ip->i_gdquot);
1692                         gq = xfs_qm_dqhold(ip->i_gdquot);
1693                 }
1694         }
1695         if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1696                 if (xfs_get_projid(ip) != prid) {
1697                         xfs_iunlock(ip, lockflags);
1698                         error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1699                                                  XFS_DQ_PROJ,
1700                                                  XFS_QMOPT_DQALLOC |
1701                                                  XFS_QMOPT_DOWARN,
1702                                                  &pq);
1703                         if (error) {
1704                                 ASSERT(error != -ENOENT);
1705                                 goto error_rele;
1706                         }
1707                         xfs_dqunlock(pq);
1708                         lockflags = XFS_ILOCK_SHARED;
1709                         xfs_ilock(ip, lockflags);
1710                 } else {
1711                         ASSERT(ip->i_pdquot);
1712                         pq = xfs_qm_dqhold(ip->i_pdquot);
1713                 }
1714         }
1715         if (uq)
1716                 trace_xfs_dquot_dqalloc(ip);
1717
1718         xfs_iunlock(ip, lockflags);
1719         if (O_udqpp)
1720                 *O_udqpp = uq;
1721         else
1722                 xfs_qm_dqrele(uq);
1723         if (O_gdqpp)
1724                 *O_gdqpp = gq;
1725         else
1726                 xfs_qm_dqrele(gq);
1727         if (O_pdqpp)
1728                 *O_pdqpp = pq;
1729         else
1730                 xfs_qm_dqrele(pq);
1731         return 0;
1732
1733 error_rele:
1734         xfs_qm_dqrele(gq);
1735         xfs_qm_dqrele(uq);
1736         return error;
1737 }
1738
1739 /*
1740  * Actually transfer ownership, and do dquot modifications.
1741  * These were already reserved.
1742  */
1743 xfs_dquot_t *
1744 xfs_qm_vop_chown(
1745         xfs_trans_t     *tp,
1746         xfs_inode_t     *ip,
1747         xfs_dquot_t     **IO_olddq,
1748         xfs_dquot_t     *newdq)
1749 {
1750         xfs_dquot_t     *prevdq;
1751         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1752                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1753
1754
1755         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1756         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1757
1758         /* old dquot */
1759         prevdq = *IO_olddq;
1760         ASSERT(prevdq);
1761         ASSERT(prevdq != newdq);
1762
1763         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1764         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1765
1766         /* the sparkling new dquot */
1767         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1768         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1769
1770         /*
1771          * Take an extra reference, because the inode is going to keep
1772          * this dquot pointer even after the trans_commit.
1773          */
1774         *IO_olddq = xfs_qm_dqhold(newdq);
1775
1776         return prevdq;
1777 }
1778
1779 /*
1780  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1781  */
1782 int
1783 xfs_qm_vop_chown_reserve(
1784         struct xfs_trans        *tp,
1785         struct xfs_inode        *ip,
1786         struct xfs_dquot        *udqp,
1787         struct xfs_dquot        *gdqp,
1788         struct xfs_dquot        *pdqp,
1789         uint                    flags)
1790 {
1791         struct xfs_mount        *mp = ip->i_mount;
1792         uint                    delblks, blkflags, prjflags = 0;
1793         struct xfs_dquot        *udq_unres = NULL;
1794         struct xfs_dquot        *gdq_unres = NULL;
1795         struct xfs_dquot        *pdq_unres = NULL;
1796         struct xfs_dquot        *udq_delblks = NULL;
1797         struct xfs_dquot        *gdq_delblks = NULL;
1798         struct xfs_dquot        *pdq_delblks = NULL;
1799         int                     error;
1800
1801
1802         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1803         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1804
1805         delblks = ip->i_delayed_blks;
1806         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1807                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1808
1809         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1810             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1811                 udq_delblks = udqp;
1812                 /*
1813                  * If there are delayed allocation blocks, then we have to
1814                  * unreserve those from the old dquot, and add them to the
1815                  * new dquot.
1816                  */
1817                 if (delblks) {
1818                         ASSERT(ip->i_udquot);
1819                         udq_unres = ip->i_udquot;
1820                 }
1821         }
1822         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1823             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1824                 gdq_delblks = gdqp;
1825                 if (delblks) {
1826                         ASSERT(ip->i_gdquot);
1827                         gdq_unres = ip->i_gdquot;
1828                 }
1829         }
1830
1831         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1832             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1833                 prjflags = XFS_QMOPT_ENOSPC;
1834                 pdq_delblks = pdqp;
1835                 if (delblks) {
1836                         ASSERT(ip->i_pdquot);
1837                         pdq_unres = ip->i_pdquot;
1838                 }
1839         }
1840
1841         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1842                                 udq_delblks, gdq_delblks, pdq_delblks,
1843                                 ip->i_d.di_nblocks, 1,
1844                                 flags | blkflags | prjflags);
1845         if (error)
1846                 return error;
1847
1848         /*
1849          * Do the delayed blks reservations/unreservations now. Since, these
1850          * are done without the help of a transaction, if a reservation fails
1851          * its previous reservations won't be automatically undone by trans
1852          * code. So, we have to do it manually here.
1853          */
1854         if (delblks) {
1855                 /*
1856                  * Do the reservations first. Unreservation can't fail.
1857                  */
1858                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1859                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1860                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1861                             udq_delblks, gdq_delblks, pdq_delblks,
1862                             (xfs_qcnt_t)delblks, 0,
1863                             flags | blkflags | prjflags);
1864                 if (error)
1865                         return error;
1866                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1867                                 udq_unres, gdq_unres, pdq_unres,
1868                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1869         }
1870
1871         return 0;
1872 }
1873
1874 int
1875 xfs_qm_vop_rename_dqattach(
1876         struct xfs_inode        **i_tab)
1877 {
1878         struct xfs_mount        *mp = i_tab[0]->i_mount;
1879         int                     i;
1880
1881         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1882                 return 0;
1883
1884         for (i = 0; (i < 4 && i_tab[i]); i++) {
1885                 struct xfs_inode        *ip = i_tab[i];
1886                 int                     error;
1887
1888                 /*
1889                  * Watch out for duplicate entries in the table.
1890                  */
1891                 if (i == 0 || ip != i_tab[i-1]) {
1892                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1893                                 error = xfs_qm_dqattach(ip, 0);
1894                                 if (error)
1895                                         return error;
1896                         }
1897                 }
1898         }
1899         return 0;
1900 }
1901
1902 void
1903 xfs_qm_vop_create_dqattach(
1904         struct xfs_trans        *tp,
1905         struct xfs_inode        *ip,
1906         struct xfs_dquot        *udqp,
1907         struct xfs_dquot        *gdqp,
1908         struct xfs_dquot        *pdqp)
1909 {
1910         struct xfs_mount        *mp = tp->t_mountp;
1911
1912         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1913                 return;
1914
1915         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1916         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1917
1918         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1919                 ASSERT(ip->i_udquot == NULL);
1920                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1921
1922                 ip->i_udquot = xfs_qm_dqhold(udqp);
1923                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1924         }
1925         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1926                 ASSERT(ip->i_gdquot == NULL);
1927                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1928                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1929                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1930         }
1931         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1932                 ASSERT(ip->i_pdquot == NULL);
1933                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1934
1935                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1936                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1937         }
1938 }
1939