fs/xfs/xfs

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This source file includes following definitions.
xfs_qm_dquot_walk
xfs_qm_dqpurge
xfs_qm_dqpurge_all
xfs_qm_unmount
xfs_qm_unmount_quotas
xfs_qm_dqattach_one
xfs_qm_need_dqattach
xfs_qm_dqattach_locked
xfs_qm_dqattach
xfs_qm_dqdetach
xfs_qm_dquot_isolate
xfs_qm_shrink_scan
xfs_qm_shrink_count
xfs_qm_set_defquota
xfs_qm_init_timelimits
xfs_qm_init_quotainfo
xfs_qm_destroy_quotainfo
xfs_qm_qino_alloc
xfs_qm_reset_dqcounts
xfs_qm_reset_dqcounts_all
xfs_qm_reset_dqcounts_buf
xfs_qm_quotacheck_dqadjust
xfs_qm_dqusage_adjust
xfs_qm_flush_one
xfs_qm_quotacheck
xfs_qm_mount_quotas
xfs_qm_init_quotainos
xfs_qm_destroy_quotainos
xfs_qm_dqfree_one
xfs_qm_vop_dqalloc
xfs_qm_vop_chown
xfs_qm_vop_chown_reserve
xfs_qm_vop_rename_dqattach
xfs_qm_vop_create_dqattach
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_bit.h"
  13 #include "xfs_sb.h"
  14 #include "xfs_mount.h"
  15 #include "xfs_inode.h"
  16 #include "xfs_iwalk.h"
  17 #include "xfs_quota.h"
  18 #include "xfs_bmap.h"
  19 #include "xfs_bmap_util.h"
  20 #include "xfs_trans.h"
  21 #include "xfs_trans_space.h"
  22 #include "xfs_qm.h"
  23 #include "xfs_trace.h"
  24 #include "xfs_icache.h"
  25 
  26 /*
  27  * The global quota manager. There is only one of these for the entire
  28  * system, _not_ one per file system. XQM keeps track of the overall
  29  * quota functionality, including maintaining the freelist and hash
  30  * tables of dquots.
  31  */
  32 STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  33 STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  34 
  35 STATIC void     xfs_qm_destroy_quotainos(xfs_quotainfo_t *qi);
  36 STATIC void     xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  37 /*
  38  * We use the batch lookup interface to iterate over the dquots as it
  39  * currently is the only interface into the radix tree code that allows
  40  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  41  * operations is fine as all callers are used either during mount/umount
  42  * or quotaoff.
  43  */
  44 #define XFS_DQ_LOOKUP_BATCH     32
  45 
  46 STATIC int
  47 xfs_qm_dquot_walk(
  48         struct xfs_mount        *mp,
  49         int                     type,
  50         int                     (*execute)(struct xfs_dquot *dqp, void *data),
  51         void                    *data)
  52 {
  53         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  54         struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  55         uint32_t                next_index;
  56         int                     last_error = 0;
  57         int                     skipped;
  58         int                     nr_found;
  59 
  60 restart:
  61         skipped = 0;
  62         next_index = 0;
  63         nr_found = 0;
  64 
  65         while (1) {
  66                 struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  67                 int             error = 0;
  68                 int             i;
  69 
  70                 mutex_lock(&qi->qi_tree_lock);
  71                 nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  72                                         next_index, XFS_DQ_LOOKUP_BATCH);
  73                 if (!nr_found) {
  74                         mutex_unlock(&qi->qi_tree_lock);
  75                         break;
  76                 }
  77 
  78                 for (i = 0; i < nr_found; i++) {
  79                         struct xfs_dquot *dqp = batch[i];
  80 
  81                         next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  82 
  83                         error = execute(batch[i], data);
  84                         if (error == -EAGAIN) {
  85                                 skipped++;
  86                                 continue;
  87                         }
  88                         if (error && last_error != -EFSCORRUPTED)
  89                                 last_error = error;
  90                 }
  91 
  92                 mutex_unlock(&qi->qi_tree_lock);
  93 
  94                 /* bail out if the filesystem is corrupted.  */
  95                 if (last_error == -EFSCORRUPTED) {
  96                         skipped = 0;
  97                         break;
  98                 }
  99                 /* we're done if id overflows back to zero */
 100                 if (!next_index)
 101                         break;
 102         }
 103 
 104         if (skipped) {
 105                 delay(1);
 106                 goto restart;
 107         }
 108 
 109         return last_error;
 110 }
 111 
 112 
 113 /*
 114  * Purge a dquot from all tracking data structures and free it.
 115  */
 116 STATIC int
 117 xfs_qm_dqpurge(
 118         struct xfs_dquot        *dqp,
 119         void                    *data)
 120 {
 121         struct xfs_mount        *mp = dqp->q_mount;
 122         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 123 
 124         xfs_dqlock(dqp);
 125         if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 126                 xfs_dqunlock(dqp);
 127                 return -EAGAIN;
 128         }
 129 
 130         dqp->dq_flags |= XFS_DQ_FREEING;
 131 
 132         xfs_dqflock(dqp);
 133 
 134         /*
 135          * If we are turning this type of quotas off, we don't care
 136          * about the dirty metadata sitting in this dquot. OTOH, if
 137          * we're unmounting, we do care, so we flush it and wait.
 138          */
 139         if (XFS_DQ_IS_DIRTY(dqp)) {
 140                 struct xfs_buf  *bp = NULL;
 141                 int             error;
 142 
 143                 /*
 144                  * We don't care about getting disk errors here. We need
 145                  * to purge this dquot anyway, so we go ahead regardless.
 146                  */
 147                 error = xfs_qm_dqflush(dqp, &bp);
 148                 if (!error) {
 149                         error = xfs_bwrite(bp);
 150                         xfs_buf_relse(bp);
 151                 }
 152                 xfs_dqflock(dqp);
 153         }
 154 
 155         ASSERT(atomic_read(&dqp->q_pincount) == 0);
 156         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 157                 !test_bit(XFS_LI_IN_AIL, &dqp->q_logitem.qli_item.li_flags));
 158 
 159         xfs_dqfunlock(dqp);
 160         xfs_dqunlock(dqp);
 161 
 162         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 163                           be32_to_cpu(dqp->q_core.d_id));
 164         qi->qi_dquots--;
 165 
 166         /*
 167          * We move dquots to the freelist as soon as their reference count
 168          * hits zero, so it really should be on the freelist here.
 169          */
 170         ASSERT(!list_empty(&dqp->q_lru));
 171         list_lru_del(&qi->qi_lru, &dqp->q_lru);
 172         XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 173 
 174         xfs_qm_dqdestroy(dqp);
 175         return 0;
 176 }
 177 
 178 /*
 179  * Purge the dquot cache.
 180  */
 181 void
 182 xfs_qm_dqpurge_all(
 183         struct xfs_mount        *mp,
 184         uint                    flags)
 185 {
 186         if (flags & XFS_QMOPT_UQUOTA)
 187                 xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 188         if (flags & XFS_QMOPT_GQUOTA)
 189                 xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 190         if (flags & XFS_QMOPT_PQUOTA)
 191                 xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 192 }
 193 
 194 /*
 195  * Just destroy the quotainfo structure.
 196  */
 197 void
 198 xfs_qm_unmount(
 199         struct xfs_mount        *mp)
 200 {
 201         if (mp->m_quotainfo) {
 202                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 203                 xfs_qm_destroy_quotainfo(mp);
 204         }
 205 }
 206 
 207 /*
 208  * Called from the vfsops layer.
 209  */
 210 void
 211 xfs_qm_unmount_quotas(
 212         xfs_mount_t     *mp)
 213 {
 214         /*
 215          * Release the dquots that root inode, et al might be holding,
 216          * before we flush quotas and blow away the quotainfo structure.
 217          */
 218         ASSERT(mp->m_rootip);
 219         xfs_qm_dqdetach(mp->m_rootip);
 220         if (mp->m_rbmip)
 221                 xfs_qm_dqdetach(mp->m_rbmip);
 222         if (mp->m_rsumip)
 223                 xfs_qm_dqdetach(mp->m_rsumip);
 224 
 225         /*
 226          * Release the quota inodes.
 227          */
 228         if (mp->m_quotainfo) {
 229                 if (mp->m_quotainfo->qi_uquotaip) {
 230                         xfs_irele(mp->m_quotainfo->qi_uquotaip);
 231                         mp->m_quotainfo->qi_uquotaip = NULL;
 232                 }
 233                 if (mp->m_quotainfo->qi_gquotaip) {
 234                         xfs_irele(mp->m_quotainfo->qi_gquotaip);
 235                         mp->m_quotainfo->qi_gquotaip = NULL;
 236                 }
 237                 if (mp->m_quotainfo->qi_pquotaip) {
 238                         xfs_irele(mp->m_quotainfo->qi_pquotaip);
 239                         mp->m_quotainfo->qi_pquotaip = NULL;
 240                 }
 241         }
 242 }
 243 
 244 STATIC int
 245 xfs_qm_dqattach_one(
 246         xfs_inode_t     *ip,
 247         xfs_dqid_t      id,
 248         uint            type,
 249         bool            doalloc,
 250         xfs_dquot_t     **IO_idqpp)
 251 {
 252         xfs_dquot_t     *dqp;
 253         int             error;
 254 
 255         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 256         error = 0;
 257 
 258         /*
 259          * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 260          * or &i_gdquot. This made the code look weird, but made the logic a lot
 261          * simpler.
 262          */
 263         dqp = *IO_idqpp;
 264         if (dqp) {
 265                 trace_xfs_dqattach_found(dqp);
 266                 return 0;
 267         }
 268 
 269         /*
 270          * Find the dquot from somewhere. This bumps the reference count of
 271          * dquot and returns it locked.  This can return ENOENT if dquot didn't
 272          * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 273          * turned off suddenly.
 274          */
 275         error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
 276         if (error)
 277                 return error;
 278 
 279         trace_xfs_dqattach_get(dqp);
 280 
 281         /*
 282          * dqget may have dropped and re-acquired the ilock, but it guarantees
 283          * that the dquot returned is the one that should go in the inode.
 284          */
 285         *IO_idqpp = dqp;
 286         xfs_dqunlock(dqp);
 287         return 0;
 288 }
 289 
 290 static bool
 291 xfs_qm_need_dqattach(
 292         struct xfs_inode        *ip)
 293 {
 294         struct xfs_mount        *mp = ip->i_mount;
 295 
 296         if (!XFS_IS_QUOTA_RUNNING(mp))
 297                 return false;
 298         if (!XFS_IS_QUOTA_ON(mp))
 299                 return false;
 300         if (!XFS_NOT_DQATTACHED(mp, ip))
 301                 return false;
 302         if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 303                 return false;
 304         return true;
 305 }
 306 
 307 /*
 308  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 309  * into account.
 310  * If @doalloc is true, the dquot(s) will be allocated if needed.
 311  * Inode may get unlocked and relocked in here, and the caller must deal with
 312  * the consequences.
 313  */
 314 int
 315 xfs_qm_dqattach_locked(
 316         xfs_inode_t     *ip,
 317         bool            doalloc)
 318 {
 319         xfs_mount_t     *mp = ip->i_mount;
 320         int             error = 0;
 321 
 322         if (!xfs_qm_need_dqattach(ip))
 323                 return 0;
 324 
 325         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 326 
 327         if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 328                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 329                                 doalloc, &ip->i_udquot);
 330                 if (error)
 331                         goto done;
 332                 ASSERT(ip->i_udquot);
 333         }
 334 
 335         if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 336                 error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 337                                 doalloc, &ip->i_gdquot);
 338                 if (error)
 339                         goto done;
 340                 ASSERT(ip->i_gdquot);
 341         }
 342 
 343         if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 344                 error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 345                                 doalloc, &ip->i_pdquot);
 346                 if (error)
 347                         goto done;
 348                 ASSERT(ip->i_pdquot);
 349         }
 350 
 351 done:
 352         /*
 353          * Don't worry about the dquots that we may have attached before any
 354          * error - they'll get detached later if it has not already been done.
 355          */
 356         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 357         return error;
 358 }
 359 
 360 int
 361 xfs_qm_dqattach(
 362         struct xfs_inode        *ip)
 363 {
 364         int                     error;
 365 
 366         if (!xfs_qm_need_dqattach(ip))
 367                 return 0;
 368 
 369         xfs_ilock(ip, XFS_ILOCK_EXCL);
 370         error = xfs_qm_dqattach_locked(ip, false);
 371         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 372 
 373         return error;
 374 }
 375 
 376 /*
 377  * Release dquots (and their references) if any.
 378  * The inode should be locked EXCL except when this's called by
 379  * xfs_ireclaim.
 380  */
 381 void
 382 xfs_qm_dqdetach(
 383         xfs_inode_t     *ip)
 384 {
 385         if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 386                 return;
 387 
 388         trace_xfs_dquot_dqdetach(ip);
 389 
 390         ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 391         if (ip->i_udquot) {
 392                 xfs_qm_dqrele(ip->i_udquot);
 393                 ip->i_udquot = NULL;
 394         }
 395         if (ip->i_gdquot) {
 396                 xfs_qm_dqrele(ip->i_gdquot);
 397                 ip->i_gdquot = NULL;
 398         }
 399         if (ip->i_pdquot) {
 400                 xfs_qm_dqrele(ip->i_pdquot);
 401                 ip->i_pdquot = NULL;
 402         }
 403 }
 404 
 405 struct xfs_qm_isolate {
 406         struct list_head        buffers;
 407         struct list_head        dispose;
 408 };
 409 
 410 static enum lru_status
 411 xfs_qm_dquot_isolate(
 412         struct list_head        *item,
 413         struct list_lru_one     *lru,
 414         spinlock_t              *lru_lock,
 415         void                    *arg)
 416                 __releases(lru_lock) __acquires(lru_lock)
 417 {
 418         struct xfs_dquot        *dqp = container_of(item,
 419                                                 struct xfs_dquot, q_lru);
 420         struct xfs_qm_isolate   *isol = arg;
 421 
 422         if (!xfs_dqlock_nowait(dqp))
 423                 goto out_miss_busy;
 424 
 425         /*
 426          * This dquot has acquired a reference in the meantime remove it from
 427          * the freelist and try again.
 428          */
 429         if (dqp->q_nrefs) {
 430                 xfs_dqunlock(dqp);
 431                 XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 432 
 433                 trace_xfs_dqreclaim_want(dqp);
 434                 list_lru_isolate(lru, &dqp->q_lru);
 435                 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 436                 return LRU_REMOVED;
 437         }
 438 
 439         /*
 440          * If the dquot is dirty, flush it. If it's already being flushed, just
 441          * skip it so there is time for the IO to complete before we try to
 442          * reclaim it again on the next LRU pass.
 443          */
 444         if (!xfs_dqflock_nowait(dqp)) {
 445                 xfs_dqunlock(dqp);
 446                 goto out_miss_busy;
 447         }
 448 
 449         if (XFS_DQ_IS_DIRTY(dqp)) {
 450                 struct xfs_buf  *bp = NULL;
 451                 int             error;
 452 
 453                 trace_xfs_dqreclaim_dirty(dqp);
 454 
 455                 /* we have to drop the LRU lock to flush the dquot */
 456                 spin_unlock(lru_lock);
 457 
 458                 error = xfs_qm_dqflush(dqp, &bp);
 459                 if (error)
 460                         goto out_unlock_dirty;
 461 
 462                 xfs_buf_delwri_queue(bp, &isol->buffers);
 463                 xfs_buf_relse(bp);
 464                 goto out_unlock_dirty;
 465         }
 466         xfs_dqfunlock(dqp);
 467 
 468         /*
 469          * Prevent lookups now that we are past the point of no return.
 470          */
 471         dqp->dq_flags |= XFS_DQ_FREEING;
 472         xfs_dqunlock(dqp);
 473 
 474         ASSERT(dqp->q_nrefs == 0);
 475         list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 476         XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 477         trace_xfs_dqreclaim_done(dqp);
 478         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 479         return LRU_REMOVED;
 480 
 481 out_miss_busy:
 482         trace_xfs_dqreclaim_busy(dqp);
 483         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 484         return LRU_SKIP;
 485 
 486 out_unlock_dirty:
 487         trace_xfs_dqreclaim_busy(dqp);
 488         XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 489         xfs_dqunlock(dqp);
 490         spin_lock(lru_lock);
 491         return LRU_RETRY;
 492 }
 493 
 494 static unsigned long
 495 xfs_qm_shrink_scan(
 496         struct shrinker         *shrink,
 497         struct shrink_control   *sc)
 498 {
 499         struct xfs_quotainfo    *qi = container_of(shrink,
 500                                         struct xfs_quotainfo, qi_shrinker);
 501         struct xfs_qm_isolate   isol;
 502         unsigned long           freed;
 503         int                     error;
 504 
 505         if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 506                 return 0;
 507 
 508         INIT_LIST_HEAD(&isol.buffers);
 509         INIT_LIST_HEAD(&isol.dispose);
 510 
 511         freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 512                                      xfs_qm_dquot_isolate, &isol);
 513 
 514         error = xfs_buf_delwri_submit(&isol.buffers);
 515         if (error)
 516                 xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 517 
 518         while (!list_empty(&isol.dispose)) {
 519                 struct xfs_dquot        *dqp;
 520 
 521                 dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 522                 list_del_init(&dqp->q_lru);
 523                 xfs_qm_dqfree_one(dqp);
 524         }
 525 
 526         return freed;
 527 }
 528 
 529 static unsigned long
 530 xfs_qm_shrink_count(
 531         struct shrinker         *shrink,
 532         struct shrink_control   *sc)
 533 {
 534         struct xfs_quotainfo    *qi = container_of(shrink,
 535                                         struct xfs_quotainfo, qi_shrinker);
 536 
 537         return list_lru_shrink_count(&qi->qi_lru, sc);
 538 }
 539 
 540 STATIC void
 541 xfs_qm_set_defquota(
 542         xfs_mount_t     *mp,
 543         uint            type,
 544         xfs_quotainfo_t *qinf)
 545 {
 546         xfs_dquot_t             *dqp;
 547         struct xfs_def_quota    *defq;
 548         struct xfs_disk_dquot   *ddqp;
 549         int                     error;
 550 
 551         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 552         if (error)
 553                 return;
 554 
 555         ddqp = &dqp->q_core;
 556         defq = xfs_get_defquota(dqp, qinf);
 557 
 558         /*
 559          * Timers and warnings have been already set, let's just set the
 560          * default limits for this quota type
 561          */
 562         defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 563         defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 564         defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 565         defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 566         defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 567         defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 568         xfs_qm_dqdestroy(dqp);
 569 }
 570 
 571 /* Initialize quota time limits from the root dquot. */
 572 static void
 573 xfs_qm_init_timelimits(
 574         struct xfs_mount        *mp,
 575         struct xfs_quotainfo    *qinf)
 576 {
 577         struct xfs_disk_dquot   *ddqp;
 578         struct xfs_dquot        *dqp;
 579         uint                    type;
 580         int                     error;
 581 
 582         qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 583         qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 584         qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 585         qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 586         qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 587         qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 588 
 589         /*
 590          * We try to get the limits from the superuser's limits fields.
 591          * This is quite hacky, but it is standard quota practice.
 592          *
 593          * Since we may not have done a quotacheck by this point, just read
 594          * the dquot without attaching it to any hashtables or lists.
 595          *
 596          * Timers and warnings are globally set by the first timer found in
 597          * user/group/proj quota types, otherwise a default value is used.
 598          * This should be split into different fields per quota type.
 599          */
 600         if (XFS_IS_UQUOTA_RUNNING(mp))
 601                 type = XFS_DQ_USER;
 602         else if (XFS_IS_GQUOTA_RUNNING(mp))
 603                 type = XFS_DQ_GROUP;
 604         else
 605                 type = XFS_DQ_PROJ;
 606         error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
 607         if (error)
 608                 return;
 609 
 610         ddqp = &dqp->q_core;
 611         /*
 612          * The warnings and timers set the grace period given to
 613          * a user or group before he or she can not perform any
 614          * more writing. If it is zero, a default is used.
 615          */
 616         if (ddqp->d_btimer)
 617                 qinf->qi_btimelimit = be32_to_cpu(ddqp->d_btimer);
 618         if (ddqp->d_itimer)
 619                 qinf->qi_itimelimit = be32_to_cpu(ddqp->d_itimer);
 620         if (ddqp->d_rtbtimer)
 621                 qinf->qi_rtbtimelimit = be32_to_cpu(ddqp->d_rtbtimer);
 622         if (ddqp->d_bwarns)
 623                 qinf->qi_bwarnlimit = be16_to_cpu(ddqp->d_bwarns);
 624         if (ddqp->d_iwarns)
 625                 qinf->qi_iwarnlimit = be16_to_cpu(ddqp->d_iwarns);
 626         if (ddqp->d_rtbwarns)
 627                 qinf->qi_rtbwarnlimit = be16_to_cpu(ddqp->d_rtbwarns);
 628 
 629         xfs_qm_dqdestroy(dqp);
 630 }
 631 
 632 /*
 633  * This initializes all the quota information that's kept in the
 634  * mount structure
 635  */
 636 STATIC int
 637 xfs_qm_init_quotainfo(
 638         struct xfs_mount        *mp)
 639 {
 640         struct xfs_quotainfo    *qinf;
 641         int                     error;
 642 
 643         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 644 
 645         qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), 0);
 646 
 647         error = list_lru_init(&qinf->qi_lru);
 648         if (error)
 649                 goto out_free_qinf;
 650 
 651         /*
 652          * See if quotainodes are setup, and if not, allocate them,
 653          * and change the superblock accordingly.
 654          */
 655         error = xfs_qm_init_quotainos(mp);
 656         if (error)
 657                 goto out_free_lru;
 658 
 659         INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 660         INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 661         INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 662         mutex_init(&qinf->qi_tree_lock);
 663 
 664         /* mutex used to serialize quotaoffs */
 665         mutex_init(&qinf->qi_quotaofflock);
 666 
 667         /* Precalc some constants */
 668         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 669         qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 670 
 671         mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 672 
 673         xfs_qm_init_timelimits(mp, qinf);
 674 
 675         if (XFS_IS_UQUOTA_RUNNING(mp))
 676                 xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 677         if (XFS_IS_GQUOTA_RUNNING(mp))
 678                 xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 679         if (XFS_IS_PQUOTA_RUNNING(mp))
 680                 xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 681 
 682         qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 683         qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 684         qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 685         qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 686 
 687         error = register_shrinker(&qinf->qi_shrinker);
 688         if (error)
 689                 goto out_free_inos;
 690 
 691         return 0;
 692 
 693 out_free_inos:
 694         mutex_destroy(&qinf->qi_quotaofflock);
 695         mutex_destroy(&qinf->qi_tree_lock);
 696         xfs_qm_destroy_quotainos(qinf);
 697 out_free_lru:
 698         list_lru_destroy(&qinf->qi_lru);
 699 out_free_qinf:
 700         kmem_free(qinf);
 701         mp->m_quotainfo = NULL;
 702         return error;
 703 }
 704 
 705 /*
 706  * Gets called when unmounting a filesystem or when all quotas get
 707  * turned off.
 708  * This purges the quota inodes, destroys locks and frees itself.
 709  */
 710 void
 711 xfs_qm_destroy_quotainfo(
 712         xfs_mount_t     *mp)
 713 {
 714         xfs_quotainfo_t *qi;
 715 
 716         qi = mp->m_quotainfo;
 717         ASSERT(qi != NULL);
 718 
 719         unregister_shrinker(&qi->qi_shrinker);
 720         list_lru_destroy(&qi->qi_lru);
 721         xfs_qm_destroy_quotainos(qi);
 722         mutex_destroy(&qi->qi_tree_lock);
 723         mutex_destroy(&qi->qi_quotaofflock);
 724         kmem_free(qi);
 725         mp->m_quotainfo = NULL;
 726 }
 727 
 728 /*
 729  * Create an inode and return with a reference already taken, but unlocked
 730  * This is how we create quota inodes
 731  */
 732 STATIC int
 733 xfs_qm_qino_alloc(
 734         xfs_mount_t     *mp,
 735         xfs_inode_t     **ip,
 736         uint            flags)
 737 {
 738         xfs_trans_t     *tp;
 739         int             error;
 740         bool            need_alloc = true;
 741 
 742         *ip = NULL;
 743         /*
 744          * With superblock that doesn't have separate pquotino, we
 745          * share an inode between gquota and pquota. If the on-disk
 746          * superblock has GQUOTA and the filesystem is now mounted
 747          * with PQUOTA, just use sb_gquotino for sb_pquotino and
 748          * vice-versa.
 749          */
 750         if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 751                         (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 752                 xfs_ino_t ino = NULLFSINO;
 753 
 754                 if ((flags & XFS_QMOPT_PQUOTA) &&
 755                              (mp->m_sb.sb_gquotino != NULLFSINO)) {
 756                         ino = mp->m_sb.sb_gquotino;
 757                         ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 758                 } else if ((flags & XFS_QMOPT_GQUOTA) &&
 759                              (mp->m_sb.sb_pquotino != NULLFSINO)) {
 760                         ino = mp->m_sb.sb_pquotino;
 761                         ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 762                 }
 763                 if (ino != NULLFSINO) {
 764                         error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 765                         if (error)
 766                                 return error;
 767                         mp->m_sb.sb_gquotino = NULLFSINO;
 768                         mp->m_sb.sb_pquotino = NULLFSINO;
 769                         need_alloc = false;
 770                 }
 771         }
 772 
 773         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 774                         XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 775         if (error)
 776                 return error;
 777 
 778         if (need_alloc) {
 779                 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
 780                 if (error) {
 781                         xfs_trans_cancel(tp);
 782                         return error;
 783                 }
 784         }
 785 
 786         /*
 787          * Make the changes in the superblock, and log those too.
 788          * sbfields arg may contain fields other than *QUOTINO;
 789          * VERSIONNUM for example.
 790          */
 791         spin_lock(&mp->m_sb_lock);
 792         if (flags & XFS_QMOPT_SBVERSION) {
 793                 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 794 
 795                 xfs_sb_version_addquota(&mp->m_sb);
 796                 mp->m_sb.sb_uquotino = NULLFSINO;
 797                 mp->m_sb.sb_gquotino = NULLFSINO;
 798                 mp->m_sb.sb_pquotino = NULLFSINO;
 799 
 800                 /* qflags will get updated fully _after_ quotacheck */
 801                 mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 802         }
 803         if (flags & XFS_QMOPT_UQUOTA)
 804                 mp->m_sb.sb_uquotino = (*ip)->i_ino;
 805         else if (flags & XFS_QMOPT_GQUOTA)
 806                 mp->m_sb.sb_gquotino = (*ip)->i_ino;
 807         else
 808                 mp->m_sb.sb_pquotino = (*ip)->i_ino;
 809         spin_unlock(&mp->m_sb_lock);
 810         xfs_log_sb(tp);
 811 
 812         error = xfs_trans_commit(tp);
 813         if (error) {
 814                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
 815                 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 816         }
 817         if (need_alloc)
 818                 xfs_finish_inode_setup(*ip);
 819         return error;
 820 }
 821 
 822 
 823 STATIC void
 824 xfs_qm_reset_dqcounts(
 825         xfs_mount_t     *mp,
 826         xfs_buf_t       *bp,
 827         xfs_dqid_t      id,
 828         uint            type)
 829 {
 830         struct xfs_dqblk        *dqb;
 831         int                     j;
 832         xfs_failaddr_t          fa;
 833 
 834         trace_xfs_reset_dqcounts(bp, _RET_IP_);
 835 
 836         /*
 837          * Reset all counters and timers. They'll be
 838          * started afresh by xfs_qm_quotacheck.
 839          */
 840 #ifdef DEBUG
 841         j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 842                 sizeof(xfs_dqblk_t);
 843         ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 844 #endif
 845         dqb = bp->b_addr;
 846         for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 847                 struct xfs_disk_dquot   *ddq;
 848 
 849                 ddq = (struct xfs_disk_dquot *)&dqb[j];
 850 
 851                 /*
 852                  * Do a sanity check, and if needed, repair the dqblk. Don't
 853                  * output any warnings because it's perfectly possible to
 854                  * find uninitialised dquot blks. See comment in
 855                  * xfs_dquot_verify.
 856                  */
 857                 fa = xfs_dqblk_verify(mp, &dqb[j], id + j, type);
 858                 if (fa)
 859                         xfs_dqblk_repair(mp, &dqb[j], id + j, type);
 860 
 861                 /*
 862                  * Reset type in case we are reusing group quota file for
 863                  * project quotas or vice versa
 864                  */
 865                 ddq->d_flags = type;
 866                 ddq->d_bcount = 0;
 867                 ddq->d_icount = 0;
 868                 ddq->d_rtbcount = 0;
 869                 ddq->d_btimer = 0;
 870                 ddq->d_itimer = 0;
 871                 ddq->d_rtbtimer = 0;
 872                 ddq->d_bwarns = 0;
 873                 ddq->d_iwarns = 0;
 874                 ddq->d_rtbwarns = 0;
 875 
 876                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 877                         xfs_update_cksum((char *)&dqb[j],
 878                                          sizeof(struct xfs_dqblk),
 879                                          XFS_DQUOT_CRC_OFF);
 880                 }
 881         }
 882 }
 883 
 884 STATIC int
 885 xfs_qm_reset_dqcounts_all(
 886         struct xfs_mount        *mp,
 887         xfs_dqid_t              firstid,
 888         xfs_fsblock_t           bno,
 889         xfs_filblks_t           blkcnt,
 890         uint                    flags,
 891         struct list_head        *buffer_list)
 892 {
 893         struct xfs_buf          *bp;
 894         int                     error;
 895         int                     type;
 896 
 897         ASSERT(blkcnt > 0);
 898         type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 899                 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 900         error = 0;
 901 
 902         /*
 903          * Blkcnt arg can be a very big number, and might even be
 904          * larger than the log itself. So, we have to break it up into
 905          * manageable-sized transactions.
 906          * Note that we don't start a permanent transaction here; we might
 907          * not be able to get a log reservation for the whole thing up front,
 908          * and we don't really care to either, because we just discard
 909          * everything if we were to crash in the middle of this loop.
 910          */
 911         while (blkcnt--) {
 912                 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 913                               XFS_FSB_TO_DADDR(mp, bno),
 914                               mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 915                               &xfs_dquot_buf_ops);
 916 
 917                 /*
 918                  * CRC and validation errors will return a EFSCORRUPTED here. If
 919                  * this occurs, re-read without CRC validation so that we can
 920                  * repair the damage via xfs_qm_reset_dqcounts(). This process
 921                  * will leave a trace in the log indicating corruption has
 922                  * been detected.
 923                  */
 924                 if (error == -EFSCORRUPTED) {
 925                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 926                                       XFS_FSB_TO_DADDR(mp, bno),
 927                                       mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 928                                       NULL);
 929                 }
 930 
 931                 if (error)
 932                         break;
 933 
 934                 /*
 935                  * A corrupt buffer might not have a verifier attached, so
 936                  * make sure we have the correct one attached before writeback
 937                  * occurs.
 938                  */
 939                 bp->b_ops = &xfs_dquot_buf_ops;
 940                 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 941                 xfs_buf_delwri_queue(bp, buffer_list);
 942                 xfs_buf_relse(bp);
 943 
 944                 /* goto the next block. */
 945                 bno++;
 946                 firstid += mp->m_quotainfo->qi_dqperchunk;
 947         }
 948 
 949         return error;
 950 }
 951 
 952 /*
 953  * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 954  * counters for every chunk of dquots that we find.
 955  */
 956 STATIC int
 957 xfs_qm_reset_dqcounts_buf(
 958         struct xfs_mount        *mp,
 959         struct xfs_inode        *qip,
 960         uint                    flags,
 961         struct list_head        *buffer_list)
 962 {
 963         struct xfs_bmbt_irec    *map;
 964         int                     i, nmaps;       /* number of map entries */
 965         int                     error;          /* return value */
 966         xfs_fileoff_t           lblkno;
 967         xfs_filblks_t           maxlblkcnt;
 968         xfs_dqid_t              firstid;
 969         xfs_fsblock_t           rablkno;
 970         xfs_filblks_t           rablkcnt;
 971 
 972         error = 0;
 973         /*
 974          * This looks racy, but we can't keep an inode lock across a
 975          * trans_reserve. But, this gets called during quotacheck, and that
 976          * happens only at mount time which is single threaded.
 977          */
 978         if (qip->i_d.di_nblocks == 0)
 979                 return 0;
 980 
 981         map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
 982 
 983         lblkno = 0;
 984         maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 985         do {
 986                 uint            lock_mode;
 987 
 988                 nmaps = XFS_DQITER_MAP_SIZE;
 989                 /*
 990                  * We aren't changing the inode itself. Just changing
 991                  * some of its data. No new blocks are added here, and
 992                  * the inode is never added to the transaction.
 993                  */
 994                 lock_mode = xfs_ilock_data_map_shared(qip);
 995                 error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 996                                        map, &nmaps, 0);
 997                 xfs_iunlock(qip, lock_mode);
 998                 if (error)
 999                         break;
1000 
1001                 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1002                 for (i = 0; i < nmaps; i++) {
1003                         ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1004                         ASSERT(map[i].br_blockcount);
1005 
1006 
1007                         lblkno += map[i].br_blockcount;
1008 
1009                         if (map[i].br_startblock == HOLESTARTBLOCK)
1010                                 continue;
1011 
1012                         firstid = (xfs_dqid_t) map[i].br_startoff *
1013                                 mp->m_quotainfo->qi_dqperchunk;
1014                         /*
1015                          * Do a read-ahead on the next extent.
1016                          */
1017                         if ((i+1 < nmaps) &&
1018                             (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1019                                 rablkcnt =  map[i+1].br_blockcount;
1020                                 rablkno = map[i+1].br_startblock;
1021                                 while (rablkcnt--) {
1022                                         xfs_buf_readahead(mp->m_ddev_targp,
1023                                                XFS_FSB_TO_DADDR(mp, rablkno),
1024                                                mp->m_quotainfo->qi_dqchunklen,
1025                                                &xfs_dquot_buf_ops);
1026                                         rablkno++;
1027                                 }
1028                         }
1029                         /*
1030                          * Iterate thru all the blks in the extent and
1031                          * reset the counters of all the dquots inside them.
1032                          */
1033                         error = xfs_qm_reset_dqcounts_all(mp, firstid,
1034                                                    map[i].br_startblock,
1035                                                    map[i].br_blockcount,
1036                                                    flags, buffer_list);
1037                         if (error)
1038                                 goto out;
1039                 }
1040         } while (nmaps > 0);
1041 
1042 out:
1043         kmem_free(map);
1044         return error;
1045 }
1046 
1047 /*
1048  * Called by dqusage_adjust in doing a quotacheck.
1049  *
1050  * Given the inode, and a dquot id this updates both the incore dqout as well
1051  * as the buffer copy. This is so that once the quotacheck is done, we can
1052  * just log all the buffers, as opposed to logging numerous updates to
1053  * individual dquots.
1054  */
1055 STATIC int
1056 xfs_qm_quotacheck_dqadjust(
1057         struct xfs_inode        *ip,
1058         uint                    type,
1059         xfs_qcnt_t              nblks,
1060         xfs_qcnt_t              rtblks)
1061 {
1062         struct xfs_mount        *mp = ip->i_mount;
1063         struct xfs_dquot        *dqp;
1064         xfs_dqid_t              id;
1065         int                     error;
1066 
1067         id = xfs_qm_id_for_quotatype(ip, type);
1068         error = xfs_qm_dqget(mp, id, type, true, &dqp);
1069         if (error) {
1070                 /*
1071                  * Shouldn't be able to turn off quotas here.
1072                  */
1073                 ASSERT(error != -ESRCH);
1074                 ASSERT(error != -ENOENT);
1075                 return error;
1076         }
1077 
1078         trace_xfs_dqadjust(dqp);
1079 
1080         /*
1081          * Adjust the inode count and the block count to reflect this inode's
1082          * resource usage.
1083          */
1084         be64_add_cpu(&dqp->q_core.d_icount, 1);
1085         dqp->q_res_icount++;
1086         if (nblks) {
1087                 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1088                 dqp->q_res_bcount += nblks;
1089         }
1090         if (rtblks) {
1091                 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1092                 dqp->q_res_rtbcount += rtblks;
1093         }
1094 
1095         /*
1096          * Set default limits, adjust timers (since we changed usages)
1097          *
1098          * There are no timers for the default values set in the root dquot.
1099          */
1100         if (dqp->q_core.d_id) {
1101                 xfs_qm_adjust_dqlimits(mp, dqp);
1102                 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1103         }
1104 
1105         dqp->dq_flags |= XFS_DQ_DIRTY;
1106         xfs_qm_dqput(dqp);
1107         return 0;
1108 }
1109 
1110 /*
1111  * callback routine supplied to bulkstat(). Given an inumber, find its
1112  * dquots and update them to account for resources taken by that inode.
1113  */
1114 /* ARGSUSED */
1115 STATIC int
1116 xfs_qm_dqusage_adjust(
1117         struct xfs_mount        *mp,
1118         struct xfs_trans        *tp,
1119         xfs_ino_t               ino,
1120         void                    *data)
1121 {
1122         struct xfs_inode        *ip;
1123         xfs_qcnt_t              nblks;
1124         xfs_filblks_t           rtblks = 0;     /* total rt blks */
1125         int                     error;
1126 
1127         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1128 
1129         /*
1130          * rootino must have its resources accounted for, not so with the quota
1131          * inodes.
1132          */
1133         if (xfs_is_quota_inode(&mp->m_sb, ino))
1134                 return 0;
1135 
1136         /*
1137          * We don't _need_ to take the ilock EXCL here because quotacheck runs
1138          * at mount time and therefore nobody will be racing chown/chproj.
1139          */
1140         error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
1141         if (error == -EINVAL || error == -ENOENT)
1142                 return 0;
1143         if (error)
1144                 return error;
1145 
1146         ASSERT(ip->i_delayed_blks == 0);
1147 
1148         if (XFS_IS_REALTIME_INODE(ip)) {
1149                 struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1150 
1151                 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1152                         error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1153                         if (error)
1154                                 goto error0;
1155                 }
1156 
1157                 xfs_bmap_count_leaves(ifp, &rtblks);
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, XFS_DQ_USER, nblks,
1176                                 rtblks);
1177                 if (error)
1178                         goto error0;
1179         }
1180 
1181         if (XFS_IS_GQUOTA_ON(mp)) {
1182                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_GROUP, nblks,
1183                                 rtblks);
1184                 if (error)
1185                         goto error0;
1186         }
1187 
1188         if (XFS_IS_PQUOTA_ON(mp)) {
1189                 error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQ_PROJ, nblks,
1190                                 rtblks);
1191                 if (error)
1192                         goto error0;
1193         }
1194 
1195 error0:
1196         xfs_irele(ip);
1197         return error;
1198 }
1199 
1200 STATIC int
1201 xfs_qm_flush_one(
1202         struct xfs_dquot        *dqp,
1203         void                    *data)
1204 {
1205         struct xfs_mount        *mp = dqp->q_mount;
1206         struct list_head        *buffer_list = data;
1207         struct xfs_buf          *bp = NULL;
1208         int                     error = 0;
1209 
1210         xfs_dqlock(dqp);
1211         if (dqp->dq_flags & XFS_DQ_FREEING)
1212                 goto out_unlock;
1213         if (!XFS_DQ_IS_DIRTY(dqp))
1214                 goto out_unlock;
1215 
1216         /*
1217          * The only way the dquot is already flush locked by the time quotacheck
1218          * gets here is if reclaim flushed it before the dqadjust walk dirtied
1219          * it for the final time. Quotacheck collects all dquot bufs in the
1220          * local delwri queue before dquots are dirtied, so reclaim can't have
1221          * possibly queued it for I/O. The only way out is to push the buffer to
1222          * cycle the flush lock.
1223          */
1224         if (!xfs_dqflock_nowait(dqp)) {
1225                 /* buf is pinned in-core by delwri list */
1226                 bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
1227                                 mp->m_quotainfo->qi_dqchunklen, 0);
1228                 if (!bp) {
1229                         error = -EINVAL;
1230                         goto out_unlock;
1231                 }
1232                 xfs_buf_unlock(bp);
1233 
1234                 xfs_buf_delwri_pushbuf(bp, buffer_list);
1235                 xfs_buf_rele(bp);
1236 
1237                 error = -EAGAIN;
1238                 goto out_unlock;
1239         }
1240 
1241         error = xfs_qm_dqflush(dqp, &bp);
1242         if (error)
1243                 goto out_unlock;
1244 
1245         xfs_buf_delwri_queue(bp, buffer_list);
1246         xfs_buf_relse(bp);
1247 out_unlock:
1248         xfs_dqunlock(dqp);
1249         return error;
1250 }
1251 
1252 /*
1253  * Walk thru all the filesystem inodes and construct a consistent view
1254  * of the disk quota world. If the quotacheck fails, disable quotas.
1255  */
1256 STATIC int
1257 xfs_qm_quotacheck(
1258         xfs_mount_t     *mp)
1259 {
1260         int                     error, error2;
1261         uint                    flags;
1262         LIST_HEAD               (buffer_list);
1263         struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1264         struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1265         struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1266 
1267         flags = 0;
1268 
1269         ASSERT(uip || gip || pip);
1270         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1271 
1272         xfs_notice(mp, "Quotacheck needed: Please wait.");
1273 
1274         /*
1275          * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1276          * their counters to zero. We need a clean slate.
1277          * We don't log our changes till later.
1278          */
1279         if (uip) {
1280                 error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_QMOPT_UQUOTA,
1281                                          &buffer_list);
1282                 if (error)
1283                         goto error_return;
1284                 flags |= XFS_UQUOTA_CHKD;
1285         }
1286 
1287         if (gip) {
1288                 error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_QMOPT_GQUOTA,
1289                                          &buffer_list);
1290                 if (error)
1291                         goto error_return;
1292                 flags |= XFS_GQUOTA_CHKD;
1293         }
1294 
1295         if (pip) {
1296                 error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_QMOPT_PQUOTA,
1297                                          &buffer_list);
1298                 if (error)
1299                         goto error_return;
1300                 flags |= XFS_PQUOTA_CHKD;
1301         }
1302 
1303         error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
1304                         NULL);
1305         if (error)
1306                 goto error_return;
1307 
1308         /*
1309          * We've made all the changes that we need to make incore.  Flush them
1310          * down to disk buffers if everything was updated successfully.
1311          */
1312         if (XFS_IS_UQUOTA_ON(mp)) {
1313                 error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1314                                           &buffer_list);
1315         }
1316         if (XFS_IS_GQUOTA_ON(mp)) {
1317                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1318                                            &buffer_list);
1319                 if (!error)
1320                         error = error2;
1321         }
1322         if (XFS_IS_PQUOTA_ON(mp)) {
1323                 error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1324                                            &buffer_list);
1325                 if (!error)
1326                         error = error2;
1327         }
1328 
1329         error2 = xfs_buf_delwri_submit(&buffer_list);
1330         if (!error)
1331                 error = error2;
1332 
1333         /*
1334          * We can get this error if we couldn't do a dquot allocation inside
1335          * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1336          * dirty dquots that might be cached, we just want to get rid of them
1337          * and turn quotaoff. The dquots won't be attached to any of the inodes
1338          * at this point (because we intentionally didn't in dqget_noattach).
1339          */
1340         if (error) {
1341                 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1342                 goto error_return;
1343         }
1344 
1345         /*
1346          * If one type of quotas is off, then it will lose its
1347          * quotachecked status, since we won't be doing accounting for
1348          * that type anymore.
1349          */
1350         mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1351         mp->m_qflags |= flags;
1352 
1353  error_return:
1354         xfs_buf_delwri_cancel(&buffer_list);
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                 xfs_irele(uip);
1553         if (gip)
1554                 xfs_irele(gip);
1555         if (pip)
1556                 xfs_irele(pip);
1557         return error;
1558 }
1559 
1560 STATIC void
1561 xfs_qm_destroy_quotainos(
1562         xfs_quotainfo_t *qi)
1563 {
1564         if (qi->qi_uquotaip) {
1565                 xfs_irele(qi->qi_uquotaip);
1566                 qi->qi_uquotaip = NULL; /* paranoia */
1567         }
1568         if (qi->qi_gquotaip) {
1569                 xfs_irele(qi->qi_gquotaip);
1570                 qi->qi_gquotaip = NULL;
1571         }
1572         if (qi->qi_pquotaip) {
1573                 xfs_irele(qi->qi_pquotaip);
1574                 qi->qi_pquotaip = NULL;
1575         }
1576 }
1577 
1578 STATIC void
1579 xfs_qm_dqfree_one(
1580         struct xfs_dquot        *dqp)
1581 {
1582         struct xfs_mount        *mp = dqp->q_mount;
1583         struct xfs_quotainfo    *qi = mp->m_quotainfo;
1584 
1585         mutex_lock(&qi->qi_tree_lock);
1586         radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1587                           be32_to_cpu(dqp->q_core.d_id));
1588 
1589         qi->qi_dquots--;
1590         mutex_unlock(&qi->qi_tree_lock);
1591 
1592         xfs_qm_dqdestroy(dqp);
1593 }
1594 
1595 /* --------------- utility functions for vnodeops ---------------- */
1596 
1597 
1598 /*
1599  * Given an inode, a uid, gid and prid make sure that we have
1600  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1601  * quotas by creating this file.
1602  * This also attaches dquot(s) to the given inode after locking it,
1603  * and returns the dquots corresponding to the uid and/or gid.
1604  *
1605  * in   : inode (unlocked)
1606  * out  : udquot, gdquot with references taken and unlocked
1607  */
1608 int
1609 xfs_qm_vop_dqalloc(
1610         struct xfs_inode        *ip,
1611         xfs_dqid_t              uid,
1612         xfs_dqid_t              gid,
1613         prid_t                  prid,
1614         uint                    flags,
1615         struct xfs_dquot        **O_udqpp,
1616         struct xfs_dquot        **O_gdqpp,
1617         struct xfs_dquot        **O_pdqpp)
1618 {
1619         struct xfs_mount        *mp = ip->i_mount;
1620         struct xfs_dquot        *uq = NULL;
1621         struct xfs_dquot        *gq = NULL;
1622         struct xfs_dquot        *pq = NULL;
1623         int                     error;
1624         uint                    lockflags;
1625 
1626         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1627                 return 0;
1628 
1629         lockflags = XFS_ILOCK_EXCL;
1630         xfs_ilock(ip, lockflags);
1631 
1632         if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1633                 gid = ip->i_d.di_gid;
1634 
1635         /*
1636          * Attach the dquot(s) to this inode, doing a dquot allocation
1637          * if necessary. The dquot(s) will not be locked.
1638          */
1639         if (XFS_NOT_DQATTACHED(mp, ip)) {
1640                 error = xfs_qm_dqattach_locked(ip, true);
1641                 if (error) {
1642                         xfs_iunlock(ip, lockflags);
1643                         return error;
1644                 }
1645         }
1646 
1647         if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1648                 if (ip->i_d.di_uid != uid) {
1649                         /*
1650                          * What we need is the dquot that has this uid, and
1651                          * if we send the inode to dqget, the uid of the inode
1652                          * takes priority over what's sent in the uid argument.
1653                          * We must unlock inode here before calling dqget if
1654                          * we're not sending the inode, because otherwise
1655                          * we'll deadlock by doing trans_reserve while
1656                          * holding ilock.
1657                          */
1658                         xfs_iunlock(ip, lockflags);
1659                         error = xfs_qm_dqget(mp, uid, XFS_DQ_USER, true, &uq);
1660                         if (error) {
1661                                 ASSERT(error != -ENOENT);
1662                                 return error;
1663                         }
1664                         /*
1665                          * Get the ilock in the right order.
1666                          */
1667                         xfs_dqunlock(uq);
1668                         lockflags = XFS_ILOCK_SHARED;
1669                         xfs_ilock(ip, lockflags);
1670                 } else {
1671                         /*
1672                          * Take an extra reference, because we'll return
1673                          * this to caller
1674                          */
1675                         ASSERT(ip->i_udquot);
1676                         uq = xfs_qm_dqhold(ip->i_udquot);
1677                 }
1678         }
1679         if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1680                 if (ip->i_d.di_gid != gid) {
1681                         xfs_iunlock(ip, lockflags);
1682                         error = xfs_qm_dqget(mp, gid, XFS_DQ_GROUP, true, &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, (xfs_dqid_t)prid, XFS_DQ_PROJ,
1699                                         true, &pq);
1700                         if (error) {
1701                                 ASSERT(error != -ENOENT);
1702                                 goto error_rele;
1703                         }
1704                         xfs_dqunlock(pq);
1705                         lockflags = XFS_ILOCK_SHARED;
1706                         xfs_ilock(ip, lockflags);
1707                 } else {
1708                         ASSERT(ip->i_pdquot);
1709                         pq = xfs_qm_dqhold(ip->i_pdquot);
1710                 }
1711         }
1712         if (uq)
1713                 trace_xfs_dquot_dqalloc(ip);
1714 
1715         xfs_iunlock(ip, lockflags);
1716         if (O_udqpp)
1717                 *O_udqpp = uq;
1718         else
1719                 xfs_qm_dqrele(uq);
1720         if (O_gdqpp)
1721                 *O_gdqpp = gq;
1722         else
1723                 xfs_qm_dqrele(gq);
1724         if (O_pdqpp)
1725                 *O_pdqpp = pq;
1726         else
1727                 xfs_qm_dqrele(pq);
1728         return 0;
1729 
1730 error_rele:
1731         xfs_qm_dqrele(gq);
1732         xfs_qm_dqrele(uq);
1733         return error;
1734 }
1735 
1736 /*
1737  * Actually transfer ownership, and do dquot modifications.
1738  * These were already reserved.
1739  */
1740 xfs_dquot_t *
1741 xfs_qm_vop_chown(
1742         xfs_trans_t     *tp,
1743         xfs_inode_t     *ip,
1744         xfs_dquot_t     **IO_olddq,
1745         xfs_dquot_t     *newdq)
1746 {
1747         xfs_dquot_t     *prevdq;
1748         uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1749                                  XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1750 
1751 
1752         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1753         ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1754 
1755         /* old dquot */
1756         prevdq = *IO_olddq;
1757         ASSERT(prevdq);
1758         ASSERT(prevdq != newdq);
1759 
1760         xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1761         xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1762 
1763         /* the sparkling new dquot */
1764         xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1765         xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1766 
1767         /*
1768          * Take an extra reference, because the inode is going to keep
1769          * this dquot pointer even after the trans_commit.
1770          */
1771         *IO_olddq = xfs_qm_dqhold(newdq);
1772 
1773         return prevdq;
1774 }
1775 
1776 /*
1777  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1778  */
1779 int
1780 xfs_qm_vop_chown_reserve(
1781         struct xfs_trans        *tp,
1782         struct xfs_inode        *ip,
1783         struct xfs_dquot        *udqp,
1784         struct xfs_dquot        *gdqp,
1785         struct xfs_dquot        *pdqp,
1786         uint                    flags)
1787 {
1788         struct xfs_mount        *mp = ip->i_mount;
1789         uint64_t                delblks;
1790         unsigned int            blkflags, prjflags = 0;
1791         struct xfs_dquot        *udq_unres = NULL;
1792         struct xfs_dquot        *gdq_unres = NULL;
1793         struct xfs_dquot        *pdq_unres = NULL;
1794         struct xfs_dquot        *udq_delblks = NULL;
1795         struct xfs_dquot        *gdq_delblks = NULL;
1796         struct xfs_dquot        *pdq_delblks = NULL;
1797         int                     error;
1798 
1799 
1800         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1801         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1802 
1803         delblks = ip->i_delayed_blks;
1804         blkflags = XFS_IS_REALTIME_INODE(ip) ?
1805                         XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1806 
1807         if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1808             ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1809                 udq_delblks = udqp;
1810                 /*
1811                  * If there are delayed allocation blocks, then we have to
1812                  * unreserve those from the old dquot, and add them to the
1813                  * new dquot.
1814                  */
1815                 if (delblks) {
1816                         ASSERT(ip->i_udquot);
1817                         udq_unres = ip->i_udquot;
1818                 }
1819         }
1820         if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1821             ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1822                 gdq_delblks = gdqp;
1823                 if (delblks) {
1824                         ASSERT(ip->i_gdquot);
1825                         gdq_unres = ip->i_gdquot;
1826                 }
1827         }
1828 
1829         if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1830             xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1831                 prjflags = XFS_QMOPT_ENOSPC;
1832                 pdq_delblks = pdqp;
1833                 if (delblks) {
1834                         ASSERT(ip->i_pdquot);
1835                         pdq_unres = ip->i_pdquot;
1836                 }
1837         }
1838 
1839         error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1840                                 udq_delblks, gdq_delblks, pdq_delblks,
1841                                 ip->i_d.di_nblocks, 1,
1842                                 flags | blkflags | prjflags);
1843         if (error)
1844                 return error;
1845 
1846         /*
1847          * Do the delayed blks reservations/unreservations now. Since, these
1848          * are done without the help of a transaction, if a reservation fails
1849          * its previous reservations won't be automatically undone by trans
1850          * code. So, we have to do it manually here.
1851          */
1852         if (delblks) {
1853                 /*
1854                  * Do the reservations first. Unreservation can't fail.
1855                  */
1856                 ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1857                 ASSERT(udq_unres || gdq_unres || pdq_unres);
1858                 error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1859                             udq_delblks, gdq_delblks, pdq_delblks,
1860                             (xfs_qcnt_t)delblks, 0,
1861                             flags | blkflags | prjflags);
1862                 if (error)
1863                         return error;
1864                 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1865                                 udq_unres, gdq_unres, pdq_unres,
1866                                 -((xfs_qcnt_t)delblks), 0, blkflags);
1867         }
1868 
1869         return 0;
1870 }
1871 
1872 int
1873 xfs_qm_vop_rename_dqattach(
1874         struct xfs_inode        **i_tab)
1875 {
1876         struct xfs_mount        *mp = i_tab[0]->i_mount;
1877         int                     i;
1878 
1879         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1880                 return 0;
1881 
1882         for (i = 0; (i < 4 && i_tab[i]); i++) {
1883                 struct xfs_inode        *ip = i_tab[i];
1884                 int                     error;
1885 
1886                 /*
1887                  * Watch out for duplicate entries in the table.
1888                  */
1889                 if (i == 0 || ip != i_tab[i-1]) {
1890                         if (XFS_NOT_DQATTACHED(mp, ip)) {
1891                                 error = xfs_qm_dqattach(ip);
1892                                 if (error)
1893                                         return error;
1894                         }
1895                 }
1896         }
1897         return 0;
1898 }
1899 
1900 void
1901 xfs_qm_vop_create_dqattach(
1902         struct xfs_trans        *tp,
1903         struct xfs_inode        *ip,
1904         struct xfs_dquot        *udqp,
1905         struct xfs_dquot        *gdqp,
1906         struct xfs_dquot        *pdqp)
1907 {
1908         struct xfs_mount        *mp = tp->t_mountp;
1909 
1910         if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1911                 return;
1912 
1913         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1914         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1915 
1916         if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1917                 ASSERT(ip->i_udquot == NULL);
1918                 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1919 
1920                 ip->i_udquot = xfs_qm_dqhold(udqp);
1921                 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1922         }
1923         if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1924                 ASSERT(ip->i_gdquot == NULL);
1925                 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1926                 ip->i_gdquot = xfs_qm_dqhold(gdqp);
1927                 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1928         }
1929         if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1930                 ASSERT(ip->i_pdquot == NULL);
1931                 ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1932 
1933                 ip->i_pdquot = xfs_qm_dqhold(pdqp);
1934                 xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1935         }
1936 }
1937
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root/fs/xfs/xfs_qm.c

DEFINITIONS
