fs/xfs/xfs_dquot.c

   1 /*
   2  * Copyright (c) 2000-2003 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_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_alloc.h"
  27 #include "xfs_quota.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_bmap.h"
  32 #include "xfs_rtalloc.h"
  33 #include "xfs_error.h"
  34 #include "xfs_itable.h"
  35 #include "xfs_attr.h"
  36 #include "xfs_buf_item.h"
  37 #include "xfs_trans_space.h"
  38 #include "xfs_trans_priv.h"
  39 #include "xfs_qm.h"
  40 #include "xfs_trace.h"
  41
  42 /*
  43  * Lock order:
  44  *
  45  * ip->i_lock
  46  *   qh->qh_lock
  47  *     qi->qi_dqlist_lock
  48  *       dquot->q_qlock (xfs_dqlock() and friends)
  49  *         dquot->q_flush (xfs_dqflock() and friends)
  50  *         xfs_Gqm->qm_dqfrlist_lock
  51  *
  52  * If two dquots need to be locked the order is user before group/project,
  53  * otherwise by the lowest id first, see xfs_dqlock2.
  54  */
  55
  56 #ifdef DEBUG
  57 xfs_buftarg_t *xfs_dqerror_target;
  58 int xfs_do_dqerror;
  59 int xfs_dqreq_num;
  60 int xfs_dqerror_mod = 33;
  61 #endif
  62
  63 static struct lock_class_key xfs_dquot_other_class;
  64
  65 /*
  66  * This is called to free all the memory associated with a dquot
  67  */
  68 void
  69 xfs_qm_dqdestroy(
  70         xfs_dquot_t     *dqp)
  71 {
  72         ASSERT(list_empty(&dqp->q_freelist));
  73
  74         mutex_destroy(&dqp->q_qlock);
  75         kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
  76
  77         atomic_dec(&xfs_Gqm->qm_totaldquots);
  78 }
  79
  80 /*
  81  * If default limits are in force, push them into the dquot now.
  82  * We overwrite the dquot limits only if they are zero and this
  83  * is not the root dquot.
  84  */
  85 void
  86 xfs_qm_adjust_dqlimits(
  87         xfs_mount_t             *mp,
  88         xfs_disk_dquot_t        *d)
  89 {
  90         xfs_quotainfo_t         *q = mp->m_quotainfo;
  91
  92         ASSERT(d->d_id);
  93
  94         if (q->qi_bsoftlimit && !d->d_blk_softlimit)
  95                 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
  96         if (q->qi_bhardlimit && !d->d_blk_hardlimit)
  97                 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
  98         if (q->qi_isoftlimit && !d->d_ino_softlimit)
  99                 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
 100         if (q->qi_ihardlimit && !d->d_ino_hardlimit)
 101                 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
 102         if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
 103                 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
 104         if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
 105                 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
 106 }
 107
 108 /*
 109  * Check the limits and timers of a dquot and start or reset timers
 110  * if necessary.
 111  * This gets called even when quota enforcement is OFF, which makes our
 112  * life a little less complicated. (We just don't reject any quota
 113  * reservations in that case, when enforcement is off).
 114  * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
 115  * enforcement's off.
 116  * In contrast, warnings are a little different in that they don't
 117  * 'automatically' get started when limits get exceeded.  They do
 118  * get reset to zero, however, when we find the count to be under
 119  * the soft limit (they are only ever set non-zero via userspace).
 120  */
 121 void
 122 xfs_qm_adjust_dqtimers(
 123         xfs_mount_t             *mp,
 124         xfs_disk_dquot_t        *d)
 125 {
 126         ASSERT(d->d_id);
 127
 128 #ifdef DEBUG
 129         if (d->d_blk_hardlimit)
 130                 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
 131                        be64_to_cpu(d->d_blk_hardlimit));
 132         if (d->d_ino_hardlimit)
 133                 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
 134                        be64_to_cpu(d->d_ino_hardlimit));
 135         if (d->d_rtb_hardlimit)
 136                 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
 137                        be64_to_cpu(d->d_rtb_hardlimit));
 138 #endif
 139
 140         if (!d->d_btimer) {
 141                 if ((d->d_blk_softlimit &&
 142                      (be64_to_cpu(d->d_bcount) >=
 143                       be64_to_cpu(d->d_blk_softlimit))) ||
 144                     (d->d_blk_hardlimit &&
 145                      (be64_to_cpu(d->d_bcount) >=
 146                       be64_to_cpu(d->d_blk_hardlimit)))) {
 147                         d->d_btimer = cpu_to_be32(get_seconds() +
 148                                         mp->m_quotainfo->qi_btimelimit);
 149                 } else {
 150                         d->d_bwarns = 0;
 151                 }
 152         } else {
 153                 if ((!d->d_blk_softlimit ||
 154                      (be64_to_cpu(d->d_bcount) <
 155                       be64_to_cpu(d->d_blk_softlimit))) &&
 156                     (!d->d_blk_hardlimit ||
 157                     (be64_to_cpu(d->d_bcount) <
 158                      be64_to_cpu(d->d_blk_hardlimit)))) {
 159                         d->d_btimer = 0;
 160                 }
 161         }
 162
 163         if (!d->d_itimer) {
 164                 if ((d->d_ino_softlimit &&
 165                      (be64_to_cpu(d->d_icount) >=
 166                       be64_to_cpu(d->d_ino_softlimit))) ||
 167                     (d->d_ino_hardlimit &&
 168                      (be64_to_cpu(d->d_icount) >=
 169                       be64_to_cpu(d->d_ino_hardlimit)))) {
 170                         d->d_itimer = cpu_to_be32(get_seconds() +
 171                                         mp->m_quotainfo->qi_itimelimit);
 172                 } else {
 173                         d->d_iwarns = 0;
 174                 }
 175         } else {
 176                 if ((!d->d_ino_softlimit ||
 177                      (be64_to_cpu(d->d_icount) <
 178                       be64_to_cpu(d->d_ino_softlimit)))  &&
 179                     (!d->d_ino_hardlimit ||
 180                      (be64_to_cpu(d->d_icount) <
 181                       be64_to_cpu(d->d_ino_hardlimit)))) {
 182                         d->d_itimer = 0;
 183                 }
 184         }
 185
 186         if (!d->d_rtbtimer) {
 187                 if ((d->d_rtb_softlimit &&
 188                      (be64_to_cpu(d->d_rtbcount) >=
 189                       be64_to_cpu(d->d_rtb_softlimit))) ||
 190                     (d->d_rtb_hardlimit &&
 191                      (be64_to_cpu(d->d_rtbcount) >=
 192                       be64_to_cpu(d->d_rtb_hardlimit)))) {
 193                         d->d_rtbtimer = cpu_to_be32(get_seconds() +
 194                                         mp->m_quotainfo->qi_rtbtimelimit);
 195                 } else {
 196                         d->d_rtbwarns = 0;
 197                 }
 198         } else {
 199                 if ((!d->d_rtb_softlimit ||
 200                      (be64_to_cpu(d->d_rtbcount) <
 201                       be64_to_cpu(d->d_rtb_softlimit))) &&
 202                     (!d->d_rtb_hardlimit ||
 203                      (be64_to_cpu(d->d_rtbcount) <
 204                       be64_to_cpu(d->d_rtb_hardlimit)))) {
 205                         d->d_rtbtimer = 0;
 206                 }
 207         }
 208 }
 209
 210 /*
 211  * initialize a buffer full of dquots and log the whole thing
 212  */
 213 STATIC void
 214 xfs_qm_init_dquot_blk(
 215         xfs_trans_t     *tp,
 216         xfs_mount_t     *mp,
 217         xfs_dqid_t      id,
 218         uint            type,
 219         xfs_buf_t       *bp)
 220 {
 221         struct xfs_quotainfo    *q = mp->m_quotainfo;
 222         xfs_dqblk_t     *d;
 223         int             curid, i;
 224
 225         ASSERT(tp);
 226         ASSERT(xfs_buf_islocked(bp));
 227
 228         d = bp->b_addr;
 229
 230         /*
 231          * ID of the first dquot in the block - id's are zero based.
 232          */
 233         curid = id - (id % q->qi_dqperchunk);
 234         ASSERT(curid >= 0);
 235         memset(d, 0, BBTOB(q->qi_dqchunklen));
 236         for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
 237                 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
 238                 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
 239                 d->dd_diskdq.d_id = cpu_to_be32(curid);
 240                 d->dd_diskdq.d_flags = type;
 241         }
 242
 243         xfs_trans_dquot_buf(tp, bp,
 244                             (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
 245                             ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
 246                              XFS_BLF_GDQUOT_BUF)));
 247         xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
 248 }
 249
 250
 251
 252 /*
 253  * Allocate a block and fill it with dquots.
 254  * This is called when the bmapi finds a hole.
 255  */
 256 STATIC int
 257 xfs_qm_dqalloc(
 258         xfs_trans_t     **tpp,
 259         xfs_mount_t     *mp,
 260         xfs_dquot_t     *dqp,
 261         xfs_inode_t     *quotip,
 262         xfs_fileoff_t   offset_fsb,
 263         xfs_buf_t       **O_bpp)
 264 {
 265         xfs_fsblock_t   firstblock;
 266         xfs_bmap_free_t flist;
 267         xfs_bmbt_irec_t map;
 268         int             nmaps, error, committed;
 269         xfs_buf_t       *bp;
 270         xfs_trans_t     *tp = *tpp;
 271
 272         ASSERT(tp != NULL);
 273
 274         trace_xfs_dqalloc(dqp);
 275
 276         /*
 277          * Initialize the bmap freelist prior to calling bmapi code.
 278          */
 279         xfs_bmap_init(&flist, &firstblock);
 280         xfs_ilock(quotip, XFS_ILOCK_EXCL);
 281         /*
 282          * Return if this type of quotas is turned off while we didn't
 283          * have an inode lock
 284          */
 285         if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
 286                 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
 287                 return (ESRCH);
 288         }
 289
 290         xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
 291         nmaps = 1;
 292         error = xfs_bmapi_write(tp, quotip, offset_fsb,
 293                                 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
 294                                 &firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
 295                                 &map, &nmaps, &flist);
 296         if (error)
 297                 goto error0;
 298         ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
 299         ASSERT(nmaps == 1);
 300         ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
 301                (map.br_startblock != HOLESTARTBLOCK));
 302
 303         /*
 304          * Keep track of the blkno to save a lookup later
 305          */
 306         dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
 307
 308         /* now we can just get the buffer (there's nothing to read yet) */
 309         bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
 310                                dqp->q_blkno,
 311                                mp->m_quotainfo->qi_dqchunklen,
 312                                0);
 313
 314         error = xfs_buf_geterror(bp);
 315         if (error)
 316                 goto error1;
 317
 318         /*
 319          * Make a chunk of dquots out of this buffer and log
 320          * the entire thing.
 321          */
 322         xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
 323                               dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
 324
 325         /*
 326          * xfs_bmap_finish() may commit the current transaction and
 327          * start a second transaction if the freelist is not empty.
 328          *
 329          * Since we still want to modify this buffer, we need to
 330          * ensure that the buffer is not released on commit of
 331          * the first transaction and ensure the buffer is added to the
 332          * second transaction.
 333          *
 334          * If there is only one transaction then don't stop the buffer
 335          * from being released when it commits later on.
 336          */
 337
 338         xfs_trans_bhold(tp, bp);
 339
 340         if ((error = xfs_bmap_finish(tpp, &flist, &committed))) {
 341                 goto error1;
 342         }
 343
 344         if (committed) {
 345                 tp = *tpp;
 346                 xfs_trans_bjoin(tp, bp);
 347         } else {
 348                 xfs_trans_bhold_release(tp, bp);
 349         }
 350
 351         *O_bpp = bp;
 352         return 0;
 353
 354       error1:
 355         xfs_bmap_cancel(&flist);
 356       error0:
 357         xfs_iunlock(quotip, XFS_ILOCK_EXCL);
 358
 359         return (error);
 360 }
 361
 362 /*
 363  * Maps a dquot to the buffer containing its on-disk version.
 364  * This returns a ptr to the buffer containing the on-disk dquot
 365  * in the bpp param, and a ptr to the on-disk dquot within that buffer
 366  */
 367 STATIC int
 368 xfs_qm_dqtobp(
 369         xfs_trans_t             **tpp,
 370         xfs_dquot_t             *dqp,
 371         xfs_disk_dquot_t        **O_ddpp,
 372         xfs_buf_t               **O_bpp,
 373         uint                    flags)
 374 {
 375         xfs_bmbt_irec_t map;
 376         int             nmaps = 1, error;
 377         xfs_buf_t       *bp;
 378         xfs_inode_t     *quotip = XFS_DQ_TO_QIP(dqp);
 379         xfs_mount_t     *mp = dqp->q_mount;
 380         xfs_disk_dquot_t *ddq;
 381         xfs_dqid_t      id = be32_to_cpu(dqp->q_core.d_id);
 382         xfs_trans_t     *tp = (tpp ? *tpp : NULL);
 383
 384         dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
 385
 386         xfs_ilock(quotip, XFS_ILOCK_SHARED);
 387         if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
 388                 /*
 389                  * Return if this type of quotas is turned off while we
 390                  * didn't have the quota inode lock.
 391                  */
 392                 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
 393                 return ESRCH;
 394         }
 395
 396         /*
 397          * Find the block map; no allocations yet
 398          */
 399         error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
 400                                XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
 401
 402         xfs_iunlock(quotip, XFS_ILOCK_SHARED);
 403         if (error)
 404                 return error;
 405
 406         ASSERT(nmaps == 1);
 407         ASSERT(map.br_blockcount == 1);
 408
 409         /*
 410          * Offset of dquot in the (fixed sized) dquot chunk.
 411          */
 412         dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
 413                 sizeof(xfs_dqblk_t);
 414
 415         ASSERT(map.br_startblock != DELAYSTARTBLOCK);
 416         if (map.br_startblock == HOLESTARTBLOCK) {
 417                 /*
 418                  * We don't allocate unless we're asked to
 419                  */
 420                 if (!(flags & XFS_QMOPT_DQALLOC))
 421                         return ENOENT;
 422
 423                 ASSERT(tp);
 424                 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
 425                                         dqp->q_fileoffset, &bp);
 426                 if (error)
 427                         return error;
 428                 tp = *tpp;
 429         } else {
 430                 trace_xfs_dqtobp_read(dqp);
 431
 432                 /*
 433                  * store the blkno etc so that we don't have to do the
 434                  * mapping all the time
 435                  */
 436                 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
 437
 438                 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
 439                                            dqp->q_blkno,
 440                                            mp->m_quotainfo->qi_dqchunklen,
 441                                            0, &bp);
 442                 if (error || !bp)
 443                         return XFS_ERROR(error);
 444         }
 445
 446         ASSERT(xfs_buf_islocked(bp));
 447
 448         /*
 449          * calculate the location of the dquot inside the buffer.
 450          */
 451         ddq = bp->b_addr + dqp->q_bufoffset;
 452
 453         /*
 454          * A simple sanity check in case we got a corrupted dquot...
 455          */
 456         error = xfs_qm_dqcheck(mp, ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
 457                            flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
 458                            "dqtobp");
 459         if (error) {
 460                 if (!(flags & XFS_QMOPT_DQREPAIR)) {
 461                         xfs_trans_brelse(tp, bp);
 462                         return XFS_ERROR(EIO);
 463                 }
 464         }
 465
 466         *O_bpp = bp;
 467         *O_ddpp = ddq;
 468
 469         return (0);
 470 }
 471
 472
 473 /*
 474  * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
 475  * and release the buffer immediately.
 476  *
 477  * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
 478  */
 479 int
 480 xfs_qm_dqread(
 481         struct xfs_mount        *mp,
 482         xfs_dqid_t              id,
 483         uint                    type,
 484         uint                    flags,
 485         struct xfs_dquot        **O_dqpp)
 486 {
 487         struct xfs_dquot        *dqp;
 488         struct xfs_disk_dquot   *ddqp;
 489         struct xfs_buf          *bp;
 490         struct xfs_trans        *tp = NULL;
 491         int                     error;
 492         int                     cancelflags = 0;
 493
 494
 495         dqp = kmem_zone_zalloc(xfs_Gqm->qm_dqzone, KM_SLEEP);
 496
 497         dqp->dq_flags = type;
 498         dqp->q_core.d_id = cpu_to_be32(id);
 499         dqp->q_mount = mp;
 500         INIT_LIST_HEAD(&dqp->q_freelist);
 501         mutex_init(&dqp->q_qlock);
 502         init_waitqueue_head(&dqp->q_pinwait);
 503
 504         /*
 505          * Because we want to use a counting completion, complete
 506          * the flush completion once to allow a single access to
 507          * the flush completion without blocking.
 508          */
 509         init_completion(&dqp->q_flush);
 510         complete(&dqp->q_flush);
 511
 512         /*
 513          * Make sure group quotas have a different lock class than user
 514          * quotas.
 515          */
 516         if (!(type & XFS_DQ_USER))
 517                 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
 518
 519         atomic_inc(&xfs_Gqm->qm_totaldquots);
 520
 521         trace_xfs_dqread(dqp);
 522
 523         if (flags & XFS_QMOPT_DQALLOC) {
 524                 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
 525                 error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp),
 526                                 XFS_WRITE_LOG_RES(mp) +
 527                                 /*
 528                                  * Round the chunklen up to the next multiple
 529                                  * of 128 (buf log item chunk size)).
 530                                  */
 531                                 BBTOB(mp->m_quotainfo->qi_dqchunklen) - 1 + 128,
 532                                 0,
 533                                 XFS_TRANS_PERM_LOG_RES,
 534                                 XFS_WRITE_LOG_COUNT);
 535                 if (error)
 536                         goto error1;
 537                 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
 538         }
 539
 540         /*
 541          * get a pointer to the on-disk dquot and the buffer containing it
 542          * dqp already knows its own type (GROUP/USER).
 543          */
 544         error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
 545         if (error) {
 546                 /*
 547                  * This can happen if quotas got turned off (ESRCH),
 548                  * or if the dquot didn't exist on disk and we ask to
 549                  * allocate (ENOENT).
 550                  */
 551                 trace_xfs_dqread_fail(dqp);
 552                 cancelflags |= XFS_TRANS_ABORT;
 553                 goto error1;
 554         }
 555
 556         /* copy everything from disk dquot to the incore dquot */
 557         memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
 558         xfs_qm_dquot_logitem_init(dqp);
 559
 560         /*
 561          * Reservation counters are defined as reservation plus current usage
 562          * to avoid having to add every time.
 563          */
 564         dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
 565         dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
 566         dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
 567
 568         /* Mark the buf so that this will stay incore a little longer */
 569         xfs_buf_set_ref(bp, XFS_DQUOT_REF);
 570
 571         /*
 572          * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
 573          * So we need to release with xfs_trans_brelse().
 574          * The strategy here is identical to that of inodes; we lock
 575          * the dquot in xfs_qm_dqget() before making it accessible to
 576          * others. This is because dquots, like inodes, need a good level of
 577          * concurrency, and we don't want to take locks on the entire buffers
 578          * for dquot accesses.
 579          * Note also that the dquot buffer may even be dirty at this point, if
 580          * this particular dquot was repaired. We still aren't afraid to
 581          * brelse it because we have the changes incore.
 582          */
 583         ASSERT(xfs_buf_islocked(bp));
 584         xfs_trans_brelse(tp, bp);
 585
 586         if (tp) {
 587                 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
 588                 if (error)
 589                         goto error0;
 590         }
 591
 592         *O_dqpp = dqp;
 593         return error;
 594
 595 error1:
 596         if (tp)
 597                 xfs_trans_cancel(tp, cancelflags);
 598 error0:
 599         xfs_qm_dqdestroy(dqp);
 600         *O_dqpp = NULL;
 601         return error;
 602 }
 603
 604 /*
 605  * Lookup a dquot in the incore dquot hashtable. We keep two separate
 606  * hashtables for user and group dquots; and, these are global tables
 607  * inside the XQM, not per-filesystem tables.
 608  * The hash chain must be locked by caller, and it is left locked
 609  * on return. Returning dquot is locked.
 610  */
 611 STATIC int
 612 xfs_qm_dqlookup(
 613         xfs_mount_t             *mp,
 614         xfs_dqid_t              id,
 615         xfs_dqhash_t            *qh,
 616         xfs_dquot_t             **O_dqpp)
 617 {
 618         xfs_dquot_t             *dqp;
 619
 620         ASSERT(mutex_is_locked(&qh->qh_lock));
 621
 622         /*
 623          * Traverse the hashchain looking for a match
 624          */
 625         list_for_each_entry(dqp, &qh->qh_list, q_hashlist) {
 626                 /*
 627                  * We already have the hashlock. We don't need the
 628                  * dqlock to look at the id field of the dquot, since the
 629                  * id can't be modified without the hashlock anyway.
 630                  */
 631                 if (be32_to_cpu(dqp->q_core.d_id) != id || dqp->q_mount != mp)
 632                         continue;
 633
 634                 trace_xfs_dqlookup_found(dqp);
 635
 636                 xfs_dqlock(dqp);
 637                 if (dqp->dq_flags & XFS_DQ_FREEING) {
 638                         *O_dqpp = NULL;
 639                         xfs_dqunlock(dqp);
 640                         return -1;
 641                 }
 642
 643                 dqp->q_nrefs++;
 644
 645                 /*
 646                  * move the dquot to the front of the hashchain
 647                  */
 648                 list_move(&dqp->q_hashlist, &qh->qh_list);
 649                 trace_xfs_dqlookup_done(dqp);
 650                 *O_dqpp = dqp;
 651                 return 0;
 652         }
 653
 654         *O_dqpp = NULL;
 655         return 1;
 656 }
 657
 658 /*
 659  * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
 660  * a locked dquot, doing an allocation (if requested) as needed.
 661  * When both an inode and an id are given, the inode's id takes precedence.
 662  * That is, if the id changes while we don't hold the ilock inside this
 663  * function, the new dquot is returned, not necessarily the one requested
 664  * in the id argument.
 665  */
 666 int
 667 xfs_qm_dqget(
 668         xfs_mount_t     *mp,
 669         xfs_inode_t     *ip,      /* locked inode (optional) */
 670         xfs_dqid_t      id,       /* uid/projid/gid depending on type */
 671         uint            type,     /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
 672         uint            flags,    /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
 673         xfs_dquot_t     **O_dqpp) /* OUT : locked incore dquot */
 674 {
 675         xfs_dquot_t     *dqp;
 676         xfs_dqhash_t    *h;
 677         uint            version;
 678         int             error;
 679
 680         ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 681         if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
 682             (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
 683             (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
 684                 return (ESRCH);
 685         }
 686         h = XFS_DQ_HASH(mp, id, type);
 687
 688 #ifdef DEBUG
 689         if (xfs_do_dqerror) {
 690                 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
 691                     (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
 692                         xfs_debug(mp, "Returning error in dqget");
 693                         return (EIO);
 694                 }
 695         }
 696
 697         ASSERT(type == XFS_DQ_USER ||
 698                type == XFS_DQ_PROJ ||
 699                type == XFS_DQ_GROUP);
 700         if (ip) {
 701                 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 702                 if (type == XFS_DQ_USER)
 703                         ASSERT(ip->i_udquot == NULL);
 704                 else
 705                         ASSERT(ip->i_gdquot == NULL);
 706         }
 707 #endif
 708
 709 restart:
 710         mutex_lock(&h->qh_lock);
 711
 712         /*
 713          * Look in the cache (hashtable).
 714          * The chain is kept locked during lookup.
 715          */
 716         switch (xfs_qm_dqlookup(mp, id, h, O_dqpp)) {
 717         case -1:
 718                 XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
 719                 mutex_unlock(&h->qh_lock);
 720                 delay(1);
 721                 goto restart;
 722         case 0:
 723                 XQM_STATS_INC(xqmstats.xs_qm_dqcachehits);
 724                 /*
 725                  * The dquot was found, moved to the front of the chain,
 726                  * taken off the freelist if it was on it, and locked
 727                  * at this point. Just unlock the hashchain and return.
 728                  */
 729                 ASSERT(*O_dqpp);
 730                 ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp));
 731                 mutex_unlock(&h->qh_lock);
 732                 trace_xfs_dqget_hit(*O_dqpp);
 733                 return 0;       /* success */
 734         default:
 735                 XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses);
 736                 break;
 737         }
 738
 739         /*
 740          * Dquot cache miss. We don't want to keep the inode lock across
 741          * a (potential) disk read. Also we don't want to deal with the lock
 742          * ordering between quotainode and this inode. OTOH, dropping the inode
 743          * lock here means dealing with a chown that can happen before
 744          * we re-acquire the lock.
 745          */
 746         if (ip)
 747                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
 748         /*
 749          * Save the hashchain version stamp, and unlock the chain, so that
 750          * we don't keep the lock across a disk read
 751          */
 752         version = h->qh_version;
 753         mutex_unlock(&h->qh_lock);
 754
 755         error = xfs_qm_dqread(mp, id, type, flags, &dqp);
 756
 757         if (ip)
 758                 xfs_ilock(ip, XFS_ILOCK_EXCL);
 759
 760         if (error)
 761                 return error;
 762
 763         /*
 764          * Dquot lock comes after hashlock in the lock ordering
 765          */
 766         if (ip) {
 767                 /*
 768                  * A dquot could be attached to this inode by now, since
 769                  * we had dropped the ilock.
 770                  */
 771                 if (type == XFS_DQ_USER) {
 772                         if (!XFS_IS_UQUOTA_ON(mp)) {
 773                                 /* inode stays locked on return */
 774                                 xfs_qm_dqdestroy(dqp);
 775                                 return XFS_ERROR(ESRCH);
 776                         }
 777                         if (ip->i_udquot) {
 778                                 xfs_qm_dqdestroy(dqp);
 779                                 dqp = ip->i_udquot;
 780                                 xfs_dqlock(dqp);
 781                                 goto dqret;
 782                         }
 783                 } else {
 784                         if (!XFS_IS_OQUOTA_ON(mp)) {
 785                                 /* inode stays locked on return */
 786                                 xfs_qm_dqdestroy(dqp);
 787                                 return XFS_ERROR(ESRCH);
 788                         }
 789                         if (ip->i_gdquot) {
 790                                 xfs_qm_dqdestroy(dqp);
 791                                 dqp = ip->i_gdquot;
 792                                 xfs_dqlock(dqp);
 793                                 goto dqret;
 794                         }
 795                 }
 796         }
 797
 798         /*
 799          * Hashlock comes after ilock in lock order
 800          */
 801         mutex_lock(&h->qh_lock);
 802         if (version != h->qh_version) {
 803                 xfs_dquot_t *tmpdqp;
 804                 /*
 805                  * Now, see if somebody else put the dquot in the
 806                  * hashtable before us. This can happen because we didn't
 807                  * keep the hashchain lock. We don't have to worry about
 808                  * lock order between the two dquots here since dqp isn't
 809                  * on any findable lists yet.
 810                  */
 811                 switch (xfs_qm_dqlookup(mp, id, h, &tmpdqp)) {
 812                 case 0:
 813                 case -1:
 814                         /*
 815                          * Duplicate found, either in cache or on its way out.
 816                          * Just throw away the new dquot and start over.
 817                          */
 818                         if (tmpdqp)
 819                                 xfs_qm_dqput(tmpdqp);
 820                         mutex_unlock(&h->qh_lock);
 821                         xfs_qm_dqdestroy(dqp);
 822                         XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
 823                         goto restart;
 824                 default:
 825                         break;
 826                 }
 827         }
 828
 829         /*
 830          * Put the dquot at the beginning of the hash-chain and mp's list
 831          * LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock ..
 832          */
 833         ASSERT(mutex_is_locked(&h->qh_lock));
 834         dqp->q_hash = h;
 835         list_add(&dqp->q_hashlist, &h->qh_list);
 836         h->qh_version++;
 837
 838         /*
 839          * Attach this dquot to this filesystem's list of all dquots,
 840          * kept inside the mount structure in m_quotainfo field
 841          */
 842         mutex_lock(&mp->m_quotainfo->qi_dqlist_lock);
 843
 844         /*
 845          * We return a locked dquot to the caller, with a reference taken
 846          */
 847         xfs_dqlock(dqp);
 848         dqp->q_nrefs = 1;
 849
 850         list_add(&dqp->q_mplist, &mp->m_quotainfo->qi_dqlist);
 851         mp->m_quotainfo->qi_dquots++;
 852         mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
 853         mutex_unlock(&h->qh_lock);
 854  dqret:
 855         ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
 856         trace_xfs_dqget_miss(dqp);
 857         *O_dqpp = dqp;
 858         return (0);
 859 }
 860
 861
 862 /*
 863  * Release a reference to the dquot (decrement ref-count)
 864  * and unlock it. If there is a group quota attached to this
 865  * dquot, carefully release that too without tripping over
 866  * deadlocks'n'stuff.
 867  */
 868 void
 869 xfs_qm_dqput(
 870         struct xfs_dquot        *dqp)
 871 {
 872         struct xfs_dquot        *gdqp;
 873
 874         ASSERT(dqp->q_nrefs > 0);
 875         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 876
 877         trace_xfs_dqput(dqp);
 878
 879 recurse:
 880         if (--dqp->q_nrefs > 0) {
 881                 xfs_dqunlock(dqp);
 882                 return;
 883         }
 884
 885         trace_xfs_dqput_free(dqp);
 886
 887         mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
 888         if (list_empty(&dqp->q_freelist)) {
 889                 list_add_tail(&dqp->q_freelist, &xfs_Gqm->qm_dqfrlist);
 890                 xfs_Gqm->qm_dqfrlist_cnt++;
 891         }
 892         mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
 893
 894         /*
 895          * If we just added a udquot to the freelist, then we want to release
 896          * the gdquot reference that it (probably) has. Otherwise it'll keep
 897          * the gdquot from getting reclaimed.
 898          */
 899         gdqp = dqp->q_gdquot;
 900         if (gdqp) {
 901                 xfs_dqlock(gdqp);
 902                 dqp->q_gdquot = NULL;
 903         }
 904         xfs_dqunlock(dqp);
 905
 906         /*
 907          * If we had a group quota hint, release it now.
 908          */
 909         if (gdqp) {
 910                 dqp = gdqp;
 911                 goto recurse;
 912         }
 913 }
 914
 915 /*
 916  * Release a dquot. Flush it if dirty, then dqput() it.
 917  * dquot must not be locked.
 918  */
 919 void
 920 xfs_qm_dqrele(
 921         xfs_dquot_t     *dqp)
 922 {
 923         if (!dqp)
 924                 return;
 925
 926         trace_xfs_dqrele(dqp);
 927
 928         xfs_dqlock(dqp);
 929         /*
 930          * We don't care to flush it if the dquot is dirty here.
 931          * That will create stutters that we want to avoid.
 932          * Instead we do a delayed write when we try to reclaim
 933          * a dirty dquot. Also xfs_sync will take part of the burden...
 934          */
 935         xfs_qm_dqput(dqp);
 936 }
 937
 938 /*
 939  * This is the dquot flushing I/O completion routine.  It is called
 940  * from interrupt level when the buffer containing the dquot is
 941  * flushed to disk.  It is responsible for removing the dquot logitem
 942  * from the AIL if it has not been re-logged, and unlocking the dquot's
 943  * flush lock. This behavior is very similar to that of inodes..
 944  */
 945 STATIC void
 946 xfs_qm_dqflush_done(
 947         struct xfs_buf          *bp,
 948         struct xfs_log_item     *lip)
 949 {
 950         xfs_dq_logitem_t        *qip = (struct xfs_dq_logitem *)lip;
 951         xfs_dquot_t             *dqp = qip->qli_dquot;
 952         struct xfs_ail          *ailp = lip->li_ailp;
 953
 954         /*
 955          * We only want to pull the item from the AIL if its
 956          * location in the log has not changed since we started the flush.
 957          * Thus, we only bother if the dquot's lsn has
 958          * not changed. First we check the lsn outside the lock
 959          * since it's cheaper, and then we recheck while
 960          * holding the lock before removing the dquot from the AIL.
 961          */
 962         if ((lip->li_flags & XFS_LI_IN_AIL) &&
 963             lip->li_lsn == qip->qli_flush_lsn) {
 964
 965                 /* xfs_trans_ail_delete() drops the AIL lock. */
 966                 spin_lock(&ailp->xa_lock);
 967                 if (lip->li_lsn == qip->qli_flush_lsn)
 968                         xfs_trans_ail_delete(ailp, lip);
 969                 else
 970                         spin_unlock(&ailp->xa_lock);
 971         }
 972
 973         /*
 974          * Release the dq's flush lock since we're done with it.
 975          */
 976         xfs_dqfunlock(dqp);
 977 }
 978
 979 /*
 980  * Write a modified dquot to disk.
 981  * The dquot must be locked and the flush lock too taken by caller.
 982  * The flush lock will not be unlocked until the dquot reaches the disk,
 983  * but the dquot is free to be unlocked and modified by the caller
 984  * in the interim. Dquot is still locked on return. This behavior is
 985  * identical to that of inodes.
 986  */
 987 int
 988 xfs_qm_dqflush(
 989         xfs_dquot_t             *dqp,
 990         uint                    flags)
 991 {
 992         struct xfs_mount        *mp = dqp->q_mount;
 993         struct xfs_buf          *bp;
 994         struct xfs_disk_dquot   *ddqp;
 995         int                     error;
 996
 997         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 998         ASSERT(!completion_done(&dqp->q_flush));
 999
1000         trace_xfs_dqflush(dqp);
1001
1002         /*
1003          * If not dirty, or it's pinned and we are not supposed to block, nada.
1004          */
1005         if (!XFS_DQ_IS_DIRTY(dqp) ||
1006             ((flags & SYNC_TRYLOCK) && atomic_read(&dqp->q_pincount) > 0)) {
1007                 xfs_dqfunlock(dqp);
1008                 return 0;
1009         }
1010         xfs_qm_dqunpin_wait(dqp);
1011
1012         /*
1013          * This may have been unpinned because the filesystem is shutting
1014          * down forcibly. If that's the case we must not write this dquot
1015          * to disk, because the log record didn't make it to disk!
1016          */
1017         if (XFS_FORCED_SHUTDOWN(mp)) {
1018                 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1019                 xfs_dqfunlock(dqp);
1020                 return XFS_ERROR(EIO);
1021         }
1022
1023         /*
1024          * Get the buffer containing the on-disk dquot
1025          */
1026         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1027                                    mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1028         if (error) {
1029                 ASSERT(error != ENOENT);
1030                 xfs_dqfunlock(dqp);
1031                 return error;
1032         }
1033
1034         /*
1035          * Calculate the location of the dquot inside the buffer.
1036          */
1037         ddqp = bp->b_addr + dqp->q_bufoffset;
1038
1039         /*
1040          * A simple sanity check in case we got a corrupted dquot..
1041          */
1042         error = xfs_qm_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
1043                            XFS_QMOPT_DOWARN, "dqflush (incore copy)");
1044         if (error) {
1045                 xfs_buf_relse(bp);
1046                 xfs_dqfunlock(dqp);
1047                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1048                 return XFS_ERROR(EIO);
1049         }
1050
1051         /* This is the only portion of data that needs to persist */
1052         memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1053
1054         /*
1055          * Clear the dirty field and remember the flush lsn for later use.
1056          */
1057         dqp->dq_flags &= ~XFS_DQ_DIRTY;
1058
1059         xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1060                                         &dqp->q_logitem.qli_item.li_lsn);
1061
1062         /*
1063          * Attach an iodone routine so that we can remove this dquot from the
1064          * AIL and release the flush lock once the dquot is synced to disk.
1065          */
1066         xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1067                                   &dqp->q_logitem.qli_item);
1068
1069         /*
1070          * If the buffer is pinned then push on the log so we won't
1071          * get stuck waiting in the write for too long.
1072          */
1073         if (xfs_buf_ispinned(bp)) {
1074                 trace_xfs_dqflush_force(dqp);
1075                 xfs_log_force(mp, 0);
1076         }
1077
1078         if (flags & SYNC_WAIT)
1079                 error = xfs_bwrite(bp);
1080         else
1081                 xfs_buf_delwri_queue(bp);
1082
1083         xfs_buf_relse(bp);
1084
1085         trace_xfs_dqflush_done(dqp);
1086
1087         /*
1088          * dqp is still locked, but caller is free to unlock it now.
1089          */
1090         return error;
1091
1092 }
1093
1094 void
1095 xfs_dqunlock(
1096         xfs_dquot_t *dqp)
1097 {
1098         xfs_dqunlock_nonotify(dqp);
1099         if (dqp->q_logitem.qli_dquot == dqp) {
1100                 xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_ailp,
1101                                         &dqp->q_logitem.qli_item);
1102         }
1103 }
1104
1105 /*
1106  * Lock two xfs_dquot structures.
1107  *
1108  * To avoid deadlocks we always lock the quota structure with
1109  * the lowerd id first.
1110  */
1111 void
1112 xfs_dqlock2(
1113         xfs_dquot_t     *d1,
1114         xfs_dquot_t     *d2)
1115 {
1116         if (d1 && d2) {
1117                 ASSERT(d1 != d2);
1118                 if (be32_to_cpu(d1->q_core.d_id) >
1119                     be32_to_cpu(d2->q_core.d_id)) {
1120                         mutex_lock(&d2->q_qlock);
1121                         mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1122                 } else {
1123                         mutex_lock(&d1->q_qlock);
1124                         mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1125                 }
1126         } else if (d1) {
1127                 mutex_lock(&d1->q_qlock);
1128         } else if (d2) {
1129                 mutex_lock(&d2->q_qlock);
1130         }
1131 }
1132
1133 /*
1134  * Take a dquot out of the mount's dqlist as well as the hashlist.  This is
1135  * called via unmount as well as quotaoff, and the purge will always succeed.
1136  */
1137 void
1138 xfs_qm_dqpurge(
1139         struct xfs_dquot        *dqp)
1140 {
1141         struct xfs_mount        *mp = dqp->q_mount;
1142         struct xfs_dqhash       *qh = dqp->q_hash;
1143
1144         xfs_dqlock(dqp);
1145
1146         /*
1147          * If we're turning off quotas, we have to make sure that, for
1148          * example, we don't delete quota disk blocks while dquots are
1149          * in the process of getting written to those disk blocks.
1150          * This dquot might well be on AIL, and we can't leave it there
1151          * if we're turning off quotas. Basically, we need this flush
1152          * lock, and are willing to block on it.
1153          */
1154         if (!xfs_dqflock_nowait(dqp)) {
1155                 /*
1156                  * Block on the flush lock after nudging dquot buffer,
1157                  * if it is incore.
1158                  */
1159                 xfs_dqflock_pushbuf_wait(dqp);
1160         }
1161
1162         /*
1163          * If we are turning this type of quotas off, we don't care
1164          * about the dirty metadata sitting in this dquot. OTOH, if
1165          * we're unmounting, we do care, so we flush it and wait.
1166          */
1167         if (XFS_DQ_IS_DIRTY(dqp)) {
1168                 int     error;
1169
1170                 /*
1171                  * We don't care about getting disk errors here. We need
1172                  * to purge this dquot anyway, so we go ahead regardless.
1173                  */
1174                 error = xfs_qm_dqflush(dqp, SYNC_WAIT);
1175                 if (error)
1176                         xfs_warn(mp, "%s: dquot %p flush failed",
1177                                 __func__, dqp);
1178                 xfs_dqflock(dqp);
1179         }
1180
1181         ASSERT(atomic_read(&dqp->q_pincount) == 0);
1182         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1183                !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
1184
1185         xfs_dqfunlock(dqp);
1186         xfs_dqunlock(dqp);
1187
1188         mutex_lock(&qh->qh_lock);
1189         list_del_init(&dqp->q_hashlist);
1190         qh->qh_version++;
1191         mutex_unlock(&qh->qh_lock);
1192
1193         mutex_lock(&mp->m_quotainfo->qi_dqlist_lock);
1194         list_del_init(&dqp->q_mplist);
1195         mp->m_quotainfo->qi_dqreclaims++;
1196         mp->m_quotainfo->qi_dquots--;
1197         mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
1198
1199         /*
1200          * We move dquots to the freelist as soon as their reference count
1201          * hits zero, so it really should be on the freelist here.
1202          */
1203         mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
1204         ASSERT(!list_empty(&dqp->q_freelist));
1205         list_del_init(&dqp->q_freelist);
1206         xfs_Gqm->qm_dqfrlist_cnt--;
1207         mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
1208
1209         xfs_qm_dqdestroy(dqp);
1210 }
1211
1212 /*
1213  * Give the buffer a little push if it is incore and
1214  * wait on the flush lock.
1215  */
1216 void
1217 xfs_dqflock_pushbuf_wait(
1218         xfs_dquot_t     *dqp)
1219 {
1220         xfs_mount_t     *mp = dqp->q_mount;
1221         xfs_buf_t       *bp;
1222
1223         /*
1224          * Check to see if the dquot has been flushed delayed
1225          * write.  If so, grab its buffer and send it
1226          * out immediately.  We'll be able to acquire
1227          * the flush lock when the I/O completes.
1228          */
1229         bp = xfs_incore(mp->m_ddev_targp, dqp->q_blkno,
1230                         mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
1231         if (!bp)
1232                 goto out_lock;
1233
1234         if (XFS_BUF_ISDELAYWRITE(bp)) {
1235                 if (xfs_buf_ispinned(bp))
1236                         xfs_log_force(mp, 0);
1237                 xfs_buf_delwri_promote(bp);
1238                 wake_up_process(bp->b_target->bt_task);
1239         }
1240         xfs_buf_relse(bp);
1241 out_lock:
1242         xfs_dqflock(dqp);
1243 }