git.oblomov.eu Git - linux-2.6/blob - fs/xfs/quota/xfs_dquot_item.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_dir.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_alloc.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_mount.h"
  32 #include "xfs_bmap_btree.h"
  33 #include "xfs_alloc_btree.h"
  34 #include "xfs_ialloc_btree.h"
  35 #include "xfs_dir_sf.h"
  36 #include "xfs_dir2_sf.h"
  37 #include "xfs_attr_sf.h"
  38 #include "xfs_dinode.h"
  39 #include "xfs_inode.h"
  40 #include "xfs_bmap.h"
  41 #include "xfs_btree.h"
  42 #include "xfs_ialloc.h"
  43 #include "xfs_rtalloc.h"
  44 #include "xfs_error.h"
  45 #include "xfs_itable.h"
  46 #include "xfs_rw.h"
  47 #include "xfs_acl.h"
  48 #include "xfs_cap.h"
  49 #include "xfs_mac.h"
  50 #include "xfs_attr.h"
  51 #include "xfs_buf_item.h"
  52 #include "xfs_trans_priv.h"
  53 #include "xfs_qm.h"
  54
  55 /*
  56  * returns the number of iovecs needed to log the given dquot item.
  57  */
  58 /* ARGSUSED */
  59 STATIC uint
  60 xfs_qm_dquot_logitem_size(
  61         xfs_dq_logitem_t        *logitem)
  62 {
  63         /*
  64          * we need only two iovecs, one for the format, one for the real thing
  65          */
  66         return (2);
  67 }
  68
  69 /*
  70  * fills in the vector of log iovecs for the given dquot log item.
  71  */
  72 STATIC void
  73 xfs_qm_dquot_logitem_format(
  74         xfs_dq_logitem_t        *logitem,
  75         xfs_log_iovec_t         *logvec)
  76 {
  77         ASSERT(logitem);
  78         ASSERT(logitem->qli_dquot);
  79
  80         logvec->i_addr = (xfs_caddr_t)&logitem->qli_format;
  81         logvec->i_len  = sizeof(xfs_dq_logformat_t);
  82         logvec++;
  83         logvec->i_addr = (xfs_caddr_t)&logitem->qli_dquot->q_core;
  84         logvec->i_len  = sizeof(xfs_disk_dquot_t);
  85
  86         ASSERT(2 == logitem->qli_item.li_desc->lid_size);
  87         logitem->qli_format.qlf_size = 2;
  88
  89 }
  90
  91 /*
  92  * Increment the pin count of the given dquot.
  93  * This value is protected by pinlock spinlock in the xQM structure.
  94  */
  95 STATIC void
  96 xfs_qm_dquot_logitem_pin(
  97         xfs_dq_logitem_t *logitem)
  98 {
  99         unsigned long   s;
 100         xfs_dquot_t *dqp;
 101
 102         dqp = logitem->qli_dquot;
 103         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 104         s = XFS_DQ_PINLOCK(dqp);
 105         dqp->q_pincount++;
 106         XFS_DQ_PINUNLOCK(dqp, s);
 107 }
 108
 109 /*
 110  * Decrement the pin count of the given dquot, and wake up
 111  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
 112  * dquot must have been previously pinned with a call to xfs_dqpin().
 113  */
 114 /* ARGSUSED */
 115 STATIC void
 116 xfs_qm_dquot_logitem_unpin(
 117         xfs_dq_logitem_t *logitem,
 118         int               stale)
 119 {
 120         unsigned long   s;
 121         xfs_dquot_t *dqp;
 122
 123         dqp = logitem->qli_dquot;
 124         ASSERT(dqp->q_pincount > 0);
 125         s = XFS_DQ_PINLOCK(dqp);
 126         dqp->q_pincount--;
 127         if (dqp->q_pincount == 0) {
 128                 sv_broadcast(&dqp->q_pinwait);
 129         }
 130         XFS_DQ_PINUNLOCK(dqp, s);
 131 }
 132
 133 /* ARGSUSED */
 134 STATIC void
 135 xfs_qm_dquot_logitem_unpin_remove(
 136         xfs_dq_logitem_t *logitem,
 137         xfs_trans_t      *tp)
 138 {
 139         xfs_qm_dquot_logitem_unpin(logitem, 0);
 140 }
 141
 142 /*
 143  * Given the logitem, this writes the corresponding dquot entry to disk
 144  * asynchronously. This is called with the dquot entry securely locked;
 145  * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
 146  * at the end.
 147  */
 148 STATIC void
 149 xfs_qm_dquot_logitem_push(
 150         xfs_dq_logitem_t        *logitem)
 151 {
 152         xfs_dquot_t     *dqp;
 153
 154         dqp = logitem->qli_dquot;
 155
 156         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 157         ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp));
 158
 159         /*
 160          * Since we were able to lock the dquot's flush lock and
 161          * we found it on the AIL, the dquot must be dirty.  This
 162          * is because the dquot is removed from the AIL while still
 163          * holding the flush lock in xfs_dqflush_done().  Thus, if
 164          * we found it in the AIL and were able to obtain the flush
 165          * lock without sleeping, then there must not have been
 166          * anyone in the process of flushing the dquot.
 167          */
 168         xfs_qm_dqflush(dqp, XFS_B_DELWRI);
 169         xfs_dqunlock(dqp);
 170 }
 171
 172 /*ARGSUSED*/
 173 STATIC xfs_lsn_t
 174 xfs_qm_dquot_logitem_committed(
 175         xfs_dq_logitem_t        *l,
 176         xfs_lsn_t               lsn)
 177 {
 178         /*
 179          * We always re-log the entire dquot when it becomes dirty,
 180          * so, the latest copy _is_ the only one that matters.
 181          */
 182         return (lsn);
 183 }
 184
 185
 186 /*
 187  * This is called to wait for the given dquot to be unpinned.
 188  * Most of these pin/unpin routines are plagiarized from inode code.
 189  */
 190 void
 191 xfs_qm_dqunpin_wait(
 192         xfs_dquot_t     *dqp)
 193 {
 194         SPLDECL(s);
 195
 196         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 197         if (dqp->q_pincount == 0) {
 198                 return;
 199         }
 200
 201         /*
 202          * Give the log a push so we don't wait here too long.
 203          */
 204         xfs_log_force(dqp->q_mount, (xfs_lsn_t)0, XFS_LOG_FORCE);
 205         s = XFS_DQ_PINLOCK(dqp);
 206         if (dqp->q_pincount == 0) {
 207                 XFS_DQ_PINUNLOCK(dqp, s);
 208                 return;
 209         }
 210         sv_wait(&(dqp->q_pinwait), PINOD,
 211                 &(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s);
 212 }
 213
 214 /*
 215  * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
 216  * the dquot is locked by us, but the flush lock isn't. So, here we are
 217  * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
 218  * If so, we want to push it out to help us take this item off the AIL as soon
 219  * as possible.
 220  *
 221  * We must not be holding the AIL_LOCK at this point. Calling incore() to
 222  * search the buffercache can be a time consuming thing, and AIL_LOCK is a
 223  * spinlock.
 224  */
 225 STATIC void
 226 xfs_qm_dquot_logitem_pushbuf(
 227         xfs_dq_logitem_t    *qip)
 228 {
 229         xfs_dquot_t     *dqp;
 230         xfs_mount_t     *mp;
 231         xfs_buf_t       *bp;
 232         uint            dopush;
 233
 234         dqp = qip->qli_dquot;
 235         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 236
 237         /*
 238          * The qli_pushbuf_flag keeps others from
 239          * trying to duplicate our effort.
 240          */
 241         ASSERT(qip->qli_pushbuf_flag != 0);
 242         ASSERT(qip->qli_push_owner == get_thread_id());
 243
 244         /*
 245          * If flushlock isn't locked anymore, chances are that the
 246          * inode flush completed and the inode was taken off the AIL.
 247          * So, just get out.
 248          */
 249         if ((valusema(&(dqp->q_flock)) > 0)  ||
 250             ((qip->qli_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 251                 qip->qli_pushbuf_flag = 0;
 252                 xfs_dqunlock(dqp);
 253                 return;
 254         }
 255         mp = dqp->q_mount;
 256         bp = xfs_incore(mp->m_ddev_targp, qip->qli_format.qlf_blkno,
 257                     XFS_QI_DQCHUNKLEN(mp),
 258                     XFS_INCORE_TRYLOCK);
 259         if (bp != NULL) {
 260                 if (XFS_BUF_ISDELAYWRITE(bp)) {
 261                         dopush = ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
 262                                   (valusema(&(dqp->q_flock)) <= 0));
 263                         qip->qli_pushbuf_flag = 0;
 264                         xfs_dqunlock(dqp);
 265
 266                         if (XFS_BUF_ISPINNED(bp)) {
 267                                 xfs_log_force(mp, (xfs_lsn_t)0,
 268                                               XFS_LOG_FORCE);
 269                         }
 270                         if (dopush) {
 271 #ifdef XFSRACEDEBUG
 272                                 delay_for_intr();
 273                                 delay(300);
 274 #endif
 275                                 xfs_bawrite(mp, bp);
 276                         } else {
 277                                 xfs_buf_relse(bp);
 278                         }
 279                 } else {
 280                         qip->qli_pushbuf_flag = 0;
 281                         xfs_dqunlock(dqp);
 282                         xfs_buf_relse(bp);
 283                 }
 284                 return;
 285         }
 286
 287         qip->qli_pushbuf_flag = 0;
 288         xfs_dqunlock(dqp);
 289 }
 290
 291 /*
 292  * This is called to attempt to lock the dquot associated with this
 293  * dquot log item.  Don't sleep on the dquot lock or the flush lock.
 294  * If the flush lock is already held, indicating that the dquot has
 295  * been or is in the process of being flushed, then see if we can
 296  * find the dquot's buffer in the buffer cache without sleeping.  If
 297  * we can and it is marked delayed write, then we want to send it out.
 298  * We delay doing so until the push routine, though, to avoid sleeping
 299  * in any device strategy routines.
 300  */
 301 STATIC uint
 302 xfs_qm_dquot_logitem_trylock(
 303         xfs_dq_logitem_t        *qip)
 304 {
 305         xfs_dquot_t             *dqp;
 306         uint                    retval;
 307
 308         dqp = qip->qli_dquot;
 309         if (dqp->q_pincount > 0)
 310                 return (XFS_ITEM_PINNED);
 311
 312         if (! xfs_qm_dqlock_nowait(dqp))
 313                 return (XFS_ITEM_LOCKED);
 314
 315         retval = XFS_ITEM_SUCCESS;
 316         if (! xfs_qm_dqflock_nowait(dqp)) {
 317                 /*
 318                  * The dquot is already being flushed.  It may have been
 319                  * flushed delayed write, however, and we don't want to
 320                  * get stuck waiting for that to complete.  So, we want to check
 321                  * to see if we can lock the dquot's buffer without sleeping.
 322                  * If we can and it is marked for delayed write, then we
 323                  * hold it and send it out from the push routine.  We don't
 324                  * want to do that now since we might sleep in the device
 325                  * strategy routine.  We also don't want to grab the buffer lock
 326                  * here because we'd like not to call into the buffer cache
 327                  * while holding the AIL_LOCK.
 328                  * Make sure to only return PUSHBUF if we set pushbuf_flag
 329                  * ourselves.  If someone else is doing it then we don't
 330                  * want to go to the push routine and duplicate their efforts.
 331                  */
 332                 if (qip->qli_pushbuf_flag == 0) {
 333                         qip->qli_pushbuf_flag = 1;
 334                         ASSERT(qip->qli_format.qlf_blkno == dqp->q_blkno);
 335 #ifdef DEBUG
 336                         qip->qli_push_owner = get_thread_id();
 337 #endif
 338                         /*
 339                          * The dquot is left locked.
 340                          */
 341                         retval = XFS_ITEM_PUSHBUF;
 342                 } else {
 343                         retval = XFS_ITEM_FLUSHING;
 344                         xfs_dqunlock_nonotify(dqp);
 345                 }
 346         }
 347
 348         ASSERT(qip->qli_item.li_flags & XFS_LI_IN_AIL);
 349         return (retval);
 350 }
 351
 352
 353 /*
 354  * Unlock the dquot associated with the log item.
 355  * Clear the fields of the dquot and dquot log item that
 356  * are specific to the current transaction.  If the
 357  * hold flags is set, do not unlock the dquot.
 358  */
 359 STATIC void
 360 xfs_qm_dquot_logitem_unlock(
 361         xfs_dq_logitem_t    *ql)
 362 {
 363         xfs_dquot_t     *dqp;
 364
 365         ASSERT(ql != NULL);
 366         dqp = ql->qli_dquot;
 367         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 368
 369         /*
 370          * Clear the transaction pointer in the dquot
 371          */
 372         dqp->q_transp = NULL;
 373
 374         /*
 375          * dquots are never 'held' from getting unlocked at the end of
 376          * a transaction.  Their locking and unlocking is hidden inside the
 377          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 378          * for the logitem.
 379          */
 380         xfs_dqunlock(dqp);
 381 }
 382
 383
 384 /*
 385  * The transaction with the dquot locked has aborted.  The dquot
 386  * must not be dirty within the transaction.  We simply unlock just
 387  * as if the transaction had been cancelled.
 388  */
 389 STATIC void
 390 xfs_qm_dquot_logitem_abort(
 391         xfs_dq_logitem_t    *ql)
 392 {
 393         xfs_qm_dquot_logitem_unlock(ql);
 394 }
 395
 396 /*
 397  * this needs to stamp an lsn into the dquot, I think.
 398  * rpc's that look at user dquot's would then have to
 399  * push on the dependency recorded in the dquot
 400  */
 401 /* ARGSUSED */
 402 STATIC void
 403 xfs_qm_dquot_logitem_committing(
 404         xfs_dq_logitem_t        *l,
 405         xfs_lsn_t               lsn)
 406 {
 407         return;
 408 }
 409
 410
 411 /*
 412  * This is the ops vector for dquots
 413  */
 414 STATIC struct xfs_item_ops xfs_dquot_item_ops = {
 415         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_size,
 416         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 417                                         xfs_qm_dquot_logitem_format,
 418         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
 419         .iop_unpin      = (void(*)(xfs_log_item_t*, int))
 420                                         xfs_qm_dquot_logitem_unpin,
 421         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 422                                         xfs_qm_dquot_logitem_unpin_remove,
 423         .iop_trylock    = (uint(*)(xfs_log_item_t*))
 424                                         xfs_qm_dquot_logitem_trylock,
 425         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unlock,
 426         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 427                                         xfs_qm_dquot_logitem_committed,
 428         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_push,
 429         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_abort,
 430         .iop_pushbuf    = (void(*)(xfs_log_item_t*))
 431                                         xfs_qm_dquot_logitem_pushbuf,
 432         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 433                                         xfs_qm_dquot_logitem_committing
 434 };
 435
 436 /*
 437  * Initialize the dquot log item for a newly allocated dquot.
 438  * The dquot isn't locked at this point, but it isn't on any of the lists
 439  * either, so we don't care.
 440  */
 441 void
 442 xfs_qm_dquot_logitem_init(
 443         struct xfs_dquot *dqp)
 444 {
 445         xfs_dq_logitem_t  *lp;
 446         lp = &dqp->q_logitem;
 447
 448         lp->qli_item.li_type = XFS_LI_DQUOT;
 449         lp->qli_item.li_ops = &xfs_dquot_item_ops;
 450         lp->qli_item.li_mountp = dqp->q_mount;
 451         lp->qli_dquot = dqp;
 452         lp->qli_format.qlf_type = XFS_LI_DQUOT;
 453         lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
 454         lp->qli_format.qlf_blkno = dqp->q_blkno;
 455         lp->qli_format.qlf_len = 1;
 456         /*
 457          * This is just the offset of this dquot within its buffer
 458          * (which is currently 1 FSB and probably won't change).
 459          * Hence 32 bits for this offset should be just fine.
 460          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
 461          * here, and recompute it at recovery time.
 462          */
 463         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
 464 }
 465
 466 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 467
 468 /*
 469  * This returns the number of iovecs needed to log the given quotaoff item.
 470  * We only need 1 iovec for an quotaoff item.  It just logs the
 471  * quotaoff_log_format structure.
 472  */
 473 /*ARGSUSED*/
 474 STATIC uint
 475 xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t *qf)
 476 {
 477         return (1);
 478 }
 479
 480 /*
 481  * This is called to fill in the vector of log iovecs for the
 482  * given quotaoff log item. We use only 1 iovec, and we point that
 483  * at the quotaoff_log_format structure embedded in the quotaoff item.
 484  * It is at this point that we assert that all of the extent
 485  * slots in the quotaoff item have been filled.
 486  */
 487 STATIC void
 488 xfs_qm_qoff_logitem_format(xfs_qoff_logitem_t   *qf,
 489                            xfs_log_iovec_t      *log_vector)
 490 {
 491         ASSERT(qf->qql_format.qf_type == XFS_LI_QUOTAOFF);
 492
 493         log_vector->i_addr = (xfs_caddr_t)&(qf->qql_format);
 494         log_vector->i_len = sizeof(xfs_qoff_logitem_t);
 495         XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_QUOTAOFF);
 496         qf->qql_format.qf_size = 1;
 497 }
 498
 499
 500 /*
 501  * Pinning has no meaning for an quotaoff item, so just return.
 502  */
 503 /*ARGSUSED*/
 504 STATIC void
 505 xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
 506 {
 507         return;
 508 }
 509
 510
 511 /*
 512  * Since pinning has no meaning for an quotaoff item, unpinning does
 513  * not either.
 514  */
 515 /*ARGSUSED*/
 516 STATIC void
 517 xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf, int stale)
 518 {
 519         return;
 520 }
 521
 522 /*ARGSUSED*/
 523 STATIC void
 524 xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t *qf, xfs_trans_t *tp)
 525 {
 526         return;
 527 }
 528
 529 /*
 530  * Quotaoff items have no locking, so just return success.
 531  */
 532 /*ARGSUSED*/
 533 STATIC uint
 534 xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t *qf)
 535 {
 536         return XFS_ITEM_LOCKED;
 537 }
 538
 539 /*
 540  * Quotaoff items have no locking or pushing, so return failure
 541  * so that the caller doesn't bother with us.
 542  */
 543 /*ARGSUSED*/
 544 STATIC void
 545 xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t *qf)
 546 {
 547         return;
 548 }
 549
 550 /*
 551  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 552  * so simply return the lsn at which it's been logged.
 553  */
 554 /*ARGSUSED*/
 555 STATIC xfs_lsn_t
 556 xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t *qf, xfs_lsn_t lsn)
 557 {
 558         return (lsn);
 559 }
 560
 561 /*
 562  * The transaction of which this QUOTAOFF is a part has been aborted.
 563  * Just clean up after ourselves.
 564  * Shouldn't this never happen in the case of qoffend logitems? XXX
 565  */
 566 STATIC void
 567 xfs_qm_qoff_logitem_abort(xfs_qoff_logitem_t *qf)
 568 {
 569         kmem_free(qf, sizeof(xfs_qoff_logitem_t));
 570 }
 571
 572 /*
 573  * There isn't much you can do to push on an quotaoff item.  It is simply
 574  * stuck waiting for the log to be flushed to disk.
 575  */
 576 /*ARGSUSED*/
 577 STATIC void
 578 xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t *qf)
 579 {
 580         return;
 581 }
 582
 583
 584 /*ARGSUSED*/
 585 STATIC xfs_lsn_t
 586 xfs_qm_qoffend_logitem_committed(
 587         xfs_qoff_logitem_t *qfe,
 588         xfs_lsn_t lsn)
 589 {
 590         xfs_qoff_logitem_t      *qfs;
 591         SPLDECL(s);
 592
 593         qfs = qfe->qql_start_lip;
 594         AIL_LOCK(qfs->qql_item.li_mountp,s);
 595         /*
 596          * Delete the qoff-start logitem from the AIL.
 597          * xfs_trans_delete_ail() drops the AIL lock.
 598          */
 599         xfs_trans_delete_ail(qfs->qql_item.li_mountp, (xfs_log_item_t *)qfs, s);
 600         kmem_free(qfs, sizeof(xfs_qoff_logitem_t));
 601         kmem_free(qfe, sizeof(xfs_qoff_logitem_t));
 602         return (xfs_lsn_t)-1;
 603 }
 604
 605 /*
 606  * XXX rcc - don't know quite what to do with this.  I think we can
 607  * just ignore it.  The only time that isn't the case is if we allow
 608  * the client to somehow see that quotas have been turned off in which
 609  * we can't allow that to get back until the quotaoff hits the disk.
 610  * So how would that happen?  Also, do we need different routines for
 611  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 612  * to be sure, I need to look at the recovery code and see how quota off
 613  * recovery is handled (do we roll forward or back or do something else).
 614  * If we roll forwards or backwards, then we need two separate routines,
 615  * one that does nothing and one that stamps in the lsn that matters
 616  * (truly makes the quotaoff irrevocable).  If we do something else,
 617  * then maybe we don't need two.
 618  */
 619 /* ARGSUSED */
 620 STATIC void
 621 xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
 622 {
 623         return;
 624 }
 625
 626 /* ARGSUSED */
 627 STATIC void
 628 xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
 629 {
 630         return;
 631 }
 632
 633 STATIC struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 634         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
 635         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 636                                         xfs_qm_qoff_logitem_format,
 637         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
 638         .iop_unpin      = (void(*)(xfs_log_item_t* ,int))
 639                                         xfs_qm_qoff_logitem_unpin,
 640         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
 641                                         xfs_qm_qoff_logitem_unpin_remove,
 642         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
 643         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
 644         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 645                                         xfs_qm_qoffend_logitem_committed,
 646         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
 647         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
 648         .iop_pushbuf    = NULL,
 649         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 650                                         xfs_qm_qoffend_logitem_committing
 651 };
 652
 653 /*
 654  * This is the ops vector shared by all quotaoff-start log items.
 655  */
 656 STATIC struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 657         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
 658         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 659                                         xfs_qm_qoff_logitem_format,
 660         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
 661         .iop_unpin      = (void(*)(xfs_log_item_t*, int))
 662                                         xfs_qm_qoff_logitem_unpin,
 663         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
 664                                         xfs_qm_qoff_logitem_unpin_remove,
 665         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
 666         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
 667         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 668                                         xfs_qm_qoff_logitem_committed,
 669         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
 670         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
 671         .iop_pushbuf    = NULL,
 672         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 673                                         xfs_qm_qoff_logitem_committing
 674 };
 675
 676 /*
 677  * Allocate and initialize an quotaoff item of the correct quota type(s).
 678  */
 679 xfs_qoff_logitem_t *
 680 xfs_qm_qoff_logitem_init(
 681         struct xfs_mount *mp,
 682         xfs_qoff_logitem_t *start,
 683         uint flags)
 684 {
 685         xfs_qoff_logitem_t      *qf;
 686
 687         qf = (xfs_qoff_logitem_t*) kmem_zalloc(sizeof(xfs_qoff_logitem_t), KM_SLEEP);
 688
 689         qf->qql_item.li_type = XFS_LI_QUOTAOFF;
 690         if (start)
 691                 qf->qql_item.li_ops = &xfs_qm_qoffend_logitem_ops;
 692         else
 693                 qf->qql_item.li_ops = &xfs_qm_qoff_logitem_ops;
 694         qf->qql_item.li_mountp = mp;
 695         qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
 696         qf->qql_format.qf_flags = flags;
 697         qf->qql_start_lip = start;
 698         return (qf);
 699 }