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         XLOG_VEC_SET_TYPE(logvec, XLOG_REG_TYPE_QFORMAT);
  83         logvec++;
  84         logvec->i_addr = (xfs_caddr_t)&logitem->qli_dquot->q_core;
  85         logvec->i_len  = sizeof(xfs_disk_dquot_t);
  86         XLOG_VEC_SET_TYPE(logvec, XLOG_REG_TYPE_DQUOT);
  87
  88         ASSERT(2 == logitem->qli_item.li_desc->lid_size);
  89         logitem->qli_format.qlf_size = 2;
  90
  91 }
  92
  93 /*
  94  * Increment the pin count of the given dquot.
  95  * This value is protected by pinlock spinlock in the xQM structure.
  96  */
  97 STATIC void
  98 xfs_qm_dquot_logitem_pin(
  99         xfs_dq_logitem_t *logitem)
 100 {
 101         unsigned long   s;
 102         xfs_dquot_t *dqp;
 103
 104         dqp = logitem->qli_dquot;
 105         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 106         s = XFS_DQ_PINLOCK(dqp);
 107         dqp->q_pincount++;
 108         XFS_DQ_PINUNLOCK(dqp, s);
 109 }
 110
 111 /*
 112  * Decrement the pin count of the given dquot, and wake up
 113  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
 114  * dquot must have been previously pinned with a call to xfs_dqpin().
 115  */
 116 /* ARGSUSED */
 117 STATIC void
 118 xfs_qm_dquot_logitem_unpin(
 119         xfs_dq_logitem_t *logitem,
 120         int               stale)
 121 {
 122         unsigned long   s;
 123         xfs_dquot_t *dqp;
 124
 125         dqp = logitem->qli_dquot;
 126         ASSERT(dqp->q_pincount > 0);
 127         s = XFS_DQ_PINLOCK(dqp);
 128         dqp->q_pincount--;
 129         if (dqp->q_pincount == 0) {
 130                 sv_broadcast(&dqp->q_pinwait);
 131         }
 132         XFS_DQ_PINUNLOCK(dqp, s);
 133 }
 134
 135 /* ARGSUSED */
 136 STATIC void
 137 xfs_qm_dquot_logitem_unpin_remove(
 138         xfs_dq_logitem_t *logitem,
 139         xfs_trans_t      *tp)
 140 {
 141         xfs_qm_dquot_logitem_unpin(logitem, 0);
 142 }
 143
 144 /*
 145  * Given the logitem, this writes the corresponding dquot entry to disk
 146  * asynchronously. This is called with the dquot entry securely locked;
 147  * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
 148  * at the end.
 149  */
 150 STATIC void
 151 xfs_qm_dquot_logitem_push(
 152         xfs_dq_logitem_t        *logitem)
 153 {
 154         xfs_dquot_t     *dqp;
 155
 156         dqp = logitem->qli_dquot;
 157
 158         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 159         ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp));
 160
 161         /*
 162          * Since we were able to lock the dquot's flush lock and
 163          * we found it on the AIL, the dquot must be dirty.  This
 164          * is because the dquot is removed from the AIL while still
 165          * holding the flush lock in xfs_dqflush_done().  Thus, if
 166          * we found it in the AIL and were able to obtain the flush
 167          * lock without sleeping, then there must not have been
 168          * anyone in the process of flushing the dquot.
 169          */
 170         xfs_qm_dqflush(dqp, XFS_B_DELWRI);
 171         xfs_dqunlock(dqp);
 172 }
 173
 174 /*ARGSUSED*/
 175 STATIC xfs_lsn_t
 176 xfs_qm_dquot_logitem_committed(
 177         xfs_dq_logitem_t        *l,
 178         xfs_lsn_t               lsn)
 179 {
 180         /*
 181          * We always re-log the entire dquot when it becomes dirty,
 182          * so, the latest copy _is_ the only one that matters.
 183          */
 184         return (lsn);
 185 }
 186
 187
 188 /*
 189  * This is called to wait for the given dquot to be unpinned.
 190  * Most of these pin/unpin routines are plagiarized from inode code.
 191  */
 192 void
 193 xfs_qm_dqunpin_wait(
 194         xfs_dquot_t     *dqp)
 195 {
 196         SPLDECL(s);
 197
 198         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 199         if (dqp->q_pincount == 0) {
 200                 return;
 201         }
 202
 203         /*
 204          * Give the log a push so we don't wait here too long.
 205          */
 206         xfs_log_force(dqp->q_mount, (xfs_lsn_t)0, XFS_LOG_FORCE);
 207         s = XFS_DQ_PINLOCK(dqp);
 208         if (dqp->q_pincount == 0) {
 209                 XFS_DQ_PINUNLOCK(dqp, s);
 210                 return;
 211         }
 212         sv_wait(&(dqp->q_pinwait), PINOD,
 213                 &(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s);
 214 }
 215
 216 /*
 217  * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
 218  * the dquot is locked by us, but the flush lock isn't. So, here we are
 219  * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
 220  * If so, we want to push it out to help us take this item off the AIL as soon
 221  * as possible.
 222  *
 223  * We must not be holding the AIL_LOCK at this point. Calling incore() to
 224  * search the buffer cache can be a time consuming thing, and AIL_LOCK is a
 225  * spinlock.
 226  */
 227 STATIC void
 228 xfs_qm_dquot_logitem_pushbuf(
 229         xfs_dq_logitem_t    *qip)
 230 {
 231         xfs_dquot_t     *dqp;
 232         xfs_mount_t     *mp;
 233         xfs_buf_t       *bp;
 234         uint            dopush;
 235
 236         dqp = qip->qli_dquot;
 237         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 238
 239         /*
 240          * The qli_pushbuf_flag keeps others from
 241          * trying to duplicate our effort.
 242          */
 243         ASSERT(qip->qli_pushbuf_flag != 0);
 244         ASSERT(qip->qli_push_owner == current_pid());
 245
 246         /*
 247          * If flushlock isn't locked anymore, chances are that the
 248          * inode flush completed and the inode was taken off the AIL.
 249          * So, just get out.
 250          */
 251         if ((valusema(&(dqp->q_flock)) > 0)  ||
 252             ((qip->qli_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 253                 qip->qli_pushbuf_flag = 0;
 254                 xfs_dqunlock(dqp);
 255                 return;
 256         }
 257         mp = dqp->q_mount;
 258         bp = xfs_incore(mp->m_ddev_targp, qip->qli_format.qlf_blkno,
 259                     XFS_QI_DQCHUNKLEN(mp),
 260                     XFS_INCORE_TRYLOCK);
 261         if (bp != NULL) {
 262                 if (XFS_BUF_ISDELAYWRITE(bp)) {
 263                         dopush = ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
 264                                   (valusema(&(dqp->q_flock)) <= 0));
 265                         qip->qli_pushbuf_flag = 0;
 266                         xfs_dqunlock(dqp);
 267
 268                         if (XFS_BUF_ISPINNED(bp)) {
 269                                 xfs_log_force(mp, (xfs_lsn_t)0,
 270                                               XFS_LOG_FORCE);
 271                         }
 272                         if (dopush) {
 273 #ifdef XFSRACEDEBUG
 274                                 delay_for_intr();
 275                                 delay(300);
 276 #endif
 277                                 xfs_bawrite(mp, bp);
 278                         } else {
 279                                 xfs_buf_relse(bp);
 280                         }
 281                 } else {
 282                         qip->qli_pushbuf_flag = 0;
 283                         xfs_dqunlock(dqp);
 284                         xfs_buf_relse(bp);
 285                 }
 286                 return;
 287         }
 288
 289         qip->qli_pushbuf_flag = 0;
 290         xfs_dqunlock(dqp);
 291 }
 292
 293 /*
 294  * This is called to attempt to lock the dquot associated with this
 295  * dquot log item.  Don't sleep on the dquot lock or the flush lock.
 296  * If the flush lock is already held, indicating that the dquot has
 297  * been or is in the process of being flushed, then see if we can
 298  * find the dquot's buffer in the buffer cache without sleeping.  If
 299  * we can and it is marked delayed write, then we want to send it out.
 300  * We delay doing so until the push routine, though, to avoid sleeping
 301  * in any device strategy routines.
 302  */
 303 STATIC uint
 304 xfs_qm_dquot_logitem_trylock(
 305         xfs_dq_logitem_t        *qip)
 306 {
 307         xfs_dquot_t             *dqp;
 308         uint                    retval;
 309
 310         dqp = qip->qli_dquot;
 311         if (dqp->q_pincount > 0)
 312                 return (XFS_ITEM_PINNED);
 313
 314         if (! xfs_qm_dqlock_nowait(dqp))
 315                 return (XFS_ITEM_LOCKED);
 316
 317         retval = XFS_ITEM_SUCCESS;
 318         if (! xfs_qm_dqflock_nowait(dqp)) {
 319                 /*
 320                  * The dquot is already being flushed.  It may have been
 321                  * flushed delayed write, however, and we don't want to
 322                  * get stuck waiting for that to complete.  So, we want to check
 323                  * to see if we can lock the dquot's buffer without sleeping.
 324                  * If we can and it is marked for delayed write, then we
 325                  * hold it and send it out from the push routine.  We don't
 326                  * want to do that now since we might sleep in the device
 327                  * strategy routine.  We also don't want to grab the buffer lock
 328                  * here because we'd like not to call into the buffer cache
 329                  * while holding the AIL_LOCK.
 330                  * Make sure to only return PUSHBUF if we set pushbuf_flag
 331                  * ourselves.  If someone else is doing it then we don't
 332                  * want to go to the push routine and duplicate their efforts.
 333                  */
 334                 if (qip->qli_pushbuf_flag == 0) {
 335                         qip->qli_pushbuf_flag = 1;
 336                         ASSERT(qip->qli_format.qlf_blkno == dqp->q_blkno);
 337 #ifdef DEBUG
 338                         qip->qli_push_owner = current_pid();
 339 #endif
 340                         /*
 341                          * The dquot is left locked.
 342                          */
 343                         retval = XFS_ITEM_PUSHBUF;
 344                 } else {
 345                         retval = XFS_ITEM_FLUSHING;
 346                         xfs_dqunlock_nonotify(dqp);
 347                 }
 348         }
 349
 350         ASSERT(qip->qli_item.li_flags & XFS_LI_IN_AIL);
 351         return (retval);
 352 }
 353
 354
 355 /*
 356  * Unlock the dquot associated with the log item.
 357  * Clear the fields of the dquot and dquot log item that
 358  * are specific to the current transaction.  If the
 359  * hold flags is set, do not unlock the dquot.
 360  */
 361 STATIC void
 362 xfs_qm_dquot_logitem_unlock(
 363         xfs_dq_logitem_t    *ql)
 364 {
 365         xfs_dquot_t     *dqp;
 366
 367         ASSERT(ql != NULL);
 368         dqp = ql->qli_dquot;
 369         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 370
 371         /*
 372          * Clear the transaction pointer in the dquot
 373          */
 374         dqp->q_transp = NULL;
 375
 376         /*
 377          * dquots are never 'held' from getting unlocked at the end of
 378          * a transaction.  Their locking and unlocking is hidden inside the
 379          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 380          * for the logitem.
 381          */
 382         xfs_dqunlock(dqp);
 383 }
 384
 385
 386 /*
 387  * The transaction with the dquot locked has aborted.  The dquot
 388  * must not be dirty within the transaction.  We simply unlock just
 389  * as if the transaction had been cancelled.
 390  */
 391 STATIC void
 392 xfs_qm_dquot_logitem_abort(
 393         xfs_dq_logitem_t    *ql)
 394 {
 395         xfs_qm_dquot_logitem_unlock(ql);
 396 }
 397
 398 /*
 399  * this needs to stamp an lsn into the dquot, I think.
 400  * rpc's that look at user dquot's would then have to
 401  * push on the dependency recorded in the dquot
 402  */
 403 /* ARGSUSED */
 404 STATIC void
 405 xfs_qm_dquot_logitem_committing(
 406         xfs_dq_logitem_t        *l,
 407         xfs_lsn_t               lsn)
 408 {
 409         return;
 410 }
 411
 412
 413 /*
 414  * This is the ops vector for dquots
 415  */
 416 STATIC struct xfs_item_ops xfs_dquot_item_ops = {
 417         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_size,
 418         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 419                                         xfs_qm_dquot_logitem_format,
 420         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
 421         .iop_unpin      = (void(*)(xfs_log_item_t*, int))
 422                                         xfs_qm_dquot_logitem_unpin,
 423         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 424                                         xfs_qm_dquot_logitem_unpin_remove,
 425         .iop_trylock    = (uint(*)(xfs_log_item_t*))
 426                                         xfs_qm_dquot_logitem_trylock,
 427         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unlock,
 428         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 429                                         xfs_qm_dquot_logitem_committed,
 430         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_push,
 431         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_abort,
 432         .iop_pushbuf    = (void(*)(xfs_log_item_t*))
 433                                         xfs_qm_dquot_logitem_pushbuf,
 434         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 435                                         xfs_qm_dquot_logitem_committing
 436 };
 437
 438 /*
 439  * Initialize the dquot log item for a newly allocated dquot.
 440  * The dquot isn't locked at this point, but it isn't on any of the lists
 441  * either, so we don't care.
 442  */
 443 void
 444 xfs_qm_dquot_logitem_init(
 445         struct xfs_dquot *dqp)
 446 {
 447         xfs_dq_logitem_t  *lp;
 448         lp = &dqp->q_logitem;
 449
 450         lp->qli_item.li_type = XFS_LI_DQUOT;
 451         lp->qli_item.li_ops = &xfs_dquot_item_ops;
 452         lp->qli_item.li_mountp = dqp->q_mount;
 453         lp->qli_dquot = dqp;
 454         lp->qli_format.qlf_type = XFS_LI_DQUOT;
 455         lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
 456         lp->qli_format.qlf_blkno = dqp->q_blkno;
 457         lp->qli_format.qlf_len = 1;
 458         /*
 459          * This is just the offset of this dquot within its buffer
 460          * (which is currently 1 FSB and probably won't change).
 461          * Hence 32 bits for this offset should be just fine.
 462          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
 463          * here, and recompute it at recovery time.
 464          */
 465         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
 466 }
 467
 468 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 469
 470 /*
 471  * This returns the number of iovecs needed to log the given quotaoff item.
 472  * We only need 1 iovec for an quotaoff item.  It just logs the
 473  * quotaoff_log_format structure.
 474  */
 475 /*ARGSUSED*/
 476 STATIC uint
 477 xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t *qf)
 478 {
 479         return (1);
 480 }
 481
 482 /*
 483  * This is called to fill in the vector of log iovecs for the
 484  * given quotaoff log item. We use only 1 iovec, and we point that
 485  * at the quotaoff_log_format structure embedded in the quotaoff item.
 486  * It is at this point that we assert that all of the extent
 487  * slots in the quotaoff item have been filled.
 488  */
 489 STATIC void
 490 xfs_qm_qoff_logitem_format(xfs_qoff_logitem_t   *qf,
 491                            xfs_log_iovec_t      *log_vector)
 492 {
 493         ASSERT(qf->qql_format.qf_type == XFS_LI_QUOTAOFF);
 494
 495         log_vector->i_addr = (xfs_caddr_t)&(qf->qql_format);
 496         log_vector->i_len = sizeof(xfs_qoff_logitem_t);
 497         XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_QUOTAOFF);
 498         qf->qql_format.qf_size = 1;
 499 }
 500
 501
 502 /*
 503  * Pinning has no meaning for an quotaoff item, so just return.
 504  */
 505 /*ARGSUSED*/
 506 STATIC void
 507 xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
 508 {
 509         return;
 510 }
 511
 512
 513 /*
 514  * Since pinning has no meaning for an quotaoff item, unpinning does
 515  * not either.
 516  */
 517 /*ARGSUSED*/
 518 STATIC void
 519 xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf, int stale)
 520 {
 521         return;
 522 }
 523
 524 /*ARGSUSED*/
 525 STATIC void
 526 xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t *qf, xfs_trans_t *tp)
 527 {
 528         return;
 529 }
 530
 531 /*
 532  * Quotaoff items have no locking, so just return success.
 533  */
 534 /*ARGSUSED*/
 535 STATIC uint
 536 xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t *qf)
 537 {
 538         return XFS_ITEM_LOCKED;
 539 }
 540
 541 /*
 542  * Quotaoff items have no locking or pushing, so return failure
 543  * so that the caller doesn't bother with us.
 544  */
 545 /*ARGSUSED*/
 546 STATIC void
 547 xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t *qf)
 548 {
 549         return;
 550 }
 551
 552 /*
 553  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 554  * so simply return the lsn at which it's been logged.
 555  */
 556 /*ARGSUSED*/
 557 STATIC xfs_lsn_t
 558 xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t *qf, xfs_lsn_t lsn)
 559 {
 560         return (lsn);
 561 }
 562
 563 /*
 564  * The transaction of which this QUOTAOFF is a part has been aborted.
 565  * Just clean up after ourselves.
 566  * Shouldn't this never happen in the case of qoffend logitems? XXX
 567  */
 568 STATIC void
 569 xfs_qm_qoff_logitem_abort(xfs_qoff_logitem_t *qf)
 570 {
 571         kmem_free(qf, sizeof(xfs_qoff_logitem_t));
 572 }
 573
 574 /*
 575  * There isn't much you can do to push on an quotaoff item.  It is simply
 576  * stuck waiting for the log to be flushed to disk.
 577  */
 578 /*ARGSUSED*/
 579 STATIC void
 580 xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t *qf)
 581 {
 582         return;
 583 }
 584
 585
 586 /*ARGSUSED*/
 587 STATIC xfs_lsn_t
 588 xfs_qm_qoffend_logitem_committed(
 589         xfs_qoff_logitem_t *qfe,
 590         xfs_lsn_t lsn)
 591 {
 592         xfs_qoff_logitem_t      *qfs;
 593         SPLDECL(s);
 594
 595         qfs = qfe->qql_start_lip;
 596         AIL_LOCK(qfs->qql_item.li_mountp,s);
 597         /*
 598          * Delete the qoff-start logitem from the AIL.
 599          * xfs_trans_delete_ail() drops the AIL lock.
 600          */
 601         xfs_trans_delete_ail(qfs->qql_item.li_mountp, (xfs_log_item_t *)qfs, s);
 602         kmem_free(qfs, sizeof(xfs_qoff_logitem_t));
 603         kmem_free(qfe, sizeof(xfs_qoff_logitem_t));
 604         return (xfs_lsn_t)-1;
 605 }
 606
 607 /*
 608  * XXX rcc - don't know quite what to do with this.  I think we can
 609  * just ignore it.  The only time that isn't the case is if we allow
 610  * the client to somehow see that quotas have been turned off in which
 611  * we can't allow that to get back until the quotaoff hits the disk.
 612  * So how would that happen?  Also, do we need different routines for
 613  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 614  * to be sure, I need to look at the recovery code and see how quota off
 615  * recovery is handled (do we roll forward or back or do something else).
 616  * If we roll forwards or backwards, then we need two separate routines,
 617  * one that does nothing and one that stamps in the lsn that matters
 618  * (truly makes the quotaoff irrevocable).  If we do something else,
 619  * then maybe we don't need two.
 620  */
 621 /* ARGSUSED */
 622 STATIC void
 623 xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
 624 {
 625         return;
 626 }
 627
 628 /* ARGSUSED */
 629 STATIC void
 630 xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
 631 {
 632         return;
 633 }
 634
 635 STATIC struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 636         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
 637         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 638                                         xfs_qm_qoff_logitem_format,
 639         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
 640         .iop_unpin      = (void(*)(xfs_log_item_t* ,int))
 641                                         xfs_qm_qoff_logitem_unpin,
 642         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
 643                                         xfs_qm_qoff_logitem_unpin_remove,
 644         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
 645         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
 646         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 647                                         xfs_qm_qoffend_logitem_committed,
 648         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
 649         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
 650         .iop_pushbuf    = NULL,
 651         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 652                                         xfs_qm_qoffend_logitem_committing
 653 };
 654
 655 /*
 656  * This is the ops vector shared by all quotaoff-start log items.
 657  */
 658 STATIC struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 659         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
 660         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 661                                         xfs_qm_qoff_logitem_format,
 662         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
 663         .iop_unpin      = (void(*)(xfs_log_item_t*, int))
 664                                         xfs_qm_qoff_logitem_unpin,
 665         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
 666                                         xfs_qm_qoff_logitem_unpin_remove,
 667         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
 668         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
 669         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 670                                         xfs_qm_qoff_logitem_committed,
 671         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
 672         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
 673         .iop_pushbuf    = NULL,
 674         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 675                                         xfs_qm_qoff_logitem_committing
 676 };
 677
 678 /*
 679  * Allocate and initialize an quotaoff item of the correct quota type(s).
 680  */
 681 xfs_qoff_logitem_t *
 682 xfs_qm_qoff_logitem_init(
 683         struct xfs_mount *mp,
 684         xfs_qoff_logitem_t *start,
 685         uint flags)
 686 {
 687         xfs_qoff_logitem_t      *qf;
 688
 689         qf = (xfs_qoff_logitem_t*) kmem_zalloc(sizeof(xfs_qoff_logitem_t), KM_SLEEP);
 690
 691         qf->qql_item.li_type = XFS_LI_QUOTAOFF;
 692         if (start)
 693                 qf->qql_item.li_ops = &xfs_qm_qoffend_logitem_ops;
 694         else
 695                 qf->qql_item.li_ops = &xfs_qm_qoff_logitem_ops;
 696         qf->qql_item.li_mountp = mp;
 697         qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
 698         qf->qql_format.qf_flags = flags;
 699         qf->qql_start_lip = start;
 700         return (qf);
 701 }