fs/xfs/quota/xfs_dquot_item.c

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include "xfs.h"
  34 #include "xfs_fs.h"
  35 #include "xfs_inum.h"
  36 #include "xfs_log.h"
  37 #include "xfs_trans.h"
  38 #include "xfs_sb.h"
  39 #include "xfs_ag.h"
  40 #include "xfs_dir.h"
  41 #include "xfs_dir2.h"
  42 #include "xfs_alloc.h"
  43 #include "xfs_dmapi.h"
  44 #include "xfs_quota.h"
  45 #include "xfs_mount.h"
  46 #include "xfs_alloc_btree.h"
  47 #include "xfs_bmap_btree.h"
  48 #include "xfs_ialloc_btree.h"
  49 #include "xfs_btree.h"
  50 #include "xfs_ialloc.h"
  51 #include "xfs_attr_sf.h"
  52 #include "xfs_dir_sf.h"
  53 #include "xfs_dir2_sf.h"
  54 #include "xfs_dinode.h"
  55 #include "xfs_inode.h"
  56 #include "xfs_bmap.h"
  57 #include "xfs_bit.h"
  58 #include "xfs_rtalloc.h"
  59 #include "xfs_error.h"
  60 #include "xfs_itable.h"
  61 #include "xfs_rw.h"
  62 #include "xfs_acl.h"
  63 #include "xfs_cap.h"
  64 #include "xfs_mac.h"
  65 #include "xfs_attr.h"
  66 #include "xfs_buf_item.h"
  67 #include "xfs_trans_priv.h"
  68
  69 #include "xfs_qm.h"
  70
  71
  72 /*
  73  * returns the number of iovecs needed to log the given dquot item.
  74  */
  75 /* ARGSUSED */
  76 STATIC uint
  77 xfs_qm_dquot_logitem_size(
  78         xfs_dq_logitem_t        *logitem)
  79 {
  80         /*
  81          * we need only two iovecs, one for the format, one for the real thing
  82          */
  83         return (2);
  84 }
  85
  86 /*
  87  * fills in the vector of log iovecs for the given dquot log item.
  88  */
  89 STATIC void
  90 xfs_qm_dquot_logitem_format(
  91         xfs_dq_logitem_t        *logitem,
  92         xfs_log_iovec_t         *logvec)
  93 {
  94         ASSERT(logitem);
  95         ASSERT(logitem->qli_dquot);
  96
  97         logvec->i_addr = (xfs_caddr_t)&logitem->qli_format;
  98         logvec->i_len  = sizeof(xfs_dq_logformat_t);
  99         logvec++;
 100         logvec->i_addr = (xfs_caddr_t)&logitem->qli_dquot->q_core;
 101         logvec->i_len  = sizeof(xfs_disk_dquot_t);
 102
 103         ASSERT(2 == logitem->qli_item.li_desc->lid_size);
 104         logitem->qli_format.qlf_size = 2;
 105
 106 }
 107
 108 /*
 109  * Increment the pin count of the given dquot.
 110  * This value is protected by pinlock spinlock in the xQM structure.
 111  */
 112 STATIC void
 113 xfs_qm_dquot_logitem_pin(
 114         xfs_dq_logitem_t *logitem)
 115 {
 116         unsigned long   s;
 117         xfs_dquot_t *dqp;
 118
 119         dqp = logitem->qli_dquot;
 120         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 121         s = XFS_DQ_PINLOCK(dqp);
 122         dqp->q_pincount++;
 123         XFS_DQ_PINUNLOCK(dqp, s);
 124 }
 125
 126 /*
 127  * Decrement the pin count of the given dquot, and wake up
 128  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
 129  * dquot must have been previously pinned with a call to xfs_dqpin().
 130  */
 131 /* ARGSUSED */
 132 STATIC void
 133 xfs_qm_dquot_logitem_unpin(
 134         xfs_dq_logitem_t *logitem,
 135         int               stale)
 136 {
 137         unsigned long   s;
 138         xfs_dquot_t *dqp;
 139
 140         dqp = logitem->qli_dquot;
 141         ASSERT(dqp->q_pincount > 0);
 142         s = XFS_DQ_PINLOCK(dqp);
 143         dqp->q_pincount--;
 144         if (dqp->q_pincount == 0) {
 145                 sv_broadcast(&dqp->q_pinwait);
 146         }
 147         XFS_DQ_PINUNLOCK(dqp, s);
 148 }
 149
 150 /* ARGSUSED */
 151 STATIC void
 152 xfs_qm_dquot_logitem_unpin_remove(
 153         xfs_dq_logitem_t *logitem,
 154         xfs_trans_t      *tp)
 155 {
 156         xfs_qm_dquot_logitem_unpin(logitem, 0);
 157 }
 158
 159 /*
 160  * Given the logitem, this writes the corresponding dquot entry to disk
 161  * asynchronously. This is called with the dquot entry securely locked;
 162  * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
 163  * at the end.
 164  */
 165 STATIC void
 166 xfs_qm_dquot_logitem_push(
 167         xfs_dq_logitem_t        *logitem)
 168 {
 169         xfs_dquot_t     *dqp;
 170
 171         dqp = logitem->qli_dquot;
 172
 173         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 174         ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp));
 175
 176         /*
 177          * Since we were able to lock the dquot's flush lock and
 178          * we found it on the AIL, the dquot must be dirty.  This
 179          * is because the dquot is removed from the AIL while still
 180          * holding the flush lock in xfs_dqflush_done().  Thus, if
 181          * we found it in the AIL and were able to obtain the flush
 182          * lock without sleeping, then there must not have been
 183          * anyone in the process of flushing the dquot.
 184          */
 185         xfs_qm_dqflush(dqp, XFS_B_DELWRI);
 186         xfs_dqunlock(dqp);
 187 }
 188
 189 /*ARGSUSED*/
 190 STATIC xfs_lsn_t
 191 xfs_qm_dquot_logitem_committed(
 192         xfs_dq_logitem_t        *l,
 193         xfs_lsn_t               lsn)
 194 {
 195         /*
 196          * We always re-log the entire dquot when it becomes dirty,
 197          * so, the latest copy _is_ the only one that matters.
 198          */
 199         return (lsn);
 200 }
 201
 202
 203 /*
 204  * This is called to wait for the given dquot to be unpinned.
 205  * Most of these pin/unpin routines are plagiarized from inode code.
 206  */
 207 void
 208 xfs_qm_dqunpin_wait(
 209         xfs_dquot_t     *dqp)
 210 {
 211         SPLDECL(s);
 212
 213         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 214         if (dqp->q_pincount == 0) {
 215                 return;
 216         }
 217
 218         /*
 219          * Give the log a push so we don't wait here too long.
 220          */
 221         xfs_log_force(dqp->q_mount, (xfs_lsn_t)0, XFS_LOG_FORCE);
 222         s = XFS_DQ_PINLOCK(dqp);
 223         if (dqp->q_pincount == 0) {
 224                 XFS_DQ_PINUNLOCK(dqp, s);
 225                 return;
 226         }
 227         sv_wait(&(dqp->q_pinwait), PINOD,
 228                 &(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s);
 229 }
 230
 231 /*
 232  * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
 233  * the dquot is locked by us, but the flush lock isn't. So, here we are
 234  * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
 235  * If so, we want to push it out to help us take this item off the AIL as soon
 236  * as possible.
 237  *
 238  * We must not be holding the AIL_LOCK at this point. Calling incore() to
 239  * search the buffercache can be a time consuming thing, and AIL_LOCK is a
 240  * spinlock.
 241  */
 242 STATIC void
 243 xfs_qm_dquot_logitem_pushbuf(
 244         xfs_dq_logitem_t    *qip)
 245 {
 246         xfs_dquot_t     *dqp;
 247         xfs_mount_t     *mp;
 248         xfs_buf_t       *bp;
 249         uint            dopush;
 250
 251         dqp = qip->qli_dquot;
 252         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 253
 254         /*
 255          * The qli_pushbuf_flag keeps others from
 256          * trying to duplicate our effort.
 257          */
 258         ASSERT(qip->qli_pushbuf_flag != 0);
 259         ASSERT(qip->qli_push_owner == get_thread_id());
 260
 261         /*
 262          * If flushlock isn't locked anymore, chances are that the
 263          * inode flush completed and the inode was taken off the AIL.
 264          * So, just get out.
 265          */
 266         if ((valusema(&(dqp->q_flock)) > 0)  ||
 267             ((qip->qli_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 268                 qip->qli_pushbuf_flag = 0;
 269                 xfs_dqunlock(dqp);
 270                 return;
 271         }
 272         mp = dqp->q_mount;
 273         bp = xfs_incore(mp->m_ddev_targp, qip->qli_format.qlf_blkno,
 274                     XFS_QI_DQCHUNKLEN(mp),
 275                     XFS_INCORE_TRYLOCK);
 276         if (bp != NULL) {
 277                 if (XFS_BUF_ISDELAYWRITE(bp)) {
 278                         dopush = ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
 279                                   (valusema(&(dqp->q_flock)) <= 0));
 280                         qip->qli_pushbuf_flag = 0;
 281                         xfs_dqunlock(dqp);
 282
 283                         if (XFS_BUF_ISPINNED(bp)) {
 284                                 xfs_log_force(mp, (xfs_lsn_t)0,
 285                                               XFS_LOG_FORCE);
 286                         }
 287                         if (dopush) {
 288 #ifdef XFSRACEDEBUG
 289                                 delay_for_intr();
 290                                 delay(300);
 291 #endif
 292                                 xfs_bawrite(mp, bp);
 293                         } else {
 294                                 xfs_buf_relse(bp);
 295                         }
 296                 } else {
 297                         qip->qli_pushbuf_flag = 0;
 298                         xfs_dqunlock(dqp);
 299                         xfs_buf_relse(bp);
 300                 }
 301                 return;
 302         }
 303
 304         qip->qli_pushbuf_flag = 0;
 305         xfs_dqunlock(dqp);
 306 }
 307
 308 /*
 309  * This is called to attempt to lock the dquot associated with this
 310  * dquot log item.  Don't sleep on the dquot lock or the flush lock.
 311  * If the flush lock is already held, indicating that the dquot has
 312  * been or is in the process of being flushed, then see if we can
 313  * find the dquot's buffer in the buffer cache without sleeping.  If
 314  * we can and it is marked delayed write, then we want to send it out.
 315  * We delay doing so until the push routine, though, to avoid sleeping
 316  * in any device strategy routines.
 317  */
 318 STATIC uint
 319 xfs_qm_dquot_logitem_trylock(
 320         xfs_dq_logitem_t        *qip)
 321 {
 322         xfs_dquot_t             *dqp;
 323         uint                    retval;
 324
 325         dqp = qip->qli_dquot;
 326         if (dqp->q_pincount > 0)
 327                 return (XFS_ITEM_PINNED);
 328
 329         if (! xfs_qm_dqlock_nowait(dqp))
 330                 return (XFS_ITEM_LOCKED);
 331
 332         retval = XFS_ITEM_SUCCESS;
 333         if (! xfs_qm_dqflock_nowait(dqp)) {
 334                 /*
 335                  * The dquot is already being flushed.  It may have been
 336                  * flushed delayed write, however, and we don't want to
 337                  * get stuck waiting for that to complete.  So, we want to check
 338                  * to see if we can lock the dquot's buffer without sleeping.
 339                  * If we can and it is marked for delayed write, then we
 340                  * hold it and send it out from the push routine.  We don't
 341                  * want to do that now since we might sleep in the device
 342                  * strategy routine.  We also don't want to grab the buffer lock
 343                  * here because we'd like not to call into the buffer cache
 344                  * while holding the AIL_LOCK.
 345                  * Make sure to only return PUSHBUF if we set pushbuf_flag
 346                  * ourselves.  If someone else is doing it then we don't
 347                  * want to go to the push routine and duplicate their efforts.
 348                  */
 349                 if (qip->qli_pushbuf_flag == 0) {
 350                         qip->qli_pushbuf_flag = 1;
 351                         ASSERT(qip->qli_format.qlf_blkno == dqp->q_blkno);
 352 #ifdef DEBUG
 353                         qip->qli_push_owner = get_thread_id();
 354 #endif
 355                         /*
 356                          * The dquot is left locked.
 357                          */
 358                         retval = XFS_ITEM_PUSHBUF;
 359                 } else {
 360                         retval = XFS_ITEM_FLUSHING;
 361                         xfs_dqunlock_nonotify(dqp);
 362                 }
 363         }
 364
 365         ASSERT(qip->qli_item.li_flags & XFS_LI_IN_AIL);
 366         return (retval);
 367 }
 368
 369
 370 /*
 371  * Unlock the dquot associated with the log item.
 372  * Clear the fields of the dquot and dquot log item that
 373  * are specific to the current transaction.  If the
 374  * hold flags is set, do not unlock the dquot.
 375  */
 376 STATIC void
 377 xfs_qm_dquot_logitem_unlock(
 378         xfs_dq_logitem_t    *ql)
 379 {
 380         xfs_dquot_t     *dqp;
 381
 382         ASSERT(ql != NULL);
 383         dqp = ql->qli_dquot;
 384         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 385
 386         /*
 387          * Clear the transaction pointer in the dquot
 388          */
 389         dqp->q_transp = NULL;
 390
 391         /*
 392          * dquots are never 'held' from getting unlocked at the end of
 393          * a transaction.  Their locking and unlocking is hidden inside the
 394          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 395          * for the logitem.
 396          */
 397         xfs_dqunlock(dqp);
 398 }
 399
 400
 401 /*
 402  * The transaction with the dquot locked has aborted.  The dquot
 403  * must not be dirty within the transaction.  We simply unlock just
 404  * as if the transaction had been cancelled.
 405  */
 406 STATIC void
 407 xfs_qm_dquot_logitem_abort(
 408         xfs_dq_logitem_t    *ql)
 409 {
 410         xfs_qm_dquot_logitem_unlock(ql);
 411 }
 412
 413 /*
 414  * this needs to stamp an lsn into the dquot, I think.
 415  * rpc's that look at user dquot's would then have to
 416  * push on the dependency recorded in the dquot
 417  */
 418 /* ARGSUSED */
 419 STATIC void
 420 xfs_qm_dquot_logitem_committing(
 421         xfs_dq_logitem_t        *l,
 422         xfs_lsn_t               lsn)
 423 {
 424         return;
 425 }
 426
 427
 428 /*
 429  * This is the ops vector for dquots
 430  */
 431 struct xfs_item_ops xfs_dquot_item_ops = {
 432         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_size,
 433         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 434                                         xfs_qm_dquot_logitem_format,
 435         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
 436         .iop_unpin      = (void(*)(xfs_log_item_t*, int))
 437                                         xfs_qm_dquot_logitem_unpin,
 438         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 439                                         xfs_qm_dquot_logitem_unpin_remove,
 440         .iop_trylock    = (uint(*)(xfs_log_item_t*))
 441                                         xfs_qm_dquot_logitem_trylock,
 442         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unlock,
 443         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 444                                         xfs_qm_dquot_logitem_committed,
 445         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_push,
 446         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_abort,
 447         .iop_pushbuf    = (void(*)(xfs_log_item_t*))
 448                                         xfs_qm_dquot_logitem_pushbuf,
 449         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 450                                         xfs_qm_dquot_logitem_committing
 451 };
 452
 453 /*
 454  * Initialize the dquot log item for a newly allocated dquot.
 455  * The dquot isn't locked at this point, but it isn't on any of the lists
 456  * either, so we don't care.
 457  */
 458 void
 459 xfs_qm_dquot_logitem_init(
 460         struct xfs_dquot *dqp)
 461 {
 462         xfs_dq_logitem_t  *lp;
 463         lp = &dqp->q_logitem;
 464
 465         lp->qli_item.li_type = XFS_LI_DQUOT;
 466         lp->qli_item.li_ops = &xfs_dquot_item_ops;
 467         lp->qli_item.li_mountp = dqp->q_mount;
 468         lp->qli_dquot = dqp;
 469         lp->qli_format.qlf_type = XFS_LI_DQUOT;
 470         lp->qli_format.qlf_id = INT_GET(dqp->q_core.d_id, ARCH_CONVERT);
 471         lp->qli_format.qlf_blkno = dqp->q_blkno;
 472         lp->qli_format.qlf_len = 1;
 473         /*
 474          * This is just the offset of this dquot within its buffer
 475          * (which is currently 1 FSB and probably won't change).
 476          * Hence 32 bits for this offset should be just fine.
 477          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
 478          * here, and recompute it at recovery time.
 479          */
 480         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
 481 }
 482
 483 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 484
 485 /*
 486  * This returns the number of iovecs needed to log the given quotaoff item.
 487  * We only need 1 iovec for an quotaoff item.  It just logs the
 488  * quotaoff_log_format structure.
 489  */
 490 /*ARGSUSED*/
 491 STATIC uint
 492 xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t *qf)
 493 {
 494         return (1);
 495 }
 496
 497 /*
 498  * This is called to fill in the vector of log iovecs for the
 499  * given quotaoff log item. We use only 1 iovec, and we point that
 500  * at the quotaoff_log_format structure embedded in the quotaoff item.
 501  * It is at this point that we assert that all of the extent
 502  * slots in the quotaoff item have been filled.
 503  */
 504 STATIC void
 505 xfs_qm_qoff_logitem_format(xfs_qoff_logitem_t   *qf,
 506                            xfs_log_iovec_t      *log_vector)
 507 {
 508         ASSERT(qf->qql_format.qf_type == XFS_LI_QUOTAOFF);
 509
 510         log_vector->i_addr = (xfs_caddr_t)&(qf->qql_format);
 511         log_vector->i_len = sizeof(xfs_qoff_logitem_t);
 512         qf->qql_format.qf_size = 1;
 513 }
 514
 515
 516 /*
 517  * Pinning has no meaning for an quotaoff item, so just return.
 518  */
 519 /*ARGSUSED*/
 520 STATIC void
 521 xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
 522 {
 523         return;
 524 }
 525
 526
 527 /*
 528  * Since pinning has no meaning for an quotaoff item, unpinning does
 529  * not either.
 530  */
 531 /*ARGSUSED*/
 532 STATIC void
 533 xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf, int stale)
 534 {
 535         return;
 536 }
 537
 538 /*ARGSUSED*/
 539 STATIC void
 540 xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t *qf, xfs_trans_t *tp)
 541 {
 542         return;
 543 }
 544
 545 /*
 546  * Quotaoff items have no locking, so just return success.
 547  */
 548 /*ARGSUSED*/
 549 STATIC uint
 550 xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t *qf)
 551 {
 552         return XFS_ITEM_LOCKED;
 553 }
 554
 555 /*
 556  * Quotaoff items have no locking or pushing, so return failure
 557  * so that the caller doesn't bother with us.
 558  */
 559 /*ARGSUSED*/
 560 STATIC void
 561 xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t *qf)
 562 {
 563         return;
 564 }
 565
 566 /*
 567  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 568  * so simply return the lsn at which it's been logged.
 569  */
 570 /*ARGSUSED*/
 571 STATIC xfs_lsn_t
 572 xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t *qf, xfs_lsn_t lsn)
 573 {
 574         return (lsn);
 575 }
 576
 577 /*
 578  * The transaction of which this QUOTAOFF is a part has been aborted.
 579  * Just clean up after ourselves.
 580  * Shouldn't this never happen in the case of qoffend logitems? XXX
 581  */
 582 STATIC void
 583 xfs_qm_qoff_logitem_abort(xfs_qoff_logitem_t *qf)
 584 {
 585         kmem_free(qf, sizeof(xfs_qoff_logitem_t));
 586 }
 587
 588 /*
 589  * There isn't much you can do to push on an quotaoff item.  It is simply
 590  * stuck waiting for the log to be flushed to disk.
 591  */
 592 /*ARGSUSED*/
 593 STATIC void
 594 xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t *qf)
 595 {
 596         return;
 597 }
 598
 599
 600 /*ARGSUSED*/
 601 STATIC xfs_lsn_t
 602 xfs_qm_qoffend_logitem_committed(
 603         xfs_qoff_logitem_t *qfe,
 604         xfs_lsn_t lsn)
 605 {
 606         xfs_qoff_logitem_t      *qfs;
 607         SPLDECL(s);
 608
 609         qfs = qfe->qql_start_lip;
 610         AIL_LOCK(qfs->qql_item.li_mountp,s);
 611         /*
 612          * Delete the qoff-start logitem from the AIL.
 613          * xfs_trans_delete_ail() drops the AIL lock.
 614          */
 615         xfs_trans_delete_ail(qfs->qql_item.li_mountp, (xfs_log_item_t *)qfs, s);
 616         kmem_free(qfs, sizeof(xfs_qoff_logitem_t));
 617         kmem_free(qfe, sizeof(xfs_qoff_logitem_t));
 618         return (xfs_lsn_t)-1;
 619 }
 620
 621 /*
 622  * XXX rcc - don't know quite what to do with this.  I think we can
 623  * just ignore it.  The only time that isn't the case is if we allow
 624  * the client to somehow see that quotas have been turned off in which
 625  * we can't allow that to get back until the quotaoff hits the disk.
 626  * So how would that happen?  Also, do we need different routines for
 627  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 628  * to be sure, I need to look at the recovery code and see how quota off
 629  * recovery is handled (do we roll forward or back or do something else).
 630  * If we roll forwards or backwards, then we need two separate routines,
 631  * one that does nothing and one that stamps in the lsn that matters
 632  * (truly makes the quotaoff irrevocable).  If we do something else,
 633  * then maybe we don't need two.
 634  */
 635 /* ARGSUSED */
 636 STATIC void
 637 xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
 638 {
 639         return;
 640 }
 641
 642 /* ARGSUSED */
 643 STATIC void
 644 xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
 645 {
 646         return;
 647 }
 648
 649 struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 650         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
 651         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 652                                         xfs_qm_qoff_logitem_format,
 653         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
 654         .iop_unpin      = (void(*)(xfs_log_item_t* ,int))
 655                                         xfs_qm_qoff_logitem_unpin,
 656         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
 657                                         xfs_qm_qoff_logitem_unpin_remove,
 658         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
 659         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
 660         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 661                                         xfs_qm_qoffend_logitem_committed,
 662         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
 663         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
 664         .iop_pushbuf    = NULL,
 665         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 666                                         xfs_qm_qoffend_logitem_committing
 667 };
 668
 669 /*
 670  * This is the ops vector shared by all quotaoff-start log items.
 671  */
 672 struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 673         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
 674         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 675                                         xfs_qm_qoff_logitem_format,
 676         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
 677         .iop_unpin      = (void(*)(xfs_log_item_t*, int))
 678                                         xfs_qm_qoff_logitem_unpin,
 679         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
 680                                         xfs_qm_qoff_logitem_unpin_remove,
 681         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
 682         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
 683         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 684                                         xfs_qm_qoff_logitem_committed,
 685         .iop_push       = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
 686         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
 687         .iop_pushbuf    = NULL,
 688         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 689                                         xfs_qm_qoff_logitem_committing
 690 };
 691
 692 /*
 693  * Allocate and initialize an quotaoff item of the correct quota type(s).
 694  */
 695 xfs_qoff_logitem_t *
 696 xfs_qm_qoff_logitem_init(
 697         struct xfs_mount *mp,
 698         xfs_qoff_logitem_t *start,
 699         uint flags)
 700 {
 701         xfs_qoff_logitem_t      *qf;
 702
 703         qf = (xfs_qoff_logitem_t*) kmem_zalloc(sizeof(xfs_qoff_logitem_t), KM_SLEEP);
 704
 705         qf->qql_item.li_type = XFS_LI_QUOTAOFF;
 706         if (start)
 707                 qf->qql_item.li_ops = &xfs_qm_qoffend_logitem_ops;
 708         else
 709                 qf->qql_item.li_ops = &xfs_qm_qoff_logitem_ops;
 710         qf->qql_item.li_mountp = mp;
 711         qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
 712         qf->qql_format.qf_flags = flags;
 713         qf->qql_start_lip = start;
 714         return (qf);
 715 }