summaryrefslogtreecommitdiffstats
path: root/fs/xfs/quota/xfs_dquot_item.c
blob: 546f48af882ae306cb2a5d52949db1e32bd1bf39 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
/*
 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_cap.h"
#include "xfs_mac.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_trans_priv.h"
#include "xfs_qm.h"

/*
 * returns the number of iovecs needed to log the given dquot item.
 */
/* ARGSUSED */
STATIC uint
xfs_qm_dquot_logitem_size(
	xfs_dq_logitem_t	*logitem)
{
	/*
	 * we need only two iovecs, one for the format, one for the real thing
	 */
	return (2);
}

/*
 * fills in the vector of log iovecs for the given dquot log item.
 */
STATIC void
xfs_qm_dquot_logitem_format(
	xfs_dq_logitem_t	*logitem,
	xfs_log_iovec_t		*logvec)
{
	ASSERT(logitem);
	ASSERT(logitem->qli_dquot);

	logvec->i_addr = (xfs_caddr_t)&logitem->qli_format;
	logvec->i_len  = sizeof(xfs_dq_logformat_t);
	XLOG_VEC_SET_TYPE(logvec, XLOG_REG_TYPE_QFORMAT);
	logvec++;
	logvec->i_addr = (xfs_caddr_t)&logitem->qli_dquot->q_core;
	logvec->i_len  = sizeof(xfs_disk_dquot_t);
	XLOG_VEC_SET_TYPE(logvec, XLOG_REG_TYPE_DQUOT);

	ASSERT(2 == logitem->qli_item.li_desc->lid_size);
	logitem->qli_format.qlf_size = 2;

}

/*
 * Increment the pin count of the given dquot.
 * This value is protected by pinlock spinlock in the xQM structure.
 */
STATIC void
xfs_qm_dquot_logitem_pin(
	xfs_dq_logitem_t *logitem)
{
	unsigned long	s;
	xfs_dquot_t *dqp;

	dqp = logitem->qli_dquot;
	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	s = XFS_DQ_PINLOCK(dqp);
	dqp->q_pincount++;
	XFS_DQ_PINUNLOCK(dqp, s);
}

/*
 * Decrement the pin count of the given dquot, and wake up
 * anyone in xfs_dqwait_unpin() if the count goes to 0.	 The
 * dquot must have been previously pinned with a call to xfs_dqpin().
 */
/* ARGSUSED */
STATIC void
xfs_qm_dquot_logitem_unpin(
	xfs_dq_logitem_t *logitem,
	int		  stale)
{
	unsigned long	s;
	xfs_dquot_t *dqp;

	dqp = logitem->qli_dquot;
	ASSERT(dqp->q_pincount > 0);
	s = XFS_DQ_PINLOCK(dqp);
	dqp->q_pincount--;
	if (dqp->q_pincount == 0) {
		sv_broadcast(&dqp->q_pinwait);
	}
	XFS_DQ_PINUNLOCK(dqp, s);
}

/* ARGSUSED */
STATIC void
xfs_qm_dquot_logitem_unpin_remove(
	xfs_dq_logitem_t *logitem,
	xfs_trans_t	 *tp)
{
	xfs_qm_dquot_logitem_unpin(logitem, 0);
}

/*
 * Given the logitem, this writes the corresponding dquot entry to disk
 * asynchronously. This is called with the dquot entry securely locked;
 * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
 * at the end.
 */
STATIC void
xfs_qm_dquot_logitem_push(
	xfs_dq_logitem_t	*logitem)
{
	xfs_dquot_t	*dqp;

	dqp = logitem->qli_dquot;

	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp));

	/*
	 * Since we were able to lock the dquot's flush lock and
	 * we found it on the AIL, the dquot must be dirty.  This
	 * is because the dquot is removed from the AIL while still
	 * holding the flush lock in xfs_dqflush_done().  Thus, if
	 * we found it in the AIL and were able to obtain the flush
	 * lock without sleeping, then there must not have been
	 * anyone in the process of flushing the dquot.
	 */
	xfs_qm_dqflush(dqp, XFS_B_DELWRI);
	xfs_dqunlock(dqp);
}

/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_dquot_logitem_committed(
	xfs_dq_logitem_t	*l,
	xfs_lsn_t		lsn)
{
	/*
	 * We always re-log the entire dquot when it becomes dirty,
	 * so, the latest copy _is_ the only one that matters.
	 */
	return (lsn);
}


/*
 * This is called to wait for the given dquot to be unpinned.
 * Most of these pin/unpin routines are plagiarized from inode code.
 */
void
xfs_qm_dqunpin_wait(
	xfs_dquot_t	*dqp)
{
	SPLDECL(s);

	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	if (dqp->q_pincount == 0) {
		return;
	}

	/*
	 * Give the log a push so we don't wait here too long.
	 */
	xfs_log_force(dqp->q_mount, (xfs_lsn_t)0, XFS_LOG_FORCE);
	s = XFS_DQ_PINLOCK(dqp);
	if (dqp->q_pincount == 0) {
		XFS_DQ_PINUNLOCK(dqp, s);
		return;
	}
	sv_wait(&(dqp->q_pinwait), PINOD,
		&(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s);
}

/*
 * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
 * the dquot is locked by us, but the flush lock isn't. So, here we are
 * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
 * If so, we want to push it out to help us take this item off the AIL as soon
 * as possible.
 *
 * We must not be holding the AIL_LOCK at this point. Calling incore() to
 * search the buffer cache can be a time consuming thing, and AIL_LOCK is a
 * spinlock.
 */
STATIC void
xfs_qm_dquot_logitem_pushbuf(
	xfs_dq_logitem_t    *qip)
{
	xfs_dquot_t	*dqp;
	xfs_mount_t	*mp;
	xfs_buf_t	*bp;
	uint		dopush;

	dqp = qip->qli_dquot;
	ASSERT(XFS_DQ_IS_LOCKED(dqp));

	/*
	 * The qli_pushbuf_flag keeps others from
	 * trying to duplicate our effort.
	 */
	ASSERT(qip->qli_pushbuf_flag != 0);
	ASSERT(qip->qli_push_owner == current_pid());

	/*
	 * If flushlock isn't locked anymore, chances are that the
	 * inode flush completed and the inode was taken off the AIL.
	 * So, just get out.
	 */
	if ((valusema(&(dqp->q_flock)) > 0)  ||
	    ((qip->qli_item.li_flags & XFS_LI_IN_AIL) == 0)) {
		qip->qli_pushbuf_flag = 0;
		xfs_dqunlock(dqp);
		return;
	}
	mp = dqp->q_mount;
	bp = xfs_incore(mp->m_ddev_targp, qip->qli_format.qlf_blkno,
		    XFS_QI_DQCHUNKLEN(mp),
		    XFS_INCORE_TRYLOCK);
	if (bp != NULL) {
		if (XFS_BUF_ISDELAYWRITE(bp)) {
			dopush = ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
				  (valusema(&(dqp->q_flock)) <= 0));
			qip->qli_pushbuf_flag = 0;
			xfs_dqunlock(dqp);

			if (XFS_BUF_ISPINNED(bp)) {
				xfs_log_force(mp, (xfs_lsn_t)0,
					      XFS_LOG_FORCE);
			}
			if (dopush) {
#ifdef XFSRACEDEBUG
				delay_for_intr();
				delay(300);
#endif
				xfs_bawrite(mp, bp);
			} else {
				xfs_buf_relse(bp);
			}
		} else {
			qip->qli_pushbuf_flag = 0;
			xfs_dqunlock(dqp);
			xfs_buf_relse(bp);
		}
		return;
	}

	qip->qli_pushbuf_flag = 0;
	xfs_dqunlock(dqp);
}

/*
 * This is called to attempt to lock the dquot associated with this
 * dquot log item.  Don't sleep on the dquot lock or the flush lock.
 * If the flush lock is already held, indicating that the dquot has
 * been or is in the process of being flushed, then see if we can
 * find the dquot's buffer in the buffer cache without sleeping.  If
 * we can and it is marked delayed write, then we want to send it out.
 * We delay doing so until the push routine, though, to avoid sleeping
 * in any device strategy routines.
 */
STATIC uint
xfs_qm_dquot_logitem_trylock(
	xfs_dq_logitem_t	*qip)
{
	xfs_dquot_t		*dqp;
	uint			retval;

	dqp = qip->qli_dquot;
	if (dqp->q_pincount > 0)
		return (XFS_ITEM_PINNED);

	if (! xfs_qm_dqlock_nowait(dqp))
		return (XFS_ITEM_LOCKED);

	retval = XFS_ITEM_SUCCESS;
	if (! xfs_qm_dqflock_nowait(dqp)) {
		/*
		 * The dquot is already being flushed.	It may have been
		 * flushed delayed write, however, and we don't want to
		 * get stuck waiting for that to complete.  So, we want to check
		 * to see if we can lock the dquot's buffer without sleeping.
		 * If we can and it is marked for delayed write, then we
		 * hold it and send it out from the push routine.  We don't
		 * want to do that now since we might sleep in the device
		 * strategy routine.  We also don't want to grab the buffer lock
		 * here because we'd like not to call into the buffer cache
		 * while holding the AIL_LOCK.
		 * Make sure to only return PUSHBUF if we set pushbuf_flag
		 * ourselves.  If someone else is doing it then we don't
		 * want to go to the push routine and duplicate their efforts.
		 */
		if (qip->qli_pushbuf_flag == 0) {
			qip->qli_pushbuf_flag = 1;
			ASSERT(qip->qli_format.qlf_blkno == dqp->q_blkno);
#ifdef DEBUG
			qip->qli_push_owner = current_pid();
#endif
			/*
			 * The dquot is left locked.
			 */
			retval = XFS_ITEM_PUSHBUF;
		} else {
			retval = XFS_ITEM_FLUSHING;
			xfs_dqunlock_nonotify(dqp);
		}
	}

	ASSERT(qip->qli_item.li_flags & XFS_LI_IN_AIL);
	return (retval);
}


/*
 * Unlock the dquot associated with the log item.
 * Clear the fields of the dquot and dquot log item that
 * are specific to the current transaction.  If the
 * hold flags is set, do not unlock the dquot.
 */
STATIC void
xfs_qm_dquot_logitem_unlock(
	xfs_dq_logitem_t    *ql)
{
	xfs_dquot_t	*dqp;

	ASSERT(ql != NULL);
	dqp = ql->qli_dquot;
	ASSERT(XFS_DQ_IS_LOCKED(dqp));

	/*
	 * Clear the transaction pointer in the dquot
	 */
	dqp->q_transp = NULL;

	/*
	 * dquots are never 'held' from getting unlocked at the end of
	 * a transaction.  Their locking and unlocking is hidden inside the
	 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
	 * for the logitem.
	 */
	xfs_dqunlock(dqp);
}


/*
 * The transaction with the dquot locked has aborted.  The dquot
 * must not be dirty within the transaction.  We simply unlock just
 * as if the transaction had been cancelled.
 */
STATIC void
xfs_qm_dquot_logitem_abort(
	xfs_dq_logitem_t    *ql)
{
	xfs_qm_dquot_logitem_unlock(ql);
}

/*
 * this needs to stamp an lsn into the dquot, I think.
 * rpc's that look at user dquot's would then have to
 * push on the dependency recorded in the dquot
 */
/* ARGSUSED */
STATIC void
xfs_qm_dquot_logitem_committing(
	xfs_dq_logitem_t	*l,
	xfs_lsn_t		lsn)
{
	return;
}


/*
 * This is the ops vector for dquots
 */
STATIC struct xfs_item_ops xfs_dquot_item_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_qm_dquot_logitem_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t*, int))
					xfs_qm_dquot_logitem_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
					xfs_qm_dquot_logitem_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))
					xfs_qm_dquot_logitem_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_dquot_logitem_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_abort,
	.iop_pushbuf	= (void(*)(xfs_log_item_t*))
					xfs_qm_dquot_logitem_pushbuf,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_dquot_logitem_committing
};

/*
 * Initialize the dquot log item for a newly allocated dquot.
 * The dquot isn't locked at this point, but it isn't on any of the lists
 * either, so we don't care.
 */
void
xfs_qm_dquot_logitem_init(
	struct xfs_dquot *dqp)
{
	xfs_dq_logitem_t  *lp;
	lp = &dqp->q_logitem;

	lp->qli_item.li_type = XFS_LI_DQUOT;
	lp->qli_item.li_ops = &xfs_dquot_item_ops;
	lp->qli_item.li_mountp = dqp->q_mount;
	lp->qli_dquot = dqp;
	lp->qli_format.qlf_type = XFS_LI_DQUOT;
	lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
	lp->qli_format.qlf_blkno = dqp->q_blkno;
	lp->qli_format.qlf_len = 1;
	/*
	 * This is just the offset of this dquot within its buffer
	 * (which is currently 1 FSB and probably won't change).
	 * Hence 32 bits for this offset should be just fine.
	 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
	 * here, and recompute it at recovery time.
	 */
	lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
}

/*------------------  QUOTAOFF LOG ITEMS  -------------------*/

/*
 * This returns the number of iovecs needed to log the given quotaoff item.
 * We only need 1 iovec for an quotaoff item.  It just logs the
 * quotaoff_log_format structure.
 */
/*ARGSUSED*/
STATIC uint
xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t *qf)
{
	return (1);
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given quotaoff log item. We use only 1 iovec, and we point that
 * at the quotaoff_log_format structure embedded in the quotaoff item.
 * It is at this point that we assert that all of the extent
 * slots in the quotaoff item have been filled.
 */
STATIC void
xfs_qm_qoff_logitem_format(xfs_qoff_logitem_t	*qf,
			   xfs_log_iovec_t	*log_vector)
{
	ASSERT(qf->qql_format.qf_type == XFS_LI_QUOTAOFF);

	log_vector->i_addr = (xfs_caddr_t)&(qf->qql_format);
	log_vector->i_len = sizeof(xfs_qoff_logitem_t);
	XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_QUOTAOFF);
	qf->qql_format.qf_size = 1;
}


/*
 * Pinning has no meaning for an quotaoff item, so just return.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
{
	return;
}


/*
 * Since pinning has no meaning for an quotaoff item, unpinning does
 * not either.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf, int stale)
{
	return;
}

/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t *qf, xfs_trans_t *tp)
{
	return;
}

/*
 * Quotaoff items have no locking, so just return success.
 */
/*ARGSUSED*/
STATIC uint
xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t *qf)
{
	return XFS_ITEM_LOCKED;
}

/*
 * Quotaoff items have no locking or pushing, so return failure
 * so that the caller doesn't bother with us.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t *qf)
{
	return;
}

/*
 * The quotaoff-start-item is logged only once and cannot be moved in the log,
 * so simply return the lsn at which it's been logged.
 */
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t *qf, xfs_lsn_t lsn)
{
	return (lsn);
}

/*
 * The transaction of which this QUOTAOFF is a part has been aborted.
 * Just clean up after ourselves.
 * Shouldn't this never happen in the case of qoffend logitems? XXX
 */
STATIC void
xfs_qm_qoff_logitem_abort(xfs_qoff_logitem_t *qf)
{
	kmem_free(qf, sizeof(xfs_qoff_logitem_t));
}

/*
 * There isn't much you can do to push on an quotaoff item.  It is simply
 * stuck waiting for the log to be flushed to disk.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t *qf)
{
	return;
}


/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_qoffend_logitem_committed(
	xfs_qoff_logitem_t *qfe,
	xfs_lsn_t lsn)
{
	xfs_qoff_logitem_t	*qfs;
	SPLDECL(s);

	qfs = qfe->qql_start_lip;
	AIL_LOCK(qfs->qql_item.li_mountp,s);
	/*
	 * Delete the qoff-start logitem from the AIL.
	 * xfs_trans_delete_ail() drops the AIL lock.
	 */
	xfs_trans_delete_ail(qfs->qql_item.li_mountp, (xfs_log_item_t *)qfs, s);
	kmem_free(qfs, sizeof(xfs_qoff_logitem_t));
	kmem_free(qfe, sizeof(xfs_qoff_logitem_t));
	return (xfs_lsn_t)-1;
}

/*
 * XXX rcc - don't know quite what to do with this.  I think we can
 * just ignore it.  The only time that isn't the case is if we allow
 * the client to somehow see that quotas have been turned off in which
 * we can't allow that to get back until the quotaoff hits the disk.
 * So how would that happen?  Also, do we need different routines for
 * quotaoff start and quotaoff end?  I suspect the answer is yes but
 * to be sure, I need to look at the recovery code and see how quota off
 * recovery is handled (do we roll forward or back or do something else).
 * If we roll forwards or backwards, then we need two separate routines,
 * one that does nothing and one that stamps in the lsn that matters
 * (truly makes the quotaoff irrevocable).  If we do something else,
 * then maybe we don't need two.
 */
/* ARGSUSED */
STATIC void
xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
{
	return;
}

/* ARGSUSED */
STATIC void
xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
{
	return;
}

STATIC struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_qm_qoff_logitem_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t* ,int))
					xfs_qm_qoff_logitem_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
					xfs_qm_qoff_logitem_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoffend_logitem_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
	.iop_pushbuf	= NULL,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoffend_logitem_committing
};

/*
 * This is the ops vector shared by all quotaoff-start log items.
 */
STATIC struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_qm_qoff_logitem_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t*, int))
					xfs_qm_qoff_logitem_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
					xfs_qm_qoff_logitem_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoff_logitem_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
	.iop_pushbuf	= NULL,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoff_logitem_committing
};

/*
 * Allocate and initialize an quotaoff item of the correct quota type(s).
 */
xfs_qoff_logitem_t *
xfs_qm_qoff_logitem_init(
	struct xfs_mount *mp,
	xfs_qoff_logitem_t *start,
	uint flags)
{
	xfs_qoff_logitem_t	*qf;

	qf = (xfs_qoff_logitem_t*) kmem_zalloc(sizeof(xfs_qoff_logitem_t), KM_SLEEP);

	qf->qql_item.li_type = XFS_LI_QUOTAOFF;
	if (start)
		qf->qql_item.li_ops = &xfs_qm_qoffend_logitem_ops;
	else
		qf->qql_item.li_ops = &xfs_qm_qoff_logitem_ops;
	qf->qql_item.li_mountp = mp;
	qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
	qf->qql_format.qf_flags = flags;
	qf->qql_start_lip = start;
	return (qf);
}