Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: ce78534a047eebe9a1b86cec00f7f4b3f396489b (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
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
/*
 * Copyright (c) 2000-2002 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_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_error.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_quota.h"
#include "xfs_qm.h"

STATIC void	xfs_trans_alloc_dqinfo(xfs_trans_t *);

/*
 * Add the locked dquot to the transaction.
 * The dquot must be locked, and it cannot be associated with any
 * transaction.
 */
void
xfs_trans_dqjoin(
	xfs_trans_t	*tp,
	xfs_dquot_t	*dqp)
{
	ASSERT(dqp->q_transp != tp);
	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	ASSERT(dqp->q_logitem.qli_dquot == dqp);

	/*
	 * Get a log_item_desc to point at the new item.
	 */
	xfs_trans_add_item(tp, &dqp->q_logitem.qli_item);

	/*
	 * Initialize d_transp so we can later determine if this dquot is
	 * associated with this transaction.
	 */
	dqp->q_transp = tp;
}


/*
 * This is called to mark the dquot as needing
 * to be logged when the transaction is committed.  The dquot must
 * already be associated with the given transaction.
 * Note that it marks the entire transaction as dirty. In the ordinary
 * case, this gets called via xfs_trans_commit, after the transaction
 * is already dirty. However, there's nothing stop this from getting
 * called directly, as done by xfs_qm_scall_setqlim. Hence, the TRANS_DIRTY
 * flag.
 */
void
xfs_trans_log_dquot(
	xfs_trans_t	*tp,
	xfs_dquot_t	*dqp)
{
	ASSERT(dqp->q_transp == tp);
	ASSERT(XFS_DQ_IS_LOCKED(dqp));

	tp->t_flags |= XFS_TRANS_DIRTY;
	dqp->q_logitem.qli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
}

/*
 * Carry forward whatever is left of the quota blk reservation to
 * the spanky new transaction
 */
void
xfs_trans_dup_dqinfo(
	xfs_trans_t	*otp,
	xfs_trans_t	*ntp)
{
	xfs_dqtrx_t	*oq, *nq;
	int		i, j;
	xfs_dqtrx_t	*oqa, *nqa;
	ulong		blk_res_used;

	if (!otp->t_dqinfo)
		return;

	xfs_trans_alloc_dqinfo(ntp);

	/*
	 * Because the quota blk reservation is carried forward,
	 * it is also necessary to carry forward the DQ_DIRTY flag.
	 */
	if (otp->t_flags & XFS_TRANS_DQ_DIRTY)
		ntp->t_flags |= XFS_TRANS_DQ_DIRTY;

	for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
		oqa = otp->t_dqinfo->dqs[j];
		nqa = ntp->t_dqinfo->dqs[j];
		for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
			blk_res_used = 0;

			if (oqa[i].qt_dquot == NULL)
				break;
			oq = &oqa[i];
			nq = &nqa[i];

			if (oq->qt_blk_res && oq->qt_bcount_delta > 0)
				blk_res_used = oq->qt_bcount_delta;

			nq->qt_dquot = oq->qt_dquot;
			nq->qt_bcount_delta = nq->qt_icount_delta = 0;
			nq->qt_rtbcount_delta = 0;

			/*
			 * Transfer whatever is left of the reservations.
			 */
			nq->qt_blk_res = oq->qt_blk_res - blk_res_used;
			oq->qt_blk_res = blk_res_used;

			nq->qt_rtblk_res = oq->qt_rtblk_res -
				oq->qt_rtblk_res_used;
			oq->qt_rtblk_res = oq->qt_rtblk_res_used;

			nq->qt_ino_res = oq->qt_ino_res - oq->qt_ino_res_used;
			oq->qt_ino_res = oq->qt_ino_res_used;

		}
	}
}

/*
 * Wrap around mod_dquot to account for both user and group quotas.
 */
void
xfs_trans_mod_dquot_byino(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	uint		field,
	long		delta)
{
	xfs_mount_t	*mp = tp->t_mountp;

	if (!XFS_IS_QUOTA_RUNNING(mp) ||
	    !XFS_IS_QUOTA_ON(mp) ||
	    xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
		return;

	if (tp->t_dqinfo == NULL)
		xfs_trans_alloc_dqinfo(tp);

	if (XFS_IS_UQUOTA_ON(mp) && ip->i_udquot)
		(void) xfs_trans_mod_dquot(tp, ip->i_udquot, field, delta);
	if (XFS_IS_GQUOTA_ON(mp) && ip->i_gdquot)
		(void) xfs_trans_mod_dquot(tp, ip->i_gdquot, field, delta);
	if (XFS_IS_PQUOTA_ON(mp) && ip->i_pdquot)
		(void) xfs_trans_mod_dquot(tp, ip->i_pdquot, field, delta);
}

STATIC struct xfs_dqtrx *
xfs_trans_get_dqtrx(
	struct xfs_trans	*tp,
	struct xfs_dquot	*dqp)
{
	int			i;
	struct xfs_dqtrx	*qa;

	if (XFS_QM_ISUDQ(dqp))
		qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_USR];
	else if (XFS_QM_ISGDQ(dqp))
		qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_GRP];
	else if (XFS_QM_ISPDQ(dqp))
		qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_PRJ];
	else
		return NULL;

	for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
		if (qa[i].qt_dquot == NULL ||
		    qa[i].qt_dquot == dqp)
			return &qa[i];
	}

	return NULL;
}

/*
 * Make the changes in the transaction structure.
 * The moral equivalent to xfs_trans_mod_sb().
 * We don't touch any fields in the dquot, so we don't care
 * if it's locked or not (most of the time it won't be).
 */
void
xfs_trans_mod_dquot(
	xfs_trans_t	*tp,
	xfs_dquot_t	*dqp,
	uint		field,
	long		delta)
{
	xfs_dqtrx_t	*qtrx;

	ASSERT(tp);
	ASSERT(XFS_IS_QUOTA_RUNNING(tp->t_mountp));
	qtrx = NULL;

	if (tp->t_dqinfo == NULL)
		xfs_trans_alloc_dqinfo(tp);
	/*
	 * Find either the first free slot or the slot that belongs
	 * to this dquot.
	 */
	qtrx = xfs_trans_get_dqtrx(tp, dqp);
	ASSERT(qtrx);
	if (qtrx->qt_dquot == NULL)
		qtrx->qt_dquot = dqp;

	switch (field) {

		/*
		 * regular disk blk reservation
		 */
	      case XFS_TRANS_DQ_RES_BLKS:
		qtrx->qt_blk_res += (ulong)delta;
		break;

		/*
		 * inode reservation
		 */
	      case XFS_TRANS_DQ_RES_INOS:
		qtrx->qt_ino_res += (ulong)delta;
		break;

		/*
		 * disk blocks used.
		 */
	      case XFS_TRANS_DQ_BCOUNT:
		qtrx->qt_bcount_delta += delta;
		break;

	      case XFS_TRANS_DQ_DELBCOUNT:
		qtrx->qt_delbcnt_delta += delta;
		break;

		/*
		 * Inode Count
		 */
	      case XFS_TRANS_DQ_ICOUNT:
		if (qtrx->qt_ino_res && delta > 0) {
			qtrx->qt_ino_res_used += (ulong)delta;
			ASSERT(qtrx->qt_ino_res >= qtrx->qt_ino_res_used);
		}
		qtrx->qt_icount_delta += delta;
		break;

		/*
		 * rtblk reservation
		 */
	      case XFS_TRANS_DQ_RES_RTBLKS:
		qtrx->qt_rtblk_res += (ulong)delta;
		break;

		/*
		 * rtblk count
		 */
	      case XFS_TRANS_DQ_RTBCOUNT:
		if (qtrx->qt_rtblk_res && delta > 0) {
			qtrx->qt_rtblk_res_used += (ulong)delta;
			ASSERT(qtrx->qt_rtblk_res >= qtrx->qt_rtblk_res_used);
		}
		qtrx->qt_rtbcount_delta += delta;
		break;

	      case XFS_TRANS_DQ_DELRTBCOUNT:
		qtrx->qt_delrtb_delta += delta;
		break;

	      default:
		ASSERT(0);
	}
	tp->t_flags |= XFS_TRANS_DQ_DIRTY;
}


/*
 * Given an array of dqtrx structures, lock all the dquots associated and join
 * them to the transaction, provided they have been modified.  We know that the
 * highest number of dquots of one type - usr, grp and prj - involved in a
 * transaction is 3 so we don't need to make this very generic.
 */
STATIC void
xfs_trans_dqlockedjoin(
	xfs_trans_t	*tp,
	xfs_dqtrx_t	*q)
{
	ASSERT(q[0].qt_dquot != NULL);
	if (q[1].qt_dquot == NULL) {
		xfs_dqlock(q[0].qt_dquot);
		xfs_trans_dqjoin(tp, q[0].qt_dquot);
	} else {
		ASSERT(XFS_QM_TRANS_MAXDQS == 2);
		xfs_dqlock2(q[0].qt_dquot, q[1].qt_dquot);
		xfs_trans_dqjoin(tp, q[0].qt_dquot);
		xfs_trans_dqjoin(tp, q[1].qt_dquot);
	}
}


/*
 * Called by xfs_trans_commit() and similar in spirit to
 * xfs_trans_apply_sb_deltas().
 * Go thru all the dquots belonging to this transaction and modify the
 * INCORE dquot to reflect the actual usages.
 * Unreserve just the reservations done by this transaction.
 * dquot is still left locked at exit.
 */
void
xfs_trans_apply_dquot_deltas(
	struct xfs_trans	*tp)
{
	int			i, j;
	struct xfs_dquot	*dqp;
	struct xfs_dqtrx	*qtrx, *qa;
	struct xfs_disk_dquot	*d;
	long			totalbdelta;
	long			totalrtbdelta;

	if (!(tp->t_flags & XFS_TRANS_DQ_DIRTY))
		return;

	ASSERT(tp->t_dqinfo);
	for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
		qa = tp->t_dqinfo->dqs[j];
		if (qa[0].qt_dquot == NULL)
			continue;

		/*
		 * Lock all of the dquots and join them to the transaction.
		 */
		xfs_trans_dqlockedjoin(tp, qa);

		for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
			qtrx = &qa[i];
			/*
			 * The array of dquots is filled
			 * sequentially, not sparsely.
			 */
			if ((dqp = qtrx->qt_dquot) == NULL)
				break;

			ASSERT(XFS_DQ_IS_LOCKED(dqp));
			ASSERT(dqp->q_transp == tp);

			/*
			 * adjust the actual number of blocks used
			 */
			d = &dqp->q_core;

			/*
			 * The issue here is - sometimes we don't make a blkquota
			 * reservation intentionally to be fair to users
			 * (when the amount is small). On the other hand,
			 * delayed allocs do make reservations, but that's
			 * outside of a transaction, so we have no
			 * idea how much was really reserved.
			 * So, here we've accumulated delayed allocation blks and
			 * non-delay blks. The assumption is that the
			 * delayed ones are always reserved (outside of a
			 * transaction), and the others may or may not have
			 * quota reservations.
			 */
			totalbdelta = qtrx->qt_bcount_delta +
				qtrx->qt_delbcnt_delta;
			totalrtbdelta = qtrx->qt_rtbcount_delta +
				qtrx->qt_delrtb_delta;
#ifdef DEBUG
			if (totalbdelta < 0)
				ASSERT(be64_to_cpu(d->d_bcount) >=
				       -totalbdelta);

			if (totalrtbdelta < 0)
				ASSERT(be64_to_cpu(d->d_rtbcount) >=
				       -totalrtbdelta);

			if (qtrx->qt_icount_delta < 0)
				ASSERT(be64_to_cpu(d->d_icount) >=
				       -qtrx->qt_icount_delta);
#endif
			if (totalbdelta)
				be64_add_cpu(&d->d_bcount, (xfs_qcnt_t)totalbdelta);

			if (qtrx->qt_icount_delta)
				be64_add_cpu(&d->d_icount, (xfs_qcnt_t)qtrx->qt_icount_delta);

			if (totalrtbdelta)
				be64_add_cpu(&d->d_rtbcount, (xfs_qcnt_t)totalrtbdelta);

			/*
			 * Get any default limits in use.
			 * Start/reset the timer(s) if needed.
			 */
			if (d->d_id) {
				xfs_qm_adjust_dqlimits(tp->t_mountp, dqp);
				xfs_qm_adjust_dqtimers(tp->t_mountp, d);
			}

			dqp->dq_flags |= XFS_DQ_DIRTY;
			/*
			 * add this to the list of items to get logged
			 */
			xfs_trans_log_dquot(tp, dqp);
			/*
			 * Take off what's left of the original reservation.
			 * In case of delayed allocations, there's no
			 * reservation that a transaction structure knows of.
			 */
			if (qtrx->qt_blk_res != 0) {
				ulong blk_res_used = 0;

				if (qtrx->qt_bcount_delta > 0)
					blk_res_used = qtrx->qt_bcount_delta;

				if (qtrx->qt_blk_res != blk_res_used) {
					if (qtrx->qt_blk_res > blk_res_used)
						dqp->q_res_bcount -= (xfs_qcnt_t)
							(qtrx->qt_blk_res -
							 blk_res_used);
					else
						dqp->q_res_bcount -= (xfs_qcnt_t)
							(blk_res_used -
							 qtrx->qt_blk_res);
				}
			} else {
				/*
				 * These blks were never reserved, either inside
				 * a transaction or outside one (in a delayed
				 * allocation). Also, this isn't always a
				 * negative number since we sometimes
				 * deliberately skip quota reservations.
				 */
				if (qtrx->qt_bcount_delta) {
					dqp->q_res_bcount +=
					      (xfs_qcnt_t)qtrx->qt_bcount_delta;
				}
			}
			/*
			 * Adjust the RT reservation.
			 */
			if (qtrx->qt_rtblk_res != 0) {
				if (qtrx->qt_rtblk_res != qtrx->qt_rtblk_res_used) {
					if (qtrx->qt_rtblk_res >
					    qtrx->qt_rtblk_res_used)
					       dqp->q_res_rtbcount -= (xfs_qcnt_t)
						       (qtrx->qt_rtblk_res -
							qtrx->qt_rtblk_res_used);
					else
					       dqp->q_res_rtbcount -= (xfs_qcnt_t)
						       (qtrx->qt_rtblk_res_used -
							qtrx->qt_rtblk_res);
				}
			} else {
				if (qtrx->qt_rtbcount_delta)
					dqp->q_res_rtbcount +=
					    (xfs_qcnt_t)qtrx->qt_rtbcount_delta;
			}

			/*
			 * Adjust the inode reservation.
			 */
			if (qtrx->qt_ino_res != 0) {
				ASSERT(qtrx->qt_ino_res >=
				       qtrx->qt_ino_res_used);
				if (qtrx->qt_ino_res > qtrx->qt_ino_res_used)
					dqp->q_res_icount -= (xfs_qcnt_t)
						(qtrx->qt_ino_res -
						 qtrx->qt_ino_res_used);
			} else {
				if (qtrx->qt_icount_delta)
					dqp->q_res_icount +=
					    (xfs_qcnt_t)qtrx->qt_icount_delta;
			}

			ASSERT(dqp->q_res_bcount >=
				be64_to_cpu(dqp->q_core.d_bcount));
			ASSERT(dqp->q_res_icount >=
				be64_to_cpu(dqp->q_core.d_icount));
			ASSERT(dqp->q_res_rtbcount >=
				be64_to_cpu(dqp->q_core.d_rtbcount));
		}
	}
}

/*
 * Release the reservations, and adjust the dquots accordingly.
 * This is called only when the transaction is being aborted. If by
 * any chance we have done dquot modifications incore (ie. deltas) already,
 * we simply throw those away, since that's the expected behavior
 * when a transaction is curtailed without a commit.
 */
void
xfs_trans_unreserve_and_mod_dquots(
	xfs_trans_t		*tp)
{
	int			i, j;
	xfs_dquot_t		*dqp;
	xfs_dqtrx_t		*qtrx, *qa;
	bool                    locked;

	if (!tp->t_dqinfo || !(tp->t_flags & XFS_TRANS_DQ_DIRTY))
		return;

	for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
		qa = tp->t_dqinfo->dqs[j];

		for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
			qtrx = &qa[i];
			/*
			 * We assume that the array of dquots is filled
			 * sequentially, not sparsely.
			 */
			if ((dqp = qtrx->qt_dquot) == NULL)
				break;
			/*
			 * Unreserve the original reservation. We don't care
			 * about the number of blocks used field, or deltas.
			 * Also we don't bother to zero the fields.
			 */
			locked = false;
			if (qtrx->qt_blk_res) {
				xfs_dqlock(dqp);
				locked = true;
				dqp->q_res_bcount -=
					(xfs_qcnt_t)qtrx->qt_blk_res;
			}
			if (qtrx->qt_ino_res) {
				if (!locked) {
					xfs_dqlock(dqp);
					locked = true;
				}
				dqp->q_res_icount -=
					(xfs_qcnt_t)qtrx->qt_ino_res;
			}

			if (qtrx->qt_rtblk_res) {
				if (!locked) {
					xfs_dqlock(dqp);
					locked = true;
				}
				dqp->q_res_rtbcount -=
					(xfs_qcnt_t)qtrx->qt_rtblk_res;
			}
			if (locked)
				xfs_dqunlock(dqp);

		}
	}
}

STATIC void
xfs_quota_warn(
	struct xfs_mount	*mp,
	struct xfs_dquot	*dqp,
	int			type)
{
	/* no warnings for project quotas - we just return ENOSPC later */
	if (dqp->dq_flags & XFS_DQ_PROJ)
		return;
	quota_send_warning(make_kqid(&init_user_ns,
				     (dqp->dq_flags & XFS_DQ_USER) ?
				     USRQUOTA : GRPQUOTA,
				     be32_to_cpu(dqp->q_core.d_id)),
			   mp->m_super->s_dev, type);
}

/*
 * This reserves disk blocks and inodes against a dquot.
 * Flags indicate if the dquot is to be locked here and also
 * if the blk reservation is for RT or regular blocks.
 * Sending in XFS_QMOPT_FORCE_RES flag skips the quota check.
 */
STATIC int
xfs_trans_dqresv(
	xfs_trans_t	*tp,
	xfs_mount_t	*mp,
	xfs_dquot_t	*dqp,
	long		nblks,
	long		ninos,
	uint		flags)
{
	xfs_qcnt_t	hardlimit;
	xfs_qcnt_t	softlimit;
	time_t		timer;
	xfs_qwarncnt_t	warns;
	xfs_qwarncnt_t	warnlimit;
	xfs_qcnt_t	total_count;
	xfs_qcnt_t	*resbcountp;
	xfs_quotainfo_t	*q = mp->m_quotainfo;


	xfs_dqlock(dqp);

	if (flags & XFS_TRANS_DQ_RES_BLKS) {
		hardlimit = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
		if (!hardlimit)
			hardlimit = q->qi_bhardlimit;
		softlimit = be64_to_cpu(dqp->q_core.d_blk_softlimit);
		if (!softlimit)
			softlimit = q->qi_bsoftlimit;
		timer = be32_to_cpu(dqp->q_core.d_btimer);
		warns = be16_to_cpu(dqp->q_core.d_bwarns);
		warnlimit = dqp->q_mount->m_quotainfo->qi_bwarnlimit;
		resbcountp = &dqp->q_res_bcount;
	} else {
		ASSERT(flags & XFS_TRANS_DQ_RES_RTBLKS);
		hardlimit = be64_to_cpu(dqp->q_core.d_rtb_hardlimit);
		if (!hardlimit)
			hardlimit = q->qi_rtbhardlimit;
		softlimit = be64_to_cpu(dqp->q_core.d_rtb_softlimit);
		if (!softlimit)
			softlimit = q->qi_rtbsoftlimit;
		timer = be32_to_cpu(dqp->q_core.d_rtbtimer);
		warns = be16_to_cpu(dqp->q_core.d_rtbwarns);
		warnlimit = dqp->q_mount->m_quotainfo->qi_rtbwarnlimit;
		resbcountp = &dqp->q_res_rtbcount;
	}

	if ((flags & XFS_QMOPT_FORCE_RES) == 0 &&
	    dqp->q_core.d_id &&
	    ((XFS_IS_UQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISUDQ(dqp)) ||
	     (XFS_IS_GQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISGDQ(dqp)) ||
	     (XFS_IS_PQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISPDQ(dqp)))) {
		if (nblks > 0) {
			/*
			 * dquot is locked already. See if we'd go over the
			 * hardlimit or exceed the timelimit if we allocate
			 * nblks.
			 */
			total_count = *resbcountp + nblks;
			if (hardlimit && total_count > hardlimit) {
				xfs_quota_warn(mp, dqp, QUOTA_NL_BHARDWARN);
				goto error_return;
			}
			if (softlimit && total_count > softlimit) {
				if ((timer != 0 && get_seconds() > timer) ||
				    (warns != 0 && warns >= warnlimit)) {
					xfs_quota_warn(mp, dqp,
						       QUOTA_NL_BSOFTLONGWARN);
					goto error_return;
				}

				xfs_quota_warn(mp, dqp, QUOTA_NL_BSOFTWARN);
			}
		}
		if (ninos > 0) {
			total_count = be64_to_cpu(dqp->q_core.d_icount) + ninos;
			timer = be32_to_cpu(dqp->q_core.d_itimer);
			warns = be16_to_cpu(dqp->q_core.d_iwarns);
			warnlimit = dqp->q_mount->m_quotainfo->qi_iwarnlimit;
			hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
			if (!hardlimit)
				hardlimit = q->qi_ihardlimit;
			softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
			if (!softlimit)
				softlimit = q->qi_isoftlimit;

			if (hardlimit && total_count > hardlimit) {
				xfs_quota_warn(mp, dqp, QUOTA_NL_IHARDWARN);
				goto error_return;
			}
			if (softlimit && total_count > softlimit) {
				if  ((timer != 0 && get_seconds() > timer) ||
				     (warns != 0 && warns >= warnlimit)) {
					xfs_quota_warn(mp, dqp,
						       QUOTA_NL_ISOFTLONGWARN);
					goto error_return;
				}
				xfs_quota_warn(mp, dqp, QUOTA_NL_ISOFTWARN);
			}
		}
	}

	/*
	 * Change the reservation, but not the actual usage.
	 * Note that q_res_bcount = q_core.d_bcount + resv
	 */
	(*resbcountp) += (xfs_qcnt_t)nblks;
	if (ninos != 0)
		dqp->q_res_icount += (xfs_qcnt_t)ninos;

	/*
	 * note the reservation amt in the trans struct too,
	 * so that the transaction knows how much was reserved by
	 * it against this particular dquot.
	 * We don't do this when we are reserving for a delayed allocation,
	 * because we don't have the luxury of a transaction envelope then.
	 */
	if (tp) {
		ASSERT(tp->t_dqinfo);
		ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
		if (nblks != 0)
			xfs_trans_mod_dquot(tp, dqp,
					    flags & XFS_QMOPT_RESBLK_MASK,
					    nblks);
		if (ninos != 0)
			xfs_trans_mod_dquot(tp, dqp,
					    XFS_TRANS_DQ_RES_INOS,
					    ninos);
	}
	ASSERT(dqp->q_res_bcount >= be64_to_cpu(dqp->q_core.d_bcount));
	ASSERT(dqp->q_res_rtbcount >= be64_to_cpu(dqp->q_core.d_rtbcount));
	ASSERT(dqp->q_res_icount >= be64_to_cpu(dqp->q_core.d_icount));

	xfs_dqunlock(dqp);
	return 0;

error_return:
	xfs_dqunlock(dqp);
	if (flags & XFS_QMOPT_ENOSPC)
		return -ENOSPC;
	return -EDQUOT;
}


/*
 * Given dquot(s), make disk block and/or inode reservations against them.
 * The fact that this does the reservation against user, group and
 * project quotas is important, because this follows a all-or-nothing
 * approach.
 *
 * flags = XFS_QMOPT_FORCE_RES evades limit enforcement. Used by chown.
 *	   XFS_QMOPT_ENOSPC returns ENOSPC not EDQUOT.  Used by pquota.
 *	   XFS_TRANS_DQ_RES_BLKS reserves regular disk blocks
 *	   XFS_TRANS_DQ_RES_RTBLKS reserves realtime disk blocks
 * dquots are unlocked on return, if they were not locked by caller.
 */
int
xfs_trans_reserve_quota_bydquots(
	struct xfs_trans	*tp,
	struct xfs_mount	*mp,
	struct xfs_dquot	*udqp,
	struct xfs_dquot	*gdqp,
	struct xfs_dquot	*pdqp,
	long			nblks,
	long			ninos,
	uint			flags)
{
	int		error;

	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
		return 0;

	if (tp && tp->t_dqinfo == NULL)
		xfs_trans_alloc_dqinfo(tp);

	ASSERT(flags & XFS_QMOPT_RESBLK_MASK);

	if (udqp) {
		error = xfs_trans_dqresv(tp, mp, udqp, nblks, ninos,
					(flags & ~XFS_QMOPT_ENOSPC));
		if (error)
			return error;
	}

	if (gdqp) {
		error = xfs_trans_dqresv(tp, mp, gdqp, nblks, ninos, flags);
		if (error)
			goto unwind_usr;
	}

	if (pdqp) {
		error = xfs_trans_dqresv(tp, mp, pdqp, nblks, ninos, flags);
		if (error)
			goto unwind_grp;
	}

	/*
	 * Didn't change anything critical, so, no need to log
	 */
	return 0;

unwind_grp:
	flags |= XFS_QMOPT_FORCE_RES;
	if (gdqp)
		xfs_trans_dqresv(tp, mp, gdqp, -nblks, -ninos, flags);
unwind_usr:
	flags |= XFS_QMOPT_FORCE_RES;
	if (udqp)
		xfs_trans_dqresv(tp, mp, udqp, -nblks, -ninos, flags);
	return error;
}


/*
 * Lock the dquot and change the reservation if we can.
 * This doesn't change the actual usage, just the reservation.
 * The inode sent in is locked.
 */
int
xfs_trans_reserve_quota_nblks(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	long			nblks,
	long			ninos,
	uint			flags)
{
	struct xfs_mount	*mp = ip->i_mount;

	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
		return 0;
	if (XFS_IS_PQUOTA_ON(mp))
		flags |= XFS_QMOPT_ENOSPC;

	ASSERT(!xfs_is_quota_inode(&mp->m_sb, ip->i_ino));

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
	ASSERT((flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
				XFS_TRANS_DQ_RES_RTBLKS ||
	       (flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
				XFS_TRANS_DQ_RES_BLKS);

	/*
	 * Reserve nblks against these dquots, with trans as the mediator.
	 */
	return xfs_trans_reserve_quota_bydquots(tp, mp,
						ip->i_udquot, ip->i_gdquot,
						ip->i_pdquot,
						nblks, ninos, flags);
}

/*
 * This routine is called to allocate a quotaoff log item.
 */
xfs_qoff_logitem_t *
xfs_trans_get_qoff_item(
	xfs_trans_t		*tp,
	xfs_qoff_logitem_t	*startqoff,
	uint			flags)
{
	xfs_qoff_logitem_t	*q;

	ASSERT(tp != NULL);

	q = xfs_qm_qoff_logitem_init(tp->t_mountp, startqoff, flags);
	ASSERT(q != NULL);

	/*
	 * Get a log_item_desc to point at the new item.
	 */
	xfs_trans_add_item(tp, &q->qql_item);
	return q;
}


/*
 * This is called to mark the quotaoff logitem as needing
 * to be logged when the transaction is committed.  The logitem must
 * already be associated with the given transaction.
 */
void
xfs_trans_log_quotaoff_item(
	xfs_trans_t		*tp,
	xfs_qoff_logitem_t	*qlp)
{
	tp->t_flags |= XFS_TRANS_DIRTY;
	qlp->qql_item.li_desc->lid_flags |= XFS_LID_DIRTY;
}

STATIC void
xfs_trans_alloc_dqinfo(
	xfs_trans_t	*tp)
{
	tp->t_dqinfo = kmem_zone_zalloc(xfs_qm_dqtrxzone, KM_SLEEP);
}

void
xfs_trans_free_dqinfo(
	xfs_trans_t	*tp)
{
	if (!tp->t_dqinfo)
		return;
	kmem_zone_free(xfs_qm_dqtrxzone, tp->t_dqinfo);
	tp->t_dqinfo = NULL;
}