summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_qm_syscalls.c
blob: ca1b57d291dc90499e78eca871948c9a9c4c143f (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */


#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_sb.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_quota.h"
#include "xfs_qm.h"
#include "xfs_icache.h"

STATIC int
xfs_qm_log_quotaoff(
	struct xfs_mount	*mp,
	struct xfs_qoff_logitem	**qoffstartp,
	uint			flags)
{
	struct xfs_trans	*tp;
	int			error;
	struct xfs_qoff_logitem	*qoffi;

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_quotaoff, 0, 0, 0, &tp);
	if (error)
		goto out;

	qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
	xfs_trans_log_quotaoff_item(tp, qoffi);

	spin_lock(&mp->m_sb_lock);
	mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
	spin_unlock(&mp->m_sb_lock);

	xfs_log_sb(tp);

	/*
	 * We have to make sure that the transaction is secure on disk before we
	 * return and actually stop quota accounting. So, make it synchronous.
	 * We don't care about quotoff's performance.
	 */
	xfs_trans_set_sync(tp);
	error = xfs_trans_commit(tp);
	if (error)
		goto out;

	*qoffstartp = qoffi;
out:
	return error;
}

STATIC int
xfs_qm_log_quotaoff_end(
	struct xfs_mount	*mp,
	struct xfs_qoff_logitem	**startqoff,
	uint			flags)
{
	struct xfs_trans	*tp;
	int			error;
	struct xfs_qoff_logitem	*qoffi;

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_equotaoff, 0, 0, 0, &tp);
	if (error)
		return error;

	qoffi = xfs_trans_get_qoff_item(tp, *startqoff,
					flags & XFS_ALL_QUOTA_ACCT);
	xfs_trans_log_quotaoff_item(tp, qoffi);
	*startqoff = NULL;

	/*
	 * We have to make sure that the transaction is secure on disk before we
	 * return and actually stop quota accounting. So, make it synchronous.
	 * We don't care about quotoff's performance.
	 */
	xfs_trans_set_sync(tp);
	return xfs_trans_commit(tp);
}

/*
 * Turn off quota accounting and/or enforcement for all udquots and/or
 * gdquots. Called only at unmount time.
 *
 * This assumes that there are no dquots of this file system cached
 * incore, and modifies the ondisk dquot directly. Therefore, for example,
 * it is an error to call this twice, without purging the cache.
 */
int
xfs_qm_scall_quotaoff(
	xfs_mount_t		*mp,
	uint			flags)
{
	struct xfs_quotainfo	*q = mp->m_quotainfo;
	uint			dqtype;
	int			error;
	uint			inactivate_flags;
	struct xfs_qoff_logitem	*qoffstart = NULL;

	/*
	 * No file system can have quotas enabled on disk but not in core.
	 * Note that quota utilities (like quotaoff) _expect_
	 * errno == -EEXIST here.
	 */
	if ((mp->m_qflags & flags) == 0)
		return -EEXIST;
	error = 0;

	flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);

	/*
	 * We don't want to deal with two quotaoffs messing up each other,
	 * so we're going to serialize it. quotaoff isn't exactly a performance
	 * critical thing.
	 * If quotaoff, then we must be dealing with the root filesystem.
	 */
	ASSERT(q);
	mutex_lock(&q->qi_quotaofflock);

	/*
	 * If we're just turning off quota enforcement, change mp and go.
	 */
	if ((flags & XFS_ALL_QUOTA_ACCT) == 0) {
		mp->m_qflags &= ~(flags);

		spin_lock(&mp->m_sb_lock);
		mp->m_sb.sb_qflags = mp->m_qflags;
		spin_unlock(&mp->m_sb_lock);
		mutex_unlock(&q->qi_quotaofflock);

		/* XXX what to do if error ? Revert back to old vals incore ? */
		return xfs_sync_sb(mp, false);
	}

	dqtype = 0;
	inactivate_flags = 0;
	/*
	 * If accounting is off, we must turn enforcement off, clear the
	 * quota 'CHKD' certificate to make it known that we have to
	 * do a quotacheck the next time this quota is turned on.
	 */
	if (flags & XFS_UQUOTA_ACCT) {
		dqtype |= XFS_QMOPT_UQUOTA;
		flags |= (XFS_UQUOTA_CHKD | XFS_UQUOTA_ENFD);
		inactivate_flags |= XFS_UQUOTA_ACTIVE;
	}
	if (flags & XFS_GQUOTA_ACCT) {
		dqtype |= XFS_QMOPT_GQUOTA;
		flags |= (XFS_GQUOTA_CHKD | XFS_GQUOTA_ENFD);
		inactivate_flags |= XFS_GQUOTA_ACTIVE;
	}
	if (flags & XFS_PQUOTA_ACCT) {
		dqtype |= XFS_QMOPT_PQUOTA;
		flags |= (XFS_PQUOTA_CHKD | XFS_PQUOTA_ENFD);
		inactivate_flags |= XFS_PQUOTA_ACTIVE;
	}

	/*
	 * Nothing to do?  Don't complain. This happens when we're just
	 * turning off quota enforcement.
	 */
	if ((mp->m_qflags & flags) == 0)
		goto out_unlock;

	/*
	 * Write the LI_QUOTAOFF log record, and do SB changes atomically,
	 * and synchronously. If we fail to write, we should abort the
	 * operation as it cannot be recovered safely if we crash.
	 */
	error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
	if (error)
		goto out_unlock;

	/*
	 * Next we clear the XFS_MOUNT_*DQ_ACTIVE bit(s) in the mount struct
	 * to take care of the race between dqget and quotaoff. We don't take
	 * any special locks to reset these bits. All processes need to check
	 * these bits *after* taking inode lock(s) to see if the particular
	 * quota type is in the process of being turned off. If *ACTIVE, it is
	 * guaranteed that all dquot structures and all quotainode ptrs will all
	 * stay valid as long as that inode is kept locked.
	 *
	 * There is no turning back after this.
	 */
	mp->m_qflags &= ~inactivate_flags;

	/*
	 * Give back all the dquot reference(s) held by inodes.
	 * Here we go thru every single incore inode in this file system, and
	 * do a dqrele on the i_udquot/i_gdquot that it may have.
	 * Essentially, as long as somebody has an inode locked, this guarantees
	 * that quotas will not be turned off. This is handy because in a
	 * transaction once we lock the inode(s) and check for quotaon, we can
	 * depend on the quota inodes (and other things) being valid as long as
	 * we keep the lock(s).
	 */
	xfs_qm_dqrele_all_inodes(mp, flags);

	/*
	 * Next we make the changes in the quota flag in the mount struct.
	 * This isn't protected by a particular lock directly, because we
	 * don't want to take a mrlock every time we depend on quotas being on.
	 */
	mp->m_qflags &= ~flags;

	/*
	 * Go through all the dquots of this file system and purge them,
	 * according to what was turned off.
	 */
	xfs_qm_dqpurge_all(mp, dqtype);

	/*
	 * Transactions that had started before ACTIVE state bit was cleared
	 * could have logged many dquots, so they'd have higher LSNs than
	 * the first QUOTAOFF log record does. If we happen to crash when
	 * the tail of the log has gone past the QUOTAOFF record, but
	 * before the last dquot modification, those dquots __will__
	 * recover, and that's not good.
	 *
	 * So, we have QUOTAOFF start and end logitems; the start
	 * logitem won't get overwritten until the end logitem appears...
	 */
	error = xfs_qm_log_quotaoff_end(mp, &qoffstart, flags);
	if (error) {
		/* We're screwed now. Shutdown is the only option. */
		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
		goto out_unlock;
	}

	/*
	 * If all quotas are completely turned off, close shop.
	 */
	if (mp->m_qflags == 0) {
		mutex_unlock(&q->qi_quotaofflock);
		xfs_qm_destroy_quotainfo(mp);
		return 0;
	}

	/*
	 * Release our quotainode references if we don't need them anymore.
	 */
	if ((dqtype & XFS_QMOPT_UQUOTA) && q->qi_uquotaip) {
		xfs_irele(q->qi_uquotaip);
		q->qi_uquotaip = NULL;
	}
	if ((dqtype & XFS_QMOPT_GQUOTA) && q->qi_gquotaip) {
		xfs_irele(q->qi_gquotaip);
		q->qi_gquotaip = NULL;
	}
	if ((dqtype & XFS_QMOPT_PQUOTA) && q->qi_pquotaip) {
		xfs_irele(q->qi_pquotaip);
		q->qi_pquotaip = NULL;
	}

out_unlock:
	if (error && qoffstart)
		xfs_qm_qoff_logitem_relse(qoffstart);
	mutex_unlock(&q->qi_quotaofflock);
	return error;
}

STATIC int
xfs_qm_scall_trunc_qfile(
	struct xfs_mount	*mp,
	xfs_ino_t		ino)
{
	struct xfs_inode	*ip;
	struct xfs_trans	*tp;
	int			error;

	if (ino == NULLFSINO)
		return 0;

	error = xfs_iget(mp, NULL, ino, 0, 0, &ip);
	if (error)
		return error;

	xfs_ilock(ip, XFS_IOLOCK_EXCL);

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
	if (error) {
		xfs_iunlock(ip, XFS_IOLOCK_EXCL);
		goto out_put;
	}

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, 0);

	ip->i_d.di_size = 0;
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
	if (error) {
		xfs_trans_cancel(tp);
		goto out_unlock;
	}

	ASSERT(ip->i_df.if_nextents == 0);

	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	error = xfs_trans_commit(tp);

out_unlock:
	xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
out_put:
	xfs_irele(ip);
	return error;
}

int
xfs_qm_scall_trunc_qfiles(
	xfs_mount_t	*mp,
	uint		flags)
{
	int		error = -EINVAL;

	if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0 ||
	    (flags & ~XFS_QMOPT_QUOTALL)) {
		xfs_debug(mp, "%s: flags=%x m_qflags=%x",
			__func__, flags, mp->m_qflags);
		return -EINVAL;
	}

	if (flags & XFS_QMOPT_UQUOTA) {
		error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
		if (error)
			return error;
	}
	if (flags & XFS_QMOPT_GQUOTA) {
		error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
		if (error)
			return error;
	}
	if (flags & XFS_QMOPT_PQUOTA)
		error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_pquotino);

	return error;
}

/*
 * Switch on (a given) quota enforcement for a filesystem.  This takes
 * effect immediately.
 * (Switching on quota accounting must be done at mount time.)
 */
int
xfs_qm_scall_quotaon(
	xfs_mount_t	*mp,
	uint		flags)
{
	int		error;
	uint		qf;

	/*
	 * Switching on quota accounting must be done at mount time,
	 * only consider quota enforcement stuff here.
	 */
	flags &= XFS_ALL_QUOTA_ENFD;

	if (flags == 0) {
		xfs_debug(mp, "%s: zero flags, m_qflags=%x",
			__func__, mp->m_qflags);
		return -EINVAL;
	}

	/*
	 * Can't enforce without accounting. We check the superblock
	 * qflags here instead of m_qflags because rootfs can have
	 * quota acct on ondisk without m_qflags' knowing.
	 */
	if (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
	     (flags & XFS_UQUOTA_ENFD)) ||
	    ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
	     (flags & XFS_GQUOTA_ENFD)) ||
	    ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
	     (flags & XFS_PQUOTA_ENFD))) {
		xfs_debug(mp,
			"%s: Can't enforce without acct, flags=%x sbflags=%x",
			__func__, flags, mp->m_sb.sb_qflags);
		return -EINVAL;
	}
	/*
	 * If everything's up to-date incore, then don't waste time.
	 */
	if ((mp->m_qflags & flags) == flags)
		return -EEXIST;

	/*
	 * Change sb_qflags on disk but not incore mp->qflags
	 * if this is the root filesystem.
	 */
	spin_lock(&mp->m_sb_lock);
	qf = mp->m_sb.sb_qflags;
	mp->m_sb.sb_qflags = qf | flags;
	spin_unlock(&mp->m_sb_lock);

	/*
	 * There's nothing to change if it's the same.
	 */
	if ((qf & flags) == flags)
		return -EEXIST;

	error = xfs_sync_sb(mp, false);
	if (error)
		return error;
	/*
	 * If we aren't trying to switch on quota enforcement, we are done.
	 */
	if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
	     (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
	     ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
	     (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
	     ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
	     (mp->m_qflags & XFS_GQUOTA_ACCT)))
		return 0;

	if (! XFS_IS_QUOTA_RUNNING(mp))
		return -ESRCH;

	/*
	 * Switch on quota enforcement in core.
	 */
	mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
	mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
	mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);

	return 0;
}

#define XFS_QC_MASK \
	(QC_LIMIT_MASK | QC_TIMER_MASK | QC_WARNS_MASK)

/*
 * Adjust limits of this quota, and the defaults if passed in.  Returns true
 * if the new limits made sense and were applied, false otherwise.
 */
static inline bool
xfs_setqlim_limits(
	struct xfs_mount	*mp,
	struct xfs_dquot_res	*res,
	struct xfs_quota_limits	*qlim,
	xfs_qcnt_t		hard,
	xfs_qcnt_t		soft,
	const char		*tag)
{
	/* The hard limit can't be less than the soft limit. */
	if (hard != 0 && hard < soft) {
		xfs_debug(mp, "%shard %lld < %ssoft %lld", tag, hard, tag,
				soft);
		return false;
	}

	res->hardlimit = hard;
	res->softlimit = soft;
	if (qlim) {
		qlim->hard = hard;
		qlim->soft = soft;
	}

	return true;
}

static inline void
xfs_setqlim_warns(
	struct xfs_dquot_res	*res,
	struct xfs_quota_limits	*qlim,
	int			warns)
{
	res->warnings = warns;
	if (qlim)
		qlim->warn = warns;
}

static inline void
xfs_setqlim_timer(
	struct xfs_mount	*mp,
	struct xfs_dquot_res	*res,
	struct xfs_quota_limits	*qlim,
	s64			timer)
{
	if (qlim) {
		/* Set the length of the default grace period. */
		res->timer = xfs_dquot_set_grace_period(timer);
		qlim->time = res->timer;
	} else {
		/* Set the grace period expiration on a quota. */
		res->timer = xfs_dquot_set_timeout(mp, timer);
	}
}

/*
 * Adjust quota limits, and start/stop timers accordingly.
 */
int
xfs_qm_scall_setqlim(
	struct xfs_mount	*mp,
	xfs_dqid_t		id,
	xfs_dqtype_t		type,
	struct qc_dqblk		*newlim)
{
	struct xfs_quotainfo	*q = mp->m_quotainfo;
	struct xfs_dquot	*dqp;
	struct xfs_trans	*tp;
	struct xfs_def_quota	*defq;
	struct xfs_dquot_res	*res;
	struct xfs_quota_limits	*qlim;
	int			error;
	xfs_qcnt_t		hard, soft;

	if (newlim->d_fieldmask & ~XFS_QC_MASK)
		return -EINVAL;
	if ((newlim->d_fieldmask & XFS_QC_MASK) == 0)
		return 0;

	/*
	 * We don't want to race with a quotaoff so take the quotaoff lock.
	 * We don't hold an inode lock, so there's nothing else to stop
	 * a quotaoff from happening.
	 */
	mutex_lock(&q->qi_quotaofflock);

	/*
	 * Get the dquot (locked) before we start, as we need to do a
	 * transaction to allocate it if it doesn't exist. Once we have the
	 * dquot, unlock it so we can start the next transaction safely. We hold
	 * a reference to the dquot, so it's safe to do this unlock/lock without
	 * it being reclaimed in the mean time.
	 */
	error = xfs_qm_dqget(mp, id, type, true, &dqp);
	if (error) {
		ASSERT(error != -ENOENT);
		goto out_unlock;
	}

	defq = xfs_get_defquota(q, xfs_dquot_type(dqp));
	xfs_dqunlock(dqp);

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_setqlim, 0, 0, 0, &tp);
	if (error)
		goto out_rele;

	xfs_dqlock(dqp);
	xfs_trans_dqjoin(tp, dqp);

	/*
	 * Update quota limits, warnings, and timers, and the defaults
	 * if we're touching id == 0.
	 *
	 * Make sure that hardlimits are >= soft limits before changing.
	 *
	 * Update warnings counter(s) if requested.
	 *
	 * Timelimits for the super user set the relative time the other users
	 * can be over quota for this file system. If it is zero a default is
	 * used.  Ditto for the default soft and hard limit values (already
	 * done, above), and for warnings.
	 *
	 * For other IDs, userspace can bump out the grace period if over
	 * the soft limit.
	 */

	/* Blocks on the data device. */
	hard = (newlim->d_fieldmask & QC_SPC_HARD) ?
		(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_hardlimit) :
			dqp->q_blk.hardlimit;
	soft = (newlim->d_fieldmask & QC_SPC_SOFT) ?
		(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_softlimit) :
			dqp->q_blk.softlimit;
	res = &dqp->q_blk;
	qlim = id == 0 ? &defq->blk : NULL;

	if (xfs_setqlim_limits(mp, res, qlim, hard, soft, "blk"))
		xfs_dquot_set_prealloc_limits(dqp);
	if (newlim->d_fieldmask & QC_SPC_WARNS)
		xfs_setqlim_warns(res, qlim, newlim->d_spc_warns);
	if (newlim->d_fieldmask & QC_SPC_TIMER)
		xfs_setqlim_timer(mp, res, qlim, newlim->d_spc_timer);

	/* Blocks on the realtime device. */
	hard = (newlim->d_fieldmask & QC_RT_SPC_HARD) ?
		(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_hardlimit) :
			dqp->q_rtb.hardlimit;
	soft = (newlim->d_fieldmask & QC_RT_SPC_SOFT) ?
		(xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_softlimit) :
			dqp->q_rtb.softlimit;
	res = &dqp->q_rtb;
	qlim = id == 0 ? &defq->rtb : NULL;

	xfs_setqlim_limits(mp, res, qlim, hard, soft, "rtb");
	if (newlim->d_fieldmask & QC_RT_SPC_WARNS)
		xfs_setqlim_warns(res, qlim, newlim->d_rt_spc_warns);
	if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
		xfs_setqlim_timer(mp, res, qlim, newlim->d_rt_spc_timer);

	/* Inodes */
	hard = (newlim->d_fieldmask & QC_INO_HARD) ?
		(xfs_qcnt_t) newlim->d_ino_hardlimit :
			dqp->q_ino.hardlimit;
	soft = (newlim->d_fieldmask & QC_INO_SOFT) ?
		(xfs_qcnt_t) newlim->d_ino_softlimit :
			dqp->q_ino.softlimit;
	res = &dqp->q_ino;
	qlim = id == 0 ? &defq->ino : NULL;

	xfs_setqlim_limits(mp, res, qlim, hard, soft, "ino");
	if (newlim->d_fieldmask & QC_INO_WARNS)
		xfs_setqlim_warns(res, qlim, newlim->d_ino_warns);
	if (newlim->d_fieldmask & QC_INO_TIMER)
		xfs_setqlim_timer(mp, res, qlim, newlim->d_ino_timer);

	if (id != 0) {
		/*
		 * If the user is now over quota, start the timelimit.
		 * The user will not be 'warned'.
		 * Note that we keep the timers ticking, whether enforcement
		 * is on or off. We don't really want to bother with iterating
		 * over all ondisk dquots and turning the timers on/off.
		 */
		xfs_qm_adjust_dqtimers(dqp);
	}
	dqp->q_flags |= XFS_DQFLAG_DIRTY;
	xfs_trans_log_dquot(tp, dqp);

	error = xfs_trans_commit(tp);

out_rele:
	xfs_qm_dqrele(dqp);
out_unlock:
	mutex_unlock(&q->qi_quotaofflock);
	return error;
}

/* Fill out the quota context. */
static void
xfs_qm_scall_getquota_fill_qc(
	struct xfs_mount	*mp,
	xfs_dqtype_t		type,
	const struct xfs_dquot	*dqp,
	struct qc_dqblk		*dst)
{
	memset(dst, 0, sizeof(*dst));
	dst->d_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_blk.hardlimit);
	dst->d_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_blk.softlimit);
	dst->d_ino_hardlimit = dqp->q_ino.hardlimit;
	dst->d_ino_softlimit = dqp->q_ino.softlimit;
	dst->d_space = XFS_FSB_TO_B(mp, dqp->q_blk.reserved);
	dst->d_ino_count = dqp->q_ino.reserved;
	dst->d_spc_timer = dqp->q_blk.timer;
	dst->d_ino_timer = dqp->q_ino.timer;
	dst->d_ino_warns = dqp->q_ino.warnings;
	dst->d_spc_warns = dqp->q_blk.warnings;
	dst->d_rt_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.hardlimit);
	dst->d_rt_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.softlimit);
	dst->d_rt_space = XFS_FSB_TO_B(mp, dqp->q_rtb.reserved);
	dst->d_rt_spc_timer = dqp->q_rtb.timer;
	dst->d_rt_spc_warns = dqp->q_rtb.warnings;

	/*
	 * Internally, we don't reset all the timers when quota enforcement
	 * gets turned off. No need to confuse the user level code,
	 * so return zeroes in that case.
	 */
	if (!xfs_dquot_is_enforced(dqp)) {
		dst->d_spc_timer = 0;
		dst->d_ino_timer = 0;
		dst->d_rt_spc_timer = 0;
	}

#ifdef DEBUG
	if (xfs_dquot_is_enforced(dqp) && dqp->q_id != 0) {
		if ((dst->d_space > dst->d_spc_softlimit) &&
		    (dst->d_spc_softlimit > 0)) {
			ASSERT(dst->d_spc_timer != 0);
		}
		if ((dst->d_ino_count > dqp->q_ino.softlimit) &&
		    (dqp->q_ino.softlimit > 0)) {
			ASSERT(dst->d_ino_timer != 0);
		}
	}
#endif
}

/* Return the quota information for the dquot matching id. */
int
xfs_qm_scall_getquota(
	struct xfs_mount	*mp,
	xfs_dqid_t		id,
	xfs_dqtype_t		type,
	struct qc_dqblk		*dst)
{
	struct xfs_dquot	*dqp;
	int			error;

	/*
	 * Try to get the dquot. We don't want it allocated on disk, so don't
	 * set doalloc. If it doesn't exist, we'll get ENOENT back.
	 */
	error = xfs_qm_dqget(mp, id, type, false, &dqp);
	if (error)
		return error;

	/*
	 * If everything's NULL, this dquot doesn't quite exist as far as
	 * our utility programs are concerned.
	 */
	if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
		error = -ENOENT;
		goto out_put;
	}

	xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);

out_put:
	xfs_qm_dqput(dqp);
	return error;
}

/*
 * Return the quota information for the first initialized dquot whose id
 * is at least as high as id.
 */
int
xfs_qm_scall_getquota_next(
	struct xfs_mount	*mp,
	xfs_dqid_t		*id,
	xfs_dqtype_t		type,
	struct qc_dqblk		*dst)
{
	struct xfs_dquot	*dqp;
	int			error;

	error = xfs_qm_dqget_next(mp, *id, type, &dqp);
	if (error)
		return error;

	/* Fill in the ID we actually read from disk */
	*id = dqp->q_id;

	xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);

	xfs_qm_dqput(dqp);
	return error;
}

STATIC int
xfs_dqrele_inode(
	struct xfs_inode	*ip,
	void			*args)
{
	uint			*flags = args;

	/* skip quota inodes */
	if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
	    ip == ip->i_mount->m_quotainfo->qi_gquotaip ||
	    ip == ip->i_mount->m_quotainfo->qi_pquotaip) {
		ASSERT(ip->i_udquot == NULL);
		ASSERT(ip->i_gdquot == NULL);
		ASSERT(ip->i_pdquot == NULL);
		return 0;
	}

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	if ((*flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
		xfs_qm_dqrele(ip->i_udquot);
		ip->i_udquot = NULL;
	}
	if ((*flags & XFS_GQUOTA_ACCT) && ip->i_gdquot) {
		xfs_qm_dqrele(ip->i_gdquot);
		ip->i_gdquot = NULL;
	}
	if ((*flags & XFS_PQUOTA_ACCT) && ip->i_pdquot) {
		xfs_qm_dqrele(ip->i_pdquot);
		ip->i_pdquot = NULL;
	}
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return 0;
}


/*
 * Go thru all the inodes in the file system, releasing their dquots.
 *
 * Note that the mount structure gets modified to indicate that quotas are off
 * AFTER this, in the case of quotaoff.
 */
void
xfs_qm_dqrele_all_inodes(
	struct xfs_mount	*mp,
	uint			flags)
{
	ASSERT(mp->m_quotainfo);
	xfs_inode_walk(mp, XFS_INODE_WALK_INEW_WAIT, xfs_dqrele_inode,
			&flags, XFS_ICI_NO_TAG);
}