summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_qm_syscalls.c
blob: 47fe60e1a887319f2751b3a1a1e46677f2c13bda (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
// 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"

int
xfs_qm_scall_quotaoff(
	xfs_mount_t		*mp,
	uint			flags)
{
	/*
	 * 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;

	/*
	 * We do not support actually turning off quota accounting any more.
	 * Just log a warning and ignore the accounting related flags.
	 */
	if (flags & XFS_ALL_QUOTA_ACCT)
		xfs_info(mp, "disabling of quota accounting not supported.");

	mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
	mp->m_qflags &= ~(flags & XFS_ALL_QUOTA_ENFD);
	spin_lock(&mp->m_sb_lock);
	mp->m_sb.sb_qflags = mp->m_qflags;
	spin_unlock(&mp->m_sb_lock);
	mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);

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

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_disk_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_has_quota(mp) || 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_ON(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;

	/* Flush inodegc work at the start of a quota reporting scan. */
	if (id == 0)
		xfs_inodegc_flush(mp);

	/*
	 * 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;

	/* Flush inodegc work at the start of a quota reporting scan. */
	if (*id == 0)
		xfs_inodegc_flush(mp);

	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;
}