Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 5ac9de4fcd6fcad1ea0baae2a9979e4de264560f (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
/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Elz at The University of Melbourne.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#ifndef _LINUX_QUOTA_
#define _LINUX_QUOTA_

#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/percpu_counter.h>

#include <linux/dqblk_xfs.h>
#include <linux/dqblk_v1.h>
#include <linux/dqblk_v2.h>

#include <linux/atomic.h>
#include <linux/uidgid.h>
#include <linux/projid.h>
#include <uapi/linux/quota.h>

#undef USRQUOTA
#undef GRPQUOTA
#undef PRJQUOTA
enum quota_type {
	USRQUOTA = 0,		/* element used for user quotas */
	GRPQUOTA = 1,		/* element used for group quotas */
	PRJQUOTA = 2,		/* element used for project quotas */
};

/* Masks for quota types when used as a bitmask */
#define QTYPE_MASK_USR (1 << USRQUOTA)
#define QTYPE_MASK_GRP (1 << GRPQUOTA)
#define QTYPE_MASK_PRJ (1 << PRJQUOTA)

typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
typedef long long qsize_t;	/* Type in which we store sizes */

struct kqid {			/* Type in which we store the quota identifier */
	union {
		kuid_t uid;
		kgid_t gid;
		kprojid_t projid;
	};
	enum quota_type type;  /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
};

extern bool qid_eq(struct kqid left, struct kqid right);
extern bool qid_lt(struct kqid left, struct kqid right);
extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
extern bool qid_valid(struct kqid qid);

/**
 *	make_kqid - Map a user-namespace, type, qid tuple into a kqid.
 *	@from: User namespace that the qid is in
 *	@type: The type of quota
 *	@qid: Quota identifier
 *
 *	Maps a user-namespace, type qid tuple into a kernel internal
 *	kqid, and returns that kqid.
 *
 *	When there is no mapping defined for the user-namespace, type,
 *	qid tuple an invalid kqid is returned.  Callers are expected to
 *	test for and handle handle invalid kqids being returned.
 *	Invalid kqids may be tested for using qid_valid().
 */
static inline struct kqid make_kqid(struct user_namespace *from,
				    enum quota_type type, qid_t qid)
{
	struct kqid kqid;

	kqid.type = type;
	switch (type) {
	case USRQUOTA:
		kqid.uid = make_kuid(from, qid);
		break;
	case GRPQUOTA:
		kqid.gid = make_kgid(from, qid);
		break;
	case PRJQUOTA:
		kqid.projid = make_kprojid(from, qid);
		break;
	default:
		BUG();
	}
	return kqid;
}

/**
 *	make_kqid_invalid - Explicitly make an invalid kqid
 *	@type: The type of quota identifier
 *
 *	Returns an invalid kqid with the specified type.
 */
static inline struct kqid make_kqid_invalid(enum quota_type type)
{
	struct kqid kqid;

	kqid.type = type;
	switch (type) {
	case USRQUOTA:
		kqid.uid = INVALID_UID;
		break;
	case GRPQUOTA:
		kqid.gid = INVALID_GID;
		break;
	case PRJQUOTA:
		kqid.projid = INVALID_PROJID;
		break;
	default:
		BUG();
	}
	return kqid;
}

/**
 *	make_kqid_uid - Make a kqid from a kuid
 *	@uid: The kuid to make the quota identifier from
 */
static inline struct kqid make_kqid_uid(kuid_t uid)
{
	struct kqid kqid;
	kqid.type = USRQUOTA;
	kqid.uid = uid;
	return kqid;
}

/**
 *	make_kqid_gid - Make a kqid from a kgid
 *	@gid: The kgid to make the quota identifier from
 */
static inline struct kqid make_kqid_gid(kgid_t gid)
{
	struct kqid kqid;
	kqid.type = GRPQUOTA;
	kqid.gid = gid;
	return kqid;
}

/**
 *	make_kqid_projid - Make a kqid from a projid
 *	@projid: The kprojid to make the quota identifier from
 */
static inline struct kqid make_kqid_projid(kprojid_t projid)
{
	struct kqid kqid;
	kqid.type = PRJQUOTA;
	kqid.projid = projid;
	return kqid;
}

/**
 *	qid_has_mapping - Report if a qid maps into a user namespace.
 *	@ns:  The user namespace to see if a value maps into.
 *	@qid: The kernel internal quota identifier to test.
 */
static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
{
	return from_kqid(ns, qid) != (qid_t) -1;
}


extern spinlock_t dq_data_lock;

/* Maximal numbers of writes for quota operation (insert/delete/update)
 * (over VFS all formats) */
#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)

/*
 * Data for one user/group kept in memory
 */
struct mem_dqblk {
	qsize_t dqb_bhardlimit;	/* absolute limit on disk blks alloc */
	qsize_t dqb_bsoftlimit;	/* preferred limit on disk blks */
	qsize_t dqb_curspace;	/* current used space */
	qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
	qsize_t dqb_ihardlimit;	/* absolute limit on allocated inodes */
	qsize_t dqb_isoftlimit;	/* preferred inode limit */
	qsize_t dqb_curinodes;	/* current # allocated inodes */
	time64_t dqb_btime;	/* time limit for excessive disk use */
	time64_t dqb_itime;	/* time limit for excessive inode use */
};

/*
 * Data for one quotafile kept in memory
 */
struct quota_format_type;

struct mem_dqinfo {
	struct quota_format_type *dqi_format;
	int dqi_fmt_id;		/* Id of the dqi_format - used when turning
				 * quotas on after remount RW */
	struct list_head dqi_dirty_list;	/* List of dirty dquots [dq_list_lock] */
	unsigned long dqi_flags;	/* DFQ_ flags [dq_data_lock] */
	unsigned int dqi_bgrace;	/* Space grace time [dq_data_lock] */
	unsigned int dqi_igrace;	/* Inode grace time [dq_data_lock] */
	qsize_t dqi_max_spc_limit;	/* Maximum space limit [static] */
	qsize_t dqi_max_ino_limit;	/* Maximum inode limit [static] */
	void *dqi_priv;
};

struct super_block;

/* Mask for flags passed to userspace */
#define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE)
/* Mask for flags modifiable from userspace */
#define DQF_SETINFO_MASK DQF_ROOT_SQUASH

enum {
	DQF_INFO_DIRTY_B = DQF_PRIVATE,
};
#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)	/* Is info dirty? */

extern void mark_info_dirty(struct super_block *sb, int type);
static inline int info_dirty(struct mem_dqinfo *info)
{
	return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
}

enum {
	DQST_LOOKUPS,
	DQST_DROPS,
	DQST_READS,
	DQST_WRITES,
	DQST_CACHE_HITS,
	DQST_ALLOC_DQUOTS,
	DQST_FREE_DQUOTS,
	DQST_SYNCS,
	_DQST_DQSTAT_LAST
};

struct dqstats {
	int stat[_DQST_DQSTAT_LAST];
	struct percpu_counter counter[_DQST_DQSTAT_LAST];
};

extern struct dqstats *dqstats_pcpu;
extern struct dqstats dqstats;

static inline void dqstats_inc(unsigned int type)
{
	percpu_counter_inc(&dqstats.counter[type]);
}

static inline void dqstats_dec(unsigned int type)
{
	percpu_counter_dec(&dqstats.counter[type]);
}

#define DQ_MOD_B	0	/* dquot modified since read */
#define DQ_BLKS_B	1	/* uid/gid has been warned about blk limit */
#define DQ_INODES_B	2	/* uid/gid has been warned about inode limit */
#define DQ_FAKE_B	3	/* no limits only usage */
#define DQ_READ_B	4	/* dquot was read into memory */
#define DQ_ACTIVE_B	5	/* dquot is active (dquot_release not called) */
#define DQ_LASTSET_B	6	/* Following 6 bits (see QIF_) are reserved\
				 * for the mask of entries set via SETQUOTA\
				 * quotactl. They are set under dq_data_lock\
				 * and the quota format handling dquot can\
				 * clear them when it sees fit. */

struct dquot {
	struct hlist_node dq_hash;	/* Hash list in memory [dq_list_lock] */
	struct list_head dq_inuse;	/* List of all quotas [dq_list_lock] */
	struct list_head dq_free;	/* Free list element [dq_list_lock] */
	struct list_head dq_dirty;	/* List of dirty dquots [dq_list_lock] */
	struct mutex dq_lock;		/* dquot IO lock */
	spinlock_t dq_dqb_lock;		/* Lock protecting dq_dqb changes */
	atomic_t dq_count;		/* Use count */
	struct super_block *dq_sb;	/* superblock this applies to */
	struct kqid dq_id;		/* ID this applies to (uid, gid, projid) */
	loff_t dq_off;			/* Offset of dquot on disk [dq_lock, stable once set] */
	unsigned long dq_flags;		/* See DQ_* */
	struct mem_dqblk dq_dqb;	/* Diskquota usage [dq_dqb_lock] */
};

/* Operations which must be implemented by each quota format */
struct quota_format_ops {
	int (*check_quota_file)(struct super_block *sb, int type);	/* Detect whether file is in our format */
	int (*read_file_info)(struct super_block *sb, int type);	/* Read main info about file - called on quotaon() */
	int (*write_file_info)(struct super_block *sb, int type);	/* Write main info about file */
	int (*free_file_info)(struct super_block *sb, int type);	/* Called on quotaoff() */
	int (*read_dqblk)(struct dquot *dquot);		/* Read structure for one user */
	int (*commit_dqblk)(struct dquot *dquot);	/* Write structure for one user */
	int (*release_dqblk)(struct dquot *dquot);	/* Called when last reference to dquot is being dropped */
	int (*get_next_id)(struct super_block *sb, struct kqid *qid);	/* Get next ID with existing structure in the quota file */
};

/* Operations working with dquots */
struct dquot_operations {
	int (*write_dquot) (struct dquot *);		/* Ordinary dquot write */
	struct dquot *(*alloc_dquot)(struct super_block *, int);	/* Allocate memory for new dquot */
	void (*destroy_dquot)(struct dquot *);		/* Free memory for dquot */
	int (*acquire_dquot) (struct dquot *);		/* Quota is going to be created on disk */
	int (*release_dquot) (struct dquot *);		/* Quota is going to be deleted from disk */
	int (*mark_dirty) (struct dquot *);		/* Dquot is marked dirty */
	int (*write_info) (struct super_block *, int);	/* Write of quota "superblock" */
	/* get reserved quota for delayed alloc, value returned is managed by
	 * quota code only */
	qsize_t *(*get_reserved_space) (struct inode *);
	int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
	/* Get number of inodes that were charged for a given inode */
	int (*get_inode_usage) (struct inode *, qsize_t *);
	/* Get next ID with active quota structure */
	int (*get_next_id) (struct super_block *sb, struct kqid *qid);
};

struct path;

/* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
struct qc_dqblk {
	int d_fieldmask;	/* mask of fields to change in ->set_dqblk() */
	u64 d_spc_hardlimit;	/* absolute limit on used space */
	u64 d_spc_softlimit;	/* preferred limit on used space */
	u64 d_ino_hardlimit;	/* maximum # allocated inodes */
	u64 d_ino_softlimit;	/* preferred inode limit */
	u64 d_space;		/* Space owned by the user */
	u64 d_ino_count;	/* # inodes owned by the user */
	s64 d_ino_timer;	/* zero if within inode limits */
				/* if not, we refuse service */
	s64 d_spc_timer;	/* similar to above; for space */
	int d_ino_warns;	/* # warnings issued wrt num inodes */
	int d_spc_warns;	/* # warnings issued wrt used space */
	u64 d_rt_spc_hardlimit;	/* absolute limit on realtime space */
	u64 d_rt_spc_softlimit;	/* preferred limit on RT space */
	u64 d_rt_space;		/* realtime space owned */
	s64 d_rt_spc_timer;	/* similar to above; for RT space */
	int d_rt_spc_warns;	/* # warnings issued wrt RT space */
};

/*
 * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
 * ->set_info() in struct qc_info
 */
#define	QC_INO_SOFT	(1<<0)
#define	QC_INO_HARD	(1<<1)
#define	QC_SPC_SOFT	(1<<2)
#define	QC_SPC_HARD	(1<<3)
#define	QC_RT_SPC_SOFT	(1<<4)
#define	QC_RT_SPC_HARD	(1<<5)
#define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
		       QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
#define	QC_SPC_TIMER	(1<<6)
#define	QC_INO_TIMER	(1<<7)
#define	QC_RT_SPC_TIMER	(1<<8)
#define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
#define	QC_SPC_WARNS	(1<<9)
#define	QC_INO_WARNS	(1<<10)
#define	QC_RT_SPC_WARNS	(1<<11)
#define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
#define	QC_SPACE	(1<<12)
#define	QC_INO_COUNT	(1<<13)
#define	QC_RT_SPACE	(1<<14)
#define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
#define QC_FLAGS	(1<<15)

#define QCI_SYSFILE		(1 << 0)	/* Quota file is hidden from userspace */
#define QCI_ROOT_SQUASH		(1 << 1)	/* Root squash turned on */
#define QCI_ACCT_ENABLED	(1 << 2)	/* Quota accounting enabled */
#define QCI_LIMITS_ENFORCED	(1 << 3)	/* Quota limits enforced */

/* Structures for communicating via ->get_state */
struct qc_type_state {
	unsigned int flags;		/* Flags QCI_* */
	unsigned int spc_timelimit;	/* Time after which space softlimit is
					 * enforced */
	unsigned int ino_timelimit;	/* Ditto for inode softlimit */
	unsigned int rt_spc_timelimit;	/* Ditto for real-time space */
	unsigned int spc_warnlimit;	/* Limit for number of space warnings */
	unsigned int ino_warnlimit;	/* Ditto for inodes */
	unsigned int rt_spc_warnlimit;	/* Ditto for real-time space */
	unsigned long long ino;		/* Inode number of quota file */
	blkcnt_t blocks;		/* Number of 512-byte blocks in the file */
	blkcnt_t nextents;		/* Number of extents in the file */
};

struct qc_state {
	unsigned int s_incoredqs;	/* Number of dquots in core */
	/*
	 * Per quota type information. The array should really have
	 * max(MAXQUOTAS, XQM_MAXQUOTAS) entries. BUILD_BUG_ON in
	 * quota_getinfo() makes sure XQM_MAXQUOTAS is large enough.  Once VFS
	 * supports project quotas, this can be changed to MAXQUOTAS
	 */
	struct qc_type_state s_state[XQM_MAXQUOTAS];
};

/* Structure for communicating via ->set_info */
struct qc_info {
	int i_fieldmask;	/* mask of fields to change in ->set_info() */
	unsigned int i_flags;		/* Flags QCI_* */
	unsigned int i_spc_timelimit;	/* Time after which space softlimit is
					 * enforced */
	unsigned int i_ino_timelimit;	/* Ditto for inode softlimit */
	unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
	unsigned int i_spc_warnlimit;	/* Limit for number of space warnings */
	unsigned int i_ino_warnlimit;	/* Limit for number of inode warnings */
	unsigned int i_rt_spc_warnlimit;	/* Ditto for real-time space */
};

/* Operations handling requests from userspace */
struct quotactl_ops {
	int (*quota_on)(struct super_block *, int, int, const struct path *);
	int (*quota_off)(struct super_block *, int);
	int (*quota_enable)(struct super_block *, unsigned int);
	int (*quota_disable)(struct super_block *, unsigned int);
	int (*quota_sync)(struct super_block *, int);
	int (*set_info)(struct super_block *, int, struct qc_info *);
	int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
	int (*get_nextdqblk)(struct super_block *, struct kqid *,
			     struct qc_dqblk *);
	int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
	int (*get_state)(struct super_block *, struct qc_state *);
	int (*rm_xquota)(struct super_block *, unsigned int);
};

struct quota_format_type {
	int qf_fmt_id;	/* Quota format id */
	const struct quota_format_ops *qf_ops;	/* Operations of format */
	struct module *qf_owner;		/* Module implementing quota format */
	struct quota_format_type *qf_next;
};

/**
 * Quota state flags - they actually come in two flavors - for users and groups.
 *
 * Actual typed flags layout:
 *				USRQUOTA	GRPQUOTA
 *  DQUOT_USAGE_ENABLED		0x0001		0x0002
 *  DQUOT_LIMITS_ENABLED	0x0004		0x0008
 *  DQUOT_SUSPENDED		0x0010		0x0020
 *
 * Following bits are used for non-typed flags:
 *  DQUOT_QUOTA_SYS_FILE	0x0040
 *  DQUOT_NEGATIVE_USAGE	0x0080
 */
enum {
	_DQUOT_USAGE_ENABLED = 0,		/* Track disk usage for users */
	_DQUOT_LIMITS_ENABLED,			/* Enforce quota limits for users */
	_DQUOT_SUSPENDED,			/* User diskquotas are off, but
						 * we have necessary info in
						 * memory to turn them on */
	_DQUOT_STATE_FLAGS
};
#define DQUOT_USAGE_ENABLED	(1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
#define DQUOT_LIMITS_ENABLED	(1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
#define DQUOT_SUSPENDED		(1 << _DQUOT_SUSPENDED * MAXQUOTAS)
#define DQUOT_STATE_FLAGS	(DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
				 DQUOT_SUSPENDED)
/* Other quota flags */
#define DQUOT_STATE_LAST	(_DQUOT_STATE_FLAGS * MAXQUOTAS)
#define DQUOT_QUOTA_SYS_FILE	(1 << DQUOT_STATE_LAST)
						/* Quota file is a special
						 * system file and user cannot
						 * touch it. Filesystem is
						 * responsible for setting
						 * S_NOQUOTA, S_NOATIME flags
						 */
#define DQUOT_NEGATIVE_USAGE	(1 << (DQUOT_STATE_LAST + 1))
					       /* Allow negative quota usage */
/* Do not track dirty dquots in a list */
#define DQUOT_NOLIST_DIRTY	(1 << (DQUOT_STATE_LAST + 2))

static inline unsigned int dquot_state_flag(unsigned int flags, int type)
{
	return flags << type;
}

static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
{
	return (flags >> type) & DQUOT_STATE_FLAGS;
}

/* Bitmap of quota types where flag is set in flags */
static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
{
	BUILD_BUG_ON_NOT_POWER_OF_2(flag);
	return (flags / flag) & ((1 << MAXQUOTAS) - 1);
}

#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
extern void quota_send_warning(struct kqid qid, dev_t dev,
			       const char warntype);
#else
static inline void quota_send_warning(struct kqid qid, dev_t dev,
				      const char warntype)
{
	return;
}
#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */

struct quota_info {
	unsigned int flags;			/* Flags for diskquotas on this device */
	struct rw_semaphore dqio_sem;		/* Lock quota file while I/O in progress */
	struct inode *files[MAXQUOTAS];		/* inodes of quotafiles */
	struct mem_dqinfo info[MAXQUOTAS];	/* Information for each quota type */
	const struct quota_format_ops *ops[MAXQUOTAS];	/* Operations for each type */
};

int register_quota_format(struct quota_format_type *fmt);
void unregister_quota_format(struct quota_format_type *fmt);

struct quota_module_name {
	int qm_fmt_id;
	char *qm_mod_name;
};

#define INIT_QUOTA_MODULE_NAMES {\
	{QFMT_VFS_OLD, "quota_v1"},\
	{QFMT_VFS_V0, "quota_v2"},\
	{QFMT_VFS_V1, "quota_v2"},\
	{0, NULL}}

#endif /* _QUOTA_ */