1 /*
2  * Copyright (c) 1982, 1986 Regents of the University of California.
3  * All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Robert Elz at The University of Melbourne.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 #ifndef _LINUX_QUOTA_
33 #define _LINUX_QUOTA_
34 
35 #include <linux/list.h>
36 #include <linux/mutex.h>
37 #include <linux/rwsem.h>
38 #include <linux/spinlock.h>
39 #include <linux/wait.h>
40 #include <linux/percpu_counter.h>
41 
42 #include <linux/dqblk_xfs.h>
43 #include <linux/dqblk_v1.h>
44 #include <linux/dqblk_v2.h>
45 
46 #include <linux/atomic.h>
47 #include <linux/uidgid.h>
48 #include <linux/projid.h>
49 #include <uapi/linux/quota.h>
50 
51 #undef USRQUOTA
52 #undef GRPQUOTA
53 #undef PRJQUOTA
54 enum quota_type {
55 	USRQUOTA = 0,		/* element used for user quotas */
56 	GRPQUOTA = 1,		/* element used for group quotas */
57 	PRJQUOTA = 2,		/* element used for project quotas */
58 };
59 
60 /* Masks for quota types when used as a bitmask */
61 #define QTYPE_MASK_USR (1 << USRQUOTA)
62 #define QTYPE_MASK_GRP (1 << GRPQUOTA)
63 #define QTYPE_MASK_PRJ (1 << PRJQUOTA)
64 
65 typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
66 typedef long long qsize_t;	/* Type in which we store sizes */
67 
68 struct kqid {			/* Type in which we store the quota identifier */
69 	union {
70 		kuid_t uid;
71 		kgid_t gid;
72 		kprojid_t projid;
73 	};
74 	enum quota_type type;  /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
75 };
76 
77 extern bool qid_eq(struct kqid left, struct kqid right);
78 extern bool qid_lt(struct kqid left, struct kqid right);
79 extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
80 extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
81 extern bool qid_valid(struct kqid qid);
82 
83 /**
84  *	make_kqid - Map a user-namespace, type, qid tuple into a kqid.
85  *	@from: User namespace that the qid is in
86  *	@type: The type of quota
87  *	@qid: Quota identifier
88  *
89  *	Maps a user-namespace, type qid tuple into a kernel internal
90  *	kqid, and returns that kqid.
91  *
92  *	When there is no mapping defined for the user-namespace, type,
93  *	qid tuple an invalid kqid is returned.  Callers are expected to
94  *	test for and handle invalid kqids being returned.
95  *	Invalid kqids may be tested for using qid_valid().
96  */
make_kqid(struct user_namespace * from,enum quota_type type,qid_t qid)97 static inline struct kqid make_kqid(struct user_namespace *from,
98 				    enum quota_type type, qid_t qid)
99 {
100 	struct kqid kqid;
101 
102 	kqid.type = type;
103 	switch (type) {
104 	case USRQUOTA:
105 		kqid.uid = make_kuid(from, qid);
106 		break;
107 	case GRPQUOTA:
108 		kqid.gid = make_kgid(from, qid);
109 		break;
110 	case PRJQUOTA:
111 		kqid.projid = make_kprojid(from, qid);
112 		break;
113 	default:
114 		BUG();
115 	}
116 	return kqid;
117 }
118 
119 /**
120  *	make_kqid_invalid - Explicitly make an invalid kqid
121  *	@type: The type of quota identifier
122  *
123  *	Returns an invalid kqid with the specified type.
124  */
make_kqid_invalid(enum quota_type type)125 static inline struct kqid make_kqid_invalid(enum quota_type type)
126 {
127 	struct kqid kqid;
128 
129 	kqid.type = type;
130 	switch (type) {
131 	case USRQUOTA:
132 		kqid.uid = INVALID_UID;
133 		break;
134 	case GRPQUOTA:
135 		kqid.gid = INVALID_GID;
136 		break;
137 	case PRJQUOTA:
138 		kqid.projid = INVALID_PROJID;
139 		break;
140 	default:
141 		BUG();
142 	}
143 	return kqid;
144 }
145 
146 /**
147  *	make_kqid_uid - Make a kqid from a kuid
148  *	@uid: The kuid to make the quota identifier from
149  */
make_kqid_uid(kuid_t uid)150 static inline struct kqid make_kqid_uid(kuid_t uid)
151 {
152 	struct kqid kqid;
153 	kqid.type = USRQUOTA;
154 	kqid.uid = uid;
155 	return kqid;
156 }
157 
158 /**
159  *	make_kqid_gid - Make a kqid from a kgid
160  *	@gid: The kgid to make the quota identifier from
161  */
make_kqid_gid(kgid_t gid)162 static inline struct kqid make_kqid_gid(kgid_t gid)
163 {
164 	struct kqid kqid;
165 	kqid.type = GRPQUOTA;
166 	kqid.gid = gid;
167 	return kqid;
168 }
169 
170 /**
171  *	make_kqid_projid - Make a kqid from a projid
172  *	@projid: The kprojid to make the quota identifier from
173  */
make_kqid_projid(kprojid_t projid)174 static inline struct kqid make_kqid_projid(kprojid_t projid)
175 {
176 	struct kqid kqid;
177 	kqid.type = PRJQUOTA;
178 	kqid.projid = projid;
179 	return kqid;
180 }
181 
182 /**
183  *	qid_has_mapping - Report if a qid maps into a user namespace.
184  *	@ns:  The user namespace to see if a value maps into.
185  *	@qid: The kernel internal quota identifier to test.
186  */
qid_has_mapping(struct user_namespace * ns,struct kqid qid)187 static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
188 {
189 	return from_kqid(ns, qid) != (qid_t) -1;
190 }
191 
192 
193 extern spinlock_t dq_data_lock;
194 
195 /* Maximal numbers of writes for quota operation (insert/delete/update)
196  * (over VFS all formats) */
197 #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
198 #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
199 #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
200 #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
201 
202 /*
203  * Data for one user/group kept in memory
204  */
205 struct mem_dqblk {
206 	qsize_t dqb_bhardlimit;	/* absolute limit on disk blks alloc */
207 	qsize_t dqb_bsoftlimit;	/* preferred limit on disk blks */
208 	qsize_t dqb_curspace;	/* current used space */
209 	qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
210 	qsize_t dqb_ihardlimit;	/* absolute limit on allocated inodes */
211 	qsize_t dqb_isoftlimit;	/* preferred inode limit */
212 	qsize_t dqb_curinodes;	/* current # allocated inodes */
213 	time64_t dqb_btime;	/* time limit for excessive disk use */
214 	time64_t dqb_itime;	/* time limit for excessive inode use */
215 };
216 
217 /*
218  * Data for one quotafile kept in memory
219  */
220 struct quota_format_type;
221 
222 struct mem_dqinfo {
223 	struct quota_format_type *dqi_format;
224 	int dqi_fmt_id;		/* Id of the dqi_format - used when turning
225 				 * quotas on after remount RW */
226 	struct list_head dqi_dirty_list;	/* List of dirty dquots [dq_list_lock] */
227 	unsigned long dqi_flags;	/* DFQ_ flags [dq_data_lock] */
228 	unsigned int dqi_bgrace;	/* Space grace time [dq_data_lock] */
229 	unsigned int dqi_igrace;	/* Inode grace time [dq_data_lock] */
230 	qsize_t dqi_max_spc_limit;	/* Maximum space limit [static] */
231 	qsize_t dqi_max_ino_limit;	/* Maximum inode limit [static] */
232 	void *dqi_priv;
233 };
234 
235 struct super_block;
236 
237 /* Mask for flags passed to userspace */
238 #define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE)
239 /* Mask for flags modifiable from userspace */
240 #define DQF_SETINFO_MASK DQF_ROOT_SQUASH
241 
242 enum {
243 	DQF_INFO_DIRTY_B = DQF_PRIVATE,
244 };
245 #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)	/* Is info dirty? */
246 
247 extern void mark_info_dirty(struct super_block *sb, int type);
info_dirty(struct mem_dqinfo * info)248 static inline int info_dirty(struct mem_dqinfo *info)
249 {
250 	return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
251 }
252 
253 enum {
254 	DQST_LOOKUPS,
255 	DQST_DROPS,
256 	DQST_READS,
257 	DQST_WRITES,
258 	DQST_CACHE_HITS,
259 	DQST_ALLOC_DQUOTS,
260 	DQST_FREE_DQUOTS,
261 	DQST_SYNCS,
262 	_DQST_DQSTAT_LAST
263 };
264 
265 struct dqstats {
266 	unsigned long stat[_DQST_DQSTAT_LAST];
267 	struct percpu_counter counter[_DQST_DQSTAT_LAST];
268 };
269 
270 extern struct dqstats dqstats;
271 
dqstats_inc(unsigned int type)272 static inline void dqstats_inc(unsigned int type)
273 {
274 	percpu_counter_inc(&dqstats.counter[type]);
275 }
276 
dqstats_dec(unsigned int type)277 static inline void dqstats_dec(unsigned int type)
278 {
279 	percpu_counter_dec(&dqstats.counter[type]);
280 }
281 
282 #define DQ_MOD_B	0	/* dquot modified since read */
283 #define DQ_BLKS_B	1	/* uid/gid has been warned about blk limit */
284 #define DQ_INODES_B	2	/* uid/gid has been warned about inode limit */
285 #define DQ_FAKE_B	3	/* no limits only usage */
286 #define DQ_READ_B	4	/* dquot was read into memory */
287 #define DQ_ACTIVE_B	5	/* dquot is active (dquot_release not called) */
288 #define DQ_LASTSET_B	6	/* Following 6 bits (see QIF_) are reserved\
289 				 * for the mask of entries set via SETQUOTA\
290 				 * quotactl. They are set under dq_data_lock\
291 				 * and the quota format handling dquot can\
292 				 * clear them when it sees fit. */
293 
294 struct dquot {
295 	struct hlist_node dq_hash;	/* Hash list in memory [dq_list_lock] */
296 	struct list_head dq_inuse;	/* List of all quotas [dq_list_lock] */
297 	struct list_head dq_free;	/* Free list element [dq_list_lock] */
298 	struct list_head dq_dirty;	/* List of dirty dquots [dq_list_lock] */
299 	struct mutex dq_lock;		/* dquot IO lock */
300 	spinlock_t dq_dqb_lock;		/* Lock protecting dq_dqb changes */
301 	atomic_t dq_count;		/* Use count */
302 	struct super_block *dq_sb;	/* superblock this applies to */
303 	struct kqid dq_id;		/* ID this applies to (uid, gid, projid) */
304 	loff_t dq_off;			/* Offset of dquot on disk [dq_lock, stable once set] */
305 	unsigned long dq_flags;		/* See DQ_* */
306 	struct mem_dqblk dq_dqb;	/* Diskquota usage [dq_dqb_lock] */
307 };
308 
309 /* Operations which must be implemented by each quota format */
310 struct quota_format_ops {
311 	int (*check_quota_file)(struct super_block *sb, int type);	/* Detect whether file is in our format */
312 	int (*read_file_info)(struct super_block *sb, int type);	/* Read main info about file - called on quotaon() */
313 	int (*write_file_info)(struct super_block *sb, int type);	/* Write main info about file */
314 	int (*free_file_info)(struct super_block *sb, int type);	/* Called on quotaoff() */
315 	int (*read_dqblk)(struct dquot *dquot);		/* Read structure for one user */
316 	int (*commit_dqblk)(struct dquot *dquot);	/* Write structure for one user */
317 	int (*release_dqblk)(struct dquot *dquot);	/* Called when last reference to dquot is being dropped */
318 	int (*get_next_id)(struct super_block *sb, struct kqid *qid);	/* Get next ID with existing structure in the quota file */
319 };
320 
321 /* Operations working with dquots */
322 struct dquot_operations {
323 	int (*write_dquot) (struct dquot *);		/* Ordinary dquot write */
324 	struct dquot *(*alloc_dquot)(struct super_block *, int);	/* Allocate memory for new dquot */
325 	void (*destroy_dquot)(struct dquot *);		/* Free memory for dquot */
326 	int (*acquire_dquot) (struct dquot *);		/* Quota is going to be created on disk */
327 	int (*release_dquot) (struct dquot *);		/* Quota is going to be deleted from disk */
328 	int (*mark_dirty) (struct dquot *);		/* Dquot is marked dirty */
329 	int (*write_info) (struct super_block *, int);	/* Write of quota "superblock" */
330 	/* get reserved quota for delayed alloc, value returned is managed by
331 	 * quota code only */
332 	qsize_t *(*get_reserved_space) (struct inode *);
333 	int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
334 	/* Get number of inodes that were charged for a given inode */
335 	int (*get_inode_usage) (struct inode *, qsize_t *);
336 	/* Get next ID with active quota structure */
337 	int (*get_next_id) (struct super_block *sb, struct kqid *qid);
338 };
339 
340 struct path;
341 
342 /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
343 struct qc_dqblk {
344 	int d_fieldmask;	/* mask of fields to change in ->set_dqblk() */
345 	u64 d_spc_hardlimit;	/* absolute limit on used space */
346 	u64 d_spc_softlimit;	/* preferred limit on used space */
347 	u64 d_ino_hardlimit;	/* maximum # allocated inodes */
348 	u64 d_ino_softlimit;	/* preferred inode limit */
349 	u64 d_space;		/* Space owned by the user */
350 	u64 d_ino_count;	/* # inodes owned by the user */
351 	s64 d_ino_timer;	/* zero if within inode limits */
352 				/* if not, we refuse service */
353 	s64 d_spc_timer;	/* similar to above; for space */
354 	int d_ino_warns;	/* # warnings issued wrt num inodes */
355 	int d_spc_warns;	/* # warnings issued wrt used space */
356 	u64 d_rt_spc_hardlimit;	/* absolute limit on realtime space */
357 	u64 d_rt_spc_softlimit;	/* preferred limit on RT space */
358 	u64 d_rt_space;		/* realtime space owned */
359 	s64 d_rt_spc_timer;	/* similar to above; for RT space */
360 	int d_rt_spc_warns;	/* # warnings issued wrt RT space */
361 };
362 
363 /*
364  * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
365  * ->set_info() in struct qc_info
366  */
367 #define	QC_INO_SOFT	(1<<0)
368 #define	QC_INO_HARD	(1<<1)
369 #define	QC_SPC_SOFT	(1<<2)
370 #define	QC_SPC_HARD	(1<<3)
371 #define	QC_RT_SPC_SOFT	(1<<4)
372 #define	QC_RT_SPC_HARD	(1<<5)
373 #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
374 		       QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
375 #define	QC_SPC_TIMER	(1<<6)
376 #define	QC_INO_TIMER	(1<<7)
377 #define	QC_RT_SPC_TIMER	(1<<8)
378 #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
379 #define	QC_SPC_WARNS	(1<<9)
380 #define	QC_INO_WARNS	(1<<10)
381 #define	QC_RT_SPC_WARNS	(1<<11)
382 #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
383 #define	QC_SPACE	(1<<12)
384 #define	QC_INO_COUNT	(1<<13)
385 #define	QC_RT_SPACE	(1<<14)
386 #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
387 #define QC_FLAGS	(1<<15)
388 
389 #define QCI_SYSFILE		(1 << 0)	/* Quota file is hidden from userspace */
390 #define QCI_ROOT_SQUASH		(1 << 1)	/* Root squash turned on */
391 #define QCI_ACCT_ENABLED	(1 << 2)	/* Quota accounting enabled */
392 #define QCI_LIMITS_ENFORCED	(1 << 3)	/* Quota limits enforced */
393 
394 /* Structures for communicating via ->get_state */
395 struct qc_type_state {
396 	unsigned int flags;		/* Flags QCI_* */
397 	unsigned int spc_timelimit;	/* Time after which space softlimit is
398 					 * enforced */
399 	unsigned int ino_timelimit;	/* Ditto for inode softlimit */
400 	unsigned int rt_spc_timelimit;	/* Ditto for real-time space */
401 	unsigned int spc_warnlimit;	/* Limit for number of space warnings */
402 	unsigned int ino_warnlimit;	/* Ditto for inodes */
403 	unsigned int rt_spc_warnlimit;	/* Ditto for real-time space */
404 	unsigned long long ino;		/* Inode number of quota file */
405 	blkcnt_t blocks;		/* Number of 512-byte blocks in the file */
406 	blkcnt_t nextents;		/* Number of extents in the file */
407 };
408 
409 struct qc_state {
410 	unsigned int s_incoredqs;	/* Number of dquots in core */
411 	struct qc_type_state s_state[MAXQUOTAS];  /* Per quota type information */
412 };
413 
414 /* Structure for communicating via ->set_info */
415 struct qc_info {
416 	int i_fieldmask;	/* mask of fields to change in ->set_info() */
417 	unsigned int i_flags;		/* Flags QCI_* */
418 	unsigned int i_spc_timelimit;	/* Time after which space softlimit is
419 					 * enforced */
420 	unsigned int i_ino_timelimit;	/* Ditto for inode softlimit */
421 	unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
422 	unsigned int i_spc_warnlimit;	/* Limit for number of space warnings */
423 	unsigned int i_ino_warnlimit;	/* Limit for number of inode warnings */
424 	unsigned int i_rt_spc_warnlimit;	/* Ditto for real-time space */
425 };
426 
427 /* Operations handling requests from userspace */
428 struct quotactl_ops {
429 	int (*quota_on)(struct super_block *, int, int, const struct path *);
430 	int (*quota_off)(struct super_block *, int);
431 	int (*quota_enable)(struct super_block *, unsigned int);
432 	int (*quota_disable)(struct super_block *, unsigned int);
433 	int (*quota_sync)(struct super_block *, int);
434 	int (*set_info)(struct super_block *, int, struct qc_info *);
435 	int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
436 	int (*get_nextdqblk)(struct super_block *, struct kqid *,
437 			     struct qc_dqblk *);
438 	int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
439 	int (*get_state)(struct super_block *, struct qc_state *);
440 	int (*rm_xquota)(struct super_block *, unsigned int);
441 };
442 
443 struct quota_format_type {
444 	int qf_fmt_id;	/* Quota format id */
445 	const struct quota_format_ops *qf_ops;	/* Operations of format */
446 	struct module *qf_owner;		/* Module implementing quota format */
447 	struct quota_format_type *qf_next;
448 };
449 
450 /**
451  * Quota state flags - they come in three flavors - for users, groups and projects.
452  *
453  * Actual typed flags layout:
454  *				USRQUOTA	GRPQUOTA	PRJQUOTA
455  *  DQUOT_USAGE_ENABLED		0x0001		0x0002		0x0004
456  *  DQUOT_LIMITS_ENABLED	0x0008		0x0010		0x0020
457  *  DQUOT_SUSPENDED		0x0040		0x0080		0x0100
458  *
459  * Following bits are used for non-typed flags:
460  *  DQUOT_QUOTA_SYS_FILE	0x0200
461  *  DQUOT_NEGATIVE_USAGE	0x0400
462  *  DQUOT_NOLIST_DIRTY		0x0800
463  */
464 enum {
465 	_DQUOT_USAGE_ENABLED = 0,		/* Track disk usage for users */
466 	_DQUOT_LIMITS_ENABLED,			/* Enforce quota limits for users */
467 	_DQUOT_SUSPENDED,			/* User diskquotas are off, but
468 						 * we have necessary info in
469 						 * memory to turn them on */
470 	_DQUOT_STATE_FLAGS
471 };
472 #define DQUOT_USAGE_ENABLED	(1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
473 #define DQUOT_LIMITS_ENABLED	(1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
474 #define DQUOT_SUSPENDED		(1 << _DQUOT_SUSPENDED * MAXQUOTAS)
475 #define DQUOT_STATE_FLAGS	(DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
476 				 DQUOT_SUSPENDED)
477 /* Other quota flags */
478 #define DQUOT_STATE_LAST	(_DQUOT_STATE_FLAGS * MAXQUOTAS)
479 #define DQUOT_QUOTA_SYS_FILE	(1 << DQUOT_STATE_LAST)
480 						/* Quota file is a special
481 						 * system file and user cannot
482 						 * touch it. Filesystem is
483 						 * responsible for setting
484 						 * S_NOQUOTA, S_NOATIME flags
485 						 */
486 #define DQUOT_NEGATIVE_USAGE	(1 << (DQUOT_STATE_LAST + 1))
487 					       /* Allow negative quota usage */
488 /* Do not track dirty dquots in a list */
489 #define DQUOT_NOLIST_DIRTY	(1 << (DQUOT_STATE_LAST + 2))
490 
dquot_state_flag(unsigned int flags,int type)491 static inline unsigned int dquot_state_flag(unsigned int flags, int type)
492 {
493 	return flags << type;
494 }
495 
dquot_generic_flag(unsigned int flags,int type)496 static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
497 {
498 	return (flags >> type) & DQUOT_STATE_FLAGS;
499 }
500 
501 /* Bitmap of quota types where flag is set in flags */
dquot_state_types(unsigned flags,unsigned flag)502 static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
503 {
504 	BUILD_BUG_ON_NOT_POWER_OF_2(flag);
505 	return (flags / flag) & ((1 << MAXQUOTAS) - 1);
506 }
507 
508 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
509 extern void quota_send_warning(struct kqid qid, dev_t dev,
510 			       const char warntype);
511 #else
quota_send_warning(struct kqid qid,dev_t dev,const char warntype)512 static inline void quota_send_warning(struct kqid qid, dev_t dev,
513 				      const char warntype)
514 {
515 	return;
516 }
517 #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
518 
519 struct quota_info {
520 	unsigned int flags;			/* Flags for diskquotas on this device */
521 	struct rw_semaphore dqio_sem;		/* Lock quota file while I/O in progress */
522 	struct inode *files[MAXQUOTAS];		/* inodes of quotafiles */
523 	struct mem_dqinfo info[MAXQUOTAS];	/* Information for each quota type */
524 	const struct quota_format_ops *ops[MAXQUOTAS];	/* Operations for each type */
525 };
526 
527 int register_quota_format(struct quota_format_type *fmt);
528 void unregister_quota_format(struct quota_format_type *fmt);
529 
530 struct quota_module_name {
531 	int qm_fmt_id;
532 	char *qm_mod_name;
533 };
534 
535 #define INIT_QUOTA_MODULE_NAMES {\
536 	{QFMT_VFS_OLD, "quota_v1"},\
537 	{QFMT_VFS_V0, "quota_v2"},\
538 	{QFMT_VFS_V1, "quota_v2"},\
539 	{0, NULL}}
540 
541 #endif /* _QUOTA_ */
542