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TOMOYO Linux Cross Reference
Linux/include/linux/quota.h

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  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 handle invalid kqids being returned.
 95  *      Invalid kqids may be tested for using qid_valid().
 96  */
 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  */
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  */
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  */
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  */
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 extern spinlock_t dq_data_lock;
184 
185 /* Maximal numbers of writes for quota operation (insert/delete/update)
186  * (over VFS all formats) */
187 #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
188 #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
189 #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
190 #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
191 
192 /*
193  * Data for one user/group kept in memory
194  */
195 struct mem_dqblk {
196         qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
197         qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
198         qsize_t dqb_curspace;   /* current used space */
199         qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
200         qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
201         qsize_t dqb_isoftlimit; /* preferred inode limit */
202         qsize_t dqb_curinodes;  /* current # allocated inodes */
203         time_t dqb_btime;       /* time limit for excessive disk use */
204         time_t dqb_itime;       /* time limit for excessive inode use */
205 };
206 
207 /*
208  * Data for one quotafile kept in memory
209  */
210 struct quota_format_type;
211 
212 struct mem_dqinfo {
213         struct quota_format_type *dqi_format;
214         int dqi_fmt_id;         /* Id of the dqi_format - used when turning
215                                  * quotas on after remount RW */
216         struct list_head dqi_dirty_list;        /* List of dirty dquots */
217         unsigned long dqi_flags;
218         unsigned int dqi_bgrace;
219         unsigned int dqi_igrace;
220         qsize_t dqi_max_spc_limit;
221         qsize_t dqi_max_ino_limit;
222         void *dqi_priv;
223 };
224 
225 struct super_block;
226 
227 /* Mask for flags passed to userspace */
228 #define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE)
229 /* Mask for flags modifiable from userspace */
230 #define DQF_SETINFO_MASK DQF_ROOT_SQUASH
231 
232 enum {
233         DQF_INFO_DIRTY_B = DQF_PRIVATE,
234 };
235 #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)  /* Is info dirty? */
236 
237 extern void mark_info_dirty(struct super_block *sb, int type);
238 static inline int info_dirty(struct mem_dqinfo *info)
239 {
240         return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
241 }
242 
243 enum {
244         DQST_LOOKUPS,
245         DQST_DROPS,
246         DQST_READS,
247         DQST_WRITES,
248         DQST_CACHE_HITS,
249         DQST_ALLOC_DQUOTS,
250         DQST_FREE_DQUOTS,
251         DQST_SYNCS,
252         _DQST_DQSTAT_LAST
253 };
254 
255 struct dqstats {
256         int stat[_DQST_DQSTAT_LAST];
257         struct percpu_counter counter[_DQST_DQSTAT_LAST];
258 };
259 
260 extern struct dqstats *dqstats_pcpu;
261 extern struct dqstats dqstats;
262 
263 static inline void dqstats_inc(unsigned int type)
264 {
265         percpu_counter_inc(&dqstats.counter[type]);
266 }
267 
268 static inline void dqstats_dec(unsigned int type)
269 {
270         percpu_counter_dec(&dqstats.counter[type]);
271 }
272 
273 #define DQ_MOD_B        0       /* dquot modified since read */
274 #define DQ_BLKS_B       1       /* uid/gid has been warned about blk limit */
275 #define DQ_INODES_B     2       /* uid/gid has been warned about inode limit */
276 #define DQ_FAKE_B       3       /* no limits only usage */
277 #define DQ_READ_B       4       /* dquot was read into memory */
278 #define DQ_ACTIVE_B     5       /* dquot is active (dquot_release not called) */
279 #define DQ_LASTSET_B    6       /* Following 6 bits (see QIF_) are reserved\
280                                  * for the mask of entries set via SETQUOTA\
281                                  * quotactl. They are set under dq_data_lock\
282                                  * and the quota format handling dquot can\
283                                  * clear them when it sees fit. */
284 
285 struct dquot {
286         struct hlist_node dq_hash;      /* Hash list in memory */
287         struct list_head dq_inuse;      /* List of all quotas */
288         struct list_head dq_free;       /* Free list element */
289         struct list_head dq_dirty;      /* List of dirty dquots */
290         struct mutex dq_lock;           /* dquot IO lock */
291         atomic_t dq_count;              /* Use count */
292         wait_queue_head_t dq_wait_unused;       /* Wait queue for dquot to become unused */
293         struct super_block *dq_sb;      /* superblock this applies to */
294         struct kqid dq_id;              /* ID this applies to (uid, gid, projid) */
295         loff_t dq_off;                  /* Offset of dquot on disk */
296         unsigned long dq_flags;         /* See DQ_* */
297         struct mem_dqblk dq_dqb;        /* Diskquota usage */
298 };
299 
300 /* Operations which must be implemented by each quota format */
301 struct quota_format_ops {
302         int (*check_quota_file)(struct super_block *sb, int type);      /* Detect whether file is in our format */
303         int (*read_file_info)(struct super_block *sb, int type);        /* Read main info about file - called on quotaon() */
304         int (*write_file_info)(struct super_block *sb, int type);       /* Write main info about file */
305         int (*free_file_info)(struct super_block *sb, int type);        /* Called on quotaoff() */
306         int (*read_dqblk)(struct dquot *dquot);         /* Read structure for one user */
307         int (*commit_dqblk)(struct dquot *dquot);       /* Write structure for one user */
308         int (*release_dqblk)(struct dquot *dquot);      /* Called when last reference to dquot is being dropped */
309         int (*get_next_id)(struct super_block *sb, struct kqid *qid);   /* Get next ID with existing structure in the quota file */
310 };
311 
312 /* Operations working with dquots */
313 struct dquot_operations {
314         int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
315         struct dquot *(*alloc_dquot)(struct super_block *, int);        /* Allocate memory for new dquot */
316         void (*destroy_dquot)(struct dquot *);          /* Free memory for dquot */
317         int (*acquire_dquot) (struct dquot *);          /* Quota is going to be created on disk */
318         int (*release_dquot) (struct dquot *);          /* Quota is going to be deleted from disk */
319         int (*mark_dirty) (struct dquot *);             /* Dquot is marked dirty */
320         int (*write_info) (struct super_block *, int);  /* Write of quota "superblock" */
321         /* get reserved quota for delayed alloc, value returned is managed by
322          * quota code only */
323         qsize_t *(*get_reserved_space) (struct inode *);
324         int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
325         /* Get next ID with active quota structure */
326         int (*get_next_id) (struct super_block *sb, struct kqid *qid);
327 };
328 
329 struct path;
330 
331 /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
332 struct qc_dqblk {
333         int d_fieldmask;        /* mask of fields to change in ->set_dqblk() */
334         u64 d_spc_hardlimit;    /* absolute limit on used space */
335         u64 d_spc_softlimit;    /* preferred limit on used space */
336         u64 d_ino_hardlimit;    /* maximum # allocated inodes */
337         u64 d_ino_softlimit;    /* preferred inode limit */
338         u64 d_space;            /* Space owned by the user */
339         u64 d_ino_count;        /* # inodes owned by the user */
340         s64 d_ino_timer;        /* zero if within inode limits */
341                                 /* if not, we refuse service */
342         s64 d_spc_timer;        /* similar to above; for space */
343         int d_ino_warns;        /* # warnings issued wrt num inodes */
344         int d_spc_warns;        /* # warnings issued wrt used space */
345         u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */
346         u64 d_rt_spc_softlimit; /* preferred limit on RT space */
347         u64 d_rt_space;         /* realtime space owned */
348         s64 d_rt_spc_timer;     /* similar to above; for RT space */
349         int d_rt_spc_warns;     /* # warnings issued wrt RT space */
350 };
351 
352 /*
353  * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
354  * ->set_info() in struct qc_info
355  */
356 #define QC_INO_SOFT     (1<<0)
357 #define QC_INO_HARD     (1<<1)
358 #define QC_SPC_SOFT     (1<<2)
359 #define QC_SPC_HARD     (1<<3)
360 #define QC_RT_SPC_SOFT  (1<<4)
361 #define QC_RT_SPC_HARD  (1<<5)
362 #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
363                        QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
364 #define QC_SPC_TIMER    (1<<6)
365 #define QC_INO_TIMER    (1<<7)
366 #define QC_RT_SPC_TIMER (1<<8)
367 #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
368 #define QC_SPC_WARNS    (1<<9)
369 #define QC_INO_WARNS    (1<<10)
370 #define QC_RT_SPC_WARNS (1<<11)
371 #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
372 #define QC_SPACE        (1<<12)
373 #define QC_INO_COUNT    (1<<13)
374 #define QC_RT_SPACE     (1<<14)
375 #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
376 #define QC_FLAGS        (1<<15)
377 
378 #define QCI_SYSFILE             (1 << 0)        /* Quota file is hidden from userspace */
379 #define QCI_ROOT_SQUASH         (1 << 1)        /* Root squash turned on */
380 #define QCI_ACCT_ENABLED        (1 << 2)        /* Quota accounting enabled */
381 #define QCI_LIMITS_ENFORCED     (1 << 3)        /* Quota limits enforced */
382 
383 /* Structures for communicating via ->get_state */
384 struct qc_type_state {
385         unsigned int flags;             /* Flags QCI_* */
386         unsigned int spc_timelimit;     /* Time after which space softlimit is
387                                          * enforced */
388         unsigned int ino_timelimit;     /* Ditto for inode softlimit */
389         unsigned int rt_spc_timelimit;  /* Ditto for real-time space */
390         unsigned int spc_warnlimit;     /* Limit for number of space warnings */
391         unsigned int ino_warnlimit;     /* Ditto for inodes */
392         unsigned int rt_spc_warnlimit;  /* Ditto for real-time space */
393         unsigned long long ino;         /* Inode number of quota file */
394         blkcnt_t blocks;                /* Number of 512-byte blocks in the file */
395         blkcnt_t nextents;              /* Number of extents in the file */
396 };
397 
398 struct qc_state {
399         unsigned int s_incoredqs;       /* Number of dquots in core */
400         /*
401          * Per quota type information. The array should really have
402          * max(MAXQUOTAS, XQM_MAXQUOTAS) entries. BUILD_BUG_ON in
403          * quota_getinfo() makes sure XQM_MAXQUOTAS is large enough.  Once VFS
404          * supports project quotas, this can be changed to MAXQUOTAS
405          */
406         struct qc_type_state s_state[XQM_MAXQUOTAS];
407 };
408 
409 /* Structure for communicating via ->set_info */
410 struct qc_info {
411         int i_fieldmask;        /* mask of fields to change in ->set_info() */
412         unsigned int i_flags;           /* Flags QCI_* */
413         unsigned int i_spc_timelimit;   /* Time after which space softlimit is
414                                          * enforced */
415         unsigned int i_ino_timelimit;   /* Ditto for inode softlimit */
416         unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
417         unsigned int i_spc_warnlimit;   /* Limit for number of space warnings */
418         unsigned int i_ino_warnlimit;   /* Limit for number of inode warnings */
419         unsigned int i_rt_spc_warnlimit;        /* Ditto for real-time space */
420 };
421 
422 /* Operations handling requests from userspace */
423 struct quotactl_ops {
424         int (*quota_on)(struct super_block *, int, int, struct path *);
425         int (*quota_off)(struct super_block *, int);
426         int (*quota_enable)(struct super_block *, unsigned int);
427         int (*quota_disable)(struct super_block *, unsigned int);
428         int (*quota_sync)(struct super_block *, int);
429         int (*set_info)(struct super_block *, int, struct qc_info *);
430         int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
431         int (*get_nextdqblk)(struct super_block *, struct kqid *,
432                              struct qc_dqblk *);
433         int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
434         int (*get_state)(struct super_block *, struct qc_state *);
435         int (*rm_xquota)(struct super_block *, unsigned int);
436 };
437 
438 struct quota_format_type {
439         int qf_fmt_id;  /* Quota format id */
440         const struct quota_format_ops *qf_ops;  /* Operations of format */
441         struct module *qf_owner;                /* Module implementing quota format */
442         struct quota_format_type *qf_next;
443 };
444 
445 /**
446  * Quota state flags - they actually come in two flavors - for users and groups.
447  *
448  * Actual typed flags layout:
449  *                              USRQUOTA        GRPQUOTA
450  *  DQUOT_USAGE_ENABLED         0x0001          0x0002
451  *  DQUOT_LIMITS_ENABLED        0x0004          0x0008
452  *  DQUOT_SUSPENDED             0x0010          0x0020
453  *
454  * Following bits are used for non-typed flags:
455  *  DQUOT_QUOTA_SYS_FILE        0x0040
456  *  DQUOT_NEGATIVE_USAGE        0x0080
457  */
458 enum {
459         _DQUOT_USAGE_ENABLED = 0,               /* Track disk usage for users */
460         _DQUOT_LIMITS_ENABLED,                  /* Enforce quota limits for users */
461         _DQUOT_SUSPENDED,                       /* User diskquotas are off, but
462                                                  * we have necessary info in
463                                                  * memory to turn them on */
464         _DQUOT_STATE_FLAGS
465 };
466 #define DQUOT_USAGE_ENABLED     (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
467 #define DQUOT_LIMITS_ENABLED    (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
468 #define DQUOT_SUSPENDED         (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
469 #define DQUOT_STATE_FLAGS       (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
470                                  DQUOT_SUSPENDED)
471 /* Other quota flags */
472 #define DQUOT_STATE_LAST        (_DQUOT_STATE_FLAGS * MAXQUOTAS)
473 #define DQUOT_QUOTA_SYS_FILE    (1 << DQUOT_STATE_LAST)
474                                                 /* Quota file is a special
475                                                  * system file and user cannot
476                                                  * touch it. Filesystem is
477                                                  * responsible for setting
478                                                  * S_NOQUOTA, S_NOATIME flags
479                                                  */
480 #define DQUOT_NEGATIVE_USAGE    (1 << (DQUOT_STATE_LAST + 1))
481                                                /* Allow negative quota usage */
482 static inline unsigned int dquot_state_flag(unsigned int flags, int type)
483 {
484         return flags << type;
485 }
486 
487 static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
488 {
489         return (flags >> type) & DQUOT_STATE_FLAGS;
490 }
491 
492 /* Bitmap of quota types where flag is set in flags */
493 static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
494 {
495         BUILD_BUG_ON_NOT_POWER_OF_2(flag);
496         return (flags / flag) & ((1 << MAXQUOTAS) - 1);
497 }
498 
499 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
500 extern void quota_send_warning(struct kqid qid, dev_t dev,
501                                const char warntype);
502 #else
503 static inline void quota_send_warning(struct kqid qid, dev_t dev,
504                                       const char warntype)
505 {
506         return;
507 }
508 #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
509 
510 struct quota_info {
511         unsigned int flags;                     /* Flags for diskquotas on this device */
512         struct mutex dqio_mutex;                /* lock device while I/O in progress */
513         struct mutex dqonoff_mutex;             /* Serialize quotaon & quotaoff */
514         struct inode *files[MAXQUOTAS];         /* inodes of quotafiles */
515         struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */
516         const struct quota_format_ops *ops[MAXQUOTAS];  /* Operations for each type */
517 };
518 
519 int register_quota_format(struct quota_format_type *fmt);
520 void unregister_quota_format(struct quota_format_type *fmt);
521 
522 struct quota_module_name {
523         int qm_fmt_id;
524         char *qm_mod_name;
525 };
526 
527 #define INIT_QUOTA_MODULE_NAMES {\
528         {QFMT_VFS_OLD, "quota_v1"},\
529         {QFMT_VFS_V0, "quota_v2"},\
530         {QFMT_VFS_V1, "quota_v2"},\
531         {0, NULL}}
532 
533 #endif /* _QUOTA_ */
534 

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