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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  *      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  */
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 */
227         unsigned long dqi_flags;
228         unsigned int dqi_bgrace;
229         unsigned int dqi_igrace;
230         qsize_t dqi_max_spc_limit;
231         qsize_t dqi_max_ino_limit;
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);
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         int stat[_DQST_DQSTAT_LAST];
267         struct percpu_counter counter[_DQST_DQSTAT_LAST];
268 };
269 
270 extern struct dqstats *dqstats_pcpu;
271 extern struct dqstats dqstats;
272 
273 static inline void dqstats_inc(unsigned int type)
274 {
275         percpu_counter_inc(&dqstats.counter[type]);
276 }
277 
278 static inline void dqstats_dec(unsigned int type)
279 {
280         percpu_counter_dec(&dqstats.counter[type]);
281 }
282 
283 #define DQ_MOD_B        0       /* dquot modified since read */
284 #define DQ_BLKS_B       1       /* uid/gid has been warned about blk limit */
285 #define DQ_INODES_B     2       /* uid/gid has been warned about inode limit */
286 #define DQ_FAKE_B       3       /* no limits only usage */
287 #define DQ_READ_B       4       /* dquot was read into memory */
288 #define DQ_ACTIVE_B     5       /* dquot is active (dquot_release not called) */
289 #define DQ_LASTSET_B    6       /* Following 6 bits (see QIF_) are reserved\
290                                  * for the mask of entries set via SETQUOTA\
291                                  * quotactl. They are set under dq_data_lock\
292                                  * and the quota format handling dquot can\
293                                  * clear them when it sees fit. */
294 
295 struct dquot {
296         struct hlist_node dq_hash;      /* Hash list in memory */
297         struct list_head dq_inuse;      /* List of all quotas */
298         struct list_head dq_free;       /* Free list element */
299         struct list_head dq_dirty;      /* List of dirty dquots */
300         struct mutex dq_lock;           /* dquot IO lock */
301         atomic_t dq_count;              /* Use count */
302         wait_queue_head_t dq_wait_unused;       /* Wait queue for dquot to become unused */
303         struct super_block *dq_sb;      /* superblock this applies to */
304         struct kqid dq_id;              /* ID this applies to (uid, gid, projid) */
305         loff_t dq_off;                  /* Offset of dquot on disk */
306         unsigned long dq_flags;         /* See DQ_* */
307         struct mem_dqblk dq_dqb;        /* Diskquota usage */
308 };
309 
310 /* Operations which must be implemented by each quota format */
311 struct quota_format_ops {
312         int (*check_quota_file)(struct super_block *sb, int type);      /* Detect whether file is in our format */
313         int (*read_file_info)(struct super_block *sb, int type);        /* Read main info about file - called on quotaon() */
314         int (*write_file_info)(struct super_block *sb, int type);       /* Write main info about file */
315         int (*free_file_info)(struct super_block *sb, int type);        /* Called on quotaoff() */
316         int (*read_dqblk)(struct dquot *dquot);         /* Read structure for one user */
317         int (*commit_dqblk)(struct dquot *dquot);       /* Write structure for one user */
318         int (*release_dqblk)(struct dquot *dquot);      /* Called when last reference to dquot is being dropped */
319         int (*get_next_id)(struct super_block *sb, struct kqid *qid);   /* Get next ID with existing structure in the quota file */
320 };
321 
322 /* Operations working with dquots */
323 struct dquot_operations {
324         int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
325         struct dquot *(*alloc_dquot)(struct super_block *, int);        /* Allocate memory for new dquot */
326         void (*destroy_dquot)(struct dquot *);          /* Free memory for dquot */
327         int (*acquire_dquot) (struct dquot *);          /* Quota is going to be created on disk */
328         int (*release_dquot) (struct dquot *);          /* Quota is going to be deleted from disk */
329         int (*mark_dirty) (struct dquot *);             /* Dquot is marked dirty */
330         int (*write_info) (struct super_block *, int);  /* Write of quota "superblock" */
331         /* get reserved quota for delayed alloc, value returned is managed by
332          * quota code only */
333         qsize_t *(*get_reserved_space) (struct inode *);
334         int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
335         /* Get next ID with active quota structure */
336         int (*get_next_id) (struct super_block *sb, struct kqid *qid);
337 };
338 
339 struct path;
340 
341 /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
342 struct qc_dqblk {
343         int d_fieldmask;        /* mask of fields to change in ->set_dqblk() */
344         u64 d_spc_hardlimit;    /* absolute limit on used space */
345         u64 d_spc_softlimit;    /* preferred limit on used space */
346         u64 d_ino_hardlimit;    /* maximum # allocated inodes */
347         u64 d_ino_softlimit;    /* preferred inode limit */
348         u64 d_space;            /* Space owned by the user */
349         u64 d_ino_count;        /* # inodes owned by the user */
350         s64 d_ino_timer;        /* zero if within inode limits */
351                                 /* if not, we refuse service */
352         s64 d_spc_timer;        /* similar to above; for space */
353         int d_ino_warns;        /* # warnings issued wrt num inodes */
354         int d_spc_warns;        /* # warnings issued wrt used space */
355         u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */
356         u64 d_rt_spc_softlimit; /* preferred limit on RT space */
357         u64 d_rt_space;         /* realtime space owned */
358         s64 d_rt_spc_timer;     /* similar to above; for RT space */
359         int d_rt_spc_warns;     /* # warnings issued wrt RT space */
360 };
361 
362 /*
363  * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
364  * ->set_info() in struct qc_info
365  */
366 #define QC_INO_SOFT     (1<<0)
367 #define QC_INO_HARD     (1<<1)
368 #define QC_SPC_SOFT     (1<<2)
369 #define QC_SPC_HARD     (1<<3)
370 #define QC_RT_SPC_SOFT  (1<<4)
371 #define QC_RT_SPC_HARD  (1<<5)
372 #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
373                        QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
374 #define QC_SPC_TIMER    (1<<6)
375 #define QC_INO_TIMER    (1<<7)
376 #define QC_RT_SPC_TIMER (1<<8)
377 #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
378 #define QC_SPC_WARNS    (1<<9)
379 #define QC_INO_WARNS    (1<<10)
380 #define QC_RT_SPC_WARNS (1<<11)
381 #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
382 #define QC_SPACE        (1<<12)
383 #define QC_INO_COUNT    (1<<13)
384 #define QC_RT_SPACE     (1<<14)
385 #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
386 #define QC_FLAGS        (1<<15)
387 
388 #define QCI_SYSFILE             (1 << 0)        /* Quota file is hidden from userspace */
389 #define QCI_ROOT_SQUASH         (1 << 1)        /* Root squash turned on */
390 #define QCI_ACCT_ENABLED        (1 << 2)        /* Quota accounting enabled */
391 #define QCI_LIMITS_ENFORCED     (1 << 3)        /* Quota limits enforced */
392 
393 /* Structures for communicating via ->get_state */
394 struct qc_type_state {
395         unsigned int flags;             /* Flags QCI_* */
396         unsigned int spc_timelimit;     /* Time after which space softlimit is
397                                          * enforced */
398         unsigned int ino_timelimit;     /* Ditto for inode softlimit */
399         unsigned int rt_spc_timelimit;  /* Ditto for real-time space */
400         unsigned int spc_warnlimit;     /* Limit for number of space warnings */
401         unsigned int ino_warnlimit;     /* Ditto for inodes */
402         unsigned int rt_spc_warnlimit;  /* Ditto for real-time space */
403         unsigned long long ino;         /* Inode number of quota file */
404         blkcnt_t blocks;                /* Number of 512-byte blocks in the file */
405         blkcnt_t nextents;              /* Number of extents in the file */
406 };
407 
408 struct qc_state {
409         unsigned int s_incoredqs;       /* Number of dquots in core */
410         /*
411          * Per quota type information. The array should really have
412          * max(MAXQUOTAS, XQM_MAXQUOTAS) entries. BUILD_BUG_ON in
413          * quota_getinfo() makes sure XQM_MAXQUOTAS is large enough.  Once VFS
414          * supports project quotas, this can be changed to MAXQUOTAS
415          */
416         struct qc_type_state s_state[XQM_MAXQUOTAS];
417 };
418 
419 /* Structure for communicating via ->set_info */
420 struct qc_info {
421         int i_fieldmask;        /* mask of fields to change in ->set_info() */
422         unsigned int i_flags;           /* Flags QCI_* */
423         unsigned int i_spc_timelimit;   /* Time after which space softlimit is
424                                          * enforced */
425         unsigned int i_ino_timelimit;   /* Ditto for inode softlimit */
426         unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
427         unsigned int i_spc_warnlimit;   /* Limit for number of space warnings */
428         unsigned int i_ino_warnlimit;   /* Limit for number of inode warnings */
429         unsigned int i_rt_spc_warnlimit;        /* Ditto for real-time space */
430 };
431 
432 /* Operations handling requests from userspace */
433 struct quotactl_ops {
434         int (*quota_on)(struct super_block *, int, int, struct path *);
435         int (*quota_off)(struct super_block *, int);
436         int (*quota_enable)(struct super_block *, unsigned int);
437         int (*quota_disable)(struct super_block *, unsigned int);
438         int (*quota_sync)(struct super_block *, int);
439         int (*set_info)(struct super_block *, int, struct qc_info *);
440         int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
441         int (*get_nextdqblk)(struct super_block *, struct kqid *,
442                              struct qc_dqblk *);
443         int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
444         int (*get_state)(struct super_block *, struct qc_state *);
445         int (*rm_xquota)(struct super_block *, unsigned int);
446 };
447 
448 struct quota_format_type {
449         int qf_fmt_id;  /* Quota format id */
450         const struct quota_format_ops *qf_ops;  /* Operations of format */
451         struct module *qf_owner;                /* Module implementing quota format */
452         struct quota_format_type *qf_next;
453 };
454 
455 /**
456  * Quota state flags - they actually come in two flavors - for users and groups.
457  *
458  * Actual typed flags layout:
459  *                              USRQUOTA        GRPQUOTA
460  *  DQUOT_USAGE_ENABLED         0x0001          0x0002
461  *  DQUOT_LIMITS_ENABLED        0x0004          0x0008
462  *  DQUOT_SUSPENDED             0x0010          0x0020
463  *
464  * Following bits are used for non-typed flags:
465  *  DQUOT_QUOTA_SYS_FILE        0x0040
466  *  DQUOT_NEGATIVE_USAGE        0x0080
467  */
468 enum {
469         _DQUOT_USAGE_ENABLED = 0,               /* Track disk usage for users */
470         _DQUOT_LIMITS_ENABLED,                  /* Enforce quota limits for users */
471         _DQUOT_SUSPENDED,                       /* User diskquotas are off, but
472                                                  * we have necessary info in
473                                                  * memory to turn them on */
474         _DQUOT_STATE_FLAGS
475 };
476 #define DQUOT_USAGE_ENABLED     (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
477 #define DQUOT_LIMITS_ENABLED    (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
478 #define DQUOT_SUSPENDED         (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
479 #define DQUOT_STATE_FLAGS       (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
480                                  DQUOT_SUSPENDED)
481 /* Other quota flags */
482 #define DQUOT_STATE_LAST        (_DQUOT_STATE_FLAGS * MAXQUOTAS)
483 #define DQUOT_QUOTA_SYS_FILE    (1 << DQUOT_STATE_LAST)
484                                                 /* Quota file is a special
485                                                  * system file and user cannot
486                                                  * touch it. Filesystem is
487                                                  * responsible for setting
488                                                  * S_NOQUOTA, S_NOATIME flags
489                                                  */
490 #define DQUOT_NEGATIVE_USAGE    (1 << (DQUOT_STATE_LAST + 1))
491                                                /* Allow negative quota usage */
492 static inline unsigned int dquot_state_flag(unsigned int flags, int type)
493 {
494         return flags << type;
495 }
496 
497 static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
498 {
499         return (flags >> type) & DQUOT_STATE_FLAGS;
500 }
501 
502 /* Bitmap of quota types where flag is set in flags */
503 static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
504 {
505         BUILD_BUG_ON_NOT_POWER_OF_2(flag);
506         return (flags / flag) & ((1 << MAXQUOTAS) - 1);
507 }
508 
509 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
510 extern void quota_send_warning(struct kqid qid, dev_t dev,
511                                const char warntype);
512 #else
513 static inline void quota_send_warning(struct kqid qid, dev_t dev,
514                                       const char warntype)
515 {
516         return;
517 }
518 #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
519 
520 struct quota_info {
521         unsigned int flags;                     /* Flags for diskquotas on this device */
522         struct mutex dqio_mutex;                /* lock device while I/O in progress */
523         struct mutex dqonoff_mutex;             /* Serialize quotaon & quotaoff */
524         struct inode *files[MAXQUOTAS];         /* inodes of quotafiles */
525         struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */
526         const struct quota_format_ops *ops[MAXQUOTAS];  /* Operations for each type */
527 };
528 
529 int register_quota_format(struct quota_format_type *fmt);
530 void unregister_quota_format(struct quota_format_type *fmt);
531 
532 struct quota_module_name {
533         int qm_fmt_id;
534         char *qm_mod_name;
535 };
536 
537 #define INIT_QUOTA_MODULE_NAMES {\
538         {QFMT_VFS_OLD, "quota_v1"},\
539         {QFMT_VFS_V0, "quota_v2"},\
540         {QFMT_VFS_V1, "quota_v2"},\
541         {0, NULL}}
542 
543 #endif /* _QUOTA_ */
544 

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