include/linux/quota.h

   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
  33 #ifndef _LINUX_QUOTA_
  34 #define _LINUX_QUOTA_
  35
  36 #include <linux/errno.h>
  37 #include <linux/types.h>
  38
  39 #define __DQUOT_VERSION__       "dquot_6.5.2"
  40
  41 #define MAXQUOTAS 2
  42 #define USRQUOTA  0             /* element used for user quotas */
  43 #define GRPQUOTA  1             /* element used for group quotas */
  44
  45 /*
  46  * Definitions for the default names of the quotas files.
  47  */
  48 #define INITQFNAMES { \
  49         "user",    /* USRQUOTA */ \
  50         "group",   /* GRPQUOTA */ \
  51         "undefined", \
  52 };
  53
  54 /*
  55  * Command definitions for the 'quotactl' system call.
  56  * The commands are broken into a main command defined below
  57  * and a subcommand that is used to convey the type of
  58  * quota that is being manipulated (see above).
  59  */
  60 #define SUBCMDMASK  0x00ff
  61 #define SUBCMDSHIFT 8
  62 #define QCMD(cmd, type)  (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
  63
  64 #define Q_SYNC     0x800001     /* sync disk copy of a filesystems quotas */
  65 #define Q_QUOTAON  0x800002     /* turn quotas on */
  66 #define Q_QUOTAOFF 0x800003     /* turn quotas off */
  67 #define Q_GETFMT   0x800004     /* get quota format used on given filesystem */
  68 #define Q_GETINFO  0x800005     /* get information about quota files */
  69 #define Q_SETINFO  0x800006     /* set information about quota files */
  70 #define Q_GETQUOTA 0x800007     /* get user quota structure */
  71 #define Q_SETQUOTA 0x800008     /* set user quota structure */
  72
  73 /* Quota format type IDs */
  74 #define QFMT_VFS_OLD 1
  75 #define QFMT_VFS_V0 2
  76 #define QFMT_OCFS2 3
  77 #define QFMT_VFS_V1 4
  78
  79 /* Size of block in which space limits are passed through the quota
  80  * interface */
  81 #define QIF_DQBLKSIZE_BITS 10
  82 #define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)
  83
  84 /*
  85  * Quota structure used for communication with userspace via quotactl
  86  * Following flags are used to specify which fields are valid
  87  */
  88 enum {
  89         QIF_BLIMITS_B = 0,
  90         QIF_SPACE_B,
  91         QIF_ILIMITS_B,
  92         QIF_INODES_B,
  93         QIF_BTIME_B,
  94         QIF_ITIME_B,
  95 };
  96
  97 #define QIF_BLIMITS     (1 << QIF_BLIMITS_B)
  98 #define QIF_SPACE       (1 << QIF_SPACE_B)
  99 #define QIF_ILIMITS     (1 << QIF_ILIMITS_B)
 100 #define QIF_INODES      (1 << QIF_INODES_B)
 101 #define QIF_BTIME       (1 << QIF_BTIME_B)
 102 #define QIF_ITIME       (1 << QIF_ITIME_B)
 103 #define QIF_LIMITS      (QIF_BLIMITS | QIF_ILIMITS)
 104 #define QIF_USAGE       (QIF_SPACE | QIF_INODES)
 105 #define QIF_TIMES       (QIF_BTIME | QIF_ITIME)
 106 #define QIF_ALL         (QIF_LIMITS | QIF_USAGE | QIF_TIMES)
 107
 108 struct if_dqblk {
 109         __u64 dqb_bhardlimit;
 110         __u64 dqb_bsoftlimit;
 111         __u64 dqb_curspace;
 112         __u64 dqb_ihardlimit;
 113         __u64 dqb_isoftlimit;
 114         __u64 dqb_curinodes;
 115         __u64 dqb_btime;
 116         __u64 dqb_itime;
 117         __u32 dqb_valid;
 118 };
 119
 120 /*
 121  * Structure used for setting quota information about file via quotactl
 122  * Following flags are used to specify which fields are valid
 123  */
 124 #define IIF_BGRACE      1
 125 #define IIF_IGRACE      2
 126 #define IIF_FLAGS       4
 127 #define IIF_ALL         (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS)
 128
 129 struct if_dqinfo {
 130         __u64 dqi_bgrace;
 131         __u64 dqi_igrace;
 132         __u32 dqi_flags;
 133         __u32 dqi_valid;
 134 };
 135
 136 /*
 137  * Definitions for quota netlink interface
 138  */
 139 #define QUOTA_NL_NOWARN 0
 140 #define QUOTA_NL_IHARDWARN 1            /* Inode hardlimit reached */
 141 #define QUOTA_NL_ISOFTLONGWARN 2        /* Inode grace time expired */
 142 #define QUOTA_NL_ISOFTWARN 3            /* Inode softlimit reached */
 143 #define QUOTA_NL_BHARDWARN 4            /* Block hardlimit reached */
 144 #define QUOTA_NL_BSOFTLONGWARN 5        /* Block grace time expired */
 145 #define QUOTA_NL_BSOFTWARN 6            /* Block softlimit reached */
 146 #define QUOTA_NL_IHARDBELOW 7           /* Usage got below inode hardlimit */
 147 #define QUOTA_NL_ISOFTBELOW 8           /* Usage got below inode softlimit */
 148 #define QUOTA_NL_BHARDBELOW 9           /* Usage got below block hardlimit */
 149 #define QUOTA_NL_BSOFTBELOW 10          /* Usage got below block softlimit */
 150
 151 enum {
 152         QUOTA_NL_C_UNSPEC,
 153         QUOTA_NL_C_WARNING,
 154         __QUOTA_NL_C_MAX,
 155 };
 156 #define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)
 157
 158 enum {
 159         QUOTA_NL_A_UNSPEC,
 160         QUOTA_NL_A_QTYPE,
 161         QUOTA_NL_A_EXCESS_ID,
 162         QUOTA_NL_A_WARNING,
 163         QUOTA_NL_A_DEV_MAJOR,
 164         QUOTA_NL_A_DEV_MINOR,
 165         QUOTA_NL_A_CAUSED_ID,
 166         __QUOTA_NL_A_MAX,
 167 };
 168 #define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)
 169
 170
 171 #ifdef __KERNEL__
 172 #include <linux/list.h>
 173 #include <linux/mutex.h>
 174 #include <linux/rwsem.h>
 175 #include <linux/spinlock.h>
 176 #include <linux/wait.h>
 177 #include <linux/percpu_counter.h>
 178
 179 #include <linux/dqblk_xfs.h>
 180 #include <linux/dqblk_v1.h>
 181 #include <linux/dqblk_v2.h>
 182
 183 #include <linux/atomic.h>
 184 #include <linux/uidgid.h>
 185 #include <linux/projid.h>
 186
 187 #undef USRQUOTA
 188 #undef GRPQUOTA
 189 enum quota_type {
 190         USRQUOTA = 0,           /* element used for user quotas */
 191         GRPQUOTA = 1,           /* element used for group quotas */
 192         PRJQUOTA = 2,           /* element used for project quotas */
 193 };
 194
 195 typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
 196 typedef long long qsize_t;      /* Type in which we store sizes */
 197
 198 struct kqid {                   /* Type in which we store the quota identifier */
 199         union {
 200                 kuid_t uid;
 201                 kgid_t gid;
 202                 kprojid_t projid;
 203         };
 204         enum quota_type type;  /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
 205 };
 206
 207 extern bool qid_eq(struct kqid left, struct kqid right);
 208 extern bool qid_lt(struct kqid left, struct kqid right);
 209 extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
 210 extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
 211 extern bool qid_valid(struct kqid qid);
 212
 213 /**
 214  *      make_kqid - Map a user-namespace, type, qid tuple into a kqid.
 215  *      @from: User namespace that the qid is in
 216  *      @type: The type of quota
 217  *      @qid: Quota identifier
 218  *
 219  *      Maps a user-namespace, type qid tuple into a kernel internal
 220  *      kqid, and returns that kqid.
 221  *
 222  *      When there is no mapping defined for the user-namespace, type,
 223  *      qid tuple an invalid kqid is returned.  Callers are expected to
 224  *      test for and handle handle invalid kqids being returned.
 225  *      Invalid kqids may be tested for using qid_valid().
 226  */
 227 static inline struct kqid make_kqid(struct user_namespace *from,
 228                                     enum quota_type type, qid_t qid)
 229 {
 230         struct kqid kqid;
 231
 232         kqid.type = type;
 233         switch (type) {
 234         case USRQUOTA:
 235                 kqid.uid = make_kuid(from, qid);
 236                 break;
 237         case GRPQUOTA:
 238                 kqid.gid = make_kgid(from, qid);
 239                 break;
 240         case PRJQUOTA:
 241                 kqid.projid = make_kprojid(from, qid);
 242                 break;
 243         default:
 244                 BUG();
 245         }
 246         return kqid;
 247 }
 248
 249 /**
 250  *      make_kqid_invalid - Explicitly make an invalid kqid
 251  *      @type: The type of quota identifier
 252  *
 253  *      Returns an invalid kqid with the specified type.
 254  */
 255 static inline struct kqid make_kqid_invalid(enum quota_type type)
 256 {
 257         struct kqid kqid;
 258
 259         kqid.type = type;
 260         switch (type) {
 261         case USRQUOTA:
 262                 kqid.uid = INVALID_UID;
 263                 break;
 264         case GRPQUOTA:
 265                 kqid.gid = INVALID_GID;
 266                 break;
 267         case PRJQUOTA:
 268                 kqid.projid = INVALID_PROJID;
 269                 break;
 270         default:
 271                 BUG();
 272         }
 273         return kqid;
 274 }
 275
 276 /**
 277  *      make_kqid_uid - Make a kqid from a kuid
 278  *      @uid: The kuid to make the quota identifier from
 279  */
 280 static inline struct kqid make_kqid_uid(kuid_t uid)
 281 {
 282         struct kqid kqid;
 283         kqid.type = USRQUOTA;
 284         kqid.uid = uid;
 285         return kqid;
 286 }
 287
 288 /**
 289  *      make_kqid_gid - Make a kqid from a kgid
 290  *      @gid: The kgid to make the quota identifier from
 291  */
 292 static inline struct kqid make_kqid_gid(kgid_t gid)
 293 {
 294         struct kqid kqid;
 295         kqid.type = GRPQUOTA;
 296         kqid.gid = gid;
 297         return kqid;
 298 }
 299
 300 /**
 301  *      make_kqid_projid - Make a kqid from a projid
 302  *      @projid: The kprojid to make the quota identifier from
 303  */
 304 static inline struct kqid make_kqid_projid(kprojid_t projid)
 305 {
 306         struct kqid kqid;
 307         kqid.type = PRJQUOTA;
 308         kqid.projid = projid;
 309         return kqid;
 310 }
 311
 312
 313 extern spinlock_t dq_data_lock;
 314
 315 /* Maximal numbers of writes for quota operation (insert/delete/update)
 316  * (over VFS all formats) */
 317 #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
 318 #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
 319 #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
 320 #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
 321
 322 /*
 323  * Data for one user/group kept in memory
 324  */
 325 struct mem_dqblk {
 326         qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
 327         qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
 328         qsize_t dqb_curspace;   /* current used space */
 329         qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
 330         qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
 331         qsize_t dqb_isoftlimit; /* preferred inode limit */
 332         qsize_t dqb_curinodes;  /* current # allocated inodes */
 333         time_t dqb_btime;       /* time limit for excessive disk use */
 334         time_t dqb_itime;       /* time limit for excessive inode use */
 335 };
 336
 337 /*
 338  * Data for one quotafile kept in memory
 339  */
 340 struct quota_format_type;
 341
 342 struct mem_dqinfo {
 343         struct quota_format_type *dqi_format;
 344         int dqi_fmt_id;         /* Id of the dqi_format - used when turning
 345                                  * quotas on after remount RW */
 346         struct list_head dqi_dirty_list;        /* List of dirty dquots */
 347         unsigned long dqi_flags;
 348         unsigned int dqi_bgrace;
 349         unsigned int dqi_igrace;
 350         qsize_t dqi_maxblimit;
 351         qsize_t dqi_maxilimit;
 352         void *dqi_priv;
 353 };
 354
 355 struct super_block;
 356
 357 #define DQF_MASK 0xffff         /* Mask for format specific flags */
 358 #define DQF_GETINFO_MASK 0x1ffff        /* Mask for flags passed to userspace */
 359 #define DQF_SETINFO_MASK 0xffff         /* Mask for flags modifiable from userspace */
 360 #define DQF_SYS_FILE_B          16
 361 #define DQF_SYS_FILE (1 << DQF_SYS_FILE_B)      /* Quota file stored as system file */
 362 #define DQF_INFO_DIRTY_B        31
 363 #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)  /* Is info dirty? */
 364
 365 extern void mark_info_dirty(struct super_block *sb, int type);
 366 static inline int info_dirty(struct mem_dqinfo *info)
 367 {
 368         return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
 369 }
 370
 371 enum {
 372         DQST_LOOKUPS,
 373         DQST_DROPS,
 374         DQST_READS,
 375         DQST_WRITES,
 376         DQST_CACHE_HITS,
 377         DQST_ALLOC_DQUOTS,
 378         DQST_FREE_DQUOTS,
 379         DQST_SYNCS,
 380         _DQST_DQSTAT_LAST
 381 };
 382
 383 struct dqstats {
 384         int stat[_DQST_DQSTAT_LAST];
 385         struct percpu_counter counter[_DQST_DQSTAT_LAST];
 386 };
 387
 388 extern struct dqstats *dqstats_pcpu;
 389 extern struct dqstats dqstats;
 390
 391 static inline void dqstats_inc(unsigned int type)
 392 {
 393         percpu_counter_inc(&dqstats.counter[type]);
 394 }
 395
 396 static inline void dqstats_dec(unsigned int type)
 397 {
 398         percpu_counter_dec(&dqstats.counter[type]);
 399 }
 400
 401 #define DQ_MOD_B        0       /* dquot modified since read */
 402 #define DQ_BLKS_B       1       /* uid/gid has been warned about blk limit */
 403 #define DQ_INODES_B     2       /* uid/gid has been warned about inode limit */
 404 #define DQ_FAKE_B       3       /* no limits only usage */
 405 #define DQ_READ_B       4       /* dquot was read into memory */
 406 #define DQ_ACTIVE_B     5       /* dquot is active (dquot_release not called) */
 407 #define DQ_LASTSET_B    6       /* Following 6 bits (see QIF_) are reserved\
 408                                  * for the mask of entries set via SETQUOTA\
 409                                  * quotactl. They are set under dq_data_lock\
 410                                  * and the quota format handling dquot can\
 411                                  * clear them when it sees fit. */
 412
 413 struct dquot {
 414         struct hlist_node dq_hash;      /* Hash list in memory */
 415         struct list_head dq_inuse;      /* List of all quotas */
 416         struct list_head dq_free;       /* Free list element */
 417         struct list_head dq_dirty;      /* List of dirty dquots */
 418         struct mutex dq_lock;           /* dquot IO lock */
 419         atomic_t dq_count;              /* Use count */
 420         wait_queue_head_t dq_wait_unused;       /* Wait queue for dquot to become unused */
 421         struct super_block *dq_sb;      /* superblock this applies to */
 422         struct kqid dq_id;              /* ID this applies to (uid, gid, projid) */
 423         loff_t dq_off;                  /* Offset of dquot on disk */
 424         unsigned long dq_flags;         /* See DQ_* */
 425         struct mem_dqblk dq_dqb;        /* Diskquota usage */
 426 };
 427
 428 /* Operations which must be implemented by each quota format */
 429 struct quota_format_ops {
 430         int (*check_quota_file)(struct super_block *sb, int type);      /* Detect whether file is in our format */
 431         int (*read_file_info)(struct super_block *sb, int type);        /* Read main info about file - called on quotaon() */
 432         int (*write_file_info)(struct super_block *sb, int type);       /* Write main info about file */
 433         int (*free_file_info)(struct super_block *sb, int type);        /* Called on quotaoff() */
 434         int (*read_dqblk)(struct dquot *dquot);         /* Read structure for one user */
 435         int (*commit_dqblk)(struct dquot *dquot);       /* Write structure for one user */
 436         int (*release_dqblk)(struct dquot *dquot);      /* Called when last reference to dquot is being dropped */
 437 };
 438
 439 /* Operations working with dquots */
 440 struct dquot_operations {
 441         int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
 442         struct dquot *(*alloc_dquot)(struct super_block *, int);        /* Allocate memory for new dquot */
 443         void (*destroy_dquot)(struct dquot *);          /* Free memory for dquot */
 444         int (*acquire_dquot) (struct dquot *);          /* Quota is going to be created on disk */
 445         int (*release_dquot) (struct dquot *);          /* Quota is going to be deleted from disk */
 446         int (*mark_dirty) (struct dquot *);             /* Dquot is marked dirty */
 447         int (*write_info) (struct super_block *, int);  /* Write of quota "superblock" */
 448         /* get reserved quota for delayed alloc, value returned is managed by
 449          * quota code only */
 450         qsize_t *(*get_reserved_space) (struct inode *);
 451 };
 452
 453 struct path;
 454
 455 /* Operations handling requests from userspace */
 456 struct quotactl_ops {
 457         int (*quota_on)(struct super_block *, int, int, struct path *);
 458         int (*quota_on_meta)(struct super_block *, int, int);
 459         int (*quota_off)(struct super_block *, int);
 460         int (*quota_sync)(struct super_block *, int);
 461         int (*get_info)(struct super_block *, int, struct if_dqinfo *);
 462         int (*set_info)(struct super_block *, int, struct if_dqinfo *);
 463         int (*get_dqblk)(struct super_block *, struct kqid, struct fs_disk_quota *);
 464         int (*set_dqblk)(struct super_block *, struct kqid, struct fs_disk_quota *);
 465         int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
 466         int (*set_xstate)(struct super_block *, unsigned int, int);
 467 };
 468
 469 struct quota_format_type {
 470         int qf_fmt_id;  /* Quota format id */
 471         const struct quota_format_ops *qf_ops;  /* Operations of format */
 472         struct module *qf_owner;                /* Module implementing quota format */
 473         struct quota_format_type *qf_next;
 474 };
 475
 476 /* Quota state flags - they actually come in two flavors - for users and groups */
 477 enum {
 478         _DQUOT_USAGE_ENABLED = 0,               /* Track disk usage for users */
 479         _DQUOT_LIMITS_ENABLED,                  /* Enforce quota limits for users */
 480         _DQUOT_SUSPENDED,                       /* User diskquotas are off, but
 481                                                  * we have necessary info in
 482                                                  * memory to turn them on */
 483         _DQUOT_STATE_FLAGS
 484 };
 485 #define DQUOT_USAGE_ENABLED     (1 << _DQUOT_USAGE_ENABLED)
 486 #define DQUOT_LIMITS_ENABLED    (1 << _DQUOT_LIMITS_ENABLED)
 487 #define DQUOT_SUSPENDED         (1 << _DQUOT_SUSPENDED)
 488 #define DQUOT_STATE_FLAGS       (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
 489                                  DQUOT_SUSPENDED)
 490 /* Other quota flags */
 491 #define DQUOT_STATE_LAST        (_DQUOT_STATE_FLAGS * MAXQUOTAS)
 492 #define DQUOT_QUOTA_SYS_FILE    (1 << DQUOT_STATE_LAST)
 493                                                 /* Quota file is a special
 494                                                  * system file and user cannot
 495                                                  * touch it. Filesystem is
 496                                                  * responsible for setting
 497                                                  * S_NOQUOTA, S_NOATIME flags
 498                                                  */
 499 #define DQUOT_NEGATIVE_USAGE    (1 << (DQUOT_STATE_LAST + 1))
 500                                                /* Allow negative quota usage */
 501
 502 static inline unsigned int dquot_state_flag(unsigned int flags, int type)
 503 {
 504         return flags << _DQUOT_STATE_FLAGS * type;
 505 }
 506
 507 static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
 508 {
 509         return (flags >> _DQUOT_STATE_FLAGS * type) & DQUOT_STATE_FLAGS;
 510 }
 511
 512 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
 513 extern void quota_send_warning(struct kqid qid, dev_t dev,
 514                                const char warntype);
 515 #else
 516 static inline void quota_send_warning(struct kqid qid, dev_t dev,
 517                                       const char warntype)
 518 {
 519         return;
 520 }
 521 #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
 522
 523 struct quota_info {
 524         unsigned int flags;                     /* Flags for diskquotas on this device */
 525         struct mutex dqio_mutex;                /* lock device while I/O in progress */
 526         struct mutex dqonoff_mutex;             /* Serialize quotaon & quotaoff */
 527         struct rw_semaphore dqptr_sem;          /* serialize ops using quota_info struct, pointers from inode to dquots */
 528         struct inode *files[MAXQUOTAS];         /* inodes of quotafiles */
 529         struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */
 530         const struct quota_format_ops *ops[MAXQUOTAS];  /* Operations for each type */
 531 };
 532
 533 int register_quota_format(struct quota_format_type *fmt);
 534 void unregister_quota_format(struct quota_format_type *fmt);
 535
 536 struct quota_module_name {
 537         int qm_fmt_id;
 538         char *qm_mod_name;
 539 };
 540
 541 #define INIT_QUOTA_MODULE_NAMES {\
 542         {QFMT_VFS_OLD, "quota_v1"},\
 543         {QFMT_VFS_V0, "quota_v2"},\
 544         {0, NULL}}
 545
 546 #endif /* __KERNEL__ */
 547 #endif /* _QUOTA_ */