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 #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_ */