LXR linux/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#include <linux/rh_kabi.h>
  52
  53#undef USRQUOTA
  54#undef GRPQUOTA
  55#undef PRJQUOTA
  56enum quota_type {
  57        USRQUOTA = 0,           /* element used for user quotas */
  58        GRPQUOTA = 1,           /* element used for group quotas */
  59        PRJQUOTA = 2,           /* element used for project quotas */
  60};
  61
  62/* Masks for quota types when used as a bitmask */
  63#define QTYPE_MASK_USR (1 << USRQUOTA)
  64#define QTYPE_MASK_GRP (1 << GRPQUOTA)
  65#define QTYPE_MASK_PRJ (1 << PRJQUOTA)
  66
  67typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
  68typedef long long qsize_t;      /* Type in which we store sizes */
  69
  70struct kqid {                   /* Type in which we store the quota identifier */
  71        union {
  72                kuid_t uid;
  73                kgid_t gid;
  74                kprojid_t projid;
  75        };
  76        enum quota_type type;  /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
  77};
  78
  79extern bool qid_eq(struct kqid left, struct kqid right);
  80extern bool qid_lt(struct kqid left, struct kqid right);
  81extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
  82extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
  83extern bool qid_valid(struct kqid qid);
  84
  85/**
  86 *      make_kqid - Map a user-namespace, type, qid tuple into a kqid.
  87 *      @from: User namespace that the qid is in
  88 *      @type: The type of quota
  89 *      @qid: Quota identifier
  90 *
  91 *      Maps a user-namespace, type qid tuple into a kernel internal
  92 *      kqid, and returns that kqid.
  93 *
  94 *      When there is no mapping defined for the user-namespace, type,
  95 *      qid tuple an invalid kqid is returned.  Callers are expected to
  96 *      test for and handle handle invalid kqids being returned.
  97 *      Invalid kqids may be tested for using qid_valid().
  98 */
  99static inline struct kqid make_kqid(struct user_namespace *from,
 100                                    enum quota_type type, qid_t qid)
 101{
 102        struct kqid kqid;
 103
 104        kqid.type = type;
 105        switch (type) {
 106        case USRQUOTA:
 107                kqid.uid = make_kuid(from, qid);
 108                break;
 109        case GRPQUOTA:
 110                kqid.gid = make_kgid(from, qid);
 111                break;
 112        case PRJQUOTA:
 113                kqid.projid = make_kprojid(from, qid);
 114                break;
 115        default:
 116                BUG();
 117        }
 118        return kqid;
 119}
 120
 121/**
 122 *      make_kqid_invalid - Explicitly make an invalid kqid
 123 *      @type: The type of quota identifier
 124 *
 125 *      Returns an invalid kqid with the specified type.
 126 */
 127static inline struct kqid make_kqid_invalid(enum quota_type type)
 128{
 129        struct kqid kqid;
 130
 131        kqid.type = type;
 132        switch (type) {
 133        case USRQUOTA:
 134                kqid.uid = INVALID_UID;
 135                break;
 136        case GRPQUOTA:
 137                kqid.gid = INVALID_GID;
 138                break;
 139        case PRJQUOTA:
 140                kqid.projid = INVALID_PROJID;
 141                break;
 142        default:
 143                BUG();
 144        }
 145        return kqid;
 146}
 147
 148/**
 149 *      make_kqid_uid - Make a kqid from a kuid
 150 *      @uid: The kuid to make the quota identifier from
 151 */
 152static inline struct kqid make_kqid_uid(kuid_t uid)
 153{
 154        struct kqid kqid;
 155        kqid.type = USRQUOTA;
 156        kqid.uid = uid;
 157        return kqid;
 158}
 159
 160/**
 161 *      make_kqid_gid - Make a kqid from a kgid
 162 *      @gid: The kgid to make the quota identifier from
 163 */
 164static inline struct kqid make_kqid_gid(kgid_t gid)
 165{
 166        struct kqid kqid;
 167        kqid.type = GRPQUOTA;
 168        kqid.gid = gid;
 169        return kqid;
 170}
 171
 172/**
 173 *      make_kqid_projid - Make a kqid from a projid
 174 *      @projid: The kprojid to make the quota identifier from
 175 */
 176static inline struct kqid make_kqid_projid(kprojid_t projid)
 177{
 178        struct kqid kqid;
 179        kqid.type = PRJQUOTA;
 180        kqid.projid = projid;
 181        return kqid;
 182}
 183
 184/**
 185 *      qid_has_mapping - Report if a qid maps into a user namespace.
 186 *      @ns:  The user namespace to see if a value maps into.
 187 *      @qid: The kernel internal quota identifier to test.
 188 */
 189static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
 190{
 191        return from_kqid(ns, qid) != (qid_t) -1;
 192}
 193
 194
 195extern spinlock_t dq_data_lock;
 196
 197/* Maximal numbers of writes for quota operation (insert/delete/update)
 198 * (over VFS all formats) */
 199#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
 200#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
 201#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
 202#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
 203
 204/*
 205 * Data for one user/group kept in memory
 206 */
 207struct mem_dqblk {
 208        qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
 209        qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
 210        qsize_t dqb_curspace;   /* current used space */
 211        qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
 212        qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
 213        qsize_t dqb_isoftlimit; /* preferred inode limit */
 214        qsize_t dqb_curinodes;  /* current # allocated inodes */
 215        time64_t dqb_btime;     /* time limit for excessive disk use */
 216        time64_t dqb_itime;     /* time limit for excessive inode use */
 217};
 218
 219/*
 220 * Data for one quotafile kept in memory
 221 */
 222struct quota_format_type;
 223
 224struct mem_dqinfo {
 225        struct quota_format_type *dqi_format;
 226        int dqi_fmt_id;         /* Id of the dqi_format - used when turning
 227                                 * quotas on after remount RW */
 228        struct list_head dqi_dirty_list;        /* List of dirty dquots [dq_list_lock] */
 229        unsigned long dqi_flags;        /* DFQ_ flags [dq_data_lock] */
 230        unsigned int dqi_bgrace;        /* Space grace time [dq_data_lock] */
 231        unsigned int dqi_igrace;        /* Inode grace time [dq_data_lock] */
 232        qsize_t dqi_max_spc_limit;      /* Maximum space limit [static] */
 233        qsize_t dqi_max_ino_limit;      /* Maximum inode limit [static] */
 234        void *dqi_priv;
 235};
 236
 237struct super_block;
 238
 239/* Mask for flags passed to userspace */
 240#define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE)
 241/* Mask for flags modifiable from userspace */
 242#define DQF_SETINFO_MASK DQF_ROOT_SQUASH
 243
 244enum {
 245        DQF_INFO_DIRTY_B = DQF_PRIVATE,
 246};
 247#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)  /* Is info dirty? */
 248
 249extern void mark_info_dirty(struct super_block *sb, int type);
 250static inline int info_dirty(struct mem_dqinfo *info)
 251{
 252        return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
 253}
 254
 255enum {
 256        DQST_LOOKUPS,
 257        DQST_DROPS,
 258        DQST_READS,
 259        DQST_WRITES,
 260        DQST_CACHE_HITS,
 261        DQST_ALLOC_DQUOTS,
 262        DQST_FREE_DQUOTS,
 263        DQST_SYNCS,
 264        _DQST_DQSTAT_LAST
 265};
 266
 267struct dqstats {
 268        int stat[_DQST_DQSTAT_LAST];
 269        struct percpu_counter counter[_DQST_DQSTAT_LAST];
 270};
 271
 272extern struct dqstats dqstats;
 273
 274static inline void dqstats_inc(unsigned int type)
 275{
 276        percpu_counter_inc(&dqstats.counter[type]);
 277}
 278
 279static inline void dqstats_dec(unsigned int type)
 280{
 281        percpu_counter_dec(&dqstats.counter[type]);
 282}
 283
 284#define DQ_MOD_B        0       /* dquot modified since read */
 285#define DQ_BLKS_B       1       /* uid/gid has been warned about blk limit */
 286#define DQ_INODES_B     2       /* uid/gid has been warned about inode limit */
 287#define DQ_FAKE_B       3       /* no limits only usage */
 288#define DQ_READ_B       4       /* dquot was read into memory */
 289#define DQ_ACTIVE_B     5       /* dquot is active (dquot_release not called) */
 290#define DQ_LASTSET_B    6       /* Following 6 bits (see QIF_) are reserved\
 291                                 * for the mask of entries set via SETQUOTA\
 292                                 * quotactl. They are set under dq_data_lock\
 293                                 * and the quota format handling dquot can\
 294                                 * clear them when it sees fit. */
 295
 296struct dquot {
 297        struct hlist_node dq_hash;      /* Hash list in memory [dq_list_lock] */
 298        struct list_head dq_inuse;      /* List of all quotas [dq_list_lock] */
 299        struct list_head dq_free;       /* Free list element [dq_list_lock] */
 300        struct list_head dq_dirty;      /* List of dirty dquots [dq_list_lock] */
 301        struct mutex dq_lock;           /* dquot IO lock */
 302        spinlock_t dq_dqb_lock;         /* Lock protecting dq_dqb changes */
 303        atomic_t dq_count;              /* Use count */
 304        struct super_block *dq_sb;      /* superblock this applies to */
 305        struct kqid dq_id;              /* ID this applies to (uid, gid, projid) */
 306        loff_t dq_off;                  /* Offset of dquot on disk [dq_lock, stable once set] */
 307        unsigned long dq_flags;         /* See DQ_* */
 308        struct mem_dqblk dq_dqb;        /* Diskquota usage [dq_dqb_lock] */
 309};
 310
 311/* Operations which must be implemented by each quota format */
 312struct quota_format_ops {
 313        int (*check_quota_file)(struct super_block *sb, int type);      /* Detect whether file is in our format */
 314        int (*read_file_info)(struct super_block *sb, int type);        /* Read main info about file - called on quotaon() */
 315        int (*write_file_info)(struct super_block *sb, int type);       /* Write main info about file */
 316        int (*free_file_info)(struct super_block *sb, int type);        /* Called on quotaoff() */
 317        int (*read_dqblk)(struct dquot *dquot);         /* Read structure for one user */
 318        int (*commit_dqblk)(struct dquot *dquot);       /* Write structure for one user */
 319        int (*release_dqblk)(struct dquot *dquot);      /* Called when last reference to dquot is being dropped */
 320        int (*get_next_id)(struct super_block *sb, struct kqid *qid);   /* Get next ID with existing structure in the quota file */
 321        RH_KABI_RESERVE(1)
 322        RH_KABI_RESERVE(2)
 323};
 324
 325/* Operations working with dquots */
 326struct dquot_operations {
 327        int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
 328        struct dquot *(*alloc_dquot)(struct super_block *, int);        /* Allocate memory for new dquot */
 329        void (*destroy_dquot)(struct dquot *);          /* Free memory for dquot */
 330        int (*acquire_dquot) (struct dquot *);          /* Quota is going to be created on disk */
 331        int (*release_dquot) (struct dquot *);          /* Quota is going to be deleted from disk */
 332        int (*mark_dirty) (struct dquot *);             /* Dquot is marked dirty */
 333        int (*write_info) (struct super_block *, int);  /* Write of quota "superblock" */
 334        /* get reserved quota for delayed alloc, value returned is managed by
 335         * quota code only */
 336        qsize_t *(*get_reserved_space) (struct inode *);
 337        int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
 338        /* Get number of inodes that were charged for a given inode */
 339        int (*get_inode_usage) (struct inode *, qsize_t *);
 340        /* Get next ID with active quota structure */
 341        int (*get_next_id) (struct super_block *sb, struct kqid *qid);
 342        RH_KABI_RESERVE(1)
 343        RH_KABI_RESERVE(2)
 344};
 345
 346struct path;
 347
 348/* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
 349struct qc_dqblk {
 350        int d_fieldmask;        /* mask of fields to change in ->set_dqblk() */
 351        u64 d_spc_hardlimit;    /* absolute limit on used space */
 352        u64 d_spc_softlimit;    /* preferred limit on used space */
 353        u64 d_ino_hardlimit;    /* maximum # allocated inodes */
 354        u64 d_ino_softlimit;    /* preferred inode limit */
 355        u64 d_space;            /* Space owned by the user */
 356        u64 d_ino_count;        /* # inodes owned by the user */
 357        s64 d_ino_timer;        /* zero if within inode limits */
 358                                /* if not, we refuse service */
 359        s64 d_spc_timer;        /* similar to above; for space */
 360        int d_ino_warns;        /* # warnings issued wrt num inodes */
 361        int d_spc_warns;        /* # warnings issued wrt used space */
 362        u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */
 363        u64 d_rt_spc_softlimit; /* preferred limit on RT space */
 364        u64 d_rt_space;         /* realtime space owned */
 365        s64 d_rt_spc_timer;     /* similar to above; for RT space */
 366        int d_rt_spc_warns;     /* # warnings issued wrt RT space */
 367};
 368
 369/*
 370 * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
 371 * ->set_info() in struct qc_info
 372 */
 373#define QC_INO_SOFT     (1<<0)
 374#define QC_INO_HARD     (1<<1)
 375#define QC_SPC_SOFT     (1<<2)
 376#define QC_SPC_HARD     (1<<3)
 377#define QC_RT_SPC_SOFT  (1<<4)
 378#define QC_RT_SPC_HARD  (1<<5)
 379#define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
 380                       QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
 381#define QC_SPC_TIMER    (1<<6)
 382#define QC_INO_TIMER    (1<<7)
 383#define QC_RT_SPC_TIMER (1<<8)
 384#define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
 385#define QC_SPC_WARNS    (1<<9)
 386#define QC_INO_WARNS    (1<<10)
 387#define QC_RT_SPC_WARNS (1<<11)
 388#define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
 389#define QC_SPACE        (1<<12)
 390#define QC_INO_COUNT    (1<<13)
 391#define QC_RT_SPACE     (1<<14)
 392#define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
 393#define QC_FLAGS        (1<<15)
 394
 395#define QCI_SYSFILE             (1 << 0)        /* Quota file is hidden from userspace */
 396#define QCI_ROOT_SQUASH         (1 << 1)        /* Root squash turned on */
 397#define QCI_ACCT_ENABLED        (1 << 2)        /* Quota accounting enabled */
 398#define QCI_LIMITS_ENFORCED     (1 << 3)        /* Quota limits enforced */
 399
 400/* Structures for communicating via ->get_state */
 401struct qc_type_state {
 402        unsigned int flags;             /* Flags QCI_* */
 403        unsigned int spc_timelimit;     /* Time after which space softlimit is
 404                                         * enforced */
 405        unsigned int ino_timelimit;     /* Ditto for inode softlimit */
 406        unsigned int rt_spc_timelimit;  /* Ditto for real-time space */
 407        unsigned int spc_warnlimit;     /* Limit for number of space warnings */
 408        unsigned int ino_warnlimit;     /* Ditto for inodes */
 409        unsigned int rt_spc_warnlimit;  /* Ditto for real-time space */
 410        unsigned long long ino;         /* Inode number of quota file */
 411        blkcnt_t blocks;                /* Number of 512-byte blocks in the file */
 412        blkcnt_t nextents;              /* Number of extents in the file */
 413};
 414
 415struct qc_state {
 416        unsigned int s_incoredqs;       /* Number of dquots in core */
 417        struct qc_type_state s_state[MAXQUOTAS];  /* Per quota type information */
 418};
 419
 420/* Structure for communicating via ->set_info */
 421struct qc_info {
 422        int i_fieldmask;        /* mask of fields to change in ->set_info() */
 423        unsigned int i_flags;           /* Flags QCI_* */
 424        unsigned int i_spc_timelimit;   /* Time after which space softlimit is
 425                                         * enforced */
 426        unsigned int i_ino_timelimit;   /* Ditto for inode softlimit */
 427        unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
 428        unsigned int i_spc_warnlimit;   /* Limit for number of space warnings */
 429        unsigned int i_ino_warnlimit;   /* Limit for number of inode warnings */
 430        unsigned int i_rt_spc_warnlimit;        /* Ditto for real-time space */
 431};
 432
 433/* Operations handling requests from userspace */
 434struct quotactl_ops {
 435        int (*quota_on)(struct super_block *, int, int, const struct path *);
 436        int (*quota_off)(struct super_block *, int);
 437        int (*quota_enable)(struct super_block *, unsigned int);
 438        int (*quota_disable)(struct super_block *, unsigned int);
 439        int (*quota_sync)(struct super_block *, int);
 440        int (*set_info)(struct super_block *, int, struct qc_info *);
 441        int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
 442        int (*get_nextdqblk)(struct super_block *, struct kqid *,
 443                             struct qc_dqblk *);
 444        int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
 445        int (*get_state)(struct super_block *, struct qc_state *);
 446        int (*rm_xquota)(struct super_block *, unsigned int);
 447        RH_KABI_RESERVE(1)
 448        RH_KABI_RESERVE(2)
 449        RH_KABI_RESERVE(3)
 450        RH_KABI_RESERVE(4)
 451};
 452
 453struct quota_format_type {
 454        int qf_fmt_id;  /* Quota format id */
 455        const struct quota_format_ops *qf_ops;  /* Operations of format */
 456        struct module *qf_owner;                /* Module implementing quota format */
 457        struct quota_format_type *qf_next;
 458};
 459
 460/**
 461 * Quota state flags - they actually come in two flavors - for users and groups.
 462 *
 463 * Actual typed flags layout:
 464 *                              USRQUOTA        GRPQUOTA
 465 *  DQUOT_USAGE_ENABLED         0x0001          0x0002
 466 *  DQUOT_LIMITS_ENABLED        0x0004          0x0008
 467 *  DQUOT_SUSPENDED             0x0010          0x0020
 468 *
 469 * Following bits are used for non-typed flags:
 470 *  DQUOT_QUOTA_SYS_FILE        0x0040
 471 *  DQUOT_NEGATIVE_USAGE        0x0080
 472 */
 473enum {
 474        _DQUOT_USAGE_ENABLED = 0,               /* Track disk usage for users */
 475        _DQUOT_LIMITS_ENABLED,                  /* Enforce quota limits for users */
 476        _DQUOT_SUSPENDED,                       /* User diskquotas are off, but
 477                                                 * we have necessary info in
 478                                                 * memory to turn them on */
 479        _DQUOT_STATE_FLAGS
 480};
 481#define DQUOT_USAGE_ENABLED     (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
 482#define DQUOT_LIMITS_ENABLED    (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
 483#define DQUOT_SUSPENDED         (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
 484#define DQUOT_STATE_FLAGS       (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
 485                                 DQUOT_SUSPENDED)
 486/* Other quota flags */
 487#define DQUOT_STATE_LAST        (_DQUOT_STATE_FLAGS * MAXQUOTAS)
 488#define DQUOT_QUOTA_SYS_FILE    (1 << DQUOT_STATE_LAST)
 489                                                /* Quota file is a special
 490                                                 * system file and user cannot
 491                                                 * touch it. Filesystem is
 492                                                 * responsible for setting
 493                                                 * S_NOQUOTA, S_NOATIME flags
 494                                                 */
 495#define DQUOT_NEGATIVE_USAGE    (1 << (DQUOT_STATE_LAST + 1))
 496                                               /* Allow negative quota usage */
 497/* Do not track dirty dquots in a list */
 498#define DQUOT_NOLIST_DIRTY      (1 << (DQUOT_STATE_LAST + 2))
 499
 500static inline unsigned int dquot_state_flag(unsigned int flags, int type)
 501{
 502        return flags << type;
 503}
 504
 505static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
 506{
 507        return (flags >> type) & DQUOT_STATE_FLAGS;
 508}
 509
 510/* Bitmap of quota types where flag is set in flags */
 511static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
 512{
 513        BUILD_BUG_ON_NOT_POWER_OF_2(flag);
 514        return (flags / flag) & ((1 << MAXQUOTAS) - 1);
 515}
 516
 517#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
 518extern void quota_send_warning(struct kqid qid, dev_t dev,
 519                               const char warntype);
 520#else
 521static inline void quota_send_warning(struct kqid qid, dev_t dev,
 522                                      const char warntype)
 523{
 524        return;
 525}
 526#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
 527
 528struct quota_info {
 529        unsigned int flags;                     /* Flags for diskquotas on this device */
 530        struct rw_semaphore dqio_sem;           /* Lock quota file while I/O in progress */
 531        struct inode *files[MAXQUOTAS];         /* inodes of quotafiles */
 532        struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */
 533        const struct quota_format_ops *ops[MAXQUOTAS];  /* Operations for each type */
 534};
 535
 536int register_quota_format(struct quota_format_type *fmt);
 537void unregister_quota_format(struct quota_format_type *fmt);
 538
 539struct quota_module_name {
 540        int qm_fmt_id;
 541        char *qm_mod_name;
 542};
 543
 544#define INIT_QUOTA_MODULE_NAMES {\
 545        {QFMT_VFS_OLD, "quota_v1"},\
 546        {QFMT_VFS_V0, "quota_v2"},\
 547        {QFMT_VFS_V1, "quota_v2"},\
 548        {0, NULL}}
 549
 550#endif /* _QUOTA_ */
 551