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0001 /*
0002  * Copyright (c) 1982, 1986 Regents of the University of California.
0003  * All rights reserved.
0004  *
0005  * This code is derived from software contributed to Berkeley by
0006  * Robert Elz at The University of Melbourne.
0007  *
0008  * Redistribution and use in source and binary forms, with or without
0009  * modification, are permitted provided that the following conditions
0010  * are met:
0011  * 1. Redistributions of source code must retain the above copyright
0012  *    notice, this list of conditions and the following disclaimer.
0013  * 2. Redistributions in binary form must reproduce the above copyright
0014  *    notice, this list of conditions and the following disclaimer in the
0015  *    documentation and/or other materials provided with the distribution.
0016  * 3. Neither the name of the University nor the names of its contributors
0017  *    may be used to endorse or promote products derived from this software
0018  *    without specific prior written permission.
0019  *
0020  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
0021  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0022  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0023  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
0024  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
0025  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
0026  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
0027  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
0028  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
0029  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
0030  * SUCH DAMAGE.
0031  */
0032 #ifndef _LINUX_QUOTA_
0033 #define _LINUX_QUOTA_
0034 
0035 #include <linux/list.h>
0036 #include <linux/mutex.h>
0037 #include <linux/rwsem.h>
0038 #include <linux/spinlock.h>
0039 #include <linux/wait.h>
0040 #include <linux/percpu_counter.h>
0041 
0042 #include <linux/dqblk_xfs.h>
0043 #include <linux/dqblk_v1.h>
0044 #include <linux/dqblk_v2.h>
0045 
0046 #include <linux/atomic.h>
0047 #include <linux/uidgid.h>
0048 #include <linux/projid.h>
0049 #include <uapi/linux/quota.h>
0050 
0051 #undef USRQUOTA
0052 #undef GRPQUOTA
0053 #undef PRJQUOTA
0054 enum quota_type {
0055     USRQUOTA = 0,       /* element used for user quotas */
0056     GRPQUOTA = 1,       /* element used for group quotas */
0057     PRJQUOTA = 2,       /* element used for project quotas */
0058 };
0059 
0060 /* Masks for quota types when used as a bitmask */
0061 #define QTYPE_MASK_USR (1 << USRQUOTA)
0062 #define QTYPE_MASK_GRP (1 << GRPQUOTA)
0063 #define QTYPE_MASK_PRJ (1 << PRJQUOTA)
0064 
0065 typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
0066 typedef long long qsize_t;  /* Type in which we store sizes */
0067 
0068 struct kqid {           /* Type in which we store the quota identifier */
0069     union {
0070         kuid_t uid;
0071         kgid_t gid;
0072         kprojid_t projid;
0073     };
0074     enum quota_type type;  /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
0075 };
0076 
0077 extern bool qid_eq(struct kqid left, struct kqid right);
0078 extern bool qid_lt(struct kqid left, struct kqid right);
0079 extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
0080 extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
0081 extern bool qid_valid(struct kqid qid);
0082 
0083 /**
0084  *  make_kqid - Map a user-namespace, type, qid tuple into a kqid.
0085  *  @from: User namespace that the qid is in
0086  *  @type: The type of quota
0087  *  @qid: Quota identifier
0088  *
0089  *  Maps a user-namespace, type qid tuple into a kernel internal
0090  *  kqid, and returns that kqid.
0091  *
0092  *  When there is no mapping defined for the user-namespace, type,
0093  *  qid tuple an invalid kqid is returned.  Callers are expected to
0094  *  test for and handle invalid kqids being returned.
0095  *  Invalid kqids may be tested for using qid_valid().
0096  */
0097 static inline struct kqid make_kqid(struct user_namespace *from,
0098                     enum quota_type type, qid_t qid)
0099 {
0100     struct kqid kqid;
0101 
0102     kqid.type = type;
0103     switch (type) {
0104     case USRQUOTA:
0105         kqid.uid = make_kuid(from, qid);
0106         break;
0107     case GRPQUOTA:
0108         kqid.gid = make_kgid(from, qid);
0109         break;
0110     case PRJQUOTA:
0111         kqid.projid = make_kprojid(from, qid);
0112         break;
0113     default:
0114         BUG();
0115     }
0116     return kqid;
0117 }
0118 
0119 /**
0120  *  make_kqid_invalid - Explicitly make an invalid kqid
0121  *  @type: The type of quota identifier
0122  *
0123  *  Returns an invalid kqid with the specified type.
0124  */
0125 static inline struct kqid make_kqid_invalid(enum quota_type type)
0126 {
0127     struct kqid kqid;
0128 
0129     kqid.type = type;
0130     switch (type) {
0131     case USRQUOTA:
0132         kqid.uid = INVALID_UID;
0133         break;
0134     case GRPQUOTA:
0135         kqid.gid = INVALID_GID;
0136         break;
0137     case PRJQUOTA:
0138         kqid.projid = INVALID_PROJID;
0139         break;
0140     default:
0141         BUG();
0142     }
0143     return kqid;
0144 }
0145 
0146 /**
0147  *  make_kqid_uid - Make a kqid from a kuid
0148  *  @uid: The kuid to make the quota identifier from
0149  */
0150 static inline struct kqid make_kqid_uid(kuid_t uid)
0151 {
0152     struct kqid kqid;
0153     kqid.type = USRQUOTA;
0154     kqid.uid = uid;
0155     return kqid;
0156 }
0157 
0158 /**
0159  *  make_kqid_gid - Make a kqid from a kgid
0160  *  @gid: The kgid to make the quota identifier from
0161  */
0162 static inline struct kqid make_kqid_gid(kgid_t gid)
0163 {
0164     struct kqid kqid;
0165     kqid.type = GRPQUOTA;
0166     kqid.gid = gid;
0167     return kqid;
0168 }
0169 
0170 /**
0171  *  make_kqid_projid - Make a kqid from a projid
0172  *  @projid: The kprojid to make the quota identifier from
0173  */
0174 static inline struct kqid make_kqid_projid(kprojid_t projid)
0175 {
0176     struct kqid kqid;
0177     kqid.type = PRJQUOTA;
0178     kqid.projid = projid;
0179     return kqid;
0180 }
0181 
0182 /**
0183  *  qid_has_mapping - Report if a qid maps into a user namespace.
0184  *  @ns:  The user namespace to see if a value maps into.
0185  *  @qid: The kernel internal quota identifier to test.
0186  */
0187 static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
0188 {
0189     return from_kqid(ns, qid) != (qid_t) -1;
0190 }
0191 
0192 
0193 extern spinlock_t dq_data_lock;
0194 
0195 /* Maximal numbers of writes for quota operation (insert/delete/update)
0196  * (over VFS all formats) */
0197 #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
0198 #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
0199 #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
0200 #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
0201 
0202 /*
0203  * Data for one user/group kept in memory
0204  */
0205 struct mem_dqblk {
0206     qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
0207     qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
0208     qsize_t dqb_curspace;   /* current used space */
0209     qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
0210     qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
0211     qsize_t dqb_isoftlimit; /* preferred inode limit */
0212     qsize_t dqb_curinodes;  /* current # allocated inodes */
0213     time64_t dqb_btime; /* time limit for excessive disk use */
0214     time64_t dqb_itime; /* time limit for excessive inode use */
0215 };
0216 
0217 /*
0218  * Data for one quotafile kept in memory
0219  */
0220 struct quota_format_type;
0221 
0222 struct mem_dqinfo {
0223     struct quota_format_type *dqi_format;
0224     int dqi_fmt_id;     /* Id of the dqi_format - used when turning
0225                  * quotas on after remount RW */
0226     struct list_head dqi_dirty_list;    /* List of dirty dquots [dq_list_lock] */
0227     unsigned long dqi_flags;    /* DFQ_ flags [dq_data_lock] */
0228     unsigned int dqi_bgrace;    /* Space grace time [dq_data_lock] */
0229     unsigned int dqi_igrace;    /* Inode grace time [dq_data_lock] */
0230     qsize_t dqi_max_spc_limit;  /* Maximum space limit [static] */
0231     qsize_t dqi_max_ino_limit;  /* Maximum inode limit [static] */
0232     void *dqi_priv;
0233 };
0234 
0235 struct super_block;
0236 
0237 /* Mask for flags passed to userspace */
0238 #define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE)
0239 /* Mask for flags modifiable from userspace */
0240 #define DQF_SETINFO_MASK DQF_ROOT_SQUASH
0241 
0242 enum {
0243     DQF_INFO_DIRTY_B = DQF_PRIVATE,
0244 };
0245 #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)  /* Is info dirty? */
0246 
0247 extern void mark_info_dirty(struct super_block *sb, int type);
0248 static inline int info_dirty(struct mem_dqinfo *info)
0249 {
0250     return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
0251 }
0252 
0253 enum {
0254     DQST_LOOKUPS,
0255     DQST_DROPS,
0256     DQST_READS,
0257     DQST_WRITES,
0258     DQST_CACHE_HITS,
0259     DQST_ALLOC_DQUOTS,
0260     DQST_FREE_DQUOTS,
0261     DQST_SYNCS,
0262     _DQST_DQSTAT_LAST
0263 };
0264 
0265 struct dqstats {
0266     unsigned long stat[_DQST_DQSTAT_LAST];
0267     struct percpu_counter counter[_DQST_DQSTAT_LAST];
0268 };
0269 
0270 extern struct dqstats dqstats;
0271 
0272 static inline void dqstats_inc(unsigned int type)
0273 {
0274     percpu_counter_inc(&dqstats.counter[type]);
0275 }
0276 
0277 static inline void dqstats_dec(unsigned int type)
0278 {
0279     percpu_counter_dec(&dqstats.counter[type]);
0280 }
0281 
0282 #define DQ_MOD_B    0   /* dquot modified since read */
0283 #define DQ_BLKS_B   1   /* uid/gid has been warned about blk limit */
0284 #define DQ_INODES_B 2   /* uid/gid has been warned about inode limit */
0285 #define DQ_FAKE_B   3   /* no limits only usage */
0286 #define DQ_READ_B   4   /* dquot was read into memory */
0287 #define DQ_ACTIVE_B 5   /* dquot is active (dquot_release not called) */
0288 #define DQ_LASTSET_B    6   /* Following 6 bits (see QIF_) are reserved\
0289                  * for the mask of entries set via SETQUOTA\
0290                  * quotactl. They are set under dq_data_lock\
0291                  * and the quota format handling dquot can\
0292                  * clear them when it sees fit. */
0293 
0294 struct dquot {
0295     struct hlist_node dq_hash;  /* Hash list in memory [dq_list_lock] */
0296     struct list_head dq_inuse;  /* List of all quotas [dq_list_lock] */
0297     struct list_head dq_free;   /* Free list element [dq_list_lock] */
0298     struct list_head dq_dirty;  /* List of dirty dquots [dq_list_lock] */
0299     struct mutex dq_lock;       /* dquot IO lock */
0300     spinlock_t dq_dqb_lock;     /* Lock protecting dq_dqb changes */
0301     atomic_t dq_count;      /* Use count */
0302     struct super_block *dq_sb;  /* superblock this applies to */
0303     struct kqid dq_id;      /* ID this applies to (uid, gid, projid) */
0304     loff_t dq_off;          /* Offset of dquot on disk [dq_lock, stable once set] */
0305     unsigned long dq_flags;     /* See DQ_* */
0306     struct mem_dqblk dq_dqb;    /* Diskquota usage [dq_dqb_lock] */
0307 };
0308 
0309 /* Operations which must be implemented by each quota format */
0310 struct quota_format_ops {
0311     int (*check_quota_file)(struct super_block *sb, int type);  /* Detect whether file is in our format */
0312     int (*read_file_info)(struct super_block *sb, int type);    /* Read main info about file - called on quotaon() */
0313     int (*write_file_info)(struct super_block *sb, int type);   /* Write main info about file */
0314     int (*free_file_info)(struct super_block *sb, int type);    /* Called on quotaoff() */
0315     int (*read_dqblk)(struct dquot *dquot);     /* Read structure for one user */
0316     int (*commit_dqblk)(struct dquot *dquot);   /* Write structure for one user */
0317     int (*release_dqblk)(struct dquot *dquot);  /* Called when last reference to dquot is being dropped */
0318     int (*get_next_id)(struct super_block *sb, struct kqid *qid);   /* Get next ID with existing structure in the quota file */
0319 };
0320 
0321 /* Operations working with dquots */
0322 struct dquot_operations {
0323     int (*write_dquot) (struct dquot *);        /* Ordinary dquot write */
0324     struct dquot *(*alloc_dquot)(struct super_block *, int);    /* Allocate memory for new dquot */
0325     void (*destroy_dquot)(struct dquot *);      /* Free memory for dquot */
0326     int (*acquire_dquot) (struct dquot *);      /* Quota is going to be created on disk */
0327     int (*release_dquot) (struct dquot *);      /* Quota is going to be deleted from disk */
0328     int (*mark_dirty) (struct dquot *);     /* Dquot is marked dirty */
0329     int (*write_info) (struct super_block *, int);  /* Write of quota "superblock" */
0330     /* get reserved quota for delayed alloc, value returned is managed by
0331      * quota code only */
0332     qsize_t *(*get_reserved_space) (struct inode *);
0333     int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
0334     /* Get number of inodes that were charged for a given inode */
0335     int (*get_inode_usage) (struct inode *, qsize_t *);
0336     /* Get next ID with active quota structure */
0337     int (*get_next_id) (struct super_block *sb, struct kqid *qid);
0338 };
0339 
0340 struct path;
0341 
0342 /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
0343 struct qc_dqblk {
0344     int d_fieldmask;    /* mask of fields to change in ->set_dqblk() */
0345     u64 d_spc_hardlimit;    /* absolute limit on used space */
0346     u64 d_spc_softlimit;    /* preferred limit on used space */
0347     u64 d_ino_hardlimit;    /* maximum # allocated inodes */
0348     u64 d_ino_softlimit;    /* preferred inode limit */
0349     u64 d_space;        /* Space owned by the user */
0350     u64 d_ino_count;    /* # inodes owned by the user */
0351     s64 d_ino_timer;    /* zero if within inode limits */
0352                 /* if not, we refuse service */
0353     s64 d_spc_timer;    /* similar to above; for space */
0354     int d_ino_warns;    /* # warnings issued wrt num inodes */
0355     int d_spc_warns;    /* # warnings issued wrt used space */
0356     u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */
0357     u64 d_rt_spc_softlimit; /* preferred limit on RT space */
0358     u64 d_rt_space;     /* realtime space owned */
0359     s64 d_rt_spc_timer; /* similar to above; for RT space */
0360     int d_rt_spc_warns; /* # warnings issued wrt RT space */
0361 };
0362 
0363 /*
0364  * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
0365  * ->set_info() in struct qc_info
0366  */
0367 #define QC_INO_SOFT (1<<0)
0368 #define QC_INO_HARD (1<<1)
0369 #define QC_SPC_SOFT (1<<2)
0370 #define QC_SPC_HARD (1<<3)
0371 #define QC_RT_SPC_SOFT  (1<<4)
0372 #define QC_RT_SPC_HARD  (1<<5)
0373 #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
0374                QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
0375 #define QC_SPC_TIMER    (1<<6)
0376 #define QC_INO_TIMER    (1<<7)
0377 #define QC_RT_SPC_TIMER (1<<8)
0378 #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
0379 #define QC_SPC_WARNS    (1<<9)
0380 #define QC_INO_WARNS    (1<<10)
0381 #define QC_RT_SPC_WARNS (1<<11)
0382 #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
0383 #define QC_SPACE    (1<<12)
0384 #define QC_INO_COUNT    (1<<13)
0385 #define QC_RT_SPACE (1<<14)
0386 #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
0387 #define QC_FLAGS    (1<<15)
0388 
0389 #define QCI_SYSFILE     (1 << 0)    /* Quota file is hidden from userspace */
0390 #define QCI_ROOT_SQUASH     (1 << 1)    /* Root squash turned on */
0391 #define QCI_ACCT_ENABLED    (1 << 2)    /* Quota accounting enabled */
0392 #define QCI_LIMITS_ENFORCED (1 << 3)    /* Quota limits enforced */
0393 
0394 /* Structures for communicating via ->get_state */
0395 struct qc_type_state {
0396     unsigned int flags;     /* Flags QCI_* */
0397     unsigned int spc_timelimit; /* Time after which space softlimit is
0398                      * enforced */
0399     unsigned int ino_timelimit; /* Ditto for inode softlimit */
0400     unsigned int rt_spc_timelimit;  /* Ditto for real-time space */
0401     unsigned int spc_warnlimit; /* Limit for number of space warnings */
0402     unsigned int ino_warnlimit; /* Ditto for inodes */
0403     unsigned int rt_spc_warnlimit;  /* Ditto for real-time space */
0404     unsigned long long ino;     /* Inode number of quota file */
0405     blkcnt_t blocks;        /* Number of 512-byte blocks in the file */
0406     blkcnt_t nextents;      /* Number of extents in the file */
0407 };
0408 
0409 struct qc_state {
0410     unsigned int s_incoredqs;   /* Number of dquots in core */
0411     struct qc_type_state s_state[MAXQUOTAS];  /* Per quota type information */
0412 };
0413 
0414 /* Structure for communicating via ->set_info */
0415 struct qc_info {
0416     int i_fieldmask;    /* mask of fields to change in ->set_info() */
0417     unsigned int i_flags;       /* Flags QCI_* */
0418     unsigned int i_spc_timelimit;   /* Time after which space softlimit is
0419                      * enforced */
0420     unsigned int i_ino_timelimit;   /* Ditto for inode softlimit */
0421     unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
0422     unsigned int i_spc_warnlimit;   /* Limit for number of space warnings */
0423     unsigned int i_ino_warnlimit;   /* Limit for number of inode warnings */
0424     unsigned int i_rt_spc_warnlimit;    /* Ditto for real-time space */
0425 };
0426 
0427 /* Operations handling requests from userspace */
0428 struct quotactl_ops {
0429     int (*quota_on)(struct super_block *, int, int, const struct path *);
0430     int (*quota_off)(struct super_block *, int);
0431     int (*quota_enable)(struct super_block *, unsigned int);
0432     int (*quota_disable)(struct super_block *, unsigned int);
0433     int (*quota_sync)(struct super_block *, int);
0434     int (*set_info)(struct super_block *, int, struct qc_info *);
0435     int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
0436     int (*get_nextdqblk)(struct super_block *, struct kqid *,
0437                  struct qc_dqblk *);
0438     int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
0439     int (*get_state)(struct super_block *, struct qc_state *);
0440     int (*rm_xquota)(struct super_block *, unsigned int);
0441 };
0442 
0443 struct quota_format_type {
0444     int qf_fmt_id;  /* Quota format id */
0445     const struct quota_format_ops *qf_ops;  /* Operations of format */
0446     struct module *qf_owner;        /* Module implementing quota format */
0447     struct quota_format_type *qf_next;
0448 };
0449 
0450 /**
0451  * Quota state flags - they come in three flavors - for users, groups and projects.
0452  *
0453  * Actual typed flags layout:
0454  *              USRQUOTA    GRPQUOTA    PRJQUOTA
0455  *  DQUOT_USAGE_ENABLED     0x0001      0x0002      0x0004
0456  *  DQUOT_LIMITS_ENABLED    0x0008      0x0010      0x0020
0457  *  DQUOT_SUSPENDED     0x0040      0x0080      0x0100
0458  *
0459  * Following bits are used for non-typed flags:
0460  *  DQUOT_QUOTA_SYS_FILE    0x0200
0461  *  DQUOT_NEGATIVE_USAGE    0x0400
0462  *  DQUOT_NOLIST_DIRTY      0x0800
0463  */
0464 enum {
0465     _DQUOT_USAGE_ENABLED = 0,       /* Track disk usage for users */
0466     _DQUOT_LIMITS_ENABLED,          /* Enforce quota limits for users */
0467     _DQUOT_SUSPENDED,           /* User diskquotas are off, but
0468                          * we have necessary info in
0469                          * memory to turn them on */
0470     _DQUOT_STATE_FLAGS
0471 };
0472 #define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
0473 #define DQUOT_LIMITS_ENABLED    (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
0474 #define DQUOT_SUSPENDED     (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
0475 #define DQUOT_STATE_FLAGS   (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
0476                  DQUOT_SUSPENDED)
0477 /* Other quota flags */
0478 #define DQUOT_STATE_LAST    (_DQUOT_STATE_FLAGS * MAXQUOTAS)
0479 #define DQUOT_QUOTA_SYS_FILE    (1 << DQUOT_STATE_LAST)
0480                         /* Quota file is a special
0481                          * system file and user cannot
0482                          * touch it. Filesystem is
0483                          * responsible for setting
0484                          * S_NOQUOTA, S_NOATIME flags
0485                          */
0486 #define DQUOT_NEGATIVE_USAGE    (1 << (DQUOT_STATE_LAST + 1))
0487                            /* Allow negative quota usage */
0488 /* Do not track dirty dquots in a list */
0489 #define DQUOT_NOLIST_DIRTY  (1 << (DQUOT_STATE_LAST + 2))
0490 
0491 static inline unsigned int dquot_state_flag(unsigned int flags, int type)
0492 {
0493     return flags << type;
0494 }
0495 
0496 static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
0497 {
0498     return (flags >> type) & DQUOT_STATE_FLAGS;
0499 }
0500 
0501 /* Bitmap of quota types where flag is set in flags */
0502 static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
0503 {
0504     BUILD_BUG_ON_NOT_POWER_OF_2(flag);
0505     return (flags / flag) & ((1 << MAXQUOTAS) - 1);
0506 }
0507 
0508 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
0509 extern void quota_send_warning(struct kqid qid, dev_t dev,
0510                    const char warntype);
0511 #else
0512 static inline void quota_send_warning(struct kqid qid, dev_t dev,
0513                       const char warntype)
0514 {
0515     return;
0516 }
0517 #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
0518 
0519 struct quota_info {
0520     unsigned int flags;         /* Flags for diskquotas on this device */
0521     struct rw_semaphore dqio_sem;       /* Lock quota file while I/O in progress */
0522     struct inode *files[MAXQUOTAS];     /* inodes of quotafiles */
0523     struct mem_dqinfo info[MAXQUOTAS];  /* Information for each quota type */
0524     const struct quota_format_ops *ops[MAXQUOTAS];  /* Operations for each type */
0525 };
0526 
0527 int register_quota_format(struct quota_format_type *fmt);
0528 void unregister_quota_format(struct quota_format_type *fmt);
0529 
0530 struct quota_module_name {
0531     int qm_fmt_id;
0532     char *qm_mod_name;
0533 };
0534 
0535 #define INIT_QUOTA_MODULE_NAMES {\
0536     {QFMT_VFS_OLD, "quota_v1"},\
0537     {QFMT_VFS_V0, "quota_v2"},\
0538     {QFMT_VFS_V1, "quota_v2"},\
0539     {0, NULL}}
0540 
0541 #endif /* _QUOTA_ */
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