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Annotation of 42BSD/sys/h/quota.h, revision 1.1

1.1     ! root        1: /*     quota.h 6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * MELBOURNE DISC QUOTAS
        !             5:  *
        !             6:  * Various junk to do with various quotas (etc) imposed upon
        !             7:  * the average user (big brother finally hits UNIX).
        !             8:  *
        !             9:  * The following structure exists in core for each logged on user.
        !            10:  * It contains global junk relevant to that user's quotas.
        !            11:  *
        !            12:  * The u_quota field of each user struct contains a pointer to
        !            13:  * the quota struct relevant to the current process, this is changed
        !            14:  * by 'setuid' sys call, &/or by the Q_SETUID quota() call.
        !            15:  */
        !            16: struct quota {
        !            17:        struct  quota *q_forw, *q_back; /* hash chain, MUST be first */
        !            18:        short   q_cnt;                  /* ref count (# processes) */
        !            19:        short   q_uid;                  /* real uid of owner */
        !            20:        int     q_flags;                /* struct management flags */
        !            21: #define        Q_LOCK  0x01            /* quota struct locked (for disc i/o) */
        !            22: #define        Q_WANT  0x02            /* issue a wakeup when lock goes off */
        !            23: #define        Q_NEW   0x04            /* new quota - no proc1 msg sent yet */
        !            24: #define        Q_NDQ   0x08            /* account has NO disc quota */
        !            25:        struct  quota *q_freef, **q_freeb;
        !            26:        struct  dquot *q_dq[NMOUNT];    /* disc quotas for mounted filesys's */
        !            27: };
        !            28: 
        !            29: #define        NOQUOTA ((struct quota *) 0)
        !            30: 
        !            31: #if defined(KERNEL) && defined(QUOTA)
        !            32: struct quota *quota, *quotaNQUOTA;
        !            33: int    nquota;
        !            34: struct quota *getquota(), *qfind();
        !            35: #endif
        !            36: 
        !            37: /*
        !            38:  * The following structure defines the format of the disc quota file
        !            39:  * (as it appears on disc) - the file is an array of these structures
        !            40:  * indexed by user number.  The setquota sys call establishes the inode
        !            41:  * for each quota file (a pointer is retained in the mount structure).
        !            42:  *
        !            43:  * The following constants define the number of warnings given a user
        !            44:  * before the soft limits are treated as hard limits (usually resulting
        !            45:  * in an allocation failure).  The warnings are normally manipulated
        !            46:  * each time a user logs in through the Q_DOWARN quota call.  If
        !            47:  * the user logs in and is under the soft limit the warning count
        !            48:  * is reset to MAX_*_WARN, otherwise a message is printed and the
        !            49:  * warning count is decremented.  This makes MAX_*_WARN equivalent to
        !            50:  * the number of logins before soft limits are treated as hard limits.
        !            51:  */
        !            52: #define        MAX_IQ_WARN     3
        !            53: #define        MAX_DQ_WARN     3
        !            54: 
        !            55: struct dqblk {
        !            56:        u_long  dqb_bhardlimit; /* absolute limit on disc blks alloc */
        !            57:        u_long  dqb_bsoftlimit; /* preferred limit on disc blks */
        !            58:        u_long  dqb_curblocks;  /* current block count */
        !            59:        u_short dqb_ihardlimit; /* maximum # allocated inodes + 1 */
        !            60:        u_short dqb_isoftlimit; /* preferred inode limit */
        !            61:        u_short dqb_curinodes;  /* current # allocated inodes */
        !            62:        u_char  dqb_bwarn;      /* # warnings left about excessive disc use */
        !            63:        u_char  dqb_iwarn;      /* # warnings left about excessive inodes */
        !            64: };
        !            65: 
        !            66: /*
        !            67:  * The following structure records disc usage for a user on a filesystem.
        !            68:  * There is one allocated for each quota that exists on any filesystem
        !            69:  * for the current user. A cache is kept of other recently used entries.
        !            70:  */
        !            71: struct dquot {
        !            72:        struct  dquot *dq_forw, *dq_back;/* MUST be first entry */
        !            73:        union   {
        !            74:                struct  quota *Dq_own;  /* the quota that points to this */
        !            75:                struct {                /* free list */
        !            76:                        struct  dquot *Dq_freef, **Dq_freeb;
        !            77:                } dq_f;
        !            78:        } dq_u;
        !            79:        short   dq_flags;
        !            80: #define        DQ_LOCK         0x01            /* this quota locked (no MODS) */
        !            81: #define        DQ_WANT         0x02            /* wakeup on unlock */
        !            82: #define        DQ_MOD          0x04            /* this quota modified since read */
        !            83: #define        DQ_FAKE         0x08            /* no limits here, just usage */
        !            84: #define        DQ_BLKS         0x10            /* has been warned about blk limit */
        !            85: #define        DQ_INODS        0x20            /* has been warned about inode limit */
        !            86:        short   dq_cnt;                 /* count of active references */
        !            87:        short   dq_uid;                 /* user this applies to */
        !            88:        dev_t   dq_dev;                 /* filesystem this relates to */
        !            89:        struct dqblk dq_dqb;            /* actual usage & quotas */
        !            90: };
        !            91: 
        !            92: #define        dq_own          dq_u.Dq_own
        !            93: #define        dq_freef        dq_u.dq_f.Dq_freef
        !            94: #define        dq_freeb        dq_u.dq_f.Dq_freeb
        !            95: #define        dq_bhardlimit   dq_dqb.dqb_bhardlimit
        !            96: #define        dq_bsoftlimit   dq_dqb.dqb_bsoftlimit
        !            97: #define        dq_curblocks    dq_dqb.dqb_curblocks
        !            98: #define        dq_ihardlimit   dq_dqb.dqb_ihardlimit
        !            99: #define        dq_isoftlimit   dq_dqb.dqb_isoftlimit
        !           100: #define        dq_curinodes    dq_dqb.dqb_curinodes
        !           101: #define        dq_bwarn        dq_dqb.dqb_bwarn
        !           102: #define        dq_iwarn        dq_dqb.dqb_iwarn
        !           103: 
        !           104: #define        NODQUOT         ((struct dquot *) 0)
        !           105: #define        LOSTDQUOT       ((struct dquot *) 1)
        !           106: 
        !           107: #if defined(KERNEL) && defined(QUOTA)
        !           108: struct dquot *dquot, *dquotNDQUOT;
        !           109: int    ndquot;
        !           110: struct dquot *discquota(), *inoquota(), *dqalloc(), *dqp();
        !           111: #endif
        !           112: 
        !           113: /*
        !           114:  * Definitions for the 'quota' system call.
        !           115:  */
        !           116: #define        Q_SETDLIM       1       /* set disc limits & usage */
        !           117: #define        Q_GETDLIM       2       /* get disc limits & usage */
        !           118: #define        Q_SETDUSE       3       /* set disc usage only */
        !           119: #define        Q_SYNC          4       /* update disc copy of quota usages */
        !           120: #define        Q_SETUID        16      /* change proc to use quotas for uid */
        !           121: #define        Q_SETWARN       25      /* alter inode/block warning counts */
        !           122: #define        Q_DOWARN        26      /* warn user about excessive space/inodes */
        !           123: 
        !           124: /*
        !           125:  * Used in Q_SETDUSE.
        !           126:  */
        !           127: struct dqusage {
        !           128:        u_short du_curinodes;
        !           129:        u_long  du_curblocks;
        !           130: };
        !           131: 
        !           132: /*
        !           133:  * Used in Q_SETWARN.
        !           134:  */
        !           135: struct dqwarn {
        !           136:        u_char  dw_bwarn;
        !           137:        u_char  dw_iwarn;
        !           138: };

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