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Annotation of 43BSD/sys/h/inode.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)inode.h     7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * The I node is the focus of all file activity in UNIX.
        !            11:  * There is a unique inode allocated for each active file,
        !            12:  * each current directory, each mounted-on file, text file, and the root.
        !            13:  * An inode is 'named' by its dev/inumber pair. (iget/iget.c)
        !            14:  * Data in icommon is read in from permanent inode on volume.
        !            15:  */
        !            16: 
        !            17: #define        NDADDR  12              /* direct addresses in inode */
        !            18: #define        NIADDR  3               /* indirect addresses in inode */
        !            19: 
        !            20: struct inode {
        !            21:        struct  inode *i_chain[2];      /* must be first */
        !            22:        u_short i_flag;
        !            23:        u_short i_count;        /* reference count */
        !            24:        dev_t   i_dev;          /* device where inode resides */
        !            25:        u_short i_shlockc;      /* count of shared locks on inode */
        !            26:        u_short i_exlockc;      /* count of exclusive locks on inode */
        !            27:        ino_t   i_number;       /* i number, 1-to-1 with device address */
        !            28:        long    i_id;           /* unique identifier */
        !            29:        struct  fs *i_fs;       /* file sys associated with this inode */
        !            30:        struct  dquot *i_dquot; /* quota structure controlling this file */
        !            31:        struct  text *i_text;   /* text entry, if any (should be region) */
        !            32:        union {
        !            33:                daddr_t if_lastr;       /* last read (read-ahead) */
        !            34:                struct  socket *is_socket;
        !            35:                struct  {
        !            36:                        struct inode  *if_freef;        /* free list forward */
        !            37:                        struct inode **if_freeb;        /* free list back */
        !            38:                } i_fr;
        !            39:        } i_un;
        !            40:        struct  icommon
        !            41:        {
        !            42:                u_short ic_mode;        /*  0: mode and type of file */
        !            43:                short   ic_nlink;       /*  2: number of links to file */
        !            44:                uid_t   ic_uid;         /*  4: owner's user id */
        !            45:                gid_t   ic_gid;         /*  6: owner's group id */
        !            46:                quad    ic_size;        /*  8: number of bytes in file */
        !            47:                time_t  ic_atime;       /* 16: time last accessed */
        !            48:                long    ic_atspare;
        !            49:                time_t  ic_mtime;       /* 24: time last modified */
        !            50:                long    ic_mtspare;
        !            51:                time_t  ic_ctime;       /* 32: last time inode changed */
        !            52:                long    ic_ctspare;
        !            53:                daddr_t ic_db[NDADDR];  /* 40: disk block addresses */
        !            54:                daddr_t ic_ib[NIADDR];  /* 88: indirect blocks */
        !            55:                long    ic_flags;       /* 100: status, currently unused */
        !            56:                long    ic_blocks;      /* 104: blocks actually held */
        !            57:                long    ic_spare[5];    /* 108: reserved, currently unused */
        !            58:        } i_ic;
        !            59: };
        !            60: 
        !            61: struct dinode {
        !            62:        union {
        !            63:                struct  icommon di_icom;
        !            64:                char    di_size[128];
        !            65:        } di_un;
        !            66: };
        !            67: 
        !            68: #define        i_mode          i_ic.ic_mode
        !            69: #define        i_nlink         i_ic.ic_nlink
        !            70: #define        i_uid           i_ic.ic_uid
        !            71: #define        i_gid           i_ic.ic_gid
        !            72: /* ugh! -- must be fixed */
        !            73: #ifdef vax
        !            74: #define        i_size          i_ic.ic_size.val[0]
        !            75: #endif
        !            76: #define        i_db            i_ic.ic_db
        !            77: #define        i_ib            i_ic.ic_ib
        !            78: #define        i_atime         i_ic.ic_atime
        !            79: #define        i_mtime         i_ic.ic_mtime
        !            80: #define        i_ctime         i_ic.ic_ctime
        !            81: #define i_blocks       i_ic.ic_blocks
        !            82: #define        i_rdev          i_ic.ic_db[0]
        !            83: #define        i_lastr         i_un.if_lastr
        !            84: #define        i_socket        i_un.is_socket
        !            85: #define        i_forw          i_chain[0]
        !            86: #define        i_back          i_chain[1]
        !            87: #define        i_freef         i_un.i_fr.if_freef
        !            88: #define        i_freeb         i_un.i_fr.if_freeb
        !            89: 
        !            90: #define di_ic          di_un.di_icom
        !            91: #define        di_mode         di_ic.ic_mode
        !            92: #define        di_nlink        di_ic.ic_nlink
        !            93: #define        di_uid          di_ic.ic_uid
        !            94: #define        di_gid          di_ic.ic_gid
        !            95: #ifdef vax
        !            96: #define        di_size         di_ic.ic_size.val[0]
        !            97: #endif
        !            98: #define        di_db           di_ic.ic_db
        !            99: #define        di_ib           di_ic.ic_ib
        !           100: #define        di_atime        di_ic.ic_atime
        !           101: #define        di_mtime        di_ic.ic_mtime
        !           102: #define        di_ctime        di_ic.ic_ctime
        !           103: #define        di_rdev         di_ic.ic_db[0]
        !           104: #define        di_blocks       di_ic.ic_blocks
        !           105: 
        !           106: #ifdef KERNEL
        !           107: /*
        !           108:  * Invalidate an inode. Used by the namei cache to detect stale
        !           109:  * information. At an absurd rate of 100 calls/second, the inode
        !           110:  * table invalidation should only occur once every 16 months.
        !           111:  */
        !           112: #define cacheinval(ip) \
        !           113:        (ip)->i_id = ++nextinodeid; \
        !           114:        if (nextinodeid == 0) \
        !           115:                cacheinvalall();
        !           116: 
        !           117: struct inode *inode;           /* the inode table itself */
        !           118: struct inode *inodeNINODE;     /* the end of the inode table */
        !           119: int    ninode;                 /* number of slots in the table */
        !           120: long   nextinodeid;            /* unique id generator */
        !           121: 
        !           122: struct inode *rootdir;                 /* pointer to inode of root directory */
        !           123: 
        !           124: struct inode *ialloc();
        !           125: struct inode *iget();
        !           126: #ifdef notdef
        !           127: struct inode *ifind();
        !           128: #endif
        !           129: struct inode *owner();
        !           130: struct inode *maknode();
        !           131: struct inode *namei();
        !           132: 
        !           133: ino_t  dirpref();
        !           134: #endif
        !           135: 
        !           136: /* flags */
        !           137: #define        ILOCKED         0x1             /* inode is locked */
        !           138: #define        IUPD            0x2             /* file has been modified */
        !           139: #define        IACC            0x4             /* inode access time to be updated */
        !           140: #define        IMOUNT          0x8             /* inode is mounted on */
        !           141: #define        IWANT           0x10            /* some process waiting on lock */
        !           142: #define        ITEXT           0x20            /* inode is pure text prototype */
        !           143: #define        ICHG            0x40            /* inode has been changed */
        !           144: #define        ISHLOCK         0x80            /* file has shared lock */
        !           145: #define        IEXLOCK         0x100           /* file has exclusive lock */
        !           146: #define        ILWAIT          0x200           /* someone waiting on file lock */
        !           147: #define        IMOD            0x400           /* inode has been modified */
        !           148: #define        IRENAME         0x800           /* inode is being renamed */
        !           149: 
        !           150: /* modes */
        !           151: #define        IFMT            0170000         /* type of file */
        !           152: #define        IFCHR           0020000         /* character special */
        !           153: #define        IFDIR           0040000         /* directory */
        !           154: #define        IFBLK           0060000         /* block special */
        !           155: #define        IFREG           0100000         /* regular */
        !           156: #define        IFLNK           0120000         /* symbolic link */
        !           157: #define        IFSOCK          0140000         /* socket */
        !           158: 
        !           159: #define        ISUID           04000           /* set user id on execution */
        !           160: #define        ISGID           02000           /* set group id on execution */
        !           161: #define        ISVTX           01000           /* save swapped text even after use */
        !           162: #define        IREAD           0400            /* read, write, execute permissions */
        !           163: #define        IWRITE          0200
        !           164: #define        IEXEC           0100
        !           165: 
        !           166: #define        ILOCK(ip) { \
        !           167:        while ((ip)->i_flag & ILOCKED) { \
        !           168:                (ip)->i_flag |= IWANT; \
        !           169:                sleep((caddr_t)(ip), PINOD); \
        !           170:        } \
        !           171:        (ip)->i_flag |= ILOCKED; \
        !           172: }
        !           173: 
        !           174: #define        IUNLOCK(ip) { \
        !           175:        (ip)->i_flag &= ~ILOCKED; \
        !           176:        if ((ip)->i_flag&IWANT) { \
        !           177:                (ip)->i_flag &= ~IWANT; \
        !           178:                wakeup((caddr_t)(ip)); \
        !           179:        } \
        !           180: }
        !           181: 
        !           182: #define        IUPDAT(ip, t1, t2, waitfor) { \
        !           183:        if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) \
        !           184:                iupdat(ip, t1, t2, waitfor); \
        !           185: }
        !           186: 
        !           187: #define        ITIMES(ip, t1, t2) { \
        !           188:        if ((ip)->i_flag&(IUPD|IACC|ICHG)) { \
        !           189:                (ip)->i_flag |= IMOD; \
        !           190:                if ((ip)->i_flag&IACC) \
        !           191:                        (ip)->i_atime = (t1)->tv_sec; \
        !           192:                if ((ip)->i_flag&IUPD) \
        !           193:                        (ip)->i_mtime = (t2)->tv_sec; \
        !           194:                if ((ip)->i_flag&ICHG) \
        !           195:                        (ip)->i_ctime = time.tv_sec; \
        !           196:                (ip)->i_flag &= ~(IACC|IUPD|ICHG); \
        !           197:        } \
        !           198: }

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